SemaExpr.cpp revision dd71e75bc6811906b458ee93b18a350fa758b00e
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/LiteralSupport.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29/// \brief Determine whether the use of this declaration is valid, and 30/// emit any corresponding diagnostics. 31/// 32/// This routine diagnoses various problems with referencing 33/// declarations that can occur when using a declaration. For example, 34/// it might warn if a deprecated or unavailable declaration is being 35/// used, or produce an error (and return true) if a C++0x deleted 36/// function is being used. 37/// 38/// \returns true if there was an error (this declaration cannot be 39/// referenced), false otherwise. 40bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc) { 41 // See if the decl is deprecated. 42 if (D->getAttr<DeprecatedAttr>()) { 43 // Implementing deprecated stuff requires referencing deprecated 44 // stuff. Don't warn if we are implementing a deprecated 45 // construct. 46 bool isSilenced = false; 47 48 if (NamedDecl *ND = getCurFunctionOrMethodDecl()) { 49 // If this reference happens *in* a deprecated function or method, don't 50 // warn. 51 isSilenced = ND->getAttr<DeprecatedAttr>(); 52 53 // If this is an Objective-C method implementation, check to see if the 54 // method was deprecated on the declaration, not the definition. 55 if (ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(ND)) { 56 // The semantic decl context of a ObjCMethodDecl is the 57 // ObjCImplementationDecl. 58 if (ObjCImplementationDecl *Impl 59 = dyn_cast<ObjCImplementationDecl>(MD->getParent())) { 60 61 MD = Impl->getClassInterface()->getMethod(MD->getSelector(), 62 MD->isInstanceMethod()); 63 isSilenced |= MD && MD->getAttr<DeprecatedAttr>(); 64 } 65 } 66 } 67 68 if (!isSilenced) 69 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 70 } 71 72 // See if this is a deleted function. 73 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 74 if (FD->isDeleted()) { 75 Diag(Loc, diag::err_deleted_function_use); 76 Diag(D->getLocation(), diag::note_unavailable_here) << true; 77 return true; 78 } 79 } 80 81 // See if the decl is unavailable 82 if (D->getAttr<UnavailableAttr>()) { 83 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 84 Diag(D->getLocation(), diag::note_unavailable_here) << 0; 85 } 86 87 return false; 88} 89 90SourceRange Sema::getExprRange(ExprTy *E) const { 91 Expr *Ex = (Expr *)E; 92 return Ex? Ex->getSourceRange() : SourceRange(); 93} 94 95//===----------------------------------------------------------------------===// 96// Standard Promotions and Conversions 97//===----------------------------------------------------------------------===// 98 99/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 100void Sema::DefaultFunctionArrayConversion(Expr *&E) { 101 QualType Ty = E->getType(); 102 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 103 104 if (Ty->isFunctionType()) 105 ImpCastExprToType(E, Context.getPointerType(Ty)); 106 else if (Ty->isArrayType()) { 107 // In C90 mode, arrays only promote to pointers if the array expression is 108 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 109 // type 'array of type' is converted to an expression that has type 'pointer 110 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 111 // that has type 'array of type' ...". The relevant change is "an lvalue" 112 // (C90) to "an expression" (C99). 113 // 114 // C++ 4.2p1: 115 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 116 // T" can be converted to an rvalue of type "pointer to T". 117 // 118 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 119 E->isLvalue(Context) == Expr::LV_Valid) 120 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 121 } 122} 123 124/// UsualUnaryConversions - Performs various conversions that are common to most 125/// operators (C99 6.3). The conversions of array and function types are 126/// sometimes surpressed. For example, the array->pointer conversion doesn't 127/// apply if the array is an argument to the sizeof or address (&) operators. 128/// In these instances, this routine should *not* be called. 129Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 130 QualType Ty = Expr->getType(); 131 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 132 133 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 134 ImpCastExprToType(Expr, Context.IntTy); 135 else 136 DefaultFunctionArrayConversion(Expr); 137 138 return Expr; 139} 140 141/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 142/// do not have a prototype. Arguments that have type float are promoted to 143/// double. All other argument types are converted by UsualUnaryConversions(). 144void Sema::DefaultArgumentPromotion(Expr *&Expr) { 145 QualType Ty = Expr->getType(); 146 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 147 148 // If this is a 'float' (CVR qualified or typedef) promote to double. 149 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 150 if (BT->getKind() == BuiltinType::Float) 151 return ImpCastExprToType(Expr, Context.DoubleTy); 152 153 UsualUnaryConversions(Expr); 154} 155 156// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 157// will warn if the resulting type is not a POD type. 158void Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 159 DefaultArgumentPromotion(Expr); 160 161 if (!Expr->getType()->isPODType()) { 162 Diag(Expr->getLocStart(), 163 diag::warn_cannot_pass_non_pod_arg_to_vararg) << 164 Expr->getType() << CT; 165 } 166} 167 168 169/// UsualArithmeticConversions - Performs various conversions that are common to 170/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 171/// routine returns the first non-arithmetic type found. The client is 172/// responsible for emitting appropriate error diagnostics. 173/// FIXME: verify the conversion rules for "complex int" are consistent with 174/// GCC. 175QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 176 bool isCompAssign) { 177 if (!isCompAssign) { 178 UsualUnaryConversions(lhsExpr); 179 UsualUnaryConversions(rhsExpr); 180 } 181 182 // For conversion purposes, we ignore any qualifiers. 183 // For example, "const float" and "float" are equivalent. 184 QualType lhs = 185 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 186 QualType rhs = 187 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 188 189 // If both types are identical, no conversion is needed. 190 if (lhs == rhs) 191 return lhs; 192 193 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 194 // The caller can deal with this (e.g. pointer + int). 195 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 196 return lhs; 197 198 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 199 if (!isCompAssign) { 200 ImpCastExprToType(lhsExpr, destType); 201 ImpCastExprToType(rhsExpr, destType); 202 } 203 return destType; 204} 205 206QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 207 // Perform the usual unary conversions. We do this early so that 208 // integral promotions to "int" can allow us to exit early, in the 209 // lhs == rhs check. Also, for conversion purposes, we ignore any 210 // qualifiers. For example, "const float" and "float" are 211 // equivalent. 212 if (lhs->isPromotableIntegerType()) 213 lhs = Context.IntTy; 214 else 215 lhs = lhs.getUnqualifiedType(); 216 if (rhs->isPromotableIntegerType()) 217 rhs = Context.IntTy; 218 else 219 rhs = rhs.getUnqualifiedType(); 220 221 // If both types are identical, no conversion is needed. 222 if (lhs == rhs) 223 return lhs; 224 225 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 226 // The caller can deal with this (e.g. pointer + int). 227 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 228 return lhs; 229 230 // At this point, we have two different arithmetic types. 231 232 // Handle complex types first (C99 6.3.1.8p1). 233 if (lhs->isComplexType() || rhs->isComplexType()) { 234 // if we have an integer operand, the result is the complex type. 235 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 236 // convert the rhs to the lhs complex type. 237 return lhs; 238 } 239 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 240 // convert the lhs to the rhs complex type. 241 return rhs; 242 } 243 // This handles complex/complex, complex/float, or float/complex. 244 // When both operands are complex, the shorter operand is converted to the 245 // type of the longer, and that is the type of the result. This corresponds 246 // to what is done when combining two real floating-point operands. 247 // The fun begins when size promotion occur across type domains. 248 // From H&S 6.3.4: When one operand is complex and the other is a real 249 // floating-point type, the less precise type is converted, within it's 250 // real or complex domain, to the precision of the other type. For example, 251 // when combining a "long double" with a "double _Complex", the 252 // "double _Complex" is promoted to "long double _Complex". 253 int result = Context.getFloatingTypeOrder(lhs, rhs); 254 255 if (result > 0) { // The left side is bigger, convert rhs. 256 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 257 } else if (result < 0) { // The right side is bigger, convert lhs. 258 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 259 } 260 // At this point, lhs and rhs have the same rank/size. Now, make sure the 261 // domains match. This is a requirement for our implementation, C99 262 // does not require this promotion. 263 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 264 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 265 return rhs; 266 } else { // handle "_Complex double, double". 267 return lhs; 268 } 269 } 270 return lhs; // The domain/size match exactly. 271 } 272 // Now handle "real" floating types (i.e. float, double, long double). 273 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 274 // if we have an integer operand, the result is the real floating type. 275 if (rhs->isIntegerType()) { 276 // convert rhs to the lhs floating point type. 277 return lhs; 278 } 279 if (rhs->isComplexIntegerType()) { 280 // convert rhs to the complex floating point type. 281 return Context.getComplexType(lhs); 282 } 283 if (lhs->isIntegerType()) { 284 // convert lhs to the rhs floating point type. 285 return rhs; 286 } 287 if (lhs->isComplexIntegerType()) { 288 // convert lhs to the complex floating point type. 289 return Context.getComplexType(rhs); 290 } 291 // We have two real floating types, float/complex combos were handled above. 292 // Convert the smaller operand to the bigger result. 293 int result = Context.getFloatingTypeOrder(lhs, rhs); 294 if (result > 0) // convert the rhs 295 return lhs; 296 assert(result < 0 && "illegal float comparison"); 297 return rhs; // convert the lhs 298 } 299 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 300 // Handle GCC complex int extension. 301 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 302 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 303 304 if (lhsComplexInt && rhsComplexInt) { 305 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 306 rhsComplexInt->getElementType()) >= 0) 307 return lhs; // convert the rhs 308 return rhs; 309 } else if (lhsComplexInt && rhs->isIntegerType()) { 310 // convert the rhs to the lhs complex type. 311 return lhs; 312 } else if (rhsComplexInt && lhs->isIntegerType()) { 313 // convert the lhs to the rhs complex type. 314 return rhs; 315 } 316 } 317 // Finally, we have two differing integer types. 318 // The rules for this case are in C99 6.3.1.8 319 int compare = Context.getIntegerTypeOrder(lhs, rhs); 320 bool lhsSigned = lhs->isSignedIntegerType(), 321 rhsSigned = rhs->isSignedIntegerType(); 322 QualType destType; 323 if (lhsSigned == rhsSigned) { 324 // Same signedness; use the higher-ranked type 325 destType = compare >= 0 ? lhs : rhs; 326 } else if (compare != (lhsSigned ? 1 : -1)) { 327 // The unsigned type has greater than or equal rank to the 328 // signed type, so use the unsigned type 329 destType = lhsSigned ? rhs : lhs; 330 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 331 // The two types are different widths; if we are here, that 332 // means the signed type is larger than the unsigned type, so 333 // use the signed type. 334 destType = lhsSigned ? lhs : rhs; 335 } else { 336 // The signed type is higher-ranked than the unsigned type, 337 // but isn't actually any bigger (like unsigned int and long 338 // on most 32-bit systems). Use the unsigned type corresponding 339 // to the signed type. 340 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 341 } 342 return destType; 343} 344 345//===----------------------------------------------------------------------===// 346// Semantic Analysis for various Expression Types 347//===----------------------------------------------------------------------===// 348 349 350/// ActOnStringLiteral - The specified tokens were lexed as pasted string 351/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 352/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 353/// multiple tokens. However, the common case is that StringToks points to one 354/// string. 355/// 356Action::OwningExprResult 357Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 358 assert(NumStringToks && "Must have at least one string!"); 359 360 StringLiteralParser Literal(StringToks, NumStringToks, PP); 361 if (Literal.hadError) 362 return ExprError(); 363 364 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 365 for (unsigned i = 0; i != NumStringToks; ++i) 366 StringTokLocs.push_back(StringToks[i].getLocation()); 367 368 QualType StrTy = Context.CharTy; 369 if (Literal.AnyWide) StrTy = Context.getWCharType(); 370 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 371 372 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 373 if (getLangOptions().CPlusPlus) 374 StrTy.addConst(); 375 376 // Get an array type for the string, according to C99 6.4.5. This includes 377 // the nul terminator character as well as the string length for pascal 378 // strings. 379 StrTy = Context.getConstantArrayType(StrTy, 380 llvm::APInt(32, Literal.GetNumStringChars()+1), 381 ArrayType::Normal, 0); 382 383 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 384 return Owned(StringLiteral::Create(Context, Literal.GetString(), 385 Literal.GetStringLength(), 386 Literal.AnyWide, StrTy, 387 &StringTokLocs[0], 388 StringTokLocs.size())); 389} 390 391/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 392/// CurBlock to VD should cause it to be snapshotted (as we do for auto 393/// variables defined outside the block) or false if this is not needed (e.g. 394/// for values inside the block or for globals). 395/// 396/// FIXME: This will create BlockDeclRefExprs for global variables, 397/// function references, etc which is suboptimal :) and breaks 398/// things like "integer constant expression" tests. 399static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 400 ValueDecl *VD) { 401 // If the value is defined inside the block, we couldn't snapshot it even if 402 // we wanted to. 403 if (CurBlock->TheDecl == VD->getDeclContext()) 404 return false; 405 406 // If this is an enum constant or function, it is constant, don't snapshot. 407 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 408 return false; 409 410 // If this is a reference to an extern, static, or global variable, no need to 411 // snapshot it. 412 // FIXME: What about 'const' variables in C++? 413 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 414 return Var->hasLocalStorage(); 415 416 return true; 417} 418 419 420 421/// ActOnIdentifierExpr - The parser read an identifier in expression context, 422/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 423/// identifier is used in a function call context. 424/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 425/// class or namespace that the identifier must be a member of. 426Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 427 IdentifierInfo &II, 428 bool HasTrailingLParen, 429 const CXXScopeSpec *SS, 430 bool isAddressOfOperand) { 431 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 432 isAddressOfOperand); 433} 434 435/// BuildDeclRefExpr - Build either a DeclRefExpr or a 436/// QualifiedDeclRefExpr based on whether or not SS is a 437/// nested-name-specifier. 438DeclRefExpr * 439Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 440 bool TypeDependent, bool ValueDependent, 441 const CXXScopeSpec *SS) { 442 if (SS && !SS->isEmpty()) 443 return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 444 ValueDependent, 445 SS->getRange().getBegin()); 446 else 447 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 448} 449 450/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 451/// variable corresponding to the anonymous union or struct whose type 452/// is Record. 453static Decl *getObjectForAnonymousRecordDecl(RecordDecl *Record) { 454 assert(Record->isAnonymousStructOrUnion() && 455 "Record must be an anonymous struct or union!"); 456 457 // FIXME: Once Decls are directly linked together, this will 458 // be an O(1) operation rather than a slow walk through DeclContext's 459 // vector (which itself will be eliminated). DeclGroups might make 460 // this even better. 461 DeclContext *Ctx = Record->getDeclContext(); 462 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 463 DEnd = Ctx->decls_end(); 464 D != DEnd; ++D) { 465 if (*D == Record) { 466 // The object for the anonymous struct/union directly 467 // follows its type in the list of declarations. 468 ++D; 469 assert(D != DEnd && "Missing object for anonymous record"); 470 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 471 return *D; 472 } 473 } 474 475 assert(false && "Missing object for anonymous record"); 476 return 0; 477} 478 479Sema::OwningExprResult 480Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 481 FieldDecl *Field, 482 Expr *BaseObjectExpr, 483 SourceLocation OpLoc) { 484 assert(Field->getDeclContext()->isRecord() && 485 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 486 && "Field must be stored inside an anonymous struct or union"); 487 488 // Construct the sequence of field member references 489 // we'll have to perform to get to the field in the anonymous 490 // union/struct. The list of members is built from the field 491 // outward, so traverse it backwards to go from an object in 492 // the current context to the field we found. 493 llvm::SmallVector<FieldDecl *, 4> AnonFields; 494 AnonFields.push_back(Field); 495 VarDecl *BaseObject = 0; 496 DeclContext *Ctx = Field->getDeclContext(); 497 do { 498 RecordDecl *Record = cast<RecordDecl>(Ctx); 499 Decl *AnonObject = getObjectForAnonymousRecordDecl(Record); 500 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 501 AnonFields.push_back(AnonField); 502 else { 503 BaseObject = cast<VarDecl>(AnonObject); 504 break; 505 } 506 Ctx = Ctx->getParent(); 507 } while (Ctx->isRecord() && 508 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 509 510 // Build the expression that refers to the base object, from 511 // which we will build a sequence of member references to each 512 // of the anonymous union objects and, eventually, the field we 513 // found via name lookup. 514 bool BaseObjectIsPointer = false; 515 unsigned ExtraQuals = 0; 516 if (BaseObject) { 517 // BaseObject is an anonymous struct/union variable (and is, 518 // therefore, not part of another non-anonymous record). 519 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 520 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 521 SourceLocation()); 522 ExtraQuals 523 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 524 } else if (BaseObjectExpr) { 525 // The caller provided the base object expression. Determine 526 // whether its a pointer and whether it adds any qualifiers to the 527 // anonymous struct/union fields we're looking into. 528 QualType ObjectType = BaseObjectExpr->getType(); 529 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 530 BaseObjectIsPointer = true; 531 ObjectType = ObjectPtr->getPointeeType(); 532 } 533 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 534 } else { 535 // We've found a member of an anonymous struct/union that is 536 // inside a non-anonymous struct/union, so in a well-formed 537 // program our base object expression is "this". 538 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 539 if (!MD->isStatic()) { 540 QualType AnonFieldType 541 = Context.getTagDeclType( 542 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 543 QualType ThisType = Context.getTagDeclType(MD->getParent()); 544 if ((Context.getCanonicalType(AnonFieldType) 545 == Context.getCanonicalType(ThisType)) || 546 IsDerivedFrom(ThisType, AnonFieldType)) { 547 // Our base object expression is "this". 548 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 549 MD->getThisType(Context)); 550 BaseObjectIsPointer = true; 551 } 552 } else { 553 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 554 << Field->getDeclName()); 555 } 556 ExtraQuals = MD->getTypeQualifiers(); 557 } 558 559 if (!BaseObjectExpr) 560 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 561 << Field->getDeclName()); 562 } 563 564 // Build the implicit member references to the field of the 565 // anonymous struct/union. 566 Expr *Result = BaseObjectExpr; 567 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 568 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 569 FI != FIEnd; ++FI) { 570 QualType MemberType = (*FI)->getType(); 571 if (!(*FI)->isMutable()) { 572 unsigned combinedQualifiers 573 = MemberType.getCVRQualifiers() | ExtraQuals; 574 MemberType = MemberType.getQualifiedType(combinedQualifiers); 575 } 576 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 577 OpLoc, MemberType); 578 BaseObjectIsPointer = false; 579 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 580 } 581 582 return Owned(Result); 583} 584 585/// ActOnDeclarationNameExpr - The parser has read some kind of name 586/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 587/// performs lookup on that name and returns an expression that refers 588/// to that name. This routine isn't directly called from the parser, 589/// because the parser doesn't know about DeclarationName. Rather, 590/// this routine is called by ActOnIdentifierExpr, 591/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 592/// which form the DeclarationName from the corresponding syntactic 593/// forms. 594/// 595/// HasTrailingLParen indicates whether this identifier is used in a 596/// function call context. LookupCtx is only used for a C++ 597/// qualified-id (foo::bar) to indicate the class or namespace that 598/// the identifier must be a member of. 599/// 600/// isAddressOfOperand means that this expression is the direct operand 601/// of an address-of operator. This matters because this is the only 602/// situation where a qualified name referencing a non-static member may 603/// appear outside a member function of this class. 604Sema::OwningExprResult 605Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 606 DeclarationName Name, bool HasTrailingLParen, 607 const CXXScopeSpec *SS, 608 bool isAddressOfOperand) { 609 // Could be enum-constant, value decl, instance variable, etc. 610 if (SS && SS->isInvalid()) 611 return ExprError(); 612 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 613 false, true, Loc); 614 615 NamedDecl *D = 0; 616 if (Lookup.isAmbiguous()) { 617 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 618 SS && SS->isSet() ? SS->getRange() 619 : SourceRange()); 620 return ExprError(); 621 } else 622 D = Lookup.getAsDecl(); 623 624 // If this reference is in an Objective-C method, then ivar lookup happens as 625 // well. 626 IdentifierInfo *II = Name.getAsIdentifierInfo(); 627 if (II && getCurMethodDecl()) { 628 // There are two cases to handle here. 1) scoped lookup could have failed, 629 // in which case we should look for an ivar. 2) scoped lookup could have 630 // found a decl, but that decl is outside the current instance method (i.e. 631 // a global variable). In these two cases, we do a lookup for an ivar with 632 // this name, if the lookup sucedes, we replace it our current decl. 633 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 634 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 635 ObjCInterfaceDecl *ClassDeclared; 636 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 637 // Check if referencing a field with __attribute__((deprecated)). 638 if (DiagnoseUseOfDecl(IV, Loc)) 639 return ExprError(); 640 bool IsClsMethod = getCurMethodDecl()->isClassMethod(); 641 // If a class method attemps to use a free standing ivar, this is 642 // an error. 643 if (IsClsMethod && D && !D->isDefinedOutsideFunctionOrMethod()) 644 return ExprError(Diag(Loc, diag::error_ivar_use_in_class_method) 645 << IV->getDeclName()); 646 // If a class method uses a global variable, even if an ivar with 647 // same name exists, use the global. 648 if (!IsClsMethod) { 649 if (IV->getAccessControl() == ObjCIvarDecl::Private && 650 ClassDeclared != IFace) 651 Diag(Loc, diag::error_private_ivar_access) << IV->getDeclName(); 652 // FIXME: This should use a new expr for a direct reference, don't turn 653 // this into Self->ivar, just return a BareIVarExpr or something. 654 IdentifierInfo &II = Context.Idents.get("self"); 655 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 656 ObjCIvarRefExpr *MRef = new (Context) ObjCIvarRefExpr(IV, IV->getType(), 657 Loc, static_cast<Expr*>(SelfExpr.release()), 658 true, true); 659 Context.setFieldDecl(IFace, IV, MRef); 660 return Owned(MRef); 661 } 662 } 663 } 664 else if (getCurMethodDecl()->isInstanceMethod()) { 665 // We should warn if a local variable hides an ivar. 666 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 667 ObjCInterfaceDecl *ClassDeclared; 668 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II, ClassDeclared)) { 669 if (IV->getAccessControl() != ObjCIvarDecl::Private || 670 IFace == ClassDeclared) 671 Diag(Loc, diag::warn_ivar_use_hidden)<<IV->getDeclName(); 672 } 673 } 674 // Needed to implement property "super.method" notation. 675 if (D == 0 && II->isStr("super")) { 676 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 677 getCurMethodDecl()->getClassInterface())); 678 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 679 } 680 } 681 682 // Determine whether this name might be a candidate for 683 // argument-dependent lookup. 684 bool ADL = getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 685 HasTrailingLParen; 686 687 if (ADL && D == 0) { 688 // We've seen something of the form 689 // 690 // identifier( 691 // 692 // and we did not find any entity by the name 693 // "identifier". However, this identifier is still subject to 694 // argument-dependent lookup, so keep track of the name. 695 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 696 Context.OverloadTy, 697 Loc)); 698 } 699 700 if (D == 0) { 701 // Otherwise, this could be an implicitly declared function reference (legal 702 // in C90, extension in C99). 703 if (HasTrailingLParen && II && 704 !getLangOptions().CPlusPlus) // Not in C++. 705 D = ImplicitlyDefineFunction(Loc, *II, S); 706 else { 707 // If this name wasn't predeclared and if this is not a function call, 708 // diagnose the problem. 709 if (SS && !SS->isEmpty()) 710 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 711 << Name << SS->getRange()); 712 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 713 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 714 return ExprError(Diag(Loc, diag::err_undeclared_use) 715 << Name.getAsString()); 716 else 717 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 718 } 719 } 720 721 // If this is an expression of the form &Class::member, don't build an 722 // implicit member ref, because we want a pointer to the member in general, 723 // not any specific instance's member. 724 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 725 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 726 if (D && isa<CXXRecordDecl>(DC)) { 727 QualType DType; 728 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 729 DType = FD->getType().getNonReferenceType(); 730 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 731 DType = Method->getType(); 732 } else if (isa<OverloadedFunctionDecl>(D)) { 733 DType = Context.OverloadTy; 734 } 735 // Could be an inner type. That's diagnosed below, so ignore it here. 736 if (!DType.isNull()) { 737 // The pointer is type- and value-dependent if it points into something 738 // dependent. 739 bool Dependent = false; 740 for (; DC; DC = DC->getParent()) { 741 // FIXME: could stop early at namespace scope. 742 if (DC->isRecord()) { 743 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 744 if (Context.getTypeDeclType(Record)->isDependentType()) { 745 Dependent = true; 746 break; 747 } 748 } 749 } 750 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 751 } 752 } 753 } 754 755 // We may have found a field within an anonymous union or struct 756 // (C++ [class.union]). 757 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 758 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 759 return BuildAnonymousStructUnionMemberReference(Loc, FD); 760 761 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 762 if (!MD->isStatic()) { 763 // C++ [class.mfct.nonstatic]p2: 764 // [...] if name lookup (3.4.1) resolves the name in the 765 // id-expression to a nonstatic nontype member of class X or of 766 // a base class of X, the id-expression is transformed into a 767 // class member access expression (5.2.5) using (*this) (9.3.2) 768 // as the postfix-expression to the left of the '.' operator. 769 DeclContext *Ctx = 0; 770 QualType MemberType; 771 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 772 Ctx = FD->getDeclContext(); 773 MemberType = FD->getType(); 774 775 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 776 MemberType = RefType->getPointeeType(); 777 else if (!FD->isMutable()) { 778 unsigned combinedQualifiers 779 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 780 MemberType = MemberType.getQualifiedType(combinedQualifiers); 781 } 782 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 783 if (!Method->isStatic()) { 784 Ctx = Method->getParent(); 785 MemberType = Method->getType(); 786 } 787 } else if (OverloadedFunctionDecl *Ovl 788 = dyn_cast<OverloadedFunctionDecl>(D)) { 789 for (OverloadedFunctionDecl::function_iterator 790 Func = Ovl->function_begin(), 791 FuncEnd = Ovl->function_end(); 792 Func != FuncEnd; ++Func) { 793 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 794 if (!DMethod->isStatic()) { 795 Ctx = Ovl->getDeclContext(); 796 MemberType = Context.OverloadTy; 797 break; 798 } 799 } 800 } 801 802 if (Ctx && Ctx->isRecord()) { 803 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 804 QualType ThisType = Context.getTagDeclType(MD->getParent()); 805 if ((Context.getCanonicalType(CtxType) 806 == Context.getCanonicalType(ThisType)) || 807 IsDerivedFrom(ThisType, CtxType)) { 808 // Build the implicit member access expression. 809 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 810 MD->getThisType(Context)); 811 return Owned(new (Context) MemberExpr(This, true, D, 812 SourceLocation(), MemberType)); 813 } 814 } 815 } 816 } 817 818 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 819 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 820 if (MD->isStatic()) 821 // "invalid use of member 'x' in static member function" 822 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 823 << FD->getDeclName()); 824 } 825 826 // Any other ways we could have found the field in a well-formed 827 // program would have been turned into implicit member expressions 828 // above. 829 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 830 << FD->getDeclName()); 831 } 832 833 if (isa<TypedefDecl>(D)) 834 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 835 if (isa<ObjCInterfaceDecl>(D)) 836 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 837 if (isa<NamespaceDecl>(D)) 838 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 839 840 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 841 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 842 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 843 false, false, SS)); 844 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 845 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 846 false, false, SS)); 847 ValueDecl *VD = cast<ValueDecl>(D); 848 849 // Check whether this declaration can be used. Note that we suppress 850 // this check when we're going to perform argument-dependent lookup 851 // on this function name, because this might not be the function 852 // that overload resolution actually selects. 853 if (!(ADL && isa<FunctionDecl>(VD)) && DiagnoseUseOfDecl(VD, Loc)) 854 return ExprError(); 855 856 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 857 // Warn about constructs like: 858 // if (void *X = foo()) { ... } else { X }. 859 // In the else block, the pointer is always false. 860 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 861 Scope *CheckS = S; 862 while (CheckS) { 863 if (CheckS->isWithinElse() && 864 CheckS->getControlParent()->isDeclScope(Var)) { 865 if (Var->getType()->isBooleanType()) 866 ExprError(Diag(Loc, diag::warn_value_always_false) 867 << Var->getDeclName()); 868 else 869 ExprError(Diag(Loc, diag::warn_value_always_zero) 870 << Var->getDeclName()); 871 break; 872 } 873 874 // Move up one more control parent to check again. 875 CheckS = CheckS->getControlParent(); 876 if (CheckS) 877 CheckS = CheckS->getParent(); 878 } 879 } 880 } else if (FunctionDecl *Func = dyn_cast<FunctionDecl>(VD)) { 881 if (!getLangOptions().CPlusPlus && !Func->hasPrototype()) { 882 // C99 DR 316 says that, if a function type comes from a 883 // function definition (without a prototype), that type is only 884 // used for checking compatibility. Therefore, when referencing 885 // the function, we pretend that we don't have the full function 886 // type. 887 QualType T = Func->getType(); 888 QualType NoProtoType = T; 889 if (const FunctionProtoType *Proto = T->getAsFunctionProtoType()) 890 NoProtoType = Context.getFunctionNoProtoType(Proto->getResultType()); 891 return Owned(BuildDeclRefExpr(VD, NoProtoType, Loc, false, false, SS)); 892 } 893 } 894 895 // Only create DeclRefExpr's for valid Decl's. 896 if (VD->isInvalidDecl()) 897 return ExprError(); 898 899 // If the identifier reference is inside a block, and it refers to a value 900 // that is outside the block, create a BlockDeclRefExpr instead of a 901 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 902 // the block is formed. 903 // 904 // We do not do this for things like enum constants, global variables, etc, 905 // as they do not get snapshotted. 906 // 907 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 908 // Blocks that have these can't be constant. 909 CurBlock->hasBlockDeclRefExprs = true; 910 911 // The BlocksAttr indicates the variable is bound by-reference. 912 if (VD->getAttr<BlocksAttr>()) 913 return Owned(new (Context) BlockDeclRefExpr(VD, 914 VD->getType().getNonReferenceType(), Loc, true)); 915 916 // Variable will be bound by-copy, make it const within the closure. 917 VD->getType().addConst(); 918 return Owned(new (Context) BlockDeclRefExpr(VD, 919 VD->getType().getNonReferenceType(), Loc, false)); 920 } 921 // If this reference is not in a block or if the referenced variable is 922 // within the block, create a normal DeclRefExpr. 923 924 bool TypeDependent = false; 925 bool ValueDependent = false; 926 if (getLangOptions().CPlusPlus) { 927 // C++ [temp.dep.expr]p3: 928 // An id-expression is type-dependent if it contains: 929 // - an identifier that was declared with a dependent type, 930 if (VD->getType()->isDependentType()) 931 TypeDependent = true; 932 // - FIXME: a template-id that is dependent, 933 // - a conversion-function-id that specifies a dependent type, 934 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 935 Name.getCXXNameType()->isDependentType()) 936 TypeDependent = true; 937 // - a nested-name-specifier that contains a class-name that 938 // names a dependent type. 939 else if (SS && !SS->isEmpty()) { 940 for (DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 941 DC; DC = DC->getParent()) { 942 // FIXME: could stop early at namespace scope. 943 if (DC->isRecord()) { 944 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 945 if (Context.getTypeDeclType(Record)->isDependentType()) { 946 TypeDependent = true; 947 break; 948 } 949 } 950 } 951 } 952 953 // C++ [temp.dep.constexpr]p2: 954 // 955 // An identifier is value-dependent if it is: 956 // - a name declared with a dependent type, 957 if (TypeDependent) 958 ValueDependent = true; 959 // - the name of a non-type template parameter, 960 else if (isa<NonTypeTemplateParmDecl>(VD)) 961 ValueDependent = true; 962 // - a constant with integral or enumeration type and is 963 // initialized with an expression that is value-dependent 964 // (FIXME!). 965 } 966 967 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 968 TypeDependent, ValueDependent, SS)); 969} 970 971Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 972 tok::TokenKind Kind) { 973 PredefinedExpr::IdentType IT; 974 975 switch (Kind) { 976 default: assert(0 && "Unknown simple primary expr!"); 977 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 978 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 979 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 980 } 981 982 // Pre-defined identifiers are of type char[x], where x is the length of the 983 // string. 984 unsigned Length; 985 if (FunctionDecl *FD = getCurFunctionDecl()) 986 Length = FD->getIdentifier()->getLength(); 987 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 988 Length = MD->getSynthesizedMethodSize(); 989 else { 990 Diag(Loc, diag::ext_predef_outside_function); 991 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 992 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 993 } 994 995 996 llvm::APInt LengthI(32, Length + 1); 997 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 998 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 999 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 1000} 1001 1002Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 1003 llvm::SmallString<16> CharBuffer; 1004 CharBuffer.resize(Tok.getLength()); 1005 const char *ThisTokBegin = &CharBuffer[0]; 1006 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1007 1008 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1009 Tok.getLocation(), PP); 1010 if (Literal.hadError()) 1011 return ExprError(); 1012 1013 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 1014 1015 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 1016 Literal.isWide(), 1017 type, Tok.getLocation())); 1018} 1019 1020Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 1021 // Fast path for a single digit (which is quite common). A single digit 1022 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 1023 if (Tok.getLength() == 1) { 1024 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 1025 unsigned IntSize = Context.Target.getIntWidth(); 1026 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 1027 Context.IntTy, Tok.getLocation())); 1028 } 1029 1030 llvm::SmallString<512> IntegerBuffer; 1031 // Add padding so that NumericLiteralParser can overread by one character. 1032 IntegerBuffer.resize(Tok.getLength()+1); 1033 const char *ThisTokBegin = &IntegerBuffer[0]; 1034 1035 // Get the spelling of the token, which eliminates trigraphs, etc. 1036 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 1037 1038 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 1039 Tok.getLocation(), PP); 1040 if (Literal.hadError) 1041 return ExprError(); 1042 1043 Expr *Res; 1044 1045 if (Literal.isFloatingLiteral()) { 1046 QualType Ty; 1047 if (Literal.isFloat) 1048 Ty = Context.FloatTy; 1049 else if (!Literal.isLong) 1050 Ty = Context.DoubleTy; 1051 else 1052 Ty = Context.LongDoubleTy; 1053 1054 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 1055 1056 // isExact will be set by GetFloatValue(). 1057 bool isExact = false; 1058 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 1059 &isExact, Ty, Tok.getLocation()); 1060 1061 } else if (!Literal.isIntegerLiteral()) { 1062 return ExprError(); 1063 } else { 1064 QualType Ty; 1065 1066 // long long is a C99 feature. 1067 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 1068 Literal.isLongLong) 1069 Diag(Tok.getLocation(), diag::ext_longlong); 1070 1071 // Get the value in the widest-possible width. 1072 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 1073 1074 if (Literal.GetIntegerValue(ResultVal)) { 1075 // If this value didn't fit into uintmax_t, warn and force to ull. 1076 Diag(Tok.getLocation(), diag::warn_integer_too_large); 1077 Ty = Context.UnsignedLongLongTy; 1078 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 1079 "long long is not intmax_t?"); 1080 } else { 1081 // If this value fits into a ULL, try to figure out what else it fits into 1082 // according to the rules of C99 6.4.4.1p5. 1083 1084 // Octal, Hexadecimal, and integers with a U suffix are allowed to 1085 // be an unsigned int. 1086 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 1087 1088 // Check from smallest to largest, picking the smallest type we can. 1089 unsigned Width = 0; 1090 if (!Literal.isLong && !Literal.isLongLong) { 1091 // Are int/unsigned possibilities? 1092 unsigned IntSize = Context.Target.getIntWidth(); 1093 1094 // Does it fit in a unsigned int? 1095 if (ResultVal.isIntN(IntSize)) { 1096 // Does it fit in a signed int? 1097 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 1098 Ty = Context.IntTy; 1099 else if (AllowUnsigned) 1100 Ty = Context.UnsignedIntTy; 1101 Width = IntSize; 1102 } 1103 } 1104 1105 // Are long/unsigned long possibilities? 1106 if (Ty.isNull() && !Literal.isLongLong) { 1107 unsigned LongSize = Context.Target.getLongWidth(); 1108 1109 // Does it fit in a unsigned long? 1110 if (ResultVal.isIntN(LongSize)) { 1111 // Does it fit in a signed long? 1112 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1113 Ty = Context.LongTy; 1114 else if (AllowUnsigned) 1115 Ty = Context.UnsignedLongTy; 1116 Width = LongSize; 1117 } 1118 } 1119 1120 // Finally, check long long if needed. 1121 if (Ty.isNull()) { 1122 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1123 1124 // Does it fit in a unsigned long long? 1125 if (ResultVal.isIntN(LongLongSize)) { 1126 // Does it fit in a signed long long? 1127 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1128 Ty = Context.LongLongTy; 1129 else if (AllowUnsigned) 1130 Ty = Context.UnsignedLongLongTy; 1131 Width = LongLongSize; 1132 } 1133 } 1134 1135 // If we still couldn't decide a type, we probably have something that 1136 // does not fit in a signed long long, but has no U suffix. 1137 if (Ty.isNull()) { 1138 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1139 Ty = Context.UnsignedLongLongTy; 1140 Width = Context.Target.getLongLongWidth(); 1141 } 1142 1143 if (ResultVal.getBitWidth() != Width) 1144 ResultVal.trunc(Width); 1145 } 1146 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1147 } 1148 1149 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1150 if (Literal.isImaginary) 1151 Res = new (Context) ImaginaryLiteral(Res, 1152 Context.getComplexType(Res->getType())); 1153 1154 return Owned(Res); 1155} 1156 1157Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1158 SourceLocation R, ExprArg Val) { 1159 Expr *E = (Expr *)Val.release(); 1160 assert((E != 0) && "ActOnParenExpr() missing expr"); 1161 return Owned(new (Context) ParenExpr(L, R, E)); 1162} 1163 1164/// The UsualUnaryConversions() function is *not* called by this routine. 1165/// See C99 6.3.2.1p[2-4] for more details. 1166bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1167 SourceLocation OpLoc, 1168 const SourceRange &ExprRange, 1169 bool isSizeof) { 1170 if (exprType->isDependentType()) 1171 return false; 1172 1173 // C99 6.5.3.4p1: 1174 if (isa<FunctionType>(exprType)) { 1175 // alignof(function) is allowed. 1176 if (isSizeof) 1177 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1178 return false; 1179 } 1180 1181 if (exprType->isVoidType()) { 1182 Diag(OpLoc, diag::ext_sizeof_void_type) 1183 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1184 return false; 1185 } 1186 1187 return DiagnoseIncompleteType(OpLoc, exprType, 1188 isSizeof ? diag::err_sizeof_incomplete_type : 1189 diag::err_alignof_incomplete_type, 1190 ExprRange); 1191} 1192 1193bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1194 const SourceRange &ExprRange) { 1195 E = E->IgnoreParens(); 1196 1197 // alignof decl is always ok. 1198 if (isa<DeclRefExpr>(E)) 1199 return false; 1200 1201 // Cannot know anything else if the expression is dependent. 1202 if (E->isTypeDependent()) 1203 return false; 1204 1205 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1206 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { 1207 if (FD->isBitField()) { 1208 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1209 return true; 1210 } 1211 // Other fields are ok. 1212 return false; 1213 } 1214 } 1215 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1216} 1217 1218/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1219/// the same for @c alignof and @c __alignof 1220/// Note that the ArgRange is invalid if isType is false. 1221Action::OwningExprResult 1222Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1223 void *TyOrEx, const SourceRange &ArgRange) { 1224 // If error parsing type, ignore. 1225 if (TyOrEx == 0) return ExprError(); 1226 1227 QualType ArgTy; 1228 SourceRange Range; 1229 if (isType) { 1230 ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1231 Range = ArgRange; 1232 1233 // Verify that the operand is valid. 1234 if (CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, isSizeof)) 1235 return ExprError(); 1236 } else { 1237 // Get the end location. 1238 Expr *ArgEx = (Expr *)TyOrEx; 1239 Range = ArgEx->getSourceRange(); 1240 ArgTy = ArgEx->getType(); 1241 1242 // Verify that the operand is valid. 1243 bool isInvalid; 1244 if (!isSizeof) { 1245 isInvalid = CheckAlignOfExpr(ArgEx, OpLoc, Range); 1246 } else if (ArgEx->isBitField()) { // C99 6.5.3.4p1. 1247 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1248 isInvalid = true; 1249 } else { 1250 isInvalid = CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, true); 1251 } 1252 1253 if (isInvalid) { 1254 DeleteExpr(ArgEx); 1255 return ExprError(); 1256 } 1257 } 1258 1259 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1260 return Owned(new (Context) SizeOfAlignOfExpr(isSizeof, isType, TyOrEx, 1261 Context.getSizeType(), OpLoc, 1262 Range.getEnd())); 1263} 1264 1265QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc, bool isReal) { 1266 if (V->isTypeDependent()) 1267 return Context.DependentTy; 1268 1269 DefaultFunctionArrayConversion(V); 1270 1271 // These operators return the element type of a complex type. 1272 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1273 return CT->getElementType(); 1274 1275 // Otherwise they pass through real integer and floating point types here. 1276 if (V->getType()->isArithmeticType()) 1277 return V->getType(); 1278 1279 // Reject anything else. 1280 Diag(Loc, diag::err_realimag_invalid_type) << V->getType() 1281 << (isReal ? "__real" : "__imag"); 1282 return QualType(); 1283} 1284 1285 1286 1287Action::OwningExprResult 1288Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1289 tok::TokenKind Kind, ExprArg Input) { 1290 Expr *Arg = (Expr *)Input.get(); 1291 1292 UnaryOperator::Opcode Opc; 1293 switch (Kind) { 1294 default: assert(0 && "Unknown unary op!"); 1295 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1296 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1297 } 1298 1299 if (getLangOptions().CPlusPlus && 1300 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1301 // Which overloaded operator? 1302 OverloadedOperatorKind OverOp = 1303 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1304 1305 // C++ [over.inc]p1: 1306 // 1307 // [...] If the function is a member function with one 1308 // parameter (which shall be of type int) or a non-member 1309 // function with two parameters (the second of which shall be 1310 // of type int), it defines the postfix increment operator ++ 1311 // for objects of that type. When the postfix increment is 1312 // called as a result of using the ++ operator, the int 1313 // argument will have value zero. 1314 Expr *Args[2] = { 1315 Arg, 1316 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1317 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1318 }; 1319 1320 // Build the candidate set for overloading 1321 OverloadCandidateSet CandidateSet; 1322 if (AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet)) 1323 return ExprError(); 1324 1325 // Perform overload resolution. 1326 OverloadCandidateSet::iterator Best; 1327 switch (BestViableFunction(CandidateSet, Best)) { 1328 case OR_Success: { 1329 // We found a built-in operator or an overloaded operator. 1330 FunctionDecl *FnDecl = Best->Function; 1331 1332 if (FnDecl) { 1333 // We matched an overloaded operator. Build a call to that 1334 // operator. 1335 1336 // Convert the arguments. 1337 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1338 if (PerformObjectArgumentInitialization(Arg, Method)) 1339 return ExprError(); 1340 } else { 1341 // Convert the arguments. 1342 if (PerformCopyInitialization(Arg, 1343 FnDecl->getParamDecl(0)->getType(), 1344 "passing")) 1345 return ExprError(); 1346 } 1347 1348 // Determine the result type 1349 QualType ResultTy 1350 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1351 ResultTy = ResultTy.getNonReferenceType(); 1352 1353 // Build the actual expression node. 1354 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1355 SourceLocation()); 1356 UsualUnaryConversions(FnExpr); 1357 1358 Input.release(); 1359 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 1360 ResultTy, OpLoc)); 1361 } else { 1362 // We matched a built-in operator. Convert the arguments, then 1363 // break out so that we will build the appropriate built-in 1364 // operator node. 1365 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1366 "passing")) 1367 return ExprError(); 1368 1369 break; 1370 } 1371 } 1372 1373 case OR_No_Viable_Function: 1374 // No viable function; fall through to handling this as a 1375 // built-in operator, which will produce an error message for us. 1376 break; 1377 1378 case OR_Ambiguous: 1379 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1380 << UnaryOperator::getOpcodeStr(Opc) 1381 << Arg->getSourceRange(); 1382 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1383 return ExprError(); 1384 1385 case OR_Deleted: 1386 Diag(OpLoc, diag::err_ovl_deleted_oper) 1387 << Best->Function->isDeleted() 1388 << UnaryOperator::getOpcodeStr(Opc) 1389 << Arg->getSourceRange(); 1390 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1391 return ExprError(); 1392 } 1393 1394 // Either we found no viable overloaded operator or we matched a 1395 // built-in operator. In either case, fall through to trying to 1396 // build a built-in operation. 1397 } 1398 1399 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1400 Opc == UnaryOperator::PostInc); 1401 if (result.isNull()) 1402 return ExprError(); 1403 Input.release(); 1404 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1405} 1406 1407Action::OwningExprResult 1408Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1409 ExprArg Idx, SourceLocation RLoc) { 1410 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1411 *RHSExp = static_cast<Expr*>(Idx.get()); 1412 1413 if (getLangOptions().CPlusPlus && 1414 (LHSExp->getType()->isRecordType() || 1415 LHSExp->getType()->isEnumeralType() || 1416 RHSExp->getType()->isRecordType() || 1417 RHSExp->getType()->isEnumeralType())) { 1418 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1419 // to the candidate set. 1420 OverloadCandidateSet CandidateSet; 1421 Expr *Args[2] = { LHSExp, RHSExp }; 1422 if (AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1423 SourceRange(LLoc, RLoc))) 1424 return ExprError(); 1425 1426 // Perform overload resolution. 1427 OverloadCandidateSet::iterator Best; 1428 switch (BestViableFunction(CandidateSet, Best)) { 1429 case OR_Success: { 1430 // We found a built-in operator or an overloaded operator. 1431 FunctionDecl *FnDecl = Best->Function; 1432 1433 if (FnDecl) { 1434 // We matched an overloaded operator. Build a call to that 1435 // operator. 1436 1437 // Convert the arguments. 1438 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1439 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1440 PerformCopyInitialization(RHSExp, 1441 FnDecl->getParamDecl(0)->getType(), 1442 "passing")) 1443 return ExprError(); 1444 } else { 1445 // Convert the arguments. 1446 if (PerformCopyInitialization(LHSExp, 1447 FnDecl->getParamDecl(0)->getType(), 1448 "passing") || 1449 PerformCopyInitialization(RHSExp, 1450 FnDecl->getParamDecl(1)->getType(), 1451 "passing")) 1452 return ExprError(); 1453 } 1454 1455 // Determine the result type 1456 QualType ResultTy 1457 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1458 ResultTy = ResultTy.getNonReferenceType(); 1459 1460 // Build the actual expression node. 1461 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1462 SourceLocation()); 1463 UsualUnaryConversions(FnExpr); 1464 1465 Base.release(); 1466 Idx.release(); 1467 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 1468 ResultTy, LLoc)); 1469 } else { 1470 // We matched a built-in operator. Convert the arguments, then 1471 // break out so that we will build the appropriate built-in 1472 // operator node. 1473 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1474 "passing") || 1475 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1476 "passing")) 1477 return ExprError(); 1478 1479 break; 1480 } 1481 } 1482 1483 case OR_No_Viable_Function: 1484 // No viable function; fall through to handling this as a 1485 // built-in operator, which will produce an error message for us. 1486 break; 1487 1488 case OR_Ambiguous: 1489 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1490 << "[]" 1491 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1492 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1493 return ExprError(); 1494 1495 case OR_Deleted: 1496 Diag(LLoc, diag::err_ovl_deleted_oper) 1497 << Best->Function->isDeleted() 1498 << "[]" 1499 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1500 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1501 return ExprError(); 1502 } 1503 1504 // Either we found no viable overloaded operator or we matched a 1505 // built-in operator. In either case, fall through to trying to 1506 // build a built-in operation. 1507 } 1508 1509 // Perform default conversions. 1510 DefaultFunctionArrayConversion(LHSExp); 1511 DefaultFunctionArrayConversion(RHSExp); 1512 1513 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1514 1515 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1516 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1517 // in the subscript position. As a result, we need to derive the array base 1518 // and index from the expression types. 1519 Expr *BaseExpr, *IndexExpr; 1520 QualType ResultType; 1521 if (LHSTy->isDependentType() || RHSTy->isDependentType()) { 1522 BaseExpr = LHSExp; 1523 IndexExpr = RHSExp; 1524 ResultType = Context.DependentTy; 1525 } else if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1526 BaseExpr = LHSExp; 1527 IndexExpr = RHSExp; 1528 // FIXME: need to deal with const... 1529 ResultType = PTy->getPointeeType(); 1530 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1531 // Handle the uncommon case of "123[Ptr]". 1532 BaseExpr = RHSExp; 1533 IndexExpr = LHSExp; 1534 // FIXME: need to deal with const... 1535 ResultType = PTy->getPointeeType(); 1536 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1537 BaseExpr = LHSExp; // vectors: V[123] 1538 IndexExpr = RHSExp; 1539 1540 // FIXME: need to deal with const... 1541 ResultType = VTy->getElementType(); 1542 } else { 1543 return ExprError(Diag(LHSExp->getLocStart(), 1544 diag::err_typecheck_subscript_value) << RHSExp->getSourceRange()); 1545 } 1546 // C99 6.5.2.1p1 1547 if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent()) 1548 return ExprError(Diag(IndexExpr->getLocStart(), 1549 diag::err_typecheck_subscript) << IndexExpr->getSourceRange()); 1550 1551 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 1552 // the following check catches trying to index a pointer to a function (e.g. 1553 // void (*)(int)) and pointers to incomplete types. Functions are not 1554 // objects in C99. 1555 if (!ResultType->isObjectType() && !ResultType->isDependentType()) 1556 return ExprError(Diag(BaseExpr->getLocStart(), 1557 diag::err_typecheck_subscript_not_object) 1558 << BaseExpr->getType() << BaseExpr->getSourceRange()); 1559 1560 Base.release(); 1561 Idx.release(); 1562 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1563 ResultType, RLoc)); 1564} 1565 1566QualType Sema:: 1567CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1568 IdentifierInfo &CompName, SourceLocation CompLoc) { 1569 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1570 1571 // The vector accessor can't exceed the number of elements. 1572 const char *compStr = CompName.getName(); 1573 1574 // This flag determines whether or not the component is one of the four 1575 // special names that indicate a subset of exactly half the elements are 1576 // to be selected. 1577 bool HalvingSwizzle = false; 1578 1579 // This flag determines whether or not CompName has an 's' char prefix, 1580 // indicating that it is a string of hex values to be used as vector indices. 1581 bool HexSwizzle = *compStr == 's'; 1582 1583 // Check that we've found one of the special components, or that the component 1584 // names must come from the same set. 1585 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1586 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1587 HalvingSwizzle = true; 1588 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1589 do 1590 compStr++; 1591 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1592 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1593 do 1594 compStr++; 1595 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1596 } 1597 1598 if (!HalvingSwizzle && *compStr) { 1599 // We didn't get to the end of the string. This means the component names 1600 // didn't come from the same set *or* we encountered an illegal name. 1601 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1602 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1603 return QualType(); 1604 } 1605 1606 // Ensure no component accessor exceeds the width of the vector type it 1607 // operates on. 1608 if (!HalvingSwizzle) { 1609 compStr = CompName.getName(); 1610 1611 if (HexSwizzle) 1612 compStr++; 1613 1614 while (*compStr) { 1615 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1616 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1617 << baseType << SourceRange(CompLoc); 1618 return QualType(); 1619 } 1620 } 1621 } 1622 1623 // If this is a halving swizzle, verify that the base type has an even 1624 // number of elements. 1625 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1626 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1627 << baseType << SourceRange(CompLoc); 1628 return QualType(); 1629 } 1630 1631 // The component accessor looks fine - now we need to compute the actual type. 1632 // The vector type is implied by the component accessor. For example, 1633 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1634 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1635 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1636 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1637 : CompName.getLength(); 1638 if (HexSwizzle) 1639 CompSize--; 1640 1641 if (CompSize == 1) 1642 return vecType->getElementType(); 1643 1644 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1645 // Now look up the TypeDefDecl from the vector type. Without this, 1646 // diagostics look bad. We want extended vector types to appear built-in. 1647 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1648 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1649 return Context.getTypedefType(ExtVectorDecls[i]); 1650 } 1651 return VT; // should never get here (a typedef type should always be found). 1652} 1653 1654 1655/// constructSetterName - Return the setter name for the given 1656/// identifier, i.e. "set" + Name where the initial character of Name 1657/// has been capitalized. 1658// FIXME: Merge with same routine in Parser. But where should this 1659// live? 1660static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 1661 const IdentifierInfo *Name) { 1662 llvm::SmallString<100> SelectorName; 1663 SelectorName = "set"; 1664 SelectorName.append(Name->getName(), Name->getName()+Name->getLength()); 1665 SelectorName[3] = toupper(SelectorName[3]); 1666 return &Idents.get(&SelectorName[0], &SelectorName[SelectorName.size()]); 1667} 1668 1669Action::OwningExprResult 1670Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1671 tok::TokenKind OpKind, SourceLocation MemberLoc, 1672 IdentifierInfo &Member) { 1673 Expr *BaseExpr = static_cast<Expr *>(Base.release()); 1674 assert(BaseExpr && "no record expression"); 1675 1676 // Perform default conversions. 1677 DefaultFunctionArrayConversion(BaseExpr); 1678 1679 QualType BaseType = BaseExpr->getType(); 1680 assert(!BaseType.isNull() && "no type for member expression"); 1681 1682 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1683 // must have pointer type, and the accessed type is the pointee. 1684 if (OpKind == tok::arrow) { 1685 if (const PointerType *PT = BaseType->getAsPointerType()) 1686 BaseType = PT->getPointeeType(); 1687 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1688 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1689 MemberLoc, Member)); 1690 else 1691 return ExprError(Diag(MemberLoc, 1692 diag::err_typecheck_member_reference_arrow) 1693 << BaseType << BaseExpr->getSourceRange()); 1694 } 1695 1696 // Handle field access to simple records. This also handles access to fields 1697 // of the ObjC 'id' struct. 1698 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1699 RecordDecl *RDecl = RTy->getDecl(); 1700 if (DiagnoseIncompleteType(OpLoc, BaseType, 1701 diag::err_typecheck_incomplete_tag, 1702 BaseExpr->getSourceRange())) 1703 return ExprError(); 1704 1705 // The record definition is complete, now make sure the member is valid. 1706 // FIXME: Qualified name lookup for C++ is a bit more complicated 1707 // than this. 1708 LookupResult Result 1709 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1710 LookupMemberName, false); 1711 1712 NamedDecl *MemberDecl = 0; 1713 if (!Result) 1714 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1715 << &Member << BaseExpr->getSourceRange()); 1716 else if (Result.isAmbiguous()) { 1717 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1718 MemberLoc, BaseExpr->getSourceRange()); 1719 return ExprError(); 1720 } else 1721 MemberDecl = Result; 1722 1723 // If the decl being referenced had an error, return an error for this 1724 // sub-expr without emitting another error, in order to avoid cascading 1725 // error cases. 1726 if (MemberDecl->isInvalidDecl()) 1727 return ExprError(); 1728 1729 // Check the use of this field 1730 if (DiagnoseUseOfDecl(MemberDecl, MemberLoc)) 1731 return ExprError(); 1732 1733 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1734 // We may have found a field within an anonymous union or struct 1735 // (C++ [class.union]). 1736 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1737 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1738 BaseExpr, OpLoc); 1739 1740 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1741 // FIXME: Handle address space modifiers 1742 QualType MemberType = FD->getType(); 1743 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1744 MemberType = Ref->getPointeeType(); 1745 else { 1746 unsigned combinedQualifiers = 1747 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1748 if (FD->isMutable()) 1749 combinedQualifiers &= ~QualType::Const; 1750 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1751 } 1752 1753 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1754 MemberLoc, MemberType)); 1755 } else if (CXXClassVarDecl *Var = dyn_cast<CXXClassVarDecl>(MemberDecl)) 1756 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1757 Var, MemberLoc, 1758 Var->getType().getNonReferenceType())); 1759 else if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 1760 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1761 MemberFn, MemberLoc, MemberFn->getType())); 1762 else if (OverloadedFunctionDecl *Ovl 1763 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 1764 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 1765 MemberLoc, Context.OverloadTy)); 1766 else if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 1767 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1768 Enum, MemberLoc, Enum->getType())); 1769 else if (isa<TypeDecl>(MemberDecl)) 1770 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 1771 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1772 1773 // We found a declaration kind that we didn't expect. This is a 1774 // generic error message that tells the user that she can't refer 1775 // to this member with '.' or '->'. 1776 return ExprError(Diag(MemberLoc, 1777 diag::err_typecheck_member_reference_unknown) 1778 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1779 } 1780 1781 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1782 // (*Obj).ivar. 1783 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1784 ObjCInterfaceDecl *ClassDeclared; 1785 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member, 1786 ClassDeclared)) { 1787 // If the decl being referenced had an error, return an error for this 1788 // sub-expr without emitting another error, in order to avoid cascading 1789 // error cases. 1790 if (IV->isInvalidDecl()) 1791 return ExprError(); 1792 1793 // Check whether we can reference this field. 1794 if (DiagnoseUseOfDecl(IV, MemberLoc)) 1795 return ExprError(); 1796 if (IV->getAccessControl() != ObjCIvarDecl::Public) { 1797 ObjCInterfaceDecl *ClassOfMethodDecl = 0; 1798 if (ObjCMethodDecl *MD = getCurMethodDecl()) 1799 ClassOfMethodDecl = MD->getClassInterface(); 1800 if (IV->getAccessControl() == ObjCIvarDecl::Private) { 1801 if (ClassDeclared != IFTy->getDecl() || 1802 ClassOfMethodDecl != ClassDeclared) 1803 Diag(MemberLoc, diag::error_private_ivar_access) << IV->getDeclName(); 1804 } 1805 // @protected 1806 else if (!IFTy->getDecl()->isSuperClassOf(ClassOfMethodDecl)) 1807 Diag(MemberLoc, diag::error_protected_ivar_access) << IV->getDeclName(); 1808 } 1809 1810 ObjCIvarRefExpr *MRef= new (Context) ObjCIvarRefExpr(IV, IV->getType(), 1811 MemberLoc, BaseExpr, 1812 OpKind == tok::arrow); 1813 Context.setFieldDecl(IFTy->getDecl(), IV, MRef); 1814 return Owned(MRef); 1815 } 1816 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1817 << IFTy->getDecl()->getDeclName() << &Member 1818 << BaseExpr->getSourceRange()); 1819 } 1820 1821 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1822 // pointer to a (potentially qualified) interface type. 1823 const PointerType *PTy; 1824 const ObjCInterfaceType *IFTy; 1825 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1826 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1827 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1828 1829 // Search for a declared property first. 1830 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) { 1831 // Check whether we can reference this property. 1832 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1833 return ExprError(); 1834 1835 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1836 MemberLoc, BaseExpr)); 1837 } 1838 1839 // Check protocols on qualified interfaces. 1840 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1841 E = IFTy->qual_end(); I != E; ++I) 1842 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1843 // Check whether we can reference this property. 1844 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1845 return ExprError(); 1846 1847 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1848 MemberLoc, BaseExpr)); 1849 } 1850 1851 // If that failed, look for an "implicit" property by seeing if the nullary 1852 // selector is implemented. 1853 1854 // FIXME: The logic for looking up nullary and unary selectors should be 1855 // shared with the code in ActOnInstanceMessage. 1856 1857 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1858 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1859 1860 // If this reference is in an @implementation, check for 'private' methods. 1861 if (!Getter) 1862 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1863 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1864 if (ObjCImplementationDecl *ImpDecl = 1865 ObjCImplementations[ClassDecl->getIdentifier()]) 1866 Getter = ImpDecl->getInstanceMethod(Sel); 1867 1868 // Look through local category implementations associated with the class. 1869 if (!Getter) { 1870 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1871 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1872 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1873 } 1874 } 1875 if (Getter) { 1876 // Check if we can reference this property. 1877 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1878 return ExprError(); 1879 1880 // If we found a getter then this may be a valid dot-reference, we 1881 // will look for the matching setter, in case it is needed. 1882 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 1883 &Member); 1884 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 1885 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1886 if (!Setter) { 1887 // If this reference is in an @implementation, also check for 'private' 1888 // methods. 1889 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1890 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1891 if (ObjCImplementationDecl *ImpDecl = 1892 ObjCImplementations[ClassDecl->getIdentifier()]) 1893 Setter = ImpDecl->getInstanceMethod(SetterSel); 1894 } 1895 // Look through local category implementations associated with the class. 1896 if (!Setter) { 1897 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 1898 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1899 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 1900 } 1901 } 1902 1903 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1904 return ExprError(); 1905 1906 // FIXME: we must check that the setter has property type. 1907 return Owned(new (Context) ObjCKVCRefExpr(Getter, Getter->getResultType(), 1908 Setter, MemberLoc, BaseExpr)); 1909 } 1910 1911 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 1912 << &Member << BaseType); 1913 } 1914 // Handle properties on qualified "id" protocols. 1915 const ObjCQualifiedIdType *QIdTy; 1916 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1917 // Check protocols on qualified interfaces. 1918 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1919 E = QIdTy->qual_end(); I != E; ++I) { 1920 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) { 1921 // Check the use of this declaration 1922 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1923 return ExprError(); 1924 1925 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1926 MemberLoc, BaseExpr)); 1927 } 1928 // Also must look for a getter name which uses property syntax. 1929 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1930 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1931 // Check the use of this method. 1932 if (DiagnoseUseOfDecl(OMD, MemberLoc)) 1933 return ExprError(); 1934 1935 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 1936 OMD->getResultType(), OMD, OpLoc, MemberLoc, NULL, 0)); 1937 } 1938 } 1939 1940 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 1941 << &Member << BaseType); 1942 } 1943 // Handle 'field access' to vectors, such as 'V.xx'. 1944 if (BaseType->isExtVectorType()) { 1945 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1946 if (ret.isNull()) 1947 return ExprError(); 1948 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 1949 MemberLoc)); 1950 } 1951 1952 return ExprError(Diag(MemberLoc, 1953 diag::err_typecheck_member_reference_struct_union) 1954 << BaseType << BaseExpr->getSourceRange()); 1955} 1956 1957/// ConvertArgumentsForCall - Converts the arguments specified in 1958/// Args/NumArgs to the parameter types of the function FDecl with 1959/// function prototype Proto. Call is the call expression itself, and 1960/// Fn is the function expression. For a C++ member function, this 1961/// routine does not attempt to convert the object argument. Returns 1962/// true if the call is ill-formed. 1963bool 1964Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 1965 FunctionDecl *FDecl, 1966 const FunctionProtoType *Proto, 1967 Expr **Args, unsigned NumArgs, 1968 SourceLocation RParenLoc) { 1969 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1970 // assignment, to the types of the corresponding parameter, ... 1971 unsigned NumArgsInProto = Proto->getNumArgs(); 1972 unsigned NumArgsToCheck = NumArgs; 1973 bool Invalid = false; 1974 1975 // If too few arguments are available (and we don't have default 1976 // arguments for the remaining parameters), don't make the call. 1977 if (NumArgs < NumArgsInProto) { 1978 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 1979 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 1980 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 1981 // Use default arguments for missing arguments 1982 NumArgsToCheck = NumArgsInProto; 1983 Call->setNumArgs(Context, NumArgsInProto); 1984 } 1985 1986 // If too many are passed and not variadic, error on the extras and drop 1987 // them. 1988 if (NumArgs > NumArgsInProto) { 1989 if (!Proto->isVariadic()) { 1990 Diag(Args[NumArgsInProto]->getLocStart(), 1991 diag::err_typecheck_call_too_many_args) 1992 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 1993 << SourceRange(Args[NumArgsInProto]->getLocStart(), 1994 Args[NumArgs-1]->getLocEnd()); 1995 // This deletes the extra arguments. 1996 Call->setNumArgs(Context, NumArgsInProto); 1997 Invalid = true; 1998 } 1999 NumArgsToCheck = NumArgsInProto; 2000 } 2001 2002 // Continue to check argument types (even if we have too few/many args). 2003 for (unsigned i = 0; i != NumArgsToCheck; i++) { 2004 QualType ProtoArgType = Proto->getArgType(i); 2005 2006 Expr *Arg; 2007 if (i < NumArgs) { 2008 Arg = Args[i]; 2009 2010 // Pass the argument. 2011 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 2012 return true; 2013 } else 2014 // We already type-checked the argument, so we know it works. 2015 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 2016 QualType ArgType = Arg->getType(); 2017 2018 Call->setArg(i, Arg); 2019 } 2020 2021 // If this is a variadic call, handle args passed through "...". 2022 if (Proto->isVariadic()) { 2023 VariadicCallType CallType = VariadicFunction; 2024 if (Fn->getType()->isBlockPointerType()) 2025 CallType = VariadicBlock; // Block 2026 else if (isa<MemberExpr>(Fn)) 2027 CallType = VariadicMethod; 2028 2029 // Promote the arguments (C99 6.5.2.2p7). 2030 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 2031 Expr *Arg = Args[i]; 2032 DefaultVariadicArgumentPromotion(Arg, CallType); 2033 Call->setArg(i, Arg); 2034 } 2035 } 2036 2037 return Invalid; 2038} 2039 2040/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 2041/// This provides the location of the left/right parens and a list of comma 2042/// locations. 2043Action::OwningExprResult 2044Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 2045 MultiExprArg args, 2046 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 2047 unsigned NumArgs = args.size(); 2048 Expr *Fn = static_cast<Expr *>(fn.release()); 2049 Expr **Args = reinterpret_cast<Expr**>(args.release()); 2050 assert(Fn && "no function call expression"); 2051 FunctionDecl *FDecl = NULL; 2052 DeclarationName UnqualifiedName; 2053 2054 if (getLangOptions().CPlusPlus) { 2055 // Determine whether this is a dependent call inside a C++ template, 2056 // in which case we won't do any semantic analysis now. 2057 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 2058 bool Dependent = false; 2059 if (Fn->isTypeDependent()) 2060 Dependent = true; 2061 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 2062 Dependent = true; 2063 2064 if (Dependent) 2065 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 2066 Context.DependentTy, RParenLoc)); 2067 2068 // Determine whether this is a call to an object (C++ [over.call.object]). 2069 if (Fn->getType()->isRecordType()) 2070 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 2071 CommaLocs, RParenLoc)); 2072 2073 // Determine whether this is a call to a member function. 2074 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 2075 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 2076 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 2077 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 2078 CommaLocs, RParenLoc)); 2079 } 2080 2081 // If we're directly calling a function, get the appropriate declaration. 2082 DeclRefExpr *DRExpr = NULL; 2083 Expr *FnExpr = Fn; 2084 bool ADL = true; 2085 while (true) { 2086 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 2087 FnExpr = IcExpr->getSubExpr(); 2088 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 2089 // Parentheses around a function disable ADL 2090 // (C++0x [basic.lookup.argdep]p1). 2091 ADL = false; 2092 FnExpr = PExpr->getSubExpr(); 2093 } else if (isa<UnaryOperator>(FnExpr) && 2094 cast<UnaryOperator>(FnExpr)->getOpcode() 2095 == UnaryOperator::AddrOf) { 2096 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 2097 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 2098 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 2099 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 2100 break; 2101 } else if (UnresolvedFunctionNameExpr *DepName 2102 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 2103 UnqualifiedName = DepName->getName(); 2104 break; 2105 } else { 2106 // Any kind of name that does not refer to a declaration (or 2107 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 2108 ADL = false; 2109 break; 2110 } 2111 } 2112 2113 OverloadedFunctionDecl *Ovl = 0; 2114 if (DRExpr) { 2115 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 2116 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 2117 } 2118 2119 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 2120 // We don't perform ADL for implicit declarations of builtins. 2121 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 2122 ADL = false; 2123 2124 // We don't perform ADL in C. 2125 if (!getLangOptions().CPlusPlus) 2126 ADL = false; 2127 2128 if (Ovl || ADL) { 2129 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 2130 UnqualifiedName, LParenLoc, Args, 2131 NumArgs, CommaLocs, RParenLoc, ADL); 2132 if (!FDecl) 2133 return ExprError(); 2134 2135 // Update Fn to refer to the actual function selected. 2136 Expr *NewFn = 0; 2137 if (QualifiedDeclRefExpr *QDRExpr 2138 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 2139 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 2140 QDRExpr->getLocation(), 2141 false, false, 2142 QDRExpr->getSourceRange().getBegin()); 2143 else 2144 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 2145 Fn->getSourceRange().getBegin()); 2146 Fn->Destroy(Context); 2147 Fn = NewFn; 2148 } 2149 } 2150 2151 // Promote the function operand. 2152 UsualUnaryConversions(Fn); 2153 2154 // Make the call expr early, before semantic checks. This guarantees cleanup 2155 // of arguments and function on error. 2156 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 2157 Args, NumArgs, 2158 Context.BoolTy, 2159 RParenLoc)); 2160 2161 const FunctionType *FuncT; 2162 if (!Fn->getType()->isBlockPointerType()) { 2163 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 2164 // have type pointer to function". 2165 const PointerType *PT = Fn->getType()->getAsPointerType(); 2166 if (PT == 0) 2167 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2168 << Fn->getType() << Fn->getSourceRange()); 2169 FuncT = PT->getPointeeType()->getAsFunctionType(); 2170 } else { // This is a block call. 2171 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 2172 getAsFunctionType(); 2173 } 2174 if (FuncT == 0) 2175 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 2176 << Fn->getType() << Fn->getSourceRange()); 2177 2178 // We know the result type of the call, set it. 2179 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2180 2181 if (const FunctionProtoType *Proto = dyn_cast<FunctionProtoType>(FuncT)) { 2182 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2183 RParenLoc)) 2184 return ExprError(); 2185 } else { 2186 assert(isa<FunctionNoProtoType>(FuncT) && "Unknown FunctionType!"); 2187 2188 // Promote the arguments (C99 6.5.2.2p6). 2189 for (unsigned i = 0; i != NumArgs; i++) { 2190 Expr *Arg = Args[i]; 2191 DefaultArgumentPromotion(Arg); 2192 TheCall->setArg(i, Arg); 2193 } 2194 } 2195 2196 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2197 if (!Method->isStatic()) 2198 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2199 << Fn->getSourceRange()); 2200 2201 // Do special checking on direct calls to functions. 2202 if (FDecl) 2203 return CheckFunctionCall(FDecl, TheCall.take()); 2204 2205 return Owned(TheCall.take()); 2206} 2207 2208Action::OwningExprResult 2209Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2210 SourceLocation RParenLoc, ExprArg InitExpr) { 2211 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2212 QualType literalType = QualType::getFromOpaquePtr(Ty); 2213 // FIXME: put back this assert when initializers are worked out. 2214 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2215 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2216 2217 if (literalType->isArrayType()) { 2218 if (literalType->isVariableArrayType()) 2219 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2220 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2221 } else if (DiagnoseIncompleteType(LParenLoc, literalType, 2222 diag::err_typecheck_decl_incomplete_type, 2223 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2224 return ExprError(); 2225 2226 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2227 DeclarationName(), /*FIXME:DirectInit=*/false)) 2228 return ExprError(); 2229 2230 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2231 if (isFileScope) { // 6.5.2.5p3 2232 if (CheckForConstantInitializer(literalExpr, literalType)) 2233 return ExprError(); 2234 } 2235 InitExpr.release(); 2236 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2237 literalExpr, isFileScope)); 2238} 2239 2240Action::OwningExprResult 2241Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2242 InitListDesignations &Designators, 2243 SourceLocation RBraceLoc) { 2244 unsigned NumInit = initlist.size(); 2245 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2246 2247 // Semantic analysis for initializers is done by ActOnDeclarator() and 2248 // CheckInitializer() - it requires knowledge of the object being intialized. 2249 2250 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2251 RBraceLoc); 2252 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2253 return Owned(E); 2254} 2255 2256/// CheckCastTypes - Check type constraints for casting between types. 2257bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2258 UsualUnaryConversions(castExpr); 2259 2260 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2261 // type needs to be scalar. 2262 if (castType->isVoidType()) { 2263 // Cast to void allows any expr type. 2264 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2265 // We can't check any more until template instantiation time. 2266 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2267 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2268 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2269 (castType->isStructureType() || castType->isUnionType())) { 2270 // GCC struct/union extension: allow cast to self. 2271 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2272 << castType << castExpr->getSourceRange(); 2273 } else if (castType->isUnionType()) { 2274 // GCC cast to union extension 2275 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2276 RecordDecl::field_iterator Field, FieldEnd; 2277 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 2278 Field != FieldEnd; ++Field) { 2279 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2280 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2281 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2282 << castExpr->getSourceRange(); 2283 break; 2284 } 2285 } 2286 if (Field == FieldEnd) 2287 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2288 << castExpr->getType() << castExpr->getSourceRange(); 2289 } else { 2290 // Reject any other conversions to non-scalar types. 2291 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2292 << castType << castExpr->getSourceRange(); 2293 } 2294 } else if (!castExpr->getType()->isScalarType() && 2295 !castExpr->getType()->isVectorType()) { 2296 return Diag(castExpr->getLocStart(), 2297 diag::err_typecheck_expect_scalar_operand) 2298 << castExpr->getType() << castExpr->getSourceRange(); 2299 } else if (castExpr->getType()->isVectorType()) { 2300 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2301 return true; 2302 } else if (castType->isVectorType()) { 2303 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2304 return true; 2305 } 2306 return false; 2307} 2308 2309bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2310 assert(VectorTy->isVectorType() && "Not a vector type!"); 2311 2312 if (Ty->isVectorType() || Ty->isIntegerType()) { 2313 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2314 return Diag(R.getBegin(), 2315 Ty->isVectorType() ? 2316 diag::err_invalid_conversion_between_vectors : 2317 diag::err_invalid_conversion_between_vector_and_integer) 2318 << VectorTy << Ty << R; 2319 } else 2320 return Diag(R.getBegin(), 2321 diag::err_invalid_conversion_between_vector_and_scalar) 2322 << VectorTy << Ty << R; 2323 2324 return false; 2325} 2326 2327Action::OwningExprResult 2328Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2329 SourceLocation RParenLoc, ExprArg Op) { 2330 assert((Ty != 0) && (Op.get() != 0) && 2331 "ActOnCastExpr(): missing type or expr"); 2332 2333 Expr *castExpr = static_cast<Expr*>(Op.release()); 2334 QualType castType = QualType::getFromOpaquePtr(Ty); 2335 2336 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2337 return ExprError(); 2338 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2339 LParenLoc, RParenLoc)); 2340} 2341 2342/// Note that lhs is not null here, even if this is the gnu "x ?: y" extension. 2343/// In that case, lhs = cond. 2344/// C99 6.5.15 2345QualType Sema::CheckConditionalOperands(Expr *&Cond, Expr *&LHS, Expr *&RHS, 2346 SourceLocation QuestionLoc) { 2347 UsualUnaryConversions(Cond); 2348 UsualUnaryConversions(LHS); 2349 UsualUnaryConversions(RHS); 2350 QualType CondTy = Cond->getType(); 2351 QualType LHSTy = LHS->getType(); 2352 QualType RHSTy = RHS->getType(); 2353 2354 // first, check the condition. 2355 if (!Cond->isTypeDependent()) { 2356 if (!CondTy->isScalarType()) { // C99 6.5.15p2 2357 Diag(Cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) 2358 << CondTy; 2359 return QualType(); 2360 } 2361 } 2362 2363 // Now check the two expressions. 2364 if ((LHS && LHS->isTypeDependent()) || (RHS && RHS->isTypeDependent())) 2365 return Context.DependentTy; 2366 2367 // If both operands have arithmetic type, do the usual arithmetic conversions 2368 // to find a common type: C99 6.5.15p3,5. 2369 if (LHSTy->isArithmeticType() && RHSTy->isArithmeticType()) { 2370 UsualArithmeticConversions(LHS, RHS); 2371 return LHS->getType(); 2372 } 2373 2374 // If both operands are the same structure or union type, the result is that 2375 // type. 2376 if (const RecordType *LHSRT = LHSTy->getAsRecordType()) { // C99 6.5.15p3 2377 if (const RecordType *RHSRT = RHSTy->getAsRecordType()) 2378 if (LHSRT->getDecl() == RHSRT->getDecl()) 2379 // "If both the operands have structure or union type, the result has 2380 // that type." This implies that CV qualifiers are dropped. 2381 return LHSTy.getUnqualifiedType(); 2382 } 2383 2384 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2385 // The following || allows only one side to be void (a GCC-ism). 2386 if (LHSTy->isVoidType() || RHSTy->isVoidType()) { 2387 if (!LHSTy->isVoidType()) 2388 Diag(RHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2389 << RHS->getSourceRange(); 2390 if (!RHSTy->isVoidType()) 2391 Diag(LHS->getLocStart(), diag::ext_typecheck_cond_one_void) 2392 << LHS->getSourceRange(); 2393 ImpCastExprToType(LHS, Context.VoidTy); 2394 ImpCastExprToType(RHS, Context.VoidTy); 2395 return Context.VoidTy; 2396 } 2397 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2398 // the type of the other operand." 2399 if ((LHSTy->isPointerType() || LHSTy->isBlockPointerType() || 2400 Context.isObjCObjectPointerType(LHSTy)) && 2401 RHS->isNullPointerConstant(Context)) { 2402 ImpCastExprToType(RHS, LHSTy); // promote the null to a pointer. 2403 return LHSTy; 2404 } 2405 if ((RHSTy->isPointerType() || RHSTy->isBlockPointerType() || 2406 Context.isObjCObjectPointerType(RHSTy)) && 2407 LHS->isNullPointerConstant(Context)) { 2408 ImpCastExprToType(LHS, RHSTy); // promote the null to a pointer. 2409 return RHSTy; 2410 } 2411 2412 // Handle the case where both operands are pointers before we handle null 2413 // pointer constants in case both operands are null pointer constants. 2414 if (const PointerType *LHSPT = LHSTy->getAsPointerType()) { // C99 6.5.15p3,6 2415 if (const PointerType *RHSPT = RHSTy->getAsPointerType()) { 2416 // get the "pointed to" types 2417 QualType lhptee = LHSPT->getPointeeType(); 2418 QualType rhptee = RHSPT->getPointeeType(); 2419 2420 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2421 if (lhptee->isVoidType() && 2422 rhptee->isIncompleteOrObjectType()) { 2423 // Figure out necessary qualifiers (C99 6.5.15p6) 2424 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2425 QualType destType = Context.getPointerType(destPointee); 2426 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2427 ImpCastExprToType(RHS, destType); // promote to void* 2428 return destType; 2429 } 2430 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2431 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2432 QualType destType = Context.getPointerType(destPointee); 2433 ImpCastExprToType(LHS, destType); // add qualifiers if necessary 2434 ImpCastExprToType(RHS, destType); // promote to void* 2435 return destType; 2436 } 2437 2438 if (Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) { 2439 // Two identical pointer types are always compatible. 2440 return LHSTy; 2441 } 2442 2443 QualType compositeType = LHSTy; 2444 2445 // If either type is an Objective-C object type then check 2446 // compatibility according to Objective-C. 2447 if (Context.isObjCObjectPointerType(LHSTy) || 2448 Context.isObjCObjectPointerType(RHSTy)) { 2449 // If both operands are interfaces and either operand can be 2450 // assigned to the other, use that type as the composite 2451 // type. This allows 2452 // xxx ? (A*) a : (B*) b 2453 // where B is a subclass of A. 2454 // 2455 // Additionally, as for assignment, if either type is 'id' 2456 // allow silent coercion. Finally, if the types are 2457 // incompatible then make sure to use 'id' as the composite 2458 // type so the result is acceptable for sending messages to. 2459 2460 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2461 // It could return the composite type. 2462 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2463 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2464 if (LHSIface && RHSIface && 2465 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2466 compositeType = LHSTy; 2467 } else if (LHSIface && RHSIface && 2468 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2469 compositeType = RHSTy; 2470 } else if (Context.isObjCIdStructType(lhptee) || 2471 Context.isObjCIdStructType(rhptee)) { 2472 compositeType = Context.getObjCIdType(); 2473 } else { 2474 Diag(QuestionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2475 << LHSTy << RHSTy 2476 << LHS->getSourceRange() << RHS->getSourceRange(); 2477 QualType incompatTy = Context.getObjCIdType(); 2478 ImpCastExprToType(LHS, incompatTy); 2479 ImpCastExprToType(RHS, incompatTy); 2480 return incompatTy; 2481 } 2482 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2483 rhptee.getUnqualifiedType())) { 2484 Diag(QuestionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2485 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2486 // In this situation, we assume void* type. No especially good 2487 // reason, but this is what gcc does, and we do have to pick 2488 // to get a consistent AST. 2489 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2490 ImpCastExprToType(LHS, incompatTy); 2491 ImpCastExprToType(RHS, incompatTy); 2492 return incompatTy; 2493 } 2494 // The pointer types are compatible. 2495 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2496 // differently qualified versions of compatible types, the result type is 2497 // a pointer to an appropriately qualified version of the *composite* 2498 // type. 2499 // FIXME: Need to calculate the composite type. 2500 // FIXME: Need to add qualifiers 2501 ImpCastExprToType(LHS, compositeType); 2502 ImpCastExprToType(RHS, compositeType); 2503 return compositeType; 2504 } 2505 } 2506 2507 // Selection between block pointer types is ok as long as they are the same. 2508 if (LHSTy->isBlockPointerType() && RHSTy->isBlockPointerType() && 2509 Context.getCanonicalType(LHSTy) == Context.getCanonicalType(RHSTy)) 2510 return LHSTy; 2511 2512 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2513 // evaluates to "struct objc_object *" (and is handled above when comparing 2514 // id with statically typed objects). 2515 if (LHSTy->isObjCQualifiedIdType() || RHSTy->isObjCQualifiedIdType()) { 2516 // GCC allows qualified id and any Objective-C type to devolve to 2517 // id. Currently localizing to here until clear this should be 2518 // part of ObjCQualifiedIdTypesAreCompatible. 2519 if (ObjCQualifiedIdTypesAreCompatible(LHSTy, RHSTy, true) || 2520 (LHSTy->isObjCQualifiedIdType() && 2521 Context.isObjCObjectPointerType(RHSTy)) || 2522 (RHSTy->isObjCQualifiedIdType() && 2523 Context.isObjCObjectPointerType(LHSTy))) { 2524 // FIXME: This is not the correct composite type. This only 2525 // happens to work because id can more or less be used anywhere, 2526 // however this may change the type of method sends. 2527 // FIXME: gcc adds some type-checking of the arguments and emits 2528 // (confusing) incompatible comparison warnings in some 2529 // cases. Investigate. 2530 QualType compositeType = Context.getObjCIdType(); 2531 ImpCastExprToType(LHS, compositeType); 2532 ImpCastExprToType(RHS, compositeType); 2533 return compositeType; 2534 } 2535 } 2536 2537 // Otherwise, the operands are not compatible. 2538 Diag(QuestionLoc, diag::err_typecheck_cond_incompatible_operands) 2539 << LHSTy << RHSTy << LHS->getSourceRange() << RHS->getSourceRange(); 2540 return QualType(); 2541} 2542 2543/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2544/// in the case of a the GNU conditional expr extension. 2545Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2546 SourceLocation ColonLoc, 2547 ExprArg Cond, ExprArg LHS, 2548 ExprArg RHS) { 2549 Expr *CondExpr = (Expr *) Cond.get(); 2550 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2551 2552 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2553 // was the condition. 2554 bool isLHSNull = LHSExpr == 0; 2555 if (isLHSNull) 2556 LHSExpr = CondExpr; 2557 2558 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2559 RHSExpr, QuestionLoc); 2560 if (result.isNull()) 2561 return ExprError(); 2562 2563 Cond.release(); 2564 LHS.release(); 2565 RHS.release(); 2566 return Owned(new (Context) ConditionalOperator(CondExpr, 2567 isLHSNull ? 0 : LHSExpr, 2568 RHSExpr, result)); 2569} 2570 2571 2572// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2573// being closely modeled after the C99 spec:-). The odd characteristic of this 2574// routine is it effectively iqnores the qualifiers on the top level pointee. 2575// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2576// FIXME: add a couple examples in this comment. 2577Sema::AssignConvertType 2578Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2579 QualType lhptee, rhptee; 2580 2581 // get the "pointed to" type (ignoring qualifiers at the top level) 2582 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2583 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2584 2585 // make sure we operate on the canonical type 2586 lhptee = Context.getCanonicalType(lhptee); 2587 rhptee = Context.getCanonicalType(rhptee); 2588 2589 AssignConvertType ConvTy = Compatible; 2590 2591 // C99 6.5.16.1p1: This following citation is common to constraints 2592 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2593 // qualifiers of the type *pointed to* by the right; 2594 // FIXME: Handle ExtQualType 2595 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2596 ConvTy = CompatiblePointerDiscardsQualifiers; 2597 2598 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2599 // incomplete type and the other is a pointer to a qualified or unqualified 2600 // version of void... 2601 if (lhptee->isVoidType()) { 2602 if (rhptee->isIncompleteOrObjectType()) 2603 return ConvTy; 2604 2605 // As an extension, we allow cast to/from void* to function pointer. 2606 assert(rhptee->isFunctionType()); 2607 return FunctionVoidPointer; 2608 } 2609 2610 if (rhptee->isVoidType()) { 2611 if (lhptee->isIncompleteOrObjectType()) 2612 return ConvTy; 2613 2614 // As an extension, we allow cast to/from void* to function pointer. 2615 assert(lhptee->isFunctionType()); 2616 return FunctionVoidPointer; 2617 } 2618 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2619 // unqualified versions of compatible types, ... 2620 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2621 rhptee.getUnqualifiedType())) 2622 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 2623 return ConvTy; 2624} 2625 2626/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2627/// block pointer types are compatible or whether a block and normal pointer 2628/// are compatible. It is more restrict than comparing two function pointer 2629// types. 2630Sema::AssignConvertType 2631Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2632 QualType rhsType) { 2633 QualType lhptee, rhptee; 2634 2635 // get the "pointed to" type (ignoring qualifiers at the top level) 2636 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2637 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2638 2639 // make sure we operate on the canonical type 2640 lhptee = Context.getCanonicalType(lhptee); 2641 rhptee = Context.getCanonicalType(rhptee); 2642 2643 AssignConvertType ConvTy = Compatible; 2644 2645 // For blocks we enforce that qualifiers are identical. 2646 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2647 ConvTy = CompatiblePointerDiscardsQualifiers; 2648 2649 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2650 return IncompatibleBlockPointer; 2651 return ConvTy; 2652} 2653 2654/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2655/// has code to accommodate several GCC extensions when type checking 2656/// pointers. Here are some objectionable examples that GCC considers warnings: 2657/// 2658/// int a, *pint; 2659/// short *pshort; 2660/// struct foo *pfoo; 2661/// 2662/// pint = pshort; // warning: assignment from incompatible pointer type 2663/// a = pint; // warning: assignment makes integer from pointer without a cast 2664/// pint = a; // warning: assignment makes pointer from integer without a cast 2665/// pint = pfoo; // warning: assignment from incompatible pointer type 2666/// 2667/// As a result, the code for dealing with pointers is more complex than the 2668/// C99 spec dictates. 2669/// 2670Sema::AssignConvertType 2671Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2672 // Get canonical types. We're not formatting these types, just comparing 2673 // them. 2674 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2675 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2676 2677 if (lhsType == rhsType) 2678 return Compatible; // Common case: fast path an exact match. 2679 2680 // If the left-hand side is a reference type, then we are in a 2681 // (rare!) case where we've allowed the use of references in C, 2682 // e.g., as a parameter type in a built-in function. In this case, 2683 // just make sure that the type referenced is compatible with the 2684 // right-hand side type. The caller is responsible for adjusting 2685 // lhsType so that the resulting expression does not have reference 2686 // type. 2687 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2688 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2689 return Compatible; 2690 return Incompatible; 2691 } 2692 2693 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 2694 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 2695 return Compatible; 2696 // Relax integer conversions like we do for pointers below. 2697 if (rhsType->isIntegerType()) 2698 return IntToPointer; 2699 if (lhsType->isIntegerType()) 2700 return PointerToInt; 2701 return IncompatibleObjCQualifiedId; 2702 } 2703 2704 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2705 // For ExtVector, allow vector splats; float -> <n x float> 2706 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2707 if (LV->getElementType() == rhsType) 2708 return Compatible; 2709 2710 // If we are allowing lax vector conversions, and LHS and RHS are both 2711 // vectors, the total size only needs to be the same. This is a bitcast; 2712 // no bits are changed but the result type is different. 2713 if (getLangOptions().LaxVectorConversions && 2714 lhsType->isVectorType() && rhsType->isVectorType()) { 2715 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2716 return IncompatibleVectors; 2717 } 2718 return Incompatible; 2719 } 2720 2721 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2722 return Compatible; 2723 2724 if (isa<PointerType>(lhsType)) { 2725 if (rhsType->isIntegerType()) 2726 return IntToPointer; 2727 2728 if (isa<PointerType>(rhsType)) 2729 return CheckPointerTypesForAssignment(lhsType, rhsType); 2730 2731 if (rhsType->getAsBlockPointerType()) { 2732 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2733 return Compatible; 2734 2735 // Treat block pointers as objects. 2736 if (getLangOptions().ObjC1 && 2737 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2738 return Compatible; 2739 } 2740 return Incompatible; 2741 } 2742 2743 if (isa<BlockPointerType>(lhsType)) { 2744 if (rhsType->isIntegerType()) 2745 return IntToBlockPointer; 2746 2747 // Treat block pointers as objects. 2748 if (getLangOptions().ObjC1 && 2749 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2750 return Compatible; 2751 2752 if (rhsType->isBlockPointerType()) 2753 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2754 2755 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2756 if (RHSPT->getPointeeType()->isVoidType()) 2757 return Compatible; 2758 } 2759 return Incompatible; 2760 } 2761 2762 if (isa<PointerType>(rhsType)) { 2763 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2764 if (lhsType == Context.BoolTy) 2765 return Compatible; 2766 2767 if (lhsType->isIntegerType()) 2768 return PointerToInt; 2769 2770 if (isa<PointerType>(lhsType)) 2771 return CheckPointerTypesForAssignment(lhsType, rhsType); 2772 2773 if (isa<BlockPointerType>(lhsType) && 2774 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2775 return Compatible; 2776 return Incompatible; 2777 } 2778 2779 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 2780 if (Context.typesAreCompatible(lhsType, rhsType)) 2781 return Compatible; 2782 } 2783 return Incompatible; 2784} 2785 2786Sema::AssignConvertType 2787Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2788 if (getLangOptions().CPlusPlus) { 2789 if (!lhsType->isRecordType()) { 2790 // C++ 5.17p3: If the left operand is not of class type, the 2791 // expression is implicitly converted (C++ 4) to the 2792 // cv-unqualified type of the left operand. 2793 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 2794 "assigning")) 2795 return Incompatible; 2796 else 2797 return Compatible; 2798 } 2799 2800 // FIXME: Currently, we fall through and treat C++ classes like C 2801 // structures. 2802 } 2803 2804 // C99 6.5.16.1p1: the left operand is a pointer and the right is 2805 // a null pointer constant. 2806 if ((lhsType->isPointerType() || 2807 lhsType->isObjCQualifiedIdType() || 2808 lhsType->isBlockPointerType()) 2809 && rExpr->isNullPointerConstant(Context)) { 2810 ImpCastExprToType(rExpr, lhsType); 2811 return Compatible; 2812 } 2813 2814 // This check seems unnatural, however it is necessary to ensure the proper 2815 // conversion of functions/arrays. If the conversion were done for all 2816 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 2817 // expressions that surpress this implicit conversion (&, sizeof). 2818 // 2819 // Suppress this for references: C++ 8.5.3p5. 2820 if (!lhsType->isReferenceType()) 2821 DefaultFunctionArrayConversion(rExpr); 2822 2823 Sema::AssignConvertType result = 2824 CheckAssignmentConstraints(lhsType, rExpr->getType()); 2825 2826 // C99 6.5.16.1p2: The value of the right operand is converted to the 2827 // type of the assignment expression. 2828 // CheckAssignmentConstraints allows the left-hand side to be a reference, 2829 // so that we can use references in built-in functions even in C. 2830 // The getNonReferenceType() call makes sure that the resulting expression 2831 // does not have reference type. 2832 if (rExpr->getType() != lhsType) 2833 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 2834 return result; 2835} 2836 2837Sema::AssignConvertType 2838Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 2839 return CheckAssignmentConstraints(lhsType, rhsType); 2840} 2841 2842QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 2843 Diag(Loc, diag::err_typecheck_invalid_operands) 2844 << lex->getType() << rex->getType() 2845 << lex->getSourceRange() << rex->getSourceRange(); 2846 return QualType(); 2847} 2848 2849inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 2850 Expr *&rex) { 2851 // For conversion purposes, we ignore any qualifiers. 2852 // For example, "const float" and "float" are equivalent. 2853 QualType lhsType = 2854 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 2855 QualType rhsType = 2856 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 2857 2858 // If the vector types are identical, return. 2859 if (lhsType == rhsType) 2860 return lhsType; 2861 2862 // Handle the case of a vector & extvector type of the same size and element 2863 // type. It would be nice if we only had one vector type someday. 2864 if (getLangOptions().LaxVectorConversions) { 2865 // FIXME: Should we warn here? 2866 if (const VectorType *LV = lhsType->getAsVectorType()) { 2867 if (const VectorType *RV = rhsType->getAsVectorType()) 2868 if (LV->getElementType() == RV->getElementType() && 2869 LV->getNumElements() == RV->getNumElements()) { 2870 return lhsType->isExtVectorType() ? lhsType : rhsType; 2871 } 2872 } 2873 } 2874 2875 // If the lhs is an extended vector and the rhs is a scalar of the same type 2876 // or a literal, promote the rhs to the vector type. 2877 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 2878 QualType eltType = V->getElementType(); 2879 2880 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 2881 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 2882 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 2883 ImpCastExprToType(rex, lhsType); 2884 return lhsType; 2885 } 2886 } 2887 2888 // If the rhs is an extended vector and the lhs is a scalar of the same type, 2889 // promote the lhs to the vector type. 2890 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 2891 QualType eltType = V->getElementType(); 2892 2893 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 2894 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 2895 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 2896 ImpCastExprToType(lex, rhsType); 2897 return rhsType; 2898 } 2899 } 2900 2901 // You cannot convert between vector values of different size. 2902 Diag(Loc, diag::err_typecheck_vector_not_convertable) 2903 << lex->getType() << rex->getType() 2904 << lex->getSourceRange() << rex->getSourceRange(); 2905 return QualType(); 2906} 2907 2908inline QualType Sema::CheckMultiplyDivideOperands( 2909 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2910{ 2911 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2912 return CheckVectorOperands(Loc, lex, rex); 2913 2914 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2915 2916 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2917 return compType; 2918 return InvalidOperands(Loc, lex, rex); 2919} 2920 2921inline QualType Sema::CheckRemainderOperands( 2922 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2923{ 2924 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 2925 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2926 return CheckVectorOperands(Loc, lex, rex); 2927 return InvalidOperands(Loc, lex, rex); 2928 } 2929 2930 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2931 2932 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2933 return compType; 2934 return InvalidOperands(Loc, lex, rex); 2935} 2936 2937inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 2938 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2939{ 2940 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2941 return CheckVectorOperands(Loc, lex, rex); 2942 2943 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2944 2945 // handle the common case first (both operands are arithmetic). 2946 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2947 return compType; 2948 2949 // Put any potential pointer into PExp 2950 Expr* PExp = lex, *IExp = rex; 2951 if (IExp->getType()->isPointerType()) 2952 std::swap(PExp, IExp); 2953 2954 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 2955 if (IExp->getType()->isIntegerType()) { 2956 // Check for arithmetic on pointers to incomplete types 2957 if (!PTy->getPointeeType()->isObjectType()) { 2958 if (PTy->getPointeeType()->isVoidType()) { 2959 if (getLangOptions().CPlusPlus) { 2960 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 2961 << lex->getSourceRange() << rex->getSourceRange(); 2962 return QualType(); 2963 } 2964 2965 // GNU extension: arithmetic on pointer to void 2966 Diag(Loc, diag::ext_gnu_void_ptr) 2967 << lex->getSourceRange() << rex->getSourceRange(); 2968 } else if (PTy->getPointeeType()->isFunctionType()) { 2969 if (getLangOptions().CPlusPlus) { 2970 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 2971 << lex->getType() << lex->getSourceRange(); 2972 return QualType(); 2973 } 2974 2975 // GNU extension: arithmetic on pointer to function 2976 Diag(Loc, diag::ext_gnu_ptr_func_arith) 2977 << lex->getType() << lex->getSourceRange(); 2978 } else { 2979 DiagnoseIncompleteType(Loc, PTy->getPointeeType(), 2980 diag::err_typecheck_arithmetic_incomplete_type, 2981 lex->getSourceRange(), SourceRange(), 2982 lex->getType()); 2983 return QualType(); 2984 } 2985 } 2986 return PExp->getType(); 2987 } 2988 } 2989 2990 return InvalidOperands(Loc, lex, rex); 2991} 2992 2993// C99 6.5.6 2994QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 2995 SourceLocation Loc, bool isCompAssign) { 2996 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2997 return CheckVectorOperands(Loc, lex, rex); 2998 2999 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3000 3001 // Enforce type constraints: C99 6.5.6p3. 3002 3003 // Handle the common case first (both operands are arithmetic). 3004 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3005 return compType; 3006 3007 // Either ptr - int or ptr - ptr. 3008 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 3009 QualType lpointee = LHSPTy->getPointeeType(); 3010 3011 // The LHS must be an object type, not incomplete, function, etc. 3012 if (!lpointee->isObjectType()) { 3013 // Handle the GNU void* extension. 3014 if (lpointee->isVoidType()) { 3015 Diag(Loc, diag::ext_gnu_void_ptr) 3016 << lex->getSourceRange() << rex->getSourceRange(); 3017 } else if (lpointee->isFunctionType()) { 3018 if (getLangOptions().CPlusPlus) { 3019 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3020 << lex->getType() << lex->getSourceRange(); 3021 return QualType(); 3022 } 3023 3024 // GNU extension: arithmetic on pointer to function 3025 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3026 << lex->getType() << lex->getSourceRange(); 3027 } else { 3028 Diag(Loc, diag::err_typecheck_sub_ptr_object) 3029 << lex->getType() << lex->getSourceRange(); 3030 return QualType(); 3031 } 3032 } 3033 3034 // The result type of a pointer-int computation is the pointer type. 3035 if (rex->getType()->isIntegerType()) 3036 return lex->getType(); 3037 3038 // Handle pointer-pointer subtractions. 3039 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 3040 QualType rpointee = RHSPTy->getPointeeType(); 3041 3042 // RHS must be an object type, unless void (GNU). 3043 if (!rpointee->isObjectType()) { 3044 // Handle the GNU void* extension. 3045 if (rpointee->isVoidType()) { 3046 if (!lpointee->isVoidType()) 3047 Diag(Loc, diag::ext_gnu_void_ptr) 3048 << lex->getSourceRange() << rex->getSourceRange(); 3049 } else if (rpointee->isFunctionType()) { 3050 if (getLangOptions().CPlusPlus) { 3051 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 3052 << rex->getType() << rex->getSourceRange(); 3053 return QualType(); 3054 } 3055 3056 // GNU extension: arithmetic on pointer to function 3057 if (!lpointee->isFunctionType()) 3058 Diag(Loc, diag::ext_gnu_ptr_func_arith) 3059 << lex->getType() << lex->getSourceRange(); 3060 } else { 3061 Diag(Loc, diag::err_typecheck_sub_ptr_object) 3062 << rex->getType() << rex->getSourceRange(); 3063 return QualType(); 3064 } 3065 } 3066 3067 // Pointee types must be compatible. 3068 if (!Context.typesAreCompatible( 3069 Context.getCanonicalType(lpointee).getUnqualifiedType(), 3070 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 3071 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 3072 << lex->getType() << rex->getType() 3073 << lex->getSourceRange() << rex->getSourceRange(); 3074 return QualType(); 3075 } 3076 3077 return Context.getPointerDiffType(); 3078 } 3079 } 3080 3081 return InvalidOperands(Loc, lex, rex); 3082} 3083 3084// C99 6.5.7 3085QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3086 bool isCompAssign) { 3087 // C99 6.5.7p2: Each of the operands shall have integer type. 3088 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 3089 return InvalidOperands(Loc, lex, rex); 3090 3091 // Shifts don't perform usual arithmetic conversions, they just do integer 3092 // promotions on each operand. C99 6.5.7p3 3093 if (!isCompAssign) 3094 UsualUnaryConversions(lex); 3095 UsualUnaryConversions(rex); 3096 3097 // "The type of the result is that of the promoted left operand." 3098 return lex->getType(); 3099} 3100 3101// C99 6.5.8 3102QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 3103 bool isRelational) { 3104 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3105 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 3106 3107 // C99 6.5.8p3 / C99 6.5.9p4 3108 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 3109 UsualArithmeticConversions(lex, rex); 3110 else { 3111 UsualUnaryConversions(lex); 3112 UsualUnaryConversions(rex); 3113 } 3114 QualType lType = lex->getType(); 3115 QualType rType = rex->getType(); 3116 3117 // For non-floating point types, check for self-comparisons of the form 3118 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3119 // often indicate logic errors in the program. 3120 if (!lType->isFloatingType()) { 3121 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3122 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3123 if (DRL->getDecl() == DRR->getDecl()) 3124 Diag(Loc, diag::warn_selfcomparison); 3125 } 3126 3127 // The result of comparisons is 'bool' in C++, 'int' in C. 3128 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy : Context.IntTy; 3129 3130 if (isRelational) { 3131 if (lType->isRealType() && rType->isRealType()) 3132 return ResultTy; 3133 } else { 3134 // Check for comparisons of floating point operands using != and ==. 3135 if (lType->isFloatingType()) { 3136 assert (rType->isFloatingType()); 3137 CheckFloatComparison(Loc,lex,rex); 3138 } 3139 3140 if (lType->isArithmeticType() && rType->isArithmeticType()) 3141 return ResultTy; 3142 } 3143 3144 bool LHSIsNull = lex->isNullPointerConstant(Context); 3145 bool RHSIsNull = rex->isNullPointerConstant(Context); 3146 3147 // All of the following pointer related warnings are GCC extensions, except 3148 // when handling null pointer constants. One day, we can consider making them 3149 // errors (when -pedantic-errors is enabled). 3150 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 3151 QualType LCanPointeeTy = 3152 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 3153 QualType RCanPointeeTy = 3154 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 3155 3156 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 3157 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 3158 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 3159 RCanPointeeTy.getUnqualifiedType()) && 3160 !Context.areComparableObjCPointerTypes(lType, rType)) { 3161 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3162 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3163 } 3164 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3165 return ResultTy; 3166 } 3167 // Handle block pointer types. 3168 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 3169 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 3170 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 3171 3172 if (!LHSIsNull && !RHSIsNull && 3173 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3174 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3175 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3176 } 3177 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3178 return ResultTy; 3179 } 3180 // Allow block pointers to be compared with null pointer constants. 3181 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3182 (lType->isPointerType() && rType->isBlockPointerType())) { 3183 if (!LHSIsNull && !RHSIsNull) { 3184 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3185 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3186 } 3187 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3188 return ResultTy; 3189 } 3190 3191 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3192 if (lType->isPointerType() || rType->isPointerType()) { 3193 const PointerType *LPT = lType->getAsPointerType(); 3194 const PointerType *RPT = rType->getAsPointerType(); 3195 bool LPtrToVoid = LPT ? 3196 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3197 bool RPtrToVoid = RPT ? 3198 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3199 3200 if (!LPtrToVoid && !RPtrToVoid && 3201 !Context.typesAreCompatible(lType, rType)) { 3202 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3203 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3204 ImpCastExprToType(rex, lType); 3205 return ResultTy; 3206 } 3207 ImpCastExprToType(rex, lType); 3208 return ResultTy; 3209 } 3210 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3211 ImpCastExprToType(rex, lType); 3212 return ResultTy; 3213 } else { 3214 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3215 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3216 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3217 ImpCastExprToType(rex, lType); 3218 return ResultTy; 3219 } 3220 } 3221 } 3222 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3223 rType->isIntegerType()) { 3224 if (!RHSIsNull) 3225 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3226 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3227 ImpCastExprToType(rex, lType); // promote the integer to pointer 3228 return ResultTy; 3229 } 3230 if (lType->isIntegerType() && 3231 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3232 if (!LHSIsNull) 3233 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3234 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3235 ImpCastExprToType(lex, rType); // promote the integer to pointer 3236 return ResultTy; 3237 } 3238 // Handle block pointers. 3239 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3240 if (!RHSIsNull) 3241 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3242 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3243 ImpCastExprToType(rex, lType); // promote the integer to pointer 3244 return ResultTy; 3245 } 3246 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3247 if (!LHSIsNull) 3248 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3249 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3250 ImpCastExprToType(lex, rType); // promote the integer to pointer 3251 return ResultTy; 3252 } 3253 return InvalidOperands(Loc, lex, rex); 3254} 3255 3256/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3257/// operates on extended vector types. Instead of producing an IntTy result, 3258/// like a scalar comparison, a vector comparison produces a vector of integer 3259/// types. 3260QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3261 SourceLocation Loc, 3262 bool isRelational) { 3263 // Check to make sure we're operating on vectors of the same type and width, 3264 // Allowing one side to be a scalar of element type. 3265 QualType vType = CheckVectorOperands(Loc, lex, rex); 3266 if (vType.isNull()) 3267 return vType; 3268 3269 QualType lType = lex->getType(); 3270 QualType rType = rex->getType(); 3271 3272 // For non-floating point types, check for self-comparisons of the form 3273 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3274 // often indicate logic errors in the program. 3275 if (!lType->isFloatingType()) { 3276 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3277 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3278 if (DRL->getDecl() == DRR->getDecl()) 3279 Diag(Loc, diag::warn_selfcomparison); 3280 } 3281 3282 // Check for comparisons of floating point operands using != and ==. 3283 if (!isRelational && lType->isFloatingType()) { 3284 assert (rType->isFloatingType()); 3285 CheckFloatComparison(Loc,lex,rex); 3286 } 3287 3288 // Return the type for the comparison, which is the same as vector type for 3289 // integer vectors, or an integer type of identical size and number of 3290 // elements for floating point vectors. 3291 if (lType->isIntegerType()) 3292 return lType; 3293 3294 const VectorType *VTy = lType->getAsVectorType(); 3295 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3296 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3297 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3298 else if (TypeSize == Context.getTypeSize(Context.LongTy)) 3299 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3300 3301 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3302 "Unhandled vector element size in vector compare"); 3303 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3304} 3305 3306inline QualType Sema::CheckBitwiseOperands( 3307 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3308{ 3309 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3310 return CheckVectorOperands(Loc, lex, rex); 3311 3312 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3313 3314 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3315 return compType; 3316 return InvalidOperands(Loc, lex, rex); 3317} 3318 3319inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3320 Expr *&lex, Expr *&rex, SourceLocation Loc) 3321{ 3322 UsualUnaryConversions(lex); 3323 UsualUnaryConversions(rex); 3324 3325 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3326 return Context.IntTy; 3327 return InvalidOperands(Loc, lex, rex); 3328} 3329 3330/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3331/// is a read-only property; return true if so. A readonly property expression 3332/// depends on various declarations and thus must be treated specially. 3333/// 3334static bool IsReadonlyProperty(Expr *E, Sema &S) 3335{ 3336 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3337 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3338 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3339 QualType BaseType = PropExpr->getBase()->getType(); 3340 if (const PointerType *PTy = BaseType->getAsPointerType()) 3341 if (const ObjCInterfaceType *IFTy = 3342 PTy->getPointeeType()->getAsObjCInterfaceType()) 3343 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3344 if (S.isPropertyReadonly(PDecl, IFace)) 3345 return true; 3346 } 3347 } 3348 return false; 3349} 3350 3351/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3352/// emit an error and return true. If so, return false. 3353static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3354 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 3355 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3356 IsLV = Expr::MLV_ReadonlyProperty; 3357 if (IsLV == Expr::MLV_Valid) 3358 return false; 3359 3360 unsigned Diag = 0; 3361 bool NeedType = false; 3362 switch (IsLV) { // C99 6.5.16p2 3363 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3364 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3365 case Expr::MLV_ArrayType: 3366 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3367 NeedType = true; 3368 break; 3369 case Expr::MLV_NotObjectType: 3370 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3371 NeedType = true; 3372 break; 3373 case Expr::MLV_LValueCast: 3374 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3375 break; 3376 case Expr::MLV_InvalidExpression: 3377 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3378 break; 3379 case Expr::MLV_IncompleteType: 3380 case Expr::MLV_IncompleteVoidType: 3381 return S.DiagnoseIncompleteType(Loc, E->getType(), 3382 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3383 E->getSourceRange()); 3384 case Expr::MLV_DuplicateVectorComponents: 3385 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 3386 break; 3387 case Expr::MLV_NotBlockQualified: 3388 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 3389 break; 3390 case Expr::MLV_ReadonlyProperty: 3391 Diag = diag::error_readonly_property_assignment; 3392 break; 3393 case Expr::MLV_NoSetterProperty: 3394 Diag = diag::error_nosetter_property_assignment; 3395 break; 3396 } 3397 3398 if (NeedType) 3399 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 3400 else 3401 S.Diag(Loc, Diag) << E->getSourceRange(); 3402 return true; 3403} 3404 3405 3406 3407// C99 6.5.16.1 3408QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 3409 SourceLocation Loc, 3410 QualType CompoundType) { 3411 // Verify that LHS is a modifiable lvalue, and emit error if not. 3412 if (CheckForModifiableLvalue(LHS, Loc, *this)) 3413 return QualType(); 3414 3415 QualType LHSType = LHS->getType(); 3416 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 3417 3418 AssignConvertType ConvTy; 3419 if (CompoundType.isNull()) { 3420 // Simple assignment "x = y". 3421 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 3422 // Special case of NSObject attributes on c-style pointer types. 3423 if (ConvTy == IncompatiblePointer && 3424 ((Context.isObjCNSObjectType(LHSType) && 3425 Context.isObjCObjectPointerType(RHSType)) || 3426 (Context.isObjCNSObjectType(RHSType) && 3427 Context.isObjCObjectPointerType(LHSType)))) 3428 ConvTy = Compatible; 3429 3430 // If the RHS is a unary plus or minus, check to see if they = and + are 3431 // right next to each other. If so, the user may have typo'd "x =+ 4" 3432 // instead of "x += 4". 3433 Expr *RHSCheck = RHS; 3434 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 3435 RHSCheck = ICE->getSubExpr(); 3436 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 3437 if ((UO->getOpcode() == UnaryOperator::Plus || 3438 UO->getOpcode() == UnaryOperator::Minus) && 3439 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 3440 // Only if the two operators are exactly adjacent. 3441 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 3442 Diag(Loc, diag::warn_not_compound_assign) 3443 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 3444 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 3445 } 3446 } else { 3447 // Compound assignment "x += y" 3448 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 3449 } 3450 3451 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 3452 RHS, "assigning")) 3453 return QualType(); 3454 3455 // C99 6.5.16p3: The type of an assignment expression is the type of the 3456 // left operand unless the left operand has qualified type, in which case 3457 // it is the unqualified version of the type of the left operand. 3458 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 3459 // is converted to the type of the assignment expression (above). 3460 // C++ 5.17p1: the type of the assignment expression is that of its left 3461 // oprdu. 3462 return LHSType.getUnqualifiedType(); 3463} 3464 3465// C99 6.5.17 3466QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 3467 // FIXME: what is required for LHS? 3468 3469 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 3470 DefaultFunctionArrayConversion(RHS); 3471 return RHS->getType(); 3472} 3473 3474/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 3475/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 3476QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 3477 bool isInc) { 3478 if (Op->isTypeDependent()) 3479 return Context.DependentTy; 3480 3481 QualType ResType = Op->getType(); 3482 assert(!ResType.isNull() && "no type for increment/decrement expression"); 3483 3484 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 3485 // Decrement of bool is not allowed. 3486 if (!isInc) { 3487 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 3488 return QualType(); 3489 } 3490 // Increment of bool sets it to true, but is deprecated. 3491 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 3492 } else if (ResType->isRealType()) { 3493 // OK! 3494 } else if (const PointerType *PT = ResType->getAsPointerType()) { 3495 // C99 6.5.2.4p2, 6.5.6p2 3496 if (PT->getPointeeType()->isObjectType()) { 3497 // Pointer to object is ok! 3498 } else if (PT->getPointeeType()->isVoidType()) { 3499 if (getLangOptions().CPlusPlus) { 3500 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 3501 << Op->getSourceRange(); 3502 return QualType(); 3503 } 3504 3505 // Pointer to void is a GNU extension in C. 3506 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 3507 } else if (PT->getPointeeType()->isFunctionType()) { 3508 if (getLangOptions().CPlusPlus) { 3509 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 3510 << Op->getType() << Op->getSourceRange(); 3511 return QualType(); 3512 } 3513 3514 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 3515 << ResType << Op->getSourceRange(); 3516 return QualType(); 3517 } else { 3518 DiagnoseIncompleteType(OpLoc, PT->getPointeeType(), 3519 diag::err_typecheck_arithmetic_incomplete_type, 3520 Op->getSourceRange(), SourceRange(), 3521 ResType); 3522 return QualType(); 3523 } 3524 } else if (ResType->isComplexType()) { 3525 // C99 does not support ++/-- on complex types, we allow as an extension. 3526 Diag(OpLoc, diag::ext_integer_increment_complex) 3527 << ResType << Op->getSourceRange(); 3528 } else { 3529 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 3530 << ResType << Op->getSourceRange(); 3531 return QualType(); 3532 } 3533 // At this point, we know we have a real, complex or pointer type. 3534 // Now make sure the operand is a modifiable lvalue. 3535 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 3536 return QualType(); 3537 return ResType; 3538} 3539 3540/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 3541/// This routine allows us to typecheck complex/recursive expressions 3542/// where the declaration is needed for type checking. We only need to 3543/// handle cases when the expression references a function designator 3544/// or is an lvalue. Here are some examples: 3545/// - &(x) => x 3546/// - &*****f => f for f a function designator. 3547/// - &s.xx => s 3548/// - &s.zz[1].yy -> s, if zz is an array 3549/// - *(x + 1) -> x, if x is an array 3550/// - &"123"[2] -> 0 3551/// - & __real__ x -> x 3552static NamedDecl *getPrimaryDecl(Expr *E) { 3553 switch (E->getStmtClass()) { 3554 case Stmt::DeclRefExprClass: 3555 case Stmt::QualifiedDeclRefExprClass: 3556 return cast<DeclRefExpr>(E)->getDecl(); 3557 case Stmt::MemberExprClass: 3558 // Fields cannot be declared with a 'register' storage class. 3559 // &X->f is always ok, even if X is declared register. 3560 if (cast<MemberExpr>(E)->isArrow()) 3561 return 0; 3562 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 3563 case Stmt::ArraySubscriptExprClass: { 3564 // &X[4] and &4[X] refers to X if X is not a pointer. 3565 3566 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 3567 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 3568 if (!VD || VD->getType()->isPointerType()) 3569 return 0; 3570 else 3571 return VD; 3572 } 3573 case Stmt::UnaryOperatorClass: { 3574 UnaryOperator *UO = cast<UnaryOperator>(E); 3575 3576 switch(UO->getOpcode()) { 3577 case UnaryOperator::Deref: { 3578 // *(X + 1) refers to X if X is not a pointer. 3579 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 3580 ValueDecl *VD = dyn_cast<ValueDecl>(D); 3581 if (!VD || VD->getType()->isPointerType()) 3582 return 0; 3583 return VD; 3584 } 3585 return 0; 3586 } 3587 case UnaryOperator::Real: 3588 case UnaryOperator::Imag: 3589 case UnaryOperator::Extension: 3590 return getPrimaryDecl(UO->getSubExpr()); 3591 default: 3592 return 0; 3593 } 3594 } 3595 case Stmt::BinaryOperatorClass: { 3596 BinaryOperator *BO = cast<BinaryOperator>(E); 3597 3598 // Handle cases involving pointer arithmetic. The result of an 3599 // Assign or AddAssign is not an lvalue so they can be ignored. 3600 3601 // (x + n) or (n + x) => x 3602 if (BO->getOpcode() == BinaryOperator::Add) { 3603 if (BO->getLHS()->getType()->isPointerType()) { 3604 return getPrimaryDecl(BO->getLHS()); 3605 } else if (BO->getRHS()->getType()->isPointerType()) { 3606 return getPrimaryDecl(BO->getRHS()); 3607 } 3608 } 3609 3610 return 0; 3611 } 3612 case Stmt::ParenExprClass: 3613 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 3614 case Stmt::ImplicitCastExprClass: 3615 // &X[4] when X is an array, has an implicit cast from array to pointer. 3616 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 3617 default: 3618 return 0; 3619 } 3620} 3621 3622/// CheckAddressOfOperand - The operand of & must be either a function 3623/// designator or an lvalue designating an object. If it is an lvalue, the 3624/// object cannot be declared with storage class register or be a bit field. 3625/// Note: The usual conversions are *not* applied to the operand of the & 3626/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 3627/// In C++, the operand might be an overloaded function name, in which case 3628/// we allow the '&' but retain the overloaded-function type. 3629QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 3630 if (op->isTypeDependent()) 3631 return Context.DependentTy; 3632 3633 if (getLangOptions().C99) { 3634 // Implement C99-only parts of addressof rules. 3635 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 3636 if (uOp->getOpcode() == UnaryOperator::Deref) 3637 // Per C99 6.5.3.2, the address of a deref always returns a valid result 3638 // (assuming the deref expression is valid). 3639 return uOp->getSubExpr()->getType(); 3640 } 3641 // Technically, there should be a check for array subscript 3642 // expressions here, but the result of one is always an lvalue anyway. 3643 } 3644 NamedDecl *dcl = getPrimaryDecl(op); 3645 Expr::isLvalueResult lval = op->isLvalue(Context); 3646 3647 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 3648 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 3649 // FIXME: emit more specific diag... 3650 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 3651 << op->getSourceRange(); 3652 return QualType(); 3653 } 3654 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 3655 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemExpr->getMemberDecl())) { 3656 if (Field->isBitField()) { 3657 Diag(OpLoc, diag::err_typecheck_address_of) 3658 << "bit-field" << op->getSourceRange(); 3659 return QualType(); 3660 } 3661 } 3662 // Check for Apple extension for accessing vector components. 3663 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 3664 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 3665 Diag(OpLoc, diag::err_typecheck_address_of) 3666 << "vector element" << op->getSourceRange(); 3667 return QualType(); 3668 } else if (dcl) { // C99 6.5.3.2p1 3669 // We have an lvalue with a decl. Make sure the decl is not declared 3670 // with the register storage-class specifier. 3671 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 3672 if (vd->getStorageClass() == VarDecl::Register) { 3673 Diag(OpLoc, diag::err_typecheck_address_of) 3674 << "register variable" << op->getSourceRange(); 3675 return QualType(); 3676 } 3677 } else if (isa<OverloadedFunctionDecl>(dcl)) { 3678 return Context.OverloadTy; 3679 } else if (isa<FieldDecl>(dcl)) { 3680 // Okay: we can take the address of a field. 3681 // Could be a pointer to member, though, if there is an explicit 3682 // scope qualifier for the class. 3683 if (isa<QualifiedDeclRefExpr>(op)) { 3684 DeclContext *Ctx = dcl->getDeclContext(); 3685 if (Ctx && Ctx->isRecord()) 3686 return Context.getMemberPointerType(op->getType(), 3687 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3688 } 3689 } else if (isa<FunctionDecl>(dcl)) { 3690 // Okay: we can take the address of a function. 3691 // As above. 3692 if (isa<QualifiedDeclRefExpr>(op)) { 3693 DeclContext *Ctx = dcl->getDeclContext(); 3694 if (Ctx && Ctx->isRecord()) 3695 return Context.getMemberPointerType(op->getType(), 3696 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3697 } 3698 } 3699 else 3700 assert(0 && "Unknown/unexpected decl type"); 3701 } 3702 3703 // If the operand has type "type", the result has type "pointer to type". 3704 return Context.getPointerType(op->getType()); 3705} 3706 3707QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 3708 if (Op->isTypeDependent()) 3709 return Context.DependentTy; 3710 3711 UsualUnaryConversions(Op); 3712 QualType Ty = Op->getType(); 3713 3714 // Note that per both C89 and C99, this is always legal, even if ptype is an 3715 // incomplete type or void. It would be possible to warn about dereferencing 3716 // a void pointer, but it's completely well-defined, and such a warning is 3717 // unlikely to catch any mistakes. 3718 if (const PointerType *PT = Ty->getAsPointerType()) 3719 return PT->getPointeeType(); 3720 3721 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 3722 << Ty << Op->getSourceRange(); 3723 return QualType(); 3724} 3725 3726static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 3727 tok::TokenKind Kind) { 3728 BinaryOperator::Opcode Opc; 3729 switch (Kind) { 3730 default: assert(0 && "Unknown binop!"); 3731 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 3732 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 3733 case tok::star: Opc = BinaryOperator::Mul; break; 3734 case tok::slash: Opc = BinaryOperator::Div; break; 3735 case tok::percent: Opc = BinaryOperator::Rem; break; 3736 case tok::plus: Opc = BinaryOperator::Add; break; 3737 case tok::minus: Opc = BinaryOperator::Sub; break; 3738 case tok::lessless: Opc = BinaryOperator::Shl; break; 3739 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 3740 case tok::lessequal: Opc = BinaryOperator::LE; break; 3741 case tok::less: Opc = BinaryOperator::LT; break; 3742 case tok::greaterequal: Opc = BinaryOperator::GE; break; 3743 case tok::greater: Opc = BinaryOperator::GT; break; 3744 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 3745 case tok::equalequal: Opc = BinaryOperator::EQ; break; 3746 case tok::amp: Opc = BinaryOperator::And; break; 3747 case tok::caret: Opc = BinaryOperator::Xor; break; 3748 case tok::pipe: Opc = BinaryOperator::Or; break; 3749 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 3750 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 3751 case tok::equal: Opc = BinaryOperator::Assign; break; 3752 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 3753 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 3754 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 3755 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 3756 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 3757 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 3758 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 3759 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 3760 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 3761 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 3762 case tok::comma: Opc = BinaryOperator::Comma; break; 3763 } 3764 return Opc; 3765} 3766 3767static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 3768 tok::TokenKind Kind) { 3769 UnaryOperator::Opcode Opc; 3770 switch (Kind) { 3771 default: assert(0 && "Unknown unary op!"); 3772 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 3773 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 3774 case tok::amp: Opc = UnaryOperator::AddrOf; break; 3775 case tok::star: Opc = UnaryOperator::Deref; break; 3776 case tok::plus: Opc = UnaryOperator::Plus; break; 3777 case tok::minus: Opc = UnaryOperator::Minus; break; 3778 case tok::tilde: Opc = UnaryOperator::Not; break; 3779 case tok::exclaim: Opc = UnaryOperator::LNot; break; 3780 case tok::kw___real: Opc = UnaryOperator::Real; break; 3781 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 3782 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 3783 } 3784 return Opc; 3785} 3786 3787/// CreateBuiltinBinOp - Creates a new built-in binary operation with 3788/// operator @p Opc at location @c TokLoc. This routine only supports 3789/// built-in operations; ActOnBinOp handles overloaded operators. 3790Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 3791 unsigned Op, 3792 Expr *lhs, Expr *rhs) { 3793 QualType ResultTy; // Result type of the binary operator. 3794 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 3795 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 3796 3797 switch (Opc) { 3798 default: 3799 assert(0 && "Unknown binary expr!"); 3800 case BinaryOperator::Assign: 3801 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 3802 break; 3803 case BinaryOperator::PtrMemD: 3804 case BinaryOperator::PtrMemI: 3805 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 3806 Opc == BinaryOperator::PtrMemI); 3807 break; 3808 case BinaryOperator::Mul: 3809 case BinaryOperator::Div: 3810 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 3811 break; 3812 case BinaryOperator::Rem: 3813 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 3814 break; 3815 case BinaryOperator::Add: 3816 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 3817 break; 3818 case BinaryOperator::Sub: 3819 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 3820 break; 3821 case BinaryOperator::Shl: 3822 case BinaryOperator::Shr: 3823 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 3824 break; 3825 case BinaryOperator::LE: 3826 case BinaryOperator::LT: 3827 case BinaryOperator::GE: 3828 case BinaryOperator::GT: 3829 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 3830 break; 3831 case BinaryOperator::EQ: 3832 case BinaryOperator::NE: 3833 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 3834 break; 3835 case BinaryOperator::And: 3836 case BinaryOperator::Xor: 3837 case BinaryOperator::Or: 3838 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 3839 break; 3840 case BinaryOperator::LAnd: 3841 case BinaryOperator::LOr: 3842 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 3843 break; 3844 case BinaryOperator::MulAssign: 3845 case BinaryOperator::DivAssign: 3846 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 3847 if (!CompTy.isNull()) 3848 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3849 break; 3850 case BinaryOperator::RemAssign: 3851 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 3852 if (!CompTy.isNull()) 3853 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3854 break; 3855 case BinaryOperator::AddAssign: 3856 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 3857 if (!CompTy.isNull()) 3858 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3859 break; 3860 case BinaryOperator::SubAssign: 3861 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 3862 if (!CompTy.isNull()) 3863 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3864 break; 3865 case BinaryOperator::ShlAssign: 3866 case BinaryOperator::ShrAssign: 3867 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 3868 if (!CompTy.isNull()) 3869 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3870 break; 3871 case BinaryOperator::AndAssign: 3872 case BinaryOperator::XorAssign: 3873 case BinaryOperator::OrAssign: 3874 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 3875 if (!CompTy.isNull()) 3876 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3877 break; 3878 case BinaryOperator::Comma: 3879 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 3880 break; 3881 } 3882 if (ResultTy.isNull()) 3883 return ExprError(); 3884 if (CompTy.isNull()) 3885 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 3886 else 3887 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 3888 CompTy, OpLoc)); 3889} 3890 3891// Binary Operators. 'Tok' is the token for the operator. 3892Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 3893 tok::TokenKind Kind, 3894 ExprArg LHS, ExprArg RHS) { 3895 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 3896 Expr *lhs = (Expr *)LHS.release(), *rhs = (Expr*)RHS.release(); 3897 3898 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 3899 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 3900 3901 // If either expression is type-dependent, just build the AST. 3902 // FIXME: We'll need to perform some caching of the result of name 3903 // lookup for operator+. 3904 if (lhs->isTypeDependent() || rhs->isTypeDependent()) { 3905 if (Opc > BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) 3906 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, 3907 Context.DependentTy, 3908 Context.DependentTy, TokLoc)); 3909 else 3910 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, 3911 Context.DependentTy, TokLoc)); 3912 } 3913 3914 if (getLangOptions().CPlusPlus && Opc != BinaryOperator::PtrMemD && 3915 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 3916 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 3917 // If this is one of the assignment operators, we only perform 3918 // overload resolution if the left-hand side is a class or 3919 // enumeration type (C++ [expr.ass]p3). 3920 if (Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign && 3921 !(lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType())) { 3922 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3923 } 3924 3925 // Determine which overloaded operator we're dealing with. 3926 static const OverloadedOperatorKind OverOps[] = { 3927 // Overloading .* is not possible. 3928 static_cast<OverloadedOperatorKind>(0), OO_ArrowStar, 3929 OO_Star, OO_Slash, OO_Percent, 3930 OO_Plus, OO_Minus, 3931 OO_LessLess, OO_GreaterGreater, 3932 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 3933 OO_EqualEqual, OO_ExclaimEqual, 3934 OO_Amp, 3935 OO_Caret, 3936 OO_Pipe, 3937 OO_AmpAmp, 3938 OO_PipePipe, 3939 OO_Equal, OO_StarEqual, 3940 OO_SlashEqual, OO_PercentEqual, 3941 OO_PlusEqual, OO_MinusEqual, 3942 OO_LessLessEqual, OO_GreaterGreaterEqual, 3943 OO_AmpEqual, OO_CaretEqual, 3944 OO_PipeEqual, 3945 OO_Comma 3946 }; 3947 OverloadedOperatorKind OverOp = OverOps[Opc]; 3948 3949 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3950 // to the candidate set. 3951 OverloadCandidateSet CandidateSet; 3952 Expr *Args[2] = { lhs, rhs }; 3953 if (AddOperatorCandidates(OverOp, S, TokLoc, Args, 2, CandidateSet)) 3954 return ExprError(); 3955 3956 // Perform overload resolution. 3957 OverloadCandidateSet::iterator Best; 3958 switch (BestViableFunction(CandidateSet, Best)) { 3959 case OR_Success: { 3960 // We found a built-in operator or an overloaded operator. 3961 FunctionDecl *FnDecl = Best->Function; 3962 3963 if (FnDecl) { 3964 // We matched an overloaded operator. Build a call to that 3965 // operator. 3966 3967 // Convert the arguments. 3968 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3969 if (PerformObjectArgumentInitialization(lhs, Method) || 3970 PerformCopyInitialization(rhs, FnDecl->getParamDecl(0)->getType(), 3971 "passing")) 3972 return ExprError(); 3973 } else { 3974 // Convert the arguments. 3975 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 3976 "passing") || 3977 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 3978 "passing")) 3979 return ExprError(); 3980 } 3981 3982 // Determine the result type 3983 QualType ResultTy 3984 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3985 ResultTy = ResultTy.getNonReferenceType(); 3986 3987 // Build the actual expression node. 3988 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 3989 SourceLocation()); 3990 UsualUnaryConversions(FnExpr); 3991 3992 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 3993 ResultTy, TokLoc)); 3994 } else { 3995 // We matched a built-in operator. Convert the arguments, then 3996 // break out so that we will build the appropriate built-in 3997 // operator node. 3998 if (PerformImplicitConversion(lhs, Best->BuiltinTypes.ParamTypes[0], 3999 Best->Conversions[0], "passing") || 4000 PerformImplicitConversion(rhs, Best->BuiltinTypes.ParamTypes[1], 4001 Best->Conversions[1], "passing")) 4002 return ExprError(); 4003 4004 break; 4005 } 4006 } 4007 4008 case OR_No_Viable_Function: 4009 // No viable function; fall through to handling this as a 4010 // built-in operator, which will produce an error message for us. 4011 break; 4012 4013 case OR_Ambiguous: 4014 Diag(TokLoc, diag::err_ovl_ambiguous_oper) 4015 << BinaryOperator::getOpcodeStr(Opc) 4016 << lhs->getSourceRange() << rhs->getSourceRange(); 4017 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4018 return ExprError(); 4019 4020 case OR_Deleted: 4021 Diag(TokLoc, diag::err_ovl_deleted_oper) 4022 << Best->Function->isDeleted() 4023 << BinaryOperator::getOpcodeStr(Opc) 4024 << lhs->getSourceRange() << rhs->getSourceRange(); 4025 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4026 return ExprError(); 4027 } 4028 4029 // Either we found no viable overloaded operator or we matched a 4030 // built-in operator. In either case, fall through to trying to 4031 // build a built-in operation. 4032 } 4033 4034 // Build a built-in binary operation. 4035 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 4036} 4037 4038// Unary Operators. 'Tok' is the token for the operator. 4039Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 4040 tok::TokenKind Op, ExprArg input) { 4041 // FIXME: Input is modified later, but smart pointer not reassigned. 4042 Expr *Input = (Expr*)input.get(); 4043 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 4044 4045 if (getLangOptions().CPlusPlus && 4046 (Input->getType()->isRecordType() 4047 || Input->getType()->isEnumeralType())) { 4048 // Determine which overloaded operator we're dealing with. 4049 static const OverloadedOperatorKind OverOps[] = { 4050 OO_None, OO_None, 4051 OO_PlusPlus, OO_MinusMinus, 4052 OO_Amp, OO_Star, 4053 OO_Plus, OO_Minus, 4054 OO_Tilde, OO_Exclaim, 4055 OO_None, OO_None, 4056 OO_None, 4057 OO_None 4058 }; 4059 OverloadedOperatorKind OverOp = OverOps[Opc]; 4060 4061 // Add the appropriate overloaded operators (C++ [over.match.oper]) 4062 // to the candidate set. 4063 OverloadCandidateSet CandidateSet; 4064 if (OverOp != OO_None && 4065 AddOperatorCandidates(OverOp, S, OpLoc, &Input, 1, CandidateSet)) 4066 return ExprError(); 4067 4068 // Perform overload resolution. 4069 OverloadCandidateSet::iterator Best; 4070 switch (BestViableFunction(CandidateSet, Best)) { 4071 case OR_Success: { 4072 // We found a built-in operator or an overloaded operator. 4073 FunctionDecl *FnDecl = Best->Function; 4074 4075 if (FnDecl) { 4076 // We matched an overloaded operator. Build a call to that 4077 // operator. 4078 4079 // Convert the arguments. 4080 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 4081 if (PerformObjectArgumentInitialization(Input, Method)) 4082 return ExprError(); 4083 } else { 4084 // Convert the arguments. 4085 if (PerformCopyInitialization(Input, 4086 FnDecl->getParamDecl(0)->getType(), 4087 "passing")) 4088 return ExprError(); 4089 } 4090 4091 // Determine the result type 4092 QualType ResultTy 4093 = FnDecl->getType()->getAsFunctionType()->getResultType(); 4094 ResultTy = ResultTy.getNonReferenceType(); 4095 4096 // Build the actual expression node. 4097 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 4098 SourceLocation()); 4099 UsualUnaryConversions(FnExpr); 4100 4101 input.release(); 4102 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, &Input, 4103 1, ResultTy, OpLoc)); 4104 } else { 4105 // We matched a built-in operator. Convert the arguments, then 4106 // break out so that we will build the appropriate built-in 4107 // operator node. 4108 if (PerformImplicitConversion(Input, Best->BuiltinTypes.ParamTypes[0], 4109 Best->Conversions[0], "passing")) 4110 return ExprError(); 4111 4112 break; 4113 } 4114 } 4115 4116 case OR_No_Viable_Function: 4117 // No viable function; fall through to handling this as a 4118 // built-in operator, which will produce an error message for us. 4119 break; 4120 4121 case OR_Ambiguous: 4122 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 4123 << UnaryOperator::getOpcodeStr(Opc) 4124 << Input->getSourceRange(); 4125 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4126 return ExprError(); 4127 4128 case OR_Deleted: 4129 Diag(OpLoc, diag::err_ovl_deleted_oper) 4130 << Best->Function->isDeleted() 4131 << UnaryOperator::getOpcodeStr(Opc) 4132 << Input->getSourceRange(); 4133 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 4134 return ExprError(); 4135 } 4136 4137 // Either we found no viable overloaded operator or we matched a 4138 // built-in operator. In either case, fall through to trying to 4139 // build a built-in operation. 4140 } 4141 4142 QualType resultType; 4143 switch (Opc) { 4144 default: 4145 assert(0 && "Unimplemented unary expr!"); 4146 case UnaryOperator::PreInc: 4147 case UnaryOperator::PreDec: 4148 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 4149 Opc == UnaryOperator::PreInc); 4150 break; 4151 case UnaryOperator::AddrOf: 4152 resultType = CheckAddressOfOperand(Input, OpLoc); 4153 break; 4154 case UnaryOperator::Deref: 4155 DefaultFunctionArrayConversion(Input); 4156 resultType = CheckIndirectionOperand(Input, OpLoc); 4157 break; 4158 case UnaryOperator::Plus: 4159 case UnaryOperator::Minus: 4160 UsualUnaryConversions(Input); 4161 resultType = Input->getType(); 4162 if (resultType->isDependentType()) 4163 break; 4164 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 4165 break; 4166 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 4167 resultType->isEnumeralType()) 4168 break; 4169 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 4170 Opc == UnaryOperator::Plus && 4171 resultType->isPointerType()) 4172 break; 4173 4174 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4175 << resultType << Input->getSourceRange()); 4176 case UnaryOperator::Not: // bitwise complement 4177 UsualUnaryConversions(Input); 4178 resultType = Input->getType(); 4179 if (resultType->isDependentType()) 4180 break; 4181 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 4182 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 4183 // C99 does not support '~' for complex conjugation. 4184 Diag(OpLoc, diag::ext_integer_complement_complex) 4185 << resultType << Input->getSourceRange(); 4186 else if (!resultType->isIntegerType()) 4187 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4188 << resultType << Input->getSourceRange()); 4189 break; 4190 case UnaryOperator::LNot: // logical negation 4191 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 4192 DefaultFunctionArrayConversion(Input); 4193 resultType = Input->getType(); 4194 if (resultType->isDependentType()) 4195 break; 4196 if (!resultType->isScalarType()) // C99 6.5.3.3p1 4197 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 4198 << resultType << Input->getSourceRange()); 4199 // LNot always has type int. C99 6.5.3.3p5. 4200 // In C++, it's bool. C++ 5.3.1p8 4201 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4202 break; 4203 case UnaryOperator::Real: 4204 case UnaryOperator::Imag: 4205 resultType = CheckRealImagOperand(Input, OpLoc, Opc == UnaryOperator::Real); 4206 break; 4207 case UnaryOperator::Extension: 4208 resultType = Input->getType(); 4209 break; 4210 } 4211 if (resultType.isNull()) 4212 return ExprError(); 4213 input.release(); 4214 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4215} 4216 4217/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4218Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4219 SourceLocation LabLoc, 4220 IdentifierInfo *LabelII) { 4221 // Look up the record for this label identifier. 4222 llvm::DenseMap<IdentifierInfo*, Action::StmtTy*>::iterator I = 4223 ActiveScope->LabelMap.find(LabelII); 4224 4225 LabelStmt *LabelDecl; 4226 4227 // If we haven't seen this label yet, create a forward reference. It 4228 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4229 if (I == ActiveScope->LabelMap.end()) { 4230 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4231 4232 ActiveScope->LabelMap.insert(std::make_pair(LabelII, LabelDecl)); 4233 } else 4234 LabelDecl = static_cast<LabelStmt *>(I->second); 4235 4236 // Create the AST node. The address of a label always has type 'void*'. 4237 return new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4238 Context.getPointerType(Context.VoidTy)); 4239} 4240 4241Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 4242 SourceLocation RPLoc) { // "({..})" 4243 Stmt *SubStmt = static_cast<Stmt*>(substmt); 4244 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4245 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4246 4247 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4248 if (isFileScope) { 4249 return Diag(LPLoc, diag::err_stmtexpr_file_scope); 4250 } 4251 4252 // FIXME: there are a variety of strange constraints to enforce here, for 4253 // example, it is not possible to goto into a stmt expression apparently. 4254 // More semantic analysis is needed. 4255 4256 // FIXME: the last statement in the compount stmt has its value used. We 4257 // should not warn about it being unused. 4258 4259 // If there are sub stmts in the compound stmt, take the type of the last one 4260 // as the type of the stmtexpr. 4261 QualType Ty = Context.VoidTy; 4262 4263 if (!Compound->body_empty()) { 4264 Stmt *LastStmt = Compound->body_back(); 4265 // If LastStmt is a label, skip down through into the body. 4266 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4267 LastStmt = Label->getSubStmt(); 4268 4269 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4270 Ty = LastExpr->getType(); 4271 } 4272 4273 return new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc); 4274} 4275 4276Sema::ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4277 SourceLocation BuiltinLoc, 4278 SourceLocation TypeLoc, 4279 TypeTy *argty, 4280 OffsetOfComponent *CompPtr, 4281 unsigned NumComponents, 4282 SourceLocation RPLoc) { 4283 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4284 assert(!ArgTy.isNull() && "Missing type argument!"); 4285 4286 bool Dependent = ArgTy->isDependentType(); 4287 4288 // We must have at least one component that refers to the type, and the first 4289 // one is known to be a field designator. Verify that the ArgTy represents 4290 // a struct/union/class. 4291 if (!Dependent && !ArgTy->isRecordType()) 4292 return Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy; 4293 4294 // Otherwise, create a null pointer as the base, and iteratively process 4295 // the offsetof designators. 4296 QualType ArgTyPtr = Context.getPointerType(ArgTy); 4297 Expr* Res = new (Context) ImplicitValueInitExpr(ArgTyPtr); 4298 Res = new (Context) UnaryOperator(Res, UnaryOperator::Deref, 4299 ArgTy, SourceLocation()); 4300 4301 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4302 // GCC extension, diagnose them. 4303 // FIXME: This diagnostic isn't actually visible because the location is in 4304 // a system header! 4305 if (NumComponents != 1) 4306 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4307 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4308 4309 if (!Dependent) { 4310 // FIXME: Dependent case loses a lot of information here. And probably 4311 // leaks like a sieve. 4312 for (unsigned i = 0; i != NumComponents; ++i) { 4313 const OffsetOfComponent &OC = CompPtr[i]; 4314 if (OC.isBrackets) { 4315 // Offset of an array sub-field. TODO: Should we allow vector elements? 4316 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4317 if (!AT) { 4318 Res->Destroy(Context); 4319 return Diag(OC.LocEnd, diag::err_offsetof_array_type) 4320 << Res->getType(); 4321 } 4322 4323 // FIXME: C++: Verify that operator[] isn't overloaded. 4324 4325 // Promote the array so it looks more like a normal array subscript 4326 // expression. 4327 DefaultFunctionArrayConversion(Res); 4328 4329 // C99 6.5.2.1p1 4330 Expr *Idx = static_cast<Expr*>(OC.U.E); 4331 if (!Idx->isTypeDependent() && !Idx->getType()->isIntegerType()) 4332 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript) 4333 << Idx->getSourceRange(); 4334 4335 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4336 OC.LocEnd); 4337 continue; 4338 } 4339 4340 const RecordType *RC = Res->getType()->getAsRecordType(); 4341 if (!RC) { 4342 Res->Destroy(Context); 4343 return Diag(OC.LocEnd, diag::err_offsetof_record_type) 4344 << Res->getType(); 4345 } 4346 4347 // Get the decl corresponding to this. 4348 RecordDecl *RD = RC->getDecl(); 4349 FieldDecl *MemberDecl 4350 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4351 LookupMemberName) 4352 .getAsDecl()); 4353 if (!MemberDecl) 4354 return Diag(BuiltinLoc, diag::err_typecheck_no_member) 4355 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd); 4356 4357 // FIXME: C++: Verify that MemberDecl isn't a static field. 4358 // FIXME: Verify that MemberDecl isn't a bitfield. 4359 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 4360 // matter here. 4361 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4362 MemberDecl->getType().getNonReferenceType()); 4363 } 4364 } 4365 4366 return new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4367 Context.getSizeType(), BuiltinLoc); 4368} 4369 4370 4371Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4372 TypeTy *arg1, TypeTy *arg2, 4373 SourceLocation RPLoc) { 4374 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4375 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4376 4377 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4378 4379 return new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, 4380 argT2, RPLoc); 4381} 4382 4383Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 4384 ExprTy *expr1, ExprTy *expr2, 4385 SourceLocation RPLoc) { 4386 Expr *CondExpr = static_cast<Expr*>(cond); 4387 Expr *LHSExpr = static_cast<Expr*>(expr1); 4388 Expr *RHSExpr = static_cast<Expr*>(expr2); 4389 4390 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4391 4392 QualType resType; 4393 if (CondExpr->isValueDependent()) { 4394 resType = Context.DependentTy; 4395 } else { 4396 // The conditional expression is required to be a constant expression. 4397 llvm::APSInt condEval(32); 4398 SourceLocation ExpLoc; 4399 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4400 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant) 4401 << CondExpr->getSourceRange(); 4402 4403 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4404 resType = condEval.getZExtValue() ? LHSExpr->getType() : RHSExpr->getType(); 4405 } 4406 4407 return new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4408 resType, RPLoc); 4409} 4410 4411//===----------------------------------------------------------------------===// 4412// Clang Extensions. 4413//===----------------------------------------------------------------------===// 4414 4415/// ActOnBlockStart - This callback is invoked when a block literal is started. 4416void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4417 // Analyze block parameters. 4418 BlockSemaInfo *BSI = new BlockSemaInfo(); 4419 4420 // Add BSI to CurBlock. 4421 BSI->PrevBlockInfo = CurBlock; 4422 CurBlock = BSI; 4423 ActiveScope = BlockScope; 4424 4425 BSI->ReturnType = 0; 4426 BSI->TheScope = BlockScope; 4427 BSI->hasBlockDeclRefExprs = false; 4428 4429 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4430 PushDeclContext(BlockScope, BSI->TheDecl); 4431} 4432 4433void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4434 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4435 4436 if (ParamInfo.getNumTypeObjects() == 0 4437 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4438 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4439 4440 // The type is entirely optional as well, if none, use DependentTy. 4441 if (T.isNull()) 4442 T = Context.DependentTy; 4443 4444 // The parameter list is optional, if there was none, assume (). 4445 if (!T->isFunctionType()) 4446 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4447 4448 CurBlock->hasPrototype = true; 4449 CurBlock->isVariadic = false; 4450 Type *RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4451 .getTypePtr(); 4452 4453 if (!RetTy->isDependentType()) 4454 CurBlock->ReturnType = RetTy; 4455 return; 4456 } 4457 4458 // Analyze arguments to block. 4459 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4460 "Not a function declarator!"); 4461 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4462 4463 CurBlock->hasPrototype = FTI.hasPrototype; 4464 CurBlock->isVariadic = true; 4465 4466 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4467 // no arguments, not a function that takes a single void argument. 4468 if (FTI.hasPrototype && 4469 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4470 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 4471 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 4472 // empty arg list, don't push any params. 4473 CurBlock->isVariadic = false; 4474 } else if (FTI.hasPrototype) { 4475 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4476 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 4477 CurBlock->isVariadic = FTI.isVariadic; 4478 QualType T = GetTypeForDeclarator (ParamInfo, CurScope); 4479 4480 Type* RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4481 .getTypePtr(); 4482 4483 if (!RetTy->isDependentType()) 4484 CurBlock->ReturnType = RetTy; 4485 } 4486 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 4487 4488 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4489 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4490 // If this has an identifier, add it to the scope stack. 4491 if ((*AI)->getIdentifier()) 4492 PushOnScopeChains(*AI, CurBlock->TheScope); 4493} 4494 4495/// ActOnBlockError - If there is an error parsing a block, this callback 4496/// is invoked to pop the information about the block from the action impl. 4497void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4498 // Ensure that CurBlock is deleted. 4499 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4500 4501 // Pop off CurBlock, handle nested blocks. 4502 CurBlock = CurBlock->PrevBlockInfo; 4503 4504 // FIXME: Delete the ParmVarDecl objects as well??? 4505 4506} 4507 4508/// ActOnBlockStmtExpr - This is called when the body of a block statement 4509/// literal was successfully completed. ^(int x){...} 4510Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 4511 Scope *CurScope) { 4512 // Ensure that CurBlock is deleted. 4513 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4514 ExprOwningPtr<CompoundStmt> Body(this, static_cast<CompoundStmt*>(body)); 4515 4516 PopDeclContext(); 4517 4518 // Before poping CurBlock, set ActiveScope to this scopes parent. 4519 ActiveScope = CurBlock->TheScope->getParent(); 4520 4521 // Pop off CurBlock, handle nested blocks. 4522 CurBlock = CurBlock->PrevBlockInfo; 4523 4524 QualType RetTy = Context.VoidTy; 4525 if (BSI->ReturnType) 4526 RetTy = QualType(BSI->ReturnType, 0); 4527 4528 llvm::SmallVector<QualType, 8> ArgTypes; 4529 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4530 ArgTypes.push_back(BSI->Params[i]->getType()); 4531 4532 QualType BlockTy; 4533 if (!BSI->hasPrototype) 4534 BlockTy = Context.getFunctionNoProtoType(RetTy); 4535 else 4536 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 4537 BSI->isVariadic, 0); 4538 4539 BlockTy = Context.getBlockPointerType(BlockTy); 4540 4541 BSI->TheDecl->setBody(Body.take()); 4542 return new (Context) BlockExpr(BSI->TheDecl, BlockTy, BSI->hasBlockDeclRefExprs); 4543} 4544 4545Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 4546 ExprTy *expr, TypeTy *type, 4547 SourceLocation RPLoc) { 4548 Expr *E = static_cast<Expr*>(expr); 4549 QualType T = QualType::getFromOpaquePtr(type); 4550 4551 InitBuiltinVaListType(); 4552 4553 // Get the va_list type 4554 QualType VaListType = Context.getBuiltinVaListType(); 4555 // Deal with implicit array decay; for example, on x86-64, 4556 // va_list is an array, but it's supposed to decay to 4557 // a pointer for va_arg. 4558 if (VaListType->isArrayType()) 4559 VaListType = Context.getArrayDecayedType(VaListType); 4560 // Make sure the input expression also decays appropriately. 4561 UsualUnaryConversions(E); 4562 4563 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 4564 return Diag(E->getLocStart(), 4565 diag::err_first_argument_to_va_arg_not_of_type_va_list) 4566 << E->getType() << E->getSourceRange(); 4567 4568 // FIXME: Warn if a non-POD type is passed in. 4569 4570 return new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 4571} 4572 4573Sema::ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 4574 // The type of __null will be int or long, depending on the size of 4575 // pointers on the target. 4576 QualType Ty; 4577 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 4578 Ty = Context.IntTy; 4579 else 4580 Ty = Context.LongTy; 4581 4582 return new (Context) GNUNullExpr(Ty, TokenLoc); 4583} 4584 4585bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 4586 SourceLocation Loc, 4587 QualType DstType, QualType SrcType, 4588 Expr *SrcExpr, const char *Flavor) { 4589 // Decode the result (notice that AST's are still created for extensions). 4590 bool isInvalid = false; 4591 unsigned DiagKind; 4592 switch (ConvTy) { 4593 default: assert(0 && "Unknown conversion type"); 4594 case Compatible: return false; 4595 case PointerToInt: 4596 DiagKind = diag::ext_typecheck_convert_pointer_int; 4597 break; 4598 case IntToPointer: 4599 DiagKind = diag::ext_typecheck_convert_int_pointer; 4600 break; 4601 case IncompatiblePointer: 4602 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 4603 break; 4604 case FunctionVoidPointer: 4605 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 4606 break; 4607 case CompatiblePointerDiscardsQualifiers: 4608 // If the qualifiers lost were because we were applying the 4609 // (deprecated) C++ conversion from a string literal to a char* 4610 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 4611 // Ideally, this check would be performed in 4612 // CheckPointerTypesForAssignment. However, that would require a 4613 // bit of refactoring (so that the second argument is an 4614 // expression, rather than a type), which should be done as part 4615 // of a larger effort to fix CheckPointerTypesForAssignment for 4616 // C++ semantics. 4617 if (getLangOptions().CPlusPlus && 4618 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 4619 return false; 4620 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 4621 break; 4622 case IntToBlockPointer: 4623 DiagKind = diag::err_int_to_block_pointer; 4624 break; 4625 case IncompatibleBlockPointer: 4626 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 4627 break; 4628 case IncompatibleObjCQualifiedId: 4629 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 4630 // it can give a more specific diagnostic. 4631 DiagKind = diag::warn_incompatible_qualified_id; 4632 break; 4633 case IncompatibleVectors: 4634 DiagKind = diag::warn_incompatible_vectors; 4635 break; 4636 case Incompatible: 4637 DiagKind = diag::err_typecheck_convert_incompatible; 4638 isInvalid = true; 4639 break; 4640 } 4641 4642 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 4643 << SrcExpr->getSourceRange(); 4644 return isInvalid; 4645} 4646 4647bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 4648{ 4649 Expr::EvalResult EvalResult; 4650 4651 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 4652 EvalResult.HasSideEffects) { 4653 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 4654 4655 if (EvalResult.Diag) { 4656 // We only show the note if it's not the usual "invalid subexpression" 4657 // or if it's actually in a subexpression. 4658 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 4659 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 4660 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4661 } 4662 4663 return true; 4664 } 4665 4666 if (EvalResult.Diag) { 4667 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 4668 E->getSourceRange(); 4669 4670 // Print the reason it's not a constant. 4671 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4672 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4673 } 4674 4675 if (Result) 4676 *Result = EvalResult.Val.getInt(); 4677 return false; 4678} 4679