SemaExpr.cpp revision e7c6f7aa7e8ee1f0acacc314dcf59d5dadff1524
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/LiteralSupport.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29/// \brief Determine whether the use of this declaration is valid, and 30/// emit any corresponding diagnostics. 31/// 32/// This routine diagnoses various problems with referencing 33/// declarations that can occur when using a declaration. For example, 34/// it might warn if a deprecated or unavailable declaration is being 35/// used, or produce an error (and return true) if a C++0x deleted 36/// function is being used. 37/// 38/// \returns true if there was an error (this declaration cannot be 39/// referenced), false otherwise. 40bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 41 // See if the decl is deprecated. 42 if (D->getAttr<DeprecatedAttr>()) { 43 // Implementing deprecated stuff requires referencing deprecated 44 // stuff. Don't warn if we are implementing a deprecated 45 // construct. 46 bool isSilenced = false; 47 48 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 49 // If this reference happens *in* a deprecated function or method, don't 50 // warn. 51 isSilenced = ND->getAttr<DeprecatedAttr>(); 52 53 // If this is an Objective-C method implementation, check to see if the 54 // method was deprecated on the declaration, not the definition. 55 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 56 // The semantic decl context of a ObjCMethodDecl is the 57 // ObjCImplementationDecl. 58 if (ObjCImplementationDecl *Impl 59 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 60 61 MD = Impl->getClassInterface()->getMethod(MD->getSelector(), 62 MD->isInstanceMethod()); 63 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); 64 } 65 } 66 } 67 68 if (!isSilenced) 69 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 70 } 71 72 // See if this is a deleted function. 73 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 74 if (FD->isDeleted()) { 75 Diag(Loc, diag::err_deleted_function_use); 76 Diag(D->getLocation(), diag::note_unavailable_here) << true; 77 return true; 78 } 79 } 80 81 // See if the decl is unavailable 82 if (D->getAttr<UnavailableAttr>()) { 83 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 84 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 85 } 86 87 return false; 88} 89 90SourceRange Sema::getExprRange(ExprTy *E) const { 91 Expr *Ex = (Expr *)E; 92 return Ex? Ex->getSourceRange() : SourceRange(); 93} 94 95//===----------------------------------------------------------------------===// 96// Standard Promotions and Conversions 97//===----------------------------------------------------------------------===// 98 99/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 100void Sema::DefaultFunctionArrayConversion(Expr *&E) { 101 QualType Ty = E->getType(); 102 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 103 104 if (Ty->isFunctionType()) 105 ImpCastExprToType(E, Context.getPointerType(Ty)); 106 else if (Ty->isArrayType()) { 107 // In C90 mode, arrays only promote to pointers if the array expression is 108 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 109 // type 'array of type' is converted to an expression that has type 'pointer 110 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 111 // that has type 'array of type' ...". The relevant change is "an lvalue" 112 // (C90) to "an expression" (C99). 113 // 114 // C++ 4.2p1: 115 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 116 // T" can be converted to an rvalue of type "pointer to T". 117 // 118 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 119 E->isLvalue(Context) == Expr::LV_Valid) 120 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 121 } 122} 123 124/// UsualUnaryConversions - Performs various conversions that are common to most 125/// operators (C99 6.3). The conversions of array and function types are 126/// sometimes surpressed. For example, the array->pointer conversion doesn't 127/// apply if the array is an argument to the sizeof or address (&) operators. 128/// In these instances, this routine should *not* be called. 129Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 130 QualType Ty = Expr->getType(); 131 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 132 133 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 134 ImpCastExprToType(Expr, Context.IntTy); 135 else 136 DefaultFunctionArrayConversion(Expr); 137 138 return Expr; 139} 140 141/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 142/// do not have a prototype. Arguments that have type float are promoted to 143/// double. All other argument types are converted by UsualUnaryConversions(). 144void Sema::DefaultArgumentPromotion(Expr *&Expr) { 145 QualType Ty = Expr->getType(); 146 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 147 148 // If this is a 'float' (CVR qualified or typedef) promote to double. 149 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 150 if (BT->getKind() == BuiltinType::Float) 151 return ImpCastExprToType(Expr, Context.DoubleTy); 152 153 UsualUnaryConversions(Expr); 154} 155 156// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 157// will warn if the resulting type is not a POD type. 158void Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 159 DefaultArgumentPromotion(Expr); 160 161 if (!Expr->getType()->isPODType()) { 162 Diag(Expr->getLocStart(), 163 diag::warn_cannot_pass_non_pod_arg_to_vararg) << 164 Expr->getType() << CT; 165 } 166} 167 168 169/// UsualArithmeticConversions - Performs various conversions that are common to 170/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 171/// routine returns the first non-arithmetic type found. The client is 172/// responsible for emitting appropriate error diagnostics. 173/// FIXME: verify the conversion rules for "complex int" are consistent with 174/// GCC. 175QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 176 bool isCompAssign) { 177 if (!isCompAssign) { 178 UsualUnaryConversions(lhsExpr); 179 UsualUnaryConversions(rhsExpr); 180 } 181 182 // For conversion purposes, we ignore any qualifiers. 183 // For example, "const float" and "float" are equivalent. 184 QualType lhs = 185 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 186 QualType rhs = 187 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 188 189 // If both types are identical, no conversion is needed. 190 if (lhs == rhs) 191 return lhs; 192 193 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 194 // The caller can deal with this (e.g. pointer + int). 195 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 196 return lhs; 197 198 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 199 if (!isCompAssign) { 200 ImpCastExprToType(lhsExpr, destType); 201 ImpCastExprToType(rhsExpr, destType); 202 } 203 return destType; 204} 205 206QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 207 // Perform the usual unary conversions. We do this early so that 208 // integral promotions to "int" can allow us to exit early, in the 209 // lhs == rhs check. Also, for conversion purposes, we ignore any 210 // qualifiers. For example, "const float" and "float" are 211 // equivalent. 212 if (lhs->isPromotableIntegerType()) 213 lhs = Context.IntTy; 214 else 215 lhs = lhs.getUnqualifiedType(); 216 if (rhs->isPromotableIntegerType()) 217 rhs = Context.IntTy; 218 else 219 rhs = rhs.getUnqualifiedType(); 220 221 // If both types are identical, no conversion is needed. 222 if (lhs == rhs) 223 return lhs; 224 225 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 226 // The caller can deal with this (e.g. pointer + int). 227 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 228 return lhs; 229 230 // At this point, we have two different arithmetic types. 231 232 // Handle complex types first (C99 6.3.1.8p1). 233 if (lhs->isComplexType() || rhs->isComplexType()) { 234 // if we have an integer operand, the result is the complex type. 235 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 236 // convert the rhs to the lhs complex type. 237 return lhs; 238 } 239 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 240 // convert the lhs to the rhs complex type. 241 return rhs; 242 } 243 // This handles complex/complex, complex/float, or float/complex. 244 // When both operands are complex, the shorter operand is converted to the 245 // type of the longer, and that is the type of the result. This corresponds 246 // to what is done when combining two real floating-point operands. 247 // The fun begins when size promotion occur across type domains. 248 // From H&S 6.3.4: When one operand is complex and the other is a real 249 // floating-point type, the less precise type is converted, within it's 250 // real or complex domain, to the precision of the other type. For example, 251 // when combining a "long double" with a "double _Complex", the 252 // "double _Complex" is promoted to "long double _Complex". 253 int result = Context.getFloatingTypeOrder(lhs, rhs); 254 255 if (result > 0) { // The left side is bigger, convert rhs. 256 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 257 } else if (result < 0) { // The right side is bigger, convert lhs. 258 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 259 } 260 // At this point, lhs and rhs have the same rank/size. Now, make sure the 261 // domains match. This is a requirement for our implementation, C99 262 // does not require this promotion. 263 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 264 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 265 return rhs; 266 } else { // handle "_Complex double, double". 267 return lhs; 268 } 269 } 270 return lhs; // The domain/size match exactly. 271 } 272 // Now handle "real" floating types (i.e. float, double, long double). 273 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 274 // if we have an integer operand, the result is the real floating type. 275 if (rhs->isIntegerType()) { 276 // convert rhs to the lhs floating point type. 277 return lhs; 278 } 279 if (rhs->isComplexIntegerType()) { 280 // convert rhs to the complex floating point type. 281 return Context.getComplexType(lhs); 282 } 283 if (lhs->isIntegerType()) { 284 // convert lhs to the rhs floating point type. 285 return rhs; 286 } 287 if (lhs->isComplexIntegerType()) { 288 // convert lhs to the complex floating point type. 289 return Context.getComplexType(rhs); 290 } 291 // We have two real floating types, float/complex combos were handled above. 292 // Convert the smaller operand to the bigger result. 293 int result = Context.getFloatingTypeOrder(lhs, rhs); 294 if (result > 0) // convert the rhs 295 return lhs; 296 assert(result < 0 && "illegal float comparison"); 297 return rhs; // convert the lhs 298 } 299 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 300 // Handle GCC complex int extension. 301 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 302 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 303 304 if (lhsComplexInt && rhsComplexInt) { 305 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 306 rhsComplexInt->getElementType()) >= 0) 307 return lhs; // convert the rhs 308 return rhs; 309 } else if (lhsComplexInt && rhs->isIntegerType()) { 310 // convert the rhs to the lhs complex type. 311 return lhs; 312 } else if (rhsComplexInt && lhs->isIntegerType()) { 313 // convert the lhs to the rhs complex type. 314 return rhs; 315 } 316 } 317 // Finally, we have two differing integer types. 318 // The rules for this case are in C99 6.3.1.8 319 int compare = Context.getIntegerTypeOrder(lhs, rhs); 320 bool lhsSigned = lhs->isSignedIntegerType(), 321 rhsSigned = rhs->isSignedIntegerType(); 322 QualType destType; 323 if (lhsSigned == rhsSigned) { 324 // Same signedness; use the higher-ranked type 325 destType = compare >= 0 ? lhs : rhs; 326 } else if (compare != (lhsSigned ? 1 : -1)) { 327 // The unsigned type has greater than or equal rank to the 328 // signed type, so use the unsigned type 329 destType = lhsSigned ? rhs : lhs; 330 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 331 // The two types are different widths; if we are here, that 332 // means the signed type is larger than the unsigned type, so 333 // use the signed type. 334 destType = lhsSigned ? lhs : rhs; 335 } else { 336 // The signed type is higher-ranked than the unsigned type, 337 // but isn't actually any bigger (like unsigned int and long 338 // on most 32-bit systems). Use the unsigned type corresponding 339 // to the signed type. 340 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 341 } 342 return destType; 343} 344 345//===----------------------------------------------------------------------===// 346// Semantic Analysis for various Expression Types 347//===----------------------------------------------------------------------===// 348 349 350/// ActOnStringLiteral - The specified tokens were lexed as pasted string 351/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 352/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 353/// multiple tokens. However, the common case is that StringToks points to one 354/// string. 355/// 356Action::OwningExprResult 357Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 358 assert(NumStringToks && "Must have at least one string!"); 359 360 StringLiteralParser Literal(StringToks, NumStringToks, PP); 361 if (Literal.hadError) 362 return ExprError(); 363 364 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 365 for (unsigned i = 0; i != NumStringToks; ++i) 366 StringTokLocs.push_back(StringToks[i].getLocation()); 367 368 QualType StrTy = Context.CharTy; 369 if (Literal.AnyWide) StrTy = Context.getWCharType(); 370 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 371 372 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 373 if (getLangOptions().CPlusPlus) 374 StrTy.addConst(); 375 376 // Get an array type for the string, according to C99 6.4.5. This includes 377 // the nul terminator character as well as the string length for pascal 378 // strings. 379 StrTy = Context.getConstantArrayType(StrTy, 380 llvm::APInt(32, Literal.GetNumStringChars()+1), 381 ArrayType::Normal, 0); 382 383 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 384 return Owned(StringLiteral::Create(Context, Literal.GetString(), 385 Literal.GetStringLength(), 386 Literal.AnyWide, StrTy, 387 &StringTokLocs[0], 388 StringTokLocs.size())); 389} 390 391/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 392/// CurBlock to VD should cause it to be snapshotted (as we do for auto 393/// variables defined outside the block) or false if this is not needed (e.g. 394/// for values inside the block or for globals). 395/// 396/// FIXME: This will create BlockDeclRefExprs for global variables, 397/// function references, etc which is suboptimal :) and breaks 398/// things like "integer constant expression" tests. 399static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 400 ValueDecl *VD) { 401 // If the value is defined inside the block, we couldn't snapshot it even if 402 // we wanted to. 403 if (CurBlock->TheDecl == VD->getDeclContext()) 404 return false; 405 406 // If this is an enum constant or function, it is constant, don't snapshot. 407 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 408 return false; 409 410 // If this is a reference to an extern, static, or global variable, no need to 411 // snapshot it. 412 // FIXME: What about 'const' variables in C++? 413 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 414 return Var->hasLocalStorage(); 415 416 return true; 417} 418 419 420 421/// ActOnIdentifierExpr - The parser read an identifier in expression context, 422/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 423/// identifier is used in a function call context. 424/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 425/// class or namespace that the identifier must be a member of. 426Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 427 IdentifierInfo &II, 428 bool HasTrailingLParen, 429 const CXXScopeSpec *SS, 430 bool isAddressOfOperand) { 431 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 432 isAddressOfOperand); 433} 434 435/// BuildDeclRefExpr - Build either a DeclRefExpr or a 436/// QualifiedDeclRefExpr based on whether or not SS is a 437/// nested-name-specifier. 438DeclRefExpr * 439Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 440 bool TypeDependent, bool ValueDependent, 441 const CXXScopeSpec *SS) { 442 if (SS && !SS->isEmpty()) { 443 llvm::SmallVector<NestedNameSpecifier, 16> Specs; 444 for (CXXScopeSpec::iterator Spec = SS->begin(), SpecEnd = SS->end(); 445 Spec != SpecEnd; ++Spec) 446 Specs.push_back(NestedNameSpecifier::getFromOpaquePtr(*Spec)); 447 return QualifiedDeclRefExpr::Create(Context, D, Ty, Loc, TypeDependent, 448 ValueDependent, SS->getRange(), 449 &Specs[0], Specs.size()); 450 } else 451 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 452} 453 454/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 455/// variable corresponding to the anonymous union or struct whose type 456/// is Record. 457static Decl *getObjectForAnonymousRecordDecl(RecordDecl *Record) { 458 assert(Record->isAnonymousStructOrUnion() && 459 "Record must be an anonymous struct or union!"); 460 461 // FIXME: Once Decls are directly linked together, this will 462 // be an O(1) operation rather than a slow walk through DeclContext's 463 // vector (which itself will be eliminated). DeclGroups might make 464 // this even better. 465 DeclContext *Ctx = Record->getDeclContext(); 466 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 467 DEnd = Ctx->decls_end(); 468 D != DEnd; ++D) { 469 if (*D == Record) { 470 // The object for the anonymous struct/union directly 471 // follows its type in the list of declarations. 472 ++D; 473 assert(D != DEnd && "Missing object for anonymous record"); 474 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 475 return *D; 476 } 477 } 478 479 assert(false && "Missing object for anonymous record"); 480 return 0; 481} 482 483Sema::OwningExprResult 484Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 485 FieldDecl *Field, 486 Expr *BaseObjectExpr, 487 SourceLocation OpLoc) { 488 assert(Field->getDeclContext()->isRecord() && 489 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 490 && "Field must be stored inside an anonymous struct or union"); 491 492 // Construct the sequence of field member references 493 // we'll have to perform to get to the field in the anonymous 494 // union/struct. The list of members is built from the field 495 // outward, so traverse it backwards to go from an object in 496 // the current context to the field we found. 497 llvm::SmallVector<FieldDecl *, 4> AnonFields; 498 AnonFields.push_back(Field); 499 VarDecl *BaseObject = 0; 500 DeclContext *Ctx = Field->getDeclContext(); 501 do { 502 RecordDecl *Record = cast<RecordDecl>(Ctx); 503 Decl *AnonObject = getObjectForAnonymousRecordDecl(Record); 504 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 505 AnonFields.push_back(AnonField); 506 else { 507 BaseObject = cast<VarDecl>(AnonObject); 508 break; 509 } 510 Ctx = Ctx->getParent(); 511 } while (Ctx->isRecord() && 512 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 513 514 // Build the expression that refers to the base object, from 515 // which we will build a sequence of member references to each 516 // of the anonymous union objects and, eventually, the field we 517 // found via name lookup. 518 bool BaseObjectIsPointer = false; 519 unsigned ExtraQuals = 0; 520 if (BaseObject) { 521 // BaseObject is an anonymous struct/union variable (and is, 522 // therefore, not part of another non-anonymous record). 523 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 524 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 525 SourceLocation()); 526 ExtraQuals 527 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 528 } else if (BaseObjectExpr) { 529 // The caller provided the base object expression. Determine 530 // whether its a pointer and whether it adds any qualifiers to the 531 // anonymous struct/union fields we're looking into. 532 QualType ObjectType = BaseObjectExpr->getType(); 533 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 534 BaseObjectIsPointer = true; 535 ObjectType = ObjectPtr->getPointeeType(); 536 } 537 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 538 } else { 539 // We've found a member of an anonymous struct/union that is 540 // inside a non-anonymous struct/union, so in a well-formed 541 // program our base object expression is "this". 542 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 543 if (!MD->isStatic()) { 544 QualType AnonFieldType 545 = Context.getTagDeclType( 546 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 547 QualType ThisType = Context.getTagDeclType(MD->getParent()); 548 if ((Context.getCanonicalType(AnonFieldType) 549 == Context.getCanonicalType(ThisType)) || 550 IsDerivedFrom(ThisType, AnonFieldType)) { 551 // Our base object expression is "this". 552 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 553 MD->getThisType(Context)); 554 BaseObjectIsPointer = true; 555 } 556 } else { 557 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 558 << Field->getDeclName()); 559 } 560 ExtraQuals = MD->getTypeQualifiers(); 561 } 562 563 if (!BaseObjectExpr) 564 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 565 << Field->getDeclName()); 566 } 567 568 // Build the implicit member references to the field of the 569 // anonymous struct/union. 570 Expr *Result = BaseObjectExpr; 571 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 572 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 573 FI != FIEnd; ++FI) { 574 QualType MemberType = (*FI)->getType(); 575 if (!(*FI)->isMutable()) { 576 unsigned combinedQualifiers 577 = MemberType.getCVRQualifiers() | ExtraQuals; 578 MemberType = MemberType.getQualifiedType(combinedQualifiers); 579 } 580 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 581 OpLoc, MemberType); 582 BaseObjectIsPointer = false; 583 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 584 } 585 586 return Owned(Result); 587} 588 589/// ActOnDeclarationNameExpr - The parser has read some kind of name 590/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 591/// performs lookup on that name and returns an expression that refers 592/// to that name. This routine isn't directly called from the parser, 593/// because the parser doesn't know about DeclarationName. Rather, 594/// this routine is called by ActOnIdentifierExpr, 595/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 596/// which form the DeclarationName from the corresponding syntactic 597/// forms. 598/// 599/// HasTrailingLParen indicates whether this identifier is used in a 600/// function call context. LookupCtx is only used for a C++ 601/// qualified-id (foo::bar) to indicate the class or namespace that 602/// the identifier must be a member of. 603/// 604/// isAddressOfOperand means that this expression is the direct operand 605/// of an address-of operator. This matters because this is the only 606/// situation where a qualified name referencing a non-static member may 607/// appear outside a member function of this class. 608Sema::OwningExprResult 609Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 610 DeclarationName Name, bool HasTrailingLParen, 611 const CXXScopeSpec *SS, 612 bool isAddressOfOperand) { 613 // Could be enum-constant, value decl, instance variable, etc. 614 if (SS && SS->isInvalid()) 615 return ExprError(); 616 617 // C++ [temp.dep.expr]p3: 618 // An id-expression is type-dependent if it contains: 619 // -- a nested-name-specifier that contains a class-name that 620 // names a dependent type. 621 if (SS && isDependentScopeSpecifier(*SS)) { 622 llvm::SmallVector<NestedNameSpecifier, 16> Specs; 623 for (CXXScopeSpec::iterator Spec = SS->begin(), SpecEnd = SS->end(); 624 Spec != SpecEnd; ++Spec) 625 Specs.push_back(NestedNameSpecifier::getFromOpaquePtr(*Spec)); 626 return Owned(UnresolvedDeclRefExpr::Create(Context, Name, Loc, 627 SS->getRange(), &Specs[0], 628 Specs.size())); 629 } 630 631 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 632 false, true, Loc); 633 634 NamedDecl *D = 0; 635 if (Lookup.isAmbiguous()) { 636 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 637 SS && SS->isSet() ? SS->getRange() 638 : SourceRange()); 639 return ExprError(); 640 } else 641 D = Lookup.getAsDecl(); 642 643 // If this reference is in an Objective-C method, then ivar lookup happens as 644 // well. 645 IdentifierInfo *II = Name.getAsIdentifierInfo(); 646 if (II && getCurMethodDecl()) { 647 // There are two cases to handle here. 1) scoped lookup could have failed, 648 // in which case we should look for an ivar. 2) scoped lookup could have 649 // found a decl, but that decl is outside the current instance method (i.e. 650 // a global variable). In these two cases, we do a lookup for an ivar with 651 // this name, if the lookup sucedes, we replace it our current decl. 652 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 653 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 654 ObjCInterfaceDecl *ClassDeclared; 655 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 656 // Check if referencing a field with __attribute__((deprecated)). 657 if (DiagnoseUseOfDecl(IV, Loc)) 658 return ExprError(); 659 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 660 // If a class method attemps to use a free standing ivar, this is 661 // an error. 662 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 663 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 664 << IV->getDeclName()); 665 // If a class method uses a global variable, even if an ivar with 666 // same name exists, use the global. 667 if (!IsClsMethod) { 668 if (IV->getAccessControl() == ObjCIvarDecl::Private && 669 ClassDeclared != IFace) 670 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 671 // FIXME: This should use a new expr for a direct reference, don't turn 672 // this into Self->ivar, just return a BareIVarExpr or something. 673 IdentifierInfo &II = Context.Idents.get("self"); 674 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 675 ObjCIvarRefExpr *MRef = new (Context) ObjCIvarRefExpr(IV, IV->getType(), 676 Loc, static_cast<Expr*>(SelfExpr.release()), 677 true, true); 678 Context.setFieldDecl(IFace, IV, MRef); 679 return Owned(MRef); 680 } 681 } 682 } 683 else if (getCurMethodDecl()->isInstanceMethod()) { 684 // We should warn if a local variable hides an ivar. 685 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 686 ObjCInterfaceDecl *ClassDeclared; 687 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 688 if (IV->getAccessControl() != ObjCIvarDecl::Private || 689 IFace == ClassDeclared) 690 Diag(Loc, diag::warn_ivar_use_hidden)<<IV->getDeclName(); 691 } 692 } 693 // Needed to implement property "super.method" notation. 694 if (D == 0 && II->isStr("super")) { 695 QualType T; 696 697 if (getCurMethodDecl()->isInstanceMethod()) 698 T = Context.getPointerType(Context.getObjCInterfaceType( 699 getCurMethodDecl()->getClassInterface())); 700 else 701 T = Context.getObjCClassType(); 702 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 703 } 704 } 705 706 // Determine whether this name might be a candidate for 707 // argument-dependent lookup. 708 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 709 HasTrailingLParen; 710 711 if (ADL && D == 0) { 712 // We've seen something of the form 713 // 714 // identifier( 715 // 716 // and we did not find any entity by the name 717 // "identifier". However, this identifier is still subject to 718 // argument-dependent lookup, so keep track of the name. 719 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 720 Context.OverloadTy, 721 Loc)); 722 } 723 724 if (D == 0) { 725 // Otherwise, this could be an implicitly declared function reference (legal 726 // in C90, extension in C99). 727 if (HasTrailingLParen && II && 728 !getLangOptions().CPlusPlus) // Not in C++. 729 D = ImplicitlyDefineFunction(Loc, *II, S); 730 else { 731 // If this name wasn't predeclared and if this is not a function call, 732 // diagnose the problem. 733 if (SS && !SS->isEmpty()) 734 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 735 << Name << SS->getRange()); 736 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 737 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 738 return ExprError(Diag(Loc, diag::err_undeclared_use) 739 << Name.getAsString()); 740 else 741 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 742 } 743 } 744 745 // If this is an expression of the form &Class::member, don't build an 746 // implicit member ref, because we want a pointer to the member in general, 747 // not any specific instance's member. 748 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 749 DeclContext *DC = computeDeclContext(*SS); 750 if (D && isa<CXXRecordDecl>(DC)) { 751 QualType DType; 752 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 753 DType = FD->getType().getNonReferenceType(); 754 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 755 DType = Method->getType(); 756 } else if (isa<OverloadedFunctionDecl>(D)) { 757 DType = Context.OverloadTy; 758 } 759 // Could be an inner type. That's diagnosed below, so ignore it here. 760 if (!DType.isNull()) { 761 // The pointer is type- and value-dependent if it points into something 762 // dependent. 763 bool Dependent = false; 764 for (; DC; DC = DC->getParent()) { 765 // FIXME: could stop early at namespace scope. 766 if (DC->isRecord()) { 767 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 768 if (Context.getTypeDeclType(Record)->isDependentType()) { 769 Dependent = true; 770 break; 771 } 772 } 773 } 774 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 775 } 776 } 777 } 778 779 // We may have found a field within an anonymous union or struct 780 // (C++ [class.union]). 781 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 782 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 783 return BuildAnonymousStructUnionMemberReference(Loc, FD); 784 785 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 786 if (!MD->isStatic()) { 787 // C++ [class.mfct.nonstatic]p2: 788 // [...] if name lookup (3.4.1) resolves the name in the 789 // id-expression to a nonstatic nontype member of class X or of 790 // a base class of X, the id-expression is transformed into a 791 // class member access expression (5.2.5) using (*this) (9.3.2) 792 // as the postfix-expression to the left of the '.' operator. 793 DeclContext *Ctx = 0; 794 QualType MemberType; 795 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 796 Ctx = FD->getDeclContext(); 797 MemberType = FD->getType(); 798 799 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 800 MemberType = RefType->getPointeeType(); 801 else if (!FD->isMutable()) { 802 unsigned combinedQualifiers 803 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 804 MemberType = MemberType.getQualifiedType(combinedQualifiers); 805 } 806 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 807 if (!Method->isStatic()) { 808 Ctx = Method->getParent(); 809 MemberType = Method->getType(); 810 } 811 } else if (OverloadedFunctionDecl *Ovl 812 = dyn_cast<OverloadedFunctionDecl>(D)) { 813 for (OverloadedFunctionDecl::function_iterator 814 Func = Ovl->function_begin(), 815 FuncEnd = Ovl->function_end(); 816 Func != FuncEnd; ++Func) { 817 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 818 if (!DMethod->isStatic()) { 819 Ctx = Ovl->getDeclContext(); 820 MemberType = Context.OverloadTy; 821 break; 822 } 823 } 824 } 825 826 if (Ctx && Ctx->isRecord()) { 827 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 828 QualType ThisType = Context.getTagDeclType(MD->getParent()); 829 if ((Context.getCanonicalType(CtxType) 830 == Context.getCanonicalType(ThisType)) || 831 IsDerivedFrom(ThisType, CtxType)) { 832 // Build the implicit member access expression. 833 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 834 MD->getThisType(Context)); 835 return Owned(new (Context) MemberExpr(This, true, D, 836 SourceLocation(), MemberType)); 837 } 838 } 839 } 840 } 841 842 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 843 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 844 if (MD->isStatic()) 845 // "invalid use of member 'x' in static member function" 846 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 847 << FD->getDeclName()); 848 } 849 850 // Any other ways we could have found the field in a well-formed 851 // program would have been turned into implicit member expressions 852 // above. 853 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 854 << FD->getDeclName()); 855 } 856 857 if (isa<TypedefDecl>(D)) 858 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 859 if (isa<ObjCInterfaceDecl>(D)) 860 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 861 if (isa<NamespaceDecl>(D)) 862 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 863 864 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 865 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 866 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 867 false, false, SS)); 868 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 869 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 870 false, false, SS)); 871 ValueDecl *VD = cast<ValueDecl>(D); 872 873 // Check whether this declaration can be used. Note that we suppress 874 // this check when we're going to perform argument-dependent lookup 875 // on this function name, because this might not be the function 876 // that overload resolution actually selects. 877 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 878 return ExprError(); 879 880 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 881 // Warn about constructs like: 882 // if (void *X = foo()) { ... } else { X }. 883 // In the else block, the pointer is always false. 884 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 885 Scope *CheckS = S; 886 while (CheckS) { 887 if (CheckS->isWithinElse() && 888 CheckS->getControlParent()->isDeclScope(Var)) { 889 if (Var->getType()->isBooleanType()) 890 ExprError(Diag(Loc, diag::warn_value_always_false) 891 << Var->getDeclName()); 892 else 893 ExprError(Diag(Loc, diag::warn_value_always_zero) 894 << Var->getDeclName()); 895 break; 896 } 897 898 // Move up one more control parent to check again. 899 CheckS = CheckS->getControlParent(); 900 if (CheckS) 901 CheckS = CheckS->getParent(); 902 } 903 } 904 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 905 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 906 // C99 DR 316 says that, if a function type comes from a 907 // function definition (without a prototype), that type is only 908 // used for checking compatibility. Therefore, when referencing 909 // the function, we pretend that we don't have the full function 910 // type. 911 QualType T = Func->getType(); 912 QualType NoProtoType = T; 913 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 914 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 915 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 916 } 917 } 918 919 // Only create DeclRefExpr's for valid Decl's. 920 if (VD->isInvalidDecl()) 921 return ExprError(); 922 923 // If the identifier reference is inside a block, and it refers to a value 924 // that is outside the block, create a BlockDeclRefExpr instead of a 925 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 926 // the block is formed. 927 // 928 // We do not do this for things like enum constants, global variables, etc, 929 // as they do not get snapshotted. 930 // 931 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 932 // Blocks that have these can't be constant. 933 CurBlock->hasBlockDeclRefExprs = true; 934 935 // The BlocksAttr indicates the variable is bound by-reference. 936 if (VD->getAttr<BlocksAttr>()) 937 return Owned(new (Context) BlockDeclRefExpr(VD, 938 VD->getType().getNonReferenceType(), Loc, true)); 939 940 // Variable will be bound by-copy, make it const within the closure. 941 VD->getType().addConst(); 942 return Owned(new (Context) BlockDeclRefExpr(VD, 943 VD->getType().getNonReferenceType(), Loc, false)); 944 } 945 // If this reference is not in a block or if the referenced variable is 946 // within the block, create a normal DeclRefExpr. 947 948 bool TypeDependent = false; 949 bool ValueDependent = false; 950 if (getLangOptions().CPlusPlus) { 951 // C++ [temp.dep.expr]p3: 952 // An id-expression is type-dependent if it contains: 953 // - an identifier that was declared with a dependent type, 954 if (VD->getType()->isDependentType()) 955 TypeDependent = true; 956 // - FIXME: a template-id that is dependent, 957 // - a conversion-function-id that specifies a dependent type, 958 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 959 Name.getCXXNameType()->isDependentType()) 960 TypeDependent = true; 961 // - a nested-name-specifier that contains a class-name that 962 // names a dependent type. 963 else if (SS && !SS->isEmpty()) { 964 for (DeclContext *DC = computeDeclContext(*SS); 965 DC; DC = DC->getParent()) { 966 // FIXME: could stop early at namespace scope. 967 if (DC->isRecord()) { 968 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 969 if (Context.getTypeDeclType(Record)->isDependentType()) { 970 TypeDependent = true; 971 break; 972 } 973 } 974 } 975 } 976 977 // C++ [temp.dep.constexpr]p2: 978 // 979 // An identifier is value-dependent if it is: 980 // - a name declared with a dependent type, 981 if (TypeDependent) 982 ValueDependent = true; 983 // - the name of a non-type template parameter, 984 else if (isa<NonTypeTemplateParmDecl>(VD)) 985 ValueDependent = true; 986 // - a constant with integral or enumeration type and is 987 // initialized with an expression that is value-dependent 988 // (FIXME!). 989 } 990 991 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 992 TypeDependent, ValueDependent, SS)); 993} 994 995Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 996 tok::TokenKind Kind) { 997 PredefinedExpr::IdentType IT; 998 999 switch (Kind) { 1000 default: assert(0 && "Unknown simple primary expr!"); 1001 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1002 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1003 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1004 } 1005 1006 // Pre-defined identifiers are of type char[x], where x is the length of the 1007 // string. 1008 unsigned Length; 1009 if (FunctionDecl *FD = getCurFunctionDecl()) 1010 Length = FD->getIdentifier()->getLength(); 1011 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1012 Length = MD->getSynthesizedMethodSize(); 1013 else { 1014 Diag(Loc, diag::ext_predef_outside_function); 1015 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1016 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1017 } 1018 1019 1020 llvm::APInt LengthI(32, Length + 1); 1021 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1022 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1023 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1024} 1025 1026Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1027 llvm::SmallString<16> CharBuffer; 1028 CharBuffer.resize(Tok.getLength()); 1029 const char *ThisTokBegin = &CharBuffer[0]; 1030 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1031 1032 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1033 Tok.getLocation(), PP); 1034 if (Literal.hadError()) 1035 return ExprError(); 1036 1037 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1038 1039 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1040 Literal.isWide(), 1041 type, Tok.getLocation())); 1042} 1043 1044Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1045 // Fast path for a single digit (which is quite common). A single digit 1046 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1047 if (Tok.getLength() == 1) { 1048 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1049 unsigned IntSize = Context.Target.getIntWidth(); 1050 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1051 Context.IntTy, Tok.getLocation())); 1052 } 1053 1054 llvm::SmallString<512> IntegerBuffer; 1055 // Add padding so that NumericLiteralParser can overread by one character. 1056 IntegerBuffer.resize(Tok.getLength()+1); 1057 const char *ThisTokBegin = &IntegerBuffer[0]; 1058 1059 // Get the spelling of the token, which eliminates trigraphs, etc. 1060 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1061 1062 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1063 Tok.getLocation(), PP); 1064 if (Literal.hadError) 1065 return ExprError(); 1066 1067 Expr *Res; 1068 1069 if (Literal.isFloatingLiteral()) { 1070 QualType Ty; 1071 if (Literal.isFloat) 1072 Ty = Context.FloatTy; 1073 else if (!Literal.isLong) 1074 Ty = Context.DoubleTy; 1075 else 1076 Ty = Context.LongDoubleTy; 1077 1078 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1079 1080 // isExact will be set by GetFloatValue(). 1081 bool isExact = false; 1082 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1083 &isExact, Ty, Tok.getLocation()); 1084 1085 } else if (!Literal.isIntegerLiteral()) { 1086 return ExprError(); 1087 } else { 1088 QualType Ty; 1089 1090 // long long is a C99 feature. 1091 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1092 Literal.isLongLong) 1093 Diag(Tok.getLocation(), diag::ext_longlong); 1094 1095 // Get the value in the widest-possible width. 1096 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1097 1098 if (Literal.GetIntegerValue(ResultVal)) { 1099 // If this value didn't fit into uintmax_t, warn and force to ull. 1100 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1101 Ty = Context.UnsignedLongLongTy; 1102 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1103 "long long is not intmax_t?"); 1104 } else { 1105 // If this value fits into a ULL, try to figure out what else it fits into 1106 // according to the rules of C99 6.4.4.1p5. 1107 1108 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1109 // be an unsigned int. 1110 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1111 1112 // Check from smallest to largest, picking the smallest type we can. 1113 unsigned Width = 0; 1114 if (!Literal.isLong && !Literal.isLongLong) { 1115 // Are int/unsigned possibilities? 1116 unsigned IntSize = Context.Target.getIntWidth(); 1117 1118 // Does it fit in a unsigned int? 1119 if (ResultVal.isIntN(IntSize)) { 1120 // Does it fit in a signed int? 1121 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1122 Ty = Context.IntTy; 1123 else if (AllowUnsigned) 1124 Ty = Context.UnsignedIntTy; 1125 Width = IntSize; 1126 } 1127 } 1128 1129 // Are long/unsigned long possibilities? 1130 if (Ty.isNull() && !Literal.isLongLong) { 1131 unsigned LongSize = Context.Target.getLongWidth(); 1132 1133 // Does it fit in a unsigned long? 1134 if (ResultVal.isIntN(LongSize)) { 1135 // Does it fit in a signed long? 1136 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1137 Ty = Context.LongTy; 1138 else if (AllowUnsigned) 1139 Ty = Context.UnsignedLongTy; 1140 Width = LongSize; 1141 } 1142 } 1143 1144 // Finally, check long long if needed. 1145 if (Ty.isNull()) { 1146 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1147 1148 // Does it fit in a unsigned long long? 1149 if (ResultVal.isIntN(LongLongSize)) { 1150 // Does it fit in a signed long long? 1151 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1152 Ty = Context.LongLongTy; 1153 else if (AllowUnsigned) 1154 Ty = Context.UnsignedLongLongTy; 1155 Width = LongLongSize; 1156 } 1157 } 1158 1159 // If we still couldn't decide a type, we probably have something that 1160 // does not fit in a signed long long, but has no U suffix. 1161 if (Ty.isNull()) { 1162 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1163 Ty = Context.UnsignedLongLongTy; 1164 Width = Context.Target.getLongLongWidth(); 1165 } 1166 1167 if (ResultVal.getBitWidth() != Width) 1168 ResultVal.trunc(Width); 1169 } 1170 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1171 } 1172 1173 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1174 if (Literal.isImaginary) 1175 Res = new (Context) ImaginaryLiteral(Res, 1176 Context.getComplexType(Res->getType())); 1177 1178 return Owned(Res); 1179} 1180 1181Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1182 SourceLocation R, ExprArg Val) { 1183 Expr *E = (Expr *)Val.release(); 1184 assert((E != 0) && "ActOnParenExpr() missing expr"); 1185 return Owned(new (Context) ParenExpr(L, R, E)); 1186} 1187 1188/// The UsualUnaryConversions() function is *not* called by this routine. 1189/// See C99 6.3.2.1p[2-4] for more details. 1190bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1191 SourceLocation OpLoc, 1192 const SourceRange &ExprRange, 1193 bool isSizeof) { 1194 if (exprType->isDependentType()) 1195 return false; 1196 1197 // C99 6.5.3.4p1: 1198 if (isa<FunctionType>(exprType)) { 1199 // alignof(function) is allowed. 1200 if (isSizeof) 1201 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1202 return false; 1203 } 1204 1205 if (exprType->isVoidType()) { 1206 Diag(OpLoc, diag::ext_sizeof_void_type) 1207 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1208 return false; 1209 } 1210 1211 return RequireCompleteType(OpLoc, exprType, 1212 isSizeof ? diag::err_sizeof_incomplete_type : 1213 diag::err_alignof_incomplete_type, 1214 ExprRange); 1215} 1216 1217bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1218 const SourceRange &ExprRange) { 1219 E = E->IgnoreParens(); 1220 1221 // alignof decl is always ok. 1222 if (isa<DeclRefExpr>(E)) 1223 return false; 1224 1225 // Cannot know anything else if the expression is dependent. 1226 if (E->isTypeDependent()) 1227 return false; 1228 1229 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1230 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { 1231 if (FD->isBitField()) { 1232 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1233 return true; 1234 } 1235 // Other fields are ok. 1236 return false; 1237 } 1238 } 1239 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1240} 1241 1242/// \brief Build a sizeof or alignof expression given a type operand. 1243Action::OwningExprResult 1244Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1245 bool isSizeOf, SourceRange R) { 1246 if (T.isNull()) 1247 return ExprError(); 1248 1249 if (!T->isDependentType() && 1250 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1251 return ExprError(); 1252 1253 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1254 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1255 Context.getSizeType(), OpLoc, 1256 R.getEnd())); 1257} 1258 1259/// \brief Build a sizeof or alignof expression given an expression 1260/// operand. 1261Action::OwningExprResult 1262Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1263 bool isSizeOf, SourceRange R) { 1264 // Verify that the operand is valid. 1265 bool isInvalid = false; 1266 if (E->isTypeDependent()) { 1267 // Delay type-checking for type-dependent expressions. 1268 } else if (!isSizeOf) { 1269 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1270 } else if (E->isBitField()) { // C99 6.5.3.4p1. 1271 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1272 isInvalid = true; 1273 } else { 1274 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1275 } 1276 1277 if (isInvalid) 1278 return ExprError(); 1279 1280 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1281 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1282 Context.getSizeType(), OpLoc, 1283 R.getEnd())); 1284} 1285 1286/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1287/// the same for @c alignof and @c __alignof 1288/// Note that the ArgRange is invalid if isType is false. 1289Action::OwningExprResult 1290Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1291 void *TyOrEx, const SourceRange &ArgRange) { 1292 // If error parsing type, ignore. 1293 if (TyOrEx == 0) return ExprError(); 1294 1295 if (isType) { 1296 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1297 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1298 } 1299 1300 // Get the end location. 1301 Expr *ArgEx = (Expr *)TyOrEx; 1302 Action::OwningExprResult Result 1303 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1304 1305 if (Result.isInvalid()) 1306 DeleteExpr(ArgEx); 1307 1308 return move(Result); 1309} 1310 1311QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1312 if (V->isTypeDependent()) 1313 return Context.DependentTy; 1314 1315 DefaultFunctionArrayConversion(V); 1316 1317 // These operators return the element type of a complex type. 1318 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1319 return CT->getElementType(); 1320 1321 // Otherwise they pass through real integer and floating point types here. 1322 if (V->getType()->isArithmeticType()) 1323 return V->getType(); 1324 1325 // Reject anything else. 1326 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1327 << (isReal ? "__real" : "__imag"); 1328 return QualType(); 1329} 1330 1331 1332 1333Action::OwningExprResult 1334Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1335 tok::TokenKind Kind, ExprArg Input) { 1336 Expr *Arg = (Expr *)Input.get(); 1337 1338 UnaryOperator::Opcode Opc; 1339 switch (Kind) { 1340 default: assert(0 && "Unknown unary op!"); 1341 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1342 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1343 } 1344 1345 if (getLangOptions().CPlusPlus && 1346 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1347 // Which overloaded operator? 1348 OverloadedOperatorKind OverOp = 1349 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1350 1351 // C++ [over.inc]p1: 1352 // 1353 // [...] If the function is a member function with one 1354 // parameter (which shall be of type int) or a non-member 1355 // function with two parameters (the second of which shall be 1356 // of type int), it defines the postfix increment operator ++ 1357 // for objects of that type. When the postfix increment is 1358 // called as a result of using the ++ operator, the int 1359 // argument will have value zero. 1360 Expr *Args[2] = { 1361 Arg, 1362 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1363 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1364 }; 1365 1366 // Build the candidate set for overloading 1367 OverloadCandidateSet CandidateSet; 1368 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1369 1370 // Perform overload resolution. 1371 OverloadCandidateSet::iterator Best; 1372 switch (BestViableFunction(CandidateSet, Best)) { 1373 case OR_Success: { 1374 // We found a built-in operator or an overloaded operator. 1375 FunctionDecl *FnDecl = Best->Function; 1376 1377 if (FnDecl) { 1378 // We matched an overloaded operator. Build a call to that 1379 // operator. 1380 1381 // Convert the arguments. 1382 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1383 if (PerformObjectArgumentInitialization(Arg, Method)) 1384 return ExprError(); 1385 } else { 1386 // Convert the arguments. 1387 if (PerformCopyInitialization(Arg, 1388 FnDecl->getParamDecl(0)->getType(), 1389 "passing")) 1390 return ExprError(); 1391 } 1392 1393 // Determine the result type 1394 QualType ResultTy 1395 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1396 ResultTy = ResultTy.getNonReferenceType(); 1397 1398 // Build the actual expression node. 1399 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1400 SourceLocation()); 1401 UsualUnaryConversions(FnExpr); 1402 1403 Input.release(); 1404 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1405 Args, 2, ResultTy, 1406 OpLoc)); 1407 } else { 1408 // We matched a built-in operator. Convert the arguments, then 1409 // break out so that we will build the appropriate built-in 1410 // operator node. 1411 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1412 "passing")) 1413 return ExprError(); 1414 1415 break; 1416 } 1417 } 1418 1419 case OR_No_Viable_Function: 1420 // No viable function; fall through to handling this as a 1421 // built-in operator, which will produce an error message for us. 1422 break; 1423 1424 case OR_Ambiguous: 1425 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1426 << UnaryOperator::getOpcodeStr(Opc) 1427 << Arg->getSourceRange(); 1428 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1429 return ExprError(); 1430 1431 case OR_Deleted: 1432 Diag(OpLoc, diag::err_ovl_deleted_oper) 1433 << Best->Function->isDeleted() 1434 << UnaryOperator::getOpcodeStr(Opc) 1435 << Arg->getSourceRange(); 1436 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1437 return ExprError(); 1438 } 1439 1440 // Either we found no viable overloaded operator or we matched a 1441 // built-in operator. In either case, fall through to trying to 1442 // build a built-in operation. 1443 } 1444 1445 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1446 Opc == UnaryOperator::PostInc); 1447 if (result.isNull()) 1448 return ExprError(); 1449 Input.release(); 1450 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1451} 1452 1453Action::OwningExprResult 1454Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1455 ExprArg Idx, SourceLocation RLoc) { 1456 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1457 *RHSExp = static_cast<Expr*>(Idx.get()); 1458 1459 if (getLangOptions().CPlusPlus && 1460 (LHSExp->getType()->isRecordType() || 1461 LHSExp->getType()->isEnumeralType() || 1462 RHSExp->getType()->isRecordType() || 1463 RHSExp->getType()->isEnumeralType())) { 1464 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1465 // to the candidate set. 1466 OverloadCandidateSet CandidateSet; 1467 Expr *Args[2] = { LHSExp, RHSExp }; 1468 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1469 SourceRange(LLoc, RLoc)); 1470 1471 // Perform overload resolution. 1472 OverloadCandidateSet::iterator Best; 1473 switch (BestViableFunction(CandidateSet, Best)) { 1474 case OR_Success: { 1475 // We found a built-in operator or an overloaded operator. 1476 FunctionDecl *FnDecl = Best->Function; 1477 1478 if (FnDecl) { 1479 // We matched an overloaded operator. Build a call to that 1480 // operator. 1481 1482 // Convert the arguments. 1483 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1484 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1485 PerformCopyInitialization(RHSExp, 1486 FnDecl->getParamDecl(0)->getType(), 1487 "passing")) 1488 return ExprError(); 1489 } else { 1490 // Convert the arguments. 1491 if (PerformCopyInitialization(LHSExp, 1492 FnDecl->getParamDecl(0)->getType(), 1493 "passing") || 1494 PerformCopyInitialization(RHSExp, 1495 FnDecl->getParamDecl(1)->getType(), 1496 "passing")) 1497 return ExprError(); 1498 } 1499 1500 // Determine the result type 1501 QualType ResultTy 1502 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1503 ResultTy = ResultTy.getNonReferenceType(); 1504 1505 // Build the actual expression node. 1506 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1507 SourceLocation()); 1508 UsualUnaryConversions(FnExpr); 1509 1510 Base.release(); 1511 Idx.release(); 1512 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1513 FnExpr, Args, 2, 1514 ResultTy, LLoc)); 1515 } else { 1516 // We matched a built-in operator. Convert the arguments, then 1517 // break out so that we will build the appropriate built-in 1518 // operator node. 1519 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1520 "passing") || 1521 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1522 "passing")) 1523 return ExprError(); 1524 1525 break; 1526 } 1527 } 1528 1529 case OR_No_Viable_Function: 1530 // No viable function; fall through to handling this as a 1531 // built-in operator, which will produce an error message for us. 1532 break; 1533 1534 case OR_Ambiguous: 1535 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1536 << "[]" 1537 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1538 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1539 return ExprError(); 1540 1541 case OR_Deleted: 1542 Diag(LLoc, diag::err_ovl_deleted_oper) 1543 << Best->Function->isDeleted() 1544 << "[]" 1545 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1546 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1547 return ExprError(); 1548 } 1549 1550 // Either we found no viable overloaded operator or we matched a 1551 // built-in operator. In either case, fall through to trying to 1552 // build a built-in operation. 1553 } 1554 1555 // Perform default conversions. 1556 DefaultFunctionArrayConversion(LHSExp); 1557 DefaultFunctionArrayConversion(RHSExp); 1558 1559 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1560 1561 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1562 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1563 // in the subscript position. As a result, we need to derive the array base 1564 // and index from the expression types. 1565 Expr *BaseExpr, *IndexExpr; 1566 QualType ResultType; 1567 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1568 BaseExpr = LHSExp; 1569 IndexExpr = RHSExp; 1570 ResultType = Context.DependentTy; 1571 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1572 BaseExpr = LHSExp; 1573 IndexExpr = RHSExp; 1574 // FIXME: need to deal with const... 1575 ResultType = PTy->getPointeeType(); 1576 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1577 // Handle the uncommon case of "123[Ptr]". 1578 BaseExpr = RHSExp; 1579 IndexExpr = LHSExp; 1580 // FIXME: need to deal with const... 1581 ResultType = PTy->getPointeeType(); 1582 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1583 BaseExpr = LHSExp; // vectors: V[123] 1584 IndexExpr = RHSExp; 1585 1586 // FIXME: need to deal with const... 1587 ResultType = VTy->getElementType(); 1588 } else { 1589 return ExprError(Diag(LHSExp->getLocStart(), 1590 diag::err_typecheck_subscript_value) << RHSExp->getSourceRange()); 1591 } 1592 // C99 6.5.2.1p1 1593 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1594 return ExprError(Diag(IndexExpr->getLocStart(), 1595 diag::err_typecheck_subscript) << IndexExpr->getSourceRange()); 1596 1597 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 1598 // the following check catches trying to index a pointer to a function (e.g. 1599 // void (*)(int)) and pointers to incomplete types. Functions are not 1600 // objects in C99. 1601 if (!ResultType->isObjectType() && !ResultType->isDependentType()) 1602 return ExprError(Diag(BaseExpr->getLocStart(), 1603 diag::err_typecheck_subscript_not_object) 1604 << BaseExpr->getType() << BaseExpr->getSourceRange()); 1605 1606 Base.release(); 1607 Idx.release(); 1608 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1609 ResultType, RLoc)); 1610} 1611 1612QualType Sema:: 1613CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1614 IdentifierInfo &CompName, SourceLocation CompLoc) { 1615 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1616 1617 // The vector accessor can't exceed the number of elements. 1618 const char *compStr = CompName.getName(); 1619 1620 // This flag determines whether or not the component is one of the four 1621 // special names that indicate a subset of exactly half the elements are 1622 // to be selected. 1623 bool HalvingSwizzle = false; 1624 1625 // This flag determines whether or not CompName has an 's' char prefix, 1626 // indicating that it is a string of hex values to be used as vector indices. 1627 bool HexSwizzle = *compStr == 's'; 1628 1629 // Check that we've found one of the special components, or that the component 1630 // names must come from the same set. 1631 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1632 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1633 HalvingSwizzle = true; 1634 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1635 do 1636 compStr++; 1637 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1638 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1639 do 1640 compStr++; 1641 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1642 } 1643 1644 if (!HalvingSwizzle && *compStr) { 1645 // We didn't get to the end of the string. This means the component names 1646 // didn't come from the same set *or* we encountered an illegal name. 1647 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1648 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1649 return QualType(); 1650 } 1651 1652 // Ensure no component accessor exceeds the width of the vector type it 1653 // operates on. 1654 if (!HalvingSwizzle) { 1655 compStr = CompName.getName(); 1656 1657 if (HexSwizzle) 1658 compStr++; 1659 1660 while (*compStr) { 1661 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1662 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1663 << baseType << SourceRange(CompLoc); 1664 return QualType(); 1665 } 1666 } 1667 } 1668 1669 // If this is a halving swizzle, verify that the base type has an even 1670 // number of elements. 1671 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1672 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1673 << baseType << SourceRange(CompLoc); 1674 return QualType(); 1675 } 1676 1677 // The component accessor looks fine - now we need to compute the actual type. 1678 // The vector type is implied by the component accessor. For example, 1679 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1680 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1681 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1682 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1683 : CompName.getLength(); 1684 if (HexSwizzle) 1685 CompSize--; 1686 1687 if (CompSize == 1) 1688 return vecType->getElementType(); 1689 1690 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1691 // Now look up the TypeDefDecl from the vector type. Without this, 1692 // diagostics look bad. We want extended vector types to appear built-in. 1693 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1694 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1695 return Context.getTypedefType(ExtVectorDecls[i]); 1696 } 1697 return VT; // should never get here (a typedef type should always be found). 1698} 1699 1700static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1701 IdentifierInfo &Member, 1702 const Selector &Sel) { 1703 1704 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(&Member)) 1705 return PD; 1706 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 1707 return OMD; 1708 1709 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1710 E = PDecl->protocol_end(); I != E; ++I) { 1711 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel)) 1712 return D; 1713 } 1714 return 0; 1715} 1716 1717static Decl *FindGetterNameDecl(const ObjCQualifiedIdType *QIdTy, 1718 IdentifierInfo &Member, 1719 const Selector &Sel) { 1720 // Check protocols on qualified interfaces. 1721 Decl *GDecl = 0; 1722 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1723 E = QIdTy->qual_end(); I != E; ++I) { 1724 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1725 GDecl = PD; 1726 break; 1727 } 1728 // Also must look for a getter name which uses property syntax. 1729 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1730 GDecl = OMD; 1731 break; 1732 } 1733 } 1734 if (!GDecl) { 1735 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1736 E = QIdTy->qual_end(); I != E; ++I) { 1737 // Search in the protocol-qualifier list of current protocol. 1738 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel); 1739 if (GDecl) 1740 return GDecl; 1741 } 1742 } 1743 return GDecl; 1744} 1745 1746Action::OwningExprResult 1747Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1748 tok::TokenKind OpKind, SourceLocation MemberLoc, 1749 IdentifierInfo &Member, 1750 DeclTy *ObjCImpDecl) { 1751 Expr *BaseExpr = static_cast<Expr *>(Base.release()); 1752 assert(BaseExpr && "no record expression"); 1753 1754 // Perform default conversions. 1755 DefaultFunctionArrayConversion(BaseExpr); 1756 1757 QualType BaseType = BaseExpr->getType(); 1758 assert(!BaseType.isNull() && "no type for member expression"); 1759 1760 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1761 // must have pointer type, and the accessed type is the pointee. 1762 if (OpKind == tok::arrow) { 1763 if (const PointerType *PT = BaseType->getAsPointerType()) 1764 BaseType = PT->getPointeeType(); 1765 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1766 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1767 MemberLoc, Member)); 1768 else 1769 return ExprError(Diag(MemberLoc, 1770 diag::err_typecheck_member_reference_arrow) 1771 << BaseType << BaseExpr->getSourceRange()); 1772 } 1773 1774 // Handle field access to simple records. This also handles access to fields 1775 // of the ObjC 'id' struct. 1776 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1777 RecordDecl *RDecl = RTy->getDecl(); 1778 if (RequireCompleteType(OpLoc, BaseType, 1779 diag::err_typecheck_incomplete_tag, 1780 BaseExpr->getSourceRange())) 1781 return ExprError(); 1782 1783 // The record definition is complete, now make sure the member is valid. 1784 // FIXME: Qualified name lookup for C++ is a bit more complicated 1785 // than this. 1786 LookupResult Result 1787 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1788 LookupMemberName, false); 1789 1790 NamedDecl *MemberDecl = 0; 1791 if (!Result) 1792 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1793 << &Member << BaseExpr->getSourceRange()); 1794 else if (Result.isAmbiguous()) { 1795 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1796 MemberLoc, BaseExpr->getSourceRange()); 1797 return ExprError(); 1798 } else 1799 MemberDecl = Result; 1800 1801 // If the decl being referenced had an error, return an error for this 1802 // sub-expr without emitting another error, in order to avoid cascading 1803 // error cases. 1804 if (MemberDecl->isInvalidDecl()) 1805 return ExprError(); 1806 1807 // Check the use of this field 1808 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 1809 return ExprError(); 1810 1811 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1812 // We may have found a field within an anonymous union or struct 1813 // (C++ [class.union]). 1814 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1815 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1816 BaseExpr, OpLoc); 1817 1818 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1819 // FIXME: Handle address space modifiers 1820 QualType MemberType = FD->getType(); 1821 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1822 MemberType = Ref->getPointeeType(); 1823 else { 1824 unsigned combinedQualifiers = 1825 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1826 if (FD->isMutable()) 1827 combinedQualifiers &= ~QualType::Const; 1828 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1829 } 1830 1831 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1832 MemberLoc, MemberType)); 1833 } else if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) 1834 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1835 Var, MemberLoc, 1836 Var->getType().getNonReferenceType())); 1837 else if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 1838 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1839 MemberFn, MemberLoc, MemberFn->getType())); 1840 else if (OverloadedFunctionDecl *Ovl 1841 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 1842 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 1843 MemberLoc, Context.OverloadTy)); 1844 else if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 1845 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1846 Enum, MemberLoc, Enum->getType())); 1847 else if (isa<TypeDecl>(MemberDecl)) 1848 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 1849 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1850 1851 // We found a declaration kind that we didn't expect. This is a 1852 // generic error message that tells the user that she can't refer 1853 // to this member with '.' or '->'. 1854 return ExprError(Diag(MemberLoc, 1855 diag::err_typecheck_member_reference_unknown) 1856 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1857 } 1858 1859 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1860 // (*Obj).ivar. 1861 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1862 ObjCInterfaceDecl *ClassDeclared; 1863 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member, 1864 ClassDeclared)) { 1865 // If the decl being referenced had an error, return an error for this 1866 // sub-expr without emitting another error, in order to avoid cascading 1867 // error cases. 1868 if (IV->isInvalidDecl()) 1869 return ExprError(); 1870 1871 // Check whether we can reference this field. 1872 if (DiagnoseUseOfDecl(IV, MemberLoc)) 1873 return ExprError(); 1874 if (IV->getAccessControl() != ObjCIvarDecl::Public) { 1875 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 1876 if (ObjCMethodDecl *MD = getCurMethodDecl()) 1877 ClassOfMethodDecl = MD->getClassInterface(); 1878 else if (ObjCImpDecl && getCurFunctionDecl()) { 1879 // Case of a c-function declared inside an objc implementation. 1880 // FIXME: For a c-style function nested inside an objc implementation 1881 // class, there is no implementation context available, so we pass down 1882 // the context as argument to this routine. Ideally, this context need 1883 // be passed down in the AST node and somehow calculated from the AST 1884 // for a function decl. 1885 Decl *ImplDecl = static_cast<Decl *>(ObjCImpDecl); 1886 if (ObjCImplementationDecl *IMPD = 1887 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 1888 ClassOfMethodDecl = IMPD->getClassInterface(); 1889 else if (ObjCCategoryImplDecl* CatImplClass = 1890 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 1891 ClassOfMethodDecl = CatImplClass->getClassInterface(); 1892 } 1893 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 1894 if (ClassDeclared != IFTy->getDecl() || 1895 ClassOfMethodDecl != ClassDeclared) 1896 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 1897 } 1898 // @protected 1899 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 1900 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 1901 } 1902 1903 ObjCIvarRefExpr *MRef= new (Context) ObjCIvarRefExpr(IV, IV->getType(), 1904 MemberLoc, BaseExpr, 1905 OpKind == tok::arrow); 1906 Context.setFieldDecl(IFTy->getDecl(), IV, MRef); 1907 return Owned(MRef); 1908 } 1909 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1910 << IFTy->getDecl()->getDeclName() << &Member 1911 << BaseExpr->getSourceRange()); 1912 } 1913 1914 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1915 // pointer to a (potentially qualified) interface type. 1916 const PointerType *PTy; 1917 const ObjCInterfaceType *IFTy; 1918 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1919 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1920 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1921 1922 // Search for a declared property first. 1923 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) { 1924 // Check whether we can reference this property. 1925 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1926 return ExprError(); 1927 1928 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1929 MemberLoc, BaseExpr)); 1930 } 1931 1932 // Check protocols on qualified interfaces. 1933 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1934 E = IFTy->qual_end(); I != E; ++I) 1935 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1936 // Check whether we can reference this property. 1937 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1938 return ExprError(); 1939 1940 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1941 MemberLoc, BaseExpr)); 1942 } 1943 1944 // If that failed, look for an "implicit" property by seeing if the nullary 1945 // selector is implemented. 1946 1947 // FIXME: The logic for looking up nullary and unary selectors should be 1948 // shared with the code in ActOnInstanceMessage. 1949 1950 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1951 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1952 1953 // If this reference is in an @implementation, check for 'private' methods. 1954 if (!Getter) 1955 if (ObjCImplementationDecl *ImpDecl = 1956 ObjCImplementations[IFace->getIdentifier()]) 1957 Getter = ImpDecl->getInstanceMethod(Sel); 1958 1959 // Look through local category implementations associated with the class. 1960 if (!Getter) { 1961 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1962 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1963 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1964 } 1965 } 1966 if (Getter) { 1967 // Check if we can reference this property. 1968 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1969 return ExprError(); 1970 } 1971 // If we found a getter then this may be a valid dot-reference, we 1972 // will look for the matching setter, in case it is needed. 1973 Selector SetterSel = 1974 SelectorTable::constructSetterName(PP.getIdentifierTable(), 1975 PP.getSelectorTable(), &Member); 1976 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1977 if (!Setter) { 1978 // If this reference is in an @implementation, also check for 'private' 1979 // methods. 1980 if (ObjCImplementationDecl *ImpDecl = 1981 ObjCImplementations[IFace->getIdentifier()]) 1982 Setter = ImpDecl->getInstanceMethod(SetterSel); 1983 } 1984 // Look through local category implementations associated with the class. 1985 if (!Setter) { 1986 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 1987 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1988 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 1989 } 1990 } 1991 1992 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1993 return ExprError(); 1994 1995 if (Getter || Setter) { 1996 QualType PType; 1997 1998 if (Getter) 1999 PType = Getter->getResultType(); 2000 else { 2001 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2002 E = Setter->param_end(); PI != E; ++PI) 2003 PType = (*PI)->getType(); 2004 } 2005 // FIXME: we must check that the setter has property type. 2006 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2007 Setter, MemberLoc, BaseExpr)); 2008 } 2009 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2010 << &Member << BaseType); 2011 } 2012 // Handle properties on qualified "id" protocols. 2013 const ObjCQualifiedIdType *QIdTy; 2014 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2015 // Check protocols on qualified interfaces. 2016 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2017 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel)) { 2018 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2019 // Check the use of this declaration 2020 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2021 return ExprError(); 2022 2023 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2024 MemberLoc, BaseExpr)); 2025 } 2026 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2027 // Check the use of this method. 2028 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2029 return ExprError(); 2030 2031 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2032 OMD->getResultType(), 2033 OMD, OpLoc, MemberLoc, 2034 NULL, 0)); 2035 } 2036 } 2037 2038 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2039 << &Member << BaseType); 2040 } 2041 // Handle properties on ObjC 'Class' types. 2042 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2043 // Also must look for a getter name which uses property syntax. 2044 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2045 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2046 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2047 ObjCMethodDecl *Getter; 2048 // FIXME: need to also look locally in the implementation. 2049 if ((Getter = IFace->lookupClassMethod(Sel))) { 2050 // Check the use of this method. 2051 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2052 return ExprError(); 2053 } 2054 // If we found a getter then this may be a valid dot-reference, we 2055 // will look for the matching setter, in case it is needed. 2056 Selector SetterSel = 2057 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2058 PP.getSelectorTable(), &Member); 2059 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2060 if (!Setter) { 2061 // If this reference is in an @implementation, also check for 'private' 2062 // methods. 2063 if (ObjCImplementationDecl *ImpDecl = 2064 ObjCImplementations[IFace->getIdentifier()]) 2065 Setter = ImpDecl->getInstanceMethod(SetterSel); 2066 } 2067 // Look through local category implementations associated with the class. 2068 if (!Setter) { 2069 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2070 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2071 Setter = ObjCCategoryImpls[i]->getClassMethod(SetterSel); 2072 } 2073 } 2074 2075 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2076 return ExprError(); 2077 2078 if (Getter || Setter) { 2079 QualType PType; 2080 2081 if (Getter) 2082 PType = Getter->getResultType(); 2083 else { 2084 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2085 E = Setter->param_end(); PI != E; ++PI) 2086 PType = (*PI)->getType(); 2087 } 2088 // FIXME: we must check that the setter has property type. 2089 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2090 Setter, MemberLoc, BaseExpr)); 2091 } 2092 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2093 << &Member << BaseType); 2094 } 2095 } 2096 2097 // Handle 'field access' to vectors, such as 'V.xx'. 2098 if (BaseType->isExtVectorType()) { 2099 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2100 if (ret.isNull()) 2101 return ExprError(); 2102 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2103 MemberLoc)); 2104 } 2105 2106 return ExprError(Diag(MemberLoc, 2107 diag::err_typecheck_member_reference_struct_union) 2108 << BaseType << BaseExpr->getSourceRange()); 2109} 2110 2111/// ConvertArgumentsForCall - Converts the arguments specified in 2112/// Args/NumArgs to the parameter types of the function FDecl with 2113/// function prototype Proto. Call is the call expression itself, and 2114/// Fn is the function expression. For a C++ member function, this 2115/// routine does not attempt to convert the object argument. Returns 2116/// true if the call is ill-formed. 2117bool 2118Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2119 FunctionDecl *FDecl, 2120 const FunctionProtoType *Proto, 2121 Expr **Args, unsigned NumArgs, 2122 SourceLocation RParenLoc) { 2123 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2124 // assignment, to the types of the corresponding parameter, ... 2125 unsigned NumArgsInProto = Proto->getNumArgs(); 2126 unsigned NumArgsToCheck = NumArgs; 2127 bool Invalid = false; 2128 2129 // If too few arguments are available (and we don't have default 2130 // arguments for the remaining parameters), don't make the call. 2131 if (NumArgs < NumArgsInProto) { 2132 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2133 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2134 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2135 // Use default arguments for missing arguments 2136 NumArgsToCheck = NumArgsInProto; 2137 Call->setNumArgs(Context, NumArgsInProto); 2138 } 2139 2140 // If too many are passed and not variadic, error on the extras and drop 2141 // them. 2142 if (NumArgs > NumArgsInProto) { 2143 if (!Proto->isVariadic()) { 2144 Diag(Args[NumArgsInProto]->getLocStart(), 2145 diag::err_typecheck_call_too_many_args) 2146 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2147 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2148 Args[NumArgs-1]->getLocEnd()); 2149 // This deletes the extra arguments. 2150 Call->setNumArgs(Context, NumArgsInProto); 2151 Invalid = true; 2152 } 2153 NumArgsToCheck = NumArgsInProto; 2154 } 2155 2156 // Continue to check argument types (even if we have too few/many args). 2157 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2158 QualType ProtoArgType = Proto->getArgType(i); 2159 2160 Expr *Arg; 2161 if (i < NumArgs) { 2162 Arg = Args[i]; 2163 2164 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2165 ProtoArgType, 2166 diag::err_call_incomplete_argument, 2167 Arg->getSourceRange())) 2168 return true; 2169 2170 // Pass the argument. 2171 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2172 return true; 2173 } else 2174 // We already type-checked the argument, so we know it works. 2175 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2176 QualType ArgType = Arg->getType(); 2177 2178 Call->setArg(i, Arg); 2179 } 2180 2181 // If this is a variadic call, handle args passed through "...". 2182 if (Proto->isVariadic()) { 2183 VariadicCallType CallType = VariadicFunction; 2184 if (Fn->getType()->isBlockPointerType()) 2185 CallType = VariadicBlock; // Block 2186 else if (isa<MemberExpr>(Fn)) 2187 CallType = VariadicMethod; 2188 2189 // Promote the arguments (C99 6.5.2.2p7). 2190 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2191 Expr *Arg = Args[i]; 2192 DefaultVariadicArgumentPromotion(Arg, CallType); 2193 Call->setArg(i, Arg); 2194 } 2195 } 2196 2197 return Invalid; 2198} 2199 2200/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2201/// This provides the location of the left/right parens and a list of comma 2202/// locations. 2203Action::OwningExprResult 2204Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2205 MultiExprArg args, 2206 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2207 unsigned NumArgs = args.size(); 2208 Expr *Fn = static_cast<Expr *>(fn.release()); 2209 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2210 assert(Fn && "no function call expression"); 2211 FunctionDecl *FDecl = NULL; 2212 DeclarationName UnqualifiedName; 2213 2214 if (getLangOptions().CPlusPlus) { 2215 // Determine whether this is a dependent call inside a C++ template, 2216 // in which case we won't do any semantic analysis now. 2217 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 2218 bool Dependent = false; 2219 if (Fn->isTypeDependent()) 2220 Dependent = true; 2221 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2222 Dependent = true; 2223 2224 if (Dependent) 2225 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2226 Context.DependentTy, RParenLoc)); 2227 2228 // Determine whether this is a call to an object (C++ [over.call.object]). 2229 if (Fn->getType()->isRecordType()) 2230 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2231 CommaLocs, RParenLoc)); 2232 2233 // Determine whether this is a call to a member function. 2234 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2235 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2236 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2237 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2238 CommaLocs, RParenLoc)); 2239 } 2240 2241 // If we're directly calling a function, get the appropriate declaration. 2242 DeclRefExpr *DRExpr = NULL; 2243 Expr *FnExpr = Fn; 2244 bool ADL = true; 2245 while (true) { 2246 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2247 FnExpr = IcExpr->getSubExpr(); 2248 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2249 // Parentheses around a function disable ADL 2250 // (C++0x [basic.lookup.argdep]p1). 2251 ADL = false; 2252 FnExpr = PExpr->getSubExpr(); 2253 } else if (isa<UnaryOperator>(FnExpr) && 2254 cast<UnaryOperator>(FnExpr)->getOpcode() 2255 == UnaryOperator::AddrOf) { 2256 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2257 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2258 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2259 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2260 break; 2261 } else if (UnresolvedFunctionNameExpr *DepName 2262 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2263 UnqualifiedName = DepName->getName(); 2264 break; 2265 } else { 2266 // Any kind of name that does not refer to a declaration (or 2267 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2268 ADL = false; 2269 break; 2270 } 2271 } 2272 2273 OverloadedFunctionDecl *Ovl = 0; 2274 if (DRExpr) { 2275 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2276 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2277 } 2278 2279 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2280 // We don't perform ADL for implicit declarations of builtins. 2281 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2282 ADL = false; 2283 2284 // We don't perform ADL in C. 2285 if (!getLangOptions().CPlusPlus) 2286 ADL = false; 2287 2288 if (Ovl || ADL) { 2289 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2290 UnqualifiedName, LParenLoc, Args, 2291 NumArgs, CommaLocs, RParenLoc, ADL); 2292 if (!FDecl) 2293 return ExprError(); 2294 2295 // Update Fn to refer to the actual function selected. 2296 Expr *NewFn = 0; 2297 if (QualifiedDeclRefExpr *QDRExpr 2298 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2299 NewFn = QualifiedDeclRefExpr::Create(Context, FDecl, FDecl->getType(), 2300 QDRExpr->getLocation(), 2301 false, false, 2302 QDRExpr->getQualifierRange(), 2303 QDRExpr->begin(), 2304 QDRExpr->size()); 2305 else 2306 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2307 Fn->getSourceRange().getBegin()); 2308 Fn->Destroy(Context); 2309 Fn = NewFn; 2310 } 2311 } 2312 2313 // Promote the function operand. 2314 UsualUnaryConversions(Fn); 2315 2316 // Make the call expr early, before semantic checks. This guarantees cleanup 2317 // of arguments and function on error. 2318 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2319 Args, NumArgs, 2320 Context.BoolTy, 2321 RParenLoc)); 2322 2323 const FunctionType *FuncT; 2324 if (!Fn->getType()->isBlockPointerType()) { 2325 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2326 // have type pointer to function". 2327 const PointerType *PT = Fn->getType()->getAsPointerType(); 2328 if (PT == 0) 2329 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2330 << Fn->getType() << Fn->getSourceRange()); 2331 FuncT = PT->getPointeeType()->getAsFunctionType(); 2332 } else { // This is a block call. 2333 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2334 getAsFunctionType(); 2335 } 2336 if (FuncT == 0) 2337 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2338 << Fn->getType() << Fn->getSourceRange()); 2339 2340 // Check for a valid return type 2341 if (!FuncT->getResultType()->isVoidType() && 2342 RequireCompleteType(Fn->getSourceRange().getBegin(), 2343 FuncT->getResultType(), 2344 diag::err_call_incomplete_return, 2345 TheCall->getSourceRange())) 2346 return ExprError(); 2347 2348 // We know the result type of the call, set it. 2349 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2350 2351 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2352 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2353 RParenLoc)) 2354 return ExprError(); 2355 } else { 2356 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2357 2358 // Promote the arguments (C99 6.5.2.2p6). 2359 for (unsigned i = 0; i != NumArgs; i++) { 2360 Expr *Arg = Args[i]; 2361 DefaultArgumentPromotion(Arg); 2362 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2363 Arg->getType(), 2364 diag::err_call_incomplete_argument, 2365 Arg->getSourceRange())) 2366 return ExprError(); 2367 TheCall->setArg(i, Arg); 2368 } 2369 } 2370 2371 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2372 if (!Method->isStatic()) 2373 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2374 << Fn->getSourceRange()); 2375 2376 // Do special checking on direct calls to functions. 2377 if (FDecl) 2378 return CheckFunctionCall(FDecl, TheCall.take()); 2379 2380 return Owned(TheCall.take()); 2381} 2382 2383Action::OwningExprResult 2384Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2385 SourceLocation RParenLoc, ExprArg InitExpr) { 2386 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2387 QualType literalType = QualType::getFromOpaquePtr(Ty); 2388 // FIXME: put back this assert when initializers are worked out. 2389 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2390 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2391 2392 if (literalType->isArrayType()) { 2393 if (literalType->isVariableArrayType()) 2394 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2395 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2396 } else if (RequireCompleteType(LParenLoc, literalType, 2397 diag::err_typecheck_decl_incomplete_type, 2398 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2399 return ExprError(); 2400 2401 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2402 DeclarationName(), /*FIXME:DirectInit=*/false)) 2403 return ExprError(); 2404 2405 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2406 if (isFileScope) { // 6.5.2.5p3 2407 if (CheckForConstantInitializer(literalExpr, literalType)) 2408 return ExprError(); 2409 } 2410 InitExpr.release(); 2411 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2412 literalExpr, isFileScope)); 2413} 2414 2415Action::OwningExprResult 2416Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2417 SourceLocation RBraceLoc) { 2418 unsigned NumInit = initlist.size(); 2419 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2420 2421 // Semantic analysis for initializers is done by ActOnDeclarator() and 2422 // CheckInitializer() - it requires knowledge of the object being intialized. 2423 2424 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2425 RBraceLoc); 2426 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2427 return Owned(E); 2428} 2429 2430/// CheckCastTypes - Check type constraints for casting between types. 2431bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2432 UsualUnaryConversions(castExpr); 2433 2434 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2435 // type needs to be scalar. 2436 if (castType->isVoidType()) { 2437 // Cast to void allows any expr type. 2438 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2439 // We can't check any more until template instantiation time. 2440 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2441 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2442 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2443 (castType->isStructureType() || castType->isUnionType())) { 2444 // GCC struct/union extension: allow cast to self. 2445 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2446 << castType << castExpr->getSourceRange(); 2447 } else if (castType->isUnionType()) { 2448 // GCC cast to union extension 2449 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2450 RecordDecl::field_iterator Field, FieldEnd; 2451 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 2452 Field != FieldEnd; ++Field) { 2453 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2454 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2455 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2456 << castExpr->getSourceRange(); 2457 break; 2458 } 2459 } 2460 if (Field == FieldEnd) 2461 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2462 << castExpr->getType() << castExpr->getSourceRange(); 2463 } else { 2464 // Reject any other conversions to non-scalar types. 2465 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2466 << castType << castExpr->getSourceRange(); 2467 } 2468 } else if (!castExpr->getType()->isScalarType() && 2469 !castExpr->getType()->isVectorType()) { 2470 return Diag(castExpr->getLocStart(), 2471 diag::err_typecheck_expect_scalar_operand) 2472 << castExpr->getType() << castExpr->getSourceRange(); 2473 } else if (castExpr->getType()->isVectorType()) { 2474 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2475 return true; 2476 } else if (castType->isVectorType()) { 2477 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2478 return true; 2479 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2480 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2481 } 2482 return false; 2483} 2484 2485bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2486 assert(VectorTy->isVectorType() && "Not a vector type!"); 2487 2488 if (Ty->isVectorType() || Ty->isIntegerType()) { 2489 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2490 return Diag(R.getBegin(), 2491 Ty->isVectorType() ? 2492 diag::err_invalid_conversion_between_vectors : 2493 diag::err_invalid_conversion_between_vector_and_integer) 2494 << VectorTy << Ty << R; 2495 } else 2496 return Diag(R.getBegin(), 2497 diag::err_invalid_conversion_between_vector_and_scalar) 2498 << VectorTy << Ty << R; 2499 2500 return false; 2501} 2502 2503Action::OwningExprResult 2504Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2505 SourceLocation RParenLoc, ExprArg Op) { 2506 assert((Ty != 0) && (Op.get() != 0) && 2507 "ActOnCastExpr(): missing type or expr"); 2508 2509 Expr *castExpr = static_cast<Expr*>(Op.release()); 2510 QualType castType = QualType::getFromOpaquePtr(Ty); 2511 2512 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2513 return ExprError(); 2514 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2515 LParenLoc, RParenLoc)); 2516} 2517 2518/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2519/// In that case, lhs = cond. 2520/// C99 6.5.15 2521QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2522 SourceLocation QuestionLoc) { 2523 UsualUnaryConversions(Cond); 2524 UsualUnaryConversions(LHS); 2525 UsualUnaryConversions(RHS); 2526 QualType CondTy = Cond->getType(); 2527 QualType LHSTy = LHS->getType(); 2528 QualType RHSTy = RHS->getType(); 2529 2530 // first, check the condition. 2531 if (!Cond->isTypeDependent()) { 2532 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2533 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2534 << CondTy; 2535 return QualType(); 2536 } 2537 } 2538 2539 // Now check the two expressions. 2540 if ((LHS && LHS->isTypeDependent()) || (RHS && RHS->isTypeDependent())) 2541 return Context.DependentTy; 2542 2543 // If both operands have arithmetic type, do the usual arithmetic conversions 2544 // to find a common type: C99 6.5.15p3,5. 2545 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2546 UsualArithmeticConversions(LHS, RHS); 2547 return LHS->getType(); 2548 } 2549 2550 // If both operands are the same structure or union type, the result is that 2551 // type. 2552 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2553 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2554 if (LHSRT->getDecl() == RHSRT->getDecl()) 2555 // "If both the operands have structure or union type, the result has 2556 // that type." This implies that CV qualifiers are dropped. 2557 return LHSTy.getUnqualifiedType(); 2558 } 2559 2560 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2561 // The following || allows only one side to be void (a GCC-ism). 2562 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2563 if (!LHSTy->isVoidType()) 2564 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2565 << RHS->getSourceRange(); 2566 if (!RHSTy->isVoidType()) 2567 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2568 << LHS->getSourceRange(); 2569 ImpCastExprToType(LHS, Context.VoidTy); 2570 ImpCastExprToType(RHS, Context.VoidTy); 2571 return Context.VoidTy; 2572 } 2573 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2574 // the type of the other operand." 2575 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2576 Context.isObjCObjectPointerType(LHSTy)) && 2577 RHS->isNullPointerConstant(Context)) { 2578 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2579 return LHSTy; 2580 } 2581 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2582 Context.isObjCObjectPointerType(RHSTy)) && 2583 LHS->isNullPointerConstant(Context)) { 2584 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2585 return RHSTy; 2586 } 2587 2588 // Handle the case where both operands are pointers before we handle null 2589 // pointer constants in case both operands are null pointer constants. 2590 if (const PointerType *LHSPT = LHSTy->getAsPointerType()) { // C99 6.5.15p3,6 2591 if (const PointerType *RHSPT = RHSTy->getAsPointerType()) { 2592 // get the "pointed to" types 2593 QualType lhptee = LHSPT->getPointeeType(); 2594 QualType rhptee = RHSPT->getPointeeType(); 2595 2596 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2597 if (lhptee->isVoidType() && 2598 rhptee->isIncompleteOrObjectType()) { 2599 // Figure out necessary qualifiers (C99 6.5.15p6) 2600 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2601 QualType destType = Context.getPointerType(destPointee); 2602 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2603 ImpCastExprToType(RHS, destType); // promote to void* 2604 return destType; 2605 } 2606 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2607 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2608 QualType destType = Context.getPointerType(destPointee); 2609 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2610 ImpCastExprToType(RHS, destType); // promote to void* 2611 return destType; 2612 } 2613 2614 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2615 // Two identical pointer types are always compatible. 2616 return LHSTy; 2617 } 2618 2619 QualType compositeType = LHSTy; 2620 2621 // If either type is an Objective-C object type then check 2622 // compatibility according to Objective-C. 2623 if (Context.isObjCObjectPointerType(LHSTy) || 2624 Context.isObjCObjectPointerType(RHSTy)) { 2625 // If both operands are interfaces and either operand can be 2626 // assigned to the other, use that type as the composite 2627 // type. This allows 2628 // xxx ? (A*) a : (B*) b 2629 // where B is a subclass of A. 2630 // 2631 // Additionally, as for assignment, if either type is 'id' 2632 // allow silent coercion. Finally, if the types are 2633 // incompatible then make sure to use 'id' as the composite 2634 // type so the result is acceptable for sending messages to. 2635 2636 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2637 // It could return the composite type. 2638 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2639 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2640 if (LHSIface && RHSIface && 2641 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2642 compositeType = LHSTy; 2643 } else if (LHSIface && RHSIface && 2644 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2645 compositeType = RHSTy; 2646 } else if (Context.isObjCIdStructType(lhptee) || 2647 Context.isObjCIdStructType(rhptee)) { 2648 compositeType = Context.getObjCIdType(); 2649 } else { 2650 Diag(QuestionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2651 << LHSTy << RHSTy 2652 << LHS->getSourceRange() << RHS->getSourceRange(); 2653 QualType incompatTy = Context.getObjCIdType(); 2654 ImpCastExprToType(LHS, incompatTy); 2655 ImpCastExprToType(RHS, incompatTy); 2656 return incompatTy; 2657 } 2658 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2659 rhptee.getUnqualifiedType())) { 2660 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2661 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2662 // In this situation, we assume void* type. No especially good 2663 // reason, but this is what gcc does, and we do have to pick 2664 // to get a consistent AST. 2665 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2666 ImpCastExprToType(LHS, incompatTy); 2667 ImpCastExprToType(RHS, incompatTy); 2668 return incompatTy; 2669 } 2670 // The pointer types are compatible. 2671 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2672 // differently qualified versions of compatible types, the result type is 2673 // a pointer to an appropriately qualified version of the *composite* 2674 // type. 2675 // FIXME: Need to calculate the composite type. 2676 // FIXME: Need to add qualifiers 2677 ImpCastExprToType(LHS, compositeType); 2678 ImpCastExprToType(RHS, compositeType); 2679 return compositeType; 2680 } 2681 } 2682 2683 // Selection between block pointer types is ok as long as they are the same. 2684 if (LHSTy->isBlockPointerType() && RHSTy->isBlockPointerType() && 2685 Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) 2686 return LHSTy; 2687 2688 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2689 // evaluates to "struct objc_object *" (and is handled above when comparing 2690 // id with statically typed objects). 2691 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 2692 // GCC allows qualified id and any Objective-C type to devolve to 2693 // id. Currently localizing to here until clear this should be 2694 // part of ObjCQualifiedIdTypesAreCompatible. 2695 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 2696 (LHSTy->isObjCQualifiedIdType() && 2697 Context.isObjCObjectPointerType(RHSTy)) || 2698 (RHSTy->isObjCQualifiedIdType() && 2699 Context.isObjCObjectPointerType(LHSTy))) { 2700 // FIXME: This is not the correct composite type. This only 2701 // happens to work because id can more or less be used anywhere, 2702 // however this may change the type of method sends. 2703 // FIXME: gcc adds some type-checking of the arguments and emits 2704 // (confusing) incompatible comparison warnings in some 2705 // cases. Investigate. 2706 QualType compositeType = Context.getObjCIdType(); 2707 ImpCastExprToType(LHS, compositeType); 2708 ImpCastExprToType(RHS, compositeType); 2709 return compositeType; 2710 } 2711 } 2712 2713 // Otherwise, the operands are not compatible. 2714 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2715 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2716 return QualType(); 2717} 2718 2719/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2720/// in the case of a the GNU conditional expr extension. 2721Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2722 SourceLocation ColonLoc, 2723 ExprArg Cond, ExprArg LHS, 2724 ExprArg RHS) { 2725 Expr *CondExpr = (Expr *) Cond.get(); 2726 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2727 2728 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2729 // was the condition. 2730 bool isLHSNull = LHSExpr == 0; 2731 if (isLHSNull) 2732 LHSExpr = CondExpr; 2733 2734 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2735 RHSExpr, QuestionLoc); 2736 if (result.isNull()) 2737 return ExprError(); 2738 2739 Cond.release(); 2740 LHS.release(); 2741 RHS.release(); 2742 return Owned(new (Context) ConditionalOperator(CondExpr, 2743 isLHSNull ? 0 : LHSExpr, 2744 RHSExpr, result)); 2745} 2746 2747 2748// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2749// being closely modeled after the C99 spec:-). The odd characteristic of this 2750// routine is it effectively iqnores the qualifiers on the top level pointee. 2751// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2752// FIXME: add a couple examples in this comment. 2753Sema::AssignConvertType 2754Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2755 QualType lhptee, rhptee; 2756 2757 // get the "pointed to" type (ignoring qualifiers at the top level) 2758 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2759 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2760 2761 // make sure we operate on the canonical type 2762 lhptee = Context.getCanonicalType(lhptee); 2763 rhptee = Context.getCanonicalType(rhptee); 2764 2765 AssignConvertType ConvTy = Compatible; 2766 2767 // C99 6.5.16.1p1: This following citation is common to constraints 2768 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2769 // qualifiers of the type *pointed to* by the right; 2770 // FIXME: Handle ExtQualType 2771 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2772 ConvTy = CompatiblePointerDiscardsQualifiers; 2773 2774 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2775 // incomplete type and the other is a pointer to a qualified or unqualified 2776 // version of void... 2777 if (lhptee->isVoidType()) { 2778 if (rhptee->isIncompleteOrObjectType()) 2779 return ConvTy; 2780 2781 // As an extension, we allow cast to/from void* to function pointer. 2782 assert(rhptee->isFunctionType()); 2783 return FunctionVoidPointer; 2784 } 2785 2786 if (rhptee->isVoidType()) { 2787 if (lhptee->isIncompleteOrObjectType()) 2788 return ConvTy; 2789 2790 // As an extension, we allow cast to/from void* to function pointer. 2791 assert(lhptee->isFunctionType()); 2792 return FunctionVoidPointer; 2793 } 2794 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2795 // unqualified versions of compatible types, ... 2796 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2797 rhptee.getUnqualifiedType())) 2798 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 2799 return ConvTy; 2800} 2801 2802/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2803/// block pointer types are compatible or whether a block and normal pointer 2804/// are compatible. It is more restrict than comparing two function pointer 2805// types. 2806Sema::AssignConvertType 2807Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2808 QualType rhsType) { 2809 QualType lhptee, rhptee; 2810 2811 // get the "pointed to" type (ignoring qualifiers at the top level) 2812 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2813 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2814 2815 // make sure we operate on the canonical type 2816 lhptee = Context.getCanonicalType(lhptee); 2817 rhptee = Context.getCanonicalType(rhptee); 2818 2819 AssignConvertType ConvTy = Compatible; 2820 2821 // For blocks we enforce that qualifiers are identical. 2822 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2823 ConvTy = CompatiblePointerDiscardsQualifiers; 2824 2825 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2826 return IncompatibleBlockPointer; 2827 return ConvTy; 2828} 2829 2830/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2831/// has code to accommodate several GCC extensions when type checking 2832/// pointers. Here are some objectionable examples that GCC considers warnings: 2833/// 2834/// int a, *pint; 2835/// short *pshort; 2836/// struct foo *pfoo; 2837/// 2838/// pint = pshort; // warning: assignment from incompatible pointer type 2839/// a = pint; // warning: assignment makes integer from pointer without a cast 2840/// pint = a; // warning: assignment makes pointer from integer without a cast 2841/// pint = pfoo; // warning: assignment from incompatible pointer type 2842/// 2843/// As a result, the code for dealing with pointers is more complex than the 2844/// C99 spec dictates. 2845/// 2846Sema::AssignConvertType 2847Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2848 // Get canonical types. We're not formatting these types, just comparing 2849 // them. 2850 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2851 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2852 2853 if (lhsType == rhsType) 2854 return Compatible; // Common case: fast path an exact match. 2855 2856 // If the left-hand side is a reference type, then we are in a 2857 // (rare!) case where we've allowed the use of references in C, 2858 // e.g., as a parameter type in a built-in function. In this case, 2859 // just make sure that the type referenced is compatible with the 2860 // right-hand side type. The caller is responsible for adjusting 2861 // lhsType so that the resulting expression does not have reference 2862 // type. 2863 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2864 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2865 return Compatible; 2866 return Incompatible; 2867 } 2868 2869 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 2870 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 2871 return Compatible; 2872 // Relax integer conversions like we do for pointers below. 2873 if (rhsType->isIntegerType()) 2874 return IntToPointer; 2875 if (lhsType->isIntegerType()) 2876 return PointerToInt; 2877 return IncompatibleObjCQualifiedId; 2878 } 2879 2880 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2881 // For ExtVector, allow vector splats; float -> <n x float> 2882 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2883 if (LV->getElementType() == rhsType) 2884 return Compatible; 2885 2886 // If we are allowing lax vector conversions, and LHS and RHS are both 2887 // vectors, the total size only needs to be the same. This is a bitcast; 2888 // no bits are changed but the result type is different. 2889 if (getLangOptions().LaxVectorConversions && 2890 lhsType->isVectorType() && rhsType->isVectorType()) { 2891 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2892 return IncompatibleVectors; 2893 } 2894 return Incompatible; 2895 } 2896 2897 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2898 return Compatible; 2899 2900 if (isa<PointerType>(lhsType)) { 2901 if (rhsType->isIntegerType()) 2902 return IntToPointer; 2903 2904 if (isa<PointerType>(rhsType)) 2905 return CheckPointerTypesForAssignment(lhsType, rhsType); 2906 2907 if (rhsType->getAsBlockPointerType()) { 2908 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2909 return Compatible; 2910 2911 // Treat block pointers as objects. 2912 if (getLangOptions().ObjC1 && 2913 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2914 return Compatible; 2915 } 2916 return Incompatible; 2917 } 2918 2919 if (isa<BlockPointerType>(lhsType)) { 2920 if (rhsType->isIntegerType()) 2921 return IntToBlockPointer; 2922 2923 // Treat block pointers as objects. 2924 if (getLangOptions().ObjC1 && 2925 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2926 return Compatible; 2927 2928 if (rhsType->isBlockPointerType()) 2929 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2930 2931 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2932 if (RHSPT->getPointeeType()->isVoidType()) 2933 return Compatible; 2934 } 2935 return Incompatible; 2936 } 2937 2938 if (isa<PointerType>(rhsType)) { 2939 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2940 if (lhsType == Context.BoolTy) 2941 return Compatible; 2942 2943 if (lhsType->isIntegerType()) 2944 return PointerToInt; 2945 2946 if (isa<PointerType>(lhsType)) 2947 return CheckPointerTypesForAssignment(lhsType, rhsType); 2948 2949 if (isa<BlockPointerType>(lhsType) && 2950 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2951 return Compatible; 2952 return Incompatible; 2953 } 2954 2955 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 2956 if (Context.typesAreCompatible(lhsType, rhsType)) 2957 return Compatible; 2958 } 2959 return Incompatible; 2960} 2961 2962Sema::AssignConvertType 2963Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2964 if (getLangOptions().CPlusPlus) { 2965 if (!lhsType->isRecordType()) { 2966 // C++ 5.17p3: If the left operand is not of class type, the 2967 // expression is implicitly converted (C++ 4) to the 2968 // cv-unqualified type of the left operand. 2969 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 2970 "assigning")) 2971 return Incompatible; 2972 else 2973 return Compatible; 2974 } 2975 2976 // FIXME: Currently, we fall through and treat C++ classes like C 2977 // structures. 2978 } 2979 2980 // C99 6.5.16.1p1: the left operand is a pointer and the right is 2981 // a null pointer constant. 2982 if ((lhsType->isPointerType() || 2983 lhsType->isObjCQualifiedIdType() || 2984 lhsType->isBlockPointerType()) 2985 && rExpr->isNullPointerConstant(Context)) { 2986 ImpCastExprToType(rExpr, lhsType); 2987 return Compatible; 2988 } 2989 2990 // This check seems unnatural, however it is necessary to ensure the proper 2991 // conversion of functions/arrays. If the conversion were done for all 2992 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 2993 // expressions that surpress this implicit conversion (&, sizeof). 2994 // 2995 // Suppress this for references: C++ 8.5.3p5. 2996 if (!lhsType->isReferenceType()) 2997 DefaultFunctionArrayConversion(rExpr); 2998 2999 Sema::AssignConvertType result = 3000 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3001 3002 // C99 6.5.16.1p2: The value of the right operand is converted to the 3003 // type of the assignment expression. 3004 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3005 // so that we can use references in built-in functions even in C. 3006 // The getNonReferenceType() call makes sure that the resulting expression 3007 // does not have reference type. 3008 if (rExpr->getType() != lhsType) 3009 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3010 return result; 3011} 3012 3013Sema::AssignConvertType 3014Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 3015 return CheckAssignmentConstraints(lhsType, rhsType); 3016} 3017 3018QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3019 Diag(Loc, diag::err_typecheck_invalid_operands) 3020 << lex->getType() << rex->getType() 3021 << lex->getSourceRange() << rex->getSourceRange(); 3022 return QualType(); 3023} 3024 3025inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3026 Expr *&rex) { 3027 // For conversion purposes, we ignore any qualifiers. 3028 // For example, "const float" and "float" are equivalent. 3029 QualType lhsType = 3030 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3031 QualType rhsType = 3032 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3033 3034 // If the vector types are identical, return. 3035 if (lhsType == rhsType) 3036 return lhsType; 3037 3038 // Handle the case of a vector & extvector type of the same size and element 3039 // type. It would be nice if we only had one vector type someday. 3040 if (getLangOptions().LaxVectorConversions) { 3041 // FIXME: Should we warn here? 3042 if (const VectorType *LV = lhsType->getAsVectorType()) { 3043 if (const VectorType *RV = rhsType->getAsVectorType()) 3044 if (LV->getElementType() == RV->getElementType() && 3045 LV->getNumElements() == RV->getNumElements()) { 3046 return lhsType->isExtVectorType() ? lhsType : rhsType; 3047 } 3048 } 3049 } 3050 3051 // If the lhs is an extended vector and the rhs is a scalar of the same type 3052 // or a literal, promote the rhs to the vector type. 3053 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3054 QualType eltType = V->getElementType(); 3055 3056 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3057 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3058 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3059 ImpCastExprToType(rex, lhsType); 3060 return lhsType; 3061 } 3062 } 3063 3064 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3065 // promote the lhs to the vector type. 3066 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3067 QualType eltType = V->getElementType(); 3068 3069 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3070 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3071 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3072 ImpCastExprToType(lex, rhsType); 3073 return rhsType; 3074 } 3075 } 3076 3077 // You cannot convert between vector values of different size. 3078 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3079 << lex->getType() << rex->getType() 3080 << lex->getSourceRange() << rex->getSourceRange(); 3081 return QualType(); 3082} 3083 3084inline QualType Sema::CheckMultiplyDivideOperands( 3085 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3086{ 3087 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3088 return CheckVectorOperands(Loc, lex, rex); 3089 3090 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3091 3092 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3093 return compType; 3094 return InvalidOperands(Loc, lex, rex); 3095} 3096 3097inline QualType Sema::CheckRemainderOperands( 3098 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3099{ 3100 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3101 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3102 return CheckVectorOperands(Loc, lex, rex); 3103 return InvalidOperands(Loc, lex, rex); 3104 } 3105 3106 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3107 3108 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3109 return compType; 3110 return InvalidOperands(Loc, lex, rex); 3111} 3112 3113inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3114 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3115{ 3116 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3117 return CheckVectorOperands(Loc, lex, rex); 3118 3119 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3120 3121 // handle the common case first (both operands are arithmetic). 3122 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3123 return compType; 3124 3125 // Put any potential pointer into PExp 3126 Expr* PExp = lex, *IExp = rex; 3127 if (IExp->getType()->isPointerType()) 3128 std::swap(PExp, IExp); 3129 3130 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 3131 if (IExp->getType()->isIntegerType()) { 3132 // Check for arithmetic on pointers to incomplete types 3133 if (!PTy->getPointeeType()->isObjectType()) { 3134 if (PTy->getPointeeType()->isVoidType()) { 3135 if (getLangOptions().CPlusPlus) { 3136 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3137 << lex->getSourceRange() << rex->getSourceRange(); 3138 return QualType(); 3139 } 3140 3141 // GNU extension: arithmetic on pointer to void 3142 Diag(Loc, diag::ext_gnu_void_ptr) 3143 << lex->getSourceRange() << rex->getSourceRange(); 3144 } else if (PTy->getPointeeType()->isFunctionType()) { 3145 if (getLangOptions().CPlusPlus) { 3146 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3147 << lex->getType() << lex->getSourceRange(); 3148 return QualType(); 3149 } 3150 3151 // GNU extension: arithmetic on pointer to function 3152 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3153 << lex->getType() << lex->getSourceRange(); 3154 } else { 3155 RequireCompleteType(Loc, PTy->getPointeeType(), 3156 diag::err_typecheck_arithmetic_incomplete_type, 3157 lex->getSourceRange(), SourceRange(), 3158 lex->getType()); 3159 return QualType(); 3160 } 3161 } 3162 return PExp->getType(); 3163 } 3164 } 3165 3166 return InvalidOperands(Loc, lex, rex); 3167} 3168 3169// C99 6.5.6 3170QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3171 SourceLocation Loc, bool isCompAssign) { 3172 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3173 return CheckVectorOperands(Loc, lex, rex); 3174 3175 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3176 3177 // Enforce type constraints: C99 6.5.6p3. 3178 3179 // Handle the common case first (both operands are arithmetic). 3180 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3181 return compType; 3182 3183 // Either ptr - int or ptr - ptr. 3184 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3185 QualType lpointee = LHSPTy->getPointeeType(); 3186 3187 // The LHS must be an object type, not incomplete, function, etc. 3188 if (!lpointee->isObjectType()) { 3189 // Handle the GNU void* extension. 3190 if (lpointee->isVoidType()) { 3191 Diag(Loc, diag::ext_gnu_void_ptr) 3192 << lex->getSourceRange() << rex->getSourceRange(); 3193 } else if (lpointee->isFunctionType()) { 3194 if (getLangOptions().CPlusPlus) { 3195 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3196 << lex->getType() << lex->getSourceRange(); 3197 return QualType(); 3198 } 3199 3200 // GNU extension: arithmetic on pointer to function 3201 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3202 << lex->getType() << lex->getSourceRange(); 3203 } else { 3204 Diag(Loc, diag::err_typecheck_sub_ptr_object) 3205 << lex->getType() << lex->getSourceRange(); 3206 return QualType(); 3207 } 3208 } 3209 3210 // The result type of a pointer-int computation is the pointer type. 3211 if (rex->getType()->isIntegerType()) 3212 return lex->getType(); 3213 3214 // Handle pointer-pointer subtractions. 3215 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3216 QualType rpointee = RHSPTy->getPointeeType(); 3217 3218 // RHS must be an object type, unless void (GNU). 3219 if (!rpointee->isObjectType()) { 3220 // Handle the GNU void* extension. 3221 if (rpointee->isVoidType()) { 3222 if (!lpointee->isVoidType()) 3223 Diag(Loc, diag::ext_gnu_void_ptr) 3224 << lex->getSourceRange() << rex->getSourceRange(); 3225 } else if (rpointee->isFunctionType()) { 3226 if (getLangOptions().CPlusPlus) { 3227 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3228 << rex->getType() << rex->getSourceRange(); 3229 return QualType(); 3230 } 3231 3232 // GNU extension: arithmetic on pointer to function 3233 if (!lpointee->isFunctionType()) 3234 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3235 << lex->getType() << lex->getSourceRange(); 3236 } else { 3237 Diag(Loc, diag::err_typecheck_sub_ptr_object) 3238 << rex->getType() << rex->getSourceRange(); 3239 return QualType(); 3240 } 3241 } 3242 3243 // Pointee types must be compatible. 3244 if (!Context.typesAreCompatible( 3245 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3246 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3247 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3248 << lex->getType() << rex->getType() 3249 << lex->getSourceRange() << rex->getSourceRange(); 3250 return QualType(); 3251 } 3252 3253 return Context.getPointerDiffType(); 3254 } 3255 } 3256 3257 return InvalidOperands(Loc, lex, rex); 3258} 3259 3260// C99 6.5.7 3261QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3262 bool isCompAssign) { 3263 // C99 6.5.7p2: Each of the operands shall have integer type. 3264 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3265 return InvalidOperands(Loc, lex, rex); 3266 3267 // Shifts don't perform usual arithmetic conversions, they just do integer 3268 // promotions on each operand. C99 6.5.7p3 3269 if (!isCompAssign) 3270 UsualUnaryConversions(lex); 3271 UsualUnaryConversions(rex); 3272 3273 // "The type of the result is that of the promoted left operand." 3274 return lex->getType(); 3275} 3276 3277// C99 6.5.8 3278QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3279 bool isRelational) { 3280 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3281 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3282 3283 // C99 6.5.8p3 / C99 6.5.9p4 3284 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3285 UsualArithmeticConversions(lex, rex); 3286 else { 3287 UsualUnaryConversions(lex); 3288 UsualUnaryConversions(rex); 3289 } 3290 QualType lType = lex->getType(); 3291 QualType rType = rex->getType(); 3292 3293 if (!lType->isFloatingType()) { 3294 // For non-floating point types, check for self-comparisons of the form 3295 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3296 // often indicate logic errors in the program. 3297 // NOTE: Don't warn about comparisons of enum constants. These can arise 3298 // from macro expansions, and are usually quite deliberate. 3299 Expr *LHSStripped = lex->IgnoreParens(); 3300 Expr *RHSStripped = rex->IgnoreParens(); 3301 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3302 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3303 if (DRL->getDecl() == DRR->getDecl() && 3304 !isa<EnumConstantDecl>(DRL->getDecl())) 3305 Diag(Loc, diag::warn_selfcomparison); 3306 3307 if (isa<CastExpr>(LHSStripped)) 3308 LHSStripped = LHSStripped->IgnoreParenCasts(); 3309 if (isa<CastExpr>(RHSStripped)) 3310 RHSStripped = RHSStripped->IgnoreParenCasts(); 3311 3312 // Warn about comparisons against a string constant (unless the other 3313 // operand is null), the user probably wants strcmp. 3314 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3315 !RHSStripped->isNullPointerConstant(Context)) 3316 Diag(Loc, diag::warn_stringcompare) << lex->getSourceRange(); 3317 else if ((isa<StringLiteral>(RHSStripped) || 3318 isa<ObjCEncodeExpr>(RHSStripped)) && 3319 !LHSStripped->isNullPointerConstant(Context)) 3320 Diag(Loc, diag::warn_stringcompare) << rex->getSourceRange(); 3321 } 3322 3323 // The result of comparisons is 'bool' in C++, 'int' in C. 3324 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3325 3326 if (isRelational) { 3327 if (lType->isRealType() && rType->isRealType()) 3328 return ResultTy; 3329 } else { 3330 // Check for comparisons of floating point operands using != and ==. 3331 if (lType->isFloatingType()) { 3332 assert(rType->isFloatingType()); 3333 CheckFloatComparison(Loc,lex,rex); 3334 } 3335 3336 if (lType->isArithmeticType() && rType->isArithmeticType()) 3337 return ResultTy; 3338 } 3339 3340 bool LHSIsNull = lex->isNullPointerConstant(Context); 3341 bool RHSIsNull = rex->isNullPointerConstant(Context); 3342 3343 // All of the following pointer related warnings are GCC extensions, except 3344 // when handling null pointer constants. One day, we can consider making them 3345 // errors (when -pedantic-errors is enabled). 3346 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3347 QualType LCanPointeeTy = 3348 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3349 QualType RCanPointeeTy = 3350 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3351 3352 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3353 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3354 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3355 RCanPointeeTy.getUnqualifiedType()) && 3356 !Context.areComparableObjCPointerTypes(lType, rType)) { 3357 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3358 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3359 } 3360 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3361 return ResultTy; 3362 } 3363 // Handle block pointer types. 3364 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 3365 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3366 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3367 3368 if (!LHSIsNull && !RHSIsNull && 3369 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3370 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3371 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3372 } 3373 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3374 return ResultTy; 3375 } 3376 // Allow block pointers to be compared with null pointer constants. 3377 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3378 (lType->isPointerType() && rType->isBlockPointerType())) { 3379 if (!LHSIsNull && !RHSIsNull) { 3380 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3381 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3382 } 3383 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3384 return ResultTy; 3385 } 3386 3387 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3388 if (lType->isPointerType() || rType->isPointerType()) { 3389 const PointerType *LPT = lType->getAsPointerType(); 3390 const PointerType *RPT = rType->getAsPointerType(); 3391 bool LPtrToVoid = LPT ? 3392 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3393 bool RPtrToVoid = RPT ? 3394 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3395 3396 if (!LPtrToVoid && !RPtrToVoid && 3397 !Context.typesAreCompatible(lType, rType)) { 3398 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3399 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3400 ImpCastExprToType(rex, lType); 3401 return ResultTy; 3402 } 3403 ImpCastExprToType(rex, lType); 3404 return ResultTy; 3405 } 3406 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3407 ImpCastExprToType(rex, lType); 3408 return ResultTy; 3409 } else { 3410 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3411 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3412 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3413 ImpCastExprToType(rex, lType); 3414 return ResultTy; 3415 } 3416 } 3417 } 3418 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3419 rType->isIntegerType()) { 3420 if (!RHSIsNull) 3421 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3422 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3423 ImpCastExprToType(rex, lType); // promote the integer to pointer 3424 return ResultTy; 3425 } 3426 if (lType->isIntegerType() && 3427 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3428 if (!LHSIsNull) 3429 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3430 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3431 ImpCastExprToType(lex, rType); // promote the integer to pointer 3432 return ResultTy; 3433 } 3434 // Handle block pointers. 3435 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3436 if (!RHSIsNull) 3437 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3438 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3439 ImpCastExprToType(rex, lType); // promote the integer to pointer 3440 return ResultTy; 3441 } 3442 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3443 if (!LHSIsNull) 3444 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3445 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3446 ImpCastExprToType(lex, rType); // promote the integer to pointer 3447 return ResultTy; 3448 } 3449 return InvalidOperands(Loc, lex, rex); 3450} 3451 3452/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3453/// operates on extended vector types. Instead of producing an IntTy result, 3454/// like a scalar comparison, a vector comparison produces a vector of integer 3455/// types. 3456QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3457 SourceLocation Loc, 3458 bool isRelational) { 3459 // Check to make sure we're operating on vectors of the same type and width, 3460 // Allowing one side to be a scalar of element type. 3461 QualType vType = CheckVectorOperands(Loc, lex, rex); 3462 if (vType.isNull()) 3463 return vType; 3464 3465 QualType lType = lex->getType(); 3466 QualType rType = rex->getType(); 3467 3468 // For non-floating point types, check for self-comparisons of the form 3469 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3470 // often indicate logic errors in the program. 3471 if (!lType->isFloatingType()) { 3472 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3473 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3474 if (DRL->getDecl() == DRR->getDecl()) 3475 Diag(Loc, diag::warn_selfcomparison); 3476 } 3477 3478 // Check for comparisons of floating point operands using != and ==. 3479 if (!isRelational && lType->isFloatingType()) { 3480 assert (rType->isFloatingType()); 3481 CheckFloatComparison(Loc,lex,rex); 3482 } 3483 3484 // Return the type for the comparison, which is the same as vector type for 3485 // integer vectors, or an integer type of identical size and number of 3486 // elements for floating point vectors. 3487 if (lType->isIntegerType()) 3488 return lType; 3489 3490 const VectorType *VTy = lType->getAsVectorType(); 3491 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3492 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3493 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3494 else if (TypeSize == Context.getTypeSize(Context.LongTy)) 3495 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3496 3497 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3498 "Unhandled vector element size in vector compare"); 3499 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3500} 3501 3502inline QualType Sema::CheckBitwiseOperands( 3503 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3504{ 3505 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3506 return CheckVectorOperands(Loc, lex, rex); 3507 3508 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3509 3510 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3511 return compType; 3512 return InvalidOperands(Loc, lex, rex); 3513} 3514 3515inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3516 Expr *&lex, Expr *&rex, SourceLocation Loc) 3517{ 3518 UsualUnaryConversions(lex); 3519 UsualUnaryConversions(rex); 3520 3521 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3522 return Context.IntTy; 3523 return InvalidOperands(Loc, lex, rex); 3524} 3525 3526/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3527/// is a read-only property; return true if so. A readonly property expression 3528/// depends on various declarations and thus must be treated specially. 3529/// 3530static bool IsReadonlyProperty(Expr *E, Sema &S) 3531{ 3532 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3533 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3534 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3535 QualType BaseType = PropExpr->getBase()->getType(); 3536 if (const PointerType *PTy = BaseType->getAsPointerType()) 3537 if (const ObjCInterfaceType *IFTy = 3538 PTy->getPointeeType()->getAsObjCInterfaceType()) 3539 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3540 if (S.isPropertyReadonly(PDecl, IFace)) 3541 return true; 3542 } 3543 } 3544 return false; 3545} 3546 3547/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3548/// emit an error and return true. If so, return false. 3549static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3550 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 3551 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3552 IsLV = Expr::MLV_ReadonlyProperty; 3553 if (IsLV == Expr::MLV_Valid) 3554 return false; 3555 3556 unsigned Diag = 0; 3557 bool NeedType = false; 3558 switch (IsLV) { // C99 6.5.16p2 3559 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3560 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3561 case Expr::MLV_ArrayType: 3562 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3563 NeedType = true; 3564 break; 3565 case Expr::MLV_NotObjectType: 3566 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3567 NeedType = true; 3568 break; 3569 case Expr::MLV_LValueCast: 3570 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3571 break; 3572 case Expr::MLV_InvalidExpression: 3573 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3574 break; 3575 case Expr::MLV_IncompleteType: 3576 case Expr::MLV_IncompleteVoidType: 3577 return S.RequireCompleteType(Loc, E->getType(), 3578 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3579 E->getSourceRange()); 3580 case Expr::MLV_DuplicateVectorComponents: 3581 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 3582 break; 3583 case Expr::MLV_NotBlockQualified: 3584 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 3585 break; 3586 case Expr::MLV_ReadonlyProperty: 3587 Diag = diag::error_readonly_property_assignment; 3588 break; 3589 case Expr::MLV_NoSetterProperty: 3590 Diag = diag::error_nosetter_property_assignment; 3591 break; 3592 } 3593 3594 if (NeedType) 3595 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 3596 else 3597 S.Diag(Loc, Diag) << E->getSourceRange(); 3598 return true; 3599} 3600 3601 3602 3603// C99 6.5.16.1 3604QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 3605 SourceLocation Loc, 3606 QualType CompoundType) { 3607 // Verify that LHS is a modifiable lvalue, and emit error if not. 3608 if (CheckForModifiableLvalue(LHS, Loc, *this)) 3609 return QualType(); 3610 3611 QualType LHSType = LHS->getType(); 3612 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 3613 3614 AssignConvertType ConvTy; 3615 if (CompoundType.isNull()) { 3616 // Simple assignment "x = y". 3617 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 3618 // Special case of NSObject attributes on c-style pointer types. 3619 if (ConvTy == IncompatiblePointer && 3620 ((Context.isObjCNSObjectType(LHSType) && 3621 Context.isObjCObjectPointerType(RHSType)) || 3622 (Context.isObjCNSObjectType(RHSType) && 3623 Context.isObjCObjectPointerType(LHSType)))) 3624 ConvTy = Compatible; 3625 3626 // If the RHS is a unary plus or minus, check to see if they = and + are 3627 // right next to each other. If so, the user may have typo'd "x =+ 4" 3628 // instead of "x += 4". 3629 Expr *RHSCheck = RHS; 3630 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 3631 RHSCheck = ICE->getSubExpr(); 3632 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 3633 if ((UO->getOpcode() == UnaryOperator::Plus || 3634 UO->getOpcode() == UnaryOperator::Minus) && 3635 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 3636 // Only if the two operators are exactly adjacent. 3637 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 3638 // And there is a space or other character before the subexpr of the 3639 // unary +/-. We don't want to warn on "x=-1". 3640 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 3641 UO->getSubExpr()->getLocStart().isFileID()) { 3642 Diag(Loc, diag::warn_not_compound_assign) 3643 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 3644 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 3645 } 3646 } 3647 } else { 3648 // Compound assignment "x += y" 3649 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 3650 } 3651 3652 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 3653 RHS, "assigning")) 3654 return QualType(); 3655 3656 // C99 6.5.16p3: The type of an assignment expression is the type of the 3657 // left operand unless the left operand has qualified type, in which case 3658 // it is the unqualified version of the type of the left operand. 3659 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 3660 // is converted to the type of the assignment expression (above). 3661 // C++ 5.17p1: the type of the assignment expression is that of its left 3662 // oprdu. 3663 return LHSType.getUnqualifiedType(); 3664} 3665 3666// C99 6.5.17 3667QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 3668 // FIXME: what is required for LHS? 3669 3670 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 3671 DefaultFunctionArrayConversion(RHS); 3672 return RHS->getType(); 3673} 3674 3675/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 3676/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 3677QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 3678 bool isInc) { 3679 if (Op->isTypeDependent()) 3680 return Context.DependentTy; 3681 3682 QualType ResType = Op->getType(); 3683 assert(!ResType.isNull() && "no type for increment/decrement expression"); 3684 3685 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 3686 // Decrement of bool is not allowed. 3687 if (!isInc) { 3688 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 3689 return QualType(); 3690 } 3691 // Increment of bool sets it to true, but is deprecated. 3692 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 3693 } else if (ResType->isRealType()) { 3694 // OK! 3695 } else if (const PointerType *PT = ResType->getAsPointerType()) { 3696 // C99 6.5.2.4p2, 6.5.6p2 3697 if (PT->getPointeeType()->isObjectType()) { 3698 // Pointer to object is ok! 3699 } else if (PT->getPointeeType()->isVoidType()) { 3700 if (getLangOptions().CPlusPlus) { 3701 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 3702 << Op->getSourceRange(); 3703 return QualType(); 3704 } 3705 3706 // Pointer to void is a GNU extension in C. 3707 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 3708 } else if (PT->getPointeeType()->isFunctionType()) { 3709 if (getLangOptions().CPlusPlus) { 3710 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 3711 << Op->getType() << Op->getSourceRange(); 3712 return QualType(); 3713 } 3714 3715 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 3716 << ResType << Op->getSourceRange(); 3717 } else { 3718 RequireCompleteType(OpLoc, PT->getPointeeType(), 3719 diag::err_typecheck_arithmetic_incomplete_type, 3720 Op->getSourceRange(), SourceRange(), 3721 ResType); 3722 return QualType(); 3723 } 3724 } else if (ResType->isComplexType()) { 3725 // C99 does not support ++/-- on complex types, we allow as an extension. 3726 Diag(OpLoc, diag::ext_integer_increment_complex) 3727 << ResType << Op->getSourceRange(); 3728 } else { 3729 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 3730 << ResType << Op->getSourceRange(); 3731 return QualType(); 3732 } 3733 // At this point, we know we have a real, complex or pointer type. 3734 // Now make sure the operand is a modifiable lvalue. 3735 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 3736 return QualType(); 3737 return ResType; 3738} 3739 3740/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 3741/// This routine allows us to typecheck complex/recursive expressions 3742/// where the declaration is needed for type checking. We only need to 3743/// handle cases when the expression references a function designator 3744/// or is an lvalue. Here are some examples: 3745/// - &(x) => x 3746/// - &*****f => f for f a function designator. 3747/// - &s.xx => s 3748/// - &s.zz[1].yy -> s, if zz is an array 3749/// - *(x + 1) -> x, if x is an array 3750/// - &"123"[2] -> 0 3751/// - & __real__ x -> x 3752static NamedDecl *getPrimaryDecl(Expr *E) { 3753 switch (E->getStmtClass()) { 3754 case Stmt::DeclRefExprClass: 3755 case Stmt::QualifiedDeclRefExprClass: 3756 return cast<DeclRefExpr>(E)->getDecl(); 3757 case Stmt::MemberExprClass: 3758 // Fields cannot be declared with a 'register' storage class. 3759 // &X->f is always ok, even if X is declared register. 3760 if (cast<MemberExpr>(E)->isArrow()) 3761 return 0; 3762 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 3763 case Stmt::ArraySubscriptExprClass: { 3764 // &X[4] and &4[X] refers to X if X is not a pointer. 3765 3766 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 3767 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 3768 if (!VD || VD->getType()->isPointerType()) 3769 return 0; 3770 else 3771 return VD; 3772 } 3773 case Stmt::UnaryOperatorClass: { 3774 UnaryOperator *UO = cast<UnaryOperator>(E); 3775 3776 switch(UO->getOpcode()) { 3777 case UnaryOperator::Deref: { 3778 // *(X + 1) refers to X if X is not a pointer. 3779 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 3780 ValueDecl *VD = dyn_cast<ValueDecl>(D); 3781 if (!VD || VD->getType()->isPointerType()) 3782 return 0; 3783 return VD; 3784 } 3785 return 0; 3786 } 3787 case UnaryOperator::Real: 3788 case UnaryOperator::Imag: 3789 case UnaryOperator::Extension: 3790 return getPrimaryDecl(UO->getSubExpr()); 3791 default: 3792 return 0; 3793 } 3794 } 3795 case Stmt::BinaryOperatorClass: { 3796 BinaryOperator *BO = cast<BinaryOperator>(E); 3797 3798 // Handle cases involving pointer arithmetic. The result of an 3799 // Assign or AddAssign is not an lvalue so they can be ignored. 3800 3801 // (x + n) or (n + x) => x 3802 if (BO->getOpcode() == BinaryOperator::Add) { 3803 if (BO->getLHS()->getType()->isPointerType()) { 3804 return getPrimaryDecl(BO->getLHS()); 3805 } else if (BO->getRHS()->getType()->isPointerType()) { 3806 return getPrimaryDecl(BO->getRHS()); 3807 } 3808 } 3809 3810 return 0; 3811 } 3812 case Stmt::ParenExprClass: 3813 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 3814 case Stmt::ImplicitCastExprClass: 3815 // &X[4] when X is an array, has an implicit cast from array to pointer. 3816 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 3817 default: 3818 return 0; 3819 } 3820} 3821 3822/// CheckAddressOfOperand - The operand of & must be either a function 3823/// designator or an lvalue designating an object. If it is an lvalue, the 3824/// object cannot be declared with storage class register or be a bit field. 3825/// Note: The usual conversions are *not* applied to the operand of the & 3826/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 3827/// In C++, the operand might be an overloaded function name, in which case 3828/// we allow the '&' but retain the overloaded-function type. 3829QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 3830 if (op->isTypeDependent()) 3831 return Context.DependentTy; 3832 3833 if (getLangOptions().C99) { 3834 // Implement C99-only parts of addressof rules. 3835 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 3836 if (uOp->getOpcode() == UnaryOperator::Deref) 3837 // Per C99 6.5.3.2, the address of a deref always returns a valid result 3838 // (assuming the deref expression is valid). 3839 return uOp->getSubExpr()->getType(); 3840 } 3841 // Technically, there should be a check for array subscript 3842 // expressions here, but the result of one is always an lvalue anyway. 3843 } 3844 NamedDecl *dcl = getPrimaryDecl(op); 3845 Expr::isLvalueResult lval = op->isLvalue(Context); 3846 3847 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 3848 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 3849 // FIXME: emit more specific diag... 3850 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 3851 << op->getSourceRange(); 3852 return QualType(); 3853 } 3854 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 3855 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemExpr->getMemberDecl())) { 3856 if (Field->isBitField()) { 3857 Diag(OpLoc, diag::err_typecheck_address_of) 3858 << "bit-field" << op->getSourceRange(); 3859 return QualType(); 3860 } 3861 } 3862 // Check for Apple extension for accessing vector components. 3863 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 3864 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 3865 Diag(OpLoc, diag::err_typecheck_address_of) 3866 << "vector element" << op->getSourceRange(); 3867 return QualType(); 3868 } else if (dcl) { // C99 6.5.3.2p1 3869 // We have an lvalue with a decl. Make sure the decl is not declared 3870 // with the register storage-class specifier. 3871 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 3872 if (vd->getStorageClass() == VarDecl::Register) { 3873 Diag(OpLoc, diag::err_typecheck_address_of) 3874 << "register variable" << op->getSourceRange(); 3875 return QualType(); 3876 } 3877 } else if (isa<OverloadedFunctionDecl>(dcl)) { 3878 return Context.OverloadTy; 3879 } else if (isa<FieldDecl>(dcl)) { 3880 // Okay: we can take the address of a field. 3881 // Could be a pointer to member, though, if there is an explicit 3882 // scope qualifier for the class. 3883 if (isa<QualifiedDeclRefExpr>(op)) { 3884 DeclContext *Ctx = dcl->getDeclContext(); 3885 if (Ctx && Ctx->isRecord()) 3886 return Context.getMemberPointerType(op->getType(), 3887 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3888 } 3889 } else if (isa<FunctionDecl>(dcl)) { 3890 // Okay: we can take the address of a function. 3891 // As above. 3892 if (isa<QualifiedDeclRefExpr>(op)) { 3893 DeclContext *Ctx = dcl->getDeclContext(); 3894 if (Ctx && Ctx->isRecord()) 3895 return Context.getMemberPointerType(op->getType(), 3896 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3897 } 3898 } 3899 else 3900 assert(0 && "Unknown/unexpected decl type"); 3901 } 3902 3903 // If the operand has type "type", the result has type "pointer to type". 3904 return Context.getPointerType(op->getType()); 3905} 3906 3907QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 3908 if (Op->isTypeDependent()) 3909 return Context.DependentTy; 3910 3911 UsualUnaryConversions(Op); 3912 QualType Ty = Op->getType(); 3913 3914 // Note that per both C89 and C99, this is always legal, even if ptype is an 3915 // incomplete type or void. It would be possible to warn about dereferencing 3916 // a void pointer, but it's completely well-defined, and such a warning is 3917 // unlikely to catch any mistakes. 3918 if (const PointerType *PT = Ty->getAsPointerType()) 3919 return PT->getPointeeType(); 3920 3921 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 3922 << Ty << Op->getSourceRange(); 3923 return QualType(); 3924} 3925 3926static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 3927 tok::TokenKind Kind) { 3928 BinaryOperator::Opcode Opc; 3929 switch (Kind) { 3930 default: assert(0 && "Unknown binop!"); 3931 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 3932 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 3933 case tok::star: Opc = BinaryOperator::Mul; break; 3934 case tok::slash: Opc = BinaryOperator::Div; break; 3935 case tok::percent: Opc = BinaryOperator::Rem; break; 3936 case tok::plus: Opc = BinaryOperator::Add; break; 3937 case tok::minus: Opc = BinaryOperator::Sub; break; 3938 case tok::lessless: Opc = BinaryOperator::Shl; break; 3939 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 3940 case tok::lessequal: Opc = BinaryOperator::LE; break; 3941 case tok::less: Opc = BinaryOperator::LT; break; 3942 case tok::greaterequal: Opc = BinaryOperator::GE; break; 3943 case tok::greater: Opc = BinaryOperator::GT; break; 3944 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 3945 case tok::equalequal: Opc = BinaryOperator::EQ; break; 3946 case tok::amp: Opc = BinaryOperator::And; break; 3947 case tok::caret: Opc = BinaryOperator::Xor; break; 3948 case tok::pipe: Opc = BinaryOperator::Or; break; 3949 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 3950 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 3951 case tok::equal: Opc = BinaryOperator::Assign; break; 3952 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 3953 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 3954 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 3955 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 3956 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 3957 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 3958 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 3959 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 3960 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 3961 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 3962 case tok::comma: Opc = BinaryOperator::Comma; break; 3963 } 3964 return Opc; 3965} 3966 3967static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 3968 tok::TokenKind Kind) { 3969 UnaryOperator::Opcode Opc; 3970 switch (Kind) { 3971 default: assert(0 && "Unknown unary op!"); 3972 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 3973 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 3974 case tok::amp: Opc = UnaryOperator::AddrOf; break; 3975 case tok::star: Opc = UnaryOperator::Deref; break; 3976 case tok::plus: Opc = UnaryOperator::Plus; break; 3977 case tok::minus: Opc = UnaryOperator::Minus; break; 3978 case tok::tilde: Opc = UnaryOperator::Not; break; 3979 case tok::exclaim: Opc = UnaryOperator::LNot; break; 3980 case tok::kw___real: Opc = UnaryOperator::Real; break; 3981 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 3982 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 3983 } 3984 return Opc; 3985} 3986 3987/// CreateBuiltinBinOp - Creates a new built-in binary operation with 3988/// operator @p Opc at location @c TokLoc. This routine only supports 3989/// built-in operations; ActOnBinOp handles overloaded operators. 3990Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 3991 unsigned Op, 3992 Expr *lhs, Expr *rhs) { 3993 QualType ResultTy; // Result type of the binary operator. 3994 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 3995 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 3996 3997 switch (Opc) { 3998 case BinaryOperator::Assign: 3999 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4000 break; 4001 case BinaryOperator::PtrMemD: 4002 case BinaryOperator::PtrMemI: 4003 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4004 Opc == BinaryOperator::PtrMemI); 4005 break; 4006 case BinaryOperator::Mul: 4007 case BinaryOperator::Div: 4008 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4009 break; 4010 case BinaryOperator::Rem: 4011 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4012 break; 4013 case BinaryOperator::Add: 4014 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4015 break; 4016 case BinaryOperator::Sub: 4017 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4018 break; 4019 case BinaryOperator::Shl: 4020 case BinaryOperator::Shr: 4021 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4022 break; 4023 case BinaryOperator::LE: 4024 case BinaryOperator::LT: 4025 case BinaryOperator::GE: 4026 case BinaryOperator::GT: 4027 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 4028 break; 4029 case BinaryOperator::EQ: 4030 case BinaryOperator::NE: 4031 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 4032 break; 4033 case BinaryOperator::And: 4034 case BinaryOperator::Xor: 4035 case BinaryOperator::Or: 4036 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4037 break; 4038 case BinaryOperator::LAnd: 4039 case BinaryOperator::LOr: 4040 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4041 break; 4042 case BinaryOperator::MulAssign: 4043 case BinaryOperator::DivAssign: 4044 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4045 if (!CompTy.isNull()) 4046 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4047 break; 4048 case BinaryOperator::RemAssign: 4049 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4050 if (!CompTy.isNull()) 4051 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4052 break; 4053 case BinaryOperator::AddAssign: 4054 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 4055 if (!CompTy.isNull()) 4056 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4057 break; 4058 case BinaryOperator::SubAssign: 4059 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 4060 if (!CompTy.isNull()) 4061 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4062 break; 4063 case BinaryOperator::ShlAssign: 4064 case BinaryOperator::ShrAssign: 4065 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4066 if (!CompTy.isNull()) 4067 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4068 break; 4069 case BinaryOperator::AndAssign: 4070 case BinaryOperator::XorAssign: 4071 case BinaryOperator::OrAssign: 4072 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4073 if (!CompTy.isNull()) 4074 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4075 break; 4076 case BinaryOperator::Comma: 4077 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4078 break; 4079 } 4080 if (ResultTy.isNull()) 4081 return ExprError(); 4082 if (CompTy.isNull()) 4083 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4084 else 4085 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4086 CompTy, OpLoc)); 4087} 4088 4089// Binary Operators. 'Tok' is the token for the operator. 4090Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4091 tok::TokenKind Kind, 4092 ExprArg LHS, ExprArg RHS) { 4093 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4094 Expr *lhs = (Expr *)LHS.release(), *rhs = (Expr*)RHS.release(); 4095 4096 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4097 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4098 4099 if (getLangOptions().CPlusPlus && 4100 (lhs->getType()->isOverloadableType() || 4101 rhs->getType()->isOverloadableType())) { 4102 // Find all of the overloaded operators visible from this 4103 // point. We perform both an operator-name lookup from the local 4104 // scope and an argument-dependent lookup based on the types of 4105 // the arguments. 4106 FunctionSet Functions; 4107 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4108 if (OverOp != OO_None) { 4109 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4110 Functions); 4111 Expr *Args[2] = { lhs, rhs }; 4112 DeclarationName OpName 4113 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4114 ArgumentDependentLookup(OpName, Args, 2, Functions); 4115 } 4116 4117 // Build the (potentially-overloaded, potentially-dependent) 4118 // binary operation. 4119 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4120 } 4121 4122 // Build a built-in binary operation. 4123 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4124} 4125 4126Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4127 unsigned OpcIn, 4128 ExprArg InputArg) { 4129 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4130 4131 // FIXME: Input is modified below, but InputArg is not updated 4132 // appropriately. 4133 Expr *Input = (Expr *)InputArg.get(); 4134 QualType resultType; 4135 switch (Opc) { 4136 case UnaryOperator::PostInc: 4137 case UnaryOperator::PostDec: 4138 case UnaryOperator::OffsetOf: 4139 assert(false && "Invalid unary operator"); 4140 break; 4141 4142 case UnaryOperator::PreInc: 4143 case UnaryOperator::PreDec: 4144 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4145 Opc == UnaryOperator::PreInc); 4146 break; 4147 case UnaryOperator::AddrOf: 4148 resultType = CheckAddressOfOperand(Input, OpLoc); 4149 break; 4150 case UnaryOperator::Deref: 4151 DefaultFunctionArrayConversion(Input); 4152 resultType = CheckIndirectionOperand(Input, OpLoc); 4153 break; 4154 case UnaryOperator::Plus: 4155 case UnaryOperator::Minus: 4156 UsualUnaryConversions(Input); 4157 resultType = Input->getType(); 4158 if (resultType->isDependentType()) 4159 break; 4160 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4161 break; 4162 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4163 resultType->isEnumeralType()) 4164 break; 4165 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4166 Opc == UnaryOperator::Plus && 4167 resultType->isPointerType()) 4168 break; 4169 4170 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4171 << resultType << Input->getSourceRange()); 4172 case UnaryOperator::Not: // bitwise complement 4173 UsualUnaryConversions(Input); 4174 resultType = Input->getType(); 4175 if (resultType->isDependentType()) 4176 break; 4177 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4178 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4179 // C99 does not support '~' for complex conjugation. 4180 Diag(OpLoc, diag::ext_integer_complement_complex) 4181 << resultType << Input->getSourceRange(); 4182 else if (!resultType->isIntegerType()) 4183 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4184 << resultType << Input->getSourceRange()); 4185 break; 4186 case UnaryOperator::LNot: // logical negation 4187 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4188 DefaultFunctionArrayConversion(Input); 4189 resultType = Input->getType(); 4190 if (resultType->isDependentType()) 4191 break; 4192 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4193 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4194 << resultType << Input->getSourceRange()); 4195 // LNot always has type int. C99 6.5.3.3p5. 4196 // In C++, it's bool. C++ 5.3.1p8 4197 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4198 break; 4199 case UnaryOperator::Real: 4200 case UnaryOperator::Imag: 4201 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4202 break; 4203 case UnaryOperator::Extension: 4204 resultType = Input->getType(); 4205 break; 4206 } 4207 if (resultType.isNull()) 4208 return ExprError(); 4209 4210 InputArg.release(); 4211 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4212} 4213 4214// Unary Operators. 'Tok' is the token for the operator. 4215Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4216 tok::TokenKind Op, ExprArg input) { 4217 Expr *Input = (Expr*)input.get(); 4218 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4219 4220 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4221 // Find all of the overloaded operators visible from this 4222 // point. We perform both an operator-name lookup from the local 4223 // scope and an argument-dependent lookup based on the types of 4224 // the arguments. 4225 FunctionSet Functions; 4226 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4227 if (OverOp != OO_None) { 4228 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4229 Functions); 4230 DeclarationName OpName 4231 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4232 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4233 } 4234 4235 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4236 } 4237 4238 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4239} 4240 4241/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4242Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4243 SourceLocation LabLoc, 4244 IdentifierInfo *LabelII) { 4245 // Look up the record for this label identifier. 4246 LabelStmt *&LabelDecl = CurBlock ? CurBlock->LabelMap[LabelII] : 4247 LabelMap[LabelII]; 4248 4249 // If we haven't seen this label yet, create a forward reference. It 4250 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4251 if (LabelDecl == 0) 4252 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4253 4254 // Create the AST node. The address of a label always has type 'void*'. 4255 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4256 Context.getPointerType(Context.VoidTy))); 4257} 4258 4259Sema::OwningExprResult 4260Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4261 SourceLocation RPLoc) { // "({..})" 4262 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4263 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4264 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4265 4266 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4267 if (isFileScope) { 4268 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4269 } 4270 4271 // FIXME: there are a variety of strange constraints to enforce here, for 4272 // example, it is not possible to goto into a stmt expression apparently. 4273 // More semantic analysis is needed. 4274 4275 // FIXME: the last statement in the compount stmt has its value used. We 4276 // should not warn about it being unused. 4277 4278 // If there are sub stmts in the compound stmt, take the type of the last one 4279 // as the type of the stmtexpr. 4280 QualType Ty = Context.VoidTy; 4281 4282 if (!Compound->body_empty()) { 4283 Stmt *LastStmt = Compound->body_back(); 4284 // If LastStmt is a label, skip down through into the body. 4285 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4286 LastStmt = Label->getSubStmt(); 4287 4288 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4289 Ty = LastExpr->getType(); 4290 } 4291 4292 substmt.release(); 4293 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4294} 4295 4296Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4297 SourceLocation BuiltinLoc, 4298 SourceLocation TypeLoc, 4299 TypeTy *argty, 4300 OffsetOfComponent *CompPtr, 4301 unsigned NumComponents, 4302 SourceLocation RPLoc) { 4303 // FIXME: This function leaks all expressions in the offset components on 4304 // error. 4305 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4306 assert(!ArgTy.isNull() && "Missing type argument!"); 4307 4308 bool Dependent = ArgTy->isDependentType(); 4309 4310 // We must have at least one component that refers to the type, and the first 4311 // one is known to be a field designator. Verify that the ArgTy represents 4312 // a struct/union/class. 4313 if (!Dependent && !ArgTy->isRecordType()) 4314 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4315 4316 // FIXME: Does the type need to be complete? 4317 4318 // Otherwise, create a null pointer as the base, and iteratively process 4319 // the offsetof designators. 4320 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4321 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4322 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4323 ArgTy, SourceLocation()); 4324 4325 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4326 // GCC extension, diagnose them. 4327 // FIXME: This diagnostic isn't actually visible because the location is in 4328 // a system header! 4329 if (NumComponents != 1) 4330 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4331 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4332 4333 if (!Dependent) { 4334 // FIXME: Dependent case loses a lot of information here. And probably 4335 // leaks like a sieve. 4336 for (unsigned i = 0; i != NumComponents; ++i) { 4337 const OffsetOfComponent &OC = CompPtr[i]; 4338 if (OC.isBrackets) { 4339 // Offset of an array sub-field. TODO: Should we allow vector elements? 4340 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4341 if (!AT) { 4342 Res->Destroy(Context); 4343 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 4344 << Res->getType()); 4345 } 4346 4347 // FIXME: C++: Verify that operator[] isn't overloaded. 4348 4349 // Promote the array so it looks more like a normal array subscript 4350 // expression. 4351 DefaultFunctionArrayConversion(Res); 4352 4353 // C99 6.5.2.1p1 4354 Expr *Idx = static_cast<Expr*>(OC.U.E); 4355 // FIXME: Leaks Res 4356 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4357 return ExprError(Diag(Idx->getLocStart(), 4358 diag::err_typecheck_subscript) 4359 << Idx->getSourceRange()); 4360 4361 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4362 OC.LocEnd); 4363 continue; 4364 } 4365 4366 const RecordType *RC = Res->getType()->getAsRecordType(); 4367 if (!RC) { 4368 Res->Destroy(Context); 4369 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 4370 << Res->getType()); 4371 } 4372 4373 // Get the decl corresponding to this. 4374 RecordDecl *RD = RC->getDecl(); 4375 FieldDecl *MemberDecl 4376 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4377 LookupMemberName) 4378 .getAsDecl()); 4379 // FIXME: Leaks Res 4380 if (!MemberDecl) 4381 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 4382 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 4383 4384 // FIXME: C++: Verify that MemberDecl isn't a static field. 4385 // FIXME: Verify that MemberDecl isn't a bitfield. 4386 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 4387 // matter here. 4388 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4389 MemberDecl->getType().getNonReferenceType()); 4390 } 4391 } 4392 4393 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4394 Context.getSizeType(), BuiltinLoc)); 4395} 4396 4397 4398Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4399 TypeTy *arg1,TypeTy *arg2, 4400 SourceLocation RPLoc) { 4401 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4402 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4403 4404 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4405 4406 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 4407 argT1, argT2, RPLoc)); 4408} 4409 4410Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 4411 ExprArg cond, 4412 ExprArg expr1, ExprArg expr2, 4413 SourceLocation RPLoc) { 4414 Expr *CondExpr = static_cast<Expr*>(cond.get()); 4415 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 4416 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 4417 4418 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4419 4420 QualType resType; 4421 if (CondExpr->isValueDependent()) { 4422 resType = Context.DependentTy; 4423 } else { 4424 // The conditional expression is required to be a constant expression. 4425 llvm::APSInt condEval(32); 4426 SourceLocation ExpLoc; 4427 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4428 return ExprError(Diag(ExpLoc, 4429 diag::err_typecheck_choose_expr_requires_constant) 4430 << CondExpr->getSourceRange()); 4431 4432 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4433 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 4434 } 4435 4436 cond.release(); expr1.release(); expr2.release(); 4437 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4438 resType, RPLoc)); 4439} 4440 4441//===----------------------------------------------------------------------===// 4442// Clang Extensions. 4443//===----------------------------------------------------------------------===// 4444 4445/// ActOnBlockStart - This callback is invoked when a block literal is started. 4446void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4447 // Analyze block parameters. 4448 BlockSemaInfo *BSI = new BlockSemaInfo(); 4449 4450 // Add BSI to CurBlock. 4451 BSI->PrevBlockInfo = CurBlock; 4452 CurBlock = BSI; 4453 4454 BSI->ReturnType = 0; 4455 BSI->TheScope = BlockScope; 4456 BSI->hasBlockDeclRefExprs = false; 4457 4458 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4459 PushDeclContext(BlockScope, BSI->TheDecl); 4460} 4461 4462void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4463 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4464 4465 if (ParamInfo.getNumTypeObjects() == 0 4466 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4467 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4468 4469 // The type is entirely optional as well, if none, use DependentTy. 4470 if (T.isNull()) 4471 T = Context.DependentTy; 4472 4473 // The parameter list is optional, if there was none, assume (). 4474 if (!T->isFunctionType()) 4475 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4476 4477 CurBlock->hasPrototype = true; 4478 CurBlock->isVariadic = false; 4479 Type *RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4480 .getTypePtr(); 4481 4482 if (!RetTy->isDependentType()) 4483 CurBlock->ReturnType = RetTy; 4484 return; 4485 } 4486 4487 // Analyze arguments to block. 4488 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4489 "Not a function declarator!"); 4490 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4491 4492 CurBlock->hasPrototype = FTI.hasPrototype; 4493 CurBlock->isVariadic = true; 4494 4495 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4496 // no arguments, not a function that takes a single void argument. 4497 if (FTI.hasPrototype && 4498 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4499 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 4500 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 4501 // empty arg list, don't push any params. 4502 CurBlock->isVariadic = false; 4503 } else if (FTI.hasPrototype) { 4504 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4505 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 4506 CurBlock->isVariadic = FTI.isVariadic; 4507 QualType T = GetTypeForDeclarator (ParamInfo, CurScope); 4508 4509 Type* RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4510 .getTypePtr(); 4511 4512 if (!RetTy->isDependentType()) 4513 CurBlock->ReturnType = RetTy; 4514 } 4515 CurBlock->TheDecl->setParams(Context, &CurBlock->Params[0], 4516 CurBlock->Params.size()); 4517 4518 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4519 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4520 // If this has an identifier, add it to the scope stack. 4521 if ((*AI)->getIdentifier()) 4522 PushOnScopeChains(*AI, CurBlock->TheScope); 4523} 4524 4525/// ActOnBlockError - If there is an error parsing a block, this callback 4526/// is invoked to pop the information about the block from the action impl. 4527void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4528 // Ensure that CurBlock is deleted. 4529 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4530 4531 // Pop off CurBlock, handle nested blocks. 4532 CurBlock = CurBlock->PrevBlockInfo; 4533 4534 // FIXME: Delete the ParmVarDecl objects as well??? 4535 4536} 4537 4538/// ActOnBlockStmtExpr - This is called when the body of a block statement 4539/// literal was successfully completed. ^(int x){...} 4540Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 4541 StmtArg body, Scope *CurScope) { 4542 // Ensure that CurBlock is deleted. 4543 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4544 4545 PopDeclContext(); 4546 4547 // Pop off CurBlock, handle nested blocks. 4548 CurBlock = CurBlock->PrevBlockInfo; 4549 4550 QualType RetTy = Context.VoidTy; 4551 if (BSI->ReturnType) 4552 RetTy = QualType(BSI->ReturnType, 0); 4553 4554 llvm::SmallVector<QualType, 8> ArgTypes; 4555 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4556 ArgTypes.push_back(BSI->Params[i]->getType()); 4557 4558 QualType BlockTy; 4559 if (!BSI->hasPrototype) 4560 BlockTy = Context.getFunctionNoProtoType(RetTy); 4561 else 4562 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 4563 BSI->isVariadic, 0); 4564 4565 BlockTy = Context.getBlockPointerType(BlockTy); 4566 4567 BSI->TheDecl->setBody(static_cast<CompoundStmt*>(body.release())); 4568 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 4569 BSI->hasBlockDeclRefExprs)); 4570} 4571 4572Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 4573 ExprArg expr, TypeTy *type, 4574 SourceLocation RPLoc) { 4575 QualType T = QualType::getFromOpaquePtr(type); 4576 4577 InitBuiltinVaListType(); 4578 4579 // Get the va_list type 4580 QualType VaListType = Context.getBuiltinVaListType(); 4581 // Deal with implicit array decay; for example, on x86-64, 4582 // va_list is an array, but it's supposed to decay to 4583 // a pointer for va_arg. 4584 if (VaListType->isArrayType()) 4585 VaListType = Context.getArrayDecayedType(VaListType); 4586 // Make sure the input expression also decays appropriately. 4587 Expr *E = static_cast<Expr*>(expr.get()); 4588 UsualUnaryConversions(E); 4589 4590 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 4591 return ExprError(Diag(E->getLocStart(), 4592 diag::err_first_argument_to_va_arg_not_of_type_va_list) 4593 << E->getType() << E->getSourceRange()); 4594 4595 // FIXME: Warn if a non-POD type is passed in. 4596 4597 expr.release(); 4598 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 4599 RPLoc)); 4600} 4601 4602Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 4603 // The type of __null will be int or long, depending on the size of 4604 // pointers on the target. 4605 QualType Ty; 4606 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 4607 Ty = Context.IntTy; 4608 else 4609 Ty = Context.LongTy; 4610 4611 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 4612} 4613 4614bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 4615 SourceLocation Loc, 4616 QualType DstType, QualType SrcType, 4617 Expr *SrcExpr, const char *Flavor) { 4618 // Decode the result (notice that AST's are still created for extensions). 4619 bool isInvalid = false; 4620 unsigned DiagKind; 4621 switch (ConvTy) { 4622 default: assert(0 && "Unknown conversion type"); 4623 case Compatible: return false; 4624 case PointerToInt: 4625 DiagKind = diag::ext_typecheck_convert_pointer_int; 4626 break; 4627 case IntToPointer: 4628 DiagKind = diag::ext_typecheck_convert_int_pointer; 4629 break; 4630 case IncompatiblePointer: 4631 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 4632 break; 4633 case FunctionVoidPointer: 4634 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 4635 break; 4636 case CompatiblePointerDiscardsQualifiers: 4637 // If the qualifiers lost were because we were applying the 4638 // (deprecated) C++ conversion from a string literal to a char* 4639 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 4640 // Ideally, this check would be performed in 4641 // CheckPointerTypesForAssignment. However, that would require a 4642 // bit of refactoring (so that the second argument is an 4643 // expression, rather than a type), which should be done as part 4644 // of a larger effort to fix CheckPointerTypesForAssignment for 4645 // C++ semantics. 4646 if (getLangOptions().CPlusPlus && 4647 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 4648 return false; 4649 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 4650 break; 4651 case IntToBlockPointer: 4652 DiagKind = diag::err_int_to_block_pointer; 4653 break; 4654 case IncompatibleBlockPointer: 4655 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 4656 break; 4657 case IncompatibleObjCQualifiedId: 4658 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 4659 // it can give a more specific diagnostic. 4660 DiagKind = diag::warn_incompatible_qualified_id; 4661 break; 4662 case IncompatibleVectors: 4663 DiagKind = diag::warn_incompatible_vectors; 4664 break; 4665 case Incompatible: 4666 DiagKind = diag::err_typecheck_convert_incompatible; 4667 isInvalid = true; 4668 break; 4669 } 4670 4671 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 4672 << SrcExpr->getSourceRange(); 4673 return isInvalid; 4674} 4675 4676bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 4677{ 4678 Expr::EvalResult EvalResult; 4679 4680 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 4681 EvalResult.HasSideEffects) { 4682 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 4683 4684 if (EvalResult.Diag) { 4685 // We only show the note if it's not the usual "invalid subexpression" 4686 // or if it's actually in a subexpression. 4687 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 4688 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 4689 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4690 } 4691 4692 return true; 4693 } 4694 4695 if (EvalResult.Diag) { 4696 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 4697 E->getSourceRange(); 4698 4699 // Print the reason it's not a constant. 4700 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4701 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4702 } 4703 4704 if (Result) 4705 *Result = EvalResult.Val.getInt(); 4706 return false; 4707} 4708