SemaExpr.cpp revision 2b12832863fe3c79694ac143f5b5abe8d52364b9
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 QualType ExprTy = VD->getType().getNonReferenceType(); 936 // The BlocksAttr indicates the variable is bound by-reference. 937 if (VD->getAttr<BlocksAttr>()) 938 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 939 940 // Variable will be bound by-copy, make it const within the closure. 941 ExprTy.addConst(); 942 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false)); 943 } 944 // If this reference is not in a block or if the referenced variable is 945 // within the block, create a normal DeclRefExpr. 946 947 bool TypeDependent = false; 948 bool ValueDependent = false; 949 if (getLangOptions().CPlusPlus) { 950 // C++ [temp.dep.expr]p3: 951 // An id-expression is type-dependent if it contains: 952 // - an identifier that was declared with a dependent type, 953 if (VD->getType()->isDependentType()) 954 TypeDependent = true; 955 // - FIXME: a template-id that is dependent, 956 // - a conversion-function-id that specifies a dependent type, 957 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 958 Name.getCXXNameType()->isDependentType()) 959 TypeDependent = true; 960 // - a nested-name-specifier that contains a class-name that 961 // names a dependent type. 962 else if (SS && !SS->isEmpty()) { 963 for (DeclContext *DC = computeDeclContext(*SS); 964 DC; DC = DC->getParent()) { 965 // FIXME: could stop early at namespace scope. 966 if (DC->isRecord()) { 967 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 968 if (Context.getTypeDeclType(Record)->isDependentType()) { 969 TypeDependent = true; 970 break; 971 } 972 } 973 } 974 } 975 976 // C++ [temp.dep.constexpr]p2: 977 // 978 // An identifier is value-dependent if it is: 979 // - a name declared with a dependent type, 980 if (TypeDependent) 981 ValueDependent = true; 982 // - the name of a non-type template parameter, 983 else if (isa<NonTypeTemplateParmDecl>(VD)) 984 ValueDependent = true; 985 // - a constant with integral or enumeration type and is 986 // initialized with an expression that is value-dependent 987 // (FIXME!). 988 } 989 990 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 991 TypeDependent, ValueDependent, SS)); 992} 993 994Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 995 tok::TokenKind Kind) { 996 PredefinedExpr::IdentType IT; 997 998 switch (Kind) { 999 default: assert(0 && "Unknown simple primary expr!"); 1000 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1001 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1002 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1003 } 1004 1005 // Pre-defined identifiers are of type char[x], where x is the length of the 1006 // string. 1007 unsigned Length; 1008 if (FunctionDecl *FD = getCurFunctionDecl()) 1009 Length = FD->getIdentifier()->getLength(); 1010 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1011 Length = MD->getSynthesizedMethodSize(); 1012 else { 1013 Diag(Loc, diag::ext_predef_outside_function); 1014 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1015 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1016 } 1017 1018 1019 llvm::APInt LengthI(32, Length + 1); 1020 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1021 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1022 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1023} 1024 1025Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1026 llvm::SmallString<16> CharBuffer; 1027 CharBuffer.resize(Tok.getLength()); 1028 const char *ThisTokBegin = &CharBuffer[0]; 1029 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1030 1031 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1032 Tok.getLocation(), PP); 1033 if (Literal.hadError()) 1034 return ExprError(); 1035 1036 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1037 1038 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1039 Literal.isWide(), 1040 type, Tok.getLocation())); 1041} 1042 1043Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1044 // Fast path for a single digit (which is quite common). A single digit 1045 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1046 if (Tok.getLength() == 1) { 1047 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1048 unsigned IntSize = Context.Target.getIntWidth(); 1049 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1050 Context.IntTy, Tok.getLocation())); 1051 } 1052 1053 llvm::SmallString<512> IntegerBuffer; 1054 // Add padding so that NumericLiteralParser can overread by one character. 1055 IntegerBuffer.resize(Tok.getLength()+1); 1056 const char *ThisTokBegin = &IntegerBuffer[0]; 1057 1058 // Get the spelling of the token, which eliminates trigraphs, etc. 1059 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1060 1061 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1062 Tok.getLocation(), PP); 1063 if (Literal.hadError) 1064 return ExprError(); 1065 1066 Expr *Res; 1067 1068 if (Literal.isFloatingLiteral()) { 1069 QualType Ty; 1070 if (Literal.isFloat) 1071 Ty = Context.FloatTy; 1072 else if (!Literal.isLong) 1073 Ty = Context.DoubleTy; 1074 else 1075 Ty = Context.LongDoubleTy; 1076 1077 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1078 1079 // isExact will be set by GetFloatValue(). 1080 bool isExact = false; 1081 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1082 &isExact, Ty, Tok.getLocation()); 1083 1084 } else if (!Literal.isIntegerLiteral()) { 1085 return ExprError(); 1086 } else { 1087 QualType Ty; 1088 1089 // long long is a C99 feature. 1090 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1091 Literal.isLongLong) 1092 Diag(Tok.getLocation(), diag::ext_longlong); 1093 1094 // Get the value in the widest-possible width. 1095 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1096 1097 if (Literal.GetIntegerValue(ResultVal)) { 1098 // If this value didn't fit into uintmax_t, warn and force to ull. 1099 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1100 Ty = Context.UnsignedLongLongTy; 1101 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1102 "long long is not intmax_t?"); 1103 } else { 1104 // If this value fits into a ULL, try to figure out what else it fits into 1105 // according to the rules of C99 6.4.4.1p5. 1106 1107 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1108 // be an unsigned int. 1109 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1110 1111 // Check from smallest to largest, picking the smallest type we can. 1112 unsigned Width = 0; 1113 if (!Literal.isLong && !Literal.isLongLong) { 1114 // Are int/unsigned possibilities? 1115 unsigned IntSize = Context.Target.getIntWidth(); 1116 1117 // Does it fit in a unsigned int? 1118 if (ResultVal.isIntN(IntSize)) { 1119 // Does it fit in a signed int? 1120 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1121 Ty = Context.IntTy; 1122 else if (AllowUnsigned) 1123 Ty = Context.UnsignedIntTy; 1124 Width = IntSize; 1125 } 1126 } 1127 1128 // Are long/unsigned long possibilities? 1129 if (Ty.isNull() && !Literal.isLongLong) { 1130 unsigned LongSize = Context.Target.getLongWidth(); 1131 1132 // Does it fit in a unsigned long? 1133 if (ResultVal.isIntN(LongSize)) { 1134 // Does it fit in a signed long? 1135 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1136 Ty = Context.LongTy; 1137 else if (AllowUnsigned) 1138 Ty = Context.UnsignedLongTy; 1139 Width = LongSize; 1140 } 1141 } 1142 1143 // Finally, check long long if needed. 1144 if (Ty.isNull()) { 1145 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1146 1147 // Does it fit in a unsigned long long? 1148 if (ResultVal.isIntN(LongLongSize)) { 1149 // Does it fit in a signed long long? 1150 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1151 Ty = Context.LongLongTy; 1152 else if (AllowUnsigned) 1153 Ty = Context.UnsignedLongLongTy; 1154 Width = LongLongSize; 1155 } 1156 } 1157 1158 // If we still couldn't decide a type, we probably have something that 1159 // does not fit in a signed long long, but has no U suffix. 1160 if (Ty.isNull()) { 1161 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1162 Ty = Context.UnsignedLongLongTy; 1163 Width = Context.Target.getLongLongWidth(); 1164 } 1165 1166 if (ResultVal.getBitWidth() != Width) 1167 ResultVal.trunc(Width); 1168 } 1169 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1170 } 1171 1172 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1173 if (Literal.isImaginary) 1174 Res = new (Context) ImaginaryLiteral(Res, 1175 Context.getComplexType(Res->getType())); 1176 1177 return Owned(Res); 1178} 1179 1180Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1181 SourceLocation R, ExprArg Val) { 1182 Expr *E = (Expr *)Val.release(); 1183 assert((E != 0) && "ActOnParenExpr() missing expr"); 1184 return Owned(new (Context) ParenExpr(L, R, E)); 1185} 1186 1187/// The UsualUnaryConversions() function is *not* called by this routine. 1188/// See C99 6.3.2.1p[2-4] for more details. 1189bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1190 SourceLocation OpLoc, 1191 const SourceRange &ExprRange, 1192 bool isSizeof) { 1193 if (exprType->isDependentType()) 1194 return false; 1195 1196 // C99 6.5.3.4p1: 1197 if (isa<FunctionType>(exprType)) { 1198 // alignof(function) is allowed. 1199 if (isSizeof) 1200 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1201 return false; 1202 } 1203 1204 if (exprType->isVoidType()) { 1205 Diag(OpLoc, diag::ext_sizeof_void_type) 1206 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1207 return false; 1208 } 1209 1210 return RequireCompleteType(OpLoc, exprType, 1211 isSizeof ? diag::err_sizeof_incomplete_type : 1212 diag::err_alignof_incomplete_type, 1213 ExprRange); 1214} 1215 1216bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1217 const SourceRange &ExprRange) { 1218 E = E->IgnoreParens(); 1219 1220 // alignof decl is always ok. 1221 if (isa<DeclRefExpr>(E)) 1222 return false; 1223 1224 // Cannot know anything else if the expression is dependent. 1225 if (E->isTypeDependent()) 1226 return false; 1227 1228 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1229 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { 1230 if (FD->isBitField()) { 1231 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1232 return true; 1233 } 1234 // Other fields are ok. 1235 return false; 1236 } 1237 } 1238 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1239} 1240 1241/// \brief Build a sizeof or alignof expression given a type operand. 1242Action::OwningExprResult 1243Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1244 bool isSizeOf, SourceRange R) { 1245 if (T.isNull()) 1246 return ExprError(); 1247 1248 if (!T->isDependentType() && 1249 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1250 return ExprError(); 1251 1252 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1253 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1254 Context.getSizeType(), OpLoc, 1255 R.getEnd())); 1256} 1257 1258/// \brief Build a sizeof or alignof expression given an expression 1259/// operand. 1260Action::OwningExprResult 1261Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1262 bool isSizeOf, SourceRange R) { 1263 // Verify that the operand is valid. 1264 bool isInvalid = false; 1265 if (E->isTypeDependent()) { 1266 // Delay type-checking for type-dependent expressions. 1267 } else if (!isSizeOf) { 1268 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1269 } else if (E->isBitField()) { // C99 6.5.3.4p1. 1270 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1271 isInvalid = true; 1272 } else { 1273 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1274 } 1275 1276 if (isInvalid) 1277 return ExprError(); 1278 1279 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1280 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1281 Context.getSizeType(), OpLoc, 1282 R.getEnd())); 1283} 1284 1285/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1286/// the same for @c alignof and @c __alignof 1287/// Note that the ArgRange is invalid if isType is false. 1288Action::OwningExprResult 1289Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1290 void *TyOrEx, const SourceRange &ArgRange) { 1291 // If error parsing type, ignore. 1292 if (TyOrEx == 0) return ExprError(); 1293 1294 if (isType) { 1295 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1296 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1297 } 1298 1299 // Get the end location. 1300 Expr *ArgEx = (Expr *)TyOrEx; 1301 Action::OwningExprResult Result 1302 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1303 1304 if (Result.isInvalid()) 1305 DeleteExpr(ArgEx); 1306 1307 return move(Result); 1308} 1309 1310QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1311 if (V->isTypeDependent()) 1312 return Context.DependentTy; 1313 1314 DefaultFunctionArrayConversion(V); 1315 1316 // These operators return the element type of a complex type. 1317 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1318 return CT->getElementType(); 1319 1320 // Otherwise they pass through real integer and floating point types here. 1321 if (V->getType()->isArithmeticType()) 1322 return V->getType(); 1323 1324 // Reject anything else. 1325 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1326 << (isReal ? "__real" : "__imag"); 1327 return QualType(); 1328} 1329 1330 1331 1332Action::OwningExprResult 1333Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1334 tok::TokenKind Kind, ExprArg Input) { 1335 Expr *Arg = (Expr *)Input.get(); 1336 1337 UnaryOperator::Opcode Opc; 1338 switch (Kind) { 1339 default: assert(0 && "Unknown unary op!"); 1340 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1341 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1342 } 1343 1344 if (getLangOptions().CPlusPlus && 1345 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1346 // Which overloaded operator? 1347 OverloadedOperatorKind OverOp = 1348 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1349 1350 // C++ [over.inc]p1: 1351 // 1352 // [...] If the function is a member function with one 1353 // parameter (which shall be of type int) or a non-member 1354 // function with two parameters (the second of which shall be 1355 // of type int), it defines the postfix increment operator ++ 1356 // for objects of that type. When the postfix increment is 1357 // called as a result of using the ++ operator, the int 1358 // argument will have value zero. 1359 Expr *Args[2] = { 1360 Arg, 1361 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1362 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1363 }; 1364 1365 // Build the candidate set for overloading 1366 OverloadCandidateSet CandidateSet; 1367 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1368 1369 // Perform overload resolution. 1370 OverloadCandidateSet::iterator Best; 1371 switch (BestViableFunction(CandidateSet, Best)) { 1372 case OR_Success: { 1373 // We found a built-in operator or an overloaded operator. 1374 FunctionDecl *FnDecl = Best->Function; 1375 1376 if (FnDecl) { 1377 // We matched an overloaded operator. Build a call to that 1378 // operator. 1379 1380 // Convert the arguments. 1381 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1382 if (PerformObjectArgumentInitialization(Arg, Method)) 1383 return ExprError(); 1384 } else { 1385 // Convert the arguments. 1386 if (PerformCopyInitialization(Arg, 1387 FnDecl->getParamDecl(0)->getType(), 1388 "passing")) 1389 return ExprError(); 1390 } 1391 1392 // Determine the result type 1393 QualType ResultTy 1394 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1395 ResultTy = ResultTy.getNonReferenceType(); 1396 1397 // Build the actual expression node. 1398 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1399 SourceLocation()); 1400 UsualUnaryConversions(FnExpr); 1401 1402 Input.release(); 1403 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1404 Args, 2, ResultTy, 1405 OpLoc)); 1406 } else { 1407 // We matched a built-in operator. Convert the arguments, then 1408 // break out so that we will build the appropriate built-in 1409 // operator node. 1410 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1411 "passing")) 1412 return ExprError(); 1413 1414 break; 1415 } 1416 } 1417 1418 case OR_No_Viable_Function: 1419 // No viable function; fall through to handling this as a 1420 // built-in operator, which will produce an error message for us. 1421 break; 1422 1423 case OR_Ambiguous: 1424 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1425 << UnaryOperator::getOpcodeStr(Opc) 1426 << Arg->getSourceRange(); 1427 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1428 return ExprError(); 1429 1430 case OR_Deleted: 1431 Diag(OpLoc, diag::err_ovl_deleted_oper) 1432 << Best->Function->isDeleted() 1433 << UnaryOperator::getOpcodeStr(Opc) 1434 << Arg->getSourceRange(); 1435 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1436 return ExprError(); 1437 } 1438 1439 // Either we found no viable overloaded operator or we matched a 1440 // built-in operator. In either case, fall through to trying to 1441 // build a built-in operation. 1442 } 1443 1444 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1445 Opc == UnaryOperator::PostInc); 1446 if (result.isNull()) 1447 return ExprError(); 1448 Input.release(); 1449 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1450} 1451 1452Action::OwningExprResult 1453Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1454 ExprArg Idx, SourceLocation RLoc) { 1455 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1456 *RHSExp = static_cast<Expr*>(Idx.get()); 1457 1458 if (getLangOptions().CPlusPlus && 1459 (LHSExp->getType()->isRecordType() || 1460 LHSExp->getType()->isEnumeralType() || 1461 RHSExp->getType()->isRecordType() || 1462 RHSExp->getType()->isEnumeralType())) { 1463 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1464 // to the candidate set. 1465 OverloadCandidateSet CandidateSet; 1466 Expr *Args[2] = { LHSExp, RHSExp }; 1467 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1468 SourceRange(LLoc, RLoc)); 1469 1470 // Perform overload resolution. 1471 OverloadCandidateSet::iterator Best; 1472 switch (BestViableFunction(CandidateSet, Best)) { 1473 case OR_Success: { 1474 // We found a built-in operator or an overloaded operator. 1475 FunctionDecl *FnDecl = Best->Function; 1476 1477 if (FnDecl) { 1478 // We matched an overloaded operator. Build a call to that 1479 // operator. 1480 1481 // Convert the arguments. 1482 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1483 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1484 PerformCopyInitialization(RHSExp, 1485 FnDecl->getParamDecl(0)->getType(), 1486 "passing")) 1487 return ExprError(); 1488 } else { 1489 // Convert the arguments. 1490 if (PerformCopyInitialization(LHSExp, 1491 FnDecl->getParamDecl(0)->getType(), 1492 "passing") || 1493 PerformCopyInitialization(RHSExp, 1494 FnDecl->getParamDecl(1)->getType(), 1495 "passing")) 1496 return ExprError(); 1497 } 1498 1499 // Determine the result type 1500 QualType ResultTy 1501 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1502 ResultTy = ResultTy.getNonReferenceType(); 1503 1504 // Build the actual expression node. 1505 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1506 SourceLocation()); 1507 UsualUnaryConversions(FnExpr); 1508 1509 Base.release(); 1510 Idx.release(); 1511 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1512 FnExpr, Args, 2, 1513 ResultTy, LLoc)); 1514 } else { 1515 // We matched a built-in operator. Convert the arguments, then 1516 // break out so that we will build the appropriate built-in 1517 // operator node. 1518 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1519 "passing") || 1520 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1521 "passing")) 1522 return ExprError(); 1523 1524 break; 1525 } 1526 } 1527 1528 case OR_No_Viable_Function: 1529 // No viable function; fall through to handling this as a 1530 // built-in operator, which will produce an error message for us. 1531 break; 1532 1533 case OR_Ambiguous: 1534 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1535 << "[]" 1536 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1537 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1538 return ExprError(); 1539 1540 case OR_Deleted: 1541 Diag(LLoc, diag::err_ovl_deleted_oper) 1542 << Best->Function->isDeleted() 1543 << "[]" 1544 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1545 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1546 return ExprError(); 1547 } 1548 1549 // Either we found no viable overloaded operator or we matched a 1550 // built-in operator. In either case, fall through to trying to 1551 // build a built-in operation. 1552 } 1553 1554 // Perform default conversions. 1555 DefaultFunctionArrayConversion(LHSExp); 1556 DefaultFunctionArrayConversion(RHSExp); 1557 1558 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1559 1560 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1561 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1562 // in the subscript position. As a result, we need to derive the array base 1563 // and index from the expression types. 1564 Expr *BaseExpr, *IndexExpr; 1565 QualType ResultType; 1566 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1567 BaseExpr = LHSExp; 1568 IndexExpr = RHSExp; 1569 ResultType = Context.DependentTy; 1570 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1571 BaseExpr = LHSExp; 1572 IndexExpr = RHSExp; 1573 // FIXME: need to deal with const... 1574 ResultType = PTy->getPointeeType(); 1575 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1576 // Handle the uncommon case of "123[Ptr]". 1577 BaseExpr = RHSExp; 1578 IndexExpr = LHSExp; 1579 // FIXME: need to deal with const... 1580 ResultType = PTy->getPointeeType(); 1581 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1582 BaseExpr = LHSExp; // vectors: V[123] 1583 IndexExpr = RHSExp; 1584 1585 // FIXME: need to deal with const... 1586 ResultType = VTy->getElementType(); 1587 } else { 1588 return ExprError(Diag(LHSExp->getLocStart(), 1589 diag::err_typecheck_subscript_value) << RHSExp->getSourceRange()); 1590 } 1591 // C99 6.5.2.1p1 1592 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1593 return ExprError(Diag(IndexExpr->getLocStart(), 1594 diag::err_typecheck_subscript) << IndexExpr->getSourceRange()); 1595 1596 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 1597 // the following check catches trying to index a pointer to a function (e.g. 1598 // void (*)(int)) and pointers to incomplete types. Functions are not 1599 // objects in C99. 1600 if (!ResultType->isObjectType() && !ResultType->isDependentType()) 1601 return ExprError(Diag(BaseExpr->getLocStart(), 1602 diag::err_typecheck_subscript_not_object) 1603 << BaseExpr->getType() << BaseExpr->getSourceRange()); 1604 1605 Base.release(); 1606 Idx.release(); 1607 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1608 ResultType, RLoc)); 1609} 1610 1611QualType Sema:: 1612CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1613 IdentifierInfo &CompName, SourceLocation CompLoc) { 1614 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1615 1616 // The vector accessor can't exceed the number of elements. 1617 const char *compStr = CompName.getName(); 1618 1619 // This flag determines whether or not the component is one of the four 1620 // special names that indicate a subset of exactly half the elements are 1621 // to be selected. 1622 bool HalvingSwizzle = false; 1623 1624 // This flag determines whether or not CompName has an 's' char prefix, 1625 // indicating that it is a string of hex values to be used as vector indices. 1626 bool HexSwizzle = *compStr == 's'; 1627 1628 // Check that we've found one of the special components, or that the component 1629 // names must come from the same set. 1630 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1631 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1632 HalvingSwizzle = true; 1633 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1634 do 1635 compStr++; 1636 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1637 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1638 do 1639 compStr++; 1640 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1641 } 1642 1643 if (!HalvingSwizzle && *compStr) { 1644 // We didn't get to the end of the string. This means the component names 1645 // didn't come from the same set *or* we encountered an illegal name. 1646 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1647 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1648 return QualType(); 1649 } 1650 1651 // Ensure no component accessor exceeds the width of the vector type it 1652 // operates on. 1653 if (!HalvingSwizzle) { 1654 compStr = CompName.getName(); 1655 1656 if (HexSwizzle) 1657 compStr++; 1658 1659 while (*compStr) { 1660 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1661 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1662 << baseType << SourceRange(CompLoc); 1663 return QualType(); 1664 } 1665 } 1666 } 1667 1668 // If this is a halving swizzle, verify that the base type has an even 1669 // number of elements. 1670 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1671 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1672 << baseType << SourceRange(CompLoc); 1673 return QualType(); 1674 } 1675 1676 // The component accessor looks fine - now we need to compute the actual type. 1677 // The vector type is implied by the component accessor. For example, 1678 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1679 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1680 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1681 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1682 : CompName.getLength(); 1683 if (HexSwizzle) 1684 CompSize--; 1685 1686 if (CompSize == 1) 1687 return vecType->getElementType(); 1688 1689 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1690 // Now look up the TypeDefDecl from the vector type. Without this, 1691 // diagostics look bad. We want extended vector types to appear built-in. 1692 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1693 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1694 return Context.getTypedefType(ExtVectorDecls[i]); 1695 } 1696 return VT; // should never get here (a typedef type should always be found). 1697} 1698 1699static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1700 IdentifierInfo &Member, 1701 const Selector &Sel) { 1702 1703 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(&Member)) 1704 return PD; 1705 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 1706 return OMD; 1707 1708 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1709 E = PDecl->protocol_end(); I != E; ++I) { 1710 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel)) 1711 return D; 1712 } 1713 return 0; 1714} 1715 1716static Decl *FindGetterNameDecl(const ObjCQualifiedIdType *QIdTy, 1717 IdentifierInfo &Member, 1718 const Selector &Sel) { 1719 // Check protocols on qualified interfaces. 1720 Decl *GDecl = 0; 1721 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1722 E = QIdTy->qual_end(); I != E; ++I) { 1723 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1724 GDecl = PD; 1725 break; 1726 } 1727 // Also must look for a getter name which uses property syntax. 1728 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1729 GDecl = OMD; 1730 break; 1731 } 1732 } 1733 if (!GDecl) { 1734 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1735 E = QIdTy->qual_end(); I != E; ++I) { 1736 // Search in the protocol-qualifier list of current protocol. 1737 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel); 1738 if (GDecl) 1739 return GDecl; 1740 } 1741 } 1742 return GDecl; 1743} 1744 1745Action::OwningExprResult 1746Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1747 tok::TokenKind OpKind, SourceLocation MemberLoc, 1748 IdentifierInfo &Member, 1749 DeclTy *ObjCImpDecl) { 1750 Expr *BaseExpr = static_cast<Expr *>(Base.release()); 1751 assert(BaseExpr && "no record expression"); 1752 1753 // Perform default conversions. 1754 DefaultFunctionArrayConversion(BaseExpr); 1755 1756 QualType BaseType = BaseExpr->getType(); 1757 assert(!BaseType.isNull() && "no type for member expression"); 1758 1759 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1760 // must have pointer type, and the accessed type is the pointee. 1761 if (OpKind == tok::arrow) { 1762 if (const PointerType *PT = BaseType->getAsPointerType()) 1763 BaseType = PT->getPointeeType(); 1764 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1765 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1766 MemberLoc, Member)); 1767 else 1768 return ExprError(Diag(MemberLoc, 1769 diag::err_typecheck_member_reference_arrow) 1770 << BaseType << BaseExpr->getSourceRange()); 1771 } 1772 1773 // Handle field access to simple records. This also handles access to fields 1774 // of the ObjC 'id' struct. 1775 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1776 RecordDecl *RDecl = RTy->getDecl(); 1777 if (RequireCompleteType(OpLoc, BaseType, 1778 diag::err_typecheck_incomplete_tag, 1779 BaseExpr->getSourceRange())) 1780 return ExprError(); 1781 1782 // The record definition is complete, now make sure the member is valid. 1783 // FIXME: Qualified name lookup for C++ is a bit more complicated 1784 // than this. 1785 LookupResult Result 1786 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1787 LookupMemberName, false); 1788 1789 NamedDecl *MemberDecl = 0; 1790 if (!Result) 1791 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1792 << &Member << BaseExpr->getSourceRange()); 1793 else if (Result.isAmbiguous()) { 1794 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1795 MemberLoc, BaseExpr->getSourceRange()); 1796 return ExprError(); 1797 } else 1798 MemberDecl = Result; 1799 1800 // If the decl being referenced had an error, return an error for this 1801 // sub-expr without emitting another error, in order to avoid cascading 1802 // error cases. 1803 if (MemberDecl->isInvalidDecl()) 1804 return ExprError(); 1805 1806 // Check the use of this field 1807 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 1808 return ExprError(); 1809 1810 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1811 // We may have found a field within an anonymous union or struct 1812 // (C++ [class.union]). 1813 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1814 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1815 BaseExpr, OpLoc); 1816 1817 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1818 // FIXME: Handle address space modifiers 1819 QualType MemberType = FD->getType(); 1820 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1821 MemberType = Ref->getPointeeType(); 1822 else { 1823 unsigned combinedQualifiers = 1824 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1825 if (FD->isMutable()) 1826 combinedQualifiers &= ~QualType::Const; 1827 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1828 } 1829 1830 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1831 MemberLoc, MemberType)); 1832 } else if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) 1833 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1834 Var, MemberLoc, 1835 Var->getType().getNonReferenceType())); 1836 else if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 1837 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1838 MemberFn, MemberLoc, MemberFn->getType())); 1839 else if (OverloadedFunctionDecl *Ovl 1840 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 1841 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 1842 MemberLoc, Context.OverloadTy)); 1843 else if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 1844 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1845 Enum, MemberLoc, Enum->getType())); 1846 else if (isa<TypeDecl>(MemberDecl)) 1847 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 1848 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1849 1850 // We found a declaration kind that we didn't expect. This is a 1851 // generic error message that tells the user that she can't refer 1852 // to this member with '.' or '->'. 1853 return ExprError(Diag(MemberLoc, 1854 diag::err_typecheck_member_reference_unknown) 1855 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1856 } 1857 1858 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1859 // (*Obj).ivar. 1860 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1861 ObjCInterfaceDecl *ClassDeclared; 1862 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member, 1863 ClassDeclared)) { 1864 // If the decl being referenced had an error, return an error for this 1865 // sub-expr without emitting another error, in order to avoid cascading 1866 // error cases. 1867 if (IV->isInvalidDecl()) 1868 return ExprError(); 1869 1870 // Check whether we can reference this field. 1871 if (DiagnoseUseOfDecl(IV, MemberLoc)) 1872 return ExprError(); 1873 if (IV->getAccessControl() != ObjCIvarDecl::Public) { 1874 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 1875 if (ObjCMethodDecl *MD = getCurMethodDecl()) 1876 ClassOfMethodDecl = MD->getClassInterface(); 1877 else if (ObjCImpDecl && getCurFunctionDecl()) { 1878 // Case of a c-function declared inside an objc implementation. 1879 // FIXME: For a c-style function nested inside an objc implementation 1880 // class, there is no implementation context available, so we pass down 1881 // the context as argument to this routine. Ideally, this context need 1882 // be passed down in the AST node and somehow calculated from the AST 1883 // for a function decl. 1884 Decl *ImplDecl = static_cast<Decl *>(ObjCImpDecl); 1885 if (ObjCImplementationDecl *IMPD = 1886 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 1887 ClassOfMethodDecl = IMPD->getClassInterface(); 1888 else if (ObjCCategoryImplDecl* CatImplClass = 1889 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 1890 ClassOfMethodDecl = CatImplClass->getClassInterface(); 1891 } 1892 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 1893 if (ClassDeclared != IFTy->getDecl() || 1894 ClassOfMethodDecl != ClassDeclared) 1895 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 1896 } 1897 // @protected 1898 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 1899 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 1900 } 1901 1902 ObjCIvarRefExpr *MRef= new (Context) ObjCIvarRefExpr(IV, IV->getType(), 1903 MemberLoc, BaseExpr, 1904 OpKind == tok::arrow); 1905 Context.setFieldDecl(IFTy->getDecl(), IV, MRef); 1906 return Owned(MRef); 1907 } 1908 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1909 << IFTy->getDecl()->getDeclName() << &Member 1910 << BaseExpr->getSourceRange()); 1911 } 1912 1913 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1914 // pointer to a (potentially qualified) interface type. 1915 const PointerType *PTy; 1916 const ObjCInterfaceType *IFTy; 1917 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1918 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1919 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1920 1921 // Search for a declared property first. 1922 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) { 1923 // Check whether we can reference this property. 1924 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1925 return ExprError(); 1926 1927 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1928 MemberLoc, BaseExpr)); 1929 } 1930 1931 // Check protocols on qualified interfaces. 1932 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1933 E = IFTy->qual_end(); I != E; ++I) 1934 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1935 // Check whether we can reference this property. 1936 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1937 return ExprError(); 1938 1939 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1940 MemberLoc, BaseExpr)); 1941 } 1942 1943 // If that failed, look for an "implicit" property by seeing if the nullary 1944 // selector is implemented. 1945 1946 // FIXME: The logic for looking up nullary and unary selectors should be 1947 // shared with the code in ActOnInstanceMessage. 1948 1949 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1950 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1951 1952 // If this reference is in an @implementation, check for 'private' methods. 1953 if (!Getter) 1954 if (ObjCImplementationDecl *ImpDecl = 1955 ObjCImplementations[IFace->getIdentifier()]) 1956 Getter = ImpDecl->getInstanceMethod(Sel); 1957 1958 // Look through local category implementations associated with the class. 1959 if (!Getter) { 1960 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1961 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1962 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1963 } 1964 } 1965 if (Getter) { 1966 // Check if we can reference this property. 1967 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1968 return ExprError(); 1969 } 1970 // If we found a getter then this may be a valid dot-reference, we 1971 // will look for the matching setter, in case it is needed. 1972 Selector SetterSel = 1973 SelectorTable::constructSetterName(PP.getIdentifierTable(), 1974 PP.getSelectorTable(), &Member); 1975 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1976 if (!Setter) { 1977 // If this reference is in an @implementation, also check for 'private' 1978 // methods. 1979 if (ObjCImplementationDecl *ImpDecl = 1980 ObjCImplementations[IFace->getIdentifier()]) 1981 Setter = ImpDecl->getInstanceMethod(SetterSel); 1982 } 1983 // Look through local category implementations associated with the class. 1984 if (!Setter) { 1985 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 1986 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1987 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 1988 } 1989 } 1990 1991 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1992 return ExprError(); 1993 1994 if (Getter || Setter) { 1995 QualType PType; 1996 1997 if (Getter) 1998 PType = Getter->getResultType(); 1999 else { 2000 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2001 E = Setter->param_end(); PI != E; ++PI) 2002 PType = (*PI)->getType(); 2003 } 2004 // FIXME: we must check that the setter has property type. 2005 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2006 Setter, MemberLoc, BaseExpr)); 2007 } 2008 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2009 << &Member << BaseType); 2010 } 2011 // Handle properties on qualified "id" protocols. 2012 const ObjCQualifiedIdType *QIdTy; 2013 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2014 // Check protocols on qualified interfaces. 2015 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2016 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel)) { 2017 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2018 // Check the use of this declaration 2019 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2020 return ExprError(); 2021 2022 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2023 MemberLoc, BaseExpr)); 2024 } 2025 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2026 // Check the use of this method. 2027 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2028 return ExprError(); 2029 2030 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2031 OMD->getResultType(), 2032 OMD, OpLoc, MemberLoc, 2033 NULL, 0)); 2034 } 2035 } 2036 2037 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2038 << &Member << BaseType); 2039 } 2040 // Handle properties on ObjC 'Class' types. 2041 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2042 // Also must look for a getter name which uses property syntax. 2043 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2044 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2045 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2046 ObjCMethodDecl *Getter; 2047 // FIXME: need to also look locally in the implementation. 2048 if ((Getter = IFace->lookupClassMethod(Sel))) { 2049 // Check the use of this method. 2050 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2051 return ExprError(); 2052 } 2053 // If we found a getter then this may be a valid dot-reference, we 2054 // will look for the matching setter, in case it is needed. 2055 Selector SetterSel = 2056 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2057 PP.getSelectorTable(), &Member); 2058 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2059 if (!Setter) { 2060 // If this reference is in an @implementation, also check for 'private' 2061 // methods. 2062 if (ObjCImplementationDecl *ImpDecl = 2063 ObjCImplementations[IFace->getIdentifier()]) 2064 Setter = ImpDecl->getInstanceMethod(SetterSel); 2065 } 2066 // Look through local category implementations associated with the class. 2067 if (!Setter) { 2068 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2069 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2070 Setter = ObjCCategoryImpls[i]->getClassMethod(SetterSel); 2071 } 2072 } 2073 2074 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2075 return ExprError(); 2076 2077 if (Getter || Setter) { 2078 QualType PType; 2079 2080 if (Getter) 2081 PType = Getter->getResultType(); 2082 else { 2083 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2084 E = Setter->param_end(); PI != E; ++PI) 2085 PType = (*PI)->getType(); 2086 } 2087 // FIXME: we must check that the setter has property type. 2088 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2089 Setter, MemberLoc, BaseExpr)); 2090 } 2091 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2092 << &Member << BaseType); 2093 } 2094 } 2095 2096 // Handle 'field access' to vectors, such as 'V.xx'. 2097 if (BaseType->isExtVectorType()) { 2098 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2099 if (ret.isNull()) 2100 return ExprError(); 2101 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2102 MemberLoc)); 2103 } 2104 2105 return ExprError(Diag(MemberLoc, 2106 diag::err_typecheck_member_reference_struct_union) 2107 << BaseType << BaseExpr->getSourceRange()); 2108} 2109 2110/// ConvertArgumentsForCall - Converts the arguments specified in 2111/// Args/NumArgs to the parameter types of the function FDecl with 2112/// function prototype Proto. Call is the call expression itself, and 2113/// Fn is the function expression. For a C++ member function, this 2114/// routine does not attempt to convert the object argument. Returns 2115/// true if the call is ill-formed. 2116bool 2117Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2118 FunctionDecl *FDecl, 2119 const FunctionProtoType *Proto, 2120 Expr **Args, unsigned NumArgs, 2121 SourceLocation RParenLoc) { 2122 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2123 // assignment, to the types of the corresponding parameter, ... 2124 unsigned NumArgsInProto = Proto->getNumArgs(); 2125 unsigned NumArgsToCheck = NumArgs; 2126 bool Invalid = false; 2127 2128 // If too few arguments are available (and we don't have default 2129 // arguments for the remaining parameters), don't make the call. 2130 if (NumArgs < NumArgsInProto) { 2131 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2132 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2133 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2134 // Use default arguments for missing arguments 2135 NumArgsToCheck = NumArgsInProto; 2136 Call->setNumArgs(Context, NumArgsInProto); 2137 } 2138 2139 // If too many are passed and not variadic, error on the extras and drop 2140 // them. 2141 if (NumArgs > NumArgsInProto) { 2142 if (!Proto->isVariadic()) { 2143 Diag(Args[NumArgsInProto]->getLocStart(), 2144 diag::err_typecheck_call_too_many_args) 2145 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2146 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2147 Args[NumArgs-1]->getLocEnd()); 2148 // This deletes the extra arguments. 2149 Call->setNumArgs(Context, NumArgsInProto); 2150 Invalid = true; 2151 } 2152 NumArgsToCheck = NumArgsInProto; 2153 } 2154 2155 // Continue to check argument types (even if we have too few/many args). 2156 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2157 QualType ProtoArgType = Proto->getArgType(i); 2158 2159 Expr *Arg; 2160 if (i < NumArgs) { 2161 Arg = Args[i]; 2162 2163 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2164 ProtoArgType, 2165 diag::err_call_incomplete_argument, 2166 Arg->getSourceRange())) 2167 return true; 2168 2169 // Pass the argument. 2170 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2171 return true; 2172 } else 2173 // We already type-checked the argument, so we know it works. 2174 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2175 QualType ArgType = Arg->getType(); 2176 2177 Call->setArg(i, Arg); 2178 } 2179 2180 // If this is a variadic call, handle args passed through "...". 2181 if (Proto->isVariadic()) { 2182 VariadicCallType CallType = VariadicFunction; 2183 if (Fn->getType()->isBlockPointerType()) 2184 CallType = VariadicBlock; // Block 2185 else if (isa<MemberExpr>(Fn)) 2186 CallType = VariadicMethod; 2187 2188 // Promote the arguments (C99 6.5.2.2p7). 2189 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2190 Expr *Arg = Args[i]; 2191 DefaultVariadicArgumentPromotion(Arg, CallType); 2192 Call->setArg(i, Arg); 2193 } 2194 } 2195 2196 return Invalid; 2197} 2198 2199/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2200/// This provides the location of the left/right parens and a list of comma 2201/// locations. 2202Action::OwningExprResult 2203Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2204 MultiExprArg args, 2205 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2206 unsigned NumArgs = args.size(); 2207 Expr *Fn = static_cast<Expr *>(fn.release()); 2208 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2209 assert(Fn && "no function call expression"); 2210 FunctionDecl *FDecl = NULL; 2211 DeclarationName UnqualifiedName; 2212 2213 if (getLangOptions().CPlusPlus) { 2214 // Determine whether this is a dependent call inside a C++ template, 2215 // in which case we won't do any semantic analysis now. 2216 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 2217 bool Dependent = false; 2218 if (Fn->isTypeDependent()) 2219 Dependent = true; 2220 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2221 Dependent = true; 2222 2223 if (Dependent) 2224 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2225 Context.DependentTy, RParenLoc)); 2226 2227 // Determine whether this is a call to an object (C++ [over.call.object]). 2228 if (Fn->getType()->isRecordType()) 2229 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2230 CommaLocs, RParenLoc)); 2231 2232 // Determine whether this is a call to a member function. 2233 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2234 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2235 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2236 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2237 CommaLocs, RParenLoc)); 2238 } 2239 2240 // If we're directly calling a function, get the appropriate declaration. 2241 DeclRefExpr *DRExpr = NULL; 2242 Expr *FnExpr = Fn; 2243 bool ADL = true; 2244 while (true) { 2245 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2246 FnExpr = IcExpr->getSubExpr(); 2247 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2248 // Parentheses around a function disable ADL 2249 // (C++0x [basic.lookup.argdep]p1). 2250 ADL = false; 2251 FnExpr = PExpr->getSubExpr(); 2252 } else if (isa<UnaryOperator>(FnExpr) && 2253 cast<UnaryOperator>(FnExpr)->getOpcode() 2254 == UnaryOperator::AddrOf) { 2255 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2256 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2257 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2258 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2259 break; 2260 } else if (UnresolvedFunctionNameExpr *DepName 2261 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2262 UnqualifiedName = DepName->getName(); 2263 break; 2264 } else { 2265 // Any kind of name that does not refer to a declaration (or 2266 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2267 ADL = false; 2268 break; 2269 } 2270 } 2271 2272 OverloadedFunctionDecl *Ovl = 0; 2273 if (DRExpr) { 2274 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2275 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2276 } 2277 2278 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2279 // We don't perform ADL for implicit declarations of builtins. 2280 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2281 ADL = false; 2282 2283 // We don't perform ADL in C. 2284 if (!getLangOptions().CPlusPlus) 2285 ADL = false; 2286 2287 if (Ovl || ADL) { 2288 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2289 UnqualifiedName, LParenLoc, Args, 2290 NumArgs, CommaLocs, RParenLoc, ADL); 2291 if (!FDecl) 2292 return ExprError(); 2293 2294 // Update Fn to refer to the actual function selected. 2295 Expr *NewFn = 0; 2296 if (QualifiedDeclRefExpr *QDRExpr 2297 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2298 NewFn = QualifiedDeclRefExpr::Create(Context, FDecl, FDecl->getType(), 2299 QDRExpr->getLocation(), 2300 false, false, 2301 QDRExpr->getQualifierRange(), 2302 QDRExpr->begin(), 2303 QDRExpr->size()); 2304 else 2305 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2306 Fn->getSourceRange().getBegin()); 2307 Fn->Destroy(Context); 2308 Fn = NewFn; 2309 } 2310 } 2311 2312 // Promote the function operand. 2313 UsualUnaryConversions(Fn); 2314 2315 // Make the call expr early, before semantic checks. This guarantees cleanup 2316 // of arguments and function on error. 2317 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2318 Args, NumArgs, 2319 Context.BoolTy, 2320 RParenLoc)); 2321 2322 const FunctionType *FuncT; 2323 if (!Fn->getType()->isBlockPointerType()) { 2324 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2325 // have type pointer to function". 2326 const PointerType *PT = Fn->getType()->getAsPointerType(); 2327 if (PT == 0) 2328 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2329 << Fn->getType() << Fn->getSourceRange()); 2330 FuncT = PT->getPointeeType()->getAsFunctionType(); 2331 } else { // This is a block call. 2332 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2333 getAsFunctionType(); 2334 } 2335 if (FuncT == 0) 2336 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2337 << Fn->getType() << Fn->getSourceRange()); 2338 2339 // Check for a valid return type 2340 if (!FuncT->getResultType()->isVoidType() && 2341 RequireCompleteType(Fn->getSourceRange().getBegin(), 2342 FuncT->getResultType(), 2343 diag::err_call_incomplete_return, 2344 TheCall->getSourceRange())) 2345 return ExprError(); 2346 2347 // We know the result type of the call, set it. 2348 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2349 2350 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2351 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2352 RParenLoc)) 2353 return ExprError(); 2354 } else { 2355 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2356 2357 // Promote the arguments (C99 6.5.2.2p6). 2358 for (unsigned i = 0; i != NumArgs; i++) { 2359 Expr *Arg = Args[i]; 2360 DefaultArgumentPromotion(Arg); 2361 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2362 Arg->getType(), 2363 diag::err_call_incomplete_argument, 2364 Arg->getSourceRange())) 2365 return ExprError(); 2366 TheCall->setArg(i, Arg); 2367 } 2368 } 2369 2370 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2371 if (!Method->isStatic()) 2372 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2373 << Fn->getSourceRange()); 2374 2375 // Do special checking on direct calls to functions. 2376 if (FDecl) 2377 return CheckFunctionCall(FDecl, TheCall.take()); 2378 2379 return Owned(TheCall.take()); 2380} 2381 2382Action::OwningExprResult 2383Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2384 SourceLocation RParenLoc, ExprArg InitExpr) { 2385 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2386 QualType literalType = QualType::getFromOpaquePtr(Ty); 2387 // FIXME: put back this assert when initializers are worked out. 2388 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2389 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2390 2391 if (literalType->isArrayType()) { 2392 if (literalType->isVariableArrayType()) 2393 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2394 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2395 } else if (RequireCompleteType(LParenLoc, literalType, 2396 diag::err_typecheck_decl_incomplete_type, 2397 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2398 return ExprError(); 2399 2400 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2401 DeclarationName(), /*FIXME:DirectInit=*/false)) 2402 return ExprError(); 2403 2404 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2405 if (isFileScope) { // 6.5.2.5p3 2406 if (CheckForConstantInitializer(literalExpr, literalType)) 2407 return ExprError(); 2408 } 2409 InitExpr.release(); 2410 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2411 literalExpr, isFileScope)); 2412} 2413 2414Action::OwningExprResult 2415Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2416 SourceLocation RBraceLoc) { 2417 unsigned NumInit = initlist.size(); 2418 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2419 2420 // Semantic analysis for initializers is done by ActOnDeclarator() and 2421 // CheckInitializer() - it requires knowledge of the object being intialized. 2422 2423 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2424 RBraceLoc); 2425 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2426 return Owned(E); 2427} 2428 2429/// CheckCastTypes - Check type constraints for casting between types. 2430bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2431 UsualUnaryConversions(castExpr); 2432 2433 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2434 // type needs to be scalar. 2435 if (castType->isVoidType()) { 2436 // Cast to void allows any expr type. 2437 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2438 // We can't check any more until template instantiation time. 2439 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2440 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2441 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2442 (castType->isStructureType() || castType->isUnionType())) { 2443 // GCC struct/union extension: allow cast to self. 2444 // FIXME: Check that the cast destination type is complete. 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 // FIXME: Type of conditional expression must be complete in C mode. 2559 } 2560 2561 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2562 // The following || allows only one side to be void (a GCC-ism). 2563 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2564 if (!LHSTy->isVoidType()) 2565 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2566 << RHS->getSourceRange(); 2567 if (!RHSTy->isVoidType()) 2568 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2569 << LHS->getSourceRange(); 2570 ImpCastExprToType(LHS, Context.VoidTy); 2571 ImpCastExprToType(RHS, Context.VoidTy); 2572 return Context.VoidTy; 2573 } 2574 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2575 // the type of the other operand." 2576 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2577 Context.isObjCObjectPointerType(LHSTy)) && 2578 RHS->isNullPointerConstant(Context)) { 2579 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2580 return LHSTy; 2581 } 2582 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2583 Context.isObjCObjectPointerType(RHSTy)) && 2584 LHS->isNullPointerConstant(Context)) { 2585 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2586 return RHSTy; 2587 } 2588 2589 // Handle the case where both operands are pointers before we handle null 2590 // pointer constants in case both operands are null pointer constants. 2591 if (const PointerType *LHSPT = LHSTy->getAsPointerType()) { // C99 6.5.15p3,6 2592 if (const PointerType *RHSPT = RHSTy->getAsPointerType()) { 2593 // get the "pointed to" types 2594 QualType lhptee = LHSPT->getPointeeType(); 2595 QualType rhptee = RHSPT->getPointeeType(); 2596 2597 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2598 if (lhptee->isVoidType() && 2599 rhptee->isIncompleteOrObjectType()) { 2600 // Figure out necessary qualifiers (C99 6.5.15p6) 2601 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2602 QualType destType = Context.getPointerType(destPointee); 2603 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2604 ImpCastExprToType(RHS, destType); // promote to void* 2605 return destType; 2606 } 2607 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2608 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2609 QualType destType = Context.getPointerType(destPointee); 2610 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2611 ImpCastExprToType(RHS, destType); // promote to void* 2612 return destType; 2613 } 2614 2615 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2616 // Two identical pointer types are always compatible. 2617 return LHSTy; 2618 } 2619 2620 QualType compositeType = LHSTy; 2621 2622 // If either type is an Objective-C object type then check 2623 // compatibility according to Objective-C. 2624 if (Context.isObjCObjectPointerType(LHSTy) || 2625 Context.isObjCObjectPointerType(RHSTy)) { 2626 // If both operands are interfaces and either operand can be 2627 // assigned to the other, use that type as the composite 2628 // type. This allows 2629 // xxx ? (A*) a : (B*) b 2630 // where B is a subclass of A. 2631 // 2632 // Additionally, as for assignment, if either type is 'id' 2633 // allow silent coercion. Finally, if the types are 2634 // incompatible then make sure to use 'id' as the composite 2635 // type so the result is acceptable for sending messages to. 2636 2637 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2638 // It could return the composite type. 2639 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2640 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2641 if (LHSIface && RHSIface && 2642 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2643 compositeType = LHSTy; 2644 } else if (LHSIface && RHSIface && 2645 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2646 compositeType = RHSTy; 2647 } else if (Context.isObjCIdStructType(lhptee) || 2648 Context.isObjCIdStructType(rhptee)) { 2649 compositeType = Context.getObjCIdType(); 2650 } else { 2651 Diag(QuestionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2652 << LHSTy << RHSTy 2653 << LHS->getSourceRange() << RHS->getSourceRange(); 2654 QualType incompatTy = Context.getObjCIdType(); 2655 ImpCastExprToType(LHS, incompatTy); 2656 ImpCastExprToType(RHS, incompatTy); 2657 return incompatTy; 2658 } 2659 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2660 rhptee.getUnqualifiedType())) { 2661 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2662 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2663 // In this situation, we assume void* type. No especially good 2664 // reason, but this is what gcc does, and we do have to pick 2665 // to get a consistent AST. 2666 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2667 ImpCastExprToType(LHS, incompatTy); 2668 ImpCastExprToType(RHS, incompatTy); 2669 return incompatTy; 2670 } 2671 // The pointer types are compatible. 2672 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2673 // differently qualified versions of compatible types, the result type is 2674 // a pointer to an appropriately qualified version of the *composite* 2675 // type. 2676 // FIXME: Need to calculate the composite type. 2677 // FIXME: Need to add qualifiers 2678 ImpCastExprToType(LHS, compositeType); 2679 ImpCastExprToType(RHS, compositeType); 2680 return compositeType; 2681 } 2682 } 2683 2684 // Selection between block pointer types is ok as long as they are the same. 2685 if (LHSTy->isBlockPointerType() && RHSTy->isBlockPointerType() && 2686 Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) 2687 return LHSTy; 2688 2689 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2690 // evaluates to "struct objc_object *" (and is handled above when comparing 2691 // id with statically typed objects). 2692 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 2693 // GCC allows qualified id and any Objective-C type to devolve to 2694 // id. Currently localizing to here until clear this should be 2695 // part of ObjCQualifiedIdTypesAreCompatible. 2696 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 2697 (LHSTy->isObjCQualifiedIdType() && 2698 Context.isObjCObjectPointerType(RHSTy)) || 2699 (RHSTy->isObjCQualifiedIdType() && 2700 Context.isObjCObjectPointerType(LHSTy))) { 2701 // FIXME: This is not the correct composite type. This only 2702 // happens to work because id can more or less be used anywhere, 2703 // however this may change the type of method sends. 2704 // FIXME: gcc adds some type-checking of the arguments and emits 2705 // (confusing) incompatible comparison warnings in some 2706 // cases. Investigate. 2707 QualType compositeType = Context.getObjCIdType(); 2708 ImpCastExprToType(LHS, compositeType); 2709 ImpCastExprToType(RHS, compositeType); 2710 return compositeType; 2711 } 2712 } 2713 2714 // Otherwise, the operands are not compatible. 2715 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2716 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2717 return QualType(); 2718} 2719 2720/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2721/// in the case of a the GNU conditional expr extension. 2722Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2723 SourceLocation ColonLoc, 2724 ExprArg Cond, ExprArg LHS, 2725 ExprArg RHS) { 2726 Expr *CondExpr = (Expr *) Cond.get(); 2727 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2728 2729 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2730 // was the condition. 2731 bool isLHSNull = LHSExpr == 0; 2732 if (isLHSNull) 2733 LHSExpr = CondExpr; 2734 2735 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2736 RHSExpr, QuestionLoc); 2737 if (result.isNull()) 2738 return ExprError(); 2739 2740 Cond.release(); 2741 LHS.release(); 2742 RHS.release(); 2743 return Owned(new (Context) ConditionalOperator(CondExpr, 2744 isLHSNull ? 0 : LHSExpr, 2745 RHSExpr, result)); 2746} 2747 2748 2749// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2750// being closely modeled after the C99 spec:-). The odd characteristic of this 2751// routine is it effectively iqnores the qualifiers on the top level pointee. 2752// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2753// FIXME: add a couple examples in this comment. 2754Sema::AssignConvertType 2755Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2756 QualType lhptee, rhptee; 2757 2758 // get the "pointed to" type (ignoring qualifiers at the top level) 2759 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2760 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2761 2762 // make sure we operate on the canonical type 2763 lhptee = Context.getCanonicalType(lhptee); 2764 rhptee = Context.getCanonicalType(rhptee); 2765 2766 AssignConvertType ConvTy = Compatible; 2767 2768 // C99 6.5.16.1p1: This following citation is common to constraints 2769 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2770 // qualifiers of the type *pointed to* by the right; 2771 // FIXME: Handle ExtQualType 2772 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2773 ConvTy = CompatiblePointerDiscardsQualifiers; 2774 2775 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2776 // incomplete type and the other is a pointer to a qualified or unqualified 2777 // version of void... 2778 if (lhptee->isVoidType()) { 2779 if (rhptee->isIncompleteOrObjectType()) 2780 return ConvTy; 2781 2782 // As an extension, we allow cast to/from void* to function pointer. 2783 assert(rhptee->isFunctionType()); 2784 return FunctionVoidPointer; 2785 } 2786 2787 if (rhptee->isVoidType()) { 2788 if (lhptee->isIncompleteOrObjectType()) 2789 return ConvTy; 2790 2791 // As an extension, we allow cast to/from void* to function pointer. 2792 assert(lhptee->isFunctionType()); 2793 return FunctionVoidPointer; 2794 } 2795 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2796 // unqualified versions of compatible types, ... 2797 lhptee = lhptee.getUnqualifiedType(); 2798 rhptee = rhptee.getUnqualifiedType(); 2799 if (!Context.typesAreCompatible(lhptee, rhptee)) { 2800 // Check if the pointee types are compatible ignoring the sign. 2801 // We explicitly check for char so that we catch "char" vs 2802 // "unsigned char" on systems where "char" is unsigned. 2803 if (lhptee->isCharType()) { 2804 lhptee = Context.UnsignedCharTy; 2805 } else if (lhptee->isSignedIntegerType()) { 2806 lhptee = Context.getCorrespondingUnsignedType(lhptee); 2807 } 2808 if (rhptee->isCharType()) { 2809 rhptee = Context.UnsignedCharTy; 2810 } else if (rhptee->isSignedIntegerType()) { 2811 rhptee = Context.getCorrespondingUnsignedType(rhptee); 2812 } 2813 if (lhptee == rhptee) { 2814 // Types are compatible ignoring the sign. Qualifier incompatibility 2815 // takes priority over sign incompatibility because the sign 2816 // warning can be disabled. 2817 if (ConvTy != Compatible) 2818 return ConvTy; 2819 return IncompatiblePointerSign; 2820 } 2821 // General pointer incompatibility takes priority over qualifiers. 2822 return IncompatiblePointer; 2823 } 2824 return ConvTy; 2825} 2826 2827/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2828/// block pointer types are compatible or whether a block and normal pointer 2829/// are compatible. It is more restrict than comparing two function pointer 2830// types. 2831Sema::AssignConvertType 2832Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2833 QualType rhsType) { 2834 QualType lhptee, rhptee; 2835 2836 // get the "pointed to" type (ignoring qualifiers at the top level) 2837 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2838 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2839 2840 // make sure we operate on the canonical type 2841 lhptee = Context.getCanonicalType(lhptee); 2842 rhptee = Context.getCanonicalType(rhptee); 2843 2844 AssignConvertType ConvTy = Compatible; 2845 2846 // For blocks we enforce that qualifiers are identical. 2847 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2848 ConvTy = CompatiblePointerDiscardsQualifiers; 2849 2850 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2851 return IncompatibleBlockPointer; 2852 return ConvTy; 2853} 2854 2855/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2856/// has code to accommodate several GCC extensions when type checking 2857/// pointers. Here are some objectionable examples that GCC considers warnings: 2858/// 2859/// int a, *pint; 2860/// short *pshort; 2861/// struct foo *pfoo; 2862/// 2863/// pint = pshort; // warning: assignment from incompatible pointer type 2864/// a = pint; // warning: assignment makes integer from pointer without a cast 2865/// pint = a; // warning: assignment makes pointer from integer without a cast 2866/// pint = pfoo; // warning: assignment from incompatible pointer type 2867/// 2868/// As a result, the code for dealing with pointers is more complex than the 2869/// C99 spec dictates. 2870/// 2871Sema::AssignConvertType 2872Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2873 // Get canonical types. We're not formatting these types, just comparing 2874 // them. 2875 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2876 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2877 2878 if (lhsType == rhsType) 2879 return Compatible; // Common case: fast path an exact match. 2880 2881 // If the left-hand side is a reference type, then we are in a 2882 // (rare!) case where we've allowed the use of references in C, 2883 // e.g., as a parameter type in a built-in function. In this case, 2884 // just make sure that the type referenced is compatible with the 2885 // right-hand side type. The caller is responsible for adjusting 2886 // lhsType so that the resulting expression does not have reference 2887 // type. 2888 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2889 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2890 return Compatible; 2891 return Incompatible; 2892 } 2893 2894 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 2895 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 2896 return Compatible; 2897 // Relax integer conversions like we do for pointers below. 2898 if (rhsType->isIntegerType()) 2899 return IntToPointer; 2900 if (lhsType->isIntegerType()) 2901 return PointerToInt; 2902 return IncompatibleObjCQualifiedId; 2903 } 2904 2905 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2906 // For ExtVector, allow vector splats; float -> <n x float> 2907 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2908 if (LV->getElementType() == rhsType) 2909 return Compatible; 2910 2911 // If we are allowing lax vector conversions, and LHS and RHS are both 2912 // vectors, the total size only needs to be the same. This is a bitcast; 2913 // no bits are changed but the result type is different. 2914 if (getLangOptions().LaxVectorConversions && 2915 lhsType->isVectorType() && rhsType->isVectorType()) { 2916 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2917 return IncompatibleVectors; 2918 } 2919 return Incompatible; 2920 } 2921 2922 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2923 return Compatible; 2924 2925 if (isa<PointerType>(lhsType)) { 2926 if (rhsType->isIntegerType()) 2927 return IntToPointer; 2928 2929 if (isa<PointerType>(rhsType)) 2930 return CheckPointerTypesForAssignment(lhsType, rhsType); 2931 2932 if (rhsType->getAsBlockPointerType()) { 2933 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2934 return Compatible; 2935 2936 // Treat block pointers as objects. 2937 if (getLangOptions().ObjC1 && 2938 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2939 return Compatible; 2940 } 2941 return Incompatible; 2942 } 2943 2944 if (isa<BlockPointerType>(lhsType)) { 2945 if (rhsType->isIntegerType()) 2946 return IntToBlockPointer; 2947 2948 // Treat block pointers as objects. 2949 if (getLangOptions().ObjC1 && 2950 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2951 return Compatible; 2952 2953 if (rhsType->isBlockPointerType()) 2954 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2955 2956 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2957 if (RHSPT->getPointeeType()->isVoidType()) 2958 return Compatible; 2959 } 2960 return Incompatible; 2961 } 2962 2963 if (isa<PointerType>(rhsType)) { 2964 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2965 if (lhsType == Context.BoolTy) 2966 return Compatible; 2967 2968 if (lhsType->isIntegerType()) 2969 return PointerToInt; 2970 2971 if (isa<PointerType>(lhsType)) 2972 return CheckPointerTypesForAssignment(lhsType, rhsType); 2973 2974 if (isa<BlockPointerType>(lhsType) && 2975 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2976 return Compatible; 2977 return Incompatible; 2978 } 2979 2980 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 2981 if (Context.typesAreCompatible(lhsType, rhsType)) 2982 return Compatible; 2983 } 2984 return Incompatible; 2985} 2986 2987Sema::AssignConvertType 2988Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2989 if (getLangOptions().CPlusPlus) { 2990 if (!lhsType->isRecordType()) { 2991 // C++ 5.17p3: If the left operand is not of class type, the 2992 // expression is implicitly converted (C++ 4) to the 2993 // cv-unqualified type of the left operand. 2994 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 2995 "assigning")) 2996 return Incompatible; 2997 else 2998 return Compatible; 2999 } 3000 3001 // FIXME: Currently, we fall through and treat C++ classes like C 3002 // structures. 3003 } 3004 3005 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3006 // a null pointer constant. 3007 if ((lhsType->isPointerType() || 3008 lhsType->isObjCQualifiedIdType() || 3009 lhsType->isBlockPointerType()) 3010 && rExpr->isNullPointerConstant(Context)) { 3011 ImpCastExprToType(rExpr, lhsType); 3012 return Compatible; 3013 } 3014 3015 // This check seems unnatural, however it is necessary to ensure the proper 3016 // conversion of functions/arrays. If the conversion were done for all 3017 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3018 // expressions that surpress this implicit conversion (&, sizeof). 3019 // 3020 // Suppress this for references: C++ 8.5.3p5. 3021 if (!lhsType->isReferenceType()) 3022 DefaultFunctionArrayConversion(rExpr); 3023 3024 Sema::AssignConvertType result = 3025 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3026 3027 // C99 6.5.16.1p2: The value of the right operand is converted to the 3028 // type of the assignment expression. 3029 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3030 // so that we can use references in built-in functions even in C. 3031 // The getNonReferenceType() call makes sure that the resulting expression 3032 // does not have reference type. 3033 if (rExpr->getType() != lhsType) 3034 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3035 return result; 3036} 3037 3038Sema::AssignConvertType 3039Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 3040 return CheckAssignmentConstraints(lhsType, rhsType); 3041} 3042 3043QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3044 Diag(Loc, diag::err_typecheck_invalid_operands) 3045 << lex->getType() << rex->getType() 3046 << lex->getSourceRange() << rex->getSourceRange(); 3047 return QualType(); 3048} 3049 3050inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3051 Expr *&rex) { 3052 // For conversion purposes, we ignore any qualifiers. 3053 // For example, "const float" and "float" are equivalent. 3054 QualType lhsType = 3055 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3056 QualType rhsType = 3057 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3058 3059 // If the vector types are identical, return. 3060 if (lhsType == rhsType) 3061 return lhsType; 3062 3063 // Handle the case of a vector & extvector type of the same size and element 3064 // type. It would be nice if we only had one vector type someday. 3065 if (getLangOptions().LaxVectorConversions) { 3066 // FIXME: Should we warn here? 3067 if (const VectorType *LV = lhsType->getAsVectorType()) { 3068 if (const VectorType *RV = rhsType->getAsVectorType()) 3069 if (LV->getElementType() == RV->getElementType() && 3070 LV->getNumElements() == RV->getNumElements()) { 3071 return lhsType->isExtVectorType() ? lhsType : rhsType; 3072 } 3073 } 3074 } 3075 3076 // If the lhs is an extended vector and the rhs is a scalar of the same type 3077 // or a literal, promote the rhs to the vector type. 3078 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3079 QualType eltType = V->getElementType(); 3080 3081 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3082 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3083 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3084 ImpCastExprToType(rex, lhsType); 3085 return lhsType; 3086 } 3087 } 3088 3089 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3090 // promote the lhs to the vector type. 3091 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3092 QualType eltType = V->getElementType(); 3093 3094 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3095 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3096 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3097 ImpCastExprToType(lex, rhsType); 3098 return rhsType; 3099 } 3100 } 3101 3102 // You cannot convert between vector values of different size. 3103 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3104 << lex->getType() << rex->getType() 3105 << lex->getSourceRange() << rex->getSourceRange(); 3106 return QualType(); 3107} 3108 3109inline QualType Sema::CheckMultiplyDivideOperands( 3110 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3111{ 3112 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3113 return CheckVectorOperands(Loc, lex, rex); 3114 3115 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3116 3117 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3118 return compType; 3119 return InvalidOperands(Loc, lex, rex); 3120} 3121 3122inline QualType Sema::CheckRemainderOperands( 3123 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3124{ 3125 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3126 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3127 return CheckVectorOperands(Loc, lex, rex); 3128 return InvalidOperands(Loc, lex, rex); 3129 } 3130 3131 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3132 3133 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3134 return compType; 3135 return InvalidOperands(Loc, lex, rex); 3136} 3137 3138inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3139 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3140{ 3141 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3142 return CheckVectorOperands(Loc, lex, rex); 3143 3144 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3145 3146 // handle the common case first (both operands are arithmetic). 3147 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3148 return compType; 3149 3150 // Put any potential pointer into PExp 3151 Expr* PExp = lex, *IExp = rex; 3152 if (IExp->getType()->isPointerType()) 3153 std::swap(PExp, IExp); 3154 3155 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 3156 if (IExp->getType()->isIntegerType()) { 3157 // Check for arithmetic on pointers to incomplete types 3158 if (!PTy->getPointeeType()->isObjectType()) { 3159 if (PTy->getPointeeType()->isVoidType()) { 3160 if (getLangOptions().CPlusPlus) { 3161 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3162 << lex->getSourceRange() << rex->getSourceRange(); 3163 return QualType(); 3164 } 3165 3166 // GNU extension: arithmetic on pointer to void 3167 Diag(Loc, diag::ext_gnu_void_ptr) 3168 << lex->getSourceRange() << rex->getSourceRange(); 3169 } else if (PTy->getPointeeType()->isFunctionType()) { 3170 if (getLangOptions().CPlusPlus) { 3171 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3172 << lex->getType() << lex->getSourceRange(); 3173 return QualType(); 3174 } 3175 3176 // GNU extension: arithmetic on pointer to function 3177 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3178 << lex->getType() << lex->getSourceRange(); 3179 } else { 3180 RequireCompleteType(Loc, PTy->getPointeeType(), 3181 diag::err_typecheck_arithmetic_incomplete_type, 3182 lex->getSourceRange(), SourceRange(), 3183 lex->getType()); 3184 return QualType(); 3185 } 3186 } 3187 return PExp->getType(); 3188 } 3189 } 3190 3191 return InvalidOperands(Loc, lex, rex); 3192} 3193 3194// C99 6.5.6 3195QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3196 SourceLocation Loc, bool isCompAssign) { 3197 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3198 return CheckVectorOperands(Loc, lex, rex); 3199 3200 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3201 3202 // Enforce type constraints: C99 6.5.6p3. 3203 3204 // Handle the common case first (both operands are arithmetic). 3205 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3206 return compType; 3207 3208 // Either ptr - int or ptr - ptr. 3209 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3210 QualType lpointee = LHSPTy->getPointeeType(); 3211 3212 // The LHS must be an object type, not incomplete, function, etc. 3213 if (!lpointee->isObjectType()) { 3214 // Handle the GNU void* extension. 3215 if (lpointee->isVoidType()) { 3216 Diag(Loc, diag::ext_gnu_void_ptr) 3217 << lex->getSourceRange() << rex->getSourceRange(); 3218 } else if (lpointee->isFunctionType()) { 3219 if (getLangOptions().CPlusPlus) { 3220 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3221 << lex->getType() << lex->getSourceRange(); 3222 return QualType(); 3223 } 3224 3225 // GNU extension: arithmetic on pointer to function 3226 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3227 << lex->getType() << lex->getSourceRange(); 3228 } else { 3229 Diag(Loc, diag::err_typecheck_sub_ptr_object) 3230 << lex->getType() << lex->getSourceRange(); 3231 return QualType(); 3232 } 3233 } 3234 3235 // The result type of a pointer-int computation is the pointer type. 3236 if (rex->getType()->isIntegerType()) 3237 return lex->getType(); 3238 3239 // Handle pointer-pointer subtractions. 3240 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3241 QualType rpointee = RHSPTy->getPointeeType(); 3242 3243 // RHS must be an object type, unless void (GNU). 3244 if (!rpointee->isObjectType()) { 3245 // Handle the GNU void* extension. 3246 if (rpointee->isVoidType()) { 3247 if (!lpointee->isVoidType()) 3248 Diag(Loc, diag::ext_gnu_void_ptr) 3249 << lex->getSourceRange() << rex->getSourceRange(); 3250 } else if (rpointee->isFunctionType()) { 3251 if (getLangOptions().CPlusPlus) { 3252 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3253 << rex->getType() << rex->getSourceRange(); 3254 return QualType(); 3255 } 3256 3257 // GNU extension: arithmetic on pointer to function 3258 if (!lpointee->isFunctionType()) 3259 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3260 << lex->getType() << lex->getSourceRange(); 3261 } else { 3262 Diag(Loc, diag::err_typecheck_sub_ptr_object) 3263 << rex->getType() << rex->getSourceRange(); 3264 return QualType(); 3265 } 3266 } 3267 3268 // Pointee types must be compatible. 3269 if (!Context.typesAreCompatible( 3270 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3271 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3272 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3273 << lex->getType() << rex->getType() 3274 << lex->getSourceRange() << rex->getSourceRange(); 3275 return QualType(); 3276 } 3277 3278 return Context.getPointerDiffType(); 3279 } 3280 } 3281 3282 return InvalidOperands(Loc, lex, rex); 3283} 3284 3285// C99 6.5.7 3286QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3287 bool isCompAssign) { 3288 // C99 6.5.7p2: Each of the operands shall have integer type. 3289 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3290 return InvalidOperands(Loc, lex, rex); 3291 3292 // Shifts don't perform usual arithmetic conversions, they just do integer 3293 // promotions on each operand. C99 6.5.7p3 3294 if (!isCompAssign) 3295 UsualUnaryConversions(lex); 3296 UsualUnaryConversions(rex); 3297 3298 // "The type of the result is that of the promoted left operand." 3299 return lex->getType(); 3300} 3301 3302// C99 6.5.8 3303QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3304 bool isRelational) { 3305 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3306 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3307 3308 // C99 6.5.8p3 / C99 6.5.9p4 3309 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3310 UsualArithmeticConversions(lex, rex); 3311 else { 3312 UsualUnaryConversions(lex); 3313 UsualUnaryConversions(rex); 3314 } 3315 QualType lType = lex->getType(); 3316 QualType rType = rex->getType(); 3317 3318 if (!lType->isFloatingType()) { 3319 // For non-floating point types, check for self-comparisons of the form 3320 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3321 // often indicate logic errors in the program. 3322 // NOTE: Don't warn about comparisons of enum constants. These can arise 3323 // from macro expansions, and are usually quite deliberate. 3324 Expr *LHSStripped = lex->IgnoreParens(); 3325 Expr *RHSStripped = rex->IgnoreParens(); 3326 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3327 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3328 if (DRL->getDecl() == DRR->getDecl() && 3329 !isa<EnumConstantDecl>(DRL->getDecl())) 3330 Diag(Loc, diag::warn_selfcomparison); 3331 3332 if (isa<CastExpr>(LHSStripped)) 3333 LHSStripped = LHSStripped->IgnoreParenCasts(); 3334 if (isa<CastExpr>(RHSStripped)) 3335 RHSStripped = RHSStripped->IgnoreParenCasts(); 3336 3337 // Warn about comparisons against a string constant (unless the other 3338 // operand is null), the user probably wants strcmp. 3339 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3340 !RHSStripped->isNullPointerConstant(Context)) 3341 Diag(Loc, diag::warn_stringcompare) << lex->getSourceRange(); 3342 else if ((isa<StringLiteral>(RHSStripped) || 3343 isa<ObjCEncodeExpr>(RHSStripped)) && 3344 !LHSStripped->isNullPointerConstant(Context)) 3345 Diag(Loc, diag::warn_stringcompare) << rex->getSourceRange(); 3346 } 3347 3348 // The result of comparisons is 'bool' in C++, 'int' in C. 3349 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3350 3351 if (isRelational) { 3352 if (lType->isRealType() && rType->isRealType()) 3353 return ResultTy; 3354 } else { 3355 // Check for comparisons of floating point operands using != and ==. 3356 if (lType->isFloatingType()) { 3357 assert(rType->isFloatingType()); 3358 CheckFloatComparison(Loc,lex,rex); 3359 } 3360 3361 if (lType->isArithmeticType() && rType->isArithmeticType()) 3362 return ResultTy; 3363 } 3364 3365 bool LHSIsNull = lex->isNullPointerConstant(Context); 3366 bool RHSIsNull = rex->isNullPointerConstant(Context); 3367 3368 // All of the following pointer related warnings are GCC extensions, except 3369 // when handling null pointer constants. One day, we can consider making them 3370 // errors (when -pedantic-errors is enabled). 3371 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3372 QualType LCanPointeeTy = 3373 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3374 QualType RCanPointeeTy = 3375 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3376 3377 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3378 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3379 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3380 RCanPointeeTy.getUnqualifiedType()) && 3381 !Context.areComparableObjCPointerTypes(lType, rType)) { 3382 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3383 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3384 } 3385 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3386 return ResultTy; 3387 } 3388 // Handle block pointer types. 3389 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 3390 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3391 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3392 3393 if (!LHSIsNull && !RHSIsNull && 3394 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3395 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3396 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3397 } 3398 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3399 return ResultTy; 3400 } 3401 // Allow block pointers to be compared with null pointer constants. 3402 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3403 (lType->isPointerType() && rType->isBlockPointerType())) { 3404 if (!LHSIsNull && !RHSIsNull) { 3405 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3406 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3407 } 3408 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3409 return ResultTy; 3410 } 3411 3412 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3413 if (lType->isPointerType() || rType->isPointerType()) { 3414 const PointerType *LPT = lType->getAsPointerType(); 3415 const PointerType *RPT = rType->getAsPointerType(); 3416 bool LPtrToVoid = LPT ? 3417 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3418 bool RPtrToVoid = RPT ? 3419 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3420 3421 if (!LPtrToVoid && !RPtrToVoid && 3422 !Context.typesAreCompatible(lType, rType)) { 3423 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3424 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3425 ImpCastExprToType(rex, lType); 3426 return ResultTy; 3427 } 3428 ImpCastExprToType(rex, lType); 3429 return ResultTy; 3430 } 3431 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3432 ImpCastExprToType(rex, lType); 3433 return ResultTy; 3434 } else { 3435 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3436 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3437 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3438 ImpCastExprToType(rex, lType); 3439 return ResultTy; 3440 } 3441 } 3442 } 3443 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3444 rType->isIntegerType()) { 3445 if (!RHSIsNull) 3446 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3447 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3448 ImpCastExprToType(rex, lType); // promote the integer to pointer 3449 return ResultTy; 3450 } 3451 if (lType->isIntegerType() && 3452 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3453 if (!LHSIsNull) 3454 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3455 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3456 ImpCastExprToType(lex, rType); // promote the integer to pointer 3457 return ResultTy; 3458 } 3459 // Handle block pointers. 3460 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3461 if (!RHSIsNull) 3462 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3463 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3464 ImpCastExprToType(rex, lType); // promote the integer to pointer 3465 return ResultTy; 3466 } 3467 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3468 if (!LHSIsNull) 3469 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3470 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3471 ImpCastExprToType(lex, rType); // promote the integer to pointer 3472 return ResultTy; 3473 } 3474 return InvalidOperands(Loc, lex, rex); 3475} 3476 3477/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3478/// operates on extended vector types. Instead of producing an IntTy result, 3479/// like a scalar comparison, a vector comparison produces a vector of integer 3480/// types. 3481QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3482 SourceLocation Loc, 3483 bool isRelational) { 3484 // Check to make sure we're operating on vectors of the same type and width, 3485 // Allowing one side to be a scalar of element type. 3486 QualType vType = CheckVectorOperands(Loc, lex, rex); 3487 if (vType.isNull()) 3488 return vType; 3489 3490 QualType lType = lex->getType(); 3491 QualType rType = rex->getType(); 3492 3493 // For non-floating point types, check for self-comparisons of the form 3494 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3495 // often indicate logic errors in the program. 3496 if (!lType->isFloatingType()) { 3497 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3498 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3499 if (DRL->getDecl() == DRR->getDecl()) 3500 Diag(Loc, diag::warn_selfcomparison); 3501 } 3502 3503 // Check for comparisons of floating point operands using != and ==. 3504 if (!isRelational && lType->isFloatingType()) { 3505 assert (rType->isFloatingType()); 3506 CheckFloatComparison(Loc,lex,rex); 3507 } 3508 3509 // Return the type for the comparison, which is the same as vector type for 3510 // integer vectors, or an integer type of identical size and number of 3511 // elements for floating point vectors. 3512 if (lType->isIntegerType()) 3513 return lType; 3514 3515 const VectorType *VTy = lType->getAsVectorType(); 3516 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3517 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3518 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3519 else if (TypeSize == Context.getTypeSize(Context.LongTy)) 3520 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3521 3522 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3523 "Unhandled vector element size in vector compare"); 3524 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3525} 3526 3527inline QualType Sema::CheckBitwiseOperands( 3528 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3529{ 3530 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3531 return CheckVectorOperands(Loc, lex, rex); 3532 3533 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3534 3535 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3536 return compType; 3537 return InvalidOperands(Loc, lex, rex); 3538} 3539 3540inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3541 Expr *&lex, Expr *&rex, SourceLocation Loc) 3542{ 3543 UsualUnaryConversions(lex); 3544 UsualUnaryConversions(rex); 3545 3546 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3547 return Context.IntTy; 3548 return InvalidOperands(Loc, lex, rex); 3549} 3550 3551/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3552/// is a read-only property; return true if so. A readonly property expression 3553/// depends on various declarations and thus must be treated specially. 3554/// 3555static bool IsReadonlyProperty(Expr *E, Sema &S) 3556{ 3557 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3558 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3559 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3560 QualType BaseType = PropExpr->getBase()->getType(); 3561 if (const PointerType *PTy = BaseType->getAsPointerType()) 3562 if (const ObjCInterfaceType *IFTy = 3563 PTy->getPointeeType()->getAsObjCInterfaceType()) 3564 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3565 if (S.isPropertyReadonly(PDecl, IFace)) 3566 return true; 3567 } 3568 } 3569 return false; 3570} 3571 3572/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3573/// emit an error and return true. If so, return false. 3574static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3575 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 3576 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3577 IsLV = Expr::MLV_ReadonlyProperty; 3578 if (IsLV == Expr::MLV_Valid) 3579 return false; 3580 3581 unsigned Diag = 0; 3582 bool NeedType = false; 3583 switch (IsLV) { // C99 6.5.16p2 3584 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3585 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3586 case Expr::MLV_ArrayType: 3587 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3588 NeedType = true; 3589 break; 3590 case Expr::MLV_NotObjectType: 3591 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3592 NeedType = true; 3593 break; 3594 case Expr::MLV_LValueCast: 3595 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3596 break; 3597 case Expr::MLV_InvalidExpression: 3598 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3599 break; 3600 case Expr::MLV_IncompleteType: 3601 case Expr::MLV_IncompleteVoidType: 3602 return S.RequireCompleteType(Loc, E->getType(), 3603 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3604 E->getSourceRange()); 3605 case Expr::MLV_DuplicateVectorComponents: 3606 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 3607 break; 3608 case Expr::MLV_NotBlockQualified: 3609 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 3610 break; 3611 case Expr::MLV_ReadonlyProperty: 3612 Diag = diag::error_readonly_property_assignment; 3613 break; 3614 case Expr::MLV_NoSetterProperty: 3615 Diag = diag::error_nosetter_property_assignment; 3616 break; 3617 } 3618 3619 if (NeedType) 3620 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 3621 else 3622 S.Diag(Loc, Diag) << E->getSourceRange(); 3623 return true; 3624} 3625 3626 3627 3628// C99 6.5.16.1 3629QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 3630 SourceLocation Loc, 3631 QualType CompoundType) { 3632 // Verify that LHS is a modifiable lvalue, and emit error if not. 3633 if (CheckForModifiableLvalue(LHS, Loc, *this)) 3634 return QualType(); 3635 3636 QualType LHSType = LHS->getType(); 3637 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 3638 3639 AssignConvertType ConvTy; 3640 if (CompoundType.isNull()) { 3641 // Simple assignment "x = y". 3642 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 3643 // Special case of NSObject attributes on c-style pointer types. 3644 if (ConvTy == IncompatiblePointer && 3645 ((Context.isObjCNSObjectType(LHSType) && 3646 Context.isObjCObjectPointerType(RHSType)) || 3647 (Context.isObjCNSObjectType(RHSType) && 3648 Context.isObjCObjectPointerType(LHSType)))) 3649 ConvTy = Compatible; 3650 3651 // If the RHS is a unary plus or minus, check to see if they = and + are 3652 // right next to each other. If so, the user may have typo'd "x =+ 4" 3653 // instead of "x += 4". 3654 Expr *RHSCheck = RHS; 3655 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 3656 RHSCheck = ICE->getSubExpr(); 3657 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 3658 if ((UO->getOpcode() == UnaryOperator::Plus || 3659 UO->getOpcode() == UnaryOperator::Minus) && 3660 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 3661 // Only if the two operators are exactly adjacent. 3662 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 3663 // And there is a space or other character before the subexpr of the 3664 // unary +/-. We don't want to warn on "x=-1". 3665 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 3666 UO->getSubExpr()->getLocStart().isFileID()) { 3667 Diag(Loc, diag::warn_not_compound_assign) 3668 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 3669 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 3670 } 3671 } 3672 } else { 3673 // Compound assignment "x += y" 3674 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 3675 } 3676 3677 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 3678 RHS, "assigning")) 3679 return QualType(); 3680 3681 // C99 6.5.16p3: The type of an assignment expression is the type of the 3682 // left operand unless the left operand has qualified type, in which case 3683 // it is the unqualified version of the type of the left operand. 3684 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 3685 // is converted to the type of the assignment expression (above). 3686 // C++ 5.17p1: the type of the assignment expression is that of its left 3687 // oprdu. 3688 return LHSType.getUnqualifiedType(); 3689} 3690 3691// C99 6.5.17 3692QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 3693 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 3694 DefaultFunctionArrayConversion(RHS); 3695 3696 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 3697 // incomplete in C++). 3698 3699 return RHS->getType(); 3700} 3701 3702/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 3703/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 3704QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 3705 bool isInc) { 3706 if (Op->isTypeDependent()) 3707 return Context.DependentTy; 3708 3709 QualType ResType = Op->getType(); 3710 assert(!ResType.isNull() && "no type for increment/decrement expression"); 3711 3712 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 3713 // Decrement of bool is not allowed. 3714 if (!isInc) { 3715 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 3716 return QualType(); 3717 } 3718 // Increment of bool sets it to true, but is deprecated. 3719 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 3720 } else if (ResType->isRealType()) { 3721 // OK! 3722 } else if (const PointerType *PT = ResType->getAsPointerType()) { 3723 // C99 6.5.2.4p2, 6.5.6p2 3724 if (PT->getPointeeType()->isObjectType()) { 3725 // Pointer to object is ok! 3726 } else if (PT->getPointeeType()->isVoidType()) { 3727 if (getLangOptions().CPlusPlus) { 3728 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 3729 << Op->getSourceRange(); 3730 return QualType(); 3731 } 3732 3733 // Pointer to void is a GNU extension in C. 3734 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 3735 } else if (PT->getPointeeType()->isFunctionType()) { 3736 if (getLangOptions().CPlusPlus) { 3737 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 3738 << Op->getType() << Op->getSourceRange(); 3739 return QualType(); 3740 } 3741 3742 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 3743 << ResType << Op->getSourceRange(); 3744 } else { 3745 RequireCompleteType(OpLoc, PT->getPointeeType(), 3746 diag::err_typecheck_arithmetic_incomplete_type, 3747 Op->getSourceRange(), SourceRange(), 3748 ResType); 3749 return QualType(); 3750 } 3751 } else if (ResType->isComplexType()) { 3752 // C99 does not support ++/-- on complex types, we allow as an extension. 3753 Diag(OpLoc, diag::ext_integer_increment_complex) 3754 << ResType << Op->getSourceRange(); 3755 } else { 3756 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 3757 << ResType << Op->getSourceRange(); 3758 return QualType(); 3759 } 3760 // At this point, we know we have a real, complex or pointer type. 3761 // Now make sure the operand is a modifiable lvalue. 3762 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 3763 return QualType(); 3764 return ResType; 3765} 3766 3767/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 3768/// This routine allows us to typecheck complex/recursive expressions 3769/// where the declaration is needed for type checking. We only need to 3770/// handle cases when the expression references a function designator 3771/// or is an lvalue. Here are some examples: 3772/// - &(x) => x 3773/// - &*****f => f for f a function designator. 3774/// - &s.xx => s 3775/// - &s.zz[1].yy -> s, if zz is an array 3776/// - *(x + 1) -> x, if x is an array 3777/// - &"123"[2] -> 0 3778/// - & __real__ x -> x 3779static NamedDecl *getPrimaryDecl(Expr *E) { 3780 switch (E->getStmtClass()) { 3781 case Stmt::DeclRefExprClass: 3782 case Stmt::QualifiedDeclRefExprClass: 3783 return cast<DeclRefExpr>(E)->getDecl(); 3784 case Stmt::MemberExprClass: 3785 // Fields cannot be declared with a 'register' storage class. 3786 // &X->f is always ok, even if X is declared register. 3787 if (cast<MemberExpr>(E)->isArrow()) 3788 return 0; 3789 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 3790 case Stmt::ArraySubscriptExprClass: { 3791 // &X[4] and &4[X] refers to X if X is not a pointer. 3792 3793 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 3794 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 3795 if (!VD || VD->getType()->isPointerType()) 3796 return 0; 3797 else 3798 return VD; 3799 } 3800 case Stmt::UnaryOperatorClass: { 3801 UnaryOperator *UO = cast<UnaryOperator>(E); 3802 3803 switch(UO->getOpcode()) { 3804 case UnaryOperator::Deref: { 3805 // *(X + 1) refers to X if X is not a pointer. 3806 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 3807 ValueDecl *VD = dyn_cast<ValueDecl>(D); 3808 if (!VD || VD->getType()->isPointerType()) 3809 return 0; 3810 return VD; 3811 } 3812 return 0; 3813 } 3814 case UnaryOperator::Real: 3815 case UnaryOperator::Imag: 3816 case UnaryOperator::Extension: 3817 return getPrimaryDecl(UO->getSubExpr()); 3818 default: 3819 return 0; 3820 } 3821 } 3822 case Stmt::BinaryOperatorClass: { 3823 BinaryOperator *BO = cast<BinaryOperator>(E); 3824 3825 // Handle cases involving pointer arithmetic. The result of an 3826 // Assign or AddAssign is not an lvalue so they can be ignored. 3827 3828 // (x + n) or (n + x) => x 3829 if (BO->getOpcode() == BinaryOperator::Add) { 3830 if (BO->getLHS()->getType()->isPointerType()) { 3831 return getPrimaryDecl(BO->getLHS()); 3832 } else if (BO->getRHS()->getType()->isPointerType()) { 3833 return getPrimaryDecl(BO->getRHS()); 3834 } 3835 } 3836 3837 return 0; 3838 } 3839 case Stmt::ParenExprClass: 3840 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 3841 case Stmt::ImplicitCastExprClass: 3842 // &X[4] when X is an array, has an implicit cast from array to pointer. 3843 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 3844 default: 3845 return 0; 3846 } 3847} 3848 3849/// CheckAddressOfOperand - The operand of & must be either a function 3850/// designator or an lvalue designating an object. If it is an lvalue, the 3851/// object cannot be declared with storage class register or be a bit field. 3852/// Note: The usual conversions are *not* applied to the operand of the & 3853/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 3854/// In C++, the operand might be an overloaded function name, in which case 3855/// we allow the '&' but retain the overloaded-function type. 3856QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 3857 if (op->isTypeDependent()) 3858 return Context.DependentTy; 3859 3860 if (getLangOptions().C99) { 3861 // Implement C99-only parts of addressof rules. 3862 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 3863 if (uOp->getOpcode() == UnaryOperator::Deref) 3864 // Per C99 6.5.3.2, the address of a deref always returns a valid result 3865 // (assuming the deref expression is valid). 3866 return uOp->getSubExpr()->getType(); 3867 } 3868 // Technically, there should be a check for array subscript 3869 // expressions here, but the result of one is always an lvalue anyway. 3870 } 3871 NamedDecl *dcl = getPrimaryDecl(op); 3872 Expr::isLvalueResult lval = op->isLvalue(Context); 3873 3874 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 3875 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 3876 // FIXME: emit more specific diag... 3877 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 3878 << op->getSourceRange(); 3879 return QualType(); 3880 } 3881 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 3882 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemExpr->getMemberDecl())) { 3883 if (Field->isBitField()) { 3884 Diag(OpLoc, diag::err_typecheck_address_of) 3885 << "bit-field" << op->getSourceRange(); 3886 return QualType(); 3887 } 3888 } 3889 // Check for Apple extension for accessing vector components. 3890 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 3891 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 3892 Diag(OpLoc, diag::err_typecheck_address_of) 3893 << "vector element" << op->getSourceRange(); 3894 return QualType(); 3895 } else if (dcl) { // C99 6.5.3.2p1 3896 // We have an lvalue with a decl. Make sure the decl is not declared 3897 // with the register storage-class specifier. 3898 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 3899 if (vd->getStorageClass() == VarDecl::Register) { 3900 Diag(OpLoc, diag::err_typecheck_address_of) 3901 << "register variable" << op->getSourceRange(); 3902 return QualType(); 3903 } 3904 } else if (isa<OverloadedFunctionDecl>(dcl)) { 3905 return Context.OverloadTy; 3906 } else if (isa<FieldDecl>(dcl)) { 3907 // Okay: we can take the address of a field. 3908 // Could be a pointer to member, though, if there is an explicit 3909 // scope qualifier for the class. 3910 if (isa<QualifiedDeclRefExpr>(op)) { 3911 DeclContext *Ctx = dcl->getDeclContext(); 3912 if (Ctx && Ctx->isRecord()) 3913 return Context.getMemberPointerType(op->getType(), 3914 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3915 } 3916 } else if (isa<FunctionDecl>(dcl)) { 3917 // Okay: we can take the address of a function. 3918 // As above. 3919 if (isa<QualifiedDeclRefExpr>(op)) { 3920 DeclContext *Ctx = dcl->getDeclContext(); 3921 if (Ctx && Ctx->isRecord()) 3922 return Context.getMemberPointerType(op->getType(), 3923 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3924 } 3925 } 3926 else 3927 assert(0 && "Unknown/unexpected decl type"); 3928 } 3929 3930 // If the operand has type "type", the result has type "pointer to type". 3931 return Context.getPointerType(op->getType()); 3932} 3933 3934QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 3935 if (Op->isTypeDependent()) 3936 return Context.DependentTy; 3937 3938 UsualUnaryConversions(Op); 3939 QualType Ty = Op->getType(); 3940 3941 // Note that per both C89 and C99, this is always legal, even if ptype is an 3942 // incomplete type or void. It would be possible to warn about dereferencing 3943 // a void pointer, but it's completely well-defined, and such a warning is 3944 // unlikely to catch any mistakes. 3945 if (const PointerType *PT = Ty->getAsPointerType()) 3946 return PT->getPointeeType(); 3947 3948 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 3949 << Ty << Op->getSourceRange(); 3950 return QualType(); 3951} 3952 3953static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 3954 tok::TokenKind Kind) { 3955 BinaryOperator::Opcode Opc; 3956 switch (Kind) { 3957 default: assert(0 && "Unknown binop!"); 3958 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 3959 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 3960 case tok::star: Opc = BinaryOperator::Mul; break; 3961 case tok::slash: Opc = BinaryOperator::Div; break; 3962 case tok::percent: Opc = BinaryOperator::Rem; break; 3963 case tok::plus: Opc = BinaryOperator::Add; break; 3964 case tok::minus: Opc = BinaryOperator::Sub; break; 3965 case tok::lessless: Opc = BinaryOperator::Shl; break; 3966 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 3967 case tok::lessequal: Opc = BinaryOperator::LE; break; 3968 case tok::less: Opc = BinaryOperator::LT; break; 3969 case tok::greaterequal: Opc = BinaryOperator::GE; break; 3970 case tok::greater: Opc = BinaryOperator::GT; break; 3971 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 3972 case tok::equalequal: Opc = BinaryOperator::EQ; break; 3973 case tok::amp: Opc = BinaryOperator::And; break; 3974 case tok::caret: Opc = BinaryOperator::Xor; break; 3975 case tok::pipe: Opc = BinaryOperator::Or; break; 3976 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 3977 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 3978 case tok::equal: Opc = BinaryOperator::Assign; break; 3979 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 3980 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 3981 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 3982 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 3983 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 3984 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 3985 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 3986 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 3987 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 3988 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 3989 case tok::comma: Opc = BinaryOperator::Comma; break; 3990 } 3991 return Opc; 3992} 3993 3994static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 3995 tok::TokenKind Kind) { 3996 UnaryOperator::Opcode Opc; 3997 switch (Kind) { 3998 default: assert(0 && "Unknown unary op!"); 3999 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4000 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4001 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4002 case tok::star: Opc = UnaryOperator::Deref; break; 4003 case tok::plus: Opc = UnaryOperator::Plus; break; 4004 case tok::minus: Opc = UnaryOperator::Minus; break; 4005 case tok::tilde: Opc = UnaryOperator::Not; break; 4006 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4007 case tok::kw___real: Opc = UnaryOperator::Real; break; 4008 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4009 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4010 } 4011 return Opc; 4012} 4013 4014/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4015/// operator @p Opc at location @c TokLoc. This routine only supports 4016/// built-in operations; ActOnBinOp handles overloaded operators. 4017Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4018 unsigned Op, 4019 Expr *lhs, Expr *rhs) { 4020 QualType ResultTy; // Result type of the binary operator. 4021 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 4022 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4023 4024 switch (Opc) { 4025 case BinaryOperator::Assign: 4026 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4027 break; 4028 case BinaryOperator::PtrMemD: 4029 case BinaryOperator::PtrMemI: 4030 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4031 Opc == BinaryOperator::PtrMemI); 4032 break; 4033 case BinaryOperator::Mul: 4034 case BinaryOperator::Div: 4035 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4036 break; 4037 case BinaryOperator::Rem: 4038 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4039 break; 4040 case BinaryOperator::Add: 4041 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4042 break; 4043 case BinaryOperator::Sub: 4044 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4045 break; 4046 case BinaryOperator::Shl: 4047 case BinaryOperator::Shr: 4048 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4049 break; 4050 case BinaryOperator::LE: 4051 case BinaryOperator::LT: 4052 case BinaryOperator::GE: 4053 case BinaryOperator::GT: 4054 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 4055 break; 4056 case BinaryOperator::EQ: 4057 case BinaryOperator::NE: 4058 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 4059 break; 4060 case BinaryOperator::And: 4061 case BinaryOperator::Xor: 4062 case BinaryOperator::Or: 4063 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4064 break; 4065 case BinaryOperator::LAnd: 4066 case BinaryOperator::LOr: 4067 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4068 break; 4069 case BinaryOperator::MulAssign: 4070 case BinaryOperator::DivAssign: 4071 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4072 if (!CompTy.isNull()) 4073 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4074 break; 4075 case BinaryOperator::RemAssign: 4076 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4077 if (!CompTy.isNull()) 4078 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4079 break; 4080 case BinaryOperator::AddAssign: 4081 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 4082 if (!CompTy.isNull()) 4083 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4084 break; 4085 case BinaryOperator::SubAssign: 4086 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 4087 if (!CompTy.isNull()) 4088 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4089 break; 4090 case BinaryOperator::ShlAssign: 4091 case BinaryOperator::ShrAssign: 4092 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4093 if (!CompTy.isNull()) 4094 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4095 break; 4096 case BinaryOperator::AndAssign: 4097 case BinaryOperator::XorAssign: 4098 case BinaryOperator::OrAssign: 4099 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4100 if (!CompTy.isNull()) 4101 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4102 break; 4103 case BinaryOperator::Comma: 4104 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4105 break; 4106 } 4107 if (ResultTy.isNull()) 4108 return ExprError(); 4109 if (CompTy.isNull()) 4110 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4111 else 4112 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4113 CompTy, OpLoc)); 4114} 4115 4116// Binary Operators. 'Tok' is the token for the operator. 4117Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4118 tok::TokenKind Kind, 4119 ExprArg LHS, ExprArg RHS) { 4120 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4121 Expr *lhs = (Expr *)LHS.release(), *rhs = (Expr*)RHS.release(); 4122 4123 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4124 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4125 4126 if (getLangOptions().CPlusPlus && 4127 (lhs->getType()->isOverloadableType() || 4128 rhs->getType()->isOverloadableType())) { 4129 // Find all of the overloaded operators visible from this 4130 // point. We perform both an operator-name lookup from the local 4131 // scope and an argument-dependent lookup based on the types of 4132 // the arguments. 4133 FunctionSet Functions; 4134 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4135 if (OverOp != OO_None) { 4136 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4137 Functions); 4138 Expr *Args[2] = { lhs, rhs }; 4139 DeclarationName OpName 4140 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4141 ArgumentDependentLookup(OpName, Args, 2, Functions); 4142 } 4143 4144 // Build the (potentially-overloaded, potentially-dependent) 4145 // binary operation. 4146 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4147 } 4148 4149 // Build a built-in binary operation. 4150 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4151} 4152 4153Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4154 unsigned OpcIn, 4155 ExprArg InputArg) { 4156 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4157 4158 // FIXME: Input is modified below, but InputArg is not updated 4159 // appropriately. 4160 Expr *Input = (Expr *)InputArg.get(); 4161 QualType resultType; 4162 switch (Opc) { 4163 case UnaryOperator::PostInc: 4164 case UnaryOperator::PostDec: 4165 case UnaryOperator::OffsetOf: 4166 assert(false && "Invalid unary operator"); 4167 break; 4168 4169 case UnaryOperator::PreInc: 4170 case UnaryOperator::PreDec: 4171 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4172 Opc == UnaryOperator::PreInc); 4173 break; 4174 case UnaryOperator::AddrOf: 4175 resultType = CheckAddressOfOperand(Input, OpLoc); 4176 break; 4177 case UnaryOperator::Deref: 4178 DefaultFunctionArrayConversion(Input); 4179 resultType = CheckIndirectionOperand(Input, OpLoc); 4180 break; 4181 case UnaryOperator::Plus: 4182 case UnaryOperator::Minus: 4183 UsualUnaryConversions(Input); 4184 resultType = Input->getType(); 4185 if (resultType->isDependentType()) 4186 break; 4187 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4188 break; 4189 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4190 resultType->isEnumeralType()) 4191 break; 4192 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4193 Opc == UnaryOperator::Plus && 4194 resultType->isPointerType()) 4195 break; 4196 4197 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4198 << resultType << Input->getSourceRange()); 4199 case UnaryOperator::Not: // bitwise complement 4200 UsualUnaryConversions(Input); 4201 resultType = Input->getType(); 4202 if (resultType->isDependentType()) 4203 break; 4204 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4205 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4206 // C99 does not support '~' for complex conjugation. 4207 Diag(OpLoc, diag::ext_integer_complement_complex) 4208 << resultType << Input->getSourceRange(); 4209 else if (!resultType->isIntegerType()) 4210 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4211 << resultType << Input->getSourceRange()); 4212 break; 4213 case UnaryOperator::LNot: // logical negation 4214 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4215 DefaultFunctionArrayConversion(Input); 4216 resultType = Input->getType(); 4217 if (resultType->isDependentType()) 4218 break; 4219 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4220 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4221 << resultType << Input->getSourceRange()); 4222 // LNot always has type int. C99 6.5.3.3p5. 4223 // In C++, it's bool. C++ 5.3.1p8 4224 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4225 break; 4226 case UnaryOperator::Real: 4227 case UnaryOperator::Imag: 4228 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4229 break; 4230 case UnaryOperator::Extension: 4231 resultType = Input->getType(); 4232 break; 4233 } 4234 if (resultType.isNull()) 4235 return ExprError(); 4236 4237 InputArg.release(); 4238 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4239} 4240 4241// Unary Operators. 'Tok' is the token for the operator. 4242Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4243 tok::TokenKind Op, ExprArg input) { 4244 Expr *Input = (Expr*)input.get(); 4245 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4246 4247 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4248 // Find all of the overloaded operators visible from this 4249 // point. We perform both an operator-name lookup from the local 4250 // scope and an argument-dependent lookup based on the types of 4251 // the arguments. 4252 FunctionSet Functions; 4253 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4254 if (OverOp != OO_None) { 4255 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4256 Functions); 4257 DeclarationName OpName 4258 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4259 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4260 } 4261 4262 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4263 } 4264 4265 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4266} 4267 4268/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4269Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4270 SourceLocation LabLoc, 4271 IdentifierInfo *LabelII) { 4272 // Look up the record for this label identifier. 4273 LabelStmt *&LabelDecl = CurBlock ? CurBlock->LabelMap[LabelII] : 4274 LabelMap[LabelII]; 4275 4276 // If we haven't seen this label yet, create a forward reference. It 4277 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4278 if (LabelDecl == 0) 4279 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4280 4281 // Create the AST node. The address of a label always has type 'void*'. 4282 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4283 Context.getPointerType(Context.VoidTy))); 4284} 4285 4286Sema::OwningExprResult 4287Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4288 SourceLocation RPLoc) { // "({..})" 4289 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4290 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4291 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4292 4293 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4294 if (isFileScope) { 4295 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4296 } 4297 4298 // FIXME: there are a variety of strange constraints to enforce here, for 4299 // example, it is not possible to goto into a stmt expression apparently. 4300 // More semantic analysis is needed. 4301 4302 // FIXME: the last statement in the compount stmt has its value used. We 4303 // should not warn about it being unused. 4304 4305 // If there are sub stmts in the compound stmt, take the type of the last one 4306 // as the type of the stmtexpr. 4307 QualType Ty = Context.VoidTy; 4308 4309 if (!Compound->body_empty()) { 4310 Stmt *LastStmt = Compound->body_back(); 4311 // If LastStmt is a label, skip down through into the body. 4312 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4313 LastStmt = Label->getSubStmt(); 4314 4315 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4316 Ty = LastExpr->getType(); 4317 } 4318 4319 // FIXME: Check that expression type is complete/non-abstract; statement 4320 // expressions are not lvalues. 4321 4322 substmt.release(); 4323 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4324} 4325 4326Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4327 SourceLocation BuiltinLoc, 4328 SourceLocation TypeLoc, 4329 TypeTy *argty, 4330 OffsetOfComponent *CompPtr, 4331 unsigned NumComponents, 4332 SourceLocation RPLoc) { 4333 // FIXME: This function leaks all expressions in the offset components on 4334 // error. 4335 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4336 assert(!ArgTy.isNull() && "Missing type argument!"); 4337 4338 bool Dependent = ArgTy->isDependentType(); 4339 4340 // We must have at least one component that refers to the type, and the first 4341 // one is known to be a field designator. Verify that the ArgTy represents 4342 // a struct/union/class. 4343 if (!Dependent && !ArgTy->isRecordType()) 4344 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4345 4346 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 4347 // with an incomplete type would be illegal. 4348 4349 // Otherwise, create a null pointer as the base, and iteratively process 4350 // the offsetof designators. 4351 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4352 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4353 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4354 ArgTy, SourceLocation()); 4355 4356 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4357 // GCC extension, diagnose them. 4358 // FIXME: This diagnostic isn't actually visible because the location is in 4359 // a system header! 4360 if (NumComponents != 1) 4361 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4362 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4363 4364 if (!Dependent) { 4365 // FIXME: Dependent case loses a lot of information here. And probably 4366 // leaks like a sieve. 4367 for (unsigned i = 0; i != NumComponents; ++i) { 4368 const OffsetOfComponent &OC = CompPtr[i]; 4369 if (OC.isBrackets) { 4370 // Offset of an array sub-field. TODO: Should we allow vector elements? 4371 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4372 if (!AT) { 4373 Res->Destroy(Context); 4374 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 4375 << Res->getType()); 4376 } 4377 4378 // FIXME: C++: Verify that operator[] isn't overloaded. 4379 4380 // Promote the array so it looks more like a normal array subscript 4381 // expression. 4382 DefaultFunctionArrayConversion(Res); 4383 4384 // C99 6.5.2.1p1 4385 Expr *Idx = static_cast<Expr*>(OC.U.E); 4386 // FIXME: Leaks Res 4387 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4388 return ExprError(Diag(Idx->getLocStart(), 4389 diag::err_typecheck_subscript) 4390 << Idx->getSourceRange()); 4391 4392 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4393 OC.LocEnd); 4394 continue; 4395 } 4396 4397 const RecordType *RC = Res->getType()->getAsRecordType(); 4398 if (!RC) { 4399 Res->Destroy(Context); 4400 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 4401 << Res->getType()); 4402 } 4403 4404 // Get the decl corresponding to this. 4405 RecordDecl *RD = RC->getDecl(); 4406 FieldDecl *MemberDecl 4407 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4408 LookupMemberName) 4409 .getAsDecl()); 4410 // FIXME: Leaks Res 4411 if (!MemberDecl) 4412 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 4413 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 4414 4415 // FIXME: C++: Verify that MemberDecl isn't a static field. 4416 // FIXME: Verify that MemberDecl isn't a bitfield. 4417 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 4418 // matter here. 4419 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4420 MemberDecl->getType().getNonReferenceType()); 4421 } 4422 } 4423 4424 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4425 Context.getSizeType(), BuiltinLoc)); 4426} 4427 4428 4429Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4430 TypeTy *arg1,TypeTy *arg2, 4431 SourceLocation RPLoc) { 4432 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4433 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4434 4435 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4436 4437 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 4438 argT1, argT2, RPLoc)); 4439} 4440 4441Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 4442 ExprArg cond, 4443 ExprArg expr1, ExprArg expr2, 4444 SourceLocation RPLoc) { 4445 Expr *CondExpr = static_cast<Expr*>(cond.get()); 4446 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 4447 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 4448 4449 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4450 4451 QualType resType; 4452 if (CondExpr->isValueDependent()) { 4453 resType = Context.DependentTy; 4454 } else { 4455 // The conditional expression is required to be a constant expression. 4456 llvm::APSInt condEval(32); 4457 SourceLocation ExpLoc; 4458 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4459 return ExprError(Diag(ExpLoc, 4460 diag::err_typecheck_choose_expr_requires_constant) 4461 << CondExpr->getSourceRange()); 4462 4463 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4464 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 4465 } 4466 4467 cond.release(); expr1.release(); expr2.release(); 4468 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4469 resType, RPLoc)); 4470} 4471 4472//===----------------------------------------------------------------------===// 4473// Clang Extensions. 4474//===----------------------------------------------------------------------===// 4475 4476/// ActOnBlockStart - This callback is invoked when a block literal is started. 4477void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4478 // Analyze block parameters. 4479 BlockSemaInfo *BSI = new BlockSemaInfo(); 4480 4481 // Add BSI to CurBlock. 4482 BSI->PrevBlockInfo = CurBlock; 4483 CurBlock = BSI; 4484 4485 BSI->ReturnType = 0; 4486 BSI->TheScope = BlockScope; 4487 BSI->hasBlockDeclRefExprs = false; 4488 4489 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4490 PushDeclContext(BlockScope, BSI->TheDecl); 4491} 4492 4493void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4494 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4495 4496 if (ParamInfo.getNumTypeObjects() == 0 4497 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4498 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4499 4500 // The type is entirely optional as well, if none, use DependentTy. 4501 if (T.isNull()) 4502 T = Context.DependentTy; 4503 4504 // The parameter list is optional, if there was none, assume (). 4505 if (!T->isFunctionType()) 4506 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4507 4508 CurBlock->hasPrototype = true; 4509 CurBlock->isVariadic = false; 4510 Type *RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4511 .getTypePtr(); 4512 4513 if (!RetTy->isDependentType()) 4514 CurBlock->ReturnType = RetTy; 4515 return; 4516 } 4517 4518 // Analyze arguments to block. 4519 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4520 "Not a function declarator!"); 4521 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4522 4523 CurBlock->hasPrototype = FTI.hasPrototype; 4524 CurBlock->isVariadic = true; 4525 4526 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4527 // no arguments, not a function that takes a single void argument. 4528 if (FTI.hasPrototype && 4529 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4530 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 4531 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 4532 // empty arg list, don't push any params. 4533 CurBlock->isVariadic = false; 4534 } else if (FTI.hasPrototype) { 4535 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4536 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 4537 CurBlock->isVariadic = FTI.isVariadic; 4538 QualType T = GetTypeForDeclarator (ParamInfo, CurScope); 4539 4540 Type* RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4541 .getTypePtr(); 4542 4543 if (!RetTy->isDependentType()) 4544 CurBlock->ReturnType = RetTy; 4545 } 4546 CurBlock->TheDecl->setParams(Context, &CurBlock->Params[0], 4547 CurBlock->Params.size()); 4548 4549 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4550 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4551 // If this has an identifier, add it to the scope stack. 4552 if ((*AI)->getIdentifier()) 4553 PushOnScopeChains(*AI, CurBlock->TheScope); 4554} 4555 4556/// ActOnBlockError - If there is an error parsing a block, this callback 4557/// is invoked to pop the information about the block from the action impl. 4558void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4559 // Ensure that CurBlock is deleted. 4560 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4561 4562 // Pop off CurBlock, handle nested blocks. 4563 CurBlock = CurBlock->PrevBlockInfo; 4564 4565 // FIXME: Delete the ParmVarDecl objects as well??? 4566 4567} 4568 4569/// ActOnBlockStmtExpr - This is called when the body of a block statement 4570/// literal was successfully completed. ^(int x){...} 4571Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 4572 StmtArg body, Scope *CurScope) { 4573 // Ensure that CurBlock is deleted. 4574 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4575 4576 PopDeclContext(); 4577 4578 // Pop off CurBlock, handle nested blocks. 4579 CurBlock = CurBlock->PrevBlockInfo; 4580 4581 QualType RetTy = Context.VoidTy; 4582 if (BSI->ReturnType) 4583 RetTy = QualType(BSI->ReturnType, 0); 4584 4585 llvm::SmallVector<QualType, 8> ArgTypes; 4586 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4587 ArgTypes.push_back(BSI->Params[i]->getType()); 4588 4589 QualType BlockTy; 4590 if (!BSI->hasPrototype) 4591 BlockTy = Context.getFunctionNoProtoType(RetTy); 4592 else 4593 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 4594 BSI->isVariadic, 0); 4595 4596 // FIXME: Check that return/parameter types are complete/non-abstract 4597 4598 BlockTy = Context.getBlockPointerType(BlockTy); 4599 4600 BSI->TheDecl->setBody(static_cast<CompoundStmt*>(body.release())); 4601 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 4602 BSI->hasBlockDeclRefExprs)); 4603} 4604 4605Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 4606 ExprArg expr, TypeTy *type, 4607 SourceLocation RPLoc) { 4608 QualType T = QualType::getFromOpaquePtr(type); 4609 4610 InitBuiltinVaListType(); 4611 4612 // Get the va_list type 4613 QualType VaListType = Context.getBuiltinVaListType(); 4614 // Deal with implicit array decay; for example, on x86-64, 4615 // va_list is an array, but it's supposed to decay to 4616 // a pointer for va_arg. 4617 if (VaListType->isArrayType()) 4618 VaListType = Context.getArrayDecayedType(VaListType); 4619 // Make sure the input expression also decays appropriately. 4620 Expr *E = static_cast<Expr*>(expr.get()); 4621 UsualUnaryConversions(E); 4622 4623 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 4624 return ExprError(Diag(E->getLocStart(), 4625 diag::err_first_argument_to_va_arg_not_of_type_va_list) 4626 << E->getType() << E->getSourceRange()); 4627 4628 // FIXME: Check that type is complete/non-abstract 4629 // FIXME: Warn if a non-POD type is passed in. 4630 4631 expr.release(); 4632 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 4633 RPLoc)); 4634} 4635 4636Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 4637 // The type of __null will be int or long, depending on the size of 4638 // pointers on the target. 4639 QualType Ty; 4640 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 4641 Ty = Context.IntTy; 4642 else 4643 Ty = Context.LongTy; 4644 4645 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 4646} 4647 4648bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 4649 SourceLocation Loc, 4650 QualType DstType, QualType SrcType, 4651 Expr *SrcExpr, const char *Flavor) { 4652 // Decode the result (notice that AST's are still created for extensions). 4653 bool isInvalid = false; 4654 unsigned DiagKind; 4655 switch (ConvTy) { 4656 default: assert(0 && "Unknown conversion type"); 4657 case Compatible: return false; 4658 case PointerToInt: 4659 DiagKind = diag::ext_typecheck_convert_pointer_int; 4660 break; 4661 case IntToPointer: 4662 DiagKind = diag::ext_typecheck_convert_int_pointer; 4663 break; 4664 case IncompatiblePointer: 4665 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 4666 break; 4667 case IncompatiblePointerSign: 4668 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 4669 break; 4670 case FunctionVoidPointer: 4671 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 4672 break; 4673 case CompatiblePointerDiscardsQualifiers: 4674 // If the qualifiers lost were because we were applying the 4675 // (deprecated) C++ conversion from a string literal to a char* 4676 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 4677 // Ideally, this check would be performed in 4678 // CheckPointerTypesForAssignment. However, that would require a 4679 // bit of refactoring (so that the second argument is an 4680 // expression, rather than a type), which should be done as part 4681 // of a larger effort to fix CheckPointerTypesForAssignment for 4682 // C++ semantics. 4683 if (getLangOptions().CPlusPlus && 4684 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 4685 return false; 4686 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 4687 break; 4688 case IntToBlockPointer: 4689 DiagKind = diag::err_int_to_block_pointer; 4690 break; 4691 case IncompatibleBlockPointer: 4692 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 4693 break; 4694 case IncompatibleObjCQualifiedId: 4695 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 4696 // it can give a more specific diagnostic. 4697 DiagKind = diag::warn_incompatible_qualified_id; 4698 break; 4699 case IncompatibleVectors: 4700 DiagKind = diag::warn_incompatible_vectors; 4701 break; 4702 case Incompatible: 4703 DiagKind = diag::err_typecheck_convert_incompatible; 4704 isInvalid = true; 4705 break; 4706 } 4707 4708 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 4709 << SrcExpr->getSourceRange(); 4710 return isInvalid; 4711} 4712 4713bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 4714{ 4715 Expr::EvalResult EvalResult; 4716 4717 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 4718 EvalResult.HasSideEffects) { 4719 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 4720 4721 if (EvalResult.Diag) { 4722 // We only show the note if it's not the usual "invalid subexpression" 4723 // or if it's actually in a subexpression. 4724 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 4725 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 4726 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4727 } 4728 4729 return true; 4730 } 4731 4732 if (EvalResult.Diag) { 4733 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 4734 E->getSourceRange(); 4735 4736 // Print the reason it's not a constant. 4737 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4738 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4739 } 4740 4741 if (Result) 4742 *Result = EvalResult.Val.getInt(); 4743 return false; 4744} 4745