SemaExpr.cpp revision b104b1f6ca76cefab25c6ecb5df3bf87a0f875d3
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 30/// DiagnoseUseOfDeprecatedDeclImpl - If the specified decl is deprecated or 31// unavailable, emit the corresponding diagnostics. 32void Sema::DiagnoseUseOfDeprecatedDeclImpl(NamedDecl *D, SourceLocation Loc) { 33 // See if the decl is deprecated. 34 if (D->getAttr<DeprecatedAttr>()) { 35 // If this reference happens *in* a deprecated function or method, don't 36 // warn. Implementing deprecated stuff requires referencing depreated 37 // stuff. 38 NamedDecl *ND = getCurFunctionOrMethodDecl(); 39 if (ND == 0 || !ND->getAttr<DeprecatedAttr>()) 40 Diag(Loc, diag::warn_deprecated) << D->getDeclName(); 41 } 42 43 // See if hte decl is unavailable. 44 if (D->getAttr<UnavailableAttr>()) 45 Diag(Loc, diag::warn_unavailable) << D->getDeclName(); 46} 47 48//===----------------------------------------------------------------------===// 49// Standard Promotions and Conversions 50//===----------------------------------------------------------------------===// 51 52/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 53void Sema::DefaultFunctionArrayConversion(Expr *&E) { 54 QualType Ty = E->getType(); 55 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 56 57 if (Ty->isFunctionType()) 58 ImpCastExprToType(E, Context.getPointerType(Ty)); 59 else if (Ty->isArrayType()) { 60 // In C90 mode, arrays only promote to pointers if the array expression is 61 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 62 // type 'array of type' is converted to an expression that has type 'pointer 63 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 64 // that has type 'array of type' ...". The relevant change is "an lvalue" 65 // (C90) to "an expression" (C99). 66 // 67 // C++ 4.2p1: 68 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 69 // T" can be converted to an rvalue of type "pointer to T". 70 // 71 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 72 E->isLvalue(Context) == Expr::LV_Valid) 73 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 74 } 75} 76 77/// UsualUnaryConversions - Performs various conversions that are common to most 78/// operators (C99 6.3). The conversions of array and function types are 79/// sometimes surpressed. For example, the array->pointer conversion doesn't 80/// apply if the array is an argument to the sizeof or address (&) operators. 81/// In these instances, this routine should *not* be called. 82Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 83 QualType Ty = Expr->getType(); 84 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 85 86 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 87 ImpCastExprToType(Expr, Context.IntTy); 88 else 89 DefaultFunctionArrayConversion(Expr); 90 91 return Expr; 92} 93 94/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 95/// do not have a prototype. Arguments that have type float are promoted to 96/// double. All other argument types are converted by UsualUnaryConversions(). 97void Sema::DefaultArgumentPromotion(Expr *&Expr) { 98 QualType Ty = Expr->getType(); 99 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 100 101 // If this is a 'float' (CVR qualified or typedef) promote to double. 102 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 103 if (BT->getKind() == BuiltinType::Float) 104 return ImpCastExprToType(Expr, Context.DoubleTy); 105 106 UsualUnaryConversions(Expr); 107} 108 109// DefaultVariadicArgumentPromotion - Like DefaultArgumentPromotion, but 110// will warn if the resulting type is not a POD type. 111void Sema::DefaultVariadicArgumentPromotion(Expr *&Expr, VariadicCallType CT) { 112 DefaultArgumentPromotion(Expr); 113 114 if (!Expr->getType()->isPODType()) { 115 Diag(Expr->getLocStart(), 116 diag::warn_cannot_pass_non_pod_arg_to_vararg) << 117 Expr->getType() << CT; 118 } 119} 120 121 122/// UsualArithmeticConversions - Performs various conversions that are common to 123/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 124/// routine returns the first non-arithmetic type found. The client is 125/// responsible for emitting appropriate error diagnostics. 126/// FIXME: verify the conversion rules for "complex int" are consistent with 127/// GCC. 128QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 129 bool isCompAssign) { 130 if (!isCompAssign) { 131 UsualUnaryConversions(lhsExpr); 132 UsualUnaryConversions(rhsExpr); 133 } 134 135 // For conversion purposes, we ignore any qualifiers. 136 // For example, "const float" and "float" are equivalent. 137 QualType lhs = 138 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 139 QualType rhs = 140 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 141 142 // If both types are identical, no conversion is needed. 143 if (lhs == rhs) 144 return lhs; 145 146 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 147 // The caller can deal with this (e.g. pointer + int). 148 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 149 return lhs; 150 151 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 152 if (!isCompAssign) { 153 ImpCastExprToType(lhsExpr, destType); 154 ImpCastExprToType(rhsExpr, destType); 155 } 156 return destType; 157} 158 159QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 160 // Perform the usual unary conversions. We do this early so that 161 // integral promotions to "int" can allow us to exit early, in the 162 // lhs == rhs check. Also, for conversion purposes, we ignore any 163 // qualifiers. For example, "const float" and "float" are 164 // equivalent. 165 if (lhs->isPromotableIntegerType()) 166 lhs = Context.IntTy; 167 else 168 lhs = lhs.getUnqualifiedType(); 169 if (rhs->isPromotableIntegerType()) 170 rhs = Context.IntTy; 171 else 172 rhs = rhs.getUnqualifiedType(); 173 174 // If both types are identical, no conversion is needed. 175 if (lhs == rhs) 176 return lhs; 177 178 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 179 // The caller can deal with this (e.g. pointer + int). 180 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 181 return lhs; 182 183 // At this point, we have two different arithmetic types. 184 185 // Handle complex types first (C99 6.3.1.8p1). 186 if (lhs->isComplexType() || rhs->isComplexType()) { 187 // if we have an integer operand, the result is the complex type. 188 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 189 // convert the rhs to the lhs complex type. 190 return lhs; 191 } 192 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 193 // convert the lhs to the rhs complex type. 194 return rhs; 195 } 196 // This handles complex/complex, complex/float, or float/complex. 197 // When both operands are complex, the shorter operand is converted to the 198 // type of the longer, and that is the type of the result. This corresponds 199 // to what is done when combining two real floating-point operands. 200 // The fun begins when size promotion occur across type domains. 201 // From H&S 6.3.4: When one operand is complex and the other is a real 202 // floating-point type, the less precise type is converted, within it's 203 // real or complex domain, to the precision of the other type. For example, 204 // when combining a "long double" with a "double _Complex", the 205 // "double _Complex" is promoted to "long double _Complex". 206 int result = Context.getFloatingTypeOrder(lhs, rhs); 207 208 if (result > 0) { // The left side is bigger, convert rhs. 209 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 210 } else if (result < 0) { // The right side is bigger, convert lhs. 211 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 212 } 213 // At this point, lhs and rhs have the same rank/size. Now, make sure the 214 // domains match. This is a requirement for our implementation, C99 215 // does not require this promotion. 216 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 217 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 218 return rhs; 219 } else { // handle "_Complex double, double". 220 return lhs; 221 } 222 } 223 return lhs; // The domain/size match exactly. 224 } 225 // Now handle "real" floating types (i.e. float, double, long double). 226 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 227 // if we have an integer operand, the result is the real floating type. 228 if (rhs->isIntegerType()) { 229 // convert rhs to the lhs floating point type. 230 return lhs; 231 } 232 if (rhs->isComplexIntegerType()) { 233 // convert rhs to the complex floating point type. 234 return Context.getComplexType(lhs); 235 } 236 if (lhs->isIntegerType()) { 237 // convert lhs to the rhs floating point type. 238 return rhs; 239 } 240 if (lhs->isComplexIntegerType()) { 241 // convert lhs to the complex floating point type. 242 return Context.getComplexType(rhs); 243 } 244 // We have two real floating types, float/complex combos were handled above. 245 // Convert the smaller operand to the bigger result. 246 int result = Context.getFloatingTypeOrder(lhs, rhs); 247 if (result > 0) // convert the rhs 248 return lhs; 249 assert(result < 0 && "illegal float comparison"); 250 return rhs; // convert the lhs 251 } 252 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 253 // Handle GCC complex int extension. 254 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 255 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 256 257 if (lhsComplexInt && rhsComplexInt) { 258 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 259 rhsComplexInt->getElementType()) >= 0) 260 return lhs; // convert the rhs 261 return rhs; 262 } else if (lhsComplexInt && rhs->isIntegerType()) { 263 // convert the rhs to the lhs complex type. 264 return lhs; 265 } else if (rhsComplexInt && lhs->isIntegerType()) { 266 // convert the lhs to the rhs complex type. 267 return rhs; 268 } 269 } 270 // Finally, we have two differing integer types. 271 // The rules for this case are in C99 6.3.1.8 272 int compare = Context.getIntegerTypeOrder(lhs, rhs); 273 bool lhsSigned = lhs->isSignedIntegerType(), 274 rhsSigned = rhs->isSignedIntegerType(); 275 QualType destType; 276 if (lhsSigned == rhsSigned) { 277 // Same signedness; use the higher-ranked type 278 destType = compare >= 0 ? lhs : rhs; 279 } else if (compare != (lhsSigned ? 1 : -1)) { 280 // The unsigned type has greater than or equal rank to the 281 // signed type, so use the unsigned type 282 destType = lhsSigned ? rhs : lhs; 283 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 284 // The two types are different widths; if we are here, that 285 // means the signed type is larger than the unsigned type, so 286 // use the signed type. 287 destType = lhsSigned ? lhs : rhs; 288 } else { 289 // The signed type is higher-ranked than the unsigned type, 290 // but isn't actually any bigger (like unsigned int and long 291 // on most 32-bit systems). Use the unsigned type corresponding 292 // to the signed type. 293 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 294 } 295 return destType; 296} 297 298//===----------------------------------------------------------------------===// 299// Semantic Analysis for various Expression Types 300//===----------------------------------------------------------------------===// 301 302 303/// ActOnStringLiteral - The specified tokens were lexed as pasted string 304/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 305/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 306/// multiple tokens. However, the common case is that StringToks points to one 307/// string. 308/// 309Action::OwningExprResult 310Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 311 assert(NumStringToks && "Must have at least one string!"); 312 313 StringLiteralParser Literal(StringToks, NumStringToks, PP); 314 if (Literal.hadError) 315 return ExprError(); 316 317 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 318 for (unsigned i = 0; i != NumStringToks; ++i) 319 StringTokLocs.push_back(StringToks[i].getLocation()); 320 321 QualType StrTy = Context.CharTy; 322 if (Literal.AnyWide) StrTy = Context.getWCharType(); 323 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 324 325 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 326 if (getLangOptions().CPlusPlus) 327 StrTy.addConst(); 328 329 // Get an array type for the string, according to C99 6.4.5. This includes 330 // the nul terminator character as well as the string length for pascal 331 // strings. 332 StrTy = Context.getConstantArrayType(StrTy, 333 llvm::APInt(32, Literal.GetStringLength()+1), 334 ArrayType::Normal, 0); 335 336 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 337 return Owned(new (Context) StringLiteral(Context, Literal.GetString(), 338 Literal.GetStringLength(), 339 Literal.AnyWide, StrTy, 340 StringToks[0].getLocation(), 341 StringToks[NumStringToks-1].getLocation())); 342} 343 344/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 345/// CurBlock to VD should cause it to be snapshotted (as we do for auto 346/// variables defined outside the block) or false if this is not needed (e.g. 347/// for values inside the block or for globals). 348/// 349/// FIXME: This will create BlockDeclRefExprs for global variables, 350/// function references, etc which is suboptimal :) and breaks 351/// things like "integer constant expression" tests. 352static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 353 ValueDecl *VD) { 354 // If the value is defined inside the block, we couldn't snapshot it even if 355 // we wanted to. 356 if (CurBlock->TheDecl == VD->getDeclContext()) 357 return false; 358 359 // If this is an enum constant or function, it is constant, don't snapshot. 360 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 361 return false; 362 363 // If this is a reference to an extern, static, or global variable, no need to 364 // snapshot it. 365 // FIXME: What about 'const' variables in C++? 366 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 367 return Var->hasLocalStorage(); 368 369 return true; 370} 371 372 373 374/// ActOnIdentifierExpr - The parser read an identifier in expression context, 375/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 376/// identifier is used in a function call context. 377/// SS is only used for a C++ qualified-id (foo::bar) to indicate the 378/// class or namespace that the identifier must be a member of. 379Sema::OwningExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 380 IdentifierInfo &II, 381 bool HasTrailingLParen, 382 const CXXScopeSpec *SS, 383 bool isAddressOfOperand) { 384 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS, 385 isAddressOfOperand); 386} 387 388/// BuildDeclRefExpr - Build either a DeclRefExpr or a 389/// QualifiedDeclRefExpr based on whether or not SS is a 390/// nested-name-specifier. 391DeclRefExpr * 392Sema::BuildDeclRefExpr(NamedDecl *D, QualType Ty, SourceLocation Loc, 393 bool TypeDependent, bool ValueDependent, 394 const CXXScopeSpec *SS) { 395 if (SS && !SS->isEmpty()) 396 return new (Context) QualifiedDeclRefExpr(D, Ty, Loc, TypeDependent, 397 ValueDependent, SS->getRange().getBegin()); 398 else 399 return new (Context) DeclRefExpr(D, Ty, Loc, TypeDependent, ValueDependent); 400} 401 402/// getObjectForAnonymousRecordDecl - Retrieve the (unnamed) field or 403/// variable corresponding to the anonymous union or struct whose type 404/// is Record. 405static Decl *getObjectForAnonymousRecordDecl(RecordDecl *Record) { 406 assert(Record->isAnonymousStructOrUnion() && 407 "Record must be an anonymous struct or union!"); 408 409 // FIXME: Once Decls are directly linked together, this will 410 // be an O(1) operation rather than a slow walk through DeclContext's 411 // vector (which itself will be eliminated). DeclGroups might make 412 // this even better. 413 DeclContext *Ctx = Record->getDeclContext(); 414 for (DeclContext::decl_iterator D = Ctx->decls_begin(), 415 DEnd = Ctx->decls_end(); 416 D != DEnd; ++D) { 417 if (*D == Record) { 418 // The object for the anonymous struct/union directly 419 // follows its type in the list of declarations. 420 ++D; 421 assert(D != DEnd && "Missing object for anonymous record"); 422 assert(!cast<NamedDecl>(*D)->getDeclName() && "Decl should be unnamed"); 423 return *D; 424 } 425 } 426 427 assert(false && "Missing object for anonymous record"); 428 return 0; 429} 430 431Sema::OwningExprResult 432Sema::BuildAnonymousStructUnionMemberReference(SourceLocation Loc, 433 FieldDecl *Field, 434 Expr *BaseObjectExpr, 435 SourceLocation OpLoc) { 436 assert(Field->getDeclContext()->isRecord() && 437 cast<RecordDecl>(Field->getDeclContext())->isAnonymousStructOrUnion() 438 && "Field must be stored inside an anonymous struct or union"); 439 440 // Construct the sequence of field member references 441 // we'll have to perform to get to the field in the anonymous 442 // union/struct. The list of members is built from the field 443 // outward, so traverse it backwards to go from an object in 444 // the current context to the field we found. 445 llvm::SmallVector<FieldDecl *, 4> AnonFields; 446 AnonFields.push_back(Field); 447 VarDecl *BaseObject = 0; 448 DeclContext *Ctx = Field->getDeclContext(); 449 do { 450 RecordDecl *Record = cast<RecordDecl>(Ctx); 451 Decl *AnonObject = getObjectForAnonymousRecordDecl(Record); 452 if (FieldDecl *AnonField = dyn_cast<FieldDecl>(AnonObject)) 453 AnonFields.push_back(AnonField); 454 else { 455 BaseObject = cast<VarDecl>(AnonObject); 456 break; 457 } 458 Ctx = Ctx->getParent(); 459 } while (Ctx->isRecord() && 460 cast<RecordDecl>(Ctx)->isAnonymousStructOrUnion()); 461 462 // Build the expression that refers to the base object, from 463 // which we will build a sequence of member references to each 464 // of the anonymous union objects and, eventually, the field we 465 // found via name lookup. 466 bool BaseObjectIsPointer = false; 467 unsigned ExtraQuals = 0; 468 if (BaseObject) { 469 // BaseObject is an anonymous struct/union variable (and is, 470 // therefore, not part of another non-anonymous record). 471 if (BaseObjectExpr) BaseObjectExpr->Destroy(Context); 472 BaseObjectExpr = new (Context) DeclRefExpr(BaseObject,BaseObject->getType(), 473 SourceLocation()); 474 ExtraQuals 475 = Context.getCanonicalType(BaseObject->getType()).getCVRQualifiers(); 476 } else if (BaseObjectExpr) { 477 // The caller provided the base object expression. Determine 478 // whether its a pointer and whether it adds any qualifiers to the 479 // anonymous struct/union fields we're looking into. 480 QualType ObjectType = BaseObjectExpr->getType(); 481 if (const PointerType *ObjectPtr = ObjectType->getAsPointerType()) { 482 BaseObjectIsPointer = true; 483 ObjectType = ObjectPtr->getPointeeType(); 484 } 485 ExtraQuals = Context.getCanonicalType(ObjectType).getCVRQualifiers(); 486 } else { 487 // We've found a member of an anonymous struct/union that is 488 // inside a non-anonymous struct/union, so in a well-formed 489 // program our base object expression is "this". 490 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 491 if (!MD->isStatic()) { 492 QualType AnonFieldType 493 = Context.getTagDeclType( 494 cast<RecordDecl>(AnonFields.back()->getDeclContext())); 495 QualType ThisType = Context.getTagDeclType(MD->getParent()); 496 if ((Context.getCanonicalType(AnonFieldType) 497 == Context.getCanonicalType(ThisType)) || 498 IsDerivedFrom(ThisType, AnonFieldType)) { 499 // Our base object expression is "this". 500 BaseObjectExpr = new (Context) CXXThisExpr(SourceLocation(), 501 MD->getThisType(Context)); 502 BaseObjectIsPointer = true; 503 } 504 } else { 505 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 506 << Field->getDeclName()); 507 } 508 ExtraQuals = MD->getTypeQualifiers(); 509 } 510 511 if (!BaseObjectExpr) 512 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 513 << Field->getDeclName()); 514 } 515 516 // Build the implicit member references to the field of the 517 // anonymous struct/union. 518 Expr *Result = BaseObjectExpr; 519 for (llvm::SmallVector<FieldDecl *, 4>::reverse_iterator 520 FI = AnonFields.rbegin(), FIEnd = AnonFields.rend(); 521 FI != FIEnd; ++FI) { 522 QualType MemberType = (*FI)->getType(); 523 if (!(*FI)->isMutable()) { 524 unsigned combinedQualifiers 525 = MemberType.getCVRQualifiers() | ExtraQuals; 526 MemberType = MemberType.getQualifiedType(combinedQualifiers); 527 } 528 Result = new (Context) MemberExpr(Result, BaseObjectIsPointer, *FI, 529 OpLoc, MemberType); 530 BaseObjectIsPointer = false; 531 ExtraQuals = Context.getCanonicalType(MemberType).getCVRQualifiers(); 532 OpLoc = SourceLocation(); 533 } 534 535 return Owned(Result); 536} 537 538/// ActOnDeclarationNameExpr - The parser has read some kind of name 539/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 540/// performs lookup on that name and returns an expression that refers 541/// to that name. This routine isn't directly called from the parser, 542/// because the parser doesn't know about DeclarationName. Rather, 543/// this routine is called by ActOnIdentifierExpr, 544/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 545/// which form the DeclarationName from the corresponding syntactic 546/// forms. 547/// 548/// HasTrailingLParen indicates whether this identifier is used in a 549/// function call context. LookupCtx is only used for a C++ 550/// qualified-id (foo::bar) to indicate the class or namespace that 551/// the identifier must be a member of. 552/// 553/// isAddressOfOperand means that this expression is the direct operand 554/// of an address-of operator. This matters because this is the only 555/// situation where a qualified name referencing a non-static member may 556/// appear outside a member function of this class. 557Sema::OwningExprResult 558Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 559 DeclarationName Name, bool HasTrailingLParen, 560 const CXXScopeSpec *SS, 561 bool isAddressOfOperand) { 562 // Could be enum-constant, value decl, instance variable, etc. 563 if (SS && SS->isInvalid()) 564 return ExprError(); 565 LookupResult Lookup = LookupParsedName(S, SS, Name, LookupOrdinaryName, 566 false, true, Loc); 567 568 if (getLangOptions().CPlusPlus && (!SS || !SS->isSet()) && 569 HasTrailingLParen && Lookup.getKind() == LookupResult::NotFound) { 570 // We've seen something of the form 571 // 572 // identifier( 573 // 574 // and we did not find any entity by the name 575 // "identifier". However, this identifier is still subject to 576 // argument-dependent lookup, so keep track of the name. 577 return Owned(new (Context) UnresolvedFunctionNameExpr(Name, 578 Context.OverloadTy, 579 Loc)); 580 } 581 582 NamedDecl *D = 0; 583 if (Lookup.isAmbiguous()) { 584 DiagnoseAmbiguousLookup(Lookup, Name, Loc, 585 SS && SS->isSet() ? SS->getRange() 586 : SourceRange()); 587 return ExprError(); 588 } else 589 D = Lookup.getAsDecl(); 590 591 // If this reference is in an Objective-C method, then ivar lookup happens as 592 // well. 593 IdentifierInfo *II = Name.getAsIdentifierInfo(); 594 if (II && getCurMethodDecl()) { 595 // There are two cases to handle here. 1) scoped lookup could have failed, 596 // in which case we should look for an ivar. 2) scoped lookup could have 597 // found a decl, but that decl is outside the current method (i.e. a global 598 // variable). In these two cases, we do a lookup for an ivar with this 599 // name, if the lookup suceeds, we replace it our current decl. 600 if (D == 0 || D->isDefinedOutsideFunctionOrMethod()) { 601 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 602 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II)) { 603 // FIXME: This should use a new expr for a direct reference, don't turn 604 // this into Self->ivar, just return a BareIVarExpr or something. 605 IdentifierInfo &II = Context.Idents.get("self"); 606 OwningExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 607 ObjCIvarRefExpr *MRef = new (Context) ObjCIvarRefExpr(IV, IV->getType(), 608 Loc, static_cast<Expr*>(SelfExpr.release()), 609 true, true); 610 Context.setFieldDecl(IFace, IV, MRef); 611 return Owned(MRef); 612 } 613 } 614 // Needed to implement property "super.method" notation. 615 if (D == 0 && II->isStr("super")) { 616 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 617 getCurMethodDecl()->getClassInterface())); 618 return Owned(new (Context) ObjCSuperExpr(Loc, T)); 619 } 620 } 621 if (D == 0) { 622 // Otherwise, this could be an implicitly declared function reference (legal 623 // in C90, extension in C99). 624 if (HasTrailingLParen && II && 625 !getLangOptions().CPlusPlus) // Not in C++. 626 D = ImplicitlyDefineFunction(Loc, *II, S); 627 else { 628 // If this name wasn't predeclared and if this is not a function call, 629 // diagnose the problem. 630 if (SS && !SS->isEmpty()) 631 return ExprError(Diag(Loc, diag::err_typecheck_no_member) 632 << Name << SS->getRange()); 633 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 634 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 635 return ExprError(Diag(Loc, diag::err_undeclared_use) 636 << Name.getAsString()); 637 else 638 return ExprError(Diag(Loc, diag::err_undeclared_var_use) << Name); 639 } 640 } 641 642 // If this is an expression of the form &Class::member, don't build an 643 // implicit member ref, because we want a pointer to the member in general, 644 // not any specific instance's member. 645 if (isAddressOfOperand && SS && !SS->isEmpty() && !HasTrailingLParen) { 646 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 647 if (D && isa<CXXRecordDecl>(DC)) { 648 QualType DType; 649 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 650 DType = FD->getType().getNonReferenceType(); 651 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 652 DType = Method->getType(); 653 } else if (isa<OverloadedFunctionDecl>(D)) { 654 DType = Context.OverloadTy; 655 } 656 // Could be an inner type. That's diagnosed below, so ignore it here. 657 if (!DType.isNull()) { 658 // The pointer is type- and value-dependent if it points into something 659 // dependent. 660 bool Dependent = false; 661 for (; DC; DC = DC->getParent()) { 662 // FIXME: could stop early at namespace scope. 663 if (DC->isRecord()) { 664 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 665 if (Context.getTypeDeclType(Record)->isDependentType()) { 666 Dependent = true; 667 break; 668 } 669 } 670 } 671 return Owned(BuildDeclRefExpr(D, DType, Loc, Dependent, Dependent, SS)); 672 } 673 } 674 } 675 676 // We may have found a field within an anonymous union or struct 677 // (C++ [class.union]). 678 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) 679 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 680 return BuildAnonymousStructUnionMemberReference(Loc, FD); 681 682 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 683 if (!MD->isStatic()) { 684 // C++ [class.mfct.nonstatic]p2: 685 // [...] if name lookup (3.4.1) resolves the name in the 686 // id-expression to a nonstatic nontype member of class X or of 687 // a base class of X, the id-expression is transformed into a 688 // class member access expression (5.2.5) using (*this) (9.3.2) 689 // as the postfix-expression to the left of the '.' operator. 690 DeclContext *Ctx = 0; 691 QualType MemberType; 692 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 693 Ctx = FD->getDeclContext(); 694 MemberType = FD->getType(); 695 696 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 697 MemberType = RefType->getPointeeType(); 698 else if (!FD->isMutable()) { 699 unsigned combinedQualifiers 700 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 701 MemberType = MemberType.getQualifiedType(combinedQualifiers); 702 } 703 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 704 if (!Method->isStatic()) { 705 Ctx = Method->getParent(); 706 MemberType = Method->getType(); 707 } 708 } else if (OverloadedFunctionDecl *Ovl 709 = dyn_cast<OverloadedFunctionDecl>(D)) { 710 for (OverloadedFunctionDecl::function_iterator 711 Func = Ovl->function_begin(), 712 FuncEnd = Ovl->function_end(); 713 Func != FuncEnd; ++Func) { 714 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 715 if (!DMethod->isStatic()) { 716 Ctx = Ovl->getDeclContext(); 717 MemberType = Context.OverloadTy; 718 break; 719 } 720 } 721 } 722 723 if (Ctx && Ctx->isRecord()) { 724 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 725 QualType ThisType = Context.getTagDeclType(MD->getParent()); 726 if ((Context.getCanonicalType(CtxType) 727 == Context.getCanonicalType(ThisType)) || 728 IsDerivedFrom(ThisType, CtxType)) { 729 // Build the implicit member access expression. 730 Expr *This = new (Context) CXXThisExpr(SourceLocation(), 731 MD->getThisType(Context)); 732 return Owned(new (Context) MemberExpr(This, true, D, 733 SourceLocation(), MemberType)); 734 } 735 } 736 } 737 } 738 739 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 740 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 741 if (MD->isStatic()) 742 // "invalid use of member 'x' in static member function" 743 return ExprError(Diag(Loc,diag::err_invalid_member_use_in_static_method) 744 << FD->getDeclName()); 745 } 746 747 // Any other ways we could have found the field in a well-formed 748 // program would have been turned into implicit member expressions 749 // above. 750 return ExprError(Diag(Loc, diag::err_invalid_non_static_member_use) 751 << FD->getDeclName()); 752 } 753 754 if (isa<TypedefDecl>(D)) 755 return ExprError(Diag(Loc, diag::err_unexpected_typedef) << Name); 756 if (isa<ObjCInterfaceDecl>(D)) 757 return ExprError(Diag(Loc, diag::err_unexpected_interface) << Name); 758 if (isa<NamespaceDecl>(D)) 759 return ExprError(Diag(Loc, diag::err_unexpected_namespace) << Name); 760 761 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 762 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 763 return Owned(BuildDeclRefExpr(Ovl, Context.OverloadTy, Loc, 764 false, false, SS)); 765 else if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 766 return Owned(BuildDeclRefExpr(Template, Context.OverloadTy, Loc, 767 false, false, SS)); 768 ValueDecl *VD = cast<ValueDecl>(D); 769 770 // Check if referencing an identifier with __attribute__((deprecated)). 771 DiagnoseUseOfDeprecatedDecl(VD, Loc); 772 773 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 774 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 775 Scope *CheckS = S; 776 while (CheckS) { 777 if (CheckS->isWithinElse() && 778 CheckS->getControlParent()->isDeclScope(Var)) { 779 if (Var->getType()->isBooleanType()) 780 ExprError(Diag(Loc, diag::warn_value_always_false) 781 << Var->getDeclName()); 782 else 783 ExprError(Diag(Loc, diag::warn_value_always_zero) 784 << Var->getDeclName()); 785 break; 786 } 787 788 // Move up one more control parent to check again. 789 CheckS = CheckS->getControlParent(); 790 if (CheckS) 791 CheckS = CheckS->getParent(); 792 } 793 } 794 } 795 796 // Only create DeclRefExpr's for valid Decl's. 797 if (VD->isInvalidDecl()) 798 return ExprError(); 799 800 // If the identifier reference is inside a block, and it refers to a value 801 // that is outside the block, create a BlockDeclRefExpr instead of a 802 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 803 // the block is formed. 804 // 805 // We do not do this for things like enum constants, global variables, etc, 806 // as they do not get snapshotted. 807 // 808 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 809 // The BlocksAttr indicates the variable is bound by-reference. 810 if (VD->getAttr<BlocksAttr>()) 811 return Owned(new (Context) BlockDeclRefExpr(VD, 812 VD->getType().getNonReferenceType(), Loc, true)); 813 814 // Variable will be bound by-copy, make it const within the closure. 815 VD->getType().addConst(); 816 return Owned(new (Context) BlockDeclRefExpr(VD, 817 VD->getType().getNonReferenceType(), Loc, false)); 818 } 819 // If this reference is not in a block or if the referenced variable is 820 // within the block, create a normal DeclRefExpr. 821 822 bool TypeDependent = false; 823 bool ValueDependent = false; 824 if (getLangOptions().CPlusPlus) { 825 // C++ [temp.dep.expr]p3: 826 // An id-expression is type-dependent if it contains: 827 // - an identifier that was declared with a dependent type, 828 if (VD->getType()->isDependentType()) 829 TypeDependent = true; 830 // - FIXME: a template-id that is dependent, 831 // - a conversion-function-id that specifies a dependent type, 832 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 833 Name.getCXXNameType()->isDependentType()) 834 TypeDependent = true; 835 // - a nested-name-specifier that contains a class-name that 836 // names a dependent type. 837 else if (SS && !SS->isEmpty()) { 838 for (DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 839 DC; DC = DC->getParent()) { 840 // FIXME: could stop early at namespace scope. 841 if (DC->isRecord()) { 842 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 843 if (Context.getTypeDeclType(Record)->isDependentType()) { 844 TypeDependent = true; 845 break; 846 } 847 } 848 } 849 } 850 851 // C++ [temp.dep.constexpr]p2: 852 // 853 // An identifier is value-dependent if it is: 854 // - a name declared with a dependent type, 855 if (TypeDependent) 856 ValueDependent = true; 857 // - the name of a non-type template parameter, 858 else if (isa<NonTypeTemplateParmDecl>(VD)) 859 ValueDependent = true; 860 // - a constant with integral or enumeration type and is 861 // initialized with an expression that is value-dependent 862 // (FIXME!). 863 } 864 865 return Owned(BuildDeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 866 TypeDependent, ValueDependent, SS)); 867} 868 869Sema::OwningExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 870 tok::TokenKind Kind) { 871 PredefinedExpr::IdentType IT; 872 873 switch (Kind) { 874 default: assert(0 && "Unknown simple primary expr!"); 875 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 876 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 877 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 878 } 879 880 // Pre-defined identifiers are of type char[x], where x is the length of the 881 // string. 882 unsigned Length; 883 if (FunctionDecl *FD = getCurFunctionDecl()) 884 Length = FD->getIdentifier()->getLength(); 885 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 886 Length = MD->getSynthesizedMethodSize(); 887 else { 888 Diag(Loc, diag::ext_predef_outside_function); 889 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 890 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 891 } 892 893 894 llvm::APInt LengthI(32, Length + 1); 895 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 896 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 897 return Owned(new (Context) PredefinedExpr(Loc, ResTy, IT)); 898} 899 900Sema::OwningExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 901 llvm::SmallString<16> CharBuffer; 902 CharBuffer.resize(Tok.getLength()); 903 const char *ThisTokBegin = &CharBuffer[0]; 904 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 905 906 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 907 Tok.getLocation(), PP); 908 if (Literal.hadError()) 909 return ExprError(); 910 911 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 912 913 return Owned(new (Context) CharacterLiteral(Literal.getValue(), 914 Literal.isWide(), 915 type, Tok.getLocation())); 916} 917 918Action::OwningExprResult Sema::ActOnNumericConstant(const Token &Tok) { 919 // Fast path for a single digit (which is quite common). A single digit 920 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 921 if (Tok.getLength() == 1) { 922 const char Val = PP.getSpellingOfSingleCharacterNumericConstant(Tok); 923 unsigned IntSize = Context.Target.getIntWidth(); 924 return Owned(new (Context) IntegerLiteral(llvm::APInt(IntSize, Val-'0'), 925 Context.IntTy, Tok.getLocation())); 926 } 927 928 llvm::SmallString<512> IntegerBuffer; 929 // Add padding so that NumericLiteralParser can overread by one character. 930 IntegerBuffer.resize(Tok.getLength()+1); 931 const char *ThisTokBegin = &IntegerBuffer[0]; 932 933 // Get the spelling of the token, which eliminates trigraphs, etc. 934 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 935 936 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 937 Tok.getLocation(), PP); 938 if (Literal.hadError) 939 return ExprError(); 940 941 Expr *Res; 942 943 if (Literal.isFloatingLiteral()) { 944 QualType Ty; 945 if (Literal.isFloat) 946 Ty = Context.FloatTy; 947 else if (!Literal.isLong) 948 Ty = Context.DoubleTy; 949 else 950 Ty = Context.LongDoubleTy; 951 952 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 953 954 // isExact will be set by GetFloatValue(). 955 bool isExact = false; 956 Res = new (Context) FloatingLiteral(Literal.GetFloatValue(Format, &isExact), 957 &isExact, Ty, Tok.getLocation()); 958 959 } else if (!Literal.isIntegerLiteral()) { 960 return ExprError(); 961 } else { 962 QualType Ty; 963 964 // long long is a C99 feature. 965 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 966 Literal.isLongLong) 967 Diag(Tok.getLocation(), diag::ext_longlong); 968 969 // Get the value in the widest-possible width. 970 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 971 972 if (Literal.GetIntegerValue(ResultVal)) { 973 // If this value didn't fit into uintmax_t, warn and force to ull. 974 Diag(Tok.getLocation(), diag::warn_integer_too_large); 975 Ty = Context.UnsignedLongLongTy; 976 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 977 "long long is not intmax_t?"); 978 } else { 979 // If this value fits into a ULL, try to figure out what else it fits into 980 // according to the rules of C99 6.4.4.1p5. 981 982 // Octal, Hexadecimal, and integers with a U suffix are allowed to 983 // be an unsigned int. 984 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 985 986 // Check from smallest to largest, picking the smallest type we can. 987 unsigned Width = 0; 988 if (!Literal.isLong && !Literal.isLongLong) { 989 // Are int/unsigned possibilities? 990 unsigned IntSize = Context.Target.getIntWidth(); 991 992 // Does it fit in a unsigned int? 993 if (ResultVal.isIntN(IntSize)) { 994 // Does it fit in a signed int? 995 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 996 Ty = Context.IntTy; 997 else if (AllowUnsigned) 998 Ty = Context.UnsignedIntTy; 999 Width = IntSize; 1000 } 1001 } 1002 1003 // Are long/unsigned long possibilities? 1004 if (Ty.isNull() && !Literal.isLongLong) { 1005 unsigned LongSize = Context.Target.getLongWidth(); 1006 1007 // Does it fit in a unsigned long? 1008 if (ResultVal.isIntN(LongSize)) { 1009 // Does it fit in a signed long? 1010 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 1011 Ty = Context.LongTy; 1012 else if (AllowUnsigned) 1013 Ty = Context.UnsignedLongTy; 1014 Width = LongSize; 1015 } 1016 } 1017 1018 // Finally, check long long if needed. 1019 if (Ty.isNull()) { 1020 unsigned LongLongSize = Context.Target.getLongLongWidth(); 1021 1022 // Does it fit in a unsigned long long? 1023 if (ResultVal.isIntN(LongLongSize)) { 1024 // Does it fit in a signed long long? 1025 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 1026 Ty = Context.LongLongTy; 1027 else if (AllowUnsigned) 1028 Ty = Context.UnsignedLongLongTy; 1029 Width = LongLongSize; 1030 } 1031 } 1032 1033 // If we still couldn't decide a type, we probably have something that 1034 // does not fit in a signed long long, but has no U suffix. 1035 if (Ty.isNull()) { 1036 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 1037 Ty = Context.UnsignedLongLongTy; 1038 Width = Context.Target.getLongLongWidth(); 1039 } 1040 1041 if (ResultVal.getBitWidth() != Width) 1042 ResultVal.trunc(Width); 1043 } 1044 Res = new (Context) IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 1045 } 1046 1047 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 1048 if (Literal.isImaginary) 1049 Res = new (Context) ImaginaryLiteral(Res, 1050 Context.getComplexType(Res->getType())); 1051 1052 return Owned(Res); 1053} 1054 1055Action::OwningExprResult Sema::ActOnParenExpr(SourceLocation L, 1056 SourceLocation R, ExprArg Val) { 1057 Expr *E = (Expr *)Val.release(); 1058 assert((E != 0) && "ActOnParenExpr() missing expr"); 1059 return Owned(new (Context) ParenExpr(L, R, E)); 1060} 1061 1062/// The UsualUnaryConversions() function is *not* called by this routine. 1063/// See C99 6.3.2.1p[2-4] for more details. 1064bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 1065 SourceLocation OpLoc, 1066 const SourceRange &ExprRange, 1067 bool isSizeof) { 1068 // C99 6.5.3.4p1: 1069 if (isa<FunctionType>(exprType)) { 1070 // alignof(function) is allowed. 1071 if (isSizeof) 1072 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 1073 return false; 1074 } 1075 1076 if (exprType->isVoidType()) { 1077 Diag(OpLoc, diag::ext_sizeof_void_type) 1078 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 1079 return false; 1080 } 1081 1082 return DiagnoseIncompleteType(OpLoc, exprType, 1083 isSizeof ? diag::err_sizeof_incomplete_type : 1084 diag::err_alignof_incomplete_type, 1085 ExprRange); 1086} 1087 1088bool Sema::CheckAlignOfExpr(Expr *E, SourceLocation OpLoc, 1089 const SourceRange &ExprRange) { 1090 E = E->IgnoreParens(); 1091 1092 // alignof decl is always ok. 1093 if (isa<DeclRefExpr>(E)) 1094 return false; 1095 1096 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1097 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) { 1098 if (FD->isBitField()) { 1099 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 1 << ExprRange; 1100 return true; 1101 } 1102 // Other fields are ok. 1103 return false; 1104 } 1105 } 1106 return CheckSizeOfAlignOfOperand(E->getType(), OpLoc, ExprRange, false); 1107} 1108 1109/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 1110/// the same for @c alignof and @c __alignof 1111/// Note that the ArgRange is invalid if isType is false. 1112Action::OwningExprResult 1113Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 1114 void *TyOrEx, const SourceRange &ArgRange) { 1115 // If error parsing type, ignore. 1116 if (TyOrEx == 0) return ExprError(); 1117 1118 QualType ArgTy; 1119 SourceRange Range; 1120 if (isType) { 1121 ArgTy = QualType::getFromOpaquePtr(TyOrEx); 1122 Range = ArgRange; 1123 1124 // Verify that the operand is valid. 1125 if (CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, isSizeof)) 1126 return ExprError(); 1127 } else { 1128 // Get the end location. 1129 Expr *ArgEx = (Expr *)TyOrEx; 1130 Range = ArgEx->getSourceRange(); 1131 ArgTy = ArgEx->getType(); 1132 1133 // Verify that the operand is valid. 1134 bool isInvalid; 1135 if (!isSizeof) { 1136 isInvalid = CheckAlignOfExpr(ArgEx, OpLoc, Range); 1137 } else if (ArgEx->isBitField()) { // C99 6.5.3.4p1. 1138 Diag(OpLoc, diag::err_sizeof_alignof_bitfield) << 0; 1139 isInvalid = true; 1140 } else { 1141 isInvalid = CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, true); 1142 } 1143 1144 if (isInvalid) { 1145 DeleteExpr(ArgEx); 1146 return ExprError(); 1147 } 1148 } 1149 1150 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 1151 return Owned(new (Context) SizeOfAlignOfExpr(isSizeof, isType, TyOrEx, 1152 Context.getSizeType(), OpLoc, 1153 Range.getEnd())); 1154} 1155 1156QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 1157 DefaultFunctionArrayConversion(V); 1158 1159 // These operators return the element type of a complex type. 1160 if (const ComplexType *CT = V->getType()->getAsComplexType()) 1161 return CT->getElementType(); 1162 1163 // Otherwise they pass through real integer and floating point types here. 1164 if (V->getType()->isArithmeticType()) 1165 return V->getType(); 1166 1167 // Reject anything else. 1168 Diag(Loc, diag::err_realimag_invalid_type) << V->getType(); 1169 return QualType(); 1170} 1171 1172 1173 1174Action::OwningExprResult 1175Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 1176 tok::TokenKind Kind, ExprArg Input) { 1177 Expr *Arg = (Expr *)Input.get(); 1178 1179 UnaryOperator::Opcode Opc; 1180 switch (Kind) { 1181 default: assert(0 && "Unknown unary op!"); 1182 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 1183 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 1184 } 1185 1186 if (getLangOptions().CPlusPlus && 1187 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 1188 // Which overloaded operator? 1189 OverloadedOperatorKind OverOp = 1190 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 1191 1192 // C++ [over.inc]p1: 1193 // 1194 // [...] If the function is a member function with one 1195 // parameter (which shall be of type int) or a non-member 1196 // function with two parameters (the second of which shall be 1197 // of type int), it defines the postfix increment operator ++ 1198 // for objects of that type. When the postfix increment is 1199 // called as a result of using the ++ operator, the int 1200 // argument will have value zero. 1201 Expr *Args[2] = { 1202 Arg, 1203 new (Context) IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 1204 /*isSigned=*/true), Context.IntTy, SourceLocation()) 1205 }; 1206 1207 // Build the candidate set for overloading 1208 OverloadCandidateSet CandidateSet; 1209 if (AddOperatorCandidates(OverOp, S, OpLoc, Args, 2, CandidateSet)) 1210 return ExprError(); 1211 1212 // Perform overload resolution. 1213 OverloadCandidateSet::iterator Best; 1214 switch (BestViableFunction(CandidateSet, Best)) { 1215 case OR_Success: { 1216 // We found a built-in operator or an overloaded operator. 1217 FunctionDecl *FnDecl = Best->Function; 1218 1219 if (FnDecl) { 1220 // We matched an overloaded operator. Build a call to that 1221 // operator. 1222 1223 // Convert the arguments. 1224 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1225 if (PerformObjectArgumentInitialization(Arg, Method)) 1226 return ExprError(); 1227 } else { 1228 // Convert the arguments. 1229 if (PerformCopyInitialization(Arg, 1230 FnDecl->getParamDecl(0)->getType(), 1231 "passing")) 1232 return ExprError(); 1233 } 1234 1235 // Determine the result type 1236 QualType ResultTy 1237 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1238 ResultTy = ResultTy.getNonReferenceType(); 1239 1240 // Build the actual expression node. 1241 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1242 SourceLocation()); 1243 UsualUnaryConversions(FnExpr); 1244 1245 Input.release(); 1246 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 1247 ResultTy, OpLoc)); 1248 } else { 1249 // We matched a built-in operator. Convert the arguments, then 1250 // break out so that we will build the appropriate built-in 1251 // operator node. 1252 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 1253 "passing")) 1254 return ExprError(); 1255 1256 break; 1257 } 1258 } 1259 1260 case OR_No_Viable_Function: 1261 // No viable function; fall through to handling this as a 1262 // built-in operator, which will produce an error message for us. 1263 break; 1264 1265 case OR_Ambiguous: 1266 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 1267 << UnaryOperator::getOpcodeStr(Opc) 1268 << Arg->getSourceRange(); 1269 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1270 return ExprError(); 1271 } 1272 1273 // Either we found no viable overloaded operator or we matched a 1274 // built-in operator. In either case, fall through to trying to 1275 // build a built-in operation. 1276 } 1277 1278 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1279 Opc == UnaryOperator::PostInc); 1280 if (result.isNull()) 1281 return ExprError(); 1282 Input.release(); 1283 return Owned(new (Context) UnaryOperator(Arg, Opc, result, OpLoc)); 1284} 1285 1286Action::OwningExprResult 1287Sema::ActOnArraySubscriptExpr(Scope *S, ExprArg Base, SourceLocation LLoc, 1288 ExprArg Idx, SourceLocation RLoc) { 1289 Expr *LHSExp = static_cast<Expr*>(Base.get()), 1290 *RHSExp = static_cast<Expr*>(Idx.get()); 1291 1292 if (getLangOptions().CPlusPlus && 1293 (LHSExp->getType()->isRecordType() || 1294 LHSExp->getType()->isEnumeralType() || 1295 RHSExp->getType()->isRecordType() || 1296 RHSExp->getType()->isEnumeralType())) { 1297 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1298 // to the candidate set. 1299 OverloadCandidateSet CandidateSet; 1300 Expr *Args[2] = { LHSExp, RHSExp }; 1301 if (AddOperatorCandidates(OO_Subscript, S, LLoc, Args, 2, CandidateSet, 1302 SourceRange(LLoc, RLoc))) 1303 return ExprError(); 1304 1305 // Perform overload resolution. 1306 OverloadCandidateSet::iterator Best; 1307 switch (BestViableFunction(CandidateSet, Best)) { 1308 case OR_Success: { 1309 // We found a built-in operator or an overloaded operator. 1310 FunctionDecl *FnDecl = Best->Function; 1311 1312 if (FnDecl) { 1313 // We matched an overloaded operator. Build a call to that 1314 // operator. 1315 1316 // Convert the arguments. 1317 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1318 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1319 PerformCopyInitialization(RHSExp, 1320 FnDecl->getParamDecl(0)->getType(), 1321 "passing")) 1322 return ExprError(); 1323 } else { 1324 // Convert the arguments. 1325 if (PerformCopyInitialization(LHSExp, 1326 FnDecl->getParamDecl(0)->getType(), 1327 "passing") || 1328 PerformCopyInitialization(RHSExp, 1329 FnDecl->getParamDecl(1)->getType(), 1330 "passing")) 1331 return ExprError(); 1332 } 1333 1334 // Determine the result type 1335 QualType ResultTy 1336 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1337 ResultTy = ResultTy.getNonReferenceType(); 1338 1339 // Build the actual expression node. 1340 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 1341 SourceLocation()); 1342 UsualUnaryConversions(FnExpr); 1343 1344 Base.release(); 1345 Idx.release(); 1346 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 1347 ResultTy, LLoc)); 1348 } else { 1349 // We matched a built-in operator. Convert the arguments, then 1350 // break out so that we will build the appropriate built-in 1351 // operator node. 1352 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1353 "passing") || 1354 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1355 "passing")) 1356 return ExprError(); 1357 1358 break; 1359 } 1360 } 1361 1362 case OR_No_Viable_Function: 1363 // No viable function; fall through to handling this as a 1364 // built-in operator, which will produce an error message for us. 1365 break; 1366 1367 case OR_Ambiguous: 1368 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1369 << "[]" 1370 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1371 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1372 return ExprError(); 1373 } 1374 1375 // Either we found no viable overloaded operator or we matched a 1376 // built-in operator. In either case, fall through to trying to 1377 // build a built-in operation. 1378 } 1379 1380 // Perform default conversions. 1381 DefaultFunctionArrayConversion(LHSExp); 1382 DefaultFunctionArrayConversion(RHSExp); 1383 1384 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1385 1386 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1387 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1388 // in the subscript position. As a result, we need to derive the array base 1389 // and index from the expression types. 1390 Expr *BaseExpr, *IndexExpr; 1391 QualType ResultType; 1392 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1393 BaseExpr = LHSExp; 1394 IndexExpr = RHSExp; 1395 // FIXME: need to deal with const... 1396 ResultType = PTy->getPointeeType(); 1397 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1398 // Handle the uncommon case of "123[Ptr]". 1399 BaseExpr = RHSExp; 1400 IndexExpr = LHSExp; 1401 // FIXME: need to deal with const... 1402 ResultType = PTy->getPointeeType(); 1403 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1404 BaseExpr = LHSExp; // vectors: V[123] 1405 IndexExpr = RHSExp; 1406 1407 // FIXME: need to deal with const... 1408 ResultType = VTy->getElementType(); 1409 } else { 1410 return ExprError(Diag(LHSExp->getLocStart(), 1411 diag::err_typecheck_subscript_value) << RHSExp->getSourceRange()); 1412 } 1413 // C99 6.5.2.1p1 1414 if (!IndexExpr->getType()->isIntegerType()) 1415 return ExprError(Diag(IndexExpr->getLocStart(), 1416 diag::err_typecheck_subscript) << IndexExpr->getSourceRange()); 1417 1418 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 1419 // the following check catches trying to index a pointer to a function (e.g. 1420 // void (*)(int)) and pointers to incomplete types. Functions are not 1421 // objects in C99. 1422 if (!ResultType->isObjectType()) 1423 return ExprError(Diag(BaseExpr->getLocStart(), 1424 diag::err_typecheck_subscript_not_object) 1425 << BaseExpr->getType() << BaseExpr->getSourceRange()); 1426 1427 Base.release(); 1428 Idx.release(); 1429 return Owned(new (Context) ArraySubscriptExpr(LHSExp, RHSExp, 1430 ResultType, RLoc)); 1431} 1432 1433QualType Sema:: 1434CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1435 IdentifierInfo &CompName, SourceLocation CompLoc) { 1436 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1437 1438 // The vector accessor can't exceed the number of elements. 1439 const char *compStr = CompName.getName(); 1440 1441 // This flag determines whether or not the component is one of the four 1442 // special names that indicate a subset of exactly half the elements are 1443 // to be selected. 1444 bool HalvingSwizzle = false; 1445 1446 // This flag determines whether or not CompName has an 's' char prefix, 1447 // indicating that it is a string of hex values to be used as vector indices. 1448 bool HexSwizzle = *compStr == 's'; 1449 1450 // Check that we've found one of the special components, or that the component 1451 // names must come from the same set. 1452 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1453 !strcmp(compStr, "even") || !strcmp(compStr, "odd")) { 1454 HalvingSwizzle = true; 1455 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1456 do 1457 compStr++; 1458 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1459 } else if (HexSwizzle || vecType->getNumericAccessorIdx(*compStr) != -1) { 1460 do 1461 compStr++; 1462 while (*compStr && vecType->getNumericAccessorIdx(*compStr) != -1); 1463 } 1464 1465 if (!HalvingSwizzle && *compStr) { 1466 // We didn't get to the end of the string. This means the component names 1467 // didn't come from the same set *or* we encountered an illegal name. 1468 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1469 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1470 return QualType(); 1471 } 1472 1473 // Ensure no component accessor exceeds the width of the vector type it 1474 // operates on. 1475 if (!HalvingSwizzle) { 1476 compStr = CompName.getName(); 1477 1478 if (HexSwizzle) 1479 compStr++; 1480 1481 while (*compStr) { 1482 if (!vecType->isAccessorWithinNumElements(*compStr++)) { 1483 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1484 << baseType << SourceRange(CompLoc); 1485 return QualType(); 1486 } 1487 } 1488 } 1489 1490 // If this is a halving swizzle, verify that the base type has an even 1491 // number of elements. 1492 if (HalvingSwizzle && (vecType->getNumElements() & 1U)) { 1493 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1494 << baseType << SourceRange(CompLoc); 1495 return QualType(); 1496 } 1497 1498 // The component accessor looks fine - now we need to compute the actual type. 1499 // The vector type is implied by the component accessor. For example, 1500 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1501 // vec4.s0 is a float, vec4.s23 is a vec3, etc. 1502 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1503 unsigned CompSize = HalvingSwizzle ? vecType->getNumElements() / 2 1504 : CompName.getLength(); 1505 if (HexSwizzle) 1506 CompSize--; 1507 1508 if (CompSize == 1) 1509 return vecType->getElementType(); 1510 1511 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1512 // Now look up the TypeDefDecl from the vector type. Without this, 1513 // diagostics look bad. We want extended vector types to appear built-in. 1514 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1515 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1516 return Context.getTypedefType(ExtVectorDecls[i]); 1517 } 1518 return VT; // should never get here (a typedef type should always be found). 1519} 1520 1521 1522/// constructSetterName - Return the setter name for the given 1523/// identifier, i.e. "set" + Name where the initial character of Name 1524/// has been capitalized. 1525// FIXME: Merge with same routine in Parser. But where should this 1526// live? 1527static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 1528 const IdentifierInfo *Name) { 1529 llvm::SmallString<100> SelectorName; 1530 SelectorName = "set"; 1531 SelectorName.append(Name->getName(), Name->getName()+Name->getLength()); 1532 SelectorName[3] = toupper(SelectorName[3]); 1533 return &Idents.get(&SelectorName[0], &SelectorName[SelectorName.size()]); 1534} 1535 1536Action::OwningExprResult 1537Sema::ActOnMemberReferenceExpr(Scope *S, ExprArg Base, SourceLocation OpLoc, 1538 tok::TokenKind OpKind, SourceLocation MemberLoc, 1539 IdentifierInfo &Member) { 1540 Expr *BaseExpr = static_cast<Expr *>(Base.release()); 1541 assert(BaseExpr && "no record expression"); 1542 1543 // Perform default conversions. 1544 DefaultFunctionArrayConversion(BaseExpr); 1545 1546 QualType BaseType = BaseExpr->getType(); 1547 assert(!BaseType.isNull() && "no type for member expression"); 1548 1549 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1550 // must have pointer type, and the accessed type is the pointee. 1551 if (OpKind == tok::arrow) { 1552 if (const PointerType *PT = BaseType->getAsPointerType()) 1553 BaseType = PT->getPointeeType(); 1554 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1555 return Owned(BuildOverloadedArrowExpr(S, BaseExpr, OpLoc, 1556 MemberLoc, Member)); 1557 else 1558 return ExprError(Diag(MemberLoc, 1559 diag::err_typecheck_member_reference_arrow) 1560 << BaseType << BaseExpr->getSourceRange()); 1561 } 1562 1563 // Handle field access to simple records. This also handles access to fields 1564 // of the ObjC 'id' struct. 1565 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1566 RecordDecl *RDecl = RTy->getDecl(); 1567 if (DiagnoseIncompleteType(OpLoc, BaseType, 1568 diag::err_typecheck_incomplete_tag, 1569 BaseExpr->getSourceRange())) 1570 return ExprError(); 1571 1572 // The record definition is complete, now make sure the member is valid. 1573 // FIXME: Qualified name lookup for C++ is a bit more complicated 1574 // than this. 1575 LookupResult Result 1576 = LookupQualifiedName(RDecl, DeclarationName(&Member), 1577 LookupMemberName, false); 1578 1579 NamedDecl *MemberDecl = 0; 1580 if (!Result) 1581 return ExprError(Diag(MemberLoc, diag::err_typecheck_no_member) 1582 << &Member << BaseExpr->getSourceRange()); 1583 else if (Result.isAmbiguous()) { 1584 DiagnoseAmbiguousLookup(Result, DeclarationName(&Member), 1585 MemberLoc, BaseExpr->getSourceRange()); 1586 return ExprError(); 1587 } else 1588 MemberDecl = Result; 1589 1590 // If the decl being referenced had an error, return an error for this 1591 // sub-expr without emitting another error, in order to avoid cascading 1592 // error cases. 1593 if (MemberDecl->isInvalidDecl()) 1594 return ExprError(); 1595 1596 if (FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl)) { 1597 // We may have found a field within an anonymous union or struct 1598 // (C++ [class.union]). 1599 if (cast<RecordDecl>(FD->getDeclContext())->isAnonymousStructOrUnion()) 1600 return BuildAnonymousStructUnionMemberReference(MemberLoc, FD, 1601 BaseExpr, OpLoc); 1602 1603 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1604 // FIXME: Handle address space modifiers 1605 QualType MemberType = FD->getType(); 1606 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1607 MemberType = Ref->getPointeeType(); 1608 else { 1609 unsigned combinedQualifiers = 1610 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1611 if (FD->isMutable()) 1612 combinedQualifiers &= ~QualType::Const; 1613 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1614 } 1615 1616 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, FD, 1617 MemberLoc, MemberType)); 1618 } else if (CXXClassVarDecl *Var = dyn_cast<CXXClassVarDecl>(MemberDecl)) 1619 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1620 Var, MemberLoc, 1621 Var->getType().getNonReferenceType())); 1622 else if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(MemberDecl)) 1623 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, 1624 MemberFn, MemberLoc, MemberFn->getType())); 1625 else if (OverloadedFunctionDecl *Ovl 1626 = dyn_cast<OverloadedFunctionDecl>(MemberDecl)) 1627 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, 1628 MemberLoc, Context.OverloadTy)); 1629 else if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(MemberDecl)) 1630 return Owned(new (Context) MemberExpr(BaseExpr, OpKind == tok::arrow, Enum, 1631 MemberLoc, Enum->getType())); 1632 else if (isa<TypeDecl>(MemberDecl)) 1633 return ExprError(Diag(MemberLoc,diag::err_typecheck_member_reference_type) 1634 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1635 1636 // We found a declaration kind that we didn't expect. This is a 1637 // generic error message that tells the user that she can't refer 1638 // to this member with '.' or '->'. 1639 return ExprError(Diag(MemberLoc, 1640 diag::err_typecheck_member_reference_unknown) 1641 << DeclarationName(&Member) << int(OpKind == tok::arrow)); 1642 } 1643 1644 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1645 // (*Obj).ivar. 1646 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1647 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) { 1648 // If the decl being referenced had an error, return an error for this 1649 // sub-expr without emitting another error, in order to avoid cascading 1650 // error cases. 1651 if (IV->isInvalidDecl()) 1652 return ExprError(); 1653 1654 ObjCIvarRefExpr *MRef= new (Context) ObjCIvarRefExpr(IV, IV->getType(), 1655 MemberLoc, BaseExpr, 1656 OpKind == tok::arrow); 1657 Context.setFieldDecl(IFTy->getDecl(), IV, MRef); 1658 return Owned(MRef); 1659 } 1660 return ExprError(Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1661 << IFTy->getDecl()->getDeclName() << &Member 1662 << BaseExpr->getSourceRange()); 1663 } 1664 1665 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1666 // pointer to a (potentially qualified) interface type. 1667 const PointerType *PTy; 1668 const ObjCInterfaceType *IFTy; 1669 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1670 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1671 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1672 1673 // Search for a declared property first. 1674 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 1675 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1676 MemberLoc, BaseExpr)); 1677 1678 // Check protocols on qualified interfaces. 1679 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1680 E = IFTy->qual_end(); I != E; ++I) 1681 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1682 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1683 MemberLoc, BaseExpr)); 1684 1685 // If that failed, look for an "implicit" property by seeing if the nullary 1686 // selector is implemented. 1687 1688 // FIXME: The logic for looking up nullary and unary selectors should be 1689 // shared with the code in ActOnInstanceMessage. 1690 1691 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1692 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1693 1694 // If this reference is in an @implementation, check for 'private' methods. 1695 if (!Getter) 1696 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1697 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1698 if (ObjCImplementationDecl *ImpDecl = 1699 ObjCImplementations[ClassDecl->getIdentifier()]) 1700 Getter = ImpDecl->getInstanceMethod(Sel); 1701 1702 // Look through local category implementations associated with the class. 1703 if (!Getter) { 1704 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1705 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1706 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1707 } 1708 } 1709 if (Getter) { 1710 // If we found a getter then this may be a valid dot-reference, we 1711 // will look for the matching setter, in case it is needed. 1712 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 1713 &Member); 1714 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 1715 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1716 if (!Setter) { 1717 // If this reference is in an @implementation, also check for 'private' 1718 // methods. 1719 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1720 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1721 if (ObjCImplementationDecl *ImpDecl = 1722 ObjCImplementations[ClassDecl->getIdentifier()]) 1723 Setter = ImpDecl->getInstanceMethod(SetterSel); 1724 } 1725 // Look through local category implementations associated with the class. 1726 if (!Setter) { 1727 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 1728 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1729 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 1730 } 1731 } 1732 1733 // FIXME: we must check that the setter has property type. 1734 return Owned(new (Context) ObjCKVCRefExpr(Getter, Getter->getResultType(), 1735 Setter, MemberLoc, BaseExpr)); 1736 } 1737 1738 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 1739 << &Member << BaseType); 1740 } 1741 // Handle properties on qualified "id" protocols. 1742 const ObjCQualifiedIdType *QIdTy; 1743 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1744 // Check protocols on qualified interfaces. 1745 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1746 E = QIdTy->qual_end(); I != E; ++I) { 1747 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1748 return Owned(new (Context) ObjCPropertyRefExpr(PD, PD->getType(), 1749 MemberLoc, BaseExpr)); 1750 // Also must look for a getter name which uses property syntax. 1751 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1752 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1753 return Owned(new (Context) ObjCMessageExpr(BaseExpr, Sel, 1754 OMD->getResultType(), OMD, OpLoc, MemberLoc, NULL, 0)); 1755 } 1756 } 1757 1758 return ExprError(Diag(MemberLoc, diag::err_property_not_found) 1759 << &Member << BaseType); 1760 } 1761 // Handle 'field access' to vectors, such as 'V.xx'. 1762 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1763 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1764 if (ret.isNull()) 1765 return ExprError(); 1766 return Owned(new (Context) ExtVectorElementExpr(ret, BaseExpr, Member, 1767 MemberLoc)); 1768 } 1769 1770 return ExprError(Diag(MemberLoc, 1771 diag::err_typecheck_member_reference_struct_union) 1772 << BaseType << BaseExpr->getSourceRange()); 1773} 1774 1775/// ConvertArgumentsForCall - Converts the arguments specified in 1776/// Args/NumArgs to the parameter types of the function FDecl with 1777/// function prototype Proto. Call is the call expression itself, and 1778/// Fn is the function expression. For a C++ member function, this 1779/// routine does not attempt to convert the object argument. Returns 1780/// true if the call is ill-formed. 1781bool 1782Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 1783 FunctionDecl *FDecl, 1784 const FunctionTypeProto *Proto, 1785 Expr **Args, unsigned NumArgs, 1786 SourceLocation RParenLoc) { 1787 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1788 // assignment, to the types of the corresponding parameter, ... 1789 unsigned NumArgsInProto = Proto->getNumArgs(); 1790 unsigned NumArgsToCheck = NumArgs; 1791 bool Invalid = false; 1792 1793 // If too few arguments are available (and we don't have default 1794 // arguments for the remaining parameters), don't make the call. 1795 if (NumArgs < NumArgsInProto) { 1796 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 1797 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 1798 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 1799 // Use default arguments for missing arguments 1800 NumArgsToCheck = NumArgsInProto; 1801 Call->setNumArgs(Context, NumArgsInProto); 1802 } 1803 1804 // If too many are passed and not variadic, error on the extras and drop 1805 // them. 1806 if (NumArgs > NumArgsInProto) { 1807 if (!Proto->isVariadic()) { 1808 Diag(Args[NumArgsInProto]->getLocStart(), 1809 diag::err_typecheck_call_too_many_args) 1810 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 1811 << SourceRange(Args[NumArgsInProto]->getLocStart(), 1812 Args[NumArgs-1]->getLocEnd()); 1813 // This deletes the extra arguments. 1814 Call->setNumArgs(Context, NumArgsInProto); 1815 Invalid = true; 1816 } 1817 NumArgsToCheck = NumArgsInProto; 1818 } 1819 1820 // Continue to check argument types (even if we have too few/many args). 1821 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1822 QualType ProtoArgType = Proto->getArgType(i); 1823 1824 Expr *Arg; 1825 if (i < NumArgs) { 1826 Arg = Args[i]; 1827 1828 // Pass the argument. 1829 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 1830 return true; 1831 } else 1832 // We already type-checked the argument, so we know it works. 1833 Arg = new (Context) CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1834 QualType ArgType = Arg->getType(); 1835 1836 Call->setArg(i, Arg); 1837 } 1838 1839 // If this is a variadic call, handle args passed through "...". 1840 if (Proto->isVariadic()) { 1841 VariadicCallType CallType = VariadicFunction; 1842 if (Fn->getType()->isBlockPointerType()) 1843 CallType = VariadicBlock; // Block 1844 else if (isa<MemberExpr>(Fn)) 1845 CallType = VariadicMethod; 1846 1847 // Promote the arguments (C99 6.5.2.2p7). 1848 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1849 Expr *Arg = Args[i]; 1850 DefaultVariadicArgumentPromotion(Arg, CallType); 1851 Call->setArg(i, Arg); 1852 } 1853 } 1854 1855 return Invalid; 1856} 1857 1858/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1859/// This provides the location of the left/right parens and a list of comma 1860/// locations. 1861Action::OwningExprResult 1862Sema::ActOnCallExpr(Scope *S, ExprArg fn, SourceLocation LParenLoc, 1863 MultiExprArg args, 1864 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1865 unsigned NumArgs = args.size(); 1866 Expr *Fn = static_cast<Expr *>(fn.release()); 1867 Expr **Args = reinterpret_cast<Expr**>(args.release()); 1868 assert(Fn && "no function call expression"); 1869 FunctionDecl *FDecl = NULL; 1870 DeclarationName UnqualifiedName; 1871 1872 if (getLangOptions().CPlusPlus) { 1873 // Determine whether this is a dependent call inside a C++ template, 1874 // in which case we won't do any semantic analysis now. 1875 // FIXME: Will need to cache the results of name lookup (including ADL) in Fn. 1876 bool Dependent = false; 1877 if (Fn->isTypeDependent()) 1878 Dependent = true; 1879 else if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 1880 Dependent = true; 1881 1882 if (Dependent) 1883 return Owned(new (Context) CallExpr(Context, Fn, Args, NumArgs, 1884 Context.DependentTy, RParenLoc)); 1885 1886 // Determine whether this is a call to an object (C++ [over.call.object]). 1887 if (Fn->getType()->isRecordType()) 1888 return Owned(BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 1889 CommaLocs, RParenLoc)); 1890 1891 // Determine whether this is a call to a member function. 1892 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 1893 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 1894 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 1895 return Owned(BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 1896 CommaLocs, RParenLoc)); 1897 } 1898 1899 // If we're directly calling a function, get the appropriate declaration. 1900 DeclRefExpr *DRExpr = NULL; 1901 Expr *FnExpr = Fn; 1902 bool ADL = true; 1903 while (true) { 1904 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(FnExpr)) 1905 FnExpr = IcExpr->getSubExpr(); 1906 else if (ParenExpr *PExpr = dyn_cast<ParenExpr>(FnExpr)) { 1907 // Parentheses around a function disable ADL 1908 // (C++0x [basic.lookup.argdep]p1). 1909 ADL = false; 1910 FnExpr = PExpr->getSubExpr(); 1911 } else if (isa<UnaryOperator>(FnExpr) && 1912 cast<UnaryOperator>(FnExpr)->getOpcode() 1913 == UnaryOperator::AddrOf) { 1914 FnExpr = cast<UnaryOperator>(FnExpr)->getSubExpr(); 1915 } else if ((DRExpr = dyn_cast<DeclRefExpr>(FnExpr))) { 1916 // Qualified names disable ADL (C++0x [basic.lookup.argdep]p1). 1917 ADL &= !isa<QualifiedDeclRefExpr>(DRExpr); 1918 break; 1919 } else if (UnresolvedFunctionNameExpr *DepName 1920 = dyn_cast<UnresolvedFunctionNameExpr>(FnExpr)) { 1921 UnqualifiedName = DepName->getName(); 1922 break; 1923 } else { 1924 // Any kind of name that does not refer to a declaration (or 1925 // set of declarations) disables ADL (C++0x [basic.lookup.argdep]p3). 1926 ADL = false; 1927 break; 1928 } 1929 } 1930 1931 OverloadedFunctionDecl *Ovl = 0; 1932 if (DRExpr) { 1933 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1934 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1935 } 1936 1937 if (Ovl || (getLangOptions().CPlusPlus && (FDecl || UnqualifiedName))) { 1938 // We don't perform ADL for implicit declarations of builtins. 1939 if (FDecl && FDecl->getBuiltinID(Context) && FDecl->isImplicit()) 1940 ADL = false; 1941 1942 // We don't perform ADL in C. 1943 if (!getLangOptions().CPlusPlus) 1944 ADL = false; 1945 1946 if (Ovl || ADL) { 1947 FDecl = ResolveOverloadedCallFn(Fn, DRExpr? DRExpr->getDecl() : 0, 1948 UnqualifiedName, LParenLoc, Args, 1949 NumArgs, CommaLocs, RParenLoc, ADL); 1950 if (!FDecl) 1951 return ExprError(); 1952 1953 // Update Fn to refer to the actual function selected. 1954 Expr *NewFn = 0; 1955 if (QualifiedDeclRefExpr *QDRExpr 1956 = dyn_cast_or_null<QualifiedDeclRefExpr>(DRExpr)) 1957 NewFn = new (Context) QualifiedDeclRefExpr(FDecl, FDecl->getType(), 1958 QDRExpr->getLocation(), 1959 false, false, 1960 QDRExpr->getSourceRange().getBegin()); 1961 else 1962 NewFn = new (Context) DeclRefExpr(FDecl, FDecl->getType(), 1963 Fn->getSourceRange().getBegin()); 1964 Fn->Destroy(Context); 1965 Fn = NewFn; 1966 } 1967 } 1968 1969 // Promote the function operand. 1970 UsualUnaryConversions(Fn); 1971 1972 // Make the call expr early, before semantic checks. This guarantees cleanup 1973 // of arguments and function on error. 1974 // FIXME: Except that llvm::OwningPtr uses delete, when it really must be 1975 // Destroy(), or nothing gets cleaned up. 1976 ExprOwningPtr<CallExpr> TheCall(this, new (Context) CallExpr(Context, Fn, 1977 Args, NumArgs, 1978 Context.BoolTy, 1979 RParenLoc)); 1980 1981 const FunctionType *FuncT; 1982 if (!Fn->getType()->isBlockPointerType()) { 1983 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1984 // have type pointer to function". 1985 const PointerType *PT = Fn->getType()->getAsPointerType(); 1986 if (PT == 0) 1987 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 1988 << Fn->getType() << Fn->getSourceRange()); 1989 FuncT = PT->getPointeeType()->getAsFunctionType(); 1990 } else { // This is a block call. 1991 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1992 getAsFunctionType(); 1993 } 1994 if (FuncT == 0) 1995 return ExprError(Diag(LParenLoc, diag::err_typecheck_call_not_function) 1996 << Fn->getType() << Fn->getSourceRange()); 1997 1998 // We know the result type of the call, set it. 1999 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 2000 2001 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 2002 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 2003 RParenLoc)) 2004 return ExprError(); 2005 } else { 2006 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 2007 2008 // Promote the arguments (C99 6.5.2.2p6). 2009 for (unsigned i = 0; i != NumArgs; i++) { 2010 Expr *Arg = Args[i]; 2011 DefaultArgumentPromotion(Arg); 2012 TheCall->setArg(i, Arg); 2013 } 2014 } 2015 2016 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 2017 if (!Method->isStatic()) 2018 return ExprError(Diag(LParenLoc, diag::err_member_call_without_object) 2019 << Fn->getSourceRange()); 2020 2021 // Do special checking on direct calls to functions. 2022 if (FDecl) 2023 return CheckFunctionCall(FDecl, TheCall.take()); 2024 2025 return Owned(TheCall.take()); 2026} 2027 2028Action::OwningExprResult 2029Sema::ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 2030 SourceLocation RParenLoc, ExprArg InitExpr) { 2031 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 2032 QualType literalType = QualType::getFromOpaquePtr(Ty); 2033 // FIXME: put back this assert when initializers are worked out. 2034 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 2035 Expr *literalExpr = static_cast<Expr*>(InitExpr.get()); 2036 2037 if (literalType->isArrayType()) { 2038 if (literalType->isVariableArrayType()) 2039 return ExprError(Diag(LParenLoc, diag::err_variable_object_no_init) 2040 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd())); 2041 } else if (DiagnoseIncompleteType(LParenLoc, literalType, 2042 diag::err_typecheck_decl_incomplete_type, 2043 SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()))) 2044 return ExprError(); 2045 2046 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 2047 DeclarationName(), /*FIXME:DirectInit=*/false)) 2048 return ExprError(); 2049 2050 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 2051 if (isFileScope) { // 6.5.2.5p3 2052 if (CheckForConstantInitializer(literalExpr, literalType)) 2053 return ExprError(); 2054 } 2055 InitExpr.release(); 2056 return Owned(new (Context) CompoundLiteralExpr(LParenLoc, literalType, 2057 literalExpr, isFileScope)); 2058} 2059 2060Action::OwningExprResult 2061Sema::ActOnInitList(SourceLocation LBraceLoc, MultiExprArg initlist, 2062 InitListDesignations &Designators, 2063 SourceLocation RBraceLoc) { 2064 unsigned NumInit = initlist.size(); 2065 Expr **InitList = reinterpret_cast<Expr**>(initlist.release()); 2066 2067 // Semantic analysis for initializers is done by ActOnDeclarator() and 2068 // CheckInitializer() - it requires knowledge of the object being intialized. 2069 2070 InitListExpr *E = new (Context) InitListExpr(LBraceLoc, InitList, NumInit, 2071 RBraceLoc); 2072 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 2073 return Owned(E); 2074} 2075 2076/// CheckCastTypes - Check type constraints for casting between types. 2077bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 2078 UsualUnaryConversions(castExpr); 2079 2080 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 2081 // type needs to be scalar. 2082 if (castType->isVoidType()) { 2083 // Cast to void allows any expr type. 2084 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 2085 // We can't check any more until template instantiation time. 2086 } else if (!castType->isScalarType() && !castType->isVectorType()) { 2087 if (Context.getCanonicalType(castType).getUnqualifiedType() == 2088 Context.getCanonicalType(castExpr->getType().getUnqualifiedType()) && 2089 (castType->isStructureType() || castType->isUnionType())) { 2090 // GCC struct/union extension: allow cast to self. 2091 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 2092 << castType << castExpr->getSourceRange(); 2093 } else if (castType->isUnionType()) { 2094 // GCC cast to union extension 2095 RecordDecl *RD = castType->getAsRecordType()->getDecl(); 2096 RecordDecl::field_iterator Field, FieldEnd; 2097 for (Field = RD->field_begin(), FieldEnd = RD->field_end(); 2098 Field != FieldEnd; ++Field) { 2099 if (Context.getCanonicalType(Field->getType()).getUnqualifiedType() == 2100 Context.getCanonicalType(castExpr->getType()).getUnqualifiedType()) { 2101 Diag(TyR.getBegin(), diag::ext_typecheck_cast_to_union) 2102 << castExpr->getSourceRange(); 2103 break; 2104 } 2105 } 2106 if (Field == FieldEnd) 2107 return Diag(TyR.getBegin(), diag::err_typecheck_cast_to_union_no_type) 2108 << castExpr->getType() << castExpr->getSourceRange(); 2109 } else { 2110 // Reject any other conversions to non-scalar types. 2111 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 2112 << castType << castExpr->getSourceRange(); 2113 } 2114 } else if (!castExpr->getType()->isScalarType() && 2115 !castExpr->getType()->isVectorType()) { 2116 return Diag(castExpr->getLocStart(), 2117 diag::err_typecheck_expect_scalar_operand) 2118 << castExpr->getType() << castExpr->getSourceRange(); 2119 } else if (castExpr->getType()->isVectorType()) { 2120 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 2121 return true; 2122 } else if (castType->isVectorType()) { 2123 if (CheckVectorCast(TyR, castType, castExpr->getType())) 2124 return true; 2125 } 2126 return false; 2127} 2128 2129bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 2130 assert(VectorTy->isVectorType() && "Not a vector type!"); 2131 2132 if (Ty->isVectorType() || Ty->isIntegerType()) { 2133 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 2134 return Diag(R.getBegin(), 2135 Ty->isVectorType() ? 2136 diag::err_invalid_conversion_between_vectors : 2137 diag::err_invalid_conversion_between_vector_and_integer) 2138 << VectorTy << Ty << R; 2139 } else 2140 return Diag(R.getBegin(), 2141 diag::err_invalid_conversion_between_vector_and_scalar) 2142 << VectorTy << Ty << R; 2143 2144 return false; 2145} 2146 2147Action::OwningExprResult 2148Sema::ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 2149 SourceLocation RParenLoc, ExprArg Op) { 2150 assert((Ty != 0) && (Op.get() != 0) && 2151 "ActOnCastExpr(): missing type or expr"); 2152 2153 Expr *castExpr = static_cast<Expr*>(Op.release()); 2154 QualType castType = QualType::getFromOpaquePtr(Ty); 2155 2156 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 2157 return ExprError(); 2158 return Owned(new (Context) CStyleCastExpr(castType, castExpr, castType, 2159 LParenLoc, RParenLoc)); 2160} 2161 2162/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 2163/// In that case, lex = cond. 2164inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 2165 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 2166 UsualUnaryConversions(cond); 2167 UsualUnaryConversions(lex); 2168 UsualUnaryConversions(rex); 2169 QualType condT = cond->getType(); 2170 QualType lexT = lex->getType(); 2171 QualType rexT = rex->getType(); 2172 2173 // first, check the condition. 2174 if (!cond->isTypeDependent()) { 2175 if (!condT->isScalarType()) { // C99 6.5.15p2 2176 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) << condT; 2177 return QualType(); 2178 } 2179 } 2180 2181 // Now check the two expressions. 2182 if ((lex && lex->isTypeDependent()) || (rex && rex->isTypeDependent())) 2183 return Context.DependentTy; 2184 2185 // If both operands have arithmetic type, do the usual arithmetic conversions 2186 // to find a common type: C99 6.5.15p3,5. 2187 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 2188 UsualArithmeticConversions(lex, rex); 2189 return lex->getType(); 2190 } 2191 2192 // If both operands are the same structure or union type, the result is that 2193 // type. 2194 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 2195 if (const RecordType *RHSRT = rexT->getAsRecordType()) 2196 if (LHSRT->getDecl() == RHSRT->getDecl()) 2197 // "If both the operands have structure or union type, the result has 2198 // that type." This implies that CV qualifiers are dropped. 2199 return lexT.getUnqualifiedType(); 2200 } 2201 2202 // C99 6.5.15p5: "If both operands have void type, the result has void type." 2203 // The following || allows only one side to be void (a GCC-ism). 2204 if (lexT->isVoidType() || rexT->isVoidType()) { 2205 if (!lexT->isVoidType()) 2206 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void) 2207 << rex->getSourceRange(); 2208 if (!rexT->isVoidType()) 2209 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void) 2210 << lex->getSourceRange(); 2211 ImpCastExprToType(lex, Context.VoidTy); 2212 ImpCastExprToType(rex, Context.VoidTy); 2213 return Context.VoidTy; 2214 } 2215 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 2216 // the type of the other operand." 2217 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 2218 Context.isObjCObjectPointerType(lexT)) && 2219 rex->isNullPointerConstant(Context)) { 2220 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 2221 return lexT; 2222 } 2223 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 2224 Context.isObjCObjectPointerType(rexT)) && 2225 lex->isNullPointerConstant(Context)) { 2226 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 2227 return rexT; 2228 } 2229 // Handle the case where both operands are pointers before we handle null 2230 // pointer constants in case both operands are null pointer constants. 2231 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 2232 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 2233 // get the "pointed to" types 2234 QualType lhptee = LHSPT->getPointeeType(); 2235 QualType rhptee = RHSPT->getPointeeType(); 2236 2237 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 2238 if (lhptee->isVoidType() && 2239 rhptee->isIncompleteOrObjectType()) { 2240 // Figure out necessary qualifiers (C99 6.5.15p6) 2241 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 2242 QualType destType = Context.getPointerType(destPointee); 2243 ImpCastExprToType(lex, destType); // add qualifiers if necessary 2244 ImpCastExprToType(rex, destType); // promote to void* 2245 return destType; 2246 } 2247 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 2248 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 2249 QualType destType = Context.getPointerType(destPointee); 2250 ImpCastExprToType(lex, destType); // add qualifiers if necessary 2251 ImpCastExprToType(rex, destType); // promote to void* 2252 return destType; 2253 } 2254 2255 QualType compositeType = lexT; 2256 2257 // If either type is an Objective-C object type then check 2258 // compatibility according to Objective-C. 2259 if (Context.isObjCObjectPointerType(lexT) || 2260 Context.isObjCObjectPointerType(rexT)) { 2261 // If both operands are interfaces and either operand can be 2262 // assigned to the other, use that type as the composite 2263 // type. This allows 2264 // xxx ? (A*) a : (B*) b 2265 // where B is a subclass of A. 2266 // 2267 // Additionally, as for assignment, if either type is 'id' 2268 // allow silent coercion. Finally, if the types are 2269 // incompatible then make sure to use 'id' as the composite 2270 // type so the result is acceptable for sending messages to. 2271 2272 // FIXME: Consider unifying with 'areComparableObjCPointerTypes'. 2273 // It could return the composite type. 2274 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2275 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2276 if (LHSIface && RHSIface && 2277 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 2278 compositeType = lexT; 2279 } else if (LHSIface && RHSIface && 2280 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 2281 compositeType = rexT; 2282 } else if (Context.isObjCIdStructType(lhptee) || 2283 Context.isObjCIdStructType(rhptee)) { 2284 compositeType = Context.getObjCIdType(); 2285 } else { 2286 Diag(questionLoc, diag::ext_typecheck_comparison_of_distinct_pointers) 2287 << lexT << rexT 2288 << lex->getSourceRange() << rex->getSourceRange(); 2289 QualType incompatTy = Context.getObjCIdType(); 2290 ImpCastExprToType(lex, incompatTy); 2291 ImpCastExprToType(rex, incompatTy); 2292 return incompatTy; 2293 } 2294 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2295 rhptee.getUnqualifiedType())) { 2296 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers) 2297 << lexT << rexT << lex->getSourceRange() << rex->getSourceRange(); 2298 // In this situation, we assume void* type. No especially good 2299 // reason, but this is what gcc does, and we do have to pick 2300 // to get a consistent AST. 2301 QualType incompatTy = Context.getPointerType(Context.VoidTy); 2302 ImpCastExprToType(lex, incompatTy); 2303 ImpCastExprToType(rex, incompatTy); 2304 return incompatTy; 2305 } 2306 // The pointer types are compatible. 2307 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 2308 // differently qualified versions of compatible types, the result type is 2309 // a pointer to an appropriately qualified version of the *composite* 2310 // type. 2311 // FIXME: Need to calculate the composite type. 2312 // FIXME: Need to add qualifiers 2313 ImpCastExprToType(lex, compositeType); 2314 ImpCastExprToType(rex, compositeType); 2315 return compositeType; 2316 } 2317 } 2318 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 2319 // evaluates to "struct objc_object *" (and is handled above when comparing 2320 // id with statically typed objects). 2321 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 2322 // GCC allows qualified id and any Objective-C type to devolve to 2323 // id. Currently localizing to here until clear this should be 2324 // part of ObjCQualifiedIdTypesAreCompatible. 2325 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 2326 (lexT->isObjCQualifiedIdType() && 2327 Context.isObjCObjectPointerType(rexT)) || 2328 (rexT->isObjCQualifiedIdType() && 2329 Context.isObjCObjectPointerType(lexT))) { 2330 // FIXME: This is not the correct composite type. This only 2331 // happens to work because id can more or less be used anywhere, 2332 // however this may change the type of method sends. 2333 // FIXME: gcc adds some type-checking of the arguments and emits 2334 // (confusing) incompatible comparison warnings in some 2335 // cases. Investigate. 2336 QualType compositeType = Context.getObjCIdType(); 2337 ImpCastExprToType(lex, compositeType); 2338 ImpCastExprToType(rex, compositeType); 2339 return compositeType; 2340 } 2341 } 2342 2343 // Selection between block pointer types is ok as long as they are the same. 2344 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 2345 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 2346 return lexT; 2347 2348 // Otherwise, the operands are not compatible. 2349 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands) 2350 << lexT << rexT << lex->getSourceRange() << rex->getSourceRange(); 2351 return QualType(); 2352} 2353 2354/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 2355/// in the case of a the GNU conditional expr extension. 2356Action::OwningExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 2357 SourceLocation ColonLoc, 2358 ExprArg Cond, ExprArg LHS, 2359 ExprArg RHS) { 2360 Expr *CondExpr = (Expr *) Cond.get(); 2361 Expr *LHSExpr = (Expr *) LHS.get(), *RHSExpr = (Expr *) RHS.get(); 2362 2363 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 2364 // was the condition. 2365 bool isLHSNull = LHSExpr == 0; 2366 if (isLHSNull) 2367 LHSExpr = CondExpr; 2368 2369 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2370 RHSExpr, QuestionLoc); 2371 if (result.isNull()) 2372 return ExprError(); 2373 2374 Cond.release(); 2375 LHS.release(); 2376 RHS.release(); 2377 return Owned(new (Context) ConditionalOperator(CondExpr, 2378 isLHSNull ? 0 : LHSExpr, 2379 RHSExpr, result)); 2380} 2381 2382 2383// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2384// being closely modeled after the C99 spec:-). The odd characteristic of this 2385// routine is it effectively iqnores the qualifiers on the top level pointee. 2386// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2387// FIXME: add a couple examples in this comment. 2388Sema::AssignConvertType 2389Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2390 QualType lhptee, rhptee; 2391 2392 // get the "pointed to" type (ignoring qualifiers at the top level) 2393 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2394 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2395 2396 // make sure we operate on the canonical type 2397 lhptee = Context.getCanonicalType(lhptee); 2398 rhptee = Context.getCanonicalType(rhptee); 2399 2400 AssignConvertType ConvTy = Compatible; 2401 2402 // C99 6.5.16.1p1: This following citation is common to constraints 2403 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2404 // qualifiers of the type *pointed to* by the right; 2405 // FIXME: Handle ASQualType 2406 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2407 ConvTy = CompatiblePointerDiscardsQualifiers; 2408 2409 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2410 // incomplete type and the other is a pointer to a qualified or unqualified 2411 // version of void... 2412 if (lhptee->isVoidType()) { 2413 if (rhptee->isIncompleteOrObjectType()) 2414 return ConvTy; 2415 2416 // As an extension, we allow cast to/from void* to function pointer. 2417 assert(rhptee->isFunctionType()); 2418 return FunctionVoidPointer; 2419 } 2420 2421 if (rhptee->isVoidType()) { 2422 if (lhptee->isIncompleteOrObjectType()) 2423 return ConvTy; 2424 2425 // As an extension, we allow cast to/from void* to function pointer. 2426 assert(lhptee->isFunctionType()); 2427 return FunctionVoidPointer; 2428 } 2429 2430 // Check for ObjC interfaces 2431 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2432 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2433 if (LHSIface && RHSIface && 2434 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 2435 return ConvTy; 2436 2437 // ID acts sort of like void* for ObjC interfaces 2438 if (LHSIface && Context.isObjCIdStructType(rhptee)) 2439 return ConvTy; 2440 if (RHSIface && Context.isObjCIdStructType(lhptee)) 2441 return ConvTy; 2442 2443 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2444 // unqualified versions of compatible types, ... 2445 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2446 rhptee.getUnqualifiedType())) 2447 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 2448 return ConvTy; 2449} 2450 2451/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2452/// block pointer types are compatible or whether a block and normal pointer 2453/// are compatible. It is more restrict than comparing two function pointer 2454// types. 2455Sema::AssignConvertType 2456Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2457 QualType rhsType) { 2458 QualType lhptee, rhptee; 2459 2460 // get the "pointed to" type (ignoring qualifiers at the top level) 2461 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2462 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2463 2464 // make sure we operate on the canonical type 2465 lhptee = Context.getCanonicalType(lhptee); 2466 rhptee = Context.getCanonicalType(rhptee); 2467 2468 AssignConvertType ConvTy = Compatible; 2469 2470 // For blocks we enforce that qualifiers are identical. 2471 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2472 ConvTy = CompatiblePointerDiscardsQualifiers; 2473 2474 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2475 return IncompatibleBlockPointer; 2476 return ConvTy; 2477} 2478 2479/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2480/// has code to accommodate several GCC extensions when type checking 2481/// pointers. Here are some objectionable examples that GCC considers warnings: 2482/// 2483/// int a, *pint; 2484/// short *pshort; 2485/// struct foo *pfoo; 2486/// 2487/// pint = pshort; // warning: assignment from incompatible pointer type 2488/// a = pint; // warning: assignment makes integer from pointer without a cast 2489/// pint = a; // warning: assignment makes pointer from integer without a cast 2490/// pint = pfoo; // warning: assignment from incompatible pointer type 2491/// 2492/// As a result, the code for dealing with pointers is more complex than the 2493/// C99 spec dictates. 2494/// 2495Sema::AssignConvertType 2496Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2497 // Get canonical types. We're not formatting these types, just comparing 2498 // them. 2499 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2500 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2501 2502 if (lhsType == rhsType) 2503 return Compatible; // Common case: fast path an exact match. 2504 2505 // If the left-hand side is a reference type, then we are in a 2506 // (rare!) case where we've allowed the use of references in C, 2507 // e.g., as a parameter type in a built-in function. In this case, 2508 // just make sure that the type referenced is compatible with the 2509 // right-hand side type. The caller is responsible for adjusting 2510 // lhsType so that the resulting expression does not have reference 2511 // type. 2512 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2513 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2514 return Compatible; 2515 return Incompatible; 2516 } 2517 2518 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 2519 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 2520 return Compatible; 2521 // Relax integer conversions like we do for pointers below. 2522 if (rhsType->isIntegerType()) 2523 return IntToPointer; 2524 if (lhsType->isIntegerType()) 2525 return PointerToInt; 2526 return IncompatibleObjCQualifiedId; 2527 } 2528 2529 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2530 // For ExtVector, allow vector splats; float -> <n x float> 2531 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2532 if (LV->getElementType() == rhsType) 2533 return Compatible; 2534 2535 // If we are allowing lax vector conversions, and LHS and RHS are both 2536 // vectors, the total size only needs to be the same. This is a bitcast; 2537 // no bits are changed but the result type is different. 2538 if (getLangOptions().LaxVectorConversions && 2539 lhsType->isVectorType() && rhsType->isVectorType()) { 2540 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2541 return IncompatibleVectors; 2542 } 2543 return Incompatible; 2544 } 2545 2546 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2547 return Compatible; 2548 2549 if (isa<PointerType>(lhsType)) { 2550 if (rhsType->isIntegerType()) 2551 return IntToPointer; 2552 2553 if (isa<PointerType>(rhsType)) 2554 return CheckPointerTypesForAssignment(lhsType, rhsType); 2555 2556 if (rhsType->getAsBlockPointerType()) { 2557 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2558 return Compatible; 2559 2560 // Treat block pointers as objects. 2561 if (getLangOptions().ObjC1 && 2562 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2563 return Compatible; 2564 } 2565 return Incompatible; 2566 } 2567 2568 if (isa<BlockPointerType>(lhsType)) { 2569 if (rhsType->isIntegerType()) 2570 return IntToPointer; 2571 2572 // Treat block pointers as objects. 2573 if (getLangOptions().ObjC1 && 2574 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2575 return Compatible; 2576 2577 if (rhsType->isBlockPointerType()) 2578 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2579 2580 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2581 if (RHSPT->getPointeeType()->isVoidType()) 2582 return Compatible; 2583 } 2584 return Incompatible; 2585 } 2586 2587 if (isa<PointerType>(rhsType)) { 2588 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2589 if (lhsType == Context.BoolTy) 2590 return Compatible; 2591 2592 if (lhsType->isIntegerType()) 2593 return PointerToInt; 2594 2595 if (isa<PointerType>(lhsType)) 2596 return CheckPointerTypesForAssignment(lhsType, rhsType); 2597 2598 if (isa<BlockPointerType>(lhsType) && 2599 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2600 return Compatible; 2601 return Incompatible; 2602 } 2603 2604 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 2605 if (Context.typesAreCompatible(lhsType, rhsType)) 2606 return Compatible; 2607 } 2608 return Incompatible; 2609} 2610 2611Sema::AssignConvertType 2612Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2613 if (getLangOptions().CPlusPlus) { 2614 if (!lhsType->isRecordType()) { 2615 // C++ 5.17p3: If the left operand is not of class type, the 2616 // expression is implicitly converted (C++ 4) to the 2617 // cv-unqualified type of the left operand. 2618 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 2619 "assigning")) 2620 return Incompatible; 2621 else 2622 return Compatible; 2623 } 2624 2625 // FIXME: Currently, we fall through and treat C++ classes like C 2626 // structures. 2627 } 2628 2629 // C99 6.5.16.1p1: the left operand is a pointer and the right is 2630 // a null pointer constant. 2631 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 2632 lhsType->isBlockPointerType()) 2633 && rExpr->isNullPointerConstant(Context)) { 2634 ImpCastExprToType(rExpr, lhsType); 2635 return Compatible; 2636 } 2637 2638 // We don't allow conversion of non-null-pointer constants to integers. 2639 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 2640 return IntToBlockPointer; 2641 2642 // This check seems unnatural, however it is necessary to ensure the proper 2643 // conversion of functions/arrays. If the conversion were done for all 2644 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 2645 // expressions that surpress this implicit conversion (&, sizeof). 2646 // 2647 // Suppress this for references: C++ 8.5.3p5. 2648 if (!lhsType->isReferenceType()) 2649 DefaultFunctionArrayConversion(rExpr); 2650 2651 Sema::AssignConvertType result = 2652 CheckAssignmentConstraints(lhsType, rExpr->getType()); 2653 2654 // C99 6.5.16.1p2: The value of the right operand is converted to the 2655 // type of the assignment expression. 2656 // CheckAssignmentConstraints allows the left-hand side to be a reference, 2657 // so that we can use references in built-in functions even in C. 2658 // The getNonReferenceType() call makes sure that the resulting expression 2659 // does not have reference type. 2660 if (rExpr->getType() != lhsType) 2661 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 2662 return result; 2663} 2664 2665Sema::AssignConvertType 2666Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 2667 return CheckAssignmentConstraints(lhsType, rhsType); 2668} 2669 2670QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 2671 Diag(Loc, diag::err_typecheck_invalid_operands) 2672 << lex->getType() << rex->getType() 2673 << lex->getSourceRange() << rex->getSourceRange(); 2674 return QualType(); 2675} 2676 2677inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 2678 Expr *&rex) { 2679 // For conversion purposes, we ignore any qualifiers. 2680 // For example, "const float" and "float" are equivalent. 2681 QualType lhsType = 2682 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 2683 QualType rhsType = 2684 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 2685 2686 // If the vector types are identical, return. 2687 if (lhsType == rhsType) 2688 return lhsType; 2689 2690 // Handle the case of a vector & extvector type of the same size and element 2691 // type. It would be nice if we only had one vector type someday. 2692 if (getLangOptions().LaxVectorConversions) { 2693 // FIXME: Should we warn here? 2694 if (const VectorType *LV = lhsType->getAsVectorType()) { 2695 if (const VectorType *RV = rhsType->getAsVectorType()) 2696 if (LV->getElementType() == RV->getElementType() && 2697 LV->getNumElements() == RV->getNumElements()) { 2698 return lhsType->isExtVectorType() ? lhsType : rhsType; 2699 } 2700 } 2701 } 2702 2703 // If the lhs is an extended vector and the rhs is a scalar of the same type 2704 // or a literal, promote the rhs to the vector type. 2705 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 2706 QualType eltType = V->getElementType(); 2707 2708 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 2709 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 2710 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 2711 ImpCastExprToType(rex, lhsType); 2712 return lhsType; 2713 } 2714 } 2715 2716 // If the rhs is an extended vector and the lhs is a scalar of the same type, 2717 // promote the lhs to the vector type. 2718 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 2719 QualType eltType = V->getElementType(); 2720 2721 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 2722 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 2723 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 2724 ImpCastExprToType(lex, rhsType); 2725 return rhsType; 2726 } 2727 } 2728 2729 // You cannot convert between vector values of different size. 2730 Diag(Loc, diag::err_typecheck_vector_not_convertable) 2731 << lex->getType() << rex->getType() 2732 << lex->getSourceRange() << rex->getSourceRange(); 2733 return QualType(); 2734} 2735 2736inline QualType Sema::CheckMultiplyDivideOperands( 2737 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2738{ 2739 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2740 return CheckVectorOperands(Loc, lex, rex); 2741 2742 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2743 2744 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2745 return compType; 2746 return InvalidOperands(Loc, lex, rex); 2747} 2748 2749inline QualType Sema::CheckRemainderOperands( 2750 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2751{ 2752 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) { 2753 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2754 return CheckVectorOperands(Loc, lex, rex); 2755 return InvalidOperands(Loc, lex, rex); 2756 } 2757 2758 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2759 2760 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2761 return compType; 2762 return InvalidOperands(Loc, lex, rex); 2763} 2764 2765inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 2766 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2767{ 2768 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2769 return CheckVectorOperands(Loc, lex, rex); 2770 2771 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2772 2773 // handle the common case first (both operands are arithmetic). 2774 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2775 return compType; 2776 2777 // Put any potential pointer into PExp 2778 Expr* PExp = lex, *IExp = rex; 2779 if (IExp->getType()->isPointerType()) 2780 std::swap(PExp, IExp); 2781 2782 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 2783 if (IExp->getType()->isIntegerType()) { 2784 // Check for arithmetic on pointers to incomplete types 2785 if (!PTy->getPointeeType()->isObjectType()) { 2786 if (PTy->getPointeeType()->isVoidType()) { 2787 if (getLangOptions().CPlusPlus) { 2788 Diag(Loc, diag::err_typecheck_pointer_arith_void_type) 2789 << lex->getSourceRange() << rex->getSourceRange(); 2790 return QualType(); 2791 } 2792 2793 // GNU extension: arithmetic on pointer to void 2794 Diag(Loc, diag::ext_gnu_void_ptr) 2795 << lex->getSourceRange() << rex->getSourceRange(); 2796 } else if (PTy->getPointeeType()->isFunctionType()) { 2797 if (getLangOptions().CPlusPlus) { 2798 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 2799 << lex->getType() << lex->getSourceRange(); 2800 return QualType(); 2801 } 2802 2803 // GNU extension: arithmetic on pointer to function 2804 Diag(Loc, diag::ext_gnu_ptr_func_arith) 2805 << lex->getType() << lex->getSourceRange(); 2806 } else { 2807 DiagnoseIncompleteType(Loc, PTy->getPointeeType(), 2808 diag::err_typecheck_arithmetic_incomplete_type, 2809 lex->getSourceRange(), SourceRange(), 2810 lex->getType()); 2811 return QualType(); 2812 } 2813 } 2814 return PExp->getType(); 2815 } 2816 } 2817 2818 return InvalidOperands(Loc, lex, rex); 2819} 2820 2821// C99 6.5.6 2822QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 2823 SourceLocation Loc, bool isCompAssign) { 2824 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2825 return CheckVectorOperands(Loc, lex, rex); 2826 2827 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2828 2829 // Enforce type constraints: C99 6.5.6p3. 2830 2831 // Handle the common case first (both operands are arithmetic). 2832 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2833 return compType; 2834 2835 // Either ptr - int or ptr - ptr. 2836 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 2837 QualType lpointee = LHSPTy->getPointeeType(); 2838 2839 // The LHS must be an object type, not incomplete, function, etc. 2840 if (!lpointee->isObjectType()) { 2841 // Handle the GNU void* extension. 2842 if (lpointee->isVoidType()) { 2843 Diag(Loc, diag::ext_gnu_void_ptr) 2844 << lex->getSourceRange() << rex->getSourceRange(); 2845 } else if (lpointee->isFunctionType()) { 2846 if (getLangOptions().CPlusPlus) { 2847 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 2848 << lex->getType() << lex->getSourceRange(); 2849 return QualType(); 2850 } 2851 2852 // GNU extension: arithmetic on pointer to function 2853 Diag(Loc, diag::ext_gnu_ptr_func_arith) 2854 << lex->getType() << lex->getSourceRange(); 2855 } else { 2856 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2857 << lex->getType() << lex->getSourceRange(); 2858 return QualType(); 2859 } 2860 } 2861 2862 // The result type of a pointer-int computation is the pointer type. 2863 if (rex->getType()->isIntegerType()) 2864 return lex->getType(); 2865 2866 // Handle pointer-pointer subtractions. 2867 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 2868 QualType rpointee = RHSPTy->getPointeeType(); 2869 2870 // RHS must be an object type, unless void (GNU). 2871 if (!rpointee->isObjectType()) { 2872 // Handle the GNU void* extension. 2873 if (rpointee->isVoidType()) { 2874 if (!lpointee->isVoidType()) 2875 Diag(Loc, diag::ext_gnu_void_ptr) 2876 << lex->getSourceRange() << rex->getSourceRange(); 2877 } else if (rpointee->isFunctionType()) { 2878 if (getLangOptions().CPlusPlus) { 2879 Diag(Loc, diag::err_typecheck_pointer_arith_function_type) 2880 << rex->getType() << rex->getSourceRange(); 2881 return QualType(); 2882 } 2883 2884 // GNU extension: arithmetic on pointer to function 2885 if (!lpointee->isFunctionType()) 2886 Diag(Loc, diag::ext_gnu_ptr_func_arith) 2887 << lex->getType() << lex->getSourceRange(); 2888 } else { 2889 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2890 << rex->getType() << rex->getSourceRange(); 2891 return QualType(); 2892 } 2893 } 2894 2895 // Pointee types must be compatible. 2896 if (!Context.typesAreCompatible( 2897 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2898 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2899 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 2900 << lex->getType() << rex->getType() 2901 << lex->getSourceRange() << rex->getSourceRange(); 2902 return QualType(); 2903 } 2904 2905 return Context.getPointerDiffType(); 2906 } 2907 } 2908 2909 return InvalidOperands(Loc, lex, rex); 2910} 2911 2912// C99 6.5.7 2913QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2914 bool isCompAssign) { 2915 // C99 6.5.7p2: Each of the operands shall have integer type. 2916 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2917 return InvalidOperands(Loc, lex, rex); 2918 2919 // Shifts don't perform usual arithmetic conversions, they just do integer 2920 // promotions on each operand. C99 6.5.7p3 2921 if (!isCompAssign) 2922 UsualUnaryConversions(lex); 2923 UsualUnaryConversions(rex); 2924 2925 // "The type of the result is that of the promoted left operand." 2926 return lex->getType(); 2927} 2928 2929// C99 6.5.8 2930QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2931 bool isRelational) { 2932 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2933 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 2934 2935 // C99 6.5.8p3 / C99 6.5.9p4 2936 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2937 UsualArithmeticConversions(lex, rex); 2938 else { 2939 UsualUnaryConversions(lex); 2940 UsualUnaryConversions(rex); 2941 } 2942 QualType lType = lex->getType(); 2943 QualType rType = rex->getType(); 2944 2945 // For non-floating point types, check for self-comparisons of the form 2946 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2947 // often indicate logic errors in the program. 2948 if (!lType->isFloatingType()) { 2949 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2950 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2951 if (DRL->getDecl() == DRR->getDecl()) 2952 Diag(Loc, diag::warn_selfcomparison); 2953 } 2954 2955 // The result of comparisons is 'bool' in C++, 'int' in C. 2956 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy : Context.IntTy; 2957 2958 if (isRelational) { 2959 if (lType->isRealType() && rType->isRealType()) 2960 return ResultTy; 2961 } else { 2962 // Check for comparisons of floating point operands using != and ==. 2963 if (lType->isFloatingType()) { 2964 assert (rType->isFloatingType()); 2965 CheckFloatComparison(Loc,lex,rex); 2966 } 2967 2968 if (lType->isArithmeticType() && rType->isArithmeticType()) 2969 return ResultTy; 2970 } 2971 2972 bool LHSIsNull = lex->isNullPointerConstant(Context); 2973 bool RHSIsNull = rex->isNullPointerConstant(Context); 2974 2975 // All of the following pointer related warnings are GCC extensions, except 2976 // when handling null pointer constants. One day, we can consider making them 2977 // errors (when -pedantic-errors is enabled). 2978 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2979 QualType LCanPointeeTy = 2980 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2981 QualType RCanPointeeTy = 2982 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2983 2984 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2985 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2986 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2987 RCanPointeeTy.getUnqualifiedType()) && 2988 !Context.areComparableObjCPointerTypes(lType, rType)) { 2989 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2990 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2991 } 2992 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2993 return ResultTy; 2994 } 2995 // Handle block pointer types. 2996 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2997 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2998 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2999 3000 if (!LHSIsNull && !RHSIsNull && 3001 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 3002 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3003 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3004 } 3005 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3006 return ResultTy; 3007 } 3008 // Allow block pointers to be compared with null pointer constants. 3009 if ((lType->isBlockPointerType() && rType->isPointerType()) || 3010 (lType->isPointerType() && rType->isBlockPointerType())) { 3011 if (!LHSIsNull && !RHSIsNull) { 3012 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 3013 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3014 } 3015 ImpCastExprToType(rex, lType); // promote the pointer to pointer 3016 return ResultTy; 3017 } 3018 3019 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 3020 if (lType->isPointerType() || rType->isPointerType()) { 3021 const PointerType *LPT = lType->getAsPointerType(); 3022 const PointerType *RPT = rType->getAsPointerType(); 3023 bool LPtrToVoid = LPT ? 3024 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 3025 bool RPtrToVoid = RPT ? 3026 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 3027 3028 if (!LPtrToVoid && !RPtrToVoid && 3029 !Context.typesAreCompatible(lType, rType)) { 3030 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 3031 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3032 ImpCastExprToType(rex, lType); 3033 return ResultTy; 3034 } 3035 ImpCastExprToType(rex, lType); 3036 return ResultTy; 3037 } 3038 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 3039 ImpCastExprToType(rex, lType); 3040 return ResultTy; 3041 } else { 3042 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 3043 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 3044 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3045 ImpCastExprToType(rex, lType); 3046 return ResultTy; 3047 } 3048 } 3049 } 3050 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 3051 rType->isIntegerType()) { 3052 if (!RHSIsNull) 3053 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3054 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3055 ImpCastExprToType(rex, lType); // promote the integer to pointer 3056 return ResultTy; 3057 } 3058 if (lType->isIntegerType() && 3059 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 3060 if (!LHSIsNull) 3061 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3062 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3063 ImpCastExprToType(lex, rType); // promote the integer to pointer 3064 return ResultTy; 3065 } 3066 // Handle block pointers. 3067 if (lType->isBlockPointerType() && rType->isIntegerType()) { 3068 if (!RHSIsNull) 3069 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3070 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3071 ImpCastExprToType(rex, lType); // promote the integer to pointer 3072 return ResultTy; 3073 } 3074 if (lType->isIntegerType() && rType->isBlockPointerType()) { 3075 if (!LHSIsNull) 3076 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 3077 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 3078 ImpCastExprToType(lex, rType); // promote the integer to pointer 3079 return ResultTy; 3080 } 3081 return InvalidOperands(Loc, lex, rex); 3082} 3083 3084/// CheckVectorCompareOperands - vector comparisons are a clang extension that 3085/// operates on extended vector types. Instead of producing an IntTy result, 3086/// like a scalar comparison, a vector comparison produces a vector of integer 3087/// types. 3088QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 3089 SourceLocation Loc, 3090 bool isRelational) { 3091 // Check to make sure we're operating on vectors of the same type and width, 3092 // Allowing one side to be a scalar of element type. 3093 QualType vType = CheckVectorOperands(Loc, lex, rex); 3094 if (vType.isNull()) 3095 return vType; 3096 3097 QualType lType = lex->getType(); 3098 QualType rType = rex->getType(); 3099 3100 // For non-floating point types, check for self-comparisons of the form 3101 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 3102 // often indicate logic errors in the program. 3103 if (!lType->isFloatingType()) { 3104 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 3105 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 3106 if (DRL->getDecl() == DRR->getDecl()) 3107 Diag(Loc, diag::warn_selfcomparison); 3108 } 3109 3110 // Check for comparisons of floating point operands using != and ==. 3111 if (!isRelational && lType->isFloatingType()) { 3112 assert (rType->isFloatingType()); 3113 CheckFloatComparison(Loc,lex,rex); 3114 } 3115 3116 // Return the type for the comparison, which is the same as vector type for 3117 // integer vectors, or an integer type of identical size and number of 3118 // elements for floating point vectors. 3119 if (lType->isIntegerType()) 3120 return lType; 3121 3122 const VectorType *VTy = lType->getAsVectorType(); 3123 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 3124 if (TypeSize == Context.getTypeSize(Context.IntTy)) 3125 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 3126 else if (TypeSize == Context.getTypeSize(Context.LongTy)) 3127 return Context.getExtVectorType(Context.LongTy, VTy->getNumElements()); 3128 3129 assert(TypeSize == Context.getTypeSize(Context.LongLongTy) && 3130 "Unhandled vector element size in vector compare"); 3131 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 3132} 3133 3134inline QualType Sema::CheckBitwiseOperands( 3135 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 3136{ 3137 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 3138 return CheckVectorOperands(Loc, lex, rex); 3139 3140 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 3141 3142 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 3143 return compType; 3144 return InvalidOperands(Loc, lex, rex); 3145} 3146 3147inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 3148 Expr *&lex, Expr *&rex, SourceLocation Loc) 3149{ 3150 UsualUnaryConversions(lex); 3151 UsualUnaryConversions(rex); 3152 3153 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 3154 return Context.IntTy; 3155 return InvalidOperands(Loc, lex, rex); 3156} 3157 3158/// IsReadonlyProperty - Verify that otherwise a valid l-value expression 3159/// is a read-only property; return true if so. A readonly property expression 3160/// depends on various declarations and thus must be treated specially. 3161/// 3162static bool IsReadonlyProperty(Expr *E, Sema &S) 3163{ 3164 if (E->getStmtClass() == Expr::ObjCPropertyRefExprClass) { 3165 const ObjCPropertyRefExpr* PropExpr = cast<ObjCPropertyRefExpr>(E); 3166 if (ObjCPropertyDecl *PDecl = PropExpr->getProperty()) { 3167 QualType BaseType = PropExpr->getBase()->getType(); 3168 if (const PointerType *PTy = BaseType->getAsPointerType()) 3169 if (const ObjCInterfaceType *IFTy = 3170 PTy->getPointeeType()->getAsObjCInterfaceType()) 3171 if (ObjCInterfaceDecl *IFace = IFTy->getDecl()) 3172 if (S.isPropertyReadonly(PDecl, IFace)) 3173 return true; 3174 } 3175 } 3176 return false; 3177} 3178 3179/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 3180/// emit an error and return true. If so, return false. 3181static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 3182 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 3183 if (IsLV == Expr::MLV_Valid && IsReadonlyProperty(E, S)) 3184 IsLV = Expr::MLV_ReadonlyProperty; 3185 if (IsLV == Expr::MLV_Valid) 3186 return false; 3187 3188 unsigned Diag = 0; 3189 bool NeedType = false; 3190 switch (IsLV) { // C99 6.5.16p2 3191 default: assert(0 && "Unknown result from isModifiableLvalue!"); 3192 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 3193 case Expr::MLV_ArrayType: 3194 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 3195 NeedType = true; 3196 break; 3197 case Expr::MLV_NotObjectType: 3198 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 3199 NeedType = true; 3200 break; 3201 case Expr::MLV_LValueCast: 3202 Diag = diag::err_typecheck_lvalue_casts_not_supported; 3203 break; 3204 case Expr::MLV_InvalidExpression: 3205 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 3206 break; 3207 case Expr::MLV_IncompleteType: 3208 case Expr::MLV_IncompleteVoidType: 3209 return S.DiagnoseIncompleteType(Loc, E->getType(), 3210 diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 3211 E->getSourceRange()); 3212 case Expr::MLV_DuplicateVectorComponents: 3213 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 3214 break; 3215 case Expr::MLV_NotBlockQualified: 3216 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 3217 break; 3218 case Expr::MLV_ReadonlyProperty: 3219 Diag = diag::error_readonly_property_assignment; 3220 break; 3221 case Expr::MLV_NoSetterProperty: 3222 Diag = diag::error_nosetter_property_assignment; 3223 break; 3224 } 3225 3226 if (NeedType) 3227 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 3228 else 3229 S.Diag(Loc, Diag) << E->getSourceRange(); 3230 return true; 3231} 3232 3233 3234 3235// C99 6.5.16.1 3236QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 3237 SourceLocation Loc, 3238 QualType CompoundType) { 3239 // Verify that LHS is a modifiable lvalue, and emit error if not. 3240 if (CheckForModifiableLvalue(LHS, Loc, *this)) 3241 return QualType(); 3242 3243 QualType LHSType = LHS->getType(); 3244 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 3245 3246 AssignConvertType ConvTy; 3247 if (CompoundType.isNull()) { 3248 // Simple assignment "x = y". 3249 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 3250 // Special case of NSObject attributes on c-style pointer types. 3251 if (ConvTy == IncompatiblePointer && 3252 ((Context.isObjCNSObjectType(LHSType) && 3253 Context.isObjCObjectPointerType(RHSType)) || 3254 (Context.isObjCNSObjectType(RHSType) && 3255 Context.isObjCObjectPointerType(LHSType)))) 3256 ConvTy = Compatible; 3257 3258 // If the RHS is a unary plus or minus, check to see if they = and + are 3259 // right next to each other. If so, the user may have typo'd "x =+ 4" 3260 // instead of "x += 4". 3261 Expr *RHSCheck = RHS; 3262 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 3263 RHSCheck = ICE->getSubExpr(); 3264 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 3265 if ((UO->getOpcode() == UnaryOperator::Plus || 3266 UO->getOpcode() == UnaryOperator::Minus) && 3267 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 3268 // Only if the two operators are exactly adjacent. 3269 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 3270 Diag(Loc, diag::warn_not_compound_assign) 3271 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 3272 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 3273 } 3274 } else { 3275 // Compound assignment "x += y" 3276 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 3277 } 3278 3279 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 3280 RHS, "assigning")) 3281 return QualType(); 3282 3283 // C99 6.5.16p3: The type of an assignment expression is the type of the 3284 // left operand unless the left operand has qualified type, in which case 3285 // it is the unqualified version of the type of the left operand. 3286 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 3287 // is converted to the type of the assignment expression (above). 3288 // C++ 5.17p1: the type of the assignment expression is that of its left 3289 // oprdu. 3290 return LHSType.getUnqualifiedType(); 3291} 3292 3293// C99 6.5.17 3294QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 3295 // FIXME: what is required for LHS? 3296 3297 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 3298 DefaultFunctionArrayConversion(RHS); 3299 return RHS->getType(); 3300} 3301 3302/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 3303/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 3304QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 3305 bool isInc) { 3306 QualType ResType = Op->getType(); 3307 assert(!ResType.isNull() && "no type for increment/decrement expression"); 3308 3309 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 3310 // Decrement of bool is not allowed. 3311 if (!isInc) { 3312 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 3313 return QualType(); 3314 } 3315 // Increment of bool sets it to true, but is deprecated. 3316 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 3317 } else if (ResType->isRealType()) { 3318 // OK! 3319 } else if (const PointerType *PT = ResType->getAsPointerType()) { 3320 // C99 6.5.2.4p2, 6.5.6p2 3321 if (PT->getPointeeType()->isObjectType()) { 3322 // Pointer to object is ok! 3323 } else if (PT->getPointeeType()->isVoidType()) { 3324 if (getLangOptions().CPlusPlus) { 3325 Diag(OpLoc, diag::err_typecheck_pointer_arith_void_type) 3326 << Op->getSourceRange(); 3327 return QualType(); 3328 } 3329 3330 // Pointer to void is a GNU extension in C. 3331 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 3332 } else if (PT->getPointeeType()->isFunctionType()) { 3333 if (getLangOptions().CPlusPlus) { 3334 Diag(OpLoc, diag::err_typecheck_pointer_arith_function_type) 3335 << Op->getType() << Op->getSourceRange(); 3336 return QualType(); 3337 } 3338 3339 Diag(OpLoc, diag::ext_gnu_ptr_func_arith) 3340 << ResType << Op->getSourceRange(); 3341 return QualType(); 3342 } else { 3343 DiagnoseIncompleteType(OpLoc, PT->getPointeeType(), 3344 diag::err_typecheck_arithmetic_incomplete_type, 3345 Op->getSourceRange(), SourceRange(), 3346 ResType); 3347 return QualType(); 3348 } 3349 } else if (ResType->isComplexType()) { 3350 // C99 does not support ++/-- on complex types, we allow as an extension. 3351 Diag(OpLoc, diag::ext_integer_increment_complex) 3352 << ResType << Op->getSourceRange(); 3353 } else { 3354 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 3355 << ResType << Op->getSourceRange(); 3356 return QualType(); 3357 } 3358 // At this point, we know we have a real, complex or pointer type. 3359 // Now make sure the operand is a modifiable lvalue. 3360 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 3361 return QualType(); 3362 return ResType; 3363} 3364 3365/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 3366/// This routine allows us to typecheck complex/recursive expressions 3367/// where the declaration is needed for type checking. We only need to 3368/// handle cases when the expression references a function designator 3369/// or is an lvalue. Here are some examples: 3370/// - &(x) => x 3371/// - &*****f => f for f a function designator. 3372/// - &s.xx => s 3373/// - &s.zz[1].yy -> s, if zz is an array 3374/// - *(x + 1) -> x, if x is an array 3375/// - &"123"[2] -> 0 3376/// - & __real__ x -> x 3377static NamedDecl *getPrimaryDecl(Expr *E) { 3378 switch (E->getStmtClass()) { 3379 case Stmt::DeclRefExprClass: 3380 case Stmt::QualifiedDeclRefExprClass: 3381 return cast<DeclRefExpr>(E)->getDecl(); 3382 case Stmt::MemberExprClass: 3383 // Fields cannot be declared with a 'register' storage class. 3384 // &X->f is always ok, even if X is declared register. 3385 if (cast<MemberExpr>(E)->isArrow()) 3386 return 0; 3387 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 3388 case Stmt::ArraySubscriptExprClass: { 3389 // &X[4] and &4[X] refers to X if X is not a pointer. 3390 3391 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 3392 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 3393 if (!VD || VD->getType()->isPointerType()) 3394 return 0; 3395 else 3396 return VD; 3397 } 3398 case Stmt::UnaryOperatorClass: { 3399 UnaryOperator *UO = cast<UnaryOperator>(E); 3400 3401 switch(UO->getOpcode()) { 3402 case UnaryOperator::Deref: { 3403 // *(X + 1) refers to X if X is not a pointer. 3404 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 3405 ValueDecl *VD = dyn_cast<ValueDecl>(D); 3406 if (!VD || VD->getType()->isPointerType()) 3407 return 0; 3408 return VD; 3409 } 3410 return 0; 3411 } 3412 case UnaryOperator::Real: 3413 case UnaryOperator::Imag: 3414 case UnaryOperator::Extension: 3415 return getPrimaryDecl(UO->getSubExpr()); 3416 default: 3417 return 0; 3418 } 3419 } 3420 case Stmt::BinaryOperatorClass: { 3421 BinaryOperator *BO = cast<BinaryOperator>(E); 3422 3423 // Handle cases involving pointer arithmetic. The result of an 3424 // Assign or AddAssign is not an lvalue so they can be ignored. 3425 3426 // (x + n) or (n + x) => x 3427 if (BO->getOpcode() == BinaryOperator::Add) { 3428 if (BO->getLHS()->getType()->isPointerType()) { 3429 return getPrimaryDecl(BO->getLHS()); 3430 } else if (BO->getRHS()->getType()->isPointerType()) { 3431 return getPrimaryDecl(BO->getRHS()); 3432 } 3433 } 3434 3435 return 0; 3436 } 3437 case Stmt::ParenExprClass: 3438 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 3439 case Stmt::ImplicitCastExprClass: 3440 // &X[4] when X is an array, has an implicit cast from array to pointer. 3441 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 3442 default: 3443 return 0; 3444 } 3445} 3446 3447/// CheckAddressOfOperand - The operand of & must be either a function 3448/// designator or an lvalue designating an object. If it is an lvalue, the 3449/// object cannot be declared with storage class register or be a bit field. 3450/// Note: The usual conversions are *not* applied to the operand of the & 3451/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 3452/// In C++, the operand might be an overloaded function name, in which case 3453/// we allow the '&' but retain the overloaded-function type. 3454QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 3455 if (op->isTypeDependent()) 3456 return Context.DependentTy; 3457 3458 if (getLangOptions().C99) { 3459 // Implement C99-only parts of addressof rules. 3460 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 3461 if (uOp->getOpcode() == UnaryOperator::Deref) 3462 // Per C99 6.5.3.2, the address of a deref always returns a valid result 3463 // (assuming the deref expression is valid). 3464 return uOp->getSubExpr()->getType(); 3465 } 3466 // Technically, there should be a check for array subscript 3467 // expressions here, but the result of one is always an lvalue anyway. 3468 } 3469 NamedDecl *dcl = getPrimaryDecl(op); 3470 Expr::isLvalueResult lval = op->isLvalue(Context); 3471 3472 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 3473 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 3474 // FIXME: emit more specific diag... 3475 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 3476 << op->getSourceRange(); 3477 return QualType(); 3478 } 3479 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 3480 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemExpr->getMemberDecl())) { 3481 if (Field->isBitField()) { 3482 Diag(OpLoc, diag::err_typecheck_address_of) 3483 << "bit-field" << op->getSourceRange(); 3484 return QualType(); 3485 } 3486 } 3487 // Check for Apple extension for accessing vector components. 3488 } else if (isa<ExtVectorElementExpr>(op) || (isa<ArraySubscriptExpr>(op) && 3489 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType())){ 3490 Diag(OpLoc, diag::err_typecheck_address_of) 3491 << "vector element" << op->getSourceRange(); 3492 return QualType(); 3493 } else if (dcl) { // C99 6.5.3.2p1 3494 // We have an lvalue with a decl. Make sure the decl is not declared 3495 // with the register storage-class specifier. 3496 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 3497 if (vd->getStorageClass() == VarDecl::Register) { 3498 Diag(OpLoc, diag::err_typecheck_address_of) 3499 << "register variable" << op->getSourceRange(); 3500 return QualType(); 3501 } 3502 } else if (isa<OverloadedFunctionDecl>(dcl)) { 3503 return Context.OverloadTy; 3504 } else if (isa<FieldDecl>(dcl)) { 3505 // Okay: we can take the address of a field. 3506 // Could be a pointer to member, though, if there is an explicit 3507 // scope qualifier for the class. 3508 if (isa<QualifiedDeclRefExpr>(op)) { 3509 DeclContext *Ctx = dcl->getDeclContext(); 3510 if (Ctx && Ctx->isRecord()) 3511 return Context.getMemberPointerType(op->getType(), 3512 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3513 } 3514 } else if (isa<FunctionDecl>(dcl)) { 3515 // Okay: we can take the address of a function. 3516 // As above. 3517 if (isa<QualifiedDeclRefExpr>(op)) { 3518 DeclContext *Ctx = dcl->getDeclContext(); 3519 if (Ctx && Ctx->isRecord()) 3520 return Context.getMemberPointerType(op->getType(), 3521 Context.getTypeDeclType(cast<RecordDecl>(Ctx)).getTypePtr()); 3522 } 3523 } 3524 else 3525 assert(0 && "Unknown/unexpected decl type"); 3526 } 3527 3528 // If the operand has type "type", the result has type "pointer to type". 3529 return Context.getPointerType(op->getType()); 3530} 3531 3532QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 3533 UsualUnaryConversions(Op); 3534 QualType Ty = Op->getType(); 3535 3536 // Note that per both C89 and C99, this is always legal, even if ptype is an 3537 // incomplete type or void. It would be possible to warn about dereferencing 3538 // a void pointer, but it's completely well-defined, and such a warning is 3539 // unlikely to catch any mistakes. 3540 if (const PointerType *PT = Ty->getAsPointerType()) 3541 return PT->getPointeeType(); 3542 3543 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 3544 << Ty << Op->getSourceRange(); 3545 return QualType(); 3546} 3547 3548static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 3549 tok::TokenKind Kind) { 3550 BinaryOperator::Opcode Opc; 3551 switch (Kind) { 3552 default: assert(0 && "Unknown binop!"); 3553 case tok::periodstar: Opc = BinaryOperator::PtrMemD; break; 3554 case tok::arrowstar: Opc = BinaryOperator::PtrMemI; break; 3555 case tok::star: Opc = BinaryOperator::Mul; break; 3556 case tok::slash: Opc = BinaryOperator::Div; break; 3557 case tok::percent: Opc = BinaryOperator::Rem; break; 3558 case tok::plus: Opc = BinaryOperator::Add; break; 3559 case tok::minus: Opc = BinaryOperator::Sub; break; 3560 case tok::lessless: Opc = BinaryOperator::Shl; break; 3561 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 3562 case tok::lessequal: Opc = BinaryOperator::LE; break; 3563 case tok::less: Opc = BinaryOperator::LT; break; 3564 case tok::greaterequal: Opc = BinaryOperator::GE; break; 3565 case tok::greater: Opc = BinaryOperator::GT; break; 3566 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 3567 case tok::equalequal: Opc = BinaryOperator::EQ; break; 3568 case tok::amp: Opc = BinaryOperator::And; break; 3569 case tok::caret: Opc = BinaryOperator::Xor; break; 3570 case tok::pipe: Opc = BinaryOperator::Or; break; 3571 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 3572 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 3573 case tok::equal: Opc = BinaryOperator::Assign; break; 3574 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 3575 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 3576 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 3577 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 3578 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 3579 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 3580 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 3581 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 3582 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 3583 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 3584 case tok::comma: Opc = BinaryOperator::Comma; break; 3585 } 3586 return Opc; 3587} 3588 3589static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 3590 tok::TokenKind Kind) { 3591 UnaryOperator::Opcode Opc; 3592 switch (Kind) { 3593 default: assert(0 && "Unknown unary op!"); 3594 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 3595 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 3596 case tok::amp: Opc = UnaryOperator::AddrOf; break; 3597 case tok::star: Opc = UnaryOperator::Deref; break; 3598 case tok::plus: Opc = UnaryOperator::Plus; break; 3599 case tok::minus: Opc = UnaryOperator::Minus; break; 3600 case tok::tilde: Opc = UnaryOperator::Not; break; 3601 case tok::exclaim: Opc = UnaryOperator::LNot; break; 3602 case tok::kw___real: Opc = UnaryOperator::Real; break; 3603 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 3604 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 3605 } 3606 return Opc; 3607} 3608 3609/// CreateBuiltinBinOp - Creates a new built-in binary operation with 3610/// operator @p Opc at location @c TokLoc. This routine only supports 3611/// built-in operations; ActOnBinOp handles overloaded operators. 3612Action::OwningExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 3613 unsigned Op, 3614 Expr *lhs, Expr *rhs) { 3615 QualType ResultTy; // Result type of the binary operator. 3616 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 3617 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 3618 3619 switch (Opc) { 3620 default: 3621 assert(0 && "Unknown binary expr!"); 3622 case BinaryOperator::Assign: 3623 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 3624 break; 3625 case BinaryOperator::PtrMemD: 3626 case BinaryOperator::PtrMemI: 3627 ResultTy = CheckPointerToMemberOperands(lhs, rhs, OpLoc, 3628 Opc == BinaryOperator::PtrMemI); 3629 break; 3630 case BinaryOperator::Mul: 3631 case BinaryOperator::Div: 3632 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 3633 break; 3634 case BinaryOperator::Rem: 3635 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 3636 break; 3637 case BinaryOperator::Add: 3638 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 3639 break; 3640 case BinaryOperator::Sub: 3641 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 3642 break; 3643 case BinaryOperator::Shl: 3644 case BinaryOperator::Shr: 3645 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 3646 break; 3647 case BinaryOperator::LE: 3648 case BinaryOperator::LT: 3649 case BinaryOperator::GE: 3650 case BinaryOperator::GT: 3651 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 3652 break; 3653 case BinaryOperator::EQ: 3654 case BinaryOperator::NE: 3655 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 3656 break; 3657 case BinaryOperator::And: 3658 case BinaryOperator::Xor: 3659 case BinaryOperator::Or: 3660 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 3661 break; 3662 case BinaryOperator::LAnd: 3663 case BinaryOperator::LOr: 3664 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 3665 break; 3666 case BinaryOperator::MulAssign: 3667 case BinaryOperator::DivAssign: 3668 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 3669 if (!CompTy.isNull()) 3670 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3671 break; 3672 case BinaryOperator::RemAssign: 3673 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 3674 if (!CompTy.isNull()) 3675 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3676 break; 3677 case BinaryOperator::AddAssign: 3678 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 3679 if (!CompTy.isNull()) 3680 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3681 break; 3682 case BinaryOperator::SubAssign: 3683 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 3684 if (!CompTy.isNull()) 3685 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3686 break; 3687 case BinaryOperator::ShlAssign: 3688 case BinaryOperator::ShrAssign: 3689 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 3690 if (!CompTy.isNull()) 3691 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3692 break; 3693 case BinaryOperator::AndAssign: 3694 case BinaryOperator::XorAssign: 3695 case BinaryOperator::OrAssign: 3696 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 3697 if (!CompTy.isNull()) 3698 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3699 break; 3700 case BinaryOperator::Comma: 3701 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 3702 break; 3703 } 3704 if (ResultTy.isNull()) 3705 return ExprError(); 3706 if (CompTy.isNull()) 3707 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc)); 3708 else 3709 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, ResultTy, 3710 CompTy, OpLoc)); 3711} 3712 3713// Binary Operators. 'Tok' is the token for the operator. 3714Action::OwningExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 3715 tok::TokenKind Kind, 3716 ExprArg LHS, ExprArg RHS) { 3717 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 3718 Expr *lhs = (Expr *)LHS.release(), *rhs = (Expr*)RHS.release(); 3719 3720 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 3721 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 3722 3723 // If either expression is type-dependent, just build the AST. 3724 // FIXME: We'll need to perform some caching of the result of name 3725 // lookup for operator+. 3726 if (lhs->isTypeDependent() || rhs->isTypeDependent()) { 3727 if (Opc > BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) 3728 return Owned(new (Context) CompoundAssignOperator(lhs, rhs, Opc, 3729 Context.DependentTy, 3730 Context.DependentTy, TokLoc)); 3731 else 3732 return Owned(new (Context) BinaryOperator(lhs, rhs, Opc, 3733 Context.DependentTy, TokLoc)); 3734 } 3735 3736 if (getLangOptions().CPlusPlus && Opc != BinaryOperator::PtrMemD && 3737 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 3738 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 3739 // If this is one of the assignment operators, we only perform 3740 // overload resolution if the left-hand side is a class or 3741 // enumeration type (C++ [expr.ass]p3). 3742 if (Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign && 3743 !(lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType())) { 3744 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3745 } 3746 3747 // Determine which overloaded operator we're dealing with. 3748 static const OverloadedOperatorKind OverOps[] = { 3749 // Overloading .* is not possible. 3750 static_cast<OverloadedOperatorKind>(0), OO_ArrowStar, 3751 OO_Star, OO_Slash, OO_Percent, 3752 OO_Plus, OO_Minus, 3753 OO_LessLess, OO_GreaterGreater, 3754 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 3755 OO_EqualEqual, OO_ExclaimEqual, 3756 OO_Amp, 3757 OO_Caret, 3758 OO_Pipe, 3759 OO_AmpAmp, 3760 OO_PipePipe, 3761 OO_Equal, OO_StarEqual, 3762 OO_SlashEqual, OO_PercentEqual, 3763 OO_PlusEqual, OO_MinusEqual, 3764 OO_LessLessEqual, OO_GreaterGreaterEqual, 3765 OO_AmpEqual, OO_CaretEqual, 3766 OO_PipeEqual, 3767 OO_Comma 3768 }; 3769 OverloadedOperatorKind OverOp = OverOps[Opc]; 3770 3771 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3772 // to the candidate set. 3773 OverloadCandidateSet CandidateSet; 3774 Expr *Args[2] = { lhs, rhs }; 3775 if (AddOperatorCandidates(OverOp, S, TokLoc, Args, 2, CandidateSet)) 3776 return ExprError(); 3777 3778 // Perform overload resolution. 3779 OverloadCandidateSet::iterator Best; 3780 switch (BestViableFunction(CandidateSet, Best)) { 3781 case OR_Success: { 3782 // We found a built-in operator or an overloaded operator. 3783 FunctionDecl *FnDecl = Best->Function; 3784 3785 if (FnDecl) { 3786 // We matched an overloaded operator. Build a call to that 3787 // operator. 3788 3789 // Convert the arguments. 3790 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3791 if (PerformObjectArgumentInitialization(lhs, Method) || 3792 PerformCopyInitialization(rhs, FnDecl->getParamDecl(0)->getType(), 3793 "passing")) 3794 return ExprError(); 3795 } else { 3796 // Convert the arguments. 3797 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 3798 "passing") || 3799 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 3800 "passing")) 3801 return ExprError(); 3802 } 3803 3804 // Determine the result type 3805 QualType ResultTy 3806 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3807 ResultTy = ResultTy.getNonReferenceType(); 3808 3809 // Build the actual expression node. 3810 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 3811 SourceLocation()); 3812 UsualUnaryConversions(FnExpr); 3813 3814 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, Args, 2, 3815 ResultTy, TokLoc)); 3816 } else { 3817 // We matched a built-in operator. Convert the arguments, then 3818 // break out so that we will build the appropriate built-in 3819 // operator node. 3820 if (PerformImplicitConversion(lhs, Best->BuiltinTypes.ParamTypes[0], 3821 Best->Conversions[0], "passing") || 3822 PerformImplicitConversion(rhs, Best->BuiltinTypes.ParamTypes[1], 3823 Best->Conversions[1], "passing")) 3824 return ExprError(); 3825 3826 break; 3827 } 3828 } 3829 3830 case OR_No_Viable_Function: 3831 // No viable function; fall through to handling this as a 3832 // built-in operator, which will produce an error message for us. 3833 break; 3834 3835 case OR_Ambiguous: 3836 Diag(TokLoc, diag::err_ovl_ambiguous_oper) 3837 << BinaryOperator::getOpcodeStr(Opc) 3838 << lhs->getSourceRange() << rhs->getSourceRange(); 3839 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3840 return ExprError(); 3841 } 3842 3843 // Either we found no viable overloaded operator or we matched a 3844 // built-in operator. In either case, fall through to trying to 3845 // build a built-in operation. 3846 } 3847 3848 // Build a built-in binary operation. 3849 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3850} 3851 3852// Unary Operators. 'Tok' is the token for the operator. 3853Action::OwningExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 3854 tok::TokenKind Op, ExprArg input) { 3855 // FIXME: Input is modified later, but smart pointer not reassigned. 3856 Expr *Input = (Expr*)input.get(); 3857 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 3858 3859 if (getLangOptions().CPlusPlus && 3860 (Input->getType()->isRecordType() 3861 || Input->getType()->isEnumeralType())) { 3862 // Determine which overloaded operator we're dealing with. 3863 static const OverloadedOperatorKind OverOps[] = { 3864 OO_None, OO_None, 3865 OO_PlusPlus, OO_MinusMinus, 3866 OO_Amp, OO_Star, 3867 OO_Plus, OO_Minus, 3868 OO_Tilde, OO_Exclaim, 3869 OO_None, OO_None, 3870 OO_None, 3871 OO_None 3872 }; 3873 OverloadedOperatorKind OverOp = OverOps[Opc]; 3874 3875 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3876 // to the candidate set. 3877 OverloadCandidateSet CandidateSet; 3878 if (OverOp != OO_None && 3879 AddOperatorCandidates(OverOp, S, OpLoc, &Input, 1, CandidateSet)) 3880 return ExprError(); 3881 3882 // Perform overload resolution. 3883 OverloadCandidateSet::iterator Best; 3884 switch (BestViableFunction(CandidateSet, Best)) { 3885 case OR_Success: { 3886 // We found a built-in operator or an overloaded operator. 3887 FunctionDecl *FnDecl = Best->Function; 3888 3889 if (FnDecl) { 3890 // We matched an overloaded operator. Build a call to that 3891 // operator. 3892 3893 // Convert the arguments. 3894 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3895 if (PerformObjectArgumentInitialization(Input, Method)) 3896 return ExprError(); 3897 } else { 3898 // Convert the arguments. 3899 if (PerformCopyInitialization(Input, 3900 FnDecl->getParamDecl(0)->getType(), 3901 "passing")) 3902 return ExprError(); 3903 } 3904 3905 // Determine the result type 3906 QualType ResultTy 3907 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3908 ResultTy = ResultTy.getNonReferenceType(); 3909 3910 // Build the actual expression node. 3911 Expr *FnExpr = new (Context) DeclRefExpr(FnDecl, FnDecl->getType(), 3912 SourceLocation()); 3913 UsualUnaryConversions(FnExpr); 3914 3915 input.release(); 3916 return Owned(new (Context) CXXOperatorCallExpr(Context, FnExpr, &Input, 1, 3917 ResultTy, OpLoc)); 3918 } else { 3919 // We matched a built-in operator. Convert the arguments, then 3920 // break out so that we will build the appropriate built-in 3921 // operator node. 3922 if (PerformImplicitConversion(Input, Best->BuiltinTypes.ParamTypes[0], 3923 Best->Conversions[0], "passing")) 3924 return ExprError(); 3925 3926 break; 3927 } 3928 } 3929 3930 case OR_No_Viable_Function: 3931 // No viable function; fall through to handling this as a 3932 // built-in operator, which will produce an error message for us. 3933 break; 3934 3935 case OR_Ambiguous: 3936 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 3937 << UnaryOperator::getOpcodeStr(Opc) 3938 << Input->getSourceRange(); 3939 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3940 return ExprError(); 3941 } 3942 3943 // Either we found no viable overloaded operator or we matched a 3944 // built-in operator. In either case, fall through to trying to 3945 // build a built-in operation. 3946 } 3947 3948 QualType resultType; 3949 switch (Opc) { 3950 default: 3951 assert(0 && "Unimplemented unary expr!"); 3952 case UnaryOperator::PreInc: 3953 case UnaryOperator::PreDec: 3954 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 3955 Opc == UnaryOperator::PreInc); 3956 break; 3957 case UnaryOperator::AddrOf: 3958 resultType = CheckAddressOfOperand(Input, OpLoc); 3959 break; 3960 case UnaryOperator::Deref: 3961 DefaultFunctionArrayConversion(Input); 3962 resultType = CheckIndirectionOperand(Input, OpLoc); 3963 break; 3964 case UnaryOperator::Plus: 3965 case UnaryOperator::Minus: 3966 UsualUnaryConversions(Input); 3967 resultType = Input->getType(); 3968 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 3969 break; 3970 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 3971 resultType->isEnumeralType()) 3972 break; 3973 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 3974 Opc == UnaryOperator::Plus && 3975 resultType->isPointerType()) 3976 break; 3977 3978 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 3979 << resultType << Input->getSourceRange()); 3980 case UnaryOperator::Not: // bitwise complement 3981 UsualUnaryConversions(Input); 3982 resultType = Input->getType(); 3983 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 3984 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 3985 // C99 does not support '~' for complex conjugation. 3986 Diag(OpLoc, diag::ext_integer_complement_complex) 3987 << resultType << Input->getSourceRange(); 3988 else if (!resultType->isIntegerType()) 3989 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 3990 << resultType << Input->getSourceRange()); 3991 break; 3992 case UnaryOperator::LNot: // logical negation 3993 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 3994 DefaultFunctionArrayConversion(Input); 3995 resultType = Input->getType(); 3996 if (!resultType->isScalarType()) // C99 6.5.3.3p1 3997 return ExprError(Diag(OpLoc, diag::err_typecheck_unary_expr) 3998 << resultType << Input->getSourceRange()); 3999 // LNot always has type int. C99 6.5.3.3p5. 4000 // In C++, it's bool. C++ 5.3.1p8 4001 resultType = getLangOptions().CPlusPlus ? Context.BoolTy : Context.IntTy; 4002 break; 4003 case UnaryOperator::Real: 4004 case UnaryOperator::Imag: 4005 resultType = CheckRealImagOperand(Input, OpLoc); 4006 break; 4007 case UnaryOperator::Extension: 4008 resultType = Input->getType(); 4009 break; 4010 } 4011 if (resultType.isNull()) 4012 return ExprError(); 4013 input.release(); 4014 return Owned(new (Context) UnaryOperator(Input, Opc, resultType, OpLoc)); 4015} 4016 4017/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 4018Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 4019 SourceLocation LabLoc, 4020 IdentifierInfo *LabelII) { 4021 // Look up the record for this label identifier. 4022 LabelStmt *&LabelDecl = LabelMap[LabelII]; 4023 4024 // If we haven't seen this label yet, create a forward reference. It 4025 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 4026 if (LabelDecl == 0) 4027 LabelDecl = new (Context) LabelStmt(LabLoc, LabelII, 0); 4028 4029 // Create the AST node. The address of a label always has type 'void*'. 4030 return new (Context) AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 4031 Context.getPointerType(Context.VoidTy)); 4032} 4033 4034Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 4035 SourceLocation RPLoc) { // "({..})" 4036 Stmt *SubStmt = static_cast<Stmt*>(substmt); 4037 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 4038 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 4039 4040 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 4041 if (isFileScope) { 4042 return Diag(LPLoc, diag::err_stmtexpr_file_scope); 4043 } 4044 4045 // FIXME: there are a variety of strange constraints to enforce here, for 4046 // example, it is not possible to goto into a stmt expression apparently. 4047 // More semantic analysis is needed. 4048 4049 // FIXME: the last statement in the compount stmt has its value used. We 4050 // should not warn about it being unused. 4051 4052 // If there are sub stmts in the compound stmt, take the type of the last one 4053 // as the type of the stmtexpr. 4054 QualType Ty = Context.VoidTy; 4055 4056 if (!Compound->body_empty()) { 4057 Stmt *LastStmt = Compound->body_back(); 4058 // If LastStmt is a label, skip down through into the body. 4059 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 4060 LastStmt = Label->getSubStmt(); 4061 4062 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 4063 Ty = LastExpr->getType(); 4064 } 4065 4066 return new (Context) StmtExpr(Compound, Ty, LPLoc, RPLoc); 4067} 4068 4069Sema::ExprResult Sema::ActOnBuiltinOffsetOf(Scope *S, 4070 SourceLocation BuiltinLoc, 4071 SourceLocation TypeLoc, 4072 TypeTy *argty, 4073 OffsetOfComponent *CompPtr, 4074 unsigned NumComponents, 4075 SourceLocation RPLoc) { 4076 QualType ArgTy = QualType::getFromOpaquePtr(argty); 4077 assert(!ArgTy.isNull() && "Missing type argument!"); 4078 4079 // We must have at least one component that refers to the type, and the first 4080 // one is known to be a field designator. Verify that the ArgTy represents 4081 // a struct/union/class. 4082 if (!ArgTy->isRecordType()) 4083 return Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy; 4084 4085 // Otherwise, create a compound literal expression as the base, and 4086 // iteratively process the offsetof designators. 4087 InitListExpr *IList = 4088 new (Context) InitListExpr(SourceLocation(), 0, 0, SourceLocation()); 4089 IList->setType(ArgTy); 4090 Expr *Res = 4091 new (Context) CompoundLiteralExpr(SourceLocation(), ArgTy, IList, false); 4092 4093 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 4094 // GCC extension, diagnose them. 4095 if (NumComponents != 1) 4096 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 4097 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 4098 4099 for (unsigned i = 0; i != NumComponents; ++i) { 4100 const OffsetOfComponent &OC = CompPtr[i]; 4101 if (OC.isBrackets) { 4102 // Offset of an array sub-field. TODO: Should we allow vector elements? 4103 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 4104 if (!AT) { 4105 Res->Destroy(Context); 4106 return Diag(OC.LocEnd, diag::err_offsetof_array_type) << Res->getType(); 4107 } 4108 4109 // FIXME: C++: Verify that operator[] isn't overloaded. 4110 4111 // C99 6.5.2.1p1 4112 Expr *Idx = static_cast<Expr*>(OC.U.E); 4113 if (!Idx->getType()->isIntegerType()) 4114 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript) 4115 << Idx->getSourceRange(); 4116 4117 Res = new (Context) ArraySubscriptExpr(Res, Idx, AT->getElementType(), 4118 OC.LocEnd); 4119 continue; 4120 } 4121 4122 const RecordType *RC = Res->getType()->getAsRecordType(); 4123 if (!RC) { 4124 Res->Destroy(Context); 4125 return Diag(OC.LocEnd, diag::err_offsetof_record_type) << Res->getType(); 4126 } 4127 4128 // Get the decl corresponding to this. 4129 RecordDecl *RD = RC->getDecl(); 4130 FieldDecl *MemberDecl 4131 = dyn_cast_or_null<FieldDecl>(LookupQualifiedName(RD, OC.U.IdentInfo, 4132 LookupMemberName) 4133 .getAsDecl()); 4134 if (!MemberDecl) 4135 return Diag(BuiltinLoc, diag::err_typecheck_no_member) 4136 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd); 4137 4138 // FIXME: C++: Verify that MemberDecl isn't a static field. 4139 // FIXME: Verify that MemberDecl isn't a bitfield. 4140 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 4141 // matter here. 4142 Res = new (Context) MemberExpr(Res, false, MemberDecl, OC.LocEnd, 4143 MemberDecl->getType().getNonReferenceType()); 4144 } 4145 4146 return new (Context) UnaryOperator(Res, UnaryOperator::OffsetOf, 4147 Context.getSizeType(), BuiltinLoc); 4148} 4149 4150 4151Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 4152 TypeTy *arg1, TypeTy *arg2, 4153 SourceLocation RPLoc) { 4154 QualType argT1 = QualType::getFromOpaquePtr(arg1); 4155 QualType argT2 = QualType::getFromOpaquePtr(arg2); 4156 4157 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 4158 4159 return new (Context) TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, 4160 argT2, RPLoc); 4161} 4162 4163Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 4164 ExprTy *expr1, ExprTy *expr2, 4165 SourceLocation RPLoc) { 4166 Expr *CondExpr = static_cast<Expr*>(cond); 4167 Expr *LHSExpr = static_cast<Expr*>(expr1); 4168 Expr *RHSExpr = static_cast<Expr*>(expr2); 4169 4170 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 4171 4172 // The conditional expression is required to be a constant expression. 4173 llvm::APSInt condEval(32); 4174 SourceLocation ExpLoc; 4175 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 4176 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant) 4177 << CondExpr->getSourceRange(); 4178 4179 // If the condition is > zero, then the AST type is the same as the LSHExpr. 4180 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 4181 RHSExpr->getType(); 4182 return new (Context) ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, 4183 resType, RPLoc); 4184} 4185 4186//===----------------------------------------------------------------------===// 4187// Clang Extensions. 4188//===----------------------------------------------------------------------===// 4189 4190/// ActOnBlockStart - This callback is invoked when a block literal is started. 4191void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 4192 // Analyze block parameters. 4193 BlockSemaInfo *BSI = new BlockSemaInfo(); 4194 4195 // Add BSI to CurBlock. 4196 BSI->PrevBlockInfo = CurBlock; 4197 CurBlock = BSI; 4198 4199 BSI->ReturnType = 0; 4200 BSI->TheScope = BlockScope; 4201 4202 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 4203 PushDeclContext(BlockScope, BSI->TheDecl); 4204} 4205 4206void Sema::ActOnBlockArguments(Declarator &ParamInfo, Scope *CurScope) { 4207 assert(ParamInfo.getIdentifier() == 0 && "block-id should have no identifier!"); 4208 4209 if (ParamInfo.getNumTypeObjects() == 0 4210 || ParamInfo.getTypeObject(0).Kind != DeclaratorChunk::Function) { 4211 QualType T = GetTypeForDeclarator(ParamInfo, CurScope); 4212 4213 // The type is entirely optional as well, if none, use DependentTy. 4214 if (T.isNull()) 4215 T = Context.DependentTy; 4216 4217 // The parameter list is optional, if there was none, assume (). 4218 if (!T->isFunctionType()) 4219 T = Context.getFunctionType(T, NULL, 0, 0, 0); 4220 4221 CurBlock->hasPrototype = true; 4222 CurBlock->isVariadic = false; 4223 Type *RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4224 .getTypePtr(); 4225 4226 if (!RetTy->isDependentType()) 4227 CurBlock->ReturnType = RetTy; 4228 return; 4229 } 4230 4231 // Analyze arguments to block. 4232 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 4233 "Not a function declarator!"); 4234 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 4235 4236 CurBlock->hasPrototype = FTI.hasPrototype; 4237 CurBlock->isVariadic = true; 4238 4239 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 4240 // no arguments, not a function that takes a single void argument. 4241 if (FTI.hasPrototype && 4242 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4243 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 4244 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 4245 // empty arg list, don't push any params. 4246 CurBlock->isVariadic = false; 4247 } else if (FTI.hasPrototype) { 4248 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 4249 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 4250 CurBlock->isVariadic = FTI.isVariadic; 4251 QualType T = GetTypeForDeclarator (ParamInfo, CurScope); 4252 4253 Type* RetTy = T.getTypePtr()->getAsFunctionType()->getResultType() 4254 .getTypePtr(); 4255 4256 if (!RetTy->isDependentType()) 4257 CurBlock->ReturnType = RetTy; 4258 } 4259 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 4260 4261 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 4262 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 4263 // If this has an identifier, add it to the scope stack. 4264 if ((*AI)->getIdentifier()) 4265 PushOnScopeChains(*AI, CurBlock->TheScope); 4266} 4267 4268/// ActOnBlockError - If there is an error parsing a block, this callback 4269/// is invoked to pop the information about the block from the action impl. 4270void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 4271 // Ensure that CurBlock is deleted. 4272 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 4273 4274 // Pop off CurBlock, handle nested blocks. 4275 CurBlock = CurBlock->PrevBlockInfo; 4276 4277 // FIXME: Delete the ParmVarDecl objects as well??? 4278 4279} 4280 4281/// ActOnBlockStmtExpr - This is called when the body of a block statement 4282/// literal was successfully completed. ^(int x){...} 4283Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 4284 Scope *CurScope) { 4285 // Ensure that CurBlock is deleted. 4286 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 4287 ExprOwningPtr<CompoundStmt> Body(this, static_cast<CompoundStmt*>(body)); 4288 4289 PopDeclContext(); 4290 4291 // Pop off CurBlock, handle nested blocks. 4292 CurBlock = CurBlock->PrevBlockInfo; 4293 4294 QualType RetTy = Context.VoidTy; 4295 if (BSI->ReturnType) 4296 RetTy = QualType(BSI->ReturnType, 0); 4297 4298 llvm::SmallVector<QualType, 8> ArgTypes; 4299 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 4300 ArgTypes.push_back(BSI->Params[i]->getType()); 4301 4302 QualType BlockTy; 4303 if (!BSI->hasPrototype) 4304 BlockTy = Context.getFunctionTypeNoProto(RetTy); 4305 else 4306 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 4307 BSI->isVariadic, 0); 4308 4309 BlockTy = Context.getBlockPointerType(BlockTy); 4310 4311 BSI->TheDecl->setBody(Body.take()); 4312 return new (Context) BlockExpr(BSI->TheDecl, BlockTy); 4313} 4314 4315/// ExprsMatchFnType - return true if the Exprs in array Args have 4316/// QualTypes that match the QualTypes of the arguments of the FnType. 4317/// The number of arguments has already been validated to match the number of 4318/// arguments in FnType. 4319static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 4320 ASTContext &Context) { 4321 unsigned NumParams = FnType->getNumArgs(); 4322 for (unsigned i = 0; i != NumParams; ++i) { 4323 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 4324 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 4325 4326 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 4327 return false; 4328 } 4329 return true; 4330} 4331 4332Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 4333 SourceLocation *CommaLocs, 4334 SourceLocation BuiltinLoc, 4335 SourceLocation RParenLoc) { 4336 // __builtin_overload requires at least 2 arguments 4337 if (NumArgs < 2) 4338 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 4339 << SourceRange(BuiltinLoc, RParenLoc); 4340 4341 // The first argument is required to be a constant expression. It tells us 4342 // the number of arguments to pass to each of the functions to be overloaded. 4343 Expr **Args = reinterpret_cast<Expr**>(args); 4344 Expr *NParamsExpr = Args[0]; 4345 llvm::APSInt constEval(32); 4346 SourceLocation ExpLoc; 4347 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 4348 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 4349 << NParamsExpr->getSourceRange(); 4350 4351 // Verify that the number of parameters is > 0 4352 unsigned NumParams = constEval.getZExtValue(); 4353 if (NumParams == 0) 4354 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 4355 << NParamsExpr->getSourceRange(); 4356 // Verify that we have at least 1 + NumParams arguments to the builtin. 4357 if ((NumParams + 1) > NumArgs) 4358 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 4359 << SourceRange(BuiltinLoc, RParenLoc); 4360 4361 // Figure out the return type, by matching the args to one of the functions 4362 // listed after the parameters. 4363 OverloadExpr *OE = 0; 4364 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 4365 // UsualUnaryConversions will convert the function DeclRefExpr into a 4366 // pointer to function. 4367 Expr *Fn = UsualUnaryConversions(Args[i]); 4368 const FunctionTypeProto *FnType = 0; 4369 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 4370 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 4371 4372 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 4373 // parameters, and the number of parameters must match the value passed to 4374 // the builtin. 4375 if (!FnType || (FnType->getNumArgs() != NumParams)) 4376 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype) 4377 << Fn->getSourceRange(); 4378 4379 // Scan the parameter list for the FunctionType, checking the QualType of 4380 // each parameter against the QualTypes of the arguments to the builtin. 4381 // If they match, return a new OverloadExpr. 4382 if (ExprsMatchFnType(Args+1, FnType, Context)) { 4383 if (OE) 4384 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match) 4385 << OE->getFn()->getSourceRange(); 4386 // Remember our match, and continue processing the remaining arguments 4387 // to catch any errors. 4388 OE = new (Context) OverloadExpr(Context, Args, NumArgs, i, 4389 FnType->getResultType().getNonReferenceType(), 4390 BuiltinLoc, RParenLoc); 4391 } 4392 } 4393 // Return the newly created OverloadExpr node, if we succeded in matching 4394 // exactly one of the candidate functions. 4395 if (OE) 4396 return OE; 4397 4398 // If we didn't find a matching function Expr in the __builtin_overload list 4399 // the return an error. 4400 std::string typeNames; 4401 for (unsigned i = 0; i != NumParams; ++i) { 4402 if (i != 0) typeNames += ", "; 4403 typeNames += Args[i+1]->getType().getAsString(); 4404 } 4405 4406 return Diag(BuiltinLoc, diag::err_overload_no_match) 4407 << typeNames << SourceRange(BuiltinLoc, RParenLoc); 4408} 4409 4410Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 4411 ExprTy *expr, TypeTy *type, 4412 SourceLocation RPLoc) { 4413 Expr *E = static_cast<Expr*>(expr); 4414 QualType T = QualType::getFromOpaquePtr(type); 4415 4416 InitBuiltinVaListType(); 4417 4418 // Get the va_list type 4419 QualType VaListType = Context.getBuiltinVaListType(); 4420 // Deal with implicit array decay; for example, on x86-64, 4421 // va_list is an array, but it's supposed to decay to 4422 // a pointer for va_arg. 4423 if (VaListType->isArrayType()) 4424 VaListType = Context.getArrayDecayedType(VaListType); 4425 // Make sure the input expression also decays appropriately. 4426 UsualUnaryConversions(E); 4427 4428 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 4429 return Diag(E->getLocStart(), 4430 diag::err_first_argument_to_va_arg_not_of_type_va_list) 4431 << E->getType() << E->getSourceRange(); 4432 4433 // FIXME: Warn if a non-POD type is passed in. 4434 4435 return new (Context) VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 4436} 4437 4438Sema::ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 4439 // The type of __null will be int or long, depending on the size of 4440 // pointers on the target. 4441 QualType Ty; 4442 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 4443 Ty = Context.IntTy; 4444 else 4445 Ty = Context.LongTy; 4446 4447 return new (Context) GNUNullExpr(Ty, TokenLoc); 4448} 4449 4450bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 4451 SourceLocation Loc, 4452 QualType DstType, QualType SrcType, 4453 Expr *SrcExpr, const char *Flavor) { 4454 // Decode the result (notice that AST's are still created for extensions). 4455 bool isInvalid = false; 4456 unsigned DiagKind; 4457 switch (ConvTy) { 4458 default: assert(0 && "Unknown conversion type"); 4459 case Compatible: return false; 4460 case PointerToInt: 4461 DiagKind = diag::ext_typecheck_convert_pointer_int; 4462 break; 4463 case IntToPointer: 4464 DiagKind = diag::ext_typecheck_convert_int_pointer; 4465 break; 4466 case IncompatiblePointer: 4467 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 4468 break; 4469 case FunctionVoidPointer: 4470 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 4471 break; 4472 case CompatiblePointerDiscardsQualifiers: 4473 // If the qualifiers lost were because we were applying the 4474 // (deprecated) C++ conversion from a string literal to a char* 4475 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 4476 // Ideally, this check would be performed in 4477 // CheckPointerTypesForAssignment. However, that would require a 4478 // bit of refactoring (so that the second argument is an 4479 // expression, rather than a type), which should be done as part 4480 // of a larger effort to fix CheckPointerTypesForAssignment for 4481 // C++ semantics. 4482 if (getLangOptions().CPlusPlus && 4483 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 4484 return false; 4485 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 4486 break; 4487 case IntToBlockPointer: 4488 DiagKind = diag::err_int_to_block_pointer; 4489 break; 4490 case IncompatibleBlockPointer: 4491 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 4492 break; 4493 case IncompatibleObjCQualifiedId: 4494 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 4495 // it can give a more specific diagnostic. 4496 DiagKind = diag::warn_incompatible_qualified_id; 4497 break; 4498 case IncompatibleVectors: 4499 DiagKind = diag::warn_incompatible_vectors; 4500 break; 4501 case Incompatible: 4502 DiagKind = diag::err_typecheck_convert_incompatible; 4503 isInvalid = true; 4504 break; 4505 } 4506 4507 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 4508 << SrcExpr->getSourceRange(); 4509 return isInvalid; 4510} 4511 4512bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 4513{ 4514 Expr::EvalResult EvalResult; 4515 4516 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 4517 EvalResult.HasSideEffects) { 4518 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 4519 4520 if (EvalResult.Diag) { 4521 // We only show the note if it's not the usual "invalid subexpression" 4522 // or if it's actually in a subexpression. 4523 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 4524 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 4525 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4526 } 4527 4528 return true; 4529 } 4530 4531 if (EvalResult.Diag) { 4532 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 4533 E->getSourceRange(); 4534 4535 // Print the reason it's not a constant. 4536 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4537 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4538 } 4539 4540 if (Result) 4541 *Result = EvalResult.Val.getInt(); 4542 return false; 4543} 4544