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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Reid Spencer5f016e22007-07-11 17:01:13 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This file implements semantic analysis for expressions.
11//
12//===----------------------------------------------------------------------===//
13
John McCall2d887082010-08-25 22:03:47 +000014#include "clang/Sema/SemaInternal.h"
Douglas Gregore737f502010-08-12 20:07:10 +000015#include "clang/Sema/Initialization.h"
16#include "clang/Sema/Lookup.h"
17#include "clang/Sema/AnalysisBasedWarnings.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000018#include "clang/AST/ASTContext.h"
Douglas Gregorcc8a5d52010-04-29 00:18:15 +000019#include "clang/AST/CXXInheritance.h"
Daniel Dunbarc4a1dea2008-08-11 05:35:13 +000020#include "clang/AST/DeclObjC.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000021#include "clang/AST/DeclTemplate.h"
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +000022#include "clang/AST/EvaluatedExprVisitor.h"
Douglas Gregor8ecdb652010-04-28 22:16:22 +000023#include "clang/AST/Expr.h"
Chris Lattner04421082008-04-08 04:40:51 +000024#include "clang/AST/ExprCXX.h"
Steve Narofff494b572008-05-29 21:12:08 +000025#include "clang/AST/ExprObjC.h"
Douglas Gregorb4eeaff2010-05-07 23:12:07 +000026#include "clang/AST/RecursiveASTVisitor.h"
Douglas Gregor8ecdb652010-04-28 22:16:22 +000027#include "clang/AST/TypeLoc.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000028#include "clang/Basic/PartialDiagnostic.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000029#include "clang/Basic/SourceManager.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000030#include "clang/Basic/TargetInfo.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000031#include "clang/Lex/LiteralSupport.h"
32#include "clang/Lex/Preprocessor.h"
John McCall19510852010-08-20 18:27:03 +000033#include "clang/Sema/DeclSpec.h"
34#include "clang/Sema/Designator.h"
35#include "clang/Sema/Scope.h"
John McCall781472f2010-08-25 08:40:02 +000036#include "clang/Sema/ScopeInfo.h"
John McCall19510852010-08-20 18:27:03 +000037#include "clang/Sema/ParsedTemplate.h"
John McCall7cd088e2010-08-24 07:21:54 +000038#include "clang/Sema/Template.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000039using namespace clang;
John McCall781472f2010-08-25 08:40:02 +000040using namespace sema;
Reid Spencer5f016e22007-07-11 17:01:13 +000041
David Chisnall0f436562009-08-17 16:35:33 +000042
Douglas Gregor48f3bb92009-02-18 21:56:37 +000043/// \brief Determine whether the use of this declaration is valid, and
44/// emit any corresponding diagnostics.
45///
46/// This routine diagnoses various problems with referencing
47/// declarations that can occur when using a declaration. For example,
48/// it might warn if a deprecated or unavailable declaration is being
49/// used, or produce an error (and return true) if a C++0x deleted
50/// function is being used.
51///
Chris Lattner52338262009-10-25 22:31:57 +000052/// If IgnoreDeprecated is set to true, this should not want about deprecated
53/// decls.
54///
Douglas Gregor48f3bb92009-02-18 21:56:37 +000055/// \returns true if there was an error (this declaration cannot be
56/// referenced), false otherwise.
Chris Lattner52338262009-10-25 22:31:57 +000057///
John McCall54abf7d2009-11-04 02:18:39 +000058bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) {
Douglas Gregor9b623632010-10-12 23:32:35 +000059 if (getLangOptions().CPlusPlus && isa<FunctionDecl>(D)) {
60 // If there were any diagnostics suppressed by template argument deduction,
61 // emit them now.
62 llvm::DenseMap<Decl *, llvm::SmallVector<PartialDiagnosticAt, 1> >::iterator
63 Pos = SuppressedDiagnostics.find(D->getCanonicalDecl());
64 if (Pos != SuppressedDiagnostics.end()) {
65 llvm::SmallVectorImpl<PartialDiagnosticAt> &Suppressed = Pos->second;
66 for (unsigned I = 0, N = Suppressed.size(); I != N; ++I)
67 Diag(Suppressed[I].first, Suppressed[I].second);
68
69 // Clear out the list of suppressed diagnostics, so that we don't emit
70 // them again for this specialization. However, we don't remove this
71 // entry from the table, because we want to avoid ever emitting these
72 // diagnostics again.
73 Suppressed.clear();
74 }
75 }
76
Chris Lattner76a642f2009-02-15 22:43:40 +000077 // See if the decl is deprecated.
Benjamin Kramerce2d1862010-10-09 15:49:00 +000078 if (const DeprecatedAttr *DA = D->getAttr<DeprecatedAttr>())
79 EmitDeprecationWarning(D, DA->getMessage(), Loc);
Chris Lattner76a642f2009-02-15 22:43:40 +000080
Chris Lattnerffb93682009-10-25 17:21:40 +000081 // See if the decl is unavailable
Fariborz Jahanianc784dc12010-10-06 23:12:32 +000082 if (const UnavailableAttr *UA = D->getAttr<UnavailableAttr>()) {
83 if (UA->getMessage().empty())
84 Diag(Loc, diag::err_unavailable) << D->getDeclName();
85 else
86 Diag(Loc, diag::err_unavailable_message)
Benjamin Kramerce2d1862010-10-09 15:49:00 +000087 << D->getDeclName() << UA->getMessage();
Chris Lattnerffb93682009-10-25 17:21:40 +000088 Diag(D->getLocation(), diag::note_unavailable_here) << 0;
89 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +000090
Douglas Gregor48f3bb92009-02-18 21:56:37 +000091 // See if this is a deleted function.
Douglas Gregor25d944a2009-02-24 04:26:15 +000092 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Douglas Gregor48f3bb92009-02-18 21:56:37 +000093 if (FD->isDeleted()) {
94 Diag(Loc, diag::err_deleted_function_use);
95 Diag(D->getLocation(), diag::note_unavailable_here) << true;
96 return true;
97 }
Douglas Gregor25d944a2009-02-24 04:26:15 +000098 }
Douglas Gregor48f3bb92009-02-18 21:56:37 +000099
Anders Carlsson2127ecc2010-10-22 23:37:08 +0000100 // Warn if this is used but marked unused.
101 if (D->hasAttr<UnusedAttr>())
102 Diag(Loc, diag::warn_used_but_marked_unused) << D->getDeclName();
103
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000104 return false;
Chris Lattner76a642f2009-02-15 22:43:40 +0000105}
106
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000107/// DiagnoseSentinelCalls - This routine checks on method dispatch calls
Mike Stump1eb44332009-09-09 15:08:12 +0000108/// (and other functions in future), which have been declared with sentinel
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000109/// attribute. It warns if call does not have the sentinel argument.
110///
111void Sema::DiagnoseSentinelCalls(NamedDecl *D, SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +0000112 Expr **Args, unsigned NumArgs) {
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +0000113 const SentinelAttr *attr = D->getAttr<SentinelAttr>();
Mike Stump1eb44332009-09-09 15:08:12 +0000114 if (!attr)
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000115 return;
Douglas Gregor92e986e2010-04-22 16:44:27 +0000116
117 // FIXME: In C++0x, if any of the arguments are parameter pack
118 // expansions, we can't check for the sentinel now.
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000119 int sentinelPos = attr->getSentinel();
120 int nullPos = attr->getNullPos();
Mike Stump1eb44332009-09-09 15:08:12 +0000121
Mike Stump390b4cc2009-05-16 07:39:55 +0000122 // FIXME. ObjCMethodDecl and FunctionDecl need be derived from the same common
123 // base class. Then we won't be needing two versions of the same code.
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000124 unsigned int i = 0;
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000125 bool warnNotEnoughArgs = false;
126 int isMethod = 0;
127 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
128 // skip over named parameters.
129 ObjCMethodDecl::param_iterator P, E = MD->param_end();
130 for (P = MD->param_begin(); (P != E && i < NumArgs); ++P) {
131 if (nullPos)
132 --nullPos;
133 else
134 ++i;
135 }
136 warnNotEnoughArgs = (P != E || i >= NumArgs);
137 isMethod = 1;
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000138 } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000139 // skip over named parameters.
140 ObjCMethodDecl::param_iterator P, E = FD->param_end();
141 for (P = FD->param_begin(); (P != E && i < NumArgs); ++P) {
142 if (nullPos)
143 --nullPos;
144 else
145 ++i;
146 }
147 warnNotEnoughArgs = (P != E || i >= NumArgs);
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000148 } else if (VarDecl *V = dyn_cast<VarDecl>(D)) {
Fariborz Jahaniandaf04152009-05-15 20:33:25 +0000149 // block or function pointer call.
150 QualType Ty = V->getType();
151 if (Ty->isBlockPointerType() || Ty->isFunctionPointerType()) {
Mike Stump1eb44332009-09-09 15:08:12 +0000152 const FunctionType *FT = Ty->isFunctionPointerType()
John McCall183700f2009-09-21 23:43:11 +0000153 ? Ty->getAs<PointerType>()->getPointeeType()->getAs<FunctionType>()
154 : Ty->getAs<BlockPointerType>()->getPointeeType()->getAs<FunctionType>();
Fariborz Jahaniandaf04152009-05-15 20:33:25 +0000155 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FT)) {
156 unsigned NumArgsInProto = Proto->getNumArgs();
157 unsigned k;
158 for (k = 0; (k != NumArgsInProto && i < NumArgs); k++) {
159 if (nullPos)
160 --nullPos;
161 else
162 ++i;
163 }
164 warnNotEnoughArgs = (k != NumArgsInProto || i >= NumArgs);
165 }
166 if (Ty->isBlockPointerType())
167 isMethod = 2;
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000168 } else
Fariborz Jahaniandaf04152009-05-15 20:33:25 +0000169 return;
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000170 } else
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000171 return;
172
173 if (warnNotEnoughArgs) {
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000174 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000175 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000176 return;
177 }
178 int sentinel = i;
179 while (sentinelPos > 0 && i < NumArgs-1) {
180 --sentinelPos;
181 ++i;
182 }
183 if (sentinelPos > 0) {
184 Diag(Loc, diag::warn_not_enough_argument) << D->getDeclName();
Fariborz Jahanian236673e2009-05-14 18:00:00 +0000185 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
Fariborz Jahanian88f1ba02009-05-13 23:20:50 +0000186 return;
187 }
188 while (i < NumArgs-1) {
189 ++i;
190 ++sentinel;
191 }
192 Expr *sentinelExpr = Args[sentinel];
John McCall8eb662e2010-05-06 23:53:00 +0000193 if (!sentinelExpr) return;
194 if (sentinelExpr->isTypeDependent()) return;
195 if (sentinelExpr->isValueDependent()) return;
Anders Carlsson343e6ff2010-11-05 15:21:33 +0000196
197 // nullptr_t is always treated as null.
198 if (sentinelExpr->getType()->isNullPtrType()) return;
199
Fariborz Jahanian9ccd7252010-07-14 16:37:51 +0000200 if (sentinelExpr->getType()->isAnyPointerType() &&
John McCall8eb662e2010-05-06 23:53:00 +0000201 sentinelExpr->IgnoreParenCasts()->isNullPointerConstant(Context,
202 Expr::NPC_ValueDependentIsNull))
203 return;
204
205 // Unfortunately, __null has type 'int'.
206 if (isa<GNUNullExpr>(sentinelExpr)) return;
207
208 Diag(Loc, diag::warn_missing_sentinel) << isMethod;
209 Diag(D->getLocation(), diag::note_sentinel_here) << isMethod;
Fariborz Jahanian5b530052009-05-13 18:09:35 +0000210}
211
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000212SourceRange Sema::getExprRange(ExprTy *E) const {
213 Expr *Ex = (Expr *)E;
214 return Ex? Ex->getSourceRange() : SourceRange();
215}
216
Chris Lattnere7a2e912008-07-25 21:10:04 +0000217//===----------------------------------------------------------------------===//
218// Standard Promotions and Conversions
219//===----------------------------------------------------------------------===//
220
Chris Lattnere7a2e912008-07-25 21:10:04 +0000221/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4).
222void Sema::DefaultFunctionArrayConversion(Expr *&E) {
223 QualType Ty = E->getType();
224 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type");
225
Chris Lattnere7a2e912008-07-25 21:10:04 +0000226 if (Ty->isFunctionType())
Mike Stump1eb44332009-09-09 15:08:12 +0000227 ImpCastExprToType(E, Context.getPointerType(Ty),
John McCall2de56d12010-08-25 11:45:40 +0000228 CK_FunctionToPointerDecay);
Chris Lattner67d33d82008-07-25 21:33:13 +0000229 else if (Ty->isArrayType()) {
230 // In C90 mode, arrays only promote to pointers if the array expression is
231 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has
232 // type 'array of type' is converted to an expression that has type 'pointer
233 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression
234 // that has type 'array of type' ...". The relevant change is "an lvalue"
235 // (C90) to "an expression" (C99).
Argyrios Kyrtzidisc39a3d72008-09-11 04:25:59 +0000236 //
237 // C++ 4.2p1:
238 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of
239 // T" can be converted to an rvalue of type "pointer to T".
240 //
John McCall7eb0a9e2010-11-24 05:12:34 +0000241 if (getLangOptions().C99 || getLangOptions().CPlusPlus || E->isLValue())
Anders Carlsson112a0a82009-08-07 23:48:20 +0000242 ImpCastExprToType(E, Context.getArrayDecayedType(Ty),
John McCall2de56d12010-08-25 11:45:40 +0000243 CK_ArrayToPointerDecay);
Chris Lattner67d33d82008-07-25 21:33:13 +0000244 }
Chris Lattnere7a2e912008-07-25 21:10:04 +0000245}
246
Douglas Gregora873dfc2010-02-03 00:27:59 +0000247void Sema::DefaultFunctionArrayLvalueConversion(Expr *&E) {
248 DefaultFunctionArrayConversion(E);
John McCall7e485792010-11-30 10:13:06 +0000249
250 // C++ [conv.lval]p1:
251 // A glvalue of a non-function, non-array type T can be
252 // converted to a prvalue.
253 if (E->isGLValue()) {
Douglas Gregora873dfc2010-02-03 00:27:59 +0000254 // C++ [conv.lval]p1:
John McCall7e485792010-11-30 10:13:06 +0000255 // [...] If T is a non-class type, the type of the prvalue is the
Douglas Gregora873dfc2010-02-03 00:27:59 +0000256 // cv-unqualified version of T. Otherwise, the type of the
John McCall7e485792010-11-30 10:13:06 +0000257 // rvalue is T.
Douglas Gregora873dfc2010-02-03 00:27:59 +0000258 //
259 // C99 6.3.2.1p2:
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +0000260 // If the lvalue has qualified type, the value has the unqualified
261 // version of the type of the lvalue; otherwise, the value has the
Douglas Gregora873dfc2010-02-03 00:27:59 +0000262 // type of the lvalue.
John McCall7e485792010-11-30 10:13:06 +0000263 QualType T = E->getType();
264 assert(!T.isNull() && "r-value conversion on typeless expression?");
265
266 if (T.hasQualifiers() && !T->isDependentType() &&
267 (!getLangOptions().CPlusPlus || !T->isRecordType()))
268 T = T.getUnqualifiedType();
269
270 ImpCastExprToType(E, T, CK_LValueToRValue);
Douglas Gregora873dfc2010-02-03 00:27:59 +0000271 }
272}
273
274
Chris Lattnere7a2e912008-07-25 21:10:04 +0000275/// UsualUnaryConversions - Performs various conversions that are common to most
Mike Stump1eb44332009-09-09 15:08:12 +0000276/// operators (C99 6.3). The conversions of array and function types are
Chris Lattnere7a2e912008-07-25 21:10:04 +0000277/// sometimes surpressed. For example, the array->pointer conversion doesn't
278/// apply if the array is an argument to the sizeof or address (&) operators.
279/// In these instances, this routine should *not* be called.
John McCall7e485792010-11-30 10:13:06 +0000280Expr *Sema::UsualUnaryConversions(Expr *&E) {
281 // First, convert to an r-value.
282 DefaultFunctionArrayLvalueConversion(E);
283
284 QualType Ty = E->getType();
Chris Lattnere7a2e912008-07-25 21:10:04 +0000285 assert(!Ty.isNull() && "UsualUnaryConversions - missing type");
John McCall7e485792010-11-30 10:13:06 +0000286
287 // Try to perform integral promotions if the object has a theoretically
288 // promotable type.
289 if (Ty->isIntegralOrUnscopedEnumerationType()) {
290 // C99 6.3.1.1p2:
291 //
292 // The following may be used in an expression wherever an int or
293 // unsigned int may be used:
294 // - an object or expression with an integer type whose integer
295 // conversion rank is less than or equal to the rank of int
296 // and unsigned int.
297 // - A bit-field of type _Bool, int, signed int, or unsigned int.
298 //
299 // If an int can represent all values of the original type, the
300 // value is converted to an int; otherwise, it is converted to an
301 // unsigned int. These are called the integer promotions. All
302 // other types are unchanged by the integer promotions.
303
304 QualType PTy = Context.isPromotableBitField(E);
305 if (!PTy.isNull()) {
306 ImpCastExprToType(E, PTy, CK_IntegralCast);
307 return E;
308 }
309 if (Ty->isPromotableIntegerType()) {
310 QualType PT = Context.getPromotedIntegerType(Ty);
311 ImpCastExprToType(E, PT, CK_IntegralCast);
312 return E;
313 }
Eli Friedman04e83572009-08-20 04:21:42 +0000314 }
315
John McCall7e485792010-11-30 10:13:06 +0000316 return E;
Chris Lattnere7a2e912008-07-25 21:10:04 +0000317}
318
Chris Lattner05faf172008-07-25 22:25:12 +0000319/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that
Mike Stump1eb44332009-09-09 15:08:12 +0000320/// do not have a prototype. Arguments that have type float are promoted to
Chris Lattner05faf172008-07-25 22:25:12 +0000321/// double. All other argument types are converted by UsualUnaryConversions().
322void Sema::DefaultArgumentPromotion(Expr *&Expr) {
323 QualType Ty = Expr->getType();
324 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type");
Mike Stump1eb44332009-09-09 15:08:12 +0000325
Chris Lattner05faf172008-07-25 22:25:12 +0000326 // If this is a 'float' (CVR qualified or typedef) promote to double.
Chris Lattner40378332010-05-16 04:01:30 +0000327 if (Ty->isSpecificBuiltinType(BuiltinType::Float))
328 return ImpCastExprToType(Expr, Context.DoubleTy,
John McCall2de56d12010-08-25 11:45:40 +0000329 CK_FloatingCast);
Mike Stump1eb44332009-09-09 15:08:12 +0000330
Chris Lattner05faf172008-07-25 22:25:12 +0000331 UsualUnaryConversions(Expr);
332}
333
Chris Lattner312531a2009-04-12 08:11:20 +0000334/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but
335/// will warn if the resulting type is not a POD type, and rejects ObjC
336/// interfaces passed by value. This returns true if the argument type is
337/// completely illegal.
Chris Lattner40378332010-05-16 04:01:30 +0000338bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT,
339 FunctionDecl *FDecl) {
Anders Carlssondce5e2c2009-01-16 16:48:51 +0000340 DefaultArgumentPromotion(Expr);
Mike Stump1eb44332009-09-09 15:08:12 +0000341
Chris Lattner40378332010-05-16 04:01:30 +0000342 // __builtin_va_start takes the second argument as a "varargs" argument, but
343 // it doesn't actually do anything with it. It doesn't need to be non-pod
344 // etc.
345 if (FDecl && FDecl->getBuiltinID() == Builtin::BI__builtin_va_start)
346 return false;
347
John McCallc12c5bb2010-05-15 11:32:37 +0000348 if (Expr->getType()->isObjCObjectType() &&
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +0000349 DiagRuntimeBehavior(Expr->getLocStart(),
350 PDiag(diag::err_cannot_pass_objc_interface_to_vararg)
351 << Expr->getType() << CT))
352 return true;
Douglas Gregor75b699a2009-12-12 07:25:49 +0000353
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +0000354 if (!Expr->getType()->isPODType() &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +0000355 DiagRuntimeBehavior(Expr->getLocStart(),
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +0000356 PDiag(diag::warn_cannot_pass_non_pod_arg_to_vararg)
357 << Expr->getType() << CT))
358 return true;
Chris Lattner312531a2009-04-12 08:11:20 +0000359
360 return false;
Anders Carlssondce5e2c2009-01-16 16:48:51 +0000361}
362
Chris Lattnere7a2e912008-07-25 21:10:04 +0000363/// UsualArithmeticConversions - Performs various conversions that are common to
364/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this
Mike Stump1eb44332009-09-09 15:08:12 +0000365/// routine returns the first non-arithmetic type found. The client is
Chris Lattnere7a2e912008-07-25 21:10:04 +0000366/// responsible for emitting appropriate error diagnostics.
367/// FIXME: verify the conversion rules for "complex int" are consistent with
368/// GCC.
369QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr,
370 bool isCompAssign) {
Eli Friedmanab3a8522009-03-28 01:22:36 +0000371 if (!isCompAssign)
Chris Lattnere7a2e912008-07-25 21:10:04 +0000372 UsualUnaryConversions(lhsExpr);
Eli Friedmanab3a8522009-03-28 01:22:36 +0000373
374 UsualUnaryConversions(rhsExpr);
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000375
Mike Stump1eb44332009-09-09 15:08:12 +0000376 // For conversion purposes, we ignore any qualifiers.
Chris Lattnere7a2e912008-07-25 21:10:04 +0000377 // For example, "const float" and "float" are equivalent.
Chris Lattnerb77792e2008-07-26 22:17:49 +0000378 QualType lhs =
379 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType();
Mike Stump1eb44332009-09-09 15:08:12 +0000380 QualType rhs =
Chris Lattnerb77792e2008-07-26 22:17:49 +0000381 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType();
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000382
383 // If both types are identical, no conversion is needed.
384 if (lhs == rhs)
385 return lhs;
386
387 // If either side is a non-arithmetic type (e.g. a pointer), we are done.
388 // The caller can deal with this (e.g. pointer + int).
389 if (!lhs->isArithmeticType() || !rhs->isArithmeticType())
390 return lhs;
391
John McCallcf33b242010-11-13 08:17:45 +0000392 // Apply unary and bitfield promotions to the LHS's type.
393 QualType lhs_unpromoted = lhs;
394 if (lhs->isPromotableIntegerType())
395 lhs = Context.getPromotedIntegerType(lhs);
Eli Friedman04e83572009-08-20 04:21:42 +0000396 QualType LHSBitfieldPromoteTy = Context.isPromotableBitField(lhsExpr);
Douglas Gregor2d833e32009-05-02 00:36:19 +0000397 if (!LHSBitfieldPromoteTy.isNull())
398 lhs = LHSBitfieldPromoteTy;
John McCallcf33b242010-11-13 08:17:45 +0000399 if (lhs != lhs_unpromoted && !isCompAssign)
400 ImpCastExprToType(lhsExpr, lhs, CK_IntegralCast);
Douglas Gregor2d833e32009-05-02 00:36:19 +0000401
John McCallcf33b242010-11-13 08:17:45 +0000402 // If both types are identical, no conversion is needed.
403 if (lhs == rhs)
404 return lhs;
405
406 // At this point, we have two different arithmetic types.
407
408 // Handle complex types first (C99 6.3.1.8p1).
409 bool LHSComplexFloat = lhs->isComplexType();
410 bool RHSComplexFloat = rhs->isComplexType();
411 if (LHSComplexFloat || RHSComplexFloat) {
412 // if we have an integer operand, the result is the complex type.
413
John McCall2bb5d002010-11-13 09:02:35 +0000414 if (!RHSComplexFloat && !rhs->isRealFloatingType()) {
415 if (rhs->isIntegerType()) {
416 QualType fp = cast<ComplexType>(lhs)->getElementType();
417 ImpCastExprToType(rhsExpr, fp, CK_IntegralToFloating);
418 ImpCastExprToType(rhsExpr, lhs, CK_FloatingRealToComplex);
419 } else {
420 assert(rhs->isComplexIntegerType());
John McCallf3ea8cf2010-11-14 08:17:51 +0000421 ImpCastExprToType(rhsExpr, lhs, CK_IntegralComplexToFloatingComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000422 }
John McCallcf33b242010-11-13 08:17:45 +0000423 return lhs;
424 }
425
John McCall2bb5d002010-11-13 09:02:35 +0000426 if (!LHSComplexFloat && !lhs->isRealFloatingType()) {
427 if (!isCompAssign) {
428 // int -> float -> _Complex float
429 if (lhs->isIntegerType()) {
430 QualType fp = cast<ComplexType>(rhs)->getElementType();
431 ImpCastExprToType(lhsExpr, fp, CK_IntegralToFloating);
432 ImpCastExprToType(lhsExpr, rhs, CK_FloatingRealToComplex);
433 } else {
434 assert(lhs->isComplexIntegerType());
John McCallf3ea8cf2010-11-14 08:17:51 +0000435 ImpCastExprToType(lhsExpr, rhs, CK_IntegralComplexToFloatingComplex);
John McCall2bb5d002010-11-13 09:02:35 +0000436 }
437 }
John McCallcf33b242010-11-13 08:17:45 +0000438 return rhs;
439 }
440
441 // This handles complex/complex, complex/float, or float/complex.
442 // When both operands are complex, the shorter operand is converted to the
443 // type of the longer, and that is the type of the result. This corresponds
444 // to what is done when combining two real floating-point operands.
445 // The fun begins when size promotion occur across type domains.
446 // From H&S 6.3.4: When one operand is complex and the other is a real
447 // floating-point type, the less precise type is converted, within it's
448 // real or complex domain, to the precision of the other type. For example,
449 // when combining a "long double" with a "double _Complex", the
450 // "double _Complex" is promoted to "long double _Complex".
451 int order = Context.getFloatingTypeOrder(lhs, rhs);
452
453 // If both are complex, just cast to the more precise type.
454 if (LHSComplexFloat && RHSComplexFloat) {
455 if (order > 0) {
456 // _Complex float -> _Complex double
John McCall2bb5d002010-11-13 09:02:35 +0000457 ImpCastExprToType(rhsExpr, lhs, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000458 return lhs;
459
460 } else if (order < 0) {
461 // _Complex float -> _Complex double
462 if (!isCompAssign)
John McCall2bb5d002010-11-13 09:02:35 +0000463 ImpCastExprToType(lhsExpr, rhs, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000464 return rhs;
465 }
466 return lhs;
467 }
468
469 // If just the LHS is complex, the RHS needs to be converted,
470 // and the LHS might need to be promoted.
471 if (LHSComplexFloat) {
472 if (order > 0) { // LHS is wider
473 // float -> _Complex double
John McCall2bb5d002010-11-13 09:02:35 +0000474 QualType fp = cast<ComplexType>(lhs)->getElementType();
475 ImpCastExprToType(rhsExpr, fp, CK_FloatingCast);
476 ImpCastExprToType(rhsExpr, lhs, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000477 return lhs;
478 }
479
480 // RHS is at least as wide. Find its corresponding complex type.
481 QualType result = (order == 0 ? lhs : Context.getComplexType(rhs));
482
483 // double -> _Complex double
John McCall2bb5d002010-11-13 09:02:35 +0000484 ImpCastExprToType(rhsExpr, result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000485
486 // _Complex float -> _Complex double
487 if (!isCompAssign && order < 0)
John McCall2bb5d002010-11-13 09:02:35 +0000488 ImpCastExprToType(lhsExpr, result, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000489
490 return result;
491 }
492
493 // Just the RHS is complex, so the LHS needs to be converted
494 // and the RHS might need to be promoted.
495 assert(RHSComplexFloat);
496
497 if (order < 0) { // RHS is wider
498 // float -> _Complex double
John McCall2bb5d002010-11-13 09:02:35 +0000499 if (!isCompAssign) {
500 ImpCastExprToType(lhsExpr, rhs, CK_FloatingCast);
501 ImpCastExprToType(lhsExpr, rhs, CK_FloatingRealToComplex);
502 }
John McCallcf33b242010-11-13 08:17:45 +0000503 return rhs;
504 }
505
506 // LHS is at least as wide. Find its corresponding complex type.
507 QualType result = (order == 0 ? rhs : Context.getComplexType(lhs));
508
509 // double -> _Complex double
510 if (!isCompAssign)
John McCall2bb5d002010-11-13 09:02:35 +0000511 ImpCastExprToType(lhsExpr, result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000512
513 // _Complex float -> _Complex double
514 if (order > 0)
John McCall2bb5d002010-11-13 09:02:35 +0000515 ImpCastExprToType(rhsExpr, result, CK_FloatingComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000516
517 return result;
518 }
519
520 // Now handle "real" floating types (i.e. float, double, long double).
521 bool LHSFloat = lhs->isRealFloatingType();
522 bool RHSFloat = rhs->isRealFloatingType();
523 if (LHSFloat || RHSFloat) {
524 // If we have two real floating types, convert the smaller operand
525 // to the bigger result.
526 if (LHSFloat && RHSFloat) {
527 int order = Context.getFloatingTypeOrder(lhs, rhs);
528 if (order > 0) {
529 ImpCastExprToType(rhsExpr, lhs, CK_FloatingCast);
530 return lhs;
531 }
532
533 assert(order < 0 && "illegal float comparison");
534 if (!isCompAssign)
535 ImpCastExprToType(lhsExpr, rhs, CK_FloatingCast);
536 return rhs;
537 }
538
539 // If we have an integer operand, the result is the real floating type.
540 if (LHSFloat) {
541 if (rhs->isIntegerType()) {
542 // Convert rhs to the lhs floating point type.
543 ImpCastExprToType(rhsExpr, lhs, CK_IntegralToFloating);
544 return lhs;
545 }
546
547 // Convert both sides to the appropriate complex float.
548 assert(rhs->isComplexIntegerType());
549 QualType result = Context.getComplexType(lhs);
550
551 // _Complex int -> _Complex float
John McCallf3ea8cf2010-11-14 08:17:51 +0000552 ImpCastExprToType(rhsExpr, result, CK_IntegralComplexToFloatingComplex);
John McCallcf33b242010-11-13 08:17:45 +0000553
554 // float -> _Complex float
555 if (!isCompAssign)
John McCall2bb5d002010-11-13 09:02:35 +0000556 ImpCastExprToType(lhsExpr, result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000557
558 return result;
559 }
560
561 assert(RHSFloat);
562 if (lhs->isIntegerType()) {
563 // Convert lhs to the rhs floating point type.
564 if (!isCompAssign)
565 ImpCastExprToType(lhsExpr, rhs, CK_IntegralToFloating);
566 return rhs;
567 }
568
569 // Convert both sides to the appropriate complex float.
570 assert(lhs->isComplexIntegerType());
571 QualType result = Context.getComplexType(rhs);
572
573 // _Complex int -> _Complex float
574 if (!isCompAssign)
John McCallf3ea8cf2010-11-14 08:17:51 +0000575 ImpCastExprToType(lhsExpr, result, CK_IntegralComplexToFloatingComplex);
John McCallcf33b242010-11-13 08:17:45 +0000576
577 // float -> _Complex float
John McCall2bb5d002010-11-13 09:02:35 +0000578 ImpCastExprToType(rhsExpr, result, CK_FloatingRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000579
580 return result;
581 }
582
583 // Handle GCC complex int extension.
584 // FIXME: if the operands are (int, _Complex long), we currently
585 // don't promote the complex. Also, signedness?
586 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType();
587 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType();
588 if (lhsComplexInt && rhsComplexInt) {
589 int order = Context.getIntegerTypeOrder(lhsComplexInt->getElementType(),
590 rhsComplexInt->getElementType());
591 assert(order && "inequal types with equal element ordering");
592 if (order > 0) {
593 // _Complex int -> _Complex long
John McCall2bb5d002010-11-13 09:02:35 +0000594 ImpCastExprToType(rhsExpr, lhs, CK_IntegralComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000595 return lhs;
596 }
597
598 if (!isCompAssign)
John McCall2bb5d002010-11-13 09:02:35 +0000599 ImpCastExprToType(lhsExpr, rhs, CK_IntegralComplexCast);
John McCallcf33b242010-11-13 08:17:45 +0000600 return rhs;
601 } else if (lhsComplexInt) {
602 // int -> _Complex int
John McCall2bb5d002010-11-13 09:02:35 +0000603 ImpCastExprToType(rhsExpr, lhs, CK_IntegralRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000604 return lhs;
605 } else if (rhsComplexInt) {
606 // int -> _Complex int
607 if (!isCompAssign)
John McCall2bb5d002010-11-13 09:02:35 +0000608 ImpCastExprToType(lhsExpr, rhs, CK_IntegralRealToComplex);
John McCallcf33b242010-11-13 08:17:45 +0000609 return rhs;
610 }
611
612 // Finally, we have two differing integer types.
613 // The rules for this case are in C99 6.3.1.8
614 int compare = Context.getIntegerTypeOrder(lhs, rhs);
615 bool lhsSigned = lhs->hasSignedIntegerRepresentation(),
616 rhsSigned = rhs->hasSignedIntegerRepresentation();
617 if (lhsSigned == rhsSigned) {
618 // Same signedness; use the higher-ranked type
619 if (compare >= 0) {
620 ImpCastExprToType(rhsExpr, lhs, CK_IntegralCast);
621 return lhs;
622 } else if (!isCompAssign)
623 ImpCastExprToType(lhsExpr, rhs, CK_IntegralCast);
624 return rhs;
625 } else if (compare != (lhsSigned ? 1 : -1)) {
626 // The unsigned type has greater than or equal rank to the
627 // signed type, so use the unsigned type
628 if (rhsSigned) {
629 ImpCastExprToType(rhsExpr, lhs, CK_IntegralCast);
630 return lhs;
631 } else if (!isCompAssign)
632 ImpCastExprToType(lhsExpr, rhs, CK_IntegralCast);
633 return rhs;
634 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) {
635 // The two types are different widths; if we are here, that
636 // means the signed type is larger than the unsigned type, so
637 // use the signed type.
638 if (lhsSigned) {
639 ImpCastExprToType(rhsExpr, lhs, CK_IntegralCast);
640 return lhs;
641 } else if (!isCompAssign)
642 ImpCastExprToType(lhsExpr, rhs, CK_IntegralCast);
643 return rhs;
644 } else {
645 // The signed type is higher-ranked than the unsigned type,
646 // but isn't actually any bigger (like unsigned int and long
647 // on most 32-bit systems). Use the unsigned type corresponding
648 // to the signed type.
649 QualType result =
650 Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs);
651 ImpCastExprToType(rhsExpr, result, CK_IntegralCast);
652 if (!isCompAssign)
653 ImpCastExprToType(lhsExpr, result, CK_IntegralCast);
654 return result;
655 }
Douglas Gregoreb8f3062008-11-12 17:17:38 +0000656}
657
Chris Lattnere7a2e912008-07-25 21:10:04 +0000658//===----------------------------------------------------------------------===//
659// Semantic Analysis for various Expression Types
660//===----------------------------------------------------------------------===//
661
662
Steve Narofff69936d2007-09-16 03:34:24 +0000663/// ActOnStringLiteral - The specified tokens were lexed as pasted string
Reid Spencer5f016e22007-07-11 17:01:13 +0000664/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string
665/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from
666/// multiple tokens. However, the common case is that StringToks points to one
667/// string.
Sebastian Redlcd965b92009-01-18 18:53:16 +0000668///
John McCall60d7b3a2010-08-24 06:29:42 +0000669ExprResult
Sean Hunt6cf75022010-08-30 17:47:05 +0000670Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000671 assert(NumStringToks && "Must have at least one string!");
672
Chris Lattnerbbee00b2009-01-16 18:51:42 +0000673 StringLiteralParser Literal(StringToks, NumStringToks, PP);
Reid Spencer5f016e22007-07-11 17:01:13 +0000674 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +0000675 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +0000676
677 llvm::SmallVector<SourceLocation, 4> StringTokLocs;
678 for (unsigned i = 0; i != NumStringToks; ++i)
679 StringTokLocs.push_back(StringToks[i].getLocation());
Chris Lattnera7ad98f2008-02-11 00:02:17 +0000680
Chris Lattnera7ad98f2008-02-11 00:02:17 +0000681 QualType StrTy = Context.CharTy;
Argyrios Kyrtzidis55f4b022008-08-09 17:20:01 +0000682 if (Literal.AnyWide) StrTy = Context.getWCharType();
Chris Lattnera7ad98f2008-02-11 00:02:17 +0000683 if (Literal.Pascal) StrTy = Context.UnsignedCharTy;
Douglas Gregor77a52232008-09-12 00:47:35 +0000684
685 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
Chris Lattner7dc480f2010-06-15 18:05:34 +0000686 if (getLangOptions().CPlusPlus || getLangOptions().ConstStrings)
Douglas Gregor77a52232008-09-12 00:47:35 +0000687 StrTy.addConst();
Sebastian Redlcd965b92009-01-18 18:53:16 +0000688
Chris Lattnera7ad98f2008-02-11 00:02:17 +0000689 // Get an array type for the string, according to C99 6.4.5. This includes
690 // the nul terminator character as well as the string length for pascal
691 // strings.
692 StrTy = Context.getConstantArrayType(StrTy,
Chris Lattnerdbb1ecc2009-02-26 23:01:51 +0000693 llvm::APInt(32, Literal.GetNumStringChars()+1),
Chris Lattnera7ad98f2008-02-11 00:02:17 +0000694 ArrayType::Normal, 0);
Mike Stump1eb44332009-09-09 15:08:12 +0000695
Reid Spencer5f016e22007-07-11 17:01:13 +0000696 // Pass &StringTokLocs[0], StringTokLocs.size() to factory!
Sean Hunt6cf75022010-08-30 17:47:05 +0000697 return Owned(StringLiteral::Create(Context, Literal.GetString(),
698 Literal.GetStringLength(),
699 Literal.AnyWide, StrTy,
700 &StringTokLocs[0],
701 StringTokLocs.size()));
Reid Spencer5f016e22007-07-11 17:01:13 +0000702}
703
Chris Lattner639e2d32008-10-20 05:16:36 +0000704/// ShouldSnapshotBlockValueReference - Return true if a reference inside of
705/// CurBlock to VD should cause it to be snapshotted (as we do for auto
706/// variables defined outside the block) or false if this is not needed (e.g.
707/// for values inside the block or for globals).
708///
Douglas Gregor076ceb02010-03-01 20:44:28 +0000709/// This also keeps the 'hasBlockDeclRefExprs' in the BlockScopeInfo records
Chris Lattner17f3a6d2009-04-21 22:26:47 +0000710/// up-to-date.
711///
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000712static bool ShouldSnapshotBlockValueReference(Sema &S, BlockScopeInfo *CurBlock,
Chris Lattner639e2d32008-10-20 05:16:36 +0000713 ValueDecl *VD) {
714 // If the value is defined inside the block, we couldn't snapshot it even if
715 // we wanted to.
716 if (CurBlock->TheDecl == VD->getDeclContext())
717 return false;
Mike Stump1eb44332009-09-09 15:08:12 +0000718
Chris Lattner639e2d32008-10-20 05:16:36 +0000719 // If this is an enum constant or function, it is constant, don't snapshot.
720 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD))
721 return false;
722
723 // If this is a reference to an extern, static, or global variable, no need to
724 // snapshot it.
725 // FIXME: What about 'const' variables in C++?
726 if (const VarDecl *Var = dyn_cast<VarDecl>(VD))
Chris Lattner17f3a6d2009-04-21 22:26:47 +0000727 if (!Var->hasLocalStorage())
728 return false;
Mike Stump1eb44332009-09-09 15:08:12 +0000729
Chris Lattner17f3a6d2009-04-21 22:26:47 +0000730 // Blocks that have these can't be constant.
731 CurBlock->hasBlockDeclRefExprs = true;
732
733 // If we have nested blocks, the decl may be declared in an outer block (in
734 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may
735 // be defined outside all of the current blocks (in which case the blocks do
736 // all get the bit). Walk the nesting chain.
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000737 for (unsigned I = S.FunctionScopes.size() - 1; I; --I) {
738 BlockScopeInfo *NextBlock = dyn_cast<BlockScopeInfo>(S.FunctionScopes[I]);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +0000739
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000740 if (!NextBlock)
741 continue;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +0000742
Chris Lattner17f3a6d2009-04-21 22:26:47 +0000743 // If we found the defining block for the variable, don't mark the block as
744 // having a reference outside it.
745 if (NextBlock->TheDecl == VD->getDeclContext())
746 break;
Mike Stump1eb44332009-09-09 15:08:12 +0000747
Chris Lattner17f3a6d2009-04-21 22:26:47 +0000748 // Otherwise, the DeclRef from the inner block causes the outer one to need
749 // a snapshot as well.
750 NextBlock->hasBlockDeclRefExprs = true;
751 }
Mike Stump1eb44332009-09-09 15:08:12 +0000752
Chris Lattner639e2d32008-10-20 05:16:36 +0000753 return true;
Mike Stump1eb44332009-09-09 15:08:12 +0000754}
755
Chris Lattner639e2d32008-10-20 05:16:36 +0000756
John McCall60d7b3a2010-08-24 06:29:42 +0000757ExprResult
John McCallf89e55a2010-11-18 06:31:45 +0000758Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty, ExprValueKind VK,
759 SourceLocation Loc, const CXXScopeSpec *SS) {
Abramo Bagnara25777432010-08-11 22:01:17 +0000760 DeclarationNameInfo NameInfo(D->getDeclName(), Loc);
John McCallf89e55a2010-11-18 06:31:45 +0000761 return BuildDeclRefExpr(D, Ty, VK, NameInfo, SS);
Abramo Bagnara25777432010-08-11 22:01:17 +0000762}
763
764/// BuildDeclRefExpr - Build a DeclRefExpr.
John McCall60d7b3a2010-08-24 06:29:42 +0000765ExprResult
Abramo Bagnara25777432010-08-11 22:01:17 +0000766Sema::BuildDeclRefExpr(ValueDecl *D, QualType Ty,
John McCallf89e55a2010-11-18 06:31:45 +0000767 ExprValueKind VK,
Abramo Bagnara25777432010-08-11 22:01:17 +0000768 const DeclarationNameInfo &NameInfo,
769 const CXXScopeSpec *SS) {
Anders Carlssone2bb2242009-06-26 19:16:07 +0000770 if (Context.getCanonicalType(Ty) == Context.UndeducedAutoTy) {
Abramo Bagnara25777432010-08-11 22:01:17 +0000771 Diag(NameInfo.getLoc(),
Mike Stump1eb44332009-09-09 15:08:12 +0000772 diag::err_auto_variable_cannot_appear_in_own_initializer)
Anders Carlssone2bb2242009-06-26 19:16:07 +0000773 << D->getDeclName();
774 return ExprError();
775 }
Mike Stump1eb44332009-09-09 15:08:12 +0000776
Anders Carlssone41590d2009-06-24 00:10:43 +0000777 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
Douglas Gregor15dedf02010-04-27 21:10:04 +0000778 if (isa<NonTypeTemplateParmDecl>(VD)) {
779 // Non-type template parameters can be referenced anywhere they are
780 // visible.
Douglas Gregor63982352010-07-13 18:40:04 +0000781 Ty = Ty.getNonLValueExprType(Context);
Douglas Gregor15dedf02010-04-27 21:10:04 +0000782 } else if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) {
Anders Carlssone41590d2009-06-24 00:10:43 +0000783 if (const FunctionDecl *FD = MD->getParent()->isLocalClass()) {
784 if (VD->hasLocalStorage() && VD->getDeclContext() != CurContext) {
Abramo Bagnara25777432010-08-11 22:01:17 +0000785 Diag(NameInfo.getLoc(),
786 diag::err_reference_to_local_var_in_enclosing_function)
Anders Carlssone41590d2009-06-24 00:10:43 +0000787 << D->getIdentifier() << FD->getDeclName();
Mike Stump1eb44332009-09-09 15:08:12 +0000788 Diag(D->getLocation(), diag::note_local_variable_declared_here)
Anders Carlssone41590d2009-06-24 00:10:43 +0000789 << D->getIdentifier();
790 return ExprError();
791 }
792 }
John McCall09431682010-11-18 19:01:18 +0000793
794 // This ridiculousness brought to you by 'extern void x;' and the
795 // GNU compiler collection.
796 } else if (!getLangOptions().CPlusPlus && !Ty.hasQualifiers() &&
797 Ty->isVoidType()) {
798 VK = VK_RValue;
Anders Carlssone41590d2009-06-24 00:10:43 +0000799 }
800 }
Mike Stump1eb44332009-09-09 15:08:12 +0000801
Abramo Bagnara25777432010-08-11 22:01:17 +0000802 MarkDeclarationReferenced(NameInfo.getLoc(), D);
Mike Stump1eb44332009-09-09 15:08:12 +0000803
John McCall7eb0a9e2010-11-24 05:12:34 +0000804 Expr *E = DeclRefExpr::Create(Context,
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +0000805 SS? (NestedNameSpecifier *)SS->getScopeRep() : 0,
John McCall7eb0a9e2010-11-24 05:12:34 +0000806 SS? SS->getRange() : SourceRange(),
807 D, NameInfo, Ty, VK);
808
809 // Just in case we're building an illegal pointer-to-member.
810 if (isa<FieldDecl>(D) && cast<FieldDecl>(D)->getBitWidth())
811 E->setObjectKind(OK_BitField);
812
813 return Owned(E);
Douglas Gregor1a49af92009-01-06 05:10:23 +0000814}
815
John McCalldfa1edb2010-11-23 20:48:44 +0000816static ExprResult
817BuildFieldReferenceExpr(Sema &S, Expr *BaseExpr, bool IsArrow,
818 const CXXScopeSpec &SS, FieldDecl *Field,
819 DeclAccessPair FoundDecl,
820 const DeclarationNameInfo &MemberNameInfo);
821
John McCall60d7b3a2010-08-24 06:29:42 +0000822ExprResult
Douglas Gregorffb4b6e2009-04-15 06:41:24 +0000823Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc,
Francois Pichet87c2e122010-11-21 06:08:52 +0000824 IndirectFieldDecl *IndirectField,
Douglas Gregorffb4b6e2009-04-15 06:41:24 +0000825 Expr *BaseObjectExpr,
826 SourceLocation OpLoc) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000827 // Build the expression that refers to the base object, from
828 // which we will build a sequence of member references to each
829 // of the anonymous union objects and, eventually, the field we
830 // found via name lookup.
831 bool BaseObjectIsPointer = false;
John McCall0953e762009-09-24 19:53:00 +0000832 Qualifiers BaseQuals;
Francois Pichet87c2e122010-11-21 06:08:52 +0000833 VarDecl *BaseObject = IndirectField->getVarDecl();
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000834 if (BaseObject) {
835 // BaseObject is an anonymous struct/union variable (and is,
836 // therefore, not part of another non-anonymous record).
Douglas Gregore0762c92009-06-19 23:52:42 +0000837 MarkDeclarationReferenced(Loc, BaseObject);
John McCallf89e55a2010-11-18 06:31:45 +0000838 BaseObjectExpr =
839 new (Context) DeclRefExpr(BaseObject, BaseObject->getType(),
840 VK_LValue, Loc);
John McCall0953e762009-09-24 19:53:00 +0000841 BaseQuals
842 = Context.getCanonicalType(BaseObject->getType()).getQualifiers();
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000843 } else if (BaseObjectExpr) {
844 // The caller provided the base object expression. Determine
845 // whether its a pointer and whether it adds any qualifiers to the
846 // anonymous struct/union fields we're looking into.
847 QualType ObjectType = BaseObjectExpr->getType();
Ted Kremenek6217b802009-07-29 21:53:49 +0000848 if (const PointerType *ObjectPtr = ObjectType->getAs<PointerType>()) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000849 BaseObjectIsPointer = true;
850 ObjectType = ObjectPtr->getPointeeType();
851 }
John McCall0953e762009-09-24 19:53:00 +0000852 BaseQuals
853 = Context.getCanonicalType(ObjectType).getQualifiers();
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000854 } else {
855 // We've found a member of an anonymous struct/union that is
856 // inside a non-anonymous struct/union, so in a well-formed
857 // program our base object expression is "this".
John McCallea1471e2010-05-20 01:18:31 +0000858 DeclContext *DC = getFunctionLevelDeclContext();
859 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) {
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000860 if (!MD->isStatic()) {
Mike Stump1eb44332009-09-09 15:08:12 +0000861 QualType AnonFieldType
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000862 = Context.getTagDeclType(
Francois Pichet87c2e122010-11-21 06:08:52 +0000863 cast<RecordDecl>(
864 (*IndirectField->chain_begin())->getDeclContext()));
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000865 QualType ThisType = Context.getTagDeclType(MD->getParent());
Mike Stump1eb44332009-09-09 15:08:12 +0000866 if ((Context.getCanonicalType(AnonFieldType)
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000867 == Context.getCanonicalType(ThisType)) ||
868 IsDerivedFrom(ThisType, AnonFieldType)) {
869 // Our base object expression is "this".
Douglas Gregor8aa5f402009-12-24 20:23:34 +0000870 BaseObjectExpr = new (Context) CXXThisExpr(Loc,
Douglas Gregor828a1972010-01-07 23:12:05 +0000871 MD->getThisType(Context),
872 /*isImplicit=*/true);
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000873 BaseObjectIsPointer = true;
874 }
875 } else {
Sebastian Redlcd965b92009-01-18 18:53:16 +0000876 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method)
Francois Pichet87c2e122010-11-21 06:08:52 +0000877 << IndirectField->getDeclName());
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000878 }
John McCall0953e762009-09-24 19:53:00 +0000879 BaseQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers());
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000880 }
881
Mike Stump1eb44332009-09-09 15:08:12 +0000882 if (!BaseObjectExpr)
Sebastian Redlcd965b92009-01-18 18:53:16 +0000883 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use)
Francois Pichet87c2e122010-11-21 06:08:52 +0000884 << IndirectField->getDeclName());
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000885 }
886
887 // Build the implicit member references to the field of the
888 // anonymous struct/union.
889 Expr *Result = BaseObjectExpr;
John McCalldfa1edb2010-11-23 20:48:44 +0000890
Francois Pichet87c2e122010-11-21 06:08:52 +0000891 IndirectFieldDecl::chain_iterator FI = IndirectField->chain_begin(),
892 FEnd = IndirectField->chain_end();
John McCalldfa1edb2010-11-23 20:48:44 +0000893
Francois Pichet87c2e122010-11-21 06:08:52 +0000894 // Skip the first VarDecl if present.
895 if (BaseObject)
896 FI++;
897 for (; FI != FEnd; FI++) {
898 FieldDecl *Field = cast<FieldDecl>(*FI);
John McCall0953e762009-09-24 19:53:00 +0000899
John McCalldfa1edb2010-11-23 20:48:44 +0000900 // FIXME: the first access can be qualified
901 CXXScopeSpec SS;
John McCall0953e762009-09-24 19:53:00 +0000902
John McCalldfa1edb2010-11-23 20:48:44 +0000903 // FIXME: these are somewhat meaningless
904 DeclarationNameInfo MemberNameInfo(Field->getDeclName(), Loc);
905 DeclAccessPair FoundDecl = DeclAccessPair::make(Field, Field->getAccess());
John McCall0953e762009-09-24 19:53:00 +0000906
John McCalldfa1edb2010-11-23 20:48:44 +0000907 Result = BuildFieldReferenceExpr(*this, Result, BaseObjectIsPointer,
908 SS, Field, FoundDecl, MemberNameInfo)
909 .take();
John McCall0953e762009-09-24 19:53:00 +0000910
John McCalldfa1edb2010-11-23 20:48:44 +0000911 // All the implicit accesses are dot-accesses.
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000912 BaseObjectIsPointer = false;
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000913 }
914
Sebastian Redlcd965b92009-01-18 18:53:16 +0000915 return Owned(Result);
Douglas Gregorbcbffc42009-01-07 00:43:41 +0000916}
917
Abramo Bagnara25777432010-08-11 22:01:17 +0000918/// Decomposes the given name into a DeclarationNameInfo, its location, and
John McCall129e2df2009-11-30 22:42:35 +0000919/// possibly a list of template arguments.
920///
921/// If this produces template arguments, it is permitted to call
922/// DecomposeTemplateName.
923///
924/// This actually loses a lot of source location information for
925/// non-standard name kinds; we should consider preserving that in
926/// some way.
927static void DecomposeUnqualifiedId(Sema &SemaRef,
928 const UnqualifiedId &Id,
929 TemplateArgumentListInfo &Buffer,
Abramo Bagnara25777432010-08-11 22:01:17 +0000930 DeclarationNameInfo &NameInfo,
John McCall129e2df2009-11-30 22:42:35 +0000931 const TemplateArgumentListInfo *&TemplateArgs) {
932 if (Id.getKind() == UnqualifiedId::IK_TemplateId) {
933 Buffer.setLAngleLoc(Id.TemplateId->LAngleLoc);
934 Buffer.setRAngleLoc(Id.TemplateId->RAngleLoc);
935
936 ASTTemplateArgsPtr TemplateArgsPtr(SemaRef,
937 Id.TemplateId->getTemplateArgs(),
938 Id.TemplateId->NumArgs);
939 SemaRef.translateTemplateArguments(TemplateArgsPtr, Buffer);
940 TemplateArgsPtr.release();
941
John McCall2b5289b2010-08-23 07:28:44 +0000942 TemplateName TName = Id.TemplateId->Template.get();
Abramo Bagnara25777432010-08-11 22:01:17 +0000943 SourceLocation TNameLoc = Id.TemplateId->TemplateNameLoc;
944 NameInfo = SemaRef.Context.getNameForTemplate(TName, TNameLoc);
John McCall129e2df2009-11-30 22:42:35 +0000945 TemplateArgs = &Buffer;
946 } else {
Abramo Bagnara25777432010-08-11 22:01:17 +0000947 NameInfo = SemaRef.GetNameFromUnqualifiedId(Id);
John McCall129e2df2009-11-30 22:42:35 +0000948 TemplateArgs = 0;
949 }
950}
951
John McCall4c72d3e2010-02-08 19:26:07 +0000952/// Determines whether the given record is "fully-formed" at the given
953/// location, i.e. whether a qualified lookup into it is assured of
954/// getting consistent results already.
John McCall129e2df2009-11-30 22:42:35 +0000955static bool IsFullyFormedScope(Sema &SemaRef, CXXRecordDecl *Record) {
John McCall4c72d3e2010-02-08 19:26:07 +0000956 if (!Record->hasDefinition())
957 return false;
958
John McCall129e2df2009-11-30 22:42:35 +0000959 for (CXXRecordDecl::base_class_iterator I = Record->bases_begin(),
960 E = Record->bases_end(); I != E; ++I) {
961 CanQualType BaseT = SemaRef.Context.getCanonicalType((*I).getType());
962 CanQual<RecordType> BaseRT = BaseT->getAs<RecordType>();
963 if (!BaseRT) return false;
964
965 CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(BaseRT->getDecl());
John McCall4c72d3e2010-02-08 19:26:07 +0000966 if (!BaseRecord->hasDefinition() ||
John McCall129e2df2009-11-30 22:42:35 +0000967 !IsFullyFormedScope(SemaRef, BaseRecord))
968 return false;
969 }
970
971 return true;
972}
973
John McCallaa81e162009-12-01 22:10:20 +0000974/// Determines if the given class is provably not derived from all of
975/// the prospective base classes.
976static bool IsProvablyNotDerivedFrom(Sema &SemaRef,
977 CXXRecordDecl *Record,
978 const llvm::SmallPtrSet<CXXRecordDecl*, 4> &Bases) {
John McCallb1b42562009-12-01 22:28:41 +0000979 if (Bases.count(Record->getCanonicalDecl()))
John McCallaa81e162009-12-01 22:10:20 +0000980 return false;
981
Douglas Gregor952b0172010-02-11 01:04:33 +0000982 RecordDecl *RD = Record->getDefinition();
John McCallb1b42562009-12-01 22:28:41 +0000983 if (!RD) return false;
984 Record = cast<CXXRecordDecl>(RD);
985
John McCallaa81e162009-12-01 22:10:20 +0000986 for (CXXRecordDecl::base_class_iterator I = Record->bases_begin(),
987 E = Record->bases_end(); I != E; ++I) {
988 CanQualType BaseT = SemaRef.Context.getCanonicalType((*I).getType());
989 CanQual<RecordType> BaseRT = BaseT->getAs<RecordType>();
990 if (!BaseRT) return false;
991
992 CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(BaseRT->getDecl());
John McCallaa81e162009-12-01 22:10:20 +0000993 if (!IsProvablyNotDerivedFrom(SemaRef, BaseRecord, Bases))
994 return false;
995 }
996
997 return true;
998}
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +0000999
John McCallaa81e162009-12-01 22:10:20 +00001000enum IMAKind {
1001 /// The reference is definitely not an instance member access.
1002 IMA_Static,
1003
1004 /// The reference may be an implicit instance member access.
1005 IMA_Mixed,
1006
1007 /// The reference may be to an instance member, but it is invalid if
1008 /// so, because the context is not an instance method.
1009 IMA_Mixed_StaticContext,
1010
1011 /// The reference may be to an instance member, but it is invalid if
1012 /// so, because the context is from an unrelated class.
1013 IMA_Mixed_Unrelated,
1014
1015 /// The reference is definitely an implicit instance member access.
1016 IMA_Instance,
1017
1018 /// The reference may be to an unresolved using declaration.
1019 IMA_Unresolved,
1020
1021 /// The reference may be to an unresolved using declaration and the
1022 /// context is not an instance method.
1023 IMA_Unresolved_StaticContext,
1024
John McCallaa81e162009-12-01 22:10:20 +00001025 /// All possible referrents are instance members and the current
1026 /// context is not an instance method.
1027 IMA_Error_StaticContext,
1028
1029 /// All possible referrents are instance members of an unrelated
1030 /// class.
1031 IMA_Error_Unrelated
1032};
1033
1034/// The given lookup names class member(s) and is not being used for
1035/// an address-of-member expression. Classify the type of access
1036/// according to whether it's possible that this reference names an
1037/// instance member. This is best-effort; it is okay to
1038/// conservatively answer "yes", in which case some errors will simply
1039/// not be caught until template-instantiation.
1040static IMAKind ClassifyImplicitMemberAccess(Sema &SemaRef,
1041 const LookupResult &R) {
John McCall3b4294e2009-12-16 12:17:52 +00001042 assert(!R.empty() && (*R.begin())->isCXXClassMember());
John McCallaa81e162009-12-01 22:10:20 +00001043
John McCallea1471e2010-05-20 01:18:31 +00001044 DeclContext *DC = SemaRef.getFunctionLevelDeclContext();
John McCallaa81e162009-12-01 22:10:20 +00001045 bool isStaticContext =
John McCallea1471e2010-05-20 01:18:31 +00001046 (!isa<CXXMethodDecl>(DC) ||
1047 cast<CXXMethodDecl>(DC)->isStatic());
John McCallaa81e162009-12-01 22:10:20 +00001048
1049 if (R.isUnresolvableResult())
1050 return isStaticContext ? IMA_Unresolved_StaticContext : IMA_Unresolved;
1051
1052 // Collect all the declaring classes of instance members we find.
1053 bool hasNonInstance = false;
Sebastian Redlf9780002010-11-26 16:28:07 +00001054 bool hasField = false;
John McCallaa81e162009-12-01 22:10:20 +00001055 llvm::SmallPtrSet<CXXRecordDecl*, 4> Classes;
1056 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
John McCall161755a2010-04-06 21:38:20 +00001057 NamedDecl *D = *I;
Francois Pichet87c2e122010-11-21 06:08:52 +00001058
John McCall161755a2010-04-06 21:38:20 +00001059 if (D->isCXXInstanceMember()) {
Sebastian Redlf9780002010-11-26 16:28:07 +00001060 if (dyn_cast<FieldDecl>(D))
1061 hasField = true;
1062
John McCallaa81e162009-12-01 22:10:20 +00001063 CXXRecordDecl *R = cast<CXXRecordDecl>(D->getDeclContext());
John McCallaa81e162009-12-01 22:10:20 +00001064 Classes.insert(R->getCanonicalDecl());
1065 }
1066 else
1067 hasNonInstance = true;
1068 }
1069
1070 // If we didn't find any instance members, it can't be an implicit
1071 // member reference.
1072 if (Classes.empty())
1073 return IMA_Static;
1074
1075 // If the current context is not an instance method, it can't be
1076 // an implicit member reference.
Sebastian Redlf9780002010-11-26 16:28:07 +00001077 if (isStaticContext) {
1078 if (hasNonInstance)
1079 return IMA_Mixed_StaticContext;
1080
1081 if (SemaRef.getLangOptions().CPlusPlus0x && hasField) {
1082 // C++0x [expr.prim.general]p10:
1083 // An id-expression that denotes a non-static data member or non-static
1084 // member function of a class can only be used:
1085 // (...)
1086 // - if that id-expression denotes a non-static data member and it appears in an unevaluated operand.
1087 const Sema::ExpressionEvaluationContextRecord& record = SemaRef.ExprEvalContexts.back();
1088 bool isUnevaluatedExpression = record.Context == Sema::Unevaluated;
1089 if (isUnevaluatedExpression)
1090 return IMA_Mixed_StaticContext;
1091 }
1092
1093 return IMA_Error_StaticContext;
1094 }
John McCallaa81e162009-12-01 22:10:20 +00001095
1096 // If we can prove that the current context is unrelated to all the
1097 // declaring classes, it can't be an implicit member reference (in
1098 // which case it's an error if any of those members are selected).
1099 if (IsProvablyNotDerivedFrom(SemaRef,
John McCallea1471e2010-05-20 01:18:31 +00001100 cast<CXXMethodDecl>(DC)->getParent(),
John McCallaa81e162009-12-01 22:10:20 +00001101 Classes))
1102 return (hasNonInstance ? IMA_Mixed_Unrelated : IMA_Error_Unrelated);
1103
1104 return (hasNonInstance ? IMA_Mixed : IMA_Instance);
1105}
1106
1107/// Diagnose a reference to a field with no object available.
1108static void DiagnoseInstanceReference(Sema &SemaRef,
1109 const CXXScopeSpec &SS,
1110 const LookupResult &R) {
1111 SourceLocation Loc = R.getNameLoc();
1112 SourceRange Range(Loc);
1113 if (SS.isSet()) Range.setBegin(SS.getRange().getBegin());
1114
1115 if (R.getAsSingle<FieldDecl>()) {
1116 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(SemaRef.CurContext)) {
1117 if (MD->isStatic()) {
1118 // "invalid use of member 'x' in static member function"
1119 SemaRef.Diag(Loc, diag::err_invalid_member_use_in_static_method)
1120 << Range << R.getLookupName();
1121 return;
1122 }
1123 }
1124
1125 SemaRef.Diag(Loc, diag::err_invalid_non_static_member_use)
1126 << R.getLookupName() << Range;
1127 return;
1128 }
1129
1130 SemaRef.Diag(Loc, diag::err_member_call_without_object) << Range;
John McCall129e2df2009-11-30 22:42:35 +00001131}
1132
John McCall578b69b2009-12-16 08:11:27 +00001133/// Diagnose an empty lookup.
1134///
1135/// \return false if new lookup candidates were found
Nick Lewycky03d98c52010-07-06 19:51:49 +00001136bool Sema::DiagnoseEmptyLookup(Scope *S, CXXScopeSpec &SS, LookupResult &R,
1137 CorrectTypoContext CTC) {
John McCall578b69b2009-12-16 08:11:27 +00001138 DeclarationName Name = R.getLookupName();
1139
John McCall578b69b2009-12-16 08:11:27 +00001140 unsigned diagnostic = diag::err_undeclared_var_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001141 unsigned diagnostic_suggest = diag::err_undeclared_var_use_suggest;
John McCall578b69b2009-12-16 08:11:27 +00001142 if (Name.getNameKind() == DeclarationName::CXXOperatorName ||
1143 Name.getNameKind() == DeclarationName::CXXLiteralOperatorName ||
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001144 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
John McCall578b69b2009-12-16 08:11:27 +00001145 diagnostic = diag::err_undeclared_use;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001146 diagnostic_suggest = diag::err_undeclared_use_suggest;
1147 }
John McCall578b69b2009-12-16 08:11:27 +00001148
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001149 // If the original lookup was an unqualified lookup, fake an
1150 // unqualified lookup. This is useful when (for example) the
1151 // original lookup would not have found something because it was a
1152 // dependent name.
Nick Lewycky03d98c52010-07-06 19:51:49 +00001153 for (DeclContext *DC = SS.isEmpty() ? CurContext : 0;
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001154 DC; DC = DC->getParent()) {
John McCall578b69b2009-12-16 08:11:27 +00001155 if (isa<CXXRecordDecl>(DC)) {
1156 LookupQualifiedName(R, DC);
1157
1158 if (!R.empty()) {
1159 // Don't give errors about ambiguities in this lookup.
1160 R.suppressDiagnostics();
1161
1162 CXXMethodDecl *CurMethod = dyn_cast<CXXMethodDecl>(CurContext);
1163 bool isInstance = CurMethod &&
1164 CurMethod->isInstance() &&
1165 DC == CurMethod->getParent();
1166
1167 // Give a code modification hint to insert 'this->'.
1168 // TODO: fixit for inserting 'Base<T>::' in the other cases.
1169 // Actually quite difficult!
Nick Lewycky03d98c52010-07-06 19:51:49 +00001170 if (isInstance) {
Nick Lewycky03d98c52010-07-06 19:51:49 +00001171 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(
1172 CallsUndergoingInstantiation.back()->getCallee());
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001173 CXXMethodDecl *DepMethod = cast_or_null<CXXMethodDecl>(
Nick Lewycky03d98c52010-07-06 19:51:49 +00001174 CurMethod->getInstantiatedFromMemberFunction());
Eli Friedmana7e68452010-08-22 01:00:03 +00001175 if (DepMethod) {
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001176 Diag(R.getNameLoc(), diagnostic) << Name
1177 << FixItHint::CreateInsertion(R.getNameLoc(), "this->");
1178 QualType DepThisType = DepMethod->getThisType(Context);
1179 CXXThisExpr *DepThis = new (Context) CXXThisExpr(
1180 R.getNameLoc(), DepThisType, false);
1181 TemplateArgumentListInfo TList;
1182 if (ULE->hasExplicitTemplateArgs())
1183 ULE->copyTemplateArgumentsInto(TList);
1184 CXXDependentScopeMemberExpr *DepExpr =
1185 CXXDependentScopeMemberExpr::Create(
1186 Context, DepThis, DepThisType, true, SourceLocation(),
1187 ULE->getQualifier(), ULE->getQualifierRange(), NULL,
1188 R.getLookupNameInfo(), &TList);
1189 CallsUndergoingInstantiation.back()->setCallee(DepExpr);
Eli Friedmana7e68452010-08-22 01:00:03 +00001190 } else {
Nick Lewyckyd9ca4ab2010-08-20 20:54:15 +00001191 // FIXME: we should be able to handle this case too. It is correct
1192 // to add this-> here. This is a workaround for PR7947.
1193 Diag(R.getNameLoc(), diagnostic) << Name;
Eli Friedmana7e68452010-08-22 01:00:03 +00001194 }
Nick Lewycky03d98c52010-07-06 19:51:49 +00001195 } else {
John McCall578b69b2009-12-16 08:11:27 +00001196 Diag(R.getNameLoc(), diagnostic) << Name;
Nick Lewycky03d98c52010-07-06 19:51:49 +00001197 }
John McCall578b69b2009-12-16 08:11:27 +00001198
1199 // Do we really want to note all of these?
1200 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I)
1201 Diag((*I)->getLocation(), diag::note_dependent_var_use);
1202
1203 // Tell the callee to try to recover.
1204 return false;
1205 }
Douglas Gregore26f0432010-08-09 22:38:14 +00001206
1207 R.clear();
John McCall578b69b2009-12-16 08:11:27 +00001208 }
1209 }
1210
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001211 // We didn't find anything, so try to correct for a typo.
Douglas Gregoraaf87162010-04-14 20:04:41 +00001212 DeclarationName Corrected;
Daniel Dunbardc32cdf2010-06-02 15:46:52 +00001213 if (S && (Corrected = CorrectTypo(R, S, &SS, 0, false, CTC))) {
Douglas Gregoraaf87162010-04-14 20:04:41 +00001214 if (!R.empty()) {
1215 if (isa<ValueDecl>(*R.begin()) || isa<FunctionTemplateDecl>(*R.begin())) {
1216 if (SS.isEmpty())
1217 Diag(R.getNameLoc(), diagnostic_suggest) << Name << R.getLookupName()
1218 << FixItHint::CreateReplacement(R.getNameLoc(),
1219 R.getLookupName().getAsString());
1220 else
1221 Diag(R.getNameLoc(), diag::err_no_member_suggest)
1222 << Name << computeDeclContext(SS, false) << R.getLookupName()
1223 << SS.getRange()
1224 << FixItHint::CreateReplacement(R.getNameLoc(),
1225 R.getLookupName().getAsString());
1226 if (NamedDecl *ND = R.getAsSingle<NamedDecl>())
1227 Diag(ND->getLocation(), diag::note_previous_decl)
1228 << ND->getDeclName();
1229
1230 // Tell the callee to try to recover.
1231 return false;
1232 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001233
Douglas Gregoraaf87162010-04-14 20:04:41 +00001234 if (isa<TypeDecl>(*R.begin()) || isa<ObjCInterfaceDecl>(*R.begin())) {
1235 // FIXME: If we ended up with a typo for a type name or
1236 // Objective-C class name, we're in trouble because the parser
1237 // is in the wrong place to recover. Suggest the typo
1238 // correction, but don't make it a fix-it since we're not going
1239 // to recover well anyway.
1240 if (SS.isEmpty())
1241 Diag(R.getNameLoc(), diagnostic_suggest) << Name << R.getLookupName();
1242 else
1243 Diag(R.getNameLoc(), diag::err_no_member_suggest)
1244 << Name << computeDeclContext(SS, false) << R.getLookupName()
1245 << SS.getRange();
1246
1247 // Don't try to recover; it won't work.
1248 return true;
1249 }
1250 } else {
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001251 // FIXME: We found a keyword. Suggest it, but don't provide a fix-it
Douglas Gregoraaf87162010-04-14 20:04:41 +00001252 // because we aren't able to recover.
Douglas Gregord203a162010-01-01 00:15:04 +00001253 if (SS.isEmpty())
Douglas Gregoraaf87162010-04-14 20:04:41 +00001254 Diag(R.getNameLoc(), diagnostic_suggest) << Name << Corrected;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001255 else
Douglas Gregord203a162010-01-01 00:15:04 +00001256 Diag(R.getNameLoc(), diag::err_no_member_suggest)
Douglas Gregoraaf87162010-04-14 20:04:41 +00001257 << Name << computeDeclContext(SS, false) << Corrected
1258 << SS.getRange();
Douglas Gregord203a162010-01-01 00:15:04 +00001259 return true;
1260 }
Douglas Gregord203a162010-01-01 00:15:04 +00001261 R.clear();
Douglas Gregorbb092ba2009-12-31 05:20:13 +00001262 }
1263
1264 // Emit a special diagnostic for failed member lookups.
1265 // FIXME: computing the declaration context might fail here (?)
1266 if (!SS.isEmpty()) {
1267 Diag(R.getNameLoc(), diag::err_no_member)
1268 << Name << computeDeclContext(SS, false)
1269 << SS.getRange();
1270 return true;
1271 }
1272
John McCall578b69b2009-12-16 08:11:27 +00001273 // Give up, we can't recover.
1274 Diag(R.getNameLoc(), diagnostic) << Name;
1275 return true;
1276}
1277
Douglas Gregorca45da02010-11-02 20:36:02 +00001278ObjCPropertyDecl *Sema::canSynthesizeProvisionalIvar(IdentifierInfo *II) {
1279 ObjCMethodDecl *CurMeth = getCurMethodDecl();
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001280 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1281 if (!IDecl)
1282 return 0;
1283 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
1284 if (!ClassImpDecl)
1285 return 0;
Douglas Gregorca45da02010-11-02 20:36:02 +00001286 ObjCPropertyDecl *property = LookupPropertyDecl(IDecl, II);
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001287 if (!property)
1288 return 0;
1289 if (ObjCPropertyImplDecl *PIDecl = ClassImpDecl->FindPropertyImplDecl(II))
Douglas Gregorca45da02010-11-02 20:36:02 +00001290 if (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic ||
1291 PIDecl->getPropertyIvarDecl())
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001292 return 0;
1293 return property;
1294}
1295
Douglas Gregorca45da02010-11-02 20:36:02 +00001296bool Sema::canSynthesizeProvisionalIvar(ObjCPropertyDecl *Property) {
1297 ObjCMethodDecl *CurMeth = getCurMethodDecl();
1298 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1299 if (!IDecl)
1300 return false;
1301 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
1302 if (!ClassImpDecl)
1303 return false;
1304 if (ObjCPropertyImplDecl *PIDecl
1305 = ClassImpDecl->FindPropertyImplDecl(Property->getIdentifier()))
1306 if (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic ||
1307 PIDecl->getPropertyIvarDecl())
1308 return false;
1309
1310 return true;
1311}
1312
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001313static ObjCIvarDecl *SynthesizeProvisionalIvar(Sema &SemaRef,
Fariborz Jahanian73f666f2010-07-30 16:59:05 +00001314 LookupResult &Lookup,
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001315 IdentifierInfo *II,
1316 SourceLocation NameLoc) {
1317 ObjCMethodDecl *CurMeth = SemaRef.getCurMethodDecl();
Fariborz Jahanian73f666f2010-07-30 16:59:05 +00001318 bool LookForIvars;
1319 if (Lookup.empty())
1320 LookForIvars = true;
1321 else if (CurMeth->isClassMethod())
1322 LookForIvars = false;
1323 else
1324 LookForIvars = (Lookup.isSingleResult() &&
1325 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
1326 if (!LookForIvars)
1327 return 0;
1328
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001329 ObjCInterfaceDecl *IDecl = CurMeth->getClassInterface();
1330 if (!IDecl)
1331 return 0;
1332 ObjCImplementationDecl *ClassImpDecl = IDecl->getImplementation();
Fariborz Jahanian84ef4b22010-07-19 16:14:33 +00001333 if (!ClassImpDecl)
1334 return 0;
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001335 bool DynamicImplSeen = false;
1336 ObjCPropertyDecl *property = SemaRef.LookupPropertyDecl(IDecl, II);
1337 if (!property)
1338 return 0;
Fariborz Jahanian43e1b462010-10-19 19:08:23 +00001339 if (ObjCPropertyImplDecl *PIDecl = ClassImpDecl->FindPropertyImplDecl(II)) {
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001340 DynamicImplSeen =
1341 (PIDecl->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic);
Fariborz Jahanian43e1b462010-10-19 19:08:23 +00001342 // property implementation has a designated ivar. No need to assume a new
1343 // one.
1344 if (!DynamicImplSeen && PIDecl->getPropertyIvarDecl())
1345 return 0;
1346 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001347 if (!DynamicImplSeen) {
Fariborz Jahanian84ef4b22010-07-19 16:14:33 +00001348 QualType PropType = SemaRef.Context.getCanonicalType(property->getType());
1349 ObjCIvarDecl *Ivar = ObjCIvarDecl::Create(SemaRef.Context, ClassImpDecl,
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001350 NameLoc,
1351 II, PropType, /*Dinfo=*/0,
1352 ObjCIvarDecl::Protected,
1353 (Expr *)0, true);
1354 ClassImpDecl->addDecl(Ivar);
1355 IDecl->makeDeclVisibleInContext(Ivar, false);
1356 property->setPropertyIvarDecl(Ivar);
1357 return Ivar;
1358 }
1359 return 0;
1360}
1361
John McCall60d7b3a2010-08-24 06:29:42 +00001362ExprResult Sema::ActOnIdExpression(Scope *S,
John McCallfb97e752010-08-24 22:52:39 +00001363 CXXScopeSpec &SS,
1364 UnqualifiedId &Id,
1365 bool HasTrailingLParen,
1366 bool isAddressOfOperand) {
John McCallf7a1a742009-11-24 19:00:30 +00001367 assert(!(isAddressOfOperand && HasTrailingLParen) &&
1368 "cannot be direct & operand and have a trailing lparen");
1369
1370 if (SS.isInvalid())
Douglas Gregor4c921ae2009-01-30 01:04:22 +00001371 return ExprError();
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001372
John McCall129e2df2009-11-30 22:42:35 +00001373 TemplateArgumentListInfo TemplateArgsBuffer;
John McCallf7a1a742009-11-24 19:00:30 +00001374
1375 // Decompose the UnqualifiedId into the following data.
Abramo Bagnara25777432010-08-11 22:01:17 +00001376 DeclarationNameInfo NameInfo;
John McCallf7a1a742009-11-24 19:00:30 +00001377 const TemplateArgumentListInfo *TemplateArgs;
Abramo Bagnara25777432010-08-11 22:01:17 +00001378 DecomposeUnqualifiedId(*this, Id, TemplateArgsBuffer, NameInfo, TemplateArgs);
Douglas Gregor5953d8b2009-03-19 17:26:29 +00001379
Abramo Bagnara25777432010-08-11 22:01:17 +00001380 DeclarationName Name = NameInfo.getName();
Douglas Gregor10c42622008-11-18 15:03:34 +00001381 IdentifierInfo *II = Name.getAsIdentifierInfo();
Abramo Bagnara25777432010-08-11 22:01:17 +00001382 SourceLocation NameLoc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00001383
John McCallf7a1a742009-11-24 19:00:30 +00001384 // C++ [temp.dep.expr]p3:
1385 // An id-expression is type-dependent if it contains:
Douglas Gregor48026d22010-01-11 18:40:55 +00001386 // -- an identifier that was declared with a dependent type,
1387 // (note: handled after lookup)
1388 // -- a template-id that is dependent,
1389 // (note: handled in BuildTemplateIdExpr)
1390 // -- a conversion-function-id that specifies a dependent type,
John McCallf7a1a742009-11-24 19:00:30 +00001391 // -- a nested-name-specifier that contains a class-name that
1392 // names a dependent type.
1393 // Determine whether this is a member of an unknown specialization;
1394 // we need to handle these differently.
Eli Friedman647c8b32010-08-06 23:41:47 +00001395 bool DependentID = false;
1396 if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName &&
1397 Name.getCXXNameType()->isDependentType()) {
1398 DependentID = true;
1399 } else if (SS.isSet()) {
1400 DeclContext *DC = computeDeclContext(SS, false);
1401 if (DC) {
1402 if (RequireCompleteDeclContext(SS, DC))
1403 return ExprError();
1404 // FIXME: We should be checking whether DC is the current instantiation.
1405 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC))
1406 DependentID = !IsFullyFormedScope(*this, RD);
1407 } else {
1408 DependentID = true;
1409 }
1410 }
1411
1412 if (DependentID) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001413 return ActOnDependentIdExpression(SS, NameInfo, isAddressOfOperand,
John McCallf7a1a742009-11-24 19:00:30 +00001414 TemplateArgs);
1415 }
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001416 bool IvarLookupFollowUp = false;
John McCallf7a1a742009-11-24 19:00:30 +00001417 // Perform the required lookup.
Abramo Bagnara25777432010-08-11 22:01:17 +00001418 LookupResult R(*this, NameInfo, LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00001419 if (TemplateArgs) {
Douglas Gregord2235f62010-05-20 20:58:56 +00001420 // Lookup the template name again to correctly establish the context in
1421 // which it was found. This is really unfortunate as we already did the
1422 // lookup to determine that it was a template name in the first place. If
1423 // this becomes a performance hit, we can work harder to preserve those
1424 // results until we get here but it's likely not worth it.
Douglas Gregor1fd6d442010-05-21 23:18:07 +00001425 bool MemberOfUnknownSpecialization;
1426 LookupTemplateName(R, S, SS, QualType(), /*EnteringContext=*/false,
1427 MemberOfUnknownSpecialization);
John McCallf7a1a742009-11-24 19:00:30 +00001428 } else {
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001429 IvarLookupFollowUp = (!SS.isSet() && II && getCurMethodDecl());
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001430 LookupParsedName(R, S, &SS, !IvarLookupFollowUp);
Mike Stump1eb44332009-09-09 15:08:12 +00001431
John McCallf7a1a742009-11-24 19:00:30 +00001432 // If this reference is in an Objective-C method, then we need to do
1433 // some special Objective-C lookup, too.
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001434 if (IvarLookupFollowUp) {
John McCall60d7b3a2010-08-24 06:29:42 +00001435 ExprResult E(LookupInObjCMethod(R, S, II, true));
John McCallf7a1a742009-11-24 19:00:30 +00001436 if (E.isInvalid())
1437 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00001438
John McCallf7a1a742009-11-24 19:00:30 +00001439 Expr *Ex = E.takeAs<Expr>();
1440 if (Ex) return Owned(Ex);
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001441 // Synthesize ivars lazily
1442 if (getLangOptions().ObjCNonFragileABI2) {
Fariborz Jahaniande267602010-11-17 19:41:23 +00001443 if (SynthesizeProvisionalIvar(*this, R, II, NameLoc)) {
1444 if (const ObjCPropertyDecl *Property =
1445 canSynthesizeProvisionalIvar(II)) {
1446 Diag(NameLoc, diag::warn_synthesized_ivar_access) << II;
1447 Diag(Property->getLocation(), diag::note_property_declare);
1448 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001449 return ActOnIdExpression(S, SS, Id, HasTrailingLParen,
1450 isAddressOfOperand);
Fariborz Jahaniande267602010-11-17 19:41:23 +00001451 }
Fariborz Jahanianad51e742010-07-17 00:59:30 +00001452 }
Fariborz Jahanianf759b4d2010-08-13 18:09:39 +00001453 // for further use, this must be set to false if in class method.
1454 IvarLookupFollowUp = getCurMethodDecl()->isInstanceMethod();
Steve Naroffe3e9add2008-06-02 23:03:37 +00001455 }
Chris Lattner8a934232008-03-31 00:36:02 +00001456 }
Douglas Gregorc71e28c2009-02-16 19:28:42 +00001457
John McCallf7a1a742009-11-24 19:00:30 +00001458 if (R.isAmbiguous())
1459 return ExprError();
1460
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001461 // Determine whether this name might be a candidate for
1462 // argument-dependent lookup.
John McCallf7a1a742009-11-24 19:00:30 +00001463 bool ADL = UseArgumentDependentLookup(SS, R, HasTrailingLParen);
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001464
John McCallf7a1a742009-11-24 19:00:30 +00001465 if (R.empty() && !ADL) {
Reid Spencer5f016e22007-07-11 17:01:13 +00001466 // Otherwise, this could be an implicitly declared function reference (legal
John McCallf7a1a742009-11-24 19:00:30 +00001467 // in C90, extension in C99, forbidden in C++).
1468 if (HasTrailingLParen && II && !getLangOptions().CPlusPlus) {
1469 NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *II, S);
1470 if (D) R.addDecl(D);
1471 }
1472
1473 // If this name wasn't predeclared and if this is not a function
1474 // call, diagnose the problem.
1475 if (R.empty()) {
Douglas Gregor91f7ac72010-05-18 16:14:23 +00001476 if (DiagnoseEmptyLookup(S, SS, R, CTC_Unknown))
John McCall578b69b2009-12-16 08:11:27 +00001477 return ExprError();
1478
1479 assert(!R.empty() &&
1480 "DiagnoseEmptyLookup returned false but added no results");
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001481
1482 // If we found an Objective-C instance variable, let
1483 // LookupInObjCMethod build the appropriate expression to
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001484 // reference the ivar.
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001485 if (ObjCIvarDecl *Ivar = R.getAsSingle<ObjCIvarDecl>()) {
1486 R.clear();
John McCall60d7b3a2010-08-24 06:29:42 +00001487 ExprResult E(LookupInObjCMethod(R, S, Ivar->getIdentifier()));
Douglas Gregorf06cdae2010-01-03 18:01:57 +00001488 assert(E.isInvalid() || E.get());
1489 return move(E);
1490 }
Reid Spencer5f016e22007-07-11 17:01:13 +00001491 }
1492 }
Mike Stump1eb44332009-09-09 15:08:12 +00001493
John McCallf7a1a742009-11-24 19:00:30 +00001494 // This is guaranteed from this point on.
1495 assert(!R.empty() || ADL);
1496
1497 if (VarDecl *Var = R.getAsSingle<VarDecl>()) {
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001498 if (getLangOptions().ObjCNonFragileABI && IvarLookupFollowUp &&
Fariborz Jahanianb1d58e32010-07-29 16:53:53 +00001499 !getLangOptions().ObjCNonFragileABI2 &&
1500 Var->isFileVarDecl()) {
Douglas Gregorca45da02010-11-02 20:36:02 +00001501 ObjCPropertyDecl *Property = canSynthesizeProvisionalIvar(II);
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001502 if (Property) {
1503 Diag(NameLoc, diag::warn_ivar_variable_conflict) << Var->getDeclName();
1504 Diag(Property->getLocation(), diag::note_property_declare);
Fariborz Jahanianf759b4d2010-08-13 18:09:39 +00001505 Diag(Var->getLocation(), diag::note_global_declared_at);
Fariborz Jahanian69d56242010-07-22 23:33:21 +00001506 }
1507 }
John McCallf7a1a742009-11-24 19:00:30 +00001508 } else if (FunctionDecl *Func = R.getAsSingle<FunctionDecl>()) {
Douglas Gregor751f9a42009-06-30 15:47:41 +00001509 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) {
1510 // C99 DR 316 says that, if a function type comes from a
1511 // function definition (without a prototype), that type is only
1512 // used for checking compatibility. Therefore, when referencing
1513 // the function, we pretend that we don't have the full function
1514 // type.
John McCallf7a1a742009-11-24 19:00:30 +00001515 if (DiagnoseUseOfDecl(Func, NameLoc))
Douglas Gregor751f9a42009-06-30 15:47:41 +00001516 return ExprError();
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001517
Douglas Gregor751f9a42009-06-30 15:47:41 +00001518 QualType T = Func->getType();
1519 QualType NoProtoType = T;
John McCall183700f2009-09-21 23:43:11 +00001520 if (const FunctionProtoType *Proto = T->getAs<FunctionProtoType>())
Eli Friedman9a0fcfe2010-05-17 02:50:18 +00001521 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType(),
1522 Proto->getExtInfo());
John McCallf89e55a2010-11-18 06:31:45 +00001523 // Note that functions are r-values in C.
1524 return BuildDeclRefExpr(Func, NoProtoType, VK_RValue, NameLoc, &SS);
Douglas Gregor751f9a42009-06-30 15:47:41 +00001525 }
1526 }
Mike Stump1eb44332009-09-09 15:08:12 +00001527
John McCallaa81e162009-12-01 22:10:20 +00001528 // Check whether this might be a C++ implicit instance member access.
John McCallfb97e752010-08-24 22:52:39 +00001529 // C++ [class.mfct.non-static]p3:
1530 // When an id-expression that is not part of a class member access
1531 // syntax and not used to form a pointer to member is used in the
1532 // body of a non-static member function of class X, if name lookup
1533 // resolves the name in the id-expression to a non-static non-type
1534 // member of some class C, the id-expression is transformed into a
1535 // class member access expression using (*this) as the
1536 // postfix-expression to the left of the . operator.
John McCall9c72c602010-08-27 09:08:28 +00001537 //
1538 // But we don't actually need to do this for '&' operands if R
1539 // resolved to a function or overloaded function set, because the
1540 // expression is ill-formed if it actually works out to be a
1541 // non-static member function:
1542 //
1543 // C++ [expr.ref]p4:
1544 // Otherwise, if E1.E2 refers to a non-static member function. . .
1545 // [t]he expression can be used only as the left-hand operand of a
1546 // member function call.
1547 //
1548 // There are other safeguards against such uses, but it's important
1549 // to get this right here so that we don't end up making a
1550 // spuriously dependent expression if we're inside a dependent
1551 // instance method.
John McCall3b4294e2009-12-16 12:17:52 +00001552 if (!R.empty() && (*R.begin())->isCXXClassMember()) {
John McCall9c72c602010-08-27 09:08:28 +00001553 bool MightBeImplicitMember;
1554 if (!isAddressOfOperand)
1555 MightBeImplicitMember = true;
1556 else if (!SS.isEmpty())
1557 MightBeImplicitMember = false;
1558 else if (R.isOverloadedResult())
1559 MightBeImplicitMember = false;
Douglas Gregore2248be2010-08-30 16:00:47 +00001560 else if (R.isUnresolvableResult())
1561 MightBeImplicitMember = true;
John McCall9c72c602010-08-27 09:08:28 +00001562 else
Francois Pichet87c2e122010-11-21 06:08:52 +00001563 MightBeImplicitMember = isa<FieldDecl>(R.getFoundDecl()) ||
1564 isa<IndirectFieldDecl>(R.getFoundDecl());
John McCall9c72c602010-08-27 09:08:28 +00001565
1566 if (MightBeImplicitMember)
John McCall3b4294e2009-12-16 12:17:52 +00001567 return BuildPossibleImplicitMemberExpr(SS, R, TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00001568 }
1569
John McCallf7a1a742009-11-24 19:00:30 +00001570 if (TemplateArgs)
1571 return BuildTemplateIdExpr(SS, R, ADL, *TemplateArgs);
John McCall5b3f9132009-11-22 01:44:31 +00001572
John McCallf7a1a742009-11-24 19:00:30 +00001573 return BuildDeclarationNameExpr(SS, R, ADL);
1574}
1575
John McCall3b4294e2009-12-16 12:17:52 +00001576/// Builds an expression which might be an implicit member expression.
John McCall60d7b3a2010-08-24 06:29:42 +00001577ExprResult
John McCall3b4294e2009-12-16 12:17:52 +00001578Sema::BuildPossibleImplicitMemberExpr(const CXXScopeSpec &SS,
1579 LookupResult &R,
1580 const TemplateArgumentListInfo *TemplateArgs) {
1581 switch (ClassifyImplicitMemberAccess(*this, R)) {
1582 case IMA_Instance:
1583 return BuildImplicitMemberExpr(SS, R, TemplateArgs, true);
1584
John McCall3b4294e2009-12-16 12:17:52 +00001585 case IMA_Mixed:
1586 case IMA_Mixed_Unrelated:
1587 case IMA_Unresolved:
1588 return BuildImplicitMemberExpr(SS, R, TemplateArgs, false);
1589
1590 case IMA_Static:
1591 case IMA_Mixed_StaticContext:
1592 case IMA_Unresolved_StaticContext:
1593 if (TemplateArgs)
1594 return BuildTemplateIdExpr(SS, R, false, *TemplateArgs);
1595 return BuildDeclarationNameExpr(SS, R, false);
1596
1597 case IMA_Error_StaticContext:
1598 case IMA_Error_Unrelated:
1599 DiagnoseInstanceReference(*this, SS, R);
1600 return ExprError();
1601 }
1602
1603 llvm_unreachable("unexpected instance member access kind");
1604 return ExprError();
1605}
1606
John McCall129e2df2009-11-30 22:42:35 +00001607/// BuildQualifiedDeclarationNameExpr - Build a C++ qualified
1608/// declaration name, generally during template instantiation.
1609/// There's a large number of things which don't need to be done along
1610/// this path.
John McCall60d7b3a2010-08-24 06:29:42 +00001611ExprResult
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00001612Sema::BuildQualifiedDeclarationNameExpr(CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00001613 const DeclarationNameInfo &NameInfo) {
John McCallf7a1a742009-11-24 19:00:30 +00001614 DeclContext *DC;
Douglas Gregore6ec5c42010-04-28 07:04:26 +00001615 if (!(DC = computeDeclContext(SS, false)) || DC->isDependentContext())
Abramo Bagnara25777432010-08-11 22:01:17 +00001616 return BuildDependentDeclRefExpr(SS, NameInfo, 0);
John McCallf7a1a742009-11-24 19:00:30 +00001617
John McCall77bb1aa2010-05-01 00:40:08 +00001618 if (RequireCompleteDeclContext(SS, DC))
Douglas Gregore6ec5c42010-04-28 07:04:26 +00001619 return ExprError();
1620
Abramo Bagnara25777432010-08-11 22:01:17 +00001621 LookupResult R(*this, NameInfo, LookupOrdinaryName);
John McCallf7a1a742009-11-24 19:00:30 +00001622 LookupQualifiedName(R, DC);
1623
1624 if (R.isAmbiguous())
1625 return ExprError();
1626
1627 if (R.empty()) {
Abramo Bagnara25777432010-08-11 22:01:17 +00001628 Diag(NameInfo.getLoc(), diag::err_no_member)
1629 << NameInfo.getName() << DC << SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00001630 return ExprError();
1631 }
1632
1633 return BuildDeclarationNameExpr(SS, R, /*ADL*/ false);
1634}
1635
1636/// LookupInObjCMethod - The parser has read a name in, and Sema has
1637/// detected that we're currently inside an ObjC method. Perform some
1638/// additional lookup.
1639///
1640/// Ideally, most of this would be done by lookup, but there's
1641/// actually quite a lot of extra work involved.
1642///
1643/// Returns a null sentinel to indicate trivial success.
John McCall60d7b3a2010-08-24 06:29:42 +00001644ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00001645Sema::LookupInObjCMethod(LookupResult &Lookup, Scope *S,
Chris Lattnereb483eb2010-04-11 08:28:14 +00001646 IdentifierInfo *II, bool AllowBuiltinCreation) {
John McCallf7a1a742009-11-24 19:00:30 +00001647 SourceLocation Loc = Lookup.getNameLoc();
Chris Lattneraec43db2010-04-12 05:10:17 +00001648 ObjCMethodDecl *CurMethod = getCurMethodDecl();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001649
John McCallf7a1a742009-11-24 19:00:30 +00001650 // There are two cases to handle here. 1) scoped lookup could have failed,
1651 // in which case we should look for an ivar. 2) scoped lookup could have
1652 // found a decl, but that decl is outside the current instance method (i.e.
1653 // a global variable). In these two cases, we do a lookup for an ivar with
1654 // this name, if the lookup sucedes, we replace it our current decl.
1655
1656 // If we're in a class method, we don't normally want to look for
1657 // ivars. But if we don't find anything else, and there's an
1658 // ivar, that's an error.
Chris Lattneraec43db2010-04-12 05:10:17 +00001659 bool IsClassMethod = CurMethod->isClassMethod();
John McCallf7a1a742009-11-24 19:00:30 +00001660
1661 bool LookForIvars;
1662 if (Lookup.empty())
1663 LookForIvars = true;
1664 else if (IsClassMethod)
1665 LookForIvars = false;
1666 else
1667 LookForIvars = (Lookup.isSingleResult() &&
1668 Lookup.getFoundDecl()->isDefinedOutsideFunctionOrMethod());
Fariborz Jahanian412e7982010-02-09 19:31:38 +00001669 ObjCInterfaceDecl *IFace = 0;
John McCallf7a1a742009-11-24 19:00:30 +00001670 if (LookForIvars) {
Chris Lattneraec43db2010-04-12 05:10:17 +00001671 IFace = CurMethod->getClassInterface();
John McCallf7a1a742009-11-24 19:00:30 +00001672 ObjCInterfaceDecl *ClassDeclared;
1673 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
1674 // Diagnose using an ivar in a class method.
1675 if (IsClassMethod)
1676 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method)
1677 << IV->getDeclName());
1678
1679 // If we're referencing an invalid decl, just return this as a silent
1680 // error node. The error diagnostic was already emitted on the decl.
1681 if (IV->isInvalidDecl())
1682 return ExprError();
1683
1684 // Check if referencing a field with __attribute__((deprecated)).
1685 if (DiagnoseUseOfDecl(IV, Loc))
1686 return ExprError();
1687
1688 // Diagnose the use of an ivar outside of the declaring class.
1689 if (IV->getAccessControl() == ObjCIvarDecl::Private &&
1690 ClassDeclared != IFace)
1691 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName();
1692
1693 // FIXME: This should use a new expr for a direct reference, don't
1694 // turn this into Self->ivar, just return a BareIVarExpr or something.
1695 IdentifierInfo &II = Context.Idents.get("self");
1696 UnqualifiedId SelfName;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001697 SelfName.setIdentifier(&II, SourceLocation());
John McCallf7a1a742009-11-24 19:00:30 +00001698 CXXScopeSpec SelfScopeSpec;
John McCall60d7b3a2010-08-24 06:29:42 +00001699 ExprResult SelfExpr = ActOnIdExpression(S, SelfScopeSpec,
Douglas Gregore45bb6a2010-09-22 16:33:13 +00001700 SelfName, false, false);
1701 if (SelfExpr.isInvalid())
1702 return ExprError();
1703
John McCallf7a1a742009-11-24 19:00:30 +00001704 MarkDeclarationReferenced(Loc, IV);
1705 return Owned(new (Context)
1706 ObjCIvarRefExpr(IV, IV->getType(), Loc,
1707 SelfExpr.takeAs<Expr>(), true, true));
1708 }
Chris Lattneraec43db2010-04-12 05:10:17 +00001709 } else if (CurMethod->isInstanceMethod()) {
John McCallf7a1a742009-11-24 19:00:30 +00001710 // We should warn if a local variable hides an ivar.
Chris Lattneraec43db2010-04-12 05:10:17 +00001711 ObjCInterfaceDecl *IFace = CurMethod->getClassInterface();
John McCallf7a1a742009-11-24 19:00:30 +00001712 ObjCInterfaceDecl *ClassDeclared;
1713 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) {
1714 if (IV->getAccessControl() != ObjCIvarDecl::Private ||
1715 IFace == ClassDeclared)
1716 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName();
1717 }
1718 }
1719
Fariborz Jahanian48c2d562010-01-12 23:58:59 +00001720 if (Lookup.empty() && II && AllowBuiltinCreation) {
1721 // FIXME. Consolidate this with similar code in LookupName.
1722 if (unsigned BuiltinID = II->getBuiltinID()) {
1723 if (!(getLangOptions().CPlusPlus &&
1724 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))) {
1725 NamedDecl *D = LazilyCreateBuiltin((IdentifierInfo *)II, BuiltinID,
1726 S, Lookup.isForRedeclaration(),
1727 Lookup.getNameLoc());
1728 if (D) Lookup.addDecl(D);
1729 }
1730 }
1731 }
John McCallf7a1a742009-11-24 19:00:30 +00001732 // Sentinel value saying that we didn't do anything special.
1733 return Owned((Expr*) 0);
Douglas Gregor751f9a42009-06-30 15:47:41 +00001734}
John McCallba135432009-11-21 08:51:07 +00001735
John McCall6bb80172010-03-30 21:47:33 +00001736/// \brief Cast a base object to a member's actual type.
1737///
1738/// Logically this happens in three phases:
1739///
1740/// * First we cast from the base type to the naming class.
1741/// The naming class is the class into which we were looking
1742/// when we found the member; it's the qualifier type if a
1743/// qualifier was provided, and otherwise it's the base type.
1744///
1745/// * Next we cast from the naming class to the declaring class.
1746/// If the member we found was brought into a class's scope by
1747/// a using declaration, this is that class; otherwise it's
1748/// the class declaring the member.
1749///
1750/// * Finally we cast from the declaring class to the "true"
1751/// declaring class of the member. This conversion does not
1752/// obey access control.
Fariborz Jahanianf3e53d32009-07-29 19:40:11 +00001753bool
Douglas Gregor5fccd362010-03-03 23:55:11 +00001754Sema::PerformObjectMemberConversion(Expr *&From,
1755 NestedNameSpecifier *Qualifier,
John McCall6bb80172010-03-30 21:47:33 +00001756 NamedDecl *FoundDecl,
Douglas Gregor5fccd362010-03-03 23:55:11 +00001757 NamedDecl *Member) {
1758 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Member->getDeclContext());
1759 if (!RD)
1760 return false;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001761
Douglas Gregor5fccd362010-03-03 23:55:11 +00001762 QualType DestRecordType;
1763 QualType DestType;
1764 QualType FromRecordType;
1765 QualType FromType = From->getType();
1766 bool PointerConversions = false;
1767 if (isa<FieldDecl>(Member)) {
1768 DestRecordType = Context.getCanonicalType(Context.getTypeDeclType(RD));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001769
Douglas Gregor5fccd362010-03-03 23:55:11 +00001770 if (FromType->getAs<PointerType>()) {
1771 DestType = Context.getPointerType(DestRecordType);
1772 FromRecordType = FromType->getPointeeType();
1773 PointerConversions = true;
1774 } else {
1775 DestType = DestRecordType;
1776 FromRecordType = FromType;
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00001777 }
Douglas Gregor5fccd362010-03-03 23:55:11 +00001778 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) {
1779 if (Method->isStatic())
1780 return false;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001781
Douglas Gregor5fccd362010-03-03 23:55:11 +00001782 DestType = Method->getThisType(Context);
1783 DestRecordType = DestType->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001784
Douglas Gregor5fccd362010-03-03 23:55:11 +00001785 if (FromType->getAs<PointerType>()) {
1786 FromRecordType = FromType->getPointeeType();
1787 PointerConversions = true;
1788 } else {
1789 FromRecordType = FromType;
1790 DestType = DestRecordType;
1791 }
1792 } else {
1793 // No conversion necessary.
1794 return false;
1795 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001796
Douglas Gregor5fccd362010-03-03 23:55:11 +00001797 if (DestType->isDependentType() || FromType->isDependentType())
1798 return false;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001799
Douglas Gregor5fccd362010-03-03 23:55:11 +00001800 // If the unqualified types are the same, no conversion is necessary.
1801 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
1802 return false;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001803
John McCall6bb80172010-03-30 21:47:33 +00001804 SourceRange FromRange = From->getSourceRange();
1805 SourceLocation FromLoc = FromRange.getBegin();
1806
John McCall5baba9d2010-08-25 10:28:54 +00001807 ExprValueKind VK = CastCategory(From);
Sebastian Redl906082e2010-07-20 04:20:21 +00001808
Douglas Gregor5fccd362010-03-03 23:55:11 +00001809 // C++ [class.member.lookup]p8:
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001810 // [...] Ambiguities can often be resolved by qualifying a name with its
Douglas Gregor5fccd362010-03-03 23:55:11 +00001811 // class name.
1812 //
1813 // If the member was a qualified name and the qualified referred to a
1814 // specific base subobject type, we'll cast to that intermediate type
1815 // first and then to the object in which the member is declared. That allows
1816 // one to resolve ambiguities in, e.g., a diamond-shaped hierarchy such as:
1817 //
1818 // class Base { public: int x; };
1819 // class Derived1 : public Base { };
1820 // class Derived2 : public Base { };
1821 // class VeryDerived : public Derived1, public Derived2 { void f(); };
1822 //
1823 // void VeryDerived::f() {
1824 // x = 17; // error: ambiguous base subobjects
1825 // Derived1::x = 17; // okay, pick the Base subobject of Derived1
1826 // }
Douglas Gregor5fccd362010-03-03 23:55:11 +00001827 if (Qualifier) {
John McCall6bb80172010-03-30 21:47:33 +00001828 QualType QType = QualType(Qualifier->getAsType(), 0);
1829 assert(!QType.isNull() && "lookup done with dependent qualifier?");
1830 assert(QType->isRecordType() && "lookup done with non-record type");
1831
1832 QualType QRecordType = QualType(QType->getAs<RecordType>(), 0);
1833
1834 // In C++98, the qualifier type doesn't actually have to be a base
1835 // type of the object type, in which case we just ignore it.
1836 // Otherwise build the appropriate casts.
1837 if (IsDerivedFrom(FromRecordType, QRecordType)) {
John McCallf871d0c2010-08-07 06:22:56 +00001838 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00001839 if (CheckDerivedToBaseConversion(FromRecordType, QRecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00001840 FromLoc, FromRange, &BasePath))
John McCall6bb80172010-03-30 21:47:33 +00001841 return true;
1842
Douglas Gregor5fccd362010-03-03 23:55:11 +00001843 if (PointerConversions)
John McCall6bb80172010-03-30 21:47:33 +00001844 QType = Context.getPointerType(QType);
John McCall5baba9d2010-08-25 10:28:54 +00001845 ImpCastExprToType(From, QType, CK_UncheckedDerivedToBase,
1846 VK, &BasePath);
John McCall6bb80172010-03-30 21:47:33 +00001847
1848 FromType = QType;
1849 FromRecordType = QRecordType;
1850
1851 // If the qualifier type was the same as the destination type,
1852 // we're done.
1853 if (Context.hasSameUnqualifiedType(FromRecordType, DestRecordType))
1854 return false;
Douglas Gregor5fccd362010-03-03 23:55:11 +00001855 }
1856 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001857
John McCall6bb80172010-03-30 21:47:33 +00001858 bool IgnoreAccess = false;
Douglas Gregor5fccd362010-03-03 23:55:11 +00001859
John McCall6bb80172010-03-30 21:47:33 +00001860 // If we actually found the member through a using declaration, cast
1861 // down to the using declaration's type.
1862 //
1863 // Pointer equality is fine here because only one declaration of a
1864 // class ever has member declarations.
1865 if (FoundDecl->getDeclContext() != Member->getDeclContext()) {
1866 assert(isa<UsingShadowDecl>(FoundDecl));
1867 QualType URecordType = Context.getTypeDeclType(
1868 cast<CXXRecordDecl>(FoundDecl->getDeclContext()));
1869
1870 // We only need to do this if the naming-class to declaring-class
1871 // conversion is non-trivial.
1872 if (!Context.hasSameUnqualifiedType(FromRecordType, URecordType)) {
1873 assert(IsDerivedFrom(FromRecordType, URecordType));
John McCallf871d0c2010-08-07 06:22:56 +00001874 CXXCastPath BasePath;
John McCall6bb80172010-03-30 21:47:33 +00001875 if (CheckDerivedToBaseConversion(FromRecordType, URecordType,
Anders Carlssoncee22422010-04-24 19:22:20 +00001876 FromLoc, FromRange, &BasePath))
John McCall6bb80172010-03-30 21:47:33 +00001877 return true;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00001878
John McCall6bb80172010-03-30 21:47:33 +00001879 QualType UType = URecordType;
1880 if (PointerConversions)
1881 UType = Context.getPointerType(UType);
John McCall2de56d12010-08-25 11:45:40 +00001882 ImpCastExprToType(From, UType, CK_UncheckedDerivedToBase,
John McCall5baba9d2010-08-25 10:28:54 +00001883 VK, &BasePath);
John McCall6bb80172010-03-30 21:47:33 +00001884 FromType = UType;
1885 FromRecordType = URecordType;
1886 }
1887
1888 // We don't do access control for the conversion from the
1889 // declaring class to the true declaring class.
1890 IgnoreAccess = true;
Douglas Gregor5fccd362010-03-03 23:55:11 +00001891 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001892
John McCallf871d0c2010-08-07 06:22:56 +00001893 CXXCastPath BasePath;
Anders Carlssoncee22422010-04-24 19:22:20 +00001894 if (CheckDerivedToBaseConversion(FromRecordType, DestRecordType,
1895 FromLoc, FromRange, &BasePath,
John McCall6bb80172010-03-30 21:47:33 +00001896 IgnoreAccess))
Douglas Gregor5fccd362010-03-03 23:55:11 +00001897 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00001898
John McCall2de56d12010-08-25 11:45:40 +00001899 ImpCastExprToType(From, DestType, CK_UncheckedDerivedToBase,
John McCall5baba9d2010-08-25 10:28:54 +00001900 VK, &BasePath);
Fariborz Jahanianf3e53d32009-07-29 19:40:11 +00001901 return false;
Fariborz Jahanian98a541e2009-07-29 18:40:24 +00001902}
Douglas Gregor751f9a42009-06-30 15:47:41 +00001903
Douglas Gregor83f6faf2009-08-31 23:41:50 +00001904/// \brief Build a MemberExpr AST node.
Mike Stump1eb44332009-09-09 15:08:12 +00001905static MemberExpr *BuildMemberExpr(ASTContext &C, Expr *Base, bool isArrow,
Eli Friedmanf595cc42009-12-04 06:40:45 +00001906 const CXXScopeSpec &SS, ValueDecl *Member,
John McCall161755a2010-04-06 21:38:20 +00001907 DeclAccessPair FoundDecl,
Abramo Bagnara25777432010-08-11 22:01:17 +00001908 const DeclarationNameInfo &MemberNameInfo,
1909 QualType Ty,
John McCallf89e55a2010-11-18 06:31:45 +00001910 ExprValueKind VK, ExprObjectKind OK,
John McCallf7a1a742009-11-24 19:00:30 +00001911 const TemplateArgumentListInfo *TemplateArgs = 0) {
1912 NestedNameSpecifier *Qualifier = 0;
1913 SourceRange QualifierRange;
John McCall129e2df2009-11-30 22:42:35 +00001914 if (SS.isSet()) {
1915 Qualifier = (NestedNameSpecifier *) SS.getScopeRep();
1916 QualifierRange = SS.getRange();
John McCallf7a1a742009-11-24 19:00:30 +00001917 }
Mike Stump1eb44332009-09-09 15:08:12 +00001918
John McCallf7a1a742009-11-24 19:00:30 +00001919 return MemberExpr::Create(C, Base, isArrow, Qualifier, QualifierRange,
Abramo Bagnara25777432010-08-11 22:01:17 +00001920 Member, FoundDecl, MemberNameInfo,
John McCallf89e55a2010-11-18 06:31:45 +00001921 TemplateArgs, Ty, VK, OK);
Douglas Gregorbd4c4ae2009-08-26 22:36:53 +00001922}
1923
John McCalldfa1edb2010-11-23 20:48:44 +00001924static ExprResult
1925BuildFieldReferenceExpr(Sema &S, Expr *BaseExpr, bool IsArrow,
1926 const CXXScopeSpec &SS, FieldDecl *Field,
1927 DeclAccessPair FoundDecl,
1928 const DeclarationNameInfo &MemberNameInfo) {
1929 // x.a is an l-value if 'a' has a reference type. Otherwise:
1930 // x.a is an l-value/x-value/pr-value if the base is (and note
1931 // that *x is always an l-value), except that if the base isn't
1932 // an ordinary object then we must have an rvalue.
1933 ExprValueKind VK = VK_LValue;
1934 ExprObjectKind OK = OK_Ordinary;
1935 if (!IsArrow) {
1936 if (BaseExpr->getObjectKind() == OK_Ordinary)
1937 VK = BaseExpr->getValueKind();
1938 else
1939 VK = VK_RValue;
1940 }
1941 if (VK != VK_RValue && Field->isBitField())
1942 OK = OK_BitField;
1943
1944 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref]
1945 QualType MemberType = Field->getType();
1946 if (const ReferenceType *Ref = MemberType->getAs<ReferenceType>()) {
1947 MemberType = Ref->getPointeeType();
1948 VK = VK_LValue;
1949 } else {
1950 QualType BaseType = BaseExpr->getType();
1951 if (IsArrow) BaseType = BaseType->getAs<PointerType>()->getPointeeType();
1952
1953 Qualifiers BaseQuals = BaseType.getQualifiers();
1954
1955 // GC attributes are never picked up by members.
1956 BaseQuals.removeObjCGCAttr();
1957
1958 // CVR attributes from the base are picked up by members,
1959 // except that 'mutable' members don't pick up 'const'.
1960 if (Field->isMutable()) BaseQuals.removeConst();
1961
1962 Qualifiers MemberQuals
1963 = S.Context.getCanonicalType(MemberType).getQualifiers();
1964
1965 // TR 18037 does not allow fields to be declared with address spaces.
1966 assert(!MemberQuals.hasAddressSpace());
1967
1968 Qualifiers Combined = BaseQuals + MemberQuals;
1969 if (Combined != MemberQuals)
1970 MemberType = S.Context.getQualifiedType(MemberType, Combined);
1971 }
1972
1973 S.MarkDeclarationReferenced(MemberNameInfo.getLoc(), Field);
1974 if (S.PerformObjectMemberConversion(BaseExpr, SS.getScopeRep(),
1975 FoundDecl, Field))
1976 return ExprError();
1977 return S.Owned(BuildMemberExpr(S.Context, BaseExpr, IsArrow, SS,
1978 Field, FoundDecl, MemberNameInfo,
1979 MemberType, VK, OK));
1980}
1981
John McCallaa81e162009-12-01 22:10:20 +00001982/// Builds an implicit member access expression. The current context
1983/// is known to be an instance method, and the given unqualified lookup
1984/// set is known to contain only instance members, at least one of which
1985/// is from an appropriate type.
John McCall60d7b3a2010-08-24 06:29:42 +00001986ExprResult
John McCallaa81e162009-12-01 22:10:20 +00001987Sema::BuildImplicitMemberExpr(const CXXScopeSpec &SS,
1988 LookupResult &R,
1989 const TemplateArgumentListInfo *TemplateArgs,
1990 bool IsKnownInstance) {
John McCallf7a1a742009-11-24 19:00:30 +00001991 assert(!R.empty() && !R.isAmbiguous());
1992
John McCallba135432009-11-21 08:51:07 +00001993 SourceLocation Loc = R.getNameLoc();
Sebastian Redlebc07d52009-02-03 20:19:35 +00001994
Douglas Gregorbcbffc42009-01-07 00:43:41 +00001995 // We may have found a field within an anonymous union or struct
1996 // (C++ [class.union]).
Douglas Gregore961afb2009-10-22 07:08:30 +00001997 // FIXME: This needs to happen post-isImplicitMemberReference?
John McCallf7a1a742009-11-24 19:00:30 +00001998 // FIXME: template-ids inside anonymous structs?
Francois Pichet87c2e122010-11-21 06:08:52 +00001999 if (IndirectFieldDecl *FD = R.getAsSingle<IndirectFieldDecl>())
2000 return BuildAnonymousStructUnionMemberReference(Loc, FD);
2001
Sebastian Redlcd965b92009-01-18 18:53:16 +00002002
John McCallaa81e162009-12-01 22:10:20 +00002003 // If this is known to be an instance access, go ahead and build a
2004 // 'this' expression now.
John McCallea1471e2010-05-20 01:18:31 +00002005 DeclContext *DC = getFunctionLevelDeclContext();
2006 QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(Context);
John McCallaa81e162009-12-01 22:10:20 +00002007 Expr *This = 0; // null signifies implicit access
2008 if (IsKnownInstance) {
Douglas Gregor828a1972010-01-07 23:12:05 +00002009 SourceLocation Loc = R.getNameLoc();
2010 if (SS.getRange().isValid())
2011 Loc = SS.getRange().getBegin();
2012 This = new (Context) CXXThisExpr(Loc, ThisType, /*isImplicit=*/true);
Douglas Gregor88a35142008-12-22 05:46:06 +00002013 }
2014
John McCall9ae2f072010-08-23 23:25:46 +00002015 return BuildMemberReferenceExpr(This, ThisType,
John McCallaa81e162009-12-01 22:10:20 +00002016 /*OpLoc*/ SourceLocation(),
2017 /*IsArrow*/ true,
John McCallc2233c52010-01-15 08:34:02 +00002018 SS,
2019 /*FirstQualifierInScope*/ 0,
2020 R, TemplateArgs);
John McCallba135432009-11-21 08:51:07 +00002021}
2022
John McCallf7a1a742009-11-24 19:00:30 +00002023bool Sema::UseArgumentDependentLookup(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002024 const LookupResult &R,
2025 bool HasTrailingLParen) {
John McCallba135432009-11-21 08:51:07 +00002026 // Only when used directly as the postfix-expression of a call.
2027 if (!HasTrailingLParen)
2028 return false;
2029
2030 // Never if a scope specifier was provided.
John McCallf7a1a742009-11-24 19:00:30 +00002031 if (SS.isSet())
John McCallba135432009-11-21 08:51:07 +00002032 return false;
2033
2034 // Only in C++ or ObjC++.
John McCall5b3f9132009-11-22 01:44:31 +00002035 if (!getLangOptions().CPlusPlus)
John McCallba135432009-11-21 08:51:07 +00002036 return false;
2037
2038 // Turn off ADL when we find certain kinds of declarations during
2039 // normal lookup:
2040 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
2041 NamedDecl *D = *I;
2042
2043 // C++0x [basic.lookup.argdep]p3:
2044 // -- a declaration of a class member
2045 // Since using decls preserve this property, we check this on the
2046 // original decl.
John McCall3b4294e2009-12-16 12:17:52 +00002047 if (D->isCXXClassMember())
John McCallba135432009-11-21 08:51:07 +00002048 return false;
2049
2050 // C++0x [basic.lookup.argdep]p3:
2051 // -- a block-scope function declaration that is not a
2052 // using-declaration
2053 // NOTE: we also trigger this for function templates (in fact, we
2054 // don't check the decl type at all, since all other decl types
2055 // turn off ADL anyway).
2056 if (isa<UsingShadowDecl>(D))
2057 D = cast<UsingShadowDecl>(D)->getTargetDecl();
2058 else if (D->getDeclContext()->isFunctionOrMethod())
2059 return false;
2060
2061 // C++0x [basic.lookup.argdep]p3:
2062 // -- a declaration that is neither a function or a function
2063 // template
2064 // And also for builtin functions.
2065 if (isa<FunctionDecl>(D)) {
2066 FunctionDecl *FDecl = cast<FunctionDecl>(D);
2067
2068 // But also builtin functions.
2069 if (FDecl->getBuiltinID() && FDecl->isImplicit())
2070 return false;
2071 } else if (!isa<FunctionTemplateDecl>(D))
2072 return false;
2073 }
2074
2075 return true;
2076}
2077
2078
John McCallba135432009-11-21 08:51:07 +00002079/// Diagnoses obvious problems with the use of the given declaration
2080/// as an expression. This is only actually called for lookups that
2081/// were not overloaded, and it doesn't promise that the declaration
2082/// will in fact be used.
2083static bool CheckDeclInExpr(Sema &S, SourceLocation Loc, NamedDecl *D) {
2084 if (isa<TypedefDecl>(D)) {
2085 S.Diag(Loc, diag::err_unexpected_typedef) << D->getDeclName();
2086 return true;
2087 }
2088
2089 if (isa<ObjCInterfaceDecl>(D)) {
2090 S.Diag(Loc, diag::err_unexpected_interface) << D->getDeclName();
2091 return true;
2092 }
2093
2094 if (isa<NamespaceDecl>(D)) {
2095 S.Diag(Loc, diag::err_unexpected_namespace) << D->getDeclName();
2096 return true;
2097 }
2098
2099 return false;
2100}
2101
John McCall60d7b3a2010-08-24 06:29:42 +00002102ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002103Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
John McCall5b3f9132009-11-22 01:44:31 +00002104 LookupResult &R,
2105 bool NeedsADL) {
John McCallfead20c2009-12-08 22:45:53 +00002106 // If this is a single, fully-resolved result and we don't need ADL,
2107 // just build an ordinary singleton decl ref.
Douglas Gregor86b8e092010-01-29 17:15:43 +00002108 if (!NeedsADL && R.isSingleResult() && !R.getAsSingle<FunctionTemplateDecl>())
Abramo Bagnara25777432010-08-11 22:01:17 +00002109 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(),
2110 R.getFoundDecl());
John McCallba135432009-11-21 08:51:07 +00002111
2112 // We only need to check the declaration if there's exactly one
2113 // result, because in the overloaded case the results can only be
2114 // functions and function templates.
John McCall5b3f9132009-11-22 01:44:31 +00002115 if (R.isSingleResult() &&
2116 CheckDeclInExpr(*this, R.getNameLoc(), R.getFoundDecl()))
John McCallba135432009-11-21 08:51:07 +00002117 return ExprError();
2118
John McCallc373d482010-01-27 01:50:18 +00002119 // Otherwise, just build an unresolved lookup expression. Suppress
2120 // any lookup-related diagnostics; we'll hash these out later, when
2121 // we've picked a target.
2122 R.suppressDiagnostics();
2123
John McCallf7a1a742009-11-24 19:00:30 +00002124 bool Dependent
2125 = UnresolvedLookupExpr::ComputeDependence(R.begin(), R.end(), 0);
John McCallba135432009-11-21 08:51:07 +00002126 UnresolvedLookupExpr *ULE
John McCallc373d482010-01-27 01:50:18 +00002127 = UnresolvedLookupExpr::Create(Context, Dependent, R.getNamingClass(),
John McCallf7a1a742009-11-24 19:00:30 +00002128 (NestedNameSpecifier*) SS.getScopeRep(),
Abramo Bagnara25777432010-08-11 22:01:17 +00002129 SS.getRange(), R.getLookupNameInfo(),
Douglas Gregor5a84dec2010-05-23 18:57:34 +00002130 NeedsADL, R.isOverloadedResult(),
2131 R.begin(), R.end());
John McCallba135432009-11-21 08:51:07 +00002132
2133 return Owned(ULE);
2134}
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002135
John McCallf89e55a2010-11-18 06:31:45 +00002136static ExprValueKind getValueKindForDecl(ASTContext &Context,
2137 const ValueDecl *D) {
John McCall09431682010-11-18 19:01:18 +00002138 // FIXME: It's not clear to me why NonTypeTemplateParmDecl is a VarDecl.
2139 if (isa<VarDecl>(D) && !isa<NonTypeTemplateParmDecl>(D)) return VK_LValue;
2140 if (isa<FieldDecl>(D)) return VK_LValue;
John McCallf89e55a2010-11-18 06:31:45 +00002141 if (!Context.getLangOptions().CPlusPlus) return VK_RValue;
2142 if (isa<FunctionDecl>(D)) {
2143 if (isa<CXXMethodDecl>(D) && cast<CXXMethodDecl>(D)->isInstance())
2144 return VK_RValue;
2145 return VK_LValue;
2146 }
2147 return Expr::getValueKindForType(D->getType());
2148}
2149
John McCallba135432009-11-21 08:51:07 +00002150
2151/// \brief Complete semantic analysis for a reference to the given declaration.
John McCall60d7b3a2010-08-24 06:29:42 +00002152ExprResult
John McCallf7a1a742009-11-24 19:00:30 +00002153Sema::BuildDeclarationNameExpr(const CXXScopeSpec &SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00002154 const DeclarationNameInfo &NameInfo,
2155 NamedDecl *D) {
John McCallba135432009-11-21 08:51:07 +00002156 assert(D && "Cannot refer to a NULL declaration");
John McCall7453ed42009-11-22 00:44:51 +00002157 assert(!isa<FunctionTemplateDecl>(D) &&
2158 "Cannot refer unambiguously to a function template");
John McCallba135432009-11-21 08:51:07 +00002159
Abramo Bagnara25777432010-08-11 22:01:17 +00002160 SourceLocation Loc = NameInfo.getLoc();
John McCallba135432009-11-21 08:51:07 +00002161 if (CheckDeclInExpr(*this, Loc, D))
2162 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002163
Douglas Gregor9af2f522009-12-01 16:58:18 +00002164 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) {
2165 // Specifically diagnose references to class templates that are missing
2166 // a template argument list.
2167 Diag(Loc, diag::err_template_decl_ref)
2168 << Template << SS.getRange();
2169 Diag(Template->getLocation(), diag::note_template_decl_here);
2170 return ExprError();
2171 }
2172
2173 // Make sure that we're referring to a value.
2174 ValueDecl *VD = dyn_cast<ValueDecl>(D);
2175 if (!VD) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002176 Diag(Loc, diag::err_ref_non_value)
Douglas Gregor9af2f522009-12-01 16:58:18 +00002177 << D << SS.getRange();
John McCall87cf6702009-12-18 18:35:10 +00002178 Diag(D->getLocation(), diag::note_declared_at);
Douglas Gregor9af2f522009-12-01 16:58:18 +00002179 return ExprError();
2180 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002181
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002182 // Check whether this declaration can be used. Note that we suppress
2183 // this check when we're going to perform argument-dependent lookup
2184 // on this function name, because this might not be the function
2185 // that overload resolution actually selects.
John McCallba135432009-11-21 08:51:07 +00002186 if (DiagnoseUseOfDecl(VD, Loc))
Douglas Gregor48f3bb92009-02-18 21:56:37 +00002187 return ExprError();
2188
Steve Naroffdd972f22008-09-05 22:11:13 +00002189 // Only create DeclRefExpr's for valid Decl's.
2190 if (VD->isInvalidDecl())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002191 return ExprError();
2192
Francois Pichet87c2e122010-11-21 06:08:52 +00002193 // Handle anonymous.
2194 if (IndirectFieldDecl *FD = dyn_cast<IndirectFieldDecl>(VD))
2195 return BuildAnonymousStructUnionMemberReference(Loc, FD);
2196
John McCallf89e55a2010-11-18 06:31:45 +00002197 ExprValueKind VK = getValueKindForDecl(Context, VD);
2198
Chris Lattner639e2d32008-10-20 05:16:36 +00002199 // If the identifier reference is inside a block, and it refers to a value
2200 // that is outside the block, create a BlockDeclRefExpr instead of a
2201 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when
2202 // the block is formed.
Steve Naroffdd972f22008-09-05 22:11:13 +00002203 //
Chris Lattner639e2d32008-10-20 05:16:36 +00002204 // We do not do this for things like enum constants, global variables, etc,
2205 // as they do not get snapshotted.
2206 //
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002207 if (getCurBlock() &&
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00002208 ShouldSnapshotBlockValueReference(*this, getCurBlock(), VD)) {
Mike Stump0d6fd572010-01-05 02:56:35 +00002209 if (VD->getType().getTypePtr()->isVariablyModifiedType()) {
2210 Diag(Loc, diag::err_ref_vm_type);
2211 Diag(D->getLocation(), diag::note_declared_at);
2212 return ExprError();
2213 }
2214
Fariborz Jahanian8596bbe2010-03-16 23:39:51 +00002215 if (VD->getType()->isArrayType()) {
Mike Stump28497342010-01-05 03:10:36 +00002216 Diag(Loc, diag::err_ref_array_type);
2217 Diag(D->getLocation(), diag::note_declared_at);
2218 return ExprError();
2219 }
2220
Douglas Gregore0762c92009-06-19 23:52:42 +00002221 MarkDeclarationReferenced(Loc, VD);
Eli Friedman5fdeae12009-03-22 23:00:19 +00002222 QualType ExprTy = VD->getType().getNonReferenceType();
John McCallf89e55a2010-11-18 06:31:45 +00002223
Steve Naroff090276f2008-10-10 01:28:17 +00002224 // The BlocksAttr indicates the variable is bound by-reference.
Fariborz Jahaniane2204552010-11-16 19:29:39 +00002225 bool byrefVar = (VD->getAttr<BlocksAttr>() != 0);
Fariborz Jahanian52bc56a2010-07-12 17:26:57 +00002226 QualType T = VD->getType();
Fariborz Jahaniane2204552010-11-16 19:29:39 +00002227 BlockDeclRefExpr *BDRE;
2228
2229 if (!byrefVar) {
2230 // This is to record that a 'const' was actually synthesize and added.
2231 bool constAdded = !ExprTy.isConstQualified();
2232 // Variable will be bound by-copy, make it const within the closure.
2233 ExprTy.addConst();
John McCallf89e55a2010-11-18 06:31:45 +00002234 BDRE = new (Context) BlockDeclRefExpr(VD, ExprTy, VK,
2235 Loc, false, constAdded);
Fariborz Jahaniane2204552010-11-16 19:29:39 +00002236 }
2237 else
John McCallf89e55a2010-11-18 06:31:45 +00002238 BDRE = new (Context) BlockDeclRefExpr(VD, ExprTy, VK, Loc, true);
Fariborz Jahaniane2204552010-11-16 19:29:39 +00002239
Fariborz Jahanian833f42e2010-07-09 22:21:32 +00002240 if (getLangOptions().CPlusPlus) {
2241 if (!T->isDependentType() && !T->isReferenceType()) {
2242 Expr *E = new (Context)
2243 DeclRefExpr(const_cast<ValueDecl*>(BDRE->getDecl()), T,
John McCallf89e55a2010-11-18 06:31:45 +00002244 VK, SourceLocation());
Fariborz Jahaniane27e9d62010-11-11 00:11:38 +00002245 if (T->getAs<RecordType>())
2246 if (!T->isUnionType()) {
2247 ExprResult Res = PerformCopyInitialization(
Fariborz Jahanian833f42e2010-07-09 22:21:32 +00002248 InitializedEntity::InitializeBlock(VD->getLocation(),
Fariborz Jahanian310b1c42010-06-07 16:14:00 +00002249 T, false),
Fariborz Jahanian833f42e2010-07-09 22:21:32 +00002250 SourceLocation(),
2251 Owned(E));
Fariborz Jahaniane27e9d62010-11-11 00:11:38 +00002252 if (!Res.isInvalid()) {
2253 Res = MaybeCreateCXXExprWithTemporaries(Res.get());
2254 Expr *Init = Res.takeAs<Expr>();
2255 BDRE->setCopyConstructorExpr(Init);
2256 }
Fariborz Jahanian833f42e2010-07-09 22:21:32 +00002257 }
Fariborz Jahanian59da45a2010-06-04 21:35:44 +00002258 }
2259 }
2260 return Owned(BDRE);
Steve Naroff090276f2008-10-10 01:28:17 +00002261 }
2262 // If this reference is not in a block or if the referenced variable is
2263 // within the block, create a normal DeclRefExpr.
Douglas Gregor898574e2008-12-05 23:32:09 +00002264
John McCallf89e55a2010-11-18 06:31:45 +00002265 return BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), VK,
Abramo Bagnara25777432010-08-11 22:01:17 +00002266 NameInfo, &SS);
Reid Spencer5f016e22007-07-11 17:01:13 +00002267}
2268
John McCall60d7b3a2010-08-24 06:29:42 +00002269ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc,
Sebastian Redlcd965b92009-01-18 18:53:16 +00002270 tok::TokenKind Kind) {
Chris Lattnerd9f69102008-08-10 01:53:14 +00002271 PredefinedExpr::IdentType IT;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002272
Reid Spencer5f016e22007-07-11 17:01:13 +00002273 switch (Kind) {
Chris Lattner1423ea42008-01-12 18:39:25 +00002274 default: assert(0 && "Unknown simple primary expr!");
Chris Lattnerd9f69102008-08-10 01:53:14 +00002275 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2]
2276 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break;
2277 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00002278 }
Chris Lattner1423ea42008-01-12 18:39:25 +00002279
Chris Lattnerfa28b302008-01-12 08:14:25 +00002280 // Pre-defined identifiers are of type char[x], where x is the length of the
2281 // string.
Mike Stump1eb44332009-09-09 15:08:12 +00002282
Anders Carlsson3a082d82009-09-08 18:24:21 +00002283 Decl *currentDecl = getCurFunctionOrMethodDecl();
Fariborz Jahanianeb024ac2010-07-23 21:53:24 +00002284 if (!currentDecl && getCurBlock())
2285 currentDecl = getCurBlock()->TheDecl;
Anders Carlsson3a082d82009-09-08 18:24:21 +00002286 if (!currentDecl) {
Chris Lattnerb0da9232008-12-12 05:05:20 +00002287 Diag(Loc, diag::ext_predef_outside_function);
Anders Carlsson3a082d82009-09-08 18:24:21 +00002288 currentDecl = Context.getTranslationUnitDecl();
Chris Lattnerb0da9232008-12-12 05:05:20 +00002289 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002290
Anders Carlsson773f3972009-09-11 01:22:35 +00002291 QualType ResTy;
2292 if (cast<DeclContext>(currentDecl)->isDependentContext()) {
2293 ResTy = Context.DependentTy;
2294 } else {
Anders Carlsson848fa642010-02-11 18:20:28 +00002295 unsigned Length = PredefinedExpr::ComputeName(IT, currentDecl).length();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002296
Anders Carlsson773f3972009-09-11 01:22:35 +00002297 llvm::APInt LengthI(32, Length + 1);
John McCall0953e762009-09-24 19:53:00 +00002298 ResTy = Context.CharTy.withConst();
Anders Carlsson773f3972009-09-11 01:22:35 +00002299 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0);
2300 }
Steve Naroff6ece14c2009-01-21 00:14:39 +00002301 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT));
Reid Spencer5f016e22007-07-11 17:01:13 +00002302}
2303
John McCall60d7b3a2010-08-24 06:29:42 +00002304ExprResult Sema::ActOnCharacterConstant(const Token &Tok) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002305 llvm::SmallString<16> CharBuffer;
Douglas Gregor453091c2010-03-16 22:30:13 +00002306 bool Invalid = false;
2307 llvm::StringRef ThisTok = PP.getSpelling(Tok, CharBuffer, &Invalid);
2308 if (Invalid)
2309 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002310
Benjamin Kramerddeea562010-02-27 13:44:12 +00002311 CharLiteralParser Literal(ThisTok.begin(), ThisTok.end(), Tok.getLocation(),
2312 PP);
Reid Spencer5f016e22007-07-11 17:01:13 +00002313 if (Literal.hadError())
Sebastian Redlcd965b92009-01-18 18:53:16 +00002314 return ExprError();
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002315
Chris Lattnere8337df2009-12-30 21:19:39 +00002316 QualType Ty;
2317 if (!getLangOptions().CPlusPlus)
2318 Ty = Context.IntTy; // 'x' and L'x' -> int in C.
2319 else if (Literal.isWide())
2320 Ty = Context.WCharTy; // L'x' -> wchar_t in C++.
Eli Friedman136b0cd2010-02-03 18:21:45 +00002321 else if (Literal.isMultiChar())
2322 Ty = Context.IntTy; // 'wxyz' -> int in C++.
Chris Lattnere8337df2009-12-30 21:19:39 +00002323 else
2324 Ty = Context.CharTy; // 'x' -> char in C++
Chris Lattnerfc62bfd2008-03-01 08:32:21 +00002325
Sebastian Redle91b3bc2009-01-20 22:23:13 +00002326 return Owned(new (Context) CharacterLiteral(Literal.getValue(),
2327 Literal.isWide(),
Chris Lattnere8337df2009-12-30 21:19:39 +00002328 Ty, Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002329}
2330
John McCall60d7b3a2010-08-24 06:29:42 +00002331ExprResult Sema::ActOnNumericConstant(const Token &Tok) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002332 // Fast path for a single digit (which is quite common). A single digit
Reid Spencer5f016e22007-07-11 17:01:13 +00002333 // cannot have a trigraph, escaped newline, radix prefix, or type suffix.
2334 if (Tok.getLength() == 1) {
Chris Lattner7216dc92009-01-26 22:36:52 +00002335 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok);
Chris Lattner0c21e842009-01-16 07:10:29 +00002336 unsigned IntSize = Context.Target.getIntWidth();
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002337 return Owned(IntegerLiteral::Create(Context, llvm::APInt(IntSize, Val-'0'),
Steve Naroff0a473932009-01-20 19:53:53 +00002338 Context.IntTy, Tok.getLocation()));
Reid Spencer5f016e22007-07-11 17:01:13 +00002339 }
Ted Kremenek28396602009-01-13 23:19:12 +00002340
Reid Spencer5f016e22007-07-11 17:01:13 +00002341 llvm::SmallString<512> IntegerBuffer;
Chris Lattner2a299042008-09-30 20:53:45 +00002342 // Add padding so that NumericLiteralParser can overread by one character.
2343 IntegerBuffer.resize(Tok.getLength()+1);
Reid Spencer5f016e22007-07-11 17:01:13 +00002344 const char *ThisTokBegin = &IntegerBuffer[0];
Sebastian Redlcd965b92009-01-18 18:53:16 +00002345
Reid Spencer5f016e22007-07-11 17:01:13 +00002346 // Get the spelling of the token, which eliminates trigraphs, etc.
Douglas Gregor453091c2010-03-16 22:30:13 +00002347 bool Invalid = false;
2348 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin, &Invalid);
2349 if (Invalid)
2350 return ExprError();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002351
Mike Stump1eb44332009-09-09 15:08:12 +00002352 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength,
Reid Spencer5f016e22007-07-11 17:01:13 +00002353 Tok.getLocation(), PP);
2354 if (Literal.hadError)
Sebastian Redlcd965b92009-01-18 18:53:16 +00002355 return ExprError();
2356
Chris Lattner5d661452007-08-26 03:42:43 +00002357 Expr *Res;
Sebastian Redlcd965b92009-01-18 18:53:16 +00002358
Chris Lattner5d661452007-08-26 03:42:43 +00002359 if (Literal.isFloatingLiteral()) {
Chris Lattner525a0502007-09-22 18:29:59 +00002360 QualType Ty;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002361 if (Literal.isFloat)
Chris Lattner525a0502007-09-22 18:29:59 +00002362 Ty = Context.FloatTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002363 else if (!Literal.isLong)
Chris Lattner525a0502007-09-22 18:29:59 +00002364 Ty = Context.DoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002365 else
Chris Lattner9e9b6dc2008-03-08 08:52:55 +00002366 Ty = Context.LongDoubleTy;
Chris Lattnerb7cfe882008-06-30 18:32:54 +00002367
2368 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty);
2369
John McCall94c939d2009-12-24 09:08:04 +00002370 using llvm::APFloat;
2371 APFloat Val(Format);
2372
2373 APFloat::opStatus result = Literal.GetFloatValue(Val);
John McCall9f2df882009-12-24 11:09:08 +00002374
2375 // Overflow is always an error, but underflow is only an error if
2376 // we underflowed to zero (APFloat reports denormals as underflow).
2377 if ((result & APFloat::opOverflow) ||
2378 ((result & APFloat::opUnderflow) && Val.isZero())) {
John McCall94c939d2009-12-24 09:08:04 +00002379 unsigned diagnostic;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00002380 llvm::SmallString<20> buffer;
John McCall94c939d2009-12-24 09:08:04 +00002381 if (result & APFloat::opOverflow) {
John McCall2a0d7572010-02-26 23:35:57 +00002382 diagnostic = diag::warn_float_overflow;
John McCall94c939d2009-12-24 09:08:04 +00002383 APFloat::getLargest(Format).toString(buffer);
2384 } else {
John McCall2a0d7572010-02-26 23:35:57 +00002385 diagnostic = diag::warn_float_underflow;
John McCall94c939d2009-12-24 09:08:04 +00002386 APFloat::getSmallest(Format).toString(buffer);
2387 }
2388
2389 Diag(Tok.getLocation(), diagnostic)
2390 << Ty
2391 << llvm::StringRef(buffer.data(), buffer.size());
2392 }
2393
2394 bool isExact = (result == APFloat::opOK);
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002395 Res = FloatingLiteral::Create(Context, Val, isExact, Ty, Tok.getLocation());
Sebastian Redlcd965b92009-01-18 18:53:16 +00002396
Chris Lattner5d661452007-08-26 03:42:43 +00002397 } else if (!Literal.isIntegerLiteral()) {
Sebastian Redlcd965b92009-01-18 18:53:16 +00002398 return ExprError();
Chris Lattner5d661452007-08-26 03:42:43 +00002399 } else {
Chris Lattnerf0467b32008-04-02 04:24:33 +00002400 QualType Ty;
Reid Spencer5f016e22007-07-11 17:01:13 +00002401
Neil Boothb9449512007-08-29 22:00:19 +00002402 // long long is a C99 feature.
2403 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x &&
Neil Booth79859c32007-08-29 22:13:52 +00002404 Literal.isLongLong)
Neil Boothb9449512007-08-29 22:00:19 +00002405 Diag(Tok.getLocation(), diag::ext_longlong);
2406
Reid Spencer5f016e22007-07-11 17:01:13 +00002407 // Get the value in the widest-possible width.
Chris Lattner98be4942008-03-05 18:54:05 +00002408 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0);
Sebastian Redlcd965b92009-01-18 18:53:16 +00002409
Reid Spencer5f016e22007-07-11 17:01:13 +00002410 if (Literal.GetIntegerValue(ResultVal)) {
2411 // If this value didn't fit into uintmax_t, warn and force to ull.
2412 Diag(Tok.getLocation(), diag::warn_integer_too_large);
Chris Lattnerf0467b32008-04-02 04:24:33 +00002413 Ty = Context.UnsignedLongLongTy;
2414 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() &&
Chris Lattner98be4942008-03-05 18:54:05 +00002415 "long long is not intmax_t?");
Reid Spencer5f016e22007-07-11 17:01:13 +00002416 } else {
2417 // If this value fits into a ULL, try to figure out what else it fits into
2418 // according to the rules of C99 6.4.4.1p5.
Sebastian Redlcd965b92009-01-18 18:53:16 +00002419
Reid Spencer5f016e22007-07-11 17:01:13 +00002420 // Octal, Hexadecimal, and integers with a U suffix are allowed to
2421 // be an unsigned int.
2422 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10;
2423
2424 // Check from smallest to largest, picking the smallest type we can.
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002425 unsigned Width = 0;
Chris Lattner97c51562007-08-23 21:58:08 +00002426 if (!Literal.isLong && !Literal.isLongLong) {
2427 // Are int/unsigned possibilities?
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002428 unsigned IntSize = Context.Target.getIntWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002429
Reid Spencer5f016e22007-07-11 17:01:13 +00002430 // Does it fit in a unsigned int?
2431 if (ResultVal.isIntN(IntSize)) {
2432 // Does it fit in a signed int?
2433 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002434 Ty = Context.IntTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002435 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002436 Ty = Context.UnsignedIntTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002437 Width = IntSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002438 }
Reid Spencer5f016e22007-07-11 17:01:13 +00002439 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002440
Reid Spencer5f016e22007-07-11 17:01:13 +00002441 // Are long/unsigned long possibilities?
Chris Lattnerf0467b32008-04-02 04:24:33 +00002442 if (Ty.isNull() && !Literal.isLongLong) {
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002443 unsigned LongSize = Context.Target.getLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002444
Reid Spencer5f016e22007-07-11 17:01:13 +00002445 // Does it fit in a unsigned long?
2446 if (ResultVal.isIntN(LongSize)) {
2447 // Does it fit in a signed long?
2448 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002449 Ty = Context.LongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002450 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002451 Ty = Context.UnsignedLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002452 Width = LongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002453 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002454 }
2455
Reid Spencer5f016e22007-07-11 17:01:13 +00002456 // Finally, check long long if needed.
Chris Lattnerf0467b32008-04-02 04:24:33 +00002457 if (Ty.isNull()) {
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002458 unsigned LongLongSize = Context.Target.getLongLongWidth();
Sebastian Redlcd965b92009-01-18 18:53:16 +00002459
Reid Spencer5f016e22007-07-11 17:01:13 +00002460 // Does it fit in a unsigned long long?
2461 if (ResultVal.isIntN(LongLongSize)) {
2462 // Does it fit in a signed long long?
2463 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002464 Ty = Context.LongLongTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00002465 else if (AllowUnsigned)
Chris Lattnerf0467b32008-04-02 04:24:33 +00002466 Ty = Context.UnsignedLongLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002467 Width = LongLongSize;
Reid Spencer5f016e22007-07-11 17:01:13 +00002468 }
2469 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002470
Reid Spencer5f016e22007-07-11 17:01:13 +00002471 // If we still couldn't decide a type, we probably have something that
2472 // does not fit in a signed long long, but has no U suffix.
Chris Lattnerf0467b32008-04-02 04:24:33 +00002473 if (Ty.isNull()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002474 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed);
Chris Lattnerf0467b32008-04-02 04:24:33 +00002475 Ty = Context.UnsignedLongLongTy;
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002476 Width = Context.Target.getLongLongWidth();
Reid Spencer5f016e22007-07-11 17:01:13 +00002477 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002478
Chris Lattner8cbcb0e2008-05-09 05:59:00 +00002479 if (ResultVal.getBitWidth() != Width)
2480 ResultVal.trunc(Width);
Reid Spencer5f016e22007-07-11 17:01:13 +00002481 }
Argyrios Kyrtzidis9996a7f2010-08-28 09:06:06 +00002482 Res = IntegerLiteral::Create(Context, ResultVal, Ty, Tok.getLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +00002483 }
Sebastian Redlcd965b92009-01-18 18:53:16 +00002484
Chris Lattner5d661452007-08-26 03:42:43 +00002485 // If this is an imaginary literal, create the ImaginaryLiteral wrapper.
2486 if (Literal.isImaginary)
Mike Stump1eb44332009-09-09 15:08:12 +00002487 Res = new (Context) ImaginaryLiteral(Res,
Steve Naroff6ece14c2009-01-21 00:14:39 +00002488 Context.getComplexType(Res->getType()));
Sebastian Redlcd965b92009-01-18 18:53:16 +00002489
2490 return Owned(Res);
Reid Spencer5f016e22007-07-11 17:01:13 +00002491}
2492
John McCall60d7b3a2010-08-24 06:29:42 +00002493ExprResult Sema::ActOnParenExpr(SourceLocation L,
John McCall9ae2f072010-08-23 23:25:46 +00002494 SourceLocation R, Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00002495 assert((E != 0) && "ActOnParenExpr() missing expr");
Steve Naroff6ece14c2009-01-21 00:14:39 +00002496 return Owned(new (Context) ParenExpr(L, R, E));
Reid Spencer5f016e22007-07-11 17:01:13 +00002497}
2498
2499/// The UsualUnaryConversions() function is *not* called by this routine.
2500/// See C99 6.3.2.1p[2-4] for more details.
Sebastian Redl28507842009-02-26 14:39:58 +00002501bool Sema::CheckSizeOfAlignOfOperand(QualType exprType,
Sebastian Redl05189992008-11-11 17:56:53 +00002502 SourceLocation OpLoc,
John McCall2a984ca2010-10-12 00:20:44 +00002503 SourceRange ExprRange,
Sebastian Redl05189992008-11-11 17:56:53 +00002504 bool isSizeof) {
Sebastian Redl28507842009-02-26 14:39:58 +00002505 if (exprType->isDependentType())
2506 return false;
2507
Sebastian Redl5d484e82009-11-23 17:18:46 +00002508 // C++ [expr.sizeof]p2: "When applied to a reference or a reference type,
2509 // the result is the size of the referenced type."
2510 // C++ [expr.alignof]p3: "When alignof is applied to a reference type, the
2511 // result shall be the alignment of the referenced type."
2512 if (const ReferenceType *Ref = exprType->getAs<ReferenceType>())
2513 exprType = Ref->getPointeeType();
2514
Reid Spencer5f016e22007-07-11 17:01:13 +00002515 // C99 6.5.3.4p1:
John McCall5ab75172009-11-04 07:28:41 +00002516 if (exprType->isFunctionType()) {
Chris Lattner1efaa952009-04-24 00:30:45 +00002517 // alignof(function) is allowed as an extension.
Chris Lattner01072922009-01-24 19:46:37 +00002518 if (isSizeof)
2519 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange;
2520 return false;
2521 }
Mike Stump1eb44332009-09-09 15:08:12 +00002522
Chris Lattner1efaa952009-04-24 00:30:45 +00002523 // Allow sizeof(void)/alignof(void) as an extension.
Chris Lattner01072922009-01-24 19:46:37 +00002524 if (exprType->isVoidType()) {
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00002525 Diag(OpLoc, diag::ext_sizeof_void_type)
2526 << (isSizeof ? "sizeof" : "__alignof") << ExprRange;
Chris Lattner01072922009-01-24 19:46:37 +00002527 return false;
2528 }
Mike Stump1eb44332009-09-09 15:08:12 +00002529
Chris Lattner1efaa952009-04-24 00:30:45 +00002530 if (RequireCompleteType(OpLoc, exprType,
Douglas Gregor5cc07df2009-12-15 16:44:32 +00002531 PDiag(diag::err_sizeof_alignof_incomplete_type)
2532 << int(!isSizeof) << ExprRange))
Chris Lattner1efaa952009-04-24 00:30:45 +00002533 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00002534
Chris Lattner1efaa952009-04-24 00:30:45 +00002535 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode.
John McCallc12c5bb2010-05-15 11:32:37 +00002536 if (LangOpts.ObjCNonFragileABI && exprType->isObjCObjectType()) {
Chris Lattner1efaa952009-04-24 00:30:45 +00002537 Diag(OpLoc, diag::err_sizeof_nonfragile_interface)
Chris Lattner5cb10d32009-04-24 22:30:50 +00002538 << exprType << isSizeof << ExprRange;
2539 return true;
Chris Lattnerca790922009-04-21 19:55:16 +00002540 }
Mike Stump1eb44332009-09-09 15:08:12 +00002541
Chris Lattner1efaa952009-04-24 00:30:45 +00002542 return false;
Reid Spencer5f016e22007-07-11 17:01:13 +00002543}
2544
John McCall2a984ca2010-10-12 00:20:44 +00002545static bool CheckAlignOfExpr(Sema &S, Expr *E, SourceLocation OpLoc,
2546 SourceRange ExprRange) {
Chris Lattner31e21e02009-01-24 20:17:12 +00002547 E = E->IgnoreParens();
Sebastian Redl28507842009-02-26 14:39:58 +00002548
Mike Stump1eb44332009-09-09 15:08:12 +00002549 // alignof decl is always ok.
Chris Lattner31e21e02009-01-24 20:17:12 +00002550 if (isa<DeclRefExpr>(E))
2551 return false;
Sebastian Redl28507842009-02-26 14:39:58 +00002552
2553 // Cannot know anything else if the expression is dependent.
2554 if (E->isTypeDependent())
2555 return false;
2556
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002557 if (E->getBitField()) {
John McCall2a984ca2010-10-12 00:20:44 +00002558 S. Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange;
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002559 return true;
Chris Lattner31e21e02009-01-24 20:17:12 +00002560 }
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002561
2562 // Alignment of a field access is always okay, so long as it isn't a
2563 // bit-field.
2564 if (MemberExpr *ME = dyn_cast<MemberExpr>(E))
Mike Stump8e1fab22009-07-22 18:58:19 +00002565 if (isa<FieldDecl>(ME->getMemberDecl()))
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002566 return false;
2567
John McCall2a984ca2010-10-12 00:20:44 +00002568 return S.CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false);
Chris Lattner31e21e02009-01-24 20:17:12 +00002569}
2570
Douglas Gregorba498172009-03-13 21:01:28 +00002571/// \brief Build a sizeof or alignof expression given a type operand.
John McCall60d7b3a2010-08-24 06:29:42 +00002572ExprResult
John McCalla93c9342009-12-07 02:54:59 +00002573Sema::CreateSizeOfAlignOfExpr(TypeSourceInfo *TInfo,
John McCall5ab75172009-11-04 07:28:41 +00002574 SourceLocation OpLoc,
Douglas Gregorba498172009-03-13 21:01:28 +00002575 bool isSizeOf, SourceRange R) {
John McCalla93c9342009-12-07 02:54:59 +00002576 if (!TInfo)
Douglas Gregorba498172009-03-13 21:01:28 +00002577 return ExprError();
2578
John McCalla93c9342009-12-07 02:54:59 +00002579 QualType T = TInfo->getType();
John McCall5ab75172009-11-04 07:28:41 +00002580
Douglas Gregorba498172009-03-13 21:01:28 +00002581 if (!T->isDependentType() &&
2582 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf))
2583 return ExprError();
2584
2585 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
John McCalla93c9342009-12-07 02:54:59 +00002586 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, TInfo,
Douglas Gregorba498172009-03-13 21:01:28 +00002587 Context.getSizeType(), OpLoc,
2588 R.getEnd()));
2589}
2590
2591/// \brief Build a sizeof or alignof expression given an expression
2592/// operand.
John McCall60d7b3a2010-08-24 06:29:42 +00002593ExprResult
Mike Stump1eb44332009-09-09 15:08:12 +00002594Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc,
Douglas Gregorba498172009-03-13 21:01:28 +00002595 bool isSizeOf, SourceRange R) {
2596 // Verify that the operand is valid.
2597 bool isInvalid = false;
2598 if (E->isTypeDependent()) {
2599 // Delay type-checking for type-dependent expressions.
2600 } else if (!isSizeOf) {
John McCall2a984ca2010-10-12 00:20:44 +00002601 isInvalid = CheckAlignOfExpr(*this, E, OpLoc, R);
Douglas Gregor33bbbc52009-05-02 02:18:30 +00002602 } else if (E->getBitField()) { // C99 6.5.3.4p1.
Douglas Gregorba498172009-03-13 21:01:28 +00002603 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0;
2604 isInvalid = true;
John McCall2cd11fe2010-10-12 02:09:17 +00002605 } else if (E->getType()->isPlaceholderType()) {
2606 ExprResult PE = CheckPlaceholderExpr(E, OpLoc);
2607 if (PE.isInvalid()) return ExprError();
2608 return CreateSizeOfAlignOfExpr(PE.take(), OpLoc, isSizeOf, R);
Douglas Gregorba498172009-03-13 21:01:28 +00002609 } else {
2610 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true);
2611 }
2612
2613 if (isInvalid)
2614 return ExprError();
2615
2616 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t.
2617 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E,
2618 Context.getSizeType(), OpLoc,
2619 R.getEnd()));
2620}
2621
Sebastian Redl05189992008-11-11 17:56:53 +00002622/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and
2623/// the same for @c alignof and @c __alignof
2624/// Note that the ArgRange is invalid if isType is false.
John McCall60d7b3a2010-08-24 06:29:42 +00002625ExprResult
Sebastian Redl05189992008-11-11 17:56:53 +00002626Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType,
2627 void *TyOrEx, const SourceRange &ArgRange) {
Reid Spencer5f016e22007-07-11 17:01:13 +00002628 // If error parsing type, ignore.
Sebastian Redl0eb23302009-01-19 00:08:26 +00002629 if (TyOrEx == 0) return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00002630
Sebastian Redl05189992008-11-11 17:56:53 +00002631 if (isType) {
John McCalla93c9342009-12-07 02:54:59 +00002632 TypeSourceInfo *TInfo;
John McCallb3d87482010-08-24 05:47:05 +00002633 (void) GetTypeFromParser(ParsedType::getFromOpaquePtr(TyOrEx), &TInfo);
John McCalla93c9342009-12-07 02:54:59 +00002634 return CreateSizeOfAlignOfExpr(TInfo, OpLoc, isSizeof, ArgRange);
Mike Stump1eb44332009-09-09 15:08:12 +00002635 }
Sebastian Redl05189992008-11-11 17:56:53 +00002636
Douglas Gregorba498172009-03-13 21:01:28 +00002637 Expr *ArgEx = (Expr *)TyOrEx;
John McCall60d7b3a2010-08-24 06:29:42 +00002638 ExprResult Result
Douglas Gregorba498172009-03-13 21:01:28 +00002639 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange());
2640
Douglas Gregorba498172009-03-13 21:01:28 +00002641 return move(Result);
Reid Spencer5f016e22007-07-11 17:01:13 +00002642}
2643
John McCall09431682010-11-18 19:01:18 +00002644static QualType CheckRealImagOperand(Sema &S, Expr *&V, SourceLocation Loc,
2645 bool isReal) {
Sebastian Redl28507842009-02-26 14:39:58 +00002646 if (V->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00002647 return S.Context.DependentTy;
Mike Stump1eb44332009-09-09 15:08:12 +00002648
Chris Lattnercc26ed72007-08-26 05:39:26 +00002649 // These operators return the element type of a complex type.
John McCall183700f2009-09-21 23:43:11 +00002650 if (const ComplexType *CT = V->getType()->getAs<ComplexType>())
Chris Lattnerdbb36972007-08-24 21:16:53 +00002651 return CT->getElementType();
Mike Stump1eb44332009-09-09 15:08:12 +00002652
Chris Lattnercc26ed72007-08-26 05:39:26 +00002653 // Otherwise they pass through real integer and floating point types here.
2654 if (V->getType()->isArithmeticType())
2655 return V->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00002656
John McCall2cd11fe2010-10-12 02:09:17 +00002657 // Test for placeholders.
John McCall09431682010-11-18 19:01:18 +00002658 ExprResult PR = S.CheckPlaceholderExpr(V, Loc);
John McCall2cd11fe2010-10-12 02:09:17 +00002659 if (PR.isInvalid()) return QualType();
2660 if (PR.take() != V) {
2661 V = PR.take();
John McCall09431682010-11-18 19:01:18 +00002662 return CheckRealImagOperand(S, V, Loc, isReal);
John McCall2cd11fe2010-10-12 02:09:17 +00002663 }
2664
Chris Lattnercc26ed72007-08-26 05:39:26 +00002665 // Reject anything else.
John McCall09431682010-11-18 19:01:18 +00002666 S.Diag(Loc, diag::err_realimag_invalid_type) << V->getType()
Chris Lattnerba27e2a2009-02-17 08:12:06 +00002667 << (isReal ? "__real" : "__imag");
Chris Lattnercc26ed72007-08-26 05:39:26 +00002668 return QualType();
Chris Lattnerdbb36972007-08-24 21:16:53 +00002669}
2670
2671
Reid Spencer5f016e22007-07-11 17:01:13 +00002672
John McCall60d7b3a2010-08-24 06:29:42 +00002673ExprResult
Sebastian Redl0eb23302009-01-19 00:08:26 +00002674Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall9ae2f072010-08-23 23:25:46 +00002675 tok::TokenKind Kind, Expr *Input) {
John McCall2de56d12010-08-25 11:45:40 +00002676 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00002677 switch (Kind) {
2678 default: assert(0 && "Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00002679 case tok::plusplus: Opc = UO_PostInc; break;
2680 case tok::minusminus: Opc = UO_PostDec; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00002681 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00002682
John McCall9ae2f072010-08-23 23:25:46 +00002683 return BuildUnaryOp(S, OpLoc, Opc, Input);
Reid Spencer5f016e22007-07-11 17:01:13 +00002684}
2685
John McCall09431682010-11-18 19:01:18 +00002686/// Expressions of certain arbitrary types are forbidden by C from
2687/// having l-value type. These are:
2688/// - 'void', but not qualified void
2689/// - function types
2690///
2691/// The exact rule here is C99 6.3.2.1:
2692/// An lvalue is an expression with an object type or an incomplete
2693/// type other than void.
2694static bool IsCForbiddenLValueType(ASTContext &C, QualType T) {
2695 return ((T->isVoidType() && !T.hasQualifiers()) ||
2696 T->isFunctionType());
2697}
2698
John McCall60d7b3a2010-08-24 06:29:42 +00002699ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00002700Sema::ActOnArraySubscriptExpr(Scope *S, Expr *Base, SourceLocation LLoc,
2701 Expr *Idx, SourceLocation RLoc) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00002702 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00002703 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
John McCall9ae2f072010-08-23 23:25:46 +00002704 if (Result.isInvalid()) return ExprError();
2705 Base = Result.take();
Nate Begeman2ef13e52009-08-10 23:49:36 +00002706
John McCall9ae2f072010-08-23 23:25:46 +00002707 Expr *LHSExp = Base, *RHSExp = Idx;
Mike Stump1eb44332009-09-09 15:08:12 +00002708
Douglas Gregor337c6b92008-11-19 17:17:41 +00002709 if (getLangOptions().CPlusPlus &&
Douglas Gregor3384c9c2009-05-19 00:01:19 +00002710 (LHSExp->isTypeDependent() || RHSExp->isTypeDependent())) {
Douglas Gregor3384c9c2009-05-19 00:01:19 +00002711 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00002712 Context.DependentTy,
2713 VK_LValue, OK_Ordinary,
2714 RLoc));
Douglas Gregor3384c9c2009-05-19 00:01:19 +00002715 }
2716
Mike Stump1eb44332009-09-09 15:08:12 +00002717 if (getLangOptions().CPlusPlus &&
Sebastian Redl0eb23302009-01-19 00:08:26 +00002718 (LHSExp->getType()->isRecordType() ||
Eli Friedman03f332a2008-12-15 22:34:21 +00002719 LHSExp->getType()->isEnumeralType() ||
2720 RHSExp->getType()->isRecordType() ||
2721 RHSExp->getType()->isEnumeralType())) {
John McCall9ae2f072010-08-23 23:25:46 +00002722 return CreateOverloadedArraySubscriptExpr(LLoc, RLoc, Base, Idx);
Douglas Gregor337c6b92008-11-19 17:17:41 +00002723 }
2724
John McCall9ae2f072010-08-23 23:25:46 +00002725 return CreateBuiltinArraySubscriptExpr(Base, LLoc, Idx, RLoc);
Sebastian Redlf322ed62009-10-29 20:17:01 +00002726}
2727
2728
John McCall60d7b3a2010-08-24 06:29:42 +00002729ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00002730Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
2731 Expr *Idx, SourceLocation RLoc) {
2732 Expr *LHSExp = Base;
2733 Expr *RHSExp = Idx;
Sebastian Redlf322ed62009-10-29 20:17:01 +00002734
Chris Lattner12d9ff62007-07-16 00:14:47 +00002735 // Perform default conversions.
Douglas Gregora873dfc2010-02-03 00:27:59 +00002736 if (!LHSExp->getType()->getAs<VectorType>())
2737 DefaultFunctionArrayLvalueConversion(LHSExp);
2738 DefaultFunctionArrayLvalueConversion(RHSExp);
Sebastian Redl0eb23302009-01-19 00:08:26 +00002739
Chris Lattner12d9ff62007-07-16 00:14:47 +00002740 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType();
John McCallf89e55a2010-11-18 06:31:45 +00002741 ExprValueKind VK = VK_LValue;
2742 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00002743
Reid Spencer5f016e22007-07-11 17:01:13 +00002744 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent
Chris Lattner73d0d4f2007-08-30 17:45:32 +00002745 // to the expression *((e1)+(e2)). This means the array "Base" may actually be
Mike Stumpeed9cac2009-02-19 03:04:26 +00002746 // in the subscript position. As a result, we need to derive the array base
Reid Spencer5f016e22007-07-11 17:01:13 +00002747 // and index from the expression types.
Chris Lattner12d9ff62007-07-16 00:14:47 +00002748 Expr *BaseExpr, *IndexExpr;
2749 QualType ResultType;
Sebastian Redl28507842009-02-26 14:39:58 +00002750 if (LHSTy->isDependentType() || RHSTy->isDependentType()) {
2751 BaseExpr = LHSExp;
2752 IndexExpr = RHSExp;
2753 ResultType = Context.DependentTy;
Ted Kremenek6217b802009-07-29 21:53:49 +00002754 } else if (const PointerType *PTy = LHSTy->getAs<PointerType>()) {
Chris Lattner12d9ff62007-07-16 00:14:47 +00002755 BaseExpr = LHSExp;
2756 IndexExpr = RHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00002757 ResultType = PTy->getPointeeType();
Ted Kremenek6217b802009-07-29 21:53:49 +00002758 } else if (const PointerType *PTy = RHSTy->getAs<PointerType>()) {
Chris Lattner7a2e0472007-07-16 00:23:25 +00002759 // Handle the uncommon case of "123[Ptr]".
Chris Lattner12d9ff62007-07-16 00:14:47 +00002760 BaseExpr = RHSExp;
2761 IndexExpr = LHSExp;
Chris Lattner12d9ff62007-07-16 00:14:47 +00002762 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00002763 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00002764 LHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00002765 BaseExpr = LHSExp;
2766 IndexExpr = RHSExp;
2767 ResultType = PTy->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00002768 } else if (const ObjCObjectPointerType *PTy =
John McCall183700f2009-09-21 23:43:11 +00002769 RHSTy->getAs<ObjCObjectPointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00002770 // Handle the uncommon case of "123[Ptr]".
2771 BaseExpr = RHSExp;
2772 IndexExpr = LHSExp;
2773 ResultType = PTy->getPointeeType();
John McCall183700f2009-09-21 23:43:11 +00002774 } else if (const VectorType *VTy = LHSTy->getAs<VectorType>()) {
Chris Lattnerc8629632007-07-31 19:29:30 +00002775 BaseExpr = LHSExp; // vectors: V[123]
Chris Lattner12d9ff62007-07-16 00:14:47 +00002776 IndexExpr = RHSExp;
John McCallf89e55a2010-11-18 06:31:45 +00002777 VK = LHSExp->getValueKind();
2778 if (VK != VK_RValue)
2779 OK = OK_VectorComponent;
Nate Begeman334a8022009-01-18 00:45:31 +00002780
Chris Lattner12d9ff62007-07-16 00:14:47 +00002781 // FIXME: need to deal with const...
2782 ResultType = VTy->getElementType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00002783 } else if (LHSTy->isArrayType()) {
2784 // If we see an array that wasn't promoted by
Douglas Gregora873dfc2010-02-03 00:27:59 +00002785 // DefaultFunctionArrayLvalueConversion, it must be an array that
Eli Friedman7c32f8e2009-04-25 23:46:54 +00002786 // wasn't promoted because of the C90 rule that doesn't
2787 // allow promoting non-lvalue arrays. Warn, then
2788 // force the promotion here.
2789 Diag(LHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
2790 LHSExp->getSourceRange();
Eli Friedman73c39ab2009-10-20 08:27:19 +00002791 ImpCastExprToType(LHSExp, Context.getArrayDecayedType(LHSTy),
John McCall2de56d12010-08-25 11:45:40 +00002792 CK_ArrayToPointerDecay);
Eli Friedman7c32f8e2009-04-25 23:46:54 +00002793 LHSTy = LHSExp->getType();
2794
2795 BaseExpr = LHSExp;
2796 IndexExpr = RHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00002797 ResultType = LHSTy->getAs<PointerType>()->getPointeeType();
Eli Friedman7c32f8e2009-04-25 23:46:54 +00002798 } else if (RHSTy->isArrayType()) {
2799 // Same as previous, except for 123[f().a] case
2800 Diag(RHSExp->getLocStart(), diag::ext_subscript_non_lvalue) <<
2801 RHSExp->getSourceRange();
Eli Friedman73c39ab2009-10-20 08:27:19 +00002802 ImpCastExprToType(RHSExp, Context.getArrayDecayedType(RHSTy),
John McCall2de56d12010-08-25 11:45:40 +00002803 CK_ArrayToPointerDecay);
Eli Friedman7c32f8e2009-04-25 23:46:54 +00002804 RHSTy = RHSExp->getType();
2805
2806 BaseExpr = RHSExp;
2807 IndexExpr = LHSExp;
Ted Kremenek6217b802009-07-29 21:53:49 +00002808 ResultType = RHSTy->getAs<PointerType>()->getPointeeType();
Reid Spencer5f016e22007-07-11 17:01:13 +00002809 } else {
Chris Lattner338395d2009-04-25 22:50:55 +00002810 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_value)
2811 << LHSExp->getSourceRange() << RHSExp->getSourceRange());
Sebastian Redl0eb23302009-01-19 00:08:26 +00002812 }
Reid Spencer5f016e22007-07-11 17:01:13 +00002813 // C99 6.5.2.1p1
Douglas Gregorf6094622010-07-23 15:58:24 +00002814 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
Chris Lattner338395d2009-04-25 22:50:55 +00002815 return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
2816 << IndexExpr->getSourceRange());
Reid Spencer5f016e22007-07-11 17:01:13 +00002817
Daniel Dunbar7e88a602009-09-17 06:31:17 +00002818 if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
Sam Weinig0f9a5b52009-09-14 20:14:57 +00002819 IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_U))
2820 && !IndexExpr->isTypeDependent())
Sam Weinig76e2b712009-09-14 01:58:58 +00002821 Diag(LLoc, diag::warn_subscript_is_char) << IndexExpr->getSourceRange();
2822
Douglas Gregore7450f52009-03-24 19:52:54 +00002823 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly,
Mike Stump1eb44332009-09-09 15:08:12 +00002824 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object
2825 // type. Note that Functions are not objects, and that (in C99 parlance)
Douglas Gregore7450f52009-03-24 19:52:54 +00002826 // incomplete types are not object types.
2827 if (ResultType->isFunctionType()) {
2828 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type)
2829 << ResultType << BaseExpr->getSourceRange();
2830 return ExprError();
2831 }
Mike Stump1eb44332009-09-09 15:08:12 +00002832
Abramo Bagnara46358452010-09-13 06:50:07 +00002833 if (ResultType->isVoidType() && !getLangOptions().CPlusPlus) {
2834 // GNU extension: subscripting on pointer to void
2835 Diag(LLoc, diag::ext_gnu_void_ptr)
2836 << BaseExpr->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00002837
2838 // C forbids expressions of unqualified void type from being l-values.
2839 // See IsCForbiddenLValueType.
2840 if (!ResultType.hasQualifiers()) VK = VK_RValue;
Abramo Bagnara46358452010-09-13 06:50:07 +00002841 } else if (!ResultType->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +00002842 RequireCompleteType(LLoc, ResultType,
Anders Carlssonb7906612009-08-26 23:45:07 +00002843 PDiag(diag::err_subscript_incomplete_type)
2844 << BaseExpr->getSourceRange()))
Douglas Gregore7450f52009-03-24 19:52:54 +00002845 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00002846
Chris Lattner1efaa952009-04-24 00:30:45 +00002847 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00002848 if (ResultType->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattner1efaa952009-04-24 00:30:45 +00002849 Diag(LLoc, diag::err_subscript_nonfragile_interface)
2850 << ResultType << BaseExpr->getSourceRange();
2851 return ExprError();
2852 }
Mike Stump1eb44332009-09-09 15:08:12 +00002853
John McCall09431682010-11-18 19:01:18 +00002854 assert(VK == VK_RValue || LangOpts.CPlusPlus ||
2855 !IsCForbiddenLValueType(Context, ResultType));
2856
Mike Stumpeed9cac2009-02-19 03:04:26 +00002857 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp,
John McCallf89e55a2010-11-18 06:31:45 +00002858 ResultType, VK, OK, RLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00002859}
2860
John McCall09431682010-11-18 19:01:18 +00002861/// Check an ext-vector component access expression.
2862///
2863/// VK should be set in advance to the value kind of the base
2864/// expression.
2865static QualType
2866CheckExtVectorComponent(Sema &S, QualType baseType, ExprValueKind &VK,
2867 SourceLocation OpLoc, const IdentifierInfo *CompName,
Anders Carlsson8f28f992009-08-26 18:25:21 +00002868 SourceLocation CompLoc) {
Daniel Dunbar2ad32892009-10-18 02:09:38 +00002869 // FIXME: Share logic with ExtVectorElementExpr::containsDuplicateElements,
2870 // see FIXME there.
2871 //
2872 // FIXME: This logic can be greatly simplified by splitting it along
2873 // halving/not halving and reworking the component checking.
John McCall183700f2009-09-21 23:43:11 +00002874 const ExtVectorType *vecType = baseType->getAs<ExtVectorType>();
Nate Begeman8a997642008-05-09 06:41:27 +00002875
Steve Naroffe1b31fe2007-07-27 22:15:19 +00002876 // The vector accessor can't exceed the number of elements.
Daniel Dunbare013d682009-10-18 20:26:12 +00002877 const char *compStr = CompName->getNameStart();
Nate Begeman353417a2009-01-18 01:47:54 +00002878
Mike Stumpeed9cac2009-02-19 03:04:26 +00002879 // This flag determines whether or not the component is one of the four
Nate Begeman353417a2009-01-18 01:47:54 +00002880 // special names that indicate a subset of exactly half the elements are
2881 // to be selected.
2882 bool HalvingSwizzle = false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00002883
Nate Begeman353417a2009-01-18 01:47:54 +00002884 // This flag determines whether or not CompName has an 's' char prefix,
2885 // indicating that it is a string of hex values to be used as vector indices.
Nate Begeman131f4652009-06-25 21:06:09 +00002886 bool HexSwizzle = *compStr == 's' || *compStr == 'S';
Nate Begeman8a997642008-05-09 06:41:27 +00002887
John McCall09431682010-11-18 19:01:18 +00002888 bool HasRepeated = false;
2889 bool HasIndex[16] = {};
2890
2891 int Idx;
2892
Nate Begeman8a997642008-05-09 06:41:27 +00002893 // Check that we've found one of the special components, or that the component
2894 // names must come from the same set.
Mike Stumpeed9cac2009-02-19 03:04:26 +00002895 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") ||
Nate Begeman353417a2009-01-18 01:47:54 +00002896 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) {
2897 HalvingSwizzle = true;
John McCall09431682010-11-18 19:01:18 +00002898 } else if (!HexSwizzle &&
2899 (Idx = vecType->getPointAccessorIdx(*compStr)) != -1) {
2900 do {
2901 if (HasIndex[Idx]) HasRepeated = true;
2902 HasIndex[Idx] = true;
Chris Lattner88dca042007-08-02 22:33:49 +00002903 compStr++;
John McCall09431682010-11-18 19:01:18 +00002904 } while (*compStr && (Idx = vecType->getPointAccessorIdx(*compStr)) != -1);
2905 } else {
2906 if (HexSwizzle) compStr++;
2907 while ((Idx = vecType->getNumericAccessorIdx(*compStr)) != -1) {
2908 if (HasIndex[Idx]) HasRepeated = true;
2909 HasIndex[Idx] = true;
Chris Lattner88dca042007-08-02 22:33:49 +00002910 compStr++;
John McCall09431682010-11-18 19:01:18 +00002911 }
Chris Lattner88dca042007-08-02 22:33:49 +00002912 }
Nate Begeman353417a2009-01-18 01:47:54 +00002913
Mike Stumpeed9cac2009-02-19 03:04:26 +00002914 if (!HalvingSwizzle && *compStr) {
Steve Naroffe1b31fe2007-07-27 22:15:19 +00002915 // We didn't get to the end of the string. This means the component names
2916 // didn't come from the same set *or* we encountered an illegal name.
John McCall09431682010-11-18 19:01:18 +00002917 S.Diag(OpLoc, diag::err_ext_vector_component_name_illegal)
Benjamin Kramer476d8b82010-08-11 14:47:12 +00002918 << llvm::StringRef(compStr, 1) << SourceRange(CompLoc);
Steve Naroffe1b31fe2007-07-27 22:15:19 +00002919 return QualType();
2920 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00002921
Nate Begeman353417a2009-01-18 01:47:54 +00002922 // Ensure no component accessor exceeds the width of the vector type it
2923 // operates on.
2924 if (!HalvingSwizzle) {
Daniel Dunbare013d682009-10-18 20:26:12 +00002925 compStr = CompName->getNameStart();
Nate Begeman353417a2009-01-18 01:47:54 +00002926
2927 if (HexSwizzle)
Steve Naroffe1b31fe2007-07-27 22:15:19 +00002928 compStr++;
Nate Begeman353417a2009-01-18 01:47:54 +00002929
2930 while (*compStr) {
2931 if (!vecType->isAccessorWithinNumElements(*compStr++)) {
John McCall09431682010-11-18 19:01:18 +00002932 S.Diag(OpLoc, diag::err_ext_vector_component_exceeds_length)
Nate Begeman353417a2009-01-18 01:47:54 +00002933 << baseType << SourceRange(CompLoc);
2934 return QualType();
2935 }
2936 }
Steve Naroffe1b31fe2007-07-27 22:15:19 +00002937 }
Nate Begeman8a997642008-05-09 06:41:27 +00002938
Steve Naroffe1b31fe2007-07-27 22:15:19 +00002939 // The component accessor looks fine - now we need to compute the actual type.
Mike Stumpeed9cac2009-02-19 03:04:26 +00002940 // The vector type is implied by the component accessor. For example,
Steve Naroffe1b31fe2007-07-27 22:15:19 +00002941 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc.
Nate Begeman353417a2009-01-18 01:47:54 +00002942 // vec4.s0 is a float, vec4.s23 is a vec3, etc.
Nate Begeman8a997642008-05-09 06:41:27 +00002943 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2.
Nate Begeman0479a0b2009-12-15 18:13:04 +00002944 unsigned CompSize = HalvingSwizzle ? (vecType->getNumElements() + 1) / 2
Anders Carlsson8f28f992009-08-26 18:25:21 +00002945 : CompName->getLength();
Nate Begeman353417a2009-01-18 01:47:54 +00002946 if (HexSwizzle)
2947 CompSize--;
2948
Steve Naroffe1b31fe2007-07-27 22:15:19 +00002949 if (CompSize == 1)
2950 return vecType->getElementType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00002951
John McCall09431682010-11-18 19:01:18 +00002952 if (HasRepeated) VK = VK_RValue;
2953
2954 QualType VT = S.Context.getExtVectorType(vecType->getElementType(), CompSize);
Mike Stumpeed9cac2009-02-19 03:04:26 +00002955 // Now look up the TypeDefDecl from the vector type. Without this,
Nate Begeman213541a2008-04-18 23:10:10 +00002956 // diagostics look bad. We want extended vector types to appear built-in.
John McCall09431682010-11-18 19:01:18 +00002957 for (unsigned i = 0, E = S.ExtVectorDecls.size(); i != E; ++i) {
2958 if (S.ExtVectorDecls[i]->getUnderlyingType() == VT)
2959 return S.Context.getTypedefType(S.ExtVectorDecls[i]);
Steve Naroffbea0b342007-07-29 16:33:31 +00002960 }
2961 return VT; // should never get here (a typedef type should always be found).
Steve Naroffe1b31fe2007-07-27 22:15:19 +00002962}
2963
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00002964static Decl *FindGetterSetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl,
Anders Carlsson8f28f992009-08-26 18:25:21 +00002965 IdentifierInfo *Member,
Douglas Gregor6ab35242009-04-09 21:40:53 +00002966 const Selector &Sel,
2967 ASTContext &Context) {
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00002968 if (Member)
2969 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Member))
2970 return PD;
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002971 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel))
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00002972 return OMD;
Mike Stump1eb44332009-09-09 15:08:12 +00002973
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00002974 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(),
2975 E = PDecl->protocol_end(); I != E; ++I) {
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00002976 if (Decl *D = FindGetterSetterNameDeclFromProtocolList(*I, Member, Sel,
2977 Context))
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00002978 return D;
2979 }
2980 return 0;
2981}
2982
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00002983static Decl *FindGetterSetterNameDecl(const ObjCObjectPointerType *QIdTy,
2984 IdentifierInfo *Member,
2985 const Selector &Sel,
2986 ASTContext &Context) {
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00002987 // Check protocols on qualified interfaces.
2988 Decl *GDecl = 0;
Steve Naroffd1b3c2d2009-06-17 22:40:22 +00002989 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(),
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00002990 E = QIdTy->qual_end(); I != E; ++I) {
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00002991 if (Member)
2992 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) {
2993 GDecl = PD;
2994 break;
2995 }
2996 // Also must look for a getter or setter name which uses property syntax.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00002997 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) {
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00002998 GDecl = OMD;
2999 break;
3000 }
3001 }
3002 if (!GDecl) {
Steve Naroffd1b3c2d2009-06-17 22:40:22 +00003003 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(),
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003004 E = QIdTy->qual_end(); I != E; ++I) {
3005 // Search in the protocol-qualifier list of current protocol.
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003006 GDecl = FindGetterSetterNameDeclFromProtocolList(*I, Member, Sel,
3007 Context);
Fariborz Jahanian2ce1be02009-03-19 18:15:34 +00003008 if (GDecl)
3009 return GDecl;
3010 }
3011 }
3012 return GDecl;
3013}
Chris Lattner76a642f2009-02-15 22:43:40 +00003014
John McCall60d7b3a2010-08-24 06:29:42 +00003015ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003016Sema::ActOnDependentMemberExpr(Expr *BaseExpr, QualType BaseType,
John McCallaa81e162009-12-01 22:10:20 +00003017 bool IsArrow, SourceLocation OpLoc,
John McCall129e2df2009-11-30 22:42:35 +00003018 const CXXScopeSpec &SS,
3019 NamedDecl *FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003020 const DeclarationNameInfo &NameInfo,
John McCall129e2df2009-11-30 22:42:35 +00003021 const TemplateArgumentListInfo *TemplateArgs) {
John McCall129e2df2009-11-30 22:42:35 +00003022 // Even in dependent contexts, try to diagnose base expressions with
3023 // obviously wrong types, e.g.:
3024 //
3025 // T* t;
3026 // t.f;
3027 //
3028 // In Obj-C++, however, the above expression is valid, since it could be
3029 // accessing the 'f' property if T is an Obj-C interface. The extra check
3030 // allows this, while still reporting an error if T is a struct pointer.
3031 if (!IsArrow) {
John McCallaa81e162009-12-01 22:10:20 +00003032 const PointerType *PT = BaseType->getAs<PointerType>();
John McCall129e2df2009-11-30 22:42:35 +00003033 if (PT && (!getLangOptions().ObjC1 ||
3034 PT->getPointeeType()->isRecordType())) {
John McCallaa81e162009-12-01 22:10:20 +00003035 assert(BaseExpr && "cannot happen with implicit member accesses");
Abramo Bagnara25777432010-08-11 22:01:17 +00003036 Diag(NameInfo.getLoc(), diag::err_typecheck_member_reference_struct_union)
John McCallaa81e162009-12-01 22:10:20 +00003037 << BaseType << BaseExpr->getSourceRange();
John McCall129e2df2009-11-30 22:42:35 +00003038 return ExprError();
3039 }
3040 }
3041
Abramo Bagnara25777432010-08-11 22:01:17 +00003042 assert(BaseType->isDependentType() ||
3043 NameInfo.getName().isDependentName() ||
Douglas Gregor01e56ae2010-04-12 20:54:26 +00003044 isDependentScopeSpecifier(SS));
John McCall129e2df2009-11-30 22:42:35 +00003045
3046 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr
3047 // must have pointer type, and the accessed type is the pointee.
John McCallaa81e162009-12-01 22:10:20 +00003048 return Owned(CXXDependentScopeMemberExpr::Create(Context, BaseExpr, BaseType,
John McCall129e2df2009-11-30 22:42:35 +00003049 IsArrow, OpLoc,
John McCall9ae2f072010-08-23 23:25:46 +00003050 SS.getScopeRep(),
John McCall129e2df2009-11-30 22:42:35 +00003051 SS.getRange(),
3052 FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003053 NameInfo, TemplateArgs));
John McCall129e2df2009-11-30 22:42:35 +00003054}
3055
3056/// We know that the given qualified member reference points only to
3057/// declarations which do not belong to the static type of the base
3058/// expression. Diagnose the problem.
3059static void DiagnoseQualifiedMemberReference(Sema &SemaRef,
3060 Expr *BaseExpr,
3061 QualType BaseType,
John McCall2f841ba2009-12-02 03:53:29 +00003062 const CXXScopeSpec &SS,
John McCall129e2df2009-11-30 22:42:35 +00003063 const LookupResult &R) {
John McCall2f841ba2009-12-02 03:53:29 +00003064 // If this is an implicit member access, use a different set of
3065 // diagnostics.
3066 if (!BaseExpr)
3067 return DiagnoseInstanceReference(SemaRef, SS, R);
John McCall129e2df2009-11-30 22:42:35 +00003068
John McCall110acc12010-04-27 01:43:38 +00003069 SemaRef.Diag(R.getNameLoc(), diag::err_qualified_member_of_unrelated)
3070 << SS.getRange() << R.getRepresentativeDecl() << BaseType;
John McCall129e2df2009-11-30 22:42:35 +00003071}
3072
3073// Check whether the declarations we found through a nested-name
3074// specifier in a member expression are actually members of the base
3075// type. The restriction here is:
3076//
3077// C++ [expr.ref]p2:
3078// ... In these cases, the id-expression shall name a
3079// member of the class or of one of its base classes.
3080//
3081// So it's perfectly legitimate for the nested-name specifier to name
3082// an unrelated class, and for us to find an overload set including
3083// decls from classes which are not superclasses, as long as the decl
3084// we actually pick through overload resolution is from a superclass.
3085bool Sema::CheckQualifiedMemberReference(Expr *BaseExpr,
3086 QualType BaseType,
John McCall2f841ba2009-12-02 03:53:29 +00003087 const CXXScopeSpec &SS,
John McCall129e2df2009-11-30 22:42:35 +00003088 const LookupResult &R) {
John McCallaa81e162009-12-01 22:10:20 +00003089 const RecordType *BaseRT = BaseType->getAs<RecordType>();
3090 if (!BaseRT) {
3091 // We can't check this yet because the base type is still
3092 // dependent.
3093 assert(BaseType->isDependentType());
3094 return false;
3095 }
3096 CXXRecordDecl *BaseRecord = cast<CXXRecordDecl>(BaseRT->getDecl());
John McCall129e2df2009-11-30 22:42:35 +00003097
3098 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
John McCallaa81e162009-12-01 22:10:20 +00003099 // If this is an implicit member reference and we find a
3100 // non-instance member, it's not an error.
John McCall161755a2010-04-06 21:38:20 +00003101 if (!BaseExpr && !(*I)->isCXXInstanceMember())
John McCallaa81e162009-12-01 22:10:20 +00003102 return false;
John McCall129e2df2009-11-30 22:42:35 +00003103
John McCallaa81e162009-12-01 22:10:20 +00003104 // Note that we use the DC of the decl, not the underlying decl.
Eli Friedman02463762010-07-27 20:51:02 +00003105 DeclContext *DC = (*I)->getDeclContext();
3106 while (DC->isTransparentContext())
3107 DC = DC->getParent();
John McCallaa81e162009-12-01 22:10:20 +00003108
Douglas Gregor9d4bb942010-07-28 22:27:52 +00003109 if (!DC->isRecord())
3110 continue;
3111
John McCallaa81e162009-12-01 22:10:20 +00003112 llvm::SmallPtrSet<CXXRecordDecl*,4> MemberRecord;
Eli Friedman02463762010-07-27 20:51:02 +00003113 MemberRecord.insert(cast<CXXRecordDecl>(DC)->getCanonicalDecl());
John McCallaa81e162009-12-01 22:10:20 +00003114
3115 if (!IsProvablyNotDerivedFrom(*this, BaseRecord, MemberRecord))
3116 return false;
3117 }
3118
John McCall2f841ba2009-12-02 03:53:29 +00003119 DiagnoseQualifiedMemberReference(*this, BaseExpr, BaseType, SS, R);
John McCallaa81e162009-12-01 22:10:20 +00003120 return true;
3121}
3122
3123static bool
3124LookupMemberExprInRecord(Sema &SemaRef, LookupResult &R,
3125 SourceRange BaseRange, const RecordType *RTy,
John McCallad00b772010-06-16 08:42:20 +00003126 SourceLocation OpLoc, CXXScopeSpec &SS,
3127 bool HasTemplateArgs) {
John McCallaa81e162009-12-01 22:10:20 +00003128 RecordDecl *RDecl = RTy->getDecl();
3129 if (SemaRef.RequireCompleteType(OpLoc, QualType(RTy, 0),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00003130 SemaRef.PDiag(diag::err_typecheck_incomplete_tag)
John McCallaa81e162009-12-01 22:10:20 +00003131 << BaseRange))
3132 return true;
3133
John McCallad00b772010-06-16 08:42:20 +00003134 if (HasTemplateArgs) {
3135 // LookupTemplateName doesn't expect these both to exist simultaneously.
3136 QualType ObjectType = SS.isSet() ? QualType() : QualType(RTy, 0);
3137
3138 bool MOUS;
3139 SemaRef.LookupTemplateName(R, 0, SS, ObjectType, false, MOUS);
3140 return false;
3141 }
3142
John McCallaa81e162009-12-01 22:10:20 +00003143 DeclContext *DC = RDecl;
3144 if (SS.isSet()) {
3145 // If the member name was a qualified-id, look into the
3146 // nested-name-specifier.
3147 DC = SemaRef.computeDeclContext(SS, false);
3148
John McCall77bb1aa2010-05-01 00:40:08 +00003149 if (SemaRef.RequireCompleteDeclContext(SS, DC)) {
John McCall2f841ba2009-12-02 03:53:29 +00003150 SemaRef.Diag(SS.getRange().getEnd(), diag::err_typecheck_incomplete_tag)
3151 << SS.getRange() << DC;
3152 return true;
3153 }
3154
John McCallaa81e162009-12-01 22:10:20 +00003155 assert(DC && "Cannot handle non-computable dependent contexts in lookup");
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003156
John McCallaa81e162009-12-01 22:10:20 +00003157 if (!isa<TypeDecl>(DC)) {
3158 SemaRef.Diag(R.getNameLoc(), diag::err_qualified_member_nonclass)
3159 << DC << SS.getRange();
3160 return true;
John McCall129e2df2009-11-30 22:42:35 +00003161 }
3162 }
3163
John McCallaa81e162009-12-01 22:10:20 +00003164 // The record definition is complete, now look up the member.
3165 SemaRef.LookupQualifiedName(R, DC);
John McCall129e2df2009-11-30 22:42:35 +00003166
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003167 if (!R.empty())
3168 return false;
3169
3170 // We didn't find anything with the given name, so try to correct
3171 // for typos.
3172 DeclarationName Name = R.getLookupName();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00003173 if (SemaRef.CorrectTypo(R, 0, &SS, DC, false, Sema::CTC_MemberLookup) &&
Douglas Gregoraaf87162010-04-14 20:04:41 +00003174 !R.empty() &&
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003175 (isa<ValueDecl>(*R.begin()) || isa<FunctionTemplateDecl>(*R.begin()))) {
3176 SemaRef.Diag(R.getNameLoc(), diag::err_no_member_suggest)
3177 << Name << DC << R.getLookupName() << SS.getRange()
Douglas Gregor849b2432010-03-31 17:46:05 +00003178 << FixItHint::CreateReplacement(R.getNameLoc(),
3179 R.getLookupName().getAsString());
Douglas Gregor67dd1d42010-01-07 00:17:44 +00003180 if (NamedDecl *ND = R.getAsSingle<NamedDecl>())
3181 SemaRef.Diag(ND->getLocation(), diag::note_previous_decl)
3182 << ND->getDeclName();
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003183 return false;
3184 } else {
3185 R.clear();
Douglas Gregor12eb5d62010-06-29 19:27:42 +00003186 R.setLookupName(Name);
Douglas Gregor2dcc0112009-12-31 07:42:17 +00003187 }
3188
John McCall129e2df2009-11-30 22:42:35 +00003189 return false;
3190}
3191
John McCall60d7b3a2010-08-24 06:29:42 +00003192ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003193Sema::BuildMemberReferenceExpr(Expr *Base, QualType BaseType,
John McCall129e2df2009-11-30 22:42:35 +00003194 SourceLocation OpLoc, bool IsArrow,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00003195 CXXScopeSpec &SS,
John McCall129e2df2009-11-30 22:42:35 +00003196 NamedDecl *FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003197 const DeclarationNameInfo &NameInfo,
John McCall129e2df2009-11-30 22:42:35 +00003198 const TemplateArgumentListInfo *TemplateArgs) {
John McCall2f841ba2009-12-02 03:53:29 +00003199 if (BaseType->isDependentType() ||
3200 (SS.isSet() && isDependentScopeSpecifier(SS)))
John McCall9ae2f072010-08-23 23:25:46 +00003201 return ActOnDependentMemberExpr(Base, BaseType,
John McCall129e2df2009-11-30 22:42:35 +00003202 IsArrow, OpLoc,
3203 SS, FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003204 NameInfo, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00003205
Abramo Bagnara25777432010-08-11 22:01:17 +00003206 LookupResult R(*this, NameInfo, LookupMemberName);
John McCall129e2df2009-11-30 22:42:35 +00003207
John McCallaa81e162009-12-01 22:10:20 +00003208 // Implicit member accesses.
3209 if (!Base) {
3210 QualType RecordTy = BaseType;
3211 if (IsArrow) RecordTy = RecordTy->getAs<PointerType>()->getPointeeType();
3212 if (LookupMemberExprInRecord(*this, R, SourceRange(),
3213 RecordTy->getAs<RecordType>(),
John McCallad00b772010-06-16 08:42:20 +00003214 OpLoc, SS, TemplateArgs != 0))
John McCallaa81e162009-12-01 22:10:20 +00003215 return ExprError();
3216
3217 // Explicit member accesses.
3218 } else {
John McCall60d7b3a2010-08-24 06:29:42 +00003219 ExprResult Result =
John McCallaa81e162009-12-01 22:10:20 +00003220 LookupMemberExpr(R, Base, IsArrow, OpLoc,
John McCalld226f652010-08-21 09:40:31 +00003221 SS, /*ObjCImpDecl*/ 0, TemplateArgs != 0);
John McCallaa81e162009-12-01 22:10:20 +00003222
3223 if (Result.isInvalid()) {
3224 Owned(Base);
3225 return ExprError();
3226 }
3227
3228 if (Result.get())
3229 return move(Result);
Sebastian Redlf3e63372010-05-07 09:25:11 +00003230
3231 // LookupMemberExpr can modify Base, and thus change BaseType
3232 BaseType = Base->getType();
John McCall129e2df2009-11-30 22:42:35 +00003233 }
3234
John McCall9ae2f072010-08-23 23:25:46 +00003235 return BuildMemberReferenceExpr(Base, BaseType,
John McCallc2233c52010-01-15 08:34:02 +00003236 OpLoc, IsArrow, SS, FirstQualifierInScope,
3237 R, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00003238}
3239
John McCall60d7b3a2010-08-24 06:29:42 +00003240ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00003241Sema::BuildMemberReferenceExpr(Expr *BaseExpr, QualType BaseExprType,
John McCallaa81e162009-12-01 22:10:20 +00003242 SourceLocation OpLoc, bool IsArrow,
3243 const CXXScopeSpec &SS,
John McCallc2233c52010-01-15 08:34:02 +00003244 NamedDecl *FirstQualifierInScope,
John McCall129e2df2009-11-30 22:42:35 +00003245 LookupResult &R,
Douglas Gregor06a9f362010-05-01 20:49:11 +00003246 const TemplateArgumentListInfo *TemplateArgs,
3247 bool SuppressQualifierCheck) {
John McCallaa81e162009-12-01 22:10:20 +00003248 QualType BaseType = BaseExprType;
John McCall129e2df2009-11-30 22:42:35 +00003249 if (IsArrow) {
3250 assert(BaseType->isPointerType());
3251 BaseType = BaseType->getAs<PointerType>()->getPointeeType();
3252 }
John McCall161755a2010-04-06 21:38:20 +00003253 R.setBaseObjectType(BaseType);
John McCall129e2df2009-11-30 22:42:35 +00003254
John McCall9ae2f072010-08-23 23:25:46 +00003255 NestedNameSpecifier *Qualifier = SS.getScopeRep();
Abramo Bagnara25777432010-08-11 22:01:17 +00003256 const DeclarationNameInfo &MemberNameInfo = R.getLookupNameInfo();
3257 DeclarationName MemberName = MemberNameInfo.getName();
3258 SourceLocation MemberLoc = MemberNameInfo.getLoc();
John McCall129e2df2009-11-30 22:42:35 +00003259
3260 if (R.isAmbiguous())
Douglas Gregorfe85ced2009-08-06 03:17:00 +00003261 return ExprError();
3262
John McCall129e2df2009-11-30 22:42:35 +00003263 if (R.empty()) {
3264 // Rederive where we looked up.
3265 DeclContext *DC = (SS.isSet()
3266 ? computeDeclContext(SS, false)
3267 : BaseType->getAs<RecordType>()->getDecl());
Nate Begeman2ef13e52009-08-10 23:49:36 +00003268
John McCall129e2df2009-11-30 22:42:35 +00003269 Diag(R.getNameLoc(), diag::err_no_member)
John McCallaa81e162009-12-01 22:10:20 +00003270 << MemberName << DC
3271 << (BaseExpr ? BaseExpr->getSourceRange() : SourceRange());
John McCall129e2df2009-11-30 22:42:35 +00003272 return ExprError();
3273 }
3274
John McCallc2233c52010-01-15 08:34:02 +00003275 // Diagnose lookups that find only declarations from a non-base
3276 // type. This is possible for either qualified lookups (which may
3277 // have been qualified with an unrelated type) or implicit member
3278 // expressions (which were found with unqualified lookup and thus
3279 // may have come from an enclosing scope). Note that it's okay for
3280 // lookup to find declarations from a non-base type as long as those
3281 // aren't the ones picked by overload resolution.
3282 if ((SS.isSet() || !BaseExpr ||
3283 (isa<CXXThisExpr>(BaseExpr) &&
3284 cast<CXXThisExpr>(BaseExpr)->isImplicit())) &&
Douglas Gregor06a9f362010-05-01 20:49:11 +00003285 !SuppressQualifierCheck &&
John McCallc2233c52010-01-15 08:34:02 +00003286 CheckQualifiedMemberReference(BaseExpr, BaseType, SS, R))
John McCall129e2df2009-11-30 22:42:35 +00003287 return ExprError();
3288
3289 // Construct an unresolved result if we in fact got an unresolved
3290 // result.
3291 if (R.isOverloadedResult() || R.isUnresolvableResult()) {
John McCallaa81e162009-12-01 22:10:20 +00003292 bool Dependent =
John McCall410a3f32009-12-19 02:05:44 +00003293 BaseExprType->isDependentType() ||
John McCallaa81e162009-12-01 22:10:20 +00003294 R.isUnresolvableResult() ||
John McCall7bb12da2010-02-02 06:20:04 +00003295 OverloadExpr::ComputeDependence(R.begin(), R.end(), TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00003296
John McCallc373d482010-01-27 01:50:18 +00003297 // Suppress any lookup-related diagnostics; we'll do these when we
3298 // pick a member.
3299 R.suppressDiagnostics();
3300
John McCall129e2df2009-11-30 22:42:35 +00003301 UnresolvedMemberExpr *MemExpr
3302 = UnresolvedMemberExpr::Create(Context, Dependent,
3303 R.isUnresolvableResult(),
John McCallaa81e162009-12-01 22:10:20 +00003304 BaseExpr, BaseExprType,
3305 IsArrow, OpLoc,
John McCall129e2df2009-11-30 22:42:35 +00003306 Qualifier, SS.getRange(),
Abramo Bagnara25777432010-08-11 22:01:17 +00003307 MemberNameInfo,
Douglas Gregor5a84dec2010-05-23 18:57:34 +00003308 TemplateArgs, R.begin(), R.end());
John McCall129e2df2009-11-30 22:42:35 +00003309
3310 return Owned(MemExpr);
3311 }
3312
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003313 assert(R.isSingleResult());
John McCall161755a2010-04-06 21:38:20 +00003314 DeclAccessPair FoundDecl = R.begin().getPair();
John McCall129e2df2009-11-30 22:42:35 +00003315 NamedDecl *MemberDecl = R.getFoundDecl();
3316
3317 // FIXME: diagnose the presence of template arguments now.
3318
3319 // If the decl being referenced had an error, return an error for this
3320 // sub-expr without emitting another error, in order to avoid cascading
3321 // error cases.
3322 if (MemberDecl->isInvalidDecl())
3323 return ExprError();
3324
John McCallaa81e162009-12-01 22:10:20 +00003325 // Handle the implicit-member-access case.
3326 if (!BaseExpr) {
3327 // If this is not an instance member, convert to a non-member access.
John McCall161755a2010-04-06 21:38:20 +00003328 if (!MemberDecl->isCXXInstanceMember())
Abramo Bagnara25777432010-08-11 22:01:17 +00003329 return BuildDeclarationNameExpr(SS, R.getLookupNameInfo(), MemberDecl);
John McCallaa81e162009-12-01 22:10:20 +00003330
Douglas Gregor828a1972010-01-07 23:12:05 +00003331 SourceLocation Loc = R.getNameLoc();
3332 if (SS.getRange().isValid())
3333 Loc = SS.getRange().getBegin();
3334 BaseExpr = new (Context) CXXThisExpr(Loc, BaseExprType,/*isImplicit=*/true);
John McCallaa81e162009-12-01 22:10:20 +00003335 }
3336
John McCall129e2df2009-11-30 22:42:35 +00003337 bool ShouldCheckUse = true;
3338 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MemberDecl)) {
3339 // Don't diagnose the use of a virtual member function unless it's
3340 // explicitly qualified.
3341 if (MD->isVirtual() && !SS.isSet())
3342 ShouldCheckUse = false;
3343 }
3344
3345 // Check the use of this member.
3346 if (ShouldCheckUse && DiagnoseUseOfDecl(MemberDecl, MemberLoc)) {
3347 Owned(BaseExpr);
3348 return ExprError();
3349 }
3350
John McCalldfa1edb2010-11-23 20:48:44 +00003351 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl))
3352 return BuildFieldReferenceExpr(*this, BaseExpr, IsArrow,
3353 SS, FD, FoundDecl, MemberNameInfo);
John McCall129e2df2009-11-30 22:42:35 +00003354
Francois Pichet87c2e122010-11-21 06:08:52 +00003355 if (IndirectFieldDecl *FD = dyn_cast<IndirectFieldDecl>(MemberDecl))
3356 // We may have found a field within an anonymous union or struct
3357 // (C++ [class.union]).
3358 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD,
3359 BaseExpr, OpLoc);
3360
John McCall129e2df2009-11-30 22:42:35 +00003361 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) {
3362 MarkDeclarationReferenced(MemberLoc, Var);
3363 return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00003364 Var, FoundDecl, MemberNameInfo,
John McCallf89e55a2010-11-18 06:31:45 +00003365 Var->getType().getNonReferenceType(),
John McCall09431682010-11-18 19:01:18 +00003366 VK_LValue, OK_Ordinary));
John McCall129e2df2009-11-30 22:42:35 +00003367 }
3368
John McCallf89e55a2010-11-18 06:31:45 +00003369 if (CXXMethodDecl *MemberFn = dyn_cast<CXXMethodDecl>(MemberDecl)) {
John McCall129e2df2009-11-30 22:42:35 +00003370 MarkDeclarationReferenced(MemberLoc, MemberDecl);
3371 return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00003372 MemberFn, FoundDecl, MemberNameInfo,
John McCallf89e55a2010-11-18 06:31:45 +00003373 MemberFn->getType(),
3374 MemberFn->isInstance() ? VK_RValue : VK_LValue,
3375 OK_Ordinary));
John McCall129e2df2009-11-30 22:42:35 +00003376 }
John McCallf89e55a2010-11-18 06:31:45 +00003377 assert(!isa<FunctionDecl>(MemberDecl) && "member function not C++ method?");
John McCall129e2df2009-11-30 22:42:35 +00003378
3379 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) {
3380 MarkDeclarationReferenced(MemberLoc, MemberDecl);
3381 return Owned(BuildMemberExpr(Context, BaseExpr, IsArrow, SS,
Abramo Bagnara25777432010-08-11 22:01:17 +00003382 Enum, FoundDecl, MemberNameInfo,
John McCallf89e55a2010-11-18 06:31:45 +00003383 Enum->getType(), VK_RValue, OK_Ordinary));
John McCall129e2df2009-11-30 22:42:35 +00003384 }
3385
3386 Owned(BaseExpr);
3387
Douglas Gregorb0fd4832010-04-25 20:55:08 +00003388 // We found something that we didn't expect. Complain.
John McCall129e2df2009-11-30 22:42:35 +00003389 if (isa<TypeDecl>(MemberDecl))
Abramo Bagnara25777432010-08-11 22:01:17 +00003390 Diag(MemberLoc, diag::err_typecheck_member_reference_type)
Douglas Gregorb0fd4832010-04-25 20:55:08 +00003391 << MemberName << BaseType << int(IsArrow);
3392 else
3393 Diag(MemberLoc, diag::err_typecheck_member_reference_unknown)
3394 << MemberName << BaseType << int(IsArrow);
John McCall129e2df2009-11-30 22:42:35 +00003395
Douglas Gregorb0fd4832010-04-25 20:55:08 +00003396 Diag(MemberDecl->getLocation(), diag::note_member_declared_here)
3397 << MemberName;
Douglas Gregor2b147f02010-04-25 21:15:30 +00003398 R.suppressDiagnostics();
Douglas Gregorb0fd4832010-04-25 20:55:08 +00003399 return ExprError();
John McCall129e2df2009-11-30 22:42:35 +00003400}
3401
3402/// Look up the given member of the given non-type-dependent
3403/// expression. This can return in one of two ways:
3404/// * If it returns a sentinel null-but-valid result, the caller will
3405/// assume that lookup was performed and the results written into
3406/// the provided structure. It will take over from there.
3407/// * Otherwise, the returned expression will be produced in place of
3408/// an ordinary member expression.
3409///
3410/// The ObjCImpDecl bit is a gross hack that will need to be properly
3411/// fixed for ObjC++.
John McCall60d7b3a2010-08-24 06:29:42 +00003412ExprResult
John McCall129e2df2009-11-30 22:42:35 +00003413Sema::LookupMemberExpr(LookupResult &R, Expr *&BaseExpr,
John McCall812c1542009-12-07 22:46:59 +00003414 bool &IsArrow, SourceLocation OpLoc,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00003415 CXXScopeSpec &SS,
John McCalld226f652010-08-21 09:40:31 +00003416 Decl *ObjCImpDecl, bool HasTemplateArgs) {
Douglas Gregora71d8192009-09-04 17:36:40 +00003417 assert(BaseExpr && "no base expression");
Mike Stump1eb44332009-09-09 15:08:12 +00003418
Steve Naroff3cc4af82007-12-16 21:42:28 +00003419 // Perform default conversions.
3420 DefaultFunctionArrayConversion(BaseExpr);
Sebastian Redl0eb23302009-01-19 00:08:26 +00003421
Steve Naroffdfa6aae2007-07-26 03:11:44 +00003422 QualType BaseType = BaseExpr->getType();
John McCall129e2df2009-11-30 22:42:35 +00003423 assert(!BaseType->isDependentType());
3424
3425 DeclarationName MemberName = R.getLookupName();
3426 SourceLocation MemberLoc = R.getNameLoc();
Douglas Gregor3f0b5fd2009-11-06 06:30:47 +00003427
3428 // If the user is trying to apply -> or . to a function pointer
John McCall129e2df2009-11-30 22:42:35 +00003429 // type, it's probably because they forgot parentheses to call that
Douglas Gregor3f0b5fd2009-11-06 06:30:47 +00003430 // function. Suggest the addition of those parentheses, build the
3431 // call, and continue on.
3432 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) {
3433 if (const FunctionProtoType *Fun
3434 = Ptr->getPointeeType()->getAs<FunctionProtoType>()) {
3435 QualType ResultTy = Fun->getResultType();
3436 if (Fun->getNumArgs() == 0 &&
John McCall129e2df2009-11-30 22:42:35 +00003437 ((!IsArrow && ResultTy->isRecordType()) ||
3438 (IsArrow && ResultTy->isPointerType() &&
Douglas Gregor3f0b5fd2009-11-06 06:30:47 +00003439 ResultTy->getAs<PointerType>()->getPointeeType()
3440 ->isRecordType()))) {
3441 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd());
Nick Lewycky3d6c45d2010-10-15 21:43:24 +00003442 Diag(BaseExpr->getExprLoc(), diag::err_member_reference_needs_call)
Douglas Gregor3f0b5fd2009-11-06 06:30:47 +00003443 << QualType(Fun, 0)
Douglas Gregor849b2432010-03-31 17:46:05 +00003444 << FixItHint::CreateInsertion(Loc, "()");
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003445
John McCall60d7b3a2010-08-24 06:29:42 +00003446 ExprResult NewBase
Douglas Gregora1a04782010-09-09 16:33:13 +00003447 = ActOnCallExpr(0, BaseExpr, Loc, MultiExprArg(*this, 0, 0), Loc);
Douglas Gregorf918b832010-06-21 22:46:46 +00003448 BaseExpr = 0;
Douglas Gregor3f0b5fd2009-11-06 06:30:47 +00003449 if (NewBase.isInvalid())
John McCall129e2df2009-11-30 22:42:35 +00003450 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003451
Douglas Gregor3f0b5fd2009-11-06 06:30:47 +00003452 BaseExpr = NewBase.takeAs<Expr>();
3453 DefaultFunctionArrayConversion(BaseExpr);
3454 BaseType = BaseExpr->getType();
3455 }
3456 }
3457 }
3458
David Chisnall0f436562009-08-17 16:35:33 +00003459 // If this is an Objective-C pseudo-builtin and a definition is provided then
3460 // use that.
3461 if (BaseType->isObjCIdType()) {
Fariborz Jahanian6d910f02009-12-07 20:09:25 +00003462 if (IsArrow) {
3463 // Handle the following exceptional case PObj->isa.
3464 if (const ObjCObjectPointerType *OPT =
3465 BaseType->getAs<ObjCObjectPointerType>()) {
John McCallc12c5bb2010-05-15 11:32:37 +00003466 if (OPT->getObjectType()->isObjCId() &&
Fariborz Jahanian6d910f02009-12-07 20:09:25 +00003467 MemberName.getAsIdentifierInfo()->isStr("isa"))
Fariborz Jahanian83dc3252009-12-09 19:05:56 +00003468 return Owned(new (Context) ObjCIsaExpr(BaseExpr, true, MemberLoc,
3469 Context.getObjCClassType()));
Fariborz Jahanian6d910f02009-12-07 20:09:25 +00003470 }
3471 }
David Chisnall0f436562009-08-17 16:35:33 +00003472 // We have an 'id' type. Rather than fall through, we check if this
3473 // is a reference to 'isa'.
3474 if (BaseType != Context.ObjCIdRedefinitionType) {
3475 BaseType = Context.ObjCIdRedefinitionType;
John McCall2de56d12010-08-25 11:45:40 +00003476 ImpCastExprToType(BaseExpr, BaseType, CK_BitCast);
David Chisnall0f436562009-08-17 16:35:33 +00003477 }
David Chisnall0f436562009-08-17 16:35:33 +00003478 }
John McCall129e2df2009-11-30 22:42:35 +00003479
Fariborz Jahanian369a3bd2009-11-25 23:07:42 +00003480 // If this is an Objective-C pseudo-builtin and a definition is provided then
3481 // use that.
3482 if (Context.isObjCSelType(BaseType)) {
3483 // We have an 'SEL' type. Rather than fall through, we check if this
3484 // is a reference to 'sel_id'.
3485 if (BaseType != Context.ObjCSelRedefinitionType) {
3486 BaseType = Context.ObjCSelRedefinitionType;
John McCall2de56d12010-08-25 11:45:40 +00003487 ImpCastExprToType(BaseExpr, BaseType, CK_BitCast);
Fariborz Jahanian369a3bd2009-11-25 23:07:42 +00003488 }
3489 }
John McCall129e2df2009-11-30 22:42:35 +00003490
Steve Naroffdfa6aae2007-07-26 03:11:44 +00003491 assert(!BaseType.isNull() && "no type for member expression");
Sebastian Redl0eb23302009-01-19 00:08:26 +00003492
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00003493 // Handle properties on ObjC 'Class' types.
John McCall129e2df2009-11-30 22:42:35 +00003494 if (!IsArrow && BaseType->isObjCClassType()) {
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00003495 // Also must look for a getter name which uses property syntax.
3496 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
3497 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
3498 if (ObjCMethodDecl *MD = getCurMethodDecl()) {
3499 ObjCInterfaceDecl *IFace = MD->getClassInterface();
3500 ObjCMethodDecl *Getter;
3501 // FIXME: need to also look locally in the implementation.
3502 if ((Getter = IFace->lookupClassMethod(Sel))) {
3503 // Check the use of this method.
3504 if (DiagnoseUseOfDecl(Getter, MemberLoc))
3505 return ExprError();
3506 }
3507 // If we found a getter then this may be a valid dot-reference, we
3508 // will look for the matching setter, in case it is needed.
3509 Selector SetterSel =
3510 SelectorTable::constructSetterName(PP.getIdentifierTable(),
3511 PP.getSelectorTable(), Member);
3512 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
3513 if (!Setter) {
3514 // If this reference is in an @implementation, also check for 'private'
3515 // methods.
Steve Naroffd789d3d2009-10-01 23:46:04 +00003516 Setter = IFace->lookupPrivateInstanceMethod(SetterSel);
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00003517 }
3518 // Look through local category implementations associated with the class.
3519 if (!Setter)
3520 Setter = IFace->getCategoryClassMethod(SetterSel);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003521
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00003522 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
3523 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003524
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00003525 if (Getter || Setter) {
3526 QualType PType;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003527
John McCall09431682010-11-18 19:01:18 +00003528 ExprValueKind VK = VK_LValue;
3529 if (Getter) {
Douglas Gregor5291c3c2010-07-13 08:18:22 +00003530 PType = Getter->getSendResultType();
John McCall09431682010-11-18 19:01:18 +00003531 if (!getLangOptions().CPlusPlus &&
3532 IsCForbiddenLValueType(Context, PType))
3533 VK = VK_RValue;
3534 } else {
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00003535 // Get the expression type from Setter's incoming parameter.
3536 PType = (*(Setter->param_end() -1))->getType();
John McCall09431682010-11-18 19:01:18 +00003537 }
3538 ExprObjectKind OK = (VK == VK_RValue ? OK_Ordinary : OK_ObjCProperty);
3539
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00003540 // FIXME: we must check that the setter has property type.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003541 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(Getter,
John McCall09431682010-11-18 19:01:18 +00003542 PType, VK, OK,
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00003543 Setter, MemberLoc, BaseExpr));
3544 }
3545 return ExprError(Diag(MemberLoc, diag::err_property_not_found)
3546 << MemberName << BaseType);
3547 }
3548 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003549
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00003550 if (BaseType->isObjCClassType() &&
3551 BaseType != Context.ObjCClassRedefinitionType) {
3552 BaseType = Context.ObjCClassRedefinitionType;
John McCall2de56d12010-08-25 11:45:40 +00003553 ImpCastExprToType(BaseExpr, BaseType, CK_BitCast);
Fariborz Jahanianb2ef1be2009-09-22 16:48:37 +00003554 }
Mike Stump1eb44332009-09-09 15:08:12 +00003555
John McCall129e2df2009-11-30 22:42:35 +00003556 if (IsArrow) {
3557 if (const PointerType *PT = BaseType->getAs<PointerType>())
Steve Naroffdfa6aae2007-07-26 03:11:44 +00003558 BaseType = PT->getPointeeType();
Steve Naroff14108da2009-07-10 23:34:53 +00003559 else if (BaseType->isObjCObjectPointerType())
3560 ;
John McCall812c1542009-12-07 22:46:59 +00003561 else if (BaseType->isRecordType()) {
3562 // Recover from arrow accesses to records, e.g.:
3563 // struct MyRecord foo;
3564 // foo->bar
3565 // This is actually well-formed in C++ if MyRecord has an
3566 // overloaded operator->, but that should have been dealt with
3567 // by now.
3568 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
3569 << BaseType << int(IsArrow) << BaseExpr->getSourceRange()
Douglas Gregor849b2432010-03-31 17:46:05 +00003570 << FixItHint::CreateReplacement(OpLoc, ".");
John McCall812c1542009-12-07 22:46:59 +00003571 IsArrow = false;
3572 } else {
John McCall129e2df2009-11-30 22:42:35 +00003573 Diag(MemberLoc, diag::err_typecheck_member_reference_arrow)
3574 << BaseType << BaseExpr->getSourceRange();
3575 return ExprError();
Anders Carlsson4ef27702009-05-16 20:31:20 +00003576 }
John McCall812c1542009-12-07 22:46:59 +00003577 } else {
3578 // Recover from dot accesses to pointers, e.g.:
3579 // type *foo;
3580 // foo.bar
3581 // This is actually well-formed in two cases:
3582 // - 'type' is an Objective C type
3583 // - 'bar' is a pseudo-destructor name which happens to refer to
3584 // the appropriate pointer type
3585 if (MemberName.getNameKind() != DeclarationName::CXXDestructorName) {
3586 const PointerType *PT = BaseType->getAs<PointerType>();
3587 if (PT && PT->getPointeeType()->isRecordType()) {
3588 Diag(OpLoc, diag::err_typecheck_member_reference_suggestion)
3589 << BaseType << int(IsArrow) << BaseExpr->getSourceRange()
Douglas Gregor849b2432010-03-31 17:46:05 +00003590 << FixItHint::CreateReplacement(OpLoc, "->");
John McCall812c1542009-12-07 22:46:59 +00003591 BaseType = PT->getPointeeType();
3592 IsArrow = true;
3593 }
3594 }
John McCall129e2df2009-11-30 22:42:35 +00003595 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003596
John McCallc12c5bb2010-05-15 11:32:37 +00003597 // Handle field access to simple records.
Ted Kremenek6217b802009-07-29 21:53:49 +00003598 if (const RecordType *RTy = BaseType->getAs<RecordType>()) {
John McCallaa81e162009-12-01 22:10:20 +00003599 if (LookupMemberExprInRecord(*this, R, BaseExpr->getSourceRange(),
John McCallad00b772010-06-16 08:42:20 +00003600 RTy, OpLoc, SS, HasTemplateArgs))
Douglas Gregor4ec339f2009-01-19 19:26:10 +00003601 return ExprError();
John McCall129e2df2009-11-30 22:42:35 +00003602 return Owned((Expr*) 0);
Chris Lattnerfb173ec2008-07-21 04:28:12 +00003603 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003604
Chris Lattnera38e6b12008-07-21 04:59:05 +00003605 // Handle access to Objective-C instance variables, such as "Obj->ivar" and
3606 // (*Obj).ivar.
John McCall129e2df2009-11-30 22:42:35 +00003607 if ((IsArrow && BaseType->isObjCObjectPointerType()) ||
John McCallc12c5bb2010-05-15 11:32:37 +00003608 (!IsArrow && BaseType->isObjCObjectType())) {
John McCall183700f2009-09-21 23:43:11 +00003609 const ObjCObjectPointerType *OPT = BaseType->getAs<ObjCObjectPointerType>();
John McCallc12c5bb2010-05-15 11:32:37 +00003610 ObjCInterfaceDecl *IDecl =
3611 OPT ? OPT->getInterfaceDecl()
3612 : BaseType->getAs<ObjCObjectType>()->getInterface();
3613 if (IDecl) {
Anders Carlsson8f28f992009-08-26 18:25:21 +00003614 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
3615
Steve Naroffc70e8d92009-07-16 00:25:06 +00003616 ObjCInterfaceDecl *ClassDeclared;
Anders Carlsson8f28f992009-08-26 18:25:21 +00003617 ObjCIvarDecl *IV = IDecl->lookupInstanceVariable(Member, ClassDeclared);
Mike Stump1eb44332009-09-09 15:08:12 +00003618
Douglas Gregorf06cdae2010-01-03 18:01:57 +00003619 if (!IV) {
3620 // Attempt to correct for typos in ivar names.
3621 LookupResult Res(*this, R.getLookupName(), R.getNameLoc(),
3622 LookupMemberName);
Douglas Gregor9a632ea2010-10-20 03:06:34 +00003623 if (CorrectTypo(Res, 0, 0, IDecl, false,
3624 IsArrow? CTC_ObjCIvarLookup
3625 : CTC_ObjCPropertyLookup) &&
Douglas Gregorf06cdae2010-01-03 18:01:57 +00003626 (IV = Res.getAsSingle<ObjCIvarDecl>())) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003627 Diag(R.getNameLoc(),
Douglas Gregorf06cdae2010-01-03 18:01:57 +00003628 diag::err_typecheck_member_reference_ivar_suggest)
3629 << IDecl->getDeclName() << MemberName << IV->getDeclName()
Douglas Gregor849b2432010-03-31 17:46:05 +00003630 << FixItHint::CreateReplacement(R.getNameLoc(),
3631 IV->getNameAsString());
Douglas Gregor67dd1d42010-01-07 00:17:44 +00003632 Diag(IV->getLocation(), diag::note_previous_decl)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003633 << IV->getDeclName();
Douglas Gregor12eb5d62010-06-29 19:27:42 +00003634 } else {
3635 Res.clear();
3636 Res.setLookupName(Member);
Douglas Gregorf06cdae2010-01-03 18:01:57 +00003637 }
3638 }
3639
Steve Naroffc70e8d92009-07-16 00:25:06 +00003640 if (IV) {
3641 // If the decl being referenced had an error, return an error for this
3642 // sub-expr without emitting another error, in order to avoid cascading
3643 // error cases.
3644 if (IV->isInvalidDecl())
3645 return ExprError();
Douglas Gregor48f3bb92009-02-18 21:56:37 +00003646
Steve Naroffc70e8d92009-07-16 00:25:06 +00003647 // Check whether we can reference this field.
3648 if (DiagnoseUseOfDecl(IV, MemberLoc))
3649 return ExprError();
3650 if (IV->getAccessControl() != ObjCIvarDecl::Public &&
3651 IV->getAccessControl() != ObjCIvarDecl::Package) {
3652 ObjCInterfaceDecl *ClassOfMethodDecl = 0;
3653 if (ObjCMethodDecl *MD = getCurMethodDecl())
3654 ClassOfMethodDecl = MD->getClassInterface();
3655 else if (ObjCImpDecl && getCurFunctionDecl()) {
3656 // Case of a c-function declared inside an objc implementation.
3657 // FIXME: For a c-style function nested inside an objc implementation
3658 // class, there is no implementation context available, so we pass
3659 // down the context as argument to this routine. Ideally, this context
3660 // need be passed down in the AST node and somehow calculated from the
3661 // AST for a function decl.
Mike Stump1eb44332009-09-09 15:08:12 +00003662 if (ObjCImplementationDecl *IMPD =
John McCalld226f652010-08-21 09:40:31 +00003663 dyn_cast<ObjCImplementationDecl>(ObjCImpDecl))
Steve Naroffc70e8d92009-07-16 00:25:06 +00003664 ClassOfMethodDecl = IMPD->getClassInterface();
3665 else if (ObjCCategoryImplDecl* CatImplClass =
John McCalld226f652010-08-21 09:40:31 +00003666 dyn_cast<ObjCCategoryImplDecl>(ObjCImpDecl))
Steve Naroffc70e8d92009-07-16 00:25:06 +00003667 ClassOfMethodDecl = CatImplClass->getClassInterface();
3668 }
Mike Stump1eb44332009-09-09 15:08:12 +00003669
3670 if (IV->getAccessControl() == ObjCIvarDecl::Private) {
3671 if (ClassDeclared != IDecl ||
Steve Naroffc70e8d92009-07-16 00:25:06 +00003672 ClassOfMethodDecl != ClassDeclared)
Mike Stump1eb44332009-09-09 15:08:12 +00003673 Diag(MemberLoc, diag::error_private_ivar_access)
Steve Naroffc70e8d92009-07-16 00:25:06 +00003674 << IV->getDeclName();
Mike Stumpac5fc7c2009-08-04 21:02:39 +00003675 } else if (!IDecl->isSuperClassOf(ClassOfMethodDecl))
3676 // @protected
Mike Stump1eb44332009-09-09 15:08:12 +00003677 Diag(MemberLoc, diag::error_protected_ivar_access)
Steve Naroffc70e8d92009-07-16 00:25:06 +00003678 << IV->getDeclName();
Steve Naroffb06d8752009-03-04 18:34:24 +00003679 }
Steve Naroffc70e8d92009-07-16 00:25:06 +00003680
3681 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(),
3682 MemberLoc, BaseExpr,
John McCall129e2df2009-11-30 22:42:35 +00003683 IsArrow));
Fariborz Jahanian935fd762009-03-03 01:21:12 +00003684 }
Steve Naroffc70e8d92009-07-16 00:25:06 +00003685 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar)
Anders Carlsson8f28f992009-08-26 18:25:21 +00003686 << IDecl->getDeclName() << MemberName
Steve Naroffc70e8d92009-07-16 00:25:06 +00003687 << BaseExpr->getSourceRange());
Fariborz Jahanianaaa63a72008-12-13 22:20:28 +00003688 }
Chris Lattnerfb173ec2008-07-21 04:28:12 +00003689 }
Steve Naroffde2e22d2009-07-15 18:40:39 +00003690 // Handle properties on 'id' and qualified "id".
John McCall129e2df2009-11-30 22:42:35 +00003691 if (!IsArrow && (BaseType->isObjCIdType() ||
3692 BaseType->isObjCQualifiedIdType())) {
John McCall183700f2009-09-21 23:43:11 +00003693 const ObjCObjectPointerType *QIdTy = BaseType->getAs<ObjCObjectPointerType>();
Anders Carlsson8f28f992009-08-26 18:25:21 +00003694 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
Mike Stump1eb44332009-09-09 15:08:12 +00003695
Steve Naroff14108da2009-07-10 23:34:53 +00003696 // Check protocols on qualified interfaces.
Anders Carlsson8f28f992009-08-26 18:25:21 +00003697 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003698 if (Decl *PMDecl = FindGetterSetterNameDecl(QIdTy, Member, Sel,
3699 Context)) {
Steve Naroff14108da2009-07-10 23:34:53 +00003700 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) {
3701 // Check the use of this declaration
3702 if (DiagnoseUseOfDecl(PD, MemberLoc))
3703 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003704
Steve Naroff14108da2009-07-10 23:34:53 +00003705 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(),
John McCallf89e55a2010-11-18 06:31:45 +00003706 VK_LValue, OK_ObjCProperty,
Fariborz Jahanian8ac2d442010-10-14 16:04:05 +00003707 MemberLoc,
3708 BaseExpr));
Steve Naroff14108da2009-07-10 23:34:53 +00003709 }
3710 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) {
3711 // Check the use of this method.
3712 if (DiagnoseUseOfDecl(OMD, MemberLoc))
3713 return ExprError();
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003714 Selector SetterSel =
3715 SelectorTable::constructSetterName(PP.getIdentifierTable(),
3716 PP.getSelectorTable(), Member);
3717 ObjCMethodDecl *SMD = 0;
3718 if (Decl *SDecl = FindGetterSetterNameDecl(QIdTy, /*Property id*/0,
3719 SetterSel, Context))
3720 SMD = dyn_cast<ObjCMethodDecl>(SDecl);
3721 QualType PType = OMD->getSendResultType();
John McCall09431682010-11-18 19:01:18 +00003722
3723 ExprValueKind VK = VK_LValue;
3724 if (!getLangOptions().CPlusPlus &&
3725 IsCForbiddenLValueType(Context, PType))
3726 VK = VK_RValue;
3727 ExprObjectKind OK = (VK == VK_RValue ? OK_Ordinary : OK_ObjCProperty);
3728
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003729 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr(OMD, PType,
John McCall09431682010-11-18 19:01:18 +00003730 VK, OK, SMD,
Fariborz Jahanianf2ad2c92010-10-11 21:29:12 +00003731 MemberLoc,
3732 BaseExpr));
Steve Naroff14108da2009-07-10 23:34:53 +00003733 }
3734 }
Sebastian Redl0eb23302009-01-19 00:08:26 +00003735
Steve Naroff14108da2009-07-10 23:34:53 +00003736 return ExprError(Diag(MemberLoc, diag::err_property_not_found)
Anders Carlsson8f28f992009-08-26 18:25:21 +00003737 << MemberName << BaseType);
Steve Naroff14108da2009-07-10 23:34:53 +00003738 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00003739
Chris Lattnera38e6b12008-07-21 04:59:05 +00003740 // Handle Objective-C property access, which is "Obj.property" where Obj is a
3741 // pointer to a (potentially qualified) interface type.
Chris Lattner7f816522010-04-11 07:45:24 +00003742 if (!IsArrow)
3743 if (const ObjCObjectPointerType *OPT =
3744 BaseType->getAsObjCInterfacePointerType())
Fariborz Jahanian8ac2d442010-10-14 16:04:05 +00003745 return HandleExprPropertyRefExpr(OPT, BaseExpr, MemberName, MemberLoc,
3746 SourceLocation(), QualType(), false);
Mike Stump1eb44332009-09-09 15:08:12 +00003747
Steve Narofff242b1b2009-07-24 17:54:45 +00003748 // Handle the following exceptional case (*Obj).isa.
John McCall129e2df2009-11-30 22:42:35 +00003749 if (!IsArrow &&
John McCallc12c5bb2010-05-15 11:32:37 +00003750 BaseType->isObjCObjectType() &&
3751 BaseType->getAs<ObjCObjectType>()->isObjCId() &&
Anders Carlsson8f28f992009-08-26 18:25:21 +00003752 MemberName.getAsIdentifierInfo()->isStr("isa"))
Steve Narofff242b1b2009-07-24 17:54:45 +00003753 return Owned(new (Context) ObjCIsaExpr(BaseExpr, false, MemberLoc,
Fariborz Jahanian83dc3252009-12-09 19:05:56 +00003754 Context.getObjCClassType()));
Steve Narofff242b1b2009-07-24 17:54:45 +00003755
Chris Lattnerfb173ec2008-07-21 04:28:12 +00003756 // Handle 'field access' to vectors, such as 'V.xx'.
Chris Lattner73525de2009-02-16 21:11:58 +00003757 if (BaseType->isExtVectorType()) {
Anders Carlsson8f28f992009-08-26 18:25:21 +00003758 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
John McCall09431682010-11-18 19:01:18 +00003759 ExprValueKind VK = BaseExpr->getValueKind();
3760 QualType ret = CheckExtVectorComponent(*this, BaseType, VK, OpLoc,
3761 Member, MemberLoc);
Chris Lattnerfb173ec2008-07-21 04:28:12 +00003762 if (ret.isNull())
Sebastian Redl0eb23302009-01-19 00:08:26 +00003763 return ExprError();
John McCall09431682010-11-18 19:01:18 +00003764
3765 return Owned(new (Context) ExtVectorElementExpr(ret, VK, BaseExpr,
3766 *Member, MemberLoc));
Chris Lattnerfb173ec2008-07-21 04:28:12 +00003767 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003768
Douglas Gregor214f31a2009-03-27 06:00:30 +00003769 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union)
3770 << BaseType << BaseExpr->getSourceRange();
3771
Douglas Gregor214f31a2009-03-27 06:00:30 +00003772 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +00003773}
3774
John McCall129e2df2009-11-30 22:42:35 +00003775/// The main callback when the parser finds something like
3776/// expression . [nested-name-specifier] identifier
3777/// expression -> [nested-name-specifier] identifier
3778/// where 'identifier' encompasses a fairly broad spectrum of
3779/// possibilities, including destructor and operator references.
3780///
3781/// \param OpKind either tok::arrow or tok::period
3782/// \param HasTrailingLParen whether the next token is '(', which
3783/// is used to diagnose mis-uses of special members that can
3784/// only be called
3785/// \param ObjCImpDecl the current ObjC @implementation decl;
3786/// this is an ugly hack around the fact that ObjC @implementations
3787/// aren't properly put in the context chain
John McCall60d7b3a2010-08-24 06:29:42 +00003788ExprResult Sema::ActOnMemberAccessExpr(Scope *S, Expr *Base,
John McCall129e2df2009-11-30 22:42:35 +00003789 SourceLocation OpLoc,
3790 tok::TokenKind OpKind,
Jeffrey Yasskin9ab14542010-04-08 16:38:48 +00003791 CXXScopeSpec &SS,
John McCall129e2df2009-11-30 22:42:35 +00003792 UnqualifiedId &Id,
John McCalld226f652010-08-21 09:40:31 +00003793 Decl *ObjCImpDecl,
John McCall129e2df2009-11-30 22:42:35 +00003794 bool HasTrailingLParen) {
3795 if (SS.isSet() && SS.isInvalid())
3796 return ExprError();
3797
3798 TemplateArgumentListInfo TemplateArgsBuffer;
3799
3800 // Decompose the name into its component parts.
Abramo Bagnara25777432010-08-11 22:01:17 +00003801 DeclarationNameInfo NameInfo;
John McCall129e2df2009-11-30 22:42:35 +00003802 const TemplateArgumentListInfo *TemplateArgs;
3803 DecomposeUnqualifiedId(*this, Id, TemplateArgsBuffer,
Abramo Bagnara25777432010-08-11 22:01:17 +00003804 NameInfo, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00003805
Abramo Bagnara25777432010-08-11 22:01:17 +00003806 DeclarationName Name = NameInfo.getName();
John McCall129e2df2009-11-30 22:42:35 +00003807 bool IsArrow = (OpKind == tok::arrow);
3808
3809 NamedDecl *FirstQualifierInScope
3810 = (!SS.isSet() ? 0 : FindFirstQualifierInScope(S,
3811 static_cast<NestedNameSpecifier*>(SS.getScopeRep())));
3812
3813 // This is a postfix expression, so get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00003814 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Base);
John McCall9ae2f072010-08-23 23:25:46 +00003815 if (Result.isInvalid()) return ExprError();
3816 Base = Result.take();
John McCall129e2df2009-11-30 22:42:35 +00003817
Douglas Gregor01e56ae2010-04-12 20:54:26 +00003818 if (Base->getType()->isDependentType() || Name.isDependentName() ||
3819 isDependentScopeSpecifier(SS)) {
John McCall9ae2f072010-08-23 23:25:46 +00003820 Result = ActOnDependentMemberExpr(Base, Base->getType(),
John McCall129e2df2009-11-30 22:42:35 +00003821 IsArrow, OpLoc,
3822 SS, FirstQualifierInScope,
Abramo Bagnara25777432010-08-11 22:01:17 +00003823 NameInfo, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00003824 } else {
Abramo Bagnara25777432010-08-11 22:01:17 +00003825 LookupResult R(*this, NameInfo, LookupMemberName);
John McCallad00b772010-06-16 08:42:20 +00003826 Result = LookupMemberExpr(R, Base, IsArrow, OpLoc,
3827 SS, ObjCImpDecl, TemplateArgs != 0);
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00003828
John McCallad00b772010-06-16 08:42:20 +00003829 if (Result.isInvalid()) {
3830 Owned(Base);
3831 return ExprError();
3832 }
John McCall129e2df2009-11-30 22:42:35 +00003833
John McCallad00b772010-06-16 08:42:20 +00003834 if (Result.get()) {
3835 // The only way a reference to a destructor can be used is to
3836 // immediately call it, which falls into this case. If the
3837 // next token is not a '(', produce a diagnostic and build the
3838 // call now.
3839 if (!HasTrailingLParen &&
3840 Id.getKind() == UnqualifiedId::IK_DestructorName)
John McCall9ae2f072010-08-23 23:25:46 +00003841 return DiagnoseDtorReference(NameInfo.getLoc(), Result.get());
John McCall129e2df2009-11-30 22:42:35 +00003842
John McCallad00b772010-06-16 08:42:20 +00003843 return move(Result);
John McCall129e2df2009-11-30 22:42:35 +00003844 }
3845
John McCall9ae2f072010-08-23 23:25:46 +00003846 Result = BuildMemberReferenceExpr(Base, Base->getType(),
John McCallc2233c52010-01-15 08:34:02 +00003847 OpLoc, IsArrow, SS, FirstQualifierInScope,
3848 R, TemplateArgs);
John McCall129e2df2009-11-30 22:42:35 +00003849 }
3850
3851 return move(Result);
Anders Carlsson8f28f992009-08-26 18:25:21 +00003852}
3853
John McCall60d7b3a2010-08-24 06:29:42 +00003854ExprResult Sema::BuildCXXDefaultArgExpr(SourceLocation CallLoc,
Nico Weber08e41a62010-11-29 18:19:25 +00003855 FunctionDecl *FD,
3856 ParmVarDecl *Param) {
Anders Carlsson56c5e332009-08-25 03:49:14 +00003857 if (Param->hasUnparsedDefaultArg()) {
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003858 Diag(CallLoc,
Nico Weber15d5c832010-11-30 04:44:33 +00003859 diag::err_use_of_default_argument_to_function_declared_later) <<
Anders Carlsson56c5e332009-08-25 03:49:14 +00003860 FD << cast<CXXRecordDecl>(FD->getDeclContext())->getDeclName();
Mike Stump1eb44332009-09-09 15:08:12 +00003861 Diag(UnparsedDefaultArgLocs[Param],
Nico Weber15d5c832010-11-30 04:44:33 +00003862 diag::note_default_argument_declared_here);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003863 return ExprError();
3864 }
3865
3866 if (Param->hasUninstantiatedDefaultArg()) {
3867 Expr *UninstExpr = Param->getUninstantiatedDefaultArg();
Anders Carlsson56c5e332009-08-25 03:49:14 +00003868
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003869 // Instantiate the expression.
3870 MultiLevelTemplateArgumentList ArgList
3871 = getTemplateInstantiationArgs(FD, 0, /*RelativeToPrimary=*/true);
Anders Carlsson25cae7f2009-09-05 05:14:19 +00003872
Nico Weber08e41a62010-11-29 18:19:25 +00003873 std::pair<const TemplateArgument *, unsigned> Innermost
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003874 = ArgList.getInnermost();
3875 InstantiatingTemplate Inst(*this, CallLoc, Param, Innermost.first,
3876 Innermost.second);
Anders Carlsson56c5e332009-08-25 03:49:14 +00003877
Nico Weber08e41a62010-11-29 18:19:25 +00003878 ExprResult Result;
3879 {
3880 // C++ [dcl.fct.default]p5:
3881 // The names in the [default argument] expression are bound, and
3882 // the semantic constraints are checked, at the point where the
3883 // default argument expression appears.
Nico Weber15d5c832010-11-30 04:44:33 +00003884 ContextRAII SavedContext(*this, FD);
Nico Weber08e41a62010-11-29 18:19:25 +00003885 Result = SubstExpr(UninstExpr, ArgList);
3886 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003887 if (Result.isInvalid())
3888 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00003889
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003890 // Check the expression as an initializer for the parameter.
3891 InitializedEntity Entity
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00003892 = InitializedEntity::InitializeParameter(Context, Param);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003893 InitializationKind Kind
3894 = InitializationKind::CreateCopy(Param->getLocation(),
3895 /*FIXME:EqualLoc*/UninstExpr->getSourceRange().getBegin());
3896 Expr *ResultE = Result.takeAs<Expr>();
Douglas Gregor65222e82009-12-23 18:19:08 +00003897
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003898 InitializationSequence InitSeq(*this, Entity, Kind, &ResultE, 1);
3899 Result = InitSeq.Perform(*this, Entity, Kind,
3900 MultiExprArg(*this, &ResultE, 1));
3901 if (Result.isInvalid())
3902 return ExprError();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003903
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003904 // Build the default argument expression.
3905 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param,
3906 Result.takeAs<Expr>()));
Anders Carlsson56c5e332009-08-25 03:49:14 +00003907 }
3908
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003909 // If the default expression creates temporaries, we need to
3910 // push them to the current stack of expression temporaries so they'll
3911 // be properly destroyed.
3912 // FIXME: We should really be rebuilding the default argument with new
3913 // bound temporaries; see the comment in PR5810.
Douglas Gregor5833b0b2010-09-14 22:55:20 +00003914 for (unsigned i = 0, e = Param->getNumDefaultArgTemporaries(); i != e; ++i) {
3915 CXXTemporary *Temporary = Param->getDefaultArgTemporary(i);
3916 MarkDeclarationReferenced(Param->getDefaultArg()->getLocStart(),
3917 const_cast<CXXDestructorDecl*>(Temporary->getDestructor()));
3918 ExprTemporaries.push_back(Temporary);
3919 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003920
3921 // We already type-checked the argument, so we know it works.
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00003922 // Just mark all of the declarations in this potentially-evaluated expression
3923 // as being "referenced".
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00003924 MarkDeclarationsReferencedInExpr(Param->getDefaultArg());
Douglas Gregor036aed12009-12-23 23:03:06 +00003925 return Owned(CXXDefaultArgExpr::Create(Context, CallLoc, Param));
Anders Carlsson56c5e332009-08-25 03:49:14 +00003926}
3927
Douglas Gregor88a35142008-12-22 05:46:06 +00003928/// ConvertArgumentsForCall - Converts the arguments specified in
3929/// Args/NumArgs to the parameter types of the function FDecl with
3930/// function prototype Proto. Call is the call expression itself, and
3931/// Fn is the function expression. For a C++ member function, this
3932/// routine does not attempt to convert the object argument. Returns
3933/// true if the call is ill-formed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00003934bool
3935Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn,
Douglas Gregor88a35142008-12-22 05:46:06 +00003936 FunctionDecl *FDecl,
Douglas Gregor72564e72009-02-26 23:50:07 +00003937 const FunctionProtoType *Proto,
Douglas Gregor88a35142008-12-22 05:46:06 +00003938 Expr **Args, unsigned NumArgs,
3939 SourceLocation RParenLoc) {
Mike Stumpeed9cac2009-02-19 03:04:26 +00003940 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by
Douglas Gregor88a35142008-12-22 05:46:06 +00003941 // assignment, to the types of the corresponding parameter, ...
3942 unsigned NumArgsInProto = Proto->getNumArgs();
Douglas Gregor3fd56d72009-01-23 21:30:56 +00003943 bool Invalid = false;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003944
Douglas Gregor88a35142008-12-22 05:46:06 +00003945 // If too few arguments are available (and we don't have default
3946 // arguments for the remaining parameters), don't make the call.
3947 if (NumArgs < NumArgsInProto) {
3948 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments())
3949 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args)
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00003950 << Fn->getType()->isBlockPointerType()
Eric Christopherd77b9a22010-04-16 04:48:22 +00003951 << NumArgsInProto << NumArgs << Fn->getSourceRange();
Ted Kremenek8189cde2009-02-07 01:47:29 +00003952 Call->setNumArgs(Context, NumArgsInProto);
Douglas Gregor88a35142008-12-22 05:46:06 +00003953 }
3954
3955 // If too many are passed and not variadic, error on the extras and drop
3956 // them.
3957 if (NumArgs > NumArgsInProto) {
3958 if (!Proto->isVariadic()) {
3959 Diag(Args[NumArgsInProto]->getLocStart(),
3960 diag::err_typecheck_call_too_many_args)
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00003961 << Fn->getType()->isBlockPointerType()
Eric Christopherccfa9632010-04-16 04:56:46 +00003962 << NumArgsInProto << NumArgs << Fn->getSourceRange()
Douglas Gregor88a35142008-12-22 05:46:06 +00003963 << SourceRange(Args[NumArgsInProto]->getLocStart(),
3964 Args[NumArgs-1]->getLocEnd());
3965 // This deletes the extra arguments.
Ted Kremenek8189cde2009-02-07 01:47:29 +00003966 Call->setNumArgs(Context, NumArgsInProto);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003967 return true;
Douglas Gregor88a35142008-12-22 05:46:06 +00003968 }
Douglas Gregor88a35142008-12-22 05:46:06 +00003969 }
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003970 llvm::SmallVector<Expr *, 8> AllArgs;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003971 VariadicCallType CallType =
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00003972 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
3973 if (Fn->getType()->isBlockPointerType())
3974 CallType = VariadicBlock; // Block
3975 else if (isa<MemberExpr>(Fn))
3976 CallType = VariadicMethod;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003977 Invalid = GatherArgumentsForCall(Call->getSourceRange().getBegin(), FDecl,
Fariborz Jahanian2fe168f2009-11-24 21:37:28 +00003978 Proto, 0, Args, NumArgs, AllArgs, CallType);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003979 if (Invalid)
3980 return true;
3981 unsigned TotalNumArgs = AllArgs.size();
3982 for (unsigned i = 0; i < TotalNumArgs; ++i)
3983 Call->setArg(i, AllArgs[i]);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00003984
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003985 return false;
3986}
Mike Stumpeed9cac2009-02-19 03:04:26 +00003987
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003988bool Sema::GatherArgumentsForCall(SourceLocation CallLoc,
3989 FunctionDecl *FDecl,
3990 const FunctionProtoType *Proto,
3991 unsigned FirstProtoArg,
3992 Expr **Args, unsigned NumArgs,
3993 llvm::SmallVector<Expr *, 8> &AllArgs,
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00003994 VariadicCallType CallType) {
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00003995 unsigned NumArgsInProto = Proto->getNumArgs();
3996 unsigned NumArgsToCheck = NumArgs;
3997 bool Invalid = false;
3998 if (NumArgs != NumArgsInProto)
3999 // Use default arguments for missing arguments
4000 NumArgsToCheck = NumArgsInProto;
4001 unsigned ArgIx = 0;
Douglas Gregor88a35142008-12-22 05:46:06 +00004002 // Continue to check argument types (even if we have too few/many args).
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004003 for (unsigned i = FirstProtoArg; i != NumArgsToCheck; i++) {
Douglas Gregor88a35142008-12-22 05:46:06 +00004004 QualType ProtoArgType = Proto->getArgType(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004005
Douglas Gregor88a35142008-12-22 05:46:06 +00004006 Expr *Arg;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004007 if (ArgIx < NumArgs) {
4008 Arg = Args[ArgIx++];
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004009
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00004010 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
4011 ProtoArgType,
Anders Carlssonb7906612009-08-26 23:45:07 +00004012 PDiag(diag::err_call_incomplete_argument)
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004013 << Arg->getSourceRange()))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00004014 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004015
Douglas Gregora188ff22009-12-22 16:09:06 +00004016 // Pass the argument
4017 ParmVarDecl *Param = 0;
4018 if (FDecl && i < FDecl->getNumParams())
4019 Param = FDecl->getParamDecl(i);
Douglas Gregoraa037312009-12-22 07:24:36 +00004020
Douglas Gregora188ff22009-12-22 16:09:06 +00004021 InitializedEntity Entity =
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00004022 Param? InitializedEntity::InitializeParameter(Context, Param)
4023 : InitializedEntity::InitializeParameter(Context, ProtoArgType);
John McCall60d7b3a2010-08-24 06:29:42 +00004024 ExprResult ArgE = PerformCopyInitialization(Entity,
Douglas Gregora188ff22009-12-22 16:09:06 +00004025 SourceLocation(),
4026 Owned(Arg));
4027 if (ArgE.isInvalid())
4028 return true;
4029
4030 Arg = ArgE.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00004031 } else {
Anders Carlssoned961f92009-08-25 02:29:20 +00004032 ParmVarDecl *Param = FDecl->getParamDecl(i);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004033
John McCall60d7b3a2010-08-24 06:29:42 +00004034 ExprResult ArgExpr =
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004035 BuildCXXDefaultArgExpr(CallLoc, FDecl, Param);
Anders Carlsson56c5e332009-08-25 03:49:14 +00004036 if (ArgExpr.isInvalid())
4037 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004038
Anders Carlsson56c5e332009-08-25 03:49:14 +00004039 Arg = ArgExpr.takeAs<Expr>();
Anders Carlsson5e300d12009-06-12 16:51:40 +00004040 }
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004041 AllArgs.push_back(Arg);
Douglas Gregor88a35142008-12-22 05:46:06 +00004042 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004043
Douglas Gregor88a35142008-12-22 05:46:06 +00004044 // If this is a variadic call, handle args passed through "...".
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +00004045 if (CallType != VariadicDoesNotApply) {
Douglas Gregor88a35142008-12-22 05:46:06 +00004046 // Promote the arguments (C99 6.5.2.2p7).
Chris Lattner40378332010-05-16 04:01:30 +00004047 for (unsigned i = ArgIx; i != NumArgs; ++i) {
Douglas Gregor88a35142008-12-22 05:46:06 +00004048 Expr *Arg = Args[i];
Chris Lattner40378332010-05-16 04:01:30 +00004049 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType, FDecl);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +00004050 AllArgs.push_back(Arg);
Douglas Gregor88a35142008-12-22 05:46:06 +00004051 }
4052 }
Douglas Gregor3fd56d72009-01-23 21:30:56 +00004053 return Invalid;
Douglas Gregor88a35142008-12-22 05:46:06 +00004054}
4055
Steve Narofff69936d2007-09-16 03:34:24 +00004056/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments.
Reid Spencer5f016e22007-07-11 17:01:13 +00004057/// This provides the location of the left/right parens and a list of comma
4058/// locations.
John McCall60d7b3a2010-08-24 06:29:42 +00004059ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00004060Sema::ActOnCallExpr(Scope *S, Expr *Fn, SourceLocation LParenLoc,
Douglas Gregora1a04782010-09-09 16:33:13 +00004061 MultiExprArg args, SourceLocation RParenLoc) {
Sebastian Redl0eb23302009-01-19 00:08:26 +00004062 unsigned NumArgs = args.size();
Nate Begeman2ef13e52009-08-10 23:49:36 +00004063
4064 // Since this might be a postfix expression, get rid of ParenListExprs.
John McCall60d7b3a2010-08-24 06:29:42 +00004065 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Fn);
John McCall9ae2f072010-08-23 23:25:46 +00004066 if (Result.isInvalid()) return ExprError();
4067 Fn = Result.take();
Mike Stump1eb44332009-09-09 15:08:12 +00004068
John McCall9ae2f072010-08-23 23:25:46 +00004069 Expr **Args = args.release();
Mike Stump1eb44332009-09-09 15:08:12 +00004070
Douglas Gregor88a35142008-12-22 05:46:06 +00004071 if (getLangOptions().CPlusPlus) {
Douglas Gregora71d8192009-09-04 17:36:40 +00004072 // If this is a pseudo-destructor expression, build the call immediately.
4073 if (isa<CXXPseudoDestructorExpr>(Fn)) {
4074 if (NumArgs > 0) {
4075 // Pseudo-destructor calls should not have any arguments.
4076 Diag(Fn->getLocStart(), diag::err_pseudo_dtor_call_with_args)
Douglas Gregor849b2432010-03-31 17:46:05 +00004077 << FixItHint::CreateRemoval(
Douglas Gregora71d8192009-09-04 17:36:40 +00004078 SourceRange(Args[0]->getLocStart(),
4079 Args[NumArgs-1]->getLocEnd()));
Mike Stump1eb44332009-09-09 15:08:12 +00004080
Douglas Gregora71d8192009-09-04 17:36:40 +00004081 NumArgs = 0;
4082 }
Mike Stump1eb44332009-09-09 15:08:12 +00004083
Douglas Gregora71d8192009-09-04 17:36:40 +00004084 return Owned(new (Context) CallExpr(Context, Fn, 0, 0, Context.VoidTy,
John McCallf89e55a2010-11-18 06:31:45 +00004085 VK_RValue, RParenLoc));
Douglas Gregora71d8192009-09-04 17:36:40 +00004086 }
Mike Stump1eb44332009-09-09 15:08:12 +00004087
Douglas Gregor17330012009-02-04 15:01:18 +00004088 // Determine whether this is a dependent call inside a C++ template,
Mike Stumpeed9cac2009-02-19 03:04:26 +00004089 // in which case we won't do any semantic analysis now.
Mike Stump390b4cc2009-05-16 07:39:55 +00004090 // FIXME: Will need to cache the results of name lookup (including ADL) in
4091 // Fn.
Douglas Gregor17330012009-02-04 15:01:18 +00004092 bool Dependent = false;
4093 if (Fn->isTypeDependent())
4094 Dependent = true;
4095 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs))
4096 Dependent = true;
4097
4098 if (Dependent)
Ted Kremenek668bf912009-02-09 20:51:47 +00004099 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs,
John McCallf89e55a2010-11-18 06:31:45 +00004100 Context.DependentTy, VK_RValue,
4101 RParenLoc));
Douglas Gregor17330012009-02-04 15:01:18 +00004102
4103 // Determine whether this is a call to an object (C++ [over.call.object]).
4104 if (Fn->getType()->isRecordType())
4105 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00004106 RParenLoc));
Douglas Gregor17330012009-02-04 15:01:18 +00004107
John McCall129e2df2009-11-30 22:42:35 +00004108 Expr *NakedFn = Fn->IgnoreParens();
4109
4110 // Determine whether this is a call to an unresolved member function.
4111 if (UnresolvedMemberExpr *MemE = dyn_cast<UnresolvedMemberExpr>(NakedFn)) {
4112 // If lookup was unresolved but not dependent (i.e. didn't find
4113 // an unresolved using declaration), it has to be an overloaded
4114 // function set, which means it must contain either multiple
4115 // declarations (all methods or method templates) or a single
4116 // method template.
4117 assert((MemE->getNumDecls() > 1) ||
Douglas Gregor2b147f02010-04-25 21:15:30 +00004118 isa<FunctionTemplateDecl>(
4119 (*MemE->decls_begin())->getUnderlyingDecl()));
Douglas Gregor958aeb02009-12-01 03:34:29 +00004120 (void)MemE;
John McCall129e2df2009-11-30 22:42:35 +00004121
John McCallaa81e162009-12-01 22:10:20 +00004122 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00004123 RParenLoc);
John McCall129e2df2009-11-30 22:42:35 +00004124 }
4125
Douglas Gregorfa047642009-02-04 00:32:51 +00004126 // Determine whether this is a call to a member function.
John McCall129e2df2009-11-30 22:42:35 +00004127 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(NakedFn)) {
Douglas Gregore53060f2009-06-25 22:08:12 +00004128 NamedDecl *MemDecl = MemExpr->getMemberDecl();
John McCall129e2df2009-11-30 22:42:35 +00004129 if (isa<CXXMethodDecl>(MemDecl))
John McCallaa81e162009-12-01 22:10:20 +00004130 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs,
Douglas Gregora1a04782010-09-09 16:33:13 +00004131 RParenLoc);
Douglas Gregore53060f2009-06-25 22:08:12 +00004132 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004133
Anders Carlsson83ccfc32009-10-03 17:40:22 +00004134 // Determine whether this is a call to a pointer-to-member function.
John McCall129e2df2009-11-30 22:42:35 +00004135 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(NakedFn)) {
John McCall2de56d12010-08-25 11:45:40 +00004136 if (BO->getOpcode() == BO_PtrMemD ||
4137 BO->getOpcode() == BO_PtrMemI) {
Douglas Gregor5f970ee2010-05-04 18:18:31 +00004138 if (const FunctionProtoType *FPT
4139 = BO->getType()->getAs<FunctionProtoType>()) {
Douglas Gregor5291c3c2010-07-13 08:18:22 +00004140 QualType ResultTy = FPT->getCallResultType(Context);
John McCallf89e55a2010-11-18 06:31:45 +00004141 ExprValueKind VK = Expr::getValueKindForType(FPT->getResultType());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004142
John McCall9ae2f072010-08-23 23:25:46 +00004143 CXXMemberCallExpr *TheCall
4144 = new (Context) CXXMemberCallExpr(Context, BO, Args,
John McCallf89e55a2010-11-18 06:31:45 +00004145 NumArgs, ResultTy, VK,
John McCall9ae2f072010-08-23 23:25:46 +00004146 RParenLoc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004147
4148 if (CheckCallReturnType(FPT->getResultType(),
4149 BO->getRHS()->getSourceRange().getBegin(),
John McCall9ae2f072010-08-23 23:25:46 +00004150 TheCall, 0))
Fariborz Jahanian5de24502009-10-28 16:49:46 +00004151 return ExprError();
Anders Carlsson8d6d90d2009-10-15 00:41:48 +00004152
John McCall9ae2f072010-08-23 23:25:46 +00004153 if (ConvertArgumentsForCall(TheCall, BO, 0, FPT, Args, NumArgs,
Fariborz Jahanian5de24502009-10-28 16:49:46 +00004154 RParenLoc))
4155 return ExprError();
Anders Carlsson83ccfc32009-10-03 17:40:22 +00004156
John McCall9ae2f072010-08-23 23:25:46 +00004157 return MaybeBindToTemporary(TheCall);
Fariborz Jahanian5de24502009-10-28 16:49:46 +00004158 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004159 return ExprError(Diag(Fn->getLocStart(),
Fariborz Jahanian5de24502009-10-28 16:49:46 +00004160 diag::err_typecheck_call_not_function)
4161 << Fn->getType() << Fn->getSourceRange());
Anders Carlsson83ccfc32009-10-03 17:40:22 +00004162 }
4163 }
Douglas Gregor88a35142008-12-22 05:46:06 +00004164 }
4165
Douglas Gregorfa047642009-02-04 00:32:51 +00004166 // If we're directly calling a function, get the appropriate declaration.
Mike Stump1eb44332009-09-09 15:08:12 +00004167 // Also, in C++, keep track of whether we should perform argument-dependent
Douglas Gregor6db8ed42009-06-30 23:57:56 +00004168 // lookup and whether there were any explicitly-specified template arguments.
Mike Stumpeed9cac2009-02-19 03:04:26 +00004169
Eli Friedmanefa42f72009-12-26 03:35:45 +00004170 Expr *NakedFn = Fn->IgnoreParens();
Douglas Gregoref9b1492010-11-09 20:03:54 +00004171 if (isa<UnresolvedLookupExpr>(NakedFn)) {
4172 UnresolvedLookupExpr *ULE = cast<UnresolvedLookupExpr>(NakedFn);
4173 return BuildOverloadedCallExpr(S, Fn, ULE, LParenLoc, Args, NumArgs,
4174 RParenLoc);
4175 }
4176
John McCall3b4294e2009-12-16 12:17:52 +00004177 NamedDecl *NDecl = 0;
Douglas Gregord8f0ade2010-10-25 20:48:33 +00004178 if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(NakedFn))
4179 if (UnOp->getOpcode() == UO_AddrOf)
4180 NakedFn = UnOp->getSubExpr()->IgnoreParens();
4181
John McCall3b4294e2009-12-16 12:17:52 +00004182 if (isa<DeclRefExpr>(NakedFn))
4183 NDecl = cast<DeclRefExpr>(NakedFn)->getDecl();
4184
John McCallaa81e162009-12-01 22:10:20 +00004185 return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, Args, NumArgs, RParenLoc);
4186}
4187
John McCall3b4294e2009-12-16 12:17:52 +00004188/// BuildResolvedCallExpr - Build a call to a resolved expression,
4189/// i.e. an expression not of \p OverloadTy. The expression should
John McCallaa81e162009-12-01 22:10:20 +00004190/// unary-convert to an expression of function-pointer or
4191/// block-pointer type.
4192///
4193/// \param NDecl the declaration being called, if available
John McCall60d7b3a2010-08-24 06:29:42 +00004194ExprResult
John McCallaa81e162009-12-01 22:10:20 +00004195Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
4196 SourceLocation LParenLoc,
4197 Expr **Args, unsigned NumArgs,
4198 SourceLocation RParenLoc) {
4199 FunctionDecl *FDecl = dyn_cast_or_null<FunctionDecl>(NDecl);
4200
Chris Lattner04421082008-04-08 04:40:51 +00004201 // Promote the function operand.
4202 UsualUnaryConversions(Fn);
4203
Chris Lattner925e60d2007-12-28 05:29:59 +00004204 // Make the call expr early, before semantic checks. This guarantees cleanup
4205 // of arguments and function on error.
John McCall9ae2f072010-08-23 23:25:46 +00004206 CallExpr *TheCall = new (Context) CallExpr(Context, Fn,
4207 Args, NumArgs,
4208 Context.BoolTy,
John McCallf89e55a2010-11-18 06:31:45 +00004209 VK_RValue,
John McCall9ae2f072010-08-23 23:25:46 +00004210 RParenLoc);
Sebastian Redl0eb23302009-01-19 00:08:26 +00004211
Steve Naroffdd972f22008-09-05 22:11:13 +00004212 const FunctionType *FuncT;
4213 if (!Fn->getType()->isBlockPointerType()) {
4214 // C99 6.5.2.2p1 - "The expression that denotes the called function shall
4215 // have type pointer to function".
Ted Kremenek6217b802009-07-29 21:53:49 +00004216 const PointerType *PT = Fn->getType()->getAs<PointerType>();
Steve Naroffdd972f22008-09-05 22:11:13 +00004217 if (PT == 0)
Sebastian Redl0eb23302009-01-19 00:08:26 +00004218 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
4219 << Fn->getType() << Fn->getSourceRange());
John McCall183700f2009-09-21 23:43:11 +00004220 FuncT = PT->getPointeeType()->getAs<FunctionType>();
Steve Naroffdd972f22008-09-05 22:11:13 +00004221 } else { // This is a block call.
Ted Kremenek6217b802009-07-29 21:53:49 +00004222 FuncT = Fn->getType()->getAs<BlockPointerType>()->getPointeeType()->
John McCall183700f2009-09-21 23:43:11 +00004223 getAs<FunctionType>();
Steve Naroffdd972f22008-09-05 22:11:13 +00004224 }
Chris Lattner925e60d2007-12-28 05:29:59 +00004225 if (FuncT == 0)
Sebastian Redl0eb23302009-01-19 00:08:26 +00004226 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function)
4227 << Fn->getType() << Fn->getSourceRange());
4228
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00004229 // Check for a valid return type
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004230 if (CheckCallReturnType(FuncT->getResultType(),
John McCall9ae2f072010-08-23 23:25:46 +00004231 Fn->getSourceRange().getBegin(), TheCall,
Anders Carlsson8c8d9192009-10-09 23:51:55 +00004232 FDecl))
Eli Friedmane7c6f7a2009-03-22 22:00:50 +00004233 return ExprError();
4234
Chris Lattner925e60d2007-12-28 05:29:59 +00004235 // We know the result type of the call, set it.
Douglas Gregor5291c3c2010-07-13 08:18:22 +00004236 TheCall->setType(FuncT->getCallResultType(Context));
John McCallf89e55a2010-11-18 06:31:45 +00004237 TheCall->setValueKind(Expr::getValueKindForType(FuncT->getResultType()));
Sebastian Redl0eb23302009-01-19 00:08:26 +00004238
Douglas Gregor72564e72009-02-26 23:50:07 +00004239 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) {
John McCall9ae2f072010-08-23 23:25:46 +00004240 if (ConvertArgumentsForCall(TheCall, Fn, FDecl, Proto, Args, NumArgs,
Douglas Gregor88a35142008-12-22 05:46:06 +00004241 RParenLoc))
Sebastian Redl0eb23302009-01-19 00:08:26 +00004242 return ExprError();
Chris Lattner925e60d2007-12-28 05:29:59 +00004243 } else {
Douglas Gregor72564e72009-02-26 23:50:07 +00004244 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!");
Sebastian Redl0eb23302009-01-19 00:08:26 +00004245
Douglas Gregor74734d52009-04-02 15:37:10 +00004246 if (FDecl) {
4247 // Check if we have too few/too many template arguments, based
4248 // on our knowledge of the function definition.
4249 const FunctionDecl *Def = 0;
Argyrios Kyrtzidis06a54a32010-07-07 11:31:19 +00004250 if (FDecl->hasBody(Def) && NumArgs != Def->param_size()) {
Douglas Gregor46542412010-10-25 20:39:23 +00004251 const FunctionProtoType *Proto
4252 = Def->getType()->getAs<FunctionProtoType>();
4253 if (!Proto || !(Proto->isVariadic() && NumArgs >= Def->param_size()))
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00004254 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments)
4255 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange();
Eli Friedmanbc4e29f2009-06-01 09:24:59 +00004256 }
Douglas Gregor46542412010-10-25 20:39:23 +00004257
4258 // If the function we're calling isn't a function prototype, but we have
4259 // a function prototype from a prior declaratiom, use that prototype.
4260 if (!FDecl->hasPrototype())
4261 Proto = FDecl->getType()->getAs<FunctionProtoType>();
Douglas Gregor74734d52009-04-02 15:37:10 +00004262 }
4263
Steve Naroffb291ab62007-08-28 23:30:39 +00004264 // Promote the arguments (C99 6.5.2.2p6).
Chris Lattner925e60d2007-12-28 05:29:59 +00004265 for (unsigned i = 0; i != NumArgs; i++) {
4266 Expr *Arg = Args[i];
Douglas Gregor46542412010-10-25 20:39:23 +00004267
4268 if (Proto && i < Proto->getNumArgs()) {
Douglas Gregor46542412010-10-25 20:39:23 +00004269 InitializedEntity Entity
4270 = InitializedEntity::InitializeParameter(Context,
4271 Proto->getArgType(i));
4272 ExprResult ArgE = PerformCopyInitialization(Entity,
4273 SourceLocation(),
4274 Owned(Arg));
4275 if (ArgE.isInvalid())
4276 return true;
4277
4278 Arg = ArgE.takeAs<Expr>();
4279
4280 } else {
4281 DefaultArgumentPromotion(Arg);
Douglas Gregor46542412010-10-25 20:39:23 +00004282 }
4283
Douglas Gregor0700bbf2010-10-26 05:45:40 +00004284 if (RequireCompleteType(Arg->getSourceRange().getBegin(),
4285 Arg->getType(),
4286 PDiag(diag::err_call_incomplete_argument)
4287 << Arg->getSourceRange()))
4288 return ExprError();
4289
Chris Lattner925e60d2007-12-28 05:29:59 +00004290 TheCall->setArg(i, Arg);
Steve Naroffb291ab62007-08-28 23:30:39 +00004291 }
Reid Spencer5f016e22007-07-11 17:01:13 +00004292 }
Chris Lattner925e60d2007-12-28 05:29:59 +00004293
Douglas Gregor88a35142008-12-22 05:46:06 +00004294 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl))
4295 if (!Method->isStatic())
Sebastian Redl0eb23302009-01-19 00:08:26 +00004296 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object)
4297 << Fn->getSourceRange());
Douglas Gregor88a35142008-12-22 05:46:06 +00004298
Fariborz Jahaniandaf04152009-05-15 20:33:25 +00004299 // Check for sentinels
4300 if (NDecl)
4301 DiagnoseSentinelCalls(NDecl, LParenLoc, Args, NumArgs);
Mike Stump1eb44332009-09-09 15:08:12 +00004302
Chris Lattner59907c42007-08-10 20:18:51 +00004303 // Do special checking on direct calls to functions.
Anders Carlssond406bf02009-08-16 01:56:34 +00004304 if (FDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00004305 if (CheckFunctionCall(FDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00004306 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +00004307
Fariborz Jahanian67aba812010-11-30 17:35:24 +00004308 if (unsigned BuiltinID = FDecl->getBuiltinID())
4309 return CheckBuiltinFunctionCall(BuiltinID, TheCall);
Anders Carlssond406bf02009-08-16 01:56:34 +00004310 } else if (NDecl) {
John McCall9ae2f072010-08-23 23:25:46 +00004311 if (CheckBlockCall(NDecl, TheCall))
Anders Carlssond406bf02009-08-16 01:56:34 +00004312 return ExprError();
4313 }
Chris Lattner59907c42007-08-10 20:18:51 +00004314
John McCall9ae2f072010-08-23 23:25:46 +00004315 return MaybeBindToTemporary(TheCall);
Reid Spencer5f016e22007-07-11 17:01:13 +00004316}
4317
John McCall60d7b3a2010-08-24 06:29:42 +00004318ExprResult
John McCallb3d87482010-08-24 05:47:05 +00004319Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, ParsedType Ty,
John McCall9ae2f072010-08-23 23:25:46 +00004320 SourceLocation RParenLoc, Expr *InitExpr) {
Steve Narofff69936d2007-09-16 03:34:24 +00004321 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type");
Steve Naroffaff1edd2007-07-19 21:32:11 +00004322 // FIXME: put back this assert when initializers are worked out.
Steve Narofff69936d2007-09-16 03:34:24 +00004323 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression");
John McCall42f56b52010-01-18 19:35:47 +00004324
4325 TypeSourceInfo *TInfo;
4326 QualType literalType = GetTypeFromParser(Ty, &TInfo);
4327 if (!TInfo)
4328 TInfo = Context.getTrivialTypeSourceInfo(literalType);
4329
John McCall9ae2f072010-08-23 23:25:46 +00004330 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, InitExpr);
John McCall42f56b52010-01-18 19:35:47 +00004331}
4332
John McCall60d7b3a2010-08-24 06:29:42 +00004333ExprResult
John McCall42f56b52010-01-18 19:35:47 +00004334Sema::BuildCompoundLiteralExpr(SourceLocation LParenLoc, TypeSourceInfo *TInfo,
John McCall9ae2f072010-08-23 23:25:46 +00004335 SourceLocation RParenLoc, Expr *literalExpr) {
John McCall42f56b52010-01-18 19:35:47 +00004336 QualType literalType = TInfo->getType();
Anders Carlssond35c8322007-12-05 07:24:19 +00004337
Eli Friedman6223c222008-05-20 05:22:08 +00004338 if (literalType->isArrayType()) {
Argyrios Kyrtzidise6fe9a22010-11-08 19:14:19 +00004339 if (RequireCompleteType(LParenLoc, Context.getBaseElementType(literalType),
4340 PDiag(diag::err_illegal_decl_array_incomplete_type)
4341 << SourceRange(LParenLoc,
4342 literalExpr->getSourceRange().getEnd())))
4343 return ExprError();
Chris Lattnerc63a1f22008-08-04 07:31:14 +00004344 if (literalType->isVariableArrayType())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004345 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init)
4346 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()));
Douglas Gregor690dc7f2009-05-21 23:48:18 +00004347 } else if (!literalType->isDependentType() &&
4348 RequireCompleteType(LParenLoc, literalType,
Anders Carlssonb7906612009-08-26 23:45:07 +00004349 PDiag(diag::err_typecheck_decl_incomplete_type)
Mike Stump1eb44332009-09-09 15:08:12 +00004350 << SourceRange(LParenLoc,
Anders Carlssonb7906612009-08-26 23:45:07 +00004351 literalExpr->getSourceRange().getEnd())))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004352 return ExprError();
Eli Friedman6223c222008-05-20 05:22:08 +00004353
Douglas Gregor99a2e602009-12-16 01:38:02 +00004354 InitializedEntity Entity
Douglas Gregord6542d82009-12-22 15:35:07 +00004355 = InitializedEntity::InitializeTemporary(literalType);
Douglas Gregor99a2e602009-12-16 01:38:02 +00004356 InitializationKind Kind
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004357 = InitializationKind::CreateCast(SourceRange(LParenLoc, RParenLoc),
Douglas Gregor99a2e602009-12-16 01:38:02 +00004358 /*IsCStyleCast=*/true);
Eli Friedman08544622009-12-22 02:35:53 +00004359 InitializationSequence InitSeq(*this, Entity, Kind, &literalExpr, 1);
John McCall60d7b3a2010-08-24 06:29:42 +00004360 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
John McCallca0408f2010-08-23 06:44:23 +00004361 MultiExprArg(*this, &literalExpr, 1),
Eli Friedman08544622009-12-22 02:35:53 +00004362 &literalType);
4363 if (Result.isInvalid())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004364 return ExprError();
John McCall9ae2f072010-08-23 23:25:46 +00004365 literalExpr = Result.get();
Steve Naroffe9b12192008-01-14 18:19:28 +00004366
Chris Lattner371f2582008-12-04 23:50:19 +00004367 bool isFileScope = getCurFunctionOrMethodDecl() == 0;
Steve Naroffe9b12192008-01-14 18:19:28 +00004368 if (isFileScope) { // 6.5.2.5p3
Steve Naroffd0091aa2008-01-10 22:15:12 +00004369 if (CheckForConstantInitializer(literalExpr, literalType))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004370 return ExprError();
Steve Naroffd0091aa2008-01-10 22:15:12 +00004371 }
Eli Friedman08544622009-12-22 02:35:53 +00004372
John McCallf89e55a2010-11-18 06:31:45 +00004373 // In C, compound literals are l-values for some reason.
4374 ExprValueKind VK = getLangOptions().CPlusPlus ? VK_RValue : VK_LValue;
4375
John McCall1d7d8d62010-01-19 22:33:45 +00004376 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, TInfo, literalType,
John McCallf89e55a2010-11-18 06:31:45 +00004377 VK, literalExpr, isFileScope));
Steve Naroff4aa88f82007-07-19 01:06:55 +00004378}
4379
John McCall60d7b3a2010-08-24 06:29:42 +00004380ExprResult
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004381Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist,
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004382 SourceLocation RBraceLoc) {
4383 unsigned NumInit = initlist.size();
John McCall9ae2f072010-08-23 23:25:46 +00004384 Expr **InitList = initlist.release();
Anders Carlsson66b5a8a2007-08-31 04:56:16 +00004385
Steve Naroff08d92e42007-09-15 18:49:24 +00004386 // Semantic analysis for initializers is done by ActOnDeclarator() and
Mike Stumpeed9cac2009-02-19 03:04:26 +00004387 // CheckInitializer() - it requires knowledge of the object being intialized.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004388
Ted Kremenek709210f2010-04-13 23:39:13 +00004389 InitListExpr *E = new (Context) InitListExpr(Context, LBraceLoc, InitList,
4390 NumInit, RBraceLoc);
Chris Lattnerf0467b32008-04-02 04:24:33 +00004391 E->setType(Context.VoidTy); // FIXME: just a place holder for now.
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004392 return Owned(E);
Steve Naroff4aa88f82007-07-19 01:06:55 +00004393}
4394
John McCallf3ea8cf2010-11-14 08:17:51 +00004395/// Prepares for a scalar cast, performing all the necessary stages
4396/// except the final cast and returning the kind required.
4397static CastKind PrepareScalarCast(Sema &S, Expr *&Src, QualType DestTy) {
4398 // Both Src and Dest are scalar types, i.e. arithmetic or pointer.
4399 // Also, callers should have filtered out the invalid cases with
4400 // pointers. Everything else should be possible.
4401
John McCall404cd162010-11-13 01:35:44 +00004402 QualType SrcTy = Src->getType();
John McCallf3ea8cf2010-11-14 08:17:51 +00004403 if (S.Context.hasSameUnqualifiedType(SrcTy, DestTy))
John McCall2de56d12010-08-25 11:45:40 +00004404 return CK_NoOp;
Anders Carlsson82debc72009-10-18 18:12:03 +00004405
John McCalldaa8e4e2010-11-15 09:13:47 +00004406 switch (SrcTy->getScalarTypeKind()) {
4407 case Type::STK_MemberPointer:
4408 llvm_unreachable("member pointer type in C");
4409
4410 case Type::STK_Pointer:
4411 switch (DestTy->getScalarTypeKind()) {
4412 case Type::STK_Pointer:
4413 return DestTy->isObjCObjectPointerType() ?
John McCallf3ea8cf2010-11-14 08:17:51 +00004414 CK_AnyPointerToObjCPointerCast :
4415 CK_BitCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00004416 case Type::STK_Bool:
4417 return CK_PointerToBoolean;
4418 case Type::STK_Integral:
4419 return CK_PointerToIntegral;
4420 case Type::STK_Floating:
4421 case Type::STK_FloatingComplex:
4422 case Type::STK_IntegralComplex:
4423 case Type::STK_MemberPointer:
4424 llvm_unreachable("illegal cast from pointer");
4425 }
4426 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004427
John McCalldaa8e4e2010-11-15 09:13:47 +00004428 case Type::STK_Bool: // casting from bool is like casting from an integer
4429 case Type::STK_Integral:
4430 switch (DestTy->getScalarTypeKind()) {
4431 case Type::STK_Pointer:
John McCallf3ea8cf2010-11-14 08:17:51 +00004432 if (Src->isNullPointerConstant(S.Context, Expr::NPC_ValueDependentIsNull))
John McCall404cd162010-11-13 01:35:44 +00004433 return CK_NullToPointer;
John McCall2de56d12010-08-25 11:45:40 +00004434 return CK_IntegralToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00004435 case Type::STK_Bool:
4436 return CK_IntegralToBoolean;
4437 case Type::STK_Integral:
John McCallf3ea8cf2010-11-14 08:17:51 +00004438 return CK_IntegralCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00004439 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00004440 return CK_IntegralToFloating;
John McCalldaa8e4e2010-11-15 09:13:47 +00004441 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004442 return CK_IntegralRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004443 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004444 S.ImpCastExprToType(Src, cast<ComplexType>(DestTy)->getElementType(),
4445 CK_IntegralToFloating);
4446 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004447 case Type::STK_MemberPointer:
4448 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004449 }
4450 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004451
John McCalldaa8e4e2010-11-15 09:13:47 +00004452 case Type::STK_Floating:
4453 switch (DestTy->getScalarTypeKind()) {
4454 case Type::STK_Floating:
John McCall2de56d12010-08-25 11:45:40 +00004455 return CK_FloatingCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00004456 case Type::STK_Bool:
4457 return CK_FloatingToBoolean;
4458 case Type::STK_Integral:
John McCall2de56d12010-08-25 11:45:40 +00004459 return CK_FloatingToIntegral;
John McCalldaa8e4e2010-11-15 09:13:47 +00004460 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004461 return CK_FloatingRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004462 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004463 S.ImpCastExprToType(Src, cast<ComplexType>(DestTy)->getElementType(),
4464 CK_FloatingToIntegral);
4465 return CK_IntegralRealToComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004466 case Type::STK_Pointer:
4467 llvm_unreachable("valid float->pointer cast?");
4468 case Type::STK_MemberPointer:
4469 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004470 }
4471 break;
4472
John McCalldaa8e4e2010-11-15 09:13:47 +00004473 case Type::STK_FloatingComplex:
4474 switch (DestTy->getScalarTypeKind()) {
4475 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004476 return CK_FloatingComplexCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00004477 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004478 return CK_FloatingComplexToIntegralComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004479 case Type::STK_Floating:
John McCallf3ea8cf2010-11-14 08:17:51 +00004480 return CK_FloatingComplexToReal;
John McCalldaa8e4e2010-11-15 09:13:47 +00004481 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00004482 return CK_FloatingComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00004483 case Type::STK_Integral:
John McCallf3ea8cf2010-11-14 08:17:51 +00004484 S.ImpCastExprToType(Src, cast<ComplexType>(SrcTy)->getElementType(),
4485 CK_FloatingComplexToReal);
4486 return CK_FloatingToIntegral;
John McCalldaa8e4e2010-11-15 09:13:47 +00004487 case Type::STK_Pointer:
4488 llvm_unreachable("valid complex float->pointer cast?");
4489 case Type::STK_MemberPointer:
4490 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004491 }
4492 break;
4493
John McCalldaa8e4e2010-11-15 09:13:47 +00004494 case Type::STK_IntegralComplex:
4495 switch (DestTy->getScalarTypeKind()) {
4496 case Type::STK_FloatingComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004497 return CK_IntegralComplexToFloatingComplex;
John McCalldaa8e4e2010-11-15 09:13:47 +00004498 case Type::STK_IntegralComplex:
John McCallf3ea8cf2010-11-14 08:17:51 +00004499 return CK_IntegralComplexCast;
John McCalldaa8e4e2010-11-15 09:13:47 +00004500 case Type::STK_Integral:
John McCallf3ea8cf2010-11-14 08:17:51 +00004501 return CK_IntegralComplexToReal;
John McCalldaa8e4e2010-11-15 09:13:47 +00004502 case Type::STK_Bool:
John McCallf3ea8cf2010-11-14 08:17:51 +00004503 return CK_IntegralComplexToBoolean;
John McCalldaa8e4e2010-11-15 09:13:47 +00004504 case Type::STK_Floating:
John McCallf3ea8cf2010-11-14 08:17:51 +00004505 S.ImpCastExprToType(Src, cast<ComplexType>(SrcTy)->getElementType(),
4506 CK_IntegralComplexToReal);
4507 return CK_IntegralToFloating;
John McCalldaa8e4e2010-11-15 09:13:47 +00004508 case Type::STK_Pointer:
4509 llvm_unreachable("valid complex int->pointer cast?");
4510 case Type::STK_MemberPointer:
4511 llvm_unreachable("member pointer type in C");
John McCallf3ea8cf2010-11-14 08:17:51 +00004512 }
4513 break;
Anders Carlsson82debc72009-10-18 18:12:03 +00004514 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004515
John McCallf3ea8cf2010-11-14 08:17:51 +00004516 llvm_unreachable("Unhandled scalar cast");
4517 return CK_BitCast;
Anders Carlsson82debc72009-10-18 18:12:03 +00004518}
4519
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00004520/// CheckCastTypes - Check type constraints for casting between types.
John McCallf89e55a2010-11-18 06:31:45 +00004521bool Sema::CheckCastTypes(SourceRange TyR, QualType castType,
4522 Expr *&castExpr, CastKind& Kind, ExprValueKind &VK,
4523 CXXCastPath &BasePath, bool FunctionalStyle) {
Sebastian Redl9cc11e72009-07-25 15:41:38 +00004524 if (getLangOptions().CPlusPlus)
Douglas Gregor40749ee2010-11-03 00:35:38 +00004525 return CXXCheckCStyleCast(SourceRange(TyR.getBegin(),
4526 castExpr->getLocEnd()),
John McCallf89e55a2010-11-18 06:31:45 +00004527 castType, VK, castExpr, Kind, BasePath,
Anders Carlsson5cf86ba2010-04-24 19:06:50 +00004528 FunctionalStyle);
Sebastian Redl9cc11e72009-07-25 15:41:38 +00004529
John McCallf89e55a2010-11-18 06:31:45 +00004530 // We only support r-value casts in C.
4531 VK = VK_RValue;
4532
Douglas Gregora873dfc2010-02-03 00:27:59 +00004533 DefaultFunctionArrayLvalueConversion(castExpr);
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00004534
4535 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression
4536 // type needs to be scalar.
4537 if (castType->isVoidType()) {
4538 // Cast to void allows any expr type.
John McCall2de56d12010-08-25 11:45:40 +00004539 Kind = CK_ToVoid;
Anders Carlssonebeaf202009-10-16 02:35:04 +00004540 return false;
4541 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004542
Eli Friedman8d438082010-07-17 20:43:49 +00004543 if (RequireCompleteType(TyR.getBegin(), castType,
4544 diag::err_typecheck_cast_to_incomplete))
4545 return true;
4546
Anders Carlssonebeaf202009-10-16 02:35:04 +00004547 if (!castType->isScalarType() && !castType->isVectorType()) {
Douglas Gregora4923eb2009-11-16 21:35:15 +00004548 if (Context.hasSameUnqualifiedType(castType, castExpr->getType()) &&
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004549 (castType->isStructureType() || castType->isUnionType())) {
4550 // GCC struct/union extension: allow cast to self.
Eli Friedmanb1d796d2009-03-23 00:24:07 +00004551 // FIXME: Check that the cast destination type is complete.
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004552 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar)
4553 << castType << castExpr->getSourceRange();
John McCall2de56d12010-08-25 11:45:40 +00004554 Kind = CK_NoOp;
Anders Carlssonc3516322009-10-16 02:48:28 +00004555 return false;
4556 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004557
Anders Carlssonc3516322009-10-16 02:48:28 +00004558 if (castType->isUnionType()) {
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004559 // GCC cast to union extension
Ted Kremenek6217b802009-07-29 21:53:49 +00004560 RecordDecl *RD = castType->getAs<RecordType>()->getDecl();
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004561 RecordDecl::field_iterator Field, FieldEnd;
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00004562 for (Field = RD->field_begin(), FieldEnd = RD->field_end();
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004563 Field != FieldEnd; ++Field) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004564 if (Context.hasSameUnqualifiedType(Field->getType(),
Abramo Bagnara8c4bfe52010-10-07 21:20:44 +00004565 castExpr->getType()) &&
4566 !Field->isUnnamedBitfield()) {
Seo Sanghyeoneff2cd52009-01-15 04:51:39 +00004567 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union)
4568 << castExpr->getSourceRange();
4569 break;
4570 }
4571 }
4572 if (Field == FieldEnd)
4573 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type)
4574 << castExpr->getType() << castExpr->getSourceRange();
John McCall2de56d12010-08-25 11:45:40 +00004575 Kind = CK_ToUnion;
Anders Carlssonc3516322009-10-16 02:48:28 +00004576 return false;
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00004577 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004578
Anders Carlssonc3516322009-10-16 02:48:28 +00004579 // Reject any other conversions to non-scalar types.
4580 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar)
4581 << castType << castExpr->getSourceRange();
4582 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004583
John McCallf3ea8cf2010-11-14 08:17:51 +00004584 // The type we're casting to is known to be a scalar or vector.
4585
4586 // Require the operand to be a scalar or vector.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004587 if (!castExpr->getType()->isScalarType() &&
Anders Carlssonc3516322009-10-16 02:48:28 +00004588 !castExpr->getType()->isVectorType()) {
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00004589 return Diag(castExpr->getLocStart(),
4590 diag::err_typecheck_expect_scalar_operand)
Chris Lattnerd1625842008-11-24 06:25:27 +00004591 << castExpr->getType() << castExpr->getSourceRange();
Anders Carlssonc3516322009-10-16 02:48:28 +00004592 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004593
4594 if (castType->isExtVectorType())
Anders Carlsson16a89042009-10-16 05:23:41 +00004595 return CheckExtVectorCast(TyR, castType, castExpr, Kind);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004596
Anders Carlssonc3516322009-10-16 02:48:28 +00004597 if (castType->isVectorType())
4598 return CheckVectorCast(TyR, castType, castExpr->getType(), Kind);
4599 if (castExpr->getType()->isVectorType())
4600 return CheckVectorCast(TyR, castExpr->getType(), castType, Kind);
4601
John McCallf3ea8cf2010-11-14 08:17:51 +00004602 // The source and target types are both scalars, i.e.
4603 // - arithmetic types (fundamental, enum, and complex)
4604 // - all kinds of pointers
4605 // Note that member pointers were filtered out with C++, above.
4606
Anders Carlsson16a89042009-10-16 05:23:41 +00004607 if (isa<ObjCSelectorExpr>(castExpr))
4608 return Diag(castExpr->getLocStart(), diag::err_cast_selector_expr);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004609
John McCallf3ea8cf2010-11-14 08:17:51 +00004610 // If either type is a pointer, the other type has to be either an
4611 // integer or a pointer.
Anders Carlssonc3516322009-10-16 02:48:28 +00004612 if (!castType->isArithmeticType()) {
Eli Friedman41826bb2009-05-01 02:23:58 +00004613 QualType castExprType = castExpr->getType();
Douglas Gregor9d3347a2010-06-16 00:35:25 +00004614 if (!castExprType->isIntegralType(Context) &&
Douglas Gregor2ade35e2010-06-16 00:17:44 +00004615 castExprType->isArithmeticType())
Eli Friedman41826bb2009-05-01 02:23:58 +00004616 return Diag(castExpr->getLocStart(),
4617 diag::err_cast_pointer_from_non_pointer_int)
4618 << castExprType << castExpr->getSourceRange();
4619 } else if (!castExpr->getType()->isArithmeticType()) {
Douglas Gregor9d3347a2010-06-16 00:35:25 +00004620 if (!castType->isIntegralType(Context) && castType->isArithmeticType())
Eli Friedman41826bb2009-05-01 02:23:58 +00004621 return Diag(castExpr->getLocStart(),
4622 diag::err_cast_pointer_to_non_pointer_int)
4623 << castType << castExpr->getSourceRange();
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00004624 }
Anders Carlsson82debc72009-10-18 18:12:03 +00004625
John McCallf3ea8cf2010-11-14 08:17:51 +00004626 Kind = PrepareScalarCast(*this, castExpr, castType);
John McCallb7f4ffe2010-08-12 21:44:57 +00004627
John McCallf3ea8cf2010-11-14 08:17:51 +00004628 if (Kind == CK_BitCast)
John McCallb7f4ffe2010-08-12 21:44:57 +00004629 CheckCastAlign(castExpr, castType, TyR);
4630
Argyrios Kyrtzidis6c2dc4d2008-08-16 20:27:34 +00004631 return false;
4632}
4633
Anders Carlssonc3516322009-10-16 02:48:28 +00004634bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty,
John McCall2de56d12010-08-25 11:45:40 +00004635 CastKind &Kind) {
Anders Carlssona64db8f2007-11-27 05:51:55 +00004636 assert(VectorTy->isVectorType() && "Not a vector type!");
Mike Stumpeed9cac2009-02-19 03:04:26 +00004637
Anders Carlssona64db8f2007-11-27 05:51:55 +00004638 if (Ty->isVectorType() || Ty->isIntegerType()) {
Chris Lattner98be4942008-03-05 18:54:05 +00004639 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty))
Anders Carlssona64db8f2007-11-27 05:51:55 +00004640 return Diag(R.getBegin(),
Mike Stumpeed9cac2009-02-19 03:04:26 +00004641 Ty->isVectorType() ?
Anders Carlssona64db8f2007-11-27 05:51:55 +00004642 diag::err_invalid_conversion_between_vectors :
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00004643 diag::err_invalid_conversion_between_vector_and_integer)
Chris Lattnerd1625842008-11-24 06:25:27 +00004644 << VectorTy << Ty << R;
Anders Carlssona64db8f2007-11-27 05:51:55 +00004645 } else
4646 return Diag(R.getBegin(),
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00004647 diag::err_invalid_conversion_between_vector_and_scalar)
Chris Lattnerd1625842008-11-24 06:25:27 +00004648 << VectorTy << Ty << R;
Mike Stumpeed9cac2009-02-19 03:04:26 +00004649
John McCall2de56d12010-08-25 11:45:40 +00004650 Kind = CK_BitCast;
Anders Carlssona64db8f2007-11-27 05:51:55 +00004651 return false;
4652}
4653
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004654bool Sema::CheckExtVectorCast(SourceRange R, QualType DestTy, Expr *&CastExpr,
John McCall2de56d12010-08-25 11:45:40 +00004655 CastKind &Kind) {
Nate Begeman58d29a42009-06-26 00:50:28 +00004656 assert(DestTy->isExtVectorType() && "Not an extended vector type!");
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004657
Anders Carlsson16a89042009-10-16 05:23:41 +00004658 QualType SrcTy = CastExpr->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004659
Nate Begeman9b10da62009-06-27 22:05:55 +00004660 // If SrcTy is a VectorType, the total size must match to explicitly cast to
4661 // an ExtVectorType.
Nate Begeman58d29a42009-06-26 00:50:28 +00004662 if (SrcTy->isVectorType()) {
4663 if (Context.getTypeSize(DestTy) != Context.getTypeSize(SrcTy))
4664 return Diag(R.getBegin(),diag::err_invalid_conversion_between_ext_vectors)
4665 << DestTy << SrcTy << R;
John McCall2de56d12010-08-25 11:45:40 +00004666 Kind = CK_BitCast;
Nate Begeman58d29a42009-06-26 00:50:28 +00004667 return false;
4668 }
4669
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00004670 // All non-pointer scalars can be cast to ExtVector type. The appropriate
Nate Begeman58d29a42009-06-26 00:50:28 +00004671 // conversion will take place first from scalar to elt type, and then
4672 // splat from elt type to vector.
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00004673 if (SrcTy->isPointerType())
4674 return Diag(R.getBegin(),
4675 diag::err_invalid_conversion_between_vector_and_scalar)
4676 << DestTy << SrcTy << R;
Eli Friedman73c39ab2009-10-20 08:27:19 +00004677
4678 QualType DestElemTy = DestTy->getAs<ExtVectorType>()->getElementType();
4679 ImpCastExprToType(CastExpr, DestElemTy,
John McCallf3ea8cf2010-11-14 08:17:51 +00004680 PrepareScalarCast(*this, CastExpr, DestElemTy));
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004681
John McCall2de56d12010-08-25 11:45:40 +00004682 Kind = CK_VectorSplat;
Nate Begeman58d29a42009-06-26 00:50:28 +00004683 return false;
4684}
4685
John McCall60d7b3a2010-08-24 06:29:42 +00004686ExprResult
John McCallb3d87482010-08-24 05:47:05 +00004687Sema::ActOnCastExpr(Scope *S, SourceLocation LParenLoc, ParsedType Ty,
John McCall9ae2f072010-08-23 23:25:46 +00004688 SourceLocation RParenLoc, Expr *castExpr) {
4689 assert((Ty != 0) && (castExpr != 0) &&
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004690 "ActOnCastExpr(): missing type or expr");
Steve Naroff16beff82007-07-16 23:25:18 +00004691
John McCall9d125032010-01-15 18:39:57 +00004692 TypeSourceInfo *castTInfo;
4693 QualType castType = GetTypeFromParser(Ty, &castTInfo);
4694 if (!castTInfo)
John McCall42f56b52010-01-18 19:35:47 +00004695 castTInfo = Context.getTrivialTypeSourceInfo(castType);
Mike Stump1eb44332009-09-09 15:08:12 +00004696
Nate Begeman2ef13e52009-08-10 23:49:36 +00004697 // If the Expr being casted is a ParenListExpr, handle it specially.
4698 if (isa<ParenListExpr>(castExpr))
John McCall9ae2f072010-08-23 23:25:46 +00004699 return ActOnCastOfParenListExpr(S, LParenLoc, RParenLoc, castExpr,
John McCall42f56b52010-01-18 19:35:47 +00004700 castTInfo);
John McCallb042fdf2010-01-15 18:56:44 +00004701
John McCall9ae2f072010-08-23 23:25:46 +00004702 return BuildCStyleCastExpr(LParenLoc, castTInfo, RParenLoc, castExpr);
John McCallb042fdf2010-01-15 18:56:44 +00004703}
4704
John McCall60d7b3a2010-08-24 06:29:42 +00004705ExprResult
John McCallb042fdf2010-01-15 18:56:44 +00004706Sema::BuildCStyleCastExpr(SourceLocation LParenLoc, TypeSourceInfo *Ty,
John McCall9ae2f072010-08-23 23:25:46 +00004707 SourceLocation RParenLoc, Expr *castExpr) {
John McCalldaa8e4e2010-11-15 09:13:47 +00004708 CastKind Kind = CK_Invalid;
John McCallf89e55a2010-11-18 06:31:45 +00004709 ExprValueKind VK = VK_RValue;
John McCallf871d0c2010-08-07 06:22:56 +00004710 CXXCastPath BasePath;
John McCallb042fdf2010-01-15 18:56:44 +00004711 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), Ty->getType(), castExpr,
John McCallf89e55a2010-11-18 06:31:45 +00004712 Kind, VK, BasePath))
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00004713 return ExprError();
Anders Carlsson0aebc812009-09-09 21:33:21 +00004714
John McCallf871d0c2010-08-07 06:22:56 +00004715 return Owned(CStyleCastExpr::Create(Context,
Douglas Gregor63982352010-07-13 18:40:04 +00004716 Ty->getType().getNonLValueExprType(Context),
John McCallf89e55a2010-11-18 06:31:45 +00004717 VK, Kind, castExpr, &BasePath, Ty,
John McCallf871d0c2010-08-07 06:22:56 +00004718 LParenLoc, RParenLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00004719}
4720
Nate Begeman2ef13e52009-08-10 23:49:36 +00004721/// This is not an AltiVec-style cast, so turn the ParenListExpr into a sequence
4722/// of comma binary operators.
John McCall60d7b3a2010-08-24 06:29:42 +00004723ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00004724Sema::MaybeConvertParenListExprToParenExpr(Scope *S, Expr *expr) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00004725 ParenListExpr *E = dyn_cast<ParenListExpr>(expr);
4726 if (!E)
4727 return Owned(expr);
Mike Stump1eb44332009-09-09 15:08:12 +00004728
John McCall60d7b3a2010-08-24 06:29:42 +00004729 ExprResult Result(E->getExpr(0));
Mike Stump1eb44332009-09-09 15:08:12 +00004730
Nate Begeman2ef13e52009-08-10 23:49:36 +00004731 for (unsigned i = 1, e = E->getNumExprs(); i != e && !Result.isInvalid(); ++i)
John McCall9ae2f072010-08-23 23:25:46 +00004732 Result = ActOnBinOp(S, E->getExprLoc(), tok::comma, Result.get(),
4733 E->getExpr(i));
Mike Stump1eb44332009-09-09 15:08:12 +00004734
John McCall9ae2f072010-08-23 23:25:46 +00004735 if (Result.isInvalid()) return ExprError();
4736
4737 return ActOnParenExpr(E->getLParenLoc(), E->getRParenLoc(), Result.get());
Nate Begeman2ef13e52009-08-10 23:49:36 +00004738}
4739
John McCall60d7b3a2010-08-24 06:29:42 +00004740ExprResult
Nate Begeman2ef13e52009-08-10 23:49:36 +00004741Sema::ActOnCastOfParenListExpr(Scope *S, SourceLocation LParenLoc,
John McCall9ae2f072010-08-23 23:25:46 +00004742 SourceLocation RParenLoc, Expr *Op,
John McCall42f56b52010-01-18 19:35:47 +00004743 TypeSourceInfo *TInfo) {
John McCall9ae2f072010-08-23 23:25:46 +00004744 ParenListExpr *PE = cast<ParenListExpr>(Op);
John McCall42f56b52010-01-18 19:35:47 +00004745 QualType Ty = TInfo->getType();
John Thompson8bb59a82010-06-30 22:55:51 +00004746 bool isAltiVecLiteral = false;
Mike Stump1eb44332009-09-09 15:08:12 +00004747
John Thompson8bb59a82010-06-30 22:55:51 +00004748 // Check for an altivec literal,
4749 // i.e. all the elements are integer constants.
Nate Begeman2ef13e52009-08-10 23:49:36 +00004750 if (getLangOptions().AltiVec && Ty->isVectorType()) {
4751 if (PE->getNumExprs() == 0) {
4752 Diag(PE->getExprLoc(), diag::err_altivec_empty_initializer);
4753 return ExprError();
4754 }
John Thompson8bb59a82010-06-30 22:55:51 +00004755 if (PE->getNumExprs() == 1) {
4756 if (!PE->getExpr(0)->getType()->isVectorType())
4757 isAltiVecLiteral = true;
4758 }
4759 else
4760 isAltiVecLiteral = true;
4761 }
Nate Begeman2ef13e52009-08-10 23:49:36 +00004762
John Thompson8bb59a82010-06-30 22:55:51 +00004763 // If this is an altivec initializer, '(' type ')' '(' init, ..., init ')'
4764 // then handle it as such.
4765 if (isAltiVecLiteral) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00004766 llvm::SmallVector<Expr *, 8> initExprs;
4767 for (unsigned i = 0, e = PE->getNumExprs(); i != e; ++i)
4768 initExprs.push_back(PE->getExpr(i));
4769
4770 // FIXME: This means that pretty-printing the final AST will produce curly
4771 // braces instead of the original commas.
Ted Kremenek709210f2010-04-13 23:39:13 +00004772 InitListExpr *E = new (Context) InitListExpr(Context, LParenLoc,
4773 &initExprs[0],
Nate Begeman2ef13e52009-08-10 23:49:36 +00004774 initExprs.size(), RParenLoc);
4775 E->setType(Ty);
John McCall9ae2f072010-08-23 23:25:46 +00004776 return BuildCompoundLiteralExpr(LParenLoc, TInfo, RParenLoc, E);
Nate Begeman2ef13e52009-08-10 23:49:36 +00004777 } else {
Mike Stump1eb44332009-09-09 15:08:12 +00004778 // This is not an AltiVec-style cast, so turn the ParenListExpr into a
Nate Begeman2ef13e52009-08-10 23:49:36 +00004779 // sequence of BinOp comma operators.
John McCall60d7b3a2010-08-24 06:29:42 +00004780 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Op);
John McCall9ae2f072010-08-23 23:25:46 +00004781 if (Result.isInvalid()) return ExprError();
4782 return BuildCStyleCastExpr(LParenLoc, TInfo, RParenLoc, Result.take());
Nate Begeman2ef13e52009-08-10 23:49:36 +00004783 }
4784}
4785
John McCall60d7b3a2010-08-24 06:29:42 +00004786ExprResult Sema::ActOnParenOrParenListExpr(SourceLocation L,
Nate Begeman2ef13e52009-08-10 23:49:36 +00004787 SourceLocation R,
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00004788 MultiExprArg Val,
John McCallb3d87482010-08-24 05:47:05 +00004789 ParsedType TypeOfCast) {
Nate Begeman2ef13e52009-08-10 23:49:36 +00004790 unsigned nexprs = Val.size();
4791 Expr **exprs = reinterpret_cast<Expr**>(Val.release());
Fariborz Jahanianf88f7ab2009-11-25 01:26:41 +00004792 assert((exprs != 0) && "ActOnParenOrParenListExpr() missing expr list");
4793 Expr *expr;
4794 if (nexprs == 1 && TypeOfCast && !TypeIsVectorType(TypeOfCast))
4795 expr = new (Context) ParenExpr(L, R, exprs[0]);
4796 else
4797 expr = new (Context) ParenListExpr(Context, L, exprs, nexprs, R);
Nate Begeman2ef13e52009-08-10 23:49:36 +00004798 return Owned(expr);
4799}
4800
Sebastian Redl28507842009-02-26 14:39:58 +00004801/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension.
4802/// In that case, lhs = cond.
Chris Lattnera119a3b2009-02-18 04:38:20 +00004803/// C99 6.5.15
4804QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
John McCallf89e55a2010-11-18 06:31:45 +00004805 Expr *&SAVE, ExprValueKind &VK,
John McCall09431682010-11-18 19:01:18 +00004806 ExprObjectKind &OK,
Chris Lattnera119a3b2009-02-18 04:38:20 +00004807 SourceLocation QuestionLoc) {
Douglas Gregor7ad5d422010-11-09 21:07:58 +00004808 // If both LHS and RHS are overloaded functions, try to resolve them.
4809 if (Context.hasSameType(LHS->getType(), RHS->getType()) &&
4810 LHS->getType()->isSpecificBuiltinType(BuiltinType::Overload)) {
4811 ExprResult LHSResult = CheckPlaceholderExpr(LHS, QuestionLoc);
4812 if (LHSResult.isInvalid())
4813 return QualType();
4814
4815 ExprResult RHSResult = CheckPlaceholderExpr(RHS, QuestionLoc);
4816 if (RHSResult.isInvalid())
4817 return QualType();
4818
4819 LHS = LHSResult.take();
4820 RHS = RHSResult.take();
4821 }
4822
Sebastian Redl3201f6b2009-04-16 17:51:27 +00004823 // C++ is sufficiently different to merit its own checker.
4824 if (getLangOptions().CPlusPlus)
John McCall09431682010-11-18 19:01:18 +00004825 return CXXCheckConditionalOperands(Cond, LHS, RHS, SAVE,
4826 VK, OK, QuestionLoc);
John McCallf89e55a2010-11-18 06:31:45 +00004827
4828 VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00004829 OK = OK_Ordinary;
Sebastian Redl3201f6b2009-04-16 17:51:27 +00004830
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004831 UsualUnaryConversions(Cond);
Fariborz Jahanian1fb019b2010-09-18 19:38:38 +00004832 if (SAVE) {
4833 SAVE = LHS = Cond;
4834 }
4835 else
4836 UsualUnaryConversions(LHS);
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004837 UsualUnaryConversions(RHS);
4838 QualType CondTy = Cond->getType();
4839 QualType LHSTy = LHS->getType();
4840 QualType RHSTy = RHS->getType();
Steve Naroffc80b4ee2007-07-16 21:54:35 +00004841
Reid Spencer5f016e22007-07-11 17:01:13 +00004842 // first, check the condition.
Sebastian Redl3201f6b2009-04-16 17:51:27 +00004843 if (!CondTy->isScalarType()) { // C99 6.5.15p2
Nate Begeman6155d732010-09-20 22:41:17 +00004844 // OpenCL: Sec 6.3.i says the condition is allowed to be a vector or scalar.
4845 // Throw an error if its not either.
4846 if (getLangOptions().OpenCL) {
4847 if (!CondTy->isVectorType()) {
4848 Diag(Cond->getLocStart(),
4849 diag::err_typecheck_cond_expect_scalar_or_vector)
4850 << CondTy;
4851 return QualType();
4852 }
4853 }
4854 else {
4855 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar)
4856 << CondTy;
4857 return QualType();
4858 }
Reid Spencer5f016e22007-07-11 17:01:13 +00004859 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00004860
Chris Lattner70d67a92008-01-06 22:42:25 +00004861 // Now check the two expressions.
Nate Begeman2ef13e52009-08-10 23:49:36 +00004862 if (LHSTy->isVectorType() || RHSTy->isVectorType())
4863 return CheckVectorOperands(QuestionLoc, LHS, RHS);
Douglas Gregor898574e2008-12-05 23:32:09 +00004864
Nate Begeman6155d732010-09-20 22:41:17 +00004865 // OpenCL: If the condition is a vector, and both operands are scalar,
4866 // attempt to implicity convert them to the vector type to act like the
4867 // built in select.
4868 if (getLangOptions().OpenCL && CondTy->isVectorType()) {
4869 // Both operands should be of scalar type.
4870 if (!LHSTy->isScalarType()) {
4871 Diag(LHS->getLocStart(), diag::err_typecheck_cond_expect_scalar)
4872 << CondTy;
4873 return QualType();
4874 }
4875 if (!RHSTy->isScalarType()) {
4876 Diag(RHS->getLocStart(), diag::err_typecheck_cond_expect_scalar)
4877 << CondTy;
4878 return QualType();
4879 }
4880 // Implicity convert these scalars to the type of the condition.
4881 ImpCastExprToType(LHS, CondTy, CK_IntegralCast);
4882 ImpCastExprToType(RHS, CondTy, CK_IntegralCast);
4883 }
4884
Chris Lattner70d67a92008-01-06 22:42:25 +00004885 // If both operands have arithmetic type, do the usual arithmetic conversions
4886 // to find a common type: C99 6.5.15p3,5.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004887 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) {
4888 UsualArithmeticConversions(LHS, RHS);
4889 return LHS->getType();
Steve Naroffa4332e22007-07-17 00:58:39 +00004890 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00004891
Chris Lattner70d67a92008-01-06 22:42:25 +00004892 // If both operands are the same structure or union type, the result is that
4893 // type.
Ted Kremenek6217b802009-07-29 21:53:49 +00004894 if (const RecordType *LHSRT = LHSTy->getAs<RecordType>()) { // C99 6.5.15p3
4895 if (const RecordType *RHSRT = RHSTy->getAs<RecordType>())
Chris Lattnera21ddb32007-11-26 01:40:58 +00004896 if (LHSRT->getDecl() == RHSRT->getDecl())
Mike Stumpeed9cac2009-02-19 03:04:26 +00004897 // "If both the operands have structure or union type, the result has
Chris Lattner70d67a92008-01-06 22:42:25 +00004898 // that type." This implies that CV qualifiers are dropped.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004899 return LHSTy.getUnqualifiedType();
Eli Friedmanb1d796d2009-03-23 00:24:07 +00004900 // FIXME: Type of conditional expression must be complete in C mode.
Reid Spencer5f016e22007-07-11 17:01:13 +00004901 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00004902
Chris Lattner70d67a92008-01-06 22:42:25 +00004903 // C99 6.5.15p5: "If both operands have void type, the result has void type."
Steve Naroffe701c0a2008-05-12 21:44:38 +00004904 // The following || allows only one side to be void (a GCC-ism).
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004905 if (LHSTy->isVoidType() || RHSTy->isVoidType()) {
4906 if (!LHSTy->isVoidType())
4907 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void)
4908 << RHS->getSourceRange();
4909 if (!RHSTy->isVoidType())
4910 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void)
4911 << LHS->getSourceRange();
John McCall2de56d12010-08-25 11:45:40 +00004912 ImpCastExprToType(LHS, Context.VoidTy, CK_ToVoid);
4913 ImpCastExprToType(RHS, Context.VoidTy, CK_ToVoid);
Eli Friedman0e724012008-06-04 19:47:51 +00004914 return Context.VoidTy;
Steve Naroffe701c0a2008-05-12 21:44:38 +00004915 }
Steve Naroffb6d54e52008-01-08 01:11:38 +00004916 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has
4917 // the type of the other operand."
Steve Naroff58f9f2c2009-07-14 18:25:06 +00004918 if ((LHSTy->isAnyPointerType() || LHSTy->isBlockPointerType()) &&
Douglas Gregorce940492009-09-25 04:25:58 +00004919 RHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00004920 // promote the null to a pointer.
John McCalldaa8e4e2010-11-15 09:13:47 +00004921 ImpCastExprToType(RHS, LHSTy, CK_NullToPointer);
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004922 return LHSTy;
Steve Naroffb6d54e52008-01-08 01:11:38 +00004923 }
Steve Naroff58f9f2c2009-07-14 18:25:06 +00004924 if ((RHSTy->isAnyPointerType() || RHSTy->isBlockPointerType()) &&
Douglas Gregorce940492009-09-25 04:25:58 +00004925 LHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00004926 ImpCastExprToType(LHS, RHSTy, CK_NullToPointer);
Chris Lattnerefdc39d2009-02-18 04:28:32 +00004927 return RHSTy;
Steve Naroffb6d54e52008-01-08 01:11:38 +00004928 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004929
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004930 // All objective-c pointer type analysis is done here.
4931 QualType compositeType = FindCompositeObjCPointerType(LHS, RHS,
4932 QuestionLoc);
4933 if (!compositeType.isNull())
4934 return compositeType;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004935
4936
Steve Naroff7154a772009-07-01 14:36:47 +00004937 // Handle block pointer types.
4938 if (LHSTy->isBlockPointerType() || RHSTy->isBlockPointerType()) {
4939 if (!LHSTy->isBlockPointerType() || !RHSTy->isBlockPointerType()) {
4940 if (LHSTy->isVoidPointerType() || RHSTy->isVoidPointerType()) {
4941 QualType destType = Context.getPointerType(Context.VoidTy);
John McCall2de56d12010-08-25 11:45:40 +00004942 ImpCastExprToType(LHS, destType, CK_BitCast);
4943 ImpCastExprToType(RHS, destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00004944 return destType;
4945 }
4946 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004947 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
Steve Naroff7154a772009-07-01 14:36:47 +00004948 return QualType();
Mike Stumpdd3e1662009-05-07 03:14:14 +00004949 }
Steve Naroff7154a772009-07-01 14:36:47 +00004950 // We have 2 block pointer types.
4951 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
4952 // Two identical block pointer types are always compatible.
Mike Stumpdd3e1662009-05-07 03:14:14 +00004953 return LHSTy;
4954 }
Steve Naroff7154a772009-07-01 14:36:47 +00004955 // The block pointer types aren't identical, continue checking.
Ted Kremenek6217b802009-07-29 21:53:49 +00004956 QualType lhptee = LHSTy->getAs<BlockPointerType>()->getPointeeType();
4957 QualType rhptee = RHSTy->getAs<BlockPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004958
Steve Naroff7154a772009-07-01 14:36:47 +00004959 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(),
4960 rhptee.getUnqualifiedType())) {
Mike Stumpdd3e1662009-05-07 03:14:14 +00004961 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers)
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00004962 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
Mike Stumpdd3e1662009-05-07 03:14:14 +00004963 // In this situation, we assume void* type. No especially good
4964 // reason, but this is what gcc does, and we do have to pick
4965 // to get a consistent AST.
4966 QualType incompatTy = Context.getPointerType(Context.VoidTy);
John McCall2de56d12010-08-25 11:45:40 +00004967 ImpCastExprToType(LHS, incompatTy, CK_BitCast);
4968 ImpCastExprToType(RHS, incompatTy, CK_BitCast);
Mike Stumpdd3e1662009-05-07 03:14:14 +00004969 return incompatTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00004970 }
Steve Naroff7154a772009-07-01 14:36:47 +00004971 // The block pointer types are compatible.
John McCall2de56d12010-08-25 11:45:40 +00004972 ImpCastExprToType(LHS, LHSTy, CK_BitCast);
4973 ImpCastExprToType(RHS, LHSTy, CK_BitCast);
Steve Naroff91588042009-04-08 17:05:15 +00004974 return LHSTy;
4975 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00004976
Steve Naroff7154a772009-07-01 14:36:47 +00004977 // Check constraints for C object pointers types (C99 6.5.15p3,6).
4978 if (LHSTy->isPointerType() && RHSTy->isPointerType()) {
4979 // get the "pointed to" types
Ted Kremenek6217b802009-07-29 21:53:49 +00004980 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
4981 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
Steve Naroff7154a772009-07-01 14:36:47 +00004982
4983 // ignore qualifiers on void (C99 6.5.15p3, clause 6)
4984 if (lhptee->isVoidType() && rhptee->isIncompleteOrObjectType()) {
4985 // Figure out necessary qualifiers (C99 6.5.15p6)
John McCall0953e762009-09-24 19:53:00 +00004986 QualType destPointee
4987 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
Steve Naroff7154a772009-07-01 14:36:47 +00004988 QualType destType = Context.getPointerType(destPointee);
Eli Friedman73c39ab2009-10-20 08:27:19 +00004989 // Add qualifiers if necessary.
John McCall2de56d12010-08-25 11:45:40 +00004990 ImpCastExprToType(LHS, destType, CK_NoOp);
Eli Friedman73c39ab2009-10-20 08:27:19 +00004991 // Promote to void*.
John McCall2de56d12010-08-25 11:45:40 +00004992 ImpCastExprToType(RHS, destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00004993 return destType;
4994 }
4995 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) {
John McCall0953e762009-09-24 19:53:00 +00004996 QualType destPointee
4997 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
Steve Naroff7154a772009-07-01 14:36:47 +00004998 QualType destType = Context.getPointerType(destPointee);
Eli Friedman73c39ab2009-10-20 08:27:19 +00004999 // Add qualifiers if necessary.
John McCall2de56d12010-08-25 11:45:40 +00005000 ImpCastExprToType(RHS, destType, CK_NoOp);
Eli Friedman73c39ab2009-10-20 08:27:19 +00005001 // Promote to void*.
John McCall2de56d12010-08-25 11:45:40 +00005002 ImpCastExprToType(LHS, destType, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00005003 return destType;
5004 }
5005
5006 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
5007 // Two identical pointer types are always compatible.
5008 return LHSTy;
5009 }
5010 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(),
5011 rhptee.getUnqualifiedType())) {
5012 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers)
5013 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
5014 // In this situation, we assume void* type. No especially good
5015 // reason, but this is what gcc does, and we do have to pick
5016 // to get a consistent AST.
5017 QualType incompatTy = Context.getPointerType(Context.VoidTy);
John McCall2de56d12010-08-25 11:45:40 +00005018 ImpCastExprToType(LHS, incompatTy, CK_BitCast);
5019 ImpCastExprToType(RHS, incompatTy, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00005020 return incompatTy;
5021 }
5022 // The pointer types are compatible.
5023 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to
5024 // differently qualified versions of compatible types, the result type is
5025 // a pointer to an appropriately qualified version of the *composite*
5026 // type.
5027 // FIXME: Need to calculate the composite type.
5028 // FIXME: Need to add qualifiers
John McCall2de56d12010-08-25 11:45:40 +00005029 ImpCastExprToType(LHS, LHSTy, CK_BitCast);
5030 ImpCastExprToType(RHS, LHSTy, CK_BitCast);
Steve Naroff7154a772009-07-01 14:36:47 +00005031 return LHSTy;
5032 }
Mike Stump1eb44332009-09-09 15:08:12 +00005033
John McCall404cd162010-11-13 01:35:44 +00005034 // GCC compatibility: soften pointer/integer mismatch. Note that
5035 // null pointers have been filtered out by this point.
Steve Naroff7154a772009-07-01 14:36:47 +00005036 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) {
5037 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch)
5038 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
John McCall2de56d12010-08-25 11:45:40 +00005039 ImpCastExprToType(LHS, RHSTy, CK_IntegralToPointer);
Steve Naroff7154a772009-07-01 14:36:47 +00005040 return RHSTy;
5041 }
5042 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) {
5043 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch)
5044 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
John McCall2de56d12010-08-25 11:45:40 +00005045 ImpCastExprToType(RHS, LHSTy, CK_IntegralToPointer);
Steve Naroff7154a772009-07-01 14:36:47 +00005046 return LHSTy;
5047 }
Daniel Dunbar5e155f02008-09-11 23:12:46 +00005048
Chris Lattner70d67a92008-01-06 22:42:25 +00005049 // Otherwise, the operands are not compatible.
Chris Lattnerefdc39d2009-02-18 04:28:32 +00005050 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
5051 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00005052 return QualType();
5053}
5054
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005055/// FindCompositeObjCPointerType - Helper method to find composite type of
5056/// two objective-c pointer types of the two input expressions.
5057QualType Sema::FindCompositeObjCPointerType(Expr *&LHS, Expr *&RHS,
5058 SourceLocation QuestionLoc) {
5059 QualType LHSTy = LHS->getType();
5060 QualType RHSTy = RHS->getType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005061
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005062 // Handle things like Class and struct objc_class*. Here we case the result
5063 // to the pseudo-builtin, because that will be implicitly cast back to the
5064 // redefinition type if an attempt is made to access its fields.
5065 if (LHSTy->isObjCClassType() &&
5066 (RHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) {
John McCall2de56d12010-08-25 11:45:40 +00005067 ImpCastExprToType(RHS, LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005068 return LHSTy;
5069 }
5070 if (RHSTy->isObjCClassType() &&
5071 (LHSTy.getDesugaredType() == Context.ObjCClassRedefinitionType)) {
John McCall2de56d12010-08-25 11:45:40 +00005072 ImpCastExprToType(LHS, RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005073 return RHSTy;
5074 }
5075 // And the same for struct objc_object* / id
5076 if (LHSTy->isObjCIdType() &&
5077 (RHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) {
John McCall2de56d12010-08-25 11:45:40 +00005078 ImpCastExprToType(RHS, LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005079 return LHSTy;
5080 }
5081 if (RHSTy->isObjCIdType() &&
5082 (LHSTy.getDesugaredType() == Context.ObjCIdRedefinitionType)) {
John McCall2de56d12010-08-25 11:45:40 +00005083 ImpCastExprToType(LHS, RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005084 return RHSTy;
5085 }
5086 // And the same for struct objc_selector* / SEL
5087 if (Context.isObjCSelType(LHSTy) &&
5088 (RHSTy.getDesugaredType() == Context.ObjCSelRedefinitionType)) {
John McCall2de56d12010-08-25 11:45:40 +00005089 ImpCastExprToType(RHS, LHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005090 return LHSTy;
5091 }
5092 if (Context.isObjCSelType(RHSTy) &&
5093 (LHSTy.getDesugaredType() == Context.ObjCSelRedefinitionType)) {
John McCall2de56d12010-08-25 11:45:40 +00005094 ImpCastExprToType(LHS, RHSTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005095 return RHSTy;
5096 }
5097 // Check constraints for Objective-C object pointers types.
5098 if (LHSTy->isObjCObjectPointerType() && RHSTy->isObjCObjectPointerType()) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005099
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005100 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) {
5101 // Two identical object pointer types are always compatible.
5102 return LHSTy;
5103 }
5104 const ObjCObjectPointerType *LHSOPT = LHSTy->getAs<ObjCObjectPointerType>();
5105 const ObjCObjectPointerType *RHSOPT = RHSTy->getAs<ObjCObjectPointerType>();
5106 QualType compositeType = LHSTy;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005107
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005108 // If both operands are interfaces and either operand can be
5109 // assigned to the other, use that type as the composite
5110 // type. This allows
5111 // xxx ? (A*) a : (B*) b
5112 // where B is a subclass of A.
5113 //
5114 // Additionally, as for assignment, if either type is 'id'
5115 // allow silent coercion. Finally, if the types are
5116 // incompatible then make sure to use 'id' as the composite
5117 // type so the result is acceptable for sending messages to.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005118
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005119 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'.
5120 // It could return the composite type.
5121 if (Context.canAssignObjCInterfaces(LHSOPT, RHSOPT)) {
5122 compositeType = RHSOPT->isObjCBuiltinType() ? RHSTy : LHSTy;
5123 } else if (Context.canAssignObjCInterfaces(RHSOPT, LHSOPT)) {
5124 compositeType = LHSOPT->isObjCBuiltinType() ? LHSTy : RHSTy;
5125 } else if ((LHSTy->isObjCQualifiedIdType() ||
5126 RHSTy->isObjCQualifiedIdType()) &&
5127 Context.ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true)) {
5128 // Need to handle "id<xx>" explicitly.
5129 // GCC allows qualified id and any Objective-C type to devolve to
5130 // id. Currently localizing to here until clear this should be
5131 // part of ObjCQualifiedIdTypesAreCompatible.
5132 compositeType = Context.getObjCIdType();
5133 } else if (LHSTy->isObjCIdType() || RHSTy->isObjCIdType()) {
5134 compositeType = Context.getObjCIdType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005135 } else if (!(compositeType =
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005136 Context.areCommonBaseCompatible(LHSOPT, RHSOPT)).isNull())
5137 ;
5138 else {
5139 Diag(QuestionLoc, diag::ext_typecheck_cond_incompatible_operands)
5140 << LHSTy << RHSTy
5141 << LHS->getSourceRange() << RHS->getSourceRange();
5142 QualType incompatTy = Context.getObjCIdType();
John McCall2de56d12010-08-25 11:45:40 +00005143 ImpCastExprToType(LHS, incompatTy, CK_BitCast);
5144 ImpCastExprToType(RHS, incompatTy, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005145 return incompatTy;
5146 }
5147 // The object pointer types are compatible.
John McCall2de56d12010-08-25 11:45:40 +00005148 ImpCastExprToType(LHS, compositeType, CK_BitCast);
5149 ImpCastExprToType(RHS, compositeType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005150 return compositeType;
5151 }
5152 // Check Objective-C object pointer types and 'void *'
5153 if (LHSTy->isVoidPointerType() && RHSTy->isObjCObjectPointerType()) {
5154 QualType lhptee = LHSTy->getAs<PointerType>()->getPointeeType();
5155 QualType rhptee = RHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
5156 QualType destPointee
5157 = Context.getQualifiedType(lhptee, rhptee.getQualifiers());
5158 QualType destType = Context.getPointerType(destPointee);
5159 // Add qualifiers if necessary.
John McCall2de56d12010-08-25 11:45:40 +00005160 ImpCastExprToType(LHS, destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005161 // Promote to void*.
John McCall2de56d12010-08-25 11:45:40 +00005162 ImpCastExprToType(RHS, destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005163 return destType;
5164 }
5165 if (LHSTy->isObjCObjectPointerType() && RHSTy->isVoidPointerType()) {
5166 QualType lhptee = LHSTy->getAs<ObjCObjectPointerType>()->getPointeeType();
5167 QualType rhptee = RHSTy->getAs<PointerType>()->getPointeeType();
5168 QualType destPointee
5169 = Context.getQualifiedType(rhptee, lhptee.getQualifiers());
5170 QualType destType = Context.getPointerType(destPointee);
5171 // Add qualifiers if necessary.
John McCall2de56d12010-08-25 11:45:40 +00005172 ImpCastExprToType(RHS, destType, CK_NoOp);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005173 // Promote to void*.
John McCall2de56d12010-08-25 11:45:40 +00005174 ImpCastExprToType(LHS, destType, CK_BitCast);
Fariborz Jahanianeebc4752009-12-10 19:47:41 +00005175 return destType;
5176 }
5177 return QualType();
5178}
5179
Steve Narofff69936d2007-09-16 03:34:24 +00005180/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null
Reid Spencer5f016e22007-07-11 17:01:13 +00005181/// in the case of a the GNU conditional expr extension.
John McCall60d7b3a2010-08-24 06:29:42 +00005182ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc,
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005183 SourceLocation ColonLoc,
John McCall9ae2f072010-08-23 23:25:46 +00005184 Expr *CondExpr, Expr *LHSExpr,
5185 Expr *RHSExpr) {
Chris Lattnera21ddb32007-11-26 01:40:58 +00005186 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS
5187 // was the condition.
5188 bool isLHSNull = LHSExpr == 0;
Fariborz Jahanianf9b949f2010-08-31 18:02:20 +00005189 Expr *SAVEExpr = 0;
5190 if (isLHSNull) {
5191 LHSExpr = SAVEExpr = CondExpr;
5192 }
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005193
John McCallf89e55a2010-11-18 06:31:45 +00005194 ExprValueKind VK = VK_RValue;
John McCall09431682010-11-18 19:01:18 +00005195 ExprObjectKind OK = OK_Ordinary;
Fariborz Jahanian1fb019b2010-09-18 19:38:38 +00005196 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, RHSExpr,
John McCall09431682010-11-18 19:01:18 +00005197 SAVEExpr, VK, OK, QuestionLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00005198 if (result.isNull())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00005199 return ExprError();
5200
Douglas Gregor47e1f7c2009-08-26 14:37:04 +00005201 return Owned(new (Context) ConditionalOperator(CondExpr, QuestionLoc,
Fariborz Jahanianf9b949f2010-08-31 18:02:20 +00005202 LHSExpr, ColonLoc,
5203 RHSExpr, SAVEExpr,
John McCall09431682010-11-18 19:01:18 +00005204 result, VK, OK));
Reid Spencer5f016e22007-07-11 17:01:13 +00005205}
5206
Reid Spencer5f016e22007-07-11 17:01:13 +00005207// CheckPointerTypesForAssignment - This is a very tricky routine (despite
Mike Stumpeed9cac2009-02-19 03:04:26 +00005208// being closely modeled after the C99 spec:-). The odd characteristic of this
Reid Spencer5f016e22007-07-11 17:01:13 +00005209// routine is it effectively iqnores the qualifiers on the top level pointee.
5210// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3].
5211// FIXME: add a couple examples in this comment.
Mike Stumpeed9cac2009-02-19 03:04:26 +00005212Sema::AssignConvertType
Reid Spencer5f016e22007-07-11 17:01:13 +00005213Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) {
5214 QualType lhptee, rhptee;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005215
David Chisnall0f436562009-08-17 16:35:33 +00005216 if ((lhsType->isObjCClassType() &&
5217 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) ||
5218 (rhsType->isObjCClassType() &&
5219 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) {
5220 return Compatible;
5221 }
5222
Reid Spencer5f016e22007-07-11 17:01:13 +00005223 // get the "pointed to" type (ignoring qualifiers at the top level)
Ted Kremenek6217b802009-07-29 21:53:49 +00005224 lhptee = lhsType->getAs<PointerType>()->getPointeeType();
5225 rhptee = rhsType->getAs<PointerType>()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005226
Reid Spencer5f016e22007-07-11 17:01:13 +00005227 // make sure we operate on the canonical type
Chris Lattnerb77792e2008-07-26 22:17:49 +00005228 lhptee = Context.getCanonicalType(lhptee);
5229 rhptee = Context.getCanonicalType(rhptee);
Reid Spencer5f016e22007-07-11 17:01:13 +00005230
Chris Lattner5cf216b2008-01-04 18:04:52 +00005231 AssignConvertType ConvTy = Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005232
5233 // C99 6.5.16.1p1: This following citation is common to constraints
5234 // 3 & 4 (below). ...and the type *pointed to* by the left has all the
5235 // qualifiers of the type *pointed to* by the right;
Fariborz Jahanianf11284a2009-02-17 18:27:45 +00005236 // FIXME: Handle ExtQualType
Douglas Gregor98cd5992008-10-21 23:43:52 +00005237 if (!lhptee.isAtLeastAsQualifiedAs(rhptee))
Chris Lattner5cf216b2008-01-04 18:04:52 +00005238 ConvTy = CompatiblePointerDiscardsQualifiers;
Reid Spencer5f016e22007-07-11 17:01:13 +00005239
Mike Stumpeed9cac2009-02-19 03:04:26 +00005240 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or
5241 // incomplete type and the other is a pointer to a qualified or unqualified
Reid Spencer5f016e22007-07-11 17:01:13 +00005242 // version of void...
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005243 if (lhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00005244 if (rhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00005245 return ConvTy;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005246
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005247 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00005248 assert(rhptee->isFunctionType());
5249 return FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005250 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005251
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005252 if (rhptee->isVoidType()) {
Chris Lattnerd805bec2008-04-02 06:59:01 +00005253 if (lhptee->isIncompleteOrObjectType())
Chris Lattner5cf216b2008-01-04 18:04:52 +00005254 return ConvTy;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005255
5256 // As an extension, we allow cast to/from void* to function pointer.
Chris Lattnerd805bec2008-04-02 06:59:01 +00005257 assert(lhptee->isFunctionType());
5258 return FunctionVoidPointer;
Chris Lattnerbfe639e2008-01-03 22:56:36 +00005259 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005260 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or
Reid Spencer5f016e22007-07-11 17:01:13 +00005261 // unqualified versions of compatible types, ...
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005262 lhptee = lhptee.getUnqualifiedType();
5263 rhptee = rhptee.getUnqualifiedType();
5264 if (!Context.typesAreCompatible(lhptee, rhptee)) {
5265 // Check if the pointee types are compatible ignoring the sign.
5266 // We explicitly check for char so that we catch "char" vs
5267 // "unsigned char" on systems where "char" is unsigned.
Chris Lattner6a2b9262009-10-17 20:33:28 +00005268 if (lhptee->isCharType())
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005269 lhptee = Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00005270 else if (lhptee->hasSignedIntegerRepresentation())
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005271 lhptee = Context.getCorrespondingUnsignedType(lhptee);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005272
Chris Lattner6a2b9262009-10-17 20:33:28 +00005273 if (rhptee->isCharType())
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005274 rhptee = Context.UnsignedCharTy;
Douglas Gregorf6094622010-07-23 15:58:24 +00005275 else if (rhptee->hasSignedIntegerRepresentation())
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005276 rhptee = Context.getCorrespondingUnsignedType(rhptee);
Chris Lattner6a2b9262009-10-17 20:33:28 +00005277
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005278 if (lhptee == rhptee) {
5279 // Types are compatible ignoring the sign. Qualifier incompatibility
5280 // takes priority over sign incompatibility because the sign
5281 // warning can be disabled.
5282 if (ConvTy != Compatible)
5283 return ConvTy;
5284 return IncompatiblePointerSign;
5285 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005286
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005287 // If we are a multi-level pointer, it's possible that our issue is simply
5288 // one of qualification - e.g. char ** -> const char ** is not allowed. If
5289 // the eventual target type is the same and the pointers have the same
5290 // level of indirection, this must be the issue.
5291 if (lhptee->isPointerType() && rhptee->isPointerType()) {
5292 do {
5293 lhptee = lhptee->getAs<PointerType>()->getPointeeType();
5294 rhptee = rhptee->getAs<PointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005295
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005296 lhptee = Context.getCanonicalType(lhptee);
5297 rhptee = Context.getCanonicalType(rhptee);
5298 } while (lhptee->isPointerType() && rhptee->isPointerType());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005299
Douglas Gregora4923eb2009-11-16 21:35:15 +00005300 if (Context.hasSameUnqualifiedType(lhptee, rhptee))
Sean Huntc9132b62009-11-08 07:46:34 +00005301 return IncompatibleNestedPointerQualifiers;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00005302 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005303
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005304 // General pointer incompatibility takes priority over qualifiers.
Mike Stump1eb44332009-09-09 15:08:12 +00005305 return IncompatiblePointer;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00005306 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00005307 return ConvTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00005308}
5309
Steve Naroff1c7d0672008-09-04 15:10:53 +00005310/// CheckBlockPointerTypesForAssignment - This routine determines whether two
5311/// block pointer types are compatible or whether a block and normal pointer
5312/// are compatible. It is more restrict than comparing two function pointer
5313// types.
Mike Stumpeed9cac2009-02-19 03:04:26 +00005314Sema::AssignConvertType
5315Sema::CheckBlockPointerTypesForAssignment(QualType lhsType,
Steve Naroff1c7d0672008-09-04 15:10:53 +00005316 QualType rhsType) {
5317 QualType lhptee, rhptee;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005318
Steve Naroff1c7d0672008-09-04 15:10:53 +00005319 // get the "pointed to" type (ignoring qualifiers at the top level)
Ted Kremenek6217b802009-07-29 21:53:49 +00005320 lhptee = lhsType->getAs<BlockPointerType>()->getPointeeType();
5321 rhptee = rhsType->getAs<BlockPointerType>()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005322
Steve Naroff1c7d0672008-09-04 15:10:53 +00005323 // make sure we operate on the canonical type
5324 lhptee = Context.getCanonicalType(lhptee);
5325 rhptee = Context.getCanonicalType(rhptee);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005326
Steve Naroff1c7d0672008-09-04 15:10:53 +00005327 AssignConvertType ConvTy = Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005328
Steve Naroff1c7d0672008-09-04 15:10:53 +00005329 // For blocks we enforce that qualifiers are identical.
Douglas Gregora4923eb2009-11-16 21:35:15 +00005330 if (lhptee.getLocalCVRQualifiers() != rhptee.getLocalCVRQualifiers())
Steve Naroff1c7d0672008-09-04 15:10:53 +00005331 ConvTy = CompatiblePointerDiscardsQualifiers;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005332
Fariborz Jahanian132f2a22010-03-17 00:20:01 +00005333 if (!getLangOptions().CPlusPlus) {
5334 if (!Context.typesAreBlockPointerCompatible(lhsType, rhsType))
5335 return IncompatibleBlockPointer;
5336 }
5337 else if (!Context.typesAreCompatible(lhptee, rhptee))
Mike Stumpeed9cac2009-02-19 03:04:26 +00005338 return IncompatibleBlockPointer;
Steve Naroff1c7d0672008-09-04 15:10:53 +00005339 return ConvTy;
5340}
5341
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005342/// CheckObjCPointerTypesForAssignment - Compares two objective-c pointer types
5343/// for assignment compatibility.
5344Sema::AssignConvertType
5345Sema::CheckObjCPointerTypesForAssignment(QualType lhsType, QualType rhsType) {
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005346 if (lhsType->isObjCBuiltinType()) {
5347 // Class is not compatible with ObjC object pointers.
Fariborz Jahanian528adb12010-03-24 21:00:27 +00005348 if (lhsType->isObjCClassType() && !rhsType->isObjCBuiltinType() &&
5349 !rhsType->isObjCQualifiedClassType())
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005350 return IncompatiblePointer;
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005351 return Compatible;
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005352 }
5353 if (rhsType->isObjCBuiltinType()) {
5354 // Class is not compatible with ObjC object pointers.
Fariborz Jahanian528adb12010-03-24 21:00:27 +00005355 if (rhsType->isObjCClassType() && !lhsType->isObjCBuiltinType() &&
5356 !lhsType->isObjCQualifiedClassType())
Fariborz Jahaniand4c60902010-03-19 18:06:10 +00005357 return IncompatiblePointer;
5358 return Compatible;
5359 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005360 QualType lhptee =
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005361 lhsType->getAs<ObjCObjectPointerType>()->getPointeeType();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005362 QualType rhptee =
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005363 rhsType->getAs<ObjCObjectPointerType>()->getPointeeType();
5364 // make sure we operate on the canonical type
5365 lhptee = Context.getCanonicalType(lhptee);
5366 rhptee = Context.getCanonicalType(rhptee);
5367 if (!lhptee.isAtLeastAsQualifiedAs(rhptee))
5368 return CompatiblePointerDiscardsQualifiers;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005369
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005370 if (Context.typesAreCompatible(lhsType, rhsType))
5371 return Compatible;
5372 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType())
5373 return IncompatibleObjCQualifiedId;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005374 return IncompatiblePointer;
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005375}
5376
John McCall1c23e912010-11-16 02:32:08 +00005377Sema::AssignConvertType
5378Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) {
5379 // Fake up an opaque expression. We don't actually care about what
5380 // cast operations are required, so if CheckAssignmentConstraints
5381 // adds casts to this they'll be wasted, but fortunately that doesn't
5382 // usually happen on valid code.
5383 OpaqueValueExpr rhs(rhsType, VK_RValue);
5384 Expr *rhsPtr = &rhs;
5385 CastKind K = CK_Invalid;
5386
5387 return CheckAssignmentConstraints(lhsType, rhsPtr, K);
5388}
5389
Mike Stumpeed9cac2009-02-19 03:04:26 +00005390/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently
5391/// has code to accommodate several GCC extensions when type checking
Reid Spencer5f016e22007-07-11 17:01:13 +00005392/// pointers. Here are some objectionable examples that GCC considers warnings:
5393///
5394/// int a, *pint;
5395/// short *pshort;
5396/// struct foo *pfoo;
5397///
5398/// pint = pshort; // warning: assignment from incompatible pointer type
5399/// a = pint; // warning: assignment makes integer from pointer without a cast
5400/// pint = a; // warning: assignment makes pointer from integer without a cast
5401/// pint = pfoo; // warning: assignment from incompatible pointer type
5402///
5403/// As a result, the code for dealing with pointers is more complex than the
Mike Stumpeed9cac2009-02-19 03:04:26 +00005404/// C99 spec dictates.
Reid Spencer5f016e22007-07-11 17:01:13 +00005405///
John McCalldaa8e4e2010-11-15 09:13:47 +00005406/// Sets 'Kind' for any result kind except Incompatible.
Chris Lattner5cf216b2008-01-04 18:04:52 +00005407Sema::AssignConvertType
John McCall1c23e912010-11-16 02:32:08 +00005408Sema::CheckAssignmentConstraints(QualType lhsType, Expr *&rhs,
John McCalldaa8e4e2010-11-15 09:13:47 +00005409 CastKind &Kind) {
John McCall1c23e912010-11-16 02:32:08 +00005410 QualType rhsType = rhs->getType();
5411
Chris Lattnerfc144e22008-01-04 23:18:45 +00005412 // Get canonical types. We're not formatting these types, just comparing
5413 // them.
Chris Lattnerb77792e2008-07-26 22:17:49 +00005414 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType();
5415 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType();
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005416
John McCalldaa8e4e2010-11-15 09:13:47 +00005417 if (lhsType == rhsType) {
5418 Kind = CK_NoOp;
Chris Lattnerd2656dd2008-01-07 17:51:46 +00005419 return Compatible; // Common case: fast path an exact match.
John McCalldaa8e4e2010-11-15 09:13:47 +00005420 }
Steve Naroff700204c2007-07-24 21:46:40 +00005421
David Chisnall0f436562009-08-17 16:35:33 +00005422 if ((lhsType->isObjCClassType() &&
5423 (rhsType.getDesugaredType() == Context.ObjCClassRedefinitionType)) ||
5424 (rhsType->isObjCClassType() &&
5425 (lhsType.getDesugaredType() == Context.ObjCClassRedefinitionType))) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005426 Kind = CK_BitCast;
5427 return Compatible;
David Chisnall0f436562009-08-17 16:35:33 +00005428 }
5429
Douglas Gregor9d293df2008-10-28 00:22:11 +00005430 // If the left-hand side is a reference type, then we are in a
5431 // (rare!) case where we've allowed the use of references in C,
5432 // e.g., as a parameter type in a built-in function. In this case,
5433 // just make sure that the type referenced is compatible with the
5434 // right-hand side type. The caller is responsible for adjusting
5435 // lhsType so that the resulting expression does not have reference
5436 // type.
Ted Kremenek6217b802009-07-29 21:53:49 +00005437 if (const ReferenceType *lhsTypeRef = lhsType->getAs<ReferenceType>()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005438 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) {
5439 Kind = CK_LValueBitCast;
Anders Carlsson793680e2007-10-12 23:56:29 +00005440 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005441 }
Chris Lattnerfc144e22008-01-04 23:18:45 +00005442 return Incompatible;
Fariborz Jahanian411f3732007-12-19 17:45:58 +00005443 }
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005444 // Allow scalar to ExtVector assignments, and assignments of an ExtVector type
5445 // to the same ExtVector type.
5446 if (lhsType->isExtVectorType()) {
5447 if (rhsType->isExtVectorType())
John McCalldaa8e4e2010-11-15 09:13:47 +00005448 return Incompatible;
5449 if (rhsType->isArithmeticType()) {
John McCall1c23e912010-11-16 02:32:08 +00005450 // CK_VectorSplat does T -> vector T, so first cast to the
5451 // element type.
5452 QualType elType = cast<ExtVectorType>(lhsType)->getElementType();
5453 if (elType != rhsType) {
5454 Kind = PrepareScalarCast(*this, rhs, elType);
5455 ImpCastExprToType(rhs, elType, Kind);
5456 }
5457 Kind = CK_VectorSplat;
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005458 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005459 }
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005460 }
Mike Stump1eb44332009-09-09 15:08:12 +00005461
Nate Begemanbe2341d2008-07-14 18:02:46 +00005462 if (lhsType->isVectorType() || rhsType->isVectorType()) {
Douglas Gregor255210e2010-08-06 10:14:59 +00005463 if (lhsType->isVectorType() && rhsType->isVectorType()) {
5464 // If we are allowing lax vector conversions, and LHS and RHS are both
5465 // vectors, the total size only needs to be the same. This is a bitcast;
5466 // no bits are changed but the result type is different.
5467 if (getLangOptions().LaxVectorConversions &&
John McCalldaa8e4e2010-11-15 09:13:47 +00005468 (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType))) {
John McCall0c6d28d2010-11-15 10:08:00 +00005469 Kind = CK_BitCast;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00005470 return IncompatibleVectors;
John McCalldaa8e4e2010-11-15 09:13:47 +00005471 }
Douglas Gregor255210e2010-08-06 10:14:59 +00005472
5473 // Allow assignments of an AltiVec vector type to an equivalent GCC
5474 // vector type and vice versa
John McCalldaa8e4e2010-11-15 09:13:47 +00005475 if (Context.areCompatibleVectorTypes(lhsType, rhsType)) {
John McCall0c6d28d2010-11-15 10:08:00 +00005476 Kind = CK_BitCast;
Douglas Gregor255210e2010-08-06 10:14:59 +00005477 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005478 }
Chris Lattnere8b3e962008-01-04 23:32:24 +00005479 }
5480 return Incompatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005481 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005482
Douglas Gregor88623ad2010-05-23 21:53:47 +00005483 if (lhsType->isArithmeticType() && rhsType->isArithmeticType() &&
John McCalldaa8e4e2010-11-15 09:13:47 +00005484 !(getLangOptions().CPlusPlus && lhsType->isEnumeralType())) {
John McCall1c23e912010-11-16 02:32:08 +00005485 Kind = PrepareScalarCast(*this, rhs, lhsType);
Reid Spencer5f016e22007-07-11 17:01:13 +00005486 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005487 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005488
Chris Lattner78eca282008-04-07 06:49:41 +00005489 if (isa<PointerType>(lhsType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005490 if (rhsType->isIntegerType()) {
5491 Kind = CK_IntegralToPointer; // FIXME: null?
Chris Lattnerb7b61152008-01-04 18:22:42 +00005492 return IntToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00005493 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005494
John McCalldaa8e4e2010-11-15 09:13:47 +00005495 if (isa<PointerType>(rhsType)) {
5496 Kind = CK_BitCast;
Reid Spencer5f016e22007-07-11 17:01:13 +00005497 return CheckPointerTypesForAssignment(lhsType, rhsType);
John McCalldaa8e4e2010-11-15 09:13:47 +00005498 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005499
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005500 // In general, C pointers are not compatible with ObjC object pointers.
Steve Naroff14108da2009-07-10 23:34:53 +00005501 if (isa<ObjCObjectPointerType>(rhsType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005502 Kind = CK_AnyPointerToObjCPointerCast;
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005503 if (lhsType->isVoidPointerType()) // an exception to the rule.
5504 return Compatible;
5505 return IncompatiblePointer;
Steve Naroff14108da2009-07-10 23:34:53 +00005506 }
Ted Kremenek6217b802009-07-29 21:53:49 +00005507 if (rhsType->getAs<BlockPointerType>()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005508 if (lhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) {
5509 Kind = CK_BitCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00005510 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005511 }
Steve Naroffb4406862008-09-29 18:10:17 +00005512
5513 // Treat block pointers as objects.
John McCalldaa8e4e2010-11-15 09:13:47 +00005514 if (getLangOptions().ObjC1 && lhsType->isObjCIdType()) {
5515 Kind = CK_AnyPointerToObjCPointerCast;
Steve Naroffb4406862008-09-29 18:10:17 +00005516 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005517 }
Steve Naroffb4406862008-09-29 18:10:17 +00005518 }
Steve Naroff1c7d0672008-09-04 15:10:53 +00005519 return Incompatible;
5520 }
5521
5522 if (isa<BlockPointerType>(lhsType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005523 if (rhsType->isIntegerType()) {
5524 Kind = CK_IntegralToPointer; // FIXME: null
Eli Friedmand8f4f432009-02-25 04:20:42 +00005525 return IntToBlockPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00005526 }
5527
5528 Kind = CK_AnyPointerToObjCPointerCast;
Mike Stumpeed9cac2009-02-19 03:04:26 +00005529
Steve Naroffb4406862008-09-29 18:10:17 +00005530 // Treat block pointers as objects.
Steve Naroff14108da2009-07-10 23:34:53 +00005531 if (getLangOptions().ObjC1 && rhsType->isObjCIdType())
Steve Naroffb4406862008-09-29 18:10:17 +00005532 return Compatible;
5533
Steve Naroff1c7d0672008-09-04 15:10:53 +00005534 if (rhsType->isBlockPointerType())
5535 return CheckBlockPointerTypesForAssignment(lhsType, rhsType);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005536
John McCalldaa8e4e2010-11-15 09:13:47 +00005537 if (const PointerType *RHSPT = rhsType->getAs<PointerType>())
Steve Naroff1c7d0672008-09-04 15:10:53 +00005538 if (RHSPT->getPointeeType()->isVoidType())
Douglas Gregor63a94902008-11-27 00:44:28 +00005539 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005540
Chris Lattnerfc144e22008-01-04 23:18:45 +00005541 return Incompatible;
5542 }
5543
Steve Naroff14108da2009-07-10 23:34:53 +00005544 if (isa<ObjCObjectPointerType>(lhsType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005545 if (rhsType->isIntegerType()) {
5546 Kind = CK_IntegralToPointer; // FIXME: null
Steve Naroff14108da2009-07-10 23:34:53 +00005547 return IntToPointer;
John McCalldaa8e4e2010-11-15 09:13:47 +00005548 }
5549
5550 Kind = CK_BitCast;
Mike Stump1eb44332009-09-09 15:08:12 +00005551
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005552 // In general, C pointers are not compatible with ObjC object pointers.
Steve Naroff14108da2009-07-10 23:34:53 +00005553 if (isa<PointerType>(rhsType)) {
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005554 if (rhsType->isVoidPointerType()) // an exception to the rule.
5555 return Compatible;
5556 return IncompatiblePointer;
Steve Naroff14108da2009-07-10 23:34:53 +00005557 }
5558 if (rhsType->isObjCObjectPointerType()) {
Fariborz Jahanian52efc3f2009-12-08 18:24:49 +00005559 return CheckObjCPointerTypesForAssignment(lhsType, rhsType);
Steve Naroff14108da2009-07-10 23:34:53 +00005560 }
Ted Kremenek6217b802009-07-29 21:53:49 +00005561 if (const PointerType *RHSPT = rhsType->getAs<PointerType>()) {
Steve Naroff14108da2009-07-10 23:34:53 +00005562 if (RHSPT->getPointeeType()->isVoidType())
5563 return Compatible;
5564 }
5565 // Treat block pointers as objects.
5566 if (rhsType->isBlockPointerType())
5567 return Compatible;
5568 return Incompatible;
5569 }
Chris Lattner78eca282008-04-07 06:49:41 +00005570 if (isa<PointerType>(rhsType)) {
Reid Spencer5f016e22007-07-11 17:01:13 +00005571 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer.
John McCalldaa8e4e2010-11-15 09:13:47 +00005572 if (lhsType == Context.BoolTy) {
5573 Kind = CK_PointerToBoolean;
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005574 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005575 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005576
John McCalldaa8e4e2010-11-15 09:13:47 +00005577 if (lhsType->isIntegerType()) {
5578 Kind = CK_PointerToIntegral;
Chris Lattnerb7b61152008-01-04 18:22:42 +00005579 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00005580 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005581
5582 if (isa<BlockPointerType>(lhsType) &&
John McCalldaa8e4e2010-11-15 09:13:47 +00005583 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) {
5584 Kind = CK_AnyPointerToBlockPointerCast;
Douglas Gregor63a94902008-11-27 00:44:28 +00005585 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005586 }
Chris Lattnerfc144e22008-01-04 23:18:45 +00005587 return Incompatible;
Chris Lattnerfc144e22008-01-04 23:18:45 +00005588 }
Steve Naroff14108da2009-07-10 23:34:53 +00005589 if (isa<ObjCObjectPointerType>(rhsType)) {
5590 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer.
John McCalldaa8e4e2010-11-15 09:13:47 +00005591 if (lhsType == Context.BoolTy) {
5592 Kind = CK_PointerToBoolean;
Steve Naroff14108da2009-07-10 23:34:53 +00005593 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005594 }
Steve Naroff14108da2009-07-10 23:34:53 +00005595
John McCalldaa8e4e2010-11-15 09:13:47 +00005596 if (lhsType->isIntegerType()) {
5597 Kind = CK_PointerToIntegral;
Steve Naroff14108da2009-07-10 23:34:53 +00005598 return PointerToInt;
John McCalldaa8e4e2010-11-15 09:13:47 +00005599 }
5600
5601 Kind = CK_BitCast;
Steve Naroff14108da2009-07-10 23:34:53 +00005602
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005603 // In general, C pointers are not compatible with ObjC object pointers.
Steve Naroff14108da2009-07-10 23:34:53 +00005604 if (isa<PointerType>(lhsType)) {
Steve Naroff67ef8ea2009-07-20 17:56:53 +00005605 if (lhsType->isVoidPointerType()) // an exception to the rule.
5606 return Compatible;
5607 return IncompatiblePointer;
Steve Naroff14108da2009-07-10 23:34:53 +00005608 }
5609 if (isa<BlockPointerType>(lhsType) &&
John McCalldaa8e4e2010-11-15 09:13:47 +00005610 rhsType->getAs<PointerType>()->getPointeeType()->isVoidType()) {
5611 Kind = CK_AnyPointerToBlockPointerCast;
Steve Naroff14108da2009-07-10 23:34:53 +00005612 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005613 }
Steve Naroff14108da2009-07-10 23:34:53 +00005614 return Incompatible;
5615 }
Eli Friedmanf8f873d2008-05-30 18:07:22 +00005616
Chris Lattnerfc144e22008-01-04 23:18:45 +00005617 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005618 if (Context.typesAreCompatible(lhsType, rhsType)) {
5619 Kind = CK_NoOp;
Reid Spencer5f016e22007-07-11 17:01:13 +00005620 return Compatible;
John McCalldaa8e4e2010-11-15 09:13:47 +00005621 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005622 }
5623 return Incompatible;
5624}
5625
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005626/// \brief Constructs a transparent union from an expression that is
5627/// used to initialize the transparent union.
Mike Stump1eb44332009-09-09 15:08:12 +00005628static void ConstructTransparentUnion(ASTContext &C, Expr *&E,
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005629 QualType UnionType, FieldDecl *Field) {
5630 // Build an initializer list that designates the appropriate member
5631 // of the transparent union.
Ted Kremenek709210f2010-04-13 23:39:13 +00005632 InitListExpr *Initializer = new (C) InitListExpr(C, SourceLocation(),
Ted Kremenekba7bc552010-02-19 01:50:18 +00005633 &E, 1,
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005634 SourceLocation());
5635 Initializer->setType(UnionType);
5636 Initializer->setInitializedFieldInUnion(Field);
5637
5638 // Build a compound literal constructing a value of the transparent
5639 // union type from this initializer list.
John McCall42f56b52010-01-18 19:35:47 +00005640 TypeSourceInfo *unionTInfo = C.getTrivialTypeSourceInfo(UnionType);
John McCall1d7d8d62010-01-19 22:33:45 +00005641 E = new (C) CompoundLiteralExpr(SourceLocation(), unionTInfo, UnionType,
John McCallf89e55a2010-11-18 06:31:45 +00005642 VK_RValue, Initializer, false);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005643}
5644
5645Sema::AssignConvertType
5646Sema::CheckTransparentUnionArgumentConstraints(QualType ArgType, Expr *&rExpr) {
5647 QualType FromType = rExpr->getType();
5648
Mike Stump1eb44332009-09-09 15:08:12 +00005649 // If the ArgType is a Union type, we want to handle a potential
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005650 // transparent_union GCC extension.
5651 const RecordType *UT = ArgType->getAsUnionType();
Argyrios Kyrtzidis40b598e2009-06-30 02:34:44 +00005652 if (!UT || !UT->getDecl()->hasAttr<TransparentUnionAttr>())
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005653 return Incompatible;
5654
5655 // The field to initialize within the transparent union.
5656 RecordDecl *UD = UT->getDecl();
5657 FieldDecl *InitField = 0;
5658 // It's compatible if the expression matches any of the fields.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +00005659 for (RecordDecl::field_iterator it = UD->field_begin(),
5660 itend = UD->field_end();
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005661 it != itend; ++it) {
5662 if (it->getType()->isPointerType()) {
5663 // If the transparent union contains a pointer type, we allow:
5664 // 1) void pointer
5665 // 2) null pointer constant
5666 if (FromType->isPointerType())
Ted Kremenek6217b802009-07-29 21:53:49 +00005667 if (FromType->getAs<PointerType>()->getPointeeType()->isVoidType()) {
John McCall2de56d12010-08-25 11:45:40 +00005668 ImpCastExprToType(rExpr, it->getType(), CK_BitCast);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005669 InitField = *it;
5670 break;
5671 }
Mike Stump1eb44332009-09-09 15:08:12 +00005672
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005673 if (rExpr->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00005674 Expr::NPC_ValueDependentIsNull)) {
John McCall404cd162010-11-13 01:35:44 +00005675 ImpCastExprToType(rExpr, it->getType(), CK_NullToPointer);
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005676 InitField = *it;
5677 break;
5678 }
5679 }
5680
John McCall1c23e912010-11-16 02:32:08 +00005681 Expr *rhs = rExpr;
John McCalldaa8e4e2010-11-15 09:13:47 +00005682 CastKind Kind = CK_Invalid;
John McCall1c23e912010-11-16 02:32:08 +00005683 if (CheckAssignmentConstraints(it->getType(), rhs, Kind)
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005684 == Compatible) {
John McCall1c23e912010-11-16 02:32:08 +00005685 ImpCastExprToType(rhs, it->getType(), Kind);
5686 rExpr = rhs;
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005687 InitField = *it;
5688 break;
5689 }
5690 }
5691
5692 if (!InitField)
5693 return Incompatible;
5694
5695 ConstructTransparentUnion(Context, rExpr, ArgType, InitField);
5696 return Compatible;
5697}
5698
Chris Lattner5cf216b2008-01-04 18:04:52 +00005699Sema::AssignConvertType
Steve Naroff90045e82007-07-13 23:32:42 +00005700Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) {
Douglas Gregor98cd5992008-10-21 23:43:52 +00005701 if (getLangOptions().CPlusPlus) {
5702 if (!lhsType->isRecordType()) {
5703 // C++ 5.17p3: If the left operand is not of class type, the
5704 // expression is implicitly converted (C++ 4) to the
5705 // cv-unqualified type of the left operand.
Douglas Gregor45920e82008-12-19 17:40:08 +00005706 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(),
Douglas Gregor68647482009-12-16 03:45:30 +00005707 AA_Assigning))
Douglas Gregor98cd5992008-10-21 23:43:52 +00005708 return Incompatible;
Chris Lattner2c4463f2009-04-12 09:02:39 +00005709 return Compatible;
Douglas Gregor98cd5992008-10-21 23:43:52 +00005710 }
5711
5712 // FIXME: Currently, we fall through and treat C++ classes like C
5713 // structures.
5714 }
5715
Steve Naroff529a4ad2007-11-27 17:58:44 +00005716 // C99 6.5.16.1p1: the left operand is a pointer and the right is
5717 // a null pointer constant.
Mike Stump1eb44332009-09-09 15:08:12 +00005718 if ((lhsType->isPointerType() ||
5719 lhsType->isObjCObjectPointerType() ||
Mike Stumpeed9cac2009-02-19 03:04:26 +00005720 lhsType->isBlockPointerType())
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005721 && rExpr->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00005722 Expr::NPC_ValueDependentIsNull)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005723 ImpCastExprToType(rExpr, lhsType, CK_NullToPointer);
Steve Naroff529a4ad2007-11-27 17:58:44 +00005724 return Compatible;
5725 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005726
Chris Lattner943140e2007-10-16 02:55:40 +00005727 // This check seems unnatural, however it is necessary to ensure the proper
Steve Naroff90045e82007-07-13 23:32:42 +00005728 // conversion of functions/arrays. If the conversion were done for all
Douglas Gregor02a24ee2009-11-03 16:56:39 +00005729 // DeclExpr's (created by ActOnIdExpression), it would mess up the unary
Nick Lewyckyc133e9e2010-08-05 06:27:49 +00005730 // expressions that suppress this implicit conversion (&, sizeof).
Chris Lattner943140e2007-10-16 02:55:40 +00005731 //
Mike Stumpeed9cac2009-02-19 03:04:26 +00005732 // Suppress this for references: C++ 8.5.3p5.
Chris Lattner943140e2007-10-16 02:55:40 +00005733 if (!lhsType->isReferenceType())
Douglas Gregora873dfc2010-02-03 00:27:59 +00005734 DefaultFunctionArrayLvalueConversion(rExpr);
Steve Narofff1120de2007-08-24 22:33:52 +00005735
John McCalldaa8e4e2010-11-15 09:13:47 +00005736 CastKind Kind = CK_Invalid;
Chris Lattner5cf216b2008-01-04 18:04:52 +00005737 Sema::AssignConvertType result =
John McCall1c23e912010-11-16 02:32:08 +00005738 CheckAssignmentConstraints(lhsType, rExpr, Kind);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005739
Steve Narofff1120de2007-08-24 22:33:52 +00005740 // C99 6.5.16.1p2: The value of the right operand is converted to the
5741 // type of the assignment expression.
Douglas Gregor9d293df2008-10-28 00:22:11 +00005742 // CheckAssignmentConstraints allows the left-hand side to be a reference,
5743 // so that we can use references in built-in functions even in C.
5744 // The getNonReferenceType() call makes sure that the resulting expression
5745 // does not have reference type.
Douglas Gregor0c74e8a2009-04-29 22:16:16 +00005746 if (result != Incompatible && rExpr->getType() != lhsType)
John McCalldaa8e4e2010-11-15 09:13:47 +00005747 ImpCastExprToType(rExpr, lhsType.getNonLValueExprType(Context), Kind);
Steve Narofff1120de2007-08-24 22:33:52 +00005748 return result;
Steve Naroff90045e82007-07-13 23:32:42 +00005749}
5750
Chris Lattner29a1cfb2008-11-18 01:30:42 +00005751QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00005752 Diag(Loc, diag::err_typecheck_invalid_operands)
Chris Lattner22caddc2008-11-23 09:13:29 +00005753 << lex->getType() << rex->getType()
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00005754 << lex->getSourceRange() << rex->getSourceRange();
Chris Lattnerca5eede2007-12-12 05:47:28 +00005755 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00005756}
5757
Chris Lattner7ef655a2010-01-12 21:23:57 +00005758QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) {
Mike Stumpeed9cac2009-02-19 03:04:26 +00005759 // For conversion purposes, we ignore any qualifiers.
Nate Begeman1330b0e2008-04-04 01:30:25 +00005760 // For example, "const float" and "float" are equivalent.
Chris Lattnerb77792e2008-07-26 22:17:49 +00005761 QualType lhsType =
5762 Context.getCanonicalType(lex->getType()).getUnqualifiedType();
5763 QualType rhsType =
5764 Context.getCanonicalType(rex->getType()).getUnqualifiedType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005765
Nate Begemanbe2341d2008-07-14 18:02:46 +00005766 // If the vector types are identical, return.
Nate Begeman1330b0e2008-04-04 01:30:25 +00005767 if (lhsType == rhsType)
Reid Spencer5f016e22007-07-11 17:01:13 +00005768 return lhsType;
Nate Begeman4119d1a2007-12-30 02:59:45 +00005769
Nate Begemanbe2341d2008-07-14 18:02:46 +00005770 // Handle the case of a vector & extvector type of the same size and element
5771 // type. It would be nice if we only had one vector type someday.
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00005772 if (getLangOptions().LaxVectorConversions) {
John McCall183700f2009-09-21 23:43:11 +00005773 if (const VectorType *LV = lhsType->getAs<VectorType>()) {
Chandler Carruth629f9e42010-08-30 07:36:24 +00005774 if (const VectorType *RV = rhsType->getAs<VectorType>()) {
Nate Begemanbe2341d2008-07-14 18:02:46 +00005775 if (LV->getElementType() == RV->getElementType() &&
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00005776 LV->getNumElements() == RV->getNumElements()) {
Douglas Gregor26bcf672010-05-19 03:21:00 +00005777 if (lhsType->isExtVectorType()) {
John McCall2de56d12010-08-25 11:45:40 +00005778 ImpCastExprToType(rex, lhsType, CK_BitCast);
Douglas Gregor26bcf672010-05-19 03:21:00 +00005779 return lhsType;
5780 }
5781
John McCall2de56d12010-08-25 11:45:40 +00005782 ImpCastExprToType(lex, rhsType, CK_BitCast);
Douglas Gregor26bcf672010-05-19 03:21:00 +00005783 return rhsType;
Eric Christophere84f9eb2010-08-26 00:42:16 +00005784 } else if (Context.getTypeSize(lhsType) ==Context.getTypeSize(rhsType)){
5785 // If we are allowing lax vector conversions, and LHS and RHS are both
5786 // vectors, the total size only needs to be the same. This is a
5787 // bitcast; no bits are changed but the result type is different.
5788 ImpCastExprToType(rex, lhsType, CK_BitCast);
5789 return lhsType;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00005790 }
Eric Christophere84f9eb2010-08-26 00:42:16 +00005791 }
Chandler Carruth629f9e42010-08-30 07:36:24 +00005792 }
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00005793 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005794
Douglas Gregor255210e2010-08-06 10:14:59 +00005795 // Handle the case of equivalent AltiVec and GCC vector types
5796 if (lhsType->isVectorType() && rhsType->isVectorType() &&
5797 Context.areCompatibleVectorTypes(lhsType, rhsType)) {
John McCall2de56d12010-08-25 11:45:40 +00005798 ImpCastExprToType(lex, rhsType, CK_BitCast);
Douglas Gregor255210e2010-08-06 10:14:59 +00005799 return rhsType;
5800 }
5801
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005802 // Canonicalize the ExtVector to the LHS, remember if we swapped so we can
5803 // swap back (so that we don't reverse the inputs to a subtract, for instance.
5804 bool swapped = false;
5805 if (rhsType->isExtVectorType()) {
5806 swapped = true;
5807 std::swap(rex, lex);
5808 std::swap(rhsType, lhsType);
5809 }
Mike Stump1eb44332009-09-09 15:08:12 +00005810
Nate Begemandde25982009-06-28 19:12:57 +00005811 // Handle the case of an ext vector and scalar.
John McCall183700f2009-09-21 23:43:11 +00005812 if (const ExtVectorType *LV = lhsType->getAs<ExtVectorType>()) {
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005813 QualType EltTy = LV->getElementType();
Douglas Gregor9d3347a2010-06-16 00:35:25 +00005814 if (EltTy->isIntegralType(Context) && rhsType->isIntegralType(Context)) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005815 int order = Context.getIntegerTypeOrder(EltTy, rhsType);
5816 if (order > 0)
5817 ImpCastExprToType(rex, EltTy, CK_IntegralCast);
5818 if (order >= 0) {
5819 ImpCastExprToType(rex, lhsType, CK_VectorSplat);
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005820 if (swapped) std::swap(rex, lex);
5821 return lhsType;
5822 }
5823 }
5824 if (EltTy->isRealFloatingType() && rhsType->isScalarType() &&
5825 rhsType->isRealFloatingType()) {
John McCalldaa8e4e2010-11-15 09:13:47 +00005826 int order = Context.getFloatingTypeOrder(EltTy, rhsType);
5827 if (order > 0)
5828 ImpCastExprToType(rex, EltTy, CK_FloatingCast);
5829 if (order >= 0) {
5830 ImpCastExprToType(rex, lhsType, CK_VectorSplat);
Nate Begeman1bd1f6e2009-06-28 02:36:38 +00005831 if (swapped) std::swap(rex, lex);
5832 return lhsType;
5833 }
Nate Begeman4119d1a2007-12-30 02:59:45 +00005834 }
5835 }
Mike Stump1eb44332009-09-09 15:08:12 +00005836
Nate Begemandde25982009-06-28 19:12:57 +00005837 // Vectors of different size or scalar and non-ext-vector are errors.
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00005838 Diag(Loc, diag::err_typecheck_vector_not_convertable)
Chris Lattnerd1625842008-11-24 06:25:27 +00005839 << lex->getType() << rex->getType()
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00005840 << lex->getSourceRange() << rex->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00005841 return QualType();
Sebastian Redl22460502009-02-07 00:15:38 +00005842}
5843
Chris Lattner7ef655a2010-01-12 21:23:57 +00005844QualType Sema::CheckMultiplyDivideOperands(
5845 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign, bool isDiv) {
Daniel Dunbar69d1d002009-01-05 22:42:10 +00005846 if (lex->getType()->isVectorType() || rex->getType()->isVectorType())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00005847 return CheckVectorOperands(Loc, lex, rex);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005848
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00005849 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005850
Chris Lattner7ef655a2010-01-12 21:23:57 +00005851 if (!lex->getType()->isArithmeticType() ||
5852 !rex->getType()->isArithmeticType())
5853 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005854
Chris Lattner7ef655a2010-01-12 21:23:57 +00005855 // Check for division by zero.
5856 if (isDiv &&
5857 rex->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005858 DiagRuntimeBehavior(Loc, PDiag(diag::warn_division_by_zero)
Chris Lattnercb329c52010-01-12 21:30:55 +00005859 << rex->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005860
Chris Lattner7ef655a2010-01-12 21:23:57 +00005861 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00005862}
5863
Chris Lattner7ef655a2010-01-12 21:23:57 +00005864QualType Sema::CheckRemainderOperands(
Mike Stump1eb44332009-09-09 15:08:12 +00005865 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) {
Daniel Dunbar523aa602009-01-05 22:55:36 +00005866 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) {
Douglas Gregorf6094622010-07-23 15:58:24 +00005867 if (lex->getType()->hasIntegerRepresentation() &&
5868 rex->getType()->hasIntegerRepresentation())
Daniel Dunbar523aa602009-01-05 22:55:36 +00005869 return CheckVectorOperands(Loc, lex, rex);
5870 return InvalidOperands(Loc, lex, rex);
5871 }
Steve Naroff90045e82007-07-13 23:32:42 +00005872
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00005873 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005874
Chris Lattner7ef655a2010-01-12 21:23:57 +00005875 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType())
5876 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005877
Chris Lattner7ef655a2010-01-12 21:23:57 +00005878 // Check for remainder by zero.
5879 if (rex->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
Chris Lattnercb329c52010-01-12 21:30:55 +00005880 DiagRuntimeBehavior(Loc, PDiag(diag::warn_remainder_by_zero)
5881 << rex->getSourceRange());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00005882
Chris Lattner7ef655a2010-01-12 21:23:57 +00005883 return compType;
Reid Spencer5f016e22007-07-11 17:01:13 +00005884}
5885
Chris Lattner7ef655a2010-01-12 21:23:57 +00005886QualType Sema::CheckAdditionOperands( // C99 6.5.6
Mike Stump1eb44332009-09-09 15:08:12 +00005887 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00005888 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) {
5889 QualType compType = CheckVectorOperands(Loc, lex, rex);
5890 if (CompLHSTy) *CompLHSTy = compType;
5891 return compType;
5892 }
Steve Naroff49b45262007-07-13 16:58:59 +00005893
Eli Friedmanab3a8522009-03-28 01:22:36 +00005894 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy);
Eli Friedmand72d16e2008-05-18 18:08:51 +00005895
Reid Spencer5f016e22007-07-11 17:01:13 +00005896 // handle the common case first (both operands are arithmetic).
Eli Friedmanab3a8522009-03-28 01:22:36 +00005897 if (lex->getType()->isArithmeticType() &&
5898 rex->getType()->isArithmeticType()) {
5899 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00005900 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00005901 }
Reid Spencer5f016e22007-07-11 17:01:13 +00005902
Eli Friedmand72d16e2008-05-18 18:08:51 +00005903 // Put any potential pointer into PExp
5904 Expr* PExp = lex, *IExp = rex;
Steve Naroff58f9f2c2009-07-14 18:25:06 +00005905 if (IExp->getType()->isAnyPointerType())
Eli Friedmand72d16e2008-05-18 18:08:51 +00005906 std::swap(PExp, IExp);
5907
Steve Naroff58f9f2c2009-07-14 18:25:06 +00005908 if (PExp->getType()->isAnyPointerType()) {
Mike Stump1eb44332009-09-09 15:08:12 +00005909
Eli Friedmand72d16e2008-05-18 18:08:51 +00005910 if (IExp->getType()->isIntegerType()) {
Steve Naroff760e3c42009-07-13 21:20:41 +00005911 QualType PointeeTy = PExp->getType()->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00005912
Chris Lattnerb5f15622009-04-24 23:50:08 +00005913 // Check for arithmetic on pointers to incomplete types.
5914 if (PointeeTy->isVoidType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00005915 if (getLangOptions().CPlusPlus) {
5916 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
Chris Lattnerfa25bbb2008-11-19 05:08:23 +00005917 << lex->getSourceRange() << rex->getSourceRange();
Douglas Gregor4ec339f2009-01-19 19:26:10 +00005918 return QualType();
Eli Friedmand72d16e2008-05-18 18:08:51 +00005919 }
Douglas Gregore7450f52009-03-24 19:52:54 +00005920
5921 // GNU extension: arithmetic on pointer to void
5922 Diag(Loc, diag::ext_gnu_void_ptr)
5923 << lex->getSourceRange() << rex->getSourceRange();
Chris Lattnerb5f15622009-04-24 23:50:08 +00005924 } else if (PointeeTy->isFunctionType()) {
Douglas Gregore7450f52009-03-24 19:52:54 +00005925 if (getLangOptions().CPlusPlus) {
5926 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
5927 << lex->getType() << lex->getSourceRange();
5928 return QualType();
5929 }
5930
5931 // GNU extension: arithmetic on pointer to function
5932 Diag(Loc, diag::ext_gnu_ptr_func_arith)
5933 << lex->getType() << lex->getSourceRange();
Steve Naroff9deaeca2009-07-13 21:32:29 +00005934 } else {
Steve Naroff760e3c42009-07-13 21:20:41 +00005935 // Check if we require a complete type.
Mike Stump1eb44332009-09-09 15:08:12 +00005936 if (((PExp->getType()->isPointerType() &&
Steve Naroff9deaeca2009-07-13 21:32:29 +00005937 !PExp->getType()->isDependentType()) ||
Steve Naroff760e3c42009-07-13 21:20:41 +00005938 PExp->getType()->isObjCObjectPointerType()) &&
5939 RequireCompleteType(Loc, PointeeTy,
Mike Stump1eb44332009-09-09 15:08:12 +00005940 PDiag(diag::err_typecheck_arithmetic_incomplete_type)
5941 << PExp->getSourceRange()
Anders Carlssond497ba72009-08-26 22:59:12 +00005942 << PExp->getType()))
Steve Naroff760e3c42009-07-13 21:20:41 +00005943 return QualType();
5944 }
Chris Lattnerb5f15622009-04-24 23:50:08 +00005945 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00005946 if (PointeeTy->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattnerb5f15622009-04-24 23:50:08 +00005947 Diag(Loc, diag::err_arithmetic_nonfragile_interface)
5948 << PointeeTy << PExp->getSourceRange();
5949 return QualType();
5950 }
Mike Stump1eb44332009-09-09 15:08:12 +00005951
Eli Friedmanab3a8522009-03-28 01:22:36 +00005952 if (CompLHSTy) {
Eli Friedman04e83572009-08-20 04:21:42 +00005953 QualType LHSTy = Context.isPromotableBitField(lex);
5954 if (LHSTy.isNull()) {
5955 LHSTy = lex->getType();
5956 if (LHSTy->isPromotableIntegerType())
5957 LHSTy = Context.getPromotedIntegerType(LHSTy);
Douglas Gregor2d833e32009-05-02 00:36:19 +00005958 }
Eli Friedmanab3a8522009-03-28 01:22:36 +00005959 *CompLHSTy = LHSTy;
5960 }
Eli Friedmand72d16e2008-05-18 18:08:51 +00005961 return PExp->getType();
5962 }
5963 }
5964
Chris Lattner29a1cfb2008-11-18 01:30:42 +00005965 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00005966}
5967
Chris Lattnereca7be62008-04-07 05:30:13 +00005968// C99 6.5.6
5969QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex,
Eli Friedmanab3a8522009-03-28 01:22:36 +00005970 SourceLocation Loc, QualType* CompLHSTy) {
5971 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) {
5972 QualType compType = CheckVectorOperands(Loc, lex, rex);
5973 if (CompLHSTy) *CompLHSTy = compType;
5974 return compType;
5975 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00005976
Eli Friedmanab3a8522009-03-28 01:22:36 +00005977 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy);
Mike Stumpeed9cac2009-02-19 03:04:26 +00005978
Chris Lattner6e4ab612007-12-09 21:53:25 +00005979 // Enforce type constraints: C99 6.5.6p3.
Mike Stumpeed9cac2009-02-19 03:04:26 +00005980
Chris Lattner6e4ab612007-12-09 21:53:25 +00005981 // Handle the common case first (both operands are arithmetic).
Mike Stumpaf199f32009-05-07 18:43:07 +00005982 if (lex->getType()->isArithmeticType()
5983 && rex->getType()->isArithmeticType()) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00005984 if (CompLHSTy) *CompLHSTy = compType;
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00005985 return compType;
Eli Friedmanab3a8522009-03-28 01:22:36 +00005986 }
Mike Stump1eb44332009-09-09 15:08:12 +00005987
Chris Lattner6e4ab612007-12-09 21:53:25 +00005988 // Either ptr - int or ptr - ptr.
Steve Naroff58f9f2c2009-07-14 18:25:06 +00005989 if (lex->getType()->isAnyPointerType()) {
Steve Naroff430ee5a2009-07-13 17:19:15 +00005990 QualType lpointee = lex->getType()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00005991
Douglas Gregore7450f52009-03-24 19:52:54 +00005992 // The LHS must be an completely-defined object type.
Douglas Gregorc983b862009-01-23 00:36:41 +00005993
Douglas Gregore7450f52009-03-24 19:52:54 +00005994 bool ComplainAboutVoid = false;
5995 Expr *ComplainAboutFunc = 0;
5996 if (lpointee->isVoidType()) {
5997 if (getLangOptions().CPlusPlus) {
5998 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
5999 << lex->getSourceRange() << rex->getSourceRange();
6000 return QualType();
6001 }
6002
6003 // GNU C extension: arithmetic on pointer to void
6004 ComplainAboutVoid = true;
6005 } else if (lpointee->isFunctionType()) {
6006 if (getLangOptions().CPlusPlus) {
6007 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
Chris Lattnerd1625842008-11-24 06:25:27 +00006008 << lex->getType() << lex->getSourceRange();
Chris Lattner6e4ab612007-12-09 21:53:25 +00006009 return QualType();
6010 }
Douglas Gregore7450f52009-03-24 19:52:54 +00006011
6012 // GNU C extension: arithmetic on pointer to function
6013 ComplainAboutFunc = lex;
6014 } else if (!lpointee->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +00006015 RequireCompleteType(Loc, lpointee,
Anders Carlssond497ba72009-08-26 22:59:12 +00006016 PDiag(diag::err_typecheck_sub_ptr_object)
Mike Stump1eb44332009-09-09 15:08:12 +00006017 << lex->getSourceRange()
Anders Carlssond497ba72009-08-26 22:59:12 +00006018 << lex->getType()))
Douglas Gregore7450f52009-03-24 19:52:54 +00006019 return QualType();
Chris Lattner6e4ab612007-12-09 21:53:25 +00006020
Chris Lattnerb5f15622009-04-24 23:50:08 +00006021 // Diagnose bad cases where we step over interface counts.
John McCallc12c5bb2010-05-15 11:32:37 +00006022 if (lpointee->isObjCObjectType() && LangOpts.ObjCNonFragileABI) {
Chris Lattnerb5f15622009-04-24 23:50:08 +00006023 Diag(Loc, diag::err_arithmetic_nonfragile_interface)
6024 << lpointee << lex->getSourceRange();
6025 return QualType();
6026 }
Mike Stump1eb44332009-09-09 15:08:12 +00006027
Chris Lattner6e4ab612007-12-09 21:53:25 +00006028 // The result type of a pointer-int computation is the pointer type.
Douglas Gregore7450f52009-03-24 19:52:54 +00006029 if (rex->getType()->isIntegerType()) {
6030 if (ComplainAboutVoid)
6031 Diag(Loc, diag::ext_gnu_void_ptr)
6032 << lex->getSourceRange() << rex->getSourceRange();
6033 if (ComplainAboutFunc)
6034 Diag(Loc, diag::ext_gnu_ptr_func_arith)
Mike Stump1eb44332009-09-09 15:08:12 +00006035 << ComplainAboutFunc->getType()
Douglas Gregore7450f52009-03-24 19:52:54 +00006036 << ComplainAboutFunc->getSourceRange();
6037
Eli Friedmanab3a8522009-03-28 01:22:36 +00006038 if (CompLHSTy) *CompLHSTy = lex->getType();
Chris Lattner6e4ab612007-12-09 21:53:25 +00006039 return lex->getType();
Douglas Gregore7450f52009-03-24 19:52:54 +00006040 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006041
Chris Lattner6e4ab612007-12-09 21:53:25 +00006042 // Handle pointer-pointer subtractions.
Ted Kremenek6217b802009-07-29 21:53:49 +00006043 if (const PointerType *RHSPTy = rex->getType()->getAs<PointerType>()) {
Eli Friedman8e54ad02008-02-08 01:19:44 +00006044 QualType rpointee = RHSPTy->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006045
Douglas Gregore7450f52009-03-24 19:52:54 +00006046 // RHS must be a completely-type object type.
6047 // Handle the GNU void* extension.
6048 if (rpointee->isVoidType()) {
6049 if (getLangOptions().CPlusPlus) {
6050 Diag(Loc, diag::err_typecheck_pointer_arith_void_type)
6051 << lex->getSourceRange() << rex->getSourceRange();
6052 return QualType();
6053 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006054
Douglas Gregore7450f52009-03-24 19:52:54 +00006055 ComplainAboutVoid = true;
6056 } else if (rpointee->isFunctionType()) {
6057 if (getLangOptions().CPlusPlus) {
6058 Diag(Loc, diag::err_typecheck_pointer_arith_function_type)
Chris Lattnerd1625842008-11-24 06:25:27 +00006059 << rex->getType() << rex->getSourceRange();
Chris Lattner6e4ab612007-12-09 21:53:25 +00006060 return QualType();
6061 }
Douglas Gregore7450f52009-03-24 19:52:54 +00006062
6063 // GNU extension: arithmetic on pointer to function
6064 if (!ComplainAboutFunc)
6065 ComplainAboutFunc = rex;
6066 } else if (!rpointee->isDependentType() &&
6067 RequireCompleteType(Loc, rpointee,
Anders Carlssond497ba72009-08-26 22:59:12 +00006068 PDiag(diag::err_typecheck_sub_ptr_object)
6069 << rex->getSourceRange()
6070 << rex->getType()))
Douglas Gregore7450f52009-03-24 19:52:54 +00006071 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006072
Eli Friedman88d936b2009-05-16 13:54:38 +00006073 if (getLangOptions().CPlusPlus) {
6074 // Pointee types must be the same: C++ [expr.add]
6075 if (!Context.hasSameUnqualifiedType(lpointee, rpointee)) {
6076 Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
6077 << lex->getType() << rex->getType()
6078 << lex->getSourceRange() << rex->getSourceRange();
6079 return QualType();
6080 }
6081 } else {
6082 // Pointee types must be compatible C99 6.5.6p3
6083 if (!Context.typesAreCompatible(
6084 Context.getCanonicalType(lpointee).getUnqualifiedType(),
6085 Context.getCanonicalType(rpointee).getUnqualifiedType())) {
6086 Diag(Loc, diag::err_typecheck_sub_ptr_compatible)
6087 << lex->getType() << rex->getType()
6088 << lex->getSourceRange() << rex->getSourceRange();
6089 return QualType();
6090 }
Chris Lattner6e4ab612007-12-09 21:53:25 +00006091 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006092
Douglas Gregore7450f52009-03-24 19:52:54 +00006093 if (ComplainAboutVoid)
6094 Diag(Loc, diag::ext_gnu_void_ptr)
6095 << lex->getSourceRange() << rex->getSourceRange();
6096 if (ComplainAboutFunc)
6097 Diag(Loc, diag::ext_gnu_ptr_func_arith)
Mike Stump1eb44332009-09-09 15:08:12 +00006098 << ComplainAboutFunc->getType()
Douglas Gregore7450f52009-03-24 19:52:54 +00006099 << ComplainAboutFunc->getSourceRange();
Eli Friedmanab3a8522009-03-28 01:22:36 +00006100
6101 if (CompLHSTy) *CompLHSTy = lex->getType();
Chris Lattner6e4ab612007-12-09 21:53:25 +00006102 return Context.getPointerDiffType();
6103 }
6104 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006105
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006106 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00006107}
6108
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006109static bool isScopedEnumerationType(QualType T) {
6110 if (const EnumType *ET = dyn_cast<EnumType>(T))
6111 return ET->getDecl()->isScoped();
6112 return false;
6113}
6114
Chris Lattnereca7be62008-04-07 05:30:13 +00006115// C99 6.5.7
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006116QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc,
Chris Lattnereca7be62008-04-07 05:30:13 +00006117 bool isCompAssign) {
Chris Lattnerca5eede2007-12-12 05:47:28 +00006118 // C99 6.5.7p2: Each of the operands shall have integer type.
Douglas Gregorf6094622010-07-23 15:58:24 +00006119 if (!lex->getType()->hasIntegerRepresentation() ||
6120 !rex->getType()->hasIntegerRepresentation())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006121 return InvalidOperands(Loc, lex, rex);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006122
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006123 // C++0x: Don't allow scoped enums. FIXME: Use something better than
6124 // hasIntegerRepresentation() above instead of this.
6125 if (isScopedEnumerationType(lex->getType()) ||
6126 isScopedEnumerationType(rex->getType())) {
6127 return InvalidOperands(Loc, lex, rex);
6128 }
6129
Nate Begeman2207d792009-10-25 02:26:48 +00006130 // Vector shifts promote their scalar inputs to vector type.
6131 if (lex->getType()->isVectorType() || rex->getType()->isVectorType())
6132 return CheckVectorOperands(Loc, lex, rex);
6133
Chris Lattnerca5eede2007-12-12 05:47:28 +00006134 // Shifts don't perform usual arithmetic conversions, they just do integer
6135 // promotions on each operand. C99 6.5.7p3
Eli Friedman04e83572009-08-20 04:21:42 +00006136 QualType LHSTy = Context.isPromotableBitField(lex);
6137 if (LHSTy.isNull()) {
6138 LHSTy = lex->getType();
6139 if (LHSTy->isPromotableIntegerType())
6140 LHSTy = Context.getPromotedIntegerType(LHSTy);
Douglas Gregor2d833e32009-05-02 00:36:19 +00006141 }
Chris Lattner1dcf2c82007-12-13 07:28:16 +00006142 if (!isCompAssign)
John McCall2de56d12010-08-25 11:45:40 +00006143 ImpCastExprToType(lex, LHSTy, CK_IntegralCast);
Eli Friedmanab3a8522009-03-28 01:22:36 +00006144
Chris Lattnerca5eede2007-12-12 05:47:28 +00006145 UsualUnaryConversions(rex);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006146
Ryan Flynnd0439682009-08-07 16:20:20 +00006147 // Sanity-check shift operands
6148 llvm::APSInt Right;
6149 // Check right/shifter operand
Daniel Dunbar3f180c62009-09-17 06:31:27 +00006150 if (!rex->isValueDependent() &&
6151 rex->isIntegerConstantExpr(Right, Context)) {
Ryan Flynn8045c732009-08-08 19:18:23 +00006152 if (Right.isNegative())
Ryan Flynnd0439682009-08-07 16:20:20 +00006153 Diag(Loc, diag::warn_shift_negative) << rex->getSourceRange();
6154 else {
6155 llvm::APInt LeftBits(Right.getBitWidth(),
6156 Context.getTypeSize(lex->getType()));
6157 if (Right.uge(LeftBits))
6158 Diag(Loc, diag::warn_shift_gt_typewidth) << rex->getSourceRange();
6159 }
6160 }
6161
Chris Lattnerca5eede2007-12-12 05:47:28 +00006162 // "The type of the result is that of the promoted left operand."
Eli Friedmanab3a8522009-03-28 01:22:36 +00006163 return LHSTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006164}
6165
Chandler Carruth99919472010-07-10 12:30:03 +00006166static bool IsWithinTemplateSpecialization(Decl *D) {
6167 if (DeclContext *DC = D->getDeclContext()) {
6168 if (isa<ClassTemplateSpecializationDecl>(DC))
6169 return true;
6170 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DC))
6171 return FD->isFunctionTemplateSpecialization();
6172 }
6173 return false;
6174}
6175
Douglas Gregor0c6db942009-05-04 06:07:12 +00006176// C99 6.5.8, C++ [expr.rel]
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006177QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc,
Douglas Gregora86b8322009-04-06 18:45:53 +00006178 unsigned OpaqueOpc, bool isRelational) {
John McCall2de56d12010-08-25 11:45:40 +00006179 BinaryOperatorKind Opc = (BinaryOperatorKind) OpaqueOpc;
Douglas Gregora86b8322009-04-06 18:45:53 +00006180
Chris Lattner02dd4b12009-12-05 05:40:13 +00006181 // Handle vector comparisons separately.
Nate Begemanbe2341d2008-07-14 18:02:46 +00006182 if (lex->getType()->isVectorType() || rex->getType()->isVectorType())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006183 return CheckVectorCompareOperands(lex, rex, Loc, isRelational);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006184
Steve Naroffc80b4ee2007-07-16 21:54:35 +00006185 QualType lType = lex->getType();
6186 QualType rType = rex->getType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006187
Douglas Gregor8eee1192010-06-22 22:12:46 +00006188 if (!lType->hasFloatingRepresentation() &&
Ted Kremenekfbcb0eb2010-09-16 00:03:01 +00006189 !(lType->isBlockPointerType() && isRelational) &&
6190 !lex->getLocStart().isMacroID() &&
6191 !rex->getLocStart().isMacroID()) {
Chris Lattner55660a72009-03-08 19:39:53 +00006192 // For non-floating point types, check for self-comparisons of the form
6193 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
6194 // often indicate logic errors in the program.
Chandler Carruth64d092c2010-07-12 06:23:38 +00006195 //
6196 // NOTE: Don't warn about comparison expressions resulting from macro
6197 // expansion. Also don't warn about comparisons which are only self
6198 // comparisons within a template specialization. The warnings should catch
6199 // obvious cases in the definition of the template anyways. The idea is to
6200 // warn when the typed comparison operator will always evaluate to the same
6201 // result.
Chris Lattner55660a72009-03-08 19:39:53 +00006202 Expr *LHSStripped = lex->IgnoreParens();
6203 Expr *RHSStripped = rex->IgnoreParens();
Chandler Carruth99919472010-07-10 12:30:03 +00006204 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) {
Douglas Gregord64fdd02010-06-08 19:50:34 +00006205 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) {
Ted Kremenekfbcb0eb2010-09-16 00:03:01 +00006206 if (DRL->getDecl() == DRR->getDecl() &&
Chandler Carruth99919472010-07-10 12:30:03 +00006207 !IsWithinTemplateSpecialization(DRL->getDecl())) {
Douglas Gregord64fdd02010-06-08 19:50:34 +00006208 DiagRuntimeBehavior(Loc, PDiag(diag::warn_comparison_always)
6209 << 0 // self-
John McCall2de56d12010-08-25 11:45:40 +00006210 << (Opc == BO_EQ
6211 || Opc == BO_LE
6212 || Opc == BO_GE));
Douglas Gregord64fdd02010-06-08 19:50:34 +00006213 } else if (lType->isArrayType() && rType->isArrayType() &&
6214 !DRL->getDecl()->getType()->isReferenceType() &&
6215 !DRR->getDecl()->getType()->isReferenceType()) {
6216 // what is it always going to eval to?
6217 char always_evals_to;
6218 switch(Opc) {
John McCall2de56d12010-08-25 11:45:40 +00006219 case BO_EQ: // e.g. array1 == array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00006220 always_evals_to = 0; // false
6221 break;
John McCall2de56d12010-08-25 11:45:40 +00006222 case BO_NE: // e.g. array1 != array2
Douglas Gregord64fdd02010-06-08 19:50:34 +00006223 always_evals_to = 1; // true
6224 break;
6225 default:
6226 // best we can say is 'a constant'
6227 always_evals_to = 2; // e.g. array1 <= array2
6228 break;
6229 }
6230 DiagRuntimeBehavior(Loc, PDiag(diag::warn_comparison_always)
6231 << 1 // array
6232 << always_evals_to);
6233 }
6234 }
Chandler Carruth99919472010-07-10 12:30:03 +00006235 }
Mike Stump1eb44332009-09-09 15:08:12 +00006236
Chris Lattner55660a72009-03-08 19:39:53 +00006237 if (isa<CastExpr>(LHSStripped))
6238 LHSStripped = LHSStripped->IgnoreParenCasts();
6239 if (isa<CastExpr>(RHSStripped))
6240 RHSStripped = RHSStripped->IgnoreParenCasts();
Mike Stump1eb44332009-09-09 15:08:12 +00006241
Chris Lattner55660a72009-03-08 19:39:53 +00006242 // Warn about comparisons against a string constant (unless the other
6243 // operand is null), the user probably wants strcmp.
Douglas Gregora86b8322009-04-06 18:45:53 +00006244 Expr *literalString = 0;
6245 Expr *literalStringStripped = 0;
Chris Lattner55660a72009-03-08 19:39:53 +00006246 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006247 !RHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006248 Expr::NPC_ValueDependentIsNull)) {
Douglas Gregora86b8322009-04-06 18:45:53 +00006249 literalString = lex;
6250 literalStringStripped = LHSStripped;
Mike Stumpac5fc7c2009-08-04 21:02:39 +00006251 } else if ((isa<StringLiteral>(RHSStripped) ||
6252 isa<ObjCEncodeExpr>(RHSStripped)) &&
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006253 !LHSStripped->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006254 Expr::NPC_ValueDependentIsNull)) {
Douglas Gregora86b8322009-04-06 18:45:53 +00006255 literalString = rex;
6256 literalStringStripped = RHSStripped;
6257 }
6258
6259 if (literalString) {
6260 std::string resultComparison;
6261 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00006262 case BO_LT: resultComparison = ") < 0"; break;
6263 case BO_GT: resultComparison = ") > 0"; break;
6264 case BO_LE: resultComparison = ") <= 0"; break;
6265 case BO_GE: resultComparison = ") >= 0"; break;
6266 case BO_EQ: resultComparison = ") == 0"; break;
6267 case BO_NE: resultComparison = ") != 0"; break;
Douglas Gregora86b8322009-04-06 18:45:53 +00006268 default: assert(false && "Invalid comparison operator");
6269 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006270
Douglas Gregord1e4d9b2010-01-12 23:18:54 +00006271 DiagRuntimeBehavior(Loc,
6272 PDiag(diag::warn_stringcompare)
6273 << isa<ObjCEncodeExpr>(literalStringStripped)
Ted Kremenek03a4bee2010-04-09 20:26:53 +00006274 << literalString->getSourceRange());
Douglas Gregora86b8322009-04-06 18:45:53 +00006275 }
Ted Kremenek3ca0bf22007-10-29 16:58:49 +00006276 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006277
Douglas Gregord64fdd02010-06-08 19:50:34 +00006278 // C99 6.5.8p3 / C99 6.5.9p4
6279 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType())
6280 UsualArithmeticConversions(lex, rex);
6281 else {
6282 UsualUnaryConversions(lex);
6283 UsualUnaryConversions(rex);
6284 }
6285
6286 lType = lex->getType();
6287 rType = rex->getType();
6288
Douglas Gregor447b69e2008-11-19 03:25:36 +00006289 // The result of comparisons is 'bool' in C++, 'int' in C.
Chris Lattner02dd4b12009-12-05 05:40:13 +00006290 QualType ResultTy = getLangOptions().CPlusPlus ? Context.BoolTy:Context.IntTy;
Douglas Gregor447b69e2008-11-19 03:25:36 +00006291
Chris Lattnera5937dd2007-08-26 01:18:55 +00006292 if (isRelational) {
6293 if (lType->isRealType() && rType->isRealType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00006294 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00006295 } else {
Ted Kremenek72cb1ae2007-10-29 17:13:39 +00006296 // Check for comparisons of floating point operands using != and ==.
Douglas Gregor8eee1192010-06-22 22:12:46 +00006297 if (lType->hasFloatingRepresentation())
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006298 CheckFloatComparison(Loc,lex,rex);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006299
Chris Lattnera5937dd2007-08-26 01:18:55 +00006300 if (lType->isArithmeticType() && rType->isArithmeticType())
Douglas Gregor447b69e2008-11-19 03:25:36 +00006301 return ResultTy;
Chris Lattnera5937dd2007-08-26 01:18:55 +00006302 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006303
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006304 bool LHSIsNull = lex->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006305 Expr::NPC_ValueDependentIsNull);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006306 bool RHSIsNull = rex->isNullPointerConstant(Context,
Douglas Gregorce940492009-09-25 04:25:58 +00006307 Expr::NPC_ValueDependentIsNull);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006308
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006309 // All of the following pointer-related warnings are GCC extensions, except
6310 // when handling null pointer constants.
Steve Naroff77878cc2007-08-27 04:08:11 +00006311 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2
Chris Lattnerbc896f52008-04-03 05:07:25 +00006312 QualType LCanPointeeTy =
Ted Kremenek6217b802009-07-29 21:53:49 +00006313 Context.getCanonicalType(lType->getAs<PointerType>()->getPointeeType());
Chris Lattnerbc896f52008-04-03 05:07:25 +00006314 QualType RCanPointeeTy =
Ted Kremenek6217b802009-07-29 21:53:49 +00006315 Context.getCanonicalType(rType->getAs<PointerType>()->getPointeeType());
Mike Stumpeed9cac2009-02-19 03:04:26 +00006316
Douglas Gregor0c6db942009-05-04 06:07:12 +00006317 if (getLangOptions().CPlusPlus) {
Eli Friedman3075e762009-08-23 00:27:47 +00006318 if (LCanPointeeTy == RCanPointeeTy)
6319 return ResultTy;
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006320 if (!isRelational &&
6321 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
6322 // Valid unless comparison between non-null pointer and function pointer
6323 // This is a gcc extension compatibility comparison.
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006324 // In a SFINAE context, we treat this as a hard error to maintain
6325 // conformance with the C++ standard.
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006326 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
6327 && !LHSIsNull && !RHSIsNull) {
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006328 Diag(Loc,
6329 isSFINAEContext()?
6330 diag::err_typecheck_comparison_of_fptr_to_void
6331 : diag::ext_typecheck_comparison_of_fptr_to_void)
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006332 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006333
6334 if (isSFINAEContext())
6335 return QualType();
6336
John McCall2de56d12010-08-25 11:45:40 +00006337 ImpCastExprToType(rex, lType, CK_BitCast);
Fariborz Jahanian51874dd2009-12-21 18:19:17 +00006338 return ResultTy;
6339 }
6340 }
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006341
Douglas Gregor0c6db942009-05-04 06:07:12 +00006342 // C++ [expr.rel]p2:
6343 // [...] Pointer conversions (4.10) and qualification
6344 // conversions (4.4) are performed on pointer operands (or on
6345 // a pointer operand and a null pointer constant) to bring
6346 // them to their composite pointer type. [...]
6347 //
Douglas Gregor20b3e992009-08-24 17:42:35 +00006348 // C++ [expr.eq]p1 uses the same notion for (in)equality
Douglas Gregor0c6db942009-05-04 06:07:12 +00006349 // comparisons of pointers.
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006350 bool NonStandardCompositeType = false;
Douglas Gregor8f00dcf2010-04-16 23:20:25 +00006351 QualType T = FindCompositePointerType(Loc, lex, rex,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006352 isSFINAEContext()? 0 : &NonStandardCompositeType);
Douglas Gregor0c6db942009-05-04 06:07:12 +00006353 if (T.isNull()) {
6354 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers)
6355 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
6356 return QualType();
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006357 } else if (NonStandardCompositeType) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006358 Diag(Loc,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006359 diag::ext_typecheck_comparison_of_distinct_pointers_nonstandard)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006360 << lType << rType << T
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006361 << lex->getSourceRange() << rex->getSourceRange();
Douglas Gregor0c6db942009-05-04 06:07:12 +00006362 }
6363
John McCall2de56d12010-08-25 11:45:40 +00006364 ImpCastExprToType(lex, T, CK_BitCast);
6365 ImpCastExprToType(rex, T, CK_BitCast);
Douglas Gregor0c6db942009-05-04 06:07:12 +00006366 return ResultTy;
6367 }
Eli Friedman3075e762009-08-23 00:27:47 +00006368 // C99 6.5.9p2 and C99 6.5.8p2
6369 if (Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(),
6370 RCanPointeeTy.getUnqualifiedType())) {
6371 // Valid unless a relational comparison of function pointers
6372 if (isRelational && LCanPointeeTy->isFunctionType()) {
6373 Diag(Loc, diag::ext_typecheck_ordered_comparison_of_function_pointers)
6374 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
6375 }
6376 } else if (!isRelational &&
6377 (LCanPointeeTy->isVoidType() || RCanPointeeTy->isVoidType())) {
6378 // Valid unless comparison between non-null pointer and function pointer
6379 if ((LCanPointeeTy->isFunctionType() || RCanPointeeTy->isFunctionType())
6380 && !LHSIsNull && !RHSIsNull) {
6381 Diag(Loc, diag::ext_typecheck_comparison_of_fptr_to_void)
6382 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
6383 }
6384 } else {
6385 // Invalid
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00006386 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
Chris Lattnerd1625842008-11-24 06:25:27 +00006387 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00006388 }
Eli Friedman3075e762009-08-23 00:27:47 +00006389 if (LCanPointeeTy != RCanPointeeTy)
John McCall2de56d12010-08-25 11:45:40 +00006390 ImpCastExprToType(rex, lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006391 return ResultTy;
Steve Naroffe77fd3c2007-08-16 21:48:38 +00006392 }
Mike Stump1eb44332009-09-09 15:08:12 +00006393
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006394 if (getLangOptions().CPlusPlus) {
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006395 // Comparison of nullptr_t with itself.
6396 if (lType->isNullPtrType() && rType->isNullPtrType())
6397 return ResultTy;
6398
Mike Stump1eb44332009-09-09 15:08:12 +00006399 // Comparison of pointers with null pointer constants and equality
Douglas Gregor20b3e992009-08-24 17:42:35 +00006400 // comparisons of member pointers to null pointer constants.
Mike Stump1eb44332009-09-09 15:08:12 +00006401 if (RHSIsNull &&
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006402 ((lType->isPointerType() || lType->isNullPtrType()) ||
Douglas Gregor20b3e992009-08-24 17:42:35 +00006403 (!isRelational && lType->isMemberPointerType()))) {
Douglas Gregor443c2122010-08-07 13:36:37 +00006404 ImpCastExprToType(rex, lType,
6405 lType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00006406 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00006407 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006408 return ResultTy;
6409 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00006410 if (LHSIsNull &&
Anders Carlsson0c8209e2010-11-04 03:17:43 +00006411 ((rType->isPointerType() || rType->isNullPtrType()) ||
Douglas Gregor20b3e992009-08-24 17:42:35 +00006412 (!isRelational && rType->isMemberPointerType()))) {
Douglas Gregor443c2122010-08-07 13:36:37 +00006413 ImpCastExprToType(lex, rType,
6414 rType->isMemberPointerType()
John McCall2de56d12010-08-25 11:45:40 +00006415 ? CK_NullToMemberPointer
John McCall404cd162010-11-13 01:35:44 +00006416 : CK_NullToPointer);
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006417 return ResultTy;
6418 }
Douglas Gregor20b3e992009-08-24 17:42:35 +00006419
6420 // Comparison of member pointers.
Mike Stump1eb44332009-09-09 15:08:12 +00006421 if (!isRelational &&
Douglas Gregor20b3e992009-08-24 17:42:35 +00006422 lType->isMemberPointerType() && rType->isMemberPointerType()) {
6423 // C++ [expr.eq]p2:
Mike Stump1eb44332009-09-09 15:08:12 +00006424 // In addition, pointers to members can be compared, or a pointer to
6425 // member and a null pointer constant. Pointer to member conversions
6426 // (4.11) and qualification conversions (4.4) are performed to bring
6427 // them to a common type. If one operand is a null pointer constant,
6428 // the common type is the type of the other operand. Otherwise, the
6429 // common type is a pointer to member type similar (4.4) to the type
6430 // of one of the operands, with a cv-qualification signature (4.4)
6431 // that is the union of the cv-qualification signatures of the operand
Douglas Gregor20b3e992009-08-24 17:42:35 +00006432 // types.
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006433 bool NonStandardCompositeType = false;
Douglas Gregor8f00dcf2010-04-16 23:20:25 +00006434 QualType T = FindCompositePointerType(Loc, lex, rex,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006435 isSFINAEContext()? 0 : &NonStandardCompositeType);
Douglas Gregor20b3e992009-08-24 17:42:35 +00006436 if (T.isNull()) {
6437 Diag(Loc, diag::err_typecheck_comparison_of_distinct_pointers)
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006438 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
Douglas Gregor20b3e992009-08-24 17:42:35 +00006439 return QualType();
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006440 } else if (NonStandardCompositeType) {
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006441 Diag(Loc,
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006442 diag::ext_typecheck_comparison_of_distinct_pointers_nonstandard)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006443 << lType << rType << T
Douglas Gregorb2cb1cb2010-02-25 22:29:57 +00006444 << lex->getSourceRange() << rex->getSourceRange();
Douglas Gregor20b3e992009-08-24 17:42:35 +00006445 }
Mike Stump1eb44332009-09-09 15:08:12 +00006446
John McCall2de56d12010-08-25 11:45:40 +00006447 ImpCastExprToType(lex, T, CK_BitCast);
6448 ImpCastExprToType(rex, T, CK_BitCast);
Douglas Gregor20b3e992009-08-24 17:42:35 +00006449 return ResultTy;
6450 }
Sebastian Redl6e8ed162009-05-10 18:38:11 +00006451 }
Mike Stump1eb44332009-09-09 15:08:12 +00006452
Steve Naroff1c7d0672008-09-04 15:10:53 +00006453 // Handle block pointer types.
Mike Stumpdd3e1662009-05-07 03:14:14 +00006454 if (!isRelational && lType->isBlockPointerType() && rType->isBlockPointerType()) {
Ted Kremenek6217b802009-07-29 21:53:49 +00006455 QualType lpointee = lType->getAs<BlockPointerType>()->getPointeeType();
6456 QualType rpointee = rType->getAs<BlockPointerType>()->getPointeeType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006457
Steve Naroff1c7d0672008-09-04 15:10:53 +00006458 if (!LHSIsNull && !RHSIsNull &&
Eli Friedman26784c12009-06-08 05:08:54 +00006459 !Context.typesAreCompatible(lpointee, rpointee)) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00006460 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
Chris Lattnerd1625842008-11-24 06:25:27 +00006461 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
Steve Naroff1c7d0672008-09-04 15:10:53 +00006462 }
John McCall2de56d12010-08-25 11:45:40 +00006463 ImpCastExprToType(rex, lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006464 return ResultTy;
Steve Naroff1c7d0672008-09-04 15:10:53 +00006465 }
Steve Naroff59f53942008-09-28 01:11:11 +00006466 // Allow block pointers to be compared with null pointer constants.
Mike Stumpdd3e1662009-05-07 03:14:14 +00006467 if (!isRelational
6468 && ((lType->isBlockPointerType() && rType->isPointerType())
6469 || (lType->isPointerType() && rType->isBlockPointerType()))) {
Steve Naroff59f53942008-09-28 01:11:11 +00006470 if (!LHSIsNull && !RHSIsNull) {
Ted Kremenek6217b802009-07-29 21:53:49 +00006471 if (!((rType->isPointerType() && rType->getAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00006472 ->getPointeeType()->isVoidType())
Ted Kremenek6217b802009-07-29 21:53:49 +00006473 || (lType->isPointerType() && lType->getAs<PointerType>()
Mike Stumpdd3e1662009-05-07 03:14:14 +00006474 ->getPointeeType()->isVoidType())))
6475 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks)
6476 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
Steve Naroff59f53942008-09-28 01:11:11 +00006477 }
John McCall2de56d12010-08-25 11:45:40 +00006478 ImpCastExprToType(rex, lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006479 return ResultTy;
Steve Naroff59f53942008-09-28 01:11:11 +00006480 }
Steve Naroff1c7d0672008-09-04 15:10:53 +00006481
Steve Naroff14108da2009-07-10 23:34:53 +00006482 if ((lType->isObjCObjectPointerType() || rType->isObjCObjectPointerType())) {
Steve Naroffa5ad8632008-10-27 10:33:19 +00006483 if (lType->isPointerType() || rType->isPointerType()) {
Ted Kremenek6217b802009-07-29 21:53:49 +00006484 const PointerType *LPT = lType->getAs<PointerType>();
6485 const PointerType *RPT = rType->getAs<PointerType>();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006486 bool LPtrToVoid = LPT ?
Steve Naroffa8069f12008-11-17 19:49:16 +00006487 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006488 bool RPtrToVoid = RPT ?
Steve Naroffa8069f12008-11-17 19:49:16 +00006489 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006490
Steve Naroffa8069f12008-11-17 19:49:16 +00006491 if (!LPtrToVoid && !RPtrToVoid &&
6492 !Context.typesAreCompatible(lType, rType)) {
Chris Lattnerc9c7c4e2008-11-18 22:52:51 +00006493 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
Chris Lattnerd1625842008-11-24 06:25:27 +00006494 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
Steve Naroffa5ad8632008-10-27 10:33:19 +00006495 }
John McCall2de56d12010-08-25 11:45:40 +00006496 ImpCastExprToType(rex, lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006497 return ResultTy;
Steve Naroff87f3b932008-10-20 18:19:10 +00006498 }
Steve Naroff14108da2009-07-10 23:34:53 +00006499 if (lType->isObjCObjectPointerType() && rType->isObjCObjectPointerType()) {
Chris Lattner6365e3e2009-08-22 18:58:31 +00006500 if (!Context.areComparableObjCPointerTypes(lType, rType))
Steve Naroff14108da2009-07-10 23:34:53 +00006501 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers)
6502 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
John McCall2de56d12010-08-25 11:45:40 +00006503 ImpCastExprToType(rex, lType, CK_BitCast);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006504 return ResultTy;
Steve Naroff20373222008-06-03 14:04:54 +00006505 }
Fariborz Jahanian7359f042007-12-20 01:06:58 +00006506 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006507 if ((lType->isAnyPointerType() && rType->isIntegerType()) ||
6508 (lType->isIntegerType() && rType->isAnyPointerType())) {
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006509 unsigned DiagID = 0;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006510 bool isError = false;
6511 if ((LHSIsNull && lType->isIntegerType()) ||
6512 (RHSIsNull && rType->isIntegerType())) {
6513 if (isRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006514 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_and_zero;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006515 } else if (isRelational && !getLangOptions().CPlusPlus)
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006516 DiagID = diag::ext_typecheck_ordered_comparison_of_pointer_integer;
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006517 else if (getLangOptions().CPlusPlus) {
6518 DiagID = diag::err_typecheck_comparison_of_pointer_integer;
6519 isError = true;
6520 } else
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006521 DiagID = diag::ext_typecheck_comparison_of_pointer_integer;
Mike Stump1eb44332009-09-09 15:08:12 +00006522
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006523 if (DiagID) {
Chris Lattner6365e3e2009-08-22 18:58:31 +00006524 Diag(Loc, DiagID)
Chris Lattner149f1382009-06-30 06:24:05 +00006525 << lType << rType << lex->getSourceRange() << rex->getSourceRange();
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006526 if (isError)
6527 return QualType();
Chris Lattner6365e3e2009-08-22 18:58:31 +00006528 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006529
6530 if (lType->isIntegerType())
John McCall404cd162010-11-13 01:35:44 +00006531 ImpCastExprToType(lex, rType,
6532 LHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Chris Lattner06c0f5b2009-08-23 00:03:44 +00006533 else
John McCall404cd162010-11-13 01:35:44 +00006534 ImpCastExprToType(rex, lType,
6535 RHSIsNull ? CK_NullToPointer : CK_IntegralToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006536 return ResultTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006537 }
Douglas Gregor6e5122c2010-06-15 21:38:40 +00006538
Steve Naroff39218df2008-09-04 16:56:14 +00006539 // Handle block pointers.
Mike Stumpaf199f32009-05-07 18:43:07 +00006540 if (!isRelational && RHSIsNull
6541 && lType->isBlockPointerType() && rType->isIntegerType()) {
John McCall404cd162010-11-13 01:35:44 +00006542 ImpCastExprToType(rex, lType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006543 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00006544 }
Mike Stumpaf199f32009-05-07 18:43:07 +00006545 if (!isRelational && LHSIsNull
6546 && lType->isIntegerType() && rType->isBlockPointerType()) {
John McCall404cd162010-11-13 01:35:44 +00006547 ImpCastExprToType(lex, rType, CK_NullToPointer);
Douglas Gregor447b69e2008-11-19 03:25:36 +00006548 return ResultTy;
Steve Naroff39218df2008-09-04 16:56:14 +00006549 }
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006550 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00006551}
6552
Nate Begemanbe2341d2008-07-14 18:02:46 +00006553/// CheckVectorCompareOperands - vector comparisons are a clang extension that
Mike Stumpeed9cac2009-02-19 03:04:26 +00006554/// operates on extended vector types. Instead of producing an IntTy result,
Nate Begemanbe2341d2008-07-14 18:02:46 +00006555/// like a scalar comparison, a vector comparison produces a vector of integer
6556/// types.
6557QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex,
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006558 SourceLocation Loc,
Nate Begemanbe2341d2008-07-14 18:02:46 +00006559 bool isRelational) {
6560 // Check to make sure we're operating on vectors of the same type and width,
6561 // Allowing one side to be a scalar of element type.
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006562 QualType vType = CheckVectorOperands(Loc, lex, rex);
Nate Begemanbe2341d2008-07-14 18:02:46 +00006563 if (vType.isNull())
6564 return vType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006565
Anton Yartsevaa4fe052010-11-18 03:19:30 +00006566 // If AltiVec, the comparison results in a numeric type, i.e.
6567 // bool for C++, int for C
6568 if (getLangOptions().AltiVec)
6569 return (getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy);
6570
Nate Begemanbe2341d2008-07-14 18:02:46 +00006571 QualType lType = lex->getType();
6572 QualType rType = rex->getType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006573
Nate Begemanbe2341d2008-07-14 18:02:46 +00006574 // For non-floating point types, check for self-comparisons of the form
6575 // x == x, x != x, x < x, etc. These always evaluate to a constant, and
6576 // often indicate logic errors in the program.
Douglas Gregor8eee1192010-06-22 22:12:46 +00006577 if (!lType->hasFloatingRepresentation()) {
Nate Begemanbe2341d2008-07-14 18:02:46 +00006578 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens()))
6579 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens()))
6580 if (DRL->getDecl() == DRR->getDecl())
Douglas Gregord64fdd02010-06-08 19:50:34 +00006581 DiagRuntimeBehavior(Loc,
6582 PDiag(diag::warn_comparison_always)
6583 << 0 // self-
6584 << 2 // "a constant"
6585 );
Nate Begemanbe2341d2008-07-14 18:02:46 +00006586 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006587
Nate Begemanbe2341d2008-07-14 18:02:46 +00006588 // Check for comparisons of floating point operands using != and ==.
Douglas Gregor8eee1192010-06-22 22:12:46 +00006589 if (!isRelational && lType->hasFloatingRepresentation()) {
6590 assert (rType->hasFloatingRepresentation());
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006591 CheckFloatComparison(Loc,lex,rex);
Nate Begemanbe2341d2008-07-14 18:02:46 +00006592 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006593
Nate Begemanbe2341d2008-07-14 18:02:46 +00006594 // Return the type for the comparison, which is the same as vector type for
6595 // integer vectors, or an integer type of identical size and number of
6596 // elements for floating point vectors.
Douglas Gregorf6094622010-07-23 15:58:24 +00006597 if (lType->hasIntegerRepresentation())
Nate Begemanbe2341d2008-07-14 18:02:46 +00006598 return lType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006599
John McCall183700f2009-09-21 23:43:11 +00006600 const VectorType *VTy = lType->getAs<VectorType>();
Nate Begemanbe2341d2008-07-14 18:02:46 +00006601 unsigned TypeSize = Context.getTypeSize(VTy->getElementType());
Nate Begeman59b5da62009-01-18 03:20:47 +00006602 if (TypeSize == Context.getTypeSize(Context.IntTy))
Nate Begemanbe2341d2008-07-14 18:02:46 +00006603 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements());
Chris Lattnerd013aa12009-03-31 07:46:52 +00006604 if (TypeSize == Context.getTypeSize(Context.LongTy))
Nate Begeman59b5da62009-01-18 03:20:47 +00006605 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements());
6606
Mike Stumpeed9cac2009-02-19 03:04:26 +00006607 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) &&
Nate Begeman59b5da62009-01-18 03:20:47 +00006608 "Unhandled vector element size in vector compare");
Nate Begemanbe2341d2008-07-14 18:02:46 +00006609 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements());
6610}
6611
Reid Spencer5f016e22007-07-11 17:01:13 +00006612inline QualType Sema::CheckBitwiseOperands(
Mike Stump1eb44332009-09-09 15:08:12 +00006613 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) {
Douglas Gregorf6094622010-07-23 15:58:24 +00006614 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) {
6615 if (lex->getType()->hasIntegerRepresentation() &&
6616 rex->getType()->hasIntegerRepresentation())
6617 return CheckVectorOperands(Loc, lex, rex);
6618
6619 return InvalidOperands(Loc, lex, rex);
6620 }
Steve Naroff90045e82007-07-13 23:32:42 +00006621
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00006622 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006623
Douglas Gregor1274ccd2010-10-08 23:50:27 +00006624 if (lex->getType()->isIntegralOrUnscopedEnumerationType() &&
6625 rex->getType()->isIntegralOrUnscopedEnumerationType())
Steve Naroff9f5fa9b2007-08-24 19:07:16 +00006626 return compType;
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006627 return InvalidOperands(Loc, lex, rex);
Reid Spencer5f016e22007-07-11 17:01:13 +00006628}
6629
6630inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14]
Chris Lattner90a8f272010-07-13 19:41:32 +00006631 Expr *&lex, Expr *&rex, SourceLocation Loc, unsigned Opc) {
6632
6633 // Diagnose cases where the user write a logical and/or but probably meant a
6634 // bitwise one. We do this when the LHS is a non-bool integer and the RHS
6635 // is a constant.
6636 if (lex->getType()->isIntegerType() && !lex->getType()->isBooleanType() &&
Eli Friedman787b0942010-07-27 19:14:53 +00006637 rex->getType()->isIntegerType() && !rex->isValueDependent() &&
Chris Lattner23ef3e42010-07-15 00:26:43 +00006638 // Don't warn in macros.
Chris Lattnerb7690b42010-07-24 01:10:11 +00006639 !Loc.isMacroID()) {
6640 // If the RHS can be constant folded, and if it constant folds to something
6641 // that isn't 0 or 1 (which indicate a potential logical operation that
6642 // happened to fold to true/false) then warn.
6643 Expr::EvalResult Result;
6644 if (rex->Evaluate(Result, Context) && !Result.HasSideEffects &&
6645 Result.Val.getInt() != 0 && Result.Val.getInt() != 1) {
6646 Diag(Loc, diag::warn_logical_instead_of_bitwise)
6647 << rex->getSourceRange()
John McCall2de56d12010-08-25 11:45:40 +00006648 << (Opc == BO_LAnd ? "&&" : "||")
6649 << (Opc == BO_LAnd ? "&" : "|");
Chris Lattnerb7690b42010-07-24 01:10:11 +00006650 }
6651 }
Chris Lattner90a8f272010-07-13 19:41:32 +00006652
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006653 if (!Context.getLangOptions().CPlusPlus) {
6654 UsualUnaryConversions(lex);
6655 UsualUnaryConversions(rex);
Mike Stumpeed9cac2009-02-19 03:04:26 +00006656
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006657 if (!lex->getType()->isScalarType() || !rex->getType()->isScalarType())
6658 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006659
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006660 return Context.IntTy;
Anders Carlsson04905012009-10-16 01:44:21 +00006661 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006662
John McCall75f7c0f2010-06-04 00:29:51 +00006663 // The following is safe because we only use this method for
6664 // non-overloadable operands.
6665
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006666 // C++ [expr.log.and]p1
6667 // C++ [expr.log.or]p1
John McCall75f7c0f2010-06-04 00:29:51 +00006668 // The operands are both contextually converted to type bool.
6669 if (PerformContextuallyConvertToBool(lex) ||
6670 PerformContextuallyConvertToBool(rex))
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006671 return InvalidOperands(Loc, lex, rex);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00006672
Anders Carlssona4c98cd2009-11-23 21:47:44 +00006673 // C++ [expr.log.and]p2
6674 // C++ [expr.log.or]p2
6675 // The result is a bool.
6676 return Context.BoolTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00006677}
6678
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00006679/// IsReadonlyProperty - Verify that otherwise a valid l-value expression
6680/// is a read-only property; return true if so. A readonly property expression
6681/// depends on various declarations and thus must be treated specially.
6682///
Mike Stump1eb44332009-09-09 15:08:12 +00006683static bool IsReadonlyProperty(Expr *E, Sema &S) {
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00006684 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) {
6685 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E);
6686 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) {
Fariborz Jahanian8ac2d442010-10-14 16:04:05 +00006687 QualType BaseType = PropExpr->isSuperReceiver() ?
6688 PropExpr->getSuperType() :
6689 PropExpr->getBase()->getType();
6690
Mike Stump1eb44332009-09-09 15:08:12 +00006691 if (const ObjCObjectPointerType *OPT =
Steve Naroff14108da2009-07-10 23:34:53 +00006692 BaseType->getAsObjCInterfacePointerType())
6693 if (ObjCInterfaceDecl *IFace = OPT->getInterfaceDecl())
6694 if (S.isPropertyReadonly(PDecl, IFace))
6695 return true;
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00006696 }
6697 }
6698 return false;
6699}
6700
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006701/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not,
6702/// emit an error and return true. If so, return false.
6703static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) {
Daniel Dunbar44e35f72009-04-15 00:08:05 +00006704 SourceLocation OrigLoc = Loc;
Mike Stump1eb44332009-09-09 15:08:12 +00006705 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context,
Daniel Dunbar44e35f72009-04-15 00:08:05 +00006706 &Loc);
Fariborz Jahaniand1fa6442009-01-12 19:55:42 +00006707 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S))
6708 IsLV = Expr::MLV_ReadonlyProperty;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006709 if (IsLV == Expr::MLV_Valid)
6710 return false;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006711
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006712 unsigned Diag = 0;
6713 bool NeedType = false;
6714 switch (IsLV) { // C99 6.5.16p2
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006715 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006716 case Expr::MLV_ArrayType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006717 Diag = diag::err_typecheck_array_not_modifiable_lvalue;
6718 NeedType = true;
6719 break;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006720 case Expr::MLV_NotObjectType:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006721 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue;
6722 NeedType = true;
6723 break;
Chris Lattnerca354fa2008-11-17 19:51:54 +00006724 case Expr::MLV_LValueCast:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006725 Diag = diag::err_typecheck_lvalue_casts_not_supported;
6726 break;
Douglas Gregore873fb72010-02-16 21:39:57 +00006727 case Expr::MLV_Valid:
6728 llvm_unreachable("did not take early return for MLV_Valid");
Chris Lattner5cf216b2008-01-04 18:04:52 +00006729 case Expr::MLV_InvalidExpression:
Douglas Gregore873fb72010-02-16 21:39:57 +00006730 case Expr::MLV_MemberFunction:
6731 case Expr::MLV_ClassTemporary:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006732 Diag = diag::err_typecheck_expression_not_modifiable_lvalue;
6733 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00006734 case Expr::MLV_IncompleteType:
6735 case Expr::MLV_IncompleteVoidType:
Douglas Gregor86447ec2009-03-09 16:13:40 +00006736 return S.RequireCompleteType(Loc, E->getType(),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00006737 S.PDiag(diag::err_typecheck_incomplete_type_not_modifiable_lvalue)
Anders Carlssonb7906612009-08-26 23:45:07 +00006738 << E->getSourceRange());
Chris Lattner5cf216b2008-01-04 18:04:52 +00006739 case Expr::MLV_DuplicateVectorComponents:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006740 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue;
6741 break;
Steve Naroff4f6a7d72008-09-26 14:41:28 +00006742 case Expr::MLV_NotBlockQualified:
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006743 Diag = diag::err_block_decl_ref_not_modifiable_lvalue;
6744 break;
Fariborz Jahanian5daf5702008-11-22 18:39:36 +00006745 case Expr::MLV_ReadonlyProperty:
6746 Diag = diag::error_readonly_property_assignment;
6747 break;
Fariborz Jahanianba8d2d62008-11-22 20:25:50 +00006748 case Expr::MLV_NoSetterProperty:
6749 Diag = diag::error_nosetter_property_assignment;
6750 break;
Fariborz Jahanian2514a302009-12-15 23:59:41 +00006751 case Expr::MLV_SubObjCPropertySetting:
6752 Diag = diag::error_no_subobject_property_setting;
6753 break;
Reid Spencer5f016e22007-07-11 17:01:13 +00006754 }
Steve Naroffd1861fd2007-07-31 12:34:36 +00006755
Daniel Dunbar44e35f72009-04-15 00:08:05 +00006756 SourceRange Assign;
6757 if (Loc != OrigLoc)
6758 Assign = SourceRange(OrigLoc, OrigLoc);
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006759 if (NeedType)
Daniel Dunbar44e35f72009-04-15 00:08:05 +00006760 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006761 else
Mike Stump1eb44332009-09-09 15:08:12 +00006762 S.Diag(Loc, Diag) << E->getSourceRange() << Assign;
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006763 return true;
6764}
6765
6766
6767
6768// C99 6.5.16.1
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006769QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS,
6770 SourceLocation Loc,
6771 QualType CompoundType) {
6772 // Verify that LHS is a modifiable lvalue, and emit error if not.
6773 if (CheckForModifiableLvalue(LHS, Loc, *this))
Chris Lattnerf67bd9f2008-11-18 01:22:49 +00006774 return QualType();
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006775
6776 QualType LHSType = LHS->getType();
6777 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType;
Chris Lattner5cf216b2008-01-04 18:04:52 +00006778 AssignConvertType ConvTy;
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006779 if (CompoundType.isNull()) {
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00006780 QualType LHSTy(LHSType);
Chris Lattner2c156472008-08-21 18:04:13 +00006781 // Simple assignment "x = y".
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00006782 ConvertPropertyAssignment(LHS, RHS, LHSTy);
Fariborz Jahaniane2a901a2010-06-07 22:02:01 +00006783 ConvTy = CheckSingleAssignmentConstraints(LHSTy, RHS);
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00006784 // Special case of NSObject attributes on c-style pointer types.
6785 if (ConvTy == IncompatiblePointer &&
6786 ((Context.isObjCNSObjectType(LHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00006787 RHSType->isObjCObjectPointerType()) ||
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00006788 (Context.isObjCNSObjectType(RHSType) &&
Steve Narofff4954562009-07-16 15:41:00 +00006789 LHSType->isObjCObjectPointerType())))
Fariborz Jahanianfa23c1d2009-01-13 23:34:40 +00006790 ConvTy = Compatible;
Mike Stumpeed9cac2009-02-19 03:04:26 +00006791
John McCallf89e55a2010-11-18 06:31:45 +00006792 if (ConvTy == Compatible &&
6793 getLangOptions().ObjCNonFragileABI &&
6794 LHSType->isObjCObjectType())
6795 Diag(Loc, diag::err_assignment_requires_nonfragile_object)
6796 << LHSType;
6797
Chris Lattner2c156472008-08-21 18:04:13 +00006798 // If the RHS is a unary plus or minus, check to see if they = and + are
6799 // right next to each other. If so, the user may have typo'd "x =+ 4"
6800 // instead of "x += 4".
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006801 Expr *RHSCheck = RHS;
Chris Lattner2c156472008-08-21 18:04:13 +00006802 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck))
6803 RHSCheck = ICE->getSubExpr();
6804 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) {
John McCall2de56d12010-08-25 11:45:40 +00006805 if ((UO->getOpcode() == UO_Plus ||
6806 UO->getOpcode() == UO_Minus) &&
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006807 Loc.isFileID() && UO->getOperatorLoc().isFileID() &&
Chris Lattner2c156472008-08-21 18:04:13 +00006808 // Only if the two operators are exactly adjacent.
Chris Lattner399bd1b2009-03-08 06:51:10 +00006809 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() &&
6810 // And there is a space or other character before the subexpr of the
6811 // unary +/-. We don't want to warn on "x=-1".
Chris Lattner3e872092009-03-09 07:11:10 +00006812 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() &&
6813 UO->getSubExpr()->getLocStart().isFileID()) {
Chris Lattnerd3a94e22008-11-20 06:06:08 +00006814 Diag(Loc, diag::warn_not_compound_assign)
John McCall2de56d12010-08-25 11:45:40 +00006815 << (UO->getOpcode() == UO_Plus ? "+" : "-")
Chris Lattnerd3a94e22008-11-20 06:06:08 +00006816 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc());
Chris Lattner399bd1b2009-03-08 06:51:10 +00006817 }
Chris Lattner2c156472008-08-21 18:04:13 +00006818 }
6819 } else {
6820 // Compound assignment "x += y"
John McCall1c23e912010-11-16 02:32:08 +00006821 ConvTy = CheckAssignmentConstraints(LHSType, RHSType);
Chris Lattner2c156472008-08-21 18:04:13 +00006822 }
Chris Lattner5cf216b2008-01-04 18:04:52 +00006823
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006824 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType,
Douglas Gregor68647482009-12-16 03:45:30 +00006825 RHS, AA_Assigning))
Chris Lattner5cf216b2008-01-04 18:04:52 +00006826 return QualType();
Mike Stumpeed9cac2009-02-19 03:04:26 +00006827
Chris Lattner8b5dec32010-07-07 06:14:23 +00006828
6829 // Check to see if the destination operand is a dereferenced null pointer. If
6830 // so, and if not volatile-qualified, this is undefined behavior that the
6831 // optimizer will delete, so warn about it. People sometimes try to use this
6832 // to get a deterministic trap and are surprised by clang's behavior. This
6833 // only handles the pattern "*null = whatever", which is a very syntactic
6834 // check.
6835 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(LHS->IgnoreParenCasts()))
John McCall2de56d12010-08-25 11:45:40 +00006836 if (UO->getOpcode() == UO_Deref &&
Chris Lattner8b5dec32010-07-07 06:14:23 +00006837 UO->getSubExpr()->IgnoreParenCasts()->
6838 isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull) &&
6839 !UO->getType().isVolatileQualified()) {
6840 Diag(UO->getOperatorLoc(), diag::warn_indirection_through_null)
6841 << UO->getSubExpr()->getSourceRange();
6842 Diag(UO->getOperatorLoc(), diag::note_indirection_through_null);
6843 }
6844
Reid Spencer5f016e22007-07-11 17:01:13 +00006845 // C99 6.5.16p3: The type of an assignment expression is the type of the
6846 // left operand unless the left operand has qualified type, in which case
Mike Stumpeed9cac2009-02-19 03:04:26 +00006847 // it is the unqualified version of the type of the left operand.
Reid Spencer5f016e22007-07-11 17:01:13 +00006848 // C99 6.5.16.1p2: In simple assignment, the value of the right operand
6849 // is converted to the type of the assignment expression (above).
Chris Lattner73d0d4f2007-08-30 17:45:32 +00006850 // C++ 5.17p1: the type of the assignment expression is that of its left
Douglas Gregor2d833e32009-05-02 00:36:19 +00006851 // operand.
John McCall2bf6f492010-10-12 02:19:57 +00006852 return (getLangOptions().CPlusPlus
6853 ? LHSType : LHSType.getUnqualifiedType());
Reid Spencer5f016e22007-07-11 17:01:13 +00006854}
6855
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006856// C99 6.5.17
John McCall09431682010-11-18 19:01:18 +00006857static QualType CheckCommaOperands(Sema &S, Expr *LHS, Expr *&RHS,
6858 SourceLocation Loc) {
6859 S.DiagnoseUnusedExprResult(LHS);
Argyrios Kyrtzidis25973452010-06-30 10:53:14 +00006860
John McCall09431682010-11-18 19:01:18 +00006861 ExprResult LHSResult = S.CheckPlaceholderExpr(LHS, Loc);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00006862 if (LHSResult.isInvalid())
6863 return QualType();
6864
John McCall09431682010-11-18 19:01:18 +00006865 ExprResult RHSResult = S.CheckPlaceholderExpr(RHS, Loc);
Douglas Gregor7ad5d422010-11-09 21:07:58 +00006866 if (RHSResult.isInvalid())
6867 return QualType();
6868 RHS = RHSResult.take();
6869
John McCallcf2e5062010-10-12 07:14:40 +00006870 // C's comma performs lvalue conversion (C99 6.3.2.1) on both its
6871 // operands, but not unary promotions.
6872 // C++'s comma does not do any conversions at all (C++ [expr.comma]p1).
John McCall09431682010-11-18 19:01:18 +00006873 if (!S.getLangOptions().CPlusPlus) {
6874 S.DefaultFunctionArrayLvalueConversion(LHS);
John McCallcf2e5062010-10-12 07:14:40 +00006875 if (!LHS->getType()->isVoidType())
John McCall09431682010-11-18 19:01:18 +00006876 S.RequireCompleteType(Loc, LHS->getType(), diag::err_incomplete_type);
Eli Friedmanb1d796d2009-03-23 00:24:07 +00006877
John McCall09431682010-11-18 19:01:18 +00006878 S.DefaultFunctionArrayLvalueConversion(RHS);
John McCallcf2e5062010-10-12 07:14:40 +00006879 if (!RHS->getType()->isVoidType())
John McCall09431682010-11-18 19:01:18 +00006880 S.RequireCompleteType(Loc, RHS->getType(), diag::err_incomplete_type);
John McCallcf2e5062010-10-12 07:14:40 +00006881 }
Eli Friedmanb1d796d2009-03-23 00:24:07 +00006882
Chris Lattner29a1cfb2008-11-18 01:30:42 +00006883 return RHS->getType();
Reid Spencer5f016e22007-07-11 17:01:13 +00006884}
6885
Steve Naroff49b45262007-07-13 16:58:59 +00006886/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine
6887/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions.
John McCall09431682010-11-18 19:01:18 +00006888static QualType CheckIncrementDecrementOperand(Sema &S, Expr *Op,
6889 ExprValueKind &VK,
6890 SourceLocation OpLoc,
6891 bool isInc, bool isPrefix) {
Sebastian Redl28507842009-02-26 14:39:58 +00006892 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00006893 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00006894
Chris Lattner3528d352008-11-21 07:05:48 +00006895 QualType ResType = Op->getType();
6896 assert(!ResType.isNull() && "no type for increment/decrement expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00006897
John McCall09431682010-11-18 19:01:18 +00006898 if (S.getLangOptions().CPlusPlus && ResType->isBooleanType()) {
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00006899 // Decrement of bool is not allowed.
6900 if (!isInc) {
John McCall09431682010-11-18 19:01:18 +00006901 S.Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00006902 return QualType();
6903 }
6904 // Increment of bool sets it to true, but is deprecated.
John McCall09431682010-11-18 19:01:18 +00006905 S.Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange();
Sebastian Redle6d5a4a2008-12-20 09:35:34 +00006906 } else if (ResType->isRealType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00006907 // OK!
Steve Naroff58f9f2c2009-07-14 18:25:06 +00006908 } else if (ResType->isAnyPointerType()) {
6909 QualType PointeeTy = ResType->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00006910
Chris Lattner3528d352008-11-21 07:05:48 +00006911 // C99 6.5.2.4p2, 6.5.6p2
Steve Naroff14108da2009-07-10 23:34:53 +00006912 if (PointeeTy->isVoidType()) {
John McCall09431682010-11-18 19:01:18 +00006913 if (S.getLangOptions().CPlusPlus) {
6914 S.Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type)
Douglas Gregorc983b862009-01-23 00:36:41 +00006915 << Op->getSourceRange();
6916 return QualType();
6917 }
6918
6919 // Pointer to void is a GNU extension in C.
John McCall09431682010-11-18 19:01:18 +00006920 S.Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange();
Steve Naroff14108da2009-07-10 23:34:53 +00006921 } else if (PointeeTy->isFunctionType()) {
John McCall09431682010-11-18 19:01:18 +00006922 if (S.getLangOptions().CPlusPlus) {
6923 S.Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type)
Douglas Gregorc983b862009-01-23 00:36:41 +00006924 << Op->getType() << Op->getSourceRange();
6925 return QualType();
6926 }
6927
John McCall09431682010-11-18 19:01:18 +00006928 S.Diag(OpLoc, diag::ext_gnu_ptr_func_arith)
Chris Lattnerd1625842008-11-24 06:25:27 +00006929 << ResType << Op->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00006930 } else if (S.RequireCompleteType(OpLoc, PointeeTy,
6931 S.PDiag(diag::err_typecheck_arithmetic_incomplete_type)
Mike Stump1eb44332009-09-09 15:08:12 +00006932 << Op->getSourceRange()
Anders Carlssond497ba72009-08-26 22:59:12 +00006933 << ResType))
Douglas Gregor4ec339f2009-01-19 19:26:10 +00006934 return QualType();
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00006935 // Diagnose bad cases where we step over interface counts.
John McCall09431682010-11-18 19:01:18 +00006936 else if (PointeeTy->isObjCObjectType() && S.LangOpts.ObjCNonFragileABI) {
6937 S.Diag(OpLoc, diag::err_arithmetic_nonfragile_interface)
Fariborz Jahanian9f8a04f2009-07-16 17:59:14 +00006938 << PointeeTy << Op->getSourceRange();
6939 return QualType();
6940 }
Eli Friedman5b088a12010-01-03 00:20:48 +00006941 } else if (ResType->isAnyComplexType()) {
Chris Lattner3528d352008-11-21 07:05:48 +00006942 // C99 does not support ++/-- on complex types, we allow as an extension.
John McCall09431682010-11-18 19:01:18 +00006943 S.Diag(OpLoc, diag::ext_integer_increment_complex)
Chris Lattnerd1625842008-11-24 06:25:27 +00006944 << ResType << Op->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00006945 } else if (ResType->isPlaceholderType()) {
John McCall09431682010-11-18 19:01:18 +00006946 ExprResult PR = S.CheckPlaceholderExpr(Op, OpLoc);
John McCall2cd11fe2010-10-12 02:09:17 +00006947 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00006948 return CheckIncrementDecrementOperand(S, PR.take(), VK, OpLoc,
6949 isInc, isPrefix);
Chris Lattner3528d352008-11-21 07:05:48 +00006950 } else {
John McCall09431682010-11-18 19:01:18 +00006951 S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
Douglas Gregor5cc07df2009-12-15 16:44:32 +00006952 << ResType << int(isInc) << Op->getSourceRange();
Chris Lattner3528d352008-11-21 07:05:48 +00006953 return QualType();
Reid Spencer5f016e22007-07-11 17:01:13 +00006954 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00006955 // At this point, we know we have a real, complex or pointer type.
Steve Naroffdd10e022007-08-23 21:37:33 +00006956 // Now make sure the operand is a modifiable lvalue.
John McCall09431682010-11-18 19:01:18 +00006957 if (CheckForModifiableLvalue(Op, OpLoc, S))
Reid Spencer5f016e22007-07-11 17:01:13 +00006958 return QualType();
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00006959 // In C++, a prefix increment is the same type as the operand. Otherwise
6960 // (in C or with postfix), the increment is the unqualified type of the
6961 // operand.
John McCall09431682010-11-18 19:01:18 +00006962 if (isPrefix && S.getLangOptions().CPlusPlus) {
6963 VK = VK_LValue;
6964 return ResType;
6965 } else {
6966 VK = VK_RValue;
6967 return ResType.getUnqualifiedType();
6968 }
Reid Spencer5f016e22007-07-11 17:01:13 +00006969}
6970
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00006971void Sema::ConvertPropertyAssignment(Expr *LHS, Expr *&RHS, QualType& LHSTy) {
6972 bool copyInit = false;
6973 if (const ObjCImplicitSetterGetterRefExpr *OISGE =
6974 dyn_cast<ObjCImplicitSetterGetterRefExpr>(LHS)) {
6975 // If using property-dot syntax notation for assignment, and there is a
6976 // setter, RHS expression is being passed to the setter argument. So,
6977 // type conversion (and comparison) is RHS to setter's argument type.
6978 if (const ObjCMethodDecl *SetterMD = OISGE->getSetterMethod()) {
6979 ObjCMethodDecl::param_iterator P = SetterMD->param_begin();
6980 LHSTy = (*P)->getType();
6981 }
6982 copyInit = (getLangOptions().CPlusPlus && LHSTy->isRecordType());
6983 }
6984 else
6985 copyInit = (getLangOptions().CPlusPlus && isa<ObjCPropertyRefExpr>(LHS) &&
6986 LHSTy->isRecordType());
6987 if (copyInit) {
6988 InitializedEntity Entity =
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00006989 InitializedEntity::InitializeParameter(Context, LHSTy);
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00006990 Expr *Arg = RHS;
6991 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(),
6992 Owned(Arg));
6993 if (!ArgE.isInvalid())
Fariborz Jahanian745da3a2010-09-24 17:30:16 +00006994 RHS = ArgE.takeAs<Expr>();
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00006995 }
6996}
6997
6998
Anders Carlsson369dee42008-02-01 07:15:58 +00006999/// getPrimaryDecl - Helper function for CheckAddressOfOperand().
Reid Spencer5f016e22007-07-11 17:01:13 +00007000/// This routine allows us to typecheck complex/recursive expressions
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007001/// where the declaration is needed for type checking. We only need to
7002/// handle cases when the expression references a function designator
7003/// or is an lvalue. Here are some examples:
7004/// - &(x) => x
7005/// - &*****f => f for f a function designator.
7006/// - &s.xx => s
7007/// - &s.zz[1].yy -> s, if zz is an array
7008/// - *(x + 1) -> x, if x is an array
7009/// - &"123"[2] -> 0
7010/// - & __real__ x -> x
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00007011static NamedDecl *getPrimaryDecl(Expr *E) {
Chris Lattnerf0467b32008-04-02 04:24:33 +00007012 switch (E->getStmtClass()) {
Reid Spencer5f016e22007-07-11 17:01:13 +00007013 case Stmt::DeclRefExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00007014 return cast<DeclRefExpr>(E)->getDecl();
Reid Spencer5f016e22007-07-11 17:01:13 +00007015 case Stmt::MemberExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00007016 // If this is an arrow operator, the address is an offset from
7017 // the base's value, so the object the base refers to is
7018 // irrelevant.
Chris Lattnerf0467b32008-04-02 04:24:33 +00007019 if (cast<MemberExpr>(E)->isArrow())
Chris Lattnerf82228f2007-11-16 17:46:48 +00007020 return 0;
Eli Friedman23d58ce2009-04-20 08:23:18 +00007021 // Otherwise, the expression refers to a part of the base
Chris Lattnerf0467b32008-04-02 04:24:33 +00007022 return getPrimaryDecl(cast<MemberExpr>(E)->getBase());
Anders Carlsson369dee42008-02-01 07:15:58 +00007023 case Stmt::ArraySubscriptExprClass: {
Mike Stump390b4cc2009-05-16 07:39:55 +00007024 // FIXME: This code shouldn't be necessary! We should catch the implicit
7025 // promotion of register arrays earlier.
Eli Friedman23d58ce2009-04-20 08:23:18 +00007026 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase();
7027 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) {
7028 if (ICE->getSubExpr()->getType()->isArrayType())
7029 return getPrimaryDecl(ICE->getSubExpr());
7030 }
7031 return 0;
Anders Carlsson369dee42008-02-01 07:15:58 +00007032 }
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007033 case Stmt::UnaryOperatorClass: {
7034 UnaryOperator *UO = cast<UnaryOperator>(E);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007035
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007036 switch(UO->getOpcode()) {
John McCall2de56d12010-08-25 11:45:40 +00007037 case UO_Real:
7038 case UO_Imag:
7039 case UO_Extension:
Daniel Dunbar1e76ce62008-08-04 20:02:37 +00007040 return getPrimaryDecl(UO->getSubExpr());
7041 default:
7042 return 0;
7043 }
7044 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007045 case Stmt::ParenExprClass:
Chris Lattnerf0467b32008-04-02 04:24:33 +00007046 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr());
Chris Lattnerf82228f2007-11-16 17:46:48 +00007047 case Stmt::ImplicitCastExprClass:
Eli Friedman23d58ce2009-04-20 08:23:18 +00007048 // If the result of an implicit cast is an l-value, we care about
7049 // the sub-expression; otherwise, the result here doesn't matter.
Chris Lattnerf0467b32008-04-02 04:24:33 +00007050 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr());
Reid Spencer5f016e22007-07-11 17:01:13 +00007051 default:
7052 return 0;
7053 }
7054}
7055
7056/// CheckAddressOfOperand - The operand of & must be either a function
Mike Stumpeed9cac2009-02-19 03:04:26 +00007057/// designator or an lvalue designating an object. If it is an lvalue, the
Reid Spencer5f016e22007-07-11 17:01:13 +00007058/// object cannot be declared with storage class register or be a bit field.
Mike Stumpeed9cac2009-02-19 03:04:26 +00007059/// Note: The usual conversions are *not* applied to the operand of the &
Reid Spencer5f016e22007-07-11 17:01:13 +00007060/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
Mike Stumpeed9cac2009-02-19 03:04:26 +00007061/// In C++, the operand might be an overloaded function name, in which case
Douglas Gregor904eed32008-11-10 20:40:00 +00007062/// we allow the '&' but retain the overloaded-function type.
John McCall09431682010-11-18 19:01:18 +00007063static QualType CheckAddressOfOperand(Sema &S, Expr *OrigOp,
7064 SourceLocation OpLoc) {
John McCall9c72c602010-08-27 09:08:28 +00007065 if (OrigOp->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00007066 return S.Context.DependentTy;
7067 if (OrigOp->getType() == S.Context.OverloadTy)
7068 return S.Context.OverloadTy;
John McCall9c72c602010-08-27 09:08:28 +00007069
John McCall09431682010-11-18 19:01:18 +00007070 ExprResult PR = S.CheckPlaceholderExpr(OrigOp, OpLoc);
John McCall2cd11fe2010-10-12 02:09:17 +00007071 if (PR.isInvalid()) return QualType();
7072 OrigOp = PR.take();
7073
John McCall9c72c602010-08-27 09:08:28 +00007074 // Make sure to ignore parentheses in subsequent checks
7075 Expr *op = OrigOp->IgnoreParens();
Douglas Gregor9103bb22008-12-17 22:52:20 +00007076
John McCall09431682010-11-18 19:01:18 +00007077 if (S.getLangOptions().C99) {
Steve Naroff08f19672008-01-13 17:10:08 +00007078 // Implement C99-only parts of addressof rules.
7079 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
John McCall2de56d12010-08-25 11:45:40 +00007080 if (uOp->getOpcode() == UO_Deref)
Steve Naroff08f19672008-01-13 17:10:08 +00007081 // Per C99 6.5.3.2, the address of a deref always returns a valid result
7082 // (assuming the deref expression is valid).
7083 return uOp->getSubExpr()->getType();
7084 }
7085 // Technically, there should be a check for array subscript
7086 // expressions here, but the result of one is always an lvalue anyway.
7087 }
Douglas Gregor8e9bebd2008-10-21 16:13:35 +00007088 NamedDecl *dcl = getPrimaryDecl(op);
John McCall7eb0a9e2010-11-24 05:12:34 +00007089 Expr::LValueClassification lval = op->ClassifyLValue(S.Context);
Nuno Lopes6b6609f2008-12-16 22:59:47 +00007090
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007091 if (lval == Expr::LV_ClassTemporary) {
John McCall09431682010-11-18 19:01:18 +00007092 bool sfinae = S.isSFINAEContext();
7093 S.Diag(OpLoc, sfinae ? diag::err_typecheck_addrof_class_temporary
7094 : diag::ext_typecheck_addrof_class_temporary)
Douglas Gregore873fb72010-02-16 21:39:57 +00007095 << op->getType() << op->getSourceRange();
John McCall09431682010-11-18 19:01:18 +00007096 if (sfinae)
Douglas Gregore873fb72010-02-16 21:39:57 +00007097 return QualType();
John McCall9c72c602010-08-27 09:08:28 +00007098 } else if (isa<ObjCSelectorExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00007099 return S.Context.getPointerType(op->getType());
John McCall9c72c602010-08-27 09:08:28 +00007100 } else if (lval == Expr::LV_MemberFunction) {
7101 // If it's an instance method, make a member pointer.
7102 // The expression must have exactly the form &A::foo.
7103
7104 // If the underlying expression isn't a decl ref, give up.
7105 if (!isa<DeclRefExpr>(op)) {
John McCall09431682010-11-18 19:01:18 +00007106 S.Diag(OpLoc, diag::err_invalid_form_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00007107 << OrigOp->getSourceRange();
7108 return QualType();
7109 }
7110 DeclRefExpr *DRE = cast<DeclRefExpr>(op);
7111 CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
7112
7113 // The id-expression was parenthesized.
7114 if (OrigOp != DRE) {
John McCall09431682010-11-18 19:01:18 +00007115 S.Diag(OpLoc, diag::err_parens_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00007116 << OrigOp->getSourceRange();
7117
7118 // The method was named without a qualifier.
7119 } else if (!DRE->getQualifier()) {
John McCall09431682010-11-18 19:01:18 +00007120 S.Diag(OpLoc, diag::err_unqualified_pointer_member_function)
John McCall9c72c602010-08-27 09:08:28 +00007121 << op->getSourceRange();
7122 }
7123
John McCall09431682010-11-18 19:01:18 +00007124 return S.Context.getMemberPointerType(op->getType(),
7125 S.Context.getTypeDeclType(MD->getParent()).getTypePtr());
John McCall9c72c602010-08-27 09:08:28 +00007126 } else if (lval != Expr::LV_Valid && lval != Expr::LV_IncompleteVoidType) {
Eli Friedman441cf102009-05-16 23:27:50 +00007127 // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00007128 // The operand must be either an l-value or a function designator
Eli Friedman441cf102009-05-16 23:27:50 +00007129 if (!op->getType()->isFunctionType()) {
Chris Lattnerf82228f2007-11-16 17:46:48 +00007130 // FIXME: emit more specific diag...
John McCall09431682010-11-18 19:01:18 +00007131 S.Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof)
Chris Lattnerdcd5ef12008-11-19 05:27:50 +00007132 << op->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00007133 return QualType();
7134 }
John McCall7eb0a9e2010-11-24 05:12:34 +00007135 } else if (op->getObjectKind() == OK_BitField) { // C99 6.5.3.2p1
Eli Friedman23d58ce2009-04-20 08:23:18 +00007136 // The operand cannot be a bit-field
John McCall09431682010-11-18 19:01:18 +00007137 S.Diag(OpLoc, diag::err_typecheck_address_of)
Eli Friedman23d58ce2009-04-20 08:23:18 +00007138 << "bit-field" << op->getSourceRange();
Douglas Gregor86f19402008-12-20 23:49:58 +00007139 return QualType();
John McCall7eb0a9e2010-11-24 05:12:34 +00007140 } else if (op->getObjectKind() == OK_VectorComponent) {
Eli Friedman23d58ce2009-04-20 08:23:18 +00007141 // The operand cannot be an element of a vector
John McCall09431682010-11-18 19:01:18 +00007142 S.Diag(OpLoc, diag::err_typecheck_address_of)
Nate Begemanb104b1f2009-02-15 22:45:20 +00007143 << "vector element" << op->getSourceRange();
Steve Naroffbcb2b612008-02-29 23:30:25 +00007144 return QualType();
John McCall7eb0a9e2010-11-24 05:12:34 +00007145 } else if (op->getObjectKind() == OK_ObjCProperty) {
Fariborz Jahanian0337f212009-07-07 18:50:52 +00007146 // cannot take address of a property expression.
John McCall09431682010-11-18 19:01:18 +00007147 S.Diag(OpLoc, diag::err_typecheck_address_of)
Fariborz Jahanian0337f212009-07-07 18:50:52 +00007148 << "property expression" << op->getSourceRange();
7149 return QualType();
Steve Naroffbcb2b612008-02-29 23:30:25 +00007150 } else if (dcl) { // C99 6.5.3.2p1
Mike Stumpeed9cac2009-02-19 03:04:26 +00007151 // We have an lvalue with a decl. Make sure the decl is not declared
Reid Spencer5f016e22007-07-11 17:01:13 +00007152 // with the register storage-class specifier.
7153 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) {
Fariborz Jahanian4020f872010-08-24 22:21:48 +00007154 // in C++ it is not error to take address of a register
7155 // variable (c++03 7.1.1P3)
John McCalld931b082010-08-26 03:08:43 +00007156 if (vd->getStorageClass() == SC_Register &&
John McCall09431682010-11-18 19:01:18 +00007157 !S.getLangOptions().CPlusPlus) {
7158 S.Diag(OpLoc, diag::err_typecheck_address_of)
Chris Lattnerd3a94e22008-11-20 06:06:08 +00007159 << "register variable" << op->getSourceRange();
Reid Spencer5f016e22007-07-11 17:01:13 +00007160 return QualType();
7161 }
John McCallba135432009-11-21 08:51:07 +00007162 } else if (isa<FunctionTemplateDecl>(dcl)) {
John McCall09431682010-11-18 19:01:18 +00007163 return S.Context.OverloadTy;
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007164 } else if (FieldDecl *FD = dyn_cast<FieldDecl>(dcl)) {
Douglas Gregor29882052008-12-10 21:26:49 +00007165 // Okay: we can take the address of a field.
Sebastian Redlebc07d52009-02-03 20:19:35 +00007166 // Could be a pointer to member, though, if there is an explicit
7167 // scope qualifier for the class.
Douglas Gregora2813ce2009-10-23 18:54:35 +00007168 if (isa<DeclRefExpr>(op) && cast<DeclRefExpr>(op)->getQualifier()) {
Sebastian Redlebc07d52009-02-03 20:19:35 +00007169 DeclContext *Ctx = dcl->getDeclContext();
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007170 if (Ctx && Ctx->isRecord()) {
7171 if (FD->getType()->isReferenceType()) {
John McCall09431682010-11-18 19:01:18 +00007172 S.Diag(OpLoc,
7173 diag::err_cannot_form_pointer_to_member_of_reference_type)
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007174 << FD->getDeclName() << FD->getType();
7175 return QualType();
7176 }
Mike Stump1eb44332009-09-09 15:08:12 +00007177
John McCall09431682010-11-18 19:01:18 +00007178 return S.Context.getMemberPointerType(op->getType(),
7179 S.Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr());
Anders Carlssonf9e48bd2009-07-08 21:45:58 +00007180 }
Sebastian Redlebc07d52009-02-03 20:19:35 +00007181 }
Anders Carlsson196f7d02009-05-16 21:43:42 +00007182 } else if (!isa<FunctionDecl>(dcl))
Reid Spencer5f016e22007-07-11 17:01:13 +00007183 assert(0 && "Unknown/unexpected decl type");
Reid Spencer5f016e22007-07-11 17:01:13 +00007184 }
Sebastian Redl33b399a2009-02-04 21:23:32 +00007185
Eli Friedman441cf102009-05-16 23:27:50 +00007186 if (lval == Expr::LV_IncompleteVoidType) {
7187 // Taking the address of a void variable is technically illegal, but we
7188 // allow it in cases which are otherwise valid.
7189 // Example: "extern void x; void* y = &x;".
John McCall09431682010-11-18 19:01:18 +00007190 S.Diag(OpLoc, diag::ext_typecheck_addrof_void) << op->getSourceRange();
Eli Friedman441cf102009-05-16 23:27:50 +00007191 }
7192
Reid Spencer5f016e22007-07-11 17:01:13 +00007193 // If the operand has type "type", the result has type "pointer to type".
Douglas Gregor8f70ddb2010-07-29 16:05:45 +00007194 if (op->getType()->isObjCObjectType())
John McCall09431682010-11-18 19:01:18 +00007195 return S.Context.getObjCObjectPointerType(op->getType());
7196 return S.Context.getPointerType(op->getType());
Reid Spencer5f016e22007-07-11 17:01:13 +00007197}
7198
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007199/// CheckIndirectionOperand - Type check unary indirection (prefix '*').
John McCall09431682010-11-18 19:01:18 +00007200static QualType CheckIndirectionOperand(Sema &S, Expr *Op, ExprValueKind &VK,
7201 SourceLocation OpLoc) {
Sebastian Redl28507842009-02-26 14:39:58 +00007202 if (Op->isTypeDependent())
John McCall09431682010-11-18 19:01:18 +00007203 return S.Context.DependentTy;
Sebastian Redl28507842009-02-26 14:39:58 +00007204
John McCall09431682010-11-18 19:01:18 +00007205 S.UsualUnaryConversions(Op);
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007206 QualType OpTy = Op->getType();
7207 QualType Result;
7208
7209 // Note that per both C89 and C99, indirection is always legal, even if OpTy
7210 // is an incomplete type or void. It would be possible to warn about
7211 // dereferencing a void pointer, but it's completely well-defined, and such a
7212 // warning is unlikely to catch any mistakes.
7213 if (const PointerType *PT = OpTy->getAs<PointerType>())
7214 Result = PT->getPointeeType();
7215 else if (const ObjCObjectPointerType *OPT =
7216 OpTy->getAs<ObjCObjectPointerType>())
7217 Result = OPT->getPointeeType();
John McCall2cd11fe2010-10-12 02:09:17 +00007218 else {
John McCall09431682010-11-18 19:01:18 +00007219 ExprResult PR = S.CheckPlaceholderExpr(Op, OpLoc);
John McCall2cd11fe2010-10-12 02:09:17 +00007220 if (PR.isInvalid()) return QualType();
John McCall09431682010-11-18 19:01:18 +00007221 if (PR.take() != Op)
7222 return CheckIndirectionOperand(S, PR.take(), VK, OpLoc);
John McCall2cd11fe2010-10-12 02:09:17 +00007223 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007224
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007225 if (Result.isNull()) {
John McCall09431682010-11-18 19:01:18 +00007226 S.Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer)
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007227 << OpTy << Op->getSourceRange();
7228 return QualType();
7229 }
John McCall09431682010-11-18 19:01:18 +00007230
7231 // Dereferences are usually l-values...
7232 VK = VK_LValue;
7233
7234 // ...except that certain expressions are never l-values in C.
7235 if (!S.getLangOptions().CPlusPlus &&
7236 IsCForbiddenLValueType(S.Context, Result))
7237 VK = VK_RValue;
Chris Lattnerfd79a9d2010-07-05 19:17:26 +00007238
7239 return Result;
Reid Spencer5f016e22007-07-11 17:01:13 +00007240}
7241
John McCall2de56d12010-08-25 11:45:40 +00007242static inline BinaryOperatorKind ConvertTokenKindToBinaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00007243 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00007244 BinaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00007245 switch (Kind) {
7246 default: assert(0 && "Unknown binop!");
John McCall2de56d12010-08-25 11:45:40 +00007247 case tok::periodstar: Opc = BO_PtrMemD; break;
7248 case tok::arrowstar: Opc = BO_PtrMemI; break;
7249 case tok::star: Opc = BO_Mul; break;
7250 case tok::slash: Opc = BO_Div; break;
7251 case tok::percent: Opc = BO_Rem; break;
7252 case tok::plus: Opc = BO_Add; break;
7253 case tok::minus: Opc = BO_Sub; break;
7254 case tok::lessless: Opc = BO_Shl; break;
7255 case tok::greatergreater: Opc = BO_Shr; break;
7256 case tok::lessequal: Opc = BO_LE; break;
7257 case tok::less: Opc = BO_LT; break;
7258 case tok::greaterequal: Opc = BO_GE; break;
7259 case tok::greater: Opc = BO_GT; break;
7260 case tok::exclaimequal: Opc = BO_NE; break;
7261 case tok::equalequal: Opc = BO_EQ; break;
7262 case tok::amp: Opc = BO_And; break;
7263 case tok::caret: Opc = BO_Xor; break;
7264 case tok::pipe: Opc = BO_Or; break;
7265 case tok::ampamp: Opc = BO_LAnd; break;
7266 case tok::pipepipe: Opc = BO_LOr; break;
7267 case tok::equal: Opc = BO_Assign; break;
7268 case tok::starequal: Opc = BO_MulAssign; break;
7269 case tok::slashequal: Opc = BO_DivAssign; break;
7270 case tok::percentequal: Opc = BO_RemAssign; break;
7271 case tok::plusequal: Opc = BO_AddAssign; break;
7272 case tok::minusequal: Opc = BO_SubAssign; break;
7273 case tok::lesslessequal: Opc = BO_ShlAssign; break;
7274 case tok::greatergreaterequal: Opc = BO_ShrAssign; break;
7275 case tok::ampequal: Opc = BO_AndAssign; break;
7276 case tok::caretequal: Opc = BO_XorAssign; break;
7277 case tok::pipeequal: Opc = BO_OrAssign; break;
7278 case tok::comma: Opc = BO_Comma; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00007279 }
7280 return Opc;
7281}
7282
John McCall2de56d12010-08-25 11:45:40 +00007283static inline UnaryOperatorKind ConvertTokenKindToUnaryOpcode(
Reid Spencer5f016e22007-07-11 17:01:13 +00007284 tok::TokenKind Kind) {
John McCall2de56d12010-08-25 11:45:40 +00007285 UnaryOperatorKind Opc;
Reid Spencer5f016e22007-07-11 17:01:13 +00007286 switch (Kind) {
7287 default: assert(0 && "Unknown unary op!");
John McCall2de56d12010-08-25 11:45:40 +00007288 case tok::plusplus: Opc = UO_PreInc; break;
7289 case tok::minusminus: Opc = UO_PreDec; break;
7290 case tok::amp: Opc = UO_AddrOf; break;
7291 case tok::star: Opc = UO_Deref; break;
7292 case tok::plus: Opc = UO_Plus; break;
7293 case tok::minus: Opc = UO_Minus; break;
7294 case tok::tilde: Opc = UO_Not; break;
7295 case tok::exclaim: Opc = UO_LNot; break;
7296 case tok::kw___real: Opc = UO_Real; break;
7297 case tok::kw___imag: Opc = UO_Imag; break;
7298 case tok::kw___extension__: Opc = UO_Extension; break;
Reid Spencer5f016e22007-07-11 17:01:13 +00007299 }
7300 return Opc;
7301}
7302
Douglas Gregoreaebc752008-11-06 23:29:22 +00007303/// CreateBuiltinBinOp - Creates a new built-in binary operation with
7304/// operator @p Opc at location @c TokLoc. This routine only supports
7305/// built-in operations; ActOnBinOp handles overloaded operators.
John McCall60d7b3a2010-08-24 06:29:42 +00007306ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00007307 unsigned Op,
7308 Expr *lhs, Expr *rhs) {
Eli Friedmanab3a8522009-03-28 01:22:36 +00007309 QualType ResultTy; // Result type of the binary operator.
John McCall2de56d12010-08-25 11:45:40 +00007310 BinaryOperatorKind Opc = (BinaryOperatorKind) Op;
Eli Friedmanab3a8522009-03-28 01:22:36 +00007311 // The following two variables are used for compound assignment operators
7312 QualType CompLHSTy; // Type of LHS after promotions for computation
7313 QualType CompResultTy; // Type of computation result
John McCallf89e55a2010-11-18 06:31:45 +00007314 ExprValueKind VK = VK_RValue;
7315 ExprObjectKind OK = OK_Ordinary;
Douglas Gregoreaebc752008-11-06 23:29:22 +00007316
7317 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00007318 case BO_Assign:
Douglas Gregoreaebc752008-11-06 23:29:22 +00007319 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType());
John McCallf89e55a2010-11-18 06:31:45 +00007320 if (getLangOptions().CPlusPlus) {
John McCall09431682010-11-18 19:01:18 +00007321 VK = lhs->getValueKind();
7322 OK = lhs->getObjectKind();
John McCallf89e55a2010-11-18 06:31:45 +00007323 }
Douglas Gregoreaebc752008-11-06 23:29:22 +00007324 break;
John McCall2de56d12010-08-25 11:45:40 +00007325 case BO_PtrMemD:
7326 case BO_PtrMemI:
John McCallf89e55a2010-11-18 06:31:45 +00007327 ResultTy = CheckPointerToMemberOperands(lhs, rhs, VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00007328 Opc == BO_PtrMemI);
Sebastian Redl22460502009-02-07 00:15:38 +00007329 break;
John McCall2de56d12010-08-25 11:45:40 +00007330 case BO_Mul:
7331 case BO_Div:
Chris Lattner7ef655a2010-01-12 21:23:57 +00007332 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, false,
John McCall2de56d12010-08-25 11:45:40 +00007333 Opc == BO_Div);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007334 break;
John McCall2de56d12010-08-25 11:45:40 +00007335 case BO_Rem:
Douglas Gregoreaebc752008-11-06 23:29:22 +00007336 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc);
7337 break;
John McCall2de56d12010-08-25 11:45:40 +00007338 case BO_Add:
Douglas Gregoreaebc752008-11-06 23:29:22 +00007339 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc);
7340 break;
John McCall2de56d12010-08-25 11:45:40 +00007341 case BO_Sub:
Douglas Gregoreaebc752008-11-06 23:29:22 +00007342 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc);
7343 break;
John McCall2de56d12010-08-25 11:45:40 +00007344 case BO_Shl:
7345 case BO_Shr:
Douglas Gregoreaebc752008-11-06 23:29:22 +00007346 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc);
7347 break;
John McCall2de56d12010-08-25 11:45:40 +00007348 case BO_LE:
7349 case BO_LT:
7350 case BO_GE:
7351 case BO_GT:
Douglas Gregora86b8322009-04-06 18:45:53 +00007352 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007353 break;
John McCall2de56d12010-08-25 11:45:40 +00007354 case BO_EQ:
7355 case BO_NE:
Douglas Gregora86b8322009-04-06 18:45:53 +00007356 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007357 break;
John McCall2de56d12010-08-25 11:45:40 +00007358 case BO_And:
7359 case BO_Xor:
7360 case BO_Or:
Douglas Gregoreaebc752008-11-06 23:29:22 +00007361 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc);
7362 break;
John McCall2de56d12010-08-25 11:45:40 +00007363 case BO_LAnd:
7364 case BO_LOr:
Chris Lattner90a8f272010-07-13 19:41:32 +00007365 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc, Opc);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007366 break;
John McCall2de56d12010-08-25 11:45:40 +00007367 case BO_MulAssign:
7368 case BO_DivAssign:
Chris Lattner7ef655a2010-01-12 21:23:57 +00007369 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true,
John McCallf89e55a2010-11-18 06:31:45 +00007370 Opc == BO_DivAssign);
Eli Friedmanab3a8522009-03-28 01:22:36 +00007371 CompLHSTy = CompResultTy;
7372 if (!CompResultTy.isNull())
7373 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007374 break;
John McCall2de56d12010-08-25 11:45:40 +00007375 case BO_RemAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00007376 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true);
7377 CompLHSTy = CompResultTy;
7378 if (!CompResultTy.isNull())
7379 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007380 break;
John McCall2de56d12010-08-25 11:45:40 +00007381 case BO_AddAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00007382 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy);
7383 if (!CompResultTy.isNull())
7384 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007385 break;
John McCall2de56d12010-08-25 11:45:40 +00007386 case BO_SubAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00007387 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy);
7388 if (!CompResultTy.isNull())
7389 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007390 break;
John McCall2de56d12010-08-25 11:45:40 +00007391 case BO_ShlAssign:
7392 case BO_ShrAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00007393 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true);
7394 CompLHSTy = CompResultTy;
7395 if (!CompResultTy.isNull())
7396 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007397 break;
John McCall2de56d12010-08-25 11:45:40 +00007398 case BO_AndAssign:
7399 case BO_XorAssign:
7400 case BO_OrAssign:
Eli Friedmanab3a8522009-03-28 01:22:36 +00007401 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true);
7402 CompLHSTy = CompResultTy;
7403 if (!CompResultTy.isNull())
7404 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy);
Douglas Gregoreaebc752008-11-06 23:29:22 +00007405 break;
John McCall2de56d12010-08-25 11:45:40 +00007406 case BO_Comma:
John McCall09431682010-11-18 19:01:18 +00007407 ResultTy = CheckCommaOperands(*this, lhs, rhs, OpLoc);
John McCallf89e55a2010-11-18 06:31:45 +00007408 if (getLangOptions().CPlusPlus) {
7409 VK = rhs->getValueKind();
7410 OK = rhs->getObjectKind();
7411 }
Douglas Gregoreaebc752008-11-06 23:29:22 +00007412 break;
7413 }
7414 if (ResultTy.isNull())
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00007415 return ExprError();
Eli Friedmanab3a8522009-03-28 01:22:36 +00007416 if (CompResultTy.isNull())
John McCallf89e55a2010-11-18 06:31:45 +00007417 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy,
7418 VK, OK, OpLoc));
7419
7420 if (getLangOptions().CPlusPlus) {
7421 VK = VK_LValue;
7422 OK = lhs->getObjectKind();
7423 }
7424 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy,
7425 VK, OK, CompLHSTy,
7426 CompResultTy, OpLoc));
Douglas Gregoreaebc752008-11-06 23:29:22 +00007427}
7428
Sebastian Redlaee3c932009-10-27 12:10:02 +00007429/// SuggestParentheses - Emit a diagnostic together with a fixit hint that wraps
7430/// ParenRange in parentheses.
Sebastian Redl6b169ac2009-10-26 17:01:32 +00007431static void SuggestParentheses(Sema &Self, SourceLocation Loc,
7432 const PartialDiagnostic &PD,
Douglas Gregor55b38842010-04-14 16:09:52 +00007433 const PartialDiagnostic &FirstNote,
7434 SourceRange FirstParenRange,
7435 const PartialDiagnostic &SecondNote,
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00007436 SourceRange SecondParenRange) {
Douglas Gregor55b38842010-04-14 16:09:52 +00007437 Self.Diag(Loc, PD);
7438
7439 if (!FirstNote.getDiagID())
7440 return;
7441
7442 SourceLocation EndLoc = Self.PP.getLocForEndOfToken(FirstParenRange.getEnd());
7443 if (!FirstParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
7444 // We can't display the parentheses, so just return.
Sebastian Redl6b169ac2009-10-26 17:01:32 +00007445 return;
7446 }
7447
Douglas Gregor55b38842010-04-14 16:09:52 +00007448 Self.Diag(Loc, FirstNote)
7449 << FixItHint::CreateInsertion(FirstParenRange.getBegin(), "(")
Douglas Gregor849b2432010-03-31 17:46:05 +00007450 << FixItHint::CreateInsertion(EndLoc, ")");
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007451
Douglas Gregor55b38842010-04-14 16:09:52 +00007452 if (!SecondNote.getDiagID())
Douglas Gregor827feec2010-01-08 00:20:23 +00007453 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007454
Douglas Gregor827feec2010-01-08 00:20:23 +00007455 EndLoc = Self.PP.getLocForEndOfToken(SecondParenRange.getEnd());
7456 if (!SecondParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
7457 // We can't display the parentheses, so just dig the
7458 // warning/error and return.
Douglas Gregor55b38842010-04-14 16:09:52 +00007459 Self.Diag(Loc, SecondNote);
Douglas Gregor827feec2010-01-08 00:20:23 +00007460 return;
7461 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007462
Douglas Gregor55b38842010-04-14 16:09:52 +00007463 Self.Diag(Loc, SecondNote)
Douglas Gregor849b2432010-03-31 17:46:05 +00007464 << FixItHint::CreateInsertion(SecondParenRange.getBegin(), "(")
7465 << FixItHint::CreateInsertion(EndLoc, ")");
Sebastian Redl6b169ac2009-10-26 17:01:32 +00007466}
7467
Sebastian Redlaee3c932009-10-27 12:10:02 +00007468/// DiagnoseBitwisePrecedence - Emit a warning when bitwise and comparison
7469/// operators are mixed in a way that suggests that the programmer forgot that
7470/// comparison operators have higher precedence. The most typical example of
7471/// such code is "flags & 0x0020 != 0", which is equivalent to "flags & 1".
John McCall2de56d12010-08-25 11:45:40 +00007472static void DiagnoseBitwisePrecedence(Sema &Self, BinaryOperatorKind Opc,
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007473 SourceLocation OpLoc,Expr *lhs,Expr *rhs){
Sebastian Redlaee3c932009-10-27 12:10:02 +00007474 typedef BinaryOperator BinOp;
7475 BinOp::Opcode lhsopc = static_cast<BinOp::Opcode>(-1),
7476 rhsopc = static_cast<BinOp::Opcode>(-1);
7477 if (BinOp *BO = dyn_cast<BinOp>(lhs))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007478 lhsopc = BO->getOpcode();
Sebastian Redlaee3c932009-10-27 12:10:02 +00007479 if (BinOp *BO = dyn_cast<BinOp>(rhs))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007480 rhsopc = BO->getOpcode();
7481
7482 // Subs are not binary operators.
7483 if (lhsopc == -1 && rhsopc == -1)
7484 return;
7485
7486 // Bitwise operations are sometimes used as eager logical ops.
7487 // Don't diagnose this.
Sebastian Redlaee3c932009-10-27 12:10:02 +00007488 if ((BinOp::isComparisonOp(lhsopc) || BinOp::isBitwiseOp(lhsopc)) &&
7489 (BinOp::isComparisonOp(rhsopc) || BinOp::isBitwiseOp(rhsopc)))
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007490 return;
7491
Sebastian Redlaee3c932009-10-27 12:10:02 +00007492 if (BinOp::isComparisonOp(lhsopc))
Sebastian Redl6b169ac2009-10-26 17:01:32 +00007493 SuggestParentheses(Self, OpLoc,
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00007494 Self.PDiag(diag::warn_precedence_bitwise_rel)
Sebastian Redlaee3c932009-10-27 12:10:02 +00007495 << SourceRange(lhs->getLocStart(), OpLoc)
7496 << BinOp::getOpcodeStr(Opc) << BinOp::getOpcodeStr(lhsopc),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00007497 Self.PDiag(diag::note_precedence_bitwise_first)
Douglas Gregor827feec2010-01-08 00:20:23 +00007498 << BinOp::getOpcodeStr(Opc),
Douglas Gregor55b38842010-04-14 16:09:52 +00007499 SourceRange(cast<BinOp>(lhs)->getRHS()->getLocStart(), rhs->getLocEnd()),
7500 Self.PDiag(diag::note_precedence_bitwise_silence)
7501 << BinOp::getOpcodeStr(lhsopc),
7502 lhs->getSourceRange());
Sebastian Redlaee3c932009-10-27 12:10:02 +00007503 else if (BinOp::isComparisonOp(rhsopc))
Sebastian Redl6b169ac2009-10-26 17:01:32 +00007504 SuggestParentheses(Self, OpLoc,
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00007505 Self.PDiag(diag::warn_precedence_bitwise_rel)
Sebastian Redlaee3c932009-10-27 12:10:02 +00007506 << SourceRange(OpLoc, rhs->getLocEnd())
7507 << BinOp::getOpcodeStr(Opc) << BinOp::getOpcodeStr(rhsopc),
Douglas Gregorfe6b2d42010-03-29 23:34:08 +00007508 Self.PDiag(diag::note_precedence_bitwise_first)
Douglas Gregor827feec2010-01-08 00:20:23 +00007509 << BinOp::getOpcodeStr(Opc),
Douglas Gregor55b38842010-04-14 16:09:52 +00007510 SourceRange(lhs->getLocEnd(), cast<BinOp>(rhs)->getLHS()->getLocStart()),
7511 Self.PDiag(diag::note_precedence_bitwise_silence)
7512 << BinOp::getOpcodeStr(rhsopc),
7513 rhs->getSourceRange());
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007514}
7515
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007516/// \brief It accepts a '&&' expr that is inside a '||' one.
7517/// Emit a diagnostic together with a fixit hint that wraps the '&&' expression
7518/// in parentheses.
7519static void
7520EmitDiagnosticForLogicalAndInLogicalOr(Sema &Self, SourceLocation OpLoc,
7521 Expr *E) {
7522 assert(isa<BinaryOperator>(E) &&
7523 cast<BinaryOperator>(E)->getOpcode() == BO_LAnd);
7524 SuggestParentheses(Self, OpLoc,
7525 Self.PDiag(diag::warn_logical_and_in_logical_or)
7526 << E->getSourceRange(),
7527 Self.PDiag(diag::note_logical_and_in_logical_or_silence),
7528 E->getSourceRange(),
7529 Self.PDiag(0), SourceRange());
7530}
7531
7532/// \brief Returns true if the given expression can be evaluated as a constant
7533/// 'true'.
7534static bool EvaluatesAsTrue(Sema &S, Expr *E) {
7535 bool Res;
7536 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && Res;
7537}
7538
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007539/// \brief Returns true if the given expression can be evaluated as a constant
7540/// 'false'.
7541static bool EvaluatesAsFalse(Sema &S, Expr *E) {
7542 bool Res;
7543 return E->EvaluateAsBooleanCondition(Res, S.getASTContext()) && !Res;
7544}
7545
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007546/// \brief Look for '&&' in the left hand of a '||' expr.
7547static void DiagnoseLogicalAndInLogicalOrLHS(Sema &S, SourceLocation OpLoc,
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007548 Expr *OrLHS, Expr *OrRHS) {
7549 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrLHS)) {
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007550 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007551 // If it's "a && b || 0" don't warn since the precedence doesn't matter.
7552 if (EvaluatesAsFalse(S, OrRHS))
7553 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007554 // If it's "1 && a || b" don't warn since the precedence doesn't matter.
7555 if (!EvaluatesAsTrue(S, Bop->getLHS()))
7556 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
7557 } else if (Bop->getOpcode() == BO_LOr) {
7558 if (BinaryOperator *RBop = dyn_cast<BinaryOperator>(Bop->getRHS())) {
7559 // If it's "a || b && 1 || c" we didn't warn earlier for
7560 // "a || b && 1", but warn now.
7561 if (RBop->getOpcode() == BO_LAnd && EvaluatesAsTrue(S, RBop->getRHS()))
7562 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, RBop);
7563 }
7564 }
7565 }
7566}
7567
7568/// \brief Look for '&&' in the right hand of a '||' expr.
7569static void DiagnoseLogicalAndInLogicalOrRHS(Sema &S, SourceLocation OpLoc,
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007570 Expr *OrLHS, Expr *OrRHS) {
7571 if (BinaryOperator *Bop = dyn_cast<BinaryOperator>(OrRHS)) {
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007572 if (Bop->getOpcode() == BO_LAnd) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007573 // If it's "0 || a && b" don't warn since the precedence doesn't matter.
7574 if (EvaluatesAsFalse(S, OrLHS))
7575 return;
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007576 // If it's "a || b && 1" don't warn since the precedence doesn't matter.
7577 if (!EvaluatesAsTrue(S, Bop->getRHS()))
7578 return EmitDiagnosticForLogicalAndInLogicalOr(S, OpLoc, Bop);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007579 }
7580 }
7581}
7582
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007583/// DiagnoseBinOpPrecedence - Emit warnings for expressions with tricky
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007584/// precedence.
John McCall2de56d12010-08-25 11:45:40 +00007585static void DiagnoseBinOpPrecedence(Sema &Self, BinaryOperatorKind Opc,
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007586 SourceLocation OpLoc, Expr *lhs, Expr *rhs){
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007587 // Diagnose "arg1 'bitwise' arg2 'eq' arg3".
Sebastian Redlaee3c932009-10-27 12:10:02 +00007588 if (BinaryOperator::isBitwiseOp(Opc))
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007589 return DiagnoseBitwisePrecedence(Self, Opc, OpLoc, lhs, rhs);
7590
Argyrios Kyrtzidis567bb712010-11-17 18:26:36 +00007591 // Warn about arg1 || arg2 && arg3, as GCC 4.3+ does.
7592 // We don't warn for 'assert(a || b && "bad")' since this is safe.
Argyrios Kyrtzidisd92ccaa2010-11-17 18:54:22 +00007593 if (Opc == BO_LOr && !OpLoc.isMacroID()/* Don't warn in macros. */) {
Argyrios Kyrtzidis47d512c2010-11-17 19:18:19 +00007594 DiagnoseLogicalAndInLogicalOrLHS(Self, OpLoc, lhs, rhs);
7595 DiagnoseLogicalAndInLogicalOrRHS(Self, OpLoc, lhs, rhs);
Argyrios Kyrtzidisbee77f72010-11-16 21:00:12 +00007596 }
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007597}
7598
Reid Spencer5f016e22007-07-11 17:01:13 +00007599// Binary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00007600ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc,
John McCall2de56d12010-08-25 11:45:40 +00007601 tok::TokenKind Kind,
7602 Expr *lhs, Expr *rhs) {
7603 BinaryOperatorKind Opc = ConvertTokenKindToBinaryOpcode(Kind);
Steve Narofff69936d2007-09-16 03:34:24 +00007604 assert((lhs != 0) && "ActOnBinOp(): missing left expression");
7605 assert((rhs != 0) && "ActOnBinOp(): missing right expression");
Reid Spencer5f016e22007-07-11 17:01:13 +00007606
Sebastian Redl9e1d29b2009-10-26 15:24:15 +00007607 // Emit warnings for tricky precedence issues, e.g. "bitfield & 0x4 == 0"
7608 DiagnoseBinOpPrecedence(*this, Opc, TokLoc, lhs, rhs);
7609
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00007610 return BuildBinOp(S, TokLoc, Opc, lhs, rhs);
7611}
7612
John McCall60d7b3a2010-08-24 06:29:42 +00007613ExprResult Sema::BuildBinOp(Scope *S, SourceLocation OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00007614 BinaryOperatorKind Opc,
7615 Expr *lhs, Expr *rhs) {
Douglas Gregor063daf62009-03-13 18:40:31 +00007616 if (getLangOptions().CPlusPlus &&
Fariborz Jahanianc4e1a682010-09-14 23:02:38 +00007617 ((!isa<ObjCImplicitSetterGetterRefExpr>(lhs) &&
7618 !isa<ObjCPropertyRefExpr>(lhs))
Fariborz Jahanianeb17e8b2010-09-17 20:45:45 +00007619 || rhs->isTypeDependent() || Opc != BO_Assign) &&
Mike Stump1eb44332009-09-09 15:08:12 +00007620 (lhs->getType()->isOverloadableType() ||
Douglas Gregor063daf62009-03-13 18:40:31 +00007621 rhs->getType()->isOverloadableType())) {
7622 // Find all of the overloaded operators visible from this
7623 // point. We perform both an operator-name lookup from the local
7624 // scope and an argument-dependent lookup based on the types of
7625 // the arguments.
John McCall6e266892010-01-26 03:27:55 +00007626 UnresolvedSet<16> Functions;
Douglas Gregor063daf62009-03-13 18:40:31 +00007627 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc);
John McCall6e266892010-01-26 03:27:55 +00007628 if (S && OverOp != OO_None)
7629 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(),
7630 Functions);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007631
Douglas Gregor063daf62009-03-13 18:40:31 +00007632 // Build the (potentially-overloaded, potentially-dependent)
7633 // binary operation.
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00007634 return CreateOverloadedBinOp(OpLoc, Opc, Functions, lhs, rhs);
Sebastian Redlb8a6aca2009-01-19 22:31:54 +00007635 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007636
Douglas Gregoreaebc752008-11-06 23:29:22 +00007637 // Build a built-in binary operation.
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00007638 return CreateBuiltinBinOp(OpLoc, Opc, lhs, rhs);
Reid Spencer5f016e22007-07-11 17:01:13 +00007639}
7640
John McCall60d7b3a2010-08-24 06:29:42 +00007641ExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00007642 unsigned OpcIn,
7643 Expr *Input) {
John McCall2de56d12010-08-25 11:45:40 +00007644 UnaryOperatorKind Opc = static_cast<UnaryOperatorKind>(OpcIn);
Douglas Gregor74253732008-11-19 15:42:04 +00007645
John McCallf89e55a2010-11-18 06:31:45 +00007646 ExprValueKind VK = VK_RValue;
7647 ExprObjectKind OK = OK_Ordinary;
Reid Spencer5f016e22007-07-11 17:01:13 +00007648 QualType resultType;
7649 switch (Opc) {
John McCall2de56d12010-08-25 11:45:40 +00007650 case UO_PreInc:
7651 case UO_PreDec:
7652 case UO_PostInc:
7653 case UO_PostDec:
John McCall09431682010-11-18 19:01:18 +00007654 resultType = CheckIncrementDecrementOperand(*this, Input, VK, OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00007655 Opc == UO_PreInc ||
7656 Opc == UO_PostInc,
7657 Opc == UO_PreInc ||
7658 Opc == UO_PreDec);
Reid Spencer5f016e22007-07-11 17:01:13 +00007659 break;
John McCall2de56d12010-08-25 11:45:40 +00007660 case UO_AddrOf:
John McCall09431682010-11-18 19:01:18 +00007661 resultType = CheckAddressOfOperand(*this, Input, OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00007662 break;
John McCall2de56d12010-08-25 11:45:40 +00007663 case UO_Deref:
Douglas Gregora873dfc2010-02-03 00:27:59 +00007664 DefaultFunctionArrayLvalueConversion(Input);
John McCall09431682010-11-18 19:01:18 +00007665 resultType = CheckIndirectionOperand(*this, Input, VK, OpLoc);
Reid Spencer5f016e22007-07-11 17:01:13 +00007666 break;
John McCall2de56d12010-08-25 11:45:40 +00007667 case UO_Plus:
7668 case UO_Minus:
Steve Naroffc80b4ee2007-07-16 21:54:35 +00007669 UsualUnaryConversions(Input);
7670 resultType = Input->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00007671 if (resultType->isDependentType())
7672 break;
Douglas Gregor00619622010-06-22 23:41:02 +00007673 if (resultType->isArithmeticType() || // C99 6.5.3.3p1
7674 resultType->isVectorType())
Douglas Gregor74253732008-11-19 15:42:04 +00007675 break;
7676 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7
7677 resultType->isEnumeralType())
7678 break;
7679 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6
John McCall2de56d12010-08-25 11:45:40 +00007680 Opc == UO_Plus &&
Douglas Gregor74253732008-11-19 15:42:04 +00007681 resultType->isPointerType())
7682 break;
John McCall2cd11fe2010-10-12 02:09:17 +00007683 else if (resultType->isPlaceholderType()) {
7684 ExprResult PR = CheckPlaceholderExpr(Input, OpLoc);
7685 if (PR.isInvalid()) return ExprError();
7686 return CreateBuiltinUnaryOp(OpLoc, OpcIn, PR.take());
7687 }
Douglas Gregor74253732008-11-19 15:42:04 +00007688
Sebastian Redl0eb23302009-01-19 00:08:26 +00007689 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
7690 << resultType << Input->getSourceRange());
John McCall2de56d12010-08-25 11:45:40 +00007691 case UO_Not: // bitwise complement
Steve Naroffc80b4ee2007-07-16 21:54:35 +00007692 UsualUnaryConversions(Input);
7693 resultType = Input->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00007694 if (resultType->isDependentType())
7695 break;
Chris Lattner02a65142008-07-25 23:52:49 +00007696 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension.
7697 if (resultType->isComplexType() || resultType->isComplexIntegerType())
7698 // C99 does not support '~' for complex conjugation.
Chris Lattnerd3a94e22008-11-20 06:06:08 +00007699 Diag(OpLoc, diag::ext_integer_complement_complex)
Chris Lattnerd1625842008-11-24 06:25:27 +00007700 << resultType << Input->getSourceRange();
John McCall2cd11fe2010-10-12 02:09:17 +00007701 else if (resultType->hasIntegerRepresentation())
7702 break;
7703 else if (resultType->isPlaceholderType()) {
7704 ExprResult PR = CheckPlaceholderExpr(Input, OpLoc);
7705 if (PR.isInvalid()) return ExprError();
7706 return CreateBuiltinUnaryOp(OpLoc, OpcIn, PR.take());
7707 } else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00007708 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
7709 << resultType << Input->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00007710 }
Reid Spencer5f016e22007-07-11 17:01:13 +00007711 break;
John McCall2de56d12010-08-25 11:45:40 +00007712 case UO_LNot: // logical negation
Reid Spencer5f016e22007-07-11 17:01:13 +00007713 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5).
Douglas Gregora873dfc2010-02-03 00:27:59 +00007714 DefaultFunctionArrayLvalueConversion(Input);
Steve Naroffc80b4ee2007-07-16 21:54:35 +00007715 resultType = Input->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00007716 if (resultType->isDependentType())
7717 break;
John McCall2cd11fe2010-10-12 02:09:17 +00007718 if (resultType->isScalarType()) { // C99 6.5.3.3p1
7719 // ok, fallthrough
7720 } else if (resultType->isPlaceholderType()) {
7721 ExprResult PR = CheckPlaceholderExpr(Input, OpLoc);
7722 if (PR.isInvalid()) return ExprError();
7723 return CreateBuiltinUnaryOp(OpLoc, OpcIn, PR.take());
7724 } else {
Sebastian Redl0eb23302009-01-19 00:08:26 +00007725 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr)
7726 << resultType << Input->getSourceRange());
John McCall2cd11fe2010-10-12 02:09:17 +00007727 }
Douglas Gregorea844f32010-09-20 17:13:33 +00007728
Reid Spencer5f016e22007-07-11 17:01:13 +00007729 // LNot always has type int. C99 6.5.3.3p5.
Sebastian Redl0eb23302009-01-19 00:08:26 +00007730 // In C++, it's bool. C++ 5.3.1p8
7731 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy;
Reid Spencer5f016e22007-07-11 17:01:13 +00007732 break;
John McCall2de56d12010-08-25 11:45:40 +00007733 case UO_Real:
7734 case UO_Imag:
John McCall09431682010-11-18 19:01:18 +00007735 resultType = CheckRealImagOperand(*this, Input, OpLoc, Opc == UO_Real);
John McCallf89e55a2010-11-18 06:31:45 +00007736 // _Real and _Imag map ordinary l-values into ordinary l-values.
7737 if (Input->getValueKind() != VK_RValue &&
7738 Input->getObjectKind() == OK_Ordinary)
7739 VK = Input->getValueKind();
Chris Lattnerdbb36972007-08-24 21:16:53 +00007740 break;
John McCall2de56d12010-08-25 11:45:40 +00007741 case UO_Extension:
Reid Spencer5f016e22007-07-11 17:01:13 +00007742 resultType = Input->getType();
John McCallf89e55a2010-11-18 06:31:45 +00007743 VK = Input->getValueKind();
7744 OK = Input->getObjectKind();
Reid Spencer5f016e22007-07-11 17:01:13 +00007745 break;
7746 }
7747 if (resultType.isNull())
Sebastian Redl0eb23302009-01-19 00:08:26 +00007748 return ExprError();
Douglas Gregorbc736fc2009-03-13 23:49:33 +00007749
John McCallf89e55a2010-11-18 06:31:45 +00007750 return Owned(new (Context) UnaryOperator(Input, Opc, resultType,
7751 VK, OK, OpLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +00007752}
7753
John McCall60d7b3a2010-08-24 06:29:42 +00007754ExprResult Sema::BuildUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall2de56d12010-08-25 11:45:40 +00007755 UnaryOperatorKind Opc,
7756 Expr *Input) {
Anders Carlssona8a1e3d2009-11-14 21:26:41 +00007757 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType() &&
Eli Friedman957c0942010-09-05 23:15:52 +00007758 UnaryOperator::getOverloadedOperator(Opc) != OO_None) {
Douglas Gregorbc736fc2009-03-13 23:49:33 +00007759 // Find all of the overloaded operators visible from this
7760 // point. We perform both an operator-name lookup from the local
7761 // scope and an argument-dependent lookup based on the types of
7762 // the arguments.
John McCall6e266892010-01-26 03:27:55 +00007763 UnresolvedSet<16> Functions;
Douglas Gregorbc736fc2009-03-13 23:49:33 +00007764 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc);
John McCall6e266892010-01-26 03:27:55 +00007765 if (S && OverOp != OO_None)
7766 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(),
7767 Functions);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007768
John McCall9ae2f072010-08-23 23:25:46 +00007769 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00007770 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00007771
John McCall9ae2f072010-08-23 23:25:46 +00007772 return CreateBuiltinUnaryOp(OpLoc, Opc, Input);
Douglas Gregorbc736fc2009-03-13 23:49:33 +00007773}
7774
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00007775// Unary Operators. 'Tok' is the token for the operator.
John McCall60d7b3a2010-08-24 06:29:42 +00007776ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc,
John McCall9ae2f072010-08-23 23:25:46 +00007777 tok::TokenKind Op, Expr *Input) {
7778 return BuildUnaryOp(S, OpLoc, ConvertTokenKindToUnaryOpcode(Op), Input);
Douglas Gregor6ca7cfb2009-11-05 00:51:44 +00007779}
7780
Steve Naroff1b273c42007-09-16 14:56:35 +00007781/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo".
John McCall60d7b3a2010-08-24 06:29:42 +00007782ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc,
Sebastian Redlf53597f2009-03-15 17:47:39 +00007783 SourceLocation LabLoc,
7784 IdentifierInfo *LabelII) {
Reid Spencer5f016e22007-07-11 17:01:13 +00007785 // Look up the record for this label identifier.
John McCall781472f2010-08-25 08:40:02 +00007786 LabelStmt *&LabelDecl = getCurFunction()->LabelMap[LabelII];
Mike Stumpeed9cac2009-02-19 03:04:26 +00007787
Daniel Dunbar0ffb1252008-08-04 16:51:22 +00007788 // If we haven't seen this label yet, create a forward reference. It
7789 // will be validated and/or cleaned up in ActOnFinishFunctionBody.
Steve Naroffcaaacec2009-03-13 15:38:40 +00007790 if (LabelDecl == 0)
Steve Naroff6ece14c2009-01-21 00:14:39 +00007791 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0);
Mike Stumpeed9cac2009-02-19 03:04:26 +00007792
Argyrios Kyrtzidis355a9fe2010-09-19 21:21:25 +00007793 LabelDecl->setUsed();
Reid Spencer5f016e22007-07-11 17:01:13 +00007794 // Create the AST node. The address of a label always has type 'void*'.
Sebastian Redlf53597f2009-03-15 17:47:39 +00007795 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl,
7796 Context.getPointerType(Context.VoidTy)));
Reid Spencer5f016e22007-07-11 17:01:13 +00007797}
7798
John McCall60d7b3a2010-08-24 06:29:42 +00007799ExprResult
John McCall9ae2f072010-08-23 23:25:46 +00007800Sema::ActOnStmtExpr(SourceLocation LPLoc, Stmt *SubStmt,
Sebastian Redlf53597f2009-03-15 17:47:39 +00007801 SourceLocation RPLoc) { // "({..})"
Chris Lattnerab18c4c2007-07-24 16:58:17 +00007802 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!");
7803 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt);
7804
Douglas Gregordd8f5692010-03-10 04:54:39 +00007805 bool isFileScope
7806 = (getCurFunctionOrMethodDecl() == 0) && (getCurBlock() == 0);
Chris Lattner4a049f02009-04-25 19:11:05 +00007807 if (isFileScope)
Sebastian Redlf53597f2009-03-15 17:47:39 +00007808 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope));
Eli Friedmandca2b732009-01-24 23:09:00 +00007809
Chris Lattnerab18c4c2007-07-24 16:58:17 +00007810 // FIXME: there are a variety of strange constraints to enforce here, for
7811 // example, it is not possible to goto into a stmt expression apparently.
7812 // More semantic analysis is needed.
Mike Stumpeed9cac2009-02-19 03:04:26 +00007813
Chris Lattnerab18c4c2007-07-24 16:58:17 +00007814 // If there are sub stmts in the compound stmt, take the type of the last one
7815 // as the type of the stmtexpr.
7816 QualType Ty = Context.VoidTy;
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00007817 bool StmtExprMayBindToTemp = false;
Chris Lattner611b2ec2008-07-26 19:51:01 +00007818 if (!Compound->body_empty()) {
7819 Stmt *LastStmt = Compound->body_back();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00007820 LabelStmt *LastLabelStmt = 0;
Chris Lattner611b2ec2008-07-26 19:51:01 +00007821 // If LastStmt is a label, skip down through into the body.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00007822 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) {
7823 LastLabelStmt = Label;
Chris Lattner611b2ec2008-07-26 19:51:01 +00007824 LastStmt = Label->getSubStmt();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00007825 }
7826 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) {
Fariborz Jahanian4bdc4462010-10-27 20:44:00 +00007827 DefaultFunctionArrayLvalueConversion(LastExpr);
Chris Lattnerab18c4c2007-07-24 16:58:17 +00007828 Ty = LastExpr->getType();
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00007829 if (!Ty->isDependentType() && !LastExpr->isTypeDependent()) {
7830 ExprResult Res = PerformCopyInitialization(
7831 InitializedEntity::InitializeResult(LPLoc,
7832 Ty,
7833 false),
7834 SourceLocation(),
7835 Owned(LastExpr));
7836 if (Res.isInvalid())
7837 return ExprError();
7838 if ((LastExpr = Res.takeAs<Expr>())) {
7839 if (!LastLabelStmt)
7840 Compound->setLastStmt(LastExpr);
7841 else
7842 LastLabelStmt->setSubStmt(LastExpr);
7843 StmtExprMayBindToTemp = true;
7844 }
7845 }
7846 }
Chris Lattner611b2ec2008-07-26 19:51:01 +00007847 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00007848
Eli Friedmanb1d796d2009-03-23 00:24:07 +00007849 // FIXME: Check that expression type is complete/non-abstract; statement
7850 // expressions are not lvalues.
Fariborz Jahaniane946fc82010-10-25 23:27:26 +00007851 Expr *ResStmtExpr = new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc);
7852 if (StmtExprMayBindToTemp)
7853 return MaybeBindToTemporary(ResStmtExpr);
7854 return Owned(ResStmtExpr);
Chris Lattnerab18c4c2007-07-24 16:58:17 +00007855}
Steve Naroffd34e9152007-08-01 22:05:33 +00007856
John McCall60d7b3a2010-08-24 06:29:42 +00007857ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00007858 TypeSourceInfo *TInfo,
7859 OffsetOfComponent *CompPtr,
7860 unsigned NumComponents,
7861 SourceLocation RParenLoc) {
Douglas Gregor8ecdb652010-04-28 22:16:22 +00007862 QualType ArgTy = TInfo->getType();
Sebastian Redl28507842009-02-26 14:39:58 +00007863 bool Dependent = ArgTy->isDependentType();
Abramo Bagnarabd054db2010-05-20 10:00:11 +00007864 SourceRange TypeRange = TInfo->getTypeLoc().getLocalSourceRange();
Douglas Gregor8ecdb652010-04-28 22:16:22 +00007865
Chris Lattner73d0d4f2007-08-30 17:45:32 +00007866 // We must have at least one component that refers to the type, and the first
7867 // one is known to be a field designator. Verify that the ArgTy represents
7868 // a struct/union/class.
Sebastian Redl28507842009-02-26 14:39:58 +00007869 if (!Dependent && !ArgTy->isRecordType())
Douglas Gregor8ecdb652010-04-28 22:16:22 +00007870 return ExprError(Diag(BuiltinLoc, diag::err_offsetof_record_type)
7871 << ArgTy << TypeRange);
7872
7873 // Type must be complete per C99 7.17p3 because a declaring a variable
7874 // with an incomplete type would be ill-formed.
7875 if (!Dependent
7876 && RequireCompleteType(BuiltinLoc, ArgTy,
7877 PDiag(diag::err_offsetof_incomplete_type)
7878 << TypeRange))
7879 return ExprError();
7880
Chris Lattner9e2b75c2007-08-31 21:49:13 +00007881 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a
7882 // GCC extension, diagnose them.
Eli Friedman35183ac2009-02-27 06:44:11 +00007883 // FIXME: This diagnostic isn't actually visible because the location is in
7884 // a system header!
Chris Lattner9e2b75c2007-08-31 21:49:13 +00007885 if (NumComponents != 1)
Chris Lattnerdcd5ef12008-11-19 05:27:50 +00007886 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator)
7887 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd);
Douglas Gregor8ecdb652010-04-28 22:16:22 +00007888
7889 bool DidWarnAboutNonPOD = false;
7890 QualType CurrentType = ArgTy;
7891 typedef OffsetOfExpr::OffsetOfNode OffsetOfNode;
7892 llvm::SmallVector<OffsetOfNode, 4> Comps;
7893 llvm::SmallVector<Expr*, 4> Exprs;
7894 for (unsigned i = 0; i != NumComponents; ++i) {
7895 const OffsetOfComponent &OC = CompPtr[i];
7896 if (OC.isBrackets) {
7897 // Offset of an array sub-field. TODO: Should we allow vector elements?
7898 if (!CurrentType->isDependentType()) {
7899 const ArrayType *AT = Context.getAsArrayType(CurrentType);
7900 if(!AT)
7901 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type)
7902 << CurrentType);
7903 CurrentType = AT->getElementType();
7904 } else
7905 CurrentType = Context.DependentTy;
7906
7907 // The expression must be an integral expression.
7908 // FIXME: An integral constant expression?
7909 Expr *Idx = static_cast<Expr*>(OC.U.E);
7910 if (!Idx->isTypeDependent() && !Idx->isValueDependent() &&
7911 !Idx->getType()->isIntegerType())
7912 return ExprError(Diag(Idx->getLocStart(),
7913 diag::err_typecheck_subscript_not_integer)
7914 << Idx->getSourceRange());
7915
7916 // Record this array index.
7917 Comps.push_back(OffsetOfNode(OC.LocStart, Exprs.size(), OC.LocEnd));
7918 Exprs.push_back(Idx);
7919 continue;
7920 }
7921
7922 // Offset of a field.
7923 if (CurrentType->isDependentType()) {
7924 // We have the offset of a field, but we can't look into the dependent
7925 // type. Just record the identifier of the field.
7926 Comps.push_back(OffsetOfNode(OC.LocStart, OC.U.IdentInfo, OC.LocEnd));
7927 CurrentType = Context.DependentTy;
7928 continue;
7929 }
7930
7931 // We need to have a complete type to look into.
7932 if (RequireCompleteType(OC.LocStart, CurrentType,
7933 diag::err_offsetof_incomplete_type))
7934 return ExprError();
7935
7936 // Look for the designated field.
7937 const RecordType *RC = CurrentType->getAs<RecordType>();
7938 if (!RC)
7939 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type)
7940 << CurrentType);
7941 RecordDecl *RD = RC->getDecl();
7942
7943 // C++ [lib.support.types]p5:
7944 // The macro offsetof accepts a restricted set of type arguments in this
7945 // International Standard. type shall be a POD structure or a POD union
7946 // (clause 9).
7947 if (CXXRecordDecl *CRD = dyn_cast<CXXRecordDecl>(RD)) {
7948 if (!CRD->isPOD() && !DidWarnAboutNonPOD &&
7949 DiagRuntimeBehavior(BuiltinLoc,
7950 PDiag(diag::warn_offsetof_non_pod_type)
7951 << SourceRange(CompPtr[0].LocStart, OC.LocEnd)
7952 << CurrentType))
7953 DidWarnAboutNonPOD = true;
7954 }
7955
7956 // Look for the field.
7957 LookupResult R(*this, OC.U.IdentInfo, OC.LocStart, LookupMemberName);
7958 LookupQualifiedName(R, RD);
7959 FieldDecl *MemberDecl = R.getAsSingle<FieldDecl>();
Francois Pichet87c2e122010-11-21 06:08:52 +00007960 IndirectFieldDecl *IndirectMemberDecl = 0;
7961 if (!MemberDecl) {
Benjamin Kramerd9811462010-11-21 14:11:41 +00007962 if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
Francois Pichet87c2e122010-11-21 06:08:52 +00007963 MemberDecl = IndirectMemberDecl->getAnonField();
7964 }
7965
Douglas Gregor8ecdb652010-04-28 22:16:22 +00007966 if (!MemberDecl)
7967 return ExprError(Diag(BuiltinLoc, diag::err_no_member)
7968 << OC.U.IdentInfo << RD << SourceRange(OC.LocStart,
7969 OC.LocEnd));
7970
Douglas Gregor9d5d60f2010-04-28 22:36:06 +00007971 // C99 7.17p3:
7972 // (If the specified member is a bit-field, the behavior is undefined.)
7973 //
7974 // We diagnose this as an error.
7975 if (MemberDecl->getBitWidth()) {
7976 Diag(OC.LocEnd, diag::err_offsetof_bitfield)
7977 << MemberDecl->getDeclName()
7978 << SourceRange(BuiltinLoc, RParenLoc);
7979 Diag(MemberDecl->getLocation(), diag::note_bitfield_decl);
7980 return ExprError();
7981 }
Eli Friedman19410a72010-08-05 10:11:36 +00007982
7983 RecordDecl *Parent = MemberDecl->getParent();
Francois Pichet87c2e122010-11-21 06:08:52 +00007984 if (IndirectMemberDecl)
7985 Parent = cast<RecordDecl>(IndirectMemberDecl->getDeclContext());
Eli Friedman19410a72010-08-05 10:11:36 +00007986
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00007987 // If the member was found in a base class, introduce OffsetOfNodes for
7988 // the base class indirections.
7989 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true,
7990 /*DetectVirtual=*/false);
Eli Friedman19410a72010-08-05 10:11:36 +00007991 if (IsDerivedFrom(CurrentType, Context.getTypeDeclType(Parent), Paths)) {
Douglas Gregorcc8a5d52010-04-29 00:18:15 +00007992 CXXBasePath &Path = Paths.front();
7993 for (CXXBasePath::iterator B = Path.begin(), BEnd = Path.end();
7994 B != BEnd; ++B)
7995 Comps.push_back(OffsetOfNode(B->Base));
7996 }
Eli Friedman19410a72010-08-05 10:11:36 +00007997
Francois Pichet87c2e122010-11-21 06:08:52 +00007998 if (IndirectMemberDecl) {
7999 for (IndirectFieldDecl::chain_iterator FI =
8000 IndirectMemberDecl->chain_begin(),
8001 FEnd = IndirectMemberDecl->chain_end(); FI != FEnd; FI++) {
8002 assert(isa<FieldDecl>(*FI));
8003 Comps.push_back(OffsetOfNode(OC.LocStart,
8004 cast<FieldDecl>(*FI), OC.LocEnd));
8005 }
8006 } else
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008007 Comps.push_back(OffsetOfNode(OC.LocStart, MemberDecl, OC.LocEnd));
Francois Pichet87c2e122010-11-21 06:08:52 +00008008
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008009 CurrentType = MemberDecl->getType().getNonReferenceType();
8010 }
8011
8012 return Owned(OffsetOfExpr::Create(Context, Context.getSizeType(), BuiltinLoc,
8013 TInfo, Comps.data(), Comps.size(),
8014 Exprs.data(), Exprs.size(), RParenLoc));
8015}
Mike Stumpeed9cac2009-02-19 03:04:26 +00008016
John McCall60d7b3a2010-08-24 06:29:42 +00008017ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S,
John McCall2cd11fe2010-10-12 02:09:17 +00008018 SourceLocation BuiltinLoc,
8019 SourceLocation TypeLoc,
8020 ParsedType argty,
8021 OffsetOfComponent *CompPtr,
8022 unsigned NumComponents,
8023 SourceLocation RPLoc) {
8024
Douglas Gregor8ecdb652010-04-28 22:16:22 +00008025 TypeSourceInfo *ArgTInfo;
8026 QualType ArgTy = GetTypeFromParser(argty, &ArgTInfo);
8027 if (ArgTy.isNull())
8028 return ExprError();
8029
Eli Friedman5a15dc12010-08-05 10:15:45 +00008030 if (!ArgTInfo)
8031 ArgTInfo = Context.getTrivialTypeSourceInfo(ArgTy, TypeLoc);
8032
8033 return BuildBuiltinOffsetOf(BuiltinLoc, ArgTInfo, CompPtr, NumComponents,
8034 RPLoc);
Chris Lattner73d0d4f2007-08-30 17:45:32 +00008035}
8036
8037
John McCall60d7b3a2010-08-24 06:29:42 +00008038ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00008039 ParsedType arg1, ParsedType arg2,
8040 SourceLocation RPLoc) {
Abramo Bagnara3fcb73d2010-08-10 08:50:03 +00008041 TypeSourceInfo *argTInfo1;
8042 QualType argT1 = GetTypeFromParser(arg1, &argTInfo1);
8043 TypeSourceInfo *argTInfo2;
8044 QualType argT2 = GetTypeFromParser(arg2, &argTInfo2);
Mike Stumpeed9cac2009-02-19 03:04:26 +00008045
Steve Naroffd34e9152007-08-01 22:05:33 +00008046 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)");
Mike Stumpeed9cac2009-02-19 03:04:26 +00008047
Abramo Bagnara3fcb73d2010-08-10 08:50:03 +00008048 return BuildTypesCompatibleExpr(BuiltinLoc, argTInfo1, argTInfo2, RPLoc);
8049}
8050
John McCall60d7b3a2010-08-24 06:29:42 +00008051ExprResult
Abramo Bagnara3fcb73d2010-08-10 08:50:03 +00008052Sema::BuildTypesCompatibleExpr(SourceLocation BuiltinLoc,
8053 TypeSourceInfo *argTInfo1,
8054 TypeSourceInfo *argTInfo2,
8055 SourceLocation RPLoc) {
Douglas Gregorc12a9c52009-05-19 22:28:02 +00008056 if (getLangOptions().CPlusPlus) {
8057 Diag(BuiltinLoc, diag::err_types_compatible_p_in_cplusplus)
8058 << SourceRange(BuiltinLoc, RPLoc);
8059 return ExprError();
8060 }
8061
Sebastian Redlf53597f2009-03-15 17:47:39 +00008062 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc,
Abramo Bagnara3fcb73d2010-08-10 08:50:03 +00008063 argTInfo1, argTInfo2, RPLoc));
Steve Naroffd34e9152007-08-01 22:05:33 +00008064}
8065
Abramo Bagnara3fcb73d2010-08-10 08:50:03 +00008066
John McCall60d7b3a2010-08-24 06:29:42 +00008067ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc,
John McCall2cd11fe2010-10-12 02:09:17 +00008068 Expr *CondExpr,
8069 Expr *LHSExpr, Expr *RHSExpr,
8070 SourceLocation RPLoc) {
Steve Naroffd04fdd52007-08-03 21:21:27 +00008071 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)");
8072
John McCallf89e55a2010-11-18 06:31:45 +00008073 ExprValueKind VK = VK_RValue;
8074 ExprObjectKind OK = OK_Ordinary;
Sebastian Redl28507842009-02-26 14:39:58 +00008075 QualType resType;
Douglas Gregorce940492009-09-25 04:25:58 +00008076 bool ValueDependent = false;
Douglas Gregorc9ecc572009-05-19 22:43:30 +00008077 if (CondExpr->isTypeDependent() || CondExpr->isValueDependent()) {
Sebastian Redl28507842009-02-26 14:39:58 +00008078 resType = Context.DependentTy;
Douglas Gregorce940492009-09-25 04:25:58 +00008079 ValueDependent = true;
Sebastian Redl28507842009-02-26 14:39:58 +00008080 } else {
8081 // The conditional expression is required to be a constant expression.
8082 llvm::APSInt condEval(32);
8083 SourceLocation ExpLoc;
8084 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc))
Sebastian Redlf53597f2009-03-15 17:47:39 +00008085 return ExprError(Diag(ExpLoc,
8086 diag::err_typecheck_choose_expr_requires_constant)
8087 << CondExpr->getSourceRange());
Steve Naroffd04fdd52007-08-03 21:21:27 +00008088
Sebastian Redl28507842009-02-26 14:39:58 +00008089 // If the condition is > zero, then the AST type is the same as the LSHExpr.
John McCallf89e55a2010-11-18 06:31:45 +00008090 Expr *ActiveExpr = condEval.getZExtValue() ? LHSExpr : RHSExpr;
8091
8092 resType = ActiveExpr->getType();
8093 ValueDependent = ActiveExpr->isValueDependent();
8094 VK = ActiveExpr->getValueKind();
8095 OK = ActiveExpr->getObjectKind();
Sebastian Redl28507842009-02-26 14:39:58 +00008096 }
8097
Sebastian Redlf53597f2009-03-15 17:47:39 +00008098 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr,
John McCallf89e55a2010-11-18 06:31:45 +00008099 resType, VK, OK, RPLoc,
Douglas Gregorce940492009-09-25 04:25:58 +00008100 resType->isDependentType(),
8101 ValueDependent));
Steve Naroffd04fdd52007-08-03 21:21:27 +00008102}
8103
Steve Naroff4eb206b2008-09-03 18:15:37 +00008104//===----------------------------------------------------------------------===//
8105// Clang Extensions.
8106//===----------------------------------------------------------------------===//
8107
8108/// ActOnBlockStart - This callback is invoked when a block literal is started.
Steve Naroff090276f2008-10-10 01:28:17 +00008109void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) {
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008110 BlockDecl *Block = BlockDecl::Create(Context, CurContext, CaretLoc);
8111 PushBlockScope(BlockScope, Block);
8112 CurContext->addDecl(Block);
Fariborz Jahaniana729da22010-07-09 18:44:02 +00008113 if (BlockScope)
8114 PushDeclContext(BlockScope, Block);
8115 else
8116 CurContext = Block;
Steve Naroff090276f2008-10-10 01:28:17 +00008117}
8118
Mike Stump98eb8a72009-02-04 22:31:32 +00008119void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) {
Mike Stumpaf199f32009-05-07 18:43:07 +00008120 assert(ParamInfo.getIdentifier()==0 && "block-id should have no identifier!");
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008121 BlockScopeInfo *CurBlock = getCurBlock();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008122
John McCallbf1a0282010-06-04 23:28:52 +00008123 TypeSourceInfo *Sig = GetTypeForDeclarator(ParamInfo, CurScope);
John McCall82dc0092010-06-04 11:21:44 +00008124 CurBlock->TheDecl->setSignatureAsWritten(Sig);
John McCallbf1a0282010-06-04 23:28:52 +00008125 QualType T = Sig->getType();
Mike Stump98eb8a72009-02-04 22:31:32 +00008126
John McCallc71a4912010-06-04 19:02:56 +00008127 bool isVariadic;
John McCall82dc0092010-06-04 11:21:44 +00008128 QualType RetTy;
8129 if (const FunctionType *Fn = T->getAs<FunctionType>()) {
John McCallc71a4912010-06-04 19:02:56 +00008130 CurBlock->FunctionType = T;
John McCall82dc0092010-06-04 11:21:44 +00008131 RetTy = Fn->getResultType();
John McCallc71a4912010-06-04 19:02:56 +00008132 isVariadic =
John McCall82dc0092010-06-04 11:21:44 +00008133 !isa<FunctionProtoType>(Fn) || cast<FunctionProtoType>(Fn)->isVariadic();
8134 } else {
8135 RetTy = T;
John McCallc71a4912010-06-04 19:02:56 +00008136 isVariadic = false;
John McCall82dc0092010-06-04 11:21:44 +00008137 }
Mike Stump1eb44332009-09-09 15:08:12 +00008138
John McCallc71a4912010-06-04 19:02:56 +00008139 CurBlock->TheDecl->setIsVariadic(isVariadic);
Douglas Gregora873dfc2010-02-03 00:27:59 +00008140
John McCall82dc0092010-06-04 11:21:44 +00008141 // Don't allow returning an array by value.
8142 if (RetTy->isArrayType()) {
8143 Diag(ParamInfo.getSourceRange().getBegin(), diag::err_block_returns_array);
Mike Stump98eb8a72009-02-04 22:31:32 +00008144 return;
8145 }
8146
John McCall82dc0092010-06-04 11:21:44 +00008147 // Don't allow returning a objc interface by value.
8148 if (RetTy->isObjCObjectType()) {
8149 Diag(ParamInfo.getSourceRange().getBegin(),
8150 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy;
8151 return;
8152 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008153
John McCall82dc0092010-06-04 11:21:44 +00008154 // Context.DependentTy is used as a placeholder for a missing block
John McCallc71a4912010-06-04 19:02:56 +00008155 // return type. TODO: what should we do with declarators like:
8156 // ^ * { ... }
8157 // If the answer is "apply template argument deduction"....
John McCall82dc0092010-06-04 11:21:44 +00008158 if (RetTy != Context.DependentTy)
8159 CurBlock->ReturnType = RetTy;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008160
John McCall82dc0092010-06-04 11:21:44 +00008161 // Push block parameters from the declarator if we had them.
John McCallc71a4912010-06-04 19:02:56 +00008162 llvm::SmallVector<ParmVarDecl*, 8> Params;
John McCall82dc0092010-06-04 11:21:44 +00008163 if (isa<FunctionProtoType>(T)) {
8164 FunctionProtoTypeLoc TL = cast<FunctionProtoTypeLoc>(Sig->getTypeLoc());
8165 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) {
8166 ParmVarDecl *Param = TL.getArg(I);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00008167 if (Param->getIdentifier() == 0 &&
8168 !Param->isImplicit() &&
8169 !Param->isInvalidDecl() &&
8170 !getLangOptions().CPlusPlus)
8171 Diag(Param->getLocation(), diag::err_parameter_name_omitted);
John McCallc71a4912010-06-04 19:02:56 +00008172 Params.push_back(Param);
Fariborz Jahanian9a66c302010-02-12 21:53:14 +00008173 }
John McCall82dc0092010-06-04 11:21:44 +00008174
8175 // Fake up parameter variables if we have a typedef, like
8176 // ^ fntype { ... }
8177 } else if (const FunctionProtoType *Fn = T->getAs<FunctionProtoType>()) {
8178 for (FunctionProtoType::arg_type_iterator
8179 I = Fn->arg_type_begin(), E = Fn->arg_type_end(); I != E; ++I) {
8180 ParmVarDecl *Param =
8181 BuildParmVarDeclForTypedef(CurBlock->TheDecl,
8182 ParamInfo.getSourceRange().getBegin(),
8183 *I);
John McCallc71a4912010-06-04 19:02:56 +00008184 Params.push_back(Param);
John McCall82dc0092010-06-04 11:21:44 +00008185 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00008186 }
John McCall82dc0092010-06-04 11:21:44 +00008187
John McCallc71a4912010-06-04 19:02:56 +00008188 // Set the parameters on the block decl.
Douglas Gregor82aa7132010-11-01 18:37:59 +00008189 if (!Params.empty()) {
John McCallc71a4912010-06-04 19:02:56 +00008190 CurBlock->TheDecl->setParams(Params.data(), Params.size());
Douglas Gregor82aa7132010-11-01 18:37:59 +00008191 CheckParmsForFunctionDef(CurBlock->TheDecl->param_begin(),
8192 CurBlock->TheDecl->param_end(),
8193 /*CheckParameterNames=*/false);
8194 }
8195
John McCall82dc0092010-06-04 11:21:44 +00008196 // Finally we can process decl attributes.
Douglas Gregor9cdda0c2009-06-17 21:51:59 +00008197 ProcessDeclAttributes(CurScope, CurBlock->TheDecl, ParamInfo);
John McCall053f4bd2010-03-22 09:20:08 +00008198
John McCallc71a4912010-06-04 19:02:56 +00008199 if (!isVariadic && CurBlock->TheDecl->getAttr<SentinelAttr>()) {
John McCall82dc0092010-06-04 11:21:44 +00008200 Diag(ParamInfo.getAttributes()->getLoc(),
8201 diag::warn_attribute_sentinel_not_variadic) << 1;
8202 // FIXME: remove the attribute.
8203 }
8204
8205 // Put the parameter variables in scope. We can bail out immediately
8206 // if we don't have any.
John McCallc71a4912010-06-04 19:02:56 +00008207 if (Params.empty())
John McCall82dc0092010-06-04 11:21:44 +00008208 return;
8209
John McCall053f4bd2010-03-22 09:20:08 +00008210 bool ShouldCheckShadow =
8211 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored;
8212
Steve Naroff090276f2008-10-10 01:28:17 +00008213 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(),
John McCall7a9813c2010-01-22 00:28:27 +00008214 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) {
8215 (*AI)->setOwningFunction(CurBlock->TheDecl);
8216
Steve Naroff090276f2008-10-10 01:28:17 +00008217 // If this has an identifier, add it to the scope stack.
John McCall053f4bd2010-03-22 09:20:08 +00008218 if ((*AI)->getIdentifier()) {
8219 if (ShouldCheckShadow)
8220 CheckShadow(CurBlock->TheScope, *AI);
8221
Steve Naroff090276f2008-10-10 01:28:17 +00008222 PushOnScopeChains(*AI, CurBlock->TheScope);
John McCall053f4bd2010-03-22 09:20:08 +00008223 }
John McCall7a9813c2010-01-22 00:28:27 +00008224 }
Steve Naroff4eb206b2008-09-03 18:15:37 +00008225}
8226
8227/// ActOnBlockError - If there is an error parsing a block, this callback
8228/// is invoked to pop the information about the block from the action impl.
8229void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) {
Steve Naroff4eb206b2008-09-03 18:15:37 +00008230 // Pop off CurBlock, handle nested blocks.
Chris Lattner5c59e2b2009-04-21 22:38:46 +00008231 PopDeclContext();
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008232 PopFunctionOrBlockScope();
Steve Naroff4eb206b2008-09-03 18:15:37 +00008233}
8234
8235/// ActOnBlockStmtExpr - This is called when the body of a block statement
8236/// literal was successfully completed. ^(int x){...}
John McCall60d7b3a2010-08-24 06:29:42 +00008237ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc,
John McCall9ae2f072010-08-23 23:25:46 +00008238 Stmt *Body, Scope *CurScope) {
Chris Lattner9af55002009-03-27 04:18:06 +00008239 // If blocks are disabled, emit an error.
8240 if (!LangOpts.Blocks)
8241 Diag(CaretLoc, diag::err_blocks_disable);
Mike Stump1eb44332009-09-09 15:08:12 +00008242
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008243 BlockScopeInfo *BSI = cast<BlockScopeInfo>(FunctionScopes.back());
Fariborz Jahaniana729da22010-07-09 18:44:02 +00008244
Steve Naroff090276f2008-10-10 01:28:17 +00008245 PopDeclContext();
8246
Steve Naroff4eb206b2008-09-03 18:15:37 +00008247 QualType RetTy = Context.VoidTy;
Fariborz Jahanian7d5c74e2009-06-19 23:37:08 +00008248 if (!BSI->ReturnType.isNull())
8249 RetTy = BSI->ReturnType;
Mike Stumpeed9cac2009-02-19 03:04:26 +00008250
Mike Stump56925862009-07-28 22:04:01 +00008251 bool NoReturn = BSI->TheDecl->getAttr<NoReturnAttr>();
Steve Naroff4eb206b2008-09-03 18:15:37 +00008252 QualType BlockTy;
John McCallc71a4912010-06-04 19:02:56 +00008253
8254 // If the user wrote a function type in some form, try to use that.
8255 if (!BSI->FunctionType.isNull()) {
8256 const FunctionType *FTy = BSI->FunctionType->getAs<FunctionType>();
8257
8258 FunctionType::ExtInfo Ext = FTy->getExtInfo();
8259 if (NoReturn && !Ext.getNoReturn()) Ext = Ext.withNoReturn(true);
8260
8261 // Turn protoless block types into nullary block types.
8262 if (isa<FunctionNoProtoType>(FTy)) {
8263 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0,
8264 false, false, 0, 0, Ext);
8265
8266 // Otherwise, if we don't need to change anything about the function type,
8267 // preserve its sugar structure.
8268 } else if (FTy->getResultType() == RetTy &&
8269 (!NoReturn || FTy->getNoReturnAttr())) {
8270 BlockTy = BSI->FunctionType;
8271
8272 // Otherwise, make the minimal modifications to the function type.
8273 } else {
8274 const FunctionProtoType *FPT = cast<FunctionProtoType>(FTy);
8275 BlockTy = Context.getFunctionType(RetTy,
8276 FPT->arg_type_begin(),
8277 FPT->getNumArgs(),
8278 FPT->isVariadic(),
8279 /*quals*/ 0,
8280 FPT->hasExceptionSpec(),
8281 FPT->hasAnyExceptionSpec(),
8282 FPT->getNumExceptions(),
8283 FPT->exception_begin(),
8284 Ext);
8285 }
8286
8287 // If we don't have a function type, just build one from nothing.
8288 } else {
8289 BlockTy = Context.getFunctionType(RetTy, 0, 0, false, 0,
8290 false, false, 0, 0,
8291 FunctionType::ExtInfo(NoReturn, 0, CC_Default));
8292 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008293
John McCallc71a4912010-06-04 19:02:56 +00008294 DiagnoseUnusedParameters(BSI->TheDecl->param_begin(),
8295 BSI->TheDecl->param_end());
Steve Naroff4eb206b2008-09-03 18:15:37 +00008296 BlockTy = Context.getBlockPointerType(BlockTy);
Mike Stumpeed9cac2009-02-19 03:04:26 +00008297
Chris Lattner17a78302009-04-19 05:28:12 +00008298 // If needed, diagnose invalid gotos and switches in the block.
John McCall781472f2010-08-25 08:40:02 +00008299 if (getCurFunction()->NeedsScopeChecking() && !hasAnyErrorsInThisFunction())
John McCall9ae2f072010-08-23 23:25:46 +00008300 DiagnoseInvalidJumps(cast<CompoundStmt>(Body));
Mike Stump1eb44332009-09-09 15:08:12 +00008301
John McCall9ae2f072010-08-23 23:25:46 +00008302 BSI->TheDecl->setBody(cast<CompoundStmt>(Body));
Mike Stumpa3899eb2010-01-19 23:08:01 +00008303
8304 bool Good = true;
8305 // Check goto/label use.
8306 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator
8307 I = BSI->LabelMap.begin(), E = BSI->LabelMap.end(); I != E; ++I) {
8308 LabelStmt *L = I->second;
8309
8310 // Verify that we have no forward references left. If so, there was a goto
8311 // or address of a label taken, but no definition of it.
Argyrios Kyrtzidis355a9fe2010-09-19 21:21:25 +00008312 if (L->getSubStmt() != 0) {
8313 if (!L->isUsed())
8314 Diag(L->getIdentLoc(), diag::warn_unused_label) << L->getName();
Mike Stumpa3899eb2010-01-19 23:08:01 +00008315 continue;
Argyrios Kyrtzidis355a9fe2010-09-19 21:21:25 +00008316 }
Mike Stumpa3899eb2010-01-19 23:08:01 +00008317
8318 // Emit error.
8319 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName();
8320 Good = false;
8321 }
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008322 if (!Good) {
8323 PopFunctionOrBlockScope();
Mike Stumpa3899eb2010-01-19 23:08:01 +00008324 return ExprError();
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008325 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008326
John McCalle0054f62010-08-25 05:56:39 +00008327 BlockExpr *Result = new (Context) BlockExpr(BSI->TheDecl, BlockTy,
8328 BSI->hasBlockDeclRefExprs);
8329
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00008330 // Issue any analysis-based warnings.
Ted Kremenekd064fdc2010-03-23 00:13:23 +00008331 const sema::AnalysisBasedWarnings::Policy &WP =
8332 AnalysisWarnings.getDefaultPolicy();
John McCalle0054f62010-08-25 05:56:39 +00008333 AnalysisWarnings.IssueWarnings(WP, Result);
Ted Kremenekdbdbaaf2010-03-20 21:06:02 +00008334
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008335 PopFunctionOrBlockScope();
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00008336 return Owned(Result);
Steve Naroff4eb206b2008-09-03 18:15:37 +00008337}
8338
John McCall60d7b3a2010-08-24 06:29:42 +00008339ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc,
John McCallb3d87482010-08-24 05:47:05 +00008340 Expr *expr, ParsedType type,
Sebastian Redlf53597f2009-03-15 17:47:39 +00008341 SourceLocation RPLoc) {
Abramo Bagnara2cad9002010-08-10 10:06:15 +00008342 TypeSourceInfo *TInfo;
8343 QualType T = GetTypeFromParser(type, &TInfo);
John McCall9ae2f072010-08-23 23:25:46 +00008344 return BuildVAArgExpr(BuiltinLoc, expr, TInfo, RPLoc);
Abramo Bagnara2cad9002010-08-10 10:06:15 +00008345}
8346
John McCall60d7b3a2010-08-24 06:29:42 +00008347ExprResult Sema::BuildVAArgExpr(SourceLocation BuiltinLoc,
John McCallf89e55a2010-11-18 06:31:45 +00008348 Expr *E, TypeSourceInfo *TInfo,
8349 SourceLocation RPLoc) {
Chris Lattner0d20b8a2009-04-05 15:49:53 +00008350 Expr *OrigExpr = E;
Mike Stump1eb44332009-09-09 15:08:12 +00008351
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008352 // Get the va_list type
8353 QualType VaListType = Context.getBuiltinVaListType();
Eli Friedman5c091ba2009-05-16 12:46:54 +00008354 if (VaListType->isArrayType()) {
8355 // Deal with implicit array decay; for example, on x86-64,
8356 // va_list is an array, but it's supposed to decay to
8357 // a pointer for va_arg.
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008358 VaListType = Context.getArrayDecayedType(VaListType);
Eli Friedman5c091ba2009-05-16 12:46:54 +00008359 // Make sure the input expression also decays appropriately.
8360 UsualUnaryConversions(E);
8361 } else {
8362 // Otherwise, the va_list argument must be an l-value because
8363 // it is modified by va_arg.
Mike Stump1eb44332009-09-09 15:08:12 +00008364 if (!E->isTypeDependent() &&
Douglas Gregordd027302009-05-19 23:10:31 +00008365 CheckForModifiableLvalue(E, BuiltinLoc, *this))
Eli Friedman5c091ba2009-05-16 12:46:54 +00008366 return ExprError();
8367 }
Eli Friedmanc34bcde2008-08-09 23:32:40 +00008368
Douglas Gregordd027302009-05-19 23:10:31 +00008369 if (!E->isTypeDependent() &&
8370 !Context.hasSameType(VaListType, E->getType())) {
Sebastian Redlf53597f2009-03-15 17:47:39 +00008371 return ExprError(Diag(E->getLocStart(),
8372 diag::err_first_argument_to_va_arg_not_of_type_va_list)
Chris Lattner0d20b8a2009-04-05 15:49:53 +00008373 << OrigExpr->getType() << E->getSourceRange());
Chris Lattner9dc8f192009-04-05 00:59:53 +00008374 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008375
Eli Friedmanb1d796d2009-03-23 00:24:07 +00008376 // FIXME: Check that type is complete/non-abstract
Anders Carlsson7c50aca2007-10-15 20:28:48 +00008377 // FIXME: Warn if a non-POD type is passed in.
Mike Stumpeed9cac2009-02-19 03:04:26 +00008378
Abramo Bagnara2cad9002010-08-10 10:06:15 +00008379 QualType T = TInfo->getType().getNonLValueExprType(Context);
8380 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, TInfo, RPLoc, T));
Anders Carlsson7c50aca2007-10-15 20:28:48 +00008381}
8382
John McCall60d7b3a2010-08-24 06:29:42 +00008383ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) {
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008384 // The type of __null will be int or long, depending on the size of
8385 // pointers on the target.
8386 QualType Ty;
8387 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth())
8388 Ty = Context.IntTy;
8389 else
8390 Ty = Context.LongTy;
8391
Sebastian Redlf53597f2009-03-15 17:47:39 +00008392 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc));
Douglas Gregor2d8b2732008-11-29 04:51:27 +00008393}
8394
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00008395static void MakeObjCStringLiteralFixItHint(Sema& SemaRef, QualType DstType,
Douglas Gregor849b2432010-03-31 17:46:05 +00008396 Expr *SrcExpr, FixItHint &Hint) {
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008397 if (!SemaRef.getLangOptions().ObjC1)
8398 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008399
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008400 const ObjCObjectPointerType *PT = DstType->getAs<ObjCObjectPointerType>();
8401 if (!PT)
8402 return;
8403
8404 // Check if the destination is of type 'id'.
8405 if (!PT->isObjCIdType()) {
8406 // Check if the destination is the 'NSString' interface.
8407 const ObjCInterfaceDecl *ID = PT->getInterfaceDecl();
8408 if (!ID || !ID->getIdentifier()->isStr("NSString"))
8409 return;
8410 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008411
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008412 // Strip off any parens and casts.
8413 StringLiteral *SL = dyn_cast<StringLiteral>(SrcExpr->IgnoreParenCasts());
8414 if (!SL || SL->isWide())
8415 return;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008416
Douglas Gregor849b2432010-03-31 17:46:05 +00008417 Hint = FixItHint::CreateInsertion(SL->getLocStart(), "@");
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008418}
8419
Chris Lattner5cf216b2008-01-04 18:04:52 +00008420bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
8421 SourceLocation Loc,
8422 QualType DstType, QualType SrcType,
Douglas Gregora41a8c52010-04-22 00:20:18 +00008423 Expr *SrcExpr, AssignmentAction Action,
8424 bool *Complained) {
8425 if (Complained)
8426 *Complained = false;
8427
Chris Lattner5cf216b2008-01-04 18:04:52 +00008428 // Decode the result (notice that AST's are still created for extensions).
8429 bool isInvalid = false;
8430 unsigned DiagKind;
Douglas Gregor849b2432010-03-31 17:46:05 +00008431 FixItHint Hint;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008432
Chris Lattner5cf216b2008-01-04 18:04:52 +00008433 switch (ConvTy) {
8434 default: assert(0 && "Unknown conversion type");
8435 case Compatible: return false;
Chris Lattnerb7b61152008-01-04 18:22:42 +00008436 case PointerToInt:
Chris Lattner5cf216b2008-01-04 18:04:52 +00008437 DiagKind = diag::ext_typecheck_convert_pointer_int;
8438 break;
Chris Lattnerb7b61152008-01-04 18:22:42 +00008439 case IntToPointer:
8440 DiagKind = diag::ext_typecheck_convert_int_pointer;
8441 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008442 case IncompatiblePointer:
Douglas Gregor849b2432010-03-31 17:46:05 +00008443 MakeObjCStringLiteralFixItHint(*this, DstType, SrcExpr, Hint);
Chris Lattner5cf216b2008-01-04 18:04:52 +00008444 DiagKind = diag::ext_typecheck_convert_incompatible_pointer;
8445 break;
Eli Friedmanf05c05d2009-03-22 23:59:44 +00008446 case IncompatiblePointerSign:
8447 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign;
8448 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008449 case FunctionVoidPointer:
8450 DiagKind = diag::ext_typecheck_convert_pointer_void_func;
8451 break;
8452 case CompatiblePointerDiscardsQualifiers:
Douglas Gregor77a52232008-09-12 00:47:35 +00008453 // If the qualifiers lost were because we were applying the
8454 // (deprecated) C++ conversion from a string literal to a char*
8455 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME:
8456 // Ideally, this check would be performed in
8457 // CheckPointerTypesForAssignment. However, that would require a
8458 // bit of refactoring (so that the second argument is an
8459 // expression, rather than a type), which should be done as part
8460 // of a larger effort to fix CheckPointerTypesForAssignment for
8461 // C++ semantics.
8462 if (getLangOptions().CPlusPlus &&
8463 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType))
8464 return false;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008465 DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
8466 break;
Sean Huntc9132b62009-11-08 07:46:34 +00008467 case IncompatibleNestedPointerQualifiers:
Fariborz Jahanian3451e922009-11-09 22:16:37 +00008468 DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
Fariborz Jahanian36a862f2009-11-07 20:20:40 +00008469 break;
Steve Naroff1c7d0672008-09-04 15:10:53 +00008470 case IntToBlockPointer:
8471 DiagKind = diag::err_int_to_block_pointer;
8472 break;
8473 case IncompatibleBlockPointer:
Mike Stump25efa102009-04-21 22:51:42 +00008474 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer;
Steve Naroff1c7d0672008-09-04 15:10:53 +00008475 break;
Steve Naroff39579072008-10-14 22:18:38 +00008476 case IncompatibleObjCQualifiedId:
Mike Stumpeed9cac2009-02-19 03:04:26 +00008477 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since
Steve Naroff39579072008-10-14 22:18:38 +00008478 // it can give a more specific diagnostic.
8479 DiagKind = diag::warn_incompatible_qualified_id;
8480 break;
Anders Carlssonb0f90cc2009-01-30 23:17:46 +00008481 case IncompatibleVectors:
8482 DiagKind = diag::warn_incompatible_vectors;
8483 break;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008484 case Incompatible:
8485 DiagKind = diag::err_typecheck_convert_incompatible;
8486 isInvalid = true;
8487 break;
8488 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008489
Douglas Gregord4eea832010-04-09 00:35:39 +00008490 QualType FirstType, SecondType;
8491 switch (Action) {
8492 case AA_Assigning:
8493 case AA_Initializing:
8494 // The destination type comes first.
8495 FirstType = DstType;
8496 SecondType = SrcType;
8497 break;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00008498
Douglas Gregord4eea832010-04-09 00:35:39 +00008499 case AA_Returning:
8500 case AA_Passing:
8501 case AA_Converting:
8502 case AA_Sending:
8503 case AA_Casting:
8504 // The source type comes first.
8505 FirstType = SrcType;
8506 SecondType = DstType;
8507 break;
8508 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00008509
Douglas Gregord4eea832010-04-09 00:35:39 +00008510 Diag(Loc, DiagKind) << FirstType << SecondType << Action
Anders Carlssonb76cd3d2009-11-10 04:46:30 +00008511 << SrcExpr->getSourceRange() << Hint;
Douglas Gregora41a8c52010-04-22 00:20:18 +00008512 if (Complained)
8513 *Complained = true;
Chris Lattner5cf216b2008-01-04 18:04:52 +00008514 return isInvalid;
8515}
Anders Carlssone21555e2008-11-30 19:50:32 +00008516
Chris Lattner3bf68932009-04-25 21:59:05 +00008517bool Sema::VerifyIntegerConstantExpression(const Expr *E, llvm::APSInt *Result){
Eli Friedman3b5ccca2009-04-25 22:26:58 +00008518 llvm::APSInt ICEResult;
8519 if (E->isIntegerConstantExpr(ICEResult, Context)) {
8520 if (Result)
8521 *Result = ICEResult;
8522 return false;
8523 }
8524
Anders Carlssone21555e2008-11-30 19:50:32 +00008525 Expr::EvalResult EvalResult;
8526
Mike Stumpeed9cac2009-02-19 03:04:26 +00008527 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() ||
Anders Carlssone21555e2008-11-30 19:50:32 +00008528 EvalResult.HasSideEffects) {
8529 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange();
8530
8531 if (EvalResult.Diag) {
8532 // We only show the note if it's not the usual "invalid subexpression"
8533 // or if it's actually in a subexpression.
8534 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice ||
8535 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens())
8536 Diag(EvalResult.DiagLoc, EvalResult.Diag);
8537 }
Mike Stumpeed9cac2009-02-19 03:04:26 +00008538
Anders Carlssone21555e2008-11-30 19:50:32 +00008539 return true;
8540 }
8541
Eli Friedman3b5ccca2009-04-25 22:26:58 +00008542 Diag(E->getExprLoc(), diag::ext_expr_not_ice) <<
8543 E->getSourceRange();
Anders Carlssone21555e2008-11-30 19:50:32 +00008544
Eli Friedman3b5ccca2009-04-25 22:26:58 +00008545 if (EvalResult.Diag &&
8546 Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored)
8547 Diag(EvalResult.DiagLoc, EvalResult.Diag);
Mike Stumpeed9cac2009-02-19 03:04:26 +00008548
Anders Carlssone21555e2008-11-30 19:50:32 +00008549 if (Result)
8550 *Result = EvalResult.Val.getInt();
8551 return false;
8552}
Douglas Gregore0762c92009-06-19 23:52:42 +00008553
Douglas Gregor2afce722009-11-26 00:44:06 +00008554void
Mike Stump1eb44332009-09-09 15:08:12 +00008555Sema::PushExpressionEvaluationContext(ExpressionEvaluationContext NewContext) {
Douglas Gregor2afce722009-11-26 00:44:06 +00008556 ExprEvalContexts.push_back(
8557 ExpressionEvaluationContextRecord(NewContext, ExprTemporaries.size()));
Douglas Gregorac7610d2009-06-22 20:57:11 +00008558}
8559
Mike Stump1eb44332009-09-09 15:08:12 +00008560void
Douglas Gregor2afce722009-11-26 00:44:06 +00008561Sema::PopExpressionEvaluationContext() {
8562 // Pop the current expression evaluation context off the stack.
8563 ExpressionEvaluationContextRecord Rec = ExprEvalContexts.back();
8564 ExprEvalContexts.pop_back();
Douglas Gregorac7610d2009-06-22 20:57:11 +00008565
Douglas Gregor06d33692009-12-12 07:57:52 +00008566 if (Rec.Context == PotentiallyPotentiallyEvaluated) {
8567 if (Rec.PotentiallyReferenced) {
8568 // Mark any remaining declarations in the current position of the stack
8569 // as "referenced". If they were not meant to be referenced, semantic
8570 // analysis would have eliminated them (e.g., in ActOnCXXTypeId).
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008571 for (PotentiallyReferencedDecls::iterator
Douglas Gregor06d33692009-12-12 07:57:52 +00008572 I = Rec.PotentiallyReferenced->begin(),
8573 IEnd = Rec.PotentiallyReferenced->end();
8574 I != IEnd; ++I)
8575 MarkDeclarationReferenced(I->first, I->second);
8576 }
8577
8578 if (Rec.PotentiallyDiagnosed) {
8579 // Emit any pending diagnostics.
8580 for (PotentiallyEmittedDiagnostics::iterator
8581 I = Rec.PotentiallyDiagnosed->begin(),
8582 IEnd = Rec.PotentiallyDiagnosed->end();
8583 I != IEnd; ++I)
8584 Diag(I->first, I->second);
8585 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008586 }
Douglas Gregor2afce722009-11-26 00:44:06 +00008587
8588 // When are coming out of an unevaluated context, clear out any
8589 // temporaries that we may have created as part of the evaluation of
8590 // the expression in that context: they aren't relevant because they
8591 // will never be constructed.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008592 if (Rec.Context == Unevaluated &&
Douglas Gregor2afce722009-11-26 00:44:06 +00008593 ExprTemporaries.size() > Rec.NumTemporaries)
8594 ExprTemporaries.erase(ExprTemporaries.begin() + Rec.NumTemporaries,
8595 ExprTemporaries.end());
8596
8597 // Destroy the popped expression evaluation record.
8598 Rec.Destroy();
Douglas Gregorac7610d2009-06-22 20:57:11 +00008599}
Douglas Gregore0762c92009-06-19 23:52:42 +00008600
8601/// \brief Note that the given declaration was referenced in the source code.
8602///
8603/// This routine should be invoke whenever a given declaration is referenced
8604/// in the source code, and where that reference occurred. If this declaration
8605/// reference means that the the declaration is used (C++ [basic.def.odr]p2,
8606/// C99 6.9p3), then the declaration will be marked as used.
8607///
8608/// \param Loc the location where the declaration was referenced.
8609///
8610/// \param D the declaration that has been referenced by the source code.
8611void Sema::MarkDeclarationReferenced(SourceLocation Loc, Decl *D) {
8612 assert(D && "No declaration?");
Mike Stump1eb44332009-09-09 15:08:12 +00008613
Douglas Gregorc070cc62010-06-17 23:14:26 +00008614 if (D->isUsed(false))
Douglas Gregord7f37bf2009-06-22 23:06:13 +00008615 return;
Mike Stump1eb44332009-09-09 15:08:12 +00008616
Douglas Gregorb5352cf2009-10-08 21:35:42 +00008617 // Mark a parameter or variable declaration "used", regardless of whether we're in a
8618 // template or not. The reason for this is that unevaluated expressions
8619 // (e.g. (void)sizeof()) constitute a use for warning purposes (-Wunused-variables and
8620 // -Wunused-parameters)
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008621 if (isa<ParmVarDecl>(D) ||
Douglas Gregorfc2ca562010-04-07 20:29:57 +00008622 (isa<VarDecl>(D) && D->getDeclContext()->isFunctionOrMethod())) {
Anders Carlsson2127ecc2010-10-22 23:37:08 +00008623 D->setUsed();
Douglas Gregorfc2ca562010-04-07 20:29:57 +00008624 return;
8625 }
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00008626
Douglas Gregorfc2ca562010-04-07 20:29:57 +00008627 if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D))
8628 return;
Sean Hunt1e3f5ba2010-04-28 23:02:27 +00008629
Douglas Gregore0762c92009-06-19 23:52:42 +00008630 // Do not mark anything as "used" within a dependent context; wait for
8631 // an instantiation.
8632 if (CurContext->isDependentContext())
8633 return;
Mike Stump1eb44332009-09-09 15:08:12 +00008634
Douglas Gregor2afce722009-11-26 00:44:06 +00008635 switch (ExprEvalContexts.back().Context) {
Douglas Gregorac7610d2009-06-22 20:57:11 +00008636 case Unevaluated:
8637 // We are in an expression that is not potentially evaluated; do nothing.
8638 return;
Mike Stump1eb44332009-09-09 15:08:12 +00008639
Douglas Gregorac7610d2009-06-22 20:57:11 +00008640 case PotentiallyEvaluated:
8641 // We are in a potentially-evaluated expression, so this declaration is
8642 // "used"; handle this below.
8643 break;
Mike Stump1eb44332009-09-09 15:08:12 +00008644
Douglas Gregorac7610d2009-06-22 20:57:11 +00008645 case PotentiallyPotentiallyEvaluated:
8646 // We are in an expression that may be potentially evaluated; queue this
8647 // declaration reference until we know whether the expression is
8648 // potentially evaluated.
Douglas Gregor2afce722009-11-26 00:44:06 +00008649 ExprEvalContexts.back().addReferencedDecl(Loc, D);
Douglas Gregorac7610d2009-06-22 20:57:11 +00008650 return;
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00008651
8652 case PotentiallyEvaluatedIfUsed:
8653 // Referenced declarations will only be used if the construct in the
8654 // containing expression is used.
8655 return;
Douglas Gregorac7610d2009-06-22 20:57:11 +00008656 }
Mike Stump1eb44332009-09-09 15:08:12 +00008657
Douglas Gregore0762c92009-06-19 23:52:42 +00008658 // Note that this declaration has been used.
Fariborz Jahanianb7f4cc02009-06-22 17:30:33 +00008659 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
Fariborz Jahanian485f0872009-06-22 23:34:40 +00008660 unsigned TypeQuals;
Fariborz Jahanian05a5c452009-06-22 20:37:23 +00008661 if (Constructor->isImplicit() && Constructor->isDefaultConstructor()) {
Chandler Carruth4e6fbce2010-08-23 07:55:51 +00008662 if (Constructor->getParent()->hasTrivialConstructor())
8663 return;
8664 if (!Constructor->isUsed(false))
8665 DefineImplicitDefaultConstructor(Loc, Constructor);
Mike Stump1eb44332009-09-09 15:08:12 +00008666 } else if (Constructor->isImplicit() &&
Douglas Gregor9e9199d2009-12-22 00:34:07 +00008667 Constructor->isCopyConstructor(TypeQuals)) {
Douglas Gregorc070cc62010-06-17 23:14:26 +00008668 if (!Constructor->isUsed(false))
Fariborz Jahanian485f0872009-06-22 23:34:40 +00008669 DefineImplicitCopyConstructor(Loc, Constructor, TypeQuals);
8670 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008671
Douglas Gregor6fb745b2010-05-13 16:44:06 +00008672 MarkVTableUsed(Loc, Constructor->getParent());
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +00008673 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
Douglas Gregorc070cc62010-06-17 23:14:26 +00008674 if (Destructor->isImplicit() && !Destructor->isUsed(false))
Fariborz Jahanian8d2b3562009-06-26 23:49:16 +00008675 DefineImplicitDestructor(Loc, Destructor);
Douglas Gregor6fb745b2010-05-13 16:44:06 +00008676 if (Destructor->isVirtual())
8677 MarkVTableUsed(Loc, Destructor->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00008678 } else if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(D)) {
8679 if (MethodDecl->isImplicit() && MethodDecl->isOverloadedOperator() &&
8680 MethodDecl->getOverloadedOperator() == OO_Equal) {
Douglas Gregorc070cc62010-06-17 23:14:26 +00008681 if (!MethodDecl->isUsed(false))
Douglas Gregor39957dc2010-05-01 15:04:51 +00008682 DefineImplicitCopyAssignment(Loc, MethodDecl);
Douglas Gregor6fb745b2010-05-13 16:44:06 +00008683 } else if (MethodDecl->isVirtual())
8684 MarkVTableUsed(Loc, MethodDecl->getParent());
Fariborz Jahanianc75bc2d2009-06-25 21:45:19 +00008685 }
Fariborz Jahanianf5ed9e02009-06-24 22:09:44 +00008686 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) {
Mike Stump1eb44332009-09-09 15:08:12 +00008687 // Implicit instantiation of function templates and member functions of
Douglas Gregor1637be72009-06-26 00:10:03 +00008688 // class templates.
Douglas Gregor6cfacfe2010-05-17 17:34:56 +00008689 if (Function->isImplicitlyInstantiable()) {
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00008690 bool AlreadyInstantiated = false;
8691 if (FunctionTemplateSpecializationInfo *SpecInfo
8692 = Function->getTemplateSpecializationInfo()) {
8693 if (SpecInfo->getPointOfInstantiation().isInvalid())
8694 SpecInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008695 else if (SpecInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +00008696 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00008697 AlreadyInstantiated = true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008698 } else if (MemberSpecializationInfo *MSInfo
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00008699 = Function->getMemberSpecializationInfo()) {
8700 if (MSInfo->getPointOfInstantiation().isInvalid())
8701 MSInfo->setPointOfInstantiation(Loc);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008702 else if (MSInfo->getTemplateSpecializationKind()
Douglas Gregor3b846b62009-10-27 20:53:28 +00008703 == TSK_ImplicitInstantiation)
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00008704 AlreadyInstantiated = true;
8705 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008706
Douglas Gregor60406be2010-01-16 22:29:39 +00008707 if (!AlreadyInstantiated) {
8708 if (isa<CXXRecordDecl>(Function->getDeclContext()) &&
8709 cast<CXXRecordDecl>(Function->getDeclContext())->isLocalClass())
8710 PendingLocalImplicitInstantiations.push_back(std::make_pair(Function,
8711 Loc));
8712 else
Chandler Carruth62c78d52010-08-25 08:44:16 +00008713 PendingInstantiations.push_back(std::make_pair(Function, Loc));
Douglas Gregor60406be2010-01-16 22:29:39 +00008714 }
Gabor Greif40181c42010-08-28 00:16:06 +00008715 } else // Walk redefinitions, as some of them may be instantiable.
8716 for (FunctionDecl::redecl_iterator i(Function->redecls_begin()),
8717 e(Function->redecls_end()); i != e; ++i) {
Gabor Greifbe9ebe32010-08-28 01:58:12 +00008718 if (!i->isUsed(false) && i->isImplicitlyInstantiable())
Gabor Greif40181c42010-08-28 00:16:06 +00008719 MarkDeclarationReferenced(Loc, *i);
8720 }
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008721
Douglas Gregore0762c92009-06-19 23:52:42 +00008722 // FIXME: keep track of references to static functions
Argyrios Kyrtzidis58b52592010-08-25 10:34:54 +00008723
8724 // Recursive functions should be marked when used from another function.
8725 if (CurContext != Function)
8726 Function->setUsed(true);
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008727
Douglas Gregore0762c92009-06-19 23:52:42 +00008728 return;
Douglas Gregord7f37bf2009-06-22 23:06:13 +00008729 }
Mike Stump1eb44332009-09-09 15:08:12 +00008730
Douglas Gregore0762c92009-06-19 23:52:42 +00008731 if (VarDecl *Var = dyn_cast<VarDecl>(D)) {
Douglas Gregor7caa6822009-07-24 20:34:43 +00008732 // Implicit instantiation of static data members of class templates.
Mike Stump1eb44332009-09-09 15:08:12 +00008733 if (Var->isStaticDataMember() &&
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00008734 Var->getInstantiatedFromStaticDataMember()) {
8735 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo();
8736 assert(MSInfo && "Missing member specialization information?");
8737 if (MSInfo->getPointOfInstantiation().isInvalid() &&
8738 MSInfo->getTemplateSpecializationKind()== TSK_ImplicitInstantiation) {
8739 MSInfo->setPointOfInstantiation(Loc);
Chandler Carruth62c78d52010-08-25 08:44:16 +00008740 PendingInstantiations.push_back(std::make_pair(Var, Loc));
Douglas Gregorb3ae4fc2009-10-12 20:18:28 +00008741 }
8742 }
Mike Stump1eb44332009-09-09 15:08:12 +00008743
Douglas Gregore0762c92009-06-19 23:52:42 +00008744 // FIXME: keep track of references to static data?
Douglas Gregor7caa6822009-07-24 20:34:43 +00008745
Douglas Gregore0762c92009-06-19 23:52:42 +00008746 D->setUsed(true);
Douglas Gregor7caa6822009-07-24 20:34:43 +00008747 return;
Sam Weinigcce6ebc2009-09-11 03:29:30 +00008748 }
Douglas Gregore0762c92009-06-19 23:52:42 +00008749}
Anders Carlsson8c8d9192009-10-09 23:51:55 +00008750
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008751namespace {
Chandler Carruthdfc35e32010-06-09 08:17:30 +00008752 // Mark all of the declarations referenced
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008753 // FIXME: Not fully implemented yet! We need to have a better understanding
Chandler Carruthdfc35e32010-06-09 08:17:30 +00008754 // of when we're entering
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008755 class MarkReferencedDecls : public RecursiveASTVisitor<MarkReferencedDecls> {
8756 Sema &S;
8757 SourceLocation Loc;
Chandler Carruthdfc35e32010-06-09 08:17:30 +00008758
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008759 public:
8760 typedef RecursiveASTVisitor<MarkReferencedDecls> Inherited;
Chandler Carruthdfc35e32010-06-09 08:17:30 +00008761
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008762 MarkReferencedDecls(Sema &S, SourceLocation Loc) : S(S), Loc(Loc) { }
Chandler Carruthdfc35e32010-06-09 08:17:30 +00008763
8764 bool TraverseTemplateArgument(const TemplateArgument &Arg);
8765 bool TraverseRecordType(RecordType *T);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008766 };
8767}
8768
Chandler Carruthdfc35e32010-06-09 08:17:30 +00008769bool MarkReferencedDecls::TraverseTemplateArgument(
8770 const TemplateArgument &Arg) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008771 if (Arg.getKind() == TemplateArgument::Declaration) {
8772 S.MarkDeclarationReferenced(Loc, Arg.getAsDecl());
8773 }
Chandler Carruthdfc35e32010-06-09 08:17:30 +00008774
8775 return Inherited::TraverseTemplateArgument(Arg);
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008776}
8777
Chandler Carruthdfc35e32010-06-09 08:17:30 +00008778bool MarkReferencedDecls::TraverseRecordType(RecordType *T) {
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008779 if (ClassTemplateSpecializationDecl *Spec
8780 = dyn_cast<ClassTemplateSpecializationDecl>(T->getDecl())) {
8781 const TemplateArgumentList &Args = Spec->getTemplateArgs();
Douglas Gregor910f8002010-11-07 23:05:16 +00008782 return TraverseTemplateArguments(Args.data(), Args.size());
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008783 }
8784
Chandler Carruthe3e210c2010-06-10 10:31:57 +00008785 return true;
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008786}
8787
8788void Sema::MarkDeclarationsReferencedInType(SourceLocation Loc, QualType T) {
8789 MarkReferencedDecls Marker(*this, Loc);
Chandler Carruthdfc35e32010-06-09 08:17:30 +00008790 Marker.TraverseType(Context.getCanonicalType(T));
Douglas Gregorb4eeaff2010-05-07 23:12:07 +00008791}
8792
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00008793namespace {
8794 /// \brief Helper class that marks all of the declarations referenced by
8795 /// potentially-evaluated subexpressions as "referenced".
8796 class EvaluatedExprMarker : public EvaluatedExprVisitor<EvaluatedExprMarker> {
8797 Sema &S;
8798
8799 public:
8800 typedef EvaluatedExprVisitor<EvaluatedExprMarker> Inherited;
8801
8802 explicit EvaluatedExprMarker(Sema &S) : Inherited(S.Context), S(S) { }
8803
8804 void VisitDeclRefExpr(DeclRefExpr *E) {
8805 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
8806 }
8807
8808 void VisitMemberExpr(MemberExpr *E) {
8809 S.MarkDeclarationReferenced(E->getMemberLoc(), E->getMemberDecl());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00008810 Inherited::VisitMemberExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00008811 }
8812
8813 void VisitCXXNewExpr(CXXNewExpr *E) {
8814 if (E->getConstructor())
8815 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
8816 if (E->getOperatorNew())
8817 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorNew());
8818 if (E->getOperatorDelete())
8819 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00008820 Inherited::VisitCXXNewExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00008821 }
8822
8823 void VisitCXXDeleteExpr(CXXDeleteExpr *E) {
8824 if (E->getOperatorDelete())
8825 S.MarkDeclarationReferenced(E->getLocStart(), E->getOperatorDelete());
Douglas Gregor5833b0b2010-09-14 22:55:20 +00008826 QualType Destroyed = S.Context.getBaseElementType(E->getDestroyedType());
8827 if (const RecordType *DestroyedRec = Destroyed->getAs<RecordType>()) {
8828 CXXRecordDecl *Record = cast<CXXRecordDecl>(DestroyedRec->getDecl());
8829 S.MarkDeclarationReferenced(E->getLocStart(),
8830 S.LookupDestructor(Record));
8831 }
8832
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00008833 Inherited::VisitCXXDeleteExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00008834 }
8835
8836 void VisitCXXConstructExpr(CXXConstructExpr *E) {
8837 S.MarkDeclarationReferenced(E->getLocStart(), E->getConstructor());
Douglas Gregor4fcf5b22010-09-11 23:32:50 +00008838 Inherited::VisitCXXConstructExpr(E);
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00008839 }
8840
8841 void VisitBlockDeclRefExpr(BlockDeclRefExpr *E) {
8842 S.MarkDeclarationReferenced(E->getLocation(), E->getDecl());
8843 }
Douglas Gregor102ff972010-10-19 17:17:35 +00008844
8845 void VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
8846 Visit(E->getExpr());
8847 }
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00008848 };
8849}
8850
8851/// \brief Mark any declarations that appear within this expression or any
8852/// potentially-evaluated subexpressions as "referenced".
8853void Sema::MarkDeclarationsReferencedInExpr(Expr *E) {
8854 EvaluatedExprMarker(*this).Visit(E);
8855}
8856
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00008857/// \brief Emit a diagnostic that describes an effect on the run-time behavior
8858/// of the program being compiled.
8859///
8860/// This routine emits the given diagnostic when the code currently being
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008861/// type-checked is "potentially evaluated", meaning that there is a
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00008862/// possibility that the code will actually be executable. Code in sizeof()
8863/// expressions, code used only during overload resolution, etc., are not
8864/// potentially evaluated. This routine will suppress such diagnostics or,
8865/// in the absolutely nutty case of potentially potentially evaluated
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008866/// expressions (C++ typeid), queue the diagnostic to potentially emit it
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00008867/// later.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008868///
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00008869/// This routine should be used for all diagnostics that describe the run-time
8870/// behavior of a program, such as passing a non-POD value through an ellipsis.
8871/// Failure to do so will likely result in spurious diagnostics or failures
8872/// during overload resolution or within sizeof/alignof/typeof/typeid.
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008873bool Sema::DiagRuntimeBehavior(SourceLocation Loc,
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00008874 const PartialDiagnostic &PD) {
8875 switch (ExprEvalContexts.back().Context ) {
8876 case Unevaluated:
8877 // The argument will never be evaluated, so don't complain.
8878 break;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008879
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00008880 case PotentiallyEvaluated:
Douglas Gregorbe0f7bd2010-09-11 20:24:53 +00008881 case PotentiallyEvaluatedIfUsed:
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00008882 Diag(Loc, PD);
8883 return true;
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008884
Douglas Gregor1c7c3fb2009-12-22 01:01:55 +00008885 case PotentiallyPotentiallyEvaluated:
8886 ExprEvalContexts.back().addDiagnostic(Loc, PD);
8887 break;
8888 }
8889
8890 return false;
8891}
8892
Anders Carlsson8c8d9192009-10-09 23:51:55 +00008893bool Sema::CheckCallReturnType(QualType ReturnType, SourceLocation Loc,
8894 CallExpr *CE, FunctionDecl *FD) {
8895 if (ReturnType->isVoidType() || !ReturnType->isIncompleteType())
8896 return false;
8897
8898 PartialDiagnostic Note =
8899 FD ? PDiag(diag::note_function_with_incomplete_return_type_declared_here)
8900 << FD->getDeclName() : PDiag();
8901 SourceLocation NoteLoc = FD ? FD->getLocation() : SourceLocation();
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008902
Anders Carlsson8c8d9192009-10-09 23:51:55 +00008903 if (RequireCompleteType(Loc, ReturnType,
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008904 FD ?
Anders Carlsson8c8d9192009-10-09 23:51:55 +00008905 PDiag(diag::err_call_function_incomplete_return)
8906 << CE->getSourceRange() << FD->getDeclName() :
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008907 PDiag(diag::err_call_incomplete_return)
Anders Carlsson8c8d9192009-10-09 23:51:55 +00008908 << CE->getSourceRange(),
8909 std::make_pair(NoteLoc, Note)))
8910 return true;
8911
8912 return false;
8913}
8914
John McCall5a881bb2009-10-12 21:59:07 +00008915// Diagnose the common s/=/==/ typo. Note that adding parentheses
8916// will prevent this condition from triggering, which is what we want.
8917void Sema::DiagnoseAssignmentAsCondition(Expr *E) {
8918 SourceLocation Loc;
8919
John McCalla52ef082009-11-11 02:41:58 +00008920 unsigned diagnostic = diag::warn_condition_is_assignment;
8921
John McCall5a881bb2009-10-12 21:59:07 +00008922 if (isa<BinaryOperator>(E)) {
8923 BinaryOperator *Op = cast<BinaryOperator>(E);
John McCall2de56d12010-08-25 11:45:40 +00008924 if (Op->getOpcode() != BO_Assign)
John McCall5a881bb2009-10-12 21:59:07 +00008925 return;
8926
John McCallc8d8ac52009-11-12 00:06:05 +00008927 // Greylist some idioms by putting them into a warning subcategory.
8928 if (ObjCMessageExpr *ME
8929 = dyn_cast<ObjCMessageExpr>(Op->getRHS()->IgnoreParenCasts())) {
8930 Selector Sel = ME->getSelector();
8931
John McCallc8d8ac52009-11-12 00:06:05 +00008932 // self = [<foo> init...]
8933 if (isSelfExpr(Op->getLHS())
8934 && Sel.getIdentifierInfoForSlot(0)->getName().startswith("init"))
8935 diagnostic = diag::warn_condition_is_idiomatic_assignment;
8936
8937 // <foo> = [<bar> nextObject]
8938 else if (Sel.isUnarySelector() &&
8939 Sel.getIdentifierInfoForSlot(0)->getName() == "nextObject")
8940 diagnostic = diag::warn_condition_is_idiomatic_assignment;
8941 }
John McCalla52ef082009-11-11 02:41:58 +00008942
John McCall5a881bb2009-10-12 21:59:07 +00008943 Loc = Op->getOperatorLoc();
8944 } else if (isa<CXXOperatorCallExpr>(E)) {
8945 CXXOperatorCallExpr *Op = cast<CXXOperatorCallExpr>(E);
8946 if (Op->getOperator() != OO_Equal)
8947 return;
8948
8949 Loc = Op->getOperatorLoc();
8950 } else {
8951 // Not an assignment.
8952 return;
8953 }
8954
John McCall5a881bb2009-10-12 21:59:07 +00008955 SourceLocation Open = E->getSourceRange().getBegin();
John McCall2d152152009-10-12 22:25:59 +00008956 SourceLocation Close = PP.getLocForEndOfToken(E->getSourceRange().getEnd());
Kovarththanan Rajaratnam19357542010-03-13 10:17:05 +00008957
Douglas Gregor55b38842010-04-14 16:09:52 +00008958 Diag(Loc, diagnostic) << E->getSourceRange();
Douglas Gregor827feec2010-01-08 00:20:23 +00008959 Diag(Loc, diag::note_condition_assign_to_comparison)
Douglas Gregor849b2432010-03-31 17:46:05 +00008960 << FixItHint::CreateReplacement(Loc, "==");
Douglas Gregor55b38842010-04-14 16:09:52 +00008961 Diag(Loc, diag::note_condition_assign_silence)
8962 << FixItHint::CreateInsertion(Open, "(")
8963 << FixItHint::CreateInsertion(Close, ")");
John McCall5a881bb2009-10-12 21:59:07 +00008964}
8965
8966bool Sema::CheckBooleanCondition(Expr *&E, SourceLocation Loc) {
8967 DiagnoseAssignmentAsCondition(E);
8968
8969 if (!E->isTypeDependent()) {
Argyrios Kyrtzidis11ab7902010-11-01 18:49:26 +00008970 if (E->isBoundMemberFunction(Context))
8971 return Diag(E->getLocStart(), diag::err_invalid_use_of_bound_member_func)
8972 << E->getSourceRange();
8973
Douglas Gregora873dfc2010-02-03 00:27:59 +00008974 DefaultFunctionArrayLvalueConversion(E);
John McCall5a881bb2009-10-12 21:59:07 +00008975
8976 QualType T = E->getType();
8977
8978 if (getLangOptions().CPlusPlus) {
8979 if (CheckCXXBooleanCondition(E)) // C++ 6.4p4
8980 return true;
8981 } else if (!T->isScalarType()) { // C99 6.8.4.1p1
8982 Diag(Loc, diag::err_typecheck_statement_requires_scalar)
8983 << T << E->getSourceRange();
8984 return true;
8985 }
8986 }
8987
8988 return false;
8989}
Douglas Gregor586596f2010-05-06 17:25:47 +00008990
John McCall60d7b3a2010-08-24 06:29:42 +00008991ExprResult Sema::ActOnBooleanCondition(Scope *S, SourceLocation Loc,
8992 Expr *Sub) {
Douglas Gregoreecf38f2010-05-06 21:39:56 +00008993 if (!Sub)
Douglas Gregor586596f2010-05-06 17:25:47 +00008994 return ExprError();
8995
Douglas Gregorff331c12010-07-25 18:17:45 +00008996 if (CheckBooleanCondition(Sub, Loc))
Douglas Gregor586596f2010-05-06 17:25:47 +00008997 return ExprError();
Douglas Gregor586596f2010-05-06 17:25:47 +00008998
8999 return Owned(Sub);
9000}
John McCall2a984ca2010-10-12 00:20:44 +00009001
9002/// Check for operands with placeholder types and complain if found.
9003/// Returns true if there was an error and no recovery was possible.
9004ExprResult Sema::CheckPlaceholderExpr(Expr *E, SourceLocation Loc) {
9005 const BuiltinType *BT = E->getType()->getAs<BuiltinType>();
9006 if (!BT || !BT->isPlaceholderType()) return Owned(E);
9007
9008 // If this is overload, check for a single overload.
9009 if (BT->getKind() == BuiltinType::Overload) {
9010 if (FunctionDecl *Specialization
9011 = ResolveSingleFunctionTemplateSpecialization(E)) {
9012 // The access doesn't really matter in this case.
9013 DeclAccessPair Found = DeclAccessPair::make(Specialization,
9014 Specialization->getAccess());
9015 E = FixOverloadedFunctionReference(E, Found, Specialization);
9016 if (!E) return ExprError();
9017 return Owned(E);
9018 }
9019
John McCall2cd11fe2010-10-12 02:09:17 +00009020 Diag(Loc, diag::err_ovl_unresolvable) << E->getSourceRange();
John McCall2a984ca2010-10-12 00:20:44 +00009021 return ExprError();
9022 }
9023
9024 // Otherwise it's a use of undeduced auto.
9025 assert(BT->getKind() == BuiltinType::UndeducedAuto);
9026
9027 DeclRefExpr *DRE = cast<DeclRefExpr>(E->IgnoreParens());
9028 Diag(Loc, diag::err_auto_variable_cannot_appear_in_own_initializer)
9029 << DRE->getDecl() << E->getSourceRange();
9030 return ExprError();
9031}