SemaExpr.cpp revision aa73eec076a2545671f78cb4e82536ec39f040eb
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 "SemaUtil.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/Expr.h" 18#include "clang/AST/ExprCXX.h" 19#include "clang/AST/ExprObjC.h" 20#include "clang/Parse/DeclSpec.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Lex/LiteralSupport.h" 23#include "clang/Basic/SourceManager.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/ADT/OwningPtr.h" 26#include "llvm/ADT/SmallString.h" 27#include "llvm/ADT/StringExtras.h" 28using namespace clang; 29 30/// ActOnStringLiteral - The specified tokens were lexed as pasted string 31/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 32/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 33/// multiple tokens. However, the common case is that StringToks points to one 34/// string. 35/// 36Action::ExprResult 37Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 38 assert(NumStringToks && "Must have at least one string!"); 39 40 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 41 if (Literal.hadError) 42 return ExprResult(true); 43 44 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 45 for (unsigned i = 0; i != NumStringToks; ++i) 46 StringTokLocs.push_back(StringToks[i].getLocation()); 47 48 // Verify that pascal strings aren't too large. 49 if (Literal.Pascal && Literal.GetStringLength() > 256) 50 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long, 51 SourceRange(StringToks[0].getLocation(), 52 StringToks[NumStringToks-1].getLocation())); 53 54 QualType StrTy = Context.CharTy; 55 if (Literal.AnyWide) StrTy = Context.getWcharType(); 56 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 57 58 // Get an array type for the string, according to C99 6.4.5. This includes 59 // the nul terminator character as well as the string length for pascal 60 // strings. 61 StrTy = Context.getConstantArrayType(StrTy, 62 llvm::APInt(32, Literal.GetStringLength()+1), 63 ArrayType::Normal, 0); 64 65 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 66 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 67 Literal.AnyWide, StrTy, 68 StringToks[0].getLocation(), 69 StringToks[NumStringToks-1].getLocation()); 70} 71 72 73/// ActOnIdentifierExpr - The parser read an identifier in expression context, 74/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 75/// identifier is used in a function call context. 76Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 77 IdentifierInfo &II, 78 bool HasTrailingLParen) { 79 // Could be enum-constant, value decl, instance variable, etc. 80 Decl *D = LookupDecl(&II, Decl::IDNS_Ordinary, S); 81 82 // If this reference is in an Objective-C method, then ivar lookup happens as 83 // well. 84 if (CurMethodDecl) { 85 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 86 // There are two cases to handle here. 1) scoped lookup could have failed, 87 // in which case we should look for an ivar. 2) scoped lookup could have 88 // found a decl, but that decl is outside the current method (i.e. a global 89 // variable). In these two cases, we do a lookup for an ivar with this 90 // name, if the lookup suceeds, we replace it our current decl. 91 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 92 ObjCInterfaceDecl *IFace = CurMethodDecl->getClassInterface(), *DeclClass; 93 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&II, DeclClass)) { 94 // FIXME: This should use a new expr for a direct reference, don't turn 95 // this into Self->ivar, just return a BareIVarExpr or something. 96 IdentifierInfo &II = Context.Idents.get("self"); 97 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 98 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 99 static_cast<Expr*>(SelfExpr.Val), true, true); 100 } 101 } 102 } 103 104 if (D == 0) { 105 // Otherwise, this could be an implicitly declared function reference (legal 106 // in C90, extension in C99). 107 if (HasTrailingLParen && 108 !getLangOptions().CPlusPlus) // Not in C++. 109 D = ImplicitlyDefineFunction(Loc, II, S); 110 else { 111 // If this name wasn't predeclared and if this is not a function call, 112 // diagnose the problem. 113 return Diag(Loc, diag::err_undeclared_var_use, II.getName()); 114 } 115 } 116 117 if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 118 // check if referencing an identifier with __attribute__((deprecated)). 119 if (VD->getAttr<DeprecatedAttr>()) 120 Diag(Loc, diag::warn_deprecated, VD->getName()); 121 122 // Only create DeclRefExpr's for valid Decl's. 123 if (VD->isInvalidDecl()) 124 return true; 125 return new DeclRefExpr(VD, VD->getType(), Loc); 126 } 127 128 if (isa<TypedefDecl>(D)) 129 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 130 if (isa<ObjCInterfaceDecl>(D)) 131 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 132 if (isa<NamespaceDecl>(D)) 133 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 134 135 assert(0 && "Invalid decl"); 136 abort(); 137} 138 139Sema::ExprResult Sema::ActOnPreDefinedExpr(SourceLocation Loc, 140 tok::TokenKind Kind) { 141 PreDefinedExpr::IdentType IT; 142 143 switch (Kind) { 144 default: assert(0 && "Unknown simple primary expr!"); 145 case tok::kw___func__: IT = PreDefinedExpr::Func; break; // [C99 6.4.2.2] 146 case tok::kw___FUNCTION__: IT = PreDefinedExpr::Function; break; 147 case tok::kw___PRETTY_FUNCTION__: IT = PreDefinedExpr::PrettyFunction; break; 148 } 149 150 // Verify that this is in a function context. 151 if (CurFunctionDecl == 0 && CurMethodDecl == 0) 152 return Diag(Loc, diag::err_predef_outside_function); 153 154 // Pre-defined identifiers are of type char[x], where x is the length of the 155 // string. 156 unsigned Length; 157 if (CurFunctionDecl) 158 Length = CurFunctionDecl->getIdentifier()->getLength(); 159 else 160 Length = CurMethodDecl->getSynthesizedMethodSize(); 161 162 llvm::APInt LengthI(32, Length + 1); 163 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 164 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 165 return new PreDefinedExpr(Loc, ResTy, IT); 166} 167 168Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 169 llvm::SmallString<16> CharBuffer; 170 CharBuffer.resize(Tok.getLength()); 171 const char *ThisTokBegin = &CharBuffer[0]; 172 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 173 174 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 175 Tok.getLocation(), PP); 176 if (Literal.hadError()) 177 return ExprResult(true); 178 179 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 180 181 return new CharacterLiteral(Literal.getValue(), type, Tok.getLocation()); 182} 183 184Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 185 // fast path for a single digit (which is quite common). A single digit 186 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 187 if (Tok.getLength() == 1) { 188 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 189 190 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 191 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 192 Context.IntTy, 193 Tok.getLocation())); 194 } 195 llvm::SmallString<512> IntegerBuffer; 196 IntegerBuffer.resize(Tok.getLength()); 197 const char *ThisTokBegin = &IntegerBuffer[0]; 198 199 // Get the spelling of the token, which eliminates trigraphs, etc. 200 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 201 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 202 Tok.getLocation(), PP); 203 if (Literal.hadError) 204 return ExprResult(true); 205 206 Expr *Res; 207 208 if (Literal.isFloatingLiteral()) { 209 QualType Ty; 210 const llvm::fltSemantics *Format; 211 212 if (Literal.isFloat) { 213 Ty = Context.FloatTy; 214 Format = Context.Target.getFloatFormat(); 215 } else if (!Literal.isLong) { 216 Ty = Context.DoubleTy; 217 Format = Context.Target.getDoubleFormat(); 218 } else { 219 Ty = Context.LongDoubleTy; 220 Format = Context.Target.getLongDoubleFormat(); 221 } 222 223 // isExact will be set by GetFloatValue(). 224 bool isExact = false; 225 226 Res = new FloatingLiteral(Literal.GetFloatValue(*Format,&isExact), &isExact, 227 Ty, Tok.getLocation()); 228 229 } else if (!Literal.isIntegerLiteral()) { 230 return ExprResult(true); 231 } else { 232 QualType Ty; 233 234 // long long is a C99 feature. 235 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 236 Literal.isLongLong) 237 Diag(Tok.getLocation(), diag::ext_longlong); 238 239 // Get the value in the widest-possible width. 240 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 241 242 if (Literal.GetIntegerValue(ResultVal)) { 243 // If this value didn't fit into uintmax_t, warn and force to ull. 244 Diag(Tok.getLocation(), diag::warn_integer_too_large); 245 Ty = Context.UnsignedLongLongTy; 246 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 247 "long long is not intmax_t?"); 248 } else { 249 // If this value fits into a ULL, try to figure out what else it fits into 250 // according to the rules of C99 6.4.4.1p5. 251 252 // Octal, Hexadecimal, and integers with a U suffix are allowed to 253 // be an unsigned int. 254 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 255 256 // Check from smallest to largest, picking the smallest type we can. 257 unsigned Width = 0; 258 if (!Literal.isLong && !Literal.isLongLong) { 259 // Are int/unsigned possibilities? 260 unsigned IntSize = Context.Target.getIntWidth(); 261 262 // Does it fit in a unsigned int? 263 if (ResultVal.isIntN(IntSize)) { 264 // Does it fit in a signed int? 265 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 266 Ty = Context.IntTy; 267 else if (AllowUnsigned) 268 Ty = Context.UnsignedIntTy; 269 Width = IntSize; 270 } 271 } 272 273 // Are long/unsigned long possibilities? 274 if (Ty.isNull() && !Literal.isLongLong) { 275 unsigned LongSize = Context.Target.getLongWidth(); 276 277 // Does it fit in a unsigned long? 278 if (ResultVal.isIntN(LongSize)) { 279 // Does it fit in a signed long? 280 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 281 Ty = Context.LongTy; 282 else if (AllowUnsigned) 283 Ty = Context.UnsignedLongTy; 284 Width = LongSize; 285 } 286 } 287 288 // Finally, check long long if needed. 289 if (Ty.isNull()) { 290 unsigned LongLongSize = Context.Target.getLongLongWidth(); 291 292 // Does it fit in a unsigned long long? 293 if (ResultVal.isIntN(LongLongSize)) { 294 // Does it fit in a signed long long? 295 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 296 Ty = Context.LongLongTy; 297 else if (AllowUnsigned) 298 Ty = Context.UnsignedLongLongTy; 299 Width = LongLongSize; 300 } 301 } 302 303 // If we still couldn't decide a type, we probably have something that 304 // does not fit in a signed long long, but has no U suffix. 305 if (Ty.isNull()) { 306 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 307 Ty = Context.UnsignedLongLongTy; 308 Width = Context.Target.getLongLongWidth(); 309 } 310 311 if (ResultVal.getBitWidth() != Width) 312 ResultVal.trunc(Width); 313 } 314 315 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 316 } 317 318 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 319 if (Literal.isImaginary) 320 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 321 322 return Res; 323} 324 325Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 326 ExprTy *Val) { 327 Expr *E = (Expr *)Val; 328 assert((E != 0) && "ActOnParenExpr() missing expr"); 329 return new ParenExpr(L, R, E); 330} 331 332/// The UsualUnaryConversions() function is *not* called by this routine. 333/// See C99 6.3.2.1p[2-4] for more details. 334QualType Sema::CheckSizeOfAlignOfOperand(QualType exprType, 335 SourceLocation OpLoc, bool isSizeof) { 336 // C99 6.5.3.4p1: 337 if (isa<FunctionType>(exprType) && isSizeof) 338 // alignof(function) is allowed. 339 Diag(OpLoc, diag::ext_sizeof_function_type); 340 else if (exprType->isVoidType()) 341 Diag(OpLoc, diag::ext_sizeof_void_type, isSizeof ? "sizeof" : "__alignof"); 342 else if (exprType->isIncompleteType()) { 343 Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 344 diag::err_alignof_incomplete_type, 345 exprType.getAsString()); 346 return QualType(); // error 347 } 348 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 349 return Context.getSizeType(); 350} 351 352Action::ExprResult Sema:: 353ActOnSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, 354 SourceLocation LPLoc, TypeTy *Ty, 355 SourceLocation RPLoc) { 356 // If error parsing type, ignore. 357 if (Ty == 0) return true; 358 359 // Verify that this is a valid expression. 360 QualType ArgTy = QualType::getFromOpaquePtr(Ty); 361 362 QualType resultType = CheckSizeOfAlignOfOperand(ArgTy, OpLoc, isSizeof); 363 364 if (resultType.isNull()) 365 return true; 366 return new SizeOfAlignOfTypeExpr(isSizeof, ArgTy, resultType, OpLoc, RPLoc); 367} 368 369QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 370 DefaultFunctionArrayConversion(V); 371 372 // These operators return the element type of a complex type. 373 if (const ComplexType *CT = V->getType()->getAsComplexType()) 374 return CT->getElementType(); 375 376 // Otherwise they pass through real integer and floating point types here. 377 if (V->getType()->isArithmeticType()) 378 return V->getType(); 379 380 // Reject anything else. 381 Diag(Loc, diag::err_realimag_invalid_type, V->getType().getAsString()); 382 return QualType(); 383} 384 385 386 387Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 388 tok::TokenKind Kind, 389 ExprTy *Input) { 390 UnaryOperator::Opcode Opc; 391 switch (Kind) { 392 default: assert(0 && "Unknown unary op!"); 393 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 394 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 395 } 396 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 397 if (result.isNull()) 398 return true; 399 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 400} 401 402Action::ExprResult Sema:: 403ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 404 ExprTy *Idx, SourceLocation RLoc) { 405 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 406 407 // Perform default conversions. 408 DefaultFunctionArrayConversion(LHSExp); 409 DefaultFunctionArrayConversion(RHSExp); 410 411 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 412 413 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 414 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 415 // in the subscript position. As a result, we need to derive the array base 416 // and index from the expression types. 417 Expr *BaseExpr, *IndexExpr; 418 QualType ResultType; 419 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 420 BaseExpr = LHSExp; 421 IndexExpr = RHSExp; 422 // FIXME: need to deal with const... 423 ResultType = PTy->getPointeeType(); 424 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 425 // Handle the uncommon case of "123[Ptr]". 426 BaseExpr = RHSExp; 427 IndexExpr = LHSExp; 428 // FIXME: need to deal with const... 429 ResultType = PTy->getPointeeType(); 430 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 431 BaseExpr = LHSExp; // vectors: V[123] 432 IndexExpr = RHSExp; 433 434 // Component access limited to variables (reject vec4.rg[1]). 435 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 436 !isa<ExtVectorElementExpr>(BaseExpr)) 437 return Diag(LLoc, diag::err_ext_vector_component_access, 438 SourceRange(LLoc, RLoc)); 439 // FIXME: need to deal with const... 440 ResultType = VTy->getElementType(); 441 } else { 442 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value, 443 RHSExp->getSourceRange()); 444 } 445 // C99 6.5.2.1p1 446 if (!IndexExpr->getType()->isIntegerType()) 447 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript, 448 IndexExpr->getSourceRange()); 449 450 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 451 // the following check catches trying to index a pointer to a function (e.g. 452 // void (*)(int)) and pointers to incomplete types. Functions are not 453 // objects in C99. 454 if (!ResultType->isObjectType()) 455 return Diag(BaseExpr->getLocStart(), 456 diag::err_typecheck_subscript_not_object, 457 BaseExpr->getType().getAsString(), BaseExpr->getSourceRange()); 458 459 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 460} 461 462QualType Sema:: 463CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 464 IdentifierInfo &CompName, SourceLocation CompLoc) { 465 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 466 467 // This flag determines whether or not the component is to be treated as a 468 // special name, or a regular GLSL-style component access. 469 bool SpecialComponent = false; 470 471 // The vector accessor can't exceed the number of elements. 472 const char *compStr = CompName.getName(); 473 if (strlen(compStr) > vecType->getNumElements()) { 474 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 475 baseType.getAsString(), SourceRange(CompLoc)); 476 return QualType(); 477 } 478 479 // Check that we've found one of the special components, or that the component 480 // names must come from the same set. 481 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 482 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 483 SpecialComponent = true; 484 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 485 do 486 compStr++; 487 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 488 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 489 do 490 compStr++; 491 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 492 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 493 do 494 compStr++; 495 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 496 } 497 498 if (!SpecialComponent && *compStr) { 499 // We didn't get to the end of the string. This means the component names 500 // didn't come from the same set *or* we encountered an illegal name. 501 Diag(OpLoc, diag::err_ext_vector_component_name_illegal, 502 std::string(compStr,compStr+1), SourceRange(CompLoc)); 503 return QualType(); 504 } 505 // Each component accessor can't exceed the vector type. 506 compStr = CompName.getName(); 507 while (*compStr) { 508 if (vecType->isAccessorWithinNumElements(*compStr)) 509 compStr++; 510 else 511 break; 512 } 513 if (!SpecialComponent && *compStr) { 514 // We didn't get to the end of the string. This means a component accessor 515 // exceeds the number of elements in the vector. 516 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 517 baseType.getAsString(), SourceRange(CompLoc)); 518 return QualType(); 519 } 520 521 // If we have a special component name, verify that the current vector length 522 // is an even number, since all special component names return exactly half 523 // the elements. 524 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 525 return QualType(); 526 } 527 528 // The component accessor looks fine - now we need to compute the actual type. 529 // The vector type is implied by the component accessor. For example, 530 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 531 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 532 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 533 : strlen(CompName.getName()); 534 if (CompSize == 1) 535 return vecType->getElementType(); 536 537 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 538 // Now look up the TypeDefDecl from the vector type. Without this, 539 // diagostics look bad. We want extended vector types to appear built-in. 540 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 541 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 542 return Context.getTypedefType(ExtVectorDecls[i]); 543 } 544 return VT; // should never get here (a typedef type should always be found). 545} 546 547Action::ExprResult Sema:: 548ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 549 tok::TokenKind OpKind, SourceLocation MemberLoc, 550 IdentifierInfo &Member) { 551 Expr *BaseExpr = static_cast<Expr *>(Base); 552 assert(BaseExpr && "no record expression"); 553 554 // Perform default conversions. 555 DefaultFunctionArrayConversion(BaseExpr); 556 557 QualType BaseType = BaseExpr->getType(); 558 assert(!BaseType.isNull() && "no type for member expression"); 559 560 if (OpKind == tok::arrow) { 561 if (const PointerType *PT = BaseType->getAsPointerType()) 562 BaseType = PT->getPointeeType(); 563 else 564 return Diag(OpLoc, diag::err_typecheck_member_reference_arrow, 565 SourceRange(MemberLoc)); 566 } 567 // The base type is either a record or an ExtVectorType. 568 if (const RecordType *RTy = BaseType->getAsRecordType()) { 569 RecordDecl *RDecl = RTy->getDecl(); 570 if (RTy->isIncompleteType()) 571 return Diag(OpLoc, diag::err_typecheck_incomplete_tag, RDecl->getName(), 572 BaseExpr->getSourceRange()); 573 // The record definition is complete, now make sure the member is valid. 574 FieldDecl *MemberDecl = RDecl->getMember(&Member); 575 if (!MemberDecl) 576 return Diag(OpLoc, diag::err_typecheck_no_member, Member.getName(), 577 SourceRange(MemberLoc)); 578 579 // Figure out the type of the member; see C99 6.5.2.3p3 580 // FIXME: Handle address space modifiers 581 QualType MemberType = MemberDecl->getType(); 582 unsigned combinedQualifiers = 583 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 584 MemberType = MemberType.getQualifiedType(combinedQualifiers); 585 586 return new MemberExpr(BaseExpr, OpKind==tok::arrow, MemberDecl, 587 MemberLoc, MemberType); 588 } else if (BaseType->isExtVectorType() && OpKind == tok::period) { 589 // Component access limited to variables (reject vec4.rg.g). 590 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 591 !isa<ExtVectorElementExpr>(BaseExpr)) 592 return Diag(OpLoc, diag::err_ext_vector_component_access, 593 SourceRange(MemberLoc)); 594 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 595 if (ret.isNull()) 596 return true; 597 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 598 } else if (BaseType->isObjCInterfaceType()) { 599 ObjCInterfaceDecl *IFace; 600 if (isa<ObjCInterfaceType>(BaseType.getCanonicalType())) 601 IFace = dyn_cast<ObjCInterfaceType>(BaseType)->getDecl(); 602 else 603 IFace = dyn_cast<ObjCQualifiedInterfaceType>(BaseType)->getDecl(); 604 ObjCInterfaceDecl *clsDeclared; 605 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&Member, clsDeclared)) 606 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 607 OpKind==tok::arrow); 608 } else if (isObjCObjectPointerType(BaseType)) { 609 PointerType *pointerType = static_cast<PointerType*>(BaseType.getTypePtr()); 610 BaseType = pointerType->getPointeeType(); 611 ObjCInterfaceDecl *IFace; 612 if (isa<ObjCInterfaceType>(BaseType.getCanonicalType())) 613 IFace = dyn_cast<ObjCInterfaceType>(BaseType)->getDecl(); 614 else 615 IFace = dyn_cast<ObjCQualifiedInterfaceType>(BaseType)->getDecl(); 616 ObjCInterfaceDecl *clsDeclared; 617 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&Member, clsDeclared)) 618 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 619 OpKind==tok::arrow); 620 // Check for properties. 621 if (OpKind==tok::period) { 622 // Before we look for explicit property declarations, we check for 623 // nullary methods (which allow '.' notation). 624 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 625 ObjCMethodDecl *MD = IFace->lookupInstanceMethod(Sel); 626 if (MD) 627 return new ObjCPropertyRefExpr(MD, MD->getResultType(), 628 MemberLoc, BaseExpr); 629 // FIXME: Need to deal with setter methods that take 1 argument. E.g.: 630 // @interface NSBundle : NSObject {} 631 // - (NSString *)bundlePath; 632 // - (void)setBundlePath:(NSString *)x; 633 // @end 634 // void someMethod() { frameworkBundle.bundlePath = 0; } 635 // 636 // FIXME: lookup explicit properties... 637 } 638 } 639 return Diag(OpLoc, diag::err_typecheck_member_reference_structUnion, 640 SourceRange(MemberLoc)); 641} 642 643/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 644/// This provides the location of the left/right parens and a list of comma 645/// locations. 646Action::ExprResult Sema:: 647ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 648 ExprTy **args, unsigned NumArgs, 649 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 650 Expr *Fn = static_cast<Expr *>(fn); 651 Expr **Args = reinterpret_cast<Expr**>(args); 652 assert(Fn && "no function call expression"); 653 FunctionDecl *FDecl = NULL; 654 655 // Promote the function operand. 656 UsualUnaryConversions(Fn); 657 658 // If we're directly calling a function, get the declaration for 659 // that function. 660 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 661 if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr())) 662 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 663 664 // Make the call expr early, before semantic checks. This guarantees cleanup 665 // of arguments and function on error. 666 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 667 Context.BoolTy, RParenLoc)); 668 669 // C99 6.5.2.2p1 - "The expression that denotes the called function shall have 670 // type pointer to function". 671 const PointerType *PT = Fn->getType()->getAsPointerType(); 672 if (PT == 0) 673 return Diag(Fn->getLocStart(), diag::err_typecheck_call_not_function, 674 SourceRange(Fn->getLocStart(), RParenLoc)); 675 const FunctionType *FuncT = PT->getPointeeType()->getAsFunctionType(); 676 if (FuncT == 0) 677 return Diag(Fn->getLocStart(), diag::err_typecheck_call_not_function, 678 SourceRange(Fn->getLocStart(), RParenLoc)); 679 680 // We know the result type of the call, set it. 681 TheCall->setType(FuncT->getResultType()); 682 683 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 684 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 685 // assignment, to the types of the corresponding parameter, ... 686 unsigned NumArgsInProto = Proto->getNumArgs(); 687 unsigned NumArgsToCheck = NumArgs; 688 689 // If too few arguments are available (and we don't have default 690 // arguments for the remaining parameters), don't make the call. 691 if (NumArgs < NumArgsInProto) { 692 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 693 // Use default arguments for missing arguments 694 NumArgsToCheck = NumArgsInProto; 695 TheCall->setNumArgs(NumArgsInProto); 696 } else 697 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 698 Fn->getSourceRange()); 699 } 700 701 // If too many are passed and not variadic, error on the extras and drop 702 // them. 703 if (NumArgs > NumArgsInProto) { 704 if (!Proto->isVariadic()) { 705 Diag(Args[NumArgsInProto]->getLocStart(), 706 diag::err_typecheck_call_too_many_args, Fn->getSourceRange(), 707 SourceRange(Args[NumArgsInProto]->getLocStart(), 708 Args[NumArgs-1]->getLocEnd())); 709 // This deletes the extra arguments. 710 TheCall->setNumArgs(NumArgsInProto); 711 } 712 NumArgsToCheck = NumArgsInProto; 713 } 714 715 // Continue to check argument types (even if we have too few/many args). 716 for (unsigned i = 0; i != NumArgsToCheck; i++) { 717 QualType ProtoArgType = Proto->getArgType(i); 718 719 Expr *Arg; 720 if (i < NumArgs) 721 Arg = Args[i]; 722 else 723 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 724 QualType ArgType = Arg->getType(); 725 726 // Compute implicit casts from the operand to the formal argument type. 727 AssignConvertType ConvTy = 728 CheckSingleAssignmentConstraints(ProtoArgType, Arg); 729 TheCall->setArg(i, Arg); 730 731 if (DiagnoseAssignmentResult(ConvTy, Arg->getLocStart(), ProtoArgType, 732 ArgType, Arg, "passing")) 733 return true; 734 } 735 736 // If this is a variadic call, handle args passed through "...". 737 if (Proto->isVariadic()) { 738 // Promote the arguments (C99 6.5.2.2p7). 739 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 740 Expr *Arg = Args[i]; 741 DefaultArgumentPromotion(Arg); 742 TheCall->setArg(i, Arg); 743 } 744 } 745 } else { 746 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 747 748 // Promote the arguments (C99 6.5.2.2p6). 749 for (unsigned i = 0; i != NumArgs; i++) { 750 Expr *Arg = Args[i]; 751 DefaultArgumentPromotion(Arg); 752 TheCall->setArg(i, Arg); 753 } 754 } 755 756 // Do special checking on direct calls to functions. 757 if (FDecl) 758 return CheckFunctionCall(FDecl, TheCall.take()); 759 760 return TheCall.take(); 761} 762 763Action::ExprResult Sema:: 764ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 765 SourceLocation RParenLoc, ExprTy *InitExpr) { 766 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 767 QualType literalType = QualType::getFromOpaquePtr(Ty); 768 // FIXME: put back this assert when initializers are worked out. 769 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 770 Expr *literalExpr = static_cast<Expr*>(InitExpr); 771 772 if (literalType->isArrayType()) { 773 if (literalType->getAsVariableArrayType()) 774 return Diag(LParenLoc, 775 diag::err_variable_object_no_init, 776 SourceRange(LParenLoc, 777 literalExpr->getSourceRange().getEnd())); 778 } else if (literalType->isIncompleteType()) { 779 return Diag(LParenLoc, 780 diag::err_typecheck_decl_incomplete_type, 781 literalType.getAsString(), 782 SourceRange(LParenLoc, 783 literalExpr->getSourceRange().getEnd())); 784 } 785 786 if (CheckInitializerTypes(literalExpr, literalType)) 787 return true; 788 789 bool isFileScope = !CurFunctionDecl && !CurMethodDecl; 790 if (isFileScope) { // 6.5.2.5p3 791 if (CheckForConstantInitializer(literalExpr, literalType)) 792 return true; 793 } 794 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, isFileScope); 795} 796 797Action::ExprResult Sema:: 798ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 799 SourceLocation RBraceLoc) { 800 Expr **InitList = reinterpret_cast<Expr**>(initlist); 801 802 // Semantic analysis for initializers is done by ActOnDeclarator() and 803 // CheckInitializer() - it requires knowledge of the object being intialized. 804 805 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc); 806 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 807 return E; 808} 809 810bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 811 assert(VectorTy->isVectorType() && "Not a vector type!"); 812 813 if (Ty->isVectorType() || Ty->isIntegerType()) { 814 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 815 return Diag(R.getBegin(), 816 Ty->isVectorType() ? 817 diag::err_invalid_conversion_between_vectors : 818 diag::err_invalid_conversion_between_vector_and_integer, 819 VectorTy.getAsString().c_str(), 820 Ty.getAsString().c_str(), R); 821 } else 822 return Diag(R.getBegin(), 823 diag::err_invalid_conversion_between_vector_and_scalar, 824 VectorTy.getAsString().c_str(), 825 Ty.getAsString().c_str(), R); 826 827 return false; 828} 829 830Action::ExprResult Sema:: 831ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 832 SourceLocation RParenLoc, ExprTy *Op) { 833 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 834 835 Expr *castExpr = static_cast<Expr*>(Op); 836 QualType castType = QualType::getFromOpaquePtr(Ty); 837 838 UsualUnaryConversions(castExpr); 839 840 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 841 // type needs to be scalar. 842 if (!castType->isVoidType()) { // Cast to void allows any expr type. 843 if (!castType->isScalarType() && !castType->isVectorType()) 844 return Diag(LParenLoc, diag::err_typecheck_cond_expect_scalar, 845 castType.getAsString(), SourceRange(LParenLoc, RParenLoc)); 846 if (!castExpr->getType()->isScalarType() && 847 !castExpr->getType()->isVectorType()) 848 return Diag(castExpr->getLocStart(), 849 diag::err_typecheck_expect_scalar_operand, 850 castExpr->getType().getAsString(),castExpr->getSourceRange()); 851 852 if (castExpr->getType()->isVectorType()) { 853 if (CheckVectorCast(SourceRange(LParenLoc, RParenLoc), 854 castExpr->getType(), castType)) 855 return true; 856 } else if (castType->isVectorType()) { 857 if (CheckVectorCast(SourceRange(LParenLoc, RParenLoc), 858 castType, castExpr->getType())) 859 return true; 860 } 861 } 862 return new CastExpr(castType, castExpr, LParenLoc); 863} 864 865/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 866/// In that case, lex = cond. 867inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 868 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 869 UsualUnaryConversions(cond); 870 UsualUnaryConversions(lex); 871 UsualUnaryConversions(rex); 872 QualType condT = cond->getType(); 873 QualType lexT = lex->getType(); 874 QualType rexT = rex->getType(); 875 876 // first, check the condition. 877 if (!condT->isScalarType()) { // C99 6.5.15p2 878 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 879 condT.getAsString()); 880 return QualType(); 881 } 882 883 // Now check the two expressions. 884 885 // If both operands have arithmetic type, do the usual arithmetic conversions 886 // to find a common type: C99 6.5.15p3,5. 887 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 888 UsualArithmeticConversions(lex, rex); 889 return lex->getType(); 890 } 891 892 // If both operands are the same structure or union type, the result is that 893 // type. 894 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 895 if (const RecordType *RHSRT = rexT->getAsRecordType()) 896 if (LHSRT->getDecl() == RHSRT->getDecl()) 897 // "If both the operands have structure or union type, the result has 898 // that type." This implies that CV qualifiers are dropped. 899 return lexT.getUnqualifiedType(); 900 } 901 902 // C99 6.5.15p5: "If both operands have void type, the result has void type." 903 // The following || allows only one side to be void (a GCC-ism). 904 if (lexT->isVoidType() || rexT->isVoidType()) { 905 if (!lexT->isVoidType()) 906 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 907 rex->getSourceRange()); 908 if (!rexT->isVoidType()) 909 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 910 lex->getSourceRange()); 911 return lexT.getUnqualifiedType(); 912 } 913 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 914 // the type of the other operand." 915 if (lexT->isPointerType() && rex->isNullPointerConstant(Context)) { 916 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 917 return lexT; 918 } 919 if (rexT->isPointerType() && lex->isNullPointerConstant(Context)) { 920 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 921 return rexT; 922 } 923 // Handle the case where both operands are pointers before we handle null 924 // pointer constants in case both operands are null pointer constants. 925 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 926 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 927 // get the "pointed to" types 928 QualType lhptee = LHSPT->getPointeeType(); 929 QualType rhptee = RHSPT->getPointeeType(); 930 931 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 932 if (lhptee->isVoidType() && 933 rhptee->isIncompleteOrObjectType()) { 934 // Figure out necessary qualifiers (C99 6.5.15p6) 935 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 936 QualType destType = Context.getPointerType(destPointee); 937 ImpCastExprToType(lex, destType); // add qualifiers if necessary 938 ImpCastExprToType(rex, destType); // promote to void* 939 return destType; 940 } 941 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 942 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 943 QualType destType = Context.getPointerType(destPointee); 944 ImpCastExprToType(lex, destType); // add qualifiers if necessary 945 ImpCastExprToType(rex, destType); // promote to void* 946 return destType; 947 } 948 949 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 950 rhptee.getUnqualifiedType())) { 951 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 952 lexT.getAsString(), rexT.getAsString(), 953 lex->getSourceRange(), rex->getSourceRange()); 954 // In this situation, we assume void* type. No especially good 955 // reason, but this is what gcc does, and we do have to pick 956 // to get a consistent AST. 957 QualType voidPtrTy = Context.getPointerType(Context.VoidTy); 958 ImpCastExprToType(lex, voidPtrTy); 959 ImpCastExprToType(rex, voidPtrTy); 960 return voidPtrTy; 961 } 962 // The pointer types are compatible. 963 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 964 // differently qualified versions of compatible types, the result type is 965 // a pointer to an appropriately qualified version of the *composite* 966 // type. 967 // FIXME: Need to calculate the composite type. 968 // FIXME: Need to add qualifiers 969 QualType compositeType = lexT; 970 ImpCastExprToType(lex, compositeType); 971 ImpCastExprToType(rex, compositeType); 972 return compositeType; 973 } 974 } 975 // Need to handle "id<xx>" explicitly. Unlike "id", whose canonical type 976 // evaluates to "struct objc_object *" (and is handled above when comparing 977 // id with statically typed objects). FIXME: Do we need an ImpCastExprToType? 978 if (lexT->isObjCQualifiedIdType() || rexT->isObjCQualifiedIdType()) { 979 if (ObjCQualifiedIdTypesAreCompatible(lexT, rexT, true)) 980 return Context.getObjCIdType(); 981 } 982 // Otherwise, the operands are not compatible. 983 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 984 lexT.getAsString(), rexT.getAsString(), 985 lex->getSourceRange(), rex->getSourceRange()); 986 return QualType(); 987} 988 989/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 990/// in the case of a the GNU conditional expr extension. 991Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 992 SourceLocation ColonLoc, 993 ExprTy *Cond, ExprTy *LHS, 994 ExprTy *RHS) { 995 Expr *CondExpr = (Expr *) Cond; 996 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 997 998 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 999 // was the condition. 1000 bool isLHSNull = LHSExpr == 0; 1001 if (isLHSNull) 1002 LHSExpr = CondExpr; 1003 1004 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 1005 RHSExpr, QuestionLoc); 1006 if (result.isNull()) 1007 return true; 1008 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1009 RHSExpr, result); 1010} 1011 1012/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 1013/// do not have a prototype. Arguments that have type float are promoted to 1014/// double. All other argument types are converted by UsualUnaryConversions(). 1015void Sema::DefaultArgumentPromotion(Expr *&Expr) { 1016 QualType Ty = Expr->getType(); 1017 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 1018 1019 if (Ty == Context.FloatTy) 1020 ImpCastExprToType(Expr, Context.DoubleTy); 1021 else 1022 UsualUnaryConversions(Expr); 1023} 1024 1025/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 1026void Sema::DefaultFunctionArrayConversion(Expr *&E) { 1027 QualType Ty = E->getType(); 1028 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 1029 1030 if (const ReferenceType *ref = Ty->getAsReferenceType()) { 1031 ImpCastExprToType(E, ref->getPointeeType()); // C++ [expr] 1032 Ty = E->getType(); 1033 } 1034 if (Ty->isFunctionType()) 1035 ImpCastExprToType(E, Context.getPointerType(Ty)); 1036 else if (Ty->isArrayType()) 1037 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 1038} 1039 1040/// UsualUnaryConversions - Performs various conversions that are common to most 1041/// operators (C99 6.3). The conversions of array and function types are 1042/// sometimes surpressed. For example, the array->pointer conversion doesn't 1043/// apply if the array is an argument to the sizeof or address (&) operators. 1044/// In these instances, this routine should *not* be called. 1045Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 1046 QualType Ty = Expr->getType(); 1047 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 1048 1049 if (const ReferenceType *Ref = Ty->getAsReferenceType()) { 1050 ImpCastExprToType(Expr, Ref->getPointeeType()); // C++ [expr] 1051 Ty = Expr->getType(); 1052 } 1053 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 1054 ImpCastExprToType(Expr, Context.IntTy); 1055 else 1056 DefaultFunctionArrayConversion(Expr); 1057 1058 return Expr; 1059} 1060 1061/// UsualArithmeticConversions - Performs various conversions that are common to 1062/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 1063/// routine returns the first non-arithmetic type found. The client is 1064/// responsible for emitting appropriate error diagnostics. 1065/// FIXME: verify the conversion rules for "complex int" are consistent with 1066/// GCC. 1067QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 1068 bool isCompAssign) { 1069 if (!isCompAssign) { 1070 UsualUnaryConversions(lhsExpr); 1071 UsualUnaryConversions(rhsExpr); 1072 } 1073 // For conversion purposes, we ignore any qualifiers. 1074 // For example, "const float" and "float" are equivalent. 1075 QualType lhs = lhsExpr->getType().getCanonicalType().getUnqualifiedType(); 1076 QualType rhs = rhsExpr->getType().getCanonicalType().getUnqualifiedType(); 1077 1078 // If both types are identical, no conversion is needed. 1079 if (lhs == rhs) 1080 return lhs; 1081 1082 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 1083 // The caller can deal with this (e.g. pointer + int). 1084 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 1085 return lhs; 1086 1087 // At this point, we have two different arithmetic types. 1088 1089 // Handle complex types first (C99 6.3.1.8p1). 1090 if (lhs->isComplexType() || rhs->isComplexType()) { 1091 // if we have an integer operand, the result is the complex type. 1092 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 1093 // convert the rhs to the lhs complex type. 1094 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1095 return lhs; 1096 } 1097 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 1098 // convert the lhs to the rhs complex type. 1099 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 1100 return rhs; 1101 } 1102 // This handles complex/complex, complex/float, or float/complex. 1103 // When both operands are complex, the shorter operand is converted to the 1104 // type of the longer, and that is the type of the result. This corresponds 1105 // to what is done when combining two real floating-point operands. 1106 // The fun begins when size promotion occur across type domains. 1107 // From H&S 6.3.4: When one operand is complex and the other is a real 1108 // floating-point type, the less precise type is converted, within it's 1109 // real or complex domain, to the precision of the other type. For example, 1110 // when combining a "long double" with a "double _Complex", the 1111 // "double _Complex" is promoted to "long double _Complex". 1112 int result = Context.getFloatingTypeOrder(lhs, rhs); 1113 1114 if (result > 0) { // The left side is bigger, convert rhs. 1115 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 1116 if (!isCompAssign) 1117 ImpCastExprToType(rhsExpr, rhs); 1118 } else if (result < 0) { // The right side is bigger, convert lhs. 1119 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 1120 if (!isCompAssign) 1121 ImpCastExprToType(lhsExpr, lhs); 1122 } 1123 // At this point, lhs and rhs have the same rank/size. Now, make sure the 1124 // domains match. This is a requirement for our implementation, C99 1125 // does not require this promotion. 1126 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 1127 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 1128 if (!isCompAssign) 1129 ImpCastExprToType(lhsExpr, rhs); 1130 return rhs; 1131 } else { // handle "_Complex double, double". 1132 if (!isCompAssign) 1133 ImpCastExprToType(rhsExpr, lhs); 1134 return lhs; 1135 } 1136 } 1137 return lhs; // The domain/size match exactly. 1138 } 1139 // Now handle "real" floating types (i.e. float, double, long double). 1140 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 1141 // if we have an integer operand, the result is the real floating type. 1142 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 1143 // convert rhs to the lhs floating point type. 1144 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1145 return lhs; 1146 } 1147 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 1148 // convert lhs to the rhs floating point type. 1149 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 1150 return rhs; 1151 } 1152 // We have two real floating types, float/complex combos were handled above. 1153 // Convert the smaller operand to the bigger result. 1154 int result = Context.getFloatingTypeOrder(lhs, rhs); 1155 1156 if (result > 0) { // convert the rhs 1157 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1158 return lhs; 1159 } 1160 if (result < 0) { // convert the lhs 1161 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 1162 return rhs; 1163 } 1164 assert(0 && "Sema::UsualArithmeticConversions(): illegal float comparison"); 1165 } 1166 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 1167 // Handle GCC complex int extension. 1168 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 1169 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 1170 1171 if (lhsComplexInt && rhsComplexInt) { 1172 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 1173 rhsComplexInt->getElementType()) >= 0) { 1174 // convert the rhs 1175 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1176 return lhs; 1177 } 1178 if (!isCompAssign) 1179 ImpCastExprToType(lhsExpr, rhs); // convert the lhs 1180 return rhs; 1181 } else if (lhsComplexInt && rhs->isIntegerType()) { 1182 // convert the rhs to the lhs complex type. 1183 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1184 return lhs; 1185 } else if (rhsComplexInt && lhs->isIntegerType()) { 1186 // convert the lhs to the rhs complex type. 1187 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 1188 return rhs; 1189 } 1190 } 1191 // Finally, we have two differing integer types. 1192 if (Context.getIntegerTypeOrder(lhs, rhs) >= 0) { // convert the rhs 1193 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1194 return lhs; 1195 } 1196 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 1197 return rhs; 1198} 1199 1200// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1201// being closely modeled after the C99 spec:-). The odd characteristic of this 1202// routine is it effectively iqnores the qualifiers on the top level pointee. 1203// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1204// FIXME: add a couple examples in this comment. 1205Sema::AssignConvertType 1206Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1207 QualType lhptee, rhptee; 1208 1209 // get the "pointed to" type (ignoring qualifiers at the top level) 1210 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1211 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1212 1213 // make sure we operate on the canonical type 1214 lhptee = lhptee.getCanonicalType(); 1215 rhptee = rhptee.getCanonicalType(); 1216 1217 AssignConvertType ConvTy = Compatible; 1218 1219 // C99 6.5.16.1p1: This following citation is common to constraints 1220 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1221 // qualifiers of the type *pointed to* by the right; 1222 // FIXME: Handle ASQualType 1223 if ((lhptee.getCVRQualifiers() & rhptee.getCVRQualifiers()) != 1224 rhptee.getCVRQualifiers()) 1225 ConvTy = CompatiblePointerDiscardsQualifiers; 1226 1227 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1228 // incomplete type and the other is a pointer to a qualified or unqualified 1229 // version of void... 1230 if (lhptee->isVoidType()) { 1231 if (rhptee->isIncompleteOrObjectType()) 1232 return ConvTy; 1233 1234 // As an extension, we allow cast to/from void* to function pointer. 1235 assert(rhptee->isFunctionType()); 1236 return FunctionVoidPointer; 1237 } 1238 1239 if (rhptee->isVoidType()) { 1240 if (lhptee->isIncompleteOrObjectType()) 1241 return ConvTy; 1242 1243 // As an extension, we allow cast to/from void* to function pointer. 1244 assert(lhptee->isFunctionType()); 1245 return FunctionVoidPointer; 1246 } 1247 1248 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1249 // unqualified versions of compatible types, ... 1250 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1251 rhptee.getUnqualifiedType())) 1252 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1253 return ConvTy; 1254} 1255 1256/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1257/// has code to accommodate several GCC extensions when type checking 1258/// pointers. Here are some objectionable examples that GCC considers warnings: 1259/// 1260/// int a, *pint; 1261/// short *pshort; 1262/// struct foo *pfoo; 1263/// 1264/// pint = pshort; // warning: assignment from incompatible pointer type 1265/// a = pint; // warning: assignment makes integer from pointer without a cast 1266/// pint = a; // warning: assignment makes pointer from integer without a cast 1267/// pint = pfoo; // warning: assignment from incompatible pointer type 1268/// 1269/// As a result, the code for dealing with pointers is more complex than the 1270/// C99 spec dictates. 1271/// 1272Sema::AssignConvertType 1273Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1274 // Get canonical types. We're not formatting these types, just comparing 1275 // them. 1276 lhsType = lhsType.getCanonicalType().getUnqualifiedType(); 1277 rhsType = rhsType.getCanonicalType().getUnqualifiedType(); 1278 1279 if (lhsType == rhsType) 1280 return Compatible; // Common case: fast path an exact match. 1281 1282 if (lhsType->isReferenceType() || rhsType->isReferenceType()) { 1283 if (Context.typesAreCompatible(lhsType, rhsType)) 1284 return Compatible; 1285 return Incompatible; 1286 } 1287 1288 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1289 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1290 return Compatible; 1291 return Incompatible; 1292 } 1293 1294 if (isa<VectorType>(lhsType) || isa<VectorType>(rhsType)) { 1295 // For ExtVector, allow vector splats; float -> <n x float> 1296 if (const ExtVectorType *LV = dyn_cast<ExtVectorType>(lhsType)) { 1297 if (LV->getElementType().getTypePtr() == rhsType.getTypePtr()) 1298 return Compatible; 1299 } 1300 1301 // If LHS and RHS are both vectors of integer or both vectors of floating 1302 // point types, and the total vector length is the same, allow the 1303 // conversion. This is a bitcast; no bits are changed but the result type 1304 // is different. 1305 if (getLangOptions().LaxVectorConversions && 1306 lhsType->isVectorType() && rhsType->isVectorType()) { 1307 if ((lhsType->isIntegerType() && rhsType->isIntegerType()) || 1308 (lhsType->isRealFloatingType() && rhsType->isRealFloatingType())) { 1309 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1310 return Compatible; 1311 } 1312 } 1313 return Incompatible; 1314 } 1315 1316 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1317 return Compatible; 1318 1319 if (isa<PointerType>(lhsType)) { 1320 if (rhsType->isIntegerType()) 1321 return IntToPointer; 1322 1323 if (isa<PointerType>(rhsType)) 1324 return CheckPointerTypesForAssignment(lhsType, rhsType); 1325 return Incompatible; 1326 } 1327 1328 if (isa<PointerType>(rhsType)) { 1329 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1330 if (lhsType == Context.BoolTy) 1331 return Compatible; 1332 1333 if (lhsType->isIntegerType()) 1334 return PointerToInt; 1335 1336 if (isa<PointerType>(lhsType)) 1337 return CheckPointerTypesForAssignment(lhsType, rhsType); 1338 return Incompatible; 1339 } 1340 1341 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1342 if (Context.typesAreCompatible(lhsType, rhsType)) 1343 return Compatible; 1344 } 1345 return Incompatible; 1346} 1347 1348Sema::AssignConvertType 1349Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1350 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1351 // a null pointer constant. 1352 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType()) 1353 && rExpr->isNullPointerConstant(Context)) { 1354 ImpCastExprToType(rExpr, lhsType); 1355 return Compatible; 1356 } 1357 // This check seems unnatural, however it is necessary to ensure the proper 1358 // conversion of functions/arrays. If the conversion were done for all 1359 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1360 // expressions that surpress this implicit conversion (&, sizeof). 1361 // 1362 // Suppress this for references: C99 8.5.3p5. FIXME: revisit when references 1363 // are better understood. 1364 if (!lhsType->isReferenceType()) 1365 DefaultFunctionArrayConversion(rExpr); 1366 1367 Sema::AssignConvertType result = 1368 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1369 1370 // C99 6.5.16.1p2: The value of the right operand is converted to the 1371 // type of the assignment expression. 1372 if (rExpr->getType() != lhsType) 1373 ImpCastExprToType(rExpr, lhsType); 1374 return result; 1375} 1376 1377Sema::AssignConvertType 1378Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1379 return CheckAssignmentConstraints(lhsType, rhsType); 1380} 1381 1382QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1383 Diag(loc, diag::err_typecheck_invalid_operands, 1384 lex->getType().getAsString(), rex->getType().getAsString(), 1385 lex->getSourceRange(), rex->getSourceRange()); 1386 return QualType(); 1387} 1388 1389inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1390 Expr *&rex) { 1391 // For conversion purposes, we ignore any qualifiers. 1392 // For example, "const float" and "float" are equivalent. 1393 QualType lhsType = lex->getType().getCanonicalType().getUnqualifiedType(); 1394 QualType rhsType = rex->getType().getCanonicalType().getUnqualifiedType(); 1395 1396 // make sure the vector types are identical. 1397 if (lhsType == rhsType) 1398 return lhsType; 1399 1400 // if the lhs is an extended vector and the rhs is a scalar of the same type, 1401 // promote the rhs to the vector type. 1402 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1403 if (V->getElementType().getCanonicalType().getTypePtr() 1404 == rhsType.getCanonicalType().getTypePtr()) { 1405 ImpCastExprToType(rex, lhsType); 1406 return lhsType; 1407 } 1408 } 1409 1410 // if the rhs is an extended vector and the lhs is a scalar of the same type, 1411 // promote the lhs to the vector type. 1412 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1413 if (V->getElementType().getCanonicalType().getTypePtr() 1414 == lhsType.getCanonicalType().getTypePtr()) { 1415 ImpCastExprToType(lex, rhsType); 1416 return rhsType; 1417 } 1418 } 1419 1420 // You cannot convert between vector values of different size. 1421 Diag(loc, diag::err_typecheck_vector_not_convertable, 1422 lex->getType().getAsString(), rex->getType().getAsString(), 1423 lex->getSourceRange(), rex->getSourceRange()); 1424 return QualType(); 1425} 1426 1427inline QualType Sema::CheckMultiplyDivideOperands( 1428 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1429{ 1430 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1431 1432 if (lhsType->isVectorType() || rhsType->isVectorType()) 1433 return CheckVectorOperands(loc, lex, rex); 1434 1435 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1436 1437 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1438 return compType; 1439 return InvalidOperands(loc, lex, rex); 1440} 1441 1442inline QualType Sema::CheckRemainderOperands( 1443 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1444{ 1445 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1446 1447 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1448 1449 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1450 return compType; 1451 return InvalidOperands(loc, lex, rex); 1452} 1453 1454inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1455 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1456{ 1457 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1458 return CheckVectorOperands(loc, lex, rex); 1459 1460 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1461 1462 // handle the common case first (both operands are arithmetic). 1463 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1464 return compType; 1465 1466 // Put any potential pointer into PExp 1467 Expr* PExp = lex, *IExp = rex; 1468 if (IExp->getType()->isPointerType()) 1469 std::swap(PExp, IExp); 1470 1471 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1472 if (IExp->getType()->isIntegerType()) { 1473 // Check for arithmetic on pointers to incomplete types 1474 if (!PTy->getPointeeType()->isObjectType()) { 1475 if (PTy->getPointeeType()->isVoidType()) { 1476 Diag(loc, diag::ext_gnu_void_ptr, 1477 lex->getSourceRange(), rex->getSourceRange()); 1478 } else { 1479 Diag(loc, diag::err_typecheck_arithmetic_incomplete_type, 1480 lex->getType().getAsString(), lex->getSourceRange()); 1481 return QualType(); 1482 } 1483 } 1484 return PExp->getType(); 1485 } 1486 } 1487 1488 return InvalidOperands(loc, lex, rex); 1489} 1490 1491// C99 6.5.6 1492QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1493 SourceLocation loc, bool isCompAssign) { 1494 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1495 return CheckVectorOperands(loc, lex, rex); 1496 1497 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1498 1499 // Enforce type constraints: C99 6.5.6p3. 1500 1501 // Handle the common case first (both operands are arithmetic). 1502 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1503 return compType; 1504 1505 // Either ptr - int or ptr - ptr. 1506 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1507 QualType lpointee = LHSPTy->getPointeeType(); 1508 1509 // The LHS must be an object type, not incomplete, function, etc. 1510 if (!lpointee->isObjectType()) { 1511 // Handle the GNU void* extension. 1512 if (lpointee->isVoidType()) { 1513 Diag(loc, diag::ext_gnu_void_ptr, 1514 lex->getSourceRange(), rex->getSourceRange()); 1515 } else { 1516 Diag(loc, diag::err_typecheck_sub_ptr_object, 1517 lex->getType().getAsString(), lex->getSourceRange()); 1518 return QualType(); 1519 } 1520 } 1521 1522 // The result type of a pointer-int computation is the pointer type. 1523 if (rex->getType()->isIntegerType()) 1524 return lex->getType(); 1525 1526 // Handle pointer-pointer subtractions. 1527 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 1528 QualType rpointee = RHSPTy->getPointeeType(); 1529 1530 // RHS must be an object type, unless void (GNU). 1531 if (!rpointee->isObjectType()) { 1532 // Handle the GNU void* extension. 1533 if (rpointee->isVoidType()) { 1534 if (!lpointee->isVoidType()) 1535 Diag(loc, diag::ext_gnu_void_ptr, 1536 lex->getSourceRange(), rex->getSourceRange()); 1537 } else { 1538 Diag(loc, diag::err_typecheck_sub_ptr_object, 1539 rex->getType().getAsString(), rex->getSourceRange()); 1540 return QualType(); 1541 } 1542 } 1543 1544 // Pointee types must be compatible. 1545 if (!Context.typesAreCompatible(lpointee.getUnqualifiedType(), 1546 rpointee.getUnqualifiedType())) { 1547 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 1548 lex->getType().getAsString(), rex->getType().getAsString(), 1549 lex->getSourceRange(), rex->getSourceRange()); 1550 return QualType(); 1551 } 1552 1553 return Context.getPointerDiffType(); 1554 } 1555 } 1556 1557 return InvalidOperands(loc, lex, rex); 1558} 1559 1560// C99 6.5.7 1561QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1562 bool isCompAssign) { 1563 // C99 6.5.7p2: Each of the operands shall have integer type. 1564 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 1565 return InvalidOperands(loc, lex, rex); 1566 1567 // Shifts don't perform usual arithmetic conversions, they just do integer 1568 // promotions on each operand. C99 6.5.7p3 1569 if (!isCompAssign) 1570 UsualUnaryConversions(lex); 1571 UsualUnaryConversions(rex); 1572 1573 // "The type of the result is that of the promoted left operand." 1574 return lex->getType(); 1575} 1576 1577// C99 6.5.8 1578QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1579 bool isRelational) { 1580 // C99 6.5.8p3 / C99 6.5.9p4 1581 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1582 UsualArithmeticConversions(lex, rex); 1583 else { 1584 UsualUnaryConversions(lex); 1585 UsualUnaryConversions(rex); 1586 } 1587 QualType lType = lex->getType(); 1588 QualType rType = rex->getType(); 1589 1590 // For non-floating point types, check for self-comparisons of the form 1591 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 1592 // often indicate logic errors in the program. 1593 if (!lType->isFloatingType()) { 1594 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 1595 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 1596 if (DRL->getDecl() == DRR->getDecl()) 1597 Diag(loc, diag::warn_selfcomparison); 1598 } 1599 1600 if (isRelational) { 1601 if (lType->isRealType() && rType->isRealType()) 1602 return Context.IntTy; 1603 } else { 1604 // Check for comparisons of floating point operands using != and ==. 1605 if (lType->isFloatingType()) { 1606 assert (rType->isFloatingType()); 1607 CheckFloatComparison(loc,lex,rex); 1608 } 1609 1610 if (lType->isArithmeticType() && rType->isArithmeticType()) 1611 return Context.IntTy; 1612 } 1613 1614 bool LHSIsNull = lex->isNullPointerConstant(Context); 1615 bool RHSIsNull = rex->isNullPointerConstant(Context); 1616 1617 // All of the following pointer related warnings are GCC extensions, except 1618 // when handling null pointer constants. One day, we can consider making them 1619 // errors (when -pedantic-errors is enabled). 1620 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 1621 QualType LCanPointeeTy = 1622 lType->getAsPointerType()->getPointeeType().getCanonicalType(); 1623 QualType RCanPointeeTy = 1624 rType->getAsPointerType()->getPointeeType().getCanonicalType(); 1625 1626 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 1627 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 1628 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 1629 RCanPointeeTy.getUnqualifiedType())) { 1630 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 1631 lType.getAsString(), rType.getAsString(), 1632 lex->getSourceRange(), rex->getSourceRange()); 1633 } 1634 ImpCastExprToType(rex, lType); // promote the pointer to pointer 1635 return Context.IntTy; 1636 } 1637 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType()) 1638 && ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 1639 ImpCastExprToType(rex, lType); 1640 return Context.IntTy; 1641 } 1642 if (lType->isPointerType() && rType->isIntegerType()) { 1643 if (!RHSIsNull) 1644 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 1645 lType.getAsString(), rType.getAsString(), 1646 lex->getSourceRange(), rex->getSourceRange()); 1647 ImpCastExprToType(rex, lType); // promote the integer to pointer 1648 return Context.IntTy; 1649 } 1650 if (lType->isIntegerType() && rType->isPointerType()) { 1651 if (!LHSIsNull) 1652 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 1653 lType.getAsString(), rType.getAsString(), 1654 lex->getSourceRange(), rex->getSourceRange()); 1655 ImpCastExprToType(lex, rType); // promote the integer to pointer 1656 return Context.IntTy; 1657 } 1658 return InvalidOperands(loc, lex, rex); 1659} 1660 1661inline QualType Sema::CheckBitwiseOperands( 1662 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1663{ 1664 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1665 return CheckVectorOperands(loc, lex, rex); 1666 1667 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1668 1669 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1670 return compType; 1671 return InvalidOperands(loc, lex, rex); 1672} 1673 1674inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 1675 Expr *&lex, Expr *&rex, SourceLocation loc) 1676{ 1677 UsualUnaryConversions(lex); 1678 UsualUnaryConversions(rex); 1679 1680 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 1681 return Context.IntTy; 1682 return InvalidOperands(loc, lex, rex); 1683} 1684 1685inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 1686 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 1687{ 1688 QualType lhsType = lex->getType(); 1689 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 1690 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(); 1691 1692 switch (mlval) { // C99 6.5.16p2 1693 case Expr::MLV_Valid: 1694 break; 1695 case Expr::MLV_ConstQualified: 1696 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 1697 return QualType(); 1698 case Expr::MLV_ArrayType: 1699 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 1700 lhsType.getAsString(), lex->getSourceRange()); 1701 return QualType(); 1702 case Expr::MLV_NotObjectType: 1703 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 1704 lhsType.getAsString(), lex->getSourceRange()); 1705 return QualType(); 1706 case Expr::MLV_InvalidExpression: 1707 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 1708 lex->getSourceRange()); 1709 return QualType(); 1710 case Expr::MLV_IncompleteType: 1711 case Expr::MLV_IncompleteVoidType: 1712 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 1713 lhsType.getAsString(), lex->getSourceRange()); 1714 return QualType(); 1715 case Expr::MLV_DuplicateVectorComponents: 1716 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 1717 lex->getSourceRange()); 1718 return QualType(); 1719 } 1720 1721 AssignConvertType ConvTy; 1722 if (compoundType.isNull()) 1723 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 1724 else 1725 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 1726 1727 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 1728 rex, "assigning")) 1729 return QualType(); 1730 1731 // C99 6.5.16p3: The type of an assignment expression is the type of the 1732 // left operand unless the left operand has qualified type, in which case 1733 // it is the unqualified version of the type of the left operand. 1734 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 1735 // is converted to the type of the assignment expression (above). 1736 // C++ 5.17p1: the type of the assignment expression is that of its left 1737 // oprdu. 1738 return lhsType.getUnqualifiedType(); 1739} 1740 1741inline QualType Sema::CheckCommaOperands( // C99 6.5.17 1742 Expr *&lex, Expr *&rex, SourceLocation loc) { 1743 UsualUnaryConversions(rex); 1744 return rex->getType(); 1745} 1746 1747/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 1748/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 1749QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 1750 QualType resType = op->getType(); 1751 assert(!resType.isNull() && "no type for increment/decrement expression"); 1752 1753 // C99 6.5.2.4p1: We allow complex as a GCC extension. 1754 if (const PointerType *pt = resType->getAsPointerType()) { 1755 if (pt->getPointeeType()->isVoidType()) { 1756 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 1757 } else if (!pt->getPointeeType()->isObjectType()) { 1758 // C99 6.5.2.4p2, 6.5.6p2 1759 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 1760 resType.getAsString(), op->getSourceRange()); 1761 return QualType(); 1762 } 1763 } else if (!resType->isRealType()) { 1764 if (resType->isComplexType()) 1765 // C99 does not support ++/-- on complex types. 1766 Diag(OpLoc, diag::ext_integer_increment_complex, 1767 resType.getAsString(), op->getSourceRange()); 1768 else { 1769 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 1770 resType.getAsString(), op->getSourceRange()); 1771 return QualType(); 1772 } 1773 } 1774 // At this point, we know we have a real, complex or pointer type. 1775 // Now make sure the operand is a modifiable lvalue. 1776 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(); 1777 if (mlval != Expr::MLV_Valid) { 1778 // FIXME: emit a more precise diagnostic... 1779 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 1780 op->getSourceRange()); 1781 return QualType(); 1782 } 1783 return resType; 1784} 1785 1786/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 1787/// This routine allows us to typecheck complex/recursive expressions 1788/// where the declaration is needed for type checking. Here are some 1789/// examples: &s.xx, &s.zz[1].yy, &(1+2), &(XX), &"123"[2]. 1790static ValueDecl *getPrimaryDecl(Expr *E) { 1791 switch (E->getStmtClass()) { 1792 case Stmt::DeclRefExprClass: 1793 return cast<DeclRefExpr>(E)->getDecl(); 1794 case Stmt::MemberExprClass: 1795 // Fields cannot be declared with a 'register' storage class. 1796 // &X->f is always ok, even if X is declared register. 1797 if (cast<MemberExpr>(E)->isArrow()) 1798 return 0; 1799 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 1800 case Stmt::ArraySubscriptExprClass: { 1801 // &X[4] and &4[X] is invalid if X is invalid and X is not a pointer. 1802 1803 ValueDecl *VD = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 1804 if (!VD || VD->getType()->isPointerType()) 1805 return 0; 1806 else 1807 return VD; 1808 } 1809 case Stmt::UnaryOperatorClass: 1810 return getPrimaryDecl(cast<UnaryOperator>(E)->getSubExpr()); 1811 case Stmt::ParenExprClass: 1812 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 1813 case Stmt::ImplicitCastExprClass: 1814 // &X[4] when X is an array, has an implicit cast from array to pointer. 1815 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 1816 default: 1817 return 0; 1818 } 1819} 1820 1821/// CheckAddressOfOperand - The operand of & must be either a function 1822/// designator or an lvalue designating an object. If it is an lvalue, the 1823/// object cannot be declared with storage class register or be a bit field. 1824/// Note: The usual conversions are *not* applied to the operand of the & 1825/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 1826QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 1827 if (getLangOptions().C99) { 1828 // Implement C99-only parts of addressof rules. 1829 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 1830 if (uOp->getOpcode() == UnaryOperator::Deref) 1831 // Per C99 6.5.3.2, the address of a deref always returns a valid result 1832 // (assuming the deref expression is valid). 1833 return uOp->getSubExpr()->getType(); 1834 } 1835 // Technically, there should be a check for array subscript 1836 // expressions here, but the result of one is always an lvalue anyway. 1837 } 1838 ValueDecl *dcl = getPrimaryDecl(op); 1839 Expr::isLvalueResult lval = op->isLvalue(); 1840 1841 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 1842 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 1843 // FIXME: emit more specific diag... 1844 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 1845 op->getSourceRange()); 1846 return QualType(); 1847 } 1848 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 1849 if (MemExpr->getMemberDecl()->isBitField()) { 1850 Diag(OpLoc, diag::err_typecheck_address_of, 1851 std::string("bit-field"), op->getSourceRange()); 1852 return QualType(); 1853 } 1854 // Check for Apple extension for accessing vector components. 1855 } else if (isa<ArraySubscriptExpr>(op) && 1856 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 1857 Diag(OpLoc, diag::err_typecheck_address_of, 1858 std::string("vector"), op->getSourceRange()); 1859 return QualType(); 1860 } else if (dcl) { // C99 6.5.3.2p1 1861 // We have an lvalue with a decl. Make sure the decl is not declared 1862 // with the register storage-class specifier. 1863 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 1864 if (vd->getStorageClass() == VarDecl::Register) { 1865 Diag(OpLoc, diag::err_typecheck_address_of, 1866 std::string("register variable"), op->getSourceRange()); 1867 return QualType(); 1868 } 1869 } else 1870 assert(0 && "Unknown/unexpected decl type"); 1871 } 1872 // If the operand has type "type", the result has type "pointer to type". 1873 return Context.getPointerType(op->getType()); 1874} 1875 1876QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 1877 UsualUnaryConversions(op); 1878 QualType qType = op->getType(); 1879 1880 if (const PointerType *PT = qType->getAsPointerType()) { 1881 // Note that per both C89 and C99, this is always legal, even 1882 // if ptype is an incomplete type or void. 1883 // It would be possible to warn about dereferencing a 1884 // void pointer, but it's completely well-defined, 1885 // and such a warning is unlikely to catch any mistakes. 1886 return PT->getPointeeType(); 1887 } 1888 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 1889 qType.getAsString(), op->getSourceRange()); 1890 return QualType(); 1891} 1892 1893static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 1894 tok::TokenKind Kind) { 1895 BinaryOperator::Opcode Opc; 1896 switch (Kind) { 1897 default: assert(0 && "Unknown binop!"); 1898 case tok::star: Opc = BinaryOperator::Mul; break; 1899 case tok::slash: Opc = BinaryOperator::Div; break; 1900 case tok::percent: Opc = BinaryOperator::Rem; break; 1901 case tok::plus: Opc = BinaryOperator::Add; break; 1902 case tok::minus: Opc = BinaryOperator::Sub; break; 1903 case tok::lessless: Opc = BinaryOperator::Shl; break; 1904 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 1905 case tok::lessequal: Opc = BinaryOperator::LE; break; 1906 case tok::less: Opc = BinaryOperator::LT; break; 1907 case tok::greaterequal: Opc = BinaryOperator::GE; break; 1908 case tok::greater: Opc = BinaryOperator::GT; break; 1909 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 1910 case tok::equalequal: Opc = BinaryOperator::EQ; break; 1911 case tok::amp: Opc = BinaryOperator::And; break; 1912 case tok::caret: Opc = BinaryOperator::Xor; break; 1913 case tok::pipe: Opc = BinaryOperator::Or; break; 1914 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 1915 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 1916 case tok::equal: Opc = BinaryOperator::Assign; break; 1917 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 1918 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 1919 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 1920 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 1921 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 1922 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 1923 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 1924 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 1925 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 1926 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 1927 case tok::comma: Opc = BinaryOperator::Comma; break; 1928 } 1929 return Opc; 1930} 1931 1932static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 1933 tok::TokenKind Kind) { 1934 UnaryOperator::Opcode Opc; 1935 switch (Kind) { 1936 default: assert(0 && "Unknown unary op!"); 1937 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 1938 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 1939 case tok::amp: Opc = UnaryOperator::AddrOf; break; 1940 case tok::star: Opc = UnaryOperator::Deref; break; 1941 case tok::plus: Opc = UnaryOperator::Plus; break; 1942 case tok::minus: Opc = UnaryOperator::Minus; break; 1943 case tok::tilde: Opc = UnaryOperator::Not; break; 1944 case tok::exclaim: Opc = UnaryOperator::LNot; break; 1945 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 1946 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 1947 case tok::kw___real: Opc = UnaryOperator::Real; break; 1948 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 1949 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 1950 } 1951 return Opc; 1952} 1953 1954// Binary Operators. 'Tok' is the token for the operator. 1955Action::ExprResult Sema::ActOnBinOp(SourceLocation TokLoc, tok::TokenKind Kind, 1956 ExprTy *LHS, ExprTy *RHS) { 1957 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 1958 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 1959 1960 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 1961 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 1962 1963 QualType ResultTy; // Result type of the binary operator. 1964 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 1965 1966 switch (Opc) { 1967 default: 1968 assert(0 && "Unknown binary expr!"); 1969 case BinaryOperator::Assign: 1970 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, QualType()); 1971 break; 1972 case BinaryOperator::Mul: 1973 case BinaryOperator::Div: 1974 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc); 1975 break; 1976 case BinaryOperator::Rem: 1977 ResultTy = CheckRemainderOperands(lhs, rhs, TokLoc); 1978 break; 1979 case BinaryOperator::Add: 1980 ResultTy = CheckAdditionOperands(lhs, rhs, TokLoc); 1981 break; 1982 case BinaryOperator::Sub: 1983 ResultTy = CheckSubtractionOperands(lhs, rhs, TokLoc); 1984 break; 1985 case BinaryOperator::Shl: 1986 case BinaryOperator::Shr: 1987 ResultTy = CheckShiftOperands(lhs, rhs, TokLoc); 1988 break; 1989 case BinaryOperator::LE: 1990 case BinaryOperator::LT: 1991 case BinaryOperator::GE: 1992 case BinaryOperator::GT: 1993 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, true); 1994 break; 1995 case BinaryOperator::EQ: 1996 case BinaryOperator::NE: 1997 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, false); 1998 break; 1999 case BinaryOperator::And: 2000 case BinaryOperator::Xor: 2001 case BinaryOperator::Or: 2002 ResultTy = CheckBitwiseOperands(lhs, rhs, TokLoc); 2003 break; 2004 case BinaryOperator::LAnd: 2005 case BinaryOperator::LOr: 2006 ResultTy = CheckLogicalOperands(lhs, rhs, TokLoc); 2007 break; 2008 case BinaryOperator::MulAssign: 2009 case BinaryOperator::DivAssign: 2010 CompTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc, true); 2011 if (!CompTy.isNull()) 2012 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2013 break; 2014 case BinaryOperator::RemAssign: 2015 CompTy = CheckRemainderOperands(lhs, rhs, TokLoc, true); 2016 if (!CompTy.isNull()) 2017 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2018 break; 2019 case BinaryOperator::AddAssign: 2020 CompTy = CheckAdditionOperands(lhs, rhs, TokLoc, true); 2021 if (!CompTy.isNull()) 2022 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2023 break; 2024 case BinaryOperator::SubAssign: 2025 CompTy = CheckSubtractionOperands(lhs, rhs, TokLoc, true); 2026 if (!CompTy.isNull()) 2027 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2028 break; 2029 case BinaryOperator::ShlAssign: 2030 case BinaryOperator::ShrAssign: 2031 CompTy = CheckShiftOperands(lhs, rhs, TokLoc, true); 2032 if (!CompTy.isNull()) 2033 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2034 break; 2035 case BinaryOperator::AndAssign: 2036 case BinaryOperator::XorAssign: 2037 case BinaryOperator::OrAssign: 2038 CompTy = CheckBitwiseOperands(lhs, rhs, TokLoc, true); 2039 if (!CompTy.isNull()) 2040 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2041 break; 2042 case BinaryOperator::Comma: 2043 ResultTy = CheckCommaOperands(lhs, rhs, TokLoc); 2044 break; 2045 } 2046 if (ResultTy.isNull()) 2047 return true; 2048 if (CompTy.isNull()) 2049 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 2050 else 2051 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, TokLoc); 2052} 2053 2054// Unary Operators. 'Tok' is the token for the operator. 2055Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2056 ExprTy *input) { 2057 Expr *Input = (Expr*)input; 2058 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2059 QualType resultType; 2060 switch (Opc) { 2061 default: 2062 assert(0 && "Unimplemented unary expr!"); 2063 case UnaryOperator::PreInc: 2064 case UnaryOperator::PreDec: 2065 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2066 break; 2067 case UnaryOperator::AddrOf: 2068 resultType = CheckAddressOfOperand(Input, OpLoc); 2069 break; 2070 case UnaryOperator::Deref: 2071 DefaultFunctionArrayConversion(Input); 2072 resultType = CheckIndirectionOperand(Input, OpLoc); 2073 break; 2074 case UnaryOperator::Plus: 2075 case UnaryOperator::Minus: 2076 UsualUnaryConversions(Input); 2077 resultType = Input->getType(); 2078 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2079 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2080 resultType.getAsString()); 2081 break; 2082 case UnaryOperator::Not: // bitwise complement 2083 UsualUnaryConversions(Input); 2084 resultType = Input->getType(); 2085 // C99 6.5.3.3p1. We allow complex as a GCC extension. 2086 if (!resultType->isIntegerType()) { 2087 if (resultType->isComplexType()) 2088 // C99 does not support '~' for complex conjugation. 2089 Diag(OpLoc, diag::ext_integer_complement_complex, 2090 resultType.getAsString()); 2091 else 2092 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2093 resultType.getAsString()); 2094 } 2095 break; 2096 case UnaryOperator::LNot: // logical negation 2097 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2098 DefaultFunctionArrayConversion(Input); 2099 resultType = Input->getType(); 2100 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2101 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2102 resultType.getAsString()); 2103 // LNot always has type int. C99 6.5.3.3p5. 2104 resultType = Context.IntTy; 2105 break; 2106 case UnaryOperator::SizeOf: 2107 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, true); 2108 break; 2109 case UnaryOperator::AlignOf: 2110 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, false); 2111 break; 2112 case UnaryOperator::Real: 2113 case UnaryOperator::Imag: 2114 resultType = CheckRealImagOperand(Input, OpLoc); 2115 break; 2116 case UnaryOperator::Extension: 2117 resultType = Input->getType(); 2118 break; 2119 } 2120 if (resultType.isNull()) 2121 return true; 2122 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2123} 2124 2125/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2126Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2127 SourceLocation LabLoc, 2128 IdentifierInfo *LabelII) { 2129 // Look up the record for this label identifier. 2130 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2131 2132 // If we haven't seen this label yet, create a forward reference. 2133 if (LabelDecl == 0) 2134 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2135 2136 // Create the AST node. The address of a label always has type 'void*'. 2137 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2138 Context.getPointerType(Context.VoidTy)); 2139} 2140 2141Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2142 SourceLocation RPLoc) { // "({..})" 2143 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2144 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2145 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2146 2147 // FIXME: there are a variety of strange constraints to enforce here, for 2148 // example, it is not possible to goto into a stmt expression apparently. 2149 // More semantic analysis is needed. 2150 2151 // FIXME: the last statement in the compount stmt has its value used. We 2152 // should not warn about it being unused. 2153 2154 // If there are sub stmts in the compound stmt, take the type of the last one 2155 // as the type of the stmtexpr. 2156 QualType Ty = Context.VoidTy; 2157 2158 if (!Compound->body_empty()) 2159 if (Expr *LastExpr = dyn_cast<Expr>(Compound->body_back())) 2160 Ty = LastExpr->getType(); 2161 2162 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2163} 2164 2165Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2166 SourceLocation TypeLoc, 2167 TypeTy *argty, 2168 OffsetOfComponent *CompPtr, 2169 unsigned NumComponents, 2170 SourceLocation RPLoc) { 2171 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2172 assert(!ArgTy.isNull() && "Missing type argument!"); 2173 2174 // We must have at least one component that refers to the type, and the first 2175 // one is known to be a field designator. Verify that the ArgTy represents 2176 // a struct/union/class. 2177 if (!ArgTy->isRecordType()) 2178 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2179 2180 // Otherwise, create a compound literal expression as the base, and 2181 // iteratively process the offsetof designators. 2182 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2183 2184 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2185 // GCC extension, diagnose them. 2186 if (NumComponents != 1) 2187 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2188 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2189 2190 for (unsigned i = 0; i != NumComponents; ++i) { 2191 const OffsetOfComponent &OC = CompPtr[i]; 2192 if (OC.isBrackets) { 2193 // Offset of an array sub-field. TODO: Should we allow vector elements? 2194 const ArrayType *AT = Res->getType()->getAsArrayType(); 2195 if (!AT) { 2196 delete Res; 2197 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 2198 Res->getType().getAsString()); 2199 } 2200 2201 // FIXME: C++: Verify that operator[] isn't overloaded. 2202 2203 // C99 6.5.2.1p1 2204 Expr *Idx = static_cast<Expr*>(OC.U.E); 2205 if (!Idx->getType()->isIntegerType()) 2206 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 2207 Idx->getSourceRange()); 2208 2209 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 2210 continue; 2211 } 2212 2213 const RecordType *RC = Res->getType()->getAsRecordType(); 2214 if (!RC) { 2215 delete Res; 2216 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 2217 Res->getType().getAsString()); 2218 } 2219 2220 // Get the decl corresponding to this. 2221 RecordDecl *RD = RC->getDecl(); 2222 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 2223 if (!MemberDecl) 2224 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 2225 OC.U.IdentInfo->getName(), 2226 SourceRange(OC.LocStart, OC.LocEnd)); 2227 2228 // FIXME: C++: Verify that MemberDecl isn't a static field. 2229 // FIXME: Verify that MemberDecl isn't a bitfield. 2230 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 2231 // matter here. 2232 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, MemberDecl->getType()); 2233 } 2234 2235 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 2236 BuiltinLoc); 2237} 2238 2239 2240Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 2241 TypeTy *arg1, TypeTy *arg2, 2242 SourceLocation RPLoc) { 2243 QualType argT1 = QualType::getFromOpaquePtr(arg1); 2244 QualType argT2 = QualType::getFromOpaquePtr(arg2); 2245 2246 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 2247 2248 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 2249} 2250 2251Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 2252 ExprTy *expr1, ExprTy *expr2, 2253 SourceLocation RPLoc) { 2254 Expr *CondExpr = static_cast<Expr*>(cond); 2255 Expr *LHSExpr = static_cast<Expr*>(expr1); 2256 Expr *RHSExpr = static_cast<Expr*>(expr2); 2257 2258 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 2259 2260 // The conditional expression is required to be a constant expression. 2261 llvm::APSInt condEval(32); 2262 SourceLocation ExpLoc; 2263 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 2264 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 2265 CondExpr->getSourceRange()); 2266 2267 // If the condition is > zero, then the AST type is the same as the LSHExpr. 2268 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 2269 RHSExpr->getType(); 2270 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 2271} 2272 2273/// ExprsMatchFnType - return true if the Exprs in array Args have 2274/// QualTypes that match the QualTypes of the arguments of the FnType. 2275/// The number of arguments has already been validated to match the number of 2276/// arguments in FnType. 2277static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType) { 2278 unsigned NumParams = FnType->getNumArgs(); 2279 for (unsigned i = 0; i != NumParams; ++i) { 2280 QualType ExprTy = Args[i]->getType().getCanonicalType(); 2281 QualType ParmTy = FnType->getArgType(i).getCanonicalType(); 2282 2283 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 2284 return false; 2285 } 2286 return true; 2287} 2288 2289Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 2290 SourceLocation *CommaLocs, 2291 SourceLocation BuiltinLoc, 2292 SourceLocation RParenLoc) { 2293 // __builtin_overload requires at least 2 arguments 2294 if (NumArgs < 2) 2295 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2296 SourceRange(BuiltinLoc, RParenLoc)); 2297 2298 // The first argument is required to be a constant expression. It tells us 2299 // the number of arguments to pass to each of the functions to be overloaded. 2300 Expr **Args = reinterpret_cast<Expr**>(args); 2301 Expr *NParamsExpr = Args[0]; 2302 llvm::APSInt constEval(32); 2303 SourceLocation ExpLoc; 2304 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 2305 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2306 NParamsExpr->getSourceRange()); 2307 2308 // Verify that the number of parameters is > 0 2309 unsigned NumParams = constEval.getZExtValue(); 2310 if (NumParams == 0) 2311 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2312 NParamsExpr->getSourceRange()); 2313 // Verify that we have at least 1 + NumParams arguments to the builtin. 2314 if ((NumParams + 1) > NumArgs) 2315 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2316 SourceRange(BuiltinLoc, RParenLoc)); 2317 2318 // Figure out the return type, by matching the args to one of the functions 2319 // listed after the parameters. 2320 OverloadExpr *OE = 0; 2321 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 2322 // UsualUnaryConversions will convert the function DeclRefExpr into a 2323 // pointer to function. 2324 Expr *Fn = UsualUnaryConversions(Args[i]); 2325 FunctionTypeProto *FnType = 0; 2326 if (const PointerType *PT = Fn->getType()->getAsPointerType()) { 2327 QualType PointeeType = PT->getPointeeType().getCanonicalType(); 2328 FnType = dyn_cast<FunctionTypeProto>(PointeeType); 2329 } 2330 2331 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 2332 // parameters, and the number of parameters must match the value passed to 2333 // the builtin. 2334 if (!FnType || (FnType->getNumArgs() != NumParams)) 2335 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 2336 Fn->getSourceRange()); 2337 2338 // Scan the parameter list for the FunctionType, checking the QualType of 2339 // each parameter against the QualTypes of the arguments to the builtin. 2340 // If they match, return a new OverloadExpr. 2341 if (ExprsMatchFnType(Args+1, FnType)) { 2342 if (OE) 2343 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 2344 OE->getFn()->getSourceRange()); 2345 // Remember our match, and continue processing the remaining arguments 2346 // to catch any errors. 2347 OE = new OverloadExpr(Args, NumArgs, i, FnType->getResultType(), 2348 BuiltinLoc, RParenLoc); 2349 } 2350 } 2351 // Return the newly created OverloadExpr node, if we succeded in matching 2352 // exactly one of the candidate functions. 2353 if (OE) 2354 return OE; 2355 2356 // If we didn't find a matching function Expr in the __builtin_overload list 2357 // the return an error. 2358 std::string typeNames; 2359 for (unsigned i = 0; i != NumParams; ++i) { 2360 if (i != 0) typeNames += ", "; 2361 typeNames += Args[i+1]->getType().getAsString(); 2362 } 2363 2364 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 2365 SourceRange(BuiltinLoc, RParenLoc)); 2366} 2367 2368Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 2369 ExprTy *expr, TypeTy *type, 2370 SourceLocation RPLoc) { 2371 Expr *E = static_cast<Expr*>(expr); 2372 QualType T = QualType::getFromOpaquePtr(type); 2373 2374 InitBuiltinVaListType(); 2375 2376 if (CheckAssignmentConstraints(Context.getBuiltinVaListType(), E->getType()) 2377 != Compatible) 2378 return Diag(E->getLocStart(), 2379 diag::err_first_argument_to_va_arg_not_of_type_va_list, 2380 E->getType().getAsString(), 2381 E->getSourceRange()); 2382 2383 // FIXME: Warn if a non-POD type is passed in. 2384 2385 return new VAArgExpr(BuiltinLoc, E, T, RPLoc); 2386} 2387 2388bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 2389 SourceLocation Loc, 2390 QualType DstType, QualType SrcType, 2391 Expr *SrcExpr, const char *Flavor) { 2392 // Decode the result (notice that AST's are still created for extensions). 2393 bool isInvalid = false; 2394 unsigned DiagKind; 2395 switch (ConvTy) { 2396 default: assert(0 && "Unknown conversion type"); 2397 case Compatible: return false; 2398 case PointerToInt: 2399 DiagKind = diag::ext_typecheck_convert_pointer_int; 2400 break; 2401 case IntToPointer: 2402 DiagKind = diag::ext_typecheck_convert_int_pointer; 2403 break; 2404 case IncompatiblePointer: 2405 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 2406 break; 2407 case FunctionVoidPointer: 2408 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 2409 break; 2410 case CompatiblePointerDiscardsQualifiers: 2411 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 2412 break; 2413 case Incompatible: 2414 DiagKind = diag::err_typecheck_convert_incompatible; 2415 isInvalid = true; 2416 break; 2417 } 2418 2419 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 2420 SrcExpr->getSourceRange()); 2421 return isInvalid; 2422} 2423 2424 2425 2426