SemaExpr.cpp revision 94b1dd2368dc9eeedf2794db654deae225fac763
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprCXX.h" 18#include "clang/AST/ExprObjC.h" 19#include "clang/Lex/Preprocessor.h" 20#include "clang/Lex/LiteralSupport.h" 21#include "clang/Basic/Diagnostic.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/Scope.h" 26using namespace clang; 27 28//===----------------------------------------------------------------------===// 29// Standard Promotions and Conversions 30//===----------------------------------------------------------------------===// 31 32/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 33void Sema::DefaultFunctionArrayConversion(Expr *&E) { 34 QualType Ty = E->getType(); 35 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 36 37 if (const ReferenceType *ref = Ty->getAsReferenceType()) { 38 ImpCastExprToType(E, ref->getPointeeType()); // C++ [expr] 39 Ty = E->getType(); 40 } 41 if (Ty->isFunctionType()) 42 ImpCastExprToType(E, Context.getPointerType(Ty)); 43 else if (Ty->isArrayType()) { 44 // In C90 mode, arrays only promote to pointers if the array expression is 45 // an lvalue. The relevant legalese is C90 6.2.2.1p3: "an lvalue that has 46 // type 'array of type' is converted to an expression that has type 'pointer 47 // to type'...". In C99 this was changed to: C99 6.3.2.1p3: "an expression 48 // that has type 'array of type' ...". The relevant change is "an lvalue" 49 // (C90) to "an expression" (C99). 50 // 51 // C++ 4.2p1: 52 // An lvalue or rvalue of type "array of N T" or "array of unknown bound of 53 // T" can be converted to an rvalue of type "pointer to T". 54 // 55 if (getLangOptions().C99 || getLangOptions().CPlusPlus || 56 E->isLvalue(Context) == Expr::LV_Valid) 57 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 58 } 59} 60 61/// UsualUnaryConversions - Performs various conversions that are common to most 62/// operators (C99 6.3). The conversions of array and function types are 63/// sometimes surpressed. For example, the array->pointer conversion doesn't 64/// apply if the array is an argument to the sizeof or address (&) operators. 65/// In these instances, this routine should *not* be called. 66Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 67 QualType Ty = Expr->getType(); 68 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 69 70 if (const ReferenceType *Ref = Ty->getAsReferenceType()) { 71 ImpCastExprToType(Expr, Ref->getPointeeType()); // C++ [expr] 72 Ty = Expr->getType(); 73 } 74 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 75 ImpCastExprToType(Expr, Context.IntTy); 76 else 77 DefaultFunctionArrayConversion(Expr); 78 79 return Expr; 80} 81 82/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 83/// do not have a prototype. Arguments that have type float are promoted to 84/// double. All other argument types are converted by UsualUnaryConversions(). 85void Sema::DefaultArgumentPromotion(Expr *&Expr) { 86 QualType Ty = Expr->getType(); 87 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 88 89 // If this is a 'float' (CVR qualified or typedef) promote to double. 90 if (const BuiltinType *BT = Ty->getAsBuiltinType()) 91 if (BT->getKind() == BuiltinType::Float) 92 return ImpCastExprToType(Expr, Context.DoubleTy); 93 94 UsualUnaryConversions(Expr); 95} 96 97/// UsualArithmeticConversions - Performs various conversions that are common to 98/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 99/// routine returns the first non-arithmetic type found. The client is 100/// responsible for emitting appropriate error diagnostics. 101/// FIXME: verify the conversion rules for "complex int" are consistent with 102/// GCC. 103QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 104 bool isCompAssign) { 105 if (!isCompAssign) { 106 UsualUnaryConversions(lhsExpr); 107 UsualUnaryConversions(rhsExpr); 108 } 109 // For conversion purposes, we ignore any qualifiers. 110 // For example, "const float" and "float" are equivalent. 111 QualType lhs = 112 Context.getCanonicalType(lhsExpr->getType()).getUnqualifiedType(); 113 QualType rhs = 114 Context.getCanonicalType(rhsExpr->getType()).getUnqualifiedType(); 115 116 // If both types are identical, no conversion is needed. 117 if (lhs == rhs) 118 return lhs; 119 120 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 121 // The caller can deal with this (e.g. pointer + int). 122 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 123 return lhs; 124 125 // At this point, we have two different arithmetic types. 126 127 // Handle complex types first (C99 6.3.1.8p1). 128 if (lhs->isComplexType() || rhs->isComplexType()) { 129 // if we have an integer operand, the result is the complex type. 130 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 131 // convert the rhs to the lhs complex type. 132 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 133 return lhs; 134 } 135 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 136 // convert the lhs to the rhs complex type. 137 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 138 return rhs; 139 } 140 // This handles complex/complex, complex/float, or float/complex. 141 // When both operands are complex, the shorter operand is converted to the 142 // type of the longer, and that is the type of the result. This corresponds 143 // to what is done when combining two real floating-point operands. 144 // The fun begins when size promotion occur across type domains. 145 // From H&S 6.3.4: When one operand is complex and the other is a real 146 // floating-point type, the less precise type is converted, within it's 147 // real or complex domain, to the precision of the other type. For example, 148 // when combining a "long double" with a "double _Complex", the 149 // "double _Complex" is promoted to "long double _Complex". 150 int result = Context.getFloatingTypeOrder(lhs, rhs); 151 152 if (result > 0) { // The left side is bigger, convert rhs. 153 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 154 if (!isCompAssign) 155 ImpCastExprToType(rhsExpr, rhs); 156 } else if (result < 0) { // The right side is bigger, convert lhs. 157 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 158 if (!isCompAssign) 159 ImpCastExprToType(lhsExpr, lhs); 160 } 161 // At this point, lhs and rhs have the same rank/size. Now, make sure the 162 // domains match. This is a requirement for our implementation, C99 163 // does not require this promotion. 164 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 165 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 166 if (!isCompAssign) 167 ImpCastExprToType(lhsExpr, rhs); 168 return rhs; 169 } else { // handle "_Complex double, double". 170 if (!isCompAssign) 171 ImpCastExprToType(rhsExpr, lhs); 172 return lhs; 173 } 174 } 175 return lhs; // The domain/size match exactly. 176 } 177 // Now handle "real" floating types (i.e. float, double, long double). 178 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 179 // if we have an integer operand, the result is the real floating type. 180 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 181 // convert rhs to the lhs floating point type. 182 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 183 return lhs; 184 } 185 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 186 // convert lhs to the rhs floating point type. 187 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 188 return rhs; 189 } 190 // We have two real floating types, float/complex combos were handled above. 191 // Convert the smaller operand to the bigger result. 192 int result = Context.getFloatingTypeOrder(lhs, rhs); 193 194 if (result > 0) { // convert the rhs 195 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 196 return lhs; 197 } 198 if (result < 0) { // convert the lhs 199 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 200 return rhs; 201 } 202 assert(0 && "Sema::UsualArithmeticConversions(): illegal float comparison"); 203 } 204 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 205 // Handle GCC complex int extension. 206 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 207 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 208 209 if (lhsComplexInt && rhsComplexInt) { 210 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 211 rhsComplexInt->getElementType()) >= 0) { 212 // convert the rhs 213 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 214 return lhs; 215 } 216 if (!isCompAssign) 217 ImpCastExprToType(lhsExpr, rhs); // convert the lhs 218 return rhs; 219 } else if (lhsComplexInt && rhs->isIntegerType()) { 220 // convert the rhs to the lhs complex type. 221 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 222 return lhs; 223 } else if (rhsComplexInt && lhs->isIntegerType()) { 224 // convert the lhs to the rhs complex type. 225 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 226 return rhs; 227 } 228 } 229 // Finally, we have two differing integer types. 230 // The rules for this case are in C99 6.3.1.8 231 int compare = Context.getIntegerTypeOrder(lhs, rhs); 232 bool lhsSigned = lhs->isSignedIntegerType(), 233 rhsSigned = rhs->isSignedIntegerType(); 234 QualType destType; 235 if (lhsSigned == rhsSigned) { 236 // Same signedness; use the higher-ranked type 237 destType = compare >= 0 ? lhs : rhs; 238 } else if (compare != (lhsSigned ? 1 : -1)) { 239 // The unsigned type has greater than or equal rank to the 240 // signed type, so use the unsigned type 241 destType = lhsSigned ? rhs : lhs; 242 } else if (Context.getIntWidth(lhs) != Context.getIntWidth(rhs)) { 243 // The two types are different widths; if we are here, that 244 // means the signed type is larger than the unsigned type, so 245 // use the signed type. 246 destType = lhsSigned ? lhs : rhs; 247 } else { 248 // The signed type is higher-ranked than the unsigned type, 249 // but isn't actually any bigger (like unsigned int and long 250 // on most 32-bit systems). Use the unsigned type corresponding 251 // to the signed type. 252 destType = Context.getCorrespondingUnsignedType(lhsSigned ? lhs : rhs); 253 } 254 if (!isCompAssign) { 255 ImpCastExprToType(lhsExpr, destType); 256 ImpCastExprToType(rhsExpr, destType); 257 } 258 return destType; 259} 260 261//===----------------------------------------------------------------------===// 262// Semantic Analysis for various Expression Types 263//===----------------------------------------------------------------------===// 264 265 266/// ActOnStringLiteral - The specified tokens were lexed as pasted string 267/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 268/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 269/// multiple tokens. However, the common case is that StringToks points to one 270/// string. 271/// 272Action::ExprResult 273Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 274 assert(NumStringToks && "Must have at least one string!"); 275 276 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 277 if (Literal.hadError) 278 return ExprResult(true); 279 280 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 281 for (unsigned i = 0; i != NumStringToks; ++i) 282 StringTokLocs.push_back(StringToks[i].getLocation()); 283 284 // Verify that pascal strings aren't too large. 285 if (Literal.Pascal && Literal.GetStringLength() > 256) 286 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long, 287 SourceRange(StringToks[0].getLocation(), 288 StringToks[NumStringToks-1].getLocation())); 289 290 QualType StrTy = Context.CharTy; 291 if (Literal.AnyWide) StrTy = Context.getWCharType(); 292 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 293 294 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 295 if (getLangOptions().CPlusPlus) 296 StrTy.addConst(); 297 298 // Get an array type for the string, according to C99 6.4.5. This includes 299 // the nul terminator character as well as the string length for pascal 300 // strings. 301 StrTy = Context.getConstantArrayType(StrTy, 302 llvm::APInt(32, Literal.GetStringLength()+1), 303 ArrayType::Normal, 0); 304 305 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 306 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 307 Literal.AnyWide, StrTy, 308 StringToks[0].getLocation(), 309 StringToks[NumStringToks-1].getLocation()); 310} 311 312/// ShouldSnapshotBlockValueReference - Return true if a reference inside of 313/// CurBlock to VD should cause it to be snapshotted (as we do for auto 314/// variables defined outside the block) or false if this is not needed (e.g. 315/// for values inside the block or for globals). 316/// 317/// FIXME: This will create BlockDeclRefExprs for global variables, 318/// function references, etc which is suboptimal :) and breaks 319/// things like "integer constant expression" tests. 320static bool ShouldSnapshotBlockValueReference(BlockSemaInfo *CurBlock, 321 ValueDecl *VD) { 322 // If the value is defined inside the block, we couldn't snapshot it even if 323 // we wanted to. 324 if (CurBlock->TheDecl == VD->getDeclContext()) 325 return false; 326 327 // If this is an enum constant or function, it is constant, don't snapshot. 328 if (isa<EnumConstantDecl>(VD) || isa<FunctionDecl>(VD)) 329 return false; 330 331 // If this is a reference to an extern, static, or global variable, no need to 332 // snapshot it. 333 // FIXME: What about 'const' variables in C++? 334 if (const VarDecl *Var = dyn_cast<VarDecl>(VD)) 335 return Var->hasLocalStorage(); 336 337 return true; 338} 339 340 341 342/// ActOnIdentifierExpr - The parser read an identifier in expression context, 343/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 344/// identifier is used in a function call context. 345Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 346 IdentifierInfo &II, 347 bool HasTrailingLParen) { 348 // Could be enum-constant, value decl, instance variable, etc. 349 Decl *D = LookupDecl(&II, Decl::IDNS_Ordinary, S); 350 351 // If this reference is in an Objective-C method, then ivar lookup happens as 352 // well. 353 if (getCurMethodDecl()) { 354 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 355 // There are two cases to handle here. 1) scoped lookup could have failed, 356 // in which case we should look for an ivar. 2) scoped lookup could have 357 // found a decl, but that decl is outside the current method (i.e. a global 358 // variable). In these two cases, we do a lookup for an ivar with this 359 // name, if the lookup suceeds, we replace it our current decl. 360 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 361 ObjCInterfaceDecl *IFace = getCurMethodDecl()->getClassInterface(); 362 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&II)) { 363 // FIXME: This should use a new expr for a direct reference, don't turn 364 // this into Self->ivar, just return a BareIVarExpr or something. 365 IdentifierInfo &II = Context.Idents.get("self"); 366 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 367 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 368 static_cast<Expr*>(SelfExpr.Val), true, true); 369 } 370 } 371 // Needed to implement property "super.method" notation. 372 if (SD == 0 && &II == SuperID) { 373 QualType T = Context.getPointerType(Context.getObjCInterfaceType( 374 getCurMethodDecl()->getClassInterface())); 375 return new PredefinedExpr(Loc, T, PredefinedExpr::ObjCSuper); 376 } 377 } 378 if (D == 0) { 379 // Otherwise, this could be an implicitly declared function reference (legal 380 // in C90, extension in C99). 381 if (HasTrailingLParen && 382 !getLangOptions().CPlusPlus) // Not in C++. 383 D = ImplicitlyDefineFunction(Loc, II, S); 384 else { 385 // If this name wasn't predeclared and if this is not a function call, 386 // diagnose the problem. 387 return Diag(Loc, diag::err_undeclared_var_use, II.getName()); 388 } 389 } 390 391 if (CXXFieldDecl *FD = dyn_cast<CXXFieldDecl>(D)) { 392 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(CurContext)) { 393 if (MD->isStatic()) 394 // "invalid use of member 'x' in static member function" 395 return Diag(Loc, diag::err_invalid_member_use_in_static_method, 396 FD->getName()); 397 if (cast<CXXRecordDecl>(MD->getParent()) != FD->getParent()) 398 // "invalid use of nonstatic data member 'x'" 399 return Diag(Loc, diag::err_invalid_non_static_member_use, 400 FD->getName()); 401 402 if (FD->isInvalidDecl()) 403 return true; 404 405 return new DeclRefExpr(FD, FD->getType(), Loc); 406 } 407 408 return Diag(Loc, diag::err_invalid_non_static_member_use, FD->getName()); 409 } 410 if (isa<TypedefDecl>(D)) 411 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 412 if (isa<ObjCInterfaceDecl>(D)) 413 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 414 if (isa<NamespaceDecl>(D)) 415 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 416 417 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 418 if (OverloadedFunctionDecl *Ovl = dyn_cast<OverloadedFunctionDecl>(D)) 419 return new DeclRefExpr(Ovl, Context.OverloadTy, Loc); 420 421 ValueDecl *VD = cast<ValueDecl>(D); 422 423 // check if referencing an identifier with __attribute__((deprecated)). 424 if (VD->getAttr<DeprecatedAttr>()) 425 Diag(Loc, diag::warn_deprecated, VD->getName()); 426 427 // Only create DeclRefExpr's for valid Decl's. 428 if (VD->isInvalidDecl()) 429 return true; 430 431 // If the identifier reference is inside a block, and it refers to a value 432 // that is outside the block, create a BlockDeclRefExpr instead of a 433 // DeclRefExpr. This ensures the value is treated as a copy-in snapshot when 434 // the block is formed. 435 // 436 // We do not do this for things like enum constants, global variables, etc, 437 // as they do not get snapshotted. 438 // 439 if (CurBlock && ShouldSnapshotBlockValueReference(CurBlock, VD)) { 440 // The BlocksAttr indicates the variable is bound by-reference. 441 if (VD->getAttr<BlocksAttr>()) 442 return new BlockDeclRefExpr(VD, VD->getType(), Loc, true); 443 444 // Variable will be bound by-copy, make it const within the closure. 445 VD->getType().addConst(); 446 return new BlockDeclRefExpr(VD, VD->getType(), Loc, false); 447 } 448 // If this reference is not in a block or if the referenced variable is 449 // within the block, create a normal DeclRefExpr. 450 return new DeclRefExpr(VD, VD->getType().getNonReferenceType(), Loc); 451} 452 453Sema::ExprResult Sema::ActOnPredefinedExpr(SourceLocation Loc, 454 tok::TokenKind Kind) { 455 PredefinedExpr::IdentType IT; 456 457 switch (Kind) { 458 default: assert(0 && "Unknown simple primary expr!"); 459 case tok::kw___func__: IT = PredefinedExpr::Func; break; // [C99 6.4.2.2] 460 case tok::kw___FUNCTION__: IT = PredefinedExpr::Function; break; 461 case tok::kw___PRETTY_FUNCTION__: IT = PredefinedExpr::PrettyFunction; break; 462 } 463 464 // Verify that this is in a function context. 465 if (getCurFunctionDecl() == 0 && getCurMethodDecl() == 0) 466 return Diag(Loc, diag::err_predef_outside_function); 467 468 // Pre-defined identifiers are of type char[x], where x is the length of the 469 // string. 470 unsigned Length; 471 if (getCurFunctionDecl()) 472 Length = getCurFunctionDecl()->getIdentifier()->getLength(); 473 else 474 Length = getCurMethodDecl()->getSynthesizedMethodSize(); 475 476 llvm::APInt LengthI(32, Length + 1); 477 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 478 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 479 return new PredefinedExpr(Loc, ResTy, IT); 480} 481 482Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 483 llvm::SmallString<16> CharBuffer; 484 CharBuffer.resize(Tok.getLength()); 485 const char *ThisTokBegin = &CharBuffer[0]; 486 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 487 488 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 489 Tok.getLocation(), PP); 490 if (Literal.hadError()) 491 return ExprResult(true); 492 493 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 494 495 return new CharacterLiteral(Literal.getValue(), Literal.isWide(), type, 496 Tok.getLocation()); 497} 498 499Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 500 // fast path for a single digit (which is quite common). A single digit 501 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 502 if (Tok.getLength() == 1) { 503 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 504 505 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 506 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 507 Context.IntTy, 508 Tok.getLocation())); 509 } 510 llvm::SmallString<512> IntegerBuffer; 511 // Add padding so that NumericLiteralParser can overread by one character. 512 IntegerBuffer.resize(Tok.getLength()+1); 513 const char *ThisTokBegin = &IntegerBuffer[0]; 514 515 // Get the spelling of the token, which eliminates trigraphs, etc. 516 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 517 518 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 519 Tok.getLocation(), PP); 520 if (Literal.hadError) 521 return ExprResult(true); 522 523 Expr *Res; 524 525 if (Literal.isFloatingLiteral()) { 526 QualType Ty; 527 if (Literal.isFloat) 528 Ty = Context.FloatTy; 529 else if (!Literal.isLong) 530 Ty = Context.DoubleTy; 531 else 532 Ty = Context.LongDoubleTy; 533 534 const llvm::fltSemantics &Format = Context.getFloatTypeSemantics(Ty); 535 536 // isExact will be set by GetFloatValue(). 537 bool isExact = false; 538 Res = new FloatingLiteral(Literal.GetFloatValue(Format, &isExact), &isExact, 539 Ty, Tok.getLocation()); 540 541 } else if (!Literal.isIntegerLiteral()) { 542 return ExprResult(true); 543 } else { 544 QualType Ty; 545 546 // long long is a C99 feature. 547 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 548 Literal.isLongLong) 549 Diag(Tok.getLocation(), diag::ext_longlong); 550 551 // Get the value in the widest-possible width. 552 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 553 554 if (Literal.GetIntegerValue(ResultVal)) { 555 // If this value didn't fit into uintmax_t, warn and force to ull. 556 Diag(Tok.getLocation(), diag::warn_integer_too_large); 557 Ty = Context.UnsignedLongLongTy; 558 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 559 "long long is not intmax_t?"); 560 } else { 561 // If this value fits into a ULL, try to figure out what else it fits into 562 // according to the rules of C99 6.4.4.1p5. 563 564 // Octal, Hexadecimal, and integers with a U suffix are allowed to 565 // be an unsigned int. 566 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 567 568 // Check from smallest to largest, picking the smallest type we can. 569 unsigned Width = 0; 570 if (!Literal.isLong && !Literal.isLongLong) { 571 // Are int/unsigned possibilities? 572 unsigned IntSize = Context.Target.getIntWidth(); 573 574 // Does it fit in a unsigned int? 575 if (ResultVal.isIntN(IntSize)) { 576 // Does it fit in a signed int? 577 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 578 Ty = Context.IntTy; 579 else if (AllowUnsigned) 580 Ty = Context.UnsignedIntTy; 581 Width = IntSize; 582 } 583 } 584 585 // Are long/unsigned long possibilities? 586 if (Ty.isNull() && !Literal.isLongLong) { 587 unsigned LongSize = Context.Target.getLongWidth(); 588 589 // Does it fit in a unsigned long? 590 if (ResultVal.isIntN(LongSize)) { 591 // Does it fit in a signed long? 592 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 593 Ty = Context.LongTy; 594 else if (AllowUnsigned) 595 Ty = Context.UnsignedLongTy; 596 Width = LongSize; 597 } 598 } 599 600 // Finally, check long long if needed. 601 if (Ty.isNull()) { 602 unsigned LongLongSize = Context.Target.getLongLongWidth(); 603 604 // Does it fit in a unsigned long long? 605 if (ResultVal.isIntN(LongLongSize)) { 606 // Does it fit in a signed long long? 607 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 608 Ty = Context.LongLongTy; 609 else if (AllowUnsigned) 610 Ty = Context.UnsignedLongLongTy; 611 Width = LongLongSize; 612 } 613 } 614 615 // If we still couldn't decide a type, we probably have something that 616 // does not fit in a signed long long, but has no U suffix. 617 if (Ty.isNull()) { 618 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 619 Ty = Context.UnsignedLongLongTy; 620 Width = Context.Target.getLongLongWidth(); 621 } 622 623 if (ResultVal.getBitWidth() != Width) 624 ResultVal.trunc(Width); 625 } 626 627 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 628 } 629 630 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 631 if (Literal.isImaginary) 632 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 633 634 return Res; 635} 636 637Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 638 ExprTy *Val) { 639 Expr *E = (Expr *)Val; 640 assert((E != 0) && "ActOnParenExpr() missing expr"); 641 return new ParenExpr(L, R, E); 642} 643 644/// The UsualUnaryConversions() function is *not* called by this routine. 645/// See C99 6.3.2.1p[2-4] for more details. 646QualType Sema::CheckSizeOfAlignOfOperand(QualType exprType, 647 SourceLocation OpLoc, 648 const SourceRange &ExprRange, 649 bool isSizeof) { 650 // C99 6.5.3.4p1: 651 if (isa<FunctionType>(exprType) && isSizeof) 652 // alignof(function) is allowed. 653 Diag(OpLoc, diag::ext_sizeof_function_type, ExprRange); 654 else if (exprType->isVoidType()) 655 Diag(OpLoc, diag::ext_sizeof_void_type, isSizeof ? "sizeof" : "__alignof", 656 ExprRange); 657 else if (exprType->isIncompleteType()) { 658 Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 659 diag::err_alignof_incomplete_type, 660 exprType.getAsString(), ExprRange); 661 return QualType(); // error 662 } 663 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 664 return Context.getSizeType(); 665} 666 667Action::ExprResult Sema:: 668ActOnSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, 669 SourceLocation LPLoc, TypeTy *Ty, 670 SourceLocation RPLoc) { 671 // If error parsing type, ignore. 672 if (Ty == 0) return true; 673 674 // Verify that this is a valid expression. 675 QualType ArgTy = QualType::getFromOpaquePtr(Ty); 676 677 QualType resultType = 678 CheckSizeOfAlignOfOperand(ArgTy, OpLoc, SourceRange(LPLoc, RPLoc),isSizeof); 679 680 if (resultType.isNull()) 681 return true; 682 return new SizeOfAlignOfTypeExpr(isSizeof, ArgTy, resultType, OpLoc, RPLoc); 683} 684 685QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 686 DefaultFunctionArrayConversion(V); 687 688 // These operators return the element type of a complex type. 689 if (const ComplexType *CT = V->getType()->getAsComplexType()) 690 return CT->getElementType(); 691 692 // Otherwise they pass through real integer and floating point types here. 693 if (V->getType()->isArithmeticType()) 694 return V->getType(); 695 696 // Reject anything else. 697 Diag(Loc, diag::err_realimag_invalid_type, V->getType().getAsString()); 698 return QualType(); 699} 700 701 702 703Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 704 tok::TokenKind Kind, 705 ExprTy *Input) { 706 UnaryOperator::Opcode Opc; 707 switch (Kind) { 708 default: assert(0 && "Unknown unary op!"); 709 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 710 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 711 } 712 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 713 if (result.isNull()) 714 return true; 715 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 716} 717 718Action::ExprResult Sema:: 719ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 720 ExprTy *Idx, SourceLocation RLoc) { 721 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 722 723 // Perform default conversions. 724 DefaultFunctionArrayConversion(LHSExp); 725 DefaultFunctionArrayConversion(RHSExp); 726 727 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 728 729 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 730 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 731 // in the subscript position. As a result, we need to derive the array base 732 // and index from the expression types. 733 Expr *BaseExpr, *IndexExpr; 734 QualType ResultType; 735 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 736 BaseExpr = LHSExp; 737 IndexExpr = RHSExp; 738 // FIXME: need to deal with const... 739 ResultType = PTy->getPointeeType(); 740 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 741 // Handle the uncommon case of "123[Ptr]". 742 BaseExpr = RHSExp; 743 IndexExpr = LHSExp; 744 // FIXME: need to deal with const... 745 ResultType = PTy->getPointeeType(); 746 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 747 BaseExpr = LHSExp; // vectors: V[123] 748 IndexExpr = RHSExp; 749 750 // Component access limited to variables (reject vec4.rg[1]). 751 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 752 !isa<ExtVectorElementExpr>(BaseExpr)) 753 return Diag(LLoc, diag::err_ext_vector_component_access, 754 SourceRange(LLoc, RLoc)); 755 // FIXME: need to deal with const... 756 ResultType = VTy->getElementType(); 757 } else { 758 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value, 759 RHSExp->getSourceRange()); 760 } 761 // C99 6.5.2.1p1 762 if (!IndexExpr->getType()->isIntegerType()) 763 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript, 764 IndexExpr->getSourceRange()); 765 766 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 767 // the following check catches trying to index a pointer to a function (e.g. 768 // void (*)(int)) and pointers to incomplete types. Functions are not 769 // objects in C99. 770 if (!ResultType->isObjectType()) 771 return Diag(BaseExpr->getLocStart(), 772 diag::err_typecheck_subscript_not_object, 773 BaseExpr->getType().getAsString(), BaseExpr->getSourceRange()); 774 775 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 776} 777 778QualType Sema:: 779CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 780 IdentifierInfo &CompName, SourceLocation CompLoc) { 781 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 782 783 // This flag determines whether or not the component is to be treated as a 784 // special name, or a regular GLSL-style component access. 785 bool SpecialComponent = false; 786 787 // The vector accessor can't exceed the number of elements. 788 const char *compStr = CompName.getName(); 789 if (strlen(compStr) > vecType->getNumElements()) { 790 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 791 baseType.getAsString(), SourceRange(CompLoc)); 792 return QualType(); 793 } 794 795 // Check that we've found one of the special components, or that the component 796 // names must come from the same set. 797 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 798 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 799 SpecialComponent = true; 800 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 801 do 802 compStr++; 803 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 804 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 805 do 806 compStr++; 807 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 808 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 809 do 810 compStr++; 811 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 812 } 813 814 if (!SpecialComponent && *compStr) { 815 // We didn't get to the end of the string. This means the component names 816 // didn't come from the same set *or* we encountered an illegal name. 817 Diag(OpLoc, diag::err_ext_vector_component_name_illegal, 818 std::string(compStr,compStr+1), SourceRange(CompLoc)); 819 return QualType(); 820 } 821 // Each component accessor can't exceed the vector type. 822 compStr = CompName.getName(); 823 while (*compStr) { 824 if (vecType->isAccessorWithinNumElements(*compStr)) 825 compStr++; 826 else 827 break; 828 } 829 if (!SpecialComponent && *compStr) { 830 // We didn't get to the end of the string. This means a component accessor 831 // exceeds the number of elements in the vector. 832 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 833 baseType.getAsString(), SourceRange(CompLoc)); 834 return QualType(); 835 } 836 837 // If we have a special component name, verify that the current vector length 838 // is an even number, since all special component names return exactly half 839 // the elements. 840 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 841 Diag(OpLoc, diag::err_ext_vector_component_requires_even, 842 baseType.getAsString(), SourceRange(CompLoc)); 843 return QualType(); 844 } 845 846 // The component accessor looks fine - now we need to compute the actual type. 847 // The vector type is implied by the component accessor. For example, 848 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 849 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 850 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 851 : strlen(CompName.getName()); 852 if (CompSize == 1) 853 return vecType->getElementType(); 854 855 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 856 // Now look up the TypeDefDecl from the vector type. Without this, 857 // diagostics look bad. We want extended vector types to appear built-in. 858 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 859 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 860 return Context.getTypedefType(ExtVectorDecls[i]); 861 } 862 return VT; // should never get here (a typedef type should always be found). 863} 864 865/// constructSetterName - Return the setter name for the given 866/// identifier, i.e. "set" + Name where the initial character of Name 867/// has been capitalized. 868// FIXME: Merge with same routine in Parser. But where should this 869// live? 870static IdentifierInfo *constructSetterName(IdentifierTable &Idents, 871 const IdentifierInfo *Name) { 872 unsigned N = Name->getLength(); 873 char *SelectorName = new char[3 + N]; 874 memcpy(SelectorName, "set", 3); 875 memcpy(&SelectorName[3], Name->getName(), N); 876 SelectorName[3] = toupper(SelectorName[3]); 877 878 IdentifierInfo *Setter = 879 &Idents.get(SelectorName, &SelectorName[3 + N]); 880 delete[] SelectorName; 881 return Setter; 882} 883 884Action::ExprResult Sema:: 885ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 886 tok::TokenKind OpKind, SourceLocation MemberLoc, 887 IdentifierInfo &Member) { 888 Expr *BaseExpr = static_cast<Expr *>(Base); 889 assert(BaseExpr && "no record expression"); 890 891 // Perform default conversions. 892 DefaultFunctionArrayConversion(BaseExpr); 893 894 QualType BaseType = BaseExpr->getType(); 895 assert(!BaseType.isNull() && "no type for member expression"); 896 897 // Get the type being accessed in BaseType. If this is an arrow, the BaseExpr 898 // must have pointer type, and the accessed type is the pointee. 899 if (OpKind == tok::arrow) { 900 if (const PointerType *PT = BaseType->getAsPointerType()) 901 BaseType = PT->getPointeeType(); 902 else 903 return Diag(MemberLoc, diag::err_typecheck_member_reference_arrow, 904 BaseType.getAsString(), BaseExpr->getSourceRange()); 905 } 906 907 // Handle field access to simple records. This also handles access to fields 908 // of the ObjC 'id' struct. 909 if (const RecordType *RTy = BaseType->getAsRecordType()) { 910 RecordDecl *RDecl = RTy->getDecl(); 911 if (RTy->isIncompleteType()) 912 return Diag(OpLoc, diag::err_typecheck_incomplete_tag, RDecl->getName(), 913 BaseExpr->getSourceRange()); 914 // The record definition is complete, now make sure the member is valid. 915 FieldDecl *MemberDecl = RDecl->getMember(&Member); 916 if (!MemberDecl) 917 return Diag(MemberLoc, diag::err_typecheck_no_member, Member.getName(), 918 BaseExpr->getSourceRange()); 919 920 // Figure out the type of the member; see C99 6.5.2.3p3 921 // FIXME: Handle address space modifiers 922 QualType MemberType = MemberDecl->getType(); 923 unsigned combinedQualifiers = 924 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 925 MemberType = MemberType.getQualifiedType(combinedQualifiers); 926 927 return new MemberExpr(BaseExpr, OpKind == tok::arrow, MemberDecl, 928 MemberLoc, MemberType); 929 } 930 931 // Handle access to Objective-C instance variables, such as "Obj->ivar" and 932 // (*Obj).ivar. 933 if (const ObjCInterfaceType *IFTy = BaseType->getAsObjCInterfaceType()) { 934 if (ObjCIvarDecl *IV = IFTy->getDecl()->lookupInstanceVariable(&Member)) 935 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 936 OpKind == tok::arrow); 937 return Diag(MemberLoc, diag::err_typecheck_member_reference_ivar, 938 IFTy->getDecl()->getName(), Member.getName(), 939 BaseExpr->getSourceRange()); 940 } 941 942 // Handle Objective-C property access, which is "Obj.property" where Obj is a 943 // pointer to a (potentially qualified) interface type. 944 const PointerType *PTy; 945 const ObjCInterfaceType *IFTy; 946 if (OpKind == tok::period && (PTy = BaseType->getAsPointerType()) && 947 (IFTy = PTy->getPointeeType()->getAsObjCInterfaceType())) { 948 ObjCInterfaceDecl *IFace = IFTy->getDecl(); 949 950 // Search for a declared property first. 951 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(&Member)) 952 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 953 954 // Check protocols on qualified interfaces. 955 for (ObjCInterfaceType::qual_iterator I = IFTy->qual_begin(), 956 E = IFTy->qual_end(); I != E; ++I) 957 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 958 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 959 960 // If that failed, look for an "implicit" property by seeing if the nullary 961 // selector is implemented. 962 963 // FIXME: The logic for looking up nullary and unary selectors should be 964 // shared with the code in ActOnInstanceMessage. 965 966 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 967 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 968 969 // If this reference is in an @implementation, check for 'private' methods. 970 if (!Getter) 971 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 972 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 973 if (ObjCImplementationDecl *ImpDecl = 974 ObjCImplementations[ClassDecl->getIdentifier()]) 975 Getter = ImpDecl->getInstanceMethod(Sel); 976 977 // Look through local category implementations associated with the class. 978 if (!Getter) { 979 for (unsigned i = 0; i < ObjCCategoryImpls.size() && !Getter; i++) { 980 if (ObjCCategoryImpls[i]->getClassInterface() == IFace) 981 Getter = ObjCCategoryImpls[i]->getInstanceMethod(Sel); 982 } 983 } 984 if (Getter) { 985 // If we found a getter then this may be a valid dot-reference, we 986 // need to also look for the matching setter. 987 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 988 &Member); 989 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 990 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 991 992 if (!Setter) { 993 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 994 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 995 if (ObjCImplementationDecl *ImpDecl = 996 ObjCImplementations[ClassDecl->getIdentifier()]) 997 Setter = ImpDecl->getInstanceMethod(SetterSel); 998 } 999 1000 // FIXME: There are some issues here. First, we are not 1001 // diagnosing accesses to read-only properties because we do not 1002 // know if this is a getter or setter yet. Second, we are 1003 // checking that the type of the setter matches the type we 1004 // expect. 1005 return new ObjCPropertyRefExpr(Getter, Setter, Getter->getResultType(), 1006 MemberLoc, BaseExpr); 1007 } 1008 } 1009 // Handle properties on qualified "id" protocols. 1010 const ObjCQualifiedIdType *QIdTy; 1011 if (OpKind == tok::period && (QIdTy = BaseType->getAsObjCQualifiedIdType())) { 1012 // Check protocols on qualified interfaces. 1013 for (ObjCQualifiedIdType::qual_iterator I = QIdTy->qual_begin(), 1014 E = QIdTy->qual_end(); I != E; ++I) 1015 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(&Member)) 1016 return new ObjCPropertyRefExpr(PD, PD->getType(), MemberLoc, BaseExpr); 1017 } 1018 // Handle 'field access' to vectors, such as 'V.xx'. 1019 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1020 // Component access limited to variables (reject vec4.rg.g). 1021 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1022 !isa<ExtVectorElementExpr>(BaseExpr)) 1023 return Diag(MemberLoc, diag::err_ext_vector_component_access, 1024 BaseExpr->getSourceRange()); 1025 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1026 if (ret.isNull()) 1027 return true; 1028 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1029 } 1030 1031 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union, 1032 BaseType.getAsString(), BaseExpr->getSourceRange()); 1033} 1034 1035/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1036/// This provides the location of the left/right parens and a list of comma 1037/// locations. 1038Action::ExprResult Sema:: 1039ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 1040 ExprTy **args, unsigned NumArgs, 1041 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1042 Expr *Fn = static_cast<Expr *>(fn); 1043 Expr **Args = reinterpret_cast<Expr**>(args); 1044 assert(Fn && "no function call expression"); 1045 FunctionDecl *FDecl = NULL; 1046 OverloadedFunctionDecl *Ovl = NULL; 1047 1048 // If we're directly calling a function or a set of overloaded 1049 // functions, get the appropriate declaration. 1050 { 1051 DeclRefExpr *DRExpr = NULL; 1052 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1053 DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr()); 1054 else 1055 DRExpr = dyn_cast<DeclRefExpr>(Fn); 1056 1057 if (DRExpr) { 1058 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1059 Ovl = dyn_cast<OverloadedFunctionDecl>(DRExpr->getDecl()); 1060 } 1061 } 1062 1063 // If we have a set of overloaded functions, perform overload 1064 // resolution to pick the function. 1065 if (Ovl) { 1066 OverloadCandidateSet CandidateSet; 1067 OverloadCandidateSet::iterator Best; 1068 AddOverloadCandidates(Ovl, Args, NumArgs, CandidateSet); 1069 switch (BestViableFunction(CandidateSet, Best)) { 1070 case OR_Success: 1071 { 1072 // Success! Let the remainder of this function build a call to 1073 // the function selected by overload resolution. 1074 FDecl = Best->Function; 1075 Expr *NewFn = new DeclRefExpr(FDecl, FDecl->getType(), 1076 Fn->getSourceRange().getBegin()); 1077 delete Fn; 1078 Fn = NewFn; 1079 } 1080 break; 1081 1082 case OR_No_Viable_Function: 1083 if (CandidateSet.empty()) 1084 Diag(Fn->getSourceRange().getBegin(), 1085 diag::err_ovl_no_viable_function_in_call, Ovl->getName(), 1086 Fn->getSourceRange()); 1087 else { 1088 Diag(Fn->getSourceRange().getBegin(), 1089 diag::err_ovl_no_viable_function_in_call_with_cands, 1090 Ovl->getName(), Fn->getSourceRange()); 1091 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false); 1092 } 1093 return true; 1094 1095 case OR_Ambiguous: 1096 Diag(Fn->getSourceRange().getBegin(), 1097 diag::err_ovl_ambiguous_call, Ovl->getName(), 1098 Fn->getSourceRange()); 1099 PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/true); 1100 return true; 1101 } 1102 } 1103 1104 // Promote the function operand. 1105 UsualUnaryConversions(Fn); 1106 1107 // Make the call expr early, before semantic checks. This guarantees cleanup 1108 // of arguments and function on error. 1109 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1110 Context.BoolTy, RParenLoc)); 1111 const FunctionType *FuncT; 1112 if (!Fn->getType()->isBlockPointerType()) { 1113 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1114 // have type pointer to function". 1115 const PointerType *PT = Fn->getType()->getAsPointerType(); 1116 if (PT == 0) 1117 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1118 Fn->getSourceRange()); 1119 FuncT = PT->getPointeeType()->getAsFunctionType(); 1120 } else { // This is a block call. 1121 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1122 getAsFunctionType(); 1123 } 1124 if (FuncT == 0) 1125 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1126 Fn->getSourceRange()); 1127 1128 // We know the result type of the call, set it. 1129 TheCall->setType(FuncT->getResultType()); 1130 1131 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1132 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1133 // assignment, to the types of the corresponding parameter, ... 1134 unsigned NumArgsInProto = Proto->getNumArgs(); 1135 unsigned NumArgsToCheck = NumArgs; 1136 1137 // If too few arguments are available (and we don't have default 1138 // arguments for the remaining parameters), don't make the call. 1139 if (NumArgs < NumArgsInProto) { 1140 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 1141 // Use default arguments for missing arguments 1142 NumArgsToCheck = NumArgsInProto; 1143 TheCall->setNumArgs(NumArgsInProto); 1144 } else 1145 return Diag(RParenLoc, 1146 !Fn->getType()->isBlockPointerType() 1147 ? diag::err_typecheck_call_too_few_args 1148 : diag::err_typecheck_block_too_few_args, 1149 Fn->getSourceRange()); 1150 } 1151 1152 // If too many are passed and not variadic, error on the extras and drop 1153 // them. 1154 if (NumArgs > NumArgsInProto) { 1155 if (!Proto->isVariadic()) { 1156 Diag(Args[NumArgsInProto]->getLocStart(), 1157 !Fn->getType()->isBlockPointerType() 1158 ? diag::err_typecheck_call_too_many_args 1159 : diag::err_typecheck_block_too_many_args, 1160 Fn->getSourceRange(), 1161 SourceRange(Args[NumArgsInProto]->getLocStart(), 1162 Args[NumArgs-1]->getLocEnd())); 1163 // This deletes the extra arguments. 1164 TheCall->setNumArgs(NumArgsInProto); 1165 } 1166 NumArgsToCheck = NumArgsInProto; 1167 } 1168 1169 // Continue to check argument types (even if we have too few/many args). 1170 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1171 QualType ProtoArgType = Proto->getArgType(i); 1172 1173 Expr *Arg; 1174 if (i < NumArgs) 1175 Arg = Args[i]; 1176 else 1177 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1178 QualType ArgType = Arg->getType(); 1179 1180 // Compute implicit casts from the operand to the formal argument type. 1181 AssignConvertType ConvTy = 1182 CheckSingleAssignmentConstraints(ProtoArgType, Arg); 1183 TheCall->setArg(i, Arg); 1184 1185 if (DiagnoseAssignmentResult(ConvTy, Arg->getLocStart(), ProtoArgType, 1186 ArgType, Arg, "passing")) 1187 return true; 1188 } 1189 1190 // If this is a variadic call, handle args passed through "...". 1191 if (Proto->isVariadic()) { 1192 // Promote the arguments (C99 6.5.2.2p7). 1193 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1194 Expr *Arg = Args[i]; 1195 DefaultArgumentPromotion(Arg); 1196 TheCall->setArg(i, Arg); 1197 } 1198 } 1199 } else { 1200 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1201 1202 // Promote the arguments (C99 6.5.2.2p6). 1203 for (unsigned i = 0; i != NumArgs; i++) { 1204 Expr *Arg = Args[i]; 1205 DefaultArgumentPromotion(Arg); 1206 TheCall->setArg(i, Arg); 1207 } 1208 } 1209 1210 // Do special checking on direct calls to functions. 1211 if (FDecl) 1212 return CheckFunctionCall(FDecl, TheCall.take()); 1213 1214 return TheCall.take(); 1215} 1216 1217Action::ExprResult Sema:: 1218ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1219 SourceLocation RParenLoc, ExprTy *InitExpr) { 1220 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1221 QualType literalType = QualType::getFromOpaquePtr(Ty); 1222 // FIXME: put back this assert when initializers are worked out. 1223 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1224 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1225 1226 if (literalType->isArrayType()) { 1227 if (literalType->isVariableArrayType()) 1228 return Diag(LParenLoc, 1229 diag::err_variable_object_no_init, 1230 SourceRange(LParenLoc, 1231 literalExpr->getSourceRange().getEnd())); 1232 } else if (literalType->isIncompleteType()) { 1233 return Diag(LParenLoc, 1234 diag::err_typecheck_decl_incomplete_type, 1235 literalType.getAsString(), 1236 SourceRange(LParenLoc, 1237 literalExpr->getSourceRange().getEnd())); 1238 } 1239 1240 if (CheckInitializerTypes(literalExpr, literalType)) 1241 return true; 1242 1243 bool isFileScope = !getCurFunctionDecl() && !getCurMethodDecl(); 1244 if (isFileScope) { // 6.5.2.5p3 1245 if (CheckForConstantInitializer(literalExpr, literalType)) 1246 return true; 1247 } 1248 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, isFileScope); 1249} 1250 1251Action::ExprResult Sema:: 1252ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1253 SourceLocation RBraceLoc) { 1254 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1255 1256 // Semantic analysis for initializers is done by ActOnDeclarator() and 1257 // CheckInitializer() - it requires knowledge of the object being intialized. 1258 1259 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc); 1260 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1261 return E; 1262} 1263 1264/// CheckCastTypes - Check type constraints for casting between types. 1265bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1266 UsualUnaryConversions(castExpr); 1267 1268 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1269 // type needs to be scalar. 1270 if (castType->isVoidType()) { 1271 // Cast to void allows any expr type. 1272 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1273 // GCC struct/union extension: allow cast to self. 1274 if (Context.getCanonicalType(castType) != 1275 Context.getCanonicalType(castExpr->getType()) || 1276 (!castType->isStructureType() && !castType->isUnionType())) { 1277 // Reject any other conversions to non-scalar types. 1278 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar, 1279 castType.getAsString(), castExpr->getSourceRange()); 1280 } 1281 1282 // accept this, but emit an ext-warn. 1283 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar, 1284 castType.getAsString(), castExpr->getSourceRange()); 1285 } else if (!castExpr->getType()->isScalarType() && 1286 !castExpr->getType()->isVectorType()) { 1287 return Diag(castExpr->getLocStart(), 1288 diag::err_typecheck_expect_scalar_operand, 1289 castExpr->getType().getAsString(),castExpr->getSourceRange()); 1290 } else if (castExpr->getType()->isVectorType()) { 1291 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1292 return true; 1293 } else if (castType->isVectorType()) { 1294 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1295 return true; 1296 } 1297 return false; 1298} 1299 1300bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1301 assert(VectorTy->isVectorType() && "Not a vector type!"); 1302 1303 if (Ty->isVectorType() || Ty->isIntegerType()) { 1304 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1305 return Diag(R.getBegin(), 1306 Ty->isVectorType() ? 1307 diag::err_invalid_conversion_between_vectors : 1308 diag::err_invalid_conversion_between_vector_and_integer, 1309 VectorTy.getAsString().c_str(), 1310 Ty.getAsString().c_str(), R); 1311 } else 1312 return Diag(R.getBegin(), 1313 diag::err_invalid_conversion_between_vector_and_scalar, 1314 VectorTy.getAsString().c_str(), 1315 Ty.getAsString().c_str(), R); 1316 1317 return false; 1318} 1319 1320Action::ExprResult Sema:: 1321ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1322 SourceLocation RParenLoc, ExprTy *Op) { 1323 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1324 1325 Expr *castExpr = static_cast<Expr*>(Op); 1326 QualType castType = QualType::getFromOpaquePtr(Ty); 1327 1328 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1329 return true; 1330 return new ExplicitCastExpr(castType, castExpr, LParenLoc); 1331} 1332 1333/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1334/// In that case, lex = cond. 1335inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1336 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1337 UsualUnaryConversions(cond); 1338 UsualUnaryConversions(lex); 1339 UsualUnaryConversions(rex); 1340 QualType condT = cond->getType(); 1341 QualType lexT = lex->getType(); 1342 QualType rexT = rex->getType(); 1343 1344 // first, check the condition. 1345 if (!condT->isScalarType()) { // C99 6.5.15p2 1346 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 1347 condT.getAsString()); 1348 return QualType(); 1349 } 1350 1351 // Now check the two expressions. 1352 1353 // If both operands have arithmetic type, do the usual arithmetic conversions 1354 // to find a common type: C99 6.5.15p3,5. 1355 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1356 UsualArithmeticConversions(lex, rex); 1357 return lex->getType(); 1358 } 1359 1360 // If both operands are the same structure or union type, the result is that 1361 // type. 1362 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1363 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1364 if (LHSRT->getDecl() == RHSRT->getDecl()) 1365 // "If both the operands have structure or union type, the result has 1366 // that type." This implies that CV qualifiers are dropped. 1367 return lexT.getUnqualifiedType(); 1368 } 1369 1370 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1371 // The following || allows only one side to be void (a GCC-ism). 1372 if (lexT->isVoidType() || rexT->isVoidType()) { 1373 if (!lexT->isVoidType()) 1374 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 1375 rex->getSourceRange()); 1376 if (!rexT->isVoidType()) 1377 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 1378 lex->getSourceRange()); 1379 ImpCastExprToType(lex, Context.VoidTy); 1380 ImpCastExprToType(rex, Context.VoidTy); 1381 return Context.VoidTy; 1382 } 1383 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1384 // the type of the other operand." 1385 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1386 Context.isObjCObjectPointerType(lexT)) && 1387 rex->isNullPointerConstant(Context)) { 1388 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1389 return lexT; 1390 } 1391 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1392 Context.isObjCObjectPointerType(rexT)) && 1393 lex->isNullPointerConstant(Context)) { 1394 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1395 return rexT; 1396 } 1397 // Handle the case where both operands are pointers before we handle null 1398 // pointer constants in case both operands are null pointer constants. 1399 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1400 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1401 // get the "pointed to" types 1402 QualType lhptee = LHSPT->getPointeeType(); 1403 QualType rhptee = RHSPT->getPointeeType(); 1404 1405 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1406 if (lhptee->isVoidType() && 1407 rhptee->isIncompleteOrObjectType()) { 1408 // Figure out necessary qualifiers (C99 6.5.15p6) 1409 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1410 QualType destType = Context.getPointerType(destPointee); 1411 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1412 ImpCastExprToType(rex, destType); // promote to void* 1413 return destType; 1414 } 1415 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1416 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1417 QualType destType = Context.getPointerType(destPointee); 1418 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1419 ImpCastExprToType(rex, destType); // promote to void* 1420 return destType; 1421 } 1422 1423 QualType compositeType = lexT; 1424 1425 // If either type is an Objective-C object type then check 1426 // compatibility according to Objective-C. 1427 if (Context.isObjCObjectPointerType(lexT) || 1428 Context.isObjCObjectPointerType(rexT)) { 1429 // If both operands are interfaces and either operand can be 1430 // assigned to the other, use that type as the composite 1431 // type. This allows 1432 // xxx ? (A*) a : (B*) b 1433 // where B is a subclass of A. 1434 // 1435 // Additionally, as for assignment, if either type is 'id' 1436 // allow silent coercion. Finally, if the types are 1437 // incompatible then make sure to use 'id' as the composite 1438 // type so the result is acceptable for sending messages to. 1439 1440 // FIXME: This code should not be localized to here. Also this 1441 // should use a compatible check instead of abusing the 1442 // canAssignObjCInterfaces code. 1443 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1444 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1445 if (LHSIface && RHSIface && 1446 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1447 compositeType = lexT; 1448 } else if (LHSIface && RHSIface && 1449 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1450 compositeType = rexT; 1451 } else if (Context.isObjCIdType(lhptee) || 1452 Context.isObjCIdType(rhptee)) { 1453 // FIXME: This code looks wrong, because isObjCIdType checks 1454 // the struct but getObjCIdType returns the pointer to 1455 // struct. This is horrible and should be fixed. 1456 compositeType = Context.getObjCIdType(); 1457 } else { 1458 QualType incompatTy = Context.getObjCIdType(); 1459 ImpCastExprToType(lex, incompatTy); 1460 ImpCastExprToType(rex, incompatTy); 1461 return incompatTy; 1462 } 1463 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1464 rhptee.getUnqualifiedType())) { 1465 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 1466 lexT.getAsString(), rexT.getAsString(), 1467 lex->getSourceRange(), rex->getSourceRange()); 1468 // In this situation, we assume void* type. No especially good 1469 // reason, but this is what gcc does, and we do have to pick 1470 // to get a consistent AST. 1471 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1472 ImpCastExprToType(lex, incompatTy); 1473 ImpCastExprToType(rex, incompatTy); 1474 return incompatTy; 1475 } 1476 // The pointer types are compatible. 1477 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1478 // differently qualified versions of compatible types, the result type is 1479 // a pointer to an appropriately qualified version of the *composite* 1480 // type. 1481 // FIXME: Need to calculate the composite type. 1482 // FIXME: Need to add qualifiers 1483 ImpCastExprToType(lex, compositeType); 1484 ImpCastExprToType(rex, compositeType); 1485 return compositeType; 1486 } 1487 } 1488 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1489 // evaluates to "struct objc_object *" (and is handled above when comparing 1490 // id with statically typed objects). 1491 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1492 // GCC allows qualified id and any Objective-C type to devolve to 1493 // id. Currently localizing to here until clear this should be 1494 // part of ObjCQualifiedIdTypesAreCompatible. 1495 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1496 (lexT->isObjCQualifiedIdType() && 1497 Context.isObjCObjectPointerType(rexT)) || 1498 (rexT->isObjCQualifiedIdType() && 1499 Context.isObjCObjectPointerType(lexT))) { 1500 // FIXME: This is not the correct composite type. This only 1501 // happens to work because id can more or less be used anywhere, 1502 // however this may change the type of method sends. 1503 // FIXME: gcc adds some type-checking of the arguments and emits 1504 // (confusing) incompatible comparison warnings in some 1505 // cases. Investigate. 1506 QualType compositeType = Context.getObjCIdType(); 1507 ImpCastExprToType(lex, compositeType); 1508 ImpCastExprToType(rex, compositeType); 1509 return compositeType; 1510 } 1511 } 1512 1513 // Selection between block pointer types is ok as long as they are the same. 1514 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1515 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1516 return lexT; 1517 1518 // Otherwise, the operands are not compatible. 1519 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 1520 lexT.getAsString(), rexT.getAsString(), 1521 lex->getSourceRange(), rex->getSourceRange()); 1522 return QualType(); 1523} 1524 1525/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1526/// in the case of a the GNU conditional expr extension. 1527Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1528 SourceLocation ColonLoc, 1529 ExprTy *Cond, ExprTy *LHS, 1530 ExprTy *RHS) { 1531 Expr *CondExpr = (Expr *) Cond; 1532 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1533 1534 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1535 // was the condition. 1536 bool isLHSNull = LHSExpr == 0; 1537 if (isLHSNull) 1538 LHSExpr = CondExpr; 1539 1540 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1541 RHSExpr, QuestionLoc); 1542 if (result.isNull()) 1543 return true; 1544 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1545 RHSExpr, result); 1546} 1547 1548 1549// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1550// being closely modeled after the C99 spec:-). The odd characteristic of this 1551// routine is it effectively iqnores the qualifiers on the top level pointee. 1552// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1553// FIXME: add a couple examples in this comment. 1554Sema::AssignConvertType 1555Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1556 QualType lhptee, rhptee; 1557 1558 // get the "pointed to" type (ignoring qualifiers at the top level) 1559 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1560 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1561 1562 // make sure we operate on the canonical type 1563 lhptee = Context.getCanonicalType(lhptee); 1564 rhptee = Context.getCanonicalType(rhptee); 1565 1566 AssignConvertType ConvTy = Compatible; 1567 1568 // C99 6.5.16.1p1: This following citation is common to constraints 1569 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1570 // qualifiers of the type *pointed to* by the right; 1571 // FIXME: Handle ASQualType 1572 if (!lhptee.isAtLeastAsQualifiedAs(rhptee)) 1573 ConvTy = CompatiblePointerDiscardsQualifiers; 1574 1575 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1576 // incomplete type and the other is a pointer to a qualified or unqualified 1577 // version of void... 1578 if (lhptee->isVoidType()) { 1579 if (rhptee->isIncompleteOrObjectType()) 1580 return ConvTy; 1581 1582 // As an extension, we allow cast to/from void* to function pointer. 1583 assert(rhptee->isFunctionType()); 1584 return FunctionVoidPointer; 1585 } 1586 1587 if (rhptee->isVoidType()) { 1588 if (lhptee->isIncompleteOrObjectType()) 1589 return ConvTy; 1590 1591 // As an extension, we allow cast to/from void* to function pointer. 1592 assert(lhptee->isFunctionType()); 1593 return FunctionVoidPointer; 1594 } 1595 1596 // Check for ObjC interfaces 1597 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1598 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1599 if (LHSIface && RHSIface && 1600 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1601 return ConvTy; 1602 1603 // ID acts sort of like void* for ObjC interfaces 1604 if (LHSIface && Context.isObjCIdType(rhptee)) 1605 return ConvTy; 1606 if (RHSIface && Context.isObjCIdType(lhptee)) 1607 return ConvTy; 1608 1609 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1610 // unqualified versions of compatible types, ... 1611 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1612 rhptee.getUnqualifiedType())) 1613 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1614 return ConvTy; 1615} 1616 1617/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1618/// block pointer types are compatible or whether a block and normal pointer 1619/// are compatible. It is more restrict than comparing two function pointer 1620// types. 1621Sema::AssignConvertType 1622Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1623 QualType rhsType) { 1624 QualType lhptee, rhptee; 1625 1626 // get the "pointed to" type (ignoring qualifiers at the top level) 1627 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1628 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1629 1630 // make sure we operate on the canonical type 1631 lhptee = Context.getCanonicalType(lhptee); 1632 rhptee = Context.getCanonicalType(rhptee); 1633 1634 AssignConvertType ConvTy = Compatible; 1635 1636 // For blocks we enforce that qualifiers are identical. 1637 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1638 ConvTy = CompatiblePointerDiscardsQualifiers; 1639 1640 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1641 return IncompatibleBlockPointer; 1642 return ConvTy; 1643} 1644 1645/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1646/// has code to accommodate several GCC extensions when type checking 1647/// pointers. Here are some objectionable examples that GCC considers warnings: 1648/// 1649/// int a, *pint; 1650/// short *pshort; 1651/// struct foo *pfoo; 1652/// 1653/// pint = pshort; // warning: assignment from incompatible pointer type 1654/// a = pint; // warning: assignment makes integer from pointer without a cast 1655/// pint = a; // warning: assignment makes pointer from integer without a cast 1656/// pint = pfoo; // warning: assignment from incompatible pointer type 1657/// 1658/// As a result, the code for dealing with pointers is more complex than the 1659/// C99 spec dictates. 1660/// 1661Sema::AssignConvertType 1662Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1663 // Get canonical types. We're not formatting these types, just comparing 1664 // them. 1665 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1666 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1667 1668 if (lhsType == rhsType) 1669 return Compatible; // Common case: fast path an exact match. 1670 1671 if (lhsType->isReferenceType() || rhsType->isReferenceType()) { 1672 if (Context.typesAreCompatible(lhsType, rhsType)) 1673 return Compatible; 1674 return Incompatible; 1675 } 1676 1677 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1678 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1679 return Compatible; 1680 // Relax integer conversions like we do for pointers below. 1681 if (rhsType->isIntegerType()) 1682 return IntToPointer; 1683 if (lhsType->isIntegerType()) 1684 return PointerToInt; 1685 return IncompatibleObjCQualifiedId; 1686 } 1687 1688 if (lhsType->isVectorType() || rhsType->isVectorType()) { 1689 // For ExtVector, allow vector splats; float -> <n x float> 1690 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 1691 if (LV->getElementType() == rhsType) 1692 return Compatible; 1693 1694 // If we are allowing lax vector conversions, and LHS and RHS are both 1695 // vectors, the total size only needs to be the same. This is a bitcast; 1696 // no bits are changed but the result type is different. 1697 if (getLangOptions().LaxVectorConversions && 1698 lhsType->isVectorType() && rhsType->isVectorType()) { 1699 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1700 return Compatible; 1701 } 1702 return Incompatible; 1703 } 1704 1705 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1706 return Compatible; 1707 1708 if (isa<PointerType>(lhsType)) { 1709 if (rhsType->isIntegerType()) 1710 return IntToPointer; 1711 1712 if (isa<PointerType>(rhsType)) 1713 return CheckPointerTypesForAssignment(lhsType, rhsType); 1714 1715 if (rhsType->getAsBlockPointerType()) { 1716 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1717 return BlockVoidPointer; 1718 1719 // Treat block pointers as objects. 1720 if (getLangOptions().ObjC1 && 1721 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 1722 return Compatible; 1723 } 1724 return Incompatible; 1725 } 1726 1727 if (isa<BlockPointerType>(lhsType)) { 1728 if (rhsType->isIntegerType()) 1729 return IntToPointer; 1730 1731 // Treat block pointers as objects. 1732 if (getLangOptions().ObjC1 && 1733 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 1734 return Compatible; 1735 1736 if (rhsType->isBlockPointerType()) 1737 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 1738 1739 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 1740 if (RHSPT->getPointeeType()->isVoidType()) 1741 return BlockVoidPointer; 1742 } 1743 return Incompatible; 1744 } 1745 1746 if (isa<PointerType>(rhsType)) { 1747 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1748 if (lhsType == Context.BoolTy) 1749 return Compatible; 1750 1751 if (lhsType->isIntegerType()) 1752 return PointerToInt; 1753 1754 if (isa<PointerType>(lhsType)) 1755 return CheckPointerTypesForAssignment(lhsType, rhsType); 1756 1757 if (isa<BlockPointerType>(lhsType) && 1758 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1759 return BlockVoidPointer; 1760 return Incompatible; 1761 } 1762 1763 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1764 if (Context.typesAreCompatible(lhsType, rhsType)) 1765 return Compatible; 1766 } 1767 return Incompatible; 1768} 1769 1770Sema::AssignConvertType 1771Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1772 if (getLangOptions().CPlusPlus) { 1773 if (!lhsType->isRecordType()) { 1774 // C++ 5.17p3: If the left operand is not of class type, the 1775 // expression is implicitly converted (C++ 4) to the 1776 // cv-unqualified type of the left operand. 1777 if (PerformImplicitConversion(rExpr, lhsType.getUnqualifiedType())) 1778 return Incompatible; 1779 else 1780 return Compatible; 1781 } 1782 1783 // FIXME: Currently, we fall through and treat C++ classes like C 1784 // structures. 1785 } 1786 1787 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1788 // a null pointer constant. 1789 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 1790 lhsType->isBlockPointerType()) 1791 && rExpr->isNullPointerConstant(Context)) { 1792 ImpCastExprToType(rExpr, lhsType); 1793 return Compatible; 1794 } 1795 1796 // We don't allow conversion of non-null-pointer constants to integers. 1797 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 1798 return IntToBlockPointer; 1799 1800 // This check seems unnatural, however it is necessary to ensure the proper 1801 // conversion of functions/arrays. If the conversion were done for all 1802 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1803 // expressions that surpress this implicit conversion (&, sizeof). 1804 // 1805 // Suppress this for references: C99 8.5.3p5. FIXME: revisit when references 1806 // are better understood. 1807 if (!lhsType->isReferenceType()) 1808 DefaultFunctionArrayConversion(rExpr); 1809 1810 Sema::AssignConvertType result = 1811 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1812 1813 // C99 6.5.16.1p2: The value of the right operand is converted to the 1814 // type of the assignment expression. 1815 if (rExpr->getType() != lhsType) 1816 ImpCastExprToType(rExpr, lhsType); 1817 return result; 1818} 1819 1820Sema::AssignConvertType 1821Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1822 return CheckAssignmentConstraints(lhsType, rhsType); 1823} 1824 1825QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1826 Diag(loc, diag::err_typecheck_invalid_operands, 1827 lex->getType().getAsString(), rex->getType().getAsString(), 1828 lex->getSourceRange(), rex->getSourceRange()); 1829 return QualType(); 1830} 1831 1832inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1833 Expr *&rex) { 1834 // For conversion purposes, we ignore any qualifiers. 1835 // For example, "const float" and "float" are equivalent. 1836 QualType lhsType = 1837 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 1838 QualType rhsType = 1839 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 1840 1841 // If the vector types are identical, return. 1842 if (lhsType == rhsType) 1843 return lhsType; 1844 1845 // Handle the case of a vector & extvector type of the same size and element 1846 // type. It would be nice if we only had one vector type someday. 1847 if (getLangOptions().LaxVectorConversions) 1848 if (const VectorType *LV = lhsType->getAsVectorType()) 1849 if (const VectorType *RV = rhsType->getAsVectorType()) 1850 if (LV->getElementType() == RV->getElementType() && 1851 LV->getNumElements() == RV->getNumElements()) 1852 return lhsType->isExtVectorType() ? lhsType : rhsType; 1853 1854 // If the lhs is an extended vector and the rhs is a scalar of the same type 1855 // or a literal, promote the rhs to the vector type. 1856 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1857 QualType eltType = V->getElementType(); 1858 1859 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 1860 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 1861 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 1862 ImpCastExprToType(rex, lhsType); 1863 return lhsType; 1864 } 1865 } 1866 1867 // If the rhs is an extended vector and the lhs is a scalar of the same type, 1868 // promote the lhs to the vector type. 1869 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1870 QualType eltType = V->getElementType(); 1871 1872 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 1873 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 1874 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 1875 ImpCastExprToType(lex, rhsType); 1876 return rhsType; 1877 } 1878 } 1879 1880 // You cannot convert between vector values of different size. 1881 Diag(loc, diag::err_typecheck_vector_not_convertable, 1882 lex->getType().getAsString(), rex->getType().getAsString(), 1883 lex->getSourceRange(), rex->getSourceRange()); 1884 return QualType(); 1885} 1886 1887inline QualType Sema::CheckMultiplyDivideOperands( 1888 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1889{ 1890 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1891 1892 if (lhsType->isVectorType() || rhsType->isVectorType()) 1893 return CheckVectorOperands(loc, lex, rex); 1894 1895 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1896 1897 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1898 return compType; 1899 return InvalidOperands(loc, lex, rex); 1900} 1901 1902inline QualType Sema::CheckRemainderOperands( 1903 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1904{ 1905 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1906 1907 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1908 1909 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1910 return compType; 1911 return InvalidOperands(loc, lex, rex); 1912} 1913 1914inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1915 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1916{ 1917 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1918 return CheckVectorOperands(loc, lex, rex); 1919 1920 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1921 1922 // handle the common case first (both operands are arithmetic). 1923 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1924 return compType; 1925 1926 // Put any potential pointer into PExp 1927 Expr* PExp = lex, *IExp = rex; 1928 if (IExp->getType()->isPointerType()) 1929 std::swap(PExp, IExp); 1930 1931 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1932 if (IExp->getType()->isIntegerType()) { 1933 // Check for arithmetic on pointers to incomplete types 1934 if (!PTy->getPointeeType()->isObjectType()) { 1935 if (PTy->getPointeeType()->isVoidType()) { 1936 Diag(loc, diag::ext_gnu_void_ptr, 1937 lex->getSourceRange(), rex->getSourceRange()); 1938 } else { 1939 Diag(loc, diag::err_typecheck_arithmetic_incomplete_type, 1940 lex->getType().getAsString(), lex->getSourceRange()); 1941 return QualType(); 1942 } 1943 } 1944 return PExp->getType(); 1945 } 1946 } 1947 1948 return InvalidOperands(loc, lex, rex); 1949} 1950 1951// C99 6.5.6 1952QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1953 SourceLocation loc, bool isCompAssign) { 1954 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1955 return CheckVectorOperands(loc, lex, rex); 1956 1957 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1958 1959 // Enforce type constraints: C99 6.5.6p3. 1960 1961 // Handle the common case first (both operands are arithmetic). 1962 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1963 return compType; 1964 1965 // Either ptr - int or ptr - ptr. 1966 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1967 QualType lpointee = LHSPTy->getPointeeType(); 1968 1969 // The LHS must be an object type, not incomplete, function, etc. 1970 if (!lpointee->isObjectType()) { 1971 // Handle the GNU void* extension. 1972 if (lpointee->isVoidType()) { 1973 Diag(loc, diag::ext_gnu_void_ptr, 1974 lex->getSourceRange(), rex->getSourceRange()); 1975 } else { 1976 Diag(loc, diag::err_typecheck_sub_ptr_object, 1977 lex->getType().getAsString(), lex->getSourceRange()); 1978 return QualType(); 1979 } 1980 } 1981 1982 // The result type of a pointer-int computation is the pointer type. 1983 if (rex->getType()->isIntegerType()) 1984 return lex->getType(); 1985 1986 // Handle pointer-pointer subtractions. 1987 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 1988 QualType rpointee = RHSPTy->getPointeeType(); 1989 1990 // RHS must be an object type, unless void (GNU). 1991 if (!rpointee->isObjectType()) { 1992 // Handle the GNU void* extension. 1993 if (rpointee->isVoidType()) { 1994 if (!lpointee->isVoidType()) 1995 Diag(loc, diag::ext_gnu_void_ptr, 1996 lex->getSourceRange(), rex->getSourceRange()); 1997 } else { 1998 Diag(loc, diag::err_typecheck_sub_ptr_object, 1999 rex->getType().getAsString(), rex->getSourceRange()); 2000 return QualType(); 2001 } 2002 } 2003 2004 // Pointee types must be compatible. 2005 if (!Context.typesAreCompatible( 2006 Context.getCanonicalType(lpointee).getUnqualifiedType(), 2007 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 2008 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 2009 lex->getType().getAsString(), rex->getType().getAsString(), 2010 lex->getSourceRange(), rex->getSourceRange()); 2011 return QualType(); 2012 } 2013 2014 return Context.getPointerDiffType(); 2015 } 2016 } 2017 2018 return InvalidOperands(loc, lex, rex); 2019} 2020 2021// C99 6.5.7 2022QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 2023 bool isCompAssign) { 2024 // C99 6.5.7p2: Each of the operands shall have integer type. 2025 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 2026 return InvalidOperands(loc, lex, rex); 2027 2028 // Shifts don't perform usual arithmetic conversions, they just do integer 2029 // promotions on each operand. C99 6.5.7p3 2030 if (!isCompAssign) 2031 UsualUnaryConversions(lex); 2032 UsualUnaryConversions(rex); 2033 2034 // "The type of the result is that of the promoted left operand." 2035 return lex->getType(); 2036} 2037 2038static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 2039 ASTContext& Context) { 2040 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 2041 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 2042 // ID acts sort of like void* for ObjC interfaces 2043 if (LHSIface && Context.isObjCIdType(RHS)) 2044 return true; 2045 if (RHSIface && Context.isObjCIdType(LHS)) 2046 return true; 2047 if (!LHSIface || !RHSIface) 2048 return false; 2049 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 2050 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 2051} 2052 2053// C99 6.5.8 2054QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 2055 bool isRelational) { 2056 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2057 return CheckVectorCompareOperands(lex, rex, loc, isRelational); 2058 2059 // C99 6.5.8p3 / C99 6.5.9p4 2060 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 2061 UsualArithmeticConversions(lex, rex); 2062 else { 2063 UsualUnaryConversions(lex); 2064 UsualUnaryConversions(rex); 2065 } 2066 QualType lType = lex->getType(); 2067 QualType rType = rex->getType(); 2068 2069 // For non-floating point types, check for self-comparisons of the form 2070 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2071 // often indicate logic errors in the program. 2072 if (!lType->isFloatingType()) { 2073 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2074 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2075 if (DRL->getDecl() == DRR->getDecl()) 2076 Diag(loc, diag::warn_selfcomparison); 2077 } 2078 2079 if (isRelational) { 2080 if (lType->isRealType() && rType->isRealType()) 2081 return Context.IntTy; 2082 } else { 2083 // Check for comparisons of floating point operands using != and ==. 2084 if (lType->isFloatingType()) { 2085 assert (rType->isFloatingType()); 2086 CheckFloatComparison(loc,lex,rex); 2087 } 2088 2089 if (lType->isArithmeticType() && rType->isArithmeticType()) 2090 return Context.IntTy; 2091 } 2092 2093 bool LHSIsNull = lex->isNullPointerConstant(Context); 2094 bool RHSIsNull = rex->isNullPointerConstant(Context); 2095 2096 // All of the following pointer related warnings are GCC extensions, except 2097 // when handling null pointer constants. One day, we can consider making them 2098 // errors (when -pedantic-errors is enabled). 2099 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2100 QualType LCanPointeeTy = 2101 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2102 QualType RCanPointeeTy = 2103 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2104 2105 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2106 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2107 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2108 RCanPointeeTy.getUnqualifiedType()) && 2109 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2110 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2111 lType.getAsString(), rType.getAsString(), 2112 lex->getSourceRange(), rex->getSourceRange()); 2113 } 2114 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2115 return Context.IntTy; 2116 } 2117 // Handle block pointer types. 2118 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2119 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2120 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2121 2122 if (!LHSIsNull && !RHSIsNull && 2123 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2124 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2125 lType.getAsString(), rType.getAsString(), 2126 lex->getSourceRange(), rex->getSourceRange()); 2127 } 2128 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2129 return Context.IntTy; 2130 } 2131 // Allow block pointers to be compared with null pointer constants. 2132 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2133 (lType->isPointerType() && rType->isBlockPointerType())) { 2134 if (!LHSIsNull && !RHSIsNull) { 2135 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2136 lType.getAsString(), rType.getAsString(), 2137 lex->getSourceRange(), rex->getSourceRange()); 2138 } 2139 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2140 return Context.IntTy; 2141 } 2142 2143 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2144 if ((lType->isPointerType() || rType->isPointerType()) && 2145 !Context.typesAreCompatible(lType, rType)) { 2146 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2147 lType.getAsString(), rType.getAsString(), 2148 lex->getSourceRange(), rex->getSourceRange()); 2149 ImpCastExprToType(rex, lType); 2150 return Context.IntTy; 2151 } 2152 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2153 ImpCastExprToType(rex, lType); 2154 return Context.IntTy; 2155 } else { 2156 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2157 Diag(loc, diag::warn_incompatible_qualified_id_operands, 2158 lType.getAsString(), rType.getAsString(), 2159 lex->getSourceRange(), rex->getSourceRange()); 2160 ImpCastExprToType(rex, lType); 2161 return Context.IntTy; 2162 } 2163 } 2164 } 2165 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2166 rType->isIntegerType()) { 2167 if (!RHSIsNull) 2168 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2169 lType.getAsString(), rType.getAsString(), 2170 lex->getSourceRange(), rex->getSourceRange()); 2171 ImpCastExprToType(rex, lType); // promote the integer to pointer 2172 return Context.IntTy; 2173 } 2174 if (lType->isIntegerType() && 2175 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2176 if (!LHSIsNull) 2177 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2178 lType.getAsString(), rType.getAsString(), 2179 lex->getSourceRange(), rex->getSourceRange()); 2180 ImpCastExprToType(lex, rType); // promote the integer to pointer 2181 return Context.IntTy; 2182 } 2183 // Handle block pointers. 2184 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2185 if (!RHSIsNull) 2186 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2187 lType.getAsString(), rType.getAsString(), 2188 lex->getSourceRange(), rex->getSourceRange()); 2189 ImpCastExprToType(rex, lType); // promote the integer to pointer 2190 return Context.IntTy; 2191 } 2192 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2193 if (!LHSIsNull) 2194 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2195 lType.getAsString(), rType.getAsString(), 2196 lex->getSourceRange(), rex->getSourceRange()); 2197 ImpCastExprToType(lex, rType); // promote the integer to pointer 2198 return Context.IntTy; 2199 } 2200 return InvalidOperands(loc, lex, rex); 2201} 2202 2203/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2204/// operates on extended vector types. Instead of producing an IntTy result, 2205/// like a scalar comparison, a vector comparison produces a vector of integer 2206/// types. 2207QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2208 SourceLocation loc, 2209 bool isRelational) { 2210 // Check to make sure we're operating on vectors of the same type and width, 2211 // Allowing one side to be a scalar of element type. 2212 QualType vType = CheckVectorOperands(loc, lex, rex); 2213 if (vType.isNull()) 2214 return vType; 2215 2216 QualType lType = lex->getType(); 2217 QualType rType = rex->getType(); 2218 2219 // For non-floating point types, check for self-comparisons of the form 2220 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2221 // often indicate logic errors in the program. 2222 if (!lType->isFloatingType()) { 2223 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2224 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2225 if (DRL->getDecl() == DRR->getDecl()) 2226 Diag(loc, diag::warn_selfcomparison); 2227 } 2228 2229 // Check for comparisons of floating point operands using != and ==. 2230 if (!isRelational && lType->isFloatingType()) { 2231 assert (rType->isFloatingType()); 2232 CheckFloatComparison(loc,lex,rex); 2233 } 2234 2235 // Return the type for the comparison, which is the same as vector type for 2236 // integer vectors, or an integer type of identical size and number of 2237 // elements for floating point vectors. 2238 if (lType->isIntegerType()) 2239 return lType; 2240 2241 const VectorType *VTy = lType->getAsVectorType(); 2242 2243 // FIXME: need to deal with non-32b int / non-64b long long 2244 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2245 if (TypeSize == 32) { 2246 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2247 } 2248 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2249 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2250} 2251 2252inline QualType Sema::CheckBitwiseOperands( 2253 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 2254{ 2255 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2256 return CheckVectorOperands(loc, lex, rex); 2257 2258 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2259 2260 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2261 return compType; 2262 return InvalidOperands(loc, lex, rex); 2263} 2264 2265inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2266 Expr *&lex, Expr *&rex, SourceLocation loc) 2267{ 2268 UsualUnaryConversions(lex); 2269 UsualUnaryConversions(rex); 2270 2271 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2272 return Context.IntTy; 2273 return InvalidOperands(loc, lex, rex); 2274} 2275 2276inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 2277 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 2278{ 2279 QualType lhsType = lex->getType(); 2280 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 2281 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(Context); 2282 2283 switch (mlval) { // C99 6.5.16p2 2284 case Expr::MLV_Valid: 2285 break; 2286 case Expr::MLV_ConstQualified: 2287 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 2288 return QualType(); 2289 case Expr::MLV_ArrayType: 2290 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 2291 lhsType.getAsString(), lex->getSourceRange()); 2292 return QualType(); 2293 case Expr::MLV_NotObjectType: 2294 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 2295 lhsType.getAsString(), lex->getSourceRange()); 2296 return QualType(); 2297 case Expr::MLV_InvalidExpression: 2298 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 2299 lex->getSourceRange()); 2300 return QualType(); 2301 case Expr::MLV_IncompleteType: 2302 case Expr::MLV_IncompleteVoidType: 2303 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 2304 lhsType.getAsString(), lex->getSourceRange()); 2305 return QualType(); 2306 case Expr::MLV_DuplicateVectorComponents: 2307 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 2308 lex->getSourceRange()); 2309 return QualType(); 2310 case Expr::MLV_NotBlockQualified: 2311 Diag(loc, diag::err_block_decl_ref_not_modifiable_lvalue, 2312 lex->getSourceRange()); 2313 return QualType(); 2314 } 2315 2316 AssignConvertType ConvTy; 2317 if (compoundType.isNull()) { 2318 // Simple assignment "x = y". 2319 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 2320 2321 // If the RHS is a unary plus or minus, check to see if they = and + are 2322 // right next to each other. If so, the user may have typo'd "x =+ 4" 2323 // instead of "x += 4". 2324 Expr *RHSCheck = rex; 2325 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2326 RHSCheck = ICE->getSubExpr(); 2327 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2328 if ((UO->getOpcode() == UnaryOperator::Plus || 2329 UO->getOpcode() == UnaryOperator::Minus) && 2330 loc.isFileID() && UO->getOperatorLoc().isFileID() && 2331 // Only if the two operators are exactly adjacent. 2332 loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2333 Diag(loc, diag::warn_not_compound_assign, 2334 UO->getOpcode() == UnaryOperator::Plus ? "+" : "-", 2335 SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc())); 2336 } 2337 } else { 2338 // Compound assignment "x += y" 2339 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 2340 } 2341 2342 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 2343 rex, "assigning")) 2344 return QualType(); 2345 2346 // C99 6.5.16p3: The type of an assignment expression is the type of the 2347 // left operand unless the left operand has qualified type, in which case 2348 // it is the unqualified version of the type of the left operand. 2349 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2350 // is converted to the type of the assignment expression (above). 2351 // C++ 5.17p1: the type of the assignment expression is that of its left 2352 // oprdu. 2353 return lhsType.getUnqualifiedType(); 2354} 2355 2356inline QualType Sema::CheckCommaOperands( // C99 6.5.17 2357 Expr *&lex, Expr *&rex, SourceLocation loc) { 2358 2359 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2360 DefaultFunctionArrayConversion(rex); 2361 return rex->getType(); 2362} 2363 2364/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2365/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2366QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 2367 QualType resType = op->getType(); 2368 assert(!resType.isNull() && "no type for increment/decrement expression"); 2369 2370 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2371 if (const PointerType *pt = resType->getAsPointerType()) { 2372 if (pt->getPointeeType()->isVoidType()) { 2373 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 2374 } else if (!pt->getPointeeType()->isObjectType()) { 2375 // C99 6.5.2.4p2, 6.5.6p2 2376 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 2377 resType.getAsString(), op->getSourceRange()); 2378 return QualType(); 2379 } 2380 } else if (!resType->isRealType()) { 2381 if (resType->isComplexType()) 2382 // C99 does not support ++/-- on complex types. 2383 Diag(OpLoc, diag::ext_integer_increment_complex, 2384 resType.getAsString(), op->getSourceRange()); 2385 else { 2386 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 2387 resType.getAsString(), op->getSourceRange()); 2388 return QualType(); 2389 } 2390 } 2391 // At this point, we know we have a real, complex or pointer type. 2392 // Now make sure the operand is a modifiable lvalue. 2393 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(Context); 2394 if (mlval != Expr::MLV_Valid) { 2395 // FIXME: emit a more precise diagnostic... 2396 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 2397 op->getSourceRange()); 2398 return QualType(); 2399 } 2400 return resType; 2401} 2402 2403/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2404/// This routine allows us to typecheck complex/recursive expressions 2405/// where the declaration is needed for type checking. We only need to 2406/// handle cases when the expression references a function designator 2407/// or is an lvalue. Here are some examples: 2408/// - &(x) => x 2409/// - &*****f => f for f a function designator. 2410/// - &s.xx => s 2411/// - &s.zz[1].yy -> s, if zz is an array 2412/// - *(x + 1) -> x, if x is an array 2413/// - &"123"[2] -> 0 2414/// - & __real__ x -> x 2415static NamedDecl *getPrimaryDecl(Expr *E) { 2416 switch (E->getStmtClass()) { 2417 case Stmt::DeclRefExprClass: 2418 return cast<DeclRefExpr>(E)->getDecl(); 2419 case Stmt::MemberExprClass: 2420 // Fields cannot be declared with a 'register' storage class. 2421 // &X->f is always ok, even if X is declared register. 2422 if (cast<MemberExpr>(E)->isArrow()) 2423 return 0; 2424 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2425 case Stmt::ArraySubscriptExprClass: { 2426 // &X[4] and &4[X] refers to X if X is not a pointer. 2427 2428 NamedDecl *D = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2429 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(D); 2430 if (!VD || VD->getType()->isPointerType()) 2431 return 0; 2432 else 2433 return VD; 2434 } 2435 case Stmt::UnaryOperatorClass: { 2436 UnaryOperator *UO = cast<UnaryOperator>(E); 2437 2438 switch(UO->getOpcode()) { 2439 case UnaryOperator::Deref: { 2440 // *(X + 1) refers to X if X is not a pointer. 2441 if (NamedDecl *D = getPrimaryDecl(UO->getSubExpr())) { 2442 ValueDecl *VD = dyn_cast<ValueDecl>(D); 2443 if (!VD || VD->getType()->isPointerType()) 2444 return 0; 2445 return VD; 2446 } 2447 return 0; 2448 } 2449 case UnaryOperator::Real: 2450 case UnaryOperator::Imag: 2451 case UnaryOperator::Extension: 2452 return getPrimaryDecl(UO->getSubExpr()); 2453 default: 2454 return 0; 2455 } 2456 } 2457 case Stmt::BinaryOperatorClass: { 2458 BinaryOperator *BO = cast<BinaryOperator>(E); 2459 2460 // Handle cases involving pointer arithmetic. The result of an 2461 // Assign or AddAssign is not an lvalue so they can be ignored. 2462 2463 // (x + n) or (n + x) => x 2464 if (BO->getOpcode() == BinaryOperator::Add) { 2465 if (BO->getLHS()->getType()->isPointerType()) { 2466 return getPrimaryDecl(BO->getLHS()); 2467 } else if (BO->getRHS()->getType()->isPointerType()) { 2468 return getPrimaryDecl(BO->getRHS()); 2469 } 2470 } 2471 2472 return 0; 2473 } 2474 case Stmt::ParenExprClass: 2475 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2476 case Stmt::ImplicitCastExprClass: 2477 // &X[4] when X is an array, has an implicit cast from array to pointer. 2478 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2479 default: 2480 return 0; 2481 } 2482} 2483 2484/// CheckAddressOfOperand - The operand of & must be either a function 2485/// designator or an lvalue designating an object. If it is an lvalue, the 2486/// object cannot be declared with storage class register or be a bit field. 2487/// Note: The usual conversions are *not* applied to the operand of the & 2488/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2489QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2490 if (getLangOptions().C99) { 2491 // Implement C99-only parts of addressof rules. 2492 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2493 if (uOp->getOpcode() == UnaryOperator::Deref) 2494 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2495 // (assuming the deref expression is valid). 2496 return uOp->getSubExpr()->getType(); 2497 } 2498 // Technically, there should be a check for array subscript 2499 // expressions here, but the result of one is always an lvalue anyway. 2500 } 2501 NamedDecl *dcl = getPrimaryDecl(op); 2502 Expr::isLvalueResult lval = op->isLvalue(Context); 2503 2504 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2505 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2506 // FIXME: emit more specific diag... 2507 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 2508 op->getSourceRange()); 2509 return QualType(); 2510 } 2511 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2512 if (MemExpr->getMemberDecl()->isBitField()) { 2513 Diag(OpLoc, diag::err_typecheck_address_of, 2514 std::string("bit-field"), op->getSourceRange()); 2515 return QualType(); 2516 } 2517 // Check for Apple extension for accessing vector components. 2518 } else if (isa<ArraySubscriptExpr>(op) && 2519 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2520 Diag(OpLoc, diag::err_typecheck_address_of, 2521 std::string("vector"), op->getSourceRange()); 2522 return QualType(); 2523 } else if (dcl) { // C99 6.5.3.2p1 2524 // We have an lvalue with a decl. Make sure the decl is not declared 2525 // with the register storage-class specifier. 2526 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2527 if (vd->getStorageClass() == VarDecl::Register) { 2528 Diag(OpLoc, diag::err_typecheck_address_of, 2529 std::string("register variable"), op->getSourceRange()); 2530 return QualType(); 2531 } 2532 } else 2533 assert(0 && "Unknown/unexpected decl type"); 2534 } 2535 2536 // If the operand has type "type", the result has type "pointer to type". 2537 return Context.getPointerType(op->getType()); 2538} 2539 2540QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 2541 UsualUnaryConversions(op); 2542 QualType qType = op->getType(); 2543 2544 if (const PointerType *PT = qType->getAsPointerType()) { 2545 // Note that per both C89 and C99, this is always legal, even 2546 // if ptype is an incomplete type or void. 2547 // It would be possible to warn about dereferencing a 2548 // void pointer, but it's completely well-defined, 2549 // and such a warning is unlikely to catch any mistakes. 2550 return PT->getPointeeType(); 2551 } 2552 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 2553 qType.getAsString(), op->getSourceRange()); 2554 return QualType(); 2555} 2556 2557static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2558 tok::TokenKind Kind) { 2559 BinaryOperator::Opcode Opc; 2560 switch (Kind) { 2561 default: assert(0 && "Unknown binop!"); 2562 case tok::star: Opc = BinaryOperator::Mul; break; 2563 case tok::slash: Opc = BinaryOperator::Div; break; 2564 case tok::percent: Opc = BinaryOperator::Rem; break; 2565 case tok::plus: Opc = BinaryOperator::Add; break; 2566 case tok::minus: Opc = BinaryOperator::Sub; break; 2567 case tok::lessless: Opc = BinaryOperator::Shl; break; 2568 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2569 case tok::lessequal: Opc = BinaryOperator::LE; break; 2570 case tok::less: Opc = BinaryOperator::LT; break; 2571 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2572 case tok::greater: Opc = BinaryOperator::GT; break; 2573 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2574 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2575 case tok::amp: Opc = BinaryOperator::And; break; 2576 case tok::caret: Opc = BinaryOperator::Xor; break; 2577 case tok::pipe: Opc = BinaryOperator::Or; break; 2578 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2579 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2580 case tok::equal: Opc = BinaryOperator::Assign; break; 2581 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2582 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2583 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2584 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2585 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2586 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2587 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2588 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2589 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2590 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2591 case tok::comma: Opc = BinaryOperator::Comma; break; 2592 } 2593 return Opc; 2594} 2595 2596static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2597 tok::TokenKind Kind) { 2598 UnaryOperator::Opcode Opc; 2599 switch (Kind) { 2600 default: assert(0 && "Unknown unary op!"); 2601 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2602 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2603 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2604 case tok::star: Opc = UnaryOperator::Deref; break; 2605 case tok::plus: Opc = UnaryOperator::Plus; break; 2606 case tok::minus: Opc = UnaryOperator::Minus; break; 2607 case tok::tilde: Opc = UnaryOperator::Not; break; 2608 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2609 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 2610 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 2611 case tok::kw___real: Opc = UnaryOperator::Real; break; 2612 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2613 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2614 } 2615 return Opc; 2616} 2617 2618// Binary Operators. 'Tok' is the token for the operator. 2619Action::ExprResult Sema::ActOnBinOp(SourceLocation TokLoc, tok::TokenKind Kind, 2620 ExprTy *LHS, ExprTy *RHS) { 2621 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 2622 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 2623 2624 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 2625 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 2626 2627 QualType ResultTy; // Result type of the binary operator. 2628 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2629 2630 switch (Opc) { 2631 default: 2632 assert(0 && "Unknown binary expr!"); 2633 case BinaryOperator::Assign: 2634 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, QualType()); 2635 break; 2636 case BinaryOperator::Mul: 2637 case BinaryOperator::Div: 2638 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc); 2639 break; 2640 case BinaryOperator::Rem: 2641 ResultTy = CheckRemainderOperands(lhs, rhs, TokLoc); 2642 break; 2643 case BinaryOperator::Add: 2644 ResultTy = CheckAdditionOperands(lhs, rhs, TokLoc); 2645 break; 2646 case BinaryOperator::Sub: 2647 ResultTy = CheckSubtractionOperands(lhs, rhs, TokLoc); 2648 break; 2649 case BinaryOperator::Shl: 2650 case BinaryOperator::Shr: 2651 ResultTy = CheckShiftOperands(lhs, rhs, TokLoc); 2652 break; 2653 case BinaryOperator::LE: 2654 case BinaryOperator::LT: 2655 case BinaryOperator::GE: 2656 case BinaryOperator::GT: 2657 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, true); 2658 break; 2659 case BinaryOperator::EQ: 2660 case BinaryOperator::NE: 2661 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, false); 2662 break; 2663 case BinaryOperator::And: 2664 case BinaryOperator::Xor: 2665 case BinaryOperator::Or: 2666 ResultTy = CheckBitwiseOperands(lhs, rhs, TokLoc); 2667 break; 2668 case BinaryOperator::LAnd: 2669 case BinaryOperator::LOr: 2670 ResultTy = CheckLogicalOperands(lhs, rhs, TokLoc); 2671 break; 2672 case BinaryOperator::MulAssign: 2673 case BinaryOperator::DivAssign: 2674 CompTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc, true); 2675 if (!CompTy.isNull()) 2676 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2677 break; 2678 case BinaryOperator::RemAssign: 2679 CompTy = CheckRemainderOperands(lhs, rhs, TokLoc, true); 2680 if (!CompTy.isNull()) 2681 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2682 break; 2683 case BinaryOperator::AddAssign: 2684 CompTy = CheckAdditionOperands(lhs, rhs, TokLoc, true); 2685 if (!CompTy.isNull()) 2686 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2687 break; 2688 case BinaryOperator::SubAssign: 2689 CompTy = CheckSubtractionOperands(lhs, rhs, TokLoc, true); 2690 if (!CompTy.isNull()) 2691 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2692 break; 2693 case BinaryOperator::ShlAssign: 2694 case BinaryOperator::ShrAssign: 2695 CompTy = CheckShiftOperands(lhs, rhs, TokLoc, true); 2696 if (!CompTy.isNull()) 2697 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2698 break; 2699 case BinaryOperator::AndAssign: 2700 case BinaryOperator::XorAssign: 2701 case BinaryOperator::OrAssign: 2702 CompTy = CheckBitwiseOperands(lhs, rhs, TokLoc, true); 2703 if (!CompTy.isNull()) 2704 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2705 break; 2706 case BinaryOperator::Comma: 2707 ResultTy = CheckCommaOperands(lhs, rhs, TokLoc); 2708 break; 2709 } 2710 if (ResultTy.isNull()) 2711 return true; 2712 if (CompTy.isNull()) 2713 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 2714 else 2715 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, TokLoc); 2716} 2717 2718// Unary Operators. 'Tok' is the token for the operator. 2719Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2720 ExprTy *input) { 2721 Expr *Input = (Expr*)input; 2722 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2723 QualType resultType; 2724 switch (Opc) { 2725 default: 2726 assert(0 && "Unimplemented unary expr!"); 2727 case UnaryOperator::PreInc: 2728 case UnaryOperator::PreDec: 2729 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2730 break; 2731 case UnaryOperator::AddrOf: 2732 resultType = CheckAddressOfOperand(Input, OpLoc); 2733 break; 2734 case UnaryOperator::Deref: 2735 DefaultFunctionArrayConversion(Input); 2736 resultType = CheckIndirectionOperand(Input, OpLoc); 2737 break; 2738 case UnaryOperator::Plus: 2739 case UnaryOperator::Minus: 2740 UsualUnaryConversions(Input); 2741 resultType = Input->getType(); 2742 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2743 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2744 resultType.getAsString()); 2745 break; 2746 case UnaryOperator::Not: // bitwise complement 2747 UsualUnaryConversions(Input); 2748 resultType = Input->getType(); 2749 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 2750 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 2751 // C99 does not support '~' for complex conjugation. 2752 Diag(OpLoc, diag::ext_integer_complement_complex, 2753 resultType.getAsString(), Input->getSourceRange()); 2754 else if (!resultType->isIntegerType()) 2755 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2756 resultType.getAsString(), Input->getSourceRange()); 2757 break; 2758 case UnaryOperator::LNot: // logical negation 2759 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2760 DefaultFunctionArrayConversion(Input); 2761 resultType = Input->getType(); 2762 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2763 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2764 resultType.getAsString()); 2765 // LNot always has type int. C99 6.5.3.3p5. 2766 resultType = Context.IntTy; 2767 break; 2768 case UnaryOperator::SizeOf: 2769 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2770 Input->getSourceRange(), true); 2771 break; 2772 case UnaryOperator::AlignOf: 2773 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2774 Input->getSourceRange(), false); 2775 break; 2776 case UnaryOperator::Real: 2777 case UnaryOperator::Imag: 2778 resultType = CheckRealImagOperand(Input, OpLoc); 2779 break; 2780 case UnaryOperator::Extension: 2781 resultType = Input->getType(); 2782 break; 2783 } 2784 if (resultType.isNull()) 2785 return true; 2786 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2787} 2788 2789/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2790Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2791 SourceLocation LabLoc, 2792 IdentifierInfo *LabelII) { 2793 // Look up the record for this label identifier. 2794 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2795 2796 // If we haven't seen this label yet, create a forward reference. It 2797 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 2798 if (LabelDecl == 0) 2799 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2800 2801 // Create the AST node. The address of a label always has type 'void*'. 2802 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2803 Context.getPointerType(Context.VoidTy)); 2804} 2805 2806Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2807 SourceLocation RPLoc) { // "({..})" 2808 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2809 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2810 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2811 2812 // FIXME: there are a variety of strange constraints to enforce here, for 2813 // example, it is not possible to goto into a stmt expression apparently. 2814 // More semantic analysis is needed. 2815 2816 // FIXME: the last statement in the compount stmt has its value used. We 2817 // should not warn about it being unused. 2818 2819 // If there are sub stmts in the compound stmt, take the type of the last one 2820 // as the type of the stmtexpr. 2821 QualType Ty = Context.VoidTy; 2822 2823 if (!Compound->body_empty()) { 2824 Stmt *LastStmt = Compound->body_back(); 2825 // If LastStmt is a label, skip down through into the body. 2826 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 2827 LastStmt = Label->getSubStmt(); 2828 2829 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 2830 Ty = LastExpr->getType(); 2831 } 2832 2833 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2834} 2835 2836Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2837 SourceLocation TypeLoc, 2838 TypeTy *argty, 2839 OffsetOfComponent *CompPtr, 2840 unsigned NumComponents, 2841 SourceLocation RPLoc) { 2842 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2843 assert(!ArgTy.isNull() && "Missing type argument!"); 2844 2845 // We must have at least one component that refers to the type, and the first 2846 // one is known to be a field designator. Verify that the ArgTy represents 2847 // a struct/union/class. 2848 if (!ArgTy->isRecordType()) 2849 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2850 2851 // Otherwise, create a compound literal expression as the base, and 2852 // iteratively process the offsetof designators. 2853 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2854 2855 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2856 // GCC extension, diagnose them. 2857 if (NumComponents != 1) 2858 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2859 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2860 2861 for (unsigned i = 0; i != NumComponents; ++i) { 2862 const OffsetOfComponent &OC = CompPtr[i]; 2863 if (OC.isBrackets) { 2864 // Offset of an array sub-field. TODO: Should we allow vector elements? 2865 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 2866 if (!AT) { 2867 delete Res; 2868 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 2869 Res->getType().getAsString()); 2870 } 2871 2872 // FIXME: C++: Verify that operator[] isn't overloaded. 2873 2874 // C99 6.5.2.1p1 2875 Expr *Idx = static_cast<Expr*>(OC.U.E); 2876 if (!Idx->getType()->isIntegerType()) 2877 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 2878 Idx->getSourceRange()); 2879 2880 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 2881 continue; 2882 } 2883 2884 const RecordType *RC = Res->getType()->getAsRecordType(); 2885 if (!RC) { 2886 delete Res; 2887 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 2888 Res->getType().getAsString()); 2889 } 2890 2891 // Get the decl corresponding to this. 2892 RecordDecl *RD = RC->getDecl(); 2893 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 2894 if (!MemberDecl) 2895 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 2896 OC.U.IdentInfo->getName(), 2897 SourceRange(OC.LocStart, OC.LocEnd)); 2898 2899 // FIXME: C++: Verify that MemberDecl isn't a static field. 2900 // FIXME: Verify that MemberDecl isn't a bitfield. 2901 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 2902 // matter here. 2903 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, MemberDecl->getType()); 2904 } 2905 2906 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 2907 BuiltinLoc); 2908} 2909 2910 2911Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 2912 TypeTy *arg1, TypeTy *arg2, 2913 SourceLocation RPLoc) { 2914 QualType argT1 = QualType::getFromOpaquePtr(arg1); 2915 QualType argT2 = QualType::getFromOpaquePtr(arg2); 2916 2917 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 2918 2919 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 2920} 2921 2922Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 2923 ExprTy *expr1, ExprTy *expr2, 2924 SourceLocation RPLoc) { 2925 Expr *CondExpr = static_cast<Expr*>(cond); 2926 Expr *LHSExpr = static_cast<Expr*>(expr1); 2927 Expr *RHSExpr = static_cast<Expr*>(expr2); 2928 2929 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 2930 2931 // The conditional expression is required to be a constant expression. 2932 llvm::APSInt condEval(32); 2933 SourceLocation ExpLoc; 2934 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 2935 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 2936 CondExpr->getSourceRange()); 2937 2938 // If the condition is > zero, then the AST type is the same as the LSHExpr. 2939 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 2940 RHSExpr->getType(); 2941 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 2942} 2943 2944//===----------------------------------------------------------------------===// 2945// Clang Extensions. 2946//===----------------------------------------------------------------------===// 2947 2948/// ActOnBlockStart - This callback is invoked when a block literal is started. 2949void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 2950 // Analyze block parameters. 2951 BlockSemaInfo *BSI = new BlockSemaInfo(); 2952 2953 // Add BSI to CurBlock. 2954 BSI->PrevBlockInfo = CurBlock; 2955 CurBlock = BSI; 2956 2957 BSI->ReturnType = 0; 2958 BSI->TheScope = BlockScope; 2959 2960 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 2961 PushDeclContext(BSI->TheDecl); 2962} 2963 2964void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 2965 // Analyze arguments to block. 2966 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 2967 "Not a function declarator!"); 2968 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 2969 2970 CurBlock->hasPrototype = FTI.hasPrototype; 2971 CurBlock->isVariadic = true; 2972 2973 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 2974 // no arguments, not a function that takes a single void argument. 2975 if (FTI.hasPrototype && 2976 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2977 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 2978 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 2979 // empty arg list, don't push any params. 2980 CurBlock->isVariadic = false; 2981 } else if (FTI.hasPrototype) { 2982 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 2983 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 2984 CurBlock->isVariadic = FTI.isVariadic; 2985 } 2986 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 2987 2988 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 2989 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 2990 // If this has an identifier, add it to the scope stack. 2991 if ((*AI)->getIdentifier()) 2992 PushOnScopeChains(*AI, CurBlock->TheScope); 2993} 2994 2995/// ActOnBlockError - If there is an error parsing a block, this callback 2996/// is invoked to pop the information about the block from the action impl. 2997void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 2998 // Ensure that CurBlock is deleted. 2999 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 3000 3001 // Pop off CurBlock, handle nested blocks. 3002 CurBlock = CurBlock->PrevBlockInfo; 3003 3004 // FIXME: Delete the ParmVarDecl objects as well??? 3005 3006} 3007 3008/// ActOnBlockStmtExpr - This is called when the body of a block statement 3009/// literal was successfully completed. ^(int x){...} 3010Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 3011 Scope *CurScope) { 3012 // Ensure that CurBlock is deleted. 3013 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 3014 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 3015 3016 PopDeclContext(); 3017 3018 // Pop off CurBlock, handle nested blocks. 3019 CurBlock = CurBlock->PrevBlockInfo; 3020 3021 QualType RetTy = Context.VoidTy; 3022 if (BSI->ReturnType) 3023 RetTy = QualType(BSI->ReturnType, 0); 3024 3025 llvm::SmallVector<QualType, 8> ArgTypes; 3026 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 3027 ArgTypes.push_back(BSI->Params[i]->getType()); 3028 3029 QualType BlockTy; 3030 if (!BSI->hasPrototype) 3031 BlockTy = Context.getFunctionTypeNoProto(RetTy); 3032 else 3033 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 3034 BSI->isVariadic); 3035 3036 BlockTy = Context.getBlockPointerType(BlockTy); 3037 3038 BSI->TheDecl->setBody(Body.take()); 3039 return new BlockExpr(BSI->TheDecl, BlockTy); 3040} 3041 3042/// ExprsMatchFnType - return true if the Exprs in array Args have 3043/// QualTypes that match the QualTypes of the arguments of the FnType. 3044/// The number of arguments has already been validated to match the number of 3045/// arguments in FnType. 3046static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 3047 ASTContext &Context) { 3048 unsigned NumParams = FnType->getNumArgs(); 3049 for (unsigned i = 0; i != NumParams; ++i) { 3050 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 3051 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 3052 3053 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 3054 return false; 3055 } 3056 return true; 3057} 3058 3059Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 3060 SourceLocation *CommaLocs, 3061 SourceLocation BuiltinLoc, 3062 SourceLocation RParenLoc) { 3063 // __builtin_overload requires at least 2 arguments 3064 if (NumArgs < 2) 3065 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3066 SourceRange(BuiltinLoc, RParenLoc)); 3067 3068 // The first argument is required to be a constant expression. It tells us 3069 // the number of arguments to pass to each of the functions to be overloaded. 3070 Expr **Args = reinterpret_cast<Expr**>(args); 3071 Expr *NParamsExpr = Args[0]; 3072 llvm::APSInt constEval(32); 3073 SourceLocation ExpLoc; 3074 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 3075 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3076 NParamsExpr->getSourceRange()); 3077 3078 // Verify that the number of parameters is > 0 3079 unsigned NumParams = constEval.getZExtValue(); 3080 if (NumParams == 0) 3081 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 3082 NParamsExpr->getSourceRange()); 3083 // Verify that we have at least 1 + NumParams arguments to the builtin. 3084 if ((NumParams + 1) > NumArgs) 3085 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 3086 SourceRange(BuiltinLoc, RParenLoc)); 3087 3088 // Figure out the return type, by matching the args to one of the functions 3089 // listed after the parameters. 3090 OverloadExpr *OE = 0; 3091 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 3092 // UsualUnaryConversions will convert the function DeclRefExpr into a 3093 // pointer to function. 3094 Expr *Fn = UsualUnaryConversions(Args[i]); 3095 const FunctionTypeProto *FnType = 0; 3096 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3097 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3098 3099 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3100 // parameters, and the number of parameters must match the value passed to 3101 // the builtin. 3102 if (!FnType || (FnType->getNumArgs() != NumParams)) 3103 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 3104 Fn->getSourceRange()); 3105 3106 // Scan the parameter list for the FunctionType, checking the QualType of 3107 // each parameter against the QualTypes of the arguments to the builtin. 3108 // If they match, return a new OverloadExpr. 3109 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3110 if (OE) 3111 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 3112 OE->getFn()->getSourceRange()); 3113 // Remember our match, and continue processing the remaining arguments 3114 // to catch any errors. 3115 OE = new OverloadExpr(Args, NumArgs, i, FnType->getResultType(), 3116 BuiltinLoc, RParenLoc); 3117 } 3118 } 3119 // Return the newly created OverloadExpr node, if we succeded in matching 3120 // exactly one of the candidate functions. 3121 if (OE) 3122 return OE; 3123 3124 // If we didn't find a matching function Expr in the __builtin_overload list 3125 // the return an error. 3126 std::string typeNames; 3127 for (unsigned i = 0; i != NumParams; ++i) { 3128 if (i != 0) typeNames += ", "; 3129 typeNames += Args[i+1]->getType().getAsString(); 3130 } 3131 3132 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 3133 SourceRange(BuiltinLoc, RParenLoc)); 3134} 3135 3136Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3137 ExprTy *expr, TypeTy *type, 3138 SourceLocation RPLoc) { 3139 Expr *E = static_cast<Expr*>(expr); 3140 QualType T = QualType::getFromOpaquePtr(type); 3141 3142 InitBuiltinVaListType(); 3143 3144 // Get the va_list type 3145 QualType VaListType = Context.getBuiltinVaListType(); 3146 // Deal with implicit array decay; for example, on x86-64, 3147 // va_list is an array, but it's supposed to decay to 3148 // a pointer for va_arg. 3149 if (VaListType->isArrayType()) 3150 VaListType = Context.getArrayDecayedType(VaListType); 3151 // Make sure the input expression also decays appropriately. 3152 UsualUnaryConversions(E); 3153 3154 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3155 return Diag(E->getLocStart(), 3156 diag::err_first_argument_to_va_arg_not_of_type_va_list, 3157 E->getType().getAsString(), 3158 E->getSourceRange()); 3159 3160 // FIXME: Warn if a non-POD type is passed in. 3161 3162 return new VAArgExpr(BuiltinLoc, E, T, RPLoc); 3163} 3164 3165bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3166 SourceLocation Loc, 3167 QualType DstType, QualType SrcType, 3168 Expr *SrcExpr, const char *Flavor) { 3169 // Decode the result (notice that AST's are still created for extensions). 3170 bool isInvalid = false; 3171 unsigned DiagKind; 3172 switch (ConvTy) { 3173 default: assert(0 && "Unknown conversion type"); 3174 case Compatible: return false; 3175 case PointerToInt: 3176 DiagKind = diag::ext_typecheck_convert_pointer_int; 3177 break; 3178 case IntToPointer: 3179 DiagKind = diag::ext_typecheck_convert_int_pointer; 3180 break; 3181 case IncompatiblePointer: 3182 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3183 break; 3184 case FunctionVoidPointer: 3185 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3186 break; 3187 case CompatiblePointerDiscardsQualifiers: 3188 // If the qualifiers lost were because we were applying the 3189 // (deprecated) C++ conversion from a string literal to a char* 3190 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3191 // Ideally, this check would be performed in 3192 // CheckPointerTypesForAssignment. However, that would require a 3193 // bit of refactoring (so that the second argument is an 3194 // expression, rather than a type), which should be done as part 3195 // of a larger effort to fix CheckPointerTypesForAssignment for 3196 // C++ semantics. 3197 if (getLangOptions().CPlusPlus && 3198 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3199 return false; 3200 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3201 break; 3202 case IntToBlockPointer: 3203 DiagKind = diag::err_int_to_block_pointer; 3204 break; 3205 case IncompatibleBlockPointer: 3206 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3207 break; 3208 case BlockVoidPointer: 3209 DiagKind = diag::ext_typecheck_convert_pointer_void_block; 3210 break; 3211 case IncompatibleObjCQualifiedId: 3212 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3213 // it can give a more specific diagnostic. 3214 DiagKind = diag::warn_incompatible_qualified_id; 3215 break; 3216 case Incompatible: 3217 DiagKind = diag::err_typecheck_convert_incompatible; 3218 isInvalid = true; 3219 break; 3220 } 3221 3222 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 3223 SrcExpr->getSourceRange()); 3224 return isInvalid; 3225} 3226