SemaExpr.cpp revision cd19b57e8c03a742954680830bc440b8b0e08965
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/AST/DeclTemplate.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/LiteralSupport.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/// \brief Determine whether the use of this declaration is valid, and 30/// emit any corresponding diagnostics. 31/// 32/// This routine diagnoses various problems with referencing 33/// declarations that can occur when using a declaration. For example, 34/// it might warn if a deprecated or unavailable declaration is being 35/// used, or produce an error (and return true) if a C++0x deleted 36/// function is being used. 37/// 38/// \returns true if there was an error (this declaration cannot be 39/// referenced), false otherwise. 40bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 41 // See if the decl is deprecated. 42 if (D->getAttr<DeprecatedAttr>()) { 43 // Implementing deprecated stuff requires referencing deprecated 44 // stuff. Don't warn if we are implementing a deprecated 45 // construct. 46 bool isSilenced = false; 47 48 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 49 // If this reference happens *in* a deprecated function or method, don't 50 // warn. 51 isSilenced = ND->getAttr<DeprecatedAttr>(); 52 53 // If this is an Objective-C method implementation, check to see if the 54 // method was deprecated on the declaration, not the definition. 55 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 56 // The semantic decl context of a ObjCMethodDecl is the 57 // ObjCImplementationDecl. 58 if (ObjCImplementationDecl *Impl 59 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 60 61 MD = Impl->getClassInterface()->getMethod(Context, 62 MD->getSelector(), 63 MD->isInstanceMethod()); 64 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); 65 } 66 } 67 } 68 69 if (!isSilenced) 70 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 71 } 72 73 // See if this is a deleted function. 74 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 75 if (FD->isDeleted()) { 76 Diag(Loc, diag::err_deleted_function_use); 77 Diag(D->getLocation(), diag::note_unavailable_here) << true; 78 return true; 79 } 80 } 81 82 // See if the decl is unavailable 83 if (D->getAttr<UnavailableAttr>()) { 84 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 85 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 86 } 87 88 return false; 89} 90 91SourceRange Sema::getExprRange(ExprTy *E) const { 92 Expr *Ex = (Expr *)E; 93 return Ex? Ex->getSourceRange() : SourceRange(); 94} 95 96//===----------------------------------------------------------------------===// 97// Standard Promotions and Conversions 98//===----------------------------------------------------------------------===// 99 100/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 101void Sema::DefaultFunctionArrayConversion(Expr *&E) { 102 QualType Ty = E->getType(); 103 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 104 105 if (Ty->isFunctionType()) 106 ImpCastExprToType(E, Context.getPointerType(Ty)); 107 else if (Ty->isArrayType()) { 108 // In C90 mode, arrays only promote to pointers if the array expression is 109 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 110 // type 'array of type' is converted to an expression that has type 'pointer 111 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 112 // that has type 'array of type' ...". The relevant change is "an lvalue" 113 // (C90) to "an expression" (C99). 114 // 115 // C++ 4.2p1: 116 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 117 // T" can be converted to an rvalue of type "pointer to T". 118 // 119 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 120 E->isLvalue(Context) == Expr::LV_Valid) 121 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 122 } 123} 124 125/// UsualUnaryConversions - Performs various conversions that are common to most 126/// operators (C99 6.3). The conversions of array and function types are 127/// sometimes surpressed. For example, the array->pointer conversion doesn't 128/// apply if the array is an argument to the sizeof or address (&) operators. 129/// In these instances, this routine should *not* be called. 130Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 131 QualType Ty = Expr->getType(); 132 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 133 134 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 135 ImpCastExprToType(Expr, Context.IntTy); 136 else 137 DefaultFunctionArrayConversion(Expr); 138 139 return Expr; 140} 141 142/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 143/// do not have a prototype. Arguments that have type float are promoted to 144/// double. All other argument types are converted by UsualUnaryConversions(). 145void Sema::DefaultArgumentPromotion(Expr *&Expr) { 146 QualType Ty = Expr->getType(); 147 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 148 149 // If this is a 'float' (CVR qualified or typedef) promote to double. 150 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 151 if (BT->getKind() == BuiltinType::Float) 152 return ImpCastExprToType(Expr, Context.DoubleTy); 153 154 UsualUnaryConversions(Expr); 155} 156 157/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 158/// will warn if the resulting type is not a POD type, and rejects ObjC 159/// interfaces passed by value. This returns true if the argument type is 160/// completely illegal. 161bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 162 DefaultArgumentPromotion(Expr); 163 164 if (Expr->getType()->isObjCInterfaceType()) { 165 Diag(Expr->getLocStart(), 166 diag::err_cannot_pass_objc_interface_to_vararg) 167 << Expr->getType() << CT; 168 return true; 169 } 170 171 if (!Expr->getType()->isPODType()) 172 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 173 << Expr->getType() << CT; 174 175 return false; 176} 177 178 179/// UsualArithmeticConversions - Performs various conversions that are common to 180/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 181/// routine returns the first non-arithmetic type found. The client is 182/// responsible for emitting appropriate error diagnostics. 183/// FIXME: verify the conversion rules for "complex int" are consistent with 184/// GCC. 185QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 186 bool isCompAssign) { 187 if (!isCompAssign) 188 UsualUnaryConversions(lhsExpr); 189 190 UsualUnaryConversions(rhsExpr); 191 192 // For conversion purposes, we ignore any qualifiers. 193 // For example, "const float" and "float" are equivalent. 194 QualType lhs = 195 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 196 QualType rhs = 197 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 198 199 // If both types are identical, no conversion is needed. 200 if (lhs == rhs) 201 return lhs; 202 203 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 204 // The caller can deal with this (e.g. pointer + int). 205 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 206 return lhs; 207 208 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 209 if (!isCompAssign) 210 ImpCastExprToType(lhsExpr, destType); 211 ImpCastExprToType(rhsExpr, destType); 212 return destType; 213} 214 215QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 216 // Perform the usual unary conversions. We do this early so that 217 // integral promotions to "int" can allow us to exit early, in the 218 // lhs == rhs check. Also, for conversion purposes, we ignore any 219 // qualifiers. For example, "const float" and "float" are 220 // equivalent. 221 if (lhs->isPromotableIntegerType()) 222 lhs = Context.IntTy; 223 else 224 lhs = lhs.getUnqualifiedType(); 225 if (rhs->isPromotableIntegerType()) 226 rhs = Context.IntTy; 227 else 228 rhs = rhs.getUnqualifiedType(); 229 230 // If both types are identical, no conversion is needed. 231 if (lhs == rhs) 232 return lhs; 233 234 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 235 // The caller can deal with this (e.g. pointer + int). 236 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 237 return lhs; 238 239 // At this point, we have two different arithmetic types. 240 241 // Handle complex types first (C99 6.3.1.8p1). 242 if (lhs->isComplexType() || rhs->isComplexType()) { 243 // if we have an integer operand, the result is the complex type. 244 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 245 // convert the rhs to the lhs complex type. 246 return lhs; 247 } 248 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 249 // convert the lhs to the rhs complex type. 250 return rhs; 251 } 252 // This handles complex/complex, complex/float, or float/complex. 253 // When both operands are complex, the shorter operand is converted to the 254 // type of the longer, and that is the type of the result. This corresponds 255 // to what is done when combining two real floating-point operands. 256 // The fun begins when size promotion occur across type domains. 257 // From H&S 6.3.4: When one operand is complex and the other is a real 258 // floating-point type, the less precise type is converted, within it's 259 // real or complex domain, to the precision of the other type. For example, 260 // when combining a "long double" with a "double _Complex", the 261 // "double _Complex" is promoted to "long double _Complex". 262 int result = Context.getFloatingTypeOrder(lhs, rhs); 263 264 if (result > 0) { // The left side is bigger, convert rhs. 265 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 266 } else if (result < 0) { // The right side is bigger, convert lhs. 267 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 268 } 269 // At this point, lhs and rhs have the same rank/size. Now, make sure the 270 // domains match. This is a requirement for our implementation, C99 271 // does not require this promotion. 272 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 273 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 274 return rhs; 275 } else { // handle "_Complex double, double". 276 return lhs; 277 } 278 } 279 return lhs; // The domain/size match exactly. 280 } 281 // Now handle "real" floating types (i.e. float, double, long double). 282 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 283 // if we have an integer operand, the result is the real floating type. 284 if (rhs->isIntegerType()) { 285 // convert rhs to the lhs floating point type. 286 return lhs; 287 } 288 if (rhs->isComplexIntegerType()) { 289 // convert rhs to the complex floating point type. 290 return Context.getComplexType(lhs); 291 } 292 if (lhs->isIntegerType()) { 293 // convert lhs to the rhs floating point type. 294 return rhs; 295 } 296 if (lhs->isComplexIntegerType()) { 297 // convert lhs to the complex floating point type. 298 return Context.getComplexType(rhs); 299 } 300 // We have two real floating types, float/complex combos were handled above. 301 // Convert the smaller operand to the bigger result. 302 int result = Context.getFloatingTypeOrder(lhs, rhs); 303 if (result > 0) // convert the rhs 304 return lhs; 305 assert(result < 0 && "illegal float comparison"); 306 return rhs; // convert the lhs 307 } 308 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 309 // Handle GCC complex int extension. 310 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 311 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 312 313 if (lhsComplexInt && rhsComplexInt) { 314 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 315 rhsComplexInt->getElementType()) >= 0) 316 return lhs; // convert the rhs 317 return rhs; 318 } else if (lhsComplexInt && rhs->isIntegerType()) { 319 // convert the rhs to the lhs complex type. 320 return lhs; 321 } else if (rhsComplexInt && lhs->isIntegerType()) { 322 // convert the lhs to the rhs complex type. 323 return rhs; 324 } 325 } 326 // Finally, we have two differing integer types. 327 // The rules for this case are in C99 6.3.1.8 328 int compare = Context.getIntegerTypeOrder(lhs, rhs); 329 bool lhsSigned = lhs->isSignedIntegerType(), 330 rhsSigned = rhs->isSignedIntegerType(); 331 QualType destType; 332 if (lhsSigned == rhsSigned) { 333 // Same signedness; use the higher-ranked type 334 destType = compare >= 0 ? lhs : rhs; 335 } else if (compare != (lhsSigned ? 1 : -1)) { 336 // The unsigned type has greater than or equal rank to the 337 // signed type, so use the unsigned type 338 destType = lhsSigned ? rhs : lhs; 339 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 340 // The two types are different widths; if we are here, that 341 // means the signed type is larger than the unsigned type, so 342 // use the signed type. 343 destType = lhsSigned ? lhs : rhs; 344 } else { 345 // The signed type is higher-ranked than the unsigned type, 346 // but isn't actually any bigger (like unsigned int and long 347 // on most 32-bit systems). Use the unsigned type corresponding 348 // to the signed type. 349 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 350 } 351 return destType; 352} 353 354//===----------------------------------------------------------------------===// 355// Semantic Analysis for various Expression Types 356//===----------------------------------------------------------------------===// 357 358 359/// ActOnStringLiteral - The specified tokens were lexed as pasted string 360/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 361/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 362/// multiple tokens. However, the common case is that StringToks points to one 363/// string. 364/// 365Action::OwningExprResult 366Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 367 assert(NumStringToks && "Must have at least one string!"); 368 369 StringLiteralParser Literal(StringToks, NumStringToks, PP); 370 if (Literal.hadError) 371 return ExprError(); 372 373 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 374 for (unsigned i = 0; i != NumStringToks; ++i) 375 StringTokLocs.push_back(StringToks[i].getLocation()); 376 377 QualType StrTy = Context.CharTy; 378 if (Literal.AnyWide) StrTy = Context.getWCharType(); 379 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 380 381 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 382 if (getLangOptions().CPlusPlus) 383 StrTy.addConst(); 384 385 // Get an array type for the string, according to C99 6.4.5. This includes 386 // the nul terminator character as well as the string length for pascal 387 // strings. 388 StrTy = Context.getConstantArrayType(StrTy, 389 llvm::APInt(32, Literal.GetNumStringChars()+1), 390 ArrayType::Normal, 0); 391 392 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 393 return Owned(StringLiteral::Create(Context, Literal.GetString(), 394 Literal.GetStringLength(), 395 Literal.AnyWide, StrTy, 396 &StringTokLocs[0], 397 StringTokLocs.size())); 398} 399 400/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 401/// CurBlock to VD should cause it to be snapshotted (as we do for auto 402/// variables defined outside the block) or false if this is not needed (e.g. 403/// for values inside the block or for globals). 404/// 405/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 406/// up-to-date. 407/// 408static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 409 ValueDecl *VD) { 410 // If the value is defined inside the block, we couldn't snapshot it even if 411 // we wanted to. 412 if (CurBlock->TheDecl == VD->getDeclContext()) 413 return false; 414 415 // If this is an enum constant or function, it is constant, don't snapshot. 416 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 417 return false; 418 419 // If this is a reference to an extern, static, or global variable, no need to 420 // snapshot it. 421 // FIXME: What about 'const' variables in C++? 422 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 423 if (!Var->hasLocalStorage()) 424 return false; 425 426 // Blocks that have these can't be constant. 427 CurBlock->hasBlockDeclRefExprs = true; 428 429 // If we have nested blocks, the decl may be declared in an outer block (in 430 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 431 // be defined outside all of the current blocks (in which case the blocks do 432 // all get the bit). Walk the nesting chain. 433 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 434 NextBlock = NextBlock->PrevBlockInfo) { 435 // If we found the defining block for the variable, don't mark the block as 436 // having a reference outside it. 437 if (NextBlock->TheDecl == VD->getDeclContext()) 438 break; 439 440 // Otherwise, the DeclRef from the inner block causes the outer one to need 441 // a snapshot as well. 442 NextBlock->hasBlockDeclRefExprs = true; 443 } 444 445 return true; 446} 447 448 449 450/// ActOnIdentifierExpr - The parser read an identifier in expression context, 451/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 452/// identifier is used in a function call context. 453/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 454/// class or namespace that the identifier must be a member of. 455Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 456 IdentifierInfo &II, 457 bool HasTrailingLParen, 458 const CXXScopeSpec *SS, 459 bool isAddressOfOperand) { 460 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 461 isAddressOfOperand); 462} 463 464/// BuildDeclRefExpr - Build either a DeclRefExpr or a 465/// QualifiedDeclRefExpr based on whether or not SS is a 466/// nested-name-specifier. 467DeclRefExpr * 468Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 469 bool TypeDependent, bool ValueDependent, 470 const CXXScopeSpec *SS) { 471 if (SS && !SS->isEmpty()) { 472 return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 473 ValueDependent, SS->getRange(), 474 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 475 } else 476 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 477} 478 479/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 480/// variable corresponding to the anonymous union or struct whose type 481/// is Record. 482static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 483 RecordDecl *Record) { 484 assert(Record->isAnonymousStructOrUnion() && 485 "Record must be an anonymous struct or union!"); 486 487 // FIXME: Once Decls are directly linked together, this will 488 // be an O(1) operation rather than a slow walk through DeclContext's 489 // vector (which itself will be eliminated). DeclGroups might make 490 // this even better. 491 DeclContext *Ctx = Record->getDeclContext(); 492 for (DeclContext::decl_iterator D = Ctx->decls_begin(Context), 493 DEnd = Ctx->decls_end(Context); 494 D != DEnd; ++D) { 495 if (*D == Record) { 496 // The object for the anonymous struct/union directly 497 // follows its type in the list of declarations. 498 ++D; 499 assert(D != DEnd && "Missing object for anonymous record"); 500 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 501 return *D; 502 } 503 } 504 505 assert(false && "Missing object for anonymous record"); 506 return 0; 507} 508 509/// \brief Given a field that represents a member of an anonymous 510/// struct/union, build the path from that field's context to the 511/// actual member. 512/// 513/// Construct the sequence of field member references we'll have to 514/// perform to get to the field in the anonymous union/struct. The 515/// list of members is built from the field outward, so traverse it 516/// backwards to go from an object in the current context to the field 517/// we found. 518/// 519/// \returns The variable from which the field access should begin, 520/// for an anonymous struct/union that is not a member of another 521/// class. Otherwise, returns NULL. 522VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 523 llvm::SmallVectorImpl<FieldDecl *> &Path) { 524 assert(Field->getDeclContext()->isRecord() && 525 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 526 && "Field must be stored inside an anonymous struct or union"); 527 528 Path.push_back(Field); 529 VarDecl *BaseObject = 0; 530 DeclContext *Ctx = Field->getDeclContext(); 531 do { 532 RecordDecl *Record = cast<RecordDecl>(Ctx); 533 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 534 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 535 Path.push_back(AnonField); 536 else { 537 BaseObject = cast<VarDecl>(AnonObject); 538 break; 539 } 540 Ctx = Ctx->getParent(); 541 } while (Ctx->isRecord() && 542 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 543 544 return BaseObject; 545} 546 547Sema::OwningExprResult 548Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 549 FieldDecl *Field, 550 Expr *BaseObjectExpr, 551 SourceLocation OpLoc) { 552 llvm::SmallVector<FieldDecl *, 4> AnonFields; 553 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 554 AnonFields); 555 556 // Build the expression that refers to the base object, from 557 // which we will build a sequence of member references to each 558 // of the anonymous union objects and, eventually, the field we 559 // found via name lookup. 560 bool BaseObjectIsPointer = false; 561 unsigned ExtraQuals = 0; 562 if (BaseObject) { 563 // BaseObject is an anonymous struct/union variable (and is, 564 // therefore, not part of another non-anonymous record). 565 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 566 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 567 SourceLocation()); 568 ExtraQuals 569 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 570 } else if (BaseObjectExpr) { 571 // The caller provided the base object expression. Determine 572 // whether its a pointer and whether it adds any qualifiers to the 573 // anonymous struct/union fields we're looking into. 574 QualType ObjectType = BaseObjectExpr->getType(); 575 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 576 BaseObjectIsPointer = true; 577 ObjectType = ObjectPtr->getPointeeType(); 578 } 579 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 580 } else { 581 // We've found a member of an anonymous struct/union that is 582 // inside a non-anonymous struct/union, so in a well-formed 583 // program our base object expression is "this". 584 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 585 if (!MD->isStatic()) { 586 QualType AnonFieldType 587 = Context.getTagDeclType( 588 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 589 QualType ThisType = Context.getTagDeclType(MD->getParent()); 590 if ((Context.getCanonicalType(AnonFieldType) 591 == Context.getCanonicalType(ThisType)) || 592 IsDerivedFrom(ThisType, AnonFieldType)) { 593 // Our base object expression is "this". 594 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 595 MD->getThisType(Context)); 596 BaseObjectIsPointer = true; 597 } 598 } else { 599 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 600 << Field->getDeclName()); 601 } 602 ExtraQuals = MD->getTypeQualifiers(); 603 } 604 605 if (!BaseObjectExpr) 606 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 607 << Field->getDeclName()); 608 } 609 610 // Build the implicit member references to the field of the 611 // anonymous struct/union. 612 Expr *Result = BaseObjectExpr; 613 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 614 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 615 FI != FIEnd; ++FI) { 616 QualType MemberType = (*FI)->getType(); 617 if (!(*FI)->isMutable()) { 618 unsigned combinedQualifiers 619 = MemberType.getCVRQualifiers() | ExtraQuals; 620 MemberType = MemberType.getQualifiedType(combinedQualifiers); 621 } 622 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 623 OpLoc, MemberType); 624 BaseObjectIsPointer = false; 625 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 626 } 627 628 return Owned(Result); 629} 630 631/// ActOnDeclarationNameExpr - The parser has read some kind of name 632/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 633/// performs lookup on that name and returns an expression that refers 634/// to that name. This routine isn't directly called from the parser, 635/// because the parser doesn't know about DeclarationName. Rather, 636/// this routine is called by ActOnIdentifierExpr, 637/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 638/// which form the DeclarationName from the corresponding syntactic 639/// forms. 640/// 641/// HasTrailingLParen indicates whether this identifier is used in a 642/// function call context. LookupCtx is only used for a C++ 643/// qualified-id (foo::bar) to indicate the class or namespace that 644/// the identifier must be a member of. 645/// 646/// isAddressOfOperand means that this expression is the direct operand 647/// of an address-of operator. This matters because this is the only 648/// situation where a qualified name referencing a non-static member may 649/// appear outside a member function of this class. 650Sema::OwningExprResult 651Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 652 DeclarationName Name, bool HasTrailingLParen, 653 const CXXScopeSpec *SS, 654 bool isAddressOfOperand) { 655 // Could be enum-constant, value decl, instance variable, etc. 656 if (SS && SS->isInvalid()) 657 return ExprError(); 658 659 // C++ [temp.dep.expr]p3: 660 // An id-expression is type-dependent if it contains: 661 // -- a nested-name-specifier that contains a class-name that 662 // names a dependent type. 663 if (SS && isDependentScopeSpecifier(*SS)) { 664 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 665 Loc, SS->getRange(), 666 static_cast<NestedNameSpecifier *>(SS->getScopeRep()))); 667 } 668 669 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 670 false, true, Loc); 671 672 NamedDecl *D = 0; 673 if (Lookup.isAmbiguous()) { 674 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 675 SS && SS->isSet() ? SS->getRange() 676 : SourceRange()); 677 return ExprError(); 678 } else 679 D = Lookup.getAsDecl(); 680 681 // If this reference is in an Objective-C method, then ivar lookup happens as 682 // well. 683 IdentifierInfo *II = Name.getAsIdentifierInfo(); 684 if (II && getCurMethodDecl()) { 685 // There are two cases to handle here. 1) scoped lookup could have failed, 686 // in which case we should look for an ivar. 2) scoped lookup could have 687 // found a decl, but that decl is outside the current instance method (i.e. 688 // a global variable). In these two cases, we do a lookup for an ivar with 689 // this name, if the lookup sucedes, we replace it our current decl. 690 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 691 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 692 ObjCInterfaceDecl *ClassDeclared; 693 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 694 ClassDeclared)) { 695 // Check if referencing a field with __attribute__((deprecated)). 696 if (DiagnoseUseOfDecl(IV, Loc)) 697 return ExprError(); 698 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 699 // If a class method attemps to use a free standing ivar, this is 700 // an error. 701 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 702 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 703 << IV->getDeclName()); 704 // If a class method uses a global variable, even if an ivar with 705 // same name exists, use the global. 706 if (!IsClsMethod) { 707 if (IV->getAccessControl() == ObjCIvarDecl::Private && 708 ClassDeclared != IFace) 709 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 710 // FIXME: This should use a new expr for a direct reference, don't turn 711 // this into Self->ivar, just return a BareIVarExpr or something. 712 IdentifierInfo &II = Context.Idents.get("self"); 713 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 714 return Owned(new (Context) 715 ObjCIvarRefExpr(IV, IV->getType(), Loc, 716 static_cast<Expr*>(SelfExpr.release()), 717 true, true)); 718 } 719 } 720 } 721 else if (getCurMethodDecl()->isInstanceMethod()) { 722 // We should warn if a local variable hides an ivar. 723 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 724 ObjCInterfaceDecl *ClassDeclared; 725 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 726 ClassDeclared)) { 727 if (IV->getAccessControl() != ObjCIvarDecl::Private || 728 IFace == ClassDeclared) 729 Diag(Loc, diag::warn_ivar_use_hidden)<<IV->getDeclName(); 730 } 731 } 732 // Needed to implement property "super.method" notation. 733 if (D == 0 && II->isStr("super")) { 734 QualType T; 735 736 if (getCurMethodDecl()->isInstanceMethod()) 737 T = Context.getPointerType(Context.getObjCInterfaceType( 738 getCurMethodDecl()->getClassInterface())); 739 else 740 T = Context.getObjCClassType(); 741 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 742 } 743 } 744 745 // Determine whether this name might be a candidate for 746 // argument-dependent lookup. 747 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 748 HasTrailingLParen; 749 750 if (ADL && D == 0) { 751 // We've seen something of the form 752 // 753 // identifier( 754 // 755 // and we did not find any entity by the name 756 // "identifier". However, this identifier is still subject to 757 // argument-dependent lookup, so keep track of the name. 758 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 759 Context.OverloadTy, 760 Loc)); 761 } 762 763 if (D == 0) { 764 // Otherwise, this could be an implicitly declared function reference (legal 765 // in C90, extension in C99). 766 if (HasTrailingLParen && II && 767 !getLangOptions().CPlusPlus) // Not in C++. 768 D = ImplicitlyDefineFunction(Loc, *II, S); 769 else { 770 // If this name wasn't predeclared and if this is not a function call, 771 // diagnose the problem. 772 if (SS && !SS->isEmpty()) 773 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 774 << Name << SS->getRange()); 775 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 776 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 777 return ExprError(Diag(Loc, diag::err_undeclared_use) 778 << Name.getAsString()); 779 else 780 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 781 } 782 } 783 784 // If this is an expression of the form &Class::member, don't build an 785 // implicit member ref, because we want a pointer to the member in general, 786 // not any specific instance's member. 787 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 788 DeclContext *DC = computeDeclContext(*SS); 789 if (D && isa<CXXRecordDecl>(DC)) { 790 QualType DType; 791 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 792 DType = FD->getType().getNonReferenceType(); 793 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 794 DType = Method->getType(); 795 } else if (isa<OverloadedFunctionDecl>(D)) { 796 DType = Context.OverloadTy; 797 } 798 // Could be an inner type. That's diagnosed below, so ignore it here. 799 if (!DType.isNull()) { 800 // The pointer is type- and value-dependent if it points into something 801 // dependent. 802 bool Dependent = false; 803 for (; DC; DC = DC->getParent()) { 804 // FIXME: could stop early at namespace scope. 805 if (DC->isRecord()) { 806 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 807 if (Context.getTypeDeclType(Record)->isDependentType()) { 808 Dependent = true; 809 break; 810 } 811 } 812 } 813 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 814 } 815 } 816 } 817 818 // We may have found a field within an anonymous union or struct 819 // (C++ [class.union]). 820 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 821 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 822 return BuildAnonymousStructUnionMemberReference(Loc, FD); 823 824 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 825 if (!MD->isStatic()) { 826 // C++ [class.mfct.nonstatic]p2: 827 // [...] if name lookup (3.4.1) resolves the name in the 828 // id-expression to a nonstatic nontype member of class X or of 829 // a base class of X, the id-expression is transformed into a 830 // class member access expression (5.2.5) using (*this) (9.3.2) 831 // as the postfix-expression to the left of the '.' operator. 832 DeclContext *Ctx = 0; 833 QualType MemberType; 834 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 835 Ctx = FD->getDeclContext(); 836 MemberType = FD->getType(); 837 838 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 839 MemberType = RefType->getPointeeType(); 840 else if (!FD->isMutable()) { 841 unsigned combinedQualifiers 842 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 843 MemberType = MemberType.getQualifiedType(combinedQualifiers); 844 } 845 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 846 if (!Method->isStatic()) { 847 Ctx = Method->getParent(); 848 MemberType = Method->getType(); 849 } 850 } else if (OverloadedFunctionDecl *Ovl 851 = dyn_cast<OverloadedFunctionDecl>(D)) { 852 for (OverloadedFunctionDecl::function_iterator 853 Func = Ovl->function_begin(), 854 FuncEnd = Ovl->function_end(); 855 Func != FuncEnd; ++Func) { 856 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 857 if (!DMethod->isStatic()) { 858 Ctx = Ovl->getDeclContext(); 859 MemberType = Context.OverloadTy; 860 break; 861 } 862 } 863 } 864 865 if (Ctx && Ctx->isRecord()) { 866 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 867 QualType ThisType = Context.getTagDeclType(MD->getParent()); 868 if ((Context.getCanonicalType(CtxType) 869 == Context.getCanonicalType(ThisType)) || 870 IsDerivedFrom(ThisType, CtxType)) { 871 // Build the implicit member access expression. 872 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 873 MD->getThisType(Context)); 874 return Owned(new (Context) MemberExpr(This, true, D, 875 SourceLocation(), MemberType)); 876 } 877 } 878 } 879 } 880 881 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 882 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 883 if (MD->isStatic()) 884 // "invalid use of member 'x' in static member function" 885 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 886 << FD->getDeclName()); 887 } 888 889 // Any other ways we could have found the field in a well-formed 890 // program would have been turned into implicit member expressions 891 // above. 892 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 893 << FD->getDeclName()); 894 } 895 896 if (isa<TypedefDecl>(D)) 897 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 898 if (isa<ObjCInterfaceDecl>(D)) 899 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 900 if (isa<NamespaceDecl>(D)) 901 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 902 903 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 904 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 905 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 906 false, false, SS)); 907 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 908 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 909 false, false, SS)); 910 ValueDecl *VD = cast<ValueDecl>(D); 911 912 // Check whether this declaration can be used. Note that we suppress 913 // this check when we're going to perform argument-dependent lookup 914 // on this function name, because this might not be the function 915 // that overload resolution actually selects. 916 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 917 return ExprError(); 918 919 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 920 // Warn about constructs like: 921 // if (void *X = foo()) { ... } else { X }. 922 // In the else block, the pointer is always false. 923 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 924 Scope *CheckS = S; 925 while (CheckS) { 926 if (CheckS->isWithinElse() && 927 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 928 if (Var->getType()->isBooleanType()) 929 ExprError(Diag(Loc, diag::warn_value_always_false) 930 << Var->getDeclName()); 931 else 932 ExprError(Diag(Loc, diag::warn_value_always_zero) 933 << Var->getDeclName()); 934 break; 935 } 936 937 // Move up one more control parent to check again. 938 CheckS = CheckS->getControlParent(); 939 if (CheckS) 940 CheckS = CheckS->getParent(); 941 } 942 } 943 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 944 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 945 // C99 DR 316 says that, if a function type comes from a 946 // function definition (without a prototype), that type is only 947 // used for checking compatibility. Therefore, when referencing 948 // the function, we pretend that we don't have the full function 949 // type. 950 QualType T = Func->getType(); 951 QualType NoProtoType = T; 952 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 953 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 954 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 955 } 956 } 957 958 // Only create DeclRefExpr's for valid Decl's. 959 if (VD->isInvalidDecl()) 960 return ExprError(); 961 962 // If the identifier reference is inside a block, and it refers to a value 963 // that is outside the block, create a BlockDeclRefExpr instead of a 964 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 965 // the block is formed. 966 // 967 // We do not do this for things like enum constants, global variables, etc, 968 // as they do not get snapshotted. 969 // 970 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 971 QualType ExprTy = VD->getType().getNonReferenceType(); 972 // The BlocksAttr indicates the variable is bound by-reference. 973 if (VD->getAttr<BlocksAttr>()) 974 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 975 976 // Variable will be bound by-copy, make it const within the closure. 977 ExprTy.addConst(); 978 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false)); 979 } 980 // If this reference is not in a block or if the referenced variable is 981 // within the block, create a normal DeclRefExpr. 982 983 bool TypeDependent = false; 984 bool ValueDependent = false; 985 if (getLangOptions().CPlusPlus) { 986 // C++ [temp.dep.expr]p3: 987 // An id-expression is type-dependent if it contains: 988 // - an identifier that was declared with a dependent type, 989 if (VD->getType()->isDependentType()) 990 TypeDependent = true; 991 // - FIXME: a template-id that is dependent, 992 // - a conversion-function-id that specifies a dependent type, 993 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 994 Name.getCXXNameType()->isDependentType()) 995 TypeDependent = true; 996 // - a nested-name-specifier that contains a class-name that 997 // names a dependent type. 998 else if (SS && !SS->isEmpty()) { 999 for (DeclContext *DC = computeDeclContext(*SS); 1000 DC; DC = DC->getParent()) { 1001 // FIXME: could stop early at namespace scope. 1002 if (DC->isRecord()) { 1003 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1004 if (Context.getTypeDeclType(Record)->isDependentType()) { 1005 TypeDependent = true; 1006 break; 1007 } 1008 } 1009 } 1010 } 1011 1012 // C++ [temp.dep.constexpr]p2: 1013 // 1014 // An identifier is value-dependent if it is: 1015 // - a name declared with a dependent type, 1016 if (TypeDependent) 1017 ValueDependent = true; 1018 // - the name of a non-type template parameter, 1019 else if (isa<NonTypeTemplateParmDecl>(VD)) 1020 ValueDependent = true; 1021 // - a constant with integral or enumeration type and is 1022 // initialized with an expression that is value-dependent 1023 // (FIXME!). 1024 } 1025 1026 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1027 TypeDependent, ValueDependent, SS)); 1028} 1029 1030Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1031 tok::TokenKind Kind) { 1032 PredefinedExpr::IdentType IT; 1033 1034 switch (Kind) { 1035 default: assert(0 && "Unknown simple primary expr!"); 1036 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1037 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1038 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1039 } 1040 1041 // Pre-defined identifiers are of type char[x], where x is the length of the 1042 // string. 1043 unsigned Length; 1044 if (FunctionDecl *FD = getCurFunctionDecl()) 1045 Length = FD->getIdentifier()->getLength(); 1046 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1047 Length = MD->getSynthesizedMethodSize(); 1048 else { 1049 Diag(Loc, diag::ext_predef_outside_function); 1050 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1051 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1052 } 1053 1054 1055 llvm::APInt LengthI(32, Length + 1); 1056 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1057 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1058 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1059} 1060 1061Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1062 llvm::SmallString<16> CharBuffer; 1063 CharBuffer.resize(Tok.getLength()); 1064 const char *ThisTokBegin = &CharBuffer[0]; 1065 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1066 1067 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1068 Tok.getLocation(), PP); 1069 if (Literal.hadError()) 1070 return ExprError(); 1071 1072 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1073 1074 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1075 Literal.isWide(), 1076 type, Tok.getLocation())); 1077} 1078 1079Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1080 // Fast path for a single digit (which is quite common). A single digit 1081 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1082 if (Tok.getLength() == 1) { 1083 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1084 unsigned IntSize = Context.Target.getIntWidth(); 1085 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1086 Context.IntTy, Tok.getLocation())); 1087 } 1088 1089 llvm::SmallString<512> IntegerBuffer; 1090 // Add padding so that NumericLiteralParser can overread by one character. 1091 IntegerBuffer.resize(Tok.getLength()+1); 1092 const char *ThisTokBegin = &IntegerBuffer[0]; 1093 1094 // Get the spelling of the token, which eliminates trigraphs, etc. 1095 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1096 1097 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1098 Tok.getLocation(), PP); 1099 if (Literal.hadError) 1100 return ExprError(); 1101 1102 Expr *Res; 1103 1104 if (Literal.isFloatingLiteral()) { 1105 QualType Ty; 1106 if (Literal.isFloat) 1107 Ty = Context.FloatTy; 1108 else if (!Literal.isLong) 1109 Ty = Context.DoubleTy; 1110 else 1111 Ty = Context.LongDoubleTy; 1112 1113 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1114 1115 // isExact will be set by GetFloatValue(). 1116 bool isExact = false; 1117 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1118 &isExact, Ty, Tok.getLocation()); 1119 1120 } else if (!Literal.isIntegerLiteral()) { 1121 return ExprError(); 1122 } else { 1123 QualType Ty; 1124 1125 // long long is a C99 feature. 1126 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1127 Literal.isLongLong) 1128 Diag(Tok.getLocation(), diag::ext_longlong); 1129 1130 // Get the value in the widest-possible width. 1131 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1132 1133 if (Literal.GetIntegerValue(ResultVal)) { 1134 // If this value didn't fit into uintmax_t, warn and force to ull. 1135 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1136 Ty = Context.UnsignedLongLongTy; 1137 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1138 "long long is not intmax_t?"); 1139 } else { 1140 // If this value fits into a ULL, try to figure out what else it fits into 1141 // according to the rules of C99 6.4.4.1p5. 1142 1143 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1144 // be an unsigned int. 1145 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1146 1147 // Check from smallest to largest, picking the smallest type we can. 1148 unsigned Width = 0; 1149 if (!Literal.isLong && !Literal.isLongLong) { 1150 // Are int/unsigned possibilities? 1151 unsigned IntSize = Context.Target.getIntWidth(); 1152 1153 // Does it fit in a unsigned int? 1154 if (ResultVal.isIntN(IntSize)) { 1155 // Does it fit in a signed int? 1156 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1157 Ty = Context.IntTy; 1158 else if (AllowUnsigned) 1159 Ty = Context.UnsignedIntTy; 1160 Width = IntSize; 1161 } 1162 } 1163 1164 // Are long/unsigned long possibilities? 1165 if (Ty.isNull() && !Literal.isLongLong) { 1166 unsigned LongSize = Context.Target.getLongWidth(); 1167 1168 // Does it fit in a unsigned long? 1169 if (ResultVal.isIntN(LongSize)) { 1170 // Does it fit in a signed long? 1171 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1172 Ty = Context.LongTy; 1173 else if (AllowUnsigned) 1174 Ty = Context.UnsignedLongTy; 1175 Width = LongSize; 1176 } 1177 } 1178 1179 // Finally, check long long if needed. 1180 if (Ty.isNull()) { 1181 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1182 1183 // Does it fit in a unsigned long long? 1184 if (ResultVal.isIntN(LongLongSize)) { 1185 // Does it fit in a signed long long? 1186 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1187 Ty = Context.LongLongTy; 1188 else if (AllowUnsigned) 1189 Ty = Context.UnsignedLongLongTy; 1190 Width = LongLongSize; 1191 } 1192 } 1193 1194 // If we still couldn't decide a type, we probably have something that 1195 // does not fit in a signed long long, but has no U suffix. 1196 if (Ty.isNull()) { 1197 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1198 Ty = Context.UnsignedLongLongTy; 1199 Width = Context.Target.getLongLongWidth(); 1200 } 1201 1202 if (ResultVal.getBitWidth() != Width) 1203 ResultVal.trunc(Width); 1204 } 1205 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1206 } 1207 1208 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1209 if (Literal.isImaginary) 1210 Res = new (Context) ImaginaryLiteral(Res, 1211 Context.getComplexType(Res->getType())); 1212 1213 return Owned(Res); 1214} 1215 1216Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1217 SourceLocation R, ExprArg Val) { 1218 Expr *E = (Expr *)Val.release(); 1219 assert((E != 0) && "ActOnParenExpr() missing expr"); 1220 return Owned(new (Context) ParenExpr(L, R, E)); 1221} 1222 1223/// The UsualUnaryConversions() function is *not* called by this routine. 1224/// See C99 6.3.2.1p[2-4] for more details. 1225bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1226 SourceLocation OpLoc, 1227 const SourceRange &ExprRange, 1228 bool isSizeof) { 1229 if (exprType->isDependentType()) 1230 return false; 1231 1232 // C99 6.5.3.4p1: 1233 if (isa<FunctionType>(exprType)) { 1234 // alignof(function) is allowed. 1235 if (isSizeof) 1236 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1237 return false; 1238 } 1239 1240 if (exprType->isVoidType()) { 1241 Diag(OpLoc, diag::ext_sizeof_void_type) 1242 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1243 return false; 1244 } 1245 1246 // sizeof(interface) and sizeof(interface<proto>) 1247 if (const ObjCInterfaceType *IIT = exprType->getAsObjCInterfaceType()) { 1248 if (IIT->getDecl()->isForwardDecl()) { 1249 Diag(OpLoc, diag::err_sizeof_forward_interface) 1250 << IIT->getDecl()->getDeclName() << isSizeof; 1251 return true; 1252 } 1253 1254 if (LangOpts.ObjCNonFragileABI) { 1255 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1256 << IIT->getDecl()->getDeclName() << isSizeof; 1257 //return false; 1258 } 1259 } 1260 1261 return RequireCompleteType(OpLoc, exprType, 1262 isSizeof ? diag::err_sizeof_incomplete_type : 1263 diag::err_alignof_incomplete_type, 1264 ExprRange); 1265} 1266 1267bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1268 const SourceRange &ExprRange) { 1269 E = E->IgnoreParens(); 1270 1271 // alignof decl is always ok. 1272 if (isa<DeclRefExpr>(E)) 1273 return false; 1274 1275 // Cannot know anything else if the expression is dependent. 1276 if (E->isTypeDependent()) 1277 return false; 1278 1279 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1280 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { 1281 if (FD->isBitField()) { 1282 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1283 return true; 1284 } 1285 // Other fields are ok. 1286 return false; 1287 } 1288 } 1289 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1290} 1291 1292/// \brief Build a sizeof or alignof expression given a type operand. 1293Action::OwningExprResult 1294Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1295 bool isSizeOf, SourceRange R) { 1296 if (T.isNull()) 1297 return ExprError(); 1298 1299 if (!T->isDependentType() && 1300 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1301 return ExprError(); 1302 1303 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1304 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1305 Context.getSizeType(), OpLoc, 1306 R.getEnd())); 1307} 1308 1309/// \brief Build a sizeof or alignof expression given an expression 1310/// operand. 1311Action::OwningExprResult 1312Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1313 bool isSizeOf, SourceRange R) { 1314 // Verify that the operand is valid. 1315 bool isInvalid = false; 1316 if (E->isTypeDependent()) { 1317 // Delay type-checking for type-dependent expressions. 1318 } else if (!isSizeOf) { 1319 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1320 } else if (E->isBitField()) { // C99 6.5.3.4p1. 1321 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1322 isInvalid = true; 1323 } else { 1324 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1325 } 1326 1327 if (isInvalid) 1328 return ExprError(); 1329 1330 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1331 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1332 Context.getSizeType(), OpLoc, 1333 R.getEnd())); 1334} 1335 1336/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1337/// the same for @c alignof and @c __alignof 1338/// Note that the ArgRange is invalid if isType is false. 1339Action::OwningExprResult 1340Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1341 void *TyOrEx, const SourceRange &ArgRange) { 1342 // If error parsing type, ignore. 1343 if (TyOrEx == 0) return ExprError(); 1344 1345 if (isType) { 1346 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1347 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1348 } 1349 1350 // Get the end location. 1351 Expr *ArgEx = (Expr *)TyOrEx; 1352 Action::OwningExprResult Result 1353 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1354 1355 if (Result.isInvalid()) 1356 DeleteExpr(ArgEx); 1357 1358 return move(Result); 1359} 1360 1361QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1362 if (V->isTypeDependent()) 1363 return Context.DependentTy; 1364 1365 // These operators return the element type of a complex type. 1366 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1367 return CT->getElementType(); 1368 1369 // Otherwise they pass through real integer and floating point types here. 1370 if (V->getType()->isArithmeticType()) 1371 return V->getType(); 1372 1373 // Reject anything else. 1374 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1375 << (isReal ? "__real" : "__imag"); 1376 return QualType(); 1377} 1378 1379 1380 1381Action::OwningExprResult 1382Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1383 tok::TokenKind Kind, ExprArg Input) { 1384 Expr *Arg = (Expr *)Input.get(); 1385 1386 UnaryOperator::Opcode Opc; 1387 switch (Kind) { 1388 default: assert(0 && "Unknown unary op!"); 1389 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1390 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1391 } 1392 1393 if (getLangOptions().CPlusPlus && 1394 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1395 // Which overloaded operator? 1396 OverloadedOperatorKind OverOp = 1397 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1398 1399 // C++ [over.inc]p1: 1400 // 1401 // [...] If the function is a member function with one 1402 // parameter (which shall be of type int) or a non-member 1403 // function with two parameters (the second of which shall be 1404 // of type int), it defines the postfix increment operator ++ 1405 // for objects of that type. When the postfix increment is 1406 // called as a result of using the ++ operator, the int 1407 // argument will have value zero. 1408 Expr *Args[2] = { 1409 Arg, 1410 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1411 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1412 }; 1413 1414 // Build the candidate set for overloading 1415 OverloadCandidateSet CandidateSet; 1416 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1417 1418 // Perform overload resolution. 1419 OverloadCandidateSet::iterator Best; 1420 switch (BestViableFunction(CandidateSet, Best)) { 1421 case OR_Success: { 1422 // We found a built-in operator or an overloaded operator. 1423 FunctionDecl *FnDecl = Best->Function; 1424 1425 if (FnDecl) { 1426 // We matched an overloaded operator. Build a call to that 1427 // operator. 1428 1429 // Convert the arguments. 1430 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1431 if (PerformObjectArgumentInitialization(Arg, Method)) 1432 return ExprError(); 1433 } else { 1434 // Convert the arguments. 1435 if (PerformCopyInitialization(Arg, 1436 FnDecl->getParamDecl(0)->getType(), 1437 "passing")) 1438 return ExprError(); 1439 } 1440 1441 // Determine the result type 1442 QualType ResultTy 1443 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1444 ResultTy = ResultTy.getNonReferenceType(); 1445 1446 // Build the actual expression node. 1447 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1448 SourceLocation()); 1449 UsualUnaryConversions(FnExpr); 1450 1451 Input.release(); 1452 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1453 Args, 2, ResultTy, 1454 OpLoc)); 1455 } else { 1456 // We matched a built-in operator. Convert the arguments, then 1457 // break out so that we will build the appropriate built-in 1458 // operator node. 1459 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1460 "passing")) 1461 return ExprError(); 1462 1463 break; 1464 } 1465 } 1466 1467 case OR_No_Viable_Function: 1468 // No viable function; fall through to handling this as a 1469 // built-in operator, which will produce an error message for us. 1470 break; 1471 1472 case OR_Ambiguous: 1473 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1474 << UnaryOperator::getOpcodeStr(Opc) 1475 << Arg->getSourceRange(); 1476 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1477 return ExprError(); 1478 1479 case OR_Deleted: 1480 Diag(OpLoc, diag::err_ovl_deleted_oper) 1481 << Best->Function->isDeleted() 1482 << UnaryOperator::getOpcodeStr(Opc) 1483 << Arg->getSourceRange(); 1484 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1485 return ExprError(); 1486 } 1487 1488 // Either we found no viable overloaded operator or we matched a 1489 // built-in operator. In either case, fall through to trying to 1490 // build a built-in operation. 1491 } 1492 1493 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1494 Opc == UnaryOperator::PostInc); 1495 if (result.isNull()) 1496 return ExprError(); 1497 Input.release(); 1498 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1499} 1500 1501Action::OwningExprResult 1502Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1503 ExprArg Idx, SourceLocation RLoc) { 1504 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1505 *RHSExp = static_cast<Expr*>(Idx.get()); 1506 1507 if (getLangOptions().CPlusPlus && 1508 (LHSExp->getType()->isRecordType() || 1509 LHSExp->getType()->isEnumeralType() || 1510 RHSExp->getType()->isRecordType() || 1511 RHSExp->getType()->isEnumeralType())) { 1512 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1513 // to the candidate set. 1514 OverloadCandidateSet CandidateSet; 1515 Expr *Args[2] = { LHSExp, RHSExp }; 1516 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1517 SourceRange(LLoc, RLoc)); 1518 1519 // Perform overload resolution. 1520 OverloadCandidateSet::iterator Best; 1521 switch (BestViableFunction(CandidateSet, Best)) { 1522 case OR_Success: { 1523 // We found a built-in operator or an overloaded operator. 1524 FunctionDecl *FnDecl = Best->Function; 1525 1526 if (FnDecl) { 1527 // We matched an overloaded operator. Build a call to that 1528 // operator. 1529 1530 // Convert the arguments. 1531 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1532 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1533 PerformCopyInitialization(RHSExp, 1534 FnDecl->getParamDecl(0)->getType(), 1535 "passing")) 1536 return ExprError(); 1537 } else { 1538 // Convert the arguments. 1539 if (PerformCopyInitialization(LHSExp, 1540 FnDecl->getParamDecl(0)->getType(), 1541 "passing") || 1542 PerformCopyInitialization(RHSExp, 1543 FnDecl->getParamDecl(1)->getType(), 1544 "passing")) 1545 return ExprError(); 1546 } 1547 1548 // Determine the result type 1549 QualType ResultTy 1550 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1551 ResultTy = ResultTy.getNonReferenceType(); 1552 1553 // Build the actual expression node. 1554 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1555 SourceLocation()); 1556 UsualUnaryConversions(FnExpr); 1557 1558 Base.release(); 1559 Idx.release(); 1560 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1561 FnExpr, Args, 2, 1562 ResultTy, LLoc)); 1563 } else { 1564 // We matched a built-in operator. Convert the arguments, then 1565 // break out so that we will build the appropriate built-in 1566 // operator node. 1567 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1568 "passing") || 1569 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1570 "passing")) 1571 return ExprError(); 1572 1573 break; 1574 } 1575 } 1576 1577 case OR_No_Viable_Function: 1578 // No viable function; fall through to handling this as a 1579 // built-in operator, which will produce an error message for us. 1580 break; 1581 1582 case OR_Ambiguous: 1583 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1584 << "[]" 1585 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1586 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1587 return ExprError(); 1588 1589 case OR_Deleted: 1590 Diag(LLoc, diag::err_ovl_deleted_oper) 1591 << Best->Function->isDeleted() 1592 << "[]" 1593 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1594 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1595 return ExprError(); 1596 } 1597 1598 // Either we found no viable overloaded operator or we matched a 1599 // built-in operator. In either case, fall through to trying to 1600 // build a built-in operation. 1601 } 1602 1603 // Perform default conversions. 1604 DefaultFunctionArrayConversion(LHSExp); 1605 DefaultFunctionArrayConversion(RHSExp); 1606 1607 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1608 1609 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1610 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1611 // in the subscript position. As a result, we need to derive the array base 1612 // and index from the expression types. 1613 Expr *BaseExpr, *IndexExpr; 1614 QualType ResultType; 1615 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1616 BaseExpr = LHSExp; 1617 IndexExpr = RHSExp; 1618 ResultType = Context.DependentTy; 1619 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1620 BaseExpr = LHSExp; 1621 IndexExpr = RHSExp; 1622 // FIXME: need to deal with const... 1623 ResultType = PTy->getPointeeType(); 1624 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1625 // Handle the uncommon case of "123[Ptr]". 1626 BaseExpr = RHSExp; 1627 IndexExpr = LHSExp; 1628 // FIXME: need to deal with const... 1629 ResultType = PTy->getPointeeType(); 1630 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1631 BaseExpr = LHSExp; // vectors: V[123] 1632 IndexExpr = RHSExp; 1633 1634 // FIXME: need to deal with const... 1635 ResultType = VTy->getElementType(); 1636 } else { 1637 return ExprError(Diag(LHSExp->getLocStart(), 1638 diag::err_typecheck_subscript_value) << RHSExp->getSourceRange()); 1639 } 1640 // C99 6.5.2.1p1 1641 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1642 return ExprError(Diag(IndexExpr->getLocStart(), 1643 diag::err_typecheck_subscript) << IndexExpr->getSourceRange()); 1644 1645 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1646 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1647 // type. Note that Functions are not objects, and that (in C99 parlance) 1648 // incomplete types are not object types. 1649 if (ResultType->isFunctionType()) { 1650 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1651 << ResultType << BaseExpr->getSourceRange(); 1652 return ExprError(); 1653 } 1654 if (!ResultType->isDependentType() && 1655 RequireCompleteType(BaseExpr->getLocStart(), ResultType, 1656 diag::err_subscript_incomplete_type, 1657 BaseExpr->getSourceRange())) 1658 return ExprError(); 1659 1660 Base.release(); 1661 Idx.release(); 1662 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1663 ResultType, RLoc)); 1664} 1665 1666QualType Sema:: 1667CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1668 IdentifierInfo &CompName, SourceLocation CompLoc) { 1669 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1670 1671 // The vector accessor can't exceed the number of elements. 1672 const char *compStr = CompName.getName(); 1673 1674 // This flag determines whether or not the component is one of the four 1675 // special names that indicate a subset of exactly half the elements are 1676 // to be selected. 1677 bool HalvingSwizzle = false; 1678 1679 // This flag determines whether or not CompName has an 's' char prefix, 1680 // indicating that it is a string of hex values to be used as vector indices. 1681 bool HexSwizzle = *compStr == 's'; 1682 1683 // Check that we've found one of the special components, or that the component 1684 // names must come from the same set. 1685 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1686 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1687 HalvingSwizzle = true; 1688 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1689 do 1690 compStr++; 1691 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1692 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1693 do 1694 compStr++; 1695 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1696 } 1697 1698 if (!HalvingSwizzle && *compStr) { 1699 // We didn't get to the end of the string. This means the component names 1700 // didn't come from the same set *or* we encountered an illegal name. 1701 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1702 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1703 return QualType(); 1704 } 1705 1706 // Ensure no component accessor exceeds the width of the vector type it 1707 // operates on. 1708 if (!HalvingSwizzle) { 1709 compStr = CompName.getName(); 1710 1711 if (HexSwizzle) 1712 compStr++; 1713 1714 while (*compStr) { 1715 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1716 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1717 << baseType << SourceRange(CompLoc); 1718 return QualType(); 1719 } 1720 } 1721 } 1722 1723 // If this is a halving swizzle, verify that the base type has an even 1724 // number of elements. 1725 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1726 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1727 << baseType << SourceRange(CompLoc); 1728 return QualType(); 1729 } 1730 1731 // The component accessor looks fine - now we need to compute the actual type. 1732 // The vector type is implied by the component accessor. For example, 1733 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1734 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1735 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1736 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1737 : CompName.getLength(); 1738 if (HexSwizzle) 1739 CompSize--; 1740 1741 if (CompSize == 1) 1742 return vecType->getElementType(); 1743 1744 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1745 // Now look up the TypeDefDecl from the vector type. Without this, 1746 // diagostics look bad. We want extended vector types to appear built-in. 1747 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1748 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1749 return Context.getTypedefType(ExtVectorDecls[i]); 1750 } 1751 return VT; // should never get here (a typedef type should always be found). 1752} 1753 1754static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1755 IdentifierInfo &Member, 1756 const Selector &Sel, 1757 ASTContext &Context) { 1758 1759 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Context, &Member)) 1760 return PD; 1761 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Context, Sel)) 1762 return OMD; 1763 1764 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1765 E = PDecl->protocol_end(); I != E; ++I) { 1766 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1767 Context)) 1768 return D; 1769 } 1770 return 0; 1771} 1772 1773static Decl *FindGetterNameDecl(const ObjCQualifiedIdType *QIdTy, 1774 IdentifierInfo &Member, 1775 const Selector &Sel, 1776 ASTContext &Context) { 1777 // Check protocols on qualified interfaces. 1778 Decl *GDecl = 0; 1779 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1780 E = QIdTy->qual_end(); I != E; ++I) { 1781 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, &Member)) { 1782 GDecl = PD; 1783 break; 1784 } 1785 // Also must look for a getter name which uses property syntax. 1786 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Context, Sel)) { 1787 GDecl = OMD; 1788 break; 1789 } 1790 } 1791 if (!GDecl) { 1792 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1793 E = QIdTy->qual_end(); I != E; ++I) { 1794 // Search in the protocol-qualifier list of current protocol. 1795 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 1796 if (GDecl) 1797 return GDecl; 1798 } 1799 } 1800 return GDecl; 1801} 1802 1803/// FindMethodInNestedImplementations - Look up a method in current and 1804/// all base class implementations. 1805/// 1806ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 1807 const ObjCInterfaceDecl *IFace, 1808 const Selector &Sel) { 1809 ObjCMethodDecl *Method = 0; 1810 if (ObjCImplementationDecl *ImpDecl = 1811 Sema::ObjCImplementations[IFace->getIdentifier()]) 1812 Method = ImpDecl->getInstanceMethod(Context, Sel); 1813 1814 if (!Method && IFace->getSuperClass()) 1815 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 1816 return Method; 1817} 1818 1819Action::OwningExprResult 1820Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1821 tok::TokenKind OpKind, SourceLocation MemberLoc, 1822 IdentifierInfo &Member, 1823 DeclPtrTy ObjCImpDecl) { 1824 Expr *BaseExpr = static_cast<Expr *>(Base.release()); 1825 assert(BaseExpr && "no record expression"); 1826 1827 // Perform default conversions. 1828 DefaultFunctionArrayConversion(BaseExpr); 1829 1830 QualType BaseType = BaseExpr->getType(); 1831 assert(!BaseType.isNull() && "no type for member expression"); 1832 1833 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1834 // must have pointer type, and the accessed type is the pointee. 1835 if (OpKind == tok::arrow) { 1836 if (const PointerType *PT = BaseType->getAsPointerType()) 1837 BaseType = PT->getPointeeType(); 1838 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1839 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1840 MemberLoc, Member)); 1841 else 1842 return ExprError(Diag(MemberLoc, 1843 diag::err_typecheck_member_reference_arrow) 1844 << BaseType << BaseExpr->getSourceRange()); 1845 } 1846 1847 // Handle field access to simple records. This also handles access to fields 1848 // of the ObjC 'id' struct. 1849 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1850 RecordDecl *RDecl = RTy->getDecl(); 1851 if (RequireCompleteType(OpLoc, BaseType, 1852 diag::err_typecheck_incomplete_tag, 1853 BaseExpr->getSourceRange())) 1854 return ExprError(); 1855 1856 // The record definition is complete, now make sure the member is valid. 1857 // FIXME: Qualified name lookup for C++ is a bit more complicated 1858 // than this. 1859 LookupResult Result 1860 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1861 LookupMemberName, false); 1862 1863 if (!Result) 1864 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1865 << &Member << BaseExpr->getSourceRange()); 1866 if (Result.isAmbiguous()) { 1867 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1868 MemberLoc, BaseExpr->getSourceRange()); 1869 return ExprError(); 1870 } 1871 1872 NamedDecl *MemberDecl = Result; 1873 1874 // If the decl being referenced had an error, return an error for this 1875 // sub-expr without emitting another error, in order to avoid cascading 1876 // error cases. 1877 if (MemberDecl->isInvalidDecl()) 1878 return ExprError(); 1879 1880 // Check the use of this field 1881 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 1882 return ExprError(); 1883 1884 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1885 // We may have found a field within an anonymous union or struct 1886 // (C++ [class.union]). 1887 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1888 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1889 BaseExpr, OpLoc); 1890 1891 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1892 // FIXME: Handle address space modifiers 1893 QualType MemberType = FD->getType(); 1894 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1895 MemberType = Ref->getPointeeType(); 1896 else { 1897 unsigned combinedQualifiers = 1898 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1899 if (FD->isMutable()) 1900 combinedQualifiers &= ~QualType::Const; 1901 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1902 } 1903 1904 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1905 MemberLoc, MemberType)); 1906 } 1907 1908 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) 1909 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1910 Var, MemberLoc, 1911 Var->getType().getNonReferenceType())); 1912 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 1913 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1914 MemberFn, MemberLoc, 1915 MemberFn->getType())); 1916 if (OverloadedFunctionDecl *Ovl 1917 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 1918 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 1919 MemberLoc, Context.OverloadTy)); 1920 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 1921 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1922 Enum, MemberLoc, Enum->getType())); 1923 if (isa<TypeDecl>(MemberDecl)) 1924 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 1925 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1926 1927 // We found a declaration kind that we didn't expect. This is a 1928 // generic error message that tells the user that she can't refer 1929 // to this member with '.' or '->'. 1930 return ExprError(Diag(MemberLoc, 1931 diag::err_typecheck_member_reference_unknown) 1932 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1933 } 1934 1935 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1936 // (*Obj).ivar. 1937 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1938 ObjCInterfaceDecl *ClassDeclared; 1939 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(Context, 1940 &Member, 1941 ClassDeclared)) { 1942 // If the decl being referenced had an error, return an error for this 1943 // sub-expr without emitting another error, in order to avoid cascading 1944 // error cases. 1945 if (IV->isInvalidDecl()) 1946 return ExprError(); 1947 1948 // Check whether we can reference this field. 1949 if (DiagnoseUseOfDecl(IV, MemberLoc)) 1950 return ExprError(); 1951 if (IV->getAccessControl() != ObjCIvarDecl::Public && 1952 IV->getAccessControl() != ObjCIvarDecl::Package) { 1953 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 1954 if (ObjCMethodDecl *MD = getCurMethodDecl()) 1955 ClassOfMethodDecl = MD->getClassInterface(); 1956 else if (ObjCImpDecl && getCurFunctionDecl()) { 1957 // Case of a c-function declared inside an objc implementation. 1958 // FIXME: For a c-style function nested inside an objc implementation 1959 // class, there is no implementation context available, so we pass down 1960 // the context as argument to this routine. Ideally, this context need 1961 // be passed down in the AST node and somehow calculated from the AST 1962 // for a function decl. 1963 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 1964 if (ObjCImplementationDecl *IMPD = 1965 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 1966 ClassOfMethodDecl = IMPD->getClassInterface(); 1967 else if (ObjCCategoryImplDecl* CatImplClass = 1968 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 1969 ClassOfMethodDecl = CatImplClass->getClassInterface(); 1970 } 1971 1972 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 1973 if (ClassDeclared != IFTy->getDecl() || 1974 ClassOfMethodDecl != ClassDeclared) 1975 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 1976 } 1977 // @protected 1978 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 1979 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 1980 } 1981 1982 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 1983 MemberLoc, BaseExpr, 1984 OpKind == tok::arrow)); 1985 } 1986 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1987 << IFTy->getDecl()->getDeclName() << &Member 1988 << BaseExpr->getSourceRange()); 1989 } 1990 1991 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1992 // pointer to a (potentially qualified) interface type. 1993 const PointerType *PTy; 1994 const ObjCInterfaceType *IFTy; 1995 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1996 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1997 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1998 1999 // Search for a declared property first. 2000 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Context, 2001 &Member)) { 2002 // Check whether we can reference this property. 2003 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2004 return ExprError(); 2005 2006 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2007 MemberLoc, BaseExpr)); 2008 } 2009 2010 // Check protocols on qualified interfaces. 2011 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 2012 E = IFTy->qual_end(); I != E; ++I) 2013 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, 2014 &Member)) { 2015 // Check whether we can reference this property. 2016 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2017 return ExprError(); 2018 2019 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2020 MemberLoc, BaseExpr)); 2021 } 2022 2023 // If that failed, look for an "implicit" property by seeing if the nullary 2024 // selector is implemented. 2025 2026 // FIXME: The logic for looking up nullary and unary selectors should be 2027 // shared with the code in ActOnInstanceMessage. 2028 2029 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2030 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2031 2032 // If this reference is in an @implementation, check for 'private' methods. 2033 if (!Getter) 2034 Getter = FindMethodInNestedImplementations(IFace, Sel); 2035 2036 // Look through local category implementations associated with the class. 2037 if (!Getter) { 2038 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 2039 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2040 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Context, Sel); 2041 } 2042 } 2043 if (Getter) { 2044 // Check if we can reference this property. 2045 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2046 return ExprError(); 2047 } 2048 // If we found a getter then this may be a valid dot-reference, we 2049 // will look for the matching setter, in case it is needed. 2050 Selector SetterSel = 2051 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2052 PP.getSelectorTable(), &Member); 2053 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(Context, SetterSel); 2054 if (!Setter) { 2055 // If this reference is in an @implementation, also check for 'private' 2056 // methods. 2057 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2058 } 2059 // Look through local category implementations associated with the class. 2060 if (!Setter) { 2061 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2062 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2063 Setter = ObjCCategoryImpls[i]->getInstanceMethod(Context, SetterSel); 2064 } 2065 } 2066 2067 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2068 return ExprError(); 2069 2070 if (Getter || Setter) { 2071 QualType PType; 2072 2073 if (Getter) 2074 PType = Getter->getResultType(); 2075 else { 2076 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2077 E = Setter->param_end(); PI != E; ++PI) 2078 PType = (*PI)->getType(); 2079 } 2080 // FIXME: we must check that the setter has property type. 2081 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2082 Setter, MemberLoc, BaseExpr)); 2083 } 2084 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2085 << &Member << BaseType); 2086 } 2087 // Handle properties on qualified "id" protocols. 2088 const ObjCQualifiedIdType *QIdTy; 2089 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2090 // Check protocols on qualified interfaces. 2091 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2092 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2093 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2094 // Check the use of this declaration 2095 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2096 return ExprError(); 2097 2098 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2099 MemberLoc, BaseExpr)); 2100 } 2101 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2102 // Check the use of this method. 2103 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2104 return ExprError(); 2105 2106 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2107 OMD->getResultType(), 2108 OMD, OpLoc, MemberLoc, 2109 NULL, 0)); 2110 } 2111 } 2112 2113 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2114 << &Member << BaseType); 2115 } 2116 // Handle properties on ObjC 'Class' types. 2117 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2118 // Also must look for a getter name which uses property syntax. 2119 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2120 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2121 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2122 ObjCMethodDecl *Getter; 2123 // FIXME: need to also look locally in the implementation. 2124 if ((Getter = IFace->lookupClassMethod(Context, Sel))) { 2125 // Check the use of this method. 2126 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2127 return ExprError(); 2128 } 2129 // If we found a getter then this may be a valid dot-reference, we 2130 // will look for the matching setter, in case it is needed. 2131 Selector SetterSel = 2132 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2133 PP.getSelectorTable(), &Member); 2134 ObjCMethodDecl *Setter = IFace->lookupClassMethod(Context, SetterSel); 2135 if (!Setter) { 2136 // If this reference is in an @implementation, also check for 'private' 2137 // methods. 2138 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2139 } 2140 // Look through local category implementations associated with the class. 2141 if (!Setter) { 2142 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2143 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2144 Setter = ObjCCategoryImpls[i]->getClassMethod(Context, SetterSel); 2145 } 2146 } 2147 2148 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2149 return ExprError(); 2150 2151 if (Getter || Setter) { 2152 QualType PType; 2153 2154 if (Getter) 2155 PType = Getter->getResultType(); 2156 else { 2157 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2158 E = Setter->param_end(); PI != E; ++PI) 2159 PType = (*PI)->getType(); 2160 } 2161 // FIXME: we must check that the setter has property type. 2162 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2163 Setter, MemberLoc, BaseExpr)); 2164 } 2165 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2166 << &Member << BaseType); 2167 } 2168 } 2169 2170 // Handle 'field access' to vectors, such as 'V.xx'. 2171 if (BaseType->isExtVectorType()) { 2172 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2173 if (ret.isNull()) 2174 return ExprError(); 2175 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2176 MemberLoc)); 2177 } 2178 2179 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2180 << BaseType << BaseExpr->getSourceRange(); 2181 2182 // If the user is trying to apply -> or . to a function or function 2183 // pointer, it's probably because they forgot parentheses to call 2184 // the function. Suggest the addition of those parentheses. 2185 if (BaseType == Context.OverloadTy || 2186 BaseType->isFunctionType() || 2187 (BaseType->isPointerType() && 2188 BaseType->getAsPointerType()->isFunctionType())) { 2189 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2190 Diag(Loc, diag::note_member_reference_needs_call) 2191 << CodeModificationHint::CreateInsertion(Loc, "()"); 2192 } 2193 2194 return ExprError(); 2195} 2196 2197/// ConvertArgumentsForCall - Converts the arguments specified in 2198/// Args/NumArgs to the parameter types of the function FDecl with 2199/// function prototype Proto. Call is the call expression itself, and 2200/// Fn is the function expression. For a C++ member function, this 2201/// routine does not attempt to convert the object argument. Returns 2202/// true if the call is ill-formed. 2203bool 2204Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2205 FunctionDecl *FDecl, 2206 const FunctionProtoType *Proto, 2207 Expr **Args, unsigned NumArgs, 2208 SourceLocation RParenLoc) { 2209 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2210 // assignment, to the types of the corresponding parameter, ... 2211 unsigned NumArgsInProto = Proto->getNumArgs(); 2212 unsigned NumArgsToCheck = NumArgs; 2213 bool Invalid = false; 2214 2215 // If too few arguments are available (and we don't have default 2216 // arguments for the remaining parameters), don't make the call. 2217 if (NumArgs < NumArgsInProto) { 2218 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2219 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2220 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2221 // Use default arguments for missing arguments 2222 NumArgsToCheck = NumArgsInProto; 2223 Call->setNumArgs(Context, NumArgsInProto); 2224 } 2225 2226 // If too many are passed and not variadic, error on the extras and drop 2227 // them. 2228 if (NumArgs > NumArgsInProto) { 2229 if (!Proto->isVariadic()) { 2230 Diag(Args[NumArgsInProto]->getLocStart(), 2231 diag::err_typecheck_call_too_many_args) 2232 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2233 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2234 Args[NumArgs-1]->getLocEnd()); 2235 // This deletes the extra arguments. 2236 Call->setNumArgs(Context, NumArgsInProto); 2237 Invalid = true; 2238 } 2239 NumArgsToCheck = NumArgsInProto; 2240 } 2241 2242 // Continue to check argument types (even if we have too few/many args). 2243 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2244 QualType ProtoArgType = Proto->getArgType(i); 2245 2246 Expr *Arg; 2247 if (i < NumArgs) { 2248 Arg = Args[i]; 2249 2250 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2251 ProtoArgType, 2252 diag::err_call_incomplete_argument, 2253 Arg->getSourceRange())) 2254 return true; 2255 2256 // Pass the argument. 2257 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2258 return true; 2259 } else 2260 // We already type-checked the argument, so we know it works. 2261 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2262 QualType ArgType = Arg->getType(); 2263 2264 Call->setArg(i, Arg); 2265 } 2266 2267 // If this is a variadic call, handle args passed through "...". 2268 if (Proto->isVariadic()) { 2269 VariadicCallType CallType = VariadicFunction; 2270 if (Fn->getType()->isBlockPointerType()) 2271 CallType = VariadicBlock; // Block 2272 else if (isa<MemberExpr>(Fn)) 2273 CallType = VariadicMethod; 2274 2275 // Promote the arguments (C99 6.5.2.2p7). 2276 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2277 Expr *Arg = Args[i]; 2278 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2279 Call->setArg(i, Arg); 2280 } 2281 } 2282 2283 return Invalid; 2284} 2285 2286/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2287/// This provides the location of the left/right parens and a list of comma 2288/// locations. 2289Action::OwningExprResult 2290Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2291 MultiExprArg args, 2292 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2293 unsigned NumArgs = args.size(); 2294 Expr *Fn = static_cast<Expr *>(fn.release()); 2295 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2296 assert(Fn && "no function call expression"); 2297 FunctionDecl *FDecl = NULL; 2298 DeclarationName UnqualifiedName; 2299 2300 if (getLangOptions().CPlusPlus) { 2301 // Determine whether this is a dependent call inside a C++ template, 2302 // in which case we won't do any semantic analysis now. 2303 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 2304 bool Dependent = false; 2305 if (Fn->isTypeDependent()) 2306 Dependent = true; 2307 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2308 Dependent = true; 2309 2310 if (Dependent) 2311 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2312 Context.DependentTy, RParenLoc)); 2313 2314 // Determine whether this is a call to an object (C++ [over.call.object]). 2315 if (Fn->getType()->isRecordType()) 2316 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2317 CommaLocs, RParenLoc)); 2318 2319 // Determine whether this is a call to a member function. 2320 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2321 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2322 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2323 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2324 CommaLocs, RParenLoc)); 2325 } 2326 2327 // If we're directly calling a function, get the appropriate declaration. 2328 DeclRefExpr *DRExpr = NULL; 2329 Expr *FnExpr = Fn; 2330 bool ADL = true; 2331 while (true) { 2332 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2333 FnExpr = IcExpr->getSubExpr(); 2334 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2335 // Parentheses around a function disable ADL 2336 // (C++0x [basic.lookup.argdep]p1). 2337 ADL = false; 2338 FnExpr = PExpr->getSubExpr(); 2339 } else if (isa<UnaryOperator>(FnExpr) && 2340 cast<UnaryOperator>(FnExpr)->getOpcode() 2341 == UnaryOperator::AddrOf) { 2342 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2343 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2344 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2345 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2346 break; 2347 } else if (UnresolvedFunctionNameExpr *DepName 2348 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2349 UnqualifiedName = DepName->getName(); 2350 break; 2351 } else { 2352 // Any kind of name that does not refer to a declaration (or 2353 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2354 ADL = false; 2355 break; 2356 } 2357 } 2358 2359 OverloadedFunctionDecl *Ovl = 0; 2360 if (DRExpr) { 2361 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2362 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2363 } 2364 2365 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2366 // We don't perform ADL for implicit declarations of builtins. 2367 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2368 ADL = false; 2369 2370 // We don't perform ADL in C. 2371 if (!getLangOptions().CPlusPlus) 2372 ADL = false; 2373 2374 if (Ovl || ADL) { 2375 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2376 UnqualifiedName, LParenLoc, Args, 2377 NumArgs, CommaLocs, RParenLoc, ADL); 2378 if (!FDecl) 2379 return ExprError(); 2380 2381 // Update Fn to refer to the actual function selected. 2382 Expr *NewFn = 0; 2383 if (QualifiedDeclRefExpr *QDRExpr 2384 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2385 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2386 QDRExpr->getLocation(), 2387 false, false, 2388 QDRExpr->getQualifierRange(), 2389 QDRExpr->getQualifier()); 2390 else 2391 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2392 Fn->getSourceRange().getBegin()); 2393 Fn->Destroy(Context); 2394 Fn = NewFn; 2395 } 2396 } 2397 2398 // Promote the function operand. 2399 UsualUnaryConversions(Fn); 2400 2401 // Make the call expr early, before semantic checks. This guarantees cleanup 2402 // of arguments and function on error. 2403 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2404 Args, NumArgs, 2405 Context.BoolTy, 2406 RParenLoc)); 2407 2408 const FunctionType *FuncT; 2409 if (!Fn->getType()->isBlockPointerType()) { 2410 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2411 // have type pointer to function". 2412 const PointerType *PT = Fn->getType()->getAsPointerType(); 2413 if (PT == 0) 2414 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2415 << Fn->getType() << Fn->getSourceRange()); 2416 FuncT = PT->getPointeeType()->getAsFunctionType(); 2417 } else { // This is a block call. 2418 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2419 getAsFunctionType(); 2420 } 2421 if (FuncT == 0) 2422 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2423 << Fn->getType() << Fn->getSourceRange()); 2424 2425 // Check for a valid return type 2426 if (!FuncT->getResultType()->isVoidType() && 2427 RequireCompleteType(Fn->getSourceRange().getBegin(), 2428 FuncT->getResultType(), 2429 diag::err_call_incomplete_return, 2430 TheCall->getSourceRange())) 2431 return ExprError(); 2432 2433 // We know the result type of the call, set it. 2434 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2435 2436 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2437 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2438 RParenLoc)) 2439 return ExprError(); 2440 } else { 2441 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2442 2443 if (FDecl) { 2444 // Check if we have too few/too many template arguments, based 2445 // on our knowledge of the function definition. 2446 const FunctionDecl *Def = 0; 2447 if (FDecl->getBody(Context, Def) && NumArgs != Def->param_size()) 2448 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2449 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2450 } 2451 2452 // Promote the arguments (C99 6.5.2.2p6). 2453 for (unsigned i = 0; i != NumArgs; i++) { 2454 Expr *Arg = Args[i]; 2455 DefaultArgumentPromotion(Arg); 2456 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2457 Arg->getType(), 2458 diag::err_call_incomplete_argument, 2459 Arg->getSourceRange())) 2460 return ExprError(); 2461 TheCall->setArg(i, Arg); 2462 } 2463 } 2464 2465 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2466 if (!Method->isStatic()) 2467 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2468 << Fn->getSourceRange()); 2469 2470 // Do special checking on direct calls to functions. 2471 if (FDecl) 2472 return CheckFunctionCall(FDecl, TheCall.take()); 2473 2474 return Owned(TheCall.take()); 2475} 2476 2477Action::OwningExprResult 2478Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2479 SourceLocation RParenLoc, ExprArg InitExpr) { 2480 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2481 QualType literalType = QualType::getFromOpaquePtr(Ty); 2482 // FIXME: put back this assert when initializers are worked out. 2483 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2484 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2485 2486 if (literalType->isArrayType()) { 2487 if (literalType->isVariableArrayType()) 2488 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2489 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2490 } else if (RequireCompleteType(LParenLoc, literalType, 2491 diag::err_typecheck_decl_incomplete_type, 2492 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2493 return ExprError(); 2494 2495 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2496 DeclarationName(), /*FIXME:DirectInit=*/false)) 2497 return ExprError(); 2498 2499 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2500 if (isFileScope) { // 6.5.2.5p3 2501 if (CheckForConstantInitializer(literalExpr, literalType)) 2502 return ExprError(); 2503 } 2504 InitExpr.release(); 2505 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2506 literalExpr, isFileScope)); 2507} 2508 2509Action::OwningExprResult 2510Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2511 SourceLocation RBraceLoc) { 2512 unsigned NumInit = initlist.size(); 2513 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2514 2515 // Semantic analysis for initializers is done by ActOnDeclarator() and 2516 // CheckInitializer() - it requires knowledge of the object being intialized. 2517 2518 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2519 RBraceLoc); 2520 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2521 return Owned(E); 2522} 2523 2524/// CheckCastTypes - Check type constraints for casting between types. 2525bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2526 UsualUnaryConversions(castExpr); 2527 2528 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2529 // type needs to be scalar. 2530 if (castType->isVoidType()) { 2531 // Cast to void allows any expr type. 2532 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2533 // We can't check any more until template instantiation time. 2534 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2535 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2536 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2537 (castType->isStructureType() || castType->isUnionType())) { 2538 // GCC struct/union extension: allow cast to self. 2539 // FIXME: Check that the cast destination type is complete. 2540 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2541 << castType << castExpr->getSourceRange(); 2542 } else if (castType->isUnionType()) { 2543 // GCC cast to union extension 2544 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2545 RecordDecl::field_iterator Field, FieldEnd; 2546 for (Field = RD->field_begin(Context), FieldEnd = RD->field_end(Context); 2547 Field != FieldEnd; ++Field) { 2548 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2549 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2550 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2551 << castExpr->getSourceRange(); 2552 break; 2553 } 2554 } 2555 if (Field == FieldEnd) 2556 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2557 << castExpr->getType() << castExpr->getSourceRange(); 2558 } else { 2559 // Reject any other conversions to non-scalar types. 2560 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2561 << castType << castExpr->getSourceRange(); 2562 } 2563 } else if (!castExpr->getType()->isScalarType() && 2564 !castExpr->getType()->isVectorType()) { 2565 return Diag(castExpr->getLocStart(), 2566 diag::err_typecheck_expect_scalar_operand) 2567 << castExpr->getType() << castExpr->getSourceRange(); 2568 } else if (castExpr->getType()->isVectorType()) { 2569 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2570 return true; 2571 } else if (castType->isVectorType()) { 2572 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2573 return true; 2574 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2575 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2576 } 2577 return false; 2578} 2579 2580bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2581 assert(VectorTy->isVectorType() && "Not a vector type!"); 2582 2583 if (Ty->isVectorType() || Ty->isIntegerType()) { 2584 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2585 return Diag(R.getBegin(), 2586 Ty->isVectorType() ? 2587 diag::err_invalid_conversion_between_vectors : 2588 diag::err_invalid_conversion_between_vector_and_integer) 2589 << VectorTy << Ty << R; 2590 } else 2591 return Diag(R.getBegin(), 2592 diag::err_invalid_conversion_between_vector_and_scalar) 2593 << VectorTy << Ty << R; 2594 2595 return false; 2596} 2597 2598Action::OwningExprResult 2599Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2600 SourceLocation RParenLoc, ExprArg Op) { 2601 assert((Ty != 0) && (Op.get() != 0) && 2602 "ActOnCastExpr(): missing type or expr"); 2603 2604 Expr *castExpr = static_cast<Expr*>(Op.release()); 2605 QualType castType = QualType::getFromOpaquePtr(Ty); 2606 2607 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2608 return ExprError(); 2609 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2610 LParenLoc, RParenLoc)); 2611} 2612 2613/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2614/// In that case, lhs = cond. 2615/// C99 6.5.15 2616QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2617 SourceLocation QuestionLoc) { 2618 // C++ is sufficiently different to merit its own checker. 2619 if (getLangOptions().CPlusPlus) 2620 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 2621 2622 UsualUnaryConversions(Cond); 2623 UsualUnaryConversions(LHS); 2624 UsualUnaryConversions(RHS); 2625 QualType CondTy = Cond->getType(); 2626 QualType LHSTy = LHS->getType(); 2627 QualType RHSTy = RHS->getType(); 2628 2629 // first, check the condition. 2630 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2631 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2632 << CondTy; 2633 return QualType(); 2634 } 2635 2636 // Now check the two expressions. 2637 2638 // If both operands have arithmetic type, do the usual arithmetic conversions 2639 // to find a common type: C99 6.5.15p3,5. 2640 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2641 UsualArithmeticConversions(LHS, RHS); 2642 return LHS->getType(); 2643 } 2644 2645 // If both operands are the same structure or union type, the result is that 2646 // type. 2647 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2648 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2649 if (LHSRT->getDecl() == RHSRT->getDecl()) 2650 // "If both the operands have structure or union type, the result has 2651 // that type." This implies that CV qualifiers are dropped. 2652 return LHSTy.getUnqualifiedType(); 2653 // FIXME: Type of conditional expression must be complete in C mode. 2654 } 2655 2656 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2657 // The following || allows only one side to be void (a GCC-ism). 2658 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2659 if (!LHSTy->isVoidType()) 2660 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2661 << RHS->getSourceRange(); 2662 if (!RHSTy->isVoidType()) 2663 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2664 << LHS->getSourceRange(); 2665 ImpCastExprToType(LHS, Context.VoidTy); 2666 ImpCastExprToType(RHS, Context.VoidTy); 2667 return Context.VoidTy; 2668 } 2669 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2670 // the type of the other operand." 2671 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2672 Context.isObjCObjectPointerType(LHSTy)) && 2673 RHS->isNullPointerConstant(Context)) { 2674 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2675 return LHSTy; 2676 } 2677 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2678 Context.isObjCObjectPointerType(RHSTy)) && 2679 LHS->isNullPointerConstant(Context)) { 2680 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2681 return RHSTy; 2682 } 2683 2684 // Handle the case where both operands are pointers before we handle null 2685 // pointer constants in case both operands are null pointer constants. 2686 if (const PointerType *LHSPT = LHSTy->getAsPointerType()) { // C99 6.5.15p3,6 2687 if (const PointerType *RHSPT = RHSTy->getAsPointerType()) { 2688 // get the "pointed to" types 2689 QualType lhptee = LHSPT->getPointeeType(); 2690 QualType rhptee = RHSPT->getPointeeType(); 2691 2692 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2693 if (lhptee->isVoidType() && 2694 rhptee->isIncompleteOrObjectType()) { 2695 // Figure out necessary qualifiers (C99 6.5.15p6) 2696 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2697 QualType destType = Context.getPointerType(destPointee); 2698 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2699 ImpCastExprToType(RHS, destType); // promote to void* 2700 return destType; 2701 } 2702 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2703 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2704 QualType destType = Context.getPointerType(destPointee); 2705 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2706 ImpCastExprToType(RHS, destType); // promote to void* 2707 return destType; 2708 } 2709 2710 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2711 // Two identical pointer types are always compatible. 2712 return LHSTy; 2713 } 2714 2715 QualType compositeType = LHSTy; 2716 2717 // If either type is an Objective-C object type then check 2718 // compatibility according to Objective-C. 2719 if (Context.isObjCObjectPointerType(LHSTy) || 2720 Context.isObjCObjectPointerType(RHSTy)) { 2721 // If both operands are interfaces and either operand can be 2722 // assigned to the other, use that type as the composite 2723 // type. This allows 2724 // xxx ? (A*) a : (B*) b 2725 // where B is a subclass of A. 2726 // 2727 // Additionally, as for assignment, if either type is 'id' 2728 // allow silent coercion. Finally, if the types are 2729 // incompatible then make sure to use 'id' as the composite 2730 // type so the result is acceptable for sending messages to. 2731 2732 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2733 // It could return the composite type. 2734 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2735 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2736 if (LHSIface && RHSIface && 2737 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2738 compositeType = LHSTy; 2739 } else if (LHSIface && RHSIface && 2740 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2741 compositeType = RHSTy; 2742 } else if (Context.isObjCIdStructType(lhptee) || 2743 Context.isObjCIdStructType(rhptee)) { 2744 compositeType = Context.getObjCIdType(); 2745 } else { 2746 Diag(QuestionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2747 << LHSTy << RHSTy 2748 << LHS->getSourceRange() << RHS->getSourceRange(); 2749 QualType incompatTy = Context.getObjCIdType(); 2750 ImpCastExprToType(LHS, incompatTy); 2751 ImpCastExprToType(RHS, incompatTy); 2752 return incompatTy; 2753 } 2754 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2755 rhptee.getUnqualifiedType())) { 2756 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2757 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2758 // In this situation, we assume void* type. No especially good 2759 // reason, but this is what gcc does, and we do have to pick 2760 // to get a consistent AST. 2761 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2762 ImpCastExprToType(LHS, incompatTy); 2763 ImpCastExprToType(RHS, incompatTy); 2764 return incompatTy; 2765 } 2766 // The pointer types are compatible. 2767 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2768 // differently qualified versions of compatible types, the result type is 2769 // a pointer to an appropriately qualified version of the *composite* 2770 // type. 2771 // FIXME: Need to calculate the composite type. 2772 // FIXME: Need to add qualifiers 2773 ImpCastExprToType(LHS, compositeType); 2774 ImpCastExprToType(RHS, compositeType); 2775 return compositeType; 2776 } 2777 } 2778 2779 // GCC compatibility: soften pointer/integer mismatch. 2780 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 2781 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 2782 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2783 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 2784 return RHSTy; 2785 } 2786 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 2787 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 2788 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2789 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 2790 return LHSTy; 2791 } 2792 2793 // Selection between block pointer types is ok as long as they are the same. 2794 if (LHSTy->isBlockPointerType() && RHSTy->isBlockPointerType() && 2795 Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) 2796 return LHSTy; 2797 2798 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2799 // evaluates to "struct objc_object *" (and is handled above when comparing 2800 // id with statically typed objects). 2801 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 2802 // GCC allows qualified id and any Objective-C type to devolve to 2803 // id. Currently localizing to here until clear this should be 2804 // part of ObjCQualifiedIdTypesAreCompatible. 2805 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 2806 (LHSTy->isObjCQualifiedIdType() && 2807 Context.isObjCObjectPointerType(RHSTy)) || 2808 (RHSTy->isObjCQualifiedIdType() && 2809 Context.isObjCObjectPointerType(LHSTy))) { 2810 // FIXME: This is not the correct composite type. This only 2811 // happens to work because id can more or less be used anywhere, 2812 // however this may change the type of method sends. 2813 // FIXME: gcc adds some type-checking of the arguments and emits 2814 // (confusing) incompatible comparison warnings in some 2815 // cases. Investigate. 2816 QualType compositeType = Context.getObjCIdType(); 2817 ImpCastExprToType(LHS, compositeType); 2818 ImpCastExprToType(RHS, compositeType); 2819 return compositeType; 2820 } 2821 } 2822 2823 // Otherwise, the operands are not compatible. 2824 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2825 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2826 return QualType(); 2827} 2828 2829/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2830/// in the case of a the GNU conditional expr extension. 2831Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2832 SourceLocation ColonLoc, 2833 ExprArg Cond, ExprArg LHS, 2834 ExprArg RHS) { 2835 Expr *CondExpr = (Expr *) Cond.get(); 2836 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2837 2838 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2839 // was the condition. 2840 bool isLHSNull = LHSExpr == 0; 2841 if (isLHSNull) 2842 LHSExpr = CondExpr; 2843 2844 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2845 RHSExpr, QuestionLoc); 2846 if (result.isNull()) 2847 return ExprError(); 2848 2849 Cond.release(); 2850 LHS.release(); 2851 RHS.release(); 2852 return Owned(new (Context) ConditionalOperator(CondExpr, 2853 isLHSNull ? 0 : LHSExpr, 2854 RHSExpr, result)); 2855} 2856 2857 2858// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2859// being closely modeled after the C99 spec:-). The odd characteristic of this 2860// routine is it effectively iqnores the qualifiers on the top level pointee. 2861// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2862// FIXME: add a couple examples in this comment. 2863Sema::AssignConvertType 2864Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2865 QualType lhptee, rhptee; 2866 2867 // get the "pointed to" type (ignoring qualifiers at the top level) 2868 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2869 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2870 2871 // make sure we operate on the canonical type 2872 lhptee = Context.getCanonicalType(lhptee); 2873 rhptee = Context.getCanonicalType(rhptee); 2874 2875 AssignConvertType ConvTy = Compatible; 2876 2877 // C99 6.5.16.1p1: This following citation is common to constraints 2878 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2879 // qualifiers of the type *pointed to* by the right; 2880 // FIXME: Handle ExtQualType 2881 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2882 ConvTy = CompatiblePointerDiscardsQualifiers; 2883 2884 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2885 // incomplete type and the other is a pointer to a qualified or unqualified 2886 // version of void... 2887 if (lhptee->isVoidType()) { 2888 if (rhptee->isIncompleteOrObjectType()) 2889 return ConvTy; 2890 2891 // As an extension, we allow cast to/from void* to function pointer. 2892 assert(rhptee->isFunctionType()); 2893 return FunctionVoidPointer; 2894 } 2895 2896 if (rhptee->isVoidType()) { 2897 if (lhptee->isIncompleteOrObjectType()) 2898 return ConvTy; 2899 2900 // As an extension, we allow cast to/from void* to function pointer. 2901 assert(lhptee->isFunctionType()); 2902 return FunctionVoidPointer; 2903 } 2904 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2905 // unqualified versions of compatible types, ... 2906 lhptee = lhptee.getUnqualifiedType(); 2907 rhptee = rhptee.getUnqualifiedType(); 2908 if (!Context.typesAreCompatible(lhptee, rhptee)) { 2909 // Check if the pointee types are compatible ignoring the sign. 2910 // We explicitly check for char so that we catch "char" vs 2911 // "unsigned char" on systems where "char" is unsigned. 2912 if (lhptee->isCharType()) { 2913 lhptee = Context.UnsignedCharTy; 2914 } else if (lhptee->isSignedIntegerType()) { 2915 lhptee = Context.getCorrespondingUnsignedType(lhptee); 2916 } 2917 if (rhptee->isCharType()) { 2918 rhptee = Context.UnsignedCharTy; 2919 } else if (rhptee->isSignedIntegerType()) { 2920 rhptee = Context.getCorrespondingUnsignedType(rhptee); 2921 } 2922 if (lhptee == rhptee) { 2923 // Types are compatible ignoring the sign. Qualifier incompatibility 2924 // takes priority over sign incompatibility because the sign 2925 // warning can be disabled. 2926 if (ConvTy != Compatible) 2927 return ConvTy; 2928 return IncompatiblePointerSign; 2929 } 2930 // General pointer incompatibility takes priority over qualifiers. 2931 return IncompatiblePointer; 2932 } 2933 return ConvTy; 2934} 2935 2936/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2937/// block pointer types are compatible or whether a block and normal pointer 2938/// are compatible. It is more restrict than comparing two function pointer 2939// types. 2940Sema::AssignConvertType 2941Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2942 QualType rhsType) { 2943 QualType lhptee, rhptee; 2944 2945 // get the "pointed to" type (ignoring qualifiers at the top level) 2946 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2947 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2948 2949 // make sure we operate on the canonical type 2950 lhptee = Context.getCanonicalType(lhptee); 2951 rhptee = Context.getCanonicalType(rhptee); 2952 2953 AssignConvertType ConvTy = Compatible; 2954 2955 // For blocks we enforce that qualifiers are identical. 2956 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2957 ConvTy = CompatiblePointerDiscardsQualifiers; 2958 2959 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2960 return IncompatibleBlockPointer; 2961 return ConvTy; 2962} 2963 2964/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2965/// has code to accommodate several GCC extensions when type checking 2966/// pointers. Here are some objectionable examples that GCC considers warnings: 2967/// 2968/// int a, *pint; 2969/// short *pshort; 2970/// struct foo *pfoo; 2971/// 2972/// pint = pshort; // warning: assignment from incompatible pointer type 2973/// a = pint; // warning: assignment makes integer from pointer without a cast 2974/// pint = a; // warning: assignment makes pointer from integer without a cast 2975/// pint = pfoo; // warning: assignment from incompatible pointer type 2976/// 2977/// As a result, the code for dealing with pointers is more complex than the 2978/// C99 spec dictates. 2979/// 2980Sema::AssignConvertType 2981Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2982 // Get canonical types. We're not formatting these types, just comparing 2983 // them. 2984 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2985 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2986 2987 if (lhsType == rhsType) 2988 return Compatible; // Common case: fast path an exact match. 2989 2990 // If the left-hand side is a reference type, then we are in a 2991 // (rare!) case where we've allowed the use of references in C, 2992 // e.g., as a parameter type in a built-in function. In this case, 2993 // just make sure that the type referenced is compatible with the 2994 // right-hand side type. The caller is responsible for adjusting 2995 // lhsType so that the resulting expression does not have reference 2996 // type. 2997 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2998 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2999 return Compatible; 3000 return Incompatible; 3001 } 3002 3003 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 3004 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 3005 return Compatible; 3006 // Relax integer conversions like we do for pointers below. 3007 if (rhsType->isIntegerType()) 3008 return IntToPointer; 3009 if (lhsType->isIntegerType()) 3010 return PointerToInt; 3011 return IncompatibleObjCQualifiedId; 3012 } 3013 3014 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3015 // For ExtVector, allow vector splats; float -> <n x float> 3016 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 3017 if (LV->getElementType() == rhsType) 3018 return Compatible; 3019 3020 // If we are allowing lax vector conversions, and LHS and RHS are both 3021 // vectors, the total size only needs to be the same. This is a bitcast; 3022 // no bits are changed but the result type is different. 3023 if (getLangOptions().LaxVectorConversions && 3024 lhsType->isVectorType() && rhsType->isVectorType()) { 3025 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3026 return IncompatibleVectors; 3027 } 3028 return Incompatible; 3029 } 3030 3031 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3032 return Compatible; 3033 3034 if (isa<PointerType>(lhsType)) { 3035 if (rhsType->isIntegerType()) 3036 return IntToPointer; 3037 3038 if (isa<PointerType>(rhsType)) 3039 return CheckPointerTypesForAssignment(lhsType, rhsType); 3040 3041 if (rhsType->getAsBlockPointerType()) { 3042 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3043 return Compatible; 3044 3045 // Treat block pointers as objects. 3046 if (getLangOptions().ObjC1 && 3047 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 3048 return Compatible; 3049 } 3050 return Incompatible; 3051 } 3052 3053 if (isa<BlockPointerType>(lhsType)) { 3054 if (rhsType->isIntegerType()) 3055 return IntToBlockPointer; 3056 3057 // Treat block pointers as objects. 3058 if (getLangOptions().ObjC1 && 3059 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 3060 return Compatible; 3061 3062 if (rhsType->isBlockPointerType()) 3063 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3064 3065 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3066 if (RHSPT->getPointeeType()->isVoidType()) 3067 return Compatible; 3068 } 3069 return Incompatible; 3070 } 3071 3072 if (isa<PointerType>(rhsType)) { 3073 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3074 if (lhsType == Context.BoolTy) 3075 return Compatible; 3076 3077 if (lhsType->isIntegerType()) 3078 return PointerToInt; 3079 3080 if (isa<PointerType>(lhsType)) 3081 return CheckPointerTypesForAssignment(lhsType, rhsType); 3082 3083 if (isa<BlockPointerType>(lhsType) && 3084 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3085 return Compatible; 3086 return Incompatible; 3087 } 3088 3089 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3090 if (Context.typesAreCompatible(lhsType, rhsType)) 3091 return Compatible; 3092 } 3093 return Incompatible; 3094} 3095 3096Sema::AssignConvertType 3097Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3098 if (getLangOptions().CPlusPlus) { 3099 if (!lhsType->isRecordType()) { 3100 // C++ 5.17p3: If the left operand is not of class type, the 3101 // expression is implicitly converted (C++ 4) to the 3102 // cv-unqualified type of the left operand. 3103 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3104 "assigning")) 3105 return Incompatible; 3106 return Compatible; 3107 } 3108 3109 // FIXME: Currently, we fall through and treat C++ classes like C 3110 // structures. 3111 } 3112 3113 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3114 // a null pointer constant. 3115 if ((lhsType->isPointerType() || 3116 lhsType->isObjCQualifiedIdType() || 3117 lhsType->isBlockPointerType()) 3118 && rExpr->isNullPointerConstant(Context)) { 3119 ImpCastExprToType(rExpr, lhsType); 3120 return Compatible; 3121 } 3122 3123 // This check seems unnatural, however it is necessary to ensure the proper 3124 // conversion of functions/arrays. If the conversion were done for all 3125 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3126 // expressions that surpress this implicit conversion (&, sizeof). 3127 // 3128 // Suppress this for references: C++ 8.5.3p5. 3129 if (!lhsType->isReferenceType()) 3130 DefaultFunctionArrayConversion(rExpr); 3131 3132 Sema::AssignConvertType result = 3133 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3134 3135 // C99 6.5.16.1p2: The value of the right operand is converted to the 3136 // type of the assignment expression. 3137 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3138 // so that we can use references in built-in functions even in C. 3139 // The getNonReferenceType() call makes sure that the resulting expression 3140 // does not have reference type. 3141 if (rExpr->getType() != lhsType) 3142 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3143 return result; 3144} 3145 3146Sema::AssignConvertType 3147Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 3148 return CheckAssignmentConstraints(lhsType, rhsType); 3149} 3150 3151QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3152 Diag(Loc, diag::err_typecheck_invalid_operands) 3153 << lex->getType() << rex->getType() 3154 << lex->getSourceRange() << rex->getSourceRange(); 3155 return QualType(); 3156} 3157 3158inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3159 Expr *&rex) { 3160 // For conversion purposes, we ignore any qualifiers. 3161 // For example, "const float" and "float" are equivalent. 3162 QualType lhsType = 3163 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3164 QualType rhsType = 3165 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3166 3167 // If the vector types are identical, return. 3168 if (lhsType == rhsType) 3169 return lhsType; 3170 3171 // Handle the case of a vector & extvector type of the same size and element 3172 // type. It would be nice if we only had one vector type someday. 3173 if (getLangOptions().LaxVectorConversions) { 3174 // FIXME: Should we warn here? 3175 if (const VectorType *LV = lhsType->getAsVectorType()) { 3176 if (const VectorType *RV = rhsType->getAsVectorType()) 3177 if (LV->getElementType() == RV->getElementType() && 3178 LV->getNumElements() == RV->getNumElements()) { 3179 return lhsType->isExtVectorType() ? lhsType : rhsType; 3180 } 3181 } 3182 } 3183 3184 // If the lhs is an extended vector and the rhs is a scalar of the same type 3185 // or a literal, promote the rhs to the vector type. 3186 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3187 QualType eltType = V->getElementType(); 3188 3189 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3190 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3191 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3192 ImpCastExprToType(rex, lhsType); 3193 return lhsType; 3194 } 3195 } 3196 3197 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3198 // promote the lhs to the vector type. 3199 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3200 QualType eltType = V->getElementType(); 3201 3202 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3203 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3204 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3205 ImpCastExprToType(lex, rhsType); 3206 return rhsType; 3207 } 3208 } 3209 3210 // You cannot convert between vector values of different size. 3211 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3212 << lex->getType() << rex->getType() 3213 << lex->getSourceRange() << rex->getSourceRange(); 3214 return QualType(); 3215} 3216 3217inline QualType Sema::CheckMultiplyDivideOperands( 3218 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3219{ 3220 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3221 return CheckVectorOperands(Loc, lex, rex); 3222 3223 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3224 3225 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3226 return compType; 3227 return InvalidOperands(Loc, lex, rex); 3228} 3229 3230inline QualType Sema::CheckRemainderOperands( 3231 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3232{ 3233 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3234 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3235 return CheckVectorOperands(Loc, lex, rex); 3236 return InvalidOperands(Loc, lex, rex); 3237 } 3238 3239 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3240 3241 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3242 return compType; 3243 return InvalidOperands(Loc, lex, rex); 3244} 3245 3246inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3247 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3248{ 3249 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3250 QualType compType = CheckVectorOperands(Loc, lex, rex); 3251 if (CompLHSTy) *CompLHSTy = compType; 3252 return compType; 3253 } 3254 3255 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3256 3257 // handle the common case first (both operands are arithmetic). 3258 if (lex->getType()->isArithmeticType() && 3259 rex->getType()->isArithmeticType()) { 3260 if (CompLHSTy) *CompLHSTy = compType; 3261 return compType; 3262 } 3263 3264 // Put any potential pointer into PExp 3265 Expr* PExp = lex, *IExp = rex; 3266 if (IExp->getType()->isPointerType()) 3267 std::swap(PExp, IExp); 3268 3269 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 3270 if (IExp->getType()->isIntegerType()) { 3271 // Check for arithmetic on pointers to incomplete types 3272 if (PTy->getPointeeType()->isVoidType()) { 3273 if (getLangOptions().CPlusPlus) { 3274 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3275 << lex->getSourceRange() << rex->getSourceRange(); 3276 return QualType(); 3277 } 3278 3279 // GNU extension: arithmetic on pointer to void 3280 Diag(Loc, diag::ext_gnu_void_ptr) 3281 << lex->getSourceRange() << rex->getSourceRange(); 3282 } else if (PTy->getPointeeType()->isFunctionType()) { 3283 if (getLangOptions().CPlusPlus) { 3284 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3285 << lex->getType() << lex->getSourceRange(); 3286 return QualType(); 3287 } 3288 3289 // GNU extension: arithmetic on pointer to function 3290 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3291 << lex->getType() << lex->getSourceRange(); 3292 } else if (!PTy->isDependentType() && 3293 RequireCompleteType(Loc, PTy->getPointeeType(), 3294 diag::err_typecheck_arithmetic_incomplete_type, 3295 lex->getSourceRange(), SourceRange(), 3296 lex->getType())) 3297 return QualType(); 3298 3299 if (CompLHSTy) { 3300 QualType LHSTy = lex->getType(); 3301 if (LHSTy->isPromotableIntegerType()) 3302 LHSTy = Context.IntTy; 3303 *CompLHSTy = LHSTy; 3304 } 3305 return PExp->getType(); 3306 } 3307 } 3308 3309 return InvalidOperands(Loc, lex, rex); 3310} 3311 3312// C99 6.5.6 3313QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3314 SourceLocation Loc, QualType* CompLHSTy) { 3315 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3316 QualType compType = CheckVectorOperands(Loc, lex, rex); 3317 if (CompLHSTy) *CompLHSTy = compType; 3318 return compType; 3319 } 3320 3321 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3322 3323 // Enforce type constraints: C99 6.5.6p3. 3324 3325 // Handle the common case first (both operands are arithmetic). 3326 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) { 3327 if (CompLHSTy) *CompLHSTy = compType; 3328 return compType; 3329 } 3330 3331 // Either ptr - int or ptr - ptr. 3332 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3333 QualType lpointee = LHSPTy->getPointeeType(); 3334 3335 // The LHS must be an completely-defined object type. 3336 3337 bool ComplainAboutVoid = false; 3338 Expr *ComplainAboutFunc = 0; 3339 if (lpointee->isVoidType()) { 3340 if (getLangOptions().CPlusPlus) { 3341 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3342 << lex->getSourceRange() << rex->getSourceRange(); 3343 return QualType(); 3344 } 3345 3346 // GNU C extension: arithmetic on pointer to void 3347 ComplainAboutVoid = true; 3348 } else if (lpointee->isFunctionType()) { 3349 if (getLangOptions().CPlusPlus) { 3350 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3351 << lex->getType() << lex->getSourceRange(); 3352 return QualType(); 3353 } 3354 3355 // GNU C extension: arithmetic on pointer to function 3356 ComplainAboutFunc = lex; 3357 } else if (!lpointee->isDependentType() && 3358 RequireCompleteType(Loc, lpointee, 3359 diag::err_typecheck_sub_ptr_object, 3360 lex->getSourceRange(), 3361 SourceRange(), 3362 lex->getType())) 3363 return QualType(); 3364 3365 // The result type of a pointer-int computation is the pointer type. 3366 if (rex->getType()->isIntegerType()) { 3367 if (ComplainAboutVoid) 3368 Diag(Loc, diag::ext_gnu_void_ptr) 3369 << lex->getSourceRange() << rex->getSourceRange(); 3370 if (ComplainAboutFunc) 3371 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3372 << ComplainAboutFunc->getType() 3373 << ComplainAboutFunc->getSourceRange(); 3374 3375 if (CompLHSTy) *CompLHSTy = lex->getType(); 3376 return lex->getType(); 3377 } 3378 3379 // Handle pointer-pointer subtractions. 3380 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3381 QualType rpointee = RHSPTy->getPointeeType(); 3382 3383 // RHS must be a completely-type object type. 3384 // Handle the GNU void* extension. 3385 if (rpointee->isVoidType()) { 3386 if (getLangOptions().CPlusPlus) { 3387 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3388 << lex->getSourceRange() << rex->getSourceRange(); 3389 return QualType(); 3390 } 3391 3392 ComplainAboutVoid = true; 3393 } else if (rpointee->isFunctionType()) { 3394 if (getLangOptions().CPlusPlus) { 3395 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3396 << rex->getType() << rex->getSourceRange(); 3397 return QualType(); 3398 } 3399 3400 // GNU extension: arithmetic on pointer to function 3401 if (!ComplainAboutFunc) 3402 ComplainAboutFunc = rex; 3403 } else if (!rpointee->isDependentType() && 3404 RequireCompleteType(Loc, rpointee, 3405 diag::err_typecheck_sub_ptr_object, 3406 rex->getSourceRange(), 3407 SourceRange(), 3408 rex->getType())) 3409 return QualType(); 3410 3411 // Pointee types must be compatible. 3412 if (!Context.typesAreCompatible( 3413 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3414 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3415 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3416 << lex->getType() << rex->getType() 3417 << lex->getSourceRange() << rex->getSourceRange(); 3418 return QualType(); 3419 } 3420 3421 if (ComplainAboutVoid) 3422 Diag(Loc, diag::ext_gnu_void_ptr) 3423 << lex->getSourceRange() << rex->getSourceRange(); 3424 if (ComplainAboutFunc) 3425 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3426 << ComplainAboutFunc->getType() 3427 << ComplainAboutFunc->getSourceRange(); 3428 3429 if (CompLHSTy) *CompLHSTy = lex->getType(); 3430 return Context.getPointerDiffType(); 3431 } 3432 } 3433 3434 return InvalidOperands(Loc, lex, rex); 3435} 3436 3437// C99 6.5.7 3438QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3439 bool isCompAssign) { 3440 // C99 6.5.7p2: Each of the operands shall have integer type. 3441 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3442 return InvalidOperands(Loc, lex, rex); 3443 3444 // Shifts don't perform usual arithmetic conversions, they just do integer 3445 // promotions on each operand. C99 6.5.7p3 3446 QualType LHSTy; 3447 if (lex->getType()->isPromotableIntegerType()) 3448 LHSTy = Context.IntTy; 3449 else 3450 LHSTy = lex->getType(); 3451 if (!isCompAssign) 3452 ImpCastExprToType(lex, LHSTy); 3453 3454 UsualUnaryConversions(rex); 3455 3456 // "The type of the result is that of the promoted left operand." 3457 return LHSTy; 3458} 3459 3460// C99 6.5.8 3461QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3462 unsigned OpaqueOpc, bool isRelational) { 3463 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 3464 3465 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3466 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3467 3468 // C99 6.5.8p3 / C99 6.5.9p4 3469 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3470 UsualArithmeticConversions(lex, rex); 3471 else { 3472 UsualUnaryConversions(lex); 3473 UsualUnaryConversions(rex); 3474 } 3475 QualType lType = lex->getType(); 3476 QualType rType = rex->getType(); 3477 3478 if (!lType->isFloatingType()) { 3479 // For non-floating point types, check for self-comparisons of the form 3480 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3481 // often indicate logic errors in the program. 3482 // NOTE: Don't warn about comparisons of enum constants. These can arise 3483 // from macro expansions, and are usually quite deliberate. 3484 Expr *LHSStripped = lex->IgnoreParens(); 3485 Expr *RHSStripped = rex->IgnoreParens(); 3486 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3487 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3488 if (DRL->getDecl() == DRR->getDecl() && 3489 !isa<EnumConstantDecl>(DRL->getDecl())) 3490 Diag(Loc, diag::warn_selfcomparison); 3491 3492 if (isa<CastExpr>(LHSStripped)) 3493 LHSStripped = LHSStripped->IgnoreParenCasts(); 3494 if (isa<CastExpr>(RHSStripped)) 3495 RHSStripped = RHSStripped->IgnoreParenCasts(); 3496 3497 // Warn about comparisons against a string constant (unless the other 3498 // operand is null), the user probably wants strcmp. 3499 Expr *literalString = 0; 3500 Expr *literalStringStripped = 0; 3501 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3502 !RHSStripped->isNullPointerConstant(Context)) { 3503 literalString = lex; 3504 literalStringStripped = LHSStripped; 3505 } 3506 else if ((isa<StringLiteral>(RHSStripped) || 3507 isa<ObjCEncodeExpr>(RHSStripped)) && 3508 !LHSStripped->isNullPointerConstant(Context)) { 3509 literalString = rex; 3510 literalStringStripped = RHSStripped; 3511 } 3512 3513 if (literalString) { 3514 std::string resultComparison; 3515 switch (Opc) { 3516 case BinaryOperator::LT: resultComparison = ") < 0"; break; 3517 case BinaryOperator::GT: resultComparison = ") > 0"; break; 3518 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 3519 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 3520 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 3521 case BinaryOperator::NE: resultComparison = ") != 0"; break; 3522 default: assert(false && "Invalid comparison operator"); 3523 } 3524 Diag(Loc, diag::warn_stringcompare) 3525 << isa<ObjCEncodeExpr>(literalStringStripped) 3526 << literalString->getSourceRange() 3527 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 3528 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 3529 "strcmp(") 3530 << CodeModificationHint::CreateInsertion( 3531 PP.getLocForEndOfToken(rex->getLocEnd()), 3532 resultComparison); 3533 } 3534 } 3535 3536 // The result of comparisons is 'bool' in C++, 'int' in C. 3537 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3538 3539 if (isRelational) { 3540 if (lType->isRealType() && rType->isRealType()) 3541 return ResultTy; 3542 } else { 3543 // Check for comparisons of floating point operands using != and ==. 3544 if (lType->isFloatingType()) { 3545 assert(rType->isFloatingType()); 3546 CheckFloatComparison(Loc,lex,rex); 3547 } 3548 3549 if (lType->isArithmeticType() && rType->isArithmeticType()) 3550 return ResultTy; 3551 } 3552 3553 bool LHSIsNull = lex->isNullPointerConstant(Context); 3554 bool RHSIsNull = rex->isNullPointerConstant(Context); 3555 3556 // All of the following pointer related warnings are GCC extensions, except 3557 // when handling null pointer constants. One day, we can consider making them 3558 // errors (when -pedantic-errors is enabled). 3559 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3560 QualType LCanPointeeTy = 3561 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3562 QualType RCanPointeeTy = 3563 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3564 3565 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3566 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3567 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3568 RCanPointeeTy.getUnqualifiedType()) && 3569 !Context.areComparableObjCPointerTypes(lType, rType)) { 3570 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3571 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3572 } 3573 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3574 return ResultTy; 3575 } 3576 // Handle block pointer types. 3577 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 3578 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3579 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3580 3581 if (!LHSIsNull && !RHSIsNull && 3582 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3583 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3584 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3585 } 3586 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3587 return ResultTy; 3588 } 3589 // Allow block pointers to be compared with null pointer constants. 3590 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3591 (lType->isPointerType() && rType->isBlockPointerType())) { 3592 if (!LHSIsNull && !RHSIsNull) { 3593 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3594 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3595 } 3596 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3597 return ResultTy; 3598 } 3599 3600 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3601 if (lType->isPointerType() || rType->isPointerType()) { 3602 const PointerType *LPT = lType->getAsPointerType(); 3603 const PointerType *RPT = rType->getAsPointerType(); 3604 bool LPtrToVoid = LPT ? 3605 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3606 bool RPtrToVoid = RPT ? 3607 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3608 3609 if (!LPtrToVoid && !RPtrToVoid && 3610 !Context.typesAreCompatible(lType, rType)) { 3611 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3612 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3613 ImpCastExprToType(rex, lType); 3614 return ResultTy; 3615 } 3616 ImpCastExprToType(rex, lType); 3617 return ResultTy; 3618 } 3619 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3620 ImpCastExprToType(rex, lType); 3621 return ResultTy; 3622 } else { 3623 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3624 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3625 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3626 ImpCastExprToType(rex, lType); 3627 return ResultTy; 3628 } 3629 } 3630 } 3631 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3632 rType->isIntegerType()) { 3633 if (!RHSIsNull) 3634 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3635 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3636 ImpCastExprToType(rex, lType); // promote the integer to pointer 3637 return ResultTy; 3638 } 3639 if (lType->isIntegerType() && 3640 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3641 if (!LHSIsNull) 3642 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3643 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3644 ImpCastExprToType(lex, rType); // promote the integer to pointer 3645 return ResultTy; 3646 } 3647 // Handle block pointers. 3648 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3649 if (!RHSIsNull) 3650 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3651 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3652 ImpCastExprToType(rex, lType); // promote the integer to pointer 3653 return ResultTy; 3654 } 3655 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3656 if (!LHSIsNull) 3657 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3658 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3659 ImpCastExprToType(lex, rType); // promote the integer to pointer 3660 return ResultTy; 3661 } 3662 return InvalidOperands(Loc, lex, rex); 3663} 3664 3665/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3666/// operates on extended vector types. Instead of producing an IntTy result, 3667/// like a scalar comparison, a vector comparison produces a vector of integer 3668/// types. 3669QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3670 SourceLocation Loc, 3671 bool isRelational) { 3672 // Check to make sure we're operating on vectors of the same type and width, 3673 // Allowing one side to be a scalar of element type. 3674 QualType vType = CheckVectorOperands(Loc, lex, rex); 3675 if (vType.isNull()) 3676 return vType; 3677 3678 QualType lType = lex->getType(); 3679 QualType rType = rex->getType(); 3680 3681 // For non-floating point types, check for self-comparisons of the form 3682 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3683 // often indicate logic errors in the program. 3684 if (!lType->isFloatingType()) { 3685 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3686 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3687 if (DRL->getDecl() == DRR->getDecl()) 3688 Diag(Loc, diag::warn_selfcomparison); 3689 } 3690 3691 // Check for comparisons of floating point operands using != and ==. 3692 if (!isRelational && lType->isFloatingType()) { 3693 assert (rType->isFloatingType()); 3694 CheckFloatComparison(Loc,lex,rex); 3695 } 3696 3697 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 3698 // just reject all vector comparisons for now. 3699 if (1) { 3700 Diag(Loc, diag::err_typecheck_vector_comparison) 3701 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3702 return QualType(); 3703 } 3704 3705 // Return the type for the comparison, which is the same as vector type for 3706 // integer vectors, or an integer type of identical size and number of 3707 // elements for floating point vectors. 3708 if (lType->isIntegerType()) 3709 return lType; 3710 3711 const VectorType *VTy = lType->getAsVectorType(); 3712 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3713 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3714 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3715 if (TypeSize == Context.getTypeSize(Context.LongTy)) 3716 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3717 3718 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3719 "Unhandled vector element size in vector compare"); 3720 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3721} 3722 3723inline QualType Sema::CheckBitwiseOperands( 3724 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3725{ 3726 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3727 return CheckVectorOperands(Loc, lex, rex); 3728 3729 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3730 3731 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3732 return compType; 3733 return InvalidOperands(Loc, lex, rex); 3734} 3735 3736inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3737 Expr *&lex, Expr *&rex, SourceLocation Loc) 3738{ 3739 UsualUnaryConversions(lex); 3740 UsualUnaryConversions(rex); 3741 3742 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3743 return Context.IntTy; 3744 return InvalidOperands(Loc, lex, rex); 3745} 3746 3747/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3748/// is a read-only property; return true if so. A readonly property expression 3749/// depends on various declarations and thus must be treated specially. 3750/// 3751static bool IsReadonlyProperty(Expr *E, Sema &S) 3752{ 3753 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3754 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3755 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3756 QualType BaseType = PropExpr->getBase()->getType(); 3757 if (const PointerType *PTy = BaseType->getAsPointerType()) 3758 if (const ObjCInterfaceType *IFTy = 3759 PTy->getPointeeType()->getAsObjCInterfaceType()) 3760 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3761 if (S.isPropertyReadonly(PDecl, IFace)) 3762 return true; 3763 } 3764 } 3765 return false; 3766} 3767 3768/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3769/// emit an error and return true. If so, return false. 3770static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3771 SourceLocation OrigLoc = Loc; 3772 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 3773 &Loc); 3774 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3775 IsLV = Expr::MLV_ReadonlyProperty; 3776 if (IsLV == Expr::MLV_Valid) 3777 return false; 3778 3779 unsigned Diag = 0; 3780 bool NeedType = false; 3781 switch (IsLV) { // C99 6.5.16p2 3782 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3783 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3784 case Expr::MLV_ArrayType: 3785 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3786 NeedType = true; 3787 break; 3788 case Expr::MLV_NotObjectType: 3789 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3790 NeedType = true; 3791 break; 3792 case Expr::MLV_LValueCast: 3793 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3794 break; 3795 case Expr::MLV_InvalidExpression: 3796 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3797 break; 3798 case Expr::MLV_IncompleteType: 3799 case Expr::MLV_IncompleteVoidType: 3800 return S.RequireCompleteType(Loc, E->getType(), 3801 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3802 E->getSourceRange()); 3803 case Expr::MLV_DuplicateVectorComponents: 3804 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 3805 break; 3806 case Expr::MLV_NotBlockQualified: 3807 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 3808 break; 3809 case Expr::MLV_ReadonlyProperty: 3810 Diag = diag::error_readonly_property_assignment; 3811 break; 3812 case Expr::MLV_NoSetterProperty: 3813 Diag = diag::error_nosetter_property_assignment; 3814 break; 3815 } 3816 3817 SourceRange Assign; 3818 if (Loc != OrigLoc) 3819 Assign = SourceRange(OrigLoc, OrigLoc); 3820 if (NeedType) 3821 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 3822 else 3823 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 3824 return true; 3825} 3826 3827 3828 3829// C99 6.5.16.1 3830QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 3831 SourceLocation Loc, 3832 QualType CompoundType) { 3833 // Verify that LHS is a modifiable lvalue, and emit error if not. 3834 if (CheckForModifiableLvalue(LHS, Loc, *this)) 3835 return QualType(); 3836 3837 QualType LHSType = LHS->getType(); 3838 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 3839 3840 AssignConvertType ConvTy; 3841 if (CompoundType.isNull()) { 3842 // Simple assignment "x = y". 3843 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 3844 // Special case of NSObject attributes on c-style pointer types. 3845 if (ConvTy == IncompatiblePointer && 3846 ((Context.isObjCNSObjectType(LHSType) && 3847 Context.isObjCObjectPointerType(RHSType)) || 3848 (Context.isObjCNSObjectType(RHSType) && 3849 Context.isObjCObjectPointerType(LHSType)))) 3850 ConvTy = Compatible; 3851 3852 // If the RHS is a unary plus or minus, check to see if they = and + are 3853 // right next to each other. If so, the user may have typo'd "x =+ 4" 3854 // instead of "x += 4". 3855 Expr *RHSCheck = RHS; 3856 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 3857 RHSCheck = ICE->getSubExpr(); 3858 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 3859 if ((UO->getOpcode() == UnaryOperator::Plus || 3860 UO->getOpcode() == UnaryOperator::Minus) && 3861 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 3862 // Only if the two operators are exactly adjacent. 3863 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 3864 // And there is a space or other character before the subexpr of the 3865 // unary +/-. We don't want to warn on "x=-1". 3866 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 3867 UO->getSubExpr()->getLocStart().isFileID()) { 3868 Diag(Loc, diag::warn_not_compound_assign) 3869 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 3870 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 3871 } 3872 } 3873 } else { 3874 // Compound assignment "x += y" 3875 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 3876 } 3877 3878 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 3879 RHS, "assigning")) 3880 return QualType(); 3881 3882 // C99 6.5.16p3: The type of an assignment expression is the type of the 3883 // left operand unless the left operand has qualified type, in which case 3884 // it is the unqualified version of the type of the left operand. 3885 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 3886 // is converted to the type of the assignment expression (above). 3887 // C++ 5.17p1: the type of the assignment expression is that of its left 3888 // oprdu. 3889 return LHSType.getUnqualifiedType(); 3890} 3891 3892// C99 6.5.17 3893QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 3894 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 3895 DefaultFunctionArrayConversion(RHS); 3896 3897 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 3898 // incomplete in C++). 3899 3900 return RHS->getType(); 3901} 3902 3903/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 3904/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 3905QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 3906 bool isInc) { 3907 if (Op->isTypeDependent()) 3908 return Context.DependentTy; 3909 3910 QualType ResType = Op->getType(); 3911 assert(!ResType.isNull() && "no type for increment/decrement expression"); 3912 3913 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 3914 // Decrement of bool is not allowed. 3915 if (!isInc) { 3916 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 3917 return QualType(); 3918 } 3919 // Increment of bool sets it to true, but is deprecated. 3920 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 3921 } else if (ResType->isRealType()) { 3922 // OK! 3923 } else if (const PointerType *PT = ResType->getAsPointerType()) { 3924 // C99 6.5.2.4p2, 6.5.6p2 3925 if (PT->getPointeeType()->isVoidType()) { 3926 if (getLangOptions().CPlusPlus) { 3927 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 3928 << Op->getSourceRange(); 3929 return QualType(); 3930 } 3931 3932 // Pointer to void is a GNU extension in C. 3933 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 3934 } else if (PT->getPointeeType()->isFunctionType()) { 3935 if (getLangOptions().CPlusPlus) { 3936 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 3937 << Op->getType() << Op->getSourceRange(); 3938 return QualType(); 3939 } 3940 3941 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 3942 << ResType << Op->getSourceRange(); 3943 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 3944 diag::err_typecheck_arithmetic_incomplete_type, 3945 Op->getSourceRange(), SourceRange(), 3946 ResType)) 3947 return QualType(); 3948 } else if (ResType->isComplexType()) { 3949 // C99 does not support ++/-- on complex types, we allow as an extension. 3950 Diag(OpLoc, diag::ext_integer_increment_complex) 3951 << ResType << Op->getSourceRange(); 3952 } else { 3953 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 3954 << ResType << Op->getSourceRange(); 3955 return QualType(); 3956 } 3957 // At this point, we know we have a real, complex or pointer type. 3958 // Now make sure the operand is a modifiable lvalue. 3959 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 3960 return QualType(); 3961 return ResType; 3962} 3963 3964/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 3965/// This routine allows us to typecheck complex/recursive expressions 3966/// where the declaration is needed for type checking. We only need to 3967/// handle cases when the expression references a function designator 3968/// or is an lvalue. Here are some examples: 3969/// - &(x) => x 3970/// - &*****f => f for f a function designator. 3971/// - &s.xx => s 3972/// - &s.zz[1].yy -> s, if zz is an array 3973/// - *(x + 1) -> x, if x is an array 3974/// - &"123"[2] -> 0 3975/// - & __real__ x -> x 3976static NamedDecl *getPrimaryDecl(Expr *E) { 3977 switch (E->getStmtClass()) { 3978 case Stmt::DeclRefExprClass: 3979 case Stmt::QualifiedDeclRefExprClass: 3980 return cast<DeclRefExpr>(E)->getDecl(); 3981 case Stmt::MemberExprClass: 3982 // If this is an arrow operator, the address is an offset from 3983 // the base's value, so the object the base refers to is 3984 // irrelevant. 3985 if (cast<MemberExpr>(E)->isArrow()) 3986 return 0; 3987 // Otherwise, the expression refers to a part of the base 3988 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 3989 case Stmt::ArraySubscriptExprClass: { 3990 // FIXME: This code shouldn't be necessary! We should catch the 3991 // implicit promotion of register arrays earlier. 3992 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 3993 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 3994 if (ICE->getSubExpr()->getType()->isArrayType()) 3995 return getPrimaryDecl(ICE->getSubExpr()); 3996 } 3997 return 0; 3998 } 3999 case Stmt::UnaryOperatorClass: { 4000 UnaryOperator *UO = cast<UnaryOperator>(E); 4001 4002 switch(UO->getOpcode()) { 4003 case UnaryOperator::Real: 4004 case UnaryOperator::Imag: 4005 case UnaryOperator::Extension: 4006 return getPrimaryDecl(UO->getSubExpr()); 4007 default: 4008 return 0; 4009 } 4010 } 4011 case Stmt::ParenExprClass: 4012 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4013 case Stmt::ImplicitCastExprClass: 4014 // If the result of an implicit cast is an l-value, we care about 4015 // the sub-expression; otherwise, the result here doesn't matter. 4016 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4017 default: 4018 return 0; 4019 } 4020} 4021 4022/// CheckAddressOfOperand - The operand of & must be either a function 4023/// designator or an lvalue designating an object. If it is an lvalue, the 4024/// object cannot be declared with storage class register or be a bit field. 4025/// Note: The usual conversions are *not* applied to the operand of the & 4026/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4027/// In C++, the operand might be an overloaded function name, in which case 4028/// we allow the '&' but retain the overloaded-function type. 4029QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4030 // Make sure to ignore parentheses in subsequent checks 4031 op = op->IgnoreParens(); 4032 4033 if (op->isTypeDependent()) 4034 return Context.DependentTy; 4035 4036 if (getLangOptions().C99) { 4037 // Implement C99-only parts of addressof rules. 4038 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4039 if (uOp->getOpcode() == UnaryOperator::Deref) 4040 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4041 // (assuming the deref expression is valid). 4042 return uOp->getSubExpr()->getType(); 4043 } 4044 // Technically, there should be a check for array subscript 4045 // expressions here, but the result of one is always an lvalue anyway. 4046 } 4047 NamedDecl *dcl = getPrimaryDecl(op); 4048 Expr::isLvalueResult lval = op->isLvalue(Context); 4049 4050 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 4051 // The operand must be either an l-value or a function designator 4052 if (!dcl || !isa<FunctionDecl>(dcl)) { 4053 // FIXME: emit more specific diag... 4054 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4055 << op->getSourceRange(); 4056 return QualType(); 4057 } 4058 } else if (op->isBitField()) { // C99 6.5.3.2p1 4059 // The operand cannot be a bit-field 4060 Diag(OpLoc, diag::err_typecheck_address_of) 4061 << "bit-field" << op->getSourceRange(); 4062 return QualType(); 4063 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4064 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4065 // The operand cannot be an element of a vector 4066 Diag(OpLoc, diag::err_typecheck_address_of) 4067 << "vector element" << op->getSourceRange(); 4068 return QualType(); 4069 } else if (dcl) { // C99 6.5.3.2p1 4070 // We have an lvalue with a decl. Make sure the decl is not declared 4071 // with the register storage-class specifier. 4072 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4073 if (vd->getStorageClass() == VarDecl::Register) { 4074 Diag(OpLoc, diag::err_typecheck_address_of) 4075 << "register variable" << op->getSourceRange(); 4076 return QualType(); 4077 } 4078 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4079 return Context.OverloadTy; 4080 } else if (isa<FieldDecl>(dcl)) { 4081 // Okay: we can take the address of a field. 4082 // Could be a pointer to member, though, if there is an explicit 4083 // scope qualifier for the class. 4084 if (isa<QualifiedDeclRefExpr>(op)) { 4085 DeclContext *Ctx = dcl->getDeclContext(); 4086 if (Ctx && Ctx->isRecord()) 4087 return Context.getMemberPointerType(op->getType(), 4088 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4089 } 4090 } else if (isa<FunctionDecl>(dcl)) { 4091 // Okay: we can take the address of a function. 4092 // As above. 4093 if (isa<QualifiedDeclRefExpr>(op)) { 4094 DeclContext *Ctx = dcl->getDeclContext(); 4095 if (Ctx && Ctx->isRecord()) 4096 return Context.getMemberPointerType(op->getType(), 4097 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4098 } 4099 } 4100 else 4101 assert(0 && "Unknown/unexpected decl type"); 4102 } 4103 4104 // If the operand has type "type", the result has type "pointer to type". 4105 return Context.getPointerType(op->getType()); 4106} 4107 4108QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4109 if (Op->isTypeDependent()) 4110 return Context.DependentTy; 4111 4112 UsualUnaryConversions(Op); 4113 QualType Ty = Op->getType(); 4114 4115 // Note that per both C89 and C99, this is always legal, even if ptype is an 4116 // incomplete type or void. It would be possible to warn about dereferencing 4117 // a void pointer, but it's completely well-defined, and such a warning is 4118 // unlikely to catch any mistakes. 4119 if (const PointerType *PT = Ty->getAsPointerType()) 4120 return PT->getPointeeType(); 4121 4122 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4123 << Ty << Op->getSourceRange(); 4124 return QualType(); 4125} 4126 4127static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4128 tok::TokenKind Kind) { 4129 BinaryOperator::Opcode Opc; 4130 switch (Kind) { 4131 default: assert(0 && "Unknown binop!"); 4132 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4133 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4134 case tok::star: Opc = BinaryOperator::Mul; break; 4135 case tok::slash: Opc = BinaryOperator::Div; break; 4136 case tok::percent: Opc = BinaryOperator::Rem; break; 4137 case tok::plus: Opc = BinaryOperator::Add; break; 4138 case tok::minus: Opc = BinaryOperator::Sub; break; 4139 case tok::lessless: Opc = BinaryOperator::Shl; break; 4140 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4141 case tok::lessequal: Opc = BinaryOperator::LE; break; 4142 case tok::less: Opc = BinaryOperator::LT; break; 4143 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4144 case tok::greater: Opc = BinaryOperator::GT; break; 4145 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4146 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4147 case tok::amp: Opc = BinaryOperator::And; break; 4148 case tok::caret: Opc = BinaryOperator::Xor; break; 4149 case tok::pipe: Opc = BinaryOperator::Or; break; 4150 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4151 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4152 case tok::equal: Opc = BinaryOperator::Assign; break; 4153 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4154 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4155 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4156 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4157 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4158 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4159 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4160 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4161 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4162 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4163 case tok::comma: Opc = BinaryOperator::Comma; break; 4164 } 4165 return Opc; 4166} 4167 4168static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4169 tok::TokenKind Kind) { 4170 UnaryOperator::Opcode Opc; 4171 switch (Kind) { 4172 default: assert(0 && "Unknown unary op!"); 4173 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4174 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4175 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4176 case tok::star: Opc = UnaryOperator::Deref; break; 4177 case tok::plus: Opc = UnaryOperator::Plus; break; 4178 case tok::minus: Opc = UnaryOperator::Minus; break; 4179 case tok::tilde: Opc = UnaryOperator::Not; break; 4180 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4181 case tok::kw___real: Opc = UnaryOperator::Real; break; 4182 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4183 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4184 } 4185 return Opc; 4186} 4187 4188/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4189/// operator @p Opc at location @c TokLoc. This routine only supports 4190/// built-in operations; ActOnBinOp handles overloaded operators. 4191Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4192 unsigned Op, 4193 Expr *lhs, Expr *rhs) { 4194 QualType ResultTy; // Result type of the binary operator. 4195 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4196 // The following two variables are used for compound assignment operators 4197 QualType CompLHSTy; // Type of LHS after promotions for computation 4198 QualType CompResultTy; // Type of computation result 4199 4200 switch (Opc) { 4201 case BinaryOperator::Assign: 4202 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4203 break; 4204 case BinaryOperator::PtrMemD: 4205 case BinaryOperator::PtrMemI: 4206 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4207 Opc == BinaryOperator::PtrMemI); 4208 break; 4209 case BinaryOperator::Mul: 4210 case BinaryOperator::Div: 4211 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4212 break; 4213 case BinaryOperator::Rem: 4214 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4215 break; 4216 case BinaryOperator::Add: 4217 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4218 break; 4219 case BinaryOperator::Sub: 4220 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4221 break; 4222 case BinaryOperator::Shl: 4223 case BinaryOperator::Shr: 4224 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4225 break; 4226 case BinaryOperator::LE: 4227 case BinaryOperator::LT: 4228 case BinaryOperator::GE: 4229 case BinaryOperator::GT: 4230 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4231 break; 4232 case BinaryOperator::EQ: 4233 case BinaryOperator::NE: 4234 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4235 break; 4236 case BinaryOperator::And: 4237 case BinaryOperator::Xor: 4238 case BinaryOperator::Or: 4239 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4240 break; 4241 case BinaryOperator::LAnd: 4242 case BinaryOperator::LOr: 4243 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4244 break; 4245 case BinaryOperator::MulAssign: 4246 case BinaryOperator::DivAssign: 4247 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4248 CompLHSTy = CompResultTy; 4249 if (!CompResultTy.isNull()) 4250 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4251 break; 4252 case BinaryOperator::RemAssign: 4253 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4254 CompLHSTy = CompResultTy; 4255 if (!CompResultTy.isNull()) 4256 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4257 break; 4258 case BinaryOperator::AddAssign: 4259 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4260 if (!CompResultTy.isNull()) 4261 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4262 break; 4263 case BinaryOperator::SubAssign: 4264 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4265 if (!CompResultTy.isNull()) 4266 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4267 break; 4268 case BinaryOperator::ShlAssign: 4269 case BinaryOperator::ShrAssign: 4270 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4271 CompLHSTy = CompResultTy; 4272 if (!CompResultTy.isNull()) 4273 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4274 break; 4275 case BinaryOperator::AndAssign: 4276 case BinaryOperator::XorAssign: 4277 case BinaryOperator::OrAssign: 4278 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4279 CompLHSTy = CompResultTy; 4280 if (!CompResultTy.isNull()) 4281 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4282 break; 4283 case BinaryOperator::Comma: 4284 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4285 break; 4286 } 4287 if (ResultTy.isNull()) 4288 return ExprError(); 4289 if (CompResultTy.isNull()) 4290 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4291 else 4292 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4293 CompLHSTy, CompResultTy, 4294 OpLoc)); 4295} 4296 4297// Binary Operators. 'Tok' is the token for the operator. 4298Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4299 tok::TokenKind Kind, 4300 ExprArg LHS, ExprArg RHS) { 4301 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4302 Expr *lhs = (Expr *)LHS.release(), *rhs = (Expr*)RHS.release(); 4303 4304 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4305 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4306 4307 if (getLangOptions().CPlusPlus && 4308 (lhs->getType()->isOverloadableType() || 4309 rhs->getType()->isOverloadableType())) { 4310 // Find all of the overloaded operators visible from this 4311 // point. We perform both an operator-name lookup from the local 4312 // scope and an argument-dependent lookup based on the types of 4313 // the arguments. 4314 FunctionSet Functions; 4315 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4316 if (OverOp != OO_None) { 4317 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4318 Functions); 4319 Expr *Args[2] = { lhs, rhs }; 4320 DeclarationName OpName 4321 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4322 ArgumentDependentLookup(OpName, Args, 2, Functions); 4323 } 4324 4325 // Build the (potentially-overloaded, potentially-dependent) 4326 // binary operation. 4327 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4328 } 4329 4330 // Build a built-in binary operation. 4331 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4332} 4333 4334Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4335 unsigned OpcIn, 4336 ExprArg InputArg) { 4337 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4338 4339 // FIXME: Input is modified below, but InputArg is not updated 4340 // appropriately. 4341 Expr *Input = (Expr *)InputArg.get(); 4342 QualType resultType; 4343 switch (Opc) { 4344 case UnaryOperator::PostInc: 4345 case UnaryOperator::PostDec: 4346 case UnaryOperator::OffsetOf: 4347 assert(false && "Invalid unary operator"); 4348 break; 4349 4350 case UnaryOperator::PreInc: 4351 case UnaryOperator::PreDec: 4352 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4353 Opc == UnaryOperator::PreInc); 4354 break; 4355 case UnaryOperator::AddrOf: 4356 resultType = CheckAddressOfOperand(Input, OpLoc); 4357 break; 4358 case UnaryOperator::Deref: 4359 DefaultFunctionArrayConversion(Input); 4360 resultType = CheckIndirectionOperand(Input, OpLoc); 4361 break; 4362 case UnaryOperator::Plus: 4363 case UnaryOperator::Minus: 4364 UsualUnaryConversions(Input); 4365 resultType = Input->getType(); 4366 if (resultType->isDependentType()) 4367 break; 4368 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4369 break; 4370 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4371 resultType->isEnumeralType()) 4372 break; 4373 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4374 Opc == UnaryOperator::Plus && 4375 resultType->isPointerType()) 4376 break; 4377 4378 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4379 << resultType << Input->getSourceRange()); 4380 case UnaryOperator::Not: // bitwise complement 4381 UsualUnaryConversions(Input); 4382 resultType = Input->getType(); 4383 if (resultType->isDependentType()) 4384 break; 4385 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4386 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4387 // C99 does not support '~' for complex conjugation. 4388 Diag(OpLoc, diag::ext_integer_complement_complex) 4389 << resultType << Input->getSourceRange(); 4390 else if (!resultType->isIntegerType()) 4391 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4392 << resultType << Input->getSourceRange()); 4393 break; 4394 case UnaryOperator::LNot: // logical negation 4395 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4396 DefaultFunctionArrayConversion(Input); 4397 resultType = Input->getType(); 4398 if (resultType->isDependentType()) 4399 break; 4400 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4401 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4402 << resultType << Input->getSourceRange()); 4403 // LNot always has type int. C99 6.5.3.3p5. 4404 // In C++, it's bool. C++ 5.3.1p8 4405 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4406 break; 4407 case UnaryOperator::Real: 4408 case UnaryOperator::Imag: 4409 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4410 break; 4411 case UnaryOperator::Extension: 4412 resultType = Input->getType(); 4413 break; 4414 } 4415 if (resultType.isNull()) 4416 return ExprError(); 4417 4418 InputArg.release(); 4419 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4420} 4421 4422// Unary Operators. 'Tok' is the token for the operator. 4423Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4424 tok::TokenKind Op, ExprArg input) { 4425 Expr *Input = (Expr*)input.get(); 4426 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4427 4428 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4429 // Find all of the overloaded operators visible from this 4430 // point. We perform both an operator-name lookup from the local 4431 // scope and an argument-dependent lookup based on the types of 4432 // the arguments. 4433 FunctionSet Functions; 4434 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4435 if (OverOp != OO_None) { 4436 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4437 Functions); 4438 DeclarationName OpName 4439 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4440 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4441 } 4442 4443 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4444 } 4445 4446 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4447} 4448 4449/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4450Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4451 SourceLocation LabLoc, 4452 IdentifierInfo *LabelII) { 4453 // Look up the record for this label identifier. 4454 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 4455 4456 // If we haven't seen this label yet, create a forward reference. It 4457 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4458 if (LabelDecl == 0) 4459 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4460 4461 // Create the AST node. The address of a label always has type 'void*'. 4462 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4463 Context.getPointerType(Context.VoidTy))); 4464} 4465 4466Sema::OwningExprResult 4467Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4468 SourceLocation RPLoc) { // "({..})" 4469 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4470 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4471 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4472 4473 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4474 if (isFileScope) { 4475 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4476 } 4477 4478 // FIXME: there are a variety of strange constraints to enforce here, for 4479 // example, it is not possible to goto into a stmt expression apparently. 4480 // More semantic analysis is needed. 4481 4482 // FIXME: the last statement in the compount stmt has its value used. We 4483 // should not warn about it being unused. 4484 4485 // If there are sub stmts in the compound stmt, take the type of the last one 4486 // as the type of the stmtexpr. 4487 QualType Ty = Context.VoidTy; 4488 4489 if (!Compound->body_empty()) { 4490 Stmt *LastStmt = Compound->body_back(); 4491 // If LastStmt is a label, skip down through into the body. 4492 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4493 LastStmt = Label->getSubStmt(); 4494 4495 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4496 Ty = LastExpr->getType(); 4497 } 4498 4499 // FIXME: Check that expression type is complete/non-abstract; statement 4500 // expressions are not lvalues. 4501 4502 substmt.release(); 4503 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4504} 4505 4506Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4507 SourceLocation BuiltinLoc, 4508 SourceLocation TypeLoc, 4509 TypeTy *argty, 4510 OffsetOfComponent *CompPtr, 4511 unsigned NumComponents, 4512 SourceLocation RPLoc) { 4513 // FIXME: This function leaks all expressions in the offset components on 4514 // error. 4515 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4516 assert(!ArgTy.isNull() && "Missing type argument!"); 4517 4518 bool Dependent = ArgTy->isDependentType(); 4519 4520 // We must have at least one component that refers to the type, and the first 4521 // one is known to be a field designator. Verify that the ArgTy represents 4522 // a struct/union/class. 4523 if (!Dependent && !ArgTy->isRecordType()) 4524 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4525 4526 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 4527 // with an incomplete type would be illegal. 4528 4529 // Otherwise, create a null pointer as the base, and iteratively process 4530 // the offsetof designators. 4531 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4532 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4533 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4534 ArgTy, SourceLocation()); 4535 4536 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4537 // GCC extension, diagnose them. 4538 // FIXME: This diagnostic isn't actually visible because the location is in 4539 // a system header! 4540 if (NumComponents != 1) 4541 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4542 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4543 4544 if (!Dependent) { 4545 // FIXME: Dependent case loses a lot of information here. And probably 4546 // leaks like a sieve. 4547 for (unsigned i = 0; i != NumComponents; ++i) { 4548 const OffsetOfComponent &OC = CompPtr[i]; 4549 if (OC.isBrackets) { 4550 // Offset of an array sub-field. TODO: Should we allow vector elements? 4551 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4552 if (!AT) { 4553 Res->Destroy(Context); 4554 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 4555 << Res->getType()); 4556 } 4557 4558 // FIXME: C++: Verify that operator[] isn't overloaded. 4559 4560 // Promote the array so it looks more like a normal array subscript 4561 // expression. 4562 DefaultFunctionArrayConversion(Res); 4563 4564 // C99 6.5.2.1p1 4565 Expr *Idx = static_cast<Expr*>(OC.U.E); 4566 // FIXME: Leaks Res 4567 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4568 return ExprError(Diag(Idx->getLocStart(), 4569 diag::err_typecheck_subscript) 4570 << Idx->getSourceRange()); 4571 4572 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4573 OC.LocEnd); 4574 continue; 4575 } 4576 4577 const RecordType *RC = Res->getType()->getAsRecordType(); 4578 if (!RC) { 4579 Res->Destroy(Context); 4580 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 4581 << Res->getType()); 4582 } 4583 4584 // Get the decl corresponding to this. 4585 RecordDecl *RD = RC->getDecl(); 4586 FieldDecl *MemberDecl 4587 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4588 LookupMemberName) 4589 .getAsDecl()); 4590 // FIXME: Leaks Res 4591 if (!MemberDecl) 4592 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 4593 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 4594 4595 // FIXME: C++: Verify that MemberDecl isn't a static field. 4596 // FIXME: Verify that MemberDecl isn't a bitfield. 4597 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 4598 // matter here. 4599 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4600 MemberDecl->getType().getNonReferenceType()); 4601 } 4602 } 4603 4604 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4605 Context.getSizeType(), BuiltinLoc)); 4606} 4607 4608 4609Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4610 TypeTy *arg1,TypeTy *arg2, 4611 SourceLocation RPLoc) { 4612 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4613 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4614 4615 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4616 4617 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 4618 argT1, argT2, RPLoc)); 4619} 4620 4621Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 4622 ExprArg cond, 4623 ExprArg expr1, ExprArg expr2, 4624 SourceLocation RPLoc) { 4625 Expr *CondExpr = static_cast<Expr*>(cond.get()); 4626 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 4627 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 4628 4629 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4630 4631 QualType resType; 4632 if (CondExpr->isValueDependent()) { 4633 resType = Context.DependentTy; 4634 } else { 4635 // The conditional expression is required to be a constant expression. 4636 llvm::APSInt condEval(32); 4637 SourceLocation ExpLoc; 4638 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4639 return ExprError(Diag(ExpLoc, 4640 diag::err_typecheck_choose_expr_requires_constant) 4641 << CondExpr->getSourceRange()); 4642 4643 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4644 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 4645 } 4646 4647 cond.release(); expr1.release(); expr2.release(); 4648 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4649 resType, RPLoc)); 4650} 4651 4652//===----------------------------------------------------------------------===// 4653// Clang Extensions. 4654//===----------------------------------------------------------------------===// 4655 4656/// ActOnBlockStart - This callback is invoked when a block literal is started. 4657void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4658 // Analyze block parameters. 4659 BlockSemaInfo *BSI = new BlockSemaInfo(); 4660 4661 // Add BSI to CurBlock. 4662 BSI->PrevBlockInfo = CurBlock; 4663 CurBlock = BSI; 4664 4665 BSI->ReturnType = 0; 4666 BSI->TheScope = BlockScope; 4667 BSI->hasBlockDeclRefExprs = false; 4668 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 4669 CurFunctionNeedsScopeChecking = false; 4670 4671 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4672 PushDeclContext(BlockScope, BSI->TheDecl); 4673} 4674 4675void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4676 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4677 4678 if (ParamInfo.getNumTypeObjects() == 0 4679 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4680 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4681 4682 // The type is entirely optional as well, if none, use DependentTy. 4683 if (T.isNull()) 4684 T = Context.DependentTy; 4685 4686 // The parameter list is optional, if there was none, assume (). 4687 if (!T->isFunctionType()) 4688 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4689 4690 CurBlock->hasPrototype = true; 4691 CurBlock->isVariadic = false; 4692 4693 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 4694 4695 // Do not allow returning a objc interface by-value. 4696 if (RetTy->isObjCInterfaceType()) { 4697 Diag(ParamInfo.getSourceRange().getBegin(), 4698 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 4699 return; 4700 } 4701 4702 if (!RetTy->isDependentType()) 4703 CurBlock->ReturnType = RetTy.getTypePtr(); 4704 return; 4705 } 4706 4707 // Analyze arguments to block. 4708 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4709 "Not a function declarator!"); 4710 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4711 4712 CurBlock->hasPrototype = FTI.hasPrototype; 4713 CurBlock->isVariadic = true; 4714 4715 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4716 // no arguments, not a function that takes a single void argument. 4717 if (FTI.hasPrototype && 4718 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4719 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 4720 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 4721 // empty arg list, don't push any params. 4722 CurBlock->isVariadic = false; 4723 } else if (FTI.hasPrototype) { 4724 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4725 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 4726 CurBlock->isVariadic = FTI.isVariadic; 4727 } 4728 CurBlock->TheDecl->setParams(Context, &CurBlock->Params[0], 4729 CurBlock->Params.size()); 4730 4731 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4732 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4733 // If this has an identifier, add it to the scope stack. 4734 if ((*AI)->getIdentifier()) 4735 PushOnScopeChains(*AI, CurBlock->TheScope); 4736 4737 // Analyze the return type. 4738 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4739 QualType RetTy = T->getAsFunctionType()->getResultType(); 4740 4741 // Do not allow returning a objc interface by-value. 4742 if (RetTy->isObjCInterfaceType()) { 4743 Diag(ParamInfo.getSourceRange().getBegin(), 4744 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 4745 } else if (!RetTy->isDependentType()) 4746 CurBlock->ReturnType = RetTy.getTypePtr(); 4747} 4748 4749/// ActOnBlockError - If there is an error parsing a block, this callback 4750/// is invoked to pop the information about the block from the action impl. 4751void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4752 // Ensure that CurBlock is deleted. 4753 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4754 4755 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 4756 4757 // Pop off CurBlock, handle nested blocks. 4758 PopDeclContext(); 4759 CurBlock = CurBlock->PrevBlockInfo; 4760 // FIXME: Delete the ParmVarDecl objects as well??? 4761} 4762 4763/// ActOnBlockStmtExpr - This is called when the body of a block statement 4764/// literal was successfully completed. ^(int x){...} 4765Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 4766 StmtArg body, Scope *CurScope) { 4767 // If blocks are disabled, emit an error. 4768 if (!LangOpts.Blocks) 4769 Diag(CaretLoc, diag::err_blocks_disable); 4770 4771 // Ensure that CurBlock is deleted. 4772 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4773 4774 PopDeclContext(); 4775 4776 // Pop off CurBlock, handle nested blocks. 4777 CurBlock = CurBlock->PrevBlockInfo; 4778 4779 QualType RetTy = Context.VoidTy; 4780 if (BSI->ReturnType) 4781 RetTy = QualType(BSI->ReturnType, 0); 4782 4783 llvm::SmallVector<QualType, 8> ArgTypes; 4784 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4785 ArgTypes.push_back(BSI->Params[i]->getType()); 4786 4787 QualType BlockTy; 4788 if (!BSI->hasPrototype) 4789 BlockTy = Context.getFunctionNoProtoType(RetTy); 4790 else 4791 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 4792 BSI->isVariadic, 0); 4793 4794 // FIXME: Check that return/parameter types are complete/non-abstract 4795 4796 BlockTy = Context.getBlockPointerType(BlockTy); 4797 4798 // If needed, diagnose invalid gotos and switches in the block. 4799 if (CurFunctionNeedsScopeChecking) 4800 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 4801 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 4802 4803 BSI->TheDecl->setBody(static_cast<CompoundStmt*>(body.release())); 4804 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 4805 BSI->hasBlockDeclRefExprs)); 4806} 4807 4808Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 4809 ExprArg expr, TypeTy *type, 4810 SourceLocation RPLoc) { 4811 QualType T = QualType::getFromOpaquePtr(type); 4812 Expr *E = static_cast<Expr*>(expr.get()); 4813 Expr *OrigExpr = E; 4814 4815 InitBuiltinVaListType(); 4816 4817 // Get the va_list type 4818 QualType VaListType = Context.getBuiltinVaListType(); 4819 // Deal with implicit array decay; for example, on x86-64, 4820 // va_list is an array, but it's supposed to decay to 4821 // a pointer for va_arg. 4822 if (VaListType->isArrayType()) 4823 VaListType = Context.getArrayDecayedType(VaListType); 4824 // Make sure the input expression also decays appropriately. 4825 UsualUnaryConversions(E); 4826 4827 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) { 4828 return ExprError(Diag(E->getLocStart(), 4829 diag::err_first_argument_to_va_arg_not_of_type_va_list) 4830 << OrigExpr->getType() << E->getSourceRange()); 4831 } 4832 4833 // FIXME: Check that type is complete/non-abstract 4834 // FIXME: Warn if a non-POD type is passed in. 4835 4836 expr.release(); 4837 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 4838 RPLoc)); 4839} 4840 4841Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 4842 // The type of __null will be int or long, depending on the size of 4843 // pointers on the target. 4844 QualType Ty; 4845 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 4846 Ty = Context.IntTy; 4847 else 4848 Ty = Context.LongTy; 4849 4850 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 4851} 4852 4853bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 4854 SourceLocation Loc, 4855 QualType DstType, QualType SrcType, 4856 Expr *SrcExpr, const char *Flavor) { 4857 // Decode the result (notice that AST's are still created for extensions). 4858 bool isInvalid = false; 4859 unsigned DiagKind; 4860 switch (ConvTy) { 4861 default: assert(0 && "Unknown conversion type"); 4862 case Compatible: return false; 4863 case PointerToInt: 4864 DiagKind = diag::ext_typecheck_convert_pointer_int; 4865 break; 4866 case IntToPointer: 4867 DiagKind = diag::ext_typecheck_convert_int_pointer; 4868 break; 4869 case IncompatiblePointer: 4870 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 4871 break; 4872 case IncompatiblePointerSign: 4873 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 4874 break; 4875 case FunctionVoidPointer: 4876 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 4877 break; 4878 case CompatiblePointerDiscardsQualifiers: 4879 // If the qualifiers lost were because we were applying the 4880 // (deprecated) C++ conversion from a string literal to a char* 4881 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 4882 // Ideally, this check would be performed in 4883 // CheckPointerTypesForAssignment. However, that would require a 4884 // bit of refactoring (so that the second argument is an 4885 // expression, rather than a type), which should be done as part 4886 // of a larger effort to fix CheckPointerTypesForAssignment for 4887 // C++ semantics. 4888 if (getLangOptions().CPlusPlus && 4889 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 4890 return false; 4891 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 4892 break; 4893 case IntToBlockPointer: 4894 DiagKind = diag::err_int_to_block_pointer; 4895 break; 4896 case IncompatibleBlockPointer: 4897 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 4898 break; 4899 case IncompatibleObjCQualifiedId: 4900 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 4901 // it can give a more specific diagnostic. 4902 DiagKind = diag::warn_incompatible_qualified_id; 4903 break; 4904 case IncompatibleVectors: 4905 DiagKind = diag::warn_incompatible_vectors; 4906 break; 4907 case Incompatible: 4908 DiagKind = diag::err_typecheck_convert_incompatible; 4909 isInvalid = true; 4910 break; 4911 } 4912 4913 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 4914 << SrcExpr->getSourceRange(); 4915 return isInvalid; 4916} 4917 4918bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 4919{ 4920 Expr::EvalResult EvalResult; 4921 4922 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 4923 EvalResult.HasSideEffects) { 4924 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 4925 4926 if (EvalResult.Diag) { 4927 // We only show the note if it's not the usual "invalid subexpression" 4928 // or if it's actually in a subexpression. 4929 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 4930 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 4931 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4932 } 4933 4934 return true; 4935 } 4936 4937 if (EvalResult.Diag) { 4938 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 4939 E->getSourceRange(); 4940 4941 // Print the reason it's not a constant. 4942 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4943 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4944 } 4945 4946 if (Result) 4947 *Result = EvalResult.Val.getInt(); 4948 return false; 4949} 4950