SemaExpr.cpp revision eb83ecde1a822b1c38cd060a85a08c1ac9f82cf8
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 // For conversion purposes, we ignore any qualifiers. 103 // For example, "const float" and "float" are equivalent. 104 QualType lhs = 105 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 106 QualType rhs = 107 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 108 109 // If both types are identical, no conversion is needed. 110 if (lhs == rhs) 111 return lhs; 112 113 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 114 // The caller can deal with this (e.g. pointer + int). 115 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 116 return lhs; 117 118 // At this point, we have two different arithmetic types. 119 120 // Handle complex types first (C99 6.3.1.8p1). 121 if (lhs->isComplexType() || rhs->isComplexType()) { 122 // if we have an integer operand, the result is the complex type. 123 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 124 // convert the rhs to the lhs complex type. 125 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 126 return lhs; 127 } 128 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 129 // convert the lhs to the rhs complex type. 130 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 131 return rhs; 132 } 133 // This handles complex/complex, complex/float, or float/complex. 134 // When both operands are complex, the shorter operand is converted to the 135 // type of the longer, and that is the type of the result. This corresponds 136 // to what is done when combining two real floating-point operands. 137 // The fun begins when size promotion occur across type domains. 138 // From H&S 6.3.4: When one operand is complex and the other is a real 139 // floating-point type, the less precise type is converted, within it's 140 // real or complex domain, to the precision of the other type. For example, 141 // when combining a "long double" with a "double _Complex", the 142 // "double _Complex" is promoted to "long double _Complex". 143 int result = Context.getFloatingTypeOrder(lhs, rhs); 144 145 if (result > 0) { // The left side is bigger, convert rhs. 146 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 147 if (!isCompAssign) 148 ImpCastExprToType(rhsExpr, rhs); 149 } else if (result < 0) { // The right side is bigger, convert lhs. 150 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 151 if (!isCompAssign) 152 ImpCastExprToType(lhsExpr, lhs); 153 } 154 // At this point, lhs and rhs have the same rank/size. Now, make sure the 155 // domains match. This is a requirement for our implementation, C99 156 // does not require this promotion. 157 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 158 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 159 if (!isCompAssign) 160 ImpCastExprToType(lhsExpr, rhs); 161 return rhs; 162 } else { // handle "_Complex double, double". 163 if (!isCompAssign) 164 ImpCastExprToType(rhsExpr, lhs); 165 return lhs; 166 } 167 } 168 return lhs; // The domain/size match exactly. 169 } 170 // Now handle "real" floating types (i.e. float, double, long double). 171 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 172 // if we have an integer operand, the result is the real floating type. 173 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 174 // convert rhs to the lhs floating point type. 175 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 176 return lhs; 177 } 178 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 179 // convert lhs to the rhs floating point type. 180 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 181 return rhs; 182 } 183 // We have two real floating types, float/complex combos were handled above. 184 // Convert the smaller operand to the bigger result. 185 int result = Context.getFloatingTypeOrder(lhs, rhs); 186 187 if (result > 0) { // convert the rhs 188 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 189 return lhs; 190 } 191 if (result < 0) { // convert the lhs 192 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 193 return rhs; 194 } 195 assert(0 && "Sema::UsualArithmeticConversions(): illegal float comparison"); 196 } 197 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 198 // Handle GCC complex int extension. 199 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 200 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 201 202 if (lhsComplexInt && rhsComplexInt) { 203 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 204 rhsComplexInt->getElementType()) >= 0) { 205 // convert the rhs 206 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 207 return lhs; 208 } 209 if (!isCompAssign) 210 ImpCastExprToType(lhsExpr, rhs); // convert the lhs 211 return rhs; 212 } else if (lhsComplexInt && rhs->isIntegerType()) { 213 // convert the rhs to the lhs complex type. 214 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 215 return lhs; 216 } else if (rhsComplexInt && lhs->isIntegerType()) { 217 // convert the lhs to the rhs complex type. 218 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 219 return rhs; 220 } 221 } 222 // Finally, we have two differing integer types. 223 // The rules for this case are in C99 6.3.1.8 224 int compare = Context.getIntegerTypeOrder(lhs, rhs); 225 bool lhsSigned = lhs->isSignedIntegerType(), 226 rhsSigned = rhs->isSignedIntegerType(); 227 QualType destType; 228 if (lhsSigned == rhsSigned) { 229 // Same signedness; use the higher-ranked type 230 destType = compare >= 0 ? lhs : rhs; 231 } else if (compare != (lhsSigned ? 1 : -1)) { 232 // The unsigned type has greater than or equal rank to the 233 // signed type, so use the unsigned type 234 destType = lhsSigned ? rhs : lhs; 235 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 236 // The two types are different widths; if we are here, that 237 // means the signed type is larger than the unsigned type, so 238 // use the signed type. 239 destType = lhsSigned ? lhs : rhs; 240 } else { 241 // The signed type is higher-ranked than the unsigned type, 242 // but isn't actually any bigger (like unsigned int and long 243 // on most 32-bit systems). Use the unsigned type corresponding 244 // to the signed type. 245 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 246 } 247 if (!isCompAssign) { 248 ImpCastExprToType(lhsExpr, destType); 249 ImpCastExprToType(rhsExpr, destType); 250 } 251 return destType; 252} 253 254//===----------------------------------------------------------------------===// 255// Semantic Analysis for various Expression Types 256//===----------------------------------------------------------------------===// 257 258 259/// ActOnStringLiteral - The specified tokens were lexed as pasted string 260/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 261/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 262/// multiple tokens. However, the common case is that StringToks points to one 263/// string. 264/// 265Action::ExprResult 266Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 267 assert(NumStringToks && "Must have at least one string!"); 268 269 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 270 if (Literal.hadError) 271 return ExprResult(true); 272 273 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 274 for (unsigned i = 0; i != NumStringToks; ++i) 275 StringTokLocs.push_back(StringToks[i].getLocation()); 276 277 // Verify that pascal strings aren't too large. 278 if (Literal.Pascal && Literal.GetStringLength() > 256) 279 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long, 280 SourceRange(StringToks[0].getLocation(), 281 StringToks[NumStringToks-1].getLocation())); 282 283 QualType StrTy = Context.CharTy; 284 if (Literal.AnyWide) StrTy = Context.getWCharType(); 285 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 286 287 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 288 if (getLangOptions().CPlusPlus) 289 StrTy.addConst(); 290 291 // Get an array type for the string, according to C99 6.4.5. This includes 292 // the nul terminator character as well as the string length for pascal 293 // strings. 294 StrTy = Context.getConstantArrayType(StrTy, 295 llvm::APInt(32, Literal.GetStringLength()+1), 296 ArrayType::Normal, 0); 297 298 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 299 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 300 Literal.AnyWide, StrTy, 301 StringToks[0].getLocation(), 302 StringToks[NumStringToks-1].getLocation()); 303} 304 305/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 306/// CurBlock to VD should cause it to be snapshotted (as we do for auto 307/// variables defined outside the block) or false if this is not needed (e.g. 308/// for values inside the block or for globals). 309/// 310/// FIXME: This will create BlockDeclRefExprs for global variables, 311/// function references, etc which is suboptimal :) and breaks 312/// things like "integer constant expression" tests. 313static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 314 ValueDecl *VD) { 315 // If the value is defined inside the block, we couldn't snapshot it even if 316 // we wanted to. 317 if (CurBlock->TheDecl == VD->getDeclContext()) 318 return false; 319 320 // If this is an enum constant or function, it is constant, don't snapshot. 321 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 322 return false; 323 324 // If this is a reference to an extern, static, or global variable, no need to 325 // snapshot it. 326 // FIXME: What about 'const' variables in C++? 327 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 328 return Var->hasLocalStorage(); 329 330 return true; 331} 332 333 334 335/// ActOnIdentifierExpr - The parser read an identifier in expression context, 336/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 337/// identifier is used in a function call context. 338Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 339 IdentifierInfo &II, 340 bool HasTrailingLParen, 341 const CXXScopeSpec *SS) { 342 // Could be enum-constant, value decl, instance variable, etc. 343 Decl *D = LookupDecl(&II, Decl::IDNS_Ordinary, S); 344 345 // If this reference is in an Objective-C method, then ivar lookup happens as 346 // well. 347 if (getCurMethodDecl()) { 348 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 349 // There are two cases to handle here. 1) scoped lookup could have failed, 350 // in which case we should look for an ivar. 2) scoped lookup could have 351 // found a decl, but that decl is outside the current method (i.e. a global 352 // variable). In these two cases, we do a lookup for an ivar with this 353 // name, if the lookup suceeds, we replace it our current decl. 354 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 355 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 356 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&II)) { 357 // FIXME: This should use a new expr for a direct reference, don't turn 358 // this into Self->ivar, just return a BareIVarExpr or something. 359 IdentifierInfo &II = Context.Idents.get("self"); 360 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 361 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 362 static_cast<Expr*>(SelfExpr.Val), true, true); 363 } 364 } 365 // Needed to implement property "super.method" notation. 366 if (SD == 0 && &II == SuperID) { 367 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 368 getCurMethodDecl()->getClassInterface())); 369 return new ObjCSuperExpr(Loc, T); 370 } 371 } 372 if (D == 0) { 373 // Otherwise, this could be an implicitly declared function reference (legal 374 // in C90, extension in C99). 375 if (HasTrailingLParen && 376 !getLangOptions().CPlusPlus) // Not in C++. 377 D = ImplicitlyDefineFunction(Loc, II, S); 378 else { 379 // If this name wasn't predeclared and if this is not a function call, 380 // diagnose the problem. 381 return Diag(Loc, diag::err_undeclared_var_use, II.getName()); 382 } 383 } 384 385 if (CXXFieldDecl *FD = dyn_cast<CXXFieldDecl>(D)) { 386 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 387 if (MD->isStatic()) 388 // "invalid use of member 'x' in static member function" 389 return Diag(Loc, diag::err_invalid_member_use_in_static_method, 390 FD->getName()); 391 if (cast<CXXRecordDecl>(MD->getParent()) != FD->getParent()) 392 // "invalid use of nonstatic data member 'x'" 393 return Diag(Loc, diag::err_invalid_non_static_member_use, 394 FD->getName()); 395 396 if (FD->isInvalidDecl()) 397 return true; 398 399 // FIXME: Handle 'mutable'. 400 return new DeclRefExpr(FD, 401 FD->getType().getWithAdditionalQualifiers(MD->getTypeQualifiers()),Loc); 402 } 403 404 return Diag(Loc, diag::err_invalid_non_static_member_use, FD->getName()); 405 } 406 if (isa<TypedefDecl>(D)) 407 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 408 if (isa<ObjCInterfaceDecl>(D)) 409 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 410 if (isa<NamespaceDecl>(D)) 411 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 412 413 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 414 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 415 return new DeclRefExpr(Ovl, Context.OverloadTy, Loc); 416 417 ValueDecl *VD = cast<ValueDecl>(D); 418 419 // check if referencing an identifier with __attribute__((deprecated)). 420 if (VD->getAttr<DeprecatedAttr>()) 421 Diag(Loc, diag::warn_deprecated, VD->getName()); 422 423 // Only create DeclRefExpr's for valid Decl's. 424 if (VD->isInvalidDecl()) 425 return true; 426 427 // If the identifier reference is inside a block, and it refers to a value 428 // that is outside the block, create a BlockDeclRefExpr instead of a 429 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 430 // the block is formed. 431 // 432 // We do not do this for things like enum constants, global variables, etc, 433 // as they do not get snapshotted. 434 // 435 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 436 // The BlocksAttr indicates the variable is bound by-reference. 437 if (VD->getAttr<BlocksAttr>()) 438 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 439 Loc, true); 440 441 // Variable will be bound by-copy, make it const within the closure. 442 VD->getType().addConst(); 443 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 444 Loc, false); 445 } 446 // If this reference is not in a block or if the referenced variable is 447 // within the block, create a normal DeclRefExpr. 448 return new DeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc); 449} 450 451Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 452 tok::TokenKind Kind) { 453 PredefinedExpr::IdentType IT; 454 455 switch (Kind) { 456 default: assert(0 && "Unknown simple primary expr!"); 457 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 458 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 459 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 460 } 461 462 // Verify that this is in a function context. 463 if (getCurFunctionDecl() == 0 && getCurMethodDecl() == 0) 464 return Diag(Loc, diag::err_predef_outside_function); 465 466 // Pre-defined identifiers are of type char[x], where x is the length of the 467 // string. 468 unsigned Length; 469 if (getCurFunctionDecl()) 470 Length = getCurFunctionDecl()->getIdentifier()->getLength(); 471 else 472 Length = getCurMethodDecl()->getSynthesizedMethodSize(); 473 474 llvm::APInt LengthI(32, Length + 1); 475 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 476 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 477 return new PredefinedExpr(Loc, ResTy, IT); 478} 479 480Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 481 llvm::SmallString<16> CharBuffer; 482 CharBuffer.resize(Tok.getLength()); 483 const char *ThisTokBegin = &CharBuffer[0]; 484 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 485 486 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 487 Tok.getLocation(), PP); 488 if (Literal.hadError()) 489 return ExprResult(true); 490 491 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 492 493 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 494 Tok.getLocation()); 495} 496 497Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 498 // fast path for a single digit (which is quite common). A single digit 499 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 500 if (Tok.getLength() == 1) { 501 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 502 503 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 504 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 505 Context.IntTy, 506 Tok.getLocation())); 507 } 508 llvm::SmallString<512> IntegerBuffer; 509 // Add padding so that NumericLiteralParser can overread by one character. 510 IntegerBuffer.resize(Tok.getLength()+1); 511 const char *ThisTokBegin = &IntegerBuffer[0]; 512 513 // Get the spelling of the token, which eliminates trigraphs, etc. 514 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 515 516 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 517 Tok.getLocation(), PP); 518 if (Literal.hadError) 519 return ExprResult(true); 520 521 Expr *Res; 522 523 if (Literal.isFloatingLiteral()) { 524 QualType Ty; 525 if (Literal.isFloat) 526 Ty = Context.FloatTy; 527 else if (!Literal.isLong) 528 Ty = Context.DoubleTy; 529 else 530 Ty = Context.LongDoubleTy; 531 532 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 533 534 // isExact will be set by GetFloatValue(). 535 bool isExact = false; 536 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 537 Ty, Tok.getLocation()); 538 539 } else if (!Literal.isIntegerLiteral()) { 540 return ExprResult(true); 541 } else { 542 QualType Ty; 543 544 // long long is a C99 feature. 545 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 546 Literal.isLongLong) 547 Diag(Tok.getLocation(), diag::ext_longlong); 548 549 // Get the value in the widest-possible width. 550 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 551 552 if (Literal.GetIntegerValue(ResultVal)) { 553 // If this value didn't fit into uintmax_t, warn and force to ull. 554 Diag(Tok.getLocation(), diag::warn_integer_too_large); 555 Ty = Context.UnsignedLongLongTy; 556 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 557 "long long is not intmax_t?"); 558 } else { 559 // If this value fits into a ULL, try to figure out what else it fits into 560 // according to the rules of C99 6.4.4.1p5. 561 562 // Octal, Hexadecimal, and integers with a U suffix are allowed to 563 // be an unsigned int. 564 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 565 566 // Check from smallest to largest, picking the smallest type we can. 567 unsigned Width = 0; 568 if (!Literal.isLong && !Literal.isLongLong) { 569 // Are int/unsigned possibilities? 570 unsigned IntSize = Context.Target.getIntWidth(); 571 572 // Does it fit in a unsigned int? 573 if (ResultVal.isIntN(IntSize)) { 574 // Does it fit in a signed int? 575 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 576 Ty = Context.IntTy; 577 else if (AllowUnsigned) 578 Ty = Context.UnsignedIntTy; 579 Width = IntSize; 580 } 581 } 582 583 // Are long/unsigned long possibilities? 584 if (Ty.isNull() && !Literal.isLongLong) { 585 unsigned LongSize = Context.Target.getLongWidth(); 586 587 // Does it fit in a unsigned long? 588 if (ResultVal.isIntN(LongSize)) { 589 // Does it fit in a signed long? 590 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 591 Ty = Context.LongTy; 592 else if (AllowUnsigned) 593 Ty = Context.UnsignedLongTy; 594 Width = LongSize; 595 } 596 } 597 598 // Finally, check long long if needed. 599 if (Ty.isNull()) { 600 unsigned LongLongSize = Context.Target.getLongLongWidth(); 601 602 // Does it fit in a unsigned long long? 603 if (ResultVal.isIntN(LongLongSize)) { 604 // Does it fit in a signed long long? 605 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 606 Ty = Context.LongLongTy; 607 else if (AllowUnsigned) 608 Ty = Context.UnsignedLongLongTy; 609 Width = LongLongSize; 610 } 611 } 612 613 // If we still couldn't decide a type, we probably have something that 614 // does not fit in a signed long long, but has no U suffix. 615 if (Ty.isNull()) { 616 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 617 Ty = Context.UnsignedLongLongTy; 618 Width = Context.Target.getLongLongWidth(); 619 } 620 621 if (ResultVal.getBitWidth() != Width) 622 ResultVal.trunc(Width); 623 } 624 625 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 626 } 627 628 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 629 if (Literal.isImaginary) 630 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 631 632 return Res; 633} 634 635Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 636 ExprTy *Val) { 637 Expr *E = (Expr *)Val; 638 assert((E != 0) && "ActOnParenExpr() missing expr"); 639 return new ParenExpr(L, R, E); 640} 641 642/// The UsualUnaryConversions() function is *not* called by this routine. 643/// See C99 6.3.2.1p[2-4] for more details. 644QualType Sema::CheckSizeOfAlignOfOperand(QualType exprType, 645 SourceLocation OpLoc, 646 const SourceRange &ExprRange, 647 bool isSizeof) { 648 // C99 6.5.3.4p1: 649 if (isa<FunctionType>(exprType) && isSizeof) 650 // alignof(function) is allowed. 651 Diag(OpLoc, diag::ext_sizeof_function_type, ExprRange); 652 else if (exprType->isVoidType()) 653 Diag(OpLoc, diag::ext_sizeof_void_type, isSizeof ? "sizeof" : "__alignof", 654 ExprRange); 655 else if (exprType->isIncompleteType()) { 656 Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 657 diag::err_alignof_incomplete_type, 658 exprType.getAsString(), ExprRange); 659 return QualType(); // error 660 } 661 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 662 return Context.getSizeType(); 663} 664 665Action::ExprResult Sema:: 666ActOnSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, 667 SourceLocation LPLoc, TypeTy *Ty, 668 SourceLocation RPLoc) { 669 // If error parsing type, ignore. 670 if (Ty == 0) return true; 671 672 // Verify that this is a valid expression. 673 QualType ArgTy = QualType::getFromOpaquePtr(Ty); 674 675 QualType resultType = 676 CheckSizeOfAlignOfOperand(ArgTy, OpLoc, SourceRange(LPLoc, RPLoc),isSizeof); 677 678 if (resultType.isNull()) 679 return true; 680 return new SizeOfAlignOfTypeExpr(isSizeof, ArgTy, resultType, OpLoc, RPLoc); 681} 682 683QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 684 DefaultFunctionArrayConversion(V); 685 686 // These operators return the element type of a complex type. 687 if (const ComplexType *CT = V->getType()->getAsComplexType()) 688 return CT->getElementType(); 689 690 // Otherwise they pass through real integer and floating point types here. 691 if (V->getType()->isArithmeticType()) 692 return V->getType(); 693 694 // Reject anything else. 695 Diag(Loc, diag::err_realimag_invalid_type, V->getType().getAsString()); 696 return QualType(); 697} 698 699 700 701Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 702 tok::TokenKind Kind, 703 ExprTy *Input) { 704 UnaryOperator::Opcode Opc; 705 switch (Kind) { 706 default: assert(0 && "Unknown unary op!"); 707 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 708 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 709 } 710 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 711 if (result.isNull()) 712 return true; 713 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 714} 715 716Action::ExprResult Sema:: 717ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 718 ExprTy *Idx, SourceLocation RLoc) { 719 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 720 721 // Perform default conversions. 722 DefaultFunctionArrayConversion(LHSExp); 723 DefaultFunctionArrayConversion(RHSExp); 724 725 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 726 727 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 728 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 729 // in the subscript position. As a result, we need to derive the array base 730 // and index from the expression types. 731 Expr *BaseExpr, *IndexExpr; 732 QualType ResultType; 733 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 734 BaseExpr = LHSExp; 735 IndexExpr = RHSExp; 736 // FIXME: need to deal with const... 737 ResultType = PTy->getPointeeType(); 738 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 739 // Handle the uncommon case of "123[Ptr]". 740 BaseExpr = RHSExp; 741 IndexExpr = LHSExp; 742 // FIXME: need to deal with const... 743 ResultType = PTy->getPointeeType(); 744 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 745 BaseExpr = LHSExp; // vectors: V[123] 746 IndexExpr = RHSExp; 747 748 // Component access limited to variables (reject vec4.rg[1]). 749 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 750 !isa<ExtVectorElementExpr>(BaseExpr)) 751 return Diag(LLoc, diag::err_ext_vector_component_access, 752 SourceRange(LLoc, RLoc)); 753 // FIXME: need to deal with const... 754 ResultType = VTy->getElementType(); 755 } else { 756 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value, 757 RHSExp->getSourceRange()); 758 } 759 // C99 6.5.2.1p1 760 if (!IndexExpr->getType()->isIntegerType()) 761 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript, 762 IndexExpr->getSourceRange()); 763 764 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 765 // the following check catches trying to index a pointer to a function (e.g. 766 // void (*)(int)) and pointers to incomplete types. Functions are not 767 // objects in C99. 768 if (!ResultType->isObjectType()) 769 return Diag(BaseExpr->getLocStart(), 770 diag::err_typecheck_subscript_not_object, 771 BaseExpr->getType().getAsString(), BaseExpr->getSourceRange()); 772 773 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 774} 775 776QualType Sema:: 777CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 778 IdentifierInfo &CompName, SourceLocation CompLoc) { 779 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 780 781 // This flag determines whether or not the component is to be treated as a 782 // special name, or a regular GLSL-style component access. 783 bool SpecialComponent = false; 784 785 // The vector accessor can't exceed the number of elements. 786 const char *compStr = CompName.getName(); 787 if (strlen(compStr) > vecType->getNumElements()) { 788 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 789 baseType.getAsString(), SourceRange(CompLoc)); 790 return QualType(); 791 } 792 793 // Check that we've found one of the special components, or that the component 794 // names must come from the same set. 795 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 796 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 797 SpecialComponent = true; 798 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 799 do 800 compStr++; 801 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 802 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 803 do 804 compStr++; 805 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 806 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 807 do 808 compStr++; 809 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 810 } 811 812 if (!SpecialComponent && *compStr) { 813 // We didn't get to the end of the string. This means the component names 814 // didn't come from the same set *or* we encountered an illegal name. 815 Diag(OpLoc, diag::err_ext_vector_component_name_illegal, 816 std::string(compStr,compStr+1), SourceRange(CompLoc)); 817 return QualType(); 818 } 819 // Each component accessor can't exceed the vector type. 820 compStr = CompName.getName(); 821 while (*compStr) { 822 if (vecType->isAccessorWithinNumElements(*compStr)) 823 compStr++; 824 else 825 break; 826 } 827 if (!SpecialComponent && *compStr) { 828 // We didn't get to the end of the string. This means a component accessor 829 // exceeds the number of elements in the vector. 830 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 831 baseType.getAsString(), SourceRange(CompLoc)); 832 return QualType(); 833 } 834 835 // If we have a special component name, verify that the current vector length 836 // is an even number, since all special component names return exactly half 837 // the elements. 838 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 839 Diag(OpLoc, diag::err_ext_vector_component_requires_even, 840 baseType.getAsString(), SourceRange(CompLoc)); 841 return QualType(); 842 } 843 844 // The component accessor looks fine - now we need to compute the actual type. 845 // The vector type is implied by the component accessor. For example, 846 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 847 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 848 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 849 : strlen(CompName.getName()); 850 if (CompSize == 1) 851 return vecType->getElementType(); 852 853 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 854 // Now look up the TypeDefDecl from the vector type. Without this, 855 // diagostics look bad. We want extended vector types to appear built-in. 856 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 857 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 858 return Context.getTypedefType(ExtVectorDecls[i]); 859 } 860 return VT; // should never get here (a typedef type should always be found). 861} 862 863/// constructSetterName - Return the setter name for the given 864/// identifier, i.e. "set" + Name where the initial character of Name 865/// has been capitalized. 866// FIXME: Merge with same routine in Parser. But where should this 867// live? 868static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 869 const IdentifierInfo *Name) { 870 unsigned N = Name->getLength(); 871 char *SelectorName = new char[3 + N]; 872 memcpy(SelectorName, "set", 3); 873 memcpy(&SelectorName[3], Name->getName(), N); 874 SelectorName[3] = toupper(SelectorName[3]); 875 876 IdentifierInfo *Setter = 877 &Idents.get(SelectorName, &SelectorName[3 + N]); 878 delete[] SelectorName; 879 return Setter; 880} 881 882Action::ExprResult Sema:: 883ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 884 tok::TokenKind OpKind, SourceLocation MemberLoc, 885 IdentifierInfo &Member) { 886 Expr *BaseExpr = static_cast<Expr *>(Base); 887 assert(BaseExpr && "no record expression"); 888 889 // Perform default conversions. 890 DefaultFunctionArrayConversion(BaseExpr); 891 892 QualType BaseType = BaseExpr->getType(); 893 assert(!BaseType.isNull() && "no type for member expression"); 894 895 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 896 // must have pointer type, and the accessed type is the pointee. 897 if (OpKind == tok::arrow) { 898 if (const PointerType *PT = BaseType->getAsPointerType()) 899 BaseType = PT->getPointeeType(); 900 else 901 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow, 902 BaseType.getAsString(), BaseExpr->getSourceRange()); 903 } 904 905 // Handle field access to simple records. This also handles access to fields 906 // of the ObjC 'id' struct. 907 if (const RecordType *RTy = BaseType->getAsRecordType()) { 908 RecordDecl *RDecl = RTy->getDecl(); 909 if (RTy->isIncompleteType()) 910 return Diag(OpLoc, diag::err_typecheck_incomplete_tag, RDecl->getName(), 911 BaseExpr->getSourceRange()); 912 // The record definition is complete, now make sure the member is valid. 913 FieldDecl *MemberDecl = RDecl->getMember(&Member); 914 if (!MemberDecl) 915 return Diag(MemberLoc, diag::err_typecheck_no_member, Member.getName(), 916 BaseExpr->getSourceRange()); 917 918 // Figure out the type of the member; see C99 6.5.2.3p3 919 // FIXME: Handle address space modifiers 920 QualType MemberType = MemberDecl->getType(); 921 unsigned combinedQualifiers = 922 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 923 MemberType = MemberType.getQualifiedType(combinedQualifiers); 924 925 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 926 MemberLoc, MemberType); 927 } 928 929 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 930 // (*Obj).ivar. 931 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 932 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) 933 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 934 OpKind == tok::arrow); 935 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar, 936 IFTy->getDecl()->getName(), Member.getName(), 937 BaseExpr->getSourceRange()); 938 } 939 940 // Handle Objective-C property access, which is "Obj.property" where Obj is a 941 // pointer to a (potentially qualified) interface type. 942 const PointerType *PTy; 943 const ObjCInterfaceType *IFTy; 944 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 945 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 946 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 947 948 // Search for a declared property first. 949 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 950 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 951 952 // Check protocols on qualified interfaces. 953 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 954 E = IFTy->qual_end(); I != E; ++I) 955 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 956 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 957 958 // If that failed, look for an "implicit" property by seeing if the nullary 959 // selector is implemented. 960 961 // FIXME: The logic for looking up nullary and unary selectors should be 962 // shared with the code in ActOnInstanceMessage. 963 964 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 965 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 966 967 // If this reference is in an @implementation, check for 'private' methods. 968 if (!Getter) 969 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 970 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 971 if (ObjCImplementationDecl *ImpDecl = 972 ObjCImplementations[ClassDecl->getIdentifier()]) 973 Getter = ImpDecl->getInstanceMethod(Sel); 974 975 // Look through local category implementations associated with the class. 976 if (!Getter) { 977 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 978 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 979 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 980 } 981 } 982 if (Getter) { 983 // If we found a getter then this may be a valid dot-reference, we 984 // need to also look for the matching setter. 985 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 986 &Member); 987 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 988 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 989 990 if (!Setter) { 991 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 992 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 993 if (ObjCImplementationDecl *ImpDecl = 994 ObjCImplementations[ClassDecl->getIdentifier()]) 995 Setter = ImpDecl->getInstanceMethod(SetterSel); 996 } 997 998 // FIXME: There are some issues here. First, we are not 999 // diagnosing accesses to read-only properties because we do not 1000 // know if this is a getter or setter yet. Second, we are 1001 // checking that the type of the setter matches the type we 1002 // expect. 1003 return new ObjCPropertyRefExpr(Getter, Setter, Getter->getResultType(), 1004 MemberLoc, BaseExpr); 1005 } 1006 } 1007 // Handle properties on qualified "id" protocols. 1008 const ObjCQualifiedIdType *QIdTy; 1009 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1010 // Check protocols on qualified interfaces. 1011 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1012 E = QIdTy->qual_end(); I != E; ++I) 1013 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1014 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1015 } 1016 // Handle 'field access' to vectors, such as 'V.xx'. 1017 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1018 // Component access limited to variables (reject vec4.rg.g). 1019 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1020 !isa<ExtVectorElementExpr>(BaseExpr)) 1021 return Diag(MemberLoc, diag::err_ext_vector_component_access, 1022 BaseExpr->getSourceRange()); 1023 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1024 if (ret.isNull()) 1025 return true; 1026 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1027 } 1028 1029 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union, 1030 BaseType.getAsString(), BaseExpr->getSourceRange()); 1031} 1032 1033/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1034/// This provides the location of the left/right parens and a list of comma 1035/// locations. 1036Action::ExprResult Sema:: 1037ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 1038 ExprTy **args, unsigned NumArgs, 1039 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1040 Expr *Fn = static_cast<Expr *>(fn); 1041 Expr **Args = reinterpret_cast<Expr**>(args); 1042 assert(Fn && "no function call expression"); 1043 FunctionDecl *FDecl = NULL; 1044 OverloadedFunctionDecl *Ovl = NULL; 1045 1046 // If we're directly calling a function or a set of overloaded 1047 // functions, get the appropriate declaration. 1048 { 1049 DeclRefExpr *DRExpr = NULL; 1050 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1051 DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()); 1052 else 1053 DRExpr = dyn_cast<DeclRefExpr>(Fn); 1054 1055 if (DRExpr) { 1056 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1057 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1058 } 1059 } 1060 1061 // If we have a set of overloaded functions, perform overload 1062 // resolution to pick the function. 1063 if (Ovl) { 1064 OverloadCandidateSet CandidateSet; 1065 OverloadCandidateSet::iterator Best; 1066 AddOverloadCandidates(Ovl, Args, NumArgs, CandidateSet); 1067 switch (BestViableFunction(CandidateSet, Best)) { 1068 case OR_Success: 1069 { 1070 // Success! Let the remainder of this function build a call to 1071 // the function selected by overload resolution. 1072 FDecl = Best->Function; 1073 Expr *NewFn = new DeclRefExpr(FDecl, FDecl->getType(), 1074 Fn->getSourceRange().getBegin()); 1075 delete Fn; 1076 Fn = NewFn; 1077 } 1078 break; 1079 1080 case OR_No_Viable_Function: 1081 if (CandidateSet.empty()) 1082 Diag(Fn->getSourceRange().getBegin(), 1083 diag::err_ovl_no_viable_function_in_call, Ovl->getName(), 1084 Fn->getSourceRange()); 1085 else { 1086 Diag(Fn->getSourceRange().getBegin(), 1087 diag::err_ovl_no_viable_function_in_call_with_cands, 1088 Ovl->getName(), Fn->getSourceRange()); 1089 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1090 } 1091 return true; 1092 1093 case OR_Ambiguous: 1094 Diag(Fn->getSourceRange().getBegin(), 1095 diag::err_ovl_ambiguous_call, Ovl->getName(), 1096 Fn->getSourceRange()); 1097 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1098 return true; 1099 } 1100 } 1101 1102 // Promote the function operand. 1103 UsualUnaryConversions(Fn); 1104 1105 // Make the call expr early, before semantic checks. This guarantees cleanup 1106 // of arguments and function on error. 1107 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1108 Context.BoolTy, RParenLoc)); 1109 const FunctionType *FuncT; 1110 if (!Fn->getType()->isBlockPointerType()) { 1111 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1112 // have type pointer to function". 1113 const PointerType *PT = Fn->getType()->getAsPointerType(); 1114 if (PT == 0) 1115 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1116 Fn->getSourceRange()); 1117 FuncT = PT->getPointeeType()->getAsFunctionType(); 1118 } else { // This is a block call. 1119 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1120 getAsFunctionType(); 1121 } 1122 if (FuncT == 0) 1123 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1124 Fn->getSourceRange()); 1125 1126 // We know the result type of the call, set it. 1127 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 1128 1129 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1130 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1131 // assignment, to the types of the corresponding parameter, ... 1132 unsigned NumArgsInProto = Proto->getNumArgs(); 1133 unsigned NumArgsToCheck = NumArgs; 1134 1135 // If too few arguments are available (and we don't have default 1136 // arguments for the remaining parameters), don't make the call. 1137 if (NumArgs < NumArgsInProto) { 1138 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 1139 // Use default arguments for missing arguments 1140 NumArgsToCheck = NumArgsInProto; 1141 TheCall->setNumArgs(NumArgsInProto); 1142 } else 1143 return Diag(RParenLoc, 1144 !Fn->getType()->isBlockPointerType() 1145 ? diag::err_typecheck_call_too_few_args 1146 : diag::err_typecheck_block_too_few_args, 1147 Fn->getSourceRange()); 1148 } 1149 1150 // If too many are passed and not variadic, error on the extras and drop 1151 // them. 1152 if (NumArgs > NumArgsInProto) { 1153 if (!Proto->isVariadic()) { 1154 Diag(Args[NumArgsInProto]->getLocStart(), 1155 !Fn->getType()->isBlockPointerType() 1156 ? diag::err_typecheck_call_too_many_args 1157 : diag::err_typecheck_block_too_many_args, 1158 Fn->getSourceRange(), 1159 SourceRange(Args[NumArgsInProto]->getLocStart(), 1160 Args[NumArgs-1]->getLocEnd())); 1161 // This deletes the extra arguments. 1162 TheCall->setNumArgs(NumArgsInProto); 1163 } 1164 NumArgsToCheck = NumArgsInProto; 1165 } 1166 1167 // Continue to check argument types (even if we have too few/many args). 1168 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1169 QualType ProtoArgType = Proto->getArgType(i); 1170 1171 Expr *Arg; 1172 if (i < NumArgs) 1173 Arg = Args[i]; 1174 else 1175 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1176 QualType ArgType = Arg->getType(); 1177 1178 // Pass the argument. 1179 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 1180 return true; 1181 1182 TheCall->setArg(i, Arg); 1183 } 1184 1185 // If this is a variadic call, handle args passed through "...". 1186 if (Proto->isVariadic()) { 1187 // Promote the arguments (C99 6.5.2.2p7). 1188 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1189 Expr *Arg = Args[i]; 1190 DefaultArgumentPromotion(Arg); 1191 TheCall->setArg(i, Arg); 1192 } 1193 } 1194 } else { 1195 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1196 1197 // Promote the arguments (C99 6.5.2.2p6). 1198 for (unsigned i = 0; i != NumArgs; i++) { 1199 Expr *Arg = Args[i]; 1200 DefaultArgumentPromotion(Arg); 1201 TheCall->setArg(i, Arg); 1202 } 1203 } 1204 1205 // Do special checking on direct calls to functions. 1206 if (FDecl) 1207 return CheckFunctionCall(FDecl, TheCall.take()); 1208 1209 return TheCall.take(); 1210} 1211 1212Action::ExprResult Sema:: 1213ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1214 SourceLocation RParenLoc, ExprTy *InitExpr) { 1215 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1216 QualType literalType = QualType::getFromOpaquePtr(Ty); 1217 // FIXME: put back this assert when initializers are worked out. 1218 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1219 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1220 1221 if (literalType->isArrayType()) { 1222 if (literalType->isVariableArrayType()) 1223 return Diag(LParenLoc, 1224 diag::err_variable_object_no_init, 1225 SourceRange(LParenLoc, 1226 literalExpr->getSourceRange().getEnd())); 1227 } else if (literalType->isIncompleteType()) { 1228 return Diag(LParenLoc, 1229 diag::err_typecheck_decl_incomplete_type, 1230 literalType.getAsString(), 1231 SourceRange(LParenLoc, 1232 literalExpr->getSourceRange().getEnd())); 1233 } 1234 1235 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 1236 "temporary")) 1237 return true; 1238 1239 bool isFileScope = !getCurFunctionDecl() && !getCurMethodDecl(); 1240 if (isFileScope) { // 6.5.2.5p3 1241 if (CheckForConstantInitializer(literalExpr, literalType)) 1242 return true; 1243 } 1244 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, 1245 isFileScope); 1246} 1247 1248Action::ExprResult Sema:: 1249ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1250 InitListDesignations &Designators, 1251 SourceLocation RBraceLoc) { 1252 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1253 1254 // Semantic analysis for initializers is done by ActOnDeclarator() and 1255 // CheckInitializer() - it requires knowledge of the object being intialized. 1256 1257 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc, 1258 Designators.hasAnyDesignators()); 1259 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1260 return E; 1261} 1262 1263/// CheckCastTypes - Check type constraints for casting between types. 1264bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1265 UsualUnaryConversions(castExpr); 1266 1267 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1268 // type needs to be scalar. 1269 if (castType->isVoidType()) { 1270 // Cast to void allows any expr type. 1271 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1272 // GCC struct/union extension: allow cast to self. 1273 if (Context.getCanonicalType(castType) != 1274 Context.getCanonicalType(castExpr->getType()) || 1275 (!castType->isStructureType() && !castType->isUnionType())) { 1276 // Reject any other conversions to non-scalar types. 1277 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar, 1278 castType.getAsString(), castExpr->getSourceRange()); 1279 } 1280 1281 // accept this, but emit an ext-warn. 1282 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar, 1283 castType.getAsString(), castExpr->getSourceRange()); 1284 } else if (!castExpr->getType()->isScalarType() && 1285 !castExpr->getType()->isVectorType()) { 1286 return Diag(castExpr->getLocStart(), 1287 diag::err_typecheck_expect_scalar_operand, 1288 castExpr->getType().getAsString(),castExpr->getSourceRange()); 1289 } else if (castExpr->getType()->isVectorType()) { 1290 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1291 return true; 1292 } else if (castType->isVectorType()) { 1293 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1294 return true; 1295 } 1296 return false; 1297} 1298 1299bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1300 assert(VectorTy->isVectorType() && "Not a vector type!"); 1301 1302 if (Ty->isVectorType() || Ty->isIntegerType()) { 1303 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1304 return Diag(R.getBegin(), 1305 Ty->isVectorType() ? 1306 diag::err_invalid_conversion_between_vectors : 1307 diag::err_invalid_conversion_between_vector_and_integer, 1308 VectorTy.getAsString().c_str(), 1309 Ty.getAsString().c_str(), R); 1310 } else 1311 return Diag(R.getBegin(), 1312 diag::err_invalid_conversion_between_vector_and_scalar, 1313 VectorTy.getAsString().c_str(), 1314 Ty.getAsString().c_str(), R); 1315 1316 return false; 1317} 1318 1319Action::ExprResult Sema:: 1320ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1321 SourceLocation RParenLoc, ExprTy *Op) { 1322 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1323 1324 Expr *castExpr = static_cast<Expr*>(Op); 1325 QualType castType = QualType::getFromOpaquePtr(Ty); 1326 1327 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1328 return true; 1329 return new CStyleCastExpr(castType, castExpr, castType, LParenLoc, RParenLoc); 1330} 1331 1332/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1333/// In that case, lex = cond. 1334inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1335 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1336 UsualUnaryConversions(cond); 1337 UsualUnaryConversions(lex); 1338 UsualUnaryConversions(rex); 1339 QualType condT = cond->getType(); 1340 QualType lexT = lex->getType(); 1341 QualType rexT = rex->getType(); 1342 1343 // first, check the condition. 1344 if (!condT->isScalarType()) { // C99 6.5.15p2 1345 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 1346 condT.getAsString()); 1347 return QualType(); 1348 } 1349 1350 // Now check the two expressions. 1351 1352 // If both operands have arithmetic type, do the usual arithmetic conversions 1353 // to find a common type: C99 6.5.15p3,5. 1354 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1355 UsualArithmeticConversions(lex, rex); 1356 return lex->getType(); 1357 } 1358 1359 // If both operands are the same structure or union type, the result is that 1360 // type. 1361 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1362 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1363 if (LHSRT->getDecl() == RHSRT->getDecl()) 1364 // "If both the operands have structure or union type, the result has 1365 // that type." This implies that CV qualifiers are dropped. 1366 return lexT.getUnqualifiedType(); 1367 } 1368 1369 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1370 // The following || allows only one side to be void (a GCC-ism). 1371 if (lexT->isVoidType() || rexT->isVoidType()) { 1372 if (!lexT->isVoidType()) 1373 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 1374 rex->getSourceRange()); 1375 if (!rexT->isVoidType()) 1376 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 1377 lex->getSourceRange()); 1378 ImpCastExprToType(lex, Context.VoidTy); 1379 ImpCastExprToType(rex, Context.VoidTy); 1380 return Context.VoidTy; 1381 } 1382 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1383 // the type of the other operand." 1384 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1385 Context.isObjCObjectPointerType(lexT)) && 1386 rex->isNullPointerConstant(Context)) { 1387 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1388 return lexT; 1389 } 1390 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1391 Context.isObjCObjectPointerType(rexT)) && 1392 lex->isNullPointerConstant(Context)) { 1393 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1394 return rexT; 1395 } 1396 // Handle the case where both operands are pointers before we handle null 1397 // pointer constants in case both operands are null pointer constants. 1398 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1399 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1400 // get the "pointed to" types 1401 QualType lhptee = LHSPT->getPointeeType(); 1402 QualType rhptee = RHSPT->getPointeeType(); 1403 1404 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1405 if (lhptee->isVoidType() && 1406 rhptee->isIncompleteOrObjectType()) { 1407 // Figure out necessary qualifiers (C99 6.5.15p6) 1408 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1409 QualType destType = Context.getPointerType(destPointee); 1410 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1411 ImpCastExprToType(rex, destType); // promote to void* 1412 return destType; 1413 } 1414 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1415 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1416 QualType destType = Context.getPointerType(destPointee); 1417 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1418 ImpCastExprToType(rex, destType); // promote to void* 1419 return destType; 1420 } 1421 1422 QualType compositeType = lexT; 1423 1424 // If either type is an Objective-C object type then check 1425 // compatibility according to Objective-C. 1426 if (Context.isObjCObjectPointerType(lexT) || 1427 Context.isObjCObjectPointerType(rexT)) { 1428 // If both operands are interfaces and either operand can be 1429 // assigned to the other, use that type as the composite 1430 // type. This allows 1431 // xxx ? (A*) a : (B*) b 1432 // where B is a subclass of A. 1433 // 1434 // Additionally, as for assignment, if either type is 'id' 1435 // allow silent coercion. Finally, if the types are 1436 // incompatible then make sure to use 'id' as the composite 1437 // type so the result is acceptable for sending messages to. 1438 1439 // FIXME: This code should not be localized to here. Also this 1440 // should use a compatible check instead of abusing the 1441 // canAssignObjCInterfaces code. 1442 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1443 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1444 if (LHSIface && RHSIface && 1445 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1446 compositeType = lexT; 1447 } else if (LHSIface && RHSIface && 1448 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1449 compositeType = rexT; 1450 } else if (Context.isObjCIdType(lhptee) || 1451 Context.isObjCIdType(rhptee)) { 1452 // FIXME: This code looks wrong, because isObjCIdType checks 1453 // the struct but getObjCIdType returns the pointer to 1454 // struct. This is horrible and should be fixed. 1455 compositeType = Context.getObjCIdType(); 1456 } else { 1457 QualType incompatTy = Context.getObjCIdType(); 1458 ImpCastExprToType(lex, incompatTy); 1459 ImpCastExprToType(rex, incompatTy); 1460 return incompatTy; 1461 } 1462 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1463 rhptee.getUnqualifiedType())) { 1464 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 1465 lexT.getAsString(), rexT.getAsString(), 1466 lex->getSourceRange(), rex->getSourceRange()); 1467 // In this situation, we assume void* type. No especially good 1468 // reason, but this is what gcc does, and we do have to pick 1469 // to get a consistent AST. 1470 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1471 ImpCastExprToType(lex, incompatTy); 1472 ImpCastExprToType(rex, incompatTy); 1473 return incompatTy; 1474 } 1475 // The pointer types are compatible. 1476 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1477 // differently qualified versions of compatible types, the result type is 1478 // a pointer to an appropriately qualified version of the *composite* 1479 // type. 1480 // FIXME: Need to calculate the composite type. 1481 // FIXME: Need to add qualifiers 1482 ImpCastExprToType(lex, compositeType); 1483 ImpCastExprToType(rex, compositeType); 1484 return compositeType; 1485 } 1486 } 1487 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1488 // evaluates to "struct objc_object *" (and is handled above when comparing 1489 // id with statically typed objects). 1490 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1491 // GCC allows qualified id and any Objective-C type to devolve to 1492 // id. Currently localizing to here until clear this should be 1493 // part of ObjCQualifiedIdTypesAreCompatible. 1494 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1495 (lexT->isObjCQualifiedIdType() && 1496 Context.isObjCObjectPointerType(rexT)) || 1497 (rexT->isObjCQualifiedIdType() && 1498 Context.isObjCObjectPointerType(lexT))) { 1499 // FIXME: This is not the correct composite type. This only 1500 // happens to work because id can more or less be used anywhere, 1501 // however this may change the type of method sends. 1502 // FIXME: gcc adds some type-checking of the arguments and emits 1503 // (confusing) incompatible comparison warnings in some 1504 // cases. Investigate. 1505 QualType compositeType = Context.getObjCIdType(); 1506 ImpCastExprToType(lex, compositeType); 1507 ImpCastExprToType(rex, compositeType); 1508 return compositeType; 1509 } 1510 } 1511 1512 // Selection between block pointer types is ok as long as they are the same. 1513 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1514 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1515 return lexT; 1516 1517 // Otherwise, the operands are not compatible. 1518 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 1519 lexT.getAsString(), rexT.getAsString(), 1520 lex->getSourceRange(), rex->getSourceRange()); 1521 return QualType(); 1522} 1523 1524/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1525/// in the case of a the GNU conditional expr extension. 1526Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1527 SourceLocation ColonLoc, 1528 ExprTy *Cond, ExprTy *LHS, 1529 ExprTy *RHS) { 1530 Expr *CondExpr = (Expr *) Cond; 1531 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1532 1533 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1534 // was the condition. 1535 bool isLHSNull = LHSExpr == 0; 1536 if (isLHSNull) 1537 LHSExpr = CondExpr; 1538 1539 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1540 RHSExpr, QuestionLoc); 1541 if (result.isNull()) 1542 return true; 1543 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1544 RHSExpr, result); 1545} 1546 1547 1548// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1549// being closely modeled after the C99 spec:-). The odd characteristic of this 1550// routine is it effectively iqnores the qualifiers on the top level pointee. 1551// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1552// FIXME: add a couple examples in this comment. 1553Sema::AssignConvertType 1554Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1555 QualType lhptee, rhptee; 1556 1557 // get the "pointed to" type (ignoring qualifiers at the top level) 1558 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1559 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1560 1561 // make sure we operate on the canonical type 1562 lhptee = Context.getCanonicalType(lhptee); 1563 rhptee = Context.getCanonicalType(rhptee); 1564 1565 AssignConvertType ConvTy = Compatible; 1566 1567 // C99 6.5.16.1p1: This following citation is common to constraints 1568 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1569 // qualifiers of the type *pointed to* by the right; 1570 // FIXME: Handle ASQualType 1571 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 1572 ConvTy = CompatiblePointerDiscardsQualifiers; 1573 1574 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1575 // incomplete type and the other is a pointer to a qualified or unqualified 1576 // version of void... 1577 if (lhptee->isVoidType()) { 1578 if (rhptee->isIncompleteOrObjectType()) 1579 return ConvTy; 1580 1581 // As an extension, we allow cast to/from void* to function pointer. 1582 assert(rhptee->isFunctionType()); 1583 return FunctionVoidPointer; 1584 } 1585 1586 if (rhptee->isVoidType()) { 1587 if (lhptee->isIncompleteOrObjectType()) 1588 return ConvTy; 1589 1590 // As an extension, we allow cast to/from void* to function pointer. 1591 assert(lhptee->isFunctionType()); 1592 return FunctionVoidPointer; 1593 } 1594 1595 // Check for ObjC interfaces 1596 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1597 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1598 if (LHSIface && RHSIface && 1599 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1600 return ConvTy; 1601 1602 // ID acts sort of like void* for ObjC interfaces 1603 if (LHSIface && Context.isObjCIdType(rhptee)) 1604 return ConvTy; 1605 if (RHSIface && Context.isObjCIdType(lhptee)) 1606 return ConvTy; 1607 1608 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1609 // unqualified versions of compatible types, ... 1610 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1611 rhptee.getUnqualifiedType())) 1612 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1613 return ConvTy; 1614} 1615 1616/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1617/// block pointer types are compatible or whether a block and normal pointer 1618/// are compatible. It is more restrict than comparing two function pointer 1619// types. 1620Sema::AssignConvertType 1621Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1622 QualType rhsType) { 1623 QualType lhptee, rhptee; 1624 1625 // get the "pointed to" type (ignoring qualifiers at the top level) 1626 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1627 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1628 1629 // make sure we operate on the canonical type 1630 lhptee = Context.getCanonicalType(lhptee); 1631 rhptee = Context.getCanonicalType(rhptee); 1632 1633 AssignConvertType ConvTy = Compatible; 1634 1635 // For blocks we enforce that qualifiers are identical. 1636 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1637 ConvTy = CompatiblePointerDiscardsQualifiers; 1638 1639 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1640 return IncompatibleBlockPointer; 1641 return ConvTy; 1642} 1643 1644/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1645/// has code to accommodate several GCC extensions when type checking 1646/// pointers. Here are some objectionable examples that GCC considers warnings: 1647/// 1648/// int a, *pint; 1649/// short *pshort; 1650/// struct foo *pfoo; 1651/// 1652/// pint = pshort; // warning: assignment from incompatible pointer type 1653/// a = pint; // warning: assignment makes integer from pointer without a cast 1654/// pint = a; // warning: assignment makes pointer from integer without a cast 1655/// pint = pfoo; // warning: assignment from incompatible pointer type 1656/// 1657/// As a result, the code for dealing with pointers is more complex than the 1658/// C99 spec dictates. 1659/// 1660Sema::AssignConvertType 1661Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1662 // Get canonical types. We're not formatting these types, just comparing 1663 // them. 1664 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1665 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1666 1667 if (lhsType == rhsType) 1668 return Compatible; // Common case: fast path an exact match. 1669 1670 // If the left-hand side is a reference type, then we are in a 1671 // (rare!) case where we've allowed the use of references in C, 1672 // e.g., as a parameter type in a built-in function. In this case, 1673 // just make sure that the type referenced is compatible with the 1674 // right-hand side type. The caller is responsible for adjusting 1675 // lhsType so that the resulting expression does not have reference 1676 // type. 1677 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 1678 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 1679 return Compatible; 1680 return Incompatible; 1681 } 1682 1683 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1684 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1685 return Compatible; 1686 // Relax integer conversions like we do for pointers below. 1687 if (rhsType->isIntegerType()) 1688 return IntToPointer; 1689 if (lhsType->isIntegerType()) 1690 return PointerToInt; 1691 return IncompatibleObjCQualifiedId; 1692 } 1693 1694 if (lhsType->isVectorType() || rhsType->isVectorType()) { 1695 // For ExtVector, allow vector splats; float -> <n x float> 1696 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 1697 if (LV->getElementType() == rhsType) 1698 return Compatible; 1699 1700 // If we are allowing lax vector conversions, and LHS and RHS are both 1701 // vectors, the total size only needs to be the same. This is a bitcast; 1702 // no bits are changed but the result type is different. 1703 if (getLangOptions().LaxVectorConversions && 1704 lhsType->isVectorType() && rhsType->isVectorType()) { 1705 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1706 return Compatible; 1707 } 1708 return Incompatible; 1709 } 1710 1711 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1712 return Compatible; 1713 1714 if (isa<PointerType>(lhsType)) { 1715 if (rhsType->isIntegerType()) 1716 return IntToPointer; 1717 1718 if (isa<PointerType>(rhsType)) 1719 return CheckPointerTypesForAssignment(lhsType, rhsType); 1720 1721 if (rhsType->getAsBlockPointerType()) { 1722 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1723 return BlockVoidPointer; 1724 1725 // Treat block pointers as objects. 1726 if (getLangOptions().ObjC1 && 1727 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 1728 return Compatible; 1729 } 1730 return Incompatible; 1731 } 1732 1733 if (isa<BlockPointerType>(lhsType)) { 1734 if (rhsType->isIntegerType()) 1735 return IntToPointer; 1736 1737 // Treat block pointers as objects. 1738 if (getLangOptions().ObjC1 && 1739 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 1740 return Compatible; 1741 1742 if (rhsType->isBlockPointerType()) 1743 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 1744 1745 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 1746 if (RHSPT->getPointeeType()->isVoidType()) 1747 return BlockVoidPointer; 1748 } 1749 return Incompatible; 1750 } 1751 1752 if (isa<PointerType>(rhsType)) { 1753 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1754 if (lhsType == Context.BoolTy) 1755 return Compatible; 1756 1757 if (lhsType->isIntegerType()) 1758 return PointerToInt; 1759 1760 if (isa<PointerType>(lhsType)) 1761 return CheckPointerTypesForAssignment(lhsType, rhsType); 1762 1763 if (isa<BlockPointerType>(lhsType) && 1764 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1765 return BlockVoidPointer; 1766 return Incompatible; 1767 } 1768 1769 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1770 if (Context.typesAreCompatible(lhsType, rhsType)) 1771 return Compatible; 1772 } 1773 return Incompatible; 1774} 1775 1776Sema::AssignConvertType 1777Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1778 if (getLangOptions().CPlusPlus) { 1779 if (!lhsType->isRecordType()) { 1780 // C++ 5.17p3: If the left operand is not of class type, the 1781 // expression is implicitly converted (C++ 4) to the 1782 // cv-unqualified type of the left operand. 1783 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType())) 1784 return Incompatible; 1785 else 1786 return Compatible; 1787 } 1788 1789 // FIXME: Currently, we fall through and treat C++ classes like C 1790 // structures. 1791 } 1792 1793 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1794 // a null pointer constant. 1795 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 1796 lhsType->isBlockPointerType()) 1797 && rExpr->isNullPointerConstant(Context)) { 1798 ImpCastExprToType(rExpr, lhsType); 1799 return Compatible; 1800 } 1801 1802 // We don't allow conversion of non-null-pointer constants to integers. 1803 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 1804 return IntToBlockPointer; 1805 1806 // This check seems unnatural, however it is necessary to ensure the proper 1807 // conversion of functions/arrays. If the conversion were done for all 1808 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1809 // expressions that surpress this implicit conversion (&, sizeof). 1810 // 1811 // Suppress this for references: C++ 8.5.3p5. 1812 if (!lhsType->isReferenceType()) 1813 DefaultFunctionArrayConversion(rExpr); 1814 1815 Sema::AssignConvertType result = 1816 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1817 1818 // C99 6.5.16.1p2: The value of the right operand is converted to the 1819 // type of the assignment expression. 1820 // CheckAssignmentConstraints allows the left-hand side to be a reference, 1821 // so that we can use references in built-in functions even in C. 1822 // The getNonReferenceType() call makes sure that the resulting expression 1823 // does not have reference type. 1824 if (rExpr->getType() != lhsType) 1825 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 1826 return result; 1827} 1828 1829Sema::AssignConvertType 1830Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1831 return CheckAssignmentConstraints(lhsType, rhsType); 1832} 1833 1834QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1835 Diag(loc, diag::err_typecheck_invalid_operands, 1836 lex->getType().getAsString(), rex->getType().getAsString(), 1837 lex->getSourceRange(), rex->getSourceRange()); 1838 return QualType(); 1839} 1840 1841inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1842 Expr *&rex) { 1843 // For conversion purposes, we ignore any qualifiers. 1844 // For example, "const float" and "float" are equivalent. 1845 QualType lhsType = 1846 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 1847 QualType rhsType = 1848 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 1849 1850 // If the vector types are identical, return. 1851 if (lhsType == rhsType) 1852 return lhsType; 1853 1854 // Handle the case of a vector & extvector type of the same size and element 1855 // type. It would be nice if we only had one vector type someday. 1856 if (getLangOptions().LaxVectorConversions) 1857 if (const VectorType *LV = lhsType->getAsVectorType()) 1858 if (const VectorType *RV = rhsType->getAsVectorType()) 1859 if (LV->getElementType() == RV->getElementType() && 1860 LV->getNumElements() == RV->getNumElements()) 1861 return lhsType->isExtVectorType() ? lhsType : rhsType; 1862 1863 // If the lhs is an extended vector and the rhs is a scalar of the same type 1864 // or a literal, promote the rhs to the vector type. 1865 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1866 QualType eltType = V->getElementType(); 1867 1868 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 1869 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 1870 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 1871 ImpCastExprToType(rex, lhsType); 1872 return lhsType; 1873 } 1874 } 1875 1876 // If the rhs is an extended vector and the lhs is a scalar of the same type, 1877 // promote the lhs to the vector type. 1878 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1879 QualType eltType = V->getElementType(); 1880 1881 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 1882 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 1883 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 1884 ImpCastExprToType(lex, rhsType); 1885 return rhsType; 1886 } 1887 } 1888 1889 // You cannot convert between vector values of different size. 1890 Diag(loc, diag::err_typecheck_vector_not_convertable, 1891 lex->getType().getAsString(), rex->getType().getAsString(), 1892 lex->getSourceRange(), rex->getSourceRange()); 1893 return QualType(); 1894} 1895 1896inline QualType Sema::CheckMultiplyDivideOperands( 1897 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1898{ 1899 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1900 1901 if (lhsType->isVectorType() || rhsType->isVectorType()) 1902 return CheckVectorOperands(loc, lex, rex); 1903 1904 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1905 1906 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1907 return compType; 1908 return InvalidOperands(loc, lex, rex); 1909} 1910 1911inline QualType Sema::CheckRemainderOperands( 1912 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1913{ 1914 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1915 1916 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1917 1918 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1919 return compType; 1920 return InvalidOperands(loc, lex, rex); 1921} 1922 1923inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1924 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1925{ 1926 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1927 return CheckVectorOperands(loc, lex, rex); 1928 1929 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1930 1931 // handle the common case first (both operands are arithmetic). 1932 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1933 return compType; 1934 1935 // Put any potential pointer into PExp 1936 Expr* PExp = lex, *IExp = rex; 1937 if (IExp->getType()->isPointerType()) 1938 std::swap(PExp, IExp); 1939 1940 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1941 if (IExp->getType()->isIntegerType()) { 1942 // Check for arithmetic on pointers to incomplete types 1943 if (!PTy->getPointeeType()->isObjectType()) { 1944 if (PTy->getPointeeType()->isVoidType()) { 1945 Diag(loc, diag::ext_gnu_void_ptr, 1946 lex->getSourceRange(), rex->getSourceRange()); 1947 } else { 1948 Diag(loc, diag::err_typecheck_arithmetic_incomplete_type, 1949 lex->getType().getAsString(), lex->getSourceRange()); 1950 return QualType(); 1951 } 1952 } 1953 return PExp->getType(); 1954 } 1955 } 1956 1957 return InvalidOperands(loc, lex, rex); 1958} 1959 1960// C99 6.5.6 1961QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1962 SourceLocation loc, bool isCompAssign) { 1963 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1964 return CheckVectorOperands(loc, lex, rex); 1965 1966 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1967 1968 // Enforce type constraints: C99 6.5.6p3. 1969 1970 // Handle the common case first (both operands are arithmetic). 1971 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1972 return compType; 1973 1974 // Either ptr - int or ptr - ptr. 1975 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1976 QualType lpointee = LHSPTy->getPointeeType(); 1977 1978 // The LHS must be an object type, not incomplete, function, etc. 1979 if (!lpointee->isObjectType()) { 1980 // Handle the GNU void* extension. 1981 if (lpointee->isVoidType()) { 1982 Diag(loc, diag::ext_gnu_void_ptr, 1983 lex->getSourceRange(), rex->getSourceRange()); 1984 } else { 1985 Diag(loc, diag::err_typecheck_sub_ptr_object, 1986 lex->getType().getAsString(), lex->getSourceRange()); 1987 return QualType(); 1988 } 1989 } 1990 1991 // The result type of a pointer-int computation is the pointer type. 1992 if (rex->getType()->isIntegerType()) 1993 return lex->getType(); 1994 1995 // Handle pointer-pointer subtractions. 1996 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 1997 QualType rpointee = RHSPTy->getPointeeType(); 1998 1999 // RHS must be an object type, unless void (GNU). 2000 if (!rpointee->isObjectType()) { 2001 // Handle the GNU void* extension. 2002 if (rpointee->isVoidType()) { 2003 if (!lpointee->isVoidType()) 2004 Diag(loc, diag::ext_gnu_void_ptr, 2005 lex->getSourceRange(), rex->getSourceRange()); 2006 } else { 2007 Diag(loc, diag::err_typecheck_sub_ptr_object, 2008 rex->getType().getAsString(), rex->getSourceRange()); 2009 return QualType(); 2010 } 2011 } 2012 2013 // Pointee types must be compatible. 2014 if (!Context.typesAreCompatible( 2015 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2016 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2017 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 2018 lex->getType().getAsString(), rex->getType().getAsString(), 2019 lex->getSourceRange(), rex->getSourceRange()); 2020 return QualType(); 2021 } 2022 2023 return Context.getPointerDiffType(); 2024 } 2025 } 2026 2027 return InvalidOperands(loc, lex, rex); 2028} 2029 2030// C99 6.5.7 2031QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 2032 bool isCompAssign) { 2033 // C99 6.5.7p2: Each of the operands shall have integer type. 2034 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2035 return InvalidOperands(loc, lex, rex); 2036 2037 // Shifts don't perform usual arithmetic conversions, they just do integer 2038 // promotions on each operand. C99 6.5.7p3 2039 if (!isCompAssign) 2040 UsualUnaryConversions(lex); 2041 UsualUnaryConversions(rex); 2042 2043 // "The type of the result is that of the promoted left operand." 2044 return lex->getType(); 2045} 2046 2047static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 2048 ASTContext& Context) { 2049 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2050 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2051 // ID acts sort of like void* for ObjC interfaces 2052 if (LHSIface && Context.isObjCIdType(RHS)) 2053 return true; 2054 if (RHSIface && Context.isObjCIdType(LHS)) 2055 return true; 2056 if (!LHSIface || !RHSIface) 2057 return false; 2058 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 2059 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 2060} 2061 2062// C99 6.5.8 2063QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 2064 bool isRelational) { 2065 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2066 return CheckVectorCompareOperands(lex, rex, loc, isRelational); 2067 2068 // C99 6.5.8p3 / C99 6.5.9p4 2069 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2070 UsualArithmeticConversions(lex, rex); 2071 else { 2072 UsualUnaryConversions(lex); 2073 UsualUnaryConversions(rex); 2074 } 2075 QualType lType = lex->getType(); 2076 QualType rType = rex->getType(); 2077 2078 // For non-floating point types, check for self-comparisons of the form 2079 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2080 // often indicate logic errors in the program. 2081 if (!lType->isFloatingType()) { 2082 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2083 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2084 if (DRL->getDecl() == DRR->getDecl()) 2085 Diag(loc, diag::warn_selfcomparison); 2086 } 2087 2088 if (isRelational) { 2089 if (lType->isRealType() && rType->isRealType()) 2090 return Context.IntTy; 2091 } else { 2092 // Check for comparisons of floating point operands using != and ==. 2093 if (lType->isFloatingType()) { 2094 assert (rType->isFloatingType()); 2095 CheckFloatComparison(loc,lex,rex); 2096 } 2097 2098 if (lType->isArithmeticType() && rType->isArithmeticType()) 2099 return Context.IntTy; 2100 } 2101 2102 bool LHSIsNull = lex->isNullPointerConstant(Context); 2103 bool RHSIsNull = rex->isNullPointerConstant(Context); 2104 2105 // All of the following pointer related warnings are GCC extensions, except 2106 // when handling null pointer constants. One day, we can consider making them 2107 // errors (when -pedantic-errors is enabled). 2108 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2109 QualType LCanPointeeTy = 2110 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2111 QualType RCanPointeeTy = 2112 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2113 2114 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2115 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2116 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2117 RCanPointeeTy.getUnqualifiedType()) && 2118 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2119 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2120 lType.getAsString(), rType.getAsString(), 2121 lex->getSourceRange(), rex->getSourceRange()); 2122 } 2123 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2124 return Context.IntTy; 2125 } 2126 // Handle block pointer types. 2127 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2128 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2129 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2130 2131 if (!LHSIsNull && !RHSIsNull && 2132 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2133 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2134 lType.getAsString(), rType.getAsString(), 2135 lex->getSourceRange(), rex->getSourceRange()); 2136 } 2137 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2138 return Context.IntTy; 2139 } 2140 // Allow block pointers to be compared with null pointer constants. 2141 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2142 (lType->isPointerType() && rType->isBlockPointerType())) { 2143 if (!LHSIsNull && !RHSIsNull) { 2144 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2145 lType.getAsString(), rType.getAsString(), 2146 lex->getSourceRange(), rex->getSourceRange()); 2147 } 2148 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2149 return Context.IntTy; 2150 } 2151 2152 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2153 if (lType->isPointerType() || rType->isPointerType()) { 2154 if (!Context.typesAreCompatible(lType, rType)) { 2155 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2156 lType.getAsString(), rType.getAsString(), 2157 lex->getSourceRange(), rex->getSourceRange()); 2158 ImpCastExprToType(rex, lType); 2159 return Context.IntTy; 2160 } 2161 ImpCastExprToType(rex, lType); 2162 return Context.IntTy; 2163 } 2164 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2165 ImpCastExprToType(rex, lType); 2166 return Context.IntTy; 2167 } else { 2168 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2169 Diag(loc, diag::warn_incompatible_qualified_id_operands, 2170 lType.getAsString(), rType.getAsString(), 2171 lex->getSourceRange(), rex->getSourceRange()); 2172 ImpCastExprToType(rex, lType); 2173 return Context.IntTy; 2174 } 2175 } 2176 } 2177 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2178 rType->isIntegerType()) { 2179 if (!RHSIsNull) 2180 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2181 lType.getAsString(), rType.getAsString(), 2182 lex->getSourceRange(), rex->getSourceRange()); 2183 ImpCastExprToType(rex, lType); // promote the integer to pointer 2184 return Context.IntTy; 2185 } 2186 if (lType->isIntegerType() && 2187 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2188 if (!LHSIsNull) 2189 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2190 lType.getAsString(), rType.getAsString(), 2191 lex->getSourceRange(), rex->getSourceRange()); 2192 ImpCastExprToType(lex, rType); // promote the integer to pointer 2193 return Context.IntTy; 2194 } 2195 // Handle block pointers. 2196 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2197 if (!RHSIsNull) 2198 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2199 lType.getAsString(), rType.getAsString(), 2200 lex->getSourceRange(), rex->getSourceRange()); 2201 ImpCastExprToType(rex, lType); // promote the integer to pointer 2202 return Context.IntTy; 2203 } 2204 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2205 if (!LHSIsNull) 2206 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2207 lType.getAsString(), rType.getAsString(), 2208 lex->getSourceRange(), rex->getSourceRange()); 2209 ImpCastExprToType(lex, rType); // promote the integer to pointer 2210 return Context.IntTy; 2211 } 2212 return InvalidOperands(loc, lex, rex); 2213} 2214 2215/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2216/// operates on extended vector types. Instead of producing an IntTy result, 2217/// like a scalar comparison, a vector comparison produces a vector of integer 2218/// types. 2219QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2220 SourceLocation loc, 2221 bool isRelational) { 2222 // Check to make sure we're operating on vectors of the same type and width, 2223 // Allowing one side to be a scalar of element type. 2224 QualType vType = CheckVectorOperands(loc, lex, rex); 2225 if (vType.isNull()) 2226 return vType; 2227 2228 QualType lType = lex->getType(); 2229 QualType rType = rex->getType(); 2230 2231 // For non-floating point types, check for self-comparisons of the form 2232 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2233 // often indicate logic errors in the program. 2234 if (!lType->isFloatingType()) { 2235 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2236 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2237 if (DRL->getDecl() == DRR->getDecl()) 2238 Diag(loc, diag::warn_selfcomparison); 2239 } 2240 2241 // Check for comparisons of floating point operands using != and ==. 2242 if (!isRelational && lType->isFloatingType()) { 2243 assert (rType->isFloatingType()); 2244 CheckFloatComparison(loc,lex,rex); 2245 } 2246 2247 // Return the type for the comparison, which is the same as vector type for 2248 // integer vectors, or an integer type of identical size and number of 2249 // elements for floating point vectors. 2250 if (lType->isIntegerType()) 2251 return lType; 2252 2253 const VectorType *VTy = lType->getAsVectorType(); 2254 2255 // FIXME: need to deal with non-32b int / non-64b long long 2256 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2257 if (TypeSize == 32) { 2258 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2259 } 2260 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2261 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2262} 2263 2264inline QualType Sema::CheckBitwiseOperands( 2265 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 2266{ 2267 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2268 return CheckVectorOperands(loc, lex, rex); 2269 2270 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2271 2272 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2273 return compType; 2274 return InvalidOperands(loc, lex, rex); 2275} 2276 2277inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2278 Expr *&lex, Expr *&rex, SourceLocation loc) 2279{ 2280 UsualUnaryConversions(lex); 2281 UsualUnaryConversions(rex); 2282 2283 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2284 return Context.IntTy; 2285 return InvalidOperands(loc, lex, rex); 2286} 2287 2288inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 2289 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 2290{ 2291 QualType lhsType = lex->getType(); 2292 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 2293 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(Context); 2294 2295 switch (mlval) { // C99 6.5.16p2 2296 case Expr::MLV_Valid: 2297 break; 2298 case Expr::MLV_ConstQualified: 2299 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 2300 return QualType(); 2301 case Expr::MLV_ArrayType: 2302 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 2303 lhsType.getAsString(), lex->getSourceRange()); 2304 return QualType(); 2305 case Expr::MLV_NotObjectType: 2306 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 2307 lhsType.getAsString(), lex->getSourceRange()); 2308 return QualType(); 2309 case Expr::MLV_InvalidExpression: 2310 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 2311 lex->getSourceRange()); 2312 return QualType(); 2313 case Expr::MLV_IncompleteType: 2314 case Expr::MLV_IncompleteVoidType: 2315 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 2316 lhsType.getAsString(), lex->getSourceRange()); 2317 return QualType(); 2318 case Expr::MLV_DuplicateVectorComponents: 2319 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 2320 lex->getSourceRange()); 2321 return QualType(); 2322 case Expr::MLV_NotBlockQualified: 2323 Diag(loc, diag::err_block_decl_ref_not_modifiable_lvalue, 2324 lex->getSourceRange()); 2325 return QualType(); 2326 } 2327 2328 AssignConvertType ConvTy; 2329 if (compoundType.isNull()) { 2330 // Simple assignment "x = y". 2331 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 2332 2333 // If the RHS is a unary plus or minus, check to see if they = and + are 2334 // right next to each other. If so, the user may have typo'd "x =+ 4" 2335 // instead of "x += 4". 2336 Expr *RHSCheck = rex; 2337 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2338 RHSCheck = ICE->getSubExpr(); 2339 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2340 if ((UO->getOpcode() == UnaryOperator::Plus || 2341 UO->getOpcode() == UnaryOperator::Minus) && 2342 loc.isFileID() && UO->getOperatorLoc().isFileID() && 2343 // Only if the two operators are exactly adjacent. 2344 loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2345 Diag(loc, diag::warn_not_compound_assign, 2346 UO->getOpcode() == UnaryOperator::Plus ? "+" : "-", 2347 SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc())); 2348 } 2349 } else { 2350 // Compound assignment "x += y" 2351 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 2352 } 2353 2354 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 2355 rex, "assigning")) 2356 return QualType(); 2357 2358 // C99 6.5.16p3: The type of an assignment expression is the type of the 2359 // left operand unless the left operand has qualified type, in which case 2360 // it is the unqualified version of the type of the left operand. 2361 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2362 // is converted to the type of the assignment expression (above). 2363 // C++ 5.17p1: the type of the assignment expression is that of its left 2364 // oprdu. 2365 return lhsType.getUnqualifiedType(); 2366} 2367 2368inline QualType Sema::CheckCommaOperands( // C99 6.5.17 2369 Expr *&lex, Expr *&rex, SourceLocation loc) { 2370 2371 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2372 DefaultFunctionArrayConversion(rex); 2373 return rex->getType(); 2374} 2375 2376/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2377/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2378QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 2379 QualType resType = op->getType(); 2380 assert(!resType.isNull() && "no type for increment/decrement expression"); 2381 2382 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2383 if (const PointerType *pt = resType->getAsPointerType()) { 2384 if (pt->getPointeeType()->isVoidType()) { 2385 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 2386 } else if (!pt->getPointeeType()->isObjectType()) { 2387 // C99 6.5.2.4p2, 6.5.6p2 2388 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 2389 resType.getAsString(), op->getSourceRange()); 2390 return QualType(); 2391 } 2392 } else if (!resType->isRealType()) { 2393 if (resType->isComplexType()) 2394 // C99 does not support ++/-- on complex types. 2395 Diag(OpLoc, diag::ext_integer_increment_complex, 2396 resType.getAsString(), op->getSourceRange()); 2397 else { 2398 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 2399 resType.getAsString(), op->getSourceRange()); 2400 return QualType(); 2401 } 2402 } 2403 // At this point, we know we have a real, complex or pointer type. 2404 // Now make sure the operand is a modifiable lvalue. 2405 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(Context); 2406 if (mlval != Expr::MLV_Valid) { 2407 // FIXME: emit a more precise diagnostic... 2408 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 2409 op->getSourceRange()); 2410 return QualType(); 2411 } 2412 return resType; 2413} 2414 2415/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2416/// This routine allows us to typecheck complex/recursive expressions 2417/// where the declaration is needed for type checking. We only need to 2418/// handle cases when the expression references a function designator 2419/// or is an lvalue. Here are some examples: 2420/// - &(x) => x 2421/// - &*****f => f for f a function designator. 2422/// - &s.xx => s 2423/// - &s.zz[1].yy -> s, if zz is an array 2424/// - *(x + 1) -> x, if x is an array 2425/// - &"123"[2] -> 0 2426/// - & __real__ x -> x 2427static NamedDecl *getPrimaryDecl(Expr *E) { 2428 switch (E->getStmtClass()) { 2429 case Stmt::DeclRefExprClass: 2430 return cast<DeclRefExpr>(E)->getDecl(); 2431 case Stmt::MemberExprClass: 2432 // Fields cannot be declared with a 'register' storage class. 2433 // &X->f is always ok, even if X is declared register. 2434 if (cast<MemberExpr>(E)->isArrow()) 2435 return 0; 2436 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2437 case Stmt::ArraySubscriptExprClass: { 2438 // &X[4] and &4[X] refers to X if X is not a pointer. 2439 2440 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2441 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 2442 if (!VD || VD->getType()->isPointerType()) 2443 return 0; 2444 else 2445 return VD; 2446 } 2447 case Stmt::UnaryOperatorClass: { 2448 UnaryOperator *UO = cast<UnaryOperator>(E); 2449 2450 switch(UO->getOpcode()) { 2451 case UnaryOperator::Deref: { 2452 // *(X + 1) refers to X if X is not a pointer. 2453 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 2454 ValueDecl *VD = dyn_cast<ValueDecl>(D); 2455 if (!VD || VD->getType()->isPointerType()) 2456 return 0; 2457 return VD; 2458 } 2459 return 0; 2460 } 2461 case UnaryOperator::Real: 2462 case UnaryOperator::Imag: 2463 case UnaryOperator::Extension: 2464 return getPrimaryDecl(UO->getSubExpr()); 2465 default: 2466 return 0; 2467 } 2468 } 2469 case Stmt::BinaryOperatorClass: { 2470 BinaryOperator *BO = cast<BinaryOperator>(E); 2471 2472 // Handle cases involving pointer arithmetic. The result of an 2473 // Assign or AddAssign is not an lvalue so they can be ignored. 2474 2475 // (x + n) or (n + x) => x 2476 if (BO->getOpcode() == BinaryOperator::Add) { 2477 if (BO->getLHS()->getType()->isPointerType()) { 2478 return getPrimaryDecl(BO->getLHS()); 2479 } else if (BO->getRHS()->getType()->isPointerType()) { 2480 return getPrimaryDecl(BO->getRHS()); 2481 } 2482 } 2483 2484 return 0; 2485 } 2486 case Stmt::ParenExprClass: 2487 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2488 case Stmt::ImplicitCastExprClass: 2489 // &X[4] when X is an array, has an implicit cast from array to pointer. 2490 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2491 default: 2492 return 0; 2493 } 2494} 2495 2496/// CheckAddressOfOperand - The operand of & must be either a function 2497/// designator or an lvalue designating an object. If it is an lvalue, the 2498/// object cannot be declared with storage class register or be a bit field. 2499/// Note: The usual conversions are *not* applied to the operand of the & 2500/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2501QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2502 if (getLangOptions().C99) { 2503 // Implement C99-only parts of addressof rules. 2504 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2505 if (uOp->getOpcode() == UnaryOperator::Deref) 2506 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2507 // (assuming the deref expression is valid). 2508 return uOp->getSubExpr()->getType(); 2509 } 2510 // Technically, there should be a check for array subscript 2511 // expressions here, but the result of one is always an lvalue anyway. 2512 } 2513 NamedDecl *dcl = getPrimaryDecl(op); 2514 Expr::isLvalueResult lval = op->isLvalue(Context); 2515 2516 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2517 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2518 // FIXME: emit more specific diag... 2519 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 2520 op->getSourceRange()); 2521 return QualType(); 2522 } 2523 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2524 if (MemExpr->getMemberDecl()->isBitField()) { 2525 Diag(OpLoc, diag::err_typecheck_address_of, 2526 std::string("bit-field"), op->getSourceRange()); 2527 return QualType(); 2528 } 2529 // Check for Apple extension for accessing vector components. 2530 } else if (isa<ArraySubscriptExpr>(op) && 2531 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2532 Diag(OpLoc, diag::err_typecheck_address_of, 2533 std::string("vector"), op->getSourceRange()); 2534 return QualType(); 2535 } else if (dcl) { // C99 6.5.3.2p1 2536 // We have an lvalue with a decl. Make sure the decl is not declared 2537 // with the register storage-class specifier. 2538 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2539 if (vd->getStorageClass() == VarDecl::Register) { 2540 Diag(OpLoc, diag::err_typecheck_address_of, 2541 std::string("register variable"), op->getSourceRange()); 2542 return QualType(); 2543 } 2544 } else 2545 assert(0 && "Unknown/unexpected decl type"); 2546 } 2547 2548 // If the operand has type "type", the result has type "pointer to type". 2549 return Context.getPointerType(op->getType()); 2550} 2551 2552QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 2553 UsualUnaryConversions(op); 2554 QualType qType = op->getType(); 2555 2556 if (const PointerType *PT = qType->getAsPointerType()) { 2557 // Note that per both C89 and C99, this is always legal, even 2558 // if ptype is an incomplete type or void. 2559 // It would be possible to warn about dereferencing a 2560 // void pointer, but it's completely well-defined, 2561 // and such a warning is unlikely to catch any mistakes. 2562 return PT->getPointeeType(); 2563 } 2564 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 2565 qType.getAsString(), op->getSourceRange()); 2566 return QualType(); 2567} 2568 2569static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2570 tok::TokenKind Kind) { 2571 BinaryOperator::Opcode Opc; 2572 switch (Kind) { 2573 default: assert(0 && "Unknown binop!"); 2574 case tok::star: Opc = BinaryOperator::Mul; break; 2575 case tok::slash: Opc = BinaryOperator::Div; break; 2576 case tok::percent: Opc = BinaryOperator::Rem; break; 2577 case tok::plus: Opc = BinaryOperator::Add; break; 2578 case tok::minus: Opc = BinaryOperator::Sub; break; 2579 case tok::lessless: Opc = BinaryOperator::Shl; break; 2580 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2581 case tok::lessequal: Opc = BinaryOperator::LE; break; 2582 case tok::less: Opc = BinaryOperator::LT; break; 2583 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2584 case tok::greater: Opc = BinaryOperator::GT; break; 2585 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2586 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2587 case tok::amp: Opc = BinaryOperator::And; break; 2588 case tok::caret: Opc = BinaryOperator::Xor; break; 2589 case tok::pipe: Opc = BinaryOperator::Or; break; 2590 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2591 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2592 case tok::equal: Opc = BinaryOperator::Assign; break; 2593 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2594 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2595 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2596 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2597 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2598 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2599 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2600 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2601 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2602 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2603 case tok::comma: Opc = BinaryOperator::Comma; break; 2604 } 2605 return Opc; 2606} 2607 2608static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2609 tok::TokenKind Kind) { 2610 UnaryOperator::Opcode Opc; 2611 switch (Kind) { 2612 default: assert(0 && "Unknown unary op!"); 2613 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2614 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2615 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2616 case tok::star: Opc = UnaryOperator::Deref; break; 2617 case tok::plus: Opc = UnaryOperator::Plus; break; 2618 case tok::minus: Opc = UnaryOperator::Minus; break; 2619 case tok::tilde: Opc = UnaryOperator::Not; break; 2620 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2621 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 2622 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 2623 case tok::kw___real: Opc = UnaryOperator::Real; break; 2624 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2625 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2626 } 2627 return Opc; 2628} 2629 2630/// CreateBuiltinBinOp - Creates a new built-in binary operation with 2631/// operator @p Opc at location @c TokLoc. This routine only supports 2632/// built-in operations; ActOnBinOp handles overloaded operators. 2633Action::ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 2634 unsigned Op, 2635 Expr *lhs, Expr *rhs) { 2636 QualType ResultTy; // Result type of the binary operator. 2637 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2638 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 2639 2640 switch (Opc) { 2641 default: 2642 assert(0 && "Unknown binary expr!"); 2643 case BinaryOperator::Assign: 2644 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 2645 break; 2646 case BinaryOperator::Mul: 2647 case BinaryOperator::Div: 2648 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 2649 break; 2650 case BinaryOperator::Rem: 2651 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 2652 break; 2653 case BinaryOperator::Add: 2654 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 2655 break; 2656 case BinaryOperator::Sub: 2657 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 2658 break; 2659 case BinaryOperator::Shl: 2660 case BinaryOperator::Shr: 2661 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 2662 break; 2663 case BinaryOperator::LE: 2664 case BinaryOperator::LT: 2665 case BinaryOperator::GE: 2666 case BinaryOperator::GT: 2667 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 2668 break; 2669 case BinaryOperator::EQ: 2670 case BinaryOperator::NE: 2671 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 2672 break; 2673 case BinaryOperator::And: 2674 case BinaryOperator::Xor: 2675 case BinaryOperator::Or: 2676 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 2677 break; 2678 case BinaryOperator::LAnd: 2679 case BinaryOperator::LOr: 2680 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 2681 break; 2682 case BinaryOperator::MulAssign: 2683 case BinaryOperator::DivAssign: 2684 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 2685 if (!CompTy.isNull()) 2686 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2687 break; 2688 case BinaryOperator::RemAssign: 2689 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 2690 if (!CompTy.isNull()) 2691 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2692 break; 2693 case BinaryOperator::AddAssign: 2694 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 2695 if (!CompTy.isNull()) 2696 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2697 break; 2698 case BinaryOperator::SubAssign: 2699 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 2700 if (!CompTy.isNull()) 2701 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2702 break; 2703 case BinaryOperator::ShlAssign: 2704 case BinaryOperator::ShrAssign: 2705 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 2706 if (!CompTy.isNull()) 2707 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2708 break; 2709 case BinaryOperator::AndAssign: 2710 case BinaryOperator::XorAssign: 2711 case BinaryOperator::OrAssign: 2712 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 2713 if (!CompTy.isNull()) 2714 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2715 break; 2716 case BinaryOperator::Comma: 2717 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 2718 break; 2719 } 2720 if (ResultTy.isNull()) 2721 return true; 2722 if (CompTy.isNull()) 2723 return new BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc); 2724 else 2725 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, OpLoc); 2726} 2727 2728// Binary Operators. 'Tok' is the token for the operator. 2729Action::ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 2730 tok::TokenKind Kind, 2731 ExprTy *LHS, ExprTy *RHS) { 2732 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 2733 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 2734 2735 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 2736 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 2737 2738 if (getLangOptions().CPlusPlus && 2739 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 2740 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 2741 // C++ [over.binary]p1: 2742 // A binary operator shall be implemented either by a non-static 2743 // member function (9.3) with one parameter or by a non-member 2744 // function with two parameters. Thus, for any binary operator 2745 // @, x@y can be interpreted as either x.operator@(y) or 2746 // operator@(x,y). If both forms of the operator function have 2747 // been declared, the rules in 13.3.1.2 determines which, if 2748 // any, interpretation is used. 2749 OverloadCandidateSet CandidateSet; 2750 2751 // Determine which overloaded operator we're dealing with. 2752 static const OverloadedOperatorKind OverOps[] = { 2753 OO_Star, OO_Slash, OO_Percent, 2754 OO_Plus, OO_Minus, 2755 OO_LessLess, OO_GreaterGreater, 2756 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 2757 OO_EqualEqual, OO_ExclaimEqual, 2758 OO_Amp, 2759 OO_Caret, 2760 OO_Pipe, 2761 OO_AmpAmp, 2762 OO_PipePipe, 2763 OO_Equal, OO_StarEqual, 2764 OO_SlashEqual, OO_PercentEqual, 2765 OO_PlusEqual, OO_MinusEqual, 2766 OO_LessLessEqual, OO_GreaterGreaterEqual, 2767 OO_AmpEqual, OO_CaretEqual, 2768 OO_PipeEqual, 2769 OO_Comma 2770 }; 2771 OverloadedOperatorKind OverOp = OverOps[Opc]; 2772 2773 // Lookup this operator. 2774 Decl *D = LookupDecl(&PP.getIdentifierTable().getOverloadedOperator(OverOp), 2775 Decl::IDNS_Ordinary, S); 2776 2777 // Add any overloaded operators we find to the overload set. 2778 Expr *Args[2] = { lhs, rhs }; 2779 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) 2780 AddOverloadCandidate(FD, Args, 2, CandidateSet); 2781 else if (OverloadedFunctionDecl *Ovl 2782 = dyn_cast_or_null<OverloadedFunctionDecl>(D)) 2783 AddOverloadCandidates(Ovl, Args, 2, CandidateSet); 2784 2785 // FIXME: Add builtin overload candidates (C++ [over.built]). 2786 2787 // Perform overload resolution. 2788 OverloadCandidateSet::iterator Best; 2789 switch (BestViableFunction(CandidateSet, Best)) { 2790 case OR_Success: { 2791 // FIXME: We might find a built-in candidate here. 2792 FunctionDecl *FnDecl = Best->Function; 2793 2794 // Convert the arguments. 2795 // FIXME: Conversion will be different for member operators. 2796 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 2797 "passing") || 2798 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 2799 "passing")) 2800 return true; 2801 2802 // Determine the result type 2803 QualType ResultTy 2804 = FnDecl->getType()->getAsFunctionType()->getResultType(); 2805 ResultTy = ResultTy.getNonReferenceType(); 2806 2807 // Build the actual expression node. 2808 // FIXME: We lose the fact that we have a function here! 2809 if (Opc > BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) 2810 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, ResultTy, 2811 TokLoc); 2812 else 2813 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 2814 } 2815 2816 case OR_No_Viable_Function: 2817 // No viable function; fall through to handling this as a 2818 // built-in operator. 2819 break; 2820 2821 case OR_Ambiguous: 2822 Diag(TokLoc, 2823 diag::err_ovl_ambiguous_oper, 2824 BinaryOperator::getOpcodeStr(Opc), 2825 lhs->getSourceRange(), rhs->getSourceRange()); 2826 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2827 return true; 2828 } 2829 2830 // There was no viable overloaded operator; fall through. 2831 } 2832 2833 2834 // Build a built-in binary operation. 2835 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 2836} 2837 2838// Unary Operators. 'Tok' is the token for the operator. 2839Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2840 ExprTy *input) { 2841 Expr *Input = (Expr*)input; 2842 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2843 QualType resultType; 2844 switch (Opc) { 2845 default: 2846 assert(0 && "Unimplemented unary expr!"); 2847 case UnaryOperator::PreInc: 2848 case UnaryOperator::PreDec: 2849 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2850 break; 2851 case UnaryOperator::AddrOf: 2852 resultType = CheckAddressOfOperand(Input, OpLoc); 2853 break; 2854 case UnaryOperator::Deref: 2855 DefaultFunctionArrayConversion(Input); 2856 resultType = CheckIndirectionOperand(Input, OpLoc); 2857 break; 2858 case UnaryOperator::Plus: 2859 case UnaryOperator::Minus: 2860 UsualUnaryConversions(Input); 2861 resultType = Input->getType(); 2862 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2863 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2864 resultType.getAsString()); 2865 break; 2866 case UnaryOperator::Not: // bitwise complement 2867 UsualUnaryConversions(Input); 2868 resultType = Input->getType(); 2869 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 2870 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 2871 // C99 does not support '~' for complex conjugation. 2872 Diag(OpLoc, diag::ext_integer_complement_complex, 2873 resultType.getAsString(), Input->getSourceRange()); 2874 else if (!resultType->isIntegerType()) 2875 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2876 resultType.getAsString(), Input->getSourceRange()); 2877 break; 2878 case UnaryOperator::LNot: // logical negation 2879 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2880 DefaultFunctionArrayConversion(Input); 2881 resultType = Input->getType(); 2882 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2883 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2884 resultType.getAsString()); 2885 // LNot always has type int. C99 6.5.3.3p5. 2886 resultType = Context.IntTy; 2887 break; 2888 case UnaryOperator::SizeOf: 2889 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2890 Input->getSourceRange(), true); 2891 break; 2892 case UnaryOperator::AlignOf: 2893 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2894 Input->getSourceRange(), false); 2895 break; 2896 case UnaryOperator::Real: 2897 case UnaryOperator::Imag: 2898 resultType = CheckRealImagOperand(Input, OpLoc); 2899 break; 2900 case UnaryOperator::Extension: 2901 resultType = Input->getType(); 2902 break; 2903 } 2904 if (resultType.isNull()) 2905 return true; 2906 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2907} 2908 2909/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2910Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2911 SourceLocation LabLoc, 2912 IdentifierInfo *LabelII) { 2913 // Look up the record for this label identifier. 2914 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2915 2916 // If we haven't seen this label yet, create a forward reference. It 2917 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 2918 if (LabelDecl == 0) 2919 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2920 2921 // Create the AST node. The address of a label always has type 'void*'. 2922 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2923 Context.getPointerType(Context.VoidTy)); 2924} 2925 2926Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2927 SourceLocation RPLoc) { // "({..})" 2928 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2929 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2930 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2931 2932 // FIXME: there are a variety of strange constraints to enforce here, for 2933 // example, it is not possible to goto into a stmt expression apparently. 2934 // More semantic analysis is needed. 2935 2936 // FIXME: the last statement in the compount stmt has its value used. We 2937 // should not warn about it being unused. 2938 2939 // If there are sub stmts in the compound stmt, take the type of the last one 2940 // as the type of the stmtexpr. 2941 QualType Ty = Context.VoidTy; 2942 2943 if (!Compound->body_empty()) { 2944 Stmt *LastStmt = Compound->body_back(); 2945 // If LastStmt is a label, skip down through into the body. 2946 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 2947 LastStmt = Label->getSubStmt(); 2948 2949 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 2950 Ty = LastExpr->getType(); 2951 } 2952 2953 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2954} 2955 2956Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2957 SourceLocation TypeLoc, 2958 TypeTy *argty, 2959 OffsetOfComponent *CompPtr, 2960 unsigned NumComponents, 2961 SourceLocation RPLoc) { 2962 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2963 assert(!ArgTy.isNull() && "Missing type argument!"); 2964 2965 // We must have at least one component that refers to the type, and the first 2966 // one is known to be a field designator. Verify that the ArgTy represents 2967 // a struct/union/class. 2968 if (!ArgTy->isRecordType()) 2969 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2970 2971 // Otherwise, create a compound literal expression as the base, and 2972 // iteratively process the offsetof designators. 2973 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2974 2975 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2976 // GCC extension, diagnose them. 2977 if (NumComponents != 1) 2978 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2979 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2980 2981 for (unsigned i = 0; i != NumComponents; ++i) { 2982 const OffsetOfComponent &OC = CompPtr[i]; 2983 if (OC.isBrackets) { 2984 // Offset of an array sub-field. TODO: Should we allow vector elements? 2985 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 2986 if (!AT) { 2987 delete Res; 2988 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 2989 Res->getType().getAsString()); 2990 } 2991 2992 // FIXME: C++: Verify that operator[] isn't overloaded. 2993 2994 // C99 6.5.2.1p1 2995 Expr *Idx = static_cast<Expr*>(OC.U.E); 2996 if (!Idx->getType()->isIntegerType()) 2997 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 2998 Idx->getSourceRange()); 2999 3000 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 3001 continue; 3002 } 3003 3004 const RecordType *RC = Res->getType()->getAsRecordType(); 3005 if (!RC) { 3006 delete Res; 3007 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 3008 Res->getType().getAsString()); 3009 } 3010 3011 // Get the decl corresponding to this. 3012 RecordDecl *RD = RC->getDecl(); 3013 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 3014 if (!MemberDecl) 3015 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 3016 OC.U.IdentInfo->getName(), 3017 SourceRange(OC.LocStart, OC.LocEnd)); 3018 3019 // FIXME: C++: Verify that MemberDecl isn't a static field. 3020 // FIXME: Verify that MemberDecl isn't a bitfield. 3021 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 3022 // matter here. 3023 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, 3024 MemberDecl->getType().getNonReferenceType()); 3025 } 3026 3027 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 3028 BuiltinLoc); 3029} 3030 3031 3032Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 3033 TypeTy *arg1, TypeTy *arg2, 3034 SourceLocation RPLoc) { 3035 QualType argT1 = QualType::getFromOpaquePtr(arg1); 3036 QualType argT2 = QualType::getFromOpaquePtr(arg2); 3037 3038 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 3039 3040 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 3041} 3042 3043Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 3044 ExprTy *expr1, ExprTy *expr2, 3045 SourceLocation RPLoc) { 3046 Expr *CondExpr = static_cast<Expr*>(cond); 3047 Expr *LHSExpr = static_cast<Expr*>(expr1); 3048 Expr *RHSExpr = static_cast<Expr*>(expr2); 3049 3050 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 3051 3052 // The conditional expression is required to be a constant expression. 3053 llvm::APSInt condEval(32); 3054 SourceLocation ExpLoc; 3055 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 3056 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 3057 CondExpr->getSourceRange()); 3058 3059 // If the condition is > zero, then the AST type is the same as the LSHExpr. 3060 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 3061 RHSExpr->getType(); 3062 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 3063} 3064 3065//===----------------------------------------------------------------------===// 3066// Clang Extensions. 3067//===----------------------------------------------------------------------===// 3068 3069/// ActOnBlockStart - This callback is invoked when a block literal is started. 3070void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 3071 // Analyze block parameters. 3072 BlockSemaInfo *BSI = new BlockSemaInfo(); 3073 3074 // Add BSI to CurBlock. 3075 BSI->PrevBlockInfo = CurBlock; 3076 CurBlock = BSI; 3077 3078 BSI->ReturnType = 0; 3079 BSI->TheScope = BlockScope; 3080 3081 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 3082 PushDeclContext(BSI->TheDecl); 3083} 3084 3085void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 3086 // Analyze arguments to block. 3087 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 3088 "Not a function declarator!"); 3089 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 3090 3091 CurBlock->hasPrototype = FTI.hasPrototype; 3092 CurBlock->isVariadic = true; 3093 3094 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 3095 // no arguments, not a function that takes a single void argument. 3096 if (FTI.hasPrototype && 3097 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3098 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 3099 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 3100 // empty arg list, don't push any params. 3101 CurBlock->isVariadic = false; 3102 } else if (FTI.hasPrototype) { 3103 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 3104 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 3105 CurBlock->isVariadic = FTI.isVariadic; 3106 } 3107 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 3108 3109 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 3110 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 3111 // If this has an identifier, add it to the scope stack. 3112 if ((*AI)->getIdentifier()) 3113 PushOnScopeChains(*AI, CurBlock->TheScope); 3114} 3115 3116/// ActOnBlockError - If there is an error parsing a block, this callback 3117/// is invoked to pop the information about the block from the action impl. 3118void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 3119 // Ensure that CurBlock is deleted. 3120 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 3121 3122 // Pop off CurBlock, handle nested blocks. 3123 CurBlock = CurBlock->PrevBlockInfo; 3124 3125 // FIXME: Delete the ParmVarDecl objects as well??? 3126 3127} 3128 3129/// ActOnBlockStmtExpr - This is called when the body of a block statement 3130/// literal was successfully completed. ^(int x){...} 3131Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 3132 Scope *CurScope) { 3133 // Ensure that CurBlock is deleted. 3134 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 3135 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 3136 3137 PopDeclContext(); 3138 3139 // Pop off CurBlock, handle nested blocks. 3140 CurBlock = CurBlock->PrevBlockInfo; 3141 3142 QualType RetTy = Context.VoidTy; 3143 if (BSI->ReturnType) 3144 RetTy = QualType(BSI->ReturnType, 0); 3145 3146 llvm::SmallVector<QualType, 8> ArgTypes; 3147 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 3148 ArgTypes.push_back(BSI->Params[i]->getType()); 3149 3150 QualType BlockTy; 3151 if (!BSI->hasPrototype) 3152 BlockTy = Context.getFunctionTypeNoProto(RetTy); 3153 else 3154 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 3155 BSI->isVariadic, 0); 3156 3157 BlockTy = Context.getBlockPointerType(BlockTy); 3158 3159 BSI->TheDecl->setBody(Body.take()); 3160 return new BlockExpr(BSI->TheDecl, BlockTy); 3161} 3162 3163/// ExprsMatchFnType - return true if the Exprs in array Args have 3164/// QualTypes that match the QualTypes of the arguments of the FnType. 3165/// The number of arguments has already been validated to match the number of 3166/// arguments in FnType. 3167static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 3168 ASTContext &Context) { 3169 unsigned NumParams = FnType->getNumArgs(); 3170 for (unsigned i = 0; i != NumParams; ++i) { 3171 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 3172 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 3173 3174 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 3175 return false; 3176 } 3177 return true; 3178} 3179 3180Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 3181 SourceLocation *CommaLocs, 3182 SourceLocation BuiltinLoc, 3183 SourceLocation RParenLoc) { 3184 // __builtin_overload requires at least 2 arguments 3185 if (NumArgs < 2) 3186 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3187 SourceRange(BuiltinLoc, RParenLoc)); 3188 3189 // The first argument is required to be a constant expression. It tells us 3190 // the number of arguments to pass to each of the functions to be overloaded. 3191 Expr **Args = reinterpret_cast<Expr**>(args); 3192 Expr *NParamsExpr = Args[0]; 3193 llvm::APSInt constEval(32); 3194 SourceLocation ExpLoc; 3195 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 3196 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3197 NParamsExpr->getSourceRange()); 3198 3199 // Verify that the number of parameters is > 0 3200 unsigned NumParams = constEval.getZExtValue(); 3201 if (NumParams == 0) 3202 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3203 NParamsExpr->getSourceRange()); 3204 // Verify that we have at least 1 + NumParams arguments to the builtin. 3205 if ((NumParams + 1) > NumArgs) 3206 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3207 SourceRange(BuiltinLoc, RParenLoc)); 3208 3209 // Figure out the return type, by matching the args to one of the functions 3210 // listed after the parameters. 3211 OverloadExpr *OE = 0; 3212 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 3213 // UsualUnaryConversions will convert the function DeclRefExpr into a 3214 // pointer to function. 3215 Expr *Fn = UsualUnaryConversions(Args[i]); 3216 const FunctionTypeProto *FnType = 0; 3217 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3218 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3219 3220 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3221 // parameters, and the number of parameters must match the value passed to 3222 // the builtin. 3223 if (!FnType || (FnType->getNumArgs() != NumParams)) 3224 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 3225 Fn->getSourceRange()); 3226 3227 // Scan the parameter list for the FunctionType, checking the QualType of 3228 // each parameter against the QualTypes of the arguments to the builtin. 3229 // If they match, return a new OverloadExpr. 3230 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3231 if (OE) 3232 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 3233 OE->getFn()->getSourceRange()); 3234 // Remember our match, and continue processing the remaining arguments 3235 // to catch any errors. 3236 OE = new OverloadExpr(Args, NumArgs, i, 3237 FnType->getResultType().getNonReferenceType(), 3238 BuiltinLoc, RParenLoc); 3239 } 3240 } 3241 // Return the newly created OverloadExpr node, if we succeded in matching 3242 // exactly one of the candidate functions. 3243 if (OE) 3244 return OE; 3245 3246 // If we didn't find a matching function Expr in the __builtin_overload list 3247 // the return an error. 3248 std::string typeNames; 3249 for (unsigned i = 0; i != NumParams; ++i) { 3250 if (i != 0) typeNames += ", "; 3251 typeNames += Args[i+1]->getType().getAsString(); 3252 } 3253 3254 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 3255 SourceRange(BuiltinLoc, RParenLoc)); 3256} 3257 3258Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3259 ExprTy *expr, TypeTy *type, 3260 SourceLocation RPLoc) { 3261 Expr *E = static_cast<Expr*>(expr); 3262 QualType T = QualType::getFromOpaquePtr(type); 3263 3264 InitBuiltinVaListType(); 3265 3266 // Get the va_list type 3267 QualType VaListType = Context.getBuiltinVaListType(); 3268 // Deal with implicit array decay; for example, on x86-64, 3269 // va_list is an array, but it's supposed to decay to 3270 // a pointer for va_arg. 3271 if (VaListType->isArrayType()) 3272 VaListType = Context.getArrayDecayedType(VaListType); 3273 // Make sure the input expression also decays appropriately. 3274 UsualUnaryConversions(E); 3275 3276 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3277 return Diag(E->getLocStart(), 3278 diag::err_first_argument_to_va_arg_not_of_type_va_list, 3279 E->getType().getAsString(), 3280 E->getSourceRange()); 3281 3282 // FIXME: Warn if a non-POD type is passed in. 3283 3284 return new VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 3285} 3286 3287bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3288 SourceLocation Loc, 3289 QualType DstType, QualType SrcType, 3290 Expr *SrcExpr, const char *Flavor) { 3291 // Decode the result (notice that AST's are still created for extensions). 3292 bool isInvalid = false; 3293 unsigned DiagKind; 3294 switch (ConvTy) { 3295 default: assert(0 && "Unknown conversion type"); 3296 case Compatible: return false; 3297 case PointerToInt: 3298 DiagKind = diag::ext_typecheck_convert_pointer_int; 3299 break; 3300 case IntToPointer: 3301 DiagKind = diag::ext_typecheck_convert_int_pointer; 3302 break; 3303 case IncompatiblePointer: 3304 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3305 break; 3306 case FunctionVoidPointer: 3307 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3308 break; 3309 case CompatiblePointerDiscardsQualifiers: 3310 // If the qualifiers lost were because we were applying the 3311 // (deprecated) C++ conversion from a string literal to a char* 3312 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3313 // Ideally, this check would be performed in 3314 // CheckPointerTypesForAssignment. However, that would require a 3315 // bit of refactoring (so that the second argument is an 3316 // expression, rather than a type), which should be done as part 3317 // of a larger effort to fix CheckPointerTypesForAssignment for 3318 // C++ semantics. 3319 if (getLangOptions().CPlusPlus && 3320 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3321 return false; 3322 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3323 break; 3324 case IntToBlockPointer: 3325 DiagKind = diag::err_int_to_block_pointer; 3326 break; 3327 case IncompatibleBlockPointer: 3328 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3329 break; 3330 case BlockVoidPointer: 3331 DiagKind = diag::ext_typecheck_convert_pointer_void_block; 3332 break; 3333 case IncompatibleObjCQualifiedId: 3334 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3335 // it can give a more specific diagnostic. 3336 DiagKind = diag::warn_incompatible_qualified_id; 3337 break; 3338 case Incompatible: 3339 DiagKind = diag::err_typecheck_convert_incompatible; 3340 isInvalid = true; 3341 break; 3342 } 3343 3344 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 3345 SrcExpr->getSourceRange()); 3346 return isInvalid; 3347} 3348