SemaExpr.cpp revision 35183aca180a2b9b2c637cd625a40a7e147d6a32
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(MD->getSelector(), 62 MD->isInstanceMethod()); 63 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); 64 } 65 } 66 } 67 68 if (!isSilenced) 69 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 70 } 71 72 // See if this is a deleted function. 73 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 74 if (FD->isDeleted()) { 75 Diag(Loc, diag::err_deleted_function_use); 76 Diag(D->getLocation(), diag::note_unavailable_here) << true; 77 return true; 78 } 79 } 80 81 // See if the decl is unavailable 82 if (D->getAttr<UnavailableAttr>()) { 83 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 84 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 85 } 86 87 if (D->getDeclContext()->isFunctionOrMethod() && 88 !D->getDeclContext()->Encloses(CurContext)) { 89 // We've found the name of a function or variable that was 90 // declared with external linkage within another function (and, 91 // therefore, a scope where we wouldn't normally see the 92 // declaration). Once we've made sure that no previous declaration 93 // was properly made visible, produce a warning. 94 bool HasGlobalScopedDeclaration = false; 95 for (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D); FD; 96 FD = FD->getPreviousDeclaration()) { 97 if (FD->getDeclContext()->isFileContext()) { 98 HasGlobalScopedDeclaration = true; 99 break; 100 } 101 } 102 // FIXME: do the same thing for variable declarations 103 104 if (!HasGlobalScopedDeclaration) { 105 Diag(Loc, diag::warn_use_out_of_scope_declaration) << D; 106 Diag(D->getLocation(), diag::note_previous_declaration); 107 } 108 } 109 110 return false; 111} 112 113SourceRange Sema::getExprRange(ExprTy *E) const { 114 Expr *Ex = (Expr *)E; 115 return Ex? Ex->getSourceRange() : SourceRange(); 116} 117 118//===----------------------------------------------------------------------===// 119// Standard Promotions and Conversions 120//===----------------------------------------------------------------------===// 121 122/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 123void Sema::DefaultFunctionArrayConversion(Expr *&E) { 124 QualType Ty = E->getType(); 125 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 126 127 if (Ty->isFunctionType()) 128 ImpCastExprToType(E, Context.getPointerType(Ty)); 129 else if (Ty->isArrayType()) { 130 // In C90 mode, arrays only promote to pointers if the array expression is 131 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 132 // type 'array of type' is converted to an expression that has type 'pointer 133 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 134 // that has type 'array of type' ...". The relevant change is "an lvalue" 135 // (C90) to "an expression" (C99). 136 // 137 // C++ 4.2p1: 138 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 139 // T" can be converted to an rvalue of type "pointer to T". 140 // 141 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 142 E->isLvalue(Context) == Expr::LV_Valid) 143 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 144 } 145} 146 147/// UsualUnaryConversions - Performs various conversions that are common to most 148/// operators (C99 6.3). The conversions of array and function types are 149/// sometimes surpressed. For example, the array->pointer conversion doesn't 150/// apply if the array is an argument to the sizeof or address (&) operators. 151/// In these instances, this routine should *not* be called. 152Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 153 QualType Ty = Expr->getType(); 154 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 155 156 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 157 ImpCastExprToType(Expr, Context.IntTy); 158 else 159 DefaultFunctionArrayConversion(Expr); 160 161 return Expr; 162} 163 164/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 165/// do not have a prototype. Arguments that have type float are promoted to 166/// double. All other argument types are converted by UsualUnaryConversions(). 167void Sema::DefaultArgumentPromotion(Expr *&Expr) { 168 QualType Ty = Expr->getType(); 169 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 170 171 // If this is a 'float' (CVR qualified or typedef) promote to double. 172 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 173 if (BT->getKind() == BuiltinType::Float) 174 return ImpCastExprToType(Expr, Context.DoubleTy); 175 176 UsualUnaryConversions(Expr); 177} 178 179// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 180// will warn if the resulting type is not a POD type. 181void Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 182 DefaultArgumentPromotion(Expr); 183 184 if (!Expr->getType()->isPODType()) { 185 Diag(Expr->getLocStart(), 186 diag::warn_cannot_pass_non_pod_arg_to_vararg) << 187 Expr->getType() << CT; 188 } 189} 190 191 192/// UsualArithmeticConversions - Performs various conversions that are common to 193/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 194/// routine returns the first non-arithmetic type found. The client is 195/// responsible for emitting appropriate error diagnostics. 196/// FIXME: verify the conversion rules for "complex int" are consistent with 197/// GCC. 198QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 199 bool isCompAssign) { 200 if (!isCompAssign) { 201 UsualUnaryConversions(lhsExpr); 202 UsualUnaryConversions(rhsExpr); 203 } 204 205 // For conversion purposes, we ignore any qualifiers. 206 // For example, "const float" and "float" are equivalent. 207 QualType lhs = 208 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 209 QualType rhs = 210 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 211 212 // If both types are identical, no conversion is needed. 213 if (lhs == rhs) 214 return lhs; 215 216 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 217 // The caller can deal with this (e.g. pointer + int). 218 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 219 return lhs; 220 221 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 222 if (!isCompAssign) { 223 ImpCastExprToType(lhsExpr, destType); 224 ImpCastExprToType(rhsExpr, destType); 225 } 226 return destType; 227} 228 229QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 230 // Perform the usual unary conversions. We do this early so that 231 // integral promotions to "int" can allow us to exit early, in the 232 // lhs == rhs check. Also, for conversion purposes, we ignore any 233 // qualifiers. For example, "const float" and "float" are 234 // equivalent. 235 if (lhs->isPromotableIntegerType()) 236 lhs = Context.IntTy; 237 else 238 lhs = lhs.getUnqualifiedType(); 239 if (rhs->isPromotableIntegerType()) 240 rhs = Context.IntTy; 241 else 242 rhs = rhs.getUnqualifiedType(); 243 244 // If both types are identical, no conversion is needed. 245 if (lhs == rhs) 246 return lhs; 247 248 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 249 // The caller can deal with this (e.g. pointer + int). 250 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 251 return lhs; 252 253 // At this point, we have two different arithmetic types. 254 255 // Handle complex types first (C99 6.3.1.8p1). 256 if (lhs->isComplexType() || rhs->isComplexType()) { 257 // if we have an integer operand, the result is the complex type. 258 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 259 // convert the rhs to the lhs complex type. 260 return lhs; 261 } 262 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 263 // convert the lhs to the rhs complex type. 264 return rhs; 265 } 266 // This handles complex/complex, complex/float, or float/complex. 267 // When both operands are complex, the shorter operand is converted to the 268 // type of the longer, and that is the type of the result. This corresponds 269 // to what is done when combining two real floating-point operands. 270 // The fun begins when size promotion occur across type domains. 271 // From H&S 6.3.4: When one operand is complex and the other is a real 272 // floating-point type, the less precise type is converted, within it's 273 // real or complex domain, to the precision of the other type. For example, 274 // when combining a "long double" with a "double _Complex", the 275 // "double _Complex" is promoted to "long double _Complex". 276 int result = Context.getFloatingTypeOrder(lhs, rhs); 277 278 if (result > 0) { // The left side is bigger, convert rhs. 279 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 280 } else if (result < 0) { // The right side is bigger, convert lhs. 281 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 282 } 283 // At this point, lhs and rhs have the same rank/size. Now, make sure the 284 // domains match. This is a requirement for our implementation, C99 285 // does not require this promotion. 286 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 287 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 288 return rhs; 289 } else { // handle "_Complex double, double". 290 return lhs; 291 } 292 } 293 return lhs; // The domain/size match exactly. 294 } 295 // Now handle "real" floating types (i.e. float, double, long double). 296 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 297 // if we have an integer operand, the result is the real floating type. 298 if (rhs->isIntegerType()) { 299 // convert rhs to the lhs floating point type. 300 return lhs; 301 } 302 if (rhs->isComplexIntegerType()) { 303 // convert rhs to the complex floating point type. 304 return Context.getComplexType(lhs); 305 } 306 if (lhs->isIntegerType()) { 307 // convert lhs to the rhs floating point type. 308 return rhs; 309 } 310 if (lhs->isComplexIntegerType()) { 311 // convert lhs to the complex floating point type. 312 return Context.getComplexType(rhs); 313 } 314 // We have two real floating types, float/complex combos were handled above. 315 // Convert the smaller operand to the bigger result. 316 int result = Context.getFloatingTypeOrder(lhs, rhs); 317 if (result > 0) // convert the rhs 318 return lhs; 319 assert(result < 0 && "illegal float comparison"); 320 return rhs; // convert the lhs 321 } 322 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 323 // Handle GCC complex int extension. 324 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 325 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 326 327 if (lhsComplexInt && rhsComplexInt) { 328 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 329 rhsComplexInt->getElementType()) >= 0) 330 return lhs; // convert the rhs 331 return rhs; 332 } else if (lhsComplexInt && rhs->isIntegerType()) { 333 // convert the rhs to the lhs complex type. 334 return lhs; 335 } else if (rhsComplexInt && lhs->isIntegerType()) { 336 // convert the lhs to the rhs complex type. 337 return rhs; 338 } 339 } 340 // Finally, we have two differing integer types. 341 // The rules for this case are in C99 6.3.1.8 342 int compare = Context.getIntegerTypeOrder(lhs, rhs); 343 bool lhsSigned = lhs->isSignedIntegerType(), 344 rhsSigned = rhs->isSignedIntegerType(); 345 QualType destType; 346 if (lhsSigned == rhsSigned) { 347 // Same signedness; use the higher-ranked type 348 destType = compare >= 0 ? lhs : rhs; 349 } else if (compare != (lhsSigned ? 1 : -1)) { 350 // The unsigned type has greater than or equal rank to the 351 // signed type, so use the unsigned type 352 destType = lhsSigned ? rhs : lhs; 353 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 354 // The two types are different widths; if we are here, that 355 // means the signed type is larger than the unsigned type, so 356 // use the signed type. 357 destType = lhsSigned ? lhs : rhs; 358 } else { 359 // The signed type is higher-ranked than the unsigned type, 360 // but isn't actually any bigger (like unsigned int and long 361 // on most 32-bit systems). Use the unsigned type corresponding 362 // to the signed type. 363 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 364 } 365 return destType; 366} 367 368//===----------------------------------------------------------------------===// 369// Semantic Analysis for various Expression Types 370//===----------------------------------------------------------------------===// 371 372 373/// ActOnStringLiteral - The specified tokens were lexed as pasted string 374/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 375/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 376/// multiple tokens. However, the common case is that StringToks points to one 377/// string. 378/// 379Action::OwningExprResult 380Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 381 assert(NumStringToks && "Must have at least one string!"); 382 383 StringLiteralParser Literal(StringToks, NumStringToks, PP); 384 if (Literal.hadError) 385 return ExprError(); 386 387 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 388 for (unsigned i = 0; i != NumStringToks; ++i) 389 StringTokLocs.push_back(StringToks[i].getLocation()); 390 391 QualType StrTy = Context.CharTy; 392 if (Literal.AnyWide) StrTy = Context.getWCharType(); 393 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 394 395 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 396 if (getLangOptions().CPlusPlus) 397 StrTy.addConst(); 398 399 // Get an array type for the string, according to C99 6.4.5. This includes 400 // the nul terminator character as well as the string length for pascal 401 // strings. 402 StrTy = Context.getConstantArrayType(StrTy, 403 llvm::APInt(32, Literal.GetNumStringChars()+1), 404 ArrayType::Normal, 0); 405 406 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 407 return Owned(StringLiteral::Create(Context, Literal.GetString(), 408 Literal.GetStringLength(), 409 Literal.AnyWide, StrTy, 410 &StringTokLocs[0], 411 StringTokLocs.size())); 412} 413 414/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 415/// CurBlock to VD should cause it to be snapshotted (as we do for auto 416/// variables defined outside the block) or false if this is not needed (e.g. 417/// for values inside the block or for globals). 418/// 419/// FIXME: This will create BlockDeclRefExprs for global variables, 420/// function references, etc which is suboptimal :) and breaks 421/// things like "integer constant expression" tests. 422static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 423 ValueDecl *VD) { 424 // If the value is defined inside the block, we couldn't snapshot it even if 425 // we wanted to. 426 if (CurBlock->TheDecl == VD->getDeclContext()) 427 return false; 428 429 // If this is an enum constant or function, it is constant, don't snapshot. 430 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 431 return false; 432 433 // If this is a reference to an extern, static, or global variable, no need to 434 // snapshot it. 435 // FIXME: What about 'const' variables in C++? 436 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 437 return Var->hasLocalStorage(); 438 439 return true; 440} 441 442 443 444/// ActOnIdentifierExpr - The parser read an identifier in expression context, 445/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 446/// identifier is used in a function call context. 447/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 448/// class or namespace that the identifier must be a member of. 449Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 450 IdentifierInfo &II, 451 bool HasTrailingLParen, 452 const CXXScopeSpec *SS, 453 bool isAddressOfOperand) { 454 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 455 isAddressOfOperand); 456} 457 458/// BuildDeclRefExpr - Build either a DeclRefExpr or a 459/// QualifiedDeclRefExpr based on whether or not SS is a 460/// nested-name-specifier. 461DeclRefExpr * 462Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 463 bool TypeDependent, bool ValueDependent, 464 const CXXScopeSpec *SS) { 465 if (SS && !SS->isEmpty()) 466 return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 467 ValueDependent, 468 SS->getRange().getBegin()); 469 else 470 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 471} 472 473/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 474/// variable corresponding to the anonymous union or struct whose type 475/// is Record. 476static Decl *getObjectForAnonymousRecordDecl(RecordDecl *Record) { 477 assert(Record->isAnonymousStructOrUnion() && 478 "Record must be an anonymous struct or union!"); 479 480 // FIXME: Once Decls are directly linked together, this will 481 // be an O(1) operation rather than a slow walk through DeclContext's 482 // vector (which itself will be eliminated). DeclGroups might make 483 // this even better. 484 DeclContext *Ctx = Record->getDeclContext(); 485 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 486 DEnd = Ctx->decls_end(); 487 D != DEnd; ++D) { 488 if (*D == Record) { 489 // The object for the anonymous struct/union directly 490 // follows its type in the list of declarations. 491 ++D; 492 assert(D != DEnd && "Missing object for anonymous record"); 493 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 494 return *D; 495 } 496 } 497 498 assert(false && "Missing object for anonymous record"); 499 return 0; 500} 501 502Sema::OwningExprResult 503Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 504 FieldDecl *Field, 505 Expr *BaseObjectExpr, 506 SourceLocation OpLoc) { 507 assert(Field->getDeclContext()->isRecord() && 508 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 509 && "Field must be stored inside an anonymous struct or union"); 510 511 // Construct the sequence of field member references 512 // we'll have to perform to get to the field in the anonymous 513 // union/struct. The list of members is built from the field 514 // outward, so traverse it backwards to go from an object in 515 // the current context to the field we found. 516 llvm::SmallVector<FieldDecl *, 4> AnonFields; 517 AnonFields.push_back(Field); 518 VarDecl *BaseObject = 0; 519 DeclContext *Ctx = Field->getDeclContext(); 520 do { 521 RecordDecl *Record = cast<RecordDecl>(Ctx); 522 Decl *AnonObject = getObjectForAnonymousRecordDecl(Record); 523 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 524 AnonFields.push_back(AnonField); 525 else { 526 BaseObject = cast<VarDecl>(AnonObject); 527 break; 528 } 529 Ctx = Ctx->getParent(); 530 } while (Ctx->isRecord() && 531 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 532 533 // Build the expression that refers to the base object, from 534 // which we will build a sequence of member references to each 535 // of the anonymous union objects and, eventually, the field we 536 // found via name lookup. 537 bool BaseObjectIsPointer = false; 538 unsigned ExtraQuals = 0; 539 if (BaseObject) { 540 // BaseObject is an anonymous struct/union variable (and is, 541 // therefore, not part of another non-anonymous record). 542 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 543 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 544 SourceLocation()); 545 ExtraQuals 546 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 547 } else if (BaseObjectExpr) { 548 // The caller provided the base object expression. Determine 549 // whether its a pointer and whether it adds any qualifiers to the 550 // anonymous struct/union fields we're looking into. 551 QualType ObjectType = BaseObjectExpr->getType(); 552 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 553 BaseObjectIsPointer = true; 554 ObjectType = ObjectPtr->getPointeeType(); 555 } 556 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 557 } else { 558 // We've found a member of an anonymous struct/union that is 559 // inside a non-anonymous struct/union, so in a well-formed 560 // program our base object expression is "this". 561 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 562 if (!MD->isStatic()) { 563 QualType AnonFieldType 564 = Context.getTagDeclType( 565 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 566 QualType ThisType = Context.getTagDeclType(MD->getParent()); 567 if ((Context.getCanonicalType(AnonFieldType) 568 == Context.getCanonicalType(ThisType)) || 569 IsDerivedFrom(ThisType, AnonFieldType)) { 570 // Our base object expression is "this". 571 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 572 MD->getThisType(Context)); 573 BaseObjectIsPointer = true; 574 } 575 } else { 576 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 577 << Field->getDeclName()); 578 } 579 ExtraQuals = MD->getTypeQualifiers(); 580 } 581 582 if (!BaseObjectExpr) 583 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 584 << Field->getDeclName()); 585 } 586 587 // Build the implicit member references to the field of the 588 // anonymous struct/union. 589 Expr *Result = BaseObjectExpr; 590 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 591 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 592 FI != FIEnd; ++FI) { 593 QualType MemberType = (*FI)->getType(); 594 if (!(*FI)->isMutable()) { 595 unsigned combinedQualifiers 596 = MemberType.getCVRQualifiers() | ExtraQuals; 597 MemberType = MemberType.getQualifiedType(combinedQualifiers); 598 } 599 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 600 OpLoc, MemberType); 601 BaseObjectIsPointer = false; 602 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 603 OpLoc = SourceLocation(); 604 } 605 606 return Owned(Result); 607} 608 609/// ActOnDeclarationNameExpr - The parser has read some kind of name 610/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 611/// performs lookup on that name and returns an expression that refers 612/// to that name. This routine isn't directly called from the parser, 613/// because the parser doesn't know about DeclarationName. Rather, 614/// this routine is called by ActOnIdentifierExpr, 615/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 616/// which form the DeclarationName from the corresponding syntactic 617/// forms. 618/// 619/// HasTrailingLParen indicates whether this identifier is used in a 620/// function call context. LookupCtx is only used for a C++ 621/// qualified-id (foo::bar) to indicate the class or namespace that 622/// the identifier must be a member of. 623/// 624/// isAddressOfOperand means that this expression is the direct operand 625/// of an address-of operator. This matters because this is the only 626/// situation where a qualified name referencing a non-static member may 627/// appear outside a member function of this class. 628Sema::OwningExprResult 629Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 630 DeclarationName Name, bool HasTrailingLParen, 631 const CXXScopeSpec *SS, 632 bool isAddressOfOperand) { 633 // Could be enum-constant, value decl, instance variable, etc. 634 if (SS && SS->isInvalid()) 635 return ExprError(); 636 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 637 false, true, Loc); 638 639 NamedDecl *D = 0; 640 if (Lookup.isAmbiguous()) { 641 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 642 SS && SS->isSet() ? SS->getRange() 643 : SourceRange()); 644 return ExprError(); 645 } else 646 D = Lookup.getAsDecl(); 647 648 // If this reference is in an Objective-C method, then ivar lookup happens as 649 // well. 650 IdentifierInfo *II = Name.getAsIdentifierInfo(); 651 if (II && getCurMethodDecl()) { 652 // There are two cases to handle here. 1) scoped lookup could have failed, 653 // in which case we should look for an ivar. 2) scoped lookup could have 654 // found a decl, but that decl is outside the current method (i.e. a global 655 // variable). In these two cases, we do a lookup for an ivar with this 656 // name, if the lookup suceeds, we replace it our current decl. 657 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 658 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 659 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II)) { 660 // Check if referencing a field with __attribute__((deprecated)). 661 if (DiagnoseUseOfDecl(IV, Loc)) 662 return ExprError(); 663 664 // FIXME: This should use a new expr for a direct reference, don't turn 665 // this into Self->ivar, just return a BareIVarExpr or something. 666 IdentifierInfo &II = Context.Idents.get("self"); 667 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 668 ObjCIvarRefExpr *MRef = new (Context) ObjCIvarRefExpr(IV, IV->getType(), 669 Loc, static_cast<Expr*>(SelfExpr.release()), 670 true, true); 671 Context.setFieldDecl(IFace, IV, MRef); 672 return Owned(MRef); 673 } 674 } 675 // Needed to implement property "super.method" notation. 676 if (D == 0 && II->isStr("super")) { 677 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 678 getCurMethodDecl()->getClassInterface())); 679 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 680 } 681 } 682 683 // Determine whether this name might be a candidate for 684 // argument-dependent lookup. 685 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 686 HasTrailingLParen; 687 688 if (ADL && D == 0) { 689 // We've seen something of the form 690 // 691 // identifier( 692 // 693 // and we did not find any entity by the name 694 // "identifier". However, this identifier is still subject to 695 // argument-dependent lookup, so keep track of the name. 696 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 697 Context.OverloadTy, 698 Loc)); 699 } 700 701 if (D == 0) { 702 // Otherwise, this could be an implicitly declared function reference (legal 703 // in C90, extension in C99). 704 if (HasTrailingLParen && II && 705 !getLangOptions().CPlusPlus) // Not in C++. 706 D = ImplicitlyDefineFunction(Loc, *II, S); 707 else { 708 // If this name wasn't predeclared and if this is not a function call, 709 // diagnose the problem. 710 if (SS && !SS->isEmpty()) 711 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 712 << Name << SS->getRange()); 713 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 714 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 715 return ExprError(Diag(Loc, diag::err_undeclared_use) 716 << Name.getAsString()); 717 else 718 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 719 } 720 } 721 722 // If this is an expression of the form &Class::member, don't build an 723 // implicit member ref, because we want a pointer to the member in general, 724 // not any specific instance's member. 725 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 726 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 727 if (D && isa<CXXRecordDecl>(DC)) { 728 QualType DType; 729 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 730 DType = FD->getType().getNonReferenceType(); 731 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 732 DType = Method->getType(); 733 } else if (isa<OverloadedFunctionDecl>(D)) { 734 DType = Context.OverloadTy; 735 } 736 // Could be an inner type. That's diagnosed below, so ignore it here. 737 if (!DType.isNull()) { 738 // The pointer is type- and value-dependent if it points into something 739 // dependent. 740 bool Dependent = false; 741 for (; DC; DC = DC->getParent()) { 742 // FIXME: could stop early at namespace scope. 743 if (DC->isRecord()) { 744 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 745 if (Context.getTypeDeclType(Record)->isDependentType()) { 746 Dependent = true; 747 break; 748 } 749 } 750 } 751 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 752 } 753 } 754 } 755 756 // We may have found a field within an anonymous union or struct 757 // (C++ [class.union]). 758 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 759 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 760 return BuildAnonymousStructUnionMemberReference(Loc, FD); 761 762 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 763 if (!MD->isStatic()) { 764 // C++ [class.mfct.nonstatic]p2: 765 // [...] if name lookup (3.4.1) resolves the name in the 766 // id-expression to a nonstatic nontype member of class X or of 767 // a base class of X, the id-expression is transformed into a 768 // class member access expression (5.2.5) using (*this) (9.3.2) 769 // as the postfix-expression to the left of the '.' operator. 770 DeclContext *Ctx = 0; 771 QualType MemberType; 772 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 773 Ctx = FD->getDeclContext(); 774 MemberType = FD->getType(); 775 776 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 777 MemberType = RefType->getPointeeType(); 778 else if (!FD->isMutable()) { 779 unsigned combinedQualifiers 780 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 781 MemberType = MemberType.getQualifiedType(combinedQualifiers); 782 } 783 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 784 if (!Method->isStatic()) { 785 Ctx = Method->getParent(); 786 MemberType = Method->getType(); 787 } 788 } else if (OverloadedFunctionDecl *Ovl 789 = dyn_cast<OverloadedFunctionDecl>(D)) { 790 for (OverloadedFunctionDecl::function_iterator 791 Func = Ovl->function_begin(), 792 FuncEnd = Ovl->function_end(); 793 Func != FuncEnd; ++Func) { 794 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 795 if (!DMethod->isStatic()) { 796 Ctx = Ovl->getDeclContext(); 797 MemberType = Context.OverloadTy; 798 break; 799 } 800 } 801 } 802 803 if (Ctx && Ctx->isRecord()) { 804 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 805 QualType ThisType = Context.getTagDeclType(MD->getParent()); 806 if ((Context.getCanonicalType(CtxType) 807 == Context.getCanonicalType(ThisType)) || 808 IsDerivedFrom(ThisType, CtxType)) { 809 // Build the implicit member access expression. 810 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 811 MD->getThisType(Context)); 812 return Owned(new (Context) MemberExpr(This, true, D, 813 SourceLocation(), MemberType)); 814 } 815 } 816 } 817 } 818 819 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 820 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 821 if (MD->isStatic()) 822 // "invalid use of member 'x' in static member function" 823 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 824 << FD->getDeclName()); 825 } 826 827 // Any other ways we could have found the field in a well-formed 828 // program would have been turned into implicit member expressions 829 // above. 830 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 831 << FD->getDeclName()); 832 } 833 834 if (isa<TypedefDecl>(D)) 835 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 836 if (isa<ObjCInterfaceDecl>(D)) 837 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 838 if (isa<NamespaceDecl>(D)) 839 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 840 841 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 842 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 843 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 844 false, false, SS)); 845 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 846 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 847 false, false, SS)); 848 ValueDecl *VD = cast<ValueDecl>(D); 849 850 // Check whether this declaration can be used. Note that we suppress 851 // this check when we're going to perform argument-dependent lookup 852 // on this function name, because this might not be the function 853 // that overload resolution actually selects. 854 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 855 return ExprError(); 856 857 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 858 // Warn about constructs like: 859 // if (void *X = foo()) { ... } else { X }. 860 // In the else block, the pointer is always false. 861 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 862 Scope *CheckS = S; 863 while (CheckS) { 864 if (CheckS->isWithinElse() && 865 CheckS->getControlParent()->isDeclScope(Var)) { 866 if (Var->getType()->isBooleanType()) 867 ExprError(Diag(Loc, diag::warn_value_always_false) 868 << Var->getDeclName()); 869 else 870 ExprError(Diag(Loc, diag::warn_value_always_zero) 871 << Var->getDeclName()); 872 break; 873 } 874 875 // Move up one more control parent to check again. 876 CheckS = CheckS->getControlParent(); 877 if (CheckS) 878 CheckS = CheckS->getParent(); 879 } 880 } 881 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 882 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 883 // C99 DR 316 says that, if a function type comes from a 884 // function definition (without a prototype), that type is only 885 // used for checking compatibility. Therefore, when referencing 886 // the function, we pretend that we don't have the full function 887 // type. 888 QualType T = Func->getType(); 889 QualType NoProtoType = T; 890 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 891 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 892 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 893 } 894 } 895 896 // Only create DeclRefExpr's for valid Decl's. 897 if (VD->isInvalidDecl()) 898 return ExprError(); 899 900 // If the identifier reference is inside a block, and it refers to a value 901 // that is outside the block, create a BlockDeclRefExpr instead of a 902 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 903 // the block is formed. 904 // 905 // We do not do this for things like enum constants, global variables, etc, 906 // as they do not get snapshotted. 907 // 908 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 909 // Blocks that have these can't be constant. 910 CurBlock->hasBlockDeclRefExprs = true; 911 912 // The BlocksAttr indicates the variable is bound by-reference. 913 if (VD->getAttr<BlocksAttr>()) 914 return Owned(new (Context) BlockDeclRefExpr(VD, 915 VD->getType().getNonReferenceType(), Loc, true)); 916 917 // Variable will be bound by-copy, make it const within the closure. 918 VD->getType().addConst(); 919 return Owned(new (Context) BlockDeclRefExpr(VD, 920 VD->getType().getNonReferenceType(), Loc, false)); 921 } 922 // If this reference is not in a block or if the referenced variable is 923 // within the block, create a normal DeclRefExpr. 924 925 bool TypeDependent = false; 926 bool ValueDependent = false; 927 if (getLangOptions().CPlusPlus) { 928 // C++ [temp.dep.expr]p3: 929 // An id-expression is type-dependent if it contains: 930 // - an identifier that was declared with a dependent type, 931 if (VD->getType()->isDependentType()) 932 TypeDependent = true; 933 // - FIXME: a template-id that is dependent, 934 // - a conversion-function-id that specifies a dependent type, 935 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 936 Name.getCXXNameType()->isDependentType()) 937 TypeDependent = true; 938 // - a nested-name-specifier that contains a class-name that 939 // names a dependent type. 940 else if (SS && !SS->isEmpty()) { 941 for (DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 942 DC; DC = DC->getParent()) { 943 // FIXME: could stop early at namespace scope. 944 if (DC->isRecord()) { 945 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 946 if (Context.getTypeDeclType(Record)->isDependentType()) { 947 TypeDependent = true; 948 break; 949 } 950 } 951 } 952 } 953 954 // C++ [temp.dep.constexpr]p2: 955 // 956 // An identifier is value-dependent if it is: 957 // - a name declared with a dependent type, 958 if (TypeDependent) 959 ValueDependent = true; 960 // - the name of a non-type template parameter, 961 else if (isa<NonTypeTemplateParmDecl>(VD)) 962 ValueDependent = true; 963 // - a constant with integral or enumeration type and is 964 // initialized with an expression that is value-dependent 965 // (FIXME!). 966 } 967 968 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 969 TypeDependent, ValueDependent, SS)); 970} 971 972Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 973 tok::TokenKind Kind) { 974 PredefinedExpr::IdentType IT; 975 976 switch (Kind) { 977 default: assert(0 && "Unknown simple primary expr!"); 978 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 979 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 980 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 981 } 982 983 // Pre-defined identifiers are of type char[x], where x is the length of the 984 // string. 985 unsigned Length; 986 if (FunctionDecl *FD = getCurFunctionDecl()) 987 Length = FD->getIdentifier()->getLength(); 988 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 989 Length = MD->getSynthesizedMethodSize(); 990 else { 991 Diag(Loc, diag::ext_predef_outside_function); 992 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 993 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 994 } 995 996 997 llvm::APInt LengthI(32, Length + 1); 998 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 999 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1000 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1001} 1002 1003Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1004 llvm::SmallString<16> CharBuffer; 1005 CharBuffer.resize(Tok.getLength()); 1006 const char *ThisTokBegin = &CharBuffer[0]; 1007 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1008 1009 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1010 Tok.getLocation(), PP); 1011 if (Literal.hadError()) 1012 return ExprError(); 1013 1014 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1015 1016 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1017 Literal.isWide(), 1018 type, Tok.getLocation())); 1019} 1020 1021Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1022 // Fast path for a single digit (which is quite common). A single digit 1023 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1024 if (Tok.getLength() == 1) { 1025 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1026 unsigned IntSize = Context.Target.getIntWidth(); 1027 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1028 Context.IntTy, Tok.getLocation())); 1029 } 1030 1031 llvm::SmallString<512> IntegerBuffer; 1032 // Add padding so that NumericLiteralParser can overread by one character. 1033 IntegerBuffer.resize(Tok.getLength()+1); 1034 const char *ThisTokBegin = &IntegerBuffer[0]; 1035 1036 // Get the spelling of the token, which eliminates trigraphs, etc. 1037 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1038 1039 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1040 Tok.getLocation(), PP); 1041 if (Literal.hadError) 1042 return ExprError(); 1043 1044 Expr *Res; 1045 1046 if (Literal.isFloatingLiteral()) { 1047 QualType Ty; 1048 if (Literal.isFloat) 1049 Ty = Context.FloatTy; 1050 else if (!Literal.isLong) 1051 Ty = Context.DoubleTy; 1052 else 1053 Ty = Context.LongDoubleTy; 1054 1055 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1056 1057 // isExact will be set by GetFloatValue(). 1058 bool isExact = false; 1059 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1060 &isExact, Ty, Tok.getLocation()); 1061 1062 } else if (!Literal.isIntegerLiteral()) { 1063 return ExprError(); 1064 } else { 1065 QualType Ty; 1066 1067 // long long is a C99 feature. 1068 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1069 Literal.isLongLong) 1070 Diag(Tok.getLocation(), diag::ext_longlong); 1071 1072 // Get the value in the widest-possible width. 1073 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1074 1075 if (Literal.GetIntegerValue(ResultVal)) { 1076 // If this value didn't fit into uintmax_t, warn and force to ull. 1077 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1078 Ty = Context.UnsignedLongLongTy; 1079 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1080 "long long is not intmax_t?"); 1081 } else { 1082 // If this value fits into a ULL, try to figure out what else it fits into 1083 // according to the rules of C99 6.4.4.1p5. 1084 1085 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1086 // be an unsigned int. 1087 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1088 1089 // Check from smallest to largest, picking the smallest type we can. 1090 unsigned Width = 0; 1091 if (!Literal.isLong && !Literal.isLongLong) { 1092 // Are int/unsigned possibilities? 1093 unsigned IntSize = Context.Target.getIntWidth(); 1094 1095 // Does it fit in a unsigned int? 1096 if (ResultVal.isIntN(IntSize)) { 1097 // Does it fit in a signed int? 1098 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1099 Ty = Context.IntTy; 1100 else if (AllowUnsigned) 1101 Ty = Context.UnsignedIntTy; 1102 Width = IntSize; 1103 } 1104 } 1105 1106 // Are long/unsigned long possibilities? 1107 if (Ty.isNull() && !Literal.isLongLong) { 1108 unsigned LongSize = Context.Target.getLongWidth(); 1109 1110 // Does it fit in a unsigned long? 1111 if (ResultVal.isIntN(LongSize)) { 1112 // Does it fit in a signed long? 1113 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1114 Ty = Context.LongTy; 1115 else if (AllowUnsigned) 1116 Ty = Context.UnsignedLongTy; 1117 Width = LongSize; 1118 } 1119 } 1120 1121 // Finally, check long long if needed. 1122 if (Ty.isNull()) { 1123 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1124 1125 // Does it fit in a unsigned long long? 1126 if (ResultVal.isIntN(LongLongSize)) { 1127 // Does it fit in a signed long long? 1128 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1129 Ty = Context.LongLongTy; 1130 else if (AllowUnsigned) 1131 Ty = Context.UnsignedLongLongTy; 1132 Width = LongLongSize; 1133 } 1134 } 1135 1136 // If we still couldn't decide a type, we probably have something that 1137 // does not fit in a signed long long, but has no U suffix. 1138 if (Ty.isNull()) { 1139 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1140 Ty = Context.UnsignedLongLongTy; 1141 Width = Context.Target.getLongLongWidth(); 1142 } 1143 1144 if (ResultVal.getBitWidth() != Width) 1145 ResultVal.trunc(Width); 1146 } 1147 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1148 } 1149 1150 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1151 if (Literal.isImaginary) 1152 Res = new (Context) ImaginaryLiteral(Res, 1153 Context.getComplexType(Res->getType())); 1154 1155 return Owned(Res); 1156} 1157 1158Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1159 SourceLocation R, ExprArg Val) { 1160 Expr *E = (Expr *)Val.release(); 1161 assert((E != 0) && "ActOnParenExpr() missing expr"); 1162 return Owned(new (Context) ParenExpr(L, R, E)); 1163} 1164 1165/// The UsualUnaryConversions() function is *not* called by this routine. 1166/// See C99 6.3.2.1p[2-4] for more details. 1167bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1168 SourceLocation OpLoc, 1169 const SourceRange &ExprRange, 1170 bool isSizeof) { 1171 if (exprType->isDependentType()) 1172 return false; 1173 1174 // C99 6.5.3.4p1: 1175 if (isa<FunctionType>(exprType)) { 1176 // alignof(function) is allowed. 1177 if (isSizeof) 1178 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1179 return false; 1180 } 1181 1182 if (exprType->isVoidType()) { 1183 Diag(OpLoc, diag::ext_sizeof_void_type) 1184 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1185 return false; 1186 } 1187 1188 return DiagnoseIncompleteType(OpLoc, exprType, 1189 isSizeof ? diag::err_sizeof_incomplete_type : 1190 diag::err_alignof_incomplete_type, 1191 ExprRange); 1192} 1193 1194bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1195 const SourceRange &ExprRange) { 1196 E = E->IgnoreParens(); 1197 1198 // alignof decl is always ok. 1199 if (isa<DeclRefExpr>(E)) 1200 return false; 1201 1202 // Cannot know anything else if the expression is dependent. 1203 if (E->isTypeDependent()) 1204 return false; 1205 1206 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1207 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { 1208 if (FD->isBitField()) { 1209 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1210 return true; 1211 } 1212 // Other fields are ok. 1213 return false; 1214 } 1215 } 1216 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1217} 1218 1219/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1220/// the same for @c alignof and @c __alignof 1221/// Note that the ArgRange is invalid if isType is false. 1222Action::OwningExprResult 1223Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1224 void *TyOrEx, const SourceRange &ArgRange) { 1225 // If error parsing type, ignore. 1226 if (TyOrEx == 0) return ExprError(); 1227 1228 QualType ArgTy; 1229 SourceRange Range; 1230 if (isType) { 1231 ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1232 Range = ArgRange; 1233 1234 // Verify that the operand is valid. 1235 if (CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, isSizeof)) 1236 return ExprError(); 1237 } else { 1238 // Get the end location. 1239 Expr *ArgEx = (Expr *)TyOrEx; 1240 Range = ArgEx->getSourceRange(); 1241 ArgTy = ArgEx->getType(); 1242 1243 // Verify that the operand is valid. 1244 bool isInvalid; 1245 if (!isSizeof) { 1246 isInvalid = CheckAlignOfExpr(ArgEx, OpLoc, Range); 1247 } else if (ArgEx->isBitField()) { // C99 6.5.3.4p1. 1248 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1249 isInvalid = true; 1250 } else { 1251 isInvalid = CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, true); 1252 } 1253 1254 if (isInvalid) { 1255 DeleteExpr(ArgEx); 1256 return ExprError(); 1257 } 1258 } 1259 1260 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1261 return Owned(new (Context) SizeOfAlignOfExpr(isSizeof, isType, TyOrEx, 1262 Context.getSizeType(), OpLoc, 1263 Range.getEnd())); 1264} 1265 1266QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1267 if (V->isTypeDependent()) 1268 return Context.DependentTy; 1269 1270 DefaultFunctionArrayConversion(V); 1271 1272 // These operators return the element type of a complex type. 1273 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1274 return CT->getElementType(); 1275 1276 // Otherwise they pass through real integer and floating point types here. 1277 if (V->getType()->isArithmeticType()) 1278 return V->getType(); 1279 1280 // Reject anything else. 1281 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1282 << (isReal ? "__real" : "__imag"); 1283 return QualType(); 1284} 1285 1286 1287 1288Action::OwningExprResult 1289Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1290 tok::TokenKind Kind, ExprArg Input) { 1291 Expr *Arg = (Expr *)Input.get(); 1292 1293 UnaryOperator::Opcode Opc; 1294 switch (Kind) { 1295 default: assert(0 && "Unknown unary op!"); 1296 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1297 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1298 } 1299 1300 if (getLangOptions().CPlusPlus && 1301 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1302 // Which overloaded operator? 1303 OverloadedOperatorKind OverOp = 1304 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1305 1306 // C++ [over.inc]p1: 1307 // 1308 // [...] If the function is a member function with one 1309 // parameter (which shall be of type int) or a non-member 1310 // function with two parameters (the second of which shall be 1311 // of type int), it defines the postfix increment operator ++ 1312 // for objects of that type. When the postfix increment is 1313 // called as a result of using the ++ operator, the int 1314 // argument will have value zero. 1315 Expr *Args[2] = { 1316 Arg, 1317 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1318 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1319 }; 1320 1321 // Build the candidate set for overloading 1322 OverloadCandidateSet CandidateSet; 1323 if (AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet)) 1324 return ExprError(); 1325 1326 // Perform overload resolution. 1327 OverloadCandidateSet::iterator Best; 1328 switch (BestViableFunction(CandidateSet, Best)) { 1329 case OR_Success: { 1330 // We found a built-in operator or an overloaded operator. 1331 FunctionDecl *FnDecl = Best->Function; 1332 1333 if (FnDecl) { 1334 // We matched an overloaded operator. Build a call to that 1335 // operator. 1336 1337 // Convert the arguments. 1338 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1339 if (PerformObjectArgumentInitialization(Arg, Method)) 1340 return ExprError(); 1341 } else { 1342 // Convert the arguments. 1343 if (PerformCopyInitialization(Arg, 1344 FnDecl->getParamDecl(0)->getType(), 1345 "passing")) 1346 return ExprError(); 1347 } 1348 1349 // Determine the result type 1350 QualType ResultTy 1351 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1352 ResultTy = ResultTy.getNonReferenceType(); 1353 1354 // Build the actual expression node. 1355 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1356 SourceLocation()); 1357 UsualUnaryConversions(FnExpr); 1358 1359 Input.release(); 1360 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 1361 ResultTy, OpLoc)); 1362 } else { 1363 // We matched a built-in operator. Convert the arguments, then 1364 // break out so that we will build the appropriate built-in 1365 // operator node. 1366 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1367 "passing")) 1368 return ExprError(); 1369 1370 break; 1371 } 1372 } 1373 1374 case OR_No_Viable_Function: 1375 // No viable function; fall through to handling this as a 1376 // built-in operator, which will produce an error message for us. 1377 break; 1378 1379 case OR_Ambiguous: 1380 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1381 << UnaryOperator::getOpcodeStr(Opc) 1382 << Arg->getSourceRange(); 1383 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1384 return ExprError(); 1385 1386 case OR_Deleted: 1387 Diag(OpLoc, diag::err_ovl_deleted_oper) 1388 << Best->Function->isDeleted() 1389 << UnaryOperator::getOpcodeStr(Opc) 1390 << Arg->getSourceRange(); 1391 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1392 return ExprError(); 1393 } 1394 1395 // Either we found no viable overloaded operator or we matched a 1396 // built-in operator. In either case, fall through to trying to 1397 // build a built-in operation. 1398 } 1399 1400 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1401 Opc == UnaryOperator::PostInc); 1402 if (result.isNull()) 1403 return ExprError(); 1404 Input.release(); 1405 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1406} 1407 1408Action::OwningExprResult 1409Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1410 ExprArg Idx, SourceLocation RLoc) { 1411 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1412 *RHSExp = static_cast<Expr*>(Idx.get()); 1413 1414 if (getLangOptions().CPlusPlus && 1415 (LHSExp->getType()->isRecordType() || 1416 LHSExp->getType()->isEnumeralType() || 1417 RHSExp->getType()->isRecordType() || 1418 RHSExp->getType()->isEnumeralType())) { 1419 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1420 // to the candidate set. 1421 OverloadCandidateSet CandidateSet; 1422 Expr *Args[2] = { LHSExp, RHSExp }; 1423 if (AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1424 SourceRange(LLoc, RLoc))) 1425 return ExprError(); 1426 1427 // Perform overload resolution. 1428 OverloadCandidateSet::iterator Best; 1429 switch (BestViableFunction(CandidateSet, Best)) { 1430 case OR_Success: { 1431 // We found a built-in operator or an overloaded operator. 1432 FunctionDecl *FnDecl = Best->Function; 1433 1434 if (FnDecl) { 1435 // We matched an overloaded operator. Build a call to that 1436 // operator. 1437 1438 // Convert the arguments. 1439 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1440 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1441 PerformCopyInitialization(RHSExp, 1442 FnDecl->getParamDecl(0)->getType(), 1443 "passing")) 1444 return ExprError(); 1445 } else { 1446 // Convert the arguments. 1447 if (PerformCopyInitialization(LHSExp, 1448 FnDecl->getParamDecl(0)->getType(), 1449 "passing") || 1450 PerformCopyInitialization(RHSExp, 1451 FnDecl->getParamDecl(1)->getType(), 1452 "passing")) 1453 return ExprError(); 1454 } 1455 1456 // Determine the result type 1457 QualType ResultTy 1458 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1459 ResultTy = ResultTy.getNonReferenceType(); 1460 1461 // Build the actual expression node. 1462 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1463 SourceLocation()); 1464 UsualUnaryConversions(FnExpr); 1465 1466 Base.release(); 1467 Idx.release(); 1468 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 1469 ResultTy, LLoc)); 1470 } else { 1471 // We matched a built-in operator. Convert the arguments, then 1472 // break out so that we will build the appropriate built-in 1473 // operator node. 1474 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1475 "passing") || 1476 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1477 "passing")) 1478 return ExprError(); 1479 1480 break; 1481 } 1482 } 1483 1484 case OR_No_Viable_Function: 1485 // No viable function; fall through to handling this as a 1486 // built-in operator, which will produce an error message for us. 1487 break; 1488 1489 case OR_Ambiguous: 1490 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1491 << "[]" 1492 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1493 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1494 return ExprError(); 1495 1496 case OR_Deleted: 1497 Diag(LLoc, diag::err_ovl_deleted_oper) 1498 << Best->Function->isDeleted() 1499 << "[]" 1500 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1501 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1502 return ExprError(); 1503 } 1504 1505 // Either we found no viable overloaded operator or we matched a 1506 // built-in operator. In either case, fall through to trying to 1507 // build a built-in operation. 1508 } 1509 1510 // Perform default conversions. 1511 DefaultFunctionArrayConversion(LHSExp); 1512 DefaultFunctionArrayConversion(RHSExp); 1513 1514 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1515 1516 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1517 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1518 // in the subscript position. As a result, we need to derive the array base 1519 // and index from the expression types. 1520 Expr *BaseExpr, *IndexExpr; 1521 QualType ResultType; 1522 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1523 BaseExpr = LHSExp; 1524 IndexExpr = RHSExp; 1525 ResultType = Context.DependentTy; 1526 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1527 BaseExpr = LHSExp; 1528 IndexExpr = RHSExp; 1529 // FIXME: need to deal with const... 1530 ResultType = PTy->getPointeeType(); 1531 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1532 // Handle the uncommon case of "123[Ptr]". 1533 BaseExpr = RHSExp; 1534 IndexExpr = LHSExp; 1535 // FIXME: need to deal with const... 1536 ResultType = PTy->getPointeeType(); 1537 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1538 BaseExpr = LHSExp; // vectors: V[123] 1539 IndexExpr = RHSExp; 1540 1541 // FIXME: need to deal with const... 1542 ResultType = VTy->getElementType(); 1543 } else { 1544 return ExprError(Diag(LHSExp->getLocStart(), 1545 diag::err_typecheck_subscript_value) << RHSExp->getSourceRange()); 1546 } 1547 // C99 6.5.2.1p1 1548 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1549 return ExprError(Diag(IndexExpr->getLocStart(), 1550 diag::err_typecheck_subscript) << IndexExpr->getSourceRange()); 1551 1552 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 1553 // the following check catches trying to index a pointer to a function (e.g. 1554 // void (*)(int)) and pointers to incomplete types. Functions are not 1555 // objects in C99. 1556 if (!ResultType->isObjectType() && !ResultType->isDependentType()) 1557 return ExprError(Diag(BaseExpr->getLocStart(), 1558 diag::err_typecheck_subscript_not_object) 1559 << BaseExpr->getType() << BaseExpr->getSourceRange()); 1560 1561 Base.release(); 1562 Idx.release(); 1563 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1564 ResultType, RLoc)); 1565} 1566 1567QualType Sema:: 1568CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1569 IdentifierInfo &CompName, SourceLocation CompLoc) { 1570 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1571 1572 // The vector accessor can't exceed the number of elements. 1573 const char *compStr = CompName.getName(); 1574 1575 // This flag determines whether or not the component is one of the four 1576 // special names that indicate a subset of exactly half the elements are 1577 // to be selected. 1578 bool HalvingSwizzle = false; 1579 1580 // This flag determines whether or not CompName has an 's' char prefix, 1581 // indicating that it is a string of hex values to be used as vector indices. 1582 bool HexSwizzle = *compStr == 's'; 1583 1584 // Check that we've found one of the special components, or that the component 1585 // names must come from the same set. 1586 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1587 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1588 HalvingSwizzle = true; 1589 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1590 do 1591 compStr++; 1592 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1593 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1594 do 1595 compStr++; 1596 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1597 } 1598 1599 if (!HalvingSwizzle && *compStr) { 1600 // We didn't get to the end of the string. This means the component names 1601 // didn't come from the same set *or* we encountered an illegal name. 1602 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1603 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1604 return QualType(); 1605 } 1606 1607 // Ensure no component accessor exceeds the width of the vector type it 1608 // operates on. 1609 if (!HalvingSwizzle) { 1610 compStr = CompName.getName(); 1611 1612 if (HexSwizzle) 1613 compStr++; 1614 1615 while (*compStr) { 1616 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1617 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1618 << baseType << SourceRange(CompLoc); 1619 return QualType(); 1620 } 1621 } 1622 } 1623 1624 // If this is a halving swizzle, verify that the base type has an even 1625 // number of elements. 1626 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1627 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1628 << baseType << SourceRange(CompLoc); 1629 return QualType(); 1630 } 1631 1632 // The component accessor looks fine - now we need to compute the actual type. 1633 // The vector type is implied by the component accessor. For example, 1634 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1635 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1636 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1637 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1638 : CompName.getLength(); 1639 if (HexSwizzle) 1640 CompSize--; 1641 1642 if (CompSize == 1) 1643 return vecType->getElementType(); 1644 1645 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1646 // Now look up the TypeDefDecl from the vector type. Without this, 1647 // diagostics look bad. We want extended vector types to appear built-in. 1648 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1649 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1650 return Context.getTypedefType(ExtVectorDecls[i]); 1651 } 1652 return VT; // should never get here (a typedef type should always be found). 1653} 1654 1655 1656/// constructSetterName - Return the setter name for the given 1657/// identifier, i.e. "set" + Name where the initial character of Name 1658/// has been capitalized. 1659// FIXME: Merge with same routine in Parser. But where should this 1660// live? 1661static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 1662 const IdentifierInfo *Name) { 1663 llvm::SmallString<100> SelectorName; 1664 SelectorName = "set"; 1665 SelectorName.append(Name->getName(), Name->getName()+Name->getLength()); 1666 SelectorName[3] = toupper(SelectorName[3]); 1667 return &Idents.get(&SelectorName[0], &SelectorName[SelectorName.size()]); 1668} 1669 1670Action::OwningExprResult 1671Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1672 tok::TokenKind OpKind, SourceLocation MemberLoc, 1673 IdentifierInfo &Member) { 1674 Expr *BaseExpr = static_cast<Expr *>(Base.release()); 1675 assert(BaseExpr && "no record expression"); 1676 1677 // Perform default conversions. 1678 DefaultFunctionArrayConversion(BaseExpr); 1679 1680 QualType BaseType = BaseExpr->getType(); 1681 assert(!BaseType.isNull() && "no type for member expression"); 1682 1683 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1684 // must have pointer type, and the accessed type is the pointee. 1685 if (OpKind == tok::arrow) { 1686 if (const PointerType *PT = BaseType->getAsPointerType()) 1687 BaseType = PT->getPointeeType(); 1688 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1689 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1690 MemberLoc, Member)); 1691 else 1692 return ExprError(Diag(MemberLoc, 1693 diag::err_typecheck_member_reference_arrow) 1694 << BaseType << BaseExpr->getSourceRange()); 1695 } 1696 1697 // Handle field access to simple records. This also handles access to fields 1698 // of the ObjC 'id' struct. 1699 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1700 RecordDecl *RDecl = RTy->getDecl(); 1701 if (DiagnoseIncompleteType(OpLoc, BaseType, 1702 diag::err_typecheck_incomplete_tag, 1703 BaseExpr->getSourceRange())) 1704 return ExprError(); 1705 1706 // The record definition is complete, now make sure the member is valid. 1707 // FIXME: Qualified name lookup for C++ is a bit more complicated 1708 // than this. 1709 LookupResult Result 1710 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1711 LookupMemberName, false); 1712 1713 NamedDecl *MemberDecl = 0; 1714 if (!Result) 1715 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1716 << &Member << BaseExpr->getSourceRange()); 1717 else if (Result.isAmbiguous()) { 1718 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1719 MemberLoc, BaseExpr->getSourceRange()); 1720 return ExprError(); 1721 } else 1722 MemberDecl = Result; 1723 1724 // If the decl being referenced had an error, return an error for this 1725 // sub-expr without emitting another error, in order to avoid cascading 1726 // error cases. 1727 if (MemberDecl->isInvalidDecl()) 1728 return ExprError(); 1729 1730 // Check the use of this field 1731 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 1732 return ExprError(); 1733 1734 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1735 // We may have found a field within an anonymous union or struct 1736 // (C++ [class.union]). 1737 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1738 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1739 BaseExpr, OpLoc); 1740 1741 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1742 // FIXME: Handle address space modifiers 1743 QualType MemberType = FD->getType(); 1744 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1745 MemberType = Ref->getPointeeType(); 1746 else { 1747 unsigned combinedQualifiers = 1748 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1749 if (FD->isMutable()) 1750 combinedQualifiers &= ~QualType::Const; 1751 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1752 } 1753 1754 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1755 MemberLoc, MemberType)); 1756 } else if (CXXClassVarDecl *Var = dyn_cast<CXXClassVarDecl>(MemberDecl)) 1757 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1758 Var, MemberLoc, 1759 Var->getType().getNonReferenceType())); 1760 else if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 1761 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1762 MemberFn, MemberLoc, MemberFn->getType())); 1763 else if (OverloadedFunctionDecl *Ovl 1764 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 1765 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 1766 MemberLoc, Context.OverloadTy)); 1767 else if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 1768 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1769 Enum, MemberLoc, Enum->getType())); 1770 else if (isa<TypeDecl>(MemberDecl)) 1771 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 1772 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1773 1774 // We found a declaration kind that we didn't expect. This is a 1775 // generic error message that tells the user that she can't refer 1776 // to this member with '.' or '->'. 1777 return ExprError(Diag(MemberLoc, 1778 diag::err_typecheck_member_reference_unknown) 1779 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1780 } 1781 1782 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1783 // (*Obj).ivar. 1784 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1785 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) { 1786 // If the decl being referenced had an error, return an error for this 1787 // sub-expr without emitting another error, in order to avoid cascading 1788 // error cases. 1789 if (IV->isInvalidDecl()) 1790 return ExprError(); 1791 1792 // Check whether we can reference this field. 1793 if (DiagnoseUseOfDecl(IV, MemberLoc)) 1794 return ExprError(); 1795 1796 ObjCIvarRefExpr *MRef= new (Context) ObjCIvarRefExpr(IV, IV->getType(), 1797 MemberLoc, BaseExpr, 1798 OpKind == tok::arrow); 1799 Context.setFieldDecl(IFTy->getDecl(), IV, MRef); 1800 return Owned(MRef); 1801 } 1802 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1803 << IFTy->getDecl()->getDeclName() << &Member 1804 << BaseExpr->getSourceRange()); 1805 } 1806 1807 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1808 // pointer to a (potentially qualified) interface type. 1809 const PointerType *PTy; 1810 const ObjCInterfaceType *IFTy; 1811 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1812 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1813 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1814 1815 // Search for a declared property first. 1816 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) { 1817 // Check whether we can reference this property. 1818 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1819 return ExprError(); 1820 1821 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1822 MemberLoc, BaseExpr)); 1823 } 1824 1825 // Check protocols on qualified interfaces. 1826 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1827 E = IFTy->qual_end(); I != E; ++I) 1828 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1829 // Check whether we can reference this property. 1830 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1831 return ExprError(); 1832 1833 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1834 MemberLoc, BaseExpr)); 1835 } 1836 1837 // If that failed, look for an "implicit" property by seeing if the nullary 1838 // selector is implemented. 1839 1840 // FIXME: The logic for looking up nullary and unary selectors should be 1841 // shared with the code in ActOnInstanceMessage. 1842 1843 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1844 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1845 1846 // If this reference is in an @implementation, check for 'private' methods. 1847 if (!Getter) 1848 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1849 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1850 if (ObjCImplementationDecl *ImpDecl = 1851 ObjCImplementations[ClassDecl->getIdentifier()]) 1852 Getter = ImpDecl->getInstanceMethod(Sel); 1853 1854 // Look through local category implementations associated with the class. 1855 if (!Getter) { 1856 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1857 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1858 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1859 } 1860 } 1861 if (Getter) { 1862 // Check if we can reference this property. 1863 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1864 return ExprError(); 1865 1866 // If we found a getter then this may be a valid dot-reference, we 1867 // will look for the matching setter, in case it is needed. 1868 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 1869 &Member); 1870 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 1871 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1872 if (!Setter) { 1873 // If this reference is in an @implementation, also check for 'private' 1874 // methods. 1875 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1876 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1877 if (ObjCImplementationDecl *ImpDecl = 1878 ObjCImplementations[ClassDecl->getIdentifier()]) 1879 Setter = ImpDecl->getInstanceMethod(SetterSel); 1880 } 1881 // Look through local category implementations associated with the class. 1882 if (!Setter) { 1883 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 1884 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1885 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 1886 } 1887 } 1888 1889 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1890 return ExprError(); 1891 1892 // FIXME: we must check that the setter has property type. 1893 return Owned(new (Context) ObjCKVCRefExpr(Getter, Getter->getResultType(), 1894 Setter, MemberLoc, BaseExpr)); 1895 } 1896 1897 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 1898 << &Member << BaseType); 1899 } 1900 // Handle properties on qualified "id" protocols. 1901 const ObjCQualifiedIdType *QIdTy; 1902 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1903 // Check protocols on qualified interfaces. 1904 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1905 E = QIdTy->qual_end(); I != E; ++I) { 1906 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1907 // Check the use of this declaration 1908 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1909 return ExprError(); 1910 1911 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1912 MemberLoc, BaseExpr)); 1913 } 1914 // Also must look for a getter name which uses property syntax. 1915 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1916 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1917 // Check the use of this method. 1918 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 1919 return ExprError(); 1920 1921 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 1922 OMD->getResultType(), OMD, OpLoc, MemberLoc, NULL, 0)); 1923 } 1924 } 1925 1926 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 1927 << &Member << BaseType); 1928 } 1929 // Handle 'field access' to vectors, such as 'V.xx'. 1930 if (BaseType->isExtVectorType()) { 1931 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1932 if (ret.isNull()) 1933 return ExprError(); 1934 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 1935 MemberLoc)); 1936 } 1937 1938 return ExprError(Diag(MemberLoc, 1939 diag::err_typecheck_member_reference_struct_union) 1940 << BaseType << BaseExpr->getSourceRange()); 1941} 1942 1943/// ConvertArgumentsForCall - Converts the arguments specified in 1944/// Args/NumArgs to the parameter types of the function FDecl with 1945/// function prototype Proto. Call is the call expression itself, and 1946/// Fn is the function expression. For a C++ member function, this 1947/// routine does not attempt to convert the object argument. Returns 1948/// true if the call is ill-formed. 1949bool 1950Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 1951 FunctionDecl *FDecl, 1952 const FunctionProtoType *Proto, 1953 Expr **Args, unsigned NumArgs, 1954 SourceLocation RParenLoc) { 1955 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1956 // assignment, to the types of the corresponding parameter, ... 1957 unsigned NumArgsInProto = Proto->getNumArgs(); 1958 unsigned NumArgsToCheck = NumArgs; 1959 bool Invalid = false; 1960 1961 // If too few arguments are available (and we don't have default 1962 // arguments for the remaining parameters), don't make the call. 1963 if (NumArgs < NumArgsInProto) { 1964 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 1965 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 1966 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 1967 // Use default arguments for missing arguments 1968 NumArgsToCheck = NumArgsInProto; 1969 Call->setNumArgs(Context, NumArgsInProto); 1970 } 1971 1972 // If too many are passed and not variadic, error on the extras and drop 1973 // them. 1974 if (NumArgs > NumArgsInProto) { 1975 if (!Proto->isVariadic()) { 1976 Diag(Args[NumArgsInProto]->getLocStart(), 1977 diag::err_typecheck_call_too_many_args) 1978 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 1979 << SourceRange(Args[NumArgsInProto]->getLocStart(), 1980 Args[NumArgs-1]->getLocEnd()); 1981 // This deletes the extra arguments. 1982 Call->setNumArgs(Context, NumArgsInProto); 1983 Invalid = true; 1984 } 1985 NumArgsToCheck = NumArgsInProto; 1986 } 1987 1988 // Continue to check argument types (even if we have too few/many args). 1989 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1990 QualType ProtoArgType = Proto->getArgType(i); 1991 1992 Expr *Arg; 1993 if (i < NumArgs) { 1994 Arg = Args[i]; 1995 1996 // Pass the argument. 1997 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 1998 return true; 1999 } else 2000 // We already type-checked the argument, so we know it works. 2001 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2002 QualType ArgType = Arg->getType(); 2003 2004 Call->setArg(i, Arg); 2005 } 2006 2007 // If this is a variadic call, handle args passed through "...". 2008 if (Proto->isVariadic()) { 2009 VariadicCallType CallType = VariadicFunction; 2010 if (Fn->getType()->isBlockPointerType()) 2011 CallType = VariadicBlock; // Block 2012 else if (isa<MemberExpr>(Fn)) 2013 CallType = VariadicMethod; 2014 2015 // Promote the arguments (C99 6.5.2.2p7). 2016 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2017 Expr *Arg = Args[i]; 2018 DefaultVariadicArgumentPromotion(Arg, CallType); 2019 Call->setArg(i, Arg); 2020 } 2021 } 2022 2023 return Invalid; 2024} 2025 2026/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2027/// This provides the location of the left/right parens and a list of comma 2028/// locations. 2029Action::OwningExprResult 2030Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2031 MultiExprArg args, 2032 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2033 unsigned NumArgs = args.size(); 2034 Expr *Fn = static_cast<Expr *>(fn.release()); 2035 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2036 assert(Fn && "no function call expression"); 2037 FunctionDecl *FDecl = NULL; 2038 DeclarationName UnqualifiedName; 2039 2040 if (getLangOptions().CPlusPlus) { 2041 // Determine whether this is a dependent call inside a C++ template, 2042 // in which case we won't do any semantic analysis now. 2043 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 2044 bool Dependent = false; 2045 if (Fn->isTypeDependent()) 2046 Dependent = true; 2047 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2048 Dependent = true; 2049 2050 if (Dependent) 2051 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2052 Context.DependentTy, RParenLoc)); 2053 2054 // Determine whether this is a call to an object (C++ [over.call.object]). 2055 if (Fn->getType()->isRecordType()) 2056 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2057 CommaLocs, RParenLoc)); 2058 2059 // Determine whether this is a call to a member function. 2060 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2061 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2062 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2063 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2064 CommaLocs, RParenLoc)); 2065 } 2066 2067 // If we're directly calling a function, get the appropriate declaration. 2068 DeclRefExpr *DRExpr = NULL; 2069 Expr *FnExpr = Fn; 2070 bool ADL = true; 2071 while (true) { 2072 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2073 FnExpr = IcExpr->getSubExpr(); 2074 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2075 // Parentheses around a function disable ADL 2076 // (C++0x [basic.lookup.argdep]p1). 2077 ADL = false; 2078 FnExpr = PExpr->getSubExpr(); 2079 } else if (isa<UnaryOperator>(FnExpr) && 2080 cast<UnaryOperator>(FnExpr)->getOpcode() 2081 == UnaryOperator::AddrOf) { 2082 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2083 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2084 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2085 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2086 break; 2087 } else if (UnresolvedFunctionNameExpr *DepName 2088 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2089 UnqualifiedName = DepName->getName(); 2090 break; 2091 } else { 2092 // Any kind of name that does not refer to a declaration (or 2093 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2094 ADL = false; 2095 break; 2096 } 2097 } 2098 2099 OverloadedFunctionDecl *Ovl = 0; 2100 if (DRExpr) { 2101 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2102 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2103 } 2104 2105 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2106 // We don't perform ADL for implicit declarations of builtins. 2107 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2108 ADL = false; 2109 2110 // We don't perform ADL in C. 2111 if (!getLangOptions().CPlusPlus) 2112 ADL = false; 2113 2114 if (Ovl || ADL) { 2115 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2116 UnqualifiedName, LParenLoc, Args, 2117 NumArgs, CommaLocs, RParenLoc, ADL); 2118 if (!FDecl) 2119 return ExprError(); 2120 2121 // Update Fn to refer to the actual function selected. 2122 Expr *NewFn = 0; 2123 if (QualifiedDeclRefExpr *QDRExpr 2124 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2125 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2126 QDRExpr->getLocation(), 2127 false, false, 2128 QDRExpr->getSourceRange().getBegin()); 2129 else 2130 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2131 Fn->getSourceRange().getBegin()); 2132 Fn->Destroy(Context); 2133 Fn = NewFn; 2134 } 2135 } 2136 2137 // Promote the function operand. 2138 UsualUnaryConversions(Fn); 2139 2140 // Make the call expr early, before semantic checks. This guarantees cleanup 2141 // of arguments and function on error. 2142 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2143 Args, NumArgs, 2144 Context.BoolTy, 2145 RParenLoc)); 2146 2147 const FunctionType *FuncT; 2148 if (!Fn->getType()->isBlockPointerType()) { 2149 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2150 // have type pointer to function". 2151 const PointerType *PT = Fn->getType()->getAsPointerType(); 2152 if (PT == 0) 2153 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2154 << Fn->getType() << Fn->getSourceRange()); 2155 FuncT = PT->getPointeeType()->getAsFunctionType(); 2156 } else { // This is a block call. 2157 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2158 getAsFunctionType(); 2159 } 2160 if (FuncT == 0) 2161 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2162 << Fn->getType() << Fn->getSourceRange()); 2163 2164 // We know the result type of the call, set it. 2165 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2166 2167 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2168 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2169 RParenLoc)) 2170 return ExprError(); 2171 } else { 2172 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2173 2174 // Promote the arguments (C99 6.5.2.2p6). 2175 for (unsigned i = 0; i != NumArgs; i++) { 2176 Expr *Arg = Args[i]; 2177 DefaultArgumentPromotion(Arg); 2178 TheCall->setArg(i, Arg); 2179 } 2180 } 2181 2182 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2183 if (!Method->isStatic()) 2184 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2185 << Fn->getSourceRange()); 2186 2187 // Do special checking on direct calls to functions. 2188 if (FDecl) 2189 return CheckFunctionCall(FDecl, TheCall.take()); 2190 2191 return Owned(TheCall.take()); 2192} 2193 2194Action::OwningExprResult 2195Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2196 SourceLocation RParenLoc, ExprArg InitExpr) { 2197 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2198 QualType literalType = QualType::getFromOpaquePtr(Ty); 2199 // FIXME: put back this assert when initializers are worked out. 2200 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2201 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2202 2203 if (literalType->isArrayType()) { 2204 if (literalType->isVariableArrayType()) 2205 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2206 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2207 } else if (DiagnoseIncompleteType(LParenLoc, literalType, 2208 diag::err_typecheck_decl_incomplete_type, 2209 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2210 return ExprError(); 2211 2212 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2213 DeclarationName(), /*FIXME:DirectInit=*/false)) 2214 return ExprError(); 2215 2216 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2217 if (isFileScope) { // 6.5.2.5p3 2218 if (CheckForConstantInitializer(literalExpr, literalType)) 2219 return ExprError(); 2220 } 2221 InitExpr.release(); 2222 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2223 literalExpr, isFileScope)); 2224} 2225 2226Action::OwningExprResult 2227Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2228 InitListDesignations &Designators, 2229 SourceLocation RBraceLoc) { 2230 unsigned NumInit = initlist.size(); 2231 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2232 2233 // Semantic analysis for initializers is done by ActOnDeclarator() and 2234 // CheckInitializer() - it requires knowledge of the object being intialized. 2235 2236 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2237 RBraceLoc); 2238 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2239 return Owned(E); 2240} 2241 2242/// CheckCastTypes - Check type constraints for casting between types. 2243bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2244 UsualUnaryConversions(castExpr); 2245 2246 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2247 // type needs to be scalar. 2248 if (castType->isVoidType()) { 2249 // Cast to void allows any expr type. 2250 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2251 // We can't check any more until template instantiation time. 2252 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2253 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2254 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2255 (castType->isStructureType() || castType->isUnionType())) { 2256 // GCC struct/union extension: allow cast to self. 2257 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2258 << castType << castExpr->getSourceRange(); 2259 } else if (castType->isUnionType()) { 2260 // GCC cast to union extension 2261 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2262 RecordDecl::field_iterator Field, FieldEnd; 2263 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 2264 Field != FieldEnd; ++Field) { 2265 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2266 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2267 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2268 << castExpr->getSourceRange(); 2269 break; 2270 } 2271 } 2272 if (Field == FieldEnd) 2273 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2274 << castExpr->getType() << castExpr->getSourceRange(); 2275 } else { 2276 // Reject any other conversions to non-scalar types. 2277 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2278 << castType << castExpr->getSourceRange(); 2279 } 2280 } else if (!castExpr->getType()->isScalarType() && 2281 !castExpr->getType()->isVectorType()) { 2282 return Diag(castExpr->getLocStart(), 2283 diag::err_typecheck_expect_scalar_operand) 2284 << castExpr->getType() << castExpr->getSourceRange(); 2285 } else if (castExpr->getType()->isVectorType()) { 2286 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2287 return true; 2288 } else if (castType->isVectorType()) { 2289 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2290 return true; 2291 } 2292 return false; 2293} 2294 2295bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2296 assert(VectorTy->isVectorType() && "Not a vector type!"); 2297 2298 if (Ty->isVectorType() || Ty->isIntegerType()) { 2299 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2300 return Diag(R.getBegin(), 2301 Ty->isVectorType() ? 2302 diag::err_invalid_conversion_between_vectors : 2303 diag::err_invalid_conversion_between_vector_and_integer) 2304 << VectorTy << Ty << R; 2305 } else 2306 return Diag(R.getBegin(), 2307 diag::err_invalid_conversion_between_vector_and_scalar) 2308 << VectorTy << Ty << R; 2309 2310 return false; 2311} 2312 2313Action::OwningExprResult 2314Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2315 SourceLocation RParenLoc, ExprArg Op) { 2316 assert((Ty != 0) && (Op.get() != 0) && 2317 "ActOnCastExpr(): missing type or expr"); 2318 2319 Expr *castExpr = static_cast<Expr*>(Op.release()); 2320 QualType castType = QualType::getFromOpaquePtr(Ty); 2321 2322 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2323 return ExprError(); 2324 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2325 LParenLoc, RParenLoc)); 2326} 2327 2328/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2329/// In that case, lhs = cond. 2330/// C99 6.5.15 2331QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2332 SourceLocation QuestionLoc) { 2333 UsualUnaryConversions(Cond); 2334 UsualUnaryConversions(LHS); 2335 UsualUnaryConversions(RHS); 2336 QualType CondTy = Cond->getType(); 2337 QualType LHSTy = LHS->getType(); 2338 QualType RHSTy = RHS->getType(); 2339 2340 // first, check the condition. 2341 if (!Cond->isTypeDependent()) { 2342 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2343 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2344 << CondTy; 2345 return QualType(); 2346 } 2347 } 2348 2349 // Now check the two expressions. 2350 if ((LHS && LHS->isTypeDependent()) || (RHS && RHS->isTypeDependent())) 2351 return Context.DependentTy; 2352 2353 // If both operands have arithmetic type, do the usual arithmetic conversions 2354 // to find a common type: C99 6.5.15p3,5. 2355 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2356 UsualArithmeticConversions(LHS, RHS); 2357 return LHS->getType(); 2358 } 2359 2360 // If both operands are the same structure or union type, the result is that 2361 // type. 2362 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2363 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2364 if (LHSRT->getDecl() == RHSRT->getDecl()) 2365 // "If both the operands have structure or union type, the result has 2366 // that type." This implies that CV qualifiers are dropped. 2367 return LHSTy.getUnqualifiedType(); 2368 } 2369 2370 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2371 // The following || allows only one side to be void (a GCC-ism). 2372 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2373 if (!LHSTy->isVoidType()) 2374 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2375 << RHS->getSourceRange(); 2376 if (!RHSTy->isVoidType()) 2377 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2378 << LHS->getSourceRange(); 2379 ImpCastExprToType(LHS, Context.VoidTy); 2380 ImpCastExprToType(RHS, Context.VoidTy); 2381 return Context.VoidTy; 2382 } 2383 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2384 // the type of the other operand." 2385 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2386 Context.isObjCObjectPointerType(LHSTy)) && 2387 RHS->isNullPointerConstant(Context)) { 2388 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2389 return LHSTy; 2390 } 2391 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2392 Context.isObjCObjectPointerType(RHSTy)) && 2393 LHS->isNullPointerConstant(Context)) { 2394 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2395 return RHSTy; 2396 } 2397 2398 // Handle the case where both operands are pointers before we handle null 2399 // pointer constants in case both operands are null pointer constants. 2400 if (const PointerType *LHSPT = LHSTy->getAsPointerType()) { // C99 6.5.15p3,6 2401 if (const PointerType *RHSPT = RHSTy->getAsPointerType()) { 2402 // get the "pointed to" types 2403 QualType lhptee = LHSPT->getPointeeType(); 2404 QualType rhptee = RHSPT->getPointeeType(); 2405 2406 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2407 if (lhptee->isVoidType() && 2408 rhptee->isIncompleteOrObjectType()) { 2409 // Figure out necessary qualifiers (C99 6.5.15p6) 2410 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2411 QualType destType = Context.getPointerType(destPointee); 2412 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2413 ImpCastExprToType(RHS, destType); // promote to void* 2414 return destType; 2415 } 2416 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2417 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2418 QualType destType = Context.getPointerType(destPointee); 2419 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2420 ImpCastExprToType(RHS, destType); // promote to void* 2421 return destType; 2422 } 2423 2424 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2425 // Two identical pointer types are always compatible. 2426 return LHSTy; 2427 } 2428 2429 QualType compositeType = LHSTy; 2430 2431 // If either type is an Objective-C object type then check 2432 // compatibility according to Objective-C. 2433 if (Context.isObjCObjectPointerType(LHSTy) || 2434 Context.isObjCObjectPointerType(RHSTy)) { 2435 // If both operands are interfaces and either operand can be 2436 // assigned to the other, use that type as the composite 2437 // type. This allows 2438 // xxx ? (A*) a : (B*) b 2439 // where B is a subclass of A. 2440 // 2441 // Additionally, as for assignment, if either type is 'id' 2442 // allow silent coercion. Finally, if the types are 2443 // incompatible then make sure to use 'id' as the composite 2444 // type so the result is acceptable for sending messages to. 2445 2446 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2447 // It could return the composite type. 2448 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2449 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2450 if (LHSIface && RHSIface && 2451 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2452 compositeType = LHSTy; 2453 } else if (LHSIface && RHSIface && 2454 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2455 compositeType = RHSTy; 2456 } else if (Context.isObjCIdStructType(lhptee) || 2457 Context.isObjCIdStructType(rhptee)) { 2458 compositeType = Context.getObjCIdType(); 2459 } else { 2460 Diag(QuestionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2461 << LHSTy << RHSTy 2462 << LHS->getSourceRange() << RHS->getSourceRange(); 2463 QualType incompatTy = Context.getObjCIdType(); 2464 ImpCastExprToType(LHS, incompatTy); 2465 ImpCastExprToType(RHS, incompatTy); 2466 return incompatTy; 2467 } 2468 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2469 rhptee.getUnqualifiedType())) { 2470 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2471 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2472 // In this situation, we assume void* type. No especially good 2473 // reason, but this is what gcc does, and we do have to pick 2474 // to get a consistent AST. 2475 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2476 ImpCastExprToType(LHS, incompatTy); 2477 ImpCastExprToType(RHS, incompatTy); 2478 return incompatTy; 2479 } 2480 // The pointer types are compatible. 2481 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2482 // differently qualified versions of compatible types, the result type is 2483 // a pointer to an appropriately qualified version of the *composite* 2484 // type. 2485 // FIXME: Need to calculate the composite type. 2486 // FIXME: Need to add qualifiers 2487 ImpCastExprToType(LHS, compositeType); 2488 ImpCastExprToType(RHS, compositeType); 2489 return compositeType; 2490 } 2491 } 2492 2493 // Selection between block pointer types is ok as long as they are the same. 2494 if (LHSTy->isBlockPointerType() && RHSTy->isBlockPointerType() && 2495 Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) 2496 return LHSTy; 2497 2498 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2499 // evaluates to "struct objc_object *" (and is handled above when comparing 2500 // id with statically typed objects). 2501 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 2502 // GCC allows qualified id and any Objective-C type to devolve to 2503 // id. Currently localizing to here until clear this should be 2504 // part of ObjCQualifiedIdTypesAreCompatible. 2505 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 2506 (LHSTy->isObjCQualifiedIdType() && 2507 Context.isObjCObjectPointerType(RHSTy)) || 2508 (RHSTy->isObjCQualifiedIdType() && 2509 Context.isObjCObjectPointerType(LHSTy))) { 2510 // FIXME: This is not the correct composite type. This only 2511 // happens to work because id can more or less be used anywhere, 2512 // however this may change the type of method sends. 2513 // FIXME: gcc adds some type-checking of the arguments and emits 2514 // (confusing) incompatible comparison warnings in some 2515 // cases. Investigate. 2516 QualType compositeType = Context.getObjCIdType(); 2517 ImpCastExprToType(LHS, compositeType); 2518 ImpCastExprToType(RHS, compositeType); 2519 return compositeType; 2520 } 2521 } 2522 2523 // Otherwise, the operands are not compatible. 2524 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2525 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2526 return QualType(); 2527} 2528 2529/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2530/// in the case of a the GNU conditional expr extension. 2531Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2532 SourceLocation ColonLoc, 2533 ExprArg Cond, ExprArg LHS, 2534 ExprArg RHS) { 2535 Expr *CondExpr = (Expr *) Cond.get(); 2536 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2537 2538 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2539 // was the condition. 2540 bool isLHSNull = LHSExpr == 0; 2541 if (isLHSNull) 2542 LHSExpr = CondExpr; 2543 2544 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2545 RHSExpr, QuestionLoc); 2546 if (result.isNull()) 2547 return ExprError(); 2548 2549 Cond.release(); 2550 LHS.release(); 2551 RHS.release(); 2552 return Owned(new (Context) ConditionalOperator(CondExpr, 2553 isLHSNull ? 0 : LHSExpr, 2554 RHSExpr, result)); 2555} 2556 2557 2558// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2559// being closely modeled after the C99 spec:-). The odd characteristic of this 2560// routine is it effectively iqnores the qualifiers on the top level pointee. 2561// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2562// FIXME: add a couple examples in this comment. 2563Sema::AssignConvertType 2564Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2565 QualType lhptee, rhptee; 2566 2567 // get the "pointed to" type (ignoring qualifiers at the top level) 2568 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2569 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2570 2571 // make sure we operate on the canonical type 2572 lhptee = Context.getCanonicalType(lhptee); 2573 rhptee = Context.getCanonicalType(rhptee); 2574 2575 AssignConvertType ConvTy = Compatible; 2576 2577 // C99 6.5.16.1p1: This following citation is common to constraints 2578 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2579 // qualifiers of the type *pointed to* by the right; 2580 // FIXME: Handle ExtQualType 2581 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2582 ConvTy = CompatiblePointerDiscardsQualifiers; 2583 2584 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2585 // incomplete type and the other is a pointer to a qualified or unqualified 2586 // version of void... 2587 if (lhptee->isVoidType()) { 2588 if (rhptee->isIncompleteOrObjectType()) 2589 return ConvTy; 2590 2591 // As an extension, we allow cast to/from void* to function pointer. 2592 assert(rhptee->isFunctionType()); 2593 return FunctionVoidPointer; 2594 } 2595 2596 if (rhptee->isVoidType()) { 2597 if (lhptee->isIncompleteOrObjectType()) 2598 return ConvTy; 2599 2600 // As an extension, we allow cast to/from void* to function pointer. 2601 assert(lhptee->isFunctionType()); 2602 return FunctionVoidPointer; 2603 } 2604 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2605 // unqualified versions of compatible types, ... 2606 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2607 rhptee.getUnqualifiedType())) 2608 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 2609 return ConvTy; 2610} 2611 2612/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2613/// block pointer types are compatible or whether a block and normal pointer 2614/// are compatible. It is more restrict than comparing two function pointer 2615// types. 2616Sema::AssignConvertType 2617Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2618 QualType rhsType) { 2619 QualType lhptee, rhptee; 2620 2621 // get the "pointed to" type (ignoring qualifiers at the top level) 2622 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2623 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2624 2625 // make sure we operate on the canonical type 2626 lhptee = Context.getCanonicalType(lhptee); 2627 rhptee = Context.getCanonicalType(rhptee); 2628 2629 AssignConvertType ConvTy = Compatible; 2630 2631 // For blocks we enforce that qualifiers are identical. 2632 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2633 ConvTy = CompatiblePointerDiscardsQualifiers; 2634 2635 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2636 return IncompatibleBlockPointer; 2637 return ConvTy; 2638} 2639 2640/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2641/// has code to accommodate several GCC extensions when type checking 2642/// pointers. Here are some objectionable examples that GCC considers warnings: 2643/// 2644/// int a, *pint; 2645/// short *pshort; 2646/// struct foo *pfoo; 2647/// 2648/// pint = pshort; // warning: assignment from incompatible pointer type 2649/// a = pint; // warning: assignment makes integer from pointer without a cast 2650/// pint = a; // warning: assignment makes pointer from integer without a cast 2651/// pint = pfoo; // warning: assignment from incompatible pointer type 2652/// 2653/// As a result, the code for dealing with pointers is more complex than the 2654/// C99 spec dictates. 2655/// 2656Sema::AssignConvertType 2657Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2658 // Get canonical types. We're not formatting these types, just comparing 2659 // them. 2660 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2661 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2662 2663 if (lhsType == rhsType) 2664 return Compatible; // Common case: fast path an exact match. 2665 2666 // If the left-hand side is a reference type, then we are in a 2667 // (rare!) case where we've allowed the use of references in C, 2668 // e.g., as a parameter type in a built-in function. In this case, 2669 // just make sure that the type referenced is compatible with the 2670 // right-hand side type. The caller is responsible for adjusting 2671 // lhsType so that the resulting expression does not have reference 2672 // type. 2673 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2674 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2675 return Compatible; 2676 return Incompatible; 2677 } 2678 2679 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 2680 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 2681 return Compatible; 2682 // Relax integer conversions like we do for pointers below. 2683 if (rhsType->isIntegerType()) 2684 return IntToPointer; 2685 if (lhsType->isIntegerType()) 2686 return PointerToInt; 2687 return IncompatibleObjCQualifiedId; 2688 } 2689 2690 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2691 // For ExtVector, allow vector splats; float -> <n x float> 2692 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2693 if (LV->getElementType() == rhsType) 2694 return Compatible; 2695 2696 // If we are allowing lax vector conversions, and LHS and RHS are both 2697 // vectors, the total size only needs to be the same. This is a bitcast; 2698 // no bits are changed but the result type is different. 2699 if (getLangOptions().LaxVectorConversions && 2700 lhsType->isVectorType() && rhsType->isVectorType()) { 2701 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2702 return IncompatibleVectors; 2703 } 2704 return Incompatible; 2705 } 2706 2707 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2708 return Compatible; 2709 2710 if (isa<PointerType>(lhsType)) { 2711 if (rhsType->isIntegerType()) 2712 return IntToPointer; 2713 2714 if (isa<PointerType>(rhsType)) 2715 return CheckPointerTypesForAssignment(lhsType, rhsType); 2716 2717 if (rhsType->getAsBlockPointerType()) { 2718 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2719 return Compatible; 2720 2721 // Treat block pointers as objects. 2722 if (getLangOptions().ObjC1 && 2723 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2724 return Compatible; 2725 } 2726 return Incompatible; 2727 } 2728 2729 if (isa<BlockPointerType>(lhsType)) { 2730 if (rhsType->isIntegerType()) 2731 return IntToBlockPointer; 2732 2733 // Treat block pointers as objects. 2734 if (getLangOptions().ObjC1 && 2735 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2736 return Compatible; 2737 2738 if (rhsType->isBlockPointerType()) 2739 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2740 2741 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2742 if (RHSPT->getPointeeType()->isVoidType()) 2743 return Compatible; 2744 } 2745 return Incompatible; 2746 } 2747 2748 if (isa<PointerType>(rhsType)) { 2749 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2750 if (lhsType == Context.BoolTy) 2751 return Compatible; 2752 2753 if (lhsType->isIntegerType()) 2754 return PointerToInt; 2755 2756 if (isa<PointerType>(lhsType)) 2757 return CheckPointerTypesForAssignment(lhsType, rhsType); 2758 2759 if (isa<BlockPointerType>(lhsType) && 2760 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2761 return Compatible; 2762 return Incompatible; 2763 } 2764 2765 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 2766 if (Context.typesAreCompatible(lhsType, rhsType)) 2767 return Compatible; 2768 } 2769 return Incompatible; 2770} 2771 2772Sema::AssignConvertType 2773Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2774 if (getLangOptions().CPlusPlus) { 2775 if (!lhsType->isRecordType()) { 2776 // C++ 5.17p3: If the left operand is not of class type, the 2777 // expression is implicitly converted (C++ 4) to the 2778 // cv-unqualified type of the left operand. 2779 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 2780 "assigning")) 2781 return Incompatible; 2782 else 2783 return Compatible; 2784 } 2785 2786 // FIXME: Currently, we fall through and treat C++ classes like C 2787 // structures. 2788 } 2789 2790 // C99 6.5.16.1p1: the left operand is a pointer and the right is 2791 // a null pointer constant. 2792 if ((lhsType->isPointerType() || 2793 lhsType->isObjCQualifiedIdType() || 2794 lhsType->isBlockPointerType()) 2795 && rExpr->isNullPointerConstant(Context)) { 2796 ImpCastExprToType(rExpr, lhsType); 2797 return Compatible; 2798 } 2799 2800 // This check seems unnatural, however it is necessary to ensure the proper 2801 // conversion of functions/arrays. If the conversion were done for all 2802 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 2803 // expressions that surpress this implicit conversion (&, sizeof). 2804 // 2805 // Suppress this for references: C++ 8.5.3p5. 2806 if (!lhsType->isReferenceType()) 2807 DefaultFunctionArrayConversion(rExpr); 2808 2809 Sema::AssignConvertType result = 2810 CheckAssignmentConstraints(lhsType, rExpr->getType()); 2811 2812 // C99 6.5.16.1p2: The value of the right operand is converted to the 2813 // type of the assignment expression. 2814 // CheckAssignmentConstraints allows the left-hand side to be a reference, 2815 // so that we can use references in built-in functions even in C. 2816 // The getNonReferenceType() call makes sure that the resulting expression 2817 // does not have reference type. 2818 if (rExpr->getType() != lhsType) 2819 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 2820 return result; 2821} 2822 2823Sema::AssignConvertType 2824Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 2825 return CheckAssignmentConstraints(lhsType, rhsType); 2826} 2827 2828QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 2829 Diag(Loc, diag::err_typecheck_invalid_operands) 2830 << lex->getType() << rex->getType() 2831 << lex->getSourceRange() << rex->getSourceRange(); 2832 return QualType(); 2833} 2834 2835inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 2836 Expr *&rex) { 2837 // For conversion purposes, we ignore any qualifiers. 2838 // For example, "const float" and "float" are equivalent. 2839 QualType lhsType = 2840 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 2841 QualType rhsType = 2842 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 2843 2844 // If the vector types are identical, return. 2845 if (lhsType == rhsType) 2846 return lhsType; 2847 2848 // Handle the case of a vector & extvector type of the same size and element 2849 // type. It would be nice if we only had one vector type someday. 2850 if (getLangOptions().LaxVectorConversions) { 2851 // FIXME: Should we warn here? 2852 if (const VectorType *LV = lhsType->getAsVectorType()) { 2853 if (const VectorType *RV = rhsType->getAsVectorType()) 2854 if (LV->getElementType() == RV->getElementType() && 2855 LV->getNumElements() == RV->getNumElements()) { 2856 return lhsType->isExtVectorType() ? lhsType : rhsType; 2857 } 2858 } 2859 } 2860 2861 // If the lhs is an extended vector and the rhs is a scalar of the same type 2862 // or a literal, promote the rhs to the vector type. 2863 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 2864 QualType eltType = V->getElementType(); 2865 2866 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 2867 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 2868 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 2869 ImpCastExprToType(rex, lhsType); 2870 return lhsType; 2871 } 2872 } 2873 2874 // If the rhs is an extended vector and the lhs is a scalar of the same type, 2875 // promote the lhs to the vector type. 2876 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 2877 QualType eltType = V->getElementType(); 2878 2879 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 2880 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 2881 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 2882 ImpCastExprToType(lex, rhsType); 2883 return rhsType; 2884 } 2885 } 2886 2887 // You cannot convert between vector values of different size. 2888 Diag(Loc, diag::err_typecheck_vector_not_convertable) 2889 << lex->getType() << rex->getType() 2890 << lex->getSourceRange() << rex->getSourceRange(); 2891 return QualType(); 2892} 2893 2894inline QualType Sema::CheckMultiplyDivideOperands( 2895 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2896{ 2897 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2898 return CheckVectorOperands(Loc, lex, rex); 2899 2900 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2901 2902 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2903 return compType; 2904 return InvalidOperands(Loc, lex, rex); 2905} 2906 2907inline QualType Sema::CheckRemainderOperands( 2908 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2909{ 2910 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 2911 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2912 return CheckVectorOperands(Loc, lex, rex); 2913 return InvalidOperands(Loc, lex, rex); 2914 } 2915 2916 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2917 2918 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2919 return compType; 2920 return InvalidOperands(Loc, lex, rex); 2921} 2922 2923inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 2924 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2925{ 2926 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2927 return CheckVectorOperands(Loc, lex, rex); 2928 2929 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2930 2931 // handle the common case first (both operands are arithmetic). 2932 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2933 return compType; 2934 2935 // Put any potential pointer into PExp 2936 Expr* PExp = lex, *IExp = rex; 2937 if (IExp->getType()->isPointerType()) 2938 std::swap(PExp, IExp); 2939 2940 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 2941 if (IExp->getType()->isIntegerType()) { 2942 // Check for arithmetic on pointers to incomplete types 2943 if (!PTy->getPointeeType()->isObjectType()) { 2944 if (PTy->getPointeeType()->isVoidType()) { 2945 if (getLangOptions().CPlusPlus) { 2946 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 2947 << lex->getSourceRange() << rex->getSourceRange(); 2948 return QualType(); 2949 } 2950 2951 // GNU extension: arithmetic on pointer to void 2952 Diag(Loc, diag::ext_gnu_void_ptr) 2953 << lex->getSourceRange() << rex->getSourceRange(); 2954 } else if (PTy->getPointeeType()->isFunctionType()) { 2955 if (getLangOptions().CPlusPlus) { 2956 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 2957 << lex->getType() << lex->getSourceRange(); 2958 return QualType(); 2959 } 2960 2961 // GNU extension: arithmetic on pointer to function 2962 Diag(Loc, diag::ext_gnu_ptr_func_arith) 2963 << lex->getType() << lex->getSourceRange(); 2964 } else { 2965 DiagnoseIncompleteType(Loc, PTy->getPointeeType(), 2966 diag::err_typecheck_arithmetic_incomplete_type, 2967 lex->getSourceRange(), SourceRange(), 2968 lex->getType()); 2969 return QualType(); 2970 } 2971 } 2972 return PExp->getType(); 2973 } 2974 } 2975 2976 return InvalidOperands(Loc, lex, rex); 2977} 2978 2979// C99 6.5.6 2980QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 2981 SourceLocation Loc, bool isCompAssign) { 2982 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2983 return CheckVectorOperands(Loc, lex, rex); 2984 2985 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2986 2987 // Enforce type constraints: C99 6.5.6p3. 2988 2989 // Handle the common case first (both operands are arithmetic). 2990 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2991 return compType; 2992 2993 // Either ptr - int or ptr - ptr. 2994 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 2995 QualType lpointee = LHSPTy->getPointeeType(); 2996 2997 // The LHS must be an object type, not incomplete, function, etc. 2998 if (!lpointee->isObjectType()) { 2999 // Handle the GNU void* extension. 3000 if (lpointee->isVoidType()) { 3001 Diag(Loc, diag::ext_gnu_void_ptr) 3002 << lex->getSourceRange() << rex->getSourceRange(); 3003 } else if (lpointee->isFunctionType()) { 3004 if (getLangOptions().CPlusPlus) { 3005 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3006 << lex->getType() << lex->getSourceRange(); 3007 return QualType(); 3008 } 3009 3010 // GNU extension: arithmetic on pointer to function 3011 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3012 << lex->getType() << lex->getSourceRange(); 3013 } else { 3014 Diag(Loc, diag::err_typecheck_sub_ptr_object) 3015 << lex->getType() << lex->getSourceRange(); 3016 return QualType(); 3017 } 3018 } 3019 3020 // The result type of a pointer-int computation is the pointer type. 3021 if (rex->getType()->isIntegerType()) 3022 return lex->getType(); 3023 3024 // Handle pointer-pointer subtractions. 3025 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3026 QualType rpointee = RHSPTy->getPointeeType(); 3027 3028 // RHS must be an object type, unless void (GNU). 3029 if (!rpointee->isObjectType()) { 3030 // Handle the GNU void* extension. 3031 if (rpointee->isVoidType()) { 3032 if (!lpointee->isVoidType()) 3033 Diag(Loc, diag::ext_gnu_void_ptr) 3034 << lex->getSourceRange() << rex->getSourceRange(); 3035 } else if (rpointee->isFunctionType()) { 3036 if (getLangOptions().CPlusPlus) { 3037 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3038 << rex->getType() << rex->getSourceRange(); 3039 return QualType(); 3040 } 3041 3042 // GNU extension: arithmetic on pointer to function 3043 if (!lpointee->isFunctionType()) 3044 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3045 << lex->getType() << lex->getSourceRange(); 3046 } else { 3047 Diag(Loc, diag::err_typecheck_sub_ptr_object) 3048 << rex->getType() << rex->getSourceRange(); 3049 return QualType(); 3050 } 3051 } 3052 3053 // Pointee types must be compatible. 3054 if (!Context.typesAreCompatible( 3055 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3056 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3057 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3058 << lex->getType() << rex->getType() 3059 << lex->getSourceRange() << rex->getSourceRange(); 3060 return QualType(); 3061 } 3062 3063 return Context.getPointerDiffType(); 3064 } 3065 } 3066 3067 return InvalidOperands(Loc, lex, rex); 3068} 3069 3070// C99 6.5.7 3071QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3072 bool isCompAssign) { 3073 // C99 6.5.7p2: Each of the operands shall have integer type. 3074 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3075 return InvalidOperands(Loc, lex, rex); 3076 3077 // Shifts don't perform usual arithmetic conversions, they just do integer 3078 // promotions on each operand. C99 6.5.7p3 3079 if (!isCompAssign) 3080 UsualUnaryConversions(lex); 3081 UsualUnaryConversions(rex); 3082 3083 // "The type of the result is that of the promoted left operand." 3084 return lex->getType(); 3085} 3086 3087// C99 6.5.8 3088QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3089 bool isRelational) { 3090 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3091 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3092 3093 // C99 6.5.8p3 / C99 6.5.9p4 3094 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3095 UsualArithmeticConversions(lex, rex); 3096 else { 3097 UsualUnaryConversions(lex); 3098 UsualUnaryConversions(rex); 3099 } 3100 QualType lType = lex->getType(); 3101 QualType rType = rex->getType(); 3102 3103 // For non-floating point types, check for self-comparisons of the form 3104 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3105 // often indicate logic errors in the program. 3106 if (!lType->isFloatingType()) { 3107 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3108 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3109 if (DRL->getDecl() == DRR->getDecl()) 3110 Diag(Loc, diag::warn_selfcomparison); 3111 } 3112 3113 // The result of comparisons is 'bool' in C++, 'int' in C. 3114 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy : Context.IntTy; 3115 3116 if (isRelational) { 3117 if (lType->isRealType() && rType->isRealType()) 3118 return ResultTy; 3119 } else { 3120 // Check for comparisons of floating point operands using != and ==. 3121 if (lType->isFloatingType()) { 3122 assert (rType->isFloatingType()); 3123 CheckFloatComparison(Loc,lex,rex); 3124 } 3125 3126 if (lType->isArithmeticType() && rType->isArithmeticType()) 3127 return ResultTy; 3128 } 3129 3130 bool LHSIsNull = lex->isNullPointerConstant(Context); 3131 bool RHSIsNull = rex->isNullPointerConstant(Context); 3132 3133 // All of the following pointer related warnings are GCC extensions, except 3134 // when handling null pointer constants. One day, we can consider making them 3135 // errors (when -pedantic-errors is enabled). 3136 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3137 QualType LCanPointeeTy = 3138 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3139 QualType RCanPointeeTy = 3140 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3141 3142 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3143 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3144 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3145 RCanPointeeTy.getUnqualifiedType()) && 3146 !Context.areComparableObjCPointerTypes(lType, rType)) { 3147 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3148 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3149 } 3150 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3151 return ResultTy; 3152 } 3153 // Handle block pointer types. 3154 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 3155 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3156 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3157 3158 if (!LHSIsNull && !RHSIsNull && 3159 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3160 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3161 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3162 } 3163 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3164 return ResultTy; 3165 } 3166 // Allow block pointers to be compared with null pointer constants. 3167 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3168 (lType->isPointerType() && rType->isBlockPointerType())) { 3169 if (!LHSIsNull && !RHSIsNull) { 3170 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3171 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3172 } 3173 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3174 return ResultTy; 3175 } 3176 3177 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3178 if (lType->isPointerType() || rType->isPointerType()) { 3179 const PointerType *LPT = lType->getAsPointerType(); 3180 const PointerType *RPT = rType->getAsPointerType(); 3181 bool LPtrToVoid = LPT ? 3182 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3183 bool RPtrToVoid = RPT ? 3184 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3185 3186 if (!LPtrToVoid && !RPtrToVoid && 3187 !Context.typesAreCompatible(lType, rType)) { 3188 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3189 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3190 ImpCastExprToType(rex, lType); 3191 return ResultTy; 3192 } 3193 ImpCastExprToType(rex, lType); 3194 return ResultTy; 3195 } 3196 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3197 ImpCastExprToType(rex, lType); 3198 return ResultTy; 3199 } else { 3200 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3201 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3202 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3203 ImpCastExprToType(rex, lType); 3204 return ResultTy; 3205 } 3206 } 3207 } 3208 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3209 rType->isIntegerType()) { 3210 if (!RHSIsNull) 3211 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3212 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3213 ImpCastExprToType(rex, lType); // promote the integer to pointer 3214 return ResultTy; 3215 } 3216 if (lType->isIntegerType() && 3217 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3218 if (!LHSIsNull) 3219 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3220 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3221 ImpCastExprToType(lex, rType); // promote the integer to pointer 3222 return ResultTy; 3223 } 3224 // Handle block pointers. 3225 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3226 if (!RHSIsNull) 3227 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3228 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3229 ImpCastExprToType(rex, lType); // promote the integer to pointer 3230 return ResultTy; 3231 } 3232 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3233 if (!LHSIsNull) 3234 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3235 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3236 ImpCastExprToType(lex, rType); // promote the integer to pointer 3237 return ResultTy; 3238 } 3239 return InvalidOperands(Loc, lex, rex); 3240} 3241 3242/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3243/// operates on extended vector types. Instead of producing an IntTy result, 3244/// like a scalar comparison, a vector comparison produces a vector of integer 3245/// types. 3246QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3247 SourceLocation Loc, 3248 bool isRelational) { 3249 // Check to make sure we're operating on vectors of the same type and width, 3250 // Allowing one side to be a scalar of element type. 3251 QualType vType = CheckVectorOperands(Loc, lex, rex); 3252 if (vType.isNull()) 3253 return vType; 3254 3255 QualType lType = lex->getType(); 3256 QualType rType = rex->getType(); 3257 3258 // For non-floating point types, check for self-comparisons of the form 3259 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3260 // often indicate logic errors in the program. 3261 if (!lType->isFloatingType()) { 3262 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3263 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3264 if (DRL->getDecl() == DRR->getDecl()) 3265 Diag(Loc, diag::warn_selfcomparison); 3266 } 3267 3268 // Check for comparisons of floating point operands using != and ==. 3269 if (!isRelational && lType->isFloatingType()) { 3270 assert (rType->isFloatingType()); 3271 CheckFloatComparison(Loc,lex,rex); 3272 } 3273 3274 // Return the type for the comparison, which is the same as vector type for 3275 // integer vectors, or an integer type of identical size and number of 3276 // elements for floating point vectors. 3277 if (lType->isIntegerType()) 3278 return lType; 3279 3280 const VectorType *VTy = lType->getAsVectorType(); 3281 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3282 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3283 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3284 else if (TypeSize == Context.getTypeSize(Context.LongTy)) 3285 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3286 3287 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3288 "Unhandled vector element size in vector compare"); 3289 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3290} 3291 3292inline QualType Sema::CheckBitwiseOperands( 3293 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3294{ 3295 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3296 return CheckVectorOperands(Loc, lex, rex); 3297 3298 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3299 3300 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3301 return compType; 3302 return InvalidOperands(Loc, lex, rex); 3303} 3304 3305inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3306 Expr *&lex, Expr *&rex, SourceLocation Loc) 3307{ 3308 UsualUnaryConversions(lex); 3309 UsualUnaryConversions(rex); 3310 3311 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3312 return Context.IntTy; 3313 return InvalidOperands(Loc, lex, rex); 3314} 3315 3316/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3317/// is a read-only property; return true if so. A readonly property expression 3318/// depends on various declarations and thus must be treated specially. 3319/// 3320static bool IsReadonlyProperty(Expr *E, Sema &S) 3321{ 3322 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3323 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3324 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3325 QualType BaseType = PropExpr->getBase()->getType(); 3326 if (const PointerType *PTy = BaseType->getAsPointerType()) 3327 if (const ObjCInterfaceType *IFTy = 3328 PTy->getPointeeType()->getAsObjCInterfaceType()) 3329 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3330 if (S.isPropertyReadonly(PDecl, IFace)) 3331 return true; 3332 } 3333 } 3334 return false; 3335} 3336 3337/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3338/// emit an error and return true. If so, return false. 3339static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3340 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 3341 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3342 IsLV = Expr::MLV_ReadonlyProperty; 3343 if (IsLV == Expr::MLV_Valid) 3344 return false; 3345 3346 unsigned Diag = 0; 3347 bool NeedType = false; 3348 switch (IsLV) { // C99 6.5.16p2 3349 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3350 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3351 case Expr::MLV_ArrayType: 3352 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3353 NeedType = true; 3354 break; 3355 case Expr::MLV_NotObjectType: 3356 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3357 NeedType = true; 3358 break; 3359 case Expr::MLV_LValueCast: 3360 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3361 break; 3362 case Expr::MLV_InvalidExpression: 3363 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3364 break; 3365 case Expr::MLV_IncompleteType: 3366 case Expr::MLV_IncompleteVoidType: 3367 return S.DiagnoseIncompleteType(Loc, E->getType(), 3368 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3369 E->getSourceRange()); 3370 case Expr::MLV_DuplicateVectorComponents: 3371 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 3372 break; 3373 case Expr::MLV_NotBlockQualified: 3374 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 3375 break; 3376 case Expr::MLV_ReadonlyProperty: 3377 Diag = diag::error_readonly_property_assignment; 3378 break; 3379 case Expr::MLV_NoSetterProperty: 3380 Diag = diag::error_nosetter_property_assignment; 3381 break; 3382 } 3383 3384 if (NeedType) 3385 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 3386 else 3387 S.Diag(Loc, Diag) << E->getSourceRange(); 3388 return true; 3389} 3390 3391 3392 3393// C99 6.5.16.1 3394QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 3395 SourceLocation Loc, 3396 QualType CompoundType) { 3397 // Verify that LHS is a modifiable lvalue, and emit error if not. 3398 if (CheckForModifiableLvalue(LHS, Loc, *this)) 3399 return QualType(); 3400 3401 QualType LHSType = LHS->getType(); 3402 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 3403 3404 AssignConvertType ConvTy; 3405 if (CompoundType.isNull()) { 3406 // Simple assignment "x = y". 3407 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 3408 // Special case of NSObject attributes on c-style pointer types. 3409 if (ConvTy == IncompatiblePointer && 3410 ((Context.isObjCNSObjectType(LHSType) && 3411 Context.isObjCObjectPointerType(RHSType)) || 3412 (Context.isObjCNSObjectType(RHSType) && 3413 Context.isObjCObjectPointerType(LHSType)))) 3414 ConvTy = Compatible; 3415 3416 // If the RHS is a unary plus or minus, check to see if they = and + are 3417 // right next to each other. If so, the user may have typo'd "x =+ 4" 3418 // instead of "x += 4". 3419 Expr *RHSCheck = RHS; 3420 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 3421 RHSCheck = ICE->getSubExpr(); 3422 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 3423 if ((UO->getOpcode() == UnaryOperator::Plus || 3424 UO->getOpcode() == UnaryOperator::Minus) && 3425 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 3426 // Only if the two operators are exactly adjacent. 3427 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 3428 Diag(Loc, diag::warn_not_compound_assign) 3429 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 3430 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 3431 } 3432 } else { 3433 // Compound assignment "x += y" 3434 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 3435 } 3436 3437 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 3438 RHS, "assigning")) 3439 return QualType(); 3440 3441 // C99 6.5.16p3: The type of an assignment expression is the type of the 3442 // left operand unless the left operand has qualified type, in which case 3443 // it is the unqualified version of the type of the left operand. 3444 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 3445 // is converted to the type of the assignment expression (above). 3446 // C++ 5.17p1: the type of the assignment expression is that of its left 3447 // oprdu. 3448 return LHSType.getUnqualifiedType(); 3449} 3450 3451// C99 6.5.17 3452QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 3453 // FIXME: what is required for LHS? 3454 3455 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 3456 DefaultFunctionArrayConversion(RHS); 3457 return RHS->getType(); 3458} 3459 3460/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 3461/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 3462QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 3463 bool isInc) { 3464 if (Op->isTypeDependent()) 3465 return Context.DependentTy; 3466 3467 QualType ResType = Op->getType(); 3468 assert(!ResType.isNull() && "no type for increment/decrement expression"); 3469 3470 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 3471 // Decrement of bool is not allowed. 3472 if (!isInc) { 3473 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 3474 return QualType(); 3475 } 3476 // Increment of bool sets it to true, but is deprecated. 3477 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 3478 } else if (ResType->isRealType()) { 3479 // OK! 3480 } else if (const PointerType *PT = ResType->getAsPointerType()) { 3481 // C99 6.5.2.4p2, 6.5.6p2 3482 if (PT->getPointeeType()->isObjectType()) { 3483 // Pointer to object is ok! 3484 } else if (PT->getPointeeType()->isVoidType()) { 3485 if (getLangOptions().CPlusPlus) { 3486 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 3487 << Op->getSourceRange(); 3488 return QualType(); 3489 } 3490 3491 // Pointer to void is a GNU extension in C. 3492 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 3493 } else if (PT->getPointeeType()->isFunctionType()) { 3494 if (getLangOptions().CPlusPlus) { 3495 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 3496 << Op->getType() << Op->getSourceRange(); 3497 return QualType(); 3498 } 3499 3500 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 3501 << ResType << Op->getSourceRange(); 3502 return QualType(); 3503 } else { 3504 DiagnoseIncompleteType(OpLoc, PT->getPointeeType(), 3505 diag::err_typecheck_arithmetic_incomplete_type, 3506 Op->getSourceRange(), SourceRange(), 3507 ResType); 3508 return QualType(); 3509 } 3510 } else if (ResType->isComplexType()) { 3511 // C99 does not support ++/-- on complex types, we allow as an extension. 3512 Diag(OpLoc, diag::ext_integer_increment_complex) 3513 << ResType << Op->getSourceRange(); 3514 } else { 3515 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 3516 << ResType << Op->getSourceRange(); 3517 return QualType(); 3518 } 3519 // At this point, we know we have a real, complex or pointer type. 3520 // Now make sure the operand is a modifiable lvalue. 3521 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 3522 return QualType(); 3523 return ResType; 3524} 3525 3526/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 3527/// This routine allows us to typecheck complex/recursive expressions 3528/// where the declaration is needed for type checking. We only need to 3529/// handle cases when the expression references a function designator 3530/// or is an lvalue. Here are some examples: 3531/// - &(x) => x 3532/// - &*****f => f for f a function designator. 3533/// - &s.xx => s 3534/// - &s.zz[1].yy -> s, if zz is an array 3535/// - *(x + 1) -> x, if x is an array 3536/// - &"123"[2] -> 0 3537/// - & __real__ x -> x 3538static NamedDecl *getPrimaryDecl(Expr *E) { 3539 switch (E->getStmtClass()) { 3540 case Stmt::DeclRefExprClass: 3541 case Stmt::QualifiedDeclRefExprClass: 3542 return cast<DeclRefExpr>(E)->getDecl(); 3543 case Stmt::MemberExprClass: 3544 // Fields cannot be declared with a 'register' storage class. 3545 // &X->f is always ok, even if X is declared register. 3546 if (cast<MemberExpr>(E)->isArrow()) 3547 return 0; 3548 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 3549 case Stmt::ArraySubscriptExprClass: { 3550 // &X[4] and &4[X] refers to X if X is not a pointer. 3551 3552 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 3553 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 3554 if (!VD || VD->getType()->isPointerType()) 3555 return 0; 3556 else 3557 return VD; 3558 } 3559 case Stmt::UnaryOperatorClass: { 3560 UnaryOperator *UO = cast<UnaryOperator>(E); 3561 3562 switch(UO->getOpcode()) { 3563 case UnaryOperator::Deref: { 3564 // *(X + 1) refers to X if X is not a pointer. 3565 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 3566 ValueDecl *VD = dyn_cast<ValueDecl>(D); 3567 if (!VD || VD->getType()->isPointerType()) 3568 return 0; 3569 return VD; 3570 } 3571 return 0; 3572 } 3573 case UnaryOperator::Real: 3574 case UnaryOperator::Imag: 3575 case UnaryOperator::Extension: 3576 return getPrimaryDecl(UO->getSubExpr()); 3577 default: 3578 return 0; 3579 } 3580 } 3581 case Stmt::BinaryOperatorClass: { 3582 BinaryOperator *BO = cast<BinaryOperator>(E); 3583 3584 // Handle cases involving pointer arithmetic. The result of an 3585 // Assign or AddAssign is not an lvalue so they can be ignored. 3586 3587 // (x + n) or (n + x) => x 3588 if (BO->getOpcode() == BinaryOperator::Add) { 3589 if (BO->getLHS()->getType()->isPointerType()) { 3590 return getPrimaryDecl(BO->getLHS()); 3591 } else if (BO->getRHS()->getType()->isPointerType()) { 3592 return getPrimaryDecl(BO->getRHS()); 3593 } 3594 } 3595 3596 return 0; 3597 } 3598 case Stmt::ParenExprClass: 3599 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 3600 case Stmt::ImplicitCastExprClass: 3601 // &X[4] when X is an array, has an implicit cast from array to pointer. 3602 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 3603 default: 3604 return 0; 3605 } 3606} 3607 3608/// CheckAddressOfOperand - The operand of & must be either a function 3609/// designator or an lvalue designating an object. If it is an lvalue, the 3610/// object cannot be declared with storage class register or be a bit field. 3611/// Note: The usual conversions are *not* applied to the operand of the & 3612/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 3613/// In C++, the operand might be an overloaded function name, in which case 3614/// we allow the '&' but retain the overloaded-function type. 3615QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 3616 if (op->isTypeDependent()) 3617 return Context.DependentTy; 3618 3619 if (getLangOptions().C99) { 3620 // Implement C99-only parts of addressof rules. 3621 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 3622 if (uOp->getOpcode() == UnaryOperator::Deref) 3623 // Per C99 6.5.3.2, the address of a deref always returns a valid result 3624 // (assuming the deref expression is valid). 3625 return uOp->getSubExpr()->getType(); 3626 } 3627 // Technically, there should be a check for array subscript 3628 // expressions here, but the result of one is always an lvalue anyway. 3629 } 3630 NamedDecl *dcl = getPrimaryDecl(op); 3631 Expr::isLvalueResult lval = op->isLvalue(Context); 3632 3633 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 3634 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 3635 // FIXME: emit more specific diag... 3636 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 3637 << op->getSourceRange(); 3638 return QualType(); 3639 } 3640 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 3641 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemExpr->getMemberDecl())) { 3642 if (Field->isBitField()) { 3643 Diag(OpLoc, diag::err_typecheck_address_of) 3644 << "bit-field" << op->getSourceRange(); 3645 return QualType(); 3646 } 3647 } 3648 // Check for Apple extension for accessing vector components. 3649 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 3650 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 3651 Diag(OpLoc, diag::err_typecheck_address_of) 3652 << "vector element" << op->getSourceRange(); 3653 return QualType(); 3654 } else if (dcl) { // C99 6.5.3.2p1 3655 // We have an lvalue with a decl. Make sure the decl is not declared 3656 // with the register storage-class specifier. 3657 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 3658 if (vd->getStorageClass() == VarDecl::Register) { 3659 Diag(OpLoc, diag::err_typecheck_address_of) 3660 << "register variable" << op->getSourceRange(); 3661 return QualType(); 3662 } 3663 } else if (isa<OverloadedFunctionDecl>(dcl)) { 3664 return Context.OverloadTy; 3665 } else if (isa<FieldDecl>(dcl)) { 3666 // Okay: we can take the address of a field. 3667 // Could be a pointer to member, though, if there is an explicit 3668 // scope qualifier for the class. 3669 if (isa<QualifiedDeclRefExpr>(op)) { 3670 DeclContext *Ctx = dcl->getDeclContext(); 3671 if (Ctx && Ctx->isRecord()) 3672 return Context.getMemberPointerType(op->getType(), 3673 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3674 } 3675 } else if (isa<FunctionDecl>(dcl)) { 3676 // Okay: we can take the address of a function. 3677 // As above. 3678 if (isa<QualifiedDeclRefExpr>(op)) { 3679 DeclContext *Ctx = dcl->getDeclContext(); 3680 if (Ctx && Ctx->isRecord()) 3681 return Context.getMemberPointerType(op->getType(), 3682 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3683 } 3684 } 3685 else 3686 assert(0 && "Unknown/unexpected decl type"); 3687 } 3688 3689 // If the operand has type "type", the result has type "pointer to type". 3690 return Context.getPointerType(op->getType()); 3691} 3692 3693QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 3694 if (Op->isTypeDependent()) 3695 return Context.DependentTy; 3696 3697 UsualUnaryConversions(Op); 3698 QualType Ty = Op->getType(); 3699 3700 // Note that per both C89 and C99, this is always legal, even if ptype is an 3701 // incomplete type or void. It would be possible to warn about dereferencing 3702 // a void pointer, but it's completely well-defined, and such a warning is 3703 // unlikely to catch any mistakes. 3704 if (const PointerType *PT = Ty->getAsPointerType()) 3705 return PT->getPointeeType(); 3706 3707 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 3708 << Ty << Op->getSourceRange(); 3709 return QualType(); 3710} 3711 3712static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 3713 tok::TokenKind Kind) { 3714 BinaryOperator::Opcode Opc; 3715 switch (Kind) { 3716 default: assert(0 && "Unknown binop!"); 3717 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 3718 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 3719 case tok::star: Opc = BinaryOperator::Mul; break; 3720 case tok::slash: Opc = BinaryOperator::Div; break; 3721 case tok::percent: Opc = BinaryOperator::Rem; break; 3722 case tok::plus: Opc = BinaryOperator::Add; break; 3723 case tok::minus: Opc = BinaryOperator::Sub; break; 3724 case tok::lessless: Opc = BinaryOperator::Shl; break; 3725 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 3726 case tok::lessequal: Opc = BinaryOperator::LE; break; 3727 case tok::less: Opc = BinaryOperator::LT; break; 3728 case tok::greaterequal: Opc = BinaryOperator::GE; break; 3729 case tok::greater: Opc = BinaryOperator::GT; break; 3730 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 3731 case tok::equalequal: Opc = BinaryOperator::EQ; break; 3732 case tok::amp: Opc = BinaryOperator::And; break; 3733 case tok::caret: Opc = BinaryOperator::Xor; break; 3734 case tok::pipe: Opc = BinaryOperator::Or; break; 3735 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 3736 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 3737 case tok::equal: Opc = BinaryOperator::Assign; break; 3738 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 3739 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 3740 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 3741 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 3742 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 3743 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 3744 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 3745 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 3746 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 3747 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 3748 case tok::comma: Opc = BinaryOperator::Comma; break; 3749 } 3750 return Opc; 3751} 3752 3753static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 3754 tok::TokenKind Kind) { 3755 UnaryOperator::Opcode Opc; 3756 switch (Kind) { 3757 default: assert(0 && "Unknown unary op!"); 3758 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 3759 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 3760 case tok::amp: Opc = UnaryOperator::AddrOf; break; 3761 case tok::star: Opc = UnaryOperator::Deref; break; 3762 case tok::plus: Opc = UnaryOperator::Plus; break; 3763 case tok::minus: Opc = UnaryOperator::Minus; break; 3764 case tok::tilde: Opc = UnaryOperator::Not; break; 3765 case tok::exclaim: Opc = UnaryOperator::LNot; break; 3766 case tok::kw___real: Opc = UnaryOperator::Real; break; 3767 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 3768 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 3769 } 3770 return Opc; 3771} 3772 3773/// CreateBuiltinBinOp - Creates a new built-in binary operation with 3774/// operator @p Opc at location @c TokLoc. This routine only supports 3775/// built-in operations; ActOnBinOp handles overloaded operators. 3776Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 3777 unsigned Op, 3778 Expr *lhs, Expr *rhs) { 3779 QualType ResultTy; // Result type of the binary operator. 3780 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 3781 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 3782 3783 switch (Opc) { 3784 default: 3785 assert(0 && "Unknown binary expr!"); 3786 case BinaryOperator::Assign: 3787 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 3788 break; 3789 case BinaryOperator::PtrMemD: 3790 case BinaryOperator::PtrMemI: 3791 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 3792 Opc == BinaryOperator::PtrMemI); 3793 break; 3794 case BinaryOperator::Mul: 3795 case BinaryOperator::Div: 3796 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 3797 break; 3798 case BinaryOperator::Rem: 3799 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 3800 break; 3801 case BinaryOperator::Add: 3802 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 3803 break; 3804 case BinaryOperator::Sub: 3805 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 3806 break; 3807 case BinaryOperator::Shl: 3808 case BinaryOperator::Shr: 3809 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 3810 break; 3811 case BinaryOperator::LE: 3812 case BinaryOperator::LT: 3813 case BinaryOperator::GE: 3814 case BinaryOperator::GT: 3815 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 3816 break; 3817 case BinaryOperator::EQ: 3818 case BinaryOperator::NE: 3819 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 3820 break; 3821 case BinaryOperator::And: 3822 case BinaryOperator::Xor: 3823 case BinaryOperator::Or: 3824 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 3825 break; 3826 case BinaryOperator::LAnd: 3827 case BinaryOperator::LOr: 3828 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 3829 break; 3830 case BinaryOperator::MulAssign: 3831 case BinaryOperator::DivAssign: 3832 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 3833 if (!CompTy.isNull()) 3834 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3835 break; 3836 case BinaryOperator::RemAssign: 3837 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 3838 if (!CompTy.isNull()) 3839 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3840 break; 3841 case BinaryOperator::AddAssign: 3842 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 3843 if (!CompTy.isNull()) 3844 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3845 break; 3846 case BinaryOperator::SubAssign: 3847 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 3848 if (!CompTy.isNull()) 3849 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3850 break; 3851 case BinaryOperator::ShlAssign: 3852 case BinaryOperator::ShrAssign: 3853 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 3854 if (!CompTy.isNull()) 3855 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3856 break; 3857 case BinaryOperator::AndAssign: 3858 case BinaryOperator::XorAssign: 3859 case BinaryOperator::OrAssign: 3860 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 3861 if (!CompTy.isNull()) 3862 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3863 break; 3864 case BinaryOperator::Comma: 3865 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 3866 break; 3867 } 3868 if (ResultTy.isNull()) 3869 return ExprError(); 3870 if (CompTy.isNull()) 3871 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 3872 else 3873 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 3874 CompTy, OpLoc)); 3875} 3876 3877// Binary Operators. 'Tok' is the token for the operator. 3878Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 3879 tok::TokenKind Kind, 3880 ExprArg LHS, ExprArg RHS) { 3881 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 3882 Expr *lhs = (Expr *)LHS.release(), *rhs = (Expr*)RHS.release(); 3883 3884 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 3885 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 3886 3887 // If either expression is type-dependent, just build the AST. 3888 // FIXME: We'll need to perform some caching of the result of name 3889 // lookup for operator+. 3890 if (lhs->isTypeDependent() || rhs->isTypeDependent()) { 3891 if (Opc > BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) 3892 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, 3893 Context.DependentTy, 3894 Context.DependentTy, TokLoc)); 3895 else 3896 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, 3897 Context.DependentTy, TokLoc)); 3898 } 3899 3900 if (getLangOptions().CPlusPlus && Opc != BinaryOperator::PtrMemD && 3901 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 3902 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 3903 // If this is one of the assignment operators, we only perform 3904 // overload resolution if the left-hand side is a class or 3905 // enumeration type (C++ [expr.ass]p3). 3906 if (Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign && 3907 !(lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType())) { 3908 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3909 } 3910 3911 // Determine which overloaded operator we're dealing with. 3912 static const OverloadedOperatorKind OverOps[] = { 3913 // Overloading .* is not possible. 3914 static_cast<OverloadedOperatorKind>(0), OO_ArrowStar, 3915 OO_Star, OO_Slash, OO_Percent, 3916 OO_Plus, OO_Minus, 3917 OO_LessLess, OO_GreaterGreater, 3918 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 3919 OO_EqualEqual, OO_ExclaimEqual, 3920 OO_Amp, 3921 OO_Caret, 3922 OO_Pipe, 3923 OO_AmpAmp, 3924 OO_PipePipe, 3925 OO_Equal, OO_StarEqual, 3926 OO_SlashEqual, OO_PercentEqual, 3927 OO_PlusEqual, OO_MinusEqual, 3928 OO_LessLessEqual, OO_GreaterGreaterEqual, 3929 OO_AmpEqual, OO_CaretEqual, 3930 OO_PipeEqual, 3931 OO_Comma 3932 }; 3933 OverloadedOperatorKind OverOp = OverOps[Opc]; 3934 3935 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3936 // to the candidate set. 3937 OverloadCandidateSet CandidateSet; 3938 Expr *Args[2] = { lhs, rhs }; 3939 if (AddOperatorCandidates(OverOp, S, TokLoc, Args, 2, CandidateSet)) 3940 return ExprError(); 3941 3942 // Perform overload resolution. 3943 OverloadCandidateSet::iterator Best; 3944 switch (BestViableFunction(CandidateSet, Best)) { 3945 case OR_Success: { 3946 // We found a built-in operator or an overloaded operator. 3947 FunctionDecl *FnDecl = Best->Function; 3948 3949 if (FnDecl) { 3950 // We matched an overloaded operator. Build a call to that 3951 // operator. 3952 3953 // Convert the arguments. 3954 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3955 if (PerformObjectArgumentInitialization(lhs, Method) || 3956 PerformCopyInitialization(rhs, FnDecl->getParamDecl(0)->getType(), 3957 "passing")) 3958 return ExprError(); 3959 } else { 3960 // Convert the arguments. 3961 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 3962 "passing") || 3963 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 3964 "passing")) 3965 return ExprError(); 3966 } 3967 3968 // Determine the result type 3969 QualType ResultTy 3970 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3971 ResultTy = ResultTy.getNonReferenceType(); 3972 3973 // Build the actual expression node. 3974 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 3975 SourceLocation()); 3976 UsualUnaryConversions(FnExpr); 3977 3978 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 3979 ResultTy, TokLoc)); 3980 } else { 3981 // We matched a built-in operator. Convert the arguments, then 3982 // break out so that we will build the appropriate built-in 3983 // operator node. 3984 if (PerformImplicitConversion(lhs, Best->BuiltinTypes.ParamTypes[0], 3985 Best->Conversions[0], "passing") || 3986 PerformImplicitConversion(rhs, Best->BuiltinTypes.ParamTypes[1], 3987 Best->Conversions[1], "passing")) 3988 return ExprError(); 3989 3990 break; 3991 } 3992 } 3993 3994 case OR_No_Viable_Function: 3995 // No viable function; fall through to handling this as a 3996 // built-in operator, which will produce an error message for us. 3997 break; 3998 3999 case OR_Ambiguous: 4000 Diag(TokLoc, diag::err_ovl_ambiguous_oper) 4001 << BinaryOperator::getOpcodeStr(Opc) 4002 << lhs->getSourceRange() << rhs->getSourceRange(); 4003 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4004 return ExprError(); 4005 4006 case OR_Deleted: 4007 Diag(TokLoc, diag::err_ovl_deleted_oper) 4008 << Best->Function->isDeleted() 4009 << BinaryOperator::getOpcodeStr(Opc) 4010 << lhs->getSourceRange() << rhs->getSourceRange(); 4011 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4012 return ExprError(); 4013 } 4014 4015 // Either we found no viable overloaded operator or we matched a 4016 // built-in operator. In either case, fall through to trying to 4017 // build a built-in operation. 4018 } 4019 4020 // Build a built-in binary operation. 4021 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4022} 4023 4024// Unary Operators. 'Tok' is the token for the operator. 4025Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4026 tok::TokenKind Op, ExprArg input) { 4027 // FIXME: Input is modified later, but smart pointer not reassigned. 4028 Expr *Input = (Expr*)input.get(); 4029 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4030 4031 if (getLangOptions().CPlusPlus && 4032 (Input->getType()->isRecordType() 4033 || Input->getType()->isEnumeralType())) { 4034 // Determine which overloaded operator we're dealing with. 4035 static const OverloadedOperatorKind OverOps[] = { 4036 OO_None, OO_None, 4037 OO_PlusPlus, OO_MinusMinus, 4038 OO_Amp, OO_Star, 4039 OO_Plus, OO_Minus, 4040 OO_Tilde, OO_Exclaim, 4041 OO_None, OO_None, 4042 OO_None, 4043 OO_None 4044 }; 4045 OverloadedOperatorKind OverOp = OverOps[Opc]; 4046 4047 // Add the appropriate overloaded operators (C++ [over.match.oper]) 4048 // to the candidate set. 4049 OverloadCandidateSet CandidateSet; 4050 if (OverOp != OO_None && 4051 AddOperatorCandidates(OverOp, S, OpLoc, &Input, 1, CandidateSet)) 4052 return ExprError(); 4053 4054 // Perform overload resolution. 4055 OverloadCandidateSet::iterator Best; 4056 switch (BestViableFunction(CandidateSet, Best)) { 4057 case OR_Success: { 4058 // We found a built-in operator or an overloaded operator. 4059 FunctionDecl *FnDecl = Best->Function; 4060 4061 if (FnDecl) { 4062 // We matched an overloaded operator. Build a call to that 4063 // operator. 4064 4065 // Convert the arguments. 4066 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 4067 if (PerformObjectArgumentInitialization(Input, Method)) 4068 return ExprError(); 4069 } else { 4070 // Convert the arguments. 4071 if (PerformCopyInitialization(Input, 4072 FnDecl->getParamDecl(0)->getType(), 4073 "passing")) 4074 return ExprError(); 4075 } 4076 4077 // Determine the result type 4078 QualType ResultTy 4079 = FnDecl->getType()->getAsFunctionType()->getResultType(); 4080 ResultTy = ResultTy.getNonReferenceType(); 4081 4082 // Build the actual expression node. 4083 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 4084 SourceLocation()); 4085 UsualUnaryConversions(FnExpr); 4086 4087 input.release(); 4088 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, &Input, 4089 1, ResultTy, OpLoc)); 4090 } else { 4091 // We matched a built-in operator. Convert the arguments, then 4092 // break out so that we will build the appropriate built-in 4093 // operator node. 4094 if (PerformImplicitConversion(Input, Best->BuiltinTypes.ParamTypes[0], 4095 Best->Conversions[0], "passing")) 4096 return ExprError(); 4097 4098 break; 4099 } 4100 } 4101 4102 case OR_No_Viable_Function: 4103 // No viable function; fall through to handling this as a 4104 // built-in operator, which will produce an error message for us. 4105 break; 4106 4107 case OR_Ambiguous: 4108 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 4109 << UnaryOperator::getOpcodeStr(Opc) 4110 << Input->getSourceRange(); 4111 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4112 return ExprError(); 4113 4114 case OR_Deleted: 4115 Diag(OpLoc, diag::err_ovl_deleted_oper) 4116 << Best->Function->isDeleted() 4117 << UnaryOperator::getOpcodeStr(Opc) 4118 << Input->getSourceRange(); 4119 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4120 return ExprError(); 4121 } 4122 4123 // Either we found no viable overloaded operator or we matched a 4124 // built-in operator. In either case, fall through to trying to 4125 // build a built-in operation. 4126 } 4127 4128 QualType resultType; 4129 switch (Opc) { 4130 default: 4131 assert(0 && "Unimplemented unary expr!"); 4132 case UnaryOperator::PreInc: 4133 case UnaryOperator::PreDec: 4134 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4135 Opc == UnaryOperator::PreInc); 4136 break; 4137 case UnaryOperator::AddrOf: 4138 resultType = CheckAddressOfOperand(Input, OpLoc); 4139 break; 4140 case UnaryOperator::Deref: 4141 DefaultFunctionArrayConversion(Input); 4142 resultType = CheckIndirectionOperand(Input, OpLoc); 4143 break; 4144 case UnaryOperator::Plus: 4145 case UnaryOperator::Minus: 4146 UsualUnaryConversions(Input); 4147 resultType = Input->getType(); 4148 if (resultType->isDependentType()) 4149 break; 4150 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4151 break; 4152 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4153 resultType->isEnumeralType()) 4154 break; 4155 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4156 Opc == UnaryOperator::Plus && 4157 resultType->isPointerType()) 4158 break; 4159 4160 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4161 << resultType << Input->getSourceRange()); 4162 case UnaryOperator::Not: // bitwise complement 4163 UsualUnaryConversions(Input); 4164 resultType = Input->getType(); 4165 if (resultType->isDependentType()) 4166 break; 4167 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4168 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4169 // C99 does not support '~' for complex conjugation. 4170 Diag(OpLoc, diag::ext_integer_complement_complex) 4171 << resultType << Input->getSourceRange(); 4172 else if (!resultType->isIntegerType()) 4173 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4174 << resultType << Input->getSourceRange()); 4175 break; 4176 case UnaryOperator::LNot: // logical negation 4177 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4178 DefaultFunctionArrayConversion(Input); 4179 resultType = Input->getType(); 4180 if (resultType->isDependentType()) 4181 break; 4182 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4183 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4184 << resultType << Input->getSourceRange()); 4185 // LNot always has type int. C99 6.5.3.3p5. 4186 // In C++, it's bool. C++ 5.3.1p8 4187 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4188 break; 4189 case UnaryOperator::Real: 4190 case UnaryOperator::Imag: 4191 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4192 break; 4193 case UnaryOperator::Extension: 4194 resultType = Input->getType(); 4195 break; 4196 } 4197 if (resultType.isNull()) 4198 return ExprError(); 4199 input.release(); 4200 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4201} 4202 4203/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4204Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4205 SourceLocation LabLoc, 4206 IdentifierInfo *LabelII) { 4207 // Look up the record for this label identifier. 4208 LabelStmt *&LabelDecl = LabelMap[LabelII]; 4209 4210 // If we haven't seen this label yet, create a forward reference. It 4211 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4212 if (LabelDecl == 0) 4213 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4214 4215 // Create the AST node. The address of a label always has type 'void*'. 4216 return new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4217 Context.getPointerType(Context.VoidTy)); 4218} 4219 4220Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 4221 SourceLocation RPLoc) { // "({..})" 4222 Stmt *SubStmt = static_cast<Stmt*>(substmt); 4223 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4224 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4225 4226 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4227 if (isFileScope) { 4228 return Diag(LPLoc, diag::err_stmtexpr_file_scope); 4229 } 4230 4231 // FIXME: there are a variety of strange constraints to enforce here, for 4232 // example, it is not possible to goto into a stmt expression apparently. 4233 // More semantic analysis is needed. 4234 4235 // FIXME: the last statement in the compount stmt has its value used. We 4236 // should not warn about it being unused. 4237 4238 // If there are sub stmts in the compound stmt, take the type of the last one 4239 // as the type of the stmtexpr. 4240 QualType Ty = Context.VoidTy; 4241 4242 if (!Compound->body_empty()) { 4243 Stmt *LastStmt = Compound->body_back(); 4244 // If LastStmt is a label, skip down through into the body. 4245 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4246 LastStmt = Label->getSubStmt(); 4247 4248 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4249 Ty = LastExpr->getType(); 4250 } 4251 4252 return new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc); 4253} 4254 4255Sema::ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4256 SourceLocation BuiltinLoc, 4257 SourceLocation TypeLoc, 4258 TypeTy *argty, 4259 OffsetOfComponent *CompPtr, 4260 unsigned NumComponents, 4261 SourceLocation RPLoc) { 4262 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4263 assert(!ArgTy.isNull() && "Missing type argument!"); 4264 4265 bool Dependent = ArgTy->isDependentType(); 4266 4267 // We must have at least one component that refers to the type, and the first 4268 // one is known to be a field designator. Verify that the ArgTy represents 4269 // a struct/union/class. 4270 if (!Dependent && !ArgTy->isRecordType()) 4271 return Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy; 4272 4273 // Otherwise, create a null pointer as the base, and iteratively process 4274 // the offsetof designators. 4275 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4276 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4277 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4278 ArgTy, SourceLocation()); 4279 4280 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4281 // GCC extension, diagnose them. 4282 // FIXME: This diagnostic isn't actually visible because the location is in 4283 // a system header! 4284 if (NumComponents != 1) 4285 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4286 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4287 4288 if (!Dependent) { 4289 // FIXME: Dependent case loses a lot of information here. And probably 4290 // leaks like a sieve. 4291 for (unsigned i = 0; i != NumComponents; ++i) { 4292 const OffsetOfComponent &OC = CompPtr[i]; 4293 if (OC.isBrackets) { 4294 // Offset of an array sub-field. TODO: Should we allow vector elements? 4295 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4296 if (!AT) { 4297 Res->Destroy(Context); 4298 return Diag(OC.LocEnd, diag::err_offsetof_array_type) 4299 << Res->getType(); 4300 } 4301 4302 // FIXME: C++: Verify that operator[] isn't overloaded. 4303 4304 // Promote the array so it looks more like a normal array subscript 4305 // expression. 4306 DefaultFunctionArrayConversion(Res); 4307 4308 // C99 6.5.2.1p1 4309 Expr *Idx = static_cast<Expr*>(OC.U.E); 4310 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4311 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript) 4312 << Idx->getSourceRange(); 4313 4314 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4315 OC.LocEnd); 4316 continue; 4317 } 4318 4319 const RecordType *RC = Res->getType()->getAsRecordType(); 4320 if (!RC) { 4321 Res->Destroy(Context); 4322 return Diag(OC.LocEnd, diag::err_offsetof_record_type) 4323 << Res->getType(); 4324 } 4325 4326 // Get the decl corresponding to this. 4327 RecordDecl *RD = RC->getDecl(); 4328 FieldDecl *MemberDecl 4329 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4330 LookupMemberName) 4331 .getAsDecl()); 4332 if (!MemberDecl) 4333 return Diag(BuiltinLoc, diag::err_typecheck_no_member) 4334 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd); 4335 4336 // FIXME: C++: Verify that MemberDecl isn't a static field. 4337 // FIXME: Verify that MemberDecl isn't a bitfield. 4338 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 4339 // matter here. 4340 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4341 MemberDecl->getType().getNonReferenceType()); 4342 } 4343 } 4344 4345 return new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4346 Context.getSizeType(), BuiltinLoc); 4347} 4348 4349 4350Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4351 TypeTy *arg1, TypeTy *arg2, 4352 SourceLocation RPLoc) { 4353 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4354 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4355 4356 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4357 4358 return new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, 4359 argT2, RPLoc); 4360} 4361 4362Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 4363 ExprTy *expr1, ExprTy *expr2, 4364 SourceLocation RPLoc) { 4365 Expr *CondExpr = static_cast<Expr*>(cond); 4366 Expr *LHSExpr = static_cast<Expr*>(expr1); 4367 Expr *RHSExpr = static_cast<Expr*>(expr2); 4368 4369 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4370 4371 QualType resType; 4372 if (CondExpr->isValueDependent()) { 4373 resType = Context.DependentTy; 4374 } else { 4375 // The conditional expression is required to be a constant expression. 4376 llvm::APSInt condEval(32); 4377 SourceLocation ExpLoc; 4378 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4379 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant) 4380 << CondExpr->getSourceRange(); 4381 4382 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4383 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 4384 } 4385 4386 return new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4387 resType, RPLoc); 4388} 4389 4390//===----------------------------------------------------------------------===// 4391// Clang Extensions. 4392//===----------------------------------------------------------------------===// 4393 4394/// ActOnBlockStart - This callback is invoked when a block literal is started. 4395void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4396 // Analyze block parameters. 4397 BlockSemaInfo *BSI = new BlockSemaInfo(); 4398 4399 // Add BSI to CurBlock. 4400 BSI->PrevBlockInfo = CurBlock; 4401 CurBlock = BSI; 4402 4403 BSI->ReturnType = 0; 4404 BSI->TheScope = BlockScope; 4405 BSI->hasBlockDeclRefExprs = false; 4406 4407 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4408 PushDeclContext(BlockScope, BSI->TheDecl); 4409} 4410 4411void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4412 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4413 4414 if (ParamInfo.getNumTypeObjects() == 0 4415 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4416 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4417 4418 // The type is entirely optional as well, if none, use DependentTy. 4419 if (T.isNull()) 4420 T = Context.DependentTy; 4421 4422 // The parameter list is optional, if there was none, assume (). 4423 if (!T->isFunctionType()) 4424 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4425 4426 CurBlock->hasPrototype = true; 4427 CurBlock->isVariadic = false; 4428 Type *RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4429 .getTypePtr(); 4430 4431 if (!RetTy->isDependentType()) 4432 CurBlock->ReturnType = RetTy; 4433 return; 4434 } 4435 4436 // Analyze arguments to block. 4437 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4438 "Not a function declarator!"); 4439 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4440 4441 CurBlock->hasPrototype = FTI.hasPrototype; 4442 CurBlock->isVariadic = true; 4443 4444 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4445 // no arguments, not a function that takes a single void argument. 4446 if (FTI.hasPrototype && 4447 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4448 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 4449 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 4450 // empty arg list, don't push any params. 4451 CurBlock->isVariadic = false; 4452 } else if (FTI.hasPrototype) { 4453 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4454 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 4455 CurBlock->isVariadic = FTI.isVariadic; 4456 QualType T = GetTypeForDeclarator (ParamInfo, CurScope); 4457 4458 Type* RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4459 .getTypePtr(); 4460 4461 if (!RetTy->isDependentType()) 4462 CurBlock->ReturnType = RetTy; 4463 } 4464 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 4465 4466 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4467 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4468 // If this has an identifier, add it to the scope stack. 4469 if ((*AI)->getIdentifier()) 4470 PushOnScopeChains(*AI, CurBlock->TheScope); 4471} 4472 4473/// ActOnBlockError - If there is an error parsing a block, this callback 4474/// is invoked to pop the information about the block from the action impl. 4475void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4476 // Ensure that CurBlock is deleted. 4477 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4478 4479 // Pop off CurBlock, handle nested blocks. 4480 CurBlock = CurBlock->PrevBlockInfo; 4481 4482 // FIXME: Delete the ParmVarDecl objects as well??? 4483 4484} 4485 4486/// ActOnBlockStmtExpr - This is called when the body of a block statement 4487/// literal was successfully completed. ^(int x){...} 4488Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 4489 Scope *CurScope) { 4490 // Ensure that CurBlock is deleted. 4491 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4492 ExprOwningPtr<CompoundStmt> Body(this, static_cast<CompoundStmt*>(body)); 4493 4494 PopDeclContext(); 4495 4496 // Pop off CurBlock, handle nested blocks. 4497 CurBlock = CurBlock->PrevBlockInfo; 4498 4499 QualType RetTy = Context.VoidTy; 4500 if (BSI->ReturnType) 4501 RetTy = QualType(BSI->ReturnType, 0); 4502 4503 llvm::SmallVector<QualType, 8> ArgTypes; 4504 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4505 ArgTypes.push_back(BSI->Params[i]->getType()); 4506 4507 QualType BlockTy; 4508 if (!BSI->hasPrototype) 4509 BlockTy = Context.getFunctionNoProtoType(RetTy); 4510 else 4511 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 4512 BSI->isVariadic, 0); 4513 4514 BlockTy = Context.getBlockPointerType(BlockTy); 4515 4516 BSI->TheDecl->setBody(Body.take()); 4517 return new (Context) BlockExpr(BSI->TheDecl, BlockTy, BSI->hasBlockDeclRefExprs); 4518} 4519 4520Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 4521 ExprTy *expr, TypeTy *type, 4522 SourceLocation RPLoc) { 4523 Expr *E = static_cast<Expr*>(expr); 4524 QualType T = QualType::getFromOpaquePtr(type); 4525 4526 InitBuiltinVaListType(); 4527 4528 // Get the va_list type 4529 QualType VaListType = Context.getBuiltinVaListType(); 4530 // Deal with implicit array decay; for example, on x86-64, 4531 // va_list is an array, but it's supposed to decay to 4532 // a pointer for va_arg. 4533 if (VaListType->isArrayType()) 4534 VaListType = Context.getArrayDecayedType(VaListType); 4535 // Make sure the input expression also decays appropriately. 4536 UsualUnaryConversions(E); 4537 4538 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 4539 return Diag(E->getLocStart(), 4540 diag::err_first_argument_to_va_arg_not_of_type_va_list) 4541 << E->getType() << E->getSourceRange(); 4542 4543 // FIXME: Warn if a non-POD type is passed in. 4544 4545 return new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 4546} 4547 4548Sema::ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 4549 // The type of __null will be int or long, depending on the size of 4550 // pointers on the target. 4551 QualType Ty; 4552 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 4553 Ty = Context.IntTy; 4554 else 4555 Ty = Context.LongTy; 4556 4557 return new (Context) GNUNullExpr(Ty, TokenLoc); 4558} 4559 4560bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 4561 SourceLocation Loc, 4562 QualType DstType, QualType SrcType, 4563 Expr *SrcExpr, const char *Flavor) { 4564 // Decode the result (notice that AST's are still created for extensions). 4565 bool isInvalid = false; 4566 unsigned DiagKind; 4567 switch (ConvTy) { 4568 default: assert(0 && "Unknown conversion type"); 4569 case Compatible: return false; 4570 case PointerToInt: 4571 DiagKind = diag::ext_typecheck_convert_pointer_int; 4572 break; 4573 case IntToPointer: 4574 DiagKind = diag::ext_typecheck_convert_int_pointer; 4575 break; 4576 case IncompatiblePointer: 4577 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 4578 break; 4579 case FunctionVoidPointer: 4580 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 4581 break; 4582 case CompatiblePointerDiscardsQualifiers: 4583 // If the qualifiers lost were because we were applying the 4584 // (deprecated) C++ conversion from a string literal to a char* 4585 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 4586 // Ideally, this check would be performed in 4587 // CheckPointerTypesForAssignment. However, that would require a 4588 // bit of refactoring (so that the second argument is an 4589 // expression, rather than a type), which should be done as part 4590 // of a larger effort to fix CheckPointerTypesForAssignment for 4591 // C++ semantics. 4592 if (getLangOptions().CPlusPlus && 4593 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 4594 return false; 4595 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 4596 break; 4597 case IntToBlockPointer: 4598 DiagKind = diag::err_int_to_block_pointer; 4599 break; 4600 case IncompatibleBlockPointer: 4601 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 4602 break; 4603 case IncompatibleObjCQualifiedId: 4604 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 4605 // it can give a more specific diagnostic. 4606 DiagKind = diag::warn_incompatible_qualified_id; 4607 break; 4608 case IncompatibleVectors: 4609 DiagKind = diag::warn_incompatible_vectors; 4610 break; 4611 case Incompatible: 4612 DiagKind = diag::err_typecheck_convert_incompatible; 4613 isInvalid = true; 4614 break; 4615 } 4616 4617 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 4618 << SrcExpr->getSourceRange(); 4619 return isInvalid; 4620} 4621 4622bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 4623{ 4624 Expr::EvalResult EvalResult; 4625 4626 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 4627 EvalResult.HasSideEffects) { 4628 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 4629 4630 if (EvalResult.Diag) { 4631 // We only show the note if it's not the usual "invalid subexpression" 4632 // or if it's actually in a subexpression. 4633 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 4634 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 4635 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4636 } 4637 4638 return true; 4639 } 4640 4641 if (EvalResult.Diag) { 4642 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 4643 E->getSourceRange(); 4644 4645 // Print the reason it's not a constant. 4646 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4647 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4648 } 4649 4650 if (Result) 4651 *Result = EvalResult.Val.getInt(); 4652 return false; 4653} 4654