SemaExpr.cpp revision d7f915e74b3906e075d8fbd7b546f40fb6a39814
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/Lex/Preprocessor.h" 20#include "clang/Lex/LiteralSupport.h" 21#include "clang/Basic/Diagnostic.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Designator.h" 26#include "clang/Parse/Scope.h" 27using namespace clang; 28 29//===----------------------------------------------------------------------===// 30// Standard Promotions and Conversions 31//===----------------------------------------------------------------------===// 32 33/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 34void Sema::DefaultFunctionArrayConversion(Expr *&E) { 35 QualType Ty = E->getType(); 36 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 37 38 if (Ty->isFunctionType()) 39 ImpCastExprToType(E, Context.getPointerType(Ty)); 40 else if (Ty->isArrayType()) { 41 // In C90 mode, arrays only promote to pointers if the array expression is 42 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 43 // type 'array of type' is converted to an expression that has type 'pointer 44 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 45 // that has type 'array of type' ...". The relevant change is "an lvalue" 46 // (C90) to "an expression" (C99). 47 // 48 // C++ 4.2p1: 49 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 50 // T" can be converted to an rvalue of type "pointer to T". 51 // 52 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 53 E->isLvalue(Context) == Expr::LV_Valid) 54 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 55 } 56} 57 58/// UsualUnaryConversions - Performs various conversions that are common to most 59/// operators (C99 6.3). The conversions of array and function types are 60/// sometimes surpressed. For example, the array->pointer conversion doesn't 61/// apply if the array is an argument to the sizeof or address (&) operators. 62/// In these instances, this routine should *not* be called. 63Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 64 QualType Ty = Expr->getType(); 65 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 66 67 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 68 ImpCastExprToType(Expr, Context.IntTy); 69 else 70 DefaultFunctionArrayConversion(Expr); 71 72 return Expr; 73} 74 75/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 76/// do not have a prototype. Arguments that have type float are promoted to 77/// double. All other argument types are converted by UsualUnaryConversions(). 78void Sema::DefaultArgumentPromotion(Expr *&Expr) { 79 QualType Ty = Expr->getType(); 80 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 81 82 // If this is a 'float' (CVR qualified or typedef) promote to double. 83 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 84 if (BT->getKind() == BuiltinType::Float) 85 return ImpCastExprToType(Expr, Context.DoubleTy); 86 87 UsualUnaryConversions(Expr); 88} 89 90/// UsualArithmeticConversions - Performs various conversions that are common to 91/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 92/// routine returns the first non-arithmetic type found. The client is 93/// responsible for emitting appropriate error diagnostics. 94/// FIXME: verify the conversion rules for "complex int" are consistent with 95/// GCC. 96QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 97 bool isCompAssign) { 98 if (!isCompAssign) { 99 UsualUnaryConversions(lhsExpr); 100 UsualUnaryConversions(rhsExpr); 101 } 102 // For conversion purposes, we ignore any qualifiers. 103 // For example, "const float" and "float" are equivalent. 104 QualType lhs = 105 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 106 QualType rhs = 107 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 108 109 // If both types are identical, no conversion is needed. 110 if (lhs == rhs) 111 return lhs; 112 113 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 114 // The caller can deal with this (e.g. pointer + int). 115 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 116 return lhs; 117 118 // At this point, we have two different arithmetic types. 119 120 // Handle complex types first (C99 6.3.1.8p1). 121 if (lhs->isComplexType() || rhs->isComplexType()) { 122 // if we have an integer operand, the result is the complex type. 123 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 124 // convert the rhs to the lhs complex type. 125 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 126 return lhs; 127 } 128 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 129 // convert the lhs to the rhs complex type. 130 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 131 return rhs; 132 } 133 // This handles complex/complex, complex/float, or float/complex. 134 // When both operands are complex, the shorter operand is converted to the 135 // type of the longer, and that is the type of the result. This corresponds 136 // to what is done when combining two real floating-point operands. 137 // The fun begins when size promotion occur across type domains. 138 // From H&S 6.3.4: When one operand is complex and the other is a real 139 // floating-point type, the less precise type is converted, within it's 140 // real or complex domain, to the precision of the other type. For example, 141 // when combining a "long double" with a "double _Complex", the 142 // "double _Complex" is promoted to "long double _Complex". 143 int result = Context.getFloatingTypeOrder(lhs, rhs); 144 145 if (result > 0) { // The left side is bigger, convert rhs. 146 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 147 if (!isCompAssign) 148 ImpCastExprToType(rhsExpr, rhs); 149 } else if (result < 0) { // The right side is bigger, convert lhs. 150 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 151 if (!isCompAssign) 152 ImpCastExprToType(lhsExpr, lhs); 153 } 154 // At this point, lhs and rhs have the same rank/size. Now, make sure the 155 // domains match. This is a requirement for our implementation, C99 156 // does not require this promotion. 157 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 158 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 159 if (!isCompAssign) 160 ImpCastExprToType(lhsExpr, rhs); 161 return rhs; 162 } else { // handle "_Complex double, double". 163 if (!isCompAssign) 164 ImpCastExprToType(rhsExpr, lhs); 165 return lhs; 166 } 167 } 168 return lhs; // The domain/size match exactly. 169 } 170 // Now handle "real" floating types (i.e. float, double, long double). 171 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 172 // if we have an integer operand, the result is the real floating type. 173 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 174 // convert rhs to the lhs floating point type. 175 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 176 return lhs; 177 } 178 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 179 // convert lhs to the rhs floating point type. 180 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 181 return rhs; 182 } 183 // We have two real floating types, float/complex combos were handled above. 184 // Convert the smaller operand to the bigger result. 185 int result = Context.getFloatingTypeOrder(lhs, rhs); 186 187 if (result > 0) { // convert the rhs 188 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 189 return lhs; 190 } 191 if (result < 0) { // convert the lhs 192 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 193 return rhs; 194 } 195 assert(0 && "Sema::UsualArithmeticConversions(): illegal float comparison"); 196 } 197 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 198 // Handle GCC complex int extension. 199 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 200 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 201 202 if (lhsComplexInt && rhsComplexInt) { 203 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 204 rhsComplexInt->getElementType()) >= 0) { 205 // convert the rhs 206 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 207 return lhs; 208 } 209 if (!isCompAssign) 210 ImpCastExprToType(lhsExpr, rhs); // convert the lhs 211 return rhs; 212 } else if (lhsComplexInt && rhs->isIntegerType()) { 213 // convert the rhs to the lhs complex type. 214 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 215 return lhs; 216 } else if (rhsComplexInt && lhs->isIntegerType()) { 217 // convert the lhs to the rhs complex type. 218 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 219 return rhs; 220 } 221 } 222 // Finally, we have two differing integer types. 223 // The rules for this case are in C99 6.3.1.8 224 int compare = Context.getIntegerTypeOrder(lhs, rhs); 225 bool lhsSigned = lhs->isSignedIntegerType(), 226 rhsSigned = rhs->isSignedIntegerType(); 227 QualType destType; 228 if (lhsSigned == rhsSigned) { 229 // Same signedness; use the higher-ranked type 230 destType = compare >= 0 ? lhs : rhs; 231 } else if (compare != (lhsSigned ? 1 : -1)) { 232 // The unsigned type has greater than or equal rank to the 233 // signed type, so use the unsigned type 234 destType = lhsSigned ? rhs : lhs; 235 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 236 // The two types are different widths; if we are here, that 237 // means the signed type is larger than the unsigned type, so 238 // use the signed type. 239 destType = lhsSigned ? lhs : rhs; 240 } else { 241 // The signed type is higher-ranked than the unsigned type, 242 // but isn't actually any bigger (like unsigned int and long 243 // on most 32-bit systems). Use the unsigned type corresponding 244 // to the signed type. 245 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 246 } 247 if (!isCompAssign) { 248 ImpCastExprToType(lhsExpr, destType); 249 ImpCastExprToType(rhsExpr, destType); 250 } 251 return destType; 252} 253 254//===----------------------------------------------------------------------===// 255// Semantic Analysis for various Expression Types 256//===----------------------------------------------------------------------===// 257 258 259/// ActOnStringLiteral - The specified tokens were lexed as pasted string 260/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 261/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 262/// multiple tokens. However, the common case is that StringToks points to one 263/// string. 264/// 265Action::ExprResult 266Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 267 assert(NumStringToks && "Must have at least one string!"); 268 269 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 270 if (Literal.hadError) 271 return ExprResult(true); 272 273 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 274 for (unsigned i = 0; i != NumStringToks; ++i) 275 StringTokLocs.push_back(StringToks[i].getLocation()); 276 277 // Verify that pascal strings aren't too large. 278 if (Literal.Pascal && Literal.GetStringLength() > 256) 279 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long, 280 SourceRange(StringToks[0].getLocation(), 281 StringToks[NumStringToks-1].getLocation())); 282 283 QualType StrTy = Context.CharTy; 284 if (Literal.AnyWide) StrTy = Context.getWCharType(); 285 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 286 287 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 288 if (getLangOptions().CPlusPlus) 289 StrTy.addConst(); 290 291 // Get an array type for the string, according to C99 6.4.5. This includes 292 // the nul terminator character as well as the string length for pascal 293 // strings. 294 StrTy = Context.getConstantArrayType(StrTy, 295 llvm::APInt(32, Literal.GetStringLength()+1), 296 ArrayType::Normal, 0); 297 298 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 299 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 300 Literal.AnyWide, StrTy, 301 StringToks[0].getLocation(), 302 StringToks[NumStringToks-1].getLocation()); 303} 304 305/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 306/// CurBlock to VD should cause it to be snapshotted (as we do for auto 307/// variables defined outside the block) or false if this is not needed (e.g. 308/// for values inside the block or for globals). 309/// 310/// FIXME: This will create BlockDeclRefExprs for global variables, 311/// function references, etc which is suboptimal :) and breaks 312/// things like "integer constant expression" tests. 313static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 314 ValueDecl *VD) { 315 // If the value is defined inside the block, we couldn't snapshot it even if 316 // we wanted to. 317 if (CurBlock->TheDecl == VD->getDeclContext()) 318 return false; 319 320 // If this is an enum constant or function, it is constant, don't snapshot. 321 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 322 return false; 323 324 // If this is a reference to an extern, static, or global variable, no need to 325 // snapshot it. 326 // FIXME: What about 'const' variables in C++? 327 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 328 return Var->hasLocalStorage(); 329 330 return true; 331} 332 333 334 335/// ActOnIdentifierExpr - The parser read an identifier in expression context, 336/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 337/// identifier is used in a function call context. 338Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 339 IdentifierInfo &II, 340 bool HasTrailingLParen) { 341 // Could be enum-constant, value decl, instance variable, etc. 342 Decl *D = LookupDecl(&II, Decl::IDNS_Ordinary, S); 343 344 // If this reference is in an Objective-C method, then ivar lookup happens as 345 // well. 346 if (getCurMethodDecl()) { 347 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 348 // There are two cases to handle here. 1) scoped lookup could have failed, 349 // in which case we should look for an ivar. 2) scoped lookup could have 350 // found a decl, but that decl is outside the current method (i.e. a global 351 // variable). In these two cases, we do a lookup for an ivar with this 352 // name, if the lookup suceeds, we replace it our current decl. 353 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 354 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 355 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&II)) { 356 // FIXME: This should use a new expr for a direct reference, don't turn 357 // this into Self->ivar, just return a BareIVarExpr or something. 358 IdentifierInfo &II = Context.Idents.get("self"); 359 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 360 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 361 static_cast<Expr*>(SelfExpr.Val), true, true); 362 } 363 } 364 // Needed to implement property "super.method" notation. 365 if (SD == 0 && &II == SuperID) { 366 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 367 getCurMethodDecl()->getClassInterface())); 368 return new ObjCSuperExpr(Loc, T); 369 } 370 } 371 if (D == 0) { 372 // Otherwise, this could be an implicitly declared function reference (legal 373 // in C90, extension in C99). 374 if (HasTrailingLParen && 375 !getLangOptions().CPlusPlus) // Not in C++. 376 D = ImplicitlyDefineFunction(Loc, II, S); 377 else { 378 // If this name wasn't predeclared and if this is not a function call, 379 // diagnose the problem. 380 return Diag(Loc, diag::err_undeclared_var_use, II.getName()); 381 } 382 } 383 384 if (CXXFieldDecl *FD = dyn_cast<CXXFieldDecl>(D)) { 385 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 386 if (MD->isStatic()) 387 // "invalid use of member 'x' in static member function" 388 return Diag(Loc, diag::err_invalid_member_use_in_static_method, 389 FD->getName()); 390 if (cast<CXXRecordDecl>(MD->getParent()) != FD->getParent()) 391 // "invalid use of nonstatic data member 'x'" 392 return Diag(Loc, diag::err_invalid_non_static_member_use, 393 FD->getName()); 394 395 if (FD->isInvalidDecl()) 396 return true; 397 398 // FIXME: Handle 'mutable'. 399 return new DeclRefExpr(FD, 400 FD->getType().getWithAdditionalQualifiers(MD->getTypeQualifiers()),Loc); 401 } 402 403 return Diag(Loc, diag::err_invalid_non_static_member_use, FD->getName()); 404 } 405 if (isa<TypedefDecl>(D)) 406 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 407 if (isa<ObjCInterfaceDecl>(D)) 408 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 409 if (isa<NamespaceDecl>(D)) 410 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 411 412 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 413 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 414 return new DeclRefExpr(Ovl, Context.OverloadTy, Loc); 415 416 ValueDecl *VD = cast<ValueDecl>(D); 417 418 // check if referencing an identifier with __attribute__((deprecated)). 419 if (VD->getAttr<DeprecatedAttr>()) 420 Diag(Loc, diag::warn_deprecated, VD->getName()); 421 422 // Only create DeclRefExpr's for valid Decl's. 423 if (VD->isInvalidDecl()) 424 return true; 425 426 // If the identifier reference is inside a block, and it refers to a value 427 // that is outside the block, create a BlockDeclRefExpr instead of a 428 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 429 // the block is formed. 430 // 431 // We do not do this for things like enum constants, global variables, etc, 432 // as they do not get snapshotted. 433 // 434 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 435 // The BlocksAttr indicates the variable is bound by-reference. 436 if (VD->getAttr<BlocksAttr>()) 437 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 438 Loc, true); 439 440 // Variable will be bound by-copy, make it const within the closure. 441 VD->getType().addConst(); 442 return new BlockDeclRefExpr(VD, VD->getType().getNonReferenceType(), 443 Loc, false); 444 } 445 // If this reference is not in a block or if the referenced variable is 446 // within the block, create a normal DeclRefExpr. 447 return new DeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc); 448} 449 450Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 451 tok::TokenKind Kind) { 452 PredefinedExpr::IdentType IT; 453 454 switch (Kind) { 455 default: assert(0 && "Unknown simple primary expr!"); 456 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 457 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 458 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 459 } 460 461 // Verify that this is in a function context. 462 if (getCurFunctionDecl() == 0 && getCurMethodDecl() == 0) 463 return Diag(Loc, diag::err_predef_outside_function); 464 465 // Pre-defined identifiers are of type char[x], where x is the length of the 466 // string. 467 unsigned Length; 468 if (getCurFunctionDecl()) 469 Length = getCurFunctionDecl()->getIdentifier()->getLength(); 470 else 471 Length = getCurMethodDecl()->getSynthesizedMethodSize(); 472 473 llvm::APInt LengthI(32, Length + 1); 474 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 475 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 476 return new PredefinedExpr(Loc, ResTy, IT); 477} 478 479Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 480 llvm::SmallString<16> CharBuffer; 481 CharBuffer.resize(Tok.getLength()); 482 const char *ThisTokBegin = &CharBuffer[0]; 483 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 484 485 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 486 Tok.getLocation(), PP); 487 if (Literal.hadError()) 488 return ExprResult(true); 489 490 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 491 492 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 493 Tok.getLocation()); 494} 495 496Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 497 // fast path for a single digit (which is quite common). A single digit 498 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 499 if (Tok.getLength() == 1) { 500 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 501 502 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 503 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 504 Context.IntTy, 505 Tok.getLocation())); 506 } 507 llvm::SmallString<512> IntegerBuffer; 508 // Add padding so that NumericLiteralParser can overread by one character. 509 IntegerBuffer.resize(Tok.getLength()+1); 510 const char *ThisTokBegin = &IntegerBuffer[0]; 511 512 // Get the spelling of the token, which eliminates trigraphs, etc. 513 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 514 515 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 516 Tok.getLocation(), PP); 517 if (Literal.hadError) 518 return ExprResult(true); 519 520 Expr *Res; 521 522 if (Literal.isFloatingLiteral()) { 523 QualType Ty; 524 if (Literal.isFloat) 525 Ty = Context.FloatTy; 526 else if (!Literal.isLong) 527 Ty = Context.DoubleTy; 528 else 529 Ty = Context.LongDoubleTy; 530 531 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 532 533 // isExact will be set by GetFloatValue(). 534 bool isExact = false; 535 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 536 Ty, Tok.getLocation()); 537 538 } else if (!Literal.isIntegerLiteral()) { 539 return ExprResult(true); 540 } else { 541 QualType Ty; 542 543 // long long is a C99 feature. 544 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 545 Literal.isLongLong) 546 Diag(Tok.getLocation(), diag::ext_longlong); 547 548 // Get the value in the widest-possible width. 549 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 550 551 if (Literal.GetIntegerValue(ResultVal)) { 552 // If this value didn't fit into uintmax_t, warn and force to ull. 553 Diag(Tok.getLocation(), diag::warn_integer_too_large); 554 Ty = Context.UnsignedLongLongTy; 555 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 556 "long long is not intmax_t?"); 557 } else { 558 // If this value fits into a ULL, try to figure out what else it fits into 559 // according to the rules of C99 6.4.4.1p5. 560 561 // Octal, Hexadecimal, and integers with a U suffix are allowed to 562 // be an unsigned int. 563 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 564 565 // Check from smallest to largest, picking the smallest type we can. 566 unsigned Width = 0; 567 if (!Literal.isLong && !Literal.isLongLong) { 568 // Are int/unsigned possibilities? 569 unsigned IntSize = Context.Target.getIntWidth(); 570 571 // Does it fit in a unsigned int? 572 if (ResultVal.isIntN(IntSize)) { 573 // Does it fit in a signed int? 574 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 575 Ty = Context.IntTy; 576 else if (AllowUnsigned) 577 Ty = Context.UnsignedIntTy; 578 Width = IntSize; 579 } 580 } 581 582 // Are long/unsigned long possibilities? 583 if (Ty.isNull() && !Literal.isLongLong) { 584 unsigned LongSize = Context.Target.getLongWidth(); 585 586 // Does it fit in a unsigned long? 587 if (ResultVal.isIntN(LongSize)) { 588 // Does it fit in a signed long? 589 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 590 Ty = Context.LongTy; 591 else if (AllowUnsigned) 592 Ty = Context.UnsignedLongTy; 593 Width = LongSize; 594 } 595 } 596 597 // Finally, check long long if needed. 598 if (Ty.isNull()) { 599 unsigned LongLongSize = Context.Target.getLongLongWidth(); 600 601 // Does it fit in a unsigned long long? 602 if (ResultVal.isIntN(LongLongSize)) { 603 // Does it fit in a signed long long? 604 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 605 Ty = Context.LongLongTy; 606 else if (AllowUnsigned) 607 Ty = Context.UnsignedLongLongTy; 608 Width = LongLongSize; 609 } 610 } 611 612 // If we still couldn't decide a type, we probably have something that 613 // does not fit in a signed long long, but has no U suffix. 614 if (Ty.isNull()) { 615 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 616 Ty = Context.UnsignedLongLongTy; 617 Width = Context.Target.getLongLongWidth(); 618 } 619 620 if (ResultVal.getBitWidth() != Width) 621 ResultVal.trunc(Width); 622 } 623 624 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 625 } 626 627 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 628 if (Literal.isImaginary) 629 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 630 631 return Res; 632} 633 634Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 635 ExprTy *Val) { 636 Expr *E = (Expr *)Val; 637 assert((E != 0) && "ActOnParenExpr() missing expr"); 638 return new ParenExpr(L, R, E); 639} 640 641/// The UsualUnaryConversions() function is *not* called by this routine. 642/// See C99 6.3.2.1p[2-4] for more details. 643QualType Sema::CheckSizeOfAlignOfOperand(QualType exprType, 644 SourceLocation OpLoc, 645 const SourceRange &ExprRange, 646 bool isSizeof) { 647 // C99 6.5.3.4p1: 648 if (isa<FunctionType>(exprType) && isSizeof) 649 // alignof(function) is allowed. 650 Diag(OpLoc, diag::ext_sizeof_function_type, ExprRange); 651 else if (exprType->isVoidType()) 652 Diag(OpLoc, diag::ext_sizeof_void_type, isSizeof ? "sizeof" : "__alignof", 653 ExprRange); 654 else if (exprType->isIncompleteType()) { 655 Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 656 diag::err_alignof_incomplete_type, 657 exprType.getAsString(), ExprRange); 658 return QualType(); // error 659 } 660 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 661 return Context.getSizeType(); 662} 663 664Action::ExprResult Sema:: 665ActOnSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, 666 SourceLocation LPLoc, TypeTy *Ty, 667 SourceLocation RPLoc) { 668 // If error parsing type, ignore. 669 if (Ty == 0) return true; 670 671 // Verify that this is a valid expression. 672 QualType ArgTy = QualType::getFromOpaquePtr(Ty); 673 674 QualType resultType = 675 CheckSizeOfAlignOfOperand(ArgTy, OpLoc, SourceRange(LPLoc, RPLoc),isSizeof); 676 677 if (resultType.isNull()) 678 return true; 679 return new SizeOfAlignOfTypeExpr(isSizeof, ArgTy, resultType, OpLoc, RPLoc); 680} 681 682QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 683 DefaultFunctionArrayConversion(V); 684 685 // These operators return the element type of a complex type. 686 if (const ComplexType *CT = V->getType()->getAsComplexType()) 687 return CT->getElementType(); 688 689 // Otherwise they pass through real integer and floating point types here. 690 if (V->getType()->isArithmeticType()) 691 return V->getType(); 692 693 // Reject anything else. 694 Diag(Loc, diag::err_realimag_invalid_type, V->getType().getAsString()); 695 return QualType(); 696} 697 698 699 700Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 701 tok::TokenKind Kind, 702 ExprTy *Input) { 703 UnaryOperator::Opcode Opc; 704 switch (Kind) { 705 default: assert(0 && "Unknown unary op!"); 706 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 707 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 708 } 709 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 710 if (result.isNull()) 711 return true; 712 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 713} 714 715Action::ExprResult Sema:: 716ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 717 ExprTy *Idx, SourceLocation RLoc) { 718 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 719 720 // Perform default conversions. 721 DefaultFunctionArrayConversion(LHSExp); 722 DefaultFunctionArrayConversion(RHSExp); 723 724 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 725 726 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 727 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 728 // in the subscript position. As a result, we need to derive the array base 729 // and index from the expression types. 730 Expr *BaseExpr, *IndexExpr; 731 QualType ResultType; 732 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 733 BaseExpr = LHSExp; 734 IndexExpr = RHSExp; 735 // FIXME: need to deal with const... 736 ResultType = PTy->getPointeeType(); 737 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 738 // Handle the uncommon case of "123[Ptr]". 739 BaseExpr = RHSExp; 740 IndexExpr = LHSExp; 741 // FIXME: need to deal with const... 742 ResultType = PTy->getPointeeType(); 743 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 744 BaseExpr = LHSExp; // vectors: V[123] 745 IndexExpr = RHSExp; 746 747 // Component access limited to variables (reject vec4.rg[1]). 748 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 749 !isa<ExtVectorElementExpr>(BaseExpr)) 750 return Diag(LLoc, diag::err_ext_vector_component_access, 751 SourceRange(LLoc, RLoc)); 752 // FIXME: need to deal with const... 753 ResultType = VTy->getElementType(); 754 } else { 755 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value, 756 RHSExp->getSourceRange()); 757 } 758 // C99 6.5.2.1p1 759 if (!IndexExpr->getType()->isIntegerType()) 760 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript, 761 IndexExpr->getSourceRange()); 762 763 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 764 // the following check catches trying to index a pointer to a function (e.g. 765 // void (*)(int)) and pointers to incomplete types. Functions are not 766 // objects in C99. 767 if (!ResultType->isObjectType()) 768 return Diag(BaseExpr->getLocStart(), 769 diag::err_typecheck_subscript_not_object, 770 BaseExpr->getType().getAsString(), BaseExpr->getSourceRange()); 771 772 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 773} 774 775QualType Sema:: 776CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 777 IdentifierInfo &CompName, SourceLocation CompLoc) { 778 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 779 780 // This flag determines whether or not the component is to be treated as a 781 // special name, or a regular GLSL-style component access. 782 bool SpecialComponent = false; 783 784 // The vector accessor can't exceed the number of elements. 785 const char *compStr = CompName.getName(); 786 if (strlen(compStr) > vecType->getNumElements()) { 787 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 788 baseType.getAsString(), SourceRange(CompLoc)); 789 return QualType(); 790 } 791 792 // Check that we've found one of the special components, or that the component 793 // names must come from the same set. 794 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 795 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 796 SpecialComponent = true; 797 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 798 do 799 compStr++; 800 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 801 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 802 do 803 compStr++; 804 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 805 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 806 do 807 compStr++; 808 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 809 } 810 811 if (!SpecialComponent && *compStr) { 812 // We didn't get to the end of the string. This means the component names 813 // didn't come from the same set *or* we encountered an illegal name. 814 Diag(OpLoc, diag::err_ext_vector_component_name_illegal, 815 std::string(compStr,compStr+1), SourceRange(CompLoc)); 816 return QualType(); 817 } 818 // Each component accessor can't exceed the vector type. 819 compStr = CompName.getName(); 820 while (*compStr) { 821 if (vecType->isAccessorWithinNumElements(*compStr)) 822 compStr++; 823 else 824 break; 825 } 826 if (!SpecialComponent && *compStr) { 827 // We didn't get to the end of the string. This means a component accessor 828 // exceeds the number of elements in the vector. 829 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 830 baseType.getAsString(), SourceRange(CompLoc)); 831 return QualType(); 832 } 833 834 // If we have a special component name, verify that the current vector length 835 // is an even number, since all special component names return exactly half 836 // the elements. 837 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 838 Diag(OpLoc, diag::err_ext_vector_component_requires_even, 839 baseType.getAsString(), SourceRange(CompLoc)); 840 return QualType(); 841 } 842 843 // The component accessor looks fine - now we need to compute the actual type. 844 // The vector type is implied by the component accessor. For example, 845 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 846 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 847 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 848 : strlen(CompName.getName()); 849 if (CompSize == 1) 850 return vecType->getElementType(); 851 852 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 853 // Now look up the TypeDefDecl from the vector type. Without this, 854 // diagostics look bad. We want extended vector types to appear built-in. 855 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 856 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 857 return Context.getTypedefType(ExtVectorDecls[i]); 858 } 859 return VT; // should never get here (a typedef type should always be found). 860} 861 862/// constructSetterName - Return the setter name for the given 863/// identifier, i.e. "set" + Name where the initial character of Name 864/// has been capitalized. 865// FIXME: Merge with same routine in Parser. But where should this 866// live? 867static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 868 const IdentifierInfo *Name) { 869 unsigned N = Name->getLength(); 870 char *SelectorName = new char[3 + N]; 871 memcpy(SelectorName, "set", 3); 872 memcpy(&SelectorName[3], Name->getName(), N); 873 SelectorName[3] = toupper(SelectorName[3]); 874 875 IdentifierInfo *Setter = 876 &Idents.get(SelectorName, &SelectorName[3 + N]); 877 delete[] SelectorName; 878 return Setter; 879} 880 881Action::ExprResult Sema:: 882ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 883 tok::TokenKind OpKind, SourceLocation MemberLoc, 884 IdentifierInfo &Member) { 885 Expr *BaseExpr = static_cast<Expr *>(Base); 886 assert(BaseExpr && "no record expression"); 887 888 // Perform default conversions. 889 DefaultFunctionArrayConversion(BaseExpr); 890 891 QualType BaseType = BaseExpr->getType(); 892 assert(!BaseType.isNull() && "no type for member expression"); 893 894 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 895 // must have pointer type, and the accessed type is the pointee. 896 if (OpKind == tok::arrow) { 897 if (const PointerType *PT = BaseType->getAsPointerType()) 898 BaseType = PT->getPointeeType(); 899 else 900 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow, 901 BaseType.getAsString(), BaseExpr->getSourceRange()); 902 } 903 904 // Handle field access to simple records. This also handles access to fields 905 // of the ObjC 'id' struct. 906 if (const RecordType *RTy = BaseType->getAsRecordType()) { 907 RecordDecl *RDecl = RTy->getDecl(); 908 if (RTy->isIncompleteType()) 909 return Diag(OpLoc, diag::err_typecheck_incomplete_tag, RDecl->getName(), 910 BaseExpr->getSourceRange()); 911 // The record definition is complete, now make sure the member is valid. 912 FieldDecl *MemberDecl = RDecl->getMember(&Member); 913 if (!MemberDecl) 914 return Diag(MemberLoc, diag::err_typecheck_no_member, Member.getName(), 915 BaseExpr->getSourceRange()); 916 917 // Figure out the type of the member; see C99 6.5.2.3p3 918 // FIXME: Handle address space modifiers 919 QualType MemberType = MemberDecl->getType(); 920 unsigned combinedQualifiers = 921 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 922 MemberType = MemberType.getQualifiedType(combinedQualifiers); 923 924 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 925 MemberLoc, MemberType); 926 } 927 928 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 929 // (*Obj).ivar. 930 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 931 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) 932 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 933 OpKind == tok::arrow); 934 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar, 935 IFTy->getDecl()->getName(), Member.getName(), 936 BaseExpr->getSourceRange()); 937 } 938 939 // Handle Objective-C property access, which is "Obj.property" where Obj is a 940 // pointer to a (potentially qualified) interface type. 941 const PointerType *PTy; 942 const ObjCInterfaceType *IFTy; 943 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 944 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 945 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 946 947 // Search for a declared property first. 948 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 949 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 950 951 // Check protocols on qualified interfaces. 952 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 953 E = IFTy->qual_end(); I != E; ++I) 954 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 955 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 956 957 // If that failed, look for an "implicit" property by seeing if the nullary 958 // selector is implemented. 959 960 // FIXME: The logic for looking up nullary and unary selectors should be 961 // shared with the code in ActOnInstanceMessage. 962 963 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 964 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 965 966 // If this reference is in an @implementation, check for 'private' methods. 967 if (!Getter) 968 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 969 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 970 if (ObjCImplementationDecl *ImpDecl = 971 ObjCImplementations[ClassDecl->getIdentifier()]) 972 Getter = ImpDecl->getInstanceMethod(Sel); 973 974 // Look through local category implementations associated with the class. 975 if (!Getter) { 976 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 977 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 978 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 979 } 980 } 981 if (Getter) { 982 // If we found a getter then this may be a valid dot-reference, we 983 // need to also look for the matching setter. 984 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 985 &Member); 986 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 987 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 988 989 if (!Setter) { 990 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 991 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 992 if (ObjCImplementationDecl *ImpDecl = 993 ObjCImplementations[ClassDecl->getIdentifier()]) 994 Setter = ImpDecl->getInstanceMethod(SetterSel); 995 } 996 997 // FIXME: There are some issues here. First, we are not 998 // diagnosing accesses to read-only properties because we do not 999 // know if this is a getter or setter yet. Second, we are 1000 // checking that the type of the setter matches the type we 1001 // expect. 1002 return new ObjCPropertyRefExpr(Getter, Setter, Getter->getResultType(), 1003 MemberLoc, BaseExpr); 1004 } 1005 } 1006 // Handle properties on qualified "id" protocols. 1007 const ObjCQualifiedIdType *QIdTy; 1008 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1009 // Check protocols on qualified interfaces. 1010 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1011 E = QIdTy->qual_end(); I != E; ++I) 1012 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1013 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1014 } 1015 // Handle 'field access' to vectors, such as 'V.xx'. 1016 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1017 // Component access limited to variables (reject vec4.rg.g). 1018 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1019 !isa<ExtVectorElementExpr>(BaseExpr)) 1020 return Diag(MemberLoc, diag::err_ext_vector_component_access, 1021 BaseExpr->getSourceRange()); 1022 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1023 if (ret.isNull()) 1024 return true; 1025 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1026 } 1027 1028 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union, 1029 BaseType.getAsString(), BaseExpr->getSourceRange()); 1030} 1031 1032/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1033/// This provides the location of the left/right parens and a list of comma 1034/// locations. 1035Action::ExprResult Sema:: 1036ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 1037 ExprTy **args, unsigned NumArgs, 1038 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1039 Expr *Fn = static_cast<Expr *>(fn); 1040 Expr **Args = reinterpret_cast<Expr**>(args); 1041 assert(Fn && "no function call expression"); 1042 FunctionDecl *FDecl = NULL; 1043 OverloadedFunctionDecl *Ovl = NULL; 1044 1045 // If we're directly calling a function or a set of overloaded 1046 // functions, get the appropriate declaration. 1047 { 1048 DeclRefExpr *DRExpr = NULL; 1049 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1050 DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()); 1051 else 1052 DRExpr = dyn_cast<DeclRefExpr>(Fn); 1053 1054 if (DRExpr) { 1055 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1056 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1057 } 1058 } 1059 1060 // If we have a set of overloaded functions, perform overload 1061 // resolution to pick the function. 1062 if (Ovl) { 1063 OverloadCandidateSet CandidateSet; 1064 OverloadCandidateSet::iterator Best; 1065 AddOverloadCandidates(Ovl, Args, NumArgs, CandidateSet); 1066 switch (BestViableFunction(CandidateSet, Best)) { 1067 case OR_Success: 1068 { 1069 // Success! Let the remainder of this function build a call to 1070 // the function selected by overload resolution. 1071 FDecl = Best->Function; 1072 Expr *NewFn = new DeclRefExpr(FDecl, FDecl->getType(), 1073 Fn->getSourceRange().getBegin()); 1074 delete Fn; 1075 Fn = NewFn; 1076 } 1077 break; 1078 1079 case OR_No_Viable_Function: 1080 if (CandidateSet.empty()) 1081 Diag(Fn->getSourceRange().getBegin(), 1082 diag::err_ovl_no_viable_function_in_call, Ovl->getName(), 1083 Fn->getSourceRange()); 1084 else { 1085 Diag(Fn->getSourceRange().getBegin(), 1086 diag::err_ovl_no_viable_function_in_call_with_cands, 1087 Ovl->getName(), Fn->getSourceRange()); 1088 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1089 } 1090 return true; 1091 1092 case OR_Ambiguous: 1093 Diag(Fn->getSourceRange().getBegin(), 1094 diag::err_ovl_ambiguous_call, Ovl->getName(), 1095 Fn->getSourceRange()); 1096 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1097 return true; 1098 } 1099 } 1100 1101 // Promote the function operand. 1102 UsualUnaryConversions(Fn); 1103 1104 // Make the call expr early, before semantic checks. This guarantees cleanup 1105 // of arguments and function on error. 1106 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1107 Context.BoolTy, RParenLoc)); 1108 const FunctionType *FuncT; 1109 if (!Fn->getType()->isBlockPointerType()) { 1110 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1111 // have type pointer to function". 1112 const PointerType *PT = Fn->getType()->getAsPointerType(); 1113 if (PT == 0) 1114 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1115 Fn->getSourceRange()); 1116 FuncT = PT->getPointeeType()->getAsFunctionType(); 1117 } else { // This is a block call. 1118 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1119 getAsFunctionType(); 1120 } 1121 if (FuncT == 0) 1122 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1123 Fn->getSourceRange()); 1124 1125 // We know the result type of the call, set it. 1126 TheCall->setType(FuncT->getResultType().getNonReferenceType()); 1127 1128 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1129 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1130 // assignment, to the types of the corresponding parameter, ... 1131 unsigned NumArgsInProto = Proto->getNumArgs(); 1132 unsigned NumArgsToCheck = NumArgs; 1133 1134 // If too few arguments are available (and we don't have default 1135 // arguments for the remaining parameters), don't make the call. 1136 if (NumArgs < NumArgsInProto) { 1137 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 1138 // Use default arguments for missing arguments 1139 NumArgsToCheck = NumArgsInProto; 1140 TheCall->setNumArgs(NumArgsInProto); 1141 } else 1142 return Diag(RParenLoc, 1143 !Fn->getType()->isBlockPointerType() 1144 ? diag::err_typecheck_call_too_few_args 1145 : diag::err_typecheck_block_too_few_args, 1146 Fn->getSourceRange()); 1147 } 1148 1149 // If too many are passed and not variadic, error on the extras and drop 1150 // them. 1151 if (NumArgs > NumArgsInProto) { 1152 if (!Proto->isVariadic()) { 1153 Diag(Args[NumArgsInProto]->getLocStart(), 1154 !Fn->getType()->isBlockPointerType() 1155 ? diag::err_typecheck_call_too_many_args 1156 : diag::err_typecheck_block_too_many_args, 1157 Fn->getSourceRange(), 1158 SourceRange(Args[NumArgsInProto]->getLocStart(), 1159 Args[NumArgs-1]->getLocEnd())); 1160 // This deletes the extra arguments. 1161 TheCall->setNumArgs(NumArgsInProto); 1162 } 1163 NumArgsToCheck = NumArgsInProto; 1164 } 1165 1166 // Continue to check argument types (even if we have too few/many args). 1167 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1168 QualType ProtoArgType = Proto->getArgType(i); 1169 1170 Expr *Arg; 1171 if (i < NumArgs) 1172 Arg = Args[i]; 1173 else 1174 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1175 QualType ArgType = Arg->getType(); 1176 1177 // Pass the argument. 1178 if (PerformCopyInitialization(Arg, ProtoArgType, "passing")) 1179 return true; 1180 1181 TheCall->setArg(i, Arg); 1182 } 1183 1184 // If this is a variadic call, handle args passed through "...". 1185 if (Proto->isVariadic()) { 1186 // Promote the arguments (C99 6.5.2.2p7). 1187 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1188 Expr *Arg = Args[i]; 1189 DefaultArgumentPromotion(Arg); 1190 TheCall->setArg(i, Arg); 1191 } 1192 } 1193 } else { 1194 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1195 1196 // Promote the arguments (C99 6.5.2.2p6). 1197 for (unsigned i = 0; i != NumArgs; i++) { 1198 Expr *Arg = Args[i]; 1199 DefaultArgumentPromotion(Arg); 1200 TheCall->setArg(i, Arg); 1201 } 1202 } 1203 1204 // Do special checking on direct calls to functions. 1205 if (FDecl) 1206 return CheckFunctionCall(FDecl, TheCall.take()); 1207 1208 return TheCall.take(); 1209} 1210 1211Action::ExprResult Sema:: 1212ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1213 SourceLocation RParenLoc, ExprTy *InitExpr) { 1214 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1215 QualType literalType = QualType::getFromOpaquePtr(Ty); 1216 // FIXME: put back this assert when initializers are worked out. 1217 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1218 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1219 1220 if (literalType->isArrayType()) { 1221 if (literalType->isVariableArrayType()) 1222 return Diag(LParenLoc, 1223 diag::err_variable_object_no_init, 1224 SourceRange(LParenLoc, 1225 literalExpr->getSourceRange().getEnd())); 1226 } else if (literalType->isIncompleteType()) { 1227 return Diag(LParenLoc, 1228 diag::err_typecheck_decl_incomplete_type, 1229 literalType.getAsString(), 1230 SourceRange(LParenLoc, 1231 literalExpr->getSourceRange().getEnd())); 1232 } 1233 1234 if (CheckInitializerTypes(literalExpr, literalType, LParenLoc, 1235 "temporary")) 1236 return true; 1237 1238 bool isFileScope = !getCurFunctionDecl() && !getCurMethodDecl(); 1239 if (isFileScope) { // 6.5.2.5p3 1240 if (CheckForConstantInitializer(literalExpr, literalType)) 1241 return true; 1242 } 1243 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, 1244 isFileScope); 1245} 1246 1247Action::ExprResult Sema:: 1248ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1249 InitListDesignations &Designators, 1250 SourceLocation RBraceLoc) { 1251 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1252 1253 // Semantic analysis for initializers is done by ActOnDeclarator() and 1254 // CheckInitializer() - it requires knowledge of the object being intialized. 1255 1256 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc, 1257 Designators.hasAnyDesignators()); 1258 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1259 return E; 1260} 1261 1262/// CheckCastTypes - Check type constraints for casting between types. 1263bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1264 UsualUnaryConversions(castExpr); 1265 1266 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1267 // type needs to be scalar. 1268 if (castType->isVoidType()) { 1269 // Cast to void allows any expr type. 1270 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1271 // GCC struct/union extension: allow cast to self. 1272 if (Context.getCanonicalType(castType) != 1273 Context.getCanonicalType(castExpr->getType()) || 1274 (!castType->isStructureType() && !castType->isUnionType())) { 1275 // Reject any other conversions to non-scalar types. 1276 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar, 1277 castType.getAsString(), castExpr->getSourceRange()); 1278 } 1279 1280 // accept this, but emit an ext-warn. 1281 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar, 1282 castType.getAsString(), castExpr->getSourceRange()); 1283 } else if (!castExpr->getType()->isScalarType() && 1284 !castExpr->getType()->isVectorType()) { 1285 return Diag(castExpr->getLocStart(), 1286 diag::err_typecheck_expect_scalar_operand, 1287 castExpr->getType().getAsString(),castExpr->getSourceRange()); 1288 } else if (castExpr->getType()->isVectorType()) { 1289 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1290 return true; 1291 } else if (castType->isVectorType()) { 1292 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1293 return true; 1294 } 1295 return false; 1296} 1297 1298bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1299 assert(VectorTy->isVectorType() && "Not a vector type!"); 1300 1301 if (Ty->isVectorType() || Ty->isIntegerType()) { 1302 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1303 return Diag(R.getBegin(), 1304 Ty->isVectorType() ? 1305 diag::err_invalid_conversion_between_vectors : 1306 diag::err_invalid_conversion_between_vector_and_integer, 1307 VectorTy.getAsString().c_str(), 1308 Ty.getAsString().c_str(), R); 1309 } else 1310 return Diag(R.getBegin(), 1311 diag::err_invalid_conversion_between_vector_and_scalar, 1312 VectorTy.getAsString().c_str(), 1313 Ty.getAsString().c_str(), R); 1314 1315 return false; 1316} 1317 1318Action::ExprResult Sema:: 1319ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1320 SourceLocation RParenLoc, ExprTy *Op) { 1321 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1322 1323 Expr *castExpr = static_cast<Expr*>(Op); 1324 QualType castType = QualType::getFromOpaquePtr(Ty); 1325 1326 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1327 return true; 1328 return new CStyleCastExpr(castType, castExpr, castType, LParenLoc, RParenLoc); 1329} 1330 1331/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1332/// In that case, lex = cond. 1333inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1334 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1335 UsualUnaryConversions(cond); 1336 UsualUnaryConversions(lex); 1337 UsualUnaryConversions(rex); 1338 QualType condT = cond->getType(); 1339 QualType lexT = lex->getType(); 1340 QualType rexT = rex->getType(); 1341 1342 // first, check the condition. 1343 if (!condT->isScalarType()) { // C99 6.5.15p2 1344 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 1345 condT.getAsString()); 1346 return QualType(); 1347 } 1348 1349 // Now check the two expressions. 1350 1351 // If both operands have arithmetic type, do the usual arithmetic conversions 1352 // to find a common type: C99 6.5.15p3,5. 1353 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1354 UsualArithmeticConversions(lex, rex); 1355 return lex->getType(); 1356 } 1357 1358 // If both operands are the same structure or union type, the result is that 1359 // type. 1360 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1361 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1362 if (LHSRT->getDecl() == RHSRT->getDecl()) 1363 // "If both the operands have structure or union type, the result has 1364 // that type." This implies that CV qualifiers are dropped. 1365 return lexT.getUnqualifiedType(); 1366 } 1367 1368 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1369 // The following || allows only one side to be void (a GCC-ism). 1370 if (lexT->isVoidType() || rexT->isVoidType()) { 1371 if (!lexT->isVoidType()) 1372 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 1373 rex->getSourceRange()); 1374 if (!rexT->isVoidType()) 1375 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 1376 lex->getSourceRange()); 1377 ImpCastExprToType(lex, Context.VoidTy); 1378 ImpCastExprToType(rex, Context.VoidTy); 1379 return Context.VoidTy; 1380 } 1381 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1382 // the type of the other operand." 1383 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1384 Context.isObjCObjectPointerType(lexT)) && 1385 rex->isNullPointerConstant(Context)) { 1386 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1387 return lexT; 1388 } 1389 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1390 Context.isObjCObjectPointerType(rexT)) && 1391 lex->isNullPointerConstant(Context)) { 1392 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1393 return rexT; 1394 } 1395 // Handle the case where both operands are pointers before we handle null 1396 // pointer constants in case both operands are null pointer constants. 1397 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1398 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1399 // get the "pointed to" types 1400 QualType lhptee = LHSPT->getPointeeType(); 1401 QualType rhptee = RHSPT->getPointeeType(); 1402 1403 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1404 if (lhptee->isVoidType() && 1405 rhptee->isIncompleteOrObjectType()) { 1406 // Figure out necessary qualifiers (C99 6.5.15p6) 1407 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1408 QualType destType = Context.getPointerType(destPointee); 1409 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1410 ImpCastExprToType(rex, destType); // promote to void* 1411 return destType; 1412 } 1413 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1414 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1415 QualType destType = Context.getPointerType(destPointee); 1416 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1417 ImpCastExprToType(rex, destType); // promote to void* 1418 return destType; 1419 } 1420 1421 QualType compositeType = lexT; 1422 1423 // If either type is an Objective-C object type then check 1424 // compatibility according to Objective-C. 1425 if (Context.isObjCObjectPointerType(lexT) || 1426 Context.isObjCObjectPointerType(rexT)) { 1427 // If both operands are interfaces and either operand can be 1428 // assigned to the other, use that type as the composite 1429 // type. This allows 1430 // xxx ? (A*) a : (B*) b 1431 // where B is a subclass of A. 1432 // 1433 // Additionally, as for assignment, if either type is 'id' 1434 // allow silent coercion. Finally, if the types are 1435 // incompatible then make sure to use 'id' as the composite 1436 // type so the result is acceptable for sending messages to. 1437 1438 // FIXME: This code should not be localized to here. Also this 1439 // should use a compatible check instead of abusing the 1440 // canAssignObjCInterfaces code. 1441 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1442 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1443 if (LHSIface && RHSIface && 1444 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1445 compositeType = lexT; 1446 } else if (LHSIface && RHSIface && 1447 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1448 compositeType = rexT; 1449 } else if (Context.isObjCIdType(lhptee) || 1450 Context.isObjCIdType(rhptee)) { 1451 // FIXME: This code looks wrong, because isObjCIdType checks 1452 // the struct but getObjCIdType returns the pointer to 1453 // struct. This is horrible and should be fixed. 1454 compositeType = Context.getObjCIdType(); 1455 } else { 1456 QualType incompatTy = Context.getObjCIdType(); 1457 ImpCastExprToType(lex, incompatTy); 1458 ImpCastExprToType(rex, incompatTy); 1459 return incompatTy; 1460 } 1461 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1462 rhptee.getUnqualifiedType())) { 1463 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 1464 lexT.getAsString(), rexT.getAsString(), 1465 lex->getSourceRange(), rex->getSourceRange()); 1466 // In this situation, we assume void* type. No especially good 1467 // reason, but this is what gcc does, and we do have to pick 1468 // to get a consistent AST. 1469 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1470 ImpCastExprToType(lex, incompatTy); 1471 ImpCastExprToType(rex, incompatTy); 1472 return incompatTy; 1473 } 1474 // The pointer types are compatible. 1475 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1476 // differently qualified versions of compatible types, the result type is 1477 // a pointer to an appropriately qualified version of the *composite* 1478 // type. 1479 // FIXME: Need to calculate the composite type. 1480 // FIXME: Need to add qualifiers 1481 ImpCastExprToType(lex, compositeType); 1482 ImpCastExprToType(rex, compositeType); 1483 return compositeType; 1484 } 1485 } 1486 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1487 // evaluates to "struct objc_object *" (and is handled above when comparing 1488 // id with statically typed objects). 1489 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1490 // GCC allows qualified id and any Objective-C type to devolve to 1491 // id. Currently localizing to here until clear this should be 1492 // part of ObjCQualifiedIdTypesAreCompatible. 1493 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1494 (lexT->isObjCQualifiedIdType() && 1495 Context.isObjCObjectPointerType(rexT)) || 1496 (rexT->isObjCQualifiedIdType() && 1497 Context.isObjCObjectPointerType(lexT))) { 1498 // FIXME: This is not the correct composite type. This only 1499 // happens to work because id can more or less be used anywhere, 1500 // however this may change the type of method sends. 1501 // FIXME: gcc adds some type-checking of the arguments and emits 1502 // (confusing) incompatible comparison warnings in some 1503 // cases. Investigate. 1504 QualType compositeType = Context.getObjCIdType(); 1505 ImpCastExprToType(lex, compositeType); 1506 ImpCastExprToType(rex, compositeType); 1507 return compositeType; 1508 } 1509 } 1510 1511 // Selection between block pointer types is ok as long as they are the same. 1512 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1513 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1514 return lexT; 1515 1516 // Otherwise, the operands are not compatible. 1517 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 1518 lexT.getAsString(), rexT.getAsString(), 1519 lex->getSourceRange(), rex->getSourceRange()); 1520 return QualType(); 1521} 1522 1523/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1524/// in the case of a the GNU conditional expr extension. 1525Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1526 SourceLocation ColonLoc, 1527 ExprTy *Cond, ExprTy *LHS, 1528 ExprTy *RHS) { 1529 Expr *CondExpr = (Expr *) Cond; 1530 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1531 1532 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1533 // was the condition. 1534 bool isLHSNull = LHSExpr == 0; 1535 if (isLHSNull) 1536 LHSExpr = CondExpr; 1537 1538 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1539 RHSExpr, QuestionLoc); 1540 if (result.isNull()) 1541 return true; 1542 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1543 RHSExpr, result); 1544} 1545 1546 1547// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1548// being closely modeled after the C99 spec:-). The odd characteristic of this 1549// routine is it effectively iqnores the qualifiers on the top level pointee. 1550// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1551// FIXME: add a couple examples in this comment. 1552Sema::AssignConvertType 1553Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1554 QualType lhptee, rhptee; 1555 1556 // get the "pointed to" type (ignoring qualifiers at the top level) 1557 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1558 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1559 1560 // make sure we operate on the canonical type 1561 lhptee = Context.getCanonicalType(lhptee); 1562 rhptee = Context.getCanonicalType(rhptee); 1563 1564 AssignConvertType ConvTy = Compatible; 1565 1566 // C99 6.5.16.1p1: This following citation is common to constraints 1567 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1568 // qualifiers of the type *pointed to* by the right; 1569 // FIXME: Handle ASQualType 1570 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 1571 ConvTy = CompatiblePointerDiscardsQualifiers; 1572 1573 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1574 // incomplete type and the other is a pointer to a qualified or unqualified 1575 // version of void... 1576 if (lhptee->isVoidType()) { 1577 if (rhptee->isIncompleteOrObjectType()) 1578 return ConvTy; 1579 1580 // As an extension, we allow cast to/from void* to function pointer. 1581 assert(rhptee->isFunctionType()); 1582 return FunctionVoidPointer; 1583 } 1584 1585 if (rhptee->isVoidType()) { 1586 if (lhptee->isIncompleteOrObjectType()) 1587 return ConvTy; 1588 1589 // As an extension, we allow cast to/from void* to function pointer. 1590 assert(lhptee->isFunctionType()); 1591 return FunctionVoidPointer; 1592 } 1593 1594 // Check for ObjC interfaces 1595 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1596 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1597 if (LHSIface && RHSIface && 1598 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1599 return ConvTy; 1600 1601 // ID acts sort of like void* for ObjC interfaces 1602 if (LHSIface && Context.isObjCIdType(rhptee)) 1603 return ConvTy; 1604 if (RHSIface && Context.isObjCIdType(lhptee)) 1605 return ConvTy; 1606 1607 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1608 // unqualified versions of compatible types, ... 1609 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1610 rhptee.getUnqualifiedType())) 1611 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1612 return ConvTy; 1613} 1614 1615/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1616/// block pointer types are compatible or whether a block and normal pointer 1617/// are compatible. It is more restrict than comparing two function pointer 1618// types. 1619Sema::AssignConvertType 1620Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1621 QualType rhsType) { 1622 QualType lhptee, rhptee; 1623 1624 // get the "pointed to" type (ignoring qualifiers at the top level) 1625 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1626 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1627 1628 // make sure we operate on the canonical type 1629 lhptee = Context.getCanonicalType(lhptee); 1630 rhptee = Context.getCanonicalType(rhptee); 1631 1632 AssignConvertType ConvTy = Compatible; 1633 1634 // For blocks we enforce that qualifiers are identical. 1635 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1636 ConvTy = CompatiblePointerDiscardsQualifiers; 1637 1638 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1639 return IncompatibleBlockPointer; 1640 return ConvTy; 1641} 1642 1643/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1644/// has code to accommodate several GCC extensions when type checking 1645/// pointers. Here are some objectionable examples that GCC considers warnings: 1646/// 1647/// int a, *pint; 1648/// short *pshort; 1649/// struct foo *pfoo; 1650/// 1651/// pint = pshort; // warning: assignment from incompatible pointer type 1652/// a = pint; // warning: assignment makes integer from pointer without a cast 1653/// pint = a; // warning: assignment makes pointer from integer without a cast 1654/// pint = pfoo; // warning: assignment from incompatible pointer type 1655/// 1656/// As a result, the code for dealing with pointers is more complex than the 1657/// C99 spec dictates. 1658/// 1659Sema::AssignConvertType 1660Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1661 // Get canonical types. We're not formatting these types, just comparing 1662 // them. 1663 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1664 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1665 1666 if (lhsType == rhsType) 1667 return Compatible; // Common case: fast path an exact match. 1668 1669 // If the left-hand side is a reference type, then we are in a 1670 // (rare!) case where we've allowed the use of references in C, 1671 // e.g., as a parameter type in a built-in function. In this case, 1672 // just make sure that the type referenced is compatible with the 1673 // right-hand side type. The caller is responsible for adjusting 1674 // lhsType so that the resulting expression does not have reference 1675 // type. 1676 if (const ReferenceType *lhsTypeRef = lhsType->getAsReferenceType()) { 1677 if (Context.typesAreCompatible(lhsTypeRef->getPointeeType(), rhsType)) 1678 return Compatible; 1679 return Incompatible; 1680 } 1681 1682 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1683 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1684 return Compatible; 1685 // Relax integer conversions like we do for pointers below. 1686 if (rhsType->isIntegerType()) 1687 return IntToPointer; 1688 if (lhsType->isIntegerType()) 1689 return PointerToInt; 1690 return IncompatibleObjCQualifiedId; 1691 } 1692 1693 if (lhsType->isVectorType() || rhsType->isVectorType()) { 1694 // For ExtVector, allow vector splats; float -> <n x float> 1695 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 1696 if (LV->getElementType() == rhsType) 1697 return Compatible; 1698 1699 // If we are allowing lax vector conversions, and LHS and RHS are both 1700 // vectors, the total size only needs to be the same. This is a bitcast; 1701 // no bits are changed but the result type is different. 1702 if (getLangOptions().LaxVectorConversions && 1703 lhsType->isVectorType() && rhsType->isVectorType()) { 1704 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1705 return Compatible; 1706 } 1707 return Incompatible; 1708 } 1709 1710 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1711 return Compatible; 1712 1713 if (isa<PointerType>(lhsType)) { 1714 if (rhsType->isIntegerType()) 1715 return IntToPointer; 1716 1717 if (isa<PointerType>(rhsType)) 1718 return CheckPointerTypesForAssignment(lhsType, rhsType); 1719 1720 if (rhsType->getAsBlockPointerType()) { 1721 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1722 return BlockVoidPointer; 1723 1724 // Treat block pointers as objects. 1725 if (getLangOptions().ObjC1 && 1726 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 1727 return Compatible; 1728 } 1729 return Incompatible; 1730 } 1731 1732 if (isa<BlockPointerType>(lhsType)) { 1733 if (rhsType->isIntegerType()) 1734 return IntToPointer; 1735 1736 // Treat block pointers as objects. 1737 if (getLangOptions().ObjC1 && 1738 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 1739 return Compatible; 1740 1741 if (rhsType->isBlockPointerType()) 1742 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 1743 1744 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 1745 if (RHSPT->getPointeeType()->isVoidType()) 1746 return BlockVoidPointer; 1747 } 1748 return Incompatible; 1749 } 1750 1751 if (isa<PointerType>(rhsType)) { 1752 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1753 if (lhsType == Context.BoolTy) 1754 return Compatible; 1755 1756 if (lhsType->isIntegerType()) 1757 return PointerToInt; 1758 1759 if (isa<PointerType>(lhsType)) 1760 return CheckPointerTypesForAssignment(lhsType, rhsType); 1761 1762 if (isa<BlockPointerType>(lhsType) && 1763 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1764 return BlockVoidPointer; 1765 return Incompatible; 1766 } 1767 1768 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1769 if (Context.typesAreCompatible(lhsType, rhsType)) 1770 return Compatible; 1771 } 1772 return Incompatible; 1773} 1774 1775Sema::AssignConvertType 1776Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1777 if (getLangOptions().CPlusPlus) { 1778 if (!lhsType->isRecordType()) { 1779 // C++ 5.17p3: If the left operand is not of class type, the 1780 // expression is implicitly converted (C++ 4) to the 1781 // cv-unqualified type of the left operand. 1782 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType())) 1783 return Incompatible; 1784 else 1785 return Compatible; 1786 } 1787 1788 // FIXME: Currently, we fall through and treat C++ classes like C 1789 // structures. 1790 } 1791 1792 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1793 // a null pointer constant. 1794 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 1795 lhsType->isBlockPointerType()) 1796 && rExpr->isNullPointerConstant(Context)) { 1797 ImpCastExprToType(rExpr, lhsType); 1798 return Compatible; 1799 } 1800 1801 // We don't allow conversion of non-null-pointer constants to integers. 1802 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 1803 return IntToBlockPointer; 1804 1805 // This check seems unnatural, however it is necessary to ensure the proper 1806 // conversion of functions/arrays. If the conversion were done for all 1807 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1808 // expressions that surpress this implicit conversion (&, sizeof). 1809 // 1810 // Suppress this for references: C++ 8.5.3p5. 1811 if (!lhsType->isReferenceType()) 1812 DefaultFunctionArrayConversion(rExpr); 1813 1814 Sema::AssignConvertType result = 1815 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1816 1817 // C99 6.5.16.1p2: The value of the right operand is converted to the 1818 // type of the assignment expression. 1819 // CheckAssignmentConstraints allows the left-hand side to be a reference, 1820 // so that we can use references in built-in functions even in C. 1821 // The getNonReferenceType() call makes sure that the resulting expression 1822 // does not have reference type. 1823 if (rExpr->getType() != lhsType) 1824 ImpCastExprToType(rExpr, lhsType.getNonReferenceType()); 1825 return result; 1826} 1827 1828Sema::AssignConvertType 1829Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1830 return CheckAssignmentConstraints(lhsType, rhsType); 1831} 1832 1833QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1834 Diag(loc, diag::err_typecheck_invalid_operands, 1835 lex->getType().getAsString(), rex->getType().getAsString(), 1836 lex->getSourceRange(), rex->getSourceRange()); 1837 return QualType(); 1838} 1839 1840inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1841 Expr *&rex) { 1842 // For conversion purposes, we ignore any qualifiers. 1843 // For example, "const float" and "float" are equivalent. 1844 QualType lhsType = 1845 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 1846 QualType rhsType = 1847 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 1848 1849 // If the vector types are identical, return. 1850 if (lhsType == rhsType) 1851 return lhsType; 1852 1853 // Handle the case of a vector & extvector type of the same size and element 1854 // type. It would be nice if we only had one vector type someday. 1855 if (getLangOptions().LaxVectorConversions) 1856 if (const VectorType *LV = lhsType->getAsVectorType()) 1857 if (const VectorType *RV = rhsType->getAsVectorType()) 1858 if (LV->getElementType() == RV->getElementType() && 1859 LV->getNumElements() == RV->getNumElements()) 1860 return lhsType->isExtVectorType() ? lhsType : rhsType; 1861 1862 // If the lhs is an extended vector and the rhs is a scalar of the same type 1863 // or a literal, promote the rhs to the vector type. 1864 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1865 QualType eltType = V->getElementType(); 1866 1867 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 1868 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 1869 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 1870 ImpCastExprToType(rex, lhsType); 1871 return lhsType; 1872 } 1873 } 1874 1875 // If the rhs is an extended vector and the lhs is a scalar of the same type, 1876 // promote the lhs to the vector type. 1877 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1878 QualType eltType = V->getElementType(); 1879 1880 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 1881 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 1882 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 1883 ImpCastExprToType(lex, rhsType); 1884 return rhsType; 1885 } 1886 } 1887 1888 // You cannot convert between vector values of different size. 1889 Diag(loc, diag::err_typecheck_vector_not_convertable, 1890 lex->getType().getAsString(), rex->getType().getAsString(), 1891 lex->getSourceRange(), rex->getSourceRange()); 1892 return QualType(); 1893} 1894 1895inline QualType Sema::CheckMultiplyDivideOperands( 1896 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1897{ 1898 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1899 1900 if (lhsType->isVectorType() || rhsType->isVectorType()) 1901 return CheckVectorOperands(loc, lex, rex); 1902 1903 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1904 1905 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1906 return compType; 1907 return InvalidOperands(loc, lex, rex); 1908} 1909 1910inline QualType Sema::CheckRemainderOperands( 1911 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1912{ 1913 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1914 1915 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1916 1917 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1918 return compType; 1919 return InvalidOperands(loc, lex, rex); 1920} 1921 1922inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1923 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1924{ 1925 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1926 return CheckVectorOperands(loc, lex, rex); 1927 1928 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1929 1930 // handle the common case first (both operands are arithmetic). 1931 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1932 return compType; 1933 1934 // Put any potential pointer into PExp 1935 Expr* PExp = lex, *IExp = rex; 1936 if (IExp->getType()->isPointerType()) 1937 std::swap(PExp, IExp); 1938 1939 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1940 if (IExp->getType()->isIntegerType()) { 1941 // Check for arithmetic on pointers to incomplete types 1942 if (!PTy->getPointeeType()->isObjectType()) { 1943 if (PTy->getPointeeType()->isVoidType()) { 1944 Diag(loc, diag::ext_gnu_void_ptr, 1945 lex->getSourceRange(), rex->getSourceRange()); 1946 } else { 1947 Diag(loc, diag::err_typecheck_arithmetic_incomplete_type, 1948 lex->getType().getAsString(), lex->getSourceRange()); 1949 return QualType(); 1950 } 1951 } 1952 return PExp->getType(); 1953 } 1954 } 1955 1956 return InvalidOperands(loc, lex, rex); 1957} 1958 1959// C99 6.5.6 1960QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1961 SourceLocation loc, bool isCompAssign) { 1962 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1963 return CheckVectorOperands(loc, lex, rex); 1964 1965 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1966 1967 // Enforce type constraints: C99 6.5.6p3. 1968 1969 // Handle the common case first (both operands are arithmetic). 1970 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1971 return compType; 1972 1973 // Either ptr - int or ptr - ptr. 1974 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1975 QualType lpointee = LHSPTy->getPointeeType(); 1976 1977 // The LHS must be an object type, not incomplete, function, etc. 1978 if (!lpointee->isObjectType()) { 1979 // Handle the GNU void* extension. 1980 if (lpointee->isVoidType()) { 1981 Diag(loc, diag::ext_gnu_void_ptr, 1982 lex->getSourceRange(), rex->getSourceRange()); 1983 } else { 1984 Diag(loc, diag::err_typecheck_sub_ptr_object, 1985 lex->getType().getAsString(), lex->getSourceRange()); 1986 return QualType(); 1987 } 1988 } 1989 1990 // The result type of a pointer-int computation is the pointer type. 1991 if (rex->getType()->isIntegerType()) 1992 return lex->getType(); 1993 1994 // Handle pointer-pointer subtractions. 1995 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 1996 QualType rpointee = RHSPTy->getPointeeType(); 1997 1998 // RHS must be an object type, unless void (GNU). 1999 if (!rpointee->isObjectType()) { 2000 // Handle the GNU void* extension. 2001 if (rpointee->isVoidType()) { 2002 if (!lpointee->isVoidType()) 2003 Diag(loc, diag::ext_gnu_void_ptr, 2004 lex->getSourceRange(), rex->getSourceRange()); 2005 } else { 2006 Diag(loc, diag::err_typecheck_sub_ptr_object, 2007 rex->getType().getAsString(), rex->getSourceRange()); 2008 return QualType(); 2009 } 2010 } 2011 2012 // Pointee types must be compatible. 2013 if (!Context.typesAreCompatible( 2014 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2015 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2016 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 2017 lex->getType().getAsString(), rex->getType().getAsString(), 2018 lex->getSourceRange(), rex->getSourceRange()); 2019 return QualType(); 2020 } 2021 2022 return Context.getPointerDiffType(); 2023 } 2024 } 2025 2026 return InvalidOperands(loc, lex, rex); 2027} 2028 2029// C99 6.5.7 2030QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 2031 bool isCompAssign) { 2032 // C99 6.5.7p2: Each of the operands shall have integer type. 2033 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2034 return InvalidOperands(loc, lex, rex); 2035 2036 // Shifts don't perform usual arithmetic conversions, they just do integer 2037 // promotions on each operand. C99 6.5.7p3 2038 if (!isCompAssign) 2039 UsualUnaryConversions(lex); 2040 UsualUnaryConversions(rex); 2041 2042 // "The type of the result is that of the promoted left operand." 2043 return lex->getType(); 2044} 2045 2046static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 2047 ASTContext& Context) { 2048 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2049 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2050 // ID acts sort of like void* for ObjC interfaces 2051 if (LHSIface && Context.isObjCIdType(RHS)) 2052 return true; 2053 if (RHSIface && Context.isObjCIdType(LHS)) 2054 return true; 2055 if (!LHSIface || !RHSIface) 2056 return false; 2057 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 2058 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 2059} 2060 2061// C99 6.5.8 2062QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 2063 bool isRelational) { 2064 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2065 return CheckVectorCompareOperands(lex, rex, loc, isRelational); 2066 2067 // C99 6.5.8p3 / C99 6.5.9p4 2068 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2069 UsualArithmeticConversions(lex, rex); 2070 else { 2071 UsualUnaryConversions(lex); 2072 UsualUnaryConversions(rex); 2073 } 2074 QualType lType = lex->getType(); 2075 QualType rType = rex->getType(); 2076 2077 // For non-floating point types, check for self-comparisons of the form 2078 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2079 // often indicate logic errors in the program. 2080 if (!lType->isFloatingType()) { 2081 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2082 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2083 if (DRL->getDecl() == DRR->getDecl()) 2084 Diag(loc, diag::warn_selfcomparison); 2085 } 2086 2087 if (isRelational) { 2088 if (lType->isRealType() && rType->isRealType()) 2089 return Context.IntTy; 2090 } else { 2091 // Check for comparisons of floating point operands using != and ==. 2092 if (lType->isFloatingType()) { 2093 assert (rType->isFloatingType()); 2094 CheckFloatComparison(loc,lex,rex); 2095 } 2096 2097 if (lType->isArithmeticType() && rType->isArithmeticType()) 2098 return Context.IntTy; 2099 } 2100 2101 bool LHSIsNull = lex->isNullPointerConstant(Context); 2102 bool RHSIsNull = rex->isNullPointerConstant(Context); 2103 2104 // All of the following pointer related warnings are GCC extensions, except 2105 // when handling null pointer constants. One day, we can consider making them 2106 // errors (when -pedantic-errors is enabled). 2107 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2108 QualType LCanPointeeTy = 2109 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2110 QualType RCanPointeeTy = 2111 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2112 2113 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2114 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2115 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2116 RCanPointeeTy.getUnqualifiedType()) && 2117 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2118 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2119 lType.getAsString(), rType.getAsString(), 2120 lex->getSourceRange(), rex->getSourceRange()); 2121 } 2122 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2123 return Context.IntTy; 2124 } 2125 // Handle block pointer types. 2126 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2127 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2128 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2129 2130 if (!LHSIsNull && !RHSIsNull && 2131 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2132 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 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 // Allow block pointers to be compared with null pointer constants. 2140 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2141 (lType->isPointerType() && rType->isBlockPointerType())) { 2142 if (!LHSIsNull && !RHSIsNull) { 2143 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2144 lType.getAsString(), rType.getAsString(), 2145 lex->getSourceRange(), rex->getSourceRange()); 2146 } 2147 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2148 return Context.IntTy; 2149 } 2150 2151 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2152 if (lType->isPointerType() || rType->isPointerType()) { 2153 if (!Context.typesAreCompatible(lType, rType)) { 2154 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2155 lType.getAsString(), rType.getAsString(), 2156 lex->getSourceRange(), rex->getSourceRange()); 2157 ImpCastExprToType(rex, lType); 2158 return Context.IntTy; 2159 } 2160 ImpCastExprToType(rex, lType); 2161 return Context.IntTy; 2162 } 2163 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2164 ImpCastExprToType(rex, lType); 2165 return Context.IntTy; 2166 } else { 2167 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2168 Diag(loc, diag::warn_incompatible_qualified_id_operands, 2169 lType.getAsString(), rType.getAsString(), 2170 lex->getSourceRange(), rex->getSourceRange()); 2171 ImpCastExprToType(rex, lType); 2172 return Context.IntTy; 2173 } 2174 } 2175 } 2176 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2177 rType->isIntegerType()) { 2178 if (!RHSIsNull) 2179 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2180 lType.getAsString(), rType.getAsString(), 2181 lex->getSourceRange(), rex->getSourceRange()); 2182 ImpCastExprToType(rex, lType); // promote the integer to pointer 2183 return Context.IntTy; 2184 } 2185 if (lType->isIntegerType() && 2186 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2187 if (!LHSIsNull) 2188 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2189 lType.getAsString(), rType.getAsString(), 2190 lex->getSourceRange(), rex->getSourceRange()); 2191 ImpCastExprToType(lex, rType); // promote the integer to pointer 2192 return Context.IntTy; 2193 } 2194 // Handle block pointers. 2195 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2196 if (!RHSIsNull) 2197 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2198 lType.getAsString(), rType.getAsString(), 2199 lex->getSourceRange(), rex->getSourceRange()); 2200 ImpCastExprToType(rex, lType); // promote the integer to pointer 2201 return Context.IntTy; 2202 } 2203 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2204 if (!LHSIsNull) 2205 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2206 lType.getAsString(), rType.getAsString(), 2207 lex->getSourceRange(), rex->getSourceRange()); 2208 ImpCastExprToType(lex, rType); // promote the integer to pointer 2209 return Context.IntTy; 2210 } 2211 return InvalidOperands(loc, lex, rex); 2212} 2213 2214/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2215/// operates on extended vector types. Instead of producing an IntTy result, 2216/// like a scalar comparison, a vector comparison produces a vector of integer 2217/// types. 2218QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2219 SourceLocation loc, 2220 bool isRelational) { 2221 // Check to make sure we're operating on vectors of the same type and width, 2222 // Allowing one side to be a scalar of element type. 2223 QualType vType = CheckVectorOperands(loc, lex, rex); 2224 if (vType.isNull()) 2225 return vType; 2226 2227 QualType lType = lex->getType(); 2228 QualType rType = rex->getType(); 2229 2230 // For non-floating point types, check for self-comparisons of the form 2231 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2232 // often indicate logic errors in the program. 2233 if (!lType->isFloatingType()) { 2234 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2235 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2236 if (DRL->getDecl() == DRR->getDecl()) 2237 Diag(loc, diag::warn_selfcomparison); 2238 } 2239 2240 // Check for comparisons of floating point operands using != and ==. 2241 if (!isRelational && lType->isFloatingType()) { 2242 assert (rType->isFloatingType()); 2243 CheckFloatComparison(loc,lex,rex); 2244 } 2245 2246 // Return the type for the comparison, which is the same as vector type for 2247 // integer vectors, or an integer type of identical size and number of 2248 // elements for floating point vectors. 2249 if (lType->isIntegerType()) 2250 return lType; 2251 2252 const VectorType *VTy = lType->getAsVectorType(); 2253 2254 // FIXME: need to deal with non-32b int / non-64b long long 2255 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2256 if (TypeSize == 32) { 2257 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2258 } 2259 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2260 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2261} 2262 2263inline QualType Sema::CheckBitwiseOperands( 2264 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 2265{ 2266 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2267 return CheckVectorOperands(loc, lex, rex); 2268 2269 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2270 2271 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2272 return compType; 2273 return InvalidOperands(loc, lex, rex); 2274} 2275 2276inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2277 Expr *&lex, Expr *&rex, SourceLocation loc) 2278{ 2279 UsualUnaryConversions(lex); 2280 UsualUnaryConversions(rex); 2281 2282 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2283 return Context.IntTy; 2284 return InvalidOperands(loc, lex, rex); 2285} 2286 2287inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 2288 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 2289{ 2290 QualType lhsType = lex->getType(); 2291 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 2292 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(Context); 2293 2294 switch (mlval) { // C99 6.5.16p2 2295 case Expr::MLV_Valid: 2296 break; 2297 case Expr::MLV_ConstQualified: 2298 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 2299 return QualType(); 2300 case Expr::MLV_ArrayType: 2301 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 2302 lhsType.getAsString(), lex->getSourceRange()); 2303 return QualType(); 2304 case Expr::MLV_NotObjectType: 2305 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 2306 lhsType.getAsString(), lex->getSourceRange()); 2307 return QualType(); 2308 case Expr::MLV_InvalidExpression: 2309 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 2310 lex->getSourceRange()); 2311 return QualType(); 2312 case Expr::MLV_IncompleteType: 2313 case Expr::MLV_IncompleteVoidType: 2314 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 2315 lhsType.getAsString(), lex->getSourceRange()); 2316 return QualType(); 2317 case Expr::MLV_DuplicateVectorComponents: 2318 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 2319 lex->getSourceRange()); 2320 return QualType(); 2321 case Expr::MLV_NotBlockQualified: 2322 Diag(loc, diag::err_block_decl_ref_not_modifiable_lvalue, 2323 lex->getSourceRange()); 2324 return QualType(); 2325 } 2326 2327 AssignConvertType ConvTy; 2328 if (compoundType.isNull()) { 2329 // Simple assignment "x = y". 2330 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 2331 2332 // If the RHS is a unary plus or minus, check to see if they = and + are 2333 // right next to each other. If so, the user may have typo'd "x =+ 4" 2334 // instead of "x += 4". 2335 Expr *RHSCheck = rex; 2336 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2337 RHSCheck = ICE->getSubExpr(); 2338 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2339 if ((UO->getOpcode() == UnaryOperator::Plus || 2340 UO->getOpcode() == UnaryOperator::Minus) && 2341 loc.isFileID() && UO->getOperatorLoc().isFileID() && 2342 // Only if the two operators are exactly adjacent. 2343 loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2344 Diag(loc, diag::warn_not_compound_assign, 2345 UO->getOpcode() == UnaryOperator::Plus ? "+" : "-", 2346 SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc())); 2347 } 2348 } else { 2349 // Compound assignment "x += y" 2350 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 2351 } 2352 2353 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 2354 rex, "assigning")) 2355 return QualType(); 2356 2357 // C99 6.5.16p3: The type of an assignment expression is the type of the 2358 // left operand unless the left operand has qualified type, in which case 2359 // it is the unqualified version of the type of the left operand. 2360 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2361 // is converted to the type of the assignment expression (above). 2362 // C++ 5.17p1: the type of the assignment expression is that of its left 2363 // oprdu. 2364 return lhsType.getUnqualifiedType(); 2365} 2366 2367inline QualType Sema::CheckCommaOperands( // C99 6.5.17 2368 Expr *&lex, Expr *&rex, SourceLocation loc) { 2369 2370 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2371 DefaultFunctionArrayConversion(rex); 2372 return rex->getType(); 2373} 2374 2375/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2376/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2377QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 2378 QualType resType = op->getType(); 2379 assert(!resType.isNull() && "no type for increment/decrement expression"); 2380 2381 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2382 if (const PointerType *pt = resType->getAsPointerType()) { 2383 if (pt->getPointeeType()->isVoidType()) { 2384 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 2385 } else if (!pt->getPointeeType()->isObjectType()) { 2386 // C99 6.5.2.4p2, 6.5.6p2 2387 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 2388 resType.getAsString(), op->getSourceRange()); 2389 return QualType(); 2390 } 2391 } else if (!resType->isRealType()) { 2392 if (resType->isComplexType()) 2393 // C99 does not support ++/-- on complex types. 2394 Diag(OpLoc, diag::ext_integer_increment_complex, 2395 resType.getAsString(), op->getSourceRange()); 2396 else { 2397 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 2398 resType.getAsString(), op->getSourceRange()); 2399 return QualType(); 2400 } 2401 } 2402 // At this point, we know we have a real, complex or pointer type. 2403 // Now make sure the operand is a modifiable lvalue. 2404 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(Context); 2405 if (mlval != Expr::MLV_Valid) { 2406 // FIXME: emit a more precise diagnostic... 2407 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 2408 op->getSourceRange()); 2409 return QualType(); 2410 } 2411 return resType; 2412} 2413 2414/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2415/// This routine allows us to typecheck complex/recursive expressions 2416/// where the declaration is needed for type checking. We only need to 2417/// handle cases when the expression references a function designator 2418/// or is an lvalue. Here are some examples: 2419/// - &(x) => x 2420/// - &*****f => f for f a function designator. 2421/// - &s.xx => s 2422/// - &s.zz[1].yy -> s, if zz is an array 2423/// - *(x + 1) -> x, if x is an array 2424/// - &"123"[2] -> 0 2425/// - & __real__ x -> x 2426static NamedDecl *getPrimaryDecl(Expr *E) { 2427 switch (E->getStmtClass()) { 2428 case Stmt::DeclRefExprClass: 2429 return cast<DeclRefExpr>(E)->getDecl(); 2430 case Stmt::MemberExprClass: 2431 // Fields cannot be declared with a 'register' storage class. 2432 // &X->f is always ok, even if X is declared register. 2433 if (cast<MemberExpr>(E)->isArrow()) 2434 return 0; 2435 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2436 case Stmt::ArraySubscriptExprClass: { 2437 // &X[4] and &4[X] refers to X if X is not a pointer. 2438 2439 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2440 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 2441 if (!VD || VD->getType()->isPointerType()) 2442 return 0; 2443 else 2444 return VD; 2445 } 2446 case Stmt::UnaryOperatorClass: { 2447 UnaryOperator *UO = cast<UnaryOperator>(E); 2448 2449 switch(UO->getOpcode()) { 2450 case UnaryOperator::Deref: { 2451 // *(X + 1) refers to X if X is not a pointer. 2452 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 2453 ValueDecl *VD = dyn_cast<ValueDecl>(D); 2454 if (!VD || VD->getType()->isPointerType()) 2455 return 0; 2456 return VD; 2457 } 2458 return 0; 2459 } 2460 case UnaryOperator::Real: 2461 case UnaryOperator::Imag: 2462 case UnaryOperator::Extension: 2463 return getPrimaryDecl(UO->getSubExpr()); 2464 default: 2465 return 0; 2466 } 2467 } 2468 case Stmt::BinaryOperatorClass: { 2469 BinaryOperator *BO = cast<BinaryOperator>(E); 2470 2471 // Handle cases involving pointer arithmetic. The result of an 2472 // Assign or AddAssign is not an lvalue so they can be ignored. 2473 2474 // (x + n) or (n + x) => x 2475 if (BO->getOpcode() == BinaryOperator::Add) { 2476 if (BO->getLHS()->getType()->isPointerType()) { 2477 return getPrimaryDecl(BO->getLHS()); 2478 } else if (BO->getRHS()->getType()->isPointerType()) { 2479 return getPrimaryDecl(BO->getRHS()); 2480 } 2481 } 2482 2483 return 0; 2484 } 2485 case Stmt::ParenExprClass: 2486 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2487 case Stmt::ImplicitCastExprClass: 2488 // &X[4] when X is an array, has an implicit cast from array to pointer. 2489 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2490 default: 2491 return 0; 2492 } 2493} 2494 2495/// CheckAddressOfOperand - The operand of & must be either a function 2496/// designator or an lvalue designating an object. If it is an lvalue, the 2497/// object cannot be declared with storage class register or be a bit field. 2498/// Note: The usual conversions are *not* applied to the operand of the & 2499/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2500QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2501 if (getLangOptions().C99) { 2502 // Implement C99-only parts of addressof rules. 2503 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2504 if (uOp->getOpcode() == UnaryOperator::Deref) 2505 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2506 // (assuming the deref expression is valid). 2507 return uOp->getSubExpr()->getType(); 2508 } 2509 // Technically, there should be a check for array subscript 2510 // expressions here, but the result of one is always an lvalue anyway. 2511 } 2512 NamedDecl *dcl = getPrimaryDecl(op); 2513 Expr::isLvalueResult lval = op->isLvalue(Context); 2514 2515 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2516 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2517 // FIXME: emit more specific diag... 2518 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 2519 op->getSourceRange()); 2520 return QualType(); 2521 } 2522 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2523 if (MemExpr->getMemberDecl()->isBitField()) { 2524 Diag(OpLoc, diag::err_typecheck_address_of, 2525 std::string("bit-field"), op->getSourceRange()); 2526 return QualType(); 2527 } 2528 // Check for Apple extension for accessing vector components. 2529 } else if (isa<ArraySubscriptExpr>(op) && 2530 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2531 Diag(OpLoc, diag::err_typecheck_address_of, 2532 std::string("vector"), op->getSourceRange()); 2533 return QualType(); 2534 } else if (dcl) { // C99 6.5.3.2p1 2535 // We have an lvalue with a decl. Make sure the decl is not declared 2536 // with the register storage-class specifier. 2537 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2538 if (vd->getStorageClass() == VarDecl::Register) { 2539 Diag(OpLoc, diag::err_typecheck_address_of, 2540 std::string("register variable"), op->getSourceRange()); 2541 return QualType(); 2542 } 2543 } else 2544 assert(0 && "Unknown/unexpected decl type"); 2545 } 2546 2547 // If the operand has type "type", the result has type "pointer to type". 2548 return Context.getPointerType(op->getType()); 2549} 2550 2551QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 2552 UsualUnaryConversions(op); 2553 QualType qType = op->getType(); 2554 2555 if (const PointerType *PT = qType->getAsPointerType()) { 2556 // Note that per both C89 and C99, this is always legal, even 2557 // if ptype is an incomplete type or void. 2558 // It would be possible to warn about dereferencing a 2559 // void pointer, but it's completely well-defined, 2560 // and such a warning is unlikely to catch any mistakes. 2561 return PT->getPointeeType(); 2562 } 2563 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 2564 qType.getAsString(), op->getSourceRange()); 2565 return QualType(); 2566} 2567 2568static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2569 tok::TokenKind Kind) { 2570 BinaryOperator::Opcode Opc; 2571 switch (Kind) { 2572 default: assert(0 && "Unknown binop!"); 2573 case tok::star: Opc = BinaryOperator::Mul; break; 2574 case tok::slash: Opc = BinaryOperator::Div; break; 2575 case tok::percent: Opc = BinaryOperator::Rem; break; 2576 case tok::plus: Opc = BinaryOperator::Add; break; 2577 case tok::minus: Opc = BinaryOperator::Sub; break; 2578 case tok::lessless: Opc = BinaryOperator::Shl; break; 2579 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2580 case tok::lessequal: Opc = BinaryOperator::LE; break; 2581 case tok::less: Opc = BinaryOperator::LT; break; 2582 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2583 case tok::greater: Opc = BinaryOperator::GT; break; 2584 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2585 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2586 case tok::amp: Opc = BinaryOperator::And; break; 2587 case tok::caret: Opc = BinaryOperator::Xor; break; 2588 case tok::pipe: Opc = BinaryOperator::Or; break; 2589 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2590 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2591 case tok::equal: Opc = BinaryOperator::Assign; break; 2592 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2593 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2594 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2595 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2596 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2597 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2598 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2599 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2600 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2601 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2602 case tok::comma: Opc = BinaryOperator::Comma; break; 2603 } 2604 return Opc; 2605} 2606 2607static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2608 tok::TokenKind Kind) { 2609 UnaryOperator::Opcode Opc; 2610 switch (Kind) { 2611 default: assert(0 && "Unknown unary op!"); 2612 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2613 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2614 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2615 case tok::star: Opc = UnaryOperator::Deref; break; 2616 case tok::plus: Opc = UnaryOperator::Plus; break; 2617 case tok::minus: Opc = UnaryOperator::Minus; break; 2618 case tok::tilde: Opc = UnaryOperator::Not; break; 2619 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2620 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 2621 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 2622 case tok::kw___real: Opc = UnaryOperator::Real; break; 2623 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2624 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2625 } 2626 return Opc; 2627} 2628 2629/// CreateBuiltinBinOp - Creates a new built-in binary operation with 2630/// operator @p Opc at location @c TokLoc. This routine only supports 2631/// built-in operations; ActOnBinOp handles overloaded operators. 2632Action::ExprResult Sema::CreateBuiltinBinOp(SourceLocation OpLoc, 2633 unsigned Op, 2634 Expr *lhs, Expr *rhs) { 2635 QualType ResultTy; // Result type of the binary operator. 2636 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2637 BinaryOperator::Opcode Opc = (BinaryOperator::Opcode)Op; 2638 2639 switch (Opc) { 2640 default: 2641 assert(0 && "Unknown binary expr!"); 2642 case BinaryOperator::Assign: 2643 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, QualType()); 2644 break; 2645 case BinaryOperator::Mul: 2646 case BinaryOperator::Div: 2647 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc); 2648 break; 2649 case BinaryOperator::Rem: 2650 ResultTy = CheckRemainderOperands(lhs, rhs, OpLoc); 2651 break; 2652 case BinaryOperator::Add: 2653 ResultTy = CheckAdditionOperands(lhs, rhs, OpLoc); 2654 break; 2655 case BinaryOperator::Sub: 2656 ResultTy = CheckSubtractionOperands(lhs, rhs, OpLoc); 2657 break; 2658 case BinaryOperator::Shl: 2659 case BinaryOperator::Shr: 2660 ResultTy = CheckShiftOperands(lhs, rhs, OpLoc); 2661 break; 2662 case BinaryOperator::LE: 2663 case BinaryOperator::LT: 2664 case BinaryOperator::GE: 2665 case BinaryOperator::GT: 2666 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, true); 2667 break; 2668 case BinaryOperator::EQ: 2669 case BinaryOperator::NE: 2670 ResultTy = CheckCompareOperands(lhs, rhs, OpLoc, false); 2671 break; 2672 case BinaryOperator::And: 2673 case BinaryOperator::Xor: 2674 case BinaryOperator::Or: 2675 ResultTy = CheckBitwiseOperands(lhs, rhs, OpLoc); 2676 break; 2677 case BinaryOperator::LAnd: 2678 case BinaryOperator::LOr: 2679 ResultTy = CheckLogicalOperands(lhs, rhs, OpLoc); 2680 break; 2681 case BinaryOperator::MulAssign: 2682 case BinaryOperator::DivAssign: 2683 CompTy = CheckMultiplyDivideOperands(lhs, rhs, OpLoc, true); 2684 if (!CompTy.isNull()) 2685 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2686 break; 2687 case BinaryOperator::RemAssign: 2688 CompTy = CheckRemainderOperands(lhs, rhs, OpLoc, true); 2689 if (!CompTy.isNull()) 2690 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2691 break; 2692 case BinaryOperator::AddAssign: 2693 CompTy = CheckAdditionOperands(lhs, rhs, OpLoc, true); 2694 if (!CompTy.isNull()) 2695 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2696 break; 2697 case BinaryOperator::SubAssign: 2698 CompTy = CheckSubtractionOperands(lhs, rhs, OpLoc, true); 2699 if (!CompTy.isNull()) 2700 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2701 break; 2702 case BinaryOperator::ShlAssign: 2703 case BinaryOperator::ShrAssign: 2704 CompTy = CheckShiftOperands(lhs, rhs, OpLoc, true); 2705 if (!CompTy.isNull()) 2706 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2707 break; 2708 case BinaryOperator::AndAssign: 2709 case BinaryOperator::XorAssign: 2710 case BinaryOperator::OrAssign: 2711 CompTy = CheckBitwiseOperands(lhs, rhs, OpLoc, true); 2712 if (!CompTy.isNull()) 2713 ResultTy = CheckAssignmentOperands(lhs, rhs, OpLoc, CompTy); 2714 break; 2715 case BinaryOperator::Comma: 2716 ResultTy = CheckCommaOperands(lhs, rhs, OpLoc); 2717 break; 2718 } 2719 if (ResultTy.isNull()) 2720 return true; 2721 if (CompTy.isNull()) 2722 return new BinaryOperator(lhs, rhs, Opc, ResultTy, OpLoc); 2723 else 2724 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, OpLoc); 2725} 2726 2727// Binary Operators. 'Tok' is the token for the operator. 2728Action::ExprResult Sema::ActOnBinOp(Scope *S, SourceLocation TokLoc, 2729 tok::TokenKind Kind, 2730 ExprTy *LHS, ExprTy *RHS) { 2731 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 2732 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 2733 2734 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 2735 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 2736 2737 if (getLangOptions().CPlusPlus && 2738 (lhs->getType()->isRecordType() || lhs->getType()->isEnumeralType() || 2739 rhs->getType()->isRecordType() || rhs->getType()->isEnumeralType())) { 2740 // C++ [over.binary]p1: 2741 // A binary operator shall be implemented either by a non-static 2742 // member function (9.3) with one parameter or by a non-member 2743 // function with two parameters. Thus, for any binary operator 2744 // @, x@y can be interpreted as either x.operator@(y) or 2745 // operator@(x,y). If both forms of the operator function have 2746 // been declared, the rules in 13.3.1.2 determines which, if 2747 // any, interpretation is used. 2748 OverloadCandidateSet CandidateSet; 2749 2750 // Determine which overloaded operator we're dealing with. 2751 static const OverloadedOperatorKind OverOps[] = { 2752 OO_Star, OO_Slash, OO_Percent, 2753 OO_Plus, OO_Minus, 2754 OO_LessLess, OO_GreaterGreater, 2755 OO_Less, OO_Greater, OO_LessEqual, OO_GreaterEqual, 2756 OO_EqualEqual, OO_ExclaimEqual, 2757 OO_Amp, 2758 OO_Caret, 2759 OO_Pipe, 2760 OO_AmpAmp, 2761 OO_PipePipe, 2762 OO_Equal, OO_StarEqual, 2763 OO_SlashEqual, OO_PercentEqual, 2764 OO_PlusEqual, OO_MinusEqual, 2765 OO_LessLessEqual, OO_GreaterGreaterEqual, 2766 OO_AmpEqual, OO_CaretEqual, 2767 OO_PipeEqual, 2768 OO_Comma 2769 }; 2770 OverloadedOperatorKind OverOp = OverOps[Opc]; 2771 2772 // Lookup this operator. 2773 Decl *D = LookupDecl(&PP.getIdentifierTable().getOverloadedOperator(OverOp), 2774 Decl::IDNS_Ordinary, S); 2775 2776 // Add any overloaded operators we find to the overload set. 2777 Expr *Args[2] = { lhs, rhs }; 2778 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) 2779 AddOverloadCandidate(FD, Args, 2, CandidateSet); 2780 else if (OverloadedFunctionDecl *Ovl 2781 = dyn_cast_or_null<OverloadedFunctionDecl>(D)) 2782 AddOverloadCandidates(Ovl, Args, 2, CandidateSet); 2783 2784 // FIXME: Add builtin overload candidates (C++ [over.built]). 2785 2786 // Perform overload resolution. 2787 OverloadCandidateSet::iterator Best; 2788 switch (BestViableFunction(CandidateSet, Best)) { 2789 case OR_Success: { 2790 // FIXME: We might find a built-in candidate here. 2791 FunctionDecl *FnDecl = Best->Function; 2792 2793 // Convert the arguments. 2794 // FIXME: Conversion will be different for member operators. 2795 if (PerformCopyInitialization(lhs, FnDecl->getParamDecl(0)->getType(), 2796 "passing") || 2797 PerformCopyInitialization(rhs, FnDecl->getParamDecl(1)->getType(), 2798 "passing")) 2799 return true; 2800 2801 // Determine the result type 2802 QualType ResultTy 2803 = FnDecl->getType()->getAsFunctionType()->getResultType(); 2804 ResultTy = ResultTy.getNonReferenceType(); 2805 2806 // Build the actual expression node. 2807 // FIXME: We lose the fact that we have a function here! 2808 if (Opc > BinaryOperator::Assign && Opc <= BinaryOperator::OrAssign) 2809 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, ResultTy, 2810 TokLoc); 2811 else 2812 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 2813 } 2814 2815 case OR_No_Viable_Function: 2816 // No viable function; fall through to handling this as a 2817 // built-in operator. 2818 break; 2819 2820 case OR_Ambiguous: 2821 Diag(TokLoc, 2822 diag::err_ovl_ambiguous_oper, 2823 BinaryOperator::getOpcodeStr(Opc), 2824 lhs->getSourceRange(), rhs->getSourceRange()); 2825 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 2826 return true; 2827 } 2828 2829 // There was no viable overloaded operator; fall through. 2830 } 2831 2832 2833 // Build a built-in binary operation. 2834 return CreateBuiltinBinOp(TokLoc, Opc, lhs, rhs); 2835} 2836 2837// Unary Operators. 'Tok' is the token for the operator. 2838Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2839 ExprTy *input) { 2840 Expr *Input = (Expr*)input; 2841 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2842 QualType resultType; 2843 switch (Opc) { 2844 default: 2845 assert(0 && "Unimplemented unary expr!"); 2846 case UnaryOperator::PreInc: 2847 case UnaryOperator::PreDec: 2848 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2849 break; 2850 case UnaryOperator::AddrOf: 2851 resultType = CheckAddressOfOperand(Input, OpLoc); 2852 break; 2853 case UnaryOperator::Deref: 2854 DefaultFunctionArrayConversion(Input); 2855 resultType = CheckIndirectionOperand(Input, OpLoc); 2856 break; 2857 case UnaryOperator::Plus: 2858 case UnaryOperator::Minus: 2859 UsualUnaryConversions(Input); 2860 resultType = Input->getType(); 2861 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2862 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2863 resultType.getAsString()); 2864 break; 2865 case UnaryOperator::Not: // bitwise complement 2866 UsualUnaryConversions(Input); 2867 resultType = Input->getType(); 2868 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 2869 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 2870 // C99 does not support '~' for complex conjugation. 2871 Diag(OpLoc, diag::ext_integer_complement_complex, 2872 resultType.getAsString(), Input->getSourceRange()); 2873 else if (!resultType->isIntegerType()) 2874 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2875 resultType.getAsString(), Input->getSourceRange()); 2876 break; 2877 case UnaryOperator::LNot: // logical negation 2878 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2879 DefaultFunctionArrayConversion(Input); 2880 resultType = Input->getType(); 2881 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2882 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2883 resultType.getAsString()); 2884 // LNot always has type int. C99 6.5.3.3p5. 2885 resultType = Context.IntTy; 2886 break; 2887 case UnaryOperator::SizeOf: 2888 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2889 Input->getSourceRange(), true); 2890 break; 2891 case UnaryOperator::AlignOf: 2892 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2893 Input->getSourceRange(), false); 2894 break; 2895 case UnaryOperator::Real: 2896 case UnaryOperator::Imag: 2897 resultType = CheckRealImagOperand(Input, OpLoc); 2898 break; 2899 case UnaryOperator::Extension: 2900 resultType = Input->getType(); 2901 break; 2902 } 2903 if (resultType.isNull()) 2904 return true; 2905 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2906} 2907 2908/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2909Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2910 SourceLocation LabLoc, 2911 IdentifierInfo *LabelII) { 2912 // Look up the record for this label identifier. 2913 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2914 2915 // If we haven't seen this label yet, create a forward reference. It 2916 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 2917 if (LabelDecl == 0) 2918 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2919 2920 // Create the AST node. The address of a label always has type 'void*'. 2921 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2922 Context.getPointerType(Context.VoidTy)); 2923} 2924 2925Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2926 SourceLocation RPLoc) { // "({..})" 2927 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2928 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2929 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2930 2931 // FIXME: there are a variety of strange constraints to enforce here, for 2932 // example, it is not possible to goto into a stmt expression apparently. 2933 // More semantic analysis is needed. 2934 2935 // FIXME: the last statement in the compount stmt has its value used. We 2936 // should not warn about it being unused. 2937 2938 // If there are sub stmts in the compound stmt, take the type of the last one 2939 // as the type of the stmtexpr. 2940 QualType Ty = Context.VoidTy; 2941 2942 if (!Compound->body_empty()) { 2943 Stmt *LastStmt = Compound->body_back(); 2944 // If LastStmt is a label, skip down through into the body. 2945 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 2946 LastStmt = Label->getSubStmt(); 2947 2948 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 2949 Ty = LastExpr->getType(); 2950 } 2951 2952 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2953} 2954 2955Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2956 SourceLocation TypeLoc, 2957 TypeTy *argty, 2958 OffsetOfComponent *CompPtr, 2959 unsigned NumComponents, 2960 SourceLocation RPLoc) { 2961 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2962 assert(!ArgTy.isNull() && "Missing type argument!"); 2963 2964 // We must have at least one component that refers to the type, and the first 2965 // one is known to be a field designator. Verify that the ArgTy represents 2966 // a struct/union/class. 2967 if (!ArgTy->isRecordType()) 2968 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2969 2970 // Otherwise, create a compound literal expression as the base, and 2971 // iteratively process the offsetof designators. 2972 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2973 2974 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2975 // GCC extension, diagnose them. 2976 if (NumComponents != 1) 2977 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2978 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2979 2980 for (unsigned i = 0; i != NumComponents; ++i) { 2981 const OffsetOfComponent &OC = CompPtr[i]; 2982 if (OC.isBrackets) { 2983 // Offset of an array sub-field. TODO: Should we allow vector elements? 2984 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 2985 if (!AT) { 2986 delete Res; 2987 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 2988 Res->getType().getAsString()); 2989 } 2990 2991 // FIXME: C++: Verify that operator[] isn't overloaded. 2992 2993 // C99 6.5.2.1p1 2994 Expr *Idx = static_cast<Expr*>(OC.U.E); 2995 if (!Idx->getType()->isIntegerType()) 2996 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 2997 Idx->getSourceRange()); 2998 2999 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 3000 continue; 3001 } 3002 3003 const RecordType *RC = Res->getType()->getAsRecordType(); 3004 if (!RC) { 3005 delete Res; 3006 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 3007 Res->getType().getAsString()); 3008 } 3009 3010 // Get the decl corresponding to this. 3011 RecordDecl *RD = RC->getDecl(); 3012 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 3013 if (!MemberDecl) 3014 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 3015 OC.U.IdentInfo->getName(), 3016 SourceRange(OC.LocStart, OC.LocEnd)); 3017 3018 // FIXME: C++: Verify that MemberDecl isn't a static field. 3019 // FIXME: Verify that MemberDecl isn't a bitfield. 3020 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 3021 // matter here. 3022 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, 3023 MemberDecl->getType().getNonReferenceType()); 3024 } 3025 3026 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 3027 BuiltinLoc); 3028} 3029 3030 3031Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 3032 TypeTy *arg1, TypeTy *arg2, 3033 SourceLocation RPLoc) { 3034 QualType argT1 = QualType::getFromOpaquePtr(arg1); 3035 QualType argT2 = QualType::getFromOpaquePtr(arg2); 3036 3037 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 3038 3039 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 3040} 3041 3042Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 3043 ExprTy *expr1, ExprTy *expr2, 3044 SourceLocation RPLoc) { 3045 Expr *CondExpr = static_cast<Expr*>(cond); 3046 Expr *LHSExpr = static_cast<Expr*>(expr1); 3047 Expr *RHSExpr = static_cast<Expr*>(expr2); 3048 3049 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 3050 3051 // The conditional expression is required to be a constant expression. 3052 llvm::APSInt condEval(32); 3053 SourceLocation ExpLoc; 3054 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 3055 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 3056 CondExpr->getSourceRange()); 3057 3058 // If the condition is > zero, then the AST type is the same as the LSHExpr. 3059 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 3060 RHSExpr->getType(); 3061 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 3062} 3063 3064//===----------------------------------------------------------------------===// 3065// Clang Extensions. 3066//===----------------------------------------------------------------------===// 3067 3068/// ActOnBlockStart - This callback is invoked when a block literal is started. 3069void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 3070 // Analyze block parameters. 3071 BlockSemaInfo *BSI = new BlockSemaInfo(); 3072 3073 // Add BSI to CurBlock. 3074 BSI->PrevBlockInfo = CurBlock; 3075 CurBlock = BSI; 3076 3077 BSI->ReturnType = 0; 3078 BSI->TheScope = BlockScope; 3079 3080 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 3081 PushDeclContext(BSI->TheDecl); 3082} 3083 3084void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 3085 // Analyze arguments to block. 3086 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 3087 "Not a function declarator!"); 3088 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 3089 3090 CurBlock->hasPrototype = FTI.hasPrototype; 3091 CurBlock->isVariadic = true; 3092 3093 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 3094 // no arguments, not a function that takes a single void argument. 3095 if (FTI.hasPrototype && 3096 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3097 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 3098 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 3099 // empty arg list, don't push any params. 3100 CurBlock->isVariadic = false; 3101 } else if (FTI.hasPrototype) { 3102 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 3103 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 3104 CurBlock->isVariadic = FTI.isVariadic; 3105 } 3106 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 3107 3108 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 3109 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 3110 // If this has an identifier, add it to the scope stack. 3111 if ((*AI)->getIdentifier()) 3112 PushOnScopeChains(*AI, CurBlock->TheScope); 3113} 3114 3115/// ActOnBlockError - If there is an error parsing a block, this callback 3116/// is invoked to pop the information about the block from the action impl. 3117void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 3118 // Ensure that CurBlock is deleted. 3119 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 3120 3121 // Pop off CurBlock, handle nested blocks. 3122 CurBlock = CurBlock->PrevBlockInfo; 3123 3124 // FIXME: Delete the ParmVarDecl objects as well??? 3125 3126} 3127 3128/// ActOnBlockStmtExpr - This is called when the body of a block statement 3129/// literal was successfully completed. ^(int x){...} 3130Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 3131 Scope *CurScope) { 3132 // Ensure that CurBlock is deleted. 3133 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 3134 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 3135 3136 PopDeclContext(); 3137 3138 // Pop off CurBlock, handle nested blocks. 3139 CurBlock = CurBlock->PrevBlockInfo; 3140 3141 QualType RetTy = Context.VoidTy; 3142 if (BSI->ReturnType) 3143 RetTy = QualType(BSI->ReturnType, 0); 3144 3145 llvm::SmallVector<QualType, 8> ArgTypes; 3146 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 3147 ArgTypes.push_back(BSI->Params[i]->getType()); 3148 3149 QualType BlockTy; 3150 if (!BSI->hasPrototype) 3151 BlockTy = Context.getFunctionTypeNoProto(RetTy); 3152 else 3153 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 3154 BSI->isVariadic, 0); 3155 3156 BlockTy = Context.getBlockPointerType(BlockTy); 3157 3158 BSI->TheDecl->setBody(Body.take()); 3159 return new BlockExpr(BSI->TheDecl, BlockTy); 3160} 3161 3162/// ExprsMatchFnType - return true if the Exprs in array Args have 3163/// QualTypes that match the QualTypes of the arguments of the FnType. 3164/// The number of arguments has already been validated to match the number of 3165/// arguments in FnType. 3166static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 3167 ASTContext &Context) { 3168 unsigned NumParams = FnType->getNumArgs(); 3169 for (unsigned i = 0; i != NumParams; ++i) { 3170 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 3171 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 3172 3173 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 3174 return false; 3175 } 3176 return true; 3177} 3178 3179Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 3180 SourceLocation *CommaLocs, 3181 SourceLocation BuiltinLoc, 3182 SourceLocation RParenLoc) { 3183 // __builtin_overload requires at least 2 arguments 3184 if (NumArgs < 2) 3185 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3186 SourceRange(BuiltinLoc, RParenLoc)); 3187 3188 // The first argument is required to be a constant expression. It tells us 3189 // the number of arguments to pass to each of the functions to be overloaded. 3190 Expr **Args = reinterpret_cast<Expr**>(args); 3191 Expr *NParamsExpr = Args[0]; 3192 llvm::APSInt constEval(32); 3193 SourceLocation ExpLoc; 3194 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 3195 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3196 NParamsExpr->getSourceRange()); 3197 3198 // Verify that the number of parameters is > 0 3199 unsigned NumParams = constEval.getZExtValue(); 3200 if (NumParams == 0) 3201 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3202 NParamsExpr->getSourceRange()); 3203 // Verify that we have at least 1 + NumParams arguments to the builtin. 3204 if ((NumParams + 1) > NumArgs) 3205 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3206 SourceRange(BuiltinLoc, RParenLoc)); 3207 3208 // Figure out the return type, by matching the args to one of the functions 3209 // listed after the parameters. 3210 OverloadExpr *OE = 0; 3211 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 3212 // UsualUnaryConversions will convert the function DeclRefExpr into a 3213 // pointer to function. 3214 Expr *Fn = UsualUnaryConversions(Args[i]); 3215 const FunctionTypeProto *FnType = 0; 3216 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3217 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3218 3219 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3220 // parameters, and the number of parameters must match the value passed to 3221 // the builtin. 3222 if (!FnType || (FnType->getNumArgs() != NumParams)) 3223 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 3224 Fn->getSourceRange()); 3225 3226 // Scan the parameter list for the FunctionType, checking the QualType of 3227 // each parameter against the QualTypes of the arguments to the builtin. 3228 // If they match, return a new OverloadExpr. 3229 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3230 if (OE) 3231 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 3232 OE->getFn()->getSourceRange()); 3233 // Remember our match, and continue processing the remaining arguments 3234 // to catch any errors. 3235 OE = new OverloadExpr(Args, NumArgs, i, 3236 FnType->getResultType().getNonReferenceType(), 3237 BuiltinLoc, RParenLoc); 3238 } 3239 } 3240 // Return the newly created OverloadExpr node, if we succeded in matching 3241 // exactly one of the candidate functions. 3242 if (OE) 3243 return OE; 3244 3245 // If we didn't find a matching function Expr in the __builtin_overload list 3246 // the return an error. 3247 std::string typeNames; 3248 for (unsigned i = 0; i != NumParams; ++i) { 3249 if (i != 0) typeNames += ", "; 3250 typeNames += Args[i+1]->getType().getAsString(); 3251 } 3252 3253 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 3254 SourceRange(BuiltinLoc, RParenLoc)); 3255} 3256 3257Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3258 ExprTy *expr, TypeTy *type, 3259 SourceLocation RPLoc) { 3260 Expr *E = static_cast<Expr*>(expr); 3261 QualType T = QualType::getFromOpaquePtr(type); 3262 3263 InitBuiltinVaListType(); 3264 3265 // Get the va_list type 3266 QualType VaListType = Context.getBuiltinVaListType(); 3267 // Deal with implicit array decay; for example, on x86-64, 3268 // va_list is an array, but it's supposed to decay to 3269 // a pointer for va_arg. 3270 if (VaListType->isArrayType()) 3271 VaListType = Context.getArrayDecayedType(VaListType); 3272 // Make sure the input expression also decays appropriately. 3273 UsualUnaryConversions(E); 3274 3275 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3276 return Diag(E->getLocStart(), 3277 diag::err_first_argument_to_va_arg_not_of_type_va_list, 3278 E->getType().getAsString(), 3279 E->getSourceRange()); 3280 3281 // FIXME: Warn if a non-POD type is passed in. 3282 3283 return new VAArgExpr(BuiltinLoc, E, T.getNonReferenceType(), RPLoc); 3284} 3285 3286bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3287 SourceLocation Loc, 3288 QualType DstType, QualType SrcType, 3289 Expr *SrcExpr, const char *Flavor) { 3290 // Decode the result (notice that AST's are still created for extensions). 3291 bool isInvalid = false; 3292 unsigned DiagKind; 3293 switch (ConvTy) { 3294 default: assert(0 && "Unknown conversion type"); 3295 case Compatible: return false; 3296 case PointerToInt: 3297 DiagKind = diag::ext_typecheck_convert_pointer_int; 3298 break; 3299 case IntToPointer: 3300 DiagKind = diag::ext_typecheck_convert_int_pointer; 3301 break; 3302 case IncompatiblePointer: 3303 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3304 break; 3305 case FunctionVoidPointer: 3306 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3307 break; 3308 case CompatiblePointerDiscardsQualifiers: 3309 // If the qualifiers lost were because we were applying the 3310 // (deprecated) C++ conversion from a string literal to a char* 3311 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3312 // Ideally, this check would be performed in 3313 // CheckPointerTypesForAssignment. However, that would require a 3314 // bit of refactoring (so that the second argument is an 3315 // expression, rather than a type), which should be done as part 3316 // of a larger effort to fix CheckPointerTypesForAssignment for 3317 // C++ semantics. 3318 if (getLangOptions().CPlusPlus && 3319 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3320 return false; 3321 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3322 break; 3323 case IntToBlockPointer: 3324 DiagKind = diag::err_int_to_block_pointer; 3325 break; 3326 case IncompatibleBlockPointer: 3327 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3328 break; 3329 case BlockVoidPointer: 3330 DiagKind = diag::ext_typecheck_convert_pointer_void_block; 3331 break; 3332 case IncompatibleObjCQualifiedId: 3333 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3334 // it can give a more specific diagnostic. 3335 DiagKind = diag::warn_incompatible_qualified_id; 3336 break; 3337 case Incompatible: 3338 DiagKind = diag::err_typecheck_convert_incompatible; 3339 isInvalid = true; 3340 break; 3341 } 3342 3343 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 3344 SrcExpr->getSourceRange()); 3345 return isInvalid; 3346} 3347