SemaExpr.cpp revision cc785c8a2eb6899cb84d049de7d938e54f920a9e
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" 24using namespace clang; 25 26//===----------------------------------------------------------------------===// 27// Standard Promotions and Conversions 28//===----------------------------------------------------------------------===// 29 30/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 31void Sema::DefaultFunctionArrayConversion(Expr *&E) { 32 QualType Ty = E->getType(); 33 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 34 35 if (const ReferenceType *ref = Ty->getAsReferenceType()) { 36 ImpCastExprToType(E, ref->getPointeeType()); // C++ [expr] 37 Ty = E->getType(); 38 } 39 if (Ty->isFunctionType()) 40 ImpCastExprToType(E, Context.getPointerType(Ty)); 41 else if (Ty->isArrayType()) { 42 // In C90 mode, arrays only promote to pointers if the array expression is 43 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 44 // type 'array of type' is converted to an expression that has type 'pointer 45 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 46 // that has type 'array of type' ...". The relevant change is "an lvalue" 47 // (C90) to "an expression" (C99). 48 if (getLangOptions().C99 || E->isLvalue(Context) == Expr::LV_Valid) 49 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 50 } 51} 52 53/// UsualUnaryConversions - Performs various conversions that are common to most 54/// operators (C99 6.3). The conversions of array and function types are 55/// sometimes surpressed. For example, the array->pointer conversion doesn't 56/// apply if the array is an argument to the sizeof or address (&) operators. 57/// In these instances, this routine should *not* be called. 58Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 59 QualType Ty = Expr->getType(); 60 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 61 62 if (const ReferenceType *Ref = Ty->getAsReferenceType()) { 63 ImpCastExprToType(Expr, Ref->getPointeeType()); // C++ [expr] 64 Ty = Expr->getType(); 65 } 66 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 67 ImpCastExprToType(Expr, Context.IntTy); 68 else 69 DefaultFunctionArrayConversion(Expr); 70 71 return Expr; 72} 73 74/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 75/// do not have a prototype. Arguments that have type float are promoted to 76/// double. All other argument types are converted by UsualUnaryConversions(). 77void Sema::DefaultArgumentPromotion(Expr *&Expr) { 78 QualType Ty = Expr->getType(); 79 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 80 81 // If this is a 'float' (CVR qualified or typedef) promote to double. 82 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 83 if (BT->getKind() == BuiltinType::Float) 84 return ImpCastExprToType(Expr, Context.DoubleTy); 85 86 UsualUnaryConversions(Expr); 87} 88 89/// UsualArithmeticConversions - Performs various conversions that are common to 90/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 91/// routine returns the first non-arithmetic type found. The client is 92/// responsible for emitting appropriate error diagnostics. 93/// FIXME: verify the conversion rules for "complex int" are consistent with 94/// GCC. 95QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 96 bool isCompAssign) { 97 if (!isCompAssign) { 98 UsualUnaryConversions(lhsExpr); 99 UsualUnaryConversions(rhsExpr); 100 } 101 // For conversion purposes, we ignore any qualifiers. 102 // For example, "const float" and "float" are equivalent. 103 QualType lhs = 104 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 105 QualType rhs = 106 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 107 108 // If both types are identical, no conversion is needed. 109 if (lhs == rhs) 110 return lhs; 111 112 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 113 // The caller can deal with this (e.g. pointer + int). 114 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 115 return lhs; 116 117 // At this point, we have two different arithmetic types. 118 119 // Handle complex types first (C99 6.3.1.8p1). 120 if (lhs->isComplexType() || rhs->isComplexType()) { 121 // if we have an integer operand, the result is the complex type. 122 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 123 // convert the rhs to the lhs complex type. 124 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 125 return lhs; 126 } 127 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 128 // convert the lhs to the rhs complex type. 129 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 130 return rhs; 131 } 132 // This handles complex/complex, complex/float, or float/complex. 133 // When both operands are complex, the shorter operand is converted to the 134 // type of the longer, and that is the type of the result. This corresponds 135 // to what is done when combining two real floating-point operands. 136 // The fun begins when size promotion occur across type domains. 137 // From H&S 6.3.4: When one operand is complex and the other is a real 138 // floating-point type, the less precise type is converted, within it's 139 // real or complex domain, to the precision of the other type. For example, 140 // when combining a "long double" with a "double _Complex", the 141 // "double _Complex" is promoted to "long double _Complex". 142 int result = Context.getFloatingTypeOrder(lhs, rhs); 143 144 if (result > 0) { // The left side is bigger, convert rhs. 145 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 146 if (!isCompAssign) 147 ImpCastExprToType(rhsExpr, rhs); 148 } else if (result < 0) { // The right side is bigger, convert lhs. 149 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 150 if (!isCompAssign) 151 ImpCastExprToType(lhsExpr, lhs); 152 } 153 // At this point, lhs and rhs have the same rank/size. Now, make sure the 154 // domains match. This is a requirement for our implementation, C99 155 // does not require this promotion. 156 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 157 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 158 if (!isCompAssign) 159 ImpCastExprToType(lhsExpr, rhs); 160 return rhs; 161 } else { // handle "_Complex double, double". 162 if (!isCompAssign) 163 ImpCastExprToType(rhsExpr, lhs); 164 return lhs; 165 } 166 } 167 return lhs; // The domain/size match exactly. 168 } 169 // Now handle "real" floating types (i.e. float, double, long double). 170 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 171 // if we have an integer operand, the result is the real floating type. 172 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 173 // convert rhs to the lhs floating point type. 174 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 175 return lhs; 176 } 177 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 178 // convert lhs to the rhs floating point type. 179 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 180 return rhs; 181 } 182 // We have two real floating types, float/complex combos were handled above. 183 // Convert the smaller operand to the bigger result. 184 int result = Context.getFloatingTypeOrder(lhs, rhs); 185 186 if (result > 0) { // convert the rhs 187 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 188 return lhs; 189 } 190 if (result < 0) { // convert the lhs 191 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 192 return rhs; 193 } 194 assert(0 && "Sema::UsualArithmeticConversions(): illegal float comparison"); 195 } 196 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 197 // Handle GCC complex int extension. 198 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 199 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 200 201 if (lhsComplexInt && rhsComplexInt) { 202 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 203 rhsComplexInt->getElementType()) >= 0) { 204 // convert the rhs 205 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 206 return lhs; 207 } 208 if (!isCompAssign) 209 ImpCastExprToType(lhsExpr, rhs); // convert the lhs 210 return rhs; 211 } else if (lhsComplexInt && rhs->isIntegerType()) { 212 // convert the rhs to the lhs complex type. 213 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 214 return lhs; 215 } else if (rhsComplexInt && lhs->isIntegerType()) { 216 // convert the lhs to the rhs complex type. 217 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 218 return rhs; 219 } 220 } 221 // Finally, we have two differing integer types. 222 // The rules for this case are in C99 6.3.1.8 223 int compare = Context.getIntegerTypeOrder(lhs, rhs); 224 bool lhsSigned = lhs->isSignedIntegerType(), 225 rhsSigned = rhs->isSignedIntegerType(); 226 QualType destType; 227 if (lhsSigned == rhsSigned) { 228 // Same signedness; use the higher-ranked type 229 destType = compare >= 0 ? lhs : rhs; 230 } else if (compare != (lhsSigned ? 1 : -1)) { 231 // The unsigned type has greater than or equal rank to the 232 // signed type, so use the unsigned type 233 destType = lhsSigned ? rhs : lhs; 234 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 235 // The two types are different widths; if we are here, that 236 // means the signed type is larger than the unsigned type, so 237 // use the signed type. 238 destType = lhsSigned ? lhs : rhs; 239 } else { 240 // The signed type is higher-ranked than the unsigned type, 241 // but isn't actually any bigger (like unsigned int and long 242 // on most 32-bit systems). Use the unsigned type corresponding 243 // to the signed type. 244 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 245 } 246 if (!isCompAssign) { 247 ImpCastExprToType(lhsExpr, destType); 248 ImpCastExprToType(rhsExpr, destType); 249 } 250 return destType; 251} 252 253//===----------------------------------------------------------------------===// 254// Semantic Analysis for various Expression Types 255//===----------------------------------------------------------------------===// 256 257 258/// ActOnStringLiteral - The specified tokens were lexed as pasted string 259/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 260/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 261/// multiple tokens. However, the common case is that StringToks points to one 262/// string. 263/// 264Action::ExprResult 265Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 266 assert(NumStringToks && "Must have at least one string!"); 267 268 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 269 if (Literal.hadError) 270 return ExprResult(true); 271 272 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 273 for (unsigned i = 0; i != NumStringToks; ++i) 274 StringTokLocs.push_back(StringToks[i].getLocation()); 275 276 // Verify that pascal strings aren't too large. 277 if (Literal.Pascal && Literal.GetStringLength() > 256) 278 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long, 279 SourceRange(StringToks[0].getLocation(), 280 StringToks[NumStringToks-1].getLocation())); 281 282 QualType StrTy = Context.CharTy; 283 if (Literal.AnyWide) StrTy = Context.getWCharType(); 284 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 285 286 // Get an array type for the string, according to C99 6.4.5. This includes 287 // the nul terminator character as well as the string length for pascal 288 // strings. 289 StrTy = Context.getConstantArrayType(StrTy, 290 llvm::APInt(32, Literal.GetStringLength()+1), 291 ArrayType::Normal, 0); 292 293 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 294 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 295 Literal.AnyWide, StrTy, 296 StringToks[0].getLocation(), 297 StringToks[NumStringToks-1].getLocation()); 298} 299 300 301/// ActOnIdentifierExpr - The parser read an identifier in expression context, 302/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 303/// identifier is used in a function call context. 304Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 305 IdentifierInfo &II, 306 bool HasTrailingLParen) { 307 // Could be enum-constant, value decl, instance variable, etc. 308 Decl *D = LookupDecl(&II, Decl::IDNS_Ordinary, S); 309 310 // If this reference is in an Objective-C method, then ivar lookup happens as 311 // well. 312 if (getCurMethodDecl()) { 313 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 314 // There are two cases to handle here. 1) scoped lookup could have failed, 315 // in which case we should look for an ivar. 2) scoped lookup could have 316 // found a decl, but that decl is outside the current method (i.e. a global 317 // variable). In these two cases, we do a lookup for an ivar with this 318 // name, if the lookup suceeds, we replace it our current decl. 319 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 320 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 321 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&II)) { 322 // FIXME: This should use a new expr for a direct reference, don't turn 323 // this into Self->ivar, just return a BareIVarExpr or something. 324 IdentifierInfo &II = Context.Idents.get("self"); 325 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 326 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 327 static_cast<Expr*>(SelfExpr.Val), true, true); 328 } 329 } 330 // Needed to implement property "super.method" notation. 331 if (SD == 0 && &II == SuperID) { 332 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 333 getCurMethodDecl()->getClassInterface())); 334 return new PredefinedExpr(Loc, T, PredefinedExpr::ObjCSuper); 335 } 336 } 337 338 if (D == 0) { 339 // Otherwise, this could be an implicitly declared function reference (legal 340 // in C90, extension in C99). 341 if (HasTrailingLParen && 342 !getLangOptions().CPlusPlus) // Not in C++. 343 D = ImplicitlyDefineFunction(Loc, II, S); 344 else { 345 // If this name wasn't predeclared and if this is not a function call, 346 // diagnose the problem. 347 return Diag(Loc, diag::err_undeclared_var_use, II.getName()); 348 } 349 } 350 351 if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 352 // check if referencing an identifier with __attribute__((deprecated)). 353 if (VD->getAttr<DeprecatedAttr>()) 354 Diag(Loc, diag::warn_deprecated, VD->getName()); 355 356 // Only create DeclRefExpr's for valid Decl's. 357 if (VD->isInvalidDecl()) 358 return true; 359 return new DeclRefExpr(VD, VD->getType(), Loc); 360 } 361 362 if (CXXFieldDecl *FD = dyn_cast<CXXFieldDecl>(D)) { 363 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 364 if (MD->isStatic()) 365 // "invalid use of member 'x' in static member function" 366 return Diag(Loc, diag::err_invalid_member_use_in_static_method, 367 FD->getName()); 368 if (cast<CXXRecordDecl>(MD->getParent()) != FD->getParent()) 369 // "invalid use of nonstatic data member 'x'" 370 return Diag(Loc, diag::err_invalid_non_static_member_use, 371 FD->getName()); 372 373 if (FD->isInvalidDecl()) 374 return true; 375 376 // FIXME: Use DeclRefExpr or a new Expr for a direct CXXField reference. 377 ExprResult ThisExpr = ActOnCXXThis(SourceLocation()); 378 return new MemberExpr(static_cast<Expr*>(ThisExpr.Val), 379 true, FD, Loc, FD->getType()); 380 } 381 382 return Diag(Loc, diag::err_invalid_non_static_member_use, FD->getName()); 383 } 384 385 if (isa<TypedefDecl>(D)) 386 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 387 if (isa<ObjCInterfaceDecl>(D)) 388 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 389 if (isa<NamespaceDecl>(D)) 390 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 391 392 assert(0 && "Invalid decl"); 393 abort(); 394} 395 396Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 397 tok::TokenKind Kind) { 398 PredefinedExpr::IdentType IT; 399 400 switch (Kind) { 401 default: assert(0 && "Unknown simple primary expr!"); 402 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 403 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 404 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 405 } 406 407 // Verify that this is in a function context. 408 if (getCurFunctionDecl() == 0 && getCurMethodDecl() == 0) 409 return Diag(Loc, diag::err_predef_outside_function); 410 411 // Pre-defined identifiers are of type char[x], where x is the length of the 412 // string. 413 unsigned Length; 414 if (getCurFunctionDecl()) 415 Length = getCurFunctionDecl()->getIdentifier()->getLength(); 416 else 417 Length = getCurMethodDecl()->getSynthesizedMethodSize(); 418 419 llvm::APInt LengthI(32, Length + 1); 420 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 421 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 422 return new PredefinedExpr(Loc, ResTy, IT); 423} 424 425Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 426 llvm::SmallString<16> CharBuffer; 427 CharBuffer.resize(Tok.getLength()); 428 const char *ThisTokBegin = &CharBuffer[0]; 429 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 430 431 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 432 Tok.getLocation(), PP); 433 if (Literal.hadError()) 434 return ExprResult(true); 435 436 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 437 438 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 439 Tok.getLocation()); 440} 441 442Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 443 // fast path for a single digit (which is quite common). A single digit 444 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 445 if (Tok.getLength() == 1) { 446 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 447 448 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 449 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 450 Context.IntTy, 451 Tok.getLocation())); 452 } 453 llvm::SmallString<512> IntegerBuffer; 454 IntegerBuffer.resize(Tok.getLength()); 455 const char *ThisTokBegin = &IntegerBuffer[0]; 456 457 // Get the spelling of the token, which eliminates trigraphs, etc. 458 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 459 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 460 Tok.getLocation(), PP); 461 if (Literal.hadError) 462 return ExprResult(true); 463 464 Expr *Res; 465 466 if (Literal.isFloatingLiteral()) { 467 QualType Ty; 468 if (Literal.isFloat) 469 Ty = Context.FloatTy; 470 else if (!Literal.isLong) 471 Ty = Context.DoubleTy; 472 else 473 Ty = Context.LongDoubleTy; 474 475 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 476 477 // isExact will be set by GetFloatValue(). 478 bool isExact = false; 479 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 480 Ty, Tok.getLocation()); 481 482 } else if (!Literal.isIntegerLiteral()) { 483 return ExprResult(true); 484 } else { 485 QualType Ty; 486 487 // long long is a C99 feature. 488 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 489 Literal.isLongLong) 490 Diag(Tok.getLocation(), diag::ext_longlong); 491 492 // Get the value in the widest-possible width. 493 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 494 495 if (Literal.GetIntegerValue(ResultVal)) { 496 // If this value didn't fit into uintmax_t, warn and force to ull. 497 Diag(Tok.getLocation(), diag::warn_integer_too_large); 498 Ty = Context.UnsignedLongLongTy; 499 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 500 "long long is not intmax_t?"); 501 } else { 502 // If this value fits into a ULL, try to figure out what else it fits into 503 // according to the rules of C99 6.4.4.1p5. 504 505 // Octal, Hexadecimal, and integers with a U suffix are allowed to 506 // be an unsigned int. 507 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 508 509 // Check from smallest to largest, picking the smallest type we can. 510 unsigned Width = 0; 511 if (!Literal.isLong && !Literal.isLongLong) { 512 // Are int/unsigned possibilities? 513 unsigned IntSize = Context.Target.getIntWidth(); 514 515 // Does it fit in a unsigned int? 516 if (ResultVal.isIntN(IntSize)) { 517 // Does it fit in a signed int? 518 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 519 Ty = Context.IntTy; 520 else if (AllowUnsigned) 521 Ty = Context.UnsignedIntTy; 522 Width = IntSize; 523 } 524 } 525 526 // Are long/unsigned long possibilities? 527 if (Ty.isNull() && !Literal.isLongLong) { 528 unsigned LongSize = Context.Target.getLongWidth(); 529 530 // Does it fit in a unsigned long? 531 if (ResultVal.isIntN(LongSize)) { 532 // Does it fit in a signed long? 533 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 534 Ty = Context.LongTy; 535 else if (AllowUnsigned) 536 Ty = Context.UnsignedLongTy; 537 Width = LongSize; 538 } 539 } 540 541 // Finally, check long long if needed. 542 if (Ty.isNull()) { 543 unsigned LongLongSize = Context.Target.getLongLongWidth(); 544 545 // Does it fit in a unsigned long long? 546 if (ResultVal.isIntN(LongLongSize)) { 547 // Does it fit in a signed long long? 548 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 549 Ty = Context.LongLongTy; 550 else if (AllowUnsigned) 551 Ty = Context.UnsignedLongLongTy; 552 Width = LongLongSize; 553 } 554 } 555 556 // If we still couldn't decide a type, we probably have something that 557 // does not fit in a signed long long, but has no U suffix. 558 if (Ty.isNull()) { 559 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 560 Ty = Context.UnsignedLongLongTy; 561 Width = Context.Target.getLongLongWidth(); 562 } 563 564 if (ResultVal.getBitWidth() != Width) 565 ResultVal.trunc(Width); 566 } 567 568 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 569 } 570 571 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 572 if (Literal.isImaginary) 573 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 574 575 return Res; 576} 577 578Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 579 ExprTy *Val) { 580 Expr *E = (Expr *)Val; 581 assert((E != 0) && "ActOnParenExpr() missing expr"); 582 return new ParenExpr(L, R, E); 583} 584 585/// The UsualUnaryConversions() function is *not* called by this routine. 586/// See C99 6.3.2.1p[2-4] for more details. 587QualType Sema::CheckSizeOfAlignOfOperand(QualType exprType, 588 SourceLocation OpLoc, 589 const SourceRange &ExprRange, 590 bool isSizeof) { 591 // C99 6.5.3.4p1: 592 if (isa<FunctionType>(exprType) && isSizeof) 593 // alignof(function) is allowed. 594 Diag(OpLoc, diag::ext_sizeof_function_type, ExprRange); 595 else if (exprType->isVoidType()) 596 Diag(OpLoc, diag::ext_sizeof_void_type, isSizeof ? "sizeof" : "__alignof", 597 ExprRange); 598 else if (exprType->isIncompleteType()) { 599 Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 600 diag::err_alignof_incomplete_type, 601 exprType.getAsString(), ExprRange); 602 return QualType(); // error 603 } 604 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 605 return Context.getSizeType(); 606} 607 608Action::ExprResult Sema:: 609ActOnSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, 610 SourceLocation LPLoc, TypeTy *Ty, 611 SourceLocation RPLoc) { 612 // If error parsing type, ignore. 613 if (Ty == 0) return true; 614 615 // Verify that this is a valid expression. 616 QualType ArgTy = QualType::getFromOpaquePtr(Ty); 617 618 QualType resultType = 619 CheckSizeOfAlignOfOperand(ArgTy, OpLoc, SourceRange(LPLoc, RPLoc),isSizeof); 620 621 if (resultType.isNull()) 622 return true; 623 return new SizeOfAlignOfTypeExpr(isSizeof, ArgTy, resultType, OpLoc, RPLoc); 624} 625 626QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 627 DefaultFunctionArrayConversion(V); 628 629 // These operators return the element type of a complex type. 630 if (const ComplexType *CT = V->getType()->getAsComplexType()) 631 return CT->getElementType(); 632 633 // Otherwise they pass through real integer and floating point types here. 634 if (V->getType()->isArithmeticType()) 635 return V->getType(); 636 637 // Reject anything else. 638 Diag(Loc, diag::err_realimag_invalid_type, V->getType().getAsString()); 639 return QualType(); 640} 641 642 643 644Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 645 tok::TokenKind Kind, 646 ExprTy *Input) { 647 UnaryOperator::Opcode Opc; 648 switch (Kind) { 649 default: assert(0 && "Unknown unary op!"); 650 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 651 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 652 } 653 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 654 if (result.isNull()) 655 return true; 656 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 657} 658 659Action::ExprResult Sema:: 660ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 661 ExprTy *Idx, SourceLocation RLoc) { 662 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 663 664 // Perform default conversions. 665 DefaultFunctionArrayConversion(LHSExp); 666 DefaultFunctionArrayConversion(RHSExp); 667 668 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 669 670 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 671 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 672 // in the subscript position. As a result, we need to derive the array base 673 // and index from the expression types. 674 Expr *BaseExpr, *IndexExpr; 675 QualType ResultType; 676 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 677 BaseExpr = LHSExp; 678 IndexExpr = RHSExp; 679 // FIXME: need to deal with const... 680 ResultType = PTy->getPointeeType(); 681 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 682 // Handle the uncommon case of "123[Ptr]". 683 BaseExpr = RHSExp; 684 IndexExpr = LHSExp; 685 // FIXME: need to deal with const... 686 ResultType = PTy->getPointeeType(); 687 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 688 BaseExpr = LHSExp; // vectors: V[123] 689 IndexExpr = RHSExp; 690 691 // Component access limited to variables (reject vec4.rg[1]). 692 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 693 !isa<ExtVectorElementExpr>(BaseExpr)) 694 return Diag(LLoc, diag::err_ext_vector_component_access, 695 SourceRange(LLoc, RLoc)); 696 // FIXME: need to deal with const... 697 ResultType = VTy->getElementType(); 698 } else { 699 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value, 700 RHSExp->getSourceRange()); 701 } 702 // C99 6.5.2.1p1 703 if (!IndexExpr->getType()->isIntegerType()) 704 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript, 705 IndexExpr->getSourceRange()); 706 707 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 708 // the following check catches trying to index a pointer to a function (e.g. 709 // void (*)(int)) and pointers to incomplete types. Functions are not 710 // objects in C99. 711 if (!ResultType->isObjectType()) 712 return Diag(BaseExpr->getLocStart(), 713 diag::err_typecheck_subscript_not_object, 714 BaseExpr->getType().getAsString(), BaseExpr->getSourceRange()); 715 716 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 717} 718 719QualType Sema:: 720CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 721 IdentifierInfo &CompName, SourceLocation CompLoc) { 722 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 723 724 // This flag determines whether or not the component is to be treated as a 725 // special name, or a regular GLSL-style component access. 726 bool SpecialComponent = false; 727 728 // The vector accessor can't exceed the number of elements. 729 const char *compStr = CompName.getName(); 730 if (strlen(compStr) > vecType->getNumElements()) { 731 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 732 baseType.getAsString(), SourceRange(CompLoc)); 733 return QualType(); 734 } 735 736 // Check that we've found one of the special components, or that the component 737 // names must come from the same set. 738 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 739 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 740 SpecialComponent = true; 741 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 742 do 743 compStr++; 744 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 745 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 746 do 747 compStr++; 748 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 749 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 750 do 751 compStr++; 752 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 753 } 754 755 if (!SpecialComponent && *compStr) { 756 // We didn't get to the end of the string. This means the component names 757 // didn't come from the same set *or* we encountered an illegal name. 758 Diag(OpLoc, diag::err_ext_vector_component_name_illegal, 759 std::string(compStr,compStr+1), SourceRange(CompLoc)); 760 return QualType(); 761 } 762 // Each component accessor can't exceed the vector type. 763 compStr = CompName.getName(); 764 while (*compStr) { 765 if (vecType->isAccessorWithinNumElements(*compStr)) 766 compStr++; 767 else 768 break; 769 } 770 if (!SpecialComponent && *compStr) { 771 // We didn't get to the end of the string. This means a component accessor 772 // exceeds the number of elements in the vector. 773 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 774 baseType.getAsString(), SourceRange(CompLoc)); 775 return QualType(); 776 } 777 778 // If we have a special component name, verify that the current vector length 779 // is an even number, since all special component names return exactly half 780 // the elements. 781 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 782 return QualType(); 783 } 784 785 // The component accessor looks fine - now we need to compute the actual type. 786 // The vector type is implied by the component accessor. For example, 787 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 788 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 789 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 790 : strlen(CompName.getName()); 791 if (CompSize == 1) 792 return vecType->getElementType(); 793 794 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 795 // Now look up the TypeDefDecl from the vector type. Without this, 796 // diagostics look bad. We want extended vector types to appear built-in. 797 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 798 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 799 return Context.getTypedefType(ExtVectorDecls[i]); 800 } 801 return VT; // should never get here (a typedef type should always be found). 802} 803 804/// constructSetterName - Return the setter name for the given 805/// identifier, i.e. "set" + Name where the initial character of Name 806/// has been capitalized. 807// FIXME: Merge with same routine in Parser. But where should this 808// live? 809static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 810 const IdentifierInfo *Name) { 811 unsigned N = Name->getLength(); 812 char *SelectorName = new char[3 + N]; 813 memcpy(SelectorName, "set", 3); 814 memcpy(&SelectorName[3], Name->getName(), N); 815 SelectorName[3] = toupper(SelectorName[3]); 816 817 IdentifierInfo *Setter = 818 &Idents.get(SelectorName, &SelectorName[3 + N]); 819 delete[] SelectorName; 820 return Setter; 821} 822 823Action::ExprResult Sema:: 824ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 825 tok::TokenKind OpKind, SourceLocation MemberLoc, 826 IdentifierInfo &Member) { 827 Expr *BaseExpr = static_cast<Expr *>(Base); 828 assert(BaseExpr && "no record expression"); 829 830 // Perform default conversions. 831 DefaultFunctionArrayConversion(BaseExpr); 832 833 QualType BaseType = BaseExpr->getType(); 834 assert(!BaseType.isNull() && "no type for member expression"); 835 836 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 837 // must have pointer type, and the accessed type is the pointee. 838 if (OpKind == tok::arrow) { 839 if (const PointerType *PT = BaseType->getAsPointerType()) 840 BaseType = PT->getPointeeType(); 841 else 842 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow, 843 BaseType.getAsString(), BaseExpr->getSourceRange()); 844 } 845 846 // Handle field access to simple records. This also handles access to fields 847 // of the ObjC 'id' struct. 848 if (const RecordType *RTy = BaseType->getAsRecordType()) { 849 RecordDecl *RDecl = RTy->getDecl(); 850 if (RTy->isIncompleteType()) 851 return Diag(OpLoc, diag::err_typecheck_incomplete_tag, RDecl->getName(), 852 BaseExpr->getSourceRange()); 853 // The record definition is complete, now make sure the member is valid. 854 FieldDecl *MemberDecl = RDecl->getMember(&Member); 855 if (!MemberDecl) 856 return Diag(MemberLoc, diag::err_typecheck_no_member, Member.getName(), 857 BaseExpr->getSourceRange()); 858 859 // Figure out the type of the member; see C99 6.5.2.3p3 860 // FIXME: Handle address space modifiers 861 QualType MemberType = MemberDecl->getType(); 862 unsigned combinedQualifiers = 863 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 864 MemberType = MemberType.getQualifiedType(combinedQualifiers); 865 866 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 867 MemberLoc, MemberType); 868 } 869 870 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 871 // (*Obj).ivar. 872 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 873 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) 874 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 875 OpKind == tok::arrow); 876 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar, 877 IFTy->getDecl()->getName(), Member.getName(), 878 BaseExpr->getSourceRange()); 879 } 880 881 // Handle Objective-C property access, which is "Obj.property" where Obj is a 882 // pointer to a (potentially qualified) interface type. 883 const PointerType *PTy; 884 const ObjCInterfaceType *IFTy; 885 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 886 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 887 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 888 889 // Search for a declared property first. 890 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 891 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 892 893 // Check protocols on qualified interfaces. 894 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 895 E = IFTy->qual_end(); I != E; ++I) 896 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 897 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 898 899 // If that failed, look for an "implicit" property by seeing if the nullary 900 // selector is implemented. 901 902 // FIXME: The logic for looking up nullary and unary selectors should be 903 // shared with the code in ActOnInstanceMessage. 904 905 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 906 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 907 908 // If this reference is in an @implementation, check for 'private' methods. 909 if (!Getter) 910 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 911 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 912 if (ObjCImplementationDecl *ImpDecl = 913 ObjCImplementations[ClassDecl->getIdentifier()]) 914 Getter = ImpDecl->getInstanceMethod(Sel); 915 916 if (Getter) { 917 // If we found a getter then this may be a valid dot-reference, we 918 // need to also look for the matching setter. 919 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 920 &Member); 921 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 922 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 923 924 if (!Setter) { 925 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 926 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 927 if (ObjCImplementationDecl *ImpDecl = 928 ObjCImplementations[ClassDecl->getIdentifier()]) 929 Setter = ImpDecl->getInstanceMethod(SetterSel); 930 } 931 932 // FIXME: There are some issues here. First, we are not 933 // diagnosing accesses to read-only properties because we do not 934 // know if this is a getter or setter yet. Second, we are 935 // checking that the type of the setter matches the type we 936 // expect. 937 return new ObjCPropertyRefExpr(Getter, Setter, Getter->getResultType(), 938 MemberLoc, BaseExpr); 939 } 940 } 941 942 // Handle 'field access' to vectors, such as 'V.xx'. 943 if (BaseType->isExtVectorType() && OpKind == tok::period) { 944 // Component access limited to variables (reject vec4.rg.g). 945 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 946 !isa<ExtVectorElementExpr>(BaseExpr)) 947 return Diag(MemberLoc, diag::err_ext_vector_component_access, 948 BaseExpr->getSourceRange()); 949 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 950 if (ret.isNull()) 951 return true; 952 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 953 } 954 955 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union, 956 BaseType.getAsString(), BaseExpr->getSourceRange()); 957} 958 959/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 960/// This provides the location of the left/right parens and a list of comma 961/// locations. 962Action::ExprResult Sema:: 963ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 964 ExprTy **args, unsigned NumArgs, 965 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 966 Expr *Fn = static_cast<Expr *>(fn); 967 Expr **Args = reinterpret_cast<Expr**>(args); 968 assert(Fn && "no function call expression"); 969 FunctionDecl *FDecl = NULL; 970 971 // Promote the function operand. 972 UsualUnaryConversions(Fn); 973 974 // If we're directly calling a function, get the declaration for 975 // that function. 976 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 977 if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr())) 978 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 979 980 // Make the call expr early, before semantic checks. This guarantees cleanup 981 // of arguments and function on error. 982 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 983 Context.BoolTy, RParenLoc)); 984 985 // C99 6.5.2.2p1 - "The expression that denotes the called function shall have 986 // type pointer to function". 987 const PointerType *PT = Fn->getType()->getAsPointerType(); 988 if (PT == 0) 989 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 990 Fn->getSourceRange()); 991 const FunctionType *FuncT = PT->getPointeeType()->getAsFunctionType(); 992 if (FuncT == 0) 993 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 994 Fn->getSourceRange()); 995 996 // We know the result type of the call, set it. 997 TheCall->setType(FuncT->getResultType()); 998 999 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1000 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1001 // assignment, to the types of the corresponding parameter, ... 1002 unsigned NumArgsInProto = Proto->getNumArgs(); 1003 unsigned NumArgsToCheck = NumArgs; 1004 1005 // If too few arguments are available (and we don't have default 1006 // arguments for the remaining parameters), don't make the call. 1007 if (NumArgs < NumArgsInProto) { 1008 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 1009 // Use default arguments for missing arguments 1010 NumArgsToCheck = NumArgsInProto; 1011 TheCall->setNumArgs(NumArgsInProto); 1012 } else 1013 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 1014 Fn->getSourceRange()); 1015 } 1016 1017 // If too many are passed and not variadic, error on the extras and drop 1018 // them. 1019 if (NumArgs > NumArgsInProto) { 1020 if (!Proto->isVariadic()) { 1021 Diag(Args[NumArgsInProto]->getLocStart(), 1022 diag::err_typecheck_call_too_many_args, Fn->getSourceRange(), 1023 SourceRange(Args[NumArgsInProto]->getLocStart(), 1024 Args[NumArgs-1]->getLocEnd())); 1025 // This deletes the extra arguments. 1026 TheCall->setNumArgs(NumArgsInProto); 1027 } 1028 NumArgsToCheck = NumArgsInProto; 1029 } 1030 1031 // Continue to check argument types (even if we have too few/many args). 1032 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1033 QualType ProtoArgType = Proto->getArgType(i); 1034 1035 Expr *Arg; 1036 if (i < NumArgs) 1037 Arg = Args[i]; 1038 else 1039 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1040 QualType ArgType = Arg->getType(); 1041 1042 // Compute implicit casts from the operand to the formal argument type. 1043 AssignConvertType ConvTy = 1044 CheckSingleAssignmentConstraints(ProtoArgType, Arg); 1045 TheCall->setArg(i, Arg); 1046 1047 if (DiagnoseAssignmentResult(ConvTy, Arg->getLocStart(), ProtoArgType, 1048 ArgType, Arg, "passing")) 1049 return true; 1050 } 1051 1052 // If this is a variadic call, handle args passed through "...". 1053 if (Proto->isVariadic()) { 1054 // Promote the arguments (C99 6.5.2.2p7). 1055 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1056 Expr *Arg = Args[i]; 1057 DefaultArgumentPromotion(Arg); 1058 TheCall->setArg(i, Arg); 1059 } 1060 } 1061 } else { 1062 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1063 1064 // Promote the arguments (C99 6.5.2.2p6). 1065 for (unsigned i = 0; i != NumArgs; i++) { 1066 Expr *Arg = Args[i]; 1067 DefaultArgumentPromotion(Arg); 1068 TheCall->setArg(i, Arg); 1069 } 1070 } 1071 1072 // Do special checking on direct calls to functions. 1073 if (FDecl) 1074 return CheckFunctionCall(FDecl, TheCall.take()); 1075 1076 return TheCall.take(); 1077} 1078 1079Action::ExprResult Sema:: 1080ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1081 SourceLocation RParenLoc, ExprTy *InitExpr) { 1082 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1083 QualType literalType = QualType::getFromOpaquePtr(Ty); 1084 // FIXME: put back this assert when initializers are worked out. 1085 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1086 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1087 1088 if (literalType->isArrayType()) { 1089 if (literalType->isVariableArrayType()) 1090 return Diag(LParenLoc, 1091 diag::err_variable_object_no_init, 1092 SourceRange(LParenLoc, 1093 literalExpr->getSourceRange().getEnd())); 1094 } else if (literalType->isIncompleteType()) { 1095 return Diag(LParenLoc, 1096 diag::err_typecheck_decl_incomplete_type, 1097 literalType.getAsString(), 1098 SourceRange(LParenLoc, 1099 literalExpr->getSourceRange().getEnd())); 1100 } 1101 1102 if (CheckInitializerTypes(literalExpr, literalType)) 1103 return true; 1104 1105 bool isFileScope = !getCurFunctionDecl() && !getCurMethodDecl(); 1106 if (isFileScope) { // 6.5.2.5p3 1107 if (CheckForConstantInitializer(literalExpr, literalType)) 1108 return true; 1109 } 1110 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, isFileScope); 1111} 1112 1113Action::ExprResult Sema:: 1114ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1115 SourceLocation RBraceLoc) { 1116 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1117 1118 // Semantic analysis for initializers is done by ActOnDeclarator() and 1119 // CheckInitializer() - it requires knowledge of the object being intialized. 1120 1121 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc); 1122 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1123 return E; 1124} 1125 1126/// CheckCastTypes - Check type constraints for casting between types. 1127bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1128 UsualUnaryConversions(castExpr); 1129 1130 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1131 // type needs to be scalar. 1132 if (castType->isVoidType()) { 1133 // Cast to void allows any expr type. 1134 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1135 // GCC struct/union extension: allow cast to self. 1136 if (Context.getCanonicalType(castType) != 1137 Context.getCanonicalType(castExpr->getType()) || 1138 (!castType->isStructureType() && !castType->isUnionType())) { 1139 // Reject any other conversions to non-scalar types. 1140 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar, 1141 castType.getAsString(), castExpr->getSourceRange()); 1142 } 1143 1144 // accept this, but emit an ext-warn. 1145 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar, 1146 castType.getAsString(), castExpr->getSourceRange()); 1147 } else if (!castExpr->getType()->isScalarType() && 1148 !castExpr->getType()->isVectorType()) { 1149 return Diag(castExpr->getLocStart(), 1150 diag::err_typecheck_expect_scalar_operand, 1151 castExpr->getType().getAsString(),castExpr->getSourceRange()); 1152 } else if (castExpr->getType()->isVectorType()) { 1153 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1154 return true; 1155 } else if (castType->isVectorType()) { 1156 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1157 return true; 1158 } 1159 return false; 1160} 1161 1162bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1163 assert(VectorTy->isVectorType() && "Not a vector type!"); 1164 1165 if (Ty->isVectorType() || Ty->isIntegerType()) { 1166 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1167 return Diag(R.getBegin(), 1168 Ty->isVectorType() ? 1169 diag::err_invalid_conversion_between_vectors : 1170 diag::err_invalid_conversion_between_vector_and_integer, 1171 VectorTy.getAsString().c_str(), 1172 Ty.getAsString().c_str(), R); 1173 } else 1174 return Diag(R.getBegin(), 1175 diag::err_invalid_conversion_between_vector_and_scalar, 1176 VectorTy.getAsString().c_str(), 1177 Ty.getAsString().c_str(), R); 1178 1179 return false; 1180} 1181 1182Action::ExprResult Sema:: 1183ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1184 SourceLocation RParenLoc, ExprTy *Op) { 1185 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1186 1187 Expr *castExpr = static_cast<Expr*>(Op); 1188 QualType castType = QualType::getFromOpaquePtr(Ty); 1189 1190 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1191 return true; 1192 return new ExplicitCastExpr(castType, castExpr, LParenLoc); 1193} 1194 1195/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1196/// In that case, lex = cond. 1197inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1198 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1199 UsualUnaryConversions(cond); 1200 UsualUnaryConversions(lex); 1201 UsualUnaryConversions(rex); 1202 QualType condT = cond->getType(); 1203 QualType lexT = lex->getType(); 1204 QualType rexT = rex->getType(); 1205 1206 // first, check the condition. 1207 if (!condT->isScalarType()) { // C99 6.5.15p2 1208 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 1209 condT.getAsString()); 1210 return QualType(); 1211 } 1212 1213 // Now check the two expressions. 1214 1215 // If both operands have arithmetic type, do the usual arithmetic conversions 1216 // to find a common type: C99 6.5.15p3,5. 1217 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1218 UsualArithmeticConversions(lex, rex); 1219 return lex->getType(); 1220 } 1221 1222 // If both operands are the same structure or union type, the result is that 1223 // type. 1224 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1225 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1226 if (LHSRT->getDecl() == RHSRT->getDecl()) 1227 // "If both the operands have structure or union type, the result has 1228 // that type." This implies that CV qualifiers are dropped. 1229 return lexT.getUnqualifiedType(); 1230 } 1231 1232 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1233 // The following || allows only one side to be void (a GCC-ism). 1234 if (lexT->isVoidType() || rexT->isVoidType()) { 1235 if (!lexT->isVoidType()) 1236 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 1237 rex->getSourceRange()); 1238 if (!rexT->isVoidType()) 1239 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 1240 lex->getSourceRange()); 1241 ImpCastExprToType(lex, Context.VoidTy); 1242 ImpCastExprToType(rex, Context.VoidTy); 1243 return Context.VoidTy; 1244 } 1245 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1246 // the type of the other operand." 1247 if (lexT->isPointerType() && rex->isNullPointerConstant(Context)) { 1248 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1249 return lexT; 1250 } 1251 if (rexT->isPointerType() && lex->isNullPointerConstant(Context)) { 1252 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1253 return rexT; 1254 } 1255 // Allow any Objective-C types to devolve to id type. 1256 // FIXME: This seems to match gcc behavior, although that is very 1257 // arguably incorrect. For example, (xxx ? (id<P>) : (id<P>)) has 1258 // type id, which seems broken. 1259 if (Context.isObjCObjectPointerType(lexT) && 1260 Context.isObjCObjectPointerType(rexT)) { 1261 // FIXME: This is not the correct composite type. This only 1262 // happens to work because id can more or less be used anywhere, 1263 // however this may change the type of method sends. 1264 // FIXME: gcc adds some type-checking of the arguments and emits 1265 // (confusing) incompatible comparison warnings in some 1266 // cases. Investigate. 1267 QualType compositeType = Context.getObjCIdType(); 1268 ImpCastExprToType(lex, compositeType); 1269 ImpCastExprToType(rex, compositeType); 1270 return compositeType; 1271 } 1272 // Handle the case where both operands are pointers before we handle null 1273 // pointer constants in case both operands are null pointer constants. 1274 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1275 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1276 // get the "pointed to" types 1277 QualType lhptee = LHSPT->getPointeeType(); 1278 QualType rhptee = RHSPT->getPointeeType(); 1279 1280 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1281 if (lhptee->isVoidType() && 1282 rhptee->isIncompleteOrObjectType()) { 1283 // Figure out necessary qualifiers (C99 6.5.15p6) 1284 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1285 QualType destType = Context.getPointerType(destPointee); 1286 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1287 ImpCastExprToType(rex, destType); // promote to void* 1288 return destType; 1289 } 1290 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1291 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1292 QualType destType = Context.getPointerType(destPointee); 1293 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1294 ImpCastExprToType(rex, destType); // promote to void* 1295 return destType; 1296 } 1297 1298 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1299 rhptee.getUnqualifiedType())) { 1300 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 1301 lexT.getAsString(), rexT.getAsString(), 1302 lex->getSourceRange(), rex->getSourceRange()); 1303 // In this situation, assume a conservative type; in general 1304 // we assume void* type. No especially good reason, but this 1305 // is what gcc does, and we do have to pick to get a 1306 // consistent AST. However, if either type is an Objective-C 1307 // object type then use id. 1308 QualType incompatTy; 1309 if (Context.isObjCObjectPointerType(lexT) || 1310 Context.isObjCObjectPointerType(rexT)) { 1311 incompatTy = Context.getObjCIdType(); 1312 } else { 1313 incompatTy = Context.getPointerType(Context.VoidTy); 1314 } 1315 ImpCastExprToType(lex, incompatTy); 1316 ImpCastExprToType(rex, incompatTy); 1317 return incompatTy; 1318 } 1319 // The pointer types are compatible. 1320 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1321 // differently qualified versions of compatible types, the result type is 1322 // a pointer to an appropriately qualified version of the *composite* 1323 // type. 1324 // FIXME: Need to calculate the composite type. 1325 // FIXME: Need to add qualifiers 1326 QualType compositeType = lexT; 1327 ImpCastExprToType(lex, compositeType); 1328 ImpCastExprToType(rex, compositeType); 1329 return compositeType; 1330 } 1331 } 1332 // Otherwise, the operands are not compatible. 1333 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 1334 lexT.getAsString(), rexT.getAsString(), 1335 lex->getSourceRange(), rex->getSourceRange()); 1336 return QualType(); 1337} 1338 1339/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1340/// in the case of a the GNU conditional expr extension. 1341Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1342 SourceLocation ColonLoc, 1343 ExprTy *Cond, ExprTy *LHS, 1344 ExprTy *RHS) { 1345 Expr *CondExpr = (Expr *) Cond; 1346 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1347 1348 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1349 // was the condition. 1350 bool isLHSNull = LHSExpr == 0; 1351 if (isLHSNull) 1352 LHSExpr = CondExpr; 1353 1354 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1355 RHSExpr, QuestionLoc); 1356 if (result.isNull()) 1357 return true; 1358 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1359 RHSExpr, result); 1360} 1361 1362 1363// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1364// being closely modeled after the C99 spec:-). The odd characteristic of this 1365// routine is it effectively iqnores the qualifiers on the top level pointee. 1366// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1367// FIXME: add a couple examples in this comment. 1368Sema::AssignConvertType 1369Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1370 QualType lhptee, rhptee; 1371 1372 // get the "pointed to" type (ignoring qualifiers at the top level) 1373 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1374 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1375 1376 // make sure we operate on the canonical type 1377 lhptee = Context.getCanonicalType(lhptee); 1378 rhptee = Context.getCanonicalType(rhptee); 1379 1380 AssignConvertType ConvTy = Compatible; 1381 1382 // C99 6.5.16.1p1: This following citation is common to constraints 1383 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1384 // qualifiers of the type *pointed to* by the right; 1385 // FIXME: Handle ASQualType 1386 if ((lhptee.getCVRQualifiers() & rhptee.getCVRQualifiers()) != 1387 rhptee.getCVRQualifiers()) 1388 ConvTy = CompatiblePointerDiscardsQualifiers; 1389 1390 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1391 // incomplete type and the other is a pointer to a qualified or unqualified 1392 // version of void... 1393 if (lhptee->isVoidType()) { 1394 if (rhptee->isIncompleteOrObjectType()) 1395 return ConvTy; 1396 1397 // As an extension, we allow cast to/from void* to function pointer. 1398 assert(rhptee->isFunctionType()); 1399 return FunctionVoidPointer; 1400 } 1401 1402 if (rhptee->isVoidType()) { 1403 if (lhptee->isIncompleteOrObjectType()) 1404 return ConvTy; 1405 1406 // As an extension, we allow cast to/from void* to function pointer. 1407 assert(lhptee->isFunctionType()); 1408 return FunctionVoidPointer; 1409 } 1410 1411 // Check for ObjC interfaces 1412 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1413 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1414 if (LHSIface && RHSIface && 1415 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1416 return ConvTy; 1417 1418 // ID acts sort of like void* for ObjC interfaces 1419 if (LHSIface && Context.isObjCIdType(rhptee)) 1420 return ConvTy; 1421 if (RHSIface && Context.isObjCIdType(lhptee)) 1422 return ConvTy; 1423 1424 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1425 // unqualified versions of compatible types, ... 1426 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1427 rhptee.getUnqualifiedType())) 1428 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1429 return ConvTy; 1430} 1431 1432/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1433/// has code to accommodate several GCC extensions when type checking 1434/// pointers. Here are some objectionable examples that GCC considers warnings: 1435/// 1436/// int a, *pint; 1437/// short *pshort; 1438/// struct foo *pfoo; 1439/// 1440/// pint = pshort; // warning: assignment from incompatible pointer type 1441/// a = pint; // warning: assignment makes integer from pointer without a cast 1442/// pint = a; // warning: assignment makes pointer from integer without a cast 1443/// pint = pfoo; // warning: assignment from incompatible pointer type 1444/// 1445/// As a result, the code for dealing with pointers is more complex than the 1446/// C99 spec dictates. 1447/// 1448Sema::AssignConvertType 1449Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1450 // Get canonical types. We're not formatting these types, just comparing 1451 // them. 1452 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1453 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1454 1455 if (lhsType == rhsType) 1456 return Compatible; // Common case: fast path an exact match. 1457 1458 if (lhsType->isReferenceType() || rhsType->isReferenceType()) { 1459 if (Context.typesAreCompatible(lhsType, rhsType)) 1460 return Compatible; 1461 return Incompatible; 1462 } 1463 1464 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1465 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1466 return Compatible; 1467 // Relax integer conversions like we do for pointers below. 1468 if (rhsType->isIntegerType()) 1469 return IntToPointer; 1470 if (lhsType->isIntegerType()) 1471 return PointerToInt; 1472 return Incompatible; 1473 } 1474 1475 if (lhsType->isVectorType() || rhsType->isVectorType()) { 1476 // For ExtVector, allow vector splats; float -> <n x float> 1477 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 1478 if (LV->getElementType() == rhsType) 1479 return Compatible; 1480 1481 // If we are allowing lax vector conversions, and LHS and RHS are both 1482 // vectors, the total size only needs to be the same. This is a bitcast; 1483 // no bits are changed but the result type is different. 1484 if (getLangOptions().LaxVectorConversions && 1485 lhsType->isVectorType() && rhsType->isVectorType()) { 1486 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1487 return Compatible; 1488 } 1489 return Incompatible; 1490 } 1491 1492 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1493 return Compatible; 1494 1495 if (isa<PointerType>(lhsType)) { 1496 if (rhsType->isIntegerType()) 1497 return IntToPointer; 1498 1499 if (isa<PointerType>(rhsType)) 1500 return CheckPointerTypesForAssignment(lhsType, rhsType); 1501 return Incompatible; 1502 } 1503 1504 if (isa<PointerType>(rhsType)) { 1505 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1506 if (lhsType == Context.BoolTy) 1507 return Compatible; 1508 1509 if (lhsType->isIntegerType()) 1510 return PointerToInt; 1511 1512 if (isa<PointerType>(lhsType)) 1513 return CheckPointerTypesForAssignment(lhsType, rhsType); 1514 return Incompatible; 1515 } 1516 1517 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1518 if (Context.typesAreCompatible(lhsType, rhsType)) 1519 return Compatible; 1520 } 1521 return Incompatible; 1522} 1523 1524Sema::AssignConvertType 1525Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1526 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1527 // a null pointer constant. 1528 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType()) 1529 && rExpr->isNullPointerConstant(Context)) { 1530 ImpCastExprToType(rExpr, lhsType); 1531 return Compatible; 1532 } 1533 // This check seems unnatural, however it is necessary to ensure the proper 1534 // conversion of functions/arrays. If the conversion were done for all 1535 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1536 // expressions that surpress this implicit conversion (&, sizeof). 1537 // 1538 // Suppress this for references: C99 8.5.3p5. FIXME: revisit when references 1539 // are better understood. 1540 if (!lhsType->isReferenceType()) 1541 DefaultFunctionArrayConversion(rExpr); 1542 1543 Sema::AssignConvertType result = 1544 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1545 1546 // C99 6.5.16.1p2: The value of the right operand is converted to the 1547 // type of the assignment expression. 1548 if (rExpr->getType() != lhsType) 1549 ImpCastExprToType(rExpr, lhsType); 1550 return result; 1551} 1552 1553Sema::AssignConvertType 1554Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1555 return CheckAssignmentConstraints(lhsType, rhsType); 1556} 1557 1558QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1559 Diag(loc, diag::err_typecheck_invalid_operands, 1560 lex->getType().getAsString(), rex->getType().getAsString(), 1561 lex->getSourceRange(), rex->getSourceRange()); 1562 return QualType(); 1563} 1564 1565inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1566 Expr *&rex) { 1567 // For conversion purposes, we ignore any qualifiers. 1568 // For example, "const float" and "float" are equivalent. 1569 QualType lhsType = 1570 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 1571 QualType rhsType = 1572 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 1573 1574 // If the vector types are identical, return. 1575 if (lhsType == rhsType) 1576 return lhsType; 1577 1578 // Handle the case of a vector & extvector type of the same size and element 1579 // type. It would be nice if we only had one vector type someday. 1580 if (getLangOptions().LaxVectorConversions) 1581 if (const VectorType *LV = lhsType->getAsVectorType()) 1582 if (const VectorType *RV = rhsType->getAsVectorType()) 1583 if (LV->getElementType() == RV->getElementType() && 1584 LV->getNumElements() == RV->getNumElements()) 1585 return lhsType->isExtVectorType() ? lhsType : rhsType; 1586 1587 // If the lhs is an extended vector and the rhs is a scalar of the same type 1588 // or a literal, promote the rhs to the vector type. 1589 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1590 QualType eltType = V->getElementType(); 1591 1592 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 1593 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 1594 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 1595 ImpCastExprToType(rex, lhsType); 1596 return lhsType; 1597 } 1598 } 1599 1600 // If the rhs is an extended vector and the lhs is a scalar of the same type, 1601 // promote the lhs to the vector type. 1602 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1603 QualType eltType = V->getElementType(); 1604 1605 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 1606 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 1607 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 1608 ImpCastExprToType(lex, rhsType); 1609 return rhsType; 1610 } 1611 } 1612 1613 // You cannot convert between vector values of different size. 1614 Diag(loc, diag::err_typecheck_vector_not_convertable, 1615 lex->getType().getAsString(), rex->getType().getAsString(), 1616 lex->getSourceRange(), rex->getSourceRange()); 1617 return QualType(); 1618} 1619 1620inline QualType Sema::CheckMultiplyDivideOperands( 1621 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1622{ 1623 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1624 1625 if (lhsType->isVectorType() || rhsType->isVectorType()) 1626 return CheckVectorOperands(loc, lex, rex); 1627 1628 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1629 1630 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1631 return compType; 1632 return InvalidOperands(loc, lex, rex); 1633} 1634 1635inline QualType Sema::CheckRemainderOperands( 1636 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1637{ 1638 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1639 1640 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1641 1642 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1643 return compType; 1644 return InvalidOperands(loc, lex, rex); 1645} 1646 1647inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1648 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1649{ 1650 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1651 return CheckVectorOperands(loc, lex, rex); 1652 1653 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1654 1655 // handle the common case first (both operands are arithmetic). 1656 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1657 return compType; 1658 1659 // Put any potential pointer into PExp 1660 Expr* PExp = lex, *IExp = rex; 1661 if (IExp->getType()->isPointerType()) 1662 std::swap(PExp, IExp); 1663 1664 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1665 if (IExp->getType()->isIntegerType()) { 1666 // Check for arithmetic on pointers to incomplete types 1667 if (!PTy->getPointeeType()->isObjectType()) { 1668 if (PTy->getPointeeType()->isVoidType()) { 1669 Diag(loc, diag::ext_gnu_void_ptr, 1670 lex->getSourceRange(), rex->getSourceRange()); 1671 } else { 1672 Diag(loc, diag::err_typecheck_arithmetic_incomplete_type, 1673 lex->getType().getAsString(), lex->getSourceRange()); 1674 return QualType(); 1675 } 1676 } 1677 return PExp->getType(); 1678 } 1679 } 1680 1681 return InvalidOperands(loc, lex, rex); 1682} 1683 1684// C99 6.5.6 1685QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1686 SourceLocation loc, bool isCompAssign) { 1687 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1688 return CheckVectorOperands(loc, lex, rex); 1689 1690 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1691 1692 // Enforce type constraints: C99 6.5.6p3. 1693 1694 // Handle the common case first (both operands are arithmetic). 1695 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1696 return compType; 1697 1698 // Either ptr - int or ptr - ptr. 1699 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1700 QualType lpointee = LHSPTy->getPointeeType(); 1701 1702 // The LHS must be an object type, not incomplete, function, etc. 1703 if (!lpointee->isObjectType()) { 1704 // Handle the GNU void* extension. 1705 if (lpointee->isVoidType()) { 1706 Diag(loc, diag::ext_gnu_void_ptr, 1707 lex->getSourceRange(), rex->getSourceRange()); 1708 } else { 1709 Diag(loc, diag::err_typecheck_sub_ptr_object, 1710 lex->getType().getAsString(), lex->getSourceRange()); 1711 return QualType(); 1712 } 1713 } 1714 1715 // The result type of a pointer-int computation is the pointer type. 1716 if (rex->getType()->isIntegerType()) 1717 return lex->getType(); 1718 1719 // Handle pointer-pointer subtractions. 1720 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 1721 QualType rpointee = RHSPTy->getPointeeType(); 1722 1723 // RHS must be an object type, unless void (GNU). 1724 if (!rpointee->isObjectType()) { 1725 // Handle the GNU void* extension. 1726 if (rpointee->isVoidType()) { 1727 if (!lpointee->isVoidType()) 1728 Diag(loc, diag::ext_gnu_void_ptr, 1729 lex->getSourceRange(), rex->getSourceRange()); 1730 } else { 1731 Diag(loc, diag::err_typecheck_sub_ptr_object, 1732 rex->getType().getAsString(), rex->getSourceRange()); 1733 return QualType(); 1734 } 1735 } 1736 1737 // Pointee types must be compatible. 1738 if (!Context.typesAreCompatible( 1739 Context.getCanonicalType(lpointee).getUnqualifiedType(), 1740 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 1741 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 1742 lex->getType().getAsString(), rex->getType().getAsString(), 1743 lex->getSourceRange(), rex->getSourceRange()); 1744 return QualType(); 1745 } 1746 1747 return Context.getPointerDiffType(); 1748 } 1749 } 1750 1751 return InvalidOperands(loc, lex, rex); 1752} 1753 1754// C99 6.5.7 1755QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1756 bool isCompAssign) { 1757 // C99 6.5.7p2: Each of the operands shall have integer type. 1758 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 1759 return InvalidOperands(loc, lex, rex); 1760 1761 // Shifts don't perform usual arithmetic conversions, they just do integer 1762 // promotions on each operand. C99 6.5.7p3 1763 if (!isCompAssign) 1764 UsualUnaryConversions(lex); 1765 UsualUnaryConversions(rex); 1766 1767 // "The type of the result is that of the promoted left operand." 1768 return lex->getType(); 1769} 1770 1771static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 1772 ASTContext& Context) { 1773 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 1774 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 1775 // ID acts sort of like void* for ObjC interfaces 1776 if (LHSIface && Context.isObjCIdType(RHS)) 1777 return true; 1778 if (RHSIface && Context.isObjCIdType(LHS)) 1779 return true; 1780 if (!LHSIface || !RHSIface) 1781 return false; 1782 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 1783 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 1784} 1785 1786// C99 6.5.8 1787QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1788 bool isRelational) { 1789 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1790 return CheckVectorCompareOperands(lex, rex, loc, isRelational); 1791 1792 // C99 6.5.8p3 / C99 6.5.9p4 1793 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1794 UsualArithmeticConversions(lex, rex); 1795 else { 1796 UsualUnaryConversions(lex); 1797 UsualUnaryConversions(rex); 1798 } 1799 QualType lType = lex->getType(); 1800 QualType rType = rex->getType(); 1801 1802 // For non-floating point types, check for self-comparisons of the form 1803 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 1804 // often indicate logic errors in the program. 1805 if (!lType->isFloatingType()) { 1806 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 1807 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 1808 if (DRL->getDecl() == DRR->getDecl()) 1809 Diag(loc, diag::warn_selfcomparison); 1810 } 1811 1812 if (isRelational) { 1813 if (lType->isRealType() && rType->isRealType()) 1814 return Context.IntTy; 1815 } else { 1816 // Check for comparisons of floating point operands using != and ==. 1817 if (lType->isFloatingType()) { 1818 assert (rType->isFloatingType()); 1819 CheckFloatComparison(loc,lex,rex); 1820 } 1821 1822 if (lType->isArithmeticType() && rType->isArithmeticType()) 1823 return Context.IntTy; 1824 } 1825 1826 bool LHSIsNull = lex->isNullPointerConstant(Context); 1827 bool RHSIsNull = rex->isNullPointerConstant(Context); 1828 1829 // All of the following pointer related warnings are GCC extensions, except 1830 // when handling null pointer constants. One day, we can consider making them 1831 // errors (when -pedantic-errors is enabled). 1832 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 1833 QualType LCanPointeeTy = 1834 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 1835 QualType RCanPointeeTy = 1836 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 1837 1838 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 1839 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 1840 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 1841 RCanPointeeTy.getUnqualifiedType()) && 1842 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 1843 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 1844 lType.getAsString(), rType.getAsString(), 1845 lex->getSourceRange(), rex->getSourceRange()); 1846 } 1847 ImpCastExprToType(rex, lType); // promote the pointer to pointer 1848 return Context.IntTy; 1849 } 1850 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 1851 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 1852 ImpCastExprToType(rex, lType); 1853 return Context.IntTy; 1854 } 1855 } 1856 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 1857 rType->isIntegerType()) { 1858 if (!RHSIsNull) 1859 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 1860 lType.getAsString(), rType.getAsString(), 1861 lex->getSourceRange(), rex->getSourceRange()); 1862 ImpCastExprToType(rex, lType); // promote the integer to pointer 1863 return Context.IntTy; 1864 } 1865 if (lType->isIntegerType() && 1866 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 1867 if (!LHSIsNull) 1868 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 1869 lType.getAsString(), rType.getAsString(), 1870 lex->getSourceRange(), rex->getSourceRange()); 1871 ImpCastExprToType(lex, rType); // promote the integer to pointer 1872 return Context.IntTy; 1873 } 1874 return InvalidOperands(loc, lex, rex); 1875} 1876 1877/// CheckVectorCompareOperands - vector comparisons are a clang extension that 1878/// operates on extended vector types. Instead of producing an IntTy result, 1879/// like a scalar comparison, a vector comparison produces a vector of integer 1880/// types. 1881QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 1882 SourceLocation loc, 1883 bool isRelational) { 1884 // Check to make sure we're operating on vectors of the same type and width, 1885 // Allowing one side to be a scalar of element type. 1886 QualType vType = CheckVectorOperands(loc, lex, rex); 1887 if (vType.isNull()) 1888 return vType; 1889 1890 QualType lType = lex->getType(); 1891 QualType rType = rex->getType(); 1892 1893 // For non-floating point types, check for self-comparisons of the form 1894 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 1895 // often indicate logic errors in the program. 1896 if (!lType->isFloatingType()) { 1897 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 1898 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 1899 if (DRL->getDecl() == DRR->getDecl()) 1900 Diag(loc, diag::warn_selfcomparison); 1901 } 1902 1903 // Check for comparisons of floating point operands using != and ==. 1904 if (!isRelational && lType->isFloatingType()) { 1905 assert (rType->isFloatingType()); 1906 CheckFloatComparison(loc,lex,rex); 1907 } 1908 1909 // Return the type for the comparison, which is the same as vector type for 1910 // integer vectors, or an integer type of identical size and number of 1911 // elements for floating point vectors. 1912 if (lType->isIntegerType()) 1913 return lType; 1914 1915 const VectorType *VTy = lType->getAsVectorType(); 1916 1917 // FIXME: need to deal with non-32b int / non-64b long long 1918 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 1919 if (TypeSize == 32) { 1920 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 1921 } 1922 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 1923 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 1924} 1925 1926inline QualType Sema::CheckBitwiseOperands( 1927 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1928{ 1929 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1930 return CheckVectorOperands(loc, lex, rex); 1931 1932 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1933 1934 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1935 return compType; 1936 return InvalidOperands(loc, lex, rex); 1937} 1938 1939inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 1940 Expr *&lex, Expr *&rex, SourceLocation loc) 1941{ 1942 UsualUnaryConversions(lex); 1943 UsualUnaryConversions(rex); 1944 1945 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 1946 return Context.IntTy; 1947 return InvalidOperands(loc, lex, rex); 1948} 1949 1950inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 1951 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 1952{ 1953 QualType lhsType = lex->getType(); 1954 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 1955 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(Context); 1956 1957 switch (mlval) { // C99 6.5.16p2 1958 case Expr::MLV_Valid: 1959 break; 1960 case Expr::MLV_ConstQualified: 1961 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 1962 return QualType(); 1963 case Expr::MLV_ArrayType: 1964 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 1965 lhsType.getAsString(), lex->getSourceRange()); 1966 return QualType(); 1967 case Expr::MLV_NotObjectType: 1968 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 1969 lhsType.getAsString(), lex->getSourceRange()); 1970 return QualType(); 1971 case Expr::MLV_InvalidExpression: 1972 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 1973 lex->getSourceRange()); 1974 return QualType(); 1975 case Expr::MLV_IncompleteType: 1976 case Expr::MLV_IncompleteVoidType: 1977 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 1978 lhsType.getAsString(), lex->getSourceRange()); 1979 return QualType(); 1980 case Expr::MLV_DuplicateVectorComponents: 1981 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 1982 lex->getSourceRange()); 1983 return QualType(); 1984 } 1985 1986 AssignConvertType ConvTy; 1987 if (compoundType.isNull()) { 1988 // Simple assignment "x = y". 1989 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 1990 1991 // If the RHS is a unary plus or minus, check to see if they = and + are 1992 // right next to each other. If so, the user may have typo'd "x =+ 4" 1993 // instead of "x += 4". 1994 Expr *RHSCheck = rex; 1995 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 1996 RHSCheck = ICE->getSubExpr(); 1997 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 1998 if ((UO->getOpcode() == UnaryOperator::Plus || 1999 UO->getOpcode() == UnaryOperator::Minus) && 2000 loc.isFileID() && UO->getOperatorLoc().isFileID() && 2001 // Only if the two operators are exactly adjacent. 2002 loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2003 Diag(loc, diag::warn_not_compound_assign, 2004 UO->getOpcode() == UnaryOperator::Plus ? "+" : "-", 2005 SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc())); 2006 } 2007 } else { 2008 // Compound assignment "x += y" 2009 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 2010 } 2011 2012 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 2013 rex, "assigning")) 2014 return QualType(); 2015 2016 // C99 6.5.16p3: The type of an assignment expression is the type of the 2017 // left operand unless the left operand has qualified type, in which case 2018 // it is the unqualified version of the type of the left operand. 2019 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2020 // is converted to the type of the assignment expression (above). 2021 // C++ 5.17p1: the type of the assignment expression is that of its left 2022 // oprdu. 2023 return lhsType.getUnqualifiedType(); 2024} 2025 2026inline QualType Sema::CheckCommaOperands( // C99 6.5.17 2027 Expr *&lex, Expr *&rex, SourceLocation loc) { 2028 2029 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2030 DefaultFunctionArrayConversion(rex); 2031 return rex->getType(); 2032} 2033 2034/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2035/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2036QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 2037 QualType resType = op->getType(); 2038 assert(!resType.isNull() && "no type for increment/decrement expression"); 2039 2040 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2041 if (const PointerType *pt = resType->getAsPointerType()) { 2042 if (pt->getPointeeType()->isVoidType()) { 2043 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 2044 } else if (!pt->getPointeeType()->isObjectType()) { 2045 // C99 6.5.2.4p2, 6.5.6p2 2046 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 2047 resType.getAsString(), op->getSourceRange()); 2048 return QualType(); 2049 } 2050 } else if (!resType->isRealType()) { 2051 if (resType->isComplexType()) 2052 // C99 does not support ++/-- on complex types. 2053 Diag(OpLoc, diag::ext_integer_increment_complex, 2054 resType.getAsString(), op->getSourceRange()); 2055 else { 2056 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 2057 resType.getAsString(), op->getSourceRange()); 2058 return QualType(); 2059 } 2060 } 2061 // At this point, we know we have a real, complex or pointer type. 2062 // Now make sure the operand is a modifiable lvalue. 2063 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(Context); 2064 if (mlval != Expr::MLV_Valid) { 2065 // FIXME: emit a more precise diagnostic... 2066 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 2067 op->getSourceRange()); 2068 return QualType(); 2069 } 2070 return resType; 2071} 2072 2073/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2074/// This routine allows us to typecheck complex/recursive expressions 2075/// where the declaration is needed for type checking. We only need to 2076/// handle cases when the expression references a function designator 2077/// or is an lvalue. Here are some examples: 2078/// - &(x) => x 2079/// - &*****f => f for f a function designator. 2080/// - &s.xx => s 2081/// - &s.zz[1].yy -> s, if zz is an array 2082/// - *(x + 1) -> x, if x is an array 2083/// - &"123"[2] -> 0 2084/// - & __real__ x -> x 2085static ValueDecl *getPrimaryDecl(Expr *E) { 2086 switch (E->getStmtClass()) { 2087 case Stmt::DeclRefExprClass: 2088 return cast<DeclRefExpr>(E)->getDecl(); 2089 case Stmt::MemberExprClass: 2090 // Fields cannot be declared with a 'register' storage class. 2091 // &X->f is always ok, even if X is declared register. 2092 if (cast<MemberExpr>(E)->isArrow()) 2093 return 0; 2094 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2095 case Stmt::ArraySubscriptExprClass: { 2096 // &X[4] and &4[X] refers to X if X is not a pointer. 2097 2098 ValueDecl *VD = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2099 if (!VD || VD->getType()->isPointerType()) 2100 return 0; 2101 else 2102 return VD; 2103 } 2104 case Stmt::UnaryOperatorClass: { 2105 UnaryOperator *UO = cast<UnaryOperator>(E); 2106 2107 switch(UO->getOpcode()) { 2108 case UnaryOperator::Deref: { 2109 // *(X + 1) refers to X if X is not a pointer. 2110 ValueDecl *VD = getPrimaryDecl(UO->getSubExpr()); 2111 if (!VD || VD->getType()->isPointerType()) 2112 return 0; 2113 return VD; 2114 } 2115 case UnaryOperator::Real: 2116 case UnaryOperator::Imag: 2117 case UnaryOperator::Extension: 2118 return getPrimaryDecl(UO->getSubExpr()); 2119 default: 2120 return 0; 2121 } 2122 } 2123 case Stmt::BinaryOperatorClass: { 2124 BinaryOperator *BO = cast<BinaryOperator>(E); 2125 2126 // Handle cases involving pointer arithmetic. The result of an 2127 // Assign or AddAssign is not an lvalue so they can be ignored. 2128 2129 // (x + n) or (n + x) => x 2130 if (BO->getOpcode() == BinaryOperator::Add) { 2131 if (BO->getLHS()->getType()->isPointerType()) { 2132 return getPrimaryDecl(BO->getLHS()); 2133 } else if (BO->getRHS()->getType()->isPointerType()) { 2134 return getPrimaryDecl(BO->getRHS()); 2135 } 2136 } 2137 2138 return 0; 2139 } 2140 case Stmt::ParenExprClass: 2141 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2142 case Stmt::ImplicitCastExprClass: 2143 // &X[4] when X is an array, has an implicit cast from array to pointer. 2144 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2145 default: 2146 return 0; 2147 } 2148} 2149 2150/// CheckAddressOfOperand - The operand of & must be either a function 2151/// designator or an lvalue designating an object. If it is an lvalue, the 2152/// object cannot be declared with storage class register or be a bit field. 2153/// Note: The usual conversions are *not* applied to the operand of the & 2154/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2155QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2156 if (getLangOptions().C99) { 2157 // Implement C99-only parts of addressof rules. 2158 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2159 if (uOp->getOpcode() == UnaryOperator::Deref) 2160 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2161 // (assuming the deref expression is valid). 2162 return uOp->getSubExpr()->getType(); 2163 } 2164 // Technically, there should be a check for array subscript 2165 // expressions here, but the result of one is always an lvalue anyway. 2166 } 2167 ValueDecl *dcl = getPrimaryDecl(op); 2168 Expr::isLvalueResult lval = op->isLvalue(Context); 2169 2170 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2171 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2172 // FIXME: emit more specific diag... 2173 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 2174 op->getSourceRange()); 2175 return QualType(); 2176 } 2177 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2178 if (MemExpr->getMemberDecl()->isBitField()) { 2179 Diag(OpLoc, diag::err_typecheck_address_of, 2180 std::string("bit-field"), op->getSourceRange()); 2181 return QualType(); 2182 } 2183 // Check for Apple extension for accessing vector components. 2184 } else if (isa<ArraySubscriptExpr>(op) && 2185 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2186 Diag(OpLoc, diag::err_typecheck_address_of, 2187 std::string("vector"), op->getSourceRange()); 2188 return QualType(); 2189 } else if (dcl) { // C99 6.5.3.2p1 2190 // We have an lvalue with a decl. Make sure the decl is not declared 2191 // with the register storage-class specifier. 2192 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2193 if (vd->getStorageClass() == VarDecl::Register) { 2194 Diag(OpLoc, diag::err_typecheck_address_of, 2195 std::string("register variable"), op->getSourceRange()); 2196 return QualType(); 2197 } 2198 } else 2199 assert(0 && "Unknown/unexpected decl type"); 2200 } 2201 2202 // If the operand has type "type", the result has type "pointer to type". 2203 return Context.getPointerType(op->getType()); 2204} 2205 2206QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 2207 UsualUnaryConversions(op); 2208 QualType qType = op->getType(); 2209 2210 if (const PointerType *PT = qType->getAsPointerType()) { 2211 // Note that per both C89 and C99, this is always legal, even 2212 // if ptype is an incomplete type or void. 2213 // It would be possible to warn about dereferencing a 2214 // void pointer, but it's completely well-defined, 2215 // and such a warning is unlikely to catch any mistakes. 2216 return PT->getPointeeType(); 2217 } 2218 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 2219 qType.getAsString(), op->getSourceRange()); 2220 return QualType(); 2221} 2222 2223static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2224 tok::TokenKind Kind) { 2225 BinaryOperator::Opcode Opc; 2226 switch (Kind) { 2227 default: assert(0 && "Unknown binop!"); 2228 case tok::star: Opc = BinaryOperator::Mul; break; 2229 case tok::slash: Opc = BinaryOperator::Div; break; 2230 case tok::percent: Opc = BinaryOperator::Rem; break; 2231 case tok::plus: Opc = BinaryOperator::Add; break; 2232 case tok::minus: Opc = BinaryOperator::Sub; break; 2233 case tok::lessless: Opc = BinaryOperator::Shl; break; 2234 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2235 case tok::lessequal: Opc = BinaryOperator::LE; break; 2236 case tok::less: Opc = BinaryOperator::LT; break; 2237 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2238 case tok::greater: Opc = BinaryOperator::GT; break; 2239 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2240 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2241 case tok::amp: Opc = BinaryOperator::And; break; 2242 case tok::caret: Opc = BinaryOperator::Xor; break; 2243 case tok::pipe: Opc = BinaryOperator::Or; break; 2244 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2245 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2246 case tok::equal: Opc = BinaryOperator::Assign; break; 2247 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2248 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2249 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2250 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2251 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2252 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2253 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2254 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2255 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2256 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2257 case tok::comma: Opc = BinaryOperator::Comma; break; 2258 } 2259 return Opc; 2260} 2261 2262static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2263 tok::TokenKind Kind) { 2264 UnaryOperator::Opcode Opc; 2265 switch (Kind) { 2266 default: assert(0 && "Unknown unary op!"); 2267 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2268 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2269 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2270 case tok::star: Opc = UnaryOperator::Deref; break; 2271 case tok::plus: Opc = UnaryOperator::Plus; break; 2272 case tok::minus: Opc = UnaryOperator::Minus; break; 2273 case tok::tilde: Opc = UnaryOperator::Not; break; 2274 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2275 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 2276 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 2277 case tok::kw___real: Opc = UnaryOperator::Real; break; 2278 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2279 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2280 } 2281 return Opc; 2282} 2283 2284// Binary Operators. 'Tok' is the token for the operator. 2285Action::ExprResult Sema::ActOnBinOp(SourceLocation TokLoc, tok::TokenKind Kind, 2286 ExprTy *LHS, ExprTy *RHS) { 2287 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 2288 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 2289 2290 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 2291 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 2292 2293 QualType ResultTy; // Result type of the binary operator. 2294 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2295 2296 switch (Opc) { 2297 default: 2298 assert(0 && "Unknown binary expr!"); 2299 case BinaryOperator::Assign: 2300 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, QualType()); 2301 break; 2302 case BinaryOperator::Mul: 2303 case BinaryOperator::Div: 2304 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc); 2305 break; 2306 case BinaryOperator::Rem: 2307 ResultTy = CheckRemainderOperands(lhs, rhs, TokLoc); 2308 break; 2309 case BinaryOperator::Add: 2310 ResultTy = CheckAdditionOperands(lhs, rhs, TokLoc); 2311 break; 2312 case BinaryOperator::Sub: 2313 ResultTy = CheckSubtractionOperands(lhs, rhs, TokLoc); 2314 break; 2315 case BinaryOperator::Shl: 2316 case BinaryOperator::Shr: 2317 ResultTy = CheckShiftOperands(lhs, rhs, TokLoc); 2318 break; 2319 case BinaryOperator::LE: 2320 case BinaryOperator::LT: 2321 case BinaryOperator::GE: 2322 case BinaryOperator::GT: 2323 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, true); 2324 break; 2325 case BinaryOperator::EQ: 2326 case BinaryOperator::NE: 2327 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, false); 2328 break; 2329 case BinaryOperator::And: 2330 case BinaryOperator::Xor: 2331 case BinaryOperator::Or: 2332 ResultTy = CheckBitwiseOperands(lhs, rhs, TokLoc); 2333 break; 2334 case BinaryOperator::LAnd: 2335 case BinaryOperator::LOr: 2336 ResultTy = CheckLogicalOperands(lhs, rhs, TokLoc); 2337 break; 2338 case BinaryOperator::MulAssign: 2339 case BinaryOperator::DivAssign: 2340 CompTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc, true); 2341 if (!CompTy.isNull()) 2342 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2343 break; 2344 case BinaryOperator::RemAssign: 2345 CompTy = CheckRemainderOperands(lhs, rhs, TokLoc, true); 2346 if (!CompTy.isNull()) 2347 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2348 break; 2349 case BinaryOperator::AddAssign: 2350 CompTy = CheckAdditionOperands(lhs, rhs, TokLoc, true); 2351 if (!CompTy.isNull()) 2352 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2353 break; 2354 case BinaryOperator::SubAssign: 2355 CompTy = CheckSubtractionOperands(lhs, rhs, TokLoc, true); 2356 if (!CompTy.isNull()) 2357 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2358 break; 2359 case BinaryOperator::ShlAssign: 2360 case BinaryOperator::ShrAssign: 2361 CompTy = CheckShiftOperands(lhs, rhs, TokLoc, true); 2362 if (!CompTy.isNull()) 2363 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2364 break; 2365 case BinaryOperator::AndAssign: 2366 case BinaryOperator::XorAssign: 2367 case BinaryOperator::OrAssign: 2368 CompTy = CheckBitwiseOperands(lhs, rhs, TokLoc, true); 2369 if (!CompTy.isNull()) 2370 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2371 break; 2372 case BinaryOperator::Comma: 2373 ResultTy = CheckCommaOperands(lhs, rhs, TokLoc); 2374 break; 2375 } 2376 if (ResultTy.isNull()) 2377 return true; 2378 if (CompTy.isNull()) 2379 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 2380 else 2381 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, TokLoc); 2382} 2383 2384// Unary Operators. 'Tok' is the token for the operator. 2385Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2386 ExprTy *input) { 2387 Expr *Input = (Expr*)input; 2388 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2389 QualType resultType; 2390 switch (Opc) { 2391 default: 2392 assert(0 && "Unimplemented unary expr!"); 2393 case UnaryOperator::PreInc: 2394 case UnaryOperator::PreDec: 2395 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2396 break; 2397 case UnaryOperator::AddrOf: 2398 resultType = CheckAddressOfOperand(Input, OpLoc); 2399 break; 2400 case UnaryOperator::Deref: 2401 DefaultFunctionArrayConversion(Input); 2402 resultType = CheckIndirectionOperand(Input, OpLoc); 2403 break; 2404 case UnaryOperator::Plus: 2405 case UnaryOperator::Minus: 2406 UsualUnaryConversions(Input); 2407 resultType = Input->getType(); 2408 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2409 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2410 resultType.getAsString()); 2411 break; 2412 case UnaryOperator::Not: // bitwise complement 2413 UsualUnaryConversions(Input); 2414 resultType = Input->getType(); 2415 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 2416 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 2417 // C99 does not support '~' for complex conjugation. 2418 Diag(OpLoc, diag::ext_integer_complement_complex, 2419 resultType.getAsString(), Input->getSourceRange()); 2420 else if (!resultType->isIntegerType()) 2421 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2422 resultType.getAsString(), Input->getSourceRange()); 2423 break; 2424 case UnaryOperator::LNot: // logical negation 2425 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2426 DefaultFunctionArrayConversion(Input); 2427 resultType = Input->getType(); 2428 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2429 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2430 resultType.getAsString()); 2431 // LNot always has type int. C99 6.5.3.3p5. 2432 resultType = Context.IntTy; 2433 break; 2434 case UnaryOperator::SizeOf: 2435 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2436 Input->getSourceRange(), true); 2437 break; 2438 case UnaryOperator::AlignOf: 2439 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2440 Input->getSourceRange(), false); 2441 break; 2442 case UnaryOperator::Real: 2443 case UnaryOperator::Imag: 2444 resultType = CheckRealImagOperand(Input, OpLoc); 2445 break; 2446 case UnaryOperator::Extension: 2447 resultType = Input->getType(); 2448 break; 2449 } 2450 if (resultType.isNull()) 2451 return true; 2452 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2453} 2454 2455/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2456Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2457 SourceLocation LabLoc, 2458 IdentifierInfo *LabelII) { 2459 // Look up the record for this label identifier. 2460 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2461 2462 // If we haven't seen this label yet, create a forward reference. It 2463 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 2464 if (LabelDecl == 0) 2465 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2466 2467 // Create the AST node. The address of a label always has type 'void*'. 2468 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2469 Context.getPointerType(Context.VoidTy)); 2470} 2471 2472Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2473 SourceLocation RPLoc) { // "({..})" 2474 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2475 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2476 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2477 2478 // FIXME: there are a variety of strange constraints to enforce here, for 2479 // example, it is not possible to goto into a stmt expression apparently. 2480 // More semantic analysis is needed. 2481 2482 // FIXME: the last statement in the compount stmt has its value used. We 2483 // should not warn about it being unused. 2484 2485 // If there are sub stmts in the compound stmt, take the type of the last one 2486 // as the type of the stmtexpr. 2487 QualType Ty = Context.VoidTy; 2488 2489 if (!Compound->body_empty()) { 2490 Stmt *LastStmt = Compound->body_back(); 2491 // If LastStmt is a label, skip down through into the body. 2492 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 2493 LastStmt = Label->getSubStmt(); 2494 2495 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 2496 Ty = LastExpr->getType(); 2497 } 2498 2499 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2500} 2501 2502Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2503 SourceLocation TypeLoc, 2504 TypeTy *argty, 2505 OffsetOfComponent *CompPtr, 2506 unsigned NumComponents, 2507 SourceLocation RPLoc) { 2508 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2509 assert(!ArgTy.isNull() && "Missing type argument!"); 2510 2511 // We must have at least one component that refers to the type, and the first 2512 // one is known to be a field designator. Verify that the ArgTy represents 2513 // a struct/union/class. 2514 if (!ArgTy->isRecordType()) 2515 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2516 2517 // Otherwise, create a compound literal expression as the base, and 2518 // iteratively process the offsetof designators. 2519 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2520 2521 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2522 // GCC extension, diagnose them. 2523 if (NumComponents != 1) 2524 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2525 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2526 2527 for (unsigned i = 0; i != NumComponents; ++i) { 2528 const OffsetOfComponent &OC = CompPtr[i]; 2529 if (OC.isBrackets) { 2530 // Offset of an array sub-field. TODO: Should we allow vector elements? 2531 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 2532 if (!AT) { 2533 delete Res; 2534 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 2535 Res->getType().getAsString()); 2536 } 2537 2538 // FIXME: C++: Verify that operator[] isn't overloaded. 2539 2540 // C99 6.5.2.1p1 2541 Expr *Idx = static_cast<Expr*>(OC.U.E); 2542 if (!Idx->getType()->isIntegerType()) 2543 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 2544 Idx->getSourceRange()); 2545 2546 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 2547 continue; 2548 } 2549 2550 const RecordType *RC = Res->getType()->getAsRecordType(); 2551 if (!RC) { 2552 delete Res; 2553 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 2554 Res->getType().getAsString()); 2555 } 2556 2557 // Get the decl corresponding to this. 2558 RecordDecl *RD = RC->getDecl(); 2559 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 2560 if (!MemberDecl) 2561 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 2562 OC.U.IdentInfo->getName(), 2563 SourceRange(OC.LocStart, OC.LocEnd)); 2564 2565 // FIXME: C++: Verify that MemberDecl isn't a static field. 2566 // FIXME: Verify that MemberDecl isn't a bitfield. 2567 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 2568 // matter here. 2569 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, MemberDecl->getType()); 2570 } 2571 2572 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 2573 BuiltinLoc); 2574} 2575 2576 2577Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 2578 TypeTy *arg1, TypeTy *arg2, 2579 SourceLocation RPLoc) { 2580 QualType argT1 = QualType::getFromOpaquePtr(arg1); 2581 QualType argT2 = QualType::getFromOpaquePtr(arg2); 2582 2583 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 2584 2585 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 2586} 2587 2588Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 2589 ExprTy *expr1, ExprTy *expr2, 2590 SourceLocation RPLoc) { 2591 Expr *CondExpr = static_cast<Expr*>(cond); 2592 Expr *LHSExpr = static_cast<Expr*>(expr1); 2593 Expr *RHSExpr = static_cast<Expr*>(expr2); 2594 2595 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 2596 2597 // The conditional expression is required to be a constant expression. 2598 llvm::APSInt condEval(32); 2599 SourceLocation ExpLoc; 2600 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 2601 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 2602 CondExpr->getSourceRange()); 2603 2604 // If the condition is > zero, then the AST type is the same as the LSHExpr. 2605 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 2606 RHSExpr->getType(); 2607 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 2608} 2609 2610/// ExprsMatchFnType - return true if the Exprs in array Args have 2611/// QualTypes that match the QualTypes of the arguments of the FnType. 2612/// The number of arguments has already been validated to match the number of 2613/// arguments in FnType. 2614static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 2615 ASTContext &Context) { 2616 unsigned NumParams = FnType->getNumArgs(); 2617 for (unsigned i = 0; i != NumParams; ++i) { 2618 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 2619 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 2620 2621 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 2622 return false; 2623 } 2624 return true; 2625} 2626 2627Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 2628 SourceLocation *CommaLocs, 2629 SourceLocation BuiltinLoc, 2630 SourceLocation RParenLoc) { 2631 // __builtin_overload requires at least 2 arguments 2632 if (NumArgs < 2) 2633 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2634 SourceRange(BuiltinLoc, RParenLoc)); 2635 2636 // The first argument is required to be a constant expression. It tells us 2637 // the number of arguments to pass to each of the functions to be overloaded. 2638 Expr **Args = reinterpret_cast<Expr**>(args); 2639 Expr *NParamsExpr = Args[0]; 2640 llvm::APSInt constEval(32); 2641 SourceLocation ExpLoc; 2642 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 2643 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2644 NParamsExpr->getSourceRange()); 2645 2646 // Verify that the number of parameters is > 0 2647 unsigned NumParams = constEval.getZExtValue(); 2648 if (NumParams == 0) 2649 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2650 NParamsExpr->getSourceRange()); 2651 // Verify that we have at least 1 + NumParams arguments to the builtin. 2652 if ((NumParams + 1) > NumArgs) 2653 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2654 SourceRange(BuiltinLoc, RParenLoc)); 2655 2656 // Figure out the return type, by matching the args to one of the functions 2657 // listed after the parameters. 2658 OverloadExpr *OE = 0; 2659 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 2660 // UsualUnaryConversions will convert the function DeclRefExpr into a 2661 // pointer to function. 2662 Expr *Fn = UsualUnaryConversions(Args[i]); 2663 const FunctionTypeProto *FnType = 0; 2664 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 2665 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 2666 2667 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 2668 // parameters, and the number of parameters must match the value passed to 2669 // the builtin. 2670 if (!FnType || (FnType->getNumArgs() != NumParams)) 2671 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 2672 Fn->getSourceRange()); 2673 2674 // Scan the parameter list for the FunctionType, checking the QualType of 2675 // each parameter against the QualTypes of the arguments to the builtin. 2676 // If they match, return a new OverloadExpr. 2677 if (ExprsMatchFnType(Args+1, FnType, Context)) { 2678 if (OE) 2679 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 2680 OE->getFn()->getSourceRange()); 2681 // Remember our match, and continue processing the remaining arguments 2682 // to catch any errors. 2683 OE = new OverloadExpr(Args, NumArgs, i, FnType->getResultType(), 2684 BuiltinLoc, RParenLoc); 2685 } 2686 } 2687 // Return the newly created OverloadExpr node, if we succeded in matching 2688 // exactly one of the candidate functions. 2689 if (OE) 2690 return OE; 2691 2692 // If we didn't find a matching function Expr in the __builtin_overload list 2693 // the return an error. 2694 std::string typeNames; 2695 for (unsigned i = 0; i != NumParams; ++i) { 2696 if (i != 0) typeNames += ", "; 2697 typeNames += Args[i+1]->getType().getAsString(); 2698 } 2699 2700 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 2701 SourceRange(BuiltinLoc, RParenLoc)); 2702} 2703 2704Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 2705 ExprTy *expr, TypeTy *type, 2706 SourceLocation RPLoc) { 2707 Expr *E = static_cast<Expr*>(expr); 2708 QualType T = QualType::getFromOpaquePtr(type); 2709 2710 InitBuiltinVaListType(); 2711 2712 // Get the va_list type 2713 QualType VaListType = Context.getBuiltinVaListType(); 2714 // Deal with implicit array decay; for example, on x86-64, 2715 // va_list is an array, but it's supposed to decay to 2716 // a pointer for va_arg. 2717 if (VaListType->isArrayType()) 2718 VaListType = Context.getArrayDecayedType(VaListType); 2719 // Make sure the input expression also decays appropriately. 2720 UsualUnaryConversions(E); 2721 2722 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 2723 return Diag(E->getLocStart(), 2724 diag::err_first_argument_to_va_arg_not_of_type_va_list, 2725 E->getType().getAsString(), 2726 E->getSourceRange()); 2727 2728 // FIXME: Warn if a non-POD type is passed in. 2729 2730 return new VAArgExpr(BuiltinLoc, E, T, RPLoc); 2731} 2732 2733bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 2734 SourceLocation Loc, 2735 QualType DstType, QualType SrcType, 2736 Expr *SrcExpr, const char *Flavor) { 2737 // Decode the result (notice that AST's are still created for extensions). 2738 bool isInvalid = false; 2739 unsigned DiagKind; 2740 switch (ConvTy) { 2741 default: assert(0 && "Unknown conversion type"); 2742 case Compatible: return false; 2743 case PointerToInt: 2744 DiagKind = diag::ext_typecheck_convert_pointer_int; 2745 break; 2746 case IntToPointer: 2747 DiagKind = diag::ext_typecheck_convert_int_pointer; 2748 break; 2749 case IncompatiblePointer: 2750 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 2751 break; 2752 case FunctionVoidPointer: 2753 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 2754 break; 2755 case CompatiblePointerDiscardsQualifiers: 2756 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 2757 break; 2758 case Incompatible: 2759 DiagKind = diag::err_typecheck_convert_incompatible; 2760 isInvalid = true; 2761 break; 2762 } 2763 2764 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 2765 SrcExpr->getSourceRange()); 2766 return isInvalid; 2767} 2768