SemaExpr.cpp revision 2c21a073525cdfa68e4439b7af551385dc2796ab
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->isStr("super")) { 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(Scope *S, SourceLocation OpLoc, 756 tok::TokenKind Kind, 757 ExprTy *Input) { 758 Expr *Arg = (Expr *)Input; 759 760 UnaryOperator::Opcode Opc; 761 switch (Kind) { 762 default: assert(0 && "Unknown unary op!"); 763 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 764 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 765 } 766 767 if (getLangOptions().CPlusPlus && 768 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 769 // Which overloaded operator? 770 OverloadedOperatorKind OverOp = 771 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 772 773 // C++ [over.inc]p1: 774 // 775 // [...] If the function is a member function with one 776 // parameter (which shall be of type int) or a non-member 777 // function with two parameters (the second of which shall be 778 // of type int), it defines the postfix increment operator ++ 779 // for objects of that type. When the postfix increment is 780 // called as a result of using the ++ operator, the int 781 // argument will have value zero. 782 Expr *Args[2] = { 783 Arg, 784 new IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 785 /*isSigned=*/true), 786 Context.IntTy, SourceLocation()) 787 }; 788 789 // Build the candidate set for overloading 790 OverloadCandidateSet CandidateSet; 791 AddOperatorCandidates(OverOp, S, Args, 2, CandidateSet); 792 793 // Perform overload resolution. 794 OverloadCandidateSet::iterator Best; 795 switch (BestViableFunction(CandidateSet, Best)) { 796 case OR_Success: { 797 // We found a built-in operator or an overloaded operator. 798 FunctionDecl *FnDecl = Best->Function; 799 800 if (FnDecl) { 801 // We matched an overloaded operator. Build a call to that 802 // operator. 803 804 // Convert the arguments. 805 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 806 if (PerformObjectArgumentInitialization(Arg, Method)) 807 return true; 808 } else { 809 // Convert the arguments. 810 if (PerformCopyInitialization(Arg, 811 FnDecl->getParamDecl(0)->getType(), 812 "passing")) 813 return true; 814 } 815 816 // Determine the result type 817 QualType ResultTy 818 = FnDecl->getType()->getAsFunctionType()->getResultType(); 819 ResultTy = ResultTy.getNonReferenceType(); 820 821 // Build the actual expression node. 822 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 823 SourceLocation()); 824 UsualUnaryConversions(FnExpr); 825 826 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, OpLoc); 827 } else { 828 // We matched a built-in operator. Convert the arguments, then 829 // break out so that we will build the appropriate built-in 830 // operator node. 831 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 832 "passing")) 833 return true; 834 835 break; 836 } 837 } 838 839 case OR_No_Viable_Function: 840 // No viable function; fall through to handling this as a 841 // built-in operator, which will produce an error message for us. 842 break; 843 844 case OR_Ambiguous: 845 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 846 << UnaryOperator::getOpcodeStr(Opc) 847 << Arg->getSourceRange(); 848 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 849 return true; 850 } 851 852 // Either we found no viable overloaded operator or we matched a 853 // built-in operator. In either case, fall through to trying to 854 // build a built-in operation. 855 } 856 857 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc); 858 if (result.isNull()) 859 return true; 860 return new UnaryOperator(Arg, Opc, result, OpLoc); 861} 862 863Action::ExprResult Sema:: 864ActOnArraySubscriptExpr(Scope *S, ExprTy *Base, SourceLocation LLoc, 865 ExprTy *Idx, SourceLocation RLoc) { 866 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 867 868 if (getLangOptions().CPlusPlus && 869 LHSExp->getType()->isRecordType() || 870 LHSExp->getType()->isEnumeralType() || 871 RHSExp->getType()->isRecordType() || 872 RHSExp->getType()->isRecordType()) { 873 // Add the appropriate overloaded operators (C++ [over.match.oper]) 874 // to the candidate set. 875 OverloadCandidateSet CandidateSet; 876 Expr *Args[2] = { LHSExp, RHSExp }; 877 AddOperatorCandidates(OO_Subscript, S, Args, 2, CandidateSet); 878 879 // Perform overload resolution. 880 OverloadCandidateSet::iterator Best; 881 switch (BestViableFunction(CandidateSet, Best)) { 882 case OR_Success: { 883 // We found a built-in operator or an overloaded operator. 884 FunctionDecl *FnDecl = Best->Function; 885 886 if (FnDecl) { 887 // We matched an overloaded operator. Build a call to that 888 // operator. 889 890 // Convert the arguments. 891 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 892 if (PerformObjectArgumentInitialization(LHSExp, Method) || 893 PerformCopyInitialization(RHSExp, 894 FnDecl->getParamDecl(0)->getType(), 895 "passing")) 896 return true; 897 } else { 898 // Convert the arguments. 899 if (PerformCopyInitialization(LHSExp, 900 FnDecl->getParamDecl(0)->getType(), 901 "passing") || 902 PerformCopyInitialization(RHSExp, 903 FnDecl->getParamDecl(1)->getType(), 904 "passing")) 905 return true; 906 } 907 908 // Determine the result type 909 QualType ResultTy 910 = FnDecl->getType()->getAsFunctionType()->getResultType(); 911 ResultTy = ResultTy.getNonReferenceType(); 912 913 // Build the actual expression node. 914 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 915 SourceLocation()); 916 UsualUnaryConversions(FnExpr); 917 918 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, LLoc); 919 } else { 920 // We matched a built-in operator. Convert the arguments, then 921 // break out so that we will build the appropriate built-in 922 // operator node. 923 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 924 "passing") || 925 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 926 "passing")) 927 return true; 928 929 break; 930 } 931 } 932 933 case OR_No_Viable_Function: 934 // No viable function; fall through to handling this as a 935 // built-in operator, which will produce an error message for us. 936 break; 937 938 case OR_Ambiguous: 939 Diag(LLoc, diag::err_ovl_ambiguous_oper) 940 << "[]" 941 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 942 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 943 return true; 944 } 945 946 // Either we found no viable overloaded operator or we matched a 947 // built-in operator. In either case, fall through to trying to 948 // build a built-in operation. 949 } 950 951 // Perform default conversions. 952 DefaultFunctionArrayConversion(LHSExp); 953 DefaultFunctionArrayConversion(RHSExp); 954 955 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 956 957 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 958 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 959 // in the subscript position. As a result, we need to derive the array base 960 // and index from the expression types. 961 Expr *BaseExpr, *IndexExpr; 962 QualType ResultType; 963 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 964 BaseExpr = LHSExp; 965 IndexExpr = RHSExp; 966 // FIXME: need to deal with const... 967 ResultType = PTy->getPointeeType(); 968 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 969 // Handle the uncommon case of "123[Ptr]". 970 BaseExpr = RHSExp; 971 IndexExpr = LHSExp; 972 // FIXME: need to deal with const... 973 ResultType = PTy->getPointeeType(); 974 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 975 BaseExpr = LHSExp; // vectors: V[123] 976 IndexExpr = RHSExp; 977 978 // Component access limited to variables (reject vec4.rg[1]). 979 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 980 !isa<ExtVectorElementExpr>(BaseExpr)) 981 return Diag(LLoc, diag::err_ext_vector_component_access) 982 << SourceRange(LLoc, RLoc); 983 // FIXME: need to deal with const... 984 ResultType = VTy->getElementType(); 985 } else { 986 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value) 987 << RHSExp->getSourceRange(); 988 } 989 // C99 6.5.2.1p1 990 if (!IndexExpr->getType()->isIntegerType()) 991 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript) 992 << IndexExpr->getSourceRange(); 993 994 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 995 // the following check catches trying to index a pointer to a function (e.g. 996 // void (*)(int)) and pointers to incomplete types. Functions are not 997 // objects in C99. 998 if (!ResultType->isObjectType()) 999 return Diag(BaseExpr->getLocStart(), 1000 diag::err_typecheck_subscript_not_object) 1001 << BaseExpr->getType().getAsString() << BaseExpr->getSourceRange(); 1002 1003 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 1004} 1005 1006QualType Sema:: 1007CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1008 IdentifierInfo &CompName, SourceLocation CompLoc) { 1009 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1010 1011 // This flag determines whether or not the component is to be treated as a 1012 // special name, or a regular GLSL-style component access. 1013 bool SpecialComponent = false; 1014 1015 // The vector accessor can't exceed the number of elements. 1016 const char *compStr = CompName.getName(); 1017 if (strlen(compStr) > vecType->getNumElements()) { 1018 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1019 << baseType.getAsString() << SourceRange(CompLoc); 1020 return QualType(); 1021 } 1022 1023 // Check that we've found one of the special components, or that the component 1024 // names must come from the same set. 1025 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1026 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 1027 SpecialComponent = true; 1028 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1029 do 1030 compStr++; 1031 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1032 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 1033 do 1034 compStr++; 1035 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 1036 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 1037 do 1038 compStr++; 1039 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 1040 } 1041 1042 if (!SpecialComponent && *compStr) { 1043 // We didn't get to the end of the string. This means the component names 1044 // didn't come from the same set *or* we encountered an illegal name. 1045 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1046 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1047 return QualType(); 1048 } 1049 // Each component accessor can't exceed the vector type. 1050 compStr = CompName.getName(); 1051 while (*compStr) { 1052 if (vecType->isAccessorWithinNumElements(*compStr)) 1053 compStr++; 1054 else 1055 break; 1056 } 1057 if (!SpecialComponent && *compStr) { 1058 // We didn't get to the end of the string. This means a component accessor 1059 // exceeds the number of elements in the vector. 1060 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1061 << baseType.getAsString() << SourceRange(CompLoc); 1062 return QualType(); 1063 } 1064 1065 // If we have a special component name, verify that the current vector length 1066 // is an even number, since all special component names return exactly half 1067 // the elements. 1068 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 1069 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1070 << baseType.getAsString() << SourceRange(CompLoc); 1071 return QualType(); 1072 } 1073 1074 // The component accessor looks fine - now we need to compute the actual type. 1075 // The vector type is implied by the component accessor. For example, 1076 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1077 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1078 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 1079 : CompName.getLength(); 1080 if (CompSize == 1) 1081 return vecType->getElementType(); 1082 1083 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1084 // Now look up the TypeDefDecl from the vector type. Without this, 1085 // diagostics look bad. We want extended vector types to appear built-in. 1086 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1087 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1088 return Context.getTypedefType(ExtVectorDecls[i]); 1089 } 1090 return VT; // should never get here (a typedef type should always be found). 1091} 1092 1093/// constructSetterName - Return the setter name for the given 1094/// identifier, i.e. "set" + Name where the initial character of Name 1095/// has been capitalized. 1096// FIXME: Merge with same routine in Parser. But where should this 1097// live? 1098static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 1099 const IdentifierInfo *Name) { 1100 llvm::SmallString<100> SelectorName; 1101 SelectorName = "set"; 1102 SelectorName.append(Name->getName(), Name->getName()+Name->getLength()); 1103 SelectorName[3] = toupper(SelectorName[3]); 1104 return &Idents.get(&SelectorName[0], &SelectorName[SelectorName.size()]); 1105} 1106 1107Action::ExprResult Sema:: 1108ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 1109 tok::TokenKind OpKind, SourceLocation MemberLoc, 1110 IdentifierInfo &Member) { 1111 Expr *BaseExpr = static_cast<Expr *>(Base); 1112 assert(BaseExpr && "no record expression"); 1113 1114 // Perform default conversions. 1115 DefaultFunctionArrayConversion(BaseExpr); 1116 1117 QualType BaseType = BaseExpr->getType(); 1118 assert(!BaseType.isNull() && "no type for member expression"); 1119 1120 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1121 // must have pointer type, and the accessed type is the pointee. 1122 if (OpKind == tok::arrow) { 1123 if (const PointerType *PT = BaseType->getAsPointerType()) 1124 BaseType = PT->getPointeeType(); 1125 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1126 return BuildOverloadedArrowExpr(BaseExpr, OpLoc, MemberLoc, Member); 1127 else 1128 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow) 1129 << BaseType.getAsString() << BaseExpr->getSourceRange(); 1130 } 1131 1132 // Handle field access to simple records. This also handles access to fields 1133 // of the ObjC 'id' struct. 1134 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1135 RecordDecl *RDecl = RTy->getDecl(); 1136 if (RTy->isIncompleteType()) 1137 return Diag(OpLoc, diag::err_typecheck_incomplete_tag) 1138 << RDecl->getName() << BaseExpr->getSourceRange(); 1139 // The record definition is complete, now make sure the member is valid. 1140 FieldDecl *MemberDecl = RDecl->getMember(&Member); 1141 if (!MemberDecl) 1142 return Diag(MemberLoc, diag::err_typecheck_no_member) 1143 << &Member << BaseExpr->getSourceRange(); 1144 1145 // Figure out the type of the member; see C99 6.5.2.3p3 1146 // FIXME: Handle address space modifiers 1147 QualType MemberType = MemberDecl->getType(); 1148 unsigned combinedQualifiers = 1149 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1150 if (CXXFieldDecl *CXXMember = dyn_cast<CXXFieldDecl>(MemberDecl)) { 1151 if (CXXMember->isMutable()) 1152 combinedQualifiers &= ~QualType::Const; 1153 } 1154 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1155 1156 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 1157 MemberLoc, MemberType); 1158 } 1159 1160 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1161 // (*Obj).ivar. 1162 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1163 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) 1164 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 1165 OpKind == tok::arrow); 1166 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1167 << IFTy->getDecl()->getName() << &Member 1168 << BaseExpr->getSourceRange(); 1169 } 1170 1171 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1172 // pointer to a (potentially qualified) interface type. 1173 const PointerType *PTy; 1174 const ObjCInterfaceType *IFTy; 1175 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1176 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1177 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1178 1179 // Search for a declared property first. 1180 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 1181 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1182 1183 // Check protocols on qualified interfaces. 1184 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1185 E = IFTy->qual_end(); I != E; ++I) 1186 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1187 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1188 1189 // If that failed, look for an "implicit" property by seeing if the nullary 1190 // selector is implemented. 1191 1192 // FIXME: The logic for looking up nullary and unary selectors should be 1193 // shared with the code in ActOnInstanceMessage. 1194 1195 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1196 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1197 1198 // If this reference is in an @implementation, check for 'private' methods. 1199 if (!Getter) 1200 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1201 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1202 if (ObjCImplementationDecl *ImpDecl = 1203 ObjCImplementations[ClassDecl->getIdentifier()]) 1204 Getter = ImpDecl->getInstanceMethod(Sel); 1205 1206 // Look through local category implementations associated with the class. 1207 if (!Getter) { 1208 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1209 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1210 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1211 } 1212 } 1213 if (Getter) { 1214 // If we found a getter then this may be a valid dot-reference, we 1215 // need to also look for the matching setter. 1216 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 1217 &Member); 1218 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 1219 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1220 1221 if (!Setter) { 1222 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1223 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1224 if (ObjCImplementationDecl *ImpDecl = 1225 ObjCImplementations[ClassDecl->getIdentifier()]) 1226 Setter = ImpDecl->getInstanceMethod(SetterSel); 1227 } 1228 1229 // FIXME: There are some issues here. First, we are not 1230 // diagnosing accesses to read-only properties because we do not 1231 // know if this is a getter or setter yet. Second, we are 1232 // checking that the type of the setter matches the type we 1233 // expect. 1234 return new ObjCPropertyRefExpr(Getter, Setter, Getter->getResultType(), 1235 MemberLoc, BaseExpr); 1236 } 1237 } 1238 // Handle properties on qualified "id" protocols. 1239 const ObjCQualifiedIdType *QIdTy; 1240 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1241 // Check protocols on qualified interfaces. 1242 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1243 E = QIdTy->qual_end(); I != E; ++I) 1244 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1245 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1246 } 1247 // Handle 'field access' to vectors, such as 'V.xx'. 1248 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1249 // Component access limited to variables (reject vec4.rg.g). 1250 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1251 !isa<ExtVectorElementExpr>(BaseExpr)) 1252 return Diag(MemberLoc, diag::err_ext_vector_component_access) 1253 << BaseExpr->getSourceRange(); 1254 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1255 if (ret.isNull()) 1256 return true; 1257 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1258 } 1259 1260 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 1261 << BaseType.getAsString() << BaseExpr->getSourceRange(); 1262} 1263 1264/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1265/// This provides the location of the left/right parens and a list of comma 1266/// locations. 1267Action::ExprResult Sema:: 1268ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 1269 ExprTy **args, unsigned NumArgs, 1270 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1271 Expr *Fn = static_cast<Expr *>(fn); 1272 Expr **Args = reinterpret_cast<Expr**>(args); 1273 assert(Fn && "no function call expression"); 1274 FunctionDecl *FDecl = NULL; 1275 OverloadedFunctionDecl *Ovl = NULL; 1276 1277 // If we're directly calling a function or a set of overloaded 1278 // functions, get the appropriate declaration. 1279 { 1280 DeclRefExpr *DRExpr = NULL; 1281 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1282 DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()); 1283 else 1284 DRExpr = dyn_cast<DeclRefExpr>(Fn); 1285 1286 if (DRExpr) { 1287 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1288 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1289 } 1290 } 1291 1292 // If we have a set of overloaded functions, perform overload 1293 // resolution to pick the function. 1294 if (Ovl) { 1295 OverloadCandidateSet CandidateSet; 1296 AddOverloadCandidates(Ovl, Args, NumArgs, CandidateSet); 1297 OverloadCandidateSet::iterator Best; 1298 switch (BestViableFunction(CandidateSet, Best)) { 1299 case OR_Success: 1300 { 1301 // Success! Let the remainder of this function build a call to 1302 // the function selected by overload resolution. 1303 FDecl = Best->Function; 1304 Expr *NewFn = new DeclRefExpr(FDecl, FDecl->getType(), 1305 Fn->getSourceRange().getBegin()); 1306 delete Fn; 1307 Fn = NewFn; 1308 } 1309 break; 1310 1311 case OR_No_Viable_Function: 1312 if (CandidateSet.empty()) 1313 Diag(Fn->getSourceRange().getBegin(), 1314 diag::err_ovl_no_viable_function_in_call) 1315 << Ovl->getName() << Fn->getSourceRange(); 1316 else { 1317 Diag(Fn->getSourceRange().getBegin(), 1318 diag::err_ovl_no_viable_function_in_call_with_cands) 1319 << Ovl->getName() << Fn->getSourceRange(); 1320 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1321 } 1322 return true; 1323 1324 case OR_Ambiguous: 1325 Diag(Fn->getSourceRange().getBegin(), diag::err_ovl_ambiguous_call) 1326 << Ovl->getName() << Fn->getSourceRange(); 1327 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1328 return true; 1329 } 1330 } 1331 1332 if (getLangOptions().CPlusPlus && Fn->getType()->isRecordType()) 1333 return BuildCallToObjectOfClassType(Fn, LParenLoc, Args, NumArgs, 1334 CommaLocs, RParenLoc); 1335 1336 // Promote the function operand. 1337 UsualUnaryConversions(Fn); 1338 1339 // Make the call expr early, before semantic checks. This guarantees cleanup 1340 // of arguments and function on error. 1341 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1342 Context.BoolTy, RParenLoc)); 1343 const FunctionType *FuncT; 1344 if (!Fn->getType()->isBlockPointerType()) { 1345 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1346 // have type pointer to function". 1347 const PointerType *PT = Fn->getType()->getAsPointerType(); 1348 if (PT == 0) 1349 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1350 << Fn->getType().getAsString() << Fn->getSourceRange(); 1351 FuncT = PT->getPointeeType()->getAsFunctionType(); 1352 } else { // This is a block call. 1353 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1354 getAsFunctionType(); 1355 } 1356 if (FuncT == 0) 1357 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1358 << Fn->getType().getAsString() << Fn->getSourceRange(); 1359 1360 // We know the result type of the call, set it. 1361 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 1362 1363 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1364 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1365 // assignment, to the types of the corresponding parameter, ... 1366 unsigned NumArgsInProto = Proto->getNumArgs(); 1367 unsigned NumArgsToCheck = NumArgs; 1368 1369 // If too few arguments are available (and we don't have default 1370 // arguments for the remaining parameters), don't make the call. 1371 if (NumArgs < NumArgsInProto) { 1372 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 1373 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 1374 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 1375 // Use default arguments for missing arguments 1376 NumArgsToCheck = NumArgsInProto; 1377 TheCall->setNumArgs(NumArgsInProto); 1378 } 1379 1380 // If too many are passed and not variadic, error on the extras and drop 1381 // them. 1382 if (NumArgs > NumArgsInProto) { 1383 if (!Proto->isVariadic()) { 1384 Diag(Args[NumArgsInProto]->getLocStart(), 1385 diag::err_typecheck_call_too_many_args) 1386 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 1387 << SourceRange(Args[NumArgsInProto]->getLocStart(), 1388 Args[NumArgs-1]->getLocEnd()); 1389 // This deletes the extra arguments. 1390 TheCall->setNumArgs(NumArgsInProto); 1391 } 1392 NumArgsToCheck = NumArgsInProto; 1393 } 1394 1395 // Continue to check argument types (even if we have too few/many args). 1396 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1397 QualType ProtoArgType = Proto->getArgType(i); 1398 1399 Expr *Arg; 1400 if (i < NumArgs) 1401 Arg = Args[i]; 1402 else 1403 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1404 QualType ArgType = Arg->getType(); 1405 1406 // Pass the argument. 1407 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 1408 return true; 1409 1410 TheCall->setArg(i, Arg); 1411 } 1412 1413 // If this is a variadic call, handle args passed through "...". 1414 if (Proto->isVariadic()) { 1415 // Promote the arguments (C99 6.5.2.2p7). 1416 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1417 Expr *Arg = Args[i]; 1418 DefaultArgumentPromotion(Arg); 1419 TheCall->setArg(i, Arg); 1420 } 1421 } 1422 } else { 1423 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1424 1425 // Promote the arguments (C99 6.5.2.2p6). 1426 for (unsigned i = 0; i != NumArgs; i++) { 1427 Expr *Arg = Args[i]; 1428 DefaultArgumentPromotion(Arg); 1429 TheCall->setArg(i, Arg); 1430 } 1431 } 1432 1433 // Do special checking on direct calls to functions. 1434 if (FDecl) 1435 return CheckFunctionCall(FDecl, TheCall.take()); 1436 1437 return TheCall.take(); 1438} 1439 1440Action::ExprResult Sema:: 1441ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1442 SourceLocation RParenLoc, ExprTy *InitExpr) { 1443 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1444 QualType literalType = QualType::getFromOpaquePtr(Ty); 1445 // FIXME: put back this assert when initializers are worked out. 1446 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1447 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1448 1449 if (literalType->isArrayType()) { 1450 if (literalType->isVariableArrayType()) 1451 return Diag(LParenLoc, diag::err_variable_object_no_init) 1452 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1453 } else if (literalType->isIncompleteType()) { 1454 return Diag(LParenLoc, diag::err_typecheck_decl_incomplete_type) 1455 << literalType.getAsString() 1456 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1457 } 1458 1459 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 1460 "temporary")) 1461 return true; 1462 1463 bool isFileScope = !getCurFunctionDecl() && !getCurMethodDecl(); 1464 if (isFileScope) { // 6.5.2.5p3 1465 if (CheckForConstantInitializer(literalExpr, literalType)) 1466 return true; 1467 } 1468 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, 1469 isFileScope); 1470} 1471 1472Action::ExprResult Sema:: 1473ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1474 InitListDesignations &Designators, 1475 SourceLocation RBraceLoc) { 1476 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1477 1478 // Semantic analysis for initializers is done by ActOnDeclarator() and 1479 // CheckInitializer() - it requires knowledge of the object being intialized. 1480 1481 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc, 1482 Designators.hasAnyDesignators()); 1483 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1484 return E; 1485} 1486 1487/// CheckCastTypes - Check type constraints for casting between types. 1488bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1489 UsualUnaryConversions(castExpr); 1490 1491 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1492 // type needs to be scalar. 1493 if (castType->isVoidType()) { 1494 // Cast to void allows any expr type. 1495 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1496 // GCC struct/union extension: allow cast to self. 1497 if (Context.getCanonicalType(castType) != 1498 Context.getCanonicalType(castExpr->getType()) || 1499 (!castType->isStructureType() && !castType->isUnionType())) { 1500 // Reject any other conversions to non-scalar types. 1501 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 1502 << castType.getAsString() << castExpr->getSourceRange(); 1503 } 1504 1505 // accept this, but emit an ext-warn. 1506 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 1507 << castType.getAsString() << castExpr->getSourceRange(); 1508 } else if (!castExpr->getType()->isScalarType() && 1509 !castExpr->getType()->isVectorType()) { 1510 return Diag(castExpr->getLocStart(), 1511 diag::err_typecheck_expect_scalar_operand) 1512 << castExpr->getType().getAsString() << castExpr->getSourceRange(); 1513 } else if (castExpr->getType()->isVectorType()) { 1514 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1515 return true; 1516 } else if (castType->isVectorType()) { 1517 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1518 return true; 1519 } 1520 return false; 1521} 1522 1523bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1524 assert(VectorTy->isVectorType() && "Not a vector type!"); 1525 1526 if (Ty->isVectorType() || Ty->isIntegerType()) { 1527 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1528 return Diag(R.getBegin(), 1529 Ty->isVectorType() ? 1530 diag::err_invalid_conversion_between_vectors : 1531 diag::err_invalid_conversion_between_vector_and_integer) 1532 << VectorTy.getAsString() << Ty.getAsString() << R; 1533 } else 1534 return Diag(R.getBegin(), 1535 diag::err_invalid_conversion_between_vector_and_scalar) 1536 << VectorTy.getAsString() << Ty.getAsString() << R; 1537 1538 return false; 1539} 1540 1541Action::ExprResult Sema:: 1542ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1543 SourceLocation RParenLoc, ExprTy *Op) { 1544 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1545 1546 Expr *castExpr = static_cast<Expr*>(Op); 1547 QualType castType = QualType::getFromOpaquePtr(Ty); 1548 1549 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1550 return true; 1551 return new CStyleCastExpr(castType, castExpr, castType, LParenLoc, RParenLoc); 1552} 1553 1554/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1555/// In that case, lex = cond. 1556inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1557 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1558 UsualUnaryConversions(cond); 1559 UsualUnaryConversions(lex); 1560 UsualUnaryConversions(rex); 1561 QualType condT = cond->getType(); 1562 QualType lexT = lex->getType(); 1563 QualType rexT = rex->getType(); 1564 1565 // first, check the condition. 1566 if (!condT->isScalarType()) { // C99 6.5.15p2 1567 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 1568 << condT.getAsString(); 1569 return QualType(); 1570 } 1571 1572 // Now check the two expressions. 1573 1574 // If both operands have arithmetic type, do the usual arithmetic conversions 1575 // to find a common type: C99 6.5.15p3,5. 1576 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1577 UsualArithmeticConversions(lex, rex); 1578 return lex->getType(); 1579 } 1580 1581 // If both operands are the same structure or union type, the result is that 1582 // type. 1583 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1584 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1585 if (LHSRT->getDecl() == RHSRT->getDecl()) 1586 // "If both the operands have structure or union type, the result has 1587 // that type." This implies that CV qualifiers are dropped. 1588 return lexT.getUnqualifiedType(); 1589 } 1590 1591 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1592 // The following || allows only one side to be void (a GCC-ism). 1593 if (lexT->isVoidType() || rexT->isVoidType()) { 1594 if (!lexT->isVoidType()) 1595 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void) 1596 << rex->getSourceRange(); 1597 if (!rexT->isVoidType()) 1598 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void) 1599 << lex->getSourceRange(); 1600 ImpCastExprToType(lex, Context.VoidTy); 1601 ImpCastExprToType(rex, Context.VoidTy); 1602 return Context.VoidTy; 1603 } 1604 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1605 // the type of the other operand." 1606 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1607 Context.isObjCObjectPointerType(lexT)) && 1608 rex->isNullPointerConstant(Context)) { 1609 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1610 return lexT; 1611 } 1612 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1613 Context.isObjCObjectPointerType(rexT)) && 1614 lex->isNullPointerConstant(Context)) { 1615 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1616 return rexT; 1617 } 1618 // Handle the case where both operands are pointers before we handle null 1619 // pointer constants in case both operands are null pointer constants. 1620 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1621 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1622 // get the "pointed to" types 1623 QualType lhptee = LHSPT->getPointeeType(); 1624 QualType rhptee = RHSPT->getPointeeType(); 1625 1626 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1627 if (lhptee->isVoidType() && 1628 rhptee->isIncompleteOrObjectType()) { 1629 // Figure out necessary qualifiers (C99 6.5.15p6) 1630 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1631 QualType destType = Context.getPointerType(destPointee); 1632 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1633 ImpCastExprToType(rex, destType); // promote to void* 1634 return destType; 1635 } 1636 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1637 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1638 QualType destType = Context.getPointerType(destPointee); 1639 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1640 ImpCastExprToType(rex, destType); // promote to void* 1641 return destType; 1642 } 1643 1644 QualType compositeType = lexT; 1645 1646 // If either type is an Objective-C object type then check 1647 // compatibility according to Objective-C. 1648 if (Context.isObjCObjectPointerType(lexT) || 1649 Context.isObjCObjectPointerType(rexT)) { 1650 // If both operands are interfaces and either operand can be 1651 // assigned to the other, use that type as the composite 1652 // type. This allows 1653 // xxx ? (A*) a : (B*) b 1654 // where B is a subclass of A. 1655 // 1656 // Additionally, as for assignment, if either type is 'id' 1657 // allow silent coercion. Finally, if the types are 1658 // incompatible then make sure to use 'id' as the composite 1659 // type so the result is acceptable for sending messages to. 1660 1661 // FIXME: This code should not be localized to here. Also this 1662 // should use a compatible check instead of abusing the 1663 // canAssignObjCInterfaces code. 1664 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1665 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1666 if (LHSIface && RHSIface && 1667 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1668 compositeType = lexT; 1669 } else if (LHSIface && RHSIface && 1670 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1671 compositeType = rexT; 1672 } else if (Context.isObjCIdType(lhptee) || 1673 Context.isObjCIdType(rhptee)) { 1674 // FIXME: This code looks wrong, because isObjCIdType checks 1675 // the struct but getObjCIdType returns the pointer to 1676 // struct. This is horrible and should be fixed. 1677 compositeType = Context.getObjCIdType(); 1678 } else { 1679 QualType incompatTy = Context.getObjCIdType(); 1680 ImpCastExprToType(lex, incompatTy); 1681 ImpCastExprToType(rex, incompatTy); 1682 return incompatTy; 1683 } 1684 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1685 rhptee.getUnqualifiedType())) { 1686 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers) 1687 << lexT.getAsString() << rexT.getAsString() 1688 << lex->getSourceRange() << rex->getSourceRange(); 1689 // In this situation, we assume void* type. No especially good 1690 // reason, but this is what gcc does, and we do have to pick 1691 // to get a consistent AST. 1692 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1693 ImpCastExprToType(lex, incompatTy); 1694 ImpCastExprToType(rex, incompatTy); 1695 return incompatTy; 1696 } 1697 // The pointer types are compatible. 1698 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1699 // differently qualified versions of compatible types, the result type is 1700 // a pointer to an appropriately qualified version of the *composite* 1701 // type. 1702 // FIXME: Need to calculate the composite type. 1703 // FIXME: Need to add qualifiers 1704 ImpCastExprToType(lex, compositeType); 1705 ImpCastExprToType(rex, compositeType); 1706 return compositeType; 1707 } 1708 } 1709 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1710 // evaluates to "struct objc_object *" (and is handled above when comparing 1711 // id with statically typed objects). 1712 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1713 // GCC allows qualified id and any Objective-C type to devolve to 1714 // id. Currently localizing to here until clear this should be 1715 // part of ObjCQualifiedIdTypesAreCompatible. 1716 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1717 (lexT->isObjCQualifiedIdType() && 1718 Context.isObjCObjectPointerType(rexT)) || 1719 (rexT->isObjCQualifiedIdType() && 1720 Context.isObjCObjectPointerType(lexT))) { 1721 // FIXME: This is not the correct composite type. This only 1722 // happens to work because id can more or less be used anywhere, 1723 // however this may change the type of method sends. 1724 // FIXME: gcc adds some type-checking of the arguments and emits 1725 // (confusing) incompatible comparison warnings in some 1726 // cases. Investigate. 1727 QualType compositeType = Context.getObjCIdType(); 1728 ImpCastExprToType(lex, compositeType); 1729 ImpCastExprToType(rex, compositeType); 1730 return compositeType; 1731 } 1732 } 1733 1734 // Selection between block pointer types is ok as long as they are the same. 1735 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1736 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1737 return lexT; 1738 1739 // Otherwise, the operands are not compatible. 1740 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands) 1741 << lexT.getAsString() << rexT.getAsString() 1742 << lex->getSourceRange() << rex->getSourceRange(); 1743 return QualType(); 1744} 1745 1746/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1747/// in the case of a the GNU conditional expr extension. 1748Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1749 SourceLocation ColonLoc, 1750 ExprTy *Cond, ExprTy *LHS, 1751 ExprTy *RHS) { 1752 Expr *CondExpr = (Expr *) Cond; 1753 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1754 1755 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1756 // was the condition. 1757 bool isLHSNull = LHSExpr == 0; 1758 if (isLHSNull) 1759 LHSExpr = CondExpr; 1760 1761 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1762 RHSExpr, QuestionLoc); 1763 if (result.isNull()) 1764 return true; 1765 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1766 RHSExpr, result); 1767} 1768 1769 1770// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1771// being closely modeled after the C99 spec:-). The odd characteristic of this 1772// routine is it effectively iqnores the qualifiers on the top level pointee. 1773// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1774// FIXME: add a couple examples in this comment. 1775Sema::AssignConvertType 1776Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1777 QualType lhptee, rhptee; 1778 1779 // get the "pointed to" type (ignoring qualifiers at the top level) 1780 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1781 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1782 1783 // make sure we operate on the canonical type 1784 lhptee = Context.getCanonicalType(lhptee); 1785 rhptee = Context.getCanonicalType(rhptee); 1786 1787 AssignConvertType ConvTy = Compatible; 1788 1789 // C99 6.5.16.1p1: This following citation is common to constraints 1790 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1791 // qualifiers of the type *pointed to* by the right; 1792 // FIXME: Handle ASQualType 1793 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 1794 ConvTy = CompatiblePointerDiscardsQualifiers; 1795 1796 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1797 // incomplete type and the other is a pointer to a qualified or unqualified 1798 // version of void... 1799 if (lhptee->isVoidType()) { 1800 if (rhptee->isIncompleteOrObjectType()) 1801 return ConvTy; 1802 1803 // As an extension, we allow cast to/from void* to function pointer. 1804 assert(rhptee->isFunctionType()); 1805 return FunctionVoidPointer; 1806 } 1807 1808 if (rhptee->isVoidType()) { 1809 if (lhptee->isIncompleteOrObjectType()) 1810 return ConvTy; 1811 1812 // As an extension, we allow cast to/from void* to function pointer. 1813 assert(lhptee->isFunctionType()); 1814 return FunctionVoidPointer; 1815 } 1816 1817 // Check for ObjC interfaces 1818 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1819 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1820 if (LHSIface && RHSIface && 1821 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1822 return ConvTy; 1823 1824 // ID acts sort of like void* for ObjC interfaces 1825 if (LHSIface && Context.isObjCIdType(rhptee)) 1826 return ConvTy; 1827 if (RHSIface && Context.isObjCIdType(lhptee)) 1828 return ConvTy; 1829 1830 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1831 // unqualified versions of compatible types, ... 1832 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1833 rhptee.getUnqualifiedType())) 1834 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1835 return ConvTy; 1836} 1837 1838/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1839/// block pointer types are compatible or whether a block and normal pointer 1840/// are compatible. It is more restrict than comparing two function pointer 1841// types. 1842Sema::AssignConvertType 1843Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1844 QualType rhsType) { 1845 QualType lhptee, rhptee; 1846 1847 // get the "pointed to" type (ignoring qualifiers at the top level) 1848 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1849 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1850 1851 // make sure we operate on the canonical type 1852 lhptee = Context.getCanonicalType(lhptee); 1853 rhptee = Context.getCanonicalType(rhptee); 1854 1855 AssignConvertType ConvTy = Compatible; 1856 1857 // For blocks we enforce that qualifiers are identical. 1858 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1859 ConvTy = CompatiblePointerDiscardsQualifiers; 1860 1861 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1862 return IncompatibleBlockPointer; 1863 return ConvTy; 1864} 1865 1866/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1867/// has code to accommodate several GCC extensions when type checking 1868/// pointers. Here are some objectionable examples that GCC considers warnings: 1869/// 1870/// int a, *pint; 1871/// short *pshort; 1872/// struct foo *pfoo; 1873/// 1874/// pint = pshort; // warning: assignment from incompatible pointer type 1875/// a = pint; // warning: assignment makes integer from pointer without a cast 1876/// pint = a; // warning: assignment makes pointer from integer without a cast 1877/// pint = pfoo; // warning: assignment from incompatible pointer type 1878/// 1879/// As a result, the code for dealing with pointers is more complex than the 1880/// C99 spec dictates. 1881/// 1882Sema::AssignConvertType 1883Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1884 // Get canonical types. We're not formatting these types, just comparing 1885 // them. 1886 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1887 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1888 1889 if (lhsType == rhsType) 1890 return Compatible; // Common case: fast path an exact match. 1891 1892 // If the left-hand side is a reference type, then we are in a 1893 // (rare!) case where we've allowed the use of references in C, 1894 // e.g., as a parameter type in a built-in function. In this case, 1895 // just make sure that the type referenced is compatible with the 1896 // right-hand side type. The caller is responsible for adjusting 1897 // lhsType so that the resulting expression does not have reference 1898 // type. 1899 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 1900 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 1901 return Compatible; 1902 return Incompatible; 1903 } 1904 1905 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1906 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1907 return Compatible; 1908 // Relax integer conversions like we do for pointers below. 1909 if (rhsType->isIntegerType()) 1910 return IntToPointer; 1911 if (lhsType->isIntegerType()) 1912 return PointerToInt; 1913 return IncompatibleObjCQualifiedId; 1914 } 1915 1916 if (lhsType->isVectorType() || rhsType->isVectorType()) { 1917 // For ExtVector, allow vector splats; float -> <n x float> 1918 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 1919 if (LV->getElementType() == rhsType) 1920 return Compatible; 1921 1922 // If we are allowing lax vector conversions, and LHS and RHS are both 1923 // vectors, the total size only needs to be the same. This is a bitcast; 1924 // no bits are changed but the result type is different. 1925 if (getLangOptions().LaxVectorConversions && 1926 lhsType->isVectorType() && rhsType->isVectorType()) { 1927 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1928 return Compatible; 1929 } 1930 return Incompatible; 1931 } 1932 1933 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1934 return Compatible; 1935 1936 if (isa<PointerType>(lhsType)) { 1937 if (rhsType->isIntegerType()) 1938 return IntToPointer; 1939 1940 if (isa<PointerType>(rhsType)) 1941 return CheckPointerTypesForAssignment(lhsType, rhsType); 1942 1943 if (rhsType->getAsBlockPointerType()) { 1944 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1945 return BlockVoidPointer; 1946 1947 // Treat block pointers as objects. 1948 if (getLangOptions().ObjC1 && 1949 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 1950 return Compatible; 1951 } 1952 return Incompatible; 1953 } 1954 1955 if (isa<BlockPointerType>(lhsType)) { 1956 if (rhsType->isIntegerType()) 1957 return IntToPointer; 1958 1959 // Treat block pointers as objects. 1960 if (getLangOptions().ObjC1 && 1961 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 1962 return Compatible; 1963 1964 if (rhsType->isBlockPointerType()) 1965 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 1966 1967 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 1968 if (RHSPT->getPointeeType()->isVoidType()) 1969 return BlockVoidPointer; 1970 } 1971 return Incompatible; 1972 } 1973 1974 if (isa<PointerType>(rhsType)) { 1975 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1976 if (lhsType == Context.BoolTy) 1977 return Compatible; 1978 1979 if (lhsType->isIntegerType()) 1980 return PointerToInt; 1981 1982 if (isa<PointerType>(lhsType)) 1983 return CheckPointerTypesForAssignment(lhsType, rhsType); 1984 1985 if (isa<BlockPointerType>(lhsType) && 1986 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1987 return BlockVoidPointer; 1988 return Incompatible; 1989 } 1990 1991 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1992 if (Context.typesAreCompatible(lhsType, rhsType)) 1993 return Compatible; 1994 } 1995 return Incompatible; 1996} 1997 1998Sema::AssignConvertType 1999Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2000 if (getLangOptions().CPlusPlus) { 2001 if (!lhsType->isRecordType()) { 2002 // C++ 5.17p3: If the left operand is not of class type, the 2003 // expression is implicitly converted (C++ 4) to the 2004 // cv-unqualified type of the left operand. 2005 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType())) 2006 return Incompatible; 2007 else 2008 return Compatible; 2009 } 2010 2011 // FIXME: Currently, we fall through and treat C++ classes like C 2012 // structures. 2013 } 2014 2015 // C99 6.5.16.1p1: the left operand is a pointer and the right is 2016 // a null pointer constant. 2017 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 2018 lhsType->isBlockPointerType()) 2019 && rExpr->isNullPointerConstant(Context)) { 2020 ImpCastExprToType(rExpr, lhsType); 2021 return Compatible; 2022 } 2023 2024 // We don't allow conversion of non-null-pointer constants to integers. 2025 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 2026 return IntToBlockPointer; 2027 2028 // This check seems unnatural, however it is necessary to ensure the proper 2029 // conversion of functions/arrays. If the conversion were done for all 2030 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 2031 // expressions that surpress this implicit conversion (&, sizeof). 2032 // 2033 // Suppress this for references: C++ 8.5.3p5. 2034 if (!lhsType->isReferenceType()) 2035 DefaultFunctionArrayConversion(rExpr); 2036 2037 Sema::AssignConvertType result = 2038 CheckAssignmentConstraints(lhsType, rExpr->getType()); 2039 2040 // C99 6.5.16.1p2: The value of the right operand is converted to the 2041 // type of the assignment expression. 2042 // CheckAssignmentConstraints allows the left-hand side to be a reference, 2043 // so that we can use references in built-in functions even in C. 2044 // The getNonReferenceType() call makes sure that the resulting expression 2045 // does not have reference type. 2046 if (rExpr->getType() != lhsType) 2047 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 2048 return result; 2049} 2050 2051Sema::AssignConvertType 2052Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 2053 return CheckAssignmentConstraints(lhsType, rhsType); 2054} 2055 2056QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 2057 Diag(Loc, diag::err_typecheck_invalid_operands) 2058 << lex->getType().getAsString() << rex->getType().getAsString() 2059 << lex->getSourceRange() << rex->getSourceRange(); 2060 return QualType(); 2061} 2062 2063inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 2064 Expr *&rex) { 2065 // For conversion purposes, we ignore any qualifiers. 2066 // For example, "const float" and "float" are equivalent. 2067 QualType lhsType = 2068 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 2069 QualType rhsType = 2070 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 2071 2072 // If the vector types are identical, return. 2073 if (lhsType == rhsType) 2074 return lhsType; 2075 2076 // Handle the case of a vector & extvector type of the same size and element 2077 // type. It would be nice if we only had one vector type someday. 2078 if (getLangOptions().LaxVectorConversions) 2079 if (const VectorType *LV = lhsType->getAsVectorType()) 2080 if (const VectorType *RV = rhsType->getAsVectorType()) 2081 if (LV->getElementType() == RV->getElementType() && 2082 LV->getNumElements() == RV->getNumElements()) 2083 return lhsType->isExtVectorType() ? lhsType : rhsType; 2084 2085 // If the lhs is an extended vector and the rhs is a scalar of the same type 2086 // or a literal, promote the rhs to the vector type. 2087 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 2088 QualType eltType = V->getElementType(); 2089 2090 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 2091 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 2092 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 2093 ImpCastExprToType(rex, lhsType); 2094 return lhsType; 2095 } 2096 } 2097 2098 // If the rhs is an extended vector and the lhs is a scalar of the same type, 2099 // promote the lhs to the vector type. 2100 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 2101 QualType eltType = V->getElementType(); 2102 2103 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 2104 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 2105 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 2106 ImpCastExprToType(lex, rhsType); 2107 return rhsType; 2108 } 2109 } 2110 2111 // You cannot convert between vector values of different size. 2112 Diag(Loc, diag::err_typecheck_vector_not_convertable) 2113 << lex->getType().getAsString() << rex->getType().getAsString() 2114 << lex->getSourceRange() << rex->getSourceRange(); 2115 return QualType(); 2116} 2117 2118inline QualType Sema::CheckMultiplyDivideOperands( 2119 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2120{ 2121 QualType lhsType = lex->getType(), rhsType = rex->getType(); 2122 2123 if (lhsType->isVectorType() || rhsType->isVectorType()) 2124 return CheckVectorOperands(Loc, lex, rex); 2125 2126 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2127 2128 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2129 return compType; 2130 return InvalidOperands(Loc, lex, rex); 2131} 2132 2133inline QualType Sema::CheckRemainderOperands( 2134 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2135{ 2136 QualType lhsType = lex->getType(), rhsType = rex->getType(); 2137 2138 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2139 2140 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2141 return compType; 2142 return InvalidOperands(Loc, lex, rex); 2143} 2144 2145inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 2146 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2147{ 2148 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2149 return CheckVectorOperands(Loc, lex, rex); 2150 2151 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2152 2153 // handle the common case first (both operands are arithmetic). 2154 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2155 return compType; 2156 2157 // Put any potential pointer into PExp 2158 Expr* PExp = lex, *IExp = rex; 2159 if (IExp->getType()->isPointerType()) 2160 std::swap(PExp, IExp); 2161 2162 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 2163 if (IExp->getType()->isIntegerType()) { 2164 // Check for arithmetic on pointers to incomplete types 2165 if (!PTy->getPointeeType()->isObjectType()) { 2166 if (PTy->getPointeeType()->isVoidType()) { 2167 Diag(Loc, diag::ext_gnu_void_ptr) 2168 << lex->getSourceRange() << rex->getSourceRange(); 2169 } else { 2170 Diag(Loc, diag::err_typecheck_arithmetic_incomplete_type) 2171 << lex->getType().getAsString() << lex->getSourceRange(); 2172 return QualType(); 2173 } 2174 } 2175 return PExp->getType(); 2176 } 2177 } 2178 2179 return InvalidOperands(Loc, lex, rex); 2180} 2181 2182// C99 6.5.6 2183QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 2184 SourceLocation Loc, bool isCompAssign) { 2185 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2186 return CheckVectorOperands(Loc, lex, rex); 2187 2188 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2189 2190 // Enforce type constraints: C99 6.5.6p3. 2191 2192 // Handle the common case first (both operands are arithmetic). 2193 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2194 return compType; 2195 2196 // Either ptr - int or ptr - ptr. 2197 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 2198 QualType lpointee = LHSPTy->getPointeeType(); 2199 2200 // The LHS must be an object type, not incomplete, function, etc. 2201 if (!lpointee->isObjectType()) { 2202 // Handle the GNU void* extension. 2203 if (lpointee->isVoidType()) { 2204 Diag(Loc, diag::ext_gnu_void_ptr) 2205 << lex->getSourceRange() << rex->getSourceRange(); 2206 } else { 2207 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2208 << lex->getType().getAsString() << lex->getSourceRange(); 2209 return QualType(); 2210 } 2211 } 2212 2213 // The result type of a pointer-int computation is the pointer type. 2214 if (rex->getType()->isIntegerType()) 2215 return lex->getType(); 2216 2217 // Handle pointer-pointer subtractions. 2218 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 2219 QualType rpointee = RHSPTy->getPointeeType(); 2220 2221 // RHS must be an object type, unless void (GNU). 2222 if (!rpointee->isObjectType()) { 2223 // Handle the GNU void* extension. 2224 if (rpointee->isVoidType()) { 2225 if (!lpointee->isVoidType()) 2226 Diag(Loc, diag::ext_gnu_void_ptr) 2227 << lex->getSourceRange() << rex->getSourceRange(); 2228 } else { 2229 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2230 << rex->getType().getAsString() << rex->getSourceRange(); 2231 return QualType(); 2232 } 2233 } 2234 2235 // Pointee types must be compatible. 2236 if (!Context.typesAreCompatible( 2237 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2238 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2239 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 2240 << lex->getType().getAsString() << rex->getType().getAsString() 2241 << lex->getSourceRange() << rex->getSourceRange(); 2242 return QualType(); 2243 } 2244 2245 return Context.getPointerDiffType(); 2246 } 2247 } 2248 2249 return InvalidOperands(Loc, lex, rex); 2250} 2251 2252// C99 6.5.7 2253QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2254 bool isCompAssign) { 2255 // C99 6.5.7p2: Each of the operands shall have integer type. 2256 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2257 return InvalidOperands(Loc, lex, rex); 2258 2259 // Shifts don't perform usual arithmetic conversions, they just do integer 2260 // promotions on each operand. C99 6.5.7p3 2261 if (!isCompAssign) 2262 UsualUnaryConversions(lex); 2263 UsualUnaryConversions(rex); 2264 2265 // "The type of the result is that of the promoted left operand." 2266 return lex->getType(); 2267} 2268 2269static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 2270 ASTContext& Context) { 2271 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2272 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2273 // ID acts sort of like void* for ObjC interfaces 2274 if (LHSIface && Context.isObjCIdType(RHS)) 2275 return true; 2276 if (RHSIface && Context.isObjCIdType(LHS)) 2277 return true; 2278 if (!LHSIface || !RHSIface) 2279 return false; 2280 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 2281 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 2282} 2283 2284// C99 6.5.8 2285QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2286 bool isRelational) { 2287 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2288 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 2289 2290 // C99 6.5.8p3 / C99 6.5.9p4 2291 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2292 UsualArithmeticConversions(lex, rex); 2293 else { 2294 UsualUnaryConversions(lex); 2295 UsualUnaryConversions(rex); 2296 } 2297 QualType lType = lex->getType(); 2298 QualType rType = rex->getType(); 2299 2300 // For non-floating point types, check for self-comparisons of the form 2301 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2302 // often indicate logic errors in the program. 2303 if (!lType->isFloatingType()) { 2304 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2305 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2306 if (DRL->getDecl() == DRR->getDecl()) 2307 Diag(Loc, diag::warn_selfcomparison); 2308 } 2309 2310 // The result of comparisons is 'bool' in C++, 'int' in C. 2311 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy : Context.IntTy; 2312 2313 if (isRelational) { 2314 if (lType->isRealType() && rType->isRealType()) 2315 return ResultTy; 2316 } else { 2317 // Check for comparisons of floating point operands using != and ==. 2318 if (lType->isFloatingType()) { 2319 assert (rType->isFloatingType()); 2320 CheckFloatComparison(Loc,lex,rex); 2321 } 2322 2323 if (lType->isArithmeticType() && rType->isArithmeticType()) 2324 return ResultTy; 2325 } 2326 2327 bool LHSIsNull = lex->isNullPointerConstant(Context); 2328 bool RHSIsNull = rex->isNullPointerConstant(Context); 2329 2330 // All of the following pointer related warnings are GCC extensions, except 2331 // when handling null pointer constants. One day, we can consider making them 2332 // errors (when -pedantic-errors is enabled). 2333 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2334 QualType LCanPointeeTy = 2335 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2336 QualType RCanPointeeTy = 2337 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2338 2339 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2340 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2341 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2342 RCanPointeeTy.getUnqualifiedType()) && 2343 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2344 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2345 << lType.getAsString() << rType.getAsString() 2346 << lex->getSourceRange() << rex->getSourceRange(); 2347 } 2348 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2349 return ResultTy; 2350 } 2351 // Handle block pointer types. 2352 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2353 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2354 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2355 2356 if (!LHSIsNull && !RHSIsNull && 2357 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2358 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2359 << lType.getAsString() << rType.getAsString() 2360 << lex->getSourceRange() << rex->getSourceRange(); 2361 } 2362 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2363 return ResultTy; 2364 } 2365 // Allow block pointers to be compared with null pointer constants. 2366 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2367 (lType->isPointerType() && rType->isBlockPointerType())) { 2368 if (!LHSIsNull && !RHSIsNull) { 2369 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2370 << lType.getAsString() << rType.getAsString() 2371 << lex->getSourceRange() << rex->getSourceRange(); 2372 } 2373 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2374 return ResultTy; 2375 } 2376 2377 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2378 if (lType->isPointerType() || rType->isPointerType()) { 2379 const PointerType *LPT = lType->getAsPointerType(); 2380 const PointerType *RPT = rType->getAsPointerType(); 2381 bool LPtrToVoid = LPT ? 2382 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 2383 bool RPtrToVoid = RPT ? 2384 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 2385 2386 if (!LPtrToVoid && !RPtrToVoid && 2387 !Context.typesAreCompatible(lType, rType)) { 2388 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2389 << lType.getAsString() << rType.getAsString() 2390 << lex->getSourceRange() << rex->getSourceRange(); 2391 ImpCastExprToType(rex, lType); 2392 return ResultTy; 2393 } 2394 ImpCastExprToType(rex, lType); 2395 return ResultTy; 2396 } 2397 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2398 ImpCastExprToType(rex, lType); 2399 return ResultTy; 2400 } else { 2401 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2402 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 2403 << lType.getAsString() << rType.getAsString() 2404 << lex->getSourceRange() << rex->getSourceRange(); 2405 ImpCastExprToType(rex, lType); 2406 return ResultTy; 2407 } 2408 } 2409 } 2410 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2411 rType->isIntegerType()) { 2412 if (!RHSIsNull) 2413 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2414 << lType.getAsString() << rType.getAsString() 2415 << lex->getSourceRange() << rex->getSourceRange(); 2416 ImpCastExprToType(rex, lType); // promote the integer to pointer 2417 return ResultTy; 2418 } 2419 if (lType->isIntegerType() && 2420 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2421 if (!LHSIsNull) 2422 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2423 << lType.getAsString() << rType.getAsString() 2424 << lex->getSourceRange() << rex->getSourceRange(); 2425 ImpCastExprToType(lex, rType); // promote the integer to pointer 2426 return ResultTy; 2427 } 2428 // Handle block pointers. 2429 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2430 if (!RHSIsNull) 2431 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2432 << lType.getAsString() << rType.getAsString() 2433 << lex->getSourceRange() << rex->getSourceRange(); 2434 ImpCastExprToType(rex, lType); // promote the integer to pointer 2435 return ResultTy; 2436 } 2437 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2438 if (!LHSIsNull) 2439 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2440 << lType.getAsString() << rType.getAsString() 2441 << lex->getSourceRange() << rex->getSourceRange(); 2442 ImpCastExprToType(lex, rType); // promote the integer to pointer 2443 return ResultTy; 2444 } 2445 return InvalidOperands(Loc, lex, rex); 2446} 2447 2448/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2449/// operates on extended vector types. Instead of producing an IntTy result, 2450/// like a scalar comparison, a vector comparison produces a vector of integer 2451/// types. 2452QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2453 SourceLocation Loc, 2454 bool isRelational) { 2455 // Check to make sure we're operating on vectors of the same type and width, 2456 // Allowing one side to be a scalar of element type. 2457 QualType vType = CheckVectorOperands(Loc, lex, rex); 2458 if (vType.isNull()) 2459 return vType; 2460 2461 QualType lType = lex->getType(); 2462 QualType rType = rex->getType(); 2463 2464 // For non-floating point types, check for self-comparisons of the form 2465 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2466 // often indicate logic errors in the program. 2467 if (!lType->isFloatingType()) { 2468 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2469 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2470 if (DRL->getDecl() == DRR->getDecl()) 2471 Diag(Loc, diag::warn_selfcomparison); 2472 } 2473 2474 // Check for comparisons of floating point operands using != and ==. 2475 if (!isRelational && lType->isFloatingType()) { 2476 assert (rType->isFloatingType()); 2477 CheckFloatComparison(Loc,lex,rex); 2478 } 2479 2480 // Return the type for the comparison, which is the same as vector type for 2481 // integer vectors, or an integer type of identical size and number of 2482 // elements for floating point vectors. 2483 if (lType->isIntegerType()) 2484 return lType; 2485 2486 const VectorType *VTy = lType->getAsVectorType(); 2487 2488 // FIXME: need to deal with non-32b int / non-64b long long 2489 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2490 if (TypeSize == 32) { 2491 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2492 } 2493 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2494 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2495} 2496 2497inline QualType Sema::CheckBitwiseOperands( 2498 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2499{ 2500 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2501 return CheckVectorOperands(Loc, lex, rex); 2502 2503 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2504 2505 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2506 return compType; 2507 return InvalidOperands(Loc, lex, rex); 2508} 2509 2510inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2511 Expr *&lex, Expr *&rex, SourceLocation Loc) 2512{ 2513 UsualUnaryConversions(lex); 2514 UsualUnaryConversions(rex); 2515 2516 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2517 return Context.IntTy; 2518 return InvalidOperands(Loc, lex, rex); 2519} 2520 2521/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 2522/// emit an error and return true. If so, return false. 2523static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 2524 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 2525 if (IsLV == Expr::MLV_Valid) 2526 return false; 2527 2528 unsigned Diag = 0; 2529 bool NeedType = false; 2530 switch (IsLV) { // C99 6.5.16p2 2531 default: assert(0 && "Unknown result from isModifiableLvalue!"); 2532 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 2533 case Expr::MLV_ArrayType: 2534 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 2535 NeedType = true; 2536 break; 2537 case Expr::MLV_NotObjectType: 2538 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 2539 NeedType = true; 2540 break; 2541 case Expr::MLV_LValueCast: 2542 Diag = diag::err_typecheck_lvalue_casts_not_supported; 2543 break; 2544 case Expr::MLV_InvalidExpression: 2545 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 2546 break; 2547 case Expr::MLV_IncompleteType: 2548 case Expr::MLV_IncompleteVoidType: 2549 Diag = diag::err_typecheck_incomplete_type_not_modifiable_lvalue; 2550 NeedType = true; 2551 break; 2552 case Expr::MLV_DuplicateVectorComponents: 2553 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 2554 break; 2555 case Expr::MLV_NotBlockQualified: 2556 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 2557 break; 2558 } 2559 2560 if (NeedType) 2561 S.Diag(Loc, Diag) << E->getType().getAsString() << E->getSourceRange(); 2562 else 2563 S.Diag(Loc, Diag) << E->getSourceRange(); 2564 return true; 2565} 2566 2567 2568 2569// C99 6.5.16.1 2570QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 2571 SourceLocation Loc, 2572 QualType CompoundType) { 2573 // Verify that LHS is a modifiable lvalue, and emit error if not. 2574 if (CheckForModifiableLvalue(LHS, Loc, *this)) 2575 return QualType(); 2576 2577 QualType LHSType = LHS->getType(); 2578 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 2579 2580 AssignConvertType ConvTy; 2581 if (CompoundType.isNull()) { 2582 // Simple assignment "x = y". 2583 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 2584 2585 // If the RHS is a unary plus or minus, check to see if they = and + are 2586 // right next to each other. If so, the user may have typo'd "x =+ 4" 2587 // instead of "x += 4". 2588 Expr *RHSCheck = RHS; 2589 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2590 RHSCheck = ICE->getSubExpr(); 2591 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2592 if ((UO->getOpcode() == UnaryOperator::Plus || 2593 UO->getOpcode() == UnaryOperator::Minus) && 2594 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 2595 // Only if the two operators are exactly adjacent. 2596 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2597 Diag(Loc, diag::warn_not_compound_assign) 2598 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 2599 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 2600 } 2601 } else { 2602 // Compound assignment "x += y" 2603 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 2604 } 2605 2606 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 2607 RHS, "assigning")) 2608 return QualType(); 2609 2610 // C99 6.5.16p3: The type of an assignment expression is the type of the 2611 // left operand unless the left operand has qualified type, in which case 2612 // it is the unqualified version of the type of the left operand. 2613 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2614 // is converted to the type of the assignment expression (above). 2615 // C++ 5.17p1: the type of the assignment expression is that of its left 2616 // oprdu. 2617 return LHSType.getUnqualifiedType(); 2618} 2619 2620// C99 6.5.17 2621QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 2622 // FIXME: what is required for LHS? 2623 2624 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2625 DefaultFunctionArrayConversion(RHS); 2626 return RHS->getType(); 2627} 2628 2629/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2630/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2631QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc) { 2632 QualType ResType = Op->getType(); 2633 assert(!ResType.isNull() && "no type for increment/decrement expression"); 2634 2635 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2636 if (ResType->isRealType()) { 2637 // OK! 2638 } else if (const PointerType *PT = ResType->getAsPointerType()) { 2639 // C99 6.5.2.4p2, 6.5.6p2 2640 if (PT->getPointeeType()->isObjectType()) { 2641 // Pointer to object is ok! 2642 } else if (PT->getPointeeType()->isVoidType()) { 2643 // Pointer to void is extension. 2644 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 2645 } else { 2646 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type) 2647 << ResType.getAsString() << Op->getSourceRange(); 2648 return QualType(); 2649 } 2650 } else if (ResType->isComplexType()) { 2651 // C99 does not support ++/-- on complex types, we allow as an extension. 2652 Diag(OpLoc, diag::ext_integer_increment_complex) 2653 << ResType.getAsString() << Op->getSourceRange(); 2654 } else { 2655 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 2656 << ResType.getAsString() << Op->getSourceRange(); 2657 return QualType(); 2658 } 2659 // At this point, we know we have a real, complex or pointer type. 2660 // Now make sure the operand is a modifiable lvalue. 2661 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 2662 return QualType(); 2663 return ResType; 2664} 2665 2666/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2667/// This routine allows us to typecheck complex/recursive expressions 2668/// where the declaration is needed for type checking. We only need to 2669/// handle cases when the expression references a function designator 2670/// or is an lvalue. Here are some examples: 2671/// - &(x) => x 2672/// - &*****f => f for f a function designator. 2673/// - &s.xx => s 2674/// - &s.zz[1].yy -> s, if zz is an array 2675/// - *(x + 1) -> x, if x is an array 2676/// - &"123"[2] -> 0 2677/// - & __real__ x -> x 2678static NamedDecl *getPrimaryDecl(Expr *E) { 2679 switch (E->getStmtClass()) { 2680 case Stmt::DeclRefExprClass: 2681 return cast<DeclRefExpr>(E)->getDecl(); 2682 case Stmt::MemberExprClass: 2683 // Fields cannot be declared with a 'register' storage class. 2684 // &X->f is always ok, even if X is declared register. 2685 if (cast<MemberExpr>(E)->isArrow()) 2686 return 0; 2687 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2688 case Stmt::ArraySubscriptExprClass: { 2689 // &X[4] and &4[X] refers to X if X is not a pointer. 2690 2691 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2692 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 2693 if (!VD || VD->getType()->isPointerType()) 2694 return 0; 2695 else 2696 return VD; 2697 } 2698 case Stmt::UnaryOperatorClass: { 2699 UnaryOperator *UO = cast<UnaryOperator>(E); 2700 2701 switch(UO->getOpcode()) { 2702 case UnaryOperator::Deref: { 2703 // *(X + 1) refers to X if X is not a pointer. 2704 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 2705 ValueDecl *VD = dyn_cast<ValueDecl>(D); 2706 if (!VD || VD->getType()->isPointerType()) 2707 return 0; 2708 return VD; 2709 } 2710 return 0; 2711 } 2712 case UnaryOperator::Real: 2713 case UnaryOperator::Imag: 2714 case UnaryOperator::Extension: 2715 return getPrimaryDecl(UO->getSubExpr()); 2716 default: 2717 return 0; 2718 } 2719 } 2720 case Stmt::BinaryOperatorClass: { 2721 BinaryOperator *BO = cast<BinaryOperator>(E); 2722 2723 // Handle cases involving pointer arithmetic. The result of an 2724 // Assign or AddAssign is not an lvalue so they can be ignored. 2725 2726 // (x + n) or (n + x) => x 2727 if (BO->getOpcode() == BinaryOperator::Add) { 2728 if (BO->getLHS()->getType()->isPointerType()) { 2729 return getPrimaryDecl(BO->getLHS()); 2730 } else if (BO->getRHS()->getType()->isPointerType()) { 2731 return getPrimaryDecl(BO->getRHS()); 2732 } 2733 } 2734 2735 return 0; 2736 } 2737 case Stmt::ParenExprClass: 2738 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2739 case Stmt::ImplicitCastExprClass: 2740 // &X[4] when X is an array, has an implicit cast from array to pointer. 2741 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2742 default: 2743 return 0; 2744 } 2745} 2746 2747/// CheckAddressOfOperand - The operand of & must be either a function 2748/// designator or an lvalue designating an object. If it is an lvalue, the 2749/// object cannot be declared with storage class register or be a bit field. 2750/// Note: The usual conversions are *not* applied to the operand of the & 2751/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2752/// In C++, the operand might be an overloaded function name, in which case 2753/// we allow the '&' but retain the overloaded-function type. 2754QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2755 if (getLangOptions().C99) { 2756 // Implement C99-only parts of addressof rules. 2757 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2758 if (uOp->getOpcode() == UnaryOperator::Deref) 2759 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2760 // (assuming the deref expression is valid). 2761 return uOp->getSubExpr()->getType(); 2762 } 2763 // Technically, there should be a check for array subscript 2764 // expressions here, but the result of one is always an lvalue anyway. 2765 } 2766 NamedDecl *dcl = getPrimaryDecl(op); 2767 Expr::isLvalueResult lval = op->isLvalue(Context); 2768 2769 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2770 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2771 // FIXME: emit more specific diag... 2772 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 2773 << op->getSourceRange(); 2774 return QualType(); 2775 } 2776 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2777 if (MemExpr->getMemberDecl()->isBitField()) { 2778 Diag(OpLoc, diag::err_typecheck_address_of) 2779 << "bit-field" << op->getSourceRange(); 2780 return QualType(); 2781 } 2782 // Check for Apple extension for accessing vector components. 2783 } else if (isa<ArraySubscriptExpr>(op) && 2784 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2785 Diag(OpLoc, diag::err_typecheck_address_of) 2786 << "vector" << op->getSourceRange(); 2787 return QualType(); 2788 } else if (dcl) { // C99 6.5.3.2p1 2789 // We have an lvalue with a decl. Make sure the decl is not declared 2790 // with the register storage-class specifier. 2791 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2792 if (vd->getStorageClass() == VarDecl::Register) { 2793 Diag(OpLoc, diag::err_typecheck_address_of) 2794 << "register variable" << op->getSourceRange(); 2795 return QualType(); 2796 } 2797 } else if (isa<OverloadedFunctionDecl>(dcl)) 2798 return Context.OverloadTy; 2799 else 2800 assert(0 && "Unknown/unexpected decl type"); 2801 } 2802 2803 // If the operand has type "type", the result has type "pointer to type". 2804 return Context.getPointerType(op->getType()); 2805} 2806 2807QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 2808 UsualUnaryConversions(op); 2809 QualType qType = op->getType(); 2810 2811 if (const PointerType *PT = qType->getAsPointerType()) { 2812 // Note that per both C89 and C99, this is always legal, even 2813 // if ptype is an incomplete type or void. 2814 // It would be possible to warn about dereferencing a 2815 // void pointer, but it's completely well-defined, 2816 // and such a warning is unlikely to catch any mistakes. 2817 return PT->getPointeeType(); 2818 } 2819 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 2820 << qType.getAsString() << op->getSourceRange(); 2821 return QualType(); 2822} 2823 2824static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2825 tok::TokenKind Kind) { 2826 BinaryOperator::Opcode Opc; 2827 switch (Kind) { 2828 default: assert(0 && "Unknown binop!"); 2829 case tok::star: Opc = BinaryOperator::Mul; break; 2830 case tok::slash: Opc = BinaryOperator::Div; break; 2831 case tok::percent: Opc = BinaryOperator::Rem; break; 2832 case tok::plus: Opc = BinaryOperator::Add; break; 2833 case tok::minus: Opc = BinaryOperator::Sub; break; 2834 case tok::lessless: Opc = BinaryOperator::Shl; break; 2835 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2836 case tok::lessequal: Opc = BinaryOperator::LE; break; 2837 case tok::less: Opc = BinaryOperator::LT; break; 2838 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2839 case tok::greater: Opc = BinaryOperator::GT; break; 2840 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2841 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2842 case tok::amp: Opc = BinaryOperator::And; break; 2843 case tok::caret: Opc = BinaryOperator::Xor; break; 2844 case tok::pipe: Opc = BinaryOperator::Or; break; 2845 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2846 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2847 case tok::equal: Opc = BinaryOperator::Assign; break; 2848 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2849 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2850 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2851 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2852 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2853 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2854 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2855 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2856 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2857 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2858 case tok::comma: Opc = BinaryOperator::Comma; break; 2859 } 2860 return Opc; 2861} 2862 2863static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2864 tok::TokenKind Kind) { 2865 UnaryOperator::Opcode Opc; 2866 switch (Kind) { 2867 default: assert(0 && "Unknown unary op!"); 2868 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2869 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2870 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2871 case tok::star: Opc = UnaryOperator::Deref; break; 2872 case tok::plus: Opc = UnaryOperator::Plus; break; 2873 case tok::minus: Opc = UnaryOperator::Minus; break; 2874 case tok::tilde: Opc = UnaryOperator::Not; break; 2875 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2876 case tok::kw___real: Opc = UnaryOperator::Real; break; 2877 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2878 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2879 } 2880 return Opc; 2881} 2882 2883/// CreateBuiltinBinOp - Creates a new built-in binary operation with 2884/// operator @p Opc at location @c TokLoc. This routine only supports 2885/// built-in operations; ActOnBinOp handles overloaded operators. 2886Action::ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 2887 unsigned Op, 2888 Expr *lhs, Expr *rhs) { 2889 QualType ResultTy; // Result type of the binary operator. 2890 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2891 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 2892 2893 switch (Opc) { 2894 default: 2895 assert(0 && "Unknown binary expr!"); 2896 case BinaryOperator::Assign: 2897 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 2898 break; 2899 case BinaryOperator::Mul: 2900 case BinaryOperator::Div: 2901 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 2902 break; 2903 case BinaryOperator::Rem: 2904 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 2905 break; 2906 case BinaryOperator::Add: 2907 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 2908 break; 2909 case BinaryOperator::Sub: 2910 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 2911 break; 2912 case BinaryOperator::Shl: 2913 case BinaryOperator::Shr: 2914 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 2915 break; 2916 case BinaryOperator::LE: 2917 case BinaryOperator::LT: 2918 case BinaryOperator::GE: 2919 case BinaryOperator::GT: 2920 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 2921 break; 2922 case BinaryOperator::EQ: 2923 case BinaryOperator::NE: 2924 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 2925 break; 2926 case BinaryOperator::And: 2927 case BinaryOperator::Xor: 2928 case BinaryOperator::Or: 2929 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 2930 break; 2931 case BinaryOperator::LAnd: 2932 case BinaryOperator::LOr: 2933 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 2934 break; 2935 case BinaryOperator::MulAssign: 2936 case BinaryOperator::DivAssign: 2937 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 2938 if (!CompTy.isNull()) 2939 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2940 break; 2941 case BinaryOperator::RemAssign: 2942 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 2943 if (!CompTy.isNull()) 2944 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2945 break; 2946 case BinaryOperator::AddAssign: 2947 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 2948 if (!CompTy.isNull()) 2949 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2950 break; 2951 case BinaryOperator::SubAssign: 2952 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 2953 if (!CompTy.isNull()) 2954 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2955 break; 2956 case BinaryOperator::ShlAssign: 2957 case BinaryOperator::ShrAssign: 2958 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 2959 if (!CompTy.isNull()) 2960 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2961 break; 2962 case BinaryOperator::AndAssign: 2963 case BinaryOperator::XorAssign: 2964 case BinaryOperator::OrAssign: 2965 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 2966 if (!CompTy.isNull()) 2967 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2968 break; 2969 case BinaryOperator::Comma: 2970 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 2971 break; 2972 } 2973 if (ResultTy.isNull()) 2974 return true; 2975 if (CompTy.isNull()) 2976 return new BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc); 2977 else 2978 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, OpLoc); 2979} 2980 2981// Binary Operators. 'Tok' is the token for the operator. 2982Action::ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 2983 tok::TokenKind Kind, 2984 ExprTy *LHS, ExprTy *RHS) { 2985 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 2986 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 2987 2988 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 2989 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 2990 2991 if (getLangOptions().CPlusPlus && 2992 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 2993 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 2994 // If this is one of the assignment operators, we only perform 2995 // overload resolution if the left-hand side is a class or 2996 // enumeration type (C++ [expr.ass]p3). 2997 if (Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign && 2998 !(lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType())) { 2999 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3000 } 3001 3002 // Determine which overloaded operator we're dealing with. 3003 static const OverloadedOperatorKind OverOps[] = { 3004 OO_Star, OO_Slash, OO_Percent, 3005 OO_Plus, OO_Minus, 3006 OO_LessLess, OO_GreaterGreater, 3007 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 3008 OO_EqualEqual, OO_ExclaimEqual, 3009 OO_Amp, 3010 OO_Caret, 3011 OO_Pipe, 3012 OO_AmpAmp, 3013 OO_PipePipe, 3014 OO_Equal, OO_StarEqual, 3015 OO_SlashEqual, OO_PercentEqual, 3016 OO_PlusEqual, OO_MinusEqual, 3017 OO_LessLessEqual, OO_GreaterGreaterEqual, 3018 OO_AmpEqual, OO_CaretEqual, 3019 OO_PipeEqual, 3020 OO_Comma 3021 }; 3022 OverloadedOperatorKind OverOp = OverOps[Opc]; 3023 3024 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3025 // to the candidate set. 3026 OverloadCandidateSet CandidateSet; 3027 Expr *Args[2] = { lhs, rhs }; 3028 AddOperatorCandidates(OverOp, S, Args, 2, CandidateSet); 3029 3030 // Perform overload resolution. 3031 OverloadCandidateSet::iterator Best; 3032 switch (BestViableFunction(CandidateSet, Best)) { 3033 case OR_Success: { 3034 // We found a built-in operator or an overloaded operator. 3035 FunctionDecl *FnDecl = Best->Function; 3036 3037 if (FnDecl) { 3038 // We matched an overloaded operator. Build a call to that 3039 // operator. 3040 3041 // Convert the arguments. 3042 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3043 if (PerformObjectArgumentInitialization(lhs, Method) || 3044 PerformCopyInitialization(rhs, FnDecl->getParamDecl(0)->getType(), 3045 "passing")) 3046 return true; 3047 } else { 3048 // Convert the arguments. 3049 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 3050 "passing") || 3051 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 3052 "passing")) 3053 return true; 3054 } 3055 3056 // Determine the result type 3057 QualType ResultTy 3058 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3059 ResultTy = ResultTy.getNonReferenceType(); 3060 3061 // Build the actual expression node. 3062 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 3063 SourceLocation()); 3064 UsualUnaryConversions(FnExpr); 3065 3066 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, TokLoc); 3067 } else { 3068 // We matched a built-in operator. Convert the arguments, then 3069 // break out so that we will build the appropriate built-in 3070 // operator node. 3071 if (PerformCopyInitialization(lhs, Best->BuiltinTypes.ParamTypes[0], 3072 "passing") || 3073 PerformCopyInitialization(rhs, Best->BuiltinTypes.ParamTypes[1], 3074 "passing")) 3075 return true; 3076 3077 break; 3078 } 3079 } 3080 3081 case OR_No_Viable_Function: 3082 // No viable function; fall through to handling this as a 3083 // built-in operator, which will produce an error message for us. 3084 break; 3085 3086 case OR_Ambiguous: 3087 Diag(TokLoc, diag::err_ovl_ambiguous_oper) 3088 << BinaryOperator::getOpcodeStr(Opc) 3089 << lhs->getSourceRange() << rhs->getSourceRange(); 3090 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3091 return true; 3092 } 3093 3094 // Either we found no viable overloaded operator or we matched a 3095 // built-in operator. In either case, fall through to trying to 3096 // build a built-in operation. 3097 } 3098 3099 // Build a built-in binary operation. 3100 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3101} 3102 3103// Unary Operators. 'Tok' is the token for the operator. 3104Action::ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 3105 tok::TokenKind Op, ExprTy *input) { 3106 Expr *Input = (Expr*)input; 3107 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 3108 3109 if (getLangOptions().CPlusPlus && 3110 (Input->getType()->isRecordType() 3111 || Input->getType()->isEnumeralType())) { 3112 // Determine which overloaded operator we're dealing with. 3113 static const OverloadedOperatorKind OverOps[] = { 3114 OO_None, OO_None, 3115 OO_PlusPlus, OO_MinusMinus, 3116 OO_Amp, OO_Star, 3117 OO_Plus, OO_Minus, 3118 OO_Tilde, OO_Exclaim, 3119 OO_None, OO_None, 3120 OO_None, 3121 OO_None 3122 }; 3123 OverloadedOperatorKind OverOp = OverOps[Opc]; 3124 3125 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3126 // to the candidate set. 3127 OverloadCandidateSet CandidateSet; 3128 if (OverOp != OO_None) 3129 AddOperatorCandidates(OverOp, S, &Input, 1, CandidateSet); 3130 3131 // Perform overload resolution. 3132 OverloadCandidateSet::iterator Best; 3133 switch (BestViableFunction(CandidateSet, Best)) { 3134 case OR_Success: { 3135 // We found a built-in operator or an overloaded operator. 3136 FunctionDecl *FnDecl = Best->Function; 3137 3138 if (FnDecl) { 3139 // We matched an overloaded operator. Build a call to that 3140 // operator. 3141 3142 // Convert the arguments. 3143 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3144 if (PerformObjectArgumentInitialization(Input, Method)) 3145 return true; 3146 } else { 3147 // Convert the arguments. 3148 if (PerformCopyInitialization(Input, 3149 FnDecl->getParamDecl(0)->getType(), 3150 "passing")) 3151 return true; 3152 } 3153 3154 // Determine the result type 3155 QualType ResultTy 3156 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3157 ResultTy = ResultTy.getNonReferenceType(); 3158 3159 // Build the actual expression node. 3160 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 3161 SourceLocation()); 3162 UsualUnaryConversions(FnExpr); 3163 3164 return new CXXOperatorCallExpr(FnExpr, &Input, 1, ResultTy, OpLoc); 3165 } else { 3166 // We matched a built-in operator. Convert the arguments, then 3167 // break out so that we will build the appropriate built-in 3168 // operator node. 3169 if (PerformCopyInitialization(Input, Best->BuiltinTypes.ParamTypes[0], 3170 "passing")) 3171 return true; 3172 3173 break; 3174 } 3175 } 3176 3177 case OR_No_Viable_Function: 3178 // No viable function; fall through to handling this as a 3179 // built-in operator, which will produce an error message for us. 3180 break; 3181 3182 case OR_Ambiguous: 3183 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 3184 << UnaryOperator::getOpcodeStr(Opc) 3185 << Input->getSourceRange(); 3186 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3187 return true; 3188 } 3189 3190 // Either we found no viable overloaded operator or we matched a 3191 // built-in operator. In either case, fall through to trying to 3192 // build a built-in operation. 3193 } 3194 3195 3196 QualType resultType; 3197 switch (Opc) { 3198 default: 3199 assert(0 && "Unimplemented unary expr!"); 3200 case UnaryOperator::PreInc: 3201 case UnaryOperator::PreDec: 3202 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 3203 break; 3204 case UnaryOperator::AddrOf: 3205 resultType = CheckAddressOfOperand(Input, OpLoc); 3206 break; 3207 case UnaryOperator::Deref: 3208 DefaultFunctionArrayConversion(Input); 3209 resultType = CheckIndirectionOperand(Input, OpLoc); 3210 break; 3211 case UnaryOperator::Plus: 3212 case UnaryOperator::Minus: 3213 UsualUnaryConversions(Input); 3214 resultType = Input->getType(); 3215 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 3216 break; 3217 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 3218 resultType->isEnumeralType()) 3219 break; 3220 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 3221 Opc == UnaryOperator::Plus && 3222 resultType->isPointerType()) 3223 break; 3224 3225 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3226 << resultType.getAsString(); 3227 case UnaryOperator::Not: // bitwise complement 3228 UsualUnaryConversions(Input); 3229 resultType = Input->getType(); 3230 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 3231 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 3232 // C99 does not support '~' for complex conjugation. 3233 Diag(OpLoc, diag::ext_integer_complement_complex) 3234 << resultType.getAsString() << Input->getSourceRange(); 3235 else if (!resultType->isIntegerType()) 3236 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3237 << resultType.getAsString() << Input->getSourceRange(); 3238 break; 3239 case UnaryOperator::LNot: // logical negation 3240 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 3241 DefaultFunctionArrayConversion(Input); 3242 resultType = Input->getType(); 3243 if (!resultType->isScalarType()) // C99 6.5.3.3p1 3244 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3245 << resultType.getAsString(); 3246 // LNot always has type int. C99 6.5.3.3p5. 3247 resultType = Context.IntTy; 3248 break; 3249 case UnaryOperator::Real: 3250 case UnaryOperator::Imag: 3251 resultType = CheckRealImagOperand(Input, OpLoc); 3252 break; 3253 case UnaryOperator::Extension: 3254 resultType = Input->getType(); 3255 break; 3256 } 3257 if (resultType.isNull()) 3258 return true; 3259 return new UnaryOperator(Input, Opc, resultType, OpLoc); 3260} 3261 3262/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 3263Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 3264 SourceLocation LabLoc, 3265 IdentifierInfo *LabelII) { 3266 // Look up the record for this label identifier. 3267 LabelStmt *&LabelDecl = LabelMap[LabelII]; 3268 3269 // If we haven't seen this label yet, create a forward reference. It 3270 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 3271 if (LabelDecl == 0) 3272 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 3273 3274 // Create the AST node. The address of a label always has type 'void*'. 3275 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 3276 Context.getPointerType(Context.VoidTy)); 3277} 3278 3279Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 3280 SourceLocation RPLoc) { // "({..})" 3281 Stmt *SubStmt = static_cast<Stmt*>(substmt); 3282 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 3283 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 3284 3285 // FIXME: there are a variety of strange constraints to enforce here, for 3286 // example, it is not possible to goto into a stmt expression apparently. 3287 // More semantic analysis is needed. 3288 3289 // FIXME: the last statement in the compount stmt has its value used. We 3290 // should not warn about it being unused. 3291 3292 // If there are sub stmts in the compound stmt, take the type of the last one 3293 // as the type of the stmtexpr. 3294 QualType Ty = Context.VoidTy; 3295 3296 if (!Compound->body_empty()) { 3297 Stmt *LastStmt = Compound->body_back(); 3298 // If LastStmt is a label, skip down through into the body. 3299 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 3300 LastStmt = Label->getSubStmt(); 3301 3302 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 3303 Ty = LastExpr->getType(); 3304 } 3305 3306 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 3307} 3308 3309Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 3310 SourceLocation TypeLoc, 3311 TypeTy *argty, 3312 OffsetOfComponent *CompPtr, 3313 unsigned NumComponents, 3314 SourceLocation RPLoc) { 3315 QualType ArgTy = QualType::getFromOpaquePtr(argty); 3316 assert(!ArgTy.isNull() && "Missing type argument!"); 3317 3318 // We must have at least one component that refers to the type, and the first 3319 // one is known to be a field designator. Verify that the ArgTy represents 3320 // a struct/union/class. 3321 if (!ArgTy->isRecordType()) 3322 return Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy.getAsString(); 3323 3324 // Otherwise, create a compound literal expression as the base, and 3325 // iteratively process the offsetof designators. 3326 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 3327 3328 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 3329 // GCC extension, diagnose them. 3330 if (NumComponents != 1) 3331 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 3332 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 3333 3334 for (unsigned i = 0; i != NumComponents; ++i) { 3335 const OffsetOfComponent &OC = CompPtr[i]; 3336 if (OC.isBrackets) { 3337 // Offset of an array sub-field. TODO: Should we allow vector elements? 3338 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 3339 if (!AT) { 3340 delete Res; 3341 return Diag(OC.LocEnd, diag::err_offsetof_array_type) 3342 << Res->getType().getAsString(); 3343 } 3344 3345 // FIXME: C++: Verify that operator[] isn't overloaded. 3346 3347 // C99 6.5.2.1p1 3348 Expr *Idx = static_cast<Expr*>(OC.U.E); 3349 if (!Idx->getType()->isIntegerType()) 3350 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript) 3351 << Idx->getSourceRange(); 3352 3353 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 3354 continue; 3355 } 3356 3357 const RecordType *RC = Res->getType()->getAsRecordType(); 3358 if (!RC) { 3359 delete Res; 3360 return Diag(OC.LocEnd, diag::err_offsetof_record_type) 3361 << Res->getType().getAsString(); 3362 } 3363 3364 // Get the decl corresponding to this. 3365 RecordDecl *RD = RC->getDecl(); 3366 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 3367 if (!MemberDecl) 3368 return Diag(BuiltinLoc, diag::err_typecheck_no_member) 3369 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd); 3370 3371 // FIXME: C++: Verify that MemberDecl isn't a static field. 3372 // FIXME: Verify that MemberDecl isn't a bitfield. 3373 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 3374 // matter here. 3375 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, 3376 MemberDecl->getType().getNonReferenceType()); 3377 } 3378 3379 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 3380 BuiltinLoc); 3381} 3382 3383 3384Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 3385 TypeTy *arg1, TypeTy *arg2, 3386 SourceLocation RPLoc) { 3387 QualType argT1 = QualType::getFromOpaquePtr(arg1); 3388 QualType argT2 = QualType::getFromOpaquePtr(arg2); 3389 3390 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 3391 3392 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 3393} 3394 3395Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 3396 ExprTy *expr1, ExprTy *expr2, 3397 SourceLocation RPLoc) { 3398 Expr *CondExpr = static_cast<Expr*>(cond); 3399 Expr *LHSExpr = static_cast<Expr*>(expr1); 3400 Expr *RHSExpr = static_cast<Expr*>(expr2); 3401 3402 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 3403 3404 // The conditional expression is required to be a constant expression. 3405 llvm::APSInt condEval(32); 3406 SourceLocation ExpLoc; 3407 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 3408 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant) 3409 << CondExpr->getSourceRange(); 3410 3411 // If the condition is > zero, then the AST type is the same as the LSHExpr. 3412 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 3413 RHSExpr->getType(); 3414 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 3415} 3416 3417//===----------------------------------------------------------------------===// 3418// Clang Extensions. 3419//===----------------------------------------------------------------------===// 3420 3421/// ActOnBlockStart - This callback is invoked when a block literal is started. 3422void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 3423 // Analyze block parameters. 3424 BlockSemaInfo *BSI = new BlockSemaInfo(); 3425 3426 // Add BSI to CurBlock. 3427 BSI->PrevBlockInfo = CurBlock; 3428 CurBlock = BSI; 3429 3430 BSI->ReturnType = 0; 3431 BSI->TheScope = BlockScope; 3432 3433 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 3434 PushDeclContext(BSI->TheDecl); 3435} 3436 3437void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 3438 // Analyze arguments to block. 3439 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 3440 "Not a function declarator!"); 3441 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 3442 3443 CurBlock->hasPrototype = FTI.hasPrototype; 3444 CurBlock->isVariadic = true; 3445 3446 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 3447 // no arguments, not a function that takes a single void argument. 3448 if (FTI.hasPrototype && 3449 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3450 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 3451 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 3452 // empty arg list, don't push any params. 3453 CurBlock->isVariadic = false; 3454 } else if (FTI.hasPrototype) { 3455 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 3456 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 3457 CurBlock->isVariadic = FTI.isVariadic; 3458 } 3459 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 3460 3461 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 3462 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 3463 // If this has an identifier, add it to the scope stack. 3464 if ((*AI)->getIdentifier()) 3465 PushOnScopeChains(*AI, CurBlock->TheScope); 3466} 3467 3468/// ActOnBlockError - If there is an error parsing a block, this callback 3469/// is invoked to pop the information about the block from the action impl. 3470void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 3471 // Ensure that CurBlock is deleted. 3472 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 3473 3474 // Pop off CurBlock, handle nested blocks. 3475 CurBlock = CurBlock->PrevBlockInfo; 3476 3477 // FIXME: Delete the ParmVarDecl objects as well??? 3478 3479} 3480 3481/// ActOnBlockStmtExpr - This is called when the body of a block statement 3482/// literal was successfully completed. ^(int x){...} 3483Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 3484 Scope *CurScope) { 3485 // Ensure that CurBlock is deleted. 3486 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 3487 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 3488 3489 PopDeclContext(); 3490 3491 // Pop off CurBlock, handle nested blocks. 3492 CurBlock = CurBlock->PrevBlockInfo; 3493 3494 QualType RetTy = Context.VoidTy; 3495 if (BSI->ReturnType) 3496 RetTy = QualType(BSI->ReturnType, 0); 3497 3498 llvm::SmallVector<QualType, 8> ArgTypes; 3499 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 3500 ArgTypes.push_back(BSI->Params[i]->getType()); 3501 3502 QualType BlockTy; 3503 if (!BSI->hasPrototype) 3504 BlockTy = Context.getFunctionTypeNoProto(RetTy); 3505 else 3506 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 3507 BSI->isVariadic, 0); 3508 3509 BlockTy = Context.getBlockPointerType(BlockTy); 3510 3511 BSI->TheDecl->setBody(Body.take()); 3512 return new BlockExpr(BSI->TheDecl, BlockTy); 3513} 3514 3515/// ExprsMatchFnType - return true if the Exprs in array Args have 3516/// QualTypes that match the QualTypes of the arguments of the FnType. 3517/// The number of arguments has already been validated to match the number of 3518/// arguments in FnType. 3519static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 3520 ASTContext &Context) { 3521 unsigned NumParams = FnType->getNumArgs(); 3522 for (unsigned i = 0; i != NumParams; ++i) { 3523 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 3524 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 3525 3526 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 3527 return false; 3528 } 3529 return true; 3530} 3531 3532Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 3533 SourceLocation *CommaLocs, 3534 SourceLocation BuiltinLoc, 3535 SourceLocation RParenLoc) { 3536 // __builtin_overload requires at least 2 arguments 3537 if (NumArgs < 2) 3538 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 3539 << SourceRange(BuiltinLoc, RParenLoc); 3540 3541 // The first argument is required to be a constant expression. It tells us 3542 // the number of arguments to pass to each of the functions to be overloaded. 3543 Expr **Args = reinterpret_cast<Expr**>(args); 3544 Expr *NParamsExpr = Args[0]; 3545 llvm::APSInt constEval(32); 3546 SourceLocation ExpLoc; 3547 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 3548 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 3549 << NParamsExpr->getSourceRange(); 3550 3551 // Verify that the number of parameters is > 0 3552 unsigned NumParams = constEval.getZExtValue(); 3553 if (NumParams == 0) 3554 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 3555 << NParamsExpr->getSourceRange(); 3556 // Verify that we have at least 1 + NumParams arguments to the builtin. 3557 if ((NumParams + 1) > NumArgs) 3558 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 3559 << SourceRange(BuiltinLoc, RParenLoc); 3560 3561 // Figure out the return type, by matching the args to one of the functions 3562 // listed after the parameters. 3563 OverloadExpr *OE = 0; 3564 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 3565 // UsualUnaryConversions will convert the function DeclRefExpr into a 3566 // pointer to function. 3567 Expr *Fn = UsualUnaryConversions(Args[i]); 3568 const FunctionTypeProto *FnType = 0; 3569 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3570 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3571 3572 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3573 // parameters, and the number of parameters must match the value passed to 3574 // the builtin. 3575 if (!FnType || (FnType->getNumArgs() != NumParams)) 3576 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype) 3577 << Fn->getSourceRange(); 3578 3579 // Scan the parameter list for the FunctionType, checking the QualType of 3580 // each parameter against the QualTypes of the arguments to the builtin. 3581 // If they match, return a new OverloadExpr. 3582 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3583 if (OE) 3584 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match) 3585 << OE->getFn()->getSourceRange(); 3586 // Remember our match, and continue processing the remaining arguments 3587 // to catch any errors. 3588 OE = new OverloadExpr(Args, NumArgs, i, 3589 FnType->getResultType().getNonReferenceType(), 3590 BuiltinLoc, RParenLoc); 3591 } 3592 } 3593 // Return the newly created OverloadExpr node, if we succeded in matching 3594 // exactly one of the candidate functions. 3595 if (OE) 3596 return OE; 3597 3598 // If we didn't find a matching function Expr in the __builtin_overload list 3599 // the return an error. 3600 std::string typeNames; 3601 for (unsigned i = 0; i != NumParams; ++i) { 3602 if (i != 0) typeNames += ", "; 3603 typeNames += Args[i+1]->getType().getAsString(); 3604 } 3605 3606 return Diag(BuiltinLoc, diag::err_overload_no_match) 3607 << typeNames << SourceRange(BuiltinLoc, RParenLoc); 3608} 3609 3610Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3611 ExprTy *expr, TypeTy *type, 3612 SourceLocation RPLoc) { 3613 Expr *E = static_cast<Expr*>(expr); 3614 QualType T = QualType::getFromOpaquePtr(type); 3615 3616 InitBuiltinVaListType(); 3617 3618 // Get the va_list type 3619 QualType VaListType = Context.getBuiltinVaListType(); 3620 // Deal with implicit array decay; for example, on x86-64, 3621 // va_list is an array, but it's supposed to decay to 3622 // a pointer for va_arg. 3623 if (VaListType->isArrayType()) 3624 VaListType = Context.getArrayDecayedType(VaListType); 3625 // Make sure the input expression also decays appropriately. 3626 UsualUnaryConversions(E); 3627 3628 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3629 return Diag(E->getLocStart(), 3630 diag::err_first_argument_to_va_arg_not_of_type_va_list) 3631 << E->getType().getAsString() << E->getSourceRange(); 3632 3633 // FIXME: Warn if a non-POD type is passed in. 3634 3635 return new VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 3636} 3637 3638bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3639 SourceLocation Loc, 3640 QualType DstType, QualType SrcType, 3641 Expr *SrcExpr, const char *Flavor) { 3642 // Decode the result (notice that AST's are still created for extensions). 3643 bool isInvalid = false; 3644 unsigned DiagKind; 3645 switch (ConvTy) { 3646 default: assert(0 && "Unknown conversion type"); 3647 case Compatible: return false; 3648 case PointerToInt: 3649 DiagKind = diag::ext_typecheck_convert_pointer_int; 3650 break; 3651 case IntToPointer: 3652 DiagKind = diag::ext_typecheck_convert_int_pointer; 3653 break; 3654 case IncompatiblePointer: 3655 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3656 break; 3657 case FunctionVoidPointer: 3658 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3659 break; 3660 case CompatiblePointerDiscardsQualifiers: 3661 // If the qualifiers lost were because we were applying the 3662 // (deprecated) C++ conversion from a string literal to a char* 3663 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3664 // Ideally, this check would be performed in 3665 // CheckPointerTypesForAssignment. However, that would require a 3666 // bit of refactoring (so that the second argument is an 3667 // expression, rather than a type), which should be done as part 3668 // of a larger effort to fix CheckPointerTypesForAssignment for 3669 // C++ semantics. 3670 if (getLangOptions().CPlusPlus && 3671 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3672 return false; 3673 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3674 break; 3675 case IntToBlockPointer: 3676 DiagKind = diag::err_int_to_block_pointer; 3677 break; 3678 case IncompatibleBlockPointer: 3679 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3680 break; 3681 case BlockVoidPointer: 3682 DiagKind = diag::ext_typecheck_convert_pointer_void_block; 3683 break; 3684 case IncompatibleObjCQualifiedId: 3685 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3686 // it can give a more specific diagnostic. 3687 DiagKind = diag::warn_incompatible_qualified_id; 3688 break; 3689 case Incompatible: 3690 DiagKind = diag::err_typecheck_convert_incompatible; 3691 isInvalid = true; 3692 break; 3693 } 3694 3695 Diag(Loc, DiagKind) << DstType.getAsString() << SrcType.getAsString() 3696 << Flavor << SrcExpr->getSourceRange(); 3697 return isInvalid; 3698} 3699