SemaExpr.cpp revision cde3a2d585f80c567c3367ffcbcde0b1b041368f
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/LiteralSupport.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29/// \brief Determine whether the use of this declaration is valid, and 30/// emit any corresponding diagnostics. 31/// 32/// This routine diagnoses various problems with referencing 33/// declarations that can occur when using a declaration. For example, 34/// it might warn if a deprecated or unavailable declaration is being 35/// used, or produce an error (and return true) if a C++0x deleted 36/// function is being used. 37/// 38/// \returns true if there was an error (this declaration cannot be 39/// referenced), false otherwise. 40bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 41 // See if the decl is deprecated. 42 if (D->getAttr<DeprecatedAttr>()) { 43 // Implementing deprecated stuff requires referencing deprecated 44 // stuff. Don't warn if we are implementing a deprecated 45 // construct. 46 bool isSilenced = false; 47 48 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 49 // If this reference happens *in* a deprecated function or method, don't 50 // warn. 51 isSilenced = ND->getAttr<DeprecatedAttr>(); 52 53 // If this is an Objective-C method implementation, check to see if the 54 // method was deprecated on the declaration, not the definition. 55 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 56 // The semantic decl context of a ObjCMethodDecl is the 57 // ObjCImplementationDecl. 58 if (ObjCImplementationDecl *Impl 59 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 60 61 MD = Impl->getClassInterface()->getMethod(MD->getSelector(), 62 MD->isInstanceMethod()); 63 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); 64 } 65 } 66 } 67 68 if (!isSilenced) 69 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 70 } 71 72 // See if this is a deleted function. 73 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 74 if (FD->isDeleted()) { 75 Diag(Loc, diag::err_deleted_function_use); 76 Diag(D->getLocation(), diag::note_unavailable_here) << true; 77 return true; 78 } 79 } 80 81 // See if the decl is unavailable 82 if (D->getAttr<UnavailableAttr>()) { 83 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 84 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 85 } 86 87 return false; 88} 89 90SourceRange Sema::getExprRange(ExprTy *E) const { 91 Expr *Ex = (Expr *)E; 92 return Ex? Ex->getSourceRange() : SourceRange(); 93} 94 95//===----------------------------------------------------------------------===// 96// Standard Promotions and Conversions 97//===----------------------------------------------------------------------===// 98 99/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 100void Sema::DefaultFunctionArrayConversion(Expr *&E) { 101 QualType Ty = E->getType(); 102 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 103 104 if (Ty->isFunctionType()) 105 ImpCastExprToType(E, Context.getPointerType(Ty)); 106 else if (Ty->isArrayType()) { 107 // In C90 mode, arrays only promote to pointers if the array expression is 108 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 109 // type 'array of type' is converted to an expression that has type 'pointer 110 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 111 // that has type 'array of type' ...". The relevant change is "an lvalue" 112 // (C90) to "an expression" (C99). 113 // 114 // C++ 4.2p1: 115 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 116 // T" can be converted to an rvalue of type "pointer to T". 117 // 118 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 119 E->isLvalue(Context) == Expr::LV_Valid) 120 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 121 } 122} 123 124/// UsualUnaryConversions - Performs various conversions that are common to most 125/// operators (C99 6.3). The conversions of array and function types are 126/// sometimes surpressed. For example, the array->pointer conversion doesn't 127/// apply if the array is an argument to the sizeof or address (&) operators. 128/// In these instances, this routine should *not* be called. 129Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 130 QualType Ty = Expr->getType(); 131 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 132 133 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 134 ImpCastExprToType(Expr, Context.IntTy); 135 else 136 DefaultFunctionArrayConversion(Expr); 137 138 return Expr; 139} 140 141/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 142/// do not have a prototype. Arguments that have type float are promoted to 143/// double. All other argument types are converted by UsualUnaryConversions(). 144void Sema::DefaultArgumentPromotion(Expr *&Expr) { 145 QualType Ty = Expr->getType(); 146 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 147 148 // If this is a 'float' (CVR qualified or typedef) promote to double. 149 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 150 if (BT->getKind() == BuiltinType::Float) 151 return ImpCastExprToType(Expr, Context.DoubleTy); 152 153 UsualUnaryConversions(Expr); 154} 155 156// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 157// will warn if the resulting type is not a POD type. 158void Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 159 DefaultArgumentPromotion(Expr); 160 161 if (!Expr->getType()->isPODType()) { 162 Diag(Expr->getLocStart(), 163 diag::warn_cannot_pass_non_pod_arg_to_vararg) << 164 Expr->getType() << CT; 165 } 166} 167 168 169/// UsualArithmeticConversions - Performs various conversions that are common to 170/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 171/// routine returns the first non-arithmetic type found. The client is 172/// responsible for emitting appropriate error diagnostics. 173/// FIXME: verify the conversion rules for "complex int" are consistent with 174/// GCC. 175QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 176 bool isCompAssign) { 177 if (!isCompAssign) { 178 UsualUnaryConversions(lhsExpr); 179 UsualUnaryConversions(rhsExpr); 180 } 181 182 // For conversion purposes, we ignore any qualifiers. 183 // For example, "const float" and "float" are equivalent. 184 QualType lhs = 185 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 186 QualType rhs = 187 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 188 189 // If both types are identical, no conversion is needed. 190 if (lhs == rhs) 191 return lhs; 192 193 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 194 // The caller can deal with this (e.g. pointer + int). 195 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 196 return lhs; 197 198 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 199 if (!isCompAssign) { 200 ImpCastExprToType(lhsExpr, destType); 201 ImpCastExprToType(rhsExpr, destType); 202 } 203 return destType; 204} 205 206QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 207 // Perform the usual unary conversions. We do this early so that 208 // integral promotions to "int" can allow us to exit early, in the 209 // lhs == rhs check. Also, for conversion purposes, we ignore any 210 // qualifiers. For example, "const float" and "float" are 211 // equivalent. 212 if (lhs->isPromotableIntegerType()) 213 lhs = Context.IntTy; 214 else 215 lhs = lhs.getUnqualifiedType(); 216 if (rhs->isPromotableIntegerType()) 217 rhs = Context.IntTy; 218 else 219 rhs = rhs.getUnqualifiedType(); 220 221 // If both types are identical, no conversion is needed. 222 if (lhs == rhs) 223 return lhs; 224 225 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 226 // The caller can deal with this (e.g. pointer + int). 227 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 228 return lhs; 229 230 // At this point, we have two different arithmetic types. 231 232 // Handle complex types first (C99 6.3.1.8p1). 233 if (lhs->isComplexType() || rhs->isComplexType()) { 234 // if we have an integer operand, the result is the complex type. 235 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 236 // convert the rhs to the lhs complex type. 237 return lhs; 238 } 239 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 240 // convert the lhs to the rhs complex type. 241 return rhs; 242 } 243 // This handles complex/complex, complex/float, or float/complex. 244 // When both operands are complex, the shorter operand is converted to the 245 // type of the longer, and that is the type of the result. This corresponds 246 // to what is done when combining two real floating-point operands. 247 // The fun begins when size promotion occur across type domains. 248 // From H&S 6.3.4: When one operand is complex and the other is a real 249 // floating-point type, the less precise type is converted, within it's 250 // real or complex domain, to the precision of the other type. For example, 251 // when combining a "long double" with a "double _Complex", the 252 // "double _Complex" is promoted to "long double _Complex". 253 int result = Context.getFloatingTypeOrder(lhs, rhs); 254 255 if (result > 0) { // The left side is bigger, convert rhs. 256 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 257 } else if (result < 0) { // The right side is bigger, convert lhs. 258 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 259 } 260 // At this point, lhs and rhs have the same rank/size. Now, make sure the 261 // domains match. This is a requirement for our implementation, C99 262 // does not require this promotion. 263 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 264 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 265 return rhs; 266 } else { // handle "_Complex double, double". 267 return lhs; 268 } 269 } 270 return lhs; // The domain/size match exactly. 271 } 272 // Now handle "real" floating types (i.e. float, double, long double). 273 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 274 // if we have an integer operand, the result is the real floating type. 275 if (rhs->isIntegerType()) { 276 // convert rhs to the lhs floating point type. 277 return lhs; 278 } 279 if (rhs->isComplexIntegerType()) { 280 // convert rhs to the complex floating point type. 281 return Context.getComplexType(lhs); 282 } 283 if (lhs->isIntegerType()) { 284 // convert lhs to the rhs floating point type. 285 return rhs; 286 } 287 if (lhs->isComplexIntegerType()) { 288 // convert lhs to the complex floating point type. 289 return Context.getComplexType(rhs); 290 } 291 // We have two real floating types, float/complex combos were handled above. 292 // Convert the smaller operand to the bigger result. 293 int result = Context.getFloatingTypeOrder(lhs, rhs); 294 if (result > 0) // convert the rhs 295 return lhs; 296 assert(result < 0 && "illegal float comparison"); 297 return rhs; // convert the lhs 298 } 299 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 300 // Handle GCC complex int extension. 301 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 302 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 303 304 if (lhsComplexInt && rhsComplexInt) { 305 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 306 rhsComplexInt->getElementType()) >= 0) 307 return lhs; // convert the rhs 308 return rhs; 309 } else if (lhsComplexInt && rhs->isIntegerType()) { 310 // convert the rhs to the lhs complex type. 311 return lhs; 312 } else if (rhsComplexInt && lhs->isIntegerType()) { 313 // convert the lhs to the rhs complex type. 314 return rhs; 315 } 316 } 317 // Finally, we have two differing integer types. 318 // The rules for this case are in C99 6.3.1.8 319 int compare = Context.getIntegerTypeOrder(lhs, rhs); 320 bool lhsSigned = lhs->isSignedIntegerType(), 321 rhsSigned = rhs->isSignedIntegerType(); 322 QualType destType; 323 if (lhsSigned == rhsSigned) { 324 // Same signedness; use the higher-ranked type 325 destType = compare >= 0 ? lhs : rhs; 326 } else if (compare != (lhsSigned ? 1 : -1)) { 327 // The unsigned type has greater than or equal rank to the 328 // signed type, so use the unsigned type 329 destType = lhsSigned ? rhs : lhs; 330 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 331 // The two types are different widths; if we are here, that 332 // means the signed type is larger than the unsigned type, so 333 // use the signed type. 334 destType = lhsSigned ? lhs : rhs; 335 } else { 336 // The signed type is higher-ranked than the unsigned type, 337 // but isn't actually any bigger (like unsigned int and long 338 // on most 32-bit systems). Use the unsigned type corresponding 339 // to the signed type. 340 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 341 } 342 return destType; 343} 344 345//===----------------------------------------------------------------------===// 346// Semantic Analysis for various Expression Types 347//===----------------------------------------------------------------------===// 348 349 350/// ActOnStringLiteral - The specified tokens were lexed as pasted string 351/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 352/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 353/// multiple tokens. However, the common case is that StringToks points to one 354/// string. 355/// 356Action::OwningExprResult 357Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 358 assert(NumStringToks && "Must have at least one string!"); 359 360 StringLiteralParser Literal(StringToks, NumStringToks, PP); 361 if (Literal.hadError) 362 return ExprError(); 363 364 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 365 for (unsigned i = 0; i != NumStringToks; ++i) 366 StringTokLocs.push_back(StringToks[i].getLocation()); 367 368 QualType StrTy = Context.CharTy; 369 if (Literal.AnyWide) StrTy = Context.getWCharType(); 370 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 371 372 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 373 if (getLangOptions().CPlusPlus) 374 StrTy.addConst(); 375 376 // Get an array type for the string, according to C99 6.4.5. This includes 377 // the nul terminator character as well as the string length for pascal 378 // strings. 379 StrTy = Context.getConstantArrayType(StrTy, 380 llvm::APInt(32, Literal.GetNumStringChars()+1), 381 ArrayType::Normal, 0); 382 383 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 384 return Owned(StringLiteral::Create(Context, Literal.GetString(), 385 Literal.GetStringLength(), 386 Literal.AnyWide, StrTy, 387 &StringTokLocs[0], 388 StringTokLocs.size())); 389} 390 391/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 392/// CurBlock to VD should cause it to be snapshotted (as we do for auto 393/// variables defined outside the block) or false if this is not needed (e.g. 394/// for values inside the block or for globals). 395/// 396/// FIXME: This will create BlockDeclRefExprs for global variables, 397/// function references, etc which is suboptimal :) and breaks 398/// things like "integer constant expression" tests. 399static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 400 ValueDecl *VD) { 401 // If the value is defined inside the block, we couldn't snapshot it even if 402 // we wanted to. 403 if (CurBlock->TheDecl == VD->getDeclContext()) 404 return false; 405 406 // If this is an enum constant or function, it is constant, don't snapshot. 407 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 408 return false; 409 410 // If this is a reference to an extern, static, or global variable, no need to 411 // snapshot it. 412 // FIXME: What about 'const' variables in C++? 413 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 414 return Var->hasLocalStorage(); 415 416 return true; 417} 418 419 420 421/// ActOnIdentifierExpr - The parser read an identifier in expression context, 422/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 423/// identifier is used in a function call context. 424/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 425/// class or namespace that the identifier must be a member of. 426Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 427 IdentifierInfo &II, 428 bool HasTrailingLParen, 429 const CXXScopeSpec *SS, 430 bool isAddressOfOperand) { 431 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 432 isAddressOfOperand); 433} 434 435/// BuildDeclRefExpr - Build either a DeclRefExpr or a 436/// QualifiedDeclRefExpr based on whether or not SS is a 437/// nested-name-specifier. 438DeclRefExpr * 439Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 440 bool TypeDependent, bool ValueDependent, 441 const CXXScopeSpec *SS) { 442 if (SS && !SS->isEmpty()) { 443 llvm::SmallVector<NestedNameSpecifier, 16> Specs; 444 for (CXXScopeSpec::iterator Spec = SS->begin(), SpecEnd = SS->end(); 445 Spec != SpecEnd; ++Spec) 446 Specs.push_back(NestedNameSpecifier::getFromOpaquePtr(*Spec)); 447 return QualifiedDeclRefExpr::Create(Context, D, Ty, Loc, TypeDependent, 448 ValueDependent, SS->getRange(), 449 &Specs[0], Specs.size()); 450 } else 451 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 452} 453 454/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 455/// variable corresponding to the anonymous union or struct whose type 456/// is Record. 457static Decl *getObjectForAnonymousRecordDecl(RecordDecl *Record) { 458 assert(Record->isAnonymousStructOrUnion() && 459 "Record must be an anonymous struct or union!"); 460 461 // FIXME: Once Decls are directly linked together, this will 462 // be an O(1) operation rather than a slow walk through DeclContext's 463 // vector (which itself will be eliminated). DeclGroups might make 464 // this even better. 465 DeclContext *Ctx = Record->getDeclContext(); 466 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 467 DEnd = Ctx->decls_end(); 468 D != DEnd; ++D) { 469 if (*D == Record) { 470 // The object for the anonymous struct/union directly 471 // follows its type in the list of declarations. 472 ++D; 473 assert(D != DEnd && "Missing object for anonymous record"); 474 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 475 return *D; 476 } 477 } 478 479 assert(false && "Missing object for anonymous record"); 480 return 0; 481} 482 483Sema::OwningExprResult 484Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 485 FieldDecl *Field, 486 Expr *BaseObjectExpr, 487 SourceLocation OpLoc) { 488 assert(Field->getDeclContext()->isRecord() && 489 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 490 && "Field must be stored inside an anonymous struct or union"); 491 492 // Construct the sequence of field member references 493 // we'll have to perform to get to the field in the anonymous 494 // union/struct. The list of members is built from the field 495 // outward, so traverse it backwards to go from an object in 496 // the current context to the field we found. 497 llvm::SmallVector<FieldDecl *, 4> AnonFields; 498 AnonFields.push_back(Field); 499 VarDecl *BaseObject = 0; 500 DeclContext *Ctx = Field->getDeclContext(); 501 do { 502 RecordDecl *Record = cast<RecordDecl>(Ctx); 503 Decl *AnonObject = getObjectForAnonymousRecordDecl(Record); 504 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 505 AnonFields.push_back(AnonField); 506 else { 507 BaseObject = cast<VarDecl>(AnonObject); 508 break; 509 } 510 Ctx = Ctx->getParent(); 511 } while (Ctx->isRecord() && 512 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 513 514 // Build the expression that refers to the base object, from 515 // which we will build a sequence of member references to each 516 // of the anonymous union objects and, eventually, the field we 517 // found via name lookup. 518 bool BaseObjectIsPointer = false; 519 unsigned ExtraQuals = 0; 520 if (BaseObject) { 521 // BaseObject is an anonymous struct/union variable (and is, 522 // therefore, not part of another non-anonymous record). 523 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 524 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 525 SourceLocation()); 526 ExtraQuals 527 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 528 } else if (BaseObjectExpr) { 529 // The caller provided the base object expression. Determine 530 // whether its a pointer and whether it adds any qualifiers to the 531 // anonymous struct/union fields we're looking into. 532 QualType ObjectType = BaseObjectExpr->getType(); 533 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 534 BaseObjectIsPointer = true; 535 ObjectType = ObjectPtr->getPointeeType(); 536 } 537 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 538 } else { 539 // We've found a member of an anonymous struct/union that is 540 // inside a non-anonymous struct/union, so in a well-formed 541 // program our base object expression is "this". 542 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 543 if (!MD->isStatic()) { 544 QualType AnonFieldType 545 = Context.getTagDeclType( 546 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 547 QualType ThisType = Context.getTagDeclType(MD->getParent()); 548 if ((Context.getCanonicalType(AnonFieldType) 549 == Context.getCanonicalType(ThisType)) || 550 IsDerivedFrom(ThisType, AnonFieldType)) { 551 // Our base object expression is "this". 552 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 553 MD->getThisType(Context)); 554 BaseObjectIsPointer = true; 555 } 556 } else { 557 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 558 << Field->getDeclName()); 559 } 560 ExtraQuals = MD->getTypeQualifiers(); 561 } 562 563 if (!BaseObjectExpr) 564 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 565 << Field->getDeclName()); 566 } 567 568 // Build the implicit member references to the field of the 569 // anonymous struct/union. 570 Expr *Result = BaseObjectExpr; 571 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 572 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 573 FI != FIEnd; ++FI) { 574 QualType MemberType = (*FI)->getType(); 575 if (!(*FI)->isMutable()) { 576 unsigned combinedQualifiers 577 = MemberType.getCVRQualifiers() | ExtraQuals; 578 MemberType = MemberType.getQualifiedType(combinedQualifiers); 579 } 580 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 581 OpLoc, MemberType); 582 BaseObjectIsPointer = false; 583 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 584 } 585 586 return Owned(Result); 587} 588 589/// ActOnDeclarationNameExpr - The parser has read some kind of name 590/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 591/// performs lookup on that name and returns an expression that refers 592/// to that name. This routine isn't directly called from the parser, 593/// because the parser doesn't know about DeclarationName. Rather, 594/// this routine is called by ActOnIdentifierExpr, 595/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 596/// which form the DeclarationName from the corresponding syntactic 597/// forms. 598/// 599/// HasTrailingLParen indicates whether this identifier is used in a 600/// function call context. LookupCtx is only used for a C++ 601/// qualified-id (foo::bar) to indicate the class or namespace that 602/// the identifier must be a member of. 603/// 604/// isAddressOfOperand means that this expression is the direct operand 605/// of an address-of operator. This matters because this is the only 606/// situation where a qualified name referencing a non-static member may 607/// appear outside a member function of this class. 608Sema::OwningExprResult 609Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 610 DeclarationName Name, bool HasTrailingLParen, 611 const CXXScopeSpec *SS, 612 bool isAddressOfOperand) { 613 // Could be enum-constant, value decl, instance variable, etc. 614 if (SS && SS->isInvalid()) 615 return ExprError(); 616 617 // C++ [temp.dep.expr]p3: 618 // An id-expression is type-dependent if it contains: 619 // -- a nested-name-specifier that contains a class-name that 620 // names a dependent type. 621 if (SS && isDependentScopeSpecifier(*SS)) { 622 llvm::SmallVector<NestedNameSpecifier, 16> Specs; 623 for (CXXScopeSpec::iterator Spec = SS->begin(), SpecEnd = SS->end(); 624 Spec != SpecEnd; ++Spec) 625 Specs.push_back(NestedNameSpecifier::getFromOpaquePtr(*Spec)); 626 return Owned(UnresolvedDeclRefExpr::Create(Context, Name, Loc, 627 SS->getRange(), &Specs[0], 628 Specs.size())); 629 } 630 631 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 632 false, true, Loc); 633 634 NamedDecl *D = 0; 635 if (Lookup.isAmbiguous()) { 636 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 637 SS && SS->isSet() ? SS->getRange() 638 : SourceRange()); 639 return ExprError(); 640 } else 641 D = Lookup.getAsDecl(); 642 643 // If this reference is in an Objective-C method, then ivar lookup happens as 644 // well. 645 IdentifierInfo *II = Name.getAsIdentifierInfo(); 646 if (II && getCurMethodDecl()) { 647 // There are two cases to handle here. 1) scoped lookup could have failed, 648 // in which case we should look for an ivar. 2) scoped lookup could have 649 // found a decl, but that decl is outside the current instance method (i.e. 650 // a global variable). In these two cases, we do a lookup for an ivar with 651 // this name, if the lookup sucedes, we replace it our current decl. 652 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 653 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 654 ObjCInterfaceDecl *ClassDeclared; 655 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 656 // Check if referencing a field with __attribute__((deprecated)). 657 if (DiagnoseUseOfDecl(IV, Loc)) 658 return ExprError(); 659 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 660 // If a class method attemps to use a free standing ivar, this is 661 // an error. 662 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 663 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 664 << IV->getDeclName()); 665 // If a class method uses a global variable, even if an ivar with 666 // same name exists, use the global. 667 if (!IsClsMethod) { 668 if (IV->getAccessControl() == ObjCIvarDecl::Private && 669 ClassDeclared != IFace) 670 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 671 // FIXME: This should use a new expr for a direct reference, don't turn 672 // this into Self->ivar, just return a BareIVarExpr or something. 673 IdentifierInfo &II = Context.Idents.get("self"); 674 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 675 ObjCIvarRefExpr *MRef = new (Context) ObjCIvarRefExpr(IV, IV->getType(), 676 Loc, static_cast<Expr*>(SelfExpr.release()), 677 true, true); 678 Context.setFieldDecl(IFace, IV, MRef); 679 return Owned(MRef); 680 } 681 } 682 } 683 else if (getCurMethodDecl()->isInstanceMethod()) { 684 // We should warn if a local variable hides an ivar. 685 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 686 ObjCInterfaceDecl *ClassDeclared; 687 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 688 if (IV->getAccessControl() != ObjCIvarDecl::Private || 689 IFace == ClassDeclared) 690 Diag(Loc, diag::warn_ivar_use_hidden)<<IV->getDeclName(); 691 } 692 } 693 // Needed to implement property "super.method" notation. 694 if (D == 0 && II->isStr("super")) { 695 QualType T; 696 697 if (getCurMethodDecl()->isInstanceMethod()) 698 T = Context.getPointerType(Context.getObjCInterfaceType( 699 getCurMethodDecl()->getClassInterface())); 700 else 701 T = Context.getObjCClassType(); 702 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 703 } 704 } 705 706 // Determine whether this name might be a candidate for 707 // argument-dependent lookup. 708 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 709 HasTrailingLParen; 710 711 if (ADL && D == 0) { 712 // We've seen something of the form 713 // 714 // identifier( 715 // 716 // and we did not find any entity by the name 717 // "identifier". However, this identifier is still subject to 718 // argument-dependent lookup, so keep track of the name. 719 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 720 Context.OverloadTy, 721 Loc)); 722 } 723 724 if (D == 0) { 725 // Otherwise, this could be an implicitly declared function reference (legal 726 // in C90, extension in C99). 727 if (HasTrailingLParen && II && 728 !getLangOptions().CPlusPlus) // Not in C++. 729 D = ImplicitlyDefineFunction(Loc, *II, S); 730 else { 731 // If this name wasn't predeclared and if this is not a function call, 732 // diagnose the problem. 733 if (SS && !SS->isEmpty()) 734 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 735 << Name << SS->getRange()); 736 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 737 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 738 return ExprError(Diag(Loc, diag::err_undeclared_use) 739 << Name.getAsString()); 740 else 741 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 742 } 743 } 744 745 // If this is an expression of the form &Class::member, don't build an 746 // implicit member ref, because we want a pointer to the member in general, 747 // not any specific instance's member. 748 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 749 DeclContext *DC = computeDeclContext(*SS); 750 if (D && isa<CXXRecordDecl>(DC)) { 751 QualType DType; 752 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 753 DType = FD->getType().getNonReferenceType(); 754 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 755 DType = Method->getType(); 756 } else if (isa<OverloadedFunctionDecl>(D)) { 757 DType = Context.OverloadTy; 758 } 759 // Could be an inner type. That's diagnosed below, so ignore it here. 760 if (!DType.isNull()) { 761 // The pointer is type- and value-dependent if it points into something 762 // dependent. 763 bool Dependent = false; 764 for (; DC; DC = DC->getParent()) { 765 // FIXME: could stop early at namespace scope. 766 if (DC->isRecord()) { 767 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 768 if (Context.getTypeDeclType(Record)->isDependentType()) { 769 Dependent = true; 770 break; 771 } 772 } 773 } 774 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 775 } 776 } 777 } 778 779 // We may have found a field within an anonymous union or struct 780 // (C++ [class.union]). 781 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 782 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 783 return BuildAnonymousStructUnionMemberReference(Loc, FD); 784 785 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 786 if (!MD->isStatic()) { 787 // C++ [class.mfct.nonstatic]p2: 788 // [...] if name lookup (3.4.1) resolves the name in the 789 // id-expression to a nonstatic nontype member of class X or of 790 // a base class of X, the id-expression is transformed into a 791 // class member access expression (5.2.5) using (*this) (9.3.2) 792 // as the postfix-expression to the left of the '.' operator. 793 DeclContext *Ctx = 0; 794 QualType MemberType; 795 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 796 Ctx = FD->getDeclContext(); 797 MemberType = FD->getType(); 798 799 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 800 MemberType = RefType->getPointeeType(); 801 else if (!FD->isMutable()) { 802 unsigned combinedQualifiers 803 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 804 MemberType = MemberType.getQualifiedType(combinedQualifiers); 805 } 806 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 807 if (!Method->isStatic()) { 808 Ctx = Method->getParent(); 809 MemberType = Method->getType(); 810 } 811 } else if (OverloadedFunctionDecl *Ovl 812 = dyn_cast<OverloadedFunctionDecl>(D)) { 813 for (OverloadedFunctionDecl::function_iterator 814 Func = Ovl->function_begin(), 815 FuncEnd = Ovl->function_end(); 816 Func != FuncEnd; ++Func) { 817 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 818 if (!DMethod->isStatic()) { 819 Ctx = Ovl->getDeclContext(); 820 MemberType = Context.OverloadTy; 821 break; 822 } 823 } 824 } 825 826 if (Ctx && Ctx->isRecord()) { 827 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 828 QualType ThisType = Context.getTagDeclType(MD->getParent()); 829 if ((Context.getCanonicalType(CtxType) 830 == Context.getCanonicalType(ThisType)) || 831 IsDerivedFrom(ThisType, CtxType)) { 832 // Build the implicit member access expression. 833 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 834 MD->getThisType(Context)); 835 return Owned(new (Context) MemberExpr(This, true, D, 836 SourceLocation(), MemberType)); 837 } 838 } 839 } 840 } 841 842 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 843 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 844 if (MD->isStatic()) 845 // "invalid use of member 'x' in static member function" 846 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 847 << FD->getDeclName()); 848 } 849 850 // Any other ways we could have found the field in a well-formed 851 // program would have been turned into implicit member expressions 852 // above. 853 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 854 << FD->getDeclName()); 855 } 856 857 if (isa<TypedefDecl>(D)) 858 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 859 if (isa<ObjCInterfaceDecl>(D)) 860 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 861 if (isa<NamespaceDecl>(D)) 862 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 863 864 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 865 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 866 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 867 false, false, SS)); 868 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 869 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 870 false, false, SS)); 871 ValueDecl *VD = cast<ValueDecl>(D); 872 873 // Check whether this declaration can be used. Note that we suppress 874 // this check when we're going to perform argument-dependent lookup 875 // on this function name, because this might not be the function 876 // that overload resolution actually selects. 877 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 878 return ExprError(); 879 880 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 881 // Warn about constructs like: 882 // if (void *X = foo()) { ... } else { X }. 883 // In the else block, the pointer is always false. 884 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 885 Scope *CheckS = S; 886 while (CheckS) { 887 if (CheckS->isWithinElse() && 888 CheckS->getControlParent()->isDeclScope(Var)) { 889 if (Var->getType()->isBooleanType()) 890 ExprError(Diag(Loc, diag::warn_value_always_false) 891 << Var->getDeclName()); 892 else 893 ExprError(Diag(Loc, diag::warn_value_always_zero) 894 << Var->getDeclName()); 895 break; 896 } 897 898 // Move up one more control parent to check again. 899 CheckS = CheckS->getControlParent(); 900 if (CheckS) 901 CheckS = CheckS->getParent(); 902 } 903 } 904 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 905 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 906 // C99 DR 316 says that, if a function type comes from a 907 // function definition (without a prototype), that type is only 908 // used for checking compatibility. Therefore, when referencing 909 // the function, we pretend that we don't have the full function 910 // type. 911 QualType T = Func->getType(); 912 QualType NoProtoType = T; 913 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 914 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 915 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 916 } 917 } 918 919 // Only create DeclRefExpr's for valid Decl's. 920 if (VD->isInvalidDecl()) 921 return ExprError(); 922 923 // If the identifier reference is inside a block, and it refers to a value 924 // that is outside the block, create a BlockDeclRefExpr instead of a 925 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 926 // the block is formed. 927 // 928 // We do not do this for things like enum constants, global variables, etc, 929 // as they do not get snapshotted. 930 // 931 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 932 // Blocks that have these can't be constant. 933 CurBlock->hasBlockDeclRefExprs = true; 934 935 QualType ExprTy = VD->getType().getNonReferenceType(); 936 // The BlocksAttr indicates the variable is bound by-reference. 937 if (VD->getAttr<BlocksAttr>()) 938 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, true)); 939 940 // Variable will be bound by-copy, make it const within the closure. 941 ExprTy.addConst(); 942 return Owned(new (Context) BlockDeclRefExpr(VD, ExprTy, Loc, false)); 943 } 944 // If this reference is not in a block or if the referenced variable is 945 // within the block, create a normal DeclRefExpr. 946 947 bool TypeDependent = false; 948 bool ValueDependent = false; 949 if (getLangOptions().CPlusPlus) { 950 // C++ [temp.dep.expr]p3: 951 // An id-expression is type-dependent if it contains: 952 // - an identifier that was declared with a dependent type, 953 if (VD->getType()->isDependentType()) 954 TypeDependent = true; 955 // - FIXME: a template-id that is dependent, 956 // - a conversion-function-id that specifies a dependent type, 957 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 958 Name.getCXXNameType()->isDependentType()) 959 TypeDependent = true; 960 // - a nested-name-specifier that contains a class-name that 961 // names a dependent type. 962 else if (SS && !SS->isEmpty()) { 963 for (DeclContext *DC = computeDeclContext(*SS); 964 DC; DC = DC->getParent()) { 965 // FIXME: could stop early at namespace scope. 966 if (DC->isRecord()) { 967 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 968 if (Context.getTypeDeclType(Record)->isDependentType()) { 969 TypeDependent = true; 970 break; 971 } 972 } 973 } 974 } 975 976 // C++ [temp.dep.constexpr]p2: 977 // 978 // An identifier is value-dependent if it is: 979 // - a name declared with a dependent type, 980 if (TypeDependent) 981 ValueDependent = true; 982 // - the name of a non-type template parameter, 983 else if (isa<NonTypeTemplateParmDecl>(VD)) 984 ValueDependent = true; 985 // - a constant with integral or enumeration type and is 986 // initialized with an expression that is value-dependent 987 // (FIXME!). 988 } 989 990 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 991 TypeDependent, ValueDependent, SS)); 992} 993 994Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 995 tok::TokenKind Kind) { 996 PredefinedExpr::IdentType IT; 997 998 switch (Kind) { 999 default: assert(0 && "Unknown simple primary expr!"); 1000 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 1001 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 1002 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 1003 } 1004 1005 // Pre-defined identifiers are of type char[x], where x is the length of the 1006 // string. 1007 unsigned Length; 1008 if (FunctionDecl *FD = getCurFunctionDecl()) 1009 Length = FD->getIdentifier()->getLength(); 1010 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 1011 Length = MD->getSynthesizedMethodSize(); 1012 else { 1013 Diag(Loc, diag::ext_predef_outside_function); 1014 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 1015 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 1016 } 1017 1018 1019 llvm::APInt LengthI(32, Length + 1); 1020 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 1021 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 1022 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1023} 1024 1025Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1026 llvm::SmallString<16> CharBuffer; 1027 CharBuffer.resize(Tok.getLength()); 1028 const char *ThisTokBegin = &CharBuffer[0]; 1029 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1030 1031 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1032 Tok.getLocation(), PP); 1033 if (Literal.hadError()) 1034 return ExprError(); 1035 1036 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1037 1038 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1039 Literal.isWide(), 1040 type, Tok.getLocation())); 1041} 1042 1043Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1044 // Fast path for a single digit (which is quite common). A single digit 1045 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1046 if (Tok.getLength() == 1) { 1047 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1048 unsigned IntSize = Context.Target.getIntWidth(); 1049 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1050 Context.IntTy, Tok.getLocation())); 1051 } 1052 1053 llvm::SmallString<512> IntegerBuffer; 1054 // Add padding so that NumericLiteralParser can overread by one character. 1055 IntegerBuffer.resize(Tok.getLength()+1); 1056 const char *ThisTokBegin = &IntegerBuffer[0]; 1057 1058 // Get the spelling of the token, which eliminates trigraphs, etc. 1059 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1060 1061 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1062 Tok.getLocation(), PP); 1063 if (Literal.hadError) 1064 return ExprError(); 1065 1066 Expr *Res; 1067 1068 if (Literal.isFloatingLiteral()) { 1069 QualType Ty; 1070 if (Literal.isFloat) 1071 Ty = Context.FloatTy; 1072 else if (!Literal.isLong) 1073 Ty = Context.DoubleTy; 1074 else 1075 Ty = Context.LongDoubleTy; 1076 1077 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1078 1079 // isExact will be set by GetFloatValue(). 1080 bool isExact = false; 1081 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1082 &isExact, Ty, Tok.getLocation()); 1083 1084 } else if (!Literal.isIntegerLiteral()) { 1085 return ExprError(); 1086 } else { 1087 QualType Ty; 1088 1089 // long long is a C99 feature. 1090 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1091 Literal.isLongLong) 1092 Diag(Tok.getLocation(), diag::ext_longlong); 1093 1094 // Get the value in the widest-possible width. 1095 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1096 1097 if (Literal.GetIntegerValue(ResultVal)) { 1098 // If this value didn't fit into uintmax_t, warn and force to ull. 1099 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1100 Ty = Context.UnsignedLongLongTy; 1101 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1102 "long long is not intmax_t?"); 1103 } else { 1104 // If this value fits into a ULL, try to figure out what else it fits into 1105 // according to the rules of C99 6.4.4.1p5. 1106 1107 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1108 // be an unsigned int. 1109 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1110 1111 // Check from smallest to largest, picking the smallest type we can. 1112 unsigned Width = 0; 1113 if (!Literal.isLong && !Literal.isLongLong) { 1114 // Are int/unsigned possibilities? 1115 unsigned IntSize = Context.Target.getIntWidth(); 1116 1117 // Does it fit in a unsigned int? 1118 if (ResultVal.isIntN(IntSize)) { 1119 // Does it fit in a signed int? 1120 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1121 Ty = Context.IntTy; 1122 else if (AllowUnsigned) 1123 Ty = Context.UnsignedIntTy; 1124 Width = IntSize; 1125 } 1126 } 1127 1128 // Are long/unsigned long possibilities? 1129 if (Ty.isNull() && !Literal.isLongLong) { 1130 unsigned LongSize = Context.Target.getLongWidth(); 1131 1132 // Does it fit in a unsigned long? 1133 if (ResultVal.isIntN(LongSize)) { 1134 // Does it fit in a signed long? 1135 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1136 Ty = Context.LongTy; 1137 else if (AllowUnsigned) 1138 Ty = Context.UnsignedLongTy; 1139 Width = LongSize; 1140 } 1141 } 1142 1143 // Finally, check long long if needed. 1144 if (Ty.isNull()) { 1145 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1146 1147 // Does it fit in a unsigned long long? 1148 if (ResultVal.isIntN(LongLongSize)) { 1149 // Does it fit in a signed long long? 1150 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1151 Ty = Context.LongLongTy; 1152 else if (AllowUnsigned) 1153 Ty = Context.UnsignedLongLongTy; 1154 Width = LongLongSize; 1155 } 1156 } 1157 1158 // If we still couldn't decide a type, we probably have something that 1159 // does not fit in a signed long long, but has no U suffix. 1160 if (Ty.isNull()) { 1161 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1162 Ty = Context.UnsignedLongLongTy; 1163 Width = Context.Target.getLongLongWidth(); 1164 } 1165 1166 if (ResultVal.getBitWidth() != Width) 1167 ResultVal.trunc(Width); 1168 } 1169 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1170 } 1171 1172 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1173 if (Literal.isImaginary) 1174 Res = new (Context) ImaginaryLiteral(Res, 1175 Context.getComplexType(Res->getType())); 1176 1177 return Owned(Res); 1178} 1179 1180Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1181 SourceLocation R, ExprArg Val) { 1182 Expr *E = (Expr *)Val.release(); 1183 assert((E != 0) && "ActOnParenExpr() missing expr"); 1184 return Owned(new (Context) ParenExpr(L, R, E)); 1185} 1186 1187/// The UsualUnaryConversions() function is *not* called by this routine. 1188/// See C99 6.3.2.1p[2-4] for more details. 1189bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1190 SourceLocation OpLoc, 1191 const SourceRange &ExprRange, 1192 bool isSizeof) { 1193 if (exprType->isDependentType()) 1194 return false; 1195 1196 // C99 6.5.3.4p1: 1197 if (isa<FunctionType>(exprType)) { 1198 // alignof(function) is allowed. 1199 if (isSizeof) 1200 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1201 return false; 1202 } 1203 1204 if (exprType->isVoidType()) { 1205 Diag(OpLoc, diag::ext_sizeof_void_type) 1206 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1207 return false; 1208 } 1209 1210 return RequireCompleteType(OpLoc, exprType, 1211 isSizeof ? diag::err_sizeof_incomplete_type : 1212 diag::err_alignof_incomplete_type, 1213 ExprRange); 1214} 1215 1216bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1217 const SourceRange &ExprRange) { 1218 E = E->IgnoreParens(); 1219 1220 // alignof decl is always ok. 1221 if (isa<DeclRefExpr>(E)) 1222 return false; 1223 1224 // Cannot know anything else if the expression is dependent. 1225 if (E->isTypeDependent()) 1226 return false; 1227 1228 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1229 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { 1230 if (FD->isBitField()) { 1231 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1232 return true; 1233 } 1234 // Other fields are ok. 1235 return false; 1236 } 1237 } 1238 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1239} 1240 1241/// \brief Build a sizeof or alignof expression given a type operand. 1242Action::OwningExprResult 1243Sema::CreateSizeOfAlignOfExpr(QualType T, SourceLocation OpLoc, 1244 bool isSizeOf, SourceRange R) { 1245 if (T.isNull()) 1246 return ExprError(); 1247 1248 if (!T->isDependentType() && 1249 CheckSizeOfAlignOfOperand(T, OpLoc, R, isSizeOf)) 1250 return ExprError(); 1251 1252 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1253 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, T, 1254 Context.getSizeType(), OpLoc, 1255 R.getEnd())); 1256} 1257 1258/// \brief Build a sizeof or alignof expression given an expression 1259/// operand. 1260Action::OwningExprResult 1261Sema::CreateSizeOfAlignOfExpr(Expr *E, SourceLocation OpLoc, 1262 bool isSizeOf, SourceRange R) { 1263 // Verify that the operand is valid. 1264 bool isInvalid = false; 1265 if (E->isTypeDependent()) { 1266 // Delay type-checking for type-dependent expressions. 1267 } else if (!isSizeOf) { 1268 isInvalid = CheckAlignOfExpr(E, OpLoc, R); 1269 } else if (E->isBitField()) { // C99 6.5.3.4p1. 1270 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1271 isInvalid = true; 1272 } else { 1273 isInvalid = CheckSizeOfAlignOfOperand(E->getType(), OpLoc, R, true); 1274 } 1275 1276 if (isInvalid) 1277 return ExprError(); 1278 1279 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1280 return Owned(new (Context) SizeOfAlignOfExpr(isSizeOf, E, 1281 Context.getSizeType(), OpLoc, 1282 R.getEnd())); 1283} 1284 1285/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1286/// the same for @c alignof and @c __alignof 1287/// Note that the ArgRange is invalid if isType is false. 1288Action::OwningExprResult 1289Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1290 void *TyOrEx, const SourceRange &ArgRange) { 1291 // If error parsing type, ignore. 1292 if (TyOrEx == 0) return ExprError(); 1293 1294 if (isType) { 1295 QualType ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1296 return CreateSizeOfAlignOfExpr(ArgTy, OpLoc, isSizeof, ArgRange); 1297 } 1298 1299 // Get the end location. 1300 Expr *ArgEx = (Expr *)TyOrEx; 1301 Action::OwningExprResult Result 1302 = CreateSizeOfAlignOfExpr(ArgEx, OpLoc, isSizeof, ArgEx->getSourceRange()); 1303 1304 if (Result.isInvalid()) 1305 DeleteExpr(ArgEx); 1306 1307 return move(Result); 1308} 1309 1310QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1311 if (V->isTypeDependent()) 1312 return Context.DependentTy; 1313 1314 DefaultFunctionArrayConversion(V); 1315 1316 // These operators return the element type of a complex type. 1317 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1318 return CT->getElementType(); 1319 1320 // Otherwise they pass through real integer and floating point types here. 1321 if (V->getType()->isArithmeticType()) 1322 return V->getType(); 1323 1324 // Reject anything else. 1325 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1326 << (isReal ? "__real" : "__imag"); 1327 return QualType(); 1328} 1329 1330 1331 1332Action::OwningExprResult 1333Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1334 tok::TokenKind Kind, ExprArg Input) { 1335 Expr *Arg = (Expr *)Input.get(); 1336 1337 UnaryOperator::Opcode Opc; 1338 switch (Kind) { 1339 default: assert(0 && "Unknown unary op!"); 1340 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1341 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1342 } 1343 1344 if (getLangOptions().CPlusPlus && 1345 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1346 // Which overloaded operator? 1347 OverloadedOperatorKind OverOp = 1348 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1349 1350 // C++ [over.inc]p1: 1351 // 1352 // [...] If the function is a member function with one 1353 // parameter (which shall be of type int) or a non-member 1354 // function with two parameters (the second of which shall be 1355 // of type int), it defines the postfix increment operator ++ 1356 // for objects of that type. When the postfix increment is 1357 // called as a result of using the ++ operator, the int 1358 // argument will have value zero. 1359 Expr *Args[2] = { 1360 Arg, 1361 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1362 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1363 }; 1364 1365 // Build the candidate set for overloading 1366 OverloadCandidateSet CandidateSet; 1367 AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet); 1368 1369 // Perform overload resolution. 1370 OverloadCandidateSet::iterator Best; 1371 switch (BestViableFunction(CandidateSet, Best)) { 1372 case OR_Success: { 1373 // We found a built-in operator or an overloaded operator. 1374 FunctionDecl *FnDecl = Best->Function; 1375 1376 if (FnDecl) { 1377 // We matched an overloaded operator. Build a call to that 1378 // operator. 1379 1380 // Convert the arguments. 1381 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1382 if (PerformObjectArgumentInitialization(Arg, Method)) 1383 return ExprError(); 1384 } else { 1385 // Convert the arguments. 1386 if (PerformCopyInitialization(Arg, 1387 FnDecl->getParamDecl(0)->getType(), 1388 "passing")) 1389 return ExprError(); 1390 } 1391 1392 // Determine the result type 1393 QualType ResultTy 1394 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1395 ResultTy = ResultTy.getNonReferenceType(); 1396 1397 // Build the actual expression node. 1398 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1399 SourceLocation()); 1400 UsualUnaryConversions(FnExpr); 1401 1402 Input.release(); 1403 return Owned(new (Context) CXXOperatorCallExpr(Context, OverOp, FnExpr, 1404 Args, 2, ResultTy, 1405 OpLoc)); 1406 } else { 1407 // We matched a built-in operator. Convert the arguments, then 1408 // break out so that we will build the appropriate built-in 1409 // operator node. 1410 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1411 "passing")) 1412 return ExprError(); 1413 1414 break; 1415 } 1416 } 1417 1418 case OR_No_Viable_Function: 1419 // No viable function; fall through to handling this as a 1420 // built-in operator, which will produce an error message for us. 1421 break; 1422 1423 case OR_Ambiguous: 1424 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1425 << UnaryOperator::getOpcodeStr(Opc) 1426 << Arg->getSourceRange(); 1427 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1428 return ExprError(); 1429 1430 case OR_Deleted: 1431 Diag(OpLoc, diag::err_ovl_deleted_oper) 1432 << Best->Function->isDeleted() 1433 << UnaryOperator::getOpcodeStr(Opc) 1434 << Arg->getSourceRange(); 1435 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1436 return ExprError(); 1437 } 1438 1439 // Either we found no viable overloaded operator or we matched a 1440 // built-in operator. In either case, fall through to trying to 1441 // build a built-in operation. 1442 } 1443 1444 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1445 Opc == UnaryOperator::PostInc); 1446 if (result.isNull()) 1447 return ExprError(); 1448 Input.release(); 1449 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1450} 1451 1452Action::OwningExprResult 1453Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1454 ExprArg Idx, SourceLocation RLoc) { 1455 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1456 *RHSExp = static_cast<Expr*>(Idx.get()); 1457 1458 if (getLangOptions().CPlusPlus && 1459 (LHSExp->getType()->isRecordType() || 1460 LHSExp->getType()->isEnumeralType() || 1461 RHSExp->getType()->isRecordType() || 1462 RHSExp->getType()->isEnumeralType())) { 1463 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1464 // to the candidate set. 1465 OverloadCandidateSet CandidateSet; 1466 Expr *Args[2] = { LHSExp, RHSExp }; 1467 AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1468 SourceRange(LLoc, RLoc)); 1469 1470 // Perform overload resolution. 1471 OverloadCandidateSet::iterator Best; 1472 switch (BestViableFunction(CandidateSet, Best)) { 1473 case OR_Success: { 1474 // We found a built-in operator or an overloaded operator. 1475 FunctionDecl *FnDecl = Best->Function; 1476 1477 if (FnDecl) { 1478 // We matched an overloaded operator. Build a call to that 1479 // operator. 1480 1481 // Convert the arguments. 1482 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1483 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1484 PerformCopyInitialization(RHSExp, 1485 FnDecl->getParamDecl(0)->getType(), 1486 "passing")) 1487 return ExprError(); 1488 } else { 1489 // Convert the arguments. 1490 if (PerformCopyInitialization(LHSExp, 1491 FnDecl->getParamDecl(0)->getType(), 1492 "passing") || 1493 PerformCopyInitialization(RHSExp, 1494 FnDecl->getParamDecl(1)->getType(), 1495 "passing")) 1496 return ExprError(); 1497 } 1498 1499 // Determine the result type 1500 QualType ResultTy 1501 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1502 ResultTy = ResultTy.getNonReferenceType(); 1503 1504 // Build the actual expression node. 1505 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1506 SourceLocation()); 1507 UsualUnaryConversions(FnExpr); 1508 1509 Base.release(); 1510 Idx.release(); 1511 return Owned(new (Context) CXXOperatorCallExpr(Context, OO_Subscript, 1512 FnExpr, Args, 2, 1513 ResultTy, LLoc)); 1514 } else { 1515 // We matched a built-in operator. Convert the arguments, then 1516 // break out so that we will build the appropriate built-in 1517 // operator node. 1518 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1519 "passing") || 1520 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1521 "passing")) 1522 return ExprError(); 1523 1524 break; 1525 } 1526 } 1527 1528 case OR_No_Viable_Function: 1529 // No viable function; fall through to handling this as a 1530 // built-in operator, which will produce an error message for us. 1531 break; 1532 1533 case OR_Ambiguous: 1534 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1535 << "[]" 1536 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1537 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1538 return ExprError(); 1539 1540 case OR_Deleted: 1541 Diag(LLoc, diag::err_ovl_deleted_oper) 1542 << Best->Function->isDeleted() 1543 << "[]" 1544 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1545 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1546 return ExprError(); 1547 } 1548 1549 // Either we found no viable overloaded operator or we matched a 1550 // built-in operator. In either case, fall through to trying to 1551 // build a built-in operation. 1552 } 1553 1554 // Perform default conversions. 1555 DefaultFunctionArrayConversion(LHSExp); 1556 DefaultFunctionArrayConversion(RHSExp); 1557 1558 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1559 1560 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1561 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1562 // in the subscript position. As a result, we need to derive the array base 1563 // and index from the expression types. 1564 Expr *BaseExpr, *IndexExpr; 1565 QualType ResultType; 1566 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1567 BaseExpr = LHSExp; 1568 IndexExpr = RHSExp; 1569 ResultType = Context.DependentTy; 1570 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1571 BaseExpr = LHSExp; 1572 IndexExpr = RHSExp; 1573 // FIXME: need to deal with const... 1574 ResultType = PTy->getPointeeType(); 1575 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1576 // Handle the uncommon case of "123[Ptr]". 1577 BaseExpr = RHSExp; 1578 IndexExpr = LHSExp; 1579 // FIXME: need to deal with const... 1580 ResultType = PTy->getPointeeType(); 1581 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1582 BaseExpr = LHSExp; // vectors: V[123] 1583 IndexExpr = RHSExp; 1584 1585 // FIXME: need to deal with const... 1586 ResultType = VTy->getElementType(); 1587 } else { 1588 return ExprError(Diag(LHSExp->getLocStart(), 1589 diag::err_typecheck_subscript_value) << RHSExp->getSourceRange()); 1590 } 1591 // C99 6.5.2.1p1 1592 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1593 return ExprError(Diag(IndexExpr->getLocStart(), 1594 diag::err_typecheck_subscript) << IndexExpr->getSourceRange()); 1595 1596 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". Similarly, 1597 // C++ [expr.sub]p1: The type "T" shall be a completely-defined object 1598 // type. Note that Functions are not objects, and that (in C99 parlance) 1599 // incomplete types are not object types. 1600 if (ResultType->isFunctionType()) { 1601 Diag(BaseExpr->getLocStart(), diag::err_subscript_function_type) 1602 << ResultType << BaseExpr->getSourceRange(); 1603 return ExprError(); 1604 } 1605 if (!ResultType->isDependentType() && 1606 RequireCompleteType(BaseExpr->getLocStart(), ResultType, 1607 diag::err_subscript_incomplete_type, 1608 BaseExpr->getSourceRange())) 1609 return ExprError(); 1610 1611 Base.release(); 1612 Idx.release(); 1613 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1614 ResultType, RLoc)); 1615} 1616 1617QualType Sema:: 1618CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1619 IdentifierInfo &CompName, SourceLocation CompLoc) { 1620 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1621 1622 // The vector accessor can't exceed the number of elements. 1623 const char *compStr = CompName.getName(); 1624 1625 // This flag determines whether or not the component is one of the four 1626 // special names that indicate a subset of exactly half the elements are 1627 // to be selected. 1628 bool HalvingSwizzle = false; 1629 1630 // This flag determines whether or not CompName has an 's' char prefix, 1631 // indicating that it is a string of hex values to be used as vector indices. 1632 bool HexSwizzle = *compStr == 's'; 1633 1634 // Check that we've found one of the special components, or that the component 1635 // names must come from the same set. 1636 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1637 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1638 HalvingSwizzle = true; 1639 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1640 do 1641 compStr++; 1642 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1643 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1644 do 1645 compStr++; 1646 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1647 } 1648 1649 if (!HalvingSwizzle && *compStr) { 1650 // We didn't get to the end of the string. This means the component names 1651 // didn't come from the same set *or* we encountered an illegal name. 1652 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1653 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1654 return QualType(); 1655 } 1656 1657 // Ensure no component accessor exceeds the width of the vector type it 1658 // operates on. 1659 if (!HalvingSwizzle) { 1660 compStr = CompName.getName(); 1661 1662 if (HexSwizzle) 1663 compStr++; 1664 1665 while (*compStr) { 1666 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1667 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1668 << baseType << SourceRange(CompLoc); 1669 return QualType(); 1670 } 1671 } 1672 } 1673 1674 // If this is a halving swizzle, verify that the base type has an even 1675 // number of elements. 1676 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1677 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1678 << baseType << SourceRange(CompLoc); 1679 return QualType(); 1680 } 1681 1682 // The component accessor looks fine - now we need to compute the actual type. 1683 // The vector type is implied by the component accessor. For example, 1684 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1685 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1686 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1687 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1688 : CompName.getLength(); 1689 if (HexSwizzle) 1690 CompSize--; 1691 1692 if (CompSize == 1) 1693 return vecType->getElementType(); 1694 1695 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1696 // Now look up the TypeDefDecl from the vector type. Without this, 1697 // diagostics look bad. We want extended vector types to appear built-in. 1698 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1699 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1700 return Context.getTypedefType(ExtVectorDecls[i]); 1701 } 1702 return VT; // should never get here (a typedef type should always be found). 1703} 1704 1705static Decl *FindGetterNameDeclFromProtocolList(const ObjCProtocolDecl*PDecl, 1706 IdentifierInfo &Member, 1707 const Selector &Sel) { 1708 1709 if (ObjCPropertyDecl *PD = PDecl->FindPropertyDeclaration(&Member)) 1710 return PD; 1711 if (ObjCMethodDecl *OMD = PDecl->getInstanceMethod(Sel)) 1712 return OMD; 1713 1714 for (ObjCProtocolDecl::protocol_iterator I = PDecl->protocol_begin(), 1715 E = PDecl->protocol_end(); I != E; ++I) { 1716 if (Decl *D = FindGetterNameDeclFromProtocolList(*I, Member, Sel)) 1717 return D; 1718 } 1719 return 0; 1720} 1721 1722static Decl *FindGetterNameDecl(const ObjCQualifiedIdType *QIdTy, 1723 IdentifierInfo &Member, 1724 const Selector &Sel) { 1725 // Check protocols on qualified interfaces. 1726 Decl *GDecl = 0; 1727 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1728 E = QIdTy->qual_end(); I != E; ++I) { 1729 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1730 GDecl = PD; 1731 break; 1732 } 1733 // Also must look for a getter name which uses property syntax. 1734 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1735 GDecl = OMD; 1736 break; 1737 } 1738 } 1739 if (!GDecl) { 1740 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1741 E = QIdTy->qual_end(); I != E; ++I) { 1742 // Search in the protocol-qualifier list of current protocol. 1743 GDecl = FindGetterNameDeclFromProtocolList(*I, Member, Sel); 1744 if (GDecl) 1745 return GDecl; 1746 } 1747 } 1748 return GDecl; 1749} 1750 1751Action::OwningExprResult 1752Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1753 tok::TokenKind OpKind, SourceLocation MemberLoc, 1754 IdentifierInfo &Member, 1755 DeclTy *ObjCImpDecl) { 1756 Expr *BaseExpr = static_cast<Expr *>(Base.release()); 1757 assert(BaseExpr && "no record expression"); 1758 1759 // Perform default conversions. 1760 DefaultFunctionArrayConversion(BaseExpr); 1761 1762 QualType BaseType = BaseExpr->getType(); 1763 assert(!BaseType.isNull() && "no type for member expression"); 1764 1765 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1766 // must have pointer type, and the accessed type is the pointee. 1767 if (OpKind == tok::arrow) { 1768 if (const PointerType *PT = BaseType->getAsPointerType()) 1769 BaseType = PT->getPointeeType(); 1770 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1771 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1772 MemberLoc, Member)); 1773 else 1774 return ExprError(Diag(MemberLoc, 1775 diag::err_typecheck_member_reference_arrow) 1776 << BaseType << BaseExpr->getSourceRange()); 1777 } 1778 1779 // Handle field access to simple records. This also handles access to fields 1780 // of the ObjC 'id' struct. 1781 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1782 RecordDecl *RDecl = RTy->getDecl(); 1783 if (RequireCompleteType(OpLoc, BaseType, 1784 diag::err_typecheck_incomplete_tag, 1785 BaseExpr->getSourceRange())) 1786 return ExprError(); 1787 1788 // The record definition is complete, now make sure the member is valid. 1789 // FIXME: Qualified name lookup for C++ is a bit more complicated 1790 // than this. 1791 LookupResult Result 1792 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1793 LookupMemberName, false); 1794 1795 NamedDecl *MemberDecl = 0; 1796 if (!Result) 1797 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1798 << &Member << BaseExpr->getSourceRange()); 1799 else if (Result.isAmbiguous()) { 1800 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1801 MemberLoc, BaseExpr->getSourceRange()); 1802 return ExprError(); 1803 } else 1804 MemberDecl = Result; 1805 1806 // If the decl being referenced had an error, return an error for this 1807 // sub-expr without emitting another error, in order to avoid cascading 1808 // error cases. 1809 if (MemberDecl->isInvalidDecl()) 1810 return ExprError(); 1811 1812 // Check the use of this field 1813 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 1814 return ExprError(); 1815 1816 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1817 // We may have found a field within an anonymous union or struct 1818 // (C++ [class.union]). 1819 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1820 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1821 BaseExpr, OpLoc); 1822 1823 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1824 // FIXME: Handle address space modifiers 1825 QualType MemberType = FD->getType(); 1826 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1827 MemberType = Ref->getPointeeType(); 1828 else { 1829 unsigned combinedQualifiers = 1830 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1831 if (FD->isMutable()) 1832 combinedQualifiers &= ~QualType::Const; 1833 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1834 } 1835 1836 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1837 MemberLoc, MemberType)); 1838 } else if (VarDecl *Var = dyn_cast<VarDecl>(MemberDecl)) 1839 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1840 Var, MemberLoc, 1841 Var->getType().getNonReferenceType())); 1842 else if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 1843 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1844 MemberFn, MemberLoc, MemberFn->getType())); 1845 else if (OverloadedFunctionDecl *Ovl 1846 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 1847 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 1848 MemberLoc, Context.OverloadTy)); 1849 else if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 1850 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1851 Enum, MemberLoc, Enum->getType())); 1852 else if (isa<TypeDecl>(MemberDecl)) 1853 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 1854 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1855 1856 // We found a declaration kind that we didn't expect. This is a 1857 // generic error message that tells the user that she can't refer 1858 // to this member with '.' or '->'. 1859 return ExprError(Diag(MemberLoc, 1860 diag::err_typecheck_member_reference_unknown) 1861 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1862 } 1863 1864 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1865 // (*Obj).ivar. 1866 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1867 ObjCInterfaceDecl *ClassDeclared; 1868 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member, 1869 ClassDeclared)) { 1870 // If the decl being referenced had an error, return an error for this 1871 // sub-expr without emitting another error, in order to avoid cascading 1872 // error cases. 1873 if (IV->isInvalidDecl()) 1874 return ExprError(); 1875 1876 // Check whether we can reference this field. 1877 if (DiagnoseUseOfDecl(IV, MemberLoc)) 1878 return ExprError(); 1879 if (IV->getAccessControl() != ObjCIvarDecl::Public) { 1880 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 1881 if (ObjCMethodDecl *MD = getCurMethodDecl()) 1882 ClassOfMethodDecl = MD->getClassInterface(); 1883 else if (ObjCImpDecl && getCurFunctionDecl()) { 1884 // Case of a c-function declared inside an objc implementation. 1885 // FIXME: For a c-style function nested inside an objc implementation 1886 // class, there is no implementation context available, so we pass down 1887 // the context as argument to this routine. Ideally, this context need 1888 // be passed down in the AST node and somehow calculated from the AST 1889 // for a function decl. 1890 Decl *ImplDecl = static_cast<Decl *>(ObjCImpDecl); 1891 if (ObjCImplementationDecl *IMPD = 1892 dyn_cast<ObjCImplementationDecl>(ImplDecl)) 1893 ClassOfMethodDecl = IMPD->getClassInterface(); 1894 else if (ObjCCategoryImplDecl* CatImplClass = 1895 dyn_cast<ObjCCategoryImplDecl>(ImplDecl)) 1896 ClassOfMethodDecl = CatImplClass->getClassInterface(); 1897 } 1898 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 1899 if (ClassDeclared != IFTy->getDecl() || 1900 ClassOfMethodDecl != ClassDeclared) 1901 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 1902 } 1903 // @protected 1904 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 1905 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 1906 } 1907 1908 ObjCIvarRefExpr *MRef= new (Context) ObjCIvarRefExpr(IV, IV->getType(), 1909 MemberLoc, BaseExpr, 1910 OpKind == tok::arrow); 1911 Context.setFieldDecl(IFTy->getDecl(), IV, MRef); 1912 return Owned(MRef); 1913 } 1914 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1915 << IFTy->getDecl()->getDeclName() << &Member 1916 << BaseExpr->getSourceRange()); 1917 } 1918 1919 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1920 // pointer to a (potentially qualified) interface type. 1921 const PointerType *PTy; 1922 const ObjCInterfaceType *IFTy; 1923 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1924 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1925 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1926 1927 // Search for a declared property first. 1928 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) { 1929 // Check whether we can reference this property. 1930 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1931 return ExprError(); 1932 1933 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1934 MemberLoc, BaseExpr)); 1935 } 1936 1937 // Check protocols on qualified interfaces. 1938 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1939 E = IFTy->qual_end(); I != E; ++I) 1940 if (ObjCPropertyDecl *PD = (*I)->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 // If that failed, look for an "implicit" property by seeing if the nullary 1950 // selector is implemented. 1951 1952 // FIXME: The logic for looking up nullary and unary selectors should be 1953 // shared with the code in ActOnInstanceMessage. 1954 1955 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1956 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1957 1958 // If this reference is in an @implementation, check for 'private' methods. 1959 if (!Getter) 1960 if (ObjCImplementationDecl *ImpDecl = 1961 ObjCImplementations[IFace->getIdentifier()]) 1962 Getter = ImpDecl->getInstanceMethod(Sel); 1963 1964 // Look through local category implementations associated with the class. 1965 if (!Getter) { 1966 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1967 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1968 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1969 } 1970 } 1971 if (Getter) { 1972 // Check if we can reference this property. 1973 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1974 return ExprError(); 1975 } 1976 // If we found a getter then this may be a valid dot-reference, we 1977 // will look for the matching setter, in case it is needed. 1978 Selector SetterSel = 1979 SelectorTable::constructSetterName(PP.getIdentifierTable(), 1980 PP.getSelectorTable(), &Member); 1981 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1982 if (!Setter) { 1983 // If this reference is in an @implementation, also check for 'private' 1984 // methods. 1985 if (ObjCImplementationDecl *ImpDecl = 1986 ObjCImplementations[IFace->getIdentifier()]) 1987 Setter = ImpDecl->getInstanceMethod(SetterSel); 1988 } 1989 // Look through local category implementations associated with the class. 1990 if (!Setter) { 1991 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 1992 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1993 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 1994 } 1995 } 1996 1997 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1998 return ExprError(); 1999 2000 if (Getter || Setter) { 2001 QualType PType; 2002 2003 if (Getter) 2004 PType = Getter->getResultType(); 2005 else { 2006 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2007 E = Setter->param_end(); PI != E; ++PI) 2008 PType = (*PI)->getType(); 2009 } 2010 // FIXME: we must check that the setter has property type. 2011 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2012 Setter, MemberLoc, BaseExpr)); 2013 } 2014 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2015 << &Member << BaseType); 2016 } 2017 // Handle properties on qualified "id" protocols. 2018 const ObjCQualifiedIdType *QIdTy; 2019 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 2020 // Check protocols on qualified interfaces. 2021 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2022 if (Decl *PMDecl = FindGetterNameDecl(QIdTy, Member, Sel)) { 2023 if (ObjCPropertyDecl *PD = dyn_cast<ObjCPropertyDecl>(PMDecl)) { 2024 // Check the use of this declaration 2025 if (DiagnoseUseOfDecl(PD, MemberLoc)) 2026 return ExprError(); 2027 2028 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 2029 MemberLoc, BaseExpr)); 2030 } 2031 if (ObjCMethodDecl *OMD = dyn_cast<ObjCMethodDecl>(PMDecl)) { 2032 // Check the use of this method. 2033 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 2034 return ExprError(); 2035 2036 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 2037 OMD->getResultType(), 2038 OMD, OpLoc, MemberLoc, 2039 NULL, 0)); 2040 } 2041 } 2042 2043 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2044 << &Member << BaseType); 2045 } 2046 // Handle properties on ObjC 'Class' types. 2047 if (OpKind == tok::period && (BaseType == Context.getObjCClassType())) { 2048 // Also must look for a getter name which uses property syntax. 2049 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 2050 if (ObjCMethodDecl *MD = getCurMethodDecl()) { 2051 ObjCInterfaceDecl *IFace = MD->getClassInterface(); 2052 ObjCMethodDecl *Getter; 2053 // FIXME: need to also look locally in the implementation. 2054 if ((Getter = IFace->lookupClassMethod(Sel))) { 2055 // Check the use of this method. 2056 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 2057 return ExprError(); 2058 } 2059 // If we found a getter then this may be a valid dot-reference, we 2060 // will look for the matching setter, in case it is needed. 2061 Selector SetterSel = 2062 SelectorTable::constructSetterName(PP.getIdentifierTable(), 2063 PP.getSelectorTable(), &Member); 2064 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2065 if (!Setter) { 2066 // If this reference is in an @implementation, also check for 'private' 2067 // methods. 2068 if (ObjCImplementationDecl *ImpDecl = 2069 ObjCImplementations[IFace->getIdentifier()]) 2070 Setter = ImpDecl->getInstanceMethod(SetterSel); 2071 } 2072 // Look through local category implementations associated with the class. 2073 if (!Setter) { 2074 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 2075 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 2076 Setter = ObjCCategoryImpls[i]->getClassMethod(SetterSel); 2077 } 2078 } 2079 2080 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 2081 return ExprError(); 2082 2083 if (Getter || Setter) { 2084 QualType PType; 2085 2086 if (Getter) 2087 PType = Getter->getResultType(); 2088 else { 2089 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 2090 E = Setter->param_end(); PI != E; ++PI) 2091 PType = (*PI)->getType(); 2092 } 2093 // FIXME: we must check that the setter has property type. 2094 return Owned(new (Context) ObjCKVCRefExpr(Getter, PType, 2095 Setter, MemberLoc, BaseExpr)); 2096 } 2097 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 2098 << &Member << BaseType); 2099 } 2100 } 2101 2102 // Handle 'field access' to vectors, such as 'V.xx'. 2103 if (BaseType->isExtVectorType()) { 2104 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 2105 if (ret.isNull()) 2106 return ExprError(); 2107 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 2108 MemberLoc)); 2109 } 2110 2111 return ExprError(Diag(MemberLoc, 2112 diag::err_typecheck_member_reference_struct_union) 2113 << BaseType << BaseExpr->getSourceRange()); 2114} 2115 2116/// ConvertArgumentsForCall - Converts the arguments specified in 2117/// Args/NumArgs to the parameter types of the function FDecl with 2118/// function prototype Proto. Call is the call expression itself, and 2119/// Fn is the function expression. For a C++ member function, this 2120/// routine does not attempt to convert the object argument. Returns 2121/// true if the call is ill-formed. 2122bool 2123Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 2124 FunctionDecl *FDecl, 2125 const FunctionProtoType *Proto, 2126 Expr **Args, unsigned NumArgs, 2127 SourceLocation RParenLoc) { 2128 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 2129 // assignment, to the types of the corresponding parameter, ... 2130 unsigned NumArgsInProto = Proto->getNumArgs(); 2131 unsigned NumArgsToCheck = NumArgs; 2132 bool Invalid = false; 2133 2134 // If too few arguments are available (and we don't have default 2135 // arguments for the remaining parameters), don't make the call. 2136 if (NumArgs < NumArgsInProto) { 2137 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 2138 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 2139 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 2140 // Use default arguments for missing arguments 2141 NumArgsToCheck = NumArgsInProto; 2142 Call->setNumArgs(Context, NumArgsInProto); 2143 } 2144 2145 // If too many are passed and not variadic, error on the extras and drop 2146 // them. 2147 if (NumArgs > NumArgsInProto) { 2148 if (!Proto->isVariadic()) { 2149 Diag(Args[NumArgsInProto]->getLocStart(), 2150 diag::err_typecheck_call_too_many_args) 2151 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 2152 << SourceRange(Args[NumArgsInProto]->getLocStart(), 2153 Args[NumArgs-1]->getLocEnd()); 2154 // This deletes the extra arguments. 2155 Call->setNumArgs(Context, NumArgsInProto); 2156 Invalid = true; 2157 } 2158 NumArgsToCheck = NumArgsInProto; 2159 } 2160 2161 // Continue to check argument types (even if we have too few/many args). 2162 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2163 QualType ProtoArgType = Proto->getArgType(i); 2164 2165 Expr *Arg; 2166 if (i < NumArgs) { 2167 Arg = Args[i]; 2168 2169 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2170 ProtoArgType, 2171 diag::err_call_incomplete_argument, 2172 Arg->getSourceRange())) 2173 return true; 2174 2175 // Pass the argument. 2176 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2177 return true; 2178 } else 2179 // We already type-checked the argument, so we know it works. 2180 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2181 QualType ArgType = Arg->getType(); 2182 2183 Call->setArg(i, Arg); 2184 } 2185 2186 // If this is a variadic call, handle args passed through "...". 2187 if (Proto->isVariadic()) { 2188 VariadicCallType CallType = VariadicFunction; 2189 if (Fn->getType()->isBlockPointerType()) 2190 CallType = VariadicBlock; // Block 2191 else if (isa<MemberExpr>(Fn)) 2192 CallType = VariadicMethod; 2193 2194 // Promote the arguments (C99 6.5.2.2p7). 2195 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2196 Expr *Arg = Args[i]; 2197 DefaultVariadicArgumentPromotion(Arg, CallType); 2198 Call->setArg(i, Arg); 2199 } 2200 } 2201 2202 return Invalid; 2203} 2204 2205/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2206/// This provides the location of the left/right parens and a list of comma 2207/// locations. 2208Action::OwningExprResult 2209Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2210 MultiExprArg args, 2211 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2212 unsigned NumArgs = args.size(); 2213 Expr *Fn = static_cast<Expr *>(fn.release()); 2214 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2215 assert(Fn && "no function call expression"); 2216 FunctionDecl *FDecl = NULL; 2217 DeclarationName UnqualifiedName; 2218 2219 if (getLangOptions().CPlusPlus) { 2220 // Determine whether this is a dependent call inside a C++ template, 2221 // in which case we won't do any semantic analysis now. 2222 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 2223 bool Dependent = false; 2224 if (Fn->isTypeDependent()) 2225 Dependent = true; 2226 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2227 Dependent = true; 2228 2229 if (Dependent) 2230 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2231 Context.DependentTy, RParenLoc)); 2232 2233 // Determine whether this is a call to an object (C++ [over.call.object]). 2234 if (Fn->getType()->isRecordType()) 2235 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2236 CommaLocs, RParenLoc)); 2237 2238 // Determine whether this is a call to a member function. 2239 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2240 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2241 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2242 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2243 CommaLocs, RParenLoc)); 2244 } 2245 2246 // If we're directly calling a function, get the appropriate declaration. 2247 DeclRefExpr *DRExpr = NULL; 2248 Expr *FnExpr = Fn; 2249 bool ADL = true; 2250 while (true) { 2251 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2252 FnExpr = IcExpr->getSubExpr(); 2253 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2254 // Parentheses around a function disable ADL 2255 // (C++0x [basic.lookup.argdep]p1). 2256 ADL = false; 2257 FnExpr = PExpr->getSubExpr(); 2258 } else if (isa<UnaryOperator>(FnExpr) && 2259 cast<UnaryOperator>(FnExpr)->getOpcode() 2260 == UnaryOperator::AddrOf) { 2261 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2262 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2263 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2264 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2265 break; 2266 } else if (UnresolvedFunctionNameExpr *DepName 2267 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2268 UnqualifiedName = DepName->getName(); 2269 break; 2270 } else { 2271 // Any kind of name that does not refer to a declaration (or 2272 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2273 ADL = false; 2274 break; 2275 } 2276 } 2277 2278 OverloadedFunctionDecl *Ovl = 0; 2279 if (DRExpr) { 2280 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2281 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2282 } 2283 2284 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2285 // We don't perform ADL for implicit declarations of builtins. 2286 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2287 ADL = false; 2288 2289 // We don't perform ADL in C. 2290 if (!getLangOptions().CPlusPlus) 2291 ADL = false; 2292 2293 if (Ovl || ADL) { 2294 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2295 UnqualifiedName, LParenLoc, Args, 2296 NumArgs, CommaLocs, RParenLoc, ADL); 2297 if (!FDecl) 2298 return ExprError(); 2299 2300 // Update Fn to refer to the actual function selected. 2301 Expr *NewFn = 0; 2302 if (QualifiedDeclRefExpr *QDRExpr 2303 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2304 NewFn = QualifiedDeclRefExpr::Create(Context, FDecl, FDecl->getType(), 2305 QDRExpr->getLocation(), 2306 false, false, 2307 QDRExpr->getQualifierRange(), 2308 QDRExpr->begin(), 2309 QDRExpr->size()); 2310 else 2311 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2312 Fn->getSourceRange().getBegin()); 2313 Fn->Destroy(Context); 2314 Fn = NewFn; 2315 } 2316 } 2317 2318 // Promote the function operand. 2319 UsualUnaryConversions(Fn); 2320 2321 // Make the call expr early, before semantic checks. This guarantees cleanup 2322 // of arguments and function on error. 2323 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2324 Args, NumArgs, 2325 Context.BoolTy, 2326 RParenLoc)); 2327 2328 const FunctionType *FuncT; 2329 if (!Fn->getType()->isBlockPointerType()) { 2330 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2331 // have type pointer to function". 2332 const PointerType *PT = Fn->getType()->getAsPointerType(); 2333 if (PT == 0) 2334 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2335 << Fn->getType() << Fn->getSourceRange()); 2336 FuncT = PT->getPointeeType()->getAsFunctionType(); 2337 } else { // This is a block call. 2338 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2339 getAsFunctionType(); 2340 } 2341 if (FuncT == 0) 2342 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2343 << Fn->getType() << Fn->getSourceRange()); 2344 2345 // Check for a valid return type 2346 if (!FuncT->getResultType()->isVoidType() && 2347 RequireCompleteType(Fn->getSourceRange().getBegin(), 2348 FuncT->getResultType(), 2349 diag::err_call_incomplete_return, 2350 TheCall->getSourceRange())) 2351 return ExprError(); 2352 2353 // We know the result type of the call, set it. 2354 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2355 2356 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2357 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2358 RParenLoc)) 2359 return ExprError(); 2360 } else { 2361 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2362 2363 // Promote the arguments (C99 6.5.2.2p6). 2364 for (unsigned i = 0; i != NumArgs; i++) { 2365 Expr *Arg = Args[i]; 2366 DefaultArgumentPromotion(Arg); 2367 if (RequireCompleteType(Arg->getSourceRange().getBegin(), 2368 Arg->getType(), 2369 diag::err_call_incomplete_argument, 2370 Arg->getSourceRange())) 2371 return ExprError(); 2372 TheCall->setArg(i, Arg); 2373 } 2374 } 2375 2376 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2377 if (!Method->isStatic()) 2378 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2379 << Fn->getSourceRange()); 2380 2381 // Do special checking on direct calls to functions. 2382 if (FDecl) 2383 return CheckFunctionCall(FDecl, TheCall.take()); 2384 2385 return Owned(TheCall.take()); 2386} 2387 2388Action::OwningExprResult 2389Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2390 SourceLocation RParenLoc, ExprArg InitExpr) { 2391 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2392 QualType literalType = QualType::getFromOpaquePtr(Ty); 2393 // FIXME: put back this assert when initializers are worked out. 2394 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2395 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2396 2397 if (literalType->isArrayType()) { 2398 if (literalType->isVariableArrayType()) 2399 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2400 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2401 } else if (RequireCompleteType(LParenLoc, literalType, 2402 diag::err_typecheck_decl_incomplete_type, 2403 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2404 return ExprError(); 2405 2406 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2407 DeclarationName(), /*FIXME:DirectInit=*/false)) 2408 return ExprError(); 2409 2410 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2411 if (isFileScope) { // 6.5.2.5p3 2412 if (CheckForConstantInitializer(literalExpr, literalType)) 2413 return ExprError(); 2414 } 2415 InitExpr.release(); 2416 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2417 literalExpr, isFileScope)); 2418} 2419 2420Action::OwningExprResult 2421Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2422 SourceLocation RBraceLoc) { 2423 unsigned NumInit = initlist.size(); 2424 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2425 2426 // Semantic analysis for initializers is done by ActOnDeclarator() and 2427 // CheckInitializer() - it requires knowledge of the object being intialized. 2428 2429 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2430 RBraceLoc); 2431 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2432 return Owned(E); 2433} 2434 2435/// CheckCastTypes - Check type constraints for casting between types. 2436bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2437 UsualUnaryConversions(castExpr); 2438 2439 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2440 // type needs to be scalar. 2441 if (castType->isVoidType()) { 2442 // Cast to void allows any expr type. 2443 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2444 // We can't check any more until template instantiation time. 2445 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2446 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2447 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2448 (castType->isStructureType() || castType->isUnionType())) { 2449 // GCC struct/union extension: allow cast to self. 2450 // FIXME: Check that the cast destination type is complete. 2451 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2452 << castType << castExpr->getSourceRange(); 2453 } else if (castType->isUnionType()) { 2454 // GCC cast to union extension 2455 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2456 RecordDecl::field_iterator Field, FieldEnd; 2457 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 2458 Field != FieldEnd; ++Field) { 2459 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2460 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2461 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2462 << castExpr->getSourceRange(); 2463 break; 2464 } 2465 } 2466 if (Field == FieldEnd) 2467 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2468 << castExpr->getType() << castExpr->getSourceRange(); 2469 } else { 2470 // Reject any other conversions to non-scalar types. 2471 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2472 << castType << castExpr->getSourceRange(); 2473 } 2474 } else if (!castExpr->getType()->isScalarType() && 2475 !castExpr->getType()->isVectorType()) { 2476 return Diag(castExpr->getLocStart(), 2477 diag::err_typecheck_expect_scalar_operand) 2478 << castExpr->getType() << castExpr->getSourceRange(); 2479 } else if (castExpr->getType()->isVectorType()) { 2480 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2481 return true; 2482 } else if (castType->isVectorType()) { 2483 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2484 return true; 2485 } else if (getLangOptions().ObjC1 && isa<ObjCSuperExpr>(castExpr)) { 2486 return Diag(castExpr->getLocStart(), diag::err_illegal_super_cast) << TyR; 2487 } 2488 return false; 2489} 2490 2491bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2492 assert(VectorTy->isVectorType() && "Not a vector type!"); 2493 2494 if (Ty->isVectorType() || Ty->isIntegerType()) { 2495 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2496 return Diag(R.getBegin(), 2497 Ty->isVectorType() ? 2498 diag::err_invalid_conversion_between_vectors : 2499 diag::err_invalid_conversion_between_vector_and_integer) 2500 << VectorTy << Ty << R; 2501 } else 2502 return Diag(R.getBegin(), 2503 diag::err_invalid_conversion_between_vector_and_scalar) 2504 << VectorTy << Ty << R; 2505 2506 return false; 2507} 2508 2509Action::OwningExprResult 2510Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2511 SourceLocation RParenLoc, ExprArg Op) { 2512 assert((Ty != 0) && (Op.get() != 0) && 2513 "ActOnCastExpr(): missing type or expr"); 2514 2515 Expr *castExpr = static_cast<Expr*>(Op.release()); 2516 QualType castType = QualType::getFromOpaquePtr(Ty); 2517 2518 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2519 return ExprError(); 2520 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2521 LParenLoc, RParenLoc)); 2522} 2523 2524/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2525/// In that case, lhs = cond. 2526/// C99 6.5.15 2527QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2528 SourceLocation QuestionLoc) { 2529 UsualUnaryConversions(Cond); 2530 UsualUnaryConversions(LHS); 2531 UsualUnaryConversions(RHS); 2532 QualType CondTy = Cond->getType(); 2533 QualType LHSTy = LHS->getType(); 2534 QualType RHSTy = RHS->getType(); 2535 2536 // first, check the condition. 2537 if (!Cond->isTypeDependent()) { 2538 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2539 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2540 << CondTy; 2541 return QualType(); 2542 } 2543 } 2544 2545 // Now check the two expressions. 2546 if ((LHS && LHS->isTypeDependent()) || (RHS && RHS->isTypeDependent())) 2547 return Context.DependentTy; 2548 2549 // If both operands have arithmetic type, do the usual arithmetic conversions 2550 // to find a common type: C99 6.5.15p3,5. 2551 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2552 UsualArithmeticConversions(LHS, RHS); 2553 return LHS->getType(); 2554 } 2555 2556 // If both operands are the same structure or union type, the result is that 2557 // type. 2558 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2559 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2560 if (LHSRT->getDecl() == RHSRT->getDecl()) 2561 // "If both the operands have structure or union type, the result has 2562 // that type." This implies that CV qualifiers are dropped. 2563 return LHSTy.getUnqualifiedType(); 2564 // FIXME: Type of conditional expression must be complete in C mode. 2565 } 2566 2567 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2568 // The following || allows only one side to be void (a GCC-ism). 2569 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2570 if (!LHSTy->isVoidType()) 2571 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2572 << RHS->getSourceRange(); 2573 if (!RHSTy->isVoidType()) 2574 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2575 << LHS->getSourceRange(); 2576 ImpCastExprToType(LHS, Context.VoidTy); 2577 ImpCastExprToType(RHS, Context.VoidTy); 2578 return Context.VoidTy; 2579 } 2580 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2581 // the type of the other operand." 2582 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2583 Context.isObjCObjectPointerType(LHSTy)) && 2584 RHS->isNullPointerConstant(Context)) { 2585 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2586 return LHSTy; 2587 } 2588 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2589 Context.isObjCObjectPointerType(RHSTy)) && 2590 LHS->isNullPointerConstant(Context)) { 2591 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2592 return RHSTy; 2593 } 2594 2595 // Handle the case where both operands are pointers before we handle null 2596 // pointer constants in case both operands are null pointer constants. 2597 if (const PointerType *LHSPT = LHSTy->getAsPointerType()) { // C99 6.5.15p3,6 2598 if (const PointerType *RHSPT = RHSTy->getAsPointerType()) { 2599 // get the "pointed to" types 2600 QualType lhptee = LHSPT->getPointeeType(); 2601 QualType rhptee = RHSPT->getPointeeType(); 2602 2603 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2604 if (lhptee->isVoidType() && 2605 rhptee->isIncompleteOrObjectType()) { 2606 // Figure out necessary qualifiers (C99 6.5.15p6) 2607 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2608 QualType destType = Context.getPointerType(destPointee); 2609 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2610 ImpCastExprToType(RHS, destType); // promote to void* 2611 return destType; 2612 } 2613 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2614 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2615 QualType destType = Context.getPointerType(destPointee); 2616 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2617 ImpCastExprToType(RHS, destType); // promote to void* 2618 return destType; 2619 } 2620 2621 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2622 // Two identical pointer types are always compatible. 2623 return LHSTy; 2624 } 2625 2626 QualType compositeType = LHSTy; 2627 2628 // If either type is an Objective-C object type then check 2629 // compatibility according to Objective-C. 2630 if (Context.isObjCObjectPointerType(LHSTy) || 2631 Context.isObjCObjectPointerType(RHSTy)) { 2632 // If both operands are interfaces and either operand can be 2633 // assigned to the other, use that type as the composite 2634 // type. This allows 2635 // xxx ? (A*) a : (B*) b 2636 // where B is a subclass of A. 2637 // 2638 // Additionally, as for assignment, if either type is 'id' 2639 // allow silent coercion. Finally, if the types are 2640 // incompatible then make sure to use 'id' as the composite 2641 // type so the result is acceptable for sending messages to. 2642 2643 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2644 // It could return the composite type. 2645 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2646 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2647 if (LHSIface && RHSIface && 2648 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2649 compositeType = LHSTy; 2650 } else if (LHSIface && RHSIface && 2651 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2652 compositeType = RHSTy; 2653 } else if (Context.isObjCIdStructType(lhptee) || 2654 Context.isObjCIdStructType(rhptee)) { 2655 compositeType = Context.getObjCIdType(); 2656 } else { 2657 Diag(QuestionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2658 << LHSTy << RHSTy 2659 << LHS->getSourceRange() << RHS->getSourceRange(); 2660 QualType incompatTy = Context.getObjCIdType(); 2661 ImpCastExprToType(LHS, incompatTy); 2662 ImpCastExprToType(RHS, incompatTy); 2663 return incompatTy; 2664 } 2665 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2666 rhptee.getUnqualifiedType())) { 2667 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2668 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2669 // In this situation, we assume void* type. No especially good 2670 // reason, but this is what gcc does, and we do have to pick 2671 // to get a consistent AST. 2672 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2673 ImpCastExprToType(LHS, incompatTy); 2674 ImpCastExprToType(RHS, incompatTy); 2675 return incompatTy; 2676 } 2677 // The pointer types are compatible. 2678 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2679 // differently qualified versions of compatible types, the result type is 2680 // a pointer to an appropriately qualified version of the *composite* 2681 // type. 2682 // FIXME: Need to calculate the composite type. 2683 // FIXME: Need to add qualifiers 2684 ImpCastExprToType(LHS, compositeType); 2685 ImpCastExprToType(RHS, compositeType); 2686 return compositeType; 2687 } 2688 } 2689 2690 // Selection between block pointer types is ok as long as they are the same. 2691 if (LHSTy->isBlockPointerType() && RHSTy->isBlockPointerType() && 2692 Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) 2693 return LHSTy; 2694 2695 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2696 // evaluates to "struct objc_object *" (and is handled above when comparing 2697 // id with statically typed objects). 2698 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 2699 // GCC allows qualified id and any Objective-C type to devolve to 2700 // id. Currently localizing to here until clear this should be 2701 // part of ObjCQualifiedIdTypesAreCompatible. 2702 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 2703 (LHSTy->isObjCQualifiedIdType() && 2704 Context.isObjCObjectPointerType(RHSTy)) || 2705 (RHSTy->isObjCQualifiedIdType() && 2706 Context.isObjCObjectPointerType(LHSTy))) { 2707 // FIXME: This is not the correct composite type. This only 2708 // happens to work because id can more or less be used anywhere, 2709 // however this may change the type of method sends. 2710 // FIXME: gcc adds some type-checking of the arguments and emits 2711 // (confusing) incompatible comparison warnings in some 2712 // cases. Investigate. 2713 QualType compositeType = Context.getObjCIdType(); 2714 ImpCastExprToType(LHS, compositeType); 2715 ImpCastExprToType(RHS, compositeType); 2716 return compositeType; 2717 } 2718 } 2719 2720 // Otherwise, the operands are not compatible. 2721 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2722 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2723 return QualType(); 2724} 2725 2726/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2727/// in the case of a the GNU conditional expr extension. 2728Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2729 SourceLocation ColonLoc, 2730 ExprArg Cond, ExprArg LHS, 2731 ExprArg RHS) { 2732 Expr *CondExpr = (Expr *) Cond.get(); 2733 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2734 2735 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2736 // was the condition. 2737 bool isLHSNull = LHSExpr == 0; 2738 if (isLHSNull) 2739 LHSExpr = CondExpr; 2740 2741 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2742 RHSExpr, QuestionLoc); 2743 if (result.isNull()) 2744 return ExprError(); 2745 2746 Cond.release(); 2747 LHS.release(); 2748 RHS.release(); 2749 return Owned(new (Context) ConditionalOperator(CondExpr, 2750 isLHSNull ? 0 : LHSExpr, 2751 RHSExpr, result)); 2752} 2753 2754 2755// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2756// being closely modeled after the C99 spec:-). The odd characteristic of this 2757// routine is it effectively iqnores the qualifiers on the top level pointee. 2758// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2759// FIXME: add a couple examples in this comment. 2760Sema::AssignConvertType 2761Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2762 QualType lhptee, rhptee; 2763 2764 // get the "pointed to" type (ignoring qualifiers at the top level) 2765 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2766 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2767 2768 // make sure we operate on the canonical type 2769 lhptee = Context.getCanonicalType(lhptee); 2770 rhptee = Context.getCanonicalType(rhptee); 2771 2772 AssignConvertType ConvTy = Compatible; 2773 2774 // C99 6.5.16.1p1: This following citation is common to constraints 2775 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2776 // qualifiers of the type *pointed to* by the right; 2777 // FIXME: Handle ExtQualType 2778 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2779 ConvTy = CompatiblePointerDiscardsQualifiers; 2780 2781 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2782 // incomplete type and the other is a pointer to a qualified or unqualified 2783 // version of void... 2784 if (lhptee->isVoidType()) { 2785 if (rhptee->isIncompleteOrObjectType()) 2786 return ConvTy; 2787 2788 // As an extension, we allow cast to/from void* to function pointer. 2789 assert(rhptee->isFunctionType()); 2790 return FunctionVoidPointer; 2791 } 2792 2793 if (rhptee->isVoidType()) { 2794 if (lhptee->isIncompleteOrObjectType()) 2795 return ConvTy; 2796 2797 // As an extension, we allow cast to/from void* to function pointer. 2798 assert(lhptee->isFunctionType()); 2799 return FunctionVoidPointer; 2800 } 2801 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2802 // unqualified versions of compatible types, ... 2803 lhptee = lhptee.getUnqualifiedType(); 2804 rhptee = rhptee.getUnqualifiedType(); 2805 if (!Context.typesAreCompatible(lhptee, rhptee)) { 2806 // Check if the pointee types are compatible ignoring the sign. 2807 // We explicitly check for char so that we catch "char" vs 2808 // "unsigned char" on systems where "char" is unsigned. 2809 if (lhptee->isCharType()) { 2810 lhptee = Context.UnsignedCharTy; 2811 } else if (lhptee->isSignedIntegerType()) { 2812 lhptee = Context.getCorrespondingUnsignedType(lhptee); 2813 } 2814 if (rhptee->isCharType()) { 2815 rhptee = Context.UnsignedCharTy; 2816 } else if (rhptee->isSignedIntegerType()) { 2817 rhptee = Context.getCorrespondingUnsignedType(rhptee); 2818 } 2819 if (lhptee == rhptee) { 2820 // Types are compatible ignoring the sign. Qualifier incompatibility 2821 // takes priority over sign incompatibility because the sign 2822 // warning can be disabled. 2823 if (ConvTy != Compatible) 2824 return ConvTy; 2825 return IncompatiblePointerSign; 2826 } 2827 // General pointer incompatibility takes priority over qualifiers. 2828 return IncompatiblePointer; 2829 } 2830 return ConvTy; 2831} 2832 2833/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2834/// block pointer types are compatible or whether a block and normal pointer 2835/// are compatible. It is more restrict than comparing two function pointer 2836// types. 2837Sema::AssignConvertType 2838Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2839 QualType rhsType) { 2840 QualType lhptee, rhptee; 2841 2842 // get the "pointed to" type (ignoring qualifiers at the top level) 2843 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2844 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2845 2846 // make sure we operate on the canonical type 2847 lhptee = Context.getCanonicalType(lhptee); 2848 rhptee = Context.getCanonicalType(rhptee); 2849 2850 AssignConvertType ConvTy = Compatible; 2851 2852 // For blocks we enforce that qualifiers are identical. 2853 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2854 ConvTy = CompatiblePointerDiscardsQualifiers; 2855 2856 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2857 return IncompatibleBlockPointer; 2858 return ConvTy; 2859} 2860 2861/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2862/// has code to accommodate several GCC extensions when type checking 2863/// pointers. Here are some objectionable examples that GCC considers warnings: 2864/// 2865/// int a, *pint; 2866/// short *pshort; 2867/// struct foo *pfoo; 2868/// 2869/// pint = pshort; // warning: assignment from incompatible pointer type 2870/// a = pint; // warning: assignment makes integer from pointer without a cast 2871/// pint = a; // warning: assignment makes pointer from integer without a cast 2872/// pint = pfoo; // warning: assignment from incompatible pointer type 2873/// 2874/// As a result, the code for dealing with pointers is more complex than the 2875/// C99 spec dictates. 2876/// 2877Sema::AssignConvertType 2878Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2879 // Get canonical types. We're not formatting these types, just comparing 2880 // them. 2881 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2882 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2883 2884 if (lhsType == rhsType) 2885 return Compatible; // Common case: fast path an exact match. 2886 2887 // If the left-hand side is a reference type, then we are in a 2888 // (rare!) case where we've allowed the use of references in C, 2889 // e.g., as a parameter type in a built-in function. In this case, 2890 // just make sure that the type referenced is compatible with the 2891 // right-hand side type. The caller is responsible for adjusting 2892 // lhsType so that the resulting expression does not have reference 2893 // type. 2894 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2895 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2896 return Compatible; 2897 return Incompatible; 2898 } 2899 2900 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 2901 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 2902 return Compatible; 2903 // Relax integer conversions like we do for pointers below. 2904 if (rhsType->isIntegerType()) 2905 return IntToPointer; 2906 if (lhsType->isIntegerType()) 2907 return PointerToInt; 2908 return IncompatibleObjCQualifiedId; 2909 } 2910 2911 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2912 // For ExtVector, allow vector splats; float -> <n x float> 2913 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2914 if (LV->getElementType() == rhsType) 2915 return Compatible; 2916 2917 // If we are allowing lax vector conversions, and LHS and RHS are both 2918 // vectors, the total size only needs to be the same. This is a bitcast; 2919 // no bits are changed but the result type is different. 2920 if (getLangOptions().LaxVectorConversions && 2921 lhsType->isVectorType() && rhsType->isVectorType()) { 2922 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2923 return IncompatibleVectors; 2924 } 2925 return Incompatible; 2926 } 2927 2928 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2929 return Compatible; 2930 2931 if (isa<PointerType>(lhsType)) { 2932 if (rhsType->isIntegerType()) 2933 return IntToPointer; 2934 2935 if (isa<PointerType>(rhsType)) 2936 return CheckPointerTypesForAssignment(lhsType, rhsType); 2937 2938 if (rhsType->getAsBlockPointerType()) { 2939 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2940 return Compatible; 2941 2942 // Treat block pointers as objects. 2943 if (getLangOptions().ObjC1 && 2944 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2945 return Compatible; 2946 } 2947 return Incompatible; 2948 } 2949 2950 if (isa<BlockPointerType>(lhsType)) { 2951 if (rhsType->isIntegerType()) 2952 return IntToBlockPointer; 2953 2954 // Treat block pointers as objects. 2955 if (getLangOptions().ObjC1 && 2956 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2957 return Compatible; 2958 2959 if (rhsType->isBlockPointerType()) 2960 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2961 2962 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2963 if (RHSPT->getPointeeType()->isVoidType()) 2964 return Compatible; 2965 } 2966 return Incompatible; 2967 } 2968 2969 if (isa<PointerType>(rhsType)) { 2970 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2971 if (lhsType == Context.BoolTy) 2972 return Compatible; 2973 2974 if (lhsType->isIntegerType()) 2975 return PointerToInt; 2976 2977 if (isa<PointerType>(lhsType)) 2978 return CheckPointerTypesForAssignment(lhsType, rhsType); 2979 2980 if (isa<BlockPointerType>(lhsType) && 2981 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2982 return Compatible; 2983 return Incompatible; 2984 } 2985 2986 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 2987 if (Context.typesAreCompatible(lhsType, rhsType)) 2988 return Compatible; 2989 } 2990 return Incompatible; 2991} 2992 2993Sema::AssignConvertType 2994Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2995 if (getLangOptions().CPlusPlus) { 2996 if (!lhsType->isRecordType()) { 2997 // C++ 5.17p3: If the left operand is not of class type, the 2998 // expression is implicitly converted (C++ 4) to the 2999 // cv-unqualified type of the left operand. 3000 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 3001 "assigning")) 3002 return Incompatible; 3003 else 3004 return Compatible; 3005 } 3006 3007 // FIXME: Currently, we fall through and treat C++ classes like C 3008 // structures. 3009 } 3010 3011 // C99 6.5.16.1p1: the left operand is a pointer and the right is 3012 // a null pointer constant. 3013 if ((lhsType->isPointerType() || 3014 lhsType->isObjCQualifiedIdType() || 3015 lhsType->isBlockPointerType()) 3016 && rExpr->isNullPointerConstant(Context)) { 3017 ImpCastExprToType(rExpr, lhsType); 3018 return Compatible; 3019 } 3020 3021 // This check seems unnatural, however it is necessary to ensure the proper 3022 // conversion of functions/arrays. If the conversion were done for all 3023 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 3024 // expressions that surpress this implicit conversion (&, sizeof). 3025 // 3026 // Suppress this for references: C++ 8.5.3p5. 3027 if (!lhsType->isReferenceType()) 3028 DefaultFunctionArrayConversion(rExpr); 3029 3030 Sema::AssignConvertType result = 3031 CheckAssignmentConstraints(lhsType, rExpr->getType()); 3032 3033 // C99 6.5.16.1p2: The value of the right operand is converted to the 3034 // type of the assignment expression. 3035 // CheckAssignmentConstraints allows the left-hand side to be a reference, 3036 // so that we can use references in built-in functions even in C. 3037 // The getNonReferenceType() call makes sure that the resulting expression 3038 // does not have reference type. 3039 if (rExpr->getType() != lhsType) 3040 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 3041 return result; 3042} 3043 3044Sema::AssignConvertType 3045Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 3046 return CheckAssignmentConstraints(lhsType, rhsType); 3047} 3048 3049QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 3050 Diag(Loc, diag::err_typecheck_invalid_operands) 3051 << lex->getType() << rex->getType() 3052 << lex->getSourceRange() << rex->getSourceRange(); 3053 return QualType(); 3054} 3055 3056inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 3057 Expr *&rex) { 3058 // For conversion purposes, we ignore any qualifiers. 3059 // For example, "const float" and "float" are equivalent. 3060 QualType lhsType = 3061 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 3062 QualType rhsType = 3063 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 3064 3065 // If the vector types are identical, return. 3066 if (lhsType == rhsType) 3067 return lhsType; 3068 3069 // Handle the case of a vector & extvector type of the same size and element 3070 // type. It would be nice if we only had one vector type someday. 3071 if (getLangOptions().LaxVectorConversions) { 3072 // FIXME: Should we warn here? 3073 if (const VectorType *LV = lhsType->getAsVectorType()) { 3074 if (const VectorType *RV = rhsType->getAsVectorType()) 3075 if (LV->getElementType() == RV->getElementType() && 3076 LV->getNumElements() == RV->getNumElements()) { 3077 return lhsType->isExtVectorType() ? lhsType : rhsType; 3078 } 3079 } 3080 } 3081 3082 // If the lhs is an extended vector and the rhs is a scalar of the same type 3083 // or a literal, promote the rhs to the vector type. 3084 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 3085 QualType eltType = V->getElementType(); 3086 3087 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 3088 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 3089 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 3090 ImpCastExprToType(rex, lhsType); 3091 return lhsType; 3092 } 3093 } 3094 3095 // If the rhs is an extended vector and the lhs is a scalar of the same type, 3096 // promote the lhs to the vector type. 3097 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 3098 QualType eltType = V->getElementType(); 3099 3100 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 3101 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 3102 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 3103 ImpCastExprToType(lex, rhsType); 3104 return rhsType; 3105 } 3106 } 3107 3108 // You cannot convert between vector values of different size. 3109 Diag(Loc, diag::err_typecheck_vector_not_convertable) 3110 << lex->getType() << rex->getType() 3111 << lex->getSourceRange() << rex->getSourceRange(); 3112 return QualType(); 3113} 3114 3115inline QualType Sema::CheckMultiplyDivideOperands( 3116 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3117{ 3118 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3119 return CheckVectorOperands(Loc, lex, rex); 3120 3121 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3122 3123 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3124 return compType; 3125 return InvalidOperands(Loc, lex, rex); 3126} 3127 3128inline QualType Sema::CheckRemainderOperands( 3129 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3130{ 3131 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 3132 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3133 return CheckVectorOperands(Loc, lex, rex); 3134 return InvalidOperands(Loc, lex, rex); 3135 } 3136 3137 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3138 3139 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3140 return compType; 3141 return InvalidOperands(Loc, lex, rex); 3142} 3143 3144inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 3145 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3146{ 3147 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3148 return CheckVectorOperands(Loc, lex, rex); 3149 3150 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3151 3152 // handle the common case first (both operands are arithmetic). 3153 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3154 return compType; 3155 3156 // Put any potential pointer into PExp 3157 Expr* PExp = lex, *IExp = rex; 3158 if (IExp->getType()->isPointerType()) 3159 std::swap(PExp, IExp); 3160 3161 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 3162 if (IExp->getType()->isIntegerType()) { 3163 // Check for arithmetic on pointers to incomplete types 3164 if (PTy->getPointeeType()->isVoidType()) { 3165 if (getLangOptions().CPlusPlus) { 3166 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3167 << lex->getSourceRange() << rex->getSourceRange(); 3168 return QualType(); 3169 } 3170 3171 // GNU extension: arithmetic on pointer to void 3172 Diag(Loc, diag::ext_gnu_void_ptr) 3173 << lex->getSourceRange() << rex->getSourceRange(); 3174 } else if (PTy->getPointeeType()->isFunctionType()) { 3175 if (getLangOptions().CPlusPlus) { 3176 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3177 << lex->getType() << lex->getSourceRange(); 3178 return QualType(); 3179 } 3180 3181 // GNU extension: arithmetic on pointer to function 3182 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3183 << lex->getType() << lex->getSourceRange(); 3184 } else if (!PTy->isDependentType() && 3185 RequireCompleteType(Loc, PTy->getPointeeType(), 3186 diag::err_typecheck_arithmetic_incomplete_type, 3187 lex->getSourceRange(), SourceRange(), 3188 lex->getType())) 3189 return QualType(); 3190 3191 return PExp->getType(); 3192 } 3193 } 3194 3195 return InvalidOperands(Loc, lex, rex); 3196} 3197 3198// C99 6.5.6 3199QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 3200 SourceLocation Loc, bool isCompAssign) { 3201 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3202 return CheckVectorOperands(Loc, lex, rex); 3203 3204 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3205 3206 // Enforce type constraints: C99 6.5.6p3. 3207 3208 // Handle the common case first (both operands are arithmetic). 3209 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3210 return compType; 3211 3212 // Either ptr - int or ptr - ptr. 3213 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3214 QualType lpointee = LHSPTy->getPointeeType(); 3215 3216 // The LHS must be an completely-defined object type. 3217 3218 bool ComplainAboutVoid = false; 3219 Expr *ComplainAboutFunc = 0; 3220 if (lpointee->isVoidType()) { 3221 if (getLangOptions().CPlusPlus) { 3222 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3223 << lex->getSourceRange() << rex->getSourceRange(); 3224 return QualType(); 3225 } 3226 3227 // GNU C extension: arithmetic on pointer to void 3228 ComplainAboutVoid = true; 3229 } else if (lpointee->isFunctionType()) { 3230 if (getLangOptions().CPlusPlus) { 3231 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3232 << lex->getType() << lex->getSourceRange(); 3233 return QualType(); 3234 } 3235 3236 // GNU C extension: arithmetic on pointer to function 3237 ComplainAboutFunc = lex; 3238 } else if (!lpointee->isDependentType() && 3239 RequireCompleteType(Loc, lpointee, 3240 diag::err_typecheck_sub_ptr_object, 3241 lex->getSourceRange(), 3242 SourceRange(), 3243 lex->getType())) 3244 return QualType(); 3245 3246 // The result type of a pointer-int computation is the pointer type. 3247 if (rex->getType()->isIntegerType()) { 3248 if (ComplainAboutVoid) 3249 Diag(Loc, diag::ext_gnu_void_ptr) 3250 << lex->getSourceRange() << rex->getSourceRange(); 3251 if (ComplainAboutFunc) 3252 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3253 << ComplainAboutFunc->getType() 3254 << ComplainAboutFunc->getSourceRange(); 3255 3256 return lex->getType(); 3257 } 3258 3259 // Handle pointer-pointer subtractions. 3260 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3261 QualType rpointee = RHSPTy->getPointeeType(); 3262 3263 // RHS must be a completely-type object type. 3264 // Handle the GNU void* extension. 3265 if (rpointee->isVoidType()) { 3266 if (getLangOptions().CPlusPlus) { 3267 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 3268 << lex->getSourceRange() << rex->getSourceRange(); 3269 return QualType(); 3270 } 3271 3272 ComplainAboutVoid = true; 3273 } else if (rpointee->isFunctionType()) { 3274 if (getLangOptions().CPlusPlus) { 3275 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3276 << rex->getType() << rex->getSourceRange(); 3277 return QualType(); 3278 } 3279 3280 // GNU extension: arithmetic on pointer to function 3281 if (!ComplainAboutFunc) 3282 ComplainAboutFunc = rex; 3283 } else if (!rpointee->isDependentType() && 3284 RequireCompleteType(Loc, rpointee, 3285 diag::err_typecheck_sub_ptr_object, 3286 rex->getSourceRange(), 3287 SourceRange(), 3288 rex->getType())) 3289 return QualType(); 3290 3291 // Pointee types must be compatible. 3292 if (!Context.typesAreCompatible( 3293 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3294 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3295 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3296 << lex->getType() << rex->getType() 3297 << lex->getSourceRange() << rex->getSourceRange(); 3298 return QualType(); 3299 } 3300 3301 if (ComplainAboutVoid) 3302 Diag(Loc, diag::ext_gnu_void_ptr) 3303 << lex->getSourceRange() << rex->getSourceRange(); 3304 if (ComplainAboutFunc) 3305 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3306 << ComplainAboutFunc->getType() 3307 << ComplainAboutFunc->getSourceRange(); 3308 3309 return Context.getPointerDiffType(); 3310 } 3311 } 3312 3313 return InvalidOperands(Loc, lex, rex); 3314} 3315 3316// C99 6.5.7 3317QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3318 bool isCompAssign) { 3319 // C99 6.5.7p2: Each of the operands shall have integer type. 3320 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3321 return InvalidOperands(Loc, lex, rex); 3322 3323 // Shifts don't perform usual arithmetic conversions, they just do integer 3324 // promotions on each operand. C99 6.5.7p3 3325 if (!isCompAssign) 3326 UsualUnaryConversions(lex); 3327 UsualUnaryConversions(rex); 3328 3329 // "The type of the result is that of the promoted left operand." 3330 return lex->getType(); 3331} 3332 3333// C99 6.5.8 3334QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3335 bool isRelational) { 3336 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3337 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3338 3339 // C99 6.5.8p3 / C99 6.5.9p4 3340 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3341 UsualArithmeticConversions(lex, rex); 3342 else { 3343 UsualUnaryConversions(lex); 3344 UsualUnaryConversions(rex); 3345 } 3346 QualType lType = lex->getType(); 3347 QualType rType = rex->getType(); 3348 3349 if (!lType->isFloatingType()) { 3350 // For non-floating point types, check for self-comparisons of the form 3351 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3352 // often indicate logic errors in the program. 3353 // NOTE: Don't warn about comparisons of enum constants. These can arise 3354 // from macro expansions, and are usually quite deliberate. 3355 Expr *LHSStripped = lex->IgnoreParens(); 3356 Expr *RHSStripped = rex->IgnoreParens(); 3357 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(LHSStripped)) 3358 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(RHSStripped)) 3359 if (DRL->getDecl() == DRR->getDecl() && 3360 !isa<EnumConstantDecl>(DRL->getDecl())) 3361 Diag(Loc, diag::warn_selfcomparison); 3362 3363 if (isa<CastExpr>(LHSStripped)) 3364 LHSStripped = LHSStripped->IgnoreParenCasts(); 3365 if (isa<CastExpr>(RHSStripped)) 3366 RHSStripped = RHSStripped->IgnoreParenCasts(); 3367 3368 // Warn about comparisons against a string constant (unless the other 3369 // operand is null), the user probably wants strcmp. 3370 if ((isa<StringLiteral>(LHSStripped) || isa<ObjCEncodeExpr>(LHSStripped)) && 3371 !RHSStripped->isNullPointerConstant(Context)) 3372 Diag(Loc, diag::warn_stringcompare) << lex->getSourceRange(); 3373 else if ((isa<StringLiteral>(RHSStripped) || 3374 isa<ObjCEncodeExpr>(RHSStripped)) && 3375 !LHSStripped->isNullPointerConstant(Context)) 3376 Diag(Loc, diag::warn_stringcompare) << rex->getSourceRange(); 3377 } 3378 3379 // The result of comparisons is 'bool' in C++, 'int' in C. 3380 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy :Context.IntTy; 3381 3382 if (isRelational) { 3383 if (lType->isRealType() && rType->isRealType()) 3384 return ResultTy; 3385 } else { 3386 // Check for comparisons of floating point operands using != and ==. 3387 if (lType->isFloatingType()) { 3388 assert(rType->isFloatingType()); 3389 CheckFloatComparison(Loc,lex,rex); 3390 } 3391 3392 if (lType->isArithmeticType() && rType->isArithmeticType()) 3393 return ResultTy; 3394 } 3395 3396 bool LHSIsNull = lex->isNullPointerConstant(Context); 3397 bool RHSIsNull = rex->isNullPointerConstant(Context); 3398 3399 // All of the following pointer related warnings are GCC extensions, except 3400 // when handling null pointer constants. One day, we can consider making them 3401 // errors (when -pedantic-errors is enabled). 3402 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3403 QualType LCanPointeeTy = 3404 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3405 QualType RCanPointeeTy = 3406 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3407 3408 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3409 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3410 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3411 RCanPointeeTy.getUnqualifiedType()) && 3412 !Context.areComparableObjCPointerTypes(lType, rType)) { 3413 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3414 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3415 } 3416 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3417 return ResultTy; 3418 } 3419 // Handle block pointer types. 3420 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 3421 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3422 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3423 3424 if (!LHSIsNull && !RHSIsNull && 3425 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3426 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3427 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3428 } 3429 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3430 return ResultTy; 3431 } 3432 // Allow block pointers to be compared with null pointer constants. 3433 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3434 (lType->isPointerType() && rType->isBlockPointerType())) { 3435 if (!LHSIsNull && !RHSIsNull) { 3436 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3437 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3438 } 3439 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3440 return ResultTy; 3441 } 3442 3443 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3444 if (lType->isPointerType() || rType->isPointerType()) { 3445 const PointerType *LPT = lType->getAsPointerType(); 3446 const PointerType *RPT = rType->getAsPointerType(); 3447 bool LPtrToVoid = LPT ? 3448 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3449 bool RPtrToVoid = RPT ? 3450 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3451 3452 if (!LPtrToVoid && !RPtrToVoid && 3453 !Context.typesAreCompatible(lType, rType)) { 3454 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3455 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3456 ImpCastExprToType(rex, lType); 3457 return ResultTy; 3458 } 3459 ImpCastExprToType(rex, lType); 3460 return ResultTy; 3461 } 3462 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3463 ImpCastExprToType(rex, lType); 3464 return ResultTy; 3465 } else { 3466 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3467 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3468 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3469 ImpCastExprToType(rex, lType); 3470 return ResultTy; 3471 } 3472 } 3473 } 3474 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3475 rType->isIntegerType()) { 3476 if (!RHSIsNull) 3477 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3478 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3479 ImpCastExprToType(rex, lType); // promote the integer to pointer 3480 return ResultTy; 3481 } 3482 if (lType->isIntegerType() && 3483 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3484 if (!LHSIsNull) 3485 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3486 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3487 ImpCastExprToType(lex, rType); // promote the integer to pointer 3488 return ResultTy; 3489 } 3490 // Handle block pointers. 3491 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3492 if (!RHSIsNull) 3493 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3494 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3495 ImpCastExprToType(rex, lType); // promote the integer to pointer 3496 return ResultTy; 3497 } 3498 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3499 if (!LHSIsNull) 3500 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3501 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3502 ImpCastExprToType(lex, rType); // promote the integer to pointer 3503 return ResultTy; 3504 } 3505 return InvalidOperands(Loc, lex, rex); 3506} 3507 3508/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3509/// operates on extended vector types. Instead of producing an IntTy result, 3510/// like a scalar comparison, a vector comparison produces a vector of integer 3511/// types. 3512QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3513 SourceLocation Loc, 3514 bool isRelational) { 3515 // Check to make sure we're operating on vectors of the same type and width, 3516 // Allowing one side to be a scalar of element type. 3517 QualType vType = CheckVectorOperands(Loc, lex, rex); 3518 if (vType.isNull()) 3519 return vType; 3520 3521 QualType lType = lex->getType(); 3522 QualType rType = rex->getType(); 3523 3524 // For non-floating point types, check for self-comparisons of the form 3525 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3526 // often indicate logic errors in the program. 3527 if (!lType->isFloatingType()) { 3528 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3529 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3530 if (DRL->getDecl() == DRR->getDecl()) 3531 Diag(Loc, diag::warn_selfcomparison); 3532 } 3533 3534 // Check for comparisons of floating point operands using != and ==. 3535 if (!isRelational && lType->isFloatingType()) { 3536 assert (rType->isFloatingType()); 3537 CheckFloatComparison(Loc,lex,rex); 3538 } 3539 3540 // Return the type for the comparison, which is the same as vector type for 3541 // integer vectors, or an integer type of identical size and number of 3542 // elements for floating point vectors. 3543 if (lType->isIntegerType()) 3544 return lType; 3545 3546 const VectorType *VTy = lType->getAsVectorType(); 3547 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3548 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3549 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3550 else if (TypeSize == Context.getTypeSize(Context.LongTy)) 3551 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3552 3553 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3554 "Unhandled vector element size in vector compare"); 3555 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3556} 3557 3558inline QualType Sema::CheckBitwiseOperands( 3559 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3560{ 3561 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3562 return CheckVectorOperands(Loc, lex, rex); 3563 3564 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3565 3566 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3567 return compType; 3568 return InvalidOperands(Loc, lex, rex); 3569} 3570 3571inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3572 Expr *&lex, Expr *&rex, SourceLocation Loc) 3573{ 3574 UsualUnaryConversions(lex); 3575 UsualUnaryConversions(rex); 3576 3577 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3578 return Context.IntTy; 3579 return InvalidOperands(Loc, lex, rex); 3580} 3581 3582/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3583/// is a read-only property; return true if so. A readonly property expression 3584/// depends on various declarations and thus must be treated specially. 3585/// 3586static bool IsReadonlyProperty(Expr *E, Sema &S) 3587{ 3588 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3589 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3590 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3591 QualType BaseType = PropExpr->getBase()->getType(); 3592 if (const PointerType *PTy = BaseType->getAsPointerType()) 3593 if (const ObjCInterfaceType *IFTy = 3594 PTy->getPointeeType()->getAsObjCInterfaceType()) 3595 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3596 if (S.isPropertyReadonly(PDecl, IFace)) 3597 return true; 3598 } 3599 } 3600 return false; 3601} 3602 3603/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3604/// emit an error and return true. If so, return false. 3605static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3606 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 3607 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3608 IsLV = Expr::MLV_ReadonlyProperty; 3609 if (IsLV == Expr::MLV_Valid) 3610 return false; 3611 3612 unsigned Diag = 0; 3613 bool NeedType = false; 3614 switch (IsLV) { // C99 6.5.16p2 3615 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3616 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3617 case Expr::MLV_ArrayType: 3618 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3619 NeedType = true; 3620 break; 3621 case Expr::MLV_NotObjectType: 3622 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3623 NeedType = true; 3624 break; 3625 case Expr::MLV_LValueCast: 3626 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3627 break; 3628 case Expr::MLV_InvalidExpression: 3629 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3630 break; 3631 case Expr::MLV_IncompleteType: 3632 case Expr::MLV_IncompleteVoidType: 3633 return S.RequireCompleteType(Loc, E->getType(), 3634 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3635 E->getSourceRange()); 3636 case Expr::MLV_DuplicateVectorComponents: 3637 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 3638 break; 3639 case Expr::MLV_NotBlockQualified: 3640 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 3641 break; 3642 case Expr::MLV_ReadonlyProperty: 3643 Diag = diag::error_readonly_property_assignment; 3644 break; 3645 case Expr::MLV_NoSetterProperty: 3646 Diag = diag::error_nosetter_property_assignment; 3647 break; 3648 } 3649 3650 if (NeedType) 3651 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 3652 else 3653 S.Diag(Loc, Diag) << E->getSourceRange(); 3654 return true; 3655} 3656 3657 3658 3659// C99 6.5.16.1 3660QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 3661 SourceLocation Loc, 3662 QualType CompoundType) { 3663 // Verify that LHS is a modifiable lvalue, and emit error if not. 3664 if (CheckForModifiableLvalue(LHS, Loc, *this)) 3665 return QualType(); 3666 3667 QualType LHSType = LHS->getType(); 3668 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 3669 3670 AssignConvertType ConvTy; 3671 if (CompoundType.isNull()) { 3672 // Simple assignment "x = y". 3673 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 3674 // Special case of NSObject attributes on c-style pointer types. 3675 if (ConvTy == IncompatiblePointer && 3676 ((Context.isObjCNSObjectType(LHSType) && 3677 Context.isObjCObjectPointerType(RHSType)) || 3678 (Context.isObjCNSObjectType(RHSType) && 3679 Context.isObjCObjectPointerType(LHSType)))) 3680 ConvTy = Compatible; 3681 3682 // If the RHS is a unary plus or minus, check to see if they = and + are 3683 // right next to each other. If so, the user may have typo'd "x =+ 4" 3684 // instead of "x += 4". 3685 Expr *RHSCheck = RHS; 3686 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 3687 RHSCheck = ICE->getSubExpr(); 3688 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 3689 if ((UO->getOpcode() == UnaryOperator::Plus || 3690 UO->getOpcode() == UnaryOperator::Minus) && 3691 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 3692 // Only if the two operators are exactly adjacent. 3693 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc() && 3694 // And there is a space or other character before the subexpr of the 3695 // unary +/-. We don't want to warn on "x=-1". 3696 Loc.getFileLocWithOffset(2) != UO->getSubExpr()->getLocStart() && 3697 UO->getSubExpr()->getLocStart().isFileID()) { 3698 Diag(Loc, diag::warn_not_compound_assign) 3699 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 3700 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 3701 } 3702 } 3703 } else { 3704 // Compound assignment "x += y" 3705 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 3706 } 3707 3708 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 3709 RHS, "assigning")) 3710 return QualType(); 3711 3712 // C99 6.5.16p3: The type of an assignment expression is the type of the 3713 // left operand unless the left operand has qualified type, in which case 3714 // it is the unqualified version of the type of the left operand. 3715 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 3716 // is converted to the type of the assignment expression (above). 3717 // C++ 5.17p1: the type of the assignment expression is that of its left 3718 // oprdu. 3719 return LHSType.getUnqualifiedType(); 3720} 3721 3722// C99 6.5.17 3723QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 3724 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 3725 DefaultFunctionArrayConversion(RHS); 3726 3727 // FIXME: Check that RHS type is complete in C mode (it's legal for it to be 3728 // incomplete in C++). 3729 3730 return RHS->getType(); 3731} 3732 3733/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 3734/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 3735QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 3736 bool isInc) { 3737 if (Op->isTypeDependent()) 3738 return Context.DependentTy; 3739 3740 QualType ResType = Op->getType(); 3741 assert(!ResType.isNull() && "no type for increment/decrement expression"); 3742 3743 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 3744 // Decrement of bool is not allowed. 3745 if (!isInc) { 3746 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 3747 return QualType(); 3748 } 3749 // Increment of bool sets it to true, but is deprecated. 3750 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 3751 } else if (ResType->isRealType()) { 3752 // OK! 3753 } else if (const PointerType *PT = ResType->getAsPointerType()) { 3754 // C99 6.5.2.4p2, 6.5.6p2 3755 if (PT->getPointeeType()->isVoidType()) { 3756 if (getLangOptions().CPlusPlus) { 3757 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 3758 << Op->getSourceRange(); 3759 return QualType(); 3760 } 3761 3762 // Pointer to void is a GNU extension in C. 3763 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 3764 } else if (PT->getPointeeType()->isFunctionType()) { 3765 if (getLangOptions().CPlusPlus) { 3766 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 3767 << Op->getType() << Op->getSourceRange(); 3768 return QualType(); 3769 } 3770 3771 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 3772 << ResType << Op->getSourceRange(); 3773 } else if (RequireCompleteType(OpLoc, PT->getPointeeType(), 3774 diag::err_typecheck_arithmetic_incomplete_type, 3775 Op->getSourceRange(), SourceRange(), 3776 ResType)) 3777 return QualType(); 3778 } else if (ResType->isComplexType()) { 3779 // C99 does not support ++/-- on complex types, we allow as an extension. 3780 Diag(OpLoc, diag::ext_integer_increment_complex) 3781 << ResType << Op->getSourceRange(); 3782 } else { 3783 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 3784 << ResType << Op->getSourceRange(); 3785 return QualType(); 3786 } 3787 // At this point, we know we have a real, complex or pointer type. 3788 // Now make sure the operand is a modifiable lvalue. 3789 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 3790 return QualType(); 3791 return ResType; 3792} 3793 3794/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 3795/// This routine allows us to typecheck complex/recursive expressions 3796/// where the declaration is needed for type checking. We only need to 3797/// handle cases when the expression references a function designator 3798/// or is an lvalue. Here are some examples: 3799/// - &(x) => x 3800/// - &*****f => f for f a function designator. 3801/// - &s.xx => s 3802/// - &s.zz[1].yy -> s, if zz is an array 3803/// - *(x + 1) -> x, if x is an array 3804/// - &"123"[2] -> 0 3805/// - & __real__ x -> x 3806static NamedDecl *getPrimaryDecl(Expr *E) { 3807 switch (E->getStmtClass()) { 3808 case Stmt::DeclRefExprClass: 3809 case Stmt::QualifiedDeclRefExprClass: 3810 return cast<DeclRefExpr>(E)->getDecl(); 3811 case Stmt::MemberExprClass: 3812 // Fields cannot be declared with a 'register' storage class. 3813 // &X->f is always ok, even if X is declared register. 3814 if (cast<MemberExpr>(E)->isArrow()) 3815 return 0; 3816 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 3817 case Stmt::ArraySubscriptExprClass: { 3818 // &X[4] and &4[X] refers to X if X is not a pointer. 3819 3820 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 3821 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 3822 if (!VD || VD->getType()->isPointerType()) 3823 return 0; 3824 else 3825 return VD; 3826 } 3827 case Stmt::UnaryOperatorClass: { 3828 UnaryOperator *UO = cast<UnaryOperator>(E); 3829 3830 switch(UO->getOpcode()) { 3831 case UnaryOperator::Deref: { 3832 // *(X + 1) refers to X if X is not a pointer. 3833 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 3834 ValueDecl *VD = dyn_cast<ValueDecl>(D); 3835 if (!VD || VD->getType()->isPointerType()) 3836 return 0; 3837 return VD; 3838 } 3839 return 0; 3840 } 3841 case UnaryOperator::Real: 3842 case UnaryOperator::Imag: 3843 case UnaryOperator::Extension: 3844 return getPrimaryDecl(UO->getSubExpr()); 3845 default: 3846 return 0; 3847 } 3848 } 3849 case Stmt::BinaryOperatorClass: { 3850 BinaryOperator *BO = cast<BinaryOperator>(E); 3851 3852 // Handle cases involving pointer arithmetic. The result of an 3853 // Assign or AddAssign is not an lvalue so they can be ignored. 3854 3855 // (x + n) or (n + x) => x 3856 if (BO->getOpcode() == BinaryOperator::Add) { 3857 if (BO->getLHS()->getType()->isPointerType()) { 3858 return getPrimaryDecl(BO->getLHS()); 3859 } else if (BO->getRHS()->getType()->isPointerType()) { 3860 return getPrimaryDecl(BO->getRHS()); 3861 } 3862 } 3863 3864 return 0; 3865 } 3866 case Stmt::ParenExprClass: 3867 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 3868 case Stmt::ImplicitCastExprClass: 3869 // &X[4] when X is an array, has an implicit cast from array to pointer. 3870 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 3871 default: 3872 return 0; 3873 } 3874} 3875 3876/// CheckAddressOfOperand - The operand of & must be either a function 3877/// designator or an lvalue designating an object. If it is an lvalue, the 3878/// object cannot be declared with storage class register or be a bit field. 3879/// Note: The usual conversions are *not* applied to the operand of the & 3880/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 3881/// In C++, the operand might be an overloaded function name, in which case 3882/// we allow the '&' but retain the overloaded-function type. 3883QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 3884 if (op->isTypeDependent()) 3885 return Context.DependentTy; 3886 3887 if (getLangOptions().C99) { 3888 // Implement C99-only parts of addressof rules. 3889 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 3890 if (uOp->getOpcode() == UnaryOperator::Deref) 3891 // Per C99 6.5.3.2, the address of a deref always returns a valid result 3892 // (assuming the deref expression is valid). 3893 return uOp->getSubExpr()->getType(); 3894 } 3895 // Technically, there should be a check for array subscript 3896 // expressions here, but the result of one is always an lvalue anyway. 3897 } 3898 NamedDecl *dcl = getPrimaryDecl(op); 3899 Expr::isLvalueResult lval = op->isLvalue(Context); 3900 3901 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 3902 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 3903 // FIXME: emit more specific diag... 3904 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 3905 << op->getSourceRange(); 3906 return QualType(); 3907 } 3908 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 3909 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemExpr->getMemberDecl())) { 3910 if (Field->isBitField()) { 3911 Diag(OpLoc, diag::err_typecheck_address_of) 3912 << "bit-field" << op->getSourceRange(); 3913 return QualType(); 3914 } 3915 } 3916 // Check for Apple extension for accessing vector components. 3917 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 3918 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 3919 Diag(OpLoc, diag::err_typecheck_address_of) 3920 << "vector element" << op->getSourceRange(); 3921 return QualType(); 3922 } else if (dcl) { // C99 6.5.3.2p1 3923 // We have an lvalue with a decl. Make sure the decl is not declared 3924 // with the register storage-class specifier. 3925 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 3926 if (vd->getStorageClass() == VarDecl::Register) { 3927 Diag(OpLoc, diag::err_typecheck_address_of) 3928 << "register variable" << op->getSourceRange(); 3929 return QualType(); 3930 } 3931 } else if (isa<OverloadedFunctionDecl>(dcl)) { 3932 return Context.OverloadTy; 3933 } else if (isa<FieldDecl>(dcl)) { 3934 // Okay: we can take the address of a field. 3935 // Could be a pointer to member, though, if there is an explicit 3936 // scope qualifier for the class. 3937 if (isa<QualifiedDeclRefExpr>(op)) { 3938 DeclContext *Ctx = dcl->getDeclContext(); 3939 if (Ctx && Ctx->isRecord()) 3940 return Context.getMemberPointerType(op->getType(), 3941 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3942 } 3943 } else if (isa<FunctionDecl>(dcl)) { 3944 // Okay: we can take the address of a function. 3945 // As above. 3946 if (isa<QualifiedDeclRefExpr>(op)) { 3947 DeclContext *Ctx = dcl->getDeclContext(); 3948 if (Ctx && Ctx->isRecord()) 3949 return Context.getMemberPointerType(op->getType(), 3950 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3951 } 3952 } 3953 else 3954 assert(0 && "Unknown/unexpected decl type"); 3955 } 3956 3957 // If the operand has type "type", the result has type "pointer to type". 3958 return Context.getPointerType(op->getType()); 3959} 3960 3961QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 3962 if (Op->isTypeDependent()) 3963 return Context.DependentTy; 3964 3965 UsualUnaryConversions(Op); 3966 QualType Ty = Op->getType(); 3967 3968 // Note that per both C89 and C99, this is always legal, even if ptype is an 3969 // incomplete type or void. It would be possible to warn about dereferencing 3970 // a void pointer, but it's completely well-defined, and such a warning is 3971 // unlikely to catch any mistakes. 3972 if (const PointerType *PT = Ty->getAsPointerType()) 3973 return PT->getPointeeType(); 3974 3975 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 3976 << Ty << Op->getSourceRange(); 3977 return QualType(); 3978} 3979 3980static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 3981 tok::TokenKind Kind) { 3982 BinaryOperator::Opcode Opc; 3983 switch (Kind) { 3984 default: assert(0 && "Unknown binop!"); 3985 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 3986 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 3987 case tok::star: Opc = BinaryOperator::Mul; break; 3988 case tok::slash: Opc = BinaryOperator::Div; break; 3989 case tok::percent: Opc = BinaryOperator::Rem; break; 3990 case tok::plus: Opc = BinaryOperator::Add; break; 3991 case tok::minus: Opc = BinaryOperator::Sub; break; 3992 case tok::lessless: Opc = BinaryOperator::Shl; break; 3993 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 3994 case tok::lessequal: Opc = BinaryOperator::LE; break; 3995 case tok::less: Opc = BinaryOperator::LT; break; 3996 case tok::greaterequal: Opc = BinaryOperator::GE; break; 3997 case tok::greater: Opc = BinaryOperator::GT; break; 3998 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 3999 case tok::equalequal: Opc = BinaryOperator::EQ; break; 4000 case tok::amp: Opc = BinaryOperator::And; break; 4001 case tok::caret: Opc = BinaryOperator::Xor; break; 4002 case tok::pipe: Opc = BinaryOperator::Or; break; 4003 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 4004 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 4005 case tok::equal: Opc = BinaryOperator::Assign; break; 4006 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 4007 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 4008 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 4009 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 4010 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 4011 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 4012 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 4013 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 4014 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 4015 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 4016 case tok::comma: Opc = BinaryOperator::Comma; break; 4017 } 4018 return Opc; 4019} 4020 4021static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 4022 tok::TokenKind Kind) { 4023 UnaryOperator::Opcode Opc; 4024 switch (Kind) { 4025 default: assert(0 && "Unknown unary op!"); 4026 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 4027 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 4028 case tok::amp: Opc = UnaryOperator::AddrOf; break; 4029 case tok::star: Opc = UnaryOperator::Deref; break; 4030 case tok::plus: Opc = UnaryOperator::Plus; break; 4031 case tok::minus: Opc = UnaryOperator::Minus; break; 4032 case tok::tilde: Opc = UnaryOperator::Not; break; 4033 case tok::exclaim: Opc = UnaryOperator::LNot; break; 4034 case tok::kw___real: Opc = UnaryOperator::Real; break; 4035 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 4036 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 4037 } 4038 return Opc; 4039} 4040 4041/// CreateBuiltinBinOp - Creates a new built-in binary operation with 4042/// operator @p Opc at location @c TokLoc. This routine only supports 4043/// built-in operations; ActOnBinOp handles overloaded operators. 4044Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 4045 unsigned Op, 4046 Expr *lhs, Expr *rhs) { 4047 QualType ResultTy; // Result type of the binary operator. 4048 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 4049 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 4050 4051 switch (Opc) { 4052 case BinaryOperator::Assign: 4053 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 4054 break; 4055 case BinaryOperator::PtrMemD: 4056 case BinaryOperator::PtrMemI: 4057 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 4058 Opc == BinaryOperator::PtrMemI); 4059 break; 4060 case BinaryOperator::Mul: 4061 case BinaryOperator::Div: 4062 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 4063 break; 4064 case BinaryOperator::Rem: 4065 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 4066 break; 4067 case BinaryOperator::Add: 4068 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 4069 break; 4070 case BinaryOperator::Sub: 4071 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 4072 break; 4073 case BinaryOperator::Shl: 4074 case BinaryOperator::Shr: 4075 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 4076 break; 4077 case BinaryOperator::LE: 4078 case BinaryOperator::LT: 4079 case BinaryOperator::GE: 4080 case BinaryOperator::GT: 4081 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 4082 break; 4083 case BinaryOperator::EQ: 4084 case BinaryOperator::NE: 4085 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 4086 break; 4087 case BinaryOperator::And: 4088 case BinaryOperator::Xor: 4089 case BinaryOperator::Or: 4090 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 4091 break; 4092 case BinaryOperator::LAnd: 4093 case BinaryOperator::LOr: 4094 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 4095 break; 4096 case BinaryOperator::MulAssign: 4097 case BinaryOperator::DivAssign: 4098 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 4099 if (!CompTy.isNull()) 4100 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4101 break; 4102 case BinaryOperator::RemAssign: 4103 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 4104 if (!CompTy.isNull()) 4105 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4106 break; 4107 case BinaryOperator::AddAssign: 4108 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 4109 if (!CompTy.isNull()) 4110 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4111 break; 4112 case BinaryOperator::SubAssign: 4113 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 4114 if (!CompTy.isNull()) 4115 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4116 break; 4117 case BinaryOperator::ShlAssign: 4118 case BinaryOperator::ShrAssign: 4119 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 4120 if (!CompTy.isNull()) 4121 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4122 break; 4123 case BinaryOperator::AndAssign: 4124 case BinaryOperator::XorAssign: 4125 case BinaryOperator::OrAssign: 4126 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 4127 if (!CompTy.isNull()) 4128 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 4129 break; 4130 case BinaryOperator::Comma: 4131 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 4132 break; 4133 } 4134 if (ResultTy.isNull()) 4135 return ExprError(); 4136 if (CompTy.isNull()) 4137 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 4138 else 4139 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 4140 CompTy, OpLoc)); 4141} 4142 4143// Binary Operators. 'Tok' is the token for the operator. 4144Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 4145 tok::TokenKind Kind, 4146 ExprArg LHS, ExprArg RHS) { 4147 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 4148 Expr *lhs = (Expr *)LHS.release(), *rhs = (Expr*)RHS.release(); 4149 4150 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 4151 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 4152 4153 if (getLangOptions().CPlusPlus && 4154 (lhs->getType()->isOverloadableType() || 4155 rhs->getType()->isOverloadableType())) { 4156 // Find all of the overloaded operators visible from this 4157 // point. We perform both an operator-name lookup from the local 4158 // scope and an argument-dependent lookup based on the types of 4159 // the arguments. 4160 FunctionSet Functions; 4161 OverloadedOperatorKind OverOp = BinaryOperator::getOverloadedOperator(Opc); 4162 if (OverOp != OO_None) { 4163 LookupOverloadedOperatorName(OverOp, S, lhs->getType(), rhs->getType(), 4164 Functions); 4165 Expr *Args[2] = { lhs, rhs }; 4166 DeclarationName OpName 4167 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4168 ArgumentDependentLookup(OpName, Args, 2, Functions); 4169 } 4170 4171 // Build the (potentially-overloaded, potentially-dependent) 4172 // binary operation. 4173 return CreateOverloadedBinOp(TokLoc, Opc, Functions, lhs, rhs); 4174 } 4175 4176 // Build a built-in binary operation. 4177 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4178} 4179 4180Action::OwningExprResult Sema::CreateBuiltinUnaryOp(SourceLocation OpLoc, 4181 unsigned OpcIn, 4182 ExprArg InputArg) { 4183 UnaryOperator::Opcode Opc = static_cast<UnaryOperator::Opcode>(OpcIn); 4184 4185 // FIXME: Input is modified below, but InputArg is not updated 4186 // appropriately. 4187 Expr *Input = (Expr *)InputArg.get(); 4188 QualType resultType; 4189 switch (Opc) { 4190 case UnaryOperator::PostInc: 4191 case UnaryOperator::PostDec: 4192 case UnaryOperator::OffsetOf: 4193 assert(false && "Invalid unary operator"); 4194 break; 4195 4196 case UnaryOperator::PreInc: 4197 case UnaryOperator::PreDec: 4198 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4199 Opc == UnaryOperator::PreInc); 4200 break; 4201 case UnaryOperator::AddrOf: 4202 resultType = CheckAddressOfOperand(Input, OpLoc); 4203 break; 4204 case UnaryOperator::Deref: 4205 DefaultFunctionArrayConversion(Input); 4206 resultType = CheckIndirectionOperand(Input, OpLoc); 4207 break; 4208 case UnaryOperator::Plus: 4209 case UnaryOperator::Minus: 4210 UsualUnaryConversions(Input); 4211 resultType = Input->getType(); 4212 if (resultType->isDependentType()) 4213 break; 4214 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4215 break; 4216 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4217 resultType->isEnumeralType()) 4218 break; 4219 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4220 Opc == UnaryOperator::Plus && 4221 resultType->isPointerType()) 4222 break; 4223 4224 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4225 << resultType << Input->getSourceRange()); 4226 case UnaryOperator::Not: // bitwise complement 4227 UsualUnaryConversions(Input); 4228 resultType = Input->getType(); 4229 if (resultType->isDependentType()) 4230 break; 4231 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4232 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4233 // C99 does not support '~' for complex conjugation. 4234 Diag(OpLoc, diag::ext_integer_complement_complex) 4235 << resultType << Input->getSourceRange(); 4236 else if (!resultType->isIntegerType()) 4237 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4238 << resultType << Input->getSourceRange()); 4239 break; 4240 case UnaryOperator::LNot: // logical negation 4241 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4242 DefaultFunctionArrayConversion(Input); 4243 resultType = Input->getType(); 4244 if (resultType->isDependentType()) 4245 break; 4246 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4247 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4248 << resultType << Input->getSourceRange()); 4249 // LNot always has type int. C99 6.5.3.3p5. 4250 // In C++, it's bool. C++ 5.3.1p8 4251 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4252 break; 4253 case UnaryOperator::Real: 4254 case UnaryOperator::Imag: 4255 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4256 break; 4257 case UnaryOperator::Extension: 4258 resultType = Input->getType(); 4259 break; 4260 } 4261 if (resultType.isNull()) 4262 return ExprError(); 4263 4264 InputArg.release(); 4265 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4266} 4267 4268// Unary Operators. 'Tok' is the token for the operator. 4269Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4270 tok::TokenKind Op, ExprArg input) { 4271 Expr *Input = (Expr*)input.get(); 4272 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4273 4274 if (getLangOptions().CPlusPlus && Input->getType()->isOverloadableType()) { 4275 // Find all of the overloaded operators visible from this 4276 // point. We perform both an operator-name lookup from the local 4277 // scope and an argument-dependent lookup based on the types of 4278 // the arguments. 4279 FunctionSet Functions; 4280 OverloadedOperatorKind OverOp = UnaryOperator::getOverloadedOperator(Opc); 4281 if (OverOp != OO_None) { 4282 LookupOverloadedOperatorName(OverOp, S, Input->getType(), QualType(), 4283 Functions); 4284 DeclarationName OpName 4285 = Context.DeclarationNames.getCXXOperatorName(OverOp); 4286 ArgumentDependentLookup(OpName, &Input, 1, Functions); 4287 } 4288 4289 return CreateOverloadedUnaryOp(OpLoc, Opc, Functions, move(input)); 4290 } 4291 4292 return CreateBuiltinUnaryOp(OpLoc, Opc, move(input)); 4293} 4294 4295/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4296Sema::OwningExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4297 SourceLocation LabLoc, 4298 IdentifierInfo *LabelII) { 4299 // Look up the record for this label identifier. 4300 LabelStmt *&LabelDecl = CurBlock ? CurBlock->LabelMap[LabelII] : 4301 LabelMap[LabelII]; 4302 4303 // If we haven't seen this label yet, create a forward reference. It 4304 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4305 if (LabelDecl == 0) 4306 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4307 4308 // Create the AST node. The address of a label always has type 'void*'. 4309 return Owned(new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4310 Context.getPointerType(Context.VoidTy))); 4311} 4312 4313Sema::OwningExprResult 4314Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtArg substmt, 4315 SourceLocation RPLoc) { // "({..})" 4316 Stmt *SubStmt = static_cast<Stmt*>(substmt.get()); 4317 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4318 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4319 4320 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4321 if (isFileScope) { 4322 return ExprError(Diag(LPLoc, diag::err_stmtexpr_file_scope)); 4323 } 4324 4325 // FIXME: there are a variety of strange constraints to enforce here, for 4326 // example, it is not possible to goto into a stmt expression apparently. 4327 // More semantic analysis is needed. 4328 4329 // FIXME: the last statement in the compount stmt has its value used. We 4330 // should not warn about it being unused. 4331 4332 // If there are sub stmts in the compound stmt, take the type of the last one 4333 // as the type of the stmtexpr. 4334 QualType Ty = Context.VoidTy; 4335 4336 if (!Compound->body_empty()) { 4337 Stmt *LastStmt = Compound->body_back(); 4338 // If LastStmt is a label, skip down through into the body. 4339 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4340 LastStmt = Label->getSubStmt(); 4341 4342 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4343 Ty = LastExpr->getType(); 4344 } 4345 4346 // FIXME: Check that expression type is complete/non-abstract; statement 4347 // expressions are not lvalues. 4348 4349 substmt.release(); 4350 return Owned(new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc)); 4351} 4352 4353Sema::OwningExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4354 SourceLocation BuiltinLoc, 4355 SourceLocation TypeLoc, 4356 TypeTy *argty, 4357 OffsetOfComponent *CompPtr, 4358 unsigned NumComponents, 4359 SourceLocation RPLoc) { 4360 // FIXME: This function leaks all expressions in the offset components on 4361 // error. 4362 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4363 assert(!ArgTy.isNull() && "Missing type argument!"); 4364 4365 bool Dependent = ArgTy->isDependentType(); 4366 4367 // We must have at least one component that refers to the type, and the first 4368 // one is known to be a field designator. Verify that the ArgTy represents 4369 // a struct/union/class. 4370 if (!Dependent && !ArgTy->isRecordType()) 4371 return ExprError(Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy); 4372 4373 // FIXME: Type must be complete per C99 7.17p3 because a declaring a variable 4374 // with an incomplete type would be illegal. 4375 4376 // Otherwise, create a null pointer as the base, and iteratively process 4377 // the offsetof designators. 4378 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4379 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4380 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4381 ArgTy, SourceLocation()); 4382 4383 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4384 // GCC extension, diagnose them. 4385 // FIXME: This diagnostic isn't actually visible because the location is in 4386 // a system header! 4387 if (NumComponents != 1) 4388 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4389 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4390 4391 if (!Dependent) { 4392 // FIXME: Dependent case loses a lot of information here. And probably 4393 // leaks like a sieve. 4394 for (unsigned i = 0; i != NumComponents; ++i) { 4395 const OffsetOfComponent &OC = CompPtr[i]; 4396 if (OC.isBrackets) { 4397 // Offset of an array sub-field. TODO: Should we allow vector elements? 4398 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4399 if (!AT) { 4400 Res->Destroy(Context); 4401 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_array_type) 4402 << Res->getType()); 4403 } 4404 4405 // FIXME: C++: Verify that operator[] isn't overloaded. 4406 4407 // Promote the array so it looks more like a normal array subscript 4408 // expression. 4409 DefaultFunctionArrayConversion(Res); 4410 4411 // C99 6.5.2.1p1 4412 Expr *Idx = static_cast<Expr*>(OC.U.E); 4413 // FIXME: Leaks Res 4414 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4415 return ExprError(Diag(Idx->getLocStart(), 4416 diag::err_typecheck_subscript) 4417 << Idx->getSourceRange()); 4418 4419 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4420 OC.LocEnd); 4421 continue; 4422 } 4423 4424 const RecordType *RC = Res->getType()->getAsRecordType(); 4425 if (!RC) { 4426 Res->Destroy(Context); 4427 return ExprError(Diag(OC.LocEnd, diag::err_offsetof_record_type) 4428 << Res->getType()); 4429 } 4430 4431 // Get the decl corresponding to this. 4432 RecordDecl *RD = RC->getDecl(); 4433 FieldDecl *MemberDecl 4434 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4435 LookupMemberName) 4436 .getAsDecl()); 4437 // FIXME: Leaks Res 4438 if (!MemberDecl) 4439 return ExprError(Diag(BuiltinLoc, diag::err_typecheck_no_member) 4440 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd)); 4441 4442 // FIXME: C++: Verify that MemberDecl isn't a static field. 4443 // FIXME: Verify that MemberDecl isn't a bitfield. 4444 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 4445 // matter here. 4446 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4447 MemberDecl->getType().getNonReferenceType()); 4448 } 4449 } 4450 4451 return Owned(new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4452 Context.getSizeType(), BuiltinLoc)); 4453} 4454 4455 4456Sema::OwningExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4457 TypeTy *arg1,TypeTy *arg2, 4458 SourceLocation RPLoc) { 4459 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4460 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4461 4462 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4463 4464 return Owned(new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, 4465 argT1, argT2, RPLoc)); 4466} 4467 4468Sema::OwningExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, 4469 ExprArg cond, 4470 ExprArg expr1, ExprArg expr2, 4471 SourceLocation RPLoc) { 4472 Expr *CondExpr = static_cast<Expr*>(cond.get()); 4473 Expr *LHSExpr = static_cast<Expr*>(expr1.get()); 4474 Expr *RHSExpr = static_cast<Expr*>(expr2.get()); 4475 4476 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4477 4478 QualType resType; 4479 if (CondExpr->isValueDependent()) { 4480 resType = Context.DependentTy; 4481 } else { 4482 // The conditional expression is required to be a constant expression. 4483 llvm::APSInt condEval(32); 4484 SourceLocation ExpLoc; 4485 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4486 return ExprError(Diag(ExpLoc, 4487 diag::err_typecheck_choose_expr_requires_constant) 4488 << CondExpr->getSourceRange()); 4489 4490 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4491 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 4492 } 4493 4494 cond.release(); expr1.release(); expr2.release(); 4495 return Owned(new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4496 resType, RPLoc)); 4497} 4498 4499//===----------------------------------------------------------------------===// 4500// Clang Extensions. 4501//===----------------------------------------------------------------------===// 4502 4503/// ActOnBlockStart - This callback is invoked when a block literal is started. 4504void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4505 // Analyze block parameters. 4506 BlockSemaInfo *BSI = new BlockSemaInfo(); 4507 4508 // Add BSI to CurBlock. 4509 BSI->PrevBlockInfo = CurBlock; 4510 CurBlock = BSI; 4511 4512 BSI->ReturnType = 0; 4513 BSI->TheScope = BlockScope; 4514 BSI->hasBlockDeclRefExprs = false; 4515 4516 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4517 PushDeclContext(BlockScope, BSI->TheDecl); 4518} 4519 4520void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4521 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4522 4523 if (ParamInfo.getNumTypeObjects() == 0 4524 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4525 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4526 4527 // The type is entirely optional as well, if none, use DependentTy. 4528 if (T.isNull()) 4529 T = Context.DependentTy; 4530 4531 // The parameter list is optional, if there was none, assume (). 4532 if (!T->isFunctionType()) 4533 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4534 4535 CurBlock->hasPrototype = true; 4536 CurBlock->isVariadic = false; 4537 Type *RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4538 .getTypePtr(); 4539 4540 if (!RetTy->isDependentType()) 4541 CurBlock->ReturnType = RetTy; 4542 return; 4543 } 4544 4545 // Analyze arguments to block. 4546 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4547 "Not a function declarator!"); 4548 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4549 4550 CurBlock->hasPrototype = FTI.hasPrototype; 4551 CurBlock->isVariadic = true; 4552 4553 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4554 // no arguments, not a function that takes a single void argument. 4555 if (FTI.hasPrototype && 4556 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4557 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 4558 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 4559 // empty arg list, don't push any params. 4560 CurBlock->isVariadic = false; 4561 } else if (FTI.hasPrototype) { 4562 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4563 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 4564 CurBlock->isVariadic = FTI.isVariadic; 4565 QualType T = GetTypeForDeclarator (ParamInfo, CurScope); 4566 4567 Type* RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4568 .getTypePtr(); 4569 4570 if (!RetTy->isDependentType()) 4571 CurBlock->ReturnType = RetTy; 4572 } 4573 CurBlock->TheDecl->setParams(Context, &CurBlock->Params[0], 4574 CurBlock->Params.size()); 4575 4576 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4577 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4578 // If this has an identifier, add it to the scope stack. 4579 if ((*AI)->getIdentifier()) 4580 PushOnScopeChains(*AI, CurBlock->TheScope); 4581} 4582 4583/// ActOnBlockError - If there is an error parsing a block, this callback 4584/// is invoked to pop the information about the block from the action impl. 4585void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4586 // Ensure that CurBlock is deleted. 4587 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4588 4589 // Pop off CurBlock, handle nested blocks. 4590 CurBlock = CurBlock->PrevBlockInfo; 4591 4592 // FIXME: Delete the ParmVarDecl objects as well??? 4593 4594} 4595 4596/// ActOnBlockStmtExpr - This is called when the body of a block statement 4597/// literal was successfully completed. ^(int x){...} 4598Sema::OwningExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, 4599 StmtArg body, Scope *CurScope) { 4600 // Ensure that CurBlock is deleted. 4601 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4602 4603 PopDeclContext(); 4604 4605 // Pop off CurBlock, handle nested blocks. 4606 CurBlock = CurBlock->PrevBlockInfo; 4607 4608 QualType RetTy = Context.VoidTy; 4609 if (BSI->ReturnType) 4610 RetTy = QualType(BSI->ReturnType, 0); 4611 4612 llvm::SmallVector<QualType, 8> ArgTypes; 4613 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4614 ArgTypes.push_back(BSI->Params[i]->getType()); 4615 4616 QualType BlockTy; 4617 if (!BSI->hasPrototype) 4618 BlockTy = Context.getFunctionNoProtoType(RetTy); 4619 else 4620 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 4621 BSI->isVariadic, 0); 4622 4623 // FIXME: Check that return/parameter types are complete/non-abstract 4624 4625 BlockTy = Context.getBlockPointerType(BlockTy); 4626 4627 BSI->TheDecl->setBody(static_cast<CompoundStmt*>(body.release())); 4628 return Owned(new (Context) BlockExpr(BSI->TheDecl, BlockTy, 4629 BSI->hasBlockDeclRefExprs)); 4630} 4631 4632Sema::OwningExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 4633 ExprArg expr, TypeTy *type, 4634 SourceLocation RPLoc) { 4635 QualType T = QualType::getFromOpaquePtr(type); 4636 4637 InitBuiltinVaListType(); 4638 4639 // Get the va_list type 4640 QualType VaListType = Context.getBuiltinVaListType(); 4641 // Deal with implicit array decay; for example, on x86-64, 4642 // va_list is an array, but it's supposed to decay to 4643 // a pointer for va_arg. 4644 if (VaListType->isArrayType()) 4645 VaListType = Context.getArrayDecayedType(VaListType); 4646 // Make sure the input expression also decays appropriately. 4647 Expr *E = static_cast<Expr*>(expr.get()); 4648 UsualUnaryConversions(E); 4649 4650 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 4651 return ExprError(Diag(E->getLocStart(), 4652 diag::err_first_argument_to_va_arg_not_of_type_va_list) 4653 << E->getType() << E->getSourceRange()); 4654 4655 // FIXME: Check that type is complete/non-abstract 4656 // FIXME: Warn if a non-POD type is passed in. 4657 4658 expr.release(); 4659 return Owned(new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), 4660 RPLoc)); 4661} 4662 4663Sema::OwningExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 4664 // The type of __null will be int or long, depending on the size of 4665 // pointers on the target. 4666 QualType Ty; 4667 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 4668 Ty = Context.IntTy; 4669 else 4670 Ty = Context.LongTy; 4671 4672 return Owned(new (Context) GNUNullExpr(Ty, TokenLoc)); 4673} 4674 4675bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 4676 SourceLocation Loc, 4677 QualType DstType, QualType SrcType, 4678 Expr *SrcExpr, const char *Flavor) { 4679 // Decode the result (notice that AST's are still created for extensions). 4680 bool isInvalid = false; 4681 unsigned DiagKind; 4682 switch (ConvTy) { 4683 default: assert(0 && "Unknown conversion type"); 4684 case Compatible: return false; 4685 case PointerToInt: 4686 DiagKind = diag::ext_typecheck_convert_pointer_int; 4687 break; 4688 case IntToPointer: 4689 DiagKind = diag::ext_typecheck_convert_int_pointer; 4690 break; 4691 case IncompatiblePointer: 4692 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 4693 break; 4694 case IncompatiblePointerSign: 4695 DiagKind = diag::ext_typecheck_convert_incompatible_pointer_sign; 4696 break; 4697 case FunctionVoidPointer: 4698 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 4699 break; 4700 case CompatiblePointerDiscardsQualifiers: 4701 // If the qualifiers lost were because we were applying the 4702 // (deprecated) C++ conversion from a string literal to a char* 4703 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 4704 // Ideally, this check would be performed in 4705 // CheckPointerTypesForAssignment. However, that would require a 4706 // bit of refactoring (so that the second argument is an 4707 // expression, rather than a type), which should be done as part 4708 // of a larger effort to fix CheckPointerTypesForAssignment for 4709 // C++ semantics. 4710 if (getLangOptions().CPlusPlus && 4711 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 4712 return false; 4713 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 4714 break; 4715 case IntToBlockPointer: 4716 DiagKind = diag::err_int_to_block_pointer; 4717 break; 4718 case IncompatibleBlockPointer: 4719 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 4720 break; 4721 case IncompatibleObjCQualifiedId: 4722 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 4723 // it can give a more specific diagnostic. 4724 DiagKind = diag::warn_incompatible_qualified_id; 4725 break; 4726 case IncompatibleVectors: 4727 DiagKind = diag::warn_incompatible_vectors; 4728 break; 4729 case Incompatible: 4730 DiagKind = diag::err_typecheck_convert_incompatible; 4731 isInvalid = true; 4732 break; 4733 } 4734 4735 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 4736 << SrcExpr->getSourceRange(); 4737 return isInvalid; 4738} 4739 4740bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 4741{ 4742 Expr::EvalResult EvalResult; 4743 4744 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 4745 EvalResult.HasSideEffects) { 4746 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 4747 4748 if (EvalResult.Diag) { 4749 // We only show the note if it's not the usual "invalid subexpression" 4750 // or if it's actually in a subexpression. 4751 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 4752 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 4753 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4754 } 4755 4756 return true; 4757 } 4758 4759 if (EvalResult.Diag) { 4760 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 4761 E->getSourceRange(); 4762 4763 // Print the reason it's not a constant. 4764 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4765 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4766 } 4767 4768 if (Result) 4769 *Result = EvalResult.Val.getInt(); 4770 return false; 4771} 4772