Expr.cpp revision 5cadfab3f2e7660453211eb0e00314bd40d93014
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 TypeDependent = false; 128 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 TypeDependent = true; 144 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 TypeDependent = true; 151 ValueDependent = true; 152 } 153 // (TD) - a template-id that is dependent, 154 else if (hasExplicitTemplateArgs() && 155 TemplateSpecializationType::anyDependentTemplateArguments( 156 getTemplateArgs(), 157 getNumTemplateArgs())) { 158 TypeDependent = true; 159 ValueDependent = true; 160 } 161 // (VD) - the name of a non-type template parameter, 162 else if (isa<NonTypeTemplateParmDecl>(D)) 163 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 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 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 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_BitCast: 746 return "BitCast"; 747 case CK_LValueBitCast: 748 return "LValueBitCast"; 749 case CK_NoOp: 750 return "NoOp"; 751 case CK_BaseToDerived: 752 return "BaseToDerived"; 753 case CK_DerivedToBase: 754 return "DerivedToBase"; 755 case CK_UncheckedDerivedToBase: 756 return "UncheckedDerivedToBase"; 757 case CK_Dynamic: 758 return "Dynamic"; 759 case CK_ToUnion: 760 return "ToUnion"; 761 case CK_ArrayToPointerDecay: 762 return "ArrayToPointerDecay"; 763 case CK_FunctionToPointerDecay: 764 return "FunctionToPointerDecay"; 765 case CK_NullToMemberPointer: 766 return "NullToMemberPointer"; 767 case CK_BaseToDerivedMemberPointer: 768 return "BaseToDerivedMemberPointer"; 769 case CK_DerivedToBaseMemberPointer: 770 return "DerivedToBaseMemberPointer"; 771 case CK_UserDefinedConversion: 772 return "UserDefinedConversion"; 773 case CK_ConstructorConversion: 774 return "ConstructorConversion"; 775 case CK_IntegralToPointer: 776 return "IntegralToPointer"; 777 case CK_PointerToIntegral: 778 return "PointerToIntegral"; 779 case CK_ToVoid: 780 return "ToVoid"; 781 case CK_VectorSplat: 782 return "VectorSplat"; 783 case CK_IntegralCast: 784 return "IntegralCast"; 785 case CK_IntegralToFloating: 786 return "IntegralToFloating"; 787 case CK_FloatingToIntegral: 788 return "FloatingToIntegral"; 789 case CK_FloatingCast: 790 return "FloatingCast"; 791 case CK_MemberPointerToBoolean: 792 return "MemberPointerToBoolean"; 793 case CK_AnyPointerToObjCPointerCast: 794 return "AnyPointerToObjCPointerCast"; 795 case CK_AnyPointerToBlockPointerCast: 796 return "AnyPointerToBlockPointerCast"; 797 case CK_ObjCObjectLValueCast: 798 return "ObjCObjectLValueCast"; 799 } 800 801 assert(0 && "Unhandled cast kind!"); 802 return 0; 803} 804 805Expr *CastExpr::getSubExprAsWritten() { 806 Expr *SubExpr = 0; 807 CastExpr *E = this; 808 do { 809 SubExpr = E->getSubExpr(); 810 811 // Skip any temporary bindings; they're implicit. 812 if (CXXBindTemporaryExpr *Binder = dyn_cast<CXXBindTemporaryExpr>(SubExpr)) 813 SubExpr = Binder->getSubExpr(); 814 815 // Conversions by constructor and conversion functions have a 816 // subexpression describing the call; strip it off. 817 if (E->getCastKind() == CK_ConstructorConversion) 818 SubExpr = cast<CXXConstructExpr>(SubExpr)->getArg(0); 819 else if (E->getCastKind() == CK_UserDefinedConversion) 820 SubExpr = cast<CXXMemberCallExpr>(SubExpr)->getImplicitObjectArgument(); 821 822 // If the subexpression we're left with is an implicit cast, look 823 // through that, too. 824 } while ((E = dyn_cast<ImplicitCastExpr>(SubExpr))); 825 826 return SubExpr; 827} 828 829CXXBaseSpecifier **CastExpr::path_buffer() { 830 switch (getStmtClass()) { 831#define ABSTRACT_STMT(x) 832#define CASTEXPR(Type, Base) \ 833 case Stmt::Type##Class: \ 834 return reinterpret_cast<CXXBaseSpecifier**>(static_cast<Type*>(this)+1); 835#define STMT(Type, Base) 836#include "clang/AST/StmtNodes.inc" 837 default: 838 llvm_unreachable("non-cast expressions not possible here"); 839 return 0; 840 } 841} 842 843void CastExpr::setCastPath(const CXXCastPath &Path) { 844 assert(Path.size() == path_size()); 845 memcpy(path_buffer(), Path.data(), Path.size() * sizeof(CXXBaseSpecifier*)); 846} 847 848ImplicitCastExpr *ImplicitCastExpr::Create(ASTContext &C, QualType T, 849 CastKind Kind, Expr *Operand, 850 const CXXCastPath *BasePath, 851 ExprValueKind VK) { 852 unsigned PathSize = (BasePath ? BasePath->size() : 0); 853 void *Buffer = 854 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 855 ImplicitCastExpr *E = 856 new (Buffer) ImplicitCastExpr(T, Kind, Operand, PathSize, VK); 857 if (PathSize) E->setCastPath(*BasePath); 858 return E; 859} 860 861ImplicitCastExpr *ImplicitCastExpr::CreateEmpty(ASTContext &C, 862 unsigned PathSize) { 863 void *Buffer = 864 C.Allocate(sizeof(ImplicitCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 865 return new (Buffer) ImplicitCastExpr(EmptyShell(), PathSize); 866} 867 868 869CStyleCastExpr *CStyleCastExpr::Create(ASTContext &C, QualType T, 870 CastKind K, Expr *Op, 871 const CXXCastPath *BasePath, 872 TypeSourceInfo *WrittenTy, 873 SourceLocation L, SourceLocation R) { 874 unsigned PathSize = (BasePath ? BasePath->size() : 0); 875 void *Buffer = 876 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 877 CStyleCastExpr *E = 878 new (Buffer) CStyleCastExpr(T, K, Op, PathSize, WrittenTy, L, R); 879 if (PathSize) E->setCastPath(*BasePath); 880 return E; 881} 882 883CStyleCastExpr *CStyleCastExpr::CreateEmpty(ASTContext &C, unsigned PathSize) { 884 void *Buffer = 885 C.Allocate(sizeof(CStyleCastExpr) + PathSize * sizeof(CXXBaseSpecifier*)); 886 return new (Buffer) CStyleCastExpr(EmptyShell(), PathSize); 887} 888 889/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 890/// corresponds to, e.g. "<<=". 891const char *BinaryOperator::getOpcodeStr(Opcode Op) { 892 switch (Op) { 893 case BO_PtrMemD: return ".*"; 894 case BO_PtrMemI: return "->*"; 895 case BO_Mul: return "*"; 896 case BO_Div: return "/"; 897 case BO_Rem: return "%"; 898 case BO_Add: return "+"; 899 case BO_Sub: return "-"; 900 case BO_Shl: return "<<"; 901 case BO_Shr: return ">>"; 902 case BO_LT: return "<"; 903 case BO_GT: return ">"; 904 case BO_LE: return "<="; 905 case BO_GE: return ">="; 906 case BO_EQ: return "=="; 907 case BO_NE: return "!="; 908 case BO_And: return "&"; 909 case BO_Xor: return "^"; 910 case BO_Or: return "|"; 911 case BO_LAnd: return "&&"; 912 case BO_LOr: return "||"; 913 case BO_Assign: return "="; 914 case BO_MulAssign: return "*="; 915 case BO_DivAssign: return "/="; 916 case BO_RemAssign: return "%="; 917 case BO_AddAssign: return "+="; 918 case BO_SubAssign: return "-="; 919 case BO_ShlAssign: return "<<="; 920 case BO_ShrAssign: return ">>="; 921 case BO_AndAssign: return "&="; 922 case BO_XorAssign: return "^="; 923 case BO_OrAssign: return "|="; 924 case BO_Comma: return ","; 925 } 926 927 return ""; 928} 929 930BinaryOperatorKind 931BinaryOperator::getOverloadedOpcode(OverloadedOperatorKind OO) { 932 switch (OO) { 933 default: assert(false && "Not an overloadable binary operator"); 934 case OO_Plus: return BO_Add; 935 case OO_Minus: return BO_Sub; 936 case OO_Star: return BO_Mul; 937 case OO_Slash: return BO_Div; 938 case OO_Percent: return BO_Rem; 939 case OO_Caret: return BO_Xor; 940 case OO_Amp: return BO_And; 941 case OO_Pipe: return BO_Or; 942 case OO_Equal: return BO_Assign; 943 case OO_Less: return BO_LT; 944 case OO_Greater: return BO_GT; 945 case OO_PlusEqual: return BO_AddAssign; 946 case OO_MinusEqual: return BO_SubAssign; 947 case OO_StarEqual: return BO_MulAssign; 948 case OO_SlashEqual: return BO_DivAssign; 949 case OO_PercentEqual: return BO_RemAssign; 950 case OO_CaretEqual: return BO_XorAssign; 951 case OO_AmpEqual: return BO_AndAssign; 952 case OO_PipeEqual: return BO_OrAssign; 953 case OO_LessLess: return BO_Shl; 954 case OO_GreaterGreater: return BO_Shr; 955 case OO_LessLessEqual: return BO_ShlAssign; 956 case OO_GreaterGreaterEqual: return BO_ShrAssign; 957 case OO_EqualEqual: return BO_EQ; 958 case OO_ExclaimEqual: return BO_NE; 959 case OO_LessEqual: return BO_LE; 960 case OO_GreaterEqual: return BO_GE; 961 case OO_AmpAmp: return BO_LAnd; 962 case OO_PipePipe: return BO_LOr; 963 case OO_Comma: return BO_Comma; 964 case OO_ArrowStar: return BO_PtrMemI; 965 } 966} 967 968OverloadedOperatorKind BinaryOperator::getOverloadedOperator(Opcode Opc) { 969 static const OverloadedOperatorKind OverOps[] = { 970 /* .* Cannot be overloaded */OO_None, OO_ArrowStar, 971 OO_Star, OO_Slash, OO_Percent, 972 OO_Plus, OO_Minus, 973 OO_LessLess, OO_GreaterGreater, 974 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 975 OO_EqualEqual, OO_ExclaimEqual, 976 OO_Amp, 977 OO_Caret, 978 OO_Pipe, 979 OO_AmpAmp, 980 OO_PipePipe, 981 OO_Equal, OO_StarEqual, 982 OO_SlashEqual, OO_PercentEqual, 983 OO_PlusEqual, OO_MinusEqual, 984 OO_LessLessEqual, OO_GreaterGreaterEqual, 985 OO_AmpEqual, OO_CaretEqual, 986 OO_PipeEqual, 987 OO_Comma 988 }; 989 return OverOps[Opc]; 990} 991 992InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc, 993 Expr **initExprs, unsigned numInits, 994 SourceLocation rbraceloc) 995 : Expr(InitListExprClass, QualType(), false, false), 996 InitExprs(C, numInits), 997 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0), 998 UnionFieldInit(0), HadArrayRangeDesignator(false) 999{ 1000 for (unsigned I = 0; I != numInits; ++I) { 1001 if (initExprs[I]->isTypeDependent()) 1002 TypeDependent = true; 1003 if (initExprs[I]->isValueDependent()) 1004 ValueDependent = true; 1005 } 1006 1007 InitExprs.insert(C, InitExprs.end(), initExprs, initExprs+numInits); 1008} 1009 1010void InitListExpr::reserveInits(ASTContext &C, unsigned NumInits) { 1011 if (NumInits > InitExprs.size()) 1012 InitExprs.reserve(C, NumInits); 1013} 1014 1015void InitListExpr::resizeInits(ASTContext &C, unsigned NumInits) { 1016 InitExprs.resize(C, NumInits, 0); 1017} 1018 1019Expr *InitListExpr::updateInit(ASTContext &C, unsigned Init, Expr *expr) { 1020 if (Init >= InitExprs.size()) { 1021 InitExprs.insert(C, InitExprs.end(), Init - InitExprs.size() + 1, 0); 1022 InitExprs.back() = expr; 1023 return 0; 1024 } 1025 1026 Expr *Result = cast_or_null<Expr>(InitExprs[Init]); 1027 InitExprs[Init] = expr; 1028 return Result; 1029} 1030 1031/// getFunctionType - Return the underlying function type for this block. 1032/// 1033const FunctionType *BlockExpr::getFunctionType() const { 1034 return getType()->getAs<BlockPointerType>()-> 1035 getPointeeType()->getAs<FunctionType>(); 1036} 1037 1038SourceLocation BlockExpr::getCaretLocation() const { 1039 return TheBlock->getCaretLocation(); 1040} 1041const Stmt *BlockExpr::getBody() const { 1042 return TheBlock->getBody(); 1043} 1044Stmt *BlockExpr::getBody() { 1045 return TheBlock->getBody(); 1046} 1047 1048 1049//===----------------------------------------------------------------------===// 1050// Generic Expression Routines 1051//===----------------------------------------------------------------------===// 1052 1053/// isUnusedResultAWarning - Return true if this immediate expression should 1054/// be warned about if the result is unused. If so, fill in Loc and Ranges 1055/// with location to warn on and the source range[s] to report with the 1056/// warning. 1057bool Expr::isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 1058 SourceRange &R2, ASTContext &Ctx) const { 1059 // Don't warn if the expr is type dependent. The type could end up 1060 // instantiating to void. 1061 if (isTypeDependent()) 1062 return false; 1063 1064 switch (getStmtClass()) { 1065 default: 1066 if (getType()->isVoidType()) 1067 return false; 1068 Loc = getExprLoc(); 1069 R1 = getSourceRange(); 1070 return true; 1071 case ParenExprClass: 1072 return cast<ParenExpr>(this)->getSubExpr()-> 1073 isUnusedResultAWarning(Loc, R1, R2, Ctx); 1074 case UnaryOperatorClass: { 1075 const UnaryOperator *UO = cast<UnaryOperator>(this); 1076 1077 switch (UO->getOpcode()) { 1078 default: break; 1079 case UO_PostInc: 1080 case UO_PostDec: 1081 case UO_PreInc: 1082 case UO_PreDec: // ++/-- 1083 return false; // Not a warning. 1084 case UO_Deref: 1085 // Dereferencing a volatile pointer is a side-effect. 1086 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1087 return false; 1088 break; 1089 case UO_Real: 1090 case UO_Imag: 1091 // accessing a piece of a volatile complex is a side-effect. 1092 if (Ctx.getCanonicalType(UO->getSubExpr()->getType()) 1093 .isVolatileQualified()) 1094 return false; 1095 break; 1096 case UO_Extension: 1097 return UO->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1098 } 1099 Loc = UO->getOperatorLoc(); 1100 R1 = UO->getSubExpr()->getSourceRange(); 1101 return true; 1102 } 1103 case BinaryOperatorClass: { 1104 const BinaryOperator *BO = cast<BinaryOperator>(this); 1105 switch (BO->getOpcode()) { 1106 default: 1107 break; 1108 // Consider the RHS of comma for side effects. LHS was checked by 1109 // Sema::CheckCommaOperands. 1110 case BO_Comma: 1111 // ((foo = <blah>), 0) is an idiom for hiding the result (and 1112 // lvalue-ness) of an assignment written in a macro. 1113 if (IntegerLiteral *IE = 1114 dyn_cast<IntegerLiteral>(BO->getRHS()->IgnoreParens())) 1115 if (IE->getValue() == 0) 1116 return false; 1117 return BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1118 // Consider '||', '&&' to have side effects if the LHS or RHS does. 1119 case BO_LAnd: 1120 case BO_LOr: 1121 if (!BO->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx) || 1122 !BO->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1123 return false; 1124 break; 1125 } 1126 if (BO->isAssignmentOp()) 1127 return false; 1128 Loc = BO->getOperatorLoc(); 1129 R1 = BO->getLHS()->getSourceRange(); 1130 R2 = BO->getRHS()->getSourceRange(); 1131 return true; 1132 } 1133 case CompoundAssignOperatorClass: 1134 case VAArgExprClass: 1135 return false; 1136 1137 case ConditionalOperatorClass: { 1138 // The condition must be evaluated, but if either the LHS or RHS is a 1139 // warning, warn about them. 1140 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 1141 if (Exp->getLHS() && 1142 Exp->getLHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx)) 1143 return true; 1144 return Exp->getRHS()->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1145 } 1146 1147 case MemberExprClass: 1148 // If the base pointer or element is to a volatile pointer/field, accessing 1149 // it is a side effect. 1150 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1151 return false; 1152 Loc = cast<MemberExpr>(this)->getMemberLoc(); 1153 R1 = SourceRange(Loc, Loc); 1154 R2 = cast<MemberExpr>(this)->getBase()->getSourceRange(); 1155 return true; 1156 1157 case ArraySubscriptExprClass: 1158 // If the base pointer or element is to a volatile pointer/field, accessing 1159 // it is a side effect. 1160 if (Ctx.getCanonicalType(getType()).isVolatileQualified()) 1161 return false; 1162 Loc = cast<ArraySubscriptExpr>(this)->getRBracketLoc(); 1163 R1 = cast<ArraySubscriptExpr>(this)->getLHS()->getSourceRange(); 1164 R2 = cast<ArraySubscriptExpr>(this)->getRHS()->getSourceRange(); 1165 return true; 1166 1167 case CallExprClass: 1168 case CXXOperatorCallExprClass: 1169 case CXXMemberCallExprClass: { 1170 // If this is a direct call, get the callee. 1171 const CallExpr *CE = cast<CallExpr>(this); 1172 if (const Decl *FD = CE->getCalleeDecl()) { 1173 // If the callee has attribute pure, const, or warn_unused_result, warn 1174 // about it. void foo() { strlen("bar"); } should warn. 1175 // 1176 // Note: If new cases are added here, DiagnoseUnusedExprResult should be 1177 // updated to match for QoI. 1178 if (FD->getAttr<WarnUnusedResultAttr>() || 1179 FD->getAttr<PureAttr>() || FD->getAttr<ConstAttr>()) { 1180 Loc = CE->getCallee()->getLocStart(); 1181 R1 = CE->getCallee()->getSourceRange(); 1182 1183 if (unsigned NumArgs = CE->getNumArgs()) 1184 R2 = SourceRange(CE->getArg(0)->getLocStart(), 1185 CE->getArg(NumArgs-1)->getLocEnd()); 1186 return true; 1187 } 1188 } 1189 return false; 1190 } 1191 1192 case CXXTemporaryObjectExprClass: 1193 case CXXConstructExprClass: 1194 return false; 1195 1196 case ObjCMessageExprClass: { 1197 const ObjCMessageExpr *ME = cast<ObjCMessageExpr>(this); 1198 const ObjCMethodDecl *MD = ME->getMethodDecl(); 1199 if (MD && MD->getAttr<WarnUnusedResultAttr>()) { 1200 Loc = getExprLoc(); 1201 return true; 1202 } 1203 return false; 1204 } 1205 1206 case ObjCImplicitSetterGetterRefExprClass: { // Dot syntax for message send. 1207#if 0 1208 const ObjCImplicitSetterGetterRefExpr *Ref = 1209 cast<ObjCImplicitSetterGetterRefExpr>(this); 1210 // FIXME: We really want the location of the '.' here. 1211 Loc = Ref->getLocation(); 1212 R1 = SourceRange(Ref->getLocation(), Ref->getLocation()); 1213 if (Ref->getBase()) 1214 R2 = Ref->getBase()->getSourceRange(); 1215#else 1216 Loc = getExprLoc(); 1217 R1 = getSourceRange(); 1218#endif 1219 return true; 1220 } 1221 case StmtExprClass: { 1222 // Statement exprs don't logically have side effects themselves, but are 1223 // sometimes used in macros in ways that give them a type that is unused. 1224 // For example ({ blah; foo(); }) will end up with a type if foo has a type. 1225 // however, if the result of the stmt expr is dead, we don't want to emit a 1226 // warning. 1227 const CompoundStmt *CS = cast<StmtExpr>(this)->getSubStmt(); 1228 if (!CS->body_empty()) { 1229 if (const Expr *E = dyn_cast<Expr>(CS->body_back())) 1230 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1231 if (const LabelStmt *Label = dyn_cast<LabelStmt>(CS->body_back())) 1232 if (const Expr *E = dyn_cast<Expr>(Label->getSubStmt())) 1233 return E->isUnusedResultAWarning(Loc, R1, R2, Ctx); 1234 } 1235 1236 if (getType()->isVoidType()) 1237 return false; 1238 Loc = cast<StmtExpr>(this)->getLParenLoc(); 1239 R1 = getSourceRange(); 1240 return true; 1241 } 1242 case CStyleCastExprClass: 1243 // If this is an explicit cast to void, allow it. People do this when they 1244 // think they know what they're doing :). 1245 if (getType()->isVoidType()) 1246 return false; 1247 Loc = cast<CStyleCastExpr>(this)->getLParenLoc(); 1248 R1 = cast<CStyleCastExpr>(this)->getSubExpr()->getSourceRange(); 1249 return true; 1250 case CXXFunctionalCastExprClass: { 1251 if (getType()->isVoidType()) 1252 return false; 1253 const CastExpr *CE = cast<CastExpr>(this); 1254 1255 // If this is a cast to void or a constructor conversion, check the operand. 1256 // Otherwise, the result of the cast is unused. 1257 if (CE->getCastKind() == CK_ToVoid || 1258 CE->getCastKind() == CK_ConstructorConversion) 1259 return (cast<CastExpr>(this)->getSubExpr() 1260 ->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1261 Loc = cast<CXXFunctionalCastExpr>(this)->getTypeBeginLoc(); 1262 R1 = cast<CXXFunctionalCastExpr>(this)->getSubExpr()->getSourceRange(); 1263 return true; 1264 } 1265 1266 case ImplicitCastExprClass: 1267 // Check the operand, since implicit casts are inserted by Sema 1268 return (cast<ImplicitCastExpr>(this) 1269 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1270 1271 case CXXDefaultArgExprClass: 1272 return (cast<CXXDefaultArgExpr>(this) 1273 ->getExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1274 1275 case CXXNewExprClass: 1276 // FIXME: In theory, there might be new expressions that don't have side 1277 // effects (e.g. a placement new with an uninitialized POD). 1278 case CXXDeleteExprClass: 1279 return false; 1280 case CXXBindTemporaryExprClass: 1281 return (cast<CXXBindTemporaryExpr>(this) 1282 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1283 case CXXExprWithTemporariesClass: 1284 return (cast<CXXExprWithTemporaries>(this) 1285 ->getSubExpr()->isUnusedResultAWarning(Loc, R1, R2, Ctx)); 1286 } 1287} 1288 1289/// isOBJCGCCandidate - Check if an expression is objc gc'able. 1290/// returns true, if it is; false otherwise. 1291bool Expr::isOBJCGCCandidate(ASTContext &Ctx) const { 1292 switch (getStmtClass()) { 1293 default: 1294 return false; 1295 case ObjCIvarRefExprClass: 1296 return true; 1297 case Expr::UnaryOperatorClass: 1298 return cast<UnaryOperator>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1299 case ParenExprClass: 1300 return cast<ParenExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1301 case ImplicitCastExprClass: 1302 return cast<ImplicitCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1303 case CStyleCastExprClass: 1304 return cast<CStyleCastExpr>(this)->getSubExpr()->isOBJCGCCandidate(Ctx); 1305 case DeclRefExprClass: { 1306 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 1307 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1308 if (VD->hasGlobalStorage()) 1309 return true; 1310 QualType T = VD->getType(); 1311 // dereferencing to a pointer is always a gc'able candidate, 1312 // unless it is __weak. 1313 return T->isPointerType() && 1314 (Ctx.getObjCGCAttrKind(T) != Qualifiers::Weak); 1315 } 1316 return false; 1317 } 1318 case MemberExprClass: { 1319 const MemberExpr *M = cast<MemberExpr>(this); 1320 return M->getBase()->isOBJCGCCandidate(Ctx); 1321 } 1322 case ArraySubscriptExprClass: 1323 return cast<ArraySubscriptExpr>(this)->getBase()->isOBJCGCCandidate(Ctx); 1324 } 1325} 1326 1327static Expr::CanThrowResult MergeCanThrow(Expr::CanThrowResult CT1, 1328 Expr::CanThrowResult CT2) { 1329 // CanThrowResult constants are ordered so that the maximum is the correct 1330 // merge result. 1331 return CT1 > CT2 ? CT1 : CT2; 1332} 1333 1334static Expr::CanThrowResult CanSubExprsThrow(ASTContext &C, const Expr *CE) { 1335 Expr *E = const_cast<Expr*>(CE); 1336 Expr::CanThrowResult R = Expr::CT_Cannot; 1337 for (Expr::child_iterator I = E->child_begin(), IE = E->child_end(); 1338 I != IE && R != Expr::CT_Can; ++I) { 1339 R = MergeCanThrow(R, cast<Expr>(*I)->CanThrow(C)); 1340 } 1341 return R; 1342} 1343 1344static Expr::CanThrowResult CanCalleeThrow(const Decl *D, 1345 bool NullThrows = true) { 1346 if (!D) 1347 return NullThrows ? Expr::CT_Can : Expr::CT_Cannot; 1348 1349 // See if we can get a function type from the decl somehow. 1350 const ValueDecl *VD = dyn_cast<ValueDecl>(D); 1351 if (!VD) // If we have no clue what we're calling, assume the worst. 1352 return Expr::CT_Can; 1353 1354 // As an extension, we assume that __attribute__((nothrow)) functions don't 1355 // throw. 1356 if (isa<FunctionDecl>(D) && D->hasAttr<NoThrowAttr>()) 1357 return Expr::CT_Cannot; 1358 1359 QualType T = VD->getType(); 1360 const FunctionProtoType *FT; 1361 if ((FT = T->getAs<FunctionProtoType>())) { 1362 } else if (const PointerType *PT = T->getAs<PointerType>()) 1363 FT = PT->getPointeeType()->getAs<FunctionProtoType>(); 1364 else if (const ReferenceType *RT = T->getAs<ReferenceType>()) 1365 FT = RT->getPointeeType()->getAs<FunctionProtoType>(); 1366 else if (const MemberPointerType *MT = T->getAs<MemberPointerType>()) 1367 FT = MT->getPointeeType()->getAs<FunctionProtoType>(); 1368 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1369 FT = BT->getPointeeType()->getAs<FunctionProtoType>(); 1370 1371 if (!FT) 1372 return Expr::CT_Can; 1373 1374 return FT->hasEmptyExceptionSpec() ? Expr::CT_Cannot : Expr::CT_Can; 1375} 1376 1377static Expr::CanThrowResult CanDynamicCastThrow(const CXXDynamicCastExpr *DC) { 1378 if (DC->isTypeDependent()) 1379 return Expr::CT_Dependent; 1380 1381 if (!DC->getTypeAsWritten()->isReferenceType()) 1382 return Expr::CT_Cannot; 1383 1384 return DC->getCastKind() == clang::CK_Dynamic? Expr::CT_Can : Expr::CT_Cannot; 1385} 1386 1387static Expr::CanThrowResult CanTypeidThrow(ASTContext &C, 1388 const CXXTypeidExpr *DC) { 1389 if (DC->isTypeOperand()) 1390 return Expr::CT_Cannot; 1391 1392 Expr *Op = DC->getExprOperand(); 1393 if (Op->isTypeDependent()) 1394 return Expr::CT_Dependent; 1395 1396 const RecordType *RT = Op->getType()->getAs<RecordType>(); 1397 if (!RT) 1398 return Expr::CT_Cannot; 1399 1400 if (!cast<CXXRecordDecl>(RT->getDecl())->isPolymorphic()) 1401 return Expr::CT_Cannot; 1402 1403 if (Op->Classify(C).isPRValue()) 1404 return Expr::CT_Cannot; 1405 1406 return Expr::CT_Can; 1407} 1408 1409Expr::CanThrowResult Expr::CanThrow(ASTContext &C) const { 1410 // C++ [expr.unary.noexcept]p3: 1411 // [Can throw] if in a potentially-evaluated context the expression would 1412 // contain: 1413 switch (getStmtClass()) { 1414 case CXXThrowExprClass: 1415 // - a potentially evaluated throw-expression 1416 return CT_Can; 1417 1418 case CXXDynamicCastExprClass: { 1419 // - a potentially evaluated dynamic_cast expression dynamic_cast<T>(v), 1420 // where T is a reference type, that requires a run-time check 1421 CanThrowResult CT = CanDynamicCastThrow(cast<CXXDynamicCastExpr>(this)); 1422 if (CT == CT_Can) 1423 return CT; 1424 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1425 } 1426 1427 case CXXTypeidExprClass: 1428 // - a potentially evaluated typeid expression applied to a glvalue 1429 // expression whose type is a polymorphic class type 1430 return CanTypeidThrow(C, cast<CXXTypeidExpr>(this)); 1431 1432 // - a potentially evaluated call to a function, member function, function 1433 // pointer, or member function pointer that does not have a non-throwing 1434 // exception-specification 1435 case CallExprClass: 1436 case CXXOperatorCallExprClass: 1437 case CXXMemberCallExprClass: { 1438 CanThrowResult CT = CanCalleeThrow(cast<CallExpr>(this)->getCalleeDecl()); 1439 if (CT == CT_Can) 1440 return CT; 1441 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1442 } 1443 1444 case CXXConstructExprClass: 1445 case CXXTemporaryObjectExprClass: { 1446 CanThrowResult CT = CanCalleeThrow( 1447 cast<CXXConstructExpr>(this)->getConstructor()); 1448 if (CT == CT_Can) 1449 return CT; 1450 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1451 } 1452 1453 case CXXNewExprClass: { 1454 CanThrowResult CT = MergeCanThrow( 1455 CanCalleeThrow(cast<CXXNewExpr>(this)->getOperatorNew()), 1456 CanCalleeThrow(cast<CXXNewExpr>(this)->getConstructor(), 1457 /*NullThrows*/false)); 1458 if (CT == CT_Can) 1459 return CT; 1460 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1461 } 1462 1463 case CXXDeleteExprClass: { 1464 CanThrowResult CT = CanCalleeThrow( 1465 cast<CXXDeleteExpr>(this)->getOperatorDelete()); 1466 if (CT == CT_Can) 1467 return CT; 1468 const Expr *Arg = cast<CXXDeleteExpr>(this)->getArgument(); 1469 // Unwrap exactly one implicit cast, which converts all pointers to void*. 1470 if (const ImplicitCastExpr *Cast = dyn_cast<ImplicitCastExpr>(Arg)) 1471 Arg = Cast->getSubExpr(); 1472 if (const PointerType *PT = Arg->getType()->getAs<PointerType>()) { 1473 if (const RecordType *RT = PT->getPointeeType()->getAs<RecordType>()) { 1474 CanThrowResult CT2 = CanCalleeThrow( 1475 cast<CXXRecordDecl>(RT->getDecl())->getDestructor()); 1476 if (CT2 == CT_Can) 1477 return CT2; 1478 CT = MergeCanThrow(CT, CT2); 1479 } 1480 } 1481 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1482 } 1483 1484 case CXXBindTemporaryExprClass: { 1485 // The bound temporary has to be destroyed again, which might throw. 1486 CanThrowResult CT = CanCalleeThrow( 1487 cast<CXXBindTemporaryExpr>(this)->getTemporary()->getDestructor()); 1488 if (CT == CT_Can) 1489 return CT; 1490 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1491 } 1492 1493 // ObjC message sends are like function calls, but never have exception 1494 // specs. 1495 case ObjCMessageExprClass: 1496 case ObjCPropertyRefExprClass: 1497 case ObjCImplicitSetterGetterRefExprClass: 1498 return CT_Can; 1499 1500 // Many other things have subexpressions, so we have to test those. 1501 // Some are simple: 1502 case ParenExprClass: 1503 case MemberExprClass: 1504 case CXXReinterpretCastExprClass: 1505 case CXXConstCastExprClass: 1506 case ConditionalOperatorClass: 1507 case CompoundLiteralExprClass: 1508 case ExtVectorElementExprClass: 1509 case InitListExprClass: 1510 case DesignatedInitExprClass: 1511 case ParenListExprClass: 1512 case VAArgExprClass: 1513 case CXXDefaultArgExprClass: 1514 case CXXExprWithTemporariesClass: 1515 case ObjCIvarRefExprClass: 1516 case ObjCIsaExprClass: 1517 case ShuffleVectorExprClass: 1518 return CanSubExprsThrow(C, this); 1519 1520 // Some might be dependent for other reasons. 1521 case UnaryOperatorClass: 1522 case ArraySubscriptExprClass: 1523 case ImplicitCastExprClass: 1524 case CStyleCastExprClass: 1525 case CXXStaticCastExprClass: 1526 case CXXFunctionalCastExprClass: 1527 case BinaryOperatorClass: 1528 case CompoundAssignOperatorClass: { 1529 CanThrowResult CT = isTypeDependent() ? CT_Dependent : CT_Cannot; 1530 return MergeCanThrow(CT, CanSubExprsThrow(C, this)); 1531 } 1532 1533 // FIXME: We should handle StmtExpr, but that opens a MASSIVE can of worms. 1534 case StmtExprClass: 1535 return CT_Can; 1536 1537 case ChooseExprClass: 1538 if (isTypeDependent() || isValueDependent()) 1539 return CT_Dependent; 1540 return cast<ChooseExpr>(this)->getChosenSubExpr(C)->CanThrow(C); 1541 1542 // Some expressions are always dependent. 1543 case DependentScopeDeclRefExprClass: 1544 case CXXUnresolvedConstructExprClass: 1545 case CXXDependentScopeMemberExprClass: 1546 return CT_Dependent; 1547 1548 default: 1549 // All other expressions don't have subexpressions, or else they are 1550 // unevaluated. 1551 return CT_Cannot; 1552 } 1553} 1554 1555Expr* Expr::IgnoreParens() { 1556 Expr* E = this; 1557 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 1558 E = P->getSubExpr(); 1559 1560 return E; 1561} 1562 1563/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 1564/// or CastExprs or ImplicitCastExprs, returning their operand. 1565Expr *Expr::IgnoreParenCasts() { 1566 Expr *E = this; 1567 while (true) { 1568 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1569 E = P->getSubExpr(); 1570 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 1571 E = P->getSubExpr(); 1572 else 1573 return E; 1574 } 1575} 1576 1577Expr *Expr::IgnoreParenImpCasts() { 1578 Expr *E = this; 1579 while (true) { 1580 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 1581 E = P->getSubExpr(); 1582 else if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) 1583 E = P->getSubExpr(); 1584 else 1585 return E; 1586 } 1587} 1588 1589/// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 1590/// value (including ptr->int casts of the same size). Strip off any 1591/// ParenExpr or CastExprs, returning their operand. 1592Expr *Expr::IgnoreParenNoopCasts(ASTContext &Ctx) { 1593 Expr *E = this; 1594 while (true) { 1595 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) { 1596 E = P->getSubExpr(); 1597 continue; 1598 } 1599 1600 if (CastExpr *P = dyn_cast<CastExpr>(E)) { 1601 // We ignore integer <-> casts that are of the same width, ptr<->ptr and 1602 // ptr<->int casts of the same width. We also ignore all identity casts. 1603 Expr *SE = P->getSubExpr(); 1604 1605 if (Ctx.hasSameUnqualifiedType(E->getType(), SE->getType())) { 1606 E = SE; 1607 continue; 1608 } 1609 1610 if ((E->getType()->isPointerType() || 1611 E->getType()->isIntegralType(Ctx)) && 1612 (SE->getType()->isPointerType() || 1613 SE->getType()->isIntegralType(Ctx)) && 1614 Ctx.getTypeSize(E->getType()) == Ctx.getTypeSize(SE->getType())) { 1615 E = SE; 1616 continue; 1617 } 1618 } 1619 1620 return E; 1621 } 1622} 1623 1624bool Expr::isDefaultArgument() const { 1625 const Expr *E = this; 1626 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) 1627 E = ICE->getSubExprAsWritten(); 1628 1629 return isa<CXXDefaultArgExpr>(E); 1630} 1631 1632/// \brief Skip over any no-op casts and any temporary-binding 1633/// expressions. 1634static const Expr *skipTemporaryBindingsAndNoOpCasts(const Expr *E) { 1635 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1636 if (ICE->getCastKind() == CK_NoOp) 1637 E = ICE->getSubExpr(); 1638 else 1639 break; 1640 } 1641 1642 while (const CXXBindTemporaryExpr *BE = dyn_cast<CXXBindTemporaryExpr>(E)) 1643 E = BE->getSubExpr(); 1644 1645 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1646 if (ICE->getCastKind() == CK_NoOp) 1647 E = ICE->getSubExpr(); 1648 else 1649 break; 1650 } 1651 1652 return E; 1653} 1654 1655/// isTemporaryObject - Determines if this expression produces a 1656/// temporary of the given class type. 1657bool Expr::isTemporaryObject(ASTContext &C, const CXXRecordDecl *TempTy) const { 1658 if (!C.hasSameUnqualifiedType(getType(), C.getTypeDeclType(TempTy))) 1659 return false; 1660 1661 const Expr *E = skipTemporaryBindingsAndNoOpCasts(this); 1662 1663 // Temporaries are by definition pr-values of class type. 1664 if (!E->Classify(C).isPRValue()) return false; 1665 1666 // Black-list a few cases which yield pr-values of class type that don't 1667 // refer to temporaries of that type: 1668 1669 // - implicit derived-to-base conversions 1670 if (isa<ImplicitCastExpr>(E)) { 1671 switch (cast<ImplicitCastExpr>(E)->getCastKind()) { 1672 case CK_DerivedToBase: 1673 case CK_UncheckedDerivedToBase: 1674 return false; 1675 default: 1676 break; 1677 } 1678 } 1679 1680 // - member expressions (all) 1681 if (isa<MemberExpr>(E)) 1682 return false; 1683 1684 return true; 1685} 1686 1687/// hasAnyTypeDependentArguments - Determines if any of the expressions 1688/// in Exprs is type-dependent. 1689bool Expr::hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs) { 1690 for (unsigned I = 0; I < NumExprs; ++I) 1691 if (Exprs[I]->isTypeDependent()) 1692 return true; 1693 1694 return false; 1695} 1696 1697/// hasAnyValueDependentArguments - Determines if any of the expressions 1698/// in Exprs is value-dependent. 1699bool Expr::hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs) { 1700 for (unsigned I = 0; I < NumExprs; ++I) 1701 if (Exprs[I]->isValueDependent()) 1702 return true; 1703 1704 return false; 1705} 1706 1707bool Expr::isConstantInitializer(ASTContext &Ctx, bool IsForRef) const { 1708 // This function is attempting whether an expression is an initializer 1709 // which can be evaluated at compile-time. isEvaluatable handles most 1710 // of the cases, but it can't deal with some initializer-specific 1711 // expressions, and it can't deal with aggregates; we deal with those here, 1712 // and fall back to isEvaluatable for the other cases. 1713 1714 // If we ever capture reference-binding directly in the AST, we can 1715 // kill the second parameter. 1716 1717 if (IsForRef) { 1718 EvalResult Result; 1719 return EvaluateAsLValue(Result, Ctx) && !Result.HasSideEffects; 1720 } 1721 1722 switch (getStmtClass()) { 1723 default: break; 1724 case StringLiteralClass: 1725 case ObjCStringLiteralClass: 1726 case ObjCEncodeExprClass: 1727 return true; 1728 case CXXTemporaryObjectExprClass: 1729 case CXXConstructExprClass: { 1730 const CXXConstructExpr *CE = cast<CXXConstructExpr>(this); 1731 1732 // Only if it's 1733 // 1) an application of the trivial default constructor or 1734 if (!CE->getConstructor()->isTrivial()) return false; 1735 if (!CE->getNumArgs()) return true; 1736 1737 // 2) an elidable trivial copy construction of an operand which is 1738 // itself a constant initializer. Note that we consider the 1739 // operand on its own, *not* as a reference binding. 1740 return CE->isElidable() && 1741 CE->getArg(0)->isConstantInitializer(Ctx, false); 1742 } 1743 case CompoundLiteralExprClass: { 1744 // This handles gcc's extension that allows global initializers like 1745 // "struct x {int x;} x = (struct x) {};". 1746 // FIXME: This accepts other cases it shouldn't! 1747 const Expr *Exp = cast<CompoundLiteralExpr>(this)->getInitializer(); 1748 return Exp->isConstantInitializer(Ctx, false); 1749 } 1750 case InitListExprClass: { 1751 // FIXME: This doesn't deal with fields with reference types correctly. 1752 // FIXME: This incorrectly allows pointers cast to integers to be assigned 1753 // to bitfields. 1754 const InitListExpr *Exp = cast<InitListExpr>(this); 1755 unsigned numInits = Exp->getNumInits(); 1756 for (unsigned i = 0; i < numInits; i++) { 1757 if (!Exp->getInit(i)->isConstantInitializer(Ctx, false)) 1758 return false; 1759 } 1760 return true; 1761 } 1762 case ImplicitValueInitExprClass: 1763 return true; 1764 case ParenExprClass: 1765 return cast<ParenExpr>(this)->getSubExpr() 1766 ->isConstantInitializer(Ctx, IsForRef); 1767 case ChooseExprClass: 1768 return cast<ChooseExpr>(this)->getChosenSubExpr(Ctx) 1769 ->isConstantInitializer(Ctx, IsForRef); 1770 case UnaryOperatorClass: { 1771 const UnaryOperator* Exp = cast<UnaryOperator>(this); 1772 if (Exp->getOpcode() == UO_Extension) 1773 return Exp->getSubExpr()->isConstantInitializer(Ctx, false); 1774 break; 1775 } 1776 case BinaryOperatorClass: { 1777 // Special case &&foo - &&bar. It would be nice to generalize this somehow 1778 // but this handles the common case. 1779 const BinaryOperator *Exp = cast<BinaryOperator>(this); 1780 if (Exp->getOpcode() == BO_Sub && 1781 isa<AddrLabelExpr>(Exp->getLHS()->IgnoreParenNoopCasts(Ctx)) && 1782 isa<AddrLabelExpr>(Exp->getRHS()->IgnoreParenNoopCasts(Ctx))) 1783 return true; 1784 break; 1785 } 1786 case CXXFunctionalCastExprClass: 1787 case CXXStaticCastExprClass: 1788 case ImplicitCastExprClass: 1789 case CStyleCastExprClass: 1790 // Handle casts with a destination that's a struct or union; this 1791 // deals with both the gcc no-op struct cast extension and the 1792 // cast-to-union extension. 1793 if (getType()->isRecordType()) 1794 return cast<CastExpr>(this)->getSubExpr() 1795 ->isConstantInitializer(Ctx, false); 1796 1797 // Integer->integer casts can be handled here, which is important for 1798 // things like (int)(&&x-&&y). Scary but true. 1799 if (getType()->isIntegerType() && 1800 cast<CastExpr>(this)->getSubExpr()->getType()->isIntegerType()) 1801 return cast<CastExpr>(this)->getSubExpr() 1802 ->isConstantInitializer(Ctx, false); 1803 1804 break; 1805 } 1806 return isEvaluatable(Ctx); 1807} 1808 1809/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1810/// integer constant expression with the value zero, or if this is one that is 1811/// cast to void*. 1812bool Expr::isNullPointerConstant(ASTContext &Ctx, 1813 NullPointerConstantValueDependence NPC) const { 1814 if (isValueDependent()) { 1815 switch (NPC) { 1816 case NPC_NeverValueDependent: 1817 assert(false && "Unexpected value dependent expression!"); 1818 // If the unthinkable happens, fall through to the safest alternative. 1819 1820 case NPC_ValueDependentIsNull: 1821 return isTypeDependent() || getType()->isIntegralType(Ctx); 1822 1823 case NPC_ValueDependentIsNotNull: 1824 return false; 1825 } 1826 } 1827 1828 // Strip off a cast to void*, if it exists. Except in C++. 1829 if (const ExplicitCastExpr *CE = dyn_cast<ExplicitCastExpr>(this)) { 1830 if (!Ctx.getLangOptions().CPlusPlus) { 1831 // Check that it is a cast to void*. 1832 if (const PointerType *PT = CE->getType()->getAs<PointerType>()) { 1833 QualType Pointee = PT->getPointeeType(); 1834 if (!Pointee.hasQualifiers() && 1835 Pointee->isVoidType() && // to void* 1836 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1837 return CE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1838 } 1839 } 1840 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1841 // Ignore the ImplicitCastExpr type entirely. 1842 return ICE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1843 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1844 // Accept ((void*)0) as a null pointer constant, as many other 1845 // implementations do. 1846 return PE->getSubExpr()->isNullPointerConstant(Ctx, NPC); 1847 } else if (const CXXDefaultArgExpr *DefaultArg 1848 = dyn_cast<CXXDefaultArgExpr>(this)) { 1849 // See through default argument expressions 1850 return DefaultArg->getExpr()->isNullPointerConstant(Ctx, NPC); 1851 } else if (isa<GNUNullExpr>(this)) { 1852 // The GNU __null extension is always a null pointer constant. 1853 return true; 1854 } 1855 1856 // C++0x nullptr_t is always a null pointer constant. 1857 if (getType()->isNullPtrType()) 1858 return true; 1859 1860 // This expression must be an integer type. 1861 if (!getType()->isIntegerType() || 1862 (Ctx.getLangOptions().CPlusPlus && getType()->isEnumeralType())) 1863 return false; 1864 1865 // If we have an integer constant expression, we need to *evaluate* it and 1866 // test for the value 0. 1867 llvm::APSInt Result; 1868 return isIntegerConstantExpr(Result, Ctx) && Result == 0; 1869} 1870 1871FieldDecl *Expr::getBitField() { 1872 Expr *E = this->IgnoreParens(); 1873 1874 while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1875 if (ICE->getValueKind() != VK_RValue && 1876 ICE->getCastKind() == CK_NoOp) 1877 E = ICE->getSubExpr()->IgnoreParens(); 1878 else 1879 break; 1880 } 1881 1882 if (MemberExpr *MemRef = dyn_cast<MemberExpr>(E)) 1883 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemRef->getMemberDecl())) 1884 if (Field->isBitField()) 1885 return Field; 1886 1887 if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(E)) 1888 if (BinOp->isAssignmentOp() && BinOp->getLHS()) 1889 return BinOp->getLHS()->getBitField(); 1890 1891 return 0; 1892} 1893 1894bool Expr::refersToVectorElement() const { 1895 const Expr *E = this->IgnoreParens(); 1896 1897 while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E)) { 1898 if (ICE->getValueKind() != VK_RValue && 1899 ICE->getCastKind() == CK_NoOp) 1900 E = ICE->getSubExpr()->IgnoreParens(); 1901 else 1902 break; 1903 } 1904 1905 if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) 1906 return ASE->getBase()->getType()->isVectorType(); 1907 1908 if (isa<ExtVectorElementExpr>(E)) 1909 return true; 1910 1911 return false; 1912} 1913 1914/// isArrow - Return true if the base expression is a pointer to vector, 1915/// return false if the base expression is a vector. 1916bool ExtVectorElementExpr::isArrow() const { 1917 return getBase()->getType()->isPointerType(); 1918} 1919 1920unsigned ExtVectorElementExpr::getNumElements() const { 1921 if (const VectorType *VT = getType()->getAs<VectorType>()) 1922 return VT->getNumElements(); 1923 return 1; 1924} 1925 1926/// containsDuplicateElements - Return true if any element access is repeated. 1927bool ExtVectorElementExpr::containsDuplicateElements() const { 1928 // FIXME: Refactor this code to an accessor on the AST node which returns the 1929 // "type" of component access, and share with code below and in Sema. 1930 llvm::StringRef Comp = Accessor->getName(); 1931 1932 // Halving swizzles do not contain duplicate elements. 1933 if (Comp == "hi" || Comp == "lo" || Comp == "even" || Comp == "odd") 1934 return false; 1935 1936 // Advance past s-char prefix on hex swizzles. 1937 if (Comp[0] == 's' || Comp[0] == 'S') 1938 Comp = Comp.substr(1); 1939 1940 for (unsigned i = 0, e = Comp.size(); i != e; ++i) 1941 if (Comp.substr(i + 1).find(Comp[i]) != llvm::StringRef::npos) 1942 return true; 1943 1944 return false; 1945} 1946 1947/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 1948void ExtVectorElementExpr::getEncodedElementAccess( 1949 llvm::SmallVectorImpl<unsigned> &Elts) const { 1950 llvm::StringRef Comp = Accessor->getName(); 1951 if (Comp[0] == 's' || Comp[0] == 'S') 1952 Comp = Comp.substr(1); 1953 1954 bool isHi = Comp == "hi"; 1955 bool isLo = Comp == "lo"; 1956 bool isEven = Comp == "even"; 1957 bool isOdd = Comp == "odd"; 1958 1959 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 1960 uint64_t Index; 1961 1962 if (isHi) 1963 Index = e + i; 1964 else if (isLo) 1965 Index = i; 1966 else if (isEven) 1967 Index = 2 * i; 1968 else if (isOdd) 1969 Index = 2 * i + 1; 1970 else 1971 Index = ExtVectorType::getAccessorIdx(Comp[i]); 1972 1973 Elts.push_back(Index); 1974 } 1975} 1976 1977ObjCMessageExpr::ObjCMessageExpr(QualType T, 1978 SourceLocation LBracLoc, 1979 SourceLocation SuperLoc, 1980 bool IsInstanceSuper, 1981 QualType SuperType, 1982 Selector Sel, 1983 ObjCMethodDecl *Method, 1984 Expr **Args, unsigned NumArgs, 1985 SourceLocation RBracLoc) 1986 : Expr(ObjCMessageExprClass, T, /*TypeDependent=*/false, 1987 /*ValueDependent=*/false), 1988 NumArgs(NumArgs), Kind(IsInstanceSuper? SuperInstance : SuperClass), 1989 HasMethod(Method != 0), SuperLoc(SuperLoc), 1990 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 1991 : Sel.getAsOpaquePtr())), 1992 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 1993{ 1994 setReceiverPointer(SuperType.getAsOpaquePtr()); 1995 if (NumArgs) 1996 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 1997} 1998 1999ObjCMessageExpr::ObjCMessageExpr(QualType T, 2000 SourceLocation LBracLoc, 2001 TypeSourceInfo *Receiver, 2002 Selector Sel, 2003 ObjCMethodDecl *Method, 2004 Expr **Args, unsigned NumArgs, 2005 SourceLocation RBracLoc) 2006 : Expr(ObjCMessageExprClass, T, T->isDependentType(), 2007 (T->isDependentType() || 2008 hasAnyValueDependentArguments(Args, NumArgs))), 2009 NumArgs(NumArgs), Kind(Class), HasMethod(Method != 0), 2010 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2011 : Sel.getAsOpaquePtr())), 2012 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2013{ 2014 setReceiverPointer(Receiver); 2015 if (NumArgs) 2016 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2017} 2018 2019ObjCMessageExpr::ObjCMessageExpr(QualType T, 2020 SourceLocation LBracLoc, 2021 Expr *Receiver, 2022 Selector Sel, 2023 ObjCMethodDecl *Method, 2024 Expr **Args, unsigned NumArgs, 2025 SourceLocation RBracLoc) 2026 : Expr(ObjCMessageExprClass, T, Receiver->isTypeDependent(), 2027 (Receiver->isTypeDependent() || 2028 hasAnyValueDependentArguments(Args, NumArgs))), 2029 NumArgs(NumArgs), Kind(Instance), HasMethod(Method != 0), 2030 SelectorOrMethod(reinterpret_cast<uintptr_t>(Method? Method 2031 : Sel.getAsOpaquePtr())), 2032 LBracLoc(LBracLoc), RBracLoc(RBracLoc) 2033{ 2034 setReceiverPointer(Receiver); 2035 if (NumArgs) 2036 memcpy(getArgs(), Args, NumArgs * sizeof(Expr *)); 2037} 2038 2039ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2040 SourceLocation LBracLoc, 2041 SourceLocation SuperLoc, 2042 bool IsInstanceSuper, 2043 QualType SuperType, 2044 Selector Sel, 2045 ObjCMethodDecl *Method, 2046 Expr **Args, unsigned NumArgs, 2047 SourceLocation RBracLoc) { 2048 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2049 NumArgs * sizeof(Expr *); 2050 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2051 return new (Mem) ObjCMessageExpr(T, LBracLoc, SuperLoc, IsInstanceSuper, 2052 SuperType, Sel, Method, Args, NumArgs, 2053 RBracLoc); 2054} 2055 2056ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2057 SourceLocation LBracLoc, 2058 TypeSourceInfo *Receiver, 2059 Selector Sel, 2060 ObjCMethodDecl *Method, 2061 Expr **Args, unsigned NumArgs, 2062 SourceLocation RBracLoc) { 2063 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2064 NumArgs * sizeof(Expr *); 2065 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2066 return new (Mem) ObjCMessageExpr(T, LBracLoc, Receiver, Sel, Method, Args, 2067 NumArgs, RBracLoc); 2068} 2069 2070ObjCMessageExpr *ObjCMessageExpr::Create(ASTContext &Context, QualType T, 2071 SourceLocation LBracLoc, 2072 Expr *Receiver, 2073 Selector Sel, 2074 ObjCMethodDecl *Method, 2075 Expr **Args, unsigned NumArgs, 2076 SourceLocation RBracLoc) { 2077 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2078 NumArgs * sizeof(Expr *); 2079 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2080 return new (Mem) ObjCMessageExpr(T, LBracLoc, Receiver, Sel, Method, Args, 2081 NumArgs, RBracLoc); 2082} 2083 2084ObjCMessageExpr *ObjCMessageExpr::CreateEmpty(ASTContext &Context, 2085 unsigned NumArgs) { 2086 unsigned Size = sizeof(ObjCMessageExpr) + sizeof(void *) + 2087 NumArgs * sizeof(Expr *); 2088 void *Mem = Context.Allocate(Size, llvm::AlignOf<ObjCMessageExpr>::Alignment); 2089 return new (Mem) ObjCMessageExpr(EmptyShell(), NumArgs); 2090} 2091 2092Selector ObjCMessageExpr::getSelector() const { 2093 if (HasMethod) 2094 return reinterpret_cast<const ObjCMethodDecl *>(SelectorOrMethod) 2095 ->getSelector(); 2096 return Selector(SelectorOrMethod); 2097} 2098 2099ObjCInterfaceDecl *ObjCMessageExpr::getReceiverInterface() const { 2100 switch (getReceiverKind()) { 2101 case Instance: 2102 if (const ObjCObjectPointerType *Ptr 2103 = getInstanceReceiver()->getType()->getAs<ObjCObjectPointerType>()) 2104 return Ptr->getInterfaceDecl(); 2105 break; 2106 2107 case Class: 2108 if (const ObjCObjectType *Ty 2109 = getClassReceiver()->getAs<ObjCObjectType>()) 2110 return Ty->getInterface(); 2111 break; 2112 2113 case SuperInstance: 2114 if (const ObjCObjectPointerType *Ptr 2115 = getSuperType()->getAs<ObjCObjectPointerType>()) 2116 return Ptr->getInterfaceDecl(); 2117 break; 2118 2119 case SuperClass: 2120 if (const ObjCObjectPointerType *Iface 2121 = getSuperType()->getAs<ObjCObjectPointerType>()) 2122 return Iface->getInterfaceDecl(); 2123 break; 2124 } 2125 2126 return 0; 2127} 2128 2129bool ChooseExpr::isConditionTrue(ASTContext &C) const { 2130 return getCond()->EvaluateAsInt(C) != 0; 2131} 2132 2133void ShuffleVectorExpr::setExprs(ASTContext &C, Expr ** Exprs, 2134 unsigned NumExprs) { 2135 if (SubExprs) C.Deallocate(SubExprs); 2136 2137 SubExprs = new (C) Stmt* [NumExprs]; 2138 this->NumExprs = NumExprs; 2139 memcpy(SubExprs, Exprs, sizeof(Expr *) * NumExprs); 2140} 2141 2142//===----------------------------------------------------------------------===// 2143// DesignatedInitExpr 2144//===----------------------------------------------------------------------===// 2145 2146IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() { 2147 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2148 if (Field.NameOrField & 0x01) 2149 return reinterpret_cast<IdentifierInfo *>(Field.NameOrField&~0x01); 2150 else 2151 return getField()->getIdentifier(); 2152} 2153 2154DesignatedInitExpr::DesignatedInitExpr(ASTContext &C, QualType Ty, 2155 unsigned NumDesignators, 2156 const Designator *Designators, 2157 SourceLocation EqualOrColonLoc, 2158 bool GNUSyntax, 2159 Expr **IndexExprs, 2160 unsigned NumIndexExprs, 2161 Expr *Init) 2162 : Expr(DesignatedInitExprClass, Ty, 2163 Init->isTypeDependent(), Init->isValueDependent()), 2164 EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax), 2165 NumDesignators(NumDesignators), NumSubExprs(NumIndexExprs + 1) { 2166 this->Designators = new (C) Designator[NumDesignators]; 2167 2168 // Record the initializer itself. 2169 child_iterator Child = child_begin(); 2170 *Child++ = Init; 2171 2172 // Copy the designators and their subexpressions, computing 2173 // value-dependence along the way. 2174 unsigned IndexIdx = 0; 2175 for (unsigned I = 0; I != NumDesignators; ++I) { 2176 this->Designators[I] = Designators[I]; 2177 2178 if (this->Designators[I].isArrayDesignator()) { 2179 // Compute type- and value-dependence. 2180 Expr *Index = IndexExprs[IndexIdx]; 2181 ValueDependent = ValueDependent || 2182 Index->isTypeDependent() || Index->isValueDependent(); 2183 2184 // Copy the index expressions into permanent storage. 2185 *Child++ = IndexExprs[IndexIdx++]; 2186 } else if (this->Designators[I].isArrayRangeDesignator()) { 2187 // Compute type- and value-dependence. 2188 Expr *Start = IndexExprs[IndexIdx]; 2189 Expr *End = IndexExprs[IndexIdx + 1]; 2190 ValueDependent = ValueDependent || 2191 Start->isTypeDependent() || Start->isValueDependent() || 2192 End->isTypeDependent() || End->isValueDependent(); 2193 2194 // Copy the start/end expressions into permanent storage. 2195 *Child++ = IndexExprs[IndexIdx++]; 2196 *Child++ = IndexExprs[IndexIdx++]; 2197 } 2198 } 2199 2200 assert(IndexIdx == NumIndexExprs && "Wrong number of index expressions"); 2201} 2202 2203DesignatedInitExpr * 2204DesignatedInitExpr::Create(ASTContext &C, Designator *Designators, 2205 unsigned NumDesignators, 2206 Expr **IndexExprs, unsigned NumIndexExprs, 2207 SourceLocation ColonOrEqualLoc, 2208 bool UsesColonSyntax, Expr *Init) { 2209 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2210 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2211 return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators, 2212 ColonOrEqualLoc, UsesColonSyntax, 2213 IndexExprs, NumIndexExprs, Init); 2214} 2215 2216DesignatedInitExpr *DesignatedInitExpr::CreateEmpty(ASTContext &C, 2217 unsigned NumIndexExprs) { 2218 void *Mem = C.Allocate(sizeof(DesignatedInitExpr) + 2219 sizeof(Stmt *) * (NumIndexExprs + 1), 8); 2220 return new (Mem) DesignatedInitExpr(NumIndexExprs + 1); 2221} 2222 2223void DesignatedInitExpr::setDesignators(ASTContext &C, 2224 const Designator *Desigs, 2225 unsigned NumDesigs) { 2226 Designators = new (C) Designator[NumDesigs]; 2227 NumDesignators = NumDesigs; 2228 for (unsigned I = 0; I != NumDesigs; ++I) 2229 Designators[I] = Desigs[I]; 2230} 2231 2232SourceRange DesignatedInitExpr::getSourceRange() const { 2233 SourceLocation StartLoc; 2234 Designator &First = 2235 *const_cast<DesignatedInitExpr*>(this)->designators_begin(); 2236 if (First.isFieldDesignator()) { 2237 if (GNUSyntax) 2238 StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc); 2239 else 2240 StartLoc = SourceLocation::getFromRawEncoding(First.Field.DotLoc); 2241 } else 2242 StartLoc = 2243 SourceLocation::getFromRawEncoding(First.ArrayOrRange.LBracketLoc); 2244 return SourceRange(StartLoc, getInit()->getSourceRange().getEnd()); 2245} 2246 2247Expr *DesignatedInitExpr::getArrayIndex(const Designator& D) { 2248 assert(D.Kind == Designator::ArrayDesignator && "Requires array designator"); 2249 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2250 Ptr += sizeof(DesignatedInitExpr); 2251 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2252 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2253} 2254 2255Expr *DesignatedInitExpr::getArrayRangeStart(const Designator& D) { 2256 assert(D.Kind == Designator::ArrayRangeDesignator && 2257 "Requires array range designator"); 2258 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2259 Ptr += sizeof(DesignatedInitExpr); 2260 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2261 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 1)); 2262} 2263 2264Expr *DesignatedInitExpr::getArrayRangeEnd(const Designator& D) { 2265 assert(D.Kind == Designator::ArrayRangeDesignator && 2266 "Requires array range designator"); 2267 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2268 Ptr += sizeof(DesignatedInitExpr); 2269 Stmt **SubExprs = reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2270 return cast<Expr>(*(SubExprs + D.ArrayOrRange.Index + 2)); 2271} 2272 2273/// \brief Replaces the designator at index @p Idx with the series 2274/// of designators in [First, Last). 2275void DesignatedInitExpr::ExpandDesignator(ASTContext &C, unsigned Idx, 2276 const Designator *First, 2277 const Designator *Last) { 2278 unsigned NumNewDesignators = Last - First; 2279 if (NumNewDesignators == 0) { 2280 std::copy_backward(Designators + Idx + 1, 2281 Designators + NumDesignators, 2282 Designators + Idx); 2283 --NumNewDesignators; 2284 return; 2285 } else if (NumNewDesignators == 1) { 2286 Designators[Idx] = *First; 2287 return; 2288 } 2289 2290 Designator *NewDesignators 2291 = new (C) Designator[NumDesignators - 1 + NumNewDesignators]; 2292 std::copy(Designators, Designators + Idx, NewDesignators); 2293 std::copy(First, Last, NewDesignators + Idx); 2294 std::copy(Designators + Idx + 1, Designators + NumDesignators, 2295 NewDesignators + Idx + NumNewDesignators); 2296 Designators = NewDesignators; 2297 NumDesignators = NumDesignators - 1 + NumNewDesignators; 2298} 2299 2300ParenListExpr::ParenListExpr(ASTContext& C, SourceLocation lparenloc, 2301 Expr **exprs, unsigned nexprs, 2302 SourceLocation rparenloc) 2303: Expr(ParenListExprClass, QualType(), 2304 hasAnyTypeDependentArguments(exprs, nexprs), 2305 hasAnyValueDependentArguments(exprs, nexprs)), 2306 NumExprs(nexprs), LParenLoc(lparenloc), RParenLoc(rparenloc) { 2307 2308 Exprs = new (C) Stmt*[nexprs]; 2309 for (unsigned i = 0; i != nexprs; ++i) 2310 Exprs[i] = exprs[i]; 2311} 2312 2313//===----------------------------------------------------------------------===// 2314// ExprIterator. 2315//===----------------------------------------------------------------------===// 2316 2317Expr* ExprIterator::operator[](size_t idx) { return cast<Expr>(I[idx]); } 2318Expr* ExprIterator::operator*() const { return cast<Expr>(*I); } 2319Expr* ExprIterator::operator->() const { return cast<Expr>(*I); } 2320const Expr* ConstExprIterator::operator[](size_t idx) const { 2321 return cast<Expr>(I[idx]); 2322} 2323const Expr* ConstExprIterator::operator*() const { return cast<Expr>(*I); } 2324const Expr* ConstExprIterator::operator->() const { return cast<Expr>(*I); } 2325 2326//===----------------------------------------------------------------------===// 2327// Child Iterators for iterating over subexpressions/substatements 2328//===----------------------------------------------------------------------===// 2329 2330// DeclRefExpr 2331Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 2332Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 2333 2334// ObjCIvarRefExpr 2335Stmt::child_iterator ObjCIvarRefExpr::child_begin() { return &Base; } 2336Stmt::child_iterator ObjCIvarRefExpr::child_end() { return &Base+1; } 2337 2338// ObjCPropertyRefExpr 2339Stmt::child_iterator ObjCPropertyRefExpr::child_begin() { return &Base; } 2340Stmt::child_iterator ObjCPropertyRefExpr::child_end() { return &Base+1; } 2341 2342// ObjCImplicitSetterGetterRefExpr 2343Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_begin() { 2344 // If this is accessing a class member, skip that entry. 2345 if (Base) return &Base; 2346 return &Base+1; 2347} 2348Stmt::child_iterator ObjCImplicitSetterGetterRefExpr::child_end() { 2349 return &Base+1; 2350} 2351 2352// ObjCSuperExpr 2353Stmt::child_iterator ObjCSuperExpr::child_begin() { return child_iterator(); } 2354Stmt::child_iterator ObjCSuperExpr::child_end() { return child_iterator(); } 2355 2356// ObjCIsaExpr 2357Stmt::child_iterator ObjCIsaExpr::child_begin() { return &Base; } 2358Stmt::child_iterator ObjCIsaExpr::child_end() { return &Base+1; } 2359 2360// PredefinedExpr 2361Stmt::child_iterator PredefinedExpr::child_begin() { return child_iterator(); } 2362Stmt::child_iterator PredefinedExpr::child_end() { return child_iterator(); } 2363 2364// IntegerLiteral 2365Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 2366Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 2367 2368// CharacterLiteral 2369Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator();} 2370Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 2371 2372// FloatingLiteral 2373Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 2374Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 2375 2376// ImaginaryLiteral 2377Stmt::child_iterator ImaginaryLiteral::child_begin() { return &Val; } 2378Stmt::child_iterator ImaginaryLiteral::child_end() { return &Val+1; } 2379 2380// StringLiteral 2381Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 2382Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 2383 2384// ParenExpr 2385Stmt::child_iterator ParenExpr::child_begin() { return &Val; } 2386Stmt::child_iterator ParenExpr::child_end() { return &Val+1; } 2387 2388// UnaryOperator 2389Stmt::child_iterator UnaryOperator::child_begin() { return &Val; } 2390Stmt::child_iterator UnaryOperator::child_end() { return &Val+1; } 2391 2392// OffsetOfExpr 2393Stmt::child_iterator OffsetOfExpr::child_begin() { 2394 return reinterpret_cast<Stmt **> (reinterpret_cast<OffsetOfNode *> (this + 1) 2395 + NumComps); 2396} 2397Stmt::child_iterator OffsetOfExpr::child_end() { 2398 return child_iterator(&*child_begin() + NumExprs); 2399} 2400 2401// SizeOfAlignOfExpr 2402Stmt::child_iterator SizeOfAlignOfExpr::child_begin() { 2403 // If this is of a type and the type is a VLA type (and not a typedef), the 2404 // size expression of the VLA needs to be treated as an executable expression. 2405 // Why isn't this weirdness documented better in StmtIterator? 2406 if (isArgumentType()) { 2407 if (VariableArrayType* T = dyn_cast<VariableArrayType>( 2408 getArgumentType().getTypePtr())) 2409 return child_iterator(T); 2410 return child_iterator(); 2411 } 2412 return child_iterator(&Argument.Ex); 2413} 2414Stmt::child_iterator SizeOfAlignOfExpr::child_end() { 2415 if (isArgumentType()) 2416 return child_iterator(); 2417 return child_iterator(&Argument.Ex + 1); 2418} 2419 2420// ArraySubscriptExpr 2421Stmt::child_iterator ArraySubscriptExpr::child_begin() { 2422 return &SubExprs[0]; 2423} 2424Stmt::child_iterator ArraySubscriptExpr::child_end() { 2425 return &SubExprs[0]+END_EXPR; 2426} 2427 2428// CallExpr 2429Stmt::child_iterator CallExpr::child_begin() { 2430 return &SubExprs[0]; 2431} 2432Stmt::child_iterator CallExpr::child_end() { 2433 return &SubExprs[0]+NumArgs+ARGS_START; 2434} 2435 2436// MemberExpr 2437Stmt::child_iterator MemberExpr::child_begin() { return &Base; } 2438Stmt::child_iterator MemberExpr::child_end() { return &Base+1; } 2439 2440// ExtVectorElementExpr 2441Stmt::child_iterator ExtVectorElementExpr::child_begin() { return &Base; } 2442Stmt::child_iterator ExtVectorElementExpr::child_end() { return &Base+1; } 2443 2444// CompoundLiteralExpr 2445Stmt::child_iterator CompoundLiteralExpr::child_begin() { return &Init; } 2446Stmt::child_iterator CompoundLiteralExpr::child_end() { return &Init+1; } 2447 2448// CastExpr 2449Stmt::child_iterator CastExpr::child_begin() { return &Op; } 2450Stmt::child_iterator CastExpr::child_end() { return &Op+1; } 2451 2452// BinaryOperator 2453Stmt::child_iterator BinaryOperator::child_begin() { 2454 return &SubExprs[0]; 2455} 2456Stmt::child_iterator BinaryOperator::child_end() { 2457 return &SubExprs[0]+END_EXPR; 2458} 2459 2460// ConditionalOperator 2461Stmt::child_iterator ConditionalOperator::child_begin() { 2462 return &SubExprs[0]; 2463} 2464Stmt::child_iterator ConditionalOperator::child_end() { 2465 return &SubExprs[0]+END_EXPR; 2466} 2467 2468// AddrLabelExpr 2469Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 2470Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 2471 2472// StmtExpr 2473Stmt::child_iterator StmtExpr::child_begin() { return &SubStmt; } 2474Stmt::child_iterator StmtExpr::child_end() { return &SubStmt+1; } 2475 2476// TypesCompatibleExpr 2477Stmt::child_iterator TypesCompatibleExpr::child_begin() { 2478 return child_iterator(); 2479} 2480 2481Stmt::child_iterator TypesCompatibleExpr::child_end() { 2482 return child_iterator(); 2483} 2484 2485// ChooseExpr 2486Stmt::child_iterator ChooseExpr::child_begin() { return &SubExprs[0]; } 2487Stmt::child_iterator ChooseExpr::child_end() { return &SubExprs[0]+END_EXPR; } 2488 2489// GNUNullExpr 2490Stmt::child_iterator GNUNullExpr::child_begin() { return child_iterator(); } 2491Stmt::child_iterator GNUNullExpr::child_end() { return child_iterator(); } 2492 2493// ShuffleVectorExpr 2494Stmt::child_iterator ShuffleVectorExpr::child_begin() { 2495 return &SubExprs[0]; 2496} 2497Stmt::child_iterator ShuffleVectorExpr::child_end() { 2498 return &SubExprs[0]+NumExprs; 2499} 2500 2501// VAArgExpr 2502Stmt::child_iterator VAArgExpr::child_begin() { return &Val; } 2503Stmt::child_iterator VAArgExpr::child_end() { return &Val+1; } 2504 2505// InitListExpr 2506Stmt::child_iterator InitListExpr::child_begin() { 2507 return InitExprs.size() ? &InitExprs[0] : 0; 2508} 2509Stmt::child_iterator InitListExpr::child_end() { 2510 return InitExprs.size() ? &InitExprs[0] + InitExprs.size() : 0; 2511} 2512 2513// DesignatedInitExpr 2514Stmt::child_iterator DesignatedInitExpr::child_begin() { 2515 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2516 Ptr += sizeof(DesignatedInitExpr); 2517 return reinterpret_cast<Stmt**>(reinterpret_cast<void**>(Ptr)); 2518} 2519Stmt::child_iterator DesignatedInitExpr::child_end() { 2520 return child_iterator(&*child_begin() + NumSubExprs); 2521} 2522 2523// ImplicitValueInitExpr 2524Stmt::child_iterator ImplicitValueInitExpr::child_begin() { 2525 return child_iterator(); 2526} 2527 2528Stmt::child_iterator ImplicitValueInitExpr::child_end() { 2529 return child_iterator(); 2530} 2531 2532// ParenListExpr 2533Stmt::child_iterator ParenListExpr::child_begin() { 2534 return &Exprs[0]; 2535} 2536Stmt::child_iterator ParenListExpr::child_end() { 2537 return &Exprs[0]+NumExprs; 2538} 2539 2540// ObjCStringLiteral 2541Stmt::child_iterator ObjCStringLiteral::child_begin() { 2542 return &String; 2543} 2544Stmt::child_iterator ObjCStringLiteral::child_end() { 2545 return &String+1; 2546} 2547 2548// ObjCEncodeExpr 2549Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 2550Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 2551 2552// ObjCSelectorExpr 2553Stmt::child_iterator ObjCSelectorExpr::child_begin() { 2554 return child_iterator(); 2555} 2556Stmt::child_iterator ObjCSelectorExpr::child_end() { 2557 return child_iterator(); 2558} 2559 2560// ObjCProtocolExpr 2561Stmt::child_iterator ObjCProtocolExpr::child_begin() { 2562 return child_iterator(); 2563} 2564Stmt::child_iterator ObjCProtocolExpr::child_end() { 2565 return child_iterator(); 2566} 2567 2568// ObjCMessageExpr 2569Stmt::child_iterator ObjCMessageExpr::child_begin() { 2570 if (getReceiverKind() == Instance) 2571 return reinterpret_cast<Stmt **>(this + 1); 2572 return getArgs(); 2573} 2574Stmt::child_iterator ObjCMessageExpr::child_end() { 2575 return getArgs() + getNumArgs(); 2576} 2577 2578// Blocks 2579Stmt::child_iterator BlockExpr::child_begin() { return child_iterator(); } 2580Stmt::child_iterator BlockExpr::child_end() { return child_iterator(); } 2581 2582Stmt::child_iterator BlockDeclRefExpr::child_begin() { return child_iterator();} 2583Stmt::child_iterator BlockDeclRefExpr::child_end() { return child_iterator(); } 2584