Expr.cpp revision 9c5d70cee1fab3f988f9cd40316071b088a3f19d
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/Lex/LiteralSupport.h" 24#include "clang/Lex/Lexer.h" 25#include "clang/Basic/Builtins.h" 26#include "clang/Basic/SourceManager.h" 27#include "clang/Basic/TargetInfo.h" 28#include "llvm/Support/ErrorHandling.h" 29#include "llvm/Support/raw_ostream.h" 30#include <algorithm> 31using namespace clang; 32 33void Expr::ANCHOR() {} // key function for Expr class. 34 35/// isKnownToHaveBooleanValue - Return true if this is an integer expression 36/// that is known to return 0 or 1. This happens for _Bool/bool expressions 37/// but also int expressions which are produced by things like comparisons in 38/// C. 39bool Expr::isKnownToHaveBooleanValue() const { 40 // If this value has _Bool type, it is obvious 0/1. 41 if (getType()->isBooleanType()) return true; 42 // If this is a non-scalar-integer type, we don't care enough to try. 43 if (!getType()->isIntegralOrEnumerationType()) return false; 44 45 if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) 46 return PE->getSubExpr()->isKnownToHaveBooleanValue(); 47 48 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(this)) { 49 switch (UO->getOpcode()) { 50 case UO_Plus: 51 case UO_Extension: 52 return UO->getSubExpr()->isKnownToHaveBooleanValue(); 53 default: 54 return false; 55 } 56 } 57 58 // Only look through implicit casts. If the user writes 59 // '(int) (a && b)' treat it as an arbitrary int. 60 if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(this)) 61 return CE->getSubExpr()->isKnownToHaveBooleanValue(); 62 63 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(this)) { 64 switch (BO->getOpcode()) { 65 default: return false; 66 case BO_LT: // Relational operators. 67 case BO_GT: 68 case BO_LE: 69 case BO_GE: 70 case BO_EQ: // Equality operators. 71 case BO_NE: 72 case BO_LAnd: // AND operator. 73 case BO_LOr: // Logical OR operator. 74 return true; 75 76 case BO_And: // Bitwise AND operator. 77 case BO_Xor: // Bitwise XOR operator. 78 case BO_Or: // Bitwise OR operator. 79 // Handle things like (x==2)|(y==12). 80 return BO->getLHS()->isKnownToHaveBooleanValue() && 81 BO->getRHS()->isKnownToHaveBooleanValue(); 82 83 case BO_Comma: 84 case BO_Assign: 85 return BO->getRHS()->isKnownToHaveBooleanValue(); 86 } 87 } 88 89 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(this)) 90 return CO->getTrueExpr()->isKnownToHaveBooleanValue() && 91 CO->getFalseExpr()->isKnownToHaveBooleanValue(); 92 93 return false; 94} 95 96//===----------------------------------------------------------------------===// 97// Primary Expressions. 98//===----------------------------------------------------------------------===// 99 100void ExplicitTemplateArgumentList::initializeFrom( 101 const TemplateArgumentListInfo &Info) { 102 LAngleLoc = Info.getLAngleLoc(); 103 RAngleLoc = Info.getRAngleLoc(); 104 NumTemplateArgs = Info.size(); 105 106 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 107 for (unsigned i = 0; i != NumTemplateArgs; ++i) 108 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 109} 110 111void ExplicitTemplateArgumentList::copyInto( 112 TemplateArgumentListInfo &Info) const { 113 Info.setLAngleLoc(LAngleLoc); 114 Info.setRAngleLoc(RAngleLoc); 115 for (unsigned I = 0; I != NumTemplateArgs; ++I) 116 Info.addArgument(getTemplateArgs()[I]); 117} 118 119std::size_t ExplicitTemplateArgumentList::sizeFor(unsigned NumTemplateArgs) { 120 return sizeof(ExplicitTemplateArgumentList) + 121 sizeof(TemplateArgumentLoc) * NumTemplateArgs; 122} 123 124std::size_t ExplicitTemplateArgumentList::sizeFor( 125 const TemplateArgumentListInfo &Info) { 126 return sizeFor(Info.size()); 127} 128 129void DeclRefExpr::computeDependence() { 130 ExprBits.TypeDependent = false; 131 ExprBits.ValueDependent = false; 132 133 NamedDecl *D = getDecl(); 134 135 // (TD) C++ [temp.dep.expr]p3: 136 // An id-expression is type-dependent if it contains: 137 // 138 // and 139 // 140 // (VD) C++ [temp.dep.constexpr]p2: 141 // An identifier is value-dependent if it is: 142 143 // (TD) - an identifier that was declared with dependent type 144 // (VD) - a name declared with a dependent type, 145 if (getType()->isDependentType()) { 146 ExprBits.TypeDependent = true; 147 ExprBits.ValueDependent = true; 148 } 149 // (TD) - a conversion-function-id that specifies a dependent type 150 else if (D->getDeclName().getNameKind() 151 == DeclarationName::CXXConversionFunctionName && 152 D->getDeclName().getCXXNameType()->isDependentType()) { 153 ExprBits.TypeDependent = true; 154 ExprBits.ValueDependent = true; 155 } 156 // (TD) - a template-id that is dependent, 157 else if (hasExplicitTemplateArgs() && 158 TemplateSpecializationType::anyDependentTemplateArguments( 159 getTemplateArgs(), 160 getNumTemplateArgs())) { 161 ExprBits.TypeDependent = true; 162 ExprBits.ValueDependent = true; 163 } 164 // (VD) - the name of a non-type template parameter, 165 else if (isa<NonTypeTemplateParmDecl>(D)) 166 ExprBits.ValueDependent = true; 167 // (VD) - a constant with integral or enumeration type and is 168 // initialized with an expression that is value-dependent. 169 else if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 170 if (Var->getType()->isIntegralOrEnumerationType() && 171 Var->getType().getCVRQualifiers() == Qualifiers::Const) { 172 if (const Expr *Init = Var->getAnyInitializer()) 173 if (Init->isValueDependent()) 174 ExprBits.ValueDependent = true; 175 } 176 // (VD) - FIXME: Missing from the standard: 177 // - a member function or a static data member of the current 178 // instantiation 179 else if (Var->isStaticDataMember() && 180 Var->getDeclContext()->isDependentContext()) 181 ExprBits.ValueDependent = true; 182 } 183 // (VD) - FIXME: Missing from the standard: 184 // - a member function or a static data member of the current 185 // instantiation 186 else if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) 187 ExprBits.ValueDependent = true; 188 // (TD) - a nested-name-specifier or a qualified-id that names a 189 // member of an unknown specialization. 190 // (handled by DependentScopeDeclRefExpr) 191} 192 193DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 194 SourceRange QualifierRange, 195 ValueDecl *D, SourceLocation NameLoc, 196 const TemplateArgumentListInfo *TemplateArgs, 197 QualType T, ExprValueKind VK) 198 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false), 199 DecoratedD(D, 200 (Qualifier? HasQualifierFlag : 0) | 201 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 202 Loc(NameLoc) { 203 if (Qualifier) { 204 NameQualifier *NQ = getNameQualifier(); 205 NQ->NNS = Qualifier; 206 NQ->Range = QualifierRange; 207 } 208 209 if (TemplateArgs) 210 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 211 212 computeDependence(); 213} 214 215DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 216 SourceRange QualifierRange, 217 ValueDecl *D, const DeclarationNameInfo &NameInfo, 218 const TemplateArgumentListInfo *TemplateArgs, 219 QualType T, ExprValueKind VK) 220 : Expr(DeclRefExprClass, T, VK, OK_Ordinary, false, false), 221 DecoratedD(D, 222 (Qualifier? HasQualifierFlag : 0) | 223 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 224 Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { 225 if (Qualifier) { 226 NameQualifier *NQ = getNameQualifier(); 227 NQ->NNS = Qualifier; 228 NQ->Range = QualifierRange; 229 } 230 231 if (TemplateArgs) 232 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 233 234 computeDependence(); 235} 236 237DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 238 NestedNameSpecifier *Qualifier, 239 SourceRange QualifierRange, 240 ValueDecl *D, 241 SourceLocation NameLoc, 242 QualType T, 243 ExprValueKind VK, 244 const TemplateArgumentListInfo *TemplateArgs) { 245 return Create(Context, Qualifier, QualifierRange, D, 246 DeclarationNameInfo(D->getDeclName(), NameLoc), 247 T, VK, TemplateArgs); 248} 249 250DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 251 NestedNameSpecifier *Qualifier, 252 SourceRange QualifierRange, 253 ValueDecl *D, 254 const DeclarationNameInfo &NameInfo, 255 QualType T, 256 ExprValueKind VK, 257 const TemplateArgumentListInfo *TemplateArgs) { 258 std::size_t Size = sizeof(DeclRefExpr); 259 if (Qualifier != 0) 260 Size += sizeof(NameQualifier); 261 262 if (TemplateArgs) 263 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 264 265 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 266 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameInfo, 267 TemplateArgs, T, VK); 268} 269 270DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, bool HasQualifier, 271 unsigned NumTemplateArgs) { 272 std::size_t Size = sizeof(DeclRefExpr); 273 if (HasQualifier) 274 Size += sizeof(NameQualifier); 275 276 if (NumTemplateArgs) 277 Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs); 278 279 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 280 return new (Mem) DeclRefExpr(EmptyShell()); 281} 282 283SourceRange DeclRefExpr::getSourceRange() const { 284 SourceRange R = getNameInfo().getSourceRange(); 285 if (hasQualifier()) 286 R.setBegin(getQualifierRange().getBegin()); 287 if (hasExplicitTemplateArgs()) 288 R.setEnd(getRAngleLoc()); 289 return R; 290} 291 292// FIXME: Maybe this should use DeclPrinter with a special "print predefined 293// expr" policy instead. 294std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 295 ASTContext &Context = CurrentDecl->getASTContext(); 296 297 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 298 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 299 return FD->getNameAsString(); 300 301 llvm::SmallString<256> Name; 302 llvm::raw_svector_ostream Out(Name); 303 304 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 305 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 306 Out << "virtual "; 307 if (MD->isStatic()) 308 Out << "static "; 309 } 310 311 PrintingPolicy Policy(Context.getLangOptions()); 312 313 std::string Proto = FD->getQualifiedNameAsString(Policy); 314 315 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 316 const FunctionProtoType *FT = 0; 317 if (FD->hasWrittenPrototype()) 318 FT = dyn_cast<FunctionProtoType>(AFT); 319 320 Proto += "("; 321 if (FT) { 322 llvm::raw_string_ostream POut(Proto); 323 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 324 if (i) POut << ", "; 325 std::string Param; 326 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 327 POut << Param; 328 } 329 330 if (FT->isVariadic()) { 331 if (FD->getNumParams()) POut << ", "; 332 POut << "..."; 333 } 334 } 335 Proto += ")"; 336 337 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 338 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 339 if (ThisQuals.hasConst()) 340 Proto += " const"; 341 if (ThisQuals.hasVolatile()) 342 Proto += " volatile"; 343 } 344 345 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 346 AFT->getResultType().getAsStringInternal(Proto, Policy); 347 348 Out << Proto; 349 350 Out.flush(); 351 return Name.str().str(); 352 } 353 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 354 llvm::SmallString<256> Name; 355 llvm::raw_svector_ostream Out(Name); 356 Out << (MD->isInstanceMethod() ? '-' : '+'); 357 Out << '['; 358 359 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 360 // a null check to avoid a crash. 361 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 362 Out << ID; 363 364 if (const ObjCCategoryImplDecl *CID = 365 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 366 Out << '(' << CID << ')'; 367 368 Out << ' '; 369 Out << MD->getSelector().getAsString(); 370 Out << ']'; 371 372 Out.flush(); 373 return Name.str().str(); 374 } 375 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 376 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 377 return "top level"; 378 } 379 return ""; 380} 381 382void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 383 if (hasAllocation()) 384 C.Deallocate(pVal); 385 386 BitWidth = Val.getBitWidth(); 387 unsigned NumWords = Val.getNumWords(); 388 const uint64_t* Words = Val.getRawData(); 389 if (NumWords > 1) { 390 pVal = new (C) uint64_t[NumWords]; 391 std::copy(Words, Words + NumWords, pVal); 392 } else if (NumWords == 1) 393 VAL = Words[0]; 394 else 395 VAL = 0; 396} 397 398IntegerLiteral * 399IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 400 QualType type, SourceLocation l) { 401 return new (C) IntegerLiteral(C, V, type, l); 402} 403 404IntegerLiteral * 405IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 406 return new (C) IntegerLiteral(Empty); 407} 408 409FloatingLiteral * 410FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 411 bool isexact, QualType Type, SourceLocation L) { 412 return new (C) FloatingLiteral(C, V, isexact, Type, L); 413} 414 415FloatingLiteral * 416FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 417 return new (C) FloatingLiteral(Empty); 418} 419 420/// getValueAsApproximateDouble - This returns the value as an inaccurate 421/// double. Note that this may cause loss of precision, but is useful for 422/// debugging dumps, etc. 423double FloatingLiteral::getValueAsApproximateDouble() const { 424 llvm::APFloat V = getValue(); 425 bool ignored; 426 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 427 &ignored); 428 return V.convertToDouble(); 429} 430 431StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 432 unsigned ByteLength, bool Wide, 433 QualType Ty, 434 const SourceLocation *Loc, 435 unsigned NumStrs) { 436 // Allocate enough space for the StringLiteral plus an array of locations for 437 // any concatenated string tokens. 438 void *Mem = C.Allocate(sizeof(StringLiteral)+ 439 sizeof(SourceLocation)*(NumStrs-1), 440 llvm::alignOf<StringLiteral>()); 441 StringLiteral *SL = new (Mem) StringLiteral(Ty); 442 443 // OPTIMIZE: could allocate this appended to the StringLiteral. 444 char *AStrData = new (C, 1) char[ByteLength]; 445 memcpy(AStrData, StrData, ByteLength); 446 SL->StrData = AStrData; 447 SL->ByteLength = ByteLength; 448 SL->IsWide = Wide; 449 SL->TokLocs[0] = Loc[0]; 450 SL->NumConcatenated = NumStrs; 451 452 if (NumStrs != 1) 453 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 454 return SL; 455} 456 457StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 458 void *Mem = C.Allocate(sizeof(StringLiteral)+ 459 sizeof(SourceLocation)*(NumStrs-1), 460 llvm::alignOf<StringLiteral>()); 461 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 462 SL->StrData = 0; 463 SL->ByteLength = 0; 464 SL->NumConcatenated = NumStrs; 465 return SL; 466} 467 468void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 469 char *AStrData = new (C, 1) char[Str.size()]; 470 memcpy(AStrData, Str.data(), Str.size()); 471 StrData = AStrData; 472 ByteLength = Str.size(); 473} 474 475/// getLocationOfByte - Return a source location that points to the specified 476/// byte of this string literal. 477/// 478/// Strings are amazingly complex. They can be formed from multiple tokens and 479/// can have escape sequences in them in addition to the usual trigraph and 480/// escaped newline business. This routine handles this complexity. 481/// 482SourceLocation StringLiteral:: 483getLocationOfByte(unsigned ByteNo, const SourceManager &SM, 484 const LangOptions &Features, const TargetInfo &Target) const { 485 assert(!isWide() && "This doesn't work for wide strings yet"); 486 487 // Loop over all of the tokens in this string until we find the one that 488 // contains the byte we're looking for. 489 unsigned TokNo = 0; 490 while (1) { 491 assert(TokNo < getNumConcatenated() && "Invalid byte number!"); 492 SourceLocation StrTokLoc = getStrTokenLoc(TokNo); 493 494 // Get the spelling of the string so that we can get the data that makes up 495 // the string literal, not the identifier for the macro it is potentially 496 // expanded through. 497 SourceLocation StrTokSpellingLoc = SM.getSpellingLoc(StrTokLoc); 498 499 // Re-lex the token to get its length and original spelling. 500 std::pair<FileID, unsigned> LocInfo =SM.getDecomposedLoc(StrTokSpellingLoc); 501 bool Invalid = false; 502 llvm::StringRef Buffer = SM.getBufferData(LocInfo.first, &Invalid); 503 if (Invalid) 504 return StrTokSpellingLoc; 505 506 const char *StrData = Buffer.data()+LocInfo.second; 507 508 // Create a langops struct and enable trigraphs. This is sufficient for 509 // relexing tokens. 510 LangOptions LangOpts; 511 LangOpts.Trigraphs = true; 512 513 // Create a lexer starting at the beginning of this token. 514 Lexer TheLexer(StrTokSpellingLoc, Features, Buffer.begin(), StrData, 515 Buffer.end()); 516 Token TheTok; 517 TheLexer.LexFromRawLexer(TheTok); 518 519 // Use the StringLiteralParser to compute the length of the string in bytes. 520 StringLiteralParser SLP(&TheTok, 1, SM, Features, Target); 521 unsigned TokNumBytes = SLP.GetStringLength(); 522 523 // If the byte is in this token, return the location of the byte. 524 if (ByteNo < TokNumBytes || 525 (ByteNo == TokNumBytes && TokNo == getNumConcatenated())) { 526 unsigned Offset = SLP.getOffsetOfStringByte(TheTok, ByteNo); 527 528 // Now that we know the offset of the token in the spelling, use the 529 // preprocessor to get the offset in the original source. 530 return Lexer::AdvanceToTokenCharacter(StrTokLoc, Offset, SM, Features); 531 } 532 533 // Move to the next string token. 534 ++TokNo; 535 ByteNo -= TokNumBytes; 536 } 537} 538 539 540 541/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 542/// corresponds to, e.g. "sizeof" or "[pre]++". 543const char *UnaryOperator::getOpcodeStr(Opcode Op) { 544 switch (Op) { 545 default: assert(0 && "Unknown unary operator"); 546 case UO_PostInc: return "++"; 547 case UO_PostDec: return "--"; 548 case UO_PreInc: return "++"; 549 case UO_PreDec: return "--"; 550 case UO_AddrOf: return "&"; 551 case UO_Deref: return "*"; 552 case UO_Plus: return "+"; 553 case UO_Minus: return "-"; 554 case UO_Not: return "~"; 555 case UO_LNot: return "!"; 556 case UO_Real: return "__real"; 557 case UO_Imag: return "__imag"; 558 case UO_Extension: return "__extension__"; 559 } 560} 561 562UnaryOperatorKind 563UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 564 switch (OO) { 565 default: assert(false && "No unary operator for overloaded function"); 566 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 567 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 568 case OO_Amp: return UO_AddrOf; 569 case OO_Star: return UO_Deref; 570 case OO_Plus: return UO_Plus; 571 case OO_Minus: return UO_Minus; 572 case OO_Tilde: return UO_Not; 573 case OO_Exclaim: return UO_LNot; 574 } 575} 576 577OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 578 switch (Opc) { 579 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 580 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 581 case UO_AddrOf: return OO_Amp; 582 case UO_Deref: return OO_Star; 583 case UO_Plus: return OO_Plus; 584 case UO_Minus: return OO_Minus; 585 case UO_Not: return OO_Tilde; 586 case UO_LNot: return OO_Exclaim; 587 default: return OO_None; 588 } 589} 590 591 592//===----------------------------------------------------------------------===// 593// Postfix Operators. 594//===----------------------------------------------------------------------===// 595 596CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 597 unsigned numargs, QualType t, ExprValueKind VK, 598 SourceLocation rparenloc) 599 : Expr(SC, t, VK, OK_Ordinary, 600 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 601 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 602 NumArgs(numargs) { 603 604 SubExprs = new (C) Stmt*[numargs+1]; 605 SubExprs[FN] = fn; 606 for (unsigned i = 0; i != numargs; ++i) 607 SubExprs[i+ARGS_START] = args[i]; 608 609 RParenLoc = rparenloc; 610} 611 612CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 613 QualType t, ExprValueKind VK, SourceLocation rparenloc) 614 : Expr(CallExprClass, t, VK, OK_Ordinary, 615 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 616 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 617 NumArgs(numargs) { 618 619 SubExprs = new (C) Stmt*[numargs+1]; 620 SubExprs[FN] = fn; 621 for (unsigned i = 0; i != numargs; ++i) 622 SubExprs[i+ARGS_START] = args[i]; 623 624 RParenLoc = rparenloc; 625} 626 627CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 628 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 629 SubExprs = new (C) Stmt*[1]; 630} 631 632Decl *CallExpr::getCalleeDecl() { 633 Expr *CEE = getCallee()->IgnoreParenCasts(); 634 // If we're calling a dereference, look at the pointer instead. 635 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 636 if (BO->isPtrMemOp()) 637 CEE = BO->getRHS()->IgnoreParenCasts(); 638 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 639 if (UO->getOpcode() == UO_Deref) 640 CEE = UO->getSubExpr()->IgnoreParenCasts(); 641 } 642 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 643 return DRE->getDecl(); 644 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 645 return ME->getMemberDecl(); 646 647 return 0; 648} 649 650FunctionDecl *CallExpr::getDirectCallee() { 651 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 652} 653 654/// setNumArgs - This changes the number of arguments present in this call. 655/// Any orphaned expressions are deleted by this, and any new operands are set 656/// to null. 657void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 658 // No change, just return. 659 if (NumArgs == getNumArgs()) return; 660 661 // If shrinking # arguments, just delete the extras and forgot them. 662 if (NumArgs < getNumArgs()) { 663 this->NumArgs = NumArgs; 664 return; 665 } 666 667 // Otherwise, we are growing the # arguments. New an bigger argument array. 668 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 669 // Copy over args. 670 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 671 NewSubExprs[i] = SubExprs[i]; 672 // Null out new args. 673 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 674 NewSubExprs[i] = 0; 675 676 if (SubExprs) C.Deallocate(SubExprs); 677 SubExprs = NewSubExprs; 678 this->NumArgs = NumArgs; 679} 680 681/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 682/// not, return 0. 683unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 684 // All simple function calls (e.g. func()) are implicitly cast to pointer to 685 // function. As a result, we try and obtain the DeclRefExpr from the 686 // ImplicitCastExpr. 687 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 688 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 689 return 0; 690 691 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 692 if (!DRE) 693 return 0; 694 695 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 696 if (!FDecl) 697 return 0; 698 699 if (!FDecl->getIdentifier()) 700 return 0; 701 702 return FDecl->getBuiltinID(); 703} 704 705QualType CallExpr::getCallReturnType() const { 706 QualType CalleeType = getCallee()->getType(); 707 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 708 CalleeType = FnTypePtr->getPointeeType(); 709 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 710 CalleeType = BPT->getPointeeType(); 711 else if (const MemberPointerType *MPT 712 = CalleeType->getAs<MemberPointerType>()) 713 CalleeType = MPT->getPointeeType(); 714 715 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 716 return FnType->getResultType(); 717} 718 719OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 720 SourceLocation OperatorLoc, 721 TypeSourceInfo *tsi, 722 OffsetOfNode* compsPtr, unsigned numComps, 723 Expr** exprsPtr, unsigned numExprs, 724 SourceLocation RParenLoc) { 725 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 726 sizeof(OffsetOfNode) * numComps + 727 sizeof(Expr*) * numExprs); 728 729 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 730 exprsPtr, numExprs, RParenLoc); 731} 732 733OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 734 unsigned numComps, unsigned numExprs) { 735 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 736 sizeof(OffsetOfNode) * numComps + 737 sizeof(Expr*) * numExprs); 738 return new (Mem) OffsetOfExpr(numComps, numExprs); 739} 740 741OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 742 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 743 OffsetOfNode* compsPtr, unsigned numComps, 744 Expr** exprsPtr, unsigned numExprs, 745 SourceLocation RParenLoc) 746 : Expr(OffsetOfExprClass, type, VK_RValue, OK_Ordinary, 747 /*TypeDependent=*/false, 748 /*ValueDependent=*/tsi->getType()->isDependentType() || 749 hasAnyTypeDependentArguments(exprsPtr, numExprs) || 750 hasAnyValueDependentArguments(exprsPtr, numExprs)), 751 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 752 NumComps(numComps), NumExprs(numExprs) 753{ 754 for(unsigned i = 0; i < numComps; ++i) { 755 setComponent(i, compsPtr[i]); 756 } 757 758 for(unsigned i = 0; i < numExprs; ++i) { 759 setIndexExpr(i, exprsPtr[i]); 760 } 761} 762 763IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 764 assert(getKind() == Field || getKind() == Identifier); 765 if (getKind() == Field) 766 return getField()->getIdentifier(); 767 768 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 769} 770 771MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 772 NestedNameSpecifier *qual, 773 SourceRange qualrange, 774 ValueDecl *memberdecl, 775 DeclAccessPair founddecl, 776 DeclarationNameInfo nameinfo, 777 const TemplateArgumentListInfo *targs, 778 QualType ty, 779 ExprValueKind vk, 780 ExprObjectKind ok) { 781 std::size_t Size = sizeof(MemberExpr); 782 783 bool hasQualOrFound = (qual != 0 || 784 founddecl.getDecl() != memberdecl || 785 founddecl.getAccess() != memberdecl->getAccess()); 786 if (hasQualOrFound) 787 Size += sizeof(MemberNameQualifier); 788 789 if (targs) 790 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 791 792 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 793 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, 794 ty, vk, ok); 795 796 if (hasQualOrFound) { 797 if (qual && qual->isDependent()) { 798 E->setValueDependent(true); 799 E->setTypeDependent(true); 800 } 801 E->HasQualifierOrFoundDecl = true; 802 803 MemberNameQualifier *NQ = E->getMemberQualifier(); 804 NQ->NNS = qual; 805 NQ->Range = qualrange; 806 NQ->FoundDecl = founddecl; 807 } 808 809 if (targs) { 810 E->HasExplicitTemplateArgumentList = true; 811 E->getExplicitTemplateArgs().initializeFrom(*targs); 812 } 813 814 return E; 815} 816 817const char *CastExpr::getCastKindName() const { 818 switch (getCastKind()) { 819 case CK_Dependent: 820 return "Dependent"; 821 case CK_BitCast: 822 return "BitCast"; 823 case CK_LValueBitCast: 824 return "LValueBitCast"; 825 case CK_LValueToRValue: 826 return "LValueToRValue"; 827 case CK_GetObjCProperty: 828 return "GetObjCProperty"; 829 case CK_NoOp: 830 return "NoOp"; 831 case CK_BaseToDerived: 832 return "BaseToDerived"; 833 case CK_DerivedToBase: 834 return "DerivedToBase"; 835 case CK_UncheckedDerivedToBase: 836 return "UncheckedDerivedToBase"; 837 case CK_Dynamic: 838 return "Dynamic"; 839 case CK_ToUnion: 840 return "ToUnion"; 841 case CK_ArrayToPointerDecay: 842 return "ArrayToPointerDecay"; 843 case CK_FunctionToPointerDecay: 844 return "FunctionToPointerDecay"; 845 case CK_NullToMemberPointer: 846 return "NullToMemberPointer"; 847 case CK_NullToPointer: 848 return "NullToPointer"; 849 case CK_BaseToDerivedMemberPointer: 850 return "BaseToDerivedMemberPointer"; 851 case CK_DerivedToBaseMemberPointer: 852 return "DerivedToBaseMemberPointer"; 853 case CK_UserDefinedConversion: 854 return "UserDefinedConversion"; 855 case CK_ConstructorConversion: 856 return "ConstructorConversion"; 857 case CK_IntegralToPointer: 858 return "IntegralToPointer"; 859 case CK_PointerToIntegral: 860 return "PointerToIntegral"; 861 case CK_PointerToBoolean: 862 return "PointerToBoolean"; 863 case CK_ToVoid: 864 return "ToVoid"; 865 case CK_VectorSplat: 866 return "VectorSplat"; 867 case CK_IntegralCast: 868 return "IntegralCast"; 869 case CK_IntegralToBoolean: 870 return "IntegralToBoolean"; 871 case CK_IntegralToFloating: 872 return "IntegralToFloating"; 873 case CK_FloatingToIntegral: 874 return "FloatingToIntegral"; 875 case CK_FloatingCast: 876 return "FloatingCast"; 877 case CK_FloatingToBoolean: 878 return "FloatingToBoolean"; 879 case CK_MemberPointerToBoolean: 880 return "MemberPointerToBoolean"; 881 case CK_AnyPointerToObjCPointerCast: 882 return "AnyPointerToObjCPointerCast"; 883 case CK_AnyPointerToBlockPointerCast: 884 return "AnyPointerToBlockPointerCast"; 885 case CK_ObjCObjectLValueCast: 886 return "ObjCObjectLValueCast"; 887 case CK_FloatingRealToComplex: 888 return "FloatingRealToComplex"; 889 case CK_FloatingComplexToReal: 890 return "FloatingComplexToReal"; 891 case CK_FloatingComplexToBoolean: 892 return "FloatingComplexToBoolean"; 893 case CK_FloatingComplexCast: 894 return "FloatingComplexCast"; 895 case CK_FloatingComplexToIntegralComplex: 896 return "FloatingComplexToIntegralComplex"; 897 case CK_IntegralRealToComplex: 898 return "IntegralRealToComplex"; 899 case CK_IntegralComplexToReal: 900 return "IntegralComplexToReal"; 901 case CK_IntegralComplexToBoolean: 902 return "IntegralComplexToBoolean"; 903 case CK_IntegralComplexCast: 904 return "IntegralComplexCast"; 905 case CK_IntegralComplexToFloatingComplex: 906 return "IntegralComplexToFloatingComplex"; 907 } 908 909 llvm_unreachable("Unhandled cast kind!"); 910 return 0; 911} 912 913Expr *CastExpr::getSubExprAsWritten() { 914 Expr *SubExpr = 0; 915 CastExpr *E = this; 916 do { 917 SubExpr = E->getSubExpr(); 918 919 // Skip any temporary bindings; they're implicit. 920 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 921 SubExpr = Binder->getSubExpr(); 922 923 // Conversions by constructor and conversion functions have a 924 // subexpression describing the call; strip it off. 925 if (E->getCastKind() == CK_ConstructorConversion) 926 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 927 else if (E->getCastKind() == CK_UserDefinedConversion) 928 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 929 930 // If the subexpression we're left with is an implicit cast, look 931 // through that, too. 932 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 933 934 return SubExpr; 935} 936 937CXXBaseSpecifier **CastExpr::path_buffer() { 938 switch (getStmtClass()) { 939#define ABSTRACT_STMT(x) 940#define CASTEXPR(Type, Base) \ 941 case Stmt::Type##Class: \ 942 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 943#define STMT(Type, Base) 944#include "clang/AST/StmtNodes.inc" 945 default: 946 llvm_unreachable("non-cast expressions not possible here"); 947 return 0; 948 } 949} 950 951void CastExpr::setCastPath(const CXXCastPath &Path) { 952 assert(Path.size() == path_size()); 953 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 954} 955 956ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 957 CastKind Kind, Expr *Operand, 958 const CXXCastPath *BasePath, 959 ExprValueKind VK) { 960 unsigned PathSize = (BasePath ? BasePath->size() : 0); 961 void *Buffer = 962 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 963 ImplicitCastExpr *E = 964 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 965 if (PathSize) E->setCastPath(*BasePath); 966 return E; 967} 968 969ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 970 unsigned PathSize) { 971 void *Buffer = 972 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 973 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 974} 975 976 977CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 978 ExprValueKind VK, CastKind K, Expr *Op, 979 const CXXCastPath *BasePath, 980 TypeSourceInfo *WrittenTy, 981 SourceLocation L, SourceLocation R) { 982 unsigned PathSize = (BasePath ? BasePath->size() : 0); 983 void *Buffer = 984 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 985 CStyleCastExpr *E = 986 new (Buffer) CStyleCastExpr(T, VK, K, Op, PathSize, WrittenTy, L, R); 987 if (PathSize) E->setCastPath(*BasePath); 988 return E; 989} 990 991CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 992 void *Buffer = 993 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 994 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 995} 996 997/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 998/// corresponds to, e.g. "<<=". 999const char *BinaryOperator::getOpcodeStr(Opcode Op) { 1000 switch (Op) { 1001 case BO_PtrMemD: return ".*"; 1002 case BO_PtrMemI: return "->*"; 1003 case BO_Mul: return "*"; 1004 case BO_Div: return "/"; 1005 case BO_Rem: return "%"; 1006 case BO_Add: return "+"; 1007 case BO_Sub: return "-"; 1008 case BO_Shl: return "<<"; 1009 case BO_Shr: return ">>"; 1010 case BO_LT: return "<"; 1011 case BO_GT: return ">"; 1012 case BO_LE: return "<="; 1013 case BO_GE: return ">="; 1014 case BO_EQ: return "=="; 1015 case BO_NE: return "!="; 1016 case BO_And: return "&"; 1017 case BO_Xor: return "^"; 1018 case BO_Or: return "|"; 1019 case BO_LAnd: return "&&"; 1020 case BO_LOr: return "||"; 1021 case BO_Assign: return "="; 1022 case BO_MulAssign: return "*="; 1023 case BO_DivAssign: return "/="; 1024 case BO_RemAssign: return "%="; 1025 case BO_AddAssign: return "+="; 1026 case BO_SubAssign: return "-="; 1027 case BO_ShlAssign: return "<<="; 1028 case BO_ShrAssign: return ">>="; 1029 case BO_AndAssign: return "&="; 1030 case BO_XorAssign: return "^="; 1031 case BO_OrAssign: return "|="; 1032 case BO_Comma: return ","; 1033 } 1034 1035 return ""; 1036} 1037 1038BinaryOperatorKind 1039BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 1040 switch (OO) { 1041 default: assert(false && "Not an overloadable binary operator"); 1042 case OO_Plus: return BO_Add; 1043 case OO_Minus: return BO_Sub; 1044 case OO_Star: return BO_Mul; 1045 case OO_Slash: return BO_Div; 1046 case OO_Percent: return BO_Rem; 1047 case OO_Caret: return BO_Xor; 1048 case OO_Amp: return BO_And; 1049 case OO_Pipe: return BO_Or; 1050 case OO_Equal: return BO_Assign; 1051 case OO_Less: return BO_LT; 1052 case OO_Greater: return BO_GT; 1053 case OO_PlusEqual: return BO_AddAssign; 1054 case OO_MinusEqual: return BO_SubAssign; 1055 case OO_StarEqual: return BO_MulAssign; 1056 case OO_SlashEqual: return BO_DivAssign; 1057 case OO_PercentEqual: return BO_RemAssign; 1058 case OO_CaretEqual: return BO_XorAssign; 1059 case OO_AmpEqual: return BO_AndAssign; 1060 case OO_PipeEqual: return BO_OrAssign; 1061 case OO_LessLess: return BO_Shl; 1062 case OO_GreaterGreater: return BO_Shr; 1063 case OO_LessLessEqual: return BO_ShlAssign; 1064 case OO_GreaterGreaterEqual: return BO_ShrAssign; 1065 case OO_EqualEqual: return BO_EQ; 1066 case OO_ExclaimEqual: return BO_NE; 1067 case OO_LessEqual: return BO_LE; 1068 case OO_GreaterEqual: return BO_GE; 1069 case OO_AmpAmp: return BO_LAnd; 1070 case OO_PipePipe: return BO_LOr; 1071 case OO_Comma: return BO_Comma; 1072 case OO_ArrowStar: return BO_PtrMemI; 1073 } 1074} 1075 1076OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 1077 static const OverloadedOperatorKind OverOps[] = { 1078 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1079 OO_Star, OO_Slash, OO_Percent, 1080 OO_Plus, OO_Minus, 1081 OO_LessLess, OO_GreaterGreater, 1082 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1083 OO_EqualEqual, OO_ExclaimEqual, 1084 OO_Amp, 1085 OO_Caret, 1086 OO_Pipe, 1087 OO_AmpAmp, 1088 OO_PipePipe, 1089 OO_Equal, OO_StarEqual, 1090 OO_SlashEqual, OO_PercentEqual, 1091 OO_PlusEqual, OO_MinusEqual, 1092 OO_LessLessEqual, OO_GreaterGreaterEqual, 1093 OO_AmpEqual, OO_CaretEqual, 1094 OO_PipeEqual, 1095 OO_Comma 1096 }; 1097 return OverOps[Opc]; 1098} 1099 1100InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1101 Expr **initExprs, unsigned numInits, 1102 SourceLocation rbraceloc) 1103 : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false), 1104 InitExprs(C, numInits), 1105 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 1106 UnionFieldInit(0), HadArrayRangeDesignator(false) 1107{ 1108 for (unsigned I = 0; I != numInits; ++I) { 1109 if (initExprs[I]->isTypeDependent()) 1110 ExprBits.TypeDependent = true; 1111 if (initExprs[I]->isValueDependent()) 1112 ExprBits.ValueDependent = true; 1113 } 1114 1115 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1116} 1117 1118void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1119 if (NumInits > InitExprs.size()) 1120 InitExprs.reserve(C, NumInits); 1121} 1122 1123void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1124 InitExprs.resize(C, NumInits, 0); 1125} 1126 1127Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1128 if (Init >= InitExprs.size()) { 1129 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1130 InitExprs.back() = expr; 1131 return 0; 1132 } 1133 1134 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1135 InitExprs[Init] = expr; 1136 return Result; 1137} 1138 1139SourceRange InitListExpr::getSourceRange() const { 1140 if (SyntacticForm) 1141 return SyntacticForm->getSourceRange(); 1142 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1143 if (Beg.isInvalid()) { 1144 // Find the first non-null initializer. 1145 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1146 E = InitExprs.end(); 1147 I != E; ++I) { 1148 if (Stmt *S = *I) { 1149 Beg = S->getLocStart(); 1150 break; 1151 } 1152 } 1153 } 1154 if (End.isInvalid()) { 1155 // Find the first non-null initializer from the end. 1156 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1157 E = InitExprs.rend(); 1158 I != E; ++I) { 1159 if (Stmt *S = *I) { 1160 End = S->getSourceRange().getEnd(); 1161 break; 1162 } 1163 } 1164 } 1165 return SourceRange(Beg, End); 1166} 1167 1168/// getFunctionType - Return the underlying function type for this block. 1169/// 1170const FunctionType *BlockExpr::getFunctionType() const { 1171 return getType()->getAs<BlockPointerType>()-> 1172 getPointeeType()->getAs<FunctionType>(); 1173} 1174 1175SourceLocation BlockExpr::getCaretLocation() const { 1176 return TheBlock->getCaretLocation(); 1177} 1178const Stmt *BlockExpr::getBody() const { 1179 return TheBlock->getBody(); 1180} 1181Stmt *BlockExpr::getBody() { 1182 return TheBlock->getBody(); 1183} 1184 1185 1186//===----------------------------------------------------------------------===// 1187// Generic Expression Routines 1188//===----------------------------------------------------------------------===// 1189 1190/// isUnusedResultAWarning - Return true if this immediate expression should 1191/// be warned about if the result is unused. If so, fill in Loc and Ranges 1192/// with location to warn on and the source range[s] to report with the 1193/// warning. 1194bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1195 SourceRange &R2, ASTContext &Ctx) const { 1196 // Don't warn if the expr is type dependent. The type could end up 1197 // instantiating to void. 1198 if (isTypeDependent()) 1199 return false; 1200 1201 switch (getStmtClass()) { 1202 default: 1203 if (getType()->isVoidType()) 1204 return false; 1205 Loc = getExprLoc(); 1206 R1 = getSourceRange(); 1207 return true; 1208 case ParenExprClass: 1209 return cast<ParenExpr>(this)->getSubExpr()-> 1210 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1211 case UnaryOperatorClass: { 1212 const UnaryOperator *UO = cast<UnaryOperator>(this); 1213 1214 switch (UO->getOpcode()) { 1215 default: break; 1216 case UO_PostInc: 1217 case UO_PostDec: 1218 case UO_PreInc: 1219 case UO_PreDec: // ++/-- 1220 return false; // Not a warning. 1221 case UO_Deref: 1222 // Dereferencing a volatile pointer is a side-effect. 1223 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1224 return false; 1225 break; 1226 case UO_Real: 1227 case UO_Imag: 1228 // accessing a piece of a volatile complex is a side-effect. 1229 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1230 .isVolatileQualified()) 1231 return false; 1232 break; 1233 case UO_Extension: 1234 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1235 } 1236 Loc = UO->getOperatorLoc(); 1237 R1 = UO->getSubExpr()->getSourceRange(); 1238 return true; 1239 } 1240 case BinaryOperatorClass: { 1241 const BinaryOperator *BO = cast<BinaryOperator>(this); 1242 switch (BO->getOpcode()) { 1243 default: 1244 break; 1245 // Consider the RHS of comma for side effects. LHS was checked by 1246 // Sema::CheckCommaOperands. 1247 case BO_Comma: 1248 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1249 // lvalue-ness) of an assignment written in a macro. 1250 if (IntegerLiteral *IE = 1251 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1252 if (IE->getValue() == 0) 1253 return false; 1254 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1255 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1256 case BO_LAnd: 1257 case BO_LOr: 1258 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1259 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1260 return false; 1261 break; 1262 } 1263 if (BO->isAssignmentOp()) 1264 return false; 1265 Loc = BO->getOperatorLoc(); 1266 R1 = BO->getLHS()->getSourceRange(); 1267 R2 = BO->getRHS()->getSourceRange(); 1268 return true; 1269 } 1270 case CompoundAssignOperatorClass: 1271 case VAArgExprClass: 1272 return false; 1273 1274 case ConditionalOperatorClass: { 1275 // The condition must be evaluated, but if either the LHS or RHS is a 1276 // warning, warn about them. 1277 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1278 if (Exp->getLHS() && 1279 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1280 return true; 1281 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1282 } 1283 1284 case MemberExprClass: 1285 // If the base pointer or element is to a volatile pointer/field, accessing 1286 // it is a side effect. 1287 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1288 return false; 1289 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1290 R1 = SourceRange(Loc, Loc); 1291 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1292 return true; 1293 1294 case ArraySubscriptExprClass: 1295 // If the base pointer or element is to a volatile pointer/field, accessing 1296 // it is a side effect. 1297 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1298 return false; 1299 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1300 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1301 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1302 return true; 1303 1304 case CallExprClass: 1305 case CXXOperatorCallExprClass: 1306 case CXXMemberCallExprClass: { 1307 // If this is a direct call, get the callee. 1308 const CallExpr *CE = cast<CallExpr>(this); 1309 if (const Decl *FD = CE->getCalleeDecl()) { 1310 // If the callee has attribute pure, const, or warn_unused_result, warn 1311 // about it. void foo() { strlen("bar"); } should warn. 1312 // 1313 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1314 // updated to match for QoI. 1315 if (FD->getAttr<WarnUnusedResultAttr>() || 1316 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1317 Loc = CE->getCallee()->getLocStart(); 1318 R1 = CE->getCallee()->getSourceRange(); 1319 1320 if (unsigned NumArgs = CE->getNumArgs()) 1321 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1322 CE->getArg(NumArgs-1)->getLocEnd()); 1323 return true; 1324 } 1325 } 1326 return false; 1327 } 1328 1329 case CXXTemporaryObjectExprClass: 1330 case CXXConstructExprClass: 1331 return false; 1332 1333 case ObjCMessageExprClass: { 1334 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1335 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1336 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1337 Loc = getExprLoc(); 1338 return true; 1339 } 1340 return false; 1341 } 1342 1343 case ObjCPropertyRefExprClass: 1344 Loc = getExprLoc(); 1345 R1 = getSourceRange(); 1346 return true; 1347 1348 case StmtExprClass: { 1349 // Statement exprs don't logically have side effects themselves, but are 1350 // sometimes used in macros in ways that give them a type that is unused. 1351 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1352 // however, if the result of the stmt expr is dead, we don't want to emit a 1353 // warning. 1354 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1355 if (!CS->body_empty()) { 1356 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1357 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1358 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1359 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1360 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1361 } 1362 1363 if (getType()->isVoidType()) 1364 return false; 1365 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1366 R1 = getSourceRange(); 1367 return true; 1368 } 1369 case CStyleCastExprClass: 1370 // If this is an explicit cast to void, allow it. People do this when they 1371 // think they know what they're doing :). 1372 if (getType()->isVoidType()) 1373 return false; 1374 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1375 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1376 return true; 1377 case CXXFunctionalCastExprClass: { 1378 if (getType()->isVoidType()) 1379 return false; 1380 const CastExpr *CE = cast<CastExpr>(this); 1381 1382 // If this is a cast to void or a constructor conversion, check the operand. 1383 // Otherwise, the result of the cast is unused. 1384 if (CE->getCastKind() == CK_ToVoid || 1385 CE->getCastKind() == CK_ConstructorConversion) 1386 return (cast<CastExpr>(this)->getSubExpr() 1387 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1388 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1389 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1390 return true; 1391 } 1392 1393 case ImplicitCastExprClass: 1394 // Check the operand, since implicit casts are inserted by Sema 1395 return (cast<ImplicitCastExpr>(this) 1396 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1397 1398 case CXXDefaultArgExprClass: 1399 return (cast<CXXDefaultArgExpr>(this) 1400 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1401 1402 case CXXNewExprClass: 1403 // FIXME: In theory, there might be new expressions that don't have side 1404 // effects (e.g. a placement new with an uninitialized POD). 1405 case CXXDeleteExprClass: 1406 return false; 1407 case CXXBindTemporaryExprClass: 1408 return (cast<CXXBindTemporaryExpr>(this) 1409 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1410 case CXXExprWithTemporariesClass: 1411 return (cast<CXXExprWithTemporaries>(this) 1412 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1413 } 1414} 1415 1416/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1417/// returns true, if it is; false otherwise. 1418bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1419 switch (getStmtClass()) { 1420 default: 1421 return false; 1422 case ObjCIvarRefExprClass: 1423 return true; 1424 case Expr::UnaryOperatorClass: 1425 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1426 case ParenExprClass: 1427 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1428 case ImplicitCastExprClass: 1429 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1430 case CStyleCastExprClass: 1431 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1432 case DeclRefExprClass: { 1433 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1434 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1435 if (VD->hasGlobalStorage()) 1436 return true; 1437 QualType T = VD->getType(); 1438 // dereferencing to a pointer is always a gc'able candidate, 1439 // unless it is __weak. 1440 return T->isPointerType() && 1441 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1442 } 1443 return false; 1444 } 1445 case MemberExprClass: { 1446 const MemberExpr *M = cast<MemberExpr>(this); 1447 return M->getBase()->isOBJCGCCandidate(Ctx); 1448 } 1449 case ArraySubscriptExprClass: 1450 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1451 } 1452} 1453 1454bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1455 if (isTypeDependent()) 1456 return false; 1457 return ClassifyLValue(Ctx) == Expr::LV_MemberFunction; 1458} 1459 1460static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1461 Expr::CanThrowResult CT2) { 1462 // CanThrowResult constants are ordered so that the maximum is the correct 1463 // merge result. 1464 return CT1 > CT2 ? CT1 : CT2; 1465} 1466 1467static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1468 Expr *E = const_cast<Expr*>(CE); 1469 Expr::CanThrowResult R = Expr::CT_Cannot; 1470 for (Expr::child_iterator I = E->child_begin(), IE = E->child_end(); 1471 I != IE && R != Expr::CT_Can; ++I) { 1472 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1473 } 1474 return R; 1475} 1476 1477static Expr::CanThrowResult CanCalleeThrow(const Decl *D, 1478 bool NullThrows = true) { 1479 if (!D) 1480 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1481 1482 // See if we can get a function type from the decl somehow. 1483 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1484 if (!VD) // If we have no clue what we're calling, assume the worst. 1485 return Expr::CT_Can; 1486 1487 // As an extension, we assume that __attribute__((nothrow)) functions don't 1488 // throw. 1489 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1490 return Expr::CT_Cannot; 1491 1492 QualType T = VD->getType(); 1493 const FunctionProtoType *FT; 1494 if ((FT = T->getAs<FunctionProtoType>())) { 1495 } else if (const PointerType *PT = T->getAs<PointerType>()) 1496 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1497 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1498 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1499 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1500 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1501 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1502 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1503 1504 if (!FT) 1505 return Expr::CT_Can; 1506 1507 return FT->hasEmptyExceptionSpec() ? Expr::CT_Cannot : Expr::CT_Can; 1508} 1509 1510static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1511 if (DC->isTypeDependent()) 1512 return Expr::CT_Dependent; 1513 1514 if (!DC->getTypeAsWritten()->isReferenceType()) 1515 return Expr::CT_Cannot; 1516 1517 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1518} 1519 1520static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1521 const CXXTypeidExpr *DC) { 1522 if (DC->isTypeOperand()) 1523 return Expr::CT_Cannot; 1524 1525 Expr *Op = DC->getExprOperand(); 1526 if (Op->isTypeDependent()) 1527 return Expr::CT_Dependent; 1528 1529 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1530 if (!RT) 1531 return Expr::CT_Cannot; 1532 1533 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1534 return Expr::CT_Cannot; 1535 1536 if (Op->Classify(C).isPRValue()) 1537 return Expr::CT_Cannot; 1538 1539 return Expr::CT_Can; 1540} 1541 1542Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 1543 // C++ [expr.unary.noexcept]p3: 1544 // [Can throw] if in a potentially-evaluated context the expression would 1545 // contain: 1546 switch (getStmtClass()) { 1547 case CXXThrowExprClass: 1548 // - a potentially evaluated throw-expression 1549 return CT_Can; 1550 1551 case CXXDynamicCastExprClass: { 1552 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 1553 // where T is a reference type, that requires a run-time check 1554 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 1555 if (CT == CT_Can) 1556 return CT; 1557 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1558 } 1559 1560 case CXXTypeidExprClass: 1561 // - a potentially evaluated typeid expression applied to a glvalue 1562 // expression whose type is a polymorphic class type 1563 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 1564 1565 // - a potentially evaluated call to a function, member function, function 1566 // pointer, or member function pointer that does not have a non-throwing 1567 // exception-specification 1568 case CallExprClass: 1569 case CXXOperatorCallExprClass: 1570 case CXXMemberCallExprClass: { 1571 CanThrowResult CT = CanCalleeThrow(cast<CallExpr>(this)->getCalleeDecl()); 1572 if (CT == CT_Can) 1573 return CT; 1574 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1575 } 1576 1577 case CXXConstructExprClass: 1578 case CXXTemporaryObjectExprClass: { 1579 CanThrowResult CT = CanCalleeThrow( 1580 cast<CXXConstructExpr>(this)->getConstructor()); 1581 if (CT == CT_Can) 1582 return CT; 1583 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1584 } 1585 1586 case CXXNewExprClass: { 1587 CanThrowResult CT = MergeCanThrow( 1588 CanCalleeThrow(cast<CXXNewExpr>(this)->getOperatorNew()), 1589 CanCalleeThrow(cast<CXXNewExpr>(this)->getConstructor(), 1590 /*NullThrows*/false)); 1591 if (CT == CT_Can) 1592 return CT; 1593 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1594 } 1595 1596 case CXXDeleteExprClass: { 1597 CanThrowResult CT = CanCalleeThrow( 1598 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 1599 if (CT == CT_Can) 1600 return CT; 1601 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument(); 1602 // Unwrap exactly one implicit cast, which converts all pointers to void*. 1603 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) 1604 Arg = Cast->getSubExpr(); 1605 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) { 1606 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) { 1607 CanThrowResult CT2 = CanCalleeThrow( 1608 cast<CXXRecordDecl>(RT->getDecl())->getDestructor()); 1609 if (CT2 == CT_Can) 1610 return CT2; 1611 CT = MergeCanThrow(CT, CT2); 1612 } 1613 } 1614 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1615 } 1616 1617 case CXXBindTemporaryExprClass: { 1618 // The bound temporary has to be destroyed again, which might throw. 1619 CanThrowResult CT = CanCalleeThrow( 1620 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 1621 if (CT == CT_Can) 1622 return CT; 1623 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1624 } 1625 1626 // ObjC message sends are like function calls, but never have exception 1627 // specs. 1628 case ObjCMessageExprClass: 1629 case ObjCPropertyRefExprClass: 1630 return CT_Can; 1631 1632 // Many other things have subexpressions, so we have to test those. 1633 // Some are simple: 1634 case ParenExprClass: 1635 case MemberExprClass: 1636 case CXXReinterpretCastExprClass: 1637 case CXXConstCastExprClass: 1638 case ConditionalOperatorClass: 1639 case CompoundLiteralExprClass: 1640 case ExtVectorElementExprClass: 1641 case InitListExprClass: 1642 case DesignatedInitExprClass: 1643 case ParenListExprClass: 1644 case VAArgExprClass: 1645 case CXXDefaultArgExprClass: 1646 case CXXExprWithTemporariesClass: 1647 case ObjCIvarRefExprClass: 1648 case ObjCIsaExprClass: 1649 case ShuffleVectorExprClass: 1650 return CanSubExprsThrow(C, this); 1651 1652 // Some might be dependent for other reasons. 1653 case UnaryOperatorClass: 1654 case ArraySubscriptExprClass: 1655 case ImplicitCastExprClass: 1656 case CStyleCastExprClass: 1657 case CXXStaticCastExprClass: 1658 case CXXFunctionalCastExprClass: 1659 case BinaryOperatorClass: 1660 case CompoundAssignOperatorClass: { 1661 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 1662 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1663 } 1664 1665 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 1666 case StmtExprClass: 1667 return CT_Can; 1668 1669 case ChooseExprClass: 1670 if (isTypeDependent() || isValueDependent()) 1671 return CT_Dependent; 1672 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 1673 1674 // Some expressions are always dependent. 1675 case DependentScopeDeclRefExprClass: 1676 case CXXUnresolvedConstructExprClass: 1677 case CXXDependentScopeMemberExprClass: 1678 return CT_Dependent; 1679 1680 default: 1681 // All other expressions don't have subexpressions, or else they are 1682 // unevaluated. 1683 return CT_Cannot; 1684 } 1685} 1686 1687Expr* Expr::IgnoreParens() { 1688 Expr* E = this; 1689 while (true) { 1690 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1691 E = P->getSubExpr(); 1692 continue; 1693 } 1694 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1695 if (P->getOpcode() == UO_Extension) { 1696 E = P->getSubExpr(); 1697 continue; 1698 } 1699 } 1700 return E; 1701 } 1702} 1703 1704/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1705/// or CastExprs or ImplicitCastExprs, returning their operand. 1706Expr *Expr::IgnoreParenCasts() { 1707 Expr *E = this; 1708 while (true) { 1709 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1710 E = P->getSubExpr(); 1711 continue; 1712 } 1713 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1714 E = P->getSubExpr(); 1715 continue; 1716 } 1717 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1718 if (P->getOpcode() == UO_Extension) { 1719 E = P->getSubExpr(); 1720 continue; 1721 } 1722 } 1723 return E; 1724 } 1725} 1726 1727/// IgnoreParenLValueCasts - Ignore parentheses and lvalue-to-rvalue 1728/// casts. This is intended purely as a temporary workaround for code 1729/// that hasn't yet been rewritten to do the right thing about those 1730/// casts, and may disappear along with the last internal use. 1731Expr *Expr::IgnoreParenLValueCasts() { 1732 Expr *E = this; 1733 while (true) { 1734 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1735 E = P->getSubExpr(); 1736 continue; 1737 } else if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1738 if (P->getCastKind() == CK_LValueToRValue) { 1739 E = P->getSubExpr(); 1740 continue; 1741 } 1742 } else if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1743 if (P->getOpcode() == UO_Extension) { 1744 E = P->getSubExpr(); 1745 continue; 1746 } 1747 } 1748 break; 1749 } 1750 return E; 1751} 1752 1753Expr *Expr::IgnoreParenImpCasts() { 1754 Expr *E = this; 1755 while (true) { 1756 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1757 E = P->getSubExpr(); 1758 continue; 1759 } 1760 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 1761 E = P->getSubExpr(); 1762 continue; 1763 } 1764 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1765 if (P->getOpcode() == UO_Extension) { 1766 E = P->getSubExpr(); 1767 continue; 1768 } 1769 } 1770 return E; 1771 } 1772} 1773 1774/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1775/// value (including ptr->int casts of the same size). Strip off any 1776/// ParenExpr or CastExprs, returning their operand. 1777Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1778 Expr *E = this; 1779 while (true) { 1780 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1781 E = P->getSubExpr(); 1782 continue; 1783 } 1784 1785 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1786 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1787 // ptr<->int casts of the same width. We also ignore all identity casts. 1788 Expr *SE = P->getSubExpr(); 1789 1790 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1791 E = SE; 1792 continue; 1793 } 1794 1795 if ((E->getType()->isPointerType() || 1796 E->getType()->isIntegralType(Ctx)) && 1797 (SE->getType()->isPointerType() || 1798 SE->getType()->isIntegralType(Ctx)) && 1799 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1800 E = SE; 1801 continue; 1802 } 1803 } 1804 1805 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1806 if (P->getOpcode() == UO_Extension) { 1807 E = P->getSubExpr(); 1808 continue; 1809 } 1810 } 1811 1812 return E; 1813 } 1814} 1815 1816bool Expr::isDefaultArgument() const { 1817 const Expr *E = this; 1818 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1819 E = ICE->getSubExprAsWritten(); 1820 1821 return isa<CXXDefaultArgExpr>(E); 1822} 1823 1824/// \brief Skip over any no-op casts and any temporary-binding 1825/// expressions. 1826static const Expr *skipTemporaryBindingsNoOpCastsAndParens(const Expr *E) { 1827 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1828 if (ICE->getCastKind() == CK_NoOp) 1829 E = ICE->getSubExpr(); 1830 else 1831 break; 1832 } 1833 1834 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1835 E = BE->getSubExpr(); 1836 1837 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1838 if (ICE->getCastKind() == CK_NoOp) 1839 E = ICE->getSubExpr(); 1840 else 1841 break; 1842 } 1843 1844 return E->IgnoreParens(); 1845} 1846 1847/// isTemporaryObject - Determines if this expression produces a 1848/// temporary of the given class type. 1849bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 1850 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 1851 return false; 1852 1853 const Expr *E = skipTemporaryBindingsNoOpCastsAndParens(this); 1854 1855 // Temporaries are by definition pr-values of class type. 1856 if (!E->Classify(C).isPRValue()) { 1857 // In this context, property reference is a message call and is pr-value. 1858 if (!isa<ObjCPropertyRefExpr>(E)) 1859 return false; 1860 } 1861 1862 // Black-list a few cases which yield pr-values of class type that don't 1863 // refer to temporaries of that type: 1864 1865 // - implicit derived-to-base conversions 1866 if (isa<ImplicitCastExpr>(E)) { 1867 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 1868 case CK_DerivedToBase: 1869 case CK_UncheckedDerivedToBase: 1870 return false; 1871 default: 1872 break; 1873 } 1874 } 1875 1876 // - member expressions (all) 1877 if (isa<MemberExpr>(E)) 1878 return false; 1879 1880 return true; 1881} 1882 1883/// hasAnyTypeDependentArguments - Determines if any of the expressions 1884/// in Exprs is type-dependent. 1885bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1886 for (unsigned I = 0; I < NumExprs; ++I) 1887 if (Exprs[I]->isTypeDependent()) 1888 return true; 1889 1890 return false; 1891} 1892 1893/// hasAnyValueDependentArguments - Determines if any of the expressions 1894/// in Exprs is value-dependent. 1895bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1896 for (unsigned I = 0; I < NumExprs; ++I) 1897 if (Exprs[I]->isValueDependent()) 1898 return true; 1899 1900 return false; 1901} 1902 1903bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 1904 // This function is attempting whether an expression is an initializer 1905 // which can be evaluated at compile-time. isEvaluatable handles most 1906 // of the cases, but it can't deal with some initializer-specific 1907 // expressions, and it can't deal with aggregates; we deal with those here, 1908 // and fall back to isEvaluatable for the other cases. 1909 1910 // If we ever capture reference-binding directly in the AST, we can 1911 // kill the second parameter. 1912 1913 if (IsForRef) { 1914 EvalResult Result; 1915 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 1916 } 1917 1918 switch (getStmtClass()) { 1919 default: break; 1920 case StringLiteralClass: 1921 case ObjCStringLiteralClass: 1922 case ObjCEncodeExprClass: 1923 return true; 1924 case CXXTemporaryObjectExprClass: 1925 case CXXConstructExprClass: { 1926 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 1927 1928 // Only if it's 1929 // 1) an application of the trivial default constructor or 1930 if (!CE->getConstructor()->isTrivial()) return false; 1931 if (!CE->getNumArgs()) return true; 1932 1933 // 2) an elidable trivial copy construction of an operand which is 1934 // itself a constant initializer. Note that we consider the 1935 // operand on its own, *not* as a reference binding. 1936 return CE->isElidable() && 1937 CE->getArg(0)->isConstantInitializer(Ctx, false); 1938 } 1939 case CompoundLiteralExprClass: { 1940 // This handles gcc's extension that allows global initializers like 1941 // "struct x {int x;} x = (struct x) {};". 1942 // FIXME: This accepts other cases it shouldn't! 1943 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1944 return Exp->isConstantInitializer(Ctx, false); 1945 } 1946 case InitListExprClass: { 1947 // FIXME: This doesn't deal with fields with reference types correctly. 1948 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1949 // to bitfields. 1950 const InitListExpr *Exp = cast<InitListExpr>(this); 1951 unsigned numInits = Exp->getNumInits(); 1952 for (unsigned i = 0; i < numInits; i++) { 1953 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 1954 return false; 1955 } 1956 return true; 1957 } 1958 case ImplicitValueInitExprClass: 1959 return true; 1960 case ParenExprClass: 1961 return cast<ParenExpr>(this)->getSubExpr() 1962 ->isConstantInitializer(Ctx, IsForRef); 1963 case ChooseExprClass: 1964 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 1965 ->isConstantInitializer(Ctx, IsForRef); 1966 case UnaryOperatorClass: { 1967 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1968 if (Exp->getOpcode() == UO_Extension) 1969 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 1970 break; 1971 } 1972 case BinaryOperatorClass: { 1973 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1974 // but this handles the common case. 1975 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1976 if (Exp->getOpcode() == BO_Sub && 1977 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1978 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1979 return true; 1980 break; 1981 } 1982 case CXXFunctionalCastExprClass: 1983 case CXXStaticCastExprClass: 1984 case ImplicitCastExprClass: 1985 case CStyleCastExprClass: 1986 // Handle casts with a destination that's a struct or union; this 1987 // deals with both the gcc no-op struct cast extension and the 1988 // cast-to-union extension. 1989 if (getType()->isRecordType()) 1990 return cast<CastExpr>(this)->getSubExpr() 1991 ->isConstantInitializer(Ctx, false); 1992 1993 // Integer->integer casts can be handled here, which is important for 1994 // things like (int)(&&x-&&y). Scary but true. 1995 if (getType()->isIntegerType() && 1996 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1997 return cast<CastExpr>(this)->getSubExpr() 1998 ->isConstantInitializer(Ctx, false); 1999 2000 break; 2001 } 2002 return isEvaluatable(Ctx); 2003} 2004 2005/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 2006/// integer constant expression with the value zero, or if this is one that is 2007/// cast to void*. 2008bool Expr::isNullPointerConstant(ASTContext &Ctx, 2009 NullPointerConstantValueDependence NPC) const { 2010 if (isValueDependent()) { 2011 switch (NPC) { 2012 case NPC_NeverValueDependent: 2013 assert(false && "Unexpected value dependent expression!"); 2014 // If the unthinkable happens, fall through to the safest alternative. 2015 2016 case NPC_ValueDependentIsNull: 2017 return isTypeDependent() || getType()->isIntegralType(Ctx); 2018 2019 case NPC_ValueDependentIsNotNull: 2020 return false; 2021 } 2022 } 2023 2024 // Strip off a cast to void*, if it exists. Except in C++. 2025 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 2026 if (!Ctx.getLangOptions().CPlusPlus) { 2027 // Check that it is a cast to void*. 2028 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 2029 QualType Pointee = PT->getPointeeType(); 2030 if (!Pointee.hasQualifiers() && 2031 Pointee->isVoidType() && // to void* 2032 CE->getSubExpr()->getType()->isIntegerType()) // from int. 2033 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2034 } 2035 } 2036 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 2037 // Ignore the ImplicitCastExpr type entirely. 2038 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2039 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 2040 // Accept ((void*)0) as a null pointer constant, as many other 2041 // implementations do. 2042 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 2043 } else if (const CXXDefaultArgExpr *DefaultArg 2044 = dyn_cast<CXXDefaultArgExpr>(this)) { 2045 // See through default argument expressions 2046 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 2047 } else if (isa<GNUNullExpr>(this)) { 2048 // The GNU __null extension is always a null pointer constant. 2049 return true; 2050 } 2051 2052 // C++0x nullptr_t is always a null pointer constant. 2053 if (getType()->isNullPtrType()) 2054 return true; 2055 2056 if (const RecordType *UT = getType()->getAsUnionType()) 2057 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 2058 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 2059 const Expr *InitExpr = CLE->getInitializer(); 2060 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 2061 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 2062 } 2063 // This expression must be an integer type. 2064 if (!getType()->isIntegerType() || 2065 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 2066 return false; 2067 2068 // If we have an integer constant expression, we need to *evaluate* it and 2069 // test for the value 0. 2070 llvm::APSInt Result; 2071 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 2072} 2073 2074/// \brief If this expression is an l-value for an Objective C 2075/// property, find the underlying property reference expression. 2076const ObjCPropertyRefExpr *Expr::getObjCProperty() const { 2077 const Expr *E = this; 2078 while (true) { 2079 assert((E->getValueKind() == VK_LValue && 2080 E->getObjectKind() == OK_ObjCProperty) && 2081 "expression is not a property reference"); 2082 E = E->IgnoreParenCasts(); 2083 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2084 if (BO->getOpcode() == BO_Comma) { 2085 E = BO->getRHS(); 2086 continue; 2087 } 2088 } 2089 2090 break; 2091 } 2092 2093 return cast<ObjCPropertyRefExpr>(E); 2094} 2095 2096FieldDecl *Expr::getBitField() { 2097 Expr *E = this->IgnoreParens(); 2098 2099 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2100 if (ICE->getCastKind() == CK_LValueToRValue || 2101 (ICE->getValueKind() != VK_RValue && ICE->getCastKind() == CK_NoOp)) 2102 E = ICE->getSubExpr()->IgnoreParens(); 2103 else 2104 break; 2105 } 2106 2107 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 2108 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 2109 if (Field->isBitField()) 2110 return Field; 2111 2112 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 2113 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2114 if (Field->isBitField()) 2115 return Field; 2116 2117 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2118 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2119 return BinOp->getLHS()->getBitField(); 2120 2121 return 0; 2122} 2123 2124bool Expr::refersToVectorElement() const { 2125 const Expr *E = this->IgnoreParens(); 2126 2127 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2128 if (ICE->getValueKind() != VK_RValue && 2129 ICE->getCastKind() == CK_NoOp) 2130 E = ICE->getSubExpr()->IgnoreParens(); 2131 else 2132 break; 2133 } 2134 2135 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2136 return ASE->getBase()->getType()->isVectorType(); 2137 2138 if (isa<ExtVectorElementExpr>(E)) 2139 return true; 2140 2141 return false; 2142} 2143 2144/// isArrow - Return true if the base expression is a pointer to vector, 2145/// return false if the base expression is a vector. 2146bool ExtVectorElementExpr::isArrow() const { 2147 return getBase()->getType()->isPointerType(); 2148} 2149 2150unsigned ExtVectorElementExpr::getNumElements() const { 2151 if (const VectorType *VT = getType()->getAs<VectorType>()) 2152 return VT->getNumElements(); 2153 return 1; 2154} 2155 2156/// containsDuplicateElements - Return true if any element access is repeated. 2157bool ExtVectorElementExpr::containsDuplicateElements() const { 2158 // FIXME: Refactor this code to an accessor on the AST node which returns the 2159 // "type" of component access, and share with code below and in Sema. 2160 llvm::StringRef Comp = Accessor->getName(); 2161 2162 // Halving swizzles do not contain duplicate elements. 2163 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2164 return false; 2165 2166 // Advance past s-char prefix on hex swizzles. 2167 if (Comp[0] == 's' || Comp[0] == 'S') 2168 Comp = Comp.substr(1); 2169 2170 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2171 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2172 return true; 2173 2174 return false; 2175} 2176 2177/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2178void ExtVectorElementExpr::getEncodedElementAccess( 2179 llvm::SmallVectorImpl<unsigned> &Elts) const { 2180 llvm::StringRef Comp = Accessor->getName(); 2181 if (Comp[0] == 's' || Comp[0] == 'S') 2182 Comp = Comp.substr(1); 2183 2184 bool isHi = Comp == "hi"; 2185 bool isLo = Comp == "lo"; 2186 bool isEven = Comp == "even"; 2187 bool isOdd = Comp == "odd"; 2188 2189 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2190 uint64_t Index; 2191 2192 if (isHi) 2193 Index = e + i; 2194 else if (isLo) 2195 Index = i; 2196 else if (isEven) 2197 Index = 2 * i; 2198 else if (isOdd) 2199 Index = 2 * i + 1; 2200 else 2201 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2202 2203 Elts.push_back(Index); 2204 } 2205} 2206 2207ObjCMessageExpr::ObjCMessageExpr(QualType T, 2208 ExprValueKind VK, 2209 SourceLocation LBracLoc, 2210 SourceLocation SuperLoc, 2211 bool IsInstanceSuper, 2212 QualType SuperType, 2213 Selector Sel, 2214 ObjCMethodDecl *Method, 2215 Expr **Args, unsigned NumArgs, 2216 SourceLocation RBracLoc) 2217 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, 2218 /*TypeDependent=*/false, /*ValueDependent=*/false), 2219 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 2220 HasMethod(Method != 0), SuperLoc(SuperLoc), 2221 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2222 : Sel.getAsOpaquePtr())), 2223 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2224{ 2225 setReceiverPointer(SuperType.getAsOpaquePtr()); 2226 if (NumArgs) 2227 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2228} 2229 2230ObjCMessageExpr::ObjCMessageExpr(QualType T, 2231 ExprValueKind VK, 2232 SourceLocation LBracLoc, 2233 TypeSourceInfo *Receiver, 2234 Selector Sel, 2235 ObjCMethodDecl *Method, 2236 Expr **Args, unsigned NumArgs, 2237 SourceLocation RBracLoc) 2238 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, T->isDependentType(), 2239 (T->isDependentType() || 2240 hasAnyValueDependentArguments(Args, NumArgs))), 2241 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 2242 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2243 : Sel.getAsOpaquePtr())), 2244 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2245{ 2246 setReceiverPointer(Receiver); 2247 if (NumArgs) 2248 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2249} 2250 2251ObjCMessageExpr::ObjCMessageExpr(QualType T, 2252 ExprValueKind VK, 2253 SourceLocation LBracLoc, 2254 Expr *Receiver, 2255 Selector Sel, 2256 ObjCMethodDecl *Method, 2257 Expr **Args, unsigned NumArgs, 2258 SourceLocation RBracLoc) 2259 : Expr(ObjCMessageExprClass, T, VK, OK_Ordinary, Receiver->isTypeDependent(), 2260 (Receiver->isTypeDependent() || 2261 hasAnyValueDependentArguments(Args, NumArgs))), 2262 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2263 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2264 : Sel.getAsOpaquePtr())), 2265 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2266{ 2267 setReceiverPointer(Receiver); 2268 if (NumArgs) 2269 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2270} 2271 2272ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2273 ExprValueKind VK, 2274 SourceLocation LBracLoc, 2275 SourceLocation SuperLoc, 2276 bool IsInstanceSuper, 2277 QualType SuperType, 2278 Selector Sel, 2279 ObjCMethodDecl *Method, 2280 Expr **Args, unsigned NumArgs, 2281 SourceLocation RBracLoc) { 2282 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2283 NumArgs * sizeof(Expr *); 2284 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2285 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, SuperLoc, IsInstanceSuper, 2286 SuperType, Sel, Method, Args, NumArgs, 2287 RBracLoc); 2288} 2289 2290ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2291 ExprValueKind VK, 2292 SourceLocation LBracLoc, 2293 TypeSourceInfo *Receiver, 2294 Selector Sel, 2295 ObjCMethodDecl *Method, 2296 Expr **Args, unsigned NumArgs, 2297 SourceLocation RBracLoc) { 2298 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2299 NumArgs * sizeof(Expr *); 2300 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2301 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, Method, Args, 2302 NumArgs, RBracLoc); 2303} 2304 2305ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2306 ExprValueKind VK, 2307 SourceLocation LBracLoc, 2308 Expr *Receiver, 2309 Selector Sel, 2310 ObjCMethodDecl *Method, 2311 Expr **Args, unsigned NumArgs, 2312 SourceLocation RBracLoc) { 2313 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2314 NumArgs * sizeof(Expr *); 2315 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2316 return new (Mem) ObjCMessageExpr(T, VK, LBracLoc, Receiver, Sel, Method, Args, 2317 NumArgs, RBracLoc); 2318} 2319 2320ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2321 unsigned NumArgs) { 2322 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2323 NumArgs * sizeof(Expr *); 2324 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2325 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2326} 2327 2328Selector ObjCMessageExpr::getSelector() const { 2329 if (HasMethod) 2330 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2331 ->getSelector(); 2332 return Selector(SelectorOrMethod); 2333} 2334 2335ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2336 switch (getReceiverKind()) { 2337 case Instance: 2338 if (const ObjCObjectPointerType *Ptr 2339 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2340 return Ptr->getInterfaceDecl(); 2341 break; 2342 2343 case Class: 2344 if (const ObjCObjectType *Ty 2345 = getClassReceiver()->getAs<ObjCObjectType>()) 2346 return Ty->getInterface(); 2347 break; 2348 2349 case SuperInstance: 2350 if (const ObjCObjectPointerType *Ptr 2351 = getSuperType()->getAs<ObjCObjectPointerType>()) 2352 return Ptr->getInterfaceDecl(); 2353 break; 2354 2355 case SuperClass: 2356 if (const ObjCObjectPointerType *Iface 2357 = getSuperType()->getAs<ObjCObjectPointerType>()) 2358 return Iface->getInterfaceDecl(); 2359 break; 2360 } 2361 2362 return 0; 2363} 2364 2365bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2366 return getCond()->EvaluateAsInt(C) != 0; 2367} 2368 2369void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2370 unsigned NumExprs) { 2371 if (SubExprs) C.Deallocate(SubExprs); 2372 2373 SubExprs = new (C) Stmt* [NumExprs]; 2374 this->NumExprs = NumExprs; 2375 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2376} 2377 2378//===----------------------------------------------------------------------===// 2379// DesignatedInitExpr 2380//===----------------------------------------------------------------------===// 2381 2382IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2383 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2384 if (Field.NameOrField & 0x01) 2385 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2386 else 2387 return getField()->getIdentifier(); 2388} 2389 2390DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2391 unsigned NumDesignators, 2392 const Designator *Designators, 2393 SourceLocation EqualOrColonLoc, 2394 bool GNUSyntax, 2395 Expr **IndexExprs, 2396 unsigned NumIndexExprs, 2397 Expr *Init) 2398 : Expr(DesignatedInitExprClass, Ty, 2399 Init->getValueKind(), Init->getObjectKind(), 2400 Init->isTypeDependent(), Init->isValueDependent()), 2401 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2402 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2403 this->Designators = new (C) Designator[NumDesignators]; 2404 2405 // Record the initializer itself. 2406 child_iterator Child = child_begin(); 2407 *Child++ = Init; 2408 2409 // Copy the designators and their subexpressions, computing 2410 // value-dependence along the way. 2411 unsigned IndexIdx = 0; 2412 for (unsigned I = 0; I != NumDesignators; ++I) { 2413 this->Designators[I] = Designators[I]; 2414 2415 if (this->Designators[I].isArrayDesignator()) { 2416 // Compute type- and value-dependence. 2417 Expr *Index = IndexExprs[IndexIdx]; 2418 ExprBits.ValueDependent = ExprBits.ValueDependent || 2419 Index->isTypeDependent() || Index->isValueDependent(); 2420 2421 // Copy the index expressions into permanent storage. 2422 *Child++ = IndexExprs[IndexIdx++]; 2423 } else if (this->Designators[I].isArrayRangeDesignator()) { 2424 // Compute type- and value-dependence. 2425 Expr *Start = IndexExprs[IndexIdx]; 2426 Expr *End = IndexExprs[IndexIdx + 1]; 2427 ExprBits.ValueDependent = ExprBits.ValueDependent || 2428 Start->isTypeDependent() || Start->isValueDependent() || 2429 End->isTypeDependent() || End->isValueDependent(); 2430 2431 // Copy the start/end expressions into permanent storage. 2432 *Child++ = IndexExprs[IndexIdx++]; 2433 *Child++ = IndexExprs[IndexIdx++]; 2434 } 2435 } 2436 2437 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2438} 2439 2440DesignatedInitExpr * 2441DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2442 unsigned NumDesignators, 2443 Expr **IndexExprs, unsigned NumIndexExprs, 2444 SourceLocation ColonOrEqualLoc, 2445 bool UsesColonSyntax, Expr *Init) { 2446 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2447 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2448 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2449 ColonOrEqualLoc, UsesColonSyntax, 2450 IndexExprs, NumIndexExprs, Init); 2451} 2452 2453DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2454 unsigned NumIndexExprs) { 2455 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2456 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2457 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2458} 2459 2460void DesignatedInitExpr::setDesignators(ASTContext &C, 2461 const Designator *Desigs, 2462 unsigned NumDesigs) { 2463 Designators = new (C) Designator[NumDesigs]; 2464 NumDesignators = NumDesigs; 2465 for (unsigned I = 0; I != NumDesigs; ++I) 2466 Designators[I] = Desigs[I]; 2467} 2468 2469SourceRange DesignatedInitExpr::getSourceRange() const { 2470 SourceLocation StartLoc; 2471 Designator &First = 2472 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2473 if (First.isFieldDesignator()) { 2474 if (GNUSyntax) 2475 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2476 else 2477 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2478 } else 2479 StartLoc = 2480 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2481 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2482} 2483 2484Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2485 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2486 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2487 Ptr += sizeof(DesignatedInitExpr); 2488 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2489 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2490} 2491 2492Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2493 assert(D.Kind == Designator::ArrayRangeDesignator && 2494 "Requires array range designator"); 2495 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2496 Ptr += sizeof(DesignatedInitExpr); 2497 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2498 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2499} 2500 2501Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2502 assert(D.Kind == Designator::ArrayRangeDesignator && 2503 "Requires array range designator"); 2504 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2505 Ptr += sizeof(DesignatedInitExpr); 2506 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2507 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2508} 2509 2510/// \brief Replaces the designator at index @p Idx with the series 2511/// of designators in [First, Last). 2512void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2513 const Designator *First, 2514 const Designator *Last) { 2515 unsigned NumNewDesignators = Last - First; 2516 if (NumNewDesignators == 0) { 2517 std::copy_backward(Designators + Idx + 1, 2518 Designators + NumDesignators, 2519 Designators + Idx); 2520 --NumNewDesignators; 2521 return; 2522 } else if (NumNewDesignators == 1) { 2523 Designators[Idx] = *First; 2524 return; 2525 } 2526 2527 Designator *NewDesignators 2528 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2529 std::copy(Designators, Designators + Idx, NewDesignators); 2530 std::copy(First, Last, NewDesignators + Idx); 2531 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2532 NewDesignators + Idx + NumNewDesignators); 2533 Designators = NewDesignators; 2534 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2535} 2536 2537ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2538 Expr **exprs, unsigned nexprs, 2539 SourceLocation rparenloc) 2540: Expr(ParenListExprClass, QualType(), VK_RValue, OK_Ordinary, 2541 hasAnyTypeDependentArguments(exprs, nexprs), 2542 hasAnyValueDependentArguments(exprs, nexprs)), 2543 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2544 2545 Exprs = new (C) Stmt*[nexprs]; 2546 for (unsigned i = 0; i != nexprs; ++i) 2547 Exprs[i] = exprs[i]; 2548} 2549 2550//===----------------------------------------------------------------------===// 2551// ExprIterator. 2552//===----------------------------------------------------------------------===// 2553 2554Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2555Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2556Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2557const Expr* ConstExprIterator::operator[](size_t idx) const { 2558 return cast<Expr>(I[idx]); 2559} 2560const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2561const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2562 2563//===----------------------------------------------------------------------===// 2564// Child Iterators for iterating over subexpressions/substatements 2565//===----------------------------------------------------------------------===// 2566 2567// DeclRefExpr 2568Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2569Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2570 2571// ObjCIvarRefExpr 2572Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2573Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2574 2575// ObjCPropertyRefExpr 2576Stmt::child_iterator ObjCPropertyRefExpr::child_begin() 2577{ 2578 if (Receiver.is<Stmt*>()) { 2579 // Hack alert! 2580 return reinterpret_cast<Stmt**> (&Receiver); 2581 } 2582 return child_iterator(); 2583} 2584 2585Stmt::child_iterator ObjCPropertyRefExpr::child_end() 2586{ return Receiver.is<Stmt*>() ? 2587 reinterpret_cast<Stmt**> (&Receiver)+1 : 2588 child_iterator(); 2589} 2590 2591// ObjCIsaExpr 2592Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2593Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2594 2595// PredefinedExpr 2596Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2597Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2598 2599// IntegerLiteral 2600Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2601Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2602 2603// CharacterLiteral 2604Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2605Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2606 2607// FloatingLiteral 2608Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2609Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2610 2611// ImaginaryLiteral 2612Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2613Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2614 2615// StringLiteral 2616Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2617Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2618 2619// ParenExpr 2620Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2621Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2622 2623// UnaryOperator 2624Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2625Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2626 2627// OffsetOfExpr 2628Stmt::child_iterator OffsetOfExpr::child_begin() { 2629 return reinterpret_cast<Stmt **> (reinterpret_cast<OffsetOfNode *> (this + 1) 2630 + NumComps); 2631} 2632Stmt::child_iterator OffsetOfExpr::child_end() { 2633 return child_iterator(&*child_begin() + NumExprs); 2634} 2635 2636// SizeOfAlignOfExpr 2637Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2638 // If this is of a type and the type is a VLA type (and not a typedef), the 2639 // size expression of the VLA needs to be treated as an executable expression. 2640 // Why isn't this weirdness documented better in StmtIterator? 2641 if (isArgumentType()) { 2642 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2643 getArgumentType().getTypePtr())) 2644 return child_iterator(T); 2645 return child_iterator(); 2646 } 2647 return child_iterator(&Argument.Ex); 2648} 2649Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2650 if (isArgumentType()) 2651 return child_iterator(); 2652 return child_iterator(&Argument.Ex + 1); 2653} 2654 2655// ArraySubscriptExpr 2656Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2657 return &SubExprs[0]; 2658} 2659Stmt::child_iterator ArraySubscriptExpr::child_end() { 2660 return &SubExprs[0]+END_EXPR; 2661} 2662 2663// CallExpr 2664Stmt::child_iterator CallExpr::child_begin() { 2665 return &SubExprs[0]; 2666} 2667Stmt::child_iterator CallExpr::child_end() { 2668 return &SubExprs[0]+NumArgs+ARGS_START; 2669} 2670 2671// MemberExpr 2672Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2673Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2674 2675// ExtVectorElementExpr 2676Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2677Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2678 2679// CompoundLiteralExpr 2680Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2681Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2682 2683// CastExpr 2684Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2685Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2686 2687// BinaryOperator 2688Stmt::child_iterator BinaryOperator::child_begin() { 2689 return &SubExprs[0]; 2690} 2691Stmt::child_iterator BinaryOperator::child_end() { 2692 return &SubExprs[0]+END_EXPR; 2693} 2694 2695// ConditionalOperator 2696Stmt::child_iterator ConditionalOperator::child_begin() { 2697 return &SubExprs[0]; 2698} 2699Stmt::child_iterator ConditionalOperator::child_end() { 2700 return &SubExprs[0]+END_EXPR; 2701} 2702 2703// AddrLabelExpr 2704Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2705Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2706 2707// StmtExpr 2708Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2709Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2710 2711// TypesCompatibleExpr 2712Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2713 return child_iterator(); 2714} 2715 2716Stmt::child_iterator TypesCompatibleExpr::child_end() { 2717 return child_iterator(); 2718} 2719 2720// ChooseExpr 2721Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2722Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2723 2724// GNUNullExpr 2725Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2726Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2727 2728// ShuffleVectorExpr 2729Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2730 return &SubExprs[0]; 2731} 2732Stmt::child_iterator ShuffleVectorExpr::child_end() { 2733 return &SubExprs[0]+NumExprs; 2734} 2735 2736// VAArgExpr 2737Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2738Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2739 2740// InitListExpr 2741Stmt::child_iterator InitListExpr::child_begin() { 2742 return InitExprs.size() ? &InitExprs[0] : 0; 2743} 2744Stmt::child_iterator InitListExpr::child_end() { 2745 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2746} 2747 2748// DesignatedInitExpr 2749Stmt::child_iterator DesignatedInitExpr::child_begin() { 2750 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2751 Ptr += sizeof(DesignatedInitExpr); 2752 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2753} 2754Stmt::child_iterator DesignatedInitExpr::child_end() { 2755 return child_iterator(&*child_begin() + NumSubExprs); 2756} 2757 2758// ImplicitValueInitExpr 2759Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2760 return child_iterator(); 2761} 2762 2763Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2764 return child_iterator(); 2765} 2766 2767// ParenListExpr 2768Stmt::child_iterator ParenListExpr::child_begin() { 2769 return &Exprs[0]; 2770} 2771Stmt::child_iterator ParenListExpr::child_end() { 2772 return &Exprs[0]+NumExprs; 2773} 2774 2775// ObjCStringLiteral 2776Stmt::child_iterator ObjCStringLiteral::child_begin() { 2777 return &String; 2778} 2779Stmt::child_iterator ObjCStringLiteral::child_end() { 2780 return &String+1; 2781} 2782 2783// ObjCEncodeExpr 2784Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2785Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2786 2787// ObjCSelectorExpr 2788Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2789 return child_iterator(); 2790} 2791Stmt::child_iterator ObjCSelectorExpr::child_end() { 2792 return child_iterator(); 2793} 2794 2795// ObjCProtocolExpr 2796Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2797 return child_iterator(); 2798} 2799Stmt::child_iterator ObjCProtocolExpr::child_end() { 2800 return child_iterator(); 2801} 2802 2803// ObjCMessageExpr 2804Stmt::child_iterator ObjCMessageExpr::child_begin() { 2805 if (getReceiverKind() == Instance) 2806 return reinterpret_cast<Stmt **>(this + 1); 2807 return getArgs(); 2808} 2809Stmt::child_iterator ObjCMessageExpr::child_end() { 2810 return getArgs() + getNumArgs(); 2811} 2812 2813// Blocks 2814Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2815Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2816 2817Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2818Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2819 2820// OpaqueValueExpr 2821SourceRange OpaqueValueExpr::getSourceRange() const { return SourceRange(); } 2822Stmt::child_iterator OpaqueValueExpr::child_begin() { return child_iterator(); } 2823Stmt::child_iterator OpaqueValueExpr::child_end() { return child_iterator(); } 2824 2825