SemaExpr.cpp revision bf2b09573dae03f9b03f389a030d7ce2aa7e7d18
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/LiteralSupport.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29/// \brief Determine whether the use of this declaration is valid, and 30/// emit any corresponding diagnostics. 31/// 32/// This routine diagnoses various problems with referencing 33/// declarations that can occur when using a declaration. For example, 34/// it might warn if a deprecated or unavailable declaration is being 35/// used, or produce an error (and return true) if a C++0x deleted 36/// function is being used. 37/// 38/// \returns true if there was an error (this declaration cannot be 39/// referenced), false otherwise. 40bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 41 // See if the decl is deprecated. 42 if (D->getAttr<DeprecatedAttr>()) { 43 // Implementing deprecated stuff requires referencing deprecated 44 // stuff. Don't warn if we are implementing a deprecated 45 // construct. 46 bool isSilenced = false; 47 48 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 49 // If this reference happens *in* a deprecated function or method, don't 50 // warn. 51 isSilenced = ND->getAttr<DeprecatedAttr>(); 52 53 // If this is an Objective-C method implementation, check to see if the 54 // method was deprecated on the declaration, not the definition. 55 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 56 // The semantic decl context of a ObjCMethodDecl is the 57 // ObjCImplementationDecl. 58 if (ObjCImplementationDecl *Impl 59 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 60 61 MD = Impl->getClassInterface()->getMethod(Context, 62 MD->getSelector(), 63 MD->isInstanceMethod()); 64 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); 65 } 66 } 67 } 68 69 if (!isSilenced) 70 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 71 } 72 73 // See if this is a deleted function. 74 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 75 if (FD->isDeleted()) { 76 Diag(Loc, diag::err_deleted_function_use); 77 Diag(D->getLocation(), diag::note_unavailable_here) << true; 78 return true; 79 } 80 } 81 82 // See if the decl is unavailable 83 if (D->getAttr<UnavailableAttr>()) { 84 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 85 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 86 } 87 88 return false; 89} 90 91SourceRange Sema::getExprRange(ExprTy *E) const { 92 Expr *Ex = (Expr *)E; 93 return Ex? Ex->getSourceRange() : SourceRange(); 94} 95 96//===----------------------------------------------------------------------===// 97// Standard Promotions and Conversions 98//===----------------------------------------------------------------------===// 99 100/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 101void Sema::DefaultFunctionArrayConversion(Expr *&E) { 102 QualType Ty = E->getType(); 103 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 104 105 if (Ty->isFunctionType()) 106 ImpCastExprToType(E, Context.getPointerType(Ty)); 107 else if (Ty->isArrayType()) { 108 // In C90 mode, arrays only promote to pointers if the array expression is 109 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 110 // type 'array of type' is converted to an expression that has type 'pointer 111 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 112 // that has type 'array of type' ...". The relevant change is "an lvalue" 113 // (C90) to "an expression" (C99). 114 // 115 // C++ 4.2p1: 116 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 117 // T" can be converted to an rvalue of type "pointer to T". 118 // 119 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 120 E->isLvalue(Context) == Expr::LV_Valid) 121 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 122 } 123} 124 125/// UsualUnaryConversions - Performs various conversions that are common to most 126/// operators (C99 6.3). The conversions of array and function types are 127/// sometimes surpressed. For example, the array->pointer conversion doesn't 128/// apply if the array is an argument to the sizeof or address (&) operators. 129/// In these instances, this routine should *not* be called. 130Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 131 QualType Ty = Expr->getType(); 132 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 133 134 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 135 ImpCastExprToType(Expr, Context.IntTy); 136 else 137 DefaultFunctionArrayConversion(Expr); 138 139 return Expr; 140} 141 142/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 143/// do not have a prototype. Arguments that have type float are promoted to 144/// double. All other argument types are converted by UsualUnaryConversions(). 145void Sema::DefaultArgumentPromotion(Expr *&Expr) { 146 QualType Ty = Expr->getType(); 147 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 148 149 // If this is a 'float' (CVR qualified or typedef) promote to double. 150 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 151 if (BT->getKind() == BuiltinType::Float) 152 return ImpCastExprToType(Expr, Context.DoubleTy); 153 154 UsualUnaryConversions(Expr); 155} 156 157/// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 158/// will warn if the resulting type is not a POD type, and rejects ObjC 159/// interfaces passed by value. This returns true if the argument type is 160/// completely illegal. 161bool Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 162 DefaultArgumentPromotion(Expr); 163 164 if (Expr->getType()->isObjCInterfaceType()) { 165 Diag(Expr->getLocStart(), 166 diag::err_cannot_pass_objc_interface_to_vararg) 167 << Expr->getType() << CT; 168 return true; 169 } 170 171 if (!Expr->getType()->isPODType()) 172 Diag(Expr->getLocStart(), diag::warn_cannot_pass_non_pod_arg_to_vararg) 173 << Expr->getType() << CT; 174 175 return false; 176} 177 178 179/// UsualArithmeticConversions - Performs various conversions that are common to 180/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 181/// routine returns the first non-arithmetic type found. The client is 182/// responsible for emitting appropriate error diagnostics. 183/// FIXME: verify the conversion rules for "complex int" are consistent with 184/// GCC. 185QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 186 bool isCompAssign) { 187 if (!isCompAssign) 188 UsualUnaryConversions(lhsExpr); 189 190 UsualUnaryConversions(rhsExpr); 191 192 // For conversion purposes, we ignore any qualifiers. 193 // For example, "const float" and "float" are equivalent. 194 QualType lhs = 195 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 196 QualType rhs = 197 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 198 199 // If both types are identical, no conversion is needed. 200 if (lhs == rhs) 201 return lhs; 202 203 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 204 // The caller can deal with this (e.g. pointer + int). 205 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 206 return lhs; 207 208 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 209 if (!isCompAssign) 210 ImpCastExprToType(lhsExpr, destType); 211 ImpCastExprToType(rhsExpr, destType); 212 return destType; 213} 214 215QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 216 // Perform the usual unary conversions. We do this early so that 217 // integral promotions to "int" can allow us to exit early, in the 218 // lhs == rhs check. Also, for conversion purposes, we ignore any 219 // qualifiers. For example, "const float" and "float" are 220 // equivalent. 221 if (lhs->isPromotableIntegerType()) 222 lhs = Context.IntTy; 223 else 224 lhs = lhs.getUnqualifiedType(); 225 if (rhs->isPromotableIntegerType()) 226 rhs = Context.IntTy; 227 else 228 rhs = rhs.getUnqualifiedType(); 229 230 // If both types are identical, no conversion is needed. 231 if (lhs == rhs) 232 return lhs; 233 234 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 235 // The caller can deal with this (e.g. pointer + int). 236 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 237 return lhs; 238 239 // At this point, we have two different arithmetic types. 240 241 // Handle complex types first (C99 6.3.1.8p1). 242 if (lhs->isComplexType() || rhs->isComplexType()) { 243 // if we have an integer operand, the result is the complex type. 244 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 245 // convert the rhs to the lhs complex type. 246 return lhs; 247 } 248 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 249 // convert the lhs to the rhs complex type. 250 return rhs; 251 } 252 // This handles complex/complex, complex/float, or float/complex. 253 // When both operands are complex, the shorter operand is converted to the 254 // type of the longer, and that is the type of the result. This corresponds 255 // to what is done when combining two real floating-point operands. 256 // The fun begins when size promotion occur across type domains. 257 // From H&S 6.3.4: When one operand is complex and the other is a real 258 // floating-point type, the less precise type is converted, within it's 259 // real or complex domain, to the precision of the other type. For example, 260 // when combining a "long double" with a "double _Complex", the 261 // "double _Complex" is promoted to "long double _Complex". 262 int result = Context.getFloatingTypeOrder(lhs, rhs); 263 264 if (result > 0) { // The left side is bigger, convert rhs. 265 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 266 } else if (result < 0) { // The right side is bigger, convert lhs. 267 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 268 } 269 // At this point, lhs and rhs have the same rank/size. Now, make sure the 270 // domains match. This is a requirement for our implementation, C99 271 // does not require this promotion. 272 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 273 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 274 return rhs; 275 } else { // handle "_Complex double, double". 276 return lhs; 277 } 278 } 279 return lhs; // The domain/size match exactly. 280 } 281 // Now handle "real" floating types (i.e. float, double, long double). 282 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 283 // if we have an integer operand, the result is the real floating type. 284 if (rhs->isIntegerType()) { 285 // convert rhs to the lhs floating point type. 286 return lhs; 287 } 288 if (rhs->isComplexIntegerType()) { 289 // convert rhs to the complex floating point type. 290 return Context.getComplexType(lhs); 291 } 292 if (lhs->isIntegerType()) { 293 // convert lhs to the rhs floating point type. 294 return rhs; 295 } 296 if (lhs->isComplexIntegerType()) { 297 // convert lhs to the complex floating point type. 298 return Context.getComplexType(rhs); 299 } 300 // We have two real floating types, float/complex combos were handled above. 301 // Convert the smaller operand to the bigger result. 302 int result = Context.getFloatingTypeOrder(lhs, rhs); 303 if (result > 0) // convert the rhs 304 return lhs; 305 assert(result < 0 && "illegal float comparison"); 306 return rhs; // convert the lhs 307 } 308 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 309 // Handle GCC complex int extension. 310 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 311 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 312 313 if (lhsComplexInt && rhsComplexInt) { 314 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 315 rhsComplexInt->getElementType()) >= 0) 316 return lhs; // convert the rhs 317 return rhs; 318 } else if (lhsComplexInt && rhs->isIntegerType()) { 319 // convert the rhs to the lhs complex type. 320 return lhs; 321 } else if (rhsComplexInt && lhs->isIntegerType()) { 322 // convert the lhs to the rhs complex type. 323 return rhs; 324 } 325 } 326 // Finally, we have two differing integer types. 327 // The rules for this case are in C99 6.3.1.8 328 int compare = Context.getIntegerTypeOrder(lhs, rhs); 329 bool lhsSigned = lhs->isSignedIntegerType(), 330 rhsSigned = rhs->isSignedIntegerType(); 331 QualType destType; 332 if (lhsSigned == rhsSigned) { 333 // Same signedness; use the higher-ranked type 334 destType = compare >= 0 ? lhs : rhs; 335 } else if (compare != (lhsSigned ? 1 : -1)) { 336 // The unsigned type has greater than or equal rank to the 337 // signed type, so use the unsigned type 338 destType = lhsSigned ? rhs : lhs; 339 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 340 // The two types are different widths; if we are here, that 341 // means the signed type is larger than the unsigned type, so 342 // use the signed type. 343 destType = lhsSigned ? lhs : rhs; 344 } else { 345 // The signed type is higher-ranked than the unsigned type, 346 // but isn't actually any bigger (like unsigned int and long 347 // on most 32-bit systems). Use the unsigned type corresponding 348 // to the signed type. 349 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 350 } 351 return destType; 352} 353 354//===----------------------------------------------------------------------===// 355// Semantic Analysis for various Expression Types 356//===----------------------------------------------------------------------===// 357 358 359/// ActOnStringLiteral - The specified tokens were lexed as pasted string 360/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 361/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 362/// multiple tokens. However, the common case is that StringToks points to one 363/// string. 364/// 365Action::OwningExprResult 366Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 367 assert(NumStringToks && "Must have at least one string!"); 368 369 StringLiteralParser Literal(StringToks, NumStringToks, PP); 370 if (Literal.hadError) 371 return ExprError(); 372 373 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 374 for (unsigned i = 0; i != NumStringToks; ++i) 375 StringTokLocs.push_back(StringToks[i].getLocation()); 376 377 QualType StrTy = Context.CharTy; 378 if (Literal.AnyWide) StrTy = Context.getWCharType(); 379 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 380 381 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 382 if (getLangOptions().CPlusPlus) 383 StrTy.addConst(); 384 385 // Get an array type for the string, according to C99 6.4.5. This includes 386 // the nul terminator character as well as the string length for pascal 387 // strings. 388 StrTy = Context.getConstantArrayType(StrTy, 389 llvm::APInt(32, Literal.GetNumStringChars()+1), 390 ArrayType::Normal, 0); 391 392 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 393 return Owned(StringLiteral::Create(Context, Literal.GetString(), 394 Literal.GetStringLength(), 395 Literal.AnyWide, StrTy, 396 &StringTokLocs[0], 397 StringTokLocs.size())); 398} 399 400/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 401/// CurBlock to VD should cause it to be snapshotted (as we do for auto 402/// variables defined outside the block) or false if this is not needed (e.g. 403/// for values inside the block or for globals). 404/// 405/// This also keeps the 'hasBlockDeclRefExprs' in the BlockSemaInfo records 406/// up-to-date. 407/// 408static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 409 ValueDecl *VD) { 410 // If the value is defined inside the block, we couldn't snapshot it even if 411 // we wanted to. 412 if (CurBlock->TheDecl == VD->getDeclContext()) 413 return false; 414 415 // If this is an enum constant or function, it is constant, don't snapshot. 416 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 417 return false; 418 419 // If this is a reference to an extern, static, or global variable, no need to 420 // snapshot it. 421 // FIXME: What about 'const' variables in C++? 422 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 423 if (!Var->hasLocalStorage()) 424 return false; 425 426 // Blocks that have these can't be constant. 427 CurBlock->hasBlockDeclRefExprs = true; 428 429 // If we have nested blocks, the decl may be declared in an outer block (in 430 // which case that outer block doesn't get "hasBlockDeclRefExprs") or it may 431 // be defined outside all of the current blocks (in which case the blocks do 432 // all get the bit). Walk the nesting chain. 433 for (BlockSemaInfo *NextBlock = CurBlock->PrevBlockInfo; NextBlock; 434 NextBlock = NextBlock->PrevBlockInfo) { 435 // If we found the defining block for the variable, don't mark the block as 436 // having a reference outside it. 437 if (NextBlock->TheDecl == VD->getDeclContext()) 438 break; 439 440 // Otherwise, the DeclRef from the inner block causes the outer one to need 441 // a snapshot as well. 442 NextBlock->hasBlockDeclRefExprs = true; 443 } 444 445 return true; 446} 447 448 449 450/// ActOnIdentifierExpr - The parser read an identifier in expression context, 451/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 452/// identifier is used in a function call context. 453/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 454/// class or namespace that the identifier must be a member of. 455Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 456 IdentifierInfo &II, 457 bool HasTrailingLParen, 458 const CXXScopeSpec *SS, 459 bool isAddressOfOperand) { 460 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 461 isAddressOfOperand); 462} 463 464/// BuildDeclRefExpr - Build either a DeclRefExpr or a 465/// QualifiedDeclRefExpr based on whether or not SS is a 466/// nested-name-specifier. 467DeclRefExpr * 468Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 469 bool TypeDependent, bool ValueDependent, 470 const CXXScopeSpec *SS) { 471 if (SS && !SS->isEmpty()) { 472 return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 473 ValueDependent, SS->getRange(), 474 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 475 } else 476 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 477} 478 479/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 480/// variable corresponding to the anonymous union or struct whose type 481/// is Record. 482static Decl *getObjectForAnonymousRecordDecl(ASTContext &Context, 483 RecordDecl *Record) { 484 assert(Record->isAnonymousStructOrUnion() && 485 "Record must be an anonymous struct or union!"); 486 487 // FIXME: Once Decls are directly linked together, this will 488 // be an O(1) operation rather than a slow walk through DeclContext's 489 // vector (which itself will be eliminated). DeclGroups might make 490 // this even better. 491 DeclContext *Ctx = Record->getDeclContext(); 492 for (DeclContext::decl_iterator D = Ctx->decls_begin(Context), 493 DEnd = Ctx->decls_end(Context); 494 D != DEnd; ++D) { 495 if (*D == Record) { 496 // The object for the anonymous struct/union directly 497 // follows its type in the list of declarations. 498 ++D; 499 assert(D != DEnd && "Missing object for anonymous record"); 500 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 501 return *D; 502 } 503 } 504 505 assert(false && "Missing object for anonymous record"); 506 return 0; 507} 508 509/// \brief Given a field that represents a member of an anonymous 510/// struct/union, build the path from that field's context to the 511/// actual member. 512/// 513/// Construct the sequence of field member references we'll have to 514/// perform to get to the field in the anonymous union/struct. The 515/// list of members is built from the field outward, so traverse it 516/// backwards to go from an object in the current context to the field 517/// we found. 518/// 519/// \returns The variable from which the field access should begin, 520/// for an anonymous struct/union that is not a member of another 521/// class. Otherwise, returns NULL. 522VarDecl *Sema::BuildAnonymousStructUnionMemberPath(FieldDecl *Field, 523 llvm::SmallVectorImpl<FieldDecl *> &Path) { 524 assert(Field->getDeclContext()->isRecord() && 525 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 526 && "Field must be stored inside an anonymous struct or union"); 527 528 Path.push_back(Field); 529 VarDecl *BaseObject = 0; 530 DeclContext *Ctx = Field->getDeclContext(); 531 do { 532 RecordDecl *Record = cast<RecordDecl>(Ctx); 533 Decl *AnonObject = getObjectForAnonymousRecordDecl(Context, Record); 534 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 535 Path.push_back(AnonField); 536 else { 537 BaseObject = cast<VarDecl>(AnonObject); 538 break; 539 } 540 Ctx = Ctx->getParent(); 541 } while (Ctx->isRecord() && 542 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 543 544 return BaseObject; 545} 546 547Sema::OwningExprResult 548Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 549 FieldDecl *Field, 550 Expr *BaseObjectExpr, 551 SourceLocation OpLoc) { 552 llvm::SmallVector<FieldDecl *, 4> AnonFields; 553 VarDecl *BaseObject = BuildAnonymousStructUnionMemberPath(Field, 554 AnonFields); 555 556 // Build the expression that refers to the base object, from 557 // which we will build a sequence of member references to each 558 // of the anonymous union objects and, eventually, the field we 559 // found via name lookup. 560 bool BaseObjectIsPointer = false; 561 unsigned ExtraQuals = 0; 562 if (BaseObject) { 563 // BaseObject is an anonymous struct/union variable (and is, 564 // therefore, not part of another non-anonymous record). 565 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 566 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 567 SourceLocation()); 568 ExtraQuals 569 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 570 } else if (BaseObjectExpr) { 571 // The caller provided the base object expression. Determine 572 // whether its a pointer and whether it adds any qualifiers to the 573 // anonymous struct/union fields we're looking into. 574 QualType ObjectType = BaseObjectExpr->getType(); 575 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 576 BaseObjectIsPointer = true; 577 ObjectType = ObjectPtr->getPointeeType(); 578 } 579 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 580 } else { 581 // We've found a member of an anonymous struct/union that is 582 // inside a non-anonymous struct/union, so in a well-formed 583 // program our base object expression is "this". 584 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 585 if (!MD->isStatic()) { 586 QualType AnonFieldType 587 = Context.getTagDeclType( 588 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 589 QualType ThisType = Context.getTagDeclType(MD->getParent()); 590 if ((Context.getCanonicalType(AnonFieldType) 591 == Context.getCanonicalType(ThisType)) || 592 IsDerivedFrom(ThisType, AnonFieldType)) { 593 // Our base object expression is "this". 594 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 595 MD->getThisType(Context)); 596 BaseObjectIsPointer = true; 597 } 598 } else { 599 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 600 << Field->getDeclName()); 601 } 602 ExtraQuals = MD->getTypeQualifiers(); 603 } 604 605 if (!BaseObjectExpr) 606 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 607 << Field->getDeclName()); 608 } 609 610 // Build the implicit member references to the field of the 611 // anonymous struct/union. 612 Expr *Result = BaseObjectExpr; 613 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 614 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 615 FI != FIEnd; ++FI) { 616 QualType MemberType = (*FI)->getType(); 617 if (!(*FI)->isMutable()) { 618 unsigned combinedQualifiers 619 = MemberType.getCVRQualifiers() | ExtraQuals; 620 MemberType = MemberType.getQualifiedType(combinedQualifiers); 621 } 622 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 623 OpLoc, MemberType); 624 BaseObjectIsPointer = false; 625 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 626 } 627 628 return Owned(Result); 629} 630 631/// ActOnDeclarationNameExpr - The parser has read some kind of name 632/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 633/// performs lookup on that name and returns an expression that refers 634/// to that name. This routine isn't directly called from the parser, 635/// because the parser doesn't know about DeclarationName. Rather, 636/// this routine is called by ActOnIdentifierExpr, 637/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 638/// which form the DeclarationName from the corresponding syntactic 639/// forms. 640/// 641/// HasTrailingLParen indicates whether this identifier is used in a 642/// function call context. LookupCtx is only used for a C++ 643/// qualified-id (foo::bar) to indicate the class or namespace that 644/// the identifier must be a member of. 645/// 646/// isAddressOfOperand means that this expression is the direct operand 647/// of an address-of operator. This matters because this is the only 648/// situation where a qualified name referencing a non-static member may 649/// appear outside a member function of this class. 650Sema::OwningExprResult 651Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 652 DeclarationName Name, bool HasTrailingLParen, 653 const CXXScopeSpec *SS, 654 bool isAddressOfOperand) { 655 // Could be enum-constant, value decl, instance variable, etc. 656 if (SS && SS->isInvalid()) 657 return ExprError(); 658 659 // C++ [temp.dep.expr]p3: 660 // An id-expression is type-dependent if it contains: 661 // -- a nested-name-specifier that contains a class-name that 662 // names a dependent type. 663 if (SS && isDependentScopeSpecifier(*SS)) { 664 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 665 Loc, SS->getRange(), 666 static_cast<NestedNameSpecifier *>(SS->getScopeRep()))); 667 } 668 669 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 670 false, true, Loc); 671 672 NamedDecl *D = 0; 673 if (Lookup.isAmbiguous()) { 674 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 675 SS && SS->isSet() ? SS->getRange() 676 : SourceRange()); 677 return ExprError(); 678 } else 679 D = Lookup.getAsDecl(); 680 681 // If this reference is in an Objective-C method, then ivar lookup happens as 682 // well. 683 IdentifierInfo *II = Name.getAsIdentifierInfo(); 684 if (II && getCurMethodDecl()) { 685 // There are two cases to handle here. 1) scoped lookup could have failed, 686 // in which case we should look for an ivar. 2) scoped lookup could have 687 // found a decl, but that decl is outside the current instance method (i.e. 688 // a global variable). In these two cases, we do a lookup for an ivar with 689 // this name, if the lookup sucedes, we replace it our current decl. 690 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 691 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 692 ObjCInterfaceDecl *ClassDeclared; 693 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 694 ClassDeclared)) { 695 // Check if referencing a field with __attribute__((deprecated)). 696 if (DiagnoseUseOfDecl(IV, Loc)) 697 return ExprError(); 698 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 699 // If a class method attemps to use a free standing ivar, this is 700 // an error. 701 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 702 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 703 << IV->getDeclName()); 704 // If a class method uses a global variable, even if an ivar with 705 // same name exists, use the global. 706 if (!IsClsMethod) { 707 if (IV->getAccessControl() == ObjCIvarDecl::Private && 708 ClassDeclared != IFace) 709 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 710 // FIXME: This should use a new expr for a direct reference, don't turn 711 // this into Self->ivar, just return a BareIVarExpr or something. 712 IdentifierInfo &II = Context.Idents.get("self"); 713 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 714 return Owned(new (Context) 715 ObjCIvarRefExpr(IV, IV->getType(), Loc, 716 static_cast<Expr*>(SelfExpr.release()), 717 true, true)); 718 } 719 } 720 } 721 else if (getCurMethodDecl()->isInstanceMethod()) { 722 // We should warn if a local variable hides an ivar. 723 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 724 ObjCInterfaceDecl *ClassDeclared; 725 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 726 ClassDeclared)) { 727 if (IV->getAccessControl() != ObjCIvarDecl::Private || 728 IFace == ClassDeclared) 729 Diag(Loc, diag::warn_ivar_use_hidden)<<IV->getDeclName(); 730 } 731 } 732 // Needed to implement property "super.method" notation. 733 if (D == 0 && II->isStr("super")) { 734 QualType T; 735 736 if (getCurMethodDecl()->isInstanceMethod()) 737 T = Context.getPointerType(Context.getObjCInterfaceType( 738 getCurMethodDecl()->getClassInterface())); 739 else 740 T = Context.getObjCClassType(); 741 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 742 } 743 } 744 745 // Determine whether this name might be a candidate for 746 // argument-dependent lookup. 747 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 748 HasTrailingLParen; 749 750 if (ADL && D == 0) { 751 // We've seen something of the form 752 // 753 // identifier( 754 // 755 // and we did not find any entity by the name 756 // "identifier". However, this identifier is still subject to 757 // argument-dependent lookup, so keep track of the name. 758 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 759 Context.OverloadTy, 760 Loc)); 761 } 762 763 if (D == 0) { 764 // Otherwise, this could be an implicitly declared function reference (legal 765 // in C90, extension in C99). 766 if (HasTrailingLParen && II && 767 !getLangOptions().CPlusPlus) // Not in C++. 768 D = ImplicitlyDefineFunction(Loc, *II, S); 769 else { 770 // If this name wasn't predeclared and if this is not a function call, 771 // diagnose the problem. 772 if (SS && !SS->isEmpty()) 773 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 774 << Name << SS->getRange()); 775 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 776 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 777 return ExprError(Diag(Loc, diag::err_undeclared_use) 778 << Name.getAsString()); 779 else 780 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 781 } 782 } 783 784 // If this is an expression of the form &Class::member, don't build an 785 // implicit member ref, because we want a pointer to the member in general, 786 // not any specific instance's member. 787 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 788 DeclContext *DC = computeDeclContext(*SS); 789 if (D && isa<CXXRecordDecl>(DC)) { 790 QualType DType; 791 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 792 DType = FD->getType().getNonReferenceType(); 793 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 794 DType = Method->getType(); 795 } else if (isa<OverloadedFunctionDecl>(D)) { 796 DType = Context.OverloadTy; 797 } 798 // Could be an inner type. That's diagnosed below, so ignore it here. 799 if (!DType.isNull()) { 800 // The pointer is type- and value-dependent if it points into something 801 // dependent. 802 bool Dependent = false; 803 for (; DC; DC = DC->getParent()) { 804 // FIXME: could stop early at namespace scope. 805 if (DC->isRecord()) { 806 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 807 if (Context.getTypeDeclType(Record)->isDependentType()) { 808 Dependent = true; 809 break; 810 } 811 } 812 } 813 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 814 } 815 } 816 } 817 818 // We may have found a field within an anonymous union or struct 819 // (C++ [class.union]). 820 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 821 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 822 return BuildAnonymousStructUnionMemberReference(Loc, FD); 823 824 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 825 if (!MD->isStatic()) { 826 // C++ [class.mfct.nonstatic]p2: 827 // [...] if name lookup (3.4.1) resolves the name in the 828 // id-expression to a nonstatic nontype member of class X or of 829 // a base class of X, the id-expression is transformed into a 830 // class member access expression (5.2.5) using (*this) (9.3.2) 831 // as the postfix-expression to the left of the '.' operator. 832 DeclContext *Ctx = 0; 833 QualType MemberType; 834 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 835 Ctx = FD->getDeclContext(); 836 MemberType = FD->getType(); 837 838 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 839 MemberType = RefType->getPointeeType(); 840 else if (!FD->isMutable()) { 841 unsigned combinedQualifiers 842 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 843 MemberType = MemberType.getQualifiedType(combinedQualifiers); 844 } 845 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 846 if (!Method->isStatic()) { 847 Ctx = Method->getParent(); 848 MemberType = Method->getType(); 849 } 850 } else if (OverloadedFunctionDecl *Ovl 851 = dyn_cast<OverloadedFunctionDecl>(D)) { 852 for (OverloadedFunctionDecl::function_iterator 853 Func = Ovl->function_begin(), 854 FuncEnd = Ovl->function_end(); 855 Func != FuncEnd; ++Func) { 856 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 857 if (!DMethod->isStatic()) { 858 Ctx = Ovl->getDeclContext(); 859 MemberType = Context.OverloadTy; 860 break; 861 } 862 } 863 } 864 865 if (Ctx && Ctx->isRecord()) { 866 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 867 QualType ThisType = Context.getTagDeclType(MD->getParent()); 868 if ((Context.getCanonicalType(CtxType) 869 == Context.getCanonicalType(ThisType)) || 870 IsDerivedFrom(ThisType, CtxType)) { 871 // Build the implicit member access expression. 872 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 873 MD->getThisType(Context)); 874 return Owned(new (Context) MemberExpr(This, true, D, 875 SourceLocation(), MemberType)); 876 } 877 } 878 } 879 } 880 881 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 882 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 883 if (MD->isStatic()) 884 // "invalid use of member 'x' in static member function" 885 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 886 << FD->getDeclName()); 887 } 888 889 // Any other ways we could have found the field in a well-formed 890 // program would have been turned into implicit member expressions 891 // above. 892 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 893 << FD->getDeclName()); 894 } 895 896 if (isa<TypedefDecl>(D)) 897 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 898 if (isa<ObjCInterfaceDecl>(D)) 899 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 900 if (isa<NamespaceDecl>(D)) 901 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 902 903 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 904 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 905 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 906 false, false, SS)); 907 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 908 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 909 false, false, SS)); 910 ValueDecl *VD = cast<ValueDecl>(D); 911 912 // Check whether this declaration can be used. Note that we suppress 913 // this check when we're going to perform argument-dependent lookup 914 // on this function name, because this might not be the function 915 // that overload resolution actually selects. 916 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 917 return ExprError(); 918 919 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 920 // Warn about constructs like: 921 // if (void *X = foo()) { ... } else { X }. 922 // In the else block, the pointer is always false. 923 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 924 Scope *CheckS = S; 925 while (CheckS) { 926 if (CheckS->isWithinElse() && 927 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 928 if (Var->getType()->isBooleanType()) 929 ExprError(Diag(Loc, diag::warn_value_always_false) 930 << Var->getDeclName()); 931 else 932 ExprError(Diag(Loc, diag::warn_value_always_zero) 933 << Var->getDeclName()); 934 break; 935 } 936 937 // Move up one more control parent to check again. 938 CheckS = CheckS->getControlParent(); 939 if (CheckS) 940 CheckS = CheckS->getParent(); 941 } 942 } 943 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 944 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 945 // C99 DR 316 says that, if a function type comes from a 946 // function definition (without a prototype), that type is only 947 // used for checking compatibility. Therefore, when referencing 948 // the function, we pretend that we don't have the full function 949 // type. 950 QualType T = Func->getType(); 951 QualType NoProtoType = T; 952 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 953 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 954 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 955 } 956 } 957 958 // Only create DeclRefExpr's for valid Decl's. 959 if (VD->isInvalidDecl()) 960 return ExprError(); 961 962 // If the identifier reference is inside a block, and it refers to a value 963 // that is outside the block, create a BlockDeclRefExpr instead of a 964 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 965 // the block is formed. 966 // 967 // We do not do this for things like enum constants, global variables, etc, 968 // as they do not get snapshotted. 969 // 970 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 971 QualType ExprTy = VD->getType().getNonReferenceType(); 972 // The BlocksAttr indicates the variable is bound by-reference. 973 if (VD->getAttr<BlocksAttr>()) 974 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 975 976 // Variable will be bound by-copy, make it const within the closure. 977 ExprTy.addConst(); 978 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false)); 979 } 980 // If this reference is not in a block or if the referenced variable is 981 // within the block, create a normal DeclRefExpr. 982 983 bool TypeDependent = false; 984 bool ValueDependent = false; 985 if (getLangOptions().CPlusPlus) { 986 // C++ [temp.dep.expr]p3: 987 // An id-expression is type-dependent if it contains: 988 // - an identifier that was declared with a dependent type, 989 if (VD->getType()->isDependentType()) 990 TypeDependent = true; 991 // - FIXME: a template-id that is dependent, 992 // - a conversion-function-id that specifies a dependent type, 993 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 994 Name.getCXXNameType()->isDependentType()) 995 TypeDependent = true; 996 // - a nested-name-specifier that contains a class-name that 997 // names a dependent type. 998 else if (SS && !SS->isEmpty()) { 999 for (DeclContext *DC = computeDeclContext(*SS); 1000 DC; DC = DC->getParent()) { 1001 // FIXME: could stop early at namespace scope. 1002 if (DC->isRecord()) { 1003 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1004 if (Context.getTypeDeclType(Record)->isDependentType()) { 1005 TypeDependent = true; 1006 break; 1007 } 1008 } 1009 } 1010 } 1011 1012 // C++ [temp.dep.constexpr]p2: 1013 // 1014 // An identifier is value-dependent if it is: 1015 // - a name declared with a dependent type, 1016 if (TypeDependent) 1017 ValueDependent = true; 1018 // - the name of a non-type template parameter, 1019 else if (isa<NonTypeTemplateParmDecl>(VD)) 1020 ValueDependent = true; 1021 // - a constant with integral or enumeration type and is 1022 // initialized with an expression that is value-dependent 1023 // (FIXME!). 1024 } 1025 1026 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1027 TypeDependent, ValueDependent, SS)); 1028} 1029 1030Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1031 tok::TokenKind Kind) { 1032 PredefinedExpr::IdentType IT; 1033 1034 switch (Kind) { 1035 default: assert(0 && "Unknown simple primary expr!"); 1036 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1037 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1038 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1039 } 1040 1041 // Pre-defined identifiers are of type char[x], where x is the length of the 1042 // string. 1043 unsigned Length; 1044 if (FunctionDecl *FD = getCurFunctionDecl()) 1045 Length = FD->getIdentifier()->getLength(); 1046 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1047 Length = MD->getSynthesizedMethodSize(); 1048 else { 1049 Diag(Loc, diag::ext_predef_outside_function); 1050 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1051 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1052 } 1053 1054 1055 llvm::APInt LengthI(32, Length + 1); 1056 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1057 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1058 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1059} 1060 1061Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1062 llvm::SmallString<16> CharBuffer; 1063 CharBuffer.resize(Tok.getLength()); 1064 const char *ThisTokBegin = &CharBuffer[0]; 1065 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1066 1067 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1068 Tok.getLocation(), PP); 1069 if (Literal.hadError()) 1070 return ExprError(); 1071 1072 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1073 1074 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1075 Literal.isWide(), 1076 type, Tok.getLocation())); 1077} 1078 1079Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1080 // Fast path for a single digit (which is quite common). A single digit 1081 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1082 if (Tok.getLength() == 1) { 1083 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1084 unsigned IntSize = Context.Target.getIntWidth(); 1085 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1086 Context.IntTy, Tok.getLocation())); 1087 } 1088 1089 llvm::SmallString<512> IntegerBuffer; 1090 // Add padding so that NumericLiteralParser can overread by one character. 1091 IntegerBuffer.resize(Tok.getLength()+1); 1092 const char *ThisTokBegin = &IntegerBuffer[0]; 1093 1094 // Get the spelling of the token, which eliminates trigraphs, etc. 1095 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1096 1097 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1098 Tok.getLocation(), PP); 1099 if (Literal.hadError) 1100 return ExprError(); 1101 1102 Expr *Res; 1103 1104 if (Literal.isFloatingLiteral()) { 1105 QualType Ty; 1106 if (Literal.isFloat) 1107 Ty = Context.FloatTy; 1108 else if (!Literal.isLong) 1109 Ty = Context.DoubleTy; 1110 else 1111 Ty = Context.LongDoubleTy; 1112 1113 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1114 1115 // isExact will be set by GetFloatValue(). 1116 bool isExact = false; 1117 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1118 &isExact, Ty, Tok.getLocation()); 1119 1120 } else if (!Literal.isIntegerLiteral()) { 1121 return ExprError(); 1122 } else { 1123 QualType Ty; 1124 1125 // long long is a C99 feature. 1126 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1127 Literal.isLongLong) 1128 Diag(Tok.getLocation(), diag::ext_longlong); 1129 1130 // Get the value in the widest-possible width. 1131 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1132 1133 if (Literal.GetIntegerValue(ResultVal)) { 1134 // If this value didn't fit into uintmax_t, warn and force to ull. 1135 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1136 Ty = Context.UnsignedLongLongTy; 1137 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1138 "long long is not intmax_t?"); 1139 } else { 1140 // If this value fits into a ULL, try to figure out what else it fits into 1141 // according to the rules of C99 6.4.4.1p5. 1142 1143 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1144 // be an unsigned int. 1145 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1146 1147 // Check from smallest to largest, picking the smallest type we can. 1148 unsigned Width = 0; 1149 if (!Literal.isLong && !Literal.isLongLong) { 1150 // Are int/unsigned possibilities? 1151 unsigned IntSize = Context.Target.getIntWidth(); 1152 1153 // Does it fit in a unsigned int? 1154 if (ResultVal.isIntN(IntSize)) { 1155 // Does it fit in a signed int? 1156 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1157 Ty = Context.IntTy; 1158 else if (AllowUnsigned) 1159 Ty = Context.UnsignedIntTy; 1160 Width = IntSize; 1161 } 1162 } 1163 1164 // Are long/unsigned long possibilities? 1165 if (Ty.isNull() && !Literal.isLongLong) { 1166 unsigned LongSize = Context.Target.getLongWidth(); 1167 1168 // Does it fit in a unsigned long? 1169 if (ResultVal.isIntN(LongSize)) { 1170 // Does it fit in a signed long? 1171 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1172 Ty = Context.LongTy; 1173 else if (AllowUnsigned) 1174 Ty = Context.UnsignedLongTy; 1175 Width = LongSize; 1176 } 1177 } 1178 1179 // Finally, check long long if needed. 1180 if (Ty.isNull()) { 1181 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1182 1183 // Does it fit in a unsigned long long? 1184 if (ResultVal.isIntN(LongLongSize)) { 1185 // Does it fit in a signed long long? 1186 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1187 Ty = Context.LongLongTy; 1188 else if (AllowUnsigned) 1189 Ty = Context.UnsignedLongLongTy; 1190 Width = LongLongSize; 1191 } 1192 } 1193 1194 // If we still couldn't decide a type, we probably have something that 1195 // does not fit in a signed long long, but has no U suffix. 1196 if (Ty.isNull()) { 1197 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1198 Ty = Context.UnsignedLongLongTy; 1199 Width = Context.Target.getLongLongWidth(); 1200 } 1201 1202 if (ResultVal.getBitWidth() != Width) 1203 ResultVal.trunc(Width); 1204 } 1205 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1206 } 1207 1208 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1209 if (Literal.isImaginary) 1210 Res = new (Context) ImaginaryLiteral(Res, 1211 Context.getComplexType(Res->getType())); 1212 1213 return Owned(Res); 1214} 1215 1216Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1217 SourceLocation R, ExprArg Val) { 1218 Expr *E = (Expr *)Val.release(); 1219 assert((E != 0) && "ActOnParenExpr() missing expr"); 1220 return Owned(new (Context) ParenExpr(L, R, E)); 1221} 1222 1223/// The UsualUnaryConversions() function is *not* called by this routine. 1224/// See C99 6.3.2.1p[2-4] for more details. 1225bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1226 SourceLocation OpLoc, 1227 const SourceRange &ExprRange, 1228 bool isSizeof) { 1229 if (exprType->isDependentType()) 1230 return false; 1231 1232 // C99 6.5.3.4p1: 1233 if (isa<FunctionType>(exprType)) { 1234 // alignof(function) is allowed as an extension. 1235 if (isSizeof) 1236 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1237 return false; 1238 } 1239 1240 // Allow sizeof(void)/alignof(void) as an extension. 1241 if (exprType->isVoidType()) { 1242 Diag(OpLoc, diag::ext_sizeof_void_type) 1243 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1244 return false; 1245 } 1246 1247 if (RequireCompleteType(OpLoc, exprType, 1248 isSizeof ? diag::err_sizeof_incomplete_type : 1249 diag::err_alignof_incomplete_type, 1250 ExprRange)) 1251 return true; 1252 1253 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1254 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1255 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1256 << exprType << isSizeof; 1257 return false; 1258 } 1259 1260 return false; 1261} 1262 1263bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1264 const SourceRange &ExprRange) { 1265 E = E->IgnoreParens(); 1266 1267 // alignof decl is always ok. 1268 if (isa<DeclRefExpr>(E)) 1269 return false; 1270 1271 // Cannot know anything else if the expression is dependent. 1272 if (E->isTypeDependent()) 1273 return false; 1274 1275 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1276 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { 1277 if (FD->isBitField()) { 1278 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1279 return true; 1280 } 1281 // Other fields are ok. 1282 return false; 1283 } 1284 } 1285 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1286} 1287 1288/// \brief Build a sizeof or alignof expression given a type operand. 1289Action::OwningExprResult 1290Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1291 bool isSizeOf, SourceRange R) { 1292 if (T.isNull()) 1293 return ExprError(); 1294 1295 if (!T->isDependentType() && 1296 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1297 return ExprError(); 1298 1299 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1300 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1301 Context.getSizeType(), OpLoc, 1302 R.getEnd())); 1303} 1304 1305/// \brief Build a sizeof or alignof expression given an expression 1306/// operand. 1307Action::OwningExprResult 1308Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1309 bool isSizeOf, SourceRange R) { 1310 // Verify that the operand is valid. 1311 bool isInvalid = false; 1312 if (E->isTypeDependent()) { 1313 // Delay type-checking for type-dependent expressions. 1314 } else if (!isSizeOf) { 1315 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1316 } else if (E->isBitField()) { // C99 6.5.3.4p1. 1317 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1318 isInvalid = true; 1319 } else { 1320 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1321 } 1322 1323 if (isInvalid) 1324 return ExprError(); 1325 1326 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1327 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1328 Context.getSizeType(), OpLoc, 1329 R.getEnd())); 1330} 1331 1332/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1333/// the same for @c alignof and @c __alignof 1334/// Note that the ArgRange is invalid if isType is false. 1335Action::OwningExprResult 1336Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1337 void *TyOrEx, const SourceRange &ArgRange) { 1338 // If error parsing type, ignore. 1339 if (TyOrEx == 0) return ExprError(); 1340 1341 if (isType) { 1342 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1343 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1344 } 1345 1346 // Get the end location. 1347 Expr *ArgEx = (Expr *)TyOrEx; 1348 Action::OwningExprResult Result 1349 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1350 1351 if (Result.isInvalid()) 1352 DeleteExpr(ArgEx); 1353 1354 return move(Result); 1355} 1356 1357QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1358 if (V->isTypeDependent()) 1359 return Context.DependentTy; 1360 1361 // These operators return the element type of a complex type. 1362 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1363 return CT->getElementType(); 1364 1365 // Otherwise they pass through real integer and floating point types here. 1366 if (V->getType()->isArithmeticType()) 1367 return V->getType(); 1368 1369 // Reject anything else. 1370 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1371 << (isReal ? "__real" : "__imag"); 1372 return QualType(); 1373} 1374 1375 1376 1377Action::OwningExprResult 1378Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1379 tok::TokenKind Kind, ExprArg Input) { 1380 Expr *Arg = (Expr *)Input.get(); 1381 1382 UnaryOperator::Opcode Opc; 1383 switch (Kind) { 1384 default: assert(0 && "Unknown unary op!"); 1385 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1386 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1387 } 1388 1389 if (getLangOptions().CPlusPlus && 1390 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1391 // Which overloaded operator? 1392 OverloadedOperatorKind OverOp = 1393 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1394 1395 // C++ [over.inc]p1: 1396 // 1397 // [...] If the function is a member function with one 1398 // parameter (which shall be of type int) or a non-member 1399 // function with two parameters (the second of which shall be 1400 // of type int), it defines the postfix increment operator ++ 1401 // for objects of that type. When the postfix increment is 1402 // called as a result of using the ++ operator, the int 1403 // argument will have value zero. 1404 Expr *Args[2] = { 1405 Arg, 1406 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1407 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1408 }; 1409 1410 // Build the candidate set for overloading 1411 OverloadCandidateSet CandidateSet; 1412 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1413 1414 // Perform overload resolution. 1415 OverloadCandidateSet::iterator Best; 1416 switch (BestViableFunction(CandidateSet, Best)) { 1417 case OR_Success: { 1418 // We found a built-in operator or an overloaded operator. 1419 FunctionDecl *FnDecl = Best->Function; 1420 1421 if (FnDecl) { 1422 // We matched an overloaded operator. Build a call to that 1423 // operator. 1424 1425 // Convert the arguments. 1426 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1427 if (PerformObjectArgumentInitialization(Arg, Method)) 1428 return ExprError(); 1429 } else { 1430 // Convert the arguments. 1431 if (PerformCopyInitialization(Arg, 1432 FnDecl->getParamDecl(0)->getType(), 1433 "passing")) 1434 return ExprError(); 1435 } 1436 1437 // Determine the result type 1438 QualType ResultTy 1439 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1440 ResultTy = ResultTy.getNonReferenceType(); 1441 1442 // Build the actual expression node. 1443 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1444 SourceLocation()); 1445 UsualUnaryConversions(FnExpr); 1446 1447 Input.release(); 1448 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1449 Args, 2, ResultTy, 1450 OpLoc)); 1451 } else { 1452 // We matched a built-in operator. Convert the arguments, then 1453 // break out so that we will build the appropriate built-in 1454 // operator node. 1455 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1456 "passing")) 1457 return ExprError(); 1458 1459 break; 1460 } 1461 } 1462 1463 case OR_No_Viable_Function: 1464 // No viable function; fall through to handling this as a 1465 // built-in operator, which will produce an error message for us. 1466 break; 1467 1468 case OR_Ambiguous: 1469 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1470 << UnaryOperator::getOpcodeStr(Opc) 1471 << Arg->getSourceRange(); 1472 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1473 return ExprError(); 1474 1475 case OR_Deleted: 1476 Diag(OpLoc, diag::err_ovl_deleted_oper) 1477 << Best->Function->isDeleted() 1478 << UnaryOperator::getOpcodeStr(Opc) 1479 << Arg->getSourceRange(); 1480 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1481 return ExprError(); 1482 } 1483 1484 // Either we found no viable overloaded operator or we matched a 1485 // built-in operator. In either case, fall through to trying to 1486 // build a built-in operation. 1487 } 1488 1489 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1490 Opc == UnaryOperator::PostInc); 1491 if (result.isNull()) 1492 return ExprError(); 1493 Input.release(); 1494 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1495} 1496 1497Action::OwningExprResult 1498Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1499 ExprArg Idx, SourceLocation RLoc) { 1500 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1501 *RHSExp = static_cast<Expr*>(Idx.get()); 1502 1503 if (getLangOptions().CPlusPlus && 1504 (LHSExp->getType()->isRecordType() || 1505 LHSExp->getType()->isEnumeralType() || 1506 RHSExp->getType()->isRecordType() || 1507 RHSExp->getType()->isEnumeralType())) { 1508 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1509 // to the candidate set. 1510 OverloadCandidateSet CandidateSet; 1511 Expr *Args[2] = { LHSExp, RHSExp }; 1512 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1513 SourceRange(LLoc, RLoc)); 1514 1515 // Perform overload resolution. 1516 OverloadCandidateSet::iterator Best; 1517 switch (BestViableFunction(CandidateSet, Best)) { 1518 case OR_Success: { 1519 // We found a built-in operator or an overloaded operator. 1520 FunctionDecl *FnDecl = Best->Function; 1521 1522 if (FnDecl) { 1523 // We matched an overloaded operator. Build a call to that 1524 // operator. 1525 1526 // Convert the arguments. 1527 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1528 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1529 PerformCopyInitialization(RHSExp, 1530 FnDecl->getParamDecl(0)->getType(), 1531 "passing")) 1532 return ExprError(); 1533 } else { 1534 // Convert the arguments. 1535 if (PerformCopyInitialization(LHSExp, 1536 FnDecl->getParamDecl(0)->getType(), 1537 "passing") || 1538 PerformCopyInitialization(RHSExp, 1539 FnDecl->getParamDecl(1)->getType(), 1540 "passing")) 1541 return ExprError(); 1542 } 1543 1544 // Determine the result type 1545 QualType ResultTy 1546 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1547 ResultTy = ResultTy.getNonReferenceType(); 1548 1549 // Build the actual expression node. 1550 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1551 SourceLocation()); 1552 UsualUnaryConversions(FnExpr); 1553 1554 Base.release(); 1555 Idx.release(); 1556 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1557 FnExpr, Args, 2, 1558 ResultTy, LLoc)); 1559 } else { 1560 // We matched a built-in operator. Convert the arguments, then 1561 // break out so that we will build the appropriate built-in 1562 // operator node. 1563 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1564 "passing") || 1565 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1566 "passing")) 1567 return ExprError(); 1568 1569 break; 1570 } 1571 } 1572 1573 case OR_No_Viable_Function: 1574 // No viable function; fall through to handling this as a 1575 // built-in operator, which will produce an error message for us. 1576 break; 1577 1578 case OR_Ambiguous: 1579 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1580 << "[]" 1581 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1582 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1583 return ExprError(); 1584 1585 case OR_Deleted: 1586 Diag(LLoc, diag::err_ovl_deleted_oper) 1587 << Best->Function->isDeleted() 1588 << "[]" 1589 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1590 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1591 return ExprError(); 1592 } 1593 1594 // Either we found no viable overloaded operator or we matched a 1595 // built-in operator. In either case, fall through to trying to 1596 // build a built-in operation. 1597 } 1598 1599 // Perform default conversions. 1600 DefaultFunctionArrayConversion(LHSExp); 1601 DefaultFunctionArrayConversion(RHSExp); 1602 1603 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1604 1605 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1606 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1607 // in the subscript position. As a result, we need to derive the array base 1608 // and index from the expression types. 1609 Expr *BaseExpr, *IndexExpr; 1610 QualType ResultType; 1611 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1612 BaseExpr = LHSExp; 1613 IndexExpr = RHSExp; 1614 ResultType = Context.DependentTy; 1615 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1616 BaseExpr = LHSExp; 1617 IndexExpr = RHSExp; 1618 // FIXME: need to deal with const... 1619 ResultType = PTy->getPointeeType(); 1620 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1621 // Handle the uncommon case of "123[Ptr]". 1622 BaseExpr = RHSExp; 1623 IndexExpr = LHSExp; 1624 // FIXME: need to deal with const... 1625 ResultType = PTy->getPointeeType(); 1626 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1627 BaseExpr = LHSExp; // vectors: V[123] 1628 IndexExpr = RHSExp; 1629 1630 // FIXME: need to deal with const... 1631 ResultType = VTy->getElementType(); 1632 } else { 1633 return ExprError(Diag(LHSExp->getLocStart(), 1634 diag::err_typecheck_subscript_value) << RHSExp->getSourceRange()); 1635 } 1636 // C99 6.5.2.1p1 1637 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1638 return ExprError(Diag(IndexExpr->getLocStart(), 1639 diag::err_typecheck_subscript) << IndexExpr->getSourceRange()); 1640 1641 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1642 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1643 // type. Note that Functions are not objects, and that (in C99 parlance) 1644 // incomplete types are not object types. 1645 if (ResultType->isFunctionType()) { 1646 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1647 << ResultType << BaseExpr->getSourceRange(); 1648 return ExprError(); 1649 } 1650 1651 if (!ResultType->isDependentType() && 1652 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, 1653 BaseExpr->getSourceRange())) 1654 return ExprError(); 1655 1656 // Diagnose bad cases where we step over interface counts. 1657 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1658 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1659 << ResultType << BaseExpr->getSourceRange(); 1660 return ExprError(); 1661 } 1662 1663 Base.release(); 1664 Idx.release(); 1665 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1666 ResultType, RLoc)); 1667} 1668 1669QualType Sema:: 1670CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1671 IdentifierInfo &CompName, SourceLocation CompLoc) { 1672 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1673 1674 // The vector accessor can't exceed the number of elements. 1675 const char *compStr = CompName.getName(); 1676 1677 // This flag determines whether or not the component is one of the four 1678 // special names that indicate a subset of exactly half the elements are 1679 // to be selected. 1680 bool HalvingSwizzle = false; 1681 1682 // This flag determines whether or not CompName has an 's' char prefix, 1683 // indicating that it is a string of hex values to be used as vector indices. 1684 bool HexSwizzle = *compStr == 's'; 1685 1686 // Check that we've found one of the special components, or that the component 1687 // names must come from the same set. 1688 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1689 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1690 HalvingSwizzle = true; 1691 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1692 do 1693 compStr++; 1694 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1695 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1696 do 1697 compStr++; 1698 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1699 } 1700 1701 if (!HalvingSwizzle && *compStr) { 1702 // We didn't get to the end of the string. This means the component names 1703 // didn't come from the same set *or* we encountered an illegal name. 1704 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1705 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1706 return QualType(); 1707 } 1708 1709 // Ensure no component accessor exceeds the width of the vector type it 1710 // operates on. 1711 if (!HalvingSwizzle) { 1712 compStr = CompName.getName(); 1713 1714 if (HexSwizzle) 1715 compStr++; 1716 1717 while (*compStr) { 1718 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1719 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1720 << baseType << SourceRange(CompLoc); 1721 return QualType(); 1722 } 1723 } 1724 } 1725 1726 // If this is a halving swizzle, verify that the base type has an even 1727 // number of elements. 1728 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1729 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1730 << baseType << SourceRange(CompLoc); 1731 return QualType(); 1732 } 1733 1734 // The component accessor looks fine - now we need to compute the actual type. 1735 // The vector type is implied by the component accessor. For example, 1736 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1737 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1738 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1739 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1740 : CompName.getLength(); 1741 if (HexSwizzle) 1742 CompSize--; 1743 1744 if (CompSize == 1) 1745 return vecType->getElementType(); 1746 1747 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1748 // Now look up the TypeDefDecl from the vector type. Without this, 1749 // diagostics look bad. We want extended vector types to appear built-in. 1750 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1751 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1752 return Context.getTypedefType(ExtVectorDecls[i]); 1753 } 1754 return VT; // should never get here (a typedef type should always be found). 1755} 1756 1757static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1758 IdentifierInfo &Member, 1759 const Selector &Sel, 1760 ASTContext &Context) { 1761 1762 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Context, &Member)) 1763 return PD; 1764 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Context, Sel)) 1765 return OMD; 1766 1767 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1768 E = PDecl->protocol_end(); I != E; ++I) { 1769 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1770 Context)) 1771 return D; 1772 } 1773 return 0; 1774} 1775 1776static Decl *FindGetterNameDecl(const ObjCQualifiedIdType *QIdTy, 1777 IdentifierInfo &Member, 1778 const Selector &Sel, 1779 ASTContext &Context) { 1780 // Check protocols on qualified interfaces. 1781 Decl *GDecl = 0; 1782 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1783 E = QIdTy->qual_end(); I != E; ++I) { 1784 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, &Member)) { 1785 GDecl = PD; 1786 break; 1787 } 1788 // Also must look for a getter name which uses property syntax. 1789 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Context, Sel)) { 1790 GDecl = OMD; 1791 break; 1792 } 1793 } 1794 if (!GDecl) { 1795 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1796 E = QIdTy->qual_end(); I != E; ++I) { 1797 // Search in the protocol-qualifier list of current protocol. 1798 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 1799 if (GDecl) 1800 return GDecl; 1801 } 1802 } 1803 return GDecl; 1804} 1805 1806/// FindMethodInNestedImplementations - Look up a method in current and 1807/// all base class implementations. 1808/// 1809ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 1810 const ObjCInterfaceDecl *IFace, 1811 const Selector &Sel) { 1812 ObjCMethodDecl *Method = 0; 1813 if (ObjCImplementationDecl *ImpDecl 1814 = LookupObjCImplementation(IFace->getIdentifier())) 1815 Method = ImpDecl->getInstanceMethod(Context, Sel); 1816 1817 if (!Method && IFace->getSuperClass()) 1818 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 1819 return Method; 1820} 1821 1822Action::OwningExprResult 1823Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1824 tok::TokenKind OpKind, SourceLocation MemberLoc, 1825 IdentifierInfo &Member, 1826 DeclPtrTy ObjCImpDecl) { 1827 Expr *BaseExpr = static_cast<Expr *>(Base.release()); 1828 assert(BaseExpr && "no record expression"); 1829 1830 // Perform default conversions. 1831 DefaultFunctionArrayConversion(BaseExpr); 1832 1833 QualType BaseType = BaseExpr->getType(); 1834 assert(!BaseType.isNull() && "no type for member expression"); 1835 1836 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1837 // must have pointer type, and the accessed type is the pointee. 1838 if (OpKind == tok::arrow) { 1839 if (const PointerType *PT = BaseType->getAsPointerType()) 1840 BaseType = PT->getPointeeType(); 1841 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1842 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1843 MemberLoc, Member)); 1844 else 1845 return ExprError(Diag(MemberLoc, 1846 diag::err_typecheck_member_reference_arrow) 1847 << BaseType << BaseExpr->getSourceRange()); 1848 } 1849 1850 // Handle field access to simple records. This also handles access to fields 1851 // of the ObjC 'id' struct. 1852 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1853 RecordDecl *RDecl = RTy->getDecl(); 1854 if (RequireCompleteType(OpLoc, BaseType, 1855 diag::err_typecheck_incomplete_tag, 1856 BaseExpr->getSourceRange())) 1857 return ExprError(); 1858 1859 // The record definition is complete, now make sure the member is valid. 1860 // FIXME: Qualified name lookup for C++ is a bit more complicated 1861 // than this. 1862 LookupResult Result 1863 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1864 LookupMemberName, false); 1865 1866 if (!Result) 1867 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1868 << &Member << BaseExpr->getSourceRange()); 1869 if (Result.isAmbiguous()) { 1870 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1871 MemberLoc, BaseExpr->getSourceRange()); 1872 return ExprError(); 1873 } 1874 1875 NamedDecl *MemberDecl = Result; 1876 1877 // If the decl being referenced had an error, return an error for this 1878 // sub-expr without emitting another error, in order to avoid cascading 1879 // error cases. 1880 if (MemberDecl->isInvalidDecl()) 1881 return ExprError(); 1882 1883 // Check the use of this field 1884 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 1885 return ExprError(); 1886 1887 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1888 // We may have found a field within an anonymous union or struct 1889 // (C++ [class.union]). 1890 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1891 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1892 BaseExpr, OpLoc); 1893 1894 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1895 // FIXME: Handle address space modifiers 1896 QualType MemberType = FD->getType(); 1897 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1898 MemberType = Ref->getPointeeType(); 1899 else { 1900 unsigned combinedQualifiers = 1901 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1902 if (FD->isMutable()) 1903 combinedQualifiers &= ~QualType::Const; 1904 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1905 } 1906 1907 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1908 MemberLoc, MemberType)); 1909 } 1910 1911 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) 1912 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1913 Var, MemberLoc, 1914 Var->getType().getNonReferenceType())); 1915 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 1916 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1917 MemberFn, MemberLoc, 1918 MemberFn->getType())); 1919 if (OverloadedFunctionDecl *Ovl 1920 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 1921 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 1922 MemberLoc, Context.OverloadTy)); 1923 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 1924 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1925 Enum, MemberLoc, Enum->getType())); 1926 if (isa<TypeDecl>(MemberDecl)) 1927 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 1928 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1929 1930 // We found a declaration kind that we didn't expect. This is a 1931 // generic error message that tells the user that she can't refer 1932 // to this member with '.' or '->'. 1933 return ExprError(Diag(MemberLoc, 1934 diag::err_typecheck_member_reference_unknown) 1935 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1936 } 1937 1938 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1939 // (*Obj).ivar. 1940 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1941 ObjCInterfaceDecl *ClassDeclared; 1942 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(Context, 1943 &Member, 1944 ClassDeclared)) { 1945 // If the decl being referenced had an error, return an error for this 1946 // sub-expr without emitting another error, in order to avoid cascading 1947 // error cases. 1948 if (IV->isInvalidDecl()) 1949 return ExprError(); 1950 1951 // Check whether we can reference this field. 1952 if (DiagnoseUseOfDecl(IV, MemberLoc)) 1953 return ExprError(); 1954 if (IV->getAccessControl() != ObjCIvarDecl::Public && 1955 IV->getAccessControl() != ObjCIvarDecl::Package) { 1956 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 1957 if (ObjCMethodDecl *MD = getCurMethodDecl()) 1958 ClassOfMethodDecl = MD->getClassInterface(); 1959 else if (ObjCImpDecl && getCurFunctionDecl()) { 1960 // Case of a c-function declared inside an objc implementation. 1961 // FIXME: For a c-style function nested inside an objc implementation 1962 // class, there is no implementation context available, so we pass down 1963 // the context as argument to this routine. Ideally, this context need 1964 // be passed down in the AST node and somehow calculated from the AST 1965 // for a function decl. 1966 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 1967 if (ObjCImplementationDecl *IMPD = 1968 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 1969 ClassOfMethodDecl = IMPD->getClassInterface(); 1970 else if (ObjCCategoryImplDecl* CatImplClass = 1971 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 1972 ClassOfMethodDecl = CatImplClass->getClassInterface(); 1973 } 1974 1975 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 1976 if (ClassDeclared != IFTy->getDecl() || 1977 ClassOfMethodDecl != ClassDeclared) 1978 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 1979 } 1980 // @protected 1981 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 1982 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 1983 } 1984 1985 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 1986 MemberLoc, BaseExpr, 1987 OpKind == tok::arrow)); 1988 } 1989 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1990 << IFTy->getDecl()->getDeclName() << &Member 1991 << BaseExpr->getSourceRange()); 1992 } 1993 1994 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1995 // pointer to a (potentially qualified) interface type. 1996 const PointerType *PTy; 1997 const ObjCInterfaceType *IFTy; 1998 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1999 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 2000 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 2001 2002 // Search for a declared property first. 2003 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Context, 2004 &Member)) { 2005 // Check whether we can reference this property. 2006 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2007 return ExprError(); 2008 2009 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2010 MemberLoc, BaseExpr)); 2011 } 2012 2013 // Check protocols on qualified interfaces. 2014 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 2015 E = IFTy->qual_end(); I != E; ++I) 2016 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, 2017 &Member)) { 2018 // Check whether we can reference this property. 2019 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2020 return ExprError(); 2021 2022 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2023 MemberLoc, BaseExpr)); 2024 } 2025 2026 // If that failed, look for an "implicit" property by seeing if the nullary 2027 // selector is implemented. 2028 2029 // FIXME: The logic for looking up nullary and unary selectors should be 2030 // shared with the code in ActOnInstanceMessage. 2031 2032 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2033 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2034 2035 // If this reference is in an @implementation, check for 'private' methods. 2036 if (!Getter) 2037 Getter = FindMethodInNestedImplementations(IFace, Sel); 2038 2039 // Look through local category implementations associated with the class. 2040 if (!Getter) { 2041 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 2042 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2043 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Context, Sel); 2044 } 2045 } 2046 if (Getter) { 2047 // Check if we can reference this property. 2048 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2049 return ExprError(); 2050 } 2051 // If we found a getter then this may be a valid dot-reference, we 2052 // will look for the matching setter, in case it is needed. 2053 Selector SetterSel = 2054 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2055 PP.getSelectorTable(), &Member); 2056 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(Context, SetterSel); 2057 if (!Setter) { 2058 // If this reference is in an @implementation, also check for 'private' 2059 // methods. 2060 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2061 } 2062 // Look through local category implementations associated with the class. 2063 if (!Setter) { 2064 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2065 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2066 Setter = ObjCCategoryImpls[i]->getInstanceMethod(Context, SetterSel); 2067 } 2068 } 2069 2070 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2071 return ExprError(); 2072 2073 if (Getter || Setter) { 2074 QualType PType; 2075 2076 if (Getter) 2077 PType = Getter->getResultType(); 2078 else { 2079 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2080 E = Setter->param_end(); PI != E; ++PI) 2081 PType = (*PI)->getType(); 2082 } 2083 // FIXME: we must check that the setter has property type. 2084 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2085 Setter, MemberLoc, BaseExpr)); 2086 } 2087 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2088 << &Member << BaseType); 2089 } 2090 // Handle properties on qualified "id" protocols. 2091 const ObjCQualifiedIdType *QIdTy; 2092 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2093 // Check protocols on qualified interfaces. 2094 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2095 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2096 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2097 // Check the use of this declaration 2098 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2099 return ExprError(); 2100 2101 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2102 MemberLoc, BaseExpr)); 2103 } 2104 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2105 // Check the use of this method. 2106 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2107 return ExprError(); 2108 2109 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2110 OMD->getResultType(), 2111 OMD, OpLoc, MemberLoc, 2112 NULL, 0)); 2113 } 2114 } 2115 2116 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2117 << &Member << BaseType); 2118 } 2119 // Handle properties on ObjC 'Class' types. 2120 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2121 // Also must look for a getter name which uses property syntax. 2122 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2123 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2124 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2125 ObjCMethodDecl *Getter; 2126 // FIXME: need to also look locally in the implementation. 2127 if ((Getter = IFace->lookupClassMethod(Context, Sel))) { 2128 // Check the use of this method. 2129 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2130 return ExprError(); 2131 } 2132 // If we found a getter then this may be a valid dot-reference, we 2133 // will look for the matching setter, in case it is needed. 2134 Selector SetterSel = 2135 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2136 PP.getSelectorTable(), &Member); 2137 ObjCMethodDecl *Setter = IFace->lookupClassMethod(Context, SetterSel); 2138 if (!Setter) { 2139 // If this reference is in an @implementation, also check for 'private' 2140 // methods. 2141 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2142 } 2143 // Look through local category implementations associated with the class. 2144 if (!Setter) { 2145 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2146 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2147 Setter = ObjCCategoryImpls[i]->getClassMethod(Context, SetterSel); 2148 } 2149 } 2150 2151 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2152 return ExprError(); 2153 2154 if (Getter || Setter) { 2155 QualType PType; 2156 2157 if (Getter) 2158 PType = Getter->getResultType(); 2159 else { 2160 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2161 E = Setter->param_end(); PI != E; ++PI) 2162 PType = (*PI)->getType(); 2163 } 2164 // FIXME: we must check that the setter has property type. 2165 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2166 Setter, MemberLoc, BaseExpr)); 2167 } 2168 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2169 << &Member << BaseType); 2170 } 2171 } 2172 2173 // Handle 'field access' to vectors, such as 'V.xx'. 2174 if (BaseType->isExtVectorType()) { 2175 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2176 if (ret.isNull()) 2177 return ExprError(); 2178 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2179 MemberLoc)); 2180 } 2181 2182 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2183 << BaseType << BaseExpr->getSourceRange(); 2184 2185 // If the user is trying to apply -> or . to a function or function 2186 // pointer, it's probably because they forgot parentheses to call 2187 // the function. Suggest the addition of those parentheses. 2188 if (BaseType == Context.OverloadTy || 2189 BaseType->isFunctionType() || 2190 (BaseType->isPointerType() && 2191 BaseType->getAsPointerType()->isFunctionType())) { 2192 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2193 Diag(Loc, diag::note_member_reference_needs_call) 2194 << CodeModificationHint::CreateInsertion(Loc, "()"); 2195 } 2196 2197 return ExprError(); 2198} 2199 2200/// ConvertArgumentsForCall - Converts the arguments specified in 2201/// Args/NumArgs to the parameter types of the function FDecl with 2202/// function prototype Proto. Call is the call expression itself, and 2203/// Fn is the function expression. For a C++ member function, this 2204/// routine does not attempt to convert the object argument. Returns 2205/// true if the call is ill-formed. 2206bool 2207Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2208 FunctionDecl *FDecl, 2209 const FunctionProtoType *Proto, 2210 Expr **Args, unsigned NumArgs, 2211 SourceLocation RParenLoc) { 2212 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2213 // assignment, to the types of the corresponding parameter, ... 2214 unsigned NumArgsInProto = Proto->getNumArgs(); 2215 unsigned NumArgsToCheck = NumArgs; 2216 bool Invalid = false; 2217 2218 // If too few arguments are available (and we don't have default 2219 // arguments for the remaining parameters), don't make the call. 2220 if (NumArgs < NumArgsInProto) { 2221 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2222 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2223 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2224 // Use default arguments for missing arguments 2225 NumArgsToCheck = NumArgsInProto; 2226 Call->setNumArgs(Context, NumArgsInProto); 2227 } 2228 2229 // If too many are passed and not variadic, error on the extras and drop 2230 // them. 2231 if (NumArgs > NumArgsInProto) { 2232 if (!Proto->isVariadic()) { 2233 Diag(Args[NumArgsInProto]->getLocStart(), 2234 diag::err_typecheck_call_too_many_args) 2235 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2236 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2237 Args[NumArgs-1]->getLocEnd()); 2238 // This deletes the extra arguments. 2239 Call->setNumArgs(Context, NumArgsInProto); 2240 Invalid = true; 2241 } 2242 NumArgsToCheck = NumArgsInProto; 2243 } 2244 2245 // Continue to check argument types (even if we have too few/many args). 2246 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2247 QualType ProtoArgType = Proto->getArgType(i); 2248 2249 Expr *Arg; 2250 if (i < NumArgs) { 2251 Arg = Args[i]; 2252 2253 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2254 ProtoArgType, 2255 diag::err_call_incomplete_argument, 2256 Arg->getSourceRange())) 2257 return true; 2258 2259 // Pass the argument. 2260 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2261 return true; 2262 } else 2263 // We already type-checked the argument, so we know it works. 2264 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2265 QualType ArgType = Arg->getType(); 2266 2267 Call->setArg(i, Arg); 2268 } 2269 2270 // If this is a variadic call, handle args passed through "...". 2271 if (Proto->isVariadic()) { 2272 VariadicCallType CallType = VariadicFunction; 2273 if (Fn->getType()->isBlockPointerType()) 2274 CallType = VariadicBlock; // Block 2275 else if (isa<MemberExpr>(Fn)) 2276 CallType = VariadicMethod; 2277 2278 // Promote the arguments (C99 6.5.2.2p7). 2279 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2280 Expr *Arg = Args[i]; 2281 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2282 Call->setArg(i, Arg); 2283 } 2284 } 2285 2286 return Invalid; 2287} 2288 2289/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2290/// This provides the location of the left/right parens and a list of comma 2291/// locations. 2292Action::OwningExprResult 2293Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2294 MultiExprArg args, 2295 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2296 unsigned NumArgs = args.size(); 2297 Expr *Fn = static_cast<Expr *>(fn.release()); 2298 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2299 assert(Fn && "no function call expression"); 2300 FunctionDecl *FDecl = NULL; 2301 DeclarationName UnqualifiedName; 2302 2303 if (getLangOptions().CPlusPlus) { 2304 // Determine whether this is a dependent call inside a C++ template, 2305 // in which case we won't do any semantic analysis now. 2306 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 2307 bool Dependent = false; 2308 if (Fn->isTypeDependent()) 2309 Dependent = true; 2310 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2311 Dependent = true; 2312 2313 if (Dependent) 2314 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2315 Context.DependentTy, RParenLoc)); 2316 2317 // Determine whether this is a call to an object (C++ [over.call.object]). 2318 if (Fn->getType()->isRecordType()) 2319 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2320 CommaLocs, RParenLoc)); 2321 2322 // Determine whether this is a call to a member function. 2323 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2324 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2325 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2326 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2327 CommaLocs, RParenLoc)); 2328 } 2329 2330 // If we're directly calling a function, get the appropriate declaration. 2331 DeclRefExpr *DRExpr = NULL; 2332 Expr *FnExpr = Fn; 2333 bool ADL = true; 2334 while (true) { 2335 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2336 FnExpr = IcExpr->getSubExpr(); 2337 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2338 // Parentheses around a function disable ADL 2339 // (C++0x [basic.lookup.argdep]p1). 2340 ADL = false; 2341 FnExpr = PExpr->getSubExpr(); 2342 } else if (isa<UnaryOperator>(FnExpr) && 2343 cast<UnaryOperator>(FnExpr)->getOpcode() 2344 == UnaryOperator::AddrOf) { 2345 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2346 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2347 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2348 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2349 break; 2350 } else if (UnresolvedFunctionNameExpr *DepName 2351 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2352 UnqualifiedName = DepName->getName(); 2353 break; 2354 } else { 2355 // Any kind of name that does not refer to a declaration (or 2356 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2357 ADL = false; 2358 break; 2359 } 2360 } 2361 2362 OverloadedFunctionDecl *Ovl = 0; 2363 if (DRExpr) { 2364 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2365 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2366 } 2367 2368 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2369 // We don't perform ADL for implicit declarations of builtins. 2370 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2371 ADL = false; 2372 2373 // We don't perform ADL in C. 2374 if (!getLangOptions().CPlusPlus) 2375 ADL = false; 2376 2377 if (Ovl || ADL) { 2378 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2379 UnqualifiedName, LParenLoc, Args, 2380 NumArgs, CommaLocs, RParenLoc, ADL); 2381 if (!FDecl) 2382 return ExprError(); 2383 2384 // Update Fn to refer to the actual function selected. 2385 Expr *NewFn = 0; 2386 if (QualifiedDeclRefExpr *QDRExpr 2387 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2388 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2389 QDRExpr->getLocation(), 2390 false, false, 2391 QDRExpr->getQualifierRange(), 2392 QDRExpr->getQualifier()); 2393 else 2394 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2395 Fn->getSourceRange().getBegin()); 2396 Fn->Destroy(Context); 2397 Fn = NewFn; 2398 } 2399 } 2400 2401 // Promote the function operand. 2402 UsualUnaryConversions(Fn); 2403 2404 // Make the call expr early, before semantic checks. This guarantees cleanup 2405 // of arguments and function on error. 2406 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2407 Args, NumArgs, 2408 Context.BoolTy, 2409 RParenLoc)); 2410 2411 const FunctionType *FuncT; 2412 if (!Fn->getType()->isBlockPointerType()) { 2413 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2414 // have type pointer to function". 2415 const PointerType *PT = Fn->getType()->getAsPointerType(); 2416 if (PT == 0) 2417 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2418 << Fn->getType() << Fn->getSourceRange()); 2419 FuncT = PT->getPointeeType()->getAsFunctionType(); 2420 } else { // This is a block call. 2421 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2422 getAsFunctionType(); 2423 } 2424 if (FuncT == 0) 2425 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2426 << Fn->getType() << Fn->getSourceRange()); 2427 2428 // Check for a valid return type 2429 if (!FuncT->getResultType()->isVoidType() && 2430 RequireCompleteType(Fn->getSourceRange().getBegin(), 2431 FuncT->getResultType(), 2432 diag::err_call_incomplete_return, 2433 TheCall->getSourceRange())) 2434 return ExprError(); 2435 2436 // We know the result type of the call, set it. 2437 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2438 2439 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2440 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2441 RParenLoc)) 2442 return ExprError(); 2443 } else { 2444 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2445 2446 if (FDecl) { 2447 // Check if we have too few/too many template arguments, based 2448 // on our knowledge of the function definition. 2449 const FunctionDecl *Def = 0; 2450 if (FDecl->getBody(Context, Def) && NumArgs != Def->param_size()) 2451 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2452 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2453 } 2454 2455 // Promote the arguments (C99 6.5.2.2p6). 2456 for (unsigned i = 0; i != NumArgs; i++) { 2457 Expr *Arg = Args[i]; 2458 DefaultArgumentPromotion(Arg); 2459 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2460 Arg->getType(), 2461 diag::err_call_incomplete_argument, 2462 Arg->getSourceRange())) 2463 return ExprError(); 2464 TheCall->setArg(i, Arg); 2465 } 2466 } 2467 2468 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2469 if (!Method->isStatic()) 2470 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2471 << Fn->getSourceRange()); 2472 2473 // Do special checking on direct calls to functions. 2474 if (FDecl) 2475 return CheckFunctionCall(FDecl, TheCall.take()); 2476 2477 return Owned(TheCall.take()); 2478} 2479 2480Action::OwningExprResult 2481Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2482 SourceLocation RParenLoc, ExprArg InitExpr) { 2483 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2484 QualType literalType = QualType::getFromOpaquePtr(Ty); 2485 // FIXME: put back this assert when initializers are worked out. 2486 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2487 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2488 2489 if (literalType->isArrayType()) { 2490 if (literalType->isVariableArrayType()) 2491 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2492 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2493 } else if (RequireCompleteType(LParenLoc, literalType, 2494 diag::err_typecheck_decl_incomplete_type, 2495 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2496 return ExprError(); 2497 2498 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2499 DeclarationName(), /*FIXME:DirectInit=*/false)) 2500 return ExprError(); 2501 2502 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2503 if (isFileScope) { // 6.5.2.5p3 2504 if (CheckForConstantInitializer(literalExpr, literalType)) 2505 return ExprError(); 2506 } 2507 InitExpr.release(); 2508 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2509 literalExpr, isFileScope)); 2510} 2511 2512Action::OwningExprResult 2513Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2514 SourceLocation RBraceLoc) { 2515 unsigned NumInit = initlist.size(); 2516 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2517 2518 // Semantic analysis for initializers is done by ActOnDeclarator() and 2519 // CheckInitializer() - it requires knowledge of the object being intialized. 2520 2521 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2522 RBraceLoc); 2523 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2524 return Owned(E); 2525} 2526 2527/// CheckCastTypes - Check type constraints for casting between types. 2528bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2529 UsualUnaryConversions(castExpr); 2530 2531 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2532 // type needs to be scalar. 2533 if (castType->isVoidType()) { 2534 // Cast to void allows any expr type. 2535 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2536 // We can't check any more until template instantiation time. 2537 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2538 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2539 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2540 (castType->isStructureType() || castType->isUnionType())) { 2541 // GCC struct/union extension: allow cast to self. 2542 // FIXME: Check that the cast destination type is complete. 2543 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2544 << castType << castExpr->getSourceRange(); 2545 } else if (castType->isUnionType()) { 2546 // GCC cast to union extension 2547 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2548 RecordDecl::field_iterator Field, FieldEnd; 2549 for (Field = RD->field_begin(Context), FieldEnd = RD->field_end(Context); 2550 Field != FieldEnd; ++Field) { 2551 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2552 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2553 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2554 << castExpr->getSourceRange(); 2555 break; 2556 } 2557 } 2558 if (Field == FieldEnd) 2559 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2560 << castExpr->getType() << castExpr->getSourceRange(); 2561 } else { 2562 // Reject any other conversions to non-scalar types. 2563 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2564 << castType << castExpr->getSourceRange(); 2565 } 2566 } else if (!castExpr->getType()->isScalarType() && 2567 !castExpr->getType()->isVectorType()) { 2568 return Diag(castExpr->getLocStart(), 2569 diag::err_typecheck_expect_scalar_operand) 2570 << castExpr->getType() << castExpr->getSourceRange(); 2571 } else if (castExpr->getType()->isVectorType()) { 2572 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2573 return true; 2574 } else if (castType->isVectorType()) { 2575 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2576 return true; 2577 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2578 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2579 } 2580 return false; 2581} 2582 2583bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2584 assert(VectorTy->isVectorType() && "Not a vector type!"); 2585 2586 if (Ty->isVectorType() || Ty->isIntegerType()) { 2587 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2588 return Diag(R.getBegin(), 2589 Ty->isVectorType() ? 2590 diag::err_invalid_conversion_between_vectors : 2591 diag::err_invalid_conversion_between_vector_and_integer) 2592 << VectorTy << Ty << R; 2593 } else 2594 return Diag(R.getBegin(), 2595 diag::err_invalid_conversion_between_vector_and_scalar) 2596 << VectorTy << Ty << R; 2597 2598 return false; 2599} 2600 2601Action::OwningExprResult 2602Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2603 SourceLocation RParenLoc, ExprArg Op) { 2604 assert((Ty != 0) && (Op.get() != 0) && 2605 "ActOnCastExpr(): missing type or expr"); 2606 2607 Expr *castExpr = static_cast<Expr*>(Op.release()); 2608 QualType castType = QualType::getFromOpaquePtr(Ty); 2609 2610 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2611 return ExprError(); 2612 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2613 LParenLoc, RParenLoc)); 2614} 2615 2616/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2617/// In that case, lhs = cond. 2618/// C99 6.5.15 2619QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2620 SourceLocation QuestionLoc) { 2621 // C++ is sufficiently different to merit its own checker. 2622 if (getLangOptions().CPlusPlus) 2623 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 2624 2625 UsualUnaryConversions(Cond); 2626 UsualUnaryConversions(LHS); 2627 UsualUnaryConversions(RHS); 2628 QualType CondTy = Cond->getType(); 2629 QualType LHSTy = LHS->getType(); 2630 QualType RHSTy = RHS->getType(); 2631 2632 // first, check the condition. 2633 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2634 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2635 << CondTy; 2636 return QualType(); 2637 } 2638 2639 // Now check the two expressions. 2640 2641 // If both operands have arithmetic type, do the usual arithmetic conversions 2642 // to find a common type: C99 6.5.15p3,5. 2643 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2644 UsualArithmeticConversions(LHS, RHS); 2645 return LHS->getType(); 2646 } 2647 2648 // If both operands are the same structure or union type, the result is that 2649 // type. 2650 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2651 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2652 if (LHSRT->getDecl() == RHSRT->getDecl()) 2653 // "If both the operands have structure or union type, the result has 2654 // that type." This implies that CV qualifiers are dropped. 2655 return LHSTy.getUnqualifiedType(); 2656 // FIXME: Type of conditional expression must be complete in C mode. 2657 } 2658 2659 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2660 // The following || allows only one side to be void (a GCC-ism). 2661 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2662 if (!LHSTy->isVoidType()) 2663 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2664 << RHS->getSourceRange(); 2665 if (!RHSTy->isVoidType()) 2666 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2667 << LHS->getSourceRange(); 2668 ImpCastExprToType(LHS, Context.VoidTy); 2669 ImpCastExprToType(RHS, Context.VoidTy); 2670 return Context.VoidTy; 2671 } 2672 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2673 // the type of the other operand." 2674 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2675 Context.isObjCObjectPointerType(LHSTy)) && 2676 RHS->isNullPointerConstant(Context)) { 2677 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2678 return LHSTy; 2679 } 2680 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2681 Context.isObjCObjectPointerType(RHSTy)) && 2682 LHS->isNullPointerConstant(Context)) { 2683 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2684 return RHSTy; 2685 } 2686 2687 // Handle the case where both operands are pointers before we handle null 2688 // pointer constants in case both operands are null pointer constants. 2689 if (const PointerType *LHSPT = LHSTy->getAsPointerType()) { // C99 6.5.15p3,6 2690 if (const PointerType *RHSPT = RHSTy->getAsPointerType()) { 2691 // get the "pointed to" types 2692 QualType lhptee = LHSPT->getPointeeType(); 2693 QualType rhptee = RHSPT->getPointeeType(); 2694 2695 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2696 if (lhptee->isVoidType() && 2697 rhptee->isIncompleteOrObjectType()) { 2698 // Figure out necessary qualifiers (C99 6.5.15p6) 2699 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2700 QualType destType = Context.getPointerType(destPointee); 2701 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2702 ImpCastExprToType(RHS, destType); // promote to void* 2703 return destType; 2704 } 2705 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2706 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2707 QualType destType = Context.getPointerType(destPointee); 2708 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2709 ImpCastExprToType(RHS, destType); // promote to void* 2710 return destType; 2711 } 2712 2713 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2714 // Two identical pointer types are always compatible. 2715 return LHSTy; 2716 } 2717 2718 QualType compositeType = LHSTy; 2719 2720 // If either type is an Objective-C object type then check 2721 // compatibility according to Objective-C. 2722 if (Context.isObjCObjectPointerType(LHSTy) || 2723 Context.isObjCObjectPointerType(RHSTy)) { 2724 // If both operands are interfaces and either operand can be 2725 // assigned to the other, use that type as the composite 2726 // type. This allows 2727 // xxx ? (A*) a : (B*) b 2728 // where B is a subclass of A. 2729 // 2730 // Additionally, as for assignment, if either type is 'id' 2731 // allow silent coercion. Finally, if the types are 2732 // incompatible then make sure to use 'id' as the composite 2733 // type so the result is acceptable for sending messages to. 2734 2735 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2736 // It could return the composite type. 2737 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2738 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2739 if (LHSIface && RHSIface && 2740 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2741 compositeType = LHSTy; 2742 } else if (LHSIface && RHSIface && 2743 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2744 compositeType = RHSTy; 2745 } else if (Context.isObjCIdStructType(lhptee) || 2746 Context.isObjCIdStructType(rhptee)) { 2747 compositeType = Context.getObjCIdType(); 2748 } else { 2749 Diag(QuestionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2750 << LHSTy << RHSTy 2751 << LHS->getSourceRange() << RHS->getSourceRange(); 2752 QualType incompatTy = Context.getObjCIdType(); 2753 ImpCastExprToType(LHS, incompatTy); 2754 ImpCastExprToType(RHS, incompatTy); 2755 return incompatTy; 2756 } 2757 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2758 rhptee.getUnqualifiedType())) { 2759 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2760 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2761 // In this situation, we assume void* type. No especially good 2762 // reason, but this is what gcc does, and we do have to pick 2763 // to get a consistent AST. 2764 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2765 ImpCastExprToType(LHS, incompatTy); 2766 ImpCastExprToType(RHS, incompatTy); 2767 return incompatTy; 2768 } 2769 // The pointer types are compatible. 2770 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2771 // differently qualified versions of compatible types, the result type is 2772 // a pointer to an appropriately qualified version of the *composite* 2773 // type. 2774 // FIXME: Need to calculate the composite type. 2775 // FIXME: Need to add qualifiers 2776 ImpCastExprToType(LHS, compositeType); 2777 ImpCastExprToType(RHS, compositeType); 2778 return compositeType; 2779 } 2780 } 2781 2782 // GCC compatibility: soften pointer/integer mismatch. 2783 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 2784 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 2785 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2786 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 2787 return RHSTy; 2788 } 2789 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 2790 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 2791 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2792 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 2793 return LHSTy; 2794 } 2795 2796 // Selection between block pointer types is ok as long as they are the same. 2797 if (LHSTy->isBlockPointerType() && RHSTy->isBlockPointerType() && 2798 Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) 2799 return LHSTy; 2800 2801 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2802 // evaluates to "struct objc_object *" (and is handled above when comparing 2803 // id with statically typed objects). 2804 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 2805 // GCC allows qualified id and any Objective-C type to devolve to 2806 // id. Currently localizing to here until clear this should be 2807 // part of ObjCQualifiedIdTypesAreCompatible. 2808 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 2809 (LHSTy->isObjCQualifiedIdType() && 2810 Context.isObjCObjectPointerType(RHSTy)) || 2811 (RHSTy->isObjCQualifiedIdType() && 2812 Context.isObjCObjectPointerType(LHSTy))) { 2813 // FIXME: This is not the correct composite type. This only 2814 // happens to work because id can more or less be used anywhere, 2815 // however this may change the type of method sends. 2816 // FIXME: gcc adds some type-checking of the arguments and emits 2817 // (confusing) incompatible comparison warnings in some 2818 // cases. Investigate. 2819 QualType compositeType = Context.getObjCIdType(); 2820 ImpCastExprToType(LHS, compositeType); 2821 ImpCastExprToType(RHS, compositeType); 2822 return compositeType; 2823 } 2824 } 2825 2826 // Otherwise, the operands are not compatible. 2827 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2828 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2829 return QualType(); 2830} 2831 2832/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2833/// in the case of a the GNU conditional expr extension. 2834Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2835 SourceLocation ColonLoc, 2836 ExprArg Cond, ExprArg LHS, 2837 ExprArg RHS) { 2838 Expr *CondExpr = (Expr *) Cond.get(); 2839 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2840 2841 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2842 // was the condition. 2843 bool isLHSNull = LHSExpr == 0; 2844 if (isLHSNull) 2845 LHSExpr = CondExpr; 2846 2847 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2848 RHSExpr, QuestionLoc); 2849 if (result.isNull()) 2850 return ExprError(); 2851 2852 Cond.release(); 2853 LHS.release(); 2854 RHS.release(); 2855 return Owned(new (Context) ConditionalOperator(CondExpr, 2856 isLHSNull ? 0 : LHSExpr, 2857 RHSExpr, result)); 2858} 2859 2860 2861// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2862// being closely modeled after the C99 spec:-). The odd characteristic of this 2863// routine is it effectively iqnores the qualifiers on the top level pointee. 2864// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2865// FIXME: add a couple examples in this comment. 2866Sema::AssignConvertType 2867Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2868 QualType lhptee, rhptee; 2869 2870 // get the "pointed to" type (ignoring qualifiers at the top level) 2871 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2872 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2873 2874 // make sure we operate on the canonical type 2875 lhptee = Context.getCanonicalType(lhptee); 2876 rhptee = Context.getCanonicalType(rhptee); 2877 2878 AssignConvertType ConvTy = Compatible; 2879 2880 // C99 6.5.16.1p1: This following citation is common to constraints 2881 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2882 // qualifiers of the type *pointed to* by the right; 2883 // FIXME: Handle ExtQualType 2884 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2885 ConvTy = CompatiblePointerDiscardsQualifiers; 2886 2887 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2888 // incomplete type and the other is a pointer to a qualified or unqualified 2889 // version of void... 2890 if (lhptee->isVoidType()) { 2891 if (rhptee->isIncompleteOrObjectType()) 2892 return ConvTy; 2893 2894 // As an extension, we allow cast to/from void* to function pointer. 2895 assert(rhptee->isFunctionType()); 2896 return FunctionVoidPointer; 2897 } 2898 2899 if (rhptee->isVoidType()) { 2900 if (lhptee->isIncompleteOrObjectType()) 2901 return ConvTy; 2902 2903 // As an extension, we allow cast to/from void* to function pointer. 2904 assert(lhptee->isFunctionType()); 2905 return FunctionVoidPointer; 2906 } 2907 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2908 // unqualified versions of compatible types, ... 2909 lhptee = lhptee.getUnqualifiedType(); 2910 rhptee = rhptee.getUnqualifiedType(); 2911 if (!Context.typesAreCompatible(lhptee, rhptee)) { 2912 // Check if the pointee types are compatible ignoring the sign. 2913 // We explicitly check for char so that we catch "char" vs 2914 // "unsigned char" on systems where "char" is unsigned. 2915 if (lhptee->isCharType()) { 2916 lhptee = Context.UnsignedCharTy; 2917 } else if (lhptee->isSignedIntegerType()) { 2918 lhptee = Context.getCorrespondingUnsignedType(lhptee); 2919 } 2920 if (rhptee->isCharType()) { 2921 rhptee = Context.UnsignedCharTy; 2922 } else if (rhptee->isSignedIntegerType()) { 2923 rhptee = Context.getCorrespondingUnsignedType(rhptee); 2924 } 2925 if (lhptee == rhptee) { 2926 // Types are compatible ignoring the sign. Qualifier incompatibility 2927 // takes priority over sign incompatibility because the sign 2928 // warning can be disabled. 2929 if (ConvTy != Compatible) 2930 return ConvTy; 2931 return IncompatiblePointerSign; 2932 } 2933 // General pointer incompatibility takes priority over qualifiers. 2934 return IncompatiblePointer; 2935 } 2936 return ConvTy; 2937} 2938 2939/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2940/// block pointer types are compatible or whether a block and normal pointer 2941/// are compatible. It is more restrict than comparing two function pointer 2942// types. 2943Sema::AssignConvertType 2944Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2945 QualType rhsType) { 2946 QualType lhptee, rhptee; 2947 2948 // get the "pointed to" type (ignoring qualifiers at the top level) 2949 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2950 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2951 2952 // make sure we operate on the canonical type 2953 lhptee = Context.getCanonicalType(lhptee); 2954 rhptee = Context.getCanonicalType(rhptee); 2955 2956 AssignConvertType ConvTy = Compatible; 2957 2958 // For blocks we enforce that qualifiers are identical. 2959 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2960 ConvTy = CompatiblePointerDiscardsQualifiers; 2961 2962 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2963 return IncompatibleBlockPointer; 2964 return ConvTy; 2965} 2966 2967/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2968/// has code to accommodate several GCC extensions when type checking 2969/// pointers. Here are some objectionable examples that GCC considers warnings: 2970/// 2971/// int a, *pint; 2972/// short *pshort; 2973/// struct foo *pfoo; 2974/// 2975/// pint = pshort; // warning: assignment from incompatible pointer type 2976/// a = pint; // warning: assignment makes integer from pointer without a cast 2977/// pint = a; // warning: assignment makes pointer from integer without a cast 2978/// pint = pfoo; // warning: assignment from incompatible pointer type 2979/// 2980/// As a result, the code for dealing with pointers is more complex than the 2981/// C99 spec dictates. 2982/// 2983Sema::AssignConvertType 2984Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2985 // Get canonical types. We're not formatting these types, just comparing 2986 // them. 2987 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2988 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2989 2990 if (lhsType == rhsType) 2991 return Compatible; // Common case: fast path an exact match. 2992 2993 // If the left-hand side is a reference type, then we are in a 2994 // (rare!) case where we've allowed the use of references in C, 2995 // e.g., as a parameter type in a built-in function. In this case, 2996 // just make sure that the type referenced is compatible with the 2997 // right-hand side type. The caller is responsible for adjusting 2998 // lhsType so that the resulting expression does not have reference 2999 // type. 3000 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 3001 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3002 return Compatible; 3003 return Incompatible; 3004 } 3005 3006 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 3007 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 3008 return Compatible; 3009 // Relax integer conversions like we do for pointers below. 3010 if (rhsType->isIntegerType()) 3011 return IntToPointer; 3012 if (lhsType->isIntegerType()) 3013 return PointerToInt; 3014 return IncompatibleObjCQualifiedId; 3015 } 3016 3017 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3018 // For ExtVector, allow vector splats; float -> <n x float> 3019 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 3020 if (LV->getElementType() == rhsType) 3021 return Compatible; 3022 3023 // If we are allowing lax vector conversions, and LHS and RHS are both 3024 // vectors, the total size only needs to be the same. This is a bitcast; 3025 // no bits are changed but the result type is different. 3026 if (getLangOptions().LaxVectorConversions && 3027 lhsType->isVectorType() && rhsType->isVectorType()) { 3028 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3029 return IncompatibleVectors; 3030 } 3031 return Incompatible; 3032 } 3033 3034 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3035 return Compatible; 3036 3037 if (isa<PointerType>(lhsType)) { 3038 if (rhsType->isIntegerType()) 3039 return IntToPointer; 3040 3041 if (isa<PointerType>(rhsType)) 3042 return CheckPointerTypesForAssignment(lhsType, rhsType); 3043 3044 if (rhsType->getAsBlockPointerType()) { 3045 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3046 return Compatible; 3047 3048 // Treat block pointers as objects. 3049 if (getLangOptions().ObjC1 && 3050 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 3051 return Compatible; 3052 } 3053 return Incompatible; 3054 } 3055 3056 if (isa<BlockPointerType>(lhsType)) { 3057 if (rhsType->isIntegerType()) 3058 return IntToBlockPointer; 3059 3060 // Treat block pointers as objects. 3061 if (getLangOptions().ObjC1 && 3062 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 3063 return Compatible; 3064 3065 if (rhsType->isBlockPointerType()) 3066 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3067 3068 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3069 if (RHSPT->getPointeeType()->isVoidType()) 3070 return Compatible; 3071 } 3072 return Incompatible; 3073 } 3074 3075 if (isa<PointerType>(rhsType)) { 3076 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3077 if (lhsType == Context.BoolTy) 3078 return Compatible; 3079 3080 if (lhsType->isIntegerType()) 3081 return PointerToInt; 3082 3083 if (isa<PointerType>(lhsType)) 3084 return CheckPointerTypesForAssignment(lhsType, rhsType); 3085 3086 if (isa<BlockPointerType>(lhsType) && 3087 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3088 return Compatible; 3089 return Incompatible; 3090 } 3091 3092 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3093 if (Context.typesAreCompatible(lhsType, rhsType)) 3094 return Compatible; 3095 } 3096 return Incompatible; 3097} 3098 3099Sema::AssignConvertType 3100Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3101 if (getLangOptions().CPlusPlus) { 3102 if (!lhsType->isRecordType()) { 3103 // C++ 5.17p3: If the left operand is not of class type, the 3104 // expression is implicitly converted (C++ 4) to the 3105 // cv-unqualified type of the left operand. 3106 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3107 "assigning")) 3108 return Incompatible; 3109 return Compatible; 3110 } 3111 3112 // FIXME: Currently, we fall through and treat C++ classes like C 3113 // structures. 3114 } 3115 3116 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3117 // a null pointer constant. 3118 if ((lhsType->isPointerType() || 3119 lhsType->isObjCQualifiedIdType() || 3120 lhsType->isBlockPointerType()) 3121 && rExpr->isNullPointerConstant(Context)) { 3122 ImpCastExprToType(rExpr, lhsType); 3123 return Compatible; 3124 } 3125 3126 // This check seems unnatural, however it is necessary to ensure the proper 3127 // conversion of functions/arrays. If the conversion were done for all 3128 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3129 // expressions that surpress this implicit conversion (&, sizeof). 3130 // 3131 // Suppress this for references: C++ 8.5.3p5. 3132 if (!lhsType->isReferenceType()) 3133 DefaultFunctionArrayConversion(rExpr); 3134 3135 Sema::AssignConvertType result = 3136 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3137 3138 // C99 6.5.16.1p2: The value of the right operand is converted to the 3139 // type of the assignment expression. 3140 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3141 // so that we can use references in built-in functions even in C. 3142 // The getNonReferenceType() call makes sure that the resulting expression 3143 // does not have reference type. 3144 if (rExpr->getType() != lhsType) 3145 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3146 return result; 3147} 3148 3149Sema::AssignConvertType 3150Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 3151 return CheckAssignmentConstraints(lhsType, rhsType); 3152} 3153 3154QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3155 Diag(Loc, diag::err_typecheck_invalid_operands) 3156 << lex->getType() << rex->getType() 3157 << lex->getSourceRange() << rex->getSourceRange(); 3158 return QualType(); 3159} 3160 3161inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3162 Expr *&rex) { 3163 // For conversion purposes, we ignore any qualifiers. 3164 // For example, "const float" and "float" are equivalent. 3165 QualType lhsType = 3166 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3167 QualType rhsType = 3168 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3169 3170 // If the vector types are identical, return. 3171 if (lhsType == rhsType) 3172 return lhsType; 3173 3174 // Handle the case of a vector & extvector type of the same size and element 3175 // type. It would be nice if we only had one vector type someday. 3176 if (getLangOptions().LaxVectorConversions) { 3177 // FIXME: Should we warn here? 3178 if (const VectorType *LV = lhsType->getAsVectorType()) { 3179 if (const VectorType *RV = rhsType->getAsVectorType()) 3180 if (LV->getElementType() == RV->getElementType() && 3181 LV->getNumElements() == RV->getNumElements()) { 3182 return lhsType->isExtVectorType() ? lhsType : rhsType; 3183 } 3184 } 3185 } 3186 3187 // If the lhs is an extended vector and the rhs is a scalar of the same type 3188 // or a literal, promote the rhs to the vector type. 3189 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3190 QualType eltType = V->getElementType(); 3191 3192 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3193 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3194 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3195 ImpCastExprToType(rex, lhsType); 3196 return lhsType; 3197 } 3198 } 3199 3200 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3201 // promote the lhs to the vector type. 3202 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3203 QualType eltType = V->getElementType(); 3204 3205 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3206 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3207 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3208 ImpCastExprToType(lex, rhsType); 3209 return rhsType; 3210 } 3211 } 3212 3213 // You cannot convert between vector values of different size. 3214 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3215 << lex->getType() << rex->getType() 3216 << lex->getSourceRange() << rex->getSourceRange(); 3217 return QualType(); 3218} 3219 3220inline QualType Sema::CheckMultiplyDivideOperands( 3221 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3222{ 3223 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3224 return CheckVectorOperands(Loc, lex, rex); 3225 3226 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3227 3228 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3229 return compType; 3230 return InvalidOperands(Loc, lex, rex); 3231} 3232 3233inline QualType Sema::CheckRemainderOperands( 3234 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3235{ 3236 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3237 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3238 return CheckVectorOperands(Loc, lex, rex); 3239 return InvalidOperands(Loc, lex, rex); 3240 } 3241 3242 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3243 3244 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3245 return compType; 3246 return InvalidOperands(Loc, lex, rex); 3247} 3248 3249inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3250 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3251{ 3252 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3253 QualType compType = CheckVectorOperands(Loc, lex, rex); 3254 if (CompLHSTy) *CompLHSTy = compType; 3255 return compType; 3256 } 3257 3258 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3259 3260 // handle the common case first (both operands are arithmetic). 3261 if (lex->getType()->isArithmeticType() && 3262 rex->getType()->isArithmeticType()) { 3263 if (CompLHSTy) *CompLHSTy = compType; 3264 return compType; 3265 } 3266 3267 // Put any potential pointer into PExp 3268 Expr* PExp = lex, *IExp = rex; 3269 if (IExp->getType()->isPointerType()) 3270 std::swap(PExp, IExp); 3271 3272 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 3273 if (IExp->getType()->isIntegerType()) { 3274 // Check for arithmetic on pointers to incomplete types 3275 if (PTy->getPointeeType()->isVoidType()) { 3276 if (getLangOptions().CPlusPlus) { 3277 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3278 << lex->getSourceRange() << rex->getSourceRange(); 3279 return QualType(); 3280 } 3281 3282 // GNU extension: arithmetic on pointer to void 3283 Diag(Loc, diag::ext_gnu_void_ptr) 3284 << lex->getSourceRange() << rex->getSourceRange(); 3285 } else if (PTy->getPointeeType()->isFunctionType()) { 3286 if (getLangOptions().CPlusPlus) { 3287 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3288 << lex->getType() << lex->getSourceRange(); 3289 return QualType(); 3290 } 3291 3292 // GNU extension: arithmetic on pointer to function 3293 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3294 << lex->getType() << lex->getSourceRange(); 3295 } else if (!PTy->isDependentType() && 3296 RequireCompleteType(Loc, PTy->getPointeeType(), 3297 diag::err_typecheck_arithmetic_incomplete_type, 3298 lex->getSourceRange(), SourceRange(), 3299 lex->getType())) 3300 return QualType(); 3301 3302 if (CompLHSTy) { 3303 QualType LHSTy = lex->getType(); 3304 if (LHSTy->isPromotableIntegerType()) 3305 LHSTy = Context.IntTy; 3306 *CompLHSTy = LHSTy; 3307 } 3308 return PExp->getType(); 3309 } 3310 } 3311 3312 return InvalidOperands(Loc, lex, rex); 3313} 3314 3315// C99 6.5.6 3316QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3317 SourceLocation Loc, QualType* CompLHSTy) { 3318 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3319 QualType compType = CheckVectorOperands(Loc, lex, rex); 3320 if (CompLHSTy) *CompLHSTy = compType; 3321 return compType; 3322 } 3323 3324 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3325 3326 // Enforce type constraints: C99 6.5.6p3. 3327 3328 // Handle the common case first (both operands are arithmetic). 3329 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) { 3330 if (CompLHSTy) *CompLHSTy = compType; 3331 return compType; 3332 } 3333 3334 // Either ptr - int or ptr - ptr. 3335 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3336 QualType lpointee = LHSPTy->getPointeeType(); 3337 3338 // The LHS must be an completely-defined object type. 3339 3340 bool ComplainAboutVoid = false; 3341 Expr *ComplainAboutFunc = 0; 3342 if (lpointee->isVoidType()) { 3343 if (getLangOptions().CPlusPlus) { 3344 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3345 << lex->getSourceRange() << rex->getSourceRange(); 3346 return QualType(); 3347 } 3348 3349 // GNU C extension: arithmetic on pointer to void 3350 ComplainAboutVoid = true; 3351 } else if (lpointee->isFunctionType()) { 3352 if (getLangOptions().CPlusPlus) { 3353 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3354 << lex->getType() << lex->getSourceRange(); 3355 return QualType(); 3356 } 3357 3358 // GNU C extension: arithmetic on pointer to function 3359 ComplainAboutFunc = lex; 3360 } else if (!lpointee->isDependentType() && 3361 RequireCompleteType(Loc, lpointee, 3362 diag::err_typecheck_sub_ptr_object, 3363 lex->getSourceRange(), 3364 SourceRange(), 3365 lex->getType())) 3366 return QualType(); 3367 3368 // The result type of a pointer-int computation is the pointer type. 3369 if (rex->getType()->isIntegerType()) { 3370 if (ComplainAboutVoid) 3371 Diag(Loc, diag::ext_gnu_void_ptr) 3372 << lex->getSourceRange() << rex->getSourceRange(); 3373 if (ComplainAboutFunc) 3374 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3375 << ComplainAboutFunc->getType() 3376 << ComplainAboutFunc->getSourceRange(); 3377 3378 if (CompLHSTy) *CompLHSTy = lex->getType(); 3379 return lex->getType(); 3380 } 3381 3382 // Handle pointer-pointer subtractions. 3383 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3384 QualType rpointee = RHSPTy->getPointeeType(); 3385 3386 // RHS must be a completely-type object type. 3387 // Handle the GNU void* extension. 3388 if (rpointee->isVoidType()) { 3389 if (getLangOptions().CPlusPlus) { 3390 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3391 << lex->getSourceRange() << rex->getSourceRange(); 3392 return QualType(); 3393 } 3394 3395 ComplainAboutVoid = true; 3396 } else if (rpointee->isFunctionType()) { 3397 if (getLangOptions().CPlusPlus) { 3398 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3399 << rex->getType() << rex->getSourceRange(); 3400 return QualType(); 3401 } 3402 3403 // GNU extension: arithmetic on pointer to function 3404 if (!ComplainAboutFunc) 3405 ComplainAboutFunc = rex; 3406 } else if (!rpointee->isDependentType() && 3407 RequireCompleteType(Loc, rpointee, 3408 diag::err_typecheck_sub_ptr_object, 3409 rex->getSourceRange(), 3410 SourceRange(), 3411 rex->getType())) 3412 return QualType(); 3413 3414 // Pointee types must be compatible. 3415 if (!Context.typesAreCompatible( 3416 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3417 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3418 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3419 << lex->getType() << rex->getType() 3420 << lex->getSourceRange() << rex->getSourceRange(); 3421 return QualType(); 3422 } 3423 3424 if (ComplainAboutVoid) 3425 Diag(Loc, diag::ext_gnu_void_ptr) 3426 << lex->getSourceRange() << rex->getSourceRange(); 3427 if (ComplainAboutFunc) 3428 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3429 << ComplainAboutFunc->getType() 3430 << ComplainAboutFunc->getSourceRange(); 3431 3432 if (CompLHSTy) *CompLHSTy = lex->getType(); 3433 return Context.getPointerDiffType(); 3434 } 3435 } 3436 3437 return InvalidOperands(Loc, lex, rex); 3438} 3439 3440// C99 6.5.7 3441QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3442 bool isCompAssign) { 3443 // C99 6.5.7p2: Each of the operands shall have integer type. 3444 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3445 return InvalidOperands(Loc, lex, rex); 3446 3447 // Shifts don't perform usual arithmetic conversions, they just do integer 3448 // promotions on each operand. C99 6.5.7p3 3449 QualType LHSTy; 3450 if (lex->getType()->isPromotableIntegerType()) 3451 LHSTy = Context.IntTy; 3452 else 3453 LHSTy = lex->getType(); 3454 if (!isCompAssign) 3455 ImpCastExprToType(lex, LHSTy); 3456 3457 UsualUnaryConversions(rex); 3458 3459 // "The type of the result is that of the promoted left operand." 3460 return LHSTy; 3461} 3462 3463// C99 6.5.8 3464QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3465 unsigned OpaqueOpc, bool isRelational) { 3466 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 3467 3468 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3469 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3470 3471 // C99 6.5.8p3 / C99 6.5.9p4 3472 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3473 UsualArithmeticConversions(lex, rex); 3474 else { 3475 UsualUnaryConversions(lex); 3476 UsualUnaryConversions(rex); 3477 } 3478 QualType lType = lex->getType(); 3479 QualType rType = rex->getType(); 3480 3481 if (!lType->isFloatingType()) { 3482 // For non-floating point types, check for self-comparisons of the form 3483 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3484 // often indicate logic errors in the program. 3485 // NOTE: Don't warn about comparisons of enum constants. These can arise 3486 // from macro expansions, and are usually quite deliberate. 3487 Expr *LHSStripped = lex->IgnoreParens(); 3488 Expr *RHSStripped = rex->IgnoreParens(); 3489 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3490 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3491 if (DRL->getDecl() == DRR->getDecl() && 3492 !isa<EnumConstantDecl>(DRL->getDecl())) 3493 Diag(Loc, diag::warn_selfcomparison); 3494 3495 if (isa<CastExpr>(LHSStripped)) 3496 LHSStripped = LHSStripped->IgnoreParenCasts(); 3497 if (isa<CastExpr>(RHSStripped)) 3498 RHSStripped = RHSStripped->IgnoreParenCasts(); 3499 3500 // Warn about comparisons against a string constant (unless the other 3501 // operand is null), the user probably wants strcmp. 3502 Expr *literalString = 0; 3503 Expr *literalStringStripped = 0; 3504 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3505 !RHSStripped->isNullPointerConstant(Context)) { 3506 literalString = lex; 3507 literalStringStripped = LHSStripped; 3508 } 3509 else if ((isa<StringLiteral>(RHSStripped) || 3510 isa<ObjCEncodeExpr>(RHSStripped)) && 3511 !LHSStripped->isNullPointerConstant(Context)) { 3512 literalString = rex; 3513 literalStringStripped = RHSStripped; 3514 } 3515 3516 if (literalString) { 3517 std::string resultComparison; 3518 switch (Opc) { 3519 case BinaryOperator::LT: resultComparison = ") < 0"; break; 3520 case BinaryOperator::GT: resultComparison = ") > 0"; break; 3521 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 3522 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 3523 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 3524 case BinaryOperator::NE: resultComparison = ") != 0"; break; 3525 default: assert(false && "Invalid comparison operator"); 3526 } 3527 Diag(Loc, diag::warn_stringcompare) 3528 << isa<ObjCEncodeExpr>(literalStringStripped) 3529 << literalString->getSourceRange() 3530 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 3531 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 3532 "strcmp(") 3533 << CodeModificationHint::CreateInsertion( 3534 PP.getLocForEndOfToken(rex->getLocEnd()), 3535 resultComparison); 3536 } 3537 } 3538 3539 // The result of comparisons is 'bool' in C++, 'int' in C. 3540 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3541 3542 if (isRelational) { 3543 if (lType->isRealType() && rType->isRealType()) 3544 return ResultTy; 3545 } else { 3546 // Check for comparisons of floating point operands using != and ==. 3547 if (lType->isFloatingType()) { 3548 assert(rType->isFloatingType()); 3549 CheckFloatComparison(Loc,lex,rex); 3550 } 3551 3552 if (lType->isArithmeticType() && rType->isArithmeticType()) 3553 return ResultTy; 3554 } 3555 3556 bool LHSIsNull = lex->isNullPointerConstant(Context); 3557 bool RHSIsNull = rex->isNullPointerConstant(Context); 3558 3559 // All of the following pointer related warnings are GCC extensions, except 3560 // when handling null pointer constants. One day, we can consider making them 3561 // errors (when -pedantic-errors is enabled). 3562 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3563 QualType LCanPointeeTy = 3564 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3565 QualType RCanPointeeTy = 3566 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3567 3568 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3569 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3570 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3571 RCanPointeeTy.getUnqualifiedType()) && 3572 !Context.areComparableObjCPointerTypes(lType, rType)) { 3573 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3574 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3575 } 3576 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3577 return ResultTy; 3578 } 3579 // Handle block pointer types. 3580 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 3581 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3582 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3583 3584 if (!LHSIsNull && !RHSIsNull && 3585 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3586 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3587 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3588 } 3589 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3590 return ResultTy; 3591 } 3592 // Allow block pointers to be compared with null pointer constants. 3593 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3594 (lType->isPointerType() && rType->isBlockPointerType())) { 3595 if (!LHSIsNull && !RHSIsNull) { 3596 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3597 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3598 } 3599 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3600 return ResultTy; 3601 } 3602 3603 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3604 if (lType->isPointerType() || rType->isPointerType()) { 3605 const PointerType *LPT = lType->getAsPointerType(); 3606 const PointerType *RPT = rType->getAsPointerType(); 3607 bool LPtrToVoid = LPT ? 3608 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3609 bool RPtrToVoid = RPT ? 3610 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3611 3612 if (!LPtrToVoid && !RPtrToVoid && 3613 !Context.typesAreCompatible(lType, rType)) { 3614 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3615 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3616 ImpCastExprToType(rex, lType); 3617 return ResultTy; 3618 } 3619 ImpCastExprToType(rex, lType); 3620 return ResultTy; 3621 } 3622 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3623 ImpCastExprToType(rex, lType); 3624 return ResultTy; 3625 } else { 3626 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3627 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3628 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3629 ImpCastExprToType(rex, lType); 3630 return ResultTy; 3631 } 3632 } 3633 } 3634 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3635 rType->isIntegerType()) { 3636 if (!RHSIsNull) 3637 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3638 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3639 ImpCastExprToType(rex, lType); // promote the integer to pointer 3640 return ResultTy; 3641 } 3642 if (lType->isIntegerType() && 3643 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3644 if (!LHSIsNull) 3645 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3646 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3647 ImpCastExprToType(lex, rType); // promote the integer to pointer 3648 return ResultTy; 3649 } 3650 // Handle block pointers. 3651 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3652 if (!RHSIsNull) 3653 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3654 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3655 ImpCastExprToType(rex, lType); // promote the integer to pointer 3656 return ResultTy; 3657 } 3658 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3659 if (!LHSIsNull) 3660 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3661 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3662 ImpCastExprToType(lex, rType); // promote the integer to pointer 3663 return ResultTy; 3664 } 3665 return InvalidOperands(Loc, lex, rex); 3666} 3667 3668/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3669/// operates on extended vector types. Instead of producing an IntTy result, 3670/// like a scalar comparison, a vector comparison produces a vector of integer 3671/// types. 3672QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3673 SourceLocation Loc, 3674 bool isRelational) { 3675 // Check to make sure we're operating on vectors of the same type and width, 3676 // Allowing one side to be a scalar of element type. 3677 QualType vType = CheckVectorOperands(Loc, lex, rex); 3678 if (vType.isNull()) 3679 return vType; 3680 3681 QualType lType = lex->getType(); 3682 QualType rType = rex->getType(); 3683 3684 // For non-floating point types, check for self-comparisons of the form 3685 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3686 // often indicate logic errors in the program. 3687 if (!lType->isFloatingType()) { 3688 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3689 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3690 if (DRL->getDecl() == DRR->getDecl()) 3691 Diag(Loc, diag::warn_selfcomparison); 3692 } 3693 3694 // Check for comparisons of floating point operands using != and ==. 3695 if (!isRelational && lType->isFloatingType()) { 3696 assert (rType->isFloatingType()); 3697 CheckFloatComparison(Loc,lex,rex); 3698 } 3699 3700 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 3701 // just reject all vector comparisons for now. 3702 if (1) { 3703 Diag(Loc, diag::err_typecheck_vector_comparison) 3704 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3705 return QualType(); 3706 } 3707 3708 // Return the type for the comparison, which is the same as vector type for 3709 // integer vectors, or an integer type of identical size and number of 3710 // elements for floating point vectors. 3711 if (lType->isIntegerType()) 3712 return lType; 3713 3714 const VectorType *VTy = lType->getAsVectorType(); 3715 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3716 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3717 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3718 if (TypeSize == Context.getTypeSize(Context.LongTy)) 3719 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3720 3721 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3722 "Unhandled vector element size in vector compare"); 3723 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3724} 3725 3726inline QualType Sema::CheckBitwiseOperands( 3727 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3728{ 3729 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3730 return CheckVectorOperands(Loc, lex, rex); 3731 3732 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3733 3734 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3735 return compType; 3736 return InvalidOperands(Loc, lex, rex); 3737} 3738 3739inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3740 Expr *&lex, Expr *&rex, SourceLocation Loc) 3741{ 3742 UsualUnaryConversions(lex); 3743 UsualUnaryConversions(rex); 3744 3745 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3746 return Context.IntTy; 3747 return InvalidOperands(Loc, lex, rex); 3748} 3749 3750/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3751/// is a read-only property; return true if so. A readonly property expression 3752/// depends on various declarations and thus must be treated specially. 3753/// 3754static bool IsReadonlyProperty(Expr *E, Sema &S) 3755{ 3756 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3757 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3758 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3759 QualType BaseType = PropExpr->getBase()->getType(); 3760 if (const PointerType *PTy = BaseType->getAsPointerType()) 3761 if (const ObjCInterfaceType *IFTy = 3762 PTy->getPointeeType()->getAsObjCInterfaceType()) 3763 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3764 if (S.isPropertyReadonly(PDecl, IFace)) 3765 return true; 3766 } 3767 } 3768 return false; 3769} 3770 3771/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3772/// emit an error and return true. If so, return false. 3773static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3774 SourceLocation OrigLoc = Loc; 3775 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 3776 &Loc); 3777 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3778 IsLV = Expr::MLV_ReadonlyProperty; 3779 if (IsLV == Expr::MLV_Valid) 3780 return false; 3781 3782 unsigned Diag = 0; 3783 bool NeedType = false; 3784 switch (IsLV) { // C99 6.5.16p2 3785 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3786 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3787 case Expr::MLV_ArrayType: 3788 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3789 NeedType = true; 3790 break; 3791 case Expr::MLV_NotObjectType: 3792 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3793 NeedType = true; 3794 break; 3795 case Expr::MLV_LValueCast: 3796 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3797 break; 3798 case Expr::MLV_InvalidExpression: 3799 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3800 break; 3801 case Expr::MLV_IncompleteType: 3802 case Expr::MLV_IncompleteVoidType: 3803 return S.RequireCompleteType(Loc, E->getType(), 3804 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3805 E->getSourceRange()); 3806 case Expr::MLV_DuplicateVectorComponents: 3807 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 3808 break; 3809 case Expr::MLV_NotBlockQualified: 3810 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 3811 break; 3812 case Expr::MLV_ReadonlyProperty: 3813 Diag = diag::error_readonly_property_assignment; 3814 break; 3815 case Expr::MLV_NoSetterProperty: 3816 Diag = diag::error_nosetter_property_assignment; 3817 break; 3818 } 3819 3820 SourceRange Assign; 3821 if (Loc != OrigLoc) 3822 Assign = SourceRange(OrigLoc, OrigLoc); 3823 if (NeedType) 3824 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 3825 else 3826 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 3827 return true; 3828} 3829 3830 3831 3832// C99 6.5.16.1 3833QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 3834 SourceLocation Loc, 3835 QualType CompoundType) { 3836 // Verify that LHS is a modifiable lvalue, and emit error if not. 3837 if (CheckForModifiableLvalue(LHS, Loc, *this)) 3838 return QualType(); 3839 3840 QualType LHSType = LHS->getType(); 3841 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 3842 3843 AssignConvertType ConvTy; 3844 if (CompoundType.isNull()) { 3845 // Simple assignment "x = y". 3846 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 3847 // Special case of NSObject attributes on c-style pointer types. 3848 if (ConvTy == IncompatiblePointer && 3849 ((Context.isObjCNSObjectType(LHSType) && 3850 Context.isObjCObjectPointerType(RHSType)) || 3851 (Context.isObjCNSObjectType(RHSType) && 3852 Context.isObjCObjectPointerType(LHSType)))) 3853 ConvTy = Compatible; 3854 3855 // If the RHS is a unary plus or minus, check to see if they = and + are 3856 // right next to each other. If so, the user may have typo'd "x =+ 4" 3857 // instead of "x += 4". 3858 Expr *RHSCheck = RHS; 3859 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 3860 RHSCheck = ICE->getSubExpr(); 3861 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 3862 if ((UO->getOpcode() == UnaryOperator::Plus || 3863 UO->getOpcode() == UnaryOperator::Minus) && 3864 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 3865 // Only if the two operators are exactly adjacent. 3866 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 3867 // And there is a space or other character before the subexpr of the 3868 // unary +/-. We don't want to warn on "x=-1". 3869 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 3870 UO->getSubExpr()->getLocStart().isFileID()) { 3871 Diag(Loc, diag::warn_not_compound_assign) 3872 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 3873 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 3874 } 3875 } 3876 } else { 3877 // Compound assignment "x += y" 3878 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 3879 } 3880 3881 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 3882 RHS, "assigning")) 3883 return QualType(); 3884 3885 // C99 6.5.16p3: The type of an assignment expression is the type of the 3886 // left operand unless the left operand has qualified type, in which case 3887 // it is the unqualified version of the type of the left operand. 3888 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 3889 // is converted to the type of the assignment expression (above). 3890 // C++ 5.17p1: the type of the assignment expression is that of its left 3891 // oprdu. 3892 return LHSType.getUnqualifiedType(); 3893} 3894 3895// C99 6.5.17 3896QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 3897 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 3898 DefaultFunctionArrayConversion(RHS); 3899 3900 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 3901 // incomplete in C++). 3902 3903 return RHS->getType(); 3904} 3905 3906/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 3907/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 3908QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 3909 bool isInc) { 3910 if (Op->isTypeDependent()) 3911 return Context.DependentTy; 3912 3913 QualType ResType = Op->getType(); 3914 assert(!ResType.isNull() && "no type for increment/decrement expression"); 3915 3916 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 3917 // Decrement of bool is not allowed. 3918 if (!isInc) { 3919 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 3920 return QualType(); 3921 } 3922 // Increment of bool sets it to true, but is deprecated. 3923 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 3924 } else if (ResType->isRealType()) { 3925 // OK! 3926 } else if (const PointerType *PT = ResType->getAsPointerType()) { 3927 // C99 6.5.2.4p2, 6.5.6p2 3928 if (PT->getPointeeType()->isVoidType()) { 3929 if (getLangOptions().CPlusPlus) { 3930 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 3931 << Op->getSourceRange(); 3932 return QualType(); 3933 } 3934 3935 // Pointer to void is a GNU extension in C. 3936 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 3937 } else if (PT->getPointeeType()->isFunctionType()) { 3938 if (getLangOptions().CPlusPlus) { 3939 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 3940 << Op->getType() << Op->getSourceRange(); 3941 return QualType(); 3942 } 3943 3944 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 3945 << ResType << Op->getSourceRange(); 3946 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 3947 diag::err_typecheck_arithmetic_incomplete_type, 3948 Op->getSourceRange(), SourceRange(), 3949 ResType)) 3950 return QualType(); 3951 } else if (ResType->isComplexType()) { 3952 // C99 does not support ++/-- on complex types, we allow as an extension. 3953 Diag(OpLoc, diag::ext_integer_increment_complex) 3954 << ResType << Op->getSourceRange(); 3955 } else { 3956 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 3957 << ResType << Op->getSourceRange(); 3958 return QualType(); 3959 } 3960 // At this point, we know we have a real, complex or pointer type. 3961 // Now make sure the operand is a modifiable lvalue. 3962 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 3963 return QualType(); 3964 return ResType; 3965} 3966 3967/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 3968/// This routine allows us to typecheck complex/recursive expressions 3969/// where the declaration is needed for type checking. We only need to 3970/// handle cases when the expression references a function designator 3971/// or is an lvalue. Here are some examples: 3972/// - &(x) => x 3973/// - &*****f => f for f a function designator. 3974/// - &s.xx => s 3975/// - &s.zz[1].yy -> s, if zz is an array 3976/// - *(x + 1) -> x, if x is an array 3977/// - &"123"[2] -> 0 3978/// - & __real__ x -> x 3979static NamedDecl *getPrimaryDecl(Expr *E) { 3980 switch (E->getStmtClass()) { 3981 case Stmt::DeclRefExprClass: 3982 case Stmt::QualifiedDeclRefExprClass: 3983 return cast<DeclRefExpr>(E)->getDecl(); 3984 case Stmt::MemberExprClass: 3985 // If this is an arrow operator, the address is an offset from 3986 // the base's value, so the object the base refers to is 3987 // irrelevant. 3988 if (cast<MemberExpr>(E)->isArrow()) 3989 return 0; 3990 // Otherwise, the expression refers to a part of the base 3991 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 3992 case Stmt::ArraySubscriptExprClass: { 3993 // FIXME: This code shouldn't be necessary! We should catch the 3994 // implicit promotion of register arrays earlier. 3995 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 3996 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 3997 if (ICE->getSubExpr()->getType()->isArrayType()) 3998 return getPrimaryDecl(ICE->getSubExpr()); 3999 } 4000 return 0; 4001 } 4002 case Stmt::UnaryOperatorClass: { 4003 UnaryOperator *UO = cast<UnaryOperator>(E); 4004 4005 switch(UO->getOpcode()) { 4006 case UnaryOperator::Real: 4007 case UnaryOperator::Imag: 4008 case UnaryOperator::Extension: 4009 return getPrimaryDecl(UO->getSubExpr()); 4010 default: 4011 return 0; 4012 } 4013 } 4014 case Stmt::ParenExprClass: 4015 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4016 case Stmt::ImplicitCastExprClass: 4017 // If the result of an implicit cast is an l-value, we care about 4018 // the sub-expression; otherwise, the result here doesn't matter. 4019 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4020 default: 4021 return 0; 4022 } 4023} 4024 4025/// CheckAddressOfOperand - The operand of & must be either a function 4026/// designator or an lvalue designating an object. If it is an lvalue, the 4027/// object cannot be declared with storage class register or be a bit field. 4028/// Note: The usual conversions are *not* applied to the operand of the & 4029/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4030/// In C++, the operand might be an overloaded function name, in which case 4031/// we allow the '&' but retain the overloaded-function type. 4032QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4033 // Make sure to ignore parentheses in subsequent checks 4034 op = op->IgnoreParens(); 4035 4036 if (op->isTypeDependent()) 4037 return Context.DependentTy; 4038 4039 if (getLangOptions().C99) { 4040 // Implement C99-only parts of addressof rules. 4041 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4042 if (uOp->getOpcode() == UnaryOperator::Deref) 4043 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4044 // (assuming the deref expression is valid). 4045 return uOp->getSubExpr()->getType(); 4046 } 4047 // Technically, there should be a check for array subscript 4048 // expressions here, but the result of one is always an lvalue anyway. 4049 } 4050 NamedDecl *dcl = getPrimaryDecl(op); 4051 Expr::isLvalueResult lval = op->isLvalue(Context); 4052 4053 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 4054 // The operand must be either an l-value or a function designator 4055 if (!dcl || !isa<FunctionDecl>(dcl)) { 4056 // FIXME: emit more specific diag... 4057 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4058 << op->getSourceRange(); 4059 return QualType(); 4060 } 4061 } else if (op->isBitField()) { // C99 6.5.3.2p1 4062 // The operand cannot be a bit-field 4063 Diag(OpLoc, diag::err_typecheck_address_of) 4064 << "bit-field" << op->getSourceRange(); 4065 return QualType(); 4066 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4067 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4068 // The operand cannot be an element of a vector 4069 Diag(OpLoc, diag::err_typecheck_address_of) 4070 << "vector element" << op->getSourceRange(); 4071 return QualType(); 4072 } else if (dcl) { // C99 6.5.3.2p1 4073 // We have an lvalue with a decl. Make sure the decl is not declared 4074 // with the register storage-class specifier. 4075 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4076 if (vd->getStorageClass() == VarDecl::Register) { 4077 Diag(OpLoc, diag::err_typecheck_address_of) 4078 << "register variable" << op->getSourceRange(); 4079 return QualType(); 4080 } 4081 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4082 return Context.OverloadTy; 4083 } else if (isa<FieldDecl>(dcl)) { 4084 // Okay: we can take the address of a field. 4085 // Could be a pointer to member, though, if there is an explicit 4086 // scope qualifier for the class. 4087 if (isa<QualifiedDeclRefExpr>(op)) { 4088 DeclContext *Ctx = dcl->getDeclContext(); 4089 if (Ctx && Ctx->isRecord()) 4090 return Context.getMemberPointerType(op->getType(), 4091 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4092 } 4093 } else if (isa<FunctionDecl>(dcl)) { 4094 // Okay: we can take the address of a function. 4095 // As above. 4096 if (isa<QualifiedDeclRefExpr>(op)) { 4097 DeclContext *Ctx = dcl->getDeclContext(); 4098 if (Ctx && Ctx->isRecord()) 4099 return Context.getMemberPointerType(op->getType(), 4100 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4101 } 4102 } 4103 else 4104 assert(0 && "Unknown/unexpected decl type"); 4105 } 4106 4107 // If the operand has type "type", the result has type "pointer to type". 4108 return Context.getPointerType(op->getType()); 4109} 4110 4111QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4112 if (Op->isTypeDependent()) 4113 return Context.DependentTy; 4114 4115 UsualUnaryConversions(Op); 4116 QualType Ty = Op->getType(); 4117 4118 // Note that per both C89 and C99, this is always legal, even if ptype is an 4119 // incomplete type or void. It would be possible to warn about dereferencing 4120 // a void pointer, but it's completely well-defined, and such a warning is 4121 // unlikely to catch any mistakes. 4122 if (const PointerType *PT = Ty->getAsPointerType()) 4123 return PT->getPointeeType(); 4124 4125 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4126 << Ty << Op->getSourceRange(); 4127 return QualType(); 4128} 4129 4130static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4131 tok::TokenKind Kind) { 4132 BinaryOperator::Opcode Opc; 4133 switch (Kind) { 4134 default: assert(0 && "Unknown binop!"); 4135 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4136 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4137 case tok::star: Opc = BinaryOperator::Mul; break; 4138 case tok::slash: Opc = BinaryOperator::Div; break; 4139 case tok::percent: Opc = BinaryOperator::Rem; break; 4140 case tok::plus: Opc = BinaryOperator::Add; break; 4141 case tok::minus: Opc = BinaryOperator::Sub; break; 4142 case tok::lessless: Opc = BinaryOperator::Shl; break; 4143 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4144 case tok::lessequal: Opc = BinaryOperator::LE; break; 4145 case tok::less: Opc = BinaryOperator::LT; break; 4146 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4147 case tok::greater: Opc = BinaryOperator::GT; break; 4148 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4149 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4150 case tok::amp: Opc = BinaryOperator::And; break; 4151 case tok::caret: Opc = BinaryOperator::Xor; break; 4152 case tok::pipe: Opc = BinaryOperator::Or; break; 4153 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4154 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4155 case tok::equal: Opc = BinaryOperator::Assign; break; 4156 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4157 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4158 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4159 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4160 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4161 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4162 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4163 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4164 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4165 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4166 case tok::comma: Opc = BinaryOperator::Comma; break; 4167 } 4168 return Opc; 4169} 4170 4171static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4172 tok::TokenKind Kind) { 4173 UnaryOperator::Opcode Opc; 4174 switch (Kind) { 4175 default: assert(0 && "Unknown unary op!"); 4176 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4177 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4178 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4179 case tok::star: Opc = UnaryOperator::Deref; break; 4180 case tok::plus: Opc = UnaryOperator::Plus; break; 4181 case tok::minus: Opc = UnaryOperator::Minus; break; 4182 case tok::tilde: Opc = UnaryOperator::Not; break; 4183 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4184 case tok::kw___real: Opc = UnaryOperator::Real; break; 4185 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4186 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4187 } 4188 return Opc; 4189} 4190 4191/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4192/// operator @p Opc at location @c TokLoc. This routine only supports 4193/// built-in operations; ActOnBinOp handles overloaded operators. 4194Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4195 unsigned Op, 4196 Expr *lhs, Expr *rhs) { 4197 QualType ResultTy; // Result type of the binary operator. 4198 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4199 // The following two variables are used for compound assignment operators 4200 QualType CompLHSTy; // Type of LHS after promotions for computation 4201 QualType CompResultTy; // Type of computation result 4202 4203 switch (Opc) { 4204 case BinaryOperator::Assign: 4205 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4206 break; 4207 case BinaryOperator::PtrMemD: 4208 case BinaryOperator::PtrMemI: 4209 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4210 Opc == BinaryOperator::PtrMemI); 4211 break; 4212 case BinaryOperator::Mul: 4213 case BinaryOperator::Div: 4214 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4215 break; 4216 case BinaryOperator::Rem: 4217 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4218 break; 4219 case BinaryOperator::Add: 4220 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4221 break; 4222 case BinaryOperator::Sub: 4223 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4224 break; 4225 case BinaryOperator::Shl: 4226 case BinaryOperator::Shr: 4227 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4228 break; 4229 case BinaryOperator::LE: 4230 case BinaryOperator::LT: 4231 case BinaryOperator::GE: 4232 case BinaryOperator::GT: 4233 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4234 break; 4235 case BinaryOperator::EQ: 4236 case BinaryOperator::NE: 4237 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4238 break; 4239 case BinaryOperator::And: 4240 case BinaryOperator::Xor: 4241 case BinaryOperator::Or: 4242 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4243 break; 4244 case BinaryOperator::LAnd: 4245 case BinaryOperator::LOr: 4246 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4247 break; 4248 case BinaryOperator::MulAssign: 4249 case BinaryOperator::DivAssign: 4250 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4251 CompLHSTy = CompResultTy; 4252 if (!CompResultTy.isNull()) 4253 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4254 break; 4255 case BinaryOperator::RemAssign: 4256 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4257 CompLHSTy = CompResultTy; 4258 if (!CompResultTy.isNull()) 4259 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4260 break; 4261 case BinaryOperator::AddAssign: 4262 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4263 if (!CompResultTy.isNull()) 4264 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4265 break; 4266 case BinaryOperator::SubAssign: 4267 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4268 if (!CompResultTy.isNull()) 4269 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4270 break; 4271 case BinaryOperator::ShlAssign: 4272 case BinaryOperator::ShrAssign: 4273 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4274 CompLHSTy = CompResultTy; 4275 if (!CompResultTy.isNull()) 4276 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4277 break; 4278 case BinaryOperator::AndAssign: 4279 case BinaryOperator::XorAssign: 4280 case BinaryOperator::OrAssign: 4281 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4282 CompLHSTy = CompResultTy; 4283 if (!CompResultTy.isNull()) 4284 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4285 break; 4286 case BinaryOperator::Comma: 4287 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4288 break; 4289 } 4290 if (ResultTy.isNull()) 4291 return ExprError(); 4292 if (CompResultTy.isNull()) 4293 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4294 else 4295 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4296 CompLHSTy, CompResultTy, 4297 OpLoc)); 4298} 4299 4300// Binary Operators. 'Tok' is the token for the operator. 4301Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4302 tok::TokenKind Kind, 4303 ExprArg LHS, ExprArg RHS) { 4304 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4305 Expr *lhs = (Expr *)LHS.release(), *rhs = (Expr*)RHS.release(); 4306 4307 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4308 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4309 4310 if (getLangOptions().CPlusPlus && 4311 (lhs->getType()->isOverloadableType() || 4312 rhs->getType()->isOverloadableType())) { 4313 // Find all of the overloaded operators visible from this 4314 // point. We perform both an operator-name lookup from the local 4315 // scope and an argument-dependent lookup based on the types of 4316 // the arguments. 4317 FunctionSet Functions; 4318 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4319 if (OverOp != OO_None) { 4320 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4321 Functions); 4322 Expr *Args[2] = { lhs, rhs }; 4323 DeclarationName OpName 4324 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4325 ArgumentDependentLookup(OpName, Args, 2, Functions); 4326 } 4327 4328 // Build the (potentially-overloaded, potentially-dependent) 4329 // binary operation. 4330 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4331 } 4332 4333 // Build a built-in binary operation. 4334 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4335} 4336 4337Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4338 unsigned OpcIn, 4339 ExprArg InputArg) { 4340 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4341 4342 // FIXME: Input is modified below, but InputArg is not updated 4343 // appropriately. 4344 Expr *Input = (Expr *)InputArg.get(); 4345 QualType resultType; 4346 switch (Opc) { 4347 case UnaryOperator::PostInc: 4348 case UnaryOperator::PostDec: 4349 case UnaryOperator::OffsetOf: 4350 assert(false && "Invalid unary operator"); 4351 break; 4352 4353 case UnaryOperator::PreInc: 4354 case UnaryOperator::PreDec: 4355 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4356 Opc == UnaryOperator::PreInc); 4357 break; 4358 case UnaryOperator::AddrOf: 4359 resultType = CheckAddressOfOperand(Input, OpLoc); 4360 break; 4361 case UnaryOperator::Deref: 4362 DefaultFunctionArrayConversion(Input); 4363 resultType = CheckIndirectionOperand(Input, OpLoc); 4364 break; 4365 case UnaryOperator::Plus: 4366 case UnaryOperator::Minus: 4367 UsualUnaryConversions(Input); 4368 resultType = Input->getType(); 4369 if (resultType->isDependentType()) 4370 break; 4371 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4372 break; 4373 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4374 resultType->isEnumeralType()) 4375 break; 4376 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4377 Opc == UnaryOperator::Plus && 4378 resultType->isPointerType()) 4379 break; 4380 4381 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4382 << resultType << Input->getSourceRange()); 4383 case UnaryOperator::Not: // bitwise complement 4384 UsualUnaryConversions(Input); 4385 resultType = Input->getType(); 4386 if (resultType->isDependentType()) 4387 break; 4388 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4389 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4390 // C99 does not support '~' for complex conjugation. 4391 Diag(OpLoc, diag::ext_integer_complement_complex) 4392 << resultType << Input->getSourceRange(); 4393 else if (!resultType->isIntegerType()) 4394 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4395 << resultType << Input->getSourceRange()); 4396 break; 4397 case UnaryOperator::LNot: // logical negation 4398 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4399 DefaultFunctionArrayConversion(Input); 4400 resultType = Input->getType(); 4401 if (resultType->isDependentType()) 4402 break; 4403 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4404 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4405 << resultType << Input->getSourceRange()); 4406 // LNot always has type int. C99 6.5.3.3p5. 4407 // In C++, it's bool. C++ 5.3.1p8 4408 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4409 break; 4410 case UnaryOperator::Real: 4411 case UnaryOperator::Imag: 4412 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4413 break; 4414 case UnaryOperator::Extension: 4415 resultType = Input->getType(); 4416 break; 4417 } 4418 if (resultType.isNull()) 4419 return ExprError(); 4420 4421 InputArg.release(); 4422 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4423} 4424 4425// Unary Operators. 'Tok' is the token for the operator. 4426Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4427 tok::TokenKind Op, ExprArg input) { 4428 Expr *Input = (Expr*)input.get(); 4429 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4430 4431 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4432 // Find all of the overloaded operators visible from this 4433 // point. We perform both an operator-name lookup from the local 4434 // scope and an argument-dependent lookup based on the types of 4435 // the arguments. 4436 FunctionSet Functions; 4437 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4438 if (OverOp != OO_None) { 4439 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4440 Functions); 4441 DeclarationName OpName 4442 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4443 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4444 } 4445 4446 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4447 } 4448 4449 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4450} 4451 4452/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4453Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4454 SourceLocation LabLoc, 4455 IdentifierInfo *LabelII) { 4456 // Look up the record for this label identifier. 4457 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 4458 4459 // If we haven't seen this label yet, create a forward reference. It 4460 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4461 if (LabelDecl == 0) 4462 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4463 4464 // Create the AST node. The address of a label always has type 'void*'. 4465 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4466 Context.getPointerType(Context.VoidTy))); 4467} 4468 4469Sema::OwningExprResult 4470Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4471 SourceLocation RPLoc) { // "({..})" 4472 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4473 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4474 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4475 4476 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4477 if (isFileScope) { 4478 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4479 } 4480 4481 // FIXME: there are a variety of strange constraints to enforce here, for 4482 // example, it is not possible to goto into a stmt expression apparently. 4483 // More semantic analysis is needed. 4484 4485 // FIXME: the last statement in the compount stmt has its value used. We 4486 // should not warn about it being unused. 4487 4488 // If there are sub stmts in the compound stmt, take the type of the last one 4489 // as the type of the stmtexpr. 4490 QualType Ty = Context.VoidTy; 4491 4492 if (!Compound->body_empty()) { 4493 Stmt *LastStmt = Compound->body_back(); 4494 // If LastStmt is a label, skip down through into the body. 4495 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4496 LastStmt = Label->getSubStmt(); 4497 4498 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4499 Ty = LastExpr->getType(); 4500 } 4501 4502 // FIXME: Check that expression type is complete/non-abstract; statement 4503 // expressions are not lvalues. 4504 4505 substmt.release(); 4506 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4507} 4508 4509Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4510 SourceLocation BuiltinLoc, 4511 SourceLocation TypeLoc, 4512 TypeTy *argty, 4513 OffsetOfComponent *CompPtr, 4514 unsigned NumComponents, 4515 SourceLocation RPLoc) { 4516 // FIXME: This function leaks all expressions in the offset components on 4517 // error. 4518 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4519 assert(!ArgTy.isNull() && "Missing type argument!"); 4520 4521 bool Dependent = ArgTy->isDependentType(); 4522 4523 // We must have at least one component that refers to the type, and the first 4524 // one is known to be a field designator. Verify that the ArgTy represents 4525 // a struct/union/class. 4526 if (!Dependent && !ArgTy->isRecordType()) 4527 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4528 4529 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 4530 // with an incomplete type would be illegal. 4531 4532 // Otherwise, create a null pointer as the base, and iteratively process 4533 // the offsetof designators. 4534 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4535 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4536 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4537 ArgTy, SourceLocation()); 4538 4539 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4540 // GCC extension, diagnose them. 4541 // FIXME: This diagnostic isn't actually visible because the location is in 4542 // a system header! 4543 if (NumComponents != 1) 4544 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4545 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4546 4547 if (!Dependent) { 4548 // FIXME: Dependent case loses a lot of information here. And probably 4549 // leaks like a sieve. 4550 for (unsigned i = 0; i != NumComponents; ++i) { 4551 const OffsetOfComponent &OC = CompPtr[i]; 4552 if (OC.isBrackets) { 4553 // Offset of an array sub-field. TODO: Should we allow vector elements? 4554 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4555 if (!AT) { 4556 Res->Destroy(Context); 4557 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 4558 << Res->getType()); 4559 } 4560 4561 // FIXME: C++: Verify that operator[] isn't overloaded. 4562 4563 // Promote the array so it looks more like a normal array subscript 4564 // expression. 4565 DefaultFunctionArrayConversion(Res); 4566 4567 // C99 6.5.2.1p1 4568 Expr *Idx = static_cast<Expr*>(OC.U.E); 4569 // FIXME: Leaks Res 4570 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4571 return ExprError(Diag(Idx->getLocStart(), 4572 diag::err_typecheck_subscript) 4573 << Idx->getSourceRange()); 4574 4575 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4576 OC.LocEnd); 4577 continue; 4578 } 4579 4580 const RecordType *RC = Res->getType()->getAsRecordType(); 4581 if (!RC) { 4582 Res->Destroy(Context); 4583 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 4584 << Res->getType()); 4585 } 4586 4587 // Get the decl corresponding to this. 4588 RecordDecl *RD = RC->getDecl(); 4589 FieldDecl *MemberDecl 4590 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4591 LookupMemberName) 4592 .getAsDecl()); 4593 // FIXME: Leaks Res 4594 if (!MemberDecl) 4595 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 4596 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 4597 4598 // FIXME: C++: Verify that MemberDecl isn't a static field. 4599 // FIXME: Verify that MemberDecl isn't a bitfield. 4600 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 4601 // matter here. 4602 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4603 MemberDecl->getType().getNonReferenceType()); 4604 } 4605 } 4606 4607 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4608 Context.getSizeType(), BuiltinLoc)); 4609} 4610 4611 4612Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4613 TypeTy *arg1,TypeTy *arg2, 4614 SourceLocation RPLoc) { 4615 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4616 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4617 4618 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4619 4620 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 4621 argT1, argT2, RPLoc)); 4622} 4623 4624Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 4625 ExprArg cond, 4626 ExprArg expr1, ExprArg expr2, 4627 SourceLocation RPLoc) { 4628 Expr *CondExpr = static_cast<Expr*>(cond.get()); 4629 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 4630 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 4631 4632 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4633 4634 QualType resType; 4635 if (CondExpr->isValueDependent()) { 4636 resType = Context.DependentTy; 4637 } else { 4638 // The conditional expression is required to be a constant expression. 4639 llvm::APSInt condEval(32); 4640 SourceLocation ExpLoc; 4641 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4642 return ExprError(Diag(ExpLoc, 4643 diag::err_typecheck_choose_expr_requires_constant) 4644 << CondExpr->getSourceRange()); 4645 4646 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4647 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 4648 } 4649 4650 cond.release(); expr1.release(); expr2.release(); 4651 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4652 resType, RPLoc)); 4653} 4654 4655//===----------------------------------------------------------------------===// 4656// Clang Extensions. 4657//===----------------------------------------------------------------------===// 4658 4659/// ActOnBlockStart - This callback is invoked when a block literal is started. 4660void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4661 // Analyze block parameters. 4662 BlockSemaInfo *BSI = new BlockSemaInfo(); 4663 4664 // Add BSI to CurBlock. 4665 BSI->PrevBlockInfo = CurBlock; 4666 CurBlock = BSI; 4667 4668 BSI->ReturnType = 0; 4669 BSI->TheScope = BlockScope; 4670 BSI->hasBlockDeclRefExprs = false; 4671 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 4672 CurFunctionNeedsScopeChecking = false; 4673 4674 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4675 PushDeclContext(BlockScope, BSI->TheDecl); 4676} 4677 4678void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4679 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4680 4681 if (ParamInfo.getNumTypeObjects() == 0 4682 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4683 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4684 4685 // The type is entirely optional as well, if none, use DependentTy. 4686 if (T.isNull()) 4687 T = Context.DependentTy; 4688 4689 // The parameter list is optional, if there was none, assume (). 4690 if (!T->isFunctionType()) 4691 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4692 4693 CurBlock->hasPrototype = true; 4694 CurBlock->isVariadic = false; 4695 4696 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 4697 4698 // Do not allow returning a objc interface by-value. 4699 if (RetTy->isObjCInterfaceType()) { 4700 Diag(ParamInfo.getSourceRange().getBegin(), 4701 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 4702 return; 4703 } 4704 4705 if (!RetTy->isDependentType()) 4706 CurBlock->ReturnType = RetTy.getTypePtr(); 4707 return; 4708 } 4709 4710 // Analyze arguments to block. 4711 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4712 "Not a function declarator!"); 4713 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4714 4715 CurBlock->hasPrototype = FTI.hasPrototype; 4716 CurBlock->isVariadic = true; 4717 4718 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4719 // no arguments, not a function that takes a single void argument. 4720 if (FTI.hasPrototype && 4721 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4722 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 4723 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 4724 // empty arg list, don't push any params. 4725 CurBlock->isVariadic = false; 4726 } else if (FTI.hasPrototype) { 4727 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4728 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 4729 CurBlock->isVariadic = FTI.isVariadic; 4730 } 4731 CurBlock->TheDecl->setParams(Context, &CurBlock->Params[0], 4732 CurBlock->Params.size()); 4733 4734 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4735 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4736 // If this has an identifier, add it to the scope stack. 4737 if ((*AI)->getIdentifier()) 4738 PushOnScopeChains(*AI, CurBlock->TheScope); 4739 4740 // Analyze the return type. 4741 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4742 QualType RetTy = T->getAsFunctionType()->getResultType(); 4743 4744 // Do not allow returning a objc interface by-value. 4745 if (RetTy->isObjCInterfaceType()) { 4746 Diag(ParamInfo.getSourceRange().getBegin(), 4747 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 4748 } else if (!RetTy->isDependentType()) 4749 CurBlock->ReturnType = RetTy.getTypePtr(); 4750} 4751 4752/// ActOnBlockError - If there is an error parsing a block, this callback 4753/// is invoked to pop the information about the block from the action impl. 4754void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4755 // Ensure that CurBlock is deleted. 4756 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4757 4758 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 4759 4760 // Pop off CurBlock, handle nested blocks. 4761 PopDeclContext(); 4762 CurBlock = CurBlock->PrevBlockInfo; 4763 // FIXME: Delete the ParmVarDecl objects as well??? 4764} 4765 4766/// ActOnBlockStmtExpr - This is called when the body of a block statement 4767/// literal was successfully completed. ^(int x){...} 4768Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 4769 StmtArg body, Scope *CurScope) { 4770 // If blocks are disabled, emit an error. 4771 if (!LangOpts.Blocks) 4772 Diag(CaretLoc, diag::err_blocks_disable); 4773 4774 // Ensure that CurBlock is deleted. 4775 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4776 4777 PopDeclContext(); 4778 4779 // Pop off CurBlock, handle nested blocks. 4780 CurBlock = CurBlock->PrevBlockInfo; 4781 4782 QualType RetTy = Context.VoidTy; 4783 if (BSI->ReturnType) 4784 RetTy = QualType(BSI->ReturnType, 0); 4785 4786 llvm::SmallVector<QualType, 8> ArgTypes; 4787 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4788 ArgTypes.push_back(BSI->Params[i]->getType()); 4789 4790 QualType BlockTy; 4791 if (!BSI->hasPrototype) 4792 BlockTy = Context.getFunctionNoProtoType(RetTy); 4793 else 4794 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 4795 BSI->isVariadic, 0); 4796 4797 // FIXME: Check that return/parameter types are complete/non-abstract 4798 4799 BlockTy = Context.getBlockPointerType(BlockTy); 4800 4801 // If needed, diagnose invalid gotos and switches in the block. 4802 if (CurFunctionNeedsScopeChecking) 4803 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 4804 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 4805 4806 BSI->TheDecl->setBody(static_cast<CompoundStmt*>(body.release())); 4807 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 4808 BSI->hasBlockDeclRefExprs)); 4809} 4810 4811Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 4812 ExprArg expr, TypeTy *type, 4813 SourceLocation RPLoc) { 4814 QualType T = QualType::getFromOpaquePtr(type); 4815 Expr *E = static_cast<Expr*>(expr.get()); 4816 Expr *OrigExpr = E; 4817 4818 InitBuiltinVaListType(); 4819 4820 // Get the va_list type 4821 QualType VaListType = Context.getBuiltinVaListType(); 4822 // Deal with implicit array decay; for example, on x86-64, 4823 // va_list is an array, but it's supposed to decay to 4824 // a pointer for va_arg. 4825 if (VaListType->isArrayType()) 4826 VaListType = Context.getArrayDecayedType(VaListType); 4827 // Make sure the input expression also decays appropriately. 4828 UsualUnaryConversions(E); 4829 4830 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) { 4831 return ExprError(Diag(E->getLocStart(), 4832 diag::err_first_argument_to_va_arg_not_of_type_va_list) 4833 << OrigExpr->getType() << E->getSourceRange()); 4834 } 4835 4836 // FIXME: Check that type is complete/non-abstract 4837 // FIXME: Warn if a non-POD type is passed in. 4838 4839 expr.release(); 4840 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 4841 RPLoc)); 4842} 4843 4844Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 4845 // The type of __null will be int or long, depending on the size of 4846 // pointers on the target. 4847 QualType Ty; 4848 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 4849 Ty = Context.IntTy; 4850 else 4851 Ty = Context.LongTy; 4852 4853 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 4854} 4855 4856bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 4857 SourceLocation Loc, 4858 QualType DstType, QualType SrcType, 4859 Expr *SrcExpr, const char *Flavor) { 4860 // Decode the result (notice that AST's are still created for extensions). 4861 bool isInvalid = false; 4862 unsigned DiagKind; 4863 switch (ConvTy) { 4864 default: assert(0 && "Unknown conversion type"); 4865 case Compatible: return false; 4866 case PointerToInt: 4867 DiagKind = diag::ext_typecheck_convert_pointer_int; 4868 break; 4869 case IntToPointer: 4870 DiagKind = diag::ext_typecheck_convert_int_pointer; 4871 break; 4872 case IncompatiblePointer: 4873 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 4874 break; 4875 case IncompatiblePointerSign: 4876 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 4877 break; 4878 case FunctionVoidPointer: 4879 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 4880 break; 4881 case CompatiblePointerDiscardsQualifiers: 4882 // If the qualifiers lost were because we were applying the 4883 // (deprecated) C++ conversion from a string literal to a char* 4884 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 4885 // Ideally, this check would be performed in 4886 // CheckPointerTypesForAssignment. However, that would require a 4887 // bit of refactoring (so that the second argument is an 4888 // expression, rather than a type), which should be done as part 4889 // of a larger effort to fix CheckPointerTypesForAssignment for 4890 // C++ semantics. 4891 if (getLangOptions().CPlusPlus && 4892 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 4893 return false; 4894 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 4895 break; 4896 case IntToBlockPointer: 4897 DiagKind = diag::err_int_to_block_pointer; 4898 break; 4899 case IncompatibleBlockPointer: 4900 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 4901 break; 4902 case IncompatibleObjCQualifiedId: 4903 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 4904 // it can give a more specific diagnostic. 4905 DiagKind = diag::warn_incompatible_qualified_id; 4906 break; 4907 case IncompatibleVectors: 4908 DiagKind = diag::warn_incompatible_vectors; 4909 break; 4910 case Incompatible: 4911 DiagKind = diag::err_typecheck_convert_incompatible; 4912 isInvalid = true; 4913 break; 4914 } 4915 4916 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 4917 << SrcExpr->getSourceRange(); 4918 return isInvalid; 4919} 4920 4921bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 4922{ 4923 Expr::EvalResult EvalResult; 4924 4925 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 4926 EvalResult.HasSideEffects) { 4927 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 4928 4929 if (EvalResult.Diag) { 4930 // We only show the note if it's not the usual "invalid subexpression" 4931 // or if it's actually in a subexpression. 4932 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 4933 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 4934 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4935 } 4936 4937 return true; 4938 } 4939 4940 if (EvalResult.Diag) { 4941 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 4942 E->getSourceRange(); 4943 4944 // Print the reason it's not a constant. 4945 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4946 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4947 } 4948 4949 if (Result) 4950 *Result = EvalResult.Val.getInt(); 4951 return false; 4952} 4953