Expr.cpp revision 85bcd9920582f4d3879d8fbbaf4ca4fe09690160
1//===--- Expr.cpp - Expression AST Node Implementation --------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the Expr class and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/Expr.h" 15#include "clang/AST/ExprCXX.h" 16#include "clang/AST/APValue.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclCXX.h" 20#include "clang/AST/DeclTemplate.h" 21#include "clang/AST/RecordLayout.h" 22#include "clang/AST/StmtVisitor.h" 23#include "clang/Basic/Builtins.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/Support/ErrorHandling.h" 26#include "llvm/Support/raw_ostream.h" 27#include <algorithm> 28using namespace clang; 29 30/// isKnownToHaveBooleanValue - Return true if this is an integer expression 31/// that is known to return 0 or 1. This happens for _Bool/bool expressions 32/// but also int expressions which are produced by things like comparisons in 33/// C. 34bool Expr::isKnownToHaveBooleanValue() const { 35 // If this value has _Bool type, it is obvious 0/1. 36 if (getType()->isBooleanType()) return true; 37 // If this is a non-scalar-integer type, we don't care enough to try. 38 if (!getType()->isIntegralType()) return false; 39 40 if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) 41 return PE->getSubExpr()->isKnownToHaveBooleanValue(); 42 43 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(this)) { 44 switch (UO->getOpcode()) { 45 case UnaryOperator::Plus: 46 case UnaryOperator::Extension: 47 return UO->getSubExpr()->isKnownToHaveBooleanValue(); 48 default: 49 return false; 50 } 51 } 52 53 if (const CastExpr *CE = dyn_cast<CastExpr>(this)) 54 return CE->getSubExpr()->isKnownToHaveBooleanValue(); 55 56 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(this)) { 57 switch (BO->getOpcode()) { 58 default: return false; 59 case BinaryOperator::LT: // Relational operators. 60 case BinaryOperator::GT: 61 case BinaryOperator::LE: 62 case BinaryOperator::GE: 63 case BinaryOperator::EQ: // Equality operators. 64 case BinaryOperator::NE: 65 case BinaryOperator::LAnd: // AND operator. 66 case BinaryOperator::LOr: // Logical OR operator. 67 return true; 68 69 case BinaryOperator::And: // Bitwise AND operator. 70 case BinaryOperator::Xor: // Bitwise XOR operator. 71 case BinaryOperator::Or: // Bitwise OR operator. 72 // Handle things like (x==2)|(y==12). 73 return BO->getLHS()->isKnownToHaveBooleanValue() && 74 BO->getRHS()->isKnownToHaveBooleanValue(); 75 76 case BinaryOperator::Comma: 77 case BinaryOperator::Assign: 78 return BO->getRHS()->isKnownToHaveBooleanValue(); 79 } 80 } 81 82 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(this)) 83 return CO->getTrueExpr()->isKnownToHaveBooleanValue() && 84 CO->getFalseExpr()->isKnownToHaveBooleanValue(); 85 86 return false; 87} 88 89//===----------------------------------------------------------------------===// 90// Primary Expressions. 91//===----------------------------------------------------------------------===// 92 93void ExplicitTemplateArgumentList::initializeFrom( 94 const TemplateArgumentListInfo &Info) { 95 LAngleLoc = Info.getLAngleLoc(); 96 RAngleLoc = Info.getRAngleLoc(); 97 NumTemplateArgs = Info.size(); 98 99 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 100 for (unsigned i = 0; i != NumTemplateArgs; ++i) 101 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 102} 103 104void ExplicitTemplateArgumentList::copyInto( 105 TemplateArgumentListInfo &Info) const { 106 Info.setLAngleLoc(LAngleLoc); 107 Info.setRAngleLoc(RAngleLoc); 108 for (unsigned I = 0; I != NumTemplateArgs; ++I) 109 Info.addArgument(getTemplateArgs()[I]); 110} 111 112std::size_t ExplicitTemplateArgumentList::sizeFor( 113 const TemplateArgumentListInfo &Info) { 114 return sizeof(ExplicitTemplateArgumentList) + 115 sizeof(TemplateArgumentLoc) * Info.size(); 116} 117 118void DeclRefExpr::computeDependence() { 119 TypeDependent = false; 120 ValueDependent = false; 121 122 NamedDecl *D = getDecl(); 123 124 // (TD) C++ [temp.dep.expr]p3: 125 // An id-expression is type-dependent if it contains: 126 // 127 // and 128 // 129 // (VD) C++ [temp.dep.constexpr]p2: 130 // An identifier is value-dependent if it is: 131 132 // (TD) - an identifier that was declared with dependent type 133 // (VD) - a name declared with a dependent type, 134 if (getType()->isDependentType()) { 135 TypeDependent = true; 136 ValueDependent = true; 137 } 138 // (TD) - a conversion-function-id that specifies a dependent type 139 else if (D->getDeclName().getNameKind() 140 == DeclarationName::CXXConversionFunctionName && 141 D->getDeclName().getCXXNameType()->isDependentType()) { 142 TypeDependent = true; 143 ValueDependent = true; 144 } 145 // (TD) - a template-id that is dependent, 146 else if (hasExplicitTemplateArgumentList() && 147 TemplateSpecializationType::anyDependentTemplateArguments( 148 getTemplateArgs(), 149 getNumTemplateArgs())) { 150 TypeDependent = true; 151 ValueDependent = true; 152 } 153 // (VD) - the name of a non-type template parameter, 154 else if (isa<NonTypeTemplateParmDecl>(D)) 155 ValueDependent = true; 156 // (VD) - a constant with integral or enumeration type and is 157 // initialized with an expression that is value-dependent. 158 else if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 159 if (Var->getType()->isIntegralType() && 160 Var->getType().getCVRQualifiers() == Qualifiers::Const) { 161 if (const Expr *Init = Var->getAnyInitializer()) 162 if (Init->isValueDependent()) 163 ValueDependent = true; 164 } 165 // (VD) - FIXME: Missing from the standard: 166 // - a member function or a static data member of the current 167 // instantiation 168 else if (Var->isStaticDataMember() && 169 Var->getDeclContext()->isDependentContext()) 170 ValueDependent = true; 171 } 172 // (VD) - FIXME: Missing from the standard: 173 // - a member function or a static data member of the current 174 // instantiation 175 else if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) 176 ValueDependent = true; 177 // (TD) - a nested-name-specifier or a qualified-id that names a 178 // member of an unknown specialization. 179 // (handled by DependentScopeDeclRefExpr) 180} 181 182DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 183 SourceRange QualifierRange, 184 ValueDecl *D, SourceLocation NameLoc, 185 const TemplateArgumentListInfo *TemplateArgs, 186 QualType T) 187 : Expr(DeclRefExprClass, T, false, false), 188 DecoratedD(D, 189 (Qualifier? HasQualifierFlag : 0) | 190 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 191 Loc(NameLoc) { 192 if (Qualifier) { 193 NameQualifier *NQ = getNameQualifier(); 194 NQ->NNS = Qualifier; 195 NQ->Range = QualifierRange; 196 } 197 198 if (TemplateArgs) 199 getExplicitTemplateArgumentList()->initializeFrom(*TemplateArgs); 200 201 computeDependence(); 202} 203 204DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 205 NestedNameSpecifier *Qualifier, 206 SourceRange QualifierRange, 207 ValueDecl *D, 208 SourceLocation NameLoc, 209 QualType T, 210 const TemplateArgumentListInfo *TemplateArgs) { 211 std::size_t Size = sizeof(DeclRefExpr); 212 if (Qualifier != 0) 213 Size += sizeof(NameQualifier); 214 215 if (TemplateArgs) 216 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 217 218 void *Mem = Context.Allocate(Size, llvm::alignof<DeclRefExpr>()); 219 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameLoc, 220 TemplateArgs, T); 221} 222 223SourceRange DeclRefExpr::getSourceRange() const { 224 // FIXME: Does not handle multi-token names well, e.g., operator[]. 225 SourceRange R(Loc); 226 227 if (hasQualifier()) 228 R.setBegin(getQualifierRange().getBegin()); 229 if (hasExplicitTemplateArgumentList()) 230 R.setEnd(getRAngleLoc()); 231 return R; 232} 233 234// FIXME: Maybe this should use DeclPrinter with a special "print predefined 235// expr" policy instead. 236std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 237 ASTContext &Context = CurrentDecl->getASTContext(); 238 239 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 240 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 241 return FD->getNameAsString(); 242 243 llvm::SmallString<256> Name; 244 llvm::raw_svector_ostream Out(Name); 245 246 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 247 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 248 Out << "virtual "; 249 if (MD->isStatic()) 250 Out << "static "; 251 } 252 253 PrintingPolicy Policy(Context.getLangOptions()); 254 255 std::string Proto = FD->getQualifiedNameAsString(Policy); 256 257 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 258 const FunctionProtoType *FT = 0; 259 if (FD->hasWrittenPrototype()) 260 FT = dyn_cast<FunctionProtoType>(AFT); 261 262 Proto += "("; 263 if (FT) { 264 llvm::raw_string_ostream POut(Proto); 265 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 266 if (i) POut << ", "; 267 std::string Param; 268 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 269 POut << Param; 270 } 271 272 if (FT->isVariadic()) { 273 if (FD->getNumParams()) POut << ", "; 274 POut << "..."; 275 } 276 } 277 Proto += ")"; 278 279 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 280 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 281 if (ThisQuals.hasConst()) 282 Proto += " const"; 283 if (ThisQuals.hasVolatile()) 284 Proto += " volatile"; 285 } 286 287 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 288 AFT->getResultType().getAsStringInternal(Proto, Policy); 289 290 Out << Proto; 291 292 Out.flush(); 293 return Name.str().str(); 294 } 295 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 296 llvm::SmallString<256> Name; 297 llvm::raw_svector_ostream Out(Name); 298 Out << (MD->isInstanceMethod() ? '-' : '+'); 299 Out << '['; 300 301 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 302 // a null check to avoid a crash. 303 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 304 Out << ID; 305 306 if (const ObjCCategoryImplDecl *CID = 307 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 308 Out << '(' << CID << ')'; 309 310 Out << ' '; 311 Out << MD->getSelector().getAsString(); 312 Out << ']'; 313 314 Out.flush(); 315 return Name.str().str(); 316 } 317 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 318 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 319 return "top level"; 320 } 321 return ""; 322} 323 324/// getValueAsApproximateDouble - This returns the value as an inaccurate 325/// double. Note that this may cause loss of precision, but is useful for 326/// debugging dumps, etc. 327double FloatingLiteral::getValueAsApproximateDouble() const { 328 llvm::APFloat V = getValue(); 329 bool ignored; 330 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 331 &ignored); 332 return V.convertToDouble(); 333} 334 335StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 336 unsigned ByteLength, bool Wide, 337 QualType Ty, 338 const SourceLocation *Loc, 339 unsigned NumStrs) { 340 // Allocate enough space for the StringLiteral plus an array of locations for 341 // any concatenated string tokens. 342 void *Mem = C.Allocate(sizeof(StringLiteral)+ 343 sizeof(SourceLocation)*(NumStrs-1), 344 llvm::alignof<StringLiteral>()); 345 StringLiteral *SL = new (Mem) StringLiteral(Ty); 346 347 // OPTIMIZE: could allocate this appended to the StringLiteral. 348 char *AStrData = new (C, 1) char[ByteLength]; 349 memcpy(AStrData, StrData, ByteLength); 350 SL->StrData = AStrData; 351 SL->ByteLength = ByteLength; 352 SL->IsWide = Wide; 353 SL->TokLocs[0] = Loc[0]; 354 SL->NumConcatenated = NumStrs; 355 356 if (NumStrs != 1) 357 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 358 return SL; 359} 360 361StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 362 void *Mem = C.Allocate(sizeof(StringLiteral)+ 363 sizeof(SourceLocation)*(NumStrs-1), 364 llvm::alignof<StringLiteral>()); 365 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 366 SL->StrData = 0; 367 SL->ByteLength = 0; 368 SL->NumConcatenated = NumStrs; 369 return SL; 370} 371 372void StringLiteral::DoDestroy(ASTContext &C) { 373 C.Deallocate(const_cast<char*>(StrData)); 374 Expr::DoDestroy(C); 375} 376 377void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 378 if (StrData) 379 C.Deallocate(const_cast<char*>(StrData)); 380 381 char *AStrData = new (C, 1) char[Str.size()]; 382 memcpy(AStrData, Str.data(), Str.size()); 383 StrData = AStrData; 384 ByteLength = Str.size(); 385} 386 387/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 388/// corresponds to, e.g. "sizeof" or "[pre]++". 389const char *UnaryOperator::getOpcodeStr(Opcode Op) { 390 switch (Op) { 391 default: assert(0 && "Unknown unary operator"); 392 case PostInc: return "++"; 393 case PostDec: return "--"; 394 case PreInc: return "++"; 395 case PreDec: return "--"; 396 case AddrOf: return "&"; 397 case Deref: return "*"; 398 case Plus: return "+"; 399 case Minus: return "-"; 400 case Not: return "~"; 401 case LNot: return "!"; 402 case Real: return "__real"; 403 case Imag: return "__imag"; 404 case Extension: return "__extension__"; 405 case OffsetOf: return "__builtin_offsetof"; 406 } 407} 408 409UnaryOperator::Opcode 410UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 411 switch (OO) { 412 default: assert(false && "No unary operator for overloaded function"); 413 case OO_PlusPlus: return Postfix ? PostInc : PreInc; 414 case OO_MinusMinus: return Postfix ? PostDec : PreDec; 415 case OO_Amp: return AddrOf; 416 case OO_Star: return Deref; 417 case OO_Plus: return Plus; 418 case OO_Minus: return Minus; 419 case OO_Tilde: return Not; 420 case OO_Exclaim: return LNot; 421 } 422} 423 424OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 425 switch (Opc) { 426 case PostInc: case PreInc: return OO_PlusPlus; 427 case PostDec: case PreDec: return OO_MinusMinus; 428 case AddrOf: return OO_Amp; 429 case Deref: return OO_Star; 430 case Plus: return OO_Plus; 431 case Minus: return OO_Minus; 432 case Not: return OO_Tilde; 433 case LNot: return OO_Exclaim; 434 default: return OO_None; 435 } 436} 437 438 439//===----------------------------------------------------------------------===// 440// Postfix Operators. 441//===----------------------------------------------------------------------===// 442 443CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 444 unsigned numargs, QualType t, SourceLocation rparenloc) 445 : Expr(SC, t, 446 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 447 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 448 NumArgs(numargs) { 449 450 SubExprs = new (C) Stmt*[numargs+1]; 451 SubExprs[FN] = fn; 452 for (unsigned i = 0; i != numargs; ++i) 453 SubExprs[i+ARGS_START] = args[i]; 454 455 RParenLoc = rparenloc; 456} 457 458CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 459 QualType t, SourceLocation rparenloc) 460 : Expr(CallExprClass, t, 461 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 462 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 463 NumArgs(numargs) { 464 465 SubExprs = new (C) Stmt*[numargs+1]; 466 SubExprs[FN] = fn; 467 for (unsigned i = 0; i != numargs; ++i) 468 SubExprs[i+ARGS_START] = args[i]; 469 470 RParenLoc = rparenloc; 471} 472 473CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 474 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 475 SubExprs = new (C) Stmt*[1]; 476} 477 478void CallExpr::DoDestroy(ASTContext& C) { 479 DestroyChildren(C); 480 if (SubExprs) C.Deallocate(SubExprs); 481 this->~CallExpr(); 482 C.Deallocate(this); 483} 484 485Decl *CallExpr::getCalleeDecl() { 486 Expr *CEE = getCallee()->IgnoreParenCasts(); 487 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 488 return DRE->getDecl(); 489 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 490 return ME->getMemberDecl(); 491 492 return 0; 493} 494 495FunctionDecl *CallExpr::getDirectCallee() { 496 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 497} 498 499/// setNumArgs - This changes the number of arguments present in this call. 500/// Any orphaned expressions are deleted by this, and any new operands are set 501/// to null. 502void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 503 // No change, just return. 504 if (NumArgs == getNumArgs()) return; 505 506 // If shrinking # arguments, just delete the extras and forgot them. 507 if (NumArgs < getNumArgs()) { 508 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) 509 getArg(i)->Destroy(C); 510 this->NumArgs = NumArgs; 511 return; 512 } 513 514 // Otherwise, we are growing the # arguments. New an bigger argument array. 515 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 516 // Copy over args. 517 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 518 NewSubExprs[i] = SubExprs[i]; 519 // Null out new args. 520 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 521 NewSubExprs[i] = 0; 522 523 if (SubExprs) C.Deallocate(SubExprs); 524 SubExprs = NewSubExprs; 525 this->NumArgs = NumArgs; 526} 527 528/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 529/// not, return 0. 530unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 531 // All simple function calls (e.g. func()) are implicitly cast to pointer to 532 // function. As a result, we try and obtain the DeclRefExpr from the 533 // ImplicitCastExpr. 534 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 535 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 536 return 0; 537 538 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 539 if (!DRE) 540 return 0; 541 542 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 543 if (!FDecl) 544 return 0; 545 546 if (!FDecl->getIdentifier()) 547 return 0; 548 549 return FDecl->getBuiltinID(); 550} 551 552QualType CallExpr::getCallReturnType() const { 553 QualType CalleeType = getCallee()->getType(); 554 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 555 CalleeType = FnTypePtr->getPointeeType(); 556 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 557 CalleeType = BPT->getPointeeType(); 558 559 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 560 return FnType->getResultType(); 561} 562 563OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 564 SourceLocation OperatorLoc, 565 TypeSourceInfo *tsi, 566 OffsetOfNode* compsPtr, unsigned numComps, 567 Expr** exprsPtr, unsigned numExprs, 568 SourceLocation RParenLoc) { 569 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 570 sizeof(OffsetOfNode) * numComps + 571 sizeof(Expr*) * numExprs); 572 573 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 574 exprsPtr, numExprs, RParenLoc); 575} 576 577OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 578 unsigned numComps, unsigned numExprs) { 579 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 580 sizeof(OffsetOfNode) * numComps + 581 sizeof(Expr*) * numExprs); 582 return new (Mem) OffsetOfExpr(numComps, numExprs); 583} 584 585OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 586 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 587 OffsetOfNode* compsPtr, unsigned numComps, 588 Expr** exprsPtr, unsigned numExprs, 589 SourceLocation RParenLoc) 590 : Expr(OffsetOfExprClass, type, /*TypeDependent=*/false, 591 /*ValueDependent=*/tsi->getType()->isDependentType() || 592 hasAnyTypeDependentArguments(exprsPtr, numExprs) || 593 hasAnyValueDependentArguments(exprsPtr, numExprs)), 594 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 595 NumComps(numComps), NumExprs(numExprs) 596{ 597 for(unsigned i = 0; i < numComps; ++i) { 598 setComponent(i, compsPtr[i]); 599 } 600 601 for(unsigned i = 0; i < numExprs; ++i) { 602 setIndexExpr(i, exprsPtr[i]); 603 } 604} 605 606IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 607 assert(getKind() == Field || getKind() == Identifier); 608 if (getKind() == Field) 609 return getField()->getIdentifier(); 610 611 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 612} 613 614MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 615 NestedNameSpecifier *qual, 616 SourceRange qualrange, 617 ValueDecl *memberdecl, 618 DeclAccessPair founddecl, 619 SourceLocation l, 620 const TemplateArgumentListInfo *targs, 621 QualType ty) { 622 std::size_t Size = sizeof(MemberExpr); 623 624 bool hasQualOrFound = (qual != 0 || 625 founddecl.getDecl() != memberdecl || 626 founddecl.getAccess() != memberdecl->getAccess()); 627 if (hasQualOrFound) 628 Size += sizeof(MemberNameQualifier); 629 630 if (targs) 631 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 632 633 void *Mem = C.Allocate(Size, llvm::alignof<MemberExpr>()); 634 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, l, ty); 635 636 if (hasQualOrFound) { 637 if (qual && qual->isDependent()) { 638 E->setValueDependent(true); 639 E->setTypeDependent(true); 640 } 641 E->HasQualifierOrFoundDecl = true; 642 643 MemberNameQualifier *NQ = E->getMemberQualifier(); 644 NQ->NNS = qual; 645 NQ->Range = qualrange; 646 NQ->FoundDecl = founddecl; 647 } 648 649 if (targs) { 650 E->HasExplicitTemplateArgumentList = true; 651 E->getExplicitTemplateArgumentList()->initializeFrom(*targs); 652 } 653 654 return E; 655} 656 657const char *CastExpr::getCastKindName() const { 658 switch (getCastKind()) { 659 case CastExpr::CK_Unknown: 660 return "Unknown"; 661 case CastExpr::CK_BitCast: 662 return "BitCast"; 663 case CastExpr::CK_NoOp: 664 return "NoOp"; 665 case CastExpr::CK_BaseToDerived: 666 return "BaseToDerived"; 667 case CastExpr::CK_DerivedToBase: 668 return "DerivedToBase"; 669 case CastExpr::CK_UncheckedDerivedToBase: 670 return "UncheckedDerivedToBase"; 671 case CastExpr::CK_Dynamic: 672 return "Dynamic"; 673 case CastExpr::CK_ToUnion: 674 return "ToUnion"; 675 case CastExpr::CK_ArrayToPointerDecay: 676 return "ArrayToPointerDecay"; 677 case CastExpr::CK_FunctionToPointerDecay: 678 return "FunctionToPointerDecay"; 679 case CastExpr::CK_NullToMemberPointer: 680 return "NullToMemberPointer"; 681 case CastExpr::CK_BaseToDerivedMemberPointer: 682 return "BaseToDerivedMemberPointer"; 683 case CastExpr::CK_DerivedToBaseMemberPointer: 684 return "DerivedToBaseMemberPointer"; 685 case CastExpr::CK_UserDefinedConversion: 686 return "UserDefinedConversion"; 687 case CastExpr::CK_ConstructorConversion: 688 return "ConstructorConversion"; 689 case CastExpr::CK_IntegralToPointer: 690 return "IntegralToPointer"; 691 case CastExpr::CK_PointerToIntegral: 692 return "PointerToIntegral"; 693 case CastExpr::CK_ToVoid: 694 return "ToVoid"; 695 case CastExpr::CK_VectorSplat: 696 return "VectorSplat"; 697 case CastExpr::CK_IntegralCast: 698 return "IntegralCast"; 699 case CastExpr::CK_IntegralToFloating: 700 return "IntegralToFloating"; 701 case CastExpr::CK_FloatingToIntegral: 702 return "FloatingToIntegral"; 703 case CastExpr::CK_FloatingCast: 704 return "FloatingCast"; 705 case CastExpr::CK_MemberPointerToBoolean: 706 return "MemberPointerToBoolean"; 707 case CastExpr::CK_AnyPointerToObjCPointerCast: 708 return "AnyPointerToObjCPointerCast"; 709 case CastExpr::CK_AnyPointerToBlockPointerCast: 710 return "AnyPointerToBlockPointerCast"; 711 } 712 713 assert(0 && "Unhandled cast kind!"); 714 return 0; 715} 716 717void CastExpr::DoDestroy(ASTContext &C) 718{ 719 BasePath.Destroy(); 720 Expr::DoDestroy(C); 721} 722 723Expr *CastExpr::getSubExprAsWritten() { 724 Expr *SubExpr = 0; 725 CastExpr *E = this; 726 do { 727 SubExpr = E->getSubExpr(); 728 729 // Skip any temporary bindings; they're implicit. 730 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 731 SubExpr = Binder->getSubExpr(); 732 733 // Conversions by constructor and conversion functions have a 734 // subexpression describing the call; strip it off. 735 if (E->getCastKind() == CastExpr::CK_ConstructorConversion) 736 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 737 else if (E->getCastKind() == CastExpr::CK_UserDefinedConversion) 738 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 739 740 // If the subexpression we're left with is an implicit cast, look 741 // through that, too. 742 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 743 744 return SubExpr; 745} 746 747/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 748/// corresponds to, e.g. "<<=". 749const char *BinaryOperator::getOpcodeStr(Opcode Op) { 750 switch (Op) { 751 case PtrMemD: return ".*"; 752 case PtrMemI: return "->*"; 753 case Mul: return "*"; 754 case Div: return "/"; 755 case Rem: return "%"; 756 case Add: return "+"; 757 case Sub: return "-"; 758 case Shl: return "<<"; 759 case Shr: return ">>"; 760 case LT: return "<"; 761 case GT: return ">"; 762 case LE: return "<="; 763 case GE: return ">="; 764 case EQ: return "=="; 765 case NE: return "!="; 766 case And: return "&"; 767 case Xor: return "^"; 768 case Or: return "|"; 769 case LAnd: return "&&"; 770 case LOr: return "||"; 771 case Assign: return "="; 772 case MulAssign: return "*="; 773 case DivAssign: return "/="; 774 case RemAssign: return "%="; 775 case AddAssign: return "+="; 776 case SubAssign: return "-="; 777 case ShlAssign: return "<<="; 778 case ShrAssign: return ">>="; 779 case AndAssign: return "&="; 780 case XorAssign: return "^="; 781 case OrAssign: return "|="; 782 case Comma: return ","; 783 } 784 785 return ""; 786} 787 788BinaryOperator::Opcode 789BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 790 switch (OO) { 791 default: assert(false && "Not an overloadable binary operator"); 792 case OO_Plus: return Add; 793 case OO_Minus: return Sub; 794 case OO_Star: return Mul; 795 case OO_Slash: return Div; 796 case OO_Percent: return Rem; 797 case OO_Caret: return Xor; 798 case OO_Amp: return And; 799 case OO_Pipe: return Or; 800 case OO_Equal: return Assign; 801 case OO_Less: return LT; 802 case OO_Greater: return GT; 803 case OO_PlusEqual: return AddAssign; 804 case OO_MinusEqual: return SubAssign; 805 case OO_StarEqual: return MulAssign; 806 case OO_SlashEqual: return DivAssign; 807 case OO_PercentEqual: return RemAssign; 808 case OO_CaretEqual: return XorAssign; 809 case OO_AmpEqual: return AndAssign; 810 case OO_PipeEqual: return OrAssign; 811 case OO_LessLess: return Shl; 812 case OO_GreaterGreater: return Shr; 813 case OO_LessLessEqual: return ShlAssign; 814 case OO_GreaterGreaterEqual: return ShrAssign; 815 case OO_EqualEqual: return EQ; 816 case OO_ExclaimEqual: return NE; 817 case OO_LessEqual: return LE; 818 case OO_GreaterEqual: return GE; 819 case OO_AmpAmp: return LAnd; 820 case OO_PipePipe: return LOr; 821 case OO_Comma: return Comma; 822 case OO_ArrowStar: return PtrMemI; 823 } 824} 825 826OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 827 static const OverloadedOperatorKind OverOps[] = { 828 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 829 OO_Star, OO_Slash, OO_Percent, 830 OO_Plus, OO_Minus, 831 OO_LessLess, OO_GreaterGreater, 832 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 833 OO_EqualEqual, OO_ExclaimEqual, 834 OO_Amp, 835 OO_Caret, 836 OO_Pipe, 837 OO_AmpAmp, 838 OO_PipePipe, 839 OO_Equal, OO_StarEqual, 840 OO_SlashEqual, OO_PercentEqual, 841 OO_PlusEqual, OO_MinusEqual, 842 OO_LessLessEqual, OO_GreaterGreaterEqual, 843 OO_AmpEqual, OO_CaretEqual, 844 OO_PipeEqual, 845 OO_Comma 846 }; 847 return OverOps[Opc]; 848} 849 850InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 851 Expr **initExprs, unsigned numInits, 852 SourceLocation rbraceloc) 853 : Expr(InitListExprClass, QualType(), false, false), 854 InitExprs(C, numInits), 855 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 856 UnionFieldInit(0), HadArrayRangeDesignator(false) 857{ 858 for (unsigned I = 0; I != numInits; ++I) { 859 if (initExprs[I]->isTypeDependent()) 860 TypeDependent = true; 861 if (initExprs[I]->isValueDependent()) 862 ValueDependent = true; 863 } 864 865 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 866} 867 868void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 869 if (NumInits > InitExprs.size()) 870 InitExprs.reserve(C, NumInits); 871} 872 873void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 874 for (unsigned Idx = NumInits, LastIdx = InitExprs.size(); 875 Idx < LastIdx; ++Idx) 876 InitExprs[Idx]->Destroy(C); 877 InitExprs.resize(C, NumInits, 0); 878} 879 880Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 881 if (Init >= InitExprs.size()) { 882 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 883 InitExprs.back() = expr; 884 return 0; 885 } 886 887 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 888 InitExprs[Init] = expr; 889 return Result; 890} 891 892/// getFunctionType - Return the underlying function type for this block. 893/// 894const FunctionType *BlockExpr::getFunctionType() const { 895 return getType()->getAs<BlockPointerType>()-> 896 getPointeeType()->getAs<FunctionType>(); 897} 898 899SourceLocation BlockExpr::getCaretLocation() const { 900 return TheBlock->getCaretLocation(); 901} 902const Stmt *BlockExpr::getBody() const { 903 return TheBlock->getBody(); 904} 905Stmt *BlockExpr::getBody() { 906 return TheBlock->getBody(); 907} 908 909 910//===----------------------------------------------------------------------===// 911// Generic Expression Routines 912//===----------------------------------------------------------------------===// 913 914/// isUnusedResultAWarning - Return true if this immediate expression should 915/// be warned about if the result is unused. If so, fill in Loc and Ranges 916/// with location to warn on and the source range[s] to report with the 917/// warning. 918bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 919 SourceRange &R2, ASTContext &Ctx) const { 920 // Don't warn if the expr is type dependent. The type could end up 921 // instantiating to void. 922 if (isTypeDependent()) 923 return false; 924 925 switch (getStmtClass()) { 926 default: 927 if (getType()->isVoidType()) 928 return false; 929 Loc = getExprLoc(); 930 R1 = getSourceRange(); 931 return true; 932 case ParenExprClass: 933 return cast<ParenExpr>(this)->getSubExpr()-> 934 isUnusedResultAWarning(Loc, R1, R2, Ctx); 935 case UnaryOperatorClass: { 936 const UnaryOperator *UO = cast<UnaryOperator>(this); 937 938 switch (UO->getOpcode()) { 939 default: break; 940 case UnaryOperator::PostInc: 941 case UnaryOperator::PostDec: 942 case UnaryOperator::PreInc: 943 case UnaryOperator::PreDec: // ++/-- 944 return false; // Not a warning. 945 case UnaryOperator::Deref: 946 // Dereferencing a volatile pointer is a side-effect. 947 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 948 return false; 949 break; 950 case UnaryOperator::Real: 951 case UnaryOperator::Imag: 952 // accessing a piece of a volatile complex is a side-effect. 953 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 954 .isVolatileQualified()) 955 return false; 956 break; 957 case UnaryOperator::Extension: 958 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 959 } 960 Loc = UO->getOperatorLoc(); 961 R1 = UO->getSubExpr()->getSourceRange(); 962 return true; 963 } 964 case BinaryOperatorClass: { 965 const BinaryOperator *BO = cast<BinaryOperator>(this); 966 switch (BO->getOpcode()) { 967 default: 968 break; 969 // Consider ',', '||', '&&' to have side effects if the LHS or RHS does. 970 case BinaryOperator::Comma: 971 // ((foo = <blah>), 0) is an idiom for hiding the result (and 972 // lvalue-ness) of an assignment written in a macro. 973 if (IntegerLiteral *IE = 974 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 975 if (IE->getValue() == 0) 976 return false; 977 case BinaryOperator::LAnd: 978 case BinaryOperator::LOr: 979 return (BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 980 BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 981 } 982 if (BO->isAssignmentOp()) 983 return false; 984 Loc = BO->getOperatorLoc(); 985 R1 = BO->getLHS()->getSourceRange(); 986 R2 = BO->getRHS()->getSourceRange(); 987 return true; 988 } 989 case CompoundAssignOperatorClass: 990 case VAArgExprClass: 991 return false; 992 993 case ConditionalOperatorClass: { 994 // The condition must be evaluated, but if either the LHS or RHS is a 995 // warning, warn about them. 996 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 997 if (Exp->getLHS() && 998 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 999 return true; 1000 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1001 } 1002 1003 case MemberExprClass: 1004 // If the base pointer or element is to a volatile pointer/field, accessing 1005 // it is a side effect. 1006 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1007 return false; 1008 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1009 R1 = SourceRange(Loc, Loc); 1010 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1011 return true; 1012 1013 case ArraySubscriptExprClass: 1014 // If the base pointer or element is to a volatile pointer/field, accessing 1015 // it is a side effect. 1016 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1017 return false; 1018 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1019 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1020 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1021 return true; 1022 1023 case CallExprClass: 1024 case CXXOperatorCallExprClass: 1025 case CXXMemberCallExprClass: { 1026 // If this is a direct call, get the callee. 1027 const CallExpr *CE = cast<CallExpr>(this); 1028 if (const Decl *FD = CE->getCalleeDecl()) { 1029 // If the callee has attribute pure, const, or warn_unused_result, warn 1030 // about it. void foo() { strlen("bar"); } should warn. 1031 // 1032 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1033 // updated to match for QoI. 1034 if (FD->getAttr<WarnUnusedResultAttr>() || 1035 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1036 Loc = CE->getCallee()->getLocStart(); 1037 R1 = CE->getCallee()->getSourceRange(); 1038 1039 if (unsigned NumArgs = CE->getNumArgs()) 1040 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1041 CE->getArg(NumArgs-1)->getLocEnd()); 1042 return true; 1043 } 1044 } 1045 return false; 1046 } 1047 1048 case CXXTemporaryObjectExprClass: 1049 case CXXConstructExprClass: 1050 return false; 1051 1052 case ObjCMessageExprClass: { 1053 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1054 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1055 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1056 Loc = getExprLoc(); 1057 return true; 1058 } 1059 return false; 1060 } 1061 1062 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 1063#if 0 1064 const ObjCImplicitSetterGetterRefExpr *Ref = 1065 cast<ObjCImplicitSetterGetterRefExpr>(this); 1066 // FIXME: We really want the location of the '.' here. 1067 Loc = Ref->getLocation(); 1068 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 1069 if (Ref->getBase()) 1070 R2 = Ref->getBase()->getSourceRange(); 1071#else 1072 Loc = getExprLoc(); 1073 R1 = getSourceRange(); 1074#endif 1075 return true; 1076 } 1077 case StmtExprClass: { 1078 // Statement exprs don't logically have side effects themselves, but are 1079 // sometimes used in macros in ways that give them a type that is unused. 1080 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1081 // however, if the result of the stmt expr is dead, we don't want to emit a 1082 // warning. 1083 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1084 if (!CS->body_empty()) 1085 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1086 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1087 1088 if (getType()->isVoidType()) 1089 return false; 1090 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1091 R1 = getSourceRange(); 1092 return true; 1093 } 1094 case CStyleCastExprClass: 1095 // If this is an explicit cast to void, allow it. People do this when they 1096 // think they know what they're doing :). 1097 if (getType()->isVoidType()) 1098 return false; 1099 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1100 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1101 return true; 1102 case CXXFunctionalCastExprClass: { 1103 if (getType()->isVoidType()) 1104 return false; 1105 const CastExpr *CE = cast<CastExpr>(this); 1106 1107 // If this is a cast to void or a constructor conversion, check the operand. 1108 // Otherwise, the result of the cast is unused. 1109 if (CE->getCastKind() == CastExpr::CK_ToVoid || 1110 CE->getCastKind() == CastExpr::CK_ConstructorConversion) 1111 return (cast<CastExpr>(this)->getSubExpr() 1112 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1113 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1114 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1115 return true; 1116 } 1117 1118 case ImplicitCastExprClass: 1119 // Check the operand, since implicit casts are inserted by Sema 1120 return (cast<ImplicitCastExpr>(this) 1121 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1122 1123 case CXXDefaultArgExprClass: 1124 return (cast<CXXDefaultArgExpr>(this) 1125 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1126 1127 case CXXNewExprClass: 1128 // FIXME: In theory, there might be new expressions that don't have side 1129 // effects (e.g. a placement new with an uninitialized POD). 1130 case CXXDeleteExprClass: 1131 return false; 1132 case CXXBindTemporaryExprClass: 1133 return (cast<CXXBindTemporaryExpr>(this) 1134 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1135 case CXXExprWithTemporariesClass: 1136 return (cast<CXXExprWithTemporaries>(this) 1137 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1138 } 1139} 1140 1141/// DeclCanBeLvalue - Determine whether the given declaration can be 1142/// an lvalue. This is a helper routine for isLvalue. 1143static bool DeclCanBeLvalue(const NamedDecl *Decl, ASTContext &Ctx) { 1144 // C++ [temp.param]p6: 1145 // A non-type non-reference template-parameter is not an lvalue. 1146 if (const NonTypeTemplateParmDecl *NTTParm 1147 = dyn_cast<NonTypeTemplateParmDecl>(Decl)) 1148 return NTTParm->getType()->isReferenceType(); 1149 1150 return isa<VarDecl>(Decl) || isa<FieldDecl>(Decl) || 1151 // C++ 3.10p2: An lvalue refers to an object or function. 1152 (Ctx.getLangOptions().CPlusPlus && 1153 (isa<FunctionDecl>(Decl) || isa<FunctionTemplateDecl>(Decl))); 1154} 1155 1156/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 1157/// incomplete type other than void. Nonarray expressions that can be lvalues: 1158/// - name, where name must be a variable 1159/// - e[i] 1160/// - (e), where e must be an lvalue 1161/// - e.name, where e must be an lvalue 1162/// - e->name 1163/// - *e, the type of e cannot be a function type 1164/// - string-constant 1165/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 1166/// - reference type [C++ [expr]] 1167/// 1168Expr::isLvalueResult Expr::isLvalue(ASTContext &Ctx) const { 1169 assert(!TR->isReferenceType() && "Expressions can't have reference type."); 1170 1171 isLvalueResult Res = isLvalueInternal(Ctx); 1172 if (Res != LV_Valid || Ctx.getLangOptions().CPlusPlus) 1173 return Res; 1174 1175 // first, check the type (C99 6.3.2.1). Expressions with function 1176 // type in C are not lvalues, but they can be lvalues in C++. 1177 if (TR->isFunctionType() || TR == Ctx.OverloadTy) 1178 return LV_NotObjectType; 1179 1180 // Allow qualified void which is an incomplete type other than void (yuck). 1181 if (TR->isVoidType() && !Ctx.getCanonicalType(TR).hasQualifiers()) 1182 return LV_IncompleteVoidType; 1183 1184 return LV_Valid; 1185} 1186 1187// Check whether the expression can be sanely treated like an l-value 1188Expr::isLvalueResult Expr::isLvalueInternal(ASTContext &Ctx) const { 1189 switch (getStmtClass()) { 1190 case ObjCIsaExprClass: 1191 case StringLiteralClass: // C99 6.5.1p4 1192 case ObjCEncodeExprClass: // @encode behaves like its string in every way. 1193 return LV_Valid; 1194 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 1195 // For vectors, make sure base is an lvalue (i.e. not a function call). 1196 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 1197 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(Ctx); 1198 return LV_Valid; 1199 case DeclRefExprClass: { // C99 6.5.1p2 1200 const NamedDecl *RefdDecl = cast<DeclRefExpr>(this)->getDecl(); 1201 if (DeclCanBeLvalue(RefdDecl, Ctx)) 1202 return LV_Valid; 1203 break; 1204 } 1205 case BlockDeclRefExprClass: { 1206 const BlockDeclRefExpr *BDR = cast<BlockDeclRefExpr>(this); 1207 if (isa<VarDecl>(BDR->getDecl())) 1208 return LV_Valid; 1209 break; 1210 } 1211 case MemberExprClass: { 1212 const MemberExpr *m = cast<MemberExpr>(this); 1213 if (Ctx.getLangOptions().CPlusPlus) { // C++ [expr.ref]p4: 1214 NamedDecl *Member = m->getMemberDecl(); 1215 // C++ [expr.ref]p4: 1216 // If E2 is declared to have type "reference to T", then E1.E2 1217 // is an lvalue. 1218 if (ValueDecl *Value = dyn_cast<ValueDecl>(Member)) 1219 if (Value->getType()->isReferenceType()) 1220 return LV_Valid; 1221 1222 // -- If E2 is a static data member [...] then E1.E2 is an lvalue. 1223 if (isa<VarDecl>(Member) && Member->getDeclContext()->isRecord()) 1224 return LV_Valid; 1225 1226 // -- If E2 is a non-static data member [...]. If E1 is an 1227 // lvalue, then E1.E2 is an lvalue. 1228 if (isa<FieldDecl>(Member)) { 1229 if (m->isArrow()) 1230 return LV_Valid; 1231 return m->getBase()->isLvalue(Ctx); 1232 } 1233 1234 // -- If it refers to a static member function [...], then 1235 // E1.E2 is an lvalue. 1236 // -- Otherwise, if E1.E2 refers to a non-static member 1237 // function [...], then E1.E2 is not an lvalue. 1238 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Member)) 1239 return Method->isStatic()? LV_Valid : LV_MemberFunction; 1240 1241 // -- If E2 is a member enumerator [...], the expression E1.E2 1242 // is not an lvalue. 1243 if (isa<EnumConstantDecl>(Member)) 1244 return LV_InvalidExpression; 1245 1246 // Not an lvalue. 1247 return LV_InvalidExpression; 1248 } 1249 1250 // C99 6.5.2.3p4 1251 if (m->isArrow()) 1252 return LV_Valid; 1253 Expr *BaseExp = m->getBase(); 1254 if (BaseExp->getStmtClass() == ObjCPropertyRefExprClass || 1255 BaseExp->getStmtClass() == ObjCImplicitSetterGetterRefExprClass) 1256 return LV_SubObjCPropertySetting; 1257 return 1258 BaseExp->isLvalue(Ctx); 1259 } 1260 case UnaryOperatorClass: 1261 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 1262 return LV_Valid; // C99 6.5.3p4 1263 1264 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 1265 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag || 1266 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Extension) 1267 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(Ctx); // GNU. 1268 1269 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.pre.incr]p1 1270 (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreInc || 1271 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::PreDec)) 1272 return LV_Valid; 1273 break; 1274 case ImplicitCastExprClass: 1275 if (cast<ImplicitCastExpr>(this)->isLvalueCast()) 1276 return LV_Valid; 1277 1278 // If this is a conversion to a class temporary, make a note of 1279 // that. 1280 if (Ctx.getLangOptions().CPlusPlus && getType()->isRecordType()) 1281 return LV_ClassTemporary; 1282 1283 break; 1284 case ParenExprClass: // C99 6.5.1p5 1285 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(Ctx); 1286 case BinaryOperatorClass: 1287 case CompoundAssignOperatorClass: { 1288 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 1289 1290 if (Ctx.getLangOptions().CPlusPlus && // C++ [expr.comma]p1 1291 BinOp->getOpcode() == BinaryOperator::Comma) 1292 return BinOp->getRHS()->isLvalue(Ctx); 1293 1294 // C++ [expr.mptr.oper]p6 1295 // The result of a .* expression is an lvalue only if its first operand is 1296 // an lvalue and its second operand is a pointer to data member. 1297 if (BinOp->getOpcode() == BinaryOperator::PtrMemD && 1298 !BinOp->getType()->isFunctionType()) 1299 return BinOp->getLHS()->isLvalue(Ctx); 1300 1301 // The result of an ->* expression is an lvalue only if its second operand 1302 // is a pointer to data member. 1303 if (BinOp->getOpcode() == BinaryOperator::PtrMemI && 1304 !BinOp->getType()->isFunctionType()) { 1305 QualType Ty = BinOp->getRHS()->getType(); 1306 if (Ty->isMemberPointerType() && !Ty->isMemberFunctionPointerType()) 1307 return LV_Valid; 1308 } 1309 1310 if (!BinOp->isAssignmentOp()) 1311 return LV_InvalidExpression; 1312 1313 if (Ctx.getLangOptions().CPlusPlus) 1314 // C++ [expr.ass]p1: 1315 // The result of an assignment operation [...] is an lvalue. 1316 return LV_Valid; 1317 1318 1319 // C99 6.5.16: 1320 // An assignment expression [...] is not an lvalue. 1321 return LV_InvalidExpression; 1322 } 1323 case CallExprClass: 1324 case CXXOperatorCallExprClass: 1325 case CXXMemberCallExprClass: { 1326 // C++0x [expr.call]p10 1327 // A function call is an lvalue if and only if the result type 1328 // is an lvalue reference. 1329 QualType ReturnType = cast<CallExpr>(this)->getCallReturnType(); 1330 if (ReturnType->isLValueReferenceType()) 1331 return LV_Valid; 1332 1333 // If the function is returning a class temporary, make a note of 1334 // that. 1335 if (Ctx.getLangOptions().CPlusPlus && ReturnType->isRecordType()) 1336 return LV_ClassTemporary; 1337 1338 break; 1339 } 1340 case CompoundLiteralExprClass: // C99 6.5.2.5p5 1341 // FIXME: Is this what we want in C++? 1342 return LV_Valid; 1343 case ChooseExprClass: 1344 // __builtin_choose_expr is an lvalue if the selected operand is. 1345 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx)->isLvalue(Ctx); 1346 case ExtVectorElementExprClass: 1347 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 1348 return LV_DuplicateVectorComponents; 1349 return LV_Valid; 1350 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 1351 return LV_Valid; 1352 case ObjCPropertyRefExprClass: // FIXME: check if read-only property. 1353 return LV_Valid; 1354 case ObjCImplicitSetterGetterRefExprClass: 1355 // FIXME: check if read-only property. 1356 return LV_Valid; 1357 case PredefinedExprClass: 1358 return LV_Valid; 1359 case UnresolvedLookupExprClass: 1360 case UnresolvedMemberExprClass: 1361 return LV_Valid; 1362 case CXXDefaultArgExprClass: 1363 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(Ctx); 1364 case CStyleCastExprClass: 1365 case CXXFunctionalCastExprClass: 1366 case CXXStaticCastExprClass: 1367 case CXXDynamicCastExprClass: 1368 case CXXReinterpretCastExprClass: 1369 case CXXConstCastExprClass: 1370 // The result of an explicit cast is an lvalue if the type we are 1371 // casting to is an lvalue reference type. See C++ [expr.cast]p1, 1372 // C++ [expr.static.cast]p2, C++ [expr.dynamic.cast]p2, 1373 // C++ [expr.reinterpret.cast]p1, C++ [expr.const.cast]p1. 1374 if (cast<ExplicitCastExpr>(this)->getTypeAsWritten()-> 1375 isLValueReferenceType()) 1376 return LV_Valid; 1377 1378 // If this is a conversion to a class temporary, make a note of 1379 // that. 1380 if (Ctx.getLangOptions().CPlusPlus && 1381 cast<ExplicitCastExpr>(this)->getTypeAsWritten()->isRecordType()) 1382 return LV_ClassTemporary; 1383 1384 break; 1385 case CXXTypeidExprClass: 1386 // C++ 5.2.8p1: The result of a typeid expression is an lvalue of ... 1387 return LV_Valid; 1388 case CXXBindTemporaryExprClass: 1389 return cast<CXXBindTemporaryExpr>(this)->getSubExpr()-> 1390 isLvalueInternal(Ctx); 1391 case CXXBindReferenceExprClass: 1392 // Something that's bound to a reference is always an lvalue. 1393 return LV_Valid; 1394 case ConditionalOperatorClass: { 1395 // Complicated handling is only for C++. 1396 if (!Ctx.getLangOptions().CPlusPlus) 1397 return LV_InvalidExpression; 1398 1399 // Sema should have taken care to ensure that a CXXTemporaryObjectExpr is 1400 // everywhere there's an object converted to an rvalue. Also, any other 1401 // casts should be wrapped by ImplicitCastExprs. There's just the special 1402 // case involving throws to work out. 1403 const ConditionalOperator *Cond = cast<ConditionalOperator>(this); 1404 Expr *True = Cond->getTrueExpr(); 1405 Expr *False = Cond->getFalseExpr(); 1406 // C++0x 5.16p2 1407 // If either the second or the third operand has type (cv) void, [...] 1408 // the result [...] is an rvalue. 1409 if (True->getType()->isVoidType() || False->getType()->isVoidType()) 1410 return LV_InvalidExpression; 1411 1412 // Both sides must be lvalues for the result to be an lvalue. 1413 if (True->isLvalue(Ctx) != LV_Valid || False->isLvalue(Ctx) != LV_Valid) 1414 return LV_InvalidExpression; 1415 1416 // That's it. 1417 return LV_Valid; 1418 } 1419 1420 case Expr::CXXExprWithTemporariesClass: 1421 return cast<CXXExprWithTemporaries>(this)->getSubExpr()->isLvalue(Ctx); 1422 1423 case Expr::ObjCMessageExprClass: 1424 if (const ObjCMethodDecl *Method 1425 = cast<ObjCMessageExpr>(this)->getMethodDecl()) 1426 if (Method->getResultType()->isLValueReferenceType()) 1427 return LV_Valid; 1428 break; 1429 1430 case Expr::CXXConstructExprClass: 1431 case Expr::CXXTemporaryObjectExprClass: 1432 case Expr::CXXZeroInitValueExprClass: 1433 return LV_ClassTemporary; 1434 1435 default: 1436 break; 1437 } 1438 return LV_InvalidExpression; 1439} 1440 1441/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 1442/// does not have an incomplete type, does not have a const-qualified type, and 1443/// if it is a structure or union, does not have any member (including, 1444/// recursively, any member or element of all contained aggregates or unions) 1445/// with a const-qualified type. 1446Expr::isModifiableLvalueResult 1447Expr::isModifiableLvalue(ASTContext &Ctx, SourceLocation *Loc) const { 1448 isLvalueResult lvalResult = isLvalue(Ctx); 1449 1450 switch (lvalResult) { 1451 case LV_Valid: 1452 // C++ 3.10p11: Functions cannot be modified, but pointers to 1453 // functions can be modifiable. 1454 if (Ctx.getLangOptions().CPlusPlus && TR->isFunctionType()) 1455 return MLV_NotObjectType; 1456 break; 1457 1458 case LV_NotObjectType: return MLV_NotObjectType; 1459 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 1460 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 1461 case LV_InvalidExpression: 1462 // If the top level is a C-style cast, and the subexpression is a valid 1463 // lvalue, then this is probably a use of the old-school "cast as lvalue" 1464 // GCC extension. We don't support it, but we want to produce good 1465 // diagnostics when it happens so that the user knows why. 1466 if (const CStyleCastExpr *CE = dyn_cast<CStyleCastExpr>(IgnoreParens())) { 1467 if (CE->getSubExpr()->isLvalue(Ctx) == LV_Valid) { 1468 if (Loc) 1469 *Loc = CE->getLParenLoc(); 1470 return MLV_LValueCast; 1471 } 1472 } 1473 return MLV_InvalidExpression; 1474 case LV_MemberFunction: return MLV_MemberFunction; 1475 case LV_SubObjCPropertySetting: return MLV_SubObjCPropertySetting; 1476 case LV_ClassTemporary: 1477 return MLV_ClassTemporary; 1478 } 1479 1480 // The following is illegal: 1481 // void takeclosure(void (^C)(void)); 1482 // void func() { int x = 1; takeclosure(^{ x = 7; }); } 1483 // 1484 if (const BlockDeclRefExpr *BDR = dyn_cast<BlockDeclRefExpr>(this)) { 1485 if (!BDR->isByRef() && isa<VarDecl>(BDR->getDecl())) 1486 return MLV_NotBlockQualified; 1487 } 1488 1489 // Assigning to an 'implicit' property? 1490 if (const ObjCImplicitSetterGetterRefExpr* Expr = 1491 dyn_cast<ObjCImplicitSetterGetterRefExpr>(this)) { 1492 if (Expr->getSetterMethod() == 0) 1493 return MLV_NoSetterProperty; 1494 } 1495 1496 QualType CT = Ctx.getCanonicalType(getType()); 1497 1498 if (CT.isConstQualified()) 1499 return MLV_ConstQualified; 1500 if (CT->isArrayType()) 1501 return MLV_ArrayType; 1502 if (CT->isIncompleteType()) 1503 return MLV_IncompleteType; 1504 1505 if (const RecordType *r = CT->getAs<RecordType>()) { 1506 if (r->hasConstFields()) 1507 return MLV_ConstQualified; 1508 } 1509 1510 return MLV_Valid; 1511} 1512 1513/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1514/// returns true, if it is; false otherwise. 1515bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1516 switch (getStmtClass()) { 1517 default: 1518 return false; 1519 case ObjCIvarRefExprClass: 1520 return true; 1521 case Expr::UnaryOperatorClass: 1522 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1523 case ParenExprClass: 1524 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1525 case ImplicitCastExprClass: 1526 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1527 case CStyleCastExprClass: 1528 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1529 case DeclRefExprClass: { 1530 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1531 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1532 if (VD->hasGlobalStorage()) 1533 return true; 1534 QualType T = VD->getType(); 1535 // dereferencing to a pointer is always a gc'able candidate, 1536 // unless it is __weak. 1537 return T->isPointerType() && 1538 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1539 } 1540 return false; 1541 } 1542 case MemberExprClass: { 1543 const MemberExpr *M = cast<MemberExpr>(this); 1544 return M->getBase()->isOBJCGCCandidate(Ctx); 1545 } 1546 case ArraySubscriptExprClass: 1547 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1548 } 1549} 1550Expr* Expr::IgnoreParens() { 1551 Expr* E = this; 1552 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1553 E = P->getSubExpr(); 1554 1555 return E; 1556} 1557 1558/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1559/// or CastExprs or ImplicitCastExprs, returning their operand. 1560Expr *Expr::IgnoreParenCasts() { 1561 Expr *E = this; 1562 while (true) { 1563 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1564 E = P->getSubExpr(); 1565 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1566 E = P->getSubExpr(); 1567 else 1568 return E; 1569 } 1570} 1571 1572Expr *Expr::IgnoreParenImpCasts() { 1573 Expr *E = this; 1574 while (true) { 1575 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1576 E = P->getSubExpr(); 1577 else if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) 1578 E = P->getSubExpr(); 1579 else 1580 return E; 1581 } 1582} 1583 1584/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1585/// value (including ptr->int casts of the same size). Strip off any 1586/// ParenExpr or CastExprs, returning their operand. 1587Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1588 Expr *E = this; 1589 while (true) { 1590 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1591 E = P->getSubExpr(); 1592 continue; 1593 } 1594 1595 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1596 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1597 // ptr<->int casts of the same width. We also ignore all identify casts. 1598 Expr *SE = P->getSubExpr(); 1599 1600 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1601 E = SE; 1602 continue; 1603 } 1604 1605 if ((E->getType()->isPointerType() || E->getType()->isIntegralType()) && 1606 (SE->getType()->isPointerType() || SE->getType()->isIntegralType()) && 1607 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1608 E = SE; 1609 continue; 1610 } 1611 } 1612 1613 return E; 1614 } 1615} 1616 1617bool Expr::isDefaultArgument() const { 1618 const Expr *E = this; 1619 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1620 E = ICE->getSubExprAsWritten(); 1621 1622 return isa<CXXDefaultArgExpr>(E); 1623} 1624 1625/// \brief Skip over any no-op casts and any temporary-binding 1626/// expressions. 1627static const Expr *skipTemporaryBindingsAndNoOpCasts(const Expr *E) { 1628 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1629 if (ICE->getCastKind() == CastExpr::CK_NoOp) 1630 E = ICE->getSubExpr(); 1631 else 1632 break; 1633 } 1634 1635 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1636 E = BE->getSubExpr(); 1637 1638 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1639 if (ICE->getCastKind() == CastExpr::CK_NoOp) 1640 E = ICE->getSubExpr(); 1641 else 1642 break; 1643 } 1644 1645 return E; 1646} 1647 1648const Expr *Expr::getTemporaryObject() const { 1649 const Expr *E = skipTemporaryBindingsAndNoOpCasts(this); 1650 1651 // A cast can produce a temporary object. The object's construction 1652 // is represented as a CXXConstructExpr. 1653 if (const CastExpr *Cast = dyn_cast<CastExpr>(E)) { 1654 // Only user-defined and constructor conversions can produce 1655 // temporary objects. 1656 if (Cast->getCastKind() != CastExpr::CK_ConstructorConversion && 1657 Cast->getCastKind() != CastExpr::CK_UserDefinedConversion) 1658 return 0; 1659 1660 // Strip off temporary bindings and no-op casts. 1661 const Expr *Sub = skipTemporaryBindingsAndNoOpCasts(Cast->getSubExpr()); 1662 1663 // If this is a constructor conversion, see if we have an object 1664 // construction. 1665 if (Cast->getCastKind() == CastExpr::CK_ConstructorConversion) 1666 return dyn_cast<CXXConstructExpr>(Sub); 1667 1668 // If this is a user-defined conversion, see if we have a call to 1669 // a function that itself returns a temporary object. 1670 if (Cast->getCastKind() == CastExpr::CK_UserDefinedConversion) 1671 if (const CallExpr *CE = dyn_cast<CallExpr>(Sub)) 1672 if (CE->getCallReturnType()->isRecordType()) 1673 return CE; 1674 1675 return 0; 1676 } 1677 1678 // A call returning a class type returns a temporary. 1679 if (const CallExpr *CE = dyn_cast<CallExpr>(E)) { 1680 if (CE->getCallReturnType()->isRecordType()) 1681 return CE; 1682 1683 return 0; 1684 } 1685 1686 // Explicit temporary object constructors create temporaries. 1687 return dyn_cast<CXXTemporaryObjectExpr>(E); 1688} 1689 1690/// hasAnyTypeDependentArguments - Determines if any of the expressions 1691/// in Exprs is type-dependent. 1692bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1693 for (unsigned I = 0; I < NumExprs; ++I) 1694 if (Exprs[I]->isTypeDependent()) 1695 return true; 1696 1697 return false; 1698} 1699 1700/// hasAnyValueDependentArguments - Determines if any of the expressions 1701/// in Exprs is value-dependent. 1702bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1703 for (unsigned I = 0; I < NumExprs; ++I) 1704 if (Exprs[I]->isValueDependent()) 1705 return true; 1706 1707 return false; 1708} 1709 1710bool Expr::isConstantInitializer(ASTContext &Ctx) const { 1711 // This function is attempting whether an expression is an initializer 1712 // which can be evaluated at compile-time. isEvaluatable handles most 1713 // of the cases, but it can't deal with some initializer-specific 1714 // expressions, and it can't deal with aggregates; we deal with those here, 1715 // and fall back to isEvaluatable for the other cases. 1716 1717 // FIXME: This function assumes the variable being assigned to 1718 // isn't a reference type! 1719 1720 switch (getStmtClass()) { 1721 default: break; 1722 case StringLiteralClass: 1723 case ObjCStringLiteralClass: 1724 case ObjCEncodeExprClass: 1725 return true; 1726 case CompoundLiteralExprClass: { 1727 // This handles gcc's extension that allows global initializers like 1728 // "struct x {int x;} x = (struct x) {};". 1729 // FIXME: This accepts other cases it shouldn't! 1730 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1731 return Exp->isConstantInitializer(Ctx); 1732 } 1733 case InitListExprClass: { 1734 // FIXME: This doesn't deal with fields with reference types correctly. 1735 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1736 // to bitfields. 1737 const InitListExpr *Exp = cast<InitListExpr>(this); 1738 unsigned numInits = Exp->getNumInits(); 1739 for (unsigned i = 0; i < numInits; i++) { 1740 if (!Exp->getInit(i)->isConstantInitializer(Ctx)) 1741 return false; 1742 } 1743 return true; 1744 } 1745 case ImplicitValueInitExprClass: 1746 return true; 1747 case ParenExprClass: 1748 return cast<ParenExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1749 case UnaryOperatorClass: { 1750 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1751 if (Exp->getOpcode() == UnaryOperator::Extension) 1752 return Exp->getSubExpr()->isConstantInitializer(Ctx); 1753 break; 1754 } 1755 case BinaryOperatorClass: { 1756 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1757 // but this handles the common case. 1758 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1759 if (Exp->getOpcode() == BinaryOperator::Sub && 1760 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1761 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1762 return true; 1763 break; 1764 } 1765 case ImplicitCastExprClass: 1766 case CStyleCastExprClass: 1767 // Handle casts with a destination that's a struct or union; this 1768 // deals with both the gcc no-op struct cast extension and the 1769 // cast-to-union extension. 1770 if (getType()->isRecordType()) 1771 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1772 1773 // Integer->integer casts can be handled here, which is important for 1774 // things like (int)(&&x-&&y). Scary but true. 1775 if (getType()->isIntegerType() && 1776 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1777 return cast<CastExpr>(this)->getSubExpr()->isConstantInitializer(Ctx); 1778 1779 break; 1780 } 1781 return isEvaluatable(Ctx); 1782} 1783 1784/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1785/// integer constant expression with the value zero, or if this is one that is 1786/// cast to void*. 1787bool Expr::isNullPointerConstant(ASTContext &Ctx, 1788 NullPointerConstantValueDependence NPC) const { 1789 if (isValueDependent()) { 1790 switch (NPC) { 1791 case NPC_NeverValueDependent: 1792 assert(false && "Unexpected value dependent expression!"); 1793 // If the unthinkable happens, fall through to the safest alternative. 1794 1795 case NPC_ValueDependentIsNull: 1796 return isTypeDependent() || getType()->isIntegralType(); 1797 1798 case NPC_ValueDependentIsNotNull: 1799 return false; 1800 } 1801 } 1802 1803 // Strip off a cast to void*, if it exists. Except in C++. 1804 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1805 if (!Ctx.getLangOptions().CPlusPlus) { 1806 // Check that it is a cast to void*. 1807 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1808 QualType Pointee = PT->getPointeeType(); 1809 if (!Pointee.hasQualifiers() && 1810 Pointee->isVoidType() && // to void* 1811 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1812 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1813 } 1814 } 1815 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1816 // Ignore the ImplicitCastExpr type entirely. 1817 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1818 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1819 // Accept ((void*)0) as a null pointer constant, as many other 1820 // implementations do. 1821 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1822 } else if (const CXXDefaultArgExpr *DefaultArg 1823 = dyn_cast<CXXDefaultArgExpr>(this)) { 1824 // See through default argument expressions 1825 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1826 } else if (isa<GNUNullExpr>(this)) { 1827 // The GNU __null extension is always a null pointer constant. 1828 return true; 1829 } 1830 1831 // C++0x nullptr_t is always a null pointer constant. 1832 if (getType()->isNullPtrType()) 1833 return true; 1834 1835 // This expression must be an integer type. 1836 if (!getType()->isIntegerType() || 1837 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1838 return false; 1839 1840 // If we have an integer constant expression, we need to *evaluate* it and 1841 // test for the value 0. 1842 llvm::APSInt Result; 1843 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1844} 1845 1846FieldDecl *Expr::getBitField() { 1847 Expr *E = this->IgnoreParens(); 1848 1849 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1850 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 1851 E = ICE->getSubExpr()->IgnoreParens(); 1852 else 1853 break; 1854 } 1855 1856 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1857 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1858 if (Field->isBitField()) 1859 return Field; 1860 1861 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1862 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1863 return BinOp->getLHS()->getBitField(); 1864 1865 return 0; 1866} 1867 1868bool Expr::refersToVectorElement() const { 1869 const Expr *E = this->IgnoreParens(); 1870 1871 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1872 if (ICE->isLvalueCast() && ICE->getCastKind() == CastExpr::CK_NoOp) 1873 E = ICE->getSubExpr()->IgnoreParens(); 1874 else 1875 break; 1876 } 1877 1878 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 1879 return ASE->getBase()->getType()->isVectorType(); 1880 1881 if (isa<ExtVectorElementExpr>(E)) 1882 return true; 1883 1884 return false; 1885} 1886 1887/// isArrow - Return true if the base expression is a pointer to vector, 1888/// return false if the base expression is a vector. 1889bool ExtVectorElementExpr::isArrow() const { 1890 return getBase()->getType()->isPointerType(); 1891} 1892 1893unsigned ExtVectorElementExpr::getNumElements() const { 1894 if (const VectorType *VT = getType()->getAs<VectorType>()) 1895 return VT->getNumElements(); 1896 return 1; 1897} 1898 1899/// containsDuplicateElements - Return true if any element access is repeated. 1900bool ExtVectorElementExpr::containsDuplicateElements() const { 1901 // FIXME: Refactor this code to an accessor on the AST node which returns the 1902 // "type" of component access, and share with code below and in Sema. 1903 llvm::StringRef Comp = Accessor->getName(); 1904 1905 // Halving swizzles do not contain duplicate elements. 1906 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 1907 return false; 1908 1909 // Advance past s-char prefix on hex swizzles. 1910 if (Comp[0] == 's' || Comp[0] == 'S') 1911 Comp = Comp.substr(1); 1912 1913 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 1914 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 1915 return true; 1916 1917 return false; 1918} 1919 1920/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 1921void ExtVectorElementExpr::getEncodedElementAccess( 1922 llvm::SmallVectorImpl<unsigned> &Elts) const { 1923 llvm::StringRef Comp = Accessor->getName(); 1924 if (Comp[0] == 's' || Comp[0] == 'S') 1925 Comp = Comp.substr(1); 1926 1927 bool isHi = Comp == "hi"; 1928 bool isLo = Comp == "lo"; 1929 bool isEven = Comp == "even"; 1930 bool isOdd = Comp == "odd"; 1931 1932 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 1933 uint64_t Index; 1934 1935 if (isHi) 1936 Index = e + i; 1937 else if (isLo) 1938 Index = i; 1939 else if (isEven) 1940 Index = 2 * i; 1941 else if (isOdd) 1942 Index = 2 * i + 1; 1943 else 1944 Index = ExtVectorType::getAccessorIdx(Comp[i]); 1945 1946 Elts.push_back(Index); 1947 } 1948} 1949 1950ObjCMessageExpr::ObjCMessageExpr(QualType T, 1951 SourceLocation LBracLoc, 1952 SourceLocation SuperLoc, 1953 bool IsInstanceSuper, 1954 QualType SuperType, 1955 Selector Sel, 1956 ObjCMethodDecl *Method, 1957 Expr **Args, unsigned NumArgs, 1958 SourceLocation RBracLoc) 1959 : Expr(ObjCMessageExprClass, T, /*TypeDependent=*/false, 1960 /*ValueDependent=*/false), 1961 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 1962 HasMethod(Method != 0), SuperLoc(SuperLoc), 1963 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 1964 : Sel.getAsOpaquePtr())), 1965 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 1966{ 1967 setReceiverPointer(SuperType.getAsOpaquePtr()); 1968 if (NumArgs) 1969 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 1970} 1971 1972ObjCMessageExpr::ObjCMessageExpr(QualType T, 1973 SourceLocation LBracLoc, 1974 TypeSourceInfo *Receiver, 1975 Selector Sel, 1976 ObjCMethodDecl *Method, 1977 Expr **Args, unsigned NumArgs, 1978 SourceLocation RBracLoc) 1979 : Expr(ObjCMessageExprClass, T, T->isDependentType(), 1980 (T->isDependentType() || 1981 hasAnyValueDependentArguments(Args, NumArgs))), 1982 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 1983 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 1984 : Sel.getAsOpaquePtr())), 1985 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 1986{ 1987 setReceiverPointer(Receiver); 1988 if (NumArgs) 1989 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 1990} 1991 1992ObjCMessageExpr::ObjCMessageExpr(QualType T, 1993 SourceLocation LBracLoc, 1994 Expr *Receiver, 1995 Selector Sel, 1996 ObjCMethodDecl *Method, 1997 Expr **Args, unsigned NumArgs, 1998 SourceLocation RBracLoc) 1999 : Expr(ObjCMessageExprClass, T, Receiver->isTypeDependent(), 2000 (Receiver->isTypeDependent() || 2001 hasAnyValueDependentArguments(Args, NumArgs))), 2002 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2003 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2004 : Sel.getAsOpaquePtr())), 2005 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2006{ 2007 setReceiverPointer(Receiver); 2008 if (NumArgs) 2009 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2010} 2011 2012ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2013 SourceLocation LBracLoc, 2014 SourceLocation SuperLoc, 2015 bool IsInstanceSuper, 2016 QualType SuperType, 2017 Selector Sel, 2018 ObjCMethodDecl *Method, 2019 Expr **Args, unsigned NumArgs, 2020 SourceLocation RBracLoc) { 2021 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2022 NumArgs * sizeof(Expr *); 2023 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2024 return new (Mem) ObjCMessageExpr(T, LBracLoc, SuperLoc, IsInstanceSuper, 2025 SuperType, Sel, Method, Args, NumArgs, 2026 RBracLoc); 2027} 2028 2029ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2030 SourceLocation LBracLoc, 2031 TypeSourceInfo *Receiver, 2032 Selector Sel, 2033 ObjCMethodDecl *Method, 2034 Expr **Args, unsigned NumArgs, 2035 SourceLocation RBracLoc) { 2036 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2037 NumArgs * sizeof(Expr *); 2038 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2039 return new (Mem) ObjCMessageExpr(T, LBracLoc, Receiver, Sel, Method, Args, 2040 NumArgs, RBracLoc); 2041} 2042 2043ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2044 SourceLocation LBracLoc, 2045 Expr *Receiver, 2046 Selector Sel, 2047 ObjCMethodDecl *Method, 2048 Expr **Args, unsigned NumArgs, 2049 SourceLocation RBracLoc) { 2050 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2051 NumArgs * sizeof(Expr *); 2052 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2053 return new (Mem) ObjCMessageExpr(T, LBracLoc, Receiver, Sel, Method, Args, 2054 NumArgs, RBracLoc); 2055} 2056 2057ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2058 unsigned NumArgs) { 2059 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2060 NumArgs * sizeof(Expr *); 2061 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2062 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2063} 2064 2065Selector ObjCMessageExpr::getSelector() const { 2066 if (HasMethod) 2067 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2068 ->getSelector(); 2069 return Selector(SelectorOrMethod); 2070} 2071 2072ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2073 switch (getReceiverKind()) { 2074 case Instance: 2075 if (const ObjCObjectPointerType *Ptr 2076 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2077 return Ptr->getInterfaceDecl(); 2078 break; 2079 2080 case Class: 2081 if (const ObjCInterfaceType *Iface 2082 = getClassReceiver()->getAs<ObjCInterfaceType>()) 2083 return Iface->getDecl(); 2084 break; 2085 2086 case SuperInstance: 2087 if (const ObjCObjectPointerType *Ptr 2088 = getSuperType()->getAs<ObjCObjectPointerType>()) 2089 return Ptr->getInterfaceDecl(); 2090 break; 2091 2092 case SuperClass: 2093 if (const ObjCObjectPointerType *Iface 2094 = getSuperType()->getAs<ObjCObjectPointerType>()) 2095 return Iface->getInterfaceDecl(); 2096 break; 2097 } 2098 2099 return 0; 2100} 2101 2102bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2103 return getCond()->EvaluateAsInt(C) != 0; 2104} 2105 2106void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2107 unsigned NumExprs) { 2108 if (SubExprs) C.Deallocate(SubExprs); 2109 2110 SubExprs = new (C) Stmt* [NumExprs]; 2111 this->NumExprs = NumExprs; 2112 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2113} 2114 2115void ShuffleVectorExpr::DoDestroy(ASTContext& C) { 2116 DestroyChildren(C); 2117 if (SubExprs) C.Deallocate(SubExprs); 2118 this->~ShuffleVectorExpr(); 2119 C.Deallocate(this); 2120} 2121 2122void SizeOfAlignOfExpr::DoDestroy(ASTContext& C) { 2123 // Override default behavior of traversing children. If this has a type 2124 // operand and the type is a variable-length array, the child iteration 2125 // will iterate over the size expression. However, this expression belongs 2126 // to the type, not to this, so we don't want to delete it. 2127 // We still want to delete this expression. 2128 if (isArgumentType()) { 2129 this->~SizeOfAlignOfExpr(); 2130 C.Deallocate(this); 2131 } 2132 else 2133 Expr::DoDestroy(C); 2134} 2135 2136//===----------------------------------------------------------------------===// 2137// DesignatedInitExpr 2138//===----------------------------------------------------------------------===// 2139 2140IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2141 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2142 if (Field.NameOrField & 0x01) 2143 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2144 else 2145 return getField()->getIdentifier(); 2146} 2147 2148DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2149 unsigned NumDesignators, 2150 const Designator *Designators, 2151 SourceLocation EqualOrColonLoc, 2152 bool GNUSyntax, 2153 Expr **IndexExprs, 2154 unsigned NumIndexExprs, 2155 Expr *Init) 2156 : Expr(DesignatedInitExprClass, Ty, 2157 Init->isTypeDependent(), Init->isValueDependent()), 2158 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2159 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2160 this->Designators = new (C) Designator[NumDesignators]; 2161 2162 // Record the initializer itself. 2163 child_iterator Child = child_begin(); 2164 *Child++ = Init; 2165 2166 // Copy the designators and their subexpressions, computing 2167 // value-dependence along the way. 2168 unsigned IndexIdx = 0; 2169 for (unsigned I = 0; I != NumDesignators; ++I) { 2170 this->Designators[I] = Designators[I]; 2171 2172 if (this->Designators[I].isArrayDesignator()) { 2173 // Compute type- and value-dependence. 2174 Expr *Index = IndexExprs[IndexIdx]; 2175 ValueDependent = ValueDependent || 2176 Index->isTypeDependent() || Index->isValueDependent(); 2177 2178 // Copy the index expressions into permanent storage. 2179 *Child++ = IndexExprs[IndexIdx++]; 2180 } else if (this->Designators[I].isArrayRangeDesignator()) { 2181 // Compute type- and value-dependence. 2182 Expr *Start = IndexExprs[IndexIdx]; 2183 Expr *End = IndexExprs[IndexIdx + 1]; 2184 ValueDependent = ValueDependent || 2185 Start->isTypeDependent() || Start->isValueDependent() || 2186 End->isTypeDependent() || End->isValueDependent(); 2187 2188 // Copy the start/end expressions into permanent storage. 2189 *Child++ = IndexExprs[IndexIdx++]; 2190 *Child++ = IndexExprs[IndexIdx++]; 2191 } 2192 } 2193 2194 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2195} 2196 2197DesignatedInitExpr * 2198DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2199 unsigned NumDesignators, 2200 Expr **IndexExprs, unsigned NumIndexExprs, 2201 SourceLocation ColonOrEqualLoc, 2202 bool UsesColonSyntax, Expr *Init) { 2203 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2204 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2205 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2206 ColonOrEqualLoc, UsesColonSyntax, 2207 IndexExprs, NumIndexExprs, Init); 2208} 2209 2210DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2211 unsigned NumIndexExprs) { 2212 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2213 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2214 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2215} 2216 2217void DesignatedInitExpr::setDesignators(ASTContext &C, 2218 const Designator *Desigs, 2219 unsigned NumDesigs) { 2220 DestroyDesignators(C); 2221 2222 Designators = new (C) Designator[NumDesigs]; 2223 NumDesignators = NumDesigs; 2224 for (unsigned I = 0; I != NumDesigs; ++I) 2225 Designators[I] = Desigs[I]; 2226} 2227 2228SourceRange DesignatedInitExpr::getSourceRange() const { 2229 SourceLocation StartLoc; 2230 Designator &First = 2231 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2232 if (First.isFieldDesignator()) { 2233 if (GNUSyntax) 2234 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2235 else 2236 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2237 } else 2238 StartLoc = 2239 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2240 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2241} 2242 2243Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2244 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2245 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2246 Ptr += sizeof(DesignatedInitExpr); 2247 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2248 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2249} 2250 2251Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2252 assert(D.Kind == Designator::ArrayRangeDesignator && 2253 "Requires array range designator"); 2254 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2255 Ptr += sizeof(DesignatedInitExpr); 2256 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2257 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2258} 2259 2260Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2261 assert(D.Kind == Designator::ArrayRangeDesignator && 2262 "Requires array range designator"); 2263 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2264 Ptr += sizeof(DesignatedInitExpr); 2265 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2266 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2267} 2268 2269/// \brief Replaces the designator at index @p Idx with the series 2270/// of designators in [First, Last). 2271void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2272 const Designator *First, 2273 const Designator *Last) { 2274 unsigned NumNewDesignators = Last - First; 2275 if (NumNewDesignators == 0) { 2276 std::copy_backward(Designators + Idx + 1, 2277 Designators + NumDesignators, 2278 Designators + Idx); 2279 --NumNewDesignators; 2280 return; 2281 } else if (NumNewDesignators == 1) { 2282 Designators[Idx] = *First; 2283 return; 2284 } 2285 2286 Designator *NewDesignators 2287 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2288 std::copy(Designators, Designators + Idx, NewDesignators); 2289 std::copy(First, Last, NewDesignators + Idx); 2290 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2291 NewDesignators + Idx + NumNewDesignators); 2292 DestroyDesignators(C); 2293 Designators = NewDesignators; 2294 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2295} 2296 2297void DesignatedInitExpr::DoDestroy(ASTContext &C) { 2298 DestroyDesignators(C); 2299 Expr::DoDestroy(C); 2300} 2301 2302void DesignatedInitExpr::DestroyDesignators(ASTContext &C) { 2303 for (unsigned I = 0; I != NumDesignators; ++I) 2304 Designators[I].~Designator(); 2305 C.Deallocate(Designators); 2306 Designators = 0; 2307} 2308 2309ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2310 Expr **exprs, unsigned nexprs, 2311 SourceLocation rparenloc) 2312: Expr(ParenListExprClass, QualType(), 2313 hasAnyTypeDependentArguments(exprs, nexprs), 2314 hasAnyValueDependentArguments(exprs, nexprs)), 2315 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2316 2317 Exprs = new (C) Stmt*[nexprs]; 2318 for (unsigned i = 0; i != nexprs; ++i) 2319 Exprs[i] = exprs[i]; 2320} 2321 2322void ParenListExpr::DoDestroy(ASTContext& C) { 2323 DestroyChildren(C); 2324 if (Exprs) C.Deallocate(Exprs); 2325 this->~ParenListExpr(); 2326 C.Deallocate(this); 2327} 2328 2329//===----------------------------------------------------------------------===// 2330// ExprIterator. 2331//===----------------------------------------------------------------------===// 2332 2333Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2334Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2335Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2336const Expr* ConstExprIterator::operator[](size_t idx) const { 2337 return cast<Expr>(I[idx]); 2338} 2339const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2340const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2341 2342//===----------------------------------------------------------------------===// 2343// Child Iterators for iterating over subexpressions/substatements 2344//===----------------------------------------------------------------------===// 2345 2346// DeclRefExpr 2347Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2348Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2349 2350// ObjCIvarRefExpr 2351Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2352Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2353 2354// ObjCPropertyRefExpr 2355Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2356Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2357 2358// ObjCImplicitSetterGetterRefExpr 2359Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2360 // If this is accessing a class member, skip that entry. 2361 if (Base) return &Base; 2362 return &Base+1; 2363} 2364Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2365 return &Base+1; 2366} 2367 2368// ObjCSuperExpr 2369Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2370Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2371 2372// ObjCIsaExpr 2373Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2374Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2375 2376// PredefinedExpr 2377Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2378Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2379 2380// IntegerLiteral 2381Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2382Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2383 2384// CharacterLiteral 2385Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2386Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2387 2388// FloatingLiteral 2389Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2390Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2391 2392// ImaginaryLiteral 2393Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2394Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2395 2396// StringLiteral 2397Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2398Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2399 2400// ParenExpr 2401Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2402Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2403 2404// UnaryOperator 2405Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2406Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2407 2408// OffsetOfExpr 2409Stmt::child_iterator OffsetOfExpr::child_begin() { 2410 return reinterpret_cast<Stmt **> (reinterpret_cast<OffsetOfNode *> (this + 1) 2411 + NumComps); 2412} 2413Stmt::child_iterator OffsetOfExpr::child_end() { 2414 return child_iterator(&*child_begin() + NumExprs); 2415} 2416 2417// SizeOfAlignOfExpr 2418Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2419 // If this is of a type and the type is a VLA type (and not a typedef), the 2420 // size expression of the VLA needs to be treated as an executable expression. 2421 // Why isn't this weirdness documented better in StmtIterator? 2422 if (isArgumentType()) { 2423 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2424 getArgumentType().getTypePtr())) 2425 return child_iterator(T); 2426 return child_iterator(); 2427 } 2428 return child_iterator(&Argument.Ex); 2429} 2430Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2431 if (isArgumentType()) 2432 return child_iterator(); 2433 return child_iterator(&Argument.Ex + 1); 2434} 2435 2436// ArraySubscriptExpr 2437Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2438 return &SubExprs[0]; 2439} 2440Stmt::child_iterator ArraySubscriptExpr::child_end() { 2441 return &SubExprs[0]+END_EXPR; 2442} 2443 2444// CallExpr 2445Stmt::child_iterator CallExpr::child_begin() { 2446 return &SubExprs[0]; 2447} 2448Stmt::child_iterator CallExpr::child_end() { 2449 return &SubExprs[0]+NumArgs+ARGS_START; 2450} 2451 2452// MemberExpr 2453Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2454Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2455 2456// ExtVectorElementExpr 2457Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2458Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2459 2460// CompoundLiteralExpr 2461Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2462Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2463 2464// CastExpr 2465Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2466Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2467 2468// BinaryOperator 2469Stmt::child_iterator BinaryOperator::child_begin() { 2470 return &SubExprs[0]; 2471} 2472Stmt::child_iterator BinaryOperator::child_end() { 2473 return &SubExprs[0]+END_EXPR; 2474} 2475 2476// ConditionalOperator 2477Stmt::child_iterator ConditionalOperator::child_begin() { 2478 return &SubExprs[0]; 2479} 2480Stmt::child_iterator ConditionalOperator::child_end() { 2481 return &SubExprs[0]+END_EXPR; 2482} 2483 2484// AddrLabelExpr 2485Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2486Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2487 2488// StmtExpr 2489Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2490Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2491 2492// TypesCompatibleExpr 2493Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2494 return child_iterator(); 2495} 2496 2497Stmt::child_iterator TypesCompatibleExpr::child_end() { 2498 return child_iterator(); 2499} 2500 2501// ChooseExpr 2502Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2503Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2504 2505// GNUNullExpr 2506Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2507Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2508 2509// ShuffleVectorExpr 2510Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2511 return &SubExprs[0]; 2512} 2513Stmt::child_iterator ShuffleVectorExpr::child_end() { 2514 return &SubExprs[0]+NumExprs; 2515} 2516 2517// VAArgExpr 2518Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2519Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2520 2521// InitListExpr 2522Stmt::child_iterator InitListExpr::child_begin() { 2523 return InitExprs.size() ? &InitExprs[0] : 0; 2524} 2525Stmt::child_iterator InitListExpr::child_end() { 2526 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2527} 2528 2529// DesignatedInitExpr 2530Stmt::child_iterator DesignatedInitExpr::child_begin() { 2531 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2532 Ptr += sizeof(DesignatedInitExpr); 2533 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2534} 2535Stmt::child_iterator DesignatedInitExpr::child_end() { 2536 return child_iterator(&*child_begin() + NumSubExprs); 2537} 2538 2539// ImplicitValueInitExpr 2540Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2541 return child_iterator(); 2542} 2543 2544Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2545 return child_iterator(); 2546} 2547 2548// ParenListExpr 2549Stmt::child_iterator ParenListExpr::child_begin() { 2550 return &Exprs[0]; 2551} 2552Stmt::child_iterator ParenListExpr::child_end() { 2553 return &Exprs[0]+NumExprs; 2554} 2555 2556// ObjCStringLiteral 2557Stmt::child_iterator ObjCStringLiteral::child_begin() { 2558 return &String; 2559} 2560Stmt::child_iterator ObjCStringLiteral::child_end() { 2561 return &String+1; 2562} 2563 2564// ObjCEncodeExpr 2565Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2566Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2567 2568// ObjCSelectorExpr 2569Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2570 return child_iterator(); 2571} 2572Stmt::child_iterator ObjCSelectorExpr::child_end() { 2573 return child_iterator(); 2574} 2575 2576// ObjCProtocolExpr 2577Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2578 return child_iterator(); 2579} 2580Stmt::child_iterator ObjCProtocolExpr::child_end() { 2581 return child_iterator(); 2582} 2583 2584// ObjCMessageExpr 2585Stmt::child_iterator ObjCMessageExpr::child_begin() { 2586 if (getReceiverKind() == Instance) 2587 return reinterpret_cast<Stmt **>(this + 1); 2588 return getArgs(); 2589} 2590Stmt::child_iterator ObjCMessageExpr::child_end() { 2591 return getArgs() + getNumArgs(); 2592} 2593 2594// Blocks 2595Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2596Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2597 2598Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2599Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2600