SemaExpr.cpp revision aa25759d55be0eabc45fc77455ec71caf3486d1c
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 if (Lookup.isAmbiguous()) { 673 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 674 SS && SS->isSet() ? SS->getRange() 675 : SourceRange()); 676 return ExprError(); 677 } 678 679 NamedDecl *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(); 698 699 // If we're referencing an invalid decl, just return this as a silent 700 // error node. The error diagnostic was already emitted on the decl. 701 if (IV->isInvalidDecl()) 702 return ExprError(); 703 704 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 705 // If a class method attemps to use a free standing ivar, this is 706 // an error. 707 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 708 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 709 << IV->getDeclName()); 710 // If a class method uses a global variable, even if an ivar with 711 // same name exists, use the global. 712 if (!IsClsMethod) { 713 if (IV->getAccessControl() == ObjCIvarDecl::Private && 714 ClassDeclared != IFace) 715 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 716 // FIXME: This should use a new expr for a direct reference, don't turn 717 // this into Self->ivar, just return a BareIVarExpr or something. 718 IdentifierInfo &II = Context.Idents.get("self"); 719 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 720 return Owned(new (Context) 721 ObjCIvarRefExpr(IV, IV->getType(), Loc, 722 static_cast<Expr*>(SelfExpr.release()), 723 true, true)); 724 } 725 } 726 } 727 else if (getCurMethodDecl()->isInstanceMethod()) { 728 // We should warn if a local variable hides an ivar. 729 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 730 ObjCInterfaceDecl *ClassDeclared; 731 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(Context, II, 732 ClassDeclared)) { 733 if (IV->getAccessControl() != ObjCIvarDecl::Private || 734 IFace == ClassDeclared) 735 Diag(Loc, diag::warn_ivar_use_hidden) << IV->getDeclName(); 736 } 737 } 738 // Needed to implement property "super.method" notation. 739 if (D == 0 && II->isStr("super")) { 740 QualType T; 741 742 if (getCurMethodDecl()->isInstanceMethod()) 743 T = Context.getPointerType(Context.getObjCInterfaceType( 744 getCurMethodDecl()->getClassInterface())); 745 else 746 T = Context.getObjCClassType(); 747 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 748 } 749 } 750 751 // Determine whether this name might be a candidate for 752 // argument-dependent lookup. 753 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 754 HasTrailingLParen; 755 756 if (ADL && D == 0) { 757 // We've seen something of the form 758 // 759 // identifier( 760 // 761 // and we did not find any entity by the name 762 // "identifier". However, this identifier is still subject to 763 // argument-dependent lookup, so keep track of the name. 764 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 765 Context.OverloadTy, 766 Loc)); 767 } 768 769 if (D == 0) { 770 // Otherwise, this could be an implicitly declared function reference (legal 771 // in C90, extension in C99). 772 if (HasTrailingLParen && II && 773 !getLangOptions().CPlusPlus) // Not in C++. 774 D = ImplicitlyDefineFunction(Loc, *II, S); 775 else { 776 // If this name wasn't predeclared and if this is not a function call, 777 // diagnose the problem. 778 if (SS && !SS->isEmpty()) 779 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 780 << Name << SS->getRange()); 781 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 782 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 783 return ExprError(Diag(Loc, diag::err_undeclared_use) 784 << Name.getAsString()); 785 else 786 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 787 } 788 } 789 790 // If this is an expression of the form &Class::member, don't build an 791 // implicit member ref, because we want a pointer to the member in general, 792 // not any specific instance's member. 793 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 794 DeclContext *DC = computeDeclContext(*SS); 795 if (D && isa<CXXRecordDecl>(DC)) { 796 QualType DType; 797 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 798 DType = FD->getType().getNonReferenceType(); 799 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 800 DType = Method->getType(); 801 } else if (isa<OverloadedFunctionDecl>(D)) { 802 DType = Context.OverloadTy; 803 } 804 // Could be an inner type. That's diagnosed below, so ignore it here. 805 if (!DType.isNull()) { 806 // The pointer is type- and value-dependent if it points into something 807 // dependent. 808 bool Dependent = false; 809 for (; DC; DC = DC->getParent()) { 810 // FIXME: could stop early at namespace scope. 811 if (DC->isRecord()) { 812 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 813 if (Context.getTypeDeclType(Record)->isDependentType()) { 814 Dependent = true; 815 break; 816 } 817 } 818 } 819 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 820 } 821 } 822 } 823 824 // We may have found a field within an anonymous union or struct 825 // (C++ [class.union]). 826 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 827 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 828 return BuildAnonymousStructUnionMemberReference(Loc, FD); 829 830 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 831 if (!MD->isStatic()) { 832 // C++ [class.mfct.nonstatic]p2: 833 // [...] if name lookup (3.4.1) resolves the name in the 834 // id-expression to a nonstatic nontype member of class X or of 835 // a base class of X, the id-expression is transformed into a 836 // class member access expression (5.2.5) using (*this) (9.3.2) 837 // as the postfix-expression to the left of the '.' operator. 838 DeclContext *Ctx = 0; 839 QualType MemberType; 840 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 841 Ctx = FD->getDeclContext(); 842 MemberType = FD->getType(); 843 844 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 845 MemberType = RefType->getPointeeType(); 846 else if (!FD->isMutable()) { 847 unsigned combinedQualifiers 848 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 849 MemberType = MemberType.getQualifiedType(combinedQualifiers); 850 } 851 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 852 if (!Method->isStatic()) { 853 Ctx = Method->getParent(); 854 MemberType = Method->getType(); 855 } 856 } else if (OverloadedFunctionDecl *Ovl 857 = dyn_cast<OverloadedFunctionDecl>(D)) { 858 for (OverloadedFunctionDecl::function_iterator 859 Func = Ovl->function_begin(), 860 FuncEnd = Ovl->function_end(); 861 Func != FuncEnd; ++Func) { 862 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 863 if (!DMethod->isStatic()) { 864 Ctx = Ovl->getDeclContext(); 865 MemberType = Context.OverloadTy; 866 break; 867 } 868 } 869 } 870 871 if (Ctx && Ctx->isRecord()) { 872 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 873 QualType ThisType = Context.getTagDeclType(MD->getParent()); 874 if ((Context.getCanonicalType(CtxType) 875 == Context.getCanonicalType(ThisType)) || 876 IsDerivedFrom(ThisType, CtxType)) { 877 // Build the implicit member access expression. 878 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 879 MD->getThisType(Context)); 880 return Owned(new (Context) MemberExpr(This, true, D, 881 SourceLocation(), MemberType)); 882 } 883 } 884 } 885 } 886 887 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 888 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 889 if (MD->isStatic()) 890 // "invalid use of member 'x' in static member function" 891 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 892 << FD->getDeclName()); 893 } 894 895 // Any other ways we could have found the field in a well-formed 896 // program would have been turned into implicit member expressions 897 // above. 898 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 899 << FD->getDeclName()); 900 } 901 902 if (isa<TypedefDecl>(D)) 903 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 904 if (isa<ObjCInterfaceDecl>(D)) 905 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 906 if (isa<NamespaceDecl>(D)) 907 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 908 909 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 910 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 911 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 912 false, false, SS)); 913 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 914 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 915 false, false, SS)); 916 ValueDecl *VD = cast<ValueDecl>(D); 917 918 // Check whether this declaration can be used. Note that we suppress 919 // this check when we're going to perform argument-dependent lookup 920 // on this function name, because this might not be the function 921 // that overload resolution actually selects. 922 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 923 return ExprError(); 924 925 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 926 // Warn about constructs like: 927 // if (void *X = foo()) { ... } else { X }. 928 // In the else block, the pointer is always false. 929 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 930 Scope *CheckS = S; 931 while (CheckS) { 932 if (CheckS->isWithinElse() && 933 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 934 if (Var->getType()->isBooleanType()) 935 ExprError(Diag(Loc, diag::warn_value_always_false) 936 << Var->getDeclName()); 937 else 938 ExprError(Diag(Loc, diag::warn_value_always_zero) 939 << Var->getDeclName()); 940 break; 941 } 942 943 // Move up one more control parent to check again. 944 CheckS = CheckS->getControlParent(); 945 if (CheckS) 946 CheckS = CheckS->getParent(); 947 } 948 } 949 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 950 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 951 // C99 DR 316 says that, if a function type comes from a 952 // function definition (without a prototype), that type is only 953 // used for checking compatibility. Therefore, when referencing 954 // the function, we pretend that we don't have the full function 955 // type. 956 QualType T = Func->getType(); 957 QualType NoProtoType = T; 958 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 959 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 960 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 961 } 962 } 963 964 // Only create DeclRefExpr's for valid Decl's. 965 if (VD->isInvalidDecl()) 966 return ExprError(); 967 968 // If the identifier reference is inside a block, and it refers to a value 969 // that is outside the block, create a BlockDeclRefExpr instead of a 970 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 971 // the block is formed. 972 // 973 // We do not do this for things like enum constants, global variables, etc, 974 // as they do not get snapshotted. 975 // 976 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 977 QualType ExprTy = VD->getType().getNonReferenceType(); 978 // The BlocksAttr indicates the variable is bound by-reference. 979 if (VD->getAttr<BlocksAttr>()) 980 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 981 982 // Variable will be bound by-copy, make it const within the closure. 983 ExprTy.addConst(); 984 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false)); 985 } 986 // If this reference is not in a block or if the referenced variable is 987 // within the block, create a normal DeclRefExpr. 988 989 bool TypeDependent = false; 990 bool ValueDependent = false; 991 if (getLangOptions().CPlusPlus) { 992 // C++ [temp.dep.expr]p3: 993 // An id-expression is type-dependent if it contains: 994 // - an identifier that was declared with a dependent type, 995 if (VD->getType()->isDependentType()) 996 TypeDependent = true; 997 // - FIXME: a template-id that is dependent, 998 // - a conversion-function-id that specifies a dependent type, 999 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 1000 Name.getCXXNameType()->isDependentType()) 1001 TypeDependent = true; 1002 // - a nested-name-specifier that contains a class-name that 1003 // names a dependent type. 1004 else if (SS && !SS->isEmpty()) { 1005 for (DeclContext *DC = computeDeclContext(*SS); 1006 DC; DC = DC->getParent()) { 1007 // FIXME: could stop early at namespace scope. 1008 if (DC->isRecord()) { 1009 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 1010 if (Context.getTypeDeclType(Record)->isDependentType()) { 1011 TypeDependent = true; 1012 break; 1013 } 1014 } 1015 } 1016 } 1017 1018 // C++ [temp.dep.constexpr]p2: 1019 // 1020 // An identifier is value-dependent if it is: 1021 // - a name declared with a dependent type, 1022 if (TypeDependent) 1023 ValueDependent = true; 1024 // - the name of a non-type template parameter, 1025 else if (isa<NonTypeTemplateParmDecl>(VD)) 1026 ValueDependent = true; 1027 // - a constant with integral or enumeration type and is 1028 // initialized with an expression that is value-dependent 1029 // (FIXME!). 1030 } 1031 1032 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 1033 TypeDependent, ValueDependent, SS)); 1034} 1035 1036Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 1037 tok::TokenKind Kind) { 1038 PredefinedExpr::IdentType IT; 1039 1040 switch (Kind) { 1041 default: assert(0 && "Unknown simple primary expr!"); 1042 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1043 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1044 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1045 } 1046 1047 // Pre-defined identifiers are of type char[x], where x is the length of the 1048 // string. 1049 unsigned Length; 1050 if (FunctionDecl *FD = getCurFunctionDecl()) 1051 Length = FD->getIdentifier()->getLength(); 1052 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1053 Length = MD->getSynthesizedMethodSize(); 1054 else { 1055 Diag(Loc, diag::ext_predef_outside_function); 1056 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1057 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1058 } 1059 1060 1061 llvm::APInt LengthI(32, Length + 1); 1062 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1063 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1064 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1065} 1066 1067Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1068 llvm::SmallString<16> CharBuffer; 1069 CharBuffer.resize(Tok.getLength()); 1070 const char *ThisTokBegin = &CharBuffer[0]; 1071 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1072 1073 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1074 Tok.getLocation(), PP); 1075 if (Literal.hadError()) 1076 return ExprError(); 1077 1078 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1079 1080 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1081 Literal.isWide(), 1082 type, Tok.getLocation())); 1083} 1084 1085Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1086 // Fast path for a single digit (which is quite common). A single digit 1087 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1088 if (Tok.getLength() == 1) { 1089 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1090 unsigned IntSize = Context.Target.getIntWidth(); 1091 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1092 Context.IntTy, Tok.getLocation())); 1093 } 1094 1095 llvm::SmallString<512> IntegerBuffer; 1096 // Add padding so that NumericLiteralParser can overread by one character. 1097 IntegerBuffer.resize(Tok.getLength()+1); 1098 const char *ThisTokBegin = &IntegerBuffer[0]; 1099 1100 // Get the spelling of the token, which eliminates trigraphs, etc. 1101 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1102 1103 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1104 Tok.getLocation(), PP); 1105 if (Literal.hadError) 1106 return ExprError(); 1107 1108 Expr *Res; 1109 1110 if (Literal.isFloatingLiteral()) { 1111 QualType Ty; 1112 if (Literal.isFloat) 1113 Ty = Context.FloatTy; 1114 else if (!Literal.isLong) 1115 Ty = Context.DoubleTy; 1116 else 1117 Ty = Context.LongDoubleTy; 1118 1119 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1120 1121 // isExact will be set by GetFloatValue(). 1122 bool isExact = false; 1123 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1124 &isExact, Ty, Tok.getLocation()); 1125 1126 } else if (!Literal.isIntegerLiteral()) { 1127 return ExprError(); 1128 } else { 1129 QualType Ty; 1130 1131 // long long is a C99 feature. 1132 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1133 Literal.isLongLong) 1134 Diag(Tok.getLocation(), diag::ext_longlong); 1135 1136 // Get the value in the widest-possible width. 1137 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1138 1139 if (Literal.GetIntegerValue(ResultVal)) { 1140 // If this value didn't fit into uintmax_t, warn and force to ull. 1141 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1142 Ty = Context.UnsignedLongLongTy; 1143 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1144 "long long is not intmax_t?"); 1145 } else { 1146 // If this value fits into a ULL, try to figure out what else it fits into 1147 // according to the rules of C99 6.4.4.1p5. 1148 1149 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1150 // be an unsigned int. 1151 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1152 1153 // Check from smallest to largest, picking the smallest type we can. 1154 unsigned Width = 0; 1155 if (!Literal.isLong && !Literal.isLongLong) { 1156 // Are int/unsigned possibilities? 1157 unsigned IntSize = Context.Target.getIntWidth(); 1158 1159 // Does it fit in a unsigned int? 1160 if (ResultVal.isIntN(IntSize)) { 1161 // Does it fit in a signed int? 1162 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1163 Ty = Context.IntTy; 1164 else if (AllowUnsigned) 1165 Ty = Context.UnsignedIntTy; 1166 Width = IntSize; 1167 } 1168 } 1169 1170 // Are long/unsigned long possibilities? 1171 if (Ty.isNull() && !Literal.isLongLong) { 1172 unsigned LongSize = Context.Target.getLongWidth(); 1173 1174 // Does it fit in a unsigned long? 1175 if (ResultVal.isIntN(LongSize)) { 1176 // Does it fit in a signed long? 1177 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1178 Ty = Context.LongTy; 1179 else if (AllowUnsigned) 1180 Ty = Context.UnsignedLongTy; 1181 Width = LongSize; 1182 } 1183 } 1184 1185 // Finally, check long long if needed. 1186 if (Ty.isNull()) { 1187 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1188 1189 // Does it fit in a unsigned long long? 1190 if (ResultVal.isIntN(LongLongSize)) { 1191 // Does it fit in a signed long long? 1192 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1193 Ty = Context.LongLongTy; 1194 else if (AllowUnsigned) 1195 Ty = Context.UnsignedLongLongTy; 1196 Width = LongLongSize; 1197 } 1198 } 1199 1200 // If we still couldn't decide a type, we probably have something that 1201 // does not fit in a signed long long, but has no U suffix. 1202 if (Ty.isNull()) { 1203 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1204 Ty = Context.UnsignedLongLongTy; 1205 Width = Context.Target.getLongLongWidth(); 1206 } 1207 1208 if (ResultVal.getBitWidth() != Width) 1209 ResultVal.trunc(Width); 1210 } 1211 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1212 } 1213 1214 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1215 if (Literal.isImaginary) 1216 Res = new (Context) ImaginaryLiteral(Res, 1217 Context.getComplexType(Res->getType())); 1218 1219 return Owned(Res); 1220} 1221 1222Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1223 SourceLocation R, ExprArg Val) { 1224 Expr *E = (Expr *)Val.release(); 1225 assert((E != 0) && "ActOnParenExpr() missing expr"); 1226 return Owned(new (Context) ParenExpr(L, R, E)); 1227} 1228 1229/// The UsualUnaryConversions() function is *not* called by this routine. 1230/// See C99 6.3.2.1p[2-4] for more details. 1231bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1232 SourceLocation OpLoc, 1233 const SourceRange &ExprRange, 1234 bool isSizeof) { 1235 if (exprType->isDependentType()) 1236 return false; 1237 1238 // C99 6.5.3.4p1: 1239 if (isa<FunctionType>(exprType)) { 1240 // alignof(function) is allowed as an extension. 1241 if (isSizeof) 1242 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1243 return false; 1244 } 1245 1246 // Allow sizeof(void)/alignof(void) as an extension. 1247 if (exprType->isVoidType()) { 1248 Diag(OpLoc, diag::ext_sizeof_void_type) 1249 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1250 return false; 1251 } 1252 1253 if (RequireCompleteType(OpLoc, exprType, 1254 isSizeof ? diag::err_sizeof_incomplete_type : 1255 diag::err_alignof_incomplete_type, 1256 ExprRange)) 1257 return true; 1258 1259 // Reject sizeof(interface) and sizeof(interface<proto>) in 64-bit mode. 1260 if (LangOpts.ObjCNonFragileABI && exprType->isObjCInterfaceType()) { 1261 Diag(OpLoc, diag::err_sizeof_nonfragile_interface) 1262 << exprType << isSizeof << ExprRange; 1263 return true; 1264 } 1265 1266 return false; 1267} 1268 1269bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1270 const SourceRange &ExprRange) { 1271 E = E->IgnoreParens(); 1272 1273 // alignof decl is always ok. 1274 if (isa<DeclRefExpr>(E)) 1275 return false; 1276 1277 // Cannot know anything else if the expression is dependent. 1278 if (E->isTypeDependent()) 1279 return false; 1280 1281 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1282 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { 1283 if (FD->isBitField()) { 1284 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1285 return true; 1286 } 1287 // Other fields are ok. 1288 return false; 1289 } 1290 } 1291 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1292} 1293 1294/// \brief Build a sizeof or alignof expression given a type operand. 1295Action::OwningExprResult 1296Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1297 bool isSizeOf, SourceRange R) { 1298 if (T.isNull()) 1299 return ExprError(); 1300 1301 if (!T->isDependentType() && 1302 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1303 return ExprError(); 1304 1305 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1306 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1307 Context.getSizeType(), OpLoc, 1308 R.getEnd())); 1309} 1310 1311/// \brief Build a sizeof or alignof expression given an expression 1312/// operand. 1313Action::OwningExprResult 1314Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1315 bool isSizeOf, SourceRange R) { 1316 // Verify that the operand is valid. 1317 bool isInvalid = false; 1318 if (E->isTypeDependent()) { 1319 // Delay type-checking for type-dependent expressions. 1320 } else if (!isSizeOf) { 1321 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1322 } else if (E->isBitField()) { // C99 6.5.3.4p1. 1323 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1324 isInvalid = true; 1325 } else { 1326 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1327 } 1328 1329 if (isInvalid) 1330 return ExprError(); 1331 1332 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1333 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1334 Context.getSizeType(), OpLoc, 1335 R.getEnd())); 1336} 1337 1338/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1339/// the same for @c alignof and @c __alignof 1340/// Note that the ArgRange is invalid if isType is false. 1341Action::OwningExprResult 1342Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1343 void *TyOrEx, const SourceRange &ArgRange) { 1344 // If error parsing type, ignore. 1345 if (TyOrEx == 0) return ExprError(); 1346 1347 if (isType) { 1348 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1349 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1350 } 1351 1352 // Get the end location. 1353 Expr *ArgEx = (Expr *)TyOrEx; 1354 Action::OwningExprResult Result 1355 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1356 1357 if (Result.isInvalid()) 1358 DeleteExpr(ArgEx); 1359 1360 return move(Result); 1361} 1362 1363QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1364 if (V->isTypeDependent()) 1365 return Context.DependentTy; 1366 1367 // These operators return the element type of a complex type. 1368 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1369 return CT->getElementType(); 1370 1371 // Otherwise they pass through real integer and floating point types here. 1372 if (V->getType()->isArithmeticType()) 1373 return V->getType(); 1374 1375 // Reject anything else. 1376 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1377 << (isReal ? "__real" : "__imag"); 1378 return QualType(); 1379} 1380 1381 1382 1383Action::OwningExprResult 1384Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1385 tok::TokenKind Kind, ExprArg Input) { 1386 Expr *Arg = (Expr *)Input.get(); 1387 1388 UnaryOperator::Opcode Opc; 1389 switch (Kind) { 1390 default: assert(0 && "Unknown unary op!"); 1391 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1392 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1393 } 1394 1395 if (getLangOptions().CPlusPlus && 1396 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1397 // Which overloaded operator? 1398 OverloadedOperatorKind OverOp = 1399 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1400 1401 // C++ [over.inc]p1: 1402 // 1403 // [...] If the function is a member function with one 1404 // parameter (which shall be of type int) or a non-member 1405 // function with two parameters (the second of which shall be 1406 // of type int), it defines the postfix increment operator ++ 1407 // for objects of that type. When the postfix increment is 1408 // called as a result of using the ++ operator, the int 1409 // argument will have value zero. 1410 Expr *Args[2] = { 1411 Arg, 1412 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1413 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1414 }; 1415 1416 // Build the candidate set for overloading 1417 OverloadCandidateSet CandidateSet; 1418 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1419 1420 // Perform overload resolution. 1421 OverloadCandidateSet::iterator Best; 1422 switch (BestViableFunction(CandidateSet, Best)) { 1423 case OR_Success: { 1424 // We found a built-in operator or an overloaded operator. 1425 FunctionDecl *FnDecl = Best->Function; 1426 1427 if (FnDecl) { 1428 // We matched an overloaded operator. Build a call to that 1429 // operator. 1430 1431 // Convert the arguments. 1432 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1433 if (PerformObjectArgumentInitialization(Arg, Method)) 1434 return ExprError(); 1435 } else { 1436 // Convert the arguments. 1437 if (PerformCopyInitialization(Arg, 1438 FnDecl->getParamDecl(0)->getType(), 1439 "passing")) 1440 return ExprError(); 1441 } 1442 1443 // Determine the result type 1444 QualType ResultTy 1445 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1446 ResultTy = ResultTy.getNonReferenceType(); 1447 1448 // Build the actual expression node. 1449 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1450 SourceLocation()); 1451 UsualUnaryConversions(FnExpr); 1452 1453 Input.release(); 1454 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1455 Args, 2, ResultTy, 1456 OpLoc)); 1457 } else { 1458 // We matched a built-in operator. Convert the arguments, then 1459 // break out so that we will build the appropriate built-in 1460 // operator node. 1461 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1462 "passing")) 1463 return ExprError(); 1464 1465 break; 1466 } 1467 } 1468 1469 case OR_No_Viable_Function: 1470 // No viable function; fall through to handling this as a 1471 // built-in operator, which will produce an error message for us. 1472 break; 1473 1474 case OR_Ambiguous: 1475 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1476 << UnaryOperator::getOpcodeStr(Opc) 1477 << Arg->getSourceRange(); 1478 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1479 return ExprError(); 1480 1481 case OR_Deleted: 1482 Diag(OpLoc, diag::err_ovl_deleted_oper) 1483 << Best->Function->isDeleted() 1484 << UnaryOperator::getOpcodeStr(Opc) 1485 << Arg->getSourceRange(); 1486 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1487 return ExprError(); 1488 } 1489 1490 // Either we found no viable overloaded operator or we matched a 1491 // built-in operator. In either case, fall through to trying to 1492 // build a built-in operation. 1493 } 1494 1495 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1496 Opc == UnaryOperator::PostInc); 1497 if (result.isNull()) 1498 return ExprError(); 1499 Input.release(); 1500 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1501} 1502 1503Action::OwningExprResult 1504Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1505 ExprArg Idx, SourceLocation RLoc) { 1506 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1507 *RHSExp = static_cast<Expr*>(Idx.get()); 1508 1509 if (getLangOptions().CPlusPlus && 1510 (LHSExp->getType()->isRecordType() || 1511 LHSExp->getType()->isEnumeralType() || 1512 RHSExp->getType()->isRecordType() || 1513 RHSExp->getType()->isEnumeralType())) { 1514 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1515 // to the candidate set. 1516 OverloadCandidateSet CandidateSet; 1517 Expr *Args[2] = { LHSExp, RHSExp }; 1518 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1519 SourceRange(LLoc, RLoc)); 1520 1521 // Perform overload resolution. 1522 OverloadCandidateSet::iterator Best; 1523 switch (BestViableFunction(CandidateSet, Best)) { 1524 case OR_Success: { 1525 // We found a built-in operator or an overloaded operator. 1526 FunctionDecl *FnDecl = Best->Function; 1527 1528 if (FnDecl) { 1529 // We matched an overloaded operator. Build a call to that 1530 // operator. 1531 1532 // Convert the arguments. 1533 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1534 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1535 PerformCopyInitialization(RHSExp, 1536 FnDecl->getParamDecl(0)->getType(), 1537 "passing")) 1538 return ExprError(); 1539 } else { 1540 // Convert the arguments. 1541 if (PerformCopyInitialization(LHSExp, 1542 FnDecl->getParamDecl(0)->getType(), 1543 "passing") || 1544 PerformCopyInitialization(RHSExp, 1545 FnDecl->getParamDecl(1)->getType(), 1546 "passing")) 1547 return ExprError(); 1548 } 1549 1550 // Determine the result type 1551 QualType ResultTy 1552 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1553 ResultTy = ResultTy.getNonReferenceType(); 1554 1555 // Build the actual expression node. 1556 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1557 SourceLocation()); 1558 UsualUnaryConversions(FnExpr); 1559 1560 Base.release(); 1561 Idx.release(); 1562 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1563 FnExpr, Args, 2, 1564 ResultTy, LLoc)); 1565 } else { 1566 // We matched a built-in operator. Convert the arguments, then 1567 // break out so that we will build the appropriate built-in 1568 // operator node. 1569 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1570 "passing") || 1571 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1572 "passing")) 1573 return ExprError(); 1574 1575 break; 1576 } 1577 } 1578 1579 case OR_No_Viable_Function: 1580 // No viable function; fall through to handling this as a 1581 // built-in operator, which will produce an error message for us. 1582 break; 1583 1584 case OR_Ambiguous: 1585 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1586 << "[]" 1587 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1588 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1589 return ExprError(); 1590 1591 case OR_Deleted: 1592 Diag(LLoc, diag::err_ovl_deleted_oper) 1593 << Best->Function->isDeleted() 1594 << "[]" 1595 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1596 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1597 return ExprError(); 1598 } 1599 1600 // Either we found no viable overloaded operator or we matched a 1601 // built-in operator. In either case, fall through to trying to 1602 // build a built-in operation. 1603 } 1604 1605 // Perform default conversions. 1606 DefaultFunctionArrayConversion(LHSExp); 1607 DefaultFunctionArrayConversion(RHSExp); 1608 1609 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1610 1611 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1612 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1613 // in the subscript position. As a result, we need to derive the array base 1614 // and index from the expression types. 1615 Expr *BaseExpr, *IndexExpr; 1616 QualType ResultType; 1617 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1618 BaseExpr = LHSExp; 1619 IndexExpr = RHSExp; 1620 ResultType = Context.DependentTy; 1621 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1622 BaseExpr = LHSExp; 1623 IndexExpr = RHSExp; 1624 // FIXME: need to deal with const... 1625 ResultType = PTy->getPointeeType(); 1626 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1627 // Handle the uncommon case of "123[Ptr]". 1628 BaseExpr = RHSExp; 1629 IndexExpr = LHSExp; 1630 // FIXME: need to deal with const... 1631 ResultType = PTy->getPointeeType(); 1632 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1633 BaseExpr = LHSExp; // vectors: V[123] 1634 IndexExpr = RHSExp; 1635 1636 // FIXME: need to deal with const... 1637 ResultType = VTy->getElementType(); 1638 } else { 1639 return ExprError(Diag(LHSExp->getLocStart(), 1640 diag::err_typecheck_subscript_value) << RHSExp->getSourceRange()); 1641 } 1642 // C99 6.5.2.1p1 1643 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1644 return ExprError(Diag(IndexExpr->getLocStart(), 1645 diag::err_typecheck_subscript) << IndexExpr->getSourceRange()); 1646 1647 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1648 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1649 // type. Note that Functions are not objects, and that (in C99 parlance) 1650 // incomplete types are not object types. 1651 if (ResultType->isFunctionType()) { 1652 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1653 << ResultType << BaseExpr->getSourceRange(); 1654 return ExprError(); 1655 } 1656 1657 if (!ResultType->isDependentType() && 1658 RequireCompleteType(LLoc, ResultType, diag::err_subscript_incomplete_type, 1659 BaseExpr->getSourceRange())) 1660 return ExprError(); 1661 1662 // Diagnose bad cases where we step over interface counts. 1663 if (ResultType->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 1664 Diag(LLoc, diag::err_subscript_nonfragile_interface) 1665 << ResultType << BaseExpr->getSourceRange(); 1666 return ExprError(); 1667 } 1668 1669 Base.release(); 1670 Idx.release(); 1671 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1672 ResultType, RLoc)); 1673} 1674 1675QualType Sema:: 1676CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1677 IdentifierInfo &CompName, SourceLocation CompLoc) { 1678 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1679 1680 // The vector accessor can't exceed the number of elements. 1681 const char *compStr = CompName.getName(); 1682 1683 // This flag determines whether or not the component is one of the four 1684 // special names that indicate a subset of exactly half the elements are 1685 // to be selected. 1686 bool HalvingSwizzle = false; 1687 1688 // This flag determines whether or not CompName has an 's' char prefix, 1689 // indicating that it is a string of hex values to be used as vector indices. 1690 bool HexSwizzle = *compStr == 's'; 1691 1692 // Check that we've found one of the special components, or that the component 1693 // names must come from the same set. 1694 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1695 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1696 HalvingSwizzle = true; 1697 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1698 do 1699 compStr++; 1700 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1701 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1702 do 1703 compStr++; 1704 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1705 } 1706 1707 if (!HalvingSwizzle && *compStr) { 1708 // We didn't get to the end of the string. This means the component names 1709 // didn't come from the same set *or* we encountered an illegal name. 1710 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1711 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1712 return QualType(); 1713 } 1714 1715 // Ensure no component accessor exceeds the width of the vector type it 1716 // operates on. 1717 if (!HalvingSwizzle) { 1718 compStr = CompName.getName(); 1719 1720 if (HexSwizzle) 1721 compStr++; 1722 1723 while (*compStr) { 1724 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1725 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1726 << baseType << SourceRange(CompLoc); 1727 return QualType(); 1728 } 1729 } 1730 } 1731 1732 // If this is a halving swizzle, verify that the base type has an even 1733 // number of elements. 1734 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1735 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1736 << baseType << SourceRange(CompLoc); 1737 return QualType(); 1738 } 1739 1740 // The component accessor looks fine - now we need to compute the actual type. 1741 // The vector type is implied by the component accessor. For example, 1742 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1743 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1744 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1745 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1746 : CompName.getLength(); 1747 if (HexSwizzle) 1748 CompSize--; 1749 1750 if (CompSize == 1) 1751 return vecType->getElementType(); 1752 1753 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1754 // Now look up the TypeDefDecl from the vector type. Without this, 1755 // diagostics look bad. We want extended vector types to appear built-in. 1756 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1757 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1758 return Context.getTypedefType(ExtVectorDecls[i]); 1759 } 1760 return VT; // should never get here (a typedef type should always be found). 1761} 1762 1763static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1764 IdentifierInfo &Member, 1765 const Selector &Sel, 1766 ASTContext &Context) { 1767 1768 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(Context, &Member)) 1769 return PD; 1770 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Context, Sel)) 1771 return OMD; 1772 1773 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1774 E = PDecl->protocol_end(); I != E; ++I) { 1775 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel, 1776 Context)) 1777 return D; 1778 } 1779 return 0; 1780} 1781 1782static Decl *FindGetterNameDecl(const ObjCQualifiedIdType *QIdTy, 1783 IdentifierInfo &Member, 1784 const Selector &Sel, 1785 ASTContext &Context) { 1786 // Check protocols on qualified interfaces. 1787 Decl *GDecl = 0; 1788 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1789 E = QIdTy->qual_end(); I != E; ++I) { 1790 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, &Member)) { 1791 GDecl = PD; 1792 break; 1793 } 1794 // Also must look for a getter name which uses property syntax. 1795 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Context, Sel)) { 1796 GDecl = OMD; 1797 break; 1798 } 1799 } 1800 if (!GDecl) { 1801 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1802 E = QIdTy->qual_end(); I != E; ++I) { 1803 // Search in the protocol-qualifier list of current protocol. 1804 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel, Context); 1805 if (GDecl) 1806 return GDecl; 1807 } 1808 } 1809 return GDecl; 1810} 1811 1812/// FindMethodInNestedImplementations - Look up a method in current and 1813/// all base class implementations. 1814/// 1815ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 1816 const ObjCInterfaceDecl *IFace, 1817 const Selector &Sel) { 1818 ObjCMethodDecl *Method = 0; 1819 if (ObjCImplementationDecl *ImpDecl 1820 = LookupObjCImplementation(IFace->getIdentifier())) 1821 Method = ImpDecl->getInstanceMethod(Context, Sel); 1822 1823 if (!Method && IFace->getSuperClass()) 1824 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 1825 return Method; 1826} 1827 1828Action::OwningExprResult 1829Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1830 tok::TokenKind OpKind, SourceLocation MemberLoc, 1831 IdentifierInfo &Member, 1832 DeclPtrTy ObjCImpDecl) { 1833 Expr *BaseExpr = static_cast<Expr *>(Base.release()); 1834 assert(BaseExpr && "no record expression"); 1835 1836 // Perform default conversions. 1837 DefaultFunctionArrayConversion(BaseExpr); 1838 1839 QualType BaseType = BaseExpr->getType(); 1840 assert(!BaseType.isNull() && "no type for member expression"); 1841 1842 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1843 // must have pointer type, and the accessed type is the pointee. 1844 if (OpKind == tok::arrow) { 1845 if (const PointerType *PT = BaseType->getAsPointerType()) 1846 BaseType = PT->getPointeeType(); 1847 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1848 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1849 MemberLoc, Member)); 1850 else 1851 return ExprError(Diag(MemberLoc, 1852 diag::err_typecheck_member_reference_arrow) 1853 << BaseType << BaseExpr->getSourceRange()); 1854 } 1855 1856 // Handle field access to simple records. This also handles access to fields 1857 // of the ObjC 'id' struct. 1858 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1859 RecordDecl *RDecl = RTy->getDecl(); 1860 if (RequireCompleteType(OpLoc, BaseType, 1861 diag::err_typecheck_incomplete_tag, 1862 BaseExpr->getSourceRange())) 1863 return ExprError(); 1864 1865 // The record definition is complete, now make sure the member is valid. 1866 // FIXME: Qualified name lookup for C++ is a bit more complicated 1867 // than this. 1868 LookupResult Result 1869 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1870 LookupMemberName, false); 1871 1872 if (!Result) 1873 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1874 << &Member << BaseExpr->getSourceRange()); 1875 if (Result.isAmbiguous()) { 1876 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1877 MemberLoc, BaseExpr->getSourceRange()); 1878 return ExprError(); 1879 } 1880 1881 NamedDecl *MemberDecl = Result; 1882 1883 // If the decl being referenced had an error, return an error for this 1884 // sub-expr without emitting another error, in order to avoid cascading 1885 // error cases. 1886 if (MemberDecl->isInvalidDecl()) 1887 return ExprError(); 1888 1889 // Check the use of this field 1890 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 1891 return ExprError(); 1892 1893 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1894 // We may have found a field within an anonymous union or struct 1895 // (C++ [class.union]). 1896 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1897 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1898 BaseExpr, OpLoc); 1899 1900 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1901 // FIXME: Handle address space modifiers 1902 QualType MemberType = FD->getType(); 1903 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1904 MemberType = Ref->getPointeeType(); 1905 else { 1906 unsigned combinedQualifiers = 1907 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1908 if (FD->isMutable()) 1909 combinedQualifiers &= ~QualType::Const; 1910 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1911 } 1912 1913 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1914 MemberLoc, MemberType)); 1915 } 1916 1917 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) 1918 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1919 Var, MemberLoc, 1920 Var->getType().getNonReferenceType())); 1921 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 1922 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1923 MemberFn, MemberLoc, 1924 MemberFn->getType())); 1925 if (OverloadedFunctionDecl *Ovl 1926 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 1927 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 1928 MemberLoc, Context.OverloadTy)); 1929 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 1930 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1931 Enum, MemberLoc, Enum->getType())); 1932 if (isa<TypeDecl>(MemberDecl)) 1933 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 1934 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1935 1936 // We found a declaration kind that we didn't expect. This is a 1937 // generic error message that tells the user that she can't refer 1938 // to this member with '.' or '->'. 1939 return ExprError(Diag(MemberLoc, 1940 diag::err_typecheck_member_reference_unknown) 1941 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1942 } 1943 1944 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1945 // (*Obj).ivar. 1946 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1947 ObjCInterfaceDecl *ClassDeclared; 1948 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(Context, 1949 &Member, 1950 ClassDeclared)) { 1951 // If the decl being referenced had an error, return an error for this 1952 // sub-expr without emitting another error, in order to avoid cascading 1953 // error cases. 1954 if (IV->isInvalidDecl()) 1955 return ExprError(); 1956 1957 // Check whether we can reference this field. 1958 if (DiagnoseUseOfDecl(IV, MemberLoc)) 1959 return ExprError(); 1960 if (IV->getAccessControl() != ObjCIvarDecl::Public && 1961 IV->getAccessControl() != ObjCIvarDecl::Package) { 1962 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 1963 if (ObjCMethodDecl *MD = getCurMethodDecl()) 1964 ClassOfMethodDecl = MD->getClassInterface(); 1965 else if (ObjCImpDecl && getCurFunctionDecl()) { 1966 // Case of a c-function declared inside an objc implementation. 1967 // FIXME: For a c-style function nested inside an objc implementation 1968 // class, there is no implementation context available, so we pass down 1969 // the context as argument to this routine. Ideally, this context need 1970 // be passed down in the AST node and somehow calculated from the AST 1971 // for a function decl. 1972 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 1973 if (ObjCImplementationDecl *IMPD = 1974 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 1975 ClassOfMethodDecl = IMPD->getClassInterface(); 1976 else if (ObjCCategoryImplDecl* CatImplClass = 1977 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 1978 ClassOfMethodDecl = CatImplClass->getClassInterface(); 1979 } 1980 1981 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 1982 if (ClassDeclared != IFTy->getDecl() || 1983 ClassOfMethodDecl != ClassDeclared) 1984 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 1985 } 1986 // @protected 1987 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 1988 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 1989 } 1990 1991 return Owned(new (Context) ObjCIvarRefExpr(IV, IV->getType(), 1992 MemberLoc, BaseExpr, 1993 OpKind == tok::arrow)); 1994 } 1995 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1996 << IFTy->getDecl()->getDeclName() << &Member 1997 << BaseExpr->getSourceRange()); 1998 } 1999 2000 // Handle Objective-C property access, which is "Obj.property" where Obj is a 2001 // pointer to a (potentially qualified) interface type. 2002 const PointerType *PTy; 2003 const ObjCInterfaceType *IFTy; 2004 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 2005 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 2006 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 2007 2008 // Search for a declared property first. 2009 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Context, 2010 &Member)) { 2011 // Check whether we can reference this property. 2012 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2013 return ExprError(); 2014 2015 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2016 MemberLoc, BaseExpr)); 2017 } 2018 2019 // Check protocols on qualified interfaces. 2020 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 2021 E = IFTy->qual_end(); I != E; ++I) 2022 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Context, 2023 &Member)) { 2024 // Check whether we can reference this property. 2025 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2026 return ExprError(); 2027 2028 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2029 MemberLoc, BaseExpr)); 2030 } 2031 2032 // If that failed, look for an "implicit" property by seeing if the nullary 2033 // selector is implemented. 2034 2035 // FIXME: The logic for looking up nullary and unary selectors should be 2036 // shared with the code in ActOnInstanceMessage. 2037 2038 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2039 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Context, Sel); 2040 2041 // If this reference is in an @implementation, check for 'private' methods. 2042 if (!Getter) 2043 Getter = FindMethodInNestedImplementations(IFace, Sel); 2044 2045 // Look through local category implementations associated with the class. 2046 if (!Getter) { 2047 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 2048 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2049 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Context, Sel); 2050 } 2051 } 2052 if (Getter) { 2053 // Check if we can reference this property. 2054 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2055 return ExprError(); 2056 } 2057 // If we found a getter then this may be a valid dot-reference, we 2058 // will look for the matching setter, in case it is needed. 2059 Selector SetterSel = 2060 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2061 PP.getSelectorTable(), &Member); 2062 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(Context, SetterSel); 2063 if (!Setter) { 2064 // If this reference is in an @implementation, also check for 'private' 2065 // methods. 2066 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2067 } 2068 // Look through local category implementations associated with the class. 2069 if (!Setter) { 2070 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2071 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2072 Setter = ObjCCategoryImpls[i]->getInstanceMethod(Context, SetterSel); 2073 } 2074 } 2075 2076 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2077 return ExprError(); 2078 2079 if (Getter || Setter) { 2080 QualType PType; 2081 2082 if (Getter) 2083 PType = Getter->getResultType(); 2084 else { 2085 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2086 E = Setter->param_end(); PI != E; ++PI) 2087 PType = (*PI)->getType(); 2088 } 2089 // FIXME: we must check that the setter has property type. 2090 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2091 Setter, MemberLoc, BaseExpr)); 2092 } 2093 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2094 << &Member << BaseType); 2095 } 2096 // Handle properties on qualified "id" protocols. 2097 const ObjCQualifiedIdType *QIdTy; 2098 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2099 // Check protocols on qualified interfaces. 2100 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2101 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel, Context)) { 2102 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2103 // Check the use of this declaration 2104 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2105 return ExprError(); 2106 2107 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2108 MemberLoc, BaseExpr)); 2109 } 2110 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2111 // Check the use of this method. 2112 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2113 return ExprError(); 2114 2115 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2116 OMD->getResultType(), 2117 OMD, OpLoc, MemberLoc, 2118 NULL, 0)); 2119 } 2120 } 2121 2122 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2123 << &Member << BaseType); 2124 } 2125 // Handle properties on ObjC 'Class' types. 2126 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2127 // Also must look for a getter name which uses property syntax. 2128 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2129 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2130 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2131 ObjCMethodDecl *Getter; 2132 // FIXME: need to also look locally in the implementation. 2133 if ((Getter = IFace->lookupClassMethod(Context, Sel))) { 2134 // Check the use of this method. 2135 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2136 return ExprError(); 2137 } 2138 // If we found a getter then this may be a valid dot-reference, we 2139 // will look for the matching setter, in case it is needed. 2140 Selector SetterSel = 2141 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2142 PP.getSelectorTable(), &Member); 2143 ObjCMethodDecl *Setter = IFace->lookupClassMethod(Context, SetterSel); 2144 if (!Setter) { 2145 // If this reference is in an @implementation, also check for 'private' 2146 // methods. 2147 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2148 } 2149 // Look through local category implementations associated with the class. 2150 if (!Setter) { 2151 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2152 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2153 Setter = ObjCCategoryImpls[i]->getClassMethod(Context, SetterSel); 2154 } 2155 } 2156 2157 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2158 return ExprError(); 2159 2160 if (Getter || Setter) { 2161 QualType PType; 2162 2163 if (Getter) 2164 PType = Getter->getResultType(); 2165 else { 2166 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2167 E = Setter->param_end(); PI != E; ++PI) 2168 PType = (*PI)->getType(); 2169 } 2170 // FIXME: we must check that the setter has property type. 2171 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2172 Setter, MemberLoc, BaseExpr)); 2173 } 2174 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2175 << &Member << BaseType); 2176 } 2177 } 2178 2179 // Handle 'field access' to vectors, such as 'V.xx'. 2180 if (BaseType->isExtVectorType()) { 2181 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2182 if (ret.isNull()) 2183 return ExprError(); 2184 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2185 MemberLoc)); 2186 } 2187 2188 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2189 << BaseType << BaseExpr->getSourceRange(); 2190 2191 // If the user is trying to apply -> or . to a function or function 2192 // pointer, it's probably because they forgot parentheses to call 2193 // the function. Suggest the addition of those parentheses. 2194 if (BaseType == Context.OverloadTy || 2195 BaseType->isFunctionType() || 2196 (BaseType->isPointerType() && 2197 BaseType->getAsPointerType()->isFunctionType())) { 2198 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2199 Diag(Loc, diag::note_member_reference_needs_call) 2200 << CodeModificationHint::CreateInsertion(Loc, "()"); 2201 } 2202 2203 return ExprError(); 2204} 2205 2206/// ConvertArgumentsForCall - Converts the arguments specified in 2207/// Args/NumArgs to the parameter types of the function FDecl with 2208/// function prototype Proto. Call is the call expression itself, and 2209/// Fn is the function expression. For a C++ member function, this 2210/// routine does not attempt to convert the object argument. Returns 2211/// true if the call is ill-formed. 2212bool 2213Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2214 FunctionDecl *FDecl, 2215 const FunctionProtoType *Proto, 2216 Expr **Args, unsigned NumArgs, 2217 SourceLocation RParenLoc) { 2218 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2219 // assignment, to the types of the corresponding parameter, ... 2220 unsigned NumArgsInProto = Proto->getNumArgs(); 2221 unsigned NumArgsToCheck = NumArgs; 2222 bool Invalid = false; 2223 2224 // If too few arguments are available (and we don't have default 2225 // arguments for the remaining parameters), don't make the call. 2226 if (NumArgs < NumArgsInProto) { 2227 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2228 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2229 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2230 // Use default arguments for missing arguments 2231 NumArgsToCheck = NumArgsInProto; 2232 Call->setNumArgs(Context, NumArgsInProto); 2233 } 2234 2235 // If too many are passed and not variadic, error on the extras and drop 2236 // them. 2237 if (NumArgs > NumArgsInProto) { 2238 if (!Proto->isVariadic()) { 2239 Diag(Args[NumArgsInProto]->getLocStart(), 2240 diag::err_typecheck_call_too_many_args) 2241 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2242 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2243 Args[NumArgs-1]->getLocEnd()); 2244 // This deletes the extra arguments. 2245 Call->setNumArgs(Context, NumArgsInProto); 2246 Invalid = true; 2247 } 2248 NumArgsToCheck = NumArgsInProto; 2249 } 2250 2251 // Continue to check argument types (even if we have too few/many args). 2252 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2253 QualType ProtoArgType = Proto->getArgType(i); 2254 2255 Expr *Arg; 2256 if (i < NumArgs) { 2257 Arg = Args[i]; 2258 2259 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2260 ProtoArgType, 2261 diag::err_call_incomplete_argument, 2262 Arg->getSourceRange())) 2263 return true; 2264 2265 // Pass the argument. 2266 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2267 return true; 2268 } else 2269 // We already type-checked the argument, so we know it works. 2270 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2271 QualType ArgType = Arg->getType(); 2272 2273 Call->setArg(i, Arg); 2274 } 2275 2276 // If this is a variadic call, handle args passed through "...". 2277 if (Proto->isVariadic()) { 2278 VariadicCallType CallType = VariadicFunction; 2279 if (Fn->getType()->isBlockPointerType()) 2280 CallType = VariadicBlock; // Block 2281 else if (isa<MemberExpr>(Fn)) 2282 CallType = VariadicMethod; 2283 2284 // Promote the arguments (C99 6.5.2.2p7). 2285 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2286 Expr *Arg = Args[i]; 2287 Invalid |= DefaultVariadicArgumentPromotion(Arg, CallType); 2288 Call->setArg(i, Arg); 2289 } 2290 } 2291 2292 return Invalid; 2293} 2294 2295/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2296/// This provides the location of the left/right parens and a list of comma 2297/// locations. 2298Action::OwningExprResult 2299Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2300 MultiExprArg args, 2301 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2302 unsigned NumArgs = args.size(); 2303 Expr *Fn = static_cast<Expr *>(fn.release()); 2304 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2305 assert(Fn && "no function call expression"); 2306 FunctionDecl *FDecl = NULL; 2307 DeclarationName UnqualifiedName; 2308 2309 if (getLangOptions().CPlusPlus) { 2310 // Determine whether this is a dependent call inside a C++ template, 2311 // in which case we won't do any semantic analysis now. 2312 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 2313 bool Dependent = false; 2314 if (Fn->isTypeDependent()) 2315 Dependent = true; 2316 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2317 Dependent = true; 2318 2319 if (Dependent) 2320 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2321 Context.DependentTy, RParenLoc)); 2322 2323 // Determine whether this is a call to an object (C++ [over.call.object]). 2324 if (Fn->getType()->isRecordType()) 2325 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2326 CommaLocs, RParenLoc)); 2327 2328 // Determine whether this is a call to a member function. 2329 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2330 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2331 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2332 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2333 CommaLocs, RParenLoc)); 2334 } 2335 2336 // If we're directly calling a function, get the appropriate declaration. 2337 DeclRefExpr *DRExpr = NULL; 2338 Expr *FnExpr = Fn; 2339 bool ADL = true; 2340 while (true) { 2341 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2342 FnExpr = IcExpr->getSubExpr(); 2343 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2344 // Parentheses around a function disable ADL 2345 // (C++0x [basic.lookup.argdep]p1). 2346 ADL = false; 2347 FnExpr = PExpr->getSubExpr(); 2348 } else if (isa<UnaryOperator>(FnExpr) && 2349 cast<UnaryOperator>(FnExpr)->getOpcode() 2350 == UnaryOperator::AddrOf) { 2351 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2352 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2353 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2354 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2355 break; 2356 } else if (UnresolvedFunctionNameExpr *DepName 2357 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2358 UnqualifiedName = DepName->getName(); 2359 break; 2360 } else { 2361 // Any kind of name that does not refer to a declaration (or 2362 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2363 ADL = false; 2364 break; 2365 } 2366 } 2367 2368 OverloadedFunctionDecl *Ovl = 0; 2369 if (DRExpr) { 2370 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2371 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2372 } 2373 2374 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2375 // We don't perform ADL for implicit declarations of builtins. 2376 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2377 ADL = false; 2378 2379 // We don't perform ADL in C. 2380 if (!getLangOptions().CPlusPlus) 2381 ADL = false; 2382 2383 if (Ovl || ADL) { 2384 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2385 UnqualifiedName, LParenLoc, Args, 2386 NumArgs, CommaLocs, RParenLoc, ADL); 2387 if (!FDecl) 2388 return ExprError(); 2389 2390 // Update Fn to refer to the actual function selected. 2391 Expr *NewFn = 0; 2392 if (QualifiedDeclRefExpr *QDRExpr 2393 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2394 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2395 QDRExpr->getLocation(), 2396 false, false, 2397 QDRExpr->getQualifierRange(), 2398 QDRExpr->getQualifier()); 2399 else 2400 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2401 Fn->getSourceRange().getBegin()); 2402 Fn->Destroy(Context); 2403 Fn = NewFn; 2404 } 2405 } 2406 2407 // Promote the function operand. 2408 UsualUnaryConversions(Fn); 2409 2410 // Make the call expr early, before semantic checks. This guarantees cleanup 2411 // of arguments and function on error. 2412 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2413 Args, NumArgs, 2414 Context.BoolTy, 2415 RParenLoc)); 2416 2417 const FunctionType *FuncT; 2418 if (!Fn->getType()->isBlockPointerType()) { 2419 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2420 // have type pointer to function". 2421 const PointerType *PT = Fn->getType()->getAsPointerType(); 2422 if (PT == 0) 2423 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2424 << Fn->getType() << Fn->getSourceRange()); 2425 FuncT = PT->getPointeeType()->getAsFunctionType(); 2426 } else { // This is a block call. 2427 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2428 getAsFunctionType(); 2429 } 2430 if (FuncT == 0) 2431 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2432 << Fn->getType() << Fn->getSourceRange()); 2433 2434 // Check for a valid return type 2435 if (!FuncT->getResultType()->isVoidType() && 2436 RequireCompleteType(Fn->getSourceRange().getBegin(), 2437 FuncT->getResultType(), 2438 diag::err_call_incomplete_return, 2439 TheCall->getSourceRange())) 2440 return ExprError(); 2441 2442 // We know the result type of the call, set it. 2443 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2444 2445 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2446 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2447 RParenLoc)) 2448 return ExprError(); 2449 } else { 2450 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2451 2452 if (FDecl) { 2453 // Check if we have too few/too many template arguments, based 2454 // on our knowledge of the function definition. 2455 const FunctionDecl *Def = 0; 2456 if (FDecl->getBody(Context, Def) && NumArgs != Def->param_size()) 2457 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2458 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2459 } 2460 2461 // Promote the arguments (C99 6.5.2.2p6). 2462 for (unsigned i = 0; i != NumArgs; i++) { 2463 Expr *Arg = Args[i]; 2464 DefaultArgumentPromotion(Arg); 2465 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2466 Arg->getType(), 2467 diag::err_call_incomplete_argument, 2468 Arg->getSourceRange())) 2469 return ExprError(); 2470 TheCall->setArg(i, Arg); 2471 } 2472 } 2473 2474 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2475 if (!Method->isStatic()) 2476 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2477 << Fn->getSourceRange()); 2478 2479 // Do special checking on direct calls to functions. 2480 if (FDecl) 2481 return CheckFunctionCall(FDecl, TheCall.take()); 2482 2483 return Owned(TheCall.take()); 2484} 2485 2486Action::OwningExprResult 2487Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2488 SourceLocation RParenLoc, ExprArg InitExpr) { 2489 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2490 QualType literalType = QualType::getFromOpaquePtr(Ty); 2491 // FIXME: put back this assert when initializers are worked out. 2492 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2493 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2494 2495 if (literalType->isArrayType()) { 2496 if (literalType->isVariableArrayType()) 2497 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2498 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2499 } else if (RequireCompleteType(LParenLoc, literalType, 2500 diag::err_typecheck_decl_incomplete_type, 2501 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2502 return ExprError(); 2503 2504 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2505 DeclarationName(), /*FIXME:DirectInit=*/false)) 2506 return ExprError(); 2507 2508 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2509 if (isFileScope) { // 6.5.2.5p3 2510 if (CheckForConstantInitializer(literalExpr, literalType)) 2511 return ExprError(); 2512 } 2513 InitExpr.release(); 2514 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2515 literalExpr, isFileScope)); 2516} 2517 2518Action::OwningExprResult 2519Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2520 SourceLocation RBraceLoc) { 2521 unsigned NumInit = initlist.size(); 2522 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2523 2524 // Semantic analysis for initializers is done by ActOnDeclarator() and 2525 // CheckInitializer() - it requires knowledge of the object being intialized. 2526 2527 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2528 RBraceLoc); 2529 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2530 return Owned(E); 2531} 2532 2533/// CheckCastTypes - Check type constraints for casting between types. 2534bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2535 UsualUnaryConversions(castExpr); 2536 2537 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2538 // type needs to be scalar. 2539 if (castType->isVoidType()) { 2540 // Cast to void allows any expr type. 2541 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2542 // We can't check any more until template instantiation time. 2543 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2544 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2545 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2546 (castType->isStructureType() || castType->isUnionType())) { 2547 // GCC struct/union extension: allow cast to self. 2548 // FIXME: Check that the cast destination type is complete. 2549 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2550 << castType << castExpr->getSourceRange(); 2551 } else if (castType->isUnionType()) { 2552 // GCC cast to union extension 2553 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2554 RecordDecl::field_iterator Field, FieldEnd; 2555 for (Field = RD->field_begin(Context), FieldEnd = RD->field_end(Context); 2556 Field != FieldEnd; ++Field) { 2557 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2558 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2559 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2560 << castExpr->getSourceRange(); 2561 break; 2562 } 2563 } 2564 if (Field == FieldEnd) 2565 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2566 << castExpr->getType() << castExpr->getSourceRange(); 2567 } else { 2568 // Reject any other conversions to non-scalar types. 2569 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2570 << castType << castExpr->getSourceRange(); 2571 } 2572 } else if (!castExpr->getType()->isScalarType() && 2573 !castExpr->getType()->isVectorType()) { 2574 return Diag(castExpr->getLocStart(), 2575 diag::err_typecheck_expect_scalar_operand) 2576 << castExpr->getType() << castExpr->getSourceRange(); 2577 } else if (castExpr->getType()->isVectorType()) { 2578 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2579 return true; 2580 } else if (castType->isVectorType()) { 2581 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2582 return true; 2583 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2584 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2585 } 2586 return false; 2587} 2588 2589bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2590 assert(VectorTy->isVectorType() && "Not a vector type!"); 2591 2592 if (Ty->isVectorType() || Ty->isIntegerType()) { 2593 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2594 return Diag(R.getBegin(), 2595 Ty->isVectorType() ? 2596 diag::err_invalid_conversion_between_vectors : 2597 diag::err_invalid_conversion_between_vector_and_integer) 2598 << VectorTy << Ty << R; 2599 } else 2600 return Diag(R.getBegin(), 2601 diag::err_invalid_conversion_between_vector_and_scalar) 2602 << VectorTy << Ty << R; 2603 2604 return false; 2605} 2606 2607Action::OwningExprResult 2608Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2609 SourceLocation RParenLoc, ExprArg Op) { 2610 assert((Ty != 0) && (Op.get() != 0) && 2611 "ActOnCastExpr(): missing type or expr"); 2612 2613 Expr *castExpr = static_cast<Expr*>(Op.release()); 2614 QualType castType = QualType::getFromOpaquePtr(Ty); 2615 2616 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2617 return ExprError(); 2618 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2619 LParenLoc, RParenLoc)); 2620} 2621 2622/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2623/// In that case, lhs = cond. 2624/// C99 6.5.15 2625QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2626 SourceLocation QuestionLoc) { 2627 // C++ is sufficiently different to merit its own checker. 2628 if (getLangOptions().CPlusPlus) 2629 return CXXCheckConditionalOperands(Cond, LHS, RHS, QuestionLoc); 2630 2631 UsualUnaryConversions(Cond); 2632 UsualUnaryConversions(LHS); 2633 UsualUnaryConversions(RHS); 2634 QualType CondTy = Cond->getType(); 2635 QualType LHSTy = LHS->getType(); 2636 QualType RHSTy = RHS->getType(); 2637 2638 // first, check the condition. 2639 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2640 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2641 << CondTy; 2642 return QualType(); 2643 } 2644 2645 // Now check the two expressions. 2646 2647 // If both operands have arithmetic type, do the usual arithmetic conversions 2648 // to find a common type: C99 6.5.15p3,5. 2649 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2650 UsualArithmeticConversions(LHS, RHS); 2651 return LHS->getType(); 2652 } 2653 2654 // If both operands are the same structure or union type, the result is that 2655 // type. 2656 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2657 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2658 if (LHSRT->getDecl() == RHSRT->getDecl()) 2659 // "If both the operands have structure or union type, the result has 2660 // that type." This implies that CV qualifiers are dropped. 2661 return LHSTy.getUnqualifiedType(); 2662 // FIXME: Type of conditional expression must be complete in C mode. 2663 } 2664 2665 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2666 // The following || allows only one side to be void (a GCC-ism). 2667 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2668 if (!LHSTy->isVoidType()) 2669 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2670 << RHS->getSourceRange(); 2671 if (!RHSTy->isVoidType()) 2672 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2673 << LHS->getSourceRange(); 2674 ImpCastExprToType(LHS, Context.VoidTy); 2675 ImpCastExprToType(RHS, Context.VoidTy); 2676 return Context.VoidTy; 2677 } 2678 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2679 // the type of the other operand." 2680 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2681 Context.isObjCObjectPointerType(LHSTy)) && 2682 RHS->isNullPointerConstant(Context)) { 2683 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2684 return LHSTy; 2685 } 2686 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2687 Context.isObjCObjectPointerType(RHSTy)) && 2688 LHS->isNullPointerConstant(Context)) { 2689 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2690 return RHSTy; 2691 } 2692 2693 // Handle the case where both operands are pointers before we handle null 2694 // pointer constants in case both operands are null pointer constants. 2695 if (const PointerType *LHSPT = LHSTy->getAsPointerType()) { // C99 6.5.15p3,6 2696 if (const PointerType *RHSPT = RHSTy->getAsPointerType()) { 2697 // get the "pointed to" types 2698 QualType lhptee = LHSPT->getPointeeType(); 2699 QualType rhptee = RHSPT->getPointeeType(); 2700 2701 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2702 if (lhptee->isVoidType() && 2703 rhptee->isIncompleteOrObjectType()) { 2704 // Figure out necessary qualifiers (C99 6.5.15p6) 2705 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2706 QualType destType = Context.getPointerType(destPointee); 2707 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2708 ImpCastExprToType(RHS, destType); // promote to void* 2709 return destType; 2710 } 2711 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2712 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2713 QualType destType = Context.getPointerType(destPointee); 2714 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2715 ImpCastExprToType(RHS, destType); // promote to void* 2716 return destType; 2717 } 2718 2719 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2720 // Two identical pointer types are always compatible. 2721 return LHSTy; 2722 } 2723 2724 QualType compositeType = LHSTy; 2725 2726 // If either type is an Objective-C object type then check 2727 // compatibility according to Objective-C. 2728 if (Context.isObjCObjectPointerType(LHSTy) || 2729 Context.isObjCObjectPointerType(RHSTy)) { 2730 // If both operands are interfaces and either operand can be 2731 // assigned to the other, use that type as the composite 2732 // type. This allows 2733 // xxx ? (A*) a : (B*) b 2734 // where B is a subclass of A. 2735 // 2736 // Additionally, as for assignment, if either type is 'id' 2737 // allow silent coercion. Finally, if the types are 2738 // incompatible then make sure to use 'id' as the composite 2739 // type so the result is acceptable for sending messages to. 2740 2741 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2742 // It could return the composite type. 2743 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2744 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2745 if (LHSIface && RHSIface && 2746 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2747 compositeType = LHSTy; 2748 } else if (LHSIface && RHSIface && 2749 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2750 compositeType = RHSTy; 2751 } else if (Context.isObjCIdStructType(lhptee) || 2752 Context.isObjCIdStructType(rhptee)) { 2753 compositeType = Context.getObjCIdType(); 2754 } else { 2755 Diag(QuestionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2756 << LHSTy << RHSTy 2757 << LHS->getSourceRange() << RHS->getSourceRange(); 2758 QualType incompatTy = Context.getObjCIdType(); 2759 ImpCastExprToType(LHS, incompatTy); 2760 ImpCastExprToType(RHS, incompatTy); 2761 return incompatTy; 2762 } 2763 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2764 rhptee.getUnqualifiedType())) { 2765 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2766 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2767 // In this situation, we assume void* type. No especially good 2768 // reason, but this is what gcc does, and we do have to pick 2769 // to get a consistent AST. 2770 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2771 ImpCastExprToType(LHS, incompatTy); 2772 ImpCastExprToType(RHS, incompatTy); 2773 return incompatTy; 2774 } 2775 // The pointer types are compatible. 2776 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2777 // differently qualified versions of compatible types, the result type is 2778 // a pointer to an appropriately qualified version of the *composite* 2779 // type. 2780 // FIXME: Need to calculate the composite type. 2781 // FIXME: Need to add qualifiers 2782 ImpCastExprToType(LHS, compositeType); 2783 ImpCastExprToType(RHS, compositeType); 2784 return compositeType; 2785 } 2786 } 2787 2788 // GCC compatibility: soften pointer/integer mismatch. 2789 if (RHSTy->isPointerType() && LHSTy->isIntegerType()) { 2790 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 2791 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2792 ImpCastExprToType(LHS, RHSTy); // promote the integer to a pointer. 2793 return RHSTy; 2794 } 2795 if (LHSTy->isPointerType() && RHSTy->isIntegerType()) { 2796 Diag(QuestionLoc, diag::warn_typecheck_cond_pointer_integer_mismatch) 2797 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2798 ImpCastExprToType(RHS, LHSTy); // promote the integer to a pointer. 2799 return LHSTy; 2800 } 2801 2802 // Selection between block pointer types is ok as long as they are the same. 2803 if (LHSTy->isBlockPointerType() && RHSTy->isBlockPointerType() && 2804 Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) 2805 return LHSTy; 2806 2807 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2808 // evaluates to "struct objc_object *" (and is handled above when comparing 2809 // id with statically typed objects). 2810 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 2811 // GCC allows qualified id and any Objective-C type to devolve to 2812 // id. Currently localizing to here until clear this should be 2813 // part of ObjCQualifiedIdTypesAreCompatible. 2814 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 2815 (LHSTy->isObjCQualifiedIdType() && 2816 Context.isObjCObjectPointerType(RHSTy)) || 2817 (RHSTy->isObjCQualifiedIdType() && 2818 Context.isObjCObjectPointerType(LHSTy))) { 2819 // FIXME: This is not the correct composite type. This only 2820 // happens to work because id can more or less be used anywhere, 2821 // however this may change the type of method sends. 2822 // FIXME: gcc adds some type-checking of the arguments and emits 2823 // (confusing) incompatible comparison warnings in some 2824 // cases. Investigate. 2825 QualType compositeType = Context.getObjCIdType(); 2826 ImpCastExprToType(LHS, compositeType); 2827 ImpCastExprToType(RHS, compositeType); 2828 return compositeType; 2829 } 2830 } 2831 2832 // Otherwise, the operands are not compatible. 2833 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2834 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2835 return QualType(); 2836} 2837 2838/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2839/// in the case of a the GNU conditional expr extension. 2840Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2841 SourceLocation ColonLoc, 2842 ExprArg Cond, ExprArg LHS, 2843 ExprArg RHS) { 2844 Expr *CondExpr = (Expr *) Cond.get(); 2845 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2846 2847 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2848 // was the condition. 2849 bool isLHSNull = LHSExpr == 0; 2850 if (isLHSNull) 2851 LHSExpr = CondExpr; 2852 2853 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2854 RHSExpr, QuestionLoc); 2855 if (result.isNull()) 2856 return ExprError(); 2857 2858 Cond.release(); 2859 LHS.release(); 2860 RHS.release(); 2861 return Owned(new (Context) ConditionalOperator(CondExpr, 2862 isLHSNull ? 0 : LHSExpr, 2863 RHSExpr, result)); 2864} 2865 2866 2867// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2868// being closely modeled after the C99 spec:-). The odd characteristic of this 2869// routine is it effectively iqnores the qualifiers on the top level pointee. 2870// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2871// FIXME: add a couple examples in this comment. 2872Sema::AssignConvertType 2873Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2874 QualType lhptee, rhptee; 2875 2876 // get the "pointed to" type (ignoring qualifiers at the top level) 2877 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2878 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2879 2880 // make sure we operate on the canonical type 2881 lhptee = Context.getCanonicalType(lhptee); 2882 rhptee = Context.getCanonicalType(rhptee); 2883 2884 AssignConvertType ConvTy = Compatible; 2885 2886 // C99 6.5.16.1p1: This following citation is common to constraints 2887 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2888 // qualifiers of the type *pointed to* by the right; 2889 // FIXME: Handle ExtQualType 2890 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2891 ConvTy = CompatiblePointerDiscardsQualifiers; 2892 2893 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2894 // incomplete type and the other is a pointer to a qualified or unqualified 2895 // version of void... 2896 if (lhptee->isVoidType()) { 2897 if (rhptee->isIncompleteOrObjectType()) 2898 return ConvTy; 2899 2900 // As an extension, we allow cast to/from void* to function pointer. 2901 assert(rhptee->isFunctionType()); 2902 return FunctionVoidPointer; 2903 } 2904 2905 if (rhptee->isVoidType()) { 2906 if (lhptee->isIncompleteOrObjectType()) 2907 return ConvTy; 2908 2909 // As an extension, we allow cast to/from void* to function pointer. 2910 assert(lhptee->isFunctionType()); 2911 return FunctionVoidPointer; 2912 } 2913 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2914 // unqualified versions of compatible types, ... 2915 lhptee = lhptee.getUnqualifiedType(); 2916 rhptee = rhptee.getUnqualifiedType(); 2917 if (!Context.typesAreCompatible(lhptee, rhptee)) { 2918 // Check if the pointee types are compatible ignoring the sign. 2919 // We explicitly check for char so that we catch "char" vs 2920 // "unsigned char" on systems where "char" is unsigned. 2921 if (lhptee->isCharType()) { 2922 lhptee = Context.UnsignedCharTy; 2923 } else if (lhptee->isSignedIntegerType()) { 2924 lhptee = Context.getCorrespondingUnsignedType(lhptee); 2925 } 2926 if (rhptee->isCharType()) { 2927 rhptee = Context.UnsignedCharTy; 2928 } else if (rhptee->isSignedIntegerType()) { 2929 rhptee = Context.getCorrespondingUnsignedType(rhptee); 2930 } 2931 if (lhptee == rhptee) { 2932 // Types are compatible ignoring the sign. Qualifier incompatibility 2933 // takes priority over sign incompatibility because the sign 2934 // warning can be disabled. 2935 if (ConvTy != Compatible) 2936 return ConvTy; 2937 return IncompatiblePointerSign; 2938 } 2939 // General pointer incompatibility takes priority over qualifiers. 2940 return IncompatiblePointer; 2941 } 2942 return ConvTy; 2943} 2944 2945/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2946/// block pointer types are compatible or whether a block and normal pointer 2947/// are compatible. It is more restrict than comparing two function pointer 2948// types. 2949Sema::AssignConvertType 2950Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2951 QualType rhsType) { 2952 QualType lhptee, rhptee; 2953 2954 // get the "pointed to" type (ignoring qualifiers at the top level) 2955 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2956 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2957 2958 // make sure we operate on the canonical type 2959 lhptee = Context.getCanonicalType(lhptee); 2960 rhptee = Context.getCanonicalType(rhptee); 2961 2962 AssignConvertType ConvTy = Compatible; 2963 2964 // For blocks we enforce that qualifiers are identical. 2965 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2966 ConvTy = CompatiblePointerDiscardsQualifiers; 2967 2968 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2969 return IncompatibleBlockPointer; 2970 return ConvTy; 2971} 2972 2973/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2974/// has code to accommodate several GCC extensions when type checking 2975/// pointers. Here are some objectionable examples that GCC considers warnings: 2976/// 2977/// int a, *pint; 2978/// short *pshort; 2979/// struct foo *pfoo; 2980/// 2981/// pint = pshort; // warning: assignment from incompatible pointer type 2982/// a = pint; // warning: assignment makes integer from pointer without a cast 2983/// pint = a; // warning: assignment makes pointer from integer without a cast 2984/// pint = pfoo; // warning: assignment from incompatible pointer type 2985/// 2986/// As a result, the code for dealing with pointers is more complex than the 2987/// C99 spec dictates. 2988/// 2989Sema::AssignConvertType 2990Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2991 // Get canonical types. We're not formatting these types, just comparing 2992 // them. 2993 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2994 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2995 2996 if (lhsType == rhsType) 2997 return Compatible; // Common case: fast path an exact match. 2998 2999 // If the left-hand side is a reference type, then we are in a 3000 // (rare!) case where we've allowed the use of references in C, 3001 // e.g., as a parameter type in a built-in function. In this case, 3002 // just make sure that the type referenced is compatible with the 3003 // right-hand side type. The caller is responsible for adjusting 3004 // lhsType so that the resulting expression does not have reference 3005 // type. 3006 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 3007 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 3008 return Compatible; 3009 return Incompatible; 3010 } 3011 3012 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 3013 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 3014 return Compatible; 3015 // Relax integer conversions like we do for pointers below. 3016 if (rhsType->isIntegerType()) 3017 return IntToPointer; 3018 if (lhsType->isIntegerType()) 3019 return PointerToInt; 3020 return IncompatibleObjCQualifiedId; 3021 } 3022 3023 if (lhsType->isVectorType() || rhsType->isVectorType()) { 3024 // For ExtVector, allow vector splats; float -> <n x float> 3025 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 3026 if (LV->getElementType() == rhsType) 3027 return Compatible; 3028 3029 // If we are allowing lax vector conversions, and LHS and RHS are both 3030 // vectors, the total size only needs to be the same. This is a bitcast; 3031 // no bits are changed but the result type is different. 3032 if (getLangOptions().LaxVectorConversions && 3033 lhsType->isVectorType() && rhsType->isVectorType()) { 3034 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 3035 return IncompatibleVectors; 3036 } 3037 return Incompatible; 3038 } 3039 3040 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 3041 return Compatible; 3042 3043 if (isa<PointerType>(lhsType)) { 3044 if (rhsType->isIntegerType()) 3045 return IntToPointer; 3046 3047 if (isa<PointerType>(rhsType)) 3048 return CheckPointerTypesForAssignment(lhsType, rhsType); 3049 3050 if (rhsType->getAsBlockPointerType()) { 3051 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3052 return Compatible; 3053 3054 // Treat block pointers as objects. 3055 if (getLangOptions().ObjC1 && 3056 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 3057 return Compatible; 3058 } 3059 return Incompatible; 3060 } 3061 3062 if (isa<BlockPointerType>(lhsType)) { 3063 if (rhsType->isIntegerType()) 3064 return IntToBlockPointer; 3065 3066 // Treat block pointers as objects. 3067 if (getLangOptions().ObjC1 && 3068 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 3069 return Compatible; 3070 3071 if (rhsType->isBlockPointerType()) 3072 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 3073 3074 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 3075 if (RHSPT->getPointeeType()->isVoidType()) 3076 return Compatible; 3077 } 3078 return Incompatible; 3079 } 3080 3081 if (isa<PointerType>(rhsType)) { 3082 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 3083 if (lhsType == Context.BoolTy) 3084 return Compatible; 3085 3086 if (lhsType->isIntegerType()) 3087 return PointerToInt; 3088 3089 if (isa<PointerType>(lhsType)) 3090 return CheckPointerTypesForAssignment(lhsType, rhsType); 3091 3092 if (isa<BlockPointerType>(lhsType) && 3093 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3094 return Compatible; 3095 return Incompatible; 3096 } 3097 3098 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3099 if (Context.typesAreCompatible(lhsType, rhsType)) 3100 return Compatible; 3101 } 3102 return Incompatible; 3103} 3104 3105Sema::AssignConvertType 3106Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3107 if (getLangOptions().CPlusPlus) { 3108 if (!lhsType->isRecordType()) { 3109 // C++ 5.17p3: If the left operand is not of class type, the 3110 // expression is implicitly converted (C++ 4) to the 3111 // cv-unqualified type of the left operand. 3112 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3113 "assigning")) 3114 return Incompatible; 3115 return Compatible; 3116 } 3117 3118 // FIXME: Currently, we fall through and treat C++ classes like C 3119 // structures. 3120 } 3121 3122 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3123 // a null pointer constant. 3124 if ((lhsType->isPointerType() || 3125 lhsType->isObjCQualifiedIdType() || 3126 lhsType->isBlockPointerType()) 3127 && rExpr->isNullPointerConstant(Context)) { 3128 ImpCastExprToType(rExpr, lhsType); 3129 return Compatible; 3130 } 3131 3132 // This check seems unnatural, however it is necessary to ensure the proper 3133 // conversion of functions/arrays. If the conversion were done for all 3134 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3135 // expressions that surpress this implicit conversion (&, sizeof). 3136 // 3137 // Suppress this for references: C++ 8.5.3p5. 3138 if (!lhsType->isReferenceType()) 3139 DefaultFunctionArrayConversion(rExpr); 3140 3141 Sema::AssignConvertType result = 3142 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3143 3144 // C99 6.5.16.1p2: The value of the right operand is converted to the 3145 // type of the assignment expression. 3146 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3147 // so that we can use references in built-in functions even in C. 3148 // The getNonReferenceType() call makes sure that the resulting expression 3149 // does not have reference type. 3150 if (rExpr->getType() != lhsType) 3151 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3152 return result; 3153} 3154 3155Sema::AssignConvertType 3156Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 3157 return CheckAssignmentConstraints(lhsType, rhsType); 3158} 3159 3160QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3161 Diag(Loc, diag::err_typecheck_invalid_operands) 3162 << lex->getType() << rex->getType() 3163 << lex->getSourceRange() << rex->getSourceRange(); 3164 return QualType(); 3165} 3166 3167inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3168 Expr *&rex) { 3169 // For conversion purposes, we ignore any qualifiers. 3170 // For example, "const float" and "float" are equivalent. 3171 QualType lhsType = 3172 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3173 QualType rhsType = 3174 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3175 3176 // If the vector types are identical, return. 3177 if (lhsType == rhsType) 3178 return lhsType; 3179 3180 // Handle the case of a vector & extvector type of the same size and element 3181 // type. It would be nice if we only had one vector type someday. 3182 if (getLangOptions().LaxVectorConversions) { 3183 // FIXME: Should we warn here? 3184 if (const VectorType *LV = lhsType->getAsVectorType()) { 3185 if (const VectorType *RV = rhsType->getAsVectorType()) 3186 if (LV->getElementType() == RV->getElementType() && 3187 LV->getNumElements() == RV->getNumElements()) { 3188 return lhsType->isExtVectorType() ? lhsType : rhsType; 3189 } 3190 } 3191 } 3192 3193 // If the lhs is an extended vector and the rhs is a scalar of the same type 3194 // or a literal, promote the rhs to the vector type. 3195 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3196 QualType eltType = V->getElementType(); 3197 3198 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3199 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3200 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3201 ImpCastExprToType(rex, lhsType); 3202 return lhsType; 3203 } 3204 } 3205 3206 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3207 // promote the lhs to the vector type. 3208 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3209 QualType eltType = V->getElementType(); 3210 3211 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3212 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3213 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3214 ImpCastExprToType(lex, rhsType); 3215 return rhsType; 3216 } 3217 } 3218 3219 // You cannot convert between vector values of different size. 3220 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3221 << lex->getType() << rex->getType() 3222 << lex->getSourceRange() << rex->getSourceRange(); 3223 return QualType(); 3224} 3225 3226inline QualType Sema::CheckMultiplyDivideOperands( 3227 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3228{ 3229 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3230 return CheckVectorOperands(Loc, lex, rex); 3231 3232 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3233 3234 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3235 return compType; 3236 return InvalidOperands(Loc, lex, rex); 3237} 3238 3239inline QualType Sema::CheckRemainderOperands( 3240 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3241{ 3242 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3243 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3244 return CheckVectorOperands(Loc, lex, rex); 3245 return InvalidOperands(Loc, lex, rex); 3246 } 3247 3248 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3249 3250 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3251 return compType; 3252 return InvalidOperands(Loc, lex, rex); 3253} 3254 3255inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3256 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3257{ 3258 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3259 QualType compType = CheckVectorOperands(Loc, lex, rex); 3260 if (CompLHSTy) *CompLHSTy = compType; 3261 return compType; 3262 } 3263 3264 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3265 3266 // handle the common case first (both operands are arithmetic). 3267 if (lex->getType()->isArithmeticType() && 3268 rex->getType()->isArithmeticType()) { 3269 if (CompLHSTy) *CompLHSTy = compType; 3270 return compType; 3271 } 3272 3273 // Put any potential pointer into PExp 3274 Expr* PExp = lex, *IExp = rex; 3275 if (IExp->getType()->isPointerType()) 3276 std::swap(PExp, IExp); 3277 3278 if (const PointerType *PTy = PExp->getType()->getAsPointerType()) { 3279 if (IExp->getType()->isIntegerType()) { 3280 QualType PointeeTy = PTy->getPointeeType(); 3281 // Check for arithmetic on pointers to incomplete types. 3282 if (PointeeTy->isVoidType()) { 3283 if (getLangOptions().CPlusPlus) { 3284 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3285 << lex->getSourceRange() << rex->getSourceRange(); 3286 return QualType(); 3287 } 3288 3289 // GNU extension: arithmetic on pointer to void 3290 Diag(Loc, diag::ext_gnu_void_ptr) 3291 << lex->getSourceRange() << rex->getSourceRange(); 3292 } else if (PointeeTy->isFunctionType()) { 3293 if (getLangOptions().CPlusPlus) { 3294 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3295 << lex->getType() << lex->getSourceRange(); 3296 return QualType(); 3297 } 3298 3299 // GNU extension: arithmetic on pointer to function 3300 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3301 << lex->getType() << lex->getSourceRange(); 3302 } else if (!PTy->isDependentType() && 3303 RequireCompleteType(Loc, PointeeTy, 3304 diag::err_typecheck_arithmetic_incomplete_type, 3305 PExp->getSourceRange(), SourceRange(), 3306 PExp->getType())) 3307 return QualType(); 3308 3309 // Diagnose bad cases where we step over interface counts. 3310 if (PointeeTy->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3311 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3312 << PointeeTy << PExp->getSourceRange(); 3313 return QualType(); 3314 } 3315 3316 if (CompLHSTy) { 3317 QualType LHSTy = lex->getType(); 3318 if (LHSTy->isPromotableIntegerType()) 3319 LHSTy = Context.IntTy; 3320 *CompLHSTy = LHSTy; 3321 } 3322 return PExp->getType(); 3323 } 3324 } 3325 3326 return InvalidOperands(Loc, lex, rex); 3327} 3328 3329// C99 6.5.6 3330QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3331 SourceLocation Loc, QualType* CompLHSTy) { 3332 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3333 QualType compType = CheckVectorOperands(Loc, lex, rex); 3334 if (CompLHSTy) *CompLHSTy = compType; 3335 return compType; 3336 } 3337 3338 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3339 3340 // Enforce type constraints: C99 6.5.6p3. 3341 3342 // Handle the common case first (both operands are arithmetic). 3343 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) { 3344 if (CompLHSTy) *CompLHSTy = compType; 3345 return compType; 3346 } 3347 3348 // Either ptr - int or ptr - ptr. 3349 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3350 QualType lpointee = LHSPTy->getPointeeType(); 3351 3352 // The LHS must be an completely-defined object type. 3353 3354 bool ComplainAboutVoid = false; 3355 Expr *ComplainAboutFunc = 0; 3356 if (lpointee->isVoidType()) { 3357 if (getLangOptions().CPlusPlus) { 3358 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3359 << lex->getSourceRange() << rex->getSourceRange(); 3360 return QualType(); 3361 } 3362 3363 // GNU C extension: arithmetic on pointer to void 3364 ComplainAboutVoid = true; 3365 } else if (lpointee->isFunctionType()) { 3366 if (getLangOptions().CPlusPlus) { 3367 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3368 << lex->getType() << lex->getSourceRange(); 3369 return QualType(); 3370 } 3371 3372 // GNU C extension: arithmetic on pointer to function 3373 ComplainAboutFunc = lex; 3374 } else if (!lpointee->isDependentType() && 3375 RequireCompleteType(Loc, lpointee, 3376 diag::err_typecheck_sub_ptr_object, 3377 lex->getSourceRange(), 3378 SourceRange(), 3379 lex->getType())) 3380 return QualType(); 3381 3382 // Diagnose bad cases where we step over interface counts. 3383 if (lpointee->isObjCInterfaceType() && LangOpts.ObjCNonFragileABI) { 3384 Diag(Loc, diag::err_arithmetic_nonfragile_interface) 3385 << lpointee << lex->getSourceRange(); 3386 return QualType(); 3387 } 3388 3389 // The result type of a pointer-int computation is the pointer type. 3390 if (rex->getType()->isIntegerType()) { 3391 if (ComplainAboutVoid) 3392 Diag(Loc, diag::ext_gnu_void_ptr) 3393 << lex->getSourceRange() << rex->getSourceRange(); 3394 if (ComplainAboutFunc) 3395 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3396 << ComplainAboutFunc->getType() 3397 << ComplainAboutFunc->getSourceRange(); 3398 3399 if (CompLHSTy) *CompLHSTy = lex->getType(); 3400 return lex->getType(); 3401 } 3402 3403 // Handle pointer-pointer subtractions. 3404 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3405 QualType rpointee = RHSPTy->getPointeeType(); 3406 3407 // RHS must be a completely-type object type. 3408 // Handle the GNU void* extension. 3409 if (rpointee->isVoidType()) { 3410 if (getLangOptions().CPlusPlus) { 3411 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3412 << lex->getSourceRange() << rex->getSourceRange(); 3413 return QualType(); 3414 } 3415 3416 ComplainAboutVoid = true; 3417 } else if (rpointee->isFunctionType()) { 3418 if (getLangOptions().CPlusPlus) { 3419 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3420 << rex->getType() << rex->getSourceRange(); 3421 return QualType(); 3422 } 3423 3424 // GNU extension: arithmetic on pointer to function 3425 if (!ComplainAboutFunc) 3426 ComplainAboutFunc = rex; 3427 } else if (!rpointee->isDependentType() && 3428 RequireCompleteType(Loc, rpointee, 3429 diag::err_typecheck_sub_ptr_object, 3430 rex->getSourceRange(), 3431 SourceRange(), 3432 rex->getType())) 3433 return QualType(); 3434 3435 // Pointee types must be compatible. 3436 if (!Context.typesAreCompatible( 3437 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3438 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3439 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3440 << lex->getType() << rex->getType() 3441 << lex->getSourceRange() << rex->getSourceRange(); 3442 return QualType(); 3443 } 3444 3445 if (ComplainAboutVoid) 3446 Diag(Loc, diag::ext_gnu_void_ptr) 3447 << lex->getSourceRange() << rex->getSourceRange(); 3448 if (ComplainAboutFunc) 3449 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3450 << ComplainAboutFunc->getType() 3451 << ComplainAboutFunc->getSourceRange(); 3452 3453 if (CompLHSTy) *CompLHSTy = lex->getType(); 3454 return Context.getPointerDiffType(); 3455 } 3456 } 3457 3458 return InvalidOperands(Loc, lex, rex); 3459} 3460 3461// C99 6.5.7 3462QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3463 bool isCompAssign) { 3464 // C99 6.5.7p2: Each of the operands shall have integer type. 3465 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3466 return InvalidOperands(Loc, lex, rex); 3467 3468 // Shifts don't perform usual arithmetic conversions, they just do integer 3469 // promotions on each operand. C99 6.5.7p3 3470 QualType LHSTy; 3471 if (lex->getType()->isPromotableIntegerType()) 3472 LHSTy = Context.IntTy; 3473 else 3474 LHSTy = lex->getType(); 3475 if (!isCompAssign) 3476 ImpCastExprToType(lex, LHSTy); 3477 3478 UsualUnaryConversions(rex); 3479 3480 // "The type of the result is that of the promoted left operand." 3481 return LHSTy; 3482} 3483 3484// C99 6.5.8 3485QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3486 unsigned OpaqueOpc, bool isRelational) { 3487 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 3488 3489 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3490 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3491 3492 // C99 6.5.8p3 / C99 6.5.9p4 3493 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3494 UsualArithmeticConversions(lex, rex); 3495 else { 3496 UsualUnaryConversions(lex); 3497 UsualUnaryConversions(rex); 3498 } 3499 QualType lType = lex->getType(); 3500 QualType rType = rex->getType(); 3501 3502 if (!lType->isFloatingType()) { 3503 // For non-floating point types, check for self-comparisons of the form 3504 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3505 // often indicate logic errors in the program. 3506 // NOTE: Don't warn about comparisons of enum constants. These can arise 3507 // from macro expansions, and are usually quite deliberate. 3508 Expr *LHSStripped = lex->IgnoreParens(); 3509 Expr *RHSStripped = rex->IgnoreParens(); 3510 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3511 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3512 if (DRL->getDecl() == DRR->getDecl() && 3513 !isa<EnumConstantDecl>(DRL->getDecl())) 3514 Diag(Loc, diag::warn_selfcomparison); 3515 3516 if (isa<CastExpr>(LHSStripped)) 3517 LHSStripped = LHSStripped->IgnoreParenCasts(); 3518 if (isa<CastExpr>(RHSStripped)) 3519 RHSStripped = RHSStripped->IgnoreParenCasts(); 3520 3521 // Warn about comparisons against a string constant (unless the other 3522 // operand is null), the user probably wants strcmp. 3523 Expr *literalString = 0; 3524 Expr *literalStringStripped = 0; 3525 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3526 !RHSStripped->isNullPointerConstant(Context)) { 3527 literalString = lex; 3528 literalStringStripped = LHSStripped; 3529 } 3530 else if ((isa<StringLiteral>(RHSStripped) || 3531 isa<ObjCEncodeExpr>(RHSStripped)) && 3532 !LHSStripped->isNullPointerConstant(Context)) { 3533 literalString = rex; 3534 literalStringStripped = RHSStripped; 3535 } 3536 3537 if (literalString) { 3538 std::string resultComparison; 3539 switch (Opc) { 3540 case BinaryOperator::LT: resultComparison = ") < 0"; break; 3541 case BinaryOperator::GT: resultComparison = ") > 0"; break; 3542 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 3543 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 3544 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 3545 case BinaryOperator::NE: resultComparison = ") != 0"; break; 3546 default: assert(false && "Invalid comparison operator"); 3547 } 3548 Diag(Loc, diag::warn_stringcompare) 3549 << isa<ObjCEncodeExpr>(literalStringStripped) 3550 << literalString->getSourceRange() 3551 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 3552 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 3553 "strcmp(") 3554 << CodeModificationHint::CreateInsertion( 3555 PP.getLocForEndOfToken(rex->getLocEnd()), 3556 resultComparison); 3557 } 3558 } 3559 3560 // The result of comparisons is 'bool' in C++, 'int' in C. 3561 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3562 3563 if (isRelational) { 3564 if (lType->isRealType() && rType->isRealType()) 3565 return ResultTy; 3566 } else { 3567 // Check for comparisons of floating point operands using != and ==. 3568 if (lType->isFloatingType()) { 3569 assert(rType->isFloatingType()); 3570 CheckFloatComparison(Loc,lex,rex); 3571 } 3572 3573 if (lType->isArithmeticType() && rType->isArithmeticType()) 3574 return ResultTy; 3575 } 3576 3577 bool LHSIsNull = lex->isNullPointerConstant(Context); 3578 bool RHSIsNull = rex->isNullPointerConstant(Context); 3579 3580 // All of the following pointer related warnings are GCC extensions, except 3581 // when handling null pointer constants. One day, we can consider making them 3582 // errors (when -pedantic-errors is enabled). 3583 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3584 QualType LCanPointeeTy = 3585 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3586 QualType RCanPointeeTy = 3587 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3588 3589 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3590 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3591 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3592 RCanPointeeTy.getUnqualifiedType()) && 3593 !Context.areComparableObjCPointerTypes(lType, rType)) { 3594 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3595 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3596 } 3597 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3598 return ResultTy; 3599 } 3600 // Handle block pointer types. 3601 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 3602 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3603 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3604 3605 if (!LHSIsNull && !RHSIsNull && 3606 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3607 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3608 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3609 } 3610 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3611 return ResultTy; 3612 } 3613 // Allow block pointers to be compared with null pointer constants. 3614 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3615 (lType->isPointerType() && rType->isBlockPointerType())) { 3616 if (!LHSIsNull && !RHSIsNull) { 3617 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3618 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3619 } 3620 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3621 return ResultTy; 3622 } 3623 3624 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3625 if (lType->isPointerType() || rType->isPointerType()) { 3626 const PointerType *LPT = lType->getAsPointerType(); 3627 const PointerType *RPT = rType->getAsPointerType(); 3628 bool LPtrToVoid = LPT ? 3629 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3630 bool RPtrToVoid = RPT ? 3631 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3632 3633 if (!LPtrToVoid && !RPtrToVoid && 3634 !Context.typesAreCompatible(lType, rType)) { 3635 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3636 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3637 ImpCastExprToType(rex, lType); 3638 return ResultTy; 3639 } 3640 ImpCastExprToType(rex, lType); 3641 return ResultTy; 3642 } 3643 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3644 ImpCastExprToType(rex, lType); 3645 return ResultTy; 3646 } else { 3647 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3648 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3649 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3650 ImpCastExprToType(rex, lType); 3651 return ResultTy; 3652 } 3653 } 3654 } 3655 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3656 rType->isIntegerType()) { 3657 if (!RHSIsNull) 3658 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3659 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3660 ImpCastExprToType(rex, lType); // promote the integer to pointer 3661 return ResultTy; 3662 } 3663 if (lType->isIntegerType() && 3664 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3665 if (!LHSIsNull) 3666 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3667 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3668 ImpCastExprToType(lex, rType); // promote the integer to pointer 3669 return ResultTy; 3670 } 3671 // Handle block pointers. 3672 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3673 if (!RHSIsNull) 3674 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3675 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3676 ImpCastExprToType(rex, lType); // promote the integer to pointer 3677 return ResultTy; 3678 } 3679 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3680 if (!LHSIsNull) 3681 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3682 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3683 ImpCastExprToType(lex, rType); // promote the integer to pointer 3684 return ResultTy; 3685 } 3686 return InvalidOperands(Loc, lex, rex); 3687} 3688 3689/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3690/// operates on extended vector types. Instead of producing an IntTy result, 3691/// like a scalar comparison, a vector comparison produces a vector of integer 3692/// types. 3693QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3694 SourceLocation Loc, 3695 bool isRelational) { 3696 // Check to make sure we're operating on vectors of the same type and width, 3697 // Allowing one side to be a scalar of element type. 3698 QualType vType = CheckVectorOperands(Loc, lex, rex); 3699 if (vType.isNull()) 3700 return vType; 3701 3702 QualType lType = lex->getType(); 3703 QualType rType = rex->getType(); 3704 3705 // For non-floating point types, check for self-comparisons of the form 3706 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3707 // often indicate logic errors in the program. 3708 if (!lType->isFloatingType()) { 3709 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3710 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3711 if (DRL->getDecl() == DRR->getDecl()) 3712 Diag(Loc, diag::warn_selfcomparison); 3713 } 3714 3715 // Check for comparisons of floating point operands using != and ==. 3716 if (!isRelational && lType->isFloatingType()) { 3717 assert (rType->isFloatingType()); 3718 CheckFloatComparison(Loc,lex,rex); 3719 } 3720 3721 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 3722 // just reject all vector comparisons for now. 3723 if (1) { 3724 Diag(Loc, diag::err_typecheck_vector_comparison) 3725 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3726 return QualType(); 3727 } 3728 3729 // Return the type for the comparison, which is the same as vector type for 3730 // integer vectors, or an integer type of identical size and number of 3731 // elements for floating point vectors. 3732 if (lType->isIntegerType()) 3733 return lType; 3734 3735 const VectorType *VTy = lType->getAsVectorType(); 3736 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3737 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3738 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3739 if (TypeSize == Context.getTypeSize(Context.LongTy)) 3740 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3741 3742 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3743 "Unhandled vector element size in vector compare"); 3744 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3745} 3746 3747inline QualType Sema::CheckBitwiseOperands( 3748 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3749{ 3750 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3751 return CheckVectorOperands(Loc, lex, rex); 3752 3753 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3754 3755 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3756 return compType; 3757 return InvalidOperands(Loc, lex, rex); 3758} 3759 3760inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3761 Expr *&lex, Expr *&rex, SourceLocation Loc) 3762{ 3763 UsualUnaryConversions(lex); 3764 UsualUnaryConversions(rex); 3765 3766 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3767 return Context.IntTy; 3768 return InvalidOperands(Loc, lex, rex); 3769} 3770 3771/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3772/// is a read-only property; return true if so. A readonly property expression 3773/// depends on various declarations and thus must be treated specially. 3774/// 3775static bool IsReadonlyProperty(Expr *E, Sema &S) 3776{ 3777 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3778 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3779 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3780 QualType BaseType = PropExpr->getBase()->getType(); 3781 if (const PointerType *PTy = BaseType->getAsPointerType()) 3782 if (const ObjCInterfaceType *IFTy = 3783 PTy->getPointeeType()->getAsObjCInterfaceType()) 3784 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3785 if (S.isPropertyReadonly(PDecl, IFace)) 3786 return true; 3787 } 3788 } 3789 return false; 3790} 3791 3792/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3793/// emit an error and return true. If so, return false. 3794static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3795 SourceLocation OrigLoc = Loc; 3796 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context, 3797 &Loc); 3798 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3799 IsLV = Expr::MLV_ReadonlyProperty; 3800 if (IsLV == Expr::MLV_Valid) 3801 return false; 3802 3803 unsigned Diag = 0; 3804 bool NeedType = false; 3805 switch (IsLV) { // C99 6.5.16p2 3806 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3807 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3808 case Expr::MLV_ArrayType: 3809 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3810 NeedType = true; 3811 break; 3812 case Expr::MLV_NotObjectType: 3813 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3814 NeedType = true; 3815 break; 3816 case Expr::MLV_LValueCast: 3817 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3818 break; 3819 case Expr::MLV_InvalidExpression: 3820 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3821 break; 3822 case Expr::MLV_IncompleteType: 3823 case Expr::MLV_IncompleteVoidType: 3824 return S.RequireCompleteType(Loc, E->getType(), 3825 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3826 E->getSourceRange()); 3827 case Expr::MLV_DuplicateVectorComponents: 3828 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 3829 break; 3830 case Expr::MLV_NotBlockQualified: 3831 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 3832 break; 3833 case Expr::MLV_ReadonlyProperty: 3834 Diag = diag::error_readonly_property_assignment; 3835 break; 3836 case Expr::MLV_NoSetterProperty: 3837 Diag = diag::error_nosetter_property_assignment; 3838 break; 3839 } 3840 3841 SourceRange Assign; 3842 if (Loc != OrigLoc) 3843 Assign = SourceRange(OrigLoc, OrigLoc); 3844 if (NeedType) 3845 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange() << Assign; 3846 else 3847 S.Diag(Loc, Diag) << E->getSourceRange() << Assign; 3848 return true; 3849} 3850 3851 3852 3853// C99 6.5.16.1 3854QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 3855 SourceLocation Loc, 3856 QualType CompoundType) { 3857 // Verify that LHS is a modifiable lvalue, and emit error if not. 3858 if (CheckForModifiableLvalue(LHS, Loc, *this)) 3859 return QualType(); 3860 3861 QualType LHSType = LHS->getType(); 3862 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 3863 3864 AssignConvertType ConvTy; 3865 if (CompoundType.isNull()) { 3866 // Simple assignment "x = y". 3867 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 3868 // Special case of NSObject attributes on c-style pointer types. 3869 if (ConvTy == IncompatiblePointer && 3870 ((Context.isObjCNSObjectType(LHSType) && 3871 Context.isObjCObjectPointerType(RHSType)) || 3872 (Context.isObjCNSObjectType(RHSType) && 3873 Context.isObjCObjectPointerType(LHSType)))) 3874 ConvTy = Compatible; 3875 3876 // If the RHS is a unary plus or minus, check to see if they = and + are 3877 // right next to each other. If so, the user may have typo'd "x =+ 4" 3878 // instead of "x += 4". 3879 Expr *RHSCheck = RHS; 3880 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 3881 RHSCheck = ICE->getSubExpr(); 3882 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 3883 if ((UO->getOpcode() == UnaryOperator::Plus || 3884 UO->getOpcode() == UnaryOperator::Minus) && 3885 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 3886 // Only if the two operators are exactly adjacent. 3887 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 3888 // And there is a space or other character before the subexpr of the 3889 // unary +/-. We don't want to warn on "x=-1". 3890 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 3891 UO->getSubExpr()->getLocStart().isFileID()) { 3892 Diag(Loc, diag::warn_not_compound_assign) 3893 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 3894 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 3895 } 3896 } 3897 } else { 3898 // Compound assignment "x += y" 3899 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 3900 } 3901 3902 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 3903 RHS, "assigning")) 3904 return QualType(); 3905 3906 // C99 6.5.16p3: The type of an assignment expression is the type of the 3907 // left operand unless the left operand has qualified type, in which case 3908 // it is the unqualified version of the type of the left operand. 3909 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 3910 // is converted to the type of the assignment expression (above). 3911 // C++ 5.17p1: the type of the assignment expression is that of its left 3912 // oprdu. 3913 return LHSType.getUnqualifiedType(); 3914} 3915 3916// C99 6.5.17 3917QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 3918 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 3919 DefaultFunctionArrayConversion(RHS); 3920 3921 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 3922 // incomplete in C++). 3923 3924 return RHS->getType(); 3925} 3926 3927/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 3928/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 3929QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 3930 bool isInc) { 3931 if (Op->isTypeDependent()) 3932 return Context.DependentTy; 3933 3934 QualType ResType = Op->getType(); 3935 assert(!ResType.isNull() && "no type for increment/decrement expression"); 3936 3937 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 3938 // Decrement of bool is not allowed. 3939 if (!isInc) { 3940 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 3941 return QualType(); 3942 } 3943 // Increment of bool sets it to true, but is deprecated. 3944 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 3945 } else if (ResType->isRealType()) { 3946 // OK! 3947 } else if (const PointerType *PT = ResType->getAsPointerType()) { 3948 // C99 6.5.2.4p2, 6.5.6p2 3949 if (PT->getPointeeType()->isVoidType()) { 3950 if (getLangOptions().CPlusPlus) { 3951 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 3952 << Op->getSourceRange(); 3953 return QualType(); 3954 } 3955 3956 // Pointer to void is a GNU extension in C. 3957 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 3958 } else if (PT->getPointeeType()->isFunctionType()) { 3959 if (getLangOptions().CPlusPlus) { 3960 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 3961 << Op->getType() << Op->getSourceRange(); 3962 return QualType(); 3963 } 3964 3965 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 3966 << ResType << Op->getSourceRange(); 3967 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 3968 diag::err_typecheck_arithmetic_incomplete_type, 3969 Op->getSourceRange(), SourceRange(), 3970 ResType)) 3971 return QualType(); 3972 } else if (ResType->isComplexType()) { 3973 // C99 does not support ++/-- on complex types, we allow as an extension. 3974 Diag(OpLoc, diag::ext_integer_increment_complex) 3975 << ResType << Op->getSourceRange(); 3976 } else { 3977 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 3978 << ResType << Op->getSourceRange(); 3979 return QualType(); 3980 } 3981 // At this point, we know we have a real, complex or pointer type. 3982 // Now make sure the operand is a modifiable lvalue. 3983 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 3984 return QualType(); 3985 return ResType; 3986} 3987 3988/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 3989/// This routine allows us to typecheck complex/recursive expressions 3990/// where the declaration is needed for type checking. We only need to 3991/// handle cases when the expression references a function designator 3992/// or is an lvalue. Here are some examples: 3993/// - &(x) => x 3994/// - &*****f => f for f a function designator. 3995/// - &s.xx => s 3996/// - &s.zz[1].yy -> s, if zz is an array 3997/// - *(x + 1) -> x, if x is an array 3998/// - &"123"[2] -> 0 3999/// - & __real__ x -> x 4000static NamedDecl *getPrimaryDecl(Expr *E) { 4001 switch (E->getStmtClass()) { 4002 case Stmt::DeclRefExprClass: 4003 case Stmt::QualifiedDeclRefExprClass: 4004 return cast<DeclRefExpr>(E)->getDecl(); 4005 case Stmt::MemberExprClass: 4006 // If this is an arrow operator, the address is an offset from 4007 // the base's value, so the object the base refers to is 4008 // irrelevant. 4009 if (cast<MemberExpr>(E)->isArrow()) 4010 return 0; 4011 // Otherwise, the expression refers to a part of the base 4012 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 4013 case Stmt::ArraySubscriptExprClass: { 4014 // FIXME: This code shouldn't be necessary! We should catch the 4015 // implicit promotion of register arrays earlier. 4016 Expr* Base = cast<ArraySubscriptExpr>(E)->getBase(); 4017 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Base)) { 4018 if (ICE->getSubExpr()->getType()->isArrayType()) 4019 return getPrimaryDecl(ICE->getSubExpr()); 4020 } 4021 return 0; 4022 } 4023 case Stmt::UnaryOperatorClass: { 4024 UnaryOperator *UO = cast<UnaryOperator>(E); 4025 4026 switch(UO->getOpcode()) { 4027 case UnaryOperator::Real: 4028 case UnaryOperator::Imag: 4029 case UnaryOperator::Extension: 4030 return getPrimaryDecl(UO->getSubExpr()); 4031 default: 4032 return 0; 4033 } 4034 } 4035 case Stmt::ParenExprClass: 4036 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 4037 case Stmt::ImplicitCastExprClass: 4038 // If the result of an implicit cast is an l-value, we care about 4039 // the sub-expression; otherwise, the result here doesn't matter. 4040 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 4041 default: 4042 return 0; 4043 } 4044} 4045 4046/// CheckAddressOfOperand - The operand of & must be either a function 4047/// designator or an lvalue designating an object. If it is an lvalue, the 4048/// object cannot be declared with storage class register or be a bit field. 4049/// Note: The usual conversions are *not* applied to the operand of the & 4050/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 4051/// In C++, the operand might be an overloaded function name, in which case 4052/// we allow the '&' but retain the overloaded-function type. 4053QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 4054 // Make sure to ignore parentheses in subsequent checks 4055 op = op->IgnoreParens(); 4056 4057 if (op->isTypeDependent()) 4058 return Context.DependentTy; 4059 4060 if (getLangOptions().C99) { 4061 // Implement C99-only parts of addressof rules. 4062 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 4063 if (uOp->getOpcode() == UnaryOperator::Deref) 4064 // Per C99 6.5.3.2, the address of a deref always returns a valid result 4065 // (assuming the deref expression is valid). 4066 return uOp->getSubExpr()->getType(); 4067 } 4068 // Technically, there should be a check for array subscript 4069 // expressions here, but the result of one is always an lvalue anyway. 4070 } 4071 NamedDecl *dcl = getPrimaryDecl(op); 4072 Expr::isLvalueResult lval = op->isLvalue(Context); 4073 4074 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 4075 // The operand must be either an l-value or a function designator 4076 if (!dcl || !isa<FunctionDecl>(dcl)) { 4077 // FIXME: emit more specific diag... 4078 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 4079 << op->getSourceRange(); 4080 return QualType(); 4081 } 4082 } else if (op->isBitField()) { // C99 6.5.3.2p1 4083 // The operand cannot be a bit-field 4084 Diag(OpLoc, diag::err_typecheck_address_of) 4085 << "bit-field" << op->getSourceRange(); 4086 return QualType(); 4087 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4088 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4089 // The operand cannot be an element of a vector 4090 Diag(OpLoc, diag::err_typecheck_address_of) 4091 << "vector element" << op->getSourceRange(); 4092 return QualType(); 4093 } else if (dcl) { // C99 6.5.3.2p1 4094 // We have an lvalue with a decl. Make sure the decl is not declared 4095 // with the register storage-class specifier. 4096 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4097 if (vd->getStorageClass() == VarDecl::Register) { 4098 Diag(OpLoc, diag::err_typecheck_address_of) 4099 << "register variable" << op->getSourceRange(); 4100 return QualType(); 4101 } 4102 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4103 return Context.OverloadTy; 4104 } else if (isa<FieldDecl>(dcl)) { 4105 // Okay: we can take the address of a field. 4106 // Could be a pointer to member, though, if there is an explicit 4107 // scope qualifier for the class. 4108 if (isa<QualifiedDeclRefExpr>(op)) { 4109 DeclContext *Ctx = dcl->getDeclContext(); 4110 if (Ctx && Ctx->isRecord()) 4111 return Context.getMemberPointerType(op->getType(), 4112 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4113 } 4114 } else if (isa<FunctionDecl>(dcl)) { 4115 // Okay: we can take the address of a function. 4116 // As above. 4117 if (isa<QualifiedDeclRefExpr>(op)) { 4118 DeclContext *Ctx = dcl->getDeclContext(); 4119 if (Ctx && Ctx->isRecord()) 4120 return Context.getMemberPointerType(op->getType(), 4121 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4122 } 4123 } 4124 else 4125 assert(0 && "Unknown/unexpected decl type"); 4126 } 4127 4128 // If the operand has type "type", the result has type "pointer to type". 4129 return Context.getPointerType(op->getType()); 4130} 4131 4132QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4133 if (Op->isTypeDependent()) 4134 return Context.DependentTy; 4135 4136 UsualUnaryConversions(Op); 4137 QualType Ty = Op->getType(); 4138 4139 // Note that per both C89 and C99, this is always legal, even if ptype is an 4140 // incomplete type or void. It would be possible to warn about dereferencing 4141 // a void pointer, but it's completely well-defined, and such a warning is 4142 // unlikely to catch any mistakes. 4143 if (const PointerType *PT = Ty->getAsPointerType()) 4144 return PT->getPointeeType(); 4145 4146 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4147 << Ty << Op->getSourceRange(); 4148 return QualType(); 4149} 4150 4151static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4152 tok::TokenKind Kind) { 4153 BinaryOperator::Opcode Opc; 4154 switch (Kind) { 4155 default: assert(0 && "Unknown binop!"); 4156 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4157 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4158 case tok::star: Opc = BinaryOperator::Mul; break; 4159 case tok::slash: Opc = BinaryOperator::Div; break; 4160 case tok::percent: Opc = BinaryOperator::Rem; break; 4161 case tok::plus: Opc = BinaryOperator::Add; break; 4162 case tok::minus: Opc = BinaryOperator::Sub; break; 4163 case tok::lessless: Opc = BinaryOperator::Shl; break; 4164 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4165 case tok::lessequal: Opc = BinaryOperator::LE; break; 4166 case tok::less: Opc = BinaryOperator::LT; break; 4167 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4168 case tok::greater: Opc = BinaryOperator::GT; break; 4169 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4170 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4171 case tok::amp: Opc = BinaryOperator::And; break; 4172 case tok::caret: Opc = BinaryOperator::Xor; break; 4173 case tok::pipe: Opc = BinaryOperator::Or; break; 4174 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4175 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4176 case tok::equal: Opc = BinaryOperator::Assign; break; 4177 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4178 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4179 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4180 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4181 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4182 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4183 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4184 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4185 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4186 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4187 case tok::comma: Opc = BinaryOperator::Comma; break; 4188 } 4189 return Opc; 4190} 4191 4192static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4193 tok::TokenKind Kind) { 4194 UnaryOperator::Opcode Opc; 4195 switch (Kind) { 4196 default: assert(0 && "Unknown unary op!"); 4197 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4198 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4199 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4200 case tok::star: Opc = UnaryOperator::Deref; break; 4201 case tok::plus: Opc = UnaryOperator::Plus; break; 4202 case tok::minus: Opc = UnaryOperator::Minus; break; 4203 case tok::tilde: Opc = UnaryOperator::Not; break; 4204 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4205 case tok::kw___real: Opc = UnaryOperator::Real; break; 4206 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4207 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4208 } 4209 return Opc; 4210} 4211 4212/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4213/// operator @p Opc at location @c TokLoc. This routine only supports 4214/// built-in operations; ActOnBinOp handles overloaded operators. 4215Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4216 unsigned Op, 4217 Expr *lhs, Expr *rhs) { 4218 QualType ResultTy; // Result type of the binary operator. 4219 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4220 // The following two variables are used for compound assignment operators 4221 QualType CompLHSTy; // Type of LHS after promotions for computation 4222 QualType CompResultTy; // Type of computation result 4223 4224 switch (Opc) { 4225 case BinaryOperator::Assign: 4226 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4227 break; 4228 case BinaryOperator::PtrMemD: 4229 case BinaryOperator::PtrMemI: 4230 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4231 Opc == BinaryOperator::PtrMemI); 4232 break; 4233 case BinaryOperator::Mul: 4234 case BinaryOperator::Div: 4235 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4236 break; 4237 case BinaryOperator::Rem: 4238 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4239 break; 4240 case BinaryOperator::Add: 4241 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4242 break; 4243 case BinaryOperator::Sub: 4244 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4245 break; 4246 case BinaryOperator::Shl: 4247 case BinaryOperator::Shr: 4248 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4249 break; 4250 case BinaryOperator::LE: 4251 case BinaryOperator::LT: 4252 case BinaryOperator::GE: 4253 case BinaryOperator::GT: 4254 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4255 break; 4256 case BinaryOperator::EQ: 4257 case BinaryOperator::NE: 4258 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4259 break; 4260 case BinaryOperator::And: 4261 case BinaryOperator::Xor: 4262 case BinaryOperator::Or: 4263 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4264 break; 4265 case BinaryOperator::LAnd: 4266 case BinaryOperator::LOr: 4267 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4268 break; 4269 case BinaryOperator::MulAssign: 4270 case BinaryOperator::DivAssign: 4271 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4272 CompLHSTy = CompResultTy; 4273 if (!CompResultTy.isNull()) 4274 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4275 break; 4276 case BinaryOperator::RemAssign: 4277 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4278 CompLHSTy = CompResultTy; 4279 if (!CompResultTy.isNull()) 4280 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4281 break; 4282 case BinaryOperator::AddAssign: 4283 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4284 if (!CompResultTy.isNull()) 4285 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4286 break; 4287 case BinaryOperator::SubAssign: 4288 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4289 if (!CompResultTy.isNull()) 4290 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4291 break; 4292 case BinaryOperator::ShlAssign: 4293 case BinaryOperator::ShrAssign: 4294 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4295 CompLHSTy = CompResultTy; 4296 if (!CompResultTy.isNull()) 4297 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4298 break; 4299 case BinaryOperator::AndAssign: 4300 case BinaryOperator::XorAssign: 4301 case BinaryOperator::OrAssign: 4302 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4303 CompLHSTy = CompResultTy; 4304 if (!CompResultTy.isNull()) 4305 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4306 break; 4307 case BinaryOperator::Comma: 4308 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4309 break; 4310 } 4311 if (ResultTy.isNull()) 4312 return ExprError(); 4313 if (CompResultTy.isNull()) 4314 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4315 else 4316 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4317 CompLHSTy, CompResultTy, 4318 OpLoc)); 4319} 4320 4321// Binary Operators. 'Tok' is the token for the operator. 4322Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4323 tok::TokenKind Kind, 4324 ExprArg LHS, ExprArg RHS) { 4325 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4326 Expr *lhs = (Expr *)LHS.release(), *rhs = (Expr*)RHS.release(); 4327 4328 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4329 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4330 4331 if (getLangOptions().CPlusPlus && 4332 (lhs->getType()->isOverloadableType() || 4333 rhs->getType()->isOverloadableType())) { 4334 // Find all of the overloaded operators visible from this 4335 // point. We perform both an operator-name lookup from the local 4336 // scope and an argument-dependent lookup based on the types of 4337 // the arguments. 4338 FunctionSet Functions; 4339 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4340 if (OverOp != OO_None) { 4341 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4342 Functions); 4343 Expr *Args[2] = { lhs, rhs }; 4344 DeclarationName OpName 4345 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4346 ArgumentDependentLookup(OpName, Args, 2, Functions); 4347 } 4348 4349 // Build the (potentially-overloaded, potentially-dependent) 4350 // binary operation. 4351 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4352 } 4353 4354 // Build a built-in binary operation. 4355 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4356} 4357 4358Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4359 unsigned OpcIn, 4360 ExprArg InputArg) { 4361 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4362 4363 // FIXME: Input is modified below, but InputArg is not updated 4364 // appropriately. 4365 Expr *Input = (Expr *)InputArg.get(); 4366 QualType resultType; 4367 switch (Opc) { 4368 case UnaryOperator::PostInc: 4369 case UnaryOperator::PostDec: 4370 case UnaryOperator::OffsetOf: 4371 assert(false && "Invalid unary operator"); 4372 break; 4373 4374 case UnaryOperator::PreInc: 4375 case UnaryOperator::PreDec: 4376 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4377 Opc == UnaryOperator::PreInc); 4378 break; 4379 case UnaryOperator::AddrOf: 4380 resultType = CheckAddressOfOperand(Input, OpLoc); 4381 break; 4382 case UnaryOperator::Deref: 4383 DefaultFunctionArrayConversion(Input); 4384 resultType = CheckIndirectionOperand(Input, OpLoc); 4385 break; 4386 case UnaryOperator::Plus: 4387 case UnaryOperator::Minus: 4388 UsualUnaryConversions(Input); 4389 resultType = Input->getType(); 4390 if (resultType->isDependentType()) 4391 break; 4392 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4393 break; 4394 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4395 resultType->isEnumeralType()) 4396 break; 4397 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4398 Opc == UnaryOperator::Plus && 4399 resultType->isPointerType()) 4400 break; 4401 4402 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4403 << resultType << Input->getSourceRange()); 4404 case UnaryOperator::Not: // bitwise complement 4405 UsualUnaryConversions(Input); 4406 resultType = Input->getType(); 4407 if (resultType->isDependentType()) 4408 break; 4409 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4410 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4411 // C99 does not support '~' for complex conjugation. 4412 Diag(OpLoc, diag::ext_integer_complement_complex) 4413 << resultType << Input->getSourceRange(); 4414 else if (!resultType->isIntegerType()) 4415 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4416 << resultType << Input->getSourceRange()); 4417 break; 4418 case UnaryOperator::LNot: // logical negation 4419 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4420 DefaultFunctionArrayConversion(Input); 4421 resultType = Input->getType(); 4422 if (resultType->isDependentType()) 4423 break; 4424 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4425 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4426 << resultType << Input->getSourceRange()); 4427 // LNot always has type int. C99 6.5.3.3p5. 4428 // In C++, it's bool. C++ 5.3.1p8 4429 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4430 break; 4431 case UnaryOperator::Real: 4432 case UnaryOperator::Imag: 4433 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4434 break; 4435 case UnaryOperator::Extension: 4436 resultType = Input->getType(); 4437 break; 4438 } 4439 if (resultType.isNull()) 4440 return ExprError(); 4441 4442 InputArg.release(); 4443 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4444} 4445 4446// Unary Operators. 'Tok' is the token for the operator. 4447Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4448 tok::TokenKind Op, ExprArg input) { 4449 Expr *Input = (Expr*)input.get(); 4450 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4451 4452 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4453 // Find all of the overloaded operators visible from this 4454 // point. We perform both an operator-name lookup from the local 4455 // scope and an argument-dependent lookup based on the types of 4456 // the arguments. 4457 FunctionSet Functions; 4458 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4459 if (OverOp != OO_None) { 4460 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4461 Functions); 4462 DeclarationName OpName 4463 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4464 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4465 } 4466 4467 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4468 } 4469 4470 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4471} 4472 4473/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4474Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4475 SourceLocation LabLoc, 4476 IdentifierInfo *LabelII) { 4477 // Look up the record for this label identifier. 4478 LabelStmt *&LabelDecl = getLabelMap()[LabelII]; 4479 4480 // If we haven't seen this label yet, create a forward reference. It 4481 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4482 if (LabelDecl == 0) 4483 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4484 4485 // Create the AST node. The address of a label always has type 'void*'. 4486 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4487 Context.getPointerType(Context.VoidTy))); 4488} 4489 4490Sema::OwningExprResult 4491Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4492 SourceLocation RPLoc) { // "({..})" 4493 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4494 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4495 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4496 4497 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4498 if (isFileScope) 4499 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4500 4501 // FIXME: there are a variety of strange constraints to enforce here, for 4502 // example, it is not possible to goto into a stmt expression apparently. 4503 // More semantic analysis is needed. 4504 4505 // If there are sub stmts in the compound stmt, take the type of the last one 4506 // as the type of the stmtexpr. 4507 QualType Ty = Context.VoidTy; 4508 4509 if (!Compound->body_empty()) { 4510 Stmt *LastStmt = Compound->body_back(); 4511 // If LastStmt is a label, skip down through into the body. 4512 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4513 LastStmt = Label->getSubStmt(); 4514 4515 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4516 Ty = LastExpr->getType(); 4517 } 4518 4519 // FIXME: Check that expression type is complete/non-abstract; statement 4520 // expressions are not lvalues. 4521 4522 substmt.release(); 4523 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4524} 4525 4526Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4527 SourceLocation BuiltinLoc, 4528 SourceLocation TypeLoc, 4529 TypeTy *argty, 4530 OffsetOfComponent *CompPtr, 4531 unsigned NumComponents, 4532 SourceLocation RPLoc) { 4533 // FIXME: This function leaks all expressions in the offset components on 4534 // error. 4535 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4536 assert(!ArgTy.isNull() && "Missing type argument!"); 4537 4538 bool Dependent = ArgTy->isDependentType(); 4539 4540 // We must have at least one component that refers to the type, and the first 4541 // one is known to be a field designator. Verify that the ArgTy represents 4542 // a struct/union/class. 4543 if (!Dependent && !ArgTy->isRecordType()) 4544 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4545 4546 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 4547 // with an incomplete type would be illegal. 4548 4549 // Otherwise, create a null pointer as the base, and iteratively process 4550 // the offsetof designators. 4551 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4552 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4553 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4554 ArgTy, SourceLocation()); 4555 4556 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4557 // GCC extension, diagnose them. 4558 // FIXME: This diagnostic isn't actually visible because the location is in 4559 // a system header! 4560 if (NumComponents != 1) 4561 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4562 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4563 4564 if (!Dependent) { 4565 // FIXME: Dependent case loses a lot of information here. And probably 4566 // leaks like a sieve. 4567 for (unsigned i = 0; i != NumComponents; ++i) { 4568 const OffsetOfComponent &OC = CompPtr[i]; 4569 if (OC.isBrackets) { 4570 // Offset of an array sub-field. TODO: Should we allow vector elements? 4571 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4572 if (!AT) { 4573 Res->Destroy(Context); 4574 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 4575 << Res->getType()); 4576 } 4577 4578 // FIXME: C++: Verify that operator[] isn't overloaded. 4579 4580 // Promote the array so it looks more like a normal array subscript 4581 // expression. 4582 DefaultFunctionArrayConversion(Res); 4583 4584 // C99 6.5.2.1p1 4585 Expr *Idx = static_cast<Expr*>(OC.U.E); 4586 // FIXME: Leaks Res 4587 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4588 return ExprError(Diag(Idx->getLocStart(), 4589 diag::err_typecheck_subscript) 4590 << Idx->getSourceRange()); 4591 4592 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4593 OC.LocEnd); 4594 continue; 4595 } 4596 4597 const RecordType *RC = Res->getType()->getAsRecordType(); 4598 if (!RC) { 4599 Res->Destroy(Context); 4600 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 4601 << Res->getType()); 4602 } 4603 4604 // Get the decl corresponding to this. 4605 RecordDecl *RD = RC->getDecl(); 4606 FieldDecl *MemberDecl 4607 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4608 LookupMemberName) 4609 .getAsDecl()); 4610 // FIXME: Leaks Res 4611 if (!MemberDecl) 4612 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 4613 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 4614 4615 // FIXME: C++: Verify that MemberDecl isn't a static field. 4616 // FIXME: Verify that MemberDecl isn't a bitfield. 4617 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 4618 // matter here. 4619 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4620 MemberDecl->getType().getNonReferenceType()); 4621 } 4622 } 4623 4624 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4625 Context.getSizeType(), BuiltinLoc)); 4626} 4627 4628 4629Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4630 TypeTy *arg1,TypeTy *arg2, 4631 SourceLocation RPLoc) { 4632 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4633 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4634 4635 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4636 4637 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 4638 argT1, argT2, RPLoc)); 4639} 4640 4641Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 4642 ExprArg cond, 4643 ExprArg expr1, ExprArg expr2, 4644 SourceLocation RPLoc) { 4645 Expr *CondExpr = static_cast<Expr*>(cond.get()); 4646 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 4647 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 4648 4649 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4650 4651 QualType resType; 4652 if (CondExpr->isValueDependent()) { 4653 resType = Context.DependentTy; 4654 } else { 4655 // The conditional expression is required to be a constant expression. 4656 llvm::APSInt condEval(32); 4657 SourceLocation ExpLoc; 4658 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4659 return ExprError(Diag(ExpLoc, 4660 diag::err_typecheck_choose_expr_requires_constant) 4661 << CondExpr->getSourceRange()); 4662 4663 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4664 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 4665 } 4666 4667 cond.release(); expr1.release(); expr2.release(); 4668 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4669 resType, RPLoc)); 4670} 4671 4672//===----------------------------------------------------------------------===// 4673// Clang Extensions. 4674//===----------------------------------------------------------------------===// 4675 4676/// ActOnBlockStart - This callback is invoked when a block literal is started. 4677void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4678 // Analyze block parameters. 4679 BlockSemaInfo *BSI = new BlockSemaInfo(); 4680 4681 // Add BSI to CurBlock. 4682 BSI->PrevBlockInfo = CurBlock; 4683 CurBlock = BSI; 4684 4685 BSI->ReturnType = 0; 4686 BSI->TheScope = BlockScope; 4687 BSI->hasBlockDeclRefExprs = false; 4688 BSI->SavedFunctionNeedsScopeChecking = CurFunctionNeedsScopeChecking; 4689 CurFunctionNeedsScopeChecking = false; 4690 4691 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4692 PushDeclContext(BlockScope, BSI->TheDecl); 4693} 4694 4695void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4696 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4697 4698 if (ParamInfo.getNumTypeObjects() == 0 4699 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4700 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4701 4702 // The parameter list is optional, if there was none, assume (). 4703 if (!T->isFunctionType()) 4704 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4705 4706 CurBlock->hasPrototype = true; 4707 CurBlock->isVariadic = false; 4708 4709 QualType RetTy = T.getTypePtr()->getAsFunctionType()->getResultType(); 4710 4711 // Do not allow returning a objc interface by-value. 4712 if (RetTy->isObjCInterfaceType()) { 4713 Diag(ParamInfo.getSourceRange().getBegin(), 4714 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 4715 return; 4716 } 4717 return; 4718 } 4719 4720 // Analyze arguments to block. 4721 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4722 "Not a function declarator!"); 4723 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4724 4725 CurBlock->hasPrototype = FTI.hasPrototype; 4726 CurBlock->isVariadic = true; 4727 4728 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4729 // no arguments, not a function that takes a single void argument. 4730 if (FTI.hasPrototype && 4731 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4732 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 4733 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 4734 // empty arg list, don't push any params. 4735 CurBlock->isVariadic = false; 4736 } else if (FTI.hasPrototype) { 4737 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4738 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 4739 CurBlock->isVariadic = FTI.isVariadic; 4740 } 4741 CurBlock->TheDecl->setParams(Context, &CurBlock->Params[0], 4742 CurBlock->Params.size()); 4743 4744 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4745 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4746 // If this has an identifier, add it to the scope stack. 4747 if ((*AI)->getIdentifier()) 4748 PushOnScopeChains(*AI, CurBlock->TheScope); 4749 4750 // Analyze the return type. 4751 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4752 QualType RetTy = T->getAsFunctionType()->getResultType(); 4753 4754 // Do not allow returning a objc interface by-value. 4755 if (RetTy->isObjCInterfaceType()) { 4756 Diag(ParamInfo.getSourceRange().getBegin(), 4757 diag::err_object_cannot_be_passed_returned_by_value) << 0 << RetTy; 4758 } else if (!RetTy->isDependentType()) 4759 CurBlock->ReturnType = RetTy.getTypePtr(); 4760} 4761 4762/// ActOnBlockError - If there is an error parsing a block, this callback 4763/// is invoked to pop the information about the block from the action impl. 4764void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4765 // Ensure that CurBlock is deleted. 4766 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4767 4768 CurFunctionNeedsScopeChecking = CurBlock->SavedFunctionNeedsScopeChecking; 4769 4770 // Pop off CurBlock, handle nested blocks. 4771 PopDeclContext(); 4772 CurBlock = CurBlock->PrevBlockInfo; 4773 // FIXME: Delete the ParmVarDecl objects as well??? 4774} 4775 4776/// ActOnBlockStmtExpr - This is called when the body of a block statement 4777/// literal was successfully completed. ^(int x){...} 4778Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 4779 StmtArg body, Scope *CurScope) { 4780 // If blocks are disabled, emit an error. 4781 if (!LangOpts.Blocks) 4782 Diag(CaretLoc, diag::err_blocks_disable); 4783 4784 // Ensure that CurBlock is deleted. 4785 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4786 4787 PopDeclContext(); 4788 4789 // Pop off CurBlock, handle nested blocks. 4790 CurBlock = CurBlock->PrevBlockInfo; 4791 4792 QualType RetTy = Context.VoidTy; 4793 if (BSI->ReturnType) 4794 RetTy = QualType(BSI->ReturnType, 0); 4795 4796 llvm::SmallVector<QualType, 8> ArgTypes; 4797 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4798 ArgTypes.push_back(BSI->Params[i]->getType()); 4799 4800 QualType BlockTy; 4801 if (!BSI->hasPrototype) 4802 BlockTy = Context.getFunctionNoProtoType(RetTy); 4803 else 4804 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 4805 BSI->isVariadic, 0); 4806 4807 // FIXME: Check that return/parameter types are complete/non-abstract 4808 4809 BlockTy = Context.getBlockPointerType(BlockTy); 4810 4811 // If needed, diagnose invalid gotos and switches in the block. 4812 if (CurFunctionNeedsScopeChecking) 4813 DiagnoseInvalidJumps(static_cast<CompoundStmt*>(body.get())); 4814 CurFunctionNeedsScopeChecking = BSI->SavedFunctionNeedsScopeChecking; 4815 4816 BSI->TheDecl->setBody(static_cast<CompoundStmt*>(body.release())); 4817 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 4818 BSI->hasBlockDeclRefExprs)); 4819} 4820 4821Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 4822 ExprArg expr, TypeTy *type, 4823 SourceLocation RPLoc) { 4824 QualType T = QualType::getFromOpaquePtr(type); 4825 Expr *E = static_cast<Expr*>(expr.get()); 4826 Expr *OrigExpr = E; 4827 4828 InitBuiltinVaListType(); 4829 4830 // Get the va_list type 4831 QualType VaListType = Context.getBuiltinVaListType(); 4832 // Deal with implicit array decay; for example, on x86-64, 4833 // va_list is an array, but it's supposed to decay to 4834 // a pointer for va_arg. 4835 if (VaListType->isArrayType()) 4836 VaListType = Context.getArrayDecayedType(VaListType); 4837 // Make sure the input expression also decays appropriately. 4838 UsualUnaryConversions(E); 4839 4840 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) { 4841 return ExprError(Diag(E->getLocStart(), 4842 diag::err_first_argument_to_va_arg_not_of_type_va_list) 4843 << OrigExpr->getType() << E->getSourceRange()); 4844 } 4845 4846 // FIXME: Check that type is complete/non-abstract 4847 // FIXME: Warn if a non-POD type is passed in. 4848 4849 expr.release(); 4850 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 4851 RPLoc)); 4852} 4853 4854Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 4855 // The type of __null will be int or long, depending on the size of 4856 // pointers on the target. 4857 QualType Ty; 4858 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 4859 Ty = Context.IntTy; 4860 else 4861 Ty = Context.LongTy; 4862 4863 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 4864} 4865 4866bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 4867 SourceLocation Loc, 4868 QualType DstType, QualType SrcType, 4869 Expr *SrcExpr, const char *Flavor) { 4870 // Decode the result (notice that AST's are still created for extensions). 4871 bool isInvalid = false; 4872 unsigned DiagKind; 4873 switch (ConvTy) { 4874 default: assert(0 && "Unknown conversion type"); 4875 case Compatible: return false; 4876 case PointerToInt: 4877 DiagKind = diag::ext_typecheck_convert_pointer_int; 4878 break; 4879 case IntToPointer: 4880 DiagKind = diag::ext_typecheck_convert_int_pointer; 4881 break; 4882 case IncompatiblePointer: 4883 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 4884 break; 4885 case IncompatiblePointerSign: 4886 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 4887 break; 4888 case FunctionVoidPointer: 4889 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 4890 break; 4891 case CompatiblePointerDiscardsQualifiers: 4892 // If the qualifiers lost were because we were applying the 4893 // (deprecated) C++ conversion from a string literal to a char* 4894 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 4895 // Ideally, this check would be performed in 4896 // CheckPointerTypesForAssignment. However, that would require a 4897 // bit of refactoring (so that the second argument is an 4898 // expression, rather than a type), which should be done as part 4899 // of a larger effort to fix CheckPointerTypesForAssignment for 4900 // C++ semantics. 4901 if (getLangOptions().CPlusPlus && 4902 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 4903 return false; 4904 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 4905 break; 4906 case IntToBlockPointer: 4907 DiagKind = diag::err_int_to_block_pointer; 4908 break; 4909 case IncompatibleBlockPointer: 4910 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 4911 break; 4912 case IncompatibleObjCQualifiedId: 4913 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 4914 // it can give a more specific diagnostic. 4915 DiagKind = diag::warn_incompatible_qualified_id; 4916 break; 4917 case IncompatibleVectors: 4918 DiagKind = diag::warn_incompatible_vectors; 4919 break; 4920 case Incompatible: 4921 DiagKind = diag::err_typecheck_convert_incompatible; 4922 isInvalid = true; 4923 break; 4924 } 4925 4926 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 4927 << SrcExpr->getSourceRange(); 4928 return isInvalid; 4929} 4930 4931bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 4932{ 4933 Expr::EvalResult EvalResult; 4934 4935 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 4936 EvalResult.HasSideEffects) { 4937 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 4938 4939 if (EvalResult.Diag) { 4940 // We only show the note if it's not the usual "invalid subexpression" 4941 // or if it's actually in a subexpression. 4942 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 4943 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 4944 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4945 } 4946 4947 return true; 4948 } 4949 4950 if (EvalResult.Diag) { 4951 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 4952 E->getSourceRange(); 4953 4954 // Print the reason it's not a constant. 4955 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4956 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4957 } 4958 4959 if (Result) 4960 *Result = EvalResult.Val.getInt(); 4961 return false; 4962} 4963