Expr.cpp revision 211f6adf1301a1461015fb6cb08a05f0a35b65f3
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/ASTContext.h" 16#include "clang/AST/StmtVisitor.h" 17#include "clang/Basic/IdentifierTable.h" 18#include "clang/Basic/TargetInfo.h" 19using namespace clang; 20 21//===----------------------------------------------------------------------===// 22// Primary Expressions. 23//===----------------------------------------------------------------------===// 24 25StringLiteral::StringLiteral(const char *strData, unsigned byteLength, 26 bool Wide, QualType t, SourceLocation firstLoc, 27 SourceLocation lastLoc) : 28 Expr(StringLiteralClass, t) { 29 // OPTIMIZE: could allocate this appended to the StringLiteral. 30 char *AStrData = new char[byteLength]; 31 memcpy(AStrData, strData, byteLength); 32 StrData = AStrData; 33 ByteLength = byteLength; 34 IsWide = Wide; 35 firstTokLoc = firstLoc; 36 lastTokLoc = lastLoc; 37} 38 39StringLiteral::~StringLiteral() { 40 delete[] StrData; 41} 42 43bool UnaryOperator::isPostfix(Opcode Op) { 44 switch (Op) { 45 case PostInc: 46 case PostDec: 47 return true; 48 default: 49 return false; 50 } 51} 52 53/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 54/// corresponds to, e.g. "sizeof" or "[pre]++". 55const char *UnaryOperator::getOpcodeStr(Opcode Op) { 56 switch (Op) { 57 default: assert(0 && "Unknown unary operator"); 58 case PostInc: return "++"; 59 case PostDec: return "--"; 60 case PreInc: return "++"; 61 case PreDec: return "--"; 62 case AddrOf: return "&"; 63 case Deref: return "*"; 64 case Plus: return "+"; 65 case Minus: return "-"; 66 case Not: return "~"; 67 case LNot: return "!"; 68 case Real: return "__real"; 69 case Imag: return "__imag"; 70 case SizeOf: return "sizeof"; 71 case AlignOf: return "alignof"; 72 case Extension: return "__extension__"; 73 case OffsetOf: return "__builtin_offsetof"; 74 } 75} 76 77//===----------------------------------------------------------------------===// 78// Postfix Operators. 79//===----------------------------------------------------------------------===// 80 81 82CallExpr::CallExpr(Expr *fn, Expr **args, unsigned numargs, QualType t, 83 SourceLocation rparenloc) 84 : Expr(CallExprClass, t), NumArgs(numargs) { 85 SubExprs = new Expr*[numargs+1]; 86 SubExprs[FN] = fn; 87 for (unsigned i = 0; i != numargs; ++i) 88 SubExprs[i+ARGS_START] = args[i]; 89 RParenLoc = rparenloc; 90} 91 92/// setNumArgs - This changes the number of arguments present in this call. 93/// Any orphaned expressions are deleted by this, and any new operands are set 94/// to null. 95void CallExpr::setNumArgs(unsigned NumArgs) { 96 // No change, just return. 97 if (NumArgs == getNumArgs()) return; 98 99 // If shrinking # arguments, just delete the extras and forgot them. 100 if (NumArgs < getNumArgs()) { 101 for (unsigned i = NumArgs, e = getNumArgs(); i != e; ++i) 102 delete getArg(i); 103 this->NumArgs = NumArgs; 104 return; 105 } 106 107 // Otherwise, we are growing the # arguments. New an bigger argument array. 108 Expr **NewSubExprs = new Expr*[NumArgs+1]; 109 // Copy over args. 110 for (unsigned i = 0; i != getNumArgs()+ARGS_START; ++i) 111 NewSubExprs[i] = SubExprs[i]; 112 // Null out new args. 113 for (unsigned i = getNumArgs()+ARGS_START; i != NumArgs+ARGS_START; ++i) 114 NewSubExprs[i] = 0; 115 116 delete[] SubExprs; 117 SubExprs = NewSubExprs; 118 this->NumArgs = NumArgs; 119} 120 121bool CallExpr::isBuiltinConstantExpr() const { 122 // All simple function calls (e.g. func()) are implicitly cast to pointer to 123 // function. As a result, we try and obtain the DeclRefExpr from the 124 // ImplicitCastExpr. 125 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 126 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 127 return false; 128 129 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 130 if (!DRE) 131 return false; 132 133 const FunctionDecl *FDecl = dyn_cast<FunctionDecl>(DRE->getDecl()); 134 if (!FDecl) 135 return false; 136 137 unsigned builtinID = FDecl->getIdentifier()->getBuiltinID(); 138 if (!builtinID) 139 return false; 140 141 // We have a builtin that is a constant expression 142 return builtinID == Builtin::BI__builtin___CFStringMakeConstantString || 143 builtinID == Builtin::BI__builtin_classify_type; 144} 145 146bool CallExpr::isBuiltinClassifyType(llvm::APSInt &Result) const { 147 // The following enum mimics gcc's internal "typeclass.h" file. 148 enum gcc_type_class { 149 no_type_class = -1, 150 void_type_class, integer_type_class, char_type_class, 151 enumeral_type_class, boolean_type_class, 152 pointer_type_class, reference_type_class, offset_type_class, 153 real_type_class, complex_type_class, 154 function_type_class, method_type_class, 155 record_type_class, union_type_class, 156 array_type_class, string_type_class, 157 lang_type_class 158 }; 159 Result.setIsSigned(true); 160 161 // All simple function calls (e.g. func()) are implicitly cast to pointer to 162 // function. As a result, we try and obtain the DeclRefExpr from the 163 // ImplicitCastExpr. 164 const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(getCallee()); 165 if (!ICE) // FIXME: deal with more complex calls (e.g. (func)(), (*func)()). 166 return false; 167 const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()); 168 if (!DRE) 169 return false; 170 171 // We have a DeclRefExpr. 172 if (strcmp(DRE->getDecl()->getName(), "__builtin_classify_type") == 0) { 173 // If no argument was supplied, default to "no_type_class". This isn't 174 // ideal, however it's what gcc does. 175 Result = static_cast<uint64_t>(no_type_class); 176 if (NumArgs >= 1) { 177 QualType argType = getArg(0)->getType(); 178 179 if (argType->isVoidType()) 180 Result = void_type_class; 181 else if (argType->isEnumeralType()) 182 Result = enumeral_type_class; 183 else if (argType->isBooleanType()) 184 Result = boolean_type_class; 185 else if (argType->isCharType()) 186 Result = string_type_class; // gcc doesn't appear to use char_type_class 187 else if (argType->isIntegerType()) 188 Result = integer_type_class; 189 else if (argType->isPointerType()) 190 Result = pointer_type_class; 191 else if (argType->isReferenceType()) 192 Result = reference_type_class; 193 else if (argType->isRealType()) 194 Result = real_type_class; 195 else if (argType->isComplexType()) 196 Result = complex_type_class; 197 else if (argType->isFunctionType()) 198 Result = function_type_class; 199 else if (argType->isStructureType()) 200 Result = record_type_class; 201 else if (argType->isUnionType()) 202 Result = union_type_class; 203 else if (argType->isArrayType()) 204 Result = array_type_class; 205 else if (argType->isUnionType()) 206 Result = union_type_class; 207 else // FIXME: offset_type_class, method_type_class, & lang_type_class? 208 assert(0 && "CallExpr::isBuiltinClassifyType(): unimplemented type"); 209 } 210 return true; 211 } 212 return false; 213} 214 215/// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 216/// corresponds to, e.g. "<<=". 217const char *BinaryOperator::getOpcodeStr(Opcode Op) { 218 switch (Op) { 219 default: assert(0 && "Unknown binary operator"); 220 case Mul: return "*"; 221 case Div: return "/"; 222 case Rem: return "%"; 223 case Add: return "+"; 224 case Sub: return "-"; 225 case Shl: return "<<"; 226 case Shr: return ">>"; 227 case LT: return "<"; 228 case GT: return ">"; 229 case LE: return "<="; 230 case GE: return ">="; 231 case EQ: return "=="; 232 case NE: return "!="; 233 case And: return "&"; 234 case Xor: return "^"; 235 case Or: return "|"; 236 case LAnd: return "&&"; 237 case LOr: return "||"; 238 case Assign: return "="; 239 case MulAssign: return "*="; 240 case DivAssign: return "/="; 241 case RemAssign: return "%="; 242 case AddAssign: return "+="; 243 case SubAssign: return "-="; 244 case ShlAssign: return "<<="; 245 case ShrAssign: return ">>="; 246 case AndAssign: return "&="; 247 case XorAssign: return "^="; 248 case OrAssign: return "|="; 249 case Comma: return ","; 250 } 251} 252 253InitListExpr::InitListExpr(SourceLocation lbraceloc, 254 Expr **initexprs, unsigned numinits, 255 SourceLocation rbraceloc) 256 : Expr(InitListExprClass, QualType()), 257 LBraceLoc(lbraceloc), RBraceLoc(rbraceloc) 258{ 259 for (unsigned i = 0; i != numinits; i++) 260 InitExprs.push_back(initexprs[i]); 261} 262 263//===----------------------------------------------------------------------===// 264// Generic Expression Routines 265//===----------------------------------------------------------------------===// 266 267/// hasLocalSideEffect - Return true if this immediate expression has side 268/// effects, not counting any sub-expressions. 269bool Expr::hasLocalSideEffect() const { 270 switch (getStmtClass()) { 271 default: 272 return false; 273 case ParenExprClass: 274 return cast<ParenExpr>(this)->getSubExpr()->hasLocalSideEffect(); 275 case UnaryOperatorClass: { 276 const UnaryOperator *UO = cast<UnaryOperator>(this); 277 278 switch (UO->getOpcode()) { 279 default: return false; 280 case UnaryOperator::PostInc: 281 case UnaryOperator::PostDec: 282 case UnaryOperator::PreInc: 283 case UnaryOperator::PreDec: 284 return true; // ++/-- 285 286 case UnaryOperator::Deref: 287 // Dereferencing a volatile pointer is a side-effect. 288 return getType().isVolatileQualified(); 289 case UnaryOperator::Real: 290 case UnaryOperator::Imag: 291 // accessing a piece of a volatile complex is a side-effect. 292 return UO->getSubExpr()->getType().isVolatileQualified(); 293 294 case UnaryOperator::Extension: 295 return UO->getSubExpr()->hasLocalSideEffect(); 296 } 297 } 298 case BinaryOperatorClass: { 299 const BinaryOperator *BinOp = cast<BinaryOperator>(this); 300 // Consider comma to have side effects if the LHS and RHS both do. 301 if (BinOp->getOpcode() == BinaryOperator::Comma) 302 return BinOp->getLHS()->hasLocalSideEffect() && 303 BinOp->getRHS()->hasLocalSideEffect(); 304 305 return BinOp->isAssignmentOp(); 306 } 307 case CompoundAssignOperatorClass: 308 return true; 309 310 case ConditionalOperatorClass: { 311 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 312 return Exp->getCond()->hasLocalSideEffect() 313 || (Exp->getLHS() && Exp->getLHS()->hasLocalSideEffect()) 314 || (Exp->getRHS() && Exp->getRHS()->hasLocalSideEffect()); 315 } 316 317 case MemberExprClass: 318 case ArraySubscriptExprClass: 319 // If the base pointer or element is to a volatile pointer/field, accessing 320 // if is a side effect. 321 return getType().isVolatileQualified(); 322 323 case CallExprClass: 324 // TODO: check attributes for pure/const. "void foo() { strlen("bar"); }" 325 // should warn. 326 return true; 327 case ObjCMessageExprClass: 328 return true; 329 case StmtExprClass: 330 // TODO: check the inside of the statement expression 331 return true; 332 333 case CastExprClass: 334 // If this is a cast to void, check the operand. Otherwise, the result of 335 // the cast is unused. 336 if (getType()->isVoidType()) 337 return cast<CastExpr>(this)->getSubExpr()->hasLocalSideEffect(); 338 return false; 339 340 case ImplicitCastExprClass: 341 // Check the operand, since implicit casts are inserted by Sema 342 return cast<ImplicitCastExpr>(this)->getSubExpr()->hasLocalSideEffect(); 343 344 case CXXDefaultArgExprClass: 345 return cast<CXXDefaultArgExpr>(this)->getExpr()->hasLocalSideEffect(); 346 } 347} 348 349/// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or an 350/// incomplete type other than void. Nonarray expressions that can be lvalues: 351/// - name, where name must be a variable 352/// - e[i] 353/// - (e), where e must be an lvalue 354/// - e.name, where e must be an lvalue 355/// - e->name 356/// - *e, the type of e cannot be a function type 357/// - string-constant 358/// - (__real__ e) and (__imag__ e) where e is an lvalue [GNU extension] 359/// - reference type [C++ [expr]] 360/// 361Expr::isLvalueResult Expr::isLvalue() const { 362 // first, check the type (C99 6.3.2.1) 363 if (TR->isFunctionType()) // from isObjectType() 364 return LV_NotObjectType; 365 366 // Allow qualified void which is an incomplete type other than void (yuck). 367 if (TR->isVoidType() && !TR.getCanonicalType().getCVRQualifiers()) 368 return LV_IncompleteVoidType; 369 370 if (TR->isReferenceType()) // C++ [expr] 371 return LV_Valid; 372 373 // the type looks fine, now check the expression 374 switch (getStmtClass()) { 375 case StringLiteralClass: // C99 6.5.1p4 376 return LV_Valid; 377 case ArraySubscriptExprClass: // C99 6.5.3p4 (e1[e2] == (*((e1)+(e2)))) 378 // For vectors, make sure base is an lvalue (i.e. not a function call). 379 if (cast<ArraySubscriptExpr>(this)->getBase()->getType()->isVectorType()) 380 return cast<ArraySubscriptExpr>(this)->getBase()->isLvalue(); 381 return LV_Valid; 382 case DeclRefExprClass: // C99 6.5.1p2 383 if (isa<VarDecl>(cast<DeclRefExpr>(this)->getDecl())) 384 return LV_Valid; 385 break; 386 case MemberExprClass: { // C99 6.5.2.3p4 387 const MemberExpr *m = cast<MemberExpr>(this); 388 return m->isArrow() ? LV_Valid : m->getBase()->isLvalue(); 389 } 390 case UnaryOperatorClass: 391 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Deref) 392 return LV_Valid; // C99 6.5.3p4 393 394 if (cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Real || 395 cast<UnaryOperator>(this)->getOpcode() == UnaryOperator::Imag) 396 return cast<UnaryOperator>(this)->getSubExpr()->isLvalue(); // GNU. 397 break; 398 case ParenExprClass: // C99 6.5.1p5 399 return cast<ParenExpr>(this)->getSubExpr()->isLvalue(); 400 case CompoundLiteralExprClass: // C99 6.5.2.5p5 401 return LV_Valid; 402 case ExtVectorElementExprClass: 403 if (cast<ExtVectorElementExpr>(this)->containsDuplicateElements()) 404 return LV_DuplicateVectorComponents; 405 return LV_Valid; 406 case ObjCIvarRefExprClass: // ObjC instance variables are lvalues. 407 return LV_Valid; 408 case PreDefinedExprClass: 409 return LV_Valid; 410 case CXXDefaultArgExprClass: 411 return cast<CXXDefaultArgExpr>(this)->getExpr()->isLvalue(); 412 default: 413 break; 414 } 415 return LV_InvalidExpression; 416} 417 418/// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 419/// does not have an incomplete type, does not have a const-qualified type, and 420/// if it is a structure or union, does not have any member (including, 421/// recursively, any member or element of all contained aggregates or unions) 422/// with a const-qualified type. 423Expr::isModifiableLvalueResult Expr::isModifiableLvalue() const { 424 isLvalueResult lvalResult = isLvalue(); 425 426 switch (lvalResult) { 427 case LV_Valid: break; 428 case LV_NotObjectType: return MLV_NotObjectType; 429 case LV_IncompleteVoidType: return MLV_IncompleteVoidType; 430 case LV_DuplicateVectorComponents: return MLV_DuplicateVectorComponents; 431 case LV_InvalidExpression: return MLV_InvalidExpression; 432 } 433 if (TR.isConstQualified()) 434 return MLV_ConstQualified; 435 if (TR->isArrayType()) 436 return MLV_ArrayType; 437 if (TR->isIncompleteType()) 438 return MLV_IncompleteType; 439 440 if (const RecordType *r = dyn_cast<RecordType>(TR.getCanonicalType())) { 441 if (r->hasConstFields()) 442 return MLV_ConstQualified; 443 } 444 return MLV_Valid; 445} 446 447/// hasGlobalStorage - Return true if this expression has static storage 448/// duration. This means that the address of this expression is a link-time 449/// constant. 450bool Expr::hasGlobalStorage() const { 451 switch (getStmtClass()) { 452 default: 453 return false; 454 case ParenExprClass: 455 return cast<ParenExpr>(this)->getSubExpr()->hasGlobalStorage(); 456 case ImplicitCastExprClass: 457 return cast<ImplicitCastExpr>(this)->getSubExpr()->hasGlobalStorage(); 458 case CompoundLiteralExprClass: 459 return cast<CompoundLiteralExpr>(this)->isFileScope(); 460 case DeclRefExprClass: { 461 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 462 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) 463 return VD->hasGlobalStorage(); 464 if (isa<FunctionDecl>(D)) 465 return true; 466 return false; 467 } 468 case MemberExprClass: { 469 const MemberExpr *M = cast<MemberExpr>(this); 470 return !M->isArrow() && M->getBase()->hasGlobalStorage(); 471 } 472 case ArraySubscriptExprClass: 473 return cast<ArraySubscriptExpr>(this)->getBase()->hasGlobalStorage(); 474 case PreDefinedExprClass: 475 return true; 476 case CXXDefaultArgExprClass: 477 return cast<CXXDefaultArgExpr>(this)->getExpr()->hasGlobalStorage(); 478 } 479} 480 481Expr* Expr::IgnoreParens() { 482 Expr* E = this; 483 while (ParenExpr* P = dyn_cast<ParenExpr>(E)) 484 E = P->getSubExpr(); 485 486 return E; 487} 488 489/// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 490/// or CastExprs or ImplicitCastExprs, returning their operand. 491Expr *Expr::IgnoreParenCasts() { 492 Expr *E = this; 493 while (true) { 494 if (ParenExpr *P = dyn_cast<ParenExpr>(E)) 495 E = P->getSubExpr(); 496 else if (CastExpr *P = dyn_cast<CastExpr>(E)) 497 E = P->getSubExpr(); 498 else if (ImplicitCastExpr *P = dyn_cast<ImplicitCastExpr>(E)) 499 E = P->getSubExpr(); 500 else 501 return E; 502 } 503} 504 505 506bool Expr::isConstantExpr(ASTContext &Ctx, SourceLocation *Loc) const { 507 switch (getStmtClass()) { 508 default: 509 if (Loc) *Loc = getLocStart(); 510 return false; 511 case ParenExprClass: 512 return cast<ParenExpr>(this)->getSubExpr()->isConstantExpr(Ctx, Loc); 513 case StringLiteralClass: 514 case ObjCStringLiteralClass: 515 case FloatingLiteralClass: 516 case IntegerLiteralClass: 517 case CharacterLiteralClass: 518 case ImaginaryLiteralClass: 519 case TypesCompatibleExprClass: 520 case CXXBoolLiteralExprClass: 521 return true; 522 case CallExprClass: { 523 const CallExpr *CE = cast<CallExpr>(this); 524 if (CE->isBuiltinConstantExpr()) 525 return true; 526 if (Loc) *Loc = getLocStart(); 527 return false; 528 } 529 case DeclRefExprClass: { 530 const Decl *D = cast<DeclRefExpr>(this)->getDecl(); 531 // Accept address of function. 532 if (isa<EnumConstantDecl>(D) || isa<FunctionDecl>(D)) 533 return true; 534 if (Loc) *Loc = getLocStart(); 535 if (isa<VarDecl>(D)) 536 return TR->isArrayType(); 537 return false; 538 } 539 case CompoundLiteralExprClass: 540 if (Loc) *Loc = getLocStart(); 541 // Allow "(int []){2,4}", since the array will be converted to a pointer. 542 // Allow "(vector type){2,4}" since the elements are all constant. 543 return TR->isArrayType() || TR->isVectorType(); 544 case UnaryOperatorClass: { 545 const UnaryOperator *Exp = cast<UnaryOperator>(this); 546 547 // C99 6.6p9 548 if (Exp->getOpcode() == UnaryOperator::AddrOf) { 549 if (!Exp->getSubExpr()->hasGlobalStorage()) { 550 if (Loc) *Loc = getLocStart(); 551 return false; 552 } 553 return true; 554 } 555 556 // Get the operand value. If this is sizeof/alignof, do not evalute the 557 // operand. This affects C99 6.6p3. 558 if (!Exp->isSizeOfAlignOfOp() && 559 Exp->getOpcode() != UnaryOperator::OffsetOf && 560 !Exp->getSubExpr()->isConstantExpr(Ctx, Loc)) 561 return false; 562 563 switch (Exp->getOpcode()) { 564 // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 565 // See C99 6.6p3. 566 default: 567 if (Loc) *Loc = Exp->getOperatorLoc(); 568 return false; 569 case UnaryOperator::Extension: 570 return true; // FIXME: this is wrong. 571 case UnaryOperator::SizeOf: 572 case UnaryOperator::AlignOf: 573 case UnaryOperator::OffsetOf: 574 // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 575 if (!Exp->getSubExpr()->getType()->isConstantSizeType()) { 576 if (Loc) *Loc = Exp->getOperatorLoc(); 577 return false; 578 } 579 return true; 580 case UnaryOperator::LNot: 581 case UnaryOperator::Plus: 582 case UnaryOperator::Minus: 583 case UnaryOperator::Not: 584 return true; 585 } 586 } 587 case SizeOfAlignOfTypeExprClass: { 588 const SizeOfAlignOfTypeExpr *Exp = cast<SizeOfAlignOfTypeExpr>(this); 589 // alignof always evaluates to a constant. 590 if (Exp->isSizeOf() && !Exp->getArgumentType()->isVoidType() && 591 !Exp->getArgumentType()->isConstantSizeType()) { 592 if (Loc) *Loc = Exp->getOperatorLoc(); 593 return false; 594 } 595 return true; 596 } 597 case BinaryOperatorClass: { 598 const BinaryOperator *Exp = cast<BinaryOperator>(this); 599 600 // The LHS of a constant expr is always evaluated and needed. 601 if (!Exp->getLHS()->isConstantExpr(Ctx, Loc)) 602 return false; 603 604 if (!Exp->getRHS()->isConstantExpr(Ctx, Loc)) 605 return false; 606 return true; 607 } 608 case ImplicitCastExprClass: 609 case CastExprClass: { 610 const Expr *SubExpr; 611 SourceLocation CastLoc; 612 if (const CastExpr *C = dyn_cast<CastExpr>(this)) { 613 SubExpr = C->getSubExpr(); 614 CastLoc = C->getLParenLoc(); 615 } else { 616 SubExpr = cast<ImplicitCastExpr>(this)->getSubExpr(); 617 CastLoc = getLocStart(); 618 } 619 if (!SubExpr->isConstantExpr(Ctx, Loc)) { 620 if (Loc) *Loc = SubExpr->getLocStart(); 621 return false; 622 } 623 return true; 624 } 625 case ConditionalOperatorClass: { 626 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 627 if (!Exp->getCond()->isConstantExpr(Ctx, Loc) || 628 // Handle the GNU extension for missing LHS. 629 !(Exp->getLHS() && Exp->getLHS()->isConstantExpr(Ctx, Loc)) || 630 !Exp->getRHS()->isConstantExpr(Ctx, Loc)) 631 return false; 632 return true; 633 } 634 case InitListExprClass: { 635 const InitListExpr *Exp = cast<InitListExpr>(this); 636 unsigned numInits = Exp->getNumInits(); 637 for (unsigned i = 0; i < numInits; i++) { 638 if (!Exp->getInit(i)->isConstantExpr(Ctx, Loc)) { 639 if (Loc) *Loc = Exp->getInit(i)->getLocStart(); 640 return false; 641 } 642 } 643 return true; 644 } 645 case CXXDefaultArgExprClass: 646 return cast<CXXDefaultArgExpr>(this)->getExpr()->isConstantExpr(Ctx, Loc); 647 } 648} 649 650/// isIntegerConstantExpr - this recursive routine will test if an expression is 651/// an integer constant expression. Note: With the introduction of VLA's in 652/// C99 the result of the sizeof operator is no longer always a constant 653/// expression. The generalization of the wording to include any subexpression 654/// that is not evaluated (C99 6.6p3) means that nonconstant subexpressions 655/// can appear as operands to other operators (e.g. &&, ||, ?:). For instance, 656/// "0 || f()" can be treated as a constant expression. In C90 this expression, 657/// occurring in a context requiring a constant, would have been a constraint 658/// violation. FIXME: This routine currently implements C90 semantics. 659/// To properly implement C99 semantics this routine will need to evaluate 660/// expressions involving operators previously mentioned. 661 662/// FIXME: Pass up a reason why! Invalid operation in i-c-e, division by zero, 663/// comma, etc 664/// 665/// FIXME: This should ext-warn on overflow during evaluation! ISO C does not 666/// permit this. This includes things like (int)1e1000 667/// 668/// FIXME: Handle offsetof. Two things to do: Handle GCC's __builtin_offsetof 669/// to support gcc 4.0+ and handle the idiom GCC recognizes with a null pointer 670/// cast+dereference. 671bool Expr::isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 672 SourceLocation *Loc, bool isEvaluated) const { 673 switch (getStmtClass()) { 674 default: 675 if (Loc) *Loc = getLocStart(); 676 return false; 677 case ParenExprClass: 678 return cast<ParenExpr>(this)->getSubExpr()-> 679 isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated); 680 case IntegerLiteralClass: 681 Result = cast<IntegerLiteral>(this)->getValue(); 682 break; 683 case CharacterLiteralClass: { 684 const CharacterLiteral *CL = cast<CharacterLiteral>(this); 685 Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); 686 Result = CL->getValue(); 687 Result.setIsUnsigned(!getType()->isSignedIntegerType()); 688 break; 689 } 690 case TypesCompatibleExprClass: { 691 const TypesCompatibleExpr *TCE = cast<TypesCompatibleExpr>(this); 692 Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); 693 Result = Ctx.typesAreCompatible(TCE->getArgType1(), TCE->getArgType2()); 694 break; 695 } 696 case CallExprClass: { 697 const CallExpr *CE = cast<CallExpr>(this); 698 Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); 699 if (CE->isBuiltinClassifyType(Result)) 700 break; 701 if (Loc) *Loc = getLocStart(); 702 return false; 703 } 704 case DeclRefExprClass: 705 if (const EnumConstantDecl *D = 706 dyn_cast<EnumConstantDecl>(cast<DeclRefExpr>(this)->getDecl())) { 707 Result = D->getInitVal(); 708 break; 709 } 710 if (Loc) *Loc = getLocStart(); 711 return false; 712 case UnaryOperatorClass: { 713 const UnaryOperator *Exp = cast<UnaryOperator>(this); 714 715 // Get the operand value. If this is sizeof/alignof, do not evalute the 716 // operand. This affects C99 6.6p3. 717 if (!Exp->isSizeOfAlignOfOp() && !Exp->isOffsetOfOp() && 718 !Exp->getSubExpr()->isIntegerConstantExpr(Result, Ctx, Loc,isEvaluated)) 719 return false; 720 721 switch (Exp->getOpcode()) { 722 // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 723 // See C99 6.6p3. 724 default: 725 if (Loc) *Loc = Exp->getOperatorLoc(); 726 return false; 727 case UnaryOperator::Extension: 728 return true; // FIXME: this is wrong. 729 case UnaryOperator::SizeOf: 730 case UnaryOperator::AlignOf: 731 // Return the result in the right width. 732 Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); 733 734 // sizeof(void) and __alignof__(void) = 1 as a gcc extension. 735 if (Exp->getSubExpr()->getType()->isVoidType()) { 736 Result = 1; 737 break; 738 } 739 740 // sizeof(vla) is not a constantexpr: C99 6.5.3.4p2. 741 if (!Exp->getSubExpr()->getType()->isConstantSizeType()) { 742 if (Loc) *Loc = Exp->getOperatorLoc(); 743 return false; 744 } 745 746 // Get information about the size or align. 747 if (Exp->getSubExpr()->getType()->isFunctionType()) { 748 // GCC extension: sizeof(function) = 1. 749 Result = Exp->getOpcode() == UnaryOperator::AlignOf ? 4 : 1; 750 } else { 751 unsigned CharSize = Ctx.Target.getCharWidth(); 752 if (Exp->getOpcode() == UnaryOperator::AlignOf) 753 Result = Ctx.getTypeAlign(Exp->getSubExpr()->getType()) / CharSize; 754 else 755 Result = Ctx.getTypeSize(Exp->getSubExpr()->getType()) / CharSize; 756 } 757 break; 758 case UnaryOperator::LNot: { 759 bool Val = Result == 0; 760 Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); 761 Result = Val; 762 break; 763 } 764 case UnaryOperator::Plus: 765 break; 766 case UnaryOperator::Minus: 767 Result = -Result; 768 break; 769 case UnaryOperator::Not: 770 Result = ~Result; 771 break; 772 case UnaryOperator::OffsetOf: 773 Result = Exp->evaluateOffsetOf(Ctx); 774 } 775 break; 776 } 777 case SizeOfAlignOfTypeExprClass: { 778 const SizeOfAlignOfTypeExpr *Exp = cast<SizeOfAlignOfTypeExpr>(this); 779 780 // Return the result in the right width. 781 Result.zextOrTrunc(static_cast<uint32_t>(Ctx.getTypeSize(getType()))); 782 783 // sizeof(void) and __alignof__(void) = 1 as a gcc extension. 784 if (Exp->getArgumentType()->isVoidType()) { 785 Result = 1; 786 break; 787 } 788 789 // alignof always evaluates to a constant, sizeof does if arg is not VLA. 790 if (Exp->isSizeOf() && !Exp->getArgumentType()->isConstantSizeType()) { 791 if (Loc) *Loc = Exp->getOperatorLoc(); 792 return false; 793 } 794 795 // Get information about the size or align. 796 if (Exp->getArgumentType()->isFunctionType()) { 797 // GCC extension: sizeof(function) = 1. 798 Result = Exp->isSizeOf() ? 1 : 4; 799 } else { 800 unsigned CharSize = Ctx.Target.getCharWidth(); 801 if (Exp->isSizeOf()) 802 Result = Ctx.getTypeSize(Exp->getArgumentType()) / CharSize; 803 else 804 Result = Ctx.getTypeAlign(Exp->getArgumentType()) / CharSize; 805 } 806 break; 807 } 808 case BinaryOperatorClass: { 809 const BinaryOperator *Exp = cast<BinaryOperator>(this); 810 811 // The LHS of a constant expr is always evaluated and needed. 812 if (!Exp->getLHS()->isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated)) 813 return false; 814 815 llvm::APSInt RHS(Result); 816 817 // The short-circuiting &&/|| operators don't necessarily evaluate their 818 // RHS. Make sure to pass isEvaluated down correctly. 819 if (Exp->isLogicalOp()) { 820 bool RHSEval; 821 if (Exp->getOpcode() == BinaryOperator::LAnd) 822 RHSEval = Result != 0; 823 else { 824 assert(Exp->getOpcode() == BinaryOperator::LOr &&"Unexpected logical"); 825 RHSEval = Result == 0; 826 } 827 828 if (!Exp->getRHS()->isIntegerConstantExpr(RHS, Ctx, Loc, 829 isEvaluated & RHSEval)) 830 return false; 831 } else { 832 if (!Exp->getRHS()->isIntegerConstantExpr(RHS, Ctx, Loc, isEvaluated)) 833 return false; 834 } 835 836 switch (Exp->getOpcode()) { 837 default: 838 if (Loc) *Loc = getLocStart(); 839 return false; 840 case BinaryOperator::Mul: 841 Result *= RHS; 842 break; 843 case BinaryOperator::Div: 844 if (RHS == 0) { 845 if (!isEvaluated) break; 846 if (Loc) *Loc = getLocStart(); 847 return false; 848 } 849 Result /= RHS; 850 break; 851 case BinaryOperator::Rem: 852 if (RHS == 0) { 853 if (!isEvaluated) break; 854 if (Loc) *Loc = getLocStart(); 855 return false; 856 } 857 Result %= RHS; 858 break; 859 case BinaryOperator::Add: Result += RHS; break; 860 case BinaryOperator::Sub: Result -= RHS; break; 861 case BinaryOperator::Shl: 862 Result <<= 863 static_cast<uint32_t>(RHS.getLimitedValue(Result.getBitWidth()-1)); 864 break; 865 case BinaryOperator::Shr: 866 Result >>= 867 static_cast<uint32_t>(RHS.getLimitedValue(Result.getBitWidth()-1)); 868 break; 869 case BinaryOperator::LT: Result = Result < RHS; break; 870 case BinaryOperator::GT: Result = Result > RHS; break; 871 case BinaryOperator::LE: Result = Result <= RHS; break; 872 case BinaryOperator::GE: Result = Result >= RHS; break; 873 case BinaryOperator::EQ: Result = Result == RHS; break; 874 case BinaryOperator::NE: Result = Result != RHS; break; 875 case BinaryOperator::And: Result &= RHS; break; 876 case BinaryOperator::Xor: Result ^= RHS; break; 877 case BinaryOperator::Or: Result |= RHS; break; 878 case BinaryOperator::LAnd: 879 Result = Result != 0 && RHS != 0; 880 break; 881 case BinaryOperator::LOr: 882 Result = Result != 0 || RHS != 0; 883 break; 884 885 case BinaryOperator::Comma: 886 // C99 6.6p3: "shall not contain assignment, ..., or comma operators, 887 // *except* when they are contained within a subexpression that is not 888 // evaluated". Note that Assignment can never happen due to constraints 889 // on the LHS subexpr, so we don't need to check it here. 890 if (isEvaluated) { 891 if (Loc) *Loc = getLocStart(); 892 return false; 893 } 894 895 // The result of the constant expr is the RHS. 896 Result = RHS; 897 return true; 898 } 899 900 assert(!Exp->isAssignmentOp() && "LHS can't be a constant expr!"); 901 break; 902 } 903 case ImplicitCastExprClass: 904 case CastExprClass: { 905 const Expr *SubExpr; 906 SourceLocation CastLoc; 907 if (const CastExpr *C = dyn_cast<CastExpr>(this)) { 908 SubExpr = C->getSubExpr(); 909 CastLoc = C->getLParenLoc(); 910 } else { 911 SubExpr = cast<ImplicitCastExpr>(this)->getSubExpr(); 912 CastLoc = getLocStart(); 913 } 914 915 // C99 6.6p6: shall only convert arithmetic types to integer types. 916 if (!SubExpr->getType()->isArithmeticType() || 917 !getType()->isIntegerType()) { 918 if (Loc) *Loc = SubExpr->getLocStart(); 919 return false; 920 } 921 922 uint32_t DestWidth = static_cast<uint32_t>(Ctx.getTypeSize(getType())); 923 924 // Handle simple integer->integer casts. 925 if (SubExpr->getType()->isIntegerType()) { 926 if (!SubExpr->isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated)) 927 return false; 928 929 // Figure out if this is a truncate, extend or noop cast. 930 // If the input is signed, do a sign extend, noop, or truncate. 931 if (getType()->isBooleanType()) { 932 // Conversion to bool compares against zero. 933 Result = Result != 0; 934 Result.zextOrTrunc(DestWidth); 935 } else if (SubExpr->getType()->isSignedIntegerType()) 936 Result.sextOrTrunc(DestWidth); 937 else // If the input is unsigned, do a zero extend, noop, or truncate. 938 Result.zextOrTrunc(DestWidth); 939 break; 940 } 941 942 // Allow floating constants that are the immediate operands of casts or that 943 // are parenthesized. 944 const Expr *Operand = SubExpr; 945 while (const ParenExpr *PE = dyn_cast<ParenExpr>(Operand)) 946 Operand = PE->getSubExpr(); 947 948 // If this isn't a floating literal, we can't handle it. 949 const FloatingLiteral *FL = dyn_cast<FloatingLiteral>(Operand); 950 if (!FL) { 951 if (Loc) *Loc = Operand->getLocStart(); 952 return false; 953 } 954 955 // If the destination is boolean, compare against zero. 956 if (getType()->isBooleanType()) { 957 Result = !FL->getValue().isZero(); 958 Result.zextOrTrunc(DestWidth); 959 break; 960 } 961 962 // Determine whether we are converting to unsigned or signed. 963 bool DestSigned = getType()->isSignedIntegerType(); 964 965 // TODO: Warn on overflow, but probably not here: isIntegerConstantExpr can 966 // be called multiple times per AST. 967 uint64_t Space[4]; 968 (void)FL->getValue().convertToInteger(Space, DestWidth, DestSigned, 969 llvm::APFloat::rmTowardZero); 970 Result = llvm::APInt(DestWidth, 4, Space); 971 break; 972 } 973 case ConditionalOperatorClass: { 974 const ConditionalOperator *Exp = cast<ConditionalOperator>(this); 975 976 if (!Exp->getCond()->isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated)) 977 return false; 978 979 const Expr *TrueExp = Exp->getLHS(); 980 const Expr *FalseExp = Exp->getRHS(); 981 if (Result == 0) std::swap(TrueExp, FalseExp); 982 983 // Evaluate the false one first, discard the result. 984 if (FalseExp && !FalseExp->isIntegerConstantExpr(Result, Ctx, Loc, false)) 985 return false; 986 // Evalute the true one, capture the result. 987 if (TrueExp && 988 !TrueExp->isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated)) 989 return false; 990 break; 991 } 992 case CXXDefaultArgExprClass: 993 return cast<CXXDefaultArgExpr>(this) 994 ->isIntegerConstantExpr(Result, Ctx, Loc, isEvaluated); 995 } 996 997 // Cases that are valid constant exprs fall through to here. 998 Result.setIsUnsigned(getType()->isUnsignedIntegerType()); 999 return true; 1000} 1001 1002/// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 1003/// integer constant expression with the value zero, or if this is one that is 1004/// cast to void*. 1005bool Expr::isNullPointerConstant(ASTContext &Ctx) const { 1006 // Strip off a cast to void*, if it exists. 1007 if (const CastExpr *CE = dyn_cast<CastExpr>(this)) { 1008 // Check that it is a cast to void*. 1009 if (const PointerType *PT = CE->getType()->getAsPointerType()) { 1010 QualType Pointee = PT->getPointeeType(); 1011 if (Pointee.getCVRQualifiers() == 0 && 1012 Pointee->isVoidType() && // to void* 1013 CE->getSubExpr()->getType()->isIntegerType()) // from int. 1014 return CE->getSubExpr()->isNullPointerConstant(Ctx); 1015 } 1016 } else if (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(this)) { 1017 // Ignore the ImplicitCastExpr type entirely. 1018 return ICE->getSubExpr()->isNullPointerConstant(Ctx); 1019 } else if (const ParenExpr *PE = dyn_cast<ParenExpr>(this)) { 1020 // Accept ((void*)0) as a null pointer constant, as many other 1021 // implementations do. 1022 return PE->getSubExpr()->isNullPointerConstant(Ctx); 1023 } else if (const CXXDefaultArgExpr *DefaultArg 1024 = dyn_cast<CXXDefaultArgExpr>(this)) { 1025 // See through default argument expressions 1026 return DefaultArg->getExpr()->isNullPointerConstant(Ctx); 1027 } 1028 1029 // This expression must be an integer type. 1030 if (!getType()->isIntegerType()) 1031 return false; 1032 1033 // If we have an integer constant expression, we need to *evaluate* it and 1034 // test for the value 0. 1035 llvm::APSInt Val(32); 1036 return isIntegerConstantExpr(Val, Ctx, 0, true) && Val == 0; 1037} 1038 1039unsigned ExtVectorElementExpr::getNumElements() const { 1040 if (const VectorType *VT = getType()->getAsVectorType()) 1041 return VT->getNumElements(); 1042 return 1; 1043} 1044 1045/// containsDuplicateElements - Return true if any element access is repeated. 1046bool ExtVectorElementExpr::containsDuplicateElements() const { 1047 const char *compStr = Accessor.getName(); 1048 unsigned length = strlen(compStr); 1049 1050 for (unsigned i = 0; i < length-1; i++) { 1051 const char *s = compStr+i; 1052 for (const char c = *s++; *s; s++) 1053 if (c == *s) 1054 return true; 1055 } 1056 return false; 1057} 1058 1059/// getEncodedElementAccess - We encode the fields as a llvm ConstantArray. 1060void ExtVectorElementExpr::getEncodedElementAccess( 1061 llvm::SmallVectorImpl<unsigned> &Elts) const { 1062 const char *compStr = Accessor.getName(); 1063 1064 bool isHi = !strcmp(compStr, "hi"); 1065 bool isLo = !strcmp(compStr, "lo"); 1066 bool isEven = !strcmp(compStr, "e"); 1067 bool isOdd = !strcmp(compStr, "o"); 1068 1069 for (unsigned i = 0, e = getNumElements(); i != e; ++i) { 1070 uint64_t Index; 1071 1072 if (isHi) 1073 Index = e + i; 1074 else if (isLo) 1075 Index = i; 1076 else if (isEven) 1077 Index = 2 * i; 1078 else if (isOdd) 1079 Index = 2 * i + 1; 1080 else 1081 Index = ExtVectorType::getAccessorIdx(compStr[i]); 1082 1083 Elts.push_back(Index); 1084 } 1085} 1086 1087// constructor for instance messages. 1088ObjCMessageExpr::ObjCMessageExpr(Expr *receiver, Selector selInfo, 1089 QualType retType, ObjCMethodDecl *mproto, 1090 SourceLocation LBrac, SourceLocation RBrac, 1091 Expr **ArgExprs, unsigned nargs) 1092 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1093 MethodProto(mproto) { 1094 NumArgs = nargs; 1095 SubExprs = new Expr*[NumArgs+1]; 1096 SubExprs[RECEIVER] = receiver; 1097 if (NumArgs) { 1098 for (unsigned i = 0; i != NumArgs; ++i) 1099 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1100 } 1101 LBracloc = LBrac; 1102 RBracloc = RBrac; 1103} 1104 1105// constructor for class messages. 1106// FIXME: clsName should be typed to ObjCInterfaceType 1107ObjCMessageExpr::ObjCMessageExpr(IdentifierInfo *clsName, Selector selInfo, 1108 QualType retType, ObjCMethodDecl *mproto, 1109 SourceLocation LBrac, SourceLocation RBrac, 1110 Expr **ArgExprs, unsigned nargs) 1111 : Expr(ObjCMessageExprClass, retType), SelName(selInfo), 1112 MethodProto(mproto) { 1113 NumArgs = nargs; 1114 SubExprs = new Expr*[NumArgs+1]; 1115 SubExprs[RECEIVER] = (Expr*) ((uintptr_t) clsName | 0x1); 1116 if (NumArgs) { 1117 for (unsigned i = 0; i != NumArgs; ++i) 1118 SubExprs[i+ARGS_START] = static_cast<Expr *>(ArgExprs[i]); 1119 } 1120 LBracloc = LBrac; 1121 RBracloc = RBrac; 1122} 1123 1124bool ChooseExpr::isConditionTrue(ASTContext &C) const { 1125 llvm::APSInt CondVal(32); 1126 bool IsConst = getCond()->isIntegerConstantExpr(CondVal, C); 1127 assert(IsConst && "Condition of choose expr must be i-c-e"); IsConst=IsConst; 1128 return CondVal != 0; 1129} 1130 1131static int64_t evaluateOffsetOf(ASTContext& C, const Expr *E) 1132{ 1133 if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1134 QualType Ty = ME->getBase()->getType(); 1135 1136 RecordDecl *RD = Ty->getAsRecordType()->getDecl(); 1137 const ASTRecordLayout &RL = C.getASTRecordLayout(RD); 1138 FieldDecl *FD = ME->getMemberDecl(); 1139 1140 // FIXME: This is linear time. 1141 unsigned i = 0, e = 0; 1142 for (i = 0, e = RD->getNumMembers(); i != e; i++) { 1143 if (RD->getMember(i) == FD) 1144 break; 1145 } 1146 1147 return RL.getFieldOffset(i) + evaluateOffsetOf(C, ME->getBase()); 1148 } else if (const ArraySubscriptExpr *ASE = dyn_cast<ArraySubscriptExpr>(E)) { 1149 const Expr *Base = ASE->getBase(); 1150 llvm::APSInt Idx(32); 1151 bool ICE = ASE->getIdx()->isIntegerConstantExpr(Idx, C); 1152 assert(ICE && "Array index is not a constant integer!"); 1153 1154 int64_t size = C.getTypeSize(ASE->getType()); 1155 size *= Idx.getSExtValue(); 1156 1157 return size + evaluateOffsetOf(C, Base); 1158 } else if (isa<CompoundLiteralExpr>(E)) 1159 return 0; 1160 1161 assert(0 && "Unknown offsetof subexpression!"); 1162 return 0; 1163} 1164 1165int64_t UnaryOperator::evaluateOffsetOf(ASTContext& C) const 1166{ 1167 assert(Opc == OffsetOf && "Unary operator not offsetof!"); 1168 1169 unsigned CharSize = C.Target.getCharWidth(); 1170 return ::evaluateOffsetOf(C, Val) / CharSize; 1171} 1172 1173//===----------------------------------------------------------------------===// 1174// Child Iterators for iterating over subexpressions/substatements 1175//===----------------------------------------------------------------------===// 1176 1177// DeclRefExpr 1178Stmt::child_iterator DeclRefExpr::child_begin() { return child_iterator(); } 1179Stmt::child_iterator DeclRefExpr::child_end() { return child_iterator(); } 1180 1181// ObjCIvarRefExpr 1182Stmt::child_iterator ObjCIvarRefExpr::child_begin() { 1183 return reinterpret_cast<Stmt**>(&Base); 1184} 1185 1186Stmt::child_iterator ObjCIvarRefExpr::child_end() { 1187 return reinterpret_cast<Stmt**>(&Base)+1; 1188} 1189 1190// PreDefinedExpr 1191Stmt::child_iterator PreDefinedExpr::child_begin() { return child_iterator(); } 1192Stmt::child_iterator PreDefinedExpr::child_end() { return child_iterator(); } 1193 1194// IntegerLiteral 1195Stmt::child_iterator IntegerLiteral::child_begin() { return child_iterator(); } 1196Stmt::child_iterator IntegerLiteral::child_end() { return child_iterator(); } 1197 1198// CharacterLiteral 1199Stmt::child_iterator CharacterLiteral::child_begin() { return child_iterator(); } 1200Stmt::child_iterator CharacterLiteral::child_end() { return child_iterator(); } 1201 1202// FloatingLiteral 1203Stmt::child_iterator FloatingLiteral::child_begin() { return child_iterator(); } 1204Stmt::child_iterator FloatingLiteral::child_end() { return child_iterator(); } 1205 1206// ImaginaryLiteral 1207Stmt::child_iterator ImaginaryLiteral::child_begin() { 1208 return reinterpret_cast<Stmt**>(&Val); 1209} 1210Stmt::child_iterator ImaginaryLiteral::child_end() { 1211 return reinterpret_cast<Stmt**>(&Val)+1; 1212} 1213 1214// StringLiteral 1215Stmt::child_iterator StringLiteral::child_begin() { return child_iterator(); } 1216Stmt::child_iterator StringLiteral::child_end() { return child_iterator(); } 1217 1218// ParenExpr 1219Stmt::child_iterator ParenExpr::child_begin() { 1220 return reinterpret_cast<Stmt**>(&Val); 1221} 1222Stmt::child_iterator ParenExpr::child_end() { 1223 return reinterpret_cast<Stmt**>(&Val)+1; 1224} 1225 1226// UnaryOperator 1227Stmt::child_iterator UnaryOperator::child_begin() { 1228 return reinterpret_cast<Stmt**>(&Val); 1229} 1230Stmt::child_iterator UnaryOperator::child_end() { 1231 return reinterpret_cast<Stmt**>(&Val+1); 1232} 1233 1234// SizeOfAlignOfTypeExpr 1235Stmt::child_iterator SizeOfAlignOfTypeExpr::child_begin() { 1236 // If the type is a VLA type (and not a typedef), the size expression of the 1237 // VLA needs to be treated as an executable expression. 1238 if (VariableArrayType* T = dyn_cast<VariableArrayType>(Ty.getTypePtr())) 1239 return child_iterator(T); 1240 else 1241 return child_iterator(); 1242} 1243Stmt::child_iterator SizeOfAlignOfTypeExpr::child_end() { 1244 return child_iterator(); 1245} 1246 1247// ArraySubscriptExpr 1248Stmt::child_iterator ArraySubscriptExpr::child_begin() { 1249 return reinterpret_cast<Stmt**>(&SubExprs); 1250} 1251Stmt::child_iterator ArraySubscriptExpr::child_end() { 1252 return reinterpret_cast<Stmt**>(&SubExprs)+END_EXPR; 1253} 1254 1255// CallExpr 1256Stmt::child_iterator CallExpr::child_begin() { 1257 return reinterpret_cast<Stmt**>(&SubExprs[0]); 1258} 1259Stmt::child_iterator CallExpr::child_end() { 1260 return reinterpret_cast<Stmt**>(&SubExprs[NumArgs+ARGS_START]); 1261} 1262 1263// MemberExpr 1264Stmt::child_iterator MemberExpr::child_begin() { 1265 return reinterpret_cast<Stmt**>(&Base); 1266} 1267Stmt::child_iterator MemberExpr::child_end() { 1268 return reinterpret_cast<Stmt**>(&Base)+1; 1269} 1270 1271// ExtVectorElementExpr 1272Stmt::child_iterator ExtVectorElementExpr::child_begin() { 1273 return reinterpret_cast<Stmt**>(&Base); 1274} 1275Stmt::child_iterator ExtVectorElementExpr::child_end() { 1276 return reinterpret_cast<Stmt**>(&Base)+1; 1277} 1278 1279// CompoundLiteralExpr 1280Stmt::child_iterator CompoundLiteralExpr::child_begin() { 1281 return reinterpret_cast<Stmt**>(&Init); 1282} 1283Stmt::child_iterator CompoundLiteralExpr::child_end() { 1284 return reinterpret_cast<Stmt**>(&Init)+1; 1285} 1286 1287// ImplicitCastExpr 1288Stmt::child_iterator ImplicitCastExpr::child_begin() { 1289 return reinterpret_cast<Stmt**>(&Op); 1290} 1291Stmt::child_iterator ImplicitCastExpr::child_end() { 1292 return reinterpret_cast<Stmt**>(&Op)+1; 1293} 1294 1295// CastExpr 1296Stmt::child_iterator CastExpr::child_begin() { 1297 return reinterpret_cast<Stmt**>(&Op); 1298} 1299Stmt::child_iterator CastExpr::child_end() { 1300 return reinterpret_cast<Stmt**>(&Op)+1; 1301} 1302 1303// BinaryOperator 1304Stmt::child_iterator BinaryOperator::child_begin() { 1305 return reinterpret_cast<Stmt**>(&SubExprs); 1306} 1307Stmt::child_iterator BinaryOperator::child_end() { 1308 return reinterpret_cast<Stmt**>(&SubExprs)+END_EXPR; 1309} 1310 1311// ConditionalOperator 1312Stmt::child_iterator ConditionalOperator::child_begin() { 1313 return reinterpret_cast<Stmt**>(&SubExprs); 1314} 1315Stmt::child_iterator ConditionalOperator::child_end() { 1316 return reinterpret_cast<Stmt**>(&SubExprs)+END_EXPR; 1317} 1318 1319// AddrLabelExpr 1320Stmt::child_iterator AddrLabelExpr::child_begin() { return child_iterator(); } 1321Stmt::child_iterator AddrLabelExpr::child_end() { return child_iterator(); } 1322 1323// StmtExpr 1324Stmt::child_iterator StmtExpr::child_begin() { 1325 return reinterpret_cast<Stmt**>(&SubStmt); 1326} 1327Stmt::child_iterator StmtExpr::child_end() { 1328 return reinterpret_cast<Stmt**>(&SubStmt)+1; 1329} 1330 1331// TypesCompatibleExpr 1332Stmt::child_iterator TypesCompatibleExpr::child_begin() { 1333 return child_iterator(); 1334} 1335 1336Stmt::child_iterator TypesCompatibleExpr::child_end() { 1337 return child_iterator(); 1338} 1339 1340// ChooseExpr 1341Stmt::child_iterator ChooseExpr::child_begin() { 1342 return reinterpret_cast<Stmt**>(&SubExprs); 1343} 1344 1345Stmt::child_iterator ChooseExpr::child_end() { 1346 return reinterpret_cast<Stmt**>(&SubExprs)+END_EXPR; 1347} 1348 1349// OverloadExpr 1350Stmt::child_iterator OverloadExpr::child_begin() { 1351 return reinterpret_cast<Stmt**>(&SubExprs[0]); 1352} 1353Stmt::child_iterator OverloadExpr::child_end() { 1354 return reinterpret_cast<Stmt**>(&SubExprs[NumExprs]); 1355} 1356 1357// ShuffleVectorExpr 1358Stmt::child_iterator ShuffleVectorExpr::child_begin() { 1359 return reinterpret_cast<Stmt**>(&SubExprs[0]); 1360} 1361Stmt::child_iterator ShuffleVectorExpr::child_end() { 1362 return reinterpret_cast<Stmt**>(&SubExprs[NumExprs]); 1363} 1364 1365// VAArgExpr 1366Stmt::child_iterator VAArgExpr::child_begin() { 1367 return reinterpret_cast<Stmt**>(&Val); 1368} 1369 1370Stmt::child_iterator VAArgExpr::child_end() { 1371 return reinterpret_cast<Stmt**>(&Val)+1; 1372} 1373 1374// InitListExpr 1375Stmt::child_iterator InitListExpr::child_begin() { 1376 return reinterpret_cast<Stmt**>(InitExprs.size() ? 1377 &InitExprs[0] : 0); 1378} 1379Stmt::child_iterator InitListExpr::child_end() { 1380 return reinterpret_cast<Stmt**>(InitExprs.size() ? 1381 &InitExprs[0] + InitExprs.size() : 0); 1382} 1383 1384// ObjCStringLiteral 1385Stmt::child_iterator ObjCStringLiteral::child_begin() { 1386 return child_iterator(); 1387} 1388Stmt::child_iterator ObjCStringLiteral::child_end() { 1389 return child_iterator(); 1390} 1391 1392// ObjCEncodeExpr 1393Stmt::child_iterator ObjCEncodeExpr::child_begin() { return child_iterator(); } 1394Stmt::child_iterator ObjCEncodeExpr::child_end() { return child_iterator(); } 1395 1396// ObjCSelectorExpr 1397Stmt::child_iterator ObjCSelectorExpr::child_begin() { 1398 return child_iterator(); 1399} 1400Stmt::child_iterator ObjCSelectorExpr::child_end() { 1401 return child_iterator(); 1402} 1403 1404// ObjCProtocolExpr 1405Stmt::child_iterator ObjCProtocolExpr::child_begin() { 1406 return child_iterator(); 1407} 1408Stmt::child_iterator ObjCProtocolExpr::child_end() { 1409 return child_iterator(); 1410} 1411 1412// ObjCMessageExpr 1413Stmt::child_iterator ObjCMessageExpr::child_begin() { 1414 return reinterpret_cast<Stmt**>(&SubExprs[ getReceiver() ? 0 : ARGS_START ]); 1415} 1416Stmt::child_iterator ObjCMessageExpr::child_end() { 1417 return reinterpret_cast<Stmt**>(&SubExprs[getNumArgs()+ARGS_START]); 1418} 1419 1420