SemaExpr.cpp revision 1a68ecfee1e63cd59b762d789b137b8e20623ee0
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 FieldDecl *FD = IFace->lookupFieldDeclForIvar(Context, IV); 422 // FIXME: This should use a new expr for a direct reference, don't turn 423 // this into Self->ivar, just return a BareIVarExpr or something. 424 IdentifierInfo &II = Context.Idents.get("self"); 425 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 426 return new ObjCIvarRefExpr(IV, FD, IV->getType(), Loc, 427 static_cast<Expr*>(SelfExpr.Val), true, true); 428 } 429 } 430 // Needed to implement property "super.method" notation. 431 if (SD == 0 && II->isStr("super")) { 432 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 433 getCurMethodDecl()->getClassInterface())); 434 return new ObjCSuperExpr(Loc, T); 435 } 436 } 437 if (D == 0) { 438 // Otherwise, this could be an implicitly declared function reference (legal 439 // in C90, extension in C99). 440 if (HasTrailingLParen && II && 441 !getLangOptions().CPlusPlus) // Not in C++. 442 D = ImplicitlyDefineFunction(Loc, *II, S); 443 else { 444 // If this name wasn't predeclared and if this is not a function call, 445 // diagnose the problem. 446 if (SS && !SS->isEmpty()) 447 return Diag(Loc, diag::err_typecheck_no_member) 448 << Name << SS->getRange(); 449 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 450 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 451 return Diag(Loc, diag::err_undeclared_use) << Name.getAsString(); 452 else 453 return Diag(Loc, diag::err_undeclared_var_use) << Name; 454 } 455 } 456 457 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 458 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 459 if (MD->isStatic()) 460 // "invalid use of member 'x' in static member function" 461 return Diag(Loc, diag::err_invalid_member_use_in_static_method) 462 << FD->getDeclName(); 463 if (MD->getParent() != FD->getDeclContext()) 464 // "invalid use of nonstatic data member 'x'" 465 return Diag(Loc, diag::err_invalid_non_static_member_use) 466 << FD->getDeclName(); 467 468 if (FD->isInvalidDecl()) 469 return true; 470 471 // FIXME: Handle 'mutable'. 472 return new DeclRefExpr(FD, 473 FD->getType().getWithAdditionalQualifiers(MD->getTypeQualifiers()),Loc); 474 } 475 476 return Diag(Loc, diag::err_invalid_non_static_member_use) 477 << FD->getDeclName(); 478 } 479 if (isa<TypedefDecl>(D)) 480 return Diag(Loc, diag::err_unexpected_typedef) << Name; 481 if (isa<ObjCInterfaceDecl>(D)) 482 return Diag(Loc, diag::err_unexpected_interface) << Name; 483 if (isa<NamespaceDecl>(D)) 484 return Diag(Loc, diag::err_unexpected_namespace) << Name; 485 486 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 487 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 488 return new DeclRefExpr(Ovl, Context.OverloadTy, Loc); 489 490 ValueDecl *VD = cast<ValueDecl>(D); 491 492 // check if referencing an identifier with __attribute__((deprecated)). 493 if (VD->getAttr<DeprecatedAttr>()) 494 Diag(Loc, diag::warn_deprecated) << VD->getDeclName(); 495 496 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 497 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 498 Scope *CheckS = S; 499 while (CheckS) { 500 if (CheckS->isWithinElse() && 501 CheckS->getControlParent()->isDeclScope(Var)) { 502 if (Var->getType()->isBooleanType()) 503 Diag(Loc, diag::warn_value_always_false) << Var->getDeclName(); 504 else 505 Diag(Loc, diag::warn_value_always_zero) << Var->getDeclName(); 506 break; 507 } 508 509 // Move up one more control parent to check again. 510 CheckS = CheckS->getControlParent(); 511 if (CheckS) 512 CheckS = CheckS->getParent(); 513 } 514 } 515 } 516 517 // Only create DeclRefExpr's for valid Decl's. 518 if (VD->isInvalidDecl()) 519 return true; 520 521 // If the identifier reference is inside a block, and it refers to a value 522 // that is outside the block, create a BlockDeclRefExpr instead of a 523 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 524 // the block is formed. 525 // 526 // We do not do this for things like enum constants, global variables, etc, 527 // as they do not get snapshotted. 528 // 529 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 530 // The BlocksAttr indicates the variable is bound by-reference. 531 if (VD->getAttr<BlocksAttr>()) 532 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 533 Loc, true); 534 535 // Variable will be bound by-copy, make it const within the closure. 536 VD->getType().addConst(); 537 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 538 Loc, false); 539 } 540 // If this reference is not in a block or if the referenced variable is 541 // within the block, create a normal DeclRefExpr. 542 543 bool TypeDependent = false; 544 bool ValueDependent = false; 545 if (getLangOptions().CPlusPlus) { 546 // C++ [temp.dep.expr]p3: 547 // An id-expression is type-dependent if it contains: 548 // - an identifier that was declared with a dependent type, 549 if (VD->getType()->isDependentType()) 550 TypeDependent = true; 551 // - FIXME: a template-id that is dependent, 552 // - a conversion-function-id that specifies a dependent type, 553 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 554 Name.getCXXNameType()->isDependentType()) 555 TypeDependent = true; 556 // - a nested-name-specifier that contains a class-name that 557 // names a dependent type. 558 else if (SS && !SS->isEmpty()) { 559 for (DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 560 DC; DC = DC->getParent()) { 561 // FIXME: could stop early at namespace scope. 562 if (DC->isCXXRecord()) { 563 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 564 if (Context.getTypeDeclType(Record)->isDependentType()) { 565 TypeDependent = true; 566 break; 567 } 568 } 569 } 570 } 571 572 // C++ [temp.dep.constexpr]p2: 573 // 574 // An identifier is value-dependent if it is: 575 // - a name declared with a dependent type, 576 if (TypeDependent) 577 ValueDependent = true; 578 // - the name of a non-type template parameter, 579 else if (isa<NonTypeTemplateParmDecl>(VD)) 580 ValueDependent = true; 581 // - a constant with integral or enumeration type and is 582 // initialized with an expression that is value-dependent 583 // (FIXME!). 584 } 585 586 return new DeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 587 TypeDependent, ValueDependent); 588} 589 590Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 591 tok::TokenKind Kind) { 592 PredefinedExpr::IdentType IT; 593 594 switch (Kind) { 595 default: assert(0 && "Unknown simple primary expr!"); 596 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 597 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 598 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 599 } 600 601 // Pre-defined identifiers are of type char[x], where x is the length of the 602 // string. 603 unsigned Length; 604 if (FunctionDecl *FD = getCurFunctionDecl()) 605 Length = FD->getIdentifier()->getLength(); 606 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 607 Length = MD->getSynthesizedMethodSize(); 608 else { 609 Diag(Loc, diag::ext_predef_outside_function); 610 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 611 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 612 } 613 614 615 llvm::APInt LengthI(32, Length + 1); 616 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 617 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 618 return new PredefinedExpr(Loc, ResTy, IT); 619} 620 621Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 622 llvm::SmallString<16> CharBuffer; 623 CharBuffer.resize(Tok.getLength()); 624 const char *ThisTokBegin = &CharBuffer[0]; 625 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 626 627 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 628 Tok.getLocation(), PP); 629 if (Literal.hadError()) 630 return ExprResult(true); 631 632 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 633 634 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 635 Tok.getLocation()); 636} 637 638Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 639 // fast path for a single digit (which is quite common). A single digit 640 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 641 if (Tok.getLength() == 1) { 642 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 643 644 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 645 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 646 Context.IntTy, 647 Tok.getLocation())); 648 } 649 llvm::SmallString<512> IntegerBuffer; 650 // Add padding so that NumericLiteralParser can overread by one character. 651 IntegerBuffer.resize(Tok.getLength()+1); 652 const char *ThisTokBegin = &IntegerBuffer[0]; 653 654 // Get the spelling of the token, which eliminates trigraphs, etc. 655 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 656 657 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 658 Tok.getLocation(), PP); 659 if (Literal.hadError) 660 return ExprResult(true); 661 662 Expr *Res; 663 664 if (Literal.isFloatingLiteral()) { 665 QualType Ty; 666 if (Literal.isFloat) 667 Ty = Context.FloatTy; 668 else if (!Literal.isLong) 669 Ty = Context.DoubleTy; 670 else 671 Ty = Context.LongDoubleTy; 672 673 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 674 675 // isExact will be set by GetFloatValue(). 676 bool isExact = false; 677 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 678 Ty, Tok.getLocation()); 679 680 } else if (!Literal.isIntegerLiteral()) { 681 return ExprResult(true); 682 } else { 683 QualType Ty; 684 685 // long long is a C99 feature. 686 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 687 Literal.isLongLong) 688 Diag(Tok.getLocation(), diag::ext_longlong); 689 690 // Get the value in the widest-possible width. 691 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 692 693 if (Literal.GetIntegerValue(ResultVal)) { 694 // If this value didn't fit into uintmax_t, warn and force to ull. 695 Diag(Tok.getLocation(), diag::warn_integer_too_large); 696 Ty = Context.UnsignedLongLongTy; 697 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 698 "long long is not intmax_t?"); 699 } else { 700 // If this value fits into a ULL, try to figure out what else it fits into 701 // according to the rules of C99 6.4.4.1p5. 702 703 // Octal, Hexadecimal, and integers with a U suffix are allowed to 704 // be an unsigned int. 705 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 706 707 // Check from smallest to largest, picking the smallest type we can. 708 unsigned Width = 0; 709 if (!Literal.isLong && !Literal.isLongLong) { 710 // Are int/unsigned possibilities? 711 unsigned IntSize = Context.Target.getIntWidth(); 712 713 // Does it fit in a unsigned int? 714 if (ResultVal.isIntN(IntSize)) { 715 // Does it fit in a signed int? 716 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 717 Ty = Context.IntTy; 718 else if (AllowUnsigned) 719 Ty = Context.UnsignedIntTy; 720 Width = IntSize; 721 } 722 } 723 724 // Are long/unsigned long possibilities? 725 if (Ty.isNull() && !Literal.isLongLong) { 726 unsigned LongSize = Context.Target.getLongWidth(); 727 728 // Does it fit in a unsigned long? 729 if (ResultVal.isIntN(LongSize)) { 730 // Does it fit in a signed long? 731 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 732 Ty = Context.LongTy; 733 else if (AllowUnsigned) 734 Ty = Context.UnsignedLongTy; 735 Width = LongSize; 736 } 737 } 738 739 // Finally, check long long if needed. 740 if (Ty.isNull()) { 741 unsigned LongLongSize = Context.Target.getLongLongWidth(); 742 743 // Does it fit in a unsigned long long? 744 if (ResultVal.isIntN(LongLongSize)) { 745 // Does it fit in a signed long long? 746 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 747 Ty = Context.LongLongTy; 748 else if (AllowUnsigned) 749 Ty = Context.UnsignedLongLongTy; 750 Width = LongLongSize; 751 } 752 } 753 754 // If we still couldn't decide a type, we probably have something that 755 // does not fit in a signed long long, but has no U suffix. 756 if (Ty.isNull()) { 757 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 758 Ty = Context.UnsignedLongLongTy; 759 Width = Context.Target.getLongLongWidth(); 760 } 761 762 if (ResultVal.getBitWidth() != Width) 763 ResultVal.trunc(Width); 764 } 765 766 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 767 } 768 769 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 770 if (Literal.isImaginary) 771 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 772 773 return Res; 774} 775 776Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 777 ExprTy *Val) { 778 Expr *E = (Expr *)Val; 779 assert((E != 0) && "ActOnParenExpr() missing expr"); 780 return new ParenExpr(L, R, E); 781} 782 783/// The UsualUnaryConversions() function is *not* called by this routine. 784/// See C99 6.3.2.1p[2-4] for more details. 785bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 786 SourceLocation OpLoc, 787 const SourceRange &ExprRange, 788 bool isSizeof) { 789 // C99 6.5.3.4p1: 790 if (isa<FunctionType>(exprType) && isSizeof) 791 // alignof(function) is allowed. 792 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 793 else if (exprType->isVoidType()) 794 Diag(OpLoc, diag::ext_sizeof_void_type) 795 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 796 else if (exprType->isIncompleteType()) 797 return Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 798 diag::err_alignof_incomplete_type) 799 << exprType << ExprRange; 800 801 return false; 802} 803 804/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 805/// the same for @c alignof and @c __alignof 806/// Note that the ArgRange is invalid if isType is false. 807Action::ExprResult 808Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 809 void *TyOrEx, const SourceRange &ArgRange) { 810 // If error parsing type, ignore. 811 if (TyOrEx == 0) return true; 812 813 QualType ArgTy; 814 SourceRange Range; 815 if (isType) { 816 ArgTy = QualType::getFromOpaquePtr(TyOrEx); 817 Range = ArgRange; 818 } else { 819 // Get the end location. 820 Expr *ArgEx = (Expr *)TyOrEx; 821 Range = ArgEx->getSourceRange(); 822 ArgTy = ArgEx->getType(); 823 } 824 825 // Verify that the operand is valid. 826 if (CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, isSizeof)) 827 return true; 828 829 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 830 return new SizeOfAlignOfExpr(isSizeof, isType, TyOrEx, Context.getSizeType(), 831 OpLoc, Range.getEnd()); 832} 833 834QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 835 DefaultFunctionArrayConversion(V); 836 837 // These operators return the element type of a complex type. 838 if (const ComplexType *CT = V->getType()->getAsComplexType()) 839 return CT->getElementType(); 840 841 // Otherwise they pass through real integer and floating point types here. 842 if (V->getType()->isArithmeticType()) 843 return V->getType(); 844 845 // Reject anything else. 846 Diag(Loc, diag::err_realimag_invalid_type) << V->getType(); 847 return QualType(); 848} 849 850 851 852Action::ExprResult Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 853 tok::TokenKind Kind, 854 ExprTy *Input) { 855 Expr *Arg = (Expr *)Input; 856 857 UnaryOperator::Opcode Opc; 858 switch (Kind) { 859 default: assert(0 && "Unknown unary op!"); 860 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 861 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 862 } 863 864 if (getLangOptions().CPlusPlus && 865 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 866 // Which overloaded operator? 867 OverloadedOperatorKind OverOp = 868 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 869 870 // C++ [over.inc]p1: 871 // 872 // [...] If the function is a member function with one 873 // parameter (which shall be of type int) or a non-member 874 // function with two parameters (the second of which shall be 875 // of type int), it defines the postfix increment operator ++ 876 // for objects of that type. When the postfix increment is 877 // called as a result of using the ++ operator, the int 878 // argument will have value zero. 879 Expr *Args[2] = { 880 Arg, 881 new IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 882 /*isSigned=*/true), 883 Context.IntTy, SourceLocation()) 884 }; 885 886 // Build the candidate set for overloading 887 OverloadCandidateSet CandidateSet; 888 AddOperatorCandidates(OverOp, S, Args, 2, CandidateSet); 889 890 // Perform overload resolution. 891 OverloadCandidateSet::iterator Best; 892 switch (BestViableFunction(CandidateSet, Best)) { 893 case OR_Success: { 894 // We found a built-in operator or an overloaded operator. 895 FunctionDecl *FnDecl = Best->Function; 896 897 if (FnDecl) { 898 // We matched an overloaded operator. Build a call to that 899 // operator. 900 901 // Convert the arguments. 902 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 903 if (PerformObjectArgumentInitialization(Arg, Method)) 904 return true; 905 } else { 906 // Convert the arguments. 907 if (PerformCopyInitialization(Arg, 908 FnDecl->getParamDecl(0)->getType(), 909 "passing")) 910 return true; 911 } 912 913 // Determine the result type 914 QualType ResultTy 915 = FnDecl->getType()->getAsFunctionType()->getResultType(); 916 ResultTy = ResultTy.getNonReferenceType(); 917 918 // Build the actual expression node. 919 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 920 SourceLocation()); 921 UsualUnaryConversions(FnExpr); 922 923 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, OpLoc); 924 } else { 925 // We matched a built-in operator. Convert the arguments, then 926 // break out so that we will build the appropriate built-in 927 // operator node. 928 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 929 "passing")) 930 return true; 931 932 break; 933 } 934 } 935 936 case OR_No_Viable_Function: 937 // No viable function; fall through to handling this as a 938 // built-in operator, which will produce an error message for us. 939 break; 940 941 case OR_Ambiguous: 942 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 943 << UnaryOperator::getOpcodeStr(Opc) 944 << Arg->getSourceRange(); 945 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 946 return true; 947 } 948 949 // Either we found no viable overloaded operator or we matched a 950 // built-in operator. In either case, fall through to trying to 951 // build a built-in operation. 952 } 953 954 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc); 955 if (result.isNull()) 956 return true; 957 return new UnaryOperator(Arg, Opc, result, OpLoc); 958} 959 960Action::ExprResult Sema:: 961ActOnArraySubscriptExpr(Scope *S, ExprTy *Base, SourceLocation LLoc, 962 ExprTy *Idx, SourceLocation RLoc) { 963 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 964 965 if (getLangOptions().CPlusPlus && 966 (LHSExp->getType()->isRecordType() || 967 LHSExp->getType()->isEnumeralType() || 968 RHSExp->getType()->isRecordType() || 969 RHSExp->getType()->isEnumeralType())) { 970 // Add the appropriate overloaded operators (C++ [over.match.oper]) 971 // to the candidate set. 972 OverloadCandidateSet CandidateSet; 973 Expr *Args[2] = { LHSExp, RHSExp }; 974 AddOperatorCandidates(OO_Subscript, S, Args, 2, CandidateSet); 975 976 // Perform overload resolution. 977 OverloadCandidateSet::iterator Best; 978 switch (BestViableFunction(CandidateSet, Best)) { 979 case OR_Success: { 980 // We found a built-in operator or an overloaded operator. 981 FunctionDecl *FnDecl = Best->Function; 982 983 if (FnDecl) { 984 // We matched an overloaded operator. Build a call to that 985 // operator. 986 987 // Convert the arguments. 988 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 989 if (PerformObjectArgumentInitialization(LHSExp, Method) || 990 PerformCopyInitialization(RHSExp, 991 FnDecl->getParamDecl(0)->getType(), 992 "passing")) 993 return true; 994 } else { 995 // Convert the arguments. 996 if (PerformCopyInitialization(LHSExp, 997 FnDecl->getParamDecl(0)->getType(), 998 "passing") || 999 PerformCopyInitialization(RHSExp, 1000 FnDecl->getParamDecl(1)->getType(), 1001 "passing")) 1002 return true; 1003 } 1004 1005 // Determine the result type 1006 QualType ResultTy 1007 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1008 ResultTy = ResultTy.getNonReferenceType(); 1009 1010 // Build the actual expression node. 1011 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 1012 SourceLocation()); 1013 UsualUnaryConversions(FnExpr); 1014 1015 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, LLoc); 1016 } else { 1017 // We matched a built-in operator. Convert the arguments, then 1018 // break out so that we will build the appropriate built-in 1019 // operator node. 1020 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1021 "passing") || 1022 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1023 "passing")) 1024 return true; 1025 1026 break; 1027 } 1028 } 1029 1030 case OR_No_Viable_Function: 1031 // No viable function; fall through to handling this as a 1032 // built-in operator, which will produce an error message for us. 1033 break; 1034 1035 case OR_Ambiguous: 1036 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1037 << "[]" 1038 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1039 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1040 return true; 1041 } 1042 1043 // Either we found no viable overloaded operator or we matched a 1044 // built-in operator. In either case, fall through to trying to 1045 // build a built-in operation. 1046 } 1047 1048 // Perform default conversions. 1049 DefaultFunctionArrayConversion(LHSExp); 1050 DefaultFunctionArrayConversion(RHSExp); 1051 1052 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1053 1054 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1055 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1056 // in the subscript position. As a result, we need to derive the array base 1057 // and index from the expression types. 1058 Expr *BaseExpr, *IndexExpr; 1059 QualType ResultType; 1060 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1061 BaseExpr = LHSExp; 1062 IndexExpr = RHSExp; 1063 // FIXME: need to deal with const... 1064 ResultType = PTy->getPointeeType(); 1065 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1066 // Handle the uncommon case of "123[Ptr]". 1067 BaseExpr = RHSExp; 1068 IndexExpr = LHSExp; 1069 // FIXME: need to deal with const... 1070 ResultType = PTy->getPointeeType(); 1071 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1072 BaseExpr = LHSExp; // vectors: V[123] 1073 IndexExpr = RHSExp; 1074 1075 // Component access limited to variables (reject vec4.rg[1]). 1076 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1077 !isa<ExtVectorElementExpr>(BaseExpr)) 1078 return Diag(LLoc, diag::err_ext_vector_component_access) 1079 << SourceRange(LLoc, RLoc); 1080 // FIXME: need to deal with const... 1081 ResultType = VTy->getElementType(); 1082 } else { 1083 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value) 1084 << RHSExp->getSourceRange(); 1085 } 1086 // C99 6.5.2.1p1 1087 if (!IndexExpr->getType()->isIntegerType()) 1088 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript) 1089 << IndexExpr->getSourceRange(); 1090 1091 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 1092 // the following check catches trying to index a pointer to a function (e.g. 1093 // void (*)(int)) and pointers to incomplete types. Functions are not 1094 // objects in C99. 1095 if (!ResultType->isObjectType()) 1096 return Diag(BaseExpr->getLocStart(), 1097 diag::err_typecheck_subscript_not_object) 1098 << BaseExpr->getType() << BaseExpr->getSourceRange(); 1099 1100 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 1101} 1102 1103QualType Sema:: 1104CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1105 IdentifierInfo &CompName, SourceLocation CompLoc) { 1106 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1107 1108 // This flag determines whether or not the component is to be treated as a 1109 // special name, or a regular GLSL-style component access. 1110 bool SpecialComponent = false; 1111 1112 // The vector accessor can't exceed the number of elements. 1113 const char *compStr = CompName.getName(); 1114 if (strlen(compStr) > vecType->getNumElements()) { 1115 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1116 << baseType << SourceRange(CompLoc); 1117 return QualType(); 1118 } 1119 1120 // Check that we've found one of the special components, or that the component 1121 // names must come from the same set. 1122 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1123 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 1124 SpecialComponent = true; 1125 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1126 do 1127 compStr++; 1128 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1129 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 1130 do 1131 compStr++; 1132 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 1133 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 1134 do 1135 compStr++; 1136 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 1137 } 1138 1139 if (!SpecialComponent && *compStr) { 1140 // We didn't get to the end of the string. This means the component names 1141 // didn't come from the same set *or* we encountered an illegal name. 1142 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1143 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1144 return QualType(); 1145 } 1146 // Each component accessor can't exceed the vector type. 1147 compStr = CompName.getName(); 1148 while (*compStr) { 1149 if (vecType->isAccessorWithinNumElements(*compStr)) 1150 compStr++; 1151 else 1152 break; 1153 } 1154 if (!SpecialComponent && *compStr) { 1155 // We didn't get to the end of the string. This means a component accessor 1156 // exceeds the number of elements in the vector. 1157 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1158 << baseType << SourceRange(CompLoc); 1159 return QualType(); 1160 } 1161 1162 // If we have a special component name, verify that the current vector length 1163 // is an even number, since all special component names return exactly half 1164 // the elements. 1165 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 1166 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1167 << baseType << SourceRange(CompLoc); 1168 return QualType(); 1169 } 1170 1171 // The component accessor looks fine - now we need to compute the actual type. 1172 // The vector type is implied by the component accessor. For example, 1173 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1174 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1175 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 1176 : CompName.getLength(); 1177 if (CompSize == 1) 1178 return vecType->getElementType(); 1179 1180 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1181 // Now look up the TypeDefDecl from the vector type. Without this, 1182 // diagostics look bad. We want extended vector types to appear built-in. 1183 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1184 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1185 return Context.getTypedefType(ExtVectorDecls[i]); 1186 } 1187 return VT; // should never get here (a typedef type should always be found). 1188} 1189 1190/// constructSetterName - Return the setter name for the given 1191/// identifier, i.e. "set" + Name where the initial character of Name 1192/// has been capitalized. 1193// FIXME: Merge with same routine in Parser. But where should this 1194// live? 1195static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 1196 const IdentifierInfo *Name) { 1197 llvm::SmallString<100> SelectorName; 1198 SelectorName = "set"; 1199 SelectorName.append(Name->getName(), Name->getName()+Name->getLength()); 1200 SelectorName[3] = toupper(SelectorName[3]); 1201 return &Idents.get(&SelectorName[0], &SelectorName[SelectorName.size()]); 1202} 1203 1204Action::ExprResult Sema:: 1205ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 1206 tok::TokenKind OpKind, SourceLocation MemberLoc, 1207 IdentifierInfo &Member) { 1208 Expr *BaseExpr = static_cast<Expr *>(Base); 1209 assert(BaseExpr && "no record expression"); 1210 1211 // Perform default conversions. 1212 DefaultFunctionArrayConversion(BaseExpr); 1213 1214 QualType BaseType = BaseExpr->getType(); 1215 assert(!BaseType.isNull() && "no type for member expression"); 1216 1217 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1218 // must have pointer type, and the accessed type is the pointee. 1219 if (OpKind == tok::arrow) { 1220 if (const PointerType *PT = BaseType->getAsPointerType()) 1221 BaseType = PT->getPointeeType(); 1222 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1223 return BuildOverloadedArrowExpr(BaseExpr, OpLoc, MemberLoc, Member); 1224 else 1225 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow) 1226 << BaseType << BaseExpr->getSourceRange(); 1227 } 1228 1229 // Handle field access to simple records. This also handles access to fields 1230 // of the ObjC 'id' struct. 1231 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1232 RecordDecl *RDecl = RTy->getDecl(); 1233 if (RTy->isIncompleteType()) 1234 return Diag(OpLoc, diag::err_typecheck_incomplete_tag) 1235 << RDecl->getDeclName() << BaseExpr->getSourceRange(); 1236 // The record definition is complete, now make sure the member is valid. 1237 // FIXME: Qualified name lookup for C++ is a bit more complicated 1238 // than this. 1239 DeclContext::lookup_result Lookup = RDecl->lookup(Context, &Member); 1240 if (Lookup.first == Lookup.second) { 1241 return Diag(MemberLoc, diag::err_typecheck_no_member) 1242 << &Member << BaseExpr->getSourceRange(); 1243 } 1244 1245 FieldDecl *MemberDecl = dyn_cast<FieldDecl>(*Lookup.first); 1246 if (!MemberDecl) { 1247 unsigned DiagID = PP.getDiagnostics().getCustomDiagID(Diagnostic::Error, 1248 "Clang only supports references to members"); 1249 return Diag(MemberLoc, DiagID); 1250 } 1251 1252 // Figure out the type of the member; see C99 6.5.2.3p3 1253 // FIXME: Handle address space modifiers 1254 QualType MemberType = MemberDecl->getType(); 1255 unsigned combinedQualifiers = 1256 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1257 if (MemberDecl->isMutable()) 1258 combinedQualifiers &= ~QualType::Const; 1259 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1260 1261 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 1262 MemberLoc, MemberType); 1263 } 1264 1265 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1266 // (*Obj).ivar. 1267 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1268 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) { 1269 FieldDecl *FD = IFTy->getDecl()->lookupFieldDeclForIvar(Context, IV); 1270 return new ObjCIvarRefExpr(IV, FD, IV->getType(), MemberLoc, BaseExpr, 1271 OpKind == tok::arrow); 1272 } 1273 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1274 << IFTy->getDecl()->getDeclName() << &Member 1275 << BaseExpr->getSourceRange(); 1276 } 1277 1278 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1279 // pointer to a (potentially qualified) interface type. 1280 const PointerType *PTy; 1281 const ObjCInterfaceType *IFTy; 1282 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1283 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1284 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1285 1286 // Search for a declared property first. 1287 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 1288 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1289 1290 // Check protocols on qualified interfaces. 1291 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1292 E = IFTy->qual_end(); I != E; ++I) 1293 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1294 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1295 1296 // If that failed, look for an "implicit" property by seeing if the nullary 1297 // selector is implemented. 1298 1299 // FIXME: The logic for looking up nullary and unary selectors should be 1300 // shared with the code in ActOnInstanceMessage. 1301 1302 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1303 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1304 1305 // If this reference is in an @implementation, check for 'private' methods. 1306 if (!Getter) 1307 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1308 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1309 if (ObjCImplementationDecl *ImpDecl = 1310 ObjCImplementations[ClassDecl->getIdentifier()]) 1311 Getter = ImpDecl->getInstanceMethod(Sel); 1312 1313 // Look through local category implementations associated with the class. 1314 if (!Getter) { 1315 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1316 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1317 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1318 } 1319 } 1320 if (Getter) { 1321 // If we found a getter then this may be a valid dot-reference, we 1322 // will look for the matching setter, in case it is needed. 1323 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 1324 &Member); 1325 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 1326 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1327 if (!Setter) { 1328 // If this reference is in an @implementation, also check for 'private' 1329 // methods. 1330 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1331 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1332 if (ObjCImplementationDecl *ImpDecl = 1333 ObjCImplementations[ClassDecl->getIdentifier()]) 1334 Setter = ImpDecl->getInstanceMethod(SetterSel); 1335 } 1336 // Look through local category implementations associated with the class. 1337 if (!Setter) { 1338 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 1339 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1340 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 1341 } 1342 } 1343 1344 // FIXME: we must check that the setter has property type. 1345 return new ObjCKVCRefExpr(Getter, Getter->getResultType(), Setter, 1346 MemberLoc, BaseExpr); 1347 } 1348 } 1349 // Handle properties on qualified "id" protocols. 1350 const ObjCQualifiedIdType *QIdTy; 1351 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1352 // Check protocols on qualified interfaces. 1353 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1354 E = QIdTy->qual_end(); I != E; ++I) { 1355 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1356 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1357 // Also must look for a getter name which uses property syntax. 1358 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1359 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1360 return new ObjCMessageExpr(BaseExpr, Sel, OMD->getResultType(), OMD, 1361 OpLoc, MemberLoc, NULL, 0); 1362 } 1363 } 1364 } 1365 // Handle 'field access' to vectors, such as 'V.xx'. 1366 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1367 // Component access limited to variables (reject vec4.rg.g). 1368 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1369 !isa<ExtVectorElementExpr>(BaseExpr)) 1370 return Diag(MemberLoc, diag::err_ext_vector_component_access) 1371 << BaseExpr->getSourceRange(); 1372 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1373 if (ret.isNull()) 1374 return true; 1375 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1376 } 1377 1378 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 1379 << BaseType << BaseExpr->getSourceRange(); 1380} 1381 1382/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1383/// This provides the location of the left/right parens and a list of comma 1384/// locations. 1385Action::ExprResult Sema:: 1386ActOnCallExpr(Scope *S, ExprTy *fn, SourceLocation LParenLoc, 1387 ExprTy **args, unsigned NumArgs, 1388 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1389 Expr *Fn = static_cast<Expr *>(fn); 1390 Expr **Args = reinterpret_cast<Expr**>(args); 1391 assert(Fn && "no function call expression"); 1392 FunctionDecl *FDecl = NULL; 1393 OverloadedFunctionDecl *Ovl = NULL; 1394 1395 // Determine whether this is a dependent call inside a C++ template, 1396 // in which case we won't do any semantic analysis now. 1397 bool Dependent = false; 1398 if (Fn->isTypeDependent()) { 1399 if (CXXDependentNameExpr *FnName = dyn_cast<CXXDependentNameExpr>(Fn)) { 1400 if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 1401 Dependent = true; 1402 else { 1403 // Resolve the CXXDependentNameExpr to an actual identifier; 1404 // it wasn't really a dependent name after all. 1405 ExprResult Resolved 1406 = ActOnDeclarationNameExpr(S, FnName->getLocation(), FnName->getName(), 1407 /*HasTrailingLParen=*/true, 1408 /*SS=*/0, 1409 /*ForceResolution=*/true); 1410 if (Resolved.isInvalid) 1411 return true; 1412 else { 1413 delete Fn; 1414 Fn = (Expr *)Resolved.Val; 1415 } 1416 } 1417 } else 1418 Dependent = true; 1419 } else 1420 Dependent = Expr::hasAnyTypeDependentArguments(Args, NumArgs); 1421 1422 // FIXME: Will need to cache the results of name lookup (including 1423 // ADL) in Fn. 1424 if (Dependent) 1425 return new CallExpr(Fn, Args, NumArgs, Context.DependentTy, RParenLoc); 1426 1427 // If we're directly calling a function or a set of overloaded 1428 // functions, get the appropriate declaration. 1429 { 1430 DeclRefExpr *DRExpr = NULL; 1431 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1432 DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()); 1433 else 1434 DRExpr = dyn_cast<DeclRefExpr>(Fn); 1435 1436 if (DRExpr) { 1437 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1438 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1439 } 1440 } 1441 1442 if (Ovl) { 1443 FDecl = ResolveOverloadedCallFn(Fn, Ovl, LParenLoc, Args, NumArgs, CommaLocs, 1444 RParenLoc); 1445 if (!FDecl) 1446 return true; 1447 1448 // Update Fn to refer to the actual function selected. 1449 Expr *NewFn = new DeclRefExpr(FDecl, FDecl->getType(), 1450 Fn->getSourceRange().getBegin()); 1451 Fn->Destroy(Context); 1452 Fn = NewFn; 1453 } 1454 1455 if (getLangOptions().CPlusPlus && Fn->getType()->isRecordType()) 1456 return BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 1457 CommaLocs, RParenLoc); 1458 1459 // Promote the function operand. 1460 UsualUnaryConversions(Fn); 1461 1462 // Make the call expr early, before semantic checks. This guarantees cleanup 1463 // of arguments and function on error. 1464 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1465 Context.BoolTy, RParenLoc)); 1466 1467 const FunctionType *FuncT; 1468 if (!Fn->getType()->isBlockPointerType()) { 1469 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1470 // have type pointer to function". 1471 const PointerType *PT = Fn->getType()->getAsPointerType(); 1472 if (PT == 0) 1473 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1474 << Fn->getType() << Fn->getSourceRange(); 1475 FuncT = PT->getPointeeType()->getAsFunctionType(); 1476 } else { // This is a block call. 1477 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1478 getAsFunctionType(); 1479 } 1480 if (FuncT == 0) 1481 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1482 << Fn->getType() << Fn->getSourceRange(); 1483 1484 // We know the result type of the call, set it. 1485 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 1486 1487 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1488 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1489 // assignment, to the types of the corresponding parameter, ... 1490 unsigned NumArgsInProto = Proto->getNumArgs(); 1491 unsigned NumArgsToCheck = NumArgs; 1492 1493 // If too few arguments are available (and we don't have default 1494 // arguments for the remaining parameters), don't make the call. 1495 if (NumArgs < NumArgsInProto) { 1496 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 1497 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 1498 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 1499 // Use default arguments for missing arguments 1500 NumArgsToCheck = NumArgsInProto; 1501 TheCall->setNumArgs(NumArgsInProto); 1502 } 1503 1504 // If too many are passed and not variadic, error on the extras and drop 1505 // them. 1506 if (NumArgs > NumArgsInProto) { 1507 if (!Proto->isVariadic()) { 1508 Diag(Args[NumArgsInProto]->getLocStart(), 1509 diag::err_typecheck_call_too_many_args) 1510 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 1511 << SourceRange(Args[NumArgsInProto]->getLocStart(), 1512 Args[NumArgs-1]->getLocEnd()); 1513 // This deletes the extra arguments. 1514 TheCall->setNumArgs(NumArgsInProto); 1515 } 1516 NumArgsToCheck = NumArgsInProto; 1517 } 1518 1519 // Continue to check argument types (even if we have too few/many args). 1520 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1521 QualType ProtoArgType = Proto->getArgType(i); 1522 1523 Expr *Arg; 1524 if (i < NumArgs) 1525 Arg = Args[i]; 1526 else 1527 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1528 QualType ArgType = Arg->getType(); 1529 1530 // Pass the argument. 1531 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 1532 return true; 1533 1534 TheCall->setArg(i, Arg); 1535 } 1536 1537 // If this is a variadic call, handle args passed through "...". 1538 if (Proto->isVariadic()) { 1539 // Promote the arguments (C99 6.5.2.2p7). 1540 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1541 Expr *Arg = Args[i]; 1542 DefaultArgumentPromotion(Arg); 1543 TheCall->setArg(i, Arg); 1544 } 1545 } 1546 } else { 1547 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1548 1549 // Promote the arguments (C99 6.5.2.2p6). 1550 for (unsigned i = 0; i != NumArgs; i++) { 1551 Expr *Arg = Args[i]; 1552 DefaultArgumentPromotion(Arg); 1553 TheCall->setArg(i, Arg); 1554 } 1555 } 1556 1557 // Do special checking on direct calls to functions. 1558 if (FDecl) 1559 return CheckFunctionCall(FDecl, TheCall.take()); 1560 1561 return TheCall.take(); 1562} 1563 1564Action::ExprResult Sema:: 1565ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1566 SourceLocation RParenLoc, ExprTy *InitExpr) { 1567 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1568 QualType literalType = QualType::getFromOpaquePtr(Ty); 1569 // FIXME: put back this assert when initializers are worked out. 1570 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1571 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1572 1573 if (literalType->isArrayType()) { 1574 if (literalType->isVariableArrayType()) 1575 return Diag(LParenLoc, diag::err_variable_object_no_init) 1576 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1577 } else if (literalType->isIncompleteType()) { 1578 return Diag(LParenLoc, diag::err_typecheck_decl_incomplete_type) 1579 << literalType 1580 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1581 } 1582 1583 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 1584 DeclarationName())) 1585 return true; 1586 1587 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 1588 if (isFileScope) { // 6.5.2.5p3 1589 if (CheckForConstantInitializer(literalExpr, literalType)) 1590 return true; 1591 } 1592 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, 1593 isFileScope); 1594} 1595 1596Action::ExprResult Sema:: 1597ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1598 InitListDesignations &Designators, 1599 SourceLocation RBraceLoc) { 1600 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1601 1602 // Semantic analysis for initializers is done by ActOnDeclarator() and 1603 // CheckInitializer() - it requires knowledge of the object being intialized. 1604 1605 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc, 1606 Designators.hasAnyDesignators()); 1607 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1608 return E; 1609} 1610 1611/// CheckCastTypes - Check type constraints for casting between types. 1612bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1613 UsualUnaryConversions(castExpr); 1614 1615 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1616 // type needs to be scalar. 1617 if (castType->isVoidType()) { 1618 // Cast to void allows any expr type. 1619 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 1620 // We can't check any more until template instantiation time. 1621 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1622 // GCC struct/union extension: allow cast to self. 1623 if (Context.getCanonicalType(castType) != 1624 Context.getCanonicalType(castExpr->getType()) || 1625 (!castType->isStructureType() && !castType->isUnionType())) { 1626 // Reject any other conversions to non-scalar types. 1627 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 1628 << castType << castExpr->getSourceRange(); 1629 } 1630 1631 // accept this, but emit an ext-warn. 1632 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 1633 << castType << castExpr->getSourceRange(); 1634 } else if (!castExpr->getType()->isScalarType() && 1635 !castExpr->getType()->isVectorType()) { 1636 return Diag(castExpr->getLocStart(), 1637 diag::err_typecheck_expect_scalar_operand) 1638 << castExpr->getType() << castExpr->getSourceRange(); 1639 } else if (castExpr->getType()->isVectorType()) { 1640 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1641 return true; 1642 } else if (castType->isVectorType()) { 1643 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1644 return true; 1645 } 1646 return false; 1647} 1648 1649bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1650 assert(VectorTy->isVectorType() && "Not a vector type!"); 1651 1652 if (Ty->isVectorType() || Ty->isIntegerType()) { 1653 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1654 return Diag(R.getBegin(), 1655 Ty->isVectorType() ? 1656 diag::err_invalid_conversion_between_vectors : 1657 diag::err_invalid_conversion_between_vector_and_integer) 1658 << VectorTy << Ty << R; 1659 } else 1660 return Diag(R.getBegin(), 1661 diag::err_invalid_conversion_between_vector_and_scalar) 1662 << VectorTy << Ty << R; 1663 1664 return false; 1665} 1666 1667Action::ExprResult Sema:: 1668ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1669 SourceLocation RParenLoc, ExprTy *Op) { 1670 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1671 1672 Expr *castExpr = static_cast<Expr*>(Op); 1673 QualType castType = QualType::getFromOpaquePtr(Ty); 1674 1675 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1676 return true; 1677 return new CStyleCastExpr(castType, castExpr, castType, LParenLoc, RParenLoc); 1678} 1679 1680/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1681/// In that case, lex = cond. 1682inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1683 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1684 UsualUnaryConversions(cond); 1685 UsualUnaryConversions(lex); 1686 UsualUnaryConversions(rex); 1687 QualType condT = cond->getType(); 1688 QualType lexT = lex->getType(); 1689 QualType rexT = rex->getType(); 1690 1691 // first, check the condition. 1692 if (!cond->isTypeDependent()) { 1693 if (!condT->isScalarType()) { // C99 6.5.15p2 1694 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) << condT; 1695 return QualType(); 1696 } 1697 } 1698 1699 // Now check the two expressions. 1700 if ((lex && lex->isTypeDependent()) || (rex && rex->isTypeDependent())) 1701 return Context.DependentTy; 1702 1703 // If both operands have arithmetic type, do the usual arithmetic conversions 1704 // to find a common type: C99 6.5.15p3,5. 1705 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1706 UsualArithmeticConversions(lex, rex); 1707 return lex->getType(); 1708 } 1709 1710 // If both operands are the same structure or union type, the result is that 1711 // type. 1712 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1713 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1714 if (LHSRT->getDecl() == RHSRT->getDecl()) 1715 // "If both the operands have structure or union type, the result has 1716 // that type." This implies that CV qualifiers are dropped. 1717 return lexT.getUnqualifiedType(); 1718 } 1719 1720 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1721 // The following || allows only one side to be void (a GCC-ism). 1722 if (lexT->isVoidType() || rexT->isVoidType()) { 1723 if (!lexT->isVoidType()) 1724 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void) 1725 << rex->getSourceRange(); 1726 if (!rexT->isVoidType()) 1727 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void) 1728 << lex->getSourceRange(); 1729 ImpCastExprToType(lex, Context.VoidTy); 1730 ImpCastExprToType(rex, Context.VoidTy); 1731 return Context.VoidTy; 1732 } 1733 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1734 // the type of the other operand." 1735 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1736 Context.isObjCObjectPointerType(lexT)) && 1737 rex->isNullPointerConstant(Context)) { 1738 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1739 return lexT; 1740 } 1741 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1742 Context.isObjCObjectPointerType(rexT)) && 1743 lex->isNullPointerConstant(Context)) { 1744 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1745 return rexT; 1746 } 1747 // Handle the case where both operands are pointers before we handle null 1748 // pointer constants in case both operands are null pointer constants. 1749 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1750 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1751 // get the "pointed to" types 1752 QualType lhptee = LHSPT->getPointeeType(); 1753 QualType rhptee = RHSPT->getPointeeType(); 1754 1755 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1756 if (lhptee->isVoidType() && 1757 rhptee->isIncompleteOrObjectType()) { 1758 // Figure out necessary qualifiers (C99 6.5.15p6) 1759 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1760 QualType destType = Context.getPointerType(destPointee); 1761 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1762 ImpCastExprToType(rex, destType); // promote to void* 1763 return destType; 1764 } 1765 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1766 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1767 QualType destType = Context.getPointerType(destPointee); 1768 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1769 ImpCastExprToType(rex, destType); // promote to void* 1770 return destType; 1771 } 1772 1773 QualType compositeType = lexT; 1774 1775 // If either type is an Objective-C object type then check 1776 // compatibility according to Objective-C. 1777 if (Context.isObjCObjectPointerType(lexT) || 1778 Context.isObjCObjectPointerType(rexT)) { 1779 // If both operands are interfaces and either operand can be 1780 // assigned to the other, use that type as the composite 1781 // type. This allows 1782 // xxx ? (A*) a : (B*) b 1783 // where B is a subclass of A. 1784 // 1785 // Additionally, as for assignment, if either type is 'id' 1786 // allow silent coercion. Finally, if the types are 1787 // incompatible then make sure to use 'id' as the composite 1788 // type so the result is acceptable for sending messages to. 1789 1790 // FIXME: This code should not be localized to here. Also this 1791 // should use a compatible check instead of abusing the 1792 // canAssignObjCInterfaces code. 1793 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1794 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1795 if (LHSIface && RHSIface && 1796 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1797 compositeType = lexT; 1798 } else if (LHSIface && RHSIface && 1799 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 1800 compositeType = rexT; 1801 } else if (Context.isObjCIdType(lhptee) || 1802 Context.isObjCIdType(rhptee)) { 1803 // FIXME: This code looks wrong, because isObjCIdType checks 1804 // the struct but getObjCIdType returns the pointer to 1805 // struct. This is horrible and should be fixed. 1806 compositeType = Context.getObjCIdType(); 1807 } else { 1808 QualType incompatTy = Context.getObjCIdType(); 1809 ImpCastExprToType(lex, incompatTy); 1810 ImpCastExprToType(rex, incompatTy); 1811 return incompatTy; 1812 } 1813 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1814 rhptee.getUnqualifiedType())) { 1815 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers) 1816 << lexT << rexT << lex->getSourceRange() << rex->getSourceRange(); 1817 // In this situation, we assume void* type. No especially good 1818 // reason, but this is what gcc does, and we do have to pick 1819 // to get a consistent AST. 1820 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1821 ImpCastExprToType(lex, incompatTy); 1822 ImpCastExprToType(rex, incompatTy); 1823 return incompatTy; 1824 } 1825 // The pointer types are compatible. 1826 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1827 // differently qualified versions of compatible types, the result type is 1828 // a pointer to an appropriately qualified version of the *composite* 1829 // type. 1830 // FIXME: Need to calculate the composite type. 1831 // FIXME: Need to add qualifiers 1832 ImpCastExprToType(lex, compositeType); 1833 ImpCastExprToType(rex, compositeType); 1834 return compositeType; 1835 } 1836 } 1837 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1838 // evaluates to "struct objc_object *" (and is handled above when comparing 1839 // id with statically typed objects). 1840 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1841 // GCC allows qualified id and any Objective-C type to devolve to 1842 // id. Currently localizing to here until clear this should be 1843 // part of ObjCQualifiedIdTypesAreCompatible. 1844 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1845 (lexT->isObjCQualifiedIdType() && 1846 Context.isObjCObjectPointerType(rexT)) || 1847 (rexT->isObjCQualifiedIdType() && 1848 Context.isObjCObjectPointerType(lexT))) { 1849 // FIXME: This is not the correct composite type. This only 1850 // happens to work because id can more or less be used anywhere, 1851 // however this may change the type of method sends. 1852 // FIXME: gcc adds some type-checking of the arguments and emits 1853 // (confusing) incompatible comparison warnings in some 1854 // cases. Investigate. 1855 QualType compositeType = Context.getObjCIdType(); 1856 ImpCastExprToType(lex, compositeType); 1857 ImpCastExprToType(rex, compositeType); 1858 return compositeType; 1859 } 1860 } 1861 1862 // Selection between block pointer types is ok as long as they are the same. 1863 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1864 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1865 return lexT; 1866 1867 // Otherwise, the operands are not compatible. 1868 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands) 1869 << lexT << rexT << lex->getSourceRange() << rex->getSourceRange(); 1870 return QualType(); 1871} 1872 1873/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1874/// in the case of a the GNU conditional expr extension. 1875Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1876 SourceLocation ColonLoc, 1877 ExprTy *Cond, ExprTy *LHS, 1878 ExprTy *RHS) { 1879 Expr *CondExpr = (Expr *) Cond; 1880 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1881 1882 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1883 // was the condition. 1884 bool isLHSNull = LHSExpr == 0; 1885 if (isLHSNull) 1886 LHSExpr = CondExpr; 1887 1888 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1889 RHSExpr, QuestionLoc); 1890 if (result.isNull()) 1891 return true; 1892 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1893 RHSExpr, result); 1894} 1895 1896 1897// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1898// being closely modeled after the C99 spec:-). The odd characteristic of this 1899// routine is it effectively iqnores the qualifiers on the top level pointee. 1900// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1901// FIXME: add a couple examples in this comment. 1902Sema::AssignConvertType 1903Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1904 QualType lhptee, rhptee; 1905 1906 // get the "pointed to" type (ignoring qualifiers at the top level) 1907 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1908 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1909 1910 // make sure we operate on the canonical type 1911 lhptee = Context.getCanonicalType(lhptee); 1912 rhptee = Context.getCanonicalType(rhptee); 1913 1914 AssignConvertType ConvTy = Compatible; 1915 1916 // C99 6.5.16.1p1: This following citation is common to constraints 1917 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1918 // qualifiers of the type *pointed to* by the right; 1919 // FIXME: Handle ASQualType 1920 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 1921 ConvTy = CompatiblePointerDiscardsQualifiers; 1922 1923 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1924 // incomplete type and the other is a pointer to a qualified or unqualified 1925 // version of void... 1926 if (lhptee->isVoidType()) { 1927 if (rhptee->isIncompleteOrObjectType()) 1928 return ConvTy; 1929 1930 // As an extension, we allow cast to/from void* to function pointer. 1931 assert(rhptee->isFunctionType()); 1932 return FunctionVoidPointer; 1933 } 1934 1935 if (rhptee->isVoidType()) { 1936 if (lhptee->isIncompleteOrObjectType()) 1937 return ConvTy; 1938 1939 // As an extension, we allow cast to/from void* to function pointer. 1940 assert(lhptee->isFunctionType()); 1941 return FunctionVoidPointer; 1942 } 1943 1944 // Check for ObjC interfaces 1945 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1946 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1947 if (LHSIface && RHSIface && 1948 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1949 return ConvTy; 1950 1951 // ID acts sort of like void* for ObjC interfaces 1952 if (LHSIface && Context.isObjCIdType(rhptee)) 1953 return ConvTy; 1954 if (RHSIface && Context.isObjCIdType(lhptee)) 1955 return ConvTy; 1956 1957 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1958 // unqualified versions of compatible types, ... 1959 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1960 rhptee.getUnqualifiedType())) 1961 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1962 return ConvTy; 1963} 1964 1965/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1966/// block pointer types are compatible or whether a block and normal pointer 1967/// are compatible. It is more restrict than comparing two function pointer 1968// types. 1969Sema::AssignConvertType 1970Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1971 QualType rhsType) { 1972 QualType lhptee, rhptee; 1973 1974 // get the "pointed to" type (ignoring qualifiers at the top level) 1975 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1976 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1977 1978 // make sure we operate on the canonical type 1979 lhptee = Context.getCanonicalType(lhptee); 1980 rhptee = Context.getCanonicalType(rhptee); 1981 1982 AssignConvertType ConvTy = Compatible; 1983 1984 // For blocks we enforce that qualifiers are identical. 1985 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1986 ConvTy = CompatiblePointerDiscardsQualifiers; 1987 1988 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1989 return IncompatibleBlockPointer; 1990 return ConvTy; 1991} 1992 1993/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1994/// has code to accommodate several GCC extensions when type checking 1995/// pointers. Here are some objectionable examples that GCC considers warnings: 1996/// 1997/// int a, *pint; 1998/// short *pshort; 1999/// struct foo *pfoo; 2000/// 2001/// pint = pshort; // warning: assignment from incompatible pointer type 2002/// a = pint; // warning: assignment makes integer from pointer without a cast 2003/// pint = a; // warning: assignment makes pointer from integer without a cast 2004/// pint = pfoo; // warning: assignment from incompatible pointer type 2005/// 2006/// As a result, the code for dealing with pointers is more complex than the 2007/// C99 spec dictates. 2008/// 2009Sema::AssignConvertType 2010Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2011 // Get canonical types. We're not formatting these types, just comparing 2012 // them. 2013 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2014 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2015 2016 if (lhsType == rhsType) 2017 return Compatible; // Common case: fast path an exact match. 2018 2019 // If the left-hand side is a reference type, then we are in a 2020 // (rare!) case where we've allowed the use of references in C, 2021 // e.g., as a parameter type in a built-in function. In this case, 2022 // just make sure that the type referenced is compatible with the 2023 // right-hand side type. The caller is responsible for adjusting 2024 // lhsType so that the resulting expression does not have reference 2025 // type. 2026 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2027 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2028 return Compatible; 2029 return Incompatible; 2030 } 2031 2032 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 2033 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 2034 return Compatible; 2035 // Relax integer conversions like we do for pointers below. 2036 if (rhsType->isIntegerType()) 2037 return IntToPointer; 2038 if (lhsType->isIntegerType()) 2039 return PointerToInt; 2040 return IncompatibleObjCQualifiedId; 2041 } 2042 2043 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2044 // For ExtVector, allow vector splats; float -> <n x float> 2045 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2046 if (LV->getElementType() == rhsType) 2047 return Compatible; 2048 2049 // If we are allowing lax vector conversions, and LHS and RHS are both 2050 // vectors, the total size only needs to be the same. This is a bitcast; 2051 // no bits are changed but the result type is different. 2052 if (getLangOptions().LaxVectorConversions && 2053 lhsType->isVectorType() && rhsType->isVectorType()) { 2054 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2055 return Compatible; 2056 } 2057 return Incompatible; 2058 } 2059 2060 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2061 return Compatible; 2062 2063 if (isa<PointerType>(lhsType)) { 2064 if (rhsType->isIntegerType()) 2065 return IntToPointer; 2066 2067 if (isa<PointerType>(rhsType)) 2068 return CheckPointerTypesForAssignment(lhsType, rhsType); 2069 2070 if (rhsType->getAsBlockPointerType()) { 2071 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2072 return Compatible; 2073 2074 // Treat block pointers as objects. 2075 if (getLangOptions().ObjC1 && 2076 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2077 return Compatible; 2078 } 2079 return Incompatible; 2080 } 2081 2082 if (isa<BlockPointerType>(lhsType)) { 2083 if (rhsType->isIntegerType()) 2084 return IntToPointer; 2085 2086 // Treat block pointers as objects. 2087 if (getLangOptions().ObjC1 && 2088 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2089 return Compatible; 2090 2091 if (rhsType->isBlockPointerType()) 2092 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2093 2094 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2095 if (RHSPT->getPointeeType()->isVoidType()) 2096 return Compatible; 2097 } 2098 return Incompatible; 2099 } 2100 2101 if (isa<PointerType>(rhsType)) { 2102 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2103 if (lhsType == Context.BoolTy) 2104 return Compatible; 2105 2106 if (lhsType->isIntegerType()) 2107 return PointerToInt; 2108 2109 if (isa<PointerType>(lhsType)) 2110 return CheckPointerTypesForAssignment(lhsType, rhsType); 2111 2112 if (isa<BlockPointerType>(lhsType) && 2113 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2114 return Compatible; 2115 return Incompatible; 2116 } 2117 2118 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 2119 if (Context.typesAreCompatible(lhsType, rhsType)) 2120 return Compatible; 2121 } 2122 return Incompatible; 2123} 2124 2125Sema::AssignConvertType 2126Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2127 if (getLangOptions().CPlusPlus) { 2128 if (!lhsType->isRecordType()) { 2129 // C++ 5.17p3: If the left operand is not of class type, the 2130 // expression is implicitly converted (C++ 4) to the 2131 // cv-unqualified type of the left operand. 2132 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType())) 2133 return Incompatible; 2134 else 2135 return Compatible; 2136 } 2137 2138 // FIXME: Currently, we fall through and treat C++ classes like C 2139 // structures. 2140 } 2141 2142 // C99 6.5.16.1p1: the left operand is a pointer and the right is 2143 // a null pointer constant. 2144 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 2145 lhsType->isBlockPointerType()) 2146 && rExpr->isNullPointerConstant(Context)) { 2147 ImpCastExprToType(rExpr, lhsType); 2148 return Compatible; 2149 } 2150 2151 // We don't allow conversion of non-null-pointer constants to integers. 2152 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 2153 return IntToBlockPointer; 2154 2155 // This check seems unnatural, however it is necessary to ensure the proper 2156 // conversion of functions/arrays. If the conversion were done for all 2157 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 2158 // expressions that surpress this implicit conversion (&, sizeof). 2159 // 2160 // Suppress this for references: C++ 8.5.3p5. 2161 if (!lhsType->isReferenceType()) 2162 DefaultFunctionArrayConversion(rExpr); 2163 2164 Sema::AssignConvertType result = 2165 CheckAssignmentConstraints(lhsType, rExpr->getType()); 2166 2167 // C99 6.5.16.1p2: The value of the right operand is converted to the 2168 // type of the assignment expression. 2169 // CheckAssignmentConstraints allows the left-hand side to be a reference, 2170 // so that we can use references in built-in functions even in C. 2171 // The getNonReferenceType() call makes sure that the resulting expression 2172 // does not have reference type. 2173 if (rExpr->getType() != lhsType) 2174 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 2175 return result; 2176} 2177 2178Sema::AssignConvertType 2179Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 2180 return CheckAssignmentConstraints(lhsType, rhsType); 2181} 2182 2183QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 2184 Diag(Loc, diag::err_typecheck_invalid_operands) 2185 << lex->getType() << rex->getType() 2186 << lex->getSourceRange() << rex->getSourceRange(); 2187 return QualType(); 2188} 2189 2190inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 2191 Expr *&rex) { 2192 // For conversion purposes, we ignore any qualifiers. 2193 // For example, "const float" and "float" are equivalent. 2194 QualType lhsType = 2195 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 2196 QualType rhsType = 2197 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 2198 2199 // If the vector types are identical, return. 2200 if (lhsType == rhsType) 2201 return lhsType; 2202 2203 // Handle the case of a vector & extvector type of the same size and element 2204 // type. It would be nice if we only had one vector type someday. 2205 if (getLangOptions().LaxVectorConversions) 2206 if (const VectorType *LV = lhsType->getAsVectorType()) 2207 if (const VectorType *RV = rhsType->getAsVectorType()) 2208 if (LV->getElementType() == RV->getElementType() && 2209 LV->getNumElements() == RV->getNumElements()) 2210 return lhsType->isExtVectorType() ? lhsType : rhsType; 2211 2212 // If the lhs is an extended vector and the rhs is a scalar of the same type 2213 // or a literal, promote the rhs to the vector type. 2214 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 2215 QualType eltType = V->getElementType(); 2216 2217 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 2218 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 2219 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 2220 ImpCastExprToType(rex, lhsType); 2221 return lhsType; 2222 } 2223 } 2224 2225 // If the rhs is an extended vector and the lhs is a scalar of the same type, 2226 // promote the lhs to the vector type. 2227 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 2228 QualType eltType = V->getElementType(); 2229 2230 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 2231 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 2232 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 2233 ImpCastExprToType(lex, rhsType); 2234 return rhsType; 2235 } 2236 } 2237 2238 // You cannot convert between vector values of different size. 2239 Diag(Loc, diag::err_typecheck_vector_not_convertable) 2240 << lex->getType() << rex->getType() 2241 << lex->getSourceRange() << rex->getSourceRange(); 2242 return QualType(); 2243} 2244 2245inline QualType Sema::CheckMultiplyDivideOperands( 2246 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2247{ 2248 QualType lhsType = lex->getType(), rhsType = rex->getType(); 2249 2250 if (lhsType->isVectorType() || rhsType->isVectorType()) 2251 return CheckVectorOperands(Loc, lex, rex); 2252 2253 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2254 2255 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2256 return compType; 2257 return InvalidOperands(Loc, lex, rex); 2258} 2259 2260inline QualType Sema::CheckRemainderOperands( 2261 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2262{ 2263 QualType lhsType = lex->getType(), rhsType = rex->getType(); 2264 2265 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2266 2267 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2268 return compType; 2269 return InvalidOperands(Loc, lex, rex); 2270} 2271 2272inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 2273 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2274{ 2275 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2276 return CheckVectorOperands(Loc, lex, rex); 2277 2278 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2279 2280 // handle the common case first (both operands are arithmetic). 2281 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2282 return compType; 2283 2284 // Put any potential pointer into PExp 2285 Expr* PExp = lex, *IExp = rex; 2286 if (IExp->getType()->isPointerType()) 2287 std::swap(PExp, IExp); 2288 2289 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 2290 if (IExp->getType()->isIntegerType()) { 2291 // Check for arithmetic on pointers to incomplete types 2292 if (!PTy->getPointeeType()->isObjectType()) { 2293 if (PTy->getPointeeType()->isVoidType()) { 2294 Diag(Loc, diag::ext_gnu_void_ptr) 2295 << lex->getSourceRange() << rex->getSourceRange(); 2296 } else { 2297 Diag(Loc, diag::err_typecheck_arithmetic_incomplete_type) 2298 << lex->getType() << lex->getSourceRange(); 2299 return QualType(); 2300 } 2301 } 2302 return PExp->getType(); 2303 } 2304 } 2305 2306 return InvalidOperands(Loc, lex, rex); 2307} 2308 2309// C99 6.5.6 2310QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 2311 SourceLocation Loc, bool isCompAssign) { 2312 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2313 return CheckVectorOperands(Loc, lex, rex); 2314 2315 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2316 2317 // Enforce type constraints: C99 6.5.6p3. 2318 2319 // Handle the common case first (both operands are arithmetic). 2320 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2321 return compType; 2322 2323 // Either ptr - int or ptr - ptr. 2324 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 2325 QualType lpointee = LHSPTy->getPointeeType(); 2326 2327 // The LHS must be an object type, not incomplete, function, etc. 2328 if (!lpointee->isObjectType()) { 2329 // Handle the GNU void* extension. 2330 if (lpointee->isVoidType()) { 2331 Diag(Loc, diag::ext_gnu_void_ptr) 2332 << lex->getSourceRange() << rex->getSourceRange(); 2333 } else { 2334 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2335 << lex->getType() << lex->getSourceRange(); 2336 return QualType(); 2337 } 2338 } 2339 2340 // The result type of a pointer-int computation is the pointer type. 2341 if (rex->getType()->isIntegerType()) 2342 return lex->getType(); 2343 2344 // Handle pointer-pointer subtractions. 2345 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 2346 QualType rpointee = RHSPTy->getPointeeType(); 2347 2348 // RHS must be an object type, unless void (GNU). 2349 if (!rpointee->isObjectType()) { 2350 // Handle the GNU void* extension. 2351 if (rpointee->isVoidType()) { 2352 if (!lpointee->isVoidType()) 2353 Diag(Loc, diag::ext_gnu_void_ptr) 2354 << lex->getSourceRange() << rex->getSourceRange(); 2355 } else { 2356 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2357 << rex->getType() << rex->getSourceRange(); 2358 return QualType(); 2359 } 2360 } 2361 2362 // Pointee types must be compatible. 2363 if (!Context.typesAreCompatible( 2364 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2365 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2366 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 2367 << lex->getType() << rex->getType() 2368 << lex->getSourceRange() << rex->getSourceRange(); 2369 return QualType(); 2370 } 2371 2372 return Context.getPointerDiffType(); 2373 } 2374 } 2375 2376 return InvalidOperands(Loc, lex, rex); 2377} 2378 2379// C99 6.5.7 2380QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2381 bool isCompAssign) { 2382 // C99 6.5.7p2: Each of the operands shall have integer type. 2383 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2384 return InvalidOperands(Loc, lex, rex); 2385 2386 // Shifts don't perform usual arithmetic conversions, they just do integer 2387 // promotions on each operand. C99 6.5.7p3 2388 if (!isCompAssign) 2389 UsualUnaryConversions(lex); 2390 UsualUnaryConversions(rex); 2391 2392 // "The type of the result is that of the promoted left operand." 2393 return lex->getType(); 2394} 2395 2396static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 2397 ASTContext& Context) { 2398 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2399 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2400 // ID acts sort of like void* for ObjC interfaces 2401 if (LHSIface && Context.isObjCIdType(RHS)) 2402 return true; 2403 if (RHSIface && Context.isObjCIdType(LHS)) 2404 return true; 2405 if (!LHSIface || !RHSIface) 2406 return false; 2407 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 2408 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 2409} 2410 2411// C99 6.5.8 2412QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2413 bool isRelational) { 2414 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2415 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 2416 2417 // C99 6.5.8p3 / C99 6.5.9p4 2418 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2419 UsualArithmeticConversions(lex, rex); 2420 else { 2421 UsualUnaryConversions(lex); 2422 UsualUnaryConversions(rex); 2423 } 2424 QualType lType = lex->getType(); 2425 QualType rType = rex->getType(); 2426 2427 // For non-floating point types, check for self-comparisons of the form 2428 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2429 // often indicate logic errors in the program. 2430 if (!lType->isFloatingType()) { 2431 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2432 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2433 if (DRL->getDecl() == DRR->getDecl()) 2434 Diag(Loc, diag::warn_selfcomparison); 2435 } 2436 2437 // The result of comparisons is 'bool' in C++, 'int' in C. 2438 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy : Context.IntTy; 2439 2440 if (isRelational) { 2441 if (lType->isRealType() && rType->isRealType()) 2442 return ResultTy; 2443 } else { 2444 // Check for comparisons of floating point operands using != and ==. 2445 if (lType->isFloatingType()) { 2446 assert (rType->isFloatingType()); 2447 CheckFloatComparison(Loc,lex,rex); 2448 } 2449 2450 if (lType->isArithmeticType() && rType->isArithmeticType()) 2451 return ResultTy; 2452 } 2453 2454 bool LHSIsNull = lex->isNullPointerConstant(Context); 2455 bool RHSIsNull = rex->isNullPointerConstant(Context); 2456 2457 // All of the following pointer related warnings are GCC extensions, except 2458 // when handling null pointer constants. One day, we can consider making them 2459 // errors (when -pedantic-errors is enabled). 2460 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2461 QualType LCanPointeeTy = 2462 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2463 QualType RCanPointeeTy = 2464 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2465 2466 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2467 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2468 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2469 RCanPointeeTy.getUnqualifiedType()) && 2470 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2471 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2472 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2473 } 2474 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2475 return ResultTy; 2476 } 2477 // Handle block pointer types. 2478 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2479 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2480 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2481 2482 if (!LHSIsNull && !RHSIsNull && 2483 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2484 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2485 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2486 } 2487 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2488 return ResultTy; 2489 } 2490 // Allow block pointers to be compared with null pointer constants. 2491 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2492 (lType->isPointerType() && rType->isBlockPointerType())) { 2493 if (!LHSIsNull && !RHSIsNull) { 2494 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2495 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2496 } 2497 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2498 return ResultTy; 2499 } 2500 2501 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2502 if (lType->isPointerType() || rType->isPointerType()) { 2503 const PointerType *LPT = lType->getAsPointerType(); 2504 const PointerType *RPT = rType->getAsPointerType(); 2505 bool LPtrToVoid = LPT ? 2506 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 2507 bool RPtrToVoid = RPT ? 2508 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 2509 2510 if (!LPtrToVoid && !RPtrToVoid && 2511 !Context.typesAreCompatible(lType, rType)) { 2512 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2513 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2514 ImpCastExprToType(rex, lType); 2515 return ResultTy; 2516 } 2517 ImpCastExprToType(rex, lType); 2518 return ResultTy; 2519 } 2520 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2521 ImpCastExprToType(rex, lType); 2522 return ResultTy; 2523 } else { 2524 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2525 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 2526 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2527 ImpCastExprToType(rex, lType); 2528 return ResultTy; 2529 } 2530 } 2531 } 2532 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2533 rType->isIntegerType()) { 2534 if (!RHSIsNull) 2535 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2536 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2537 ImpCastExprToType(rex, lType); // promote the integer to pointer 2538 return ResultTy; 2539 } 2540 if (lType->isIntegerType() && 2541 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2542 if (!LHSIsNull) 2543 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2544 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2545 ImpCastExprToType(lex, rType); // promote the integer to pointer 2546 return ResultTy; 2547 } 2548 // Handle block pointers. 2549 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2550 if (!RHSIsNull) 2551 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2552 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2553 ImpCastExprToType(rex, lType); // promote the integer to pointer 2554 return ResultTy; 2555 } 2556 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2557 if (!LHSIsNull) 2558 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2559 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2560 ImpCastExprToType(lex, rType); // promote the integer to pointer 2561 return ResultTy; 2562 } 2563 return InvalidOperands(Loc, lex, rex); 2564} 2565 2566/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2567/// operates on extended vector types. Instead of producing an IntTy result, 2568/// like a scalar comparison, a vector comparison produces a vector of integer 2569/// types. 2570QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2571 SourceLocation Loc, 2572 bool isRelational) { 2573 // Check to make sure we're operating on vectors of the same type and width, 2574 // Allowing one side to be a scalar of element type. 2575 QualType vType = CheckVectorOperands(Loc, lex, rex); 2576 if (vType.isNull()) 2577 return vType; 2578 2579 QualType lType = lex->getType(); 2580 QualType rType = rex->getType(); 2581 2582 // For non-floating point types, check for self-comparisons of the form 2583 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2584 // often indicate logic errors in the program. 2585 if (!lType->isFloatingType()) { 2586 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2587 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2588 if (DRL->getDecl() == DRR->getDecl()) 2589 Diag(Loc, diag::warn_selfcomparison); 2590 } 2591 2592 // Check for comparisons of floating point operands using != and ==. 2593 if (!isRelational && lType->isFloatingType()) { 2594 assert (rType->isFloatingType()); 2595 CheckFloatComparison(Loc,lex,rex); 2596 } 2597 2598 // Return the type for the comparison, which is the same as vector type for 2599 // integer vectors, or an integer type of identical size and number of 2600 // elements for floating point vectors. 2601 if (lType->isIntegerType()) 2602 return lType; 2603 2604 const VectorType *VTy = lType->getAsVectorType(); 2605 2606 // FIXME: need to deal with non-32b int / non-64b long long 2607 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2608 if (TypeSize == 32) { 2609 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2610 } 2611 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2612 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2613} 2614 2615inline QualType Sema::CheckBitwiseOperands( 2616 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2617{ 2618 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2619 return CheckVectorOperands(Loc, lex, rex); 2620 2621 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2622 2623 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2624 return compType; 2625 return InvalidOperands(Loc, lex, rex); 2626} 2627 2628inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2629 Expr *&lex, Expr *&rex, SourceLocation Loc) 2630{ 2631 UsualUnaryConversions(lex); 2632 UsualUnaryConversions(rex); 2633 2634 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2635 return Context.IntTy; 2636 return InvalidOperands(Loc, lex, rex); 2637} 2638 2639/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 2640/// emit an error and return true. If so, return false. 2641static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 2642 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 2643 if (IsLV == Expr::MLV_Valid) 2644 return false; 2645 2646 unsigned Diag = 0; 2647 bool NeedType = false; 2648 switch (IsLV) { // C99 6.5.16p2 2649 default: assert(0 && "Unknown result from isModifiableLvalue!"); 2650 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 2651 case Expr::MLV_ArrayType: 2652 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 2653 NeedType = true; 2654 break; 2655 case Expr::MLV_NotObjectType: 2656 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 2657 NeedType = true; 2658 break; 2659 case Expr::MLV_LValueCast: 2660 Diag = diag::err_typecheck_lvalue_casts_not_supported; 2661 break; 2662 case Expr::MLV_InvalidExpression: 2663 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 2664 break; 2665 case Expr::MLV_IncompleteType: 2666 case Expr::MLV_IncompleteVoidType: 2667 Diag = diag::err_typecheck_incomplete_type_not_modifiable_lvalue; 2668 NeedType = true; 2669 break; 2670 case Expr::MLV_DuplicateVectorComponents: 2671 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 2672 break; 2673 case Expr::MLV_NotBlockQualified: 2674 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 2675 break; 2676 case Expr::MLV_ReadonlyProperty: 2677 Diag = diag::error_readonly_property_assignment; 2678 break; 2679 case Expr::MLV_NoSetterProperty: 2680 Diag = diag::error_nosetter_property_assignment; 2681 break; 2682 } 2683 2684 if (NeedType) 2685 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 2686 else 2687 S.Diag(Loc, Diag) << E->getSourceRange(); 2688 return true; 2689} 2690 2691 2692 2693// C99 6.5.16.1 2694QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 2695 SourceLocation Loc, 2696 QualType CompoundType) { 2697 // Verify that LHS is a modifiable lvalue, and emit error if not. 2698 if (CheckForModifiableLvalue(LHS, Loc, *this)) 2699 return QualType(); 2700 2701 QualType LHSType = LHS->getType(); 2702 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 2703 2704 AssignConvertType ConvTy; 2705 if (CompoundType.isNull()) { 2706 // Simple assignment "x = y". 2707 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 2708 2709 // If the RHS is a unary plus or minus, check to see if they = and + are 2710 // right next to each other. If so, the user may have typo'd "x =+ 4" 2711 // instead of "x += 4". 2712 Expr *RHSCheck = RHS; 2713 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2714 RHSCheck = ICE->getSubExpr(); 2715 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2716 if ((UO->getOpcode() == UnaryOperator::Plus || 2717 UO->getOpcode() == UnaryOperator::Minus) && 2718 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 2719 // Only if the two operators are exactly adjacent. 2720 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2721 Diag(Loc, diag::warn_not_compound_assign) 2722 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 2723 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 2724 } 2725 } else { 2726 // Compound assignment "x += y" 2727 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 2728 } 2729 2730 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 2731 RHS, "assigning")) 2732 return QualType(); 2733 2734 // C99 6.5.16p3: The type of an assignment expression is the type of the 2735 // left operand unless the left operand has qualified type, in which case 2736 // it is the unqualified version of the type of the left operand. 2737 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2738 // is converted to the type of the assignment expression (above). 2739 // C++ 5.17p1: the type of the assignment expression is that of its left 2740 // oprdu. 2741 return LHSType.getUnqualifiedType(); 2742} 2743 2744// C99 6.5.17 2745QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 2746 // FIXME: what is required for LHS? 2747 2748 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2749 DefaultFunctionArrayConversion(RHS); 2750 return RHS->getType(); 2751} 2752 2753/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2754/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2755QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc) { 2756 QualType ResType = Op->getType(); 2757 assert(!ResType.isNull() && "no type for increment/decrement expression"); 2758 2759 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2760 if (ResType->isRealType()) { 2761 // OK! 2762 } else if (const PointerType *PT = ResType->getAsPointerType()) { 2763 // C99 6.5.2.4p2, 6.5.6p2 2764 if (PT->getPointeeType()->isObjectType()) { 2765 // Pointer to object is ok! 2766 } else if (PT->getPointeeType()->isVoidType()) { 2767 // Pointer to void is extension. 2768 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 2769 } else { 2770 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type) 2771 << ResType << Op->getSourceRange(); 2772 return QualType(); 2773 } 2774 } else if (ResType->isComplexType()) { 2775 // C99 does not support ++/-- on complex types, we allow as an extension. 2776 Diag(OpLoc, diag::ext_integer_increment_complex) 2777 << ResType << Op->getSourceRange(); 2778 } else { 2779 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 2780 << ResType << Op->getSourceRange(); 2781 return QualType(); 2782 } 2783 // At this point, we know we have a real, complex or pointer type. 2784 // Now make sure the operand is a modifiable lvalue. 2785 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 2786 return QualType(); 2787 return ResType; 2788} 2789 2790/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2791/// This routine allows us to typecheck complex/recursive expressions 2792/// where the declaration is needed for type checking. We only need to 2793/// handle cases when the expression references a function designator 2794/// or is an lvalue. Here are some examples: 2795/// - &(x) => x 2796/// - &*****f => f for f a function designator. 2797/// - &s.xx => s 2798/// - &s.zz[1].yy -> s, if zz is an array 2799/// - *(x + 1) -> x, if x is an array 2800/// - &"123"[2] -> 0 2801/// - & __real__ x -> x 2802static NamedDecl *getPrimaryDecl(Expr *E) { 2803 switch (E->getStmtClass()) { 2804 case Stmt::DeclRefExprClass: 2805 return cast<DeclRefExpr>(E)->getDecl(); 2806 case Stmt::MemberExprClass: 2807 // Fields cannot be declared with a 'register' storage class. 2808 // &X->f is always ok, even if X is declared register. 2809 if (cast<MemberExpr>(E)->isArrow()) 2810 return 0; 2811 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2812 case Stmt::ArraySubscriptExprClass: { 2813 // &X[4] and &4[X] refers to X if X is not a pointer. 2814 2815 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2816 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 2817 if (!VD || VD->getType()->isPointerType()) 2818 return 0; 2819 else 2820 return VD; 2821 } 2822 case Stmt::UnaryOperatorClass: { 2823 UnaryOperator *UO = cast<UnaryOperator>(E); 2824 2825 switch(UO->getOpcode()) { 2826 case UnaryOperator::Deref: { 2827 // *(X + 1) refers to X if X is not a pointer. 2828 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 2829 ValueDecl *VD = dyn_cast<ValueDecl>(D); 2830 if (!VD || VD->getType()->isPointerType()) 2831 return 0; 2832 return VD; 2833 } 2834 return 0; 2835 } 2836 case UnaryOperator::Real: 2837 case UnaryOperator::Imag: 2838 case UnaryOperator::Extension: 2839 return getPrimaryDecl(UO->getSubExpr()); 2840 default: 2841 return 0; 2842 } 2843 } 2844 case Stmt::BinaryOperatorClass: { 2845 BinaryOperator *BO = cast<BinaryOperator>(E); 2846 2847 // Handle cases involving pointer arithmetic. The result of an 2848 // Assign or AddAssign is not an lvalue so they can be ignored. 2849 2850 // (x + n) or (n + x) => x 2851 if (BO->getOpcode() == BinaryOperator::Add) { 2852 if (BO->getLHS()->getType()->isPointerType()) { 2853 return getPrimaryDecl(BO->getLHS()); 2854 } else if (BO->getRHS()->getType()->isPointerType()) { 2855 return getPrimaryDecl(BO->getRHS()); 2856 } 2857 } 2858 2859 return 0; 2860 } 2861 case Stmt::ParenExprClass: 2862 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2863 case Stmt::ImplicitCastExprClass: 2864 // &X[4] when X is an array, has an implicit cast from array to pointer. 2865 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2866 default: 2867 return 0; 2868 } 2869} 2870 2871/// CheckAddressOfOperand - The operand of & must be either a function 2872/// designator or an lvalue designating an object. If it is an lvalue, the 2873/// object cannot be declared with storage class register or be a bit field. 2874/// Note: The usual conversions are *not* applied to the operand of the & 2875/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2876/// In C++, the operand might be an overloaded function name, in which case 2877/// we allow the '&' but retain the overloaded-function type. 2878QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2879 if (getLangOptions().C99) { 2880 // Implement C99-only parts of addressof rules. 2881 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2882 if (uOp->getOpcode() == UnaryOperator::Deref) 2883 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2884 // (assuming the deref expression is valid). 2885 return uOp->getSubExpr()->getType(); 2886 } 2887 // Technically, there should be a check for array subscript 2888 // expressions here, but the result of one is always an lvalue anyway. 2889 } 2890 NamedDecl *dcl = getPrimaryDecl(op); 2891 Expr::isLvalueResult lval = op->isLvalue(Context); 2892 2893 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2894 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2895 // FIXME: emit more specific diag... 2896 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 2897 << op->getSourceRange(); 2898 return QualType(); 2899 } 2900 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2901 if (MemExpr->getMemberDecl()->isBitField()) { 2902 Diag(OpLoc, diag::err_typecheck_address_of) 2903 << "bit-field" << op->getSourceRange(); 2904 return QualType(); 2905 } 2906 // Check for Apple extension for accessing vector components. 2907 } else if (isa<ArraySubscriptExpr>(op) && 2908 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2909 Diag(OpLoc, diag::err_typecheck_address_of) 2910 << "vector" << op->getSourceRange(); 2911 return QualType(); 2912 } else if (dcl) { // C99 6.5.3.2p1 2913 // We have an lvalue with a decl. Make sure the decl is not declared 2914 // with the register storage-class specifier. 2915 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2916 if (vd->getStorageClass() == VarDecl::Register) { 2917 Diag(OpLoc, diag::err_typecheck_address_of) 2918 << "register variable" << op->getSourceRange(); 2919 return QualType(); 2920 } 2921 } else if (isa<OverloadedFunctionDecl>(dcl)) { 2922 return Context.OverloadTy; 2923 } else if (isa<FieldDecl>(dcl)) { 2924 // Okay: we can take the address of a field. 2925 } else if (isa<FunctionDecl>(dcl)) { 2926 // Okay: we can take the address of a function. 2927 } 2928 else 2929 assert(0 && "Unknown/unexpected decl type"); 2930 } 2931 2932 // If the operand has type "type", the result has type "pointer to type". 2933 return Context.getPointerType(op->getType()); 2934} 2935 2936QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 2937 UsualUnaryConversions(Op); 2938 QualType Ty = Op->getType(); 2939 2940 // Note that per both C89 and C99, this is always legal, even if ptype is an 2941 // incomplete type or void. It would be possible to warn about dereferencing 2942 // a void pointer, but it's completely well-defined, and such a warning is 2943 // unlikely to catch any mistakes. 2944 if (const PointerType *PT = Ty->getAsPointerType()) 2945 return PT->getPointeeType(); 2946 2947 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 2948 << Ty << Op->getSourceRange(); 2949 return QualType(); 2950} 2951 2952static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2953 tok::TokenKind Kind) { 2954 BinaryOperator::Opcode Opc; 2955 switch (Kind) { 2956 default: assert(0 && "Unknown binop!"); 2957 case tok::star: Opc = BinaryOperator::Mul; break; 2958 case tok::slash: Opc = BinaryOperator::Div; break; 2959 case tok::percent: Opc = BinaryOperator::Rem; break; 2960 case tok::plus: Opc = BinaryOperator::Add; break; 2961 case tok::minus: Opc = BinaryOperator::Sub; break; 2962 case tok::lessless: Opc = BinaryOperator::Shl; break; 2963 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2964 case tok::lessequal: Opc = BinaryOperator::LE; break; 2965 case tok::less: Opc = BinaryOperator::LT; break; 2966 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2967 case tok::greater: Opc = BinaryOperator::GT; break; 2968 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2969 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2970 case tok::amp: Opc = BinaryOperator::And; break; 2971 case tok::caret: Opc = BinaryOperator::Xor; break; 2972 case tok::pipe: Opc = BinaryOperator::Or; break; 2973 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2974 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2975 case tok::equal: Opc = BinaryOperator::Assign; break; 2976 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2977 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2978 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2979 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2980 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2981 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2982 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2983 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2984 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2985 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2986 case tok::comma: Opc = BinaryOperator::Comma; break; 2987 } 2988 return Opc; 2989} 2990 2991static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2992 tok::TokenKind Kind) { 2993 UnaryOperator::Opcode Opc; 2994 switch (Kind) { 2995 default: assert(0 && "Unknown unary op!"); 2996 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2997 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2998 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2999 case tok::star: Opc = UnaryOperator::Deref; break; 3000 case tok::plus: Opc = UnaryOperator::Plus; break; 3001 case tok::minus: Opc = UnaryOperator::Minus; break; 3002 case tok::tilde: Opc = UnaryOperator::Not; break; 3003 case tok::exclaim: Opc = UnaryOperator::LNot; break; 3004 case tok::kw___real: Opc = UnaryOperator::Real; break; 3005 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 3006 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 3007 } 3008 return Opc; 3009} 3010 3011/// CreateBuiltinBinOp - Creates a new built-in binary operation with 3012/// operator @p Opc at location @c TokLoc. This routine only supports 3013/// built-in operations; ActOnBinOp handles overloaded operators. 3014Action::ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 3015 unsigned Op, 3016 Expr *lhs, Expr *rhs) { 3017 QualType ResultTy; // Result type of the binary operator. 3018 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 3019 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 3020 3021 switch (Opc) { 3022 default: 3023 assert(0 && "Unknown binary expr!"); 3024 case BinaryOperator::Assign: 3025 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 3026 break; 3027 case BinaryOperator::Mul: 3028 case BinaryOperator::Div: 3029 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 3030 break; 3031 case BinaryOperator::Rem: 3032 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 3033 break; 3034 case BinaryOperator::Add: 3035 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 3036 break; 3037 case BinaryOperator::Sub: 3038 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 3039 break; 3040 case BinaryOperator::Shl: 3041 case BinaryOperator::Shr: 3042 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 3043 break; 3044 case BinaryOperator::LE: 3045 case BinaryOperator::LT: 3046 case BinaryOperator::GE: 3047 case BinaryOperator::GT: 3048 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 3049 break; 3050 case BinaryOperator::EQ: 3051 case BinaryOperator::NE: 3052 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 3053 break; 3054 case BinaryOperator::And: 3055 case BinaryOperator::Xor: 3056 case BinaryOperator::Or: 3057 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 3058 break; 3059 case BinaryOperator::LAnd: 3060 case BinaryOperator::LOr: 3061 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 3062 break; 3063 case BinaryOperator::MulAssign: 3064 case BinaryOperator::DivAssign: 3065 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 3066 if (!CompTy.isNull()) 3067 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3068 break; 3069 case BinaryOperator::RemAssign: 3070 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 3071 if (!CompTy.isNull()) 3072 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3073 break; 3074 case BinaryOperator::AddAssign: 3075 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 3076 if (!CompTy.isNull()) 3077 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3078 break; 3079 case BinaryOperator::SubAssign: 3080 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 3081 if (!CompTy.isNull()) 3082 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3083 break; 3084 case BinaryOperator::ShlAssign: 3085 case BinaryOperator::ShrAssign: 3086 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 3087 if (!CompTy.isNull()) 3088 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3089 break; 3090 case BinaryOperator::AndAssign: 3091 case BinaryOperator::XorAssign: 3092 case BinaryOperator::OrAssign: 3093 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 3094 if (!CompTy.isNull()) 3095 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3096 break; 3097 case BinaryOperator::Comma: 3098 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 3099 break; 3100 } 3101 if (ResultTy.isNull()) 3102 return true; 3103 if (CompTy.isNull()) 3104 return new BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc); 3105 else 3106 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, OpLoc); 3107} 3108 3109// Binary Operators. 'Tok' is the token for the operator. 3110Action::ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 3111 tok::TokenKind Kind, 3112 ExprTy *LHS, ExprTy *RHS) { 3113 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 3114 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 3115 3116 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 3117 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 3118 3119 // If either expression is type-dependent, just build the AST. 3120 // FIXME: We'll need to perform some caching of the result of name 3121 // lookup for operator+. 3122 if (lhs->isTypeDependent() || rhs->isTypeDependent()) { 3123 if (Opc > BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) 3124 return new CompoundAssignOperator(lhs, rhs, Opc, Context.DependentTy, 3125 Context.DependentTy, TokLoc); 3126 else 3127 return new BinaryOperator(lhs, rhs, Opc, Context.DependentTy, TokLoc); 3128 } 3129 3130 if (getLangOptions().CPlusPlus && 3131 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 3132 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 3133 // If this is one of the assignment operators, we only perform 3134 // overload resolution if the left-hand side is a class or 3135 // enumeration type (C++ [expr.ass]p3). 3136 if (Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign && 3137 !(lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType())) { 3138 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3139 } 3140 3141 // Determine which overloaded operator we're dealing with. 3142 static const OverloadedOperatorKind OverOps[] = { 3143 OO_Star, OO_Slash, OO_Percent, 3144 OO_Plus, OO_Minus, 3145 OO_LessLess, OO_GreaterGreater, 3146 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 3147 OO_EqualEqual, OO_ExclaimEqual, 3148 OO_Amp, 3149 OO_Caret, 3150 OO_Pipe, 3151 OO_AmpAmp, 3152 OO_PipePipe, 3153 OO_Equal, OO_StarEqual, 3154 OO_SlashEqual, OO_PercentEqual, 3155 OO_PlusEqual, OO_MinusEqual, 3156 OO_LessLessEqual, OO_GreaterGreaterEqual, 3157 OO_AmpEqual, OO_CaretEqual, 3158 OO_PipeEqual, 3159 OO_Comma 3160 }; 3161 OverloadedOperatorKind OverOp = OverOps[Opc]; 3162 3163 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3164 // to the candidate set. 3165 OverloadCandidateSet CandidateSet; 3166 Expr *Args[2] = { lhs, rhs }; 3167 AddOperatorCandidates(OverOp, S, Args, 2, CandidateSet); 3168 3169 // Perform overload resolution. 3170 OverloadCandidateSet::iterator Best; 3171 switch (BestViableFunction(CandidateSet, Best)) { 3172 case OR_Success: { 3173 // We found a built-in operator or an overloaded operator. 3174 FunctionDecl *FnDecl = Best->Function; 3175 3176 if (FnDecl) { 3177 // We matched an overloaded operator. Build a call to that 3178 // operator. 3179 3180 // Convert the arguments. 3181 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3182 if (PerformObjectArgumentInitialization(lhs, Method) || 3183 PerformCopyInitialization(rhs, FnDecl->getParamDecl(0)->getType(), 3184 "passing")) 3185 return true; 3186 } else { 3187 // Convert the arguments. 3188 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 3189 "passing") || 3190 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 3191 "passing")) 3192 return true; 3193 } 3194 3195 // Determine the result type 3196 QualType ResultTy 3197 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3198 ResultTy = ResultTy.getNonReferenceType(); 3199 3200 // Build the actual expression node. 3201 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 3202 SourceLocation()); 3203 UsualUnaryConversions(FnExpr); 3204 3205 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, TokLoc); 3206 } else { 3207 // We matched a built-in operator. Convert the arguments, then 3208 // break out so that we will build the appropriate built-in 3209 // operator node. 3210 if (PerformCopyInitialization(lhs, Best->BuiltinTypes.ParamTypes[0], 3211 "passing") || 3212 PerformCopyInitialization(rhs, Best->BuiltinTypes.ParamTypes[1], 3213 "passing")) 3214 return true; 3215 3216 break; 3217 } 3218 } 3219 3220 case OR_No_Viable_Function: 3221 // No viable function; fall through to handling this as a 3222 // built-in operator, which will produce an error message for us. 3223 break; 3224 3225 case OR_Ambiguous: 3226 Diag(TokLoc, diag::err_ovl_ambiguous_oper) 3227 << BinaryOperator::getOpcodeStr(Opc) 3228 << lhs->getSourceRange() << rhs->getSourceRange(); 3229 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3230 return true; 3231 } 3232 3233 // Either we found no viable overloaded operator or we matched a 3234 // built-in operator. In either case, fall through to trying to 3235 // build a built-in operation. 3236 } 3237 3238 // Build a built-in binary operation. 3239 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3240} 3241 3242// Unary Operators. 'Tok' is the token for the operator. 3243Action::ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 3244 tok::TokenKind Op, ExprTy *input) { 3245 Expr *Input = (Expr*)input; 3246 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 3247 3248 if (getLangOptions().CPlusPlus && 3249 (Input->getType()->isRecordType() 3250 || Input->getType()->isEnumeralType())) { 3251 // Determine which overloaded operator we're dealing with. 3252 static const OverloadedOperatorKind OverOps[] = { 3253 OO_None, OO_None, 3254 OO_PlusPlus, OO_MinusMinus, 3255 OO_Amp, OO_Star, 3256 OO_Plus, OO_Minus, 3257 OO_Tilde, OO_Exclaim, 3258 OO_None, OO_None, 3259 OO_None, 3260 OO_None 3261 }; 3262 OverloadedOperatorKind OverOp = OverOps[Opc]; 3263 3264 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3265 // to the candidate set. 3266 OverloadCandidateSet CandidateSet; 3267 if (OverOp != OO_None) 3268 AddOperatorCandidates(OverOp, S, &Input, 1, CandidateSet); 3269 3270 // Perform overload resolution. 3271 OverloadCandidateSet::iterator Best; 3272 switch (BestViableFunction(CandidateSet, Best)) { 3273 case OR_Success: { 3274 // We found a built-in operator or an overloaded operator. 3275 FunctionDecl *FnDecl = Best->Function; 3276 3277 if (FnDecl) { 3278 // We matched an overloaded operator. Build a call to that 3279 // operator. 3280 3281 // Convert the arguments. 3282 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3283 if (PerformObjectArgumentInitialization(Input, Method)) 3284 return true; 3285 } else { 3286 // Convert the arguments. 3287 if (PerformCopyInitialization(Input, 3288 FnDecl->getParamDecl(0)->getType(), 3289 "passing")) 3290 return true; 3291 } 3292 3293 // Determine the result type 3294 QualType ResultTy 3295 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3296 ResultTy = ResultTy.getNonReferenceType(); 3297 3298 // Build the actual expression node. 3299 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 3300 SourceLocation()); 3301 UsualUnaryConversions(FnExpr); 3302 3303 return new CXXOperatorCallExpr(FnExpr, &Input, 1, ResultTy, OpLoc); 3304 } else { 3305 // We matched a built-in operator. Convert the arguments, then 3306 // break out so that we will build the appropriate built-in 3307 // operator node. 3308 if (PerformCopyInitialization(Input, Best->BuiltinTypes.ParamTypes[0], 3309 "passing")) 3310 return true; 3311 3312 break; 3313 } 3314 } 3315 3316 case OR_No_Viable_Function: 3317 // No viable function; fall through to handling this as a 3318 // built-in operator, which will produce an error message for us. 3319 break; 3320 3321 case OR_Ambiguous: 3322 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 3323 << UnaryOperator::getOpcodeStr(Opc) 3324 << Input->getSourceRange(); 3325 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3326 return true; 3327 } 3328 3329 // Either we found no viable overloaded operator or we matched a 3330 // built-in operator. In either case, fall through to trying to 3331 // build a built-in operation. 3332 } 3333 3334 QualType resultType; 3335 switch (Opc) { 3336 default: 3337 assert(0 && "Unimplemented unary expr!"); 3338 case UnaryOperator::PreInc: 3339 case UnaryOperator::PreDec: 3340 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 3341 break; 3342 case UnaryOperator::AddrOf: 3343 resultType = CheckAddressOfOperand(Input, OpLoc); 3344 break; 3345 case UnaryOperator::Deref: 3346 DefaultFunctionArrayConversion(Input); 3347 resultType = CheckIndirectionOperand(Input, OpLoc); 3348 break; 3349 case UnaryOperator::Plus: 3350 case UnaryOperator::Minus: 3351 UsualUnaryConversions(Input); 3352 resultType = Input->getType(); 3353 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 3354 break; 3355 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 3356 resultType->isEnumeralType()) 3357 break; 3358 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 3359 Opc == UnaryOperator::Plus && 3360 resultType->isPointerType()) 3361 break; 3362 3363 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3364 << resultType << Input->getSourceRange(); 3365 case UnaryOperator::Not: // bitwise complement 3366 UsualUnaryConversions(Input); 3367 resultType = Input->getType(); 3368 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 3369 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 3370 // C99 does not support '~' for complex conjugation. 3371 Diag(OpLoc, diag::ext_integer_complement_complex) 3372 << resultType << Input->getSourceRange(); 3373 else if (!resultType->isIntegerType()) 3374 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3375 << resultType << Input->getSourceRange(); 3376 break; 3377 case UnaryOperator::LNot: // logical negation 3378 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 3379 DefaultFunctionArrayConversion(Input); 3380 resultType = Input->getType(); 3381 if (!resultType->isScalarType()) // C99 6.5.3.3p1 3382 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3383 << resultType << Input->getSourceRange(); 3384 // LNot always has type int. C99 6.5.3.3p5. 3385 resultType = Context.IntTy; 3386 break; 3387 case UnaryOperator::Real: 3388 case UnaryOperator::Imag: 3389 resultType = CheckRealImagOperand(Input, OpLoc); 3390 break; 3391 case UnaryOperator::Extension: 3392 resultType = Input->getType(); 3393 break; 3394 } 3395 if (resultType.isNull()) 3396 return true; 3397 return new UnaryOperator(Input, Opc, resultType, OpLoc); 3398} 3399 3400/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 3401Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 3402 SourceLocation LabLoc, 3403 IdentifierInfo *LabelII) { 3404 // Look up the record for this label identifier. 3405 LabelStmt *&LabelDecl = LabelMap[LabelII]; 3406 3407 // If we haven't seen this label yet, create a forward reference. It 3408 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 3409 if (LabelDecl == 0) 3410 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 3411 3412 // Create the AST node. The address of a label always has type 'void*'. 3413 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 3414 Context.getPointerType(Context.VoidTy)); 3415} 3416 3417Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 3418 SourceLocation RPLoc) { // "({..})" 3419 Stmt *SubStmt = static_cast<Stmt*>(substmt); 3420 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 3421 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 3422 3423 // FIXME: there are a variety of strange constraints to enforce here, for 3424 // example, it is not possible to goto into a stmt expression apparently. 3425 // More semantic analysis is needed. 3426 3427 // FIXME: the last statement in the compount stmt has its value used. We 3428 // should not warn about it being unused. 3429 3430 // If there are sub stmts in the compound stmt, take the type of the last one 3431 // as the type of the stmtexpr. 3432 QualType Ty = Context.VoidTy; 3433 3434 if (!Compound->body_empty()) { 3435 Stmt *LastStmt = Compound->body_back(); 3436 // If LastStmt is a label, skip down through into the body. 3437 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 3438 LastStmt = Label->getSubStmt(); 3439 3440 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 3441 Ty = LastExpr->getType(); 3442 } 3443 3444 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 3445} 3446 3447Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 3448 SourceLocation TypeLoc, 3449 TypeTy *argty, 3450 OffsetOfComponent *CompPtr, 3451 unsigned NumComponents, 3452 SourceLocation RPLoc) { 3453 QualType ArgTy = QualType::getFromOpaquePtr(argty); 3454 assert(!ArgTy.isNull() && "Missing type argument!"); 3455 3456 // We must have at least one component that refers to the type, and the first 3457 // one is known to be a field designator. Verify that the ArgTy represents 3458 // a struct/union/class. 3459 if (!ArgTy->isRecordType()) 3460 return Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy; 3461 3462 // Otherwise, create a compound literal expression as the base, and 3463 // iteratively process the offsetof designators. 3464 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 3465 3466 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 3467 // GCC extension, diagnose them. 3468 if (NumComponents != 1) 3469 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 3470 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 3471 3472 for (unsigned i = 0; i != NumComponents; ++i) { 3473 const OffsetOfComponent &OC = CompPtr[i]; 3474 if (OC.isBrackets) { 3475 // Offset of an array sub-field. TODO: Should we allow vector elements? 3476 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 3477 if (!AT) { 3478 delete Res; 3479 return Diag(OC.LocEnd, diag::err_offsetof_array_type) << Res->getType(); 3480 } 3481 3482 // FIXME: C++: Verify that operator[] isn't overloaded. 3483 3484 // C99 6.5.2.1p1 3485 Expr *Idx = static_cast<Expr*>(OC.U.E); 3486 if (!Idx->getType()->isIntegerType()) 3487 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript) 3488 << Idx->getSourceRange(); 3489 3490 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 3491 continue; 3492 } 3493 3494 const RecordType *RC = Res->getType()->getAsRecordType(); 3495 if (!RC) { 3496 delete Res; 3497 return Diag(OC.LocEnd, diag::err_offsetof_record_type) << Res->getType(); 3498 } 3499 3500 // Get the decl corresponding to this. 3501 RecordDecl *RD = RC->getDecl(); 3502 FieldDecl *MemberDecl = 0; 3503 DeclContext::lookup_result Lookup = RD->lookup(Context, OC.U.IdentInfo); 3504 if (Lookup.first != Lookup.second) 3505 MemberDecl = dyn_cast<FieldDecl>(*Lookup.first); 3506 3507 if (!MemberDecl) 3508 return Diag(BuiltinLoc, diag::err_typecheck_no_member) 3509 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd); 3510 3511 // FIXME: C++: Verify that MemberDecl isn't a static field. 3512 // FIXME: Verify that MemberDecl isn't a bitfield. 3513 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 3514 // matter here. 3515 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, 3516 MemberDecl->getType().getNonReferenceType()); 3517 } 3518 3519 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 3520 BuiltinLoc); 3521} 3522 3523 3524Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 3525 TypeTy *arg1, TypeTy *arg2, 3526 SourceLocation RPLoc) { 3527 QualType argT1 = QualType::getFromOpaquePtr(arg1); 3528 QualType argT2 = QualType::getFromOpaquePtr(arg2); 3529 3530 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 3531 3532 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 3533} 3534 3535Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 3536 ExprTy *expr1, ExprTy *expr2, 3537 SourceLocation RPLoc) { 3538 Expr *CondExpr = static_cast<Expr*>(cond); 3539 Expr *LHSExpr = static_cast<Expr*>(expr1); 3540 Expr *RHSExpr = static_cast<Expr*>(expr2); 3541 3542 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 3543 3544 // The conditional expression is required to be a constant expression. 3545 llvm::APSInt condEval(32); 3546 SourceLocation ExpLoc; 3547 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 3548 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant) 3549 << CondExpr->getSourceRange(); 3550 3551 // If the condition is > zero, then the AST type is the same as the LSHExpr. 3552 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 3553 RHSExpr->getType(); 3554 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 3555} 3556 3557//===----------------------------------------------------------------------===// 3558// Clang Extensions. 3559//===----------------------------------------------------------------------===// 3560 3561/// ActOnBlockStart - This callback is invoked when a block literal is started. 3562void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 3563 // Analyze block parameters. 3564 BlockSemaInfo *BSI = new BlockSemaInfo(); 3565 3566 // Add BSI to CurBlock. 3567 BSI->PrevBlockInfo = CurBlock; 3568 CurBlock = BSI; 3569 3570 BSI->ReturnType = 0; 3571 BSI->TheScope = BlockScope; 3572 3573 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 3574 PushDeclContext(BlockScope, BSI->TheDecl); 3575} 3576 3577void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 3578 // Analyze arguments to block. 3579 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 3580 "Not a function declarator!"); 3581 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 3582 3583 CurBlock->hasPrototype = FTI.hasPrototype; 3584 CurBlock->isVariadic = true; 3585 3586 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 3587 // no arguments, not a function that takes a single void argument. 3588 if (FTI.hasPrototype && 3589 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3590 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 3591 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 3592 // empty arg list, don't push any params. 3593 CurBlock->isVariadic = false; 3594 } else if (FTI.hasPrototype) { 3595 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 3596 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 3597 CurBlock->isVariadic = FTI.isVariadic; 3598 } 3599 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 3600 3601 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 3602 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 3603 // If this has an identifier, add it to the scope stack. 3604 if ((*AI)->getIdentifier()) 3605 PushOnScopeChains(*AI, CurBlock->TheScope); 3606} 3607 3608/// ActOnBlockError - If there is an error parsing a block, this callback 3609/// is invoked to pop the information about the block from the action impl. 3610void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 3611 // Ensure that CurBlock is deleted. 3612 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 3613 3614 // Pop off CurBlock, handle nested blocks. 3615 CurBlock = CurBlock->PrevBlockInfo; 3616 3617 // FIXME: Delete the ParmVarDecl objects as well??? 3618 3619} 3620 3621/// ActOnBlockStmtExpr - This is called when the body of a block statement 3622/// literal was successfully completed. ^(int x){...} 3623Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 3624 Scope *CurScope) { 3625 // Ensure that CurBlock is deleted. 3626 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 3627 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 3628 3629 PopDeclContext(); 3630 3631 // Pop off CurBlock, handle nested blocks. 3632 CurBlock = CurBlock->PrevBlockInfo; 3633 3634 QualType RetTy = Context.VoidTy; 3635 if (BSI->ReturnType) 3636 RetTy = QualType(BSI->ReturnType, 0); 3637 3638 llvm::SmallVector<QualType, 8> ArgTypes; 3639 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 3640 ArgTypes.push_back(BSI->Params[i]->getType()); 3641 3642 QualType BlockTy; 3643 if (!BSI->hasPrototype) 3644 BlockTy = Context.getFunctionTypeNoProto(RetTy); 3645 else 3646 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 3647 BSI->isVariadic, 0); 3648 3649 BlockTy = Context.getBlockPointerType(BlockTy); 3650 3651 BSI->TheDecl->setBody(Body.take()); 3652 return new BlockExpr(BSI->TheDecl, BlockTy); 3653} 3654 3655/// ExprsMatchFnType - return true if the Exprs in array Args have 3656/// QualTypes that match the QualTypes of the arguments of the FnType. 3657/// The number of arguments has already been validated to match the number of 3658/// arguments in FnType. 3659static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 3660 ASTContext &Context) { 3661 unsigned NumParams = FnType->getNumArgs(); 3662 for (unsigned i = 0; i != NumParams; ++i) { 3663 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 3664 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 3665 3666 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 3667 return false; 3668 } 3669 return true; 3670} 3671 3672Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 3673 SourceLocation *CommaLocs, 3674 SourceLocation BuiltinLoc, 3675 SourceLocation RParenLoc) { 3676 // __builtin_overload requires at least 2 arguments 3677 if (NumArgs < 2) 3678 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 3679 << SourceRange(BuiltinLoc, RParenLoc); 3680 3681 // The first argument is required to be a constant expression. It tells us 3682 // the number of arguments to pass to each of the functions to be overloaded. 3683 Expr **Args = reinterpret_cast<Expr**>(args); 3684 Expr *NParamsExpr = Args[0]; 3685 llvm::APSInt constEval(32); 3686 SourceLocation ExpLoc; 3687 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 3688 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 3689 << NParamsExpr->getSourceRange(); 3690 3691 // Verify that the number of parameters is > 0 3692 unsigned NumParams = constEval.getZExtValue(); 3693 if (NumParams == 0) 3694 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 3695 << NParamsExpr->getSourceRange(); 3696 // Verify that we have at least 1 + NumParams arguments to the builtin. 3697 if ((NumParams + 1) > NumArgs) 3698 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 3699 << SourceRange(BuiltinLoc, RParenLoc); 3700 3701 // Figure out the return type, by matching the args to one of the functions 3702 // listed after the parameters. 3703 OverloadExpr *OE = 0; 3704 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 3705 // UsualUnaryConversions will convert the function DeclRefExpr into a 3706 // pointer to function. 3707 Expr *Fn = UsualUnaryConversions(Args[i]); 3708 const FunctionTypeProto *FnType = 0; 3709 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3710 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3711 3712 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3713 // parameters, and the number of parameters must match the value passed to 3714 // the builtin. 3715 if (!FnType || (FnType->getNumArgs() != NumParams)) 3716 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype) 3717 << Fn->getSourceRange(); 3718 3719 // Scan the parameter list for the FunctionType, checking the QualType of 3720 // each parameter against the QualTypes of the arguments to the builtin. 3721 // If they match, return a new OverloadExpr. 3722 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3723 if (OE) 3724 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match) 3725 << OE->getFn()->getSourceRange(); 3726 // Remember our match, and continue processing the remaining arguments 3727 // to catch any errors. 3728 OE = new OverloadExpr(Args, NumArgs, i, 3729 FnType->getResultType().getNonReferenceType(), 3730 BuiltinLoc, RParenLoc); 3731 } 3732 } 3733 // Return the newly created OverloadExpr node, if we succeded in matching 3734 // exactly one of the candidate functions. 3735 if (OE) 3736 return OE; 3737 3738 // If we didn't find a matching function Expr in the __builtin_overload list 3739 // the return an error. 3740 std::string typeNames; 3741 for (unsigned i = 0; i != NumParams; ++i) { 3742 if (i != 0) typeNames += ", "; 3743 typeNames += Args[i+1]->getType().getAsString(); 3744 } 3745 3746 return Diag(BuiltinLoc, diag::err_overload_no_match) 3747 << typeNames << SourceRange(BuiltinLoc, RParenLoc); 3748} 3749 3750Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3751 ExprTy *expr, TypeTy *type, 3752 SourceLocation RPLoc) { 3753 Expr *E = static_cast<Expr*>(expr); 3754 QualType T = QualType::getFromOpaquePtr(type); 3755 3756 InitBuiltinVaListType(); 3757 3758 // Get the va_list type 3759 QualType VaListType = Context.getBuiltinVaListType(); 3760 // Deal with implicit array decay; for example, on x86-64, 3761 // va_list is an array, but it's supposed to decay to 3762 // a pointer for va_arg. 3763 if (VaListType->isArrayType()) 3764 VaListType = Context.getArrayDecayedType(VaListType); 3765 // Make sure the input expression also decays appropriately. 3766 UsualUnaryConversions(E); 3767 3768 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3769 return Diag(E->getLocStart(), 3770 diag::err_first_argument_to_va_arg_not_of_type_va_list) 3771 << E->getType() << E->getSourceRange(); 3772 3773 // FIXME: Warn if a non-POD type is passed in. 3774 3775 return new VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 3776} 3777 3778Sema::ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 3779 // The type of __null will be int or long, depending on the size of 3780 // pointers on the target. 3781 QualType Ty; 3782 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 3783 Ty = Context.IntTy; 3784 else 3785 Ty = Context.LongTy; 3786 3787 return new GNUNullExpr(Ty, TokenLoc); 3788} 3789 3790bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3791 SourceLocation Loc, 3792 QualType DstType, QualType SrcType, 3793 Expr *SrcExpr, const char *Flavor) { 3794 // Decode the result (notice that AST's are still created for extensions). 3795 bool isInvalid = false; 3796 unsigned DiagKind; 3797 switch (ConvTy) { 3798 default: assert(0 && "Unknown conversion type"); 3799 case Compatible: return false; 3800 case PointerToInt: 3801 DiagKind = diag::ext_typecheck_convert_pointer_int; 3802 break; 3803 case IntToPointer: 3804 DiagKind = diag::ext_typecheck_convert_int_pointer; 3805 break; 3806 case IncompatiblePointer: 3807 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3808 break; 3809 case FunctionVoidPointer: 3810 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3811 break; 3812 case CompatiblePointerDiscardsQualifiers: 3813 // If the qualifiers lost were because we were applying the 3814 // (deprecated) C++ conversion from a string literal to a char* 3815 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3816 // Ideally, this check would be performed in 3817 // CheckPointerTypesForAssignment. However, that would require a 3818 // bit of refactoring (so that the second argument is an 3819 // expression, rather than a type), which should be done as part 3820 // of a larger effort to fix CheckPointerTypesForAssignment for 3821 // C++ semantics. 3822 if (getLangOptions().CPlusPlus && 3823 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3824 return false; 3825 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3826 break; 3827 case IntToBlockPointer: 3828 DiagKind = diag::err_int_to_block_pointer; 3829 break; 3830 case IncompatibleBlockPointer: 3831 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3832 break; 3833 case IncompatibleObjCQualifiedId: 3834 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3835 // it can give a more specific diagnostic. 3836 DiagKind = diag::warn_incompatible_qualified_id; 3837 break; 3838 case Incompatible: 3839 DiagKind = diag::err_typecheck_convert_incompatible; 3840 isInvalid = true; 3841 break; 3842 } 3843 3844 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 3845 << SrcExpr->getSourceRange(); 3846 return isInvalid; 3847} 3848 3849bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 3850{ 3851 Expr::EvalResult EvalResult; 3852 3853 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 3854 EvalResult.HasSideEffects) { 3855 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 3856 3857 if (EvalResult.Diag) { 3858 // We only show the note if it's not the usual "invalid subexpression" 3859 // or if it's actually in a subexpression. 3860 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 3861 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 3862 Diag(EvalResult.DiagLoc, EvalResult.Diag); 3863 } 3864 3865 return true; 3866 } 3867 3868 if (EvalResult.Diag) { 3869 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 3870 E->getSourceRange(); 3871 3872 // Print the reason it's not a constant. 3873 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 3874 Diag(EvalResult.DiagLoc, EvalResult.Diag); 3875 } 3876 3877 if (Result) 3878 *Result = EvalResult.Val.getInt(); 3879 return false; 3880} 3881