SemaExpr.cpp revision 0440c8c2163d60db45ae42aec602f03e7f25622c
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/Lex/Preprocessor.h" 20#include "clang/Lex/LiteralSupport.h" 21#include "clang/Basic/Diagnostic.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// Standard Promotions and Conversions 31//===----------------------------------------------------------------------===// 32 33/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 34void Sema::DefaultFunctionArrayConversion(Expr *&E) { 35 QualType Ty = E->getType(); 36 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 37 38 if (Ty->isFunctionType()) 39 ImpCastExprToType(E, Context.getPointerType(Ty)); 40 else if (Ty->isArrayType()) { 41 // In C90 mode, arrays only promote to pointers if the array expression is 42 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 43 // type 'array of type' is converted to an expression that has type 'pointer 44 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 45 // that has type 'array of type' ...". The relevant change is "an lvalue" 46 // (C90) to "an expression" (C99). 47 // 48 // C++ 4.2p1: 49 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 50 // T" can be converted to an rvalue of type "pointer to T". 51 // 52 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 53 E->isLvalue(Context) == Expr::LV_Valid) 54 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 55 } 56} 57 58/// UsualUnaryConversions - Performs various conversions that are common to most 59/// operators (C99 6.3). The conversions of array and function types are 60/// sometimes surpressed. For example, the array->pointer conversion doesn't 61/// apply if the array is an argument to the sizeof or address (&) operators. 62/// In these instances, this routine should *not* be called. 63Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 64 QualType Ty = Expr->getType(); 65 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 66 67 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 68 ImpCastExprToType(Expr, Context.IntTy); 69 else 70 DefaultFunctionArrayConversion(Expr); 71 72 return Expr; 73} 74 75/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 76/// do not have a prototype. Arguments that have type float are promoted to 77/// double. All other argument types are converted by UsualUnaryConversions(). 78void Sema::DefaultArgumentPromotion(Expr *&Expr) { 79 QualType Ty = Expr->getType(); 80 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 81 82 // If this is a 'float' (CVR qualified or typedef) promote to double. 83 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 84 if (BT->getKind() == BuiltinType::Float) 85 return ImpCastExprToType(Expr, Context.DoubleTy); 86 87 UsualUnaryConversions(Expr); 88} 89 90/// UsualArithmeticConversions - Performs various conversions that are common to 91/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 92/// routine returns the first non-arithmetic type found. The client is 93/// responsible for emitting appropriate error diagnostics. 94/// FIXME: verify the conversion rules for "complex int" are consistent with 95/// GCC. 96QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 97 bool isCompAssign) { 98 if (!isCompAssign) { 99 UsualUnaryConversions(lhsExpr); 100 UsualUnaryConversions(rhsExpr); 101 } 102 103 // For conversion purposes, we ignore any qualifiers. 104 // For example, "const float" and "float" are equivalent. 105 QualType lhs = 106 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 107 QualType rhs = 108 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 109 110 // If both types are identical, no conversion is needed. 111 if (lhs == rhs) 112 return lhs; 113 114 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 115 // The caller can deal with this (e.g. pointer + int). 116 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 117 return lhs; 118 119 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 120 if (!isCompAssign) { 121 ImpCastExprToType(lhsExpr, destType); 122 ImpCastExprToType(rhsExpr, destType); 123 } 124 return destType; 125} 126 127QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 128 // Perform the usual unary conversions. We do this early so that 129 // integral promotions to "int" can allow us to exit early, in the 130 // lhs == rhs check. Also, for conversion purposes, we ignore any 131 // qualifiers. For example, "const float" and "float" are 132 // equivalent. 133 if (lhs->isPromotableIntegerType()) lhs = Context.IntTy; 134 else lhs = lhs.getUnqualifiedType(); 135 if (rhs->isPromotableIntegerType()) rhs = Context.IntTy; 136 else rhs = rhs.getUnqualifiedType(); 137 138 // If both types are identical, no conversion is needed. 139 if (lhs == rhs) 140 return lhs; 141 142 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 143 // The caller can deal with this (e.g. pointer + int). 144 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 145 return lhs; 146 147 // At this point, we have two different arithmetic types. 148 149 // Handle complex types first (C99 6.3.1.8p1). 150 if (lhs->isComplexType() || rhs->isComplexType()) { 151 // if we have an integer operand, the result is the complex type. 152 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 153 // convert the rhs to the lhs complex type. 154 return lhs; 155 } 156 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 157 // convert the lhs to the rhs complex type. 158 return rhs; 159 } 160 // This handles complex/complex, complex/float, or float/complex. 161 // When both operands are complex, the shorter operand is converted to the 162 // type of the longer, and that is the type of the result. This corresponds 163 // to what is done when combining two real floating-point operands. 164 // The fun begins when size promotion occur across type domains. 165 // From H&S 6.3.4: When one operand is complex and the other is a real 166 // floating-point type, the less precise type is converted, within it's 167 // real or complex domain, to the precision of the other type. For example, 168 // when combining a "long double" with a "double _Complex", the 169 // "double _Complex" is promoted to "long double _Complex". 170 int result = Context.getFloatingTypeOrder(lhs, rhs); 171 172 if (result > 0) { // The left side is bigger, convert rhs. 173 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 174 } else if (result < 0) { // The right side is bigger, convert lhs. 175 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 176 } 177 // At this point, lhs and rhs have the same rank/size. Now, make sure the 178 // domains match. This is a requirement for our implementation, C99 179 // does not require this promotion. 180 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 181 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 182 return rhs; 183 } else { // handle "_Complex double, double". 184 return lhs; 185 } 186 } 187 return lhs; // The domain/size match exactly. 188 } 189 // Now handle "real" floating types (i.e. float, double, long double). 190 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 191 // if we have an integer operand, the result is the real floating type. 192 if (rhs->isIntegerType()) { 193 // convert rhs to the lhs floating point type. 194 return lhs; 195 } 196 if (rhs->isComplexIntegerType()) { 197 // convert rhs to the complex floating point type. 198 return Context.getComplexType(lhs); 199 } 200 if (lhs->isIntegerType()) { 201 // convert lhs to the rhs floating point type. 202 return rhs; 203 } 204 if (lhs->isComplexIntegerType()) { 205 // convert lhs to the complex floating point type. 206 return Context.getComplexType(rhs); 207 } 208 // We have two real floating types, float/complex combos were handled above. 209 // Convert the smaller operand to the bigger result. 210 int result = Context.getFloatingTypeOrder(lhs, rhs); 211 212 if (result > 0) { // convert the rhs 213 return lhs; 214 } 215 if (result < 0) { // convert the lhs 216 return rhs; 217 } 218 assert(0 && "Sema::UsualArithmeticConversionsType(): illegal float comparison"); 219 } 220 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 221 // Handle GCC complex int extension. 222 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 223 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 224 225 if (lhsComplexInt && rhsComplexInt) { 226 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 227 rhsComplexInt->getElementType()) >= 0) { 228 // convert the rhs 229 return lhs; 230 } 231 return rhs; 232 } else if (lhsComplexInt && rhs->isIntegerType()) { 233 // convert the rhs to the lhs complex type. 234 return lhs; 235 } else if (rhsComplexInt && lhs->isIntegerType()) { 236 // convert the lhs to the rhs complex type. 237 return rhs; 238 } 239 } 240 // Finally, we have two differing integer types. 241 // The rules for this case are in C99 6.3.1.8 242 int compare = Context.getIntegerTypeOrder(lhs, rhs); 243 bool lhsSigned = lhs->isSignedIntegerType(), 244 rhsSigned = rhs->isSignedIntegerType(); 245 QualType destType; 246 if (lhsSigned == rhsSigned) { 247 // Same signedness; use the higher-ranked type 248 destType = compare >= 0 ? lhs : rhs; 249 } else if (compare != (lhsSigned ? 1 : -1)) { 250 // The unsigned type has greater than or equal rank to the 251 // signed type, so use the unsigned type 252 destType = lhsSigned ? rhs : lhs; 253 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 254 // The two types are different widths; if we are here, that 255 // means the signed type is larger than the unsigned type, so 256 // use the signed type. 257 destType = lhsSigned ? lhs : rhs; 258 } else { 259 // The signed type is higher-ranked than the unsigned type, 260 // but isn't actually any bigger (like unsigned int and long 261 // on most 32-bit systems). Use the unsigned type corresponding 262 // to the signed type. 263 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 264 } 265 return destType; 266} 267 268//===----------------------------------------------------------------------===// 269// Semantic Analysis for various Expression Types 270//===----------------------------------------------------------------------===// 271 272 273/// ActOnStringLiteral - The specified tokens were lexed as pasted string 274/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 275/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 276/// multiple tokens. However, the common case is that StringToks points to one 277/// string. 278/// 279Action::ExprResult 280Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 281 assert(NumStringToks && "Must have at least one string!"); 282 283 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 284 if (Literal.hadError) 285 return ExprResult(true); 286 287 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 288 for (unsigned i = 0; i != NumStringToks; ++i) 289 StringTokLocs.push_back(StringToks[i].getLocation()); 290 291 // Verify that pascal strings aren't too large. 292 if (Literal.Pascal && Literal.GetStringLength() > 256) 293 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long) 294 << SourceRange(StringToks[0].getLocation(), 295 StringToks[NumStringToks-1].getLocation()); 296 297 QualType StrTy = Context.CharTy; 298 if (Literal.AnyWide) StrTy = Context.getWCharType(); 299 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 300 301 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 302 if (getLangOptions().CPlusPlus) 303 StrTy.addConst(); 304 305 // Get an array type for the string, according to C99 6.4.5. This includes 306 // the nul terminator character as well as the string length for pascal 307 // strings. 308 StrTy = Context.getConstantArrayType(StrTy, 309 llvm::APInt(32, Literal.GetStringLength()+1), 310 ArrayType::Normal, 0); 311 312 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 313 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 314 Literal.AnyWide, StrTy, 315 StringToks[0].getLocation(), 316 StringToks[NumStringToks-1].getLocation()); 317} 318 319/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 320/// CurBlock to VD should cause it to be snapshotted (as we do for auto 321/// variables defined outside the block) or false if this is not needed (e.g. 322/// for values inside the block or for globals). 323/// 324/// FIXME: This will create BlockDeclRefExprs for global variables, 325/// function references, etc which is suboptimal :) and breaks 326/// things like "integer constant expression" tests. 327static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 328 ValueDecl *VD) { 329 // If the value is defined inside the block, we couldn't snapshot it even if 330 // we wanted to. 331 if (CurBlock->TheDecl == VD->getDeclContext()) 332 return false; 333 334 // If this is an enum constant or function, it is constant, don't snapshot. 335 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 336 return false; 337 338 // If this is a reference to an extern, static, or global variable, no need to 339 // snapshot it. 340 // FIXME: What about 'const' variables in C++? 341 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 342 return Var->hasLocalStorage(); 343 344 return true; 345} 346 347 348 349/// ActOnIdentifierExpr - The parser read an identifier in expression context, 350/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 351/// identifier is used in a function call context. 352/// LookupCtx is only used for a C++ qualified-id (foo::bar) to indicate the 353/// class or namespace that the identifier must be a member of. 354Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 355 IdentifierInfo &II, 356 bool HasTrailingLParen, 357 const CXXScopeSpec *SS) { 358 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS); 359} 360 361/// ActOnDeclarationNameExpr - The parser has read some kind of name 362/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 363/// performs lookup on that name and returns an expression that refers 364/// to that name. This routine isn't directly called from the parser, 365/// because the parser doesn't know about DeclarationName. Rather, 366/// this routine is called by ActOnIdentifierExpr, 367/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 368/// which form the DeclarationName from the corresponding syntactic 369/// forms. 370/// 371/// HasTrailingLParen indicates whether this identifier is used in a 372/// function call context. LookupCtx is only used for a C++ 373/// qualified-id (foo::bar) to indicate the class or namespace that 374/// the identifier must be a member of. 375/// 376/// If ForceResolution is true, then we will attempt to resolve the 377/// name even if it looks like a dependent name. This option is off by 378/// default. 379Sema::ExprResult Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 380 DeclarationName Name, 381 bool HasTrailingLParen, 382 const CXXScopeSpec *SS, 383 bool ForceResolution) { 384 if (S->getTemplateParamParent() && Name.getAsIdentifierInfo() && 385 HasTrailingLParen && !SS && !ForceResolution) { 386 // We've seen something of the form 387 // identifier( 388 // and we are in a template, so it is likely that 's' is a 389 // dependent name. However, we won't know until we've parsed all 390 // of the call arguments. So, build a CXXDependentNameExpr node 391 // to represent this name. Then, if it turns out that none of the 392 // arguments are type-dependent, we'll force the resolution of the 393 // dependent name at that point. 394 return new CXXDependentNameExpr(Name.getAsIdentifierInfo(), 395 Context.DependentTy, Loc); 396 } 397 398 // Could be enum-constant, value decl, instance variable, etc. 399 Decl *D; 400 if (SS && !SS->isEmpty()) { 401 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 402 if (DC == 0) 403 return true; 404 D = LookupDecl(Name, Decl::IDNS_Ordinary, S, DC); 405 } else 406 D = LookupDecl(Name, Decl::IDNS_Ordinary, S); 407 408 // If this reference is in an Objective-C method, then ivar lookup happens as 409 // well. 410 IdentifierInfo *II = Name.getAsIdentifierInfo(); 411 if (II && getCurMethodDecl()) { 412 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 413 // There are two cases to handle here. 1) scoped lookup could have failed, 414 // in which case we should look for an ivar. 2) scoped lookup could have 415 // found a decl, but that decl is outside the current method (i.e. a global 416 // variable). In these two cases, we do a lookup for an ivar with this 417 // name, if the lookup suceeds, we replace it our current decl. 418 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 419 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 420 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II)) { 421 // FIXME: This should use a new expr for a direct reference, don't turn 422 // this into Self->ivar, just return a BareIVarExpr or something. 423 IdentifierInfo &II = Context.Idents.get("self"); 424 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 425 ObjCIvarRefExpr *MRef= new ObjCIvarRefExpr(IV, IV->getType(), Loc, 426 static_cast<Expr*>(SelfExpr.Val), true, true); 427 Context.setFieldDecl(IFace, IV, MRef); 428 return MRef; 429 } 430 } 431 // Needed to implement property "super.method" notation. 432 if (SD == 0 && II->isStr("super")) { 433 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 434 getCurMethodDecl()->getClassInterface())); 435 return new ObjCSuperExpr(Loc, T); 436 } 437 } 438 if (D == 0) { 439 // Otherwise, this could be an implicitly declared function reference (legal 440 // in C90, extension in C99). 441 if (HasTrailingLParen && II && 442 !getLangOptions().CPlusPlus) // Not in C++. 443 D = ImplicitlyDefineFunction(Loc, *II, S); 444 else { 445 // If this name wasn't predeclared and if this is not a function call, 446 // diagnose the problem. 447 if (SS && !SS->isEmpty()) 448 return Diag(Loc, diag::err_typecheck_no_member) 449 << Name << SS->getRange(); 450 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 451 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 452 return Diag(Loc, diag::err_undeclared_use) << Name.getAsString(); 453 else 454 return Diag(Loc, diag::err_undeclared_var_use) << Name; 455 } 456 } 457 458 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 459 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 460 if (MD->isStatic()) 461 // "invalid use of member 'x' in static member function" 462 return Diag(Loc, diag::err_invalid_member_use_in_static_method) 463 << FD->getDeclName(); 464 if (MD->getParent() != FD->getDeclContext()) 465 // "invalid use of nonstatic data member 'x'" 466 return Diag(Loc, diag::err_invalid_non_static_member_use) 467 << FD->getDeclName(); 468 469 if (FD->isInvalidDecl()) 470 return true; 471 472 // FIXME: Handle 'mutable'. 473 return new DeclRefExpr(FD, 474 FD->getType().getWithAdditionalQualifiers(MD->getTypeQualifiers()),Loc); 475 } 476 477 return Diag(Loc, diag::err_invalid_non_static_member_use) 478 << FD->getDeclName(); 479 } 480 if (isa<TypedefDecl>(D)) 481 return Diag(Loc, diag::err_unexpected_typedef) << Name; 482 if (isa<ObjCInterfaceDecl>(D)) 483 return Diag(Loc, diag::err_unexpected_interface) << Name; 484 if (isa<NamespaceDecl>(D)) 485 return Diag(Loc, diag::err_unexpected_namespace) << Name; 486 487 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 488 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 489 return new DeclRefExpr(Ovl, Context.OverloadTy, Loc); 490 491 ValueDecl *VD = cast<ValueDecl>(D); 492 493 // check if referencing an identifier with __attribute__((deprecated)). 494 if (VD->getAttr<DeprecatedAttr>()) 495 Diag(Loc, diag::warn_deprecated) << VD->getDeclName(); 496 497 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 498 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 499 Scope *CheckS = S; 500 while (CheckS) { 501 if (CheckS->isWithinElse() && 502 CheckS->getControlParent()->isDeclScope(Var)) { 503 if (Var->getType()->isBooleanType()) 504 Diag(Loc, diag::warn_value_always_false) << Var->getDeclName(); 505 else 506 Diag(Loc, diag::warn_value_always_zero) << Var->getDeclName(); 507 break; 508 } 509 510 // Move up one more control parent to check again. 511 CheckS = CheckS->getControlParent(); 512 if (CheckS) 513 CheckS = CheckS->getParent(); 514 } 515 } 516 } 517 518 // Only create DeclRefExpr's for valid Decl's. 519 if (VD->isInvalidDecl()) 520 return true; 521 522 // If the identifier reference is inside a block, and it refers to a value 523 // that is outside the block, create a BlockDeclRefExpr instead of a 524 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 525 // the block is formed. 526 // 527 // We do not do this for things like enum constants, global variables, etc, 528 // as they do not get snapshotted. 529 // 530 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 531 // The BlocksAttr indicates the variable is bound by-reference. 532 if (VD->getAttr<BlocksAttr>()) 533 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 534 Loc, true); 535 536 // Variable will be bound by-copy, make it const within the closure. 537 VD->getType().addConst(); 538 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 539 Loc, false); 540 } 541 // If this reference is not in a block or if the referenced variable is 542 // within the block, create a normal DeclRefExpr. 543 544 bool TypeDependent = false; 545 bool ValueDependent = false; 546 if (getLangOptions().CPlusPlus) { 547 // C++ [temp.dep.expr]p3: 548 // An id-expression is type-dependent if it contains: 549 // - an identifier that was declared with a dependent type, 550 if (VD->getType()->isDependentType()) 551 TypeDependent = true; 552 // - FIXME: a template-id that is dependent, 553 // - a conversion-function-id that specifies a dependent type, 554 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 555 Name.getCXXNameType()->isDependentType()) 556 TypeDependent = true; 557 // - a nested-name-specifier that contains a class-name that 558 // names a dependent type. 559 else if (SS && !SS->isEmpty()) { 560 for (DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 561 DC; DC = DC->getParent()) { 562 // FIXME: could stop early at namespace scope. 563 if (DC->isCXXRecord()) { 564 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 565 if (Context.getTypeDeclType(Record)->isDependentType()) { 566 TypeDependent = true; 567 break; 568 } 569 } 570 } 571 } 572 573 // C++ [temp.dep.constexpr]p2: 574 // 575 // An identifier is value-dependent if it is: 576 // - a name declared with a dependent type, 577 if (TypeDependent) 578 ValueDependent = true; 579 // - the name of a non-type template parameter, 580 else if (isa<NonTypeTemplateParmDecl>(VD)) 581 ValueDependent = true; 582 // - a constant with integral or enumeration type and is 583 // initialized with an expression that is value-dependent 584 // (FIXME!). 585 } 586 587 return new DeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 588 TypeDependent, ValueDependent); 589} 590 591Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 592 tok::TokenKind Kind) { 593 PredefinedExpr::IdentType IT; 594 595 switch (Kind) { 596 default: assert(0 && "Unknown simple primary expr!"); 597 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 598 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 599 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 600 } 601 602 // Pre-defined identifiers are of type char[x], where x is the length of the 603 // string. 604 unsigned Length; 605 if (FunctionDecl *FD = getCurFunctionDecl()) 606 Length = FD->getIdentifier()->getLength(); 607 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 608 Length = MD->getSynthesizedMethodSize(); 609 else { 610 Diag(Loc, diag::ext_predef_outside_function); 611 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 612 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 613 } 614 615 616 llvm::APInt LengthI(32, Length + 1); 617 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 618 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 619 return new PredefinedExpr(Loc, ResTy, IT); 620} 621 622Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 623 llvm::SmallString<16> CharBuffer; 624 CharBuffer.resize(Tok.getLength()); 625 const char *ThisTokBegin = &CharBuffer[0]; 626 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 627 628 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 629 Tok.getLocation(), PP); 630 if (Literal.hadError()) 631 return ExprResult(true); 632 633 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 634 635 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 636 Tok.getLocation()); 637} 638 639Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 640 // fast path for a single digit (which is quite common). A single digit 641 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 642 if (Tok.getLength() == 1) { 643 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 644 645 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 646 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 647 Context.IntTy, 648 Tok.getLocation())); 649 } 650 llvm::SmallString<512> IntegerBuffer; 651 // Add padding so that NumericLiteralParser can overread by one character. 652 IntegerBuffer.resize(Tok.getLength()+1); 653 const char *ThisTokBegin = &IntegerBuffer[0]; 654 655 // Get the spelling of the token, which eliminates trigraphs, etc. 656 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 657 658 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 659 Tok.getLocation(), PP); 660 if (Literal.hadError) 661 return ExprResult(true); 662 663 Expr *Res; 664 665 if (Literal.isFloatingLiteral()) { 666 QualType Ty; 667 if (Literal.isFloat) 668 Ty = Context.FloatTy; 669 else if (!Literal.isLong) 670 Ty = Context.DoubleTy; 671 else 672 Ty = Context.LongDoubleTy; 673 674 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 675 676 // isExact will be set by GetFloatValue(). 677 bool isExact = false; 678 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 679 Ty, Tok.getLocation()); 680 681 } else if (!Literal.isIntegerLiteral()) { 682 return ExprResult(true); 683 } else { 684 QualType Ty; 685 686 // long long is a C99 feature. 687 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 688 Literal.isLongLong) 689 Diag(Tok.getLocation(), diag::ext_longlong); 690 691 // Get the value in the widest-possible width. 692 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 693 694 if (Literal.GetIntegerValue(ResultVal)) { 695 // If this value didn't fit into uintmax_t, warn and force to ull. 696 Diag(Tok.getLocation(), diag::warn_integer_too_large); 697 Ty = Context.UnsignedLongLongTy; 698 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 699 "long long is not intmax_t?"); 700 } else { 701 // If this value fits into a ULL, try to figure out what else it fits into 702 // according to the rules of C99 6.4.4.1p5. 703 704 // Octal, Hexadecimal, and integers with a U suffix are allowed to 705 // be an unsigned int. 706 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 707 708 // Check from smallest to largest, picking the smallest type we can. 709 unsigned Width = 0; 710 if (!Literal.isLong && !Literal.isLongLong) { 711 // Are int/unsigned possibilities? 712 unsigned IntSize = Context.Target.getIntWidth(); 713 714 // Does it fit in a unsigned int? 715 if (ResultVal.isIntN(IntSize)) { 716 // Does it fit in a signed int? 717 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 718 Ty = Context.IntTy; 719 else if (AllowUnsigned) 720 Ty = Context.UnsignedIntTy; 721 Width = IntSize; 722 } 723 } 724 725 // Are long/unsigned long possibilities? 726 if (Ty.isNull() && !Literal.isLongLong) { 727 unsigned LongSize = Context.Target.getLongWidth(); 728 729 // Does it fit in a unsigned long? 730 if (ResultVal.isIntN(LongSize)) { 731 // Does it fit in a signed long? 732 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 733 Ty = Context.LongTy; 734 else if (AllowUnsigned) 735 Ty = Context.UnsignedLongTy; 736 Width = LongSize; 737 } 738 } 739 740 // Finally, check long long if needed. 741 if (Ty.isNull()) { 742 unsigned LongLongSize = Context.Target.getLongLongWidth(); 743 744 // Does it fit in a unsigned long long? 745 if (ResultVal.isIntN(LongLongSize)) { 746 // Does it fit in a signed long long? 747 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 748 Ty = Context.LongLongTy; 749 else if (AllowUnsigned) 750 Ty = Context.UnsignedLongLongTy; 751 Width = LongLongSize; 752 } 753 } 754 755 // If we still couldn't decide a type, we probably have something that 756 // does not fit in a signed long long, but has no U suffix. 757 if (Ty.isNull()) { 758 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 759 Ty = Context.UnsignedLongLongTy; 760 Width = Context.Target.getLongLongWidth(); 761 } 762 763 if (ResultVal.getBitWidth() != Width) 764 ResultVal.trunc(Width); 765 } 766 767 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 768 } 769 770 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 771 if (Literal.isImaginary) 772 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 773 774 return Res; 775} 776 777Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 778 ExprTy *Val) { 779 Expr *E = (Expr *)Val; 780 assert((E != 0) && "ActOnParenExpr() missing expr"); 781 return new ParenExpr(L, R, E); 782} 783 784/// The UsualUnaryConversions() function is *not* called by this routine. 785/// See C99 6.3.2.1p[2-4] for more details. 786bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 787 SourceLocation OpLoc, 788 const SourceRange &ExprRange, 789 bool isSizeof) { 790 // C99 6.5.3.4p1: 791 if (isa<FunctionType>(exprType) && isSizeof) 792 // alignof(function) is allowed. 793 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 794 else if (exprType->isVoidType()) 795 Diag(OpLoc, diag::ext_sizeof_void_type) 796 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 797 else if (exprType->isIncompleteType()) 798 return Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 799 diag::err_alignof_incomplete_type) 800 << exprType << ExprRange; 801 802 return false; 803} 804 805/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 806/// the same for @c alignof and @c __alignof 807/// Note that the ArgRange is invalid if isType is false. 808Action::ExprResult 809Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 810 void *TyOrEx, const SourceRange &ArgRange) { 811 // If error parsing type, ignore. 812 if (TyOrEx == 0) return true; 813 814 QualType ArgTy; 815 SourceRange Range; 816 if (isType) { 817 ArgTy = QualType::getFromOpaquePtr(TyOrEx); 818 Range = ArgRange; 819 } else { 820 // Get the end location. 821 Expr *ArgEx = (Expr *)TyOrEx; 822 Range = ArgEx->getSourceRange(); 823 ArgTy = ArgEx->getType(); 824 } 825 826 // Verify that the operand is valid. 827 if (CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, isSizeof)) 828 return true; 829 830 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 831 return new SizeOfAlignOfExpr(isSizeof, isType, TyOrEx, Context.getSizeType(), 832 OpLoc, Range.getEnd()); 833} 834 835QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 836 DefaultFunctionArrayConversion(V); 837 838 // These operators return the element type of a complex type. 839 if (const ComplexType *CT = V->getType()->getAsComplexType()) 840 return CT->getElementType(); 841 842 // Otherwise they pass through real integer and floating point types here. 843 if (V->getType()->isArithmeticType()) 844 return V->getType(); 845 846 // Reject anything else. 847 Diag(Loc, diag::err_realimag_invalid_type) << V->getType(); 848 return QualType(); 849} 850 851 852 853Action::ExprResult Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 854 tok::TokenKind Kind, 855 ExprTy *Input) { 856 Expr *Arg = (Expr *)Input; 857 858 UnaryOperator::Opcode Opc; 859 switch (Kind) { 860 default: assert(0 && "Unknown unary op!"); 861 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 862 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 863 } 864 865 if (getLangOptions().CPlusPlus && 866 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 867 // Which overloaded operator? 868 OverloadedOperatorKind OverOp = 869 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 870 871 // C++ [over.inc]p1: 872 // 873 // [...] If the function is a member function with one 874 // parameter (which shall be of type int) or a non-member 875 // function with two parameters (the second of which shall be 876 // of type int), it defines the postfix increment operator ++ 877 // for objects of that type. When the postfix increment is 878 // called as a result of using the ++ operator, the int 879 // argument will have value zero. 880 Expr *Args[2] = { 881 Arg, 882 new IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 883 /*isSigned=*/true), 884 Context.IntTy, SourceLocation()) 885 }; 886 887 // Build the candidate set for overloading 888 OverloadCandidateSet CandidateSet; 889 AddOperatorCandidates(OverOp, S, Args, 2, CandidateSet); 890 891 // Perform overload resolution. 892 OverloadCandidateSet::iterator Best; 893 switch (BestViableFunction(CandidateSet, Best)) { 894 case OR_Success: { 895 // We found a built-in operator or an overloaded operator. 896 FunctionDecl *FnDecl = Best->Function; 897 898 if (FnDecl) { 899 // We matched an overloaded operator. Build a call to that 900 // operator. 901 902 // Convert the arguments. 903 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 904 if (PerformObjectArgumentInitialization(Arg, Method)) 905 return true; 906 } else { 907 // Convert the arguments. 908 if (PerformCopyInitialization(Arg, 909 FnDecl->getParamDecl(0)->getType(), 910 "passing")) 911 return true; 912 } 913 914 // Determine the result type 915 QualType ResultTy 916 = FnDecl->getType()->getAsFunctionType()->getResultType(); 917 ResultTy = ResultTy.getNonReferenceType(); 918 919 // Build the actual expression node. 920 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 921 SourceLocation()); 922 UsualUnaryConversions(FnExpr); 923 924 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, OpLoc); 925 } else { 926 // We matched a built-in operator. Convert the arguments, then 927 // break out so that we will build the appropriate built-in 928 // operator node. 929 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 930 "passing")) 931 return true; 932 933 break; 934 } 935 } 936 937 case OR_No_Viable_Function: 938 // No viable function; fall through to handling this as a 939 // built-in operator, which will produce an error message for us. 940 break; 941 942 case OR_Ambiguous: 943 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 944 << UnaryOperator::getOpcodeStr(Opc) 945 << Arg->getSourceRange(); 946 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 947 return true; 948 } 949 950 // Either we found no viable overloaded operator or we matched a 951 // built-in operator. In either case, fall through to trying to 952 // build a built-in operation. 953 } 954 955 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 956 Opc == UnaryOperator::PostInc); 957 if (result.isNull()) 958 return true; 959 return new UnaryOperator(Arg, Opc, result, OpLoc); 960} 961 962Action::ExprResult Sema:: 963ActOnArraySubscriptExpr(Scope *S, ExprTy *Base, SourceLocation LLoc, 964 ExprTy *Idx, SourceLocation RLoc) { 965 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 966 967 if (getLangOptions().CPlusPlus && 968 (LHSExp->getType()->isRecordType() || 969 LHSExp->getType()->isEnumeralType() || 970 RHSExp->getType()->isRecordType() || 971 RHSExp->getType()->isEnumeralType())) { 972 // Add the appropriate overloaded operators (C++ [over.match.oper]) 973 // to the candidate set. 974 OverloadCandidateSet CandidateSet; 975 Expr *Args[2] = { LHSExp, RHSExp }; 976 AddOperatorCandidates(OO_Subscript, S, Args, 2, CandidateSet); 977 978 // Perform overload resolution. 979 OverloadCandidateSet::iterator Best; 980 switch (BestViableFunction(CandidateSet, Best)) { 981 case OR_Success: { 982 // We found a built-in operator or an overloaded operator. 983 FunctionDecl *FnDecl = Best->Function; 984 985 if (FnDecl) { 986 // We matched an overloaded operator. Build a call to that 987 // operator. 988 989 // Convert the arguments. 990 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 991 if (PerformObjectArgumentInitialization(LHSExp, Method) || 992 PerformCopyInitialization(RHSExp, 993 FnDecl->getParamDecl(0)->getType(), 994 "passing")) 995 return true; 996 } else { 997 // Convert the arguments. 998 if (PerformCopyInitialization(LHSExp, 999 FnDecl->getParamDecl(0)->getType(), 1000 "passing") || 1001 PerformCopyInitialization(RHSExp, 1002 FnDecl->getParamDecl(1)->getType(), 1003 "passing")) 1004 return true; 1005 } 1006 1007 // Determine the result type 1008 QualType ResultTy 1009 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1010 ResultTy = ResultTy.getNonReferenceType(); 1011 1012 // Build the actual expression node. 1013 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 1014 SourceLocation()); 1015 UsualUnaryConversions(FnExpr); 1016 1017 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, LLoc); 1018 } else { 1019 // We matched a built-in operator. Convert the arguments, then 1020 // break out so that we will build the appropriate built-in 1021 // operator node. 1022 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1023 "passing") || 1024 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1025 "passing")) 1026 return true; 1027 1028 break; 1029 } 1030 } 1031 1032 case OR_No_Viable_Function: 1033 // No viable function; fall through to handling this as a 1034 // built-in operator, which will produce an error message for us. 1035 break; 1036 1037 case OR_Ambiguous: 1038 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1039 << "[]" 1040 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1041 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1042 return true; 1043 } 1044 1045 // Either we found no viable overloaded operator or we matched a 1046 // built-in operator. In either case, fall through to trying to 1047 // build a built-in operation. 1048 } 1049 1050 // Perform default conversions. 1051 DefaultFunctionArrayConversion(LHSExp); 1052 DefaultFunctionArrayConversion(RHSExp); 1053 1054 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1055 1056 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1057 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1058 // in the subscript position. As a result, we need to derive the array base 1059 // and index from the expression types. 1060 Expr *BaseExpr, *IndexExpr; 1061 QualType ResultType; 1062 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1063 BaseExpr = LHSExp; 1064 IndexExpr = RHSExp; 1065 // FIXME: need to deal with const... 1066 ResultType = PTy->getPointeeType(); 1067 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1068 // Handle the uncommon case of "123[Ptr]". 1069 BaseExpr = RHSExp; 1070 IndexExpr = LHSExp; 1071 // FIXME: need to deal with const... 1072 ResultType = PTy->getPointeeType(); 1073 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1074 BaseExpr = LHSExp; // vectors: V[123] 1075 IndexExpr = RHSExp; 1076 1077 // Component access limited to variables (reject vec4.rg[1]). 1078 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1079 !isa<ExtVectorElementExpr>(BaseExpr)) 1080 return Diag(LLoc, diag::err_ext_vector_component_access) 1081 << SourceRange(LLoc, RLoc); 1082 // FIXME: need to deal with const... 1083 ResultType = VTy->getElementType(); 1084 } else { 1085 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value) 1086 << RHSExp->getSourceRange(); 1087 } 1088 // C99 6.5.2.1p1 1089 if (!IndexExpr->getType()->isIntegerType()) 1090 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript) 1091 << IndexExpr->getSourceRange(); 1092 1093 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 1094 // the following check catches trying to index a pointer to a function (e.g. 1095 // void (*)(int)) and pointers to incomplete types. Functions are not 1096 // objects in C99. 1097 if (!ResultType->isObjectType()) 1098 return Diag(BaseExpr->getLocStart(), 1099 diag::err_typecheck_subscript_not_object) 1100 << BaseExpr->getType() << BaseExpr->getSourceRange(); 1101 1102 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 1103} 1104 1105QualType Sema:: 1106CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1107 IdentifierInfo &CompName, SourceLocation CompLoc) { 1108 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1109 1110 // This flag determines whether or not the component is to be treated as a 1111 // special name, or a regular GLSL-style component access. 1112 bool SpecialComponent = false; 1113 1114 // The vector accessor can't exceed the number of elements. 1115 const char *compStr = CompName.getName(); 1116 if (strlen(compStr) > vecType->getNumElements()) { 1117 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1118 << baseType << SourceRange(CompLoc); 1119 return QualType(); 1120 } 1121 1122 // Check that we've found one of the special components, or that the component 1123 // names must come from the same set. 1124 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1125 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 1126 SpecialComponent = true; 1127 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1128 do 1129 compStr++; 1130 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1131 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 1132 do 1133 compStr++; 1134 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 1135 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 1136 do 1137 compStr++; 1138 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 1139 } 1140 1141 if (!SpecialComponent && *compStr) { 1142 // We didn't get to the end of the string. This means the component names 1143 // didn't come from the same set *or* we encountered an illegal name. 1144 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1145 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1146 return QualType(); 1147 } 1148 // Each component accessor can't exceed the vector type. 1149 compStr = CompName.getName(); 1150 while (*compStr) { 1151 if (vecType->isAccessorWithinNumElements(*compStr)) 1152 compStr++; 1153 else 1154 break; 1155 } 1156 if (!SpecialComponent && *compStr) { 1157 // We didn't get to the end of the string. This means a component accessor 1158 // exceeds the number of elements in the vector. 1159 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1160 << baseType << SourceRange(CompLoc); 1161 return QualType(); 1162 } 1163 1164 // If we have a special component name, verify that the current vector length 1165 // is an even number, since all special component names return exactly half 1166 // the elements. 1167 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 1168 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1169 << baseType << SourceRange(CompLoc); 1170 return QualType(); 1171 } 1172 1173 // The component accessor looks fine - now we need to compute the actual type. 1174 // The vector type is implied by the component accessor. For example, 1175 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1176 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1177 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 1178 : CompName.getLength(); 1179 if (CompSize == 1) 1180 return vecType->getElementType(); 1181 1182 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1183 // Now look up the TypeDefDecl from the vector type. Without this, 1184 // diagostics look bad. We want extended vector types to appear built-in. 1185 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1186 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1187 return Context.getTypedefType(ExtVectorDecls[i]); 1188 } 1189 return VT; // should never get here (a typedef type should always be found). 1190} 1191 1192/// constructSetterName - Return the setter name for the given 1193/// identifier, i.e. "set" + Name where the initial character of Name 1194/// has been capitalized. 1195// FIXME: Merge with same routine in Parser. But where should this 1196// live? 1197static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 1198 const IdentifierInfo *Name) { 1199 llvm::SmallString<100> SelectorName; 1200 SelectorName = "set"; 1201 SelectorName.append(Name->getName(), Name->getName()+Name->getLength()); 1202 SelectorName[3] = toupper(SelectorName[3]); 1203 return &Idents.get(&SelectorName[0], &SelectorName[SelectorName.size()]); 1204} 1205 1206Action::ExprResult Sema:: 1207ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 1208 tok::TokenKind OpKind, SourceLocation MemberLoc, 1209 IdentifierInfo &Member) { 1210 Expr *BaseExpr = static_cast<Expr *>(Base); 1211 assert(BaseExpr && "no record expression"); 1212 1213 // Perform default conversions. 1214 DefaultFunctionArrayConversion(BaseExpr); 1215 1216 QualType BaseType = BaseExpr->getType(); 1217 assert(!BaseType.isNull() && "no type for member expression"); 1218 1219 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1220 // must have pointer type, and the accessed type is the pointee. 1221 if (OpKind == tok::arrow) { 1222 if (const PointerType *PT = BaseType->getAsPointerType()) 1223 BaseType = PT->getPointeeType(); 1224 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1225 return BuildOverloadedArrowExpr(BaseExpr, OpLoc, MemberLoc, Member); 1226 else 1227 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow) 1228 << BaseType << BaseExpr->getSourceRange(); 1229 } 1230 1231 // Handle field access to simple records. This also handles access to fields 1232 // of the ObjC 'id' struct. 1233 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1234 RecordDecl *RDecl = RTy->getDecl(); 1235 if (RTy->isIncompleteType()) 1236 return Diag(OpLoc, diag::err_typecheck_incomplete_tag) 1237 << RDecl->getDeclName() << BaseExpr->getSourceRange(); 1238 // The record definition is complete, now make sure the member is valid. 1239 // FIXME: Qualified name lookup for C++ is a bit more complicated 1240 // than this. 1241 DeclContext::lookup_result Lookup = RDecl->lookup(Context, &Member); 1242 if (Lookup.first == Lookup.second) { 1243 return Diag(MemberLoc, diag::err_typecheck_no_member) 1244 << &Member << BaseExpr->getSourceRange(); 1245 } 1246 1247 FieldDecl *MemberDecl = dyn_cast<FieldDecl>(*Lookup.first); 1248 if (!MemberDecl) { 1249 unsigned DiagID = PP.getDiagnostics().getCustomDiagID(Diagnostic::Error, 1250 "Clang only supports references to members"); 1251 return Diag(MemberLoc, DiagID); 1252 } 1253 1254 // Figure out the type of the member; see C99 6.5.2.3p3 1255 // FIXME: Handle address space modifiers 1256 QualType MemberType = MemberDecl->getType(); 1257 unsigned combinedQualifiers = 1258 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1259 if (MemberDecl->isMutable()) 1260 combinedQualifiers &= ~QualType::Const; 1261 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1262 1263 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 1264 MemberLoc, MemberType); 1265 } 1266 1267 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1268 // (*Obj).ivar. 1269 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1270 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) { 1271 ObjCIvarRefExpr *MRef= new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, 1272 BaseExpr, 1273 OpKind == tok::arrow); 1274 Context.setFieldDecl(IFTy->getDecl(), IV, MRef); 1275 return MRef; 1276 } 1277 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1278 << IFTy->getDecl()->getDeclName() << &Member 1279 << BaseExpr->getSourceRange(); 1280 } 1281 1282 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1283 // pointer to a (potentially qualified) interface type. 1284 const PointerType *PTy; 1285 const ObjCInterfaceType *IFTy; 1286 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1287 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1288 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1289 1290 // Search for a declared property first. 1291 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 1292 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1293 1294 // Check protocols on qualified interfaces. 1295 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1296 E = IFTy->qual_end(); I != E; ++I) 1297 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1298 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1299 1300 // If that failed, look for an "implicit" property by seeing if the nullary 1301 // selector is implemented. 1302 1303 // FIXME: The logic for looking up nullary and unary selectors should be 1304 // shared with the code in ActOnInstanceMessage. 1305 1306 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1307 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1308 1309 // If this reference is in an @implementation, check for 'private' methods. 1310 if (!Getter) 1311 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1312 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1313 if (ObjCImplementationDecl *ImpDecl = 1314 ObjCImplementations[ClassDecl->getIdentifier()]) 1315 Getter = ImpDecl->getInstanceMethod(Sel); 1316 1317 // Look through local category implementations associated with the class. 1318 if (!Getter) { 1319 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1320 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1321 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1322 } 1323 } 1324 if (Getter) { 1325 // If we found a getter then this may be a valid dot-reference, we 1326 // will look for the matching setter, in case it is needed. 1327 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 1328 &Member); 1329 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 1330 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1331 if (!Setter) { 1332 // If this reference is in an @implementation, also check for 'private' 1333 // methods. 1334 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1335 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1336 if (ObjCImplementationDecl *ImpDecl = 1337 ObjCImplementations[ClassDecl->getIdentifier()]) 1338 Setter = ImpDecl->getInstanceMethod(SetterSel); 1339 } 1340 // Look through local category implementations associated with the class. 1341 if (!Setter) { 1342 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 1343 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1344 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 1345 } 1346 } 1347 1348 // FIXME: we must check that the setter has property type. 1349 return new ObjCKVCRefExpr(Getter, Getter->getResultType(), Setter, 1350 MemberLoc, BaseExpr); 1351 } 1352 1353 return Diag(MemberLoc, diag::err_property_not_found) << 1354 &Member << BaseType; 1355 } 1356 // Handle properties on qualified "id" protocols. 1357 const ObjCQualifiedIdType *QIdTy; 1358 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1359 // Check protocols on qualified interfaces. 1360 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1361 E = QIdTy->qual_end(); I != E; ++I) { 1362 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1363 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1364 // Also must look for a getter name which uses property syntax. 1365 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1366 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1367 return new ObjCMessageExpr(BaseExpr, Sel, OMD->getResultType(), OMD, 1368 OpLoc, MemberLoc, NULL, 0); 1369 } 1370 } 1371 1372 return Diag(MemberLoc, diag::err_property_not_found) << 1373 &Member << BaseType; 1374 } 1375 // Handle 'field access' to vectors, such as 'V.xx'. 1376 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1377 // Component access limited to variables (reject vec4.rg.g). 1378 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1379 !isa<ExtVectorElementExpr>(BaseExpr)) 1380 return Diag(MemberLoc, diag::err_ext_vector_component_access) 1381 << BaseExpr->getSourceRange(); 1382 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1383 if (ret.isNull()) 1384 return true; 1385 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1386 } 1387 1388 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 1389 << BaseType << BaseExpr->getSourceRange(); 1390} 1391 1392/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1393/// This provides the location of the left/right parens and a list of comma 1394/// locations. 1395Action::ExprResult Sema:: 1396ActOnCallExpr(Scope *S, ExprTy *fn, SourceLocation LParenLoc, 1397 ExprTy **args, unsigned NumArgs, 1398 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1399 Expr *Fn = static_cast<Expr *>(fn); 1400 Expr **Args = reinterpret_cast<Expr**>(args); 1401 assert(Fn && "no function call expression"); 1402 FunctionDecl *FDecl = NULL; 1403 OverloadedFunctionDecl *Ovl = NULL; 1404 1405 // Determine whether this is a dependent call inside a C++ template, 1406 // in which case we won't do any semantic analysis now. 1407 bool Dependent = false; 1408 if (Fn->isTypeDependent()) { 1409 if (CXXDependentNameExpr *FnName = dyn_cast<CXXDependentNameExpr>(Fn)) { 1410 if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 1411 Dependent = true; 1412 else { 1413 // Resolve the CXXDependentNameExpr to an actual identifier; 1414 // it wasn't really a dependent name after all. 1415 ExprResult Resolved 1416 = ActOnDeclarationNameExpr(S, FnName->getLocation(), FnName->getName(), 1417 /*HasTrailingLParen=*/true, 1418 /*SS=*/0, 1419 /*ForceResolution=*/true); 1420 if (Resolved.isInvalid) 1421 return true; 1422 else { 1423 delete Fn; 1424 Fn = (Expr *)Resolved.Val; 1425 } 1426 } 1427 } else 1428 Dependent = true; 1429 } else 1430 Dependent = Expr::hasAnyTypeDependentArguments(Args, NumArgs); 1431 1432 // FIXME: Will need to cache the results of name lookup (including 1433 // ADL) in Fn. 1434 if (Dependent) 1435 return new CallExpr(Fn, Args, NumArgs, Context.DependentTy, RParenLoc); 1436 1437 // If we're directly calling a function or a set of overloaded 1438 // functions, get the appropriate declaration. 1439 { 1440 DeclRefExpr *DRExpr = NULL; 1441 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1442 DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()); 1443 else 1444 DRExpr = dyn_cast<DeclRefExpr>(Fn); 1445 1446 if (DRExpr) { 1447 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1448 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1449 } 1450 } 1451 1452 if (Ovl) { 1453 FDecl = ResolveOverloadedCallFn(Fn, Ovl, LParenLoc, Args, NumArgs, CommaLocs, 1454 RParenLoc); 1455 if (!FDecl) 1456 return true; 1457 1458 // Update Fn to refer to the actual function selected. 1459 Expr *NewFn = new DeclRefExpr(FDecl, FDecl->getType(), 1460 Fn->getSourceRange().getBegin()); 1461 Fn->Destroy(Context); 1462 Fn = NewFn; 1463 } 1464 1465 if (getLangOptions().CPlusPlus && Fn->getType()->isRecordType()) 1466 return BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 1467 CommaLocs, RParenLoc); 1468 1469 // Promote the function operand. 1470 UsualUnaryConversions(Fn); 1471 1472 // Make the call expr early, before semantic checks. This guarantees cleanup 1473 // of arguments and function on error. 1474 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1475 Context.BoolTy, RParenLoc)); 1476 1477 const FunctionType *FuncT; 1478 if (!Fn->getType()->isBlockPointerType()) { 1479 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1480 // have type pointer to function". 1481 const PointerType *PT = Fn->getType()->getAsPointerType(); 1482 if (PT == 0) 1483 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1484 << Fn->getType() << Fn->getSourceRange(); 1485 FuncT = PT->getPointeeType()->getAsFunctionType(); 1486 } else { // This is a block call. 1487 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1488 getAsFunctionType(); 1489 } 1490 if (FuncT == 0) 1491 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1492 << Fn->getType() << Fn->getSourceRange(); 1493 1494 // We know the result type of the call, set it. 1495 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 1496 1497 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1498 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1499 // assignment, to the types of the corresponding parameter, ... 1500 unsigned NumArgsInProto = Proto->getNumArgs(); 1501 unsigned NumArgsToCheck = NumArgs; 1502 1503 // If too few arguments are available (and we don't have default 1504 // arguments for the remaining parameters), don't make the call. 1505 if (NumArgs < NumArgsInProto) { 1506 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 1507 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 1508 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 1509 // Use default arguments for missing arguments 1510 NumArgsToCheck = NumArgsInProto; 1511 TheCall->setNumArgs(NumArgsInProto); 1512 } 1513 1514 // If too many are passed and not variadic, error on the extras and drop 1515 // them. 1516 if (NumArgs > NumArgsInProto) { 1517 if (!Proto->isVariadic()) { 1518 Diag(Args[NumArgsInProto]->getLocStart(), 1519 diag::err_typecheck_call_too_many_args) 1520 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 1521 << SourceRange(Args[NumArgsInProto]->getLocStart(), 1522 Args[NumArgs-1]->getLocEnd()); 1523 // This deletes the extra arguments. 1524 TheCall->setNumArgs(NumArgsInProto); 1525 } 1526 NumArgsToCheck = NumArgsInProto; 1527 } 1528 1529 // Continue to check argument types (even if we have too few/many args). 1530 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1531 QualType ProtoArgType = Proto->getArgType(i); 1532 1533 Expr *Arg; 1534 if (i < NumArgs) 1535 Arg = Args[i]; 1536 else 1537 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1538 QualType ArgType = Arg->getType(); 1539 1540 // Pass the argument. 1541 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 1542 return true; 1543 1544 TheCall->setArg(i, Arg); 1545 } 1546 1547 // If this is a variadic call, handle args passed through "...". 1548 if (Proto->isVariadic()) { 1549 // Promote the arguments (C99 6.5.2.2p7). 1550 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1551 Expr *Arg = Args[i]; 1552 DefaultArgumentPromotion(Arg); 1553 TheCall->setArg(i, Arg); 1554 } 1555 } 1556 } else { 1557 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1558 1559 // Promote the arguments (C99 6.5.2.2p6). 1560 for (unsigned i = 0; i != NumArgs; i++) { 1561 Expr *Arg = Args[i]; 1562 DefaultArgumentPromotion(Arg); 1563 TheCall->setArg(i, Arg); 1564 } 1565 } 1566 1567 // Do special checking on direct calls to functions. 1568 if (FDecl) 1569 return CheckFunctionCall(FDecl, TheCall.take()); 1570 1571 return TheCall.take(); 1572} 1573 1574Action::ExprResult Sema:: 1575ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1576 SourceLocation RParenLoc, ExprTy *InitExpr) { 1577 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1578 QualType literalType = QualType::getFromOpaquePtr(Ty); 1579 // FIXME: put back this assert when initializers are worked out. 1580 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1581 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1582 1583 if (literalType->isArrayType()) { 1584 if (literalType->isVariableArrayType()) 1585 return Diag(LParenLoc, diag::err_variable_object_no_init) 1586 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1587 } else if (literalType->isIncompleteType()) { 1588 return Diag(LParenLoc, diag::err_typecheck_decl_incomplete_type) 1589 << literalType 1590 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1591 } 1592 1593 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 1594 DeclarationName())) 1595 return true; 1596 1597 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 1598 if (isFileScope) { // 6.5.2.5p3 1599 if (CheckForConstantInitializer(literalExpr, literalType)) 1600 return true; 1601 } 1602 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, 1603 isFileScope); 1604} 1605 1606Action::ExprResult Sema:: 1607ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1608 InitListDesignations &Designators, 1609 SourceLocation RBraceLoc) { 1610 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1611 1612 // Semantic analysis for initializers is done by ActOnDeclarator() and 1613 // CheckInitializer() - it requires knowledge of the object being intialized. 1614 1615 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc, 1616 Designators.hasAnyDesignators()); 1617 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1618 return E; 1619} 1620 1621/// CheckCastTypes - Check type constraints for casting between types. 1622bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1623 UsualUnaryConversions(castExpr); 1624 1625 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1626 // type needs to be scalar. 1627 if (castType->isVoidType()) { 1628 // Cast to void allows any expr type. 1629 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 1630 // We can't check any more until template instantiation time. 1631 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1632 // GCC struct/union extension: allow cast to self. 1633 if (Context.getCanonicalType(castType) != 1634 Context.getCanonicalType(castExpr->getType()) || 1635 (!castType->isStructureType() && !castType->isUnionType())) { 1636 // Reject any other conversions to non-scalar types. 1637 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 1638 << castType << castExpr->getSourceRange(); 1639 } 1640 1641 // accept this, but emit an ext-warn. 1642 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 1643 << castType << castExpr->getSourceRange(); 1644 } else if (!castExpr->getType()->isScalarType() && 1645 !castExpr->getType()->isVectorType()) { 1646 return Diag(castExpr->getLocStart(), 1647 diag::err_typecheck_expect_scalar_operand) 1648 << castExpr->getType() << castExpr->getSourceRange(); 1649 } else if (castExpr->getType()->isVectorType()) { 1650 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1651 return true; 1652 } else if (castType->isVectorType()) { 1653 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1654 return true; 1655 } 1656 return false; 1657} 1658 1659bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1660 assert(VectorTy->isVectorType() && "Not a vector type!"); 1661 1662 if (Ty->isVectorType() || Ty->isIntegerType()) { 1663 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1664 return Diag(R.getBegin(), 1665 Ty->isVectorType() ? 1666 diag::err_invalid_conversion_between_vectors : 1667 diag::err_invalid_conversion_between_vector_and_integer) 1668 << VectorTy << Ty << R; 1669 } else 1670 return Diag(R.getBegin(), 1671 diag::err_invalid_conversion_between_vector_and_scalar) 1672 << VectorTy << Ty << R; 1673 1674 return false; 1675} 1676 1677Action::ExprResult Sema:: 1678ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1679 SourceLocation RParenLoc, ExprTy *Op) { 1680 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1681 1682 Expr *castExpr = static_cast<Expr*>(Op); 1683 QualType castType = QualType::getFromOpaquePtr(Ty); 1684 1685 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1686 return true; 1687 return new CStyleCastExpr(castType, castExpr, castType, LParenLoc, RParenLoc); 1688} 1689 1690/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1691/// In that case, lex = cond. 1692inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1693 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1694 UsualUnaryConversions(cond); 1695 UsualUnaryConversions(lex); 1696 UsualUnaryConversions(rex); 1697 QualType condT = cond->getType(); 1698 QualType lexT = lex->getType(); 1699 QualType rexT = rex->getType(); 1700 1701 // first, check the condition. 1702 if (!cond->isTypeDependent()) { 1703 if (!condT->isScalarType()) { // C99 6.5.15p2 1704 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) << condT; 1705 return QualType(); 1706 } 1707 } 1708 1709 // Now check the two expressions. 1710 if ((lex && lex->isTypeDependent()) || (rex && rex->isTypeDependent())) 1711 return Context.DependentTy; 1712 1713 // If both operands have arithmetic type, do the usual arithmetic conversions 1714 // to find a common type: C99 6.5.15p3,5. 1715 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1716 UsualArithmeticConversions(lex, rex); 1717 return lex->getType(); 1718 } 1719 1720 // If both operands are the same structure or union type, the result is that 1721 // type. 1722 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1723 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1724 if (LHSRT->getDecl() == RHSRT->getDecl()) 1725 // "If both the operands have structure or union type, the result has 1726 // that type." This implies that CV qualifiers are dropped. 1727 return lexT.getUnqualifiedType(); 1728 } 1729 1730 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1731 // The following || allows only one side to be void (a GCC-ism). 1732 if (lexT->isVoidType() || rexT->isVoidType()) { 1733 if (!lexT->isVoidType()) 1734 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void) 1735 << rex->getSourceRange(); 1736 if (!rexT->isVoidType()) 1737 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void) 1738 << lex->getSourceRange(); 1739 ImpCastExprToType(lex, Context.VoidTy); 1740 ImpCastExprToType(rex, Context.VoidTy); 1741 return Context.VoidTy; 1742 } 1743 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1744 // the type of the other operand." 1745 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1746 Context.isObjCObjectPointerType(lexT)) && 1747 rex->isNullPointerConstant(Context)) { 1748 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1749 return lexT; 1750 } 1751 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1752 Context.isObjCObjectPointerType(rexT)) && 1753 lex->isNullPointerConstant(Context)) { 1754 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1755 return rexT; 1756 } 1757 // Handle the case where both operands are pointers before we handle null 1758 // pointer constants in case both operands are null pointer constants. 1759 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1760 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1761 // get the "pointed to" types 1762 QualType lhptee = LHSPT->getPointeeType(); 1763 QualType rhptee = RHSPT->getPointeeType(); 1764 1765 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1766 if (lhptee->isVoidType() && 1767 rhptee->isIncompleteOrObjectType()) { 1768 // Figure out necessary qualifiers (C99 6.5.15p6) 1769 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1770 QualType destType = Context.getPointerType(destPointee); 1771 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1772 ImpCastExprToType(rex, destType); // promote to void* 1773 return destType; 1774 } 1775 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1776 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1777 QualType destType = Context.getPointerType(destPointee); 1778 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1779 ImpCastExprToType(rex, destType); // promote to void* 1780 return destType; 1781 } 1782 1783 QualType compositeType = lexT; 1784 1785 // If either type is an Objective-C object type then check 1786 // compatibility according to Objective-C. 1787 if (Context.isObjCObjectPointerType(lexT) || 1788 Context.isObjCObjectPointerType(rexT)) { 1789 // If both operands are interfaces and either operand can be 1790 // assigned to the other, use that type as the composite 1791 // type. This allows 1792 // xxx ? (A*) a : (B*) b 1793 // where B is a subclass of A. 1794 // 1795 // Additionally, as for assignment, if either type is 'id' 1796 // allow silent coercion. Finally, if the types are 1797 // incompatible then make sure to use 'id' as the composite 1798 // type so the result is acceptable for sending messages to. 1799 1800 // FIXME: This code should not be localized to here. Also this 1801 // should use a compatible check instead of abusing the 1802 // canAssignObjCInterfaces code. 1803 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1804 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1805 if (LHSIface && RHSIface && 1806 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1807 compositeType = lexT; 1808 } else if (LHSIface && RHSIface && 1809 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 1810 compositeType = rexT; 1811 } else if (Context.isObjCIdType(lhptee) || 1812 Context.isObjCIdType(rhptee)) { 1813 // FIXME: This code looks wrong, because isObjCIdType checks 1814 // the struct but getObjCIdType returns the pointer to 1815 // struct. This is horrible and should be fixed. 1816 compositeType = Context.getObjCIdType(); 1817 } else { 1818 QualType incompatTy = Context.getObjCIdType(); 1819 ImpCastExprToType(lex, incompatTy); 1820 ImpCastExprToType(rex, incompatTy); 1821 return incompatTy; 1822 } 1823 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1824 rhptee.getUnqualifiedType())) { 1825 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers) 1826 << lexT << rexT << lex->getSourceRange() << rex->getSourceRange(); 1827 // In this situation, we assume void* type. No especially good 1828 // reason, but this is what gcc does, and we do have to pick 1829 // to get a consistent AST. 1830 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1831 ImpCastExprToType(lex, incompatTy); 1832 ImpCastExprToType(rex, incompatTy); 1833 return incompatTy; 1834 } 1835 // The pointer types are compatible. 1836 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1837 // differently qualified versions of compatible types, the result type is 1838 // a pointer to an appropriately qualified version of the *composite* 1839 // type. 1840 // FIXME: Need to calculate the composite type. 1841 // FIXME: Need to add qualifiers 1842 ImpCastExprToType(lex, compositeType); 1843 ImpCastExprToType(rex, compositeType); 1844 return compositeType; 1845 } 1846 } 1847 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1848 // evaluates to "struct objc_object *" (and is handled above when comparing 1849 // id with statically typed objects). 1850 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1851 // GCC allows qualified id and any Objective-C type to devolve to 1852 // id. Currently localizing to here until clear this should be 1853 // part of ObjCQualifiedIdTypesAreCompatible. 1854 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1855 (lexT->isObjCQualifiedIdType() && 1856 Context.isObjCObjectPointerType(rexT)) || 1857 (rexT->isObjCQualifiedIdType() && 1858 Context.isObjCObjectPointerType(lexT))) { 1859 // FIXME: This is not the correct composite type. This only 1860 // happens to work because id can more or less be used anywhere, 1861 // however this may change the type of method sends. 1862 // FIXME: gcc adds some type-checking of the arguments and emits 1863 // (confusing) incompatible comparison warnings in some 1864 // cases. Investigate. 1865 QualType compositeType = Context.getObjCIdType(); 1866 ImpCastExprToType(lex, compositeType); 1867 ImpCastExprToType(rex, compositeType); 1868 return compositeType; 1869 } 1870 } 1871 1872 // Selection between block pointer types is ok as long as they are the same. 1873 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1874 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1875 return lexT; 1876 1877 // Otherwise, the operands are not compatible. 1878 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands) 1879 << lexT << rexT << lex->getSourceRange() << rex->getSourceRange(); 1880 return QualType(); 1881} 1882 1883/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1884/// in the case of a the GNU conditional expr extension. 1885Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1886 SourceLocation ColonLoc, 1887 ExprTy *Cond, ExprTy *LHS, 1888 ExprTy *RHS) { 1889 Expr *CondExpr = (Expr *) Cond; 1890 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1891 1892 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1893 // was the condition. 1894 bool isLHSNull = LHSExpr == 0; 1895 if (isLHSNull) 1896 LHSExpr = CondExpr; 1897 1898 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1899 RHSExpr, QuestionLoc); 1900 if (result.isNull()) 1901 return true; 1902 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1903 RHSExpr, result); 1904} 1905 1906 1907// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1908// being closely modeled after the C99 spec:-). The odd characteristic of this 1909// routine is it effectively iqnores the qualifiers on the top level pointee. 1910// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1911// FIXME: add a couple examples in this comment. 1912Sema::AssignConvertType 1913Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1914 QualType lhptee, rhptee; 1915 1916 // get the "pointed to" type (ignoring qualifiers at the top level) 1917 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1918 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1919 1920 // make sure we operate on the canonical type 1921 lhptee = Context.getCanonicalType(lhptee); 1922 rhptee = Context.getCanonicalType(rhptee); 1923 1924 AssignConvertType ConvTy = Compatible; 1925 1926 // C99 6.5.16.1p1: This following citation is common to constraints 1927 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1928 // qualifiers of the type *pointed to* by the right; 1929 // FIXME: Handle ASQualType 1930 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 1931 ConvTy = CompatiblePointerDiscardsQualifiers; 1932 1933 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1934 // incomplete type and the other is a pointer to a qualified or unqualified 1935 // version of void... 1936 if (lhptee->isVoidType()) { 1937 if (rhptee->isIncompleteOrObjectType()) 1938 return ConvTy; 1939 1940 // As an extension, we allow cast to/from void* to function pointer. 1941 assert(rhptee->isFunctionType()); 1942 return FunctionVoidPointer; 1943 } 1944 1945 if (rhptee->isVoidType()) { 1946 if (lhptee->isIncompleteOrObjectType()) 1947 return ConvTy; 1948 1949 // As an extension, we allow cast to/from void* to function pointer. 1950 assert(lhptee->isFunctionType()); 1951 return FunctionVoidPointer; 1952 } 1953 1954 // Check for ObjC interfaces 1955 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1956 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1957 if (LHSIface && RHSIface && 1958 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1959 return ConvTy; 1960 1961 // ID acts sort of like void* for ObjC interfaces 1962 if (LHSIface && Context.isObjCIdType(rhptee)) 1963 return ConvTy; 1964 if (RHSIface && Context.isObjCIdType(lhptee)) 1965 return ConvTy; 1966 1967 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1968 // unqualified versions of compatible types, ... 1969 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1970 rhptee.getUnqualifiedType())) 1971 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1972 return ConvTy; 1973} 1974 1975/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1976/// block pointer types are compatible or whether a block and normal pointer 1977/// are compatible. It is more restrict than comparing two function pointer 1978// types. 1979Sema::AssignConvertType 1980Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1981 QualType rhsType) { 1982 QualType lhptee, rhptee; 1983 1984 // get the "pointed to" type (ignoring qualifiers at the top level) 1985 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1986 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1987 1988 // make sure we operate on the canonical type 1989 lhptee = Context.getCanonicalType(lhptee); 1990 rhptee = Context.getCanonicalType(rhptee); 1991 1992 AssignConvertType ConvTy = Compatible; 1993 1994 // For blocks we enforce that qualifiers are identical. 1995 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1996 ConvTy = CompatiblePointerDiscardsQualifiers; 1997 1998 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1999 return IncompatibleBlockPointer; 2000 return ConvTy; 2001} 2002 2003/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2004/// has code to accommodate several GCC extensions when type checking 2005/// pointers. Here are some objectionable examples that GCC considers warnings: 2006/// 2007/// int a, *pint; 2008/// short *pshort; 2009/// struct foo *pfoo; 2010/// 2011/// pint = pshort; // warning: assignment from incompatible pointer type 2012/// a = pint; // warning: assignment makes integer from pointer without a cast 2013/// pint = a; // warning: assignment makes pointer from integer without a cast 2014/// pint = pfoo; // warning: assignment from incompatible pointer type 2015/// 2016/// As a result, the code for dealing with pointers is more complex than the 2017/// C99 spec dictates. 2018/// 2019Sema::AssignConvertType 2020Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2021 // Get canonical types. We're not formatting these types, just comparing 2022 // them. 2023 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2024 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2025 2026 if (lhsType == rhsType) 2027 return Compatible; // Common case: fast path an exact match. 2028 2029 // If the left-hand side is a reference type, then we are in a 2030 // (rare!) case where we've allowed the use of references in C, 2031 // e.g., as a parameter type in a built-in function. In this case, 2032 // just make sure that the type referenced is compatible with the 2033 // right-hand side type. The caller is responsible for adjusting 2034 // lhsType so that the resulting expression does not have reference 2035 // type. 2036 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2037 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2038 return Compatible; 2039 return Incompatible; 2040 } 2041 2042 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 2043 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 2044 return Compatible; 2045 // Relax integer conversions like we do for pointers below. 2046 if (rhsType->isIntegerType()) 2047 return IntToPointer; 2048 if (lhsType->isIntegerType()) 2049 return PointerToInt; 2050 return IncompatibleObjCQualifiedId; 2051 } 2052 2053 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2054 // For ExtVector, allow vector splats; float -> <n x float> 2055 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2056 if (LV->getElementType() == rhsType) 2057 return Compatible; 2058 2059 // If we are allowing lax vector conversions, and LHS and RHS are both 2060 // vectors, the total size only needs to be the same. This is a bitcast; 2061 // no bits are changed but the result type is different. 2062 if (getLangOptions().LaxVectorConversions && 2063 lhsType->isVectorType() && rhsType->isVectorType()) { 2064 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2065 return Compatible; 2066 } 2067 return Incompatible; 2068 } 2069 2070 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2071 return Compatible; 2072 2073 if (isa<PointerType>(lhsType)) { 2074 if (rhsType->isIntegerType()) 2075 return IntToPointer; 2076 2077 if (isa<PointerType>(rhsType)) 2078 return CheckPointerTypesForAssignment(lhsType, rhsType); 2079 2080 if (rhsType->getAsBlockPointerType()) { 2081 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2082 return Compatible; 2083 2084 // Treat block pointers as objects. 2085 if (getLangOptions().ObjC1 && 2086 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2087 return Compatible; 2088 } 2089 return Incompatible; 2090 } 2091 2092 if (isa<BlockPointerType>(lhsType)) { 2093 if (rhsType->isIntegerType()) 2094 return IntToPointer; 2095 2096 // Treat block pointers as objects. 2097 if (getLangOptions().ObjC1 && 2098 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2099 return Compatible; 2100 2101 if (rhsType->isBlockPointerType()) 2102 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2103 2104 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2105 if (RHSPT->getPointeeType()->isVoidType()) 2106 return Compatible; 2107 } 2108 return Incompatible; 2109 } 2110 2111 if (isa<PointerType>(rhsType)) { 2112 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2113 if (lhsType == Context.BoolTy) 2114 return Compatible; 2115 2116 if (lhsType->isIntegerType()) 2117 return PointerToInt; 2118 2119 if (isa<PointerType>(lhsType)) 2120 return CheckPointerTypesForAssignment(lhsType, rhsType); 2121 2122 if (isa<BlockPointerType>(lhsType) && 2123 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2124 return Compatible; 2125 return Incompatible; 2126 } 2127 2128 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 2129 if (Context.typesAreCompatible(lhsType, rhsType)) 2130 return Compatible; 2131 } 2132 return Incompatible; 2133} 2134 2135Sema::AssignConvertType 2136Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2137 if (getLangOptions().CPlusPlus) { 2138 if (!lhsType->isRecordType()) { 2139 // C++ 5.17p3: If the left operand is not of class type, the 2140 // expression is implicitly converted (C++ 4) to the 2141 // cv-unqualified type of the left operand. 2142 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 2143 "assigning")) 2144 return Incompatible; 2145 else 2146 return Compatible; 2147 } 2148 2149 // FIXME: Currently, we fall through and treat C++ classes like C 2150 // structures. 2151 } 2152 2153 // C99 6.5.16.1p1: the left operand is a pointer and the right is 2154 // a null pointer constant. 2155 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 2156 lhsType->isBlockPointerType()) 2157 && rExpr->isNullPointerConstant(Context)) { 2158 ImpCastExprToType(rExpr, lhsType); 2159 return Compatible; 2160 } 2161 2162 // We don't allow conversion of non-null-pointer constants to integers. 2163 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 2164 return IntToBlockPointer; 2165 2166 // This check seems unnatural, however it is necessary to ensure the proper 2167 // conversion of functions/arrays. If the conversion were done for all 2168 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 2169 // expressions that surpress this implicit conversion (&, sizeof). 2170 // 2171 // Suppress this for references: C++ 8.5.3p5. 2172 if (!lhsType->isReferenceType()) 2173 DefaultFunctionArrayConversion(rExpr); 2174 2175 Sema::AssignConvertType result = 2176 CheckAssignmentConstraints(lhsType, rExpr->getType()); 2177 2178 // C99 6.5.16.1p2: The value of the right operand is converted to the 2179 // type of the assignment expression. 2180 // CheckAssignmentConstraints allows the left-hand side to be a reference, 2181 // so that we can use references in built-in functions even in C. 2182 // The getNonReferenceType() call makes sure that the resulting expression 2183 // does not have reference type. 2184 if (rExpr->getType() != lhsType) 2185 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 2186 return result; 2187} 2188 2189Sema::AssignConvertType 2190Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 2191 return CheckAssignmentConstraints(lhsType, rhsType); 2192} 2193 2194QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 2195 Diag(Loc, diag::err_typecheck_invalid_operands) 2196 << lex->getType() << rex->getType() 2197 << lex->getSourceRange() << rex->getSourceRange(); 2198 return QualType(); 2199} 2200 2201inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 2202 Expr *&rex) { 2203 // For conversion purposes, we ignore any qualifiers. 2204 // For example, "const float" and "float" are equivalent. 2205 QualType lhsType = 2206 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 2207 QualType rhsType = 2208 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 2209 2210 // If the vector types are identical, return. 2211 if (lhsType == rhsType) 2212 return lhsType; 2213 2214 // Handle the case of a vector & extvector type of the same size and element 2215 // type. It would be nice if we only had one vector type someday. 2216 if (getLangOptions().LaxVectorConversions) 2217 if (const VectorType *LV = lhsType->getAsVectorType()) 2218 if (const VectorType *RV = rhsType->getAsVectorType()) 2219 if (LV->getElementType() == RV->getElementType() && 2220 LV->getNumElements() == RV->getNumElements()) 2221 return lhsType->isExtVectorType() ? lhsType : rhsType; 2222 2223 // If the lhs is an extended vector and the rhs is a scalar of the same type 2224 // or a literal, promote the rhs to the vector type. 2225 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 2226 QualType eltType = V->getElementType(); 2227 2228 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 2229 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 2230 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 2231 ImpCastExprToType(rex, lhsType); 2232 return lhsType; 2233 } 2234 } 2235 2236 // If the rhs is an extended vector and the lhs is a scalar of the same type, 2237 // promote the lhs to the vector type. 2238 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 2239 QualType eltType = V->getElementType(); 2240 2241 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 2242 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 2243 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 2244 ImpCastExprToType(lex, rhsType); 2245 return rhsType; 2246 } 2247 } 2248 2249 // You cannot convert between vector values of different size. 2250 Diag(Loc, diag::err_typecheck_vector_not_convertable) 2251 << lex->getType() << rex->getType() 2252 << lex->getSourceRange() << rex->getSourceRange(); 2253 return QualType(); 2254} 2255 2256inline QualType Sema::CheckMultiplyDivideOperands( 2257 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2258{ 2259 QualType lhsType = lex->getType(), rhsType = rex->getType(); 2260 2261 if (lhsType->isVectorType() || rhsType->isVectorType()) 2262 return CheckVectorOperands(Loc, lex, rex); 2263 2264 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2265 2266 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2267 return compType; 2268 return InvalidOperands(Loc, lex, rex); 2269} 2270 2271inline QualType Sema::CheckRemainderOperands( 2272 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2273{ 2274 QualType lhsType = lex->getType(), rhsType = rex->getType(); 2275 2276 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2277 2278 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2279 return compType; 2280 return InvalidOperands(Loc, lex, rex); 2281} 2282 2283inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 2284 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2285{ 2286 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2287 return CheckVectorOperands(Loc, lex, rex); 2288 2289 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2290 2291 // handle the common case first (both operands are arithmetic). 2292 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2293 return compType; 2294 2295 // Put any potential pointer into PExp 2296 Expr* PExp = lex, *IExp = rex; 2297 if (IExp->getType()->isPointerType()) 2298 std::swap(PExp, IExp); 2299 2300 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 2301 if (IExp->getType()->isIntegerType()) { 2302 // Check for arithmetic on pointers to incomplete types 2303 if (!PTy->getPointeeType()->isObjectType()) { 2304 if (PTy->getPointeeType()->isVoidType()) { 2305 Diag(Loc, diag::ext_gnu_void_ptr) 2306 << lex->getSourceRange() << rex->getSourceRange(); 2307 } else { 2308 Diag(Loc, diag::err_typecheck_arithmetic_incomplete_type) 2309 << lex->getType() << lex->getSourceRange(); 2310 return QualType(); 2311 } 2312 } 2313 return PExp->getType(); 2314 } 2315 } 2316 2317 return InvalidOperands(Loc, lex, rex); 2318} 2319 2320// C99 6.5.6 2321QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 2322 SourceLocation Loc, bool isCompAssign) { 2323 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2324 return CheckVectorOperands(Loc, lex, rex); 2325 2326 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2327 2328 // Enforce type constraints: C99 6.5.6p3. 2329 2330 // Handle the common case first (both operands are arithmetic). 2331 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2332 return compType; 2333 2334 // Either ptr - int or ptr - ptr. 2335 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 2336 QualType lpointee = LHSPTy->getPointeeType(); 2337 2338 // The LHS must be an object type, not incomplete, function, etc. 2339 if (!lpointee->isObjectType()) { 2340 // Handle the GNU void* extension. 2341 if (lpointee->isVoidType()) { 2342 Diag(Loc, diag::ext_gnu_void_ptr) 2343 << lex->getSourceRange() << rex->getSourceRange(); 2344 } else { 2345 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2346 << lex->getType() << lex->getSourceRange(); 2347 return QualType(); 2348 } 2349 } 2350 2351 // The result type of a pointer-int computation is the pointer type. 2352 if (rex->getType()->isIntegerType()) 2353 return lex->getType(); 2354 2355 // Handle pointer-pointer subtractions. 2356 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 2357 QualType rpointee = RHSPTy->getPointeeType(); 2358 2359 // RHS must be an object type, unless void (GNU). 2360 if (!rpointee->isObjectType()) { 2361 // Handle the GNU void* extension. 2362 if (rpointee->isVoidType()) { 2363 if (!lpointee->isVoidType()) 2364 Diag(Loc, diag::ext_gnu_void_ptr) 2365 << lex->getSourceRange() << rex->getSourceRange(); 2366 } else { 2367 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2368 << rex->getType() << rex->getSourceRange(); 2369 return QualType(); 2370 } 2371 } 2372 2373 // Pointee types must be compatible. 2374 if (!Context.typesAreCompatible( 2375 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2376 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2377 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 2378 << lex->getType() << rex->getType() 2379 << lex->getSourceRange() << rex->getSourceRange(); 2380 return QualType(); 2381 } 2382 2383 return Context.getPointerDiffType(); 2384 } 2385 } 2386 2387 return InvalidOperands(Loc, lex, rex); 2388} 2389 2390// C99 6.5.7 2391QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2392 bool isCompAssign) { 2393 // C99 6.5.7p2: Each of the operands shall have integer type. 2394 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2395 return InvalidOperands(Loc, lex, rex); 2396 2397 // Shifts don't perform usual arithmetic conversions, they just do integer 2398 // promotions on each operand. C99 6.5.7p3 2399 if (!isCompAssign) 2400 UsualUnaryConversions(lex); 2401 UsualUnaryConversions(rex); 2402 2403 // "The type of the result is that of the promoted left operand." 2404 return lex->getType(); 2405} 2406 2407static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 2408 ASTContext& Context) { 2409 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2410 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2411 // ID acts sort of like void* for ObjC interfaces 2412 if (LHSIface && Context.isObjCIdType(RHS)) 2413 return true; 2414 if (RHSIface && Context.isObjCIdType(LHS)) 2415 return true; 2416 if (!LHSIface || !RHSIface) 2417 return false; 2418 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 2419 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 2420} 2421 2422// C99 6.5.8 2423QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2424 bool isRelational) { 2425 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2426 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 2427 2428 // C99 6.5.8p3 / C99 6.5.9p4 2429 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2430 UsualArithmeticConversions(lex, rex); 2431 else { 2432 UsualUnaryConversions(lex); 2433 UsualUnaryConversions(rex); 2434 } 2435 QualType lType = lex->getType(); 2436 QualType rType = rex->getType(); 2437 2438 // For non-floating point types, check for self-comparisons of the form 2439 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2440 // often indicate logic errors in the program. 2441 if (!lType->isFloatingType()) { 2442 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2443 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2444 if (DRL->getDecl() == DRR->getDecl()) 2445 Diag(Loc, diag::warn_selfcomparison); 2446 } 2447 2448 // The result of comparisons is 'bool' in C++, 'int' in C. 2449 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy : Context.IntTy; 2450 2451 if (isRelational) { 2452 if (lType->isRealType() && rType->isRealType()) 2453 return ResultTy; 2454 } else { 2455 // Check for comparisons of floating point operands using != and ==. 2456 if (lType->isFloatingType()) { 2457 assert (rType->isFloatingType()); 2458 CheckFloatComparison(Loc,lex,rex); 2459 } 2460 2461 if (lType->isArithmeticType() && rType->isArithmeticType()) 2462 return ResultTy; 2463 } 2464 2465 bool LHSIsNull = lex->isNullPointerConstant(Context); 2466 bool RHSIsNull = rex->isNullPointerConstant(Context); 2467 2468 // All of the following pointer related warnings are GCC extensions, except 2469 // when handling null pointer constants. One day, we can consider making them 2470 // errors (when -pedantic-errors is enabled). 2471 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2472 QualType LCanPointeeTy = 2473 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2474 QualType RCanPointeeTy = 2475 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2476 2477 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2478 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2479 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2480 RCanPointeeTy.getUnqualifiedType()) && 2481 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2482 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2483 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2484 } 2485 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2486 return ResultTy; 2487 } 2488 // Handle block pointer types. 2489 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2490 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2491 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2492 2493 if (!LHSIsNull && !RHSIsNull && 2494 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2495 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2496 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2497 } 2498 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2499 return ResultTy; 2500 } 2501 // Allow block pointers to be compared with null pointer constants. 2502 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2503 (lType->isPointerType() && rType->isBlockPointerType())) { 2504 if (!LHSIsNull && !RHSIsNull) { 2505 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2506 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2507 } 2508 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2509 return ResultTy; 2510 } 2511 2512 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2513 if (lType->isPointerType() || rType->isPointerType()) { 2514 const PointerType *LPT = lType->getAsPointerType(); 2515 const PointerType *RPT = rType->getAsPointerType(); 2516 bool LPtrToVoid = LPT ? 2517 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 2518 bool RPtrToVoid = RPT ? 2519 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 2520 2521 if (!LPtrToVoid && !RPtrToVoid && 2522 !Context.typesAreCompatible(lType, rType)) { 2523 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2524 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2525 ImpCastExprToType(rex, lType); 2526 return ResultTy; 2527 } 2528 ImpCastExprToType(rex, lType); 2529 return ResultTy; 2530 } 2531 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2532 ImpCastExprToType(rex, lType); 2533 return ResultTy; 2534 } else { 2535 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2536 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 2537 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2538 ImpCastExprToType(rex, lType); 2539 return ResultTy; 2540 } 2541 } 2542 } 2543 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2544 rType->isIntegerType()) { 2545 if (!RHSIsNull) 2546 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2547 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2548 ImpCastExprToType(rex, lType); // promote the integer to pointer 2549 return ResultTy; 2550 } 2551 if (lType->isIntegerType() && 2552 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2553 if (!LHSIsNull) 2554 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2555 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2556 ImpCastExprToType(lex, rType); // promote the integer to pointer 2557 return ResultTy; 2558 } 2559 // Handle block pointers. 2560 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2561 if (!RHSIsNull) 2562 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2563 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2564 ImpCastExprToType(rex, lType); // promote the integer to pointer 2565 return ResultTy; 2566 } 2567 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2568 if (!LHSIsNull) 2569 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2570 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2571 ImpCastExprToType(lex, rType); // promote the integer to pointer 2572 return ResultTy; 2573 } 2574 return InvalidOperands(Loc, lex, rex); 2575} 2576 2577/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2578/// operates on extended vector types. Instead of producing an IntTy result, 2579/// like a scalar comparison, a vector comparison produces a vector of integer 2580/// types. 2581QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2582 SourceLocation Loc, 2583 bool isRelational) { 2584 // Check to make sure we're operating on vectors of the same type and width, 2585 // Allowing one side to be a scalar of element type. 2586 QualType vType = CheckVectorOperands(Loc, lex, rex); 2587 if (vType.isNull()) 2588 return vType; 2589 2590 QualType lType = lex->getType(); 2591 QualType rType = rex->getType(); 2592 2593 // For non-floating point types, check for self-comparisons of the form 2594 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2595 // often indicate logic errors in the program. 2596 if (!lType->isFloatingType()) { 2597 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2598 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2599 if (DRL->getDecl() == DRR->getDecl()) 2600 Diag(Loc, diag::warn_selfcomparison); 2601 } 2602 2603 // Check for comparisons of floating point operands using != and ==. 2604 if (!isRelational && lType->isFloatingType()) { 2605 assert (rType->isFloatingType()); 2606 CheckFloatComparison(Loc,lex,rex); 2607 } 2608 2609 // Return the type for the comparison, which is the same as vector type for 2610 // integer vectors, or an integer type of identical size and number of 2611 // elements for floating point vectors. 2612 if (lType->isIntegerType()) 2613 return lType; 2614 2615 const VectorType *VTy = lType->getAsVectorType(); 2616 2617 // FIXME: need to deal with non-32b int / non-64b long long 2618 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2619 if (TypeSize == 32) { 2620 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2621 } 2622 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2623 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2624} 2625 2626inline QualType Sema::CheckBitwiseOperands( 2627 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2628{ 2629 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2630 return CheckVectorOperands(Loc, lex, rex); 2631 2632 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2633 2634 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2635 return compType; 2636 return InvalidOperands(Loc, lex, rex); 2637} 2638 2639inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2640 Expr *&lex, Expr *&rex, SourceLocation Loc) 2641{ 2642 UsualUnaryConversions(lex); 2643 UsualUnaryConversions(rex); 2644 2645 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2646 return Context.IntTy; 2647 return InvalidOperands(Loc, lex, rex); 2648} 2649 2650/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 2651/// emit an error and return true. If so, return false. 2652static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 2653 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 2654 if (IsLV == Expr::MLV_Valid) 2655 return false; 2656 2657 unsigned Diag = 0; 2658 bool NeedType = false; 2659 switch (IsLV) { // C99 6.5.16p2 2660 default: assert(0 && "Unknown result from isModifiableLvalue!"); 2661 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 2662 case Expr::MLV_ArrayType: 2663 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 2664 NeedType = true; 2665 break; 2666 case Expr::MLV_NotObjectType: 2667 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 2668 NeedType = true; 2669 break; 2670 case Expr::MLV_LValueCast: 2671 Diag = diag::err_typecheck_lvalue_casts_not_supported; 2672 break; 2673 case Expr::MLV_InvalidExpression: 2674 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 2675 break; 2676 case Expr::MLV_IncompleteType: 2677 case Expr::MLV_IncompleteVoidType: 2678 Diag = diag::err_typecheck_incomplete_type_not_modifiable_lvalue; 2679 NeedType = true; 2680 break; 2681 case Expr::MLV_DuplicateVectorComponents: 2682 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 2683 break; 2684 case Expr::MLV_NotBlockQualified: 2685 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 2686 break; 2687 case Expr::MLV_ReadonlyProperty: 2688 Diag = diag::error_readonly_property_assignment; 2689 break; 2690 case Expr::MLV_NoSetterProperty: 2691 Diag = diag::error_nosetter_property_assignment; 2692 break; 2693 } 2694 2695 if (NeedType) 2696 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 2697 else 2698 S.Diag(Loc, Diag) << E->getSourceRange(); 2699 return true; 2700} 2701 2702 2703 2704// C99 6.5.16.1 2705QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 2706 SourceLocation Loc, 2707 QualType CompoundType) { 2708 // Verify that LHS is a modifiable lvalue, and emit error if not. 2709 if (CheckForModifiableLvalue(LHS, Loc, *this)) 2710 return QualType(); 2711 2712 QualType LHSType = LHS->getType(); 2713 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 2714 2715 AssignConvertType ConvTy; 2716 if (CompoundType.isNull()) { 2717 // Simple assignment "x = y". 2718 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 2719 2720 // If the RHS is a unary plus or minus, check to see if they = and + are 2721 // right next to each other. If so, the user may have typo'd "x =+ 4" 2722 // instead of "x += 4". 2723 Expr *RHSCheck = RHS; 2724 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2725 RHSCheck = ICE->getSubExpr(); 2726 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2727 if ((UO->getOpcode() == UnaryOperator::Plus || 2728 UO->getOpcode() == UnaryOperator::Minus) && 2729 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 2730 // Only if the two operators are exactly adjacent. 2731 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2732 Diag(Loc, diag::warn_not_compound_assign) 2733 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 2734 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 2735 } 2736 } else { 2737 // Compound assignment "x += y" 2738 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 2739 } 2740 2741 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 2742 RHS, "assigning")) 2743 return QualType(); 2744 2745 // C99 6.5.16p3: The type of an assignment expression is the type of the 2746 // left operand unless the left operand has qualified type, in which case 2747 // it is the unqualified version of the type of the left operand. 2748 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2749 // is converted to the type of the assignment expression (above). 2750 // C++ 5.17p1: the type of the assignment expression is that of its left 2751 // oprdu. 2752 return LHSType.getUnqualifiedType(); 2753} 2754 2755// C99 6.5.17 2756QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 2757 // FIXME: what is required for LHS? 2758 2759 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2760 DefaultFunctionArrayConversion(RHS); 2761 return RHS->getType(); 2762} 2763 2764/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2765/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2766QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 2767 bool isInc) { 2768 QualType ResType = Op->getType(); 2769 assert(!ResType.isNull() && "no type for increment/decrement expression"); 2770 2771 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 2772 // Decrement of bool is not allowed. 2773 if (!isInc) { 2774 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 2775 return QualType(); 2776 } 2777 // Increment of bool sets it to true, but is deprecated. 2778 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 2779 } else if (ResType->isRealType()) { 2780 // OK! 2781 } else if (const PointerType *PT = ResType->getAsPointerType()) { 2782 // C99 6.5.2.4p2, 6.5.6p2 2783 if (PT->getPointeeType()->isObjectType()) { 2784 // Pointer to object is ok! 2785 } else if (PT->getPointeeType()->isVoidType()) { 2786 // Pointer to void is extension. 2787 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 2788 } else { 2789 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type) 2790 << ResType << Op->getSourceRange(); 2791 return QualType(); 2792 } 2793 } else if (ResType->isComplexType()) { 2794 // C99 does not support ++/-- on complex types, we allow as an extension. 2795 Diag(OpLoc, diag::ext_integer_increment_complex) 2796 << ResType << Op->getSourceRange(); 2797 } else { 2798 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 2799 << ResType << Op->getSourceRange(); 2800 return QualType(); 2801 } 2802 // At this point, we know we have a real, complex or pointer type. 2803 // Now make sure the operand is a modifiable lvalue. 2804 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 2805 return QualType(); 2806 return ResType; 2807} 2808 2809/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2810/// This routine allows us to typecheck complex/recursive expressions 2811/// where the declaration is needed for type checking. We only need to 2812/// handle cases when the expression references a function designator 2813/// or is an lvalue. Here are some examples: 2814/// - &(x) => x 2815/// - &*****f => f for f a function designator. 2816/// - &s.xx => s 2817/// - &s.zz[1].yy -> s, if zz is an array 2818/// - *(x + 1) -> x, if x is an array 2819/// - &"123"[2] -> 0 2820/// - & __real__ x -> x 2821static NamedDecl *getPrimaryDecl(Expr *E) { 2822 switch (E->getStmtClass()) { 2823 case Stmt::DeclRefExprClass: 2824 return cast<DeclRefExpr>(E)->getDecl(); 2825 case Stmt::MemberExprClass: 2826 // Fields cannot be declared with a 'register' storage class. 2827 // &X->f is always ok, even if X is declared register. 2828 if (cast<MemberExpr>(E)->isArrow()) 2829 return 0; 2830 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2831 case Stmt::ArraySubscriptExprClass: { 2832 // &X[4] and &4[X] refers to X if X is not a pointer. 2833 2834 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2835 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 2836 if (!VD || VD->getType()->isPointerType()) 2837 return 0; 2838 else 2839 return VD; 2840 } 2841 case Stmt::UnaryOperatorClass: { 2842 UnaryOperator *UO = cast<UnaryOperator>(E); 2843 2844 switch(UO->getOpcode()) { 2845 case UnaryOperator::Deref: { 2846 // *(X + 1) refers to X if X is not a pointer. 2847 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 2848 ValueDecl *VD = dyn_cast<ValueDecl>(D); 2849 if (!VD || VD->getType()->isPointerType()) 2850 return 0; 2851 return VD; 2852 } 2853 return 0; 2854 } 2855 case UnaryOperator::Real: 2856 case UnaryOperator::Imag: 2857 case UnaryOperator::Extension: 2858 return getPrimaryDecl(UO->getSubExpr()); 2859 default: 2860 return 0; 2861 } 2862 } 2863 case Stmt::BinaryOperatorClass: { 2864 BinaryOperator *BO = cast<BinaryOperator>(E); 2865 2866 // Handle cases involving pointer arithmetic. The result of an 2867 // Assign or AddAssign is not an lvalue so they can be ignored. 2868 2869 // (x + n) or (n + x) => x 2870 if (BO->getOpcode() == BinaryOperator::Add) { 2871 if (BO->getLHS()->getType()->isPointerType()) { 2872 return getPrimaryDecl(BO->getLHS()); 2873 } else if (BO->getRHS()->getType()->isPointerType()) { 2874 return getPrimaryDecl(BO->getRHS()); 2875 } 2876 } 2877 2878 return 0; 2879 } 2880 case Stmt::ParenExprClass: 2881 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2882 case Stmt::ImplicitCastExprClass: 2883 // &X[4] when X is an array, has an implicit cast from array to pointer. 2884 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2885 default: 2886 return 0; 2887 } 2888} 2889 2890/// CheckAddressOfOperand - The operand of & must be either a function 2891/// designator or an lvalue designating an object. If it is an lvalue, the 2892/// object cannot be declared with storage class register or be a bit field. 2893/// Note: The usual conversions are *not* applied to the operand of the & 2894/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2895/// In C++, the operand might be an overloaded function name, in which case 2896/// we allow the '&' but retain the overloaded-function type. 2897QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2898 if (op->isTypeDependent()) 2899 return Context.DependentTy; 2900 2901 if (getLangOptions().C99) { 2902 // Implement C99-only parts of addressof rules. 2903 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2904 if (uOp->getOpcode() == UnaryOperator::Deref) 2905 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2906 // (assuming the deref expression is valid). 2907 return uOp->getSubExpr()->getType(); 2908 } 2909 // Technically, there should be a check for array subscript 2910 // expressions here, but the result of one is always an lvalue anyway. 2911 } 2912 NamedDecl *dcl = getPrimaryDecl(op); 2913 Expr::isLvalueResult lval = op->isLvalue(Context); 2914 2915 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2916 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2917 // FIXME: emit more specific diag... 2918 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 2919 << op->getSourceRange(); 2920 return QualType(); 2921 } 2922 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2923 if (MemExpr->getMemberDecl()->isBitField()) { 2924 Diag(OpLoc, diag::err_typecheck_address_of) 2925 << "bit-field" << op->getSourceRange(); 2926 return QualType(); 2927 } 2928 // Check for Apple extension for accessing vector components. 2929 } else if (isa<ArraySubscriptExpr>(op) && 2930 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2931 Diag(OpLoc, diag::err_typecheck_address_of) 2932 << "vector" << op->getSourceRange(); 2933 return QualType(); 2934 } else if (dcl) { // C99 6.5.3.2p1 2935 // We have an lvalue with a decl. Make sure the decl is not declared 2936 // with the register storage-class specifier. 2937 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2938 if (vd->getStorageClass() == VarDecl::Register) { 2939 Diag(OpLoc, diag::err_typecheck_address_of) 2940 << "register variable" << op->getSourceRange(); 2941 return QualType(); 2942 } 2943 } else if (isa<OverloadedFunctionDecl>(dcl)) { 2944 return Context.OverloadTy; 2945 } else if (isa<FieldDecl>(dcl)) { 2946 // Okay: we can take the address of a field. 2947 } else if (isa<FunctionDecl>(dcl)) { 2948 // Okay: we can take the address of a function. 2949 } 2950 else 2951 assert(0 && "Unknown/unexpected decl type"); 2952 } 2953 2954 // If the operand has type "type", the result has type "pointer to type". 2955 return Context.getPointerType(op->getType()); 2956} 2957 2958QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 2959 UsualUnaryConversions(Op); 2960 QualType Ty = Op->getType(); 2961 2962 // Note that per both C89 and C99, this is always legal, even if ptype is an 2963 // incomplete type or void. It would be possible to warn about dereferencing 2964 // a void pointer, but it's completely well-defined, and such a warning is 2965 // unlikely to catch any mistakes. 2966 if (const PointerType *PT = Ty->getAsPointerType()) 2967 return PT->getPointeeType(); 2968 2969 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 2970 << Ty << Op->getSourceRange(); 2971 return QualType(); 2972} 2973 2974static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2975 tok::TokenKind Kind) { 2976 BinaryOperator::Opcode Opc; 2977 switch (Kind) { 2978 default: assert(0 && "Unknown binop!"); 2979 case tok::star: Opc = BinaryOperator::Mul; break; 2980 case tok::slash: Opc = BinaryOperator::Div; break; 2981 case tok::percent: Opc = BinaryOperator::Rem; break; 2982 case tok::plus: Opc = BinaryOperator::Add; break; 2983 case tok::minus: Opc = BinaryOperator::Sub; break; 2984 case tok::lessless: Opc = BinaryOperator::Shl; break; 2985 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2986 case tok::lessequal: Opc = BinaryOperator::LE; break; 2987 case tok::less: Opc = BinaryOperator::LT; break; 2988 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2989 case tok::greater: Opc = BinaryOperator::GT; break; 2990 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2991 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2992 case tok::amp: Opc = BinaryOperator::And; break; 2993 case tok::caret: Opc = BinaryOperator::Xor; break; 2994 case tok::pipe: Opc = BinaryOperator::Or; break; 2995 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2996 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2997 case tok::equal: Opc = BinaryOperator::Assign; break; 2998 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2999 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 3000 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 3001 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 3002 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 3003 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 3004 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 3005 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 3006 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 3007 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 3008 case tok::comma: Opc = BinaryOperator::Comma; break; 3009 } 3010 return Opc; 3011} 3012 3013static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 3014 tok::TokenKind Kind) { 3015 UnaryOperator::Opcode Opc; 3016 switch (Kind) { 3017 default: assert(0 && "Unknown unary op!"); 3018 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 3019 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 3020 case tok::amp: Opc = UnaryOperator::AddrOf; break; 3021 case tok::star: Opc = UnaryOperator::Deref; break; 3022 case tok::plus: Opc = UnaryOperator::Plus; break; 3023 case tok::minus: Opc = UnaryOperator::Minus; break; 3024 case tok::tilde: Opc = UnaryOperator::Not; break; 3025 case tok::exclaim: Opc = UnaryOperator::LNot; break; 3026 case tok::kw___real: Opc = UnaryOperator::Real; break; 3027 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 3028 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 3029 } 3030 return Opc; 3031} 3032 3033/// CreateBuiltinBinOp - Creates a new built-in binary operation with 3034/// operator @p Opc at location @c TokLoc. This routine only supports 3035/// built-in operations; ActOnBinOp handles overloaded operators. 3036Action::ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 3037 unsigned Op, 3038 Expr *lhs, Expr *rhs) { 3039 QualType ResultTy; // Result type of the binary operator. 3040 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 3041 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 3042 3043 switch (Opc) { 3044 default: 3045 assert(0 && "Unknown binary expr!"); 3046 case BinaryOperator::Assign: 3047 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 3048 break; 3049 case BinaryOperator::Mul: 3050 case BinaryOperator::Div: 3051 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 3052 break; 3053 case BinaryOperator::Rem: 3054 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 3055 break; 3056 case BinaryOperator::Add: 3057 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 3058 break; 3059 case BinaryOperator::Sub: 3060 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 3061 break; 3062 case BinaryOperator::Shl: 3063 case BinaryOperator::Shr: 3064 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 3065 break; 3066 case BinaryOperator::LE: 3067 case BinaryOperator::LT: 3068 case BinaryOperator::GE: 3069 case BinaryOperator::GT: 3070 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 3071 break; 3072 case BinaryOperator::EQ: 3073 case BinaryOperator::NE: 3074 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 3075 break; 3076 case BinaryOperator::And: 3077 case BinaryOperator::Xor: 3078 case BinaryOperator::Or: 3079 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 3080 break; 3081 case BinaryOperator::LAnd: 3082 case BinaryOperator::LOr: 3083 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 3084 break; 3085 case BinaryOperator::MulAssign: 3086 case BinaryOperator::DivAssign: 3087 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 3088 if (!CompTy.isNull()) 3089 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3090 break; 3091 case BinaryOperator::RemAssign: 3092 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 3093 if (!CompTy.isNull()) 3094 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3095 break; 3096 case BinaryOperator::AddAssign: 3097 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 3098 if (!CompTy.isNull()) 3099 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3100 break; 3101 case BinaryOperator::SubAssign: 3102 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 3103 if (!CompTy.isNull()) 3104 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3105 break; 3106 case BinaryOperator::ShlAssign: 3107 case BinaryOperator::ShrAssign: 3108 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 3109 if (!CompTy.isNull()) 3110 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3111 break; 3112 case BinaryOperator::AndAssign: 3113 case BinaryOperator::XorAssign: 3114 case BinaryOperator::OrAssign: 3115 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 3116 if (!CompTy.isNull()) 3117 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3118 break; 3119 case BinaryOperator::Comma: 3120 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 3121 break; 3122 } 3123 if (ResultTy.isNull()) 3124 return true; 3125 if (CompTy.isNull()) 3126 return new BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc); 3127 else 3128 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, OpLoc); 3129} 3130 3131// Binary Operators. 'Tok' is the token for the operator. 3132Action::ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 3133 tok::TokenKind Kind, 3134 ExprTy *LHS, ExprTy *RHS) { 3135 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 3136 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 3137 3138 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 3139 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 3140 3141 // If either expression is type-dependent, just build the AST. 3142 // FIXME: We'll need to perform some caching of the result of name 3143 // lookup for operator+. 3144 if (lhs->isTypeDependent() || rhs->isTypeDependent()) { 3145 if (Opc > BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) 3146 return new CompoundAssignOperator(lhs, rhs, Opc, Context.DependentTy, 3147 Context.DependentTy, TokLoc); 3148 else 3149 return new BinaryOperator(lhs, rhs, Opc, Context.DependentTy, TokLoc); 3150 } 3151 3152 if (getLangOptions().CPlusPlus && 3153 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 3154 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 3155 // If this is one of the assignment operators, we only perform 3156 // overload resolution if the left-hand side is a class or 3157 // enumeration type (C++ [expr.ass]p3). 3158 if (Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign && 3159 !(lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType())) { 3160 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3161 } 3162 3163 // Determine which overloaded operator we're dealing with. 3164 static const OverloadedOperatorKind OverOps[] = { 3165 OO_Star, OO_Slash, OO_Percent, 3166 OO_Plus, OO_Minus, 3167 OO_LessLess, OO_GreaterGreater, 3168 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 3169 OO_EqualEqual, OO_ExclaimEqual, 3170 OO_Amp, 3171 OO_Caret, 3172 OO_Pipe, 3173 OO_AmpAmp, 3174 OO_PipePipe, 3175 OO_Equal, OO_StarEqual, 3176 OO_SlashEqual, OO_PercentEqual, 3177 OO_PlusEqual, OO_MinusEqual, 3178 OO_LessLessEqual, OO_GreaterGreaterEqual, 3179 OO_AmpEqual, OO_CaretEqual, 3180 OO_PipeEqual, 3181 OO_Comma 3182 }; 3183 OverloadedOperatorKind OverOp = OverOps[Opc]; 3184 3185 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3186 // to the candidate set. 3187 OverloadCandidateSet CandidateSet; 3188 Expr *Args[2] = { lhs, rhs }; 3189 AddOperatorCandidates(OverOp, S, Args, 2, CandidateSet); 3190 3191 // Perform overload resolution. 3192 OverloadCandidateSet::iterator Best; 3193 switch (BestViableFunction(CandidateSet, Best)) { 3194 case OR_Success: { 3195 // We found a built-in operator or an overloaded operator. 3196 FunctionDecl *FnDecl = Best->Function; 3197 3198 if (FnDecl) { 3199 // We matched an overloaded operator. Build a call to that 3200 // operator. 3201 3202 // Convert the arguments. 3203 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3204 if (PerformObjectArgumentInitialization(lhs, Method) || 3205 PerformCopyInitialization(rhs, FnDecl->getParamDecl(0)->getType(), 3206 "passing")) 3207 return true; 3208 } else { 3209 // Convert the arguments. 3210 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 3211 "passing") || 3212 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 3213 "passing")) 3214 return true; 3215 } 3216 3217 // Determine the result type 3218 QualType ResultTy 3219 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3220 ResultTy = ResultTy.getNonReferenceType(); 3221 3222 // Build the actual expression node. 3223 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 3224 SourceLocation()); 3225 UsualUnaryConversions(FnExpr); 3226 3227 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, TokLoc); 3228 } else { 3229 // We matched a built-in operator. Convert the arguments, then 3230 // break out so that we will build the appropriate built-in 3231 // operator node. 3232 if (PerformCopyInitialization(lhs, Best->BuiltinTypes.ParamTypes[0], 3233 "passing") || 3234 PerformCopyInitialization(rhs, Best->BuiltinTypes.ParamTypes[1], 3235 "passing")) 3236 return true; 3237 3238 break; 3239 } 3240 } 3241 3242 case OR_No_Viable_Function: 3243 // No viable function; fall through to handling this as a 3244 // built-in operator, which will produce an error message for us. 3245 break; 3246 3247 case OR_Ambiguous: 3248 Diag(TokLoc, diag::err_ovl_ambiguous_oper) 3249 << BinaryOperator::getOpcodeStr(Opc) 3250 << lhs->getSourceRange() << rhs->getSourceRange(); 3251 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3252 return true; 3253 } 3254 3255 // Either we found no viable overloaded operator or we matched a 3256 // built-in operator. In either case, fall through to trying to 3257 // build a built-in operation. 3258 } 3259 3260 // Build a built-in binary operation. 3261 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3262} 3263 3264// Unary Operators. 'Tok' is the token for the operator. 3265Action::ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 3266 tok::TokenKind Op, ExprTy *input) { 3267 Expr *Input = (Expr*)input; 3268 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 3269 3270 if (getLangOptions().CPlusPlus && 3271 (Input->getType()->isRecordType() 3272 || Input->getType()->isEnumeralType())) { 3273 // Determine which overloaded operator we're dealing with. 3274 static const OverloadedOperatorKind OverOps[] = { 3275 OO_None, OO_None, 3276 OO_PlusPlus, OO_MinusMinus, 3277 OO_Amp, OO_Star, 3278 OO_Plus, OO_Minus, 3279 OO_Tilde, OO_Exclaim, 3280 OO_None, OO_None, 3281 OO_None, 3282 OO_None 3283 }; 3284 OverloadedOperatorKind OverOp = OverOps[Opc]; 3285 3286 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3287 // to the candidate set. 3288 OverloadCandidateSet CandidateSet; 3289 if (OverOp != OO_None) 3290 AddOperatorCandidates(OverOp, S, &Input, 1, CandidateSet); 3291 3292 // Perform overload resolution. 3293 OverloadCandidateSet::iterator Best; 3294 switch (BestViableFunction(CandidateSet, Best)) { 3295 case OR_Success: { 3296 // We found a built-in operator or an overloaded operator. 3297 FunctionDecl *FnDecl = Best->Function; 3298 3299 if (FnDecl) { 3300 // We matched an overloaded operator. Build a call to that 3301 // operator. 3302 3303 // Convert the arguments. 3304 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3305 if (PerformObjectArgumentInitialization(Input, Method)) 3306 return true; 3307 } else { 3308 // Convert the arguments. 3309 if (PerformCopyInitialization(Input, 3310 FnDecl->getParamDecl(0)->getType(), 3311 "passing")) 3312 return true; 3313 } 3314 3315 // Determine the result type 3316 QualType ResultTy 3317 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3318 ResultTy = ResultTy.getNonReferenceType(); 3319 3320 // Build the actual expression node. 3321 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 3322 SourceLocation()); 3323 UsualUnaryConversions(FnExpr); 3324 3325 return new CXXOperatorCallExpr(FnExpr, &Input, 1, ResultTy, OpLoc); 3326 } else { 3327 // We matched a built-in operator. Convert the arguments, then 3328 // break out so that we will build the appropriate built-in 3329 // operator node. 3330 if (PerformCopyInitialization(Input, Best->BuiltinTypes.ParamTypes[0], 3331 "passing")) 3332 return true; 3333 3334 break; 3335 } 3336 } 3337 3338 case OR_No_Viable_Function: 3339 // No viable function; fall through to handling this as a 3340 // built-in operator, which will produce an error message for us. 3341 break; 3342 3343 case OR_Ambiguous: 3344 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 3345 << UnaryOperator::getOpcodeStr(Opc) 3346 << Input->getSourceRange(); 3347 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3348 return true; 3349 } 3350 3351 // Either we found no viable overloaded operator or we matched a 3352 // built-in operator. In either case, fall through to trying to 3353 // build a built-in operation. 3354 } 3355 3356 QualType resultType; 3357 switch (Opc) { 3358 default: 3359 assert(0 && "Unimplemented unary expr!"); 3360 case UnaryOperator::PreInc: 3361 case UnaryOperator::PreDec: 3362 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 3363 Opc == UnaryOperator::PreInc); 3364 break; 3365 case UnaryOperator::AddrOf: 3366 resultType = CheckAddressOfOperand(Input, OpLoc); 3367 break; 3368 case UnaryOperator::Deref: 3369 DefaultFunctionArrayConversion(Input); 3370 resultType = CheckIndirectionOperand(Input, OpLoc); 3371 break; 3372 case UnaryOperator::Plus: 3373 case UnaryOperator::Minus: 3374 UsualUnaryConversions(Input); 3375 resultType = Input->getType(); 3376 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 3377 break; 3378 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 3379 resultType->isEnumeralType()) 3380 break; 3381 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 3382 Opc == UnaryOperator::Plus && 3383 resultType->isPointerType()) 3384 break; 3385 3386 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3387 << resultType << Input->getSourceRange(); 3388 case UnaryOperator::Not: // bitwise complement 3389 UsualUnaryConversions(Input); 3390 resultType = Input->getType(); 3391 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 3392 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 3393 // C99 does not support '~' for complex conjugation. 3394 Diag(OpLoc, diag::ext_integer_complement_complex) 3395 << resultType << Input->getSourceRange(); 3396 else if (!resultType->isIntegerType()) 3397 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3398 << resultType << Input->getSourceRange(); 3399 break; 3400 case UnaryOperator::LNot: // logical negation 3401 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 3402 DefaultFunctionArrayConversion(Input); 3403 resultType = Input->getType(); 3404 if (!resultType->isScalarType()) // C99 6.5.3.3p1 3405 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3406 << resultType << Input->getSourceRange(); 3407 // LNot always has type int. C99 6.5.3.3p5. 3408 resultType = Context.IntTy; 3409 break; 3410 case UnaryOperator::Real: 3411 case UnaryOperator::Imag: 3412 resultType = CheckRealImagOperand(Input, OpLoc); 3413 break; 3414 case UnaryOperator::Extension: 3415 resultType = Input->getType(); 3416 break; 3417 } 3418 if (resultType.isNull()) 3419 return true; 3420 return new UnaryOperator(Input, Opc, resultType, OpLoc); 3421} 3422 3423/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 3424Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 3425 SourceLocation LabLoc, 3426 IdentifierInfo *LabelII) { 3427 // Look up the record for this label identifier. 3428 LabelStmt *&LabelDecl = LabelMap[LabelII]; 3429 3430 // If we haven't seen this label yet, create a forward reference. It 3431 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 3432 if (LabelDecl == 0) 3433 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 3434 3435 // Create the AST node. The address of a label always has type 'void*'. 3436 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 3437 Context.getPointerType(Context.VoidTy)); 3438} 3439 3440Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 3441 SourceLocation RPLoc) { // "({..})" 3442 Stmt *SubStmt = static_cast<Stmt*>(substmt); 3443 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 3444 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 3445 3446 // FIXME: there are a variety of strange constraints to enforce here, for 3447 // example, it is not possible to goto into a stmt expression apparently. 3448 // More semantic analysis is needed. 3449 3450 // FIXME: the last statement in the compount stmt has its value used. We 3451 // should not warn about it being unused. 3452 3453 // If there are sub stmts in the compound stmt, take the type of the last one 3454 // as the type of the stmtexpr. 3455 QualType Ty = Context.VoidTy; 3456 3457 if (!Compound->body_empty()) { 3458 Stmt *LastStmt = Compound->body_back(); 3459 // If LastStmt is a label, skip down through into the body. 3460 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 3461 LastStmt = Label->getSubStmt(); 3462 3463 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 3464 Ty = LastExpr->getType(); 3465 } 3466 3467 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 3468} 3469 3470Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 3471 SourceLocation TypeLoc, 3472 TypeTy *argty, 3473 OffsetOfComponent *CompPtr, 3474 unsigned NumComponents, 3475 SourceLocation RPLoc) { 3476 QualType ArgTy = QualType::getFromOpaquePtr(argty); 3477 assert(!ArgTy.isNull() && "Missing type argument!"); 3478 3479 // We must have at least one component that refers to the type, and the first 3480 // one is known to be a field designator. Verify that the ArgTy represents 3481 // a struct/union/class. 3482 if (!ArgTy->isRecordType()) 3483 return Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy; 3484 3485 // Otherwise, create a compound literal expression as the base, and 3486 // iteratively process the offsetof designators. 3487 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 3488 3489 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 3490 // GCC extension, diagnose them. 3491 if (NumComponents != 1) 3492 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 3493 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 3494 3495 for (unsigned i = 0; i != NumComponents; ++i) { 3496 const OffsetOfComponent &OC = CompPtr[i]; 3497 if (OC.isBrackets) { 3498 // Offset of an array sub-field. TODO: Should we allow vector elements? 3499 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 3500 if (!AT) { 3501 delete Res; 3502 return Diag(OC.LocEnd, diag::err_offsetof_array_type) << Res->getType(); 3503 } 3504 3505 // FIXME: C++: Verify that operator[] isn't overloaded. 3506 3507 // C99 6.5.2.1p1 3508 Expr *Idx = static_cast<Expr*>(OC.U.E); 3509 if (!Idx->getType()->isIntegerType()) 3510 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript) 3511 << Idx->getSourceRange(); 3512 3513 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 3514 continue; 3515 } 3516 3517 const RecordType *RC = Res->getType()->getAsRecordType(); 3518 if (!RC) { 3519 delete Res; 3520 return Diag(OC.LocEnd, diag::err_offsetof_record_type) << Res->getType(); 3521 } 3522 3523 // Get the decl corresponding to this. 3524 RecordDecl *RD = RC->getDecl(); 3525 FieldDecl *MemberDecl = 0; 3526 DeclContext::lookup_result Lookup = RD->lookup(Context, OC.U.IdentInfo); 3527 if (Lookup.first != Lookup.second) 3528 MemberDecl = dyn_cast<FieldDecl>(*Lookup.first); 3529 3530 if (!MemberDecl) 3531 return Diag(BuiltinLoc, diag::err_typecheck_no_member) 3532 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd); 3533 3534 // FIXME: C++: Verify that MemberDecl isn't a static field. 3535 // FIXME: Verify that MemberDecl isn't a bitfield. 3536 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 3537 // matter here. 3538 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, 3539 MemberDecl->getType().getNonReferenceType()); 3540 } 3541 3542 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 3543 BuiltinLoc); 3544} 3545 3546 3547Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 3548 TypeTy *arg1, TypeTy *arg2, 3549 SourceLocation RPLoc) { 3550 QualType argT1 = QualType::getFromOpaquePtr(arg1); 3551 QualType argT2 = QualType::getFromOpaquePtr(arg2); 3552 3553 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 3554 3555 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 3556} 3557 3558Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 3559 ExprTy *expr1, ExprTy *expr2, 3560 SourceLocation RPLoc) { 3561 Expr *CondExpr = static_cast<Expr*>(cond); 3562 Expr *LHSExpr = static_cast<Expr*>(expr1); 3563 Expr *RHSExpr = static_cast<Expr*>(expr2); 3564 3565 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 3566 3567 // The conditional expression is required to be a constant expression. 3568 llvm::APSInt condEval(32); 3569 SourceLocation ExpLoc; 3570 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 3571 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant) 3572 << CondExpr->getSourceRange(); 3573 3574 // If the condition is > zero, then the AST type is the same as the LSHExpr. 3575 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 3576 RHSExpr->getType(); 3577 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 3578} 3579 3580//===----------------------------------------------------------------------===// 3581// Clang Extensions. 3582//===----------------------------------------------------------------------===// 3583 3584/// ActOnBlockStart - This callback is invoked when a block literal is started. 3585void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 3586 // Analyze block parameters. 3587 BlockSemaInfo *BSI = new BlockSemaInfo(); 3588 3589 // Add BSI to CurBlock. 3590 BSI->PrevBlockInfo = CurBlock; 3591 CurBlock = BSI; 3592 3593 BSI->ReturnType = 0; 3594 BSI->TheScope = BlockScope; 3595 3596 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 3597 PushDeclContext(BlockScope, BSI->TheDecl); 3598} 3599 3600void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 3601 // Analyze arguments to block. 3602 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 3603 "Not a function declarator!"); 3604 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 3605 3606 CurBlock->hasPrototype = FTI.hasPrototype; 3607 CurBlock->isVariadic = true; 3608 3609 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 3610 // no arguments, not a function that takes a single void argument. 3611 if (FTI.hasPrototype && 3612 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3613 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 3614 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 3615 // empty arg list, don't push any params. 3616 CurBlock->isVariadic = false; 3617 } else if (FTI.hasPrototype) { 3618 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 3619 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 3620 CurBlock->isVariadic = FTI.isVariadic; 3621 } 3622 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 3623 3624 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 3625 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 3626 // If this has an identifier, add it to the scope stack. 3627 if ((*AI)->getIdentifier()) 3628 PushOnScopeChains(*AI, CurBlock->TheScope); 3629} 3630 3631/// ActOnBlockError - If there is an error parsing a block, this callback 3632/// is invoked to pop the information about the block from the action impl. 3633void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 3634 // Ensure that CurBlock is deleted. 3635 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 3636 3637 // Pop off CurBlock, handle nested blocks. 3638 CurBlock = CurBlock->PrevBlockInfo; 3639 3640 // FIXME: Delete the ParmVarDecl objects as well??? 3641 3642} 3643 3644/// ActOnBlockStmtExpr - This is called when the body of a block statement 3645/// literal was successfully completed. ^(int x){...} 3646Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 3647 Scope *CurScope) { 3648 // Ensure that CurBlock is deleted. 3649 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 3650 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 3651 3652 PopDeclContext(); 3653 3654 // Pop off CurBlock, handle nested blocks. 3655 CurBlock = CurBlock->PrevBlockInfo; 3656 3657 QualType RetTy = Context.VoidTy; 3658 if (BSI->ReturnType) 3659 RetTy = QualType(BSI->ReturnType, 0); 3660 3661 llvm::SmallVector<QualType, 8> ArgTypes; 3662 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 3663 ArgTypes.push_back(BSI->Params[i]->getType()); 3664 3665 QualType BlockTy; 3666 if (!BSI->hasPrototype) 3667 BlockTy = Context.getFunctionTypeNoProto(RetTy); 3668 else 3669 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 3670 BSI->isVariadic, 0); 3671 3672 BlockTy = Context.getBlockPointerType(BlockTy); 3673 3674 BSI->TheDecl->setBody(Body.take()); 3675 return new BlockExpr(BSI->TheDecl, BlockTy); 3676} 3677 3678/// ExprsMatchFnType - return true if the Exprs in array Args have 3679/// QualTypes that match the QualTypes of the arguments of the FnType. 3680/// The number of arguments has already been validated to match the number of 3681/// arguments in FnType. 3682static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 3683 ASTContext &Context) { 3684 unsigned NumParams = FnType->getNumArgs(); 3685 for (unsigned i = 0; i != NumParams; ++i) { 3686 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 3687 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 3688 3689 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 3690 return false; 3691 } 3692 return true; 3693} 3694 3695Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 3696 SourceLocation *CommaLocs, 3697 SourceLocation BuiltinLoc, 3698 SourceLocation RParenLoc) { 3699 // __builtin_overload requires at least 2 arguments 3700 if (NumArgs < 2) 3701 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 3702 << SourceRange(BuiltinLoc, RParenLoc); 3703 3704 // The first argument is required to be a constant expression. It tells us 3705 // the number of arguments to pass to each of the functions to be overloaded. 3706 Expr **Args = reinterpret_cast<Expr**>(args); 3707 Expr *NParamsExpr = Args[0]; 3708 llvm::APSInt constEval(32); 3709 SourceLocation ExpLoc; 3710 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 3711 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 3712 << NParamsExpr->getSourceRange(); 3713 3714 // Verify that the number of parameters is > 0 3715 unsigned NumParams = constEval.getZExtValue(); 3716 if (NumParams == 0) 3717 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 3718 << NParamsExpr->getSourceRange(); 3719 // Verify that we have at least 1 + NumParams arguments to the builtin. 3720 if ((NumParams + 1) > NumArgs) 3721 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 3722 << SourceRange(BuiltinLoc, RParenLoc); 3723 3724 // Figure out the return type, by matching the args to one of the functions 3725 // listed after the parameters. 3726 OverloadExpr *OE = 0; 3727 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 3728 // UsualUnaryConversions will convert the function DeclRefExpr into a 3729 // pointer to function. 3730 Expr *Fn = UsualUnaryConversions(Args[i]); 3731 const FunctionTypeProto *FnType = 0; 3732 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3733 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3734 3735 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3736 // parameters, and the number of parameters must match the value passed to 3737 // the builtin. 3738 if (!FnType || (FnType->getNumArgs() != NumParams)) 3739 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype) 3740 << Fn->getSourceRange(); 3741 3742 // Scan the parameter list for the FunctionType, checking the QualType of 3743 // each parameter against the QualTypes of the arguments to the builtin. 3744 // If they match, return a new OverloadExpr. 3745 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3746 if (OE) 3747 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match) 3748 << OE->getFn()->getSourceRange(); 3749 // Remember our match, and continue processing the remaining arguments 3750 // to catch any errors. 3751 OE = new OverloadExpr(Args, NumArgs, i, 3752 FnType->getResultType().getNonReferenceType(), 3753 BuiltinLoc, RParenLoc); 3754 } 3755 } 3756 // Return the newly created OverloadExpr node, if we succeded in matching 3757 // exactly one of the candidate functions. 3758 if (OE) 3759 return OE; 3760 3761 // If we didn't find a matching function Expr in the __builtin_overload list 3762 // the return an error. 3763 std::string typeNames; 3764 for (unsigned i = 0; i != NumParams; ++i) { 3765 if (i != 0) typeNames += ", "; 3766 typeNames += Args[i+1]->getType().getAsString(); 3767 } 3768 3769 return Diag(BuiltinLoc, diag::err_overload_no_match) 3770 << typeNames << SourceRange(BuiltinLoc, RParenLoc); 3771} 3772 3773Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3774 ExprTy *expr, TypeTy *type, 3775 SourceLocation RPLoc) { 3776 Expr *E = static_cast<Expr*>(expr); 3777 QualType T = QualType::getFromOpaquePtr(type); 3778 3779 InitBuiltinVaListType(); 3780 3781 // Get the va_list type 3782 QualType VaListType = Context.getBuiltinVaListType(); 3783 // Deal with implicit array decay; for example, on x86-64, 3784 // va_list is an array, but it's supposed to decay to 3785 // a pointer for va_arg. 3786 if (VaListType->isArrayType()) 3787 VaListType = Context.getArrayDecayedType(VaListType); 3788 // Make sure the input expression also decays appropriately. 3789 UsualUnaryConversions(E); 3790 3791 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3792 return Diag(E->getLocStart(), 3793 diag::err_first_argument_to_va_arg_not_of_type_va_list) 3794 << E->getType() << E->getSourceRange(); 3795 3796 // FIXME: Warn if a non-POD type is passed in. 3797 3798 return new VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 3799} 3800 3801Sema::ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 3802 // The type of __null will be int or long, depending on the size of 3803 // pointers on the target. 3804 QualType Ty; 3805 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 3806 Ty = Context.IntTy; 3807 else 3808 Ty = Context.LongTy; 3809 3810 return new GNUNullExpr(Ty, TokenLoc); 3811} 3812 3813bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3814 SourceLocation Loc, 3815 QualType DstType, QualType SrcType, 3816 Expr *SrcExpr, const char *Flavor) { 3817 // Decode the result (notice that AST's are still created for extensions). 3818 bool isInvalid = false; 3819 unsigned DiagKind; 3820 switch (ConvTy) { 3821 default: assert(0 && "Unknown conversion type"); 3822 case Compatible: return false; 3823 case PointerToInt: 3824 DiagKind = diag::ext_typecheck_convert_pointer_int; 3825 break; 3826 case IntToPointer: 3827 DiagKind = diag::ext_typecheck_convert_int_pointer; 3828 break; 3829 case IncompatiblePointer: 3830 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3831 break; 3832 case FunctionVoidPointer: 3833 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3834 break; 3835 case CompatiblePointerDiscardsQualifiers: 3836 // If the qualifiers lost were because we were applying the 3837 // (deprecated) C++ conversion from a string literal to a char* 3838 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3839 // Ideally, this check would be performed in 3840 // CheckPointerTypesForAssignment. However, that would require a 3841 // bit of refactoring (so that the second argument is an 3842 // expression, rather than a type), which should be done as part 3843 // of a larger effort to fix CheckPointerTypesForAssignment for 3844 // C++ semantics. 3845 if (getLangOptions().CPlusPlus && 3846 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3847 return false; 3848 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3849 break; 3850 case IntToBlockPointer: 3851 DiagKind = diag::err_int_to_block_pointer; 3852 break; 3853 case IncompatibleBlockPointer: 3854 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3855 break; 3856 case IncompatibleObjCQualifiedId: 3857 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3858 // it can give a more specific diagnostic. 3859 DiagKind = diag::warn_incompatible_qualified_id; 3860 break; 3861 case Incompatible: 3862 DiagKind = diag::err_typecheck_convert_incompatible; 3863 isInvalid = true; 3864 break; 3865 } 3866 3867 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 3868 << SrcExpr->getSourceRange(); 3869 return isInvalid; 3870} 3871 3872bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 3873{ 3874 Expr::EvalResult EvalResult; 3875 3876 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 3877 EvalResult.HasSideEffects) { 3878 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 3879 3880 if (EvalResult.Diag) { 3881 // We only show the note if it's not the usual "invalid subexpression" 3882 // or if it's actually in a subexpression. 3883 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 3884 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 3885 Diag(EvalResult.DiagLoc, EvalResult.Diag); 3886 } 3887 3888 return true; 3889 } 3890 3891 if (EvalResult.Diag) { 3892 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 3893 E->getSourceRange(); 3894 3895 // Print the reason it's not a constant. 3896 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 3897 Diag(EvalResult.DiagLoc, EvalResult.Diag); 3898 } 3899 3900 if (Result) 3901 *Result = EvalResult.Val.getInt(); 3902 return false; 3903} 3904