SemaExpr.cpp revision 5b82d61a725396ac1eae6aed4310ab275e609af3
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. 367/// 368/// If ForceResolution is true, then we will attempt to resolve the 369/// name even if it looks like a dependent name. This option is off by 370/// default. 371Sema::ExprResult Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 372 DeclarationName Name, 373 bool HasTrailingLParen, 374 const CXXScopeSpec *SS, 375 bool ForceResolution) { 376 if (S->getTemplateParamParent() && Name.getAsIdentifierInfo() && 377 HasTrailingLParen && !SS && !ForceResolution) { 378 // We've seen something of the form 379 // identifier( 380 // and we are in a template, so it is likely that 's' is a 381 // dependent name. However, we won't know until we've parsed all 382 // of the call arguments. So, build a CXXDependentNameExpr node 383 // to represent this name. Then, if it turns out that none of the 384 // arguments are type-dependent, we'll force the resolution of the 385 // dependent name at that point. 386 return new CXXDependentNameExpr(Name.getAsIdentifierInfo(), 387 Context.DependentTy, Loc); 388 } 389 390 // Could be enum-constant, value decl, instance variable, etc. 391 Decl *D; 392 if (SS && !SS->isEmpty()) { 393 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 394 if (DC == 0) 395 return true; 396 D = LookupDecl(Name, Decl::IDNS_Ordinary, S, DC); 397 } else 398 D = LookupDecl(Name, Decl::IDNS_Ordinary, S); 399 400 // If this reference is in an Objective-C method, then ivar lookup happens as 401 // well. 402 IdentifierInfo *II = Name.getAsIdentifierInfo(); 403 if (II && getCurMethodDecl()) { 404 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 405 // There are two cases to handle here. 1) scoped lookup could have failed, 406 // in which case we should look for an ivar. 2) scoped lookup could have 407 // found a decl, but that decl is outside the current method (i.e. a global 408 // variable). In these two cases, we do a lookup for an ivar with this 409 // name, if the lookup suceeds, we replace it our current decl. 410 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 411 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 412 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II)) { 413 // FIXME: This should use a new expr for a direct reference, don't turn 414 // this into Self->ivar, just return a BareIVarExpr or something. 415 IdentifierInfo &II = Context.Idents.get("self"); 416 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 417 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 418 static_cast<Expr*>(SelfExpr.Val), true, true); 419 } 420 } 421 // Needed to implement property "super.method" notation. 422 if (SD == 0 && II->isStr("super")) { 423 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 424 getCurMethodDecl()->getClassInterface())); 425 return new ObjCSuperExpr(Loc, T); 426 } 427 } 428 if (D == 0) { 429 // Otherwise, this could be an implicitly declared function reference (legal 430 // in C90, extension in C99). 431 if (HasTrailingLParen && II && 432 !getLangOptions().CPlusPlus) // Not in C++. 433 D = ImplicitlyDefineFunction(Loc, *II, S); 434 else { 435 // If this name wasn't predeclared and if this is not a function call, 436 // diagnose the problem. 437 if (SS && !SS->isEmpty()) 438 return Diag(Loc, diag::err_typecheck_no_member) 439 << Name << SS->getRange(); 440 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 441 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 442 return Diag(Loc, diag::err_undeclared_use) << Name.getAsString(); 443 else 444 return Diag(Loc, diag::err_undeclared_var_use) << Name; 445 } 446 } 447 448 if (CXXFieldDecl *FD = dyn_cast<CXXFieldDecl>(D)) { 449 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 450 if (MD->isStatic()) 451 // "invalid use of member 'x' in static member function" 452 return Diag(Loc, diag::err_invalid_member_use_in_static_method) 453 << FD->getDeclName(); 454 if (cast<CXXRecordDecl>(MD->getParent()) != FD->getParent()) 455 // "invalid use of nonstatic data member 'x'" 456 return Diag(Loc, diag::err_invalid_non_static_member_use) 457 << FD->getDeclName(); 458 459 if (FD->isInvalidDecl()) 460 return true; 461 462 // FIXME: Handle 'mutable'. 463 return new DeclRefExpr(FD, 464 FD->getType().getWithAdditionalQualifiers(MD->getTypeQualifiers()),Loc); 465 } 466 467 return Diag(Loc, diag::err_invalid_non_static_member_use) 468 << FD->getDeclName(); 469 } 470 if (isa<TypedefDecl>(D)) 471 return Diag(Loc, diag::err_unexpected_typedef) << Name; 472 if (isa<ObjCInterfaceDecl>(D)) 473 return Diag(Loc, diag::err_unexpected_interface) << Name; 474 if (isa<NamespaceDecl>(D)) 475 return Diag(Loc, diag::err_unexpected_namespace) << Name; 476 477 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 478 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 479 return new DeclRefExpr(Ovl, Context.OverloadTy, Loc); 480 481 ValueDecl *VD = cast<ValueDecl>(D); 482 483 // check if referencing an identifier with __attribute__((deprecated)). 484 if (VD->getAttr<DeprecatedAttr>()) 485 Diag(Loc, diag::warn_deprecated) << VD->getDeclName(); 486 487 // Only create DeclRefExpr's for valid Decl's. 488 if (VD->isInvalidDecl()) 489 return true; 490 491 // If the identifier reference is inside a block, and it refers to a value 492 // that is outside the block, create a BlockDeclRefExpr instead of a 493 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 494 // the block is formed. 495 // 496 // We do not do this for things like enum constants, global variables, etc, 497 // as they do not get snapshotted. 498 // 499 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 500 // The BlocksAttr indicates the variable is bound by-reference. 501 if (VD->getAttr<BlocksAttr>()) 502 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 503 Loc, true); 504 505 // Variable will be bound by-copy, make it const within the closure. 506 VD->getType().addConst(); 507 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 508 Loc, false); 509 } 510 // If this reference is not in a block or if the referenced variable is 511 // within the block, create a normal DeclRefExpr. 512 513 bool TypeDependent = false; 514 bool ValueDependent = false; 515 if (getLangOptions().CPlusPlus) { 516 // C++ [temp.dep.expr]p3: 517 // An id-expression is type-dependent if it contains: 518 // - an identifier that was declared with a dependent type, 519 if (VD->getType()->isDependentType()) 520 TypeDependent = true; 521 // - FIXME: a template-id that is dependent, 522 // - a conversion-function-id that specifies a dependent type, 523 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 524 Name.getCXXNameType()->isDependentType()) 525 TypeDependent = true; 526 // - a nested-name-specifier that contains a class-name that 527 // names a dependent type. 528 else if (SS && !SS->isEmpty()) { 529 for (DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 530 DC; DC = DC->getParent()) { 531 // FIXME: could stop early at namespace scope. 532 if (DC->isCXXRecord()) { 533 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 534 if (Context.getTypeDeclType(Record)->isDependentType()) { 535 TypeDependent = true; 536 break; 537 } 538 } 539 } 540 } 541 542 // C++ [temp.dep.constexpr]p2: 543 // 544 // An identifier is value-dependent if it is: 545 // - a name declared with a dependent type, 546 if (TypeDependent) 547 ValueDependent = true; 548 // - the name of a non-type template parameter, 549 else if (isa<NonTypeTemplateParmDecl>(VD)) 550 ValueDependent = true; 551 // - a constant with integral or enumeration type and is 552 // initialized with an expression that is value-dependent 553 // (FIXME!). 554 } 555 556 return new DeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 557 TypeDependent, ValueDependent); 558} 559 560Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 561 tok::TokenKind Kind) { 562 PredefinedExpr::IdentType IT; 563 564 switch (Kind) { 565 default: assert(0 && "Unknown simple primary expr!"); 566 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 567 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 568 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 569 } 570 571 // Verify that this is in a function context. 572 if (getCurFunctionOrMethodDecl() == 0) 573 return Diag(Loc, diag::err_predef_outside_function); 574 575 // Pre-defined identifiers are of type char[x], where x is the length of the 576 // string. 577 unsigned Length; 578 if (FunctionDecl *FD = getCurFunctionDecl()) 579 Length = FD->getIdentifier()->getLength(); 580 else 581 Length = getCurMethodDecl()->getSynthesizedMethodSize(); 582 583 llvm::APInt LengthI(32, Length + 1); 584 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 585 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 586 return new PredefinedExpr(Loc, ResTy, IT); 587} 588 589Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 590 llvm::SmallString<16> CharBuffer; 591 CharBuffer.resize(Tok.getLength()); 592 const char *ThisTokBegin = &CharBuffer[0]; 593 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 594 595 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 596 Tok.getLocation(), PP); 597 if (Literal.hadError()) 598 return ExprResult(true); 599 600 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 601 602 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 603 Tok.getLocation()); 604} 605 606Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 607 // fast path for a single digit (which is quite common). A single digit 608 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 609 if (Tok.getLength() == 1) { 610 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 611 612 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 613 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 614 Context.IntTy, 615 Tok.getLocation())); 616 } 617 llvm::SmallString<512> IntegerBuffer; 618 // Add padding so that NumericLiteralParser can overread by one character. 619 IntegerBuffer.resize(Tok.getLength()+1); 620 const char *ThisTokBegin = &IntegerBuffer[0]; 621 622 // Get the spelling of the token, which eliminates trigraphs, etc. 623 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 624 625 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 626 Tok.getLocation(), PP); 627 if (Literal.hadError) 628 return ExprResult(true); 629 630 Expr *Res; 631 632 if (Literal.isFloatingLiteral()) { 633 QualType Ty; 634 if (Literal.isFloat) 635 Ty = Context.FloatTy; 636 else if (!Literal.isLong) 637 Ty = Context.DoubleTy; 638 else 639 Ty = Context.LongDoubleTy; 640 641 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 642 643 // isExact will be set by GetFloatValue(). 644 bool isExact = false; 645 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 646 Ty, Tok.getLocation()); 647 648 } else if (!Literal.isIntegerLiteral()) { 649 return ExprResult(true); 650 } else { 651 QualType Ty; 652 653 // long long is a C99 feature. 654 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 655 Literal.isLongLong) 656 Diag(Tok.getLocation(), diag::ext_longlong); 657 658 // Get the value in the widest-possible width. 659 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 660 661 if (Literal.GetIntegerValue(ResultVal)) { 662 // If this value didn't fit into uintmax_t, warn and force to ull. 663 Diag(Tok.getLocation(), diag::warn_integer_too_large); 664 Ty = Context.UnsignedLongLongTy; 665 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 666 "long long is not intmax_t?"); 667 } else { 668 // If this value fits into a ULL, try to figure out what else it fits into 669 // according to the rules of C99 6.4.4.1p5. 670 671 // Octal, Hexadecimal, and integers with a U suffix are allowed to 672 // be an unsigned int. 673 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 674 675 // Check from smallest to largest, picking the smallest type we can. 676 unsigned Width = 0; 677 if (!Literal.isLong && !Literal.isLongLong) { 678 // Are int/unsigned possibilities? 679 unsigned IntSize = Context.Target.getIntWidth(); 680 681 // Does it fit in a unsigned int? 682 if (ResultVal.isIntN(IntSize)) { 683 // Does it fit in a signed int? 684 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 685 Ty = Context.IntTy; 686 else if (AllowUnsigned) 687 Ty = Context.UnsignedIntTy; 688 Width = IntSize; 689 } 690 } 691 692 // Are long/unsigned long possibilities? 693 if (Ty.isNull() && !Literal.isLongLong) { 694 unsigned LongSize = Context.Target.getLongWidth(); 695 696 // Does it fit in a unsigned long? 697 if (ResultVal.isIntN(LongSize)) { 698 // Does it fit in a signed long? 699 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 700 Ty = Context.LongTy; 701 else if (AllowUnsigned) 702 Ty = Context.UnsignedLongTy; 703 Width = LongSize; 704 } 705 } 706 707 // Finally, check long long if needed. 708 if (Ty.isNull()) { 709 unsigned LongLongSize = Context.Target.getLongLongWidth(); 710 711 // Does it fit in a unsigned long long? 712 if (ResultVal.isIntN(LongLongSize)) { 713 // Does it fit in a signed long long? 714 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 715 Ty = Context.LongLongTy; 716 else if (AllowUnsigned) 717 Ty = Context.UnsignedLongLongTy; 718 Width = LongLongSize; 719 } 720 } 721 722 // If we still couldn't decide a type, we probably have something that 723 // does not fit in a signed long long, but has no U suffix. 724 if (Ty.isNull()) { 725 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 726 Ty = Context.UnsignedLongLongTy; 727 Width = Context.Target.getLongLongWidth(); 728 } 729 730 if (ResultVal.getBitWidth() != Width) 731 ResultVal.trunc(Width); 732 } 733 734 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 735 } 736 737 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 738 if (Literal.isImaginary) 739 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 740 741 return Res; 742} 743 744Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 745 ExprTy *Val) { 746 Expr *E = (Expr *)Val; 747 assert((E != 0) && "ActOnParenExpr() missing expr"); 748 return new ParenExpr(L, R, E); 749} 750 751/// The UsualUnaryConversions() function is *not* called by this routine. 752/// See C99 6.3.2.1p[2-4] for more details. 753bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 754 SourceLocation OpLoc, 755 const SourceRange &ExprRange, 756 bool isSizeof) { 757 // C99 6.5.3.4p1: 758 if (isa<FunctionType>(exprType) && isSizeof) 759 // alignof(function) is allowed. 760 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 761 else if (exprType->isVoidType()) 762 Diag(OpLoc, diag::ext_sizeof_void_type) 763 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 764 else if (exprType->isIncompleteType()) 765 return Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 766 diag::err_alignof_incomplete_type) 767 << exprType << ExprRange; 768 769 return false; 770} 771 772/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 773/// the same for @c alignof and @c __alignof 774/// Note that the ArgRange is invalid if isType is false. 775Action::ExprResult 776Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 777 void *TyOrEx, const SourceRange &ArgRange) { 778 // If error parsing type, ignore. 779 if (TyOrEx == 0) return true; 780 781 QualType ArgTy; 782 SourceRange Range; 783 if (isType) { 784 ArgTy = QualType::getFromOpaquePtr(TyOrEx); 785 Range = ArgRange; 786 } else { 787 // Get the end location. 788 Expr *ArgEx = (Expr *)TyOrEx; 789 Range = ArgEx->getSourceRange(); 790 ArgTy = ArgEx->getType(); 791 } 792 793 // Verify that the operand is valid. 794 if (CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, isSizeof)) 795 return true; 796 797 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 798 return new SizeOfAlignOfExpr(isSizeof, isType, TyOrEx, Context.getSizeType(), 799 OpLoc, Range.getEnd()); 800} 801 802QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 803 DefaultFunctionArrayConversion(V); 804 805 // These operators return the element type of a complex type. 806 if (const ComplexType *CT = V->getType()->getAsComplexType()) 807 return CT->getElementType(); 808 809 // Otherwise they pass through real integer and floating point types here. 810 if (V->getType()->isArithmeticType()) 811 return V->getType(); 812 813 // Reject anything else. 814 Diag(Loc, diag::err_realimag_invalid_type) << V->getType(); 815 return QualType(); 816} 817 818 819 820Action::ExprResult Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 821 tok::TokenKind Kind, 822 ExprTy *Input) { 823 Expr *Arg = (Expr *)Input; 824 825 UnaryOperator::Opcode Opc; 826 switch (Kind) { 827 default: assert(0 && "Unknown unary op!"); 828 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 829 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 830 } 831 832 if (getLangOptions().CPlusPlus && 833 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 834 // Which overloaded operator? 835 OverloadedOperatorKind OverOp = 836 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 837 838 // C++ [over.inc]p1: 839 // 840 // [...] If the function is a member function with one 841 // parameter (which shall be of type int) or a non-member 842 // function with two parameters (the second of which shall be 843 // of type int), it defines the postfix increment operator ++ 844 // for objects of that type. When the postfix increment is 845 // called as a result of using the ++ operator, the int 846 // argument will have value zero. 847 Expr *Args[2] = { 848 Arg, 849 new IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 850 /*isSigned=*/true), 851 Context.IntTy, SourceLocation()) 852 }; 853 854 // Build the candidate set for overloading 855 OverloadCandidateSet CandidateSet; 856 AddOperatorCandidates(OverOp, S, Args, 2, CandidateSet); 857 858 // Perform overload resolution. 859 OverloadCandidateSet::iterator Best; 860 switch (BestViableFunction(CandidateSet, Best)) { 861 case OR_Success: { 862 // We found a built-in operator or an overloaded operator. 863 FunctionDecl *FnDecl = Best->Function; 864 865 if (FnDecl) { 866 // We matched an overloaded operator. Build a call to that 867 // operator. 868 869 // Convert the arguments. 870 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 871 if (PerformObjectArgumentInitialization(Arg, Method)) 872 return true; 873 } else { 874 // Convert the arguments. 875 if (PerformCopyInitialization(Arg, 876 FnDecl->getParamDecl(0)->getType(), 877 "passing")) 878 return true; 879 } 880 881 // Determine the result type 882 QualType ResultTy 883 = FnDecl->getType()->getAsFunctionType()->getResultType(); 884 ResultTy = ResultTy.getNonReferenceType(); 885 886 // Build the actual expression node. 887 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 888 SourceLocation()); 889 UsualUnaryConversions(FnExpr); 890 891 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, OpLoc); 892 } else { 893 // We matched a built-in operator. Convert the arguments, then 894 // break out so that we will build the appropriate built-in 895 // operator node. 896 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 897 "passing")) 898 return true; 899 900 break; 901 } 902 } 903 904 case OR_No_Viable_Function: 905 // No viable function; fall through to handling this as a 906 // built-in operator, which will produce an error message for us. 907 break; 908 909 case OR_Ambiguous: 910 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 911 << UnaryOperator::getOpcodeStr(Opc) 912 << Arg->getSourceRange(); 913 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 914 return true; 915 } 916 917 // Either we found no viable overloaded operator or we matched a 918 // built-in operator. In either case, fall through to trying to 919 // build a built-in operation. 920 } 921 922 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc); 923 if (result.isNull()) 924 return true; 925 return new UnaryOperator(Arg, Opc, result, OpLoc); 926} 927 928Action::ExprResult Sema:: 929ActOnArraySubscriptExpr(Scope *S, ExprTy *Base, SourceLocation LLoc, 930 ExprTy *Idx, SourceLocation RLoc) { 931 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 932 933 if (getLangOptions().CPlusPlus && 934 LHSExp->getType()->isRecordType() || 935 LHSExp->getType()->isEnumeralType() || 936 RHSExp->getType()->isRecordType() || 937 RHSExp->getType()->isEnumeralType()) { 938 // Add the appropriate overloaded operators (C++ [over.match.oper]) 939 // to the candidate set. 940 OverloadCandidateSet CandidateSet; 941 Expr *Args[2] = { LHSExp, RHSExp }; 942 AddOperatorCandidates(OO_Subscript, S, Args, 2, CandidateSet); 943 944 // Perform overload resolution. 945 OverloadCandidateSet::iterator Best; 946 switch (BestViableFunction(CandidateSet, Best)) { 947 case OR_Success: { 948 // We found a built-in operator or an overloaded operator. 949 FunctionDecl *FnDecl = Best->Function; 950 951 if (FnDecl) { 952 // We matched an overloaded operator. Build a call to that 953 // operator. 954 955 // Convert the arguments. 956 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 957 if (PerformObjectArgumentInitialization(LHSExp, Method) || 958 PerformCopyInitialization(RHSExp, 959 FnDecl->getParamDecl(0)->getType(), 960 "passing")) 961 return true; 962 } else { 963 // Convert the arguments. 964 if (PerformCopyInitialization(LHSExp, 965 FnDecl->getParamDecl(0)->getType(), 966 "passing") || 967 PerformCopyInitialization(RHSExp, 968 FnDecl->getParamDecl(1)->getType(), 969 "passing")) 970 return true; 971 } 972 973 // Determine the result type 974 QualType ResultTy 975 = FnDecl->getType()->getAsFunctionType()->getResultType(); 976 ResultTy = ResultTy.getNonReferenceType(); 977 978 // Build the actual expression node. 979 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 980 SourceLocation()); 981 UsualUnaryConversions(FnExpr); 982 983 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, LLoc); 984 } else { 985 // We matched a built-in operator. Convert the arguments, then 986 // break out so that we will build the appropriate built-in 987 // operator node. 988 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 989 "passing") || 990 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 991 "passing")) 992 return true; 993 994 break; 995 } 996 } 997 998 case OR_No_Viable_Function: 999 // No viable function; fall through to handling this as a 1000 // built-in operator, which will produce an error message for us. 1001 break; 1002 1003 case OR_Ambiguous: 1004 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1005 << "[]" 1006 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1007 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1008 return true; 1009 } 1010 1011 // Either we found no viable overloaded operator or we matched a 1012 // built-in operator. In either case, fall through to trying to 1013 // build a built-in operation. 1014 } 1015 1016 // Perform default conversions. 1017 DefaultFunctionArrayConversion(LHSExp); 1018 DefaultFunctionArrayConversion(RHSExp); 1019 1020 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1021 1022 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1023 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1024 // in the subscript position. As a result, we need to derive the array base 1025 // and index from the expression types. 1026 Expr *BaseExpr, *IndexExpr; 1027 QualType ResultType; 1028 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1029 BaseExpr = LHSExp; 1030 IndexExpr = RHSExp; 1031 // FIXME: need to deal with const... 1032 ResultType = PTy->getPointeeType(); 1033 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1034 // Handle the uncommon case of "123[Ptr]". 1035 BaseExpr = RHSExp; 1036 IndexExpr = LHSExp; 1037 // FIXME: need to deal with const... 1038 ResultType = PTy->getPointeeType(); 1039 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1040 BaseExpr = LHSExp; // vectors: V[123] 1041 IndexExpr = RHSExp; 1042 1043 // Component access limited to variables (reject vec4.rg[1]). 1044 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1045 !isa<ExtVectorElementExpr>(BaseExpr)) 1046 return Diag(LLoc, diag::err_ext_vector_component_access) 1047 << SourceRange(LLoc, RLoc); 1048 // FIXME: need to deal with const... 1049 ResultType = VTy->getElementType(); 1050 } else { 1051 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value) 1052 << RHSExp->getSourceRange(); 1053 } 1054 // C99 6.5.2.1p1 1055 if (!IndexExpr->getType()->isIntegerType()) 1056 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript) 1057 << IndexExpr->getSourceRange(); 1058 1059 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 1060 // the following check catches trying to index a pointer to a function (e.g. 1061 // void (*)(int)) and pointers to incomplete types. Functions are not 1062 // objects in C99. 1063 if (!ResultType->isObjectType()) 1064 return Diag(BaseExpr->getLocStart(), 1065 diag::err_typecheck_subscript_not_object) 1066 << BaseExpr->getType() << BaseExpr->getSourceRange(); 1067 1068 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 1069} 1070 1071QualType Sema:: 1072CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1073 IdentifierInfo &CompName, SourceLocation CompLoc) { 1074 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1075 1076 // This flag determines whether or not the component is to be treated as a 1077 // special name, or a regular GLSL-style component access. 1078 bool SpecialComponent = false; 1079 1080 // The vector accessor can't exceed the number of elements. 1081 const char *compStr = CompName.getName(); 1082 if (strlen(compStr) > vecType->getNumElements()) { 1083 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1084 << baseType << SourceRange(CompLoc); 1085 return QualType(); 1086 } 1087 1088 // Check that we've found one of the special components, or that the component 1089 // names must come from the same set. 1090 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1091 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 1092 SpecialComponent = true; 1093 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1094 do 1095 compStr++; 1096 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1097 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 1098 do 1099 compStr++; 1100 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 1101 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 1102 do 1103 compStr++; 1104 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 1105 } 1106 1107 if (!SpecialComponent && *compStr) { 1108 // We didn't get to the end of the string. This means the component names 1109 // didn't come from the same set *or* we encountered an illegal name. 1110 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1111 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1112 return QualType(); 1113 } 1114 // Each component accessor can't exceed the vector type. 1115 compStr = CompName.getName(); 1116 while (*compStr) { 1117 if (vecType->isAccessorWithinNumElements(*compStr)) 1118 compStr++; 1119 else 1120 break; 1121 } 1122 if (!SpecialComponent && *compStr) { 1123 // We didn't get to the end of the string. This means a component accessor 1124 // exceeds the number of elements in the vector. 1125 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1126 << baseType << SourceRange(CompLoc); 1127 return QualType(); 1128 } 1129 1130 // If we have a special component name, verify that the current vector length 1131 // is an even number, since all special component names return exactly half 1132 // the elements. 1133 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 1134 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1135 << baseType << SourceRange(CompLoc); 1136 return QualType(); 1137 } 1138 1139 // The component accessor looks fine - now we need to compute the actual type. 1140 // The vector type is implied by the component accessor. For example, 1141 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1142 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1143 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 1144 : CompName.getLength(); 1145 if (CompSize == 1) 1146 return vecType->getElementType(); 1147 1148 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1149 // Now look up the TypeDefDecl from the vector type. Without this, 1150 // diagostics look bad. We want extended vector types to appear built-in. 1151 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1152 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1153 return Context.getTypedefType(ExtVectorDecls[i]); 1154 } 1155 return VT; // should never get here (a typedef type should always be found). 1156} 1157 1158/// constructSetterName - Return the setter name for the given 1159/// identifier, i.e. "set" + Name where the initial character of Name 1160/// has been capitalized. 1161// FIXME: Merge with same routine in Parser. But where should this 1162// live? 1163static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 1164 const IdentifierInfo *Name) { 1165 llvm::SmallString<100> SelectorName; 1166 SelectorName = "set"; 1167 SelectorName.append(Name->getName(), Name->getName()+Name->getLength()); 1168 SelectorName[3] = toupper(SelectorName[3]); 1169 return &Idents.get(&SelectorName[0], &SelectorName[SelectorName.size()]); 1170} 1171 1172Action::ExprResult Sema:: 1173ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 1174 tok::TokenKind OpKind, SourceLocation MemberLoc, 1175 IdentifierInfo &Member) { 1176 Expr *BaseExpr = static_cast<Expr *>(Base); 1177 assert(BaseExpr && "no record expression"); 1178 1179 // Perform default conversions. 1180 DefaultFunctionArrayConversion(BaseExpr); 1181 1182 QualType BaseType = BaseExpr->getType(); 1183 assert(!BaseType.isNull() && "no type for member expression"); 1184 1185 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1186 // must have pointer type, and the accessed type is the pointee. 1187 if (OpKind == tok::arrow) { 1188 if (const PointerType *PT = BaseType->getAsPointerType()) 1189 BaseType = PT->getPointeeType(); 1190 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1191 return BuildOverloadedArrowExpr(BaseExpr, OpLoc, MemberLoc, Member); 1192 else 1193 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow) 1194 << BaseType << BaseExpr->getSourceRange(); 1195 } 1196 1197 // Handle field access to simple records. This also handles access to fields 1198 // of the ObjC 'id' struct. 1199 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1200 RecordDecl *RDecl = RTy->getDecl(); 1201 if (RTy->isIncompleteType()) 1202 return Diag(OpLoc, diag::err_typecheck_incomplete_tag) 1203 << RDecl->getDeclName() << BaseExpr->getSourceRange(); 1204 // The record definition is complete, now make sure the member is valid. 1205 FieldDecl *MemberDecl = RDecl->getMember(&Member); 1206 if (!MemberDecl) 1207 return Diag(MemberLoc, diag::err_typecheck_no_member) 1208 << &Member << BaseExpr->getSourceRange(); 1209 1210 // Figure out the type of the member; see C99 6.5.2.3p3 1211 // FIXME: Handle address space modifiers 1212 QualType MemberType = MemberDecl->getType(); 1213 unsigned combinedQualifiers = 1214 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1215 if (CXXFieldDecl *CXXMember = dyn_cast<CXXFieldDecl>(MemberDecl)) { 1216 if (CXXMember->isMutable()) 1217 combinedQualifiers &= ~QualType::Const; 1218 } 1219 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1220 1221 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 1222 MemberLoc, MemberType); 1223 } 1224 1225 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1226 // (*Obj).ivar. 1227 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1228 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) 1229 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 1230 OpKind == tok::arrow); 1231 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1232 << IFTy->getDecl()->getDeclName() << &Member 1233 << BaseExpr->getSourceRange(); 1234 } 1235 1236 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1237 // pointer to a (potentially qualified) interface type. 1238 const PointerType *PTy; 1239 const ObjCInterfaceType *IFTy; 1240 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1241 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1242 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1243 1244 // Search for a declared property first. 1245 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 1246 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1247 1248 // Check protocols on qualified interfaces. 1249 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1250 E = IFTy->qual_end(); I != E; ++I) 1251 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1252 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1253 1254 // If that failed, look for an "implicit" property by seeing if the nullary 1255 // selector is implemented. 1256 1257 // FIXME: The logic for looking up nullary and unary selectors should be 1258 // shared with the code in ActOnInstanceMessage. 1259 1260 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1261 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1262 1263 // If this reference is in an @implementation, check for 'private' methods. 1264 if (!Getter) 1265 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1266 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1267 if (ObjCImplementationDecl *ImpDecl = 1268 ObjCImplementations[ClassDecl->getIdentifier()]) 1269 Getter = ImpDecl->getInstanceMethod(Sel); 1270 1271 // Look through local category implementations associated with the class. 1272 if (!Getter) { 1273 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1274 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1275 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1276 } 1277 } 1278 if (Getter) { 1279 // If we found a getter then this may be a valid dot-reference, we 1280 // will look for the matching setter, in case it is needed. 1281 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 1282 &Member); 1283 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 1284 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1285 if (!Setter) { 1286 // If this reference is in an @implementation, also check for 'private' 1287 // methods. 1288 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1289 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1290 if (ObjCImplementationDecl *ImpDecl = 1291 ObjCImplementations[ClassDecl->getIdentifier()]) 1292 Setter = ImpDecl->getInstanceMethod(SetterSel); 1293 } 1294 // Look through local category implementations associated with the class. 1295 if (!Setter) { 1296 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 1297 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1298 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 1299 } 1300 } 1301 1302 // FIXME: we must check that the setter has property type. 1303 return new ObjCKVCRefExpr(Getter, Getter->getResultType(), Setter, 1304 MemberLoc, BaseExpr); 1305 } 1306 } 1307 // Handle properties on qualified "id" protocols. 1308 const ObjCQualifiedIdType *QIdTy; 1309 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1310 // Check protocols on qualified interfaces. 1311 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1312 E = QIdTy->qual_end(); I != E; ++I) { 1313 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1314 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1315 // Also must look for a getter name which uses property syntax. 1316 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1317 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1318 return new ObjCMessageExpr(BaseExpr, Sel, OMD->getResultType(), OMD, 1319 OpLoc, MemberLoc, NULL, 0); 1320 } 1321 } 1322 } 1323 // Handle 'field access' to vectors, such as 'V.xx'. 1324 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1325 // Component access limited to variables (reject vec4.rg.g). 1326 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1327 !isa<ExtVectorElementExpr>(BaseExpr)) 1328 return Diag(MemberLoc, diag::err_ext_vector_component_access) 1329 << BaseExpr->getSourceRange(); 1330 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1331 if (ret.isNull()) 1332 return true; 1333 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1334 } 1335 1336 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 1337 << BaseType << BaseExpr->getSourceRange(); 1338} 1339 1340/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1341/// This provides the location of the left/right parens and a list of comma 1342/// locations. 1343Action::ExprResult Sema:: 1344ActOnCallExpr(Scope *S, ExprTy *fn, SourceLocation LParenLoc, 1345 ExprTy **args, unsigned NumArgs, 1346 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1347 Expr *Fn = static_cast<Expr *>(fn); 1348 Expr **Args = reinterpret_cast<Expr**>(args); 1349 assert(Fn && "no function call expression"); 1350 FunctionDecl *FDecl = NULL; 1351 OverloadedFunctionDecl *Ovl = NULL; 1352 1353 // Determine whether this is a dependent call inside a C++ template, 1354 // in which case we won't do any semantic analysis now. 1355 bool Dependent = false; 1356 if (Fn->isTypeDependent()) { 1357 if (CXXDependentNameExpr *FnName = dyn_cast<CXXDependentNameExpr>(Fn)) { 1358 if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 1359 Dependent = true; 1360 else { 1361 // Resolve the CXXDependentNameExpr to an actual identifier; 1362 // it wasn't really a dependent name after all. 1363 ExprResult Resolved 1364 = ActOnDeclarationNameExpr(S, FnName->getLocation(), FnName->getName(), 1365 /*HasTrailingLParen=*/true, 1366 /*SS=*/0, 1367 /*ForceResolution=*/true); 1368 if (Resolved.isInvalid) 1369 return true; 1370 else { 1371 delete Fn; 1372 Fn = (Expr *)Resolved.Val; 1373 } 1374 } 1375 } else 1376 Dependent = true; 1377 } else 1378 Dependent = Expr::hasAnyTypeDependentArguments(Args, NumArgs); 1379 1380 // FIXME: Will need to cache the results of name lookup (including 1381 // ADL) in Fn. 1382 if (Dependent) 1383 return new CallExpr(Fn, Args, NumArgs, Context.DependentTy, RParenLoc); 1384 1385 // If we're directly calling a function or a set of overloaded 1386 // functions, get the appropriate declaration. 1387 { 1388 DeclRefExpr *DRExpr = NULL; 1389 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1390 DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()); 1391 else 1392 DRExpr = dyn_cast<DeclRefExpr>(Fn); 1393 1394 if (DRExpr) { 1395 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1396 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1397 } 1398 } 1399 1400 if (Ovl) { 1401 FDecl = ResolveOverloadedCallFn(Fn, Ovl, LParenLoc, Args, NumArgs, CommaLocs, 1402 RParenLoc); 1403 if (!FDecl) 1404 return true; 1405 1406 // Update Fn to refer to the actual function selected. 1407 Expr *NewFn = new DeclRefExpr(FDecl, FDecl->getType(), 1408 Fn->getSourceRange().getBegin()); 1409 Fn->Destroy(Context); 1410 Fn = NewFn; 1411 } 1412 1413 if (getLangOptions().CPlusPlus && Fn->getType()->isRecordType()) 1414 return BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 1415 CommaLocs, RParenLoc); 1416 1417 // Promote the function operand. 1418 UsualUnaryConversions(Fn); 1419 1420 // Make the call expr early, before semantic checks. This guarantees cleanup 1421 // of arguments and function on error. 1422 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1423 Context.BoolTy, RParenLoc)); 1424 1425 const FunctionType *FuncT; 1426 if (!Fn->getType()->isBlockPointerType()) { 1427 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1428 // have type pointer to function". 1429 const PointerType *PT = Fn->getType()->getAsPointerType(); 1430 if (PT == 0) 1431 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1432 << Fn->getType() << Fn->getSourceRange(); 1433 FuncT = PT->getPointeeType()->getAsFunctionType(); 1434 } else { // This is a block call. 1435 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1436 getAsFunctionType(); 1437 } 1438 if (FuncT == 0) 1439 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1440 << Fn->getType() << Fn->getSourceRange(); 1441 1442 // We know the result type of the call, set it. 1443 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 1444 1445 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1446 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1447 // assignment, to the types of the corresponding parameter, ... 1448 unsigned NumArgsInProto = Proto->getNumArgs(); 1449 unsigned NumArgsToCheck = NumArgs; 1450 1451 // If too few arguments are available (and we don't have default 1452 // arguments for the remaining parameters), don't make the call. 1453 if (NumArgs < NumArgsInProto) { 1454 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 1455 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 1456 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 1457 // Use default arguments for missing arguments 1458 NumArgsToCheck = NumArgsInProto; 1459 TheCall->setNumArgs(NumArgsInProto); 1460 } 1461 1462 // If too many are passed and not variadic, error on the extras and drop 1463 // them. 1464 if (NumArgs > NumArgsInProto) { 1465 if (!Proto->isVariadic()) { 1466 Diag(Args[NumArgsInProto]->getLocStart(), 1467 diag::err_typecheck_call_too_many_args) 1468 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 1469 << SourceRange(Args[NumArgsInProto]->getLocStart(), 1470 Args[NumArgs-1]->getLocEnd()); 1471 // This deletes the extra arguments. 1472 TheCall->setNumArgs(NumArgsInProto); 1473 } 1474 NumArgsToCheck = NumArgsInProto; 1475 } 1476 1477 // Continue to check argument types (even if we have too few/many args). 1478 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1479 QualType ProtoArgType = Proto->getArgType(i); 1480 1481 Expr *Arg; 1482 if (i < NumArgs) 1483 Arg = Args[i]; 1484 else 1485 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1486 QualType ArgType = Arg->getType(); 1487 1488 // Pass the argument. 1489 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 1490 return true; 1491 1492 TheCall->setArg(i, Arg); 1493 } 1494 1495 // If this is a variadic call, handle args passed through "...". 1496 if (Proto->isVariadic()) { 1497 // Promote the arguments (C99 6.5.2.2p7). 1498 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1499 Expr *Arg = Args[i]; 1500 DefaultArgumentPromotion(Arg); 1501 TheCall->setArg(i, Arg); 1502 } 1503 } 1504 } else { 1505 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1506 1507 // Promote the arguments (C99 6.5.2.2p6). 1508 for (unsigned i = 0; i != NumArgs; i++) { 1509 Expr *Arg = Args[i]; 1510 DefaultArgumentPromotion(Arg); 1511 TheCall->setArg(i, Arg); 1512 } 1513 } 1514 1515 // Do special checking on direct calls to functions. 1516 if (FDecl) 1517 return CheckFunctionCall(FDecl, TheCall.take()); 1518 1519 return TheCall.take(); 1520} 1521 1522Action::ExprResult Sema:: 1523ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1524 SourceLocation RParenLoc, ExprTy *InitExpr) { 1525 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1526 QualType literalType = QualType::getFromOpaquePtr(Ty); 1527 // FIXME: put back this assert when initializers are worked out. 1528 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1529 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1530 1531 if (literalType->isArrayType()) { 1532 if (literalType->isVariableArrayType()) 1533 return Diag(LParenLoc, diag::err_variable_object_no_init) 1534 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1535 } else if (literalType->isIncompleteType()) { 1536 return Diag(LParenLoc, diag::err_typecheck_decl_incomplete_type) 1537 << literalType 1538 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1539 } 1540 1541 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 1542 DeclarationName())) 1543 return true; 1544 1545 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 1546 if (isFileScope) { // 6.5.2.5p3 1547 if (CheckForConstantInitializer(literalExpr, literalType)) 1548 return true; 1549 } 1550 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, 1551 isFileScope); 1552} 1553 1554Action::ExprResult Sema:: 1555ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1556 InitListDesignations &Designators, 1557 SourceLocation RBraceLoc) { 1558 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1559 1560 // Semantic analysis for initializers is done by ActOnDeclarator() and 1561 // CheckInitializer() - it requires knowledge of the object being intialized. 1562 1563 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc, 1564 Designators.hasAnyDesignators()); 1565 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1566 return E; 1567} 1568 1569/// CheckCastTypes - Check type constraints for casting between types. 1570bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1571 UsualUnaryConversions(castExpr); 1572 1573 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1574 // type needs to be scalar. 1575 if (castType->isVoidType()) { 1576 // Cast to void allows any expr type. 1577 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 1578 // We can't check any more until template instantiation time. 1579 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1580 // GCC struct/union extension: allow cast to self. 1581 if (Context.getCanonicalType(castType) != 1582 Context.getCanonicalType(castExpr->getType()) || 1583 (!castType->isStructureType() && !castType->isUnionType())) { 1584 // Reject any other conversions to non-scalar types. 1585 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 1586 << castType << castExpr->getSourceRange(); 1587 } 1588 1589 // accept this, but emit an ext-warn. 1590 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 1591 << castType << castExpr->getSourceRange(); 1592 } else if (!castExpr->getType()->isScalarType() && 1593 !castExpr->getType()->isVectorType()) { 1594 return Diag(castExpr->getLocStart(), 1595 diag::err_typecheck_expect_scalar_operand) 1596 << castExpr->getType() << castExpr->getSourceRange(); 1597 } else if (castExpr->getType()->isVectorType()) { 1598 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1599 return true; 1600 } else if (castType->isVectorType()) { 1601 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1602 return true; 1603 } 1604 return false; 1605} 1606 1607bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1608 assert(VectorTy->isVectorType() && "Not a vector type!"); 1609 1610 if (Ty->isVectorType() || Ty->isIntegerType()) { 1611 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1612 return Diag(R.getBegin(), 1613 Ty->isVectorType() ? 1614 diag::err_invalid_conversion_between_vectors : 1615 diag::err_invalid_conversion_between_vector_and_integer) 1616 << VectorTy << Ty << R; 1617 } else 1618 return Diag(R.getBegin(), 1619 diag::err_invalid_conversion_between_vector_and_scalar) 1620 << VectorTy << Ty << R; 1621 1622 return false; 1623} 1624 1625Action::ExprResult Sema:: 1626ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1627 SourceLocation RParenLoc, ExprTy *Op) { 1628 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1629 1630 Expr *castExpr = static_cast<Expr*>(Op); 1631 QualType castType = QualType::getFromOpaquePtr(Ty); 1632 1633 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1634 return true; 1635 return new CStyleCastExpr(castType, castExpr, castType, LParenLoc, RParenLoc); 1636} 1637 1638/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1639/// In that case, lex = cond. 1640inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1641 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1642 UsualUnaryConversions(cond); 1643 UsualUnaryConversions(lex); 1644 UsualUnaryConversions(rex); 1645 QualType condT = cond->getType(); 1646 QualType lexT = lex->getType(); 1647 QualType rexT = rex->getType(); 1648 1649 // first, check the condition. 1650 if (!cond->isTypeDependent()) { 1651 if (!condT->isScalarType()) { // C99 6.5.15p2 1652 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) << condT; 1653 return QualType(); 1654 } 1655 } 1656 1657 // Now check the two expressions. 1658 if ((lex && lex->isTypeDependent()) || (rex && rex->isTypeDependent())) 1659 return Context.DependentTy; 1660 1661 // If both operands have arithmetic type, do the usual arithmetic conversions 1662 // to find a common type: C99 6.5.15p3,5. 1663 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1664 UsualArithmeticConversions(lex, rex); 1665 return lex->getType(); 1666 } 1667 1668 // If both operands are the same structure or union type, the result is that 1669 // type. 1670 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1671 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1672 if (LHSRT->getDecl() == RHSRT->getDecl()) 1673 // "If both the operands have structure or union type, the result has 1674 // that type." This implies that CV qualifiers are dropped. 1675 return lexT.getUnqualifiedType(); 1676 } 1677 1678 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1679 // The following || allows only one side to be void (a GCC-ism). 1680 if (lexT->isVoidType() || rexT->isVoidType()) { 1681 if (!lexT->isVoidType()) 1682 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void) 1683 << rex->getSourceRange(); 1684 if (!rexT->isVoidType()) 1685 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void) 1686 << lex->getSourceRange(); 1687 ImpCastExprToType(lex, Context.VoidTy); 1688 ImpCastExprToType(rex, Context.VoidTy); 1689 return Context.VoidTy; 1690 } 1691 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1692 // the type of the other operand." 1693 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1694 Context.isObjCObjectPointerType(lexT)) && 1695 rex->isNullPointerConstant(Context)) { 1696 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1697 return lexT; 1698 } 1699 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1700 Context.isObjCObjectPointerType(rexT)) && 1701 lex->isNullPointerConstant(Context)) { 1702 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1703 return rexT; 1704 } 1705 // Handle the case where both operands are pointers before we handle null 1706 // pointer constants in case both operands are null pointer constants. 1707 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1708 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1709 // get the "pointed to" types 1710 QualType lhptee = LHSPT->getPointeeType(); 1711 QualType rhptee = RHSPT->getPointeeType(); 1712 1713 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1714 if (lhptee->isVoidType() && 1715 rhptee->isIncompleteOrObjectType()) { 1716 // Figure out necessary qualifiers (C99 6.5.15p6) 1717 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1718 QualType destType = Context.getPointerType(destPointee); 1719 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1720 ImpCastExprToType(rex, destType); // promote to void* 1721 return destType; 1722 } 1723 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1724 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1725 QualType destType = Context.getPointerType(destPointee); 1726 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1727 ImpCastExprToType(rex, destType); // promote to void* 1728 return destType; 1729 } 1730 1731 QualType compositeType = lexT; 1732 1733 // If either type is an Objective-C object type then check 1734 // compatibility according to Objective-C. 1735 if (Context.isObjCObjectPointerType(lexT) || 1736 Context.isObjCObjectPointerType(rexT)) { 1737 // If both operands are interfaces and either operand can be 1738 // assigned to the other, use that type as the composite 1739 // type. This allows 1740 // xxx ? (A*) a : (B*) b 1741 // where B is a subclass of A. 1742 // 1743 // Additionally, as for assignment, if either type is 'id' 1744 // allow silent coercion. Finally, if the types are 1745 // incompatible then make sure to use 'id' as the composite 1746 // type so the result is acceptable for sending messages to. 1747 1748 // FIXME: This code should not be localized to here. Also this 1749 // should use a compatible check instead of abusing the 1750 // canAssignObjCInterfaces code. 1751 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1752 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1753 if (LHSIface && RHSIface && 1754 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1755 compositeType = lexT; 1756 } else if (LHSIface && RHSIface && 1757 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 1758 compositeType = rexT; 1759 } else if (Context.isObjCIdType(lhptee) || 1760 Context.isObjCIdType(rhptee)) { 1761 // FIXME: This code looks wrong, because isObjCIdType checks 1762 // the struct but getObjCIdType returns the pointer to 1763 // struct. This is horrible and should be fixed. 1764 compositeType = Context.getObjCIdType(); 1765 } else { 1766 QualType incompatTy = Context.getObjCIdType(); 1767 ImpCastExprToType(lex, incompatTy); 1768 ImpCastExprToType(rex, incompatTy); 1769 return incompatTy; 1770 } 1771 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1772 rhptee.getUnqualifiedType())) { 1773 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers) 1774 << lexT << rexT << lex->getSourceRange() << rex->getSourceRange(); 1775 // In this situation, we assume void* type. No especially good 1776 // reason, but this is what gcc does, and we do have to pick 1777 // to get a consistent AST. 1778 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1779 ImpCastExprToType(lex, incompatTy); 1780 ImpCastExprToType(rex, incompatTy); 1781 return incompatTy; 1782 } 1783 // The pointer types are compatible. 1784 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1785 // differently qualified versions of compatible types, the result type is 1786 // a pointer to an appropriately qualified version of the *composite* 1787 // type. 1788 // FIXME: Need to calculate the composite type. 1789 // FIXME: Need to add qualifiers 1790 ImpCastExprToType(lex, compositeType); 1791 ImpCastExprToType(rex, compositeType); 1792 return compositeType; 1793 } 1794 } 1795 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1796 // evaluates to "struct objc_object *" (and is handled above when comparing 1797 // id with statically typed objects). 1798 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1799 // GCC allows qualified id and any Objective-C type to devolve to 1800 // id. Currently localizing to here until clear this should be 1801 // part of ObjCQualifiedIdTypesAreCompatible. 1802 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1803 (lexT->isObjCQualifiedIdType() && 1804 Context.isObjCObjectPointerType(rexT)) || 1805 (rexT->isObjCQualifiedIdType() && 1806 Context.isObjCObjectPointerType(lexT))) { 1807 // FIXME: This is not the correct composite type. This only 1808 // happens to work because id can more or less be used anywhere, 1809 // however this may change the type of method sends. 1810 // FIXME: gcc adds some type-checking of the arguments and emits 1811 // (confusing) incompatible comparison warnings in some 1812 // cases. Investigate. 1813 QualType compositeType = Context.getObjCIdType(); 1814 ImpCastExprToType(lex, compositeType); 1815 ImpCastExprToType(rex, compositeType); 1816 return compositeType; 1817 } 1818 } 1819 1820 // Selection between block pointer types is ok as long as they are the same. 1821 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1822 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1823 return lexT; 1824 1825 // Otherwise, the operands are not compatible. 1826 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands) 1827 << lexT << rexT << lex->getSourceRange() << rex->getSourceRange(); 1828 return QualType(); 1829} 1830 1831/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1832/// in the case of a the GNU conditional expr extension. 1833Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1834 SourceLocation ColonLoc, 1835 ExprTy *Cond, ExprTy *LHS, 1836 ExprTy *RHS) { 1837 Expr *CondExpr = (Expr *) Cond; 1838 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1839 1840 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1841 // was the condition. 1842 bool isLHSNull = LHSExpr == 0; 1843 if (isLHSNull) 1844 LHSExpr = CondExpr; 1845 1846 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1847 RHSExpr, QuestionLoc); 1848 if (result.isNull()) 1849 return true; 1850 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1851 RHSExpr, result); 1852} 1853 1854 1855// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1856// being closely modeled after the C99 spec:-). The odd characteristic of this 1857// routine is it effectively iqnores the qualifiers on the top level pointee. 1858// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1859// FIXME: add a couple examples in this comment. 1860Sema::AssignConvertType 1861Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1862 QualType lhptee, rhptee; 1863 1864 // get the "pointed to" type (ignoring qualifiers at the top level) 1865 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1866 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1867 1868 // make sure we operate on the canonical type 1869 lhptee = Context.getCanonicalType(lhptee); 1870 rhptee = Context.getCanonicalType(rhptee); 1871 1872 AssignConvertType ConvTy = Compatible; 1873 1874 // C99 6.5.16.1p1: This following citation is common to constraints 1875 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1876 // qualifiers of the type *pointed to* by the right; 1877 // FIXME: Handle ASQualType 1878 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 1879 ConvTy = CompatiblePointerDiscardsQualifiers; 1880 1881 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1882 // incomplete type and the other is a pointer to a qualified or unqualified 1883 // version of void... 1884 if (lhptee->isVoidType()) { 1885 if (rhptee->isIncompleteOrObjectType()) 1886 return ConvTy; 1887 1888 // As an extension, we allow cast to/from void* to function pointer. 1889 assert(rhptee->isFunctionType()); 1890 return FunctionVoidPointer; 1891 } 1892 1893 if (rhptee->isVoidType()) { 1894 if (lhptee->isIncompleteOrObjectType()) 1895 return ConvTy; 1896 1897 // As an extension, we allow cast to/from void* to function pointer. 1898 assert(lhptee->isFunctionType()); 1899 return FunctionVoidPointer; 1900 } 1901 1902 // Check for ObjC interfaces 1903 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1904 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1905 if (LHSIface && RHSIface && 1906 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1907 return ConvTy; 1908 1909 // ID acts sort of like void* for ObjC interfaces 1910 if (LHSIface && Context.isObjCIdType(rhptee)) 1911 return ConvTy; 1912 if (RHSIface && Context.isObjCIdType(lhptee)) 1913 return ConvTy; 1914 1915 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1916 // unqualified versions of compatible types, ... 1917 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1918 rhptee.getUnqualifiedType())) 1919 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1920 return ConvTy; 1921} 1922 1923/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1924/// block pointer types are compatible or whether a block and normal pointer 1925/// are compatible. It is more restrict than comparing two function pointer 1926// types. 1927Sema::AssignConvertType 1928Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1929 QualType rhsType) { 1930 QualType lhptee, rhptee; 1931 1932 // get the "pointed to" type (ignoring qualifiers at the top level) 1933 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1934 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1935 1936 // make sure we operate on the canonical type 1937 lhptee = Context.getCanonicalType(lhptee); 1938 rhptee = Context.getCanonicalType(rhptee); 1939 1940 AssignConvertType ConvTy = Compatible; 1941 1942 // For blocks we enforce that qualifiers are identical. 1943 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1944 ConvTy = CompatiblePointerDiscardsQualifiers; 1945 1946 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1947 return IncompatibleBlockPointer; 1948 return ConvTy; 1949} 1950 1951/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1952/// has code to accommodate several GCC extensions when type checking 1953/// pointers. Here are some objectionable examples that GCC considers warnings: 1954/// 1955/// int a, *pint; 1956/// short *pshort; 1957/// struct foo *pfoo; 1958/// 1959/// pint = pshort; // warning: assignment from incompatible pointer type 1960/// a = pint; // warning: assignment makes integer from pointer without a cast 1961/// pint = a; // warning: assignment makes pointer from integer without a cast 1962/// pint = pfoo; // warning: assignment from incompatible pointer type 1963/// 1964/// As a result, the code for dealing with pointers is more complex than the 1965/// C99 spec dictates. 1966/// 1967Sema::AssignConvertType 1968Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1969 // Get canonical types. We're not formatting these types, just comparing 1970 // them. 1971 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1972 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1973 1974 if (lhsType == rhsType) 1975 return Compatible; // Common case: fast path an exact match. 1976 1977 // If the left-hand side is a reference type, then we are in a 1978 // (rare!) case where we've allowed the use of references in C, 1979 // e.g., as a parameter type in a built-in function. In this case, 1980 // just make sure that the type referenced is compatible with the 1981 // right-hand side type. The caller is responsible for adjusting 1982 // lhsType so that the resulting expression does not have reference 1983 // type. 1984 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 1985 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 1986 return Compatible; 1987 return Incompatible; 1988 } 1989 1990 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1991 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1992 return Compatible; 1993 // Relax integer conversions like we do for pointers below. 1994 if (rhsType->isIntegerType()) 1995 return IntToPointer; 1996 if (lhsType->isIntegerType()) 1997 return PointerToInt; 1998 return IncompatibleObjCQualifiedId; 1999 } 2000 2001 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2002 // For ExtVector, allow vector splats; float -> <n x float> 2003 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2004 if (LV->getElementType() == rhsType) 2005 return Compatible; 2006 2007 // If we are allowing lax vector conversions, and LHS and RHS are both 2008 // vectors, the total size only needs to be the same. This is a bitcast; 2009 // no bits are changed but the result type is different. 2010 if (getLangOptions().LaxVectorConversions && 2011 lhsType->isVectorType() && rhsType->isVectorType()) { 2012 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2013 return Compatible; 2014 } 2015 return Incompatible; 2016 } 2017 2018 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2019 return Compatible; 2020 2021 if (isa<PointerType>(lhsType)) { 2022 if (rhsType->isIntegerType()) 2023 return IntToPointer; 2024 2025 if (isa<PointerType>(rhsType)) 2026 return CheckPointerTypesForAssignment(lhsType, rhsType); 2027 2028 if (rhsType->getAsBlockPointerType()) { 2029 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2030 return Compatible; 2031 2032 // Treat block pointers as objects. 2033 if (getLangOptions().ObjC1 && 2034 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2035 return Compatible; 2036 } 2037 return Incompatible; 2038 } 2039 2040 if (isa<BlockPointerType>(lhsType)) { 2041 if (rhsType->isIntegerType()) 2042 return IntToPointer; 2043 2044 // Treat block pointers as objects. 2045 if (getLangOptions().ObjC1 && 2046 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2047 return Compatible; 2048 2049 if (rhsType->isBlockPointerType()) 2050 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2051 2052 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2053 if (RHSPT->getPointeeType()->isVoidType()) 2054 return Compatible; 2055 } 2056 return Incompatible; 2057 } 2058 2059 if (isa<PointerType>(rhsType)) { 2060 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2061 if (lhsType == Context.BoolTy) 2062 return Compatible; 2063 2064 if (lhsType->isIntegerType()) 2065 return PointerToInt; 2066 2067 if (isa<PointerType>(lhsType)) 2068 return CheckPointerTypesForAssignment(lhsType, rhsType); 2069 2070 if (isa<BlockPointerType>(lhsType) && 2071 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2072 return Compatible; 2073 return Incompatible; 2074 } 2075 2076 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 2077 if (Context.typesAreCompatible(lhsType, rhsType)) 2078 return Compatible; 2079 } 2080 return Incompatible; 2081} 2082 2083Sema::AssignConvertType 2084Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2085 if (getLangOptions().CPlusPlus) { 2086 if (!lhsType->isRecordType()) { 2087 // C++ 5.17p3: If the left operand is not of class type, the 2088 // expression is implicitly converted (C++ 4) to the 2089 // cv-unqualified type of the left operand. 2090 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType())) 2091 return Incompatible; 2092 else 2093 return Compatible; 2094 } 2095 2096 // FIXME: Currently, we fall through and treat C++ classes like C 2097 // structures. 2098 } 2099 2100 // C99 6.5.16.1p1: the left operand is a pointer and the right is 2101 // a null pointer constant. 2102 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 2103 lhsType->isBlockPointerType()) 2104 && rExpr->isNullPointerConstant(Context)) { 2105 ImpCastExprToType(rExpr, lhsType); 2106 return Compatible; 2107 } 2108 2109 // We don't allow conversion of non-null-pointer constants to integers. 2110 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 2111 return IntToBlockPointer; 2112 2113 // This check seems unnatural, however it is necessary to ensure the proper 2114 // conversion of functions/arrays. If the conversion were done for all 2115 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 2116 // expressions that surpress this implicit conversion (&, sizeof). 2117 // 2118 // Suppress this for references: C++ 8.5.3p5. 2119 if (!lhsType->isReferenceType()) 2120 DefaultFunctionArrayConversion(rExpr); 2121 2122 Sema::AssignConvertType result = 2123 CheckAssignmentConstraints(lhsType, rExpr->getType()); 2124 2125 // C99 6.5.16.1p2: The value of the right operand is converted to the 2126 // type of the assignment expression. 2127 // CheckAssignmentConstraints allows the left-hand side to be a reference, 2128 // so that we can use references in built-in functions even in C. 2129 // The getNonReferenceType() call makes sure that the resulting expression 2130 // does not have reference type. 2131 if (rExpr->getType() != lhsType) 2132 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 2133 return result; 2134} 2135 2136Sema::AssignConvertType 2137Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 2138 return CheckAssignmentConstraints(lhsType, rhsType); 2139} 2140 2141QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 2142 Diag(Loc, diag::err_typecheck_invalid_operands) 2143 << lex->getType() << rex->getType() 2144 << lex->getSourceRange() << rex->getSourceRange(); 2145 return QualType(); 2146} 2147 2148inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 2149 Expr *&rex) { 2150 // For conversion purposes, we ignore any qualifiers. 2151 // For example, "const float" and "float" are equivalent. 2152 QualType lhsType = 2153 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 2154 QualType rhsType = 2155 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 2156 2157 // If the vector types are identical, return. 2158 if (lhsType == rhsType) 2159 return lhsType; 2160 2161 // Handle the case of a vector & extvector type of the same size and element 2162 // type. It would be nice if we only had one vector type someday. 2163 if (getLangOptions().LaxVectorConversions) 2164 if (const VectorType *LV = lhsType->getAsVectorType()) 2165 if (const VectorType *RV = rhsType->getAsVectorType()) 2166 if (LV->getElementType() == RV->getElementType() && 2167 LV->getNumElements() == RV->getNumElements()) 2168 return lhsType->isExtVectorType() ? lhsType : rhsType; 2169 2170 // If the lhs is an extended vector and the rhs is a scalar of the same type 2171 // or a literal, promote the rhs to the vector type. 2172 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 2173 QualType eltType = V->getElementType(); 2174 2175 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 2176 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 2177 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 2178 ImpCastExprToType(rex, lhsType); 2179 return lhsType; 2180 } 2181 } 2182 2183 // If the rhs is an extended vector and the lhs is a scalar of the same type, 2184 // promote the lhs to the vector type. 2185 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 2186 QualType eltType = V->getElementType(); 2187 2188 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 2189 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 2190 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 2191 ImpCastExprToType(lex, rhsType); 2192 return rhsType; 2193 } 2194 } 2195 2196 // You cannot convert between vector values of different size. 2197 Diag(Loc, diag::err_typecheck_vector_not_convertable) 2198 << lex->getType() << rex->getType() 2199 << lex->getSourceRange() << rex->getSourceRange(); 2200 return QualType(); 2201} 2202 2203inline QualType Sema::CheckMultiplyDivideOperands( 2204 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2205{ 2206 QualType lhsType = lex->getType(), rhsType = rex->getType(); 2207 2208 if (lhsType->isVectorType() || rhsType->isVectorType()) 2209 return CheckVectorOperands(Loc, lex, rex); 2210 2211 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2212 2213 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2214 return compType; 2215 return InvalidOperands(Loc, lex, rex); 2216} 2217 2218inline QualType Sema::CheckRemainderOperands( 2219 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2220{ 2221 QualType lhsType = lex->getType(), rhsType = rex->getType(); 2222 2223 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2224 2225 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2226 return compType; 2227 return InvalidOperands(Loc, lex, rex); 2228} 2229 2230inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 2231 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2232{ 2233 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2234 return CheckVectorOperands(Loc, lex, rex); 2235 2236 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2237 2238 // handle the common case first (both operands are arithmetic). 2239 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2240 return compType; 2241 2242 // Put any potential pointer into PExp 2243 Expr* PExp = lex, *IExp = rex; 2244 if (IExp->getType()->isPointerType()) 2245 std::swap(PExp, IExp); 2246 2247 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 2248 if (IExp->getType()->isIntegerType()) { 2249 // Check for arithmetic on pointers to incomplete types 2250 if (!PTy->getPointeeType()->isObjectType()) { 2251 if (PTy->getPointeeType()->isVoidType()) { 2252 Diag(Loc, diag::ext_gnu_void_ptr) 2253 << lex->getSourceRange() << rex->getSourceRange(); 2254 } else { 2255 Diag(Loc, diag::err_typecheck_arithmetic_incomplete_type) 2256 << lex->getType() << lex->getSourceRange(); 2257 return QualType(); 2258 } 2259 } 2260 return PExp->getType(); 2261 } 2262 } 2263 2264 return InvalidOperands(Loc, lex, rex); 2265} 2266 2267// C99 6.5.6 2268QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 2269 SourceLocation Loc, bool isCompAssign) { 2270 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2271 return CheckVectorOperands(Loc, lex, rex); 2272 2273 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2274 2275 // Enforce type constraints: C99 6.5.6p3. 2276 2277 // Handle the common case first (both operands are arithmetic). 2278 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2279 return compType; 2280 2281 // Either ptr - int or ptr - ptr. 2282 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 2283 QualType lpointee = LHSPTy->getPointeeType(); 2284 2285 // The LHS must be an object type, not incomplete, function, etc. 2286 if (!lpointee->isObjectType()) { 2287 // Handle the GNU void* extension. 2288 if (lpointee->isVoidType()) { 2289 Diag(Loc, diag::ext_gnu_void_ptr) 2290 << lex->getSourceRange() << rex->getSourceRange(); 2291 } else { 2292 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2293 << lex->getType() << lex->getSourceRange(); 2294 return QualType(); 2295 } 2296 } 2297 2298 // The result type of a pointer-int computation is the pointer type. 2299 if (rex->getType()->isIntegerType()) 2300 return lex->getType(); 2301 2302 // Handle pointer-pointer subtractions. 2303 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 2304 QualType rpointee = RHSPTy->getPointeeType(); 2305 2306 // RHS must be an object type, unless void (GNU). 2307 if (!rpointee->isObjectType()) { 2308 // Handle the GNU void* extension. 2309 if (rpointee->isVoidType()) { 2310 if (!lpointee->isVoidType()) 2311 Diag(Loc, diag::ext_gnu_void_ptr) 2312 << lex->getSourceRange() << rex->getSourceRange(); 2313 } else { 2314 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2315 << rex->getType() << rex->getSourceRange(); 2316 return QualType(); 2317 } 2318 } 2319 2320 // Pointee types must be compatible. 2321 if (!Context.typesAreCompatible( 2322 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2323 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2324 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 2325 << lex->getType() << rex->getType() 2326 << lex->getSourceRange() << rex->getSourceRange(); 2327 return QualType(); 2328 } 2329 2330 return Context.getPointerDiffType(); 2331 } 2332 } 2333 2334 return InvalidOperands(Loc, lex, rex); 2335} 2336 2337// C99 6.5.7 2338QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2339 bool isCompAssign) { 2340 // C99 6.5.7p2: Each of the operands shall have integer type. 2341 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2342 return InvalidOperands(Loc, lex, rex); 2343 2344 // Shifts don't perform usual arithmetic conversions, they just do integer 2345 // promotions on each operand. C99 6.5.7p3 2346 if (!isCompAssign) 2347 UsualUnaryConversions(lex); 2348 UsualUnaryConversions(rex); 2349 2350 // "The type of the result is that of the promoted left operand." 2351 return lex->getType(); 2352} 2353 2354static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 2355 ASTContext& Context) { 2356 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2357 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2358 // ID acts sort of like void* for ObjC interfaces 2359 if (LHSIface && Context.isObjCIdType(RHS)) 2360 return true; 2361 if (RHSIface && Context.isObjCIdType(LHS)) 2362 return true; 2363 if (!LHSIface || !RHSIface) 2364 return false; 2365 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 2366 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 2367} 2368 2369// C99 6.5.8 2370QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2371 bool isRelational) { 2372 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2373 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 2374 2375 // C99 6.5.8p3 / C99 6.5.9p4 2376 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2377 UsualArithmeticConversions(lex, rex); 2378 else { 2379 UsualUnaryConversions(lex); 2380 UsualUnaryConversions(rex); 2381 } 2382 QualType lType = lex->getType(); 2383 QualType rType = rex->getType(); 2384 2385 // For non-floating point types, check for self-comparisons of the form 2386 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2387 // often indicate logic errors in the program. 2388 if (!lType->isFloatingType()) { 2389 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2390 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2391 if (DRL->getDecl() == DRR->getDecl()) 2392 Diag(Loc, diag::warn_selfcomparison); 2393 } 2394 2395 // The result of comparisons is 'bool' in C++, 'int' in C. 2396 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy : Context.IntTy; 2397 2398 if (isRelational) { 2399 if (lType->isRealType() && rType->isRealType()) 2400 return ResultTy; 2401 } else { 2402 // Check for comparisons of floating point operands using != and ==. 2403 if (lType->isFloatingType()) { 2404 assert (rType->isFloatingType()); 2405 CheckFloatComparison(Loc,lex,rex); 2406 } 2407 2408 if (lType->isArithmeticType() && rType->isArithmeticType()) 2409 return ResultTy; 2410 } 2411 2412 bool LHSIsNull = lex->isNullPointerConstant(Context); 2413 bool RHSIsNull = rex->isNullPointerConstant(Context); 2414 2415 // All of the following pointer related warnings are GCC extensions, except 2416 // when handling null pointer constants. One day, we can consider making them 2417 // errors (when -pedantic-errors is enabled). 2418 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2419 QualType LCanPointeeTy = 2420 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2421 QualType RCanPointeeTy = 2422 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2423 2424 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2425 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2426 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2427 RCanPointeeTy.getUnqualifiedType()) && 2428 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2429 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2430 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2431 } 2432 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2433 return ResultTy; 2434 } 2435 // Handle block pointer types. 2436 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2437 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2438 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2439 2440 if (!LHSIsNull && !RHSIsNull && 2441 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2442 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2443 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2444 } 2445 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2446 return ResultTy; 2447 } 2448 // Allow block pointers to be compared with null pointer constants. 2449 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2450 (lType->isPointerType() && rType->isBlockPointerType())) { 2451 if (!LHSIsNull && !RHSIsNull) { 2452 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2453 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2454 } 2455 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2456 return ResultTy; 2457 } 2458 2459 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2460 if (lType->isPointerType() || rType->isPointerType()) { 2461 const PointerType *LPT = lType->getAsPointerType(); 2462 const PointerType *RPT = rType->getAsPointerType(); 2463 bool LPtrToVoid = LPT ? 2464 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 2465 bool RPtrToVoid = RPT ? 2466 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 2467 2468 if (!LPtrToVoid && !RPtrToVoid && 2469 !Context.typesAreCompatible(lType, rType)) { 2470 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2471 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2472 ImpCastExprToType(rex, lType); 2473 return ResultTy; 2474 } 2475 ImpCastExprToType(rex, lType); 2476 return ResultTy; 2477 } 2478 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2479 ImpCastExprToType(rex, lType); 2480 return ResultTy; 2481 } else { 2482 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2483 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 2484 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2485 ImpCastExprToType(rex, lType); 2486 return ResultTy; 2487 } 2488 } 2489 } 2490 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2491 rType->isIntegerType()) { 2492 if (!RHSIsNull) 2493 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2494 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2495 ImpCastExprToType(rex, lType); // promote the integer to pointer 2496 return ResultTy; 2497 } 2498 if (lType->isIntegerType() && 2499 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2500 if (!LHSIsNull) 2501 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2502 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2503 ImpCastExprToType(lex, rType); // promote the integer to pointer 2504 return ResultTy; 2505 } 2506 // Handle block pointers. 2507 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2508 if (!RHSIsNull) 2509 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2510 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2511 ImpCastExprToType(rex, lType); // promote the integer to pointer 2512 return ResultTy; 2513 } 2514 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2515 if (!LHSIsNull) 2516 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2517 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2518 ImpCastExprToType(lex, rType); // promote the integer to pointer 2519 return ResultTy; 2520 } 2521 return InvalidOperands(Loc, lex, rex); 2522} 2523 2524/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2525/// operates on extended vector types. Instead of producing an IntTy result, 2526/// like a scalar comparison, a vector comparison produces a vector of integer 2527/// types. 2528QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2529 SourceLocation Loc, 2530 bool isRelational) { 2531 // Check to make sure we're operating on vectors of the same type and width, 2532 // Allowing one side to be a scalar of element type. 2533 QualType vType = CheckVectorOperands(Loc, lex, rex); 2534 if (vType.isNull()) 2535 return vType; 2536 2537 QualType lType = lex->getType(); 2538 QualType rType = rex->getType(); 2539 2540 // For non-floating point types, check for self-comparisons of the form 2541 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2542 // often indicate logic errors in the program. 2543 if (!lType->isFloatingType()) { 2544 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2545 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2546 if (DRL->getDecl() == DRR->getDecl()) 2547 Diag(Loc, diag::warn_selfcomparison); 2548 } 2549 2550 // Check for comparisons of floating point operands using != and ==. 2551 if (!isRelational && lType->isFloatingType()) { 2552 assert (rType->isFloatingType()); 2553 CheckFloatComparison(Loc,lex,rex); 2554 } 2555 2556 // Return the type for the comparison, which is the same as vector type for 2557 // integer vectors, or an integer type of identical size and number of 2558 // elements for floating point vectors. 2559 if (lType->isIntegerType()) 2560 return lType; 2561 2562 const VectorType *VTy = lType->getAsVectorType(); 2563 2564 // FIXME: need to deal with non-32b int / non-64b long long 2565 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2566 if (TypeSize == 32) { 2567 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2568 } 2569 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2570 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2571} 2572 2573inline QualType Sema::CheckBitwiseOperands( 2574 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2575{ 2576 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2577 return CheckVectorOperands(Loc, lex, rex); 2578 2579 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2580 2581 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2582 return compType; 2583 return InvalidOperands(Loc, lex, rex); 2584} 2585 2586inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2587 Expr *&lex, Expr *&rex, SourceLocation Loc) 2588{ 2589 UsualUnaryConversions(lex); 2590 UsualUnaryConversions(rex); 2591 2592 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2593 return Context.IntTy; 2594 return InvalidOperands(Loc, lex, rex); 2595} 2596 2597/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 2598/// emit an error and return true. If so, return false. 2599static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 2600 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 2601 if (IsLV == Expr::MLV_Valid) 2602 return false; 2603 2604 unsigned Diag = 0; 2605 bool NeedType = false; 2606 switch (IsLV) { // C99 6.5.16p2 2607 default: assert(0 && "Unknown result from isModifiableLvalue!"); 2608 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 2609 case Expr::MLV_ArrayType: 2610 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 2611 NeedType = true; 2612 break; 2613 case Expr::MLV_NotObjectType: 2614 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 2615 NeedType = true; 2616 break; 2617 case Expr::MLV_LValueCast: 2618 Diag = diag::err_typecheck_lvalue_casts_not_supported; 2619 break; 2620 case Expr::MLV_InvalidExpression: 2621 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 2622 break; 2623 case Expr::MLV_IncompleteType: 2624 case Expr::MLV_IncompleteVoidType: 2625 Diag = diag::err_typecheck_incomplete_type_not_modifiable_lvalue; 2626 NeedType = true; 2627 break; 2628 case Expr::MLV_DuplicateVectorComponents: 2629 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 2630 break; 2631 case Expr::MLV_NotBlockQualified: 2632 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 2633 break; 2634 case Expr::MLV_ReadonlyProperty: 2635 Diag = diag::error_readonly_property_assignment; 2636 break; 2637 case Expr::MLV_NoSetterProperty: 2638 Diag = diag::error_nosetter_property_assignment; 2639 break; 2640 } 2641 2642 if (NeedType) 2643 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 2644 else 2645 S.Diag(Loc, Diag) << E->getSourceRange(); 2646 return true; 2647} 2648 2649 2650 2651// C99 6.5.16.1 2652QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 2653 SourceLocation Loc, 2654 QualType CompoundType) { 2655 // Verify that LHS is a modifiable lvalue, and emit error if not. 2656 if (CheckForModifiableLvalue(LHS, Loc, *this)) 2657 return QualType(); 2658 2659 QualType LHSType = LHS->getType(); 2660 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 2661 2662 AssignConvertType ConvTy; 2663 if (CompoundType.isNull()) { 2664 // Simple assignment "x = y". 2665 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 2666 2667 // If the RHS is a unary plus or minus, check to see if they = and + are 2668 // right next to each other. If so, the user may have typo'd "x =+ 4" 2669 // instead of "x += 4". 2670 Expr *RHSCheck = RHS; 2671 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2672 RHSCheck = ICE->getSubExpr(); 2673 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2674 if ((UO->getOpcode() == UnaryOperator::Plus || 2675 UO->getOpcode() == UnaryOperator::Minus) && 2676 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 2677 // Only if the two operators are exactly adjacent. 2678 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2679 Diag(Loc, diag::warn_not_compound_assign) 2680 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 2681 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 2682 } 2683 } else { 2684 // Compound assignment "x += y" 2685 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 2686 } 2687 2688 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 2689 RHS, "assigning")) 2690 return QualType(); 2691 2692 // C99 6.5.16p3: The type of an assignment expression is the type of the 2693 // left operand unless the left operand has qualified type, in which case 2694 // it is the unqualified version of the type of the left operand. 2695 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2696 // is converted to the type of the assignment expression (above). 2697 // C++ 5.17p1: the type of the assignment expression is that of its left 2698 // oprdu. 2699 return LHSType.getUnqualifiedType(); 2700} 2701 2702// C99 6.5.17 2703QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 2704 // FIXME: what is required for LHS? 2705 2706 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2707 DefaultFunctionArrayConversion(RHS); 2708 return RHS->getType(); 2709} 2710 2711/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2712/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2713QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc) { 2714 QualType ResType = Op->getType(); 2715 assert(!ResType.isNull() && "no type for increment/decrement expression"); 2716 2717 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2718 if (ResType->isRealType()) { 2719 // OK! 2720 } else if (const PointerType *PT = ResType->getAsPointerType()) { 2721 // C99 6.5.2.4p2, 6.5.6p2 2722 if (PT->getPointeeType()->isObjectType()) { 2723 // Pointer to object is ok! 2724 } else if (PT->getPointeeType()->isVoidType()) { 2725 // Pointer to void is extension. 2726 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 2727 } else { 2728 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type) 2729 << ResType << Op->getSourceRange(); 2730 return QualType(); 2731 } 2732 } else if (ResType->isComplexType()) { 2733 // C99 does not support ++/-- on complex types, we allow as an extension. 2734 Diag(OpLoc, diag::ext_integer_increment_complex) 2735 << ResType << Op->getSourceRange(); 2736 } else { 2737 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 2738 << ResType << Op->getSourceRange(); 2739 return QualType(); 2740 } 2741 // At this point, we know we have a real, complex or pointer type. 2742 // Now make sure the operand is a modifiable lvalue. 2743 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 2744 return QualType(); 2745 return ResType; 2746} 2747 2748/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2749/// This routine allows us to typecheck complex/recursive expressions 2750/// where the declaration is needed for type checking. We only need to 2751/// handle cases when the expression references a function designator 2752/// or is an lvalue. Here are some examples: 2753/// - &(x) => x 2754/// - &*****f => f for f a function designator. 2755/// - &s.xx => s 2756/// - &s.zz[1].yy -> s, if zz is an array 2757/// - *(x + 1) -> x, if x is an array 2758/// - &"123"[2] -> 0 2759/// - & __real__ x -> x 2760static NamedDecl *getPrimaryDecl(Expr *E) { 2761 switch (E->getStmtClass()) { 2762 case Stmt::DeclRefExprClass: 2763 return cast<DeclRefExpr>(E)->getDecl(); 2764 case Stmt::MemberExprClass: 2765 // Fields cannot be declared with a 'register' storage class. 2766 // &X->f is always ok, even if X is declared register. 2767 if (cast<MemberExpr>(E)->isArrow()) 2768 return 0; 2769 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2770 case Stmt::ArraySubscriptExprClass: { 2771 // &X[4] and &4[X] refers to X if X is not a pointer. 2772 2773 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2774 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 2775 if (!VD || VD->getType()->isPointerType()) 2776 return 0; 2777 else 2778 return VD; 2779 } 2780 case Stmt::UnaryOperatorClass: { 2781 UnaryOperator *UO = cast<UnaryOperator>(E); 2782 2783 switch(UO->getOpcode()) { 2784 case UnaryOperator::Deref: { 2785 // *(X + 1) refers to X if X is not a pointer. 2786 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 2787 ValueDecl *VD = dyn_cast<ValueDecl>(D); 2788 if (!VD || VD->getType()->isPointerType()) 2789 return 0; 2790 return VD; 2791 } 2792 return 0; 2793 } 2794 case UnaryOperator::Real: 2795 case UnaryOperator::Imag: 2796 case UnaryOperator::Extension: 2797 return getPrimaryDecl(UO->getSubExpr()); 2798 default: 2799 return 0; 2800 } 2801 } 2802 case Stmt::BinaryOperatorClass: { 2803 BinaryOperator *BO = cast<BinaryOperator>(E); 2804 2805 // Handle cases involving pointer arithmetic. The result of an 2806 // Assign or AddAssign is not an lvalue so they can be ignored. 2807 2808 // (x + n) or (n + x) => x 2809 if (BO->getOpcode() == BinaryOperator::Add) { 2810 if (BO->getLHS()->getType()->isPointerType()) { 2811 return getPrimaryDecl(BO->getLHS()); 2812 } else if (BO->getRHS()->getType()->isPointerType()) { 2813 return getPrimaryDecl(BO->getRHS()); 2814 } 2815 } 2816 2817 return 0; 2818 } 2819 case Stmt::ParenExprClass: 2820 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2821 case Stmt::ImplicitCastExprClass: 2822 // &X[4] when X is an array, has an implicit cast from array to pointer. 2823 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2824 default: 2825 return 0; 2826 } 2827} 2828 2829/// CheckAddressOfOperand - The operand of & must be either a function 2830/// designator or an lvalue designating an object. If it is an lvalue, the 2831/// object cannot be declared with storage class register or be a bit field. 2832/// Note: The usual conversions are *not* applied to the operand of the & 2833/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2834/// In C++, the operand might be an overloaded function name, in which case 2835/// we allow the '&' but retain the overloaded-function type. 2836QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2837 if (getLangOptions().C99) { 2838 // Implement C99-only parts of addressof rules. 2839 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2840 if (uOp->getOpcode() == UnaryOperator::Deref) 2841 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2842 // (assuming the deref expression is valid). 2843 return uOp->getSubExpr()->getType(); 2844 } 2845 // Technically, there should be a check for array subscript 2846 // expressions here, but the result of one is always an lvalue anyway. 2847 } 2848 NamedDecl *dcl = getPrimaryDecl(op); 2849 Expr::isLvalueResult lval = op->isLvalue(Context); 2850 2851 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2852 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2853 // FIXME: emit more specific diag... 2854 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 2855 << op->getSourceRange(); 2856 return QualType(); 2857 } 2858 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2859 if (MemExpr->getMemberDecl()->isBitField()) { 2860 Diag(OpLoc, diag::err_typecheck_address_of) 2861 << "bit-field" << op->getSourceRange(); 2862 return QualType(); 2863 } 2864 // Check for Apple extension for accessing vector components. 2865 } else if (isa<ArraySubscriptExpr>(op) && 2866 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2867 Diag(OpLoc, diag::err_typecheck_address_of) 2868 << "vector" << op->getSourceRange(); 2869 return QualType(); 2870 } else if (dcl) { // C99 6.5.3.2p1 2871 // We have an lvalue with a decl. Make sure the decl is not declared 2872 // with the register storage-class specifier. 2873 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2874 if (vd->getStorageClass() == VarDecl::Register) { 2875 Diag(OpLoc, diag::err_typecheck_address_of) 2876 << "register variable" << op->getSourceRange(); 2877 return QualType(); 2878 } 2879 } else if (isa<OverloadedFunctionDecl>(dcl)) { 2880 return Context.OverloadTy; 2881 } else if (isa<FieldDecl>(dcl)) { 2882 // Okay: we can take the address of a field. 2883 } 2884 else 2885 assert(0 && "Unknown/unexpected decl type"); 2886 } 2887 2888 // If the operand has type "type", the result has type "pointer to type". 2889 return Context.getPointerType(op->getType()); 2890} 2891 2892QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 2893 UsualUnaryConversions(Op); 2894 QualType Ty = Op->getType(); 2895 2896 // Note that per both C89 and C99, this is always legal, even if ptype is an 2897 // incomplete type or void. It would be possible to warn about dereferencing 2898 // a void pointer, but it's completely well-defined, and such a warning is 2899 // unlikely to catch any mistakes. 2900 if (const PointerType *PT = Ty->getAsPointerType()) 2901 return PT->getPointeeType(); 2902 2903 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 2904 << Ty << Op->getSourceRange(); 2905 return QualType(); 2906} 2907 2908static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2909 tok::TokenKind Kind) { 2910 BinaryOperator::Opcode Opc; 2911 switch (Kind) { 2912 default: assert(0 && "Unknown binop!"); 2913 case tok::star: Opc = BinaryOperator::Mul; break; 2914 case tok::slash: Opc = BinaryOperator::Div; break; 2915 case tok::percent: Opc = BinaryOperator::Rem; break; 2916 case tok::plus: Opc = BinaryOperator::Add; break; 2917 case tok::minus: Opc = BinaryOperator::Sub; break; 2918 case tok::lessless: Opc = BinaryOperator::Shl; break; 2919 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2920 case tok::lessequal: Opc = BinaryOperator::LE; break; 2921 case tok::less: Opc = BinaryOperator::LT; break; 2922 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2923 case tok::greater: Opc = BinaryOperator::GT; break; 2924 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2925 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2926 case tok::amp: Opc = BinaryOperator::And; break; 2927 case tok::caret: Opc = BinaryOperator::Xor; break; 2928 case tok::pipe: Opc = BinaryOperator::Or; break; 2929 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2930 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2931 case tok::equal: Opc = BinaryOperator::Assign; break; 2932 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2933 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2934 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2935 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2936 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2937 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2938 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2939 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2940 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2941 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2942 case tok::comma: Opc = BinaryOperator::Comma; break; 2943 } 2944 return Opc; 2945} 2946 2947static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2948 tok::TokenKind Kind) { 2949 UnaryOperator::Opcode Opc; 2950 switch (Kind) { 2951 default: assert(0 && "Unknown unary op!"); 2952 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2953 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2954 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2955 case tok::star: Opc = UnaryOperator::Deref; break; 2956 case tok::plus: Opc = UnaryOperator::Plus; break; 2957 case tok::minus: Opc = UnaryOperator::Minus; break; 2958 case tok::tilde: Opc = UnaryOperator::Not; break; 2959 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2960 case tok::kw___real: Opc = UnaryOperator::Real; break; 2961 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2962 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2963 } 2964 return Opc; 2965} 2966 2967/// CreateBuiltinBinOp - Creates a new built-in binary operation with 2968/// operator @p Opc at location @c TokLoc. This routine only supports 2969/// built-in operations; ActOnBinOp handles overloaded operators. 2970Action::ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 2971 unsigned Op, 2972 Expr *lhs, Expr *rhs) { 2973 QualType ResultTy; // Result type of the binary operator. 2974 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2975 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 2976 2977 switch (Opc) { 2978 default: 2979 assert(0 && "Unknown binary expr!"); 2980 case BinaryOperator::Assign: 2981 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 2982 break; 2983 case BinaryOperator::Mul: 2984 case BinaryOperator::Div: 2985 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 2986 break; 2987 case BinaryOperator::Rem: 2988 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 2989 break; 2990 case BinaryOperator::Add: 2991 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 2992 break; 2993 case BinaryOperator::Sub: 2994 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 2995 break; 2996 case BinaryOperator::Shl: 2997 case BinaryOperator::Shr: 2998 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 2999 break; 3000 case BinaryOperator::LE: 3001 case BinaryOperator::LT: 3002 case BinaryOperator::GE: 3003 case BinaryOperator::GT: 3004 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 3005 break; 3006 case BinaryOperator::EQ: 3007 case BinaryOperator::NE: 3008 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 3009 break; 3010 case BinaryOperator::And: 3011 case BinaryOperator::Xor: 3012 case BinaryOperator::Or: 3013 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 3014 break; 3015 case BinaryOperator::LAnd: 3016 case BinaryOperator::LOr: 3017 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 3018 break; 3019 case BinaryOperator::MulAssign: 3020 case BinaryOperator::DivAssign: 3021 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 3022 if (!CompTy.isNull()) 3023 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3024 break; 3025 case BinaryOperator::RemAssign: 3026 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 3027 if (!CompTy.isNull()) 3028 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3029 break; 3030 case BinaryOperator::AddAssign: 3031 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 3032 if (!CompTy.isNull()) 3033 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3034 break; 3035 case BinaryOperator::SubAssign: 3036 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 3037 if (!CompTy.isNull()) 3038 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3039 break; 3040 case BinaryOperator::ShlAssign: 3041 case BinaryOperator::ShrAssign: 3042 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 3043 if (!CompTy.isNull()) 3044 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3045 break; 3046 case BinaryOperator::AndAssign: 3047 case BinaryOperator::XorAssign: 3048 case BinaryOperator::OrAssign: 3049 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 3050 if (!CompTy.isNull()) 3051 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3052 break; 3053 case BinaryOperator::Comma: 3054 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 3055 break; 3056 } 3057 if (ResultTy.isNull()) 3058 return true; 3059 if (CompTy.isNull()) 3060 return new BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc); 3061 else 3062 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, OpLoc); 3063} 3064 3065// Binary Operators. 'Tok' is the token for the operator. 3066Action::ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 3067 tok::TokenKind Kind, 3068 ExprTy *LHS, ExprTy *RHS) { 3069 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 3070 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 3071 3072 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 3073 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 3074 3075 // If either expression is type-dependent, just build the AST. 3076 // FIXME: We'll need to perform some caching of the result of name 3077 // lookup for operator+. 3078 if (lhs->isTypeDependent() || rhs->isTypeDependent()) { 3079 if (Opc > BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) 3080 return new CompoundAssignOperator(lhs, rhs, Opc, Context.DependentTy, 3081 Context.DependentTy, TokLoc); 3082 else 3083 return new BinaryOperator(lhs, rhs, Opc, Context.DependentTy, TokLoc); 3084 } 3085 3086 if (getLangOptions().CPlusPlus && 3087 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 3088 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 3089 // If this is one of the assignment operators, we only perform 3090 // overload resolution if the left-hand side is a class or 3091 // enumeration type (C++ [expr.ass]p3). 3092 if (Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign && 3093 !(lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType())) { 3094 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3095 } 3096 3097 // Determine which overloaded operator we're dealing with. 3098 static const OverloadedOperatorKind OverOps[] = { 3099 OO_Star, OO_Slash, OO_Percent, 3100 OO_Plus, OO_Minus, 3101 OO_LessLess, OO_GreaterGreater, 3102 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 3103 OO_EqualEqual, OO_ExclaimEqual, 3104 OO_Amp, 3105 OO_Caret, 3106 OO_Pipe, 3107 OO_AmpAmp, 3108 OO_PipePipe, 3109 OO_Equal, OO_StarEqual, 3110 OO_SlashEqual, OO_PercentEqual, 3111 OO_PlusEqual, OO_MinusEqual, 3112 OO_LessLessEqual, OO_GreaterGreaterEqual, 3113 OO_AmpEqual, OO_CaretEqual, 3114 OO_PipeEqual, 3115 OO_Comma 3116 }; 3117 OverloadedOperatorKind OverOp = OverOps[Opc]; 3118 3119 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3120 // to the candidate set. 3121 OverloadCandidateSet CandidateSet; 3122 Expr *Args[2] = { lhs, rhs }; 3123 AddOperatorCandidates(OverOp, S, Args, 2, CandidateSet); 3124 3125 // Perform overload resolution. 3126 OverloadCandidateSet::iterator Best; 3127 switch (BestViableFunction(CandidateSet, Best)) { 3128 case OR_Success: { 3129 // We found a built-in operator or an overloaded operator. 3130 FunctionDecl *FnDecl = Best->Function; 3131 3132 if (FnDecl) { 3133 // We matched an overloaded operator. Build a call to that 3134 // operator. 3135 3136 // Convert the arguments. 3137 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3138 if (PerformObjectArgumentInitialization(lhs, Method) || 3139 PerformCopyInitialization(rhs, FnDecl->getParamDecl(0)->getType(), 3140 "passing")) 3141 return true; 3142 } else { 3143 // Convert the arguments. 3144 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 3145 "passing") || 3146 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 3147 "passing")) 3148 return true; 3149 } 3150 3151 // Determine the result type 3152 QualType ResultTy 3153 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3154 ResultTy = ResultTy.getNonReferenceType(); 3155 3156 // Build the actual expression node. 3157 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 3158 SourceLocation()); 3159 UsualUnaryConversions(FnExpr); 3160 3161 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, TokLoc); 3162 } else { 3163 // We matched a built-in operator. Convert the arguments, then 3164 // break out so that we will build the appropriate built-in 3165 // operator node. 3166 if (PerformCopyInitialization(lhs, Best->BuiltinTypes.ParamTypes[0], 3167 "passing") || 3168 PerformCopyInitialization(rhs, Best->BuiltinTypes.ParamTypes[1], 3169 "passing")) 3170 return true; 3171 3172 break; 3173 } 3174 } 3175 3176 case OR_No_Viable_Function: 3177 // No viable function; fall through to handling this as a 3178 // built-in operator, which will produce an error message for us. 3179 break; 3180 3181 case OR_Ambiguous: 3182 Diag(TokLoc, diag::err_ovl_ambiguous_oper) 3183 << BinaryOperator::getOpcodeStr(Opc) 3184 << lhs->getSourceRange() << rhs->getSourceRange(); 3185 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3186 return true; 3187 } 3188 3189 // Either we found no viable overloaded operator or we matched a 3190 // built-in operator. In either case, fall through to trying to 3191 // build a built-in operation. 3192 } 3193 3194 // Build a built-in binary operation. 3195 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3196} 3197 3198// Unary Operators. 'Tok' is the token for the operator. 3199Action::ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 3200 tok::TokenKind Op, ExprTy *input) { 3201 Expr *Input = (Expr*)input; 3202 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 3203 3204 if (getLangOptions().CPlusPlus && 3205 (Input->getType()->isRecordType() 3206 || Input->getType()->isEnumeralType())) { 3207 // Determine which overloaded operator we're dealing with. 3208 static const OverloadedOperatorKind OverOps[] = { 3209 OO_None, OO_None, 3210 OO_PlusPlus, OO_MinusMinus, 3211 OO_Amp, OO_Star, 3212 OO_Plus, OO_Minus, 3213 OO_Tilde, OO_Exclaim, 3214 OO_None, OO_None, 3215 OO_None, 3216 OO_None 3217 }; 3218 OverloadedOperatorKind OverOp = OverOps[Opc]; 3219 3220 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3221 // to the candidate set. 3222 OverloadCandidateSet CandidateSet; 3223 if (OverOp != OO_None) 3224 AddOperatorCandidates(OverOp, S, &Input, 1, CandidateSet); 3225 3226 // Perform overload resolution. 3227 OverloadCandidateSet::iterator Best; 3228 switch (BestViableFunction(CandidateSet, Best)) { 3229 case OR_Success: { 3230 // We found a built-in operator or an overloaded operator. 3231 FunctionDecl *FnDecl = Best->Function; 3232 3233 if (FnDecl) { 3234 // We matched an overloaded operator. Build a call to that 3235 // operator. 3236 3237 // Convert the arguments. 3238 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3239 if (PerformObjectArgumentInitialization(Input, Method)) 3240 return true; 3241 } else { 3242 // Convert the arguments. 3243 if (PerformCopyInitialization(Input, 3244 FnDecl->getParamDecl(0)->getType(), 3245 "passing")) 3246 return true; 3247 } 3248 3249 // Determine the result type 3250 QualType ResultTy 3251 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3252 ResultTy = ResultTy.getNonReferenceType(); 3253 3254 // Build the actual expression node. 3255 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 3256 SourceLocation()); 3257 UsualUnaryConversions(FnExpr); 3258 3259 return new CXXOperatorCallExpr(FnExpr, &Input, 1, ResultTy, OpLoc); 3260 } else { 3261 // We matched a built-in operator. Convert the arguments, then 3262 // break out so that we will build the appropriate built-in 3263 // operator node. 3264 if (PerformCopyInitialization(Input, Best->BuiltinTypes.ParamTypes[0], 3265 "passing")) 3266 return true; 3267 3268 break; 3269 } 3270 } 3271 3272 case OR_No_Viable_Function: 3273 // No viable function; fall through to handling this as a 3274 // built-in operator, which will produce an error message for us. 3275 break; 3276 3277 case OR_Ambiguous: 3278 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 3279 << UnaryOperator::getOpcodeStr(Opc) 3280 << Input->getSourceRange(); 3281 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3282 return true; 3283 } 3284 3285 // Either we found no viable overloaded operator or we matched a 3286 // built-in operator. In either case, fall through to trying to 3287 // build a built-in operation. 3288 } 3289 3290 QualType resultType; 3291 switch (Opc) { 3292 default: 3293 assert(0 && "Unimplemented unary expr!"); 3294 case UnaryOperator::PreInc: 3295 case UnaryOperator::PreDec: 3296 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 3297 break; 3298 case UnaryOperator::AddrOf: 3299 resultType = CheckAddressOfOperand(Input, OpLoc); 3300 break; 3301 case UnaryOperator::Deref: 3302 DefaultFunctionArrayConversion(Input); 3303 resultType = CheckIndirectionOperand(Input, OpLoc); 3304 break; 3305 case UnaryOperator::Plus: 3306 case UnaryOperator::Minus: 3307 UsualUnaryConversions(Input); 3308 resultType = Input->getType(); 3309 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 3310 break; 3311 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 3312 resultType->isEnumeralType()) 3313 break; 3314 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 3315 Opc == UnaryOperator::Plus && 3316 resultType->isPointerType()) 3317 break; 3318 3319 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3320 << resultType << Input->getSourceRange(); 3321 case UnaryOperator::Not: // bitwise complement 3322 UsualUnaryConversions(Input); 3323 resultType = Input->getType(); 3324 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 3325 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 3326 // C99 does not support '~' for complex conjugation. 3327 Diag(OpLoc, diag::ext_integer_complement_complex) 3328 << resultType << Input->getSourceRange(); 3329 else if (!resultType->isIntegerType()) 3330 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3331 << resultType << Input->getSourceRange(); 3332 break; 3333 case UnaryOperator::LNot: // logical negation 3334 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 3335 DefaultFunctionArrayConversion(Input); 3336 resultType = Input->getType(); 3337 if (!resultType->isScalarType()) // C99 6.5.3.3p1 3338 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3339 << resultType << Input->getSourceRange(); 3340 // LNot always has type int. C99 6.5.3.3p5. 3341 resultType = Context.IntTy; 3342 break; 3343 case UnaryOperator::Real: 3344 case UnaryOperator::Imag: 3345 resultType = CheckRealImagOperand(Input, OpLoc); 3346 break; 3347 case UnaryOperator::Extension: 3348 resultType = Input->getType(); 3349 break; 3350 } 3351 if (resultType.isNull()) 3352 return true; 3353 return new UnaryOperator(Input, Opc, resultType, OpLoc); 3354} 3355 3356/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 3357Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 3358 SourceLocation LabLoc, 3359 IdentifierInfo *LabelII) { 3360 // Look up the record for this label identifier. 3361 LabelStmt *&LabelDecl = LabelMap[LabelII]; 3362 3363 // If we haven't seen this label yet, create a forward reference. It 3364 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 3365 if (LabelDecl == 0) 3366 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 3367 3368 // Create the AST node. The address of a label always has type 'void*'. 3369 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 3370 Context.getPointerType(Context.VoidTy)); 3371} 3372 3373Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 3374 SourceLocation RPLoc) { // "({..})" 3375 Stmt *SubStmt = static_cast<Stmt*>(substmt); 3376 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 3377 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 3378 3379 // FIXME: there are a variety of strange constraints to enforce here, for 3380 // example, it is not possible to goto into a stmt expression apparently. 3381 // More semantic analysis is needed. 3382 3383 // FIXME: the last statement in the compount stmt has its value used. We 3384 // should not warn about it being unused. 3385 3386 // If there are sub stmts in the compound stmt, take the type of the last one 3387 // as the type of the stmtexpr. 3388 QualType Ty = Context.VoidTy; 3389 3390 if (!Compound->body_empty()) { 3391 Stmt *LastStmt = Compound->body_back(); 3392 // If LastStmt is a label, skip down through into the body. 3393 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 3394 LastStmt = Label->getSubStmt(); 3395 3396 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 3397 Ty = LastExpr->getType(); 3398 } 3399 3400 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 3401} 3402 3403Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 3404 SourceLocation TypeLoc, 3405 TypeTy *argty, 3406 OffsetOfComponent *CompPtr, 3407 unsigned NumComponents, 3408 SourceLocation RPLoc) { 3409 QualType ArgTy = QualType::getFromOpaquePtr(argty); 3410 assert(!ArgTy.isNull() && "Missing type argument!"); 3411 3412 // We must have at least one component that refers to the type, and the first 3413 // one is known to be a field designator. Verify that the ArgTy represents 3414 // a struct/union/class. 3415 if (!ArgTy->isRecordType()) 3416 return Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy; 3417 3418 // Otherwise, create a compound literal expression as the base, and 3419 // iteratively process the offsetof designators. 3420 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 3421 3422 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 3423 // GCC extension, diagnose them. 3424 if (NumComponents != 1) 3425 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 3426 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 3427 3428 for (unsigned i = 0; i != NumComponents; ++i) { 3429 const OffsetOfComponent &OC = CompPtr[i]; 3430 if (OC.isBrackets) { 3431 // Offset of an array sub-field. TODO: Should we allow vector elements? 3432 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 3433 if (!AT) { 3434 delete Res; 3435 return Diag(OC.LocEnd, diag::err_offsetof_array_type) << Res->getType(); 3436 } 3437 3438 // FIXME: C++: Verify that operator[] isn't overloaded. 3439 3440 // C99 6.5.2.1p1 3441 Expr *Idx = static_cast<Expr*>(OC.U.E); 3442 if (!Idx->getType()->isIntegerType()) 3443 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript) 3444 << Idx->getSourceRange(); 3445 3446 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 3447 continue; 3448 } 3449 3450 const RecordType *RC = Res->getType()->getAsRecordType(); 3451 if (!RC) { 3452 delete Res; 3453 return Diag(OC.LocEnd, diag::err_offsetof_record_type) << Res->getType(); 3454 } 3455 3456 // Get the decl corresponding to this. 3457 RecordDecl *RD = RC->getDecl(); 3458 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 3459 if (!MemberDecl) 3460 return Diag(BuiltinLoc, diag::err_typecheck_no_member) 3461 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd); 3462 3463 // FIXME: C++: Verify that MemberDecl isn't a static field. 3464 // FIXME: Verify that MemberDecl isn't a bitfield. 3465 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 3466 // matter here. 3467 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, 3468 MemberDecl->getType().getNonReferenceType()); 3469 } 3470 3471 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 3472 BuiltinLoc); 3473} 3474 3475 3476Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 3477 TypeTy *arg1, TypeTy *arg2, 3478 SourceLocation RPLoc) { 3479 QualType argT1 = QualType::getFromOpaquePtr(arg1); 3480 QualType argT2 = QualType::getFromOpaquePtr(arg2); 3481 3482 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 3483 3484 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 3485} 3486 3487Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 3488 ExprTy *expr1, ExprTy *expr2, 3489 SourceLocation RPLoc) { 3490 Expr *CondExpr = static_cast<Expr*>(cond); 3491 Expr *LHSExpr = static_cast<Expr*>(expr1); 3492 Expr *RHSExpr = static_cast<Expr*>(expr2); 3493 3494 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 3495 3496 // The conditional expression is required to be a constant expression. 3497 llvm::APSInt condEval(32); 3498 SourceLocation ExpLoc; 3499 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 3500 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant) 3501 << CondExpr->getSourceRange(); 3502 3503 // If the condition is > zero, then the AST type is the same as the LSHExpr. 3504 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 3505 RHSExpr->getType(); 3506 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 3507} 3508 3509//===----------------------------------------------------------------------===// 3510// Clang Extensions. 3511//===----------------------------------------------------------------------===// 3512 3513/// ActOnBlockStart - This callback is invoked when a block literal is started. 3514void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 3515 // Analyze block parameters. 3516 BlockSemaInfo *BSI = new BlockSemaInfo(); 3517 3518 // Add BSI to CurBlock. 3519 BSI->PrevBlockInfo = CurBlock; 3520 CurBlock = BSI; 3521 3522 BSI->ReturnType = 0; 3523 BSI->TheScope = BlockScope; 3524 3525 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 3526 PushDeclContext(BSI->TheDecl); 3527} 3528 3529void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 3530 // Analyze arguments to block. 3531 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 3532 "Not a function declarator!"); 3533 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 3534 3535 CurBlock->hasPrototype = FTI.hasPrototype; 3536 CurBlock->isVariadic = true; 3537 3538 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 3539 // no arguments, not a function that takes a single void argument. 3540 if (FTI.hasPrototype && 3541 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3542 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 3543 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 3544 // empty arg list, don't push any params. 3545 CurBlock->isVariadic = false; 3546 } else if (FTI.hasPrototype) { 3547 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 3548 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 3549 CurBlock->isVariadic = FTI.isVariadic; 3550 } 3551 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 3552 3553 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 3554 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 3555 // If this has an identifier, add it to the scope stack. 3556 if ((*AI)->getIdentifier()) 3557 PushOnScopeChains(*AI, CurBlock->TheScope); 3558} 3559 3560/// ActOnBlockError - If there is an error parsing a block, this callback 3561/// is invoked to pop the information about the block from the action impl. 3562void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 3563 // Ensure that CurBlock is deleted. 3564 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 3565 3566 // Pop off CurBlock, handle nested blocks. 3567 CurBlock = CurBlock->PrevBlockInfo; 3568 3569 // FIXME: Delete the ParmVarDecl objects as well??? 3570 3571} 3572 3573/// ActOnBlockStmtExpr - This is called when the body of a block statement 3574/// literal was successfully completed. ^(int x){...} 3575Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 3576 Scope *CurScope) { 3577 // Ensure that CurBlock is deleted. 3578 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 3579 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 3580 3581 PopDeclContext(); 3582 3583 // Pop off CurBlock, handle nested blocks. 3584 CurBlock = CurBlock->PrevBlockInfo; 3585 3586 QualType RetTy = Context.VoidTy; 3587 if (BSI->ReturnType) 3588 RetTy = QualType(BSI->ReturnType, 0); 3589 3590 llvm::SmallVector<QualType, 8> ArgTypes; 3591 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 3592 ArgTypes.push_back(BSI->Params[i]->getType()); 3593 3594 QualType BlockTy; 3595 if (!BSI->hasPrototype) 3596 BlockTy = Context.getFunctionTypeNoProto(RetTy); 3597 else 3598 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 3599 BSI->isVariadic, 0); 3600 3601 BlockTy = Context.getBlockPointerType(BlockTy); 3602 3603 BSI->TheDecl->setBody(Body.take()); 3604 return new BlockExpr(BSI->TheDecl, BlockTy); 3605} 3606 3607/// ExprsMatchFnType - return true if the Exprs in array Args have 3608/// QualTypes that match the QualTypes of the arguments of the FnType. 3609/// The number of arguments has already been validated to match the number of 3610/// arguments in FnType. 3611static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 3612 ASTContext &Context) { 3613 unsigned NumParams = FnType->getNumArgs(); 3614 for (unsigned i = 0; i != NumParams; ++i) { 3615 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 3616 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 3617 3618 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 3619 return false; 3620 } 3621 return true; 3622} 3623 3624Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 3625 SourceLocation *CommaLocs, 3626 SourceLocation BuiltinLoc, 3627 SourceLocation RParenLoc) { 3628 // __builtin_overload requires at least 2 arguments 3629 if (NumArgs < 2) 3630 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 3631 << SourceRange(BuiltinLoc, RParenLoc); 3632 3633 // The first argument is required to be a constant expression. It tells us 3634 // the number of arguments to pass to each of the functions to be overloaded. 3635 Expr **Args = reinterpret_cast<Expr**>(args); 3636 Expr *NParamsExpr = Args[0]; 3637 llvm::APSInt constEval(32); 3638 SourceLocation ExpLoc; 3639 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 3640 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 3641 << NParamsExpr->getSourceRange(); 3642 3643 // Verify that the number of parameters is > 0 3644 unsigned NumParams = constEval.getZExtValue(); 3645 if (NumParams == 0) 3646 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 3647 << NParamsExpr->getSourceRange(); 3648 // Verify that we have at least 1 + NumParams arguments to the builtin. 3649 if ((NumParams + 1) > NumArgs) 3650 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 3651 << SourceRange(BuiltinLoc, RParenLoc); 3652 3653 // Figure out the return type, by matching the args to one of the functions 3654 // listed after the parameters. 3655 OverloadExpr *OE = 0; 3656 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 3657 // UsualUnaryConversions will convert the function DeclRefExpr into a 3658 // pointer to function. 3659 Expr *Fn = UsualUnaryConversions(Args[i]); 3660 const FunctionTypeProto *FnType = 0; 3661 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3662 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3663 3664 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3665 // parameters, and the number of parameters must match the value passed to 3666 // the builtin. 3667 if (!FnType || (FnType->getNumArgs() != NumParams)) 3668 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype) 3669 << Fn->getSourceRange(); 3670 3671 // Scan the parameter list for the FunctionType, checking the QualType of 3672 // each parameter against the QualTypes of the arguments to the builtin. 3673 // If they match, return a new OverloadExpr. 3674 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3675 if (OE) 3676 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match) 3677 << OE->getFn()->getSourceRange(); 3678 // Remember our match, and continue processing the remaining arguments 3679 // to catch any errors. 3680 OE = new OverloadExpr(Args, NumArgs, i, 3681 FnType->getResultType().getNonReferenceType(), 3682 BuiltinLoc, RParenLoc); 3683 } 3684 } 3685 // Return the newly created OverloadExpr node, if we succeded in matching 3686 // exactly one of the candidate functions. 3687 if (OE) 3688 return OE; 3689 3690 // If we didn't find a matching function Expr in the __builtin_overload list 3691 // the return an error. 3692 std::string typeNames; 3693 for (unsigned i = 0; i != NumParams; ++i) { 3694 if (i != 0) typeNames += ", "; 3695 typeNames += Args[i+1]->getType().getAsString(); 3696 } 3697 3698 return Diag(BuiltinLoc, diag::err_overload_no_match) 3699 << typeNames << SourceRange(BuiltinLoc, RParenLoc); 3700} 3701 3702Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3703 ExprTy *expr, TypeTy *type, 3704 SourceLocation RPLoc) { 3705 Expr *E = static_cast<Expr*>(expr); 3706 QualType T = QualType::getFromOpaquePtr(type); 3707 3708 InitBuiltinVaListType(); 3709 3710 // Get the va_list type 3711 QualType VaListType = Context.getBuiltinVaListType(); 3712 // Deal with implicit array decay; for example, on x86-64, 3713 // va_list is an array, but it's supposed to decay to 3714 // a pointer for va_arg. 3715 if (VaListType->isArrayType()) 3716 VaListType = Context.getArrayDecayedType(VaListType); 3717 // Make sure the input expression also decays appropriately. 3718 UsualUnaryConversions(E); 3719 3720 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3721 return Diag(E->getLocStart(), 3722 diag::err_first_argument_to_va_arg_not_of_type_va_list) 3723 << E->getType() << E->getSourceRange(); 3724 3725 // FIXME: Warn if a non-POD type is passed in. 3726 3727 return new VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 3728} 3729 3730Sema::ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 3731 // The type of __null will be int or long, depending on the size of 3732 // pointers on the target. 3733 QualType Ty; 3734 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 3735 Ty = Context.IntTy; 3736 else 3737 Ty = Context.LongTy; 3738 3739 return new GNUNullExpr(Ty, TokenLoc); 3740} 3741 3742bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3743 SourceLocation Loc, 3744 QualType DstType, QualType SrcType, 3745 Expr *SrcExpr, const char *Flavor) { 3746 // Decode the result (notice that AST's are still created for extensions). 3747 bool isInvalid = false; 3748 unsigned DiagKind; 3749 switch (ConvTy) { 3750 default: assert(0 && "Unknown conversion type"); 3751 case Compatible: return false; 3752 case PointerToInt: 3753 DiagKind = diag::ext_typecheck_convert_pointer_int; 3754 break; 3755 case IntToPointer: 3756 DiagKind = diag::ext_typecheck_convert_int_pointer; 3757 break; 3758 case IncompatiblePointer: 3759 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3760 break; 3761 case FunctionVoidPointer: 3762 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3763 break; 3764 case CompatiblePointerDiscardsQualifiers: 3765 // If the qualifiers lost were because we were applying the 3766 // (deprecated) C++ conversion from a string literal to a char* 3767 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3768 // Ideally, this check would be performed in 3769 // CheckPointerTypesForAssignment. However, that would require a 3770 // bit of refactoring (so that the second argument is an 3771 // expression, rather than a type), which should be done as part 3772 // of a larger effort to fix CheckPointerTypesForAssignment for 3773 // C++ semantics. 3774 if (getLangOptions().CPlusPlus && 3775 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3776 return false; 3777 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3778 break; 3779 case IntToBlockPointer: 3780 DiagKind = diag::err_int_to_block_pointer; 3781 break; 3782 case IncompatibleBlockPointer: 3783 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3784 break; 3785 case IncompatibleObjCQualifiedId: 3786 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3787 // it can give a more specific diagnostic. 3788 DiagKind = diag::warn_incompatible_qualified_id; 3789 break; 3790 case Incompatible: 3791 DiagKind = diag::err_typecheck_convert_incompatible; 3792 isInvalid = true; 3793 break; 3794 } 3795 3796 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 3797 << SrcExpr->getSourceRange(); 3798 return isInvalid; 3799} 3800 3801bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 3802{ 3803 Expr::EvalResult EvalResult; 3804 3805 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 3806 EvalResult.HasSideEffects) { 3807 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 3808 3809 if (EvalResult.Diag) { 3810 // We only show the note if it's not the usual "invalid subexpression" 3811 // or if it's actually in a subexpression. 3812 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 3813 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 3814 Diag(EvalResult.DiagLoc, EvalResult.Diag); 3815 } 3816 3817 return true; 3818 } 3819 3820 if (EvalResult.Diag) { 3821 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 3822 E->getSourceRange(); 3823 3824 // Print the reason it's not a constant. 3825 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 3826 Diag(EvalResult.DiagLoc, EvalResult.Diag); 3827 } 3828 3829 if (Result) 3830 *Result = EvalResult.Val.getInt(); 3831 return false; 3832} 3833