SemaExpr.cpp revision 0119fd2f90de3e3b7757dc65936ca1851d7a32b9
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); 179 180 UsualUnaryConversions(rhsExpr); 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 return destType; 203} 204 205QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 206 // Perform the usual unary conversions. We do this early so that 207 // integral promotions to "int" can allow us to exit early, in the 208 // lhs == rhs check. Also, for conversion purposes, we ignore any 209 // qualifiers. For example, "const float" and "float" are 210 // equivalent. 211 if (lhs->isPromotableIntegerType()) 212 lhs = Context.IntTy; 213 else 214 lhs = lhs.getUnqualifiedType(); 215 if (rhs->isPromotableIntegerType()) 216 rhs = Context.IntTy; 217 else 218 rhs = rhs.getUnqualifiedType(); 219 220 // If both types are identical, no conversion is needed. 221 if (lhs == rhs) 222 return lhs; 223 224 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 225 // The caller can deal with this (e.g. pointer + int). 226 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 227 return lhs; 228 229 // At this point, we have two different arithmetic types. 230 231 // Handle complex types first (C99 6.3.1.8p1). 232 if (lhs->isComplexType() || rhs->isComplexType()) { 233 // if we have an integer operand, the result is the complex type. 234 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 235 // convert the rhs to the lhs complex type. 236 return lhs; 237 } 238 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 239 // convert the lhs to the rhs complex type. 240 return rhs; 241 } 242 // This handles complex/complex, complex/float, or float/complex. 243 // When both operands are complex, the shorter operand is converted to the 244 // type of the longer, and that is the type of the result. This corresponds 245 // to what is done when combining two real floating-point operands. 246 // The fun begins when size promotion occur across type domains. 247 // From H&S 6.3.4: When one operand is complex and the other is a real 248 // floating-point type, the less precise type is converted, within it's 249 // real or complex domain, to the precision of the other type. For example, 250 // when combining a "long double" with a "double _Complex", the 251 // "double _Complex" is promoted to "long double _Complex". 252 int result = Context.getFloatingTypeOrder(lhs, rhs); 253 254 if (result > 0) { // The left side is bigger, convert rhs. 255 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 256 } else if (result < 0) { // The right side is bigger, convert lhs. 257 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 258 } 259 // At this point, lhs and rhs have the same rank/size. Now, make sure the 260 // domains match. This is a requirement for our implementation, C99 261 // does not require this promotion. 262 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 263 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 264 return rhs; 265 } else { // handle "_Complex double, double". 266 return lhs; 267 } 268 } 269 return lhs; // The domain/size match exactly. 270 } 271 // Now handle "real" floating types (i.e. float, double, long double). 272 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 273 // if we have an integer operand, the result is the real floating type. 274 if (rhs->isIntegerType()) { 275 // convert rhs to the lhs floating point type. 276 return lhs; 277 } 278 if (rhs->isComplexIntegerType()) { 279 // convert rhs to the complex floating point type. 280 return Context.getComplexType(lhs); 281 } 282 if (lhs->isIntegerType()) { 283 // convert lhs to the rhs floating point type. 284 return rhs; 285 } 286 if (lhs->isComplexIntegerType()) { 287 // convert lhs to the complex floating point type. 288 return Context.getComplexType(rhs); 289 } 290 // We have two real floating types, float/complex combos were handled above. 291 // Convert the smaller operand to the bigger result. 292 int result = Context.getFloatingTypeOrder(lhs, rhs); 293 if (result > 0) // convert the rhs 294 return lhs; 295 assert(result < 0 && "illegal float comparison"); 296 return rhs; // convert the lhs 297 } 298 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 299 // Handle GCC complex int extension. 300 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 301 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 302 303 if (lhsComplexInt && rhsComplexInt) { 304 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 305 rhsComplexInt->getElementType()) >= 0) 306 return lhs; // convert the rhs 307 return rhs; 308 } else if (lhsComplexInt && rhs->isIntegerType()) { 309 // convert the rhs to the lhs complex type. 310 return lhs; 311 } else if (rhsComplexInt && lhs->isIntegerType()) { 312 // convert the lhs to the rhs complex type. 313 return rhs; 314 } 315 } 316 // Finally, we have two differing integer types. 317 // The rules for this case are in C99 6.3.1.8 318 int compare = Context.getIntegerTypeOrder(lhs, rhs); 319 bool lhsSigned = lhs->isSignedIntegerType(), 320 rhsSigned = rhs->isSignedIntegerType(); 321 QualType destType; 322 if (lhsSigned == rhsSigned) { 323 // Same signedness; use the higher-ranked type 324 destType = compare >= 0 ? lhs : rhs; 325 } else if (compare != (lhsSigned ? 1 : -1)) { 326 // The unsigned type has greater than or equal rank to the 327 // signed type, so use the unsigned type 328 destType = lhsSigned ? rhs : lhs; 329 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 330 // The two types are different widths; if we are here, that 331 // means the signed type is larger than the unsigned type, so 332 // use the signed type. 333 destType = lhsSigned ? lhs : rhs; 334 } else { 335 // The signed type is higher-ranked than the unsigned type, 336 // but isn't actually any bigger (like unsigned int and long 337 // on most 32-bit systems). Use the unsigned type corresponding 338 // to the signed type. 339 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 340 } 341 return destType; 342} 343 344//===----------------------------------------------------------------------===// 345// Semantic Analysis for various Expression Types 346//===----------------------------------------------------------------------===// 347 348 349/// ActOnStringLiteral - The specified tokens were lexed as pasted string 350/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 351/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 352/// multiple tokens. However, the common case is that StringToks points to one 353/// string. 354/// 355Action::OwningExprResult 356Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 357 assert(NumStringToks && "Must have at least one string!"); 358 359 StringLiteralParser Literal(StringToks, NumStringToks, PP); 360 if (Literal.hadError) 361 return ExprError(); 362 363 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 364 for (unsigned i = 0; i != NumStringToks; ++i) 365 StringTokLocs.push_back(StringToks[i].getLocation()); 366 367 QualType StrTy = Context.CharTy; 368 if (Literal.AnyWide) StrTy = Context.getWCharType(); 369 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 370 371 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 372 if (getLangOptions().CPlusPlus) 373 StrTy.addConst(); 374 375 // Get an array type for the string, according to C99 6.4.5. This includes 376 // the nul terminator character as well as the string length for pascal 377 // strings. 378 StrTy = Context.getConstantArrayType(StrTy, 379 llvm::APInt(32, Literal.GetNumStringChars()+1), 380 ArrayType::Normal, 0); 381 382 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 383 return Owned(StringLiteral::Create(Context, Literal.GetString(), 384 Literal.GetStringLength(), 385 Literal.AnyWide, StrTy, 386 &StringTokLocs[0], 387 StringTokLocs.size())); 388} 389 390/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 391/// CurBlock to VD should cause it to be snapshotted (as we do for auto 392/// variables defined outside the block) or false if this is not needed (e.g. 393/// for values inside the block or for globals). 394/// 395/// FIXME: This will create BlockDeclRefExprs for global variables, 396/// function references, etc which is suboptimal :) and breaks 397/// things like "integer constant expression" tests. 398static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 399 ValueDecl *VD) { 400 // If the value is defined inside the block, we couldn't snapshot it even if 401 // we wanted to. 402 if (CurBlock->TheDecl == VD->getDeclContext()) 403 return false; 404 405 // If this is an enum constant or function, it is constant, don't snapshot. 406 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 407 return false; 408 409 // If this is a reference to an extern, static, or global variable, no need to 410 // snapshot it. 411 // FIXME: What about 'const' variables in C++? 412 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 413 return Var->hasLocalStorage(); 414 415 return true; 416} 417 418 419 420/// ActOnIdentifierExpr - The parser read an identifier in expression context, 421/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 422/// identifier is used in a function call context. 423/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 424/// class or namespace that the identifier must be a member of. 425Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 426 IdentifierInfo &II, 427 bool HasTrailingLParen, 428 const CXXScopeSpec *SS, 429 bool isAddressOfOperand) { 430 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 431 isAddressOfOperand); 432} 433 434/// BuildDeclRefExpr - Build either a DeclRefExpr or a 435/// QualifiedDeclRefExpr based on whether or not SS is a 436/// nested-name-specifier. 437DeclRefExpr * 438Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 439 bool TypeDependent, bool ValueDependent, 440 const CXXScopeSpec *SS) { 441 if (SS && !SS->isEmpty()) { 442 return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 443 ValueDependent, SS->getRange(), 444 static_cast<NestedNameSpecifier *>(SS->getScopeRep())); 445 } else 446 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 447} 448 449/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 450/// variable corresponding to the anonymous union or struct whose type 451/// is Record. 452static Decl *getObjectForAnonymousRecordDecl(RecordDecl *Record) { 453 assert(Record->isAnonymousStructOrUnion() && 454 "Record must be an anonymous struct or union!"); 455 456 // FIXME: Once Decls are directly linked together, this will 457 // be an O(1) operation rather than a slow walk through DeclContext's 458 // vector (which itself will be eliminated). DeclGroups might make 459 // this even better. 460 DeclContext *Ctx = Record->getDeclContext(); 461 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 462 DEnd = Ctx->decls_end(); 463 D != DEnd; ++D) { 464 if (*D == Record) { 465 // The object for the anonymous struct/union directly 466 // follows its type in the list of declarations. 467 ++D; 468 assert(D != DEnd && "Missing object for anonymous record"); 469 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 470 return *D; 471 } 472 } 473 474 assert(false && "Missing object for anonymous record"); 475 return 0; 476} 477 478Sema::OwningExprResult 479Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 480 FieldDecl *Field, 481 Expr *BaseObjectExpr, 482 SourceLocation OpLoc) { 483 assert(Field->getDeclContext()->isRecord() && 484 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 485 && "Field must be stored inside an anonymous struct or union"); 486 487 // Construct the sequence of field member references 488 // we'll have to perform to get to the field in the anonymous 489 // union/struct. The list of members is built from the field 490 // outward, so traverse it backwards to go from an object in 491 // the current context to the field we found. 492 llvm::SmallVector<FieldDecl *, 4> AnonFields; 493 AnonFields.push_back(Field); 494 VarDecl *BaseObject = 0; 495 DeclContext *Ctx = Field->getDeclContext(); 496 do { 497 RecordDecl *Record = cast<RecordDecl>(Ctx); 498 Decl *AnonObject = getObjectForAnonymousRecordDecl(Record); 499 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 500 AnonFields.push_back(AnonField); 501 else { 502 BaseObject = cast<VarDecl>(AnonObject); 503 break; 504 } 505 Ctx = Ctx->getParent(); 506 } while (Ctx->isRecord() && 507 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 508 509 // Build the expression that refers to the base object, from 510 // which we will build a sequence of member references to each 511 // of the anonymous union objects and, eventually, the field we 512 // found via name lookup. 513 bool BaseObjectIsPointer = false; 514 unsigned ExtraQuals = 0; 515 if (BaseObject) { 516 // BaseObject is an anonymous struct/union variable (and is, 517 // therefore, not part of another non-anonymous record). 518 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 519 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 520 SourceLocation()); 521 ExtraQuals 522 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 523 } else if (BaseObjectExpr) { 524 // The caller provided the base object expression. Determine 525 // whether its a pointer and whether it adds any qualifiers to the 526 // anonymous struct/union fields we're looking into. 527 QualType ObjectType = BaseObjectExpr->getType(); 528 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 529 BaseObjectIsPointer = true; 530 ObjectType = ObjectPtr->getPointeeType(); 531 } 532 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 533 } else { 534 // We've found a member of an anonymous struct/union that is 535 // inside a non-anonymous struct/union, so in a well-formed 536 // program our base object expression is "this". 537 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 538 if (!MD->isStatic()) { 539 QualType AnonFieldType 540 = Context.getTagDeclType( 541 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 542 QualType ThisType = Context.getTagDeclType(MD->getParent()); 543 if ((Context.getCanonicalType(AnonFieldType) 544 == Context.getCanonicalType(ThisType)) || 545 IsDerivedFrom(ThisType, AnonFieldType)) { 546 // Our base object expression is "this". 547 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 548 MD->getThisType(Context)); 549 BaseObjectIsPointer = true; 550 } 551 } else { 552 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 553 << Field->getDeclName()); 554 } 555 ExtraQuals = MD->getTypeQualifiers(); 556 } 557 558 if (!BaseObjectExpr) 559 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 560 << Field->getDeclName()); 561 } 562 563 // Build the implicit member references to the field of the 564 // anonymous struct/union. 565 Expr *Result = BaseObjectExpr; 566 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 567 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 568 FI != FIEnd; ++FI) { 569 QualType MemberType = (*FI)->getType(); 570 if (!(*FI)->isMutable()) { 571 unsigned combinedQualifiers 572 = MemberType.getCVRQualifiers() | ExtraQuals; 573 MemberType = MemberType.getQualifiedType(combinedQualifiers); 574 } 575 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 576 OpLoc, MemberType); 577 BaseObjectIsPointer = false; 578 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 579 } 580 581 return Owned(Result); 582} 583 584/// ActOnDeclarationNameExpr - The parser has read some kind of name 585/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 586/// performs lookup on that name and returns an expression that refers 587/// to that name. This routine isn't directly called from the parser, 588/// because the parser doesn't know about DeclarationName. Rather, 589/// this routine is called by ActOnIdentifierExpr, 590/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 591/// which form the DeclarationName from the corresponding syntactic 592/// forms. 593/// 594/// HasTrailingLParen indicates whether this identifier is used in a 595/// function call context. LookupCtx is only used for a C++ 596/// qualified-id (foo::bar) to indicate the class or namespace that 597/// the identifier must be a member of. 598/// 599/// isAddressOfOperand means that this expression is the direct operand 600/// of an address-of operator. This matters because this is the only 601/// situation where a qualified name referencing a non-static member may 602/// appear outside a member function of this class. 603Sema::OwningExprResult 604Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 605 DeclarationName Name, bool HasTrailingLParen, 606 const CXXScopeSpec *SS, 607 bool isAddressOfOperand) { 608 // Could be enum-constant, value decl, instance variable, etc. 609 if (SS && SS->isInvalid()) 610 return ExprError(); 611 612 // C++ [temp.dep.expr]p3: 613 // An id-expression is type-dependent if it contains: 614 // -- a nested-name-specifier that contains a class-name that 615 // names a dependent type. 616 if (SS && isDependentScopeSpecifier(*SS)) { 617 return Owned(new (Context) UnresolvedDeclRefExpr(Name, Context.DependentTy, 618 Loc, SS->getRange(), 619 static_cast<NestedNameSpecifier *>(SS->getScopeRep()))); 620 } 621 622 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 623 false, true, Loc); 624 625 NamedDecl *D = 0; 626 if (Lookup.isAmbiguous()) { 627 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 628 SS && SS->isSet() ? SS->getRange() 629 : SourceRange()); 630 return ExprError(); 631 } else 632 D = Lookup.getAsDecl(); 633 634 // If this reference is in an Objective-C method, then ivar lookup happens as 635 // well. 636 IdentifierInfo *II = Name.getAsIdentifierInfo(); 637 if (II && getCurMethodDecl()) { 638 // There are two cases to handle here. 1) scoped lookup could have failed, 639 // in which case we should look for an ivar. 2) scoped lookup could have 640 // found a decl, but that decl is outside the current instance method (i.e. 641 // a global variable). In these two cases, we do a lookup for an ivar with 642 // this name, if the lookup sucedes, we replace it our current decl. 643 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 644 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 645 ObjCInterfaceDecl *ClassDeclared; 646 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 647 // Check if referencing a field with __attribute__((deprecated)). 648 if (DiagnoseUseOfDecl(IV, Loc)) 649 return ExprError(); 650 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 651 // If a class method attemps to use a free standing ivar, this is 652 // an error. 653 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 654 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 655 << IV->getDeclName()); 656 // If a class method uses a global variable, even if an ivar with 657 // same name exists, use the global. 658 if (!IsClsMethod) { 659 if (IV->getAccessControl() == ObjCIvarDecl::Private && 660 ClassDeclared != IFace) 661 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 662 // FIXME: This should use a new expr for a direct reference, don't turn 663 // this into Self->ivar, just return a BareIVarExpr or something. 664 IdentifierInfo &II = Context.Idents.get("self"); 665 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 666 ObjCIvarRefExpr *MRef = new (Context) ObjCIvarRefExpr(IV, IV->getType(), 667 Loc, static_cast<Expr*>(SelfExpr.release()), 668 true, true); 669 Context.setFieldDecl(IFace, IV, MRef); 670 return Owned(MRef); 671 } 672 } 673 } 674 else if (getCurMethodDecl()->isInstanceMethod()) { 675 // We should warn if a local variable hides an ivar. 676 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 677 ObjCInterfaceDecl *ClassDeclared; 678 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 679 if (IV->getAccessControl() != ObjCIvarDecl::Private || 680 IFace == ClassDeclared) 681 Diag(Loc, diag::warn_ivar_use_hidden)<<IV->getDeclName(); 682 } 683 } 684 // Needed to implement property "super.method" notation. 685 if (D == 0 && II->isStr("super")) { 686 QualType T; 687 688 if (getCurMethodDecl()->isInstanceMethod()) 689 T = Context.getPointerType(Context.getObjCInterfaceType( 690 getCurMethodDecl()->getClassInterface())); 691 else 692 T = Context.getObjCClassType(); 693 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 694 } 695 } 696 697 // Determine whether this name might be a candidate for 698 // argument-dependent lookup. 699 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 700 HasTrailingLParen; 701 702 if (ADL && D == 0) { 703 // We've seen something of the form 704 // 705 // identifier( 706 // 707 // and we did not find any entity by the name 708 // "identifier". However, this identifier is still subject to 709 // argument-dependent lookup, so keep track of the name. 710 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 711 Context.OverloadTy, 712 Loc)); 713 } 714 715 if (D == 0) { 716 // Otherwise, this could be an implicitly declared function reference (legal 717 // in C90, extension in C99). 718 if (HasTrailingLParen && II && 719 !getLangOptions().CPlusPlus) // Not in C++. 720 D = ImplicitlyDefineFunction(Loc, *II, S); 721 else { 722 // If this name wasn't predeclared and if this is not a function call, 723 // diagnose the problem. 724 if (SS && !SS->isEmpty()) 725 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 726 << Name << SS->getRange()); 727 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 728 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 729 return ExprError(Diag(Loc, diag::err_undeclared_use) 730 << Name.getAsString()); 731 else 732 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 733 } 734 } 735 736 // If this is an expression of the form &Class::member, don't build an 737 // implicit member ref, because we want a pointer to the member in general, 738 // not any specific instance's member. 739 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 740 DeclContext *DC = computeDeclContext(*SS); 741 if (D && isa<CXXRecordDecl>(DC)) { 742 QualType DType; 743 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 744 DType = FD->getType().getNonReferenceType(); 745 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 746 DType = Method->getType(); 747 } else if (isa<OverloadedFunctionDecl>(D)) { 748 DType = Context.OverloadTy; 749 } 750 // Could be an inner type. That's diagnosed below, so ignore it here. 751 if (!DType.isNull()) { 752 // The pointer is type- and value-dependent if it points into something 753 // dependent. 754 bool Dependent = false; 755 for (; DC; DC = DC->getParent()) { 756 // FIXME: could stop early at namespace scope. 757 if (DC->isRecord()) { 758 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 759 if (Context.getTypeDeclType(Record)->isDependentType()) { 760 Dependent = true; 761 break; 762 } 763 } 764 } 765 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 766 } 767 } 768 } 769 770 // We may have found a field within an anonymous union or struct 771 // (C++ [class.union]). 772 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 773 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 774 return BuildAnonymousStructUnionMemberReference(Loc, FD); 775 776 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 777 if (!MD->isStatic()) { 778 // C++ [class.mfct.nonstatic]p2: 779 // [...] if name lookup (3.4.1) resolves the name in the 780 // id-expression to a nonstatic nontype member of class X or of 781 // a base class of X, the id-expression is transformed into a 782 // class member access expression (5.2.5) using (*this) (9.3.2) 783 // as the postfix-expression to the left of the '.' operator. 784 DeclContext *Ctx = 0; 785 QualType MemberType; 786 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 787 Ctx = FD->getDeclContext(); 788 MemberType = FD->getType(); 789 790 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 791 MemberType = RefType->getPointeeType(); 792 else if (!FD->isMutable()) { 793 unsigned combinedQualifiers 794 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 795 MemberType = MemberType.getQualifiedType(combinedQualifiers); 796 } 797 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 798 if (!Method->isStatic()) { 799 Ctx = Method->getParent(); 800 MemberType = Method->getType(); 801 } 802 } else if (OverloadedFunctionDecl *Ovl 803 = dyn_cast<OverloadedFunctionDecl>(D)) { 804 for (OverloadedFunctionDecl::function_iterator 805 Func = Ovl->function_begin(), 806 FuncEnd = Ovl->function_end(); 807 Func != FuncEnd; ++Func) { 808 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 809 if (!DMethod->isStatic()) { 810 Ctx = Ovl->getDeclContext(); 811 MemberType = Context.OverloadTy; 812 break; 813 } 814 } 815 } 816 817 if (Ctx && Ctx->isRecord()) { 818 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 819 QualType ThisType = Context.getTagDeclType(MD->getParent()); 820 if ((Context.getCanonicalType(CtxType) 821 == Context.getCanonicalType(ThisType)) || 822 IsDerivedFrom(ThisType, CtxType)) { 823 // Build the implicit member access expression. 824 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 825 MD->getThisType(Context)); 826 return Owned(new (Context) MemberExpr(This, true, D, 827 SourceLocation(), MemberType)); 828 } 829 } 830 } 831 } 832 833 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 834 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 835 if (MD->isStatic()) 836 // "invalid use of member 'x' in static member function" 837 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 838 << FD->getDeclName()); 839 } 840 841 // Any other ways we could have found the field in a well-formed 842 // program would have been turned into implicit member expressions 843 // above. 844 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 845 << FD->getDeclName()); 846 } 847 848 if (isa<TypedefDecl>(D)) 849 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 850 if (isa<ObjCInterfaceDecl>(D)) 851 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 852 if (isa<NamespaceDecl>(D)) 853 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 854 855 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 856 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 857 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 858 false, false, SS)); 859 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 860 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 861 false, false, SS)); 862 ValueDecl *VD = cast<ValueDecl>(D); 863 864 // Check whether this declaration can be used. Note that we suppress 865 // this check when we're going to perform argument-dependent lookup 866 // on this function name, because this might not be the function 867 // that overload resolution actually selects. 868 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 869 return ExprError(); 870 871 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 872 // Warn about constructs like: 873 // if (void *X = foo()) { ... } else { X }. 874 // In the else block, the pointer is always false. 875 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 876 Scope *CheckS = S; 877 while (CheckS) { 878 if (CheckS->isWithinElse() && 879 CheckS->getControlParent()->isDeclScope(DeclPtrTy::make(Var))) { 880 if (Var->getType()->isBooleanType()) 881 ExprError(Diag(Loc, diag::warn_value_always_false) 882 << Var->getDeclName()); 883 else 884 ExprError(Diag(Loc, diag::warn_value_always_zero) 885 << Var->getDeclName()); 886 break; 887 } 888 889 // Move up one more control parent to check again. 890 CheckS = CheckS->getControlParent(); 891 if (CheckS) 892 CheckS = CheckS->getParent(); 893 } 894 } 895 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 896 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 897 // C99 DR 316 says that, if a function type comes from a 898 // function definition (without a prototype), that type is only 899 // used for checking compatibility. Therefore, when referencing 900 // the function, we pretend that we don't have the full function 901 // type. 902 QualType T = Func->getType(); 903 QualType NoProtoType = T; 904 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 905 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 906 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 907 } 908 } 909 910 // Only create DeclRefExpr's for valid Decl's. 911 if (VD->isInvalidDecl()) 912 return ExprError(); 913 914 // If the identifier reference is inside a block, and it refers to a value 915 // that is outside the block, create a BlockDeclRefExpr instead of a 916 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 917 // the block is formed. 918 // 919 // We do not do this for things like enum constants, global variables, etc, 920 // as they do not get snapshotted. 921 // 922 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 923 // Blocks that have these can't be constant. 924 CurBlock->hasBlockDeclRefExprs = true; 925 926 QualType ExprTy = VD->getType().getNonReferenceType(); 927 // The BlocksAttr indicates the variable is bound by-reference. 928 if (VD->getAttr<BlocksAttr>()) 929 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 930 931 // Variable will be bound by-copy, make it const within the closure. 932 ExprTy.addConst(); 933 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false)); 934 } 935 // If this reference is not in a block or if the referenced variable is 936 // within the block, create a normal DeclRefExpr. 937 938 bool TypeDependent = false; 939 bool ValueDependent = false; 940 if (getLangOptions().CPlusPlus) { 941 // C++ [temp.dep.expr]p3: 942 // An id-expression is type-dependent if it contains: 943 // - an identifier that was declared with a dependent type, 944 if (VD->getType()->isDependentType()) 945 TypeDependent = true; 946 // - FIXME: a template-id that is dependent, 947 // - a conversion-function-id that specifies a dependent type, 948 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 949 Name.getCXXNameType()->isDependentType()) 950 TypeDependent = true; 951 // - a nested-name-specifier that contains a class-name that 952 // names a dependent type. 953 else if (SS && !SS->isEmpty()) { 954 for (DeclContext *DC = computeDeclContext(*SS); 955 DC; DC = DC->getParent()) { 956 // FIXME: could stop early at namespace scope. 957 if (DC->isRecord()) { 958 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 959 if (Context.getTypeDeclType(Record)->isDependentType()) { 960 TypeDependent = true; 961 break; 962 } 963 } 964 } 965 } 966 967 // C++ [temp.dep.constexpr]p2: 968 // 969 // An identifier is value-dependent if it is: 970 // - a name declared with a dependent type, 971 if (TypeDependent) 972 ValueDependent = true; 973 // - the name of a non-type template parameter, 974 else if (isa<NonTypeTemplateParmDecl>(VD)) 975 ValueDependent = true; 976 // - a constant with integral or enumeration type and is 977 // initialized with an expression that is value-dependent 978 // (FIXME!). 979 } 980 981 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 982 TypeDependent, ValueDependent, SS)); 983} 984 985Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 986 tok::TokenKind Kind) { 987 PredefinedExpr::IdentType IT; 988 989 switch (Kind) { 990 default: assert(0 && "Unknown simple primary expr!"); 991 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 992 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 993 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 994 } 995 996 // Pre-defined identifiers are of type char[x], where x is the length of the 997 // string. 998 unsigned Length; 999 if (FunctionDecl *FD = getCurFunctionDecl()) 1000 Length = FD->getIdentifier()->getLength(); 1001 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1002 Length = MD->getSynthesizedMethodSize(); 1003 else { 1004 Diag(Loc, diag::ext_predef_outside_function); 1005 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1006 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1007 } 1008 1009 1010 llvm::APInt LengthI(32, Length + 1); 1011 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1012 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1013 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1014} 1015 1016Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1017 llvm::SmallString<16> CharBuffer; 1018 CharBuffer.resize(Tok.getLength()); 1019 const char *ThisTokBegin = &CharBuffer[0]; 1020 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1021 1022 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1023 Tok.getLocation(), PP); 1024 if (Literal.hadError()) 1025 return ExprError(); 1026 1027 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1028 1029 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1030 Literal.isWide(), 1031 type, Tok.getLocation())); 1032} 1033 1034Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1035 // Fast path for a single digit (which is quite common). A single digit 1036 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1037 if (Tok.getLength() == 1) { 1038 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1039 unsigned IntSize = Context.Target.getIntWidth(); 1040 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1041 Context.IntTy, Tok.getLocation())); 1042 } 1043 1044 llvm::SmallString<512> IntegerBuffer; 1045 // Add padding so that NumericLiteralParser can overread by one character. 1046 IntegerBuffer.resize(Tok.getLength()+1); 1047 const char *ThisTokBegin = &IntegerBuffer[0]; 1048 1049 // Get the spelling of the token, which eliminates trigraphs, etc. 1050 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1051 1052 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1053 Tok.getLocation(), PP); 1054 if (Literal.hadError) 1055 return ExprError(); 1056 1057 Expr *Res; 1058 1059 if (Literal.isFloatingLiteral()) { 1060 QualType Ty; 1061 if (Literal.isFloat) 1062 Ty = Context.FloatTy; 1063 else if (!Literal.isLong) 1064 Ty = Context.DoubleTy; 1065 else 1066 Ty = Context.LongDoubleTy; 1067 1068 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1069 1070 // isExact will be set by GetFloatValue(). 1071 bool isExact = false; 1072 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1073 &isExact, Ty, Tok.getLocation()); 1074 1075 } else if (!Literal.isIntegerLiteral()) { 1076 return ExprError(); 1077 } else { 1078 QualType Ty; 1079 1080 // long long is a C99 feature. 1081 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1082 Literal.isLongLong) 1083 Diag(Tok.getLocation(), diag::ext_longlong); 1084 1085 // Get the value in the widest-possible width. 1086 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1087 1088 if (Literal.GetIntegerValue(ResultVal)) { 1089 // If this value didn't fit into uintmax_t, warn and force to ull. 1090 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1091 Ty = Context.UnsignedLongLongTy; 1092 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1093 "long long is not intmax_t?"); 1094 } else { 1095 // If this value fits into a ULL, try to figure out what else it fits into 1096 // according to the rules of C99 6.4.4.1p5. 1097 1098 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1099 // be an unsigned int. 1100 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1101 1102 // Check from smallest to largest, picking the smallest type we can. 1103 unsigned Width = 0; 1104 if (!Literal.isLong && !Literal.isLongLong) { 1105 // Are int/unsigned possibilities? 1106 unsigned IntSize = Context.Target.getIntWidth(); 1107 1108 // Does it fit in a unsigned int? 1109 if (ResultVal.isIntN(IntSize)) { 1110 // Does it fit in a signed int? 1111 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1112 Ty = Context.IntTy; 1113 else if (AllowUnsigned) 1114 Ty = Context.UnsignedIntTy; 1115 Width = IntSize; 1116 } 1117 } 1118 1119 // Are long/unsigned long possibilities? 1120 if (Ty.isNull() && !Literal.isLongLong) { 1121 unsigned LongSize = Context.Target.getLongWidth(); 1122 1123 // Does it fit in a unsigned long? 1124 if (ResultVal.isIntN(LongSize)) { 1125 // Does it fit in a signed long? 1126 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1127 Ty = Context.LongTy; 1128 else if (AllowUnsigned) 1129 Ty = Context.UnsignedLongTy; 1130 Width = LongSize; 1131 } 1132 } 1133 1134 // Finally, check long long if needed. 1135 if (Ty.isNull()) { 1136 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1137 1138 // Does it fit in a unsigned long long? 1139 if (ResultVal.isIntN(LongLongSize)) { 1140 // Does it fit in a signed long long? 1141 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1142 Ty = Context.LongLongTy; 1143 else if (AllowUnsigned) 1144 Ty = Context.UnsignedLongLongTy; 1145 Width = LongLongSize; 1146 } 1147 } 1148 1149 // If we still couldn't decide a type, we probably have something that 1150 // does not fit in a signed long long, but has no U suffix. 1151 if (Ty.isNull()) { 1152 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1153 Ty = Context.UnsignedLongLongTy; 1154 Width = Context.Target.getLongLongWidth(); 1155 } 1156 1157 if (ResultVal.getBitWidth() != Width) 1158 ResultVal.trunc(Width); 1159 } 1160 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1161 } 1162 1163 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1164 if (Literal.isImaginary) 1165 Res = new (Context) ImaginaryLiteral(Res, 1166 Context.getComplexType(Res->getType())); 1167 1168 return Owned(Res); 1169} 1170 1171Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1172 SourceLocation R, ExprArg Val) { 1173 Expr *E = (Expr *)Val.release(); 1174 assert((E != 0) && "ActOnParenExpr() missing expr"); 1175 return Owned(new (Context) ParenExpr(L, R, E)); 1176} 1177 1178/// The UsualUnaryConversions() function is *not* called by this routine. 1179/// See C99 6.3.2.1p[2-4] for more details. 1180bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1181 SourceLocation OpLoc, 1182 const SourceRange &ExprRange, 1183 bool isSizeof) { 1184 if (exprType->isDependentType()) 1185 return false; 1186 1187 // C99 6.5.3.4p1: 1188 if (isa<FunctionType>(exprType)) { 1189 // alignof(function) is allowed. 1190 if (isSizeof) 1191 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1192 return false; 1193 } 1194 1195 if (exprType->isVoidType()) { 1196 Diag(OpLoc, diag::ext_sizeof_void_type) 1197 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1198 return false; 1199 } 1200 1201 return RequireCompleteType(OpLoc, exprType, 1202 isSizeof ? diag::err_sizeof_incomplete_type : 1203 diag::err_alignof_incomplete_type, 1204 ExprRange); 1205} 1206 1207bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1208 const SourceRange &ExprRange) { 1209 E = E->IgnoreParens(); 1210 1211 // alignof decl is always ok. 1212 if (isa<DeclRefExpr>(E)) 1213 return false; 1214 1215 // Cannot know anything else if the expression is dependent. 1216 if (E->isTypeDependent()) 1217 return false; 1218 1219 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1220 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { 1221 if (FD->isBitField()) { 1222 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1223 return true; 1224 } 1225 // Other fields are ok. 1226 return false; 1227 } 1228 } 1229 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1230} 1231 1232/// \brief Build a sizeof or alignof expression given a type operand. 1233Action::OwningExprResult 1234Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1235 bool isSizeOf, SourceRange R) { 1236 if (T.isNull()) 1237 return ExprError(); 1238 1239 if (!T->isDependentType() && 1240 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1241 return ExprError(); 1242 1243 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1244 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1245 Context.getSizeType(), OpLoc, 1246 R.getEnd())); 1247} 1248 1249/// \brief Build a sizeof or alignof expression given an expression 1250/// operand. 1251Action::OwningExprResult 1252Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1253 bool isSizeOf, SourceRange R) { 1254 // Verify that the operand is valid. 1255 bool isInvalid = false; 1256 if (E->isTypeDependent()) { 1257 // Delay type-checking for type-dependent expressions. 1258 } else if (!isSizeOf) { 1259 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1260 } else if (E->isBitField()) { // C99 6.5.3.4p1. 1261 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1262 isInvalid = true; 1263 } else { 1264 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1265 } 1266 1267 if (isInvalid) 1268 return ExprError(); 1269 1270 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1271 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1272 Context.getSizeType(), OpLoc, 1273 R.getEnd())); 1274} 1275 1276/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1277/// the same for @c alignof and @c __alignof 1278/// Note that the ArgRange is invalid if isType is false. 1279Action::OwningExprResult 1280Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1281 void *TyOrEx, const SourceRange &ArgRange) { 1282 // If error parsing type, ignore. 1283 if (TyOrEx == 0) return ExprError(); 1284 1285 if (isType) { 1286 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1287 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1288 } 1289 1290 // Get the end location. 1291 Expr *ArgEx = (Expr *)TyOrEx; 1292 Action::OwningExprResult Result 1293 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1294 1295 if (Result.isInvalid()) 1296 DeleteExpr(ArgEx); 1297 1298 return move(Result); 1299} 1300 1301QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1302 if (V->isTypeDependent()) 1303 return Context.DependentTy; 1304 1305 DefaultFunctionArrayConversion(V); 1306 1307 // These operators return the element type of a complex type. 1308 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1309 return CT->getElementType(); 1310 1311 // Otherwise they pass through real integer and floating point types here. 1312 if (V->getType()->isArithmeticType()) 1313 return V->getType(); 1314 1315 // Reject anything else. 1316 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1317 << (isReal ? "__real" : "__imag"); 1318 return QualType(); 1319} 1320 1321 1322 1323Action::OwningExprResult 1324Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1325 tok::TokenKind Kind, ExprArg Input) { 1326 Expr *Arg = (Expr *)Input.get(); 1327 1328 UnaryOperator::Opcode Opc; 1329 switch (Kind) { 1330 default: assert(0 && "Unknown unary op!"); 1331 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1332 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1333 } 1334 1335 if (getLangOptions().CPlusPlus && 1336 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1337 // Which overloaded operator? 1338 OverloadedOperatorKind OverOp = 1339 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1340 1341 // C++ [over.inc]p1: 1342 // 1343 // [...] If the function is a member function with one 1344 // parameter (which shall be of type int) or a non-member 1345 // function with two parameters (the second of which shall be 1346 // of type int), it defines the postfix increment operator ++ 1347 // for objects of that type. When the postfix increment is 1348 // called as a result of using the ++ operator, the int 1349 // argument will have value zero. 1350 Expr *Args[2] = { 1351 Arg, 1352 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1353 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1354 }; 1355 1356 // Build the candidate set for overloading 1357 OverloadCandidateSet CandidateSet; 1358 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1359 1360 // Perform overload resolution. 1361 OverloadCandidateSet::iterator Best; 1362 switch (BestViableFunction(CandidateSet, Best)) { 1363 case OR_Success: { 1364 // We found a built-in operator or an overloaded operator. 1365 FunctionDecl *FnDecl = Best->Function; 1366 1367 if (FnDecl) { 1368 // We matched an overloaded operator. Build a call to that 1369 // operator. 1370 1371 // Convert the arguments. 1372 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1373 if (PerformObjectArgumentInitialization(Arg, Method)) 1374 return ExprError(); 1375 } else { 1376 // Convert the arguments. 1377 if (PerformCopyInitialization(Arg, 1378 FnDecl->getParamDecl(0)->getType(), 1379 "passing")) 1380 return ExprError(); 1381 } 1382 1383 // Determine the result type 1384 QualType ResultTy 1385 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1386 ResultTy = ResultTy.getNonReferenceType(); 1387 1388 // Build the actual expression node. 1389 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1390 SourceLocation()); 1391 UsualUnaryConversions(FnExpr); 1392 1393 Input.release(); 1394 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1395 Args, 2, ResultTy, 1396 OpLoc)); 1397 } else { 1398 // We matched a built-in operator. Convert the arguments, then 1399 // break out so that we will build the appropriate built-in 1400 // operator node. 1401 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1402 "passing")) 1403 return ExprError(); 1404 1405 break; 1406 } 1407 } 1408 1409 case OR_No_Viable_Function: 1410 // No viable function; fall through to handling this as a 1411 // built-in operator, which will produce an error message for us. 1412 break; 1413 1414 case OR_Ambiguous: 1415 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1416 << UnaryOperator::getOpcodeStr(Opc) 1417 << Arg->getSourceRange(); 1418 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1419 return ExprError(); 1420 1421 case OR_Deleted: 1422 Diag(OpLoc, diag::err_ovl_deleted_oper) 1423 << Best->Function->isDeleted() 1424 << UnaryOperator::getOpcodeStr(Opc) 1425 << Arg->getSourceRange(); 1426 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1427 return ExprError(); 1428 } 1429 1430 // Either we found no viable overloaded operator or we matched a 1431 // built-in operator. In either case, fall through to trying to 1432 // build a built-in operation. 1433 } 1434 1435 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1436 Opc == UnaryOperator::PostInc); 1437 if (result.isNull()) 1438 return ExprError(); 1439 Input.release(); 1440 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1441} 1442 1443Action::OwningExprResult 1444Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1445 ExprArg Idx, SourceLocation RLoc) { 1446 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1447 *RHSExp = static_cast<Expr*>(Idx.get()); 1448 1449 if (getLangOptions().CPlusPlus && 1450 (LHSExp->getType()->isRecordType() || 1451 LHSExp->getType()->isEnumeralType() || 1452 RHSExp->getType()->isRecordType() || 1453 RHSExp->getType()->isEnumeralType())) { 1454 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1455 // to the candidate set. 1456 OverloadCandidateSet CandidateSet; 1457 Expr *Args[2] = { LHSExp, RHSExp }; 1458 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1459 SourceRange(LLoc, RLoc)); 1460 1461 // Perform overload resolution. 1462 OverloadCandidateSet::iterator Best; 1463 switch (BestViableFunction(CandidateSet, Best)) { 1464 case OR_Success: { 1465 // We found a built-in operator or an overloaded operator. 1466 FunctionDecl *FnDecl = Best->Function; 1467 1468 if (FnDecl) { 1469 // We matched an overloaded operator. Build a call to that 1470 // operator. 1471 1472 // Convert the arguments. 1473 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1474 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1475 PerformCopyInitialization(RHSExp, 1476 FnDecl->getParamDecl(0)->getType(), 1477 "passing")) 1478 return ExprError(); 1479 } else { 1480 // Convert the arguments. 1481 if (PerformCopyInitialization(LHSExp, 1482 FnDecl->getParamDecl(0)->getType(), 1483 "passing") || 1484 PerformCopyInitialization(RHSExp, 1485 FnDecl->getParamDecl(1)->getType(), 1486 "passing")) 1487 return ExprError(); 1488 } 1489 1490 // Determine the result type 1491 QualType ResultTy 1492 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1493 ResultTy = ResultTy.getNonReferenceType(); 1494 1495 // Build the actual expression node. 1496 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1497 SourceLocation()); 1498 UsualUnaryConversions(FnExpr); 1499 1500 Base.release(); 1501 Idx.release(); 1502 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1503 FnExpr, Args, 2, 1504 ResultTy, LLoc)); 1505 } else { 1506 // We matched a built-in operator. Convert the arguments, then 1507 // break out so that we will build the appropriate built-in 1508 // operator node. 1509 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1510 "passing") || 1511 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1512 "passing")) 1513 return ExprError(); 1514 1515 break; 1516 } 1517 } 1518 1519 case OR_No_Viable_Function: 1520 // No viable function; fall through to handling this as a 1521 // built-in operator, which will produce an error message for us. 1522 break; 1523 1524 case OR_Ambiguous: 1525 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1526 << "[]" 1527 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1528 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1529 return ExprError(); 1530 1531 case OR_Deleted: 1532 Diag(LLoc, diag::err_ovl_deleted_oper) 1533 << Best->Function->isDeleted() 1534 << "[]" 1535 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1536 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1537 return ExprError(); 1538 } 1539 1540 // Either we found no viable overloaded operator or we matched a 1541 // built-in operator. In either case, fall through to trying to 1542 // build a built-in operation. 1543 } 1544 1545 // Perform default conversions. 1546 DefaultFunctionArrayConversion(LHSExp); 1547 DefaultFunctionArrayConversion(RHSExp); 1548 1549 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1550 1551 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1552 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1553 // in the subscript position. As a result, we need to derive the array base 1554 // and index from the expression types. 1555 Expr *BaseExpr, *IndexExpr; 1556 QualType ResultType; 1557 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1558 BaseExpr = LHSExp; 1559 IndexExpr = RHSExp; 1560 ResultType = Context.DependentTy; 1561 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1562 BaseExpr = LHSExp; 1563 IndexExpr = RHSExp; 1564 // FIXME: need to deal with const... 1565 ResultType = PTy->getPointeeType(); 1566 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1567 // Handle the uncommon case of "123[Ptr]". 1568 BaseExpr = RHSExp; 1569 IndexExpr = LHSExp; 1570 // FIXME: need to deal with const... 1571 ResultType = PTy->getPointeeType(); 1572 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1573 BaseExpr = LHSExp; // vectors: V[123] 1574 IndexExpr = RHSExp; 1575 1576 // FIXME: need to deal with const... 1577 ResultType = VTy->getElementType(); 1578 } else { 1579 return ExprError(Diag(LHSExp->getLocStart(), 1580 diag::err_typecheck_subscript_value) << RHSExp->getSourceRange()); 1581 } 1582 // C99 6.5.2.1p1 1583 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1584 return ExprError(Diag(IndexExpr->getLocStart(), 1585 diag::err_typecheck_subscript) << IndexExpr->getSourceRange()); 1586 1587 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1588 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1589 // type. Note that Functions are not objects, and that (in C99 parlance) 1590 // incomplete types are not object types. 1591 if (ResultType->isFunctionType()) { 1592 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1593 << ResultType << BaseExpr->getSourceRange(); 1594 return ExprError(); 1595 } 1596 if (!ResultType->isDependentType() && 1597 RequireCompleteType(BaseExpr->getLocStart(), ResultType, 1598 diag::err_subscript_incomplete_type, 1599 BaseExpr->getSourceRange())) 1600 return ExprError(); 1601 1602 Base.release(); 1603 Idx.release(); 1604 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1605 ResultType, RLoc)); 1606} 1607 1608QualType Sema:: 1609CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1610 IdentifierInfo &CompName, SourceLocation CompLoc) { 1611 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1612 1613 // The vector accessor can't exceed the number of elements. 1614 const char *compStr = CompName.getName(); 1615 1616 // This flag determines whether or not the component is one of the four 1617 // special names that indicate a subset of exactly half the elements are 1618 // to be selected. 1619 bool HalvingSwizzle = false; 1620 1621 // This flag determines whether or not CompName has an 's' char prefix, 1622 // indicating that it is a string of hex values to be used as vector indices. 1623 bool HexSwizzle = *compStr == 's'; 1624 1625 // Check that we've found one of the special components, or that the component 1626 // names must come from the same set. 1627 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1628 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1629 HalvingSwizzle = true; 1630 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1631 do 1632 compStr++; 1633 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1634 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1635 do 1636 compStr++; 1637 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1638 } 1639 1640 if (!HalvingSwizzle && *compStr) { 1641 // We didn't get to the end of the string. This means the component names 1642 // didn't come from the same set *or* we encountered an illegal name. 1643 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1644 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1645 return QualType(); 1646 } 1647 1648 // Ensure no component accessor exceeds the width of the vector type it 1649 // operates on. 1650 if (!HalvingSwizzle) { 1651 compStr = CompName.getName(); 1652 1653 if (HexSwizzle) 1654 compStr++; 1655 1656 while (*compStr) { 1657 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1658 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1659 << baseType << SourceRange(CompLoc); 1660 return QualType(); 1661 } 1662 } 1663 } 1664 1665 // If this is a halving swizzle, verify that the base type has an even 1666 // number of elements. 1667 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1668 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1669 << baseType << SourceRange(CompLoc); 1670 return QualType(); 1671 } 1672 1673 // The component accessor looks fine - now we need to compute the actual type. 1674 // The vector type is implied by the component accessor. For example, 1675 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1676 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1677 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1678 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1679 : CompName.getLength(); 1680 if (HexSwizzle) 1681 CompSize--; 1682 1683 if (CompSize == 1) 1684 return vecType->getElementType(); 1685 1686 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1687 // Now look up the TypeDefDecl from the vector type. Without this, 1688 // diagostics look bad. We want extended vector types to appear built-in. 1689 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1690 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1691 return Context.getTypedefType(ExtVectorDecls[i]); 1692 } 1693 return VT; // should never get here (a typedef type should always be found). 1694} 1695 1696static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1697 IdentifierInfo &Member, 1698 const Selector &Sel) { 1699 1700 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(&Member)) 1701 return PD; 1702 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 1703 return OMD; 1704 1705 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1706 E = PDecl->protocol_end(); I != E; ++I) { 1707 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel)) 1708 return D; 1709 } 1710 return 0; 1711} 1712 1713static Decl *FindGetterNameDecl(const ObjCQualifiedIdType *QIdTy, 1714 IdentifierInfo &Member, 1715 const Selector &Sel) { 1716 // Check protocols on qualified interfaces. 1717 Decl *GDecl = 0; 1718 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1719 E = QIdTy->qual_end(); I != E; ++I) { 1720 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1721 GDecl = PD; 1722 break; 1723 } 1724 // Also must look for a getter name which uses property syntax. 1725 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1726 GDecl = OMD; 1727 break; 1728 } 1729 } 1730 if (!GDecl) { 1731 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1732 E = QIdTy->qual_end(); I != E; ++I) { 1733 // Search in the protocol-qualifier list of current protocol. 1734 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel); 1735 if (GDecl) 1736 return GDecl; 1737 } 1738 } 1739 return GDecl; 1740} 1741 1742/// FindMethodInNestedImplementations - Look up a method in current and 1743/// all base class implementations. 1744/// 1745ObjCMethodDecl *Sema::FindMethodInNestedImplementations( 1746 const ObjCInterfaceDecl *IFace, 1747 const Selector &Sel) { 1748 ObjCMethodDecl *Method = 0; 1749 if (ObjCImplementationDecl *ImpDecl = 1750 Sema::ObjCImplementations[IFace->getIdentifier()]) 1751 Method = ImpDecl->getInstanceMethod(Sel); 1752 1753 if (!Method && IFace->getSuperClass()) 1754 return FindMethodInNestedImplementations(IFace->getSuperClass(), Sel); 1755 return Method; 1756} 1757 1758Action::OwningExprResult 1759Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1760 tok::TokenKind OpKind, SourceLocation MemberLoc, 1761 IdentifierInfo &Member, 1762 DeclPtrTy ObjCImpDecl) { 1763 Expr *BaseExpr = static_cast<Expr *>(Base.release()); 1764 assert(BaseExpr && "no record expression"); 1765 1766 // Perform default conversions. 1767 DefaultFunctionArrayConversion(BaseExpr); 1768 1769 QualType BaseType = BaseExpr->getType(); 1770 assert(!BaseType.isNull() && "no type for member expression"); 1771 1772 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1773 // must have pointer type, and the accessed type is the pointee. 1774 if (OpKind == tok::arrow) { 1775 if (const PointerType *PT = BaseType->getAsPointerType()) 1776 BaseType = PT->getPointeeType(); 1777 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1778 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1779 MemberLoc, Member)); 1780 else 1781 return ExprError(Diag(MemberLoc, 1782 diag::err_typecheck_member_reference_arrow) 1783 << BaseType << BaseExpr->getSourceRange()); 1784 } 1785 1786 // Handle field access to simple records. This also handles access to fields 1787 // of the ObjC 'id' struct. 1788 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1789 RecordDecl *RDecl = RTy->getDecl(); 1790 if (RequireCompleteType(OpLoc, BaseType, 1791 diag::err_typecheck_incomplete_tag, 1792 BaseExpr->getSourceRange())) 1793 return ExprError(); 1794 1795 // The record definition is complete, now make sure the member is valid. 1796 // FIXME: Qualified name lookup for C++ is a bit more complicated 1797 // than this. 1798 LookupResult Result 1799 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1800 LookupMemberName, false); 1801 1802 if (!Result) 1803 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1804 << &Member << BaseExpr->getSourceRange()); 1805 if (Result.isAmbiguous()) { 1806 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1807 MemberLoc, BaseExpr->getSourceRange()); 1808 return ExprError(); 1809 } 1810 1811 NamedDecl *MemberDecl = Result; 1812 1813 // If the decl being referenced had an error, return an error for this 1814 // sub-expr without emitting another error, in order to avoid cascading 1815 // error cases. 1816 if (MemberDecl->isInvalidDecl()) 1817 return ExprError(); 1818 1819 // Check the use of this field 1820 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 1821 return ExprError(); 1822 1823 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1824 // We may have found a field within an anonymous union or struct 1825 // (C++ [class.union]). 1826 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1827 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1828 BaseExpr, OpLoc); 1829 1830 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1831 // FIXME: Handle address space modifiers 1832 QualType MemberType = FD->getType(); 1833 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1834 MemberType = Ref->getPointeeType(); 1835 else { 1836 unsigned combinedQualifiers = 1837 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1838 if (FD->isMutable()) 1839 combinedQualifiers &= ~QualType::Const; 1840 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1841 } 1842 1843 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1844 MemberLoc, MemberType)); 1845 } 1846 1847 if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) 1848 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1849 Var, MemberLoc, 1850 Var->getType().getNonReferenceType())); 1851 if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 1852 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1853 MemberFn, MemberLoc, 1854 MemberFn->getType())); 1855 if (OverloadedFunctionDecl *Ovl 1856 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 1857 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 1858 MemberLoc, Context.OverloadTy)); 1859 if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 1860 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1861 Enum, MemberLoc, Enum->getType())); 1862 if (isa<TypeDecl>(MemberDecl)) 1863 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 1864 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1865 1866 // We found a declaration kind that we didn't expect. This is a 1867 // generic error message that tells the user that she can't refer 1868 // to this member with '.' or '->'. 1869 return ExprError(Diag(MemberLoc, 1870 diag::err_typecheck_member_reference_unknown) 1871 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1872 } 1873 1874 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1875 // (*Obj).ivar. 1876 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1877 ObjCInterfaceDecl *ClassDeclared; 1878 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member, 1879 ClassDeclared)) { 1880 // If the decl being referenced had an error, return an error for this 1881 // sub-expr without emitting another error, in order to avoid cascading 1882 // error cases. 1883 if (IV->isInvalidDecl()) 1884 return ExprError(); 1885 1886 // Check whether we can reference this field. 1887 if (DiagnoseUseOfDecl(IV, MemberLoc)) 1888 return ExprError(); 1889 if (IV->getAccessControl() != ObjCIvarDecl::Public && 1890 IV->getAccessControl() != ObjCIvarDecl::Package) { 1891 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 1892 if (ObjCMethodDecl *MD = getCurMethodDecl()) 1893 ClassOfMethodDecl = MD->getClassInterface(); 1894 else if (ObjCImpDecl && getCurFunctionDecl()) { 1895 // Case of a c-function declared inside an objc implementation. 1896 // FIXME: For a c-style function nested inside an objc implementation 1897 // class, there is no implementation context available, so we pass down 1898 // the context as argument to this routine. Ideally, this context need 1899 // be passed down in the AST node and somehow calculated from the AST 1900 // for a function decl. 1901 Decl *ImplDecl = ObjCImpDecl.getAs<Decl>(); 1902 if (ObjCImplementationDecl *IMPD = 1903 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 1904 ClassOfMethodDecl = IMPD->getClassInterface(); 1905 else if (ObjCCategoryImplDecl* CatImplClass = 1906 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 1907 ClassOfMethodDecl = CatImplClass->getClassInterface(); 1908 } 1909 1910 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 1911 if (ClassDeclared != IFTy->getDecl() || 1912 ClassOfMethodDecl != ClassDeclared) 1913 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 1914 } 1915 // @protected 1916 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 1917 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 1918 } 1919 1920 ObjCIvarRefExpr *MRef= new (Context) ObjCIvarRefExpr(IV, IV->getType(), 1921 MemberLoc, BaseExpr, 1922 OpKind == tok::arrow); 1923 Context.setFieldDecl(IFTy->getDecl(), IV, MRef); 1924 return Owned(MRef); 1925 } 1926 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1927 << IFTy->getDecl()->getDeclName() << &Member 1928 << BaseExpr->getSourceRange()); 1929 } 1930 1931 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1932 // pointer to a (potentially qualified) interface type. 1933 const PointerType *PTy; 1934 const ObjCInterfaceType *IFTy; 1935 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1936 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1937 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1938 1939 // Search for a declared property first. 1940 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) { 1941 // Check whether we can reference this property. 1942 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1943 return ExprError(); 1944 1945 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1946 MemberLoc, BaseExpr)); 1947 } 1948 1949 // Check protocols on qualified interfaces. 1950 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1951 E = IFTy->qual_end(); I != E; ++I) 1952 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1953 // Check whether we can reference this property. 1954 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1955 return ExprError(); 1956 1957 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1958 MemberLoc, BaseExpr)); 1959 } 1960 1961 // If that failed, look for an "implicit" property by seeing if the nullary 1962 // selector is implemented. 1963 1964 // FIXME: The logic for looking up nullary and unary selectors should be 1965 // shared with the code in ActOnInstanceMessage. 1966 1967 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1968 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1969 1970 // If this reference is in an @implementation, check for 'private' methods. 1971 if (!Getter) 1972 Getter = FindMethodInNestedImplementations(IFace, Sel); 1973 1974 // Look through local category implementations associated with the class. 1975 if (!Getter) { 1976 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1977 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1978 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1979 } 1980 } 1981 if (Getter) { 1982 // Check if we can reference this property. 1983 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1984 return ExprError(); 1985 } 1986 // If we found a getter then this may be a valid dot-reference, we 1987 // will look for the matching setter, in case it is needed. 1988 Selector SetterSel = 1989 SelectorTable::constructSetterName(PP.getIdentifierTable(), 1990 PP.getSelectorTable(), &Member); 1991 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1992 if (!Setter) { 1993 // If this reference is in an @implementation, also check for 'private' 1994 // methods. 1995 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 1996 } 1997 // Look through local category implementations associated with the class. 1998 if (!Setter) { 1999 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2000 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2001 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 2002 } 2003 } 2004 2005 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2006 return ExprError(); 2007 2008 if (Getter || Setter) { 2009 QualType PType; 2010 2011 if (Getter) 2012 PType = Getter->getResultType(); 2013 else { 2014 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2015 E = Setter->param_end(); PI != E; ++PI) 2016 PType = (*PI)->getType(); 2017 } 2018 // FIXME: we must check that the setter has property type. 2019 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2020 Setter, MemberLoc, BaseExpr)); 2021 } 2022 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2023 << &Member << BaseType); 2024 } 2025 // Handle properties on qualified "id" protocols. 2026 const ObjCQualifiedIdType *QIdTy; 2027 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2028 // Check protocols on qualified interfaces. 2029 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2030 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel)) { 2031 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2032 // Check the use of this declaration 2033 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2034 return ExprError(); 2035 2036 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2037 MemberLoc, BaseExpr)); 2038 } 2039 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2040 // Check the use of this method. 2041 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2042 return ExprError(); 2043 2044 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2045 OMD->getResultType(), 2046 OMD, OpLoc, MemberLoc, 2047 NULL, 0)); 2048 } 2049 } 2050 2051 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2052 << &Member << BaseType); 2053 } 2054 // Handle properties on ObjC 'Class' types. 2055 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2056 // Also must look for a getter name which uses property syntax. 2057 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2058 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2059 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2060 ObjCMethodDecl *Getter; 2061 // FIXME: need to also look locally in the implementation. 2062 if ((Getter = IFace->lookupClassMethod(Sel))) { 2063 // Check the use of this method. 2064 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2065 return ExprError(); 2066 } 2067 // If we found a getter then this may be a valid dot-reference, we 2068 // will look for the matching setter, in case it is needed. 2069 Selector SetterSel = 2070 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2071 PP.getSelectorTable(), &Member); 2072 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2073 if (!Setter) { 2074 // If this reference is in an @implementation, also check for 'private' 2075 // methods. 2076 Setter = FindMethodInNestedImplementations(IFace, SetterSel); 2077 } 2078 // Look through local category implementations associated with the class. 2079 if (!Setter) { 2080 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2081 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2082 Setter = ObjCCategoryImpls[i]->getClassMethod(SetterSel); 2083 } 2084 } 2085 2086 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2087 return ExprError(); 2088 2089 if (Getter || Setter) { 2090 QualType PType; 2091 2092 if (Getter) 2093 PType = Getter->getResultType(); 2094 else { 2095 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2096 E = Setter->param_end(); PI != E; ++PI) 2097 PType = (*PI)->getType(); 2098 } 2099 // FIXME: we must check that the setter has property type. 2100 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2101 Setter, MemberLoc, BaseExpr)); 2102 } 2103 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2104 << &Member << BaseType); 2105 } 2106 } 2107 2108 // Handle 'field access' to vectors, such as 'V.xx'. 2109 if (BaseType->isExtVectorType()) { 2110 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2111 if (ret.isNull()) 2112 return ExprError(); 2113 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2114 MemberLoc)); 2115 } 2116 2117 Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 2118 << BaseType << BaseExpr->getSourceRange(); 2119 2120 // If the user is trying to apply -> or . to a function or function 2121 // pointer, it's probably because they forgot parentheses to call 2122 // the function. Suggest the addition of those parentheses. 2123 if (BaseType == Context.OverloadTy || 2124 BaseType->isFunctionType() || 2125 (BaseType->isPointerType() && 2126 BaseType->getAsPointerType()->isFunctionType())) { 2127 SourceLocation Loc = PP.getLocForEndOfToken(BaseExpr->getLocEnd()); 2128 Diag(Loc, diag::note_member_reference_needs_call) 2129 << CodeModificationHint::CreateInsertion(Loc, "()"); 2130 } 2131 2132 return ExprError(); 2133} 2134 2135/// ConvertArgumentsForCall - Converts the arguments specified in 2136/// Args/NumArgs to the parameter types of the function FDecl with 2137/// function prototype Proto. Call is the call expression itself, and 2138/// Fn is the function expression. For a C++ member function, this 2139/// routine does not attempt to convert the object argument. Returns 2140/// true if the call is ill-formed. 2141bool 2142Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2143 FunctionDecl *FDecl, 2144 const FunctionProtoType *Proto, 2145 Expr **Args, unsigned NumArgs, 2146 SourceLocation RParenLoc) { 2147 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2148 // assignment, to the types of the corresponding parameter, ... 2149 unsigned NumArgsInProto = Proto->getNumArgs(); 2150 unsigned NumArgsToCheck = NumArgs; 2151 bool Invalid = false; 2152 2153 // If too few arguments are available (and we don't have default 2154 // arguments for the remaining parameters), don't make the call. 2155 if (NumArgs < NumArgsInProto) { 2156 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2157 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2158 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2159 // Use default arguments for missing arguments 2160 NumArgsToCheck = NumArgsInProto; 2161 Call->setNumArgs(Context, NumArgsInProto); 2162 } 2163 2164 // If too many are passed and not variadic, error on the extras and drop 2165 // them. 2166 if (NumArgs > NumArgsInProto) { 2167 if (!Proto->isVariadic()) { 2168 Diag(Args[NumArgsInProto]->getLocStart(), 2169 diag::err_typecheck_call_too_many_args) 2170 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2171 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2172 Args[NumArgs-1]->getLocEnd()); 2173 // This deletes the extra arguments. 2174 Call->setNumArgs(Context, NumArgsInProto); 2175 Invalid = true; 2176 } 2177 NumArgsToCheck = NumArgsInProto; 2178 } 2179 2180 // Continue to check argument types (even if we have too few/many args). 2181 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2182 QualType ProtoArgType = Proto->getArgType(i); 2183 2184 Expr *Arg; 2185 if (i < NumArgs) { 2186 Arg = Args[i]; 2187 2188 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2189 ProtoArgType, 2190 diag::err_call_incomplete_argument, 2191 Arg->getSourceRange())) 2192 return true; 2193 2194 // Pass the argument. 2195 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2196 return true; 2197 } else 2198 // We already type-checked the argument, so we know it works. 2199 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2200 QualType ArgType = Arg->getType(); 2201 2202 Call->setArg(i, Arg); 2203 } 2204 2205 // If this is a variadic call, handle args passed through "...". 2206 if (Proto->isVariadic()) { 2207 VariadicCallType CallType = VariadicFunction; 2208 if (Fn->getType()->isBlockPointerType()) 2209 CallType = VariadicBlock; // Block 2210 else if (isa<MemberExpr>(Fn)) 2211 CallType = VariadicMethod; 2212 2213 // Promote the arguments (C99 6.5.2.2p7). 2214 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2215 Expr *Arg = Args[i]; 2216 DefaultVariadicArgumentPromotion(Arg, CallType); 2217 Call->setArg(i, Arg); 2218 } 2219 } 2220 2221 return Invalid; 2222} 2223 2224/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2225/// This provides the location of the left/right parens and a list of comma 2226/// locations. 2227Action::OwningExprResult 2228Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2229 MultiExprArg args, 2230 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2231 unsigned NumArgs = args.size(); 2232 Expr *Fn = static_cast<Expr *>(fn.release()); 2233 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2234 assert(Fn && "no function call expression"); 2235 FunctionDecl *FDecl = NULL; 2236 DeclarationName UnqualifiedName; 2237 2238 if (getLangOptions().CPlusPlus) { 2239 // Determine whether this is a dependent call inside a C++ template, 2240 // in which case we won't do any semantic analysis now. 2241 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 2242 bool Dependent = false; 2243 if (Fn->isTypeDependent()) 2244 Dependent = true; 2245 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2246 Dependent = true; 2247 2248 if (Dependent) 2249 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2250 Context.DependentTy, RParenLoc)); 2251 2252 // Determine whether this is a call to an object (C++ [over.call.object]). 2253 if (Fn->getType()->isRecordType()) 2254 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2255 CommaLocs, RParenLoc)); 2256 2257 // Determine whether this is a call to a member function. 2258 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2259 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2260 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2261 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2262 CommaLocs, RParenLoc)); 2263 } 2264 2265 // If we're directly calling a function, get the appropriate declaration. 2266 DeclRefExpr *DRExpr = NULL; 2267 Expr *FnExpr = Fn; 2268 bool ADL = true; 2269 while (true) { 2270 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2271 FnExpr = IcExpr->getSubExpr(); 2272 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2273 // Parentheses around a function disable ADL 2274 // (C++0x [basic.lookup.argdep]p1). 2275 ADL = false; 2276 FnExpr = PExpr->getSubExpr(); 2277 } else if (isa<UnaryOperator>(FnExpr) && 2278 cast<UnaryOperator>(FnExpr)->getOpcode() 2279 == UnaryOperator::AddrOf) { 2280 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2281 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2282 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2283 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2284 break; 2285 } else if (UnresolvedFunctionNameExpr *DepName 2286 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2287 UnqualifiedName = DepName->getName(); 2288 break; 2289 } else { 2290 // Any kind of name that does not refer to a declaration (or 2291 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2292 ADL = false; 2293 break; 2294 } 2295 } 2296 2297 OverloadedFunctionDecl *Ovl = 0; 2298 if (DRExpr) { 2299 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2300 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2301 } 2302 2303 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2304 // We don't perform ADL for implicit declarations of builtins. 2305 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2306 ADL = false; 2307 2308 // We don't perform ADL in C. 2309 if (!getLangOptions().CPlusPlus) 2310 ADL = false; 2311 2312 if (Ovl || ADL) { 2313 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2314 UnqualifiedName, LParenLoc, Args, 2315 NumArgs, CommaLocs, RParenLoc, ADL); 2316 if (!FDecl) 2317 return ExprError(); 2318 2319 // Update Fn to refer to the actual function selected. 2320 Expr *NewFn = 0; 2321 if (QualifiedDeclRefExpr *QDRExpr 2322 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2323 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2324 QDRExpr->getLocation(), 2325 false, false, 2326 QDRExpr->getQualifierRange(), 2327 QDRExpr->getQualifier()); 2328 else 2329 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2330 Fn->getSourceRange().getBegin()); 2331 Fn->Destroy(Context); 2332 Fn = NewFn; 2333 } 2334 } 2335 2336 // Promote the function operand. 2337 UsualUnaryConversions(Fn); 2338 2339 // Make the call expr early, before semantic checks. This guarantees cleanup 2340 // of arguments and function on error. 2341 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2342 Args, NumArgs, 2343 Context.BoolTy, 2344 RParenLoc)); 2345 2346 const FunctionType *FuncT; 2347 if (!Fn->getType()->isBlockPointerType()) { 2348 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2349 // have type pointer to function". 2350 const PointerType *PT = Fn->getType()->getAsPointerType(); 2351 if (PT == 0) 2352 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2353 << Fn->getType() << Fn->getSourceRange()); 2354 FuncT = PT->getPointeeType()->getAsFunctionType(); 2355 } else { // This is a block call. 2356 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2357 getAsFunctionType(); 2358 } 2359 if (FuncT == 0) 2360 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2361 << Fn->getType() << Fn->getSourceRange()); 2362 2363 // Check for a valid return type 2364 if (!FuncT->getResultType()->isVoidType() && 2365 RequireCompleteType(Fn->getSourceRange().getBegin(), 2366 FuncT->getResultType(), 2367 diag::err_call_incomplete_return, 2368 TheCall->getSourceRange())) 2369 return ExprError(); 2370 2371 // We know the result type of the call, set it. 2372 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2373 2374 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2375 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2376 RParenLoc)) 2377 return ExprError(); 2378 } else { 2379 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2380 2381 if (FDecl) { 2382 // Check if we have too few/too many template arguments, based 2383 // on our knowledge of the function definition. 2384 const FunctionDecl *Def = 0; 2385 if (FDecl->getBody(Def) && NumArgs != Def->param_size()) 2386 Diag(RParenLoc, diag::warn_call_wrong_number_of_arguments) 2387 << (NumArgs > Def->param_size()) << FDecl << Fn->getSourceRange(); 2388 } 2389 2390 // Promote the arguments (C99 6.5.2.2p6). 2391 for (unsigned i = 0; i != NumArgs; i++) { 2392 Expr *Arg = Args[i]; 2393 DefaultArgumentPromotion(Arg); 2394 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2395 Arg->getType(), 2396 diag::err_call_incomplete_argument, 2397 Arg->getSourceRange())) 2398 return ExprError(); 2399 TheCall->setArg(i, Arg); 2400 } 2401 } 2402 2403 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2404 if (!Method->isStatic()) 2405 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2406 << Fn->getSourceRange()); 2407 2408 // Do special checking on direct calls to functions. 2409 if (FDecl) 2410 return CheckFunctionCall(FDecl, TheCall.take()); 2411 2412 return Owned(TheCall.take()); 2413} 2414 2415Action::OwningExprResult 2416Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2417 SourceLocation RParenLoc, ExprArg InitExpr) { 2418 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2419 QualType literalType = QualType::getFromOpaquePtr(Ty); 2420 // FIXME: put back this assert when initializers are worked out. 2421 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2422 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2423 2424 if (literalType->isArrayType()) { 2425 if (literalType->isVariableArrayType()) 2426 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2427 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2428 } else if (RequireCompleteType(LParenLoc, literalType, 2429 diag::err_typecheck_decl_incomplete_type, 2430 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2431 return ExprError(); 2432 2433 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2434 DeclarationName(), /*FIXME:DirectInit=*/false)) 2435 return ExprError(); 2436 2437 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2438 if (isFileScope) { // 6.5.2.5p3 2439 if (CheckForConstantInitializer(literalExpr, literalType)) 2440 return ExprError(); 2441 } 2442 InitExpr.release(); 2443 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2444 literalExpr, isFileScope)); 2445} 2446 2447Action::OwningExprResult 2448Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2449 SourceLocation RBraceLoc) { 2450 unsigned NumInit = initlist.size(); 2451 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2452 2453 // Semantic analysis for initializers is done by ActOnDeclarator() and 2454 // CheckInitializer() - it requires knowledge of the object being intialized. 2455 2456 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2457 RBraceLoc); 2458 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2459 return Owned(E); 2460} 2461 2462/// CheckCastTypes - Check type constraints for casting between types. 2463bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2464 UsualUnaryConversions(castExpr); 2465 2466 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2467 // type needs to be scalar. 2468 if (castType->isVoidType()) { 2469 // Cast to void allows any expr type. 2470 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2471 // We can't check any more until template instantiation time. 2472 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2473 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2474 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2475 (castType->isStructureType() || castType->isUnionType())) { 2476 // GCC struct/union extension: allow cast to self. 2477 // FIXME: Check that the cast destination type is complete. 2478 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2479 << castType << castExpr->getSourceRange(); 2480 } else if (castType->isUnionType()) { 2481 // GCC cast to union extension 2482 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2483 RecordDecl::field_iterator Field, FieldEnd; 2484 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 2485 Field != FieldEnd; ++Field) { 2486 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2487 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2488 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2489 << castExpr->getSourceRange(); 2490 break; 2491 } 2492 } 2493 if (Field == FieldEnd) 2494 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2495 << castExpr->getType() << castExpr->getSourceRange(); 2496 } else { 2497 // Reject any other conversions to non-scalar types. 2498 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2499 << castType << castExpr->getSourceRange(); 2500 } 2501 } else if (!castExpr->getType()->isScalarType() && 2502 !castExpr->getType()->isVectorType()) { 2503 return Diag(castExpr->getLocStart(), 2504 diag::err_typecheck_expect_scalar_operand) 2505 << castExpr->getType() << castExpr->getSourceRange(); 2506 } else if (castExpr->getType()->isVectorType()) { 2507 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2508 return true; 2509 } else if (castType->isVectorType()) { 2510 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2511 return true; 2512 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2513 Diag(castExpr->getLocStart(), diag::warn_super_cast_deprecated) << TyR; 2514 } 2515 return false; 2516} 2517 2518bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2519 assert(VectorTy->isVectorType() && "Not a vector type!"); 2520 2521 if (Ty->isVectorType() || Ty->isIntegerType()) { 2522 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2523 return Diag(R.getBegin(), 2524 Ty->isVectorType() ? 2525 diag::err_invalid_conversion_between_vectors : 2526 diag::err_invalid_conversion_between_vector_and_integer) 2527 << VectorTy << Ty << R; 2528 } else 2529 return Diag(R.getBegin(), 2530 diag::err_invalid_conversion_between_vector_and_scalar) 2531 << VectorTy << Ty << R; 2532 2533 return false; 2534} 2535 2536Action::OwningExprResult 2537Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2538 SourceLocation RParenLoc, ExprArg Op) { 2539 assert((Ty != 0) && (Op.get() != 0) && 2540 "ActOnCastExpr(): missing type or expr"); 2541 2542 Expr *castExpr = static_cast<Expr*>(Op.release()); 2543 QualType castType = QualType::getFromOpaquePtr(Ty); 2544 2545 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2546 return ExprError(); 2547 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2548 LParenLoc, RParenLoc)); 2549} 2550 2551/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2552/// In that case, lhs = cond. 2553/// C99 6.5.15 2554QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2555 SourceLocation QuestionLoc) { 2556 UsualUnaryConversions(Cond); 2557 UsualUnaryConversions(LHS); 2558 UsualUnaryConversions(RHS); 2559 QualType CondTy = Cond->getType(); 2560 QualType LHSTy = LHS->getType(); 2561 QualType RHSTy = RHS->getType(); 2562 2563 // first, check the condition. 2564 if (!Cond->isTypeDependent()) { 2565 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2566 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2567 << CondTy; 2568 return QualType(); 2569 } 2570 } 2571 2572 // Now check the two expressions. 2573 if ((LHS && LHS->isTypeDependent()) || (RHS && RHS->isTypeDependent())) 2574 return Context.DependentTy; 2575 2576 // If both operands have arithmetic type, do the usual arithmetic conversions 2577 // to find a common type: C99 6.5.15p3,5. 2578 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2579 UsualArithmeticConversions(LHS, RHS); 2580 return LHS->getType(); 2581 } 2582 2583 // If both operands are the same structure or union type, the result is that 2584 // type. 2585 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2586 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2587 if (LHSRT->getDecl() == RHSRT->getDecl()) 2588 // "If both the operands have structure or union type, the result has 2589 // that type." This implies that CV qualifiers are dropped. 2590 return LHSTy.getUnqualifiedType(); 2591 // FIXME: Type of conditional expression must be complete in C mode. 2592 } 2593 2594 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2595 // The following || allows only one side to be void (a GCC-ism). 2596 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2597 if (!LHSTy->isVoidType()) 2598 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2599 << RHS->getSourceRange(); 2600 if (!RHSTy->isVoidType()) 2601 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2602 << LHS->getSourceRange(); 2603 ImpCastExprToType(LHS, Context.VoidTy); 2604 ImpCastExprToType(RHS, Context.VoidTy); 2605 return Context.VoidTy; 2606 } 2607 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2608 // the type of the other operand." 2609 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2610 Context.isObjCObjectPointerType(LHSTy)) && 2611 RHS->isNullPointerConstant(Context)) { 2612 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2613 return LHSTy; 2614 } 2615 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2616 Context.isObjCObjectPointerType(RHSTy)) && 2617 LHS->isNullPointerConstant(Context)) { 2618 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2619 return RHSTy; 2620 } 2621 2622 // Handle the case where both operands are pointers before we handle null 2623 // pointer constants in case both operands are null pointer constants. 2624 if (const PointerType *LHSPT = LHSTy->getAsPointerType()) { // C99 6.5.15p3,6 2625 if (const PointerType *RHSPT = RHSTy->getAsPointerType()) { 2626 // get the "pointed to" types 2627 QualType lhptee = LHSPT->getPointeeType(); 2628 QualType rhptee = RHSPT->getPointeeType(); 2629 2630 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2631 if (lhptee->isVoidType() && 2632 rhptee->isIncompleteOrObjectType()) { 2633 // Figure out necessary qualifiers (C99 6.5.15p6) 2634 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2635 QualType destType = Context.getPointerType(destPointee); 2636 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2637 ImpCastExprToType(RHS, destType); // promote to void* 2638 return destType; 2639 } 2640 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2641 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2642 QualType destType = Context.getPointerType(destPointee); 2643 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2644 ImpCastExprToType(RHS, destType); // promote to void* 2645 return destType; 2646 } 2647 2648 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2649 // Two identical pointer types are always compatible. 2650 return LHSTy; 2651 } 2652 2653 QualType compositeType = LHSTy; 2654 2655 // If either type is an Objective-C object type then check 2656 // compatibility according to Objective-C. 2657 if (Context.isObjCObjectPointerType(LHSTy) || 2658 Context.isObjCObjectPointerType(RHSTy)) { 2659 // If both operands are interfaces and either operand can be 2660 // assigned to the other, use that type as the composite 2661 // type. This allows 2662 // xxx ? (A*) a : (B*) b 2663 // where B is a subclass of A. 2664 // 2665 // Additionally, as for assignment, if either type is 'id' 2666 // allow silent coercion. Finally, if the types are 2667 // incompatible then make sure to use 'id' as the composite 2668 // type so the result is acceptable for sending messages to. 2669 2670 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2671 // It could return the composite type. 2672 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2673 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2674 if (LHSIface && RHSIface && 2675 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2676 compositeType = LHSTy; 2677 } else if (LHSIface && RHSIface && 2678 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2679 compositeType = RHSTy; 2680 } else if (Context.isObjCIdStructType(lhptee) || 2681 Context.isObjCIdStructType(rhptee)) { 2682 compositeType = Context.getObjCIdType(); 2683 } else { 2684 Diag(QuestionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2685 << LHSTy << RHSTy 2686 << LHS->getSourceRange() << RHS->getSourceRange(); 2687 QualType incompatTy = Context.getObjCIdType(); 2688 ImpCastExprToType(LHS, incompatTy); 2689 ImpCastExprToType(RHS, incompatTy); 2690 return incompatTy; 2691 } 2692 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2693 rhptee.getUnqualifiedType())) { 2694 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2695 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2696 // In this situation, we assume void* type. No especially good 2697 // reason, but this is what gcc does, and we do have to pick 2698 // to get a consistent AST. 2699 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2700 ImpCastExprToType(LHS, incompatTy); 2701 ImpCastExprToType(RHS, incompatTy); 2702 return incompatTy; 2703 } 2704 // The pointer types are compatible. 2705 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2706 // differently qualified versions of compatible types, the result type is 2707 // a pointer to an appropriately qualified version of the *composite* 2708 // type. 2709 // FIXME: Need to calculate the composite type. 2710 // FIXME: Need to add qualifiers 2711 ImpCastExprToType(LHS, compositeType); 2712 ImpCastExprToType(RHS, compositeType); 2713 return compositeType; 2714 } 2715 } 2716 2717 // Selection between block pointer types is ok as long as they are the same. 2718 if (LHSTy->isBlockPointerType() && RHSTy->isBlockPointerType() && 2719 Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) 2720 return LHSTy; 2721 2722 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2723 // evaluates to "struct objc_object *" (and is handled above when comparing 2724 // id with statically typed objects). 2725 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 2726 // GCC allows qualified id and any Objective-C type to devolve to 2727 // id. Currently localizing to here until clear this should be 2728 // part of ObjCQualifiedIdTypesAreCompatible. 2729 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 2730 (LHSTy->isObjCQualifiedIdType() && 2731 Context.isObjCObjectPointerType(RHSTy)) || 2732 (RHSTy->isObjCQualifiedIdType() && 2733 Context.isObjCObjectPointerType(LHSTy))) { 2734 // FIXME: This is not the correct composite type. This only 2735 // happens to work because id can more or less be used anywhere, 2736 // however this may change the type of method sends. 2737 // FIXME: gcc adds some type-checking of the arguments and emits 2738 // (confusing) incompatible comparison warnings in some 2739 // cases. Investigate. 2740 QualType compositeType = Context.getObjCIdType(); 2741 ImpCastExprToType(LHS, compositeType); 2742 ImpCastExprToType(RHS, compositeType); 2743 return compositeType; 2744 } 2745 } 2746 2747 // Otherwise, the operands are not compatible. 2748 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2749 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2750 return QualType(); 2751} 2752 2753/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2754/// in the case of a the GNU conditional expr extension. 2755Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2756 SourceLocation ColonLoc, 2757 ExprArg Cond, ExprArg LHS, 2758 ExprArg RHS) { 2759 Expr *CondExpr = (Expr *) Cond.get(); 2760 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2761 2762 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2763 // was the condition. 2764 bool isLHSNull = LHSExpr == 0; 2765 if (isLHSNull) 2766 LHSExpr = CondExpr; 2767 2768 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2769 RHSExpr, QuestionLoc); 2770 if (result.isNull()) 2771 return ExprError(); 2772 2773 Cond.release(); 2774 LHS.release(); 2775 RHS.release(); 2776 return Owned(new (Context) ConditionalOperator(CondExpr, 2777 isLHSNull ? 0 : LHSExpr, 2778 RHSExpr, result)); 2779} 2780 2781 2782// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2783// being closely modeled after the C99 spec:-). The odd characteristic of this 2784// routine is it effectively iqnores the qualifiers on the top level pointee. 2785// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2786// FIXME: add a couple examples in this comment. 2787Sema::AssignConvertType 2788Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2789 QualType lhptee, rhptee; 2790 2791 // get the "pointed to" type (ignoring qualifiers at the top level) 2792 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2793 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2794 2795 // make sure we operate on the canonical type 2796 lhptee = Context.getCanonicalType(lhptee); 2797 rhptee = Context.getCanonicalType(rhptee); 2798 2799 AssignConvertType ConvTy = Compatible; 2800 2801 // C99 6.5.16.1p1: This following citation is common to constraints 2802 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2803 // qualifiers of the type *pointed to* by the right; 2804 // FIXME: Handle ExtQualType 2805 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2806 ConvTy = CompatiblePointerDiscardsQualifiers; 2807 2808 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2809 // incomplete type and the other is a pointer to a qualified or unqualified 2810 // version of void... 2811 if (lhptee->isVoidType()) { 2812 if (rhptee->isIncompleteOrObjectType()) 2813 return ConvTy; 2814 2815 // As an extension, we allow cast to/from void* to function pointer. 2816 assert(rhptee->isFunctionType()); 2817 return FunctionVoidPointer; 2818 } 2819 2820 if (rhptee->isVoidType()) { 2821 if (lhptee->isIncompleteOrObjectType()) 2822 return ConvTy; 2823 2824 // As an extension, we allow cast to/from void* to function pointer. 2825 assert(lhptee->isFunctionType()); 2826 return FunctionVoidPointer; 2827 } 2828 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2829 // unqualified versions of compatible types, ... 2830 lhptee = lhptee.getUnqualifiedType(); 2831 rhptee = rhptee.getUnqualifiedType(); 2832 if (!Context.typesAreCompatible(lhptee, rhptee)) { 2833 // Check if the pointee types are compatible ignoring the sign. 2834 // We explicitly check for char so that we catch "char" vs 2835 // "unsigned char" on systems where "char" is unsigned. 2836 if (lhptee->isCharType()) { 2837 lhptee = Context.UnsignedCharTy; 2838 } else if (lhptee->isSignedIntegerType()) { 2839 lhptee = Context.getCorrespondingUnsignedType(lhptee); 2840 } 2841 if (rhptee->isCharType()) { 2842 rhptee = Context.UnsignedCharTy; 2843 } else if (rhptee->isSignedIntegerType()) { 2844 rhptee = Context.getCorrespondingUnsignedType(rhptee); 2845 } 2846 if (lhptee == rhptee) { 2847 // Types are compatible ignoring the sign. Qualifier incompatibility 2848 // takes priority over sign incompatibility because the sign 2849 // warning can be disabled. 2850 if (ConvTy != Compatible) 2851 return ConvTy; 2852 return IncompatiblePointerSign; 2853 } 2854 // General pointer incompatibility takes priority over qualifiers. 2855 return IncompatiblePointer; 2856 } 2857 return ConvTy; 2858} 2859 2860/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2861/// block pointer types are compatible or whether a block and normal pointer 2862/// are compatible. It is more restrict than comparing two function pointer 2863// types. 2864Sema::AssignConvertType 2865Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2866 QualType rhsType) { 2867 QualType lhptee, rhptee; 2868 2869 // get the "pointed to" type (ignoring qualifiers at the top level) 2870 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2871 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2872 2873 // make sure we operate on the canonical type 2874 lhptee = Context.getCanonicalType(lhptee); 2875 rhptee = Context.getCanonicalType(rhptee); 2876 2877 AssignConvertType ConvTy = Compatible; 2878 2879 // For blocks we enforce that qualifiers are identical. 2880 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2881 ConvTy = CompatiblePointerDiscardsQualifiers; 2882 2883 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2884 return IncompatibleBlockPointer; 2885 return ConvTy; 2886} 2887 2888/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2889/// has code to accommodate several GCC extensions when type checking 2890/// pointers. Here are some objectionable examples that GCC considers warnings: 2891/// 2892/// int a, *pint; 2893/// short *pshort; 2894/// struct foo *pfoo; 2895/// 2896/// pint = pshort; // warning: assignment from incompatible pointer type 2897/// a = pint; // warning: assignment makes integer from pointer without a cast 2898/// pint = a; // warning: assignment makes pointer from integer without a cast 2899/// pint = pfoo; // warning: assignment from incompatible pointer type 2900/// 2901/// As a result, the code for dealing with pointers is more complex than the 2902/// C99 spec dictates. 2903/// 2904Sema::AssignConvertType 2905Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2906 // Get canonical types. We're not formatting these types, just comparing 2907 // them. 2908 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2909 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2910 2911 if (lhsType == rhsType) 2912 return Compatible; // Common case: fast path an exact match. 2913 2914 // If the left-hand side is a reference type, then we are in a 2915 // (rare!) case where we've allowed the use of references in C, 2916 // e.g., as a parameter type in a built-in function. In this case, 2917 // just make sure that the type referenced is compatible with the 2918 // right-hand side type. The caller is responsible for adjusting 2919 // lhsType so that the resulting expression does not have reference 2920 // type. 2921 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2922 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2923 return Compatible; 2924 return Incompatible; 2925 } 2926 2927 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 2928 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 2929 return Compatible; 2930 // Relax integer conversions like we do for pointers below. 2931 if (rhsType->isIntegerType()) 2932 return IntToPointer; 2933 if (lhsType->isIntegerType()) 2934 return PointerToInt; 2935 return IncompatibleObjCQualifiedId; 2936 } 2937 2938 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2939 // For ExtVector, allow vector splats; float -> <n x float> 2940 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2941 if (LV->getElementType() == rhsType) 2942 return Compatible; 2943 2944 // If we are allowing lax vector conversions, and LHS and RHS are both 2945 // vectors, the total size only needs to be the same. This is a bitcast; 2946 // no bits are changed but the result type is different. 2947 if (getLangOptions().LaxVectorConversions && 2948 lhsType->isVectorType() && rhsType->isVectorType()) { 2949 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2950 return IncompatibleVectors; 2951 } 2952 return Incompatible; 2953 } 2954 2955 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2956 return Compatible; 2957 2958 if (isa<PointerType>(lhsType)) { 2959 if (rhsType->isIntegerType()) 2960 return IntToPointer; 2961 2962 if (isa<PointerType>(rhsType)) 2963 return CheckPointerTypesForAssignment(lhsType, rhsType); 2964 2965 if (rhsType->getAsBlockPointerType()) { 2966 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2967 return Compatible; 2968 2969 // Treat block pointers as objects. 2970 if (getLangOptions().ObjC1 && 2971 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2972 return Compatible; 2973 } 2974 return Incompatible; 2975 } 2976 2977 if (isa<BlockPointerType>(lhsType)) { 2978 if (rhsType->isIntegerType()) 2979 return IntToBlockPointer; 2980 2981 // Treat block pointers as objects. 2982 if (getLangOptions().ObjC1 && 2983 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2984 return Compatible; 2985 2986 if (rhsType->isBlockPointerType()) 2987 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2988 2989 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2990 if (RHSPT->getPointeeType()->isVoidType()) 2991 return Compatible; 2992 } 2993 return Incompatible; 2994 } 2995 2996 if (isa<PointerType>(rhsType)) { 2997 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2998 if (lhsType == Context.BoolTy) 2999 return Compatible; 3000 3001 if (lhsType->isIntegerType()) 3002 return PointerToInt; 3003 3004 if (isa<PointerType>(lhsType)) 3005 return CheckPointerTypesForAssignment(lhsType, rhsType); 3006 3007 if (isa<BlockPointerType>(lhsType) && 3008 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 3009 return Compatible; 3010 return Incompatible; 3011 } 3012 3013 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 3014 if (Context.typesAreCompatible(lhsType, rhsType)) 3015 return Compatible; 3016 } 3017 return Incompatible; 3018} 3019 3020Sema::AssignConvertType 3021Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 3022 if (getLangOptions().CPlusPlus) { 3023 if (!lhsType->isRecordType()) { 3024 // C++ 5.17p3: If the left operand is not of class type, the 3025 // expression is implicitly converted (C++ 4) to the 3026 // cv-unqualified type of the left operand. 3027 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3028 "assigning")) 3029 return Incompatible; 3030 else 3031 return Compatible; 3032 } 3033 3034 // FIXME: Currently, we fall through and treat C++ classes like C 3035 // structures. 3036 } 3037 3038 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3039 // a null pointer constant. 3040 if ((lhsType->isPointerType() || 3041 lhsType->isObjCQualifiedIdType() || 3042 lhsType->isBlockPointerType()) 3043 && rExpr->isNullPointerConstant(Context)) { 3044 ImpCastExprToType(rExpr, lhsType); 3045 return Compatible; 3046 } 3047 3048 // This check seems unnatural, however it is necessary to ensure the proper 3049 // conversion of functions/arrays. If the conversion were done for all 3050 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3051 // expressions that surpress this implicit conversion (&, sizeof). 3052 // 3053 // Suppress this for references: C++ 8.5.3p5. 3054 if (!lhsType->isReferenceType()) 3055 DefaultFunctionArrayConversion(rExpr); 3056 3057 Sema::AssignConvertType result = 3058 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3059 3060 // C99 6.5.16.1p2: The value of the right operand is converted to the 3061 // type of the assignment expression. 3062 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3063 // so that we can use references in built-in functions even in C. 3064 // The getNonReferenceType() call makes sure that the resulting expression 3065 // does not have reference type. 3066 if (rExpr->getType() != lhsType) 3067 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3068 return result; 3069} 3070 3071Sema::AssignConvertType 3072Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 3073 return CheckAssignmentConstraints(lhsType, rhsType); 3074} 3075 3076QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3077 Diag(Loc, diag::err_typecheck_invalid_operands) 3078 << lex->getType() << rex->getType() 3079 << lex->getSourceRange() << rex->getSourceRange(); 3080 return QualType(); 3081} 3082 3083inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3084 Expr *&rex) { 3085 // For conversion purposes, we ignore any qualifiers. 3086 // For example, "const float" and "float" are equivalent. 3087 QualType lhsType = 3088 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3089 QualType rhsType = 3090 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3091 3092 // If the vector types are identical, return. 3093 if (lhsType == rhsType) 3094 return lhsType; 3095 3096 // Handle the case of a vector & extvector type of the same size and element 3097 // type. It would be nice if we only had one vector type someday. 3098 if (getLangOptions().LaxVectorConversions) { 3099 // FIXME: Should we warn here? 3100 if (const VectorType *LV = lhsType->getAsVectorType()) { 3101 if (const VectorType *RV = rhsType->getAsVectorType()) 3102 if (LV->getElementType() == RV->getElementType() && 3103 LV->getNumElements() == RV->getNumElements()) { 3104 return lhsType->isExtVectorType() ? lhsType : rhsType; 3105 } 3106 } 3107 } 3108 3109 // If the lhs is an extended vector and the rhs is a scalar of the same type 3110 // or a literal, promote the rhs to the vector type. 3111 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3112 QualType eltType = V->getElementType(); 3113 3114 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3115 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3116 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3117 ImpCastExprToType(rex, lhsType); 3118 return lhsType; 3119 } 3120 } 3121 3122 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3123 // promote the lhs to the vector type. 3124 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3125 QualType eltType = V->getElementType(); 3126 3127 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3128 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3129 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3130 ImpCastExprToType(lex, rhsType); 3131 return rhsType; 3132 } 3133 } 3134 3135 // You cannot convert between vector values of different size. 3136 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3137 << lex->getType() << rex->getType() 3138 << lex->getSourceRange() << rex->getSourceRange(); 3139 return QualType(); 3140} 3141 3142inline QualType Sema::CheckMultiplyDivideOperands( 3143 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3144{ 3145 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3146 return CheckVectorOperands(Loc, lex, rex); 3147 3148 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3149 3150 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3151 return compType; 3152 return InvalidOperands(Loc, lex, rex); 3153} 3154 3155inline QualType Sema::CheckRemainderOperands( 3156 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3157{ 3158 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3159 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3160 return CheckVectorOperands(Loc, lex, rex); 3161 return InvalidOperands(Loc, lex, rex); 3162 } 3163 3164 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3165 3166 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3167 return compType; 3168 return InvalidOperands(Loc, lex, rex); 3169} 3170 3171inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3172 Expr *&lex, Expr *&rex, SourceLocation Loc, QualType* CompLHSTy) 3173{ 3174 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3175 QualType compType = CheckVectorOperands(Loc, lex, rex); 3176 if (CompLHSTy) *CompLHSTy = compType; 3177 return compType; 3178 } 3179 3180 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3181 3182 // handle the common case first (both operands are arithmetic). 3183 if (lex->getType()->isArithmeticType() && 3184 rex->getType()->isArithmeticType()) { 3185 if (CompLHSTy) *CompLHSTy = compType; 3186 return compType; 3187 } 3188 3189 // Put any potential pointer into PExp 3190 Expr* PExp = lex, *IExp = rex; 3191 if (IExp->getType()->isPointerType()) 3192 std::swap(PExp, IExp); 3193 3194 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 3195 if (IExp->getType()->isIntegerType()) { 3196 // Check for arithmetic on pointers to incomplete types 3197 if (PTy->getPointeeType()->isVoidType()) { 3198 if (getLangOptions().CPlusPlus) { 3199 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3200 << lex->getSourceRange() << rex->getSourceRange(); 3201 return QualType(); 3202 } 3203 3204 // GNU extension: arithmetic on pointer to void 3205 Diag(Loc, diag::ext_gnu_void_ptr) 3206 << lex->getSourceRange() << rex->getSourceRange(); 3207 } else if (PTy->getPointeeType()->isFunctionType()) { 3208 if (getLangOptions().CPlusPlus) { 3209 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3210 << lex->getType() << lex->getSourceRange(); 3211 return QualType(); 3212 } 3213 3214 // GNU extension: arithmetic on pointer to function 3215 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3216 << lex->getType() << lex->getSourceRange(); 3217 } else if (!PTy->isDependentType() && 3218 RequireCompleteType(Loc, PTy->getPointeeType(), 3219 diag::err_typecheck_arithmetic_incomplete_type, 3220 lex->getSourceRange(), SourceRange(), 3221 lex->getType())) 3222 return QualType(); 3223 3224 if (CompLHSTy) { 3225 QualType LHSTy = lex->getType(); 3226 if (LHSTy->isPromotableIntegerType()) 3227 LHSTy = Context.IntTy; 3228 *CompLHSTy = LHSTy; 3229 } 3230 return PExp->getType(); 3231 } 3232 } 3233 3234 return InvalidOperands(Loc, lex, rex); 3235} 3236 3237// C99 6.5.6 3238QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3239 SourceLocation Loc, QualType* CompLHSTy) { 3240 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3241 QualType compType = CheckVectorOperands(Loc, lex, rex); 3242 if (CompLHSTy) *CompLHSTy = compType; 3243 return compType; 3244 } 3245 3246 QualType compType = UsualArithmeticConversions(lex, rex, CompLHSTy); 3247 3248 // Enforce type constraints: C99 6.5.6p3. 3249 3250 // Handle the common case first (both operands are arithmetic). 3251 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) { 3252 if (CompLHSTy) *CompLHSTy = compType; 3253 return compType; 3254 } 3255 3256 // Either ptr - int or ptr - ptr. 3257 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3258 QualType lpointee = LHSPTy->getPointeeType(); 3259 3260 // The LHS must be an completely-defined object type. 3261 3262 bool ComplainAboutVoid = false; 3263 Expr *ComplainAboutFunc = 0; 3264 if (lpointee->isVoidType()) { 3265 if (getLangOptions().CPlusPlus) { 3266 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3267 << lex->getSourceRange() << rex->getSourceRange(); 3268 return QualType(); 3269 } 3270 3271 // GNU C extension: arithmetic on pointer to void 3272 ComplainAboutVoid = true; 3273 } else if (lpointee->isFunctionType()) { 3274 if (getLangOptions().CPlusPlus) { 3275 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3276 << lex->getType() << lex->getSourceRange(); 3277 return QualType(); 3278 } 3279 3280 // GNU C extension: arithmetic on pointer to function 3281 ComplainAboutFunc = lex; 3282 } else if (!lpointee->isDependentType() && 3283 RequireCompleteType(Loc, lpointee, 3284 diag::err_typecheck_sub_ptr_object, 3285 lex->getSourceRange(), 3286 SourceRange(), 3287 lex->getType())) 3288 return QualType(); 3289 3290 // The result type of a pointer-int computation is the pointer type. 3291 if (rex->getType()->isIntegerType()) { 3292 if (ComplainAboutVoid) 3293 Diag(Loc, diag::ext_gnu_void_ptr) 3294 << lex->getSourceRange() << rex->getSourceRange(); 3295 if (ComplainAboutFunc) 3296 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3297 << ComplainAboutFunc->getType() 3298 << ComplainAboutFunc->getSourceRange(); 3299 3300 if (CompLHSTy) *CompLHSTy = lex->getType(); 3301 return lex->getType(); 3302 } 3303 3304 // Handle pointer-pointer subtractions. 3305 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3306 QualType rpointee = RHSPTy->getPointeeType(); 3307 3308 // RHS must be a completely-type object type. 3309 // Handle the GNU void* extension. 3310 if (rpointee->isVoidType()) { 3311 if (getLangOptions().CPlusPlus) { 3312 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3313 << lex->getSourceRange() << rex->getSourceRange(); 3314 return QualType(); 3315 } 3316 3317 ComplainAboutVoid = true; 3318 } else if (rpointee->isFunctionType()) { 3319 if (getLangOptions().CPlusPlus) { 3320 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3321 << rex->getType() << rex->getSourceRange(); 3322 return QualType(); 3323 } 3324 3325 // GNU extension: arithmetic on pointer to function 3326 if (!ComplainAboutFunc) 3327 ComplainAboutFunc = rex; 3328 } else if (!rpointee->isDependentType() && 3329 RequireCompleteType(Loc, rpointee, 3330 diag::err_typecheck_sub_ptr_object, 3331 rex->getSourceRange(), 3332 SourceRange(), 3333 rex->getType())) 3334 return QualType(); 3335 3336 // Pointee types must be compatible. 3337 if (!Context.typesAreCompatible( 3338 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3339 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3340 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3341 << lex->getType() << rex->getType() 3342 << lex->getSourceRange() << rex->getSourceRange(); 3343 return QualType(); 3344 } 3345 3346 if (ComplainAboutVoid) 3347 Diag(Loc, diag::ext_gnu_void_ptr) 3348 << lex->getSourceRange() << rex->getSourceRange(); 3349 if (ComplainAboutFunc) 3350 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3351 << ComplainAboutFunc->getType() 3352 << ComplainAboutFunc->getSourceRange(); 3353 3354 if (CompLHSTy) *CompLHSTy = lex->getType(); 3355 return Context.getPointerDiffType(); 3356 } 3357 } 3358 3359 return InvalidOperands(Loc, lex, rex); 3360} 3361 3362// C99 6.5.7 3363QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3364 bool isCompAssign) { 3365 // C99 6.5.7p2: Each of the operands shall have integer type. 3366 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3367 return InvalidOperands(Loc, lex, rex); 3368 3369 // Shifts don't perform usual arithmetic conversions, they just do integer 3370 // promotions on each operand. C99 6.5.7p3 3371 QualType LHSTy; 3372 if (lex->getType()->isPromotableIntegerType()) 3373 LHSTy = Context.IntTy; 3374 else 3375 LHSTy = lex->getType(); 3376 if (!isCompAssign) 3377 ImpCastExprToType(lex, LHSTy); 3378 3379 UsualUnaryConversions(rex); 3380 3381 // "The type of the result is that of the promoted left operand." 3382 return LHSTy; 3383} 3384 3385// C99 6.5.8 3386QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3387 unsigned OpaqueOpc, bool isRelational) { 3388 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)OpaqueOpc; 3389 3390 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3391 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3392 3393 // C99 6.5.8p3 / C99 6.5.9p4 3394 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3395 UsualArithmeticConversions(lex, rex); 3396 else { 3397 UsualUnaryConversions(lex); 3398 UsualUnaryConversions(rex); 3399 } 3400 QualType lType = lex->getType(); 3401 QualType rType = rex->getType(); 3402 3403 if (!lType->isFloatingType()) { 3404 // For non-floating point types, check for self-comparisons of the form 3405 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3406 // often indicate logic errors in the program. 3407 // NOTE: Don't warn about comparisons of enum constants. These can arise 3408 // from macro expansions, and are usually quite deliberate. 3409 Expr *LHSStripped = lex->IgnoreParens(); 3410 Expr *RHSStripped = rex->IgnoreParens(); 3411 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3412 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3413 if (DRL->getDecl() == DRR->getDecl() && 3414 !isa<EnumConstantDecl>(DRL->getDecl())) 3415 Diag(Loc, diag::warn_selfcomparison); 3416 3417 if (isa<CastExpr>(LHSStripped)) 3418 LHSStripped = LHSStripped->IgnoreParenCasts(); 3419 if (isa<CastExpr>(RHSStripped)) 3420 RHSStripped = RHSStripped->IgnoreParenCasts(); 3421 3422 // Warn about comparisons against a string constant (unless the other 3423 // operand is null), the user probably wants strcmp. 3424 Expr *literalString = 0; 3425 Expr *literalStringStripped = 0; 3426 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3427 !RHSStripped->isNullPointerConstant(Context)) { 3428 literalString = lex; 3429 literalStringStripped = LHSStripped; 3430 } 3431 else if ((isa<StringLiteral>(RHSStripped) || 3432 isa<ObjCEncodeExpr>(RHSStripped)) && 3433 !LHSStripped->isNullPointerConstant(Context)) { 3434 literalString = rex; 3435 literalStringStripped = RHSStripped; 3436 } 3437 3438 if (literalString) { 3439 std::string resultComparison; 3440 switch (Opc) { 3441 case BinaryOperator::LT: resultComparison = ") < 0"; break; 3442 case BinaryOperator::GT: resultComparison = ") > 0"; break; 3443 case BinaryOperator::LE: resultComparison = ") <= 0"; break; 3444 case BinaryOperator::GE: resultComparison = ") >= 0"; break; 3445 case BinaryOperator::EQ: resultComparison = ") == 0"; break; 3446 case BinaryOperator::NE: resultComparison = ") != 0"; break; 3447 default: assert(false && "Invalid comparison operator"); 3448 } 3449 Diag(Loc, diag::warn_stringcompare) 3450 << isa<ObjCEncodeExpr>(literalStringStripped) 3451 << literalString->getSourceRange() 3452 << CodeModificationHint::CreateReplacement(SourceRange(Loc), ", ") 3453 << CodeModificationHint::CreateInsertion(lex->getLocStart(), 3454 "strcmp(") 3455 << CodeModificationHint::CreateInsertion( 3456 PP.getLocForEndOfToken(rex->getLocEnd()), 3457 resultComparison); 3458 } 3459 } 3460 3461 // The result of comparisons is 'bool' in C++, 'int' in C. 3462 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3463 3464 if (isRelational) { 3465 if (lType->isRealType() && rType->isRealType()) 3466 return ResultTy; 3467 } else { 3468 // Check for comparisons of floating point operands using != and ==. 3469 if (lType->isFloatingType()) { 3470 assert(rType->isFloatingType()); 3471 CheckFloatComparison(Loc,lex,rex); 3472 } 3473 3474 if (lType->isArithmeticType() && rType->isArithmeticType()) 3475 return ResultTy; 3476 } 3477 3478 bool LHSIsNull = lex->isNullPointerConstant(Context); 3479 bool RHSIsNull = rex->isNullPointerConstant(Context); 3480 3481 // All of the following pointer related warnings are GCC extensions, except 3482 // when handling null pointer constants. One day, we can consider making them 3483 // errors (when -pedantic-errors is enabled). 3484 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3485 QualType LCanPointeeTy = 3486 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3487 QualType RCanPointeeTy = 3488 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3489 3490 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3491 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3492 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3493 RCanPointeeTy.getUnqualifiedType()) && 3494 !Context.areComparableObjCPointerTypes(lType, rType)) { 3495 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3496 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3497 } 3498 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3499 return ResultTy; 3500 } 3501 // Handle block pointer types. 3502 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 3503 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3504 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3505 3506 if (!LHSIsNull && !RHSIsNull && 3507 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3508 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3509 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3510 } 3511 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3512 return ResultTy; 3513 } 3514 // Allow block pointers to be compared with null pointer constants. 3515 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3516 (lType->isPointerType() && rType->isBlockPointerType())) { 3517 if (!LHSIsNull && !RHSIsNull) { 3518 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3519 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3520 } 3521 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3522 return ResultTy; 3523 } 3524 3525 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3526 if (lType->isPointerType() || rType->isPointerType()) { 3527 const PointerType *LPT = lType->getAsPointerType(); 3528 const PointerType *RPT = rType->getAsPointerType(); 3529 bool LPtrToVoid = LPT ? 3530 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3531 bool RPtrToVoid = RPT ? 3532 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3533 3534 if (!LPtrToVoid && !RPtrToVoid && 3535 !Context.typesAreCompatible(lType, rType)) { 3536 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3537 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3538 ImpCastExprToType(rex, lType); 3539 return ResultTy; 3540 } 3541 ImpCastExprToType(rex, lType); 3542 return ResultTy; 3543 } 3544 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3545 ImpCastExprToType(rex, lType); 3546 return ResultTy; 3547 } else { 3548 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3549 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3550 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3551 ImpCastExprToType(rex, lType); 3552 return ResultTy; 3553 } 3554 } 3555 } 3556 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3557 rType->isIntegerType()) { 3558 if (!RHSIsNull) 3559 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3560 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3561 ImpCastExprToType(rex, lType); // promote the integer to pointer 3562 return ResultTy; 3563 } 3564 if (lType->isIntegerType() && 3565 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3566 if (!LHSIsNull) 3567 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3568 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3569 ImpCastExprToType(lex, rType); // promote the integer to pointer 3570 return ResultTy; 3571 } 3572 // Handle block pointers. 3573 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3574 if (!RHSIsNull) 3575 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3576 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3577 ImpCastExprToType(rex, lType); // promote the integer to pointer 3578 return ResultTy; 3579 } 3580 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3581 if (!LHSIsNull) 3582 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3583 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3584 ImpCastExprToType(lex, rType); // promote the integer to pointer 3585 return ResultTy; 3586 } 3587 return InvalidOperands(Loc, lex, rex); 3588} 3589 3590/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3591/// operates on extended vector types. Instead of producing an IntTy result, 3592/// like a scalar comparison, a vector comparison produces a vector of integer 3593/// types. 3594QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3595 SourceLocation Loc, 3596 bool isRelational) { 3597 // Check to make sure we're operating on vectors of the same type and width, 3598 // Allowing one side to be a scalar of element type. 3599 QualType vType = CheckVectorOperands(Loc, lex, rex); 3600 if (vType.isNull()) 3601 return vType; 3602 3603 QualType lType = lex->getType(); 3604 QualType rType = rex->getType(); 3605 3606 // For non-floating point types, check for self-comparisons of the form 3607 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3608 // often indicate logic errors in the program. 3609 if (!lType->isFloatingType()) { 3610 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3611 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3612 if (DRL->getDecl() == DRR->getDecl()) 3613 Diag(Loc, diag::warn_selfcomparison); 3614 } 3615 3616 // Check for comparisons of floating point operands using != and ==. 3617 if (!isRelational && lType->isFloatingType()) { 3618 assert (rType->isFloatingType()); 3619 CheckFloatComparison(Loc,lex,rex); 3620 } 3621 3622 // FIXME: Vector compare support in the LLVM backend is not fully reliable, 3623 // just reject all vector comparisons for now. 3624 if (1) { 3625 Diag(Loc, diag::err_typecheck_vector_comparison) 3626 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3627 return QualType(); 3628 } 3629 3630 // Return the type for the comparison, which is the same as vector type for 3631 // integer vectors, or an integer type of identical size and number of 3632 // elements for floating point vectors. 3633 if (lType->isIntegerType()) 3634 return lType; 3635 3636 const VectorType *VTy = lType->getAsVectorType(); 3637 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3638 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3639 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3640 if (TypeSize == Context.getTypeSize(Context.LongTy)) 3641 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3642 3643 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3644 "Unhandled vector element size in vector compare"); 3645 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3646} 3647 3648inline QualType Sema::CheckBitwiseOperands( 3649 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3650{ 3651 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3652 return CheckVectorOperands(Loc, lex, rex); 3653 3654 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3655 3656 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3657 return compType; 3658 return InvalidOperands(Loc, lex, rex); 3659} 3660 3661inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3662 Expr *&lex, Expr *&rex, SourceLocation Loc) 3663{ 3664 UsualUnaryConversions(lex); 3665 UsualUnaryConversions(rex); 3666 3667 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3668 return Context.IntTy; 3669 return InvalidOperands(Loc, lex, rex); 3670} 3671 3672/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3673/// is a read-only property; return true if so. A readonly property expression 3674/// depends on various declarations and thus must be treated specially. 3675/// 3676static bool IsReadonlyProperty(Expr *E, Sema &S) 3677{ 3678 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3679 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3680 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3681 QualType BaseType = PropExpr->getBase()->getType(); 3682 if (const PointerType *PTy = BaseType->getAsPointerType()) 3683 if (const ObjCInterfaceType *IFTy = 3684 PTy->getPointeeType()->getAsObjCInterfaceType()) 3685 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3686 if (S.isPropertyReadonly(PDecl, IFace)) 3687 return true; 3688 } 3689 } 3690 return false; 3691} 3692 3693/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3694/// emit an error and return true. If so, return false. 3695static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3696 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 3697 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3698 IsLV = Expr::MLV_ReadonlyProperty; 3699 if (IsLV == Expr::MLV_Valid) 3700 return false; 3701 3702 unsigned Diag = 0; 3703 bool NeedType = false; 3704 switch (IsLV) { // C99 6.5.16p2 3705 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3706 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3707 case Expr::MLV_ArrayType: 3708 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3709 NeedType = true; 3710 break; 3711 case Expr::MLV_NotObjectType: 3712 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3713 NeedType = true; 3714 break; 3715 case Expr::MLV_LValueCast: 3716 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3717 break; 3718 case Expr::MLV_InvalidExpression: 3719 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3720 break; 3721 case Expr::MLV_IncompleteType: 3722 case Expr::MLV_IncompleteVoidType: 3723 return S.RequireCompleteType(Loc, E->getType(), 3724 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3725 E->getSourceRange()); 3726 case Expr::MLV_DuplicateVectorComponents: 3727 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 3728 break; 3729 case Expr::MLV_NotBlockQualified: 3730 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 3731 break; 3732 case Expr::MLV_ReadonlyProperty: 3733 Diag = diag::error_readonly_property_assignment; 3734 break; 3735 case Expr::MLV_NoSetterProperty: 3736 Diag = diag::error_nosetter_property_assignment; 3737 break; 3738 } 3739 3740 if (NeedType) 3741 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 3742 else 3743 S.Diag(Loc, Diag) << E->getSourceRange(); 3744 return true; 3745} 3746 3747 3748 3749// C99 6.5.16.1 3750QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 3751 SourceLocation Loc, 3752 QualType CompoundType) { 3753 // Verify that LHS is a modifiable lvalue, and emit error if not. 3754 if (CheckForModifiableLvalue(LHS, Loc, *this)) 3755 return QualType(); 3756 3757 QualType LHSType = LHS->getType(); 3758 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 3759 3760 AssignConvertType ConvTy; 3761 if (CompoundType.isNull()) { 3762 // Simple assignment "x = y". 3763 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 3764 // Special case of NSObject attributes on c-style pointer types. 3765 if (ConvTy == IncompatiblePointer && 3766 ((Context.isObjCNSObjectType(LHSType) && 3767 Context.isObjCObjectPointerType(RHSType)) || 3768 (Context.isObjCNSObjectType(RHSType) && 3769 Context.isObjCObjectPointerType(LHSType)))) 3770 ConvTy = Compatible; 3771 3772 // If the RHS is a unary plus or minus, check to see if they = and + are 3773 // right next to each other. If so, the user may have typo'd "x =+ 4" 3774 // instead of "x += 4". 3775 Expr *RHSCheck = RHS; 3776 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 3777 RHSCheck = ICE->getSubExpr(); 3778 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 3779 if ((UO->getOpcode() == UnaryOperator::Plus || 3780 UO->getOpcode() == UnaryOperator::Minus) && 3781 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 3782 // Only if the two operators are exactly adjacent. 3783 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 3784 // And there is a space or other character before the subexpr of the 3785 // unary +/-. We don't want to warn on "x=-1". 3786 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 3787 UO->getSubExpr()->getLocStart().isFileID()) { 3788 Diag(Loc, diag::warn_not_compound_assign) 3789 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 3790 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 3791 } 3792 } 3793 } else { 3794 // Compound assignment "x += y" 3795 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 3796 } 3797 3798 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 3799 RHS, "assigning")) 3800 return QualType(); 3801 3802 // C99 6.5.16p3: The type of an assignment expression is the type of the 3803 // left operand unless the left operand has qualified type, in which case 3804 // it is the unqualified version of the type of the left operand. 3805 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 3806 // is converted to the type of the assignment expression (above). 3807 // C++ 5.17p1: the type of the assignment expression is that of its left 3808 // oprdu. 3809 return LHSType.getUnqualifiedType(); 3810} 3811 3812// C99 6.5.17 3813QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 3814 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 3815 DefaultFunctionArrayConversion(RHS); 3816 3817 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 3818 // incomplete in C++). 3819 3820 return RHS->getType(); 3821} 3822 3823/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 3824/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 3825QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 3826 bool isInc) { 3827 if (Op->isTypeDependent()) 3828 return Context.DependentTy; 3829 3830 QualType ResType = Op->getType(); 3831 assert(!ResType.isNull() && "no type for increment/decrement expression"); 3832 3833 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 3834 // Decrement of bool is not allowed. 3835 if (!isInc) { 3836 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 3837 return QualType(); 3838 } 3839 // Increment of bool sets it to true, but is deprecated. 3840 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 3841 } else if (ResType->isRealType()) { 3842 // OK! 3843 } else if (const PointerType *PT = ResType->getAsPointerType()) { 3844 // C99 6.5.2.4p2, 6.5.6p2 3845 if (PT->getPointeeType()->isVoidType()) { 3846 if (getLangOptions().CPlusPlus) { 3847 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 3848 << Op->getSourceRange(); 3849 return QualType(); 3850 } 3851 3852 // Pointer to void is a GNU extension in C. 3853 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 3854 } else if (PT->getPointeeType()->isFunctionType()) { 3855 if (getLangOptions().CPlusPlus) { 3856 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 3857 << Op->getType() << Op->getSourceRange(); 3858 return QualType(); 3859 } 3860 3861 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 3862 << ResType << Op->getSourceRange(); 3863 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 3864 diag::err_typecheck_arithmetic_incomplete_type, 3865 Op->getSourceRange(), SourceRange(), 3866 ResType)) 3867 return QualType(); 3868 } else if (ResType->isComplexType()) { 3869 // C99 does not support ++/-- on complex types, we allow as an extension. 3870 Diag(OpLoc, diag::ext_integer_increment_complex) 3871 << ResType << Op->getSourceRange(); 3872 } else { 3873 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 3874 << ResType << Op->getSourceRange(); 3875 return QualType(); 3876 } 3877 // At this point, we know we have a real, complex or pointer type. 3878 // Now make sure the operand is a modifiable lvalue. 3879 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 3880 return QualType(); 3881 return ResType; 3882} 3883 3884/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 3885/// This routine allows us to typecheck complex/recursive expressions 3886/// where the declaration is needed for type checking. We only need to 3887/// handle cases when the expression references a function designator 3888/// or is an lvalue. Here are some examples: 3889/// - &(x) => x 3890/// - &*****f => f for f a function designator. 3891/// - &s.xx => s 3892/// - &s.zz[1].yy -> s, if zz is an array 3893/// - *(x + 1) -> x, if x is an array 3894/// - &"123"[2] -> 0 3895/// - & __real__ x -> x 3896static NamedDecl *getPrimaryDecl(Expr *E) { 3897 switch (E->getStmtClass()) { 3898 case Stmt::DeclRefExprClass: 3899 case Stmt::QualifiedDeclRefExprClass: 3900 return cast<DeclRefExpr>(E)->getDecl(); 3901 case Stmt::MemberExprClass: 3902 // Fields cannot be declared with a 'register' storage class. 3903 // &X->f is always ok, even if X is declared register. 3904 if (cast<MemberExpr>(E)->isArrow()) 3905 return 0; 3906 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 3907 case Stmt::ArraySubscriptExprClass: { 3908 // &X[4] and &4[X] refers to X if X is not a pointer. 3909 3910 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 3911 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 3912 if (!VD || VD->getType()->isPointerType()) 3913 return 0; 3914 else 3915 return VD; 3916 } 3917 case Stmt::UnaryOperatorClass: { 3918 UnaryOperator *UO = cast<UnaryOperator>(E); 3919 3920 switch(UO->getOpcode()) { 3921 case UnaryOperator::Deref: { 3922 // *(X + 1) refers to X if X is not a pointer. 3923 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 3924 ValueDecl *VD = dyn_cast<ValueDecl>(D); 3925 if (!VD || VD->getType()->isPointerType()) 3926 return 0; 3927 return VD; 3928 } 3929 return 0; 3930 } 3931 case UnaryOperator::Real: 3932 case UnaryOperator::Imag: 3933 case UnaryOperator::Extension: 3934 return getPrimaryDecl(UO->getSubExpr()); 3935 default: 3936 return 0; 3937 } 3938 } 3939 case Stmt::BinaryOperatorClass: { 3940 BinaryOperator *BO = cast<BinaryOperator>(E); 3941 3942 // Handle cases involving pointer arithmetic. The result of an 3943 // Assign or AddAssign is not an lvalue so they can be ignored. 3944 3945 // (x + n) or (n + x) => x 3946 if (BO->getOpcode() == BinaryOperator::Add) { 3947 if (BO->getLHS()->getType()->isPointerType()) { 3948 return getPrimaryDecl(BO->getLHS()); 3949 } else if (BO->getRHS()->getType()->isPointerType()) { 3950 return getPrimaryDecl(BO->getRHS()); 3951 } 3952 } 3953 3954 return 0; 3955 } 3956 case Stmt::ParenExprClass: 3957 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 3958 case Stmt::ImplicitCastExprClass: 3959 // &X[4] when X is an array, has an implicit cast from array to pointer. 3960 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 3961 default: 3962 return 0; 3963 } 3964} 3965 3966/// CheckAddressOfOperand - The operand of & must be either a function 3967/// designator or an lvalue designating an object. If it is an lvalue, the 3968/// object cannot be declared with storage class register or be a bit field. 3969/// Note: The usual conversions are *not* applied to the operand of the & 3970/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 3971/// In C++, the operand might be an overloaded function name, in which case 3972/// we allow the '&' but retain the overloaded-function type. 3973QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 3974 if (op->isTypeDependent()) 3975 return Context.DependentTy; 3976 3977 if (getLangOptions().C99) { 3978 // Implement C99-only parts of addressof rules. 3979 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 3980 if (uOp->getOpcode() == UnaryOperator::Deref) 3981 // Per C99 6.5.3.2, the address of a deref always returns a valid result 3982 // (assuming the deref expression is valid). 3983 return uOp->getSubExpr()->getType(); 3984 } 3985 // Technically, there should be a check for array subscript 3986 // expressions here, but the result of one is always an lvalue anyway. 3987 } 3988 NamedDecl *dcl = getPrimaryDecl(op); 3989 Expr::isLvalueResult lval = op->isLvalue(Context); 3990 3991 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 3992 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 3993 // FIXME: emit more specific diag... 3994 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 3995 << op->getSourceRange(); 3996 return QualType(); 3997 } 3998 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 3999 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemExpr->getMemberDecl())) { 4000 if (Field->isBitField()) { 4001 Diag(OpLoc, diag::err_typecheck_address_of) 4002 << "bit-field" << op->getSourceRange(); 4003 return QualType(); 4004 } 4005 } 4006 // Check for Apple extension for accessing vector components. 4007 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 4008 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 4009 Diag(OpLoc, diag::err_typecheck_address_of) 4010 << "vector element" << op->getSourceRange(); 4011 return QualType(); 4012 } else if (dcl) { // C99 6.5.3.2p1 4013 // We have an lvalue with a decl. Make sure the decl is not declared 4014 // with the register storage-class specifier. 4015 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 4016 if (vd->getStorageClass() == VarDecl::Register) { 4017 Diag(OpLoc, diag::err_typecheck_address_of) 4018 << "register variable" << op->getSourceRange(); 4019 return QualType(); 4020 } 4021 } else if (isa<OverloadedFunctionDecl>(dcl)) { 4022 return Context.OverloadTy; 4023 } else if (isa<FieldDecl>(dcl)) { 4024 // Okay: we can take the address of a field. 4025 // Could be a pointer to member, though, if there is an explicit 4026 // scope qualifier for the class. 4027 if (isa<QualifiedDeclRefExpr>(op)) { 4028 DeclContext *Ctx = dcl->getDeclContext(); 4029 if (Ctx && Ctx->isRecord()) 4030 return Context.getMemberPointerType(op->getType(), 4031 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4032 } 4033 } else if (isa<FunctionDecl>(dcl)) { 4034 // Okay: we can take the address of a function. 4035 // As above. 4036 if (isa<QualifiedDeclRefExpr>(op)) { 4037 DeclContext *Ctx = dcl->getDeclContext(); 4038 if (Ctx && Ctx->isRecord()) 4039 return Context.getMemberPointerType(op->getType(), 4040 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 4041 } 4042 } 4043 else 4044 assert(0 && "Unknown/unexpected decl type"); 4045 } 4046 4047 // If the operand has type "type", the result has type "pointer to type". 4048 return Context.getPointerType(op->getType()); 4049} 4050 4051QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 4052 if (Op->isTypeDependent()) 4053 return Context.DependentTy; 4054 4055 UsualUnaryConversions(Op); 4056 QualType Ty = Op->getType(); 4057 4058 // Note that per both C89 and C99, this is always legal, even if ptype is an 4059 // incomplete type or void. It would be possible to warn about dereferencing 4060 // a void pointer, but it's completely well-defined, and such a warning is 4061 // unlikely to catch any mistakes. 4062 if (const PointerType *PT = Ty->getAsPointerType()) 4063 return PT->getPointeeType(); 4064 4065 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 4066 << Ty << Op->getSourceRange(); 4067 return QualType(); 4068} 4069 4070static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 4071 tok::TokenKind Kind) { 4072 BinaryOperator::Opcode Opc; 4073 switch (Kind) { 4074 default: assert(0 && "Unknown binop!"); 4075 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 4076 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 4077 case tok::star: Opc = BinaryOperator::Mul; break; 4078 case tok::slash: Opc = BinaryOperator::Div; break; 4079 case tok::percent: Opc = BinaryOperator::Rem; break; 4080 case tok::plus: Opc = BinaryOperator::Add; break; 4081 case tok::minus: Opc = BinaryOperator::Sub; break; 4082 case tok::lessless: Opc = BinaryOperator::Shl; break; 4083 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 4084 case tok::lessequal: Opc = BinaryOperator::LE; break; 4085 case tok::less: Opc = BinaryOperator::LT; break; 4086 case tok::greaterequal: Opc = BinaryOperator::GE; break; 4087 case tok::greater: Opc = BinaryOperator::GT; break; 4088 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 4089 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4090 case tok::amp: Opc = BinaryOperator::And; break; 4091 case tok::caret: Opc = BinaryOperator::Xor; break; 4092 case tok::pipe: Opc = BinaryOperator::Or; break; 4093 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4094 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4095 case tok::equal: Opc = BinaryOperator::Assign; break; 4096 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4097 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4098 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4099 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4100 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4101 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4102 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4103 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4104 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4105 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4106 case tok::comma: Opc = BinaryOperator::Comma; break; 4107 } 4108 return Opc; 4109} 4110 4111static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4112 tok::TokenKind Kind) { 4113 UnaryOperator::Opcode Opc; 4114 switch (Kind) { 4115 default: assert(0 && "Unknown unary op!"); 4116 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4117 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4118 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4119 case tok::star: Opc = UnaryOperator::Deref; break; 4120 case tok::plus: Opc = UnaryOperator::Plus; break; 4121 case tok::minus: Opc = UnaryOperator::Minus; break; 4122 case tok::tilde: Opc = UnaryOperator::Not; break; 4123 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4124 case tok::kw___real: Opc = UnaryOperator::Real; break; 4125 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4126 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4127 } 4128 return Opc; 4129} 4130 4131/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4132/// operator @p Opc at location @c TokLoc. This routine only supports 4133/// built-in operations; ActOnBinOp handles overloaded operators. 4134Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4135 unsigned Op, 4136 Expr *lhs, Expr *rhs) { 4137 QualType ResultTy; // Result type of the binary operator. 4138 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4139 // The following two variables are used for compound assignment operators 4140 QualType CompLHSTy; // Type of LHS after promotions for computation 4141 QualType CompResultTy; // Type of computation result 4142 4143 switch (Opc) { 4144 case BinaryOperator::Assign: 4145 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4146 break; 4147 case BinaryOperator::PtrMemD: 4148 case BinaryOperator::PtrMemI: 4149 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4150 Opc == BinaryOperator::PtrMemI); 4151 break; 4152 case BinaryOperator::Mul: 4153 case BinaryOperator::Div: 4154 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4155 break; 4156 case BinaryOperator::Rem: 4157 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4158 break; 4159 case BinaryOperator::Add: 4160 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4161 break; 4162 case BinaryOperator::Sub: 4163 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4164 break; 4165 case BinaryOperator::Shl: 4166 case BinaryOperator::Shr: 4167 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4168 break; 4169 case BinaryOperator::LE: 4170 case BinaryOperator::LT: 4171 case BinaryOperator::GE: 4172 case BinaryOperator::GT: 4173 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, true); 4174 break; 4175 case BinaryOperator::EQ: 4176 case BinaryOperator::NE: 4177 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, Opc, false); 4178 break; 4179 case BinaryOperator::And: 4180 case BinaryOperator::Xor: 4181 case BinaryOperator::Or: 4182 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4183 break; 4184 case BinaryOperator::LAnd: 4185 case BinaryOperator::LOr: 4186 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4187 break; 4188 case BinaryOperator::MulAssign: 4189 case BinaryOperator::DivAssign: 4190 CompResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4191 CompLHSTy = CompResultTy; 4192 if (!CompResultTy.isNull()) 4193 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4194 break; 4195 case BinaryOperator::RemAssign: 4196 CompResultTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4197 CompLHSTy = CompResultTy; 4198 if (!CompResultTy.isNull()) 4199 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4200 break; 4201 case BinaryOperator::AddAssign: 4202 CompResultTy = CheckAdditionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4203 if (!CompResultTy.isNull()) 4204 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4205 break; 4206 case BinaryOperator::SubAssign: 4207 CompResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc, &CompLHSTy); 4208 if (!CompResultTy.isNull()) 4209 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4210 break; 4211 case BinaryOperator::ShlAssign: 4212 case BinaryOperator::ShrAssign: 4213 CompResultTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4214 CompLHSTy = CompResultTy; 4215 if (!CompResultTy.isNull()) 4216 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4217 break; 4218 case BinaryOperator::AndAssign: 4219 case BinaryOperator::XorAssign: 4220 case BinaryOperator::OrAssign: 4221 CompResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4222 CompLHSTy = CompResultTy; 4223 if (!CompResultTy.isNull()) 4224 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompResultTy); 4225 break; 4226 case BinaryOperator::Comma: 4227 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4228 break; 4229 } 4230 if (ResultTy.isNull()) 4231 return ExprError(); 4232 if (CompResultTy.isNull()) 4233 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4234 else 4235 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4236 CompLHSTy, CompResultTy, 4237 OpLoc)); 4238} 4239 4240// Binary Operators. 'Tok' is the token for the operator. 4241Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4242 tok::TokenKind Kind, 4243 ExprArg LHS, ExprArg RHS) { 4244 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4245 Expr *lhs = (Expr *)LHS.release(), *rhs = (Expr*)RHS.release(); 4246 4247 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4248 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4249 4250 if (getLangOptions().CPlusPlus && 4251 (lhs->getType()->isOverloadableType() || 4252 rhs->getType()->isOverloadableType())) { 4253 // Find all of the overloaded operators visible from this 4254 // point. We perform both an operator-name lookup from the local 4255 // scope and an argument-dependent lookup based on the types of 4256 // the arguments. 4257 FunctionSet Functions; 4258 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4259 if (OverOp != OO_None) { 4260 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4261 Functions); 4262 Expr *Args[2] = { lhs, rhs }; 4263 DeclarationName OpName 4264 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4265 ArgumentDependentLookup(OpName, Args, 2, Functions); 4266 } 4267 4268 // Build the (potentially-overloaded, potentially-dependent) 4269 // binary operation. 4270 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4271 } 4272 4273 // Build a built-in binary operation. 4274 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4275} 4276 4277Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4278 unsigned OpcIn, 4279 ExprArg InputArg) { 4280 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4281 4282 // FIXME: Input is modified below, but InputArg is not updated 4283 // appropriately. 4284 Expr *Input = (Expr *)InputArg.get(); 4285 QualType resultType; 4286 switch (Opc) { 4287 case UnaryOperator::PostInc: 4288 case UnaryOperator::PostDec: 4289 case UnaryOperator::OffsetOf: 4290 assert(false && "Invalid unary operator"); 4291 break; 4292 4293 case UnaryOperator::PreInc: 4294 case UnaryOperator::PreDec: 4295 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4296 Opc == UnaryOperator::PreInc); 4297 break; 4298 case UnaryOperator::AddrOf: 4299 resultType = CheckAddressOfOperand(Input, OpLoc); 4300 break; 4301 case UnaryOperator::Deref: 4302 DefaultFunctionArrayConversion(Input); 4303 resultType = CheckIndirectionOperand(Input, OpLoc); 4304 break; 4305 case UnaryOperator::Plus: 4306 case UnaryOperator::Minus: 4307 UsualUnaryConversions(Input); 4308 resultType = Input->getType(); 4309 if (resultType->isDependentType()) 4310 break; 4311 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4312 break; 4313 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4314 resultType->isEnumeralType()) 4315 break; 4316 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4317 Opc == UnaryOperator::Plus && 4318 resultType->isPointerType()) 4319 break; 4320 4321 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4322 << resultType << Input->getSourceRange()); 4323 case UnaryOperator::Not: // bitwise complement 4324 UsualUnaryConversions(Input); 4325 resultType = Input->getType(); 4326 if (resultType->isDependentType()) 4327 break; 4328 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4329 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4330 // C99 does not support '~' for complex conjugation. 4331 Diag(OpLoc, diag::ext_integer_complement_complex) 4332 << resultType << Input->getSourceRange(); 4333 else if (!resultType->isIntegerType()) 4334 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4335 << resultType << Input->getSourceRange()); 4336 break; 4337 case UnaryOperator::LNot: // logical negation 4338 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4339 DefaultFunctionArrayConversion(Input); 4340 resultType = Input->getType(); 4341 if (resultType->isDependentType()) 4342 break; 4343 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4344 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4345 << resultType << Input->getSourceRange()); 4346 // LNot always has type int. C99 6.5.3.3p5. 4347 // In C++, it's bool. C++ 5.3.1p8 4348 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4349 break; 4350 case UnaryOperator::Real: 4351 case UnaryOperator::Imag: 4352 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4353 break; 4354 case UnaryOperator::Extension: 4355 resultType = Input->getType(); 4356 break; 4357 } 4358 if (resultType.isNull()) 4359 return ExprError(); 4360 4361 InputArg.release(); 4362 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4363} 4364 4365// Unary Operators. 'Tok' is the token for the operator. 4366Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4367 tok::TokenKind Op, ExprArg input) { 4368 Expr *Input = (Expr*)input.get(); 4369 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4370 4371 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4372 // Find all of the overloaded operators visible from this 4373 // point. We perform both an operator-name lookup from the local 4374 // scope and an argument-dependent lookup based on the types of 4375 // the arguments. 4376 FunctionSet Functions; 4377 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4378 if (OverOp != OO_None) { 4379 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4380 Functions); 4381 DeclarationName OpName 4382 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4383 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4384 } 4385 4386 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4387 } 4388 4389 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4390} 4391 4392/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4393Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4394 SourceLocation LabLoc, 4395 IdentifierInfo *LabelII) { 4396 // Look up the record for this label identifier. 4397 LabelStmt *&LabelDecl = CurBlock ? CurBlock->LabelMap[LabelII] : 4398 LabelMap[LabelII]; 4399 4400 // If we haven't seen this label yet, create a forward reference. It 4401 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4402 if (LabelDecl == 0) 4403 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4404 4405 // Create the AST node. The address of a label always has type 'void*'. 4406 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4407 Context.getPointerType(Context.VoidTy))); 4408} 4409 4410Sema::OwningExprResult 4411Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4412 SourceLocation RPLoc) { // "({..})" 4413 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4414 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4415 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4416 4417 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4418 if (isFileScope) { 4419 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4420 } 4421 4422 // FIXME: there are a variety of strange constraints to enforce here, for 4423 // example, it is not possible to goto into a stmt expression apparently. 4424 // More semantic analysis is needed. 4425 4426 // FIXME: the last statement in the compount stmt has its value used. We 4427 // should not warn about it being unused. 4428 4429 // If there are sub stmts in the compound stmt, take the type of the last one 4430 // as the type of the stmtexpr. 4431 QualType Ty = Context.VoidTy; 4432 4433 if (!Compound->body_empty()) { 4434 Stmt *LastStmt = Compound->body_back(); 4435 // If LastStmt is a label, skip down through into the body. 4436 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4437 LastStmt = Label->getSubStmt(); 4438 4439 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4440 Ty = LastExpr->getType(); 4441 } 4442 4443 // FIXME: Check that expression type is complete/non-abstract; statement 4444 // expressions are not lvalues. 4445 4446 substmt.release(); 4447 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4448} 4449 4450Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4451 SourceLocation BuiltinLoc, 4452 SourceLocation TypeLoc, 4453 TypeTy *argty, 4454 OffsetOfComponent *CompPtr, 4455 unsigned NumComponents, 4456 SourceLocation RPLoc) { 4457 // FIXME: This function leaks all expressions in the offset components on 4458 // error. 4459 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4460 assert(!ArgTy.isNull() && "Missing type argument!"); 4461 4462 bool Dependent = ArgTy->isDependentType(); 4463 4464 // We must have at least one component that refers to the type, and the first 4465 // one is known to be a field designator. Verify that the ArgTy represents 4466 // a struct/union/class. 4467 if (!Dependent && !ArgTy->isRecordType()) 4468 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4469 4470 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 4471 // with an incomplete type would be illegal. 4472 4473 // Otherwise, create a null pointer as the base, and iteratively process 4474 // the offsetof designators. 4475 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4476 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4477 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4478 ArgTy, SourceLocation()); 4479 4480 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4481 // GCC extension, diagnose them. 4482 // FIXME: This diagnostic isn't actually visible because the location is in 4483 // a system header! 4484 if (NumComponents != 1) 4485 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4486 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4487 4488 if (!Dependent) { 4489 // FIXME: Dependent case loses a lot of information here. And probably 4490 // leaks like a sieve. 4491 for (unsigned i = 0; i != NumComponents; ++i) { 4492 const OffsetOfComponent &OC = CompPtr[i]; 4493 if (OC.isBrackets) { 4494 // Offset of an array sub-field. TODO: Should we allow vector elements? 4495 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4496 if (!AT) { 4497 Res->Destroy(Context); 4498 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 4499 << Res->getType()); 4500 } 4501 4502 // FIXME: C++: Verify that operator[] isn't overloaded. 4503 4504 // Promote the array so it looks more like a normal array subscript 4505 // expression. 4506 DefaultFunctionArrayConversion(Res); 4507 4508 // C99 6.5.2.1p1 4509 Expr *Idx = static_cast<Expr*>(OC.U.E); 4510 // FIXME: Leaks Res 4511 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4512 return ExprError(Diag(Idx->getLocStart(), 4513 diag::err_typecheck_subscript) 4514 << Idx->getSourceRange()); 4515 4516 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4517 OC.LocEnd); 4518 continue; 4519 } 4520 4521 const RecordType *RC = Res->getType()->getAsRecordType(); 4522 if (!RC) { 4523 Res->Destroy(Context); 4524 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 4525 << Res->getType()); 4526 } 4527 4528 // Get the decl corresponding to this. 4529 RecordDecl *RD = RC->getDecl(); 4530 FieldDecl *MemberDecl 4531 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4532 LookupMemberName) 4533 .getAsDecl()); 4534 // FIXME: Leaks Res 4535 if (!MemberDecl) 4536 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 4537 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 4538 4539 // FIXME: C++: Verify that MemberDecl isn't a static field. 4540 // FIXME: Verify that MemberDecl isn't a bitfield. 4541 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 4542 // matter here. 4543 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4544 MemberDecl->getType().getNonReferenceType()); 4545 } 4546 } 4547 4548 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4549 Context.getSizeType(), BuiltinLoc)); 4550} 4551 4552 4553Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4554 TypeTy *arg1,TypeTy *arg2, 4555 SourceLocation RPLoc) { 4556 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4557 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4558 4559 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4560 4561 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 4562 argT1, argT2, RPLoc)); 4563} 4564 4565Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 4566 ExprArg cond, 4567 ExprArg expr1, ExprArg expr2, 4568 SourceLocation RPLoc) { 4569 Expr *CondExpr = static_cast<Expr*>(cond.get()); 4570 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 4571 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 4572 4573 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4574 4575 QualType resType; 4576 if (CondExpr->isValueDependent()) { 4577 resType = Context.DependentTy; 4578 } else { 4579 // The conditional expression is required to be a constant expression. 4580 llvm::APSInt condEval(32); 4581 SourceLocation ExpLoc; 4582 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4583 return ExprError(Diag(ExpLoc, 4584 diag::err_typecheck_choose_expr_requires_constant) 4585 << CondExpr->getSourceRange()); 4586 4587 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4588 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 4589 } 4590 4591 cond.release(); expr1.release(); expr2.release(); 4592 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4593 resType, RPLoc)); 4594} 4595 4596//===----------------------------------------------------------------------===// 4597// Clang Extensions. 4598//===----------------------------------------------------------------------===// 4599 4600/// ActOnBlockStart - This callback is invoked when a block literal is started. 4601void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4602 // Analyze block parameters. 4603 BlockSemaInfo *BSI = new BlockSemaInfo(); 4604 4605 // Add BSI to CurBlock. 4606 BSI->PrevBlockInfo = CurBlock; 4607 CurBlock = BSI; 4608 4609 BSI->ReturnType = 0; 4610 BSI->TheScope = BlockScope; 4611 BSI->hasBlockDeclRefExprs = false; 4612 4613 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4614 PushDeclContext(BlockScope, BSI->TheDecl); 4615} 4616 4617void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4618 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4619 4620 if (ParamInfo.getNumTypeObjects() == 0 4621 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4622 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4623 4624 // The type is entirely optional as well, if none, use DependentTy. 4625 if (T.isNull()) 4626 T = Context.DependentTy; 4627 4628 // The parameter list is optional, if there was none, assume (). 4629 if (!T->isFunctionType()) 4630 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4631 4632 CurBlock->hasPrototype = true; 4633 CurBlock->isVariadic = false; 4634 Type *RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4635 .getTypePtr(); 4636 4637 if (!RetTy->isDependentType()) 4638 CurBlock->ReturnType = RetTy; 4639 return; 4640 } 4641 4642 // Analyze arguments to block. 4643 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4644 "Not a function declarator!"); 4645 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4646 4647 CurBlock->hasPrototype = FTI.hasPrototype; 4648 CurBlock->isVariadic = true; 4649 4650 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4651 // no arguments, not a function that takes a single void argument. 4652 if (FTI.hasPrototype && 4653 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4654 (!FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType().getCVRQualifiers()&& 4655 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType())) { 4656 // empty arg list, don't push any params. 4657 CurBlock->isVariadic = false; 4658 } else if (FTI.hasPrototype) { 4659 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4660 CurBlock->Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 4661 CurBlock->isVariadic = FTI.isVariadic; 4662 QualType T = GetTypeForDeclarator (ParamInfo, CurScope); 4663 4664 Type* RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4665 .getTypePtr(); 4666 4667 if (!RetTy->isDependentType()) 4668 CurBlock->ReturnType = RetTy; 4669 } 4670 CurBlock->TheDecl->setParams(Context, &CurBlock->Params[0], 4671 CurBlock->Params.size()); 4672 4673 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4674 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4675 // If this has an identifier, add it to the scope stack. 4676 if ((*AI)->getIdentifier()) 4677 PushOnScopeChains(*AI, CurBlock->TheScope); 4678} 4679 4680/// ActOnBlockError - If there is an error parsing a block, this callback 4681/// is invoked to pop the information about the block from the action impl. 4682void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4683 // Ensure that CurBlock is deleted. 4684 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4685 4686 // Pop off CurBlock, handle nested blocks. 4687 CurBlock = CurBlock->PrevBlockInfo; 4688 4689 // FIXME: Delete the ParmVarDecl objects as well??? 4690 4691} 4692 4693/// ActOnBlockStmtExpr - This is called when the body of a block statement 4694/// literal was successfully completed. ^(int x){...} 4695Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 4696 StmtArg body, Scope *CurScope) { 4697 // If blocks are disabled, emit an error. 4698 if (!LangOpts.Blocks) 4699 Diag(CaretLoc, diag::err_blocks_disable); 4700 4701 // Ensure that CurBlock is deleted. 4702 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4703 4704 PopDeclContext(); 4705 4706 // Pop off CurBlock, handle nested blocks. 4707 CurBlock = CurBlock->PrevBlockInfo; 4708 4709 QualType RetTy = Context.VoidTy; 4710 if (BSI->ReturnType) 4711 RetTy = QualType(BSI->ReturnType, 0); 4712 4713 llvm::SmallVector<QualType, 8> ArgTypes; 4714 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4715 ArgTypes.push_back(BSI->Params[i]->getType()); 4716 4717 QualType BlockTy; 4718 if (!BSI->hasPrototype) 4719 BlockTy = Context.getFunctionNoProtoType(RetTy); 4720 else 4721 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 4722 BSI->isVariadic, 0); 4723 4724 // FIXME: Check that return/parameter types are complete/non-abstract 4725 4726 BlockTy = Context.getBlockPointerType(BlockTy); 4727 4728 BSI->TheDecl->setBody(static_cast<CompoundStmt*>(body.release())); 4729 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 4730 BSI->hasBlockDeclRefExprs)); 4731} 4732 4733Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 4734 ExprArg expr, TypeTy *type, 4735 SourceLocation RPLoc) { 4736 QualType T = QualType::getFromOpaquePtr(type); 4737 Expr *E = static_cast<Expr*>(expr.get()); 4738 Expr *OrigExpr = E; 4739 4740 InitBuiltinVaListType(); 4741 4742 // Get the va_list type 4743 QualType VaListType = Context.getBuiltinVaListType(); 4744 // Deal with implicit array decay; for example, on x86-64, 4745 // va_list is an array, but it's supposed to decay to 4746 // a pointer for va_arg. 4747 if (VaListType->isArrayType()) 4748 VaListType = Context.getArrayDecayedType(VaListType); 4749 // Make sure the input expression also decays appropriately. 4750 UsualUnaryConversions(E); 4751 4752 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) { 4753 return ExprError(Diag(E->getLocStart(), 4754 diag::err_first_argument_to_va_arg_not_of_type_va_list) 4755 << OrigExpr->getType() << E->getSourceRange()); 4756 } 4757 4758 // FIXME: Check that type is complete/non-abstract 4759 // FIXME: Warn if a non-POD type is passed in. 4760 4761 expr.release(); 4762 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 4763 RPLoc)); 4764} 4765 4766Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 4767 // The type of __null will be int or long, depending on the size of 4768 // pointers on the target. 4769 QualType Ty; 4770 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 4771 Ty = Context.IntTy; 4772 else 4773 Ty = Context.LongTy; 4774 4775 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 4776} 4777 4778bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 4779 SourceLocation Loc, 4780 QualType DstType, QualType SrcType, 4781 Expr *SrcExpr, const char *Flavor) { 4782 // Decode the result (notice that AST's are still created for extensions). 4783 bool isInvalid = false; 4784 unsigned DiagKind; 4785 switch (ConvTy) { 4786 default: assert(0 && "Unknown conversion type"); 4787 case Compatible: return false; 4788 case PointerToInt: 4789 DiagKind = diag::ext_typecheck_convert_pointer_int; 4790 break; 4791 case IntToPointer: 4792 DiagKind = diag::ext_typecheck_convert_int_pointer; 4793 break; 4794 case IncompatiblePointer: 4795 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 4796 break; 4797 case IncompatiblePointerSign: 4798 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 4799 break; 4800 case FunctionVoidPointer: 4801 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 4802 break; 4803 case CompatiblePointerDiscardsQualifiers: 4804 // If the qualifiers lost were because we were applying the 4805 // (deprecated) C++ conversion from a string literal to a char* 4806 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 4807 // Ideally, this check would be performed in 4808 // CheckPointerTypesForAssignment. However, that would require a 4809 // bit of refactoring (so that the second argument is an 4810 // expression, rather than a type), which should be done as part 4811 // of a larger effort to fix CheckPointerTypesForAssignment for 4812 // C++ semantics. 4813 if (getLangOptions().CPlusPlus && 4814 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 4815 return false; 4816 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 4817 break; 4818 case IntToBlockPointer: 4819 DiagKind = diag::err_int_to_block_pointer; 4820 break; 4821 case IncompatibleBlockPointer: 4822 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 4823 break; 4824 case IncompatibleObjCQualifiedId: 4825 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 4826 // it can give a more specific diagnostic. 4827 DiagKind = diag::warn_incompatible_qualified_id; 4828 break; 4829 case IncompatibleVectors: 4830 DiagKind = diag::warn_incompatible_vectors; 4831 break; 4832 case Incompatible: 4833 DiagKind = diag::err_typecheck_convert_incompatible; 4834 isInvalid = true; 4835 break; 4836 } 4837 4838 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 4839 << SrcExpr->getSourceRange(); 4840 return isInvalid; 4841} 4842 4843bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 4844{ 4845 Expr::EvalResult EvalResult; 4846 4847 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 4848 EvalResult.HasSideEffects) { 4849 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 4850 4851 if (EvalResult.Diag) { 4852 // We only show the note if it's not the usual "invalid subexpression" 4853 // or if it's actually in a subexpression. 4854 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 4855 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 4856 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4857 } 4858 4859 return true; 4860 } 4861 4862 if (EvalResult.Diag) { 4863 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 4864 E->getSourceRange(); 4865 4866 // Print the reason it's not a constant. 4867 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4868 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4869 } 4870 4871 if (Result) 4872 *Result = EvalResult.Val.getInt(); 4873 return false; 4874} 4875