SemaExpr.cpp revision 3454b6cd8d58c98e2a867fb1104af11e1c183f68
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/Lex/Preprocessor.h" 20#include "clang/Lex/LiteralSupport.h" 21#include "clang/Basic/Diagnostic.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Scope.h" 26using namespace clang; 27 28//===----------------------------------------------------------------------===// 29// Standard Promotions and Conversions 30//===----------------------------------------------------------------------===// 31 32/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 33void Sema::DefaultFunctionArrayConversion(Expr *&E) { 34 QualType Ty = E->getType(); 35 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 36 37 if (const ReferenceType *ref = Ty->getAsReferenceType()) { 38 ImpCastExprToType(E, ref->getPointeeType()); // C++ [expr] 39 Ty = E->getType(); 40 } 41 if (Ty->isFunctionType()) 42 ImpCastExprToType(E, Context.getPointerType(Ty)); 43 else if (Ty->isArrayType()) { 44 // In C90 mode, arrays only promote to pointers if the array expression is 45 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 46 // type 'array of type' is converted to an expression that has type 'pointer 47 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 48 // that has type 'array of type' ...". The relevant change is "an lvalue" 49 // (C90) to "an expression" (C99). 50 if (getLangOptions().C99 || E->isLvalue(Context) == Expr::LV_Valid) 51 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 52 } 53} 54 55/// UsualUnaryConversions - Performs various conversions that are common to most 56/// operators (C99 6.3). The conversions of array and function types are 57/// sometimes surpressed. For example, the array->pointer conversion doesn't 58/// apply if the array is an argument to the sizeof or address (&) operators. 59/// In these instances, this routine should *not* be called. 60Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 61 QualType Ty = Expr->getType(); 62 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 63 64 if (const ReferenceType *Ref = Ty->getAsReferenceType()) { 65 ImpCastExprToType(Expr, Ref->getPointeeType()); // C++ [expr] 66 Ty = Expr->getType(); 67 } 68 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 69 ImpCastExprToType(Expr, Context.IntTy); 70 else 71 DefaultFunctionArrayConversion(Expr); 72 73 return Expr; 74} 75 76/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 77/// do not have a prototype. Arguments that have type float are promoted to 78/// double. All other argument types are converted by UsualUnaryConversions(). 79void Sema::DefaultArgumentPromotion(Expr *&Expr) { 80 QualType Ty = Expr->getType(); 81 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 82 83 // If this is a 'float' (CVR qualified or typedef) promote to double. 84 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 85 if (BT->getKind() == BuiltinType::Float) 86 return ImpCastExprToType(Expr, Context.DoubleTy); 87 88 UsualUnaryConversions(Expr); 89} 90 91/// UsualArithmeticConversions - Performs various conversions that are common to 92/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 93/// routine returns the first non-arithmetic type found. The client is 94/// responsible for emitting appropriate error diagnostics. 95/// FIXME: verify the conversion rules for "complex int" are consistent with 96/// GCC. 97QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 98 bool isCompAssign) { 99 if (!isCompAssign) { 100 UsualUnaryConversions(lhsExpr); 101 UsualUnaryConversions(rhsExpr); 102 } 103 // For conversion purposes, we ignore any qualifiers. 104 // For example, "const float" and "float" are equivalent. 105 QualType lhs = 106 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 107 QualType rhs = 108 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 109 110 // If both types are identical, no conversion is needed. 111 if (lhs == rhs) 112 return lhs; 113 114 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 115 // The caller can deal with this (e.g. pointer + int). 116 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 117 return lhs; 118 119 // At this point, we have two different arithmetic types. 120 121 // Handle complex types first (C99 6.3.1.8p1). 122 if (lhs->isComplexType() || rhs->isComplexType()) { 123 // if we have an integer operand, the result is the complex type. 124 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 125 // convert the rhs to the lhs complex type. 126 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 127 return lhs; 128 } 129 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 130 // convert the lhs to the rhs complex type. 131 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 132 return rhs; 133 } 134 // This handles complex/complex, complex/float, or float/complex. 135 // When both operands are complex, the shorter operand is converted to the 136 // type of the longer, and that is the type of the result. This corresponds 137 // to what is done when combining two real floating-point operands. 138 // The fun begins when size promotion occur across type domains. 139 // From H&S 6.3.4: When one operand is complex and the other is a real 140 // floating-point type, the less precise type is converted, within it's 141 // real or complex domain, to the precision of the other type. For example, 142 // when combining a "long double" with a "double _Complex", the 143 // "double _Complex" is promoted to "long double _Complex". 144 int result = Context.getFloatingTypeOrder(lhs, rhs); 145 146 if (result > 0) { // The left side is bigger, convert rhs. 147 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 148 if (!isCompAssign) 149 ImpCastExprToType(rhsExpr, rhs); 150 } else if (result < 0) { // The right side is bigger, convert lhs. 151 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 152 if (!isCompAssign) 153 ImpCastExprToType(lhsExpr, lhs); 154 } 155 // At this point, lhs and rhs have the same rank/size. Now, make sure the 156 // domains match. This is a requirement for our implementation, C99 157 // does not require this promotion. 158 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 159 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 160 if (!isCompAssign) 161 ImpCastExprToType(lhsExpr, rhs); 162 return rhs; 163 } else { // handle "_Complex double, double". 164 if (!isCompAssign) 165 ImpCastExprToType(rhsExpr, lhs); 166 return lhs; 167 } 168 } 169 return lhs; // The domain/size match exactly. 170 } 171 // Now handle "real" floating types (i.e. float, double, long double). 172 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 173 // if we have an integer operand, the result is the real floating type. 174 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 175 // convert rhs to the lhs floating point type. 176 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 177 return lhs; 178 } 179 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 180 // convert lhs to the rhs floating point type. 181 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 182 return rhs; 183 } 184 // We have two real floating types, float/complex combos were handled above. 185 // Convert the smaller operand to the bigger result. 186 int result = Context.getFloatingTypeOrder(lhs, rhs); 187 188 if (result > 0) { // convert the rhs 189 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 190 return lhs; 191 } 192 if (result < 0) { // convert the lhs 193 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 194 return rhs; 195 } 196 assert(0 && "Sema::UsualArithmeticConversions(): illegal float comparison"); 197 } 198 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 199 // Handle GCC complex int extension. 200 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 201 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 202 203 if (lhsComplexInt && rhsComplexInt) { 204 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 205 rhsComplexInt->getElementType()) >= 0) { 206 // convert the rhs 207 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 208 return lhs; 209 } 210 if (!isCompAssign) 211 ImpCastExprToType(lhsExpr, rhs); // convert the lhs 212 return rhs; 213 } else if (lhsComplexInt && rhs->isIntegerType()) { 214 // convert the rhs to the lhs complex type. 215 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 216 return lhs; 217 } else if (rhsComplexInt && lhs->isIntegerType()) { 218 // convert the lhs to the rhs complex type. 219 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 220 return rhs; 221 } 222 } 223 // Finally, we have two differing integer types. 224 // The rules for this case are in C99 6.3.1.8 225 int compare = Context.getIntegerTypeOrder(lhs, rhs); 226 bool lhsSigned = lhs->isSignedIntegerType(), 227 rhsSigned = rhs->isSignedIntegerType(); 228 QualType destType; 229 if (lhsSigned == rhsSigned) { 230 // Same signedness; use the higher-ranked type 231 destType = compare >= 0 ? lhs : rhs; 232 } else if (compare != (lhsSigned ? 1 : -1)) { 233 // The unsigned type has greater than or equal rank to the 234 // signed type, so use the unsigned type 235 destType = lhsSigned ? rhs : lhs; 236 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 237 // The two types are different widths; if we are here, that 238 // means the signed type is larger than the unsigned type, so 239 // use the signed type. 240 destType = lhsSigned ? lhs : rhs; 241 } else { 242 // The signed type is higher-ranked than the unsigned type, 243 // but isn't actually any bigger (like unsigned int and long 244 // on most 32-bit systems). Use the unsigned type corresponding 245 // to the signed type. 246 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 247 } 248 if (!isCompAssign) { 249 ImpCastExprToType(lhsExpr, destType); 250 ImpCastExprToType(rhsExpr, destType); 251 } 252 return destType; 253} 254 255//===----------------------------------------------------------------------===// 256// Semantic Analysis for various Expression Types 257//===----------------------------------------------------------------------===// 258 259 260/// ActOnStringLiteral - The specified tokens were lexed as pasted string 261/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 262/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 263/// multiple tokens. However, the common case is that StringToks points to one 264/// string. 265/// 266Action::ExprResult 267Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 268 assert(NumStringToks && "Must have at least one string!"); 269 270 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 271 if (Literal.hadError) 272 return ExprResult(true); 273 274 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 275 for (unsigned i = 0; i != NumStringToks; ++i) 276 StringTokLocs.push_back(StringToks[i].getLocation()); 277 278 // Verify that pascal strings aren't too large. 279 if (Literal.Pascal && Literal.GetStringLength() > 256) 280 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long, 281 SourceRange(StringToks[0].getLocation(), 282 StringToks[NumStringToks-1].getLocation())); 283 284 QualType StrTy = Context.CharTy; 285 if (Literal.AnyWide) StrTy = Context.getWCharType(); 286 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 287 288 // Get an array type for the string, according to C99 6.4.5. This includes 289 // the nul terminator character as well as the string length for pascal 290 // strings. 291 StrTy = Context.getConstantArrayType(StrTy, 292 llvm::APInt(32, Literal.GetStringLength()+1), 293 ArrayType::Normal, 0); 294 295 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 296 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 297 Literal.AnyWide, StrTy, 298 StringToks[0].getLocation(), 299 StringToks[NumStringToks-1].getLocation()); 300} 301 302 303/// ActOnIdentifierExpr - The parser read an identifier in expression context, 304/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 305/// identifier is used in a function call context. 306Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 307 IdentifierInfo &II, 308 bool HasTrailingLParen) { 309 // Could be enum-constant, value decl, instance variable, etc. 310 Decl *D = LookupDecl(&II, Decl::IDNS_Ordinary, S); 311 312 // If this reference is in an Objective-C method, then ivar lookup happens as 313 // well. 314 if (getCurMethodDecl()) { 315 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 316 // There are two cases to handle here. 1) scoped lookup could have failed, 317 // in which case we should look for an ivar. 2) scoped lookup could have 318 // found a decl, but that decl is outside the current method (i.e. a global 319 // variable). In these two cases, we do a lookup for an ivar with this 320 // name, if the lookup suceeds, we replace it our current decl. 321 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 322 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 323 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&II)) { 324 // FIXME: This should use a new expr for a direct reference, don't turn 325 // this into Self->ivar, just return a BareIVarExpr or something. 326 IdentifierInfo &II = Context.Idents.get("self"); 327 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 328 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 329 static_cast<Expr*>(SelfExpr.Val), true, true); 330 } 331 } 332 // Needed to implement property "super.method" notation. 333 if (SD == 0 && &II == SuperID) { 334 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 335 getCurMethodDecl()->getClassInterface())); 336 return new PredefinedExpr(Loc, T, PredefinedExpr::ObjCSuper); 337 } 338 } 339 340 if (D == 0) { 341 // Otherwise, this could be an implicitly declared function reference (legal 342 // in C90, extension in C99). 343 if (HasTrailingLParen && 344 !getLangOptions().CPlusPlus) // Not in C++. 345 D = ImplicitlyDefineFunction(Loc, II, S); 346 else { 347 // If this name wasn't predeclared and if this is not a function call, 348 // diagnose the problem. 349 return Diag(Loc, diag::err_undeclared_var_use, II.getName()); 350 } 351 } 352 353 if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 354 // check if referencing an identifier with __attribute__((deprecated)). 355 if (VD->getAttr<DeprecatedAttr>()) 356 Diag(Loc, diag::warn_deprecated, VD->getName()); 357 358 // Only create DeclRefExpr's for valid Decl's. 359 if (VD->isInvalidDecl()) 360 return true; 361 return new DeclRefExpr(VD, VD->getType(), Loc); 362 } 363 364 if (CXXFieldDecl *FD = dyn_cast<CXXFieldDecl>(D)) { 365 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 366 if (MD->isStatic()) 367 // "invalid use of member 'x' in static member function" 368 return Diag(Loc, diag::err_invalid_member_use_in_static_method, 369 FD->getName()); 370 if (cast<CXXRecordDecl>(MD->getParent()) != FD->getParent()) 371 // "invalid use of nonstatic data member 'x'" 372 return Diag(Loc, diag::err_invalid_non_static_member_use, 373 FD->getName()); 374 375 if (FD->isInvalidDecl()) 376 return true; 377 378 // FIXME: Use DeclRefExpr or a new Expr for a direct CXXField reference. 379 ExprResult ThisExpr = ActOnCXXThis(SourceLocation()); 380 return new MemberExpr(static_cast<Expr*>(ThisExpr.Val), 381 true, FD, Loc, FD->getType()); 382 } 383 384 return Diag(Loc, diag::err_invalid_non_static_member_use, FD->getName()); 385 } 386 387 if (isa<TypedefDecl>(D)) 388 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 389 if (isa<ObjCInterfaceDecl>(D)) 390 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 391 if (isa<NamespaceDecl>(D)) 392 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 393 394 assert(0 && "Invalid decl"); 395 abort(); 396} 397 398Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 399 tok::TokenKind Kind) { 400 PredefinedExpr::IdentType IT; 401 402 switch (Kind) { 403 default: assert(0 && "Unknown simple primary expr!"); 404 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 405 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 406 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 407 } 408 409 // Verify that this is in a function context. 410 if (getCurFunctionDecl() == 0 && getCurMethodDecl() == 0) 411 return Diag(Loc, diag::err_predef_outside_function); 412 413 // Pre-defined identifiers are of type char[x], where x is the length of the 414 // string. 415 unsigned Length; 416 if (getCurFunctionDecl()) 417 Length = getCurFunctionDecl()->getIdentifier()->getLength(); 418 else 419 Length = getCurMethodDecl()->getSynthesizedMethodSize(); 420 421 llvm::APInt LengthI(32, Length + 1); 422 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 423 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 424 return new PredefinedExpr(Loc, ResTy, IT); 425} 426 427Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 428 llvm::SmallString<16> CharBuffer; 429 CharBuffer.resize(Tok.getLength()); 430 const char *ThisTokBegin = &CharBuffer[0]; 431 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 432 433 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 434 Tok.getLocation(), PP); 435 if (Literal.hadError()) 436 return ExprResult(true); 437 438 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 439 440 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 441 Tok.getLocation()); 442} 443 444Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 445 // fast path for a single digit (which is quite common). A single digit 446 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 447 if (Tok.getLength() == 1) { 448 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 449 450 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 451 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 452 Context.IntTy, 453 Tok.getLocation())); 454 } 455 llvm::SmallString<512> IntegerBuffer; 456 IntegerBuffer.resize(Tok.getLength()); 457 const char *ThisTokBegin = &IntegerBuffer[0]; 458 459 // Get the spelling of the token, which eliminates trigraphs, etc. 460 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 461 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 462 Tok.getLocation(), PP); 463 if (Literal.hadError) 464 return ExprResult(true); 465 466 Expr *Res; 467 468 if (Literal.isFloatingLiteral()) { 469 QualType Ty; 470 if (Literal.isFloat) 471 Ty = Context.FloatTy; 472 else if (!Literal.isLong) 473 Ty = Context.DoubleTy; 474 else 475 Ty = Context.LongDoubleTy; 476 477 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 478 479 // isExact will be set by GetFloatValue(). 480 bool isExact = false; 481 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 482 Ty, Tok.getLocation()); 483 484 } else if (!Literal.isIntegerLiteral()) { 485 return ExprResult(true); 486 } else { 487 QualType Ty; 488 489 // long long is a C99 feature. 490 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 491 Literal.isLongLong) 492 Diag(Tok.getLocation(), diag::ext_longlong); 493 494 // Get the value in the widest-possible width. 495 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 496 497 if (Literal.GetIntegerValue(ResultVal)) { 498 // If this value didn't fit into uintmax_t, warn and force to ull. 499 Diag(Tok.getLocation(), diag::warn_integer_too_large); 500 Ty = Context.UnsignedLongLongTy; 501 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 502 "long long is not intmax_t?"); 503 } else { 504 // If this value fits into a ULL, try to figure out what else it fits into 505 // according to the rules of C99 6.4.4.1p5. 506 507 // Octal, Hexadecimal, and integers with a U suffix are allowed to 508 // be an unsigned int. 509 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 510 511 // Check from smallest to largest, picking the smallest type we can. 512 unsigned Width = 0; 513 if (!Literal.isLong && !Literal.isLongLong) { 514 // Are int/unsigned possibilities? 515 unsigned IntSize = Context.Target.getIntWidth(); 516 517 // Does it fit in a unsigned int? 518 if (ResultVal.isIntN(IntSize)) { 519 // Does it fit in a signed int? 520 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 521 Ty = Context.IntTy; 522 else if (AllowUnsigned) 523 Ty = Context.UnsignedIntTy; 524 Width = IntSize; 525 } 526 } 527 528 // Are long/unsigned long possibilities? 529 if (Ty.isNull() && !Literal.isLongLong) { 530 unsigned LongSize = Context.Target.getLongWidth(); 531 532 // Does it fit in a unsigned long? 533 if (ResultVal.isIntN(LongSize)) { 534 // Does it fit in a signed long? 535 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 536 Ty = Context.LongTy; 537 else if (AllowUnsigned) 538 Ty = Context.UnsignedLongTy; 539 Width = LongSize; 540 } 541 } 542 543 // Finally, check long long if needed. 544 if (Ty.isNull()) { 545 unsigned LongLongSize = Context.Target.getLongLongWidth(); 546 547 // Does it fit in a unsigned long long? 548 if (ResultVal.isIntN(LongLongSize)) { 549 // Does it fit in a signed long long? 550 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 551 Ty = Context.LongLongTy; 552 else if (AllowUnsigned) 553 Ty = Context.UnsignedLongLongTy; 554 Width = LongLongSize; 555 } 556 } 557 558 // If we still couldn't decide a type, we probably have something that 559 // does not fit in a signed long long, but has no U suffix. 560 if (Ty.isNull()) { 561 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 562 Ty = Context.UnsignedLongLongTy; 563 Width = Context.Target.getLongLongWidth(); 564 } 565 566 if (ResultVal.getBitWidth() != Width) 567 ResultVal.trunc(Width); 568 } 569 570 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 571 } 572 573 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 574 if (Literal.isImaginary) 575 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 576 577 return Res; 578} 579 580Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 581 ExprTy *Val) { 582 Expr *E = (Expr *)Val; 583 assert((E != 0) && "ActOnParenExpr() missing expr"); 584 return new ParenExpr(L, R, E); 585} 586 587/// The UsualUnaryConversions() function is *not* called by this routine. 588/// See C99 6.3.2.1p[2-4] for more details. 589QualType Sema::CheckSizeOfAlignOfOperand(QualType exprType, 590 SourceLocation OpLoc, 591 const SourceRange &ExprRange, 592 bool isSizeof) { 593 // C99 6.5.3.4p1: 594 if (isa<FunctionType>(exprType) && isSizeof) 595 // alignof(function) is allowed. 596 Diag(OpLoc, diag::ext_sizeof_function_type, ExprRange); 597 else if (exprType->isVoidType()) 598 Diag(OpLoc, diag::ext_sizeof_void_type, isSizeof ? "sizeof" : "__alignof", 599 ExprRange); 600 else if (exprType->isIncompleteType()) { 601 Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 602 diag::err_alignof_incomplete_type, 603 exprType.getAsString(), ExprRange); 604 return QualType(); // error 605 } 606 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 607 return Context.getSizeType(); 608} 609 610Action::ExprResult Sema:: 611ActOnSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, 612 SourceLocation LPLoc, TypeTy *Ty, 613 SourceLocation RPLoc) { 614 // If error parsing type, ignore. 615 if (Ty == 0) return true; 616 617 // Verify that this is a valid expression. 618 QualType ArgTy = QualType::getFromOpaquePtr(Ty); 619 620 QualType resultType = 621 CheckSizeOfAlignOfOperand(ArgTy, OpLoc, SourceRange(LPLoc, RPLoc),isSizeof); 622 623 if (resultType.isNull()) 624 return true; 625 return new SizeOfAlignOfTypeExpr(isSizeof, ArgTy, resultType, OpLoc, RPLoc); 626} 627 628QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 629 DefaultFunctionArrayConversion(V); 630 631 // These operators return the element type of a complex type. 632 if (const ComplexType *CT = V->getType()->getAsComplexType()) 633 return CT->getElementType(); 634 635 // Otherwise they pass through real integer and floating point types here. 636 if (V->getType()->isArithmeticType()) 637 return V->getType(); 638 639 // Reject anything else. 640 Diag(Loc, diag::err_realimag_invalid_type, V->getType().getAsString()); 641 return QualType(); 642} 643 644 645 646Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 647 tok::TokenKind Kind, 648 ExprTy *Input) { 649 UnaryOperator::Opcode Opc; 650 switch (Kind) { 651 default: assert(0 && "Unknown unary op!"); 652 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 653 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 654 } 655 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 656 if (result.isNull()) 657 return true; 658 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 659} 660 661Action::ExprResult Sema:: 662ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 663 ExprTy *Idx, SourceLocation RLoc) { 664 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 665 666 // Perform default conversions. 667 DefaultFunctionArrayConversion(LHSExp); 668 DefaultFunctionArrayConversion(RHSExp); 669 670 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 671 672 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 673 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 674 // in the subscript position. As a result, we need to derive the array base 675 // and index from the expression types. 676 Expr *BaseExpr, *IndexExpr; 677 QualType ResultType; 678 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 679 BaseExpr = LHSExp; 680 IndexExpr = RHSExp; 681 // FIXME: need to deal with const... 682 ResultType = PTy->getPointeeType(); 683 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 684 // Handle the uncommon case of "123[Ptr]". 685 BaseExpr = RHSExp; 686 IndexExpr = LHSExp; 687 // FIXME: need to deal with const... 688 ResultType = PTy->getPointeeType(); 689 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 690 BaseExpr = LHSExp; // vectors: V[123] 691 IndexExpr = RHSExp; 692 693 // Component access limited to variables (reject vec4.rg[1]). 694 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 695 !isa<ExtVectorElementExpr>(BaseExpr)) 696 return Diag(LLoc, diag::err_ext_vector_component_access, 697 SourceRange(LLoc, RLoc)); 698 // FIXME: need to deal with const... 699 ResultType = VTy->getElementType(); 700 } else { 701 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value, 702 RHSExp->getSourceRange()); 703 } 704 // C99 6.5.2.1p1 705 if (!IndexExpr->getType()->isIntegerType()) 706 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript, 707 IndexExpr->getSourceRange()); 708 709 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 710 // the following check catches trying to index a pointer to a function (e.g. 711 // void (*)(int)) and pointers to incomplete types. Functions are not 712 // objects in C99. 713 if (!ResultType->isObjectType()) 714 return Diag(BaseExpr->getLocStart(), 715 diag::err_typecheck_subscript_not_object, 716 BaseExpr->getType().getAsString(), BaseExpr->getSourceRange()); 717 718 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 719} 720 721QualType Sema:: 722CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 723 IdentifierInfo &CompName, SourceLocation CompLoc) { 724 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 725 726 // This flag determines whether or not the component is to be treated as a 727 // special name, or a regular GLSL-style component access. 728 bool SpecialComponent = false; 729 730 // The vector accessor can't exceed the number of elements. 731 const char *compStr = CompName.getName(); 732 if (strlen(compStr) > vecType->getNumElements()) { 733 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 734 baseType.getAsString(), SourceRange(CompLoc)); 735 return QualType(); 736 } 737 738 // Check that we've found one of the special components, or that the component 739 // names must come from the same set. 740 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 741 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 742 SpecialComponent = true; 743 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 744 do 745 compStr++; 746 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 747 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 748 do 749 compStr++; 750 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 751 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 752 do 753 compStr++; 754 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 755 } 756 757 if (!SpecialComponent && *compStr) { 758 // We didn't get to the end of the string. This means the component names 759 // didn't come from the same set *or* we encountered an illegal name. 760 Diag(OpLoc, diag::err_ext_vector_component_name_illegal, 761 std::string(compStr,compStr+1), SourceRange(CompLoc)); 762 return QualType(); 763 } 764 // Each component accessor can't exceed the vector type. 765 compStr = CompName.getName(); 766 while (*compStr) { 767 if (vecType->isAccessorWithinNumElements(*compStr)) 768 compStr++; 769 else 770 break; 771 } 772 if (!SpecialComponent && *compStr) { 773 // We didn't get to the end of the string. This means a component accessor 774 // exceeds the number of elements in the vector. 775 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 776 baseType.getAsString(), SourceRange(CompLoc)); 777 return QualType(); 778 } 779 780 // If we have a special component name, verify that the current vector length 781 // is an even number, since all special component names return exactly half 782 // the elements. 783 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 784 return QualType(); 785 } 786 787 // The component accessor looks fine - now we need to compute the actual type. 788 // The vector type is implied by the component accessor. For example, 789 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 790 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 791 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 792 : strlen(CompName.getName()); 793 if (CompSize == 1) 794 return vecType->getElementType(); 795 796 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 797 // Now look up the TypeDefDecl from the vector type. Without this, 798 // diagostics look bad. We want extended vector types to appear built-in. 799 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 800 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 801 return Context.getTypedefType(ExtVectorDecls[i]); 802 } 803 return VT; // should never get here (a typedef type should always be found). 804} 805 806/// constructSetterName - Return the setter name for the given 807/// identifier, i.e. "set" + Name where the initial character of Name 808/// has been capitalized. 809// FIXME: Merge with same routine in Parser. But where should this 810// live? 811static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 812 const IdentifierInfo *Name) { 813 unsigned N = Name->getLength(); 814 char *SelectorName = new char[3 + N]; 815 memcpy(SelectorName, "set", 3); 816 memcpy(&SelectorName[3], Name->getName(), N); 817 SelectorName[3] = toupper(SelectorName[3]); 818 819 IdentifierInfo *Setter = 820 &Idents.get(SelectorName, &SelectorName[3 + N]); 821 delete[] SelectorName; 822 return Setter; 823} 824 825Action::ExprResult Sema:: 826ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 827 tok::TokenKind OpKind, SourceLocation MemberLoc, 828 IdentifierInfo &Member) { 829 Expr *BaseExpr = static_cast<Expr *>(Base); 830 assert(BaseExpr && "no record expression"); 831 832 // Perform default conversions. 833 DefaultFunctionArrayConversion(BaseExpr); 834 835 QualType BaseType = BaseExpr->getType(); 836 assert(!BaseType.isNull() && "no type for member expression"); 837 838 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 839 // must have pointer type, and the accessed type is the pointee. 840 if (OpKind == tok::arrow) { 841 if (const PointerType *PT = BaseType->getAsPointerType()) 842 BaseType = PT->getPointeeType(); 843 else 844 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow, 845 BaseType.getAsString(), BaseExpr->getSourceRange()); 846 } 847 848 // Handle field access to simple records. This also handles access to fields 849 // of the ObjC 'id' struct. 850 if (const RecordType *RTy = BaseType->getAsRecordType()) { 851 RecordDecl *RDecl = RTy->getDecl(); 852 if (RTy->isIncompleteType()) 853 return Diag(OpLoc, diag::err_typecheck_incomplete_tag, RDecl->getName(), 854 BaseExpr->getSourceRange()); 855 // The record definition is complete, now make sure the member is valid. 856 FieldDecl *MemberDecl = RDecl->getMember(&Member); 857 if (!MemberDecl) 858 return Diag(MemberLoc, diag::err_typecheck_no_member, Member.getName(), 859 BaseExpr->getSourceRange()); 860 861 // Figure out the type of the member; see C99 6.5.2.3p3 862 // FIXME: Handle address space modifiers 863 QualType MemberType = MemberDecl->getType(); 864 unsigned combinedQualifiers = 865 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 866 MemberType = MemberType.getQualifiedType(combinedQualifiers); 867 868 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 869 MemberLoc, MemberType); 870 } 871 872 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 873 // (*Obj).ivar. 874 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 875 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) 876 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 877 OpKind == tok::arrow); 878 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar, 879 IFTy->getDecl()->getName(), Member.getName(), 880 BaseExpr->getSourceRange()); 881 } 882 883 // Handle Objective-C property access, which is "Obj.property" where Obj is a 884 // pointer to a (potentially qualified) interface type. 885 const PointerType *PTy; 886 const ObjCInterfaceType *IFTy; 887 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 888 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 889 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 890 891 // Search for a declared property first. 892 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 893 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 894 895 // Check protocols on qualified interfaces. 896 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 897 E = IFTy->qual_end(); I != E; ++I) 898 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 899 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 900 901 // If that failed, look for an "implicit" property by seeing if the nullary 902 // selector is implemented. 903 904 // FIXME: The logic for looking up nullary and unary selectors should be 905 // shared with the code in ActOnInstanceMessage. 906 907 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 908 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 909 910 // If this reference is in an @implementation, check for 'private' methods. 911 if (!Getter) 912 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 913 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 914 if (ObjCImplementationDecl *ImpDecl = 915 ObjCImplementations[ClassDecl->getIdentifier()]) 916 Getter = ImpDecl->getInstanceMethod(Sel); 917 918 if (Getter) { 919 // If we found a getter then this may be a valid dot-reference, we 920 // need to also look for the matching setter. 921 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 922 &Member); 923 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 924 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 925 926 if (!Setter) { 927 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 928 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 929 if (ObjCImplementationDecl *ImpDecl = 930 ObjCImplementations[ClassDecl->getIdentifier()]) 931 Setter = ImpDecl->getInstanceMethod(SetterSel); 932 } 933 934 // FIXME: There are some issues here. First, we are not 935 // diagnosing accesses to read-only properties because we do not 936 // know if this is a getter or setter yet. Second, we are 937 // checking that the type of the setter matches the type we 938 // expect. 939 return new ObjCPropertyRefExpr(Getter, Setter, Getter->getResultType(), 940 MemberLoc, BaseExpr); 941 } 942 } 943 944 // Handle 'field access' to vectors, such as 'V.xx'. 945 if (BaseType->isExtVectorType() && OpKind == tok::period) { 946 // Component access limited to variables (reject vec4.rg.g). 947 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 948 !isa<ExtVectorElementExpr>(BaseExpr)) 949 return Diag(MemberLoc, diag::err_ext_vector_component_access, 950 BaseExpr->getSourceRange()); 951 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 952 if (ret.isNull()) 953 return true; 954 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 955 } 956 957 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union, 958 BaseType.getAsString(), BaseExpr->getSourceRange()); 959} 960 961/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 962/// This provides the location of the left/right parens and a list of comma 963/// locations. 964Action::ExprResult Sema:: 965ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 966 ExprTy **args, unsigned NumArgs, 967 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 968 Expr *Fn = static_cast<Expr *>(fn); 969 Expr **Args = reinterpret_cast<Expr**>(args); 970 assert(Fn && "no function call expression"); 971 FunctionDecl *FDecl = NULL; 972 973 // Promote the function operand. 974 UsualUnaryConversions(Fn); 975 976 // If we're directly calling a function, get the declaration for 977 // that function. 978 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 979 if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr())) 980 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 981 982 // Make the call expr early, before semantic checks. This guarantees cleanup 983 // of arguments and function on error. 984 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 985 Context.BoolTy, RParenLoc)); 986 987 // C99 6.5.2.2p1 - "The expression that denotes the called function shall have 988 // type pointer to function". 989 const PointerType *PT = Fn->getType()->getAsPointerType(); 990 if (PT == 0) 991 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 992 Fn->getSourceRange()); 993 const FunctionType *FuncT = PT->getPointeeType()->getAsFunctionType(); 994 if (FuncT == 0) 995 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 996 Fn->getSourceRange()); 997 998 // We know the result type of the call, set it. 999 TheCall->setType(FuncT->getResultType()); 1000 1001 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1002 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1003 // assignment, to the types of the corresponding parameter, ... 1004 unsigned NumArgsInProto = Proto->getNumArgs(); 1005 unsigned NumArgsToCheck = NumArgs; 1006 1007 // If too few arguments are available (and we don't have default 1008 // arguments for the remaining parameters), don't make the call. 1009 if (NumArgs < NumArgsInProto) { 1010 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 1011 // Use default arguments for missing arguments 1012 NumArgsToCheck = NumArgsInProto; 1013 TheCall->setNumArgs(NumArgsInProto); 1014 } else 1015 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 1016 Fn->getSourceRange()); 1017 } 1018 1019 // If too many are passed and not variadic, error on the extras and drop 1020 // them. 1021 if (NumArgs > NumArgsInProto) { 1022 if (!Proto->isVariadic()) { 1023 Diag(Args[NumArgsInProto]->getLocStart(), 1024 diag::err_typecheck_call_too_many_args, Fn->getSourceRange(), 1025 SourceRange(Args[NumArgsInProto]->getLocStart(), 1026 Args[NumArgs-1]->getLocEnd())); 1027 // This deletes the extra arguments. 1028 TheCall->setNumArgs(NumArgsInProto); 1029 } 1030 NumArgsToCheck = NumArgsInProto; 1031 } 1032 1033 // Continue to check argument types (even if we have too few/many args). 1034 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1035 QualType ProtoArgType = Proto->getArgType(i); 1036 1037 Expr *Arg; 1038 if (i < NumArgs) 1039 Arg = Args[i]; 1040 else 1041 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1042 QualType ArgType = Arg->getType(); 1043 1044 // Compute implicit casts from the operand to the formal argument type. 1045 AssignConvertType ConvTy = 1046 CheckSingleAssignmentConstraints(ProtoArgType, Arg); 1047 TheCall->setArg(i, Arg); 1048 1049 if (DiagnoseAssignmentResult(ConvTy, Arg->getLocStart(), ProtoArgType, 1050 ArgType, Arg, "passing")) 1051 return true; 1052 } 1053 1054 // If this is a variadic call, handle args passed through "...". 1055 if (Proto->isVariadic()) { 1056 // Promote the arguments (C99 6.5.2.2p7). 1057 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1058 Expr *Arg = Args[i]; 1059 DefaultArgumentPromotion(Arg); 1060 TheCall->setArg(i, Arg); 1061 } 1062 } 1063 } else { 1064 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1065 1066 // Promote the arguments (C99 6.5.2.2p6). 1067 for (unsigned i = 0; i != NumArgs; i++) { 1068 Expr *Arg = Args[i]; 1069 DefaultArgumentPromotion(Arg); 1070 TheCall->setArg(i, Arg); 1071 } 1072 } 1073 1074 // Do special checking on direct calls to functions. 1075 if (FDecl) 1076 return CheckFunctionCall(FDecl, TheCall.take()); 1077 1078 return TheCall.take(); 1079} 1080 1081Action::ExprResult Sema:: 1082ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1083 SourceLocation RParenLoc, ExprTy *InitExpr) { 1084 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1085 QualType literalType = QualType::getFromOpaquePtr(Ty); 1086 // FIXME: put back this assert when initializers are worked out. 1087 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1088 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1089 1090 if (literalType->isArrayType()) { 1091 if (literalType->isVariableArrayType()) 1092 return Diag(LParenLoc, 1093 diag::err_variable_object_no_init, 1094 SourceRange(LParenLoc, 1095 literalExpr->getSourceRange().getEnd())); 1096 } else if (literalType->isIncompleteType()) { 1097 return Diag(LParenLoc, 1098 diag::err_typecheck_decl_incomplete_type, 1099 literalType.getAsString(), 1100 SourceRange(LParenLoc, 1101 literalExpr->getSourceRange().getEnd())); 1102 } 1103 1104 if (CheckInitializerTypes(literalExpr, literalType)) 1105 return true; 1106 1107 bool isFileScope = !getCurFunctionDecl() && !getCurMethodDecl(); 1108 if (isFileScope) { // 6.5.2.5p3 1109 if (CheckForConstantInitializer(literalExpr, literalType)) 1110 return true; 1111 } 1112 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, isFileScope); 1113} 1114 1115Action::ExprResult Sema:: 1116ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1117 SourceLocation RBraceLoc) { 1118 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1119 1120 // Semantic analysis for initializers is done by ActOnDeclarator() and 1121 // CheckInitializer() - it requires knowledge of the object being intialized. 1122 1123 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc); 1124 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1125 return E; 1126} 1127 1128/// CheckCastTypes - Check type constraints for casting between types. 1129bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1130 UsualUnaryConversions(castExpr); 1131 1132 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1133 // type needs to be scalar. 1134 if (castType->isVoidType()) { 1135 // Cast to void allows any expr type. 1136 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1137 // GCC struct/union extension: allow cast to self. 1138 if (Context.getCanonicalType(castType) != 1139 Context.getCanonicalType(castExpr->getType()) || 1140 (!castType->isStructureType() && !castType->isUnionType())) { 1141 // Reject any other conversions to non-scalar types. 1142 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar, 1143 castType.getAsString(), castExpr->getSourceRange()); 1144 } 1145 1146 // accept this, but emit an ext-warn. 1147 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar, 1148 castType.getAsString(), castExpr->getSourceRange()); 1149 } else if (!castExpr->getType()->isScalarType() && 1150 !castExpr->getType()->isVectorType()) { 1151 return Diag(castExpr->getLocStart(), 1152 diag::err_typecheck_expect_scalar_operand, 1153 castExpr->getType().getAsString(),castExpr->getSourceRange()); 1154 } else if (castExpr->getType()->isVectorType()) { 1155 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1156 return true; 1157 } else if (castType->isVectorType()) { 1158 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1159 return true; 1160 } 1161 return false; 1162} 1163 1164bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1165 assert(VectorTy->isVectorType() && "Not a vector type!"); 1166 1167 if (Ty->isVectorType() || Ty->isIntegerType()) { 1168 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1169 return Diag(R.getBegin(), 1170 Ty->isVectorType() ? 1171 diag::err_invalid_conversion_between_vectors : 1172 diag::err_invalid_conversion_between_vector_and_integer, 1173 VectorTy.getAsString().c_str(), 1174 Ty.getAsString().c_str(), R); 1175 } else 1176 return Diag(R.getBegin(), 1177 diag::err_invalid_conversion_between_vector_and_scalar, 1178 VectorTy.getAsString().c_str(), 1179 Ty.getAsString().c_str(), R); 1180 1181 return false; 1182} 1183 1184Action::ExprResult Sema:: 1185ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1186 SourceLocation RParenLoc, ExprTy *Op) { 1187 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1188 1189 Expr *castExpr = static_cast<Expr*>(Op); 1190 QualType castType = QualType::getFromOpaquePtr(Ty); 1191 1192 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1193 return true; 1194 return new ExplicitCastExpr(castType, castExpr, LParenLoc); 1195} 1196 1197/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1198/// In that case, lex = cond. 1199inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1200 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1201 UsualUnaryConversions(cond); 1202 UsualUnaryConversions(lex); 1203 UsualUnaryConversions(rex); 1204 QualType condT = cond->getType(); 1205 QualType lexT = lex->getType(); 1206 QualType rexT = rex->getType(); 1207 1208 // first, check the condition. 1209 if (!condT->isScalarType()) { // C99 6.5.15p2 1210 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 1211 condT.getAsString()); 1212 return QualType(); 1213 } 1214 1215 // Now check the two expressions. 1216 1217 // If both operands have arithmetic type, do the usual arithmetic conversions 1218 // to find a common type: C99 6.5.15p3,5. 1219 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1220 UsualArithmeticConversions(lex, rex); 1221 return lex->getType(); 1222 } 1223 1224 // If both operands are the same structure or union type, the result is that 1225 // type. 1226 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1227 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1228 if (LHSRT->getDecl() == RHSRT->getDecl()) 1229 // "If both the operands have structure or union type, the result has 1230 // that type." This implies that CV qualifiers are dropped. 1231 return lexT.getUnqualifiedType(); 1232 } 1233 1234 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1235 // The following || allows only one side to be void (a GCC-ism). 1236 if (lexT->isVoidType() || rexT->isVoidType()) { 1237 if (!lexT->isVoidType()) 1238 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 1239 rex->getSourceRange()); 1240 if (!rexT->isVoidType()) 1241 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 1242 lex->getSourceRange()); 1243 ImpCastExprToType(lex, Context.VoidTy); 1244 ImpCastExprToType(rex, Context.VoidTy); 1245 return Context.VoidTy; 1246 } 1247 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1248 // the type of the other operand." 1249 if (lexT->isPointerType() && rex->isNullPointerConstant(Context)) { 1250 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1251 return lexT; 1252 } 1253 if (rexT->isPointerType() && lex->isNullPointerConstant(Context)) { 1254 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1255 return rexT; 1256 } 1257 // Allow any Objective-C types to devolve to id type. 1258 // FIXME: This seems to match gcc behavior, although that is very 1259 // arguably incorrect. For example, (xxx ? (id<P>) : (id<P>)) has 1260 // type id, which seems broken. 1261 if (Context.isObjCObjectPointerType(lexT) && 1262 Context.isObjCObjectPointerType(rexT)) { 1263 // FIXME: This is not the correct composite type. This only 1264 // happens to work because id can more or less be used anywhere, 1265 // however this may change the type of method sends. 1266 // FIXME: gcc adds some type-checking of the arguments and emits 1267 // (confusing) incompatible comparison warnings in some 1268 // cases. Investigate. 1269 QualType compositeType = Context.getObjCIdType(); 1270 ImpCastExprToType(lex, compositeType); 1271 ImpCastExprToType(rex, compositeType); 1272 return compositeType; 1273 } 1274 // Handle the case where both operands are pointers before we handle null 1275 // pointer constants in case both operands are null pointer constants. 1276 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1277 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1278 // get the "pointed to" types 1279 QualType lhptee = LHSPT->getPointeeType(); 1280 QualType rhptee = RHSPT->getPointeeType(); 1281 1282 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1283 if (lhptee->isVoidType() && 1284 rhptee->isIncompleteOrObjectType()) { 1285 // Figure out necessary qualifiers (C99 6.5.15p6) 1286 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1287 QualType destType = Context.getPointerType(destPointee); 1288 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1289 ImpCastExprToType(rex, destType); // promote to void* 1290 return destType; 1291 } 1292 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1293 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1294 QualType destType = Context.getPointerType(destPointee); 1295 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1296 ImpCastExprToType(rex, destType); // promote to void* 1297 return destType; 1298 } 1299 1300 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1301 rhptee.getUnqualifiedType())) { 1302 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 1303 lexT.getAsString(), rexT.getAsString(), 1304 lex->getSourceRange(), rex->getSourceRange()); 1305 // In this situation, assume a conservative type; in general 1306 // we assume void* type. No especially good reason, but this 1307 // is what gcc does, and we do have to pick to get a 1308 // consistent AST. However, if either type is an Objective-C 1309 // object type then use id. 1310 QualType incompatTy; 1311 if (Context.isObjCObjectPointerType(lexT) || 1312 Context.isObjCObjectPointerType(rexT)) { 1313 incompatTy = Context.getObjCIdType(); 1314 } else { 1315 incompatTy = Context.getPointerType(Context.VoidTy); 1316 } 1317 ImpCastExprToType(lex, incompatTy); 1318 ImpCastExprToType(rex, incompatTy); 1319 return incompatTy; 1320 } 1321 // The pointer types are compatible. 1322 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1323 // differently qualified versions of compatible types, the result type is 1324 // a pointer to an appropriately qualified version of the *composite* 1325 // type. 1326 // FIXME: Need to calculate the composite type. 1327 // FIXME: Need to add qualifiers 1328 QualType compositeType = lexT; 1329 ImpCastExprToType(lex, compositeType); 1330 ImpCastExprToType(rex, compositeType); 1331 return compositeType; 1332 } 1333 } 1334 // Otherwise, the operands are not compatible. 1335 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 1336 lexT.getAsString(), rexT.getAsString(), 1337 lex->getSourceRange(), rex->getSourceRange()); 1338 return QualType(); 1339} 1340 1341/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1342/// in the case of a the GNU conditional expr extension. 1343Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1344 SourceLocation ColonLoc, 1345 ExprTy *Cond, ExprTy *LHS, 1346 ExprTy *RHS) { 1347 Expr *CondExpr = (Expr *) Cond; 1348 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1349 1350 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1351 // was the condition. 1352 bool isLHSNull = LHSExpr == 0; 1353 if (isLHSNull) 1354 LHSExpr = CondExpr; 1355 1356 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1357 RHSExpr, QuestionLoc); 1358 if (result.isNull()) 1359 return true; 1360 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1361 RHSExpr, result); 1362} 1363 1364 1365// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1366// being closely modeled after the C99 spec:-). The odd characteristic of this 1367// routine is it effectively iqnores the qualifiers on the top level pointee. 1368// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1369// FIXME: add a couple examples in this comment. 1370Sema::AssignConvertType 1371Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1372 QualType lhptee, rhptee; 1373 1374 // get the "pointed to" type (ignoring qualifiers at the top level) 1375 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1376 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1377 1378 // make sure we operate on the canonical type 1379 lhptee = Context.getCanonicalType(lhptee); 1380 rhptee = Context.getCanonicalType(rhptee); 1381 1382 AssignConvertType ConvTy = Compatible; 1383 1384 // C99 6.5.16.1p1: This following citation is common to constraints 1385 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1386 // qualifiers of the type *pointed to* by the right; 1387 // FIXME: Handle ASQualType 1388 if ((lhptee.getCVRQualifiers() & rhptee.getCVRQualifiers()) != 1389 rhptee.getCVRQualifiers()) 1390 ConvTy = CompatiblePointerDiscardsQualifiers; 1391 1392 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1393 // incomplete type and the other is a pointer to a qualified or unqualified 1394 // version of void... 1395 if (lhptee->isVoidType()) { 1396 if (rhptee->isIncompleteOrObjectType()) 1397 return ConvTy; 1398 1399 // As an extension, we allow cast to/from void* to function pointer. 1400 assert(rhptee->isFunctionType()); 1401 return FunctionVoidPointer; 1402 } 1403 1404 if (rhptee->isVoidType()) { 1405 if (lhptee->isIncompleteOrObjectType()) 1406 return ConvTy; 1407 1408 // As an extension, we allow cast to/from void* to function pointer. 1409 assert(lhptee->isFunctionType()); 1410 return FunctionVoidPointer; 1411 } 1412 1413 // Check for ObjC interfaces 1414 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1415 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1416 if (LHSIface && RHSIface && 1417 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1418 return ConvTy; 1419 1420 // ID acts sort of like void* for ObjC interfaces 1421 if (LHSIface && Context.isObjCIdType(rhptee)) 1422 return ConvTy; 1423 if (RHSIface && Context.isObjCIdType(lhptee)) 1424 return ConvTy; 1425 1426 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1427 // unqualified versions of compatible types, ... 1428 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1429 rhptee.getUnqualifiedType())) 1430 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1431 return ConvTy; 1432} 1433 1434/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1435/// block pointer types are compatible or whether a block and normal pointer 1436/// are compatible. It is more restrict than comparing two function pointer 1437// types. 1438Sema::AssignConvertType 1439Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1440 QualType rhsType) { 1441 QualType lhptee, rhptee; 1442 1443 // get the "pointed to" type (ignoring qualifiers at the top level) 1444 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1445 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1446 1447 // make sure we operate on the canonical type 1448 lhptee = Context.getCanonicalType(lhptee); 1449 rhptee = Context.getCanonicalType(rhptee); 1450 1451 AssignConvertType ConvTy = Compatible; 1452 1453 // For blocks we enforce that qualifiers are identical. 1454 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1455 ConvTy = CompatiblePointerDiscardsQualifiers; 1456 1457 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1458 return IncompatibleBlockPointer; 1459 return ConvTy; 1460} 1461 1462/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1463/// has code to accommodate several GCC extensions when type checking 1464/// pointers. Here are some objectionable examples that GCC considers warnings: 1465/// 1466/// int a, *pint; 1467/// short *pshort; 1468/// struct foo *pfoo; 1469/// 1470/// pint = pshort; // warning: assignment from incompatible pointer type 1471/// a = pint; // warning: assignment makes integer from pointer without a cast 1472/// pint = a; // warning: assignment makes pointer from integer without a cast 1473/// pint = pfoo; // warning: assignment from incompatible pointer type 1474/// 1475/// As a result, the code for dealing with pointers is more complex than the 1476/// C99 spec dictates. 1477/// 1478Sema::AssignConvertType 1479Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1480 // Get canonical types. We're not formatting these types, just comparing 1481 // them. 1482 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1483 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1484 1485 if (lhsType == rhsType) 1486 return Compatible; // Common case: fast path an exact match. 1487 1488 if (lhsType->isReferenceType() || rhsType->isReferenceType()) { 1489 if (Context.typesAreCompatible(lhsType, rhsType)) 1490 return Compatible; 1491 return Incompatible; 1492 } 1493 1494 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1495 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1496 return Compatible; 1497 // Relax integer conversions like we do for pointers below. 1498 if (rhsType->isIntegerType()) 1499 return IntToPointer; 1500 if (lhsType->isIntegerType()) 1501 return PointerToInt; 1502 return Incompatible; 1503 } 1504 1505 if (lhsType->isVectorType() || rhsType->isVectorType()) { 1506 // For ExtVector, allow vector splats; float -> <n x float> 1507 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 1508 if (LV->getElementType() == rhsType) 1509 return Compatible; 1510 1511 // If we are allowing lax vector conversions, and LHS and RHS are both 1512 // vectors, the total size only needs to be the same. This is a bitcast; 1513 // no bits are changed but the result type is different. 1514 if (getLangOptions().LaxVectorConversions && 1515 lhsType->isVectorType() && rhsType->isVectorType()) { 1516 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1517 return Compatible; 1518 } 1519 return Incompatible; 1520 } 1521 1522 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1523 return Compatible; 1524 1525 if (isa<PointerType>(lhsType)) { 1526 if (rhsType->isIntegerType()) 1527 return IntToPointer; 1528 1529 if (isa<PointerType>(rhsType)) 1530 return CheckPointerTypesForAssignment(lhsType, rhsType); 1531 1532 if (const BlockPointerType *BPT = rhsType->getAsBlockPointerType()) 1533 if (BPT->getPointeeType()->isVoidType()) 1534 return BlockVoidPointer; 1535 1536 return Incompatible; 1537 } 1538 1539 if (isa<BlockPointerType>(lhsType)) { 1540 if (rhsType->isIntegerType()) 1541 return IntToPointer; 1542 1543 if (rhsType->isBlockPointerType()) 1544 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 1545 1546 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 1547 if (RHSPT->getPointeeType()->isVoidType()) 1548 return BlockVoidPointer; 1549 } 1550 return Incompatible; 1551 } 1552 1553 if (isa<PointerType>(rhsType)) { 1554 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1555 if (lhsType == Context.BoolTy) 1556 return Compatible; 1557 1558 if (lhsType->isIntegerType()) 1559 return PointerToInt; 1560 1561 if (isa<PointerType>(lhsType)) 1562 return CheckPointerTypesForAssignment(lhsType, rhsType); 1563 1564 if (isa<BlockPointerType>(lhsType) && 1565 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1566 return BlockVoidPointer; 1567 return Incompatible; 1568 } 1569 1570 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1571 if (Context.typesAreCompatible(lhsType, rhsType)) 1572 return Compatible; 1573 } 1574 return Incompatible; 1575} 1576 1577Sema::AssignConvertType 1578Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1579 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1580 // a null pointer constant. 1581 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType()) 1582 && rExpr->isNullPointerConstant(Context)) { 1583 ImpCastExprToType(rExpr, lhsType); 1584 return Compatible; 1585 } 1586 1587 // We don't allow conversion of non-null-pointer constants to integers. 1588 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 1589 return IntToBlockPointer; 1590 1591 // This check seems unnatural, however it is necessary to ensure the proper 1592 // conversion of functions/arrays. If the conversion were done for all 1593 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1594 // expressions that surpress this implicit conversion (&, sizeof). 1595 // 1596 // Suppress this for references: C99 8.5.3p5. FIXME: revisit when references 1597 // are better understood. 1598 if (!lhsType->isReferenceType()) 1599 DefaultFunctionArrayConversion(rExpr); 1600 1601 Sema::AssignConvertType result = 1602 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1603 1604 // C99 6.5.16.1p2: The value of the right operand is converted to the 1605 // type of the assignment expression. 1606 if (rExpr->getType() != lhsType) 1607 ImpCastExprToType(rExpr, lhsType); 1608 return result; 1609} 1610 1611Sema::AssignConvertType 1612Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1613 return CheckAssignmentConstraints(lhsType, rhsType); 1614} 1615 1616QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1617 Diag(loc, diag::err_typecheck_invalid_operands, 1618 lex->getType().getAsString(), rex->getType().getAsString(), 1619 lex->getSourceRange(), rex->getSourceRange()); 1620 return QualType(); 1621} 1622 1623inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1624 Expr *&rex) { 1625 // For conversion purposes, we ignore any qualifiers. 1626 // For example, "const float" and "float" are equivalent. 1627 QualType lhsType = 1628 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 1629 QualType rhsType = 1630 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 1631 1632 // If the vector types are identical, return. 1633 if (lhsType == rhsType) 1634 return lhsType; 1635 1636 // Handle the case of a vector & extvector type of the same size and element 1637 // type. It would be nice if we only had one vector type someday. 1638 if (getLangOptions().LaxVectorConversions) 1639 if (const VectorType *LV = lhsType->getAsVectorType()) 1640 if (const VectorType *RV = rhsType->getAsVectorType()) 1641 if (LV->getElementType() == RV->getElementType() && 1642 LV->getNumElements() == RV->getNumElements()) 1643 return lhsType->isExtVectorType() ? lhsType : rhsType; 1644 1645 // If the lhs is an extended vector and the rhs is a scalar of the same type 1646 // or a literal, promote the rhs to the vector type. 1647 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1648 QualType eltType = V->getElementType(); 1649 1650 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 1651 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 1652 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 1653 ImpCastExprToType(rex, lhsType); 1654 return lhsType; 1655 } 1656 } 1657 1658 // If the rhs is an extended vector and the lhs is a scalar of the same type, 1659 // promote the lhs to the vector type. 1660 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1661 QualType eltType = V->getElementType(); 1662 1663 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 1664 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 1665 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 1666 ImpCastExprToType(lex, rhsType); 1667 return rhsType; 1668 } 1669 } 1670 1671 // You cannot convert between vector values of different size. 1672 Diag(loc, diag::err_typecheck_vector_not_convertable, 1673 lex->getType().getAsString(), rex->getType().getAsString(), 1674 lex->getSourceRange(), rex->getSourceRange()); 1675 return QualType(); 1676} 1677 1678inline QualType Sema::CheckMultiplyDivideOperands( 1679 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1680{ 1681 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1682 1683 if (lhsType->isVectorType() || rhsType->isVectorType()) 1684 return CheckVectorOperands(loc, lex, rex); 1685 1686 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1687 1688 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1689 return compType; 1690 return InvalidOperands(loc, lex, rex); 1691} 1692 1693inline QualType Sema::CheckRemainderOperands( 1694 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1695{ 1696 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1697 1698 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1699 1700 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1701 return compType; 1702 return InvalidOperands(loc, lex, rex); 1703} 1704 1705inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1706 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1707{ 1708 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1709 return CheckVectorOperands(loc, lex, rex); 1710 1711 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1712 1713 // handle the common case first (both operands are arithmetic). 1714 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1715 return compType; 1716 1717 // Put any potential pointer into PExp 1718 Expr* PExp = lex, *IExp = rex; 1719 if (IExp->getType()->isPointerType()) 1720 std::swap(PExp, IExp); 1721 1722 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1723 if (IExp->getType()->isIntegerType()) { 1724 // Check for arithmetic on pointers to incomplete types 1725 if (!PTy->getPointeeType()->isObjectType()) { 1726 if (PTy->getPointeeType()->isVoidType()) { 1727 Diag(loc, diag::ext_gnu_void_ptr, 1728 lex->getSourceRange(), rex->getSourceRange()); 1729 } else { 1730 Diag(loc, diag::err_typecheck_arithmetic_incomplete_type, 1731 lex->getType().getAsString(), lex->getSourceRange()); 1732 return QualType(); 1733 } 1734 } 1735 return PExp->getType(); 1736 } 1737 } 1738 1739 return InvalidOperands(loc, lex, rex); 1740} 1741 1742// C99 6.5.6 1743QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1744 SourceLocation loc, bool isCompAssign) { 1745 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1746 return CheckVectorOperands(loc, lex, rex); 1747 1748 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1749 1750 // Enforce type constraints: C99 6.5.6p3. 1751 1752 // Handle the common case first (both operands are arithmetic). 1753 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1754 return compType; 1755 1756 // Either ptr - int or ptr - ptr. 1757 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1758 QualType lpointee = LHSPTy->getPointeeType(); 1759 1760 // The LHS must be an object type, not incomplete, function, etc. 1761 if (!lpointee->isObjectType()) { 1762 // Handle the GNU void* extension. 1763 if (lpointee->isVoidType()) { 1764 Diag(loc, diag::ext_gnu_void_ptr, 1765 lex->getSourceRange(), rex->getSourceRange()); 1766 } else { 1767 Diag(loc, diag::err_typecheck_sub_ptr_object, 1768 lex->getType().getAsString(), lex->getSourceRange()); 1769 return QualType(); 1770 } 1771 } 1772 1773 // The result type of a pointer-int computation is the pointer type. 1774 if (rex->getType()->isIntegerType()) 1775 return lex->getType(); 1776 1777 // Handle pointer-pointer subtractions. 1778 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 1779 QualType rpointee = RHSPTy->getPointeeType(); 1780 1781 // RHS must be an object type, unless void (GNU). 1782 if (!rpointee->isObjectType()) { 1783 // Handle the GNU void* extension. 1784 if (rpointee->isVoidType()) { 1785 if (!lpointee->isVoidType()) 1786 Diag(loc, diag::ext_gnu_void_ptr, 1787 lex->getSourceRange(), rex->getSourceRange()); 1788 } else { 1789 Diag(loc, diag::err_typecheck_sub_ptr_object, 1790 rex->getType().getAsString(), rex->getSourceRange()); 1791 return QualType(); 1792 } 1793 } 1794 1795 // Pointee types must be compatible. 1796 if (!Context.typesAreCompatible( 1797 Context.getCanonicalType(lpointee).getUnqualifiedType(), 1798 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 1799 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 1800 lex->getType().getAsString(), rex->getType().getAsString(), 1801 lex->getSourceRange(), rex->getSourceRange()); 1802 return QualType(); 1803 } 1804 1805 return Context.getPointerDiffType(); 1806 } 1807 } 1808 1809 return InvalidOperands(loc, lex, rex); 1810} 1811 1812// C99 6.5.7 1813QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1814 bool isCompAssign) { 1815 // C99 6.5.7p2: Each of the operands shall have integer type. 1816 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 1817 return InvalidOperands(loc, lex, rex); 1818 1819 // Shifts don't perform usual arithmetic conversions, they just do integer 1820 // promotions on each operand. C99 6.5.7p3 1821 if (!isCompAssign) 1822 UsualUnaryConversions(lex); 1823 UsualUnaryConversions(rex); 1824 1825 // "The type of the result is that of the promoted left operand." 1826 return lex->getType(); 1827} 1828 1829static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 1830 ASTContext& Context) { 1831 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 1832 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 1833 // ID acts sort of like void* for ObjC interfaces 1834 if (LHSIface && Context.isObjCIdType(RHS)) 1835 return true; 1836 if (RHSIface && Context.isObjCIdType(LHS)) 1837 return true; 1838 if (!LHSIface || !RHSIface) 1839 return false; 1840 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 1841 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 1842} 1843 1844// C99 6.5.8 1845QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1846 bool isRelational) { 1847 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1848 return CheckVectorCompareOperands(lex, rex, loc, isRelational); 1849 1850 // C99 6.5.8p3 / C99 6.5.9p4 1851 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1852 UsualArithmeticConversions(lex, rex); 1853 else { 1854 UsualUnaryConversions(lex); 1855 UsualUnaryConversions(rex); 1856 } 1857 QualType lType = lex->getType(); 1858 QualType rType = rex->getType(); 1859 1860 // For non-floating point types, check for self-comparisons of the form 1861 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 1862 // often indicate logic errors in the program. 1863 if (!lType->isFloatingType()) { 1864 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 1865 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 1866 if (DRL->getDecl() == DRR->getDecl()) 1867 Diag(loc, diag::warn_selfcomparison); 1868 } 1869 1870 if (isRelational) { 1871 if (lType->isRealType() && rType->isRealType()) 1872 return Context.IntTy; 1873 } else { 1874 // Check for comparisons of floating point operands using != and ==. 1875 if (lType->isFloatingType()) { 1876 assert (rType->isFloatingType()); 1877 CheckFloatComparison(loc,lex,rex); 1878 } 1879 1880 if (lType->isArithmeticType() && rType->isArithmeticType()) 1881 return Context.IntTy; 1882 } 1883 1884 bool LHSIsNull = lex->isNullPointerConstant(Context); 1885 bool RHSIsNull = rex->isNullPointerConstant(Context); 1886 1887 // All of the following pointer related warnings are GCC extensions, except 1888 // when handling null pointer constants. One day, we can consider making them 1889 // errors (when -pedantic-errors is enabled). 1890 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 1891 QualType LCanPointeeTy = 1892 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 1893 QualType RCanPointeeTy = 1894 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 1895 1896 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 1897 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 1898 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 1899 RCanPointeeTy.getUnqualifiedType()) && 1900 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 1901 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 1902 lType.getAsString(), rType.getAsString(), 1903 lex->getSourceRange(), rex->getSourceRange()); 1904 } 1905 ImpCastExprToType(rex, lType); // promote the pointer to pointer 1906 return Context.IntTy; 1907 } 1908 // Handle block pointer types. 1909 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 1910 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 1911 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 1912 1913 if (!LHSIsNull && !RHSIsNull && 1914 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 1915 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 1916 lType.getAsString(), rType.getAsString(), 1917 lex->getSourceRange(), rex->getSourceRange()); 1918 } 1919 ImpCastExprToType(rex, lType); // promote the pointer to pointer 1920 return Context.IntTy; 1921 } 1922 1923 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 1924 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 1925 ImpCastExprToType(rex, lType); 1926 return Context.IntTy; 1927 } 1928 } 1929 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 1930 rType->isIntegerType()) { 1931 if (!RHSIsNull) 1932 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 1933 lType.getAsString(), rType.getAsString(), 1934 lex->getSourceRange(), rex->getSourceRange()); 1935 ImpCastExprToType(rex, lType); // promote the integer to pointer 1936 return Context.IntTy; 1937 } 1938 if (lType->isIntegerType() && 1939 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 1940 if (!LHSIsNull) 1941 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 1942 lType.getAsString(), rType.getAsString(), 1943 lex->getSourceRange(), rex->getSourceRange()); 1944 ImpCastExprToType(lex, rType); // promote the integer to pointer 1945 return Context.IntTy; 1946 } 1947 return InvalidOperands(loc, lex, rex); 1948} 1949 1950/// CheckVectorCompareOperands - vector comparisons are a clang extension that 1951/// operates on extended vector types. Instead of producing an IntTy result, 1952/// like a scalar comparison, a vector comparison produces a vector of integer 1953/// types. 1954QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 1955 SourceLocation loc, 1956 bool isRelational) { 1957 // Check to make sure we're operating on vectors of the same type and width, 1958 // Allowing one side to be a scalar of element type. 1959 QualType vType = CheckVectorOperands(loc, lex, rex); 1960 if (vType.isNull()) 1961 return vType; 1962 1963 QualType lType = lex->getType(); 1964 QualType rType = rex->getType(); 1965 1966 // For non-floating point types, check for self-comparisons of the form 1967 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 1968 // often indicate logic errors in the program. 1969 if (!lType->isFloatingType()) { 1970 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 1971 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 1972 if (DRL->getDecl() == DRR->getDecl()) 1973 Diag(loc, diag::warn_selfcomparison); 1974 } 1975 1976 // Check for comparisons of floating point operands using != and ==. 1977 if (!isRelational && lType->isFloatingType()) { 1978 assert (rType->isFloatingType()); 1979 CheckFloatComparison(loc,lex,rex); 1980 } 1981 1982 // Return the type for the comparison, which is the same as vector type for 1983 // integer vectors, or an integer type of identical size and number of 1984 // elements for floating point vectors. 1985 if (lType->isIntegerType()) 1986 return lType; 1987 1988 const VectorType *VTy = lType->getAsVectorType(); 1989 1990 // FIXME: need to deal with non-32b int / non-64b long long 1991 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 1992 if (TypeSize == 32) { 1993 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 1994 } 1995 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 1996 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 1997} 1998 1999inline QualType Sema::CheckBitwiseOperands( 2000 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 2001{ 2002 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2003 return CheckVectorOperands(loc, lex, rex); 2004 2005 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2006 2007 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2008 return compType; 2009 return InvalidOperands(loc, lex, rex); 2010} 2011 2012inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2013 Expr *&lex, Expr *&rex, SourceLocation loc) 2014{ 2015 UsualUnaryConversions(lex); 2016 UsualUnaryConversions(rex); 2017 2018 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2019 return Context.IntTy; 2020 return InvalidOperands(loc, lex, rex); 2021} 2022 2023inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 2024 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 2025{ 2026 QualType lhsType = lex->getType(); 2027 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 2028 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(Context); 2029 2030 switch (mlval) { // C99 6.5.16p2 2031 case Expr::MLV_Valid: 2032 break; 2033 case Expr::MLV_ConstQualified: 2034 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 2035 return QualType(); 2036 case Expr::MLV_ArrayType: 2037 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 2038 lhsType.getAsString(), lex->getSourceRange()); 2039 return QualType(); 2040 case Expr::MLV_NotObjectType: 2041 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 2042 lhsType.getAsString(), lex->getSourceRange()); 2043 return QualType(); 2044 case Expr::MLV_InvalidExpression: 2045 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 2046 lex->getSourceRange()); 2047 return QualType(); 2048 case Expr::MLV_IncompleteType: 2049 case Expr::MLV_IncompleteVoidType: 2050 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 2051 lhsType.getAsString(), lex->getSourceRange()); 2052 return QualType(); 2053 case Expr::MLV_DuplicateVectorComponents: 2054 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 2055 lex->getSourceRange()); 2056 return QualType(); 2057 } 2058 2059 AssignConvertType ConvTy; 2060 if (compoundType.isNull()) { 2061 // Simple assignment "x = y". 2062 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 2063 2064 // If the RHS is a unary plus or minus, check to see if they = and + are 2065 // right next to each other. If so, the user may have typo'd "x =+ 4" 2066 // instead of "x += 4". 2067 Expr *RHSCheck = rex; 2068 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2069 RHSCheck = ICE->getSubExpr(); 2070 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2071 if ((UO->getOpcode() == UnaryOperator::Plus || 2072 UO->getOpcode() == UnaryOperator::Minus) && 2073 loc.isFileID() && UO->getOperatorLoc().isFileID() && 2074 // Only if the two operators are exactly adjacent. 2075 loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2076 Diag(loc, diag::warn_not_compound_assign, 2077 UO->getOpcode() == UnaryOperator::Plus ? "+" : "-", 2078 SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc())); 2079 } 2080 } else { 2081 // Compound assignment "x += y" 2082 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 2083 } 2084 2085 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 2086 rex, "assigning")) 2087 return QualType(); 2088 2089 // C99 6.5.16p3: The type of an assignment expression is the type of the 2090 // left operand unless the left operand has qualified type, in which case 2091 // it is the unqualified version of the type of the left operand. 2092 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2093 // is converted to the type of the assignment expression (above). 2094 // C++ 5.17p1: the type of the assignment expression is that of its left 2095 // oprdu. 2096 return lhsType.getUnqualifiedType(); 2097} 2098 2099inline QualType Sema::CheckCommaOperands( // C99 6.5.17 2100 Expr *&lex, Expr *&rex, SourceLocation loc) { 2101 2102 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2103 DefaultFunctionArrayConversion(rex); 2104 return rex->getType(); 2105} 2106 2107/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2108/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2109QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 2110 QualType resType = op->getType(); 2111 assert(!resType.isNull() && "no type for increment/decrement expression"); 2112 2113 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2114 if (const PointerType *pt = resType->getAsPointerType()) { 2115 if (pt->getPointeeType()->isVoidType()) { 2116 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 2117 } else if (!pt->getPointeeType()->isObjectType()) { 2118 // C99 6.5.2.4p2, 6.5.6p2 2119 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 2120 resType.getAsString(), op->getSourceRange()); 2121 return QualType(); 2122 } 2123 } else if (!resType->isRealType()) { 2124 if (resType->isComplexType()) 2125 // C99 does not support ++/-- on complex types. 2126 Diag(OpLoc, diag::ext_integer_increment_complex, 2127 resType.getAsString(), op->getSourceRange()); 2128 else { 2129 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 2130 resType.getAsString(), op->getSourceRange()); 2131 return QualType(); 2132 } 2133 } 2134 // At this point, we know we have a real, complex or pointer type. 2135 // Now make sure the operand is a modifiable lvalue. 2136 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(Context); 2137 if (mlval != Expr::MLV_Valid) { 2138 // FIXME: emit a more precise diagnostic... 2139 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 2140 op->getSourceRange()); 2141 return QualType(); 2142 } 2143 return resType; 2144} 2145 2146/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2147/// This routine allows us to typecheck complex/recursive expressions 2148/// where the declaration is needed for type checking. We only need to 2149/// handle cases when the expression references a function designator 2150/// or is an lvalue. Here are some examples: 2151/// - &(x) => x 2152/// - &*****f => f for f a function designator. 2153/// - &s.xx => s 2154/// - &s.zz[1].yy -> s, if zz is an array 2155/// - *(x + 1) -> x, if x is an array 2156/// - &"123"[2] -> 0 2157/// - & __real__ x -> x 2158static ValueDecl *getPrimaryDecl(Expr *E) { 2159 switch (E->getStmtClass()) { 2160 case Stmt::DeclRefExprClass: 2161 return cast<DeclRefExpr>(E)->getDecl(); 2162 case Stmt::MemberExprClass: 2163 // Fields cannot be declared with a 'register' storage class. 2164 // &X->f is always ok, even if X is declared register. 2165 if (cast<MemberExpr>(E)->isArrow()) 2166 return 0; 2167 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2168 case Stmt::ArraySubscriptExprClass: { 2169 // &X[4] and &4[X] refers to X if X is not a pointer. 2170 2171 ValueDecl *VD = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2172 if (!VD || VD->getType()->isPointerType()) 2173 return 0; 2174 else 2175 return VD; 2176 } 2177 case Stmt::UnaryOperatorClass: { 2178 UnaryOperator *UO = cast<UnaryOperator>(E); 2179 2180 switch(UO->getOpcode()) { 2181 case UnaryOperator::Deref: { 2182 // *(X + 1) refers to X if X is not a pointer. 2183 ValueDecl *VD = getPrimaryDecl(UO->getSubExpr()); 2184 if (!VD || VD->getType()->isPointerType()) 2185 return 0; 2186 return VD; 2187 } 2188 case UnaryOperator::Real: 2189 case UnaryOperator::Imag: 2190 case UnaryOperator::Extension: 2191 return getPrimaryDecl(UO->getSubExpr()); 2192 default: 2193 return 0; 2194 } 2195 } 2196 case Stmt::BinaryOperatorClass: { 2197 BinaryOperator *BO = cast<BinaryOperator>(E); 2198 2199 // Handle cases involving pointer arithmetic. The result of an 2200 // Assign or AddAssign is not an lvalue so they can be ignored. 2201 2202 // (x + n) or (n + x) => x 2203 if (BO->getOpcode() == BinaryOperator::Add) { 2204 if (BO->getLHS()->getType()->isPointerType()) { 2205 return getPrimaryDecl(BO->getLHS()); 2206 } else if (BO->getRHS()->getType()->isPointerType()) { 2207 return getPrimaryDecl(BO->getRHS()); 2208 } 2209 } 2210 2211 return 0; 2212 } 2213 case Stmt::ParenExprClass: 2214 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2215 case Stmt::ImplicitCastExprClass: 2216 // &X[4] when X is an array, has an implicit cast from array to pointer. 2217 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2218 default: 2219 return 0; 2220 } 2221} 2222 2223/// CheckAddressOfOperand - The operand of & must be either a function 2224/// designator or an lvalue designating an object. If it is an lvalue, the 2225/// object cannot be declared with storage class register or be a bit field. 2226/// Note: The usual conversions are *not* applied to the operand of the & 2227/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2228QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2229 if (getLangOptions().C99) { 2230 // Implement C99-only parts of addressof rules. 2231 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2232 if (uOp->getOpcode() == UnaryOperator::Deref) 2233 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2234 // (assuming the deref expression is valid). 2235 return uOp->getSubExpr()->getType(); 2236 } 2237 // Technically, there should be a check for array subscript 2238 // expressions here, but the result of one is always an lvalue anyway. 2239 } 2240 ValueDecl *dcl = getPrimaryDecl(op); 2241 Expr::isLvalueResult lval = op->isLvalue(Context); 2242 2243 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2244 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2245 // FIXME: emit more specific diag... 2246 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 2247 op->getSourceRange()); 2248 return QualType(); 2249 } 2250 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2251 if (MemExpr->getMemberDecl()->isBitField()) { 2252 Diag(OpLoc, diag::err_typecheck_address_of, 2253 std::string("bit-field"), op->getSourceRange()); 2254 return QualType(); 2255 } 2256 // Check for Apple extension for accessing vector components. 2257 } else if (isa<ArraySubscriptExpr>(op) && 2258 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2259 Diag(OpLoc, diag::err_typecheck_address_of, 2260 std::string("vector"), op->getSourceRange()); 2261 return QualType(); 2262 } else if (dcl) { // C99 6.5.3.2p1 2263 // We have an lvalue with a decl. Make sure the decl is not declared 2264 // with the register storage-class specifier. 2265 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2266 if (vd->getStorageClass() == VarDecl::Register) { 2267 Diag(OpLoc, diag::err_typecheck_address_of, 2268 std::string("register variable"), op->getSourceRange()); 2269 return QualType(); 2270 } 2271 } else 2272 assert(0 && "Unknown/unexpected decl type"); 2273 } 2274 2275 // If the operand has type "type", the result has type "pointer to type". 2276 return Context.getPointerType(op->getType()); 2277} 2278 2279QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 2280 UsualUnaryConversions(op); 2281 QualType qType = op->getType(); 2282 2283 if (const PointerType *PT = qType->getAsPointerType()) { 2284 // Note that per both C89 and C99, this is always legal, even 2285 // if ptype is an incomplete type or void. 2286 // It would be possible to warn about dereferencing a 2287 // void pointer, but it's completely well-defined, 2288 // and such a warning is unlikely to catch any mistakes. 2289 return PT->getPointeeType(); 2290 } 2291 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 2292 qType.getAsString(), op->getSourceRange()); 2293 return QualType(); 2294} 2295 2296static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2297 tok::TokenKind Kind) { 2298 BinaryOperator::Opcode Opc; 2299 switch (Kind) { 2300 default: assert(0 && "Unknown binop!"); 2301 case tok::star: Opc = BinaryOperator::Mul; break; 2302 case tok::slash: Opc = BinaryOperator::Div; break; 2303 case tok::percent: Opc = BinaryOperator::Rem; break; 2304 case tok::plus: Opc = BinaryOperator::Add; break; 2305 case tok::minus: Opc = BinaryOperator::Sub; break; 2306 case tok::lessless: Opc = BinaryOperator::Shl; break; 2307 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2308 case tok::lessequal: Opc = BinaryOperator::LE; break; 2309 case tok::less: Opc = BinaryOperator::LT; break; 2310 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2311 case tok::greater: Opc = BinaryOperator::GT; break; 2312 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2313 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2314 case tok::amp: Opc = BinaryOperator::And; break; 2315 case tok::caret: Opc = BinaryOperator::Xor; break; 2316 case tok::pipe: Opc = BinaryOperator::Or; break; 2317 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2318 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2319 case tok::equal: Opc = BinaryOperator::Assign; break; 2320 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2321 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2322 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2323 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2324 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2325 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2326 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2327 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2328 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2329 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2330 case tok::comma: Opc = BinaryOperator::Comma; break; 2331 } 2332 return Opc; 2333} 2334 2335static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2336 tok::TokenKind Kind) { 2337 UnaryOperator::Opcode Opc; 2338 switch (Kind) { 2339 default: assert(0 && "Unknown unary op!"); 2340 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2341 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2342 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2343 case tok::star: Opc = UnaryOperator::Deref; break; 2344 case tok::plus: Opc = UnaryOperator::Plus; break; 2345 case tok::minus: Opc = UnaryOperator::Minus; break; 2346 case tok::tilde: Opc = UnaryOperator::Not; break; 2347 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2348 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 2349 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 2350 case tok::kw___real: Opc = UnaryOperator::Real; break; 2351 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2352 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2353 } 2354 return Opc; 2355} 2356 2357// Binary Operators. 'Tok' is the token for the operator. 2358Action::ExprResult Sema::ActOnBinOp(SourceLocation TokLoc, tok::TokenKind Kind, 2359 ExprTy *LHS, ExprTy *RHS) { 2360 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 2361 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 2362 2363 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 2364 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 2365 2366 QualType ResultTy; // Result type of the binary operator. 2367 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2368 2369 switch (Opc) { 2370 default: 2371 assert(0 && "Unknown binary expr!"); 2372 case BinaryOperator::Assign: 2373 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, QualType()); 2374 break; 2375 case BinaryOperator::Mul: 2376 case BinaryOperator::Div: 2377 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc); 2378 break; 2379 case BinaryOperator::Rem: 2380 ResultTy = CheckRemainderOperands(lhs, rhs, TokLoc); 2381 break; 2382 case BinaryOperator::Add: 2383 ResultTy = CheckAdditionOperands(lhs, rhs, TokLoc); 2384 break; 2385 case BinaryOperator::Sub: 2386 ResultTy = CheckSubtractionOperands(lhs, rhs, TokLoc); 2387 break; 2388 case BinaryOperator::Shl: 2389 case BinaryOperator::Shr: 2390 ResultTy = CheckShiftOperands(lhs, rhs, TokLoc); 2391 break; 2392 case BinaryOperator::LE: 2393 case BinaryOperator::LT: 2394 case BinaryOperator::GE: 2395 case BinaryOperator::GT: 2396 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, true); 2397 break; 2398 case BinaryOperator::EQ: 2399 case BinaryOperator::NE: 2400 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, false); 2401 break; 2402 case BinaryOperator::And: 2403 case BinaryOperator::Xor: 2404 case BinaryOperator::Or: 2405 ResultTy = CheckBitwiseOperands(lhs, rhs, TokLoc); 2406 break; 2407 case BinaryOperator::LAnd: 2408 case BinaryOperator::LOr: 2409 ResultTy = CheckLogicalOperands(lhs, rhs, TokLoc); 2410 break; 2411 case BinaryOperator::MulAssign: 2412 case BinaryOperator::DivAssign: 2413 CompTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc, true); 2414 if (!CompTy.isNull()) 2415 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2416 break; 2417 case BinaryOperator::RemAssign: 2418 CompTy = CheckRemainderOperands(lhs, rhs, TokLoc, true); 2419 if (!CompTy.isNull()) 2420 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2421 break; 2422 case BinaryOperator::AddAssign: 2423 CompTy = CheckAdditionOperands(lhs, rhs, TokLoc, true); 2424 if (!CompTy.isNull()) 2425 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2426 break; 2427 case BinaryOperator::SubAssign: 2428 CompTy = CheckSubtractionOperands(lhs, rhs, TokLoc, true); 2429 if (!CompTy.isNull()) 2430 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2431 break; 2432 case BinaryOperator::ShlAssign: 2433 case BinaryOperator::ShrAssign: 2434 CompTy = CheckShiftOperands(lhs, rhs, TokLoc, true); 2435 if (!CompTy.isNull()) 2436 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2437 break; 2438 case BinaryOperator::AndAssign: 2439 case BinaryOperator::XorAssign: 2440 case BinaryOperator::OrAssign: 2441 CompTy = CheckBitwiseOperands(lhs, rhs, TokLoc, true); 2442 if (!CompTy.isNull()) 2443 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2444 break; 2445 case BinaryOperator::Comma: 2446 ResultTy = CheckCommaOperands(lhs, rhs, TokLoc); 2447 break; 2448 } 2449 if (ResultTy.isNull()) 2450 return true; 2451 if (CompTy.isNull()) 2452 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 2453 else 2454 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, TokLoc); 2455} 2456 2457// Unary Operators. 'Tok' is the token for the operator. 2458Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2459 ExprTy *input) { 2460 Expr *Input = (Expr*)input; 2461 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2462 QualType resultType; 2463 switch (Opc) { 2464 default: 2465 assert(0 && "Unimplemented unary expr!"); 2466 case UnaryOperator::PreInc: 2467 case UnaryOperator::PreDec: 2468 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2469 break; 2470 case UnaryOperator::AddrOf: 2471 resultType = CheckAddressOfOperand(Input, OpLoc); 2472 break; 2473 case UnaryOperator::Deref: 2474 DefaultFunctionArrayConversion(Input); 2475 resultType = CheckIndirectionOperand(Input, OpLoc); 2476 break; 2477 case UnaryOperator::Plus: 2478 case UnaryOperator::Minus: 2479 UsualUnaryConversions(Input); 2480 resultType = Input->getType(); 2481 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2482 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2483 resultType.getAsString()); 2484 break; 2485 case UnaryOperator::Not: // bitwise complement 2486 UsualUnaryConversions(Input); 2487 resultType = Input->getType(); 2488 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 2489 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 2490 // C99 does not support '~' for complex conjugation. 2491 Diag(OpLoc, diag::ext_integer_complement_complex, 2492 resultType.getAsString(), Input->getSourceRange()); 2493 else if (!resultType->isIntegerType()) 2494 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2495 resultType.getAsString(), Input->getSourceRange()); 2496 break; 2497 case UnaryOperator::LNot: // logical negation 2498 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2499 DefaultFunctionArrayConversion(Input); 2500 resultType = Input->getType(); 2501 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2502 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2503 resultType.getAsString()); 2504 // LNot always has type int. C99 6.5.3.3p5. 2505 resultType = Context.IntTy; 2506 break; 2507 case UnaryOperator::SizeOf: 2508 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2509 Input->getSourceRange(), true); 2510 break; 2511 case UnaryOperator::AlignOf: 2512 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2513 Input->getSourceRange(), false); 2514 break; 2515 case UnaryOperator::Real: 2516 case UnaryOperator::Imag: 2517 resultType = CheckRealImagOperand(Input, OpLoc); 2518 break; 2519 case UnaryOperator::Extension: 2520 resultType = Input->getType(); 2521 break; 2522 } 2523 if (resultType.isNull()) 2524 return true; 2525 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2526} 2527 2528/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2529Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2530 SourceLocation LabLoc, 2531 IdentifierInfo *LabelII) { 2532 // Look up the record for this label identifier. 2533 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2534 2535 // If we haven't seen this label yet, create a forward reference. It 2536 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 2537 if (LabelDecl == 0) 2538 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2539 2540 // Create the AST node. The address of a label always has type 'void*'. 2541 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2542 Context.getPointerType(Context.VoidTy)); 2543} 2544 2545Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2546 SourceLocation RPLoc) { // "({..})" 2547 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2548 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2549 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2550 2551 // FIXME: there are a variety of strange constraints to enforce here, for 2552 // example, it is not possible to goto into a stmt expression apparently. 2553 // More semantic analysis is needed. 2554 2555 // FIXME: the last statement in the compount stmt has its value used. We 2556 // should not warn about it being unused. 2557 2558 // If there are sub stmts in the compound stmt, take the type of the last one 2559 // as the type of the stmtexpr. 2560 QualType Ty = Context.VoidTy; 2561 2562 if (!Compound->body_empty()) { 2563 Stmt *LastStmt = Compound->body_back(); 2564 // If LastStmt is a label, skip down through into the body. 2565 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 2566 LastStmt = Label->getSubStmt(); 2567 2568 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 2569 Ty = LastExpr->getType(); 2570 } 2571 2572 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2573} 2574 2575Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2576 SourceLocation TypeLoc, 2577 TypeTy *argty, 2578 OffsetOfComponent *CompPtr, 2579 unsigned NumComponents, 2580 SourceLocation RPLoc) { 2581 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2582 assert(!ArgTy.isNull() && "Missing type argument!"); 2583 2584 // We must have at least one component that refers to the type, and the first 2585 // one is known to be a field designator. Verify that the ArgTy represents 2586 // a struct/union/class. 2587 if (!ArgTy->isRecordType()) 2588 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2589 2590 // Otherwise, create a compound literal expression as the base, and 2591 // iteratively process the offsetof designators. 2592 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2593 2594 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2595 // GCC extension, diagnose them. 2596 if (NumComponents != 1) 2597 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2598 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2599 2600 for (unsigned i = 0; i != NumComponents; ++i) { 2601 const OffsetOfComponent &OC = CompPtr[i]; 2602 if (OC.isBrackets) { 2603 // Offset of an array sub-field. TODO: Should we allow vector elements? 2604 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 2605 if (!AT) { 2606 delete Res; 2607 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 2608 Res->getType().getAsString()); 2609 } 2610 2611 // FIXME: C++: Verify that operator[] isn't overloaded. 2612 2613 // C99 6.5.2.1p1 2614 Expr *Idx = static_cast<Expr*>(OC.U.E); 2615 if (!Idx->getType()->isIntegerType()) 2616 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 2617 Idx->getSourceRange()); 2618 2619 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 2620 continue; 2621 } 2622 2623 const RecordType *RC = Res->getType()->getAsRecordType(); 2624 if (!RC) { 2625 delete Res; 2626 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 2627 Res->getType().getAsString()); 2628 } 2629 2630 // Get the decl corresponding to this. 2631 RecordDecl *RD = RC->getDecl(); 2632 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 2633 if (!MemberDecl) 2634 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 2635 OC.U.IdentInfo->getName(), 2636 SourceRange(OC.LocStart, OC.LocEnd)); 2637 2638 // FIXME: C++: Verify that MemberDecl isn't a static field. 2639 // FIXME: Verify that MemberDecl isn't a bitfield. 2640 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 2641 // matter here. 2642 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, MemberDecl->getType()); 2643 } 2644 2645 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 2646 BuiltinLoc); 2647} 2648 2649 2650Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 2651 TypeTy *arg1, TypeTy *arg2, 2652 SourceLocation RPLoc) { 2653 QualType argT1 = QualType::getFromOpaquePtr(arg1); 2654 QualType argT2 = QualType::getFromOpaquePtr(arg2); 2655 2656 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 2657 2658 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 2659} 2660 2661Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 2662 ExprTy *expr1, ExprTy *expr2, 2663 SourceLocation RPLoc) { 2664 Expr *CondExpr = static_cast<Expr*>(cond); 2665 Expr *LHSExpr = static_cast<Expr*>(expr1); 2666 Expr *RHSExpr = static_cast<Expr*>(expr2); 2667 2668 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 2669 2670 // The conditional expression is required to be a constant expression. 2671 llvm::APSInt condEval(32); 2672 SourceLocation ExpLoc; 2673 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 2674 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 2675 CondExpr->getSourceRange()); 2676 2677 // If the condition is > zero, then the AST type is the same as the LSHExpr. 2678 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 2679 RHSExpr->getType(); 2680 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 2681} 2682 2683//===----------------------------------------------------------------------===// 2684// Clang Extensions. 2685//===----------------------------------------------------------------------===// 2686 2687/// ActOnBlockStart - This callback is invoked when a block literal is started. 2688void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope, 2689 Declarator &ParamInfo) { 2690 // Analyze block parameters. 2691 BlockSemaInfo *BSI = new BlockSemaInfo(); 2692 2693 // Add BSI to CurBlock. 2694 BSI->PrevBlockInfo = CurBlock; 2695 CurBlock = BSI; 2696 2697 BSI->ReturnType = 0; 2698 BSI->TheScope = BlockScope; 2699 2700 // Analyze arguments to block. 2701 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 2702 "Not a function declarator!"); 2703 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 2704 2705 BSI->hasPrototype = FTI.hasPrototype; 2706 BSI->isVariadic = true; 2707 2708 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 2709 // no arguments, not a function that takes a single void argument. 2710 if (FTI.hasPrototype && 2711 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2712 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 2713 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 2714 // empty arg list, don't push any params. 2715 BSI->isVariadic = false; 2716 } else if (FTI.hasPrototype) { 2717 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 2718 BSI->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 2719 BSI->isVariadic = FTI.isVariadic; 2720 } 2721} 2722 2723/// ActOnBlockError - If there is an error parsing a block, this callback 2724/// is invoked to pop the information about the block from the action impl. 2725void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 2726 // Ensure that CurBlock is deleted. 2727 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 2728 2729 // Pop off CurBlock, handle nested blocks. 2730 CurBlock = CurBlock->PrevBlockInfo; 2731 2732 // FIXME: Delete the ParmVarDecl objects as well??? 2733 2734} 2735 2736/// ActOnBlockStmtExpr - This is called when the body of a block statement 2737/// literal was successfully completed. ^(int x){...} 2738Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 2739 Scope *CurScope) { 2740 // Ensure that CurBlock is deleted. 2741 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 2742 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 2743 2744 // Pop off CurBlock, handle nested blocks. 2745 CurBlock = CurBlock->PrevBlockInfo; 2746 2747 QualType RetTy = Context.VoidTy; 2748 if (BSI->ReturnType) 2749 RetTy = QualType(BSI->ReturnType, 0); 2750 2751 llvm::SmallVector<QualType, 8> ArgTypes; 2752 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 2753 ArgTypes.push_back(BSI->Params[i]->getType()); 2754 2755 QualType BlockTy; 2756 if (!BSI->hasPrototype) 2757 BlockTy = Context.getFunctionTypeNoProto(RetTy); 2758 else 2759 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 2760 BSI->isVariadic); 2761 2762 BlockTy = Context.getBlockPointerType(BlockTy); 2763 return new BlockStmtExpr(CaretLoc, BlockTy, 2764 &BSI->Params[0], BSI->Params.size(), Body.take()); 2765} 2766 2767/// ActOnBlockExprExpr - This is called when the body of a block 2768/// expression literal was successfully completed. ^(int x)[foo bar: x] 2769Sema::ExprResult Sema::ActOnBlockExprExpr(SourceLocation CaretLoc, ExprTy *body, 2770 Scope *CurScope) { 2771 // Ensure that CurBlock is deleted. 2772 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 2773 llvm::OwningPtr<Expr> Body(static_cast<Expr*>(body)); 2774 2775 // Pop off CurBlock, handle nested blocks. 2776 CurBlock = CurBlock->PrevBlockInfo; 2777 2778 if (BSI->ReturnType) { 2779 Diag(CaretLoc, diag::err_return_in_block_expression); 2780 return true; 2781 } 2782 2783 QualType RetTy = Body->getType(); 2784 2785 llvm::SmallVector<QualType, 8> ArgTypes; 2786 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 2787 ArgTypes.push_back(BSI->Params[i]->getType()); 2788 2789 QualType BlockTy; 2790 if (!BSI->hasPrototype) 2791 BlockTy = Context.getFunctionTypeNoProto(RetTy); 2792 else 2793 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 2794 BSI->isVariadic); 2795 2796 BlockTy = Context.getBlockPointerType(BlockTy); 2797 return new BlockExprExpr(CaretLoc, BlockTy, 2798 &BSI->Params[0], BSI->Params.size(), Body.take()); 2799} 2800 2801/// ExprsMatchFnType - return true if the Exprs in array Args have 2802/// QualTypes that match the QualTypes of the arguments of the FnType. 2803/// The number of arguments has already been validated to match the number of 2804/// arguments in FnType. 2805static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 2806 ASTContext &Context) { 2807 unsigned NumParams = FnType->getNumArgs(); 2808 for (unsigned i = 0; i != NumParams; ++i) { 2809 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 2810 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 2811 2812 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 2813 return false; 2814 } 2815 return true; 2816} 2817 2818Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 2819 SourceLocation *CommaLocs, 2820 SourceLocation BuiltinLoc, 2821 SourceLocation RParenLoc) { 2822 // __builtin_overload requires at least 2 arguments 2823 if (NumArgs < 2) 2824 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2825 SourceRange(BuiltinLoc, RParenLoc)); 2826 2827 // The first argument is required to be a constant expression. It tells us 2828 // the number of arguments to pass to each of the functions to be overloaded. 2829 Expr **Args = reinterpret_cast<Expr**>(args); 2830 Expr *NParamsExpr = Args[0]; 2831 llvm::APSInt constEval(32); 2832 SourceLocation ExpLoc; 2833 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 2834 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2835 NParamsExpr->getSourceRange()); 2836 2837 // Verify that the number of parameters is > 0 2838 unsigned NumParams = constEval.getZExtValue(); 2839 if (NumParams == 0) 2840 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2841 NParamsExpr->getSourceRange()); 2842 // Verify that we have at least 1 + NumParams arguments to the builtin. 2843 if ((NumParams + 1) > NumArgs) 2844 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2845 SourceRange(BuiltinLoc, RParenLoc)); 2846 2847 // Figure out the return type, by matching the args to one of the functions 2848 // listed after the parameters. 2849 OverloadExpr *OE = 0; 2850 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 2851 // UsualUnaryConversions will convert the function DeclRefExpr into a 2852 // pointer to function. 2853 Expr *Fn = UsualUnaryConversions(Args[i]); 2854 const FunctionTypeProto *FnType = 0; 2855 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 2856 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 2857 2858 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 2859 // parameters, and the number of parameters must match the value passed to 2860 // the builtin. 2861 if (!FnType || (FnType->getNumArgs() != NumParams)) 2862 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 2863 Fn->getSourceRange()); 2864 2865 // Scan the parameter list for the FunctionType, checking the QualType of 2866 // each parameter against the QualTypes of the arguments to the builtin. 2867 // If they match, return a new OverloadExpr. 2868 if (ExprsMatchFnType(Args+1, FnType, Context)) { 2869 if (OE) 2870 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 2871 OE->getFn()->getSourceRange()); 2872 // Remember our match, and continue processing the remaining arguments 2873 // to catch any errors. 2874 OE = new OverloadExpr(Args, NumArgs, i, FnType->getResultType(), 2875 BuiltinLoc, RParenLoc); 2876 } 2877 } 2878 // Return the newly created OverloadExpr node, if we succeded in matching 2879 // exactly one of the candidate functions. 2880 if (OE) 2881 return OE; 2882 2883 // If we didn't find a matching function Expr in the __builtin_overload list 2884 // the return an error. 2885 std::string typeNames; 2886 for (unsigned i = 0; i != NumParams; ++i) { 2887 if (i != 0) typeNames += ", "; 2888 typeNames += Args[i+1]->getType().getAsString(); 2889 } 2890 2891 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 2892 SourceRange(BuiltinLoc, RParenLoc)); 2893} 2894 2895Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 2896 ExprTy *expr, TypeTy *type, 2897 SourceLocation RPLoc) { 2898 Expr *E = static_cast<Expr*>(expr); 2899 QualType T = QualType::getFromOpaquePtr(type); 2900 2901 InitBuiltinVaListType(); 2902 2903 // Get the va_list type 2904 QualType VaListType = Context.getBuiltinVaListType(); 2905 // Deal with implicit array decay; for example, on x86-64, 2906 // va_list is an array, but it's supposed to decay to 2907 // a pointer for va_arg. 2908 if (VaListType->isArrayType()) 2909 VaListType = Context.getArrayDecayedType(VaListType); 2910 // Make sure the input expression also decays appropriately. 2911 UsualUnaryConversions(E); 2912 2913 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 2914 return Diag(E->getLocStart(), 2915 diag::err_first_argument_to_va_arg_not_of_type_va_list, 2916 E->getType().getAsString(), 2917 E->getSourceRange()); 2918 2919 // FIXME: Warn if a non-POD type is passed in. 2920 2921 return new VAArgExpr(BuiltinLoc, E, T, RPLoc); 2922} 2923 2924bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 2925 SourceLocation Loc, 2926 QualType DstType, QualType SrcType, 2927 Expr *SrcExpr, const char *Flavor) { 2928 // Decode the result (notice that AST's are still created for extensions). 2929 bool isInvalid = false; 2930 unsigned DiagKind; 2931 switch (ConvTy) { 2932 default: assert(0 && "Unknown conversion type"); 2933 case Compatible: return false; 2934 case PointerToInt: 2935 DiagKind = diag::ext_typecheck_convert_pointer_int; 2936 break; 2937 case IntToPointer: 2938 DiagKind = diag::ext_typecheck_convert_int_pointer; 2939 break; 2940 case IncompatiblePointer: 2941 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 2942 break; 2943 case FunctionVoidPointer: 2944 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 2945 break; 2946 case CompatiblePointerDiscardsQualifiers: 2947 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 2948 break; 2949 case IntToBlockPointer: 2950 DiagKind = diag::err_int_to_block_pointer; 2951 break; 2952 case IncompatibleBlockPointer: 2953 DiagKind = diag::err_typecheck_convert_incompatible_block_pointer; 2954 break; 2955 case BlockVoidPointer: 2956 DiagKind = diag::ext_typecheck_convert_pointer_void_block; 2957 break; 2958 case Incompatible: 2959 DiagKind = diag::err_typecheck_convert_incompatible; 2960 isInvalid = true; 2961 break; 2962 } 2963 2964 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 2965 SrcExpr->getSourceRange()); 2966 return isInvalid; 2967} 2968