blob: 181c1349bd939e454d80851083a2b104a23a9e06 [file] [log] [blame]
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"
Steve Naroff210679c2007-08-25 14:02:58 +000015#include "clang/AST/ASTContext.h"
Douglas Gregora8f32e02009-10-06 17:59:45 +000016#include "clang/AST/CXXInheritance.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000017#include "clang/AST/ExprCXX.h"
18#include "clang/Basic/PartialDiagnostic.h"
Sebastian Redlb5a57a62008-12-03 20:26:15 +000019#include "clang/Basic/TargetInfo.h"
Anders Carlssond497ba72009-08-26 22:59:12 +000020#include "clang/Lex/Preprocessor.h"
21#include "clang/Parse/DeclSpec.h"
Douglas Gregor3fc749d2008-12-23 00:26:44 +000022#include "llvm/ADT/STLExtras.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000023using namespace clang;
24
Douglas Gregor487a75a2008-11-19 19:09:45 +000025/// ActOnCXXConversionFunctionExpr - Parse a C++ conversion function
Douglas Gregor2def4832008-11-17 20:34:05 +000026/// name (e.g., operator void const *) as an expression. This is
27/// very similar to ActOnIdentifierExpr, except that instead of
28/// providing an identifier the parser provides the type of the
29/// conversion function.
Sebastian Redlcd965b92009-01-18 18:53:16 +000030Sema::OwningExprResult
Douglas Gregor487a75a2008-11-19 19:09:45 +000031Sema::ActOnCXXConversionFunctionExpr(Scope *S, SourceLocation OperatorLoc,
32 TypeTy *Ty, bool HasTrailingLParen,
Sebastian Redlebc07d52009-02-03 20:19:35 +000033 const CXXScopeSpec &SS,
34 bool isAddressOfOperand) {
Argyrios Kyrtzidise8661902009-08-19 01:28:28 +000035 //FIXME: Preserve type source info.
36 QualType ConvType = GetTypeFromParser(Ty);
Douglas Gregor50d62d12009-08-05 05:36:45 +000037 CanQualType ConvTypeCanon = Context.getCanonicalType(ConvType);
Mike Stump1eb44332009-09-09 15:08:12 +000038 DeclarationName ConvName
Douglas Gregor2def4832008-11-17 20:34:05 +000039 = Context.DeclarationNames.getCXXConversionFunctionName(ConvTypeCanon);
Sebastian Redlcd965b92009-01-18 18:53:16 +000040 return ActOnDeclarationNameExpr(S, OperatorLoc, ConvName, HasTrailingLParen,
Douglas Gregor17330012009-02-04 15:01:18 +000041 &SS, isAddressOfOperand);
Douglas Gregor2def4832008-11-17 20:34:05 +000042}
Sebastian Redlc42e1182008-11-11 11:37:55 +000043
Douglas Gregor487a75a2008-11-19 19:09:45 +000044/// ActOnCXXOperatorFunctionIdExpr - Parse a C++ overloaded operator
Douglas Gregore94ca9e42008-11-18 14:39:36 +000045/// name (e.g., @c operator+ ) as an expression. This is very
46/// similar to ActOnIdentifierExpr, except that instead of providing
47/// an identifier the parser provides the kind of overloaded
48/// operator that was parsed.
Sebastian Redlcd965b92009-01-18 18:53:16 +000049Sema::OwningExprResult
Douglas Gregor487a75a2008-11-19 19:09:45 +000050Sema::ActOnCXXOperatorFunctionIdExpr(Scope *S, SourceLocation OperatorLoc,
51 OverloadedOperatorKind Op,
52 bool HasTrailingLParen,
Sebastian Redlebc07d52009-02-03 20:19:35 +000053 const CXXScopeSpec &SS,
54 bool isAddressOfOperand) {
Douglas Gregore94ca9e42008-11-18 14:39:36 +000055 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(Op);
Sebastian Redlebc07d52009-02-03 20:19:35 +000056 return ActOnDeclarationNameExpr(S, OperatorLoc, Name, HasTrailingLParen, &SS,
Douglas Gregor17330012009-02-04 15:01:18 +000057 isAddressOfOperand);
Douglas Gregore94ca9e42008-11-18 14:39:36 +000058}
59
Sebastian Redlc42e1182008-11-11 11:37:55 +000060/// ActOnCXXTypeidOfType - Parse typeid( type-id ).
Sebastian Redlf53597f2009-03-15 17:47:39 +000061Action::OwningExprResult
Sebastian Redlc42e1182008-11-11 11:37:55 +000062Sema::ActOnCXXTypeid(SourceLocation OpLoc, SourceLocation LParenLoc,
63 bool isType, void *TyOrExpr, SourceLocation RParenLoc) {
Douglas Gregor7adb10f2009-09-15 22:30:29 +000064 if (!StdNamespace)
Sebastian Redlf53597f2009-03-15 17:47:39 +000065 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
Argyrios Kyrtzidise8661902009-08-19 01:28:28 +000066
67 if (isType)
68 // FIXME: Preserve type source info.
69 TyOrExpr = GetTypeFromParser(TyOrExpr).getAsOpaquePtr();
70
Chris Lattner572af492008-11-20 05:51:55 +000071 IdentifierInfo *TypeInfoII = &PP.getIdentifierTable().get("type_info");
John McCallf36e02d2009-10-09 21:13:30 +000072 LookupResult R;
73 LookupQualifiedName(R, StdNamespace, TypeInfoII, LookupTagName);
74 Decl *TypeInfoDecl = R.getAsSingleDecl(Context);
Sebastian Redlc42e1182008-11-11 11:37:55 +000075 RecordDecl *TypeInfoRecordDecl = dyn_cast_or_null<RecordDecl>(TypeInfoDecl);
Chris Lattner572af492008-11-20 05:51:55 +000076 if (!TypeInfoRecordDecl)
Sebastian Redlf53597f2009-03-15 17:47:39 +000077 return ExprError(Diag(OpLoc, diag::err_need_header_before_typeid));
Sebastian Redlc42e1182008-11-11 11:37:55 +000078
79 QualType TypeInfoType = Context.getTypeDeclType(TypeInfoRecordDecl);
80
Douglas Gregorac7610d2009-06-22 20:57:11 +000081 if (!isType) {
82 // C++0x [expr.typeid]p3:
Mike Stump1eb44332009-09-09 15:08:12 +000083 // When typeid is applied to an expression other than an lvalue of a
84 // polymorphic class type [...] [the] expression is an unevaluated
Douglas Gregorac7610d2009-06-22 20:57:11 +000085 // operand.
Mike Stump1eb44332009-09-09 15:08:12 +000086
Douglas Gregorac7610d2009-06-22 20:57:11 +000087 // FIXME: if the type of the expression is a class type, the class
88 // shall be completely defined.
89 bool isUnevaluatedOperand = true;
90 Expr *E = static_cast<Expr *>(TyOrExpr);
91 if (E && !E->isTypeDependent() && E->isLvalue(Context) == Expr::LV_Valid) {
92 QualType T = E->getType();
Ted Kremenek6217b802009-07-29 21:53:49 +000093 if (const RecordType *RecordT = T->getAs<RecordType>()) {
Douglas Gregorac7610d2009-06-22 20:57:11 +000094 CXXRecordDecl *RecordD = cast<CXXRecordDecl>(RecordT->getDecl());
95 if (RecordD->isPolymorphic())
96 isUnevaluatedOperand = false;
97 }
98 }
Mike Stump1eb44332009-09-09 15:08:12 +000099
Douglas Gregorac7610d2009-06-22 20:57:11 +0000100 // If this is an unevaluated operand, clear out the set of declaration
101 // references we have been computing.
102 if (isUnevaluatedOperand)
103 PotentiallyReferencedDeclStack.back().clear();
104 }
Mike Stump1eb44332009-09-09 15:08:12 +0000105
Sebastian Redlf53597f2009-03-15 17:47:39 +0000106 return Owned(new (Context) CXXTypeidExpr(isType, TyOrExpr,
107 TypeInfoType.withConst(),
108 SourceRange(OpLoc, RParenLoc)));
Sebastian Redlc42e1182008-11-11 11:37:55 +0000109}
110
Steve Naroff1b273c42007-09-16 14:56:35 +0000111/// ActOnCXXBoolLiteral - Parse {true,false} literals.
Sebastian Redlf53597f2009-03-15 17:47:39 +0000112Action::OwningExprResult
Steve Naroff1b273c42007-09-16 14:56:35 +0000113Sema::ActOnCXXBoolLiteral(SourceLocation OpLoc, tok::TokenKind Kind) {
Douglas Gregor2f639b92008-10-24 15:36:09 +0000114 assert((Kind == tok::kw_true || Kind == tok::kw_false) &&
Reid Spencer5f016e22007-07-11 17:01:13 +0000115 "Unknown C++ Boolean value!");
Sebastian Redlf53597f2009-03-15 17:47:39 +0000116 return Owned(new (Context) CXXBoolLiteralExpr(Kind == tok::kw_true,
117 Context.BoolTy, OpLoc));
Reid Spencer5f016e22007-07-11 17:01:13 +0000118}
Chris Lattner50dd2892008-02-26 00:51:44 +0000119
Sebastian Redl6e8ed162009-05-10 18:38:11 +0000120/// ActOnCXXNullPtrLiteral - Parse 'nullptr'.
121Action::OwningExprResult
122Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
123 return Owned(new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc));
124}
125
Chris Lattner50dd2892008-02-26 00:51:44 +0000126/// ActOnCXXThrow - Parse throw expressions.
Sebastian Redlf53597f2009-03-15 17:47:39 +0000127Action::OwningExprResult
128Sema::ActOnCXXThrow(SourceLocation OpLoc, ExprArg E) {
Sebastian Redl972041f2009-04-27 20:27:31 +0000129 Expr *Ex = E.takeAs<Expr>();
130 if (Ex && !Ex->isTypeDependent() && CheckCXXThrowOperand(OpLoc, Ex))
131 return ExprError();
132 return Owned(new (Context) CXXThrowExpr(Ex, Context.VoidTy, OpLoc));
133}
134
135/// CheckCXXThrowOperand - Validate the operand of a throw.
136bool Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *&E) {
137 // C++ [except.throw]p3:
138 // [...] adjusting the type from "array of T" or "function returning T"
139 // to "pointer to T" or "pointer to function returning T", [...]
140 DefaultFunctionArrayConversion(E);
141
142 // If the type of the exception would be an incomplete type or a pointer
143 // to an incomplete type other than (cv) void the program is ill-formed.
144 QualType Ty = E->getType();
145 int isPointer = 0;
Ted Kremenek6217b802009-07-29 21:53:49 +0000146 if (const PointerType* Ptr = Ty->getAs<PointerType>()) {
Sebastian Redl972041f2009-04-27 20:27:31 +0000147 Ty = Ptr->getPointeeType();
148 isPointer = 1;
149 }
150 if (!isPointer || !Ty->isVoidType()) {
151 if (RequireCompleteType(ThrowLoc, Ty,
Anders Carlssond497ba72009-08-26 22:59:12 +0000152 PDiag(isPointer ? diag::err_throw_incomplete_ptr
153 : diag::err_throw_incomplete)
154 << E->getSourceRange()))
Sebastian Redl972041f2009-04-27 20:27:31 +0000155 return true;
156 }
157
158 // FIXME: Construct a temporary here.
159 return false;
Chris Lattner50dd2892008-02-26 00:51:44 +0000160}
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000161
Sebastian Redlf53597f2009-03-15 17:47:39 +0000162Action::OwningExprResult Sema::ActOnCXXThis(SourceLocation ThisLoc) {
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000163 /// C++ 9.3.2: In the body of a non-static member function, the keyword this
164 /// is a non-lvalue expression whose value is the address of the object for
165 /// which the function is called.
166
Sebastian Redlf53597f2009-03-15 17:47:39 +0000167 if (!isa<FunctionDecl>(CurContext))
168 return ExprError(Diag(ThisLoc, diag::err_invalid_this_use));
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000169
170 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext))
171 if (MD->isInstance())
Sebastian Redlf53597f2009-03-15 17:47:39 +0000172 return Owned(new (Context) CXXThisExpr(ThisLoc,
173 MD->getThisType(Context)));
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000174
Sebastian Redlf53597f2009-03-15 17:47:39 +0000175 return ExprError(Diag(ThisLoc, diag::err_invalid_this_use));
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000176}
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000177
178/// ActOnCXXTypeConstructExpr - Parse construction of a specified type.
179/// Can be interpreted either as function-style casting ("int(x)")
180/// or class type construction ("ClassType(x,y,z)")
181/// or creation of a value-initialized type ("int()").
Sebastian Redlf53597f2009-03-15 17:47:39 +0000182Action::OwningExprResult
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000183Sema::ActOnCXXTypeConstructExpr(SourceRange TypeRange, TypeTy *TypeRep,
184 SourceLocation LParenLoc,
Sebastian Redlf53597f2009-03-15 17:47:39 +0000185 MultiExprArg exprs,
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000186 SourceLocation *CommaLocs,
187 SourceLocation RParenLoc) {
188 assert(TypeRep && "Missing type!");
Argyrios Kyrtzidise8661902009-08-19 01:28:28 +0000189 // FIXME: Preserve type source info.
190 QualType Ty = GetTypeFromParser(TypeRep);
Sebastian Redlf53597f2009-03-15 17:47:39 +0000191 unsigned NumExprs = exprs.size();
192 Expr **Exprs = (Expr**)exprs.get();
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000193 SourceLocation TyBeginLoc = TypeRange.getBegin();
194 SourceRange FullRange = SourceRange(TyBeginLoc, RParenLoc);
195
Sebastian Redlf53597f2009-03-15 17:47:39 +0000196 if (Ty->isDependentType() ||
Douglas Gregorba498172009-03-13 21:01:28 +0000197 CallExpr::hasAnyTypeDependentArguments(Exprs, NumExprs)) {
Sebastian Redlf53597f2009-03-15 17:47:39 +0000198 exprs.release();
Mike Stump1eb44332009-09-09 15:08:12 +0000199
200 return Owned(CXXUnresolvedConstructExpr::Create(Context,
201 TypeRange.getBegin(), Ty,
Douglas Gregord81e6ca2009-05-20 18:46:25 +0000202 LParenLoc,
203 Exprs, NumExprs,
204 RParenLoc));
Douglas Gregorba498172009-03-13 21:01:28 +0000205 }
206
Anders Carlssonbb60a502009-08-27 03:53:50 +0000207 if (Ty->isArrayType())
208 return ExprError(Diag(TyBeginLoc,
209 diag::err_value_init_for_array_type) << FullRange);
210 if (!Ty->isVoidType() &&
211 RequireCompleteType(TyBeginLoc, Ty,
212 PDiag(diag::err_invalid_incomplete_type_use)
213 << FullRange))
214 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +0000215
Anders Carlssonbb60a502009-08-27 03:53:50 +0000216 if (RequireNonAbstractType(TyBeginLoc, Ty,
217 diag::err_allocation_of_abstract_type))
218 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +0000219
220
Douglas Gregor506ae412009-01-16 18:33:17 +0000221 // C++ [expr.type.conv]p1:
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000222 // If the expression list is a single expression, the type conversion
223 // expression is equivalent (in definedness, and if defined in meaning) to the
224 // corresponding cast expression.
225 //
226 if (NumExprs == 1) {
Anders Carlssoncdb61972009-08-07 22:21:05 +0000227 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
Anders Carlsson0aebc812009-09-09 21:33:21 +0000228 CXXMethodDecl *Method = 0;
229 if (CheckCastTypes(TypeRange, Ty, Exprs[0], Kind, Method,
230 /*FunctionalStyle=*/true))
Sebastian Redlf53597f2009-03-15 17:47:39 +0000231 return ExprError();
Anders Carlsson0aebc812009-09-09 21:33:21 +0000232
233 exprs.release();
234 if (Method) {
235 OwningExprResult CastArg
236 = BuildCXXCastArgument(TypeRange.getBegin(), Ty.getNonReferenceType(),
237 Kind, Method, Owned(Exprs[0]));
238 if (CastArg.isInvalid())
239 return ExprError();
240
241 Exprs[0] = CastArg.takeAs<Expr>();
Fariborz Jahanian4fc7ab32009-08-28 15:11:24 +0000242 }
Anders Carlsson0aebc812009-09-09 21:33:21 +0000243
244 return Owned(new (Context) CXXFunctionalCastExpr(Ty.getNonReferenceType(),
245 Ty, TyBeginLoc, Kind,
246 Exprs[0], RParenLoc));
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000247 }
248
Ted Kremenek6217b802009-07-29 21:53:49 +0000249 if (const RecordType *RT = Ty->getAs<RecordType>()) {
Douglas Gregor506ae412009-01-16 18:33:17 +0000250 CXXRecordDecl *Record = cast<CXXRecordDecl>(RT->getDecl());
Sebastian Redlf53597f2009-03-15 17:47:39 +0000251
Mike Stump1eb44332009-09-09 15:08:12 +0000252 if (NumExprs > 1 || !Record->hasTrivialConstructor() ||
Anders Carlssone7624a72009-08-27 05:08:22 +0000253 !Record->hasTrivialDestructor()) {
Douglas Gregor39da0b82009-09-09 23:08:42 +0000254 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
255
Douglas Gregor506ae412009-01-16 18:33:17 +0000256 CXXConstructorDecl *Constructor
Douglas Gregor39da0b82009-09-09 23:08:42 +0000257 = PerformInitializationByConstructor(Ty, move(exprs),
Douglas Gregor506ae412009-01-16 18:33:17 +0000258 TypeRange.getBegin(),
259 SourceRange(TypeRange.getBegin(),
260 RParenLoc),
261 DeclarationName(),
Douglas Gregor39da0b82009-09-09 23:08:42 +0000262 IK_Direct,
263 ConstructorArgs);
Douglas Gregor506ae412009-01-16 18:33:17 +0000264
Sebastian Redlf53597f2009-03-15 17:47:39 +0000265 if (!Constructor)
266 return ExprError();
267
Mike Stump1eb44332009-09-09 15:08:12 +0000268 OwningExprResult Result =
269 BuildCXXTemporaryObjectExpr(Constructor, Ty, TyBeginLoc,
Douglas Gregor39da0b82009-09-09 23:08:42 +0000270 move_arg(ConstructorArgs), RParenLoc);
Anders Carlssone7624a72009-08-27 05:08:22 +0000271 if (Result.isInvalid())
272 return ExprError();
Mike Stump1eb44332009-09-09 15:08:12 +0000273
Anders Carlssone7624a72009-08-27 05:08:22 +0000274 return MaybeBindToTemporary(Result.takeAs<Expr>());
Douglas Gregor506ae412009-01-16 18:33:17 +0000275 }
276
277 // Fall through to value-initialize an object of class type that
278 // doesn't have a user-declared default constructor.
279 }
280
281 // C++ [expr.type.conv]p1:
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000282 // If the expression list specifies more than a single value, the type shall
283 // be a class with a suitably declared constructor.
284 //
285 if (NumExprs > 1)
Sebastian Redlf53597f2009-03-15 17:47:39 +0000286 return ExprError(Diag(CommaLocs[0],
287 diag::err_builtin_func_cast_more_than_one_arg)
288 << FullRange);
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000289
290 assert(NumExprs == 0 && "Expected 0 expressions");
291
Douglas Gregor506ae412009-01-16 18:33:17 +0000292 // C++ [expr.type.conv]p2:
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000293 // The expression T(), where T is a simple-type-specifier for a non-array
294 // complete object type or the (possibly cv-qualified) void type, creates an
295 // rvalue of the specified type, which is value-initialized.
296 //
Sebastian Redlf53597f2009-03-15 17:47:39 +0000297 exprs.release();
298 return Owned(new (Context) CXXZeroInitValueExpr(Ty, TyBeginLoc, RParenLoc));
Argyrios Kyrtzidis987a14b2008-08-22 15:38:55 +0000299}
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000300
301
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000302/// ActOnCXXNew - Parsed a C++ 'new' expression (C++ 5.3.4), as in e.g.:
303/// @code new (memory) int[size][4] @endcode
304/// or
305/// @code ::new Foo(23, "hello") @endcode
306/// For the interpretation of this heap of arguments, consult the base version.
Sebastian Redlf53597f2009-03-15 17:47:39 +0000307Action::OwningExprResult
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000308Sema::ActOnCXXNew(SourceLocation StartLoc, bool UseGlobal,
Sebastian Redlf53597f2009-03-15 17:47:39 +0000309 SourceLocation PlacementLParen, MultiExprArg PlacementArgs,
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000310 SourceLocation PlacementRParen, bool ParenTypeId,
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000311 Declarator &D, SourceLocation ConstructorLParen,
Sebastian Redlf53597f2009-03-15 17:47:39 +0000312 MultiExprArg ConstructorArgs,
Mike Stump1eb44332009-09-09 15:08:12 +0000313 SourceLocation ConstructorRParen) {
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000314 Expr *ArraySize = 0;
315 unsigned Skip = 0;
316 // If the specified type is an array, unwrap it and save the expression.
317 if (D.getNumTypeObjects() > 0 &&
318 D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
319 DeclaratorChunk &Chunk = D.getTypeObject(0);
320 if (Chunk.Arr.hasStatic)
Sebastian Redlf53597f2009-03-15 17:47:39 +0000321 return ExprError(Diag(Chunk.Loc, diag::err_static_illegal_in_new)
322 << D.getSourceRange());
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000323 if (!Chunk.Arr.NumElts)
Sebastian Redlf53597f2009-03-15 17:47:39 +0000324 return ExprError(Diag(Chunk.Loc, diag::err_array_new_needs_size)
325 << D.getSourceRange());
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000326 ArraySize = static_cast<Expr*>(Chunk.Arr.NumElts);
327 Skip = 1;
328 }
329
Douglas Gregor043cad22009-09-11 00:18:58 +0000330 // Every dimension shall be of constant size.
331 if (D.getNumTypeObjects() > 0 &&
332 D.getTypeObject(0).Kind == DeclaratorChunk::Array) {
333 for (unsigned I = 1, N = D.getNumTypeObjects(); I < N; ++I) {
334 if (D.getTypeObject(I).Kind != DeclaratorChunk::Array)
335 break;
336
337 DeclaratorChunk::ArrayTypeInfo &Array = D.getTypeObject(I).Arr;
338 if (Expr *NumElts = (Expr *)Array.NumElts) {
339 if (!NumElts->isTypeDependent() && !NumElts->isValueDependent() &&
340 !NumElts->isIntegerConstantExpr(Context)) {
341 Diag(D.getTypeObject(I).Loc, diag::err_new_array_nonconst)
342 << NumElts->getSourceRange();
343 return ExprError();
344 }
345 }
346 }
347 }
348
Argyrios Kyrtzidisa1d56622009-08-19 01:27:57 +0000349 //FIXME: Store DeclaratorInfo in CXXNew expression.
350 DeclaratorInfo *DInfo = 0;
351 QualType AllocType = GetTypeForDeclarator(D, /*Scope=*/0, &DInfo, Skip);
Chris Lattnereaaebc72009-04-25 08:06:05 +0000352 if (D.isInvalidType())
Sebastian Redlf53597f2009-03-15 17:47:39 +0000353 return ExprError();
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000354
Mike Stump1eb44332009-09-09 15:08:12 +0000355 return BuildCXXNew(StartLoc, UseGlobal,
Douglas Gregor3433cf72009-05-21 00:00:09 +0000356 PlacementLParen,
Mike Stump1eb44332009-09-09 15:08:12 +0000357 move(PlacementArgs),
Douglas Gregor3433cf72009-05-21 00:00:09 +0000358 PlacementRParen,
359 ParenTypeId,
Mike Stump1eb44332009-09-09 15:08:12 +0000360 AllocType,
Douglas Gregor3433cf72009-05-21 00:00:09 +0000361 D.getSourceRange().getBegin(),
362 D.getSourceRange(),
363 Owned(ArraySize),
364 ConstructorLParen,
365 move(ConstructorArgs),
366 ConstructorRParen);
367}
368
Mike Stump1eb44332009-09-09 15:08:12 +0000369Sema::OwningExprResult
Douglas Gregor3433cf72009-05-21 00:00:09 +0000370Sema::BuildCXXNew(SourceLocation StartLoc, bool UseGlobal,
371 SourceLocation PlacementLParen,
372 MultiExprArg PlacementArgs,
373 SourceLocation PlacementRParen,
Mike Stump1eb44332009-09-09 15:08:12 +0000374 bool ParenTypeId,
Douglas Gregor3433cf72009-05-21 00:00:09 +0000375 QualType AllocType,
376 SourceLocation TypeLoc,
377 SourceRange TypeRange,
378 ExprArg ArraySizeE,
379 SourceLocation ConstructorLParen,
380 MultiExprArg ConstructorArgs,
381 SourceLocation ConstructorRParen) {
382 if (CheckAllocatedType(AllocType, TypeLoc, TypeRange))
Sebastian Redlf53597f2009-03-15 17:47:39 +0000383 return ExprError();
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000384
Douglas Gregor3433cf72009-05-21 00:00:09 +0000385 QualType ResultType = Context.getPointerType(AllocType);
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000386
387 // That every array dimension except the first is constant was already
388 // checked by the type check above.
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000389
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000390 // C++ 5.3.4p6: "The expression in a direct-new-declarator shall have integral
391 // or enumeration type with a non-negative value."
Douglas Gregor3433cf72009-05-21 00:00:09 +0000392 Expr *ArraySize = (Expr *)ArraySizeE.get();
Sebastian Redl28507842009-02-26 14:39:58 +0000393 if (ArraySize && !ArraySize->isTypeDependent()) {
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000394 QualType SizeType = ArraySize->getType();
395 if (!SizeType->isIntegralType() && !SizeType->isEnumeralType())
Sebastian Redlf53597f2009-03-15 17:47:39 +0000396 return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
397 diag::err_array_size_not_integral)
398 << SizeType << ArraySize->getSourceRange());
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000399 // Let's see if this is a constant < 0. If so, we reject it out of hand.
400 // We don't care about special rules, so we tell the machinery it's not
401 // evaluated - it gives us a result in more cases.
Sebastian Redl28507842009-02-26 14:39:58 +0000402 if (!ArraySize->isValueDependent()) {
403 llvm::APSInt Value;
404 if (ArraySize->isIntegerConstantExpr(Value, Context, 0, false)) {
405 if (Value < llvm::APSInt(
Anders Carlssonac18b2e2009-09-23 00:37:25 +0000406 llvm::APInt::getNullValue(Value.getBitWidth()),
407 Value.isUnsigned()))
Sebastian Redlf53597f2009-03-15 17:47:39 +0000408 return ExprError(Diag(ArraySize->getSourceRange().getBegin(),
409 diag::err_typecheck_negative_array_size)
410 << ArraySize->getSourceRange());
Sebastian Redl28507842009-02-26 14:39:58 +0000411 }
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000412 }
Anders Carlssonac18b2e2009-09-23 00:37:25 +0000413
Eli Friedman73c39ab2009-10-20 08:27:19 +0000414 ImpCastExprToType(ArraySize, Context.getSizeType(),
415 CastExpr::CK_IntegralCast);
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000416 }
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000417
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000418 FunctionDecl *OperatorNew = 0;
419 FunctionDecl *OperatorDelete = 0;
Sebastian Redlf53597f2009-03-15 17:47:39 +0000420 Expr **PlaceArgs = (Expr**)PlacementArgs.get();
421 unsigned NumPlaceArgs = PlacementArgs.size();
Douglas Gregor089407b2009-10-17 21:40:42 +0000422
Sebastian Redl28507842009-02-26 14:39:58 +0000423 if (!AllocType->isDependentType() &&
424 !Expr::hasAnyTypeDependentArguments(PlaceArgs, NumPlaceArgs) &&
425 FindAllocationFunctions(StartLoc,
Sebastian Redl00e68e22009-02-09 18:24:27 +0000426 SourceRange(PlacementLParen, PlacementRParen),
427 UseGlobal, AllocType, ArraySize, PlaceArgs,
428 NumPlaceArgs, OperatorNew, OperatorDelete))
Sebastian Redlf53597f2009-03-15 17:47:39 +0000429 return ExprError();
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000430
431 bool Init = ConstructorLParen.isValid();
432 // --- Choosing a constructor ---
433 // C++ 5.3.4p15
434 // 1) If T is a POD and there's no initializer (ConstructorLParen is invalid)
435 // the object is not initialized. If the object, or any part of it, is
436 // const-qualified, it's an error.
437 // 2) If T is a POD and there's an empty initializer, the object is value-
438 // initialized.
439 // 3) If T is a POD and there's one initializer argument, the object is copy-
440 // constructed.
441 // 4) If T is a POD and there's more initializer arguments, it's an error.
442 // 5) If T is not a POD, the initializer arguments are used as constructor
443 // arguments.
444 //
445 // Or by the C++0x formulation:
446 // 1) If there's no initializer, the object is default-initialized according
447 // to C++0x rules.
448 // 2) Otherwise, the object is direct-initialized.
449 CXXConstructorDecl *Constructor = 0;
Sebastian Redlf53597f2009-03-15 17:47:39 +0000450 Expr **ConsArgs = (Expr**)ConstructorArgs.get();
Sebastian Redl4f149632009-05-07 16:14:23 +0000451 const RecordType *RT;
Sebastian Redlf53597f2009-03-15 17:47:39 +0000452 unsigned NumConsArgs = ConstructorArgs.size();
Douglas Gregor089407b2009-10-17 21:40:42 +0000453
454 if (AllocType->isDependentType() ||
455 Expr::hasAnyTypeDependentArguments(ConsArgs, NumConsArgs)) {
Sebastian Redl28507842009-02-26 14:39:58 +0000456 // Skip all the checks.
Mike Stumpac5fc7c2009-08-04 21:02:39 +0000457 } else if ((RT = AllocType->getAs<RecordType>()) &&
458 !AllocType->isAggregateType()) {
Douglas Gregor39da0b82009-09-09 23:08:42 +0000459 ASTOwningVector<&ActionBase::DeleteExpr> ConvertedConstructorArgs(*this);
460
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000461 Constructor = PerformInitializationByConstructor(
Douglas Gregor39da0b82009-09-09 23:08:42 +0000462 AllocType, move(ConstructorArgs),
Douglas Gregor3433cf72009-05-21 00:00:09 +0000463 TypeLoc,
464 SourceRange(TypeLoc, ConstructorRParen),
Chris Lattnerd9d22dd2008-11-24 05:29:24 +0000465 RT->getDecl()->getDeclName(),
Douglas Gregor39da0b82009-09-09 23:08:42 +0000466 NumConsArgs != 0 ? IK_Direct : IK_Default,
467 ConvertedConstructorArgs);
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000468 if (!Constructor)
Sebastian Redlf53597f2009-03-15 17:47:39 +0000469 return ExprError();
Douglas Gregor39da0b82009-09-09 23:08:42 +0000470
471 // Take the converted constructor arguments and use them for the new
472 // expression.
473 NumConsArgs = ConvertedConstructorArgs.size();
474 ConsArgs = (Expr **)ConvertedConstructorArgs.take();
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000475 } else {
476 if (!Init) {
477 // FIXME: Check that no subpart is const.
Sebastian Redlf53597f2009-03-15 17:47:39 +0000478 if (AllocType.isConstQualified())
479 return ExprError(Diag(StartLoc, diag::err_new_uninitialized_const)
Douglas Gregor3433cf72009-05-21 00:00:09 +0000480 << TypeRange);
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000481 } else if (NumConsArgs == 0) {
482 // Object is value-initialized. Do nothing.
483 } else if (NumConsArgs == 1) {
484 // Object is direct-initialized.
Sebastian Redl4f149632009-05-07 16:14:23 +0000485 // FIXME: What DeclarationName do we pass in here?
Sebastian Redlcee63fb2008-12-02 14:43:59 +0000486 if (CheckInitializerTypes(ConsArgs[0], AllocType, StartLoc,
Douglas Gregor09f41cf2009-01-14 15:45:31 +0000487 DeclarationName() /*AllocType.getAsString()*/,
488 /*DirectInit=*/true))
Sebastian Redlf53597f2009-03-15 17:47:39 +0000489 return ExprError();
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000490 } else {
Sebastian Redlf53597f2009-03-15 17:47:39 +0000491 return ExprError(Diag(StartLoc,
492 diag::err_builtin_direct_init_more_than_one_arg)
493 << SourceRange(ConstructorLParen, ConstructorRParen));
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000494 }
495 }
496
497 // FIXME: Also check that the destructor is accessible. (C++ 5.3.4p16)
Douglas Gregor089407b2009-10-17 21:40:42 +0000498
Sebastian Redlf53597f2009-03-15 17:47:39 +0000499 PlacementArgs.release();
500 ConstructorArgs.release();
Douglas Gregor3433cf72009-05-21 00:00:09 +0000501 ArraySizeE.release();
Sebastian Redlf53597f2009-03-15 17:47:39 +0000502 return Owned(new (Context) CXXNewExpr(UseGlobal, OperatorNew, PlaceArgs,
Ted Kremenek8189cde2009-02-07 01:47:29 +0000503 NumPlaceArgs, ParenTypeId, ArraySize, Constructor, Init,
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000504 ConsArgs, NumConsArgs, OperatorDelete, ResultType,
Mike Stump1eb44332009-09-09 15:08:12 +0000505 StartLoc, Init ? ConstructorRParen : SourceLocation()));
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000506}
507
508/// CheckAllocatedType - Checks that a type is suitable as the allocated type
509/// in a new-expression.
510/// dimension off and stores the size expression in ArraySize.
Douglas Gregor3433cf72009-05-21 00:00:09 +0000511bool Sema::CheckAllocatedType(QualType AllocType, SourceLocation Loc,
Mike Stump1eb44332009-09-09 15:08:12 +0000512 SourceRange R) {
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000513 // C++ 5.3.4p1: "[The] type shall be a complete object type, but not an
514 // abstract class type or array thereof.
Douglas Gregore7450f52009-03-24 19:52:54 +0000515 if (AllocType->isFunctionType())
Douglas Gregor3433cf72009-05-21 00:00:09 +0000516 return Diag(Loc, diag::err_bad_new_type)
517 << AllocType << 0 << R;
Douglas Gregore7450f52009-03-24 19:52:54 +0000518 else if (AllocType->isReferenceType())
Douglas Gregor3433cf72009-05-21 00:00:09 +0000519 return Diag(Loc, diag::err_bad_new_type)
520 << AllocType << 1 << R;
Douglas Gregore7450f52009-03-24 19:52:54 +0000521 else if (!AllocType->isDependentType() &&
Douglas Gregor3433cf72009-05-21 00:00:09 +0000522 RequireCompleteType(Loc, AllocType,
Anders Carlssonb7906612009-08-26 23:45:07 +0000523 PDiag(diag::err_new_incomplete_type)
524 << R))
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000525 return true;
Douglas Gregor3433cf72009-05-21 00:00:09 +0000526 else if (RequireNonAbstractType(Loc, AllocType,
Douglas Gregore7450f52009-03-24 19:52:54 +0000527 diag::err_allocation_of_abstract_type))
528 return true;
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000529
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000530 return false;
531}
532
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000533/// FindAllocationFunctions - Finds the overloads of operator new and delete
534/// that are appropriate for the allocation.
Sebastian Redl00e68e22009-02-09 18:24:27 +0000535bool Sema::FindAllocationFunctions(SourceLocation StartLoc, SourceRange Range,
536 bool UseGlobal, QualType AllocType,
537 bool IsArray, Expr **PlaceArgs,
538 unsigned NumPlaceArgs,
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000539 FunctionDecl *&OperatorNew,
Mike Stump1eb44332009-09-09 15:08:12 +0000540 FunctionDecl *&OperatorDelete) {
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000541 // --- Choosing an allocation function ---
542 // C++ 5.3.4p8 - 14 & 18
543 // 1) If UseGlobal is true, only look in the global scope. Else, also look
544 // in the scope of the allocated class.
545 // 2) If an array size is given, look for operator new[], else look for
546 // operator new.
547 // 3) The first argument is always size_t. Append the arguments from the
548 // placement form.
549 // FIXME: Also find the appropriate delete operator.
550
551 llvm::SmallVector<Expr*, 8> AllocArgs(1 + NumPlaceArgs);
552 // We don't care about the actual value of this argument.
553 // FIXME: Should the Sema create the expression and embed it in the syntax
554 // tree? Or should the consumer just recalculate the value?
Anders Carlssond67c4c32009-08-16 20:29:29 +0000555 IntegerLiteral Size(llvm::APInt::getNullValue(
556 Context.Target.getPointerWidth(0)),
557 Context.getSizeType(),
558 SourceLocation());
559 AllocArgs[0] = &Size;
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000560 std::copy(PlaceArgs, PlaceArgs + NumPlaceArgs, AllocArgs.begin() + 1);
561
562 DeclarationName NewName = Context.DeclarationNames.getCXXOperatorName(
563 IsArray ? OO_Array_New : OO_New);
564 if (AllocType->isRecordType() && !UseGlobal) {
Mike Stump1eb44332009-09-09 15:08:12 +0000565 CXXRecordDecl *Record
Ted Kremenek6217b802009-07-29 21:53:49 +0000566 = cast<CXXRecordDecl>(AllocType->getAs<RecordType>()->getDecl());
Sebastian Redl7f662392008-12-04 22:20:51 +0000567 // FIXME: We fail to find inherited overloads.
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(), Record, /*AllowMissing=*/true,
570 OperatorNew))
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000571 return true;
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000572 }
573 if (!OperatorNew) {
574 // Didn't find a member overload. Look for a global one.
575 DeclareGlobalNewDelete();
Sebastian Redl7f662392008-12-04 22:20:51 +0000576 DeclContext *TUDecl = Context.getTranslationUnitDecl();
Sebastian Redl00e68e22009-02-09 18:24:27 +0000577 if (FindAllocationOverload(StartLoc, Range, NewName, &AllocArgs[0],
Sebastian Redl7f662392008-12-04 22:20:51 +0000578 AllocArgs.size(), TUDecl, /*AllowMissing=*/false,
579 OperatorNew))
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000580 return true;
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000581 }
582
Anders Carlssond9583892009-05-31 20:26:12 +0000583 // FindAllocationOverload can change the passed in arguments, so we need to
584 // copy them back.
585 if (NumPlaceArgs > 0)
586 std::copy(&AllocArgs[1], AllocArgs.end(), PlaceArgs);
Mike Stump1eb44332009-09-09 15:08:12 +0000587
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000588 return false;
589}
590
Sebastian Redl7f662392008-12-04 22:20:51 +0000591/// FindAllocationOverload - Find an fitting overload for the allocation
592/// function in the specified scope.
Sebastian Redl00e68e22009-02-09 18:24:27 +0000593bool Sema::FindAllocationOverload(SourceLocation StartLoc, SourceRange Range,
594 DeclarationName Name, Expr** Args,
595 unsigned NumArgs, DeclContext *Ctx,
Mike Stump1eb44332009-09-09 15:08:12 +0000596 bool AllowMissing, FunctionDecl *&Operator) {
John McCallf36e02d2009-10-09 21:13:30 +0000597 LookupResult R;
598 LookupQualifiedName(R, Ctx, Name, LookupOrdinaryName);
599 if (R.empty()) {
Sebastian Redl7f662392008-12-04 22:20:51 +0000600 if (AllowMissing)
601 return false;
Sebastian Redl7f662392008-12-04 22:20:51 +0000602 return Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
Chris Lattner4330d652009-02-17 07:29:20 +0000603 << Name << Range;
Sebastian Redl7f662392008-12-04 22:20:51 +0000604 }
605
John McCallf36e02d2009-10-09 21:13:30 +0000606 // FIXME: handle ambiguity
607
Sebastian Redl7f662392008-12-04 22:20:51 +0000608 OverloadCandidateSet Candidates;
Douglas Gregor5d64e5b2009-09-30 00:03:47 +0000609 for (LookupResult::iterator Alloc = R.begin(), AllocEnd = R.end();
610 Alloc != AllocEnd; ++Alloc) {
Douglas Gregor3fc749d2008-12-23 00:26:44 +0000611 // Even member operator new/delete are implicitly treated as
612 // static, so don't use AddMemberCandidate.
Douglas Gregor90916562009-09-29 18:16:17 +0000613 if (FunctionDecl *Fn = dyn_cast<FunctionDecl>(*Alloc)) {
Douglas Gregor3fc749d2008-12-23 00:26:44 +0000614 AddOverloadCandidate(Fn, Args, NumArgs, Candidates,
615 /*SuppressUserConversions=*/false);
Douglas Gregor90916562009-09-29 18:16:17 +0000616 continue;
617 }
618
619 // FIXME: Handle function templates
Sebastian Redl7f662392008-12-04 22:20:51 +0000620 }
621
622 // Do the resolution.
623 OverloadCandidateSet::iterator Best;
Douglas Gregore0762c92009-06-19 23:52:42 +0000624 switch(BestViableFunction(Candidates, StartLoc, Best)) {
Sebastian Redl7f662392008-12-04 22:20:51 +0000625 case OR_Success: {
626 // Got one!
627 FunctionDecl *FnDecl = Best->Function;
628 // The first argument is size_t, and the first parameter must be size_t,
629 // too. This is checked on declaration and can be assumed. (It can't be
630 // asserted on, though, since invalid decls are left in there.)
Douglas Gregor90916562009-09-29 18:16:17 +0000631 for (unsigned i = 0; i < NumArgs; ++i) {
Sebastian Redl7f662392008-12-04 22:20:51 +0000632 // FIXME: Passing word to diagnostic.
Anders Carlssonfc27d262009-05-31 19:49:47 +0000633 if (PerformCopyInitialization(Args[i],
Sebastian Redl7f662392008-12-04 22:20:51 +0000634 FnDecl->getParamDecl(i)->getType(),
635 "passing"))
636 return true;
637 }
638 Operator = FnDecl;
639 return false;
640 }
641
642 case OR_No_Viable_Function:
Sebastian Redl7f662392008-12-04 22:20:51 +0000643 Diag(StartLoc, diag::err_ovl_no_viable_function_in_call)
Chris Lattner4330d652009-02-17 07:29:20 +0000644 << Name << Range;
Sebastian Redl7f662392008-12-04 22:20:51 +0000645 PrintOverloadCandidates(Candidates, /*OnlyViable=*/false);
646 return true;
647
648 case OR_Ambiguous:
Sebastian Redl7f662392008-12-04 22:20:51 +0000649 Diag(StartLoc, diag::err_ovl_ambiguous_call)
Sebastian Redl00e68e22009-02-09 18:24:27 +0000650 << Name << Range;
Sebastian Redl7f662392008-12-04 22:20:51 +0000651 PrintOverloadCandidates(Candidates, /*OnlyViable=*/true);
652 return true;
Douglas Gregor48f3bb92009-02-18 21:56:37 +0000653
654 case OR_Deleted:
655 Diag(StartLoc, diag::err_ovl_deleted_call)
656 << Best->Function->isDeleted()
657 << Name << Range;
658 PrintOverloadCandidates(Candidates, /*OnlyViable=*/true);
659 return true;
Sebastian Redl7f662392008-12-04 22:20:51 +0000660 }
661 assert(false && "Unreachable, bad result from BestViableFunction");
662 return true;
663}
664
665
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000666/// DeclareGlobalNewDelete - Declare the global forms of operator new and
667/// delete. These are:
668/// @code
669/// void* operator new(std::size_t) throw(std::bad_alloc);
670/// void* operator new[](std::size_t) throw(std::bad_alloc);
671/// void operator delete(void *) throw();
672/// void operator delete[](void *) throw();
673/// @endcode
674/// Note that the placement and nothrow forms of new are *not* implicitly
675/// declared. Their use requires including \<new\>.
Mike Stump1eb44332009-09-09 15:08:12 +0000676void Sema::DeclareGlobalNewDelete() {
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000677 if (GlobalNewDeleteDeclared)
678 return;
Douglas Gregor7adb10f2009-09-15 22:30:29 +0000679
680 // C++ [basic.std.dynamic]p2:
681 // [...] The following allocation and deallocation functions (18.4) are
682 // implicitly declared in global scope in each translation unit of a
683 // program
684 //
685 // void* operator new(std::size_t) throw(std::bad_alloc);
686 // void* operator new[](std::size_t) throw(std::bad_alloc);
687 // void operator delete(void*) throw();
688 // void operator delete[](void*) throw();
689 //
690 // These implicit declarations introduce only the function names operator
691 // new, operator new[], operator delete, operator delete[].
692 //
693 // Here, we need to refer to std::bad_alloc, so we will implicitly declare
694 // "std" or "bad_alloc" as necessary to form the exception specification.
695 // However, we do not make these implicit declarations visible to name
696 // lookup.
697 if (!StdNamespace) {
698 // The "std" namespace has not yet been defined, so build one implicitly.
699 StdNamespace = NamespaceDecl::Create(Context,
700 Context.getTranslationUnitDecl(),
701 SourceLocation(),
702 &PP.getIdentifierTable().get("std"));
703 StdNamespace->setImplicit(true);
704 }
705
706 if (!StdBadAlloc) {
707 // The "std::bad_alloc" class has not yet been declared, so build it
708 // implicitly.
709 StdBadAlloc = CXXRecordDecl::Create(Context, TagDecl::TK_class,
710 StdNamespace,
711 SourceLocation(),
712 &PP.getIdentifierTable().get("bad_alloc"),
713 SourceLocation(), 0);
714 StdBadAlloc->setImplicit(true);
715 }
716
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000717 GlobalNewDeleteDeclared = true;
718
719 QualType VoidPtr = Context.getPointerType(Context.VoidTy);
720 QualType SizeT = Context.getSizeType();
721
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000722 DeclareGlobalAllocationFunction(
723 Context.DeclarationNames.getCXXOperatorName(OO_New),
724 VoidPtr, SizeT);
725 DeclareGlobalAllocationFunction(
726 Context.DeclarationNames.getCXXOperatorName(OO_Array_New),
727 VoidPtr, SizeT);
728 DeclareGlobalAllocationFunction(
729 Context.DeclarationNames.getCXXOperatorName(OO_Delete),
730 Context.VoidTy, VoidPtr);
731 DeclareGlobalAllocationFunction(
732 Context.DeclarationNames.getCXXOperatorName(OO_Array_Delete),
733 Context.VoidTy, VoidPtr);
734}
735
736/// DeclareGlobalAllocationFunction - Declares a single implicit global
737/// allocation function if it doesn't already exist.
738void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
Mike Stump1eb44332009-09-09 15:08:12 +0000739 QualType Return, QualType Argument) {
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000740 DeclContext *GlobalCtx = Context.getTranslationUnitDecl();
741
742 // Check if this function is already declared.
Douglas Gregor6ed40e32008-12-23 21:05:05 +0000743 {
Douglas Gregor5cc37092008-12-23 22:05:29 +0000744 DeclContext::lookup_iterator Alloc, AllocEnd;
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +0000745 for (llvm::tie(Alloc, AllocEnd) = GlobalCtx->lookup(Name);
Douglas Gregor6ed40e32008-12-23 21:05:05 +0000746 Alloc != AllocEnd; ++Alloc) {
747 // FIXME: Do we need to check for default arguments here?
748 FunctionDecl *Func = cast<FunctionDecl>(*Alloc);
749 if (Func->getNumParams() == 1 &&
Ted Kremenek8189cde2009-02-07 01:47:29 +0000750 Context.getCanonicalType(Func->getParamDecl(0)->getType())==Argument)
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000751 return;
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000752 }
753 }
754
Douglas Gregor7adb10f2009-09-15 22:30:29 +0000755 QualType BadAllocType;
756 bool HasBadAllocExceptionSpec
757 = (Name.getCXXOverloadedOperator() == OO_New ||
758 Name.getCXXOverloadedOperator() == OO_Array_New);
759 if (HasBadAllocExceptionSpec) {
760 assert(StdBadAlloc && "Must have std::bad_alloc declared");
761 BadAllocType = Context.getTypeDeclType(StdBadAlloc);
762 }
763
764 QualType FnType = Context.getFunctionType(Return, &Argument, 1, false, 0,
765 true, false,
766 HasBadAllocExceptionSpec? 1 : 0,
767 &BadAllocType);
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000768 FunctionDecl *Alloc =
769 FunctionDecl::Create(Context, GlobalCtx, SourceLocation(), Name,
Argyrios Kyrtzidisa5d82002009-08-21 00:31:54 +0000770 FnType, /*DInfo=*/0, FunctionDecl::None, false, true);
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000771 Alloc->setImplicit();
772 ParmVarDecl *Param = ParmVarDecl::Create(Context, Alloc, SourceLocation(),
Argyrios Kyrtzidisa1d56622009-08-19 01:27:57 +0000773 0, Argument, /*DInfo=*/0,
774 VarDecl::None, 0);
Ted Kremenekfc767612009-01-14 00:42:25 +0000775 Alloc->setParams(Context, &Param, 1);
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000776
Douglas Gregor6ed40e32008-12-23 21:05:05 +0000777 // FIXME: Also add this declaration to the IdentifierResolver, but
778 // make sure it is at the end of the chain to coincide with the
779 // global scope.
Argyrios Kyrtzidis17945a02009-06-30 02:36:12 +0000780 ((DeclContext *)TUScope->getEntity())->addDecl(Alloc);
Sebastian Redlb5a57a62008-12-03 20:26:15 +0000781}
782
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000783/// ActOnCXXDelete - Parsed a C++ 'delete' expression (C++ 5.3.5), as in:
784/// @code ::delete ptr; @endcode
785/// or
786/// @code delete [] ptr; @endcode
Sebastian Redlf53597f2009-03-15 17:47:39 +0000787Action::OwningExprResult
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000788Sema::ActOnCXXDelete(SourceLocation StartLoc, bool UseGlobal,
Mike Stump1eb44332009-09-09 15:08:12 +0000789 bool ArrayForm, ExprArg Operand) {
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000790 // C++ [expr.delete]p1:
791 // The operand shall have a pointer type, or a class type having a single
792 // conversion function to a pointer type. The result has type void.
793 //
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000794 // DR599 amends "pointer type" to "pointer to object type" in both cases.
795
Anders Carlssond67c4c32009-08-16 20:29:29 +0000796 FunctionDecl *OperatorDelete = 0;
Mike Stump1eb44332009-09-09 15:08:12 +0000797
Sebastian Redlf53597f2009-03-15 17:47:39 +0000798 Expr *Ex = (Expr *)Operand.get();
Sebastian Redl28507842009-02-26 14:39:58 +0000799 if (!Ex->isTypeDependent()) {
800 QualType Type = Ex->getType();
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000801
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000802 if (const RecordType *Record = Type->getAs<RecordType>()) {
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000803 llvm::SmallVector<CXXConversionDecl *, 4> ObjectPtrConversions;
Fariborz Jahanian53462782009-09-11 21:44:33 +0000804 CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
805 OverloadedFunctionDecl *Conversions =
Fariborz Jahanian62509212009-09-12 18:26:03 +0000806 RD->getVisibleConversionFunctions();
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000807
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000808 for (OverloadedFunctionDecl::function_iterator
809 Func = Conversions->function_begin(),
810 FuncEnd = Conversions->function_end();
811 Func != FuncEnd; ++Func) {
812 // Skip over templated conversion functions; they aren't considered.
813 if (isa<FunctionTemplateDecl>(*Func))
814 continue;
815
816 CXXConversionDecl *Conv = cast<CXXConversionDecl>(*Func);
817
818 QualType ConvType = Conv->getConversionType().getNonReferenceType();
819 if (const PointerType *ConvPtrType = ConvType->getAs<PointerType>())
820 if (ConvPtrType->getPointeeType()->isObjectType())
Fariborz Jahanian8b915e72009-09-15 22:15:23 +0000821 ObjectPtrConversions.push_back(Conv);
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000822 }
Fariborz Jahanian8b915e72009-09-15 22:15:23 +0000823 if (ObjectPtrConversions.size() == 1) {
824 // We have a single conversion to a pointer-to-object type. Perform
825 // that conversion.
826 Operand.release();
827 if (!PerformImplicitConversion(Ex,
828 ObjectPtrConversions.front()->getConversionType(),
829 "converting")) {
830 Operand = Owned(Ex);
831 Type = Ex->getType();
832 }
833 }
834 else if (ObjectPtrConversions.size() > 1) {
835 Diag(StartLoc, diag::err_ambiguous_delete_operand)
836 << Type << Ex->getSourceRange();
837 for (unsigned i= 0; i < ObjectPtrConversions.size(); i++) {
838 CXXConversionDecl *Conv = ObjectPtrConversions[i];
839 Diag(Conv->getLocation(), diag::err_ovl_candidate);
840 }
841 return ExprError();
Douglas Gregor9cd9f3f2009-09-09 23:39:55 +0000842 }
Sebastian Redl28507842009-02-26 14:39:58 +0000843 }
844
Sebastian Redlf53597f2009-03-15 17:47:39 +0000845 if (!Type->isPointerType())
846 return ExprError(Diag(StartLoc, diag::err_delete_operand)
847 << Type << Ex->getSourceRange());
Sebastian Redl28507842009-02-26 14:39:58 +0000848
Ted Kremenek6217b802009-07-29 21:53:49 +0000849 QualType Pointee = Type->getAs<PointerType>()->getPointeeType();
Douglas Gregor8dcb29d2009-03-24 20:13:58 +0000850 if (Pointee->isFunctionType() || Pointee->isVoidType())
Sebastian Redlf53597f2009-03-15 17:47:39 +0000851 return ExprError(Diag(StartLoc, diag::err_delete_operand)
852 << Type << Ex->getSourceRange());
Douglas Gregor8dcb29d2009-03-24 20:13:58 +0000853 else if (!Pointee->isDependentType() &&
Mike Stump1eb44332009-09-09 15:08:12 +0000854 RequireCompleteType(StartLoc, Pointee,
Anders Carlssonb7906612009-08-26 23:45:07 +0000855 PDiag(diag::warn_delete_incomplete)
856 << Ex->getSourceRange()))
Douglas Gregor8dcb29d2009-03-24 20:13:58 +0000857 return ExprError();
Sebastian Redl28507842009-02-26 14:39:58 +0000858
Douglas Gregor1070c9f2009-09-29 21:38:53 +0000859 // C++ [expr.delete]p2:
860 // [Note: a pointer to a const type can be the operand of a
861 // delete-expression; it is not necessary to cast away the constness
862 // (5.2.11) of the pointer expression before it is used as the operand
863 // of the delete-expression. ]
864 ImpCastExprToType(Ex, Context.getPointerType(Context.VoidTy),
865 CastExpr::CK_NoOp);
866
867 // Update the operand.
868 Operand.take();
869 Operand = ExprArg(*this, Ex);
870
Anders Carlssond67c4c32009-08-16 20:29:29 +0000871 DeclarationName DeleteName = Context.DeclarationNames.getCXXOperatorName(
872 ArrayForm ? OO_Array_Delete : OO_Delete);
873
874 if (Pointee->isRecordType() && !UseGlobal) {
Mike Stump1eb44332009-09-09 15:08:12 +0000875 CXXRecordDecl *Record
Anders Carlssond67c4c32009-08-16 20:29:29 +0000876 = cast<CXXRecordDecl>(Pointee->getAs<RecordType>()->getDecl());
Douglas Gregor90916562009-09-29 18:16:17 +0000877
878 // Try to find operator delete/operator delete[] in class scope.
John McCallf36e02d2009-10-09 21:13:30 +0000879 LookupResult Found;
880 LookupQualifiedName(Found, Record, DeleteName, LookupOrdinaryName);
Douglas Gregor90916562009-09-29 18:16:17 +0000881 // FIXME: Diagnose ambiguity properly
882 assert(!Found.isAmbiguous() && "Ambiguous delete/delete[] not handled");
883 for (LookupResult::iterator F = Found.begin(), FEnd = Found.end();
884 F != FEnd; ++F) {
885 if (CXXMethodDecl *Delete = dyn_cast<CXXMethodDecl>(*F))
886 if (Delete->isUsualDeallocationFunction()) {
887 OperatorDelete = Delete;
888 break;
889 }
890 }
891
Fariborz Jahanian34374e62009-09-03 23:18:17 +0000892 if (!Record->hasTrivialDestructor())
893 if (const CXXDestructorDecl *Dtor = Record->getDestructor(Context))
Mike Stump1eb44332009-09-09 15:08:12 +0000894 MarkDeclarationReferenced(StartLoc,
Fariborz Jahanian34374e62009-09-03 23:18:17 +0000895 const_cast<CXXDestructorDecl*>(Dtor));
Anders Carlssond67c4c32009-08-16 20:29:29 +0000896 }
Mike Stump1eb44332009-09-09 15:08:12 +0000897
Anders Carlssond67c4c32009-08-16 20:29:29 +0000898 if (!OperatorDelete) {
899 // Didn't find a member overload. Look for a global one.
900 DeclareGlobalNewDelete();
901 DeclContext *TUDecl = Context.getTranslationUnitDecl();
Mike Stump1eb44332009-09-09 15:08:12 +0000902 if (FindAllocationOverload(StartLoc, SourceRange(), DeleteName,
Douglas Gregor90916562009-09-29 18:16:17 +0000903 &Ex, 1, TUDecl, /*AllowMissing=*/false,
Anders Carlssond67c4c32009-08-16 20:29:29 +0000904 OperatorDelete))
905 return ExprError();
906 }
Mike Stump1eb44332009-09-09 15:08:12 +0000907
Sebastian Redl28507842009-02-26 14:39:58 +0000908 // FIXME: Check access and ambiguity of operator delete and destructor.
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000909 }
910
Sebastian Redlf53597f2009-03-15 17:47:39 +0000911 Operand.release();
912 return Owned(new (Context) CXXDeleteExpr(Context.VoidTy, UseGlobal, ArrayForm,
Anders Carlssond67c4c32009-08-16 20:29:29 +0000913 OperatorDelete, Ex, StartLoc));
Sebastian Redl4c5d3202008-11-21 19:14:01 +0000914}
915
916
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000917/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a
918/// C++ if/switch/while/for statement.
919/// e.g: "if (int x = f()) {...}"
Sebastian Redlf53597f2009-03-15 17:47:39 +0000920Action::OwningExprResult
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000921Sema::ActOnCXXConditionDeclarationExpr(Scope *S, SourceLocation StartLoc,
922 Declarator &D,
923 SourceLocation EqualLoc,
Sebastian Redlf53597f2009-03-15 17:47:39 +0000924 ExprArg AssignExprVal) {
925 assert(AssignExprVal.get() && "Null assignment expression");
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000926
927 // C++ 6.4p2:
928 // The declarator shall not specify a function or an array.
929 // The type-specifier-seq shall not contain typedef and shall not declare a
930 // new class or enumeration.
931
932 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
933 "Parser allowed 'typedef' as storage class of condition decl.");
934
Argyrios Kyrtzidisa1d56622009-08-19 01:27:57 +0000935 // FIXME: Store DeclaratorInfo in the expression.
936 DeclaratorInfo *DInfo = 0;
Argyrios Kyrtzidise955e722009-08-11 05:20:41 +0000937 TagDecl *OwnedTag = 0;
Argyrios Kyrtzidisa1d56622009-08-19 01:27:57 +0000938 QualType Ty = GetTypeForDeclarator(D, S, &DInfo, /*Skip=*/0, &OwnedTag);
Mike Stump1eb44332009-09-09 15:08:12 +0000939
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000940 if (Ty->isFunctionType()) { // The declarator shall not specify a function...
941 // We exit without creating a CXXConditionDeclExpr because a FunctionDecl
942 // would be created and CXXConditionDeclExpr wants a VarDecl.
Sebastian Redlf53597f2009-03-15 17:47:39 +0000943 return ExprError(Diag(StartLoc, diag::err_invalid_use_of_function_type)
944 << SourceRange(StartLoc, EqualLoc));
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000945 } else if (Ty->isArrayType()) { // ...or an array.
Chris Lattnerdcd5ef12008-11-19 05:27:50 +0000946 Diag(StartLoc, diag::err_invalid_use_of_array_type)
947 << SourceRange(StartLoc, EqualLoc);
Argyrios Kyrtzidise955e722009-08-11 05:20:41 +0000948 } else if (OwnedTag && OwnedTag->isDefinition()) {
949 // The type-specifier-seq shall not declare a new class or enumeration.
950 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_condition);
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000951 }
952
Douglas Gregor2e01cda2009-06-23 21:43:56 +0000953 DeclPtrTy Dcl = ActOnDeclarator(S, D);
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000954 if (!Dcl)
Sebastian Redlf53597f2009-03-15 17:47:39 +0000955 return ExprError();
Anders Carlssonf5dcd382009-05-30 21:37:25 +0000956 AddInitializerToDecl(Dcl, move(AssignExprVal), /*DirectInit=*/false);
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000957
Douglas Gregorcaaf29a2008-12-10 23:01:14 +0000958 // Mark this variable as one that is declared within a conditional.
Chris Lattnerb28317a2009-03-28 19:18:32 +0000959 // We know that the decl had to be a VarDecl because that is the only type of
960 // decl that can be assigned and the grammar requires an '='.
961 VarDecl *VD = cast<VarDecl>(Dcl.getAs<Decl>());
962 VD->setDeclaredInCondition(true);
963 return Owned(new (Context) CXXConditionDeclExpr(StartLoc, EqualLoc, VD));
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000964}
965
966/// CheckCXXBooleanCondition - Returns true if a conversion to bool is invalid.
967bool Sema::CheckCXXBooleanCondition(Expr *&CondExpr) {
968 // C++ 6.4p4:
969 // The value of a condition that is an initialized declaration in a statement
970 // other than a switch statement is the value of the declared variable
971 // implicitly converted to type bool. If that conversion is ill-formed, the
972 // program is ill-formed.
973 // The value of a condition that is an expression is the value of the
974 // expression, implicitly converted to bool.
975 //
Douglas Gregor09f41cf2009-01-14 15:45:31 +0000976 return PerformContextuallyConvertToBool(CondExpr);
Argyrios Kyrtzidis59210932008-09-10 02:17:11 +0000977}
Douglas Gregor77a52232008-09-12 00:47:35 +0000978
979/// Helper function to determine whether this is the (deprecated) C++
980/// conversion from a string literal to a pointer to non-const char or
981/// non-const wchar_t (for narrow and wide string literals,
982/// respectively).
Mike Stump1eb44332009-09-09 15:08:12 +0000983bool
Douglas Gregor77a52232008-09-12 00:47:35 +0000984Sema::IsStringLiteralToNonConstPointerConversion(Expr *From, QualType ToType) {
985 // Look inside the implicit cast, if it exists.
986 if (ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(From))
987 From = Cast->getSubExpr();
988
989 // A string literal (2.13.4) that is not a wide string literal can
990 // be converted to an rvalue of type "pointer to char"; a wide
991 // string literal can be converted to an rvalue of type "pointer
992 // to wchar_t" (C++ 4.2p2).
993 if (StringLiteral *StrLit = dyn_cast<StringLiteral>(From))
Ted Kremenek6217b802009-07-29 21:53:49 +0000994 if (const PointerType *ToPtrType = ToType->getAs<PointerType>())
Mike Stump1eb44332009-09-09 15:08:12 +0000995 if (const BuiltinType *ToPointeeType
John McCall183700f2009-09-21 23:43:11 +0000996 = ToPtrType->getPointeeType()->getAs<BuiltinType>()) {
Douglas Gregor77a52232008-09-12 00:47:35 +0000997 // This conversion is considered only when there is an
998 // explicit appropriate pointer target type (C++ 4.2p2).
John McCall0953e762009-09-24 19:53:00 +0000999 if (!ToPtrType->getPointeeType().hasQualifiers() &&
Douglas Gregor77a52232008-09-12 00:47:35 +00001000 ((StrLit->isWide() && ToPointeeType->isWideCharType()) ||
1001 (!StrLit->isWide() &&
1002 (ToPointeeType->getKind() == BuiltinType::Char_U ||
1003 ToPointeeType->getKind() == BuiltinType::Char_S))))
1004 return true;
1005 }
1006
1007 return false;
1008}
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001009
1010/// PerformImplicitConversion - Perform an implicit conversion of the
1011/// expression From to the type ToType. Returns true if there was an
1012/// error, false otherwise. The expression From is replaced with the
Douglas Gregor45920e82008-12-19 17:40:08 +00001013/// converted expression. Flavor is the kind of conversion we're
Douglas Gregor09f41cf2009-01-14 15:45:31 +00001014/// performing, used in the error message. If @p AllowExplicit,
Sebastian Redle2b68332009-04-12 17:16:29 +00001015/// explicit user-defined conversions are permitted. @p Elidable should be true
1016/// when called for copies which may be elided (C++ 12.8p15). C++0x overload
1017/// resolution works differently in that case.
1018bool
Douglas Gregor45920e82008-12-19 17:40:08 +00001019Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
Sebastian Redle2b68332009-04-12 17:16:29 +00001020 const char *Flavor, bool AllowExplicit,
Mike Stump1eb44332009-09-09 15:08:12 +00001021 bool Elidable) {
Sebastian Redle2b68332009-04-12 17:16:29 +00001022 ImplicitConversionSequence ICS;
Fariborz Jahanian51bebc82009-09-23 20:55:32 +00001023 return PerformImplicitConversion(From, ToType, Flavor, AllowExplicit,
1024 Elidable, ICS);
1025}
1026
1027bool
1028Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
1029 const char *Flavor, bool AllowExplicit,
1030 bool Elidable,
1031 ImplicitConversionSequence& ICS) {
Sebastian Redle2b68332009-04-12 17:16:29 +00001032 ICS.ConversionKind = ImplicitConversionSequence::BadConversion;
1033 if (Elidable && getLangOptions().CPlusPlus0x) {
Mike Stump1eb44332009-09-09 15:08:12 +00001034 ICS = TryImplicitConversion(From, ToType,
Anders Carlssonda7a18b2009-08-27 17:24:15 +00001035 /*SuppressUserConversions=*/false,
Mike Stump1eb44332009-09-09 15:08:12 +00001036 AllowExplicit,
Anders Carlsson08972922009-08-28 15:33:32 +00001037 /*ForceRValue=*/true,
1038 /*InOverloadResolution=*/false);
Sebastian Redle2b68332009-04-12 17:16:29 +00001039 }
1040 if (ICS.ConversionKind == ImplicitConversionSequence::BadConversion) {
Mike Stump1eb44332009-09-09 15:08:12 +00001041 ICS = TryImplicitConversion(From, ToType,
Anders Carlssonda7a18b2009-08-27 17:24:15 +00001042 /*SuppressUserConversions=*/false,
1043 AllowExplicit,
Anders Carlsson08972922009-08-28 15:33:32 +00001044 /*ForceRValue=*/false,
1045 /*InOverloadResolution=*/false);
Sebastian Redle2b68332009-04-12 17:16:29 +00001046 }
Douglas Gregor09f41cf2009-01-14 15:45:31 +00001047 return PerformImplicitConversion(From, ToType, ICS, Flavor);
1048}
1049
Fariborz Jahanian93034ca2009-10-16 19:20:59 +00001050/// BuildCXXDerivedToBaseExpr - This routine generates the suitable AST
1051/// for the derived to base conversion of the expression 'From'. All
1052/// necessary information is passed in ICS.
1053bool
1054Sema::BuildCXXDerivedToBaseExpr(Expr *&From, CastExpr::CastKind CastKind,
1055 const ImplicitConversionSequence& ICS,
1056 const char *Flavor) {
1057 QualType BaseType =
1058 QualType::getFromOpaquePtr(ICS.UserDefined.After.ToTypePtr);
1059 // Must do additional defined to base conversion.
1060 QualType DerivedType =
1061 QualType::getFromOpaquePtr(ICS.UserDefined.After.FromTypePtr);
1062
1063 From = new (Context) ImplicitCastExpr(
1064 DerivedType.getNonReferenceType(),
1065 CastKind,
1066 From,
1067 DerivedType->isLValueReferenceType());
1068 From = new (Context) ImplicitCastExpr(BaseType.getNonReferenceType(),
1069 CastExpr::CK_DerivedToBase, From,
1070 BaseType->isLValueReferenceType());
1071 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
1072 OwningExprResult FromResult =
1073 BuildCXXConstructExpr(
1074 ICS.UserDefined.After.CopyConstructor->getLocation(),
1075 BaseType,
1076 ICS.UserDefined.After.CopyConstructor,
1077 MultiExprArg(*this, (void **)&From, 1));
1078 if (FromResult.isInvalid())
1079 return true;
1080 From = FromResult.takeAs<Expr>();
1081 return false;
1082}
1083
Douglas Gregor09f41cf2009-01-14 15:45:31 +00001084/// PerformImplicitConversion - Perform an implicit conversion of the
1085/// expression From to the type ToType using the pre-computed implicit
1086/// conversion sequence ICS. Returns true if there was an error, false
1087/// otherwise. The expression From is replaced with the converted
1088/// expression. Flavor is the kind of conversion we're performing,
1089/// used in the error message.
1090bool
1091Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
1092 const ImplicitConversionSequence &ICS,
1093 const char* Flavor) {
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001094 switch (ICS.ConversionKind) {
1095 case ImplicitConversionSequence::StandardConversion:
Douglas Gregor45920e82008-12-19 17:40:08 +00001096 if (PerformImplicitConversion(From, ToType, ICS.Standard, Flavor))
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001097 return true;
1098 break;
1099
Anders Carlssonf6c213a2009-09-15 06:28:28 +00001100 case ImplicitConversionSequence::UserDefinedConversion: {
1101
Fariborz Jahanian7fe5d722009-08-28 22:04:50 +00001102 FunctionDecl *FD = ICS.UserDefined.ConversionFunction;
1103 CastExpr::CastKind CastKind = CastExpr::CK_Unknown;
Anders Carlssonf6c213a2009-09-15 06:28:28 +00001104 QualType BeforeToType;
1105 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(FD)) {
Fariborz Jahanian7fe5d722009-08-28 22:04:50 +00001106 CastKind = CastExpr::CK_UserDefinedConversion;
Anders Carlssonf6c213a2009-09-15 06:28:28 +00001107
1108 // If the user-defined conversion is specified by a conversion function,
1109 // the initial standard conversion sequence converts the source type to
1110 // the implicit object parameter of the conversion function.
1111 BeforeToType = Context.getTagDeclType(Conv->getParent());
1112 } else if (const CXXConstructorDecl *Ctor =
1113 dyn_cast<CXXConstructorDecl>(FD)) {
Anders Carlsson0aebc812009-09-09 21:33:21 +00001114 CastKind = CastExpr::CK_ConstructorConversion;
Anders Carlssonf6c213a2009-09-15 06:28:28 +00001115
1116 // If the user-defined conversion is specified by a constructor, the
1117 // initial standard conversion sequence converts the source type to the
1118 // type required by the argument of the constructor
1119 BeforeToType = Ctor->getParamDecl(0)->getType();
1120 }
Anders Carlsson0aebc812009-09-09 21:33:21 +00001121 else
1122 assert(0 && "Unknown conversion function kind!");
1123
Anders Carlssonf6c213a2009-09-15 06:28:28 +00001124 if (PerformImplicitConversion(From, BeforeToType,
1125 ICS.UserDefined.Before, "converting"))
1126 return true;
1127
Anders Carlsson0aebc812009-09-09 21:33:21 +00001128 OwningExprResult CastArg
1129 = BuildCXXCastArgument(From->getLocStart(),
1130 ToType.getNonReferenceType(),
1131 CastKind, cast<CXXMethodDecl>(FD),
1132 Owned(From));
1133
1134 if (CastArg.isInvalid())
1135 return true;
Fariborz Jahanian93034ca2009-10-16 19:20:59 +00001136
1137 if (ICS.UserDefined.After.Second == ICK_Derived_To_Base &&
1138 ICS.UserDefined.After.CopyConstructor) {
1139 From = CastArg.takeAs<Expr>();
1140 return BuildCXXDerivedToBaseExpr(From, CastKind, ICS, Flavor);
1141 }
Anders Carlsson0aebc812009-09-09 21:33:21 +00001142
Anders Carlsson626c2d62009-09-15 05:49:31 +00001143 From = new (Context) ImplicitCastExpr(ToType.getNonReferenceType(),
Fariborz Jahanian93034ca2009-10-16 19:20:59 +00001144 CastKind, CastArg.takeAs<Expr>(),
Anders Carlsson626c2d62009-09-15 05:49:31 +00001145 ToType->isLValueReferenceType());
Fariborz Jahanian7fe5d722009-08-28 22:04:50 +00001146 return false;
Fariborz Jahanian93034ca2009-10-16 19:20:59 +00001147 }
1148
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001149 case ImplicitConversionSequence::EllipsisConversion:
1150 assert(false && "Cannot perform an ellipsis conversion");
Douglas Gregor60d62c22008-10-31 16:23:19 +00001151 return false;
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001152
1153 case ImplicitConversionSequence::BadConversion:
1154 return true;
1155 }
1156
1157 // Everything went well.
1158 return false;
1159}
1160
1161/// PerformImplicitConversion - Perform an implicit conversion of the
1162/// expression From to the type ToType by following the standard
1163/// conversion sequence SCS. Returns true if there was an error, false
1164/// otherwise. The expression From is replaced with the converted
Douglas Gregor45920e82008-12-19 17:40:08 +00001165/// expression. Flavor is the context in which we're performing this
1166/// conversion, for use in error messages.
Mike Stump1eb44332009-09-09 15:08:12 +00001167bool
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001168Sema::PerformImplicitConversion(Expr *&From, QualType ToType,
Douglas Gregor45920e82008-12-19 17:40:08 +00001169 const StandardConversionSequence& SCS,
Douglas Gregor09f41cf2009-01-14 15:45:31 +00001170 const char *Flavor) {
Mike Stump390b4cc2009-05-16 07:39:55 +00001171 // Overall FIXME: we are recomputing too many types here and doing far too
1172 // much extra work. What this means is that we need to keep track of more
1173 // information that is computed when we try the implicit conversion initially,
1174 // so that we don't need to recompute anything here.
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001175 QualType FromType = From->getType();
1176
Douglas Gregor225c41e2008-11-03 19:09:14 +00001177 if (SCS.CopyConstructor) {
Anders Carlsson7c3e8a12009-05-19 04:45:15 +00001178 // FIXME: When can ToType be a reference type?
1179 assert(!ToType->isReferenceType());
Fariborz Jahanianb3c47742009-09-25 18:59:21 +00001180 if (SCS.Second == ICK_Derived_To_Base) {
1181 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
1182 if (CompleteConstructorCall(cast<CXXConstructorDecl>(SCS.CopyConstructor),
1183 MultiExprArg(*this, (void **)&From, 1),
1184 /*FIXME:ConstructLoc*/SourceLocation(),
1185 ConstructorArgs))
1186 return true;
1187 OwningExprResult FromResult =
1188 BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
1189 ToType, SCS.CopyConstructor,
1190 move_arg(ConstructorArgs));
1191 if (FromResult.isInvalid())
1192 return true;
1193 From = FromResult.takeAs<Expr>();
1194 return false;
1195 }
Mike Stump1eb44332009-09-09 15:08:12 +00001196 OwningExprResult FromResult =
1197 BuildCXXConstructExpr(/*FIXME:ConstructLoc*/SourceLocation(),
1198 ToType, SCS.CopyConstructor,
Anders Carlssonf47511a2009-09-07 22:23:31 +00001199 MultiExprArg(*this, (void**)&From, 1));
Mike Stump1eb44332009-09-09 15:08:12 +00001200
Anders Carlssonda3f4e22009-08-25 05:12:04 +00001201 if (FromResult.isInvalid())
1202 return true;
Mike Stump1eb44332009-09-09 15:08:12 +00001203
Anders Carlssonda3f4e22009-08-25 05:12:04 +00001204 From = FromResult.takeAs<Expr>();
Douglas Gregor225c41e2008-11-03 19:09:14 +00001205 return false;
1206 }
1207
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001208 // Perform the first implicit conversion.
1209 switch (SCS.First) {
1210 case ICK_Identity:
1211 case ICK_Lvalue_To_Rvalue:
1212 // Nothing to do.
1213 break;
1214
1215 case ICK_Array_To_Pointer:
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001216 FromType = Context.getArrayDecayedType(FromType);
Anders Carlsson82495762009-08-08 21:04:35 +00001217 ImpCastExprToType(From, FromType, CastExpr::CK_ArrayToPointerDecay);
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001218 break;
1219
1220 case ICK_Function_To_Pointer:
Douglas Gregor063daf62009-03-13 18:40:31 +00001221 if (Context.getCanonicalType(FromType) == Context.OverloadTy) {
Douglas Gregor904eed32008-11-10 20:40:00 +00001222 FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(From, ToType, true);
1223 if (!Fn)
1224 return true;
1225
Douglas Gregor48f3bb92009-02-18 21:56:37 +00001226 if (DiagnoseUseOfDecl(Fn, From->getSourceRange().getBegin()))
1227 return true;
1228
Sebastian Redl759986e2009-10-17 20:50:27 +00001229 bool WasAddrOf = FixOverloadedFunctionReference(From, Fn);
Douglas Gregor904eed32008-11-10 20:40:00 +00001230 FromType = From->getType();
Sebastian Redl759986e2009-10-17 20:50:27 +00001231 // If there's already an address-of operator in the expression, we have
1232 // the right type already, and the code below would just introduce an
1233 // invalid additional pointer level.
1234 if (WasAddrOf)
1235 break;
Douglas Gregor904eed32008-11-10 20:40:00 +00001236 }
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001237 FromType = Context.getPointerType(FromType);
Anders Carlssonb633c4e2009-09-01 20:37:18 +00001238 ImpCastExprToType(From, FromType, CastExpr::CK_FunctionToPointerDecay);
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001239 break;
1240
1241 default:
1242 assert(false && "Improper first standard conversion");
1243 break;
1244 }
1245
1246 // Perform the second implicit conversion
1247 switch (SCS.Second) {
1248 case ICK_Identity:
Sebastian Redl2c7588f2009-10-10 12:04:10 +00001249 // If both sides are functions (or pointers/references to them), there could
1250 // be incompatible exception declarations.
1251 if (CheckExceptionSpecCompatibility(From, ToType))
1252 return true;
1253 // Nothing else to do.
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001254 break;
1255
1256 case ICK_Integral_Promotion:
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001257 case ICK_Integral_Conversion:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001258 ImpCastExprToType(From, ToType, CastExpr::CK_IntegralCast);
1259 break;
1260
1261 case ICK_Floating_Promotion:
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001262 case ICK_Floating_Conversion:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001263 ImpCastExprToType(From, ToType, CastExpr::CK_FloatingCast);
1264 break;
1265
1266 case ICK_Complex_Promotion:
Douglas Gregor5cdf8212009-02-12 00:15:05 +00001267 case ICK_Complex_Conversion:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001268 ImpCastExprToType(From, ToType, CastExpr::CK_Unknown);
1269 break;
1270
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001271 case ICK_Floating_Integral:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001272 if (ToType->isFloatingType())
1273 ImpCastExprToType(From, ToType, CastExpr::CK_IntegralToFloating);
1274 else
1275 ImpCastExprToType(From, ToType, CastExpr::CK_FloatingToIntegral);
1276 break;
1277
Douglas Gregor5cdf8212009-02-12 00:15:05 +00001278 case ICK_Complex_Real:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001279 ImpCastExprToType(From, ToType, CastExpr::CK_Unknown);
1280 break;
1281
Douglas Gregorf9201e02009-02-11 23:02:49 +00001282 case ICK_Compatible_Conversion:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001283 ImpCastExprToType(From, ToType, CastExpr::CK_NoOp);
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001284 break;
1285
Anders Carlsson61faec12009-09-12 04:46:44 +00001286 case ICK_Pointer_Conversion: {
Douglas Gregor45920e82008-12-19 17:40:08 +00001287 if (SCS.IncompatibleObjC) {
1288 // Diagnose incompatible Objective-C conversions
Mike Stump1eb44332009-09-09 15:08:12 +00001289 Diag(From->getSourceRange().getBegin(),
Douglas Gregor45920e82008-12-19 17:40:08 +00001290 diag::ext_typecheck_convert_incompatible_pointer)
1291 << From->getType() << ToType << Flavor
1292 << From->getSourceRange();
1293 }
1294
Anders Carlsson61faec12009-09-12 04:46:44 +00001295
1296 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
1297 if (CheckPointerConversion(From, ToType, Kind))
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001298 return true;
Anders Carlsson61faec12009-09-12 04:46:44 +00001299 ImpCastExprToType(From, ToType, Kind);
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001300 break;
Anders Carlsson61faec12009-09-12 04:46:44 +00001301 }
1302
1303 case ICK_Pointer_Member: {
1304 CastExpr::CastKind Kind = CastExpr::CK_Unknown;
1305 if (CheckMemberPointerConversion(From, ToType, Kind))
1306 return true;
Sebastian Redl2c7588f2009-10-10 12:04:10 +00001307 if (CheckExceptionSpecCompatibility(From, ToType))
1308 return true;
Anders Carlsson61faec12009-09-12 04:46:44 +00001309 ImpCastExprToType(From, ToType, Kind);
1310 break;
1311 }
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001312 case ICK_Boolean_Conversion:
Eli Friedman73c39ab2009-10-20 08:27:19 +00001313 ImpCastExprToType(From, Context.BoolTy, CastExpr::CK_Unknown);
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001314 break;
1315
1316 default:
1317 assert(false && "Improper second standard conversion");
1318 break;
1319 }
1320
1321 switch (SCS.Third) {
1322 case ICK_Identity:
1323 // Nothing to do.
1324 break;
1325
1326 case ICK_Qualification:
Mike Stump390b4cc2009-05-16 07:39:55 +00001327 // FIXME: Not sure about lvalue vs rvalue here in the presence of rvalue
1328 // references.
Mike Stump1eb44332009-09-09 15:08:12 +00001329 ImpCastExprToType(From, ToType.getNonReferenceType(),
Eli Friedman73c39ab2009-10-20 08:27:19 +00001330 CastExpr::CK_NoOp,
Sebastian Redl7c80bd62009-03-16 23:22:08 +00001331 ToType->isLValueReferenceType());
Douglas Gregor94b1dd22008-10-24 04:54:22 +00001332 break;
1333
1334 default:
1335 assert(false && "Improper second standard conversion");
1336 break;
1337 }
1338
1339 return false;
1340}
1341
Sebastian Redl64b45f72009-01-05 20:52:13 +00001342Sema::OwningExprResult Sema::ActOnUnaryTypeTrait(UnaryTypeTrait OTT,
1343 SourceLocation KWLoc,
1344 SourceLocation LParen,
1345 TypeTy *Ty,
1346 SourceLocation RParen) {
Argyrios Kyrtzidise8661902009-08-19 01:28:28 +00001347 QualType T = GetTypeFromParser(Ty);
Mike Stump1eb44332009-09-09 15:08:12 +00001348
Anders Carlsson3292d5c2009-07-07 19:06:02 +00001349 // According to http://gcc.gnu.org/onlinedocs/gcc/Type-Traits.html
1350 // all traits except __is_class, __is_enum and __is_union require a the type
1351 // to be complete.
1352 if (OTT != UTT_IsClass && OTT != UTT_IsEnum && OTT != UTT_IsUnion) {
Mike Stump1eb44332009-09-09 15:08:12 +00001353 if (RequireCompleteType(KWLoc, T,
Anders Carlssond497ba72009-08-26 22:59:12 +00001354 diag::err_incomplete_type_used_in_type_trait_expr))
Anders Carlsson3292d5c2009-07-07 19:06:02 +00001355 return ExprError();
1356 }
Sebastian Redl64b45f72009-01-05 20:52:13 +00001357
1358 // There is no point in eagerly computing the value. The traits are designed
1359 // to be used from type trait templates, so Ty will be a template parameter
1360 // 99% of the time.
Anders Carlsson3292d5c2009-07-07 19:06:02 +00001361 return Owned(new (Context) UnaryTypeTraitExpr(KWLoc, OTT, T,
1362 RParen, Context.BoolTy));
Sebastian Redl64b45f72009-01-05 20:52:13 +00001363}
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001364
1365QualType Sema::CheckPointerToMemberOperands(
Mike Stump1eb44332009-09-09 15:08:12 +00001366 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isIndirect) {
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001367 const char *OpSpelling = isIndirect ? "->*" : ".*";
1368 // C++ 5.5p2
1369 // The binary operator .* [p3: ->*] binds its second operand, which shall
1370 // be of type "pointer to member of T" (where T is a completely-defined
1371 // class type) [...]
1372 QualType RType = rex->getType();
Ted Kremenek6217b802009-07-29 21:53:49 +00001373 const MemberPointerType *MemPtr = RType->getAs<MemberPointerType>();
Douglas Gregore7450f52009-03-24 19:52:54 +00001374 if (!MemPtr) {
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001375 Diag(Loc, diag::err_bad_memptr_rhs)
1376 << OpSpelling << RType << rex->getSourceRange();
1377 return QualType();
Mike Stump1eb44332009-09-09 15:08:12 +00001378 }
Douglas Gregore7450f52009-03-24 19:52:54 +00001379
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001380 QualType Class(MemPtr->getClass(), 0);
1381
1382 // C++ 5.5p2
1383 // [...] to its first operand, which shall be of class T or of a class of
1384 // which T is an unambiguous and accessible base class. [p3: a pointer to
1385 // such a class]
1386 QualType LType = lex->getType();
1387 if (isIndirect) {
Ted Kremenek6217b802009-07-29 21:53:49 +00001388 if (const PointerType *Ptr = LType->getAs<PointerType>())
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001389 LType = Ptr->getPointeeType().getNonReferenceType();
1390 else {
1391 Diag(Loc, diag::err_bad_memptr_lhs)
1392 << OpSpelling << 1 << LType << lex->getSourceRange();
1393 return QualType();
1394 }
1395 }
1396
1397 if (Context.getCanonicalType(Class).getUnqualifiedType() !=
1398 Context.getCanonicalType(LType).getUnqualifiedType()) {
Douglas Gregora8f32e02009-10-06 17:59:45 +00001399 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/false,
1400 /*DetectVirtual=*/false);
Mike Stump390b4cc2009-05-16 07:39:55 +00001401 // FIXME: Would it be useful to print full ambiguity paths, or is that
1402 // overkill?
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001403 if (!IsDerivedFrom(LType, Class, Paths) ||
1404 Paths.isAmbiguous(Context.getCanonicalType(Class))) {
1405 Diag(Loc, diag::err_bad_memptr_lhs) << OpSpelling
1406 << (int)isIndirect << lex->getType() << lex->getSourceRange();
1407 return QualType();
1408 }
1409 }
1410
1411 // C++ 5.5p2
1412 // The result is an object or a function of the type specified by the
1413 // second operand.
1414 // The cv qualifiers are the union of those in the pointer and the left side,
1415 // in accordance with 5.5p5 and 5.2.5.
1416 // FIXME: This returns a dereferenced member function pointer as a normal
1417 // function type. However, the only operation valid on such functions is
Mike Stump390b4cc2009-05-16 07:39:55 +00001418 // calling them. There's also a GCC extension to get a function pointer to the
1419 // thing, which is another complication, because this type - unlike the type
1420 // that is the result of this expression - takes the class as the first
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001421 // argument.
1422 // We probably need a "MemberFunctionClosureType" or something like that.
1423 QualType Result = MemPtr->getPointeeType();
John McCall0953e762009-09-24 19:53:00 +00001424 Result = Context.getCVRQualifiedType(Result, LType.getCVRQualifiers());
Sebastian Redl7c8bd602009-02-07 20:10:22 +00001425 return Result;
1426}
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001427
1428/// \brief Get the target type of a standard or user-defined conversion.
1429static QualType TargetType(const ImplicitConversionSequence &ICS) {
1430 assert((ICS.ConversionKind ==
1431 ImplicitConversionSequence::StandardConversion ||
1432 ICS.ConversionKind ==
1433 ImplicitConversionSequence::UserDefinedConversion) &&
1434 "function only valid for standard or user-defined conversions");
1435 if (ICS.ConversionKind == ImplicitConversionSequence::StandardConversion)
1436 return QualType::getFromOpaquePtr(ICS.Standard.ToTypePtr);
1437 return QualType::getFromOpaquePtr(ICS.UserDefined.After.ToTypePtr);
1438}
1439
1440/// \brief Try to convert a type to another according to C++0x 5.16p3.
1441///
1442/// This is part of the parameter validation for the ? operator. If either
1443/// value operand is a class type, the two operands are attempted to be
1444/// converted to each other. This function does the conversion in one direction.
1445/// It emits a diagnostic and returns true only if it finds an ambiguous
1446/// conversion.
1447static bool TryClassUnification(Sema &Self, Expr *From, Expr *To,
1448 SourceLocation QuestionLoc,
Mike Stump1eb44332009-09-09 15:08:12 +00001449 ImplicitConversionSequence &ICS) {
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001450 // C++0x 5.16p3
1451 // The process for determining whether an operand expression E1 of type T1
1452 // can be converted to match an operand expression E2 of type T2 is defined
1453 // as follows:
1454 // -- If E2 is an lvalue:
1455 if (To->isLvalue(Self.Context) == Expr::LV_Valid) {
1456 // E1 can be converted to match E2 if E1 can be implicitly converted to
1457 // type "lvalue reference to T2", subject to the constraint that in the
1458 // conversion the reference must bind directly to E1.
1459 if (!Self.CheckReferenceInit(From,
1460 Self.Context.getLValueReferenceType(To->getType()),
Douglas Gregor739d8282009-09-23 23:04:10 +00001461 To->getLocStart(),
Anders Carlsson2de3ace2009-08-27 17:30:43 +00001462 /*SuppressUserConversions=*/false,
1463 /*AllowExplicit=*/false,
1464 /*ForceRValue=*/false,
1465 &ICS))
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001466 {
1467 assert((ICS.ConversionKind ==
1468 ImplicitConversionSequence::StandardConversion ||
1469 ICS.ConversionKind ==
1470 ImplicitConversionSequence::UserDefinedConversion) &&
1471 "expected a definite conversion");
1472 bool DirectBinding =
1473 ICS.ConversionKind == ImplicitConversionSequence::StandardConversion ?
1474 ICS.Standard.DirectBinding : ICS.UserDefined.After.DirectBinding;
1475 if (DirectBinding)
1476 return false;
1477 }
1478 }
1479 ICS.ConversionKind = ImplicitConversionSequence::BadConversion;
1480 // -- If E2 is an rvalue, or if the conversion above cannot be done:
1481 // -- if E1 and E2 have class type, and the underlying class types are
1482 // the same or one is a base class of the other:
1483 QualType FTy = From->getType();
1484 QualType TTy = To->getType();
Ted Kremenek6217b802009-07-29 21:53:49 +00001485 const RecordType *FRec = FTy->getAs<RecordType>();
1486 const RecordType *TRec = TTy->getAs<RecordType>();
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001487 bool FDerivedFromT = FRec && TRec && Self.IsDerivedFrom(FTy, TTy);
1488 if (FRec && TRec && (FRec == TRec ||
1489 FDerivedFromT || Self.IsDerivedFrom(TTy, FTy))) {
1490 // E1 can be converted to match E2 if the class of T2 is the
1491 // same type as, or a base class of, the class of T1, and
1492 // [cv2 > cv1].
1493 if ((FRec == TRec || FDerivedFromT) && TTy.isAtLeastAsQualifiedAs(FTy)) {
1494 // Could still fail if there's no copy constructor.
1495 // FIXME: Is this a hard error then, or just a conversion failure? The
1496 // standard doesn't say.
Mike Stump1eb44332009-09-09 15:08:12 +00001497 ICS = Self.TryCopyInitialization(From, TTy,
Anders Carlssond28b4282009-08-27 17:18:13 +00001498 /*SuppressUserConversions=*/false,
Anders Carlsson7b361b52009-08-27 17:37:39 +00001499 /*ForceRValue=*/false,
1500 /*InOverloadResolution=*/false);
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001501 }
1502 } else {
1503 // -- Otherwise: E1 can be converted to match E2 if E1 can be
1504 // implicitly converted to the type that expression E2 would have
1505 // if E2 were converted to an rvalue.
1506 // First find the decayed type.
1507 if (TTy->isFunctionType())
1508 TTy = Self.Context.getPointerType(TTy);
Mike Stump1eb44332009-09-09 15:08:12 +00001509 else if (TTy->isArrayType())
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001510 TTy = Self.Context.getArrayDecayedType(TTy);
1511
1512 // Now try the implicit conversion.
1513 // FIXME: This doesn't detect ambiguities.
Anders Carlssonda7a18b2009-08-27 17:24:15 +00001514 ICS = Self.TryImplicitConversion(From, TTy,
1515 /*SuppressUserConversions=*/false,
1516 /*AllowExplicit=*/false,
Anders Carlsson08972922009-08-28 15:33:32 +00001517 /*ForceRValue=*/false,
1518 /*InOverloadResolution=*/false);
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001519 }
1520 return false;
1521}
1522
1523/// \brief Try to find a common type for two according to C++0x 5.16p5.
1524///
1525/// This is part of the parameter validation for the ? operator. If either
1526/// value operand is a class type, overload resolution is used to find a
1527/// conversion to a common type.
1528static bool FindConditionalOverload(Sema &Self, Expr *&LHS, Expr *&RHS,
1529 SourceLocation Loc) {
1530 Expr *Args[2] = { LHS, RHS };
1531 OverloadCandidateSet CandidateSet;
1532 Self.AddBuiltinOperatorCandidates(OO_Conditional, Args, 2, CandidateSet);
1533
1534 OverloadCandidateSet::iterator Best;
Douglas Gregore0762c92009-06-19 23:52:42 +00001535 switch (Self.BestViableFunction(CandidateSet, Loc, Best)) {
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001536 case Sema::OR_Success:
1537 // We found a match. Perform the conversions on the arguments and move on.
1538 if (Self.PerformImplicitConversion(LHS, Best->BuiltinTypes.ParamTypes[0],
1539 Best->Conversions[0], "converting") ||
1540 Self.PerformImplicitConversion(RHS, Best->BuiltinTypes.ParamTypes[1],
1541 Best->Conversions[1], "converting"))
1542 break;
1543 return false;
1544
1545 case Sema::OR_No_Viable_Function:
1546 Self.Diag(Loc, diag::err_typecheck_cond_incompatible_operands)
1547 << LHS->getType() << RHS->getType()
1548 << LHS->getSourceRange() << RHS->getSourceRange();
1549 return true;
1550
1551 case Sema::OR_Ambiguous:
1552 Self.Diag(Loc, diag::err_conditional_ambiguous_ovl)
1553 << LHS->getType() << RHS->getType()
1554 << LHS->getSourceRange() << RHS->getSourceRange();
Mike Stump390b4cc2009-05-16 07:39:55 +00001555 // FIXME: Print the possible common types by printing the return types of
1556 // the viable candidates.
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001557 break;
1558
1559 case Sema::OR_Deleted:
1560 assert(false && "Conditional operator has only built-in overloads");
1561 break;
1562 }
1563 return true;
1564}
1565
Sebastian Redl76458502009-04-17 16:30:52 +00001566/// \brief Perform an "extended" implicit conversion as returned by
1567/// TryClassUnification.
1568///
1569/// TryClassUnification generates ICSs that include reference bindings.
1570/// PerformImplicitConversion is not suitable for this; it chokes if the
1571/// second part of a standard conversion is ICK_DerivedToBase. This function
1572/// handles the reference binding specially.
1573static bool ConvertForConditional(Sema &Self, Expr *&E,
Mike Stump1eb44332009-09-09 15:08:12 +00001574 const ImplicitConversionSequence &ICS) {
Sebastian Redl76458502009-04-17 16:30:52 +00001575 if (ICS.ConversionKind == ImplicitConversionSequence::StandardConversion &&
1576 ICS.Standard.ReferenceBinding) {
1577 assert(ICS.Standard.DirectBinding &&
1578 "TryClassUnification should never generate indirect ref bindings");
Sebastian Redla5cd2cd2009-04-26 11:21:02 +00001579 // FIXME: CheckReferenceInit should be able to reuse the ICS instead of
1580 // redoing all the work.
1581 return Self.CheckReferenceInit(E, Self.Context.getLValueReferenceType(
Anders Carlsson2de3ace2009-08-27 17:30:43 +00001582 TargetType(ICS)),
Douglas Gregor739d8282009-09-23 23:04:10 +00001583 /*FIXME:*/E->getLocStart(),
Anders Carlsson2de3ace2009-08-27 17:30:43 +00001584 /*SuppressUserConversions=*/false,
1585 /*AllowExplicit=*/false,
1586 /*ForceRValue=*/false);
Sebastian Redl76458502009-04-17 16:30:52 +00001587 }
1588 if (ICS.ConversionKind == ImplicitConversionSequence::UserDefinedConversion &&
1589 ICS.UserDefined.After.ReferenceBinding) {
1590 assert(ICS.UserDefined.After.DirectBinding &&
1591 "TryClassUnification should never generate indirect ref bindings");
Sebastian Redla5cd2cd2009-04-26 11:21:02 +00001592 return Self.CheckReferenceInit(E, Self.Context.getLValueReferenceType(
Anders Carlsson2de3ace2009-08-27 17:30:43 +00001593 TargetType(ICS)),
Douglas Gregor739d8282009-09-23 23:04:10 +00001594 /*FIXME:*/E->getLocStart(),
Anders Carlsson2de3ace2009-08-27 17:30:43 +00001595 /*SuppressUserConversions=*/false,
1596 /*AllowExplicit=*/false,
1597 /*ForceRValue=*/false);
Sebastian Redl76458502009-04-17 16:30:52 +00001598 }
1599 if (Self.PerformImplicitConversion(E, TargetType(ICS), ICS, "converting"))
1600 return true;
1601 return false;
1602}
1603
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001604/// \brief Check the operands of ?: under C++ semantics.
1605///
1606/// See C++ [expr.cond]. Note that LHS is never null, even for the GNU x ?: y
1607/// extension. In this case, LHS == Cond. (But they're not aliases.)
1608QualType Sema::CXXCheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS,
1609 SourceLocation QuestionLoc) {
Mike Stump390b4cc2009-05-16 07:39:55 +00001610 // FIXME: Handle C99's complex types, vector types, block pointers and Obj-C++
1611 // interface pointers.
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001612
1613 // C++0x 5.16p1
1614 // The first expression is contextually converted to bool.
1615 if (!Cond->isTypeDependent()) {
1616 if (CheckCXXBooleanCondition(Cond))
1617 return QualType();
1618 }
1619
1620 // Either of the arguments dependent?
1621 if (LHS->isTypeDependent() || RHS->isTypeDependent())
1622 return Context.DependentTy;
1623
1624 // C++0x 5.16p2
1625 // If either the second or the third operand has type (cv) void, ...
1626 QualType LTy = LHS->getType();
1627 QualType RTy = RHS->getType();
1628 bool LVoid = LTy->isVoidType();
1629 bool RVoid = RTy->isVoidType();
1630 if (LVoid || RVoid) {
1631 // ... then the [l2r] conversions are performed on the second and third
1632 // operands ...
1633 DefaultFunctionArrayConversion(LHS);
1634 DefaultFunctionArrayConversion(RHS);
1635 LTy = LHS->getType();
1636 RTy = RHS->getType();
1637
1638 // ... and one of the following shall hold:
1639 // -- The second or the third operand (but not both) is a throw-
1640 // expression; the result is of the type of the other and is an rvalue.
1641 bool LThrow = isa<CXXThrowExpr>(LHS);
1642 bool RThrow = isa<CXXThrowExpr>(RHS);
1643 if (LThrow && !RThrow)
1644 return RTy;
1645 if (RThrow && !LThrow)
1646 return LTy;
1647
1648 // -- Both the second and third operands have type void; the result is of
1649 // type void and is an rvalue.
1650 if (LVoid && RVoid)
1651 return Context.VoidTy;
1652
1653 // Neither holds, error.
1654 Diag(QuestionLoc, diag::err_conditional_void_nonvoid)
1655 << (LVoid ? RTy : LTy) << (LVoid ? 0 : 1)
1656 << LHS->getSourceRange() << RHS->getSourceRange();
1657 return QualType();
1658 }
1659
1660 // Neither is void.
1661
1662 // C++0x 5.16p3
1663 // Otherwise, if the second and third operand have different types, and
1664 // either has (cv) class type, and attempt is made to convert each of those
1665 // operands to the other.
1666 if (Context.getCanonicalType(LTy) != Context.getCanonicalType(RTy) &&
1667 (LTy->isRecordType() || RTy->isRecordType())) {
1668 ImplicitConversionSequence ICSLeftToRight, ICSRightToLeft;
1669 // These return true if a single direction is already ambiguous.
1670 if (TryClassUnification(*this, LHS, RHS, QuestionLoc, ICSLeftToRight))
1671 return QualType();
1672 if (TryClassUnification(*this, RHS, LHS, QuestionLoc, ICSRightToLeft))
1673 return QualType();
1674
1675 bool HaveL2R = ICSLeftToRight.ConversionKind !=
1676 ImplicitConversionSequence::BadConversion;
1677 bool HaveR2L = ICSRightToLeft.ConversionKind !=
1678 ImplicitConversionSequence::BadConversion;
1679 // If both can be converted, [...] the program is ill-formed.
1680 if (HaveL2R && HaveR2L) {
1681 Diag(QuestionLoc, diag::err_conditional_ambiguous)
1682 << LTy << RTy << LHS->getSourceRange() << RHS->getSourceRange();
1683 return QualType();
1684 }
1685
1686 // If exactly one conversion is possible, that conversion is applied to
1687 // the chosen operand and the converted operands are used in place of the
1688 // original operands for the remainder of this section.
1689 if (HaveL2R) {
Sebastian Redl76458502009-04-17 16:30:52 +00001690 if (ConvertForConditional(*this, LHS, ICSLeftToRight))
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001691 return QualType();
1692 LTy = LHS->getType();
1693 } else if (HaveR2L) {
Sebastian Redl76458502009-04-17 16:30:52 +00001694 if (ConvertForConditional(*this, RHS, ICSRightToLeft))
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001695 return QualType();
1696 RTy = RHS->getType();
1697 }
1698 }
1699
1700 // C++0x 5.16p4
1701 // If the second and third operands are lvalues and have the same type,
1702 // the result is of that type [...]
1703 bool Same = Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy);
1704 if (Same && LHS->isLvalue(Context) == Expr::LV_Valid &&
1705 RHS->isLvalue(Context) == Expr::LV_Valid)
1706 return LTy;
1707
1708 // C++0x 5.16p5
1709 // Otherwise, the result is an rvalue. If the second and third operands
1710 // do not have the same type, and either has (cv) class type, ...
1711 if (!Same && (LTy->isRecordType() || RTy->isRecordType())) {
1712 // ... overload resolution is used to determine the conversions (if any)
1713 // to be applied to the operands. If the overload resolution fails, the
1714 // program is ill-formed.
1715 if (FindConditionalOverload(*this, LHS, RHS, QuestionLoc))
1716 return QualType();
1717 }
1718
1719 // C++0x 5.16p6
1720 // LValue-to-rvalue, array-to-pointer, and function-to-pointer standard
1721 // conversions are performed on the second and third operands.
1722 DefaultFunctionArrayConversion(LHS);
1723 DefaultFunctionArrayConversion(RHS);
1724 LTy = LHS->getType();
1725 RTy = RHS->getType();
1726
1727 // After those conversions, one of the following shall hold:
1728 // -- The second and third operands have the same type; the result
1729 // is of that type.
1730 if (Context.getCanonicalType(LTy) == Context.getCanonicalType(RTy))
1731 return LTy;
1732
1733 // -- The second and third operands have arithmetic or enumeration type;
1734 // the usual arithmetic conversions are performed to bring them to a
1735 // common type, and the result is of that type.
1736 if (LTy->isArithmeticType() && RTy->isArithmeticType()) {
1737 UsualArithmeticConversions(LHS, RHS);
1738 return LHS->getType();
1739 }
1740
1741 // -- The second and third operands have pointer type, or one has pointer
1742 // type and the other is a null pointer constant; pointer conversions
1743 // and qualification conversions are performed to bring them to their
1744 // composite pointer type. The result is of the composite pointer type.
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001745 QualType Composite = FindCompositePointerType(LHS, RHS);
1746 if (!Composite.isNull())
1747 return Composite;
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001748
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001749 // Fourth bullet is same for pointers-to-member. However, the possible
1750 // conversions are far more limited: we have null-to-pointer, upcast of
1751 // containing class, and second-level cv-ness.
1752 // cv-ness is not a union, but must match one of the two operands. (Which,
1753 // frankly, is stupid.)
Ted Kremenek6217b802009-07-29 21:53:49 +00001754 const MemberPointerType *LMemPtr = LTy->getAs<MemberPointerType>();
1755 const MemberPointerType *RMemPtr = RTy->getAs<MemberPointerType>();
Douglas Gregorce940492009-09-25 04:25:58 +00001756 if (LMemPtr &&
1757 RHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00001758 ImpCastExprToType(RHS, LTy, CastExpr::CK_NullToMemberPointer);
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001759 return LTy;
1760 }
Douglas Gregorce940492009-09-25 04:25:58 +00001761 if (RMemPtr &&
1762 LHS->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00001763 ImpCastExprToType(LHS, RTy, CastExpr::CK_NullToMemberPointer);
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001764 return RTy;
1765 }
1766 if (LMemPtr && RMemPtr) {
1767 QualType LPointee = LMemPtr->getPointeeType();
1768 QualType RPointee = RMemPtr->getPointeeType();
John McCall0953e762009-09-24 19:53:00 +00001769
1770 QualifierCollector LPQuals, RPQuals;
1771 const Type *LPCan = LPQuals.strip(Context.getCanonicalType(LPointee));
1772 const Type *RPCan = RPQuals.strip(Context.getCanonicalType(RPointee));
1773
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001774 // First, we check that the unqualified pointee type is the same. If it's
1775 // not, there's no conversion that will unify the two pointers.
John McCall0953e762009-09-24 19:53:00 +00001776 if (LPCan == RPCan) {
1777
1778 // Second, we take the greater of the two qualifications. If neither
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001779 // is greater than the other, the conversion is not possible.
John McCall0953e762009-09-24 19:53:00 +00001780
1781 Qualifiers MergedQuals = LPQuals + RPQuals;
1782
1783 bool CompatibleQuals = true;
1784 if (MergedQuals.getCVRQualifiers() != LPQuals.getCVRQualifiers() &&
1785 MergedQuals.getCVRQualifiers() != RPQuals.getCVRQualifiers())
1786 CompatibleQuals = false;
1787 else if (LPQuals.getAddressSpace() != RPQuals.getAddressSpace())
1788 // FIXME:
1789 // C99 6.5.15 as modified by TR 18037:
1790 // If the second and third operands are pointers into different
1791 // address spaces, the address spaces must overlap.
1792 CompatibleQuals = false;
1793 // FIXME: GC qualifiers?
1794
1795 if (CompatibleQuals) {
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001796 // Third, we check if either of the container classes is derived from
1797 // the other.
1798 QualType LContainer(LMemPtr->getClass(), 0);
1799 QualType RContainer(RMemPtr->getClass(), 0);
1800 QualType MoreDerived;
1801 if (Context.getCanonicalType(LContainer) ==
1802 Context.getCanonicalType(RContainer))
1803 MoreDerived = LContainer;
1804 else if (IsDerivedFrom(LContainer, RContainer))
1805 MoreDerived = LContainer;
1806 else if (IsDerivedFrom(RContainer, LContainer))
1807 MoreDerived = RContainer;
1808
1809 if (!MoreDerived.isNull()) {
1810 // The type 'Q Pointee (MoreDerived::*)' is the common type.
1811 // We don't use ImpCastExprToType here because this could still fail
1812 // for ambiguous or inaccessible conversions.
John McCall0953e762009-09-24 19:53:00 +00001813 LPointee = Context.getQualifiedType(LPointee, MergedQuals);
1814 QualType Common
1815 = Context.getMemberPointerType(LPointee, MoreDerived.getTypePtr());
Sebastian Redl9bebfad2009-04-19 21:15:26 +00001816 if (PerformImplicitConversion(LHS, Common, "converting"))
1817 return QualType();
1818 if (PerformImplicitConversion(RHS, Common, "converting"))
1819 return QualType();
1820 return Common;
1821 }
1822 }
1823 }
1824 }
1825
Sebastian Redl3201f6b2009-04-16 17:51:27 +00001826 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands)
1827 << LHS->getType() << RHS->getType()
1828 << LHS->getSourceRange() << RHS->getSourceRange();
1829 return QualType();
1830}
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001831
1832/// \brief Find a merged pointer type and convert the two expressions to it.
1833///
Douglas Gregor20b3e992009-08-24 17:42:35 +00001834/// This finds the composite pointer type (or member pointer type) for @p E1
1835/// and @p E2 according to C++0x 5.9p2. It converts both expressions to this
1836/// type and returns it.
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001837/// It does not emit diagnostics.
1838QualType Sema::FindCompositePointerType(Expr *&E1, Expr *&E2) {
1839 assert(getLangOptions().CPlusPlus && "This function assumes C++");
1840 QualType T1 = E1->getType(), T2 = E2->getType();
Mike Stump1eb44332009-09-09 15:08:12 +00001841
Douglas Gregor20b3e992009-08-24 17:42:35 +00001842 if (!T1->isPointerType() && !T1->isMemberPointerType() &&
1843 !T2->isPointerType() && !T2->isMemberPointerType())
1844 return QualType();
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001845
Douglas Gregor20b3e992009-08-24 17:42:35 +00001846 // FIXME: Do we need to work on the canonical types?
Mike Stump1eb44332009-09-09 15:08:12 +00001847
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001848 // C++0x 5.9p2
1849 // Pointer conversions and qualification conversions are performed on
1850 // pointer operands to bring them to their composite pointer type. If
1851 // one operand is a null pointer constant, the composite pointer type is
1852 // the type of the other operand.
Douglas Gregorce940492009-09-25 04:25:58 +00001853 if (E1->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00001854 if (T2->isMemberPointerType())
1855 ImpCastExprToType(E1, T2, CastExpr::CK_NullToMemberPointer);
1856 else
1857 ImpCastExprToType(E1, T2, CastExpr::CK_IntegralToPointer);
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001858 return T2;
1859 }
Douglas Gregorce940492009-09-25 04:25:58 +00001860 if (E2->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull)) {
Eli Friedman73c39ab2009-10-20 08:27:19 +00001861 if (T1->isMemberPointerType())
1862 ImpCastExprToType(E2, T1, CastExpr::CK_NullToMemberPointer);
1863 else
1864 ImpCastExprToType(E2, T1, CastExpr::CK_IntegralToPointer);
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001865 return T1;
1866 }
Mike Stump1eb44332009-09-09 15:08:12 +00001867
Douglas Gregor20b3e992009-08-24 17:42:35 +00001868 // Now both have to be pointers or member pointers.
1869 if (!T1->isPointerType() && !T1->isMemberPointerType() &&
1870 !T2->isPointerType() && !T2->isMemberPointerType())
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001871 return QualType();
1872
1873 // Otherwise, of one of the operands has type "pointer to cv1 void," then
1874 // the other has type "pointer to cv2 T" and the composite pointer type is
1875 // "pointer to cv12 void," where cv12 is the union of cv1 and cv2.
1876 // Otherwise, the composite pointer type is a pointer type similar to the
1877 // type of one of the operands, with a cv-qualification signature that is
1878 // the union of the cv-qualification signatures of the operand types.
1879 // In practice, the first part here is redundant; it's subsumed by the second.
1880 // What we do here is, we build the two possible composite types, and try the
1881 // conversions in both directions. If only one works, or if the two composite
1882 // types are the same, we have succeeded.
John McCall0953e762009-09-24 19:53:00 +00001883 // FIXME: extended qualifiers?
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001884 llvm::SmallVector<unsigned, 4> QualifierUnion;
Douglas Gregor20b3e992009-08-24 17:42:35 +00001885 llvm::SmallVector<std::pair<const Type *, const Type *>, 4> MemberOfClass;
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001886 QualType Composite1 = T1, Composite2 = T2;
Douglas Gregor20b3e992009-08-24 17:42:35 +00001887 do {
1888 const PointerType *Ptr1, *Ptr2;
1889 if ((Ptr1 = Composite1->getAs<PointerType>()) &&
1890 (Ptr2 = Composite2->getAs<PointerType>())) {
1891 Composite1 = Ptr1->getPointeeType();
1892 Composite2 = Ptr2->getPointeeType();
1893 QualifierUnion.push_back(
1894 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
1895 MemberOfClass.push_back(std::make_pair((const Type *)0, (const Type *)0));
1896 continue;
1897 }
Mike Stump1eb44332009-09-09 15:08:12 +00001898
Douglas Gregor20b3e992009-08-24 17:42:35 +00001899 const MemberPointerType *MemPtr1, *MemPtr2;
1900 if ((MemPtr1 = Composite1->getAs<MemberPointerType>()) &&
1901 (MemPtr2 = Composite2->getAs<MemberPointerType>())) {
1902 Composite1 = MemPtr1->getPointeeType();
1903 Composite2 = MemPtr2->getPointeeType();
1904 QualifierUnion.push_back(
1905 Composite1.getCVRQualifiers() | Composite2.getCVRQualifiers());
1906 MemberOfClass.push_back(std::make_pair(MemPtr1->getClass(),
1907 MemPtr2->getClass()));
1908 continue;
1909 }
Mike Stump1eb44332009-09-09 15:08:12 +00001910
Douglas Gregor20b3e992009-08-24 17:42:35 +00001911 // FIXME: block pointer types?
Mike Stump1eb44332009-09-09 15:08:12 +00001912
Douglas Gregor20b3e992009-08-24 17:42:35 +00001913 // Cannot unwrap any more types.
1914 break;
1915 } while (true);
Mike Stump1eb44332009-09-09 15:08:12 +00001916
Douglas Gregor20b3e992009-08-24 17:42:35 +00001917 // Rewrap the composites as pointers or member pointers with the union CVRs.
1918 llvm::SmallVector<std::pair<const Type *, const Type *>, 4>::iterator MOC
1919 = MemberOfClass.begin();
Mike Stump1eb44332009-09-09 15:08:12 +00001920 for (llvm::SmallVector<unsigned, 4>::iterator
Douglas Gregor20b3e992009-08-24 17:42:35 +00001921 I = QualifierUnion.begin(),
Mike Stump1eb44332009-09-09 15:08:12 +00001922 E = QualifierUnion.end();
Douglas Gregor20b3e992009-08-24 17:42:35 +00001923 I != E; (void)++I, ++MOC) {
John McCall0953e762009-09-24 19:53:00 +00001924 Qualifiers Quals = Qualifiers::fromCVRMask(*I);
Douglas Gregor20b3e992009-08-24 17:42:35 +00001925 if (MOC->first && MOC->second) {
1926 // Rebuild member pointer type
John McCall0953e762009-09-24 19:53:00 +00001927 Composite1 = Context.getMemberPointerType(
1928 Context.getQualifiedType(Composite1, Quals),
1929 MOC->first);
1930 Composite2 = Context.getMemberPointerType(
1931 Context.getQualifiedType(Composite2, Quals),
1932 MOC->second);
Douglas Gregor20b3e992009-08-24 17:42:35 +00001933 } else {
1934 // Rebuild pointer type
John McCall0953e762009-09-24 19:53:00 +00001935 Composite1
1936 = Context.getPointerType(Context.getQualifiedType(Composite1, Quals));
1937 Composite2
1938 = Context.getPointerType(Context.getQualifiedType(Composite2, Quals));
Douglas Gregor20b3e992009-08-24 17:42:35 +00001939 }
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001940 }
1941
Mike Stump1eb44332009-09-09 15:08:12 +00001942 ImplicitConversionSequence E1ToC1 =
Anders Carlssonda7a18b2009-08-27 17:24:15 +00001943 TryImplicitConversion(E1, Composite1,
1944 /*SuppressUserConversions=*/false,
1945 /*AllowExplicit=*/false,
Anders Carlsson08972922009-08-28 15:33:32 +00001946 /*ForceRValue=*/false,
1947 /*InOverloadResolution=*/false);
Mike Stump1eb44332009-09-09 15:08:12 +00001948 ImplicitConversionSequence E2ToC1 =
Anders Carlssonda7a18b2009-08-27 17:24:15 +00001949 TryImplicitConversion(E2, Composite1,
1950 /*SuppressUserConversions=*/false,
1951 /*AllowExplicit=*/false,
Anders Carlsson08972922009-08-28 15:33:32 +00001952 /*ForceRValue=*/false,
1953 /*InOverloadResolution=*/false);
Mike Stump1eb44332009-09-09 15:08:12 +00001954
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001955 ImplicitConversionSequence E1ToC2, E2ToC2;
1956 E1ToC2.ConversionKind = ImplicitConversionSequence::BadConversion;
1957 E2ToC2.ConversionKind = ImplicitConversionSequence::BadConversion;
1958 if (Context.getCanonicalType(Composite1) !=
1959 Context.getCanonicalType(Composite2)) {
Anders Carlssonda7a18b2009-08-27 17:24:15 +00001960 E1ToC2 = TryImplicitConversion(E1, Composite2,
1961 /*SuppressUserConversions=*/false,
1962 /*AllowExplicit=*/false,
Anders Carlsson08972922009-08-28 15:33:32 +00001963 /*ForceRValue=*/false,
1964 /*InOverloadResolution=*/false);
Anders Carlssonda7a18b2009-08-27 17:24:15 +00001965 E2ToC2 = TryImplicitConversion(E2, Composite2,
1966 /*SuppressUserConversions=*/false,
1967 /*AllowExplicit=*/false,
Anders Carlsson08972922009-08-28 15:33:32 +00001968 /*ForceRValue=*/false,
1969 /*InOverloadResolution=*/false);
Sebastian Redld1bd7fc2009-04-19 19:26:31 +00001970 }
1971
1972 bool ToC1Viable = E1ToC1.ConversionKind !=
1973 ImplicitConversionSequence::BadConversion
1974 && E2ToC1.ConversionKind !=
1975 ImplicitConversionSequence::BadConversion;
1976 bool ToC2Viable = E1ToC2.ConversionKind !=
1977 ImplicitConversionSequence::BadConversion
1978 && E2ToC2.ConversionKind !=
1979 ImplicitConversionSequence::BadConversion;
1980 if (ToC1Viable && !ToC2Viable) {
1981 if (!PerformImplicitConversion(E1, Composite1, E1ToC1, "converting") &&
1982 !PerformImplicitConversion(E2, Composite1, E2ToC1, "converting"))
1983 return Composite1;
1984 }
1985 if (ToC2Viable && !ToC1Viable) {
1986 if (!PerformImplicitConversion(E1, Composite2, E1ToC2, "converting") &&
1987 !PerformImplicitConversion(E2, Composite2, E2ToC2, "converting"))
1988 return Composite2;
1989 }
1990 return QualType();
1991}
Anders Carlsson165a0a02009-05-17 18:41:29 +00001992
Anders Carlssondef11992009-05-30 20:36:53 +00001993Sema::OwningExprResult Sema::MaybeBindToTemporary(Expr *E) {
Anders Carlsson089c2602009-08-15 23:41:35 +00001994 if (!Context.getLangOptions().CPlusPlus)
1995 return Owned(E);
Mike Stump1eb44332009-09-09 15:08:12 +00001996
Ted Kremenek6217b802009-07-29 21:53:49 +00001997 const RecordType *RT = E->getType()->getAs<RecordType>();
Anders Carlssondef11992009-05-30 20:36:53 +00001998 if (!RT)
1999 return Owned(E);
Mike Stump1eb44332009-09-09 15:08:12 +00002000
Anders Carlssondef11992009-05-30 20:36:53 +00002001 CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
2002 if (RD->hasTrivialDestructor())
2003 return Owned(E);
Mike Stump1eb44332009-09-09 15:08:12 +00002004
Anders Carlsson283e4d52009-09-14 01:30:44 +00002005 if (CallExpr *CE = dyn_cast<CallExpr>(E)) {
2006 QualType Ty = CE->getCallee()->getType();
2007 if (const PointerType *PT = Ty->getAs<PointerType>())
2008 Ty = PT->getPointeeType();
2009
John McCall183700f2009-09-21 23:43:11 +00002010 const FunctionType *FTy = Ty->getAs<FunctionType>();
Anders Carlsson283e4d52009-09-14 01:30:44 +00002011 if (FTy->getResultType()->isReferenceType())
2012 return Owned(E);
2013 }
Mike Stump1eb44332009-09-09 15:08:12 +00002014 CXXTemporary *Temp = CXXTemporary::Create(Context,
Anders Carlssondef11992009-05-30 20:36:53 +00002015 RD->getDestructor(Context));
Anders Carlsson860306e2009-05-30 21:21:49 +00002016 ExprTemporaries.push_back(Temp);
Fariborz Jahaniana83f7ed2009-08-03 19:13:25 +00002017 if (CXXDestructorDecl *Destructor =
2018 const_cast<CXXDestructorDecl*>(RD->getDestructor(Context)))
2019 MarkDeclarationReferenced(E->getExprLoc(), Destructor);
Anders Carlssondef11992009-05-30 20:36:53 +00002020 // FIXME: Add the temporary to the temporaries vector.
2021 return Owned(CXXBindTemporaryExpr::Create(Context, Temp, E));
2022}
2023
Mike Stump1eb44332009-09-09 15:08:12 +00002024Expr *Sema::MaybeCreateCXXExprWithTemporaries(Expr *SubExpr,
Anders Carlssonf54741e2009-06-16 03:37:31 +00002025 bool ShouldDestroyTemps) {
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002026 assert(SubExpr && "sub expression can't be null!");
Mike Stump1eb44332009-09-09 15:08:12 +00002027
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002028 if (ExprTemporaries.empty())
2029 return SubExpr;
Mike Stump1eb44332009-09-09 15:08:12 +00002030
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002031 Expr *E = CXXExprWithTemporaries::Create(Context, SubExpr,
Mike Stump1eb44332009-09-09 15:08:12 +00002032 &ExprTemporaries[0],
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002033 ExprTemporaries.size(),
Anders Carlssonf54741e2009-06-16 03:37:31 +00002034 ShouldDestroyTemps);
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002035 ExprTemporaries.clear();
Mike Stump1eb44332009-09-09 15:08:12 +00002036
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002037 return E;
2038}
2039
Mike Stump1eb44332009-09-09 15:08:12 +00002040Sema::OwningExprResult
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002041Sema::ActOnStartCXXMemberReference(Scope *S, ExprArg Base, SourceLocation OpLoc,
2042 tok::TokenKind OpKind, TypeTy *&ObjectType) {
2043 // Since this might be a postfix expression, get rid of ParenListExprs.
2044 Base = MaybeConvertParenListExprToParenExpr(S, move(Base));
Mike Stump1eb44332009-09-09 15:08:12 +00002045
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002046 Expr *BaseExpr = (Expr*)Base.get();
2047 assert(BaseExpr && "no record expansion");
Mike Stump1eb44332009-09-09 15:08:12 +00002048
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002049 QualType BaseType = BaseExpr->getType();
2050 if (BaseType->isDependentType()) {
2051 // FIXME: member of the current instantiation
2052 ObjectType = BaseType.getAsOpaquePtr();
2053 return move(Base);
2054 }
Mike Stump1eb44332009-09-09 15:08:12 +00002055
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002056 // C++ [over.match.oper]p8:
Mike Stump1eb44332009-09-09 15:08:12 +00002057 // [...] When operator->returns, the operator-> is applied to the value
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002058 // returned, with the original second operand.
2059 if (OpKind == tok::arrow) {
John McCallc4e83212009-09-30 01:01:30 +00002060 // The set of types we've considered so far.
John McCall432887f2009-09-30 01:30:54 +00002061 llvm::SmallPtrSet<CanQualType,8> CTypes;
Fariborz Jahanian7a8233a2009-09-30 17:46:20 +00002062 llvm::SmallVector<SourceLocation, 8> Locations;
John McCall432887f2009-09-30 01:30:54 +00002063 CTypes.insert(Context.getCanonicalType(BaseType));
John McCallc4e83212009-09-30 01:01:30 +00002064
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002065 while (BaseType->isRecordType()) {
Anders Carlsson15ea3782009-10-13 22:43:21 +00002066 Base = BuildOverloadedArrowExpr(S, move(Base), OpLoc);
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002067 BaseExpr = (Expr*)Base.get();
2068 if (BaseExpr == NULL)
2069 return ExprError();
Fariborz Jahanian7a8233a2009-09-30 17:46:20 +00002070 if (CXXOperatorCallExpr *OpCall = dyn_cast<CXXOperatorCallExpr>(BaseExpr))
Anders Carlssonde699e52009-10-13 22:55:59 +00002071 Locations.push_back(OpCall->getDirectCallee()->getLocation());
John McCallc4e83212009-09-30 01:01:30 +00002072 BaseType = BaseExpr->getType();
2073 CanQualType CBaseType = Context.getCanonicalType(BaseType);
John McCall432887f2009-09-30 01:30:54 +00002074 if (!CTypes.insert(CBaseType)) {
Fariborz Jahanian4a4e3452009-09-30 00:19:41 +00002075 Diag(OpLoc, diag::err_operator_arrow_circular);
Fariborz Jahanian7a8233a2009-09-30 17:46:20 +00002076 for (unsigned i = 0; i < Locations.size(); i++)
2077 Diag(Locations[i], diag::note_declared_at);
Fariborz Jahanian4a4e3452009-09-30 00:19:41 +00002078 return ExprError();
2079 }
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002080 }
2081 }
Mike Stump1eb44332009-09-09 15:08:12 +00002082
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002083 if (BaseType->isPointerType())
2084 BaseType = BaseType->getPointeeType();
Mike Stump1eb44332009-09-09 15:08:12 +00002085
2086 // We could end up with various non-record types here, such as extended
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002087 // vector types or Objective-C interfaces. Just return early and let
2088 // ActOnMemberReferenceExpr do the work.
Douglas Gregorc68afe22009-09-03 21:38:09 +00002089 if (!BaseType->isRecordType()) {
2090 // C++ [basic.lookup.classref]p2:
2091 // [...] If the type of the object expression is of pointer to scalar
2092 // type, the unqualified-id is looked up in the context of the complete
2093 // postfix-expression.
2094 ObjectType = 0;
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002095 return move(Base);
Douglas Gregorc68afe22009-09-03 21:38:09 +00002096 }
Mike Stump1eb44332009-09-09 15:08:12 +00002097
Douglas Gregorc68afe22009-09-03 21:38:09 +00002098 // C++ [basic.lookup.classref]p2:
Mike Stump1eb44332009-09-09 15:08:12 +00002099 // If the id-expression in a class member access (5.2.5) is an
Douglas Gregorc68afe22009-09-03 21:38:09 +00002100 // unqualified-id, and the type of the object expres- sion is of a class
2101 // type C (or of pointer to a class type C), the unqualified-id is looked
2102 // up in the scope of class C. [...]
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002103 ObjectType = BaseType.getAsOpaquePtr();
Mike Stump1eb44332009-09-09 15:08:12 +00002104 return move(Base);
Douglas Gregor2dd078a2009-09-02 22:59:36 +00002105}
2106
Anders Carlssonec773872009-08-25 23:46:41 +00002107Sema::OwningExprResult
Anders Carlsson3aa4ca42009-08-26 17:36:19 +00002108Sema::ActOnDestructorReferenceExpr(Scope *S, ExprArg Base,
Anders Carlssonec773872009-08-25 23:46:41 +00002109 SourceLocation OpLoc,
2110 tok::TokenKind OpKind,
2111 SourceLocation ClassNameLoc,
2112 IdentifierInfo *ClassName,
Douglas Gregora78c5c32009-09-04 18:29:40 +00002113 const CXXScopeSpec &SS,
2114 bool HasTrailingLParen) {
2115 if (SS.isInvalid())
Anders Carlssonec773872009-08-25 23:46:41 +00002116 return ExprError();
Anders Carlsson2cf738f2009-08-26 19:22:42 +00002117
Douglas Gregora71d8192009-09-04 17:36:40 +00002118 QualType BaseType;
Douglas Gregora78c5c32009-09-04 18:29:40 +00002119 if (isUnknownSpecialization(SS))
2120 BaseType = Context.getTypenameType((NestedNameSpecifier *)SS.getScopeRep(),
Douglas Gregora71d8192009-09-04 17:36:40 +00002121 ClassName);
2122 else {
Douglas Gregora78c5c32009-09-04 18:29:40 +00002123 TypeTy *BaseTy = getTypeName(*ClassName, ClassNameLoc, S, &SS);
Douglas Gregordd62b152009-10-19 22:04:39 +00002124
2125 // FIXME: If Base is dependent, we might not be able to resolve it here.
Douglas Gregora71d8192009-09-04 17:36:40 +00002126 if (!BaseTy) {
Mike Stump1eb44332009-09-09 15:08:12 +00002127 Diag(ClassNameLoc, diag::err_ident_in_pseudo_dtor_not_a_type)
Douglas Gregora71d8192009-09-04 17:36:40 +00002128 << ClassName;
2129 return ExprError();
2130 }
Mike Stump1eb44332009-09-09 15:08:12 +00002131
Douglas Gregora71d8192009-09-04 17:36:40 +00002132 BaseType = GetTypeFromParser(BaseTy);
Anders Carlsson2cf738f2009-08-26 19:22:42 +00002133 }
Mike Stump1eb44332009-09-09 15:08:12 +00002134
Douglas Gregordd62b152009-10-19 22:04:39 +00002135 return ActOnDestructorReferenceExpr(S, move(Base), OpLoc, OpKind,
2136 SourceRange(ClassNameLoc),
2137 BaseType.getAsOpaquePtr(),
2138 SS, HasTrailingLParen);
2139}
Anders Carlsson2cf738f2009-08-26 19:22:42 +00002140
Douglas Gregordd62b152009-10-19 22:04:39 +00002141Sema::OwningExprResult
2142Sema::ActOnDestructorReferenceExpr(Scope *S, ExprArg Base,
2143 SourceLocation OpLoc,
2144 tok::TokenKind OpKind,
2145 SourceRange TypeRange,
2146 TypeTy *T,
2147 const CXXScopeSpec &SS,
2148 bool HasTrailingLParen) {
2149 QualType Type = QualType::getFromOpaquePtr(T);
2150 CanQualType CanType = Context.getCanonicalType(Type);
2151 DeclarationName DtorName =
2152 Context.DeclarationNames.getCXXDestructorName(CanType);
2153
Douglas Gregora78c5c32009-09-04 18:29:40 +00002154 OwningExprResult Result
Douglas Gregordd62b152009-10-19 22:04:39 +00002155 = BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind,
2156 TypeRange.getBegin(), DtorName, DeclPtrTy(),
2157 &SS);
Douglas Gregora78c5c32009-09-04 18:29:40 +00002158 if (Result.isInvalid() || HasTrailingLParen)
2159 return move(Result);
Douglas Gregordd62b152009-10-19 22:04:39 +00002160
Mike Stump1eb44332009-09-09 15:08:12 +00002161 // The only way a reference to a destructor can be used is to
Douglas Gregora78c5c32009-09-04 18:29:40 +00002162 // immediately call them. Since the next token is not a '(', produce a
2163 // diagnostic and build the call now.
2164 Expr *E = (Expr *)Result.get();
Douglas Gregordd62b152009-10-19 22:04:39 +00002165 SourceLocation ExpectedLParenLoc = PP.getLocForEndOfToken(TypeRange.getEnd());
Douglas Gregora78c5c32009-09-04 18:29:40 +00002166 Diag(E->getLocStart(), diag::err_dtor_expr_without_call)
2167 << isa<CXXPseudoDestructorExpr>(E)
2168 << CodeModificationHint::CreateInsertion(ExpectedLParenLoc, "()");
Douglas Gregordd62b152009-10-19 22:04:39 +00002169
Mike Stump1eb44332009-09-09 15:08:12 +00002170 return ActOnCallExpr(0, move(Result), ExpectedLParenLoc,
Douglas Gregora78c5c32009-09-04 18:29:40 +00002171 MultiExprArg(*this, 0, 0), 0, ExpectedLParenLoc);
Anders Carlssonec773872009-08-25 23:46:41 +00002172}
2173
Douglas Gregora6f0f9d2009-08-31 19:52:13 +00002174Sema::OwningExprResult
2175Sema::ActOnOverloadedOperatorReferenceExpr(Scope *S, ExprArg Base,
2176 SourceLocation OpLoc,
2177 tok::TokenKind OpKind,
2178 SourceLocation ClassNameLoc,
2179 OverloadedOperatorKind OverOpKind,
2180 const CXXScopeSpec *SS) {
2181 if (SS && SS->isInvalid())
2182 return ExprError();
2183
2184 DeclarationName Name =
2185 Context.DeclarationNames.getCXXOperatorName(OverOpKind);
2186
2187 return BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, ClassNameLoc,
2188 Name, DeclPtrTy(), SS);
2189}
2190
2191Sema::OwningExprResult
2192Sema::ActOnConversionOperatorReferenceExpr(Scope *S, ExprArg Base,
2193 SourceLocation OpLoc,
2194 tok::TokenKind OpKind,
2195 SourceLocation ClassNameLoc,
2196 TypeTy *Ty,
2197 const CXXScopeSpec *SS) {
2198 if (SS && SS->isInvalid())
2199 return ExprError();
2200
2201 //FIXME: Preserve type source info.
2202 QualType ConvType = GetTypeFromParser(Ty);
2203 CanQualType ConvTypeCanon = Context.getCanonicalType(ConvType);
2204 DeclarationName ConvName =
2205 Context.DeclarationNames.getCXXConversionFunctionName(ConvTypeCanon);
2206
2207 return BuildMemberReferenceExpr(S, move(Base), OpLoc, OpKind, ClassNameLoc,
2208 ConvName, DeclPtrTy(), SS);
2209}
2210
Fariborz Jahanianb7400232009-09-28 23:23:40 +00002211CXXMemberCallExpr *Sema::BuildCXXMemberCallExpr(Expr *Exp,
2212 CXXMethodDecl *Method) {
2213 MemberExpr *ME =
2214 new (Context) MemberExpr(Exp, /*IsArrow=*/false, Method,
2215 SourceLocation(), Method->getType());
2216 QualType ResultType;
2217 if (const CXXConversionDecl *Conv = dyn_cast<CXXConversionDecl>(Method))
2218 ResultType = Conv->getConversionType().getNonReferenceType();
2219 else
2220 ResultType = Method->getResultType().getNonReferenceType();
2221
2222 CXXMemberCallExpr *CE =
2223 new (Context) CXXMemberCallExpr(Context, ME, 0, 0,
2224 ResultType,
2225 SourceLocation());
2226 return CE;
2227}
2228
Anders Carlsson0aebc812009-09-09 21:33:21 +00002229Sema::OwningExprResult Sema::BuildCXXCastArgument(SourceLocation CastLoc,
2230 QualType Ty,
2231 CastExpr::CastKind Kind,
2232 CXXMethodDecl *Method,
2233 ExprArg Arg) {
2234 Expr *From = Arg.takeAs<Expr>();
2235
2236 switch (Kind) {
2237 default: assert(0 && "Unhandled cast kind!");
2238 case CastExpr::CK_ConstructorConversion: {
Douglas Gregor39da0b82009-09-09 23:08:42 +00002239 ASTOwningVector<&ActionBase::DeleteExpr> ConstructorArgs(*this);
2240
2241 if (CompleteConstructorCall(cast<CXXConstructorDecl>(Method),
2242 MultiExprArg(*this, (void **)&From, 1),
2243 CastLoc, ConstructorArgs))
2244 return ExprError();
Anders Carlsson4fa26842009-10-18 21:20:14 +00002245
2246 OwningExprResult Result =
2247 BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method),
2248 move_arg(ConstructorArgs));
2249 if (Result.isInvalid())
2250 return ExprError();
2251
2252 return MaybeBindToTemporary(Result.takeAs<Expr>());
Anders Carlsson0aebc812009-09-09 21:33:21 +00002253 }
2254
2255 case CastExpr::CK_UserDefinedConversion: {
Anders Carlssonaac6e3a2009-09-15 07:42:44 +00002256 assert(!From->getType()->isPointerType() && "Arg can't have pointer type!");
2257
2258 // Cast to base if needed.
2259 if (PerformObjectArgumentInitialization(From, Method))
2260 return ExprError();
2261
Fariborz Jahanianb7400232009-09-28 23:23:40 +00002262 // Create an implicit call expr that calls it.
2263 CXXMemberCallExpr *CE = BuildCXXMemberCallExpr(From, Method);
Anders Carlsson4fa26842009-10-18 21:20:14 +00002264 return MaybeBindToTemporary(CE);
Anders Carlsson0aebc812009-09-09 21:33:21 +00002265 }
Anders Carlsson0aebc812009-09-09 21:33:21 +00002266 }
2267}
2268
Anders Carlsson165a0a02009-05-17 18:41:29 +00002269Sema::OwningExprResult Sema::ActOnFinishFullExpr(ExprArg Arg) {
2270 Expr *FullExpr = Arg.takeAs<Expr>();
Anders Carlsson99ba36d2009-06-05 15:38:08 +00002271 if (FullExpr)
Mike Stump1eb44332009-09-09 15:08:12 +00002272 FullExpr = MaybeCreateCXXExprWithTemporaries(FullExpr,
Anders Carlssonf54741e2009-06-16 03:37:31 +00002273 /*ShouldDestroyTemps=*/true);
Anders Carlsson165a0a02009-05-17 18:41:29 +00002274
Anders Carlssonec773872009-08-25 23:46:41 +00002275
Anders Carlsson165a0a02009-05-17 18:41:29 +00002276 return Owned(FullExpr);
2277}