Expr.cpp revision daa8e4e888758d55a7a759dd4a91b83921cef222
1//===--- Expr.cpp - Expression AST Node Implementation --------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the Expr class and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/AST/Expr.h" 15#include "clang/AST/ExprCXX.h" 16#include "clang/AST/APValue.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclCXX.h" 20#include "clang/AST/DeclTemplate.h" 21#include "clang/AST/RecordLayout.h" 22#include "clang/AST/StmtVisitor.h" 23#include "clang/Basic/Builtins.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/Support/ErrorHandling.h" 26#include "llvm/Support/raw_ostream.h" 27#include <algorithm> 28using namespace clang; 29 30void Expr::ANCHOR() {} // key function for Expr class. 31 32/// isKnownToHaveBooleanValue - Return true if this is an integer expression 33/// that is known to return 0 or 1. This happens for _Bool/bool expressions 34/// but also int expressions which are produced by things like comparisons in 35/// C. 36bool Expr::isKnownToHaveBooleanValue() const { 37 // If this value has _Bool type, it is obvious 0/1. 38 if (getType()->isBooleanType()) return true; 39 // If this is a non-scalar-integer type, we don't care enough to try. 40 if (!getType()->isIntegralOrEnumerationType()) return false; 41 42 if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) 43 return PE->getSubExpr()->isKnownToHaveBooleanValue(); 44 45 if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(this)) { 46 switch (UO->getOpcode()) { 47 case UO_Plus: 48 case UO_Extension: 49 return UO->getSubExpr()->isKnownToHaveBooleanValue(); 50 default: 51 return false; 52 } 53 } 54 55 // Only look through implicit casts. If the user writes 56 // '(int) (a && b)' treat it as an arbitrary int. 57 if (const ImplicitCastExpr *CE = dyn_cast<ImplicitCastExpr>(this)) 58 return CE->getSubExpr()->isKnownToHaveBooleanValue(); 59 60 if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(this)) { 61 switch (BO->getOpcode()) { 62 default: return false; 63 case BO_LT: // Relational operators. 64 case BO_GT: 65 case BO_LE: 66 case BO_GE: 67 case BO_EQ: // Equality operators. 68 case BO_NE: 69 case BO_LAnd: // AND operator. 70 case BO_LOr: // Logical OR operator. 71 return true; 72 73 case BO_And: // Bitwise AND operator. 74 case BO_Xor: // Bitwise XOR operator. 75 case BO_Or: // Bitwise OR operator. 76 // Handle things like (x==2)|(y==12). 77 return BO->getLHS()->isKnownToHaveBooleanValue() && 78 BO->getRHS()->isKnownToHaveBooleanValue(); 79 80 case BO_Comma: 81 case BO_Assign: 82 return BO->getRHS()->isKnownToHaveBooleanValue(); 83 } 84 } 85 86 if (const ConditionalOperator *CO = dyn_cast<ConditionalOperator>(this)) 87 return CO->getTrueExpr()->isKnownToHaveBooleanValue() && 88 CO->getFalseExpr()->isKnownToHaveBooleanValue(); 89 90 return false; 91} 92 93//===----------------------------------------------------------------------===// 94// Primary Expressions. 95//===----------------------------------------------------------------------===// 96 97void ExplicitTemplateArgumentList::initializeFrom( 98 const TemplateArgumentListInfo &Info) { 99 LAngleLoc = Info.getLAngleLoc(); 100 RAngleLoc = Info.getRAngleLoc(); 101 NumTemplateArgs = Info.size(); 102 103 TemplateArgumentLoc *ArgBuffer = getTemplateArgs(); 104 for (unsigned i = 0; i != NumTemplateArgs; ++i) 105 new (&ArgBuffer[i]) TemplateArgumentLoc(Info[i]); 106} 107 108void ExplicitTemplateArgumentList::copyInto( 109 TemplateArgumentListInfo &Info) const { 110 Info.setLAngleLoc(LAngleLoc); 111 Info.setRAngleLoc(RAngleLoc); 112 for (unsigned I = 0; I != NumTemplateArgs; ++I) 113 Info.addArgument(getTemplateArgs()[I]); 114} 115 116std::size_t ExplicitTemplateArgumentList::sizeFor(unsigned NumTemplateArgs) { 117 return sizeof(ExplicitTemplateArgumentList) + 118 sizeof(TemplateArgumentLoc) * NumTemplateArgs; 119} 120 121std::size_t ExplicitTemplateArgumentList::sizeFor( 122 const TemplateArgumentListInfo &Info) { 123 return sizeFor(Info.size()); 124} 125 126void DeclRefExpr::computeDependence() { 127 ExprBits.TypeDependent = false; 128 ExprBits.ValueDependent = false; 129 130 NamedDecl *D = getDecl(); 131 132 // (TD) C++ [temp.dep.expr]p3: 133 // An id-expression is type-dependent if it contains: 134 // 135 // and 136 // 137 // (VD) C++ [temp.dep.constexpr]p2: 138 // An identifier is value-dependent if it is: 139 140 // (TD) - an identifier that was declared with dependent type 141 // (VD) - a name declared with a dependent type, 142 if (getType()->isDependentType()) { 143 ExprBits.TypeDependent = true; 144 ExprBits.ValueDependent = true; 145 } 146 // (TD) - a conversion-function-id that specifies a dependent type 147 else if (D->getDeclName().getNameKind() 148 == DeclarationName::CXXConversionFunctionName && 149 D->getDeclName().getCXXNameType()->isDependentType()) { 150 ExprBits.TypeDependent = true; 151 ExprBits.ValueDependent = true; 152 } 153 // (TD) - a template-id that is dependent, 154 else if (hasExplicitTemplateArgs() && 155 TemplateSpecializationType::anyDependentTemplateArguments( 156 getTemplateArgs(), 157 getNumTemplateArgs())) { 158 ExprBits.TypeDependent = true; 159 ExprBits.ValueDependent = true; 160 } 161 // (VD) - the name of a non-type template parameter, 162 else if (isa<NonTypeTemplateParmDecl>(D)) 163 ExprBits.ValueDependent = true; 164 // (VD) - a constant with integral or enumeration type and is 165 // initialized with an expression that is value-dependent. 166 else if (VarDecl *Var = dyn_cast<VarDecl>(D)) { 167 if (Var->getType()->isIntegralOrEnumerationType() && 168 Var->getType().getCVRQualifiers() == Qualifiers::Const) { 169 if (const Expr *Init = Var->getAnyInitializer()) 170 if (Init->isValueDependent()) 171 ExprBits.ValueDependent = true; 172 } 173 // (VD) - FIXME: Missing from the standard: 174 // - a member function or a static data member of the current 175 // instantiation 176 else if (Var->isStaticDataMember() && 177 Var->getDeclContext()->isDependentContext()) 178 ExprBits.ValueDependent = true; 179 } 180 // (VD) - FIXME: Missing from the standard: 181 // - a member function or a static data member of the current 182 // instantiation 183 else if (isa<CXXMethodDecl>(D) && D->getDeclContext()->isDependentContext()) 184 ExprBits.ValueDependent = true; 185 // (TD) - a nested-name-specifier or a qualified-id that names a 186 // member of an unknown specialization. 187 // (handled by DependentScopeDeclRefExpr) 188} 189 190DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 191 SourceRange QualifierRange, 192 ValueDecl *D, SourceLocation NameLoc, 193 const TemplateArgumentListInfo *TemplateArgs, 194 QualType T) 195 : Expr(DeclRefExprClass, T, false, false), 196 DecoratedD(D, 197 (Qualifier? HasQualifierFlag : 0) | 198 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 199 Loc(NameLoc) { 200 if (Qualifier) { 201 NameQualifier *NQ = getNameQualifier(); 202 NQ->NNS = Qualifier; 203 NQ->Range = QualifierRange; 204 } 205 206 if (TemplateArgs) 207 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 208 209 computeDependence(); 210} 211 212DeclRefExpr::DeclRefExpr(NestedNameSpecifier *Qualifier, 213 SourceRange QualifierRange, 214 ValueDecl *D, const DeclarationNameInfo &NameInfo, 215 const TemplateArgumentListInfo *TemplateArgs, 216 QualType T) 217 : Expr(DeclRefExprClass, T, false, false), 218 DecoratedD(D, 219 (Qualifier? HasQualifierFlag : 0) | 220 (TemplateArgs ? HasExplicitTemplateArgumentListFlag : 0)), 221 Loc(NameInfo.getLoc()), DNLoc(NameInfo.getInfo()) { 222 if (Qualifier) { 223 NameQualifier *NQ = getNameQualifier(); 224 NQ->NNS = Qualifier; 225 NQ->Range = QualifierRange; 226 } 227 228 if (TemplateArgs) 229 getExplicitTemplateArgs().initializeFrom(*TemplateArgs); 230 231 computeDependence(); 232} 233 234DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 235 NestedNameSpecifier *Qualifier, 236 SourceRange QualifierRange, 237 ValueDecl *D, 238 SourceLocation NameLoc, 239 QualType T, 240 const TemplateArgumentListInfo *TemplateArgs) { 241 return Create(Context, Qualifier, QualifierRange, D, 242 DeclarationNameInfo(D->getDeclName(), NameLoc), 243 T, TemplateArgs); 244} 245 246DeclRefExpr *DeclRefExpr::Create(ASTContext &Context, 247 NestedNameSpecifier *Qualifier, 248 SourceRange QualifierRange, 249 ValueDecl *D, 250 const DeclarationNameInfo &NameInfo, 251 QualType T, 252 const TemplateArgumentListInfo *TemplateArgs) { 253 std::size_t Size = sizeof(DeclRefExpr); 254 if (Qualifier != 0) 255 Size += sizeof(NameQualifier); 256 257 if (TemplateArgs) 258 Size += ExplicitTemplateArgumentList::sizeFor(*TemplateArgs); 259 260 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 261 return new (Mem) DeclRefExpr(Qualifier, QualifierRange, D, NameInfo, 262 TemplateArgs, T); 263} 264 265DeclRefExpr *DeclRefExpr::CreateEmpty(ASTContext &Context, bool HasQualifier, 266 unsigned NumTemplateArgs) { 267 std::size_t Size = sizeof(DeclRefExpr); 268 if (HasQualifier) 269 Size += sizeof(NameQualifier); 270 271 if (NumTemplateArgs) 272 Size += ExplicitTemplateArgumentList::sizeFor(NumTemplateArgs); 273 274 void *Mem = Context.Allocate(Size, llvm::alignOf<DeclRefExpr>()); 275 return new (Mem) DeclRefExpr(EmptyShell()); 276} 277 278SourceRange DeclRefExpr::getSourceRange() const { 279 SourceRange R = getNameInfo().getSourceRange(); 280 if (hasQualifier()) 281 R.setBegin(getQualifierRange().getBegin()); 282 if (hasExplicitTemplateArgs()) 283 R.setEnd(getRAngleLoc()); 284 return R; 285} 286 287// FIXME: Maybe this should use DeclPrinter with a special "print predefined 288// expr" policy instead. 289std::string PredefinedExpr::ComputeName(IdentType IT, const Decl *CurrentDecl) { 290 ASTContext &Context = CurrentDecl->getASTContext(); 291 292 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CurrentDecl)) { 293 if (IT != PrettyFunction && IT != PrettyFunctionNoVirtual) 294 return FD->getNameAsString(); 295 296 llvm::SmallString<256> Name; 297 llvm::raw_svector_ostream Out(Name); 298 299 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 300 if (MD->isVirtual() && IT != PrettyFunctionNoVirtual) 301 Out << "virtual "; 302 if (MD->isStatic()) 303 Out << "static "; 304 } 305 306 PrintingPolicy Policy(Context.getLangOptions()); 307 308 std::string Proto = FD->getQualifiedNameAsString(Policy); 309 310 const FunctionType *AFT = FD->getType()->getAs<FunctionType>(); 311 const FunctionProtoType *FT = 0; 312 if (FD->hasWrittenPrototype()) 313 FT = dyn_cast<FunctionProtoType>(AFT); 314 315 Proto += "("; 316 if (FT) { 317 llvm::raw_string_ostream POut(Proto); 318 for (unsigned i = 0, e = FD->getNumParams(); i != e; ++i) { 319 if (i) POut << ", "; 320 std::string Param; 321 FD->getParamDecl(i)->getType().getAsStringInternal(Param, Policy); 322 POut << Param; 323 } 324 325 if (FT->isVariadic()) { 326 if (FD->getNumParams()) POut << ", "; 327 POut << "..."; 328 } 329 } 330 Proto += ")"; 331 332 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 333 Qualifiers ThisQuals = Qualifiers::fromCVRMask(MD->getTypeQualifiers()); 334 if (ThisQuals.hasConst()) 335 Proto += " const"; 336 if (ThisQuals.hasVolatile()) 337 Proto += " volatile"; 338 } 339 340 if (!isa<CXXConstructorDecl>(FD) && !isa<CXXDestructorDecl>(FD)) 341 AFT->getResultType().getAsStringInternal(Proto, Policy); 342 343 Out << Proto; 344 345 Out.flush(); 346 return Name.str().str(); 347 } 348 if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurrentDecl)) { 349 llvm::SmallString<256> Name; 350 llvm::raw_svector_ostream Out(Name); 351 Out << (MD->isInstanceMethod() ? '-' : '+'); 352 Out << '['; 353 354 // For incorrect code, there might not be an ObjCInterfaceDecl. Do 355 // a null check to avoid a crash. 356 if (const ObjCInterfaceDecl *ID = MD->getClassInterface()) 357 Out << ID; 358 359 if (const ObjCCategoryImplDecl *CID = 360 dyn_cast<ObjCCategoryImplDecl>(MD->getDeclContext())) 361 Out << '(' << CID << ')'; 362 363 Out << ' '; 364 Out << MD->getSelector().getAsString(); 365 Out << ']'; 366 367 Out.flush(); 368 return Name.str().str(); 369 } 370 if (isa<TranslationUnitDecl>(CurrentDecl) && IT == PrettyFunction) { 371 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 372 return "top level"; 373 } 374 return ""; 375} 376 377void APNumericStorage::setIntValue(ASTContext &C, const llvm::APInt &Val) { 378 if (hasAllocation()) 379 C.Deallocate(pVal); 380 381 BitWidth = Val.getBitWidth(); 382 unsigned NumWords = Val.getNumWords(); 383 const uint64_t* Words = Val.getRawData(); 384 if (NumWords > 1) { 385 pVal = new (C) uint64_t[NumWords]; 386 std::copy(Words, Words + NumWords, pVal); 387 } else if (NumWords == 1) 388 VAL = Words[0]; 389 else 390 VAL = 0; 391} 392 393IntegerLiteral * 394IntegerLiteral::Create(ASTContext &C, const llvm::APInt &V, 395 QualType type, SourceLocation l) { 396 return new (C) IntegerLiteral(C, V, type, l); 397} 398 399IntegerLiteral * 400IntegerLiteral::Create(ASTContext &C, EmptyShell Empty) { 401 return new (C) IntegerLiteral(Empty); 402} 403 404FloatingLiteral * 405FloatingLiteral::Create(ASTContext &C, const llvm::APFloat &V, 406 bool isexact, QualType Type, SourceLocation L) { 407 return new (C) FloatingLiteral(C, V, isexact, Type, L); 408} 409 410FloatingLiteral * 411FloatingLiteral::Create(ASTContext &C, EmptyShell Empty) { 412 return new (C) FloatingLiteral(Empty); 413} 414 415/// getValueAsApproximateDouble - This returns the value as an inaccurate 416/// double. Note that this may cause loss of precision, but is useful for 417/// debugging dumps, etc. 418double FloatingLiteral::getValueAsApproximateDouble() const { 419 llvm::APFloat V = getValue(); 420 bool ignored; 421 V.convert(llvm::APFloat::IEEEdouble, llvm::APFloat::rmNearestTiesToEven, 422 &ignored); 423 return V.convertToDouble(); 424} 425 426StringLiteral *StringLiteral::Create(ASTContext &C, const char *StrData, 427 unsigned ByteLength, bool Wide, 428 QualType Ty, 429 const SourceLocation *Loc, 430 unsigned NumStrs) { 431 // Allocate enough space for the StringLiteral plus an array of locations for 432 // any concatenated string tokens. 433 void *Mem = C.Allocate(sizeof(StringLiteral)+ 434 sizeof(SourceLocation)*(NumStrs-1), 435 llvm::alignOf<StringLiteral>()); 436 StringLiteral *SL = new (Mem) StringLiteral(Ty); 437 438 // OPTIMIZE: could allocate this appended to the StringLiteral. 439 char *AStrData = new (C, 1) char[ByteLength]; 440 memcpy(AStrData, StrData, ByteLength); 441 SL->StrData = AStrData; 442 SL->ByteLength = ByteLength; 443 SL->IsWide = Wide; 444 SL->TokLocs[0] = Loc[0]; 445 SL->NumConcatenated = NumStrs; 446 447 if (NumStrs != 1) 448 memcpy(&SL->TokLocs[1], Loc+1, sizeof(SourceLocation)*(NumStrs-1)); 449 return SL; 450} 451 452StringLiteral *StringLiteral::CreateEmpty(ASTContext &C, unsigned NumStrs) { 453 void *Mem = C.Allocate(sizeof(StringLiteral)+ 454 sizeof(SourceLocation)*(NumStrs-1), 455 llvm::alignOf<StringLiteral>()); 456 StringLiteral *SL = new (Mem) StringLiteral(QualType()); 457 SL->StrData = 0; 458 SL->ByteLength = 0; 459 SL->NumConcatenated = NumStrs; 460 return SL; 461} 462 463void StringLiteral::setString(ASTContext &C, llvm::StringRef Str) { 464 char *AStrData = new (C, 1) char[Str.size()]; 465 memcpy(AStrData, Str.data(), Str.size()); 466 StrData = AStrData; 467 ByteLength = Str.size(); 468} 469 470/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 471/// corresponds to, e.g. "sizeof" or "[pre]++". 472const char *UnaryOperator::getOpcodeStr(Opcode Op) { 473 switch (Op) { 474 default: assert(0 && "Unknown unary operator"); 475 case UO_PostInc: return "++"; 476 case UO_PostDec: return "--"; 477 case UO_PreInc: return "++"; 478 case UO_PreDec: return "--"; 479 case UO_AddrOf: return "&"; 480 case UO_Deref: return "*"; 481 case UO_Plus: return "+"; 482 case UO_Minus: return "-"; 483 case UO_Not: return "~"; 484 case UO_LNot: return "!"; 485 case UO_Real: return "__real"; 486 case UO_Imag: return "__imag"; 487 case UO_Extension: return "__extension__"; 488 } 489} 490 491UnaryOperatorKind 492UnaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix) { 493 switch (OO) { 494 default: assert(false && "No unary operator for overloaded function"); 495 case OO_PlusPlus: return Postfix ? UO_PostInc : UO_PreInc; 496 case OO_MinusMinus: return Postfix ? UO_PostDec : UO_PreDec; 497 case OO_Amp: return UO_AddrOf; 498 case OO_Star: return UO_Deref; 499 case OO_Plus: return UO_Plus; 500 case OO_Minus: return UO_Minus; 501 case OO_Tilde: return UO_Not; 502 case OO_Exclaim: return UO_LNot; 503 } 504} 505 506OverloadedOperatorKind UnaryOperator::getOverloadedOperator(Opcode Opc) { 507 switch (Opc) { 508 case UO_PostInc: case UO_PreInc: return OO_PlusPlus; 509 case UO_PostDec: case UO_PreDec: return OO_MinusMinus; 510 case UO_AddrOf: return OO_Amp; 511 case UO_Deref: return OO_Star; 512 case UO_Plus: return OO_Plus; 513 case UO_Minus: return OO_Minus; 514 case UO_Not: return OO_Tilde; 515 case UO_LNot: return OO_Exclaim; 516 default: return OO_None; 517 } 518} 519 520 521//===----------------------------------------------------------------------===// 522// Postfix Operators. 523//===----------------------------------------------------------------------===// 524 525CallExpr::CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, 526 unsigned numargs, QualType t, SourceLocation rparenloc) 527 : Expr(SC, t, 528 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 529 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 530 NumArgs(numargs) { 531 532 SubExprs = new (C) Stmt*[numargs+1]; 533 SubExprs[FN] = fn; 534 for (unsigned i = 0; i != numargs; ++i) 535 SubExprs[i+ARGS_START] = args[i]; 536 537 RParenLoc = rparenloc; 538} 539 540CallExpr::CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, 541 QualType t, SourceLocation rparenloc) 542 : Expr(CallExprClass, t, 543 fn->isTypeDependent() || hasAnyTypeDependentArguments(args, numargs), 544 fn->isValueDependent() || hasAnyValueDependentArguments(args,numargs)), 545 NumArgs(numargs) { 546 547 SubExprs = new (C) Stmt*[numargs+1]; 548 SubExprs[FN] = fn; 549 for (unsigned i = 0; i != numargs; ++i) 550 SubExprs[i+ARGS_START] = args[i]; 551 552 RParenLoc = rparenloc; 553} 554 555CallExpr::CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty) 556 : Expr(SC, Empty), SubExprs(0), NumArgs(0) { 557 SubExprs = new (C) Stmt*[1]; 558} 559 560Decl *CallExpr::getCalleeDecl() { 561 Expr *CEE = getCallee()->IgnoreParenCasts(); 562 // If we're calling a dereference, look at the pointer instead. 563 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(CEE)) { 564 if (BO->isPtrMemOp()) 565 CEE = BO->getRHS()->IgnoreParenCasts(); 566 } else if (UnaryOperator *UO = dyn_cast<UnaryOperator>(CEE)) { 567 if (UO->getOpcode() == UO_Deref) 568 CEE = UO->getSubExpr()->IgnoreParenCasts(); 569 } 570 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(CEE)) 571 return DRE->getDecl(); 572 if (MemberExpr *ME = dyn_cast<MemberExpr>(CEE)) 573 return ME->getMemberDecl(); 574 575 return 0; 576} 577 578FunctionDecl *CallExpr::getDirectCallee() { 579 return dyn_cast_or_null<FunctionDecl>(getCalleeDecl()); 580} 581 582/// setNumArgs - This changes the number of arguments present in this call. 583/// Any orphaned expressions are deleted by this, and any new operands are set 584/// to null. 585void CallExpr::setNumArgs(ASTContext& C, unsigned NumArgs) { 586 // No change, just return. 587 if (NumArgs == getNumArgs()) return; 588 589 // If shrinking # arguments, just delete the extras and forgot them. 590 if (NumArgs < getNumArgs()) { 591 this->NumArgs = NumArgs; 592 return; 593 } 594 595 // Otherwise, we are growing the # arguments. New an bigger argument array. 596 Stmt **NewSubExprs = new (C) Stmt*[NumArgs+1]; 597 // Copy over args. 598 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 599 NewSubExprs[i] = SubExprs[i]; 600 // Null out new args. 601 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 602 NewSubExprs[i] = 0; 603 604 if (SubExprs) C.Deallocate(SubExprs); 605 SubExprs = NewSubExprs; 606 this->NumArgs = NumArgs; 607} 608 609/// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 610/// not, return 0. 611unsigned CallExpr::isBuiltinCall(ASTContext &Context) const { 612 // All simple function calls (e.g. func()) are implicitly cast to pointer to 613 // function. As a result, we try and obtain the DeclRefExpr from the 614 // ImplicitCastExpr. 615 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 616 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 617 return 0; 618 619 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 620 if (!DRE) 621 return 0; 622 623 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 624 if (!FDecl) 625 return 0; 626 627 if (!FDecl->getIdentifier()) 628 return 0; 629 630 return FDecl->getBuiltinID(); 631} 632 633QualType CallExpr::getCallReturnType() const { 634 QualType CalleeType = getCallee()->getType(); 635 if (const PointerType *FnTypePtr = CalleeType->getAs<PointerType>()) 636 CalleeType = FnTypePtr->getPointeeType(); 637 else if (const BlockPointerType *BPT = CalleeType->getAs<BlockPointerType>()) 638 CalleeType = BPT->getPointeeType(); 639 else if (const MemberPointerType *MPT 640 = CalleeType->getAs<MemberPointerType>()) 641 CalleeType = MPT->getPointeeType(); 642 643 const FunctionType *FnType = CalleeType->getAs<FunctionType>(); 644 return FnType->getResultType(); 645} 646 647OffsetOfExpr *OffsetOfExpr::Create(ASTContext &C, QualType type, 648 SourceLocation OperatorLoc, 649 TypeSourceInfo *tsi, 650 OffsetOfNode* compsPtr, unsigned numComps, 651 Expr** exprsPtr, unsigned numExprs, 652 SourceLocation RParenLoc) { 653 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 654 sizeof(OffsetOfNode) * numComps + 655 sizeof(Expr*) * numExprs); 656 657 return new (Mem) OffsetOfExpr(C, type, OperatorLoc, tsi, compsPtr, numComps, 658 exprsPtr, numExprs, RParenLoc); 659} 660 661OffsetOfExpr *OffsetOfExpr::CreateEmpty(ASTContext &C, 662 unsigned numComps, unsigned numExprs) { 663 void *Mem = C.Allocate(sizeof(OffsetOfExpr) + 664 sizeof(OffsetOfNode) * numComps + 665 sizeof(Expr*) * numExprs); 666 return new (Mem) OffsetOfExpr(numComps, numExprs); 667} 668 669OffsetOfExpr::OffsetOfExpr(ASTContext &C, QualType type, 670 SourceLocation OperatorLoc, TypeSourceInfo *tsi, 671 OffsetOfNode* compsPtr, unsigned numComps, 672 Expr** exprsPtr, unsigned numExprs, 673 SourceLocation RParenLoc) 674 : Expr(OffsetOfExprClass, type, /*TypeDependent=*/false, 675 /*ValueDependent=*/tsi->getType()->isDependentType() || 676 hasAnyTypeDependentArguments(exprsPtr, numExprs) || 677 hasAnyValueDependentArguments(exprsPtr, numExprs)), 678 OperatorLoc(OperatorLoc), RParenLoc(RParenLoc), TSInfo(tsi), 679 NumComps(numComps), NumExprs(numExprs) 680{ 681 for(unsigned i = 0; i < numComps; ++i) { 682 setComponent(i, compsPtr[i]); 683 } 684 685 for(unsigned i = 0; i < numExprs; ++i) { 686 setIndexExpr(i, exprsPtr[i]); 687 } 688} 689 690IdentifierInfo *OffsetOfExpr::OffsetOfNode::getFieldName() const { 691 assert(getKind() == Field || getKind() == Identifier); 692 if (getKind() == Field) 693 return getField()->getIdentifier(); 694 695 return reinterpret_cast<IdentifierInfo *> (Data & ~(uintptr_t)Mask); 696} 697 698MemberExpr *MemberExpr::Create(ASTContext &C, Expr *base, bool isarrow, 699 NestedNameSpecifier *qual, 700 SourceRange qualrange, 701 ValueDecl *memberdecl, 702 DeclAccessPair founddecl, 703 DeclarationNameInfo nameinfo, 704 const TemplateArgumentListInfo *targs, 705 QualType ty) { 706 std::size_t Size = sizeof(MemberExpr); 707 708 bool hasQualOrFound = (qual != 0 || 709 founddecl.getDecl() != memberdecl || 710 founddecl.getAccess() != memberdecl->getAccess()); 711 if (hasQualOrFound) 712 Size += sizeof(MemberNameQualifier); 713 714 if (targs) 715 Size += ExplicitTemplateArgumentList::sizeFor(*targs); 716 717 void *Mem = C.Allocate(Size, llvm::alignOf<MemberExpr>()); 718 MemberExpr *E = new (Mem) MemberExpr(base, isarrow, memberdecl, nameinfo, ty); 719 720 if (hasQualOrFound) { 721 if (qual && qual->isDependent()) { 722 E->setValueDependent(true); 723 E->setTypeDependent(true); 724 } 725 E->HasQualifierOrFoundDecl = true; 726 727 MemberNameQualifier *NQ = E->getMemberQualifier(); 728 NQ->NNS = qual; 729 NQ->Range = qualrange; 730 NQ->FoundDecl = founddecl; 731 } 732 733 if (targs) { 734 E->HasExplicitTemplateArgumentList = true; 735 E->getExplicitTemplateArgs().initializeFrom(*targs); 736 } 737 738 return E; 739} 740 741const char *CastExpr::getCastKindName() const { 742 switch (getCastKind()) { 743 case CK_Unknown: 744 return "Unknown"; 745 case CK_Dependent: 746 return "Dependent"; 747 case CK_BitCast: 748 return "BitCast"; 749 case CK_LValueBitCast: 750 return "LValueBitCast"; 751 case CK_NoOp: 752 return "NoOp"; 753 case CK_BaseToDerived: 754 return "BaseToDerived"; 755 case CK_DerivedToBase: 756 return "DerivedToBase"; 757 case CK_UncheckedDerivedToBase: 758 return "UncheckedDerivedToBase"; 759 case CK_Dynamic: 760 return "Dynamic"; 761 case CK_ToUnion: 762 return "ToUnion"; 763 case CK_ArrayToPointerDecay: 764 return "ArrayToPointerDecay"; 765 case CK_FunctionToPointerDecay: 766 return "FunctionToPointerDecay"; 767 case CK_NullToMemberPointer: 768 return "NullToMemberPointer"; 769 case CK_NullToPointer: 770 return "NullToPointer"; 771 case CK_BaseToDerivedMemberPointer: 772 return "BaseToDerivedMemberPointer"; 773 case CK_DerivedToBaseMemberPointer: 774 return "DerivedToBaseMemberPointer"; 775 case CK_UserDefinedConversion: 776 return "UserDefinedConversion"; 777 case CK_ConstructorConversion: 778 return "ConstructorConversion"; 779 case CK_IntegralToPointer: 780 return "IntegralToPointer"; 781 case CK_PointerToIntegral: 782 return "PointerToIntegral"; 783 case CK_PointerToBoolean: 784 return "PointerToBoolean"; 785 case CK_ToVoid: 786 return "ToVoid"; 787 case CK_VectorSplat: 788 return "VectorSplat"; 789 case CK_IntegralCast: 790 return "IntegralCast"; 791 case CK_IntegralToBoolean: 792 return "IntegralToBoolean"; 793 case CK_IntegralToFloating: 794 return "IntegralToFloating"; 795 case CK_FloatingToIntegral: 796 return "FloatingToIntegral"; 797 case CK_FloatingCast: 798 return "FloatingCast"; 799 case CK_FloatingToBoolean: 800 return "FloatingToBoolean"; 801 case CK_MemberPointerToBoolean: 802 return "MemberPointerToBoolean"; 803 case CK_AnyPointerToObjCPointerCast: 804 return "AnyPointerToObjCPointerCast"; 805 case CK_AnyPointerToBlockPointerCast: 806 return "AnyPointerToBlockPointerCast"; 807 case CK_ObjCObjectLValueCast: 808 return "ObjCObjectLValueCast"; 809 case CK_FloatingRealToComplex: 810 return "FloatingRealToComplex"; 811 case CK_FloatingComplexToReal: 812 return "FloatingComplexToReal"; 813 case CK_FloatingComplexToBoolean: 814 return "FloatingComplexToBoolean"; 815 case CK_FloatingComplexCast: 816 return "FloatingComplexCast"; 817 case CK_FloatingComplexToIntegralComplex: 818 return "FloatingComplexToIntegralComplex"; 819 case CK_IntegralRealToComplex: 820 return "IntegralRealToComplex"; 821 case CK_IntegralComplexToReal: 822 return "IntegralComplexToReal"; 823 case CK_IntegralComplexToBoolean: 824 return "IntegralComplexToBoolean"; 825 case CK_IntegralComplexCast: 826 return "IntegralComplexCast"; 827 case CK_IntegralComplexToFloatingComplex: 828 return "IntegralComplexToFloatingComplex"; 829 } 830 831 llvm_unreachable("Unhandled cast kind!"); 832 return 0; 833} 834 835Expr *CastExpr::getSubExprAsWritten() { 836 Expr *SubExpr = 0; 837 CastExpr *E = this; 838 do { 839 SubExpr = E->getSubExpr(); 840 841 // Skip any temporary bindings; they're implicit. 842 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 843 SubExpr = Binder->getSubExpr(); 844 845 // Conversions by constructor and conversion functions have a 846 // subexpression describing the call; strip it off. 847 if (E->getCastKind() == CK_ConstructorConversion) 848 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 849 else if (E->getCastKind() == CK_UserDefinedConversion) 850 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 851 852 // If the subexpression we're left with is an implicit cast, look 853 // through that, too. 854 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 855 856 return SubExpr; 857} 858 859CXXBaseSpecifier **CastExpr::path_buffer() { 860 switch (getStmtClass()) { 861#define ABSTRACT_STMT(x) 862#define CASTEXPR(Type, Base) \ 863 case Stmt::Type##Class: \ 864 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 865#define STMT(Type, Base) 866#include "clang/AST/StmtNodes.inc" 867 default: 868 llvm_unreachable("non-cast expressions not possible here"); 869 return 0; 870 } 871} 872 873void CastExpr::setCastPath(const CXXCastPath &Path) { 874 assert(Path.size() == path_size()); 875 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 876} 877 878ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 879 CastKind Kind, Expr *Operand, 880 const CXXCastPath *BasePath, 881 ExprValueKind VK) { 882 unsigned PathSize = (BasePath ? BasePath->size() : 0); 883 void *Buffer = 884 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 885 ImplicitCastExpr *E = 886 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 887 if (PathSize) E->setCastPath(*BasePath); 888 return E; 889} 890 891ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 892 unsigned PathSize) { 893 void *Buffer = 894 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 895 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 896} 897 898 899CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 900 CastKind K, Expr *Op, 901 const CXXCastPath *BasePath, 902 TypeSourceInfo *WrittenTy, 903 SourceLocation L, SourceLocation R) { 904 unsigned PathSize = (BasePath ? BasePath->size() : 0); 905 void *Buffer = 906 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 907 CStyleCastExpr *E = 908 new (Buffer) CStyleCastExpr(T, K, Op, PathSize, WrittenTy, L, R); 909 if (PathSize) E->setCastPath(*BasePath); 910 return E; 911} 912 913CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 914 void *Buffer = 915 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 916 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 917} 918 919/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 920/// corresponds to, e.g. "<<=". 921const char *BinaryOperator::getOpcodeStr(Opcode Op) { 922 switch (Op) { 923 case BO_PtrMemD: return ".*"; 924 case BO_PtrMemI: return "->*"; 925 case BO_Mul: return "*"; 926 case BO_Div: return "/"; 927 case BO_Rem: return "%"; 928 case BO_Add: return "+"; 929 case BO_Sub: return "-"; 930 case BO_Shl: return "<<"; 931 case BO_Shr: return ">>"; 932 case BO_LT: return "<"; 933 case BO_GT: return ">"; 934 case BO_LE: return "<="; 935 case BO_GE: return ">="; 936 case BO_EQ: return "=="; 937 case BO_NE: return "!="; 938 case BO_And: return "&"; 939 case BO_Xor: return "^"; 940 case BO_Or: return "|"; 941 case BO_LAnd: return "&&"; 942 case BO_LOr: return "||"; 943 case BO_Assign: return "="; 944 case BO_MulAssign: return "*="; 945 case BO_DivAssign: return "/="; 946 case BO_RemAssign: return "%="; 947 case BO_AddAssign: return "+="; 948 case BO_SubAssign: return "-="; 949 case BO_ShlAssign: return "<<="; 950 case BO_ShrAssign: return ">>="; 951 case BO_AndAssign: return "&="; 952 case BO_XorAssign: return "^="; 953 case BO_OrAssign: return "|="; 954 case BO_Comma: return ","; 955 } 956 957 return ""; 958} 959 960BinaryOperatorKind 961BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 962 switch (OO) { 963 default: assert(false && "Not an overloadable binary operator"); 964 case OO_Plus: return BO_Add; 965 case OO_Minus: return BO_Sub; 966 case OO_Star: return BO_Mul; 967 case OO_Slash: return BO_Div; 968 case OO_Percent: return BO_Rem; 969 case OO_Caret: return BO_Xor; 970 case OO_Amp: return BO_And; 971 case OO_Pipe: return BO_Or; 972 case OO_Equal: return BO_Assign; 973 case OO_Less: return BO_LT; 974 case OO_Greater: return BO_GT; 975 case OO_PlusEqual: return BO_AddAssign; 976 case OO_MinusEqual: return BO_SubAssign; 977 case OO_StarEqual: return BO_MulAssign; 978 case OO_SlashEqual: return BO_DivAssign; 979 case OO_PercentEqual: return BO_RemAssign; 980 case OO_CaretEqual: return BO_XorAssign; 981 case OO_AmpEqual: return BO_AndAssign; 982 case OO_PipeEqual: return BO_OrAssign; 983 case OO_LessLess: return BO_Shl; 984 case OO_GreaterGreater: return BO_Shr; 985 case OO_LessLessEqual: return BO_ShlAssign; 986 case OO_GreaterGreaterEqual: return BO_ShrAssign; 987 case OO_EqualEqual: return BO_EQ; 988 case OO_ExclaimEqual: return BO_NE; 989 case OO_LessEqual: return BO_LE; 990 case OO_GreaterEqual: return BO_GE; 991 case OO_AmpAmp: return BO_LAnd; 992 case OO_PipePipe: return BO_LOr; 993 case OO_Comma: return BO_Comma; 994 case OO_ArrowStar: return BO_PtrMemI; 995 } 996} 997 998OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 999 static const OverloadedOperatorKind OverOps[] = { 1000 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 1001 OO_Star, OO_Slash, OO_Percent, 1002 OO_Plus, OO_Minus, 1003 OO_LessLess, OO_GreaterGreater, 1004 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 1005 OO_EqualEqual, OO_ExclaimEqual, 1006 OO_Amp, 1007 OO_Caret, 1008 OO_Pipe, 1009 OO_AmpAmp, 1010 OO_PipePipe, 1011 OO_Equal, OO_StarEqual, 1012 OO_SlashEqual, OO_PercentEqual, 1013 OO_PlusEqual, OO_MinusEqual, 1014 OO_LessLessEqual, OO_GreaterGreaterEqual, 1015 OO_AmpEqual, OO_CaretEqual, 1016 OO_PipeEqual, 1017 OO_Comma 1018 }; 1019 return OverOps[Opc]; 1020} 1021 1022InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 1023 Expr **initExprs, unsigned numInits, 1024 SourceLocation rbraceloc) 1025 : Expr(InitListExprClass, QualType(), false, false), 1026 InitExprs(C, numInits), 1027 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 1028 UnionFieldInit(0), HadArrayRangeDesignator(false) 1029{ 1030 for (unsigned I = 0; I != numInits; ++I) { 1031 if (initExprs[I]->isTypeDependent()) 1032 ExprBits.TypeDependent = true; 1033 if (initExprs[I]->isValueDependent()) 1034 ExprBits.ValueDependent = true; 1035 } 1036 1037 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1038} 1039 1040void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1041 if (NumInits > InitExprs.size()) 1042 InitExprs.reserve(C, NumInits); 1043} 1044 1045void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1046 InitExprs.resize(C, NumInits, 0); 1047} 1048 1049Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1050 if (Init >= InitExprs.size()) { 1051 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1052 InitExprs.back() = expr; 1053 return 0; 1054 } 1055 1056 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1057 InitExprs[Init] = expr; 1058 return Result; 1059} 1060 1061SourceRange InitListExpr::getSourceRange() const { 1062 if (SyntacticForm) 1063 return SyntacticForm->getSourceRange(); 1064 SourceLocation Beg = LBraceLoc, End = RBraceLoc; 1065 if (Beg.isInvalid()) { 1066 // Find the first non-null initializer. 1067 for (InitExprsTy::const_iterator I = InitExprs.begin(), 1068 E = InitExprs.end(); 1069 I != E; ++I) { 1070 if (Stmt *S = *I) { 1071 Beg = S->getLocStart(); 1072 break; 1073 } 1074 } 1075 } 1076 if (End.isInvalid()) { 1077 // Find the first non-null initializer from the end. 1078 for (InitExprsTy::const_reverse_iterator I = InitExprs.rbegin(), 1079 E = InitExprs.rend(); 1080 I != E; ++I) { 1081 if (Stmt *S = *I) { 1082 End = S->getSourceRange().getEnd(); 1083 break; 1084 } 1085 } 1086 } 1087 return SourceRange(Beg, End); 1088} 1089 1090/// getFunctionType - Return the underlying function type for this block. 1091/// 1092const FunctionType *BlockExpr::getFunctionType() const { 1093 return getType()->getAs<BlockPointerType>()-> 1094 getPointeeType()->getAs<FunctionType>(); 1095} 1096 1097SourceLocation BlockExpr::getCaretLocation() const { 1098 return TheBlock->getCaretLocation(); 1099} 1100const Stmt *BlockExpr::getBody() const { 1101 return TheBlock->getBody(); 1102} 1103Stmt *BlockExpr::getBody() { 1104 return TheBlock->getBody(); 1105} 1106 1107 1108//===----------------------------------------------------------------------===// 1109// Generic Expression Routines 1110//===----------------------------------------------------------------------===// 1111 1112/// isUnusedResultAWarning - Return true if this immediate expression should 1113/// be warned about if the result is unused. If so, fill in Loc and Ranges 1114/// with location to warn on and the source range[s] to report with the 1115/// warning. 1116bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1117 SourceRange &R2, ASTContext &Ctx) const { 1118 // Don't warn if the expr is type dependent. The type could end up 1119 // instantiating to void. 1120 if (isTypeDependent()) 1121 return false; 1122 1123 switch (getStmtClass()) { 1124 default: 1125 if (getType()->isVoidType()) 1126 return false; 1127 Loc = getExprLoc(); 1128 R1 = getSourceRange(); 1129 return true; 1130 case ParenExprClass: 1131 return cast<ParenExpr>(this)->getSubExpr()-> 1132 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1133 case UnaryOperatorClass: { 1134 const UnaryOperator *UO = cast<UnaryOperator>(this); 1135 1136 switch (UO->getOpcode()) { 1137 default: break; 1138 case UO_PostInc: 1139 case UO_PostDec: 1140 case UO_PreInc: 1141 case UO_PreDec: // ++/-- 1142 return false; // Not a warning. 1143 case UO_Deref: 1144 // Dereferencing a volatile pointer is a side-effect. 1145 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1146 return false; 1147 break; 1148 case UO_Real: 1149 case UO_Imag: 1150 // accessing a piece of a volatile complex is a side-effect. 1151 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1152 .isVolatileQualified()) 1153 return false; 1154 break; 1155 case UO_Extension: 1156 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1157 } 1158 Loc = UO->getOperatorLoc(); 1159 R1 = UO->getSubExpr()->getSourceRange(); 1160 return true; 1161 } 1162 case BinaryOperatorClass: { 1163 const BinaryOperator *BO = cast<BinaryOperator>(this); 1164 switch (BO->getOpcode()) { 1165 default: 1166 break; 1167 // Consider the RHS of comma for side effects. LHS was checked by 1168 // Sema::CheckCommaOperands. 1169 case BO_Comma: 1170 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1171 // lvalue-ness) of an assignment written in a macro. 1172 if (IntegerLiteral *IE = 1173 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1174 if (IE->getValue() == 0) 1175 return false; 1176 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1177 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1178 case BO_LAnd: 1179 case BO_LOr: 1180 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1181 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1182 return false; 1183 break; 1184 } 1185 if (BO->isAssignmentOp()) 1186 return false; 1187 Loc = BO->getOperatorLoc(); 1188 R1 = BO->getLHS()->getSourceRange(); 1189 R2 = BO->getRHS()->getSourceRange(); 1190 return true; 1191 } 1192 case CompoundAssignOperatorClass: 1193 case VAArgExprClass: 1194 return false; 1195 1196 case ConditionalOperatorClass: { 1197 // The condition must be evaluated, but if either the LHS or RHS is a 1198 // warning, warn about them. 1199 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1200 if (Exp->getLHS() && 1201 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1202 return true; 1203 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1204 } 1205 1206 case MemberExprClass: 1207 // If the base pointer or element is to a volatile pointer/field, accessing 1208 // it is a side effect. 1209 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1210 return false; 1211 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1212 R1 = SourceRange(Loc, Loc); 1213 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1214 return true; 1215 1216 case ArraySubscriptExprClass: 1217 // If the base pointer or element is to a volatile pointer/field, accessing 1218 // it is a side effect. 1219 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1220 return false; 1221 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1222 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1223 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1224 return true; 1225 1226 case CallExprClass: 1227 case CXXOperatorCallExprClass: 1228 case CXXMemberCallExprClass: { 1229 // If this is a direct call, get the callee. 1230 const CallExpr *CE = cast<CallExpr>(this); 1231 if (const Decl *FD = CE->getCalleeDecl()) { 1232 // If the callee has attribute pure, const, or warn_unused_result, warn 1233 // about it. void foo() { strlen("bar"); } should warn. 1234 // 1235 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1236 // updated to match for QoI. 1237 if (FD->getAttr<WarnUnusedResultAttr>() || 1238 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1239 Loc = CE->getCallee()->getLocStart(); 1240 R1 = CE->getCallee()->getSourceRange(); 1241 1242 if (unsigned NumArgs = CE->getNumArgs()) 1243 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1244 CE->getArg(NumArgs-1)->getLocEnd()); 1245 return true; 1246 } 1247 } 1248 return false; 1249 } 1250 1251 case CXXTemporaryObjectExprClass: 1252 case CXXConstructExprClass: 1253 return false; 1254 1255 case ObjCMessageExprClass: { 1256 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1257 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1258 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1259 Loc = getExprLoc(); 1260 return true; 1261 } 1262 return false; 1263 } 1264 1265 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 1266#if 0 1267 const ObjCImplicitSetterGetterRefExpr *Ref = 1268 cast<ObjCImplicitSetterGetterRefExpr>(this); 1269 // FIXME: We really want the location of the '.' here. 1270 Loc = Ref->getLocation(); 1271 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 1272 if (Ref->getBase()) 1273 R2 = Ref->getBase()->getSourceRange(); 1274#else 1275 Loc = getExprLoc(); 1276 R1 = getSourceRange(); 1277#endif 1278 return true; 1279 } 1280 case StmtExprClass: { 1281 // Statement exprs don't logically have side effects themselves, but are 1282 // sometimes used in macros in ways that give them a type that is unused. 1283 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1284 // however, if the result of the stmt expr is dead, we don't want to emit a 1285 // warning. 1286 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1287 if (!CS->body_empty()) { 1288 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1289 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1290 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1291 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1292 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1293 } 1294 1295 if (getType()->isVoidType()) 1296 return false; 1297 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1298 R1 = getSourceRange(); 1299 return true; 1300 } 1301 case CStyleCastExprClass: 1302 // If this is an explicit cast to void, allow it. People do this when they 1303 // think they know what they're doing :). 1304 if (getType()->isVoidType()) 1305 return false; 1306 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1307 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1308 return true; 1309 case CXXFunctionalCastExprClass: { 1310 if (getType()->isVoidType()) 1311 return false; 1312 const CastExpr *CE = cast<CastExpr>(this); 1313 1314 // If this is a cast to void or a constructor conversion, check the operand. 1315 // Otherwise, the result of the cast is unused. 1316 if (CE->getCastKind() == CK_ToVoid || 1317 CE->getCastKind() == CK_ConstructorConversion) 1318 return (cast<CastExpr>(this)->getSubExpr() 1319 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1320 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1321 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1322 return true; 1323 } 1324 1325 case ImplicitCastExprClass: 1326 // Check the operand, since implicit casts are inserted by Sema 1327 return (cast<ImplicitCastExpr>(this) 1328 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1329 1330 case CXXDefaultArgExprClass: 1331 return (cast<CXXDefaultArgExpr>(this) 1332 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1333 1334 case CXXNewExprClass: 1335 // FIXME: In theory, there might be new expressions that don't have side 1336 // effects (e.g. a placement new with an uninitialized POD). 1337 case CXXDeleteExprClass: 1338 return false; 1339 case CXXBindTemporaryExprClass: 1340 return (cast<CXXBindTemporaryExpr>(this) 1341 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1342 case CXXExprWithTemporariesClass: 1343 return (cast<CXXExprWithTemporaries>(this) 1344 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1345 } 1346} 1347 1348/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1349/// returns true, if it is; false otherwise. 1350bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1351 switch (getStmtClass()) { 1352 default: 1353 return false; 1354 case ObjCIvarRefExprClass: 1355 return true; 1356 case Expr::UnaryOperatorClass: 1357 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1358 case ParenExprClass: 1359 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1360 case ImplicitCastExprClass: 1361 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1362 case CStyleCastExprClass: 1363 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1364 case DeclRefExprClass: { 1365 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1366 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1367 if (VD->hasGlobalStorage()) 1368 return true; 1369 QualType T = VD->getType(); 1370 // dereferencing to a pointer is always a gc'able candidate, 1371 // unless it is __weak. 1372 return T->isPointerType() && 1373 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1374 } 1375 return false; 1376 } 1377 case MemberExprClass: { 1378 const MemberExpr *M = cast<MemberExpr>(this); 1379 return M->getBase()->isOBJCGCCandidate(Ctx); 1380 } 1381 case ArraySubscriptExprClass: 1382 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1383 } 1384} 1385 1386bool Expr::isBoundMemberFunction(ASTContext &Ctx) const { 1387 if (isTypeDependent()) 1388 return false; 1389 return isLvalue(Ctx) == Expr::LV_MemberFunction; 1390} 1391 1392static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1393 Expr::CanThrowResult CT2) { 1394 // CanThrowResult constants are ordered so that the maximum is the correct 1395 // merge result. 1396 return CT1 > CT2 ? CT1 : CT2; 1397} 1398 1399static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1400 Expr *E = const_cast<Expr*>(CE); 1401 Expr::CanThrowResult R = Expr::CT_Cannot; 1402 for (Expr::child_iterator I = E->child_begin(), IE = E->child_end(); 1403 I != IE && R != Expr::CT_Can; ++I) { 1404 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1405 } 1406 return R; 1407} 1408 1409static Expr::CanThrowResult CanCalleeThrow(const Decl *D, 1410 bool NullThrows = true) { 1411 if (!D) 1412 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1413 1414 // See if we can get a function type from the decl somehow. 1415 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1416 if (!VD) // If we have no clue what we're calling, assume the worst. 1417 return Expr::CT_Can; 1418 1419 // As an extension, we assume that __attribute__((nothrow)) functions don't 1420 // throw. 1421 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1422 return Expr::CT_Cannot; 1423 1424 QualType T = VD->getType(); 1425 const FunctionProtoType *FT; 1426 if ((FT = T->getAs<FunctionProtoType>())) { 1427 } else if (const PointerType *PT = T->getAs<PointerType>()) 1428 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1429 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1430 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1431 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1432 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1433 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1434 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1435 1436 if (!FT) 1437 return Expr::CT_Can; 1438 1439 return FT->hasEmptyExceptionSpec() ? Expr::CT_Cannot : Expr::CT_Can; 1440} 1441 1442static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1443 if (DC->isTypeDependent()) 1444 return Expr::CT_Dependent; 1445 1446 if (!DC->getTypeAsWritten()->isReferenceType()) 1447 return Expr::CT_Cannot; 1448 1449 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1450} 1451 1452static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1453 const CXXTypeidExpr *DC) { 1454 if (DC->isTypeOperand()) 1455 return Expr::CT_Cannot; 1456 1457 Expr *Op = DC->getExprOperand(); 1458 if (Op->isTypeDependent()) 1459 return Expr::CT_Dependent; 1460 1461 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1462 if (!RT) 1463 return Expr::CT_Cannot; 1464 1465 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1466 return Expr::CT_Cannot; 1467 1468 if (Op->Classify(C).isPRValue()) 1469 return Expr::CT_Cannot; 1470 1471 return Expr::CT_Can; 1472} 1473 1474Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 1475 // C++ [expr.unary.noexcept]p3: 1476 // [Can throw] if in a potentially-evaluated context the expression would 1477 // contain: 1478 switch (getStmtClass()) { 1479 case CXXThrowExprClass: 1480 // - a potentially evaluated throw-expression 1481 return CT_Can; 1482 1483 case CXXDynamicCastExprClass: { 1484 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 1485 // where T is a reference type, that requires a run-time check 1486 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 1487 if (CT == CT_Can) 1488 return CT; 1489 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1490 } 1491 1492 case CXXTypeidExprClass: 1493 // - a potentially evaluated typeid expression applied to a glvalue 1494 // expression whose type is a polymorphic class type 1495 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 1496 1497 // - a potentially evaluated call to a function, member function, function 1498 // pointer, or member function pointer that does not have a non-throwing 1499 // exception-specification 1500 case CallExprClass: 1501 case CXXOperatorCallExprClass: 1502 case CXXMemberCallExprClass: { 1503 CanThrowResult CT = CanCalleeThrow(cast<CallExpr>(this)->getCalleeDecl()); 1504 if (CT == CT_Can) 1505 return CT; 1506 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1507 } 1508 1509 case CXXConstructExprClass: 1510 case CXXTemporaryObjectExprClass: { 1511 CanThrowResult CT = CanCalleeThrow( 1512 cast<CXXConstructExpr>(this)->getConstructor()); 1513 if (CT == CT_Can) 1514 return CT; 1515 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1516 } 1517 1518 case CXXNewExprClass: { 1519 CanThrowResult CT = MergeCanThrow( 1520 CanCalleeThrow(cast<CXXNewExpr>(this)->getOperatorNew()), 1521 CanCalleeThrow(cast<CXXNewExpr>(this)->getConstructor(), 1522 /*NullThrows*/false)); 1523 if (CT == CT_Can) 1524 return CT; 1525 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1526 } 1527 1528 case CXXDeleteExprClass: { 1529 CanThrowResult CT = CanCalleeThrow( 1530 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 1531 if (CT == CT_Can) 1532 return CT; 1533 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument(); 1534 // Unwrap exactly one implicit cast, which converts all pointers to void*. 1535 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) 1536 Arg = Cast->getSubExpr(); 1537 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) { 1538 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) { 1539 CanThrowResult CT2 = CanCalleeThrow( 1540 cast<CXXRecordDecl>(RT->getDecl())->getDestructor()); 1541 if (CT2 == CT_Can) 1542 return CT2; 1543 CT = MergeCanThrow(CT, CT2); 1544 } 1545 } 1546 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1547 } 1548 1549 case CXXBindTemporaryExprClass: { 1550 // The bound temporary has to be destroyed again, which might throw. 1551 CanThrowResult CT = CanCalleeThrow( 1552 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 1553 if (CT == CT_Can) 1554 return CT; 1555 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1556 } 1557 1558 // ObjC message sends are like function calls, but never have exception 1559 // specs. 1560 case ObjCMessageExprClass: 1561 case ObjCPropertyRefExprClass: 1562 case ObjCImplicitSetterGetterRefExprClass: 1563 return CT_Can; 1564 1565 // Many other things have subexpressions, so we have to test those. 1566 // Some are simple: 1567 case ParenExprClass: 1568 case MemberExprClass: 1569 case CXXReinterpretCastExprClass: 1570 case CXXConstCastExprClass: 1571 case ConditionalOperatorClass: 1572 case CompoundLiteralExprClass: 1573 case ExtVectorElementExprClass: 1574 case InitListExprClass: 1575 case DesignatedInitExprClass: 1576 case ParenListExprClass: 1577 case VAArgExprClass: 1578 case CXXDefaultArgExprClass: 1579 case CXXExprWithTemporariesClass: 1580 case ObjCIvarRefExprClass: 1581 case ObjCIsaExprClass: 1582 case ShuffleVectorExprClass: 1583 return CanSubExprsThrow(C, this); 1584 1585 // Some might be dependent for other reasons. 1586 case UnaryOperatorClass: 1587 case ArraySubscriptExprClass: 1588 case ImplicitCastExprClass: 1589 case CStyleCastExprClass: 1590 case CXXStaticCastExprClass: 1591 case CXXFunctionalCastExprClass: 1592 case BinaryOperatorClass: 1593 case CompoundAssignOperatorClass: { 1594 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 1595 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1596 } 1597 1598 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 1599 case StmtExprClass: 1600 return CT_Can; 1601 1602 case ChooseExprClass: 1603 if (isTypeDependent() || isValueDependent()) 1604 return CT_Dependent; 1605 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 1606 1607 // Some expressions are always dependent. 1608 case DependentScopeDeclRefExprClass: 1609 case CXXUnresolvedConstructExprClass: 1610 case CXXDependentScopeMemberExprClass: 1611 return CT_Dependent; 1612 1613 default: 1614 // All other expressions don't have subexpressions, or else they are 1615 // unevaluated. 1616 return CT_Cannot; 1617 } 1618} 1619 1620Expr* Expr::IgnoreParens() { 1621 Expr* E = this; 1622 while (true) { 1623 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1624 E = P->getSubExpr(); 1625 continue; 1626 } 1627 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1628 if (P->getOpcode() == UO_Extension) { 1629 E = P->getSubExpr(); 1630 continue; 1631 } 1632 } 1633 return E; 1634 } 1635} 1636 1637/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1638/// or CastExprs or ImplicitCastExprs, returning their operand. 1639Expr *Expr::IgnoreParenCasts() { 1640 Expr *E = this; 1641 while (true) { 1642 if (ParenExpr* P = dyn_cast<ParenExpr>(E)) { 1643 E = P->getSubExpr(); 1644 continue; 1645 } 1646 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1647 E = P->getSubExpr(); 1648 continue; 1649 } 1650 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1651 if (P->getOpcode() == UO_Extension) { 1652 E = P->getSubExpr(); 1653 continue; 1654 } 1655 } 1656 return E; 1657 } 1658} 1659 1660Expr *Expr::IgnoreParenImpCasts() { 1661 Expr *E = this; 1662 while (true) { 1663 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1664 E = P->getSubExpr(); 1665 continue; 1666 } 1667 if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) { 1668 E = P->getSubExpr(); 1669 continue; 1670 } 1671 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1672 if (P->getOpcode() == UO_Extension) { 1673 E = P->getSubExpr(); 1674 continue; 1675 } 1676 } 1677 return E; 1678 } 1679} 1680 1681/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1682/// value (including ptr->int casts of the same size). Strip off any 1683/// ParenExpr or CastExprs, returning their operand. 1684Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1685 Expr *E = this; 1686 while (true) { 1687 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1688 E = P->getSubExpr(); 1689 continue; 1690 } 1691 1692 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1693 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1694 // ptr<->int casts of the same width. We also ignore all identity casts. 1695 Expr *SE = P->getSubExpr(); 1696 1697 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1698 E = SE; 1699 continue; 1700 } 1701 1702 if ((E->getType()->isPointerType() || 1703 E->getType()->isIntegralType(Ctx)) && 1704 (SE->getType()->isPointerType() || 1705 SE->getType()->isIntegralType(Ctx)) && 1706 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1707 E = SE; 1708 continue; 1709 } 1710 } 1711 1712 if (UnaryOperator* P = dyn_cast<UnaryOperator>(E)) { 1713 if (P->getOpcode() == UO_Extension) { 1714 E = P->getSubExpr(); 1715 continue; 1716 } 1717 } 1718 1719 return E; 1720 } 1721} 1722 1723bool Expr::isDefaultArgument() const { 1724 const Expr *E = this; 1725 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1726 E = ICE->getSubExprAsWritten(); 1727 1728 return isa<CXXDefaultArgExpr>(E); 1729} 1730 1731/// \brief Skip over any no-op casts and any temporary-binding 1732/// expressions. 1733static const Expr *skipTemporaryBindingsAndNoOpCasts(const Expr *E) { 1734 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1735 if (ICE->getCastKind() == CK_NoOp) 1736 E = ICE->getSubExpr(); 1737 else 1738 break; 1739 } 1740 1741 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1742 E = BE->getSubExpr(); 1743 1744 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1745 if (ICE->getCastKind() == CK_NoOp) 1746 E = ICE->getSubExpr(); 1747 else 1748 break; 1749 } 1750 1751 return E; 1752} 1753 1754/// isTemporaryObject - Determines if this expression produces a 1755/// temporary of the given class type. 1756bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 1757 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 1758 return false; 1759 1760 const Expr *E = skipTemporaryBindingsAndNoOpCasts(this); 1761 1762 // Temporaries are by definition pr-values of class type. 1763 if (!E->Classify(C).isPRValue()) { 1764 // In this context, property reference is a message call and is pr-value. 1765 if (!isa<ObjCPropertyRefExpr>(E) && 1766 !isa<ObjCImplicitSetterGetterRefExpr>(E)) 1767 return false; 1768 } 1769 1770 // Black-list a few cases which yield pr-values of class type that don't 1771 // refer to temporaries of that type: 1772 1773 // - implicit derived-to-base conversions 1774 if (isa<ImplicitCastExpr>(E)) { 1775 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 1776 case CK_DerivedToBase: 1777 case CK_UncheckedDerivedToBase: 1778 return false; 1779 default: 1780 break; 1781 } 1782 } 1783 1784 // - member expressions (all) 1785 if (isa<MemberExpr>(E)) 1786 return false; 1787 1788 return true; 1789} 1790 1791/// hasAnyTypeDependentArguments - Determines if any of the expressions 1792/// in Exprs is type-dependent. 1793bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1794 for (unsigned I = 0; I < NumExprs; ++I) 1795 if (Exprs[I]->isTypeDependent()) 1796 return true; 1797 1798 return false; 1799} 1800 1801/// hasAnyValueDependentArguments - Determines if any of the expressions 1802/// in Exprs is value-dependent. 1803bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1804 for (unsigned I = 0; I < NumExprs; ++I) 1805 if (Exprs[I]->isValueDependent()) 1806 return true; 1807 1808 return false; 1809} 1810 1811bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 1812 // This function is attempting whether an expression is an initializer 1813 // which can be evaluated at compile-time. isEvaluatable handles most 1814 // of the cases, but it can't deal with some initializer-specific 1815 // expressions, and it can't deal with aggregates; we deal with those here, 1816 // and fall back to isEvaluatable for the other cases. 1817 1818 // If we ever capture reference-binding directly in the AST, we can 1819 // kill the second parameter. 1820 1821 if (IsForRef) { 1822 EvalResult Result; 1823 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 1824 } 1825 1826 switch (getStmtClass()) { 1827 default: break; 1828 case StringLiteralClass: 1829 case ObjCStringLiteralClass: 1830 case ObjCEncodeExprClass: 1831 return true; 1832 case CXXTemporaryObjectExprClass: 1833 case CXXConstructExprClass: { 1834 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 1835 1836 // Only if it's 1837 // 1) an application of the trivial default constructor or 1838 if (!CE->getConstructor()->isTrivial()) return false; 1839 if (!CE->getNumArgs()) return true; 1840 1841 // 2) an elidable trivial copy construction of an operand which is 1842 // itself a constant initializer. Note that we consider the 1843 // operand on its own, *not* as a reference binding. 1844 return CE->isElidable() && 1845 CE->getArg(0)->isConstantInitializer(Ctx, false); 1846 } 1847 case CompoundLiteralExprClass: { 1848 // This handles gcc's extension that allows global initializers like 1849 // "struct x {int x;} x = (struct x) {};". 1850 // FIXME: This accepts other cases it shouldn't! 1851 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1852 return Exp->isConstantInitializer(Ctx, false); 1853 } 1854 case InitListExprClass: { 1855 // FIXME: This doesn't deal with fields with reference types correctly. 1856 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1857 // to bitfields. 1858 const InitListExpr *Exp = cast<InitListExpr>(this); 1859 unsigned numInits = Exp->getNumInits(); 1860 for (unsigned i = 0; i < numInits; i++) { 1861 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 1862 return false; 1863 } 1864 return true; 1865 } 1866 case ImplicitValueInitExprClass: 1867 return true; 1868 case ParenExprClass: 1869 return cast<ParenExpr>(this)->getSubExpr() 1870 ->isConstantInitializer(Ctx, IsForRef); 1871 case ChooseExprClass: 1872 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 1873 ->isConstantInitializer(Ctx, IsForRef); 1874 case UnaryOperatorClass: { 1875 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1876 if (Exp->getOpcode() == UO_Extension) 1877 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 1878 break; 1879 } 1880 case BinaryOperatorClass: { 1881 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1882 // but this handles the common case. 1883 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1884 if (Exp->getOpcode() == BO_Sub && 1885 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1886 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1887 return true; 1888 break; 1889 } 1890 case CXXFunctionalCastExprClass: 1891 case CXXStaticCastExprClass: 1892 case ImplicitCastExprClass: 1893 case CStyleCastExprClass: 1894 // Handle casts with a destination that's a struct or union; this 1895 // deals with both the gcc no-op struct cast extension and the 1896 // cast-to-union extension. 1897 if (getType()->isRecordType()) 1898 return cast<CastExpr>(this)->getSubExpr() 1899 ->isConstantInitializer(Ctx, false); 1900 1901 // Integer->integer casts can be handled here, which is important for 1902 // things like (int)(&&x-&&y). Scary but true. 1903 if (getType()->isIntegerType() && 1904 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1905 return cast<CastExpr>(this)->getSubExpr() 1906 ->isConstantInitializer(Ctx, false); 1907 1908 break; 1909 } 1910 return isEvaluatable(Ctx); 1911} 1912 1913/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1914/// integer constant expression with the value zero, or if this is one that is 1915/// cast to void*. 1916bool Expr::isNullPointerConstant(ASTContext &Ctx, 1917 NullPointerConstantValueDependence NPC) const { 1918 if (isValueDependent()) { 1919 switch (NPC) { 1920 case NPC_NeverValueDependent: 1921 assert(false && "Unexpected value dependent expression!"); 1922 // If the unthinkable happens, fall through to the safest alternative. 1923 1924 case NPC_ValueDependentIsNull: 1925 return isTypeDependent() || getType()->isIntegralType(Ctx); 1926 1927 case NPC_ValueDependentIsNotNull: 1928 return false; 1929 } 1930 } 1931 1932 // Strip off a cast to void*, if it exists. Except in C++. 1933 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1934 if (!Ctx.getLangOptions().CPlusPlus) { 1935 // Check that it is a cast to void*. 1936 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1937 QualType Pointee = PT->getPointeeType(); 1938 if (!Pointee.hasQualifiers() && 1939 Pointee->isVoidType() && // to void* 1940 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1941 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1942 } 1943 } 1944 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1945 // Ignore the ImplicitCastExpr type entirely. 1946 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1947 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1948 // Accept ((void*)0) as a null pointer constant, as many other 1949 // implementations do. 1950 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1951 } else if (const CXXDefaultArgExpr *DefaultArg 1952 = dyn_cast<CXXDefaultArgExpr>(this)) { 1953 // See through default argument expressions 1954 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1955 } else if (isa<GNUNullExpr>(this)) { 1956 // The GNU __null extension is always a null pointer constant. 1957 return true; 1958 } 1959 1960 // C++0x nullptr_t is always a null pointer constant. 1961 if (getType()->isNullPtrType()) 1962 return true; 1963 1964 if (const RecordType *UT = getType()->getAsUnionType()) 1965 if (UT && UT->getDecl()->hasAttr<TransparentUnionAttr>()) 1966 if (const CompoundLiteralExpr *CLE = dyn_cast<CompoundLiteralExpr>(this)){ 1967 const Expr *InitExpr = CLE->getInitializer(); 1968 if (const InitListExpr *ILE = dyn_cast<InitListExpr>(InitExpr)) 1969 return ILE->getInit(0)->isNullPointerConstant(Ctx, NPC); 1970 } 1971 // This expression must be an integer type. 1972 if (!getType()->isIntegerType() || 1973 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1974 return false; 1975 1976 // If we have an integer constant expression, we need to *evaluate* it and 1977 // test for the value 0. 1978 llvm::APSInt Result; 1979 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1980} 1981 1982FieldDecl *Expr::getBitField() { 1983 Expr *E = this->IgnoreParens(); 1984 1985 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1986 if (ICE->getValueKind() != VK_RValue && 1987 ICE->getCastKind() == CK_NoOp) 1988 E = ICE->getSubExpr()->IgnoreParens(); 1989 else 1990 break; 1991 } 1992 1993 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1994 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1995 if (Field->isBitField()) 1996 return Field; 1997 1998 if (DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E)) 1999 if (FieldDecl *Field = dyn_cast<FieldDecl>(DeclRef->getDecl())) 2000 if (Field->isBitField()) 2001 return Field; 2002 2003 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 2004 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 2005 return BinOp->getLHS()->getBitField(); 2006 2007 return 0; 2008} 2009 2010bool Expr::refersToVectorElement() const { 2011 const Expr *E = this->IgnoreParens(); 2012 2013 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 2014 if (ICE->getValueKind() != VK_RValue && 2015 ICE->getCastKind() == CK_NoOp) 2016 E = ICE->getSubExpr()->IgnoreParens(); 2017 else 2018 break; 2019 } 2020 2021 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 2022 return ASE->getBase()->getType()->isVectorType(); 2023 2024 if (isa<ExtVectorElementExpr>(E)) 2025 return true; 2026 2027 return false; 2028} 2029 2030/// isArrow - Return true if the base expression is a pointer to vector, 2031/// return false if the base expression is a vector. 2032bool ExtVectorElementExpr::isArrow() const { 2033 return getBase()->getType()->isPointerType(); 2034} 2035 2036unsigned ExtVectorElementExpr::getNumElements() const { 2037 if (const VectorType *VT = getType()->getAs<VectorType>()) 2038 return VT->getNumElements(); 2039 return 1; 2040} 2041 2042/// containsDuplicateElements - Return true if any element access is repeated. 2043bool ExtVectorElementExpr::containsDuplicateElements() const { 2044 // FIXME: Refactor this code to an accessor on the AST node which returns the 2045 // "type" of component access, and share with code below and in Sema. 2046 llvm::StringRef Comp = Accessor->getName(); 2047 2048 // Halving swizzles do not contain duplicate elements. 2049 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 2050 return false; 2051 2052 // Advance past s-char prefix on hex swizzles. 2053 if (Comp[0] == 's' || Comp[0] == 'S') 2054 Comp = Comp.substr(1); 2055 2056 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 2057 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 2058 return true; 2059 2060 return false; 2061} 2062 2063/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 2064void ExtVectorElementExpr::getEncodedElementAccess( 2065 llvm::SmallVectorImpl<unsigned> &Elts) const { 2066 llvm::StringRef Comp = Accessor->getName(); 2067 if (Comp[0] == 's' || Comp[0] == 'S') 2068 Comp = Comp.substr(1); 2069 2070 bool isHi = Comp == "hi"; 2071 bool isLo = Comp == "lo"; 2072 bool isEven = Comp == "even"; 2073 bool isOdd = Comp == "odd"; 2074 2075 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 2076 uint64_t Index; 2077 2078 if (isHi) 2079 Index = e + i; 2080 else if (isLo) 2081 Index = i; 2082 else if (isEven) 2083 Index = 2 * i; 2084 else if (isOdd) 2085 Index = 2 * i + 1; 2086 else 2087 Index = ExtVectorType::getAccessorIdx(Comp[i]); 2088 2089 Elts.push_back(Index); 2090 } 2091} 2092 2093ObjCMessageExpr::ObjCMessageExpr(QualType T, 2094 SourceLocation LBracLoc, 2095 SourceLocation SuperLoc, 2096 bool IsInstanceSuper, 2097 QualType SuperType, 2098 Selector Sel, 2099 ObjCMethodDecl *Method, 2100 Expr **Args, unsigned NumArgs, 2101 SourceLocation RBracLoc) 2102 : Expr(ObjCMessageExprClass, T, /*TypeDependent=*/false, 2103 /*ValueDependent=*/false), 2104 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 2105 HasMethod(Method != 0), SuperLoc(SuperLoc), 2106 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2107 : Sel.getAsOpaquePtr())), 2108 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2109{ 2110 setReceiverPointer(SuperType.getAsOpaquePtr()); 2111 if (NumArgs) 2112 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2113} 2114 2115ObjCMessageExpr::ObjCMessageExpr(QualType T, 2116 SourceLocation LBracLoc, 2117 TypeSourceInfo *Receiver, 2118 Selector Sel, 2119 ObjCMethodDecl *Method, 2120 Expr **Args, unsigned NumArgs, 2121 SourceLocation RBracLoc) 2122 : Expr(ObjCMessageExprClass, T, T->isDependentType(), 2123 (T->isDependentType() || 2124 hasAnyValueDependentArguments(Args, NumArgs))), 2125 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 2126 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2127 : Sel.getAsOpaquePtr())), 2128 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2129{ 2130 setReceiverPointer(Receiver); 2131 if (NumArgs) 2132 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2133} 2134 2135ObjCMessageExpr::ObjCMessageExpr(QualType T, 2136 SourceLocation LBracLoc, 2137 Expr *Receiver, 2138 Selector Sel, 2139 ObjCMethodDecl *Method, 2140 Expr **Args, unsigned NumArgs, 2141 SourceLocation RBracLoc) 2142 : Expr(ObjCMessageExprClass, T, Receiver->isTypeDependent(), 2143 (Receiver->isTypeDependent() || 2144 hasAnyValueDependentArguments(Args, NumArgs))), 2145 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2146 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2147 : Sel.getAsOpaquePtr())), 2148 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2149{ 2150 setReceiverPointer(Receiver); 2151 if (NumArgs) 2152 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2153} 2154 2155ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2156 SourceLocation LBracLoc, 2157 SourceLocation SuperLoc, 2158 bool IsInstanceSuper, 2159 QualType SuperType, 2160 Selector Sel, 2161 ObjCMethodDecl *Method, 2162 Expr **Args, unsigned NumArgs, 2163 SourceLocation RBracLoc) { 2164 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2165 NumArgs * sizeof(Expr *); 2166 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2167 return new (Mem) ObjCMessageExpr(T, LBracLoc, SuperLoc, IsInstanceSuper, 2168 SuperType, Sel, Method, Args, NumArgs, 2169 RBracLoc); 2170} 2171 2172ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2173 SourceLocation LBracLoc, 2174 TypeSourceInfo *Receiver, 2175 Selector Sel, 2176 ObjCMethodDecl *Method, 2177 Expr **Args, unsigned NumArgs, 2178 SourceLocation RBracLoc) { 2179 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2180 NumArgs * sizeof(Expr *); 2181 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2182 return new (Mem) ObjCMessageExpr(T, LBracLoc, Receiver, Sel, Method, Args, 2183 NumArgs, RBracLoc); 2184} 2185 2186ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2187 SourceLocation LBracLoc, 2188 Expr *Receiver, 2189 Selector Sel, 2190 ObjCMethodDecl *Method, 2191 Expr **Args, unsigned NumArgs, 2192 SourceLocation RBracLoc) { 2193 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2194 NumArgs * sizeof(Expr *); 2195 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2196 return new (Mem) ObjCMessageExpr(T, LBracLoc, Receiver, Sel, Method, Args, 2197 NumArgs, RBracLoc); 2198} 2199 2200ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2201 unsigned NumArgs) { 2202 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2203 NumArgs * sizeof(Expr *); 2204 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2205 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2206} 2207 2208Selector ObjCMessageExpr::getSelector() const { 2209 if (HasMethod) 2210 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2211 ->getSelector(); 2212 return Selector(SelectorOrMethod); 2213} 2214 2215ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2216 switch (getReceiverKind()) { 2217 case Instance: 2218 if (const ObjCObjectPointerType *Ptr 2219 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2220 return Ptr->getInterfaceDecl(); 2221 break; 2222 2223 case Class: 2224 if (const ObjCObjectType *Ty 2225 = getClassReceiver()->getAs<ObjCObjectType>()) 2226 return Ty->getInterface(); 2227 break; 2228 2229 case SuperInstance: 2230 if (const ObjCObjectPointerType *Ptr 2231 = getSuperType()->getAs<ObjCObjectPointerType>()) 2232 return Ptr->getInterfaceDecl(); 2233 break; 2234 2235 case SuperClass: 2236 if (const ObjCObjectPointerType *Iface 2237 = getSuperType()->getAs<ObjCObjectPointerType>()) 2238 return Iface->getInterfaceDecl(); 2239 break; 2240 } 2241 2242 return 0; 2243} 2244 2245bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2246 return getCond()->EvaluateAsInt(C) != 0; 2247} 2248 2249void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2250 unsigned NumExprs) { 2251 if (SubExprs) C.Deallocate(SubExprs); 2252 2253 SubExprs = new (C) Stmt* [NumExprs]; 2254 this->NumExprs = NumExprs; 2255 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2256} 2257 2258//===----------------------------------------------------------------------===// 2259// DesignatedInitExpr 2260//===----------------------------------------------------------------------===// 2261 2262IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2263 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2264 if (Field.NameOrField & 0x01) 2265 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2266 else 2267 return getField()->getIdentifier(); 2268} 2269 2270DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2271 unsigned NumDesignators, 2272 const Designator *Designators, 2273 SourceLocation EqualOrColonLoc, 2274 bool GNUSyntax, 2275 Expr **IndexExprs, 2276 unsigned NumIndexExprs, 2277 Expr *Init) 2278 : Expr(DesignatedInitExprClass, Ty, 2279 Init->isTypeDependent(), Init->isValueDependent()), 2280 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2281 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2282 this->Designators = new (C) Designator[NumDesignators]; 2283 2284 // Record the initializer itself. 2285 child_iterator Child = child_begin(); 2286 *Child++ = Init; 2287 2288 // Copy the designators and their subexpressions, computing 2289 // value-dependence along the way. 2290 unsigned IndexIdx = 0; 2291 for (unsigned I = 0; I != NumDesignators; ++I) { 2292 this->Designators[I] = Designators[I]; 2293 2294 if (this->Designators[I].isArrayDesignator()) { 2295 // Compute type- and value-dependence. 2296 Expr *Index = IndexExprs[IndexIdx]; 2297 ExprBits.ValueDependent = ExprBits.ValueDependent || 2298 Index->isTypeDependent() || Index->isValueDependent(); 2299 2300 // Copy the index expressions into permanent storage. 2301 *Child++ = IndexExprs[IndexIdx++]; 2302 } else if (this->Designators[I].isArrayRangeDesignator()) { 2303 // Compute type- and value-dependence. 2304 Expr *Start = IndexExprs[IndexIdx]; 2305 Expr *End = IndexExprs[IndexIdx + 1]; 2306 ExprBits.ValueDependent = ExprBits.ValueDependent || 2307 Start->isTypeDependent() || Start->isValueDependent() || 2308 End->isTypeDependent() || End->isValueDependent(); 2309 2310 // Copy the start/end expressions into permanent storage. 2311 *Child++ = IndexExprs[IndexIdx++]; 2312 *Child++ = IndexExprs[IndexIdx++]; 2313 } 2314 } 2315 2316 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2317} 2318 2319DesignatedInitExpr * 2320DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2321 unsigned NumDesignators, 2322 Expr **IndexExprs, unsigned NumIndexExprs, 2323 SourceLocation ColonOrEqualLoc, 2324 bool UsesColonSyntax, Expr *Init) { 2325 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2326 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2327 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2328 ColonOrEqualLoc, UsesColonSyntax, 2329 IndexExprs, NumIndexExprs, Init); 2330} 2331 2332DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2333 unsigned NumIndexExprs) { 2334 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2335 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2336 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2337} 2338 2339void DesignatedInitExpr::setDesignators(ASTContext &C, 2340 const Designator *Desigs, 2341 unsigned NumDesigs) { 2342 Designators = new (C) Designator[NumDesigs]; 2343 NumDesignators = NumDesigs; 2344 for (unsigned I = 0; I != NumDesigs; ++I) 2345 Designators[I] = Desigs[I]; 2346} 2347 2348SourceRange DesignatedInitExpr::getSourceRange() const { 2349 SourceLocation StartLoc; 2350 Designator &First = 2351 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2352 if (First.isFieldDesignator()) { 2353 if (GNUSyntax) 2354 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2355 else 2356 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2357 } else 2358 StartLoc = 2359 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2360 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2361} 2362 2363Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2364 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2365 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2366 Ptr += sizeof(DesignatedInitExpr); 2367 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2368 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2369} 2370 2371Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2372 assert(D.Kind == Designator::ArrayRangeDesignator && 2373 "Requires array range designator"); 2374 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2375 Ptr += sizeof(DesignatedInitExpr); 2376 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2377 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2378} 2379 2380Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2381 assert(D.Kind == Designator::ArrayRangeDesignator && 2382 "Requires array range designator"); 2383 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2384 Ptr += sizeof(DesignatedInitExpr); 2385 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2386 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2387} 2388 2389/// \brief Replaces the designator at index @p Idx with the series 2390/// of designators in [First, Last). 2391void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2392 const Designator *First, 2393 const Designator *Last) { 2394 unsigned NumNewDesignators = Last - First; 2395 if (NumNewDesignators == 0) { 2396 std::copy_backward(Designators + Idx + 1, 2397 Designators + NumDesignators, 2398 Designators + Idx); 2399 --NumNewDesignators; 2400 return; 2401 } else if (NumNewDesignators == 1) { 2402 Designators[Idx] = *First; 2403 return; 2404 } 2405 2406 Designator *NewDesignators 2407 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2408 std::copy(Designators, Designators + Idx, NewDesignators); 2409 std::copy(First, Last, NewDesignators + Idx); 2410 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2411 NewDesignators + Idx + NumNewDesignators); 2412 Designators = NewDesignators; 2413 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2414} 2415 2416ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2417 Expr **exprs, unsigned nexprs, 2418 SourceLocation rparenloc) 2419: Expr(ParenListExprClass, QualType(), 2420 hasAnyTypeDependentArguments(exprs, nexprs), 2421 hasAnyValueDependentArguments(exprs, nexprs)), 2422 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2423 2424 Exprs = new (C) Stmt*[nexprs]; 2425 for (unsigned i = 0; i != nexprs; ++i) 2426 Exprs[i] = exprs[i]; 2427} 2428 2429//===----------------------------------------------------------------------===// 2430// ExprIterator. 2431//===----------------------------------------------------------------------===// 2432 2433Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2434Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2435Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2436const Expr* ConstExprIterator::operator[](size_t idx) const { 2437 return cast<Expr>(I[idx]); 2438} 2439const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2440const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2441 2442//===----------------------------------------------------------------------===// 2443// Child Iterators for iterating over subexpressions/substatements 2444//===----------------------------------------------------------------------===// 2445 2446// DeclRefExpr 2447Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2448Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2449 2450// ObjCIvarRefExpr 2451Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2452Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2453 2454// ObjCPropertyRefExpr 2455Stmt::child_iterator ObjCPropertyRefExpr::child_begin() 2456{ 2457 if (BaseExprOrSuperType.is<Stmt*>()) { 2458 // Hack alert! 2459 return reinterpret_cast<Stmt**> (&BaseExprOrSuperType); 2460 } 2461 return child_iterator(); 2462} 2463 2464Stmt::child_iterator ObjCPropertyRefExpr::child_end() 2465{ return BaseExprOrSuperType.is<Stmt*>() ? 2466 reinterpret_cast<Stmt**> (&BaseExprOrSuperType)+1 : 2467 child_iterator(); 2468} 2469 2470// ObjCImplicitSetterGetterRefExpr 2471Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2472 // If this is accessing a class member or super, skip that entry. 2473 // Technically, 2nd condition is sufficient. But I want to be verbose 2474 if (isSuperReceiver() || !Base) 2475 return child_iterator(); 2476 return &Base; 2477} 2478Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2479 if (isSuperReceiver() || !Base) 2480 return child_iterator(); 2481 return &Base+1; 2482} 2483 2484// ObjCIsaExpr 2485Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2486Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2487 2488// PredefinedExpr 2489Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2490Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2491 2492// IntegerLiteral 2493Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2494Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2495 2496// CharacterLiteral 2497Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2498Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2499 2500// FloatingLiteral 2501Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2502Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2503 2504// ImaginaryLiteral 2505Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2506Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2507 2508// StringLiteral 2509Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2510Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2511 2512// ParenExpr 2513Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2514Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2515 2516// UnaryOperator 2517Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2518Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2519 2520// OffsetOfExpr 2521Stmt::child_iterator OffsetOfExpr::child_begin() { 2522 return reinterpret_cast<Stmt **> (reinterpret_cast<OffsetOfNode *> (this + 1) 2523 + NumComps); 2524} 2525Stmt::child_iterator OffsetOfExpr::child_end() { 2526 return child_iterator(&*child_begin() + NumExprs); 2527} 2528 2529// SizeOfAlignOfExpr 2530Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2531 // If this is of a type and the type is a VLA type (and not a typedef), the 2532 // size expression of the VLA needs to be treated as an executable expression. 2533 // Why isn't this weirdness documented better in StmtIterator? 2534 if (isArgumentType()) { 2535 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2536 getArgumentType().getTypePtr())) 2537 return child_iterator(T); 2538 return child_iterator(); 2539 } 2540 return child_iterator(&Argument.Ex); 2541} 2542Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2543 if (isArgumentType()) 2544 return child_iterator(); 2545 return child_iterator(&Argument.Ex + 1); 2546} 2547 2548// ArraySubscriptExpr 2549Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2550 return &SubExprs[0]; 2551} 2552Stmt::child_iterator ArraySubscriptExpr::child_end() { 2553 return &SubExprs[0]+END_EXPR; 2554} 2555 2556// CallExpr 2557Stmt::child_iterator CallExpr::child_begin() { 2558 return &SubExprs[0]; 2559} 2560Stmt::child_iterator CallExpr::child_end() { 2561 return &SubExprs[0]+NumArgs+ARGS_START; 2562} 2563 2564// MemberExpr 2565Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2566Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2567 2568// ExtVectorElementExpr 2569Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2570Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2571 2572// CompoundLiteralExpr 2573Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2574Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2575 2576// CastExpr 2577Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2578Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2579 2580// BinaryOperator 2581Stmt::child_iterator BinaryOperator::child_begin() { 2582 return &SubExprs[0]; 2583} 2584Stmt::child_iterator BinaryOperator::child_end() { 2585 return &SubExprs[0]+END_EXPR; 2586} 2587 2588// ConditionalOperator 2589Stmt::child_iterator ConditionalOperator::child_begin() { 2590 return &SubExprs[0]; 2591} 2592Stmt::child_iterator ConditionalOperator::child_end() { 2593 return &SubExprs[0]+END_EXPR; 2594} 2595 2596// AddrLabelExpr 2597Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2598Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2599 2600// StmtExpr 2601Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2602Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2603 2604// TypesCompatibleExpr 2605Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2606 return child_iterator(); 2607} 2608 2609Stmt::child_iterator TypesCompatibleExpr::child_end() { 2610 return child_iterator(); 2611} 2612 2613// ChooseExpr 2614Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2615Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2616 2617// GNUNullExpr 2618Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2619Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2620 2621// ShuffleVectorExpr 2622Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2623 return &SubExprs[0]; 2624} 2625Stmt::child_iterator ShuffleVectorExpr::child_end() { 2626 return &SubExprs[0]+NumExprs; 2627} 2628 2629// VAArgExpr 2630Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2631Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2632 2633// InitListExpr 2634Stmt::child_iterator InitListExpr::child_begin() { 2635 return InitExprs.size() ? &InitExprs[0] : 0; 2636} 2637Stmt::child_iterator InitListExpr::child_end() { 2638 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2639} 2640 2641// DesignatedInitExpr 2642Stmt::child_iterator DesignatedInitExpr::child_begin() { 2643 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2644 Ptr += sizeof(DesignatedInitExpr); 2645 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2646} 2647Stmt::child_iterator DesignatedInitExpr::child_end() { 2648 return child_iterator(&*child_begin() + NumSubExprs); 2649} 2650 2651// ImplicitValueInitExpr 2652Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2653 return child_iterator(); 2654} 2655 2656Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2657 return child_iterator(); 2658} 2659 2660// ParenListExpr 2661Stmt::child_iterator ParenListExpr::child_begin() { 2662 return &Exprs[0]; 2663} 2664Stmt::child_iterator ParenListExpr::child_end() { 2665 return &Exprs[0]+NumExprs; 2666} 2667 2668// ObjCStringLiteral 2669Stmt::child_iterator ObjCStringLiteral::child_begin() { 2670 return &String; 2671} 2672Stmt::child_iterator ObjCStringLiteral::child_end() { 2673 return &String+1; 2674} 2675 2676// ObjCEncodeExpr 2677Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2678Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2679 2680// ObjCSelectorExpr 2681Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2682 return child_iterator(); 2683} 2684Stmt::child_iterator ObjCSelectorExpr::child_end() { 2685 return child_iterator(); 2686} 2687 2688// ObjCProtocolExpr 2689Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2690 return child_iterator(); 2691} 2692Stmt::child_iterator ObjCProtocolExpr::child_end() { 2693 return child_iterator(); 2694} 2695 2696// ObjCMessageExpr 2697Stmt::child_iterator ObjCMessageExpr::child_begin() { 2698 if (getReceiverKind() == Instance) 2699 return reinterpret_cast<Stmt **>(this + 1); 2700 return getArgs(); 2701} 2702Stmt::child_iterator ObjCMessageExpr::child_end() { 2703 return getArgs() + getNumArgs(); 2704} 2705 2706// Blocks 2707Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2708Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2709 2710Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2711Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2712