SemaExpr.cpp revision 8ba580c3126c63e82339cba4b52b37b36a019916
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 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 semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/Lex/Preprocessor.h" 20#include "clang/Lex/LiteralSupport.h" 21#include "clang/Basic/Diagnostic.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29//===----------------------------------------------------------------------===// 30// Standard Promotions and Conversions 31//===----------------------------------------------------------------------===// 32 33/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 34void Sema::DefaultFunctionArrayConversion(Expr *&E) { 35 QualType Ty = E->getType(); 36 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 37 38 if (Ty->isFunctionType()) 39 ImpCastExprToType(E, Context.getPointerType(Ty)); 40 else if (Ty->isArrayType()) { 41 // In C90 mode, arrays only promote to pointers if the array expression is 42 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 43 // type 'array of type' is converted to an expression that has type 'pointer 44 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 45 // that has type 'array of type' ...". The relevant change is "an lvalue" 46 // (C90) to "an expression" (C99). 47 // 48 // C++ 4.2p1: 49 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 50 // T" can be converted to an rvalue of type "pointer to T". 51 // 52 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 53 E->isLvalue(Context) == Expr::LV_Valid) 54 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 55 } 56} 57 58/// UsualUnaryConversions - Performs various conversions that are common to most 59/// operators (C99 6.3). The conversions of array and function types are 60/// sometimes surpressed. For example, the array->pointer conversion doesn't 61/// apply if the array is an argument to the sizeof or address (&) operators. 62/// In these instances, this routine should *not* be called. 63Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 64 QualType Ty = Expr->getType(); 65 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 66 67 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 68 ImpCastExprToType(Expr, Context.IntTy); 69 else 70 DefaultFunctionArrayConversion(Expr); 71 72 return Expr; 73} 74 75/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 76/// do not have a prototype. Arguments that have type float are promoted to 77/// double. All other argument types are converted by UsualUnaryConversions(). 78void Sema::DefaultArgumentPromotion(Expr *&Expr) { 79 QualType Ty = Expr->getType(); 80 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 81 82 // If this is a 'float' (CVR qualified or typedef) promote to double. 83 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 84 if (BT->getKind() == BuiltinType::Float) 85 return ImpCastExprToType(Expr, Context.DoubleTy); 86 87 UsualUnaryConversions(Expr); 88} 89 90/// UsualArithmeticConversions - Performs various conversions that are common to 91/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 92/// routine returns the first non-arithmetic type found. The client is 93/// responsible for emitting appropriate error diagnostics. 94/// FIXME: verify the conversion rules for "complex int" are consistent with 95/// GCC. 96QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 97 bool isCompAssign) { 98 if (!isCompAssign) { 99 UsualUnaryConversions(lhsExpr); 100 UsualUnaryConversions(rhsExpr); 101 } 102 103 // For conversion purposes, we ignore any qualifiers. 104 // For example, "const float" and "float" are equivalent. 105 QualType lhs = 106 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 107 QualType rhs = 108 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 109 110 // If both types are identical, no conversion is needed. 111 if (lhs == rhs) 112 return lhs; 113 114 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 115 // The caller can deal with this (e.g. pointer + int). 116 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 117 return lhs; 118 119 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 120 if (!isCompAssign) { 121 ImpCastExprToType(lhsExpr, destType); 122 ImpCastExprToType(rhsExpr, destType); 123 } 124 return destType; 125} 126 127QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 128 // Perform the usual unary conversions. We do this early so that 129 // integral promotions to "int" can allow us to exit early, in the 130 // lhs == rhs check. Also, for conversion purposes, we ignore any 131 // qualifiers. For example, "const float" and "float" are 132 // equivalent. 133 if (lhs->isPromotableIntegerType()) lhs = Context.IntTy; 134 else lhs = lhs.getUnqualifiedType(); 135 if (rhs->isPromotableIntegerType()) rhs = Context.IntTy; 136 else rhs = rhs.getUnqualifiedType(); 137 138 // If both types are identical, no conversion is needed. 139 if (lhs == rhs) 140 return lhs; 141 142 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 143 // The caller can deal with this (e.g. pointer + int). 144 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 145 return lhs; 146 147 // At this point, we have two different arithmetic types. 148 149 // Handle complex types first (C99 6.3.1.8p1). 150 if (lhs->isComplexType() || rhs->isComplexType()) { 151 // if we have an integer operand, the result is the complex type. 152 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 153 // convert the rhs to the lhs complex type. 154 return lhs; 155 } 156 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 157 // convert the lhs to the rhs complex type. 158 return rhs; 159 } 160 // This handles complex/complex, complex/float, or float/complex. 161 // When both operands are complex, the shorter operand is converted to the 162 // type of the longer, and that is the type of the result. This corresponds 163 // to what is done when combining two real floating-point operands. 164 // The fun begins when size promotion occur across type domains. 165 // From H&S 6.3.4: When one operand is complex and the other is a real 166 // floating-point type, the less precise type is converted, within it's 167 // real or complex domain, to the precision of the other type. For example, 168 // when combining a "long double" with a "double _Complex", the 169 // "double _Complex" is promoted to "long double _Complex". 170 int result = Context.getFloatingTypeOrder(lhs, rhs); 171 172 if (result > 0) { // The left side is bigger, convert rhs. 173 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 174 } else if (result < 0) { // The right side is bigger, convert lhs. 175 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 176 } 177 // At this point, lhs and rhs have the same rank/size. Now, make sure the 178 // domains match. This is a requirement for our implementation, C99 179 // does not require this promotion. 180 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 181 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 182 return rhs; 183 } else { // handle "_Complex double, double". 184 return lhs; 185 } 186 } 187 return lhs; // The domain/size match exactly. 188 } 189 // Now handle "real" floating types (i.e. float, double, long double). 190 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 191 // if we have an integer operand, the result is the real floating type. 192 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 193 // convert rhs to the lhs floating point type. 194 return lhs; 195 } 196 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 197 // convert lhs to the rhs floating point type. 198 return rhs; 199 } 200 // We have two real floating types, float/complex combos were handled above. 201 // Convert the smaller operand to the bigger result. 202 int result = Context.getFloatingTypeOrder(lhs, rhs); 203 204 if (result > 0) { // convert the rhs 205 return lhs; 206 } 207 if (result < 0) { // convert the lhs 208 return rhs; 209 } 210 assert(0 && "Sema::UsualArithmeticConversionsType(): illegal float comparison"); 211 } 212 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 213 // Handle GCC complex int extension. 214 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 215 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 216 217 if (lhsComplexInt && rhsComplexInt) { 218 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 219 rhsComplexInt->getElementType()) >= 0) { 220 // convert the rhs 221 return lhs; 222 } 223 return rhs; 224 } else if (lhsComplexInt && rhs->isIntegerType()) { 225 // convert the rhs to the lhs complex type. 226 return lhs; 227 } else if (rhsComplexInt && lhs->isIntegerType()) { 228 // convert the lhs to the rhs complex type. 229 return rhs; 230 } 231 } 232 // Finally, we have two differing integer types. 233 // The rules for this case are in C99 6.3.1.8 234 int compare = Context.getIntegerTypeOrder(lhs, rhs); 235 bool lhsSigned = lhs->isSignedIntegerType(), 236 rhsSigned = rhs->isSignedIntegerType(); 237 QualType destType; 238 if (lhsSigned == rhsSigned) { 239 // Same signedness; use the higher-ranked type 240 destType = compare >= 0 ? lhs : rhs; 241 } else if (compare != (lhsSigned ? 1 : -1)) { 242 // The unsigned type has greater than or equal rank to the 243 // signed type, so use the unsigned type 244 destType = lhsSigned ? rhs : lhs; 245 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 246 // The two types are different widths; if we are here, that 247 // means the signed type is larger than the unsigned type, so 248 // use the signed type. 249 destType = lhsSigned ? lhs : rhs; 250 } else { 251 // The signed type is higher-ranked than the unsigned type, 252 // but isn't actually any bigger (like unsigned int and long 253 // on most 32-bit systems). Use the unsigned type corresponding 254 // to the signed type. 255 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 256 } 257 return destType; 258} 259 260//===----------------------------------------------------------------------===// 261// Semantic Analysis for various Expression Types 262//===----------------------------------------------------------------------===// 263 264 265/// ActOnStringLiteral - The specified tokens were lexed as pasted string 266/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 267/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 268/// multiple tokens. However, the common case is that StringToks points to one 269/// string. 270/// 271Action::ExprResult 272Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 273 assert(NumStringToks && "Must have at least one string!"); 274 275 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 276 if (Literal.hadError) 277 return ExprResult(true); 278 279 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 280 for (unsigned i = 0; i != NumStringToks; ++i) 281 StringTokLocs.push_back(StringToks[i].getLocation()); 282 283 // Verify that pascal strings aren't too large. 284 if (Literal.Pascal && Literal.GetStringLength() > 256) 285 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long) 286 << SourceRange(StringToks[0].getLocation(), 287 StringToks[NumStringToks-1].getLocation()); 288 289 QualType StrTy = Context.CharTy; 290 if (Literal.AnyWide) StrTy = Context.getWCharType(); 291 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 292 293 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 294 if (getLangOptions().CPlusPlus) 295 StrTy.addConst(); 296 297 // Get an array type for the string, according to C99 6.4.5. This includes 298 // the nul terminator character as well as the string length for pascal 299 // strings. 300 StrTy = Context.getConstantArrayType(StrTy, 301 llvm::APInt(32, Literal.GetStringLength()+1), 302 ArrayType::Normal, 0); 303 304 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 305 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 306 Literal.AnyWide, StrTy, 307 StringToks[0].getLocation(), 308 StringToks[NumStringToks-1].getLocation()); 309} 310 311/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 312/// CurBlock to VD should cause it to be snapshotted (as we do for auto 313/// variables defined outside the block) or false if this is not needed (e.g. 314/// for values inside the block or for globals). 315/// 316/// FIXME: This will create BlockDeclRefExprs for global variables, 317/// function references, etc which is suboptimal :) and breaks 318/// things like "integer constant expression" tests. 319static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 320 ValueDecl *VD) { 321 // If the value is defined inside the block, we couldn't snapshot it even if 322 // we wanted to. 323 if (CurBlock->TheDecl == VD->getDeclContext()) 324 return false; 325 326 // If this is an enum constant or function, it is constant, don't snapshot. 327 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 328 return false; 329 330 // If this is a reference to an extern, static, or global variable, no need to 331 // snapshot it. 332 // FIXME: What about 'const' variables in C++? 333 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 334 return Var->hasLocalStorage(); 335 336 return true; 337} 338 339 340 341/// ActOnIdentifierExpr - The parser read an identifier in expression context, 342/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 343/// identifier is used in a function call context. 344/// LookupCtx is only used for a C++ qualified-id (foo::bar) to indicate the 345/// class or namespace that the identifier must be a member of. 346Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 347 IdentifierInfo &II, 348 bool HasTrailingLParen, 349 const CXXScopeSpec *SS) { 350 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS); 351} 352 353/// ActOnDeclarationNameExpr - The parser has read some kind of name 354/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 355/// performs lookup on that name and returns an expression that refers 356/// to that name. This routine isn't directly called from the parser, 357/// because the parser doesn't know about DeclarationName. Rather, 358/// this routine is called by ActOnIdentifierExpr, 359/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 360/// which form the DeclarationName from the corresponding syntactic 361/// forms. 362/// 363/// HasTrailingLParen indicates whether this identifier is used in a 364/// function call context. LookupCtx is only used for a C++ 365/// qualified-id (foo::bar) to indicate the class or namespace that 366/// the identifier must be a member of. 367Sema::ExprResult Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 368 DeclarationName Name, 369 bool HasTrailingLParen, 370 const CXXScopeSpec *SS) { 371 // Could be enum-constant, value decl, instance variable, etc. 372 Decl *D; 373 if (SS && !SS->isEmpty()) { 374 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 375 if (DC == 0) 376 return true; 377 D = LookupDecl(Name, Decl::IDNS_Ordinary, S, DC); 378 } else 379 D = LookupDecl(Name, Decl::IDNS_Ordinary, S); 380 381 // If this reference is in an Objective-C method, then ivar lookup happens as 382 // well. 383 IdentifierInfo *II = Name.getAsIdentifierInfo(); 384 if (II && getCurMethodDecl()) { 385 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 386 // There are two cases to handle here. 1) scoped lookup could have failed, 387 // in which case we should look for an ivar. 2) scoped lookup could have 388 // found a decl, but that decl is outside the current method (i.e. a global 389 // variable). In these two cases, we do a lookup for an ivar with this 390 // name, if the lookup suceeds, we replace it our current decl. 391 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 392 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 393 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II)) { 394 // FIXME: This should use a new expr for a direct reference, don't turn 395 // this into Self->ivar, just return a BareIVarExpr or something. 396 IdentifierInfo &II = Context.Idents.get("self"); 397 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 398 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 399 static_cast<Expr*>(SelfExpr.Val), true, true); 400 } 401 } 402 // Needed to implement property "super.method" notation. 403 if (SD == 0 && II == SuperID) { 404 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 405 getCurMethodDecl()->getClassInterface())); 406 return new ObjCSuperExpr(Loc, T); 407 } 408 } 409 if (D == 0) { 410 // Otherwise, this could be an implicitly declared function reference (legal 411 // in C90, extension in C99). 412 if (HasTrailingLParen && II && 413 !getLangOptions().CPlusPlus) // Not in C++. 414 D = ImplicitlyDefineFunction(Loc, *II, S); 415 else { 416 // If this name wasn't predeclared and if this is not a function call, 417 // diagnose the problem. 418 if (SS && !SS->isEmpty()) 419 return Diag(Loc, diag::err_typecheck_no_member, 420 Name.getAsString(), SS->getRange()); 421 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 422 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 423 return Diag(Loc, diag::err_undeclared_use) << Name.getAsString(); 424 else 425 return Diag(Loc, diag::err_undeclared_var_use) << Name.getAsString(); 426 } 427 } 428 429 if (CXXFieldDecl *FD = dyn_cast<CXXFieldDecl>(D)) { 430 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 431 if (MD->isStatic()) 432 // "invalid use of member 'x' in static member function" 433 return Diag(Loc, diag::err_invalid_member_use_in_static_method) 434 << FD->getName(); 435 if (cast<CXXRecordDecl>(MD->getParent()) != FD->getParent()) 436 // "invalid use of nonstatic data member 'x'" 437 return Diag(Loc, diag::err_invalid_non_static_member_use) 438 << FD->getName(); 439 440 if (FD->isInvalidDecl()) 441 return true; 442 443 // FIXME: Handle 'mutable'. 444 return new DeclRefExpr(FD, 445 FD->getType().getWithAdditionalQualifiers(MD->getTypeQualifiers()),Loc); 446 } 447 448 return Diag(Loc, diag::err_invalid_non_static_member_use) << FD->getName(); 449 } 450 if (isa<TypedefDecl>(D)) 451 return Diag(Loc, diag::err_unexpected_typedef) << Name.getAsString(); 452 if (isa<ObjCInterfaceDecl>(D)) 453 return Diag(Loc, diag::err_unexpected_interface) << Name.getAsString(); 454 if (isa<NamespaceDecl>(D)) 455 return Diag(Loc, diag::err_unexpected_namespace) << Name.getAsString(); 456 457 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 458 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 459 return new DeclRefExpr(Ovl, Context.OverloadTy, Loc); 460 461 ValueDecl *VD = cast<ValueDecl>(D); 462 463 // check if referencing an identifier with __attribute__((deprecated)). 464 if (VD->getAttr<DeprecatedAttr>()) 465 Diag(Loc, diag::warn_deprecated) << VD->getName(); 466 467 // Only create DeclRefExpr's for valid Decl's. 468 if (VD->isInvalidDecl()) 469 return true; 470 471 // If the identifier reference is inside a block, and it refers to a value 472 // that is outside the block, create a BlockDeclRefExpr instead of a 473 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 474 // the block is formed. 475 // 476 // We do not do this for things like enum constants, global variables, etc, 477 // as they do not get snapshotted. 478 // 479 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 480 // The BlocksAttr indicates the variable is bound by-reference. 481 if (VD->getAttr<BlocksAttr>()) 482 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 483 Loc, true); 484 485 // Variable will be bound by-copy, make it const within the closure. 486 VD->getType().addConst(); 487 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 488 Loc, false); 489 } 490 // If this reference is not in a block or if the referenced variable is 491 // within the block, create a normal DeclRefExpr. 492 return new DeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc); 493} 494 495Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 496 tok::TokenKind Kind) { 497 PredefinedExpr::IdentType IT; 498 499 switch (Kind) { 500 default: assert(0 && "Unknown simple primary expr!"); 501 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 502 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 503 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 504 } 505 506 // Verify that this is in a function context. 507 if (getCurFunctionDecl() == 0 && getCurMethodDecl() == 0) 508 return Diag(Loc, diag::err_predef_outside_function); 509 510 // Pre-defined identifiers are of type char[x], where x is the length of the 511 // string. 512 unsigned Length; 513 if (getCurFunctionDecl()) 514 Length = getCurFunctionDecl()->getIdentifier()->getLength(); 515 else 516 Length = getCurMethodDecl()->getSynthesizedMethodSize(); 517 518 llvm::APInt LengthI(32, Length + 1); 519 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 520 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 521 return new PredefinedExpr(Loc, ResTy, IT); 522} 523 524Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 525 llvm::SmallString<16> CharBuffer; 526 CharBuffer.resize(Tok.getLength()); 527 const char *ThisTokBegin = &CharBuffer[0]; 528 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 529 530 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 531 Tok.getLocation(), PP); 532 if (Literal.hadError()) 533 return ExprResult(true); 534 535 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 536 537 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 538 Tok.getLocation()); 539} 540 541Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 542 // fast path for a single digit (which is quite common). A single digit 543 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 544 if (Tok.getLength() == 1) { 545 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 546 547 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 548 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 549 Context.IntTy, 550 Tok.getLocation())); 551 } 552 llvm::SmallString<512> IntegerBuffer; 553 // Add padding so that NumericLiteralParser can overread by one character. 554 IntegerBuffer.resize(Tok.getLength()+1); 555 const char *ThisTokBegin = &IntegerBuffer[0]; 556 557 // Get the spelling of the token, which eliminates trigraphs, etc. 558 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 559 560 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 561 Tok.getLocation(), PP); 562 if (Literal.hadError) 563 return ExprResult(true); 564 565 Expr *Res; 566 567 if (Literal.isFloatingLiteral()) { 568 QualType Ty; 569 if (Literal.isFloat) 570 Ty = Context.FloatTy; 571 else if (!Literal.isLong) 572 Ty = Context.DoubleTy; 573 else 574 Ty = Context.LongDoubleTy; 575 576 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 577 578 // isExact will be set by GetFloatValue(). 579 bool isExact = false; 580 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 581 Ty, Tok.getLocation()); 582 583 } else if (!Literal.isIntegerLiteral()) { 584 return ExprResult(true); 585 } else { 586 QualType Ty; 587 588 // long long is a C99 feature. 589 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 590 Literal.isLongLong) 591 Diag(Tok.getLocation(), diag::ext_longlong); 592 593 // Get the value in the widest-possible width. 594 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 595 596 if (Literal.GetIntegerValue(ResultVal)) { 597 // If this value didn't fit into uintmax_t, warn and force to ull. 598 Diag(Tok.getLocation(), diag::warn_integer_too_large); 599 Ty = Context.UnsignedLongLongTy; 600 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 601 "long long is not intmax_t?"); 602 } else { 603 // If this value fits into a ULL, try to figure out what else it fits into 604 // according to the rules of C99 6.4.4.1p5. 605 606 // Octal, Hexadecimal, and integers with a U suffix are allowed to 607 // be an unsigned int. 608 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 609 610 // Check from smallest to largest, picking the smallest type we can. 611 unsigned Width = 0; 612 if (!Literal.isLong && !Literal.isLongLong) { 613 // Are int/unsigned possibilities? 614 unsigned IntSize = Context.Target.getIntWidth(); 615 616 // Does it fit in a unsigned int? 617 if (ResultVal.isIntN(IntSize)) { 618 // Does it fit in a signed int? 619 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 620 Ty = Context.IntTy; 621 else if (AllowUnsigned) 622 Ty = Context.UnsignedIntTy; 623 Width = IntSize; 624 } 625 } 626 627 // Are long/unsigned long possibilities? 628 if (Ty.isNull() && !Literal.isLongLong) { 629 unsigned LongSize = Context.Target.getLongWidth(); 630 631 // Does it fit in a unsigned long? 632 if (ResultVal.isIntN(LongSize)) { 633 // Does it fit in a signed long? 634 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 635 Ty = Context.LongTy; 636 else if (AllowUnsigned) 637 Ty = Context.UnsignedLongTy; 638 Width = LongSize; 639 } 640 } 641 642 // Finally, check long long if needed. 643 if (Ty.isNull()) { 644 unsigned LongLongSize = Context.Target.getLongLongWidth(); 645 646 // Does it fit in a unsigned long long? 647 if (ResultVal.isIntN(LongLongSize)) { 648 // Does it fit in a signed long long? 649 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 650 Ty = Context.LongLongTy; 651 else if (AllowUnsigned) 652 Ty = Context.UnsignedLongLongTy; 653 Width = LongLongSize; 654 } 655 } 656 657 // If we still couldn't decide a type, we probably have something that 658 // does not fit in a signed long long, but has no U suffix. 659 if (Ty.isNull()) { 660 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 661 Ty = Context.UnsignedLongLongTy; 662 Width = Context.Target.getLongLongWidth(); 663 } 664 665 if (ResultVal.getBitWidth() != Width) 666 ResultVal.trunc(Width); 667 } 668 669 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 670 } 671 672 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 673 if (Literal.isImaginary) 674 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 675 676 return Res; 677} 678 679Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 680 ExprTy *Val) { 681 Expr *E = (Expr *)Val; 682 assert((E != 0) && "ActOnParenExpr() missing expr"); 683 return new ParenExpr(L, R, E); 684} 685 686/// The UsualUnaryConversions() function is *not* called by this routine. 687/// See C99 6.3.2.1p[2-4] for more details. 688bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 689 SourceLocation OpLoc, 690 const SourceRange &ExprRange, 691 bool isSizeof) { 692 // C99 6.5.3.4p1: 693 if (isa<FunctionType>(exprType) && isSizeof) 694 // alignof(function) is allowed. 695 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 696 else if (exprType->isVoidType()) 697 Diag(OpLoc, diag::ext_sizeof_void_type) 698 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 699 else if (exprType->isIncompleteType()) 700 return Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 701 diag::err_alignof_incomplete_type) 702 << exprType.getAsString() << ExprRange; 703 704 return false; 705} 706 707/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 708/// the same for @c alignof and @c __alignof 709/// Note that the ArgRange is invalid if isType is false. 710Action::ExprResult 711Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 712 void *TyOrEx, const SourceRange &ArgRange) { 713 // If error parsing type, ignore. 714 if (TyOrEx == 0) return true; 715 716 QualType ArgTy; 717 SourceRange Range; 718 if (isType) { 719 ArgTy = QualType::getFromOpaquePtr(TyOrEx); 720 Range = ArgRange; 721 } else { 722 // Get the end location. 723 Expr *ArgEx = (Expr *)TyOrEx; 724 Range = ArgEx->getSourceRange(); 725 ArgTy = ArgEx->getType(); 726 } 727 728 // Verify that the operand is valid. 729 if (CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, isSizeof)) 730 return true; 731 732 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 733 return new SizeOfAlignOfExpr(isSizeof, isType, TyOrEx, Context.getSizeType(), 734 OpLoc, Range.getEnd()); 735} 736 737QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 738 DefaultFunctionArrayConversion(V); 739 740 // These operators return the element type of a complex type. 741 if (const ComplexType *CT = V->getType()->getAsComplexType()) 742 return CT->getElementType(); 743 744 // Otherwise they pass through real integer and floating point types here. 745 if (V->getType()->isArithmeticType()) 746 return V->getType(); 747 748 // Reject anything else. 749 Diag(Loc, diag::err_realimag_invalid_type) << V->getType().getAsString(); 750 return QualType(); 751} 752 753 754 755Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 756 tok::TokenKind Kind, 757 ExprTy *Input) { 758 UnaryOperator::Opcode Opc; 759 switch (Kind) { 760 default: assert(0 && "Unknown unary op!"); 761 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 762 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 763 } 764 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 765 if (result.isNull()) 766 return true; 767 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 768} 769 770Action::ExprResult Sema:: 771ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 772 ExprTy *Idx, SourceLocation RLoc) { 773 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 774 775 // Perform default conversions. 776 DefaultFunctionArrayConversion(LHSExp); 777 DefaultFunctionArrayConversion(RHSExp); 778 779 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 780 781 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 782 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 783 // in the subscript position. As a result, we need to derive the array base 784 // and index from the expression types. 785 Expr *BaseExpr, *IndexExpr; 786 QualType ResultType; 787 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 788 BaseExpr = LHSExp; 789 IndexExpr = RHSExp; 790 // FIXME: need to deal with const... 791 ResultType = PTy->getPointeeType(); 792 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 793 // Handle the uncommon case of "123[Ptr]". 794 BaseExpr = RHSExp; 795 IndexExpr = LHSExp; 796 // FIXME: need to deal with const... 797 ResultType = PTy->getPointeeType(); 798 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 799 BaseExpr = LHSExp; // vectors: V[123] 800 IndexExpr = RHSExp; 801 802 // Component access limited to variables (reject vec4.rg[1]). 803 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 804 !isa<ExtVectorElementExpr>(BaseExpr)) 805 return Diag(LLoc, diag::err_ext_vector_component_access) 806 << SourceRange(LLoc, RLoc); 807 // FIXME: need to deal with const... 808 ResultType = VTy->getElementType(); 809 } else { 810 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value) 811 << RHSExp->getSourceRange(); 812 } 813 // C99 6.5.2.1p1 814 if (!IndexExpr->getType()->isIntegerType()) 815 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript) 816 << IndexExpr->getSourceRange(); 817 818 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 819 // the following check catches trying to index a pointer to a function (e.g. 820 // void (*)(int)) and pointers to incomplete types. Functions are not 821 // objects in C99. 822 if (!ResultType->isObjectType()) 823 return Diag(BaseExpr->getLocStart(), 824 diag::err_typecheck_subscript_not_object) 825 << BaseExpr->getType().getAsString() << BaseExpr->getSourceRange(); 826 827 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 828} 829 830QualType Sema:: 831CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 832 IdentifierInfo &CompName, SourceLocation CompLoc) { 833 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 834 835 // This flag determines whether or not the component is to be treated as a 836 // special name, or a regular GLSL-style component access. 837 bool SpecialComponent = false; 838 839 // The vector accessor can't exceed the number of elements. 840 const char *compStr = CompName.getName(); 841 if (strlen(compStr) > vecType->getNumElements()) { 842 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 843 << baseType.getAsString() << SourceRange(CompLoc); 844 return QualType(); 845 } 846 847 // Check that we've found one of the special components, or that the component 848 // names must come from the same set. 849 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 850 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 851 SpecialComponent = true; 852 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 853 do 854 compStr++; 855 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 856 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 857 do 858 compStr++; 859 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 860 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 861 do 862 compStr++; 863 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 864 } 865 866 if (!SpecialComponent && *compStr) { 867 // We didn't get to the end of the string. This means the component names 868 // didn't come from the same set *or* we encountered an illegal name. 869 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 870 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 871 return QualType(); 872 } 873 // Each component accessor can't exceed the vector type. 874 compStr = CompName.getName(); 875 while (*compStr) { 876 if (vecType->isAccessorWithinNumElements(*compStr)) 877 compStr++; 878 else 879 break; 880 } 881 if (!SpecialComponent && *compStr) { 882 // We didn't get to the end of the string. This means a component accessor 883 // exceeds the number of elements in the vector. 884 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 885 << baseType.getAsString() << SourceRange(CompLoc); 886 return QualType(); 887 } 888 889 // If we have a special component name, verify that the current vector length 890 // is an even number, since all special component names return exactly half 891 // the elements. 892 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 893 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 894 << baseType.getAsString() << SourceRange(CompLoc); 895 return QualType(); 896 } 897 898 // The component accessor looks fine - now we need to compute the actual type. 899 // The vector type is implied by the component accessor. For example, 900 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 901 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 902 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 903 : strlen(CompName.getName()); 904 if (CompSize == 1) 905 return vecType->getElementType(); 906 907 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 908 // Now look up the TypeDefDecl from the vector type. Without this, 909 // diagostics look bad. We want extended vector types to appear built-in. 910 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 911 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 912 return Context.getTypedefType(ExtVectorDecls[i]); 913 } 914 return VT; // should never get here (a typedef type should always be found). 915} 916 917/// constructSetterName - Return the setter name for the given 918/// identifier, i.e. "set" + Name where the initial character of Name 919/// has been capitalized. 920// FIXME: Merge with same routine in Parser. But where should this 921// live? 922static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 923 const IdentifierInfo *Name) { 924 unsigned N = Name->getLength(); 925 char *SelectorName = new char[3 + N]; 926 memcpy(SelectorName, "set", 3); 927 memcpy(&SelectorName[3], Name->getName(), N); 928 SelectorName[3] = toupper(SelectorName[3]); 929 930 IdentifierInfo *Setter = 931 &Idents.get(SelectorName, &SelectorName[3 + N]); 932 delete[] SelectorName; 933 return Setter; 934} 935 936Action::ExprResult Sema:: 937ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 938 tok::TokenKind OpKind, SourceLocation MemberLoc, 939 IdentifierInfo &Member) { 940 Expr *BaseExpr = static_cast<Expr *>(Base); 941 assert(BaseExpr && "no record expression"); 942 943 // Perform default conversions. 944 DefaultFunctionArrayConversion(BaseExpr); 945 946 QualType BaseType = BaseExpr->getType(); 947 assert(!BaseType.isNull() && "no type for member expression"); 948 949 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 950 // must have pointer type, and the accessed type is the pointee. 951 if (OpKind == tok::arrow) { 952 if (const PointerType *PT = BaseType->getAsPointerType()) 953 BaseType = PT->getPointeeType(); 954 else 955 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow) 956 << BaseType.getAsString() << BaseExpr->getSourceRange(); 957 } 958 959 // Handle field access to simple records. This also handles access to fields 960 // of the ObjC 'id' struct. 961 if (const RecordType *RTy = BaseType->getAsRecordType()) { 962 RecordDecl *RDecl = RTy->getDecl(); 963 if (RTy->isIncompleteType()) 964 return Diag(OpLoc, diag::err_typecheck_incomplete_tag) 965 << RDecl->getName() << BaseExpr->getSourceRange(); 966 // The record definition is complete, now make sure the member is valid. 967 FieldDecl *MemberDecl = RDecl->getMember(&Member); 968 if (!MemberDecl) 969 return Diag(MemberLoc, diag::err_typecheck_no_member) 970 << Member.getName() << BaseExpr->getSourceRange(); 971 972 // Figure out the type of the member; see C99 6.5.2.3p3 973 // FIXME: Handle address space modifiers 974 QualType MemberType = MemberDecl->getType(); 975 unsigned combinedQualifiers = 976 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 977 if (CXXFieldDecl *CXXMember = dyn_cast<CXXFieldDecl>(MemberDecl)) { 978 if (CXXMember->isMutable()) 979 combinedQualifiers &= ~QualType::Const; 980 } 981 MemberType = MemberType.getQualifiedType(combinedQualifiers); 982 983 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 984 MemberLoc, MemberType); 985 } 986 987 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 988 // (*Obj).ivar. 989 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 990 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) 991 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 992 OpKind == tok::arrow); 993 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 994 << IFTy->getDecl()->getName() << Member.getName() 995 << BaseExpr->getSourceRange(); 996 } 997 998 // Handle Objective-C property access, which is "Obj.property" where Obj is a 999 // pointer to a (potentially qualified) interface type. 1000 const PointerType *PTy; 1001 const ObjCInterfaceType *IFTy; 1002 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1003 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1004 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1005 1006 // Search for a declared property first. 1007 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 1008 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1009 1010 // Check protocols on qualified interfaces. 1011 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1012 E = IFTy->qual_end(); I != E; ++I) 1013 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1014 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1015 1016 // If that failed, look for an "implicit" property by seeing if the nullary 1017 // selector is implemented. 1018 1019 // FIXME: The logic for looking up nullary and unary selectors should be 1020 // shared with the code in ActOnInstanceMessage. 1021 1022 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1023 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1024 1025 // If this reference is in an @implementation, check for 'private' methods. 1026 if (!Getter) 1027 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1028 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1029 if (ObjCImplementationDecl *ImpDecl = 1030 ObjCImplementations[ClassDecl->getIdentifier()]) 1031 Getter = ImpDecl->getInstanceMethod(Sel); 1032 1033 // Look through local category implementations associated with the class. 1034 if (!Getter) { 1035 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1036 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1037 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1038 } 1039 } 1040 if (Getter) { 1041 // If we found a getter then this may be a valid dot-reference, we 1042 // need to also look for the matching setter. 1043 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 1044 &Member); 1045 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 1046 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1047 1048 if (!Setter) { 1049 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1050 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1051 if (ObjCImplementationDecl *ImpDecl = 1052 ObjCImplementations[ClassDecl->getIdentifier()]) 1053 Setter = ImpDecl->getInstanceMethod(SetterSel); 1054 } 1055 1056 // FIXME: There are some issues here. First, we are not 1057 // diagnosing accesses to read-only properties because we do not 1058 // know if this is a getter or setter yet. Second, we are 1059 // checking that the type of the setter matches the type we 1060 // expect. 1061 return new ObjCPropertyRefExpr(Getter, Setter, Getter->getResultType(), 1062 MemberLoc, BaseExpr); 1063 } 1064 } 1065 // Handle properties on qualified "id" protocols. 1066 const ObjCQualifiedIdType *QIdTy; 1067 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1068 // Check protocols on qualified interfaces. 1069 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1070 E = QIdTy->qual_end(); I != E; ++I) 1071 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1072 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1073 } 1074 // Handle 'field access' to vectors, such as 'V.xx'. 1075 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1076 // Component access limited to variables (reject vec4.rg.g). 1077 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1078 !isa<ExtVectorElementExpr>(BaseExpr)) 1079 return Diag(MemberLoc, diag::err_ext_vector_component_access) 1080 << BaseExpr->getSourceRange(); 1081 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1082 if (ret.isNull()) 1083 return true; 1084 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1085 } 1086 1087 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 1088 << BaseType.getAsString() << BaseExpr->getSourceRange(); 1089} 1090 1091/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1092/// This provides the location of the left/right parens and a list of comma 1093/// locations. 1094Action::ExprResult Sema:: 1095ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 1096 ExprTy **args, unsigned NumArgs, 1097 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1098 Expr *Fn = static_cast<Expr *>(fn); 1099 Expr **Args = reinterpret_cast<Expr**>(args); 1100 assert(Fn && "no function call expression"); 1101 FunctionDecl *FDecl = NULL; 1102 OverloadedFunctionDecl *Ovl = NULL; 1103 1104 // If we're directly calling a function or a set of overloaded 1105 // functions, get the appropriate declaration. 1106 { 1107 DeclRefExpr *DRExpr = NULL; 1108 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1109 DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()); 1110 else 1111 DRExpr = dyn_cast<DeclRefExpr>(Fn); 1112 1113 if (DRExpr) { 1114 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1115 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1116 } 1117 } 1118 1119 // If we have a set of overloaded functions, perform overload 1120 // resolution to pick the function. 1121 if (Ovl) { 1122 OverloadCandidateSet CandidateSet; 1123 OverloadCandidateSet::iterator Best; 1124 AddOverloadCandidates(Ovl, Args, NumArgs, CandidateSet); 1125 switch (BestViableFunction(CandidateSet, Best)) { 1126 case OR_Success: 1127 { 1128 // Success! Let the remainder of this function build a call to 1129 // the function selected by overload resolution. 1130 FDecl = Best->Function; 1131 Expr *NewFn = new DeclRefExpr(FDecl, FDecl->getType(), 1132 Fn->getSourceRange().getBegin()); 1133 delete Fn; 1134 Fn = NewFn; 1135 } 1136 break; 1137 1138 case OR_No_Viable_Function: 1139 if (CandidateSet.empty()) 1140 Diag(Fn->getSourceRange().getBegin(), 1141 diag::err_ovl_no_viable_function_in_call) 1142 << Ovl->getName() << Fn->getSourceRange(); 1143 else { 1144 Diag(Fn->getSourceRange().getBegin(), 1145 diag::err_ovl_no_viable_function_in_call_with_cands) 1146 << Ovl->getName() << Fn->getSourceRange(); 1147 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1148 } 1149 return true; 1150 1151 case OR_Ambiguous: 1152 Diag(Fn->getSourceRange().getBegin(), diag::err_ovl_ambiguous_call) 1153 << Ovl->getName() << Fn->getSourceRange(); 1154 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1155 return true; 1156 } 1157 } 1158 1159 // Promote the function operand. 1160 UsualUnaryConversions(Fn); 1161 1162 // Make the call expr early, before semantic checks. This guarantees cleanup 1163 // of arguments and function on error. 1164 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1165 Context.BoolTy, RParenLoc)); 1166 const FunctionType *FuncT; 1167 if (!Fn->getType()->isBlockPointerType()) { 1168 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1169 // have type pointer to function". 1170 const PointerType *PT = Fn->getType()->getAsPointerType(); 1171 if (PT == 0) 1172 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1173 << Fn->getSourceRange(); 1174 FuncT = PT->getPointeeType()->getAsFunctionType(); 1175 } else { // This is a block call. 1176 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1177 getAsFunctionType(); 1178 } 1179 if (FuncT == 0) 1180 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1181 << Fn->getSourceRange(); 1182 1183 // We know the result type of the call, set it. 1184 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 1185 1186 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1187 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1188 // assignment, to the types of the corresponding parameter, ... 1189 unsigned NumArgsInProto = Proto->getNumArgs(); 1190 unsigned NumArgsToCheck = NumArgs; 1191 1192 // If too few arguments are available (and we don't have default 1193 // arguments for the remaining parameters), don't make the call. 1194 if (NumArgs < NumArgsInProto) { 1195 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 1196 // Use default arguments for missing arguments 1197 NumArgsToCheck = NumArgsInProto; 1198 TheCall->setNumArgs(NumArgsInProto); 1199 } else 1200 return Diag(RParenLoc, 1201 !Fn->getType()->isBlockPointerType() 1202 ? diag::err_typecheck_call_too_few_args 1203 : diag::err_typecheck_block_too_few_args) 1204 << Fn->getSourceRange(); 1205 } 1206 1207 // If too many are passed and not variadic, error on the extras and drop 1208 // them. 1209 if (NumArgs > NumArgsInProto) { 1210 if (!Proto->isVariadic()) { 1211 Diag(Args[NumArgsInProto]->getLocStart(), 1212 !Fn->getType()->isBlockPointerType() 1213 ? diag::err_typecheck_call_too_many_args 1214 : diag::err_typecheck_block_too_many_args) 1215 << Fn->getSourceRange() 1216 << SourceRange(Args[NumArgsInProto]->getLocStart(), 1217 Args[NumArgs-1]->getLocEnd()); 1218 // This deletes the extra arguments. 1219 TheCall->setNumArgs(NumArgsInProto); 1220 } 1221 NumArgsToCheck = NumArgsInProto; 1222 } 1223 1224 // Continue to check argument types (even if we have too few/many args). 1225 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1226 QualType ProtoArgType = Proto->getArgType(i); 1227 1228 Expr *Arg; 1229 if (i < NumArgs) 1230 Arg = Args[i]; 1231 else 1232 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1233 QualType ArgType = Arg->getType(); 1234 1235 // Pass the argument. 1236 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 1237 return true; 1238 1239 TheCall->setArg(i, Arg); 1240 } 1241 1242 // If this is a variadic call, handle args passed through "...". 1243 if (Proto->isVariadic()) { 1244 // Promote the arguments (C99 6.5.2.2p7). 1245 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1246 Expr *Arg = Args[i]; 1247 DefaultArgumentPromotion(Arg); 1248 TheCall->setArg(i, Arg); 1249 } 1250 } 1251 } else { 1252 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1253 1254 // Promote the arguments (C99 6.5.2.2p6). 1255 for (unsigned i = 0; i != NumArgs; i++) { 1256 Expr *Arg = Args[i]; 1257 DefaultArgumentPromotion(Arg); 1258 TheCall->setArg(i, Arg); 1259 } 1260 } 1261 1262 // Do special checking on direct calls to functions. 1263 if (FDecl) 1264 return CheckFunctionCall(FDecl, TheCall.take()); 1265 1266 return TheCall.take(); 1267} 1268 1269Action::ExprResult Sema:: 1270ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1271 SourceLocation RParenLoc, ExprTy *InitExpr) { 1272 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1273 QualType literalType = QualType::getFromOpaquePtr(Ty); 1274 // FIXME: put back this assert when initializers are worked out. 1275 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1276 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1277 1278 if (literalType->isArrayType()) { 1279 if (literalType->isVariableArrayType()) 1280 return Diag(LParenLoc, diag::err_variable_object_no_init) 1281 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1282 } else if (literalType->isIncompleteType()) { 1283 return Diag(LParenLoc, diag::err_typecheck_decl_incomplete_type) 1284 << literalType.getAsString() 1285 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1286 } 1287 1288 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 1289 "temporary")) 1290 return true; 1291 1292 bool isFileScope = !getCurFunctionDecl() && !getCurMethodDecl(); 1293 if (isFileScope) { // 6.5.2.5p3 1294 if (CheckForConstantInitializer(literalExpr, literalType)) 1295 return true; 1296 } 1297 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, 1298 isFileScope); 1299} 1300 1301Action::ExprResult Sema:: 1302ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1303 InitListDesignations &Designators, 1304 SourceLocation RBraceLoc) { 1305 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1306 1307 // Semantic analysis for initializers is done by ActOnDeclarator() and 1308 // CheckInitializer() - it requires knowledge of the object being intialized. 1309 1310 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc, 1311 Designators.hasAnyDesignators()); 1312 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1313 return E; 1314} 1315 1316/// CheckCastTypes - Check type constraints for casting between types. 1317bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1318 UsualUnaryConversions(castExpr); 1319 1320 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1321 // type needs to be scalar. 1322 if (castType->isVoidType()) { 1323 // Cast to void allows any expr type. 1324 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1325 // GCC struct/union extension: allow cast to self. 1326 if (Context.getCanonicalType(castType) != 1327 Context.getCanonicalType(castExpr->getType()) || 1328 (!castType->isStructureType() && !castType->isUnionType())) { 1329 // Reject any other conversions to non-scalar types. 1330 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 1331 << castType.getAsString() << castExpr->getSourceRange(); 1332 } 1333 1334 // accept this, but emit an ext-warn. 1335 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 1336 << castType.getAsString() << castExpr->getSourceRange(); 1337 } else if (!castExpr->getType()->isScalarType() && 1338 !castExpr->getType()->isVectorType()) { 1339 return Diag(castExpr->getLocStart(), 1340 diag::err_typecheck_expect_scalar_operand) 1341 << castExpr->getType().getAsString() << castExpr->getSourceRange(); 1342 } else if (castExpr->getType()->isVectorType()) { 1343 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1344 return true; 1345 } else if (castType->isVectorType()) { 1346 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1347 return true; 1348 } 1349 return false; 1350} 1351 1352bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1353 assert(VectorTy->isVectorType() && "Not a vector type!"); 1354 1355 if (Ty->isVectorType() || Ty->isIntegerType()) { 1356 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1357 return Diag(R.getBegin(), 1358 Ty->isVectorType() ? 1359 diag::err_invalid_conversion_between_vectors : 1360 diag::err_invalid_conversion_between_vector_and_integer) 1361 << VectorTy.getAsString() << Ty.getAsString() << R; 1362 } else 1363 return Diag(R.getBegin(), 1364 diag::err_invalid_conversion_between_vector_and_scalar) 1365 << VectorTy.getAsString() << Ty.getAsString() << R; 1366 1367 return false; 1368} 1369 1370Action::ExprResult Sema:: 1371ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1372 SourceLocation RParenLoc, ExprTy *Op) { 1373 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1374 1375 Expr *castExpr = static_cast<Expr*>(Op); 1376 QualType castType = QualType::getFromOpaquePtr(Ty); 1377 1378 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1379 return true; 1380 return new CStyleCastExpr(castType, castExpr, castType, LParenLoc, RParenLoc); 1381} 1382 1383/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1384/// In that case, lex = cond. 1385inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1386 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1387 UsualUnaryConversions(cond); 1388 UsualUnaryConversions(lex); 1389 UsualUnaryConversions(rex); 1390 QualType condT = cond->getType(); 1391 QualType lexT = lex->getType(); 1392 QualType rexT = rex->getType(); 1393 1394 // first, check the condition. 1395 if (!condT->isScalarType()) { // C99 6.5.15p2 1396 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 1397 condT.getAsString()); 1398 return QualType(); 1399 } 1400 1401 // Now check the two expressions. 1402 1403 // If both operands have arithmetic type, do the usual arithmetic conversions 1404 // to find a common type: C99 6.5.15p3,5. 1405 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1406 UsualArithmeticConversions(lex, rex); 1407 return lex->getType(); 1408 } 1409 1410 // If both operands are the same structure or union type, the result is that 1411 // type. 1412 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1413 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1414 if (LHSRT->getDecl() == RHSRT->getDecl()) 1415 // "If both the operands have structure or union type, the result has 1416 // that type." This implies that CV qualifiers are dropped. 1417 return lexT.getUnqualifiedType(); 1418 } 1419 1420 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1421 // The following || allows only one side to be void (a GCC-ism). 1422 if (lexT->isVoidType() || rexT->isVoidType()) { 1423 if (!lexT->isVoidType()) 1424 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 1425 rex->getSourceRange()); 1426 if (!rexT->isVoidType()) 1427 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 1428 lex->getSourceRange()); 1429 ImpCastExprToType(lex, Context.VoidTy); 1430 ImpCastExprToType(rex, Context.VoidTy); 1431 return Context.VoidTy; 1432 } 1433 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1434 // the type of the other operand." 1435 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1436 Context.isObjCObjectPointerType(lexT)) && 1437 rex->isNullPointerConstant(Context)) { 1438 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1439 return lexT; 1440 } 1441 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1442 Context.isObjCObjectPointerType(rexT)) && 1443 lex->isNullPointerConstant(Context)) { 1444 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1445 return rexT; 1446 } 1447 // Handle the case where both operands are pointers before we handle null 1448 // pointer constants in case both operands are null pointer constants. 1449 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1450 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1451 // get the "pointed to" types 1452 QualType lhptee = LHSPT->getPointeeType(); 1453 QualType rhptee = RHSPT->getPointeeType(); 1454 1455 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1456 if (lhptee->isVoidType() && 1457 rhptee->isIncompleteOrObjectType()) { 1458 // Figure out necessary qualifiers (C99 6.5.15p6) 1459 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1460 QualType destType = Context.getPointerType(destPointee); 1461 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1462 ImpCastExprToType(rex, destType); // promote to void* 1463 return destType; 1464 } 1465 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1466 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1467 QualType destType = Context.getPointerType(destPointee); 1468 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1469 ImpCastExprToType(rex, destType); // promote to void* 1470 return destType; 1471 } 1472 1473 QualType compositeType = lexT; 1474 1475 // If either type is an Objective-C object type then check 1476 // compatibility according to Objective-C. 1477 if (Context.isObjCObjectPointerType(lexT) || 1478 Context.isObjCObjectPointerType(rexT)) { 1479 // If both operands are interfaces and either operand can be 1480 // assigned to the other, use that type as the composite 1481 // type. This allows 1482 // xxx ? (A*) a : (B*) b 1483 // where B is a subclass of A. 1484 // 1485 // Additionally, as for assignment, if either type is 'id' 1486 // allow silent coercion. Finally, if the types are 1487 // incompatible then make sure to use 'id' as the composite 1488 // type so the result is acceptable for sending messages to. 1489 1490 // FIXME: This code should not be localized to here. Also this 1491 // should use a compatible check instead of abusing the 1492 // canAssignObjCInterfaces code. 1493 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1494 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1495 if (LHSIface && RHSIface && 1496 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1497 compositeType = lexT; 1498 } else if (LHSIface && RHSIface && 1499 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1500 compositeType = rexT; 1501 } else if (Context.isObjCIdType(lhptee) || 1502 Context.isObjCIdType(rhptee)) { 1503 // FIXME: This code looks wrong, because isObjCIdType checks 1504 // the struct but getObjCIdType returns the pointer to 1505 // struct. This is horrible and should be fixed. 1506 compositeType = Context.getObjCIdType(); 1507 } else { 1508 QualType incompatTy = Context.getObjCIdType(); 1509 ImpCastExprToType(lex, incompatTy); 1510 ImpCastExprToType(rex, incompatTy); 1511 return incompatTy; 1512 } 1513 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1514 rhptee.getUnqualifiedType())) { 1515 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers) 1516 << lexT.getAsString() << rexT.getAsString() 1517 << lex->getSourceRange() << rex->getSourceRange(); 1518 // In this situation, we assume void* type. No especially good 1519 // reason, but this is what gcc does, and we do have to pick 1520 // to get a consistent AST. 1521 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1522 ImpCastExprToType(lex, incompatTy); 1523 ImpCastExprToType(rex, incompatTy); 1524 return incompatTy; 1525 } 1526 // The pointer types are compatible. 1527 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1528 // differently qualified versions of compatible types, the result type is 1529 // a pointer to an appropriately qualified version of the *composite* 1530 // type. 1531 // FIXME: Need to calculate the composite type. 1532 // FIXME: Need to add qualifiers 1533 ImpCastExprToType(lex, compositeType); 1534 ImpCastExprToType(rex, compositeType); 1535 return compositeType; 1536 } 1537 } 1538 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1539 // evaluates to "struct objc_object *" (and is handled above when comparing 1540 // id with statically typed objects). 1541 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1542 // GCC allows qualified id and any Objective-C type to devolve to 1543 // id. Currently localizing to here until clear this should be 1544 // part of ObjCQualifiedIdTypesAreCompatible. 1545 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1546 (lexT->isObjCQualifiedIdType() && 1547 Context.isObjCObjectPointerType(rexT)) || 1548 (rexT->isObjCQualifiedIdType() && 1549 Context.isObjCObjectPointerType(lexT))) { 1550 // FIXME: This is not the correct composite type. This only 1551 // happens to work because id can more or less be used anywhere, 1552 // however this may change the type of method sends. 1553 // FIXME: gcc adds some type-checking of the arguments and emits 1554 // (confusing) incompatible comparison warnings in some 1555 // cases. Investigate. 1556 QualType compositeType = Context.getObjCIdType(); 1557 ImpCastExprToType(lex, compositeType); 1558 ImpCastExprToType(rex, compositeType); 1559 return compositeType; 1560 } 1561 } 1562 1563 // Selection between block pointer types is ok as long as they are the same. 1564 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1565 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1566 return lexT; 1567 1568 // Otherwise, the operands are not compatible. 1569 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands) 1570 << lexT.getAsString() << rexT.getAsString() 1571 << lex->getSourceRange() << rex->getSourceRange(); 1572 return QualType(); 1573} 1574 1575/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1576/// in the case of a the GNU conditional expr extension. 1577Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1578 SourceLocation ColonLoc, 1579 ExprTy *Cond, ExprTy *LHS, 1580 ExprTy *RHS) { 1581 Expr *CondExpr = (Expr *) Cond; 1582 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1583 1584 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1585 // was the condition. 1586 bool isLHSNull = LHSExpr == 0; 1587 if (isLHSNull) 1588 LHSExpr = CondExpr; 1589 1590 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1591 RHSExpr, QuestionLoc); 1592 if (result.isNull()) 1593 return true; 1594 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1595 RHSExpr, result); 1596} 1597 1598 1599// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1600// being closely modeled after the C99 spec:-). The odd characteristic of this 1601// routine is it effectively iqnores the qualifiers on the top level pointee. 1602// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1603// FIXME: add a couple examples in this comment. 1604Sema::AssignConvertType 1605Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1606 QualType lhptee, rhptee; 1607 1608 // get the "pointed to" type (ignoring qualifiers at the top level) 1609 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1610 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1611 1612 // make sure we operate on the canonical type 1613 lhptee = Context.getCanonicalType(lhptee); 1614 rhptee = Context.getCanonicalType(rhptee); 1615 1616 AssignConvertType ConvTy = Compatible; 1617 1618 // C99 6.5.16.1p1: This following citation is common to constraints 1619 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1620 // qualifiers of the type *pointed to* by the right; 1621 // FIXME: Handle ASQualType 1622 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 1623 ConvTy = CompatiblePointerDiscardsQualifiers; 1624 1625 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1626 // incomplete type and the other is a pointer to a qualified or unqualified 1627 // version of void... 1628 if (lhptee->isVoidType()) { 1629 if (rhptee->isIncompleteOrObjectType()) 1630 return ConvTy; 1631 1632 // As an extension, we allow cast to/from void* to function pointer. 1633 assert(rhptee->isFunctionType()); 1634 return FunctionVoidPointer; 1635 } 1636 1637 if (rhptee->isVoidType()) { 1638 if (lhptee->isIncompleteOrObjectType()) 1639 return ConvTy; 1640 1641 // As an extension, we allow cast to/from void* to function pointer. 1642 assert(lhptee->isFunctionType()); 1643 return FunctionVoidPointer; 1644 } 1645 1646 // Check for ObjC interfaces 1647 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1648 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1649 if (LHSIface && RHSIface && 1650 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1651 return ConvTy; 1652 1653 // ID acts sort of like void* for ObjC interfaces 1654 if (LHSIface && Context.isObjCIdType(rhptee)) 1655 return ConvTy; 1656 if (RHSIface && Context.isObjCIdType(lhptee)) 1657 return ConvTy; 1658 1659 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1660 // unqualified versions of compatible types, ... 1661 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1662 rhptee.getUnqualifiedType())) 1663 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1664 return ConvTy; 1665} 1666 1667/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1668/// block pointer types are compatible or whether a block and normal pointer 1669/// are compatible. It is more restrict than comparing two function pointer 1670// types. 1671Sema::AssignConvertType 1672Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1673 QualType rhsType) { 1674 QualType lhptee, rhptee; 1675 1676 // get the "pointed to" type (ignoring qualifiers at the top level) 1677 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1678 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1679 1680 // make sure we operate on the canonical type 1681 lhptee = Context.getCanonicalType(lhptee); 1682 rhptee = Context.getCanonicalType(rhptee); 1683 1684 AssignConvertType ConvTy = Compatible; 1685 1686 // For blocks we enforce that qualifiers are identical. 1687 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1688 ConvTy = CompatiblePointerDiscardsQualifiers; 1689 1690 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1691 return IncompatibleBlockPointer; 1692 return ConvTy; 1693} 1694 1695/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1696/// has code to accommodate several GCC extensions when type checking 1697/// pointers. Here are some objectionable examples that GCC considers warnings: 1698/// 1699/// int a, *pint; 1700/// short *pshort; 1701/// struct foo *pfoo; 1702/// 1703/// pint = pshort; // warning: assignment from incompatible pointer type 1704/// a = pint; // warning: assignment makes integer from pointer without a cast 1705/// pint = a; // warning: assignment makes pointer from integer without a cast 1706/// pint = pfoo; // warning: assignment from incompatible pointer type 1707/// 1708/// As a result, the code for dealing with pointers is more complex than the 1709/// C99 spec dictates. 1710/// 1711Sema::AssignConvertType 1712Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1713 // Get canonical types. We're not formatting these types, just comparing 1714 // them. 1715 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1716 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1717 1718 if (lhsType == rhsType) 1719 return Compatible; // Common case: fast path an exact match. 1720 1721 // If the left-hand side is a reference type, then we are in a 1722 // (rare!) case where we've allowed the use of references in C, 1723 // e.g., as a parameter type in a built-in function. In this case, 1724 // just make sure that the type referenced is compatible with the 1725 // right-hand side type. The caller is responsible for adjusting 1726 // lhsType so that the resulting expression does not have reference 1727 // type. 1728 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 1729 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 1730 return Compatible; 1731 return Incompatible; 1732 } 1733 1734 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1735 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1736 return Compatible; 1737 // Relax integer conversions like we do for pointers below. 1738 if (rhsType->isIntegerType()) 1739 return IntToPointer; 1740 if (lhsType->isIntegerType()) 1741 return PointerToInt; 1742 return IncompatibleObjCQualifiedId; 1743 } 1744 1745 if (lhsType->isVectorType() || rhsType->isVectorType()) { 1746 // For ExtVector, allow vector splats; float -> <n x float> 1747 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 1748 if (LV->getElementType() == rhsType) 1749 return Compatible; 1750 1751 // If we are allowing lax vector conversions, and LHS and RHS are both 1752 // vectors, the total size only needs to be the same. This is a bitcast; 1753 // no bits are changed but the result type is different. 1754 if (getLangOptions().LaxVectorConversions && 1755 lhsType->isVectorType() && rhsType->isVectorType()) { 1756 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1757 return Compatible; 1758 } 1759 return Incompatible; 1760 } 1761 1762 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1763 return Compatible; 1764 1765 if (isa<PointerType>(lhsType)) { 1766 if (rhsType->isIntegerType()) 1767 return IntToPointer; 1768 1769 if (isa<PointerType>(rhsType)) 1770 return CheckPointerTypesForAssignment(lhsType, rhsType); 1771 1772 if (rhsType->getAsBlockPointerType()) { 1773 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1774 return BlockVoidPointer; 1775 1776 // Treat block pointers as objects. 1777 if (getLangOptions().ObjC1 && 1778 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 1779 return Compatible; 1780 } 1781 return Incompatible; 1782 } 1783 1784 if (isa<BlockPointerType>(lhsType)) { 1785 if (rhsType->isIntegerType()) 1786 return IntToPointer; 1787 1788 // Treat block pointers as objects. 1789 if (getLangOptions().ObjC1 && 1790 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 1791 return Compatible; 1792 1793 if (rhsType->isBlockPointerType()) 1794 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 1795 1796 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 1797 if (RHSPT->getPointeeType()->isVoidType()) 1798 return BlockVoidPointer; 1799 } 1800 return Incompatible; 1801 } 1802 1803 if (isa<PointerType>(rhsType)) { 1804 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1805 if (lhsType == Context.BoolTy) 1806 return Compatible; 1807 1808 if (lhsType->isIntegerType()) 1809 return PointerToInt; 1810 1811 if (isa<PointerType>(lhsType)) 1812 return CheckPointerTypesForAssignment(lhsType, rhsType); 1813 1814 if (isa<BlockPointerType>(lhsType) && 1815 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1816 return BlockVoidPointer; 1817 return Incompatible; 1818 } 1819 1820 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1821 if (Context.typesAreCompatible(lhsType, rhsType)) 1822 return Compatible; 1823 } 1824 return Incompatible; 1825} 1826 1827Sema::AssignConvertType 1828Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1829 if (getLangOptions().CPlusPlus) { 1830 if (!lhsType->isRecordType()) { 1831 // C++ 5.17p3: If the left operand is not of class type, the 1832 // expression is implicitly converted (C++ 4) to the 1833 // cv-unqualified type of the left operand. 1834 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType())) 1835 return Incompatible; 1836 else 1837 return Compatible; 1838 } 1839 1840 // FIXME: Currently, we fall through and treat C++ classes like C 1841 // structures. 1842 } 1843 1844 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1845 // a null pointer constant. 1846 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 1847 lhsType->isBlockPointerType()) 1848 && rExpr->isNullPointerConstant(Context)) { 1849 ImpCastExprToType(rExpr, lhsType); 1850 return Compatible; 1851 } 1852 1853 // We don't allow conversion of non-null-pointer constants to integers. 1854 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 1855 return IntToBlockPointer; 1856 1857 // This check seems unnatural, however it is necessary to ensure the proper 1858 // conversion of functions/arrays. If the conversion were done for all 1859 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1860 // expressions that surpress this implicit conversion (&, sizeof). 1861 // 1862 // Suppress this for references: C++ 8.5.3p5. 1863 if (!lhsType->isReferenceType()) 1864 DefaultFunctionArrayConversion(rExpr); 1865 1866 Sema::AssignConvertType result = 1867 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1868 1869 // C99 6.5.16.1p2: The value of the right operand is converted to the 1870 // type of the assignment expression. 1871 // CheckAssignmentConstraints allows the left-hand side to be a reference, 1872 // so that we can use references in built-in functions even in C. 1873 // The getNonReferenceType() call makes sure that the resulting expression 1874 // does not have reference type. 1875 if (rExpr->getType() != lhsType) 1876 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 1877 return result; 1878} 1879 1880Sema::AssignConvertType 1881Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1882 return CheckAssignmentConstraints(lhsType, rhsType); 1883} 1884 1885QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 1886 Diag(Loc, diag::err_typecheck_invalid_operands) 1887 << lex->getType().getAsString() << rex->getType().getAsString() 1888 << lex->getSourceRange() << rex->getSourceRange(); 1889 return QualType(); 1890} 1891 1892inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 1893 Expr *&rex) { 1894 // For conversion purposes, we ignore any qualifiers. 1895 // For example, "const float" and "float" are equivalent. 1896 QualType lhsType = 1897 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 1898 QualType rhsType = 1899 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 1900 1901 // If the vector types are identical, return. 1902 if (lhsType == rhsType) 1903 return lhsType; 1904 1905 // Handle the case of a vector & extvector type of the same size and element 1906 // type. It would be nice if we only had one vector type someday. 1907 if (getLangOptions().LaxVectorConversions) 1908 if (const VectorType *LV = lhsType->getAsVectorType()) 1909 if (const VectorType *RV = rhsType->getAsVectorType()) 1910 if (LV->getElementType() == RV->getElementType() && 1911 LV->getNumElements() == RV->getNumElements()) 1912 return lhsType->isExtVectorType() ? lhsType : rhsType; 1913 1914 // If the lhs is an extended vector and the rhs is a scalar of the same type 1915 // or a literal, promote the rhs to the vector type. 1916 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1917 QualType eltType = V->getElementType(); 1918 1919 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 1920 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 1921 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 1922 ImpCastExprToType(rex, lhsType); 1923 return lhsType; 1924 } 1925 } 1926 1927 // If the rhs is an extended vector and the lhs is a scalar of the same type, 1928 // promote the lhs to the vector type. 1929 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1930 QualType eltType = V->getElementType(); 1931 1932 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 1933 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 1934 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 1935 ImpCastExprToType(lex, rhsType); 1936 return rhsType; 1937 } 1938 } 1939 1940 // You cannot convert between vector values of different size. 1941 Diag(Loc, diag::err_typecheck_vector_not_convertable) 1942 << lex->getType().getAsString() << rex->getType().getAsString() 1943 << lex->getSourceRange() << rex->getSourceRange(); 1944 return QualType(); 1945} 1946 1947inline QualType Sema::CheckMultiplyDivideOperands( 1948 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 1949{ 1950 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1951 1952 if (lhsType->isVectorType() || rhsType->isVectorType()) 1953 return CheckVectorOperands(Loc, lex, rex); 1954 1955 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1956 1957 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1958 return compType; 1959 return InvalidOperands(Loc, lex, rex); 1960} 1961 1962inline QualType Sema::CheckRemainderOperands( 1963 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 1964{ 1965 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1966 1967 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1968 1969 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1970 return compType; 1971 return InvalidOperands(Loc, lex, rex); 1972} 1973 1974inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1975 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 1976{ 1977 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1978 return CheckVectorOperands(Loc, lex, rex); 1979 1980 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1981 1982 // handle the common case first (both operands are arithmetic). 1983 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1984 return compType; 1985 1986 // Put any potential pointer into PExp 1987 Expr* PExp = lex, *IExp = rex; 1988 if (IExp->getType()->isPointerType()) 1989 std::swap(PExp, IExp); 1990 1991 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1992 if (IExp->getType()->isIntegerType()) { 1993 // Check for arithmetic on pointers to incomplete types 1994 if (!PTy->getPointeeType()->isObjectType()) { 1995 if (PTy->getPointeeType()->isVoidType()) { 1996 Diag(Loc, diag::ext_gnu_void_ptr) 1997 << lex->getSourceRange() << rex->getSourceRange(); 1998 } else { 1999 Diag(Loc, diag::err_typecheck_arithmetic_incomplete_type) 2000 << lex->getType().getAsString() << lex->getSourceRange(); 2001 return QualType(); 2002 } 2003 } 2004 return PExp->getType(); 2005 } 2006 } 2007 2008 return InvalidOperands(Loc, lex, rex); 2009} 2010 2011// C99 6.5.6 2012QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 2013 SourceLocation Loc, bool isCompAssign) { 2014 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2015 return CheckVectorOperands(Loc, lex, rex); 2016 2017 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2018 2019 // Enforce type constraints: C99 6.5.6p3. 2020 2021 // Handle the common case first (both operands are arithmetic). 2022 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2023 return compType; 2024 2025 // Either ptr - int or ptr - ptr. 2026 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 2027 QualType lpointee = LHSPTy->getPointeeType(); 2028 2029 // The LHS must be an object type, not incomplete, function, etc. 2030 if (!lpointee->isObjectType()) { 2031 // Handle the GNU void* extension. 2032 if (lpointee->isVoidType()) { 2033 Diag(Loc, diag::ext_gnu_void_ptr) 2034 << lex->getSourceRange() << rex->getSourceRange(); 2035 } else { 2036 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2037 << lex->getType().getAsString() << lex->getSourceRange(); 2038 return QualType(); 2039 } 2040 } 2041 2042 // The result type of a pointer-int computation is the pointer type. 2043 if (rex->getType()->isIntegerType()) 2044 return lex->getType(); 2045 2046 // Handle pointer-pointer subtractions. 2047 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 2048 QualType rpointee = RHSPTy->getPointeeType(); 2049 2050 // RHS must be an object type, unless void (GNU). 2051 if (!rpointee->isObjectType()) { 2052 // Handle the GNU void* extension. 2053 if (rpointee->isVoidType()) { 2054 if (!lpointee->isVoidType()) 2055 Diag(Loc, diag::ext_gnu_void_ptr) 2056 << lex->getSourceRange() << rex->getSourceRange(); 2057 } else { 2058 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2059 << rex->getType().getAsString() << rex->getSourceRange(); 2060 return QualType(); 2061 } 2062 } 2063 2064 // Pointee types must be compatible. 2065 if (!Context.typesAreCompatible( 2066 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2067 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2068 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 2069 << lex->getType().getAsString() << rex->getType().getAsString() 2070 << lex->getSourceRange() << rex->getSourceRange(); 2071 return QualType(); 2072 } 2073 2074 return Context.getPointerDiffType(); 2075 } 2076 } 2077 2078 return InvalidOperands(Loc, lex, rex); 2079} 2080 2081// C99 6.5.7 2082QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2083 bool isCompAssign) { 2084 // C99 6.5.7p2: Each of the operands shall have integer type. 2085 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2086 return InvalidOperands(Loc, lex, rex); 2087 2088 // Shifts don't perform usual arithmetic conversions, they just do integer 2089 // promotions on each operand. C99 6.5.7p3 2090 if (!isCompAssign) 2091 UsualUnaryConversions(lex); 2092 UsualUnaryConversions(rex); 2093 2094 // "The type of the result is that of the promoted left operand." 2095 return lex->getType(); 2096} 2097 2098static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 2099 ASTContext& Context) { 2100 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2101 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2102 // ID acts sort of like void* for ObjC interfaces 2103 if (LHSIface && Context.isObjCIdType(RHS)) 2104 return true; 2105 if (RHSIface && Context.isObjCIdType(LHS)) 2106 return true; 2107 if (!LHSIface || !RHSIface) 2108 return false; 2109 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 2110 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 2111} 2112 2113// C99 6.5.8 2114QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2115 bool isRelational) { 2116 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2117 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 2118 2119 // C99 6.5.8p3 / C99 6.5.9p4 2120 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2121 UsualArithmeticConversions(lex, rex); 2122 else { 2123 UsualUnaryConversions(lex); 2124 UsualUnaryConversions(rex); 2125 } 2126 QualType lType = lex->getType(); 2127 QualType rType = rex->getType(); 2128 2129 // For non-floating point types, check for self-comparisons of the form 2130 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2131 // often indicate logic errors in the program. 2132 if (!lType->isFloatingType()) { 2133 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2134 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2135 if (DRL->getDecl() == DRR->getDecl()) 2136 Diag(Loc, diag::warn_selfcomparison); 2137 } 2138 2139 // The result of comparisons is 'bool' in C++, 'int' in C. 2140 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy : Context.IntTy; 2141 2142 if (isRelational) { 2143 if (lType->isRealType() && rType->isRealType()) 2144 return ResultTy; 2145 } else { 2146 // Check for comparisons of floating point operands using != and ==. 2147 if (lType->isFloatingType()) { 2148 assert (rType->isFloatingType()); 2149 CheckFloatComparison(Loc,lex,rex); 2150 } 2151 2152 if (lType->isArithmeticType() && rType->isArithmeticType()) 2153 return ResultTy; 2154 } 2155 2156 bool LHSIsNull = lex->isNullPointerConstant(Context); 2157 bool RHSIsNull = rex->isNullPointerConstant(Context); 2158 2159 // All of the following pointer related warnings are GCC extensions, except 2160 // when handling null pointer constants. One day, we can consider making them 2161 // errors (when -pedantic-errors is enabled). 2162 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2163 QualType LCanPointeeTy = 2164 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2165 QualType RCanPointeeTy = 2166 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2167 2168 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2169 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2170 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2171 RCanPointeeTy.getUnqualifiedType()) && 2172 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2173 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2174 << lType.getAsString() << rType.getAsString() 2175 << lex->getSourceRange() << rex->getSourceRange(); 2176 } 2177 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2178 return ResultTy; 2179 } 2180 // Handle block pointer types. 2181 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2182 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2183 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2184 2185 if (!LHSIsNull && !RHSIsNull && 2186 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2187 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2188 << lType.getAsString() << rType.getAsString() 2189 << lex->getSourceRange() << rex->getSourceRange(); 2190 } 2191 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2192 return ResultTy; 2193 } 2194 // Allow block pointers to be compared with null pointer constants. 2195 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2196 (lType->isPointerType() && rType->isBlockPointerType())) { 2197 if (!LHSIsNull && !RHSIsNull) { 2198 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2199 << lType.getAsString() << rType.getAsString() 2200 << lex->getSourceRange() << rex->getSourceRange(); 2201 } 2202 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2203 return ResultTy; 2204 } 2205 2206 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2207 if (lType->isPointerType() || rType->isPointerType()) { 2208 const PointerType *LPT = lType->getAsPointerType(); 2209 const PointerType *RPT = rType->getAsPointerType(); 2210 bool LPtrToVoid = LPT ? 2211 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 2212 bool RPtrToVoid = RPT ? 2213 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 2214 2215 if (!LPtrToVoid && !RPtrToVoid && 2216 !Context.typesAreCompatible(lType, rType)) { 2217 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2218 << lType.getAsString() << rType.getAsString() 2219 << lex->getSourceRange() << rex->getSourceRange(); 2220 ImpCastExprToType(rex, lType); 2221 return ResultTy; 2222 } 2223 ImpCastExprToType(rex, lType); 2224 return ResultTy; 2225 } 2226 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2227 ImpCastExprToType(rex, lType); 2228 return ResultTy; 2229 } else { 2230 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2231 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 2232 << lType.getAsString() << rType.getAsString() 2233 << lex->getSourceRange() << rex->getSourceRange(); 2234 ImpCastExprToType(rex, lType); 2235 return ResultTy; 2236 } 2237 } 2238 } 2239 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2240 rType->isIntegerType()) { 2241 if (!RHSIsNull) 2242 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2243 << lType.getAsString() << rType.getAsString() 2244 << lex->getSourceRange() << rex->getSourceRange(); 2245 ImpCastExprToType(rex, lType); // promote the integer to pointer 2246 return ResultTy; 2247 } 2248 if (lType->isIntegerType() && 2249 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2250 if (!LHSIsNull) 2251 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2252 << lType.getAsString() << rType.getAsString() 2253 << lex->getSourceRange() << rex->getSourceRange(); 2254 ImpCastExprToType(lex, rType); // promote the integer to pointer 2255 return ResultTy; 2256 } 2257 // Handle block pointers. 2258 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2259 if (!RHSIsNull) 2260 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2261 << lType.getAsString() << rType.getAsString() 2262 << lex->getSourceRange() << rex->getSourceRange(); 2263 ImpCastExprToType(rex, lType); // promote the integer to pointer 2264 return ResultTy; 2265 } 2266 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2267 if (!LHSIsNull) 2268 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2269 << lType.getAsString() << rType.getAsString() 2270 << lex->getSourceRange() << rex->getSourceRange(); 2271 ImpCastExprToType(lex, rType); // promote the integer to pointer 2272 return ResultTy; 2273 } 2274 return InvalidOperands(Loc, lex, rex); 2275} 2276 2277/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2278/// operates on extended vector types. Instead of producing an IntTy result, 2279/// like a scalar comparison, a vector comparison produces a vector of integer 2280/// types. 2281QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2282 SourceLocation Loc, 2283 bool isRelational) { 2284 // Check to make sure we're operating on vectors of the same type and width, 2285 // Allowing one side to be a scalar of element type. 2286 QualType vType = CheckVectorOperands(Loc, lex, rex); 2287 if (vType.isNull()) 2288 return vType; 2289 2290 QualType lType = lex->getType(); 2291 QualType rType = rex->getType(); 2292 2293 // For non-floating point types, check for self-comparisons of the form 2294 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2295 // often indicate logic errors in the program. 2296 if (!lType->isFloatingType()) { 2297 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2298 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2299 if (DRL->getDecl() == DRR->getDecl()) 2300 Diag(Loc, diag::warn_selfcomparison); 2301 } 2302 2303 // Check for comparisons of floating point operands using != and ==. 2304 if (!isRelational && lType->isFloatingType()) { 2305 assert (rType->isFloatingType()); 2306 CheckFloatComparison(Loc,lex,rex); 2307 } 2308 2309 // Return the type for the comparison, which is the same as vector type for 2310 // integer vectors, or an integer type of identical size and number of 2311 // elements for floating point vectors. 2312 if (lType->isIntegerType()) 2313 return lType; 2314 2315 const VectorType *VTy = lType->getAsVectorType(); 2316 2317 // FIXME: need to deal with non-32b int / non-64b long long 2318 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2319 if (TypeSize == 32) { 2320 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2321 } 2322 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2323 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2324} 2325 2326inline QualType Sema::CheckBitwiseOperands( 2327 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2328{ 2329 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2330 return CheckVectorOperands(Loc, lex, rex); 2331 2332 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2333 2334 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2335 return compType; 2336 return InvalidOperands(Loc, lex, rex); 2337} 2338 2339inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2340 Expr *&lex, Expr *&rex, SourceLocation Loc) 2341{ 2342 UsualUnaryConversions(lex); 2343 UsualUnaryConversions(rex); 2344 2345 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2346 return Context.IntTy; 2347 return InvalidOperands(Loc, lex, rex); 2348} 2349 2350/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 2351/// emit an error and return true. If so, return false. 2352static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 2353 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 2354 if (IsLV == Expr::MLV_Valid) 2355 return false; 2356 2357 unsigned Diag = 0; 2358 bool NeedType = false; 2359 switch (IsLV) { // C99 6.5.16p2 2360 default: assert(0 && "Unknown result from isModifiableLvalue!"); 2361 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 2362 case Expr::MLV_ArrayType: 2363 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 2364 NeedType = true; 2365 break; 2366 case Expr::MLV_NotObjectType: 2367 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 2368 NeedType = true; 2369 break; 2370 case Expr::MLV_LValueCast: 2371 Diag = diag::err_typecheck_lvalue_casts_not_supported; 2372 break; 2373 case Expr::MLV_InvalidExpression: 2374 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 2375 break; 2376 case Expr::MLV_IncompleteType: 2377 case Expr::MLV_IncompleteVoidType: 2378 Diag = diag::err_typecheck_incomplete_type_not_modifiable_lvalue; 2379 NeedType = true; 2380 break; 2381 case Expr::MLV_DuplicateVectorComponents: 2382 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 2383 break; 2384 case Expr::MLV_NotBlockQualified: 2385 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 2386 break; 2387 } 2388 2389 if (NeedType) 2390 S.Diag(Loc, Diag, E->getType().getAsString(), E->getSourceRange()); 2391 else 2392 S.Diag(Loc, Diag, E->getSourceRange()); 2393 return true; 2394} 2395 2396 2397 2398// C99 6.5.16.1 2399QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 2400 SourceLocation Loc, 2401 QualType CompoundType) { 2402 // Verify that LHS is a modifiable lvalue, and emit error if not. 2403 if (CheckForModifiableLvalue(LHS, Loc, *this)) 2404 return QualType(); 2405 2406 QualType LHSType = LHS->getType(); 2407 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 2408 2409 AssignConvertType ConvTy; 2410 if (CompoundType.isNull()) { 2411 // Simple assignment "x = y". 2412 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 2413 2414 // If the RHS is a unary plus or minus, check to see if they = and + are 2415 // right next to each other. If so, the user may have typo'd "x =+ 4" 2416 // instead of "x += 4". 2417 Expr *RHSCheck = RHS; 2418 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2419 RHSCheck = ICE->getSubExpr(); 2420 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2421 if ((UO->getOpcode() == UnaryOperator::Plus || 2422 UO->getOpcode() == UnaryOperator::Minus) && 2423 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 2424 // Only if the two operators are exactly adjacent. 2425 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2426 Diag(Loc, diag::warn_not_compound_assign, 2427 UO->getOpcode() == UnaryOperator::Plus ? "+" : "-", 2428 SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc())); 2429 } 2430 } else { 2431 // Compound assignment "x += y" 2432 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 2433 } 2434 2435 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 2436 RHS, "assigning")) 2437 return QualType(); 2438 2439 // C99 6.5.16p3: The type of an assignment expression is the type of the 2440 // left operand unless the left operand has qualified type, in which case 2441 // it is the unqualified version of the type of the left operand. 2442 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2443 // is converted to the type of the assignment expression (above). 2444 // C++ 5.17p1: the type of the assignment expression is that of its left 2445 // oprdu. 2446 return LHSType.getUnqualifiedType(); 2447} 2448 2449// C99 6.5.17 2450QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 2451 // FIXME: what is required for LHS? 2452 2453 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2454 DefaultFunctionArrayConversion(RHS); 2455 return RHS->getType(); 2456} 2457 2458/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2459/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2460QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 2461 QualType resType = op->getType(); 2462 assert(!resType.isNull() && "no type for increment/decrement expression"); 2463 2464 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2465 if (const PointerType *pt = resType->getAsPointerType()) { 2466 if (pt->getPointeeType()->isVoidType()) { 2467 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 2468 } else if (!pt->getPointeeType()->isObjectType()) { 2469 // C99 6.5.2.4p2, 6.5.6p2 2470 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 2471 resType.getAsString(), op->getSourceRange()); 2472 return QualType(); 2473 } 2474 } else if (!resType->isRealType()) { 2475 if (resType->isComplexType()) 2476 // C99 does not support ++/-- on complex types. 2477 Diag(OpLoc, diag::ext_integer_increment_complex, 2478 resType.getAsString(), op->getSourceRange()); 2479 else { 2480 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 2481 resType.getAsString(), op->getSourceRange()); 2482 return QualType(); 2483 } 2484 } 2485 // At this point, we know we have a real, complex or pointer type. 2486 // Now make sure the operand is a modifiable lvalue. 2487 if (CheckForModifiableLvalue(op, OpLoc, *this)) 2488 return QualType(); 2489 return resType; 2490} 2491 2492/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2493/// This routine allows us to typecheck complex/recursive expressions 2494/// where the declaration is needed for type checking. We only need to 2495/// handle cases when the expression references a function designator 2496/// or is an lvalue. Here are some examples: 2497/// - &(x) => x 2498/// - &*****f => f for f a function designator. 2499/// - &s.xx => s 2500/// - &s.zz[1].yy -> s, if zz is an array 2501/// - *(x + 1) -> x, if x is an array 2502/// - &"123"[2] -> 0 2503/// - & __real__ x -> x 2504static NamedDecl *getPrimaryDecl(Expr *E) { 2505 switch (E->getStmtClass()) { 2506 case Stmt::DeclRefExprClass: 2507 return cast<DeclRefExpr>(E)->getDecl(); 2508 case Stmt::MemberExprClass: 2509 // Fields cannot be declared with a 'register' storage class. 2510 // &X->f is always ok, even if X is declared register. 2511 if (cast<MemberExpr>(E)->isArrow()) 2512 return 0; 2513 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2514 case Stmt::ArraySubscriptExprClass: { 2515 // &X[4] and &4[X] refers to X if X is not a pointer. 2516 2517 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2518 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 2519 if (!VD || VD->getType()->isPointerType()) 2520 return 0; 2521 else 2522 return VD; 2523 } 2524 case Stmt::UnaryOperatorClass: { 2525 UnaryOperator *UO = cast<UnaryOperator>(E); 2526 2527 switch(UO->getOpcode()) { 2528 case UnaryOperator::Deref: { 2529 // *(X + 1) refers to X if X is not a pointer. 2530 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 2531 ValueDecl *VD = dyn_cast<ValueDecl>(D); 2532 if (!VD || VD->getType()->isPointerType()) 2533 return 0; 2534 return VD; 2535 } 2536 return 0; 2537 } 2538 case UnaryOperator::Real: 2539 case UnaryOperator::Imag: 2540 case UnaryOperator::Extension: 2541 return getPrimaryDecl(UO->getSubExpr()); 2542 default: 2543 return 0; 2544 } 2545 } 2546 case Stmt::BinaryOperatorClass: { 2547 BinaryOperator *BO = cast<BinaryOperator>(E); 2548 2549 // Handle cases involving pointer arithmetic. The result of an 2550 // Assign or AddAssign is not an lvalue so they can be ignored. 2551 2552 // (x + n) or (n + x) => x 2553 if (BO->getOpcode() == BinaryOperator::Add) { 2554 if (BO->getLHS()->getType()->isPointerType()) { 2555 return getPrimaryDecl(BO->getLHS()); 2556 } else if (BO->getRHS()->getType()->isPointerType()) { 2557 return getPrimaryDecl(BO->getRHS()); 2558 } 2559 } 2560 2561 return 0; 2562 } 2563 case Stmt::ParenExprClass: 2564 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2565 case Stmt::ImplicitCastExprClass: 2566 // &X[4] when X is an array, has an implicit cast from array to pointer. 2567 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2568 default: 2569 return 0; 2570 } 2571} 2572 2573/// CheckAddressOfOperand - The operand of & must be either a function 2574/// designator or an lvalue designating an object. If it is an lvalue, the 2575/// object cannot be declared with storage class register or be a bit field. 2576/// Note: The usual conversions are *not* applied to the operand of the & 2577/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2578/// In C++, the operand might be an overloaded function name, in which case 2579/// we allow the '&' but retain the overloaded-function type. 2580QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2581 if (getLangOptions().C99) { 2582 // Implement C99-only parts of addressof rules. 2583 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2584 if (uOp->getOpcode() == UnaryOperator::Deref) 2585 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2586 // (assuming the deref expression is valid). 2587 return uOp->getSubExpr()->getType(); 2588 } 2589 // Technically, there should be a check for array subscript 2590 // expressions here, but the result of one is always an lvalue anyway. 2591 } 2592 NamedDecl *dcl = getPrimaryDecl(op); 2593 Expr::isLvalueResult lval = op->isLvalue(Context); 2594 2595 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2596 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2597 // FIXME: emit more specific diag... 2598 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 2599 op->getSourceRange()); 2600 return QualType(); 2601 } 2602 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2603 if (MemExpr->getMemberDecl()->isBitField()) { 2604 Diag(OpLoc, diag::err_typecheck_address_of, 2605 std::string("bit-field"), op->getSourceRange()); 2606 return QualType(); 2607 } 2608 // Check for Apple extension for accessing vector components. 2609 } else if (isa<ArraySubscriptExpr>(op) && 2610 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2611 Diag(OpLoc, diag::err_typecheck_address_of, 2612 std::string("vector"), op->getSourceRange()); 2613 return QualType(); 2614 } else if (dcl) { // C99 6.5.3.2p1 2615 // We have an lvalue with a decl. Make sure the decl is not declared 2616 // with the register storage-class specifier. 2617 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2618 if (vd->getStorageClass() == VarDecl::Register) { 2619 Diag(OpLoc, diag::err_typecheck_address_of, 2620 std::string("register variable"), op->getSourceRange()); 2621 return QualType(); 2622 } 2623 } else if (isa<OverloadedFunctionDecl>(dcl)) 2624 return Context.OverloadTy; 2625 else 2626 assert(0 && "Unknown/unexpected decl type"); 2627 } 2628 2629 // If the operand has type "type", the result has type "pointer to type". 2630 return Context.getPointerType(op->getType()); 2631} 2632 2633QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 2634 UsualUnaryConversions(op); 2635 QualType qType = op->getType(); 2636 2637 if (const PointerType *PT = qType->getAsPointerType()) { 2638 // Note that per both C89 and C99, this is always legal, even 2639 // if ptype is an incomplete type or void. 2640 // It would be possible to warn about dereferencing a 2641 // void pointer, but it's completely well-defined, 2642 // and such a warning is unlikely to catch any mistakes. 2643 return PT->getPointeeType(); 2644 } 2645 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 2646 qType.getAsString(), op->getSourceRange()); 2647 return QualType(); 2648} 2649 2650static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2651 tok::TokenKind Kind) { 2652 BinaryOperator::Opcode Opc; 2653 switch (Kind) { 2654 default: assert(0 && "Unknown binop!"); 2655 case tok::star: Opc = BinaryOperator::Mul; break; 2656 case tok::slash: Opc = BinaryOperator::Div; break; 2657 case tok::percent: Opc = BinaryOperator::Rem; break; 2658 case tok::plus: Opc = BinaryOperator::Add; break; 2659 case tok::minus: Opc = BinaryOperator::Sub; break; 2660 case tok::lessless: Opc = BinaryOperator::Shl; break; 2661 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2662 case tok::lessequal: Opc = BinaryOperator::LE; break; 2663 case tok::less: Opc = BinaryOperator::LT; break; 2664 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2665 case tok::greater: Opc = BinaryOperator::GT; break; 2666 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2667 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2668 case tok::amp: Opc = BinaryOperator::And; break; 2669 case tok::caret: Opc = BinaryOperator::Xor; break; 2670 case tok::pipe: Opc = BinaryOperator::Or; break; 2671 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2672 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2673 case tok::equal: Opc = BinaryOperator::Assign; break; 2674 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2675 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2676 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2677 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2678 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2679 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2680 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2681 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2682 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2683 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2684 case tok::comma: Opc = BinaryOperator::Comma; break; 2685 } 2686 return Opc; 2687} 2688 2689static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2690 tok::TokenKind Kind) { 2691 UnaryOperator::Opcode Opc; 2692 switch (Kind) { 2693 default: assert(0 && "Unknown unary op!"); 2694 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2695 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2696 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2697 case tok::star: Opc = UnaryOperator::Deref; break; 2698 case tok::plus: Opc = UnaryOperator::Plus; break; 2699 case tok::minus: Opc = UnaryOperator::Minus; break; 2700 case tok::tilde: Opc = UnaryOperator::Not; break; 2701 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2702 case tok::kw___real: Opc = UnaryOperator::Real; break; 2703 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2704 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2705 } 2706 return Opc; 2707} 2708 2709/// CreateBuiltinBinOp - Creates a new built-in binary operation with 2710/// operator @p Opc at location @c TokLoc. This routine only supports 2711/// built-in operations; ActOnBinOp handles overloaded operators. 2712Action::ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 2713 unsigned Op, 2714 Expr *lhs, Expr *rhs) { 2715 QualType ResultTy; // Result type of the binary operator. 2716 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2717 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 2718 2719 switch (Opc) { 2720 default: 2721 assert(0 && "Unknown binary expr!"); 2722 case BinaryOperator::Assign: 2723 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 2724 break; 2725 case BinaryOperator::Mul: 2726 case BinaryOperator::Div: 2727 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 2728 break; 2729 case BinaryOperator::Rem: 2730 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 2731 break; 2732 case BinaryOperator::Add: 2733 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 2734 break; 2735 case BinaryOperator::Sub: 2736 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 2737 break; 2738 case BinaryOperator::Shl: 2739 case BinaryOperator::Shr: 2740 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 2741 break; 2742 case BinaryOperator::LE: 2743 case BinaryOperator::LT: 2744 case BinaryOperator::GE: 2745 case BinaryOperator::GT: 2746 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 2747 break; 2748 case BinaryOperator::EQ: 2749 case BinaryOperator::NE: 2750 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 2751 break; 2752 case BinaryOperator::And: 2753 case BinaryOperator::Xor: 2754 case BinaryOperator::Or: 2755 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 2756 break; 2757 case BinaryOperator::LAnd: 2758 case BinaryOperator::LOr: 2759 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 2760 break; 2761 case BinaryOperator::MulAssign: 2762 case BinaryOperator::DivAssign: 2763 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 2764 if (!CompTy.isNull()) 2765 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2766 break; 2767 case BinaryOperator::RemAssign: 2768 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 2769 if (!CompTy.isNull()) 2770 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2771 break; 2772 case BinaryOperator::AddAssign: 2773 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 2774 if (!CompTy.isNull()) 2775 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2776 break; 2777 case BinaryOperator::SubAssign: 2778 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 2779 if (!CompTy.isNull()) 2780 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2781 break; 2782 case BinaryOperator::ShlAssign: 2783 case BinaryOperator::ShrAssign: 2784 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 2785 if (!CompTy.isNull()) 2786 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2787 break; 2788 case BinaryOperator::AndAssign: 2789 case BinaryOperator::XorAssign: 2790 case BinaryOperator::OrAssign: 2791 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 2792 if (!CompTy.isNull()) 2793 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2794 break; 2795 case BinaryOperator::Comma: 2796 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 2797 break; 2798 } 2799 if (ResultTy.isNull()) 2800 return true; 2801 if (CompTy.isNull()) 2802 return new BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc); 2803 else 2804 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, OpLoc); 2805} 2806 2807// Binary Operators. 'Tok' is the token for the operator. 2808Action::ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 2809 tok::TokenKind Kind, 2810 ExprTy *LHS, ExprTy *RHS) { 2811 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 2812 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 2813 2814 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 2815 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 2816 2817 if (getLangOptions().CPlusPlus && 2818 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 2819 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 2820 // If this is one of the assignment operators, we only perform 2821 // overload resolution if the left-hand side is a class or 2822 // enumeration type (C++ [expr.ass]p3). 2823 if (Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign && 2824 !(lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType())) { 2825 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 2826 } 2827 2828 // C++ [over.binary]p1: 2829 // A binary operator shall be implemented either by a non-static 2830 // member function (9.3) with one parameter or by a non-member 2831 // function with two parameters. Thus, for any binary operator 2832 // @, x@y can be interpreted as either x.operator@(y) or 2833 // operator@(x,y). If both forms of the operator function have 2834 // been declared, the rules in 13.3.1.2 determines which, if 2835 // any, interpretation is used. 2836 OverloadCandidateSet CandidateSet; 2837 2838 // Determine which overloaded operator we're dealing with. 2839 static const OverloadedOperatorKind OverOps[] = { 2840 OO_Star, OO_Slash, OO_Percent, 2841 OO_Plus, OO_Minus, 2842 OO_LessLess, OO_GreaterGreater, 2843 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 2844 OO_EqualEqual, OO_ExclaimEqual, 2845 OO_Amp, 2846 OO_Caret, 2847 OO_Pipe, 2848 OO_AmpAmp, 2849 OO_PipePipe, 2850 OO_Equal, OO_StarEqual, 2851 OO_SlashEqual, OO_PercentEqual, 2852 OO_PlusEqual, OO_MinusEqual, 2853 OO_LessLessEqual, OO_GreaterGreaterEqual, 2854 OO_AmpEqual, OO_CaretEqual, 2855 OO_PipeEqual, 2856 OO_Comma 2857 }; 2858 OverloadedOperatorKind OverOp = OverOps[Opc]; 2859 2860 // Add the appropriate overloaded operators (C++ [over.match.oper]) 2861 // to the candidate set. 2862 Expr *Args[2] = { lhs, rhs }; 2863 AddOperatorCandidates(OverOp, S, Args, 2, CandidateSet); 2864 2865 // Perform overload resolution. 2866 OverloadCandidateSet::iterator Best; 2867 switch (BestViableFunction(CandidateSet, Best)) { 2868 case OR_Success: { 2869 // We found a built-in operator or an overloaded operator. 2870 FunctionDecl *FnDecl = Best->Function; 2871 2872 if (FnDecl) { 2873 // We matched an overloaded operator. Build a call to that 2874 // operator. 2875 2876 // Convert the arguments. 2877 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 2878 if (PerformObjectArgumentInitialization(lhs, Method) || 2879 PerformCopyInitialization(rhs, FnDecl->getParamDecl(0)->getType(), 2880 "passing")) 2881 return true; 2882 } else { 2883 // Convert the arguments. 2884 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 2885 "passing") || 2886 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 2887 "passing")) 2888 return true; 2889 } 2890 2891 // Determine the result type 2892 QualType ResultTy 2893 = FnDecl->getType()->getAsFunctionType()->getResultType(); 2894 ResultTy = ResultTy.getNonReferenceType(); 2895 2896 // Build the actual expression node. 2897 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 2898 SourceLocation()); 2899 UsualUnaryConversions(FnExpr); 2900 2901 Expr *Args[2] = { lhs, rhs }; 2902 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, TokLoc); 2903 } else { 2904 // We matched a built-in operator. Convert the arguments, then 2905 // break out so that we will build the appropriate built-in 2906 // operator node. 2907 if (PerformCopyInitialization(lhs, Best->BuiltinTypes.ParamTypes[0], 2908 "passing") || 2909 PerformCopyInitialization(rhs, Best->BuiltinTypes.ParamTypes[1], 2910 "passing")) 2911 return true; 2912 2913 break; 2914 } 2915 } 2916 2917 case OR_No_Viable_Function: 2918 // No viable function; fall through to handling this as a 2919 // built-in operator, which will produce an error message for us. 2920 break; 2921 2922 case OR_Ambiguous: 2923 Diag(TokLoc, diag::err_ovl_ambiguous_oper) 2924 << BinaryOperator::getOpcodeStr(Opc) 2925 << lhs->getSourceRange() << rhs->getSourceRange(); 2926 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2927 return true; 2928 } 2929 2930 // Either we found no viable overloaded operator or we matched a 2931 // built-in operator. In either case, fall through to trying to 2932 // build a built-in operation. 2933 } 2934 2935 2936 // Build a built-in binary operation. 2937 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 2938} 2939 2940// Unary Operators. 'Tok' is the token for the operator. 2941Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2942 ExprTy *input) { 2943 Expr *Input = (Expr*)input; 2944 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2945 QualType resultType; 2946 switch (Opc) { 2947 default: 2948 assert(0 && "Unimplemented unary expr!"); 2949 case UnaryOperator::PreInc: 2950 case UnaryOperator::PreDec: 2951 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2952 break; 2953 case UnaryOperator::AddrOf: 2954 resultType = CheckAddressOfOperand(Input, OpLoc); 2955 break; 2956 case UnaryOperator::Deref: 2957 DefaultFunctionArrayConversion(Input); 2958 resultType = CheckIndirectionOperand(Input, OpLoc); 2959 break; 2960 case UnaryOperator::Plus: 2961 case UnaryOperator::Minus: 2962 UsualUnaryConversions(Input); 2963 resultType = Input->getType(); 2964 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2965 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2966 resultType.getAsString()); 2967 break; 2968 case UnaryOperator::Not: // bitwise complement 2969 UsualUnaryConversions(Input); 2970 resultType = Input->getType(); 2971 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 2972 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 2973 // C99 does not support '~' for complex conjugation. 2974 Diag(OpLoc, diag::ext_integer_complement_complex, 2975 resultType.getAsString(), Input->getSourceRange()); 2976 else if (!resultType->isIntegerType()) 2977 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2978 resultType.getAsString(), Input->getSourceRange()); 2979 break; 2980 case UnaryOperator::LNot: // logical negation 2981 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2982 DefaultFunctionArrayConversion(Input); 2983 resultType = Input->getType(); 2984 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2985 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2986 resultType.getAsString()); 2987 // LNot always has type int. C99 6.5.3.3p5. 2988 resultType = Context.IntTy; 2989 break; 2990 case UnaryOperator::Real: 2991 case UnaryOperator::Imag: 2992 resultType = CheckRealImagOperand(Input, OpLoc); 2993 break; 2994 case UnaryOperator::Extension: 2995 resultType = Input->getType(); 2996 break; 2997 } 2998 if (resultType.isNull()) 2999 return true; 3000 return new UnaryOperator(Input, Opc, resultType, OpLoc); 3001} 3002 3003/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 3004Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 3005 SourceLocation LabLoc, 3006 IdentifierInfo *LabelII) { 3007 // Look up the record for this label identifier. 3008 LabelStmt *&LabelDecl = LabelMap[LabelII]; 3009 3010 // If we haven't seen this label yet, create a forward reference. It 3011 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 3012 if (LabelDecl == 0) 3013 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 3014 3015 // Create the AST node. The address of a label always has type 'void*'. 3016 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 3017 Context.getPointerType(Context.VoidTy)); 3018} 3019 3020Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 3021 SourceLocation RPLoc) { // "({..})" 3022 Stmt *SubStmt = static_cast<Stmt*>(substmt); 3023 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 3024 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 3025 3026 // FIXME: there are a variety of strange constraints to enforce here, for 3027 // example, it is not possible to goto into a stmt expression apparently. 3028 // More semantic analysis is needed. 3029 3030 // FIXME: the last statement in the compount stmt has its value used. We 3031 // should not warn about it being unused. 3032 3033 // If there are sub stmts in the compound stmt, take the type of the last one 3034 // as the type of the stmtexpr. 3035 QualType Ty = Context.VoidTy; 3036 3037 if (!Compound->body_empty()) { 3038 Stmt *LastStmt = Compound->body_back(); 3039 // If LastStmt is a label, skip down through into the body. 3040 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 3041 LastStmt = Label->getSubStmt(); 3042 3043 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 3044 Ty = LastExpr->getType(); 3045 } 3046 3047 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 3048} 3049 3050Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 3051 SourceLocation TypeLoc, 3052 TypeTy *argty, 3053 OffsetOfComponent *CompPtr, 3054 unsigned NumComponents, 3055 SourceLocation RPLoc) { 3056 QualType ArgTy = QualType::getFromOpaquePtr(argty); 3057 assert(!ArgTy.isNull() && "Missing type argument!"); 3058 3059 // We must have at least one component that refers to the type, and the first 3060 // one is known to be a field designator. Verify that the ArgTy represents 3061 // a struct/union/class. 3062 if (!ArgTy->isRecordType()) 3063 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 3064 3065 // Otherwise, create a compound literal expression as the base, and 3066 // iteratively process the offsetof designators. 3067 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 3068 3069 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 3070 // GCC extension, diagnose them. 3071 if (NumComponents != 1) 3072 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 3073 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 3074 3075 for (unsigned i = 0; i != NumComponents; ++i) { 3076 const OffsetOfComponent &OC = CompPtr[i]; 3077 if (OC.isBrackets) { 3078 // Offset of an array sub-field. TODO: Should we allow vector elements? 3079 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 3080 if (!AT) { 3081 delete Res; 3082 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 3083 Res->getType().getAsString()); 3084 } 3085 3086 // FIXME: C++: Verify that operator[] isn't overloaded. 3087 3088 // C99 6.5.2.1p1 3089 Expr *Idx = static_cast<Expr*>(OC.U.E); 3090 if (!Idx->getType()->isIntegerType()) 3091 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 3092 Idx->getSourceRange()); 3093 3094 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 3095 continue; 3096 } 3097 3098 const RecordType *RC = Res->getType()->getAsRecordType(); 3099 if (!RC) { 3100 delete Res; 3101 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 3102 Res->getType().getAsString()); 3103 } 3104 3105 // Get the decl corresponding to this. 3106 RecordDecl *RD = RC->getDecl(); 3107 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 3108 if (!MemberDecl) 3109 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 3110 OC.U.IdentInfo->getName(), 3111 SourceRange(OC.LocStart, OC.LocEnd)); 3112 3113 // FIXME: C++: Verify that MemberDecl isn't a static field. 3114 // FIXME: Verify that MemberDecl isn't a bitfield. 3115 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 3116 // matter here. 3117 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, 3118 MemberDecl->getType().getNonReferenceType()); 3119 } 3120 3121 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 3122 BuiltinLoc); 3123} 3124 3125 3126Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 3127 TypeTy *arg1, TypeTy *arg2, 3128 SourceLocation RPLoc) { 3129 QualType argT1 = QualType::getFromOpaquePtr(arg1); 3130 QualType argT2 = QualType::getFromOpaquePtr(arg2); 3131 3132 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 3133 3134 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 3135} 3136 3137Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 3138 ExprTy *expr1, ExprTy *expr2, 3139 SourceLocation RPLoc) { 3140 Expr *CondExpr = static_cast<Expr*>(cond); 3141 Expr *LHSExpr = static_cast<Expr*>(expr1); 3142 Expr *RHSExpr = static_cast<Expr*>(expr2); 3143 3144 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 3145 3146 // The conditional expression is required to be a constant expression. 3147 llvm::APSInt condEval(32); 3148 SourceLocation ExpLoc; 3149 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 3150 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 3151 CondExpr->getSourceRange()); 3152 3153 // If the condition is > zero, then the AST type is the same as the LSHExpr. 3154 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 3155 RHSExpr->getType(); 3156 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 3157} 3158 3159//===----------------------------------------------------------------------===// 3160// Clang Extensions. 3161//===----------------------------------------------------------------------===// 3162 3163/// ActOnBlockStart - This callback is invoked when a block literal is started. 3164void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 3165 // Analyze block parameters. 3166 BlockSemaInfo *BSI = new BlockSemaInfo(); 3167 3168 // Add BSI to CurBlock. 3169 BSI->PrevBlockInfo = CurBlock; 3170 CurBlock = BSI; 3171 3172 BSI->ReturnType = 0; 3173 BSI->TheScope = BlockScope; 3174 3175 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 3176 PushDeclContext(BSI->TheDecl); 3177} 3178 3179void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 3180 // Analyze arguments to block. 3181 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 3182 "Not a function declarator!"); 3183 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 3184 3185 CurBlock->hasPrototype = FTI.hasPrototype; 3186 CurBlock->isVariadic = true; 3187 3188 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 3189 // no arguments, not a function that takes a single void argument. 3190 if (FTI.hasPrototype && 3191 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3192 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 3193 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 3194 // empty arg list, don't push any params. 3195 CurBlock->isVariadic = false; 3196 } else if (FTI.hasPrototype) { 3197 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 3198 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 3199 CurBlock->isVariadic = FTI.isVariadic; 3200 } 3201 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 3202 3203 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 3204 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 3205 // If this has an identifier, add it to the scope stack. 3206 if ((*AI)->getIdentifier()) 3207 PushOnScopeChains(*AI, CurBlock->TheScope); 3208} 3209 3210/// ActOnBlockError - If there is an error parsing a block, this callback 3211/// is invoked to pop the information about the block from the action impl. 3212void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 3213 // Ensure that CurBlock is deleted. 3214 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 3215 3216 // Pop off CurBlock, handle nested blocks. 3217 CurBlock = CurBlock->PrevBlockInfo; 3218 3219 // FIXME: Delete the ParmVarDecl objects as well??? 3220 3221} 3222 3223/// ActOnBlockStmtExpr - This is called when the body of a block statement 3224/// literal was successfully completed. ^(int x){...} 3225Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 3226 Scope *CurScope) { 3227 // Ensure that CurBlock is deleted. 3228 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 3229 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 3230 3231 PopDeclContext(); 3232 3233 // Pop off CurBlock, handle nested blocks. 3234 CurBlock = CurBlock->PrevBlockInfo; 3235 3236 QualType RetTy = Context.VoidTy; 3237 if (BSI->ReturnType) 3238 RetTy = QualType(BSI->ReturnType, 0); 3239 3240 llvm::SmallVector<QualType, 8> ArgTypes; 3241 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 3242 ArgTypes.push_back(BSI->Params[i]->getType()); 3243 3244 QualType BlockTy; 3245 if (!BSI->hasPrototype) 3246 BlockTy = Context.getFunctionTypeNoProto(RetTy); 3247 else 3248 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 3249 BSI->isVariadic, 0); 3250 3251 BlockTy = Context.getBlockPointerType(BlockTy); 3252 3253 BSI->TheDecl->setBody(Body.take()); 3254 return new BlockExpr(BSI->TheDecl, BlockTy); 3255} 3256 3257/// ExprsMatchFnType - return true if the Exprs in array Args have 3258/// QualTypes that match the QualTypes of the arguments of the FnType. 3259/// The number of arguments has already been validated to match the number of 3260/// arguments in FnType. 3261static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 3262 ASTContext &Context) { 3263 unsigned NumParams = FnType->getNumArgs(); 3264 for (unsigned i = 0; i != NumParams; ++i) { 3265 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 3266 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 3267 3268 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 3269 return false; 3270 } 3271 return true; 3272} 3273 3274Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 3275 SourceLocation *CommaLocs, 3276 SourceLocation BuiltinLoc, 3277 SourceLocation RParenLoc) { 3278 // __builtin_overload requires at least 2 arguments 3279 if (NumArgs < 2) 3280 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3281 SourceRange(BuiltinLoc, RParenLoc)); 3282 3283 // The first argument is required to be a constant expression. It tells us 3284 // the number of arguments to pass to each of the functions to be overloaded. 3285 Expr **Args = reinterpret_cast<Expr**>(args); 3286 Expr *NParamsExpr = Args[0]; 3287 llvm::APSInt constEval(32); 3288 SourceLocation ExpLoc; 3289 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 3290 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3291 NParamsExpr->getSourceRange()); 3292 3293 // Verify that the number of parameters is > 0 3294 unsigned NumParams = constEval.getZExtValue(); 3295 if (NumParams == 0) 3296 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3297 NParamsExpr->getSourceRange()); 3298 // Verify that we have at least 1 + NumParams arguments to the builtin. 3299 if ((NumParams + 1) > NumArgs) 3300 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3301 SourceRange(BuiltinLoc, RParenLoc)); 3302 3303 // Figure out the return type, by matching the args to one of the functions 3304 // listed after the parameters. 3305 OverloadExpr *OE = 0; 3306 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 3307 // UsualUnaryConversions will convert the function DeclRefExpr into a 3308 // pointer to function. 3309 Expr *Fn = UsualUnaryConversions(Args[i]); 3310 const FunctionTypeProto *FnType = 0; 3311 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3312 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3313 3314 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3315 // parameters, and the number of parameters must match the value passed to 3316 // the builtin. 3317 if (!FnType || (FnType->getNumArgs() != NumParams)) 3318 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 3319 Fn->getSourceRange()); 3320 3321 // Scan the parameter list for the FunctionType, checking the QualType of 3322 // each parameter against the QualTypes of the arguments to the builtin. 3323 // If they match, return a new OverloadExpr. 3324 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3325 if (OE) 3326 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 3327 OE->getFn()->getSourceRange()); 3328 // Remember our match, and continue processing the remaining arguments 3329 // to catch any errors. 3330 OE = new OverloadExpr(Args, NumArgs, i, 3331 FnType->getResultType().getNonReferenceType(), 3332 BuiltinLoc, RParenLoc); 3333 } 3334 } 3335 // Return the newly created OverloadExpr node, if we succeded in matching 3336 // exactly one of the candidate functions. 3337 if (OE) 3338 return OE; 3339 3340 // If we didn't find a matching function Expr in the __builtin_overload list 3341 // the return an error. 3342 std::string typeNames; 3343 for (unsigned i = 0; i != NumParams; ++i) { 3344 if (i != 0) typeNames += ", "; 3345 typeNames += Args[i+1]->getType().getAsString(); 3346 } 3347 3348 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 3349 SourceRange(BuiltinLoc, RParenLoc)); 3350} 3351 3352Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3353 ExprTy *expr, TypeTy *type, 3354 SourceLocation RPLoc) { 3355 Expr *E = static_cast<Expr*>(expr); 3356 QualType T = QualType::getFromOpaquePtr(type); 3357 3358 InitBuiltinVaListType(); 3359 3360 // Get the va_list type 3361 QualType VaListType = Context.getBuiltinVaListType(); 3362 // Deal with implicit array decay; for example, on x86-64, 3363 // va_list is an array, but it's supposed to decay to 3364 // a pointer for va_arg. 3365 if (VaListType->isArrayType()) 3366 VaListType = Context.getArrayDecayedType(VaListType); 3367 // Make sure the input expression also decays appropriately. 3368 UsualUnaryConversions(E); 3369 3370 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3371 return Diag(E->getLocStart(), 3372 diag::err_first_argument_to_va_arg_not_of_type_va_list, 3373 E->getType().getAsString(), 3374 E->getSourceRange()); 3375 3376 // FIXME: Warn if a non-POD type is passed in. 3377 3378 return new VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 3379} 3380 3381bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3382 SourceLocation Loc, 3383 QualType DstType, QualType SrcType, 3384 Expr *SrcExpr, const char *Flavor) { 3385 // Decode the result (notice that AST's are still created for extensions). 3386 bool isInvalid = false; 3387 unsigned DiagKind; 3388 switch (ConvTy) { 3389 default: assert(0 && "Unknown conversion type"); 3390 case Compatible: return false; 3391 case PointerToInt: 3392 DiagKind = diag::ext_typecheck_convert_pointer_int; 3393 break; 3394 case IntToPointer: 3395 DiagKind = diag::ext_typecheck_convert_int_pointer; 3396 break; 3397 case IncompatiblePointer: 3398 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3399 break; 3400 case FunctionVoidPointer: 3401 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3402 break; 3403 case CompatiblePointerDiscardsQualifiers: 3404 // If the qualifiers lost were because we were applying the 3405 // (deprecated) C++ conversion from a string literal to a char* 3406 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3407 // Ideally, this check would be performed in 3408 // CheckPointerTypesForAssignment. However, that would require a 3409 // bit of refactoring (so that the second argument is an 3410 // expression, rather than a type), which should be done as part 3411 // of a larger effort to fix CheckPointerTypesForAssignment for 3412 // C++ semantics. 3413 if (getLangOptions().CPlusPlus && 3414 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3415 return false; 3416 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3417 break; 3418 case IntToBlockPointer: 3419 DiagKind = diag::err_int_to_block_pointer; 3420 break; 3421 case IncompatibleBlockPointer: 3422 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3423 break; 3424 case BlockVoidPointer: 3425 DiagKind = diag::ext_typecheck_convert_pointer_void_block; 3426 break; 3427 case IncompatibleObjCQualifiedId: 3428 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3429 // it can give a more specific diagnostic. 3430 DiagKind = diag::warn_incompatible_qualified_id; 3431 break; 3432 case Incompatible: 3433 DiagKind = diag::err_typecheck_convert_incompatible; 3434 isInvalid = true; 3435 break; 3436 } 3437 3438 Diag(Loc, DiagKind) << DstType.getAsString() << SrcType.getAsString() 3439 << Flavor << SrcExpr->getSourceRange(); 3440 return isInvalid; 3441} 3442