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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- SemaExprCXX.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 C++ expressions.
11//
12//===----------------------------------------------------------------------===//
13
14#include "Sema.h"
John McCall7d384dd2009-11-18 07:57:50 +000015#include "Lookup.h"
Steve Naroff210679c2007-08-25 14:02:58 +000016#include "clang/AST/ASTContext.h"
Douglas Gregora8f32e02009-10-06 17:59:45 +000017#include "clang/AST/CXXInheritance.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000018#include "clang/AST/ExprCXX.h"
19#include "clang/Basic/PartialDiagnostic.h"
Sebastian Redlb5a57a62008-12-03 20:26:15 +000020#include "clang/Basic/TargetInfo.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000021#include "clang/Lex/Preprocessor.h"
22#include "clang/Parse/DeclSpec.h"
Douglas Gregor3fc749d2008-12-23 00:26:44 +000023#include "llvm/ADT/STLExtras.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000024using namespace clang;
25
Sebastian Redlc42e1182008-11-11 11:37:55 +000026/// ActOnCXXTypeidOfType - Parse typeid( type-id ).
Sebastian Redlf53597f2009-03-15 17:47:39 +000027Action::OwningExprResult
Sebastian Redlc42e1182008-11-11 11:37:55 +000028Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
29 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
Douglas Gregor7adb10f2009-09-15 22:30:29 +000030 if (!StdNamespace)
Sebastian Redlf53597f2009-03-15 17:47:39 +000031 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
Argyrios Kyrtzidise8661902009-08-19 01:28:28 +000032
33 if (isType)
34 // FIXME: Preserve type source info.
35 TyOrExpr = GetTypeFromParser(TyOrExpr).getAsOpaquePtr();
36
Chris Lattner572af492008-11-20 05:51:55 +000037 IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
John McCalla24dc2e2009-11-17 02:14:36 +000038 LookupResult R(*this, TypeInfoII, SourceLocation(), LookupTagName);
39 LookupQualifiedName(R, StdNamespace);
John McCall1bcee0a2009-12-02 08:25:40 +000040 RecordDecl *TypeInfoRecordDecl = R.getAsSingle<RecordDecl>();
Chris Lattner572af492008-11-20 05:51:55 +000041 if (!TypeInfoRecordDecl)
Sebastian Redlf53597f2009-03-15 17:47:39 +000042 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
Sebastian Redlc42e1182008-11-11 11:37:55 +000043
44 QualType TypeInfoType = Context.getTypeDeclType(TypeInfoRecordDecl);
45
Douglas Gregorac7610d2009-06-22 20:57:11 +000046 if (!isType) {
47 // C++0x [expr.typeid]p3:
Mike Stump1eb44332009-09-09 15:08:12 +000048 // When typeid is applied to an expression other than an lvalue of a
49 // polymorphic class type [...] [the] expression is an unevaluated
Douglas Gregorac7610d2009-06-22 20:57:11 +000050 // operand.
Mike Stump1eb44332009-09-09 15:08:12 +000051
Douglas Gregorac7610d2009-06-22 20:57:11 +000052 // FIXME: if the type of the expression is a class type, the class
53 // shall be completely defined.
54 bool isUnevaluatedOperand = true;
55 Expr *E = static_cast<Expr *>(TyOrExpr);
56 if (E && !E->isTypeDependent() && E->isLvalue(Context) == Expr::LV_Valid) {
57 QualType T = E->getType();
Ted Kremenek6217b802009-07-29 21:53:49 +000058 if (const RecordType *RecordT = T->getAs<RecordType>()) {
Douglas Gregorac7610d2009-06-22 20:57:11 +000059 CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl());
60 if (RecordD->isPolymorphic())
61 isUnevaluatedOperand = false;
62 }
63 }
Mike Stump1eb44332009-09-09 15:08:12 +000064
Douglas Gregor2afce722009-11-26 00:44:06 +000065 // If this is an unevaluated operand, clear out the set of
66 // declaration references we have been computing and eliminate any
67 // temporaries introduced in its computation.
Douglas Gregorac7610d2009-06-22 20:57:11 +000068 if (isUnevaluatedOperand)
Douglas Gregor2afce722009-11-26 00:44:06 +000069 ExprEvalContexts.back().Context = Unevaluated;
Douglas Gregorac7610d2009-06-22 20:57:11 +000070 }
Mike Stump1eb44332009-09-09 15:08:12 +000071
Sebastian Redlf53597f2009-03-15 17:47:39 +000072 return Owned(new (Context) CXXTypeidExpr(isType, TyOrExpr,
73 TypeInfoType.withConst(),
74 SourceRange(OpLoc, RParenLoc)));
Sebastian Redlc42e1182008-11-11 11:37:55 +000075}
76
Steve Naroff1b273c42007-09-16 14:56:35 +000077/// ActOnCXXBoolLiteral - Parse {true,false} literals.
Sebastian Redlf53597f2009-03-15 17:47:39 +000078Action::OwningExprResult
Steve Naroff1b273c42007-09-16 14:56:35 +000079Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
Douglas Gregor2f639b92008-10-24 15:36:09 +000080 assert((Kind == tok::kw_true || Kind == tok::kw_false) &&
Reid Spencer5f016e22007-07-11 17:01:13 +000081 "Unknown C++ Boolean value!");
Sebastian Redlf53597f2009-03-15 17:47:39 +000082 return Owned(new (Context) CXXBoolLiteralExpr(Kind == tok::kw_true,
83 Context.BoolTy, OpLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +000084}
Chris Lattner50dd2892008-02-26 00:51:44 +000085
Sebastian Redl6e8ed162009-05-10 18:38:11 +000086/// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
87Action::OwningExprResult
88Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
89 return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc));
90}
91
Chris Lattner50dd2892008-02-26 00:51:44 +000092/// ActOnCXXThrow - Parse throw expressions.
Sebastian Redlf53597f2009-03-15 17:47:39 +000093Action::OwningExprResult
94Sema::ActOnCXXThrow(SourceLocation OpLoc, ExprArg E) {
Sebastian Redl972041f2009-04-27 20:27:31 +000095 Expr *Ex = E.takeAs<Expr>();
96 if (Ex && !Ex->isTypeDependent() && CheckCXXThrowOperand(OpLoc, Ex))
97 return ExprError();
98 return Owned(new (Context) CXXThrowExpr(Ex, Context.VoidTy, OpLoc));
99}
100
101/// CheckCXXThrowOperand - Validate the operand of a throw.
102bool Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *&E) {
103 // C++ [except.throw]p3:
104 // [...] adjusting the type from "array of T" or "function returning T"
105 // to "pointer to T" or "pointer to function returning T", [...]
106 DefaultFunctionArrayConversion(E);
107
108 // If the type of the exception would be an incomplete type or a pointer
109 // to an incomplete type other than (cv) void the program is ill-formed.
110 QualType Ty = E->getType();
111 int isPointer = 0;
Ted Kremenek6217b802009-07-29 21:53:49 +0000112 if (const PointerType* Ptr = Ty->getAs<PointerType>()) {
Sebastian Redl972041f2009-04-27 20:27:31 +0000113 Ty = Ptr->getPointeeType();
114 isPointer = 1;
115 }
116 if (!isPointer || !Ty->isVoidType()) {
117 if (RequireCompleteType(ThrowLoc, Ty,
Anders Carlssond497ba72009-08-26 22:59:12 +0000118 PDiag(isPointer ? diag::err_throw_incomplete_ptr
119 : diag::err_throw_incomplete)
120 << E->getSourceRange()))
Sebastian Redl972041f2009-04-27 20:27:31 +0000121 return true;
122 }
123
124 // FIXME: Construct a temporary here.
125 return false;
Chris Lattner50dd2892008-02-26 00:51:44 +0000126}
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000127
Sebastian Redlf53597f2009-03-15 17:47:39 +0000128Action::OwningExprResult Sema::ActOnCXXThis(SourceLocation ThisLoc) {
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000129 /// C++ 9.3.2: In the body of a non-static member function, the keyword this
130 /// is a non-lvalue expression whose value is the address of the object for
131 /// which the function is called.
132
Sebastian Redlf53597f2009-03-15 17:47:39 +0000133 if (!isa<FunctionDecl>(CurContext))
134 return ExprError(Diag(ThisLoc, diag::err_invalid_this_use));
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000135
136 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext))
137 if (MD->isInstance())
Sebastian Redlf53597f2009-03-15 17:47:39 +0000138 return Owned(new (Context) CXXThisExpr(ThisLoc,
139 MD->getThisType(Context)));
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000140
Sebastian Redlf53597f2009-03-15 17:47:39 +0000141 return ExprError(Diag(ThisLoc, diag::err_invalid_this_use));
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000142}
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000143
144/// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
145/// Can be interpreted either as function-style casting ("int(x)")
146/// or class type construction ("ClassType(x,y,z)")
147/// or creation of a value-initialized type ("int()").
Sebastian Redlf53597f2009-03-15 17:47:39 +0000148Action::OwningExprResult
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000149Sema::ActOnCXXTypeConstructExpr(SourceRange TypeRange, TypeTy *TypeRep,
150 SourceLocation LParenLoc,
Sebastian Redlf53597f2009-03-15 17:47:39 +0000151 MultiExprArg exprs,
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000152 SourceLocation *CommaLocs,
153 SourceLocation RParenLoc) {
154 assert(TypeRep && "Missing type!");
Argyrios Kyrtzidise8661902009-08-19 01:28:28 +0000155 // FIXME: Preserve type source info.
156 QualType Ty = GetTypeFromParser(TypeRep);
Sebastian Redlf53597f2009-03-15 17:47:39 +0000157 unsigned NumExprs = exprs.size();
158 Expr **Exprs = (Expr**)exprs.get();
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000159 SourceLocation TyBeginLoc = TypeRange.getBegin();
160 SourceRange FullRange = SourceRange(TyBeginLoc, RParenLoc);
161
Sebastian Redlf53597f2009-03-15 17:47:39 +0000162 if (Ty->isDependentType() ||
Douglas Gregorba498172009-03-13 21:01:28 +0000163 CallExpr::hasAnyTypeDependentArguments(Exprs, NumExprs)) {
Sebastian Redlf53597f2009-03-15 17:47:39 +0000164 exprs.release();
Mike Stump1eb44332009-09-09 15:08:12 +0000165
166 return Owned(CXXUnresolvedConstructExpr::Create(Context,
167 TypeRange.getBegin(), Ty,
Douglas Gregord81e6ca2009-05-20 18:46:25 +0000168 LParenLoc,
169 Exprs, NumExprs,
170 RParenLoc));
Douglas Gregorba498172009-03-13 21:01:28 +0000171 }
172
Anders Carlssonbb60a502009-08-27 03:53:50 +0000173 if (Ty->isArrayType())
174 return ExprError(Diag(TyBeginLoc,
175 diag::err_value_init_for_array_type) << FullRange);
176 if (!Ty->isVoidType() &&
177 RequireCompleteType(TyBeginLoc, Ty,
178 PDiag(diag::err_invalid_incomplete_type_use)
179 << FullRange))
180 return ExprError();
Fariborz Jahanianf071e9b2009-10-23 21:01:39 +0000181
Anders Carlssonbb60a502009-08-27 03:53:50 +0000182 if (RequireNonAbstractType(TyBeginLoc, Ty,
183 diag::err_allocation_of_abstract_type))
184 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +0000185
186
Douglas Gregor506ae412009-01-16 18:33:17 +0000187 // C++ [expr.type.conv]p1:
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000188 // If the expression list is a single expression, the type conversion
189 // expression is equivalent (in definedness, and if defined in meaning) to the
190 // corresponding cast expression.
191 //
192 if (NumExprs == 1) {
Anders Carlssoncdb61972009-08-07 22:21:05 +0000193 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
Anders Carlsson0aebc812009-09-09 21:33:21 +0000194 CXXMethodDecl *Method = 0;
195 if (CheckCastTypes(TypeRange, Ty, Exprs[0], Kind, Method,
196 /*FunctionalStyle=*/true))
Sebastian Redlf53597f2009-03-15 17:47:39 +0000197 return ExprError();
Anders Carlsson0aebc812009-09-09 21:33:21 +0000198
199 exprs.release();
200 if (Method) {
201 OwningExprResult CastArg
202 = BuildCXXCastArgument(TypeRange.getBegin(), Ty.getNonReferenceType(),
203 Kind, Method, Owned(Exprs[0]));
204 if (CastArg.isInvalid())
205 return ExprError();
206
207 Exprs[0] = CastArg.takeAs<Expr>();
Fariborz Jahanian4fc7ab32009-08-28 15:11:24 +0000208 }
Anders Carlsson0aebc812009-09-09 21:33:21 +0000209
210 return Owned(new (Context) CXXFunctionalCastExpr(Ty.getNonReferenceType(),
211 Ty, TyBeginLoc, Kind,
212 Exprs[0], RParenLoc));
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000213 }
214
Ted Kremenek6217b802009-07-29 21:53:49 +0000215 if (const RecordType *RT = Ty->getAs<RecordType>()) {
Douglas Gregor506ae412009-01-16 18:33:17 +0000216 CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl());
Sebastian Redlf53597f2009-03-15 17:47:39 +0000217
Mike Stump1eb44332009-09-09 15:08:12 +0000218 if (NumExprs > 1 || !Record->hasTrivialConstructor() ||
Anders Carlssone7624a72009-08-27 05:08:22 +0000219 !Record->hasTrivialDestructor()) {
Douglas Gregor39da0b82009-09-09 23:08:42 +0000220 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
221
Douglas Gregor506ae412009-01-16 18:33:17 +0000222 CXXConstructorDecl *Constructor
Douglas Gregor39da0b82009-09-09 23:08:42 +0000223 = PerformInitializationByConstructor(Ty, move(exprs),
Douglas Gregor506ae412009-01-16 18:33:17 +0000224 TypeRange.getBegin(),
225 SourceRange(TypeRange.getBegin(),
226 RParenLoc),
227 DeclarationName(),
Douglas Gregor39da0b82009-09-09 23:08:42 +0000228 IK_Direct,
229 ConstructorArgs);
Douglas Gregor506ae412009-01-16 18:33:17 +0000230
Sebastian Redlf53597f2009-03-15 17:47:39 +0000231 if (!Constructor)
232 return ExprError();
233
Mike Stump1eb44332009-09-09 15:08:12 +0000234 OwningExprResult Result =
235 BuildCXXTemporaryObjectExpr(Constructor, Ty, TyBeginLoc,
Douglas Gregor39da0b82009-09-09 23:08:42 +0000236 move_arg(ConstructorArgs), RParenLoc);
Anders Carlssone7624a72009-08-27 05:08:22 +0000237 if (Result.isInvalid())
238 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +0000239
Anders Carlssone7624a72009-08-27 05:08:22 +0000240 return MaybeBindToTemporary(Result.takeAs<Expr>());
Douglas Gregor506ae412009-01-16 18:33:17 +0000241 }
242
243 // Fall through to value-initialize an object of class type that
244 // doesn't have a user-declared default constructor.
245 }
246
247 // C++ [expr.type.conv]p1:
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000248 // If the expression list specifies more than a single value, the type shall
249 // be a class with a suitably declared constructor.
250 //
251 if (NumExprs > 1)
Sebastian Redlf53597f2009-03-15 17:47:39 +0000252 return ExprError(Diag(CommaLocs[0],
253 diag::err_builtin_func_cast_more_than_one_arg)
254 << FullRange);
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000255
256 assert(NumExprs == 0 && "Expected 0 expressions");
Douglas Gregor506ae412009-01-16 18:33:17 +0000257 // C++ [expr.type.conv]p2:
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000258 // The expression T(), where T is a simple-type-specifier for a non-array
259 // complete object type or the (possibly cv-qualified) void type, creates an
260 // rvalue of the specified type, which is value-initialized.
261 //
Sebastian Redlf53597f2009-03-15 17:47:39 +0000262 exprs.release();
263 return Owned(new (Context) CXXZeroInitValueExpr(Ty, TyBeginLoc, RParenLoc));
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000264}
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000265
266
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000267/// ActOnCXXNew - Parsed a C++ 'new' expression (C++ 5.3.4), as in e.g.:
268/// @code new (memory) int[size][4] @endcode
269/// or
270/// @code ::new Foo(23, "hello") @endcode
271/// For the interpretation of this heap of arguments, consult the base version.
Sebastian Redlf53597f2009-03-15 17:47:39 +0000272Action::OwningExprResult
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000273Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
Sebastian Redlf53597f2009-03-15 17:47:39 +0000274 SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000275 SourceLocation PlacementRParen, bool ParenTypeId,
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000276 Declarator &D, SourceLocation ConstructorLParen,
Sebastian Redlf53597f2009-03-15 17:47:39 +0000277 MultiExprArg ConstructorArgs,
Mike Stump1eb44332009-09-09 15:08:12 +0000278 SourceLocation ConstructorRParen) {
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000279 Expr *ArraySize = 0;
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000280 // If the specified type is an array, unwrap it and save the expression.
281 if (D.getNumTypeObjects() > 0 &&
282 D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
283 DeclaratorChunk &Chunk = D.getTypeObject(0);
284 if (Chunk.Arr.hasStatic)
Sebastian Redlf53597f2009-03-15 17:47:39 +0000285 return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new)
286 << D.getSourceRange());
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000287 if (!Chunk.Arr.NumElts)
Sebastian Redlf53597f2009-03-15 17:47:39 +0000288 return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size)
289 << D.getSourceRange());
Sebastian Redl8ce35b02009-10-25 21:45:37 +0000290
291 if (ParenTypeId) {
292 // Can't have dynamic array size when the type-id is in parentheses.
293 Expr *NumElts = (Expr *)Chunk.Arr.NumElts;
294 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() &&
295 !NumElts->isIntegerConstantExpr(Context)) {
296 Diag(D.getTypeObject(0).Loc, diag::err_new_paren_array_nonconst)
297 << NumElts->getSourceRange();
298 return ExprError();
299 }
300 }
301
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000302 ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts);
Sebastian Redl8ce35b02009-10-25 21:45:37 +0000303 D.DropFirstTypeObject();
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000304 }
305
Douglas Gregor043cad22009-09-11 00:18:58 +0000306 // Every dimension shall be of constant size.
Sebastian Redl8ce35b02009-10-25 21:45:37 +0000307 if (ArraySize) {
308 for (unsigned I = 0, N = D.getNumTypeObjects(); I < N; ++I) {
Douglas Gregor043cad22009-09-11 00:18:58 +0000309 if (D.getTypeObject(I).Kind != DeclaratorChunk::Array)
310 break;
311
312 DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr;
313 if (Expr *NumElts = (Expr *)Array.NumElts) {
314 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() &&
315 !NumElts->isIntegerConstantExpr(Context)) {
316 Diag(D.getTypeObject(I).Loc, diag::err_new_array_nonconst)
317 << NumElts->getSourceRange();
318 return ExprError();
319 }
320 }
321 }
322 }
Sebastian Redl8ce35b02009-10-25 21:45:37 +0000323
John McCalla93c9342009-12-07 02:54:59 +0000324 //FIXME: Store TypeSourceInfo in CXXNew expression.
325 TypeSourceInfo *TInfo = 0;
326 QualType AllocType = GetTypeForDeclarator(D, /*Scope=*/0, &TInfo);
Chris Lattnereaaebc72009-04-25 08:06:05 +0000327 if (D.isInvalidType())
Sebastian Redlf53597f2009-03-15 17:47:39 +0000328 return ExprError();
Fariborz Jahanian498429f2009-11-19 18:39:40 +0000329
Mike Stump1eb44332009-09-09 15:08:12 +0000330 return BuildCXXNew(StartLoc, UseGlobal,
Douglas Gregor3433cf72009-05-21 00:00:09 +0000331 PlacementLParen,
Mike Stump1eb44332009-09-09 15:08:12 +0000332 move(PlacementArgs),
Douglas Gregor3433cf72009-05-21 00:00:09 +0000333 PlacementRParen,
334 ParenTypeId,
Mike Stump1eb44332009-09-09 15:08:12 +0000335 AllocType,
Douglas Gregor3433cf72009-05-21 00:00:09 +0000336 D.getSourceRange().getBegin(),
337 D.getSourceRange(),
338 Owned(ArraySize),
339 ConstructorLParen,
340 move(ConstructorArgs),
341 ConstructorRParen);
342}
343
Mike Stump1eb44332009-09-09 15:08:12 +0000344Sema::OwningExprResult
Douglas Gregor3433cf72009-05-21 00:00:09 +0000345Sema::BuildCXXNew(SourceLocation StartLoc, bool UseGlobal,
346 SourceLocation PlacementLParen,
347 MultiExprArg PlacementArgs,
348 SourceLocation PlacementRParen,
Mike Stump1eb44332009-09-09 15:08:12 +0000349 bool ParenTypeId,
Douglas Gregor3433cf72009-05-21 00:00:09 +0000350 QualType AllocType,
351 SourceLocation TypeLoc,
352 SourceRange TypeRange,
353 ExprArg ArraySizeE,
354 SourceLocation ConstructorLParen,
355 MultiExprArg ConstructorArgs,
356 SourceLocation ConstructorRParen) {
357 if (CheckAllocatedType(AllocType, TypeLoc, TypeRange))
Sebastian Redlf53597f2009-03-15 17:47:39 +0000358 return ExprError();
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000359
Douglas Gregor3433cf72009-05-21 00:00:09 +0000360 QualType ResultType = Context.getPointerType(AllocType);
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000361
362 // That every array dimension except the first is constant was already
363 // checked by the type check above.
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000364
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000365 // C++ 5.3.4p6: "The expression in a direct-new-declarator shall have integral
366 // or enumeration type with a non-negative value."
Douglas Gregor3433cf72009-05-21 00:00:09 +0000367 Expr *ArraySize = (Expr *)ArraySizeE.get();
Sebastian Redl28507842009-02-26 14:39:58 +0000368 if (ArraySize && !ArraySize->isTypeDependent()) {
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000369 QualType SizeType = ArraySize->getType();
370 if (!SizeType->isIntegralType() && !SizeType->isEnumeralType())
Sebastian Redlf53597f2009-03-15 17:47:39 +0000371 return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
372 diag::err_array_size_not_integral)
373 << SizeType << ArraySize->getSourceRange());
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000374 // Let's see if this is a constant < 0. If so, we reject it out of hand.
375 // We don't care about special rules, so we tell the machinery it's not
376 // evaluated - it gives us a result in more cases.
Sebastian Redl28507842009-02-26 14:39:58 +0000377 if (!ArraySize->isValueDependent()) {
378 llvm::APSInt Value;
379 if (ArraySize->isIntegerConstantExpr(Value, Context, 0, false)) {
380 if (Value < llvm::APSInt(
Anders Carlssonac18b2e2009-09-23 00:37:25 +0000381 llvm::APInt::getNullValue(Value.getBitWidth()),
382 Value.isUnsigned()))
Sebastian Redlf53597f2009-03-15 17:47:39 +0000383 return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
384 diag::err_typecheck_negative_array_size)
385 << ArraySize->getSourceRange());
Sebastian Redl28507842009-02-26 14:39:58 +0000386 }
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000387 }
Anders Carlssonac18b2e2009-09-23 00:37:25 +0000388
Eli Friedman73c39ab2009-10-20 08:27:19 +0000389 ImpCastExprToType(ArraySize, Context.getSizeType(),
390 CastExpr::CK_IntegralCast);
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000391 }
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000392
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000393 FunctionDecl *OperatorNew = 0;
394 FunctionDecl *OperatorDelete = 0;
Sebastian Redlf53597f2009-03-15 17:47:39 +0000395 Expr **PlaceArgs = (Expr**)PlacementArgs.get();
396 unsigned NumPlaceArgs = PlacementArgs.size();
Fariborz Jahanian498429f2009-11-19 18:39:40 +0000397
Sebastian Redl28507842009-02-26 14:39:58 +0000398 if (!AllocType->isDependentType() &&
399 !Expr::hasAnyTypeDependentArguments(PlaceArgs, NumPlaceArgs) &&
400 FindAllocationFunctions(StartLoc,
Sebastian Redl00e68e22009-02-09 18:24:27 +0000401 SourceRange(PlacementLParen, PlacementRParen),
402 UseGlobal, AllocType, ArraySize, PlaceArgs,
403 NumPlaceArgs, OperatorNew, OperatorDelete))
Sebastian Redlf53597f2009-03-15 17:47:39 +0000404 return ExprError();
Fariborz Jahanian048f52a2009-11-24 18:29:37 +0000405 llvm::SmallVector<Expr *, 8> AllPlaceArgs;
Fariborz Jahanian498429f2009-11-19 18:39:40 +0000406 if (OperatorNew) {
407 // Add default arguments, if any.
408 const FunctionProtoType *Proto =
409 OperatorNew->getType()->getAs<FunctionProtoType>();
Fariborz Jahanian4cd1c702009-11-24 19:27:49 +0000410 VariadicCallType CallType =
411 Proto->isVariadic() ? VariadicFunction : VariadicDoesNotApply;
Fariborz Jahanian048f52a2009-11-24 18:29:37 +0000412 bool Invalid = GatherArgumentsForCall(PlacementLParen, OperatorNew,
413 Proto, 1, PlaceArgs, NumPlaceArgs,
Fariborz Jahanian2fe168f2009-11-24 21:37:28 +0000414 AllPlaceArgs, CallType);
Fariborz Jahanian048f52a2009-11-24 18:29:37 +0000415 if (Invalid)
416 return ExprError();
Fariborz Jahanian498429f2009-11-19 18:39:40 +0000417
Fariborz Jahanian498429f2009-11-19 18:39:40 +0000418 NumPlaceArgs = AllPlaceArgs.size();
419 if (NumPlaceArgs > 0)
420 PlaceArgs = &AllPlaceArgs[0];
421 }
422
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000423 bool Init = ConstructorLParen.isValid();
424 // --- Choosing a constructor ---
425 // C++ 5.3.4p15
426 // 1) If T is a POD and there's no initializer (ConstructorLParen is invalid)
427 // the object is not initialized. If the object, or any part of it, is
428 // const-qualified, it's an error.
429 // 2) If T is a POD and there's an empty initializer, the object is value-
430 // initialized.
431 // 3) If T is a POD and there's one initializer argument, the object is copy-
432 // constructed.
433 // 4) If T is a POD and there's more initializer arguments, it's an error.
434 // 5) If T is not a POD, the initializer arguments are used as constructor
435 // arguments.
436 //
437 // Or by the C++0x formulation:
438 // 1) If there's no initializer, the object is default-initialized according
439 // to C++0x rules.
440 // 2) Otherwise, the object is direct-initialized.
441 CXXConstructorDecl *Constructor = 0;
Sebastian Redlf53597f2009-03-15 17:47:39 +0000442 Expr **ConsArgs = (Expr**)ConstructorArgs.get();
Sebastian Redl4f149632009-05-07 16:14:23 +0000443 const RecordType *RT;
Sebastian Redlf53597f2009-03-15 17:47:39 +0000444 unsigned NumConsArgs = ConstructorArgs.size();
Eli Friedmana8ce9ec2009-11-08 22:15:39 +0000445 ASTOwningVector<&ActionBase::DeleteExpr> ConvertedConstructorArgs(*this);
446
Douglas Gregor089407b2009-10-17 21:40:42 +0000447 if (AllocType->isDependentType() ||
448 Expr::hasAnyTypeDependentArguments(ConsArgs, NumConsArgs)) {
Sebastian Redl28507842009-02-26 14:39:58 +0000449 // Skip all the checks.
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000450 } else if ((RT = AllocType->getAs<RecordType>()) &&
451 !AllocType->isAggregateType()) {
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000452 Constructor = PerformInitializationByConstructor(
Douglas Gregor39da0b82009-09-09 23:08:42 +0000453 AllocType, move(ConstructorArgs),
Douglas Gregor3433cf72009-05-21 00:00:09 +0000454 TypeLoc,
455 SourceRange(TypeLoc, ConstructorRParen),
Chris Lattnerd9d22dd2008-11-24 05:29:24 +0000456 RT->getDecl()->getDeclName(),
Douglas Gregor39da0b82009-09-09 23:08:42 +0000457 NumConsArgs != 0 ? IK_Direct : IK_Default,
458 ConvertedConstructorArgs);
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000459 if (!Constructor)
Sebastian Redlf53597f2009-03-15 17:47:39 +0000460 return ExprError();
Douglas Gregor39da0b82009-09-09 23:08:42 +0000461
462 // Take the converted constructor arguments and use them for the new
463 // expression.
464 NumConsArgs = ConvertedConstructorArgs.size();
465 ConsArgs = (Expr **)ConvertedConstructorArgs.take();
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000466 } else {
467 if (!Init) {
468 // FIXME: Check that no subpart is const.
Sebastian Redlf53597f2009-03-15 17:47:39 +0000469 if (AllocType.isConstQualified())
470 return ExprError(Diag(StartLoc, diag::err_new_uninitialized_const)
Douglas Gregor3433cf72009-05-21 00:00:09 +0000471 << TypeRange);
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000472 } else if (NumConsArgs == 0) {
Fariborz Jahanian6f269202009-11-03 20:38:53 +0000473 // Object is value-initialized. Do nothing.
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000474 } else if (NumConsArgs == 1) {
475 // Object is direct-initialized.
Sebastian Redl4f149632009-05-07 16:14:23 +0000476 // FIXME: What DeclarationName do we pass in here?
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000477 if (CheckInitializerTypes(ConsArgs[0], AllocType, StartLoc,
Douglas Gregor09f41cf2009-01-14 15:45:31 +0000478 DeclarationName() /*AllocType.getAsString()*/,
479 /*DirectInit=*/true))
Sebastian Redlf53597f2009-03-15 17:47:39 +0000480 return ExprError();
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000481 } else {
Sebastian Redlf53597f2009-03-15 17:47:39 +0000482 return ExprError(Diag(StartLoc,
483 diag::err_builtin_direct_init_more_than_one_arg)
484 << SourceRange(ConstructorLParen, ConstructorRParen));
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000485 }
486 }
487
488 // FIXME: Also check that the destructor is accessible. (C++ 5.3.4p16)
Douglas Gregor089407b2009-10-17 21:40:42 +0000489
Sebastian Redlf53597f2009-03-15 17:47:39 +0000490 PlacementArgs.release();
491 ConstructorArgs.release();
Douglas Gregor3433cf72009-05-21 00:00:09 +0000492 ArraySizeE.release();
Sebastian Redlf53597f2009-03-15 17:47:39 +0000493 return Owned(new (Context) CXXNewExpr(UseGlobal, OperatorNew, PlaceArgs,
Ted Kremenek8189cde2009-02-07 01:47:29 +0000494 NumPlaceArgs, ParenTypeId, ArraySize, Constructor, Init,
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000495 ConsArgs, NumConsArgs, OperatorDelete, ResultType,
Mike Stump1eb44332009-09-09 15:08:12 +0000496 StartLoc, Init ? ConstructorRParen : SourceLocation()));
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000497}
498
499/// CheckAllocatedType - Checks that a type is suitable as the allocated type
500/// in a new-expression.
501/// dimension off and stores the size expression in ArraySize.
Douglas Gregor3433cf72009-05-21 00:00:09 +0000502bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +0000503 SourceRange R) {
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000504 // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an
505 // abstract class type or array thereof.
Douglas Gregore7450f52009-03-24 19:52:54 +0000506 if (AllocType->isFunctionType())
Douglas Gregor3433cf72009-05-21 00:00:09 +0000507 return Diag(Loc, diag::err_bad_new_type)
508 << AllocType << 0 << R;
Douglas Gregore7450f52009-03-24 19:52:54 +0000509 else if (AllocType->isReferenceType())
Douglas Gregor3433cf72009-05-21 00:00:09 +0000510 return Diag(Loc, diag::err_bad_new_type)
511 << AllocType << 1 << R;
Douglas Gregore7450f52009-03-24 19:52:54 +0000512 else if (!AllocType->isDependentType() &&
Douglas Gregor3433cf72009-05-21 00:00:09 +0000513 RequireCompleteType(Loc, AllocType,
Anders Carlssonb7906612009-08-26 23:45:07 +0000514 PDiag(diag::err_new_incomplete_type)
515 << R))
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000516 return true;
Douglas Gregor3433cf72009-05-21 00:00:09 +0000517 else if (RequireNonAbstractType(Loc, AllocType,
Douglas Gregore7450f52009-03-24 19:52:54 +0000518 diag::err_allocation_of_abstract_type))
519 return true;
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000520
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000521 return false;
522}
523
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000524/// FindAllocationFunctions - Finds the overloads of operator new and delete
525/// that are appropriate for the allocation.
Sebastian Redl00e68e22009-02-09 18:24:27 +0000526bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
527 bool UseGlobal, QualType AllocType,
528 bool IsArray, Expr **PlaceArgs,
529 unsigned NumPlaceArgs,
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000530 FunctionDecl *&OperatorNew,
Mike Stump1eb44332009-09-09 15:08:12 +0000531 FunctionDecl *&OperatorDelete) {
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000532 // --- Choosing an allocation function ---
533 // C++ 5.3.4p8 - 14 & 18
534 // 1) If UseGlobal is true, only look in the global scope. Else, also look
535 // in the scope of the allocated class.
536 // 2) If an array size is given, look for operator new[], else look for
537 // operator new.
538 // 3) The first argument is always size_t. Append the arguments from the
539 // placement form.
540 // FIXME: Also find the appropriate delete operator.
541
542 llvm::SmallVector<Expr*, 8> AllocArgs(1 + NumPlaceArgs);
543 // We don't care about the actual value of this argument.
544 // FIXME: Should the Sema create the expression and embed it in the syntax
545 // tree? Or should the consumer just recalculate the value?
Anders Carlssond67c4c32009-08-16 20:29:29 +0000546 IntegerLiteral Size(llvm::APInt::getNullValue(
547 Context.Target.getPointerWidth(0)),
548 Context.getSizeType(),
549 SourceLocation());
550 AllocArgs[0] = &Size;
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000551 std::copy(PlaceArgs, PlaceArgs + NumPlaceArgs, AllocArgs.begin() + 1);
552
553 DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName(
554 IsArray ? OO_Array_New : OO_New);
555 if (AllocType->isRecordType() && !UseGlobal) {
Mike Stump1eb44332009-09-09 15:08:12 +0000556 CXXRecordDecl *Record
Ted Kremenek6217b802009-07-29 21:53:49 +0000557 = cast<CXXRecordDecl>(AllocType->getAs<RecordType>()->getDecl());
Sebastian Redl7f662392008-12-04 22:20:51 +0000558 // FIXME: We fail to find inherited overloads.
Sebastian Redl00e68e22009-02-09 18:24:27 +0000559 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
Sebastian Redl7f662392008-12-04 22:20:51 +0000560 AllocArgs.size(), Record, /*AllowMissing=*/true,
561 OperatorNew))
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000562 return true;
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000563 }
564 if (!OperatorNew) {
565 // Didn't find a member overload. Look for a global one.
566 DeclareGlobalNewDelete();
Sebastian Redl7f662392008-12-04 22:20:51 +0000567 DeclContext *TUDecl = Context.getTranslationUnitDecl();
Sebastian Redl00e68e22009-02-09 18:24:27 +0000568 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
Sebastian Redl7f662392008-12-04 22:20:51 +0000569 AllocArgs.size(), TUDecl, /*AllowMissing=*/false,
570 OperatorNew))
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000571 return true;
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000572 }
573
Anders Carlssond9583892009-05-31 20:26:12 +0000574 // FindAllocationOverload can change the passed in arguments, so we need to
575 // copy them back.
576 if (NumPlaceArgs > 0)
577 std::copy(&AllocArgs[1], AllocArgs.end(), PlaceArgs);
Mike Stump1eb44332009-09-09 15:08:12 +0000578
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000579 return false;
580}
581
Sebastian Redl7f662392008-12-04 22:20:51 +0000582/// FindAllocationOverload - Find an fitting overload for the allocation
583/// function in the specified scope.
Sebastian Redl00e68e22009-02-09 18:24:27 +0000584bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
585 DeclarationName Name, Expr** Args,
586 unsigned NumArgs, DeclContext *Ctx,
Mike Stump1eb44332009-09-09 15:08:12 +0000587 bool AllowMissing, FunctionDecl *&Operator) {
John McCalla24dc2e2009-11-17 02:14:36 +0000588 LookupResult R(*this, Name, StartLoc, LookupOrdinaryName);
589 LookupQualifiedName(R, Ctx);
John McCallf36e02d2009-10-09 21:13:30 +0000590 if (R.empty()) {
Sebastian Redl7f662392008-12-04 22:20:51 +0000591 if (AllowMissing)
592 return false;
Sebastian Redl7f662392008-12-04 22:20:51 +0000593 return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
Chris Lattner4330d652009-02-17 07:29:20 +0000594 << Name << Range;
Sebastian Redl7f662392008-12-04 22:20:51 +0000595 }
596
John McCallf36e02d2009-10-09 21:13:30 +0000597 // FIXME: handle ambiguity
598
Sebastian Redl7f662392008-12-04 22:20:51 +0000599 OverloadCandidateSet Candidates;
Douglas Gregor5d64e5b2009-09-30 00:03:47 +0000600 for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end();
601 Alloc != AllocEnd; ++Alloc) {
Douglas Gregor3fc749d2008-12-23 00:26:44 +0000602 // Even member operator new/delete are implicitly treated as
603 // static, so don't use AddMemberCandidate.
Douglas Gregor90916562009-09-29 18:16:17 +0000604 if (FunctionDecl *Fn = dyn_cast<FunctionDecl>(*Alloc)) {
Douglas Gregor3fc749d2008-12-23 00:26:44 +0000605 AddOverloadCandidate(Fn, Args, NumArgs, Candidates,
606 /*SuppressUserConversions=*/false);
Douglas Gregor90916562009-09-29 18:16:17 +0000607 continue;
608 }
609
610 // FIXME: Handle function templates
Sebastian Redl7f662392008-12-04 22:20:51 +0000611 }
612
613 // Do the resolution.
614 OverloadCandidateSet::iterator Best;
Douglas Gregore0762c92009-06-19 23:52:42 +0000615 switch(BestViableFunction(Candidates, StartLoc, Best)) {
Sebastian Redl7f662392008-12-04 22:20:51 +0000616 case OR_Success: {
617 // Got one!
618 FunctionDecl *FnDecl = Best->Function;
619 // The first argument is size_t, and the first parameter must be size_t,
620 // too. This is checked on declaration and can be assumed. (It can't be
621 // asserted on, though, since invalid decls are left in there.)
Fariborz Jahanian048f52a2009-11-24 18:29:37 +0000622 // Whatch out for variadic allocator function.
623 unsigned NumArgsInFnDecl = FnDecl->getNumParams();
624 for (unsigned i = 0; (i < NumArgs && i < NumArgsInFnDecl); ++i) {
Sebastian Redl7f662392008-12-04 22:20:51 +0000625 // FIXME: Passing word to diagnostic.
Anders Carlssonfc27d262009-05-31 19:49:47 +0000626 if (PerformCopyInitialization(Args[i],
Sebastian Redl7f662392008-12-04 22:20:51 +0000627 FnDecl->getParamDecl(i)->getType(),
628 "passing"))
629 return true;
630 }
631 Operator = FnDecl;
632 return false;
633 }
634
635 case OR_No_Viable_Function:
Sebastian Redl7f662392008-12-04 22:20:51 +0000636 Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
Chris Lattner4330d652009-02-17 07:29:20 +0000637 << Name << Range;
Sebastian Redl7f662392008-12-04 22:20:51 +0000638 PrintOverloadCandidates(Candidates, /*OnlyViable=*/false);
639 return true;
640
641 case OR_Ambiguous:
Sebastian Redl7f662392008-12-04 22:20:51 +0000642 Diag(StartLoc, diag::err_ovl_ambiguous_call)
Sebastian Redl00e68e22009-02-09 18:24:27 +0000643 << Name << Range;
Sebastian Redl7f662392008-12-04 22:20:51 +0000644 PrintOverloadCandidates(Candidates, /*OnlyViable=*/true);
645 return true;
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000646
647 case OR_Deleted:
648 Diag(StartLoc, diag::err_ovl_deleted_call)
649 << Best->Function->isDeleted()
650 << Name << Range;
651 PrintOverloadCandidates(Candidates, /*OnlyViable=*/true);
652 return true;
Sebastian Redl7f662392008-12-04 22:20:51 +0000653 }
654 assert(false && "Unreachable, bad result from BestViableFunction");
655 return true;
656}
657
658
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000659/// DeclareGlobalNewDelete - Declare the global forms of operator new and
660/// delete. These are:
661/// @code
662/// void* operator new(std::size_t) throw(std::bad_alloc);
663/// void* operator new[](std::size_t) throw(std::bad_alloc);
664/// void operator delete(void *) throw();
665/// void operator delete[](void *) throw();
666/// @endcode
667/// Note that the placement and nothrow forms of new are *not* implicitly
668/// declared. Their use requires including \<new\>.
Mike Stump1eb44332009-09-09 15:08:12 +0000669void Sema::DeclareGlobalNewDelete() {
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000670 if (GlobalNewDeleteDeclared)
671 return;
Douglas Gregor7adb10f2009-09-15 22:30:29 +0000672
673 // C++ [basic.std.dynamic]p2:
674 // [...] The following allocation and deallocation functions (18.4) are
675 // implicitly declared in global scope in each translation unit of a
676 // program
677 //
678 // void* operator new(std::size_t) throw(std::bad_alloc);
679 // void* operator new[](std::size_t) throw(std::bad_alloc);
680 // void operator delete(void*) throw();
681 // void operator delete[](void*) throw();
682 //
683 // These implicit declarations introduce only the function names operator
684 // new, operator new[], operator delete, operator delete[].
685 //
686 // Here, we need to refer to std::bad_alloc, so we will implicitly declare
687 // "std" or "bad_alloc" as necessary to form the exception specification.
688 // However, we do not make these implicit declarations visible to name
689 // lookup.
690 if (!StdNamespace) {
691 // The "std" namespace has not yet been defined, so build one implicitly.
692 StdNamespace = NamespaceDecl::Create(Context,
693 Context.getTranslationUnitDecl(),
694 SourceLocation(),
695 &PP.getIdentifierTable().get("std"));
696 StdNamespace->setImplicit(true);
697 }
698
699 if (!StdBadAlloc) {
700 // The "std::bad_alloc" class has not yet been declared, so build it
701 // implicitly.
702 StdBadAlloc = CXXRecordDecl::Create(Context, TagDecl::TK_class,
703 StdNamespace,
704 SourceLocation(),
705 &PP.getIdentifierTable().get("bad_alloc"),
706 SourceLocation(), 0);
707 StdBadAlloc->setImplicit(true);
708 }
709
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000710 GlobalNewDeleteDeclared = true;
711
712 QualType VoidPtr = Context.getPointerType(Context.VoidTy);
713 QualType SizeT = Context.getSizeType();
714
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000715 DeclareGlobalAllocationFunction(
716 Context.DeclarationNames.getCXXOperatorName(OO_New),
717 VoidPtr, SizeT);
718 DeclareGlobalAllocationFunction(
719 Context.DeclarationNames.getCXXOperatorName(OO_Array_New),
720 VoidPtr, SizeT);
721 DeclareGlobalAllocationFunction(
722 Context.DeclarationNames.getCXXOperatorName(OO_Delete),
723 Context.VoidTy, VoidPtr);
724 DeclareGlobalAllocationFunction(
725 Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete),
726 Context.VoidTy, VoidPtr);
727}
728
729/// DeclareGlobalAllocationFunction - Declares a single implicit global
730/// allocation function if it doesn't already exist.
731void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
Mike Stump1eb44332009-09-09 15:08:12 +0000732 QualType Return, QualType Argument) {
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000733 DeclContext *GlobalCtx = Context.getTranslationUnitDecl();
734
735 // Check if this function is already declared.
Douglas Gregor6ed40e32008-12-23 21:05:05 +0000736 {
Douglas Gregor5cc37092008-12-23 22:05:29 +0000737 DeclContext::lookup_iterator Alloc, AllocEnd;
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +0000738 for (llvm::tie(Alloc, AllocEnd) = GlobalCtx->lookup(Name);
Douglas Gregor6ed40e32008-12-23 21:05:05 +0000739 Alloc != AllocEnd; ++Alloc) {
740 // FIXME: Do we need to check for default arguments here?
741 FunctionDecl *Func = cast<FunctionDecl>(*Alloc);
742 if (Func->getNumParams() == 1 &&
Ted Kremenek8189cde2009-02-07 01:47:29 +0000743 Context.getCanonicalType(Func->getParamDecl(0)->getType())==Argument)
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000744 return;
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000745 }
746 }
747
Douglas Gregor7adb10f2009-09-15 22:30:29 +0000748 QualType BadAllocType;
749 bool HasBadAllocExceptionSpec
750 = (Name.getCXXOverloadedOperator() == OO_New ||
751 Name.getCXXOverloadedOperator() == OO_Array_New);
752 if (HasBadAllocExceptionSpec) {
753 assert(StdBadAlloc && "Must have std::bad_alloc declared");
754 BadAllocType = Context.getTypeDeclType(StdBadAlloc);
755 }
756
757 QualType FnType = Context.getFunctionType(Return, &Argument, 1, false, 0,
758 true, false,
759 HasBadAllocExceptionSpec? 1 : 0,
760 &BadAllocType);
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000761 FunctionDecl *Alloc =
762 FunctionDecl::Create(Context, GlobalCtx, SourceLocation(), Name,
John McCalla93c9342009-12-07 02:54:59 +0000763 FnType, /*TInfo=*/0, FunctionDecl::None, false, true);
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000764 Alloc->setImplicit();
765 ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(),
John McCalla93c9342009-12-07 02:54:59 +0000766 0, Argument, /*TInfo=*/0,
Argyrios Kyrtzidisa1d56622009-08-19 01:27:57 +0000767 VarDecl::None, 0);
Ted Kremenekfc767612009-01-14 00:42:25 +0000768 Alloc->setParams(Context, &Param, 1);
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000769
Douglas Gregor6ed40e32008-12-23 21:05:05 +0000770 // FIXME: Also add this declaration to the IdentifierResolver, but
771 // make sure it is at the end of the chain to coincide with the
772 // global scope.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +0000773 ((DeclContext *)TUScope->getEntity())->addDecl(Alloc);
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000774}
775
Anders Carlsson78f74552009-11-15 18:45:20 +0000776bool Sema::FindDeallocationFunction(SourceLocation StartLoc, CXXRecordDecl *RD,
777 DeclarationName Name,
Anders Carlsson5ec02ae2009-12-02 17:15:43 +0000778 FunctionDecl* &Operator) {
John McCalla24dc2e2009-11-17 02:14:36 +0000779 LookupResult Found(*this, Name, StartLoc, LookupOrdinaryName);
Anders Carlsson78f74552009-11-15 18:45:20 +0000780 // Try to find operator delete/operator delete[] in class scope.
John McCalla24dc2e2009-11-17 02:14:36 +0000781 LookupQualifiedName(Found, RD);
Anders Carlsson78f74552009-11-15 18:45:20 +0000782
John McCalla24dc2e2009-11-17 02:14:36 +0000783 if (Found.isAmbiguous())
Anders Carlsson78f74552009-11-15 18:45:20 +0000784 return true;
Anders Carlsson78f74552009-11-15 18:45:20 +0000785
786 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
787 F != FEnd; ++F) {
788 if (CXXMethodDecl *Delete = dyn_cast<CXXMethodDecl>(*F))
789 if (Delete->isUsualDeallocationFunction()) {
790 Operator = Delete;
791 return false;
792 }
793 }
794
795 // We did find operator delete/operator delete[] declarations, but
796 // none of them were suitable.
797 if (!Found.empty()) {
798 Diag(StartLoc, diag::err_no_suitable_delete_member_function_found)
799 << Name << RD;
800
801 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
802 F != FEnd; ++F) {
803 Diag((*F)->getLocation(),
804 diag::note_delete_member_function_declared_here)
805 << Name;
806 }
807
808 return true;
809 }
810
811 // Look for a global declaration.
812 DeclareGlobalNewDelete();
813 DeclContext *TUDecl = Context.getTranslationUnitDecl();
814
815 CXXNullPtrLiteralExpr Null(Context.VoidPtrTy, SourceLocation());
816 Expr* DeallocArgs[1];
817 DeallocArgs[0] = &Null;
818 if (FindAllocationOverload(StartLoc, SourceRange(), Name,
819 DeallocArgs, 1, TUDecl, /*AllowMissing=*/false,
820 Operator))
821 return true;
822
823 assert(Operator && "Did not find a deallocation function!");
824 return false;
825}
826
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000827/// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
828/// @code ::delete ptr; @endcode
829/// or
830/// @code delete [] ptr; @endcode
Sebastian Redlf53597f2009-03-15 17:47:39 +0000831Action::OwningExprResult
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000832Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
Mike Stump1eb44332009-09-09 15:08:12 +0000833 bool ArrayForm, ExprArg Operand) {
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000834 // C++ [expr.delete]p1:
835 // The operand shall have a pointer type, or a class type having a single
836 // conversion function to a pointer type. The result has type void.
837 //
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000838 // DR599 amends "pointer type" to "pointer to object type" in both cases.
839
Anders Carlssond67c4c32009-08-16 20:29:29 +0000840 FunctionDecl *OperatorDelete = 0;
Mike Stump1eb44332009-09-09 15:08:12 +0000841
Sebastian Redlf53597f2009-03-15 17:47:39 +0000842 Expr *Ex = (Expr *)Operand.get();
Sebastian Redl28507842009-02-26 14:39:58 +0000843 if (!Ex->isTypeDependent()) {
844 QualType Type = Ex->getType();
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000845
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000846 if (const RecordType *Record = Type->getAs<RecordType>()) {
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000847 llvm::SmallVector<CXXConversionDecl *, 4> ObjectPtrConversions;
Fariborz Jahanian53462782009-09-11 21:44:33 +0000848 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
John McCallba135432009-11-21 08:51:07 +0000849 const UnresolvedSet *Conversions = RD->getVisibleConversionFunctions();
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000850
John McCallba135432009-11-21 08:51:07 +0000851 for (UnresolvedSet::iterator I = Conversions->begin(),
852 E = Conversions->end(); I != E; ++I) {
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000853 // Skip over templated conversion functions; they aren't considered.
John McCallba135432009-11-21 08:51:07 +0000854 if (isa<FunctionTemplateDecl>(*I))
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000855 continue;
856
John McCallba135432009-11-21 08:51:07 +0000857 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*I);
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000858
859 QualType ConvType = Conv->getConversionType().getNonReferenceType();
860 if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>())
861 if (ConvPtrType->getPointeeType()->isObjectType())
Fariborz Jahanian8b915e72009-09-15 22:15:23 +0000862 ObjectPtrConversions.push_back(Conv);
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000863 }
Fariborz Jahanian8b915e72009-09-15 22:15:23 +0000864 if (ObjectPtrConversions.size() == 1) {
865 // We have a single conversion to a pointer-to-object type. Perform
866 // that conversion.
867 Operand.release();
868 if (!PerformImplicitConversion(Ex,
869 ObjectPtrConversions.front()->getConversionType(),
870 "converting")) {
871 Operand = Owned(Ex);
872 Type = Ex->getType();
873 }
874 }
875 else if (ObjectPtrConversions.size() > 1) {
876 Diag(StartLoc, diag::err_ambiguous_delete_operand)
877 << Type << Ex->getSourceRange();
878 for (unsigned i= 0; i < ObjectPtrConversions.size(); i++) {
879 CXXConversionDecl *Conv = ObjectPtrConversions[i];
880 Diag(Conv->getLocation(), diag::err_ovl_candidate);
881 }
882 return ExprError();
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000883 }
Sebastian Redl28507842009-02-26 14:39:58 +0000884 }
885
Sebastian Redlf53597f2009-03-15 17:47:39 +0000886 if (!Type->isPointerType())
887 return ExprError(Diag(StartLoc, diag::err_delete_operand)
888 << Type << Ex->getSourceRange());
Sebastian Redl28507842009-02-26 14:39:58 +0000889
Ted Kremenek6217b802009-07-29 21:53:49 +0000890 QualType Pointee = Type->getAs<PointerType>()->getPointeeType();
Douglas Gregor8dcb29d2009-03-24 20:13:58 +0000891 if (Pointee->isFunctionType() || Pointee->isVoidType())
Sebastian Redlf53597f2009-03-15 17:47:39 +0000892 return ExprError(Diag(StartLoc, diag::err_delete_operand)
893 << Type << Ex->getSourceRange());
Douglas Gregor8dcb29d2009-03-24 20:13:58 +0000894 else if (!Pointee->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +0000895 RequireCompleteType(StartLoc, Pointee,
Anders Carlssonb7906612009-08-26 23:45:07 +0000896 PDiag(diag::warn_delete_incomplete)
897 << Ex->getSourceRange()))
Douglas Gregor8dcb29d2009-03-24 20:13:58 +0000898 return ExprError();
Sebastian Redl28507842009-02-26 14:39:58 +0000899
Douglas Gregor1070c9f2009-09-29 21:38:53 +0000900 // C++ [expr.delete]p2:
901 // [Note: a pointer to a const type can be the operand of a
902 // delete-expression; it is not necessary to cast away the constness
903 // (5.2.11) of the pointer expression before it is used as the operand
904 // of the delete-expression. ]
905 ImpCastExprToType(Ex, Context.getPointerType(Context.VoidTy),
906 CastExpr::CK_NoOp);
907
908 // Update the operand.
909 Operand.take();
910 Operand = ExprArg(*this, Ex);
911
Anders Carlssond67c4c32009-08-16 20:29:29 +0000912 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
913 ArrayForm ? OO_Array_Delete : OO_Delete);
914
Anders Carlsson78f74552009-11-15 18:45:20 +0000915 if (const RecordType *RT = Pointee->getAs<RecordType>()) {
916 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
917
918 if (!UseGlobal &&
919 FindDeallocationFunction(StartLoc, RD, DeleteName, OperatorDelete))
Anders Carlsson0ba63ea2009-11-14 03:17:38 +0000920 return ExprError();
Anders Carlsson0ba63ea2009-11-14 03:17:38 +0000921
Anders Carlsson78f74552009-11-15 18:45:20 +0000922 if (!RD->hasTrivialDestructor())
923 if (const CXXDestructorDecl *Dtor = RD->getDestructor(Context))
Mike Stump1eb44332009-09-09 15:08:12 +0000924 MarkDeclarationReferenced(StartLoc,
Fariborz Jahanian34374e62009-09-03 23:18:17 +0000925 const_cast<CXXDestructorDecl*>(Dtor));
Anders Carlssond67c4c32009-08-16 20:29:29 +0000926 }
Anders Carlsson78f74552009-11-15 18:45:20 +0000927
Anders Carlssond67c4c32009-08-16 20:29:29 +0000928 if (!OperatorDelete) {
Anders Carlsson78f74552009-11-15 18:45:20 +0000929 // Look for a global declaration.
Anders Carlssond67c4c32009-08-16 20:29:29 +0000930 DeclareGlobalNewDelete();
931 DeclContext *TUDecl = Context.getTranslationUnitDecl();
Mike Stump1eb44332009-09-09 15:08:12 +0000932 if (FindAllocationOverload(StartLoc, SourceRange(), DeleteName,
Douglas Gregor90916562009-09-29 18:16:17 +0000933 &Ex, 1, TUDecl, /*AllowMissing=*/false,
Anders Carlssond67c4c32009-08-16 20:29:29 +0000934 OperatorDelete))
935 return ExprError();
936 }
Mike Stump1eb44332009-09-09 15:08:12 +0000937
Sebastian Redl28507842009-02-26 14:39:58 +0000938 // FIXME: Check access and ambiguity of operator delete and destructor.
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000939 }
940
Sebastian Redlf53597f2009-03-15 17:47:39 +0000941 Operand.release();
942 return Owned(new (Context) CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm,
Anders Carlssond67c4c32009-08-16 20:29:29 +0000943 OperatorDelete, Ex, StartLoc));
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000944}
945
Douglas Gregor8cfe5a72009-11-23 23:44:04 +0000946/// \brief Check the use of the given variable as a C++ condition in an if,
947/// while, do-while, or switch statement.
948Action::OwningExprResult Sema::CheckConditionVariable(VarDecl *ConditionVar) {
949 QualType T = ConditionVar->getType();
950
951 // C++ [stmt.select]p2:
952 // The declarator shall not specify a function or an array.
953 if (T->isFunctionType())
954 return ExprError(Diag(ConditionVar->getLocation(),
955 diag::err_invalid_use_of_function_type)
956 << ConditionVar->getSourceRange());
957 else if (T->isArrayType())
958 return ExprError(Diag(ConditionVar->getLocation(),
959 diag::err_invalid_use_of_array_type)
960 << ConditionVar->getSourceRange());
Douglas Gregora7605db2009-11-24 16:07:02 +0000961
Douglas Gregor8cfe5a72009-11-23 23:44:04 +0000962 return Owned(DeclRefExpr::Create(Context, 0, SourceRange(), ConditionVar,
963 ConditionVar->getLocation(),
964 ConditionVar->getType().getNonReferenceType()));
965}
966
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000967/// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
968bool Sema::CheckCXXBooleanCondition(Expr *&CondExpr) {
969 // C++ 6.4p4:
970 // The value of a condition that is an initialized declaration in a statement
971 // other than a switch statement is the value of the declared variable
972 // implicitly converted to type bool. If that conversion is ill-formed, the
973 // program is ill-formed.
974 // The value of a condition that is an expression is the value of the
975 // expression, implicitly converted to bool.
976 //
Douglas Gregor09f41cf2009-01-14 15:45:31 +0000977 return PerformContextuallyConvertToBool(CondExpr);
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000978}
Douglas Gregor77a52232008-09-12 00:47:35 +0000979
980/// Helper function to determine whether this is the (deprecated) C++
981/// conversion from a string literal to a pointer to non-const char or
982/// non-const wchar_t (for narrow and wide string literals,
983/// respectively).
Mike Stump1eb44332009-09-09 15:08:12 +0000984bool
Douglas Gregor77a52232008-09-12 00:47:35 +0000985Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
986 // Look inside the implicit cast, if it exists.
987 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From))
988 From = Cast->getSubExpr();
989
990 // A string literal (2.13.4) that is not a wide string literal can
991 // be converted to an rvalue of type "pointer to char"; a wide
992 // string literal can be converted to an rvalue of type "pointer
993 // to wchar_t" (C++ 4.2p2).
994 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From))
Ted Kremenek6217b802009-07-29 21:53:49 +0000995 if (const PointerType *ToPtrType = ToType->getAs<PointerType>())
Mike Stump1eb44332009-09-09 15:08:12 +0000996 if (const BuiltinType *ToPointeeType
John McCall183700f2009-09-21 23:43:11 +0000997 = ToPtrType->getPointeeType()->getAs<BuiltinType>()) {
Douglas Gregor77a52232008-09-12 00:47:35 +0000998 // This conversion is considered only when there is an
999 // explicit appropriate pointer target type (C++ 4.2p2).
John McCall0953e762009-09-24 19:53:00 +00001000 if (!ToPtrType->getPointeeType().hasQualifiers() &&
Douglas Gregor77a52232008-09-12 00:47:35 +00001001 ((StrLit->isWide() && ToPointeeType->isWideCharType()) ||
1002 (!StrLit->isWide() &&
1003 (ToPointeeType->getKind() == BuiltinType::Char_U ||
1004 ToPointeeType->getKind() == BuiltinType::Char_S))))
1005 return true;
1006 }
1007
1008 return false;
1009}
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001010
1011/// PerformImplicitConversion - Perform an implicit conversion of the
1012/// expression From to the type ToType. Returns true if there was an
1013/// error, false otherwise. The expression From is replaced with the
Douglas Gregor45920e82008-12-19 17:40:08 +00001014/// converted expression. Flavor is the kind of conversion we're
Douglas Gregor09f41cf2009-01-14 15:45:31 +00001015/// performing, used in the error message. If @p AllowExplicit,
Sebastian Redle2b68332009-04-12 17:16:29 +00001016/// explicit user-defined conversions are permitted. @p Elidable should be true
1017/// when called for copies which may be elided (C++ 12.8p15). C++0x overload
1018/// resolution works differently in that case.
1019bool
Douglas Gregor45920e82008-12-19 17:40:08 +00001020Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
Sebastian Redle2b68332009-04-12 17:16:29 +00001021 const char *Flavor, bool AllowExplicit,
Mike Stump1eb44332009-09-09 15:08:12 +00001022 bool Elidable) {
Sebastian Redle2b68332009-04-12 17:16:29 +00001023 ImplicitConversionSequence ICS;
Fariborz Jahanian51bebc82009-09-23 20:55:32 +00001024 return PerformImplicitConversion(From, ToType, Flavor, AllowExplicit,
1025 Elidable, ICS);
1026}
1027
1028bool
1029Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
1030 const char *Flavor, bool AllowExplicit,
1031 bool Elidable,
1032 ImplicitConversionSequence& ICS) {
Sebastian Redle2b68332009-04-12 17:16:29 +00001033 ICS.ConversionKind = ImplicitConversionSequence::BadConversion;
1034 if (Elidable && getLangOptions().CPlusPlus0x) {
Mike Stump1eb44332009-09-09 15:08:12 +00001035 ICS = TryImplicitConversion(From, ToType,
Anders Carlssonda7a18b2009-08-27 17:24:15 +00001036 /*SuppressUserConversions=*/false,
Mike Stump1eb44332009-09-09 15:08:12 +00001037 AllowExplicit,
Anders Carlsson08972922009-08-28 15:33:32 +00001038 /*ForceRValue=*/true,
1039 /*InOverloadResolution=*/false);
Sebastian Redle2b68332009-04-12 17:16:29 +00001040 }
1041 if (ICS.ConversionKind == ImplicitConversionSequence::BadConversion) {
Mike Stump1eb44332009-09-09 15:08:12 +00001042 ICS = TryImplicitConversion(From, ToType,
Anders Carlssonda7a18b2009-08-27 17:24:15 +00001043 /*SuppressUserConversions=*/false,
1044 AllowExplicit,
Anders Carlsson08972922009-08-28 15:33:32 +00001045 /*ForceRValue=*/false,
1046 /*InOverloadResolution=*/false);
Sebastian Redle2b68332009-04-12 17:16:29 +00001047 }
Douglas Gregor09f41cf2009-01-14 15:45:31 +00001048 return PerformImplicitConversion(From, ToType, ICS, Flavor);
1049}
1050
Fariborz Jahanian93034ca2009-10-16 19:20:59 +00001051/// BuildCXXDerivedToBaseExpr - This routine generates the suitable AST
1052/// for the derived to base conversion of the expression 'From'. All
1053/// necessary information is passed in ICS.
1054bool
1055Sema::BuildCXXDerivedToBaseExpr(Expr *&From, CastExpr::CastKind CastKind,
1056 const ImplicitConversionSequence& ICS,
1057 const char *Flavor) {
1058 QualType BaseType =
1059 QualType::getFromOpaquePtr(ICS.UserDefined.After.ToTypePtr);
1060 // Must do additional defined to base conversion.
1061 QualType DerivedType =
1062 QualType::getFromOpaquePtr(ICS.UserDefined.After.FromTypePtr);
1063
1064 From = new (Context) ImplicitCastExpr(
1065 DerivedType.getNonReferenceType(),
1066 CastKind,
1067 From,
1068 DerivedType->isLValueReferenceType());
1069 From = new (Context) ImplicitCastExpr(BaseType.getNonReferenceType(),
1070 CastExpr::CK_DerivedToBase, From,
1071 BaseType->isLValueReferenceType());
1072 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
1073 OwningExprResult FromResult =
1074 BuildCXXConstructExpr(
1075 ICS.UserDefined.After.CopyConstructor->getLocation(),
1076 BaseType,
1077 ICS.UserDefined.After.CopyConstructor,
1078 MultiExprArg(*this, (void **)&From, 1));
1079 if (FromResult.isInvalid())
1080 return true;
1081 From = FromResult.takeAs<Expr>();
1082 return false;
1083}
1084
Douglas Gregor09f41cf2009-01-14 15:45:31 +00001085/// PerformImplicitConversion - Perform an implicit conversion of the
1086/// expression From to the type ToType using the pre-computed implicit
1087/// conversion sequence ICS. Returns true if there was an error, false
1088/// otherwise. The expression From is replaced with the converted
1089/// expression. Flavor is the kind of conversion we're performing,
1090/// used in the error message.
1091bool
1092Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
1093 const ImplicitConversionSequence &ICS,
Sebastian Redla82e4ae2009-11-14 21:15:49 +00001094 const char* Flavor, bool IgnoreBaseAccess) {
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001095 switch (ICS.ConversionKind) {
1096 case ImplicitConversionSequence::StandardConversion:
Sebastian Redla82e4ae2009-11-14 21:15:49 +00001097 if (PerformImplicitConversion(From, ToType, ICS.Standard, Flavor,
1098 IgnoreBaseAccess))
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001099 return true;
1100 break;
1101
Anders Carlssonf6c213a2009-09-15 06:28:28 +00001102 case ImplicitConversionSequence::UserDefinedConversion: {
1103
Fariborz Jahanian7fe5d722009-08-28 22:04:50 +00001104 FunctionDecl *FD = ICS.UserDefined.ConversionFunction;
1105 CastExpr::CastKind CastKind = CastExpr::CK_Unknown;
Anders Carlssonf6c213a2009-09-15 06:28:28 +00001106 QualType BeforeToType;
1107 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) {
Fariborz Jahanian7fe5d722009-08-28 22:04:50 +00001108 CastKind = CastExpr::CK_UserDefinedConversion;
Anders Carlssonf6c213a2009-09-15 06:28:28 +00001109
1110 // If the user-defined conversion is specified by a conversion function,
1111 // the initial standard conversion sequence converts the source type to
1112 // the implicit object parameter of the conversion function.
1113 BeforeToType = Context.getTagDeclType(Conv->getParent());
1114 } else if (const CXXConstructorDecl *Ctor =
1115 dyn_cast<CXXConstructorDecl>(FD)) {
Anders Carlsson0aebc812009-09-09 21:33:21 +00001116 CastKind = CastExpr::CK_ConstructorConversion;
Fariborz Jahanian966256a2009-11-06 00:23:08 +00001117 // Do no conversion if dealing with ... for the first conversion.
Douglas Gregore44201a2009-11-20 02:31:03 +00001118 if (!ICS.UserDefined.EllipsisConversion) {
Fariborz Jahanian966256a2009-11-06 00:23:08 +00001119 // If the user-defined conversion is specified by a constructor, the
1120 // initial standard conversion sequence converts the source type to the
1121 // type required by the argument of the constructor
Douglas Gregore44201a2009-11-20 02:31:03 +00001122 BeforeToType = Ctor->getParamDecl(0)->getType().getNonReferenceType();
1123 }
Anders Carlssonf6c213a2009-09-15 06:28:28 +00001124 }
Anders Carlsson0aebc812009-09-09 21:33:21 +00001125 else
1126 assert(0 && "Unknown conversion function kind!");
Fariborz Jahanian966256a2009-11-06 00:23:08 +00001127 // Whatch out for elipsis conversion.
Fariborz Jahanian4c0cea22009-11-06 00:55:14 +00001128 if (!ICS.UserDefined.EllipsisConversion) {
Fariborz Jahanian966256a2009-11-06 00:23:08 +00001129 if (PerformImplicitConversion(From, BeforeToType,
Sebastian Redla82e4ae2009-11-14 21:15:49 +00001130 ICS.UserDefined.Before, "converting",
1131 IgnoreBaseAccess))
Fariborz Jahanian966256a2009-11-06 00:23:08 +00001132 return true;
1133 }
Anders Carlssonf6c213a2009-09-15 06:28:28 +00001134
Anders Carlsson0aebc812009-09-09 21:33:21 +00001135 OwningExprResult CastArg
1136 = BuildCXXCastArgument(From->getLocStart(),
1137 ToType.getNonReferenceType(),
1138 CastKind, cast<CXXMethodDecl>(FD),
1139 Owned(From));
1140
1141 if (CastArg.isInvalid())
1142 return true;
Eli Friedmand8889622009-11-27 04:41:50 +00001143
1144 From = CastArg.takeAs<Expr>();
1145
1146 // FIXME: This and the following if statement shouldn't be necessary, but
1147 // there's some nasty stuff involving MaybeBindToTemporary going on here.
Fariborz Jahanian93034ca2009-10-16 19:20:59 +00001148 if (ICS.UserDefined.After.Second == ICK_Derived_To_Base &&
1149 ICS.UserDefined.After.CopyConstructor) {
Fariborz Jahanian93034ca2009-10-16 19:20:59 +00001150 return BuildCXXDerivedToBaseExpr(From, CastKind, ICS, Flavor);
1151 }
Eli Friedmand8889622009-11-27 04:41:50 +00001152
1153 if (ICS.UserDefined.After.CopyConstructor) {
1154 From = new (Context) ImplicitCastExpr(ToType.getNonReferenceType(),
1155 CastKind, From,
1156 ToType->isLValueReferenceType());
1157 return false;
1158 }
1159
1160 return PerformImplicitConversion(From, ToType, ICS.UserDefined.After,
1161 "converting", IgnoreBaseAccess);
Fariborz Jahanian93034ca2009-10-16 19:20:59 +00001162 }
1163
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001164 case ImplicitConversionSequence::EllipsisConversion:
1165 assert(false && "Cannot perform an ellipsis conversion");
Douglas Gregor60d62c22008-10-31 16:23:19 +00001166 return false;
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001167
1168 case ImplicitConversionSequence::BadConversion:
1169 return true;
1170 }
1171
1172 // Everything went well.
1173 return false;
1174}
1175
1176/// PerformImplicitConversion - Perform an implicit conversion of the
1177/// expression From to the type ToType by following the standard
1178/// conversion sequence SCS. Returns true if there was an error, false
1179/// otherwise. The expression From is replaced with the converted
Douglas Gregor45920e82008-12-19 17:40:08 +00001180/// expression. Flavor is the context in which we're performing this
1181/// conversion, for use in error messages.
Mike Stump1eb44332009-09-09 15:08:12 +00001182bool
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001183Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
Douglas Gregor45920e82008-12-19 17:40:08 +00001184 const StandardConversionSequence& SCS,
Sebastian Redla82e4ae2009-11-14 21:15:49 +00001185 const char *Flavor, bool IgnoreBaseAccess) {
Mike Stump390b4cc2009-05-16 07:39:55 +00001186 // Overall FIXME: we are recomputing too many types here and doing far too
1187 // much extra work. What this means is that we need to keep track of more
1188 // information that is computed when we try the implicit conversion initially,
1189 // so that we don't need to recompute anything here.
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001190 QualType FromType = From->getType();
1191
Douglas Gregor225c41e2008-11-03 19:09:14 +00001192 if (SCS.CopyConstructor) {
Anders Carlsson7c3e8a12009-05-19 04:45:15 +00001193 // FIXME: When can ToType be a reference type?
1194 assert(!ToType->isReferenceType());
Fariborz Jahanianb3c47742009-09-25 18:59:21 +00001195 if (SCS.Second == ICK_Derived_To_Base) {
1196 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
1197 if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor),
1198 MultiExprArg(*this, (void **)&From, 1),
1199 /*FIXME:ConstructLoc*/SourceLocation(),
1200 ConstructorArgs))
1201 return true;
1202 OwningExprResult FromResult =
1203 BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
1204 ToType, SCS.CopyConstructor,
1205 move_arg(ConstructorArgs));
1206 if (FromResult.isInvalid())
1207 return true;
1208 From = FromResult.takeAs<Expr>();
1209 return false;
1210 }
Mike Stump1eb44332009-09-09 15:08:12 +00001211 OwningExprResult FromResult =
1212 BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
1213 ToType, SCS.CopyConstructor,
Anders Carlssonf47511a2009-09-07 22:23:31 +00001214 MultiExprArg(*this, (void**)&From, 1));
Mike Stump1eb44332009-09-09 15:08:12 +00001215
Anders Carlssonda3f4e22009-08-25 05:12:04 +00001216 if (FromResult.isInvalid())
1217 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00001218
Anders Carlssonda3f4e22009-08-25 05:12:04 +00001219 From = FromResult.takeAs<Expr>();
Douglas Gregor225c41e2008-11-03 19:09:14 +00001220 return false;
1221 }
1222
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001223 // Perform the first implicit conversion.
1224 switch (SCS.First) {
1225 case ICK_Identity:
1226 case ICK_Lvalue_To_Rvalue:
1227 // Nothing to do.
1228 break;
1229
1230 case ICK_Array_To_Pointer:
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001231 FromType = Context.getArrayDecayedType(FromType);
Anders Carlsson82495762009-08-08 21:04:35 +00001232 ImpCastExprToType(From, FromType, CastExpr::CK_ArrayToPointerDecay);
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001233 break;
1234
1235 case ICK_Function_To_Pointer:
Douglas Gregor063daf62009-03-13 18:40:31 +00001236 if (Context.getCanonicalType(FromType) == Context.OverloadTy) {
Douglas Gregor904eed32008-11-10 20:40:00 +00001237 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType, true);
1238 if (!Fn)
1239 return true;
1240
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001241 if (DiagnoseUseOfDecl(Fn, From->getSourceRange().getBegin()))
1242 return true;
1243
Anders Carlsson96ad5332009-10-21 17:16:23 +00001244 From = FixOverloadedFunctionReference(From, Fn);
Douglas Gregor904eed32008-11-10 20:40:00 +00001245 FromType = From->getType();
Anders Carlsson96ad5332009-10-21 17:16:23 +00001246
Sebastian Redl759986e2009-10-17 20:50:27 +00001247 // If there's already an address-of operator in the expression, we have
1248 // the right type already, and the code below would just introduce an
1249 // invalid additional pointer level.
Anders Carlsson96ad5332009-10-21 17:16:23 +00001250 if (FromType->isPointerType() || FromType->isMemberFunctionPointerType())
Sebastian Redl759986e2009-10-17 20:50:27 +00001251 break;
Douglas Gregor904eed32008-11-10 20:40:00 +00001252 }
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001253 FromType = Context.getPointerType(FromType);
Anders Carlssonb633c4e2009-09-01 20:37:18 +00001254 ImpCastExprToType(From, FromType, CastExpr::CK_FunctionToPointerDecay);
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001255 break;
1256
1257 default:
1258 assert(false && "Improper first standard conversion");
1259 break;
1260 }
1261
1262 // Perform the second implicit conversion
1263 switch (SCS.Second) {
1264 case ICK_Identity:
Sebastian Redl2c7588f2009-10-10 12:04:10 +00001265 // If both sides are functions (or pointers/references to them), there could
1266 // be incompatible exception declarations.
1267 if (CheckExceptionSpecCompatibility(From, ToType))
1268 return true;
1269 // Nothing else to do.
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001270 break;
1271
Douglas Gregor43c79c22009-12-09 00:47:37 +00001272 case ICK_NoReturn_Adjustment:
1273 // If both sides are functions (or pointers/references to them), there could
1274 // be incompatible exception declarations.
1275 if (CheckExceptionSpecCompatibility(From, ToType))
1276 return true;
1277
1278 ImpCastExprToType(From, Context.getNoReturnType(From->getType(), false),
1279 CastExpr::CK_NoOp);
1280 break;
1281
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001282 case ICK_Integral_Promotion:
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001283 case ICK_Integral_Conversion:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001284 ImpCastExprToType(From, ToType, CastExpr::CK_IntegralCast);
1285 break;
1286
1287 case ICK_Floating_Promotion:
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001288 case ICK_Floating_Conversion:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001289 ImpCastExprToType(From, ToType, CastExpr::CK_FloatingCast);
1290 break;
1291
1292 case ICK_Complex_Promotion:
Douglas Gregor5cdf8212009-02-12 00:15:05 +00001293 case ICK_Complex_Conversion:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001294 ImpCastExprToType(From, ToType, CastExpr::CK_Unknown);
1295 break;
1296
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001297 case ICK_Floating_Integral:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001298 if (ToType->isFloatingType())
1299 ImpCastExprToType(From, ToType, CastExpr::CK_IntegralToFloating);
1300 else
1301 ImpCastExprToType(From, ToType, CastExpr::CK_FloatingToIntegral);
1302 break;
1303
Douglas Gregor5cdf8212009-02-12 00:15:05 +00001304 case ICK_Complex_Real:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001305 ImpCastExprToType(From, ToType, CastExpr::CK_Unknown);
1306 break;
1307
Douglas Gregorf9201e02009-02-11 23:02:49 +00001308 case ICK_Compatible_Conversion:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001309 ImpCastExprToType(From, ToType, CastExpr::CK_NoOp);
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001310 break;
1311
Anders Carlsson61faec12009-09-12 04:46:44 +00001312 case ICK_Pointer_Conversion: {
Douglas Gregor45920e82008-12-19 17:40:08 +00001313 if (SCS.IncompatibleObjC) {
1314 // Diagnose incompatible Objective-C conversions
Mike Stump1eb44332009-09-09 15:08:12 +00001315 Diag(From->getSourceRange().getBegin(),
Douglas Gregor45920e82008-12-19 17:40:08 +00001316 diag::ext_typecheck_convert_incompatible_pointer)
1317 << From->getType() << ToType << Flavor
1318 << From->getSourceRange();
1319 }
1320
Anders Carlsson61faec12009-09-12 04:46:44 +00001321
1322 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
Sebastian Redla82e4ae2009-11-14 21:15:49 +00001323 if (CheckPointerConversion(From, ToType, Kind, IgnoreBaseAccess))
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001324 return true;
Anders Carlsson61faec12009-09-12 04:46:44 +00001325 ImpCastExprToType(From, ToType, Kind);
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001326 break;
Anders Carlsson61faec12009-09-12 04:46:44 +00001327 }
1328
1329 case ICK_Pointer_Member: {
1330 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
Sebastian Redla82e4ae2009-11-14 21:15:49 +00001331 if (CheckMemberPointerConversion(From, ToType, Kind, IgnoreBaseAccess))
Anders Carlsson61faec12009-09-12 04:46:44 +00001332 return true;
Sebastian Redl2c7588f2009-10-10 12:04:10 +00001333 if (CheckExceptionSpecCompatibility(From, ToType))
1334 return true;
Anders Carlsson61faec12009-09-12 04:46:44 +00001335 ImpCastExprToType(From, ToType, Kind);
1336 break;
1337 }
Anders Carlssonbc0e0782009-11-23 20:04:44 +00001338 case ICK_Boolean_Conversion: {
1339 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
1340 if (FromType->isMemberPointerType())
1341 Kind = CastExpr::CK_MemberPointerToBoolean;
1342
1343 ImpCastExprToType(From, Context.BoolTy, Kind);
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001344 break;
Anders Carlssonbc0e0782009-11-23 20:04:44 +00001345 }
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001346
Douglas Gregorb7a86f52009-11-06 01:02:41 +00001347 case ICK_Derived_To_Base:
1348 if (CheckDerivedToBaseConversion(From->getType(),
1349 ToType.getNonReferenceType(),
1350 From->getLocStart(),
Sebastian Redla82e4ae2009-11-14 21:15:49 +00001351 From->getSourceRange(),
1352 IgnoreBaseAccess))
Douglas Gregorb7a86f52009-11-06 01:02:41 +00001353 return true;
1354 ImpCastExprToType(From, ToType.getNonReferenceType(),
1355 CastExpr::CK_DerivedToBase);
1356 break;
1357
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001358 default:
1359 assert(false && "Improper second standard conversion");
1360 break;
1361 }
1362
1363 switch (SCS.Third) {
1364 case ICK_Identity:
1365 // Nothing to do.
1366 break;
1367
1368 case ICK_Qualification:
Mike Stump390b4cc2009-05-16 07:39:55 +00001369 // FIXME: Not sure about lvalue vs rvalue here in the presence of rvalue
1370 // references.
Mike Stump1eb44332009-09-09 15:08:12 +00001371 ImpCastExprToType(From, ToType.getNonReferenceType(),
Eli Friedman73c39ab2009-10-20 08:27:19 +00001372 CastExpr::CK_NoOp,
Sebastian Redl7c80bd62009-03-16 23:22:08 +00001373 ToType->isLValueReferenceType());
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001374 break;
Douglas Gregorb7a86f52009-11-06 01:02:41 +00001375
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001376 default:
1377 assert(false && "Improper second standard conversion");
1378 break;
1379 }
1380
1381 return false;
1382}
1383
Sebastian Redl64b45f72009-01-05 20:52:13 +00001384Sema::OwningExprResult Sema::ActOnUnaryTypeTrait(UnaryTypeTrait OTT,
1385 SourceLocation KWLoc,
1386 SourceLocation LParen,
1387 TypeTy *Ty,
1388 SourceLocation RParen) {
Argyrios Kyrtzidise8661902009-08-19 01:28:28 +00001389 QualType T = GetTypeFromParser(Ty);
Mike Stump1eb44332009-09-09 15:08:12 +00001390
Anders Carlsson3292d5c2009-07-07 19:06:02 +00001391 // According to http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
1392 // all traits except __is_class, __is_enum and __is_union require a the type
1393 // to be complete.
1394 if (OTT != UTT_IsClass && OTT != UTT_IsEnum && OTT != UTT_IsUnion) {
Mike Stump1eb44332009-09-09 15:08:12 +00001395 if (RequireCompleteType(KWLoc, T,
Anders Carlssond497ba72009-08-26 22:59:12 +00001396 diag::err_incomplete_type_used_in_type_trait_expr))
Anders Carlsson3292d5c2009-07-07 19:06:02 +00001397 return ExprError();
1398 }
Sebastian Redl64b45f72009-01-05 20:52:13 +00001399
1400 // There is no point in eagerly computing the value. The traits are designed
1401 // to be used from type trait templates, so Ty will be a template parameter
1402 // 99% of the time.
Anders Carlsson3292d5c2009-07-07 19:06:02 +00001403 return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, OTT, T,
1404 RParen, Context.BoolTy));
Sebastian Redl64b45f72009-01-05 20:52:13 +00001405}
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001406
1407QualType Sema::CheckPointerToMemberOperands(
Mike Stump1eb44332009-09-09 15:08:12 +00001408 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isIndirect) {
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001409 const char *OpSpelling = isIndirect ? "->*" : ".*";
1410 // C++ 5.5p2
1411 // The binary operator .* [p3: ->*] binds its second operand, which shall
1412 // be of type "pointer to member of T" (where T is a completely-defined
1413 // class type) [...]
1414 QualType RType = rex->getType();
Ted Kremenek6217b802009-07-29 21:53:49 +00001415 const MemberPointerType *MemPtr = RType->getAs<MemberPointerType>();
Douglas Gregore7450f52009-03-24 19:52:54 +00001416 if (!MemPtr) {
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001417 Diag(Loc, diag::err_bad_memptr_rhs)
1418 << OpSpelling << RType << rex->getSourceRange();
1419 return QualType();
Mike Stump1eb44332009-09-09 15:08:12 +00001420 }
Douglas Gregore7450f52009-03-24 19:52:54 +00001421
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001422 QualType Class(MemPtr->getClass(), 0);
1423
1424 // C++ 5.5p2
1425 // [...] to its first operand, which shall be of class T or of a class of
1426 // which T is an unambiguous and accessible base class. [p3: a pointer to
1427 // such a class]
1428 QualType LType = lex->getType();
1429 if (isIndirect) {
Ted Kremenek6217b802009-07-29 21:53:49 +00001430 if (const PointerType *Ptr = LType->getAs<PointerType>())
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001431 LType = Ptr->getPointeeType().getNonReferenceType();
1432 else {
1433 Diag(Loc, diag::err_bad_memptr_lhs)
Fariborz Jahanianef78ac62009-10-26 20:45:27 +00001434 << OpSpelling << 1 << LType
1435 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ".*");
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001436 return QualType();
1437 }
1438 }
1439
Douglas Gregora4923eb2009-11-16 21:35:15 +00001440 if (!Context.hasSameUnqualifiedType(Class, LType)) {
Douglas Gregora8f32e02009-10-06 17:59:45 +00001441 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/false,
1442 /*DetectVirtual=*/false);
Mike Stump390b4cc2009-05-16 07:39:55 +00001443 // FIXME: Would it be useful to print full ambiguity paths, or is that
1444 // overkill?
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001445 if (!IsDerivedFrom(LType, Class, Paths) ||
1446 Paths.isAmbiguous(Context.getCanonicalType(Class))) {
Fariborz Jahanianef78ac62009-10-26 20:45:27 +00001447 const char *ReplaceStr = isIndirect ? ".*" : "->*";
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001448 Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling
Fariborz Jahanianef78ac62009-10-26 20:45:27 +00001449 << (int)isIndirect << lex->getType() <<
1450 CodeModificationHint::CreateReplacement(SourceRange(Loc), ReplaceStr);
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001451 return QualType();
1452 }
1453 }
1454
Fariborz Jahanian19d70732009-11-18 22:16:17 +00001455 if (isa<CXXZeroInitValueExpr>(rex->IgnoreParens())) {
Fariborz Jahanian05ebda92009-11-18 21:54:48 +00001456 // Diagnose use of pointer-to-member type which when used as
1457 // the functional cast in a pointer-to-member expression.
1458 Diag(Loc, diag::err_pointer_to_member_type) << isIndirect;
1459 return QualType();
1460 }
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001461 // C++ 5.5p2
1462 // The result is an object or a function of the type specified by the
1463 // second operand.
1464 // The cv qualifiers are the union of those in the pointer and the left side,
1465 // in accordance with 5.5p5 and 5.2.5.
1466 // FIXME: This returns a dereferenced member function pointer as a normal
1467 // function type. However, the only operation valid on such functions is
Mike Stump390b4cc2009-05-16 07:39:55 +00001468 // calling them. There's also a GCC extension to get a function pointer to the
1469 // thing, which is another complication, because this type - unlike the type
1470 // that is the result of this expression - takes the class as the first
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001471 // argument.
1472 // We probably need a "MemberFunctionClosureType" or something like that.
1473 QualType Result = MemPtr->getPointeeType();
John McCall0953e762009-09-24 19:53:00 +00001474 Result = Context.getCVRQualifiedType(Result, LType.getCVRQualifiers());
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001475 return Result;
1476}
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001477
1478/// \brief Get the target type of a standard or user-defined conversion.
1479static QualType TargetType(const ImplicitConversionSequence &ICS) {
1480 assert((ICS.ConversionKind ==
1481 ImplicitConversionSequence::StandardConversion ||
1482 ICS.ConversionKind ==
1483 ImplicitConversionSequence::UserDefinedConversion) &&
1484 "function only valid for standard or user-defined conversions");
1485 if (ICS.ConversionKind == ImplicitConversionSequence::StandardConversion)
1486 return QualType::getFromOpaquePtr(ICS.Standard.ToTypePtr);
1487 return QualType::getFromOpaquePtr(ICS.UserDefined.After.ToTypePtr);
1488}
1489
1490/// \brief Try to convert a type to another according to C++0x 5.16p3.
1491///
1492/// This is part of the parameter validation for the ? operator. If either
1493/// value operand is a class type, the two operands are attempted to be
1494/// converted to each other. This function does the conversion in one direction.
1495/// It emits a diagnostic and returns true only if it finds an ambiguous
1496/// conversion.
1497static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
1498 SourceLocation QuestionLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00001499 ImplicitConversionSequence &ICS) {
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001500 // C++0x 5.16p3
1501 // The process for determining whether an operand expression E1 of type T1
1502 // can be converted to match an operand expression E2 of type T2 is defined
1503 // as follows:
1504 // -- If E2 is an lvalue:
1505 if (To->isLvalue(Self.Context) == Expr::LV_Valid) {
1506 // E1 can be converted to match E2 if E1 can be implicitly converted to
1507 // type "lvalue reference to T2", subject to the constraint that in the
1508 // conversion the reference must bind directly to E1.
1509 if (!Self.CheckReferenceInit(From,
1510 Self.Context.getLValueReferenceType(To->getType()),
Douglas Gregor739d8282009-09-23 23:04:10 +00001511 To->getLocStart(),
Anders Carlsson2de3ace2009-08-27 17:30:43 +00001512 /*SuppressUserConversions=*/false,
1513 /*AllowExplicit=*/false,
1514 /*ForceRValue=*/false,
1515 &ICS))
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001516 {
1517 assert((ICS.ConversionKind ==
1518 ImplicitConversionSequence::StandardConversion ||
1519 ICS.ConversionKind ==
1520 ImplicitConversionSequence::UserDefinedConversion) &&
1521 "expected a definite conversion");
1522 bool DirectBinding =
1523 ICS.ConversionKind == ImplicitConversionSequence::StandardConversion ?
1524 ICS.Standard.DirectBinding : ICS.UserDefined.After.DirectBinding;
1525 if (DirectBinding)
1526 return false;
1527 }
1528 }
1529 ICS.ConversionKind = ImplicitConversionSequence::BadConversion;
1530 // -- If E2 is an rvalue, or if the conversion above cannot be done:
1531 // -- if E1 and E2 have class type, and the underlying class types are
1532 // the same or one is a base class of the other:
1533 QualType FTy = From->getType();
1534 QualType TTy = To->getType();
Ted Kremenek6217b802009-07-29 21:53:49 +00001535 const RecordType *FRec = FTy->getAs<RecordType>();
1536 const RecordType *TRec = TTy->getAs<RecordType>();
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001537 bool FDerivedFromT = FRec && TRec && Self.IsDerivedFrom(FTy, TTy);
1538 if (FRec && TRec && (FRec == TRec ||
1539 FDerivedFromT || Self.IsDerivedFrom(TTy, FTy))) {
1540 // E1 can be converted to match E2 if the class of T2 is the
1541 // same type as, or a base class of, the class of T1, and
1542 // [cv2 > cv1].
1543 if ((FRec == TRec || FDerivedFromT) && TTy.isAtLeastAsQualifiedAs(FTy)) {
1544 // Could still fail if there's no copy constructor.
1545 // FIXME: Is this a hard error then, or just a conversion failure? The
1546 // standard doesn't say.
Mike Stump1eb44332009-09-09 15:08:12 +00001547 ICS = Self.TryCopyInitialization(From, TTy,
Anders Carlssond28b4282009-08-27 17:18:13 +00001548 /*SuppressUserConversions=*/false,
Anders Carlsson7b361b52009-08-27 17:37:39 +00001549 /*ForceRValue=*/false,
1550 /*InOverloadResolution=*/false);
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001551 }
1552 } else {
1553 // -- Otherwise: E1 can be converted to match E2 if E1 can be
1554 // implicitly converted to the type that expression E2 would have
1555 // if E2 were converted to an rvalue.
1556 // First find the decayed type.
1557 if (TTy->isFunctionType())
1558 TTy = Self.Context.getPointerType(TTy);
Mike Stump1eb44332009-09-09 15:08:12 +00001559 else if (TTy->isArrayType())
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001560 TTy = Self.Context.getArrayDecayedType(TTy);
1561
1562 // Now try the implicit conversion.
1563 // FIXME: This doesn't detect ambiguities.
Anders Carlssonda7a18b2009-08-27 17:24:15 +00001564 ICS = Self.TryImplicitConversion(From, TTy,
1565 /*SuppressUserConversions=*/false,
1566 /*AllowExplicit=*/false,
Anders Carlsson08972922009-08-28 15:33:32 +00001567 /*ForceRValue=*/false,
1568 /*InOverloadResolution=*/false);
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001569 }
1570 return false;
1571}
1572
1573/// \brief Try to find a common type for two according to C++0x 5.16p5.
1574///
1575/// This is part of the parameter validation for the ? operator. If either
1576/// value operand is a class type, overload resolution is used to find a
1577/// conversion to a common type.
1578static bool FindConditionalOverload(Sema &Self, Expr *&LHS, Expr *&RHS,
1579 SourceLocation Loc) {
1580 Expr *Args[2] = { LHS, RHS };
1581 OverloadCandidateSet CandidateSet;
Douglas Gregor573d9c32009-10-21 23:19:44 +00001582 Self.AddBuiltinOperatorCandidates(OO_Conditional, Loc, Args, 2, CandidateSet);
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001583
1584 OverloadCandidateSet::iterator Best;
Douglas Gregore0762c92009-06-19 23:52:42 +00001585 switch (Self.BestViableFunction(CandidateSet, Loc, Best)) {
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001586 case Sema::OR_Success:
1587 // We found a match. Perform the conversions on the arguments and move on.
1588 if (Self.PerformImplicitConversion(LHS, Best->BuiltinTypes.ParamTypes[0],
1589 Best->Conversions[0], "converting") ||
1590 Self.PerformImplicitConversion(RHS, Best->BuiltinTypes.ParamTypes[1],
1591 Best->Conversions[1], "converting"))
1592 break;
1593 return false;
1594
1595 case Sema::OR_No_Viable_Function:
1596 Self.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
1597 << LHS->getType() << RHS->getType()
1598 << LHS->getSourceRange() << RHS->getSourceRange();
1599 return true;
1600
1601 case Sema::OR_Ambiguous:
1602 Self.Diag(Loc, diag::err_conditional_ambiguous_ovl)
1603 << LHS->getType() << RHS->getType()
1604 << LHS->getSourceRange() << RHS->getSourceRange();
Mike Stump390b4cc2009-05-16 07:39:55 +00001605 // FIXME: Print the possible common types by printing the return types of
1606 // the viable candidates.
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001607 break;
1608
1609 case Sema::OR_Deleted:
1610 assert(false && "Conditional operator has only built-in overloads");
1611 break;
1612 }
1613 return true;
1614}
1615
Sebastian Redl76458502009-04-17 16:30:52 +00001616/// \brief Perform an "extended" implicit conversion as returned by
1617/// TryClassUnification.
1618///
1619/// TryClassUnification generates ICSs that include reference bindings.
1620/// PerformImplicitConversion is not suitable for this; it chokes if the
1621/// second part of a standard conversion is ICK_DerivedToBase. This function
1622/// handles the reference binding specially.
1623static bool ConvertForConditional(Sema &Self, Expr *&E,
Mike Stump1eb44332009-09-09 15:08:12 +00001624 const ImplicitConversionSequence &ICS) {
Sebastian Redl76458502009-04-17 16:30:52 +00001625 if (ICS.ConversionKind == ImplicitConversionSequence::StandardConversion &&
1626 ICS.Standard.ReferenceBinding) {
1627 assert(ICS.Standard.DirectBinding &&
1628 "TryClassUnification should never generate indirect ref bindings");
Sebastian Redla5cd2cd2009-04-26 11:21:02 +00001629 // FIXME: CheckReferenceInit should be able to reuse the ICS instead of
1630 // redoing all the work.
1631 return Self.CheckReferenceInit(E, Self.Context.getLValueReferenceType(
Anders Carlsson2de3ace2009-08-27 17:30:43 +00001632 TargetType(ICS)),
Douglas Gregor739d8282009-09-23 23:04:10 +00001633 /*FIXME:*/E->getLocStart(),
Anders Carlsson2de3ace2009-08-27 17:30:43 +00001634 /*SuppressUserConversions=*/false,
1635 /*AllowExplicit=*/false,
1636 /*ForceRValue=*/false);
Sebastian Redl76458502009-04-17 16:30:52 +00001637 }
1638 if (ICS.ConversionKind == ImplicitConversionSequence::UserDefinedConversion &&
1639 ICS.UserDefined.After.ReferenceBinding) {
1640 assert(ICS.UserDefined.After.DirectBinding &&
1641 "TryClassUnification should never generate indirect ref bindings");
Sebastian Redla5cd2cd2009-04-26 11:21:02 +00001642 return Self.CheckReferenceInit(E, Self.Context.getLValueReferenceType(
Anders Carlsson2de3ace2009-08-27 17:30:43 +00001643 TargetType(ICS)),
Douglas Gregor739d8282009-09-23 23:04:10 +00001644 /*FIXME:*/E->getLocStart(),
Anders Carlsson2de3ace2009-08-27 17:30:43 +00001645 /*SuppressUserConversions=*/false,
1646 /*AllowExplicit=*/false,
1647 /*ForceRValue=*/false);
Sebastian Redl76458502009-04-17 16:30:52 +00001648 }
1649 if (Self.PerformImplicitConversion(E, TargetType(ICS), ICS, "converting"))
1650 return true;
1651 return false;
1652}
1653
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001654/// \brief Check the operands of ?: under C++ semantics.
1655///
1656/// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y
1657/// extension. In this case, LHS == Cond. (But they're not aliases.)
1658QualType Sema::CXXCheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
1659 SourceLocation QuestionLoc) {
Mike Stump390b4cc2009-05-16 07:39:55 +00001660 // FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++
1661 // interface pointers.
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001662
1663 // C++0x 5.16p1
1664 // The first expression is contextually converted to bool.
1665 if (!Cond->isTypeDependent()) {
1666 if (CheckCXXBooleanCondition(Cond))
1667 return QualType();
1668 }
1669
1670 // Either of the arguments dependent?
1671 if (LHS->isTypeDependent() || RHS->isTypeDependent())
1672 return Context.DependentTy;
1673
John McCallb13c87f2009-11-05 09:23:39 +00001674 CheckSignCompare(LHS, RHS, QuestionLoc, diag::warn_mixed_sign_conditional);
1675
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001676 // C++0x 5.16p2
1677 // If either the second or the third operand has type (cv) void, ...
1678 QualType LTy = LHS->getType();
1679 QualType RTy = RHS->getType();
1680 bool LVoid = LTy->isVoidType();
1681 bool RVoid = RTy->isVoidType();
1682 if (LVoid || RVoid) {
1683 // ... then the [l2r] conversions are performed on the second and third
1684 // operands ...
1685 DefaultFunctionArrayConversion(LHS);
1686 DefaultFunctionArrayConversion(RHS);
1687 LTy = LHS->getType();
1688 RTy = RHS->getType();
1689
1690 // ... and one of the following shall hold:
1691 // -- The second or the third operand (but not both) is a throw-
1692 // expression; the result is of the type of the other and is an rvalue.
1693 bool LThrow = isa<CXXThrowExpr>(LHS);
1694 bool RThrow = isa<CXXThrowExpr>(RHS);
1695 if (LThrow && !RThrow)
1696 return RTy;
1697 if (RThrow && !LThrow)
1698 return LTy;
1699
1700 // -- Both the second and third operands have type void; the result is of
1701 // type void and is an rvalue.
1702 if (LVoid && RVoid)
1703 return Context.VoidTy;
1704
1705 // Neither holds, error.
1706 Diag(QuestionLoc, diag::err_conditional_void_nonvoid)
1707 << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1)
1708 << LHS->getSourceRange() << RHS->getSourceRange();
1709 return QualType();
1710 }
1711
1712 // Neither is void.
1713
1714 // C++0x 5.16p3
1715 // Otherwise, if the second and third operand have different types, and
1716 // either has (cv) class type, and attempt is made to convert each of those
1717 // operands to the other.
1718 if (Context.getCanonicalType(LTy) != Context.getCanonicalType(RTy) &&
1719 (LTy->isRecordType() || RTy->isRecordType())) {
1720 ImplicitConversionSequence ICSLeftToRight, ICSRightToLeft;
1721 // These return true if a single direction is already ambiguous.
1722 if (TryClassUnification(*this, LHS, RHS, QuestionLoc, ICSLeftToRight))
1723 return QualType();
1724 if (TryClassUnification(*this, RHS, LHS, QuestionLoc, ICSRightToLeft))
1725 return QualType();
1726
1727 bool HaveL2R = ICSLeftToRight.ConversionKind !=
1728 ImplicitConversionSequence::BadConversion;
1729 bool HaveR2L = ICSRightToLeft.ConversionKind !=
1730 ImplicitConversionSequence::BadConversion;
1731 // If both can be converted, [...] the program is ill-formed.
1732 if (HaveL2R && HaveR2L) {
1733 Diag(QuestionLoc, diag::err_conditional_ambiguous)
1734 << LTy << RTy << LHS->getSourceRange() << RHS->getSourceRange();
1735 return QualType();
1736 }
1737
1738 // If exactly one conversion is possible, that conversion is applied to
1739 // the chosen operand and the converted operands are used in place of the
1740 // original operands for the remainder of this section.
1741 if (HaveL2R) {
Sebastian Redl76458502009-04-17 16:30:52 +00001742 if (ConvertForConditional(*this, LHS, ICSLeftToRight))
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001743 return QualType();
1744 LTy = LHS->getType();
1745 } else if (HaveR2L) {
Sebastian Redl76458502009-04-17 16:30:52 +00001746 if (ConvertForConditional(*this, RHS, ICSRightToLeft))
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001747 return QualType();
1748 RTy = RHS->getType();
1749 }
1750 }
1751
1752 // C++0x 5.16p4
1753 // If the second and third operands are lvalues and have the same type,
1754 // the result is of that type [...]
1755 bool Same = Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy);
1756 if (Same && LHS->isLvalue(Context) == Expr::LV_Valid &&
1757 RHS->isLvalue(Context) == Expr::LV_Valid)
1758 return LTy;
1759
1760 // C++0x 5.16p5
1761 // Otherwise, the result is an rvalue. If the second and third operands
1762 // do not have the same type, and either has (cv) class type, ...
1763 if (!Same && (LTy->isRecordType() || RTy->isRecordType())) {
1764 // ... overload resolution is used to determine the conversions (if any)
1765 // to be applied to the operands. If the overload resolution fails, the
1766 // program is ill-formed.
1767 if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc))
1768 return QualType();
1769 }
1770
1771 // C++0x 5.16p6
1772 // LValue-to-rvalue, array-to-pointer, and function-to-pointer standard
1773 // conversions are performed on the second and third operands.
1774 DefaultFunctionArrayConversion(LHS);
1775 DefaultFunctionArrayConversion(RHS);
1776 LTy = LHS->getType();
1777 RTy = RHS->getType();
1778
1779 // After those conversions, one of the following shall hold:
1780 // -- The second and third operands have the same type; the result
1781 // is of that type.
1782 if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy))
1783 return LTy;
1784
1785 // -- The second and third operands have arithmetic or enumeration type;
1786 // the usual arithmetic conversions are performed to bring them to a
1787 // common type, and the result is of that type.
1788 if (LTy->isArithmeticType() && RTy->isArithmeticType()) {
1789 UsualArithmeticConversions(LHS, RHS);
1790 return LHS->getType();
1791 }
1792
1793 // -- The second and third operands have pointer type, or one has pointer
1794 // type and the other is a null pointer constant; pointer conversions
1795 // and qualification conversions are performed to bring them to their
1796 // composite pointer type. The result is of the composite pointer type.
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001797 QualType Composite = FindCompositePointerType(LHS, RHS);
1798 if (!Composite.isNull())
1799 return Composite;
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001800
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001801 // Fourth bullet is same for pointers-to-member. However, the possible
1802 // conversions are far more limited: we have null-to-pointer, upcast of
1803 // containing class, and second-level cv-ness.
1804 // cv-ness is not a union, but must match one of the two operands. (Which,
1805 // frankly, is stupid.)
Ted Kremenek6217b802009-07-29 21:53:49 +00001806 const MemberPointerType *LMemPtr = LTy->getAs<MemberPointerType>();
1807 const MemberPointerType *RMemPtr = RTy->getAs<MemberPointerType>();
Douglas Gregorce940492009-09-25 04:25:58 +00001808 if (LMemPtr &&
1809 RHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00001810 ImpCastExprToType(RHS, LTy, CastExpr::CK_NullToMemberPointer);
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001811 return LTy;
1812 }
Douglas Gregorce940492009-09-25 04:25:58 +00001813 if (RMemPtr &&
1814 LHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00001815 ImpCastExprToType(LHS, RTy, CastExpr::CK_NullToMemberPointer);
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001816 return RTy;
1817 }
1818 if (LMemPtr && RMemPtr) {
1819 QualType LPointee = LMemPtr->getPointeeType();
1820 QualType RPointee = RMemPtr->getPointeeType();
John McCall0953e762009-09-24 19:53:00 +00001821
1822 QualifierCollector LPQuals, RPQuals;
1823 const Type *LPCan = LPQuals.strip(Context.getCanonicalType(LPointee));
1824 const Type *RPCan = RPQuals.strip(Context.getCanonicalType(RPointee));
1825
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001826 // First, we check that the unqualified pointee type is the same. If it's
1827 // not, there's no conversion that will unify the two pointers.
John McCall0953e762009-09-24 19:53:00 +00001828 if (LPCan == RPCan) {
1829
1830 // Second, we take the greater of the two qualifications. If neither
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001831 // is greater than the other, the conversion is not possible.
John McCall0953e762009-09-24 19:53:00 +00001832
1833 Qualifiers MergedQuals = LPQuals + RPQuals;
1834
1835 bool CompatibleQuals = true;
1836 if (MergedQuals.getCVRQualifiers() != LPQuals.getCVRQualifiers() &&
1837 MergedQuals.getCVRQualifiers() != RPQuals.getCVRQualifiers())
1838 CompatibleQuals = false;
1839 else if (LPQuals.getAddressSpace() != RPQuals.getAddressSpace())
1840 // FIXME:
1841 // C99 6.5.15 as modified by TR 18037:
1842 // If the second and third operands are pointers into different
1843 // address spaces, the address spaces must overlap.
1844 CompatibleQuals = false;
1845 // FIXME: GC qualifiers?
1846
1847 if (CompatibleQuals) {
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001848 // Third, we check if either of the container classes is derived from
1849 // the other.
1850 QualType LContainer(LMemPtr->getClass(), 0);
1851 QualType RContainer(RMemPtr->getClass(), 0);
1852 QualType MoreDerived;
1853 if (Context.getCanonicalType(LContainer) ==
1854 Context.getCanonicalType(RContainer))
1855 MoreDerived = LContainer;
1856 else if (IsDerivedFrom(LContainer, RContainer))
1857 MoreDerived = LContainer;
1858 else if (IsDerivedFrom(RContainer, LContainer))
1859 MoreDerived = RContainer;
1860
1861 if (!MoreDerived.isNull()) {
1862 // The type 'Q Pointee (MoreDerived::*)' is the common type.
1863 // We don't use ImpCastExprToType here because this could still fail
1864 // for ambiguous or inaccessible conversions.
John McCall0953e762009-09-24 19:53:00 +00001865 LPointee = Context.getQualifiedType(LPointee, MergedQuals);
1866 QualType Common
1867 = Context.getMemberPointerType(LPointee, MoreDerived.getTypePtr());
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001868 if (PerformImplicitConversion(LHS, Common, "converting"))
1869 return QualType();
1870 if (PerformImplicitConversion(RHS, Common, "converting"))
1871 return QualType();
1872 return Common;
1873 }
1874 }
1875 }
1876 }
1877
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001878 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
1879 << LHS->getType() << RHS->getType()
1880 << LHS->getSourceRange() << RHS->getSourceRange();
1881 return QualType();
1882}
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001883
1884/// \brief Find a merged pointer type and convert the two expressions to it.
1885///
Douglas Gregor20b3e992009-08-24 17:42:35 +00001886/// This finds the composite pointer type (or member pointer type) for @p E1
1887/// and @p E2 according to C++0x 5.9p2. It converts both expressions to this
1888/// type and returns it.
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001889/// It does not emit diagnostics.
1890QualType Sema::FindCompositePointerType(Expr *&E1, Expr *&E2) {
1891 assert(getLangOptions().CPlusPlus && "This function assumes C++");
1892 QualType T1 = E1->getType(), T2 = E2->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00001893
Fariborz Jahanian0cedfbd2009-12-08 20:04:24 +00001894 if (!T1->isAnyPointerType() && !T1->isMemberPointerType() &&
1895 !T2->isAnyPointerType() && !T2->isMemberPointerType())
Douglas Gregor20b3e992009-08-24 17:42:35 +00001896 return QualType();
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001897
1898 // C++0x 5.9p2
1899 // Pointer conversions and qualification conversions are performed on
1900 // pointer operands to bring them to their composite pointer type. If
1901 // one operand is a null pointer constant, the composite pointer type is
1902 // the type of the other operand.
Douglas Gregorce940492009-09-25 04:25:58 +00001903 if (E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00001904 if (T2->isMemberPointerType())
1905 ImpCastExprToType(E1, T2, CastExpr::CK_NullToMemberPointer);
1906 else
1907 ImpCastExprToType(E1, T2, CastExpr::CK_IntegralToPointer);
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001908 return T2;
1909 }
Douglas Gregorce940492009-09-25 04:25:58 +00001910 if (E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00001911 if (T1->isMemberPointerType())
1912 ImpCastExprToType(E2, T1, CastExpr::CK_NullToMemberPointer);
1913 else
1914 ImpCastExprToType(E2, T1, CastExpr::CK_IntegralToPointer);
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001915 return T1;
1916 }
Mike Stump1eb44332009-09-09 15:08:12 +00001917
Douglas Gregor20b3e992009-08-24 17:42:35 +00001918 // Now both have to be pointers or member pointers.
Sebastian Redla439e6f2009-11-16 21:03:45 +00001919 if ((!T1->isPointerType() && !T1->isMemberPointerType()) ||
1920 (!T2->isPointerType() && !T2->isMemberPointerType()))
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001921 return QualType();
1922
1923 // Otherwise, of one of the operands has type "pointer to cv1 void," then
1924 // the other has type "pointer to cv2 T" and the composite pointer type is
1925 // "pointer to cv12 void," where cv12 is the union of cv1 and cv2.
1926 // Otherwise, the composite pointer type is a pointer type similar to the
1927 // type of one of the operands, with a cv-qualification signature that is
1928 // the union of the cv-qualification signatures of the operand types.
1929 // In practice, the first part here is redundant; it's subsumed by the second.
1930 // What we do here is, we build the two possible composite types, and try the
1931 // conversions in both directions. If only one works, or if the two composite
1932 // types are the same, we have succeeded.
John McCall0953e762009-09-24 19:53:00 +00001933 // FIXME: extended qualifiers?
Sebastian Redla439e6f2009-11-16 21:03:45 +00001934 typedef llvm::SmallVector<unsigned, 4> QualifierVector;
1935 QualifierVector QualifierUnion;
1936 typedef llvm::SmallVector<std::pair<const Type *, const Type *>, 4>
1937 ContainingClassVector;
1938 ContainingClassVector MemberOfClass;
1939 QualType Composite1 = Context.getCanonicalType(T1),
1940 Composite2 = Context.getCanonicalType(T2);
Douglas Gregor20b3e992009-08-24 17:42:35 +00001941 do {
1942 const PointerType *Ptr1, *Ptr2;
1943 if ((Ptr1 = Composite1->getAs<PointerType>()) &&
1944 (Ptr2 = Composite2->getAs<PointerType>())) {
1945 Composite1 = Ptr1->getPointeeType();
1946 Composite2 = Ptr2->getPointeeType();
1947 QualifierUnion.push_back(
1948 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
1949 MemberOfClass.push_back(std::make_pair((const Type *)0, (const Type *)0));
1950 continue;
1951 }
Mike Stump1eb44332009-09-09 15:08:12 +00001952
Douglas Gregor20b3e992009-08-24 17:42:35 +00001953 const MemberPointerType *MemPtr1, *MemPtr2;
1954 if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) &&
1955 (MemPtr2 = Composite2->getAs<MemberPointerType>())) {
1956 Composite1 = MemPtr1->getPointeeType();
1957 Composite2 = MemPtr2->getPointeeType();
1958 QualifierUnion.push_back(
1959 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
1960 MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(),
1961 MemPtr2->getClass()));
1962 continue;
1963 }
Mike Stump1eb44332009-09-09 15:08:12 +00001964
Douglas Gregor20b3e992009-08-24 17:42:35 +00001965 // FIXME: block pointer types?
Mike Stump1eb44332009-09-09 15:08:12 +00001966
Douglas Gregor20b3e992009-08-24 17:42:35 +00001967 // Cannot unwrap any more types.
1968 break;
1969 } while (true);
Mike Stump1eb44332009-09-09 15:08:12 +00001970
Douglas Gregor20b3e992009-08-24 17:42:35 +00001971 // Rewrap the composites as pointers or member pointers with the union CVRs.
Sebastian Redla439e6f2009-11-16 21:03:45 +00001972 ContainingClassVector::reverse_iterator MOC
1973 = MemberOfClass.rbegin();
1974 for (QualifierVector::reverse_iterator
1975 I = QualifierUnion.rbegin(),
1976 E = QualifierUnion.rend();
Douglas Gregor20b3e992009-08-24 17:42:35 +00001977 I != E; (void)++I, ++MOC) {
John McCall0953e762009-09-24 19:53:00 +00001978 Qualifiers Quals = Qualifiers::fromCVRMask(*I);
Douglas Gregor20b3e992009-08-24 17:42:35 +00001979 if (MOC->first && MOC->second) {
1980 // Rebuild member pointer type
John McCall0953e762009-09-24 19:53:00 +00001981 Composite1 = Context.getMemberPointerType(
1982 Context.getQualifiedType(Composite1, Quals),
1983 MOC->first);
1984 Composite2 = Context.getMemberPointerType(
1985 Context.getQualifiedType(Composite2, Quals),
1986 MOC->second);
Douglas Gregor20b3e992009-08-24 17:42:35 +00001987 } else {
1988 // Rebuild pointer type
John McCall0953e762009-09-24 19:53:00 +00001989 Composite1
1990 = Context.getPointerType(Context.getQualifiedType(Composite1, Quals));
1991 Composite2
1992 = Context.getPointerType(Context.getQualifiedType(Composite2, Quals));
Douglas Gregor20b3e992009-08-24 17:42:35 +00001993 }
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001994 }
1995
Mike Stump1eb44332009-09-09 15:08:12 +00001996 ImplicitConversionSequence E1ToC1 =
Anders Carlssonda7a18b2009-08-27 17:24:15 +00001997 TryImplicitConversion(E1, Composite1,
1998 /*SuppressUserConversions=*/false,
1999 /*AllowExplicit=*/false,
Anders Carlsson08972922009-08-28 15:33:32 +00002000 /*ForceRValue=*/false,
2001 /*InOverloadResolution=*/false);
Mike Stump1eb44332009-09-09 15:08:12 +00002002 ImplicitConversionSequence E2ToC1 =
Anders Carlssonda7a18b2009-08-27 17:24:15 +00002003 TryImplicitConversion(E2, Composite1,
2004 /*SuppressUserConversions=*/false,
2005 /*AllowExplicit=*/false,
Anders Carlsson08972922009-08-28 15:33:32 +00002006 /*ForceRValue=*/false,
2007 /*InOverloadResolution=*/false);
Mike Stump1eb44332009-09-09 15:08:12 +00002008
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00002009 ImplicitConversionSequence E1ToC2, E2ToC2;
2010 E1ToC2.ConversionKind = ImplicitConversionSequence::BadConversion;
2011 E2ToC2.ConversionKind = ImplicitConversionSequence::BadConversion;
2012 if (Context.getCanonicalType(Composite1) !=
2013 Context.getCanonicalType(Composite2)) {
Anders Carlssonda7a18b2009-08-27 17:24:15 +00002014 E1ToC2 = TryImplicitConversion(E1, Composite2,
2015 /*SuppressUserConversions=*/false,
2016 /*AllowExplicit=*/false,
Anders Carlsson08972922009-08-28 15:33:32 +00002017 /*ForceRValue=*/false,
2018 /*InOverloadResolution=*/false);
Anders Carlssonda7a18b2009-08-27 17:24:15 +00002019 E2ToC2 = TryImplicitConversion(E2, Composite2,
2020 /*SuppressUserConversions=*/false,
2021 /*AllowExplicit=*/false,
Anders Carlsson08972922009-08-28 15:33:32 +00002022 /*ForceRValue=*/false,
2023 /*InOverloadResolution=*/false);
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00002024 }
2025
2026 bool ToC1Viable = E1ToC1.ConversionKind !=
2027 ImplicitConversionSequence::BadConversion
2028 && E2ToC1.ConversionKind !=
2029 ImplicitConversionSequence::BadConversion;
2030 bool ToC2Viable = E1ToC2.ConversionKind !=
2031 ImplicitConversionSequence::BadConversion
2032 && E2ToC2.ConversionKind !=
2033 ImplicitConversionSequence::BadConversion;
2034 if (ToC1Viable && !ToC2Viable) {
2035 if (!PerformImplicitConversion(E1, Composite1, E1ToC1, "converting") &&
2036 !PerformImplicitConversion(E2, Composite1, E2ToC1, "converting"))
2037 return Composite1;
2038 }
2039 if (ToC2Viable && !ToC1Viable) {
2040 if (!PerformImplicitConversion(E1, Composite2, E1ToC2, "converting") &&
2041 !PerformImplicitConversion(E2, Composite2, E2ToC2, "converting"))
2042 return Composite2;
2043 }
2044 return QualType();
2045}
Anders Carlsson165a0a02009-05-17 18:41:29 +00002046
Anders Carlssondef11992009-05-30 20:36:53 +00002047Sema::OwningExprResult Sema::MaybeBindToTemporary(Expr *E) {
Anders Carlsson089c2602009-08-15 23:41:35 +00002048 if (!Context.getLangOptions().CPlusPlus)
2049 return Owned(E);
Mike Stump1eb44332009-09-09 15:08:12 +00002050
Ted Kremenek6217b802009-07-29 21:53:49 +00002051 const RecordType *RT = E->getType()->getAs<RecordType>();
Anders Carlssondef11992009-05-30 20:36:53 +00002052 if (!RT)
2053 return Owned(E);
Mike Stump1eb44332009-09-09 15:08:12 +00002054
Anders Carlssondef11992009-05-30 20:36:53 +00002055 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
2056 if (RD->hasTrivialDestructor())
2057 return Owned(E);
Mike Stump1eb44332009-09-09 15:08:12 +00002058
Anders Carlsson283e4d52009-09-14 01:30:44 +00002059 if (CallExpr *CE = dyn_cast<CallExpr>(E)) {
2060 QualType Ty = CE->getCallee()->getType();
2061 if (const PointerType *PT = Ty->getAs<PointerType>())
2062 Ty = PT->getPointeeType();
2063
John McCall183700f2009-09-21 23:43:11 +00002064 const FunctionType *FTy = Ty->getAs<FunctionType>();
Anders Carlsson283e4d52009-09-14 01:30:44 +00002065 if (FTy->getResultType()->isReferenceType())
2066 return Owned(E);
2067 }
Mike Stump1eb44332009-09-09 15:08:12 +00002068 CXXTemporary *Temp = CXXTemporary::Create(Context,
Anders Carlssondef11992009-05-30 20:36:53 +00002069 RD->getDestructor(Context));
Anders Carlsson860306e2009-05-30 21:21:49 +00002070 ExprTemporaries.push_back(Temp);
Fariborz Jahaniana83f7ed2009-08-03 19:13:25 +00002071 if (CXXDestructorDecl *Destructor =
2072 const_cast<CXXDestructorDecl*>(RD->getDestructor(Context)))
2073 MarkDeclarationReferenced(E->getExprLoc(), Destructor);
Anders Carlssondef11992009-05-30 20:36:53 +00002074 // FIXME: Add the temporary to the temporaries vector.
2075 return Owned(CXXBindTemporaryExpr::Create(Context, Temp, E));
2076}
2077
Mike Stump1eb44332009-09-09 15:08:12 +00002078Expr *Sema::MaybeCreateCXXExprWithTemporaries(Expr *SubExpr,
Anders Carlssonf54741e2009-06-16 03:37:31 +00002079 bool ShouldDestroyTemps) {
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002080 assert(SubExpr && "sub expression can't be null!");
Mike Stump1eb44332009-09-09 15:08:12 +00002081
Douglas Gregor1f5f3a42009-12-03 17:10:37 +00002082 unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries;
2083 assert(ExprTemporaries.size() >= FirstTemporary);
2084 if (ExprTemporaries.size() == FirstTemporary)
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002085 return SubExpr;
Mike Stump1eb44332009-09-09 15:08:12 +00002086
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002087 Expr *E = CXXExprWithTemporaries::Create(Context, SubExpr,
Douglas Gregor1f5f3a42009-12-03 17:10:37 +00002088 &ExprTemporaries[FirstTemporary],
2089 ExprTemporaries.size() - FirstTemporary,
Anders Carlssonf54741e2009-06-16 03:37:31 +00002090 ShouldDestroyTemps);
Douglas Gregor1f5f3a42009-12-03 17:10:37 +00002091 ExprTemporaries.erase(ExprTemporaries.begin() + FirstTemporary,
2092 ExprTemporaries.end());
Mike Stump1eb44332009-09-09 15:08:12 +00002093
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002094 return E;
2095}
2096
Mike Stump1eb44332009-09-09 15:08:12 +00002097Sema::OwningExprResult
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002098Sema::ActOnStartCXXMemberReference(Scope *S, ExprArg Base, SourceLocation OpLoc,
2099 tok::TokenKind OpKind, TypeTy *&ObjectType) {
2100 // Since this might be a postfix expression, get rid of ParenListExprs.
2101 Base = MaybeConvertParenListExprToParenExpr(S, move(Base));
Mike Stump1eb44332009-09-09 15:08:12 +00002102
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002103 Expr *BaseExpr = (Expr*)Base.get();
2104 assert(BaseExpr && "no record expansion");
Mike Stump1eb44332009-09-09 15:08:12 +00002105
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002106 QualType BaseType = BaseExpr->getType();
2107 if (BaseType->isDependentType()) {
Douglas Gregor43d88632009-11-04 22:49:18 +00002108 // If we have a pointer to a dependent type and are using the -> operator,
2109 // the object type is the type that the pointer points to. We might still
2110 // have enough information about that type to do something useful.
2111 if (OpKind == tok::arrow)
2112 if (const PointerType *Ptr = BaseType->getAs<PointerType>())
2113 BaseType = Ptr->getPointeeType();
2114
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002115 ObjectType = BaseType.getAsOpaquePtr();
2116 return move(Base);
2117 }
Mike Stump1eb44332009-09-09 15:08:12 +00002118
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002119 // C++ [over.match.oper]p8:
Mike Stump1eb44332009-09-09 15:08:12 +00002120 // [...] When operator->returns, the operator-> is applied to the value
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002121 // returned, with the original second operand.
2122 if (OpKind == tok::arrow) {
John McCallc4e83212009-09-30 01:01:30 +00002123 // The set of types we've considered so far.
John McCall432887f2009-09-30 01:30:54 +00002124 llvm::SmallPtrSet<CanQualType,8> CTypes;
Fariborz Jahanian7a8233a2009-09-30 17:46:20 +00002125 llvm::SmallVector<SourceLocation, 8> Locations;
John McCall432887f2009-09-30 01:30:54 +00002126 CTypes.insert(Context.getCanonicalType(BaseType));
John McCallc4e83212009-09-30 01:01:30 +00002127
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002128 while (BaseType->isRecordType()) {
Anders Carlsson15ea3782009-10-13 22:43:21 +00002129 Base = BuildOverloadedArrowExpr(S, move(Base), OpLoc);
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002130 BaseExpr = (Expr*)Base.get();
2131 if (BaseExpr == NULL)
2132 return ExprError();
Fariborz Jahanian7a8233a2009-09-30 17:46:20 +00002133 if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(BaseExpr))
Anders Carlssonde699e52009-10-13 22:55:59 +00002134 Locations.push_back(OpCall->getDirectCallee()->getLocation());
John McCallc4e83212009-09-30 01:01:30 +00002135 BaseType = BaseExpr->getType();
2136 CanQualType CBaseType = Context.getCanonicalType(BaseType);
John McCall432887f2009-09-30 01:30:54 +00002137 if (!CTypes.insert(CBaseType)) {
Fariborz Jahanian4a4e3452009-09-30 00:19:41 +00002138 Diag(OpLoc, diag::err_operator_arrow_circular);
Fariborz Jahanian7a8233a2009-09-30 17:46:20 +00002139 for (unsigned i = 0; i < Locations.size(); i++)
2140 Diag(Locations[i], diag::note_declared_at);
Fariborz Jahanian4a4e3452009-09-30 00:19:41 +00002141 return ExprError();
2142 }
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002143 }
Mike Stump1eb44332009-09-09 15:08:12 +00002144
Douglas Gregor31658df2009-11-20 19:58:21 +00002145 if (BaseType->isPointerType())
2146 BaseType = BaseType->getPointeeType();
2147 }
Mike Stump1eb44332009-09-09 15:08:12 +00002148
2149 // We could end up with various non-record types here, such as extended
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002150 // vector types or Objective-C interfaces. Just return early and let
2151 // ActOnMemberReferenceExpr do the work.
Douglas Gregorc68afe22009-09-03 21:38:09 +00002152 if (!BaseType->isRecordType()) {
2153 // C++ [basic.lookup.classref]p2:
2154 // [...] If the type of the object expression is of pointer to scalar
2155 // type, the unqualified-id is looked up in the context of the complete
2156 // postfix-expression.
2157 ObjectType = 0;
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002158 return move(Base);
Douglas Gregorc68afe22009-09-03 21:38:09 +00002159 }
Mike Stump1eb44332009-09-09 15:08:12 +00002160
Douglas Gregor03c57052009-11-17 05:17:33 +00002161 // The object type must be complete (or dependent).
2162 if (!BaseType->isDependentType() &&
2163 RequireCompleteType(OpLoc, BaseType,
2164 PDiag(diag::err_incomplete_member_access)))
2165 return ExprError();
2166
Douglas Gregorc68afe22009-09-03 21:38:09 +00002167 // C++ [basic.lookup.classref]p2:
Mike Stump1eb44332009-09-09 15:08:12 +00002168 // If the id-expression in a class member access (5.2.5) is an
Douglas Gregor03c57052009-11-17 05:17:33 +00002169 // unqualified-id, and the type of the object expression is of a class
Douglas Gregorc68afe22009-09-03 21:38:09 +00002170 // type C (or of pointer to a class type C), the unqualified-id is looked
2171 // up in the scope of class C. [...]
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002172 ObjectType = BaseType.getAsOpaquePtr();
Douglas Gregor03c57052009-11-17 05:17:33 +00002173
Mike Stump1eb44332009-09-09 15:08:12 +00002174 return move(Base);
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002175}
2176
Fariborz Jahanianb7400232009-09-28 23:23:40 +00002177CXXMemberCallExpr *Sema::BuildCXXMemberCallExpr(Expr *Exp,
2178 CXXMethodDecl *Method) {
2179 MemberExpr *ME =
2180 new (Context) MemberExpr(Exp, /*IsArrow=*/false, Method,
2181 SourceLocation(), Method->getType());
2182 QualType ResultType;
2183 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(Method))
2184 ResultType = Conv->getConversionType().getNonReferenceType();
2185 else
2186 ResultType = Method->getResultType().getNonReferenceType();
2187
Douglas Gregor7edfb692009-11-23 12:27:39 +00002188 MarkDeclarationReferenced(Exp->getLocStart(), Method);
2189 CXXMemberCallExpr *CE =
2190 new (Context) CXXMemberCallExpr(Context, ME, 0, 0, ResultType,
2191 Exp->getLocEnd());
Fariborz Jahanianb7400232009-09-28 23:23:40 +00002192 return CE;
2193}
2194
Anders Carlsson0aebc812009-09-09 21:33:21 +00002195Sema::OwningExprResult Sema::BuildCXXCastArgument(SourceLocation CastLoc,
2196 QualType Ty,
2197 CastExpr::CastKind Kind,
2198 CXXMethodDecl *Method,
2199 ExprArg Arg) {
2200 Expr *From = Arg.takeAs<Expr>();
2201
2202 switch (Kind) {
2203 default: assert(0 && "Unhandled cast kind!");
2204 case CastExpr::CK_ConstructorConversion: {
Douglas Gregor39da0b82009-09-09 23:08:42 +00002205 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
2206
2207 if (CompleteConstructorCall(cast<CXXConstructorDecl>(Method),
2208 MultiExprArg(*this, (void **)&From, 1),
2209 CastLoc, ConstructorArgs))
2210 return ExprError();
Anders Carlsson4fa26842009-10-18 21:20:14 +00002211
2212 OwningExprResult Result =
2213 BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method),
2214 move_arg(ConstructorArgs));
2215 if (Result.isInvalid())
2216 return ExprError();
2217
2218 return MaybeBindToTemporary(Result.takeAs<Expr>());
Anders Carlsson0aebc812009-09-09 21:33:21 +00002219 }
2220
2221 case CastExpr::CK_UserDefinedConversion: {
Anders Carlssonaac6e3a2009-09-15 07:42:44 +00002222 assert(!From->getType()->isPointerType() && "Arg can't have pointer type!");
2223
2224 // Cast to base if needed.
2225 if (PerformObjectArgumentInitialization(From, Method))
2226 return ExprError();
2227
Fariborz Jahanianb7400232009-09-28 23:23:40 +00002228 // Create an implicit call expr that calls it.
2229 CXXMemberCallExpr *CE = BuildCXXMemberCallExpr(From, Method);
Anders Carlsson4fa26842009-10-18 21:20:14 +00002230 return MaybeBindToTemporary(CE);
Anders Carlsson0aebc812009-09-09 21:33:21 +00002231 }
Anders Carlsson0aebc812009-09-09 21:33:21 +00002232 }
2233}
2234
Anders Carlsson165a0a02009-05-17 18:41:29 +00002235Sema::OwningExprResult Sema::ActOnFinishFullExpr(ExprArg Arg) {
2236 Expr *FullExpr = Arg.takeAs<Expr>();
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002237 if (FullExpr)
Mike Stump1eb44332009-09-09 15:08:12 +00002238 FullExpr = MaybeCreateCXXExprWithTemporaries(FullExpr,
Anders Carlssonf54741e2009-06-16 03:37:31 +00002239 /*ShouldDestroyTemps=*/true);
Anders Carlsson165a0a02009-05-17 18:41:29 +00002240
Anders Carlssonec773872009-08-25 23:46:41 +00002241
Anders Carlsson165a0a02009-05-17 18:41:29 +00002242 return Owned(FullExpr);
2243}
Douglas Gregore961afb2009-10-22 07:08:30 +00002244
2245/// \brief Determine whether a reference to the given declaration in the
2246/// current context is an implicit member access
2247/// (C++ [class.mfct.non-static]p2).
2248///
2249/// FIXME: Should Objective-C also use this approach?
2250///
Douglas Gregore961afb2009-10-22 07:08:30 +00002251/// \param D the declaration being referenced from the current scope.
2252///
2253/// \param NameLoc the location of the name in the source.
2254///
2255/// \param ThisType if the reference to this declaration is an implicit member
2256/// access, will be set to the type of the "this" pointer to be used when
2257/// building that implicit member access.
2258///
Douglas Gregore961afb2009-10-22 07:08:30 +00002259/// \returns true if this is an implicit member reference (in which case
2260/// \p ThisType and \p MemberType will be set), or false if it is not an
2261/// implicit member reference.
John McCall129e2df2009-11-30 22:42:35 +00002262bool Sema::isImplicitMemberReference(const LookupResult &R,
2263 QualType &ThisType) {
Douglas Gregore961afb2009-10-22 07:08:30 +00002264 // If this isn't a C++ method, then it isn't an implicit member reference.
2265 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext);
2266 if (!MD || MD->isStatic())
2267 return false;
2268
2269 // C++ [class.mfct.nonstatic]p2:
2270 // [...] if name lookup (3.4.1) resolves the name in the
2271 // id-expression to a nonstatic nontype member of class X or of
2272 // a base class of X, the id-expression is transformed into a
2273 // class member access expression (5.2.5) using (*this) (9.3.2)
2274 // as the postfix-expression to the left of the '.' operator.
2275 DeclContext *Ctx = 0;
John McCall129e2df2009-11-30 22:42:35 +00002276 if (R.isUnresolvableResult()) {
2277 // FIXME: this is just picking one at random
2278 Ctx = R.getRepresentativeDecl()->getDeclContext();
2279 } else if (FieldDecl *FD = R.getAsSingle<FieldDecl>()) {
Douglas Gregore961afb2009-10-22 07:08:30 +00002280 Ctx = FD->getDeclContext();
Douglas Gregore961afb2009-10-22 07:08:30 +00002281 } else {
John McCall129e2df2009-11-30 22:42:35 +00002282 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) {
2283 CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(*I);
Douglas Gregore961afb2009-10-22 07:08:30 +00002284 FunctionTemplateDecl *FunTmpl = 0;
John McCall129e2df2009-11-30 22:42:35 +00002285 if (!Method && (FunTmpl = dyn_cast<FunctionTemplateDecl>(*I)))
Douglas Gregore961afb2009-10-22 07:08:30 +00002286 Method = dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl());
2287
Douglas Gregor3eefb1c2009-10-24 04:59:53 +00002288 // FIXME: Do we have to know if there are explicit template arguments?
Douglas Gregore961afb2009-10-22 07:08:30 +00002289 if (Method && !Method->isStatic()) {
2290 Ctx = Method->getParent();
Douglas Gregore961afb2009-10-22 07:08:30 +00002291 break;
2292 }
2293 }
2294 }
2295
2296 if (!Ctx || !Ctx->isRecord())
2297 return false;
2298
2299 // Determine whether the declaration(s) we found are actually in a base
2300 // class. If not, this isn't an implicit member reference.
2301 ThisType = MD->getThisType(Context);
John McCall129e2df2009-11-30 22:42:35 +00002302
2303 // FIXME: this doesn't really work for overloaded lookups.
Douglas Gregor7a343142009-11-01 17:08:18 +00002304
Douglas Gregore961afb2009-10-22 07:08:30 +00002305 QualType CtxType = Context.getTypeDeclType(cast<CXXRecordDecl>(Ctx));
2306 QualType ClassType
2307 = Context.getTypeDeclType(cast<CXXRecordDecl>(MD->getParent()));
2308 return Context.hasSameType(CtxType, ClassType) ||
2309 IsDerivedFrom(ClassType, CtxType);
2310}
2311