SemaExpr.cpp revision f96065763cd39674635dc75b2441e5391ded8f94
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 return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 444 ValueDependent, 445 SS->getRange().getBegin()); 446 else 447 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 448} 449 450/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 451/// variable corresponding to the anonymous union or struct whose type 452/// is Record. 453static Decl *getObjectForAnonymousRecordDecl(RecordDecl *Record) { 454 assert(Record->isAnonymousStructOrUnion() && 455 "Record must be an anonymous struct or union!"); 456 457 // FIXME: Once Decls are directly linked together, this will 458 // be an O(1) operation rather than a slow walk through DeclContext's 459 // vector (which itself will be eliminated). DeclGroups might make 460 // this even better. 461 DeclContext *Ctx = Record->getDeclContext(); 462 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 463 DEnd = Ctx->decls_end(); 464 D != DEnd; ++D) { 465 if (*D == Record) { 466 // The object for the anonymous struct/union directly 467 // follows its type in the list of declarations. 468 ++D; 469 assert(D != DEnd && "Missing object for anonymous record"); 470 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 471 return *D; 472 } 473 } 474 475 assert(false && "Missing object for anonymous record"); 476 return 0; 477} 478 479Sema::OwningExprResult 480Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 481 FieldDecl *Field, 482 Expr *BaseObjectExpr, 483 SourceLocation OpLoc) { 484 assert(Field->getDeclContext()->isRecord() && 485 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 486 && "Field must be stored inside an anonymous struct or union"); 487 488 // Construct the sequence of field member references 489 // we'll have to perform to get to the field in the anonymous 490 // union/struct. The list of members is built from the field 491 // outward, so traverse it backwards to go from an object in 492 // the current context to the field we found. 493 llvm::SmallVector<FieldDecl *, 4> AnonFields; 494 AnonFields.push_back(Field); 495 VarDecl *BaseObject = 0; 496 DeclContext *Ctx = Field->getDeclContext(); 497 do { 498 RecordDecl *Record = cast<RecordDecl>(Ctx); 499 Decl *AnonObject = getObjectForAnonymousRecordDecl(Record); 500 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 501 AnonFields.push_back(AnonField); 502 else { 503 BaseObject = cast<VarDecl>(AnonObject); 504 break; 505 } 506 Ctx = Ctx->getParent(); 507 } while (Ctx->isRecord() && 508 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 509 510 // Build the expression that refers to the base object, from 511 // which we will build a sequence of member references to each 512 // of the anonymous union objects and, eventually, the field we 513 // found via name lookup. 514 bool BaseObjectIsPointer = false; 515 unsigned ExtraQuals = 0; 516 if (BaseObject) { 517 // BaseObject is an anonymous struct/union variable (and is, 518 // therefore, not part of another non-anonymous record). 519 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 520 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 521 SourceLocation()); 522 ExtraQuals 523 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 524 } else if (BaseObjectExpr) { 525 // The caller provided the base object expression. Determine 526 // whether its a pointer and whether it adds any qualifiers to the 527 // anonymous struct/union fields we're looking into. 528 QualType ObjectType = BaseObjectExpr->getType(); 529 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 530 BaseObjectIsPointer = true; 531 ObjectType = ObjectPtr->getPointeeType(); 532 } 533 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 534 } else { 535 // We've found a member of an anonymous struct/union that is 536 // inside a non-anonymous struct/union, so in a well-formed 537 // program our base object expression is "this". 538 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 539 if (!MD->isStatic()) { 540 QualType AnonFieldType 541 = Context.getTagDeclType( 542 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 543 QualType ThisType = Context.getTagDeclType(MD->getParent()); 544 if ((Context.getCanonicalType(AnonFieldType) 545 == Context.getCanonicalType(ThisType)) || 546 IsDerivedFrom(ThisType, AnonFieldType)) { 547 // Our base object expression is "this". 548 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 549 MD->getThisType(Context)); 550 BaseObjectIsPointer = true; 551 } 552 } else { 553 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 554 << Field->getDeclName()); 555 } 556 ExtraQuals = MD->getTypeQualifiers(); 557 } 558 559 if (!BaseObjectExpr) 560 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 561 << Field->getDeclName()); 562 } 563 564 // Build the implicit member references to the field of the 565 // anonymous struct/union. 566 Expr *Result = BaseObjectExpr; 567 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 568 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 569 FI != FIEnd; ++FI) { 570 QualType MemberType = (*FI)->getType(); 571 if (!(*FI)->isMutable()) { 572 unsigned combinedQualifiers 573 = MemberType.getCVRQualifiers() | ExtraQuals; 574 MemberType = MemberType.getQualifiedType(combinedQualifiers); 575 } 576 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 577 OpLoc, MemberType); 578 BaseObjectIsPointer = false; 579 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 580 } 581 582 return Owned(Result); 583} 584 585/// ActOnDeclarationNameExpr - The parser has read some kind of name 586/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 587/// performs lookup on that name and returns an expression that refers 588/// to that name. This routine isn't directly called from the parser, 589/// because the parser doesn't know about DeclarationName. Rather, 590/// this routine is called by ActOnIdentifierExpr, 591/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 592/// which form the DeclarationName from the corresponding syntactic 593/// forms. 594/// 595/// HasTrailingLParen indicates whether this identifier is used in a 596/// function call context. LookupCtx is only used for a C++ 597/// qualified-id (foo::bar) to indicate the class or namespace that 598/// the identifier must be a member of. 599/// 600/// isAddressOfOperand means that this expression is the direct operand 601/// of an address-of operator. This matters because this is the only 602/// situation where a qualified name referencing a non-static member may 603/// appear outside a member function of this class. 604Sema::OwningExprResult 605Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 606 DeclarationName Name, bool HasTrailingLParen, 607 const CXXScopeSpec *SS, 608 bool isAddressOfOperand) { 609 // Could be enum-constant, value decl, instance variable, etc. 610 if (SS && SS->isInvalid()) 611 return ExprError(); 612 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 613 false, true, Loc); 614 615 NamedDecl *D = 0; 616 if (Lookup.isAmbiguous()) { 617 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 618 SS && SS->isSet() ? SS->getRange() 619 : SourceRange()); 620 return ExprError(); 621 } else 622 D = Lookup.getAsDecl(); 623 624 // If this reference is in an Objective-C method, then ivar lookup happens as 625 // well. 626 IdentifierInfo *II = Name.getAsIdentifierInfo(); 627 if (II && getCurMethodDecl()) { 628 // There are two cases to handle here. 1) scoped lookup could have failed, 629 // in which case we should look for an ivar. 2) scoped lookup could have 630 // found a decl, but that decl is outside the current instance method (i.e. 631 // a global variable). In these two cases, we do a lookup for an ivar with 632 // this name, if the lookup sucedes, we replace it our current decl. 633 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 634 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 635 ObjCInterfaceDecl *ClassDeclared; 636 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 637 // Check if referencing a field with __attribute__((deprecated)). 638 if (DiagnoseUseOfDecl(IV, Loc)) 639 return ExprError(); 640 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 641 // If a class method attemps to use a free standing ivar, this is 642 // an error. 643 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 644 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 645 << IV->getDeclName()); 646 // If a class method uses a global variable, even if an ivar with 647 // same name exists, use the global. 648 if (!IsClsMethod) { 649 if (IV->getAccessControl() == ObjCIvarDecl::Private && 650 ClassDeclared != IFace) 651 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 652 // FIXME: This should use a new expr for a direct reference, don't turn 653 // this into Self->ivar, just return a BareIVarExpr or something. 654 IdentifierInfo &II = Context.Idents.get("self"); 655 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 656 ObjCIvarRefExpr *MRef = new (Context) ObjCIvarRefExpr(IV, IV->getType(), 657 Loc, static_cast<Expr*>(SelfExpr.release()), 658 true, true); 659 Context.setFieldDecl(IFace, IV, MRef); 660 return Owned(MRef); 661 } 662 } 663 } 664 else if (getCurMethodDecl()->isInstanceMethod()) { 665 // We should warn if a local variable hides an ivar. 666 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 667 ObjCInterfaceDecl *ClassDeclared; 668 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 669 if (IV->getAccessControl() != ObjCIvarDecl::Private || 670 IFace == ClassDeclared) 671 Diag(Loc, diag::warn_ivar_use_hidden)<<IV->getDeclName(); 672 } 673 } 674 // Needed to implement property "super.method" notation. 675 if (D == 0 && II->isStr("super")) { 676 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 677 getCurMethodDecl()->getClassInterface())); 678 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 679 } 680 } 681 682 // Determine whether this name might be a candidate for 683 // argument-dependent lookup. 684 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 685 HasTrailingLParen; 686 687 if (ADL && D == 0) { 688 // We've seen something of the form 689 // 690 // identifier( 691 // 692 // and we did not find any entity by the name 693 // "identifier". However, this identifier is still subject to 694 // argument-dependent lookup, so keep track of the name. 695 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 696 Context.OverloadTy, 697 Loc)); 698 } 699 700 if (D == 0) { 701 // Otherwise, this could be an implicitly declared function reference (legal 702 // in C90, extension in C99). 703 if (HasTrailingLParen && II && 704 !getLangOptions().CPlusPlus) // Not in C++. 705 D = ImplicitlyDefineFunction(Loc, *II, S); 706 else { 707 // If this name wasn't predeclared and if this is not a function call, 708 // diagnose the problem. 709 if (SS && !SS->isEmpty()) 710 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 711 << Name << SS->getRange()); 712 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 713 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 714 return ExprError(Diag(Loc, diag::err_undeclared_use) 715 << Name.getAsString()); 716 else 717 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 718 } 719 } 720 721 // If this is an expression of the form &Class::member, don't build an 722 // implicit member ref, because we want a pointer to the member in general, 723 // not any specific instance's member. 724 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 725 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 726 if (D && isa<CXXRecordDecl>(DC)) { 727 QualType DType; 728 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 729 DType = FD->getType().getNonReferenceType(); 730 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 731 DType = Method->getType(); 732 } else if (isa<OverloadedFunctionDecl>(D)) { 733 DType = Context.OverloadTy; 734 } 735 // Could be an inner type. That's diagnosed below, so ignore it here. 736 if (!DType.isNull()) { 737 // The pointer is type- and value-dependent if it points into something 738 // dependent. 739 bool Dependent = false; 740 for (; DC; DC = DC->getParent()) { 741 // FIXME: could stop early at namespace scope. 742 if (DC->isRecord()) { 743 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 744 if (Context.getTypeDeclType(Record)->isDependentType()) { 745 Dependent = true; 746 break; 747 } 748 } 749 } 750 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 751 } 752 } 753 } 754 755 // We may have found a field within an anonymous union or struct 756 // (C++ [class.union]). 757 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 758 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 759 return BuildAnonymousStructUnionMemberReference(Loc, FD); 760 761 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 762 if (!MD->isStatic()) { 763 // C++ [class.mfct.nonstatic]p2: 764 // [...] if name lookup (3.4.1) resolves the name in the 765 // id-expression to a nonstatic nontype member of class X or of 766 // a base class of X, the id-expression is transformed into a 767 // class member access expression (5.2.5) using (*this) (9.3.2) 768 // as the postfix-expression to the left of the '.' operator. 769 DeclContext *Ctx = 0; 770 QualType MemberType; 771 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 772 Ctx = FD->getDeclContext(); 773 MemberType = FD->getType(); 774 775 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 776 MemberType = RefType->getPointeeType(); 777 else if (!FD->isMutable()) { 778 unsigned combinedQualifiers 779 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 780 MemberType = MemberType.getQualifiedType(combinedQualifiers); 781 } 782 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 783 if (!Method->isStatic()) { 784 Ctx = Method->getParent(); 785 MemberType = Method->getType(); 786 } 787 } else if (OverloadedFunctionDecl *Ovl 788 = dyn_cast<OverloadedFunctionDecl>(D)) { 789 for (OverloadedFunctionDecl::function_iterator 790 Func = Ovl->function_begin(), 791 FuncEnd = Ovl->function_end(); 792 Func != FuncEnd; ++Func) { 793 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 794 if (!DMethod->isStatic()) { 795 Ctx = Ovl->getDeclContext(); 796 MemberType = Context.OverloadTy; 797 break; 798 } 799 } 800 } 801 802 if (Ctx && Ctx->isRecord()) { 803 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 804 QualType ThisType = Context.getTagDeclType(MD->getParent()); 805 if ((Context.getCanonicalType(CtxType) 806 == Context.getCanonicalType(ThisType)) || 807 IsDerivedFrom(ThisType, CtxType)) { 808 // Build the implicit member access expression. 809 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 810 MD->getThisType(Context)); 811 return Owned(new (Context) MemberExpr(This, true, D, 812 SourceLocation(), MemberType)); 813 } 814 } 815 } 816 } 817 818 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 819 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 820 if (MD->isStatic()) 821 // "invalid use of member 'x' in static member function" 822 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 823 << FD->getDeclName()); 824 } 825 826 // Any other ways we could have found the field in a well-formed 827 // program would have been turned into implicit member expressions 828 // above. 829 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 830 << FD->getDeclName()); 831 } 832 833 if (isa<TypedefDecl>(D)) 834 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 835 if (isa<ObjCInterfaceDecl>(D)) 836 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 837 if (isa<NamespaceDecl>(D)) 838 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 839 840 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 841 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 842 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 843 false, false, SS)); 844 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 845 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 846 false, false, SS)); 847 ValueDecl *VD = cast<ValueDecl>(D); 848 849 // Check whether this declaration can be used. Note that we suppress 850 // this check when we're going to perform argument-dependent lookup 851 // on this function name, because this might not be the function 852 // that overload resolution actually selects. 853 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 854 return ExprError(); 855 856 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 857 // Warn about constructs like: 858 // if (void *X = foo()) { ... } else { X }. 859 // In the else block, the pointer is always false. 860 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 861 Scope *CheckS = S; 862 while (CheckS) { 863 if (CheckS->isWithinElse() && 864 CheckS->getControlParent()->isDeclScope(Var)) { 865 if (Var->getType()->isBooleanType()) 866 ExprError(Diag(Loc, diag::warn_value_always_false) 867 << Var->getDeclName()); 868 else 869 ExprError(Diag(Loc, diag::warn_value_always_zero) 870 << Var->getDeclName()); 871 break; 872 } 873 874 // Move up one more control parent to check again. 875 CheckS = CheckS->getControlParent(); 876 if (CheckS) 877 CheckS = CheckS->getParent(); 878 } 879 } 880 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 881 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 882 // C99 DR 316 says that, if a function type comes from a 883 // function definition (without a prototype), that type is only 884 // used for checking compatibility. Therefore, when referencing 885 // the function, we pretend that we don't have the full function 886 // type. 887 QualType T = Func->getType(); 888 QualType NoProtoType = T; 889 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 890 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 891 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 892 } 893 } 894 895 // Only create DeclRefExpr's for valid Decl's. 896 if (VD->isInvalidDecl()) 897 return ExprError(); 898 899 // If the identifier reference is inside a block, and it refers to a value 900 // that is outside the block, create a BlockDeclRefExpr instead of a 901 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 902 // the block is formed. 903 // 904 // We do not do this for things like enum constants, global variables, etc, 905 // as they do not get snapshotted. 906 // 907 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 908 // Blocks that have these can't be constant. 909 CurBlock->hasBlockDeclRefExprs = true; 910 911 // The BlocksAttr indicates the variable is bound by-reference. 912 if (VD->getAttr<BlocksAttr>()) 913 return Owned(new (Context) BlockDeclRefExpr(VD, 914 VD->getType().getNonReferenceType(), Loc, true)); 915 916 // Variable will be bound by-copy, make it const within the closure. 917 VD->getType().addConst(); 918 return Owned(new (Context) BlockDeclRefExpr(VD, 919 VD->getType().getNonReferenceType(), Loc, false)); 920 } 921 // If this reference is not in a block or if the referenced variable is 922 // within the block, create a normal DeclRefExpr. 923 924 bool TypeDependent = false; 925 bool ValueDependent = false; 926 if (getLangOptions().CPlusPlus) { 927 // C++ [temp.dep.expr]p3: 928 // An id-expression is type-dependent if it contains: 929 // - an identifier that was declared with a dependent type, 930 if (VD->getType()->isDependentType()) 931 TypeDependent = true; 932 // - FIXME: a template-id that is dependent, 933 // - a conversion-function-id that specifies a dependent type, 934 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 935 Name.getCXXNameType()->isDependentType()) 936 TypeDependent = true; 937 // - a nested-name-specifier that contains a class-name that 938 // names a dependent type. 939 else if (SS && !SS->isEmpty()) { 940 for (DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 941 DC; DC = DC->getParent()) { 942 // FIXME: could stop early at namespace scope. 943 if (DC->isRecord()) { 944 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 945 if (Context.getTypeDeclType(Record)->isDependentType()) { 946 TypeDependent = true; 947 break; 948 } 949 } 950 } 951 } 952 953 // C++ [temp.dep.constexpr]p2: 954 // 955 // An identifier is value-dependent if it is: 956 // - a name declared with a dependent type, 957 if (TypeDependent) 958 ValueDependent = true; 959 // - the name of a non-type template parameter, 960 else if (isa<NonTypeTemplateParmDecl>(VD)) 961 ValueDependent = true; 962 // - a constant with integral or enumeration type and is 963 // initialized with an expression that is value-dependent 964 // (FIXME!). 965 } 966 967 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 968 TypeDependent, ValueDependent, SS)); 969} 970 971Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 972 tok::TokenKind Kind) { 973 PredefinedExpr::IdentType IT; 974 975 switch (Kind) { 976 default: assert(0 && "Unknown simple primary expr!"); 977 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 978 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 979 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 980 } 981 982 // Pre-defined identifiers are of type char[x], where x is the length of the 983 // string. 984 unsigned Length; 985 if (FunctionDecl *FD = getCurFunctionDecl()) 986 Length = FD->getIdentifier()->getLength(); 987 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 988 Length = MD->getSynthesizedMethodSize(); 989 else { 990 Diag(Loc, diag::ext_predef_outside_function); 991 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 992 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 993 } 994 995 996 llvm::APInt LengthI(32, Length + 1); 997 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 998 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 999 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1000} 1001 1002Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1003 llvm::SmallString<16> CharBuffer; 1004 CharBuffer.resize(Tok.getLength()); 1005 const char *ThisTokBegin = &CharBuffer[0]; 1006 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1007 1008 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1009 Tok.getLocation(), PP); 1010 if (Literal.hadError()) 1011 return ExprError(); 1012 1013 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1014 1015 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1016 Literal.isWide(), 1017 type, Tok.getLocation())); 1018} 1019 1020Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1021 // Fast path for a single digit (which is quite common). A single digit 1022 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1023 if (Tok.getLength() == 1) { 1024 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1025 unsigned IntSize = Context.Target.getIntWidth(); 1026 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1027 Context.IntTy, Tok.getLocation())); 1028 } 1029 1030 llvm::SmallString<512> IntegerBuffer; 1031 // Add padding so that NumericLiteralParser can overread by one character. 1032 IntegerBuffer.resize(Tok.getLength()+1); 1033 const char *ThisTokBegin = &IntegerBuffer[0]; 1034 1035 // Get the spelling of the token, which eliminates trigraphs, etc. 1036 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1037 1038 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1039 Tok.getLocation(), PP); 1040 if (Literal.hadError) 1041 return ExprError(); 1042 1043 Expr *Res; 1044 1045 if (Literal.isFloatingLiteral()) { 1046 QualType Ty; 1047 if (Literal.isFloat) 1048 Ty = Context.FloatTy; 1049 else if (!Literal.isLong) 1050 Ty = Context.DoubleTy; 1051 else 1052 Ty = Context.LongDoubleTy; 1053 1054 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1055 1056 // isExact will be set by GetFloatValue(). 1057 bool isExact = false; 1058 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1059 &isExact, Ty, Tok.getLocation()); 1060 1061 } else if (!Literal.isIntegerLiteral()) { 1062 return ExprError(); 1063 } else { 1064 QualType Ty; 1065 1066 // long long is a C99 feature. 1067 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1068 Literal.isLongLong) 1069 Diag(Tok.getLocation(), diag::ext_longlong); 1070 1071 // Get the value in the widest-possible width. 1072 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1073 1074 if (Literal.GetIntegerValue(ResultVal)) { 1075 // If this value didn't fit into uintmax_t, warn and force to ull. 1076 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1077 Ty = Context.UnsignedLongLongTy; 1078 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1079 "long long is not intmax_t?"); 1080 } else { 1081 // If this value fits into a ULL, try to figure out what else it fits into 1082 // according to the rules of C99 6.4.4.1p5. 1083 1084 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1085 // be an unsigned int. 1086 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1087 1088 // Check from smallest to largest, picking the smallest type we can. 1089 unsigned Width = 0; 1090 if (!Literal.isLong && !Literal.isLongLong) { 1091 // Are int/unsigned possibilities? 1092 unsigned IntSize = Context.Target.getIntWidth(); 1093 1094 // Does it fit in a unsigned int? 1095 if (ResultVal.isIntN(IntSize)) { 1096 // Does it fit in a signed int? 1097 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1098 Ty = Context.IntTy; 1099 else if (AllowUnsigned) 1100 Ty = Context.UnsignedIntTy; 1101 Width = IntSize; 1102 } 1103 } 1104 1105 // Are long/unsigned long possibilities? 1106 if (Ty.isNull() && !Literal.isLongLong) { 1107 unsigned LongSize = Context.Target.getLongWidth(); 1108 1109 // Does it fit in a unsigned long? 1110 if (ResultVal.isIntN(LongSize)) { 1111 // Does it fit in a signed long? 1112 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1113 Ty = Context.LongTy; 1114 else if (AllowUnsigned) 1115 Ty = Context.UnsignedLongTy; 1116 Width = LongSize; 1117 } 1118 } 1119 1120 // Finally, check long long if needed. 1121 if (Ty.isNull()) { 1122 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1123 1124 // Does it fit in a unsigned long long? 1125 if (ResultVal.isIntN(LongLongSize)) { 1126 // Does it fit in a signed long long? 1127 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1128 Ty = Context.LongLongTy; 1129 else if (AllowUnsigned) 1130 Ty = Context.UnsignedLongLongTy; 1131 Width = LongLongSize; 1132 } 1133 } 1134 1135 // If we still couldn't decide a type, we probably have something that 1136 // does not fit in a signed long long, but has no U suffix. 1137 if (Ty.isNull()) { 1138 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1139 Ty = Context.UnsignedLongLongTy; 1140 Width = Context.Target.getLongLongWidth(); 1141 } 1142 1143 if (ResultVal.getBitWidth() != Width) 1144 ResultVal.trunc(Width); 1145 } 1146 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1147 } 1148 1149 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1150 if (Literal.isImaginary) 1151 Res = new (Context) ImaginaryLiteral(Res, 1152 Context.getComplexType(Res->getType())); 1153 1154 return Owned(Res); 1155} 1156 1157Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1158 SourceLocation R, ExprArg Val) { 1159 Expr *E = (Expr *)Val.release(); 1160 assert((E != 0) && "ActOnParenExpr() missing expr"); 1161 return Owned(new (Context) ParenExpr(L, R, E)); 1162} 1163 1164/// The UsualUnaryConversions() function is *not* called by this routine. 1165/// See C99 6.3.2.1p[2-4] for more details. 1166bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1167 SourceLocation OpLoc, 1168 const SourceRange &ExprRange, 1169 bool isSizeof) { 1170 if (exprType->isDependentType()) 1171 return false; 1172 1173 // C99 6.5.3.4p1: 1174 if (isa<FunctionType>(exprType)) { 1175 // alignof(function) is allowed. 1176 if (isSizeof) 1177 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1178 return false; 1179 } 1180 1181 if (exprType->isVoidType()) { 1182 Diag(OpLoc, diag::ext_sizeof_void_type) 1183 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1184 return false; 1185 } 1186 1187 return DiagnoseIncompleteType(OpLoc, exprType, 1188 isSizeof ? diag::err_sizeof_incomplete_type : 1189 diag::err_alignof_incomplete_type, 1190 ExprRange); 1191} 1192 1193bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1194 const SourceRange &ExprRange) { 1195 E = E->IgnoreParens(); 1196 1197 // alignof decl is always ok. 1198 if (isa<DeclRefExpr>(E)) 1199 return false; 1200 1201 // Cannot know anything else if the expression is dependent. 1202 if (E->isTypeDependent()) 1203 return false; 1204 1205 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1206 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { 1207 if (FD->isBitField()) { 1208 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1209 return true; 1210 } 1211 // Other fields are ok. 1212 return false; 1213 } 1214 } 1215 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1216} 1217 1218/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1219/// the same for @c alignof and @c __alignof 1220/// Note that the ArgRange is invalid if isType is false. 1221Action::OwningExprResult 1222Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1223 void *TyOrEx, const SourceRange &ArgRange) { 1224 // If error parsing type, ignore. 1225 if (TyOrEx == 0) return ExprError(); 1226 1227 QualType ArgTy; 1228 SourceRange Range; 1229 if (isType) { 1230 ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1231 Range = ArgRange; 1232 1233 // Verify that the operand is valid. 1234 if (CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, isSizeof)) 1235 return ExprError(); 1236 } else { 1237 // Get the end location. 1238 Expr *ArgEx = (Expr *)TyOrEx; 1239 Range = ArgEx->getSourceRange(); 1240 ArgTy = ArgEx->getType(); 1241 1242 // Verify that the operand is valid. 1243 bool isInvalid; 1244 if (!isSizeof) { 1245 isInvalid = CheckAlignOfExpr(ArgEx, OpLoc, Range); 1246 } else if (ArgEx->isBitField()) { // C99 6.5.3.4p1. 1247 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1248 isInvalid = true; 1249 } else { 1250 isInvalid = CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, true); 1251 } 1252 1253 if (isInvalid) { 1254 DeleteExpr(ArgEx); 1255 return ExprError(); 1256 } 1257 } 1258 1259 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1260 return Owned(new (Context) SizeOfAlignOfExpr(isSizeof, isType, TyOrEx, 1261 Context.getSizeType(), OpLoc, 1262 Range.getEnd())); 1263} 1264 1265QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1266 if (V->isTypeDependent()) 1267 return Context.DependentTy; 1268 1269 DefaultFunctionArrayConversion(V); 1270 1271 // These operators return the element type of a complex type. 1272 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1273 return CT->getElementType(); 1274 1275 // Otherwise they pass through real integer and floating point types here. 1276 if (V->getType()->isArithmeticType()) 1277 return V->getType(); 1278 1279 // Reject anything else. 1280 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1281 << (isReal ? "__real" : "__imag"); 1282 return QualType(); 1283} 1284 1285 1286 1287Action::OwningExprResult 1288Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1289 tok::TokenKind Kind, ExprArg Input) { 1290 Expr *Arg = (Expr *)Input.get(); 1291 1292 UnaryOperator::Opcode Opc; 1293 switch (Kind) { 1294 default: assert(0 && "Unknown unary op!"); 1295 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1296 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1297 } 1298 1299 if (getLangOptions().CPlusPlus && 1300 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1301 // Which overloaded operator? 1302 OverloadedOperatorKind OverOp = 1303 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1304 1305 // C++ [over.inc]p1: 1306 // 1307 // [...] If the function is a member function with one 1308 // parameter (which shall be of type int) or a non-member 1309 // function with two parameters (the second of which shall be 1310 // of type int), it defines the postfix increment operator ++ 1311 // for objects of that type. When the postfix increment is 1312 // called as a result of using the ++ operator, the int 1313 // argument will have value zero. 1314 Expr *Args[2] = { 1315 Arg, 1316 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1317 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1318 }; 1319 1320 // Build the candidate set for overloading 1321 OverloadCandidateSet CandidateSet; 1322 if (AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet)) 1323 return ExprError(); 1324 1325 // Perform overload resolution. 1326 OverloadCandidateSet::iterator Best; 1327 switch (BestViableFunction(CandidateSet, Best)) { 1328 case OR_Success: { 1329 // We found a built-in operator or an overloaded operator. 1330 FunctionDecl *FnDecl = Best->Function; 1331 1332 if (FnDecl) { 1333 // We matched an overloaded operator. Build a call to that 1334 // operator. 1335 1336 // Convert the arguments. 1337 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1338 if (PerformObjectArgumentInitialization(Arg, Method)) 1339 return ExprError(); 1340 } else { 1341 // Convert the arguments. 1342 if (PerformCopyInitialization(Arg, 1343 FnDecl->getParamDecl(0)->getType(), 1344 "passing")) 1345 return ExprError(); 1346 } 1347 1348 // Determine the result type 1349 QualType ResultTy 1350 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1351 ResultTy = ResultTy.getNonReferenceType(); 1352 1353 // Build the actual expression node. 1354 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1355 SourceLocation()); 1356 UsualUnaryConversions(FnExpr); 1357 1358 Input.release(); 1359 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 1360 ResultTy, OpLoc)); 1361 } else { 1362 // We matched a built-in operator. Convert the arguments, then 1363 // break out so that we will build the appropriate built-in 1364 // operator node. 1365 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1366 "passing")) 1367 return ExprError(); 1368 1369 break; 1370 } 1371 } 1372 1373 case OR_No_Viable_Function: 1374 // No viable function; fall through to handling this as a 1375 // built-in operator, which will produce an error message for us. 1376 break; 1377 1378 case OR_Ambiguous: 1379 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1380 << UnaryOperator::getOpcodeStr(Opc) 1381 << Arg->getSourceRange(); 1382 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1383 return ExprError(); 1384 1385 case OR_Deleted: 1386 Diag(OpLoc, diag::err_ovl_deleted_oper) 1387 << Best->Function->isDeleted() 1388 << UnaryOperator::getOpcodeStr(Opc) 1389 << Arg->getSourceRange(); 1390 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1391 return ExprError(); 1392 } 1393 1394 // Either we found no viable overloaded operator or we matched a 1395 // built-in operator. In either case, fall through to trying to 1396 // build a built-in operation. 1397 } 1398 1399 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1400 Opc == UnaryOperator::PostInc); 1401 if (result.isNull()) 1402 return ExprError(); 1403 Input.release(); 1404 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1405} 1406 1407Action::OwningExprResult 1408Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1409 ExprArg Idx, SourceLocation RLoc) { 1410 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1411 *RHSExp = static_cast<Expr*>(Idx.get()); 1412 1413 if (getLangOptions().CPlusPlus && 1414 (LHSExp->getType()->isRecordType() || 1415 LHSExp->getType()->isEnumeralType() || 1416 RHSExp->getType()->isRecordType() || 1417 RHSExp->getType()->isEnumeralType())) { 1418 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1419 // to the candidate set. 1420 OverloadCandidateSet CandidateSet; 1421 Expr *Args[2] = { LHSExp, RHSExp }; 1422 if (AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1423 SourceRange(LLoc, RLoc))) 1424 return ExprError(); 1425 1426 // Perform overload resolution. 1427 OverloadCandidateSet::iterator Best; 1428 switch (BestViableFunction(CandidateSet, Best)) { 1429 case OR_Success: { 1430 // We found a built-in operator or an overloaded operator. 1431 FunctionDecl *FnDecl = Best->Function; 1432 1433 if (FnDecl) { 1434 // We matched an overloaded operator. Build a call to that 1435 // operator. 1436 1437 // Convert the arguments. 1438 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1439 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1440 PerformCopyInitialization(RHSExp, 1441 FnDecl->getParamDecl(0)->getType(), 1442 "passing")) 1443 return ExprError(); 1444 } else { 1445 // Convert the arguments. 1446 if (PerformCopyInitialization(LHSExp, 1447 FnDecl->getParamDecl(0)->getType(), 1448 "passing") || 1449 PerformCopyInitialization(RHSExp, 1450 FnDecl->getParamDecl(1)->getType(), 1451 "passing")) 1452 return ExprError(); 1453 } 1454 1455 // Determine the result type 1456 QualType ResultTy 1457 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1458 ResultTy = ResultTy.getNonReferenceType(); 1459 1460 // Build the actual expression node. 1461 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1462 SourceLocation()); 1463 UsualUnaryConversions(FnExpr); 1464 1465 Base.release(); 1466 Idx.release(); 1467 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 1468 ResultTy, LLoc)); 1469 } else { 1470 // We matched a built-in operator. Convert the arguments, then 1471 // break out so that we will build the appropriate built-in 1472 // operator node. 1473 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1474 "passing") || 1475 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1476 "passing")) 1477 return ExprError(); 1478 1479 break; 1480 } 1481 } 1482 1483 case OR_No_Viable_Function: 1484 // No viable function; fall through to handling this as a 1485 // built-in operator, which will produce an error message for us. 1486 break; 1487 1488 case OR_Ambiguous: 1489 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1490 << "[]" 1491 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1492 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1493 return ExprError(); 1494 1495 case OR_Deleted: 1496 Diag(LLoc, diag::err_ovl_deleted_oper) 1497 << Best->Function->isDeleted() 1498 << "[]" 1499 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1500 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1501 return ExprError(); 1502 } 1503 1504 // Either we found no viable overloaded operator or we matched a 1505 // built-in operator. In either case, fall through to trying to 1506 // build a built-in operation. 1507 } 1508 1509 // Perform default conversions. 1510 DefaultFunctionArrayConversion(LHSExp); 1511 DefaultFunctionArrayConversion(RHSExp); 1512 1513 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1514 1515 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1516 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1517 // in the subscript position. As a result, we need to derive the array base 1518 // and index from the expression types. 1519 Expr *BaseExpr, *IndexExpr; 1520 QualType ResultType; 1521 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1522 BaseExpr = LHSExp; 1523 IndexExpr = RHSExp; 1524 ResultType = Context.DependentTy; 1525 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1526 BaseExpr = LHSExp; 1527 IndexExpr = RHSExp; 1528 // FIXME: need to deal with const... 1529 ResultType = PTy->getPointeeType(); 1530 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1531 // Handle the uncommon case of "123[Ptr]". 1532 BaseExpr = RHSExp; 1533 IndexExpr = LHSExp; 1534 // FIXME: need to deal with const... 1535 ResultType = PTy->getPointeeType(); 1536 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1537 BaseExpr = LHSExp; // vectors: V[123] 1538 IndexExpr = RHSExp; 1539 1540 // FIXME: need to deal with const... 1541 ResultType = VTy->getElementType(); 1542 } else { 1543 return ExprError(Diag(LHSExp->getLocStart(), 1544 diag::err_typecheck_subscript_value) << RHSExp->getSourceRange()); 1545 } 1546 // C99 6.5.2.1p1 1547 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1548 return ExprError(Diag(IndexExpr->getLocStart(), 1549 diag::err_typecheck_subscript) << IndexExpr->getSourceRange()); 1550 1551 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 1552 // the following check catches trying to index a pointer to a function (e.g. 1553 // void (*)(int)) and pointers to incomplete types. Functions are not 1554 // objects in C99. 1555 if (!ResultType->isObjectType() && !ResultType->isDependentType()) 1556 return ExprError(Diag(BaseExpr->getLocStart(), 1557 diag::err_typecheck_subscript_not_object) 1558 << BaseExpr->getType() << BaseExpr->getSourceRange()); 1559 1560 Base.release(); 1561 Idx.release(); 1562 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1563 ResultType, RLoc)); 1564} 1565 1566QualType Sema:: 1567CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1568 IdentifierInfo &CompName, SourceLocation CompLoc) { 1569 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1570 1571 // The vector accessor can't exceed the number of elements. 1572 const char *compStr = CompName.getName(); 1573 1574 // This flag determines whether or not the component is one of the four 1575 // special names that indicate a subset of exactly half the elements are 1576 // to be selected. 1577 bool HalvingSwizzle = false; 1578 1579 // This flag determines whether or not CompName has an 's' char prefix, 1580 // indicating that it is a string of hex values to be used as vector indices. 1581 bool HexSwizzle = *compStr == 's'; 1582 1583 // Check that we've found one of the special components, or that the component 1584 // names must come from the same set. 1585 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1586 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1587 HalvingSwizzle = true; 1588 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1589 do 1590 compStr++; 1591 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1592 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1593 do 1594 compStr++; 1595 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1596 } 1597 1598 if (!HalvingSwizzle && *compStr) { 1599 // We didn't get to the end of the string. This means the component names 1600 // didn't come from the same set *or* we encountered an illegal name. 1601 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1602 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1603 return QualType(); 1604 } 1605 1606 // Ensure no component accessor exceeds the width of the vector type it 1607 // operates on. 1608 if (!HalvingSwizzle) { 1609 compStr = CompName.getName(); 1610 1611 if (HexSwizzle) 1612 compStr++; 1613 1614 while (*compStr) { 1615 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1616 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1617 << baseType << SourceRange(CompLoc); 1618 return QualType(); 1619 } 1620 } 1621 } 1622 1623 // If this is a halving swizzle, verify that the base type has an even 1624 // number of elements. 1625 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1626 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1627 << baseType << SourceRange(CompLoc); 1628 return QualType(); 1629 } 1630 1631 // The component accessor looks fine - now we need to compute the actual type. 1632 // The vector type is implied by the component accessor. For example, 1633 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1634 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1635 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1636 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1637 : CompName.getLength(); 1638 if (HexSwizzle) 1639 CompSize--; 1640 1641 if (CompSize == 1) 1642 return vecType->getElementType(); 1643 1644 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1645 // Now look up the TypeDefDecl from the vector type. Without this, 1646 // diagostics look bad. We want extended vector types to appear built-in. 1647 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1648 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1649 return Context.getTypedefType(ExtVectorDecls[i]); 1650 } 1651 return VT; // should never get here (a typedef type should always be found). 1652} 1653 1654 1655/// constructSetterName - Return the setter name for the given 1656/// identifier, i.e. "set" + Name where the initial character of Name 1657/// has been capitalized. 1658// FIXME: Merge with same routine in Parser. But where should this 1659// live? 1660static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 1661 const IdentifierInfo *Name) { 1662 llvm::SmallString<100> SelectorName; 1663 SelectorName = "set"; 1664 SelectorName.append(Name->getName(), Name->getName()+Name->getLength()); 1665 SelectorName[3] = toupper(SelectorName[3]); 1666 return &Idents.get(&SelectorName[0], &SelectorName[SelectorName.size()]); 1667} 1668 1669ObjCImplementationDecl *getCurImplementationDecl(DeclContext *DC) { 1670 while (DC && !isa<ObjCImplementationDecl>(DC)) 1671 DC = DC->getParent(); 1672 return dyn_cast_or_null<ObjCImplementationDecl>(DC); 1673} 1674 1675Action::OwningExprResult 1676Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1677 tok::TokenKind OpKind, SourceLocation MemberLoc, 1678 IdentifierInfo &Member) { 1679 Expr *BaseExpr = static_cast<Expr *>(Base.release()); 1680 assert(BaseExpr && "no record expression"); 1681 1682 // Perform default conversions. 1683 DefaultFunctionArrayConversion(BaseExpr); 1684 1685 QualType BaseType = BaseExpr->getType(); 1686 assert(!BaseType.isNull() && "no type for member expression"); 1687 1688 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1689 // must have pointer type, and the accessed type is the pointee. 1690 if (OpKind == tok::arrow) { 1691 if (const PointerType *PT = BaseType->getAsPointerType()) 1692 BaseType = PT->getPointeeType(); 1693 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1694 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1695 MemberLoc, Member)); 1696 else 1697 return ExprError(Diag(MemberLoc, 1698 diag::err_typecheck_member_reference_arrow) 1699 << BaseType << BaseExpr->getSourceRange()); 1700 } 1701 1702 // Handle field access to simple records. This also handles access to fields 1703 // of the ObjC 'id' struct. 1704 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1705 RecordDecl *RDecl = RTy->getDecl(); 1706 if (DiagnoseIncompleteType(OpLoc, BaseType, 1707 diag::err_typecheck_incomplete_tag, 1708 BaseExpr->getSourceRange())) 1709 return ExprError(); 1710 1711 // The record definition is complete, now make sure the member is valid. 1712 // FIXME: Qualified name lookup for C++ is a bit more complicated 1713 // than this. 1714 LookupResult Result 1715 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1716 LookupMemberName, false); 1717 1718 NamedDecl *MemberDecl = 0; 1719 if (!Result) 1720 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1721 << &Member << BaseExpr->getSourceRange()); 1722 else if (Result.isAmbiguous()) { 1723 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1724 MemberLoc, BaseExpr->getSourceRange()); 1725 return ExprError(); 1726 } else 1727 MemberDecl = Result; 1728 1729 // If the decl being referenced had an error, return an error for this 1730 // sub-expr without emitting another error, in order to avoid cascading 1731 // error cases. 1732 if (MemberDecl->isInvalidDecl()) 1733 return ExprError(); 1734 1735 // Check the use of this field 1736 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 1737 return ExprError(); 1738 1739 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1740 // We may have found a field within an anonymous union or struct 1741 // (C++ [class.union]). 1742 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1743 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1744 BaseExpr, OpLoc); 1745 1746 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1747 // FIXME: Handle address space modifiers 1748 QualType MemberType = FD->getType(); 1749 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1750 MemberType = Ref->getPointeeType(); 1751 else { 1752 unsigned combinedQualifiers = 1753 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1754 if (FD->isMutable()) 1755 combinedQualifiers &= ~QualType::Const; 1756 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1757 } 1758 1759 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1760 MemberLoc, MemberType)); 1761 } else if (CXXClassVarDecl *Var = dyn_cast<CXXClassVarDecl>(MemberDecl)) 1762 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1763 Var, MemberLoc, 1764 Var->getType().getNonReferenceType())); 1765 else if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 1766 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1767 MemberFn, MemberLoc, MemberFn->getType())); 1768 else if (OverloadedFunctionDecl *Ovl 1769 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 1770 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 1771 MemberLoc, Context.OverloadTy)); 1772 else if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 1773 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1774 Enum, MemberLoc, Enum->getType())); 1775 else if (isa<TypeDecl>(MemberDecl)) 1776 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 1777 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1778 1779 // We found a declaration kind that we didn't expect. This is a 1780 // generic error message that tells the user that she can't refer 1781 // to this member with '.' or '->'. 1782 return ExprError(Diag(MemberLoc, 1783 diag::err_typecheck_member_reference_unknown) 1784 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1785 } 1786 1787 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1788 // (*Obj).ivar. 1789 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1790 ObjCInterfaceDecl *ClassDeclared; 1791 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member, 1792 ClassDeclared)) { 1793 // If the decl being referenced had an error, return an error for this 1794 // sub-expr without emitting another error, in order to avoid cascading 1795 // error cases. 1796 if (IV->isInvalidDecl()) 1797 return ExprError(); 1798 1799 // Check whether we can reference this field. 1800 if (DiagnoseUseOfDecl(IV, MemberLoc)) 1801 return ExprError(); 1802 if (IV->getAccessControl() != ObjCIvarDecl::Public) { 1803 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 1804 if (ObjCMethodDecl *MD = getCurMethodDecl()) 1805 ClassOfMethodDecl = MD->getClassInterface(); 1806 else if (FunctionDecl *FD = getCurFunctionDecl()) { 1807 // FIXME: This isn't working yet. Will discuss with Fariborz. 1808 // FIXME: Should be ObjCImplDecl, so categories can work. 1809 // Need to fiddle with castToDeclContext/castFromDeclContext. 1810 ObjCImplementationDecl *ImpDecl = getCurImplementationDecl(FD); 1811 if (ImpDecl) 1812 ClassOfMethodDecl = ImpDecl->getClassInterface(); 1813 } 1814 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 1815 if (ClassDeclared != IFTy->getDecl() || 1816 (ClassOfMethodDecl && (ClassOfMethodDecl != ClassDeclared))) 1817 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 1818 } 1819 // @protected 1820 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 1821 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 1822 } 1823 1824 ObjCIvarRefExpr *MRef= new (Context) ObjCIvarRefExpr(IV, IV->getType(), 1825 MemberLoc, BaseExpr, 1826 OpKind == tok::arrow); 1827 Context.setFieldDecl(IFTy->getDecl(), IV, MRef); 1828 return Owned(MRef); 1829 } 1830 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1831 << IFTy->getDecl()->getDeclName() << &Member 1832 << BaseExpr->getSourceRange()); 1833 } 1834 1835 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1836 // pointer to a (potentially qualified) interface type. 1837 const PointerType *PTy; 1838 const ObjCInterfaceType *IFTy; 1839 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1840 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1841 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1842 1843 // Search for a declared property first. 1844 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) { 1845 // Check whether we can reference this property. 1846 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1847 return ExprError(); 1848 1849 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1850 MemberLoc, BaseExpr)); 1851 } 1852 1853 // Check protocols on qualified interfaces. 1854 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1855 E = IFTy->qual_end(); I != E; ++I) 1856 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1857 // Check whether we can reference this property. 1858 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1859 return ExprError(); 1860 1861 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1862 MemberLoc, BaseExpr)); 1863 } 1864 1865 // If that failed, look for an "implicit" property by seeing if the nullary 1866 // selector is implemented. 1867 1868 // FIXME: The logic for looking up nullary and unary selectors should be 1869 // shared with the code in ActOnInstanceMessage. 1870 1871 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1872 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1873 1874 // If this reference is in an @implementation, check for 'private' methods. 1875 if (!Getter) 1876 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1877 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1878 if (ObjCImplementationDecl *ImpDecl = 1879 ObjCImplementations[ClassDecl->getIdentifier()]) 1880 Getter = ImpDecl->getInstanceMethod(Sel); 1881 1882 // Look through local category implementations associated with the class. 1883 if (!Getter) { 1884 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1885 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1886 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1887 } 1888 } 1889 if (Getter) { 1890 // Check if we can reference this property. 1891 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1892 return ExprError(); 1893 1894 // If we found a getter then this may be a valid dot-reference, we 1895 // will look for the matching setter, in case it is needed. 1896 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 1897 &Member); 1898 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 1899 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1900 if (!Setter) { 1901 // If this reference is in an @implementation, also check for 'private' 1902 // methods. 1903 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1904 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1905 if (ObjCImplementationDecl *ImpDecl = 1906 ObjCImplementations[ClassDecl->getIdentifier()]) 1907 Setter = ImpDecl->getInstanceMethod(SetterSel); 1908 } 1909 // Look through local category implementations associated with the class. 1910 if (!Setter) { 1911 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 1912 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1913 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 1914 } 1915 } 1916 1917 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1918 return ExprError(); 1919 1920 // FIXME: we must check that the setter has property type. 1921 return Owned(new (Context) ObjCKVCRefExpr(Getter, Getter->getResultType(), 1922 Setter, MemberLoc, BaseExpr)); 1923 } 1924 1925 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 1926 << &Member << BaseType); 1927 } 1928 // Handle properties on qualified "id" protocols. 1929 const ObjCQualifiedIdType *QIdTy; 1930 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1931 // Check protocols on qualified interfaces. 1932 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1933 E = QIdTy->qual_end(); I != E; ++I) { 1934 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1935 // Check the use of this declaration 1936 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1937 return ExprError(); 1938 1939 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1940 MemberLoc, BaseExpr)); 1941 } 1942 // Also must look for a getter name which uses property syntax. 1943 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1944 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1945 // Check the use of this method. 1946 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 1947 return ExprError(); 1948 1949 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 1950 OMD->getResultType(), OMD, OpLoc, MemberLoc, NULL, 0)); 1951 } 1952 } 1953 1954 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 1955 << &Member << BaseType); 1956 } 1957 // Handle 'field access' to vectors, such as 'V.xx'. 1958 if (BaseType->isExtVectorType()) { 1959 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1960 if (ret.isNull()) 1961 return ExprError(); 1962 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 1963 MemberLoc)); 1964 } 1965 1966 return ExprError(Diag(MemberLoc, 1967 diag::err_typecheck_member_reference_struct_union) 1968 << BaseType << BaseExpr->getSourceRange()); 1969} 1970 1971/// ConvertArgumentsForCall - Converts the arguments specified in 1972/// Args/NumArgs to the parameter types of the function FDecl with 1973/// function prototype Proto. Call is the call expression itself, and 1974/// Fn is the function expression. For a C++ member function, this 1975/// routine does not attempt to convert the object argument. Returns 1976/// true if the call is ill-formed. 1977bool 1978Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 1979 FunctionDecl *FDecl, 1980 const FunctionProtoType *Proto, 1981 Expr **Args, unsigned NumArgs, 1982 SourceLocation RParenLoc) { 1983 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1984 // assignment, to the types of the corresponding parameter, ... 1985 unsigned NumArgsInProto = Proto->getNumArgs(); 1986 unsigned NumArgsToCheck = NumArgs; 1987 bool Invalid = false; 1988 1989 // If too few arguments are available (and we don't have default 1990 // arguments for the remaining parameters), don't make the call. 1991 if (NumArgs < NumArgsInProto) { 1992 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 1993 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 1994 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 1995 // Use default arguments for missing arguments 1996 NumArgsToCheck = NumArgsInProto; 1997 Call->setNumArgs(Context, NumArgsInProto); 1998 } 1999 2000 // If too many are passed and not variadic, error on the extras and drop 2001 // them. 2002 if (NumArgs > NumArgsInProto) { 2003 if (!Proto->isVariadic()) { 2004 Diag(Args[NumArgsInProto]->getLocStart(), 2005 diag::err_typecheck_call_too_many_args) 2006 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2007 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2008 Args[NumArgs-1]->getLocEnd()); 2009 // This deletes the extra arguments. 2010 Call->setNumArgs(Context, NumArgsInProto); 2011 Invalid = true; 2012 } 2013 NumArgsToCheck = NumArgsInProto; 2014 } 2015 2016 // Continue to check argument types (even if we have too few/many args). 2017 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2018 QualType ProtoArgType = Proto->getArgType(i); 2019 2020 Expr *Arg; 2021 if (i < NumArgs) { 2022 Arg = Args[i]; 2023 2024 // Pass the argument. 2025 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2026 return true; 2027 } else 2028 // We already type-checked the argument, so we know it works. 2029 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2030 QualType ArgType = Arg->getType(); 2031 2032 Call->setArg(i, Arg); 2033 } 2034 2035 // If this is a variadic call, handle args passed through "...". 2036 if (Proto->isVariadic()) { 2037 VariadicCallType CallType = VariadicFunction; 2038 if (Fn->getType()->isBlockPointerType()) 2039 CallType = VariadicBlock; // Block 2040 else if (isa<MemberExpr>(Fn)) 2041 CallType = VariadicMethod; 2042 2043 // Promote the arguments (C99 6.5.2.2p7). 2044 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2045 Expr *Arg = Args[i]; 2046 DefaultVariadicArgumentPromotion(Arg, CallType); 2047 Call->setArg(i, Arg); 2048 } 2049 } 2050 2051 return Invalid; 2052} 2053 2054/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2055/// This provides the location of the left/right parens and a list of comma 2056/// locations. 2057Action::OwningExprResult 2058Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2059 MultiExprArg args, 2060 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2061 unsigned NumArgs = args.size(); 2062 Expr *Fn = static_cast<Expr *>(fn.release()); 2063 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2064 assert(Fn && "no function call expression"); 2065 FunctionDecl *FDecl = NULL; 2066 DeclarationName UnqualifiedName; 2067 2068 if (getLangOptions().CPlusPlus) { 2069 // Determine whether this is a dependent call inside a C++ template, 2070 // in which case we won't do any semantic analysis now. 2071 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 2072 bool Dependent = false; 2073 if (Fn->isTypeDependent()) 2074 Dependent = true; 2075 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2076 Dependent = true; 2077 2078 if (Dependent) 2079 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2080 Context.DependentTy, RParenLoc)); 2081 2082 // Determine whether this is a call to an object (C++ [over.call.object]). 2083 if (Fn->getType()->isRecordType()) 2084 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2085 CommaLocs, RParenLoc)); 2086 2087 // Determine whether this is a call to a member function. 2088 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2089 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2090 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2091 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2092 CommaLocs, RParenLoc)); 2093 } 2094 2095 // If we're directly calling a function, get the appropriate declaration. 2096 DeclRefExpr *DRExpr = NULL; 2097 Expr *FnExpr = Fn; 2098 bool ADL = true; 2099 while (true) { 2100 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2101 FnExpr = IcExpr->getSubExpr(); 2102 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2103 // Parentheses around a function disable ADL 2104 // (C++0x [basic.lookup.argdep]p1). 2105 ADL = false; 2106 FnExpr = PExpr->getSubExpr(); 2107 } else if (isa<UnaryOperator>(FnExpr) && 2108 cast<UnaryOperator>(FnExpr)->getOpcode() 2109 == UnaryOperator::AddrOf) { 2110 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2111 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2112 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2113 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2114 break; 2115 } else if (UnresolvedFunctionNameExpr *DepName 2116 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2117 UnqualifiedName = DepName->getName(); 2118 break; 2119 } else { 2120 // Any kind of name that does not refer to a declaration (or 2121 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2122 ADL = false; 2123 break; 2124 } 2125 } 2126 2127 OverloadedFunctionDecl *Ovl = 0; 2128 if (DRExpr) { 2129 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2130 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2131 } 2132 2133 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2134 // We don't perform ADL for implicit declarations of builtins. 2135 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2136 ADL = false; 2137 2138 // We don't perform ADL in C. 2139 if (!getLangOptions().CPlusPlus) 2140 ADL = false; 2141 2142 if (Ovl || ADL) { 2143 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2144 UnqualifiedName, LParenLoc, Args, 2145 NumArgs, CommaLocs, RParenLoc, ADL); 2146 if (!FDecl) 2147 return ExprError(); 2148 2149 // Update Fn to refer to the actual function selected. 2150 Expr *NewFn = 0; 2151 if (QualifiedDeclRefExpr *QDRExpr 2152 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2153 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2154 QDRExpr->getLocation(), 2155 false, false, 2156 QDRExpr->getSourceRange().getBegin()); 2157 else 2158 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2159 Fn->getSourceRange().getBegin()); 2160 Fn->Destroy(Context); 2161 Fn = NewFn; 2162 } 2163 } 2164 2165 // Promote the function operand. 2166 UsualUnaryConversions(Fn); 2167 2168 // Make the call expr early, before semantic checks. This guarantees cleanup 2169 // of arguments and function on error. 2170 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2171 Args, NumArgs, 2172 Context.BoolTy, 2173 RParenLoc)); 2174 2175 const FunctionType *FuncT; 2176 if (!Fn->getType()->isBlockPointerType()) { 2177 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2178 // have type pointer to function". 2179 const PointerType *PT = Fn->getType()->getAsPointerType(); 2180 if (PT == 0) 2181 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2182 << Fn->getType() << Fn->getSourceRange()); 2183 FuncT = PT->getPointeeType()->getAsFunctionType(); 2184 } else { // This is a block call. 2185 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2186 getAsFunctionType(); 2187 } 2188 if (FuncT == 0) 2189 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2190 << Fn->getType() << Fn->getSourceRange()); 2191 2192 // We know the result type of the call, set it. 2193 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2194 2195 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2196 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2197 RParenLoc)) 2198 return ExprError(); 2199 } else { 2200 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2201 2202 // Promote the arguments (C99 6.5.2.2p6). 2203 for (unsigned i = 0; i != NumArgs; i++) { 2204 Expr *Arg = Args[i]; 2205 DefaultArgumentPromotion(Arg); 2206 TheCall->setArg(i, Arg); 2207 } 2208 } 2209 2210 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2211 if (!Method->isStatic()) 2212 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2213 << Fn->getSourceRange()); 2214 2215 // Do special checking on direct calls to functions. 2216 if (FDecl) 2217 return CheckFunctionCall(FDecl, TheCall.take()); 2218 2219 return Owned(TheCall.take()); 2220} 2221 2222Action::OwningExprResult 2223Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2224 SourceLocation RParenLoc, ExprArg InitExpr) { 2225 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2226 QualType literalType = QualType::getFromOpaquePtr(Ty); 2227 // FIXME: put back this assert when initializers are worked out. 2228 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2229 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2230 2231 if (literalType->isArrayType()) { 2232 if (literalType->isVariableArrayType()) 2233 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2234 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2235 } else if (DiagnoseIncompleteType(LParenLoc, literalType, 2236 diag::err_typecheck_decl_incomplete_type, 2237 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2238 return ExprError(); 2239 2240 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2241 DeclarationName(), /*FIXME:DirectInit=*/false)) 2242 return ExprError(); 2243 2244 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2245 if (isFileScope) { // 6.5.2.5p3 2246 if (CheckForConstantInitializer(literalExpr, literalType)) 2247 return ExprError(); 2248 } 2249 InitExpr.release(); 2250 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2251 literalExpr, isFileScope)); 2252} 2253 2254Action::OwningExprResult 2255Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2256 InitListDesignations &Designators, 2257 SourceLocation RBraceLoc) { 2258 unsigned NumInit = initlist.size(); 2259 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2260 2261 // Semantic analysis for initializers is done by ActOnDeclarator() and 2262 // CheckInitializer() - it requires knowledge of the object being intialized. 2263 2264 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2265 RBraceLoc); 2266 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2267 return Owned(E); 2268} 2269 2270/// CheckCastTypes - Check type constraints for casting between types. 2271bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2272 UsualUnaryConversions(castExpr); 2273 2274 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2275 // type needs to be scalar. 2276 if (castType->isVoidType()) { 2277 // Cast to void allows any expr type. 2278 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2279 // We can't check any more until template instantiation time. 2280 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2281 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2282 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2283 (castType->isStructureType() || castType->isUnionType())) { 2284 // GCC struct/union extension: allow cast to self. 2285 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2286 << castType << castExpr->getSourceRange(); 2287 } else if (castType->isUnionType()) { 2288 // GCC cast to union extension 2289 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2290 RecordDecl::field_iterator Field, FieldEnd; 2291 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 2292 Field != FieldEnd; ++Field) { 2293 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2294 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2295 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2296 << castExpr->getSourceRange(); 2297 break; 2298 } 2299 } 2300 if (Field == FieldEnd) 2301 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2302 << castExpr->getType() << castExpr->getSourceRange(); 2303 } else { 2304 // Reject any other conversions to non-scalar types. 2305 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2306 << castType << castExpr->getSourceRange(); 2307 } 2308 } else if (!castExpr->getType()->isScalarType() && 2309 !castExpr->getType()->isVectorType()) { 2310 return Diag(castExpr->getLocStart(), 2311 diag::err_typecheck_expect_scalar_operand) 2312 << castExpr->getType() << castExpr->getSourceRange(); 2313 } else if (castExpr->getType()->isVectorType()) { 2314 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2315 return true; 2316 } else if (castType->isVectorType()) { 2317 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2318 return true; 2319 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2320 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast); 2321 } 2322 return false; 2323} 2324 2325bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2326 assert(VectorTy->isVectorType() && "Not a vector type!"); 2327 2328 if (Ty->isVectorType() || Ty->isIntegerType()) { 2329 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2330 return Diag(R.getBegin(), 2331 Ty->isVectorType() ? 2332 diag::err_invalid_conversion_between_vectors : 2333 diag::err_invalid_conversion_between_vector_and_integer) 2334 << VectorTy << Ty << R; 2335 } else 2336 return Diag(R.getBegin(), 2337 diag::err_invalid_conversion_between_vector_and_scalar) 2338 << VectorTy << Ty << R; 2339 2340 return false; 2341} 2342 2343Action::OwningExprResult 2344Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2345 SourceLocation RParenLoc, ExprArg Op) { 2346 assert((Ty != 0) && (Op.get() != 0) && 2347 "ActOnCastExpr(): missing type or expr"); 2348 2349 Expr *castExpr = static_cast<Expr*>(Op.release()); 2350 QualType castType = QualType::getFromOpaquePtr(Ty); 2351 2352 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2353 return ExprError(); 2354 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2355 LParenLoc, RParenLoc)); 2356} 2357 2358/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2359/// In that case, lhs = cond. 2360/// C99 6.5.15 2361QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2362 SourceLocation QuestionLoc) { 2363 UsualUnaryConversions(Cond); 2364 UsualUnaryConversions(LHS); 2365 UsualUnaryConversions(RHS); 2366 QualType CondTy = Cond->getType(); 2367 QualType LHSTy = LHS->getType(); 2368 QualType RHSTy = RHS->getType(); 2369 2370 // first, check the condition. 2371 if (!Cond->isTypeDependent()) { 2372 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2373 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2374 << CondTy; 2375 return QualType(); 2376 } 2377 } 2378 2379 // Now check the two expressions. 2380 if ((LHS && LHS->isTypeDependent()) || (RHS && RHS->isTypeDependent())) 2381 return Context.DependentTy; 2382 2383 // If both operands have arithmetic type, do the usual arithmetic conversions 2384 // to find a common type: C99 6.5.15p3,5. 2385 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2386 UsualArithmeticConversions(LHS, RHS); 2387 return LHS->getType(); 2388 } 2389 2390 // If both operands are the same structure or union type, the result is that 2391 // type. 2392 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2393 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2394 if (LHSRT->getDecl() == RHSRT->getDecl()) 2395 // "If both the operands have structure or union type, the result has 2396 // that type." This implies that CV qualifiers are dropped. 2397 return LHSTy.getUnqualifiedType(); 2398 } 2399 2400 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2401 // The following || allows only one side to be void (a GCC-ism). 2402 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2403 if (!LHSTy->isVoidType()) 2404 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2405 << RHS->getSourceRange(); 2406 if (!RHSTy->isVoidType()) 2407 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2408 << LHS->getSourceRange(); 2409 ImpCastExprToType(LHS, Context.VoidTy); 2410 ImpCastExprToType(RHS, Context.VoidTy); 2411 return Context.VoidTy; 2412 } 2413 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2414 // the type of the other operand." 2415 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2416 Context.isObjCObjectPointerType(LHSTy)) && 2417 RHS->isNullPointerConstant(Context)) { 2418 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2419 return LHSTy; 2420 } 2421 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2422 Context.isObjCObjectPointerType(RHSTy)) && 2423 LHS->isNullPointerConstant(Context)) { 2424 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2425 return RHSTy; 2426 } 2427 2428 // Handle the case where both operands are pointers before we handle null 2429 // pointer constants in case both operands are null pointer constants. 2430 if (const PointerType *LHSPT = LHSTy->getAsPointerType()) { // C99 6.5.15p3,6 2431 if (const PointerType *RHSPT = RHSTy->getAsPointerType()) { 2432 // get the "pointed to" types 2433 QualType lhptee = LHSPT->getPointeeType(); 2434 QualType rhptee = RHSPT->getPointeeType(); 2435 2436 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2437 if (lhptee->isVoidType() && 2438 rhptee->isIncompleteOrObjectType()) { 2439 // Figure out necessary qualifiers (C99 6.5.15p6) 2440 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2441 QualType destType = Context.getPointerType(destPointee); 2442 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2443 ImpCastExprToType(RHS, destType); // promote to void* 2444 return destType; 2445 } 2446 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2447 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2448 QualType destType = Context.getPointerType(destPointee); 2449 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2450 ImpCastExprToType(RHS, destType); // promote to void* 2451 return destType; 2452 } 2453 2454 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2455 // Two identical pointer types are always compatible. 2456 return LHSTy; 2457 } 2458 2459 QualType compositeType = LHSTy; 2460 2461 // If either type is an Objective-C object type then check 2462 // compatibility according to Objective-C. 2463 if (Context.isObjCObjectPointerType(LHSTy) || 2464 Context.isObjCObjectPointerType(RHSTy)) { 2465 // If both operands are interfaces and either operand can be 2466 // assigned to the other, use that type as the composite 2467 // type. This allows 2468 // xxx ? (A*) a : (B*) b 2469 // where B is a subclass of A. 2470 // 2471 // Additionally, as for assignment, if either type is 'id' 2472 // allow silent coercion. Finally, if the types are 2473 // incompatible then make sure to use 'id' as the composite 2474 // type so the result is acceptable for sending messages to. 2475 2476 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2477 // It could return the composite type. 2478 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2479 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2480 if (LHSIface && RHSIface && 2481 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2482 compositeType = LHSTy; 2483 } else if (LHSIface && RHSIface && 2484 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2485 compositeType = RHSTy; 2486 } else if (Context.isObjCIdStructType(lhptee) || 2487 Context.isObjCIdStructType(rhptee)) { 2488 compositeType = Context.getObjCIdType(); 2489 } else { 2490 Diag(QuestionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2491 << LHSTy << RHSTy 2492 << LHS->getSourceRange() << RHS->getSourceRange(); 2493 QualType incompatTy = Context.getObjCIdType(); 2494 ImpCastExprToType(LHS, incompatTy); 2495 ImpCastExprToType(RHS, incompatTy); 2496 return incompatTy; 2497 } 2498 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2499 rhptee.getUnqualifiedType())) { 2500 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2501 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2502 // In this situation, we assume void* type. No especially good 2503 // reason, but this is what gcc does, and we do have to pick 2504 // to get a consistent AST. 2505 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2506 ImpCastExprToType(LHS, incompatTy); 2507 ImpCastExprToType(RHS, incompatTy); 2508 return incompatTy; 2509 } 2510 // The pointer types are compatible. 2511 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2512 // differently qualified versions of compatible types, the result type is 2513 // a pointer to an appropriately qualified version of the *composite* 2514 // type. 2515 // FIXME: Need to calculate the composite type. 2516 // FIXME: Need to add qualifiers 2517 ImpCastExprToType(LHS, compositeType); 2518 ImpCastExprToType(RHS, compositeType); 2519 return compositeType; 2520 } 2521 } 2522 2523 // Selection between block pointer types is ok as long as they are the same. 2524 if (LHSTy->isBlockPointerType() && RHSTy->isBlockPointerType() && 2525 Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) 2526 return LHSTy; 2527 2528 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2529 // evaluates to "struct objc_object *" (and is handled above when comparing 2530 // id with statically typed objects). 2531 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 2532 // GCC allows qualified id and any Objective-C type to devolve to 2533 // id. Currently localizing to here until clear this should be 2534 // part of ObjCQualifiedIdTypesAreCompatible. 2535 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 2536 (LHSTy->isObjCQualifiedIdType() && 2537 Context.isObjCObjectPointerType(RHSTy)) || 2538 (RHSTy->isObjCQualifiedIdType() && 2539 Context.isObjCObjectPointerType(LHSTy))) { 2540 // FIXME: This is not the correct composite type. This only 2541 // happens to work because id can more or less be used anywhere, 2542 // however this may change the type of method sends. 2543 // FIXME: gcc adds some type-checking of the arguments and emits 2544 // (confusing) incompatible comparison warnings in some 2545 // cases. Investigate. 2546 QualType compositeType = Context.getObjCIdType(); 2547 ImpCastExprToType(LHS, compositeType); 2548 ImpCastExprToType(RHS, compositeType); 2549 return compositeType; 2550 } 2551 } 2552 2553 // Otherwise, the operands are not compatible. 2554 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2555 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2556 return QualType(); 2557} 2558 2559/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2560/// in the case of a the GNU conditional expr extension. 2561Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2562 SourceLocation ColonLoc, 2563 ExprArg Cond, ExprArg LHS, 2564 ExprArg RHS) { 2565 Expr *CondExpr = (Expr *) Cond.get(); 2566 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2567 2568 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2569 // was the condition. 2570 bool isLHSNull = LHSExpr == 0; 2571 if (isLHSNull) 2572 LHSExpr = CondExpr; 2573 2574 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2575 RHSExpr, QuestionLoc); 2576 if (result.isNull()) 2577 return ExprError(); 2578 2579 Cond.release(); 2580 LHS.release(); 2581 RHS.release(); 2582 return Owned(new (Context) ConditionalOperator(CondExpr, 2583 isLHSNull ? 0 : LHSExpr, 2584 RHSExpr, result)); 2585} 2586 2587 2588// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2589// being closely modeled after the C99 spec:-). The odd characteristic of this 2590// routine is it effectively iqnores the qualifiers on the top level pointee. 2591// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2592// FIXME: add a couple examples in this comment. 2593Sema::AssignConvertType 2594Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2595 QualType lhptee, rhptee; 2596 2597 // get the "pointed to" type (ignoring qualifiers at the top level) 2598 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2599 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2600 2601 // make sure we operate on the canonical type 2602 lhptee = Context.getCanonicalType(lhptee); 2603 rhptee = Context.getCanonicalType(rhptee); 2604 2605 AssignConvertType ConvTy = Compatible; 2606 2607 // C99 6.5.16.1p1: This following citation is common to constraints 2608 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2609 // qualifiers of the type *pointed to* by the right; 2610 // FIXME: Handle ExtQualType 2611 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2612 ConvTy = CompatiblePointerDiscardsQualifiers; 2613 2614 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2615 // incomplete type and the other is a pointer to a qualified or unqualified 2616 // version of void... 2617 if (lhptee->isVoidType()) { 2618 if (rhptee->isIncompleteOrObjectType()) 2619 return ConvTy; 2620 2621 // As an extension, we allow cast to/from void* to function pointer. 2622 assert(rhptee->isFunctionType()); 2623 return FunctionVoidPointer; 2624 } 2625 2626 if (rhptee->isVoidType()) { 2627 if (lhptee->isIncompleteOrObjectType()) 2628 return ConvTy; 2629 2630 // As an extension, we allow cast to/from void* to function pointer. 2631 assert(lhptee->isFunctionType()); 2632 return FunctionVoidPointer; 2633 } 2634 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2635 // unqualified versions of compatible types, ... 2636 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2637 rhptee.getUnqualifiedType())) 2638 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 2639 return ConvTy; 2640} 2641 2642/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2643/// block pointer types are compatible or whether a block and normal pointer 2644/// are compatible. It is more restrict than comparing two function pointer 2645// types. 2646Sema::AssignConvertType 2647Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2648 QualType rhsType) { 2649 QualType lhptee, rhptee; 2650 2651 // get the "pointed to" type (ignoring qualifiers at the top level) 2652 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2653 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2654 2655 // make sure we operate on the canonical type 2656 lhptee = Context.getCanonicalType(lhptee); 2657 rhptee = Context.getCanonicalType(rhptee); 2658 2659 AssignConvertType ConvTy = Compatible; 2660 2661 // For blocks we enforce that qualifiers are identical. 2662 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2663 ConvTy = CompatiblePointerDiscardsQualifiers; 2664 2665 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2666 return IncompatibleBlockPointer; 2667 return ConvTy; 2668} 2669 2670/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2671/// has code to accommodate several GCC extensions when type checking 2672/// pointers. Here are some objectionable examples that GCC considers warnings: 2673/// 2674/// int a, *pint; 2675/// short *pshort; 2676/// struct foo *pfoo; 2677/// 2678/// pint = pshort; // warning: assignment from incompatible pointer type 2679/// a = pint; // warning: assignment makes integer from pointer without a cast 2680/// pint = a; // warning: assignment makes pointer from integer without a cast 2681/// pint = pfoo; // warning: assignment from incompatible pointer type 2682/// 2683/// As a result, the code for dealing with pointers is more complex than the 2684/// C99 spec dictates. 2685/// 2686Sema::AssignConvertType 2687Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2688 // Get canonical types. We're not formatting these types, just comparing 2689 // them. 2690 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2691 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2692 2693 if (lhsType == rhsType) 2694 return Compatible; // Common case: fast path an exact match. 2695 2696 // If the left-hand side is a reference type, then we are in a 2697 // (rare!) case where we've allowed the use of references in C, 2698 // e.g., as a parameter type in a built-in function. In this case, 2699 // just make sure that the type referenced is compatible with the 2700 // right-hand side type. The caller is responsible for adjusting 2701 // lhsType so that the resulting expression does not have reference 2702 // type. 2703 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2704 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2705 return Compatible; 2706 return Incompatible; 2707 } 2708 2709 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 2710 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 2711 return Compatible; 2712 // Relax integer conversions like we do for pointers below. 2713 if (rhsType->isIntegerType()) 2714 return IntToPointer; 2715 if (lhsType->isIntegerType()) 2716 return PointerToInt; 2717 return IncompatibleObjCQualifiedId; 2718 } 2719 2720 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2721 // For ExtVector, allow vector splats; float -> <n x float> 2722 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2723 if (LV->getElementType() == rhsType) 2724 return Compatible; 2725 2726 // If we are allowing lax vector conversions, and LHS and RHS are both 2727 // vectors, the total size only needs to be the same. This is a bitcast; 2728 // no bits are changed but the result type is different. 2729 if (getLangOptions().LaxVectorConversions && 2730 lhsType->isVectorType() && rhsType->isVectorType()) { 2731 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2732 return IncompatibleVectors; 2733 } 2734 return Incompatible; 2735 } 2736 2737 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2738 return Compatible; 2739 2740 if (isa<PointerType>(lhsType)) { 2741 if (rhsType->isIntegerType()) 2742 return IntToPointer; 2743 2744 if (isa<PointerType>(rhsType)) 2745 return CheckPointerTypesForAssignment(lhsType, rhsType); 2746 2747 if (rhsType->getAsBlockPointerType()) { 2748 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2749 return Compatible; 2750 2751 // Treat block pointers as objects. 2752 if (getLangOptions().ObjC1 && 2753 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2754 return Compatible; 2755 } 2756 return Incompatible; 2757 } 2758 2759 if (isa<BlockPointerType>(lhsType)) { 2760 if (rhsType->isIntegerType()) 2761 return IntToBlockPointer; 2762 2763 // Treat block pointers as objects. 2764 if (getLangOptions().ObjC1 && 2765 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2766 return Compatible; 2767 2768 if (rhsType->isBlockPointerType()) 2769 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2770 2771 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2772 if (RHSPT->getPointeeType()->isVoidType()) 2773 return Compatible; 2774 } 2775 return Incompatible; 2776 } 2777 2778 if (isa<PointerType>(rhsType)) { 2779 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2780 if (lhsType == Context.BoolTy) 2781 return Compatible; 2782 2783 if (lhsType->isIntegerType()) 2784 return PointerToInt; 2785 2786 if (isa<PointerType>(lhsType)) 2787 return CheckPointerTypesForAssignment(lhsType, rhsType); 2788 2789 if (isa<BlockPointerType>(lhsType) && 2790 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2791 return Compatible; 2792 return Incompatible; 2793 } 2794 2795 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 2796 if (Context.typesAreCompatible(lhsType, rhsType)) 2797 return Compatible; 2798 } 2799 return Incompatible; 2800} 2801 2802Sema::AssignConvertType 2803Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2804 if (getLangOptions().CPlusPlus) { 2805 if (!lhsType->isRecordType()) { 2806 // C++ 5.17p3: If the left operand is not of class type, the 2807 // expression is implicitly converted (C++ 4) to the 2808 // cv-unqualified type of the left operand. 2809 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 2810 "assigning")) 2811 return Incompatible; 2812 else 2813 return Compatible; 2814 } 2815 2816 // FIXME: Currently, we fall through and treat C++ classes like C 2817 // structures. 2818 } 2819 2820 // C99 6.5.16.1p1: the left operand is a pointer and the right is 2821 // a null pointer constant. 2822 if ((lhsType->isPointerType() || 2823 lhsType->isObjCQualifiedIdType() || 2824 lhsType->isBlockPointerType()) 2825 && rExpr->isNullPointerConstant(Context)) { 2826 ImpCastExprToType(rExpr, lhsType); 2827 return Compatible; 2828 } 2829 2830 // This check seems unnatural, however it is necessary to ensure the proper 2831 // conversion of functions/arrays. If the conversion were done for all 2832 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 2833 // expressions that surpress this implicit conversion (&, sizeof). 2834 // 2835 // Suppress this for references: C++ 8.5.3p5. 2836 if (!lhsType->isReferenceType()) 2837 DefaultFunctionArrayConversion(rExpr); 2838 2839 Sema::AssignConvertType result = 2840 CheckAssignmentConstraints(lhsType, rExpr->getType()); 2841 2842 // C99 6.5.16.1p2: The value of the right operand is converted to the 2843 // type of the assignment expression. 2844 // CheckAssignmentConstraints allows the left-hand side to be a reference, 2845 // so that we can use references in built-in functions even in C. 2846 // The getNonReferenceType() call makes sure that the resulting expression 2847 // does not have reference type. 2848 if (rExpr->getType() != lhsType) 2849 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 2850 return result; 2851} 2852 2853Sema::AssignConvertType 2854Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 2855 return CheckAssignmentConstraints(lhsType, rhsType); 2856} 2857 2858QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 2859 Diag(Loc, diag::err_typecheck_invalid_operands) 2860 << lex->getType() << rex->getType() 2861 << lex->getSourceRange() << rex->getSourceRange(); 2862 return QualType(); 2863} 2864 2865inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 2866 Expr *&rex) { 2867 // For conversion purposes, we ignore any qualifiers. 2868 // For example, "const float" and "float" are equivalent. 2869 QualType lhsType = 2870 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 2871 QualType rhsType = 2872 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 2873 2874 // If the vector types are identical, return. 2875 if (lhsType == rhsType) 2876 return lhsType; 2877 2878 // Handle the case of a vector & extvector type of the same size and element 2879 // type. It would be nice if we only had one vector type someday. 2880 if (getLangOptions().LaxVectorConversions) { 2881 // FIXME: Should we warn here? 2882 if (const VectorType *LV = lhsType->getAsVectorType()) { 2883 if (const VectorType *RV = rhsType->getAsVectorType()) 2884 if (LV->getElementType() == RV->getElementType() && 2885 LV->getNumElements() == RV->getNumElements()) { 2886 return lhsType->isExtVectorType() ? lhsType : rhsType; 2887 } 2888 } 2889 } 2890 2891 // If the lhs is an extended vector and the rhs is a scalar of the same type 2892 // or a literal, promote the rhs to the vector type. 2893 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 2894 QualType eltType = V->getElementType(); 2895 2896 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 2897 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 2898 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 2899 ImpCastExprToType(rex, lhsType); 2900 return lhsType; 2901 } 2902 } 2903 2904 // If the rhs is an extended vector and the lhs is a scalar of the same type, 2905 // promote the lhs to the vector type. 2906 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 2907 QualType eltType = V->getElementType(); 2908 2909 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 2910 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 2911 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 2912 ImpCastExprToType(lex, rhsType); 2913 return rhsType; 2914 } 2915 } 2916 2917 // You cannot convert between vector values of different size. 2918 Diag(Loc, diag::err_typecheck_vector_not_convertable) 2919 << lex->getType() << rex->getType() 2920 << lex->getSourceRange() << rex->getSourceRange(); 2921 return QualType(); 2922} 2923 2924inline QualType Sema::CheckMultiplyDivideOperands( 2925 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2926{ 2927 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2928 return CheckVectorOperands(Loc, lex, rex); 2929 2930 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2931 2932 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2933 return compType; 2934 return InvalidOperands(Loc, lex, rex); 2935} 2936 2937inline QualType Sema::CheckRemainderOperands( 2938 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2939{ 2940 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 2941 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2942 return CheckVectorOperands(Loc, lex, rex); 2943 return InvalidOperands(Loc, lex, rex); 2944 } 2945 2946 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2947 2948 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2949 return compType; 2950 return InvalidOperands(Loc, lex, rex); 2951} 2952 2953inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 2954 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2955{ 2956 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2957 return CheckVectorOperands(Loc, lex, rex); 2958 2959 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2960 2961 // handle the common case first (both operands are arithmetic). 2962 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2963 return compType; 2964 2965 // Put any potential pointer into PExp 2966 Expr* PExp = lex, *IExp = rex; 2967 if (IExp->getType()->isPointerType()) 2968 std::swap(PExp, IExp); 2969 2970 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 2971 if (IExp->getType()->isIntegerType()) { 2972 // Check for arithmetic on pointers to incomplete types 2973 if (!PTy->getPointeeType()->isObjectType()) { 2974 if (PTy->getPointeeType()->isVoidType()) { 2975 if (getLangOptions().CPlusPlus) { 2976 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 2977 << lex->getSourceRange() << rex->getSourceRange(); 2978 return QualType(); 2979 } 2980 2981 // GNU extension: arithmetic on pointer to void 2982 Diag(Loc, diag::ext_gnu_void_ptr) 2983 << lex->getSourceRange() << rex->getSourceRange(); 2984 } else if (PTy->getPointeeType()->isFunctionType()) { 2985 if (getLangOptions().CPlusPlus) { 2986 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 2987 << lex->getType() << lex->getSourceRange(); 2988 return QualType(); 2989 } 2990 2991 // GNU extension: arithmetic on pointer to function 2992 Diag(Loc, diag::ext_gnu_ptr_func_arith) 2993 << lex->getType() << lex->getSourceRange(); 2994 } else { 2995 DiagnoseIncompleteType(Loc, PTy->getPointeeType(), 2996 diag::err_typecheck_arithmetic_incomplete_type, 2997 lex->getSourceRange(), SourceRange(), 2998 lex->getType()); 2999 return QualType(); 3000 } 3001 } 3002 return PExp->getType(); 3003 } 3004 } 3005 3006 return InvalidOperands(Loc, lex, rex); 3007} 3008 3009// C99 6.5.6 3010QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3011 SourceLocation Loc, bool isCompAssign) { 3012 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3013 return CheckVectorOperands(Loc, lex, rex); 3014 3015 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3016 3017 // Enforce type constraints: C99 6.5.6p3. 3018 3019 // Handle the common case first (both operands are arithmetic). 3020 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3021 return compType; 3022 3023 // Either ptr - int or ptr - ptr. 3024 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3025 QualType lpointee = LHSPTy->getPointeeType(); 3026 3027 // The LHS must be an object type, not incomplete, function, etc. 3028 if (!lpointee->isObjectType()) { 3029 // Handle the GNU void* extension. 3030 if (lpointee->isVoidType()) { 3031 Diag(Loc, diag::ext_gnu_void_ptr) 3032 << lex->getSourceRange() << rex->getSourceRange(); 3033 } else if (lpointee->isFunctionType()) { 3034 if (getLangOptions().CPlusPlus) { 3035 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3036 << lex->getType() << lex->getSourceRange(); 3037 return QualType(); 3038 } 3039 3040 // GNU extension: arithmetic on pointer to function 3041 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3042 << lex->getType() << lex->getSourceRange(); 3043 } else { 3044 Diag(Loc, diag::err_typecheck_sub_ptr_object) 3045 << lex->getType() << lex->getSourceRange(); 3046 return QualType(); 3047 } 3048 } 3049 3050 // The result type of a pointer-int computation is the pointer type. 3051 if (rex->getType()->isIntegerType()) 3052 return lex->getType(); 3053 3054 // Handle pointer-pointer subtractions. 3055 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3056 QualType rpointee = RHSPTy->getPointeeType(); 3057 3058 // RHS must be an object type, unless void (GNU). 3059 if (!rpointee->isObjectType()) { 3060 // Handle the GNU void* extension. 3061 if (rpointee->isVoidType()) { 3062 if (!lpointee->isVoidType()) 3063 Diag(Loc, diag::ext_gnu_void_ptr) 3064 << lex->getSourceRange() << rex->getSourceRange(); 3065 } else if (rpointee->isFunctionType()) { 3066 if (getLangOptions().CPlusPlus) { 3067 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3068 << rex->getType() << rex->getSourceRange(); 3069 return QualType(); 3070 } 3071 3072 // GNU extension: arithmetic on pointer to function 3073 if (!lpointee->isFunctionType()) 3074 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3075 << lex->getType() << lex->getSourceRange(); 3076 } else { 3077 Diag(Loc, diag::err_typecheck_sub_ptr_object) 3078 << rex->getType() << rex->getSourceRange(); 3079 return QualType(); 3080 } 3081 } 3082 3083 // Pointee types must be compatible. 3084 if (!Context.typesAreCompatible( 3085 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3086 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3087 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3088 << lex->getType() << rex->getType() 3089 << lex->getSourceRange() << rex->getSourceRange(); 3090 return QualType(); 3091 } 3092 3093 return Context.getPointerDiffType(); 3094 } 3095 } 3096 3097 return InvalidOperands(Loc, lex, rex); 3098} 3099 3100// C99 6.5.7 3101QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3102 bool isCompAssign) { 3103 // C99 6.5.7p2: Each of the operands shall have integer type. 3104 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3105 return InvalidOperands(Loc, lex, rex); 3106 3107 // Shifts don't perform usual arithmetic conversions, they just do integer 3108 // promotions on each operand. C99 6.5.7p3 3109 if (!isCompAssign) 3110 UsualUnaryConversions(lex); 3111 UsualUnaryConversions(rex); 3112 3113 // "The type of the result is that of the promoted left operand." 3114 return lex->getType(); 3115} 3116 3117// C99 6.5.8 3118QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3119 bool isRelational) { 3120 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3121 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3122 3123 // C99 6.5.8p3 / C99 6.5.9p4 3124 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3125 UsualArithmeticConversions(lex, rex); 3126 else { 3127 UsualUnaryConversions(lex); 3128 UsualUnaryConversions(rex); 3129 } 3130 QualType lType = lex->getType(); 3131 QualType rType = rex->getType(); 3132 3133 // For non-floating point types, check for self-comparisons of the form 3134 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3135 // often indicate logic errors in the program. 3136 if (!lType->isFloatingType()) { 3137 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3138 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3139 if (DRL->getDecl() == DRR->getDecl()) 3140 Diag(Loc, diag::warn_selfcomparison); 3141 } 3142 3143 // The result of comparisons is 'bool' in C++, 'int' in C. 3144 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy : Context.IntTy; 3145 3146 if (isRelational) { 3147 if (lType->isRealType() && rType->isRealType()) 3148 return ResultTy; 3149 } else { 3150 // Check for comparisons of floating point operands using != and ==. 3151 if (lType->isFloatingType()) { 3152 assert (rType->isFloatingType()); 3153 CheckFloatComparison(Loc,lex,rex); 3154 } 3155 3156 if (lType->isArithmeticType() && rType->isArithmeticType()) 3157 return ResultTy; 3158 } 3159 3160 bool LHSIsNull = lex->isNullPointerConstant(Context); 3161 bool RHSIsNull = rex->isNullPointerConstant(Context); 3162 3163 // All of the following pointer related warnings are GCC extensions, except 3164 // when handling null pointer constants. One day, we can consider making them 3165 // errors (when -pedantic-errors is enabled). 3166 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3167 QualType LCanPointeeTy = 3168 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3169 QualType RCanPointeeTy = 3170 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3171 3172 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3173 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3174 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3175 RCanPointeeTy.getUnqualifiedType()) && 3176 !Context.areComparableObjCPointerTypes(lType, rType)) { 3177 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3178 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3179 } 3180 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3181 return ResultTy; 3182 } 3183 // Handle block pointer types. 3184 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 3185 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3186 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3187 3188 if (!LHSIsNull && !RHSIsNull && 3189 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3190 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3191 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3192 } 3193 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3194 return ResultTy; 3195 } 3196 // Allow block pointers to be compared with null pointer constants. 3197 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3198 (lType->isPointerType() && rType->isBlockPointerType())) { 3199 if (!LHSIsNull && !RHSIsNull) { 3200 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3201 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3202 } 3203 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3204 return ResultTy; 3205 } 3206 3207 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3208 if (lType->isPointerType() || rType->isPointerType()) { 3209 const PointerType *LPT = lType->getAsPointerType(); 3210 const PointerType *RPT = rType->getAsPointerType(); 3211 bool LPtrToVoid = LPT ? 3212 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3213 bool RPtrToVoid = RPT ? 3214 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3215 3216 if (!LPtrToVoid && !RPtrToVoid && 3217 !Context.typesAreCompatible(lType, rType)) { 3218 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3219 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3220 ImpCastExprToType(rex, lType); 3221 return ResultTy; 3222 } 3223 ImpCastExprToType(rex, lType); 3224 return ResultTy; 3225 } 3226 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3227 ImpCastExprToType(rex, lType); 3228 return ResultTy; 3229 } else { 3230 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3231 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3232 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3233 ImpCastExprToType(rex, lType); 3234 return ResultTy; 3235 } 3236 } 3237 } 3238 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3239 rType->isIntegerType()) { 3240 if (!RHSIsNull) 3241 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3242 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3243 ImpCastExprToType(rex, lType); // promote the integer to pointer 3244 return ResultTy; 3245 } 3246 if (lType->isIntegerType() && 3247 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3248 if (!LHSIsNull) 3249 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3250 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3251 ImpCastExprToType(lex, rType); // promote the integer to pointer 3252 return ResultTy; 3253 } 3254 // Handle block pointers. 3255 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3256 if (!RHSIsNull) 3257 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3258 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3259 ImpCastExprToType(rex, lType); // promote the integer to pointer 3260 return ResultTy; 3261 } 3262 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3263 if (!LHSIsNull) 3264 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3265 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3266 ImpCastExprToType(lex, rType); // promote the integer to pointer 3267 return ResultTy; 3268 } 3269 return InvalidOperands(Loc, lex, rex); 3270} 3271 3272/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3273/// operates on extended vector types. Instead of producing an IntTy result, 3274/// like a scalar comparison, a vector comparison produces a vector of integer 3275/// types. 3276QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3277 SourceLocation Loc, 3278 bool isRelational) { 3279 // Check to make sure we're operating on vectors of the same type and width, 3280 // Allowing one side to be a scalar of element type. 3281 QualType vType = CheckVectorOperands(Loc, lex, rex); 3282 if (vType.isNull()) 3283 return vType; 3284 3285 QualType lType = lex->getType(); 3286 QualType rType = rex->getType(); 3287 3288 // For non-floating point types, check for self-comparisons of the form 3289 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3290 // often indicate logic errors in the program. 3291 if (!lType->isFloatingType()) { 3292 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3293 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3294 if (DRL->getDecl() == DRR->getDecl()) 3295 Diag(Loc, diag::warn_selfcomparison); 3296 } 3297 3298 // Check for comparisons of floating point operands using != and ==. 3299 if (!isRelational && lType->isFloatingType()) { 3300 assert (rType->isFloatingType()); 3301 CheckFloatComparison(Loc,lex,rex); 3302 } 3303 3304 // Return the type for the comparison, which is the same as vector type for 3305 // integer vectors, or an integer type of identical size and number of 3306 // elements for floating point vectors. 3307 if (lType->isIntegerType()) 3308 return lType; 3309 3310 const VectorType *VTy = lType->getAsVectorType(); 3311 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3312 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3313 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3314 else if (TypeSize == Context.getTypeSize(Context.LongTy)) 3315 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3316 3317 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3318 "Unhandled vector element size in vector compare"); 3319 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3320} 3321 3322inline QualType Sema::CheckBitwiseOperands( 3323 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3324{ 3325 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3326 return CheckVectorOperands(Loc, lex, rex); 3327 3328 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3329 3330 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3331 return compType; 3332 return InvalidOperands(Loc, lex, rex); 3333} 3334 3335inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3336 Expr *&lex, Expr *&rex, SourceLocation Loc) 3337{ 3338 UsualUnaryConversions(lex); 3339 UsualUnaryConversions(rex); 3340 3341 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3342 return Context.IntTy; 3343 return InvalidOperands(Loc, lex, rex); 3344} 3345 3346/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3347/// is a read-only property; return true if so. A readonly property expression 3348/// depends on various declarations and thus must be treated specially. 3349/// 3350static bool IsReadonlyProperty(Expr *E, Sema &S) 3351{ 3352 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3353 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3354 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3355 QualType BaseType = PropExpr->getBase()->getType(); 3356 if (const PointerType *PTy = BaseType->getAsPointerType()) 3357 if (const ObjCInterfaceType *IFTy = 3358 PTy->getPointeeType()->getAsObjCInterfaceType()) 3359 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3360 if (S.isPropertyReadonly(PDecl, IFace)) 3361 return true; 3362 } 3363 } 3364 return false; 3365} 3366 3367/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3368/// emit an error and return true. If so, return false. 3369static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3370 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 3371 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3372 IsLV = Expr::MLV_ReadonlyProperty; 3373 if (IsLV == Expr::MLV_Valid) 3374 return false; 3375 3376 unsigned Diag = 0; 3377 bool NeedType = false; 3378 switch (IsLV) { // C99 6.5.16p2 3379 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3380 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3381 case Expr::MLV_ArrayType: 3382 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3383 NeedType = true; 3384 break; 3385 case Expr::MLV_NotObjectType: 3386 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3387 NeedType = true; 3388 break; 3389 case Expr::MLV_LValueCast: 3390 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3391 break; 3392 case Expr::MLV_InvalidExpression: 3393 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3394 break; 3395 case Expr::MLV_IncompleteType: 3396 case Expr::MLV_IncompleteVoidType: 3397 return S.DiagnoseIncompleteType(Loc, E->getType(), 3398 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3399 E->getSourceRange()); 3400 case Expr::MLV_DuplicateVectorComponents: 3401 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 3402 break; 3403 case Expr::MLV_NotBlockQualified: 3404 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 3405 break; 3406 case Expr::MLV_ReadonlyProperty: 3407 Diag = diag::error_readonly_property_assignment; 3408 break; 3409 case Expr::MLV_NoSetterProperty: 3410 Diag = diag::error_nosetter_property_assignment; 3411 break; 3412 } 3413 3414 if (NeedType) 3415 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 3416 else 3417 S.Diag(Loc, Diag) << E->getSourceRange(); 3418 return true; 3419} 3420 3421 3422 3423// C99 6.5.16.1 3424QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 3425 SourceLocation Loc, 3426 QualType CompoundType) { 3427 // Verify that LHS is a modifiable lvalue, and emit error if not. 3428 if (CheckForModifiableLvalue(LHS, Loc, *this)) 3429 return QualType(); 3430 3431 QualType LHSType = LHS->getType(); 3432 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 3433 3434 AssignConvertType ConvTy; 3435 if (CompoundType.isNull()) { 3436 // Simple assignment "x = y". 3437 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 3438 // Special case of NSObject attributes on c-style pointer types. 3439 if (ConvTy == IncompatiblePointer && 3440 ((Context.isObjCNSObjectType(LHSType) && 3441 Context.isObjCObjectPointerType(RHSType)) || 3442 (Context.isObjCNSObjectType(RHSType) && 3443 Context.isObjCObjectPointerType(LHSType)))) 3444 ConvTy = Compatible; 3445 3446 // If the RHS is a unary plus or minus, check to see if they = and + are 3447 // right next to each other. If so, the user may have typo'd "x =+ 4" 3448 // instead of "x += 4". 3449 Expr *RHSCheck = RHS; 3450 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 3451 RHSCheck = ICE->getSubExpr(); 3452 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 3453 if ((UO->getOpcode() == UnaryOperator::Plus || 3454 UO->getOpcode() == UnaryOperator::Minus) && 3455 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 3456 // Only if the two operators are exactly adjacent. 3457 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 3458 Diag(Loc, diag::warn_not_compound_assign) 3459 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 3460 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 3461 } 3462 } else { 3463 // Compound assignment "x += y" 3464 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 3465 } 3466 3467 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 3468 RHS, "assigning")) 3469 return QualType(); 3470 3471 // C99 6.5.16p3: The type of an assignment expression is the type of the 3472 // left operand unless the left operand has qualified type, in which case 3473 // it is the unqualified version of the type of the left operand. 3474 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 3475 // is converted to the type of the assignment expression (above). 3476 // C++ 5.17p1: the type of the assignment expression is that of its left 3477 // oprdu. 3478 return LHSType.getUnqualifiedType(); 3479} 3480 3481// C99 6.5.17 3482QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 3483 // FIXME: what is required for LHS? 3484 3485 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 3486 DefaultFunctionArrayConversion(RHS); 3487 return RHS->getType(); 3488} 3489 3490/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 3491/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 3492QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 3493 bool isInc) { 3494 if (Op->isTypeDependent()) 3495 return Context.DependentTy; 3496 3497 QualType ResType = Op->getType(); 3498 assert(!ResType.isNull() && "no type for increment/decrement expression"); 3499 3500 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 3501 // Decrement of bool is not allowed. 3502 if (!isInc) { 3503 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 3504 return QualType(); 3505 } 3506 // Increment of bool sets it to true, but is deprecated. 3507 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 3508 } else if (ResType->isRealType()) { 3509 // OK! 3510 } else if (const PointerType *PT = ResType->getAsPointerType()) { 3511 // C99 6.5.2.4p2, 6.5.6p2 3512 if (PT->getPointeeType()->isObjectType()) { 3513 // Pointer to object is ok! 3514 } else if (PT->getPointeeType()->isVoidType()) { 3515 if (getLangOptions().CPlusPlus) { 3516 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 3517 << Op->getSourceRange(); 3518 return QualType(); 3519 } 3520 3521 // Pointer to void is a GNU extension in C. 3522 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 3523 } else if (PT->getPointeeType()->isFunctionType()) { 3524 if (getLangOptions().CPlusPlus) { 3525 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 3526 << Op->getType() << Op->getSourceRange(); 3527 return QualType(); 3528 } 3529 3530 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 3531 << ResType << Op->getSourceRange(); 3532 return QualType(); 3533 } else { 3534 DiagnoseIncompleteType(OpLoc, PT->getPointeeType(), 3535 diag::err_typecheck_arithmetic_incomplete_type, 3536 Op->getSourceRange(), SourceRange(), 3537 ResType); 3538 return QualType(); 3539 } 3540 } else if (ResType->isComplexType()) { 3541 // C99 does not support ++/-- on complex types, we allow as an extension. 3542 Diag(OpLoc, diag::ext_integer_increment_complex) 3543 << ResType << Op->getSourceRange(); 3544 } else { 3545 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 3546 << ResType << Op->getSourceRange(); 3547 return QualType(); 3548 } 3549 // At this point, we know we have a real, complex or pointer type. 3550 // Now make sure the operand is a modifiable lvalue. 3551 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 3552 return QualType(); 3553 return ResType; 3554} 3555 3556/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 3557/// This routine allows us to typecheck complex/recursive expressions 3558/// where the declaration is needed for type checking. We only need to 3559/// handle cases when the expression references a function designator 3560/// or is an lvalue. Here are some examples: 3561/// - &(x) => x 3562/// - &*****f => f for f a function designator. 3563/// - &s.xx => s 3564/// - &s.zz[1].yy -> s, if zz is an array 3565/// - *(x + 1) -> x, if x is an array 3566/// - &"123"[2] -> 0 3567/// - & __real__ x -> x 3568static NamedDecl *getPrimaryDecl(Expr *E) { 3569 switch (E->getStmtClass()) { 3570 case Stmt::DeclRefExprClass: 3571 case Stmt::QualifiedDeclRefExprClass: 3572 return cast<DeclRefExpr>(E)->getDecl(); 3573 case Stmt::MemberExprClass: 3574 // Fields cannot be declared with a 'register' storage class. 3575 // &X->f is always ok, even if X is declared register. 3576 if (cast<MemberExpr>(E)->isArrow()) 3577 return 0; 3578 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 3579 case Stmt::ArraySubscriptExprClass: { 3580 // &X[4] and &4[X] refers to X if X is not a pointer. 3581 3582 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 3583 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 3584 if (!VD || VD->getType()->isPointerType()) 3585 return 0; 3586 else 3587 return VD; 3588 } 3589 case Stmt::UnaryOperatorClass: { 3590 UnaryOperator *UO = cast<UnaryOperator>(E); 3591 3592 switch(UO->getOpcode()) { 3593 case UnaryOperator::Deref: { 3594 // *(X + 1) refers to X if X is not a pointer. 3595 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 3596 ValueDecl *VD = dyn_cast<ValueDecl>(D); 3597 if (!VD || VD->getType()->isPointerType()) 3598 return 0; 3599 return VD; 3600 } 3601 return 0; 3602 } 3603 case UnaryOperator::Real: 3604 case UnaryOperator::Imag: 3605 case UnaryOperator::Extension: 3606 return getPrimaryDecl(UO->getSubExpr()); 3607 default: 3608 return 0; 3609 } 3610 } 3611 case Stmt::BinaryOperatorClass: { 3612 BinaryOperator *BO = cast<BinaryOperator>(E); 3613 3614 // Handle cases involving pointer arithmetic. The result of an 3615 // Assign or AddAssign is not an lvalue so they can be ignored. 3616 3617 // (x + n) or (n + x) => x 3618 if (BO->getOpcode() == BinaryOperator::Add) { 3619 if (BO->getLHS()->getType()->isPointerType()) { 3620 return getPrimaryDecl(BO->getLHS()); 3621 } else if (BO->getRHS()->getType()->isPointerType()) { 3622 return getPrimaryDecl(BO->getRHS()); 3623 } 3624 } 3625 3626 return 0; 3627 } 3628 case Stmt::ParenExprClass: 3629 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 3630 case Stmt::ImplicitCastExprClass: 3631 // &X[4] when X is an array, has an implicit cast from array to pointer. 3632 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 3633 default: 3634 return 0; 3635 } 3636} 3637 3638/// CheckAddressOfOperand - The operand of & must be either a function 3639/// designator or an lvalue designating an object. If it is an lvalue, the 3640/// object cannot be declared with storage class register or be a bit field. 3641/// Note: The usual conversions are *not* applied to the operand of the & 3642/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 3643/// In C++, the operand might be an overloaded function name, in which case 3644/// we allow the '&' but retain the overloaded-function type. 3645QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 3646 if (op->isTypeDependent()) 3647 return Context.DependentTy; 3648 3649 if (getLangOptions().C99) { 3650 // Implement C99-only parts of addressof rules. 3651 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 3652 if (uOp->getOpcode() == UnaryOperator::Deref) 3653 // Per C99 6.5.3.2, the address of a deref always returns a valid result 3654 // (assuming the deref expression is valid). 3655 return uOp->getSubExpr()->getType(); 3656 } 3657 // Technically, there should be a check for array subscript 3658 // expressions here, but the result of one is always an lvalue anyway. 3659 } 3660 NamedDecl *dcl = getPrimaryDecl(op); 3661 Expr::isLvalueResult lval = op->isLvalue(Context); 3662 3663 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 3664 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 3665 // FIXME: emit more specific diag... 3666 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 3667 << op->getSourceRange(); 3668 return QualType(); 3669 } 3670 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 3671 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemExpr->getMemberDecl())) { 3672 if (Field->isBitField()) { 3673 Diag(OpLoc, diag::err_typecheck_address_of) 3674 << "bit-field" << op->getSourceRange(); 3675 return QualType(); 3676 } 3677 } 3678 // Check for Apple extension for accessing vector components. 3679 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 3680 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 3681 Diag(OpLoc, diag::err_typecheck_address_of) 3682 << "vector element" << op->getSourceRange(); 3683 return QualType(); 3684 } else if (dcl) { // C99 6.5.3.2p1 3685 // We have an lvalue with a decl. Make sure the decl is not declared 3686 // with the register storage-class specifier. 3687 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 3688 if (vd->getStorageClass() == VarDecl::Register) { 3689 Diag(OpLoc, diag::err_typecheck_address_of) 3690 << "register variable" << op->getSourceRange(); 3691 return QualType(); 3692 } 3693 } else if (isa<OverloadedFunctionDecl>(dcl)) { 3694 return Context.OverloadTy; 3695 } else if (isa<FieldDecl>(dcl)) { 3696 // Okay: we can take the address of a field. 3697 // Could be a pointer to member, though, if there is an explicit 3698 // scope qualifier for the class. 3699 if (isa<QualifiedDeclRefExpr>(op)) { 3700 DeclContext *Ctx = dcl->getDeclContext(); 3701 if (Ctx && Ctx->isRecord()) 3702 return Context.getMemberPointerType(op->getType(), 3703 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3704 } 3705 } else if (isa<FunctionDecl>(dcl)) { 3706 // Okay: we can take the address of a function. 3707 // As above. 3708 if (isa<QualifiedDeclRefExpr>(op)) { 3709 DeclContext *Ctx = dcl->getDeclContext(); 3710 if (Ctx && Ctx->isRecord()) 3711 return Context.getMemberPointerType(op->getType(), 3712 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3713 } 3714 } 3715 else 3716 assert(0 && "Unknown/unexpected decl type"); 3717 } 3718 3719 // If the operand has type "type", the result has type "pointer to type". 3720 return Context.getPointerType(op->getType()); 3721} 3722 3723QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 3724 if (Op->isTypeDependent()) 3725 return Context.DependentTy; 3726 3727 UsualUnaryConversions(Op); 3728 QualType Ty = Op->getType(); 3729 3730 // Note that per both C89 and C99, this is always legal, even if ptype is an 3731 // incomplete type or void. It would be possible to warn about dereferencing 3732 // a void pointer, but it's completely well-defined, and such a warning is 3733 // unlikely to catch any mistakes. 3734 if (const PointerType *PT = Ty->getAsPointerType()) 3735 return PT->getPointeeType(); 3736 3737 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 3738 << Ty << Op->getSourceRange(); 3739 return QualType(); 3740} 3741 3742static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 3743 tok::TokenKind Kind) { 3744 BinaryOperator::Opcode Opc; 3745 switch (Kind) { 3746 default: assert(0 && "Unknown binop!"); 3747 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 3748 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 3749 case tok::star: Opc = BinaryOperator::Mul; break; 3750 case tok::slash: Opc = BinaryOperator::Div; break; 3751 case tok::percent: Opc = BinaryOperator::Rem; break; 3752 case tok::plus: Opc = BinaryOperator::Add; break; 3753 case tok::minus: Opc = BinaryOperator::Sub; break; 3754 case tok::lessless: Opc = BinaryOperator::Shl; break; 3755 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 3756 case tok::lessequal: Opc = BinaryOperator::LE; break; 3757 case tok::less: Opc = BinaryOperator::LT; break; 3758 case tok::greaterequal: Opc = BinaryOperator::GE; break; 3759 case tok::greater: Opc = BinaryOperator::GT; break; 3760 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 3761 case tok::equalequal: Opc = BinaryOperator::EQ; break; 3762 case tok::amp: Opc = BinaryOperator::And; break; 3763 case tok::caret: Opc = BinaryOperator::Xor; break; 3764 case tok::pipe: Opc = BinaryOperator::Or; break; 3765 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 3766 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 3767 case tok::equal: Opc = BinaryOperator::Assign; break; 3768 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 3769 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 3770 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 3771 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 3772 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 3773 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 3774 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 3775 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 3776 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 3777 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 3778 case tok::comma: Opc = BinaryOperator::Comma; break; 3779 } 3780 return Opc; 3781} 3782 3783static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 3784 tok::TokenKind Kind) { 3785 UnaryOperator::Opcode Opc; 3786 switch (Kind) { 3787 default: assert(0 && "Unknown unary op!"); 3788 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 3789 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 3790 case tok::amp: Opc = UnaryOperator::AddrOf; break; 3791 case tok::star: Opc = UnaryOperator::Deref; break; 3792 case tok::plus: Opc = UnaryOperator::Plus; break; 3793 case tok::minus: Opc = UnaryOperator::Minus; break; 3794 case tok::tilde: Opc = UnaryOperator::Not; break; 3795 case tok::exclaim: Opc = UnaryOperator::LNot; break; 3796 case tok::kw___real: Opc = UnaryOperator::Real; break; 3797 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 3798 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 3799 } 3800 return Opc; 3801} 3802 3803/// CreateBuiltinBinOp - Creates a new built-in binary operation with 3804/// operator @p Opc at location @c TokLoc. This routine only supports 3805/// built-in operations; ActOnBinOp handles overloaded operators. 3806Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 3807 unsigned Op, 3808 Expr *lhs, Expr *rhs) { 3809 QualType ResultTy; // Result type of the binary operator. 3810 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 3811 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 3812 3813 switch (Opc) { 3814 default: 3815 assert(0 && "Unknown binary expr!"); 3816 case BinaryOperator::Assign: 3817 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 3818 break; 3819 case BinaryOperator::PtrMemD: 3820 case BinaryOperator::PtrMemI: 3821 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 3822 Opc == BinaryOperator::PtrMemI); 3823 break; 3824 case BinaryOperator::Mul: 3825 case BinaryOperator::Div: 3826 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 3827 break; 3828 case BinaryOperator::Rem: 3829 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 3830 break; 3831 case BinaryOperator::Add: 3832 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 3833 break; 3834 case BinaryOperator::Sub: 3835 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 3836 break; 3837 case BinaryOperator::Shl: 3838 case BinaryOperator::Shr: 3839 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 3840 break; 3841 case BinaryOperator::LE: 3842 case BinaryOperator::LT: 3843 case BinaryOperator::GE: 3844 case BinaryOperator::GT: 3845 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 3846 break; 3847 case BinaryOperator::EQ: 3848 case BinaryOperator::NE: 3849 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 3850 break; 3851 case BinaryOperator::And: 3852 case BinaryOperator::Xor: 3853 case BinaryOperator::Or: 3854 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 3855 break; 3856 case BinaryOperator::LAnd: 3857 case BinaryOperator::LOr: 3858 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 3859 break; 3860 case BinaryOperator::MulAssign: 3861 case BinaryOperator::DivAssign: 3862 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 3863 if (!CompTy.isNull()) 3864 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3865 break; 3866 case BinaryOperator::RemAssign: 3867 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 3868 if (!CompTy.isNull()) 3869 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3870 break; 3871 case BinaryOperator::AddAssign: 3872 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 3873 if (!CompTy.isNull()) 3874 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3875 break; 3876 case BinaryOperator::SubAssign: 3877 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 3878 if (!CompTy.isNull()) 3879 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3880 break; 3881 case BinaryOperator::ShlAssign: 3882 case BinaryOperator::ShrAssign: 3883 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 3884 if (!CompTy.isNull()) 3885 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3886 break; 3887 case BinaryOperator::AndAssign: 3888 case BinaryOperator::XorAssign: 3889 case BinaryOperator::OrAssign: 3890 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 3891 if (!CompTy.isNull()) 3892 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3893 break; 3894 case BinaryOperator::Comma: 3895 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 3896 break; 3897 } 3898 if (ResultTy.isNull()) 3899 return ExprError(); 3900 if (CompTy.isNull()) 3901 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 3902 else 3903 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 3904 CompTy, OpLoc)); 3905} 3906 3907// Binary Operators. 'Tok' is the token for the operator. 3908Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 3909 tok::TokenKind Kind, 3910 ExprArg LHS, ExprArg RHS) { 3911 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 3912 Expr *lhs = (Expr *)LHS.release(), *rhs = (Expr*)RHS.release(); 3913 3914 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 3915 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 3916 3917 // If either expression is type-dependent, just build the AST. 3918 // FIXME: We'll need to perform some caching of the result of name 3919 // lookup for operator+. 3920 if (lhs->isTypeDependent() || rhs->isTypeDependent()) { 3921 if (Opc > BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) 3922 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, 3923 Context.DependentTy, 3924 Context.DependentTy, TokLoc)); 3925 else 3926 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, 3927 Context.DependentTy, TokLoc)); 3928 } 3929 3930 if (getLangOptions().CPlusPlus && Opc != BinaryOperator::PtrMemD && 3931 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 3932 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 3933 // If this is one of the assignment operators, we only perform 3934 // overload resolution if the left-hand side is a class or 3935 // enumeration type (C++ [expr.ass]p3). 3936 if (Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign && 3937 !(lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType())) { 3938 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3939 } 3940 3941 // Determine which overloaded operator we're dealing with. 3942 static const OverloadedOperatorKind OverOps[] = { 3943 // Overloading .* is not possible. 3944 static_cast<OverloadedOperatorKind>(0), OO_ArrowStar, 3945 OO_Star, OO_Slash, OO_Percent, 3946 OO_Plus, OO_Minus, 3947 OO_LessLess, OO_GreaterGreater, 3948 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 3949 OO_EqualEqual, OO_ExclaimEqual, 3950 OO_Amp, 3951 OO_Caret, 3952 OO_Pipe, 3953 OO_AmpAmp, 3954 OO_PipePipe, 3955 OO_Equal, OO_StarEqual, 3956 OO_SlashEqual, OO_PercentEqual, 3957 OO_PlusEqual, OO_MinusEqual, 3958 OO_LessLessEqual, OO_GreaterGreaterEqual, 3959 OO_AmpEqual, OO_CaretEqual, 3960 OO_PipeEqual, 3961 OO_Comma 3962 }; 3963 OverloadedOperatorKind OverOp = OverOps[Opc]; 3964 3965 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3966 // to the candidate set. 3967 OverloadCandidateSet CandidateSet; 3968 Expr *Args[2] = { lhs, rhs }; 3969 if (AddOperatorCandidates(OverOp, S, TokLoc, Args, 2, CandidateSet)) 3970 return ExprError(); 3971 3972 // Perform overload resolution. 3973 OverloadCandidateSet::iterator Best; 3974 switch (BestViableFunction(CandidateSet, Best)) { 3975 case OR_Success: { 3976 // We found a built-in operator or an overloaded operator. 3977 FunctionDecl *FnDecl = Best->Function; 3978 3979 if (FnDecl) { 3980 // We matched an overloaded operator. Build a call to that 3981 // operator. 3982 3983 // Convert the arguments. 3984 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3985 if (PerformObjectArgumentInitialization(lhs, Method) || 3986 PerformCopyInitialization(rhs, FnDecl->getParamDecl(0)->getType(), 3987 "passing")) 3988 return ExprError(); 3989 } else { 3990 // Convert the arguments. 3991 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 3992 "passing") || 3993 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 3994 "passing")) 3995 return ExprError(); 3996 } 3997 3998 // Determine the result type 3999 QualType ResultTy 4000 = FnDecl->getType()->getAsFunctionType()->getResultType(); 4001 ResultTy = ResultTy.getNonReferenceType(); 4002 4003 // Build the actual expression node. 4004 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 4005 SourceLocation()); 4006 UsualUnaryConversions(FnExpr); 4007 4008 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 4009 ResultTy, TokLoc)); 4010 } else { 4011 // We matched a built-in operator. Convert the arguments, then 4012 // break out so that we will build the appropriate built-in 4013 // operator node. 4014 if (PerformImplicitConversion(lhs, Best->BuiltinTypes.ParamTypes[0], 4015 Best->Conversions[0], "passing") || 4016 PerformImplicitConversion(rhs, Best->BuiltinTypes.ParamTypes[1], 4017 Best->Conversions[1], "passing")) 4018 return ExprError(); 4019 4020 break; 4021 } 4022 } 4023 4024 case OR_No_Viable_Function: 4025 // No viable function; fall through to handling this as a 4026 // built-in operator, which will produce an error message for us. 4027 break; 4028 4029 case OR_Ambiguous: 4030 Diag(TokLoc, diag::err_ovl_ambiguous_oper) 4031 << BinaryOperator::getOpcodeStr(Opc) 4032 << lhs->getSourceRange() << rhs->getSourceRange(); 4033 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4034 return ExprError(); 4035 4036 case OR_Deleted: 4037 Diag(TokLoc, diag::err_ovl_deleted_oper) 4038 << Best->Function->isDeleted() 4039 << BinaryOperator::getOpcodeStr(Opc) 4040 << lhs->getSourceRange() << rhs->getSourceRange(); 4041 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4042 return ExprError(); 4043 } 4044 4045 // Either we found no viable overloaded operator or we matched a 4046 // built-in operator. In either case, fall through to trying to 4047 // build a built-in operation. 4048 } 4049 4050 // Build a built-in binary operation. 4051 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4052} 4053 4054// Unary Operators. 'Tok' is the token for the operator. 4055Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4056 tok::TokenKind Op, ExprArg input) { 4057 // FIXME: Input is modified later, but smart pointer not reassigned. 4058 Expr *Input = (Expr*)input.get(); 4059 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4060 4061 if (getLangOptions().CPlusPlus && 4062 (Input->getType()->isRecordType() 4063 || Input->getType()->isEnumeralType())) { 4064 // Determine which overloaded operator we're dealing with. 4065 static const OverloadedOperatorKind OverOps[] = { 4066 OO_None, OO_None, 4067 OO_PlusPlus, OO_MinusMinus, 4068 OO_Amp, OO_Star, 4069 OO_Plus, OO_Minus, 4070 OO_Tilde, OO_Exclaim, 4071 OO_None, OO_None, 4072 OO_None, 4073 OO_None 4074 }; 4075 OverloadedOperatorKind OverOp = OverOps[Opc]; 4076 4077 // Add the appropriate overloaded operators (C++ [over.match.oper]) 4078 // to the candidate set. 4079 OverloadCandidateSet CandidateSet; 4080 if (OverOp != OO_None && 4081 AddOperatorCandidates(OverOp, S, OpLoc, &Input, 1, CandidateSet)) 4082 return ExprError(); 4083 4084 // Perform overload resolution. 4085 OverloadCandidateSet::iterator Best; 4086 switch (BestViableFunction(CandidateSet, Best)) { 4087 case OR_Success: { 4088 // We found a built-in operator or an overloaded operator. 4089 FunctionDecl *FnDecl = Best->Function; 4090 4091 if (FnDecl) { 4092 // We matched an overloaded operator. Build a call to that 4093 // operator. 4094 4095 // Convert the arguments. 4096 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 4097 if (PerformObjectArgumentInitialization(Input, Method)) 4098 return ExprError(); 4099 } else { 4100 // Convert the arguments. 4101 if (PerformCopyInitialization(Input, 4102 FnDecl->getParamDecl(0)->getType(), 4103 "passing")) 4104 return ExprError(); 4105 } 4106 4107 // Determine the result type 4108 QualType ResultTy 4109 = FnDecl->getType()->getAsFunctionType()->getResultType(); 4110 ResultTy = ResultTy.getNonReferenceType(); 4111 4112 // Build the actual expression node. 4113 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 4114 SourceLocation()); 4115 UsualUnaryConversions(FnExpr); 4116 4117 input.release(); 4118 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, &Input, 4119 1, ResultTy, OpLoc)); 4120 } else { 4121 // We matched a built-in operator. Convert the arguments, then 4122 // break out so that we will build the appropriate built-in 4123 // operator node. 4124 if (PerformImplicitConversion(Input, Best->BuiltinTypes.ParamTypes[0], 4125 Best->Conversions[0], "passing")) 4126 return ExprError(); 4127 4128 break; 4129 } 4130 } 4131 4132 case OR_No_Viable_Function: 4133 // No viable function; fall through to handling this as a 4134 // built-in operator, which will produce an error message for us. 4135 break; 4136 4137 case OR_Ambiguous: 4138 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 4139 << UnaryOperator::getOpcodeStr(Opc) 4140 << Input->getSourceRange(); 4141 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4142 return ExprError(); 4143 4144 case OR_Deleted: 4145 Diag(OpLoc, diag::err_ovl_deleted_oper) 4146 << Best->Function->isDeleted() 4147 << UnaryOperator::getOpcodeStr(Opc) 4148 << Input->getSourceRange(); 4149 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4150 return ExprError(); 4151 } 4152 4153 // Either we found no viable overloaded operator or we matched a 4154 // built-in operator. In either case, fall through to trying to 4155 // build a built-in operation. 4156 } 4157 4158 QualType resultType; 4159 switch (Opc) { 4160 default: 4161 assert(0 && "Unimplemented unary expr!"); 4162 case UnaryOperator::PreInc: 4163 case UnaryOperator::PreDec: 4164 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4165 Opc == UnaryOperator::PreInc); 4166 break; 4167 case UnaryOperator::AddrOf: 4168 resultType = CheckAddressOfOperand(Input, OpLoc); 4169 break; 4170 case UnaryOperator::Deref: 4171 DefaultFunctionArrayConversion(Input); 4172 resultType = CheckIndirectionOperand(Input, OpLoc); 4173 break; 4174 case UnaryOperator::Plus: 4175 case UnaryOperator::Minus: 4176 UsualUnaryConversions(Input); 4177 resultType = Input->getType(); 4178 if (resultType->isDependentType()) 4179 break; 4180 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4181 break; 4182 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4183 resultType->isEnumeralType()) 4184 break; 4185 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4186 Opc == UnaryOperator::Plus && 4187 resultType->isPointerType()) 4188 break; 4189 4190 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4191 << resultType << Input->getSourceRange()); 4192 case UnaryOperator::Not: // bitwise complement 4193 UsualUnaryConversions(Input); 4194 resultType = Input->getType(); 4195 if (resultType->isDependentType()) 4196 break; 4197 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4198 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4199 // C99 does not support '~' for complex conjugation. 4200 Diag(OpLoc, diag::ext_integer_complement_complex) 4201 << resultType << Input->getSourceRange(); 4202 else if (!resultType->isIntegerType()) 4203 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4204 << resultType << Input->getSourceRange()); 4205 break; 4206 case UnaryOperator::LNot: // logical negation 4207 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4208 DefaultFunctionArrayConversion(Input); 4209 resultType = Input->getType(); 4210 if (resultType->isDependentType()) 4211 break; 4212 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4213 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4214 << resultType << Input->getSourceRange()); 4215 // LNot always has type int. C99 6.5.3.3p5. 4216 // In C++, it's bool. C++ 5.3.1p8 4217 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4218 break; 4219 case UnaryOperator::Real: 4220 case UnaryOperator::Imag: 4221 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4222 break; 4223 case UnaryOperator::Extension: 4224 resultType = Input->getType(); 4225 break; 4226 } 4227 if (resultType.isNull()) 4228 return ExprError(); 4229 input.release(); 4230 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4231} 4232 4233/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4234Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4235 SourceLocation LabLoc, 4236 IdentifierInfo *LabelII) { 4237 // Look up the record for this label identifier. 4238 llvm::DenseMap<IdentifierInfo*, Action::StmtTy*>::iterator I = 4239 ActiveScope->LabelMap.find(LabelII); 4240 4241 LabelStmt *LabelDecl; 4242 4243 // If we haven't seen this label yet, create a forward reference. It 4244 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4245 if (I == ActiveScope->LabelMap.end()) { 4246 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4247 4248 ActiveScope->LabelMap.insert(std::make_pair(LabelII, LabelDecl)); 4249 } else 4250 LabelDecl = static_cast<LabelStmt *>(I->second); 4251 4252 // Create the AST node. The address of a label always has type 'void*'. 4253 return new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4254 Context.getPointerType(Context.VoidTy)); 4255} 4256 4257Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 4258 SourceLocation RPLoc) { // "({..})" 4259 Stmt *SubStmt = static_cast<Stmt*>(substmt); 4260 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4261 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4262 4263 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4264 if (isFileScope) { 4265 return Diag(LPLoc, diag::err_stmtexpr_file_scope); 4266 } 4267 4268 // FIXME: there are a variety of strange constraints to enforce here, for 4269 // example, it is not possible to goto into a stmt expression apparently. 4270 // More semantic analysis is needed. 4271 4272 // FIXME: the last statement in the compount stmt has its value used. We 4273 // should not warn about it being unused. 4274 4275 // If there are sub stmts in the compound stmt, take the type of the last one 4276 // as the type of the stmtexpr. 4277 QualType Ty = Context.VoidTy; 4278 4279 if (!Compound->body_empty()) { 4280 Stmt *LastStmt = Compound->body_back(); 4281 // If LastStmt is a label, skip down through into the body. 4282 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4283 LastStmt = Label->getSubStmt(); 4284 4285 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4286 Ty = LastExpr->getType(); 4287 } 4288 4289 return new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc); 4290} 4291 4292Sema::ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4293 SourceLocation BuiltinLoc, 4294 SourceLocation TypeLoc, 4295 TypeTy *argty, 4296 OffsetOfComponent *CompPtr, 4297 unsigned NumComponents, 4298 SourceLocation RPLoc) { 4299 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4300 assert(!ArgTy.isNull() && "Missing type argument!"); 4301 4302 bool Dependent = ArgTy->isDependentType(); 4303 4304 // We must have at least one component that refers to the type, and the first 4305 // one is known to be a field designator. Verify that the ArgTy represents 4306 // a struct/union/class. 4307 if (!Dependent && !ArgTy->isRecordType()) 4308 return Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy; 4309 4310 // Otherwise, create a null pointer as the base, and iteratively process 4311 // the offsetof designators. 4312 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4313 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4314 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4315 ArgTy, SourceLocation()); 4316 4317 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4318 // GCC extension, diagnose them. 4319 // FIXME: This diagnostic isn't actually visible because the location is in 4320 // a system header! 4321 if (NumComponents != 1) 4322 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4323 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4324 4325 if (!Dependent) { 4326 // FIXME: Dependent case loses a lot of information here. And probably 4327 // leaks like a sieve. 4328 for (unsigned i = 0; i != NumComponents; ++i) { 4329 const OffsetOfComponent &OC = CompPtr[i]; 4330 if (OC.isBrackets) { 4331 // Offset of an array sub-field. TODO: Should we allow vector elements? 4332 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4333 if (!AT) { 4334 Res->Destroy(Context); 4335 return Diag(OC.LocEnd, diag::err_offsetof_array_type) 4336 << Res->getType(); 4337 } 4338 4339 // FIXME: C++: Verify that operator[] isn't overloaded. 4340 4341 // Promote the array so it looks more like a normal array subscript 4342 // expression. 4343 DefaultFunctionArrayConversion(Res); 4344 4345 // C99 6.5.2.1p1 4346 Expr *Idx = static_cast<Expr*>(OC.U.E); 4347 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4348 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript) 4349 << Idx->getSourceRange(); 4350 4351 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4352 OC.LocEnd); 4353 continue; 4354 } 4355 4356 const RecordType *RC = Res->getType()->getAsRecordType(); 4357 if (!RC) { 4358 Res->Destroy(Context); 4359 return Diag(OC.LocEnd, diag::err_offsetof_record_type) 4360 << Res->getType(); 4361 } 4362 4363 // Get the decl corresponding to this. 4364 RecordDecl *RD = RC->getDecl(); 4365 FieldDecl *MemberDecl 4366 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4367 LookupMemberName) 4368 .getAsDecl()); 4369 if (!MemberDecl) 4370 return Diag(BuiltinLoc, diag::err_typecheck_no_member) 4371 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd); 4372 4373 // FIXME: C++: Verify that MemberDecl isn't a static field. 4374 // FIXME: Verify that MemberDecl isn't a bitfield. 4375 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 4376 // matter here. 4377 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4378 MemberDecl->getType().getNonReferenceType()); 4379 } 4380 } 4381 4382 return new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4383 Context.getSizeType(), BuiltinLoc); 4384} 4385 4386 4387Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4388 TypeTy *arg1, TypeTy *arg2, 4389 SourceLocation RPLoc) { 4390 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4391 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4392 4393 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4394 4395 return new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, 4396 argT2, RPLoc); 4397} 4398 4399Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 4400 ExprTy *expr1, ExprTy *expr2, 4401 SourceLocation RPLoc) { 4402 Expr *CondExpr = static_cast<Expr*>(cond); 4403 Expr *LHSExpr = static_cast<Expr*>(expr1); 4404 Expr *RHSExpr = static_cast<Expr*>(expr2); 4405 4406 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4407 4408 QualType resType; 4409 if (CondExpr->isValueDependent()) { 4410 resType = Context.DependentTy; 4411 } else { 4412 // The conditional expression is required to be a constant expression. 4413 llvm::APSInt condEval(32); 4414 SourceLocation ExpLoc; 4415 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4416 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant) 4417 << CondExpr->getSourceRange(); 4418 4419 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4420 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 4421 } 4422 4423 return new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4424 resType, RPLoc); 4425} 4426 4427//===----------------------------------------------------------------------===// 4428// Clang Extensions. 4429//===----------------------------------------------------------------------===// 4430 4431/// ActOnBlockStart - This callback is invoked when a block literal is started. 4432void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4433 // Analyze block parameters. 4434 BlockSemaInfo *BSI = new BlockSemaInfo(); 4435 4436 // Add BSI to CurBlock. 4437 BSI->PrevBlockInfo = CurBlock; 4438 CurBlock = BSI; 4439 ActiveScope = BlockScope; 4440 4441 BSI->ReturnType = 0; 4442 BSI->TheScope = BlockScope; 4443 BSI->hasBlockDeclRefExprs = false; 4444 4445 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4446 PushDeclContext(BlockScope, BSI->TheDecl); 4447} 4448 4449void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4450 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4451 4452 if (ParamInfo.getNumTypeObjects() == 0 4453 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4454 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4455 4456 // The type is entirely optional as well, if none, use DependentTy. 4457 if (T.isNull()) 4458 T = Context.DependentTy; 4459 4460 // The parameter list is optional, if there was none, assume (). 4461 if (!T->isFunctionType()) 4462 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4463 4464 CurBlock->hasPrototype = true; 4465 CurBlock->isVariadic = false; 4466 Type *RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4467 .getTypePtr(); 4468 4469 if (!RetTy->isDependentType()) 4470 CurBlock->ReturnType = RetTy; 4471 return; 4472 } 4473 4474 // Analyze arguments to block. 4475 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4476 "Not a function declarator!"); 4477 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4478 4479 CurBlock->hasPrototype = FTI.hasPrototype; 4480 CurBlock->isVariadic = true; 4481 4482 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4483 // no arguments, not a function that takes a single void argument. 4484 if (FTI.hasPrototype && 4485 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4486 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 4487 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 4488 // empty arg list, don't push any params. 4489 CurBlock->isVariadic = false; 4490 } else if (FTI.hasPrototype) { 4491 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4492 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 4493 CurBlock->isVariadic = FTI.isVariadic; 4494 QualType T = GetTypeForDeclarator (ParamInfo, CurScope); 4495 4496 Type* RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4497 .getTypePtr(); 4498 4499 if (!RetTy->isDependentType()) 4500 CurBlock->ReturnType = RetTy; 4501 } 4502 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 4503 4504 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4505 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4506 // If this has an identifier, add it to the scope stack. 4507 if ((*AI)->getIdentifier()) 4508 PushOnScopeChains(*AI, CurBlock->TheScope); 4509} 4510 4511/// ActOnBlockError - If there is an error parsing a block, this callback 4512/// is invoked to pop the information about the block from the action impl. 4513void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4514 // Ensure that CurBlock is deleted. 4515 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4516 4517 // Pop off CurBlock, handle nested blocks. 4518 CurBlock = CurBlock->PrevBlockInfo; 4519 4520 // FIXME: Delete the ParmVarDecl objects as well??? 4521 4522} 4523 4524/// ActOnBlockStmtExpr - This is called when the body of a block statement 4525/// literal was successfully completed. ^(int x){...} 4526Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 4527 Scope *CurScope) { 4528 // Ensure that CurBlock is deleted. 4529 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4530 ExprOwningPtr<CompoundStmt> Body(this, static_cast<CompoundStmt*>(body)); 4531 4532 PopDeclContext(); 4533 4534 // Before poping CurBlock, set ActiveScope to this scopes parent. 4535 ActiveScope = CurBlock->TheScope->getParent(); 4536 4537 // Pop off CurBlock, handle nested blocks. 4538 CurBlock = CurBlock->PrevBlockInfo; 4539 4540 QualType RetTy = Context.VoidTy; 4541 if (BSI->ReturnType) 4542 RetTy = QualType(BSI->ReturnType, 0); 4543 4544 llvm::SmallVector<QualType, 8> ArgTypes; 4545 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4546 ArgTypes.push_back(BSI->Params[i]->getType()); 4547 4548 QualType BlockTy; 4549 if (!BSI->hasPrototype) 4550 BlockTy = Context.getFunctionNoProtoType(RetTy); 4551 else 4552 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 4553 BSI->isVariadic, 0); 4554 4555 BlockTy = Context.getBlockPointerType(BlockTy); 4556 4557 BSI->TheDecl->setBody(Body.take()); 4558 return new (Context) BlockExpr(BSI->TheDecl, BlockTy, BSI->hasBlockDeclRefExprs); 4559} 4560 4561Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 4562 ExprTy *expr, TypeTy *type, 4563 SourceLocation RPLoc) { 4564 Expr *E = static_cast<Expr*>(expr); 4565 QualType T = QualType::getFromOpaquePtr(type); 4566 4567 InitBuiltinVaListType(); 4568 4569 // Get the va_list type 4570 QualType VaListType = Context.getBuiltinVaListType(); 4571 // Deal with implicit array decay; for example, on x86-64, 4572 // va_list is an array, but it's supposed to decay to 4573 // a pointer for va_arg. 4574 if (VaListType->isArrayType()) 4575 VaListType = Context.getArrayDecayedType(VaListType); 4576 // Make sure the input expression also decays appropriately. 4577 UsualUnaryConversions(E); 4578 4579 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 4580 return Diag(E->getLocStart(), 4581 diag::err_first_argument_to_va_arg_not_of_type_va_list) 4582 << E->getType() << E->getSourceRange(); 4583 4584 // FIXME: Warn if a non-POD type is passed in. 4585 4586 return new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 4587} 4588 4589Sema::ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 4590 // The type of __null will be int or long, depending on the size of 4591 // pointers on the target. 4592 QualType Ty; 4593 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 4594 Ty = Context.IntTy; 4595 else 4596 Ty = Context.LongTy; 4597 4598 return new (Context) GNUNullExpr(Ty, TokenLoc); 4599} 4600 4601bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 4602 SourceLocation Loc, 4603 QualType DstType, QualType SrcType, 4604 Expr *SrcExpr, const char *Flavor) { 4605 // Decode the result (notice that AST's are still created for extensions). 4606 bool isInvalid = false; 4607 unsigned DiagKind; 4608 switch (ConvTy) { 4609 default: assert(0 && "Unknown conversion type"); 4610 case Compatible: return false; 4611 case PointerToInt: 4612 DiagKind = diag::ext_typecheck_convert_pointer_int; 4613 break; 4614 case IntToPointer: 4615 DiagKind = diag::ext_typecheck_convert_int_pointer; 4616 break; 4617 case IncompatiblePointer: 4618 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 4619 break; 4620 case FunctionVoidPointer: 4621 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 4622 break; 4623 case CompatiblePointerDiscardsQualifiers: 4624 // If the qualifiers lost were because we were applying the 4625 // (deprecated) C++ conversion from a string literal to a char* 4626 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 4627 // Ideally, this check would be performed in 4628 // CheckPointerTypesForAssignment. However, that would require a 4629 // bit of refactoring (so that the second argument is an 4630 // expression, rather than a type), which should be done as part 4631 // of a larger effort to fix CheckPointerTypesForAssignment for 4632 // C++ semantics. 4633 if (getLangOptions().CPlusPlus && 4634 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 4635 return false; 4636 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 4637 break; 4638 case IntToBlockPointer: 4639 DiagKind = diag::err_int_to_block_pointer; 4640 break; 4641 case IncompatibleBlockPointer: 4642 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 4643 break; 4644 case IncompatibleObjCQualifiedId: 4645 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 4646 // it can give a more specific diagnostic. 4647 DiagKind = diag::warn_incompatible_qualified_id; 4648 break; 4649 case IncompatibleVectors: 4650 DiagKind = diag::warn_incompatible_vectors; 4651 break; 4652 case Incompatible: 4653 DiagKind = diag::err_typecheck_convert_incompatible; 4654 isInvalid = true; 4655 break; 4656 } 4657 4658 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 4659 << SrcExpr->getSourceRange(); 4660 return isInvalid; 4661} 4662 4663bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 4664{ 4665 Expr::EvalResult EvalResult; 4666 4667 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 4668 EvalResult.HasSideEffects) { 4669 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 4670 4671 if (EvalResult.Diag) { 4672 // We only show the note if it's not the usual "invalid subexpression" 4673 // or if it's actually in a subexpression. 4674 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 4675 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 4676 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4677 } 4678 4679 return true; 4680 } 4681 4682 if (EvalResult.Diag) { 4683 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 4684 E->getSourceRange(); 4685 4686 // Print the reason it's not a constant. 4687 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4688 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4689 } 4690 4691 if (Result) 4692 *Result = EvalResult.Val.getInt(); 4693 return false; 4694} 4695