SemaExpr.cpp revision 3257fb58ef6583ce20036c77a8c5af95f158f2d3
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/Lex/Preprocessor.h" 20#include "clang/Lex/LiteralSupport.h" 21#include "clang/Basic/Diagnostic.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29//===----------------------------------------------------------------------===// 30// Standard Promotions and Conversions 31//===----------------------------------------------------------------------===// 32 33/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 34void Sema::DefaultFunctionArrayConversion(Expr *&E) { 35 QualType Ty = E->getType(); 36 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 37 38 if (Ty->isFunctionType()) 39 ImpCastExprToType(E, Context.getPointerType(Ty)); 40 else if (Ty->isArrayType()) { 41 // In C90 mode, arrays only promote to pointers if the array expression is 42 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 43 // type 'array of type' is converted to an expression that has type 'pointer 44 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 45 // that has type 'array of type' ...". The relevant change is "an lvalue" 46 // (C90) to "an expression" (C99). 47 // 48 // C++ 4.2p1: 49 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 50 // T" can be converted to an rvalue of type "pointer to T". 51 // 52 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 53 E->isLvalue(Context) == Expr::LV_Valid) 54 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 55 } 56} 57 58/// UsualUnaryConversions - Performs various conversions that are common to most 59/// operators (C99 6.3). The conversions of array and function types are 60/// sometimes surpressed. For example, the array->pointer conversion doesn't 61/// apply if the array is an argument to the sizeof or address (&) operators. 62/// In these instances, this routine should *not* be called. 63Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 64 QualType Ty = Expr->getType(); 65 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 66 67 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 68 ImpCastExprToType(Expr, Context.IntTy); 69 else 70 DefaultFunctionArrayConversion(Expr); 71 72 return Expr; 73} 74 75/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 76/// do not have a prototype. Arguments that have type float are promoted to 77/// double. All other argument types are converted by UsualUnaryConversions(). 78void Sema::DefaultArgumentPromotion(Expr *&Expr) { 79 QualType Ty = Expr->getType(); 80 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 81 82 // If this is a 'float' (CVR qualified or typedef) promote to double. 83 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 84 if (BT->getKind() == BuiltinType::Float) 85 return ImpCastExprToType(Expr, Context.DoubleTy); 86 87 UsualUnaryConversions(Expr); 88} 89 90/// UsualArithmeticConversions - Performs various conversions that are common to 91/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 92/// routine returns the first non-arithmetic type found. The client is 93/// responsible for emitting appropriate error diagnostics. 94/// FIXME: verify the conversion rules for "complex int" are consistent with 95/// GCC. 96QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 97 bool isCompAssign) { 98 if (!isCompAssign) { 99 UsualUnaryConversions(lhsExpr); 100 UsualUnaryConversions(rhsExpr); 101 } 102 103 // For conversion purposes, we ignore any qualifiers. 104 // For example, "const float" and "float" are equivalent. 105 QualType lhs = 106 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 107 QualType rhs = 108 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 109 110 // If both types are identical, no conversion is needed. 111 if (lhs == rhs) 112 return lhs; 113 114 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 115 // The caller can deal with this (e.g. pointer + int). 116 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 117 return lhs; 118 119 QualType destType = UsualArithmeticConversionsType(lhs, rhs); 120 if (!isCompAssign) { 121 ImpCastExprToType(lhsExpr, destType); 122 ImpCastExprToType(rhsExpr, destType); 123 } 124 return destType; 125} 126 127QualType Sema::UsualArithmeticConversionsType(QualType lhs, QualType rhs) { 128 // Perform the usual unary conversions. We do this early so that 129 // integral promotions to "int" can allow us to exit early, in the 130 // lhs == rhs check. Also, for conversion purposes, we ignore any 131 // qualifiers. For example, "const float" and "float" are 132 // equivalent. 133 if (lhs->isPromotableIntegerType()) lhs = Context.IntTy; 134 else lhs = lhs.getUnqualifiedType(); 135 if (rhs->isPromotableIntegerType()) rhs = Context.IntTy; 136 else rhs = rhs.getUnqualifiedType(); 137 138 // If both types are identical, no conversion is needed. 139 if (lhs == rhs) 140 return lhs; 141 142 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 143 // The caller can deal with this (e.g. pointer + int). 144 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 145 return lhs; 146 147 // At this point, we have two different arithmetic types. 148 149 // Handle complex types first (C99 6.3.1.8p1). 150 if (lhs->isComplexType() || rhs->isComplexType()) { 151 // if we have an integer operand, the result is the complex type. 152 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 153 // convert the rhs to the lhs complex type. 154 return lhs; 155 } 156 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 157 // convert the lhs to the rhs complex type. 158 return rhs; 159 } 160 // This handles complex/complex, complex/float, or float/complex. 161 // When both operands are complex, the shorter operand is converted to the 162 // type of the longer, and that is the type of the result. This corresponds 163 // to what is done when combining two real floating-point operands. 164 // The fun begins when size promotion occur across type domains. 165 // From H&S 6.3.4: When one operand is complex and the other is a real 166 // floating-point type, the less precise type is converted, within it's 167 // real or complex domain, to the precision of the other type. For example, 168 // when combining a "long double" with a "double _Complex", the 169 // "double _Complex" is promoted to "long double _Complex". 170 int result = Context.getFloatingTypeOrder(lhs, rhs); 171 172 if (result > 0) { // The left side is bigger, convert rhs. 173 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 174 } else if (result < 0) { // The right side is bigger, convert lhs. 175 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 176 } 177 // At this point, lhs and rhs have the same rank/size. Now, make sure the 178 // domains match. This is a requirement for our implementation, C99 179 // does not require this promotion. 180 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 181 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 182 return rhs; 183 } else { // handle "_Complex double, double". 184 return lhs; 185 } 186 } 187 return lhs; // The domain/size match exactly. 188 } 189 // Now handle "real" floating types (i.e. float, double, long double). 190 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 191 // if we have an integer operand, the result is the real floating type. 192 if (rhs->isIntegerType()) { 193 // convert rhs to the lhs floating point type. 194 return lhs; 195 } 196 if (rhs->isComplexIntegerType()) { 197 // convert rhs to the complex floating point type. 198 return Context.getComplexType(lhs); 199 } 200 if (lhs->isIntegerType()) { 201 // convert lhs to the rhs floating point type. 202 return rhs; 203 } 204 if (lhs->isComplexIntegerType()) { 205 // convert lhs to the complex floating point type. 206 return Context.getComplexType(rhs); 207 } 208 // We have two real floating types, float/complex combos were handled above. 209 // Convert the smaller operand to the bigger result. 210 int result = Context.getFloatingTypeOrder(lhs, rhs); 211 212 if (result > 0) { // convert the rhs 213 return lhs; 214 } 215 if (result < 0) { // convert the lhs 216 return rhs; 217 } 218 assert(0 && "Sema::UsualArithmeticConversionsType(): illegal float comparison"); 219 } 220 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 221 // Handle GCC complex int extension. 222 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 223 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 224 225 if (lhsComplexInt && rhsComplexInt) { 226 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 227 rhsComplexInt->getElementType()) >= 0) { 228 // convert the rhs 229 return lhs; 230 } 231 return rhs; 232 } else if (lhsComplexInt && rhs->isIntegerType()) { 233 // convert the rhs to the lhs complex type. 234 return lhs; 235 } else if (rhsComplexInt && lhs->isIntegerType()) { 236 // convert the lhs to the rhs complex type. 237 return rhs; 238 } 239 } 240 // Finally, we have two differing integer types. 241 // The rules for this case are in C99 6.3.1.8 242 int compare = Context.getIntegerTypeOrder(lhs, rhs); 243 bool lhsSigned = lhs->isSignedIntegerType(), 244 rhsSigned = rhs->isSignedIntegerType(); 245 QualType destType; 246 if (lhsSigned == rhsSigned) { 247 // Same signedness; use the higher-ranked type 248 destType = compare >= 0 ? lhs : rhs; 249 } else if (compare != (lhsSigned ? 1 : -1)) { 250 // The unsigned type has greater than or equal rank to the 251 // signed type, so use the unsigned type 252 destType = lhsSigned ? rhs : lhs; 253 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 254 // The two types are different widths; if we are here, that 255 // means the signed type is larger than the unsigned type, so 256 // use the signed type. 257 destType = lhsSigned ? lhs : rhs; 258 } else { 259 // The signed type is higher-ranked than the unsigned type, 260 // but isn't actually any bigger (like unsigned int and long 261 // on most 32-bit systems). Use the unsigned type corresponding 262 // to the signed type. 263 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 264 } 265 return destType; 266} 267 268//===----------------------------------------------------------------------===// 269// Semantic Analysis for various Expression Types 270//===----------------------------------------------------------------------===// 271 272 273/// ActOnStringLiteral - The specified tokens were lexed as pasted string 274/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 275/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 276/// multiple tokens. However, the common case is that StringToks points to one 277/// string. 278/// 279Action::ExprResult 280Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 281 assert(NumStringToks && "Must have at least one string!"); 282 283 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 284 if (Literal.hadError) 285 return ExprResult(true); 286 287 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 288 for (unsigned i = 0; i != NumStringToks; ++i) 289 StringTokLocs.push_back(StringToks[i].getLocation()); 290 291 // Verify that pascal strings aren't too large. 292 if (Literal.Pascal && Literal.GetStringLength() > 256) 293 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long) 294 << SourceRange(StringToks[0].getLocation(), 295 StringToks[NumStringToks-1].getLocation()); 296 297 QualType StrTy = Context.CharTy; 298 if (Literal.AnyWide) StrTy = Context.getWCharType(); 299 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 300 301 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 302 if (getLangOptions().CPlusPlus) 303 StrTy.addConst(); 304 305 // Get an array type for the string, according to C99 6.4.5. This includes 306 // the nul terminator character as well as the string length for pascal 307 // strings. 308 StrTy = Context.getConstantArrayType(StrTy, 309 llvm::APInt(32, Literal.GetStringLength()+1), 310 ArrayType::Normal, 0); 311 312 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 313 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 314 Literal.AnyWide, StrTy, 315 StringToks[0].getLocation(), 316 StringToks[NumStringToks-1].getLocation()); 317} 318 319/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 320/// CurBlock to VD should cause it to be snapshotted (as we do for auto 321/// variables defined outside the block) or false if this is not needed (e.g. 322/// for values inside the block or for globals). 323/// 324/// FIXME: This will create BlockDeclRefExprs for global variables, 325/// function references, etc which is suboptimal :) and breaks 326/// things like "integer constant expression" tests. 327static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 328 ValueDecl *VD) { 329 // If the value is defined inside the block, we couldn't snapshot it even if 330 // we wanted to. 331 if (CurBlock->TheDecl == VD->getDeclContext()) 332 return false; 333 334 // If this is an enum constant or function, it is constant, don't snapshot. 335 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 336 return false; 337 338 // If this is a reference to an extern, static, or global variable, no need to 339 // snapshot it. 340 // FIXME: What about 'const' variables in C++? 341 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 342 return Var->hasLocalStorage(); 343 344 return true; 345} 346 347 348 349/// ActOnIdentifierExpr - The parser read an identifier in expression context, 350/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 351/// identifier is used in a function call context. 352/// LookupCtx is only used for a C++ qualified-id (foo::bar) to indicate the 353/// class or namespace that the identifier must be a member of. 354Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 355 IdentifierInfo &II, 356 bool HasTrailingLParen, 357 const CXXScopeSpec *SS) { 358 return ActOnDeclarationNameExpr(S, Loc, &II, HasTrailingLParen, SS); 359} 360 361/// ActOnDeclarationNameExpr - The parser has read some kind of name 362/// (e.g., a C++ id-expression (C++ [expr.prim]p1)). This routine 363/// performs lookup on that name and returns an expression that refers 364/// to that name. This routine isn't directly called from the parser, 365/// because the parser doesn't know about DeclarationName. Rather, 366/// this routine is called by ActOnIdentifierExpr, 367/// ActOnOperatorFunctionIdExpr, and ActOnConversionFunctionExpr, 368/// which form the DeclarationName from the corresponding syntactic 369/// forms. 370/// 371/// HasTrailingLParen indicates whether this identifier is used in a 372/// function call context. LookupCtx is only used for a C++ 373/// qualified-id (foo::bar) to indicate the class or namespace that 374/// the identifier must be a member of. 375/// 376/// If ForceResolution is true, then we will attempt to resolve the 377/// name even if it looks like a dependent name. This option is off by 378/// default. 379Sema::ExprResult Sema::ActOnDeclarationNameExpr(Scope *S, SourceLocation Loc, 380 DeclarationName Name, 381 bool HasTrailingLParen, 382 const CXXScopeSpec *SS, 383 bool ForceResolution) { 384 if (S->getTemplateParamParent() && Name.getAsIdentifierInfo() && 385 HasTrailingLParen && !SS && !ForceResolution) { 386 // We've seen something of the form 387 // identifier( 388 // and we are in a template, so it is likely that 's' is a 389 // dependent name. However, we won't know until we've parsed all 390 // of the call arguments. So, build a CXXDependentNameExpr node 391 // to represent this name. Then, if it turns out that none of the 392 // arguments are type-dependent, we'll force the resolution of the 393 // dependent name at that point. 394 return new CXXDependentNameExpr(Name.getAsIdentifierInfo(), 395 Context.DependentTy, Loc); 396 } 397 398 // Could be enum-constant, value decl, instance variable, etc. 399 Decl *D; 400 if (SS && !SS->isEmpty()) { 401 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 402 if (DC == 0) 403 return true; 404 D = LookupDecl(Name, Decl::IDNS_Ordinary, S, DC); 405 } else 406 D = LookupDecl(Name, Decl::IDNS_Ordinary, S); 407 408 // If this reference is in an Objective-C method, then ivar lookup happens as 409 // well. 410 IdentifierInfo *II = Name.getAsIdentifierInfo(); 411 if (II && getCurMethodDecl()) { 412 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 413 // There are two cases to handle here. 1) scoped lookup could have failed, 414 // in which case we should look for an ivar. 2) scoped lookup could have 415 // found a decl, but that decl is outside the current method (i.e. a global 416 // variable). In these two cases, we do a lookup for an ivar with this 417 // name, if the lookup suceeds, we replace it our current decl. 418 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 419 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 420 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(II)) { 421 // FIXME: This should use a new expr for a direct reference, don't turn 422 // this into Self->ivar, just return a BareIVarExpr or something. 423 IdentifierInfo &II = Context.Idents.get("self"); 424 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 425 ObjCIvarRefExpr *MRef= new ObjCIvarRefExpr(IV, IV->getType(), Loc, 426 static_cast<Expr*>(SelfExpr.Val), true, true); 427 Context.setFieldDecl(IFace, IV, MRef); 428 return MRef; 429 } 430 } 431 // Needed to implement property "super.method" notation. 432 if (SD == 0 && II->isStr("super")) { 433 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 434 getCurMethodDecl()->getClassInterface())); 435 return new ObjCSuperExpr(Loc, T); 436 } 437 } 438 if (D == 0) { 439 // Otherwise, this could be an implicitly declared function reference (legal 440 // in C90, extension in C99). 441 if (HasTrailingLParen && II && 442 !getLangOptions().CPlusPlus) // Not in C++. 443 D = ImplicitlyDefineFunction(Loc, *II, S); 444 else { 445 // If this name wasn't predeclared and if this is not a function call, 446 // diagnose the problem. 447 if (SS && !SS->isEmpty()) 448 return Diag(Loc, diag::err_typecheck_no_member) 449 << Name << SS->getRange(); 450 else if (Name.getNameKind() == DeclarationName::CXXOperatorName || 451 Name.getNameKind() == DeclarationName::CXXConversionFunctionName) 452 return Diag(Loc, diag::err_undeclared_use) << Name.getAsString(); 453 else 454 return Diag(Loc, diag::err_undeclared_var_use) << Name; 455 } 456 } 457 458 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 459 if (!MD->isStatic()) { 460 // C++ [class.mfct.nonstatic]p2: 461 // [...] if name lookup (3.4.1) resolves the name in the 462 // id-expression to a nonstatic nontype member of class X or of 463 // a base class of X, the id-expression is transformed into a 464 // class member access expression (5.2.5) using (*this) (9.3.2) 465 // as the postfix-expression to the left of the '.' operator. 466 DeclContext *Ctx = 0; 467 QualType MemberType; 468 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 469 Ctx = FD->getDeclContext(); 470 MemberType = FD->getType(); 471 472 if (const ReferenceType *RefType = MemberType->getAsReferenceType()) 473 MemberType = RefType->getPointeeType(); 474 else if (!FD->isMutable()) { 475 unsigned combinedQualifiers 476 = MemberType.getCVRQualifiers() | MD->getTypeQualifiers(); 477 MemberType = MemberType.getQualifiedType(combinedQualifiers); 478 } 479 } else if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { 480 if (!Method->isStatic()) { 481 Ctx = Method->getParent(); 482 MemberType = Method->getType(); 483 } 484 } else if (OverloadedFunctionDecl *Ovl 485 = dyn_cast<OverloadedFunctionDecl>(D)) { 486 for (OverloadedFunctionDecl::function_iterator 487 Func = Ovl->function_begin(), 488 FuncEnd = Ovl->function_end(); 489 Func != FuncEnd; ++Func) { 490 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(*Func)) 491 if (!DMethod->isStatic()) { 492 Ctx = Ovl->getDeclContext(); 493 MemberType = Context.OverloadTy; 494 break; 495 } 496 } 497 } 498 499 if (Ctx && Ctx->isCXXRecord()) { 500 QualType CtxType = Context.getTagDeclType(cast<CXXRecordDecl>(Ctx)); 501 QualType ThisType = Context.getTagDeclType(MD->getParent()); 502 if ((Context.getCanonicalType(CtxType) 503 == Context.getCanonicalType(ThisType)) || 504 IsDerivedFrom(ThisType, CtxType)) { 505 // Build the implicit member access expression. 506 Expr *This = new CXXThisExpr(SourceLocation(), 507 MD->getThisType(Context)); 508 return new MemberExpr(This, true, cast<NamedDecl>(D), 509 SourceLocation(), MemberType); 510 } 511 } 512 } 513 } 514 515 if (FieldDecl *FD = dyn_cast<FieldDecl>(D)) { 516 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 517 if (MD->isStatic()) 518 // "invalid use of member 'x' in static member function" 519 return Diag(Loc, diag::err_invalid_member_use_in_static_method) 520 << FD->getDeclName(); 521 } 522 523 // Any other ways we could have found the field in a well-formed 524 // program would have been turned into implicit member expressions 525 // above. 526 return Diag(Loc, diag::err_invalid_non_static_member_use) 527 << FD->getDeclName(); 528 } 529 530 if (isa<TypedefDecl>(D)) 531 return Diag(Loc, diag::err_unexpected_typedef) << Name; 532 if (isa<ObjCInterfaceDecl>(D)) 533 return Diag(Loc, diag::err_unexpected_interface) << Name; 534 if (isa<NamespaceDecl>(D)) 535 return Diag(Loc, diag::err_unexpected_namespace) << Name; 536 537 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 538 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 539 return new DeclRefExpr(Ovl, Context.OverloadTy, Loc); 540 541 ValueDecl *VD = cast<ValueDecl>(D); 542 543 // check if referencing an identifier with __attribute__((deprecated)). 544 if (VD->getAttr<DeprecatedAttr>()) 545 Diag(Loc, diag::warn_deprecated) << VD->getDeclName(); 546 547 if (VarDecl *Var = dyn_cast<VarDecl>(VD)) { 548 if (Var->isDeclaredInCondition() && Var->getType()->isScalarType()) { 549 Scope *CheckS = S; 550 while (CheckS) { 551 if (CheckS->isWithinElse() && 552 CheckS->getControlParent()->isDeclScope(Var)) { 553 if (Var->getType()->isBooleanType()) 554 Diag(Loc, diag::warn_value_always_false) << Var->getDeclName(); 555 else 556 Diag(Loc, diag::warn_value_always_zero) << Var->getDeclName(); 557 break; 558 } 559 560 // Move up one more control parent to check again. 561 CheckS = CheckS->getControlParent(); 562 if (CheckS) 563 CheckS = CheckS->getParent(); 564 } 565 } 566 } 567 568 // Only create DeclRefExpr's for valid Decl's. 569 if (VD->isInvalidDecl()) 570 return true; 571 572 // If the identifier reference is inside a block, and it refers to a value 573 // that is outside the block, create a BlockDeclRefExpr instead of a 574 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 575 // the block is formed. 576 // 577 // We do not do this for things like enum constants, global variables, etc, 578 // as they do not get snapshotted. 579 // 580 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 581 // The BlocksAttr indicates the variable is bound by-reference. 582 if (VD->getAttr<BlocksAttr>()) 583 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 584 Loc, true); 585 586 // Variable will be bound by-copy, make it const within the closure. 587 VD->getType().addConst(); 588 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 589 Loc, false); 590 } 591 // If this reference is not in a block or if the referenced variable is 592 // within the block, create a normal DeclRefExpr. 593 594 bool TypeDependent = false; 595 bool ValueDependent = false; 596 if (getLangOptions().CPlusPlus) { 597 // C++ [temp.dep.expr]p3: 598 // An id-expression is type-dependent if it contains: 599 // - an identifier that was declared with a dependent type, 600 if (VD->getType()->isDependentType()) 601 TypeDependent = true; 602 // - FIXME: a template-id that is dependent, 603 // - a conversion-function-id that specifies a dependent type, 604 else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName && 605 Name.getCXXNameType()->isDependentType()) 606 TypeDependent = true; 607 // - a nested-name-specifier that contains a class-name that 608 // names a dependent type. 609 else if (SS && !SS->isEmpty()) { 610 for (DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 611 DC; DC = DC->getParent()) { 612 // FIXME: could stop early at namespace scope. 613 if (DC->isCXXRecord()) { 614 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 615 if (Context.getTypeDeclType(Record)->isDependentType()) { 616 TypeDependent = true; 617 break; 618 } 619 } 620 } 621 } 622 623 // C++ [temp.dep.constexpr]p2: 624 // 625 // An identifier is value-dependent if it is: 626 // - a name declared with a dependent type, 627 if (TypeDependent) 628 ValueDependent = true; 629 // - the name of a non-type template parameter, 630 else if (isa<NonTypeTemplateParmDecl>(VD)) 631 ValueDependent = true; 632 // - a constant with integral or enumeration type and is 633 // initialized with an expression that is value-dependent 634 // (FIXME!). 635 } 636 637 return new DeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc, 638 TypeDependent, ValueDependent); 639} 640 641Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 642 tok::TokenKind Kind) { 643 PredefinedExpr::IdentType IT; 644 645 switch (Kind) { 646 default: assert(0 && "Unknown simple primary expr!"); 647 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 648 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 649 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 650 } 651 652 // Pre-defined identifiers are of type char[x], where x is the length of the 653 // string. 654 unsigned Length; 655 if (FunctionDecl *FD = getCurFunctionDecl()) 656 Length = FD->getIdentifier()->getLength(); 657 else if (ObjCMethodDecl *MD = getCurMethodDecl()) 658 Length = MD->getSynthesizedMethodSize(); 659 else { 660 Diag(Loc, diag::ext_predef_outside_function); 661 // __PRETTY_FUNCTION__ -> "top level", the others produce an empty string. 662 Length = IT == PredefinedExpr::PrettyFunction ? strlen("top level") : 0; 663 } 664 665 666 llvm::APInt LengthI(32, Length + 1); 667 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 668 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 669 return new PredefinedExpr(Loc, ResTy, IT); 670} 671 672Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 673 llvm::SmallString<16> CharBuffer; 674 CharBuffer.resize(Tok.getLength()); 675 const char *ThisTokBegin = &CharBuffer[0]; 676 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 677 678 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 679 Tok.getLocation(), PP); 680 if (Literal.hadError()) 681 return ExprResult(true); 682 683 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 684 685 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 686 Tok.getLocation()); 687} 688 689Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 690 // fast path for a single digit (which is quite common). A single digit 691 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 692 if (Tok.getLength() == 1) { 693 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 694 695 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 696 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 697 Context.IntTy, 698 Tok.getLocation())); 699 } 700 llvm::SmallString<512> IntegerBuffer; 701 // Add padding so that NumericLiteralParser can overread by one character. 702 IntegerBuffer.resize(Tok.getLength()+1); 703 const char *ThisTokBegin = &IntegerBuffer[0]; 704 705 // Get the spelling of the token, which eliminates trigraphs, etc. 706 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 707 708 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 709 Tok.getLocation(), PP); 710 if (Literal.hadError) 711 return ExprResult(true); 712 713 Expr *Res; 714 715 if (Literal.isFloatingLiteral()) { 716 QualType Ty; 717 if (Literal.isFloat) 718 Ty = Context.FloatTy; 719 else if (!Literal.isLong) 720 Ty = Context.DoubleTy; 721 else 722 Ty = Context.LongDoubleTy; 723 724 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 725 726 // isExact will be set by GetFloatValue(). 727 bool isExact = false; 728 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 729 Ty, Tok.getLocation()); 730 731 } else if (!Literal.isIntegerLiteral()) { 732 return ExprResult(true); 733 } else { 734 QualType Ty; 735 736 // long long is a C99 feature. 737 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 738 Literal.isLongLong) 739 Diag(Tok.getLocation(), diag::ext_longlong); 740 741 // Get the value in the widest-possible width. 742 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 743 744 if (Literal.GetIntegerValue(ResultVal)) { 745 // If this value didn't fit into uintmax_t, warn and force to ull. 746 Diag(Tok.getLocation(), diag::warn_integer_too_large); 747 Ty = Context.UnsignedLongLongTy; 748 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 749 "long long is not intmax_t?"); 750 } else { 751 // If this value fits into a ULL, try to figure out what else it fits into 752 // according to the rules of C99 6.4.4.1p5. 753 754 // Octal, Hexadecimal, and integers with a U suffix are allowed to 755 // be an unsigned int. 756 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 757 758 // Check from smallest to largest, picking the smallest type we can. 759 unsigned Width = 0; 760 if (!Literal.isLong && !Literal.isLongLong) { 761 // Are int/unsigned possibilities? 762 unsigned IntSize = Context.Target.getIntWidth(); 763 764 // Does it fit in a unsigned int? 765 if (ResultVal.isIntN(IntSize)) { 766 // Does it fit in a signed int? 767 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 768 Ty = Context.IntTy; 769 else if (AllowUnsigned) 770 Ty = Context.UnsignedIntTy; 771 Width = IntSize; 772 } 773 } 774 775 // Are long/unsigned long possibilities? 776 if (Ty.isNull() && !Literal.isLongLong) { 777 unsigned LongSize = Context.Target.getLongWidth(); 778 779 // Does it fit in a unsigned long? 780 if (ResultVal.isIntN(LongSize)) { 781 // Does it fit in a signed long? 782 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 783 Ty = Context.LongTy; 784 else if (AllowUnsigned) 785 Ty = Context.UnsignedLongTy; 786 Width = LongSize; 787 } 788 } 789 790 // Finally, check long long if needed. 791 if (Ty.isNull()) { 792 unsigned LongLongSize = Context.Target.getLongLongWidth(); 793 794 // Does it fit in a unsigned long long? 795 if (ResultVal.isIntN(LongLongSize)) { 796 // Does it fit in a signed long long? 797 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 798 Ty = Context.LongLongTy; 799 else if (AllowUnsigned) 800 Ty = Context.UnsignedLongLongTy; 801 Width = LongLongSize; 802 } 803 } 804 805 // If we still couldn't decide a type, we probably have something that 806 // does not fit in a signed long long, but has no U suffix. 807 if (Ty.isNull()) { 808 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 809 Ty = Context.UnsignedLongLongTy; 810 Width = Context.Target.getLongLongWidth(); 811 } 812 813 if (ResultVal.getBitWidth() != Width) 814 ResultVal.trunc(Width); 815 } 816 817 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 818 } 819 820 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 821 if (Literal.isImaginary) 822 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 823 824 return Res; 825} 826 827Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 828 ExprTy *Val) { 829 Expr *E = (Expr *)Val; 830 assert((E != 0) && "ActOnParenExpr() missing expr"); 831 return new ParenExpr(L, R, E); 832} 833 834/// The UsualUnaryConversions() function is *not* called by this routine. 835/// See C99 6.3.2.1p[2-4] for more details. 836bool Sema::CheckSizeOfAlignOfOperand(QualType exprType, 837 SourceLocation OpLoc, 838 const SourceRange &ExprRange, 839 bool isSizeof) { 840 // C99 6.5.3.4p1: 841 if (isa<FunctionType>(exprType) && isSizeof) 842 // alignof(function) is allowed. 843 Diag(OpLoc, diag::ext_sizeof_function_type) << ExprRange; 844 else if (exprType->isVoidType()) 845 Diag(OpLoc, diag::ext_sizeof_void_type) 846 << (isSizeof ? "sizeof" : "__alignof") << ExprRange; 847 else if (exprType->isIncompleteType()) 848 return Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 849 diag::err_alignof_incomplete_type) 850 << exprType << ExprRange; 851 852 return false; 853} 854 855/// ActOnSizeOfAlignOfExpr - Handle @c sizeof(type) and @c sizeof @c expr and 856/// the same for @c alignof and @c __alignof 857/// Note that the ArgRange is invalid if isType is false. 858Action::ExprResult 859Sema::ActOnSizeOfAlignOfExpr(SourceLocation OpLoc, bool isSizeof, bool isType, 860 void *TyOrEx, const SourceRange &ArgRange) { 861 // If error parsing type, ignore. 862 if (TyOrEx == 0) return true; 863 864 QualType ArgTy; 865 SourceRange Range; 866 if (isType) { 867 ArgTy = QualType::getFromOpaquePtr(TyOrEx); 868 Range = ArgRange; 869 } else { 870 // Get the end location. 871 Expr *ArgEx = (Expr *)TyOrEx; 872 Range = ArgEx->getSourceRange(); 873 ArgTy = ArgEx->getType(); 874 } 875 876 // Verify that the operand is valid. 877 if (CheckSizeOfAlignOfOperand(ArgTy, OpLoc, Range, isSizeof)) 878 return true; 879 880 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 881 return new SizeOfAlignOfExpr(isSizeof, isType, TyOrEx, Context.getSizeType(), 882 OpLoc, Range.getEnd()); 883} 884 885QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 886 DefaultFunctionArrayConversion(V); 887 888 // These operators return the element type of a complex type. 889 if (const ComplexType *CT = V->getType()->getAsComplexType()) 890 return CT->getElementType(); 891 892 // Otherwise they pass through real integer and floating point types here. 893 if (V->getType()->isArithmeticType()) 894 return V->getType(); 895 896 // Reject anything else. 897 Diag(Loc, diag::err_realimag_invalid_type) << V->getType(); 898 return QualType(); 899} 900 901 902 903Action::ExprResult Sema::ActOnPostfixUnaryOp(Scope *S, SourceLocation OpLoc, 904 tok::TokenKind Kind, 905 ExprTy *Input) { 906 Expr *Arg = (Expr *)Input; 907 908 UnaryOperator::Opcode Opc; 909 switch (Kind) { 910 default: assert(0 && "Unknown unary op!"); 911 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 912 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 913 } 914 915 if (getLangOptions().CPlusPlus && 916 (Arg->getType()->isRecordType() || Arg->getType()->isEnumeralType())) { 917 // Which overloaded operator? 918 OverloadedOperatorKind OverOp = 919 (Opc == UnaryOperator::PostInc)? OO_PlusPlus : OO_MinusMinus; 920 921 // C++ [over.inc]p1: 922 // 923 // [...] If the function is a member function with one 924 // parameter (which shall be of type int) or a non-member 925 // function with two parameters (the second of which shall be 926 // of type int), it defines the postfix increment operator ++ 927 // for objects of that type. When the postfix increment is 928 // called as a result of using the ++ operator, the int 929 // argument will have value zero. 930 Expr *Args[2] = { 931 Arg, 932 new IntegerLiteral(llvm::APInt(Context.Target.getIntWidth(), 0, 933 /*isSigned=*/true), 934 Context.IntTy, SourceLocation()) 935 }; 936 937 // Build the candidate set for overloading 938 OverloadCandidateSet CandidateSet; 939 AddOperatorCandidates(OverOp, S, Args, 2, CandidateSet); 940 941 // Perform overload resolution. 942 OverloadCandidateSet::iterator Best; 943 switch (BestViableFunction(CandidateSet, Best)) { 944 case OR_Success: { 945 // We found a built-in operator or an overloaded operator. 946 FunctionDecl *FnDecl = Best->Function; 947 948 if (FnDecl) { 949 // We matched an overloaded operator. Build a call to that 950 // operator. 951 952 // Convert the arguments. 953 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 954 if (PerformObjectArgumentInitialization(Arg, Method)) 955 return true; 956 } else { 957 // Convert the arguments. 958 if (PerformCopyInitialization(Arg, 959 FnDecl->getParamDecl(0)->getType(), 960 "passing")) 961 return true; 962 } 963 964 // Determine the result type 965 QualType ResultTy 966 = FnDecl->getType()->getAsFunctionType()->getResultType(); 967 ResultTy = ResultTy.getNonReferenceType(); 968 969 // Build the actual expression node. 970 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 971 SourceLocation()); 972 UsualUnaryConversions(FnExpr); 973 974 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, OpLoc); 975 } else { 976 // We matched a built-in operator. Convert the arguments, then 977 // break out so that we will build the appropriate built-in 978 // operator node. 979 if (PerformCopyInitialization(Arg, Best->BuiltinTypes.ParamTypes[0], 980 "passing")) 981 return true; 982 983 break; 984 } 985 } 986 987 case OR_No_Viable_Function: 988 // No viable function; fall through to handling this as a 989 // built-in operator, which will produce an error message for us. 990 break; 991 992 case OR_Ambiguous: 993 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 994 << UnaryOperator::getOpcodeStr(Opc) 995 << Arg->getSourceRange(); 996 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 997 return true; 998 } 999 1000 // Either we found no viable overloaded operator or we matched a 1001 // built-in operator. In either case, fall through to trying to 1002 // build a built-in operation. 1003 } 1004 1005 QualType result = CheckIncrementDecrementOperand(Arg, OpLoc, 1006 Opc == UnaryOperator::PostInc); 1007 if (result.isNull()) 1008 return true; 1009 return new UnaryOperator(Arg, Opc, result, OpLoc); 1010} 1011 1012Action::ExprResult Sema:: 1013ActOnArraySubscriptExpr(Scope *S, ExprTy *Base, SourceLocation LLoc, 1014 ExprTy *Idx, SourceLocation RLoc) { 1015 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 1016 1017 if (getLangOptions().CPlusPlus && 1018 (LHSExp->getType()->isRecordType() || 1019 LHSExp->getType()->isEnumeralType() || 1020 RHSExp->getType()->isRecordType() || 1021 RHSExp->getType()->isEnumeralType())) { 1022 // Add the appropriate overloaded operators (C++ [over.match.oper]) 1023 // to the candidate set. 1024 OverloadCandidateSet CandidateSet; 1025 Expr *Args[2] = { LHSExp, RHSExp }; 1026 AddOperatorCandidates(OO_Subscript, S, Args, 2, CandidateSet); 1027 1028 // Perform overload resolution. 1029 OverloadCandidateSet::iterator Best; 1030 switch (BestViableFunction(CandidateSet, Best)) { 1031 case OR_Success: { 1032 // We found a built-in operator or an overloaded operator. 1033 FunctionDecl *FnDecl = Best->Function; 1034 1035 if (FnDecl) { 1036 // We matched an overloaded operator. Build a call to that 1037 // operator. 1038 1039 // Convert the arguments. 1040 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 1041 if (PerformObjectArgumentInitialization(LHSExp, Method) || 1042 PerformCopyInitialization(RHSExp, 1043 FnDecl->getParamDecl(0)->getType(), 1044 "passing")) 1045 return true; 1046 } else { 1047 // Convert the arguments. 1048 if (PerformCopyInitialization(LHSExp, 1049 FnDecl->getParamDecl(0)->getType(), 1050 "passing") || 1051 PerformCopyInitialization(RHSExp, 1052 FnDecl->getParamDecl(1)->getType(), 1053 "passing")) 1054 return true; 1055 } 1056 1057 // Determine the result type 1058 QualType ResultTy 1059 = FnDecl->getType()->getAsFunctionType()->getResultType(); 1060 ResultTy = ResultTy.getNonReferenceType(); 1061 1062 // Build the actual expression node. 1063 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 1064 SourceLocation()); 1065 UsualUnaryConversions(FnExpr); 1066 1067 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, LLoc); 1068 } else { 1069 // We matched a built-in operator. Convert the arguments, then 1070 // break out so that we will build the appropriate built-in 1071 // operator node. 1072 if (PerformCopyInitialization(LHSExp, Best->BuiltinTypes.ParamTypes[0], 1073 "passing") || 1074 PerformCopyInitialization(RHSExp, Best->BuiltinTypes.ParamTypes[1], 1075 "passing")) 1076 return true; 1077 1078 break; 1079 } 1080 } 1081 1082 case OR_No_Viable_Function: 1083 // No viable function; fall through to handling this as a 1084 // built-in operator, which will produce an error message for us. 1085 break; 1086 1087 case OR_Ambiguous: 1088 Diag(LLoc, diag::err_ovl_ambiguous_oper) 1089 << "[]" 1090 << LHSExp->getSourceRange() << RHSExp->getSourceRange(); 1091 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1092 return true; 1093 } 1094 1095 // Either we found no viable overloaded operator or we matched a 1096 // built-in operator. In either case, fall through to trying to 1097 // build a built-in operation. 1098 } 1099 1100 // Perform default conversions. 1101 DefaultFunctionArrayConversion(LHSExp); 1102 DefaultFunctionArrayConversion(RHSExp); 1103 1104 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 1105 1106 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 1107 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 1108 // in the subscript position. As a result, we need to derive the array base 1109 // and index from the expression types. 1110 Expr *BaseExpr, *IndexExpr; 1111 QualType ResultType; 1112 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 1113 BaseExpr = LHSExp; 1114 IndexExpr = RHSExp; 1115 // FIXME: need to deal with const... 1116 ResultType = PTy->getPointeeType(); 1117 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 1118 // Handle the uncommon case of "123[Ptr]". 1119 BaseExpr = RHSExp; 1120 IndexExpr = LHSExp; 1121 // FIXME: need to deal with const... 1122 ResultType = PTy->getPointeeType(); 1123 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 1124 BaseExpr = LHSExp; // vectors: V[123] 1125 IndexExpr = RHSExp; 1126 1127 // Component access limited to variables (reject vec4.rg[1]). 1128 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1129 !isa<ExtVectorElementExpr>(BaseExpr)) 1130 return Diag(LLoc, diag::err_ext_vector_component_access) 1131 << SourceRange(LLoc, RLoc); 1132 // FIXME: need to deal with const... 1133 ResultType = VTy->getElementType(); 1134 } else { 1135 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value) 1136 << RHSExp->getSourceRange(); 1137 } 1138 // C99 6.5.2.1p1 1139 if (!IndexExpr->getType()->isIntegerType()) 1140 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript) 1141 << IndexExpr->getSourceRange(); 1142 1143 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 1144 // the following check catches trying to index a pointer to a function (e.g. 1145 // void (*)(int)) and pointers to incomplete types. Functions are not 1146 // objects in C99. 1147 if (!ResultType->isObjectType()) 1148 return Diag(BaseExpr->getLocStart(), 1149 diag::err_typecheck_subscript_not_object) 1150 << BaseExpr->getType() << BaseExpr->getSourceRange(); 1151 1152 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 1153} 1154 1155QualType Sema:: 1156CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 1157 IdentifierInfo &CompName, SourceLocation CompLoc) { 1158 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 1159 1160 // This flag determines whether or not the component is to be treated as a 1161 // special name, or a regular GLSL-style component access. 1162 bool SpecialComponent = false; 1163 1164 // The vector accessor can't exceed the number of elements. 1165 const char *compStr = CompName.getName(); 1166 if (strlen(compStr) > vecType->getNumElements()) { 1167 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1168 << baseType << SourceRange(CompLoc); 1169 return QualType(); 1170 } 1171 1172 // Check that we've found one of the special components, or that the component 1173 // names must come from the same set. 1174 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 1175 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 1176 SpecialComponent = true; 1177 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 1178 do 1179 compStr++; 1180 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 1181 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 1182 do 1183 compStr++; 1184 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 1185 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 1186 do 1187 compStr++; 1188 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 1189 } 1190 1191 if (!SpecialComponent && *compStr) { 1192 // We didn't get to the end of the string. This means the component names 1193 // didn't come from the same set *or* we encountered an illegal name. 1194 Diag(OpLoc, diag::err_ext_vector_component_name_illegal) 1195 << std::string(compStr,compStr+1) << SourceRange(CompLoc); 1196 return QualType(); 1197 } 1198 // Each component accessor can't exceed the vector type. 1199 compStr = CompName.getName(); 1200 while (*compStr) { 1201 if (vecType->isAccessorWithinNumElements(*compStr)) 1202 compStr++; 1203 else 1204 break; 1205 } 1206 if (!SpecialComponent && *compStr) { 1207 // We didn't get to the end of the string. This means a component accessor 1208 // exceeds the number of elements in the vector. 1209 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length) 1210 << baseType << SourceRange(CompLoc); 1211 return QualType(); 1212 } 1213 1214 // If we have a special component name, verify that the current vector length 1215 // is an even number, since all special component names return exactly half 1216 // the elements. 1217 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 1218 Diag(OpLoc, diag::err_ext_vector_component_requires_even) 1219 << baseType << SourceRange(CompLoc); 1220 return QualType(); 1221 } 1222 1223 // The component accessor looks fine - now we need to compute the actual type. 1224 // The vector type is implied by the component accessor. For example, 1225 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 1226 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 1227 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 1228 : CompName.getLength(); 1229 if (CompSize == 1) 1230 return vecType->getElementType(); 1231 1232 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 1233 // Now look up the TypeDefDecl from the vector type. Without this, 1234 // diagostics look bad. We want extended vector types to appear built-in. 1235 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 1236 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 1237 return Context.getTypedefType(ExtVectorDecls[i]); 1238 } 1239 return VT; // should never get here (a typedef type should always be found). 1240} 1241 1242/// constructSetterName - Return the setter name for the given 1243/// identifier, i.e. "set" + Name where the initial character of Name 1244/// has been capitalized. 1245// FIXME: Merge with same routine in Parser. But where should this 1246// live? 1247static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 1248 const IdentifierInfo *Name) { 1249 llvm::SmallString<100> SelectorName; 1250 SelectorName = "set"; 1251 SelectorName.append(Name->getName(), Name->getName()+Name->getLength()); 1252 SelectorName[3] = toupper(SelectorName[3]); 1253 return &Idents.get(&SelectorName[0], &SelectorName[SelectorName.size()]); 1254} 1255 1256Action::ExprResult Sema:: 1257ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 1258 tok::TokenKind OpKind, SourceLocation MemberLoc, 1259 IdentifierInfo &Member) { 1260 Expr *BaseExpr = static_cast<Expr *>(Base); 1261 assert(BaseExpr && "no record expression"); 1262 1263 // Perform default conversions. 1264 DefaultFunctionArrayConversion(BaseExpr); 1265 1266 QualType BaseType = BaseExpr->getType(); 1267 assert(!BaseType.isNull() && "no type for member expression"); 1268 1269 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 1270 // must have pointer type, and the accessed type is the pointee. 1271 if (OpKind == tok::arrow) { 1272 if (const PointerType *PT = BaseType->getAsPointerType()) 1273 BaseType = PT->getPointeeType(); 1274 else if (getLangOptions().CPlusPlus && BaseType->isRecordType()) 1275 return BuildOverloadedArrowExpr(BaseExpr, OpLoc, MemberLoc, Member); 1276 else 1277 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow) 1278 << BaseType << BaseExpr->getSourceRange(); 1279 } 1280 1281 // Handle field access to simple records. This also handles access to fields 1282 // of the ObjC 'id' struct. 1283 if (const RecordType *RTy = BaseType->getAsRecordType()) { 1284 RecordDecl *RDecl = RTy->getDecl(); 1285 if (RTy->isIncompleteType()) 1286 return Diag(OpLoc, diag::err_typecheck_incomplete_tag) 1287 << RDecl->getDeclName() << BaseExpr->getSourceRange(); 1288 // The record definition is complete, now make sure the member is valid. 1289 // FIXME: Qualified name lookup for C++ is a bit more complicated 1290 // than this. 1291 DeclContext::lookup_result Lookup = RDecl->lookup(Context, &Member); 1292 if (Lookup.first == Lookup.second) { 1293 return Diag(MemberLoc, diag::err_typecheck_no_member) 1294 << &Member << BaseExpr->getSourceRange(); 1295 } 1296 1297 if (FieldDecl *MemberDecl = dyn_cast<FieldDecl>(*Lookup.first)) { 1298 // Figure out the type of the member; see C99 6.5.2.3p3, C++ [expr.ref] 1299 // FIXME: Handle address space modifiers 1300 QualType MemberType = MemberDecl->getType(); 1301 if (const ReferenceType *Ref = MemberType->getAsReferenceType()) 1302 MemberType = Ref->getPointeeType(); 1303 else { 1304 unsigned combinedQualifiers = 1305 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 1306 if (MemberDecl->isMutable()) 1307 combinedQualifiers &= ~QualType::Const; 1308 MemberType = MemberType.getQualifiedType(combinedQualifiers); 1309 } 1310 1311 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 1312 MemberLoc, MemberType); 1313 } else if (CXXClassVarDecl *Var = dyn_cast<CXXClassVarDecl>(*Lookup.first)) 1314 return new MemberExpr(BaseExpr, OpKind == tok::arrow, Var, MemberLoc, 1315 Var->getType().getNonReferenceType()); 1316 else if (FunctionDecl *MemberFn = dyn_cast<FunctionDecl>(*Lookup.first)) 1317 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberFn, MemberLoc, 1318 MemberFn->getType()); 1319 else if (OverloadedFunctionDecl *Ovl 1320 = dyn_cast<OverloadedFunctionDecl>(*Lookup.first)) 1321 return new MemberExpr(BaseExpr, OpKind == tok::arrow, Ovl, MemberLoc, 1322 Context.OverloadTy); 1323 else if (EnumConstantDecl *Enum = dyn_cast<EnumConstantDecl>(*Lookup.first)) 1324 return new MemberExpr(BaseExpr, OpKind == tok::arrow, Enum, MemberLoc, 1325 Enum->getType()); 1326 else if (isa<TypeDecl>(*Lookup.first)) 1327 return Diag(MemberLoc, diag::err_typecheck_member_reference_type) 1328 << DeclarationName(&Member) << int(OpKind == tok::arrow); 1329 1330 // We found a declaration kind that we didn't expect. This is a 1331 // generic error message that tells the user that she can't refer 1332 // to this member with '.' or '->'. 1333 return Diag(MemberLoc, diag::err_typecheck_member_reference_unknown) 1334 << DeclarationName(&Member) << int(OpKind == tok::arrow); 1335 } 1336 1337 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 1338 // (*Obj).ivar. 1339 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 1340 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) { 1341 ObjCIvarRefExpr *MRef= new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, 1342 BaseExpr, 1343 OpKind == tok::arrow); 1344 Context.setFieldDecl(IFTy->getDecl(), IV, MRef); 1345 return MRef; 1346 } 1347 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar) 1348 << IFTy->getDecl()->getDeclName() << &Member 1349 << BaseExpr->getSourceRange(); 1350 } 1351 1352 // Handle Objective-C property access, which is "Obj.property" where Obj is a 1353 // pointer to a (potentially qualified) interface type. 1354 const PointerType *PTy; 1355 const ObjCInterfaceType *IFTy; 1356 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 1357 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 1358 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 1359 1360 // Search for a declared property first. 1361 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 1362 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1363 1364 // Check protocols on qualified interfaces. 1365 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 1366 E = IFTy->qual_end(); I != E; ++I) 1367 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1368 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1369 1370 // If that failed, look for an "implicit" property by seeing if the nullary 1371 // selector is implemented. 1372 1373 // FIXME: The logic for looking up nullary and unary selectors should be 1374 // shared with the code in ActOnInstanceMessage. 1375 1376 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1377 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1378 1379 // If this reference is in an @implementation, check for 'private' methods. 1380 if (!Getter) 1381 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1382 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1383 if (ObjCImplementationDecl *ImpDecl = 1384 ObjCImplementations[ClassDecl->getIdentifier()]) 1385 Getter = ImpDecl->getInstanceMethod(Sel); 1386 1387 // Look through local category implementations associated with the class. 1388 if (!Getter) { 1389 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 1390 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1391 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 1392 } 1393 } 1394 if (Getter) { 1395 // If we found a getter then this may be a valid dot-reference, we 1396 // will look for the matching setter, in case it is needed. 1397 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 1398 &Member); 1399 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 1400 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1401 if (!Setter) { 1402 // If this reference is in an @implementation, also check for 'private' 1403 // methods. 1404 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1405 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1406 if (ObjCImplementationDecl *ImpDecl = 1407 ObjCImplementations[ClassDecl->getIdentifier()]) 1408 Setter = ImpDecl->getInstanceMethod(SetterSel); 1409 } 1410 // Look through local category implementations associated with the class. 1411 if (!Setter) { 1412 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Setter; i++) { 1413 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 1414 Setter = ObjCCategoryImpls[i]->getInstanceMethod(SetterSel); 1415 } 1416 } 1417 1418 // FIXME: we must check that the setter has property type. 1419 return new ObjCKVCRefExpr(Getter, Getter->getResultType(), Setter, 1420 MemberLoc, BaseExpr); 1421 } 1422 1423 return Diag(MemberLoc, diag::err_property_not_found) << 1424 &Member << BaseType; 1425 } 1426 // Handle properties on qualified "id" protocols. 1427 const ObjCQualifiedIdType *QIdTy; 1428 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1429 // Check protocols on qualified interfaces. 1430 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1431 E = QIdTy->qual_end(); I != E; ++I) { 1432 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1433 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1434 // Also must look for a getter name which uses property syntax. 1435 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 1436 if (ObjCMethodDecl *OMD = (*I)->getInstanceMethod(Sel)) { 1437 return new ObjCMessageExpr(BaseExpr, Sel, OMD->getResultType(), OMD, 1438 OpLoc, MemberLoc, NULL, 0); 1439 } 1440 } 1441 1442 return Diag(MemberLoc, diag::err_property_not_found) << 1443 &Member << BaseType; 1444 } 1445 // Handle 'field access' to vectors, such as 'V.xx'. 1446 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1447 // Component access limited to variables (reject vec4.rg.g). 1448 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1449 !isa<ExtVectorElementExpr>(BaseExpr)) 1450 return Diag(MemberLoc, diag::err_ext_vector_component_access) 1451 << BaseExpr->getSourceRange(); 1452 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1453 if (ret.isNull()) 1454 return true; 1455 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1456 } 1457 1458 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union) 1459 << BaseType << BaseExpr->getSourceRange(); 1460} 1461 1462/// ConvertArgumentsForCall - Converts the arguments specified in 1463/// Args/NumArgs to the parameter types of the function FDecl with 1464/// function prototype Proto. Call is the call expression itself, and 1465/// Fn is the function expression. For a C++ member function, this 1466/// routine does not attempt to convert the object argument. Returns 1467/// true if the call is ill-formed. 1468bool 1469Sema::ConvertArgumentsForCall(CallExpr *Call, Expr *Fn, 1470 FunctionDecl *FDecl, 1471 const FunctionTypeProto *Proto, 1472 Expr **Args, unsigned NumArgs, 1473 SourceLocation RParenLoc) { 1474 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1475 // assignment, to the types of the corresponding parameter, ... 1476 unsigned NumArgsInProto = Proto->getNumArgs(); 1477 unsigned NumArgsToCheck = NumArgs; 1478 1479 // If too few arguments are available (and we don't have default 1480 // arguments for the remaining parameters), don't make the call. 1481 if (NumArgs < NumArgsInProto) { 1482 if (!FDecl || NumArgs < FDecl->getMinRequiredArguments()) 1483 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 1484 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange(); 1485 // Use default arguments for missing arguments 1486 NumArgsToCheck = NumArgsInProto; 1487 Call->setNumArgs(NumArgsInProto); 1488 } 1489 1490 // If too many are passed and not variadic, error on the extras and drop 1491 // them. 1492 if (NumArgs > NumArgsInProto) { 1493 if (!Proto->isVariadic()) { 1494 Diag(Args[NumArgsInProto]->getLocStart(), 1495 diag::err_typecheck_call_too_many_args) 1496 << Fn->getType()->isBlockPointerType() << Fn->getSourceRange() 1497 << SourceRange(Args[NumArgsInProto]->getLocStart(), 1498 Args[NumArgs-1]->getLocEnd()); 1499 // This deletes the extra arguments. 1500 Call->setNumArgs(NumArgsInProto); 1501 } 1502 NumArgsToCheck = NumArgsInProto; 1503 } 1504 1505 // Continue to check argument types (even if we have too few/many args). 1506 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1507 QualType ProtoArgType = Proto->getArgType(i); 1508 1509 Expr *Arg; 1510 if (i < NumArgs) 1511 Arg = Args[i]; 1512 else 1513 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1514 QualType ArgType = Arg->getType(); 1515 1516 // Pass the argument. 1517 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 1518 return true; 1519 1520 Call->setArg(i, Arg); 1521 } 1522 1523 // If this is a variadic call, handle args passed through "...". 1524 if (Proto->isVariadic()) { 1525 // Promote the arguments (C99 6.5.2.2p7). 1526 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1527 Expr *Arg = Args[i]; 1528 DefaultArgumentPromotion(Arg); 1529 Call->setArg(i, Arg); 1530 } 1531 } 1532 1533 return false; 1534} 1535 1536/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1537/// This provides the location of the left/right parens and a list of comma 1538/// locations. 1539Action::ExprResult 1540Sema::ActOnCallExpr(Scope *S, ExprTy *fn, SourceLocation LParenLoc, 1541 ExprTy **args, unsigned NumArgs, 1542 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1543 Expr *Fn = static_cast<Expr *>(fn); 1544 Expr **Args = reinterpret_cast<Expr**>(args); 1545 assert(Fn && "no function call expression"); 1546 FunctionDecl *FDecl = NULL; 1547 OverloadedFunctionDecl *Ovl = NULL; 1548 1549 // Determine whether this is a dependent call inside a C++ template, 1550 // in which case we won't do any semantic analysis now. 1551 bool Dependent = false; 1552 if (Fn->isTypeDependent()) { 1553 if (CXXDependentNameExpr *FnName = dyn_cast<CXXDependentNameExpr>(Fn)) { 1554 if (Expr::hasAnyTypeDependentArguments(Args, NumArgs)) 1555 Dependent = true; 1556 else { 1557 // Resolve the CXXDependentNameExpr to an actual identifier; 1558 // it wasn't really a dependent name after all. 1559 ExprResult Resolved 1560 = ActOnDeclarationNameExpr(S, FnName->getLocation(), FnName->getName(), 1561 /*HasTrailingLParen=*/true, 1562 /*SS=*/0, 1563 /*ForceResolution=*/true); 1564 if (Resolved.isInvalid) 1565 return true; 1566 else { 1567 delete Fn; 1568 Fn = (Expr *)Resolved.Val; 1569 } 1570 } 1571 } else 1572 Dependent = true; 1573 } else 1574 Dependent = Expr::hasAnyTypeDependentArguments(Args, NumArgs); 1575 1576 // FIXME: Will need to cache the results of name lookup (including 1577 // ADL) in Fn. 1578 if (Dependent) 1579 return new CallExpr(Fn, Args, NumArgs, Context.DependentTy, RParenLoc); 1580 1581 // Determine whether this is a call to an object (C++ [over.call.object]). 1582 if (getLangOptions().CPlusPlus && Fn->getType()->isRecordType()) 1583 return BuildCallToObjectOfClassType(S, Fn, LParenLoc, Args, NumArgs, 1584 CommaLocs, RParenLoc); 1585 1586 // Determine whether this is a call to a member function. 1587 if (getLangOptions().CPlusPlus) { 1588 if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(Fn->IgnoreParens())) 1589 if (isa<OverloadedFunctionDecl>(MemExpr->getMemberDecl()) || 1590 isa<CXXMethodDecl>(MemExpr->getMemberDecl())) 1591 return BuildCallToMemberFunction(S, Fn, LParenLoc, Args, NumArgs, 1592 CommaLocs, RParenLoc); 1593 } 1594 1595 // If we're directly calling a function or a set of overloaded 1596 // functions, get the appropriate declaration. 1597 { 1598 DeclRefExpr *DRExpr = NULL; 1599 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1600 DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()); 1601 else 1602 DRExpr = dyn_cast<DeclRefExpr>(Fn); 1603 1604 if (DRExpr) { 1605 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1606 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1607 } 1608 } 1609 1610 if (Ovl) { 1611 FDecl = ResolveOverloadedCallFn(Fn, Ovl, LParenLoc, Args, NumArgs, CommaLocs, 1612 RParenLoc); 1613 if (!FDecl) 1614 return true; 1615 1616 // Update Fn to refer to the actual function selected. 1617 Expr *NewFn = new DeclRefExpr(FDecl, FDecl->getType(), 1618 Fn->getSourceRange().getBegin()); 1619 Fn->Destroy(Context); 1620 Fn = NewFn; 1621 } 1622 1623 // Promote the function operand. 1624 UsualUnaryConversions(Fn); 1625 1626 // Make the call expr early, before semantic checks. This guarantees cleanup 1627 // of arguments and function on error. 1628 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1629 Context.BoolTy, RParenLoc)); 1630 1631 const FunctionType *FuncT; 1632 if (!Fn->getType()->isBlockPointerType()) { 1633 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1634 // have type pointer to function". 1635 const PointerType *PT = Fn->getType()->getAsPointerType(); 1636 if (PT == 0) 1637 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1638 << Fn->getType() << Fn->getSourceRange(); 1639 FuncT = PT->getPointeeType()->getAsFunctionType(); 1640 } else { // This is a block call. 1641 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1642 getAsFunctionType(); 1643 } 1644 if (FuncT == 0) 1645 return Diag(LParenLoc, diag::err_typecheck_call_not_function) 1646 << Fn->getType() << Fn->getSourceRange(); 1647 1648 // We know the result type of the call, set it. 1649 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 1650 1651 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1652 if (ConvertArgumentsForCall(&*TheCall, Fn, FDecl, Proto, Args, NumArgs, 1653 RParenLoc)) 1654 return true; 1655 } else { 1656 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1657 1658 // Promote the arguments (C99 6.5.2.2p6). 1659 for (unsigned i = 0; i != NumArgs; i++) { 1660 Expr *Arg = Args[i]; 1661 DefaultArgumentPromotion(Arg); 1662 TheCall->setArg(i, Arg); 1663 } 1664 } 1665 1666 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(FDecl)) 1667 if (!Method->isStatic()) 1668 return Diag(LParenLoc, diag::err_member_call_without_object) 1669 << Fn->getSourceRange(); 1670 1671 // Do special checking on direct calls to functions. 1672 if (FDecl) 1673 return CheckFunctionCall(FDecl, TheCall.take()); 1674 1675 return TheCall.take(); 1676} 1677 1678Action::ExprResult Sema:: 1679ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1680 SourceLocation RParenLoc, ExprTy *InitExpr) { 1681 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1682 QualType literalType = QualType::getFromOpaquePtr(Ty); 1683 // FIXME: put back this assert when initializers are worked out. 1684 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1685 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1686 1687 if (literalType->isArrayType()) { 1688 if (literalType->isVariableArrayType()) 1689 return Diag(LParenLoc, diag::err_variable_object_no_init) 1690 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1691 } else if (literalType->isIncompleteType()) { 1692 return Diag(LParenLoc, diag::err_typecheck_decl_incomplete_type) 1693 << literalType 1694 << SourceRange(LParenLoc, literalExpr->getSourceRange().getEnd()); 1695 } 1696 1697 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 1698 DeclarationName())) 1699 return true; 1700 1701 bool isFileScope = getCurFunctionOrMethodDecl() == 0; 1702 if (isFileScope) { // 6.5.2.5p3 1703 if (CheckForConstantInitializer(literalExpr, literalType)) 1704 return true; 1705 } 1706 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, 1707 isFileScope); 1708} 1709 1710Action::ExprResult Sema:: 1711ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1712 InitListDesignations &Designators, 1713 SourceLocation RBraceLoc) { 1714 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1715 1716 // Semantic analysis for initializers is done by ActOnDeclarator() and 1717 // CheckInitializer() - it requires knowledge of the object being intialized. 1718 1719 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc, 1720 Designators.hasAnyDesignators()); 1721 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1722 return E; 1723} 1724 1725/// CheckCastTypes - Check type constraints for casting between types. 1726bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1727 UsualUnaryConversions(castExpr); 1728 1729 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1730 // type needs to be scalar. 1731 if (castType->isVoidType()) { 1732 // Cast to void allows any expr type. 1733 } else if (castType->isDependentType() || castExpr->isTypeDependent()) { 1734 // We can't check any more until template instantiation time. 1735 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1736 // GCC struct/union extension: allow cast to self. 1737 if (Context.getCanonicalType(castType) != 1738 Context.getCanonicalType(castExpr->getType()) || 1739 (!castType->isStructureType() && !castType->isUnionType())) { 1740 // Reject any other conversions to non-scalar types. 1741 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar) 1742 << castType << castExpr->getSourceRange(); 1743 } 1744 1745 // accept this, but emit an ext-warn. 1746 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar) 1747 << castType << castExpr->getSourceRange(); 1748 } else if (!castExpr->getType()->isScalarType() && 1749 !castExpr->getType()->isVectorType()) { 1750 return Diag(castExpr->getLocStart(), 1751 diag::err_typecheck_expect_scalar_operand) 1752 << castExpr->getType() << castExpr->getSourceRange(); 1753 } else if (castExpr->getType()->isVectorType()) { 1754 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1755 return true; 1756 } else if (castType->isVectorType()) { 1757 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1758 return true; 1759 } 1760 return false; 1761} 1762 1763bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1764 assert(VectorTy->isVectorType() && "Not a vector type!"); 1765 1766 if (Ty->isVectorType() || Ty->isIntegerType()) { 1767 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1768 return Diag(R.getBegin(), 1769 Ty->isVectorType() ? 1770 diag::err_invalid_conversion_between_vectors : 1771 diag::err_invalid_conversion_between_vector_and_integer) 1772 << VectorTy << Ty << R; 1773 } else 1774 return Diag(R.getBegin(), 1775 diag::err_invalid_conversion_between_vector_and_scalar) 1776 << VectorTy << Ty << R; 1777 1778 return false; 1779} 1780 1781Action::ExprResult Sema:: 1782ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1783 SourceLocation RParenLoc, ExprTy *Op) { 1784 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1785 1786 Expr *castExpr = static_cast<Expr*>(Op); 1787 QualType castType = QualType::getFromOpaquePtr(Ty); 1788 1789 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1790 return true; 1791 return new CStyleCastExpr(castType, castExpr, castType, LParenLoc, RParenLoc); 1792} 1793 1794/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1795/// In that case, lex = cond. 1796inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1797 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1798 UsualUnaryConversions(cond); 1799 UsualUnaryConversions(lex); 1800 UsualUnaryConversions(rex); 1801 QualType condT = cond->getType(); 1802 QualType lexT = lex->getType(); 1803 QualType rexT = rex->getType(); 1804 1805 // first, check the condition. 1806 if (!cond->isTypeDependent()) { 1807 if (!condT->isScalarType()) { // C99 6.5.15p2 1808 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar) << condT; 1809 return QualType(); 1810 } 1811 } 1812 1813 // Now check the two expressions. 1814 if ((lex && lex->isTypeDependent()) || (rex && rex->isTypeDependent())) 1815 return Context.DependentTy; 1816 1817 // If both operands have arithmetic type, do the usual arithmetic conversions 1818 // to find a common type: C99 6.5.15p3,5. 1819 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1820 UsualArithmeticConversions(lex, rex); 1821 return lex->getType(); 1822 } 1823 1824 // If both operands are the same structure or union type, the result is that 1825 // type. 1826 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1827 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1828 if (LHSRT->getDecl() == RHSRT->getDecl()) 1829 // "If both the operands have structure or union type, the result has 1830 // that type." This implies that CV qualifiers are dropped. 1831 return lexT.getUnqualifiedType(); 1832 } 1833 1834 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1835 // The following || allows only one side to be void (a GCC-ism). 1836 if (lexT->isVoidType() || rexT->isVoidType()) { 1837 if (!lexT->isVoidType()) 1838 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void) 1839 << rex->getSourceRange(); 1840 if (!rexT->isVoidType()) 1841 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void) 1842 << lex->getSourceRange(); 1843 ImpCastExprToType(lex, Context.VoidTy); 1844 ImpCastExprToType(rex, Context.VoidTy); 1845 return Context.VoidTy; 1846 } 1847 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1848 // the type of the other operand." 1849 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1850 Context.isObjCObjectPointerType(lexT)) && 1851 rex->isNullPointerConstant(Context)) { 1852 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1853 return lexT; 1854 } 1855 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1856 Context.isObjCObjectPointerType(rexT)) && 1857 lex->isNullPointerConstant(Context)) { 1858 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1859 return rexT; 1860 } 1861 // Handle the case where both operands are pointers before we handle null 1862 // pointer constants in case both operands are null pointer constants. 1863 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1864 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1865 // get the "pointed to" types 1866 QualType lhptee = LHSPT->getPointeeType(); 1867 QualType rhptee = RHSPT->getPointeeType(); 1868 1869 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1870 if (lhptee->isVoidType() && 1871 rhptee->isIncompleteOrObjectType()) { 1872 // Figure out necessary qualifiers (C99 6.5.15p6) 1873 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1874 QualType destType = Context.getPointerType(destPointee); 1875 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1876 ImpCastExprToType(rex, destType); // promote to void* 1877 return destType; 1878 } 1879 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1880 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1881 QualType destType = Context.getPointerType(destPointee); 1882 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1883 ImpCastExprToType(rex, destType); // promote to void* 1884 return destType; 1885 } 1886 1887 QualType compositeType = lexT; 1888 1889 // If either type is an Objective-C object type then check 1890 // compatibility according to Objective-C. 1891 if (Context.isObjCObjectPointerType(lexT) || 1892 Context.isObjCObjectPointerType(rexT)) { 1893 // If both operands are interfaces and either operand can be 1894 // assigned to the other, use that type as the composite 1895 // type. This allows 1896 // xxx ? (A*) a : (B*) b 1897 // where B is a subclass of A. 1898 // 1899 // Additionally, as for assignment, if either type is 'id' 1900 // allow silent coercion. Finally, if the types are 1901 // incompatible then make sure to use 'id' as the composite 1902 // type so the result is acceptable for sending messages to. 1903 1904 // FIXME: This code should not be localized to here. Also this 1905 // should use a compatible check instead of abusing the 1906 // canAssignObjCInterfaces code. 1907 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1908 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1909 if (LHSIface && RHSIface && 1910 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1911 compositeType = lexT; 1912 } else if (LHSIface && RHSIface && 1913 Context.canAssignObjCInterfaces(RHSIface, LHSIface)) { 1914 compositeType = rexT; 1915 } else if (Context.isObjCIdType(lhptee) || 1916 Context.isObjCIdType(rhptee)) { 1917 // FIXME: This code looks wrong, because isObjCIdType checks 1918 // the struct but getObjCIdType returns the pointer to 1919 // struct. This is horrible and should be fixed. 1920 compositeType = Context.getObjCIdType(); 1921 } else { 1922 QualType incompatTy = Context.getObjCIdType(); 1923 ImpCastExprToType(lex, incompatTy); 1924 ImpCastExprToType(rex, incompatTy); 1925 return incompatTy; 1926 } 1927 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1928 rhptee.getUnqualifiedType())) { 1929 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers) 1930 << lexT << rexT << lex->getSourceRange() << rex->getSourceRange(); 1931 // In this situation, we assume void* type. No especially good 1932 // reason, but this is what gcc does, and we do have to pick 1933 // to get a consistent AST. 1934 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1935 ImpCastExprToType(lex, incompatTy); 1936 ImpCastExprToType(rex, incompatTy); 1937 return incompatTy; 1938 } 1939 // The pointer types are compatible. 1940 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1941 // differently qualified versions of compatible types, the result type is 1942 // a pointer to an appropriately qualified version of the *composite* 1943 // type. 1944 // FIXME: Need to calculate the composite type. 1945 // FIXME: Need to add qualifiers 1946 ImpCastExprToType(lex, compositeType); 1947 ImpCastExprToType(rex, compositeType); 1948 return compositeType; 1949 } 1950 } 1951 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1952 // evaluates to "struct objc_object *" (and is handled above when comparing 1953 // id with statically typed objects). 1954 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1955 // GCC allows qualified id and any Objective-C type to devolve to 1956 // id. Currently localizing to here until clear this should be 1957 // part of ObjCQualifiedIdTypesAreCompatible. 1958 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1959 (lexT->isObjCQualifiedIdType() && 1960 Context.isObjCObjectPointerType(rexT)) || 1961 (rexT->isObjCQualifiedIdType() && 1962 Context.isObjCObjectPointerType(lexT))) { 1963 // FIXME: This is not the correct composite type. This only 1964 // happens to work because id can more or less be used anywhere, 1965 // however this may change the type of method sends. 1966 // FIXME: gcc adds some type-checking of the arguments and emits 1967 // (confusing) incompatible comparison warnings in some 1968 // cases. Investigate. 1969 QualType compositeType = Context.getObjCIdType(); 1970 ImpCastExprToType(lex, compositeType); 1971 ImpCastExprToType(rex, compositeType); 1972 return compositeType; 1973 } 1974 } 1975 1976 // Selection between block pointer types is ok as long as they are the same. 1977 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1978 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1979 return lexT; 1980 1981 // Otherwise, the operands are not compatible. 1982 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands) 1983 << lexT << rexT << lex->getSourceRange() << rex->getSourceRange(); 1984 return QualType(); 1985} 1986 1987/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1988/// in the case of a the GNU conditional expr extension. 1989Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1990 SourceLocation ColonLoc, 1991 ExprTy *Cond, ExprTy *LHS, 1992 ExprTy *RHS) { 1993 Expr *CondExpr = (Expr *) Cond; 1994 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1995 1996 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1997 // was the condition. 1998 bool isLHSNull = LHSExpr == 0; 1999 if (isLHSNull) 2000 LHSExpr = CondExpr; 2001 2002 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 2003 RHSExpr, QuestionLoc); 2004 if (result.isNull()) 2005 return true; 2006 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 2007 RHSExpr, result); 2008} 2009 2010 2011// CheckPointerTypesForAssignment - This is a very tricky routine (despite 2012// being closely modeled after the C99 spec:-). The odd characteristic of this 2013// routine is it effectively iqnores the qualifiers on the top level pointee. 2014// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 2015// FIXME: add a couple examples in this comment. 2016Sema::AssignConvertType 2017Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 2018 QualType lhptee, rhptee; 2019 2020 // get the "pointed to" type (ignoring qualifiers at the top level) 2021 lhptee = lhsType->getAsPointerType()->getPointeeType(); 2022 rhptee = rhsType->getAsPointerType()->getPointeeType(); 2023 2024 // make sure we operate on the canonical type 2025 lhptee = Context.getCanonicalType(lhptee); 2026 rhptee = Context.getCanonicalType(rhptee); 2027 2028 AssignConvertType ConvTy = Compatible; 2029 2030 // C99 6.5.16.1p1: This following citation is common to constraints 2031 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 2032 // qualifiers of the type *pointed to* by the right; 2033 // FIXME: Handle ASQualType 2034 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 2035 ConvTy = CompatiblePointerDiscardsQualifiers; 2036 2037 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 2038 // incomplete type and the other is a pointer to a qualified or unqualified 2039 // version of void... 2040 if (lhptee->isVoidType()) { 2041 if (rhptee->isIncompleteOrObjectType()) 2042 return ConvTy; 2043 2044 // As an extension, we allow cast to/from void* to function pointer. 2045 assert(rhptee->isFunctionType()); 2046 return FunctionVoidPointer; 2047 } 2048 2049 if (rhptee->isVoidType()) { 2050 if (lhptee->isIncompleteOrObjectType()) 2051 return ConvTy; 2052 2053 // As an extension, we allow cast to/from void* to function pointer. 2054 assert(lhptee->isFunctionType()); 2055 return FunctionVoidPointer; 2056 } 2057 2058 // Check for ObjC interfaces 2059 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 2060 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 2061 if (LHSIface && RHSIface && 2062 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 2063 return ConvTy; 2064 2065 // ID acts sort of like void* for ObjC interfaces 2066 if (LHSIface && Context.isObjCIdType(rhptee)) 2067 return ConvTy; 2068 if (RHSIface && Context.isObjCIdType(lhptee)) 2069 return ConvTy; 2070 2071 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 2072 // unqualified versions of compatible types, ... 2073 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 2074 rhptee.getUnqualifiedType())) 2075 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 2076 return ConvTy; 2077} 2078 2079/// CheckBlockPointerTypesForAssignment - This routine determines whether two 2080/// block pointer types are compatible or whether a block and normal pointer 2081/// are compatible. It is more restrict than comparing two function pointer 2082// types. 2083Sema::AssignConvertType 2084Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 2085 QualType rhsType) { 2086 QualType lhptee, rhptee; 2087 2088 // get the "pointed to" type (ignoring qualifiers at the top level) 2089 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 2090 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 2091 2092 // make sure we operate on the canonical type 2093 lhptee = Context.getCanonicalType(lhptee); 2094 rhptee = Context.getCanonicalType(rhptee); 2095 2096 AssignConvertType ConvTy = Compatible; 2097 2098 // For blocks we enforce that qualifiers are identical. 2099 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 2100 ConvTy = CompatiblePointerDiscardsQualifiers; 2101 2102 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 2103 return IncompatibleBlockPointer; 2104 return ConvTy; 2105} 2106 2107/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 2108/// has code to accommodate several GCC extensions when type checking 2109/// pointers. Here are some objectionable examples that GCC considers warnings: 2110/// 2111/// int a, *pint; 2112/// short *pshort; 2113/// struct foo *pfoo; 2114/// 2115/// pint = pshort; // warning: assignment from incompatible pointer type 2116/// a = pint; // warning: assignment makes integer from pointer without a cast 2117/// pint = a; // warning: assignment makes pointer from integer without a cast 2118/// pint = pfoo; // warning: assignment from incompatible pointer type 2119/// 2120/// As a result, the code for dealing with pointers is more complex than the 2121/// C99 spec dictates. 2122/// 2123Sema::AssignConvertType 2124Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 2125 // Get canonical types. We're not formatting these types, just comparing 2126 // them. 2127 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 2128 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 2129 2130 if (lhsType == rhsType) 2131 return Compatible; // Common case: fast path an exact match. 2132 2133 // If the left-hand side is a reference type, then we are in a 2134 // (rare!) case where we've allowed the use of references in C, 2135 // e.g., as a parameter type in a built-in function. In this case, 2136 // just make sure that the type referenced is compatible with the 2137 // right-hand side type. The caller is responsible for adjusting 2138 // lhsType so that the resulting expression does not have reference 2139 // type. 2140 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 2141 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 2142 return Compatible; 2143 return Incompatible; 2144 } 2145 2146 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 2147 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 2148 return Compatible; 2149 // Relax integer conversions like we do for pointers below. 2150 if (rhsType->isIntegerType()) 2151 return IntToPointer; 2152 if (lhsType->isIntegerType()) 2153 return PointerToInt; 2154 return IncompatibleObjCQualifiedId; 2155 } 2156 2157 if (lhsType->isVectorType() || rhsType->isVectorType()) { 2158 // For ExtVector, allow vector splats; float -> <n x float> 2159 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 2160 if (LV->getElementType() == rhsType) 2161 return Compatible; 2162 2163 // If we are allowing lax vector conversions, and LHS and RHS are both 2164 // vectors, the total size only needs to be the same. This is a bitcast; 2165 // no bits are changed but the result type is different. 2166 if (getLangOptions().LaxVectorConversions && 2167 lhsType->isVectorType() && rhsType->isVectorType()) { 2168 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 2169 return Compatible; 2170 } 2171 return Incompatible; 2172 } 2173 2174 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 2175 return Compatible; 2176 2177 if (isa<PointerType>(lhsType)) { 2178 if (rhsType->isIntegerType()) 2179 return IntToPointer; 2180 2181 if (isa<PointerType>(rhsType)) 2182 return CheckPointerTypesForAssignment(lhsType, rhsType); 2183 2184 if (rhsType->getAsBlockPointerType()) { 2185 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2186 return Compatible; 2187 2188 // Treat block pointers as objects. 2189 if (getLangOptions().ObjC1 && 2190 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 2191 return Compatible; 2192 } 2193 return Incompatible; 2194 } 2195 2196 if (isa<BlockPointerType>(lhsType)) { 2197 if (rhsType->isIntegerType()) 2198 return IntToPointer; 2199 2200 // Treat block pointers as objects. 2201 if (getLangOptions().ObjC1 && 2202 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 2203 return Compatible; 2204 2205 if (rhsType->isBlockPointerType()) 2206 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 2207 2208 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 2209 if (RHSPT->getPointeeType()->isVoidType()) 2210 return Compatible; 2211 } 2212 return Incompatible; 2213 } 2214 2215 if (isa<PointerType>(rhsType)) { 2216 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 2217 if (lhsType == Context.BoolTy) 2218 return Compatible; 2219 2220 if (lhsType->isIntegerType()) 2221 return PointerToInt; 2222 2223 if (isa<PointerType>(lhsType)) 2224 return CheckPointerTypesForAssignment(lhsType, rhsType); 2225 2226 if (isa<BlockPointerType>(lhsType) && 2227 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 2228 return Compatible; 2229 return Incompatible; 2230 } 2231 2232 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 2233 if (Context.typesAreCompatible(lhsType, rhsType)) 2234 return Compatible; 2235 } 2236 return Incompatible; 2237} 2238 2239Sema::AssignConvertType 2240Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 2241 if (getLangOptions().CPlusPlus) { 2242 if (!lhsType->isRecordType()) { 2243 // C++ 5.17p3: If the left operand is not of class type, the 2244 // expression is implicitly converted (C++ 4) to the 2245 // cv-unqualified type of the left operand. 2246 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType(), 2247 "assigning")) 2248 return Incompatible; 2249 else 2250 return Compatible; 2251 } 2252 2253 // FIXME: Currently, we fall through and treat C++ classes like C 2254 // structures. 2255 } 2256 2257 // C99 6.5.16.1p1: the left operand is a pointer and the right is 2258 // a null pointer constant. 2259 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 2260 lhsType->isBlockPointerType()) 2261 && rExpr->isNullPointerConstant(Context)) { 2262 ImpCastExprToType(rExpr, lhsType); 2263 return Compatible; 2264 } 2265 2266 // We don't allow conversion of non-null-pointer constants to integers. 2267 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 2268 return IntToBlockPointer; 2269 2270 // This check seems unnatural, however it is necessary to ensure the proper 2271 // conversion of functions/arrays. If the conversion were done for all 2272 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 2273 // expressions that surpress this implicit conversion (&, sizeof). 2274 // 2275 // Suppress this for references: C++ 8.5.3p5. 2276 if (!lhsType->isReferenceType()) 2277 DefaultFunctionArrayConversion(rExpr); 2278 2279 Sema::AssignConvertType result = 2280 CheckAssignmentConstraints(lhsType, rExpr->getType()); 2281 2282 // C99 6.5.16.1p2: The value of the right operand is converted to the 2283 // type of the assignment expression. 2284 // CheckAssignmentConstraints allows the left-hand side to be a reference, 2285 // so that we can use references in built-in functions even in C. 2286 // The getNonReferenceType() call makes sure that the resulting expression 2287 // does not have reference type. 2288 if (rExpr->getType() != lhsType) 2289 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 2290 return result; 2291} 2292 2293Sema::AssignConvertType 2294Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 2295 return CheckAssignmentConstraints(lhsType, rhsType); 2296} 2297 2298QualType Sema::InvalidOperands(SourceLocation Loc, Expr *&lex, Expr *&rex) { 2299 Diag(Loc, diag::err_typecheck_invalid_operands) 2300 << lex->getType() << rex->getType() 2301 << lex->getSourceRange() << rex->getSourceRange(); 2302 return QualType(); 2303} 2304 2305inline QualType Sema::CheckVectorOperands(SourceLocation Loc, Expr *&lex, 2306 Expr *&rex) { 2307 // For conversion purposes, we ignore any qualifiers. 2308 // For example, "const float" and "float" are equivalent. 2309 QualType lhsType = 2310 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 2311 QualType rhsType = 2312 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 2313 2314 // If the vector types are identical, return. 2315 if (lhsType == rhsType) 2316 return lhsType; 2317 2318 // Handle the case of a vector & extvector type of the same size and element 2319 // type. It would be nice if we only had one vector type someday. 2320 if (getLangOptions().LaxVectorConversions) 2321 if (const VectorType *LV = lhsType->getAsVectorType()) 2322 if (const VectorType *RV = rhsType->getAsVectorType()) 2323 if (LV->getElementType() == RV->getElementType() && 2324 LV->getNumElements() == RV->getNumElements()) 2325 return lhsType->isExtVectorType() ? lhsType : rhsType; 2326 2327 // If the lhs is an extended vector and the rhs is a scalar of the same type 2328 // or a literal, promote the rhs to the vector type. 2329 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 2330 QualType eltType = V->getElementType(); 2331 2332 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 2333 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 2334 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 2335 ImpCastExprToType(rex, lhsType); 2336 return lhsType; 2337 } 2338 } 2339 2340 // If the rhs is an extended vector and the lhs is a scalar of the same type, 2341 // promote the lhs to the vector type. 2342 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 2343 QualType eltType = V->getElementType(); 2344 2345 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 2346 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 2347 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 2348 ImpCastExprToType(lex, rhsType); 2349 return rhsType; 2350 } 2351 } 2352 2353 // You cannot convert between vector values of different size. 2354 Diag(Loc, diag::err_typecheck_vector_not_convertable) 2355 << lex->getType() << rex->getType() 2356 << lex->getSourceRange() << rex->getSourceRange(); 2357 return QualType(); 2358} 2359 2360inline QualType Sema::CheckMultiplyDivideOperands( 2361 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2362{ 2363 QualType lhsType = lex->getType(), rhsType = rex->getType(); 2364 2365 if (lhsType->isVectorType() || rhsType->isVectorType()) 2366 return CheckVectorOperands(Loc, lex, rex); 2367 2368 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2369 2370 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2371 return compType; 2372 return InvalidOperands(Loc, lex, rex); 2373} 2374 2375inline QualType Sema::CheckRemainderOperands( 2376 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2377{ 2378 QualType lhsType = lex->getType(), rhsType = rex->getType(); 2379 2380 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2381 2382 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2383 return compType; 2384 return InvalidOperands(Loc, lex, rex); 2385} 2386 2387inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 2388 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2389{ 2390 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2391 return CheckVectorOperands(Loc, lex, rex); 2392 2393 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2394 2395 // handle the common case first (both operands are arithmetic). 2396 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2397 return compType; 2398 2399 // Put any potential pointer into PExp 2400 Expr* PExp = lex, *IExp = rex; 2401 if (IExp->getType()->isPointerType()) 2402 std::swap(PExp, IExp); 2403 2404 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 2405 if (IExp->getType()->isIntegerType()) { 2406 // Check for arithmetic on pointers to incomplete types 2407 if (!PTy->getPointeeType()->isObjectType()) { 2408 if (PTy->getPointeeType()->isVoidType()) { 2409 Diag(Loc, diag::ext_gnu_void_ptr) 2410 << lex->getSourceRange() << rex->getSourceRange(); 2411 } else { 2412 Diag(Loc, diag::err_typecheck_arithmetic_incomplete_type) 2413 << lex->getType() << lex->getSourceRange(); 2414 return QualType(); 2415 } 2416 } 2417 return PExp->getType(); 2418 } 2419 } 2420 2421 return InvalidOperands(Loc, lex, rex); 2422} 2423 2424// C99 6.5.6 2425QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 2426 SourceLocation Loc, bool isCompAssign) { 2427 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2428 return CheckVectorOperands(Loc, lex, rex); 2429 2430 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2431 2432 // Enforce type constraints: C99 6.5.6p3. 2433 2434 // Handle the common case first (both operands are arithmetic). 2435 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2436 return compType; 2437 2438 // Either ptr - int or ptr - ptr. 2439 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 2440 QualType lpointee = LHSPTy->getPointeeType(); 2441 2442 // The LHS must be an object type, not incomplete, function, etc. 2443 if (!lpointee->isObjectType()) { 2444 // Handle the GNU void* extension. 2445 if (lpointee->isVoidType()) { 2446 Diag(Loc, diag::ext_gnu_void_ptr) 2447 << lex->getSourceRange() << rex->getSourceRange(); 2448 } else { 2449 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2450 << lex->getType() << lex->getSourceRange(); 2451 return QualType(); 2452 } 2453 } 2454 2455 // The result type of a pointer-int computation is the pointer type. 2456 if (rex->getType()->isIntegerType()) 2457 return lex->getType(); 2458 2459 // Handle pointer-pointer subtractions. 2460 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 2461 QualType rpointee = RHSPTy->getPointeeType(); 2462 2463 // RHS must be an object type, unless void (GNU). 2464 if (!rpointee->isObjectType()) { 2465 // Handle the GNU void* extension. 2466 if (rpointee->isVoidType()) { 2467 if (!lpointee->isVoidType()) 2468 Diag(Loc, diag::ext_gnu_void_ptr) 2469 << lex->getSourceRange() << rex->getSourceRange(); 2470 } else { 2471 Diag(Loc, diag::err_typecheck_sub_ptr_object) 2472 << rex->getType() << rex->getSourceRange(); 2473 return QualType(); 2474 } 2475 } 2476 2477 // Pointee types must be compatible. 2478 if (!Context.typesAreCompatible( 2479 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2480 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2481 Diag(Loc, diag::err_typecheck_sub_ptr_compatible) 2482 << lex->getType() << rex->getType() 2483 << lex->getSourceRange() << rex->getSourceRange(); 2484 return QualType(); 2485 } 2486 2487 return Context.getPointerDiffType(); 2488 } 2489 } 2490 2491 return InvalidOperands(Loc, lex, rex); 2492} 2493 2494// C99 6.5.7 2495QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2496 bool isCompAssign) { 2497 // C99 6.5.7p2: Each of the operands shall have integer type. 2498 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2499 return InvalidOperands(Loc, lex, rex); 2500 2501 // Shifts don't perform usual arithmetic conversions, they just do integer 2502 // promotions on each operand. C99 6.5.7p3 2503 if (!isCompAssign) 2504 UsualUnaryConversions(lex); 2505 UsualUnaryConversions(rex); 2506 2507 // "The type of the result is that of the promoted left operand." 2508 return lex->getType(); 2509} 2510 2511static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 2512 ASTContext& Context) { 2513 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2514 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2515 // ID acts sort of like void* for ObjC interfaces 2516 if (LHSIface && Context.isObjCIdType(RHS)) 2517 return true; 2518 if (RHSIface && Context.isObjCIdType(LHS)) 2519 return true; 2520 if (!LHSIface || !RHSIface) 2521 return false; 2522 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 2523 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 2524} 2525 2526// C99 6.5.8 2527QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation Loc, 2528 bool isRelational) { 2529 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2530 return CheckVectorCompareOperands(lex, rex, Loc, isRelational); 2531 2532 // C99 6.5.8p3 / C99 6.5.9p4 2533 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2534 UsualArithmeticConversions(lex, rex); 2535 else { 2536 UsualUnaryConversions(lex); 2537 UsualUnaryConversions(rex); 2538 } 2539 QualType lType = lex->getType(); 2540 QualType rType = rex->getType(); 2541 2542 // For non-floating point types, check for self-comparisons of the form 2543 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2544 // often indicate logic errors in the program. 2545 if (!lType->isFloatingType()) { 2546 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2547 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2548 if (DRL->getDecl() == DRR->getDecl()) 2549 Diag(Loc, diag::warn_selfcomparison); 2550 } 2551 2552 // The result of comparisons is 'bool' in C++, 'int' in C. 2553 QualType ResultTy = getLangOptions().CPlusPlus? Context.BoolTy : Context.IntTy; 2554 2555 if (isRelational) { 2556 if (lType->isRealType() && rType->isRealType()) 2557 return ResultTy; 2558 } else { 2559 // Check for comparisons of floating point operands using != and ==. 2560 if (lType->isFloatingType()) { 2561 assert (rType->isFloatingType()); 2562 CheckFloatComparison(Loc,lex,rex); 2563 } 2564 2565 if (lType->isArithmeticType() && rType->isArithmeticType()) 2566 return ResultTy; 2567 } 2568 2569 bool LHSIsNull = lex->isNullPointerConstant(Context); 2570 bool RHSIsNull = rex->isNullPointerConstant(Context); 2571 2572 // All of the following pointer related warnings are GCC extensions, except 2573 // when handling null pointer constants. One day, we can consider making them 2574 // errors (when -pedantic-errors is enabled). 2575 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2576 QualType LCanPointeeTy = 2577 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2578 QualType RCanPointeeTy = 2579 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2580 2581 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2582 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2583 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2584 RCanPointeeTy.getUnqualifiedType()) && 2585 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2586 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2587 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2588 } 2589 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2590 return ResultTy; 2591 } 2592 // Handle block pointer types. 2593 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2594 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2595 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2596 2597 if (!LHSIsNull && !RHSIsNull && 2598 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2599 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2600 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2601 } 2602 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2603 return ResultTy; 2604 } 2605 // Allow block pointers to be compared with null pointer constants. 2606 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2607 (lType->isPointerType() && rType->isBlockPointerType())) { 2608 if (!LHSIsNull && !RHSIsNull) { 2609 Diag(Loc, diag::err_typecheck_comparison_of_distinct_blocks) 2610 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2611 } 2612 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2613 return ResultTy; 2614 } 2615 2616 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2617 if (lType->isPointerType() || rType->isPointerType()) { 2618 const PointerType *LPT = lType->getAsPointerType(); 2619 const PointerType *RPT = rType->getAsPointerType(); 2620 bool LPtrToVoid = LPT ? 2621 Context.getCanonicalType(LPT->getPointeeType())->isVoidType() : false; 2622 bool RPtrToVoid = RPT ? 2623 Context.getCanonicalType(RPT->getPointeeType())->isVoidType() : false; 2624 2625 if (!LPtrToVoid && !RPtrToVoid && 2626 !Context.typesAreCompatible(lType, rType)) { 2627 Diag(Loc, diag::ext_typecheck_comparison_of_distinct_pointers) 2628 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2629 ImpCastExprToType(rex, lType); 2630 return ResultTy; 2631 } 2632 ImpCastExprToType(rex, lType); 2633 return ResultTy; 2634 } 2635 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2636 ImpCastExprToType(rex, lType); 2637 return ResultTy; 2638 } else { 2639 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2640 Diag(Loc, diag::warn_incompatible_qualified_id_operands) 2641 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2642 ImpCastExprToType(rex, lType); 2643 return ResultTy; 2644 } 2645 } 2646 } 2647 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2648 rType->isIntegerType()) { 2649 if (!RHSIsNull) 2650 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2651 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2652 ImpCastExprToType(rex, lType); // promote the integer to pointer 2653 return ResultTy; 2654 } 2655 if (lType->isIntegerType() && 2656 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2657 if (!LHSIsNull) 2658 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2659 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2660 ImpCastExprToType(lex, rType); // promote the integer to pointer 2661 return ResultTy; 2662 } 2663 // Handle block pointers. 2664 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2665 if (!RHSIsNull) 2666 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2667 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2668 ImpCastExprToType(rex, lType); // promote the integer to pointer 2669 return ResultTy; 2670 } 2671 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2672 if (!LHSIsNull) 2673 Diag(Loc, diag::ext_typecheck_comparison_of_pointer_integer) 2674 << lType << rType << lex->getSourceRange() << rex->getSourceRange(); 2675 ImpCastExprToType(lex, rType); // promote the integer to pointer 2676 return ResultTy; 2677 } 2678 return InvalidOperands(Loc, lex, rex); 2679} 2680 2681/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2682/// operates on extended vector types. Instead of producing an IntTy result, 2683/// like a scalar comparison, a vector comparison produces a vector of integer 2684/// types. 2685QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2686 SourceLocation Loc, 2687 bool isRelational) { 2688 // Check to make sure we're operating on vectors of the same type and width, 2689 // Allowing one side to be a scalar of element type. 2690 QualType vType = CheckVectorOperands(Loc, lex, rex); 2691 if (vType.isNull()) 2692 return vType; 2693 2694 QualType lType = lex->getType(); 2695 QualType rType = rex->getType(); 2696 2697 // For non-floating point types, check for self-comparisons of the form 2698 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2699 // often indicate logic errors in the program. 2700 if (!lType->isFloatingType()) { 2701 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2702 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2703 if (DRL->getDecl() == DRR->getDecl()) 2704 Diag(Loc, diag::warn_selfcomparison); 2705 } 2706 2707 // Check for comparisons of floating point operands using != and ==. 2708 if (!isRelational && lType->isFloatingType()) { 2709 assert (rType->isFloatingType()); 2710 CheckFloatComparison(Loc,lex,rex); 2711 } 2712 2713 // Return the type for the comparison, which is the same as vector type for 2714 // integer vectors, or an integer type of identical size and number of 2715 // elements for floating point vectors. 2716 if (lType->isIntegerType()) 2717 return lType; 2718 2719 const VectorType *VTy = lType->getAsVectorType(); 2720 2721 // FIXME: need to deal with non-32b int / non-64b long long 2722 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2723 if (TypeSize == 32) { 2724 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2725 } 2726 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2727 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2728} 2729 2730inline QualType Sema::CheckBitwiseOperands( 2731 Expr *&lex, Expr *&rex, SourceLocation Loc, bool isCompAssign) 2732{ 2733 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2734 return CheckVectorOperands(Loc, lex, rex); 2735 2736 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2737 2738 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2739 return compType; 2740 return InvalidOperands(Loc, lex, rex); 2741} 2742 2743inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2744 Expr *&lex, Expr *&rex, SourceLocation Loc) 2745{ 2746 UsualUnaryConversions(lex); 2747 UsualUnaryConversions(rex); 2748 2749 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2750 return Context.IntTy; 2751 return InvalidOperands(Loc, lex, rex); 2752} 2753 2754/// CheckForModifiableLvalue - Verify that E is a modifiable lvalue. If not, 2755/// emit an error and return true. If so, return false. 2756static bool CheckForModifiableLvalue(Expr *E, SourceLocation Loc, Sema &S) { 2757 Expr::isModifiableLvalueResult IsLV = E->isModifiableLvalue(S.Context); 2758 if (IsLV == Expr::MLV_Valid) 2759 return false; 2760 2761 unsigned Diag = 0; 2762 bool NeedType = false; 2763 switch (IsLV) { // C99 6.5.16p2 2764 default: assert(0 && "Unknown result from isModifiableLvalue!"); 2765 case Expr::MLV_ConstQualified: Diag = diag::err_typecheck_assign_const; break; 2766 case Expr::MLV_ArrayType: 2767 Diag = diag::err_typecheck_array_not_modifiable_lvalue; 2768 NeedType = true; 2769 break; 2770 case Expr::MLV_NotObjectType: 2771 Diag = diag::err_typecheck_non_object_not_modifiable_lvalue; 2772 NeedType = true; 2773 break; 2774 case Expr::MLV_LValueCast: 2775 Diag = diag::err_typecheck_lvalue_casts_not_supported; 2776 break; 2777 case Expr::MLV_InvalidExpression: 2778 Diag = diag::err_typecheck_expression_not_modifiable_lvalue; 2779 break; 2780 case Expr::MLV_IncompleteType: 2781 case Expr::MLV_IncompleteVoidType: 2782 Diag = diag::err_typecheck_incomplete_type_not_modifiable_lvalue; 2783 NeedType = true; 2784 break; 2785 case Expr::MLV_DuplicateVectorComponents: 2786 Diag = diag::err_typecheck_duplicate_vector_components_not_mlvalue; 2787 break; 2788 case Expr::MLV_NotBlockQualified: 2789 Diag = diag::err_block_decl_ref_not_modifiable_lvalue; 2790 break; 2791 case Expr::MLV_ReadonlyProperty: 2792 Diag = diag::error_readonly_property_assignment; 2793 break; 2794 case Expr::MLV_NoSetterProperty: 2795 Diag = diag::error_nosetter_property_assignment; 2796 break; 2797 } 2798 2799 if (NeedType) 2800 S.Diag(Loc, Diag) << E->getType() << E->getSourceRange(); 2801 else 2802 S.Diag(Loc, Diag) << E->getSourceRange(); 2803 return true; 2804} 2805 2806 2807 2808// C99 6.5.16.1 2809QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS, 2810 SourceLocation Loc, 2811 QualType CompoundType) { 2812 // Verify that LHS is a modifiable lvalue, and emit error if not. 2813 if (CheckForModifiableLvalue(LHS, Loc, *this)) 2814 return QualType(); 2815 2816 QualType LHSType = LHS->getType(); 2817 QualType RHSType = CompoundType.isNull() ? RHS->getType() : CompoundType; 2818 2819 AssignConvertType ConvTy; 2820 if (CompoundType.isNull()) { 2821 // Simple assignment "x = y". 2822 ConvTy = CheckSingleAssignmentConstraints(LHSType, RHS); 2823 2824 // If the RHS is a unary plus or minus, check to see if they = and + are 2825 // right next to each other. If so, the user may have typo'd "x =+ 4" 2826 // instead of "x += 4". 2827 Expr *RHSCheck = RHS; 2828 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2829 RHSCheck = ICE->getSubExpr(); 2830 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2831 if ((UO->getOpcode() == UnaryOperator::Plus || 2832 UO->getOpcode() == UnaryOperator::Minus) && 2833 Loc.isFileID() && UO->getOperatorLoc().isFileID() && 2834 // Only if the two operators are exactly adjacent. 2835 Loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2836 Diag(Loc, diag::warn_not_compound_assign) 2837 << (UO->getOpcode() == UnaryOperator::Plus ? "+" : "-") 2838 << SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc()); 2839 } 2840 } else { 2841 // Compound assignment "x += y" 2842 ConvTy = CheckCompoundAssignmentConstraints(LHSType, RHSType); 2843 } 2844 2845 if (DiagnoseAssignmentResult(ConvTy, Loc, LHSType, RHSType, 2846 RHS, "assigning")) 2847 return QualType(); 2848 2849 // C99 6.5.16p3: The type of an assignment expression is the type of the 2850 // left operand unless the left operand has qualified type, in which case 2851 // it is the unqualified version of the type of the left operand. 2852 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2853 // is converted to the type of the assignment expression (above). 2854 // C++ 5.17p1: the type of the assignment expression is that of its left 2855 // oprdu. 2856 return LHSType.getUnqualifiedType(); 2857} 2858 2859// C99 6.5.17 2860QualType Sema::CheckCommaOperands(Expr *LHS, Expr *&RHS, SourceLocation Loc) { 2861 // FIXME: what is required for LHS? 2862 2863 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2864 DefaultFunctionArrayConversion(RHS); 2865 return RHS->getType(); 2866} 2867 2868/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2869/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2870QualType Sema::CheckIncrementDecrementOperand(Expr *Op, SourceLocation OpLoc, 2871 bool isInc) { 2872 QualType ResType = Op->getType(); 2873 assert(!ResType.isNull() && "no type for increment/decrement expression"); 2874 2875 if (getLangOptions().CPlusPlus && ResType->isBooleanType()) { 2876 // Decrement of bool is not allowed. 2877 if (!isInc) { 2878 Diag(OpLoc, diag::err_decrement_bool) << Op->getSourceRange(); 2879 return QualType(); 2880 } 2881 // Increment of bool sets it to true, but is deprecated. 2882 Diag(OpLoc, diag::warn_increment_bool) << Op->getSourceRange(); 2883 } else if (ResType->isRealType()) { 2884 // OK! 2885 } else if (const PointerType *PT = ResType->getAsPointerType()) { 2886 // C99 6.5.2.4p2, 6.5.6p2 2887 if (PT->getPointeeType()->isObjectType()) { 2888 // Pointer to object is ok! 2889 } else if (PT->getPointeeType()->isVoidType()) { 2890 // Pointer to void is extension. 2891 Diag(OpLoc, diag::ext_gnu_void_ptr) << Op->getSourceRange(); 2892 } else { 2893 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type) 2894 << ResType << Op->getSourceRange(); 2895 return QualType(); 2896 } 2897 } else if (ResType->isComplexType()) { 2898 // C99 does not support ++/-- on complex types, we allow as an extension. 2899 Diag(OpLoc, diag::ext_integer_increment_complex) 2900 << ResType << Op->getSourceRange(); 2901 } else { 2902 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement) 2903 << ResType << Op->getSourceRange(); 2904 return QualType(); 2905 } 2906 // At this point, we know we have a real, complex or pointer type. 2907 // Now make sure the operand is a modifiable lvalue. 2908 if (CheckForModifiableLvalue(Op, OpLoc, *this)) 2909 return QualType(); 2910 return ResType; 2911} 2912 2913/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2914/// This routine allows us to typecheck complex/recursive expressions 2915/// where the declaration is needed for type checking. We only need to 2916/// handle cases when the expression references a function designator 2917/// or is an lvalue. Here are some examples: 2918/// - &(x) => x 2919/// - &*****f => f for f a function designator. 2920/// - &s.xx => s 2921/// - &s.zz[1].yy -> s, if zz is an array 2922/// - *(x + 1) -> x, if x is an array 2923/// - &"123"[2] -> 0 2924/// - & __real__ x -> x 2925static NamedDecl *getPrimaryDecl(Expr *E) { 2926 switch (E->getStmtClass()) { 2927 case Stmt::DeclRefExprClass: 2928 return cast<DeclRefExpr>(E)->getDecl(); 2929 case Stmt::MemberExprClass: 2930 // Fields cannot be declared with a 'register' storage class. 2931 // &X->f is always ok, even if X is declared register. 2932 if (cast<MemberExpr>(E)->isArrow()) 2933 return 0; 2934 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2935 case Stmt::ArraySubscriptExprClass: { 2936 // &X[4] and &4[X] refers to X if X is not a pointer. 2937 2938 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2939 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 2940 if (!VD || VD->getType()->isPointerType()) 2941 return 0; 2942 else 2943 return VD; 2944 } 2945 case Stmt::UnaryOperatorClass: { 2946 UnaryOperator *UO = cast<UnaryOperator>(E); 2947 2948 switch(UO->getOpcode()) { 2949 case UnaryOperator::Deref: { 2950 // *(X + 1) refers to X if X is not a pointer. 2951 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 2952 ValueDecl *VD = dyn_cast<ValueDecl>(D); 2953 if (!VD || VD->getType()->isPointerType()) 2954 return 0; 2955 return VD; 2956 } 2957 return 0; 2958 } 2959 case UnaryOperator::Real: 2960 case UnaryOperator::Imag: 2961 case UnaryOperator::Extension: 2962 return getPrimaryDecl(UO->getSubExpr()); 2963 default: 2964 return 0; 2965 } 2966 } 2967 case Stmt::BinaryOperatorClass: { 2968 BinaryOperator *BO = cast<BinaryOperator>(E); 2969 2970 // Handle cases involving pointer arithmetic. The result of an 2971 // Assign or AddAssign is not an lvalue so they can be ignored. 2972 2973 // (x + n) or (n + x) => x 2974 if (BO->getOpcode() == BinaryOperator::Add) { 2975 if (BO->getLHS()->getType()->isPointerType()) { 2976 return getPrimaryDecl(BO->getLHS()); 2977 } else if (BO->getRHS()->getType()->isPointerType()) { 2978 return getPrimaryDecl(BO->getRHS()); 2979 } 2980 } 2981 2982 return 0; 2983 } 2984 case Stmt::ParenExprClass: 2985 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2986 case Stmt::ImplicitCastExprClass: 2987 // &X[4] when X is an array, has an implicit cast from array to pointer. 2988 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2989 default: 2990 return 0; 2991 } 2992} 2993 2994/// CheckAddressOfOperand - The operand of & must be either a function 2995/// designator or an lvalue designating an object. If it is an lvalue, the 2996/// object cannot be declared with storage class register or be a bit field. 2997/// Note: The usual conversions are *not* applied to the operand of the & 2998/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2999/// In C++, the operand might be an overloaded function name, in which case 3000/// we allow the '&' but retain the overloaded-function type. 3001QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 3002 if (op->isTypeDependent()) 3003 return Context.DependentTy; 3004 3005 if (getLangOptions().C99) { 3006 // Implement C99-only parts of addressof rules. 3007 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 3008 if (uOp->getOpcode() == UnaryOperator::Deref) 3009 // Per C99 6.5.3.2, the address of a deref always returns a valid result 3010 // (assuming the deref expression is valid). 3011 return uOp->getSubExpr()->getType(); 3012 } 3013 // Technically, there should be a check for array subscript 3014 // expressions here, but the result of one is always an lvalue anyway. 3015 } 3016 NamedDecl *dcl = getPrimaryDecl(op); 3017 Expr::isLvalueResult lval = op->isLvalue(Context); 3018 3019 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 3020 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 3021 // FIXME: emit more specific diag... 3022 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof) 3023 << op->getSourceRange(); 3024 return QualType(); 3025 } 3026 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 3027 if (FieldDecl *Field = dyn_cast<FieldDecl>(MemExpr->getMemberDecl())) { 3028 if (Field->isBitField()) { 3029 Diag(OpLoc, diag::err_typecheck_address_of) 3030 << "bit-field" << op->getSourceRange(); 3031 return QualType(); 3032 } 3033 } 3034 // Check for Apple extension for accessing vector components. 3035 } else if (isa<ArraySubscriptExpr>(op) && 3036 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 3037 Diag(OpLoc, diag::err_typecheck_address_of) 3038 << "vector" << op->getSourceRange(); 3039 return QualType(); 3040 } else if (dcl) { // C99 6.5.3.2p1 3041 // We have an lvalue with a decl. Make sure the decl is not declared 3042 // with the register storage-class specifier. 3043 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 3044 if (vd->getStorageClass() == VarDecl::Register) { 3045 Diag(OpLoc, diag::err_typecheck_address_of) 3046 << "register variable" << op->getSourceRange(); 3047 return QualType(); 3048 } 3049 } else if (isa<OverloadedFunctionDecl>(dcl)) { 3050 return Context.OverloadTy; 3051 } else if (isa<FieldDecl>(dcl)) { 3052 // Okay: we can take the address of a field. 3053 } else if (isa<FunctionDecl>(dcl)) { 3054 // Okay: we can take the address of a function. 3055 } 3056 else 3057 assert(0 && "Unknown/unexpected decl type"); 3058 } 3059 3060 // If the operand has type "type", the result has type "pointer to type". 3061 return Context.getPointerType(op->getType()); 3062} 3063 3064QualType Sema::CheckIndirectionOperand(Expr *Op, SourceLocation OpLoc) { 3065 UsualUnaryConversions(Op); 3066 QualType Ty = Op->getType(); 3067 3068 // Note that per both C89 and C99, this is always legal, even if ptype is an 3069 // incomplete type or void. It would be possible to warn about dereferencing 3070 // a void pointer, but it's completely well-defined, and such a warning is 3071 // unlikely to catch any mistakes. 3072 if (const PointerType *PT = Ty->getAsPointerType()) 3073 return PT->getPointeeType(); 3074 3075 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer) 3076 << Ty << Op->getSourceRange(); 3077 return QualType(); 3078} 3079 3080static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 3081 tok::TokenKind Kind) { 3082 BinaryOperator::Opcode Opc; 3083 switch (Kind) { 3084 default: assert(0 && "Unknown binop!"); 3085 case tok::star: Opc = BinaryOperator::Mul; break; 3086 case tok::slash: Opc = BinaryOperator::Div; break; 3087 case tok::percent: Opc = BinaryOperator::Rem; break; 3088 case tok::plus: Opc = BinaryOperator::Add; break; 3089 case tok::minus: Opc = BinaryOperator::Sub; break; 3090 case tok::lessless: Opc = BinaryOperator::Shl; break; 3091 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 3092 case tok::lessequal: Opc = BinaryOperator::LE; break; 3093 case tok::less: Opc = BinaryOperator::LT; break; 3094 case tok::greaterequal: Opc = BinaryOperator::GE; break; 3095 case tok::greater: Opc = BinaryOperator::GT; break; 3096 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 3097 case tok::equalequal: Opc = BinaryOperator::EQ; break; 3098 case tok::amp: Opc = BinaryOperator::And; break; 3099 case tok::caret: Opc = BinaryOperator::Xor; break; 3100 case tok::pipe: Opc = BinaryOperator::Or; break; 3101 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 3102 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 3103 case tok::equal: Opc = BinaryOperator::Assign; break; 3104 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 3105 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 3106 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 3107 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 3108 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 3109 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 3110 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 3111 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 3112 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 3113 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 3114 case tok::comma: Opc = BinaryOperator::Comma; break; 3115 } 3116 return Opc; 3117} 3118 3119static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 3120 tok::TokenKind Kind) { 3121 UnaryOperator::Opcode Opc; 3122 switch (Kind) { 3123 default: assert(0 && "Unknown unary op!"); 3124 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 3125 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 3126 case tok::amp: Opc = UnaryOperator::AddrOf; break; 3127 case tok::star: Opc = UnaryOperator::Deref; break; 3128 case tok::plus: Opc = UnaryOperator::Plus; break; 3129 case tok::minus: Opc = UnaryOperator::Minus; break; 3130 case tok::tilde: Opc = UnaryOperator::Not; break; 3131 case tok::exclaim: Opc = UnaryOperator::LNot; break; 3132 case tok::kw___real: Opc = UnaryOperator::Real; break; 3133 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 3134 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 3135 } 3136 return Opc; 3137} 3138 3139/// CreateBuiltinBinOp - Creates a new built-in binary operation with 3140/// operator @p Opc at location @c TokLoc. This routine only supports 3141/// built-in operations; ActOnBinOp handles overloaded operators. 3142Action::ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 3143 unsigned Op, 3144 Expr *lhs, Expr *rhs) { 3145 QualType ResultTy; // Result type of the binary operator. 3146 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 3147 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 3148 3149 switch (Opc) { 3150 default: 3151 assert(0 && "Unknown binary expr!"); 3152 case BinaryOperator::Assign: 3153 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 3154 break; 3155 case BinaryOperator::Mul: 3156 case BinaryOperator::Div: 3157 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 3158 break; 3159 case BinaryOperator::Rem: 3160 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 3161 break; 3162 case BinaryOperator::Add: 3163 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 3164 break; 3165 case BinaryOperator::Sub: 3166 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 3167 break; 3168 case BinaryOperator::Shl: 3169 case BinaryOperator::Shr: 3170 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 3171 break; 3172 case BinaryOperator::LE: 3173 case BinaryOperator::LT: 3174 case BinaryOperator::GE: 3175 case BinaryOperator::GT: 3176 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 3177 break; 3178 case BinaryOperator::EQ: 3179 case BinaryOperator::NE: 3180 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 3181 break; 3182 case BinaryOperator::And: 3183 case BinaryOperator::Xor: 3184 case BinaryOperator::Or: 3185 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 3186 break; 3187 case BinaryOperator::LAnd: 3188 case BinaryOperator::LOr: 3189 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 3190 break; 3191 case BinaryOperator::MulAssign: 3192 case BinaryOperator::DivAssign: 3193 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 3194 if (!CompTy.isNull()) 3195 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3196 break; 3197 case BinaryOperator::RemAssign: 3198 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 3199 if (!CompTy.isNull()) 3200 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3201 break; 3202 case BinaryOperator::AddAssign: 3203 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 3204 if (!CompTy.isNull()) 3205 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3206 break; 3207 case BinaryOperator::SubAssign: 3208 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 3209 if (!CompTy.isNull()) 3210 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3211 break; 3212 case BinaryOperator::ShlAssign: 3213 case BinaryOperator::ShrAssign: 3214 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 3215 if (!CompTy.isNull()) 3216 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3217 break; 3218 case BinaryOperator::AndAssign: 3219 case BinaryOperator::XorAssign: 3220 case BinaryOperator::OrAssign: 3221 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 3222 if (!CompTy.isNull()) 3223 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 3224 break; 3225 case BinaryOperator::Comma: 3226 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 3227 break; 3228 } 3229 if (ResultTy.isNull()) 3230 return true; 3231 if (CompTy.isNull()) 3232 return new BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc); 3233 else 3234 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, OpLoc); 3235} 3236 3237// Binary Operators. 'Tok' is the token for the operator. 3238Action::ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 3239 tok::TokenKind Kind, 3240 ExprTy *LHS, ExprTy *RHS) { 3241 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 3242 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 3243 3244 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 3245 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 3246 3247 // If either expression is type-dependent, just build the AST. 3248 // FIXME: We'll need to perform some caching of the result of name 3249 // lookup for operator+. 3250 if (lhs->isTypeDependent() || rhs->isTypeDependent()) { 3251 if (Opc > BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) 3252 return new CompoundAssignOperator(lhs, rhs, Opc, Context.DependentTy, 3253 Context.DependentTy, TokLoc); 3254 else 3255 return new BinaryOperator(lhs, rhs, Opc, Context.DependentTy, TokLoc); 3256 } 3257 3258 if (getLangOptions().CPlusPlus && 3259 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 3260 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 3261 // If this is one of the assignment operators, we only perform 3262 // overload resolution if the left-hand side is a class or 3263 // enumeration type (C++ [expr.ass]p3). 3264 if (Opc >= BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign && 3265 !(lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType())) { 3266 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3267 } 3268 3269 // Determine which overloaded operator we're dealing with. 3270 static const OverloadedOperatorKind OverOps[] = { 3271 OO_Star, OO_Slash, OO_Percent, 3272 OO_Plus, OO_Minus, 3273 OO_LessLess, OO_GreaterGreater, 3274 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 3275 OO_EqualEqual, OO_ExclaimEqual, 3276 OO_Amp, 3277 OO_Caret, 3278 OO_Pipe, 3279 OO_AmpAmp, 3280 OO_PipePipe, 3281 OO_Equal, OO_StarEqual, 3282 OO_SlashEqual, OO_PercentEqual, 3283 OO_PlusEqual, OO_MinusEqual, 3284 OO_LessLessEqual, OO_GreaterGreaterEqual, 3285 OO_AmpEqual, OO_CaretEqual, 3286 OO_PipeEqual, 3287 OO_Comma 3288 }; 3289 OverloadedOperatorKind OverOp = OverOps[Opc]; 3290 3291 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3292 // to the candidate set. 3293 OverloadCandidateSet CandidateSet; 3294 Expr *Args[2] = { lhs, rhs }; 3295 AddOperatorCandidates(OverOp, S, Args, 2, CandidateSet); 3296 3297 // Perform overload resolution. 3298 OverloadCandidateSet::iterator Best; 3299 switch (BestViableFunction(CandidateSet, Best)) { 3300 case OR_Success: { 3301 // We found a built-in operator or an overloaded operator. 3302 FunctionDecl *FnDecl = Best->Function; 3303 3304 if (FnDecl) { 3305 // We matched an overloaded operator. Build a call to that 3306 // operator. 3307 3308 // Convert the arguments. 3309 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3310 if (PerformObjectArgumentInitialization(lhs, Method) || 3311 PerformCopyInitialization(rhs, FnDecl->getParamDecl(0)->getType(), 3312 "passing")) 3313 return true; 3314 } else { 3315 // Convert the arguments. 3316 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 3317 "passing") || 3318 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 3319 "passing")) 3320 return true; 3321 } 3322 3323 // Determine the result type 3324 QualType ResultTy 3325 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3326 ResultTy = ResultTy.getNonReferenceType(); 3327 3328 // Build the actual expression node. 3329 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 3330 SourceLocation()); 3331 UsualUnaryConversions(FnExpr); 3332 3333 return new CXXOperatorCallExpr(FnExpr, Args, 2, ResultTy, TokLoc); 3334 } else { 3335 // We matched a built-in operator. Convert the arguments, then 3336 // break out so that we will build the appropriate built-in 3337 // operator node. 3338 if (PerformCopyInitialization(lhs, Best->BuiltinTypes.ParamTypes[0], 3339 "passing") || 3340 PerformCopyInitialization(rhs, Best->BuiltinTypes.ParamTypes[1], 3341 "passing")) 3342 return true; 3343 3344 break; 3345 } 3346 } 3347 3348 case OR_No_Viable_Function: 3349 // No viable function; fall through to handling this as a 3350 // built-in operator, which will produce an error message for us. 3351 break; 3352 3353 case OR_Ambiguous: 3354 Diag(TokLoc, diag::err_ovl_ambiguous_oper) 3355 << BinaryOperator::getOpcodeStr(Opc) 3356 << lhs->getSourceRange() << rhs->getSourceRange(); 3357 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3358 return true; 3359 } 3360 3361 // Either we found no viable overloaded operator or we matched a 3362 // built-in operator. In either case, fall through to trying to 3363 // build a built-in operation. 3364 } 3365 3366 // Build a built-in binary operation. 3367 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 3368} 3369 3370// Unary Operators. 'Tok' is the token for the operator. 3371Action::ExprResult Sema::ActOnUnaryOp(Scope *S, SourceLocation OpLoc, 3372 tok::TokenKind Op, ExprTy *input) { 3373 Expr *Input = (Expr*)input; 3374 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 3375 3376 if (getLangOptions().CPlusPlus && 3377 (Input->getType()->isRecordType() 3378 || Input->getType()->isEnumeralType())) { 3379 // Determine which overloaded operator we're dealing with. 3380 static const OverloadedOperatorKind OverOps[] = { 3381 OO_None, OO_None, 3382 OO_PlusPlus, OO_MinusMinus, 3383 OO_Amp, OO_Star, 3384 OO_Plus, OO_Minus, 3385 OO_Tilde, OO_Exclaim, 3386 OO_None, OO_None, 3387 OO_None, 3388 OO_None 3389 }; 3390 OverloadedOperatorKind OverOp = OverOps[Opc]; 3391 3392 // Add the appropriate overloaded operators (C++ [over.match.oper]) 3393 // to the candidate set. 3394 OverloadCandidateSet CandidateSet; 3395 if (OverOp != OO_None) 3396 AddOperatorCandidates(OverOp, S, &Input, 1, CandidateSet); 3397 3398 // Perform overload resolution. 3399 OverloadCandidateSet::iterator Best; 3400 switch (BestViableFunction(CandidateSet, Best)) { 3401 case OR_Success: { 3402 // We found a built-in operator or an overloaded operator. 3403 FunctionDecl *FnDecl = Best->Function; 3404 3405 if (FnDecl) { 3406 // We matched an overloaded operator. Build a call to that 3407 // operator. 3408 3409 // Convert the arguments. 3410 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FnDecl)) { 3411 if (PerformObjectArgumentInitialization(Input, Method)) 3412 return true; 3413 } else { 3414 // Convert the arguments. 3415 if (PerformCopyInitialization(Input, 3416 FnDecl->getParamDecl(0)->getType(), 3417 "passing")) 3418 return true; 3419 } 3420 3421 // Determine the result type 3422 QualType ResultTy 3423 = FnDecl->getType()->getAsFunctionType()->getResultType(); 3424 ResultTy = ResultTy.getNonReferenceType(); 3425 3426 // Build the actual expression node. 3427 Expr *FnExpr = new DeclRefExpr(FnDecl, FnDecl->getType(), 3428 SourceLocation()); 3429 UsualUnaryConversions(FnExpr); 3430 3431 return new CXXOperatorCallExpr(FnExpr, &Input, 1, ResultTy, OpLoc); 3432 } else { 3433 // We matched a built-in operator. Convert the arguments, then 3434 // break out so that we will build the appropriate built-in 3435 // operator node. 3436 if (PerformCopyInitialization(Input, Best->BuiltinTypes.ParamTypes[0], 3437 "passing")) 3438 return true; 3439 3440 break; 3441 } 3442 } 3443 3444 case OR_No_Viable_Function: 3445 // No viable function; fall through to handling this as a 3446 // built-in operator, which will produce an error message for us. 3447 break; 3448 3449 case OR_Ambiguous: 3450 Diag(OpLoc, diag::err_ovl_ambiguous_oper) 3451 << UnaryOperator::getOpcodeStr(Opc) 3452 << Input->getSourceRange(); 3453 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 3454 return true; 3455 } 3456 3457 // Either we found no viable overloaded operator or we matched a 3458 // built-in operator. In either case, fall through to trying to 3459 // build a built-in operation. 3460 } 3461 3462 QualType resultType; 3463 switch (Opc) { 3464 default: 3465 assert(0 && "Unimplemented unary expr!"); 3466 case UnaryOperator::PreInc: 3467 case UnaryOperator::PreDec: 3468 resultType = CheckIncrementDecrementOperand(Input, OpLoc, 3469 Opc == UnaryOperator::PreInc); 3470 break; 3471 case UnaryOperator::AddrOf: 3472 resultType = CheckAddressOfOperand(Input, OpLoc); 3473 break; 3474 case UnaryOperator::Deref: 3475 DefaultFunctionArrayConversion(Input); 3476 resultType = CheckIndirectionOperand(Input, OpLoc); 3477 break; 3478 case UnaryOperator::Plus: 3479 case UnaryOperator::Minus: 3480 UsualUnaryConversions(Input); 3481 resultType = Input->getType(); 3482 if (resultType->isArithmeticType()) // C99 6.5.3.3p1 3483 break; 3484 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6-7 3485 resultType->isEnumeralType()) 3486 break; 3487 else if (getLangOptions().CPlusPlus && // C++ [expr.unary.op]p6 3488 Opc == UnaryOperator::Plus && 3489 resultType->isPointerType()) 3490 break; 3491 3492 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3493 << resultType << Input->getSourceRange(); 3494 case UnaryOperator::Not: // bitwise complement 3495 UsualUnaryConversions(Input); 3496 resultType = Input->getType(); 3497 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 3498 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 3499 // C99 does not support '~' for complex conjugation. 3500 Diag(OpLoc, diag::ext_integer_complement_complex) 3501 << resultType << Input->getSourceRange(); 3502 else if (!resultType->isIntegerType()) 3503 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3504 << resultType << Input->getSourceRange(); 3505 break; 3506 case UnaryOperator::LNot: // logical negation 3507 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 3508 DefaultFunctionArrayConversion(Input); 3509 resultType = Input->getType(); 3510 if (!resultType->isScalarType()) // C99 6.5.3.3p1 3511 return Diag(OpLoc, diag::err_typecheck_unary_expr) 3512 << resultType << Input->getSourceRange(); 3513 // LNot always has type int. C99 6.5.3.3p5. 3514 resultType = Context.IntTy; 3515 break; 3516 case UnaryOperator::Real: 3517 case UnaryOperator::Imag: 3518 resultType = CheckRealImagOperand(Input, OpLoc); 3519 break; 3520 case UnaryOperator::Extension: 3521 resultType = Input->getType(); 3522 break; 3523 } 3524 if (resultType.isNull()) 3525 return true; 3526 return new UnaryOperator(Input, Opc, resultType, OpLoc); 3527} 3528 3529/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 3530Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 3531 SourceLocation LabLoc, 3532 IdentifierInfo *LabelII) { 3533 // Look up the record for this label identifier. 3534 LabelStmt *&LabelDecl = LabelMap[LabelII]; 3535 3536 // If we haven't seen this label yet, create a forward reference. It 3537 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 3538 if (LabelDecl == 0) 3539 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 3540 3541 // Create the AST node. The address of a label always has type 'void*'. 3542 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 3543 Context.getPointerType(Context.VoidTy)); 3544} 3545 3546Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 3547 SourceLocation RPLoc) { // "({..})" 3548 Stmt *SubStmt = static_cast<Stmt*>(substmt); 3549 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 3550 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 3551 3552 // FIXME: there are a variety of strange constraints to enforce here, for 3553 // example, it is not possible to goto into a stmt expression apparently. 3554 // More semantic analysis is needed. 3555 3556 // FIXME: the last statement in the compount stmt has its value used. We 3557 // should not warn about it being unused. 3558 3559 // If there are sub stmts in the compound stmt, take the type of the last one 3560 // as the type of the stmtexpr. 3561 QualType Ty = Context.VoidTy; 3562 3563 if (!Compound->body_empty()) { 3564 Stmt *LastStmt = Compound->body_back(); 3565 // If LastStmt is a label, skip down through into the body. 3566 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 3567 LastStmt = Label->getSubStmt(); 3568 3569 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 3570 Ty = LastExpr->getType(); 3571 } 3572 3573 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 3574} 3575 3576Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 3577 SourceLocation TypeLoc, 3578 TypeTy *argty, 3579 OffsetOfComponent *CompPtr, 3580 unsigned NumComponents, 3581 SourceLocation RPLoc) { 3582 QualType ArgTy = QualType::getFromOpaquePtr(argty); 3583 assert(!ArgTy.isNull() && "Missing type argument!"); 3584 3585 // We must have at least one component that refers to the type, and the first 3586 // one is known to be a field designator. Verify that the ArgTy represents 3587 // a struct/union/class. 3588 if (!ArgTy->isRecordType()) 3589 return Diag(TypeLoc, diag::err_offsetof_record_type) << ArgTy; 3590 3591 // Otherwise, create a compound literal expression as the base, and 3592 // iteratively process the offsetof designators. 3593 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 3594 3595 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 3596 // GCC extension, diagnose them. 3597 if (NumComponents != 1) 3598 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator) 3599 << SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd); 3600 3601 for (unsigned i = 0; i != NumComponents; ++i) { 3602 const OffsetOfComponent &OC = CompPtr[i]; 3603 if (OC.isBrackets) { 3604 // Offset of an array sub-field. TODO: Should we allow vector elements? 3605 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 3606 if (!AT) { 3607 delete Res; 3608 return Diag(OC.LocEnd, diag::err_offsetof_array_type) << Res->getType(); 3609 } 3610 3611 // FIXME: C++: Verify that operator[] isn't overloaded. 3612 3613 // C99 6.5.2.1p1 3614 Expr *Idx = static_cast<Expr*>(OC.U.E); 3615 if (!Idx->getType()->isIntegerType()) 3616 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript) 3617 << Idx->getSourceRange(); 3618 3619 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 3620 continue; 3621 } 3622 3623 const RecordType *RC = Res->getType()->getAsRecordType(); 3624 if (!RC) { 3625 delete Res; 3626 return Diag(OC.LocEnd, diag::err_offsetof_record_type) << Res->getType(); 3627 } 3628 3629 // Get the decl corresponding to this. 3630 RecordDecl *RD = RC->getDecl(); 3631 FieldDecl *MemberDecl = 0; 3632 DeclContext::lookup_result Lookup = RD->lookup(Context, OC.U.IdentInfo); 3633 if (Lookup.first != Lookup.second) 3634 MemberDecl = dyn_cast<FieldDecl>(*Lookup.first); 3635 3636 if (!MemberDecl) 3637 return Diag(BuiltinLoc, diag::err_typecheck_no_member) 3638 << OC.U.IdentInfo << SourceRange(OC.LocStart, OC.LocEnd); 3639 3640 // FIXME: C++: Verify that MemberDecl isn't a static field. 3641 // FIXME: Verify that MemberDecl isn't a bitfield. 3642 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 3643 // matter here. 3644 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, 3645 MemberDecl->getType().getNonReferenceType()); 3646 } 3647 3648 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 3649 BuiltinLoc); 3650} 3651 3652 3653Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 3654 TypeTy *arg1, TypeTy *arg2, 3655 SourceLocation RPLoc) { 3656 QualType argT1 = QualType::getFromOpaquePtr(arg1); 3657 QualType argT2 = QualType::getFromOpaquePtr(arg2); 3658 3659 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 3660 3661 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 3662} 3663 3664Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 3665 ExprTy *expr1, ExprTy *expr2, 3666 SourceLocation RPLoc) { 3667 Expr *CondExpr = static_cast<Expr*>(cond); 3668 Expr *LHSExpr = static_cast<Expr*>(expr1); 3669 Expr *RHSExpr = static_cast<Expr*>(expr2); 3670 3671 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 3672 3673 // The conditional expression is required to be a constant expression. 3674 llvm::APSInt condEval(32); 3675 SourceLocation ExpLoc; 3676 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 3677 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant) 3678 << CondExpr->getSourceRange(); 3679 3680 // If the condition is > zero, then the AST type is the same as the LSHExpr. 3681 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 3682 RHSExpr->getType(); 3683 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 3684} 3685 3686//===----------------------------------------------------------------------===// 3687// Clang Extensions. 3688//===----------------------------------------------------------------------===// 3689 3690/// ActOnBlockStart - This callback is invoked when a block literal is started. 3691void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 3692 // Analyze block parameters. 3693 BlockSemaInfo *BSI = new BlockSemaInfo(); 3694 3695 // Add BSI to CurBlock. 3696 BSI->PrevBlockInfo = CurBlock; 3697 CurBlock = BSI; 3698 3699 BSI->ReturnType = 0; 3700 BSI->TheScope = BlockScope; 3701 3702 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 3703 PushDeclContext(BlockScope, BSI->TheDecl); 3704} 3705 3706void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 3707 // Analyze arguments to block. 3708 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 3709 "Not a function declarator!"); 3710 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 3711 3712 CurBlock->hasPrototype = FTI.hasPrototype; 3713 CurBlock->isVariadic = true; 3714 3715 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 3716 // no arguments, not a function that takes a single void argument. 3717 if (FTI.hasPrototype && 3718 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3719 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 3720 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 3721 // empty arg list, don't push any params. 3722 CurBlock->isVariadic = false; 3723 } else if (FTI.hasPrototype) { 3724 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 3725 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 3726 CurBlock->isVariadic = FTI.isVariadic; 3727 } 3728 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 3729 3730 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 3731 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 3732 // If this has an identifier, add it to the scope stack. 3733 if ((*AI)->getIdentifier()) 3734 PushOnScopeChains(*AI, CurBlock->TheScope); 3735} 3736 3737/// ActOnBlockError - If there is an error parsing a block, this callback 3738/// is invoked to pop the information about the block from the action impl. 3739void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 3740 // Ensure that CurBlock is deleted. 3741 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 3742 3743 // Pop off CurBlock, handle nested blocks. 3744 CurBlock = CurBlock->PrevBlockInfo; 3745 3746 // FIXME: Delete the ParmVarDecl objects as well??? 3747 3748} 3749 3750/// ActOnBlockStmtExpr - This is called when the body of a block statement 3751/// literal was successfully completed. ^(int x){...} 3752Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 3753 Scope *CurScope) { 3754 // Ensure that CurBlock is deleted. 3755 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 3756 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 3757 3758 PopDeclContext(); 3759 3760 // Pop off CurBlock, handle nested blocks. 3761 CurBlock = CurBlock->PrevBlockInfo; 3762 3763 QualType RetTy = Context.VoidTy; 3764 if (BSI->ReturnType) 3765 RetTy = QualType(BSI->ReturnType, 0); 3766 3767 llvm::SmallVector<QualType, 8> ArgTypes; 3768 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 3769 ArgTypes.push_back(BSI->Params[i]->getType()); 3770 3771 QualType BlockTy; 3772 if (!BSI->hasPrototype) 3773 BlockTy = Context.getFunctionTypeNoProto(RetTy); 3774 else 3775 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 3776 BSI->isVariadic, 0); 3777 3778 BlockTy = Context.getBlockPointerType(BlockTy); 3779 3780 BSI->TheDecl->setBody(Body.take()); 3781 return new BlockExpr(BSI->TheDecl, BlockTy); 3782} 3783 3784/// ExprsMatchFnType - return true if the Exprs in array Args have 3785/// QualTypes that match the QualTypes of the arguments of the FnType. 3786/// The number of arguments has already been validated to match the number of 3787/// arguments in FnType. 3788static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 3789 ASTContext &Context) { 3790 unsigned NumParams = FnType->getNumArgs(); 3791 for (unsigned i = 0; i != NumParams; ++i) { 3792 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 3793 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 3794 3795 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 3796 return false; 3797 } 3798 return true; 3799} 3800 3801Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 3802 SourceLocation *CommaLocs, 3803 SourceLocation BuiltinLoc, 3804 SourceLocation RParenLoc) { 3805 // __builtin_overload requires at least 2 arguments 3806 if (NumArgs < 2) 3807 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 3808 << SourceRange(BuiltinLoc, RParenLoc); 3809 3810 // The first argument is required to be a constant expression. It tells us 3811 // the number of arguments to pass to each of the functions to be overloaded. 3812 Expr **Args = reinterpret_cast<Expr**>(args); 3813 Expr *NParamsExpr = Args[0]; 3814 llvm::APSInt constEval(32); 3815 SourceLocation ExpLoc; 3816 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 3817 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 3818 << NParamsExpr->getSourceRange(); 3819 3820 // Verify that the number of parameters is > 0 3821 unsigned NumParams = constEval.getZExtValue(); 3822 if (NumParams == 0) 3823 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant) 3824 << NParamsExpr->getSourceRange(); 3825 // Verify that we have at least 1 + NumParams arguments to the builtin. 3826 if ((NumParams + 1) > NumArgs) 3827 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args) 3828 << SourceRange(BuiltinLoc, RParenLoc); 3829 3830 // Figure out the return type, by matching the args to one of the functions 3831 // listed after the parameters. 3832 OverloadExpr *OE = 0; 3833 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 3834 // UsualUnaryConversions will convert the function DeclRefExpr into a 3835 // pointer to function. 3836 Expr *Fn = UsualUnaryConversions(Args[i]); 3837 const FunctionTypeProto *FnType = 0; 3838 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3839 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3840 3841 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3842 // parameters, and the number of parameters must match the value passed to 3843 // the builtin. 3844 if (!FnType || (FnType->getNumArgs() != NumParams)) 3845 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype) 3846 << Fn->getSourceRange(); 3847 3848 // Scan the parameter list for the FunctionType, checking the QualType of 3849 // each parameter against the QualTypes of the arguments to the builtin. 3850 // If they match, return a new OverloadExpr. 3851 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3852 if (OE) 3853 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match) 3854 << OE->getFn()->getSourceRange(); 3855 // Remember our match, and continue processing the remaining arguments 3856 // to catch any errors. 3857 OE = new OverloadExpr(Args, NumArgs, i, 3858 FnType->getResultType().getNonReferenceType(), 3859 BuiltinLoc, RParenLoc); 3860 } 3861 } 3862 // Return the newly created OverloadExpr node, if we succeded in matching 3863 // exactly one of the candidate functions. 3864 if (OE) 3865 return OE; 3866 3867 // If we didn't find a matching function Expr in the __builtin_overload list 3868 // the return an error. 3869 std::string typeNames; 3870 for (unsigned i = 0; i != NumParams; ++i) { 3871 if (i != 0) typeNames += ", "; 3872 typeNames += Args[i+1]->getType().getAsString(); 3873 } 3874 3875 return Diag(BuiltinLoc, diag::err_overload_no_match) 3876 << typeNames << SourceRange(BuiltinLoc, RParenLoc); 3877} 3878 3879Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3880 ExprTy *expr, TypeTy *type, 3881 SourceLocation RPLoc) { 3882 Expr *E = static_cast<Expr*>(expr); 3883 QualType T = QualType::getFromOpaquePtr(type); 3884 3885 InitBuiltinVaListType(); 3886 3887 // Get the va_list type 3888 QualType VaListType = Context.getBuiltinVaListType(); 3889 // Deal with implicit array decay; for example, on x86-64, 3890 // va_list is an array, but it's supposed to decay to 3891 // a pointer for va_arg. 3892 if (VaListType->isArrayType()) 3893 VaListType = Context.getArrayDecayedType(VaListType); 3894 // Make sure the input expression also decays appropriately. 3895 UsualUnaryConversions(E); 3896 3897 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3898 return Diag(E->getLocStart(), 3899 diag::err_first_argument_to_va_arg_not_of_type_va_list) 3900 << E->getType() << E->getSourceRange(); 3901 3902 // FIXME: Warn if a non-POD type is passed in. 3903 3904 return new VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 3905} 3906 3907Sema::ExprResult Sema::ActOnGNUNullExpr(SourceLocation TokenLoc) { 3908 // The type of __null will be int or long, depending on the size of 3909 // pointers on the target. 3910 QualType Ty; 3911 if (Context.Target.getPointerWidth(0) == Context.Target.getIntWidth()) 3912 Ty = Context.IntTy; 3913 else 3914 Ty = Context.LongTy; 3915 3916 return new GNUNullExpr(Ty, TokenLoc); 3917} 3918 3919bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3920 SourceLocation Loc, 3921 QualType DstType, QualType SrcType, 3922 Expr *SrcExpr, const char *Flavor) { 3923 // Decode the result (notice that AST's are still created for extensions). 3924 bool isInvalid = false; 3925 unsigned DiagKind; 3926 switch (ConvTy) { 3927 default: assert(0 && "Unknown conversion type"); 3928 case Compatible: return false; 3929 case PointerToInt: 3930 DiagKind = diag::ext_typecheck_convert_pointer_int; 3931 break; 3932 case IntToPointer: 3933 DiagKind = diag::ext_typecheck_convert_int_pointer; 3934 break; 3935 case IncompatiblePointer: 3936 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3937 break; 3938 case FunctionVoidPointer: 3939 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3940 break; 3941 case CompatiblePointerDiscardsQualifiers: 3942 // If the qualifiers lost were because we were applying the 3943 // (deprecated) C++ conversion from a string literal to a char* 3944 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3945 // Ideally, this check would be performed in 3946 // CheckPointerTypesForAssignment. However, that would require a 3947 // bit of refactoring (so that the second argument is an 3948 // expression, rather than a type), which should be done as part 3949 // of a larger effort to fix CheckPointerTypesForAssignment for 3950 // C++ semantics. 3951 if (getLangOptions().CPlusPlus && 3952 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3953 return false; 3954 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3955 break; 3956 case IntToBlockPointer: 3957 DiagKind = diag::err_int_to_block_pointer; 3958 break; 3959 case IncompatibleBlockPointer: 3960 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3961 break; 3962 case IncompatibleObjCQualifiedId: 3963 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3964 // it can give a more specific diagnostic. 3965 DiagKind = diag::warn_incompatible_qualified_id; 3966 break; 3967 case Incompatible: 3968 DiagKind = diag::err_typecheck_convert_incompatible; 3969 isInvalid = true; 3970 break; 3971 } 3972 3973 Diag(Loc, DiagKind) << DstType << SrcType << Flavor 3974 << SrcExpr->getSourceRange(); 3975 return isInvalid; 3976} 3977 3978bool Sema::VerifyIntegerConstantExpression(const Expr* E, llvm::APSInt *Result) 3979{ 3980 Expr::EvalResult EvalResult; 3981 3982 if (!E->Evaluate(EvalResult, Context) || !EvalResult.Val.isInt() || 3983 EvalResult.HasSideEffects) { 3984 Diag(E->getExprLoc(), diag::err_expr_not_ice) << E->getSourceRange(); 3985 3986 if (EvalResult.Diag) { 3987 // We only show the note if it's not the usual "invalid subexpression" 3988 // or if it's actually in a subexpression. 3989 if (EvalResult.Diag != diag::note_invalid_subexpr_in_ice || 3990 E->IgnoreParens() != EvalResult.DiagExpr->IgnoreParens()) 3991 Diag(EvalResult.DiagLoc, EvalResult.Diag); 3992 } 3993 3994 return true; 3995 } 3996 3997 if (EvalResult.Diag) { 3998 Diag(E->getExprLoc(), diag::ext_expr_not_ice) << 3999 E->getSourceRange(); 4000 4001 // Print the reason it's not a constant. 4002 if (Diags.getDiagnosticLevel(diag::ext_expr_not_ice) != Diagnostic::Ignored) 4003 Diag(EvalResult.DiagLoc, EvalResult.Diag); 4004 } 4005 4006 if (Result) 4007 *Result = EvalResult.Val.getInt(); 4008 return false; 4009} 4010