SemaExpr.cpp revision b2ebd48fc5253fa67d29d789ce55d4a921c29bf1
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 // FIXME: Use DeclRefExpr or a new Expr for a direct CXXField reference. 406 ExprResult ThisExpr = ActOnCXXThis(SourceLocation()); 407 return new MemberExpr(static_cast<Expr*>(ThisExpr.Val), 408 true, FD, Loc, FD->getType()); 409 } 410 411 return Diag(Loc, diag::err_invalid_non_static_member_use, FD->getName()); 412 } 413 if (isa<TypedefDecl>(D)) 414 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 415 if (isa<ObjCInterfaceDecl>(D)) 416 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 417 if (isa<NamespaceDecl>(D)) 418 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 419 420 // Make the DeclRefExpr or BlockDeclRefExpr for the decl. 421 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(), 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 if (Getter) { 978 // If we found a getter then this may be a valid dot-reference, we 979 // need to also look for the matching setter. 980 IdentifierInfo *SetterName = constructSetterName(PP.getIdentifierTable(), 981 &Member); 982 Selector SetterSel = PP.getSelectorTable().getUnarySelector(SetterName); 983 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 984 985 if (!Setter) { 986 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 987 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 988 if (ObjCImplementationDecl *ImpDecl = 989 ObjCImplementations[ClassDecl->getIdentifier()]) 990 Setter = ImpDecl->getInstanceMethod(SetterSel); 991 } 992 993 // FIXME: There are some issues here. First, we are not 994 // diagnosing accesses to read-only properties because we do not 995 // know if this is a getter or setter yet. Second, we are 996 // checking that the type of the setter matches the type we 997 // expect. 998 return new ObjCPropertyRefExpr(Getter, Setter, Getter->getResultType(), 999 MemberLoc, BaseExpr); 1000 } 1001 } 1002 1003 // Handle 'field access' to vectors, such as 'V.xx'. 1004 if (BaseType->isExtVectorType() && OpKind == tok::period) { 1005 // Component access limited to variables (reject vec4.rg.g). 1006 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 1007 !isa<ExtVectorElementExpr>(BaseExpr)) 1008 return Diag(MemberLoc, diag::err_ext_vector_component_access, 1009 BaseExpr->getSourceRange()); 1010 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 1011 if (ret.isNull()) 1012 return true; 1013 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 1014 } 1015 1016 return Diag(MemberLoc, diag::err_typecheck_member_reference_struct_union, 1017 BaseType.getAsString(), BaseExpr->getSourceRange()); 1018} 1019 1020/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 1021/// This provides the location of the left/right parens and a list of comma 1022/// locations. 1023Action::ExprResult Sema:: 1024ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 1025 ExprTy **args, unsigned NumArgs, 1026 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 1027 Expr *Fn = static_cast<Expr *>(fn); 1028 Expr **Args = reinterpret_cast<Expr**>(args); 1029 assert(Fn && "no function call expression"); 1030 FunctionDecl *FDecl = NULL; 1031 1032 // Promote the function operand. 1033 UsualUnaryConversions(Fn); 1034 1035 // If we're directly calling a function, get the declaration for 1036 // that function. 1037 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 1038 if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr())) 1039 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 1040 1041 // Make the call expr early, before semantic checks. This guarantees cleanup 1042 // of arguments and function on error. 1043 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 1044 Context.BoolTy, RParenLoc)); 1045 const FunctionType *FuncT; 1046 if (!Fn->getType()->isBlockPointerType()) { 1047 // C99 6.5.2.2p1 - "The expression that denotes the called function shall 1048 // have type pointer to function". 1049 const PointerType *PT = Fn->getType()->getAsPointerType(); 1050 if (PT == 0) 1051 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1052 Fn->getSourceRange()); 1053 FuncT = PT->getPointeeType()->getAsFunctionType(); 1054 } else { // This is a block call. 1055 FuncT = Fn->getType()->getAsBlockPointerType()->getPointeeType()-> 1056 getAsFunctionType(); 1057 } 1058 if (FuncT == 0) 1059 return Diag(LParenLoc, diag::err_typecheck_call_not_function, 1060 Fn->getSourceRange()); 1061 1062 // We know the result type of the call, set it. 1063 TheCall->setType(FuncT->getResultType()); 1064 1065 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 1066 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 1067 // assignment, to the types of the corresponding parameter, ... 1068 unsigned NumArgsInProto = Proto->getNumArgs(); 1069 unsigned NumArgsToCheck = NumArgs; 1070 1071 // If too few arguments are available (and we don't have default 1072 // arguments for the remaining parameters), don't make the call. 1073 if (NumArgs < NumArgsInProto) { 1074 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 1075 // Use default arguments for missing arguments 1076 NumArgsToCheck = NumArgsInProto; 1077 TheCall->setNumArgs(NumArgsInProto); 1078 } else 1079 return Diag(RParenLoc, 1080 !Fn->getType()->isBlockPointerType() 1081 ? diag::err_typecheck_call_too_few_args 1082 : diag::err_typecheck_block_too_few_args, 1083 Fn->getSourceRange()); 1084 } 1085 1086 // If too many are passed and not variadic, error on the extras and drop 1087 // them. 1088 if (NumArgs > NumArgsInProto) { 1089 if (!Proto->isVariadic()) { 1090 Diag(Args[NumArgsInProto]->getLocStart(), 1091 !Fn->getType()->isBlockPointerType() 1092 ? diag::err_typecheck_call_too_many_args 1093 : diag::err_typecheck_block_too_many_args, 1094 Fn->getSourceRange(), 1095 SourceRange(Args[NumArgsInProto]->getLocStart(), 1096 Args[NumArgs-1]->getLocEnd())); 1097 // This deletes the extra arguments. 1098 TheCall->setNumArgs(NumArgsInProto); 1099 } 1100 NumArgsToCheck = NumArgsInProto; 1101 } 1102 1103 // Continue to check argument types (even if we have too few/many args). 1104 for (unsigned i = 0; i != NumArgsToCheck; i++) { 1105 QualType ProtoArgType = Proto->getArgType(i); 1106 1107 Expr *Arg; 1108 if (i < NumArgs) 1109 Arg = Args[i]; 1110 else 1111 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 1112 QualType ArgType = Arg->getType(); 1113 1114 // Compute implicit casts from the operand to the formal argument type. 1115 AssignConvertType ConvTy = 1116 CheckSingleAssignmentConstraints(ProtoArgType, Arg); 1117 TheCall->setArg(i, Arg); 1118 1119 if (DiagnoseAssignmentResult(ConvTy, Arg->getLocStart(), ProtoArgType, 1120 ArgType, Arg, "passing")) 1121 return true; 1122 } 1123 1124 // If this is a variadic call, handle args passed through "...". 1125 if (Proto->isVariadic()) { 1126 // Promote the arguments (C99 6.5.2.2p7). 1127 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 1128 Expr *Arg = Args[i]; 1129 DefaultArgumentPromotion(Arg); 1130 TheCall->setArg(i, Arg); 1131 } 1132 } 1133 } else { 1134 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 1135 1136 // Promote the arguments (C99 6.5.2.2p6). 1137 for (unsigned i = 0; i != NumArgs; i++) { 1138 Expr *Arg = Args[i]; 1139 DefaultArgumentPromotion(Arg); 1140 TheCall->setArg(i, Arg); 1141 } 1142 } 1143 1144 // Do special checking on direct calls to functions. 1145 if (FDecl) 1146 return CheckFunctionCall(FDecl, TheCall.take()); 1147 1148 return TheCall.take(); 1149} 1150 1151Action::ExprResult Sema:: 1152ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 1153 SourceLocation RParenLoc, ExprTy *InitExpr) { 1154 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 1155 QualType literalType = QualType::getFromOpaquePtr(Ty); 1156 // FIXME: put back this assert when initializers are worked out. 1157 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 1158 Expr *literalExpr = static_cast<Expr*>(InitExpr); 1159 1160 if (literalType->isArrayType()) { 1161 if (literalType->isVariableArrayType()) 1162 return Diag(LParenLoc, 1163 diag::err_variable_object_no_init, 1164 SourceRange(LParenLoc, 1165 literalExpr->getSourceRange().getEnd())); 1166 } else if (literalType->isIncompleteType()) { 1167 return Diag(LParenLoc, 1168 diag::err_typecheck_decl_incomplete_type, 1169 literalType.getAsString(), 1170 SourceRange(LParenLoc, 1171 literalExpr->getSourceRange().getEnd())); 1172 } 1173 1174 if (CheckInitializerTypes(literalExpr, literalType)) 1175 return true; 1176 1177 bool isFileScope = !getCurFunctionDecl() && !getCurMethodDecl(); 1178 if (isFileScope) { // 6.5.2.5p3 1179 if (CheckForConstantInitializer(literalExpr, literalType)) 1180 return true; 1181 } 1182 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, isFileScope); 1183} 1184 1185Action::ExprResult Sema:: 1186ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 1187 SourceLocation RBraceLoc) { 1188 Expr **InitList = reinterpret_cast<Expr**>(initlist); 1189 1190 // Semantic analysis for initializers is done by ActOnDeclarator() and 1191 // CheckInitializer() - it requires knowledge of the object being intialized. 1192 1193 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc); 1194 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 1195 return E; 1196} 1197 1198/// CheckCastTypes - Check type constraints for casting between types. 1199bool Sema::CheckCastTypes(SourceRange TyR, QualType castType, Expr *&castExpr) { 1200 UsualUnaryConversions(castExpr); 1201 1202 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 1203 // type needs to be scalar. 1204 if (castType->isVoidType()) { 1205 // Cast to void allows any expr type. 1206 } else if (!castType->isScalarType() && !castType->isVectorType()) { 1207 // GCC struct/union extension: allow cast to self. 1208 if (Context.getCanonicalType(castType) != 1209 Context.getCanonicalType(castExpr->getType()) || 1210 (!castType->isStructureType() && !castType->isUnionType())) { 1211 // Reject any other conversions to non-scalar types. 1212 return Diag(TyR.getBegin(), diag::err_typecheck_cond_expect_scalar, 1213 castType.getAsString(), castExpr->getSourceRange()); 1214 } 1215 1216 // accept this, but emit an ext-warn. 1217 Diag(TyR.getBegin(), diag::ext_typecheck_cast_nonscalar, 1218 castType.getAsString(), castExpr->getSourceRange()); 1219 } else if (!castExpr->getType()->isScalarType() && 1220 !castExpr->getType()->isVectorType()) { 1221 return Diag(castExpr->getLocStart(), 1222 diag::err_typecheck_expect_scalar_operand, 1223 castExpr->getType().getAsString(),castExpr->getSourceRange()); 1224 } else if (castExpr->getType()->isVectorType()) { 1225 if (CheckVectorCast(TyR, castExpr->getType(), castType)) 1226 return true; 1227 } else if (castType->isVectorType()) { 1228 if (CheckVectorCast(TyR, castType, castExpr->getType())) 1229 return true; 1230 } 1231 return false; 1232} 1233 1234bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 1235 assert(VectorTy->isVectorType() && "Not a vector type!"); 1236 1237 if (Ty->isVectorType() || Ty->isIntegerType()) { 1238 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 1239 return Diag(R.getBegin(), 1240 Ty->isVectorType() ? 1241 diag::err_invalid_conversion_between_vectors : 1242 diag::err_invalid_conversion_between_vector_and_integer, 1243 VectorTy.getAsString().c_str(), 1244 Ty.getAsString().c_str(), R); 1245 } else 1246 return Diag(R.getBegin(), 1247 diag::err_invalid_conversion_between_vector_and_scalar, 1248 VectorTy.getAsString().c_str(), 1249 Ty.getAsString().c_str(), R); 1250 1251 return false; 1252} 1253 1254Action::ExprResult Sema:: 1255ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 1256 SourceLocation RParenLoc, ExprTy *Op) { 1257 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 1258 1259 Expr *castExpr = static_cast<Expr*>(Op); 1260 QualType castType = QualType::getFromOpaquePtr(Ty); 1261 1262 if (CheckCastTypes(SourceRange(LParenLoc, RParenLoc), castType, castExpr)) 1263 return true; 1264 return new ExplicitCastExpr(castType, castExpr, LParenLoc); 1265} 1266 1267/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 1268/// In that case, lex = cond. 1269inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 1270 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 1271 UsualUnaryConversions(cond); 1272 UsualUnaryConversions(lex); 1273 UsualUnaryConversions(rex); 1274 QualType condT = cond->getType(); 1275 QualType lexT = lex->getType(); 1276 QualType rexT = rex->getType(); 1277 1278 // first, check the condition. 1279 if (!condT->isScalarType()) { // C99 6.5.15p2 1280 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 1281 condT.getAsString()); 1282 return QualType(); 1283 } 1284 1285 // Now check the two expressions. 1286 1287 // If both operands have arithmetic type, do the usual arithmetic conversions 1288 // to find a common type: C99 6.5.15p3,5. 1289 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 1290 UsualArithmeticConversions(lex, rex); 1291 return lex->getType(); 1292 } 1293 1294 // If both operands are the same structure or union type, the result is that 1295 // type. 1296 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 1297 if (const RecordType *RHSRT = rexT->getAsRecordType()) 1298 if (LHSRT->getDecl() == RHSRT->getDecl()) 1299 // "If both the operands have structure or union type, the result has 1300 // that type." This implies that CV qualifiers are dropped. 1301 return lexT.getUnqualifiedType(); 1302 } 1303 1304 // C99 6.5.15p5: "If both operands have void type, the result has void type." 1305 // The following || allows only one side to be void (a GCC-ism). 1306 if (lexT->isVoidType() || rexT->isVoidType()) { 1307 if (!lexT->isVoidType()) 1308 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 1309 rex->getSourceRange()); 1310 if (!rexT->isVoidType()) 1311 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 1312 lex->getSourceRange()); 1313 ImpCastExprToType(lex, Context.VoidTy); 1314 ImpCastExprToType(rex, Context.VoidTy); 1315 return Context.VoidTy; 1316 } 1317 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 1318 // the type of the other operand." 1319 if ((lexT->isPointerType() || lexT->isBlockPointerType() || 1320 Context.isObjCObjectPointerType(lexT)) && 1321 rex->isNullPointerConstant(Context)) { 1322 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 1323 return lexT; 1324 } 1325 if ((rexT->isPointerType() || rexT->isBlockPointerType() || 1326 Context.isObjCObjectPointerType(rexT)) && 1327 lex->isNullPointerConstant(Context)) { 1328 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 1329 return rexT; 1330 } 1331 // Handle the case where both operands are pointers before we handle null 1332 // pointer constants in case both operands are null pointer constants. 1333 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 1334 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 1335 // get the "pointed to" types 1336 QualType lhptee = LHSPT->getPointeeType(); 1337 QualType rhptee = RHSPT->getPointeeType(); 1338 1339 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 1340 if (lhptee->isVoidType() && 1341 rhptee->isIncompleteOrObjectType()) { 1342 // Figure out necessary qualifiers (C99 6.5.15p6) 1343 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 1344 QualType destType = Context.getPointerType(destPointee); 1345 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1346 ImpCastExprToType(rex, destType); // promote to void* 1347 return destType; 1348 } 1349 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 1350 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 1351 QualType destType = Context.getPointerType(destPointee); 1352 ImpCastExprToType(lex, destType); // add qualifiers if necessary 1353 ImpCastExprToType(rex, destType); // promote to void* 1354 return destType; 1355 } 1356 1357 QualType compositeType = lexT; 1358 1359 // If either type is an Objective-C object type then check 1360 // compatibility according to Objective-C. 1361 if (Context.isObjCObjectPointerType(lexT) || 1362 Context.isObjCObjectPointerType(rexT)) { 1363 // If both operands are interfaces and either operand can be 1364 // assigned to the other, use that type as the composite 1365 // type. This allows 1366 // xxx ? (A*) a : (B*) b 1367 // where B is a subclass of A. 1368 // 1369 // Additionally, as for assignment, if either type is 'id' 1370 // allow silent coercion. Finally, if the types are 1371 // incompatible then make sure to use 'id' as the composite 1372 // type so the result is acceptable for sending messages to. 1373 1374 // FIXME: This code should not be localized to here. Also this 1375 // should use a compatible check instead of abusing the 1376 // canAssignObjCInterfaces code. 1377 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1378 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1379 if (LHSIface && RHSIface && 1380 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1381 compositeType = lexT; 1382 } else if (LHSIface && RHSIface && 1383 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) { 1384 compositeType = rexT; 1385 } else if (Context.isObjCIdType(lhptee) || 1386 Context.isObjCIdType(rhptee)) { 1387 // FIXME: This code looks wrong, because isObjCIdType checks 1388 // the struct but getObjCIdType returns the pointer to 1389 // struct. This is horrible and should be fixed. 1390 compositeType = Context.getObjCIdType(); 1391 } else { 1392 QualType incompatTy = Context.getObjCIdType(); 1393 ImpCastExprToType(lex, incompatTy); 1394 ImpCastExprToType(rex, incompatTy); 1395 return incompatTy; 1396 } 1397 } else if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1398 rhptee.getUnqualifiedType())) { 1399 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 1400 lexT.getAsString(), rexT.getAsString(), 1401 lex->getSourceRange(), rex->getSourceRange()); 1402 // In this situation, we assume void* type. No especially good 1403 // reason, but this is what gcc does, and we do have to pick 1404 // to get a consistent AST. 1405 QualType incompatTy = Context.getPointerType(Context.VoidTy); 1406 ImpCastExprToType(lex, incompatTy); 1407 ImpCastExprToType(rex, incompatTy); 1408 return incompatTy; 1409 } 1410 // The pointer types are compatible. 1411 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 1412 // differently qualified versions of compatible types, the result type is 1413 // a pointer to an appropriately qualified version of the *composite* 1414 // type. 1415 // FIXME: Need to calculate the composite type. 1416 // FIXME: Need to add qualifiers 1417 ImpCastExprToType(lex, compositeType); 1418 ImpCastExprToType(rex, compositeType); 1419 return compositeType; 1420 } 1421 } 1422 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 1423 // evaluates to "struct objc_object *" (and is handled above when comparing 1424 // id with statically typed objects). 1425 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 1426 // GCC allows qualified id and any Objective-C type to devolve to 1427 // id. Currently localizing to here until clear this should be 1428 // part of ObjCQualifiedIdTypesAreCompatible. 1429 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true) || 1430 (lexT->isObjCQualifiedIdType() && 1431 Context.isObjCObjectPointerType(rexT)) || 1432 (rexT->isObjCQualifiedIdType() && 1433 Context.isObjCObjectPointerType(lexT))) { 1434 // FIXME: This is not the correct composite type. This only 1435 // happens to work because id can more or less be used anywhere, 1436 // however this may change the type of method sends. 1437 // FIXME: gcc adds some type-checking of the arguments and emits 1438 // (confusing) incompatible comparison warnings in some 1439 // cases. Investigate. 1440 QualType compositeType = Context.getObjCIdType(); 1441 ImpCastExprToType(lex, compositeType); 1442 ImpCastExprToType(rex, compositeType); 1443 return compositeType; 1444 } 1445 } 1446 1447 // Selection between block pointer types is ok as long as they are the same. 1448 if (lexT->isBlockPointerType() && rexT->isBlockPointerType() && 1449 Context.getCanonicalType(lexT) == Context.getCanonicalType(rexT)) 1450 return lexT; 1451 1452 // Otherwise, the operands are not compatible. 1453 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 1454 lexT.getAsString(), rexT.getAsString(), 1455 lex->getSourceRange(), rex->getSourceRange()); 1456 return QualType(); 1457} 1458 1459/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 1460/// in the case of a the GNU conditional expr extension. 1461Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 1462 SourceLocation ColonLoc, 1463 ExprTy *Cond, ExprTy *LHS, 1464 ExprTy *RHS) { 1465 Expr *CondExpr = (Expr *) Cond; 1466 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 1467 1468 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 1469 // was the condition. 1470 bool isLHSNull = LHSExpr == 0; 1471 if (isLHSNull) 1472 LHSExpr = CondExpr; 1473 1474 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1475 RHSExpr, QuestionLoc); 1476 if (result.isNull()) 1477 return true; 1478 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1479 RHSExpr, result); 1480} 1481 1482 1483// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1484// being closely modeled after the C99 spec:-). The odd characteristic of this 1485// routine is it effectively iqnores the qualifiers on the top level pointee. 1486// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1487// FIXME: add a couple examples in this comment. 1488Sema::AssignConvertType 1489Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1490 QualType lhptee, rhptee; 1491 1492 // get the "pointed to" type (ignoring qualifiers at the top level) 1493 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1494 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1495 1496 // make sure we operate on the canonical type 1497 lhptee = Context.getCanonicalType(lhptee); 1498 rhptee = Context.getCanonicalType(rhptee); 1499 1500 AssignConvertType ConvTy = Compatible; 1501 1502 // C99 6.5.16.1p1: This following citation is common to constraints 1503 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1504 // qualifiers of the type *pointed to* by the right; 1505 // FIXME: Handle ASQualType 1506 if ((lhptee.getCVRQualifiers() & rhptee.getCVRQualifiers()) != 1507 rhptee.getCVRQualifiers()) 1508 ConvTy = CompatiblePointerDiscardsQualifiers; 1509 1510 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1511 // incomplete type and the other is a pointer to a qualified or unqualified 1512 // version of void... 1513 if (lhptee->isVoidType()) { 1514 if (rhptee->isIncompleteOrObjectType()) 1515 return ConvTy; 1516 1517 // As an extension, we allow cast to/from void* to function pointer. 1518 assert(rhptee->isFunctionType()); 1519 return FunctionVoidPointer; 1520 } 1521 1522 if (rhptee->isVoidType()) { 1523 if (lhptee->isIncompleteOrObjectType()) 1524 return ConvTy; 1525 1526 // As an extension, we allow cast to/from void* to function pointer. 1527 assert(lhptee->isFunctionType()); 1528 return FunctionVoidPointer; 1529 } 1530 1531 // Check for ObjC interfaces 1532 const ObjCInterfaceType* LHSIface = lhptee->getAsObjCInterfaceType(); 1533 const ObjCInterfaceType* RHSIface = rhptee->getAsObjCInterfaceType(); 1534 if (LHSIface && RHSIface && 1535 Context.canAssignObjCInterfaces(LHSIface, RHSIface)) 1536 return ConvTy; 1537 1538 // ID acts sort of like void* for ObjC interfaces 1539 if (LHSIface && Context.isObjCIdType(rhptee)) 1540 return ConvTy; 1541 if (RHSIface && Context.isObjCIdType(lhptee)) 1542 return ConvTy; 1543 1544 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1545 // unqualified versions of compatible types, ... 1546 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1547 rhptee.getUnqualifiedType())) 1548 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1549 return ConvTy; 1550} 1551 1552/// CheckBlockPointerTypesForAssignment - This routine determines whether two 1553/// block pointer types are compatible or whether a block and normal pointer 1554/// are compatible. It is more restrict than comparing two function pointer 1555// types. 1556Sema::AssignConvertType 1557Sema::CheckBlockPointerTypesForAssignment(QualType lhsType, 1558 QualType rhsType) { 1559 QualType lhptee, rhptee; 1560 1561 // get the "pointed to" type (ignoring qualifiers at the top level) 1562 lhptee = lhsType->getAsBlockPointerType()->getPointeeType(); 1563 rhptee = rhsType->getAsBlockPointerType()->getPointeeType(); 1564 1565 // make sure we operate on the canonical type 1566 lhptee = Context.getCanonicalType(lhptee); 1567 rhptee = Context.getCanonicalType(rhptee); 1568 1569 AssignConvertType ConvTy = Compatible; 1570 1571 // For blocks we enforce that qualifiers are identical. 1572 if (lhptee.getCVRQualifiers() != rhptee.getCVRQualifiers()) 1573 ConvTy = CompatiblePointerDiscardsQualifiers; 1574 1575 if (!Context.typesAreBlockCompatible(lhptee, rhptee)) 1576 return IncompatibleBlockPointer; 1577 return ConvTy; 1578} 1579 1580/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1581/// has code to accommodate several GCC extensions when type checking 1582/// pointers. Here are some objectionable examples that GCC considers warnings: 1583/// 1584/// int a, *pint; 1585/// short *pshort; 1586/// struct foo *pfoo; 1587/// 1588/// pint = pshort; // warning: assignment from incompatible pointer type 1589/// a = pint; // warning: assignment makes integer from pointer without a cast 1590/// pint = a; // warning: assignment makes pointer from integer without a cast 1591/// pint = pfoo; // warning: assignment from incompatible pointer type 1592/// 1593/// As a result, the code for dealing with pointers is more complex than the 1594/// C99 spec dictates. 1595/// 1596Sema::AssignConvertType 1597Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1598 // Get canonical types. We're not formatting these types, just comparing 1599 // them. 1600 lhsType = Context.getCanonicalType(lhsType).getUnqualifiedType(); 1601 rhsType = Context.getCanonicalType(rhsType).getUnqualifiedType(); 1602 1603 if (lhsType == rhsType) 1604 return Compatible; // Common case: fast path an exact match. 1605 1606 if (lhsType->isReferenceType() || rhsType->isReferenceType()) { 1607 if (Context.typesAreCompatible(lhsType, rhsType)) 1608 return Compatible; 1609 return Incompatible; 1610 } 1611 1612 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1613 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1614 return Compatible; 1615 // Relax integer conversions like we do for pointers below. 1616 if (rhsType->isIntegerType()) 1617 return IntToPointer; 1618 if (lhsType->isIntegerType()) 1619 return PointerToInt; 1620 return IncompatibleObjCQualifiedId; 1621 } 1622 1623 if (lhsType->isVectorType() || rhsType->isVectorType()) { 1624 // For ExtVector, allow vector splats; float -> <n x float> 1625 if (const ExtVectorType *LV = lhsType->getAsExtVectorType()) 1626 if (LV->getElementType() == rhsType) 1627 return Compatible; 1628 1629 // If we are allowing lax vector conversions, and LHS and RHS are both 1630 // vectors, the total size only needs to be the same. This is a bitcast; 1631 // no bits are changed but the result type is different. 1632 if (getLangOptions().LaxVectorConversions && 1633 lhsType->isVectorType() && rhsType->isVectorType()) { 1634 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1635 return Compatible; 1636 } 1637 return Incompatible; 1638 } 1639 1640 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1641 return Compatible; 1642 1643 if (isa<PointerType>(lhsType)) { 1644 if (rhsType->isIntegerType()) 1645 return IntToPointer; 1646 1647 if (isa<PointerType>(rhsType)) 1648 return CheckPointerTypesForAssignment(lhsType, rhsType); 1649 1650 if (rhsType->getAsBlockPointerType()) { 1651 if (lhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1652 return BlockVoidPointer; 1653 1654 // Treat block pointers as objects. 1655 if (getLangOptions().ObjC1 && 1656 lhsType == Context.getCanonicalType(Context.getObjCIdType())) 1657 return Compatible; 1658 } 1659 return Incompatible; 1660 } 1661 1662 if (isa<BlockPointerType>(lhsType)) { 1663 if (rhsType->isIntegerType()) 1664 return IntToPointer; 1665 1666 // Treat block pointers as objects. 1667 if (getLangOptions().ObjC1 && 1668 rhsType == Context.getCanonicalType(Context.getObjCIdType())) 1669 return Compatible; 1670 1671 if (rhsType->isBlockPointerType()) 1672 return CheckBlockPointerTypesForAssignment(lhsType, rhsType); 1673 1674 if (const PointerType *RHSPT = rhsType->getAsPointerType()) { 1675 if (RHSPT->getPointeeType()->isVoidType()) 1676 return BlockVoidPointer; 1677 } 1678 return Incompatible; 1679 } 1680 1681 if (isa<PointerType>(rhsType)) { 1682 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1683 if (lhsType == Context.BoolTy) 1684 return Compatible; 1685 1686 if (lhsType->isIntegerType()) 1687 return PointerToInt; 1688 1689 if (isa<PointerType>(lhsType)) 1690 return CheckPointerTypesForAssignment(lhsType, rhsType); 1691 1692 if (isa<BlockPointerType>(lhsType) && 1693 rhsType->getAsPointerType()->getPointeeType()->isVoidType()) 1694 return BlockVoidPointer; 1695 return Incompatible; 1696 } 1697 1698 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1699 if (Context.typesAreCompatible(lhsType, rhsType)) 1700 return Compatible; 1701 } 1702 return Incompatible; 1703} 1704 1705Sema::AssignConvertType 1706Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1707 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1708 // a null pointer constant. 1709 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType() || 1710 lhsType->isBlockPointerType()) 1711 && rExpr->isNullPointerConstant(Context)) { 1712 ImpCastExprToType(rExpr, lhsType); 1713 return Compatible; 1714 } 1715 1716 // We don't allow conversion of non-null-pointer constants to integers. 1717 if (lhsType->isBlockPointerType() && rExpr->getType()->isIntegerType()) 1718 return IntToBlockPointer; 1719 1720 // This check seems unnatural, however it is necessary to ensure the proper 1721 // conversion of functions/arrays. If the conversion were done for all 1722 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1723 // expressions that surpress this implicit conversion (&, sizeof). 1724 // 1725 // Suppress this for references: C99 8.5.3p5. FIXME: revisit when references 1726 // are better understood. 1727 if (!lhsType->isReferenceType()) 1728 DefaultFunctionArrayConversion(rExpr); 1729 1730 Sema::AssignConvertType result = 1731 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1732 1733 // C99 6.5.16.1p2: The value of the right operand is converted to the 1734 // type of the assignment expression. 1735 if (rExpr->getType() != lhsType) 1736 ImpCastExprToType(rExpr, lhsType); 1737 return result; 1738} 1739 1740Sema::AssignConvertType 1741Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1742 return CheckAssignmentConstraints(lhsType, rhsType); 1743} 1744 1745QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1746 Diag(loc, diag::err_typecheck_invalid_operands, 1747 lex->getType().getAsString(), rex->getType().getAsString(), 1748 lex->getSourceRange(), rex->getSourceRange()); 1749 return QualType(); 1750} 1751 1752inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1753 Expr *&rex) { 1754 // For conversion purposes, we ignore any qualifiers. 1755 // For example, "const float" and "float" are equivalent. 1756 QualType lhsType = 1757 Context.getCanonicalType(lex->getType()).getUnqualifiedType(); 1758 QualType rhsType = 1759 Context.getCanonicalType(rex->getType()).getUnqualifiedType(); 1760 1761 // If the vector types are identical, return. 1762 if (lhsType == rhsType) 1763 return lhsType; 1764 1765 // Handle the case of a vector & extvector type of the same size and element 1766 // type. It would be nice if we only had one vector type someday. 1767 if (getLangOptions().LaxVectorConversions) 1768 if (const VectorType *LV = lhsType->getAsVectorType()) 1769 if (const VectorType *RV = rhsType->getAsVectorType()) 1770 if (LV->getElementType() == RV->getElementType() && 1771 LV->getNumElements() == RV->getNumElements()) 1772 return lhsType->isExtVectorType() ? lhsType : rhsType; 1773 1774 // If the lhs is an extended vector and the rhs is a scalar of the same type 1775 // or a literal, promote the rhs to the vector type. 1776 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1777 QualType eltType = V->getElementType(); 1778 1779 if ((eltType->getAsBuiltinType() == rhsType->getAsBuiltinType()) || 1780 (eltType->isIntegerType() && isa<IntegerLiteral>(rex)) || 1781 (eltType->isFloatingType() && isa<FloatingLiteral>(rex))) { 1782 ImpCastExprToType(rex, lhsType); 1783 return lhsType; 1784 } 1785 } 1786 1787 // If the rhs is an extended vector and the lhs is a scalar of the same type, 1788 // promote the lhs to the vector type. 1789 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1790 QualType eltType = V->getElementType(); 1791 1792 if ((eltType->getAsBuiltinType() == lhsType->getAsBuiltinType()) || 1793 (eltType->isIntegerType() && isa<IntegerLiteral>(lex)) || 1794 (eltType->isFloatingType() && isa<FloatingLiteral>(lex))) { 1795 ImpCastExprToType(lex, rhsType); 1796 return rhsType; 1797 } 1798 } 1799 1800 // You cannot convert between vector values of different size. 1801 Diag(loc, diag::err_typecheck_vector_not_convertable, 1802 lex->getType().getAsString(), rex->getType().getAsString(), 1803 lex->getSourceRange(), rex->getSourceRange()); 1804 return QualType(); 1805} 1806 1807inline QualType Sema::CheckMultiplyDivideOperands( 1808 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1809{ 1810 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1811 1812 if (lhsType->isVectorType() || rhsType->isVectorType()) 1813 return CheckVectorOperands(loc, lex, rex); 1814 1815 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1816 1817 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1818 return compType; 1819 return InvalidOperands(loc, lex, rex); 1820} 1821 1822inline QualType Sema::CheckRemainderOperands( 1823 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1824{ 1825 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1826 1827 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1828 1829 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1830 return compType; 1831 return InvalidOperands(loc, lex, rex); 1832} 1833 1834inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1835 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1836{ 1837 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1838 return CheckVectorOperands(loc, lex, rex); 1839 1840 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1841 1842 // handle the common case first (both operands are arithmetic). 1843 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1844 return compType; 1845 1846 // Put any potential pointer into PExp 1847 Expr* PExp = lex, *IExp = rex; 1848 if (IExp->getType()->isPointerType()) 1849 std::swap(PExp, IExp); 1850 1851 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1852 if (IExp->getType()->isIntegerType()) { 1853 // Check for arithmetic on pointers to incomplete types 1854 if (!PTy->getPointeeType()->isObjectType()) { 1855 if (PTy->getPointeeType()->isVoidType()) { 1856 Diag(loc, diag::ext_gnu_void_ptr, 1857 lex->getSourceRange(), rex->getSourceRange()); 1858 } else { 1859 Diag(loc, diag::err_typecheck_arithmetic_incomplete_type, 1860 lex->getType().getAsString(), lex->getSourceRange()); 1861 return QualType(); 1862 } 1863 } 1864 return PExp->getType(); 1865 } 1866 } 1867 1868 return InvalidOperands(loc, lex, rex); 1869} 1870 1871// C99 6.5.6 1872QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1873 SourceLocation loc, bool isCompAssign) { 1874 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1875 return CheckVectorOperands(loc, lex, rex); 1876 1877 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1878 1879 // Enforce type constraints: C99 6.5.6p3. 1880 1881 // Handle the common case first (both operands are arithmetic). 1882 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1883 return compType; 1884 1885 // Either ptr - int or ptr - ptr. 1886 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1887 QualType lpointee = LHSPTy->getPointeeType(); 1888 1889 // The LHS must be an object type, not incomplete, function, etc. 1890 if (!lpointee->isObjectType()) { 1891 // Handle the GNU void* extension. 1892 if (lpointee->isVoidType()) { 1893 Diag(loc, diag::ext_gnu_void_ptr, 1894 lex->getSourceRange(), rex->getSourceRange()); 1895 } else { 1896 Diag(loc, diag::err_typecheck_sub_ptr_object, 1897 lex->getType().getAsString(), lex->getSourceRange()); 1898 return QualType(); 1899 } 1900 } 1901 1902 // The result type of a pointer-int computation is the pointer type. 1903 if (rex->getType()->isIntegerType()) 1904 return lex->getType(); 1905 1906 // Handle pointer-pointer subtractions. 1907 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 1908 QualType rpointee = RHSPTy->getPointeeType(); 1909 1910 // RHS must be an object type, unless void (GNU). 1911 if (!rpointee->isObjectType()) { 1912 // Handle the GNU void* extension. 1913 if (rpointee->isVoidType()) { 1914 if (!lpointee->isVoidType()) 1915 Diag(loc, diag::ext_gnu_void_ptr, 1916 lex->getSourceRange(), rex->getSourceRange()); 1917 } else { 1918 Diag(loc, diag::err_typecheck_sub_ptr_object, 1919 rex->getType().getAsString(), rex->getSourceRange()); 1920 return QualType(); 1921 } 1922 } 1923 1924 // Pointee types must be compatible. 1925 if (!Context.typesAreCompatible( 1926 Context.getCanonicalType(lpointee).getUnqualifiedType(), 1927 Context.getCanonicalType(rpointee).getUnqualifiedType())) { 1928 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 1929 lex->getType().getAsString(), rex->getType().getAsString(), 1930 lex->getSourceRange(), rex->getSourceRange()); 1931 return QualType(); 1932 } 1933 1934 return Context.getPointerDiffType(); 1935 } 1936 } 1937 1938 return InvalidOperands(loc, lex, rex); 1939} 1940 1941// C99 6.5.7 1942QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1943 bool isCompAssign) { 1944 // C99 6.5.7p2: Each of the operands shall have integer type. 1945 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 1946 return InvalidOperands(loc, lex, rex); 1947 1948 // Shifts don't perform usual arithmetic conversions, they just do integer 1949 // promotions on each operand. C99 6.5.7p3 1950 if (!isCompAssign) 1951 UsualUnaryConversions(lex); 1952 UsualUnaryConversions(rex); 1953 1954 // "The type of the result is that of the promoted left operand." 1955 return lex->getType(); 1956} 1957 1958static bool areComparableObjCInterfaces(QualType LHS, QualType RHS, 1959 ASTContext& Context) { 1960 const ObjCInterfaceType* LHSIface = LHS->getAsObjCInterfaceType(); 1961 const ObjCInterfaceType* RHSIface = RHS->getAsObjCInterfaceType(); 1962 // ID acts sort of like void* for ObjC interfaces 1963 if (LHSIface && Context.isObjCIdType(RHS)) 1964 return true; 1965 if (RHSIface && Context.isObjCIdType(LHS)) 1966 return true; 1967 if (!LHSIface || !RHSIface) 1968 return false; 1969 return Context.canAssignObjCInterfaces(LHSIface, RHSIface) || 1970 Context.canAssignObjCInterfaces(RHSIface, LHSIface); 1971} 1972 1973// C99 6.5.8 1974QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1975 bool isRelational) { 1976 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1977 return CheckVectorCompareOperands(lex, rex, loc, isRelational); 1978 1979 // C99 6.5.8p3 / C99 6.5.9p4 1980 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1981 UsualArithmeticConversions(lex, rex); 1982 else { 1983 UsualUnaryConversions(lex); 1984 UsualUnaryConversions(rex); 1985 } 1986 QualType lType = lex->getType(); 1987 QualType rType = rex->getType(); 1988 1989 // For non-floating point types, check for self-comparisons of the form 1990 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 1991 // often indicate logic errors in the program. 1992 if (!lType->isFloatingType()) { 1993 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 1994 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 1995 if (DRL->getDecl() == DRR->getDecl()) 1996 Diag(loc, diag::warn_selfcomparison); 1997 } 1998 1999 if (isRelational) { 2000 if (lType->isRealType() && rType->isRealType()) 2001 return Context.IntTy; 2002 } else { 2003 // Check for comparisons of floating point operands using != and ==. 2004 if (lType->isFloatingType()) { 2005 assert (rType->isFloatingType()); 2006 CheckFloatComparison(loc,lex,rex); 2007 } 2008 2009 if (lType->isArithmeticType() && rType->isArithmeticType()) 2010 return Context.IntTy; 2011 } 2012 2013 bool LHSIsNull = lex->isNullPointerConstant(Context); 2014 bool RHSIsNull = rex->isNullPointerConstant(Context); 2015 2016 // All of the following pointer related warnings are GCC extensions, except 2017 // when handling null pointer constants. One day, we can consider making them 2018 // errors (when -pedantic-errors is enabled). 2019 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 2020 QualType LCanPointeeTy = 2021 Context.getCanonicalType(lType->getAsPointerType()->getPointeeType()); 2022 QualType RCanPointeeTy = 2023 Context.getCanonicalType(rType->getAsPointerType()->getPointeeType()); 2024 2025 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 2026 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 2027 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 2028 RCanPointeeTy.getUnqualifiedType()) && 2029 !areComparableObjCInterfaces(LCanPointeeTy, RCanPointeeTy, Context)) { 2030 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 2031 lType.getAsString(), rType.getAsString(), 2032 lex->getSourceRange(), rex->getSourceRange()); 2033 } 2034 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2035 return Context.IntTy; 2036 } 2037 // Handle block pointer types. 2038 if (lType->isBlockPointerType() && rType->isBlockPointerType()) { 2039 QualType lpointee = lType->getAsBlockPointerType()->getPointeeType(); 2040 QualType rpointee = rType->getAsBlockPointerType()->getPointeeType(); 2041 2042 if (!LHSIsNull && !RHSIsNull && 2043 !Context.typesAreBlockCompatible(lpointee, rpointee)) { 2044 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2045 lType.getAsString(), rType.getAsString(), 2046 lex->getSourceRange(), rex->getSourceRange()); 2047 } 2048 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2049 return Context.IntTy; 2050 } 2051 // Allow block pointers to be compared with null pointer constants. 2052 if ((lType->isBlockPointerType() && rType->isPointerType()) || 2053 (lType->isPointerType() && rType->isBlockPointerType())) { 2054 if (!LHSIsNull && !RHSIsNull) { 2055 Diag(loc, diag::err_typecheck_comparison_of_distinct_blocks, 2056 lType.getAsString(), rType.getAsString(), 2057 lex->getSourceRange(), rex->getSourceRange()); 2058 } 2059 ImpCastExprToType(rex, lType); // promote the pointer to pointer 2060 return Context.IntTy; 2061 } 2062 2063 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType())) { 2064 if (ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 2065 ImpCastExprToType(rex, lType); 2066 return Context.IntTy; 2067 } else { 2068 if ((lType->isObjCQualifiedIdType() && rType->isObjCQualifiedIdType())) { 2069 Diag(loc, diag::warn_incompatible_qualified_id_operands, 2070 lex->getType().getAsString(), rex->getType().getAsString(), 2071 lex->getSourceRange(), rex->getSourceRange()); 2072 return QualType(); 2073 } 2074 } 2075 } 2076 if ((lType->isPointerType() || lType->isObjCQualifiedIdType()) && 2077 rType->isIntegerType()) { 2078 if (!RHSIsNull) 2079 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2080 lType.getAsString(), rType.getAsString(), 2081 lex->getSourceRange(), rex->getSourceRange()); 2082 ImpCastExprToType(rex, lType); // promote the integer to pointer 2083 return Context.IntTy; 2084 } 2085 if (lType->isIntegerType() && 2086 (rType->isPointerType() || rType->isObjCQualifiedIdType())) { 2087 if (!LHSIsNull) 2088 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2089 lType.getAsString(), rType.getAsString(), 2090 lex->getSourceRange(), rex->getSourceRange()); 2091 ImpCastExprToType(lex, rType); // promote the integer to pointer 2092 return Context.IntTy; 2093 } 2094 // Handle block pointers. 2095 if (lType->isBlockPointerType() && rType->isIntegerType()) { 2096 if (!RHSIsNull) 2097 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2098 lType.getAsString(), rType.getAsString(), 2099 lex->getSourceRange(), rex->getSourceRange()); 2100 ImpCastExprToType(rex, lType); // promote the integer to pointer 2101 return Context.IntTy; 2102 } 2103 if (lType->isIntegerType() && rType->isBlockPointerType()) { 2104 if (!LHSIsNull) 2105 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 2106 lType.getAsString(), rType.getAsString(), 2107 lex->getSourceRange(), rex->getSourceRange()); 2108 ImpCastExprToType(lex, rType); // promote the integer to pointer 2109 return Context.IntTy; 2110 } 2111 return InvalidOperands(loc, lex, rex); 2112} 2113 2114/// CheckVectorCompareOperands - vector comparisons are a clang extension that 2115/// operates on extended vector types. Instead of producing an IntTy result, 2116/// like a scalar comparison, a vector comparison produces a vector of integer 2117/// types. 2118QualType Sema::CheckVectorCompareOperands(Expr *&lex, Expr *&rex, 2119 SourceLocation loc, 2120 bool isRelational) { 2121 // Check to make sure we're operating on vectors of the same type and width, 2122 // Allowing one side to be a scalar of element type. 2123 QualType vType = CheckVectorOperands(loc, lex, rex); 2124 if (vType.isNull()) 2125 return vType; 2126 2127 QualType lType = lex->getType(); 2128 QualType rType = rex->getType(); 2129 2130 // For non-floating point types, check for self-comparisons of the form 2131 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 2132 // often indicate logic errors in the program. 2133 if (!lType->isFloatingType()) { 2134 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 2135 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 2136 if (DRL->getDecl() == DRR->getDecl()) 2137 Diag(loc, diag::warn_selfcomparison); 2138 } 2139 2140 // Check for comparisons of floating point operands using != and ==. 2141 if (!isRelational && lType->isFloatingType()) { 2142 assert (rType->isFloatingType()); 2143 CheckFloatComparison(loc,lex,rex); 2144 } 2145 2146 // Return the type for the comparison, which is the same as vector type for 2147 // integer vectors, or an integer type of identical size and number of 2148 // elements for floating point vectors. 2149 if (lType->isIntegerType()) 2150 return lType; 2151 2152 const VectorType *VTy = lType->getAsVectorType(); 2153 2154 // FIXME: need to deal with non-32b int / non-64b long long 2155 unsigned TypeSize = Context.getTypeSize(VTy->getElementType()); 2156 if (TypeSize == 32) { 2157 return Context.getExtVectorType(Context.IntTy, VTy->getNumElements()); 2158 } 2159 assert(TypeSize == 64 && "Unhandled vector element size in vector compare"); 2160 return Context.getExtVectorType(Context.LongLongTy, VTy->getNumElements()); 2161} 2162 2163inline QualType Sema::CheckBitwiseOperands( 2164 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 2165{ 2166 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 2167 return CheckVectorOperands(loc, lex, rex); 2168 2169 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 2170 2171 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 2172 return compType; 2173 return InvalidOperands(loc, lex, rex); 2174} 2175 2176inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 2177 Expr *&lex, Expr *&rex, SourceLocation loc) 2178{ 2179 UsualUnaryConversions(lex); 2180 UsualUnaryConversions(rex); 2181 2182 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 2183 return Context.IntTy; 2184 return InvalidOperands(loc, lex, rex); 2185} 2186 2187inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 2188 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 2189{ 2190 QualType lhsType = lex->getType(); 2191 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 2192 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(Context); 2193 2194 switch (mlval) { // C99 6.5.16p2 2195 case Expr::MLV_Valid: 2196 break; 2197 case Expr::MLV_ConstQualified: 2198 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 2199 return QualType(); 2200 case Expr::MLV_ArrayType: 2201 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 2202 lhsType.getAsString(), lex->getSourceRange()); 2203 return QualType(); 2204 case Expr::MLV_NotObjectType: 2205 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 2206 lhsType.getAsString(), lex->getSourceRange()); 2207 return QualType(); 2208 case Expr::MLV_InvalidExpression: 2209 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 2210 lex->getSourceRange()); 2211 return QualType(); 2212 case Expr::MLV_IncompleteType: 2213 case Expr::MLV_IncompleteVoidType: 2214 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 2215 lhsType.getAsString(), lex->getSourceRange()); 2216 return QualType(); 2217 case Expr::MLV_DuplicateVectorComponents: 2218 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 2219 lex->getSourceRange()); 2220 return QualType(); 2221 case Expr::MLV_NotBlockQualified: 2222 Diag(loc, diag::err_block_decl_ref_not_modifiable_lvalue, 2223 lex->getSourceRange()); 2224 return QualType(); 2225 } 2226 2227 AssignConvertType ConvTy; 2228 if (compoundType.isNull()) { 2229 // Simple assignment "x = y". 2230 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 2231 2232 // If the RHS is a unary plus or minus, check to see if they = and + are 2233 // right next to each other. If so, the user may have typo'd "x =+ 4" 2234 // instead of "x += 4". 2235 Expr *RHSCheck = rex; 2236 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(RHSCheck)) 2237 RHSCheck = ICE->getSubExpr(); 2238 if (UnaryOperator *UO = dyn_cast<UnaryOperator>(RHSCheck)) { 2239 if ((UO->getOpcode() == UnaryOperator::Plus || 2240 UO->getOpcode() == UnaryOperator::Minus) && 2241 loc.isFileID() && UO->getOperatorLoc().isFileID() && 2242 // Only if the two operators are exactly adjacent. 2243 loc.getFileLocWithOffset(1) == UO->getOperatorLoc()) 2244 Diag(loc, diag::warn_not_compound_assign, 2245 UO->getOpcode() == UnaryOperator::Plus ? "+" : "-", 2246 SourceRange(UO->getOperatorLoc(), UO->getOperatorLoc())); 2247 } 2248 } else { 2249 // Compound assignment "x += y" 2250 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 2251 } 2252 2253 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 2254 rex, "assigning")) 2255 return QualType(); 2256 2257 // C99 6.5.16p3: The type of an assignment expression is the type of the 2258 // left operand unless the left operand has qualified type, in which case 2259 // it is the unqualified version of the type of the left operand. 2260 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 2261 // is converted to the type of the assignment expression (above). 2262 // C++ 5.17p1: the type of the assignment expression is that of its left 2263 // oprdu. 2264 return lhsType.getUnqualifiedType(); 2265} 2266 2267inline QualType Sema::CheckCommaOperands( // C99 6.5.17 2268 Expr *&lex, Expr *&rex, SourceLocation loc) { 2269 2270 // Comma performs lvalue conversion (C99 6.3.2.1), but not unary conversions. 2271 DefaultFunctionArrayConversion(rex); 2272 return rex->getType(); 2273} 2274 2275/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 2276/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 2277QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 2278 QualType resType = op->getType(); 2279 assert(!resType.isNull() && "no type for increment/decrement expression"); 2280 2281 // C99 6.5.2.4p1: We allow complex as a GCC extension. 2282 if (const PointerType *pt = resType->getAsPointerType()) { 2283 if (pt->getPointeeType()->isVoidType()) { 2284 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 2285 } else if (!pt->getPointeeType()->isObjectType()) { 2286 // C99 6.5.2.4p2, 6.5.6p2 2287 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 2288 resType.getAsString(), op->getSourceRange()); 2289 return QualType(); 2290 } 2291 } else if (!resType->isRealType()) { 2292 if (resType->isComplexType()) 2293 // C99 does not support ++/-- on complex types. 2294 Diag(OpLoc, diag::ext_integer_increment_complex, 2295 resType.getAsString(), op->getSourceRange()); 2296 else { 2297 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 2298 resType.getAsString(), op->getSourceRange()); 2299 return QualType(); 2300 } 2301 } 2302 // At this point, we know we have a real, complex or pointer type. 2303 // Now make sure the operand is a modifiable lvalue. 2304 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(Context); 2305 if (mlval != Expr::MLV_Valid) { 2306 // FIXME: emit a more precise diagnostic... 2307 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 2308 op->getSourceRange()); 2309 return QualType(); 2310 } 2311 return resType; 2312} 2313 2314/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 2315/// This routine allows us to typecheck complex/recursive expressions 2316/// where the declaration is needed for type checking. We only need to 2317/// handle cases when the expression references a function designator 2318/// or is an lvalue. Here are some examples: 2319/// - &(x) => x 2320/// - &*****f => f for f a function designator. 2321/// - &s.xx => s 2322/// - &s.zz[1].yy -> s, if zz is an array 2323/// - *(x + 1) -> x, if x is an array 2324/// - &"123"[2] -> 0 2325/// - & __real__ x -> x 2326static ValueDecl *getPrimaryDecl(Expr *E) { 2327 switch (E->getStmtClass()) { 2328 case Stmt::DeclRefExprClass: 2329 return cast<DeclRefExpr>(E)->getDecl(); 2330 case Stmt::MemberExprClass: 2331 // Fields cannot be declared with a 'register' storage class. 2332 // &X->f is always ok, even if X is declared register. 2333 if (cast<MemberExpr>(E)->isArrow()) 2334 return 0; 2335 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 2336 case Stmt::ArraySubscriptExprClass: { 2337 // &X[4] and &4[X] refers to X if X is not a pointer. 2338 2339 ValueDecl *VD = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 2340 if (!VD || VD->getType()->isPointerType()) 2341 return 0; 2342 else 2343 return VD; 2344 } 2345 case Stmt::UnaryOperatorClass: { 2346 UnaryOperator *UO = cast<UnaryOperator>(E); 2347 2348 switch(UO->getOpcode()) { 2349 case UnaryOperator::Deref: { 2350 // *(X + 1) refers to X if X is not a pointer. 2351 ValueDecl *VD = getPrimaryDecl(UO->getSubExpr()); 2352 if (!VD || VD->getType()->isPointerType()) 2353 return 0; 2354 return VD; 2355 } 2356 case UnaryOperator::Real: 2357 case UnaryOperator::Imag: 2358 case UnaryOperator::Extension: 2359 return getPrimaryDecl(UO->getSubExpr()); 2360 default: 2361 return 0; 2362 } 2363 } 2364 case Stmt::BinaryOperatorClass: { 2365 BinaryOperator *BO = cast<BinaryOperator>(E); 2366 2367 // Handle cases involving pointer arithmetic. The result of an 2368 // Assign or AddAssign is not an lvalue so they can be ignored. 2369 2370 // (x + n) or (n + x) => x 2371 if (BO->getOpcode() == BinaryOperator::Add) { 2372 if (BO->getLHS()->getType()->isPointerType()) { 2373 return getPrimaryDecl(BO->getLHS()); 2374 } else if (BO->getRHS()->getType()->isPointerType()) { 2375 return getPrimaryDecl(BO->getRHS()); 2376 } 2377 } 2378 2379 return 0; 2380 } 2381 case Stmt::ParenExprClass: 2382 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 2383 case Stmt::ImplicitCastExprClass: 2384 // &X[4] when X is an array, has an implicit cast from array to pointer. 2385 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 2386 default: 2387 return 0; 2388 } 2389} 2390 2391/// CheckAddressOfOperand - The operand of & must be either a function 2392/// designator or an lvalue designating an object. If it is an lvalue, the 2393/// object cannot be declared with storage class register or be a bit field. 2394/// Note: The usual conversions are *not* applied to the operand of the & 2395/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 2396QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 2397 if (getLangOptions().C99) { 2398 // Implement C99-only parts of addressof rules. 2399 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 2400 if (uOp->getOpcode() == UnaryOperator::Deref) 2401 // Per C99 6.5.3.2, the address of a deref always returns a valid result 2402 // (assuming the deref expression is valid). 2403 return uOp->getSubExpr()->getType(); 2404 } 2405 // Technically, there should be a check for array subscript 2406 // expressions here, but the result of one is always an lvalue anyway. 2407 } 2408 ValueDecl *dcl = getPrimaryDecl(op); 2409 Expr::isLvalueResult lval = op->isLvalue(Context); 2410 2411 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 2412 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 2413 // FIXME: emit more specific diag... 2414 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 2415 op->getSourceRange()); 2416 return QualType(); 2417 } 2418 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 2419 if (MemExpr->getMemberDecl()->isBitField()) { 2420 Diag(OpLoc, diag::err_typecheck_address_of, 2421 std::string("bit-field"), op->getSourceRange()); 2422 return QualType(); 2423 } 2424 // Check for Apple extension for accessing vector components. 2425 } else if (isa<ArraySubscriptExpr>(op) && 2426 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 2427 Diag(OpLoc, diag::err_typecheck_address_of, 2428 std::string("vector"), op->getSourceRange()); 2429 return QualType(); 2430 } else if (dcl) { // C99 6.5.3.2p1 2431 // We have an lvalue with a decl. Make sure the decl is not declared 2432 // with the register storage-class specifier. 2433 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 2434 if (vd->getStorageClass() == VarDecl::Register) { 2435 Diag(OpLoc, diag::err_typecheck_address_of, 2436 std::string("register variable"), op->getSourceRange()); 2437 return QualType(); 2438 } 2439 } else 2440 assert(0 && "Unknown/unexpected decl type"); 2441 } 2442 2443 // If the operand has type "type", the result has type "pointer to type". 2444 return Context.getPointerType(op->getType()); 2445} 2446 2447QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 2448 UsualUnaryConversions(op); 2449 QualType qType = op->getType(); 2450 2451 if (const PointerType *PT = qType->getAsPointerType()) { 2452 // Note that per both C89 and C99, this is always legal, even 2453 // if ptype is an incomplete type or void. 2454 // It would be possible to warn about dereferencing a 2455 // void pointer, but it's completely well-defined, 2456 // and such a warning is unlikely to catch any mistakes. 2457 return PT->getPointeeType(); 2458 } 2459 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 2460 qType.getAsString(), op->getSourceRange()); 2461 return QualType(); 2462} 2463 2464static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 2465 tok::TokenKind Kind) { 2466 BinaryOperator::Opcode Opc; 2467 switch (Kind) { 2468 default: assert(0 && "Unknown binop!"); 2469 case tok::star: Opc = BinaryOperator::Mul; break; 2470 case tok::slash: Opc = BinaryOperator::Div; break; 2471 case tok::percent: Opc = BinaryOperator::Rem; break; 2472 case tok::plus: Opc = BinaryOperator::Add; break; 2473 case tok::minus: Opc = BinaryOperator::Sub; break; 2474 case tok::lessless: Opc = BinaryOperator::Shl; break; 2475 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 2476 case tok::lessequal: Opc = BinaryOperator::LE; break; 2477 case tok::less: Opc = BinaryOperator::LT; break; 2478 case tok::greaterequal: Opc = BinaryOperator::GE; break; 2479 case tok::greater: Opc = BinaryOperator::GT; break; 2480 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 2481 case tok::equalequal: Opc = BinaryOperator::EQ; break; 2482 case tok::amp: Opc = BinaryOperator::And; break; 2483 case tok::caret: Opc = BinaryOperator::Xor; break; 2484 case tok::pipe: Opc = BinaryOperator::Or; break; 2485 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 2486 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 2487 case tok::equal: Opc = BinaryOperator::Assign; break; 2488 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 2489 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 2490 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 2491 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 2492 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 2493 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 2494 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 2495 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 2496 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 2497 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 2498 case tok::comma: Opc = BinaryOperator::Comma; break; 2499 } 2500 return Opc; 2501} 2502 2503static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 2504 tok::TokenKind Kind) { 2505 UnaryOperator::Opcode Opc; 2506 switch (Kind) { 2507 default: assert(0 && "Unknown unary op!"); 2508 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 2509 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 2510 case tok::amp: Opc = UnaryOperator::AddrOf; break; 2511 case tok::star: Opc = UnaryOperator::Deref; break; 2512 case tok::plus: Opc = UnaryOperator::Plus; break; 2513 case tok::minus: Opc = UnaryOperator::Minus; break; 2514 case tok::tilde: Opc = UnaryOperator::Not; break; 2515 case tok::exclaim: Opc = UnaryOperator::LNot; break; 2516 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 2517 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 2518 case tok::kw___real: Opc = UnaryOperator::Real; break; 2519 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 2520 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 2521 } 2522 return Opc; 2523} 2524 2525// Binary Operators. 'Tok' is the token for the operator. 2526Action::ExprResult Sema::ActOnBinOp(SourceLocation TokLoc, tok::TokenKind Kind, 2527 ExprTy *LHS, ExprTy *RHS) { 2528 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 2529 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 2530 2531 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 2532 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 2533 2534 QualType ResultTy; // Result type of the binary operator. 2535 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 2536 2537 switch (Opc) { 2538 default: 2539 assert(0 && "Unknown binary expr!"); 2540 case BinaryOperator::Assign: 2541 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, QualType()); 2542 break; 2543 case BinaryOperator::Mul: 2544 case BinaryOperator::Div: 2545 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc); 2546 break; 2547 case BinaryOperator::Rem: 2548 ResultTy = CheckRemainderOperands(lhs, rhs, TokLoc); 2549 break; 2550 case BinaryOperator::Add: 2551 ResultTy = CheckAdditionOperands(lhs, rhs, TokLoc); 2552 break; 2553 case BinaryOperator::Sub: 2554 ResultTy = CheckSubtractionOperands(lhs, rhs, TokLoc); 2555 break; 2556 case BinaryOperator::Shl: 2557 case BinaryOperator::Shr: 2558 ResultTy = CheckShiftOperands(lhs, rhs, TokLoc); 2559 break; 2560 case BinaryOperator::LE: 2561 case BinaryOperator::LT: 2562 case BinaryOperator::GE: 2563 case BinaryOperator::GT: 2564 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, true); 2565 break; 2566 case BinaryOperator::EQ: 2567 case BinaryOperator::NE: 2568 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, false); 2569 break; 2570 case BinaryOperator::And: 2571 case BinaryOperator::Xor: 2572 case BinaryOperator::Or: 2573 ResultTy = CheckBitwiseOperands(lhs, rhs, TokLoc); 2574 break; 2575 case BinaryOperator::LAnd: 2576 case BinaryOperator::LOr: 2577 ResultTy = CheckLogicalOperands(lhs, rhs, TokLoc); 2578 break; 2579 case BinaryOperator::MulAssign: 2580 case BinaryOperator::DivAssign: 2581 CompTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc, true); 2582 if (!CompTy.isNull()) 2583 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2584 break; 2585 case BinaryOperator::RemAssign: 2586 CompTy = CheckRemainderOperands(lhs, rhs, TokLoc, true); 2587 if (!CompTy.isNull()) 2588 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2589 break; 2590 case BinaryOperator::AddAssign: 2591 CompTy = CheckAdditionOperands(lhs, rhs, TokLoc, true); 2592 if (!CompTy.isNull()) 2593 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2594 break; 2595 case BinaryOperator::SubAssign: 2596 CompTy = CheckSubtractionOperands(lhs, rhs, TokLoc, true); 2597 if (!CompTy.isNull()) 2598 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2599 break; 2600 case BinaryOperator::ShlAssign: 2601 case BinaryOperator::ShrAssign: 2602 CompTy = CheckShiftOperands(lhs, rhs, TokLoc, true); 2603 if (!CompTy.isNull()) 2604 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2605 break; 2606 case BinaryOperator::AndAssign: 2607 case BinaryOperator::XorAssign: 2608 case BinaryOperator::OrAssign: 2609 CompTy = CheckBitwiseOperands(lhs, rhs, TokLoc, true); 2610 if (!CompTy.isNull()) 2611 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2612 break; 2613 case BinaryOperator::Comma: 2614 ResultTy = CheckCommaOperands(lhs, rhs, TokLoc); 2615 break; 2616 } 2617 if (ResultTy.isNull()) 2618 return true; 2619 if (CompTy.isNull()) 2620 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 2621 else 2622 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, TokLoc); 2623} 2624 2625// Unary Operators. 'Tok' is the token for the operator. 2626Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2627 ExprTy *input) { 2628 Expr *Input = (Expr*)input; 2629 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2630 QualType resultType; 2631 switch (Opc) { 2632 default: 2633 assert(0 && "Unimplemented unary expr!"); 2634 case UnaryOperator::PreInc: 2635 case UnaryOperator::PreDec: 2636 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2637 break; 2638 case UnaryOperator::AddrOf: 2639 resultType = CheckAddressOfOperand(Input, OpLoc); 2640 break; 2641 case UnaryOperator::Deref: 2642 DefaultFunctionArrayConversion(Input); 2643 resultType = CheckIndirectionOperand(Input, OpLoc); 2644 break; 2645 case UnaryOperator::Plus: 2646 case UnaryOperator::Minus: 2647 UsualUnaryConversions(Input); 2648 resultType = Input->getType(); 2649 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2650 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2651 resultType.getAsString()); 2652 break; 2653 case UnaryOperator::Not: // bitwise complement 2654 UsualUnaryConversions(Input); 2655 resultType = Input->getType(); 2656 // C99 6.5.3.3p1. We allow complex int and float as a GCC extension. 2657 if (resultType->isComplexType() || resultType->isComplexIntegerType()) 2658 // C99 does not support '~' for complex conjugation. 2659 Diag(OpLoc, diag::ext_integer_complement_complex, 2660 resultType.getAsString(), Input->getSourceRange()); 2661 else if (!resultType->isIntegerType()) 2662 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2663 resultType.getAsString(), Input->getSourceRange()); 2664 break; 2665 case UnaryOperator::LNot: // logical negation 2666 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2667 DefaultFunctionArrayConversion(Input); 2668 resultType = Input->getType(); 2669 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2670 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2671 resultType.getAsString()); 2672 // LNot always has type int. C99 6.5.3.3p5. 2673 resultType = Context.IntTy; 2674 break; 2675 case UnaryOperator::SizeOf: 2676 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2677 Input->getSourceRange(), true); 2678 break; 2679 case UnaryOperator::AlignOf: 2680 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, 2681 Input->getSourceRange(), false); 2682 break; 2683 case UnaryOperator::Real: 2684 case UnaryOperator::Imag: 2685 resultType = CheckRealImagOperand(Input, OpLoc); 2686 break; 2687 case UnaryOperator::Extension: 2688 resultType = Input->getType(); 2689 break; 2690 } 2691 if (resultType.isNull()) 2692 return true; 2693 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2694} 2695 2696/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2697Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2698 SourceLocation LabLoc, 2699 IdentifierInfo *LabelII) { 2700 // Look up the record for this label identifier. 2701 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2702 2703 // If we haven't seen this label yet, create a forward reference. It 2704 // will be validated and/or cleaned up in ActOnFinishFunctionBody. 2705 if (LabelDecl == 0) 2706 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2707 2708 // Create the AST node. The address of a label always has type 'void*'. 2709 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2710 Context.getPointerType(Context.VoidTy)); 2711} 2712 2713Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2714 SourceLocation RPLoc) { // "({..})" 2715 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2716 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2717 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2718 2719 // FIXME: there are a variety of strange constraints to enforce here, for 2720 // example, it is not possible to goto into a stmt expression apparently. 2721 // More semantic analysis is needed. 2722 2723 // FIXME: the last statement in the compount stmt has its value used. We 2724 // should not warn about it being unused. 2725 2726 // If there are sub stmts in the compound stmt, take the type of the last one 2727 // as the type of the stmtexpr. 2728 QualType Ty = Context.VoidTy; 2729 2730 if (!Compound->body_empty()) { 2731 Stmt *LastStmt = Compound->body_back(); 2732 // If LastStmt is a label, skip down through into the body. 2733 while (LabelStmt *Label = dyn_cast<LabelStmt>(LastStmt)) 2734 LastStmt = Label->getSubStmt(); 2735 2736 if (Expr *LastExpr = dyn_cast<Expr>(LastStmt)) 2737 Ty = LastExpr->getType(); 2738 } 2739 2740 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2741} 2742 2743Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2744 SourceLocation TypeLoc, 2745 TypeTy *argty, 2746 OffsetOfComponent *CompPtr, 2747 unsigned NumComponents, 2748 SourceLocation RPLoc) { 2749 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2750 assert(!ArgTy.isNull() && "Missing type argument!"); 2751 2752 // We must have at least one component that refers to the type, and the first 2753 // one is known to be a field designator. Verify that the ArgTy represents 2754 // a struct/union/class. 2755 if (!ArgTy->isRecordType()) 2756 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2757 2758 // Otherwise, create a compound literal expression as the base, and 2759 // iteratively process the offsetof designators. 2760 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2761 2762 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2763 // GCC extension, diagnose them. 2764 if (NumComponents != 1) 2765 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2766 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2767 2768 for (unsigned i = 0; i != NumComponents; ++i) { 2769 const OffsetOfComponent &OC = CompPtr[i]; 2770 if (OC.isBrackets) { 2771 // Offset of an array sub-field. TODO: Should we allow vector elements? 2772 const ArrayType *AT = Context.getAsArrayType(Res->getType()); 2773 if (!AT) { 2774 delete Res; 2775 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 2776 Res->getType().getAsString()); 2777 } 2778 2779 // FIXME: C++: Verify that operator[] isn't overloaded. 2780 2781 // C99 6.5.2.1p1 2782 Expr *Idx = static_cast<Expr*>(OC.U.E); 2783 if (!Idx->getType()->isIntegerType()) 2784 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 2785 Idx->getSourceRange()); 2786 2787 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 2788 continue; 2789 } 2790 2791 const RecordType *RC = Res->getType()->getAsRecordType(); 2792 if (!RC) { 2793 delete Res; 2794 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 2795 Res->getType().getAsString()); 2796 } 2797 2798 // Get the decl corresponding to this. 2799 RecordDecl *RD = RC->getDecl(); 2800 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 2801 if (!MemberDecl) 2802 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 2803 OC.U.IdentInfo->getName(), 2804 SourceRange(OC.LocStart, OC.LocEnd)); 2805 2806 // FIXME: C++: Verify that MemberDecl isn't a static field. 2807 // FIXME: Verify that MemberDecl isn't a bitfield. 2808 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 2809 // matter here. 2810 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, MemberDecl->getType()); 2811 } 2812 2813 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 2814 BuiltinLoc); 2815} 2816 2817 2818Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 2819 TypeTy *arg1, TypeTy *arg2, 2820 SourceLocation RPLoc) { 2821 QualType argT1 = QualType::getFromOpaquePtr(arg1); 2822 QualType argT2 = QualType::getFromOpaquePtr(arg2); 2823 2824 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 2825 2826 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 2827} 2828 2829Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 2830 ExprTy *expr1, ExprTy *expr2, 2831 SourceLocation RPLoc) { 2832 Expr *CondExpr = static_cast<Expr*>(cond); 2833 Expr *LHSExpr = static_cast<Expr*>(expr1); 2834 Expr *RHSExpr = static_cast<Expr*>(expr2); 2835 2836 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 2837 2838 // The conditional expression is required to be a constant expression. 2839 llvm::APSInt condEval(32); 2840 SourceLocation ExpLoc; 2841 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 2842 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 2843 CondExpr->getSourceRange()); 2844 2845 // If the condition is > zero, then the AST type is the same as the LSHExpr. 2846 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 2847 RHSExpr->getType(); 2848 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 2849} 2850 2851//===----------------------------------------------------------------------===// 2852// Clang Extensions. 2853//===----------------------------------------------------------------------===// 2854 2855/// ActOnBlockStart - This callback is invoked when a block literal is started. 2856void Sema::ActOnBlockStart(SourceLocation CaretLoc, Scope *BlockScope) { 2857 // Analyze block parameters. 2858 BlockSemaInfo *BSI = new BlockSemaInfo(); 2859 2860 // Add BSI to CurBlock. 2861 BSI->PrevBlockInfo = CurBlock; 2862 CurBlock = BSI; 2863 2864 BSI->ReturnType = 0; 2865 BSI->TheScope = BlockScope; 2866 2867 BSI->TheDecl = BlockDecl::Create(Context, CurContext, CaretLoc); 2868 PushDeclContext(BSI->TheDecl); 2869} 2870 2871void Sema::ActOnBlockArguments(Declarator &ParamInfo) { 2872 // Analyze arguments to block. 2873 assert(ParamInfo.getTypeObject(0).Kind == DeclaratorChunk::Function && 2874 "Not a function declarator!"); 2875 DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getTypeObject(0).Fun; 2876 2877 CurBlock->hasPrototype = FTI.hasPrototype; 2878 CurBlock->isVariadic = true; 2879 2880 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs function that takes 2881 // no arguments, not a function that takes a single void argument. 2882 if (FTI.hasPrototype && 2883 FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2884 (!((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType().getCVRQualifiers() && 2885 ((ParmVarDecl *)FTI.ArgInfo[0].Param)->getType()->isVoidType())) { 2886 // empty arg list, don't push any params. 2887 CurBlock->isVariadic = false; 2888 } else if (FTI.hasPrototype) { 2889 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 2890 CurBlock->Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 2891 CurBlock->isVariadic = FTI.isVariadic; 2892 } 2893 CurBlock->TheDecl->setArgs(&CurBlock->Params[0], CurBlock->Params.size()); 2894 2895 for (BlockDecl::param_iterator AI = CurBlock->TheDecl->param_begin(), 2896 E = CurBlock->TheDecl->param_end(); AI != E; ++AI) 2897 // If this has an identifier, add it to the scope stack. 2898 if ((*AI)->getIdentifier()) 2899 PushOnScopeChains(*AI, CurBlock->TheScope); 2900} 2901 2902/// ActOnBlockError - If there is an error parsing a block, this callback 2903/// is invoked to pop the information about the block from the action impl. 2904void Sema::ActOnBlockError(SourceLocation CaretLoc, Scope *CurScope) { 2905 // Ensure that CurBlock is deleted. 2906 llvm::OwningPtr<BlockSemaInfo> CC(CurBlock); 2907 2908 // Pop off CurBlock, handle nested blocks. 2909 CurBlock = CurBlock->PrevBlockInfo; 2910 2911 // FIXME: Delete the ParmVarDecl objects as well??? 2912 2913} 2914 2915/// ActOnBlockStmtExpr - This is called when the body of a block statement 2916/// literal was successfully completed. ^(int x){...} 2917Sema::ExprResult Sema::ActOnBlockStmtExpr(SourceLocation CaretLoc, StmtTy *body, 2918 Scope *CurScope) { 2919 // Ensure that CurBlock is deleted. 2920 llvm::OwningPtr<BlockSemaInfo> BSI(CurBlock); 2921 llvm::OwningPtr<CompoundStmt> Body(static_cast<CompoundStmt*>(body)); 2922 2923 PopDeclContext(); 2924 2925 // Pop off CurBlock, handle nested blocks. 2926 CurBlock = CurBlock->PrevBlockInfo; 2927 2928 QualType RetTy = Context.VoidTy; 2929 if (BSI->ReturnType) 2930 RetTy = QualType(BSI->ReturnType, 0); 2931 2932 llvm::SmallVector<QualType, 8> ArgTypes; 2933 for (unsigned i = 0, e = BSI->Params.size(); i != e; ++i) 2934 ArgTypes.push_back(BSI->Params[i]->getType()); 2935 2936 QualType BlockTy; 2937 if (!BSI->hasPrototype) 2938 BlockTy = Context.getFunctionTypeNoProto(RetTy); 2939 else 2940 BlockTy = Context.getFunctionType(RetTy, &ArgTypes[0], ArgTypes.size(), 2941 BSI->isVariadic); 2942 2943 BlockTy = Context.getBlockPointerType(BlockTy); 2944 2945 BSI->TheDecl->setBody(Body.take()); 2946 return new BlockExpr(BSI->TheDecl, BlockTy); 2947} 2948 2949/// ExprsMatchFnType - return true if the Exprs in array Args have 2950/// QualTypes that match the QualTypes of the arguments of the FnType. 2951/// The number of arguments has already been validated to match the number of 2952/// arguments in FnType. 2953static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType, 2954 ASTContext &Context) { 2955 unsigned NumParams = FnType->getNumArgs(); 2956 for (unsigned i = 0; i != NumParams; ++i) { 2957 QualType ExprTy = Context.getCanonicalType(Args[i]->getType()); 2958 QualType ParmTy = Context.getCanonicalType(FnType->getArgType(i)); 2959 2960 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 2961 return false; 2962 } 2963 return true; 2964} 2965 2966Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 2967 SourceLocation *CommaLocs, 2968 SourceLocation BuiltinLoc, 2969 SourceLocation RParenLoc) { 2970 // __builtin_overload requires at least 2 arguments 2971 if (NumArgs < 2) 2972 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2973 SourceRange(BuiltinLoc, RParenLoc)); 2974 2975 // The first argument is required to be a constant expression. It tells us 2976 // the number of arguments to pass to each of the functions to be overloaded. 2977 Expr **Args = reinterpret_cast<Expr**>(args); 2978 Expr *NParamsExpr = Args[0]; 2979 llvm::APSInt constEval(32); 2980 SourceLocation ExpLoc; 2981 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 2982 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2983 NParamsExpr->getSourceRange()); 2984 2985 // Verify that the number of parameters is > 0 2986 unsigned NumParams = constEval.getZExtValue(); 2987 if (NumParams == 0) 2988 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2989 NParamsExpr->getSourceRange()); 2990 // Verify that we have at least 1 + NumParams arguments to the builtin. 2991 if ((NumParams + 1) > NumArgs) 2992 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2993 SourceRange(BuiltinLoc, RParenLoc)); 2994 2995 // Figure out the return type, by matching the args to one of the functions 2996 // listed after the parameters. 2997 OverloadExpr *OE = 0; 2998 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 2999 // UsualUnaryConversions will convert the function DeclRefExpr into a 3000 // pointer to function. 3001 Expr *Fn = UsualUnaryConversions(Args[i]); 3002 const FunctionTypeProto *FnType = 0; 3003 if (const PointerType *PT = Fn->getType()->getAsPointerType()) 3004 FnType = PT->getPointeeType()->getAsFunctionTypeProto(); 3005 3006 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 3007 // parameters, and the number of parameters must match the value passed to 3008 // the builtin. 3009 if (!FnType || (FnType->getNumArgs() != NumParams)) 3010 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 3011 Fn->getSourceRange()); 3012 3013 // Scan the parameter list for the FunctionType, checking the QualType of 3014 // each parameter against the QualTypes of the arguments to the builtin. 3015 // If they match, return a new OverloadExpr. 3016 if (ExprsMatchFnType(Args+1, FnType, Context)) { 3017 if (OE) 3018 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 3019 OE->getFn()->getSourceRange()); 3020 // Remember our match, and continue processing the remaining arguments 3021 // to catch any errors. 3022 OE = new OverloadExpr(Args, NumArgs, i, FnType->getResultType(), 3023 BuiltinLoc, RParenLoc); 3024 } 3025 } 3026 // Return the newly created OverloadExpr node, if we succeded in matching 3027 // exactly one of the candidate functions. 3028 if (OE) 3029 return OE; 3030 3031 // If we didn't find a matching function Expr in the __builtin_overload list 3032 // the return an error. 3033 std::string typeNames; 3034 for (unsigned i = 0; i != NumParams; ++i) { 3035 if (i != 0) typeNames += ", "; 3036 typeNames += Args[i+1]->getType().getAsString(); 3037 } 3038 3039 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 3040 SourceRange(BuiltinLoc, RParenLoc)); 3041} 3042 3043Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 3044 ExprTy *expr, TypeTy *type, 3045 SourceLocation RPLoc) { 3046 Expr *E = static_cast<Expr*>(expr); 3047 QualType T = QualType::getFromOpaquePtr(type); 3048 3049 InitBuiltinVaListType(); 3050 3051 // Get the va_list type 3052 QualType VaListType = Context.getBuiltinVaListType(); 3053 // Deal with implicit array decay; for example, on x86-64, 3054 // va_list is an array, but it's supposed to decay to 3055 // a pointer for va_arg. 3056 if (VaListType->isArrayType()) 3057 VaListType = Context.getArrayDecayedType(VaListType); 3058 // Make sure the input expression also decays appropriately. 3059 UsualUnaryConversions(E); 3060 3061 if (CheckAssignmentConstraints(VaListType, E->getType()) != Compatible) 3062 return Diag(E->getLocStart(), 3063 diag::err_first_argument_to_va_arg_not_of_type_va_list, 3064 E->getType().getAsString(), 3065 E->getSourceRange()); 3066 3067 // FIXME: Warn if a non-POD type is passed in. 3068 3069 return new VAArgExpr(BuiltinLoc, E, T, RPLoc); 3070} 3071 3072bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 3073 SourceLocation Loc, 3074 QualType DstType, QualType SrcType, 3075 Expr *SrcExpr, const char *Flavor) { 3076 // Decode the result (notice that AST's are still created for extensions). 3077 bool isInvalid = false; 3078 unsigned DiagKind; 3079 switch (ConvTy) { 3080 default: assert(0 && "Unknown conversion type"); 3081 case Compatible: return false; 3082 case PointerToInt: 3083 DiagKind = diag::ext_typecheck_convert_pointer_int; 3084 break; 3085 case IntToPointer: 3086 DiagKind = diag::ext_typecheck_convert_int_pointer; 3087 break; 3088 case IncompatiblePointer: 3089 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 3090 break; 3091 case FunctionVoidPointer: 3092 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 3093 break; 3094 case CompatiblePointerDiscardsQualifiers: 3095 // If the qualifiers lost were because we were applying the 3096 // (deprecated) C++ conversion from a string literal to a char* 3097 // (or wchar_t*), then there was no error (C++ 4.2p2). FIXME: 3098 // Ideally, this check would be performed in 3099 // CheckPointerTypesForAssignment. However, that would require a 3100 // bit of refactoring (so that the second argument is an 3101 // expression, rather than a type), which should be done as part 3102 // of a larger effort to fix CheckPointerTypesForAssignment for 3103 // C++ semantics. 3104 if (getLangOptions().CPlusPlus && 3105 IsStringLiteralToNonConstPointerConversion(SrcExpr, DstType)) 3106 return false; 3107 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 3108 break; 3109 case IntToBlockPointer: 3110 DiagKind = diag::err_int_to_block_pointer; 3111 break; 3112 case IncompatibleBlockPointer: 3113 DiagKind = diag::ext_typecheck_convert_incompatible_block_pointer; 3114 break; 3115 case BlockVoidPointer: 3116 DiagKind = diag::ext_typecheck_convert_pointer_void_block; 3117 break; 3118 case IncompatibleObjCQualifiedId: 3119 // FIXME: Diagnose the problem in ObjCQualifiedIdTypesAreCompatible, since 3120 // it can give a more specific diagnostic. 3121 DiagKind = diag::warn_incompatible_qualified_id; 3122 break; 3123 case Incompatible: 3124 DiagKind = diag::err_typecheck_convert_incompatible; 3125 isInvalid = true; 3126 break; 3127 } 3128 3129 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 3130 SrcExpr->getSourceRange()); 3131 return isInvalid; 3132} 3133