SemaExpr.cpp revision 49badde06e066d058d6c7fcf4e628a72999b65a9
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 (const ReferenceType *ref = Ty->getAsReferenceType()) { 39 ImpCastExprToType(E, ref->getPointeeType()); // C++ [expr] 40 Ty = E->getType(); 41 } 42 if (Ty->isFunctionType()) 43 ImpCastExprToType(E, Context.getPointerType(Ty)); 44 else if (Ty->isArrayType()) { 45 // In C90 mode, arrays only promote to pointers if the array expression is 46 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 47 // type 'array of type' is converted to an expression that has type 'pointer 48 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 49 // that has type 'array of type' ...". The relevant change is "an lvalue" 50 // (C90) to "an expression" (C99). 51 // 52 // C++ 4.2p1: 53 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 54 // T" can be converted to an rvalue of type "pointer to T". 55 // 56 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 57 E->isLvalue(Context) == Expr::LV_Valid) 58 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 59 } 60} 61 62/// UsualUnaryConversions - Performs various conversions that are common to most 63/// operators (C99 6.3). The conversions of array and function types are 64/// sometimes surpressed. For example, the array->pointer conversion doesn't 65/// apply if the array is an argument to the sizeof or address (&) operators. 66/// In these instances, this routine should *not* be called. 67Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 68 QualType Ty = Expr->getType(); 69 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 70 71 if (const ReferenceType *Ref = Ty->getAsReferenceType()) { 72 ImpCastExprToType(Expr, Ref->getPointeeType()); // C++ [expr] 73 Ty = Expr->getType(); 74 } 75 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 76 ImpCastExprToType(Expr, Context.IntTy); 77 else 78 DefaultFunctionArrayConversion(Expr); 79 80 return Expr; 81} 82 83/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 84/// do not have a prototype. Arguments that have type float are promoted to 85/// double. All other argument types are converted by UsualUnaryConversions(). 86void Sema::DefaultArgumentPromotion(Expr *&Expr) { 87 QualType Ty = Expr->getType(); 88 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 89 90 // If this is a 'float' (CVR qualified or typedef) promote to double. 91 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 92 if (BT->getKind() == BuiltinType::Float) 93 return ImpCastExprToType(Expr, Context.DoubleTy); 94 95 UsualUnaryConversions(Expr); 96} 97 98/// UsualArithmeticConversions - Performs various conversions that are common to 99/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 100/// routine returns the first non-arithmetic type found. The client is 101/// responsible for emitting appropriate error diagnostics. 102/// FIXME: verify the conversion rules for "complex int" are consistent with 103/// GCC. 104QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 105 bool isCompAssign) { 106 if (!isCompAssign) { 107 UsualUnaryConversions(lhsExpr); 108 UsualUnaryConversions(rhsExpr); 109 } 110 // For conversion purposes, we ignore any qualifiers. 111 // For example, "const float" and "float" are equivalent. 112 QualType lhs = 113 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 114 QualType rhs = 115 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 116 117 // If both types are identical, no conversion is needed. 118 if (lhs == rhs) 119 return lhs; 120 121 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 122 // The caller can deal with this (e.g. pointer + int). 123 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 124 return lhs; 125 126 // At this point, we have two different arithmetic types. 127 128 // Handle complex types first (C99 6.3.1.8p1). 129 if (lhs->isComplexType() || rhs->isComplexType()) { 130 // if we have an integer operand, the result is the complex type. 131 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 132 // convert the rhs to the lhs complex type. 133 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 134 return lhs; 135 } 136 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 137 // convert the lhs to the rhs complex type. 138 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 139 return rhs; 140 } 141 // This handles complex/complex, complex/float, or float/complex. 142 // When both operands are complex, the shorter operand is converted to the 143 // type of the longer, and that is the type of the result. This corresponds 144 // to what is done when combining two real floating-point operands. 145 // The fun begins when size promotion occur across type domains. 146 // From H&S 6.3.4: When one operand is complex and the other is a real 147 // floating-point type, the less precise type is converted, within it's 148 // real or complex domain, to the precision of the other type. For example, 149 // when combining a "long double" with a "double _Complex", the 150 // "double _Complex" is promoted to "long double _Complex". 151 int result = Context.getFloatingTypeOrder(lhs, rhs); 152 153 if (result > 0) { // The left side is bigger, convert rhs. 154 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 155 if (!isCompAssign) 156 ImpCastExprToType(rhsExpr, rhs); 157 } else if (result < 0) { // The right side is bigger, convert lhs. 158 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 159 if (!isCompAssign) 160 ImpCastExprToType(lhsExpr, lhs); 161 } 162 // At this point, lhs and rhs have the same rank/size. Now, make sure the 163 // domains match. This is a requirement for our implementation, C99 164 // does not require this promotion. 165 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 166 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 167 if (!isCompAssign) 168 ImpCastExprToType(lhsExpr, rhs); 169 return rhs; 170 } else { // handle "_Complex double, double". 171 if (!isCompAssign) 172 ImpCastExprToType(rhsExpr, lhs); 173 return lhs; 174 } 175 } 176 return lhs; // The domain/size match exactly. 177 } 178 // Now handle "real" floating types (i.e. float, double, long double). 179 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 180 // if we have an integer operand, the result is the real floating type. 181 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 182 // convert rhs to the lhs floating point type. 183 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 184 return lhs; 185 } 186 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 187 // convert lhs to the rhs floating point type. 188 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 189 return rhs; 190 } 191 // We have two real floating types, float/complex combos were handled above. 192 // Convert the smaller operand to the bigger result. 193 int result = Context.getFloatingTypeOrder(lhs, rhs); 194 195 if (result > 0) { // convert the rhs 196 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 197 return lhs; 198 } 199 if (result < 0) { // convert the lhs 200 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 201 return rhs; 202 } 203 assert(0 && "Sema::UsualArithmeticConversions(): illegal float comparison"); 204 } 205 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 206 // Handle GCC complex int extension. 207 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 208 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 209 210 if (lhsComplexInt && rhsComplexInt) { 211 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 212 rhsComplexInt->getElementType()) >= 0) { 213 // convert the rhs 214 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 215 return lhs; 216 } 217 if (!isCompAssign) 218 ImpCastExprToType(lhsExpr, rhs); // convert the lhs 219 return rhs; 220 } else if (lhsComplexInt && rhs->isIntegerType()) { 221 // convert the rhs to the lhs complex type. 222 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 223 return lhs; 224 } else if (rhsComplexInt && lhs->isIntegerType()) { 225 // convert the lhs to the rhs complex type. 226 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 227 return rhs; 228 } 229 } 230 // Finally, we have two differing integer types. 231 // The rules for this case are in C99 6.3.1.8 232 int compare = Context.getIntegerTypeOrder(lhs, rhs); 233 bool lhsSigned = lhs->isSignedIntegerType(), 234 rhsSigned = rhs->isSignedIntegerType(); 235 QualType destType; 236 if (lhsSigned == rhsSigned) { 237 // Same signedness; use the higher-ranked type 238 destType = compare >= 0 ? lhs : rhs; 239 } else if (compare != (lhsSigned ? 1 : -1)) { 240 // The unsigned type has greater than or equal rank to the 241 // signed type, so use the unsigned type 242 destType = lhsSigned ? rhs : lhs; 243 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 244 // The two types are different widths; if we are here, that 245 // means the signed type is larger than the unsigned type, so 246 // use the signed type. 247 destType = lhsSigned ? lhs : rhs; 248 } else { 249 // The signed type is higher-ranked than the unsigned type, 250 // but isn't actually any bigger (like unsigned int and long 251 // on most 32-bit systems). Use the unsigned type corresponding 252 // to the signed type. 253 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 254 } 255 if (!isCompAssign) { 256 ImpCastExprToType(lhsExpr, destType); 257 ImpCastExprToType(rhsExpr, destType); 258 } 259 return destType; 260} 261 262//===----------------------------------------------------------------------===// 263// Semantic Analysis for various Expression Types 264//===----------------------------------------------------------------------===// 265 266 267/// ActOnStringLiteral - The specified tokens were lexed as pasted string 268/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 269/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 270/// multiple tokens. However, the common case is that StringToks points to one 271/// string. 272/// 273Action::ExprResult 274Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 275 assert(NumStringToks && "Must have at least one string!"); 276 277 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 278 if (Literal.hadError) 279 return ExprResult(true); 280 281 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 282 for (unsigned i = 0; i != NumStringToks; ++i) 283 StringTokLocs.push_back(StringToks[i].getLocation()); 284 285 // Verify that pascal strings aren't too large. 286 if (Literal.Pascal && Literal.GetStringLength() > 256) 287 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long, 288 SourceRange(StringToks[0].getLocation(), 289 StringToks[NumStringToks-1].getLocation())); 290 291 QualType StrTy = Context.CharTy; 292 if (Literal.AnyWide) StrTy = Context.getWCharType(); 293 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 294 295 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 296 if (getLangOptions().CPlusPlus) 297 StrTy.addConst(); 298 299 // Get an array type for the string, according to C99 6.4.5. This includes 300 // the nul terminator character as well as the string length for pascal 301 // strings. 302 StrTy = Context.getConstantArrayType(StrTy, 303 llvm::APInt(32, Literal.GetStringLength()+1), 304 ArrayType::Normal, 0); 305 306 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 307 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 308 Literal.AnyWide, StrTy, 309 StringToks[0].getLocation(), 310 StringToks[NumStringToks-1].getLocation()); 311} 312 313/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 314/// CurBlock to VD should cause it to be snapshotted (as we do for auto 315/// variables defined outside the block) or false if this is not needed (e.g. 316/// for values inside the block or for globals). 317/// 318/// FIXME: This will create BlockDeclRefExprs for global variables, 319/// function references, etc which is suboptimal :) and breaks 320/// things like "integer constant expression" tests. 321static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 322 ValueDecl *VD) { 323 // If the value is defined inside the block, we couldn't snapshot it even if 324 // we wanted to. 325 if (CurBlock->TheDecl == VD->getDeclContext()) 326 return false; 327 328 // If this is an enum constant or function, it is constant, don't snapshot. 329 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 330 return false; 331 332 // If this is a reference to an extern, static, or global variable, no need to 333 // snapshot it. 334 // FIXME: What about 'const' variables in C++? 335 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 336 return Var->hasLocalStorage(); 337 338 return true; 339} 340 341 342 343/// ActOnIdentifierExpr - The parser read an identifier in expression context, 344/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 345/// identifier is used in a function call context. 346Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 347 IdentifierInfo &II, 348 bool HasTrailingLParen) { 349 // Could be enum-constant, value decl, instance variable, etc. 350 Decl *D = LookupDecl(&II, Decl::IDNS_Ordinary, S); 351 352 // If this reference is in an Objective-C method, then ivar lookup happens as 353 // well. 354 if (getCurMethodDecl()) { 355 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 356 // There are two cases to handle here. 1) scoped lookup could have failed, 357 // in which case we should look for an ivar. 2) scoped lookup could have 358 // found a decl, but that decl is outside the current method (i.e. a global 359 // variable). In these two cases, we do a lookup for an ivar with this 360 // name, if the lookup suceeds, we replace it our current decl. 361 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 362 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 363 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&II)) { 364 // FIXME: This should use a new expr for a direct reference, don't turn 365 // this into Self->ivar, just return a BareIVarExpr or something. 366 IdentifierInfo &II = Context.Idents.get("self"); 367 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 368 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 369 static_cast<Expr*>(SelfExpr.Val), true, true); 370 } 371 } 372 // Needed to implement property "super.method" notation. 373 if (SD == 0 && &II == SuperID) { 374 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 375 getCurMethodDecl()->getClassInterface())); 376 return new PredefinedExpr(Loc, T, PredefinedExpr::ObjCSuper); 377 } 378 } 379 if (D == 0) { 380 // Otherwise, this could be an implicitly declared function reference (legal 381 // in C90, extension in C99). 382 if (HasTrailingLParen && 383 !getLangOptions().CPlusPlus) // Not in C++. 384 D = ImplicitlyDefineFunction(Loc, II, S); 385 else { 386 // If this name wasn't predeclared and if this is not a function call, 387 // diagnose the problem. 388 return Diag(Loc, diag::err_undeclared_var_use, II.getName()); 389 } 390 } 391 392 if (CXXFieldDecl *FD = dyn_cast<CXXFieldDecl>(D)) { 393 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 394 if (MD->isStatic()) 395 // "invalid use of member 'x' in static member function" 396 return Diag(Loc, diag::err_invalid_member_use_in_static_method, 397 FD->getName()); 398 if (cast<CXXRecordDecl>(MD->getParent()) != FD->getParent()) 399 // "invalid use of nonstatic data member 'x'" 400 return Diag(Loc, diag::err_invalid_non_static_member_use, 401 FD->getName()); 402 403 if (FD->isInvalidDecl()) 404 return true; 405 406 // FIXME: Handle 'mutable'. 407 return new DeclRefExpr(FD, 408 FD->getType().getWithAdditionalQualifiers(MD->getTypeQualifiers()),Loc); 409 } 410 411 return Diag(Loc, diag::err_invalid_non_static_member_use, FD->getName()); 412 } 413 if (isa<TypedefDecl>(D)) 414 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 415 if (isa<ObjCInterfaceDecl>(D)) 416 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 417 if (isa<NamespaceDecl>(D)) 418 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 419 420 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 421 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 422 return new DeclRefExpr(Ovl, Context.OverloadTy, Loc); 423 424 ValueDecl *VD = cast<ValueDecl>(D); 425 426 // check if referencing an identifier with __attribute__((deprecated)). 427 if (VD->getAttr<DeprecatedAttr>()) 428 Diag(Loc, diag::warn_deprecated, VD->getName()); 429 430 // Only create DeclRefExpr's for valid Decl's. 431 if (VD->isInvalidDecl()) 432 return true; 433 434 // If the identifier reference is inside a block, and it refers to a value 435 // that is outside the block, create a BlockDeclRefExpr instead of a 436 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 437 // the block is formed. 438 // 439 // We do not do this for things like enum constants, global variables, etc, 440 // as they do not get snapshotted. 441 // 442 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 443 // The BlocksAttr indicates the variable is bound by-reference. 444 if (VD->getAttr<BlocksAttr>()) 445 return new BlockDeclRefExpr(VD, VD->getType(), Loc, true); 446 447 // Variable will be bound by-copy, make it const within the closure. 448 VD->getType().addConst(); 449 return new BlockDeclRefExpr(VD, VD->getType(), Loc, false); 450 } 451 // If this reference is not in a block or if the referenced variable is 452 // within the block, create a normal DeclRefExpr. 453 return new DeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc); 454} 455 456Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 457 tok::TokenKind Kind) { 458 PredefinedExpr::IdentType IT; 459 460 switch (Kind) { 461 default: assert(0 && "Unknown simple primary expr!"); 462 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 463 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 464 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 465 } 466 467 // Verify that this is in a function context. 468 if (getCurFunctionDecl() == 0 && getCurMethodDecl() == 0) 469 return Diag(Loc, diag::err_predef_outside_function); 470 471 // Pre-defined identifiers are of type char[x], where x is the length of the 472 // string. 473 unsigned Length; 474 if (getCurFunctionDecl()) 475 Length = getCurFunctionDecl()->getIdentifier()->getLength(); 476 else 477 Length = getCurMethodDecl()->getSynthesizedMethodSize(); 478 479 llvm::APInt LengthI(32, Length + 1); 480 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 481 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 482 return new PredefinedExpr(Loc, ResTy, IT); 483} 484 485Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 486 llvm::SmallString<16> CharBuffer; 487 CharBuffer.resize(Tok.getLength()); 488 const char *ThisTokBegin = &CharBuffer[0]; 489 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 490 491 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 492 Tok.getLocation(), PP); 493 if (Literal.hadError()) 494 return ExprResult(true); 495 496 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 497 498 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 499 Tok.getLocation()); 500} 501 502Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 503 // fast path for a single digit (which is quite common). A single digit 504 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 505 if (Tok.getLength() == 1) { 506 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 507 508 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 509 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 510 Context.IntTy, 511 Tok.getLocation())); 512 } 513 llvm::SmallString<512> IntegerBuffer; 514 // Add padding so that NumericLiteralParser can overread by one character. 515 IntegerBuffer.resize(Tok.getLength()+1); 516 const char *ThisTokBegin = &IntegerBuffer[0]; 517 518 // Get the spelling of the token, which eliminates trigraphs, etc. 519 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 520 521 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 522 Tok.getLocation(), PP); 523 if (Literal.hadError) 524 return ExprResult(true); 525 526 Expr *Res; 527 528 if (Literal.isFloatingLiteral()) { 529 QualType Ty; 530 if (Literal.isFloat) 531 Ty = Context.FloatTy; 532 else if (!Literal.isLong) 533 Ty = Context.DoubleTy; 534 else 535 Ty = Context.LongDoubleTy; 536 537 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 538 539 // isExact will be set by GetFloatValue(). 540 bool isExact = false; 541 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 542 Ty, Tok.getLocation()); 543 544 } else if (!Literal.isIntegerLiteral()) { 545 return ExprResult(true); 546 } else { 547 QualType Ty; 548 549 // long long is a C99 feature. 550 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 551 Literal.isLongLong) 552 Diag(Tok.getLocation(), diag::ext_longlong); 553 554 // Get the value in the widest-possible width. 555 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 556 557 if (Literal.GetIntegerValue(ResultVal)) { 558 // If this value didn't fit into uintmax_t, warn and force to ull. 559 Diag(Tok.getLocation(), diag::warn_integer_too_large); 560 Ty = Context.UnsignedLongLongTy; 561 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 562 "long long is not intmax_t?"); 563 } else { 564 // If this value fits into a ULL, try to figure out what else it fits into 565 // according to the rules of C99 6.4.4.1p5. 566 567 // Octal, Hexadecimal, and integers with a U suffix are allowed to 568 // be an unsigned int. 569 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 570 571 // Check from smallest to largest, picking the smallest type we can. 572 unsigned Width = 0; 573 if (!Literal.isLong && !Literal.isLongLong) { 574 // Are int/unsigned possibilities? 575 unsigned IntSize = Context.Target.getIntWidth(); 576 577 // Does it fit in a unsigned int? 578 if (ResultVal.isIntN(IntSize)) { 579 // Does it fit in a signed int? 580 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 581 Ty = Context.IntTy; 582 else if (AllowUnsigned) 583 Ty = Context.UnsignedIntTy; 584 Width = IntSize; 585 } 586 } 587 588 // Are long/unsigned long possibilities? 589 if (Ty.isNull() && !Literal.isLongLong) { 590 unsigned LongSize = Context.Target.getLongWidth(); 591 592 // Does it fit in a unsigned long? 593 if (ResultVal.isIntN(LongSize)) { 594 // Does it fit in a signed long? 595 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 596 Ty = Context.LongTy; 597 else if (AllowUnsigned) 598 Ty = Context.UnsignedLongTy; 599 Width = LongSize; 600 } 601 } 602 603 // Finally, check long long if needed. 604 if (Ty.isNull()) { 605 unsigned LongLongSize = Context.Target.getLongLongWidth(); 606 607 // Does it fit in a unsigned long long? 608 if (ResultVal.isIntN(LongLongSize)) { 609 // Does it fit in a signed long long? 610 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 611 Ty = Context.LongLongTy; 612 else if (AllowUnsigned) 613 Ty = Context.UnsignedLongLongTy; 614 Width = LongLongSize; 615 } 616 } 617 618 // If we still couldn't decide a type, we probably have something that 619 // does not fit in a signed long long, but has no U suffix. 620 if (Ty.isNull()) { 621 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 622 Ty = Context.UnsignedLongLongTy; 623 Width = Context.Target.getLongLongWidth(); 624 } 625 626 if (ResultVal.getBitWidth() != Width) 627 ResultVal.trunc(Width); 628 } 629 630 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 631 } 632 633 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 634 if (Literal.isImaginary) 635 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 636 637 return Res; 638} 639 640Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 641 ExprTy *Val) { 642 Expr *E = (Expr *)Val; 643 assert((E != 0) && "ActOnParenExpr() missing expr"); 644 return new ParenExpr(L, R, E); 645} 646 647/// The UsualUnaryConversions() function is *not* called by this routine. 648/// See C99 6.3.2.1p[2-4] for more details. 649QualType Sema::CheckSizeOfAlignOfOperand(QualType exprType, 650 SourceLocation OpLoc, 651 const SourceRange &ExprRange, 652 bool isSizeof) { 653 // C99 6.5.3.4p1: 654 if (isa<FunctionType>(exprType) && isSizeof) 655 // alignof(function) is allowed. 656 Diag(OpLoc, diag::ext_sizeof_function_type, ExprRange); 657 else if (exprType->isVoidType()) 658 Diag(OpLoc, diag::ext_sizeof_void_type, isSizeof ? "sizeof" : "__alignof", 659 ExprRange); 660 else if (exprType->isIncompleteType()) { 661 Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 662 diag::err_alignof_incomplete_type, 663 exprType.getAsString(), ExprRange); 664 return QualType(); // error 665 } 666 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 667 return Context.getSizeType(); 668} 669 670Action::ExprResult Sema:: 671ActOnSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, 672 SourceLocation LPLoc, TypeTy *Ty, 673 SourceLocation RPLoc) { 674 // If error parsing type, ignore. 675 if (Ty == 0) return true; 676 677 // Verify that this is a valid expression. 678 QualType ArgTy = QualType::getFromOpaquePtr(Ty); 679 680 QualType resultType = 681 CheckSizeOfAlignOfOperand(ArgTy, OpLoc, SourceRange(LPLoc, RPLoc),isSizeof); 682 683 if (resultType.isNull()) 684 return true; 685 return new SizeOfAlignOfTypeExpr(isSizeof, ArgTy, resultType, OpLoc, RPLoc); 686} 687 688QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 689 DefaultFunctionArrayConversion(V); 690 691 // These operators return the element type of a complex type. 692 if (const ComplexType *CT = V->getType()->getAsComplexType()) 693 return CT->getElementType(); 694 695 // Otherwise they pass through real integer and floating point types here. 696 if (V->getType()->isArithmeticType()) 697 return V->getType(); 698 699 // Reject anything else. 700 Diag(Loc, diag::err_realimag_invalid_type, V->getType().getAsString()); 701 return QualType(); 702} 703 704 705 706Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 707 tok::TokenKind Kind, 708 ExprTy *Input) { 709 UnaryOperator::Opcode Opc; 710 switch (Kind) { 711 default: assert(0 && "Unknown unary op!"); 712 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 713 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 714 } 715 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 716 if (result.isNull()) 717 return true; 718 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 719} 720 721Action::ExprResult Sema:: 722ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 723 ExprTy *Idx, SourceLocation RLoc) { 724 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 725 726 // Perform default conversions. 727 DefaultFunctionArrayConversion(LHSExp); 728 DefaultFunctionArrayConversion(RHSExp); 729 730 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 731 732 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 733 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 734 // in the subscript position. As a result, we need to derive the array base 735 // and index from the expression types. 736 Expr *BaseExpr, *IndexExpr; 737 QualType ResultType; 738 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 739 BaseExpr = LHSExp; 740 IndexExpr = RHSExp; 741 // FIXME: need to deal with const... 742 ResultType = PTy->getPointeeType(); 743 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 744 // Handle the uncommon case of "123[Ptr]". 745 BaseExpr = RHSExp; 746 IndexExpr = LHSExp; 747 // FIXME: need to deal with const... 748 ResultType = PTy->getPointeeType(); 749 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 750 BaseExpr = LHSExp; // vectors: V[123] 751 IndexExpr = RHSExp; 752 753 // Component access limited to variables (reject vec4.rg[1]). 754 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 755 !isa<ExtVectorElementExpr>(BaseExpr)) 756 return Diag(LLoc, diag::err_ext_vector_component_access, 757 SourceRange(LLoc, RLoc)); 758 // FIXME: need to deal with const... 759 ResultType = VTy->getElementType(); 760 } else { 761 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value, 762 RHSExp->getSourceRange()); 763 } 764 // C99 6.5.2.1p1 765 if (!IndexExpr->getType()->isIntegerType()) 766 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript, 767 IndexExpr->getSourceRange()); 768 769 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 770 // the following check catches trying to index a pointer to a function (e.g. 771 // void (*)(int)) and pointers to incomplete types. Functions are not 772 // objects in C99. 773 if (!ResultType->isObjectType()) 774 return Diag(BaseExpr->getLocStart(), 775 diag::err_typecheck_subscript_not_object, 776 BaseExpr->getType().getAsString(), BaseExpr->getSourceRange()); 777 778 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 779} 780 781QualType Sema:: 782CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 783 IdentifierInfo &CompName, SourceLocation CompLoc) { 784 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 785 786 // This flag determines whether or not the component is to be treated as a 787 // special name, or a regular GLSL-style component access. 788 bool SpecialComponent = false; 789 790 // The vector accessor can't exceed the number of elements. 791 const char *compStr = CompName.getName(); 792 if (strlen(compStr) > vecType->getNumElements()) { 793 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 794 baseType.getAsString(), SourceRange(CompLoc)); 795 return QualType(); 796 } 797 798 // Check that we've found one of the special components, or that the component 799 // names must come from the same set. 800 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 801 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 802 SpecialComponent = true; 803 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 804 do 805 compStr++; 806 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 807 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 808 do 809 compStr++; 810 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 811 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 812 do 813 compStr++; 814 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 815 } 816 817 if (!SpecialComponent && *compStr) { 818 // We didn't get to the end of the string. This means the component names 819 // didn't come from the same set *or* we encountered an illegal name. 820 Diag(OpLoc, diag::err_ext_vector_component_name_illegal, 821 std::string(compStr,compStr+1), SourceRange(CompLoc)); 822 return QualType(); 823 } 824 // Each component accessor can't exceed the vector type. 825 compStr = CompName.getName(); 826 while (*compStr) { 827 if (vecType->isAccessorWithinNumElements(*compStr)) 828 compStr++; 829 else 830 break; 831 } 832 if (!SpecialComponent && *compStr) { 833 // We didn't get to the end of the string. This means a component accessor 834 // exceeds the number of elements in the vector. 835 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 836 baseType.getAsString(), SourceRange(CompLoc)); 837 return QualType(); 838 } 839 840 // If we have a special component name, verify that the current vector length 841 // is an even number, since all special component names return exactly half 842 // the elements. 843 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 844 Diag(OpLoc, diag::err_ext_vector_component_requires_even, 845 baseType.getAsString(), SourceRange(CompLoc)); 846 return QualType(); 847 } 848 849 // The component accessor looks fine - now we need to compute the actual type. 850 // The vector type is implied by the component accessor. For example, 851 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 852 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 853 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 854 : strlen(CompName.getName()); 855 if (CompSize == 1) 856 return vecType->getElementType(); 857 858 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 859 // Now look up the TypeDefDecl from the vector type. Without this, 860 // diagostics look bad. We want extended vector types to appear built-in. 861 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 862 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 863 return Context.getTypedefType(ExtVectorDecls[i]); 864 } 865 return VT; // should never get here (a typedef type should always be found). 866} 867 868/// constructSetterName - Return the setter name for the given 869/// identifier, i.e. "set" + Name where the initial character of Name 870/// has been capitalized. 871// FIXME: Merge with same routine in Parser. But where should this 872// live? 873static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 874 const IdentifierInfo *Name) { 875 unsigned N = Name->getLength(); 876 char *SelectorName = new char[3 + N]; 877 memcpy(SelectorName, "set", 3); 878 memcpy(&SelectorName[3], Name->getName(), N); 879 SelectorName[3] = toupper(SelectorName[3]); 880 881 IdentifierInfo *Setter = 882 &Idents.get(SelectorName, &SelectorName[3 + N]); 883 delete[] SelectorName; 884 return Setter; 885} 886 887Action::ExprResult Sema:: 888ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 889 tok::TokenKind OpKind, SourceLocation MemberLoc, 890 IdentifierInfo &Member) { 891 Expr *BaseExpr = static_cast<Expr *>(Base); 892 assert(BaseExpr && "no record expression"); 893 894 // Perform default conversions. 895 DefaultFunctionArrayConversion(BaseExpr); 896 897 QualType BaseType = BaseExpr->getType(); 898 assert(!BaseType.isNull() && "no type for member expression"); 899 900 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 901 // must have pointer type, and the accessed type is the pointee. 902 if (OpKind == tok::arrow) { 903 if (const PointerType *PT = BaseType->getAsPointerType()) 904 BaseType = PT->getPointeeType(); 905 else 906 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow, 907 BaseType.getAsString(), BaseExpr->getSourceRange()); 908 } 909 910 // Handle field access to simple records. This also handles access to fields 911 // of the ObjC 'id' struct. 912 if (const RecordType *RTy = BaseType->getAsRecordType()) { 913 RecordDecl *RDecl = RTy->getDecl(); 914 if (RTy->isIncompleteType()) 915 return Diag(OpLoc, diag::err_typecheck_incomplete_tag, RDecl->getName(), 916 BaseExpr->getSourceRange()); 917 // The record definition is complete, now make sure the member is valid. 918 FieldDecl *MemberDecl = RDecl->getMember(&Member); 919 if (!MemberDecl) 920 return Diag(MemberLoc, diag::err_typecheck_no_member, Member.getName(), 921 BaseExpr->getSourceRange()); 922 923 // Figure out the type of the member; see C99 6.5.2.3p3 924 // FIXME: Handle address space modifiers 925 QualType MemberType = MemberDecl->getType(); 926 unsigned combinedQualifiers = 927 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 928 MemberType = MemberType.getQualifiedType(combinedQualifiers); 929 930 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 931 MemberLoc, MemberType); 932 } 933 934 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 935 // (*Obj).ivar. 936 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 937 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) 938 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 939 OpKind == tok::arrow); 940 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar, 941 IFTy->getDecl()->getName(), Member.getName(), 942 BaseExpr->getSourceRange()); 943 } 944 945 // Handle Objective-C property access, which is "Obj.property" where Obj is a 946 // pointer to a (potentially qualified) interface type. 947 const PointerType *PTy; 948 const ObjCInterfaceType *IFTy; 949 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 950 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 951 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 952 953 // Search for a declared property first. 954 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 955 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 956 957 // Check protocols on qualified interfaces. 958 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 959 E = IFTy->qual_end(); I != E; ++I) 960 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 961 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 962 963 // If that failed, look for an "implicit" property by seeing if the nullary 964 // selector is implemented. 965 966 // FIXME: The logic for looking up nullary and unary selectors should be 967 // shared with the code in ActOnInstanceMessage. 968 969 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 970 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 971 972 // If this reference is in an @implementation, check for 'private' methods. 973 if (!Getter) 974 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 975 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 976 if (ObjCImplementationDecl *ImpDecl = 977 ObjCImplementations[ClassDecl->getIdentifier()]) 978 Getter = ImpDecl->getInstanceMethod(Sel); 979 980 // Look through local category implementations associated with the class. 981 if (!Getter) { 982 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 983 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 984 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 985 } 986 } 987 if (Getter) { 988 // If we found a getter then this may be a valid dot-reference, we 989 // need to also look for the matching setter. 990 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 991 &Member); 992 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 993 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 994 995 if (!Setter) { 996 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 997 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 998 if (ObjCImplementationDecl *ImpDecl = 999 ObjCImplementations[ClassDecl->getIdentifier()]) 1000 Setter = ImpDecl->getInstanceMethod(SetterSel); 1001 } 1002 1003 // FIXME: There are some issues here. First, we are not 1004 // diagnosing accesses to read-only properties because we do not 1005 // know if this is a getter or setter yet. Second, we are 1006 // checking that the type of the setter matches the type we 1007 // expect. 1008 return new ObjCPropertyRefExpr(Getter, Setter, Getter->getResultType(), 1009 MemberLoc, BaseExpr); 1010 } 1011 } 1012 // Handle properties on qualified "id" protocols. 1013 const ObjCQualifiedIdType *QIdTy; 1014 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1015 // Check protocols on qualified interfaces. 1016 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1017 E = QIdTy->qual_end(); I != E; ++I) 1018 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1019 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1020 } 1021 // Handle 'field access' to vectors, such as 'V.xx'. 1022 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1023 // Component access limited to variables (reject vec4.rg.g). 1024 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1025 !isa<ExtVectorElementExpr>(BaseExpr)) 1026 return Diag(MemberLoc, diag::err_ext_vector_component_access, 1027 BaseExpr->getSourceRange()); 1028 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1029 if (ret.isNull()) 1030 return true; 1031 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1032 } 1033 1034 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union, 1035 BaseType.getAsString(), BaseExpr->getSourceRange()); 1036} 1037 1038/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1039/// This provides the location of the left/right parens and a list of comma 1040/// locations. 1041Action::ExprResult Sema:: 1042ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 1043 ExprTy **args, unsigned NumArgs, 1044 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1045 Expr *Fn = static_cast<Expr *>(fn); 1046 Expr **Args = reinterpret_cast<Expr**>(args); 1047 assert(Fn && "no function call expression"); 1048 FunctionDecl *FDecl = NULL; 1049 OverloadedFunctionDecl *Ovl = NULL; 1050 1051 // If we're directly calling a function or a set of overloaded 1052 // functions, get the appropriate declaration. 1053 { 1054 DeclRefExpr *DRExpr = NULL; 1055 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1056 DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()); 1057 else 1058 DRExpr = dyn_cast<DeclRefExpr>(Fn); 1059 1060 if (DRExpr) { 1061 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1062 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1063 } 1064 } 1065 1066 // If we have a set of overloaded functions, perform overload 1067 // resolution to pick the function. 1068 if (Ovl) { 1069 OverloadCandidateSet CandidateSet; 1070 OverloadCandidateSet::iterator Best; 1071 AddOverloadCandidates(Ovl, Args, NumArgs, CandidateSet); 1072 switch (BestViableFunction(CandidateSet, Best)) { 1073 case OR_Success: 1074 { 1075 // Success! Let the remainder of this function build a call to 1076 // the function selected by overload resolution. 1077 FDecl = Best->Function; 1078 Expr *NewFn = new DeclRefExpr(FDecl, FDecl->getType(), 1079 Fn->getSourceRange().getBegin()); 1080 delete Fn; 1081 Fn = NewFn; 1082 } 1083 break; 1084 1085 case OR_No_Viable_Function: 1086 if (CandidateSet.empty()) 1087 Diag(Fn->getSourceRange().getBegin(), 1088 diag::err_ovl_no_viable_function_in_call, Ovl->getName(), 1089 Fn->getSourceRange()); 1090 else { 1091 Diag(Fn->getSourceRange().getBegin(), 1092 diag::err_ovl_no_viable_function_in_call_with_cands, 1093 Ovl->getName(), Fn->getSourceRange()); 1094 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1095 } 1096 return true; 1097 1098 case OR_Ambiguous: 1099 Diag(Fn->getSourceRange().getBegin(), 1100 diag::err_ovl_ambiguous_call, Ovl->getName(), 1101 Fn->getSourceRange()); 1102 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1103 return true; 1104 } 1105 } 1106 1107 // Promote the function operand. 1108 UsualUnaryConversions(Fn); 1109 1110 // Make the call expr early, before semantic checks. This guarantees cleanup 1111 // of arguments and function on error. 1112 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1113 Context.BoolTy, RParenLoc)); 1114 const FunctionType *FuncT; 1115 if (!Fn->getType()->isBlockPointerType()) { 1116 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1117 // have type pointer to function". 1118 const PointerType *PT = Fn->getType()->getAsPointerType(); 1119 if (PT == 0) 1120 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1121 Fn->getSourceRange()); 1122 FuncT = PT->getPointeeType()->getAsFunctionType(); 1123 } else { // This is a block call. 1124 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1125 getAsFunctionType(); 1126 } 1127 if (FuncT == 0) 1128 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1129 Fn->getSourceRange()); 1130 1131 // We know the result type of the call, set it. 1132 TheCall->setType(FuncT->getResultType()); 1133 1134 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1135 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1136 // assignment, to the types of the corresponding parameter, ... 1137 unsigned NumArgsInProto = Proto->getNumArgs(); 1138 unsigned NumArgsToCheck = NumArgs; 1139 1140 // If too few arguments are available (and we don't have default 1141 // arguments for the remaining parameters), don't make the call. 1142 if (NumArgs < NumArgsInProto) { 1143 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 1144 // Use default arguments for missing arguments 1145 NumArgsToCheck = NumArgsInProto; 1146 TheCall->setNumArgs(NumArgsInProto); 1147 } else 1148 return Diag(RParenLoc, 1149 !Fn->getType()->isBlockPointerType() 1150 ? diag::err_typecheck_call_too_few_args 1151 : diag::err_typecheck_block_too_few_args, 1152 Fn->getSourceRange()); 1153 } 1154 1155 // If too many are passed and not variadic, error on the extras and drop 1156 // them. 1157 if (NumArgs > NumArgsInProto) { 1158 if (!Proto->isVariadic()) { 1159 Diag(Args[NumArgsInProto]->getLocStart(), 1160 !Fn->getType()->isBlockPointerType() 1161 ? diag::err_typecheck_call_too_many_args 1162 : diag::err_typecheck_block_too_many_args, 1163 Fn->getSourceRange(), 1164 SourceRange(Args[NumArgsInProto]->getLocStart(), 1165 Args[NumArgs-1]->getLocEnd())); 1166 // This deletes the extra arguments. 1167 TheCall->setNumArgs(NumArgsInProto); 1168 } 1169 NumArgsToCheck = NumArgsInProto; 1170 } 1171 1172 // Continue to check argument types (even if we have too few/many args). 1173 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1174 QualType ProtoArgType = Proto->getArgType(i); 1175 1176 Expr *Arg; 1177 if (i < NumArgs) 1178 Arg = Args[i]; 1179 else 1180 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1181 QualType ArgType = Arg->getType(); 1182 1183 // Compute implicit casts from the operand to the formal argument type. 1184 AssignConvertType ConvTy = 1185 CheckSingleAssignmentConstraints(ProtoArgType, Arg); 1186 TheCall->setArg(i, Arg); 1187 1188 if (DiagnoseAssignmentResult(ConvTy, Arg->getLocStart(), ProtoArgType, 1189 ArgType, Arg, "passing")) 1190 return true; 1191 } 1192 1193 // If this is a variadic call, handle args passed through "...". 1194 if (Proto->isVariadic()) { 1195 // Promote the arguments (C99 6.5.2.2p7). 1196 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1197 Expr *Arg = Args[i]; 1198 DefaultArgumentPromotion(Arg); 1199 TheCall->setArg(i, Arg); 1200 } 1201 } 1202 } else { 1203 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1204 1205 // Promote the arguments (C99 6.5.2.2p6). 1206 for (unsigned i = 0; i != NumArgs; i++) { 1207 Expr *Arg = Args[i]; 1208 DefaultArgumentPromotion(Arg); 1209 TheCall->setArg(i, Arg); 1210 } 1211 } 1212 1213 // Do special checking on direct calls to functions. 1214 if (FDecl) 1215 return CheckFunctionCall(FDecl, TheCall.take()); 1216 1217 return TheCall.take(); 1218} 1219 1220Action::ExprResult Sema:: 1221ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1222 SourceLocation RParenLoc, ExprTy *InitExpr) { 1223 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1224 QualType literalType = QualType::getFromOpaquePtr(Ty); 1225 // FIXME: put back this assert when initializers are worked out. 1226 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1227 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1228 1229 if (literalType->isArrayType()) { 1230 if (literalType->isVariableArrayType()) 1231 return Diag(LParenLoc, 1232 diag::err_variable_object_no_init, 1233 SourceRange(LParenLoc, 1234 literalExpr->getSourceRange().getEnd())); 1235 } else if (literalType->isIncompleteType()) { 1236 return Diag(LParenLoc, 1237 diag::err_typecheck_decl_incomplete_type, 1238 literalType.getAsString(), 1239 SourceRange(LParenLoc, 1240 literalExpr->getSourceRange().getEnd())); 1241 } 1242 1243 if (CheckInitializerTypes(literalExpr, literalType)) 1244 return true; 1245 1246 bool isFileScope = !getCurFunctionDecl() && !getCurMethodDecl(); 1247 if (isFileScope) { // 6.5.2.5p3 1248 if (CheckForConstantInitializer(literalExpr, literalType)) 1249 return true; 1250 } 1251 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, 1252 isFileScope); 1253} 1254 1255Action::ExprResult Sema:: 1256ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1257 InitListDesignations &Designators, 1258 SourceLocation RBraceLoc) { 1259 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1260 1261 // Semantic analysis for initializers is done by ActOnDeclarator() and 1262 // CheckInitializer() - it requires knowledge of the object being intialized. 1263 1264 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc, 1265 Designators.hasAnyDesignators()); 1266 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1267 return E; 1268} 1269 1270/// CheckCastTypes - Check type constraints for casting between types. 1271bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1272 UsualUnaryConversions(castExpr); 1273 1274 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1275 // type needs to be scalar. 1276 if (castType->isVoidType()) { 1277 // Cast to void allows any expr type. 1278 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1279 // GCC struct/union extension: allow cast to self. 1280 if (Context.getCanonicalType(castType) != 1281 Context.getCanonicalType(castExpr->getType()) || 1282 (!castType->isStructureType() && !castType->isUnionType())) { 1283 // Reject any other conversions to non-scalar types. 1284 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar, 1285 castType.getAsString(), castExpr->getSourceRange()); 1286 } 1287 1288 // accept this, but emit an ext-warn. 1289 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar, 1290 castType.getAsString(), castExpr->getSourceRange()); 1291 } else if (!castExpr->getType()->isScalarType() && 1292 !castExpr->getType()->isVectorType()) { 1293 return Diag(castExpr->getLocStart(), 1294 diag::err_typecheck_expect_scalar_operand, 1295 castExpr->getType().getAsString(),castExpr->getSourceRange()); 1296 } else if (castExpr->getType()->isVectorType()) { 1297 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1298 return true; 1299 } else if (castType->isVectorType()) { 1300 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1301 return true; 1302 } 1303 return false; 1304} 1305 1306bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1307 assert(VectorTy->isVectorType() && "Not a vector type!"); 1308 1309 if (Ty->isVectorType() || Ty->isIntegerType()) { 1310 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1311 return Diag(R.getBegin(), 1312 Ty->isVectorType() ? 1313 diag::err_invalid_conversion_between_vectors : 1314 diag::err_invalid_conversion_between_vector_and_integer, 1315 VectorTy.getAsString().c_str(), 1316 Ty.getAsString().c_str(), R); 1317 } else 1318 return Diag(R.getBegin(), 1319 diag::err_invalid_conversion_between_vector_and_scalar, 1320 VectorTy.getAsString().c_str(), 1321 Ty.getAsString().c_str(), R); 1322 1323 return false; 1324} 1325 1326Action::ExprResult Sema:: 1327ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1328 SourceLocation RParenLoc, ExprTy *Op) { 1329 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1330 1331 Expr *castExpr = static_cast<Expr*>(Op); 1332 QualType castType = QualType::getFromOpaquePtr(Ty); 1333 1334 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1335 return true; 1336 return new ExplicitCCastExpr(castType, castExpr, castType, LParenLoc); 1337} 1338 1339/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1340/// In that case, lex = cond. 1341inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1342 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1343 UsualUnaryConversions(cond); 1344 UsualUnaryConversions(lex); 1345 UsualUnaryConversions(rex); 1346 QualType condT = cond->getType(); 1347 QualType lexT = lex->getType(); 1348 QualType rexT = rex->getType(); 1349 1350 // first, check the condition. 1351 if (!condT->isScalarType()) { // C99 6.5.15p2 1352 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 1353 condT.getAsString()); 1354 return QualType(); 1355 } 1356 1357 // Now check the two expressions. 1358 1359 // If both operands have arithmetic type, do the usual arithmetic conversions 1360 // to find a common type: C99 6.5.15p3,5. 1361 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1362 UsualArithmeticConversions(lex, rex); 1363 return lex->getType(); 1364 } 1365 1366 // If both operands are the same structure or union type, the result is that 1367 // type. 1368 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1369 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1370 if (LHSRT->getDecl() == RHSRT->getDecl()) 1371 // "If both the operands have structure or union type, the result has 1372 // that type." This implies that CV qualifiers are dropped. 1373 return lexT.getUnqualifiedType(); 1374 } 1375 1376 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1377 // The following || allows only one side to be void (a GCC-ism). 1378 if (lexT->isVoidType() || rexT->isVoidType()) { 1379 if (!lexT->isVoidType()) 1380 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 1381 rex->getSourceRange()); 1382 if (!rexT->isVoidType()) 1383 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 1384 lex->getSourceRange()); 1385 ImpCastExprToType(lex, Context.VoidTy); 1386 ImpCastExprToType(rex, Context.VoidTy); 1387 return Context.VoidTy; 1388 } 1389 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1390 // the type of the other operand." 1391 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1392 Context.isObjCObjectPointerType(lexT)) && 1393 rex->isNullPointerConstant(Context)) { 1394 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1395 return lexT; 1396 } 1397 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1398 Context.isObjCObjectPointerType(rexT)) && 1399 lex->isNullPointerConstant(Context)) { 1400 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1401 return rexT; 1402 } 1403 // Handle the case where both operands are pointers before we handle null 1404 // pointer constants in case both operands are null pointer constants. 1405 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1406 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1407 // get the "pointed to" types 1408 QualType lhptee = LHSPT->getPointeeType(); 1409 QualType rhptee = RHSPT->getPointeeType(); 1410 1411 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1412 if (lhptee->isVoidType() && 1413 rhptee->isIncompleteOrObjectType()) { 1414 // Figure out necessary qualifiers (C99 6.5.15p6) 1415 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1416 QualType destType = Context.getPointerType(destPointee); 1417 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1418 ImpCastExprToType(rex, destType); // promote to void* 1419 return destType; 1420 } 1421 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1422 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1423 QualType destType = Context.getPointerType(destPointee); 1424 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1425 ImpCastExprToType(rex, destType); // promote to void* 1426 return destType; 1427 } 1428 1429 QualType compositeType = lexT; 1430 1431 // If either type is an Objective-C object type then check 1432 // compatibility according to Objective-C. 1433 if (Context.isObjCObjectPointerType(lexT) || 1434 Context.isObjCObjectPointerType(rexT)) { 1435 // If both operands are interfaces and either operand can be 1436 // assigned to the other, use that type as the composite 1437 // type. This allows 1438 // xxx ? (A*) a : (B*) b 1439 // where B is a subclass of A. 1440 // 1441 // Additionally, as for assignment, if either type is 'id' 1442 // allow silent coercion. Finally, if the types are 1443 // incompatible then make sure to use 'id' as the composite 1444 // type so the result is acceptable for sending messages to. 1445 1446 // FIXME: This code should not be localized to here. Also this 1447 // should use a compatible check instead of abusing the 1448 // canAssignObjCInterfaces code. 1449 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1450 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1451 if (LHSIface && RHSIface && 1452 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1453 compositeType = lexT; 1454 } else if (LHSIface && RHSIface && 1455 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1456 compositeType = rexT; 1457 } else if (Context.isObjCIdType(lhptee) || 1458 Context.isObjCIdType(rhptee)) { 1459 // FIXME: This code looks wrong, because isObjCIdType checks 1460 // the struct but getObjCIdType returns the pointer to 1461 // struct. This is horrible and should be fixed. 1462 compositeType = Context.getObjCIdType(); 1463 } else { 1464 QualType incompatTy = Context.getObjCIdType(); 1465 ImpCastExprToType(lex, incompatTy); 1466 ImpCastExprToType(rex, incompatTy); 1467 return incompatTy; 1468 } 1469 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1470 rhptee.getUnqualifiedType())) { 1471 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 1472 lexT.getAsString(), rexT.getAsString(), 1473 lex->getSourceRange(), rex->getSourceRange()); 1474 // In this situation, we assume void* type. No especially good 1475 // reason, but this is what gcc does, and we do have to pick 1476 // to get a consistent AST. 1477 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1478 ImpCastExprToType(lex, incompatTy); 1479 ImpCastExprToType(rex, incompatTy); 1480 return incompatTy; 1481 } 1482 // The pointer types are compatible. 1483 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1484 // differently qualified versions of compatible types, the result type is 1485 // a pointer to an appropriately qualified version of the *composite* 1486 // type. 1487 // FIXME: Need to calculate the composite type. 1488 // FIXME: Need to add qualifiers 1489 ImpCastExprToType(lex, compositeType); 1490 ImpCastExprToType(rex, compositeType); 1491 return compositeType; 1492 } 1493 } 1494 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1495 // evaluates to "struct objc_object *" (and is handled above when comparing 1496 // id with statically typed objects). 1497 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1498 // GCC allows qualified id and any Objective-C type to devolve to 1499 // id. Currently localizing to here until clear this should be 1500 // part of ObjCQualifiedIdTypesAreCompatible. 1501 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1502 (lexT->isObjCQualifiedIdType() && 1503 Context.isObjCObjectPointerType(rexT)) || 1504 (rexT->isObjCQualifiedIdType() && 1505 Context.isObjCObjectPointerType(lexT))) { 1506 // FIXME: This is not the correct composite type. This only 1507 // happens to work because id can more or less be used anywhere, 1508 // however this may change the type of method sends. 1509 // FIXME: gcc adds some type-checking of the arguments and emits 1510 // (confusing) incompatible comparison warnings in some 1511 // cases. Investigate. 1512 QualType compositeType = Context.getObjCIdType(); 1513 ImpCastExprToType(lex, compositeType); 1514 ImpCastExprToType(rex, compositeType); 1515 return compositeType; 1516 } 1517 } 1518 1519 // Selection between block pointer types is ok as long as they are the same. 1520 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1521 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1522 return lexT; 1523 1524 // Otherwise, the operands are not compatible. 1525 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 1526 lexT.getAsString(), rexT.getAsString(), 1527 lex->getSourceRange(), rex->getSourceRange()); 1528 return QualType(); 1529} 1530 1531/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1532/// in the case of a the GNU conditional expr extension. 1533Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1534 SourceLocation ColonLoc, 1535 ExprTy *Cond, ExprTy *LHS, 1536 ExprTy *RHS) { 1537 Expr *CondExpr = (Expr *) Cond; 1538 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1539 1540 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1541 // was the condition. 1542 bool isLHSNull = LHSExpr == 0; 1543 if (isLHSNull) 1544 LHSExpr = CondExpr; 1545 1546 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1547 RHSExpr, QuestionLoc); 1548 if (result.isNull()) 1549 return true; 1550 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1551 RHSExpr, result); 1552} 1553 1554 1555// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1556// being closely modeled after the C99 spec:-). The odd characteristic of this 1557// routine is it effectively iqnores the qualifiers on the top level pointee. 1558// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1559// FIXME: add a couple examples in this comment. 1560Sema::AssignConvertType 1561Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1562 QualType lhptee, rhptee; 1563 1564 // get the "pointed to" type (ignoring qualifiers at the top level) 1565 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1566 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1567 1568 // make sure we operate on the canonical type 1569 lhptee = Context.getCanonicalType(lhptee); 1570 rhptee = Context.getCanonicalType(rhptee); 1571 1572 AssignConvertType ConvTy = Compatible; 1573 1574 // C99 6.5.16.1p1: This following citation is common to constraints 1575 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1576 // qualifiers of the type *pointed to* by the right; 1577 // FIXME: Handle ASQualType 1578 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 1579 ConvTy = CompatiblePointerDiscardsQualifiers; 1580 1581 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1582 // incomplete type and the other is a pointer to a qualified or unqualified 1583 // version of void... 1584 if (lhptee->isVoidType()) { 1585 if (rhptee->isIncompleteOrObjectType()) 1586 return ConvTy; 1587 1588 // As an extension, we allow cast to/from void* to function pointer. 1589 assert(rhptee->isFunctionType()); 1590 return FunctionVoidPointer; 1591 } 1592 1593 if (rhptee->isVoidType()) { 1594 if (lhptee->isIncompleteOrObjectType()) 1595 return ConvTy; 1596 1597 // As an extension, we allow cast to/from void* to function pointer. 1598 assert(lhptee->isFunctionType()); 1599 return FunctionVoidPointer; 1600 } 1601 1602 // Check for ObjC interfaces 1603 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1604 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1605 if (LHSIface && RHSIface && 1606 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1607 return ConvTy; 1608 1609 // ID acts sort of like void* for ObjC interfaces 1610 if (LHSIface && Context.isObjCIdType(rhptee)) 1611 return ConvTy; 1612 if (RHSIface && Context.isObjCIdType(lhptee)) 1613 return ConvTy; 1614 1615 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1616 // unqualified versions of compatible types, ... 1617 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1618 rhptee.getUnqualifiedType())) 1619 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1620 return ConvTy; 1621} 1622 1623/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1624/// block pointer types are compatible or whether a block and normal pointer 1625/// are compatible. It is more restrict than comparing two function pointer 1626// types. 1627Sema::AssignConvertType 1628Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1629 QualType rhsType) { 1630 QualType lhptee, rhptee; 1631 1632 // get the "pointed to" type (ignoring qualifiers at the top level) 1633 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1634 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1635 1636 // make sure we operate on the canonical type 1637 lhptee = Context.getCanonicalType(lhptee); 1638 rhptee = Context.getCanonicalType(rhptee); 1639 1640 AssignConvertType ConvTy = Compatible; 1641 1642 // For blocks we enforce that qualifiers are identical. 1643 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1644 ConvTy = CompatiblePointerDiscardsQualifiers; 1645 1646 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1647 return IncompatibleBlockPointer; 1648 return ConvTy; 1649} 1650 1651/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1652/// has code to accommodate several GCC extensions when type checking 1653/// pointers. Here are some objectionable examples that GCC considers warnings: 1654/// 1655/// int a, *pint; 1656/// short *pshort; 1657/// struct foo *pfoo; 1658/// 1659/// pint = pshort; // warning: assignment from incompatible pointer type 1660/// a = pint; // warning: assignment makes integer from pointer without a cast 1661/// pint = a; // warning: assignment makes pointer from integer without a cast 1662/// pint = pfoo; // warning: assignment from incompatible pointer type 1663/// 1664/// As a result, the code for dealing with pointers is more complex than the 1665/// C99 spec dictates. 1666/// 1667Sema::AssignConvertType 1668Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1669 // Get canonical types. We're not formatting these types, just comparing 1670 // them. 1671 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1672 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1673 1674 if (lhsType == rhsType) 1675 return Compatible; // Common case: fast path an exact match. 1676 1677 if (lhsType->isReferenceType() || rhsType->isReferenceType()) { 1678 if (Context.typesAreCompatible(lhsType, rhsType)) 1679 return Compatible; 1680 return Incompatible; 1681 } 1682 1683 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1684 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1685 return Compatible; 1686 // Relax integer conversions like we do for pointers below. 1687 if (rhsType->isIntegerType()) 1688 return IntToPointer; 1689 if (lhsType->isIntegerType()) 1690 return PointerToInt; 1691 return IncompatibleObjCQualifiedId; 1692 } 1693 1694 if (lhsType->isVectorType() || rhsType->isVectorType()) { 1695 // For ExtVector, allow vector splats; float -> <n x float> 1696 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 1697 if (LV->getElementType() == rhsType) 1698 return Compatible; 1699 1700 // If we are allowing lax vector conversions, and LHS and RHS are both 1701 // vectors, the total size only needs to be the same. This is a bitcast; 1702 // no bits are changed but the result type is different. 1703 if (getLangOptions().LaxVectorConversions && 1704 lhsType->isVectorType() && rhsType->isVectorType()) { 1705 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1706 return Compatible; 1707 } 1708 return Incompatible; 1709 } 1710 1711 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1712 return Compatible; 1713 1714 if (isa<PointerType>(lhsType)) { 1715 if (rhsType->isIntegerType()) 1716 return IntToPointer; 1717 1718 if (isa<PointerType>(rhsType)) 1719 return CheckPointerTypesForAssignment(lhsType, rhsType); 1720 1721 if (rhsType->getAsBlockPointerType()) { 1722 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1723 return BlockVoidPointer; 1724 1725 // Treat block pointers as objects. 1726 if (getLangOptions().ObjC1 && 1727 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 1728 return Compatible; 1729 } 1730 return Incompatible; 1731 } 1732 1733 if (isa<BlockPointerType>(lhsType)) { 1734 if (rhsType->isIntegerType()) 1735 return IntToPointer; 1736 1737 // Treat block pointers as objects. 1738 if (getLangOptions().ObjC1 && 1739 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 1740 return Compatible; 1741 1742 if (rhsType->isBlockPointerType()) 1743 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 1744 1745 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 1746 if (RHSPT->getPointeeType()->isVoidType()) 1747 return BlockVoidPointer; 1748 } 1749 return Incompatible; 1750 } 1751 1752 if (isa<PointerType>(rhsType)) { 1753 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1754 if (lhsType == Context.BoolTy) 1755 return Compatible; 1756 1757 if (lhsType->isIntegerType()) 1758 return PointerToInt; 1759 1760 if (isa<PointerType>(lhsType)) 1761 return CheckPointerTypesForAssignment(lhsType, rhsType); 1762 1763 if (isa<BlockPointerType>(lhsType) && 1764 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1765 return BlockVoidPointer; 1766 return Incompatible; 1767 } 1768 1769 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1770 if (Context.typesAreCompatible(lhsType, rhsType)) 1771 return Compatible; 1772 } 1773 return Incompatible; 1774} 1775 1776Sema::AssignConvertType 1777Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1778 if (getLangOptions().CPlusPlus) { 1779 if (!lhsType->isRecordType()) { 1780 // C++ 5.17p3: If the left operand is not of class type, the 1781 // expression is implicitly converted (C++ 4) to the 1782 // cv-unqualified type of the left operand. 1783 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType())) 1784 return Incompatible; 1785 else 1786 return Compatible; 1787 } 1788 1789 // FIXME: Currently, we fall through and treat C++ classes like C 1790 // structures. 1791 } 1792 1793 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1794 // a null pointer constant. 1795 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 1796 lhsType->isBlockPointerType()) 1797 && rExpr->isNullPointerConstant(Context)) { 1798 ImpCastExprToType(rExpr, lhsType); 1799 return Compatible; 1800 } 1801 1802 // We don't allow conversion of non-null-pointer constants to integers. 1803 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 1804 return IntToBlockPointer; 1805 1806 // This check seems unnatural, however it is necessary to ensure the proper 1807 // conversion of functions/arrays. If the conversion were done for all 1808 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1809 // expressions that surpress this implicit conversion (&, sizeof). 1810 // 1811 // Suppress this for references: C++ 8.5.3p5. FIXME: revisit when references 1812 // are better understood. 1813 if (!lhsType->isReferenceType()) 1814 DefaultFunctionArrayConversion(rExpr); 1815 1816 Sema::AssignConvertType result = 1817 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1818 1819 // C99 6.5.16.1p2: The value of the right operand is converted to the 1820 // type of the assignment expression. 1821 if (rExpr->getType() != lhsType) 1822 ImpCastExprToType(rExpr, lhsType); 1823 return result; 1824} 1825 1826Sema::AssignConvertType 1827Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1828 return CheckAssignmentConstraints(lhsType, rhsType); 1829} 1830 1831QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1832 Diag(loc, diag::err_typecheck_invalid_operands, 1833 lex->getType().getAsString(), rex->getType().getAsString(), 1834 lex->getSourceRange(), rex->getSourceRange()); 1835 return QualType(); 1836} 1837 1838inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1839 Expr *&rex) { 1840 // For conversion purposes, we ignore any qualifiers. 1841 // For example, "const float" and "float" are equivalent. 1842 QualType lhsType = 1843 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 1844 QualType rhsType = 1845 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 1846 1847 // If the vector types are identical, return. 1848 if (lhsType == rhsType) 1849 return lhsType; 1850 1851 // Handle the case of a vector & extvector type of the same size and element 1852 // type. It would be nice if we only had one vector type someday. 1853 if (getLangOptions().LaxVectorConversions) 1854 if (const VectorType *LV = lhsType->getAsVectorType()) 1855 if (const VectorType *RV = rhsType->getAsVectorType()) 1856 if (LV->getElementType() == RV->getElementType() && 1857 LV->getNumElements() == RV->getNumElements()) 1858 return lhsType->isExtVectorType() ? lhsType : rhsType; 1859 1860 // If the lhs is an extended vector and the rhs is a scalar of the same type 1861 // or a literal, promote the rhs to the vector type. 1862 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1863 QualType eltType = V->getElementType(); 1864 1865 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 1866 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 1867 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 1868 ImpCastExprToType(rex, lhsType); 1869 return lhsType; 1870 } 1871 } 1872 1873 // If the rhs is an extended vector and the lhs is a scalar of the same type, 1874 // promote the lhs to the vector type. 1875 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1876 QualType eltType = V->getElementType(); 1877 1878 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 1879 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 1880 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 1881 ImpCastExprToType(lex, rhsType); 1882 return rhsType; 1883 } 1884 } 1885 1886 // You cannot convert between vector values of different size. 1887 Diag(loc, diag::err_typecheck_vector_not_convertable, 1888 lex->getType().getAsString(), rex->getType().getAsString(), 1889 lex->getSourceRange(), rex->getSourceRange()); 1890 return QualType(); 1891} 1892 1893inline QualType Sema::CheckMultiplyDivideOperands( 1894 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1895{ 1896 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1897 1898 if (lhsType->isVectorType() || rhsType->isVectorType()) 1899 return CheckVectorOperands(loc, lex, rex); 1900 1901 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1902 1903 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1904 return compType; 1905 return InvalidOperands(loc, lex, rex); 1906} 1907 1908inline QualType Sema::CheckRemainderOperands( 1909 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1910{ 1911 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1912 1913 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1914 1915 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1916 return compType; 1917 return InvalidOperands(loc, lex, rex); 1918} 1919 1920inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1921 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1922{ 1923 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1924 return CheckVectorOperands(loc, lex, rex); 1925 1926 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1927 1928 // handle the common case first (both operands are arithmetic). 1929 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1930 return compType; 1931 1932 // Put any potential pointer into PExp 1933 Expr* PExp = lex, *IExp = rex; 1934 if (IExp->getType()->isPointerType()) 1935 std::swap(PExp, IExp); 1936 1937 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1938 if (IExp->getType()->isIntegerType()) { 1939 // Check for arithmetic on pointers to incomplete types 1940 if (!PTy->getPointeeType()->isObjectType()) { 1941 if (PTy->getPointeeType()->isVoidType()) { 1942 Diag(loc, diag::ext_gnu_void_ptr, 1943 lex->getSourceRange(), rex->getSourceRange()); 1944 } else { 1945 Diag(loc, diag::err_typecheck_arithmetic_incomplete_type, 1946 lex->getType().getAsString(), lex->getSourceRange()); 1947 return QualType(); 1948 } 1949 } 1950 return PExp->getType(); 1951 } 1952 } 1953 1954 return InvalidOperands(loc, lex, rex); 1955} 1956 1957// C99 6.5.6 1958QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1959 SourceLocation loc, bool isCompAssign) { 1960 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1961 return CheckVectorOperands(loc, lex, rex); 1962 1963 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1964 1965 // Enforce type constraints: C99 6.5.6p3. 1966 1967 // Handle the common case first (both operands are arithmetic). 1968 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1969 return compType; 1970 1971 // Either ptr - int or ptr - ptr. 1972 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1973 QualType lpointee = LHSPTy->getPointeeType(); 1974 1975 // The LHS must be an object type, not incomplete, function, etc. 1976 if (!lpointee->isObjectType()) { 1977 // Handle the GNU void* extension. 1978 if (lpointee->isVoidType()) { 1979 Diag(loc, diag::ext_gnu_void_ptr, 1980 lex->getSourceRange(), rex->getSourceRange()); 1981 } else { 1982 Diag(loc, diag::err_typecheck_sub_ptr_object, 1983 lex->getType().getAsString(), lex->getSourceRange()); 1984 return QualType(); 1985 } 1986 } 1987 1988 // The result type of a pointer-int computation is the pointer type. 1989 if (rex->getType()->isIntegerType()) 1990 return lex->getType(); 1991 1992 // Handle pointer-pointer subtractions. 1993 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 1994 QualType rpointee = RHSPTy->getPointeeType(); 1995 1996 // RHS must be an object type, unless void (GNU). 1997 if (!rpointee->isObjectType()) { 1998 // Handle the GNU void* extension. 1999 if (rpointee->isVoidType()) { 2000 if (!lpointee->isVoidType()) 2001 Diag(loc, diag::ext_gnu_void_ptr, 2002 lex->getSourceRange(), rex->getSourceRange()); 2003 } else { 2004 Diag(loc, diag::err_typecheck_sub_ptr_object, 2005 rex->getType().getAsString(), rex->getSourceRange()); 2006 return QualType(); 2007 } 2008 } 2009 2010 // Pointee types must be compatible. 2011 if (!Context.typesAreCompatible( 2012 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2013 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2014 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 2015 lex->getType().getAsString(), rex->getType().getAsString(), 2016 lex->getSourceRange(), rex->getSourceRange()); 2017 return QualType(); 2018 } 2019 2020 return Context.getPointerDiffType(); 2021 } 2022 } 2023 2024 return InvalidOperands(loc, lex, rex); 2025} 2026 2027// C99 6.5.7 2028QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 2029 bool isCompAssign) { 2030 // C99 6.5.7p2: Each of the operands shall have integer type. 2031 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2032 return InvalidOperands(loc, lex, rex); 2033 2034 // Shifts don't perform usual arithmetic conversions, they just do integer 2035 // promotions on each operand. C99 6.5.7p3 2036 if (!isCompAssign) 2037 UsualUnaryConversions(lex); 2038 UsualUnaryConversions(rex); 2039 2040 // "The type of the result is that of the promoted left operand." 2041 return lex->getType(); 2042} 2043 2044static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 2045 ASTContext& Context) { 2046 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2047 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2048 // ID acts sort of like void* for ObjC interfaces 2049 if (LHSIface && Context.isObjCIdType(RHS)) 2050 return true; 2051 if (RHSIface && Context.isObjCIdType(LHS)) 2052 return true; 2053 if (!LHSIface || !RHSIface) 2054 return false; 2055 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 2056 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 2057} 2058 2059// C99 6.5.8 2060QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 2061 bool isRelational) { 2062 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2063 return CheckVectorCompareOperands(lex, rex, loc, isRelational); 2064 2065 // C99 6.5.8p3 / C99 6.5.9p4 2066 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2067 UsualArithmeticConversions(lex, rex); 2068 else { 2069 UsualUnaryConversions(lex); 2070 UsualUnaryConversions(rex); 2071 } 2072 QualType lType = lex->getType(); 2073 QualType rType = rex->getType(); 2074 2075 // For non-floating point types, check for self-comparisons of the form 2076 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2077 // often indicate logic errors in the program. 2078 if (!lType->isFloatingType()) { 2079 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2080 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2081 if (DRL->getDecl() == DRR->getDecl()) 2082 Diag(loc, diag::warn_selfcomparison); 2083 } 2084 2085 if (isRelational) { 2086 if (lType->isRealType() && rType->isRealType()) 2087 return Context.IntTy; 2088 } else { 2089 // Check for comparisons of floating point operands using != and ==. 2090 if (lType->isFloatingType()) { 2091 assert (rType->isFloatingType()); 2092 CheckFloatComparison(loc,lex,rex); 2093 } 2094 2095 if (lType->isArithmeticType() && rType->isArithmeticType()) 2096 return Context.IntTy; 2097 } 2098 2099 bool LHSIsNull = lex->isNullPointerConstant(Context); 2100 bool RHSIsNull = rex->isNullPointerConstant(Context); 2101 2102 // All of the following pointer related warnings are GCC extensions, except 2103 // when handling null pointer constants. One day, we can consider making them 2104 // errors (when -pedantic-errors is enabled). 2105 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2106 QualType LCanPointeeTy = 2107 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2108 QualType RCanPointeeTy = 2109 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2110 2111 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2112 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2113 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2114 RCanPointeeTy.getUnqualifiedType()) && 2115 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2116 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2117 lType.getAsString(), rType.getAsString(), 2118 lex->getSourceRange(), rex->getSourceRange()); 2119 } 2120 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2121 return Context.IntTy; 2122 } 2123 // Handle block pointer types. 2124 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2125 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2126 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2127 2128 if (!LHSIsNull && !RHSIsNull && 2129 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2130 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2131 lType.getAsString(), rType.getAsString(), 2132 lex->getSourceRange(), rex->getSourceRange()); 2133 } 2134 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2135 return Context.IntTy; 2136 } 2137 // Allow block pointers to be compared with null pointer constants. 2138 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2139 (lType->isPointerType() && rType->isBlockPointerType())) { 2140 if (!LHSIsNull && !RHSIsNull) { 2141 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2142 lType.getAsString(), rType.getAsString(), 2143 lex->getSourceRange(), rex->getSourceRange()); 2144 } 2145 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2146 return Context.IntTy; 2147 } 2148 2149 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2150 if (lType->isPointerType() || rType->isPointerType()) { 2151 if (!Context.typesAreCompatible(lType, rType)) { 2152 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2153 lType.getAsString(), rType.getAsString(), 2154 lex->getSourceRange(), rex->getSourceRange()); 2155 ImpCastExprToType(rex, lType); 2156 return Context.IntTy; 2157 } 2158 ImpCastExprToType(rex, lType); 2159 return Context.IntTy; 2160 } 2161 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2162 ImpCastExprToType(rex, lType); 2163 return Context.IntTy; 2164 } else { 2165 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2166 Diag(loc, diag::warn_incompatible_qualified_id_operands, 2167 lType.getAsString(), rType.getAsString(), 2168 lex->getSourceRange(), rex->getSourceRange()); 2169 ImpCastExprToType(rex, lType); 2170 return Context.IntTy; 2171 } 2172 } 2173 } 2174 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2175 rType->isIntegerType()) { 2176 if (!RHSIsNull) 2177 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2178 lType.getAsString(), rType.getAsString(), 2179 lex->getSourceRange(), rex->getSourceRange()); 2180 ImpCastExprToType(rex, lType); // promote the integer to pointer 2181 return Context.IntTy; 2182 } 2183 if (lType->isIntegerType() && 2184 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2185 if (!LHSIsNull) 2186 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2187 lType.getAsString(), rType.getAsString(), 2188 lex->getSourceRange(), rex->getSourceRange()); 2189 ImpCastExprToType(lex, rType); // promote the integer to pointer 2190 return Context.IntTy; 2191 } 2192 // Handle block pointers. 2193 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2194 if (!RHSIsNull) 2195 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2196 lType.getAsString(), rType.getAsString(), 2197 lex->getSourceRange(), rex->getSourceRange()); 2198 ImpCastExprToType(rex, lType); // promote the integer to pointer 2199 return Context.IntTy; 2200 } 2201 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2202 if (!LHSIsNull) 2203 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2204 lType.getAsString(), rType.getAsString(), 2205 lex->getSourceRange(), rex->getSourceRange()); 2206 ImpCastExprToType(lex, rType); // promote the integer to pointer 2207 return Context.IntTy; 2208 } 2209 return InvalidOperands(loc, lex, rex); 2210} 2211 2212/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2213/// operates on extended vector types. Instead of producing an IntTy result, 2214/// like a scalar comparison, a vector comparison produces a vector of integer 2215/// types. 2216QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2217 SourceLocation loc, 2218 bool isRelational) { 2219 // Check to make sure we're operating on vectors of the same type and width, 2220 // Allowing one side to be a scalar of element type. 2221 QualType vType = CheckVectorOperands(loc, lex, rex); 2222 if (vType.isNull()) 2223 return vType; 2224 2225 QualType lType = lex->getType(); 2226 QualType rType = rex->getType(); 2227 2228 // For non-floating point types, check for self-comparisons of the form 2229 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2230 // often indicate logic errors in the program. 2231 if (!lType->isFloatingType()) { 2232 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2233 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2234 if (DRL->getDecl() == DRR->getDecl()) 2235 Diag(loc, diag::warn_selfcomparison); 2236 } 2237 2238 // Check for comparisons of floating point operands using != and ==. 2239 if (!isRelational && lType->isFloatingType()) { 2240 assert (rType->isFloatingType()); 2241 CheckFloatComparison(loc,lex,rex); 2242 } 2243 2244 // Return the type for the comparison, which is the same as vector type for 2245 // integer vectors, or an integer type of identical size and number of 2246 // elements for floating point vectors. 2247 if (lType->isIntegerType()) 2248 return lType; 2249 2250 const VectorType *VTy = lType->getAsVectorType(); 2251 2252 // FIXME: need to deal with non-32b int / non-64b long long 2253 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2254 if (TypeSize == 32) { 2255 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2256 } 2257 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2258 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2259} 2260 2261inline QualType Sema::CheckBitwiseOperands( 2262 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 2263{ 2264 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2265 return CheckVectorOperands(loc, lex, rex); 2266 2267 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2268 2269 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2270 return compType; 2271 return InvalidOperands(loc, lex, rex); 2272} 2273 2274inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2275 Expr *&lex, Expr *&rex, SourceLocation loc) 2276{ 2277 UsualUnaryConversions(lex); 2278 UsualUnaryConversions(rex); 2279 2280 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2281 return Context.IntTy; 2282 return InvalidOperands(loc, lex, rex); 2283} 2284 2285inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 2286 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 2287{ 2288 QualType lhsType = lex->getType(); 2289 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 2290 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(Context); 2291 2292 switch (mlval) { // C99 6.5.16p2 2293 case Expr::MLV_Valid: 2294 break; 2295 case Expr::MLV_ConstQualified: 2296 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 2297 return QualType(); 2298 case Expr::MLV_ArrayType: 2299 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 2300 lhsType.getAsString(), lex->getSourceRange()); 2301 return QualType(); 2302 case Expr::MLV_NotObjectType: 2303 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 2304 lhsType.getAsString(), lex->getSourceRange()); 2305 return QualType(); 2306 case Expr::MLV_InvalidExpression: 2307 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 2308 lex->getSourceRange()); 2309 return QualType(); 2310 case Expr::MLV_IncompleteType: 2311 case Expr::MLV_IncompleteVoidType: 2312 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 2313 lhsType.getAsString(), lex->getSourceRange()); 2314 return QualType(); 2315 case Expr::MLV_DuplicateVectorComponents: 2316 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 2317 lex->getSourceRange()); 2318 return QualType(); 2319 case Expr::MLV_NotBlockQualified: 2320 Diag(loc, diag::err_block_decl_ref_not_modifiable_lvalue, 2321 lex->getSourceRange()); 2322 return QualType(); 2323 } 2324 2325 AssignConvertType ConvTy; 2326 if (compoundType.isNull()) { 2327 // Simple assignment "x = y". 2328 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 2329 2330 // If the RHS is a unary plus or minus, check to see if they = and + are 2331 // right next to each other. If so, the user may have typo'd "x =+ 4" 2332 // instead of "x += 4". 2333 Expr *RHSCheck = rex; 2334 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2335 RHSCheck = ICE->getSubExpr(); 2336 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2337 if ((UO->getOpcode() == UnaryOperator::Plus || 2338 UO->getOpcode() == UnaryOperator::Minus) && 2339 loc.isFileID() && UO->getOperatorLoc().isFileID() && 2340 // Only if the two operators are exactly adjacent. 2341 loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2342 Diag(loc, diag::warn_not_compound_assign, 2343 UO->getOpcode() == UnaryOperator::Plus ? "+" : "-", 2344 SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc())); 2345 } 2346 } else { 2347 // Compound assignment "x += y" 2348 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 2349 } 2350 2351 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 2352 rex, "assigning")) 2353 return QualType(); 2354 2355 // C99 6.5.16p3: The type of an assignment expression is the type of the 2356 // left operand unless the left operand has qualified type, in which case 2357 // it is the unqualified version of the type of the left operand. 2358 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2359 // is converted to the type of the assignment expression (above). 2360 // C++ 5.17p1: the type of the assignment expression is that of its left 2361 // oprdu. 2362 return lhsType.getUnqualifiedType(); 2363} 2364 2365inline QualType Sema::CheckCommaOperands( // C99 6.5.17 2366 Expr *&lex, Expr *&rex, SourceLocation loc) { 2367 2368 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2369 DefaultFunctionArrayConversion(rex); 2370 return rex->getType(); 2371} 2372 2373/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2374/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2375QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 2376 QualType resType = op->getType(); 2377 assert(!resType.isNull() && "no type for increment/decrement expression"); 2378 2379 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2380 if (const PointerType *pt = resType->getAsPointerType()) { 2381 if (pt->getPointeeType()->isVoidType()) { 2382 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 2383 } else if (!pt->getPointeeType()->isObjectType()) { 2384 // C99 6.5.2.4p2, 6.5.6p2 2385 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 2386 resType.getAsString(), op->getSourceRange()); 2387 return QualType(); 2388 } 2389 } else if (!resType->isRealType()) { 2390 if (resType->isComplexType()) 2391 // C99 does not support ++/-- on complex types. 2392 Diag(OpLoc, diag::ext_integer_increment_complex, 2393 resType.getAsString(), op->getSourceRange()); 2394 else { 2395 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 2396 resType.getAsString(), op->getSourceRange()); 2397 return QualType(); 2398 } 2399 } 2400 // At this point, we know we have a real, complex or pointer type. 2401 // Now make sure the operand is a modifiable lvalue. 2402 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(Context); 2403 if (mlval != Expr::MLV_Valid) { 2404 // FIXME: emit a more precise diagnostic... 2405 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 2406 op->getSourceRange()); 2407 return QualType(); 2408 } 2409 return resType; 2410} 2411 2412/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2413/// This routine allows us to typecheck complex/recursive expressions 2414/// where the declaration is needed for type checking. We only need to 2415/// handle cases when the expression references a function designator 2416/// or is an lvalue. Here are some examples: 2417/// - &(x) => x 2418/// - &*****f => f for f a function designator. 2419/// - &s.xx => s 2420/// - &s.zz[1].yy -> s, if zz is an array 2421/// - *(x + 1) -> x, if x is an array 2422/// - &"123"[2] -> 0 2423/// - & __real__ x -> x 2424static NamedDecl *getPrimaryDecl(Expr *E) { 2425 switch (E->getStmtClass()) { 2426 case Stmt::DeclRefExprClass: 2427 return cast<DeclRefExpr>(E)->getDecl(); 2428 case Stmt::MemberExprClass: 2429 // Fields cannot be declared with a 'register' storage class. 2430 // &X->f is always ok, even if X is declared register. 2431 if (cast<MemberExpr>(E)->isArrow()) 2432 return 0; 2433 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2434 case Stmt::ArraySubscriptExprClass: { 2435 // &X[4] and &4[X] refers to X if X is not a pointer. 2436 2437 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2438 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 2439 if (!VD || VD->getType()->isPointerType()) 2440 return 0; 2441 else 2442 return VD; 2443 } 2444 case Stmt::UnaryOperatorClass: { 2445 UnaryOperator *UO = cast<UnaryOperator>(E); 2446 2447 switch(UO->getOpcode()) { 2448 case UnaryOperator::Deref: { 2449 // *(X + 1) refers to X if X is not a pointer. 2450 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 2451 ValueDecl *VD = dyn_cast<ValueDecl>(D); 2452 if (!VD || VD->getType()->isPointerType()) 2453 return 0; 2454 return VD; 2455 } 2456 return 0; 2457 } 2458 case UnaryOperator::Real: 2459 case UnaryOperator::Imag: 2460 case UnaryOperator::Extension: 2461 return getPrimaryDecl(UO->getSubExpr()); 2462 default: 2463 return 0; 2464 } 2465 } 2466 case Stmt::BinaryOperatorClass: { 2467 BinaryOperator *BO = cast<BinaryOperator>(E); 2468 2469 // Handle cases involving pointer arithmetic. The result of an 2470 // Assign or AddAssign is not an lvalue so they can be ignored. 2471 2472 // (x + n) or (n + x) => x 2473 if (BO->getOpcode() == BinaryOperator::Add) { 2474 if (BO->getLHS()->getType()->isPointerType()) { 2475 return getPrimaryDecl(BO->getLHS()); 2476 } else if (BO->getRHS()->getType()->isPointerType()) { 2477 return getPrimaryDecl(BO->getRHS()); 2478 } 2479 } 2480 2481 return 0; 2482 } 2483 case Stmt::ParenExprClass: 2484 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2485 case Stmt::ImplicitCastExprClass: 2486 // &X[4] when X is an array, has an implicit cast from array to pointer. 2487 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2488 default: 2489 return 0; 2490 } 2491} 2492 2493/// CheckAddressOfOperand - The operand of & must be either a function 2494/// designator or an lvalue designating an object. If it is an lvalue, the 2495/// object cannot be declared with storage class register or be a bit field. 2496/// Note: The usual conversions are *not* applied to the operand of the & 2497/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2498QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2499 if (getLangOptions().C99) { 2500 // Implement C99-only parts of addressof rules. 2501 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2502 if (uOp->getOpcode() == UnaryOperator::Deref) 2503 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2504 // (assuming the deref expression is valid). 2505 return uOp->getSubExpr()->getType(); 2506 } 2507 // Technically, there should be a check for array subscript 2508 // expressions here, but the result of one is always an lvalue anyway. 2509 } 2510 NamedDecl *dcl = getPrimaryDecl(op); 2511 Expr::isLvalueResult lval = op->isLvalue(Context); 2512 2513 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2514 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2515 // FIXME: emit more specific diag... 2516 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 2517 op->getSourceRange()); 2518 return QualType(); 2519 } 2520 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2521 if (MemExpr->getMemberDecl()->isBitField()) { 2522 Diag(OpLoc, diag::err_typecheck_address_of, 2523 std::string("bit-field"), op->getSourceRange()); 2524 return QualType(); 2525 } 2526 // Check for Apple extension for accessing vector components. 2527 } else if (isa<ArraySubscriptExpr>(op) && 2528 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2529 Diag(OpLoc, diag::err_typecheck_address_of, 2530 std::string("vector"), op->getSourceRange()); 2531 return QualType(); 2532 } else if (dcl) { // C99 6.5.3.2p1 2533 // We have an lvalue with a decl. Make sure the decl is not declared 2534 // with the register storage-class specifier. 2535 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2536 if (vd->getStorageClass() == VarDecl::Register) { 2537 Diag(OpLoc, diag::err_typecheck_address_of, 2538 std::string("register variable"), op->getSourceRange()); 2539 return QualType(); 2540 } 2541 } else 2542 assert(0 && "Unknown/unexpected decl type"); 2543 } 2544 2545 // If the operand has type "type", the result has type "pointer to type". 2546 return Context.getPointerType(op->getType()); 2547} 2548 2549QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 2550 UsualUnaryConversions(op); 2551 QualType qType = op->getType(); 2552 2553 if (const PointerType *PT = qType->getAsPointerType()) { 2554 // Note that per both C89 and C99, this is always legal, even 2555 // if ptype is an incomplete type or void. 2556 // It would be possible to warn about dereferencing a 2557 // void pointer, but it's completely well-defined, 2558 // and such a warning is unlikely to catch any mistakes. 2559 return PT->getPointeeType(); 2560 } 2561 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 2562 qType.getAsString(), op->getSourceRange()); 2563 return QualType(); 2564} 2565 2566static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2567 tok::TokenKind Kind) { 2568 BinaryOperator::Opcode Opc; 2569 switch (Kind) { 2570 default: assert(0 && "Unknown binop!"); 2571 case tok::star: Opc = BinaryOperator::Mul; break; 2572 case tok::slash: Opc = BinaryOperator::Div; break; 2573 case tok::percent: Opc = BinaryOperator::Rem; break; 2574 case tok::plus: Opc = BinaryOperator::Add; break; 2575 case tok::minus: Opc = BinaryOperator::Sub; break; 2576 case tok::lessless: Opc = BinaryOperator::Shl; break; 2577 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2578 case tok::lessequal: Opc = BinaryOperator::LE; break; 2579 case tok::less: Opc = BinaryOperator::LT; break; 2580 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2581 case tok::greater: Opc = BinaryOperator::GT; break; 2582 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2583 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2584 case tok::amp: Opc = BinaryOperator::And; break; 2585 case tok::caret: Opc = BinaryOperator::Xor; break; 2586 case tok::pipe: Opc = BinaryOperator::Or; break; 2587 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2588 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2589 case tok::equal: Opc = BinaryOperator::Assign; break; 2590 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2591 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2592 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2593 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2594 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2595 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2596 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2597 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2598 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2599 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2600 case tok::comma: Opc = BinaryOperator::Comma; break; 2601 } 2602 return Opc; 2603} 2604 2605static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2606 tok::TokenKind Kind) { 2607 UnaryOperator::Opcode Opc; 2608 switch (Kind) { 2609 default: assert(0 && "Unknown unary op!"); 2610 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2611 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2612 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2613 case tok::star: Opc = UnaryOperator::Deref; break; 2614 case tok::plus: Opc = UnaryOperator::Plus; break; 2615 case tok::minus: Opc = UnaryOperator::Minus; break; 2616 case tok::tilde: Opc = UnaryOperator::Not; break; 2617 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2618 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 2619 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 2620 case tok::kw___real: Opc = UnaryOperator::Real; break; 2621 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2622 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2623 } 2624 return Opc; 2625} 2626 2627// Binary Operators. 'Tok' is the token for the operator. 2628Action::ExprResult Sema::ActOnBinOp(SourceLocation TokLoc, tok::TokenKind Kind, 2629 ExprTy *LHS, ExprTy *RHS) { 2630 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 2631 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 2632 2633 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 2634 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 2635 2636 QualType ResultTy; // Result type of the binary operator. 2637 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2638 2639 switch (Opc) { 2640 default: 2641 assert(0 && "Unknown binary expr!"); 2642 case BinaryOperator::Assign: 2643 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, QualType()); 2644 break; 2645 case BinaryOperator::Mul: 2646 case BinaryOperator::Div: 2647 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc); 2648 break; 2649 case BinaryOperator::Rem: 2650 ResultTy = CheckRemainderOperands(lhs, rhs, TokLoc); 2651 break; 2652 case BinaryOperator::Add: 2653 ResultTy = CheckAdditionOperands(lhs, rhs, TokLoc); 2654 break; 2655 case BinaryOperator::Sub: 2656 ResultTy = CheckSubtractionOperands(lhs, rhs, TokLoc); 2657 break; 2658 case BinaryOperator::Shl: 2659 case BinaryOperator::Shr: 2660 ResultTy = CheckShiftOperands(lhs, rhs, TokLoc); 2661 break; 2662 case BinaryOperator::LE: 2663 case BinaryOperator::LT: 2664 case BinaryOperator::GE: 2665 case BinaryOperator::GT: 2666 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, true); 2667 break; 2668 case BinaryOperator::EQ: 2669 case BinaryOperator::NE: 2670 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, false); 2671 break; 2672 case BinaryOperator::And: 2673 case BinaryOperator::Xor: 2674 case BinaryOperator::Or: 2675 ResultTy = CheckBitwiseOperands(lhs, rhs, TokLoc); 2676 break; 2677 case BinaryOperator::LAnd: 2678 case BinaryOperator::LOr: 2679 ResultTy = CheckLogicalOperands(lhs, rhs, TokLoc); 2680 break; 2681 case BinaryOperator::MulAssign: 2682 case BinaryOperator::DivAssign: 2683 CompTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc, true); 2684 if (!CompTy.isNull()) 2685 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2686 break; 2687 case BinaryOperator::RemAssign: 2688 CompTy = CheckRemainderOperands(lhs, rhs, TokLoc, true); 2689 if (!CompTy.isNull()) 2690 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2691 break; 2692 case BinaryOperator::AddAssign: 2693 CompTy = CheckAdditionOperands(lhs, rhs, TokLoc, true); 2694 if (!CompTy.isNull()) 2695 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2696 break; 2697 case BinaryOperator::SubAssign: 2698 CompTy = CheckSubtractionOperands(lhs, rhs, TokLoc, true); 2699 if (!CompTy.isNull()) 2700 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2701 break; 2702 case BinaryOperator::ShlAssign: 2703 case BinaryOperator::ShrAssign: 2704 CompTy = CheckShiftOperands(lhs, rhs, TokLoc, true); 2705 if (!CompTy.isNull()) 2706 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2707 break; 2708 case BinaryOperator::AndAssign: 2709 case BinaryOperator::XorAssign: 2710 case BinaryOperator::OrAssign: 2711 CompTy = CheckBitwiseOperands(lhs, rhs, TokLoc, true); 2712 if (!CompTy.isNull()) 2713 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2714 break; 2715 case BinaryOperator::Comma: 2716 ResultTy = CheckCommaOperands(lhs, rhs, TokLoc); 2717 break; 2718 } 2719 if (ResultTy.isNull()) 2720 return true; 2721 if (CompTy.isNull()) 2722 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 2723 else 2724 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, TokLoc); 2725} 2726 2727// Unary Operators. 'Tok' is the token for the operator. 2728Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2729 ExprTy *input) { 2730 Expr *Input = (Expr*)input; 2731 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2732 QualType resultType; 2733 switch (Opc) { 2734 default: 2735 assert(0 && "Unimplemented unary expr!"); 2736 case UnaryOperator::PreInc: 2737 case UnaryOperator::PreDec: 2738 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2739 break; 2740 case UnaryOperator::AddrOf: 2741 resultType = CheckAddressOfOperand(Input, OpLoc); 2742 break; 2743 case UnaryOperator::Deref: 2744 DefaultFunctionArrayConversion(Input); 2745 resultType = CheckIndirectionOperand(Input, OpLoc); 2746 break; 2747 case UnaryOperator::Plus: 2748 case UnaryOperator::Minus: 2749 UsualUnaryConversions(Input); 2750 resultType = Input->getType(); 2751 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2752 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2753 resultType.getAsString()); 2754 break; 2755 case UnaryOperator::Not: // bitwise complement 2756 UsualUnaryConversions(Input); 2757 resultType = Input->getType(); 2758 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 2759 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 2760 // C99 does not support '~' for complex conjugation. 2761 Diag(OpLoc, diag::ext_integer_complement_complex, 2762 resultType.getAsString(), Input->getSourceRange()); 2763 else if (!resultType->isIntegerType()) 2764 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2765 resultType.getAsString(), Input->getSourceRange()); 2766 break; 2767 case UnaryOperator::LNot: // logical negation 2768 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2769 DefaultFunctionArrayConversion(Input); 2770 resultType = Input->getType(); 2771 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2772 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2773 resultType.getAsString()); 2774 // LNot always has type int. C99 6.5.3.3p5. 2775 resultType = Context.IntTy; 2776 break; 2777 case UnaryOperator::SizeOf: 2778 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2779 Input->getSourceRange(), true); 2780 break; 2781 case UnaryOperator::AlignOf: 2782 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2783 Input->getSourceRange(), false); 2784 break; 2785 case UnaryOperator::Real: 2786 case UnaryOperator::Imag: 2787 resultType = CheckRealImagOperand(Input, OpLoc); 2788 break; 2789 case UnaryOperator::Extension: 2790 resultType = Input->getType(); 2791 break; 2792 } 2793 if (resultType.isNull()) 2794 return true; 2795 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2796} 2797 2798/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2799Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2800 SourceLocation LabLoc, 2801 IdentifierInfo *LabelII) { 2802 // Look up the record for this label identifier. 2803 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2804 2805 // If we haven't seen this label yet, create a forward reference. It 2806 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 2807 if (LabelDecl == 0) 2808 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2809 2810 // Create the AST node. The address of a label always has type 'void*'. 2811 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2812 Context.getPointerType(Context.VoidTy)); 2813} 2814 2815Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2816 SourceLocation RPLoc) { // "({..})" 2817 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2818 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2819 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2820 2821 // FIXME: there are a variety of strange constraints to enforce here, for 2822 // example, it is not possible to goto into a stmt expression apparently. 2823 // More semantic analysis is needed. 2824 2825 // FIXME: the last statement in the compount stmt has its value used. We 2826 // should not warn about it being unused. 2827 2828 // If there are sub stmts in the compound stmt, take the type of the last one 2829 // as the type of the stmtexpr. 2830 QualType Ty = Context.VoidTy; 2831 2832 if (!Compound->body_empty()) { 2833 Stmt *LastStmt = Compound->body_back(); 2834 // If LastStmt is a label, skip down through into the body. 2835 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 2836 LastStmt = Label->getSubStmt(); 2837 2838 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 2839 Ty = LastExpr->getType(); 2840 } 2841 2842 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2843} 2844 2845Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2846 SourceLocation TypeLoc, 2847 TypeTy *argty, 2848 OffsetOfComponent *CompPtr, 2849 unsigned NumComponents, 2850 SourceLocation RPLoc) { 2851 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2852 assert(!ArgTy.isNull() && "Missing type argument!"); 2853 2854 // We must have at least one component that refers to the type, and the first 2855 // one is known to be a field designator. Verify that the ArgTy represents 2856 // a struct/union/class. 2857 if (!ArgTy->isRecordType()) 2858 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2859 2860 // Otherwise, create a compound literal expression as the base, and 2861 // iteratively process the offsetof designators. 2862 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2863 2864 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2865 // GCC extension, diagnose them. 2866 if (NumComponents != 1) 2867 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2868 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2869 2870 for (unsigned i = 0; i != NumComponents; ++i) { 2871 const OffsetOfComponent &OC = CompPtr[i]; 2872 if (OC.isBrackets) { 2873 // Offset of an array sub-field. TODO: Should we allow vector elements? 2874 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 2875 if (!AT) { 2876 delete Res; 2877 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 2878 Res->getType().getAsString()); 2879 } 2880 2881 // FIXME: C++: Verify that operator[] isn't overloaded. 2882 2883 // C99 6.5.2.1p1 2884 Expr *Idx = static_cast<Expr*>(OC.U.E); 2885 if (!Idx->getType()->isIntegerType()) 2886 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 2887 Idx->getSourceRange()); 2888 2889 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 2890 continue; 2891 } 2892 2893 const RecordType *RC = Res->getType()->getAsRecordType(); 2894 if (!RC) { 2895 delete Res; 2896 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 2897 Res->getType().getAsString()); 2898 } 2899 2900 // Get the decl corresponding to this. 2901 RecordDecl *RD = RC->getDecl(); 2902 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 2903 if (!MemberDecl) 2904 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 2905 OC.U.IdentInfo->getName(), 2906 SourceRange(OC.LocStart, OC.LocEnd)); 2907 2908 // FIXME: C++: Verify that MemberDecl isn't a static field. 2909 // FIXME: Verify that MemberDecl isn't a bitfield. 2910 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 2911 // matter here. 2912 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, MemberDecl->getType()); 2913 } 2914 2915 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 2916 BuiltinLoc); 2917} 2918 2919 2920Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 2921 TypeTy *arg1, TypeTy *arg2, 2922 SourceLocation RPLoc) { 2923 QualType argT1 = QualType::getFromOpaquePtr(arg1); 2924 QualType argT2 = QualType::getFromOpaquePtr(arg2); 2925 2926 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 2927 2928 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 2929} 2930 2931Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 2932 ExprTy *expr1, ExprTy *expr2, 2933 SourceLocation RPLoc) { 2934 Expr *CondExpr = static_cast<Expr*>(cond); 2935 Expr *LHSExpr = static_cast<Expr*>(expr1); 2936 Expr *RHSExpr = static_cast<Expr*>(expr2); 2937 2938 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 2939 2940 // The conditional expression is required to be a constant expression. 2941 llvm::APSInt condEval(32); 2942 SourceLocation ExpLoc; 2943 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 2944 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 2945 CondExpr->getSourceRange()); 2946 2947 // If the condition is > zero, then the AST type is the same as the LSHExpr. 2948 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 2949 RHSExpr->getType(); 2950 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 2951} 2952 2953//===----------------------------------------------------------------------===// 2954// Clang Extensions. 2955//===----------------------------------------------------------------------===// 2956 2957/// ActOnBlockStart - This callback is invoked when a block literal is started. 2958void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 2959 // Analyze block parameters. 2960 BlockSemaInfo *BSI = new BlockSemaInfo(); 2961 2962 // Add BSI to CurBlock. 2963 BSI->PrevBlockInfo = CurBlock; 2964 CurBlock = BSI; 2965 2966 BSI->ReturnType = 0; 2967 BSI->TheScope = BlockScope; 2968 2969 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 2970 PushDeclContext(BSI->TheDecl); 2971} 2972 2973void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 2974 // Analyze arguments to block. 2975 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 2976 "Not a function declarator!"); 2977 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 2978 2979 CurBlock->hasPrototype = FTI.hasPrototype; 2980 CurBlock->isVariadic = true; 2981 2982 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 2983 // no arguments, not a function that takes a single void argument. 2984 if (FTI.hasPrototype && 2985 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2986 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 2987 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 2988 // empty arg list, don't push any params. 2989 CurBlock->isVariadic = false; 2990 } else if (FTI.hasPrototype) { 2991 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 2992 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 2993 CurBlock->isVariadic = FTI.isVariadic; 2994 } 2995 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 2996 2997 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 2998 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 2999 // If this has an identifier, add it to the scope stack. 3000 if ((*AI)->getIdentifier()) 3001 PushOnScopeChains(*AI, CurBlock->TheScope); 3002} 3003 3004/// ActOnBlockError - If there is an error parsing a block, this callback 3005/// is invoked to pop the information about the block from the action impl. 3006void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 3007 // Ensure that CurBlock is deleted. 3008 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 3009 3010 // Pop off CurBlock, handle nested blocks. 3011 CurBlock = CurBlock->PrevBlockInfo; 3012 3013 // FIXME: Delete the ParmVarDecl objects as well??? 3014 3015} 3016 3017/// ActOnBlockStmtExpr - This is called when the body of a block statement 3018/// literal was successfully completed. ^(int x){...} 3019Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 3020 Scope *CurScope) { 3021 // Ensure that CurBlock is deleted. 3022 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 3023 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 3024 3025 PopDeclContext(); 3026 3027 // Pop off CurBlock, handle nested blocks. 3028 CurBlock = CurBlock->PrevBlockInfo; 3029 3030 QualType RetTy = Context.VoidTy; 3031 if (BSI->ReturnType) 3032 RetTy = QualType(BSI->ReturnType, 0); 3033 3034 llvm::SmallVector<QualType, 8> ArgTypes; 3035 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 3036 ArgTypes.push_back(BSI->Params[i]->getType()); 3037 3038 QualType BlockTy; 3039 if (!BSI->hasPrototype) 3040 BlockTy = Context.getFunctionTypeNoProto(RetTy); 3041 else 3042 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 3043 BSI->isVariadic, 0); 3044 3045 BlockTy = Context.getBlockPointerType(BlockTy); 3046 3047 BSI->TheDecl->setBody(Body.take()); 3048 return new BlockExpr(BSI->TheDecl, BlockTy); 3049} 3050 3051/// ExprsMatchFnType - return true if the Exprs in array Args have 3052/// QualTypes that match the QualTypes of the arguments of the FnType. 3053/// The number of arguments has already been validated to match the number of 3054/// arguments in FnType. 3055static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 3056 ASTContext &Context) { 3057 unsigned NumParams = FnType->getNumArgs(); 3058 for (unsigned i = 0; i != NumParams; ++i) { 3059 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 3060 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 3061 3062 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 3063 return false; 3064 } 3065 return true; 3066} 3067 3068Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 3069 SourceLocation *CommaLocs, 3070 SourceLocation BuiltinLoc, 3071 SourceLocation RParenLoc) { 3072 // __builtin_overload requires at least 2 arguments 3073 if (NumArgs < 2) 3074 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3075 SourceRange(BuiltinLoc, RParenLoc)); 3076 3077 // The first argument is required to be a constant expression. It tells us 3078 // the number of arguments to pass to each of the functions to be overloaded. 3079 Expr **Args = reinterpret_cast<Expr**>(args); 3080 Expr *NParamsExpr = Args[0]; 3081 llvm::APSInt constEval(32); 3082 SourceLocation ExpLoc; 3083 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 3084 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3085 NParamsExpr->getSourceRange()); 3086 3087 // Verify that the number of parameters is > 0 3088 unsigned NumParams = constEval.getZExtValue(); 3089 if (NumParams == 0) 3090 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3091 NParamsExpr->getSourceRange()); 3092 // Verify that we have at least 1 + NumParams arguments to the builtin. 3093 if ((NumParams + 1) > NumArgs) 3094 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3095 SourceRange(BuiltinLoc, RParenLoc)); 3096 3097 // Figure out the return type, by matching the args to one of the functions 3098 // listed after the parameters. 3099 OverloadExpr *OE = 0; 3100 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 3101 // UsualUnaryConversions will convert the function DeclRefExpr into a 3102 // pointer to function. 3103 Expr *Fn = UsualUnaryConversions(Args[i]); 3104 const FunctionTypeProto *FnType = 0; 3105 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3106 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3107 3108 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3109 // parameters, and the number of parameters must match the value passed to 3110 // the builtin. 3111 if (!FnType || (FnType->getNumArgs() != NumParams)) 3112 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 3113 Fn->getSourceRange()); 3114 3115 // Scan the parameter list for the FunctionType, checking the QualType of 3116 // each parameter against the QualTypes of the arguments to the builtin. 3117 // If they match, return a new OverloadExpr. 3118 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3119 if (OE) 3120 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 3121 OE->getFn()->getSourceRange()); 3122 // Remember our match, and continue processing the remaining arguments 3123 // to catch any errors. 3124 OE = new OverloadExpr(Args, NumArgs, i, FnType->getResultType(), 3125 BuiltinLoc, RParenLoc); 3126 } 3127 } 3128 // Return the newly created OverloadExpr node, if we succeded in matching 3129 // exactly one of the candidate functions. 3130 if (OE) 3131 return OE; 3132 3133 // If we didn't find a matching function Expr in the __builtin_overload list 3134 // the return an error. 3135 std::string typeNames; 3136 for (unsigned i = 0; i != NumParams; ++i) { 3137 if (i != 0) typeNames += ", "; 3138 typeNames += Args[i+1]->getType().getAsString(); 3139 } 3140 3141 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 3142 SourceRange(BuiltinLoc, RParenLoc)); 3143} 3144 3145Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3146 ExprTy *expr, TypeTy *type, 3147 SourceLocation RPLoc) { 3148 Expr *E = static_cast<Expr*>(expr); 3149 QualType T = QualType::getFromOpaquePtr(type); 3150 3151 InitBuiltinVaListType(); 3152 3153 // Get the va_list type 3154 QualType VaListType = Context.getBuiltinVaListType(); 3155 // Deal with implicit array decay; for example, on x86-64, 3156 // va_list is an array, but it's supposed to decay to 3157 // a pointer for va_arg. 3158 if (VaListType->isArrayType()) 3159 VaListType = Context.getArrayDecayedType(VaListType); 3160 // Make sure the input expression also decays appropriately. 3161 UsualUnaryConversions(E); 3162 3163 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3164 return Diag(E->getLocStart(), 3165 diag::err_first_argument_to_va_arg_not_of_type_va_list, 3166 E->getType().getAsString(), 3167 E->getSourceRange()); 3168 3169 // FIXME: Warn if a non-POD type is passed in. 3170 3171 return new VAArgExpr(BuiltinLoc, E, T, RPLoc); 3172} 3173 3174bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3175 SourceLocation Loc, 3176 QualType DstType, QualType SrcType, 3177 Expr *SrcExpr, const char *Flavor) { 3178 // Decode the result (notice that AST's are still created for extensions). 3179 bool isInvalid = false; 3180 unsigned DiagKind; 3181 switch (ConvTy) { 3182 default: assert(0 && "Unknown conversion type"); 3183 case Compatible: return false; 3184 case PointerToInt: 3185 DiagKind = diag::ext_typecheck_convert_pointer_int; 3186 break; 3187 case IntToPointer: 3188 DiagKind = diag::ext_typecheck_convert_int_pointer; 3189 break; 3190 case IncompatiblePointer: 3191 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3192 break; 3193 case FunctionVoidPointer: 3194 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3195 break; 3196 case CompatiblePointerDiscardsQualifiers: 3197 // If the qualifiers lost were because we were applying the 3198 // (deprecated) C++ conversion from a string literal to a char* 3199 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3200 // Ideally, this check would be performed in 3201 // CheckPointerTypesForAssignment. However, that would require a 3202 // bit of refactoring (so that the second argument is an 3203 // expression, rather than a type), which should be done as part 3204 // of a larger effort to fix CheckPointerTypesForAssignment for 3205 // C++ semantics. 3206 if (getLangOptions().CPlusPlus && 3207 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3208 return false; 3209 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3210 break; 3211 case IntToBlockPointer: 3212 DiagKind = diag::err_int_to_block_pointer; 3213 break; 3214 case IncompatibleBlockPointer: 3215 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3216 break; 3217 case BlockVoidPointer: 3218 DiagKind = diag::ext_typecheck_convert_pointer_void_block; 3219 break; 3220 case IncompatibleObjCQualifiedId: 3221 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3222 // it can give a more specific diagnostic. 3223 DiagKind = diag::warn_incompatible_qualified_id; 3224 break; 3225 case Incompatible: 3226 DiagKind = diag::err_typecheck_convert_incompatible; 3227 isInvalid = true; 3228 break; 3229 } 3230 3231 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 3232 SrcExpr->getSourceRange()); 3233 return isInvalid; 3234} 3235