SemaExpr.cpp revision c8e51f89effc4003fc54aa4dc5a34127e793c7f4
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/Parse/DeclSpec.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Lex/LiteralSupport.h" 22#include "clang/Basic/SourceManager.h" 23#include "clang/Basic/TargetInfo.h" 24#include "llvm/ADT/OwningPtr.h" 25#include "llvm/ADT/SmallString.h" 26#include "llvm/ADT/StringExtras.h" 27using namespace clang; 28 29/// ActOnStringLiteral - The specified tokens were lexed as pasted string 30/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 31/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 32/// multiple tokens. However, the common case is that StringToks points to one 33/// string. 34/// 35Action::ExprResult 36Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 37 assert(NumStringToks && "Must have at least one string!"); 38 39 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 40 if (Literal.hadError) 41 return ExprResult(true); 42 43 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 44 for (unsigned i = 0; i != NumStringToks; ++i) 45 StringTokLocs.push_back(StringToks[i].getLocation()); 46 47 // Verify that pascal strings aren't too large. 48 if (Literal.Pascal && Literal.GetStringLength() > 256) 49 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long, 50 SourceRange(StringToks[0].getLocation(), 51 StringToks[NumStringToks-1].getLocation())); 52 53 QualType StrTy = Context.CharTy; 54 // FIXME: handle wchar_t 55 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 56 57 // Get an array type for the string, according to C99 6.4.5. This includes 58 // the nul terminator character as well as the string length for pascal 59 // strings. 60 StrTy = Context.getConstantArrayType(StrTy, 61 llvm::APInt(32, Literal.GetStringLength()+1), 62 ArrayType::Normal, 0); 63 64 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 65 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 66 Literal.AnyWide, StrTy, 67 StringToks[0].getLocation(), 68 StringToks[NumStringToks-1].getLocation()); 69} 70 71 72/// ActOnIdentifierExpr - The parser read an identifier in expression context, 73/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 74/// identifier is used in a function call context. 75Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 76 IdentifierInfo &II, 77 bool HasTrailingLParen) { 78 // Could be enum-constant, value decl, instance variable, etc. 79 Decl *D = LookupDecl(&II, Decl::IDNS_Ordinary, S); 80 81 // If this reference is in an Objective-C method, then ivar lookup happens as 82 // well. 83 if (CurMethodDecl) { 84 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 85 // There are two cases to handle here. 1) scoped lookup could have failed, 86 // in which case we should look for an ivar. 2) scoped lookup could have 87 // found a decl, but that decl is outside the current method (i.e. a global 88 // variable). In these two cases, we do a lookup for an ivar with this 89 // name, if the lookup suceeds, we replace it our current decl. 90 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 91 ObjCInterfaceDecl *IFace = CurMethodDecl->getClassInterface(), *DeclClass; 92 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&II, DeclClass)) { 93 // FIXME: This should use a new expr for a direct reference, don't turn 94 // this into Self->ivar, just return a BareIVarExpr or something. 95 IdentifierInfo &II = Context.Idents.get("self"); 96 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 97 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 98 static_cast<Expr*>(SelfExpr.Val), true, true); 99 } 100 } 101 } 102 103 if (D == 0) { 104 // Otherwise, this could be an implicitly declared function reference (legal 105 // in C90, extension in C99). 106 if (HasTrailingLParen && 107 !getLangOptions().CPlusPlus) // Not in C++. 108 D = ImplicitlyDefineFunction(Loc, II, S); 109 else { 110 // If this name wasn't predeclared and if this is not a function call, 111 // diagnose the problem. 112 return Diag(Loc, diag::err_undeclared_var_use, II.getName()); 113 } 114 } 115 116 if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 117 // check if referencing an identifier with __attribute__((deprecated)). 118 if (VD->getAttr<DeprecatedAttr>()) 119 Diag(Loc, diag::warn_deprecated, VD->getName()); 120 121 // Only create DeclRefExpr's for valid Decl's. 122 if (VD->isInvalidDecl()) 123 return true; 124 return new DeclRefExpr(VD, VD->getType(), Loc); 125 } 126 127 if (isa<TypedefDecl>(D)) 128 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 129 if (isa<ObjCInterfaceDecl>(D)) 130 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 131 if (isa<NamespaceDecl>(D)) 132 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 133 134 assert(0 && "Invalid decl"); 135 abort(); 136} 137 138Sema::ExprResult Sema::ActOnPreDefinedExpr(SourceLocation Loc, 139 tok::TokenKind Kind) { 140 PreDefinedExpr::IdentType IT; 141 142 switch (Kind) { 143 default: assert(0 && "Unknown simple primary expr!"); 144 case tok::kw___func__: IT = PreDefinedExpr::Func; break; // [C99 6.4.2.2] 145 case tok::kw___FUNCTION__: IT = PreDefinedExpr::Function; break; 146 case tok::kw___PRETTY_FUNCTION__: IT = PreDefinedExpr::PrettyFunction; break; 147 } 148 149 // Verify that this is in a function context. 150 if (CurFunctionDecl == 0 && CurMethodDecl == 0) 151 return Diag(Loc, diag::err_predef_outside_function); 152 153 // Pre-defined identifiers are of type char[x], where x is the length of the 154 // string. 155 unsigned Length; 156 if (CurFunctionDecl) 157 Length = CurFunctionDecl->getIdentifier()->getLength(); 158 else 159 Length = CurMethodDecl->getSynthesizedMethodSize(); 160 161 llvm::APInt LengthI(32, Length + 1); 162 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 163 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 164 return new PreDefinedExpr(Loc, ResTy, IT); 165} 166 167Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 168 llvm::SmallString<16> CharBuffer; 169 CharBuffer.resize(Tok.getLength()); 170 const char *ThisTokBegin = &CharBuffer[0]; 171 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 172 173 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 174 Tok.getLocation(), PP); 175 if (Literal.hadError()) 176 return ExprResult(true); 177 178 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 179 180 return new CharacterLiteral(Literal.getValue(), type, Tok.getLocation()); 181} 182 183Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 184 // fast path for a single digit (which is quite common). A single digit 185 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 186 if (Tok.getLength() == 1) { 187 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 188 189 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 190 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 191 Context.IntTy, 192 Tok.getLocation())); 193 } 194 llvm::SmallString<512> IntegerBuffer; 195 IntegerBuffer.resize(Tok.getLength()); 196 const char *ThisTokBegin = &IntegerBuffer[0]; 197 198 // Get the spelling of the token, which eliminates trigraphs, etc. 199 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 200 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 201 Tok.getLocation(), PP); 202 if (Literal.hadError) 203 return ExprResult(true); 204 205 Expr *Res; 206 207 if (Literal.isFloatingLiteral()) { 208 QualType Ty; 209 const llvm::fltSemantics *Format; 210 211 if (Literal.isFloat) { 212 Ty = Context.FloatTy; 213 Format = Context.Target.getFloatFormat(); 214 } else if (!Literal.isLong) { 215 Ty = Context.DoubleTy; 216 Format = Context.Target.getDoubleFormat(); 217 } else { 218 Ty = Context.LongDoubleTy; 219 Format = Context.Target.getLongDoubleFormat(); 220 } 221 222 // isExact will be set by GetFloatValue(). 223 bool isExact = false; 224 225 Res = new FloatingLiteral(Literal.GetFloatValue(*Format,&isExact), &isExact, 226 Ty, Tok.getLocation()); 227 228 } else if (!Literal.isIntegerLiteral()) { 229 return ExprResult(true); 230 } else { 231 QualType Ty; 232 233 // long long is a C99 feature. 234 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 235 Literal.isLongLong) 236 Diag(Tok.getLocation(), diag::ext_longlong); 237 238 // Get the value in the widest-possible width. 239 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 240 241 if (Literal.GetIntegerValue(ResultVal)) { 242 // If this value didn't fit into uintmax_t, warn and force to ull. 243 Diag(Tok.getLocation(), diag::warn_integer_too_large); 244 Ty = Context.UnsignedLongLongTy; 245 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 246 "long long is not intmax_t?"); 247 } else { 248 // If this value fits into a ULL, try to figure out what else it fits into 249 // according to the rules of C99 6.4.4.1p5. 250 251 // Octal, Hexadecimal, and integers with a U suffix are allowed to 252 // be an unsigned int. 253 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 254 255 // Check from smallest to largest, picking the smallest type we can. 256 unsigned Width = 0; 257 if (!Literal.isLong && !Literal.isLongLong) { 258 // Are int/unsigned possibilities? 259 unsigned IntSize = Context.Target.getIntWidth(); 260 261 // Does it fit in a unsigned int? 262 if (ResultVal.isIntN(IntSize)) { 263 // Does it fit in a signed int? 264 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 265 Ty = Context.IntTy; 266 else if (AllowUnsigned) 267 Ty = Context.UnsignedIntTy; 268 Width = IntSize; 269 } 270 } 271 272 // Are long/unsigned long possibilities? 273 if (Ty.isNull() && !Literal.isLongLong) { 274 unsigned LongSize = Context.Target.getLongWidth(); 275 276 // Does it fit in a unsigned long? 277 if (ResultVal.isIntN(LongSize)) { 278 // Does it fit in a signed long? 279 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 280 Ty = Context.LongTy; 281 else if (AllowUnsigned) 282 Ty = Context.UnsignedLongTy; 283 Width = LongSize; 284 } 285 } 286 287 // Finally, check long long if needed. 288 if (Ty.isNull()) { 289 unsigned LongLongSize = Context.Target.getLongLongWidth(); 290 291 // Does it fit in a unsigned long long? 292 if (ResultVal.isIntN(LongLongSize)) { 293 // Does it fit in a signed long long? 294 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 295 Ty = Context.LongLongTy; 296 else if (AllowUnsigned) 297 Ty = Context.UnsignedLongLongTy; 298 Width = LongLongSize; 299 } 300 } 301 302 // If we still couldn't decide a type, we probably have something that 303 // does not fit in a signed long long, but has no U suffix. 304 if (Ty.isNull()) { 305 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 306 Ty = Context.UnsignedLongLongTy; 307 Width = Context.Target.getLongLongWidth(); 308 } 309 310 if (ResultVal.getBitWidth() != Width) 311 ResultVal.trunc(Width); 312 } 313 314 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 315 } 316 317 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 318 if (Literal.isImaginary) 319 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 320 321 return Res; 322} 323 324Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 325 ExprTy *Val) { 326 Expr *E = (Expr *)Val; 327 assert((E != 0) && "ActOnParenExpr() missing expr"); 328 return new ParenExpr(L, R, E); 329} 330 331/// The UsualUnaryConversions() function is *not* called by this routine. 332/// See C99 6.3.2.1p[2-4] for more details. 333QualType Sema::CheckSizeOfAlignOfOperand(QualType exprType, 334 SourceLocation OpLoc, bool isSizeof) { 335 // C99 6.5.3.4p1: 336 if (isa<FunctionType>(exprType) && isSizeof) 337 // alignof(function) is allowed. 338 Diag(OpLoc, diag::ext_sizeof_function_type); 339 else if (exprType->isVoidType()) 340 Diag(OpLoc, diag::ext_sizeof_void_type, isSizeof ? "sizeof" : "__alignof"); 341 else if (exprType->isIncompleteType()) { 342 Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 343 diag::err_alignof_incomplete_type, 344 exprType.getAsString()); 345 return QualType(); // error 346 } 347 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 348 return Context.getSizeType(); 349} 350 351Action::ExprResult Sema:: 352ActOnSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, 353 SourceLocation LPLoc, TypeTy *Ty, 354 SourceLocation RPLoc) { 355 // If error parsing type, ignore. 356 if (Ty == 0) return true; 357 358 // Verify that this is a valid expression. 359 QualType ArgTy = QualType::getFromOpaquePtr(Ty); 360 361 QualType resultType = CheckSizeOfAlignOfOperand(ArgTy, OpLoc, isSizeof); 362 363 if (resultType.isNull()) 364 return true; 365 return new SizeOfAlignOfTypeExpr(isSizeof, ArgTy, resultType, OpLoc, RPLoc); 366} 367 368QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 369 DefaultFunctionArrayConversion(V); 370 371 // These operators return the element type of a complex type. 372 if (const ComplexType *CT = V->getType()->getAsComplexType()) 373 return CT->getElementType(); 374 375 // Otherwise they pass through real integer and floating point types here. 376 if (V->getType()->isArithmeticType()) 377 return V->getType(); 378 379 // Reject anything else. 380 Diag(Loc, diag::err_realimag_invalid_type, V->getType().getAsString()); 381 return QualType(); 382} 383 384 385 386Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 387 tok::TokenKind Kind, 388 ExprTy *Input) { 389 UnaryOperator::Opcode Opc; 390 switch (Kind) { 391 default: assert(0 && "Unknown unary op!"); 392 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 393 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 394 } 395 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 396 if (result.isNull()) 397 return true; 398 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 399} 400 401Action::ExprResult Sema:: 402ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 403 ExprTy *Idx, SourceLocation RLoc) { 404 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 405 406 // Perform default conversions. 407 DefaultFunctionArrayConversion(LHSExp); 408 DefaultFunctionArrayConversion(RHSExp); 409 410 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 411 412 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 413 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 414 // in the subscript position. As a result, we need to derive the array base 415 // and index from the expression types. 416 Expr *BaseExpr, *IndexExpr; 417 QualType ResultType; 418 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 419 BaseExpr = LHSExp; 420 IndexExpr = RHSExp; 421 // FIXME: need to deal with const... 422 ResultType = PTy->getPointeeType(); 423 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 424 // Handle the uncommon case of "123[Ptr]". 425 BaseExpr = RHSExp; 426 IndexExpr = LHSExp; 427 // FIXME: need to deal with const... 428 ResultType = PTy->getPointeeType(); 429 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 430 BaseExpr = LHSExp; // vectors: V[123] 431 IndexExpr = RHSExp; 432 433 // Component access limited to variables (reject vec4.rg[1]). 434 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 435 !isa<ExtVectorElementExpr>(BaseExpr)) 436 return Diag(LLoc, diag::err_ext_vector_component_access, 437 SourceRange(LLoc, RLoc)); 438 // FIXME: need to deal with const... 439 ResultType = VTy->getElementType(); 440 } else { 441 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value, 442 RHSExp->getSourceRange()); 443 } 444 // C99 6.5.2.1p1 445 if (!IndexExpr->getType()->isIntegerType()) 446 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript, 447 IndexExpr->getSourceRange()); 448 449 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 450 // the following check catches trying to index a pointer to a function (e.g. 451 // void (*)(int)) and pointers to incomplete types. Functions are not 452 // objects in C99. 453 if (!ResultType->isObjectType()) 454 return Diag(BaseExpr->getLocStart(), 455 diag::err_typecheck_subscript_not_object, 456 BaseExpr->getType().getAsString(), BaseExpr->getSourceRange()); 457 458 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 459} 460 461QualType Sema:: 462CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 463 IdentifierInfo &CompName, SourceLocation CompLoc) { 464 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 465 466 // This flag determines whether or not the component is to be treated as a 467 // special name, or a regular GLSL-style component access. 468 bool SpecialComponent = false; 469 470 // The vector accessor can't exceed the number of elements. 471 const char *compStr = CompName.getName(); 472 if (strlen(compStr) > vecType->getNumElements()) { 473 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 474 baseType.getAsString(), SourceRange(CompLoc)); 475 return QualType(); 476 } 477 478 // Check that we've found one of the special components, or that the component 479 // names must come from the same set. 480 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 481 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 482 SpecialComponent = true; 483 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 484 do 485 compStr++; 486 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 487 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 488 do 489 compStr++; 490 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 491 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 492 do 493 compStr++; 494 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 495 } 496 497 if (!SpecialComponent && *compStr) { 498 // We didn't get to the end of the string. This means the component names 499 // didn't come from the same set *or* we encountered an illegal name. 500 Diag(OpLoc, diag::err_ext_vector_component_name_illegal, 501 std::string(compStr,compStr+1), SourceRange(CompLoc)); 502 return QualType(); 503 } 504 // Each component accessor can't exceed the vector type. 505 compStr = CompName.getName(); 506 while (*compStr) { 507 if (vecType->isAccessorWithinNumElements(*compStr)) 508 compStr++; 509 else 510 break; 511 } 512 if (!SpecialComponent && *compStr) { 513 // We didn't get to the end of the string. This means a component accessor 514 // exceeds the number of elements in the vector. 515 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 516 baseType.getAsString(), SourceRange(CompLoc)); 517 return QualType(); 518 } 519 520 // If we have a special component name, verify that the current vector length 521 // is an even number, since all special component names return exactly half 522 // the elements. 523 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 524 return QualType(); 525 } 526 527 // The component accessor looks fine - now we need to compute the actual type. 528 // The vector type is implied by the component accessor. For example, 529 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 530 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 531 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 532 : strlen(CompName.getName()); 533 if (CompSize == 1) 534 return vecType->getElementType(); 535 536 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 537 // Now look up the TypeDefDecl from the vector type. Without this, 538 // diagostics look bad. We want extended vector types to appear built-in. 539 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 540 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 541 return Context.getTypedefType(ExtVectorDecls[i]); 542 } 543 return VT; // should never get here (a typedef type should always be found). 544} 545 546Action::ExprResult Sema:: 547ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 548 tok::TokenKind OpKind, SourceLocation MemberLoc, 549 IdentifierInfo &Member) { 550 Expr *BaseExpr = static_cast<Expr *>(Base); 551 assert(BaseExpr && "no record expression"); 552 553 // Perform default conversions. 554 DefaultFunctionArrayConversion(BaseExpr); 555 556 QualType BaseType = BaseExpr->getType(); 557 assert(!BaseType.isNull() && "no type for member expression"); 558 559 if (OpKind == tok::arrow) { 560 if (const PointerType *PT = BaseType->getAsPointerType()) 561 BaseType = PT->getPointeeType(); 562 else 563 return Diag(OpLoc, diag::err_typecheck_member_reference_arrow, 564 SourceRange(MemberLoc)); 565 } 566 // The base type is either a record or an ExtVectorType. 567 if (const RecordType *RTy = BaseType->getAsRecordType()) { 568 RecordDecl *RDecl = RTy->getDecl(); 569 if (RTy->isIncompleteType()) 570 return Diag(OpLoc, diag::err_typecheck_incomplete_tag, RDecl->getName(), 571 BaseExpr->getSourceRange()); 572 // The record definition is complete, now make sure the member is valid. 573 FieldDecl *MemberDecl = RDecl->getMember(&Member); 574 if (!MemberDecl) 575 return Diag(OpLoc, diag::err_typecheck_no_member, Member.getName(), 576 SourceRange(MemberLoc)); 577 578 // Figure out the type of the member; see C99 6.5.2.3p3 579 // FIXME: Handle address space modifiers 580 QualType MemberType = MemberDecl->getType(); 581 unsigned combinedQualifiers = 582 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 583 MemberType = MemberType.getQualifiedType(combinedQualifiers); 584 585 return new MemberExpr(BaseExpr, OpKind==tok::arrow, MemberDecl, 586 MemberLoc, MemberType); 587 } else if (BaseType->isExtVectorType() && OpKind == tok::period) { 588 // Component access limited to variables (reject vec4.rg.g). 589 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 590 !isa<ExtVectorElementExpr>(BaseExpr)) 591 return Diag(OpLoc, diag::err_ext_vector_component_access, 592 SourceRange(MemberLoc)); 593 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 594 if (ret.isNull()) 595 return true; 596 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 597 } else if (BaseType->isObjCInterfaceType()) { 598 ObjCInterfaceDecl *IFace; 599 if (isa<ObjCInterfaceType>(BaseType.getCanonicalType())) 600 IFace = dyn_cast<ObjCInterfaceType>(BaseType)->getDecl(); 601 else 602 IFace = dyn_cast<ObjCQualifiedInterfaceType>(BaseType)->getDecl(); 603 ObjCInterfaceDecl *clsDeclared; 604 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&Member, clsDeclared)) 605 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 606 OpKind==tok::arrow); 607 } 608 return Diag(OpLoc, diag::err_typecheck_member_reference_structUnion, 609 SourceRange(MemberLoc)); 610} 611 612/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 613/// This provides the location of the left/right parens and a list of comma 614/// locations. 615Action::ExprResult Sema:: 616ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 617 ExprTy **args, unsigned NumArgs, 618 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 619 Expr *Fn = static_cast<Expr *>(fn); 620 Expr **Args = reinterpret_cast<Expr**>(args); 621 assert(Fn && "no function call expression"); 622 FunctionDecl *FDecl = NULL; 623 624 // Promote the function operand. 625 UsualUnaryConversions(Fn); 626 627 // If we're directly calling a function, get the declaration for 628 // that function. 629 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 630 if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr())) 631 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 632 633 // Make the call expr early, before semantic checks. This guarantees cleanup 634 // of arguments and function on error. 635 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 636 Context.BoolTy, RParenLoc)); 637 638 // C99 6.5.2.2p1 - "The expression that denotes the called function shall have 639 // type pointer to function". 640 const PointerType *PT = Fn->getType()->getAsPointerType(); 641 if (PT == 0) 642 return Diag(Fn->getLocStart(), diag::err_typecheck_call_not_function, 643 SourceRange(Fn->getLocStart(), RParenLoc)); 644 const FunctionType *FuncT = PT->getPointeeType()->getAsFunctionType(); 645 if (FuncT == 0) 646 return Diag(Fn->getLocStart(), diag::err_typecheck_call_not_function, 647 SourceRange(Fn->getLocStart(), RParenLoc)); 648 649 // We know the result type of the call, set it. 650 TheCall->setType(FuncT->getResultType()); 651 652 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 653 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 654 // assignment, to the types of the corresponding parameter, ... 655 unsigned NumArgsInProto = Proto->getNumArgs(); 656 unsigned NumArgsToCheck = NumArgs; 657 658 // If too few arguments are available (and we don't have default 659 // arguments for the remaining parameters), don't make the call. 660 if (NumArgs < NumArgsInProto) { 661 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 662 // Use default arguments for missing arguments 663 NumArgsToCheck = NumArgsInProto; 664 TheCall->setNumArgs(NumArgsInProto); 665 } else 666 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 667 Fn->getSourceRange()); 668 } 669 670 // If too many are passed and not variadic, error on the extras and drop 671 // them. 672 if (NumArgs > NumArgsInProto) { 673 if (!Proto->isVariadic()) { 674 Diag(Args[NumArgsInProto]->getLocStart(), 675 diag::err_typecheck_call_too_many_args, Fn->getSourceRange(), 676 SourceRange(Args[NumArgsInProto]->getLocStart(), 677 Args[NumArgs-1]->getLocEnd())); 678 // This deletes the extra arguments. 679 TheCall->setNumArgs(NumArgsInProto); 680 } 681 NumArgsToCheck = NumArgsInProto; 682 } 683 684 // Continue to check argument types (even if we have too few/many args). 685 for (unsigned i = 0; i != NumArgsToCheck; i++) { 686 QualType ProtoArgType = Proto->getArgType(i); 687 688 Expr *Arg; 689 if (i < NumArgs) 690 Arg = Args[i]; 691 else 692 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 693 QualType ArgType = Arg->getType(); 694 695 // Compute implicit casts from the operand to the formal argument type. 696 AssignConvertType ConvTy = 697 CheckSingleAssignmentConstraints(ProtoArgType, Arg); 698 TheCall->setArg(i, Arg); 699 700 if (DiagnoseAssignmentResult(ConvTy, Arg->getLocStart(), ProtoArgType, 701 ArgType, Arg, "passing")) 702 return true; 703 } 704 705 // If this is a variadic call, handle args passed through "...". 706 if (Proto->isVariadic()) { 707 // Promote the arguments (C99 6.5.2.2p7). 708 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 709 Expr *Arg = Args[i]; 710 DefaultArgumentPromotion(Arg); 711 TheCall->setArg(i, Arg); 712 } 713 } 714 } else { 715 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 716 717 // Promote the arguments (C99 6.5.2.2p6). 718 for (unsigned i = 0; i != NumArgs; i++) { 719 Expr *Arg = Args[i]; 720 DefaultArgumentPromotion(Arg); 721 TheCall->setArg(i, Arg); 722 } 723 } 724 725 // Do special checking on direct calls to functions. 726 if (FDecl && CheckFunctionCall(FDecl, TheCall.get())) 727 return true; 728 729 return TheCall.take(); 730} 731 732Action::ExprResult Sema:: 733ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 734 SourceLocation RParenLoc, ExprTy *InitExpr) { 735 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 736 QualType literalType = QualType::getFromOpaquePtr(Ty); 737 // FIXME: put back this assert when initializers are worked out. 738 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 739 Expr *literalExpr = static_cast<Expr*>(InitExpr); 740 741 // FIXME: add more semantic analysis (C99 6.5.2.5). 742 if (CheckInitializerTypes(literalExpr, literalType)) 743 return true; 744 745 bool isFileScope = !CurFunctionDecl && !CurMethodDecl; 746 if (isFileScope) { // 6.5.2.5p3 747 if (CheckForConstantInitializer(literalExpr, literalType)) 748 return true; 749 } 750 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, isFileScope); 751} 752 753Action::ExprResult Sema:: 754ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 755 SourceLocation RBraceLoc) { 756 Expr **InitList = reinterpret_cast<Expr**>(initlist); 757 758 // Semantic analysis for initializers is done by ActOnDeclarator() and 759 // CheckInitializer() - it requires knowledge of the object being intialized. 760 761 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc); 762 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 763 return E; 764} 765 766bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 767 assert(VectorTy->isVectorType() && "Not a vector type!"); 768 769 if (Ty->isVectorType() || Ty->isIntegerType()) { 770 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 771 return Diag(R.getBegin(), 772 Ty->isVectorType() ? 773 diag::err_invalid_conversion_between_vectors : 774 diag::err_invalid_conversion_between_vector_and_integer, 775 VectorTy.getAsString().c_str(), 776 Ty.getAsString().c_str(), R); 777 } else 778 return Diag(R.getBegin(), 779 diag::err_invalid_conversion_between_vector_and_scalar, 780 VectorTy.getAsString().c_str(), 781 Ty.getAsString().c_str(), R); 782 783 return false; 784} 785 786Action::ExprResult Sema:: 787ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 788 SourceLocation RParenLoc, ExprTy *Op) { 789 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 790 791 Expr *castExpr = static_cast<Expr*>(Op); 792 QualType castType = QualType::getFromOpaquePtr(Ty); 793 794 UsualUnaryConversions(castExpr); 795 796 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 797 // type needs to be scalar. 798 if (!castType->isVoidType()) { // Cast to void allows any expr type. 799 if (!castType->isScalarType() && !castType->isVectorType()) 800 return Diag(LParenLoc, diag::err_typecheck_cond_expect_scalar, 801 castType.getAsString(), SourceRange(LParenLoc, RParenLoc)); 802 if (!castExpr->getType()->isScalarType() && 803 !castExpr->getType()->isVectorType()) 804 return Diag(castExpr->getLocStart(), 805 diag::err_typecheck_expect_scalar_operand, 806 castExpr->getType().getAsString(),castExpr->getSourceRange()); 807 808 if (castExpr->getType()->isVectorType()) { 809 if (CheckVectorCast(SourceRange(LParenLoc, RParenLoc), 810 castExpr->getType(), castType)) 811 return true; 812 } else if (castType->isVectorType()) { 813 if (CheckVectorCast(SourceRange(LParenLoc, RParenLoc), 814 castType, castExpr->getType())) 815 return true; 816 } 817 } 818 return new CastExpr(castType, castExpr, LParenLoc); 819} 820 821/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 822/// In that case, lex = cond. 823inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 824 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 825 UsualUnaryConversions(cond); 826 UsualUnaryConversions(lex); 827 UsualUnaryConversions(rex); 828 QualType condT = cond->getType(); 829 QualType lexT = lex->getType(); 830 QualType rexT = rex->getType(); 831 832 // first, check the condition. 833 if (!condT->isScalarType()) { // C99 6.5.15p2 834 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 835 condT.getAsString()); 836 return QualType(); 837 } 838 839 // Now check the two expressions. 840 841 // If both operands have arithmetic type, do the usual arithmetic conversions 842 // to find a common type: C99 6.5.15p3,5. 843 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 844 UsualArithmeticConversions(lex, rex); 845 return lex->getType(); 846 } 847 848 // If both operands are the same structure or union type, the result is that 849 // type. 850 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 851 if (const RecordType *RHSRT = rexT->getAsRecordType()) 852 if (LHSRT->getDecl() == RHSRT->getDecl()) 853 // "If both the operands have structure or union type, the result has 854 // that type." This implies that CV qualifiers are dropped. 855 return lexT.getUnqualifiedType(); 856 } 857 858 // C99 6.5.15p5: "If both operands have void type, the result has void type." 859 if (lexT->isVoidType() && rexT->isVoidType()) 860 return lexT.getUnqualifiedType(); 861 862 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 863 // the type of the other operand." 864 if (lexT->isPointerType() && rex->isNullPointerConstant(Context)) { 865 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 866 return lexT; 867 } 868 if (rexT->isPointerType() && lex->isNullPointerConstant(Context)) { 869 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 870 return rexT; 871 } 872 // Handle the case where both operands are pointers before we handle null 873 // pointer constants in case both operands are null pointer constants. 874 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 875 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 876 // get the "pointed to" types 877 QualType lhptee = LHSPT->getPointeeType(); 878 QualType rhptee = RHSPT->getPointeeType(); 879 880 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 881 if (lhptee->isVoidType() && 882 rhptee->isIncompleteOrObjectType()) { 883 // Figure out necessary qualifiers (C99 6.5.15p6) 884 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 885 QualType destType = Context.getPointerType(destPointee); 886 ImpCastExprToType(lex, destType); // add qualifiers if necessary 887 ImpCastExprToType(rex, destType); // promote to void* 888 return destType; 889 } 890 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 891 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 892 QualType destType = Context.getPointerType(destPointee); 893 ImpCastExprToType(lex, destType); // add qualifiers if necessary 894 ImpCastExprToType(rex, destType); // promote to void* 895 return destType; 896 } 897 898 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 899 rhptee.getUnqualifiedType())) { 900 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 901 lexT.getAsString(), rexT.getAsString(), 902 lex->getSourceRange(), rex->getSourceRange()); 903 // In this situation, we assume void* type. No especially good 904 // reason, but this is what gcc does, and we do have to pick 905 // to get a consistent AST. 906 QualType voidPtrTy = Context.getPointerType(Context.VoidTy); 907 ImpCastExprToType(lex, voidPtrTy); 908 ImpCastExprToType(rex, voidPtrTy); 909 return voidPtrTy; 910 } 911 // The pointer types are compatible. 912 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 913 // differently qualified versions of compatible types, the result type is 914 // a pointer to an appropriately qualified version of the *composite* 915 // type. 916 // FIXME: Need to return the composite type. 917 // FIXME: Need to add qualifiers 918 return lexT; 919 } 920 } 921 922 // Otherwise, the operands are not compatible. 923 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 924 lexT.getAsString(), rexT.getAsString(), 925 lex->getSourceRange(), rex->getSourceRange()); 926 return QualType(); 927} 928 929/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 930/// in the case of a the GNU conditional expr extension. 931Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 932 SourceLocation ColonLoc, 933 ExprTy *Cond, ExprTy *LHS, 934 ExprTy *RHS) { 935 Expr *CondExpr = (Expr *) Cond; 936 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 937 938 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 939 // was the condition. 940 bool isLHSNull = LHSExpr == 0; 941 if (isLHSNull) 942 LHSExpr = CondExpr; 943 944 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 945 RHSExpr, QuestionLoc); 946 if (result.isNull()) 947 return true; 948 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 949 RHSExpr, result); 950} 951 952/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 953/// do not have a prototype. Arguments that have type float are promoted to 954/// double. All other argument types are converted by UsualUnaryConversions(). 955void Sema::DefaultArgumentPromotion(Expr *&Expr) { 956 QualType Ty = Expr->getType(); 957 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 958 959 if (Ty == Context.FloatTy) 960 ImpCastExprToType(Expr, Context.DoubleTy); 961 else 962 UsualUnaryConversions(Expr); 963} 964 965/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 966void Sema::DefaultFunctionArrayConversion(Expr *&E) { 967 QualType Ty = E->getType(); 968 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 969 970 if (const ReferenceType *ref = Ty->getAsReferenceType()) { 971 ImpCastExprToType(E, ref->getPointeeType()); // C++ [expr] 972 Ty = E->getType(); 973 } 974 if (Ty->isFunctionType()) 975 ImpCastExprToType(E, Context.getPointerType(Ty)); 976 else if (Ty->isArrayType()) 977 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 978} 979 980/// UsualUnaryConversions - Performs various conversions that are common to most 981/// operators (C99 6.3). The conversions of array and function types are 982/// sometimes surpressed. For example, the array->pointer conversion doesn't 983/// apply if the array is an argument to the sizeof or address (&) operators. 984/// In these instances, this routine should *not* be called. 985Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 986 QualType Ty = Expr->getType(); 987 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 988 989 if (const ReferenceType *Ref = Ty->getAsReferenceType()) { 990 ImpCastExprToType(Expr, Ref->getPointeeType()); // C++ [expr] 991 Ty = Expr->getType(); 992 } 993 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 994 ImpCastExprToType(Expr, Context.IntTy); 995 else 996 DefaultFunctionArrayConversion(Expr); 997 998 return Expr; 999} 1000 1001/// UsualArithmeticConversions - Performs various conversions that are common to 1002/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 1003/// routine returns the first non-arithmetic type found. The client is 1004/// responsible for emitting appropriate error diagnostics. 1005/// FIXME: verify the conversion rules for "complex int" are consistent with 1006/// GCC. 1007QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 1008 bool isCompAssign) { 1009 if (!isCompAssign) { 1010 UsualUnaryConversions(lhsExpr); 1011 UsualUnaryConversions(rhsExpr); 1012 } 1013 // For conversion purposes, we ignore any qualifiers. 1014 // For example, "const float" and "float" are equivalent. 1015 QualType lhs = lhsExpr->getType().getCanonicalType().getUnqualifiedType(); 1016 QualType rhs = rhsExpr->getType().getCanonicalType().getUnqualifiedType(); 1017 1018 // If both types are identical, no conversion is needed. 1019 if (lhs == rhs) 1020 return lhs; 1021 1022 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 1023 // The caller can deal with this (e.g. pointer + int). 1024 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 1025 return lhs; 1026 1027 // At this point, we have two different arithmetic types. 1028 1029 // Handle complex types first (C99 6.3.1.8p1). 1030 if (lhs->isComplexType() || rhs->isComplexType()) { 1031 // if we have an integer operand, the result is the complex type. 1032 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 1033 // convert the rhs to the lhs complex type. 1034 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1035 return lhs; 1036 } 1037 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 1038 // convert the lhs to the rhs complex type. 1039 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 1040 return rhs; 1041 } 1042 // This handles complex/complex, complex/float, or float/complex. 1043 // When both operands are complex, the shorter operand is converted to the 1044 // type of the longer, and that is the type of the result. This corresponds 1045 // to what is done when combining two real floating-point operands. 1046 // The fun begins when size promotion occur across type domains. 1047 // From H&S 6.3.4: When one operand is complex and the other is a real 1048 // floating-point type, the less precise type is converted, within it's 1049 // real or complex domain, to the precision of the other type. For example, 1050 // when combining a "long double" with a "double _Complex", the 1051 // "double _Complex" is promoted to "long double _Complex". 1052 int result = Context.getFloatingTypeOrder(lhs, rhs); 1053 1054 if (result > 0) { // The left side is bigger, convert rhs. 1055 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 1056 if (!isCompAssign) 1057 ImpCastExprToType(rhsExpr, rhs); 1058 } else if (result < 0) { // The right side is bigger, convert lhs. 1059 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 1060 if (!isCompAssign) 1061 ImpCastExprToType(lhsExpr, lhs); 1062 } 1063 // At this point, lhs and rhs have the same rank/size. Now, make sure the 1064 // domains match. This is a requirement for our implementation, C99 1065 // does not require this promotion. 1066 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 1067 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 1068 if (!isCompAssign) 1069 ImpCastExprToType(lhsExpr, rhs); 1070 return rhs; 1071 } else { // handle "_Complex double, double". 1072 if (!isCompAssign) 1073 ImpCastExprToType(rhsExpr, lhs); 1074 return lhs; 1075 } 1076 } 1077 return lhs; // The domain/size match exactly. 1078 } 1079 // Now handle "real" floating types (i.e. float, double, long double). 1080 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 1081 // if we have an integer operand, the result is the real floating type. 1082 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 1083 // convert rhs to the lhs floating point type. 1084 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1085 return lhs; 1086 } 1087 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 1088 // convert lhs to the rhs floating point type. 1089 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 1090 return rhs; 1091 } 1092 // We have two real floating types, float/complex combos were handled above. 1093 // Convert the smaller operand to the bigger result. 1094 int result = Context.getFloatingTypeOrder(lhs, rhs); 1095 1096 if (result > 0) { // convert the rhs 1097 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1098 return lhs; 1099 } 1100 if (result < 0) { // convert the lhs 1101 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 1102 return rhs; 1103 } 1104 assert(0 && "Sema::UsualArithmeticConversions(): illegal float comparison"); 1105 } 1106 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 1107 // Handle GCC complex int extension. 1108 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 1109 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 1110 1111 if (lhsComplexInt && rhsComplexInt) { 1112 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 1113 rhsComplexInt->getElementType()) >= 0) { 1114 // convert the rhs 1115 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1116 return lhs; 1117 } 1118 if (!isCompAssign) 1119 ImpCastExprToType(lhsExpr, rhs); // convert the lhs 1120 return rhs; 1121 } else if (lhsComplexInt && rhs->isIntegerType()) { 1122 // convert the rhs to the lhs complex type. 1123 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1124 return lhs; 1125 } else if (rhsComplexInt && lhs->isIntegerType()) { 1126 // convert the lhs to the rhs complex type. 1127 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 1128 return rhs; 1129 } 1130 } 1131 // Finally, we have two differing integer types. 1132 if (Context.getIntegerTypeOrder(lhs, rhs) >= 0) { // convert the rhs 1133 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1134 return lhs; 1135 } 1136 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 1137 return rhs; 1138} 1139 1140// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1141// being closely modeled after the C99 spec:-). The odd characteristic of this 1142// routine is it effectively iqnores the qualifiers on the top level pointee. 1143// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1144// FIXME: add a couple examples in this comment. 1145Sema::AssignConvertType 1146Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1147 QualType lhptee, rhptee; 1148 1149 // get the "pointed to" type (ignoring qualifiers at the top level) 1150 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1151 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1152 1153 // make sure we operate on the canonical type 1154 lhptee = lhptee.getCanonicalType(); 1155 rhptee = rhptee.getCanonicalType(); 1156 1157 AssignConvertType ConvTy = Compatible; 1158 1159 // C99 6.5.16.1p1: This following citation is common to constraints 1160 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1161 // qualifiers of the type *pointed to* by the right; 1162 // FIXME: Handle ASQualType 1163 if ((lhptee.getCVRQualifiers() & rhptee.getCVRQualifiers()) != 1164 rhptee.getCVRQualifiers()) 1165 ConvTy = CompatiblePointerDiscardsQualifiers; 1166 1167 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1168 // incomplete type and the other is a pointer to a qualified or unqualified 1169 // version of void... 1170 if (lhptee->isVoidType()) { 1171 if (rhptee->isIncompleteOrObjectType()) 1172 return ConvTy; 1173 1174 // As an extension, we allow cast to/from void* to function pointer. 1175 assert(rhptee->isFunctionType()); 1176 return FunctionVoidPointer; 1177 } 1178 1179 if (rhptee->isVoidType()) { 1180 if (lhptee->isIncompleteOrObjectType()) 1181 return ConvTy; 1182 1183 // As an extension, we allow cast to/from void* to function pointer. 1184 assert(lhptee->isFunctionType()); 1185 return FunctionVoidPointer; 1186 } 1187 1188 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1189 // unqualified versions of compatible types, ... 1190 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1191 rhptee.getUnqualifiedType())) 1192 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1193 return ConvTy; 1194} 1195 1196/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1197/// has code to accommodate several GCC extensions when type checking 1198/// pointers. Here are some objectionable examples that GCC considers warnings: 1199/// 1200/// int a, *pint; 1201/// short *pshort; 1202/// struct foo *pfoo; 1203/// 1204/// pint = pshort; // warning: assignment from incompatible pointer type 1205/// a = pint; // warning: assignment makes integer from pointer without a cast 1206/// pint = a; // warning: assignment makes pointer from integer without a cast 1207/// pint = pfoo; // warning: assignment from incompatible pointer type 1208/// 1209/// As a result, the code for dealing with pointers is more complex than the 1210/// C99 spec dictates. 1211/// 1212Sema::AssignConvertType 1213Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1214 // Get canonical types. We're not formatting these types, just comparing 1215 // them. 1216 lhsType = lhsType.getCanonicalType(); 1217 rhsType = rhsType.getCanonicalType(); 1218 1219 if (lhsType.getUnqualifiedType() == rhsType.getUnqualifiedType()) 1220 return Compatible; // Common case: fast path an exact match. 1221 1222 if (lhsType->isReferenceType() || rhsType->isReferenceType()) { 1223 if (Context.typesAreCompatible(lhsType, rhsType)) 1224 return Compatible; 1225 return Incompatible; 1226 } 1227 1228 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1229 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1230 return Compatible; 1231 return Incompatible; 1232 } 1233 1234 if (isa<VectorType>(lhsType) || isa<VectorType>(rhsType)) { 1235 // For ExtVector, allow vector splats; float -> <n x float> 1236 if (const ExtVectorType *LV = dyn_cast<ExtVectorType>(lhsType)) { 1237 if (LV->getElementType().getTypePtr() == rhsType.getTypePtr()) 1238 return Compatible; 1239 } 1240 1241 // If LHS and RHS are both vectors of integer or both vectors of floating 1242 // point types, and the total vector length is the same, allow the 1243 // conversion. This is a bitcast; no bits are changed but the result type 1244 // is different. 1245 if (getLangOptions().LaxVectorConversions && 1246 lhsType->isVectorType() && rhsType->isVectorType()) { 1247 if ((lhsType->isIntegerType() && rhsType->isIntegerType()) || 1248 (lhsType->isRealFloatingType() && rhsType->isRealFloatingType())) { 1249 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1250 return Compatible; 1251 } 1252 } 1253 return Incompatible; 1254 } 1255 1256 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1257 return Compatible; 1258 1259 if (isa<PointerType>(lhsType)) { 1260 if (rhsType->isIntegerType()) 1261 return IntToPointer; 1262 1263 if (isa<PointerType>(rhsType)) 1264 return CheckPointerTypesForAssignment(lhsType, rhsType); 1265 return Incompatible; 1266 } 1267 1268 if (isa<PointerType>(rhsType)) { 1269 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1270 if (lhsType->isIntegerType() && lhsType != Context.BoolTy) 1271 return PointerToInt; 1272 1273 if (isa<PointerType>(lhsType)) 1274 return CheckPointerTypesForAssignment(lhsType, rhsType); 1275 return Incompatible; 1276 } 1277 1278 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1279 if (Context.typesAreCompatible(lhsType, rhsType)) 1280 return Compatible; 1281 } 1282 return Incompatible; 1283} 1284 1285Sema::AssignConvertType 1286Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1287 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1288 // a null pointer constant. 1289 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType()) 1290 && rExpr->isNullPointerConstant(Context)) { 1291 ImpCastExprToType(rExpr, lhsType); 1292 return Compatible; 1293 } 1294 // This check seems unnatural, however it is necessary to ensure the proper 1295 // conversion of functions/arrays. If the conversion were done for all 1296 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1297 // expressions that surpress this implicit conversion (&, sizeof). 1298 // 1299 // Suppress this for references: C99 8.5.3p5. FIXME: revisit when references 1300 // are better understood. 1301 if (!lhsType->isReferenceType()) 1302 DefaultFunctionArrayConversion(rExpr); 1303 1304 Sema::AssignConvertType result = 1305 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1306 1307 // C99 6.5.16.1p2: The value of the right operand is converted to the 1308 // type of the assignment expression. 1309 if (rExpr->getType() != lhsType) 1310 ImpCastExprToType(rExpr, lhsType); 1311 return result; 1312} 1313 1314Sema::AssignConvertType 1315Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1316 return CheckAssignmentConstraints(lhsType, rhsType); 1317} 1318 1319QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1320 Diag(loc, diag::err_typecheck_invalid_operands, 1321 lex->getType().getAsString(), rex->getType().getAsString(), 1322 lex->getSourceRange(), rex->getSourceRange()); 1323 return QualType(); 1324} 1325 1326inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1327 Expr *&rex) { 1328 // For conversion purposes, we ignore any qualifiers. 1329 // For example, "const float" and "float" are equivalent. 1330 QualType lhsType = lex->getType().getCanonicalType().getUnqualifiedType(); 1331 QualType rhsType = rex->getType().getCanonicalType().getUnqualifiedType(); 1332 1333 // make sure the vector types are identical. 1334 if (lhsType == rhsType) 1335 return lhsType; 1336 1337 // if the lhs is an extended vector and the rhs is a scalar of the same type, 1338 // promote the rhs to the vector type. 1339 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1340 if (V->getElementType().getCanonicalType().getTypePtr() 1341 == rhsType.getCanonicalType().getTypePtr()) { 1342 ImpCastExprToType(rex, lhsType); 1343 return lhsType; 1344 } 1345 } 1346 1347 // if the rhs is an extended vector and the lhs is a scalar of the same type, 1348 // promote the lhs to the vector type. 1349 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1350 if (V->getElementType().getCanonicalType().getTypePtr() 1351 == lhsType.getCanonicalType().getTypePtr()) { 1352 ImpCastExprToType(lex, rhsType); 1353 return rhsType; 1354 } 1355 } 1356 1357 // You cannot convert between vector values of different size. 1358 Diag(loc, diag::err_typecheck_vector_not_convertable, 1359 lex->getType().getAsString(), rex->getType().getAsString(), 1360 lex->getSourceRange(), rex->getSourceRange()); 1361 return QualType(); 1362} 1363 1364inline QualType Sema::CheckMultiplyDivideOperands( 1365 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1366{ 1367 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1368 1369 if (lhsType->isVectorType() || rhsType->isVectorType()) 1370 return CheckVectorOperands(loc, lex, rex); 1371 1372 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1373 1374 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1375 return compType; 1376 return InvalidOperands(loc, lex, rex); 1377} 1378 1379inline QualType Sema::CheckRemainderOperands( 1380 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1381{ 1382 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1383 1384 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1385 1386 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1387 return compType; 1388 return InvalidOperands(loc, lex, rex); 1389} 1390 1391inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1392 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1393{ 1394 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1395 return CheckVectorOperands(loc, lex, rex); 1396 1397 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1398 1399 // handle the common case first (both operands are arithmetic). 1400 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1401 return compType; 1402 1403 if (lex->getType()->isPointerType() && rex->getType()->isIntegerType()) 1404 return lex->getType(); 1405 if (lex->getType()->isIntegerType() && rex->getType()->isPointerType()) 1406 return rex->getType(); 1407 return InvalidOperands(loc, lex, rex); 1408} 1409 1410// C99 6.5.6 1411QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1412 SourceLocation loc, bool isCompAssign) { 1413 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1414 return CheckVectorOperands(loc, lex, rex); 1415 1416 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1417 1418 // Enforce type constraints: C99 6.5.6p3. 1419 1420 // Handle the common case first (both operands are arithmetic). 1421 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1422 return compType; 1423 1424 // Either ptr - int or ptr - ptr. 1425 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1426 QualType lpointee = LHSPTy->getPointeeType(); 1427 1428 // The LHS must be an object type, not incomplete, function, etc. 1429 if (!lpointee->isObjectType()) { 1430 // Handle the GNU void* extension. 1431 if (lpointee->isVoidType()) { 1432 Diag(loc, diag::ext_gnu_void_ptr, 1433 lex->getSourceRange(), rex->getSourceRange()); 1434 } else { 1435 Diag(loc, diag::err_typecheck_sub_ptr_object, 1436 lex->getType().getAsString(), lex->getSourceRange()); 1437 return QualType(); 1438 } 1439 } 1440 1441 // The result type of a pointer-int computation is the pointer type. 1442 if (rex->getType()->isIntegerType()) 1443 return lex->getType(); 1444 1445 // Handle pointer-pointer subtractions. 1446 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 1447 QualType rpointee = RHSPTy->getPointeeType(); 1448 1449 // RHS must be an object type, unless void (GNU). 1450 if (!rpointee->isObjectType()) { 1451 // Handle the GNU void* extension. 1452 if (rpointee->isVoidType()) { 1453 if (!lpointee->isVoidType()) 1454 Diag(loc, diag::ext_gnu_void_ptr, 1455 lex->getSourceRange(), rex->getSourceRange()); 1456 } else { 1457 Diag(loc, diag::err_typecheck_sub_ptr_object, 1458 rex->getType().getAsString(), rex->getSourceRange()); 1459 return QualType(); 1460 } 1461 } 1462 1463 // Pointee types must be compatible. 1464 if (!Context.typesAreCompatible(lpointee.getUnqualifiedType(), 1465 rpointee.getUnqualifiedType())) { 1466 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 1467 lex->getType().getAsString(), rex->getType().getAsString(), 1468 lex->getSourceRange(), rex->getSourceRange()); 1469 return QualType(); 1470 } 1471 1472 return Context.getPointerDiffType(); 1473 } 1474 } 1475 1476 return InvalidOperands(loc, lex, rex); 1477} 1478 1479// C99 6.5.7 1480QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1481 bool isCompAssign) { 1482 // C99 6.5.7p2: Each of the operands shall have integer type. 1483 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 1484 return InvalidOperands(loc, lex, rex); 1485 1486 // Shifts don't perform usual arithmetic conversions, they just do integer 1487 // promotions on each operand. C99 6.5.7p3 1488 if (!isCompAssign) 1489 UsualUnaryConversions(lex); 1490 UsualUnaryConversions(rex); 1491 1492 // "The type of the result is that of the promoted left operand." 1493 return lex->getType(); 1494} 1495 1496// C99 6.5.8 1497QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1498 bool isRelational) { 1499 // C99 6.5.8p3 / C99 6.5.9p4 1500 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1501 UsualArithmeticConversions(lex, rex); 1502 else { 1503 UsualUnaryConversions(lex); 1504 UsualUnaryConversions(rex); 1505 } 1506 QualType lType = lex->getType(); 1507 QualType rType = rex->getType(); 1508 1509 // For non-floating point types, check for self-comparisons of the form 1510 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 1511 // often indicate logic errors in the program. 1512 if (!lType->isFloatingType()) { 1513 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 1514 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 1515 if (DRL->getDecl() == DRR->getDecl()) 1516 Diag(loc, diag::warn_selfcomparison); 1517 } 1518 1519 if (isRelational) { 1520 if (lType->isRealType() && rType->isRealType()) 1521 return Context.IntTy; 1522 } else { 1523 // Check for comparisons of floating point operands using != and ==. 1524 if (lType->isFloatingType()) { 1525 assert (rType->isFloatingType()); 1526 CheckFloatComparison(loc,lex,rex); 1527 } 1528 1529 if (lType->isArithmeticType() && rType->isArithmeticType()) 1530 return Context.IntTy; 1531 } 1532 1533 bool LHSIsNull = lex->isNullPointerConstant(Context); 1534 bool RHSIsNull = rex->isNullPointerConstant(Context); 1535 1536 // All of the following pointer related warnings are GCC extensions, except 1537 // when handling null pointer constants. One day, we can consider making them 1538 // errors (when -pedantic-errors is enabled). 1539 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 1540 QualType LCanPointeeTy = 1541 lType->getAsPointerType()->getPointeeType().getCanonicalType(); 1542 QualType RCanPointeeTy = 1543 rType->getAsPointerType()->getPointeeType().getCanonicalType(); 1544 1545 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 1546 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 1547 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 1548 RCanPointeeTy.getUnqualifiedType())) { 1549 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 1550 lType.getAsString(), rType.getAsString(), 1551 lex->getSourceRange(), rex->getSourceRange()); 1552 } 1553 ImpCastExprToType(rex, lType); // promote the pointer to pointer 1554 return Context.IntTy; 1555 } 1556 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType()) 1557 && ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 1558 ImpCastExprToType(rex, lType); 1559 return Context.IntTy; 1560 } 1561 if (lType->isPointerType() && rType->isIntegerType()) { 1562 if (!RHSIsNull) 1563 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 1564 lType.getAsString(), rType.getAsString(), 1565 lex->getSourceRange(), rex->getSourceRange()); 1566 ImpCastExprToType(rex, lType); // promote the integer to pointer 1567 return Context.IntTy; 1568 } 1569 if (lType->isIntegerType() && rType->isPointerType()) { 1570 if (!LHSIsNull) 1571 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 1572 lType.getAsString(), rType.getAsString(), 1573 lex->getSourceRange(), rex->getSourceRange()); 1574 ImpCastExprToType(lex, rType); // promote the integer to pointer 1575 return Context.IntTy; 1576 } 1577 return InvalidOperands(loc, lex, rex); 1578} 1579 1580inline QualType Sema::CheckBitwiseOperands( 1581 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1582{ 1583 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1584 return CheckVectorOperands(loc, lex, rex); 1585 1586 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1587 1588 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1589 return compType; 1590 return InvalidOperands(loc, lex, rex); 1591} 1592 1593inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 1594 Expr *&lex, Expr *&rex, SourceLocation loc) 1595{ 1596 UsualUnaryConversions(lex); 1597 UsualUnaryConversions(rex); 1598 1599 if (lex->getType()->isScalarType() || rex->getType()->isScalarType()) 1600 return Context.IntTy; 1601 return InvalidOperands(loc, lex, rex); 1602} 1603 1604inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 1605 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 1606{ 1607 QualType lhsType = lex->getType(); 1608 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 1609 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(); 1610 1611 switch (mlval) { // C99 6.5.16p2 1612 case Expr::MLV_Valid: 1613 break; 1614 case Expr::MLV_ConstQualified: 1615 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 1616 return QualType(); 1617 case Expr::MLV_ArrayType: 1618 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 1619 lhsType.getAsString(), lex->getSourceRange()); 1620 return QualType(); 1621 case Expr::MLV_NotObjectType: 1622 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 1623 lhsType.getAsString(), lex->getSourceRange()); 1624 return QualType(); 1625 case Expr::MLV_InvalidExpression: 1626 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 1627 lex->getSourceRange()); 1628 return QualType(); 1629 case Expr::MLV_IncompleteType: 1630 case Expr::MLV_IncompleteVoidType: 1631 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 1632 lhsType.getAsString(), lex->getSourceRange()); 1633 return QualType(); 1634 case Expr::MLV_DuplicateVectorComponents: 1635 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 1636 lex->getSourceRange()); 1637 return QualType(); 1638 } 1639 1640 AssignConvertType ConvTy; 1641 if (compoundType.isNull()) 1642 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 1643 else 1644 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 1645 1646 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 1647 rex, "assigning")) 1648 return QualType(); 1649 1650 // C99 6.5.16p3: The type of an assignment expression is the type of the 1651 // left operand unless the left operand has qualified type, in which case 1652 // it is the unqualified version of the type of the left operand. 1653 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 1654 // is converted to the type of the assignment expression (above). 1655 // C++ 5.17p1: the type of the assignment expression is that of its left 1656 // oprdu. 1657 return lhsType.getUnqualifiedType(); 1658} 1659 1660inline QualType Sema::CheckCommaOperands( // C99 6.5.17 1661 Expr *&lex, Expr *&rex, SourceLocation loc) { 1662 UsualUnaryConversions(rex); 1663 return rex->getType(); 1664} 1665 1666/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 1667/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 1668QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 1669 QualType resType = op->getType(); 1670 assert(!resType.isNull() && "no type for increment/decrement expression"); 1671 1672 // C99 6.5.2.4p1: We allow complex as a GCC extension. 1673 if (const PointerType *pt = resType->getAsPointerType()) { 1674 if (!pt->getPointeeType()->isObjectType()) { // C99 6.5.2.4p2, 6.5.6p2 1675 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 1676 resType.getAsString(), op->getSourceRange()); 1677 return QualType(); 1678 } 1679 } else if (!resType->isRealType()) { 1680 if (resType->isComplexType()) 1681 // C99 does not support ++/-- on complex types. 1682 Diag(OpLoc, diag::ext_integer_increment_complex, 1683 resType.getAsString(), op->getSourceRange()); 1684 else { 1685 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 1686 resType.getAsString(), op->getSourceRange()); 1687 return QualType(); 1688 } 1689 } 1690 // At this point, we know we have a real, complex or pointer type. 1691 // Now make sure the operand is a modifiable lvalue. 1692 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(); 1693 if (mlval != Expr::MLV_Valid) { 1694 // FIXME: emit a more precise diagnostic... 1695 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 1696 op->getSourceRange()); 1697 return QualType(); 1698 } 1699 return resType; 1700} 1701 1702/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 1703/// This routine allows us to typecheck complex/recursive expressions 1704/// where the declaration is needed for type checking. Here are some 1705/// examples: &s.xx, &s.zz[1].yy, &(1+2), &(XX), &"123"[2]. 1706static ValueDecl *getPrimaryDecl(Expr *E) { 1707 switch (E->getStmtClass()) { 1708 case Stmt::DeclRefExprClass: 1709 return cast<DeclRefExpr>(E)->getDecl(); 1710 case Stmt::MemberExprClass: 1711 // Fields cannot be declared with a 'register' storage class. 1712 // &X->f is always ok, even if X is declared register. 1713 if (cast<MemberExpr>(E)->isArrow()) 1714 return 0; 1715 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 1716 case Stmt::ArraySubscriptExprClass: { 1717 // &X[4] and &4[X] is invalid if X is invalid and X is not a pointer. 1718 1719 ValueDecl *VD = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 1720 if (!VD || VD->getType()->isPointerType()) 1721 return 0; 1722 else 1723 return VD; 1724 } 1725 case Stmt::UnaryOperatorClass: 1726 return getPrimaryDecl(cast<UnaryOperator>(E)->getSubExpr()); 1727 case Stmt::ParenExprClass: 1728 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 1729 case Stmt::ImplicitCastExprClass: 1730 // &X[4] when X is an array, has an implicit cast from array to pointer. 1731 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 1732 default: 1733 return 0; 1734 } 1735} 1736 1737/// CheckAddressOfOperand - The operand of & must be either a function 1738/// designator or an lvalue designating an object. If it is an lvalue, the 1739/// object cannot be declared with storage class register or be a bit field. 1740/// Note: The usual conversions are *not* applied to the operand of the & 1741/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 1742QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 1743 if (getLangOptions().C99) { 1744 // Implement C99-only parts of addressof rules. 1745 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 1746 if (uOp->getOpcode() == UnaryOperator::Deref) 1747 // Per C99 6.5.3.2, the address of a deref always returns a valid result 1748 // (assuming the deref expression is valid). 1749 return uOp->getSubExpr()->getType(); 1750 } 1751 // Technically, there should be a check for array subscript 1752 // expressions here, but the result of one is always an lvalue anyway. 1753 } 1754 ValueDecl *dcl = getPrimaryDecl(op); 1755 Expr::isLvalueResult lval = op->isLvalue(); 1756 1757 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 1758 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 1759 // FIXME: emit more specific diag... 1760 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 1761 op->getSourceRange()); 1762 return QualType(); 1763 } 1764 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 1765 if (MemExpr->getMemberDecl()->isBitField()) { 1766 Diag(OpLoc, diag::err_typecheck_address_of, 1767 std::string("bit-field"), op->getSourceRange()); 1768 return QualType(); 1769 } 1770 // Check for Apple extension for accessing vector components. 1771 } else if (isa<ArraySubscriptExpr>(op) && 1772 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 1773 Diag(OpLoc, diag::err_typecheck_address_of, 1774 std::string("vector"), op->getSourceRange()); 1775 return QualType(); 1776 } else if (dcl) { // C99 6.5.3.2p1 1777 // We have an lvalue with a decl. Make sure the decl is not declared 1778 // with the register storage-class specifier. 1779 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 1780 if (vd->getStorageClass() == VarDecl::Register) { 1781 Diag(OpLoc, diag::err_typecheck_address_of, 1782 std::string("register variable"), op->getSourceRange()); 1783 return QualType(); 1784 } 1785 } else 1786 assert(0 && "Unknown/unexpected decl type"); 1787 } 1788 // If the operand has type "type", the result has type "pointer to type". 1789 return Context.getPointerType(op->getType()); 1790} 1791 1792QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 1793 UsualUnaryConversions(op); 1794 QualType qType = op->getType(); 1795 1796 if (const PointerType *PT = qType->getAsPointerType()) { 1797 // Note that per both C89 and C99, this is always legal, even 1798 // if ptype is an incomplete type or void. 1799 // It would be possible to warn about dereferencing a 1800 // void pointer, but it's completely well-defined, 1801 // and such a warning is unlikely to catch any mistakes. 1802 return PT->getPointeeType(); 1803 } 1804 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 1805 qType.getAsString(), op->getSourceRange()); 1806 return QualType(); 1807} 1808 1809static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 1810 tok::TokenKind Kind) { 1811 BinaryOperator::Opcode Opc; 1812 switch (Kind) { 1813 default: assert(0 && "Unknown binop!"); 1814 case tok::star: Opc = BinaryOperator::Mul; break; 1815 case tok::slash: Opc = BinaryOperator::Div; break; 1816 case tok::percent: Opc = BinaryOperator::Rem; break; 1817 case tok::plus: Opc = BinaryOperator::Add; break; 1818 case tok::minus: Opc = BinaryOperator::Sub; break; 1819 case tok::lessless: Opc = BinaryOperator::Shl; break; 1820 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 1821 case tok::lessequal: Opc = BinaryOperator::LE; break; 1822 case tok::less: Opc = BinaryOperator::LT; break; 1823 case tok::greaterequal: Opc = BinaryOperator::GE; break; 1824 case tok::greater: Opc = BinaryOperator::GT; break; 1825 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 1826 case tok::equalequal: Opc = BinaryOperator::EQ; break; 1827 case tok::amp: Opc = BinaryOperator::And; break; 1828 case tok::caret: Opc = BinaryOperator::Xor; break; 1829 case tok::pipe: Opc = BinaryOperator::Or; break; 1830 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 1831 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 1832 case tok::equal: Opc = BinaryOperator::Assign; break; 1833 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 1834 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 1835 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 1836 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 1837 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 1838 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 1839 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 1840 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 1841 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 1842 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 1843 case tok::comma: Opc = BinaryOperator::Comma; break; 1844 } 1845 return Opc; 1846} 1847 1848static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 1849 tok::TokenKind Kind) { 1850 UnaryOperator::Opcode Opc; 1851 switch (Kind) { 1852 default: assert(0 && "Unknown unary op!"); 1853 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 1854 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 1855 case tok::amp: Opc = UnaryOperator::AddrOf; break; 1856 case tok::star: Opc = UnaryOperator::Deref; break; 1857 case tok::plus: Opc = UnaryOperator::Plus; break; 1858 case tok::minus: Opc = UnaryOperator::Minus; break; 1859 case tok::tilde: Opc = UnaryOperator::Not; break; 1860 case tok::exclaim: Opc = UnaryOperator::LNot; break; 1861 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 1862 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 1863 case tok::kw___real: Opc = UnaryOperator::Real; break; 1864 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 1865 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 1866 } 1867 return Opc; 1868} 1869 1870// Binary Operators. 'Tok' is the token for the operator. 1871Action::ExprResult Sema::ActOnBinOp(SourceLocation TokLoc, tok::TokenKind Kind, 1872 ExprTy *LHS, ExprTy *RHS) { 1873 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 1874 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 1875 1876 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 1877 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 1878 1879 QualType ResultTy; // Result type of the binary operator. 1880 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 1881 1882 switch (Opc) { 1883 default: 1884 assert(0 && "Unknown binary expr!"); 1885 case BinaryOperator::Assign: 1886 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, QualType()); 1887 break; 1888 case BinaryOperator::Mul: 1889 case BinaryOperator::Div: 1890 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc); 1891 break; 1892 case BinaryOperator::Rem: 1893 ResultTy = CheckRemainderOperands(lhs, rhs, TokLoc); 1894 break; 1895 case BinaryOperator::Add: 1896 ResultTy = CheckAdditionOperands(lhs, rhs, TokLoc); 1897 break; 1898 case BinaryOperator::Sub: 1899 ResultTy = CheckSubtractionOperands(lhs, rhs, TokLoc); 1900 break; 1901 case BinaryOperator::Shl: 1902 case BinaryOperator::Shr: 1903 ResultTy = CheckShiftOperands(lhs, rhs, TokLoc); 1904 break; 1905 case BinaryOperator::LE: 1906 case BinaryOperator::LT: 1907 case BinaryOperator::GE: 1908 case BinaryOperator::GT: 1909 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, true); 1910 break; 1911 case BinaryOperator::EQ: 1912 case BinaryOperator::NE: 1913 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, false); 1914 break; 1915 case BinaryOperator::And: 1916 case BinaryOperator::Xor: 1917 case BinaryOperator::Or: 1918 ResultTy = CheckBitwiseOperands(lhs, rhs, TokLoc); 1919 break; 1920 case BinaryOperator::LAnd: 1921 case BinaryOperator::LOr: 1922 ResultTy = CheckLogicalOperands(lhs, rhs, TokLoc); 1923 break; 1924 case BinaryOperator::MulAssign: 1925 case BinaryOperator::DivAssign: 1926 CompTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc, true); 1927 if (!CompTy.isNull()) 1928 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 1929 break; 1930 case BinaryOperator::RemAssign: 1931 CompTy = CheckRemainderOperands(lhs, rhs, TokLoc, true); 1932 if (!CompTy.isNull()) 1933 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 1934 break; 1935 case BinaryOperator::AddAssign: 1936 CompTy = CheckAdditionOperands(lhs, rhs, TokLoc, true); 1937 if (!CompTy.isNull()) 1938 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 1939 break; 1940 case BinaryOperator::SubAssign: 1941 CompTy = CheckSubtractionOperands(lhs, rhs, TokLoc, true); 1942 if (!CompTy.isNull()) 1943 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 1944 break; 1945 case BinaryOperator::ShlAssign: 1946 case BinaryOperator::ShrAssign: 1947 CompTy = CheckShiftOperands(lhs, rhs, TokLoc, true); 1948 if (!CompTy.isNull()) 1949 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 1950 break; 1951 case BinaryOperator::AndAssign: 1952 case BinaryOperator::XorAssign: 1953 case BinaryOperator::OrAssign: 1954 CompTy = CheckBitwiseOperands(lhs, rhs, TokLoc, true); 1955 if (!CompTy.isNull()) 1956 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 1957 break; 1958 case BinaryOperator::Comma: 1959 ResultTy = CheckCommaOperands(lhs, rhs, TokLoc); 1960 break; 1961 } 1962 if (ResultTy.isNull()) 1963 return true; 1964 if (CompTy.isNull()) 1965 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 1966 else 1967 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, TokLoc); 1968} 1969 1970// Unary Operators. 'Tok' is the token for the operator. 1971Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 1972 ExprTy *input) { 1973 Expr *Input = (Expr*)input; 1974 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 1975 QualType resultType; 1976 switch (Opc) { 1977 default: 1978 assert(0 && "Unimplemented unary expr!"); 1979 case UnaryOperator::PreInc: 1980 case UnaryOperator::PreDec: 1981 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 1982 break; 1983 case UnaryOperator::AddrOf: 1984 resultType = CheckAddressOfOperand(Input, OpLoc); 1985 break; 1986 case UnaryOperator::Deref: 1987 DefaultFunctionArrayConversion(Input); 1988 resultType = CheckIndirectionOperand(Input, OpLoc); 1989 break; 1990 case UnaryOperator::Plus: 1991 case UnaryOperator::Minus: 1992 UsualUnaryConversions(Input); 1993 resultType = Input->getType(); 1994 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 1995 return Diag(OpLoc, diag::err_typecheck_unary_expr, 1996 resultType.getAsString()); 1997 break; 1998 case UnaryOperator::Not: // bitwise complement 1999 UsualUnaryConversions(Input); 2000 resultType = Input->getType(); 2001 // C99 6.5.3.3p1. We allow complex as a GCC extension. 2002 if (!resultType->isIntegerType()) { 2003 if (resultType->isComplexType()) 2004 // C99 does not support '~' for complex conjugation. 2005 Diag(OpLoc, diag::ext_integer_complement_complex, 2006 resultType.getAsString()); 2007 else 2008 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2009 resultType.getAsString()); 2010 } 2011 break; 2012 case UnaryOperator::LNot: // logical negation 2013 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2014 DefaultFunctionArrayConversion(Input); 2015 resultType = Input->getType(); 2016 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2017 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2018 resultType.getAsString()); 2019 // LNot always has type int. C99 6.5.3.3p5. 2020 resultType = Context.IntTy; 2021 break; 2022 case UnaryOperator::SizeOf: 2023 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, true); 2024 break; 2025 case UnaryOperator::AlignOf: 2026 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, false); 2027 break; 2028 case UnaryOperator::Real: 2029 case UnaryOperator::Imag: 2030 resultType = CheckRealImagOperand(Input, OpLoc); 2031 break; 2032 case UnaryOperator::Extension: 2033 resultType = Input->getType(); 2034 break; 2035 } 2036 if (resultType.isNull()) 2037 return true; 2038 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2039} 2040 2041/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2042Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2043 SourceLocation LabLoc, 2044 IdentifierInfo *LabelII) { 2045 // Look up the record for this label identifier. 2046 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2047 2048 // If we haven't seen this label yet, create a forward reference. 2049 if (LabelDecl == 0) 2050 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2051 2052 // Create the AST node. The address of a label always has type 'void*'. 2053 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2054 Context.getPointerType(Context.VoidTy)); 2055} 2056 2057Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2058 SourceLocation RPLoc) { // "({..})" 2059 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2060 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2061 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2062 2063 // FIXME: there are a variety of strange constraints to enforce here, for 2064 // example, it is not possible to goto into a stmt expression apparently. 2065 // More semantic analysis is needed. 2066 2067 // FIXME: the last statement in the compount stmt has its value used. We 2068 // should not warn about it being unused. 2069 2070 // If there are sub stmts in the compound stmt, take the type of the last one 2071 // as the type of the stmtexpr. 2072 QualType Ty = Context.VoidTy; 2073 2074 if (!Compound->body_empty()) 2075 if (Expr *LastExpr = dyn_cast<Expr>(Compound->body_back())) 2076 Ty = LastExpr->getType(); 2077 2078 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2079} 2080 2081Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2082 SourceLocation TypeLoc, 2083 TypeTy *argty, 2084 OffsetOfComponent *CompPtr, 2085 unsigned NumComponents, 2086 SourceLocation RPLoc) { 2087 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2088 assert(!ArgTy.isNull() && "Missing type argument!"); 2089 2090 // We must have at least one component that refers to the type, and the first 2091 // one is known to be a field designator. Verify that the ArgTy represents 2092 // a struct/union/class. 2093 if (!ArgTy->isRecordType()) 2094 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2095 2096 // Otherwise, create a compound literal expression as the base, and 2097 // iteratively process the offsetof designators. 2098 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2099 2100 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2101 // GCC extension, diagnose them. 2102 if (NumComponents != 1) 2103 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2104 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2105 2106 for (unsigned i = 0; i != NumComponents; ++i) { 2107 const OffsetOfComponent &OC = CompPtr[i]; 2108 if (OC.isBrackets) { 2109 // Offset of an array sub-field. TODO: Should we allow vector elements? 2110 const ArrayType *AT = Res->getType()->getAsArrayType(); 2111 if (!AT) { 2112 delete Res; 2113 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 2114 Res->getType().getAsString()); 2115 } 2116 2117 // FIXME: C++: Verify that operator[] isn't overloaded. 2118 2119 // C99 6.5.2.1p1 2120 Expr *Idx = static_cast<Expr*>(OC.U.E); 2121 if (!Idx->getType()->isIntegerType()) 2122 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 2123 Idx->getSourceRange()); 2124 2125 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 2126 continue; 2127 } 2128 2129 const RecordType *RC = Res->getType()->getAsRecordType(); 2130 if (!RC) { 2131 delete Res; 2132 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 2133 Res->getType().getAsString()); 2134 } 2135 2136 // Get the decl corresponding to this. 2137 RecordDecl *RD = RC->getDecl(); 2138 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 2139 if (!MemberDecl) 2140 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 2141 OC.U.IdentInfo->getName(), 2142 SourceRange(OC.LocStart, OC.LocEnd)); 2143 2144 // FIXME: C++: Verify that MemberDecl isn't a static field. 2145 // FIXME: Verify that MemberDecl isn't a bitfield. 2146 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 2147 // matter here. 2148 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, MemberDecl->getType()); 2149 } 2150 2151 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 2152 BuiltinLoc); 2153} 2154 2155 2156Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 2157 TypeTy *arg1, TypeTy *arg2, 2158 SourceLocation RPLoc) { 2159 QualType argT1 = QualType::getFromOpaquePtr(arg1); 2160 QualType argT2 = QualType::getFromOpaquePtr(arg2); 2161 2162 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 2163 2164 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 2165} 2166 2167Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 2168 ExprTy *expr1, ExprTy *expr2, 2169 SourceLocation RPLoc) { 2170 Expr *CondExpr = static_cast<Expr*>(cond); 2171 Expr *LHSExpr = static_cast<Expr*>(expr1); 2172 Expr *RHSExpr = static_cast<Expr*>(expr2); 2173 2174 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 2175 2176 // The conditional expression is required to be a constant expression. 2177 llvm::APSInt condEval(32); 2178 SourceLocation ExpLoc; 2179 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 2180 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 2181 CondExpr->getSourceRange()); 2182 2183 // If the condition is > zero, then the AST type is the same as the LSHExpr. 2184 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 2185 RHSExpr->getType(); 2186 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 2187} 2188 2189/// ExprsMatchFnType - return true if the Exprs in array Args have 2190/// QualTypes that match the QualTypes of the arguments of the FnType. 2191/// The number of arguments has already been validated to match the number of 2192/// arguments in FnType. 2193static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType) { 2194 unsigned NumParams = FnType->getNumArgs(); 2195 for (unsigned i = 0; i != NumParams; ++i) { 2196 QualType ExprTy = Args[i]->getType().getCanonicalType(); 2197 QualType ParmTy = FnType->getArgType(i).getCanonicalType(); 2198 2199 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 2200 return false; 2201 } 2202 return true; 2203} 2204 2205Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 2206 SourceLocation *CommaLocs, 2207 SourceLocation BuiltinLoc, 2208 SourceLocation RParenLoc) { 2209 // __builtin_overload requires at least 2 arguments 2210 if (NumArgs < 2) 2211 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2212 SourceRange(BuiltinLoc, RParenLoc)); 2213 2214 // The first argument is required to be a constant expression. It tells us 2215 // the number of arguments to pass to each of the functions to be overloaded. 2216 Expr **Args = reinterpret_cast<Expr**>(args); 2217 Expr *NParamsExpr = Args[0]; 2218 llvm::APSInt constEval(32); 2219 SourceLocation ExpLoc; 2220 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 2221 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2222 NParamsExpr->getSourceRange()); 2223 2224 // Verify that the number of parameters is > 0 2225 unsigned NumParams = constEval.getZExtValue(); 2226 if (NumParams == 0) 2227 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2228 NParamsExpr->getSourceRange()); 2229 // Verify that we have at least 1 + NumParams arguments to the builtin. 2230 if ((NumParams + 1) > NumArgs) 2231 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2232 SourceRange(BuiltinLoc, RParenLoc)); 2233 2234 // Figure out the return type, by matching the args to one of the functions 2235 // listed after the parameters. 2236 OverloadExpr *OE = 0; 2237 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 2238 // UsualUnaryConversions will convert the function DeclRefExpr into a 2239 // pointer to function. 2240 Expr *Fn = UsualUnaryConversions(Args[i]); 2241 FunctionTypeProto *FnType = 0; 2242 if (const PointerType *PT = Fn->getType()->getAsPointerType()) { 2243 QualType PointeeType = PT->getPointeeType().getCanonicalType(); 2244 FnType = dyn_cast<FunctionTypeProto>(PointeeType); 2245 } 2246 2247 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 2248 // parameters, and the number of parameters must match the value passed to 2249 // the builtin. 2250 if (!FnType || (FnType->getNumArgs() != NumParams)) 2251 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 2252 Fn->getSourceRange()); 2253 2254 // Scan the parameter list for the FunctionType, checking the QualType of 2255 // each parameter against the QualTypes of the arguments to the builtin. 2256 // If they match, return a new OverloadExpr. 2257 if (ExprsMatchFnType(Args+1, FnType)) { 2258 if (OE) 2259 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 2260 OE->getFn()->getSourceRange()); 2261 // Remember our match, and continue processing the remaining arguments 2262 // to catch any errors. 2263 OE = new OverloadExpr(Args, NumArgs, i, FnType->getResultType(), 2264 BuiltinLoc, RParenLoc); 2265 } 2266 } 2267 // Return the newly created OverloadExpr node, if we succeded in matching 2268 // exactly one of the candidate functions. 2269 if (OE) 2270 return OE; 2271 2272 // If we didn't find a matching function Expr in the __builtin_overload list 2273 // the return an error. 2274 std::string typeNames; 2275 for (unsigned i = 0; i != NumParams; ++i) { 2276 if (i != 0) typeNames += ", "; 2277 typeNames += Args[i+1]->getType().getAsString(); 2278 } 2279 2280 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 2281 SourceRange(BuiltinLoc, RParenLoc)); 2282} 2283 2284Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 2285 ExprTy *expr, TypeTy *type, 2286 SourceLocation RPLoc) { 2287 Expr *E = static_cast<Expr*>(expr); 2288 QualType T = QualType::getFromOpaquePtr(type); 2289 2290 InitBuiltinVaListType(); 2291 2292 if (CheckAssignmentConstraints(Context.getBuiltinVaListType(), E->getType()) 2293 != Compatible) 2294 return Diag(E->getLocStart(), 2295 diag::err_first_argument_to_va_arg_not_of_type_va_list, 2296 E->getType().getAsString(), 2297 E->getSourceRange()); 2298 2299 // FIXME: Warn if a non-POD type is passed in. 2300 2301 return new VAArgExpr(BuiltinLoc, E, T, RPLoc); 2302} 2303 2304bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 2305 SourceLocation Loc, 2306 QualType DstType, QualType SrcType, 2307 Expr *SrcExpr, const char *Flavor) { 2308 // Decode the result (notice that AST's are still created for extensions). 2309 bool isInvalid = false; 2310 unsigned DiagKind; 2311 switch (ConvTy) { 2312 default: assert(0 && "Unknown conversion type"); 2313 case Compatible: return false; 2314 case PointerToInt: 2315 DiagKind = diag::ext_typecheck_convert_pointer_int; 2316 break; 2317 case IntToPointer: 2318 DiagKind = diag::ext_typecheck_convert_int_pointer; 2319 break; 2320 case IncompatiblePointer: 2321 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 2322 break; 2323 case FunctionVoidPointer: 2324 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 2325 break; 2326 case CompatiblePointerDiscardsQualifiers: 2327 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 2328 break; 2329 case Incompatible: 2330 DiagKind = diag::err_typecheck_convert_incompatible; 2331 isInvalid = true; 2332 break; 2333 } 2334 2335 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 2336 SrcExpr->getSourceRange()); 2337 return isInvalid; 2338} 2339 2340 2341 2342