SemaExpr.cpp revision 45014fd2d7e50079dc092df04fec9af7ea0cb0e0
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/Lex/Preprocessor.h" 20#include "clang/Lex/LiteralSupport.h" 21#include "clang/Basic/Diagnostic.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29//===----------------------------------------------------------------------===// 30// Standard Promotions and Conversions 31//===----------------------------------------------------------------------===// 32 33/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 34void Sema::DefaultFunctionArrayConversion(Expr *&E) { 35 QualType Ty = E->getType(); 36 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 37 38 if (Ty->isFunctionType()) 39 ImpCastExprToType(E, Context.getPointerType(Ty)); 40 else if (Ty->isArrayType()) { 41 // In C90 mode, arrays only promote to pointers if the array expression is 42 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 43 // type 'array of type' is converted to an expression that has type 'pointer 44 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 45 // that has type 'array of type' ...". The relevant change is "an lvalue" 46 // (C90) to "an expression" (C99). 47 // 48 // C++ 4.2p1: 49 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 50 // T" can be converted to an rvalue of type "pointer to T". 51 // 52 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 53 E->isLvalue(Context) == Expr::LV_Valid) 54 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 55 } 56} 57 58/// UsualUnaryConversions - Performs various conversions that are common to most 59/// operators (C99 6.3). The conversions of array and function types are 60/// sometimes surpressed. For example, the array->pointer conversion doesn't 61/// apply if the array is an argument to the sizeof or address (&) operators. 62/// In these instances, this routine should *not* be called. 63Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 64 QualType Ty = Expr->getType(); 65 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 66 67 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 68 ImpCastExprToType(Expr, Context.IntTy); 69 else 70 DefaultFunctionArrayConversion(Expr); 71 72 return Expr; 73} 74 75/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 76/// do not have a prototype. Arguments that have type float are promoted to 77/// double. All other argument types are converted by UsualUnaryConversions(). 78void Sema::DefaultArgumentPromotion(Expr *&Expr) { 79 QualType Ty = Expr->getType(); 80 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 81 82 // If this is a 'float' (CVR qualified or typedef) promote to double. 83 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 84 if (BT->getKind() == BuiltinType::Float) 85 return ImpCastExprToType(Expr, Context.DoubleTy); 86 87 UsualUnaryConversions(Expr); 88} 89 90/// UsualArithmeticConversions - Performs various conversions that are common to 91/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 92/// routine returns the first non-arithmetic type found. The client is 93/// responsible for emitting appropriate error diagnostics. 94/// FIXME: verify the conversion rules for "complex int" are consistent with 95/// GCC. 96QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 97 bool isCompAssign) { 98 if (!isCompAssign) { 99 UsualUnaryConversions(lhsExpr); 100 UsualUnaryConversions(rhsExpr); 101 } 102 // For conversion purposes, we ignore any qualifiers. 103 // For example, "const float" and "float" are equivalent. 104 QualType lhs = 105 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 106 QualType rhs = 107 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 108 109 // If both types are identical, no conversion is needed. 110 if (lhs == rhs) 111 return lhs; 112 113 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 114 // The caller can deal with this (e.g. pointer + int). 115 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 116 return lhs; 117 118 // At this point, we have two different arithmetic types. 119 120 // Handle complex types first (C99 6.3.1.8p1). 121 if (lhs->isComplexType() || rhs->isComplexType()) { 122 // if we have an integer operand, the result is the complex type. 123 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 124 // convert the rhs to the lhs complex type. 125 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 126 return lhs; 127 } 128 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 129 // convert the lhs to the rhs complex type. 130 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 131 return rhs; 132 } 133 // This handles complex/complex, complex/float, or float/complex. 134 // When both operands are complex, the shorter operand is converted to the 135 // type of the longer, and that is the type of the result. This corresponds 136 // to what is done when combining two real floating-point operands. 137 // The fun begins when size promotion occur across type domains. 138 // From H&S 6.3.4: When one operand is complex and the other is a real 139 // floating-point type, the less precise type is converted, within it's 140 // real or complex domain, to the precision of the other type. For example, 141 // when combining a "long double" with a "double _Complex", the 142 // "double _Complex" is promoted to "long double _Complex". 143 int result = Context.getFloatingTypeOrder(lhs, rhs); 144 145 if (result > 0) { // The left side is bigger, convert rhs. 146 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 147 if (!isCompAssign) 148 ImpCastExprToType(rhsExpr, rhs); 149 } else if (result < 0) { // The right side is bigger, convert lhs. 150 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 151 if (!isCompAssign) 152 ImpCastExprToType(lhsExpr, lhs); 153 } 154 // At this point, lhs and rhs have the same rank/size. Now, make sure the 155 // domains match. This is a requirement for our implementation, C99 156 // does not require this promotion. 157 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 158 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 159 if (!isCompAssign) 160 ImpCastExprToType(lhsExpr, rhs); 161 return rhs; 162 } else { // handle "_Complex double, double". 163 if (!isCompAssign) 164 ImpCastExprToType(rhsExpr, lhs); 165 return lhs; 166 } 167 } 168 return lhs; // The domain/size match exactly. 169 } 170 // Now handle "real" floating types (i.e. float, double, long double). 171 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 172 // if we have an integer operand, the result is the real floating type. 173 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 174 // convert rhs to the lhs floating point type. 175 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 176 return lhs; 177 } 178 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 179 // convert lhs to the rhs floating point type. 180 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 181 return rhs; 182 } 183 // We have two real floating types, float/complex combos were handled above. 184 // Convert the smaller operand to the bigger result. 185 int result = Context.getFloatingTypeOrder(lhs, rhs); 186 187 if (result > 0) { // convert the rhs 188 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 189 return lhs; 190 } 191 if (result < 0) { // convert the lhs 192 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 193 return rhs; 194 } 195 assert(0 && "Sema::UsualArithmeticConversions(): illegal float comparison"); 196 } 197 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 198 // Handle GCC complex int extension. 199 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 200 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 201 202 if (lhsComplexInt && rhsComplexInt) { 203 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 204 rhsComplexInt->getElementType()) >= 0) { 205 // convert the rhs 206 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 207 return lhs; 208 } 209 if (!isCompAssign) 210 ImpCastExprToType(lhsExpr, rhs); // convert the lhs 211 return rhs; 212 } else if (lhsComplexInt && rhs->isIntegerType()) { 213 // convert the rhs to the lhs complex type. 214 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 215 return lhs; 216 } else if (rhsComplexInt && lhs->isIntegerType()) { 217 // convert the lhs to the rhs complex type. 218 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 219 return rhs; 220 } 221 } 222 // Finally, we have two differing integer types. 223 // The rules for this case are in C99 6.3.1.8 224 int compare = Context.getIntegerTypeOrder(lhs, rhs); 225 bool lhsSigned = lhs->isSignedIntegerType(), 226 rhsSigned = rhs->isSignedIntegerType(); 227 QualType destType; 228 if (lhsSigned == rhsSigned) { 229 // Same signedness; use the higher-ranked type 230 destType = compare >= 0 ? lhs : rhs; 231 } else if (compare != (lhsSigned ? 1 : -1)) { 232 // The unsigned type has greater than or equal rank to the 233 // signed type, so use the unsigned type 234 destType = lhsSigned ? rhs : lhs; 235 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 236 // The two types are different widths; if we are here, that 237 // means the signed type is larger than the unsigned type, so 238 // use the signed type. 239 destType = lhsSigned ? lhs : rhs; 240 } else { 241 // The signed type is higher-ranked than the unsigned type, 242 // but isn't actually any bigger (like unsigned int and long 243 // on most 32-bit systems). Use the unsigned type corresponding 244 // to the signed type. 245 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 246 } 247 if (!isCompAssign) { 248 ImpCastExprToType(lhsExpr, destType); 249 ImpCastExprToType(rhsExpr, destType); 250 } 251 return destType; 252} 253 254//===----------------------------------------------------------------------===// 255// Semantic Analysis for various Expression Types 256//===----------------------------------------------------------------------===// 257 258 259/// ActOnStringLiteral - The specified tokens were lexed as pasted string 260/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 261/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 262/// multiple tokens. However, the common case is that StringToks points to one 263/// string. 264/// 265Action::ExprResult 266Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 267 assert(NumStringToks && "Must have at least one string!"); 268 269 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 270 if (Literal.hadError) 271 return ExprResult(true); 272 273 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 274 for (unsigned i = 0; i != NumStringToks; ++i) 275 StringTokLocs.push_back(StringToks[i].getLocation()); 276 277 // Verify that pascal strings aren't too large. 278 if (Literal.Pascal && Literal.GetStringLength() > 256) 279 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long, 280 SourceRange(StringToks[0].getLocation(), 281 StringToks[NumStringToks-1].getLocation())); 282 283 QualType StrTy = Context.CharTy; 284 if (Literal.AnyWide) StrTy = Context.getWCharType(); 285 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 286 287 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 288 if (getLangOptions().CPlusPlus) 289 StrTy.addConst(); 290 291 // Get an array type for the string, according to C99 6.4.5. This includes 292 // the nul terminator character as well as the string length for pascal 293 // strings. 294 StrTy = Context.getConstantArrayType(StrTy, 295 llvm::APInt(32, Literal.GetStringLength()+1), 296 ArrayType::Normal, 0); 297 298 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 299 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 300 Literal.AnyWide, StrTy, 301 StringToks[0].getLocation(), 302 StringToks[NumStringToks-1].getLocation()); 303} 304 305/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 306/// CurBlock to VD should cause it to be snapshotted (as we do for auto 307/// variables defined outside the block) or false if this is not needed (e.g. 308/// for values inside the block or for globals). 309/// 310/// FIXME: This will create BlockDeclRefExprs for global variables, 311/// function references, etc which is suboptimal :) and breaks 312/// things like "integer constant expression" tests. 313static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 314 ValueDecl *VD) { 315 // If the value is defined inside the block, we couldn't snapshot it even if 316 // we wanted to. 317 if (CurBlock->TheDecl == VD->getDeclContext()) 318 return false; 319 320 // If this is an enum constant or function, it is constant, don't snapshot. 321 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 322 return false; 323 324 // If this is a reference to an extern, static, or global variable, no need to 325 // snapshot it. 326 // FIXME: What about 'const' variables in C++? 327 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 328 return Var->hasLocalStorage(); 329 330 return true; 331} 332 333 334 335/// ActOnIdentifierExpr - The parser read an identifier in expression context, 336/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 337/// identifier is used in a function call context. 338/// LookupCtx is only used for a C++ qualified-id (foo::bar) to indicate the 339/// class or namespace that the identifier must be a member of. 340Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 341 IdentifierInfo &II, 342 bool HasTrailingLParen, 343 const CXXScopeSpec *SS) { 344 // Could be enum-constant, value decl, instance variable, etc. 345 Decl *D; 346 if (SS && !SS->isEmpty()) { 347 DeclContext *DC = static_cast<DeclContext*>(SS->getScopeRep()); 348 if (DC == 0) 349 return true; 350 D = LookupDecl(&II, Decl::IDNS_Ordinary, S, DC); 351 } else 352 D = LookupDecl(&II, Decl::IDNS_Ordinary, S); 353 354 // If this reference is in an Objective-C method, then ivar lookup happens as 355 // well. 356 if (getCurMethodDecl()) { 357 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 358 // There are two cases to handle here. 1) scoped lookup could have failed, 359 // in which case we should look for an ivar. 2) scoped lookup could have 360 // found a decl, but that decl is outside the current method (i.e. a global 361 // variable). In these two cases, we do a lookup for an ivar with this 362 // name, if the lookup suceeds, we replace it our current decl. 363 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 364 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 365 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&II)) { 366 // FIXME: This should use a new expr for a direct reference, don't turn 367 // this into Self->ivar, just return a BareIVarExpr or something. 368 IdentifierInfo &II = Context.Idents.get("self"); 369 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 370 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 371 static_cast<Expr*>(SelfExpr.Val), true, true); 372 } 373 } 374 // Needed to implement property "super.method" notation. 375 if (SD == 0 && &II == SuperID) { 376 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 377 getCurMethodDecl()->getClassInterface())); 378 return new ObjCSuperExpr(Loc, T); 379 } 380 } 381 if (D == 0) { 382 // Otherwise, this could be an implicitly declared function reference (legal 383 // in C90, extension in C99). 384 if (HasTrailingLParen && 385 !getLangOptions().CPlusPlus) // Not in C++. 386 D = ImplicitlyDefineFunction(Loc, II, S); 387 else { 388 // If this name wasn't predeclared and if this is not a function call, 389 // diagnose the problem. 390 if (SS && !SS->isEmpty()) 391 return Diag(Loc, diag::err_typecheck_no_member, 392 II.getName(), SS->getRange()); 393 else 394 return Diag(Loc, diag::err_undeclared_var_use, II.getName()); 395 } 396 } 397 398 if (CXXFieldDecl *FD = dyn_cast<CXXFieldDecl>(D)) { 399 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 400 if (MD->isStatic()) 401 // "invalid use of member 'x' in static member function" 402 return Diag(Loc, diag::err_invalid_member_use_in_static_method, 403 FD->getName()); 404 if (cast<CXXRecordDecl>(MD->getParent()) != FD->getParent()) 405 // "invalid use of nonstatic data member 'x'" 406 return Diag(Loc, diag::err_invalid_non_static_member_use, 407 FD->getName()); 408 409 if (FD->isInvalidDecl()) 410 return true; 411 412 // FIXME: Handle 'mutable'. 413 return new DeclRefExpr(FD, 414 FD->getType().getWithAdditionalQualifiers(MD->getTypeQualifiers()),Loc); 415 } 416 417 return Diag(Loc, diag::err_invalid_non_static_member_use, FD->getName()); 418 } 419 if (isa<TypedefDecl>(D)) 420 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 421 if (isa<ObjCInterfaceDecl>(D)) 422 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 423 if (isa<NamespaceDecl>(D)) 424 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 425 426 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 427 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 428 return new DeclRefExpr(Ovl, Context.OverloadTy, Loc); 429 430 ValueDecl *VD = cast<ValueDecl>(D); 431 432 // check if referencing an identifier with __attribute__((deprecated)). 433 if (VD->getAttr<DeprecatedAttr>()) 434 Diag(Loc, diag::warn_deprecated, VD->getName()); 435 436 // Only create DeclRefExpr's for valid Decl's. 437 if (VD->isInvalidDecl()) 438 return true; 439 440 // If the identifier reference is inside a block, and it refers to a value 441 // that is outside the block, create a BlockDeclRefExpr instead of a 442 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 443 // the block is formed. 444 // 445 // We do not do this for things like enum constants, global variables, etc, 446 // as they do not get snapshotted. 447 // 448 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 449 // The BlocksAttr indicates the variable is bound by-reference. 450 if (VD->getAttr<BlocksAttr>()) 451 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 452 Loc, true); 453 454 // Variable will be bound by-copy, make it const within the closure. 455 VD->getType().addConst(); 456 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 457 Loc, false); 458 } 459 // If this reference is not in a block or if the referenced variable is 460 // within the block, create a normal DeclRefExpr. 461 return new DeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc); 462} 463 464Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 465 tok::TokenKind Kind) { 466 PredefinedExpr::IdentType IT; 467 468 switch (Kind) { 469 default: assert(0 && "Unknown simple primary expr!"); 470 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 471 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 472 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 473 } 474 475 // Verify that this is in a function context. 476 if (getCurFunctionDecl() == 0 && getCurMethodDecl() == 0) 477 return Diag(Loc, diag::err_predef_outside_function); 478 479 // Pre-defined identifiers are of type char[x], where x is the length of the 480 // string. 481 unsigned Length; 482 if (getCurFunctionDecl()) 483 Length = getCurFunctionDecl()->getIdentifier()->getLength(); 484 else 485 Length = getCurMethodDecl()->getSynthesizedMethodSize(); 486 487 llvm::APInt LengthI(32, Length + 1); 488 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 489 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 490 return new PredefinedExpr(Loc, ResTy, IT); 491} 492 493Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 494 llvm::SmallString<16> CharBuffer; 495 CharBuffer.resize(Tok.getLength()); 496 const char *ThisTokBegin = &CharBuffer[0]; 497 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 498 499 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 500 Tok.getLocation(), PP); 501 if (Literal.hadError()) 502 return ExprResult(true); 503 504 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 505 506 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 507 Tok.getLocation()); 508} 509 510Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 511 // fast path for a single digit (which is quite common). A single digit 512 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 513 if (Tok.getLength() == 1) { 514 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 515 516 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 517 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 518 Context.IntTy, 519 Tok.getLocation())); 520 } 521 llvm::SmallString<512> IntegerBuffer; 522 // Add padding so that NumericLiteralParser can overread by one character. 523 IntegerBuffer.resize(Tok.getLength()+1); 524 const char *ThisTokBegin = &IntegerBuffer[0]; 525 526 // Get the spelling of the token, which eliminates trigraphs, etc. 527 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 528 529 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 530 Tok.getLocation(), PP); 531 if (Literal.hadError) 532 return ExprResult(true); 533 534 Expr *Res; 535 536 if (Literal.isFloatingLiteral()) { 537 QualType Ty; 538 if (Literal.isFloat) 539 Ty = Context.FloatTy; 540 else if (!Literal.isLong) 541 Ty = Context.DoubleTy; 542 else 543 Ty = Context.LongDoubleTy; 544 545 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 546 547 // isExact will be set by GetFloatValue(). 548 bool isExact = false; 549 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 550 Ty, Tok.getLocation()); 551 552 } else if (!Literal.isIntegerLiteral()) { 553 return ExprResult(true); 554 } else { 555 QualType Ty; 556 557 // long long is a C99 feature. 558 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 559 Literal.isLongLong) 560 Diag(Tok.getLocation(), diag::ext_longlong); 561 562 // Get the value in the widest-possible width. 563 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 564 565 if (Literal.GetIntegerValue(ResultVal)) { 566 // If this value didn't fit into uintmax_t, warn and force to ull. 567 Diag(Tok.getLocation(), diag::warn_integer_too_large); 568 Ty = Context.UnsignedLongLongTy; 569 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 570 "long long is not intmax_t?"); 571 } else { 572 // If this value fits into a ULL, try to figure out what else it fits into 573 // according to the rules of C99 6.4.4.1p5. 574 575 // Octal, Hexadecimal, and integers with a U suffix are allowed to 576 // be an unsigned int. 577 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 578 579 // Check from smallest to largest, picking the smallest type we can. 580 unsigned Width = 0; 581 if (!Literal.isLong && !Literal.isLongLong) { 582 // Are int/unsigned possibilities? 583 unsigned IntSize = Context.Target.getIntWidth(); 584 585 // Does it fit in a unsigned int? 586 if (ResultVal.isIntN(IntSize)) { 587 // Does it fit in a signed int? 588 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 589 Ty = Context.IntTy; 590 else if (AllowUnsigned) 591 Ty = Context.UnsignedIntTy; 592 Width = IntSize; 593 } 594 } 595 596 // Are long/unsigned long possibilities? 597 if (Ty.isNull() && !Literal.isLongLong) { 598 unsigned LongSize = Context.Target.getLongWidth(); 599 600 // Does it fit in a unsigned long? 601 if (ResultVal.isIntN(LongSize)) { 602 // Does it fit in a signed long? 603 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 604 Ty = Context.LongTy; 605 else if (AllowUnsigned) 606 Ty = Context.UnsignedLongTy; 607 Width = LongSize; 608 } 609 } 610 611 // Finally, check long long if needed. 612 if (Ty.isNull()) { 613 unsigned LongLongSize = Context.Target.getLongLongWidth(); 614 615 // Does it fit in a unsigned long long? 616 if (ResultVal.isIntN(LongLongSize)) { 617 // Does it fit in a signed long long? 618 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 619 Ty = Context.LongLongTy; 620 else if (AllowUnsigned) 621 Ty = Context.UnsignedLongLongTy; 622 Width = LongLongSize; 623 } 624 } 625 626 // If we still couldn't decide a type, we probably have something that 627 // does not fit in a signed long long, but has no U suffix. 628 if (Ty.isNull()) { 629 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 630 Ty = Context.UnsignedLongLongTy; 631 Width = Context.Target.getLongLongWidth(); 632 } 633 634 if (ResultVal.getBitWidth() != Width) 635 ResultVal.trunc(Width); 636 } 637 638 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 639 } 640 641 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 642 if (Literal.isImaginary) 643 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 644 645 return Res; 646} 647 648Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 649 ExprTy *Val) { 650 Expr *E = (Expr *)Val; 651 assert((E != 0) && "ActOnParenExpr() missing expr"); 652 return new ParenExpr(L, R, E); 653} 654 655/// The UsualUnaryConversions() function is *not* called by this routine. 656/// See C99 6.3.2.1p[2-4] for more details. 657QualType Sema::CheckSizeOfAlignOfOperand(QualType exprType, 658 SourceLocation OpLoc, 659 const SourceRange &ExprRange, 660 bool isSizeof) { 661 // C99 6.5.3.4p1: 662 if (isa<FunctionType>(exprType) && isSizeof) 663 // alignof(function) is allowed. 664 Diag(OpLoc, diag::ext_sizeof_function_type, ExprRange); 665 else if (exprType->isVoidType()) 666 Diag(OpLoc, diag::ext_sizeof_void_type, isSizeof ? "sizeof" : "__alignof", 667 ExprRange); 668 else if (exprType->isIncompleteType()) { 669 Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 670 diag::err_alignof_incomplete_type, 671 exprType.getAsString(), ExprRange); 672 return QualType(); // error 673 } 674 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 675 return Context.getSizeType(); 676} 677 678Action::ExprResult Sema:: 679ActOnSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, 680 SourceLocation LPLoc, TypeTy *Ty, 681 SourceLocation RPLoc) { 682 // If error parsing type, ignore. 683 if (Ty == 0) return true; 684 685 // Verify that this is a valid expression. 686 QualType ArgTy = QualType::getFromOpaquePtr(Ty); 687 688 QualType resultType = 689 CheckSizeOfAlignOfOperand(ArgTy, OpLoc, SourceRange(LPLoc, RPLoc),isSizeof); 690 691 if (resultType.isNull()) 692 return true; 693 return new SizeOfAlignOfTypeExpr(isSizeof, ArgTy, resultType, OpLoc, RPLoc); 694} 695 696QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 697 DefaultFunctionArrayConversion(V); 698 699 // These operators return the element type of a complex type. 700 if (const ComplexType *CT = V->getType()->getAsComplexType()) 701 return CT->getElementType(); 702 703 // Otherwise they pass through real integer and floating point types here. 704 if (V->getType()->isArithmeticType()) 705 return V->getType(); 706 707 // Reject anything else. 708 Diag(Loc, diag::err_realimag_invalid_type, V->getType().getAsString()); 709 return QualType(); 710} 711 712 713 714Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 715 tok::TokenKind Kind, 716 ExprTy *Input) { 717 UnaryOperator::Opcode Opc; 718 switch (Kind) { 719 default: assert(0 && "Unknown unary op!"); 720 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 721 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 722 } 723 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 724 if (result.isNull()) 725 return true; 726 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 727} 728 729Action::ExprResult Sema:: 730ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 731 ExprTy *Idx, SourceLocation RLoc) { 732 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 733 734 // Perform default conversions. 735 DefaultFunctionArrayConversion(LHSExp); 736 DefaultFunctionArrayConversion(RHSExp); 737 738 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 739 740 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 741 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 742 // in the subscript position. As a result, we need to derive the array base 743 // and index from the expression types. 744 Expr *BaseExpr, *IndexExpr; 745 QualType ResultType; 746 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 747 BaseExpr = LHSExp; 748 IndexExpr = RHSExp; 749 // FIXME: need to deal with const... 750 ResultType = PTy->getPointeeType(); 751 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 752 // Handle the uncommon case of "123[Ptr]". 753 BaseExpr = RHSExp; 754 IndexExpr = LHSExp; 755 // FIXME: need to deal with const... 756 ResultType = PTy->getPointeeType(); 757 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 758 BaseExpr = LHSExp; // vectors: V[123] 759 IndexExpr = RHSExp; 760 761 // Component access limited to variables (reject vec4.rg[1]). 762 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 763 !isa<ExtVectorElementExpr>(BaseExpr)) 764 return Diag(LLoc, diag::err_ext_vector_component_access, 765 SourceRange(LLoc, RLoc)); 766 // FIXME: need to deal with const... 767 ResultType = VTy->getElementType(); 768 } else { 769 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value, 770 RHSExp->getSourceRange()); 771 } 772 // C99 6.5.2.1p1 773 if (!IndexExpr->getType()->isIntegerType()) 774 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript, 775 IndexExpr->getSourceRange()); 776 777 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 778 // the following check catches trying to index a pointer to a function (e.g. 779 // void (*)(int)) and pointers to incomplete types. Functions are not 780 // objects in C99. 781 if (!ResultType->isObjectType()) 782 return Diag(BaseExpr->getLocStart(), 783 diag::err_typecheck_subscript_not_object, 784 BaseExpr->getType().getAsString(), BaseExpr->getSourceRange()); 785 786 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 787} 788 789QualType Sema:: 790CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 791 IdentifierInfo &CompName, SourceLocation CompLoc) { 792 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 793 794 // This flag determines whether or not the component is to be treated as a 795 // special name, or a regular GLSL-style component access. 796 bool SpecialComponent = false; 797 798 // The vector accessor can't exceed the number of elements. 799 const char *compStr = CompName.getName(); 800 if (strlen(compStr) > vecType->getNumElements()) { 801 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 802 baseType.getAsString(), SourceRange(CompLoc)); 803 return QualType(); 804 } 805 806 // Check that we've found one of the special components, or that the component 807 // names must come from the same set. 808 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 809 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 810 SpecialComponent = true; 811 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 812 do 813 compStr++; 814 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 815 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 816 do 817 compStr++; 818 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 819 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 820 do 821 compStr++; 822 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 823 } 824 825 if (!SpecialComponent && *compStr) { 826 // We didn't get to the end of the string. This means the component names 827 // didn't come from the same set *or* we encountered an illegal name. 828 Diag(OpLoc, diag::err_ext_vector_component_name_illegal, 829 std::string(compStr,compStr+1), SourceRange(CompLoc)); 830 return QualType(); 831 } 832 // Each component accessor can't exceed the vector type. 833 compStr = CompName.getName(); 834 while (*compStr) { 835 if (vecType->isAccessorWithinNumElements(*compStr)) 836 compStr++; 837 else 838 break; 839 } 840 if (!SpecialComponent && *compStr) { 841 // We didn't get to the end of the string. This means a component accessor 842 // exceeds the number of elements in the vector. 843 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 844 baseType.getAsString(), SourceRange(CompLoc)); 845 return QualType(); 846 } 847 848 // If we have a special component name, verify that the current vector length 849 // is an even number, since all special component names return exactly half 850 // the elements. 851 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 852 Diag(OpLoc, diag::err_ext_vector_component_requires_even, 853 baseType.getAsString(), SourceRange(CompLoc)); 854 return QualType(); 855 } 856 857 // The component accessor looks fine - now we need to compute the actual type. 858 // The vector type is implied by the component accessor. For example, 859 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 860 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 861 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 862 : strlen(CompName.getName()); 863 if (CompSize == 1) 864 return vecType->getElementType(); 865 866 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 867 // Now look up the TypeDefDecl from the vector type. Without this, 868 // diagostics look bad. We want extended vector types to appear built-in. 869 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 870 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 871 return Context.getTypedefType(ExtVectorDecls[i]); 872 } 873 return VT; // should never get here (a typedef type should always be found). 874} 875 876/// constructSetterName - Return the setter name for the given 877/// identifier, i.e. "set" + Name where the initial character of Name 878/// has been capitalized. 879// FIXME: Merge with same routine in Parser. But where should this 880// live? 881static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 882 const IdentifierInfo *Name) { 883 unsigned N = Name->getLength(); 884 char *SelectorName = new char[3 + N]; 885 memcpy(SelectorName, "set", 3); 886 memcpy(&SelectorName[3], Name->getName(), N); 887 SelectorName[3] = toupper(SelectorName[3]); 888 889 IdentifierInfo *Setter = 890 &Idents.get(SelectorName, &SelectorName[3 + N]); 891 delete[] SelectorName; 892 return Setter; 893} 894 895Action::ExprResult Sema:: 896ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 897 tok::TokenKind OpKind, SourceLocation MemberLoc, 898 IdentifierInfo &Member) { 899 Expr *BaseExpr = static_cast<Expr *>(Base); 900 assert(BaseExpr && "no record expression"); 901 902 // Perform default conversions. 903 DefaultFunctionArrayConversion(BaseExpr); 904 905 QualType BaseType = BaseExpr->getType(); 906 assert(!BaseType.isNull() && "no type for member expression"); 907 908 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 909 // must have pointer type, and the accessed type is the pointee. 910 if (OpKind == tok::arrow) { 911 if (const PointerType *PT = BaseType->getAsPointerType()) 912 BaseType = PT->getPointeeType(); 913 else 914 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow, 915 BaseType.getAsString(), BaseExpr->getSourceRange()); 916 } 917 918 // Handle field access to simple records. This also handles access to fields 919 // of the ObjC 'id' struct. 920 if (const RecordType *RTy = BaseType->getAsRecordType()) { 921 RecordDecl *RDecl = RTy->getDecl(); 922 if (RTy->isIncompleteType()) 923 return Diag(OpLoc, diag::err_typecheck_incomplete_tag, RDecl->getName(), 924 BaseExpr->getSourceRange()); 925 // The record definition is complete, now make sure the member is valid. 926 FieldDecl *MemberDecl = RDecl->getMember(&Member); 927 if (!MemberDecl) 928 return Diag(MemberLoc, diag::err_typecheck_no_member, Member.getName(), 929 BaseExpr->getSourceRange()); 930 931 // Figure out the type of the member; see C99 6.5.2.3p3 932 // FIXME: Handle address space modifiers 933 QualType MemberType = MemberDecl->getType(); 934 unsigned combinedQualifiers = 935 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 936 MemberType = MemberType.getQualifiedType(combinedQualifiers); 937 938 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 939 MemberLoc, MemberType); 940 } 941 942 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 943 // (*Obj).ivar. 944 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 945 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) 946 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 947 OpKind == tok::arrow); 948 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar, 949 IFTy->getDecl()->getName(), Member.getName(), 950 BaseExpr->getSourceRange()); 951 } 952 953 // Handle Objective-C property access, which is "Obj.property" where Obj is a 954 // pointer to a (potentially qualified) interface type. 955 const PointerType *PTy; 956 const ObjCInterfaceType *IFTy; 957 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 958 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 959 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 960 961 // Search for a declared property first. 962 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 963 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 964 965 // Check protocols on qualified interfaces. 966 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 967 E = IFTy->qual_end(); I != E; ++I) 968 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 969 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 970 971 // If that failed, look for an "implicit" property by seeing if the nullary 972 // selector is implemented. 973 974 // FIXME: The logic for looking up nullary and unary selectors should be 975 // shared with the code in ActOnInstanceMessage. 976 977 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 978 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 979 980 // If this reference is in an @implementation, check for 'private' methods. 981 if (!Getter) 982 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 983 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 984 if (ObjCImplementationDecl *ImpDecl = 985 ObjCImplementations[ClassDecl->getIdentifier()]) 986 Getter = ImpDecl->getInstanceMethod(Sel); 987 988 // Look through local category implementations associated with the class. 989 if (!Getter) { 990 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 991 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 992 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 993 } 994 } 995 if (Getter) { 996 // If we found a getter then this may be a valid dot-reference, we 997 // need to also look for the matching setter. 998 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 999 &Member); 1000 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 1001 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1002 1003 if (!Setter) { 1004 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1005 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1006 if (ObjCImplementationDecl *ImpDecl = 1007 ObjCImplementations[ClassDecl->getIdentifier()]) 1008 Setter = ImpDecl->getInstanceMethod(SetterSel); 1009 } 1010 1011 // FIXME: There are some issues here. First, we are not 1012 // diagnosing accesses to read-only properties because we do not 1013 // know if this is a getter or setter yet. Second, we are 1014 // checking that the type of the setter matches the type we 1015 // expect. 1016 return new ObjCPropertyRefExpr(Getter, Setter, Getter->getResultType(), 1017 MemberLoc, BaseExpr); 1018 } 1019 } 1020 // Handle properties on qualified "id" protocols. 1021 const ObjCQualifiedIdType *QIdTy; 1022 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1023 // Check protocols on qualified interfaces. 1024 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1025 E = QIdTy->qual_end(); I != E; ++I) 1026 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1027 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1028 } 1029 // Handle 'field access' to vectors, such as 'V.xx'. 1030 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1031 // Component access limited to variables (reject vec4.rg.g). 1032 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1033 !isa<ExtVectorElementExpr>(BaseExpr)) 1034 return Diag(MemberLoc, diag::err_ext_vector_component_access, 1035 BaseExpr->getSourceRange()); 1036 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1037 if (ret.isNull()) 1038 return true; 1039 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1040 } 1041 1042 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union, 1043 BaseType.getAsString(), BaseExpr->getSourceRange()); 1044} 1045 1046/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1047/// This provides the location of the left/right parens and a list of comma 1048/// locations. 1049Action::ExprResult Sema:: 1050ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 1051 ExprTy **args, unsigned NumArgs, 1052 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1053 Expr *Fn = static_cast<Expr *>(fn); 1054 Expr **Args = reinterpret_cast<Expr**>(args); 1055 assert(Fn && "no function call expression"); 1056 FunctionDecl *FDecl = NULL; 1057 OverloadedFunctionDecl *Ovl = NULL; 1058 1059 // If we're directly calling a function or a set of overloaded 1060 // functions, get the appropriate declaration. 1061 { 1062 DeclRefExpr *DRExpr = NULL; 1063 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1064 DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()); 1065 else 1066 DRExpr = dyn_cast<DeclRefExpr>(Fn); 1067 1068 if (DRExpr) { 1069 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1070 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1071 } 1072 } 1073 1074 // If we have a set of overloaded functions, perform overload 1075 // resolution to pick the function. 1076 if (Ovl) { 1077 OverloadCandidateSet CandidateSet; 1078 OverloadCandidateSet::iterator Best; 1079 AddOverloadCandidates(Ovl, Args, NumArgs, CandidateSet); 1080 switch (BestViableFunction(CandidateSet, Best)) { 1081 case OR_Success: 1082 { 1083 // Success! Let the remainder of this function build a call to 1084 // the function selected by overload resolution. 1085 FDecl = Best->Function; 1086 Expr *NewFn = new DeclRefExpr(FDecl, FDecl->getType(), 1087 Fn->getSourceRange().getBegin()); 1088 delete Fn; 1089 Fn = NewFn; 1090 } 1091 break; 1092 1093 case OR_No_Viable_Function: 1094 if (CandidateSet.empty()) 1095 Diag(Fn->getSourceRange().getBegin(), 1096 diag::err_ovl_no_viable_function_in_call, Ovl->getName(), 1097 Fn->getSourceRange()); 1098 else { 1099 Diag(Fn->getSourceRange().getBegin(), 1100 diag::err_ovl_no_viable_function_in_call_with_cands, 1101 Ovl->getName(), Fn->getSourceRange()); 1102 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1103 } 1104 return true; 1105 1106 case OR_Ambiguous: 1107 Diag(Fn->getSourceRange().getBegin(), 1108 diag::err_ovl_ambiguous_call, Ovl->getName(), 1109 Fn->getSourceRange()); 1110 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1111 return true; 1112 } 1113 } 1114 1115 // Promote the function operand. 1116 UsualUnaryConversions(Fn); 1117 1118 // Make the call expr early, before semantic checks. This guarantees cleanup 1119 // of arguments and function on error. 1120 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1121 Context.BoolTy, RParenLoc)); 1122 const FunctionType *FuncT; 1123 if (!Fn->getType()->isBlockPointerType()) { 1124 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1125 // have type pointer to function". 1126 const PointerType *PT = Fn->getType()->getAsPointerType(); 1127 if (PT == 0) 1128 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1129 Fn->getSourceRange()); 1130 FuncT = PT->getPointeeType()->getAsFunctionType(); 1131 } else { // This is a block call. 1132 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1133 getAsFunctionType(); 1134 } 1135 if (FuncT == 0) 1136 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1137 Fn->getSourceRange()); 1138 1139 // We know the result type of the call, set it. 1140 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 1141 1142 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1143 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1144 // assignment, to the types of the corresponding parameter, ... 1145 unsigned NumArgsInProto = Proto->getNumArgs(); 1146 unsigned NumArgsToCheck = NumArgs; 1147 1148 // If too few arguments are available (and we don't have default 1149 // arguments for the remaining parameters), don't make the call. 1150 if (NumArgs < NumArgsInProto) { 1151 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 1152 // Use default arguments for missing arguments 1153 NumArgsToCheck = NumArgsInProto; 1154 TheCall->setNumArgs(NumArgsInProto); 1155 } else 1156 return Diag(RParenLoc, 1157 !Fn->getType()->isBlockPointerType() 1158 ? diag::err_typecheck_call_too_few_args 1159 : diag::err_typecheck_block_too_few_args, 1160 Fn->getSourceRange()); 1161 } 1162 1163 // If too many are passed and not variadic, error on the extras and drop 1164 // them. 1165 if (NumArgs > NumArgsInProto) { 1166 if (!Proto->isVariadic()) { 1167 Diag(Args[NumArgsInProto]->getLocStart(), 1168 !Fn->getType()->isBlockPointerType() 1169 ? diag::err_typecheck_call_too_many_args 1170 : diag::err_typecheck_block_too_many_args, 1171 Fn->getSourceRange(), 1172 SourceRange(Args[NumArgsInProto]->getLocStart(), 1173 Args[NumArgs-1]->getLocEnd())); 1174 // This deletes the extra arguments. 1175 TheCall->setNumArgs(NumArgsInProto); 1176 } 1177 NumArgsToCheck = NumArgsInProto; 1178 } 1179 1180 // Continue to check argument types (even if we have too few/many args). 1181 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1182 QualType ProtoArgType = Proto->getArgType(i); 1183 1184 Expr *Arg; 1185 if (i < NumArgs) 1186 Arg = Args[i]; 1187 else 1188 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1189 QualType ArgType = Arg->getType(); 1190 1191 // Pass the argument. 1192 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 1193 return true; 1194 1195 TheCall->setArg(i, Arg); 1196 } 1197 1198 // If this is a variadic call, handle args passed through "...". 1199 if (Proto->isVariadic()) { 1200 // Promote the arguments (C99 6.5.2.2p7). 1201 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1202 Expr *Arg = Args[i]; 1203 DefaultArgumentPromotion(Arg); 1204 TheCall->setArg(i, Arg); 1205 } 1206 } 1207 } else { 1208 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1209 1210 // Promote the arguments (C99 6.5.2.2p6). 1211 for (unsigned i = 0; i != NumArgs; i++) { 1212 Expr *Arg = Args[i]; 1213 DefaultArgumentPromotion(Arg); 1214 TheCall->setArg(i, Arg); 1215 } 1216 } 1217 1218 // Do special checking on direct calls to functions. 1219 if (FDecl) 1220 return CheckFunctionCall(FDecl, TheCall.take()); 1221 1222 return TheCall.take(); 1223} 1224 1225Action::ExprResult Sema:: 1226ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1227 SourceLocation RParenLoc, ExprTy *InitExpr) { 1228 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1229 QualType literalType = QualType::getFromOpaquePtr(Ty); 1230 // FIXME: put back this assert when initializers are worked out. 1231 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1232 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1233 1234 if (literalType->isArrayType()) { 1235 if (literalType->isVariableArrayType()) 1236 return Diag(LParenLoc, 1237 diag::err_variable_object_no_init, 1238 SourceRange(LParenLoc, 1239 literalExpr->getSourceRange().getEnd())); 1240 } else if (literalType->isIncompleteType()) { 1241 return Diag(LParenLoc, 1242 diag::err_typecheck_decl_incomplete_type, 1243 literalType.getAsString(), 1244 SourceRange(LParenLoc, 1245 literalExpr->getSourceRange().getEnd())); 1246 } 1247 1248 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 1249 "temporary")) 1250 return true; 1251 1252 bool isFileScope = !getCurFunctionDecl() && !getCurMethodDecl(); 1253 if (isFileScope) { // 6.5.2.5p3 1254 if (CheckForConstantInitializer(literalExpr, literalType)) 1255 return true; 1256 } 1257 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, 1258 isFileScope); 1259} 1260 1261Action::ExprResult Sema:: 1262ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1263 InitListDesignations &Designators, 1264 SourceLocation RBraceLoc) { 1265 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1266 1267 // Semantic analysis for initializers is done by ActOnDeclarator() and 1268 // CheckInitializer() - it requires knowledge of the object being intialized. 1269 1270 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc, 1271 Designators.hasAnyDesignators()); 1272 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1273 return E; 1274} 1275 1276/// CheckCastTypes - Check type constraints for casting between types. 1277bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1278 UsualUnaryConversions(castExpr); 1279 1280 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1281 // type needs to be scalar. 1282 if (castType->isVoidType()) { 1283 // Cast to void allows any expr type. 1284 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1285 // GCC struct/union extension: allow cast to self. 1286 if (Context.getCanonicalType(castType) != 1287 Context.getCanonicalType(castExpr->getType()) || 1288 (!castType->isStructureType() && !castType->isUnionType())) { 1289 // Reject any other conversions to non-scalar types. 1290 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar, 1291 castType.getAsString(), castExpr->getSourceRange()); 1292 } 1293 1294 // accept this, but emit an ext-warn. 1295 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar, 1296 castType.getAsString(), castExpr->getSourceRange()); 1297 } else if (!castExpr->getType()->isScalarType() && 1298 !castExpr->getType()->isVectorType()) { 1299 return Diag(castExpr->getLocStart(), 1300 diag::err_typecheck_expect_scalar_operand, 1301 castExpr->getType().getAsString(),castExpr->getSourceRange()); 1302 } else if (castExpr->getType()->isVectorType()) { 1303 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1304 return true; 1305 } else if (castType->isVectorType()) { 1306 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1307 return true; 1308 } 1309 return false; 1310} 1311 1312bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1313 assert(VectorTy->isVectorType() && "Not a vector type!"); 1314 1315 if (Ty->isVectorType() || Ty->isIntegerType()) { 1316 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1317 return Diag(R.getBegin(), 1318 Ty->isVectorType() ? 1319 diag::err_invalid_conversion_between_vectors : 1320 diag::err_invalid_conversion_between_vector_and_integer, 1321 VectorTy.getAsString().c_str(), 1322 Ty.getAsString().c_str(), R); 1323 } else 1324 return Diag(R.getBegin(), 1325 diag::err_invalid_conversion_between_vector_and_scalar, 1326 VectorTy.getAsString().c_str(), 1327 Ty.getAsString().c_str(), R); 1328 1329 return false; 1330} 1331 1332Action::ExprResult Sema:: 1333ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1334 SourceLocation RParenLoc, ExprTy *Op) { 1335 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1336 1337 Expr *castExpr = static_cast<Expr*>(Op); 1338 QualType castType = QualType::getFromOpaquePtr(Ty); 1339 1340 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1341 return true; 1342 return new CStyleCastExpr(castType, castExpr, castType, LParenLoc, RParenLoc); 1343} 1344 1345/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1346/// In that case, lex = cond. 1347inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1348 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1349 UsualUnaryConversions(cond); 1350 UsualUnaryConversions(lex); 1351 UsualUnaryConversions(rex); 1352 QualType condT = cond->getType(); 1353 QualType lexT = lex->getType(); 1354 QualType rexT = rex->getType(); 1355 1356 // first, check the condition. 1357 if (!condT->isScalarType()) { // C99 6.5.15p2 1358 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 1359 condT.getAsString()); 1360 return QualType(); 1361 } 1362 1363 // Now check the two expressions. 1364 1365 // If both operands have arithmetic type, do the usual arithmetic conversions 1366 // to find a common type: C99 6.5.15p3,5. 1367 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1368 UsualArithmeticConversions(lex, rex); 1369 return lex->getType(); 1370 } 1371 1372 // If both operands are the same structure or union type, the result is that 1373 // type. 1374 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1375 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1376 if (LHSRT->getDecl() == RHSRT->getDecl()) 1377 // "If both the operands have structure or union type, the result has 1378 // that type." This implies that CV qualifiers are dropped. 1379 return lexT.getUnqualifiedType(); 1380 } 1381 1382 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1383 // The following || allows only one side to be void (a GCC-ism). 1384 if (lexT->isVoidType() || rexT->isVoidType()) { 1385 if (!lexT->isVoidType()) 1386 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 1387 rex->getSourceRange()); 1388 if (!rexT->isVoidType()) 1389 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 1390 lex->getSourceRange()); 1391 ImpCastExprToType(lex, Context.VoidTy); 1392 ImpCastExprToType(rex, Context.VoidTy); 1393 return Context.VoidTy; 1394 } 1395 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1396 // the type of the other operand." 1397 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1398 Context.isObjCObjectPointerType(lexT)) && 1399 rex->isNullPointerConstant(Context)) { 1400 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1401 return lexT; 1402 } 1403 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1404 Context.isObjCObjectPointerType(rexT)) && 1405 lex->isNullPointerConstant(Context)) { 1406 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1407 return rexT; 1408 } 1409 // Handle the case where both operands are pointers before we handle null 1410 // pointer constants in case both operands are null pointer constants. 1411 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1412 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1413 // get the "pointed to" types 1414 QualType lhptee = LHSPT->getPointeeType(); 1415 QualType rhptee = RHSPT->getPointeeType(); 1416 1417 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1418 if (lhptee->isVoidType() && 1419 rhptee->isIncompleteOrObjectType()) { 1420 // Figure out necessary qualifiers (C99 6.5.15p6) 1421 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1422 QualType destType = Context.getPointerType(destPointee); 1423 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1424 ImpCastExprToType(rex, destType); // promote to void* 1425 return destType; 1426 } 1427 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1428 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1429 QualType destType = Context.getPointerType(destPointee); 1430 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1431 ImpCastExprToType(rex, destType); // promote to void* 1432 return destType; 1433 } 1434 1435 QualType compositeType = lexT; 1436 1437 // If either type is an Objective-C object type then check 1438 // compatibility according to Objective-C. 1439 if (Context.isObjCObjectPointerType(lexT) || 1440 Context.isObjCObjectPointerType(rexT)) { 1441 // If both operands are interfaces and either operand can be 1442 // assigned to the other, use that type as the composite 1443 // type. This allows 1444 // xxx ? (A*) a : (B*) b 1445 // where B is a subclass of A. 1446 // 1447 // Additionally, as for assignment, if either type is 'id' 1448 // allow silent coercion. Finally, if the types are 1449 // incompatible then make sure to use 'id' as the composite 1450 // type so the result is acceptable for sending messages to. 1451 1452 // FIXME: This code should not be localized to here. Also this 1453 // should use a compatible check instead of abusing the 1454 // canAssignObjCInterfaces code. 1455 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1456 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1457 if (LHSIface && RHSIface && 1458 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1459 compositeType = lexT; 1460 } else if (LHSIface && RHSIface && 1461 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1462 compositeType = rexT; 1463 } else if (Context.isObjCIdType(lhptee) || 1464 Context.isObjCIdType(rhptee)) { 1465 // FIXME: This code looks wrong, because isObjCIdType checks 1466 // the struct but getObjCIdType returns the pointer to 1467 // struct. This is horrible and should be fixed. 1468 compositeType = Context.getObjCIdType(); 1469 } else { 1470 QualType incompatTy = Context.getObjCIdType(); 1471 ImpCastExprToType(lex, incompatTy); 1472 ImpCastExprToType(rex, incompatTy); 1473 return incompatTy; 1474 } 1475 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1476 rhptee.getUnqualifiedType())) { 1477 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 1478 lexT.getAsString(), rexT.getAsString(), 1479 lex->getSourceRange(), rex->getSourceRange()); 1480 // In this situation, we assume void* type. No especially good 1481 // reason, but this is what gcc does, and we do have to pick 1482 // to get a consistent AST. 1483 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1484 ImpCastExprToType(lex, incompatTy); 1485 ImpCastExprToType(rex, incompatTy); 1486 return incompatTy; 1487 } 1488 // The pointer types are compatible. 1489 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1490 // differently qualified versions of compatible types, the result type is 1491 // a pointer to an appropriately qualified version of the *composite* 1492 // type. 1493 // FIXME: Need to calculate the composite type. 1494 // FIXME: Need to add qualifiers 1495 ImpCastExprToType(lex, compositeType); 1496 ImpCastExprToType(rex, compositeType); 1497 return compositeType; 1498 } 1499 } 1500 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1501 // evaluates to "struct objc_object *" (and is handled above when comparing 1502 // id with statically typed objects). 1503 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1504 // GCC allows qualified id and any Objective-C type to devolve to 1505 // id. Currently localizing to here until clear this should be 1506 // part of ObjCQualifiedIdTypesAreCompatible. 1507 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1508 (lexT->isObjCQualifiedIdType() && 1509 Context.isObjCObjectPointerType(rexT)) || 1510 (rexT->isObjCQualifiedIdType() && 1511 Context.isObjCObjectPointerType(lexT))) { 1512 // FIXME: This is not the correct composite type. This only 1513 // happens to work because id can more or less be used anywhere, 1514 // however this may change the type of method sends. 1515 // FIXME: gcc adds some type-checking of the arguments and emits 1516 // (confusing) incompatible comparison warnings in some 1517 // cases. Investigate. 1518 QualType compositeType = Context.getObjCIdType(); 1519 ImpCastExprToType(lex, compositeType); 1520 ImpCastExprToType(rex, compositeType); 1521 return compositeType; 1522 } 1523 } 1524 1525 // Selection between block pointer types is ok as long as they are the same. 1526 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1527 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1528 return lexT; 1529 1530 // Otherwise, the operands are not compatible. 1531 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 1532 lexT.getAsString(), rexT.getAsString(), 1533 lex->getSourceRange(), rex->getSourceRange()); 1534 return QualType(); 1535} 1536 1537/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1538/// in the case of a the GNU conditional expr extension. 1539Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1540 SourceLocation ColonLoc, 1541 ExprTy *Cond, ExprTy *LHS, 1542 ExprTy *RHS) { 1543 Expr *CondExpr = (Expr *) Cond; 1544 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1545 1546 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1547 // was the condition. 1548 bool isLHSNull = LHSExpr == 0; 1549 if (isLHSNull) 1550 LHSExpr = CondExpr; 1551 1552 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1553 RHSExpr, QuestionLoc); 1554 if (result.isNull()) 1555 return true; 1556 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1557 RHSExpr, result); 1558} 1559 1560 1561// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1562// being closely modeled after the C99 spec:-). The odd characteristic of this 1563// routine is it effectively iqnores the qualifiers on the top level pointee. 1564// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1565// FIXME: add a couple examples in this comment. 1566Sema::AssignConvertType 1567Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1568 QualType lhptee, rhptee; 1569 1570 // get the "pointed to" type (ignoring qualifiers at the top level) 1571 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1572 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1573 1574 // make sure we operate on the canonical type 1575 lhptee = Context.getCanonicalType(lhptee); 1576 rhptee = Context.getCanonicalType(rhptee); 1577 1578 AssignConvertType ConvTy = Compatible; 1579 1580 // C99 6.5.16.1p1: This following citation is common to constraints 1581 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1582 // qualifiers of the type *pointed to* by the right; 1583 // FIXME: Handle ASQualType 1584 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 1585 ConvTy = CompatiblePointerDiscardsQualifiers; 1586 1587 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1588 // incomplete type and the other is a pointer to a qualified or unqualified 1589 // version of void... 1590 if (lhptee->isVoidType()) { 1591 if (rhptee->isIncompleteOrObjectType()) 1592 return ConvTy; 1593 1594 // As an extension, we allow cast to/from void* to function pointer. 1595 assert(rhptee->isFunctionType()); 1596 return FunctionVoidPointer; 1597 } 1598 1599 if (rhptee->isVoidType()) { 1600 if (lhptee->isIncompleteOrObjectType()) 1601 return ConvTy; 1602 1603 // As an extension, we allow cast to/from void* to function pointer. 1604 assert(lhptee->isFunctionType()); 1605 return FunctionVoidPointer; 1606 } 1607 1608 // Check for ObjC interfaces 1609 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1610 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1611 if (LHSIface && RHSIface && 1612 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1613 return ConvTy; 1614 1615 // ID acts sort of like void* for ObjC interfaces 1616 if (LHSIface && Context.isObjCIdType(rhptee)) 1617 return ConvTy; 1618 if (RHSIface && Context.isObjCIdType(lhptee)) 1619 return ConvTy; 1620 1621 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1622 // unqualified versions of compatible types, ... 1623 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1624 rhptee.getUnqualifiedType())) 1625 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1626 return ConvTy; 1627} 1628 1629/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1630/// block pointer types are compatible or whether a block and normal pointer 1631/// are compatible. It is more restrict than comparing two function pointer 1632// types. 1633Sema::AssignConvertType 1634Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1635 QualType rhsType) { 1636 QualType lhptee, rhptee; 1637 1638 // get the "pointed to" type (ignoring qualifiers at the top level) 1639 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1640 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1641 1642 // make sure we operate on the canonical type 1643 lhptee = Context.getCanonicalType(lhptee); 1644 rhptee = Context.getCanonicalType(rhptee); 1645 1646 AssignConvertType ConvTy = Compatible; 1647 1648 // For blocks we enforce that qualifiers are identical. 1649 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1650 ConvTy = CompatiblePointerDiscardsQualifiers; 1651 1652 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1653 return IncompatibleBlockPointer; 1654 return ConvTy; 1655} 1656 1657/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1658/// has code to accommodate several GCC extensions when type checking 1659/// pointers. Here are some objectionable examples that GCC considers warnings: 1660/// 1661/// int a, *pint; 1662/// short *pshort; 1663/// struct foo *pfoo; 1664/// 1665/// pint = pshort; // warning: assignment from incompatible pointer type 1666/// a = pint; // warning: assignment makes integer from pointer without a cast 1667/// pint = a; // warning: assignment makes pointer from integer without a cast 1668/// pint = pfoo; // warning: assignment from incompatible pointer type 1669/// 1670/// As a result, the code for dealing with pointers is more complex than the 1671/// C99 spec dictates. 1672/// 1673Sema::AssignConvertType 1674Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1675 // Get canonical types. We're not formatting these types, just comparing 1676 // them. 1677 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1678 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1679 1680 if (lhsType == rhsType) 1681 return Compatible; // Common case: fast path an exact match. 1682 1683 // If the left-hand side is a reference type, then we are in a 1684 // (rare!) case where we've allowed the use of references in C, 1685 // e.g., as a parameter type in a built-in function. In this case, 1686 // just make sure that the type referenced is compatible with the 1687 // right-hand side type. The caller is responsible for adjusting 1688 // lhsType so that the resulting expression does not have reference 1689 // type. 1690 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 1691 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 1692 return Compatible; 1693 return Incompatible; 1694 } 1695 1696 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1697 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1698 return Compatible; 1699 // Relax integer conversions like we do for pointers below. 1700 if (rhsType->isIntegerType()) 1701 return IntToPointer; 1702 if (lhsType->isIntegerType()) 1703 return PointerToInt; 1704 return IncompatibleObjCQualifiedId; 1705 } 1706 1707 if (lhsType->isVectorType() || rhsType->isVectorType()) { 1708 // For ExtVector, allow vector splats; float -> <n x float> 1709 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 1710 if (LV->getElementType() == rhsType) 1711 return Compatible; 1712 1713 // If we are allowing lax vector conversions, and LHS and RHS are both 1714 // vectors, the total size only needs to be the same. This is a bitcast; 1715 // no bits are changed but the result type is different. 1716 if (getLangOptions().LaxVectorConversions && 1717 lhsType->isVectorType() && rhsType->isVectorType()) { 1718 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1719 return Compatible; 1720 } 1721 return Incompatible; 1722 } 1723 1724 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1725 return Compatible; 1726 1727 if (isa<PointerType>(lhsType)) { 1728 if (rhsType->isIntegerType()) 1729 return IntToPointer; 1730 1731 if (isa<PointerType>(rhsType)) 1732 return CheckPointerTypesForAssignment(lhsType, rhsType); 1733 1734 if (rhsType->getAsBlockPointerType()) { 1735 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1736 return BlockVoidPointer; 1737 1738 // Treat block pointers as objects. 1739 if (getLangOptions().ObjC1 && 1740 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 1741 return Compatible; 1742 } 1743 return Incompatible; 1744 } 1745 1746 if (isa<BlockPointerType>(lhsType)) { 1747 if (rhsType->isIntegerType()) 1748 return IntToPointer; 1749 1750 // Treat block pointers as objects. 1751 if (getLangOptions().ObjC1 && 1752 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 1753 return Compatible; 1754 1755 if (rhsType->isBlockPointerType()) 1756 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 1757 1758 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 1759 if (RHSPT->getPointeeType()->isVoidType()) 1760 return BlockVoidPointer; 1761 } 1762 return Incompatible; 1763 } 1764 1765 if (isa<PointerType>(rhsType)) { 1766 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1767 if (lhsType == Context.BoolTy) 1768 return Compatible; 1769 1770 if (lhsType->isIntegerType()) 1771 return PointerToInt; 1772 1773 if (isa<PointerType>(lhsType)) 1774 return CheckPointerTypesForAssignment(lhsType, rhsType); 1775 1776 if (isa<BlockPointerType>(lhsType) && 1777 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1778 return BlockVoidPointer; 1779 return Incompatible; 1780 } 1781 1782 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1783 if (Context.typesAreCompatible(lhsType, rhsType)) 1784 return Compatible; 1785 } 1786 return Incompatible; 1787} 1788 1789Sema::AssignConvertType 1790Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1791 if (getLangOptions().CPlusPlus) { 1792 if (!lhsType->isRecordType()) { 1793 // C++ 5.17p3: If the left operand is not of class type, the 1794 // expression is implicitly converted (C++ 4) to the 1795 // cv-unqualified type of the left operand. 1796 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType())) 1797 return Incompatible; 1798 else 1799 return Compatible; 1800 } 1801 1802 // FIXME: Currently, we fall through and treat C++ classes like C 1803 // structures. 1804 } 1805 1806 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1807 // a null pointer constant. 1808 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 1809 lhsType->isBlockPointerType()) 1810 && rExpr->isNullPointerConstant(Context)) { 1811 ImpCastExprToType(rExpr, lhsType); 1812 return Compatible; 1813 } 1814 1815 // We don't allow conversion of non-null-pointer constants to integers. 1816 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 1817 return IntToBlockPointer; 1818 1819 // This check seems unnatural, however it is necessary to ensure the proper 1820 // conversion of functions/arrays. If the conversion were done for all 1821 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1822 // expressions that surpress this implicit conversion (&, sizeof). 1823 // 1824 // Suppress this for references: C++ 8.5.3p5. 1825 if (!lhsType->isReferenceType()) 1826 DefaultFunctionArrayConversion(rExpr); 1827 1828 Sema::AssignConvertType result = 1829 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1830 1831 // C99 6.5.16.1p2: The value of the right operand is converted to the 1832 // type of the assignment expression. 1833 // CheckAssignmentConstraints allows the left-hand side to be a reference, 1834 // so that we can use references in built-in functions even in C. 1835 // The getNonReferenceType() call makes sure that the resulting expression 1836 // does not have reference type. 1837 if (rExpr->getType() != lhsType) 1838 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 1839 return result; 1840} 1841 1842Sema::AssignConvertType 1843Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1844 return CheckAssignmentConstraints(lhsType, rhsType); 1845} 1846 1847QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1848 Diag(loc, diag::err_typecheck_invalid_operands, 1849 lex->getType().getAsString(), rex->getType().getAsString(), 1850 lex->getSourceRange(), rex->getSourceRange()); 1851 return QualType(); 1852} 1853 1854inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1855 Expr *&rex) { 1856 // For conversion purposes, we ignore any qualifiers. 1857 // For example, "const float" and "float" are equivalent. 1858 QualType lhsType = 1859 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 1860 QualType rhsType = 1861 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 1862 1863 // If the vector types are identical, return. 1864 if (lhsType == rhsType) 1865 return lhsType; 1866 1867 // Handle the case of a vector & extvector type of the same size and element 1868 // type. It would be nice if we only had one vector type someday. 1869 if (getLangOptions().LaxVectorConversions) 1870 if (const VectorType *LV = lhsType->getAsVectorType()) 1871 if (const VectorType *RV = rhsType->getAsVectorType()) 1872 if (LV->getElementType() == RV->getElementType() && 1873 LV->getNumElements() == RV->getNumElements()) 1874 return lhsType->isExtVectorType() ? lhsType : rhsType; 1875 1876 // If the lhs is an extended vector and the rhs is a scalar of the same type 1877 // or a literal, promote the rhs to the vector type. 1878 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1879 QualType eltType = V->getElementType(); 1880 1881 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 1882 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 1883 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 1884 ImpCastExprToType(rex, lhsType); 1885 return lhsType; 1886 } 1887 } 1888 1889 // If the rhs is an extended vector and the lhs is a scalar of the same type, 1890 // promote the lhs to the vector type. 1891 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1892 QualType eltType = V->getElementType(); 1893 1894 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 1895 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 1896 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 1897 ImpCastExprToType(lex, rhsType); 1898 return rhsType; 1899 } 1900 } 1901 1902 // You cannot convert between vector values of different size. 1903 Diag(loc, diag::err_typecheck_vector_not_convertable, 1904 lex->getType().getAsString(), rex->getType().getAsString(), 1905 lex->getSourceRange(), rex->getSourceRange()); 1906 return QualType(); 1907} 1908 1909inline QualType Sema::CheckMultiplyDivideOperands( 1910 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1911{ 1912 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1913 1914 if (lhsType->isVectorType() || rhsType->isVectorType()) 1915 return CheckVectorOperands(loc, lex, rex); 1916 1917 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1918 1919 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1920 return compType; 1921 return InvalidOperands(loc, lex, rex); 1922} 1923 1924inline QualType Sema::CheckRemainderOperands( 1925 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1926{ 1927 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1928 1929 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1930 1931 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1932 return compType; 1933 return InvalidOperands(loc, lex, rex); 1934} 1935 1936inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1937 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1938{ 1939 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1940 return CheckVectorOperands(loc, lex, rex); 1941 1942 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1943 1944 // handle the common case first (both operands are arithmetic). 1945 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1946 return compType; 1947 1948 // Put any potential pointer into PExp 1949 Expr* PExp = lex, *IExp = rex; 1950 if (IExp->getType()->isPointerType()) 1951 std::swap(PExp, IExp); 1952 1953 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1954 if (IExp->getType()->isIntegerType()) { 1955 // Check for arithmetic on pointers to incomplete types 1956 if (!PTy->getPointeeType()->isObjectType()) { 1957 if (PTy->getPointeeType()->isVoidType()) { 1958 Diag(loc, diag::ext_gnu_void_ptr, 1959 lex->getSourceRange(), rex->getSourceRange()); 1960 } else { 1961 Diag(loc, diag::err_typecheck_arithmetic_incomplete_type, 1962 lex->getType().getAsString(), lex->getSourceRange()); 1963 return QualType(); 1964 } 1965 } 1966 return PExp->getType(); 1967 } 1968 } 1969 1970 return InvalidOperands(loc, lex, rex); 1971} 1972 1973// C99 6.5.6 1974QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1975 SourceLocation loc, bool isCompAssign) { 1976 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1977 return CheckVectorOperands(loc, lex, rex); 1978 1979 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1980 1981 // Enforce type constraints: C99 6.5.6p3. 1982 1983 // Handle the common case first (both operands are arithmetic). 1984 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1985 return compType; 1986 1987 // Either ptr - int or ptr - ptr. 1988 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1989 QualType lpointee = LHSPTy->getPointeeType(); 1990 1991 // The LHS must be an object type, not incomplete, function, etc. 1992 if (!lpointee->isObjectType()) { 1993 // Handle the GNU void* extension. 1994 if (lpointee->isVoidType()) { 1995 Diag(loc, diag::ext_gnu_void_ptr, 1996 lex->getSourceRange(), rex->getSourceRange()); 1997 } else { 1998 Diag(loc, diag::err_typecheck_sub_ptr_object, 1999 lex->getType().getAsString(), lex->getSourceRange()); 2000 return QualType(); 2001 } 2002 } 2003 2004 // The result type of a pointer-int computation is the pointer type. 2005 if (rex->getType()->isIntegerType()) 2006 return lex->getType(); 2007 2008 // Handle pointer-pointer subtractions. 2009 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 2010 QualType rpointee = RHSPTy->getPointeeType(); 2011 2012 // RHS must be an object type, unless void (GNU). 2013 if (!rpointee->isObjectType()) { 2014 // Handle the GNU void* extension. 2015 if (rpointee->isVoidType()) { 2016 if (!lpointee->isVoidType()) 2017 Diag(loc, diag::ext_gnu_void_ptr, 2018 lex->getSourceRange(), rex->getSourceRange()); 2019 } else { 2020 Diag(loc, diag::err_typecheck_sub_ptr_object, 2021 rex->getType().getAsString(), rex->getSourceRange()); 2022 return QualType(); 2023 } 2024 } 2025 2026 // Pointee types must be compatible. 2027 if (!Context.typesAreCompatible( 2028 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2029 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2030 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 2031 lex->getType().getAsString(), rex->getType().getAsString(), 2032 lex->getSourceRange(), rex->getSourceRange()); 2033 return QualType(); 2034 } 2035 2036 return Context.getPointerDiffType(); 2037 } 2038 } 2039 2040 return InvalidOperands(loc, lex, rex); 2041} 2042 2043// C99 6.5.7 2044QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 2045 bool isCompAssign) { 2046 // C99 6.5.7p2: Each of the operands shall have integer type. 2047 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2048 return InvalidOperands(loc, lex, rex); 2049 2050 // Shifts don't perform usual arithmetic conversions, they just do integer 2051 // promotions on each operand. C99 6.5.7p3 2052 if (!isCompAssign) 2053 UsualUnaryConversions(lex); 2054 UsualUnaryConversions(rex); 2055 2056 // "The type of the result is that of the promoted left operand." 2057 return lex->getType(); 2058} 2059 2060static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 2061 ASTContext& Context) { 2062 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2063 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2064 // ID acts sort of like void* for ObjC interfaces 2065 if (LHSIface && Context.isObjCIdType(RHS)) 2066 return true; 2067 if (RHSIface && Context.isObjCIdType(LHS)) 2068 return true; 2069 if (!LHSIface || !RHSIface) 2070 return false; 2071 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 2072 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 2073} 2074 2075// C99 6.5.8 2076QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 2077 bool isRelational) { 2078 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2079 return CheckVectorCompareOperands(lex, rex, loc, isRelational); 2080 2081 // C99 6.5.8p3 / C99 6.5.9p4 2082 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2083 UsualArithmeticConversions(lex, rex); 2084 else { 2085 UsualUnaryConversions(lex); 2086 UsualUnaryConversions(rex); 2087 } 2088 QualType lType = lex->getType(); 2089 QualType rType = rex->getType(); 2090 2091 // For non-floating point types, check for self-comparisons of the form 2092 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2093 // often indicate logic errors in the program. 2094 if (!lType->isFloatingType()) { 2095 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2096 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2097 if (DRL->getDecl() == DRR->getDecl()) 2098 Diag(loc, diag::warn_selfcomparison); 2099 } 2100 2101 if (isRelational) { 2102 if (lType->isRealType() && rType->isRealType()) 2103 return Context.IntTy; 2104 } else { 2105 // Check for comparisons of floating point operands using != and ==. 2106 if (lType->isFloatingType()) { 2107 assert (rType->isFloatingType()); 2108 CheckFloatComparison(loc,lex,rex); 2109 } 2110 2111 if (lType->isArithmeticType() && rType->isArithmeticType()) 2112 return Context.IntTy; 2113 } 2114 2115 bool LHSIsNull = lex->isNullPointerConstant(Context); 2116 bool RHSIsNull = rex->isNullPointerConstant(Context); 2117 2118 // All of the following pointer related warnings are GCC extensions, except 2119 // when handling null pointer constants. One day, we can consider making them 2120 // errors (when -pedantic-errors is enabled). 2121 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2122 QualType LCanPointeeTy = 2123 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2124 QualType RCanPointeeTy = 2125 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2126 2127 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2128 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2129 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2130 RCanPointeeTy.getUnqualifiedType()) && 2131 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2132 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2133 lType.getAsString(), rType.getAsString(), 2134 lex->getSourceRange(), rex->getSourceRange()); 2135 } 2136 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2137 return Context.IntTy; 2138 } 2139 // Handle block pointer types. 2140 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2141 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2142 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2143 2144 if (!LHSIsNull && !RHSIsNull && 2145 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2146 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2147 lType.getAsString(), rType.getAsString(), 2148 lex->getSourceRange(), rex->getSourceRange()); 2149 } 2150 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2151 return Context.IntTy; 2152 } 2153 // Allow block pointers to be compared with null pointer constants. 2154 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2155 (lType->isPointerType() && rType->isBlockPointerType())) { 2156 if (!LHSIsNull && !RHSIsNull) { 2157 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2158 lType.getAsString(), rType.getAsString(), 2159 lex->getSourceRange(), rex->getSourceRange()); 2160 } 2161 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2162 return Context.IntTy; 2163 } 2164 2165 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2166 if (lType->isPointerType() || rType->isPointerType()) { 2167 if (!Context.typesAreCompatible(lType, rType)) { 2168 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2169 lType.getAsString(), rType.getAsString(), 2170 lex->getSourceRange(), rex->getSourceRange()); 2171 ImpCastExprToType(rex, lType); 2172 return Context.IntTy; 2173 } 2174 ImpCastExprToType(rex, lType); 2175 return Context.IntTy; 2176 } 2177 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2178 ImpCastExprToType(rex, lType); 2179 return Context.IntTy; 2180 } else { 2181 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2182 Diag(loc, diag::warn_incompatible_qualified_id_operands, 2183 lType.getAsString(), rType.getAsString(), 2184 lex->getSourceRange(), rex->getSourceRange()); 2185 ImpCastExprToType(rex, lType); 2186 return Context.IntTy; 2187 } 2188 } 2189 } 2190 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2191 rType->isIntegerType()) { 2192 if (!RHSIsNull) 2193 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2194 lType.getAsString(), rType.getAsString(), 2195 lex->getSourceRange(), rex->getSourceRange()); 2196 ImpCastExprToType(rex, lType); // promote the integer to pointer 2197 return Context.IntTy; 2198 } 2199 if (lType->isIntegerType() && 2200 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2201 if (!LHSIsNull) 2202 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2203 lType.getAsString(), rType.getAsString(), 2204 lex->getSourceRange(), rex->getSourceRange()); 2205 ImpCastExprToType(lex, rType); // promote the integer to pointer 2206 return Context.IntTy; 2207 } 2208 // Handle block pointers. 2209 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2210 if (!RHSIsNull) 2211 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2212 lType.getAsString(), rType.getAsString(), 2213 lex->getSourceRange(), rex->getSourceRange()); 2214 ImpCastExprToType(rex, lType); // promote the integer to pointer 2215 return Context.IntTy; 2216 } 2217 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2218 if (!LHSIsNull) 2219 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2220 lType.getAsString(), rType.getAsString(), 2221 lex->getSourceRange(), rex->getSourceRange()); 2222 ImpCastExprToType(lex, rType); // promote the integer to pointer 2223 return Context.IntTy; 2224 } 2225 return InvalidOperands(loc, lex, rex); 2226} 2227 2228/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2229/// operates on extended vector types. Instead of producing an IntTy result, 2230/// like a scalar comparison, a vector comparison produces a vector of integer 2231/// types. 2232QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2233 SourceLocation loc, 2234 bool isRelational) { 2235 // Check to make sure we're operating on vectors of the same type and width, 2236 // Allowing one side to be a scalar of element type. 2237 QualType vType = CheckVectorOperands(loc, lex, rex); 2238 if (vType.isNull()) 2239 return vType; 2240 2241 QualType lType = lex->getType(); 2242 QualType rType = rex->getType(); 2243 2244 // For non-floating point types, check for self-comparisons of the form 2245 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2246 // often indicate logic errors in the program. 2247 if (!lType->isFloatingType()) { 2248 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2249 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2250 if (DRL->getDecl() == DRR->getDecl()) 2251 Diag(loc, diag::warn_selfcomparison); 2252 } 2253 2254 // Check for comparisons of floating point operands using != and ==. 2255 if (!isRelational && lType->isFloatingType()) { 2256 assert (rType->isFloatingType()); 2257 CheckFloatComparison(loc,lex,rex); 2258 } 2259 2260 // Return the type for the comparison, which is the same as vector type for 2261 // integer vectors, or an integer type of identical size and number of 2262 // elements for floating point vectors. 2263 if (lType->isIntegerType()) 2264 return lType; 2265 2266 const VectorType *VTy = lType->getAsVectorType(); 2267 2268 // FIXME: need to deal with non-32b int / non-64b long long 2269 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2270 if (TypeSize == 32) { 2271 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2272 } 2273 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2274 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2275} 2276 2277inline QualType Sema::CheckBitwiseOperands( 2278 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 2279{ 2280 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2281 return CheckVectorOperands(loc, lex, rex); 2282 2283 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2284 2285 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2286 return compType; 2287 return InvalidOperands(loc, lex, rex); 2288} 2289 2290inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2291 Expr *&lex, Expr *&rex, SourceLocation loc) 2292{ 2293 UsualUnaryConversions(lex); 2294 UsualUnaryConversions(rex); 2295 2296 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2297 return Context.IntTy; 2298 return InvalidOperands(loc, lex, rex); 2299} 2300 2301inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 2302 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 2303{ 2304 QualType lhsType = lex->getType(); 2305 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 2306 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(Context); 2307 2308 switch (mlval) { // C99 6.5.16p2 2309 case Expr::MLV_Valid: 2310 break; 2311 case Expr::MLV_ConstQualified: 2312 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 2313 return QualType(); 2314 case Expr::MLV_ArrayType: 2315 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 2316 lhsType.getAsString(), lex->getSourceRange()); 2317 return QualType(); 2318 case Expr::MLV_NotObjectType: 2319 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 2320 lhsType.getAsString(), lex->getSourceRange()); 2321 return QualType(); 2322 case Expr::MLV_InvalidExpression: 2323 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 2324 lex->getSourceRange()); 2325 return QualType(); 2326 case Expr::MLV_IncompleteType: 2327 case Expr::MLV_IncompleteVoidType: 2328 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 2329 lhsType.getAsString(), lex->getSourceRange()); 2330 return QualType(); 2331 case Expr::MLV_DuplicateVectorComponents: 2332 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 2333 lex->getSourceRange()); 2334 return QualType(); 2335 case Expr::MLV_NotBlockQualified: 2336 Diag(loc, diag::err_block_decl_ref_not_modifiable_lvalue, 2337 lex->getSourceRange()); 2338 return QualType(); 2339 } 2340 2341 AssignConvertType ConvTy; 2342 if (compoundType.isNull()) { 2343 // Simple assignment "x = y". 2344 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 2345 2346 // If the RHS is a unary plus or minus, check to see if they = and + are 2347 // right next to each other. If so, the user may have typo'd "x =+ 4" 2348 // instead of "x += 4". 2349 Expr *RHSCheck = rex; 2350 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2351 RHSCheck = ICE->getSubExpr(); 2352 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2353 if ((UO->getOpcode() == UnaryOperator::Plus || 2354 UO->getOpcode() == UnaryOperator::Minus) && 2355 loc.isFileID() && UO->getOperatorLoc().isFileID() && 2356 // Only if the two operators are exactly adjacent. 2357 loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2358 Diag(loc, diag::warn_not_compound_assign, 2359 UO->getOpcode() == UnaryOperator::Plus ? "+" : "-", 2360 SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc())); 2361 } 2362 } else { 2363 // Compound assignment "x += y" 2364 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 2365 } 2366 2367 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 2368 rex, "assigning")) 2369 return QualType(); 2370 2371 // C99 6.5.16p3: The type of an assignment expression is the type of the 2372 // left operand unless the left operand has qualified type, in which case 2373 // it is the unqualified version of the type of the left operand. 2374 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2375 // is converted to the type of the assignment expression (above). 2376 // C++ 5.17p1: the type of the assignment expression is that of its left 2377 // oprdu. 2378 return lhsType.getUnqualifiedType(); 2379} 2380 2381inline QualType Sema::CheckCommaOperands( // C99 6.5.17 2382 Expr *&lex, Expr *&rex, SourceLocation loc) { 2383 2384 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2385 DefaultFunctionArrayConversion(rex); 2386 return rex->getType(); 2387} 2388 2389/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2390/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2391QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 2392 QualType resType = op->getType(); 2393 assert(!resType.isNull() && "no type for increment/decrement expression"); 2394 2395 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2396 if (const PointerType *pt = resType->getAsPointerType()) { 2397 if (pt->getPointeeType()->isVoidType()) { 2398 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 2399 } else if (!pt->getPointeeType()->isObjectType()) { 2400 // C99 6.5.2.4p2, 6.5.6p2 2401 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 2402 resType.getAsString(), op->getSourceRange()); 2403 return QualType(); 2404 } 2405 } else if (!resType->isRealType()) { 2406 if (resType->isComplexType()) 2407 // C99 does not support ++/-- on complex types. 2408 Diag(OpLoc, diag::ext_integer_increment_complex, 2409 resType.getAsString(), op->getSourceRange()); 2410 else { 2411 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 2412 resType.getAsString(), op->getSourceRange()); 2413 return QualType(); 2414 } 2415 } 2416 // At this point, we know we have a real, complex or pointer type. 2417 // Now make sure the operand is a modifiable lvalue. 2418 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(Context); 2419 if (mlval != Expr::MLV_Valid) { 2420 // FIXME: emit a more precise diagnostic... 2421 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 2422 op->getSourceRange()); 2423 return QualType(); 2424 } 2425 return resType; 2426} 2427 2428/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2429/// This routine allows us to typecheck complex/recursive expressions 2430/// where the declaration is needed for type checking. We only need to 2431/// handle cases when the expression references a function designator 2432/// or is an lvalue. Here are some examples: 2433/// - &(x) => x 2434/// - &*****f => f for f a function designator. 2435/// - &s.xx => s 2436/// - &s.zz[1].yy -> s, if zz is an array 2437/// - *(x + 1) -> x, if x is an array 2438/// - &"123"[2] -> 0 2439/// - & __real__ x -> x 2440static NamedDecl *getPrimaryDecl(Expr *E) { 2441 switch (E->getStmtClass()) { 2442 case Stmt::DeclRefExprClass: 2443 return cast<DeclRefExpr>(E)->getDecl(); 2444 case Stmt::MemberExprClass: 2445 // Fields cannot be declared with a 'register' storage class. 2446 // &X->f is always ok, even if X is declared register. 2447 if (cast<MemberExpr>(E)->isArrow()) 2448 return 0; 2449 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2450 case Stmt::ArraySubscriptExprClass: { 2451 // &X[4] and &4[X] refers to X if X is not a pointer. 2452 2453 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2454 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 2455 if (!VD || VD->getType()->isPointerType()) 2456 return 0; 2457 else 2458 return VD; 2459 } 2460 case Stmt::UnaryOperatorClass: { 2461 UnaryOperator *UO = cast<UnaryOperator>(E); 2462 2463 switch(UO->getOpcode()) { 2464 case UnaryOperator::Deref: { 2465 // *(X + 1) refers to X if X is not a pointer. 2466 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 2467 ValueDecl *VD = dyn_cast<ValueDecl>(D); 2468 if (!VD || VD->getType()->isPointerType()) 2469 return 0; 2470 return VD; 2471 } 2472 return 0; 2473 } 2474 case UnaryOperator::Real: 2475 case UnaryOperator::Imag: 2476 case UnaryOperator::Extension: 2477 return getPrimaryDecl(UO->getSubExpr()); 2478 default: 2479 return 0; 2480 } 2481 } 2482 case Stmt::BinaryOperatorClass: { 2483 BinaryOperator *BO = cast<BinaryOperator>(E); 2484 2485 // Handle cases involving pointer arithmetic. The result of an 2486 // Assign or AddAssign is not an lvalue so they can be ignored. 2487 2488 // (x + n) or (n + x) => x 2489 if (BO->getOpcode() == BinaryOperator::Add) { 2490 if (BO->getLHS()->getType()->isPointerType()) { 2491 return getPrimaryDecl(BO->getLHS()); 2492 } else if (BO->getRHS()->getType()->isPointerType()) { 2493 return getPrimaryDecl(BO->getRHS()); 2494 } 2495 } 2496 2497 return 0; 2498 } 2499 case Stmt::ParenExprClass: 2500 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2501 case Stmt::ImplicitCastExprClass: 2502 // &X[4] when X is an array, has an implicit cast from array to pointer. 2503 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2504 default: 2505 return 0; 2506 } 2507} 2508 2509/// CheckAddressOfOperand - The operand of & must be either a function 2510/// designator or an lvalue designating an object. If it is an lvalue, the 2511/// object cannot be declared with storage class register or be a bit field. 2512/// Note: The usual conversions are *not* applied to the operand of the & 2513/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2514/// In C++, the operand might be an overloaded function name, in which case 2515/// we allow the '&' but retain the overloaded-function type. 2516QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2517 if (getLangOptions().C99) { 2518 // Implement C99-only parts of addressof rules. 2519 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2520 if (uOp->getOpcode() == UnaryOperator::Deref) 2521 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2522 // (assuming the deref expression is valid). 2523 return uOp->getSubExpr()->getType(); 2524 } 2525 // Technically, there should be a check for array subscript 2526 // expressions here, but the result of one is always an lvalue anyway. 2527 } 2528 NamedDecl *dcl = getPrimaryDecl(op); 2529 Expr::isLvalueResult lval = op->isLvalue(Context); 2530 2531 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2532 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2533 // FIXME: emit more specific diag... 2534 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 2535 op->getSourceRange()); 2536 return QualType(); 2537 } 2538 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2539 if (MemExpr->getMemberDecl()->isBitField()) { 2540 Diag(OpLoc, diag::err_typecheck_address_of, 2541 std::string("bit-field"), op->getSourceRange()); 2542 return QualType(); 2543 } 2544 // Check for Apple extension for accessing vector components. 2545 } else if (isa<ArraySubscriptExpr>(op) && 2546 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2547 Diag(OpLoc, diag::err_typecheck_address_of, 2548 std::string("vector"), op->getSourceRange()); 2549 return QualType(); 2550 } else if (dcl) { // C99 6.5.3.2p1 2551 // We have an lvalue with a decl. Make sure the decl is not declared 2552 // with the register storage-class specifier. 2553 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2554 if (vd->getStorageClass() == VarDecl::Register) { 2555 Diag(OpLoc, diag::err_typecheck_address_of, 2556 std::string("register variable"), op->getSourceRange()); 2557 return QualType(); 2558 } 2559 } else if (isa<OverloadedFunctionDecl>(dcl)) 2560 return Context.OverloadTy; 2561 else 2562 assert(0 && "Unknown/unexpected decl type"); 2563 } 2564 2565 // If the operand has type "type", the result has type "pointer to type". 2566 return Context.getPointerType(op->getType()); 2567} 2568 2569QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 2570 UsualUnaryConversions(op); 2571 QualType qType = op->getType(); 2572 2573 if (const PointerType *PT = qType->getAsPointerType()) { 2574 // Note that per both C89 and C99, this is always legal, even 2575 // if ptype is an incomplete type or void. 2576 // It would be possible to warn about dereferencing a 2577 // void pointer, but it's completely well-defined, 2578 // and such a warning is unlikely to catch any mistakes. 2579 return PT->getPointeeType(); 2580 } 2581 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 2582 qType.getAsString(), op->getSourceRange()); 2583 return QualType(); 2584} 2585 2586static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2587 tok::TokenKind Kind) { 2588 BinaryOperator::Opcode Opc; 2589 switch (Kind) { 2590 default: assert(0 && "Unknown binop!"); 2591 case tok::star: Opc = BinaryOperator::Mul; break; 2592 case tok::slash: Opc = BinaryOperator::Div; break; 2593 case tok::percent: Opc = BinaryOperator::Rem; break; 2594 case tok::plus: Opc = BinaryOperator::Add; break; 2595 case tok::minus: Opc = BinaryOperator::Sub; break; 2596 case tok::lessless: Opc = BinaryOperator::Shl; break; 2597 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2598 case tok::lessequal: Opc = BinaryOperator::LE; break; 2599 case tok::less: Opc = BinaryOperator::LT; break; 2600 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2601 case tok::greater: Opc = BinaryOperator::GT; break; 2602 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2603 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2604 case tok::amp: Opc = BinaryOperator::And; break; 2605 case tok::caret: Opc = BinaryOperator::Xor; break; 2606 case tok::pipe: Opc = BinaryOperator::Or; break; 2607 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2608 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2609 case tok::equal: Opc = BinaryOperator::Assign; break; 2610 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2611 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2612 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2613 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2614 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2615 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2616 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2617 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2618 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2619 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2620 case tok::comma: Opc = BinaryOperator::Comma; break; 2621 } 2622 return Opc; 2623} 2624 2625static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2626 tok::TokenKind Kind) { 2627 UnaryOperator::Opcode Opc; 2628 switch (Kind) { 2629 default: assert(0 && "Unknown unary op!"); 2630 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2631 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2632 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2633 case tok::star: Opc = UnaryOperator::Deref; break; 2634 case tok::plus: Opc = UnaryOperator::Plus; break; 2635 case tok::minus: Opc = UnaryOperator::Minus; break; 2636 case tok::tilde: Opc = UnaryOperator::Not; break; 2637 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2638 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 2639 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 2640 case tok::kw___real: Opc = UnaryOperator::Real; break; 2641 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2642 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2643 } 2644 return Opc; 2645} 2646 2647/// CreateBuiltinBinOp - Creates a new built-in binary operation with 2648/// operator @p Opc at location @c TokLoc. This routine only supports 2649/// built-in operations; ActOnBinOp handles overloaded operators. 2650Action::ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 2651 unsigned Op, 2652 Expr *lhs, Expr *rhs) { 2653 QualType ResultTy; // Result type of the binary operator. 2654 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2655 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 2656 2657 switch (Opc) { 2658 default: 2659 assert(0 && "Unknown binary expr!"); 2660 case BinaryOperator::Assign: 2661 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 2662 break; 2663 case BinaryOperator::Mul: 2664 case BinaryOperator::Div: 2665 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 2666 break; 2667 case BinaryOperator::Rem: 2668 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 2669 break; 2670 case BinaryOperator::Add: 2671 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 2672 break; 2673 case BinaryOperator::Sub: 2674 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 2675 break; 2676 case BinaryOperator::Shl: 2677 case BinaryOperator::Shr: 2678 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 2679 break; 2680 case BinaryOperator::LE: 2681 case BinaryOperator::LT: 2682 case BinaryOperator::GE: 2683 case BinaryOperator::GT: 2684 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 2685 break; 2686 case BinaryOperator::EQ: 2687 case BinaryOperator::NE: 2688 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 2689 break; 2690 case BinaryOperator::And: 2691 case BinaryOperator::Xor: 2692 case BinaryOperator::Or: 2693 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 2694 break; 2695 case BinaryOperator::LAnd: 2696 case BinaryOperator::LOr: 2697 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 2698 break; 2699 case BinaryOperator::MulAssign: 2700 case BinaryOperator::DivAssign: 2701 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 2702 if (!CompTy.isNull()) 2703 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2704 break; 2705 case BinaryOperator::RemAssign: 2706 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 2707 if (!CompTy.isNull()) 2708 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2709 break; 2710 case BinaryOperator::AddAssign: 2711 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 2712 if (!CompTy.isNull()) 2713 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2714 break; 2715 case BinaryOperator::SubAssign: 2716 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 2717 if (!CompTy.isNull()) 2718 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2719 break; 2720 case BinaryOperator::ShlAssign: 2721 case BinaryOperator::ShrAssign: 2722 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 2723 if (!CompTy.isNull()) 2724 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2725 break; 2726 case BinaryOperator::AndAssign: 2727 case BinaryOperator::XorAssign: 2728 case BinaryOperator::OrAssign: 2729 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 2730 if (!CompTy.isNull()) 2731 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2732 break; 2733 case BinaryOperator::Comma: 2734 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 2735 break; 2736 } 2737 if (ResultTy.isNull()) 2738 return true; 2739 if (CompTy.isNull()) 2740 return new BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc); 2741 else 2742 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, OpLoc); 2743} 2744 2745// Binary Operators. 'Tok' is the token for the operator. 2746Action::ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 2747 tok::TokenKind Kind, 2748 ExprTy *LHS, ExprTy *RHS) { 2749 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 2750 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 2751 2752 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 2753 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 2754 2755 if (getLangOptions().CPlusPlus && 2756 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 2757 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 2758 // C++ [over.binary]p1: 2759 // A binary operator shall be implemented either by a non-static 2760 // member function (9.3) with one parameter or by a non-member 2761 // function with two parameters. Thus, for any binary operator 2762 // @, x@y can be interpreted as either x.operator@(y) or 2763 // operator@(x,y). If both forms of the operator function have 2764 // been declared, the rules in 13.3.1.2 determines which, if 2765 // any, interpretation is used. 2766 OverloadCandidateSet CandidateSet; 2767 2768 // Determine which overloaded operator we're dealing with. 2769 static const OverloadedOperatorKind OverOps[] = { 2770 OO_Star, OO_Slash, OO_Percent, 2771 OO_Plus, OO_Minus, 2772 OO_LessLess, OO_GreaterGreater, 2773 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 2774 OO_EqualEqual, OO_ExclaimEqual, 2775 OO_Amp, 2776 OO_Caret, 2777 OO_Pipe, 2778 OO_AmpAmp, 2779 OO_PipePipe, 2780 OO_Equal, OO_StarEqual, 2781 OO_SlashEqual, OO_PercentEqual, 2782 OO_PlusEqual, OO_MinusEqual, 2783 OO_LessLessEqual, OO_GreaterGreaterEqual, 2784 OO_AmpEqual, OO_CaretEqual, 2785 OO_PipeEqual, 2786 OO_Comma 2787 }; 2788 OverloadedOperatorKind OverOp = OverOps[Opc]; 2789 2790 // Lookup this operator. 2791 Decl *D = LookupDecl(&PP.getIdentifierTable().getOverloadedOperator(OverOp), 2792 Decl::IDNS_Ordinary, S); 2793 2794 // Add any overloaded operators we find to the overload set. 2795 Expr *Args[2] = { lhs, rhs }; 2796 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) 2797 AddOverloadCandidate(FD, Args, 2, CandidateSet); 2798 else if (OverloadedFunctionDecl *Ovl 2799 = dyn_cast_or_null<OverloadedFunctionDecl>(D)) 2800 AddOverloadCandidates(Ovl, Args, 2, CandidateSet); 2801 2802 // FIXME: Add builtin overload candidates (C++ [over.built]). 2803 2804 // Perform overload resolution. 2805 OverloadCandidateSet::iterator Best; 2806 switch (BestViableFunction(CandidateSet, Best)) { 2807 case OR_Success: { 2808 // FIXME: We might find a built-in candidate here. 2809 FunctionDecl *FnDecl = Best->Function; 2810 2811 // Convert the arguments. 2812 // FIXME: Conversion will be different for member operators. 2813 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 2814 "passing") || 2815 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 2816 "passing")) 2817 return true; 2818 2819 // Determine the result type 2820 QualType ResultTy 2821 = FnDecl->getType()->getAsFunctionType()->getResultType(); 2822 ResultTy = ResultTy.getNonReferenceType(); 2823 2824 // Build the actual expression node. 2825 // FIXME: We lose the fact that we have a function here! 2826 if (Opc > BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) 2827 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, ResultTy, 2828 TokLoc); 2829 else 2830 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 2831 } 2832 2833 case OR_No_Viable_Function: 2834 // No viable function; fall through to handling this as a 2835 // built-in operator. 2836 break; 2837 2838 case OR_Ambiguous: 2839 Diag(TokLoc, 2840 diag::err_ovl_ambiguous_oper, 2841 BinaryOperator::getOpcodeStr(Opc), 2842 lhs->getSourceRange(), rhs->getSourceRange()); 2843 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2844 return true; 2845 } 2846 2847 // There was no viable overloaded operator; fall through. 2848 } 2849 2850 2851 // Build a built-in binary operation. 2852 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 2853} 2854 2855// Unary Operators. 'Tok' is the token for the operator. 2856Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2857 ExprTy *input) { 2858 Expr *Input = (Expr*)input; 2859 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2860 QualType resultType; 2861 switch (Opc) { 2862 default: 2863 assert(0 && "Unimplemented unary expr!"); 2864 case UnaryOperator::PreInc: 2865 case UnaryOperator::PreDec: 2866 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2867 break; 2868 case UnaryOperator::AddrOf: 2869 resultType = CheckAddressOfOperand(Input, OpLoc); 2870 break; 2871 case UnaryOperator::Deref: 2872 DefaultFunctionArrayConversion(Input); 2873 resultType = CheckIndirectionOperand(Input, OpLoc); 2874 break; 2875 case UnaryOperator::Plus: 2876 case UnaryOperator::Minus: 2877 UsualUnaryConversions(Input); 2878 resultType = Input->getType(); 2879 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2880 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2881 resultType.getAsString()); 2882 break; 2883 case UnaryOperator::Not: // bitwise complement 2884 UsualUnaryConversions(Input); 2885 resultType = Input->getType(); 2886 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 2887 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 2888 // C99 does not support '~' for complex conjugation. 2889 Diag(OpLoc, diag::ext_integer_complement_complex, 2890 resultType.getAsString(), Input->getSourceRange()); 2891 else if (!resultType->isIntegerType()) 2892 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2893 resultType.getAsString(), Input->getSourceRange()); 2894 break; 2895 case UnaryOperator::LNot: // logical negation 2896 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2897 DefaultFunctionArrayConversion(Input); 2898 resultType = Input->getType(); 2899 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2900 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2901 resultType.getAsString()); 2902 // LNot always has type int. C99 6.5.3.3p5. 2903 resultType = Context.IntTy; 2904 break; 2905 case UnaryOperator::SizeOf: 2906 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2907 Input->getSourceRange(), true); 2908 break; 2909 case UnaryOperator::AlignOf: 2910 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2911 Input->getSourceRange(), false); 2912 break; 2913 case UnaryOperator::Real: 2914 case UnaryOperator::Imag: 2915 resultType = CheckRealImagOperand(Input, OpLoc); 2916 break; 2917 case UnaryOperator::Extension: 2918 resultType = Input->getType(); 2919 break; 2920 } 2921 if (resultType.isNull()) 2922 return true; 2923 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2924} 2925 2926/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2927Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2928 SourceLocation LabLoc, 2929 IdentifierInfo *LabelII) { 2930 // Look up the record for this label identifier. 2931 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2932 2933 // If we haven't seen this label yet, create a forward reference. It 2934 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 2935 if (LabelDecl == 0) 2936 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2937 2938 // Create the AST node. The address of a label always has type 'void*'. 2939 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2940 Context.getPointerType(Context.VoidTy)); 2941} 2942 2943Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2944 SourceLocation RPLoc) { // "({..})" 2945 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2946 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2947 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2948 2949 // FIXME: there are a variety of strange constraints to enforce here, for 2950 // example, it is not possible to goto into a stmt expression apparently. 2951 // More semantic analysis is needed. 2952 2953 // FIXME: the last statement in the compount stmt has its value used. We 2954 // should not warn about it being unused. 2955 2956 // If there are sub stmts in the compound stmt, take the type of the last one 2957 // as the type of the stmtexpr. 2958 QualType Ty = Context.VoidTy; 2959 2960 if (!Compound->body_empty()) { 2961 Stmt *LastStmt = Compound->body_back(); 2962 // If LastStmt is a label, skip down through into the body. 2963 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 2964 LastStmt = Label->getSubStmt(); 2965 2966 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 2967 Ty = LastExpr->getType(); 2968 } 2969 2970 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2971} 2972 2973Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2974 SourceLocation TypeLoc, 2975 TypeTy *argty, 2976 OffsetOfComponent *CompPtr, 2977 unsigned NumComponents, 2978 SourceLocation RPLoc) { 2979 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2980 assert(!ArgTy.isNull() && "Missing type argument!"); 2981 2982 // We must have at least one component that refers to the type, and the first 2983 // one is known to be a field designator. Verify that the ArgTy represents 2984 // a struct/union/class. 2985 if (!ArgTy->isRecordType()) 2986 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2987 2988 // Otherwise, create a compound literal expression as the base, and 2989 // iteratively process the offsetof designators. 2990 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2991 2992 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2993 // GCC extension, diagnose them. 2994 if (NumComponents != 1) 2995 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2996 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2997 2998 for (unsigned i = 0; i != NumComponents; ++i) { 2999 const OffsetOfComponent &OC = CompPtr[i]; 3000 if (OC.isBrackets) { 3001 // Offset of an array sub-field. TODO: Should we allow vector elements? 3002 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 3003 if (!AT) { 3004 delete Res; 3005 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 3006 Res->getType().getAsString()); 3007 } 3008 3009 // FIXME: C++: Verify that operator[] isn't overloaded. 3010 3011 // C99 6.5.2.1p1 3012 Expr *Idx = static_cast<Expr*>(OC.U.E); 3013 if (!Idx->getType()->isIntegerType()) 3014 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 3015 Idx->getSourceRange()); 3016 3017 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 3018 continue; 3019 } 3020 3021 const RecordType *RC = Res->getType()->getAsRecordType(); 3022 if (!RC) { 3023 delete Res; 3024 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 3025 Res->getType().getAsString()); 3026 } 3027 3028 // Get the decl corresponding to this. 3029 RecordDecl *RD = RC->getDecl(); 3030 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 3031 if (!MemberDecl) 3032 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 3033 OC.U.IdentInfo->getName(), 3034 SourceRange(OC.LocStart, OC.LocEnd)); 3035 3036 // FIXME: C++: Verify that MemberDecl isn't a static field. 3037 // FIXME: Verify that MemberDecl isn't a bitfield. 3038 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 3039 // matter here. 3040 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, 3041 MemberDecl->getType().getNonReferenceType()); 3042 } 3043 3044 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 3045 BuiltinLoc); 3046} 3047 3048 3049Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 3050 TypeTy *arg1, TypeTy *arg2, 3051 SourceLocation RPLoc) { 3052 QualType argT1 = QualType::getFromOpaquePtr(arg1); 3053 QualType argT2 = QualType::getFromOpaquePtr(arg2); 3054 3055 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 3056 3057 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 3058} 3059 3060Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 3061 ExprTy *expr1, ExprTy *expr2, 3062 SourceLocation RPLoc) { 3063 Expr *CondExpr = static_cast<Expr*>(cond); 3064 Expr *LHSExpr = static_cast<Expr*>(expr1); 3065 Expr *RHSExpr = static_cast<Expr*>(expr2); 3066 3067 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 3068 3069 // The conditional expression is required to be a constant expression. 3070 llvm::APSInt condEval(32); 3071 SourceLocation ExpLoc; 3072 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 3073 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 3074 CondExpr->getSourceRange()); 3075 3076 // If the condition is > zero, then the AST type is the same as the LSHExpr. 3077 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 3078 RHSExpr->getType(); 3079 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 3080} 3081 3082//===----------------------------------------------------------------------===// 3083// Clang Extensions. 3084//===----------------------------------------------------------------------===// 3085 3086/// ActOnBlockStart - This callback is invoked when a block literal is started. 3087void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 3088 // Analyze block parameters. 3089 BlockSemaInfo *BSI = new BlockSemaInfo(); 3090 3091 // Add BSI to CurBlock. 3092 BSI->PrevBlockInfo = CurBlock; 3093 CurBlock = BSI; 3094 3095 BSI->ReturnType = 0; 3096 BSI->TheScope = BlockScope; 3097 3098 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 3099 PushDeclContext(BSI->TheDecl); 3100} 3101 3102void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 3103 // Analyze arguments to block. 3104 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 3105 "Not a function declarator!"); 3106 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 3107 3108 CurBlock->hasPrototype = FTI.hasPrototype; 3109 CurBlock->isVariadic = true; 3110 3111 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 3112 // no arguments, not a function that takes a single void argument. 3113 if (FTI.hasPrototype && 3114 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3115 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 3116 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 3117 // empty arg list, don't push any params. 3118 CurBlock->isVariadic = false; 3119 } else if (FTI.hasPrototype) { 3120 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 3121 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 3122 CurBlock->isVariadic = FTI.isVariadic; 3123 } 3124 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 3125 3126 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 3127 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 3128 // If this has an identifier, add it to the scope stack. 3129 if ((*AI)->getIdentifier()) 3130 PushOnScopeChains(*AI, CurBlock->TheScope); 3131} 3132 3133/// ActOnBlockError - If there is an error parsing a block, this callback 3134/// is invoked to pop the information about the block from the action impl. 3135void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 3136 // Ensure that CurBlock is deleted. 3137 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 3138 3139 // Pop off CurBlock, handle nested blocks. 3140 CurBlock = CurBlock->PrevBlockInfo; 3141 3142 // FIXME: Delete the ParmVarDecl objects as well??? 3143 3144} 3145 3146/// ActOnBlockStmtExpr - This is called when the body of a block statement 3147/// literal was successfully completed. ^(int x){...} 3148Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 3149 Scope *CurScope) { 3150 // Ensure that CurBlock is deleted. 3151 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 3152 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 3153 3154 PopDeclContext(); 3155 3156 // Pop off CurBlock, handle nested blocks. 3157 CurBlock = CurBlock->PrevBlockInfo; 3158 3159 QualType RetTy = Context.VoidTy; 3160 if (BSI->ReturnType) 3161 RetTy = QualType(BSI->ReturnType, 0); 3162 3163 llvm::SmallVector<QualType, 8> ArgTypes; 3164 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 3165 ArgTypes.push_back(BSI->Params[i]->getType()); 3166 3167 QualType BlockTy; 3168 if (!BSI->hasPrototype) 3169 BlockTy = Context.getFunctionTypeNoProto(RetTy); 3170 else 3171 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 3172 BSI->isVariadic, 0); 3173 3174 BlockTy = Context.getBlockPointerType(BlockTy); 3175 3176 BSI->TheDecl->setBody(Body.take()); 3177 return new BlockExpr(BSI->TheDecl, BlockTy); 3178} 3179 3180/// ExprsMatchFnType - return true if the Exprs in array Args have 3181/// QualTypes that match the QualTypes of the arguments of the FnType. 3182/// The number of arguments has already been validated to match the number of 3183/// arguments in FnType. 3184static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 3185 ASTContext &Context) { 3186 unsigned NumParams = FnType->getNumArgs(); 3187 for (unsigned i = 0; i != NumParams; ++i) { 3188 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 3189 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 3190 3191 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 3192 return false; 3193 } 3194 return true; 3195} 3196 3197Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 3198 SourceLocation *CommaLocs, 3199 SourceLocation BuiltinLoc, 3200 SourceLocation RParenLoc) { 3201 // __builtin_overload requires at least 2 arguments 3202 if (NumArgs < 2) 3203 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3204 SourceRange(BuiltinLoc, RParenLoc)); 3205 3206 // The first argument is required to be a constant expression. It tells us 3207 // the number of arguments to pass to each of the functions to be overloaded. 3208 Expr **Args = reinterpret_cast<Expr**>(args); 3209 Expr *NParamsExpr = Args[0]; 3210 llvm::APSInt constEval(32); 3211 SourceLocation ExpLoc; 3212 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 3213 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3214 NParamsExpr->getSourceRange()); 3215 3216 // Verify that the number of parameters is > 0 3217 unsigned NumParams = constEval.getZExtValue(); 3218 if (NumParams == 0) 3219 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3220 NParamsExpr->getSourceRange()); 3221 // Verify that we have at least 1 + NumParams arguments to the builtin. 3222 if ((NumParams + 1) > NumArgs) 3223 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3224 SourceRange(BuiltinLoc, RParenLoc)); 3225 3226 // Figure out the return type, by matching the args to one of the functions 3227 // listed after the parameters. 3228 OverloadExpr *OE = 0; 3229 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 3230 // UsualUnaryConversions will convert the function DeclRefExpr into a 3231 // pointer to function. 3232 Expr *Fn = UsualUnaryConversions(Args[i]); 3233 const FunctionTypeProto *FnType = 0; 3234 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3235 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3236 3237 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3238 // parameters, and the number of parameters must match the value passed to 3239 // the builtin. 3240 if (!FnType || (FnType->getNumArgs() != NumParams)) 3241 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 3242 Fn->getSourceRange()); 3243 3244 // Scan the parameter list for the FunctionType, checking the QualType of 3245 // each parameter against the QualTypes of the arguments to the builtin. 3246 // If they match, return a new OverloadExpr. 3247 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3248 if (OE) 3249 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 3250 OE->getFn()->getSourceRange()); 3251 // Remember our match, and continue processing the remaining arguments 3252 // to catch any errors. 3253 OE = new OverloadExpr(Args, NumArgs, i, 3254 FnType->getResultType().getNonReferenceType(), 3255 BuiltinLoc, RParenLoc); 3256 } 3257 } 3258 // Return the newly created OverloadExpr node, if we succeded in matching 3259 // exactly one of the candidate functions. 3260 if (OE) 3261 return OE; 3262 3263 // If we didn't find a matching function Expr in the __builtin_overload list 3264 // the return an error. 3265 std::string typeNames; 3266 for (unsigned i = 0; i != NumParams; ++i) { 3267 if (i != 0) typeNames += ", "; 3268 typeNames += Args[i+1]->getType().getAsString(); 3269 } 3270 3271 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 3272 SourceRange(BuiltinLoc, RParenLoc)); 3273} 3274 3275Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3276 ExprTy *expr, TypeTy *type, 3277 SourceLocation RPLoc) { 3278 Expr *E = static_cast<Expr*>(expr); 3279 QualType T = QualType::getFromOpaquePtr(type); 3280 3281 InitBuiltinVaListType(); 3282 3283 // Get the va_list type 3284 QualType VaListType = Context.getBuiltinVaListType(); 3285 // Deal with implicit array decay; for example, on x86-64, 3286 // va_list is an array, but it's supposed to decay to 3287 // a pointer for va_arg. 3288 if (VaListType->isArrayType()) 3289 VaListType = Context.getArrayDecayedType(VaListType); 3290 // Make sure the input expression also decays appropriately. 3291 UsualUnaryConversions(E); 3292 3293 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3294 return Diag(E->getLocStart(), 3295 diag::err_first_argument_to_va_arg_not_of_type_va_list, 3296 E->getType().getAsString(), 3297 E->getSourceRange()); 3298 3299 // FIXME: Warn if a non-POD type is passed in. 3300 3301 return new VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 3302} 3303 3304bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3305 SourceLocation Loc, 3306 QualType DstType, QualType SrcType, 3307 Expr *SrcExpr, const char *Flavor) { 3308 // Decode the result (notice that AST's are still created for extensions). 3309 bool isInvalid = false; 3310 unsigned DiagKind; 3311 switch (ConvTy) { 3312 default: assert(0 && "Unknown conversion type"); 3313 case Compatible: return false; 3314 case PointerToInt: 3315 DiagKind = diag::ext_typecheck_convert_pointer_int; 3316 break; 3317 case IntToPointer: 3318 DiagKind = diag::ext_typecheck_convert_int_pointer; 3319 break; 3320 case IncompatiblePointer: 3321 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3322 break; 3323 case FunctionVoidPointer: 3324 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3325 break; 3326 case CompatiblePointerDiscardsQualifiers: 3327 // If the qualifiers lost were because we were applying the 3328 // (deprecated) C++ conversion from a string literal to a char* 3329 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3330 // Ideally, this check would be performed in 3331 // CheckPointerTypesForAssignment. However, that would require a 3332 // bit of refactoring (so that the second argument is an 3333 // expression, rather than a type), which should be done as part 3334 // of a larger effort to fix CheckPointerTypesForAssignment for 3335 // C++ semantics. 3336 if (getLangOptions().CPlusPlus && 3337 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3338 return false; 3339 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3340 break; 3341 case IntToBlockPointer: 3342 DiagKind = diag::err_int_to_block_pointer; 3343 break; 3344 case IncompatibleBlockPointer: 3345 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3346 break; 3347 case BlockVoidPointer: 3348 DiagKind = diag::ext_typecheck_convert_pointer_void_block; 3349 break; 3350 case IncompatibleObjCQualifiedId: 3351 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3352 // it can give a more specific diagnostic. 3353 DiagKind = diag::warn_incompatible_qualified_id; 3354 break; 3355 case Incompatible: 3356 DiagKind = diag::err_typecheck_convert_incompatible; 3357 isInvalid = true; 3358 break; 3359 } 3360 3361 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 3362 SrcExpr->getSourceRange()); 3363 return isInvalid; 3364} 3365