SemaExpr.cpp revision 05391d26ab56348a43ea4f8059d67f2ce7fc3d77
1//===--- SemaExpr.cpp - Semantic Analysis for Expressions -----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaUtil.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/Expr.h" 18#include "clang/AST/ExprCXX.h" 19#include "clang/AST/ExprObjC.h" 20#include "clang/Parse/DeclSpec.h" 21#include "clang/Lex/Preprocessor.h" 22#include "clang/Lex/LiteralSupport.h" 23#include "clang/Basic/SourceManager.h" 24#include "clang/Basic/TargetInfo.h" 25#include "llvm/ADT/OwningPtr.h" 26#include "llvm/ADT/SmallString.h" 27#include "llvm/ADT/StringExtras.h" 28using namespace clang; 29 30/// ActOnStringLiteral - The specified tokens were lexed as pasted string 31/// fragments (e.g. "foo" "bar" L"baz"). The result string has to handle string 32/// concatenation ([C99 5.1.1.2, translation phase #6]), so it may come from 33/// multiple tokens. However, the common case is that StringToks points to one 34/// string. 35/// 36Action::ExprResult 37Sema::ActOnStringLiteral(const Token *StringToks, unsigned NumStringToks) { 38 assert(NumStringToks && "Must have at least one string!"); 39 40 StringLiteralParser Literal(StringToks, NumStringToks, PP, Context.Target); 41 if (Literal.hadError) 42 return ExprResult(true); 43 44 llvm::SmallVector<SourceLocation, 4> StringTokLocs; 45 for (unsigned i = 0; i != NumStringToks; ++i) 46 StringTokLocs.push_back(StringToks[i].getLocation()); 47 48 // Verify that pascal strings aren't too large. 49 if (Literal.Pascal && Literal.GetStringLength() > 256) 50 return Diag(StringToks[0].getLocation(), diag::err_pascal_string_too_long, 51 SourceRange(StringToks[0].getLocation(), 52 StringToks[NumStringToks-1].getLocation())); 53 54 QualType StrTy = Context.CharTy; 55 if (Literal.AnyWide) StrTy = Context.getWcharType(); 56 if (Literal.Pascal) StrTy = Context.UnsignedCharTy; 57 58 // Get an array type for the string, according to C99 6.4.5. This includes 59 // the nul terminator character as well as the string length for pascal 60 // strings. 61 StrTy = Context.getConstantArrayType(StrTy, 62 llvm::APInt(32, Literal.GetStringLength()+1), 63 ArrayType::Normal, 0); 64 65 // Pass &StringTokLocs[0], StringTokLocs.size() to factory! 66 return new StringLiteral(Literal.GetString(), Literal.GetStringLength(), 67 Literal.AnyWide, StrTy, 68 StringToks[0].getLocation(), 69 StringToks[NumStringToks-1].getLocation()); 70} 71 72 73/// ActOnIdentifierExpr - The parser read an identifier in expression context, 74/// validate it per-C99 6.5.1. HasTrailingLParen indicates whether this 75/// identifier is used in a function call context. 76Sema::ExprResult Sema::ActOnIdentifierExpr(Scope *S, SourceLocation Loc, 77 IdentifierInfo &II, 78 bool HasTrailingLParen) { 79 // Could be enum-constant, value decl, instance variable, etc. 80 Decl *D = LookupDecl(&II, Decl::IDNS_Ordinary, S); 81 82 // If this reference is in an Objective-C method, then ivar lookup happens as 83 // well. 84 if (CurMethodDecl) { 85 ScopedDecl *SD = dyn_cast_or_null<ScopedDecl>(D); 86 // There are two cases to handle here. 1) scoped lookup could have failed, 87 // in which case we should look for an ivar. 2) scoped lookup could have 88 // found a decl, but that decl is outside the current method (i.e. a global 89 // variable). In these two cases, we do a lookup for an ivar with this 90 // name, if the lookup suceeds, we replace it our current decl. 91 if (SD == 0 || SD->isDefinedOutsideFunctionOrMethod()) { 92 ObjCInterfaceDecl *IFace = CurMethodDecl->getClassInterface(), *DeclClass; 93 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&II, DeclClass)) { 94 // FIXME: This should use a new expr for a direct reference, don't turn 95 // this into Self->ivar, just return a BareIVarExpr or something. 96 IdentifierInfo &II = Context.Idents.get("self"); 97 ExprResult SelfExpr = ActOnIdentifierExpr(S, Loc, II, false); 98 return new ObjCIvarRefExpr(IV, IV->getType(), Loc, 99 static_cast<Expr*>(SelfExpr.Val), true, true); 100 } 101 } 102 } 103 104 if (D == 0) { 105 // Otherwise, this could be an implicitly declared function reference (legal 106 // in C90, extension in C99). 107 if (HasTrailingLParen && 108 !getLangOptions().CPlusPlus) // Not in C++. 109 D = ImplicitlyDefineFunction(Loc, II, S); 110 else { 111 // If this name wasn't predeclared and if this is not a function call, 112 // diagnose the problem. 113 return Diag(Loc, diag::err_undeclared_var_use, II.getName()); 114 } 115 } 116 117 if (ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 118 // check if referencing an identifier with __attribute__((deprecated)). 119 if (VD->getAttr<DeprecatedAttr>()) 120 Diag(Loc, diag::warn_deprecated, VD->getName()); 121 122 // Only create DeclRefExpr's for valid Decl's. 123 if (VD->isInvalidDecl()) 124 return true; 125 return new DeclRefExpr(VD, VD->getType(), Loc); 126 } 127 128 if (isa<TypedefDecl>(D)) 129 return Diag(Loc, diag::err_unexpected_typedef, II.getName()); 130 if (isa<ObjCInterfaceDecl>(D)) 131 return Diag(Loc, diag::err_unexpected_interface, II.getName()); 132 if (isa<NamespaceDecl>(D)) 133 return Diag(Loc, diag::err_unexpected_namespace, II.getName()); 134 135 assert(0 && "Invalid decl"); 136 abort(); 137} 138 139Sema::ExprResult Sema::ActOnPreDefinedExpr(SourceLocation Loc, 140 tok::TokenKind Kind) { 141 PreDefinedExpr::IdentType IT; 142 143 switch (Kind) { 144 default: assert(0 && "Unknown simple primary expr!"); 145 case tok::kw___func__: IT = PreDefinedExpr::Func; break; // [C99 6.4.2.2] 146 case tok::kw___FUNCTION__: IT = PreDefinedExpr::Function; break; 147 case tok::kw___PRETTY_FUNCTION__: IT = PreDefinedExpr::PrettyFunction; break; 148 } 149 150 // Verify that this is in a function context. 151 if (CurFunctionDecl == 0 && CurMethodDecl == 0) 152 return Diag(Loc, diag::err_predef_outside_function); 153 154 // Pre-defined identifiers are of type char[x], where x is the length of the 155 // string. 156 unsigned Length; 157 if (CurFunctionDecl) 158 Length = CurFunctionDecl->getIdentifier()->getLength(); 159 else 160 Length = CurMethodDecl->getSynthesizedMethodSize(); 161 162 llvm::APInt LengthI(32, Length + 1); 163 QualType ResTy = Context.CharTy.getQualifiedType(QualType::Const); 164 ResTy = Context.getConstantArrayType(ResTy, LengthI, ArrayType::Normal, 0); 165 return new PreDefinedExpr(Loc, ResTy, IT); 166} 167 168Sema::ExprResult Sema::ActOnCharacterConstant(const Token &Tok) { 169 llvm::SmallString<16> CharBuffer; 170 CharBuffer.resize(Tok.getLength()); 171 const char *ThisTokBegin = &CharBuffer[0]; 172 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 173 174 CharLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 175 Tok.getLocation(), PP); 176 if (Literal.hadError()) 177 return ExprResult(true); 178 179 QualType type = getLangOptions().CPlusPlus ? Context.CharTy : Context.IntTy; 180 181 return new CharacterLiteral(Literal.getValue(), type, Tok.getLocation()); 182} 183 184Action::ExprResult Sema::ActOnNumericConstant(const Token &Tok) { 185 // fast path for a single digit (which is quite common). A single digit 186 // cannot have a trigraph, escaped newline, radix prefix, or type suffix. 187 if (Tok.getLength() == 1) { 188 const char *Ty = PP.getSourceManager().getCharacterData(Tok.getLocation()); 189 190 unsigned IntSize =static_cast<unsigned>(Context.getTypeSize(Context.IntTy)); 191 return ExprResult(new IntegerLiteral(llvm::APInt(IntSize, *Ty-'0'), 192 Context.IntTy, 193 Tok.getLocation())); 194 } 195 llvm::SmallString<512> IntegerBuffer; 196 IntegerBuffer.resize(Tok.getLength()); 197 const char *ThisTokBegin = &IntegerBuffer[0]; 198 199 // Get the spelling of the token, which eliminates trigraphs, etc. 200 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin); 201 NumericLiteralParser Literal(ThisTokBegin, ThisTokBegin+ActualLength, 202 Tok.getLocation(), PP); 203 if (Literal.hadError) 204 return ExprResult(true); 205 206 Expr *Res; 207 208 if (Literal.isFloatingLiteral()) { 209 QualType Ty; 210 const llvm::fltSemantics *Format; 211 212 if (Literal.isFloat) { 213 Ty = Context.FloatTy; 214 Format = Context.Target.getFloatFormat(); 215 } else if (!Literal.isLong) { 216 Ty = Context.DoubleTy; 217 Format = Context.Target.getDoubleFormat(); 218 } else { 219 Ty = Context.LongDoubleTy; 220 Format = Context.Target.getLongDoubleFormat(); 221 } 222 223 // isExact will be set by GetFloatValue(). 224 bool isExact = false; 225 226 Res = new FloatingLiteral(Literal.GetFloatValue(*Format,&isExact), &isExact, 227 Ty, Tok.getLocation()); 228 229 } else if (!Literal.isIntegerLiteral()) { 230 return ExprResult(true); 231 } else { 232 QualType Ty; 233 234 // long long is a C99 feature. 235 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 236 Literal.isLongLong) 237 Diag(Tok.getLocation(), diag::ext_longlong); 238 239 // Get the value in the widest-possible width. 240 llvm::APInt ResultVal(Context.Target.getIntMaxTWidth(), 0); 241 242 if (Literal.GetIntegerValue(ResultVal)) { 243 // If this value didn't fit into uintmax_t, warn and force to ull. 244 Diag(Tok.getLocation(), diag::warn_integer_too_large); 245 Ty = Context.UnsignedLongLongTy; 246 assert(Context.getTypeSize(Ty) == ResultVal.getBitWidth() && 247 "long long is not intmax_t?"); 248 } else { 249 // If this value fits into a ULL, try to figure out what else it fits into 250 // according to the rules of C99 6.4.4.1p5. 251 252 // Octal, Hexadecimal, and integers with a U suffix are allowed to 253 // be an unsigned int. 254 bool AllowUnsigned = Literal.isUnsigned || Literal.getRadix() != 10; 255 256 // Check from smallest to largest, picking the smallest type we can. 257 unsigned Width = 0; 258 if (!Literal.isLong && !Literal.isLongLong) { 259 // Are int/unsigned possibilities? 260 unsigned IntSize = Context.Target.getIntWidth(); 261 262 // Does it fit in a unsigned int? 263 if (ResultVal.isIntN(IntSize)) { 264 // Does it fit in a signed int? 265 if (!Literal.isUnsigned && ResultVal[IntSize-1] == 0) 266 Ty = Context.IntTy; 267 else if (AllowUnsigned) 268 Ty = Context.UnsignedIntTy; 269 Width = IntSize; 270 } 271 } 272 273 // Are long/unsigned long possibilities? 274 if (Ty.isNull() && !Literal.isLongLong) { 275 unsigned LongSize = Context.Target.getLongWidth(); 276 277 // Does it fit in a unsigned long? 278 if (ResultVal.isIntN(LongSize)) { 279 // Does it fit in a signed long? 280 if (!Literal.isUnsigned && ResultVal[LongSize-1] == 0) 281 Ty = Context.LongTy; 282 else if (AllowUnsigned) 283 Ty = Context.UnsignedLongTy; 284 Width = LongSize; 285 } 286 } 287 288 // Finally, check long long if needed. 289 if (Ty.isNull()) { 290 unsigned LongLongSize = Context.Target.getLongLongWidth(); 291 292 // Does it fit in a unsigned long long? 293 if (ResultVal.isIntN(LongLongSize)) { 294 // Does it fit in a signed long long? 295 if (!Literal.isUnsigned && ResultVal[LongLongSize-1] == 0) 296 Ty = Context.LongLongTy; 297 else if (AllowUnsigned) 298 Ty = Context.UnsignedLongLongTy; 299 Width = LongLongSize; 300 } 301 } 302 303 // If we still couldn't decide a type, we probably have something that 304 // does not fit in a signed long long, but has no U suffix. 305 if (Ty.isNull()) { 306 Diag(Tok.getLocation(), diag::warn_integer_too_large_for_signed); 307 Ty = Context.UnsignedLongLongTy; 308 Width = Context.Target.getLongLongWidth(); 309 } 310 311 if (ResultVal.getBitWidth() != Width) 312 ResultVal.trunc(Width); 313 } 314 315 Res = new IntegerLiteral(ResultVal, Ty, Tok.getLocation()); 316 } 317 318 // If this is an imaginary literal, create the ImaginaryLiteral wrapper. 319 if (Literal.isImaginary) 320 Res = new ImaginaryLiteral(Res, Context.getComplexType(Res->getType())); 321 322 return Res; 323} 324 325Action::ExprResult Sema::ActOnParenExpr(SourceLocation L, SourceLocation R, 326 ExprTy *Val) { 327 Expr *E = (Expr *)Val; 328 assert((E != 0) && "ActOnParenExpr() missing expr"); 329 return new ParenExpr(L, R, E); 330} 331 332/// The UsualUnaryConversions() function is *not* called by this routine. 333/// See C99 6.3.2.1p[2-4] for more details. 334QualType Sema::CheckSizeOfAlignOfOperand(QualType exprType, 335 SourceLocation OpLoc, bool isSizeof) { 336 // C99 6.5.3.4p1: 337 if (isa<FunctionType>(exprType) && isSizeof) 338 // alignof(function) is allowed. 339 Diag(OpLoc, diag::ext_sizeof_function_type); 340 else if (exprType->isVoidType()) 341 Diag(OpLoc, diag::ext_sizeof_void_type, isSizeof ? "sizeof" : "__alignof"); 342 else if (exprType->isIncompleteType()) { 343 Diag(OpLoc, isSizeof ? diag::err_sizeof_incomplete_type : 344 diag::err_alignof_incomplete_type, 345 exprType.getAsString()); 346 return QualType(); // error 347 } 348 // C99 6.5.3.4p4: the type (an unsigned integer type) is size_t. 349 return Context.getSizeType(); 350} 351 352Action::ExprResult Sema:: 353ActOnSizeOfAlignOfTypeExpr(SourceLocation OpLoc, bool isSizeof, 354 SourceLocation LPLoc, TypeTy *Ty, 355 SourceLocation RPLoc) { 356 // If error parsing type, ignore. 357 if (Ty == 0) return true; 358 359 // Verify that this is a valid expression. 360 QualType ArgTy = QualType::getFromOpaquePtr(Ty); 361 362 QualType resultType = CheckSizeOfAlignOfOperand(ArgTy, OpLoc, isSizeof); 363 364 if (resultType.isNull()) 365 return true; 366 return new SizeOfAlignOfTypeExpr(isSizeof, ArgTy, resultType, OpLoc, RPLoc); 367} 368 369QualType Sema::CheckRealImagOperand(Expr *&V, SourceLocation Loc) { 370 DefaultFunctionArrayConversion(V); 371 372 // These operators return the element type of a complex type. 373 if (const ComplexType *CT = V->getType()->getAsComplexType()) 374 return CT->getElementType(); 375 376 // Otherwise they pass through real integer and floating point types here. 377 if (V->getType()->isArithmeticType()) 378 return V->getType(); 379 380 // Reject anything else. 381 Diag(Loc, diag::err_realimag_invalid_type, V->getType().getAsString()); 382 return QualType(); 383} 384 385 386 387Action::ExprResult Sema::ActOnPostfixUnaryOp(SourceLocation OpLoc, 388 tok::TokenKind Kind, 389 ExprTy *Input) { 390 UnaryOperator::Opcode Opc; 391 switch (Kind) { 392 default: assert(0 && "Unknown unary op!"); 393 case tok::plusplus: Opc = UnaryOperator::PostInc; break; 394 case tok::minusminus: Opc = UnaryOperator::PostDec; break; 395 } 396 QualType result = CheckIncrementDecrementOperand((Expr *)Input, OpLoc); 397 if (result.isNull()) 398 return true; 399 return new UnaryOperator((Expr *)Input, Opc, result, OpLoc); 400} 401 402Action::ExprResult Sema:: 403ActOnArraySubscriptExpr(ExprTy *Base, SourceLocation LLoc, 404 ExprTy *Idx, SourceLocation RLoc) { 405 Expr *LHSExp = static_cast<Expr*>(Base), *RHSExp = static_cast<Expr*>(Idx); 406 407 // Perform default conversions. 408 DefaultFunctionArrayConversion(LHSExp); 409 DefaultFunctionArrayConversion(RHSExp); 410 411 QualType LHSTy = LHSExp->getType(), RHSTy = RHSExp->getType(); 412 413 // C99 6.5.2.1p2: the expression e1[e2] is by definition precisely equivalent 414 // to the expression *((e1)+(e2)). This means the array "Base" may actually be 415 // in the subscript position. As a result, we need to derive the array base 416 // and index from the expression types. 417 Expr *BaseExpr, *IndexExpr; 418 QualType ResultType; 419 if (const PointerType *PTy = LHSTy->getAsPointerType()) { 420 BaseExpr = LHSExp; 421 IndexExpr = RHSExp; 422 // FIXME: need to deal with const... 423 ResultType = PTy->getPointeeType(); 424 } else if (const PointerType *PTy = RHSTy->getAsPointerType()) { 425 // Handle the uncommon case of "123[Ptr]". 426 BaseExpr = RHSExp; 427 IndexExpr = LHSExp; 428 // FIXME: need to deal with const... 429 ResultType = PTy->getPointeeType(); 430 } else if (const VectorType *VTy = LHSTy->getAsVectorType()) { 431 BaseExpr = LHSExp; // vectors: V[123] 432 IndexExpr = RHSExp; 433 434 // Component access limited to variables (reject vec4.rg[1]). 435 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 436 !isa<ExtVectorElementExpr>(BaseExpr)) 437 return Diag(LLoc, diag::err_ext_vector_component_access, 438 SourceRange(LLoc, RLoc)); 439 // FIXME: need to deal with const... 440 ResultType = VTy->getElementType(); 441 } else { 442 return Diag(LHSExp->getLocStart(), diag::err_typecheck_subscript_value, 443 RHSExp->getSourceRange()); 444 } 445 // C99 6.5.2.1p1 446 if (!IndexExpr->getType()->isIntegerType()) 447 return Diag(IndexExpr->getLocStart(), diag::err_typecheck_subscript, 448 IndexExpr->getSourceRange()); 449 450 // C99 6.5.2.1p1: "shall have type "pointer to *object* type". In practice, 451 // the following check catches trying to index a pointer to a function (e.g. 452 // void (*)(int)) and pointers to incomplete types. Functions are not 453 // objects in C99. 454 if (!ResultType->isObjectType()) 455 return Diag(BaseExpr->getLocStart(), 456 diag::err_typecheck_subscript_not_object, 457 BaseExpr->getType().getAsString(), BaseExpr->getSourceRange()); 458 459 return new ArraySubscriptExpr(LHSExp, RHSExp, ResultType, RLoc); 460} 461 462QualType Sema:: 463CheckExtVectorComponent(QualType baseType, SourceLocation OpLoc, 464 IdentifierInfo &CompName, SourceLocation CompLoc) { 465 const ExtVectorType *vecType = baseType->getAsExtVectorType(); 466 467 // This flag determines whether or not the component is to be treated as a 468 // special name, or a regular GLSL-style component access. 469 bool SpecialComponent = false; 470 471 // The vector accessor can't exceed the number of elements. 472 const char *compStr = CompName.getName(); 473 if (strlen(compStr) > vecType->getNumElements()) { 474 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 475 baseType.getAsString(), SourceRange(CompLoc)); 476 return QualType(); 477 } 478 479 // Check that we've found one of the special components, or that the component 480 // names must come from the same set. 481 if (!strcmp(compStr, "hi") || !strcmp(compStr, "lo") || 482 !strcmp(compStr, "e") || !strcmp(compStr, "o")) { 483 SpecialComponent = true; 484 } else if (vecType->getPointAccessorIdx(*compStr) != -1) { 485 do 486 compStr++; 487 while (*compStr && vecType->getPointAccessorIdx(*compStr) != -1); 488 } else if (vecType->getColorAccessorIdx(*compStr) != -1) { 489 do 490 compStr++; 491 while (*compStr && vecType->getColorAccessorIdx(*compStr) != -1); 492 } else if (vecType->getTextureAccessorIdx(*compStr) != -1) { 493 do 494 compStr++; 495 while (*compStr && vecType->getTextureAccessorIdx(*compStr) != -1); 496 } 497 498 if (!SpecialComponent && *compStr) { 499 // We didn't get to the end of the string. This means the component names 500 // didn't come from the same set *or* we encountered an illegal name. 501 Diag(OpLoc, diag::err_ext_vector_component_name_illegal, 502 std::string(compStr,compStr+1), SourceRange(CompLoc)); 503 return QualType(); 504 } 505 // Each component accessor can't exceed the vector type. 506 compStr = CompName.getName(); 507 while (*compStr) { 508 if (vecType->isAccessorWithinNumElements(*compStr)) 509 compStr++; 510 else 511 break; 512 } 513 if (!SpecialComponent && *compStr) { 514 // We didn't get to the end of the string. This means a component accessor 515 // exceeds the number of elements in the vector. 516 Diag(OpLoc, diag::err_ext_vector_component_exceeds_length, 517 baseType.getAsString(), SourceRange(CompLoc)); 518 return QualType(); 519 } 520 521 // If we have a special component name, verify that the current vector length 522 // is an even number, since all special component names return exactly half 523 // the elements. 524 if (SpecialComponent && (vecType->getNumElements() & 1U)) { 525 return QualType(); 526 } 527 528 // The component accessor looks fine - now we need to compute the actual type. 529 // The vector type is implied by the component accessor. For example, 530 // vec4.b is a float, vec4.xy is a vec2, vec4.rgb is a vec3, etc. 531 // vec4.hi, vec4.lo, vec4.e, and vec4.o all return vec2. 532 unsigned CompSize = SpecialComponent ? vecType->getNumElements() / 2 533 : strlen(CompName.getName()); 534 if (CompSize == 1) 535 return vecType->getElementType(); 536 537 QualType VT = Context.getExtVectorType(vecType->getElementType(), CompSize); 538 // Now look up the TypeDefDecl from the vector type. Without this, 539 // diagostics look bad. We want extended vector types to appear built-in. 540 for (unsigned i = 0, E = ExtVectorDecls.size(); i != E; ++i) { 541 if (ExtVectorDecls[i]->getUnderlyingType() == VT) 542 return Context.getTypedefType(ExtVectorDecls[i]); 543 } 544 return VT; // should never get here (a typedef type should always be found). 545} 546 547Action::ExprResult Sema:: 548ActOnMemberReferenceExpr(ExprTy *Base, SourceLocation OpLoc, 549 tok::TokenKind OpKind, SourceLocation MemberLoc, 550 IdentifierInfo &Member) { 551 Expr *BaseExpr = static_cast<Expr *>(Base); 552 assert(BaseExpr && "no record expression"); 553 554 // Perform default conversions. 555 DefaultFunctionArrayConversion(BaseExpr); 556 557 QualType BaseType = BaseExpr->getType(); 558 assert(!BaseType.isNull() && "no type for member expression"); 559 560 if (OpKind == tok::arrow) { 561 if (const PointerType *PT = BaseType->getAsPointerType()) 562 BaseType = PT->getPointeeType(); 563 else 564 return Diag(OpLoc, diag::err_typecheck_member_reference_arrow, 565 SourceRange(MemberLoc)); 566 } 567 // The base type is either a record or an ExtVectorType. 568 if (const RecordType *RTy = BaseType->getAsRecordType()) { 569 RecordDecl *RDecl = RTy->getDecl(); 570 if (RTy->isIncompleteType()) 571 return Diag(OpLoc, diag::err_typecheck_incomplete_tag, RDecl->getName(), 572 BaseExpr->getSourceRange()); 573 // The record definition is complete, now make sure the member is valid. 574 FieldDecl *MemberDecl = RDecl->getMember(&Member); 575 if (!MemberDecl) 576 return Diag(OpLoc, diag::err_typecheck_no_member, Member.getName(), 577 SourceRange(MemberLoc)); 578 579 // Figure out the type of the member; see C99 6.5.2.3p3 580 // FIXME: Handle address space modifiers 581 QualType MemberType = MemberDecl->getType(); 582 unsigned combinedQualifiers = 583 MemberType.getCVRQualifiers() | BaseType.getCVRQualifiers(); 584 MemberType = MemberType.getQualifiedType(combinedQualifiers); 585 586 return new MemberExpr(BaseExpr, OpKind==tok::arrow, MemberDecl, 587 MemberLoc, MemberType); 588 } else if (BaseType->isExtVectorType() && OpKind == tok::period) { 589 // Component access limited to variables (reject vec4.rg.g). 590 if (!isa<DeclRefExpr>(BaseExpr) && !isa<ArraySubscriptExpr>(BaseExpr) && 591 !isa<ExtVectorElementExpr>(BaseExpr)) 592 return Diag(OpLoc, diag::err_ext_vector_component_access, 593 SourceRange(MemberLoc)); 594 QualType ret = CheckExtVectorComponent(BaseType, OpLoc, Member, MemberLoc); 595 if (ret.isNull()) 596 return true; 597 return new ExtVectorElementExpr(ret, BaseExpr, Member, MemberLoc); 598 } else if (BaseType->isObjCInterfaceType()) { 599 ObjCInterfaceDecl *IFace; 600 if (isa<ObjCInterfaceType>(BaseType.getCanonicalType())) 601 IFace = dyn_cast<ObjCInterfaceType>(BaseType)->getDecl(); 602 else 603 IFace = dyn_cast<ObjCQualifiedInterfaceType>(BaseType)->getDecl(); 604 ObjCInterfaceDecl *clsDeclared; 605 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&Member, clsDeclared)) 606 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 607 OpKind==tok::arrow); 608 } else if (isObjCObjectPointerType(BaseType)) { 609 PointerType *pointerType = static_cast<PointerType*>(BaseType.getTypePtr()); 610 BaseType = pointerType->getPointeeType(); 611 ObjCInterfaceDecl *IFace; 612 if (isa<ObjCInterfaceType>(BaseType.getCanonicalType())) 613 IFace = dyn_cast<ObjCInterfaceType>(BaseType)->getDecl(); 614 else 615 IFace = dyn_cast<ObjCQualifiedInterfaceType>(BaseType)->getDecl(); 616 ObjCInterfaceDecl *clsDeclared; 617 if (ObjCIvarDecl *IV = IFace->lookupInstanceVariable(&Member, clsDeclared)) 618 return new ObjCIvarRefExpr(IV, IV->getType(), MemberLoc, BaseExpr, 619 OpKind==tok::arrow); 620 // Check for properties. 621 if (OpKind==tok::period) { 622 // Before we look for explicit property declarations, we check for 623 // nullary methods (which allow '.' notation). 624 Selector Sel = PP.getSelectorTable().getNullarySelector(&Member); 625 ObjCMethodDecl *MD = IFace->lookupInstanceMethod(Sel); 626 if (MD) 627 return new ObjCPropertyRefExpr(MD, MD->getResultType(), 628 MemberLoc, BaseExpr); 629 // FIXME: Need to deal with setter methods that take 1 argument. E.g.: 630 // @interface NSBundle : NSObject {} 631 // - (NSString *)bundlePath; 632 // - (void)setBundlePath:(NSString *)x; 633 // @end 634 // void someMethod() { frameworkBundle.bundlePath = 0; } 635 // 636 // FIXME: lookup explicit properties... 637 } 638 } 639 return Diag(OpLoc, diag::err_typecheck_member_reference_structUnion, 640 SourceRange(MemberLoc)); 641} 642 643/// ActOnCallExpr - Handle a call to Fn with the specified array of arguments. 644/// This provides the location of the left/right parens and a list of comma 645/// locations. 646Action::ExprResult Sema:: 647ActOnCallExpr(ExprTy *fn, SourceLocation LParenLoc, 648 ExprTy **args, unsigned NumArgs, 649 SourceLocation *CommaLocs, SourceLocation RParenLoc) { 650 Expr *Fn = static_cast<Expr *>(fn); 651 Expr **Args = reinterpret_cast<Expr**>(args); 652 assert(Fn && "no function call expression"); 653 FunctionDecl *FDecl = NULL; 654 655 // Promote the function operand. 656 UsualUnaryConversions(Fn); 657 658 // If we're directly calling a function, get the declaration for 659 // that function. 660 if (ImplicitCastExpr *IcExpr = dyn_cast<ImplicitCastExpr>(Fn)) 661 if (DeclRefExpr *DRExpr = dyn_cast<DeclRefExpr>(IcExpr->getSubExpr())) 662 FDecl = dyn_cast<FunctionDecl>(DRExpr->getDecl()); 663 664 // Make the call expr early, before semantic checks. This guarantees cleanup 665 // of arguments and function on error. 666 llvm::OwningPtr<CallExpr> TheCall(new CallExpr(Fn, Args, NumArgs, 667 Context.BoolTy, RParenLoc)); 668 669 // C99 6.5.2.2p1 - "The expression that denotes the called function shall have 670 // type pointer to function". 671 const PointerType *PT = Fn->getType()->getAsPointerType(); 672 if (PT == 0) 673 return Diag(Fn->getLocStart(), diag::err_typecheck_call_not_function, 674 SourceRange(Fn->getLocStart(), RParenLoc)); 675 const FunctionType *FuncT = PT->getPointeeType()->getAsFunctionType(); 676 if (FuncT == 0) 677 return Diag(Fn->getLocStart(), diag::err_typecheck_call_not_function, 678 SourceRange(Fn->getLocStart(), RParenLoc)); 679 680 // We know the result type of the call, set it. 681 TheCall->setType(FuncT->getResultType()); 682 683 if (const FunctionTypeProto *Proto = dyn_cast<FunctionTypeProto>(FuncT)) { 684 // C99 6.5.2.2p7 - the arguments are implicitly converted, as if by 685 // assignment, to the types of the corresponding parameter, ... 686 unsigned NumArgsInProto = Proto->getNumArgs(); 687 unsigned NumArgsToCheck = NumArgs; 688 689 // If too few arguments are available (and we don't have default 690 // arguments for the remaining parameters), don't make the call. 691 if (NumArgs < NumArgsInProto) { 692 if (FDecl && NumArgs >= FDecl->getMinRequiredArguments()) { 693 // Use default arguments for missing arguments 694 NumArgsToCheck = NumArgsInProto; 695 TheCall->setNumArgs(NumArgsInProto); 696 } else 697 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 698 Fn->getSourceRange()); 699 } 700 701 // If too many are passed and not variadic, error on the extras and drop 702 // them. 703 if (NumArgs > NumArgsInProto) { 704 if (!Proto->isVariadic()) { 705 Diag(Args[NumArgsInProto]->getLocStart(), 706 diag::err_typecheck_call_too_many_args, Fn->getSourceRange(), 707 SourceRange(Args[NumArgsInProto]->getLocStart(), 708 Args[NumArgs-1]->getLocEnd())); 709 // This deletes the extra arguments. 710 TheCall->setNumArgs(NumArgsInProto); 711 } 712 NumArgsToCheck = NumArgsInProto; 713 } 714 715 // Continue to check argument types (even if we have too few/many args). 716 for (unsigned i = 0; i != NumArgsToCheck; i++) { 717 QualType ProtoArgType = Proto->getArgType(i); 718 719 Expr *Arg; 720 if (i < NumArgs) 721 Arg = Args[i]; 722 else 723 Arg = new CXXDefaultArgExpr(FDecl->getParamDecl(i)); 724 QualType ArgType = Arg->getType(); 725 726 // Compute implicit casts from the operand to the formal argument type. 727 AssignConvertType ConvTy = 728 CheckSingleAssignmentConstraints(ProtoArgType, Arg); 729 TheCall->setArg(i, Arg); 730 731 if (DiagnoseAssignmentResult(ConvTy, Arg->getLocStart(), ProtoArgType, 732 ArgType, Arg, "passing")) 733 return true; 734 } 735 736 // If this is a variadic call, handle args passed through "...". 737 if (Proto->isVariadic()) { 738 // Promote the arguments (C99 6.5.2.2p7). 739 for (unsigned i = NumArgsInProto; i != NumArgs; i++) { 740 Expr *Arg = Args[i]; 741 DefaultArgumentPromotion(Arg); 742 TheCall->setArg(i, Arg); 743 } 744 } 745 } else { 746 assert(isa<FunctionTypeNoProto>(FuncT) && "Unknown FunctionType!"); 747 748 // Promote the arguments (C99 6.5.2.2p6). 749 for (unsigned i = 0; i != NumArgs; i++) { 750 Expr *Arg = Args[i]; 751 DefaultArgumentPromotion(Arg); 752 TheCall->setArg(i, Arg); 753 } 754 } 755 756 // Do special checking on direct calls to functions. 757 if (FDecl) 758 return CheckFunctionCall(FDecl, TheCall.take()); 759 760 return TheCall.take(); 761} 762 763Action::ExprResult Sema:: 764ActOnCompoundLiteral(SourceLocation LParenLoc, TypeTy *Ty, 765 SourceLocation RParenLoc, ExprTy *InitExpr) { 766 assert((Ty != 0) && "ActOnCompoundLiteral(): missing type"); 767 QualType literalType = QualType::getFromOpaquePtr(Ty); 768 // FIXME: put back this assert when initializers are worked out. 769 //assert((InitExpr != 0) && "ActOnCompoundLiteral(): missing expression"); 770 Expr *literalExpr = static_cast<Expr*>(InitExpr); 771 772 if (literalType->isArrayType()) { 773 if (literalType->getAsVariableArrayType()) 774 return Diag(LParenLoc, 775 diag::err_variable_object_no_init, 776 SourceRange(LParenLoc, 777 literalExpr->getSourceRange().getEnd())); 778 } else if (literalType->isIncompleteType()) { 779 return Diag(LParenLoc, 780 diag::err_typecheck_decl_incomplete_type, 781 literalType.getAsString(), 782 SourceRange(LParenLoc, 783 literalExpr->getSourceRange().getEnd())); 784 } 785 786 if (CheckInitializerTypes(literalExpr, literalType)) 787 return true; 788 789 bool isFileScope = !CurFunctionDecl && !CurMethodDecl; 790 if (isFileScope) { // 6.5.2.5p3 791 if (CheckForConstantInitializer(literalExpr, literalType)) 792 return true; 793 } 794 return new CompoundLiteralExpr(LParenLoc, literalType, literalExpr, isFileScope); 795} 796 797Action::ExprResult Sema:: 798ActOnInitList(SourceLocation LBraceLoc, ExprTy **initlist, unsigned NumInit, 799 SourceLocation RBraceLoc) { 800 Expr **InitList = reinterpret_cast<Expr**>(initlist); 801 802 // Semantic analysis for initializers is done by ActOnDeclarator() and 803 // CheckInitializer() - it requires knowledge of the object being intialized. 804 805 InitListExpr *E = new InitListExpr(LBraceLoc, InitList, NumInit, RBraceLoc); 806 E->setType(Context.VoidTy); // FIXME: just a place holder for now. 807 return E; 808} 809 810bool Sema::CheckVectorCast(SourceRange R, QualType VectorTy, QualType Ty) { 811 assert(VectorTy->isVectorType() && "Not a vector type!"); 812 813 if (Ty->isVectorType() || Ty->isIntegerType()) { 814 if (Context.getTypeSize(VectorTy) != Context.getTypeSize(Ty)) 815 return Diag(R.getBegin(), 816 Ty->isVectorType() ? 817 diag::err_invalid_conversion_between_vectors : 818 diag::err_invalid_conversion_between_vector_and_integer, 819 VectorTy.getAsString().c_str(), 820 Ty.getAsString().c_str(), R); 821 } else 822 return Diag(R.getBegin(), 823 diag::err_invalid_conversion_between_vector_and_scalar, 824 VectorTy.getAsString().c_str(), 825 Ty.getAsString().c_str(), R); 826 827 return false; 828} 829 830Action::ExprResult Sema:: 831ActOnCastExpr(SourceLocation LParenLoc, TypeTy *Ty, 832 SourceLocation RParenLoc, ExprTy *Op) { 833 assert((Ty != 0) && (Op != 0) && "ActOnCastExpr(): missing type or expr"); 834 835 Expr *castExpr = static_cast<Expr*>(Op); 836 QualType castType = QualType::getFromOpaquePtr(Ty); 837 838 UsualUnaryConversions(castExpr); 839 840 // C99 6.5.4p2: the cast type needs to be void or scalar and the expression 841 // type needs to be scalar. 842 if (!castType->isVoidType()) { // Cast to void allows any expr type. 843 if (!castType->isScalarType() && !castType->isVectorType()) 844 return Diag(LParenLoc, diag::err_typecheck_cond_expect_scalar, 845 castType.getAsString(), SourceRange(LParenLoc, RParenLoc)); 846 if (!castExpr->getType()->isScalarType() && 847 !castExpr->getType()->isVectorType()) 848 return Diag(castExpr->getLocStart(), 849 diag::err_typecheck_expect_scalar_operand, 850 castExpr->getType().getAsString(),castExpr->getSourceRange()); 851 852 if (castExpr->getType()->isVectorType()) { 853 if (CheckVectorCast(SourceRange(LParenLoc, RParenLoc), 854 castExpr->getType(), castType)) 855 return true; 856 } else if (castType->isVectorType()) { 857 if (CheckVectorCast(SourceRange(LParenLoc, RParenLoc), 858 castType, castExpr->getType())) 859 return true; 860 } 861 } 862 return new CastExpr(castType, castExpr, LParenLoc); 863} 864 865/// Note that lex is not null here, even if this is the gnu "x ?: y" extension. 866/// In that case, lex = cond. 867inline QualType Sema::CheckConditionalOperands( // C99 6.5.15 868 Expr *&cond, Expr *&lex, Expr *&rex, SourceLocation questionLoc) { 869 UsualUnaryConversions(cond); 870 UsualUnaryConversions(lex); 871 UsualUnaryConversions(rex); 872 QualType condT = cond->getType(); 873 QualType lexT = lex->getType(); 874 QualType rexT = rex->getType(); 875 876 // first, check the condition. 877 if (!condT->isScalarType()) { // C99 6.5.15p2 878 Diag(cond->getLocStart(), diag::err_typecheck_cond_expect_scalar, 879 condT.getAsString()); 880 return QualType(); 881 } 882 883 // Now check the two expressions. 884 885 // If both operands have arithmetic type, do the usual arithmetic conversions 886 // to find a common type: C99 6.5.15p3,5. 887 if (lexT->isArithmeticType() && rexT->isArithmeticType()) { 888 UsualArithmeticConversions(lex, rex); 889 return lex->getType(); 890 } 891 892 // If both operands are the same structure or union type, the result is that 893 // type. 894 if (const RecordType *LHSRT = lexT->getAsRecordType()) { // C99 6.5.15p3 895 if (const RecordType *RHSRT = rexT->getAsRecordType()) 896 if (LHSRT->getDecl() == RHSRT->getDecl()) 897 // "If both the operands have structure or union type, the result has 898 // that type." This implies that CV qualifiers are dropped. 899 return lexT.getUnqualifiedType(); 900 } 901 902 // C99 6.5.15p5: "If both operands have void type, the result has void type." 903 // The following || allows only one side to be void (a GCC-ism). 904 if (lexT->isVoidType() || rexT->isVoidType()) { 905 if (!lexT->isVoidType()) 906 Diag(rex->getLocStart(), diag::ext_typecheck_cond_one_void, 907 rex->getSourceRange()); 908 if (!rexT->isVoidType()) 909 Diag(lex->getLocStart(), diag::ext_typecheck_cond_one_void, 910 lex->getSourceRange()); 911 return lexT.getUnqualifiedType(); 912 } 913 // C99 6.5.15p6 - "if one operand is a null pointer constant, the result has 914 // the type of the other operand." 915 if (lexT->isPointerType() && rex->isNullPointerConstant(Context)) { 916 ImpCastExprToType(rex, lexT); // promote the null to a pointer. 917 return lexT; 918 } 919 if (rexT->isPointerType() && lex->isNullPointerConstant(Context)) { 920 ImpCastExprToType(lex, rexT); // promote the null to a pointer. 921 return rexT; 922 } 923 // Handle the case where both operands are pointers before we handle null 924 // pointer constants in case both operands are null pointer constants. 925 if (const PointerType *LHSPT = lexT->getAsPointerType()) { // C99 6.5.15p3,6 926 if (const PointerType *RHSPT = rexT->getAsPointerType()) { 927 // get the "pointed to" types 928 QualType lhptee = LHSPT->getPointeeType(); 929 QualType rhptee = RHSPT->getPointeeType(); 930 931 // ignore qualifiers on void (C99 6.5.15p3, clause 6) 932 if (lhptee->isVoidType() && 933 rhptee->isIncompleteOrObjectType()) { 934 // Figure out necessary qualifiers (C99 6.5.15p6) 935 QualType destPointee=lhptee.getQualifiedType(rhptee.getCVRQualifiers()); 936 QualType destType = Context.getPointerType(destPointee); 937 ImpCastExprToType(lex, destType); // add qualifiers if necessary 938 ImpCastExprToType(rex, destType); // promote to void* 939 return destType; 940 } 941 if (rhptee->isVoidType() && lhptee->isIncompleteOrObjectType()) { 942 QualType destPointee=rhptee.getQualifiedType(lhptee.getCVRQualifiers()); 943 QualType destType = Context.getPointerType(destPointee); 944 ImpCastExprToType(lex, destType); // add qualifiers if necessary 945 ImpCastExprToType(rex, destType); // promote to void* 946 return destType; 947 } 948 949 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 950 rhptee.getUnqualifiedType())) { 951 Diag(questionLoc, diag::warn_typecheck_cond_incompatible_pointers, 952 lexT.getAsString(), rexT.getAsString(), 953 lex->getSourceRange(), rex->getSourceRange()); 954 // In this situation, we assume void* type. No especially good 955 // reason, but this is what gcc does, and we do have to pick 956 // to get a consistent AST. 957 QualType voidPtrTy = Context.getPointerType(Context.VoidTy); 958 ImpCastExprToType(lex, voidPtrTy); 959 ImpCastExprToType(rex, voidPtrTy); 960 return voidPtrTy; 961 } 962 // The pointer types are compatible. 963 // C99 6.5.15p6: If both operands are pointers to compatible types *or* to 964 // differently qualified versions of compatible types, the result type is 965 // a pointer to an appropriately qualified version of the *composite* 966 // type. 967 // FIXME: Need to calculate the composite type. 968 // FIXME: Need to add qualifiers 969 QualType compositeType = lexT; 970 ImpCastExprToType(lex, compositeType); 971 ImpCastExprToType(rex, compositeType); 972 return compositeType; 973 } 974 } 975 976 // Otherwise, the operands are not compatible. 977 Diag(questionLoc, diag::err_typecheck_cond_incompatible_operands, 978 lexT.getAsString(), rexT.getAsString(), 979 lex->getSourceRange(), rex->getSourceRange()); 980 return QualType(); 981} 982 983/// ActOnConditionalOp - Parse a ?: operation. Note that 'LHS' may be null 984/// in the case of a the GNU conditional expr extension. 985Action::ExprResult Sema::ActOnConditionalOp(SourceLocation QuestionLoc, 986 SourceLocation ColonLoc, 987 ExprTy *Cond, ExprTy *LHS, 988 ExprTy *RHS) { 989 Expr *CondExpr = (Expr *) Cond; 990 Expr *LHSExpr = (Expr *) LHS, *RHSExpr = (Expr *) RHS; 991 992 // If this is the gnu "x ?: y" extension, analyze the types as though the LHS 993 // was the condition. 994 bool isLHSNull = LHSExpr == 0; 995 if (isLHSNull) 996 LHSExpr = CondExpr; 997 998 QualType result = CheckConditionalOperands(CondExpr, LHSExpr, 999 RHSExpr, QuestionLoc); 1000 if (result.isNull()) 1001 return true; 1002 return new ConditionalOperator(CondExpr, isLHSNull ? 0 : LHSExpr, 1003 RHSExpr, result); 1004} 1005 1006/// DefaultArgumentPromotion (C99 6.5.2.2p6). Used for function calls that 1007/// do not have a prototype. Arguments that have type float are promoted to 1008/// double. All other argument types are converted by UsualUnaryConversions(). 1009void Sema::DefaultArgumentPromotion(Expr *&Expr) { 1010 QualType Ty = Expr->getType(); 1011 assert(!Ty.isNull() && "DefaultArgumentPromotion - missing type"); 1012 1013 if (Ty == Context.FloatTy) 1014 ImpCastExprToType(Expr, Context.DoubleTy); 1015 else 1016 UsualUnaryConversions(Expr); 1017} 1018 1019/// DefaultFunctionArrayConversion (C99 6.3.2.1p3, C99 6.3.2.1p4). 1020void Sema::DefaultFunctionArrayConversion(Expr *&E) { 1021 QualType Ty = E->getType(); 1022 assert(!Ty.isNull() && "DefaultFunctionArrayConversion - missing type"); 1023 1024 if (const ReferenceType *ref = Ty->getAsReferenceType()) { 1025 ImpCastExprToType(E, ref->getPointeeType()); // C++ [expr] 1026 Ty = E->getType(); 1027 } 1028 if (Ty->isFunctionType()) 1029 ImpCastExprToType(E, Context.getPointerType(Ty)); 1030 else if (Ty->isArrayType()) 1031 ImpCastExprToType(E, Context.getArrayDecayedType(Ty)); 1032} 1033 1034/// UsualUnaryConversions - Performs various conversions that are common to most 1035/// operators (C99 6.3). The conversions of array and function types are 1036/// sometimes surpressed. For example, the array->pointer conversion doesn't 1037/// apply if the array is an argument to the sizeof or address (&) operators. 1038/// In these instances, this routine should *not* be called. 1039Expr *Sema::UsualUnaryConversions(Expr *&Expr) { 1040 QualType Ty = Expr->getType(); 1041 assert(!Ty.isNull() && "UsualUnaryConversions - missing type"); 1042 1043 if (const ReferenceType *Ref = Ty->getAsReferenceType()) { 1044 ImpCastExprToType(Expr, Ref->getPointeeType()); // C++ [expr] 1045 Ty = Expr->getType(); 1046 } 1047 if (Ty->isPromotableIntegerType()) // C99 6.3.1.1p2 1048 ImpCastExprToType(Expr, Context.IntTy); 1049 else 1050 DefaultFunctionArrayConversion(Expr); 1051 1052 return Expr; 1053} 1054 1055/// UsualArithmeticConversions - Performs various conversions that are common to 1056/// binary operators (C99 6.3.1.8). If both operands aren't arithmetic, this 1057/// routine returns the first non-arithmetic type found. The client is 1058/// responsible for emitting appropriate error diagnostics. 1059/// FIXME: verify the conversion rules for "complex int" are consistent with 1060/// GCC. 1061QualType Sema::UsualArithmeticConversions(Expr *&lhsExpr, Expr *&rhsExpr, 1062 bool isCompAssign) { 1063 if (!isCompAssign) { 1064 UsualUnaryConversions(lhsExpr); 1065 UsualUnaryConversions(rhsExpr); 1066 } 1067 // For conversion purposes, we ignore any qualifiers. 1068 // For example, "const float" and "float" are equivalent. 1069 QualType lhs = lhsExpr->getType().getCanonicalType().getUnqualifiedType(); 1070 QualType rhs = rhsExpr->getType().getCanonicalType().getUnqualifiedType(); 1071 1072 // If both types are identical, no conversion is needed. 1073 if (lhs == rhs) 1074 return lhs; 1075 1076 // If either side is a non-arithmetic type (e.g. a pointer), we are done. 1077 // The caller can deal with this (e.g. pointer + int). 1078 if (!lhs->isArithmeticType() || !rhs->isArithmeticType()) 1079 return lhs; 1080 1081 // At this point, we have two different arithmetic types. 1082 1083 // Handle complex types first (C99 6.3.1.8p1). 1084 if (lhs->isComplexType() || rhs->isComplexType()) { 1085 // if we have an integer operand, the result is the complex type. 1086 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 1087 // convert the rhs to the lhs complex type. 1088 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1089 return lhs; 1090 } 1091 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 1092 // convert the lhs to the rhs complex type. 1093 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 1094 return rhs; 1095 } 1096 // This handles complex/complex, complex/float, or float/complex. 1097 // When both operands are complex, the shorter operand is converted to the 1098 // type of the longer, and that is the type of the result. This corresponds 1099 // to what is done when combining two real floating-point operands. 1100 // The fun begins when size promotion occur across type domains. 1101 // From H&S 6.3.4: When one operand is complex and the other is a real 1102 // floating-point type, the less precise type is converted, within it's 1103 // real or complex domain, to the precision of the other type. For example, 1104 // when combining a "long double" with a "double _Complex", the 1105 // "double _Complex" is promoted to "long double _Complex". 1106 int result = Context.getFloatingTypeOrder(lhs, rhs); 1107 1108 if (result > 0) { // The left side is bigger, convert rhs. 1109 rhs = Context.getFloatingTypeOfSizeWithinDomain(lhs, rhs); 1110 if (!isCompAssign) 1111 ImpCastExprToType(rhsExpr, rhs); 1112 } else if (result < 0) { // The right side is bigger, convert lhs. 1113 lhs = Context.getFloatingTypeOfSizeWithinDomain(rhs, lhs); 1114 if (!isCompAssign) 1115 ImpCastExprToType(lhsExpr, lhs); 1116 } 1117 // At this point, lhs and rhs have the same rank/size. Now, make sure the 1118 // domains match. This is a requirement for our implementation, C99 1119 // does not require this promotion. 1120 if (lhs != rhs) { // Domains don't match, we have complex/float mix. 1121 if (lhs->isRealFloatingType()) { // handle "double, _Complex double". 1122 if (!isCompAssign) 1123 ImpCastExprToType(lhsExpr, rhs); 1124 return rhs; 1125 } else { // handle "_Complex double, double". 1126 if (!isCompAssign) 1127 ImpCastExprToType(rhsExpr, lhs); 1128 return lhs; 1129 } 1130 } 1131 return lhs; // The domain/size match exactly. 1132 } 1133 // Now handle "real" floating types (i.e. float, double, long double). 1134 if (lhs->isRealFloatingType() || rhs->isRealFloatingType()) { 1135 // if we have an integer operand, the result is the real floating type. 1136 if (rhs->isIntegerType() || rhs->isComplexIntegerType()) { 1137 // convert rhs to the lhs floating point type. 1138 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1139 return lhs; 1140 } 1141 if (lhs->isIntegerType() || lhs->isComplexIntegerType()) { 1142 // convert lhs to the rhs floating point type. 1143 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 1144 return rhs; 1145 } 1146 // We have two real floating types, float/complex combos were handled above. 1147 // Convert the smaller operand to the bigger result. 1148 int result = Context.getFloatingTypeOrder(lhs, rhs); 1149 1150 if (result > 0) { // convert the rhs 1151 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1152 return lhs; 1153 } 1154 if (result < 0) { // convert the lhs 1155 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 1156 return rhs; 1157 } 1158 assert(0 && "Sema::UsualArithmeticConversions(): illegal float comparison"); 1159 } 1160 if (lhs->isComplexIntegerType() || rhs->isComplexIntegerType()) { 1161 // Handle GCC complex int extension. 1162 const ComplexType *lhsComplexInt = lhs->getAsComplexIntegerType(); 1163 const ComplexType *rhsComplexInt = rhs->getAsComplexIntegerType(); 1164 1165 if (lhsComplexInt && rhsComplexInt) { 1166 if (Context.getIntegerTypeOrder(lhsComplexInt->getElementType(), 1167 rhsComplexInt->getElementType()) >= 0) { 1168 // convert the rhs 1169 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1170 return lhs; 1171 } 1172 if (!isCompAssign) 1173 ImpCastExprToType(lhsExpr, rhs); // convert the lhs 1174 return rhs; 1175 } else if (lhsComplexInt && rhs->isIntegerType()) { 1176 // convert the rhs to the lhs complex type. 1177 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1178 return lhs; 1179 } else if (rhsComplexInt && lhs->isIntegerType()) { 1180 // convert the lhs to the rhs complex type. 1181 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); 1182 return rhs; 1183 } 1184 } 1185 // Finally, we have two differing integer types. 1186 if (Context.getIntegerTypeOrder(lhs, rhs) >= 0) { // convert the rhs 1187 if (!isCompAssign) ImpCastExprToType(rhsExpr, lhs); 1188 return lhs; 1189 } 1190 if (!isCompAssign) ImpCastExprToType(lhsExpr, rhs); // convert the lhs 1191 return rhs; 1192} 1193 1194// CheckPointerTypesForAssignment - This is a very tricky routine (despite 1195// being closely modeled after the C99 spec:-). The odd characteristic of this 1196// routine is it effectively iqnores the qualifiers on the top level pointee. 1197// This circumvents the usual type rules specified in 6.2.7p1 & 6.7.5.[1-3]. 1198// FIXME: add a couple examples in this comment. 1199Sema::AssignConvertType 1200Sema::CheckPointerTypesForAssignment(QualType lhsType, QualType rhsType) { 1201 QualType lhptee, rhptee; 1202 1203 // get the "pointed to" type (ignoring qualifiers at the top level) 1204 lhptee = lhsType->getAsPointerType()->getPointeeType(); 1205 rhptee = rhsType->getAsPointerType()->getPointeeType(); 1206 1207 // make sure we operate on the canonical type 1208 lhptee = lhptee.getCanonicalType(); 1209 rhptee = rhptee.getCanonicalType(); 1210 1211 AssignConvertType ConvTy = Compatible; 1212 1213 // C99 6.5.16.1p1: This following citation is common to constraints 1214 // 3 & 4 (below). ...and the type *pointed to* by the left has all the 1215 // qualifiers of the type *pointed to* by the right; 1216 // FIXME: Handle ASQualType 1217 if ((lhptee.getCVRQualifiers() & rhptee.getCVRQualifiers()) != 1218 rhptee.getCVRQualifiers()) 1219 ConvTy = CompatiblePointerDiscardsQualifiers; 1220 1221 // C99 6.5.16.1p1 (constraint 4): If one operand is a pointer to an object or 1222 // incomplete type and the other is a pointer to a qualified or unqualified 1223 // version of void... 1224 if (lhptee->isVoidType()) { 1225 if (rhptee->isIncompleteOrObjectType()) 1226 return ConvTy; 1227 1228 // As an extension, we allow cast to/from void* to function pointer. 1229 assert(rhptee->isFunctionType()); 1230 return FunctionVoidPointer; 1231 } 1232 1233 if (rhptee->isVoidType()) { 1234 if (lhptee->isIncompleteOrObjectType()) 1235 return ConvTy; 1236 1237 // As an extension, we allow cast to/from void* to function pointer. 1238 assert(lhptee->isFunctionType()); 1239 return FunctionVoidPointer; 1240 } 1241 1242 // C99 6.5.16.1p1 (constraint 3): both operands are pointers to qualified or 1243 // unqualified versions of compatible types, ... 1244 if (!Context.typesAreCompatible(lhptee.getUnqualifiedType(), 1245 rhptee.getUnqualifiedType())) 1246 return IncompatiblePointer; // this "trumps" PointerAssignDiscardsQualifiers 1247 return ConvTy; 1248} 1249 1250/// CheckAssignmentConstraints (C99 6.5.16) - This routine currently 1251/// has code to accommodate several GCC extensions when type checking 1252/// pointers. Here are some objectionable examples that GCC considers warnings: 1253/// 1254/// int a, *pint; 1255/// short *pshort; 1256/// struct foo *pfoo; 1257/// 1258/// pint = pshort; // warning: assignment from incompatible pointer type 1259/// a = pint; // warning: assignment makes integer from pointer without a cast 1260/// pint = a; // warning: assignment makes pointer from integer without a cast 1261/// pint = pfoo; // warning: assignment from incompatible pointer type 1262/// 1263/// As a result, the code for dealing with pointers is more complex than the 1264/// C99 spec dictates. 1265/// 1266Sema::AssignConvertType 1267Sema::CheckAssignmentConstraints(QualType lhsType, QualType rhsType) { 1268 // Get canonical types. We're not formatting these types, just comparing 1269 // them. 1270 lhsType = lhsType.getCanonicalType(); 1271 rhsType = rhsType.getCanonicalType(); 1272 1273 if (lhsType.getUnqualifiedType() == rhsType.getUnqualifiedType()) 1274 return Compatible; // Common case: fast path an exact match. 1275 1276 if (lhsType->isReferenceType() || rhsType->isReferenceType()) { 1277 if (Context.typesAreCompatible(lhsType, rhsType)) 1278 return Compatible; 1279 return Incompatible; 1280 } 1281 1282 if (lhsType->isObjCQualifiedIdType() || rhsType->isObjCQualifiedIdType()) { 1283 if (ObjCQualifiedIdTypesAreCompatible(lhsType, rhsType, false)) 1284 return Compatible; 1285 return Incompatible; 1286 } 1287 1288 if (isa<VectorType>(lhsType) || isa<VectorType>(rhsType)) { 1289 // For ExtVector, allow vector splats; float -> <n x float> 1290 if (const ExtVectorType *LV = dyn_cast<ExtVectorType>(lhsType)) { 1291 if (LV->getElementType().getTypePtr() == rhsType.getTypePtr()) 1292 return Compatible; 1293 } 1294 1295 // If LHS and RHS are both vectors of integer or both vectors of floating 1296 // point types, and the total vector length is the same, allow the 1297 // conversion. This is a bitcast; no bits are changed but the result type 1298 // is different. 1299 if (getLangOptions().LaxVectorConversions && 1300 lhsType->isVectorType() && rhsType->isVectorType()) { 1301 if ((lhsType->isIntegerType() && rhsType->isIntegerType()) || 1302 (lhsType->isRealFloatingType() && rhsType->isRealFloatingType())) { 1303 if (Context.getTypeSize(lhsType) == Context.getTypeSize(rhsType)) 1304 return Compatible; 1305 } 1306 } 1307 return Incompatible; 1308 } 1309 1310 if (lhsType->isArithmeticType() && rhsType->isArithmeticType()) 1311 return Compatible; 1312 1313 if (isa<PointerType>(lhsType)) { 1314 if (rhsType->isIntegerType()) 1315 return IntToPointer; 1316 1317 if (isa<PointerType>(rhsType)) 1318 return CheckPointerTypesForAssignment(lhsType, rhsType); 1319 return Incompatible; 1320 } 1321 1322 if (isa<PointerType>(rhsType)) { 1323 // C99 6.5.16.1p1: the left operand is _Bool and the right is a pointer. 1324 if (lhsType->isIntegerType() && lhsType != Context.BoolTy) 1325 return PointerToInt; 1326 1327 if (isa<PointerType>(lhsType)) 1328 return CheckPointerTypesForAssignment(lhsType, rhsType); 1329 return Incompatible; 1330 } 1331 1332 if (isa<TagType>(lhsType) && isa<TagType>(rhsType)) { 1333 if (Context.typesAreCompatible(lhsType, rhsType)) 1334 return Compatible; 1335 } 1336 return Incompatible; 1337} 1338 1339Sema::AssignConvertType 1340Sema::CheckSingleAssignmentConstraints(QualType lhsType, Expr *&rExpr) { 1341 // C99 6.5.16.1p1: the left operand is a pointer and the right is 1342 // a null pointer constant. 1343 if ((lhsType->isPointerType() || lhsType->isObjCQualifiedIdType()) 1344 && rExpr->isNullPointerConstant(Context)) { 1345 ImpCastExprToType(rExpr, lhsType); 1346 return Compatible; 1347 } 1348 // This check seems unnatural, however it is necessary to ensure the proper 1349 // conversion of functions/arrays. If the conversion were done for all 1350 // DeclExpr's (created by ActOnIdentifierExpr), it would mess up the unary 1351 // expressions that surpress this implicit conversion (&, sizeof). 1352 // 1353 // Suppress this for references: C99 8.5.3p5. FIXME: revisit when references 1354 // are better understood. 1355 if (!lhsType->isReferenceType()) 1356 DefaultFunctionArrayConversion(rExpr); 1357 1358 Sema::AssignConvertType result = 1359 CheckAssignmentConstraints(lhsType, rExpr->getType()); 1360 1361 // C99 6.5.16.1p2: The value of the right operand is converted to the 1362 // type of the assignment expression. 1363 if (rExpr->getType() != lhsType) 1364 ImpCastExprToType(rExpr, lhsType); 1365 return result; 1366} 1367 1368Sema::AssignConvertType 1369Sema::CheckCompoundAssignmentConstraints(QualType lhsType, QualType rhsType) { 1370 return CheckAssignmentConstraints(lhsType, rhsType); 1371} 1372 1373QualType Sema::InvalidOperands(SourceLocation loc, Expr *&lex, Expr *&rex) { 1374 Diag(loc, diag::err_typecheck_invalid_operands, 1375 lex->getType().getAsString(), rex->getType().getAsString(), 1376 lex->getSourceRange(), rex->getSourceRange()); 1377 return QualType(); 1378} 1379 1380inline QualType Sema::CheckVectorOperands(SourceLocation loc, Expr *&lex, 1381 Expr *&rex) { 1382 // For conversion purposes, we ignore any qualifiers. 1383 // For example, "const float" and "float" are equivalent. 1384 QualType lhsType = lex->getType().getCanonicalType().getUnqualifiedType(); 1385 QualType rhsType = rex->getType().getCanonicalType().getUnqualifiedType(); 1386 1387 // make sure the vector types are identical. 1388 if (lhsType == rhsType) 1389 return lhsType; 1390 1391 // if the lhs is an extended vector and the rhs is a scalar of the same type, 1392 // promote the rhs to the vector type. 1393 if (const ExtVectorType *V = lhsType->getAsExtVectorType()) { 1394 if (V->getElementType().getCanonicalType().getTypePtr() 1395 == rhsType.getCanonicalType().getTypePtr()) { 1396 ImpCastExprToType(rex, lhsType); 1397 return lhsType; 1398 } 1399 } 1400 1401 // if the rhs is an extended vector and the lhs is a scalar of the same type, 1402 // promote the lhs to the vector type. 1403 if (const ExtVectorType *V = rhsType->getAsExtVectorType()) { 1404 if (V->getElementType().getCanonicalType().getTypePtr() 1405 == lhsType.getCanonicalType().getTypePtr()) { 1406 ImpCastExprToType(lex, rhsType); 1407 return rhsType; 1408 } 1409 } 1410 1411 // You cannot convert between vector values of different size. 1412 Diag(loc, diag::err_typecheck_vector_not_convertable, 1413 lex->getType().getAsString(), rex->getType().getAsString(), 1414 lex->getSourceRange(), rex->getSourceRange()); 1415 return QualType(); 1416} 1417 1418inline QualType Sema::CheckMultiplyDivideOperands( 1419 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1420{ 1421 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1422 1423 if (lhsType->isVectorType() || rhsType->isVectorType()) 1424 return CheckVectorOperands(loc, lex, rex); 1425 1426 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1427 1428 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1429 return compType; 1430 return InvalidOperands(loc, lex, rex); 1431} 1432 1433inline QualType Sema::CheckRemainderOperands( 1434 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1435{ 1436 QualType lhsType = lex->getType(), rhsType = rex->getType(); 1437 1438 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1439 1440 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1441 return compType; 1442 return InvalidOperands(loc, lex, rex); 1443} 1444 1445inline QualType Sema::CheckAdditionOperands( // C99 6.5.6 1446 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1447{ 1448 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1449 return CheckVectorOperands(loc, lex, rex); 1450 1451 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1452 1453 // handle the common case first (both operands are arithmetic). 1454 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1455 return compType; 1456 1457 // Put any potential pointer into PExp 1458 Expr* PExp = lex, *IExp = rex; 1459 if (IExp->getType()->isPointerType()) 1460 std::swap(PExp, IExp); 1461 1462 if (const PointerType* PTy = PExp->getType()->getAsPointerType()) { 1463 if (IExp->getType()->isIntegerType()) { 1464 // Check for arithmetic on pointers to incomplete types 1465 if (!PTy->getPointeeType()->isObjectType()) { 1466 if (PTy->getPointeeType()->isVoidType()) { 1467 Diag(loc, diag::ext_gnu_void_ptr, 1468 lex->getSourceRange(), rex->getSourceRange()); 1469 } else { 1470 Diag(loc, diag::err_typecheck_arithmetic_incomplete_type, 1471 lex->getType().getAsString(), lex->getSourceRange()); 1472 return QualType(); 1473 } 1474 } 1475 return PExp->getType(); 1476 } 1477 } 1478 1479 return InvalidOperands(loc, lex, rex); 1480} 1481 1482// C99 6.5.6 1483QualType Sema::CheckSubtractionOperands(Expr *&lex, Expr *&rex, 1484 SourceLocation loc, bool isCompAssign) { 1485 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1486 return CheckVectorOperands(loc, lex, rex); 1487 1488 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1489 1490 // Enforce type constraints: C99 6.5.6p3. 1491 1492 // Handle the common case first (both operands are arithmetic). 1493 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1494 return compType; 1495 1496 // Either ptr - int or ptr - ptr. 1497 if (const PointerType *LHSPTy = lex->getType()->getAsPointerType()) { 1498 QualType lpointee = LHSPTy->getPointeeType(); 1499 1500 // The LHS must be an object type, not incomplete, function, etc. 1501 if (!lpointee->isObjectType()) { 1502 // Handle the GNU void* extension. 1503 if (lpointee->isVoidType()) { 1504 Diag(loc, diag::ext_gnu_void_ptr, 1505 lex->getSourceRange(), rex->getSourceRange()); 1506 } else { 1507 Diag(loc, diag::err_typecheck_sub_ptr_object, 1508 lex->getType().getAsString(), lex->getSourceRange()); 1509 return QualType(); 1510 } 1511 } 1512 1513 // The result type of a pointer-int computation is the pointer type. 1514 if (rex->getType()->isIntegerType()) 1515 return lex->getType(); 1516 1517 // Handle pointer-pointer subtractions. 1518 if (const PointerType *RHSPTy = rex->getType()->getAsPointerType()) { 1519 QualType rpointee = RHSPTy->getPointeeType(); 1520 1521 // RHS must be an object type, unless void (GNU). 1522 if (!rpointee->isObjectType()) { 1523 // Handle the GNU void* extension. 1524 if (rpointee->isVoidType()) { 1525 if (!lpointee->isVoidType()) 1526 Diag(loc, diag::ext_gnu_void_ptr, 1527 lex->getSourceRange(), rex->getSourceRange()); 1528 } else { 1529 Diag(loc, diag::err_typecheck_sub_ptr_object, 1530 rex->getType().getAsString(), rex->getSourceRange()); 1531 return QualType(); 1532 } 1533 } 1534 1535 // Pointee types must be compatible. 1536 if (!Context.typesAreCompatible(lpointee.getUnqualifiedType(), 1537 rpointee.getUnqualifiedType())) { 1538 Diag(loc, diag::err_typecheck_sub_ptr_compatible, 1539 lex->getType().getAsString(), rex->getType().getAsString(), 1540 lex->getSourceRange(), rex->getSourceRange()); 1541 return QualType(); 1542 } 1543 1544 return Context.getPointerDiffType(); 1545 } 1546 } 1547 1548 return InvalidOperands(loc, lex, rex); 1549} 1550 1551// C99 6.5.7 1552QualType Sema::CheckShiftOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1553 bool isCompAssign) { 1554 // C99 6.5.7p2: Each of the operands shall have integer type. 1555 if (!lex->getType()->isIntegerType() || !rex->getType()->isIntegerType()) 1556 return InvalidOperands(loc, lex, rex); 1557 1558 // Shifts don't perform usual arithmetic conversions, they just do integer 1559 // promotions on each operand. C99 6.5.7p3 1560 if (!isCompAssign) 1561 UsualUnaryConversions(lex); 1562 UsualUnaryConversions(rex); 1563 1564 // "The type of the result is that of the promoted left operand." 1565 return lex->getType(); 1566} 1567 1568// C99 6.5.8 1569QualType Sema::CheckCompareOperands(Expr *&lex, Expr *&rex, SourceLocation loc, 1570 bool isRelational) { 1571 // C99 6.5.8p3 / C99 6.5.9p4 1572 if (lex->getType()->isArithmeticType() && rex->getType()->isArithmeticType()) 1573 UsualArithmeticConversions(lex, rex); 1574 else { 1575 UsualUnaryConversions(lex); 1576 UsualUnaryConversions(rex); 1577 } 1578 QualType lType = lex->getType(); 1579 QualType rType = rex->getType(); 1580 1581 // For non-floating point types, check for self-comparisons of the form 1582 // x == x, x != x, x < x, etc. These always evaluate to a constant, and 1583 // often indicate logic errors in the program. 1584 if (!lType->isFloatingType()) { 1585 if (DeclRefExpr* DRL = dyn_cast<DeclRefExpr>(lex->IgnoreParens())) 1586 if (DeclRefExpr* DRR = dyn_cast<DeclRefExpr>(rex->IgnoreParens())) 1587 if (DRL->getDecl() == DRR->getDecl()) 1588 Diag(loc, diag::warn_selfcomparison); 1589 } 1590 1591 if (isRelational) { 1592 if (lType->isRealType() && rType->isRealType()) 1593 return Context.IntTy; 1594 } else { 1595 // Check for comparisons of floating point operands using != and ==. 1596 if (lType->isFloatingType()) { 1597 assert (rType->isFloatingType()); 1598 CheckFloatComparison(loc,lex,rex); 1599 } 1600 1601 if (lType->isArithmeticType() && rType->isArithmeticType()) 1602 return Context.IntTy; 1603 } 1604 1605 bool LHSIsNull = lex->isNullPointerConstant(Context); 1606 bool RHSIsNull = rex->isNullPointerConstant(Context); 1607 1608 // All of the following pointer related warnings are GCC extensions, except 1609 // when handling null pointer constants. One day, we can consider making them 1610 // errors (when -pedantic-errors is enabled). 1611 if (lType->isPointerType() && rType->isPointerType()) { // C99 6.5.8p2 1612 QualType LCanPointeeTy = 1613 lType->getAsPointerType()->getPointeeType().getCanonicalType(); 1614 QualType RCanPointeeTy = 1615 rType->getAsPointerType()->getPointeeType().getCanonicalType(); 1616 1617 if (!LHSIsNull && !RHSIsNull && // C99 6.5.9p2 1618 !LCanPointeeTy->isVoidType() && !RCanPointeeTy->isVoidType() && 1619 !Context.typesAreCompatible(LCanPointeeTy.getUnqualifiedType(), 1620 RCanPointeeTy.getUnqualifiedType())) { 1621 Diag(loc, diag::ext_typecheck_comparison_of_distinct_pointers, 1622 lType.getAsString(), rType.getAsString(), 1623 lex->getSourceRange(), rex->getSourceRange()); 1624 } 1625 ImpCastExprToType(rex, lType); // promote the pointer to pointer 1626 return Context.IntTy; 1627 } 1628 if ((lType->isObjCQualifiedIdType() || rType->isObjCQualifiedIdType()) 1629 && ObjCQualifiedIdTypesAreCompatible(lType, rType, true)) { 1630 ImpCastExprToType(rex, lType); 1631 return Context.IntTy; 1632 } 1633 if (lType->isPointerType() && rType->isIntegerType()) { 1634 if (!RHSIsNull) 1635 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 1636 lType.getAsString(), rType.getAsString(), 1637 lex->getSourceRange(), rex->getSourceRange()); 1638 ImpCastExprToType(rex, lType); // promote the integer to pointer 1639 return Context.IntTy; 1640 } 1641 if (lType->isIntegerType() && rType->isPointerType()) { 1642 if (!LHSIsNull) 1643 Diag(loc, diag::ext_typecheck_comparison_of_pointer_integer, 1644 lType.getAsString(), rType.getAsString(), 1645 lex->getSourceRange(), rex->getSourceRange()); 1646 ImpCastExprToType(lex, rType); // promote the integer to pointer 1647 return Context.IntTy; 1648 } 1649 return InvalidOperands(loc, lex, rex); 1650} 1651 1652inline QualType Sema::CheckBitwiseOperands( 1653 Expr *&lex, Expr *&rex, SourceLocation loc, bool isCompAssign) 1654{ 1655 if (lex->getType()->isVectorType() || rex->getType()->isVectorType()) 1656 return CheckVectorOperands(loc, lex, rex); 1657 1658 QualType compType = UsualArithmeticConversions(lex, rex, isCompAssign); 1659 1660 if (lex->getType()->isIntegerType() && rex->getType()->isIntegerType()) 1661 return compType; 1662 return InvalidOperands(loc, lex, rex); 1663} 1664 1665inline QualType Sema::CheckLogicalOperands( // C99 6.5.[13,14] 1666 Expr *&lex, Expr *&rex, SourceLocation loc) 1667{ 1668 UsualUnaryConversions(lex); 1669 UsualUnaryConversions(rex); 1670 1671 if (lex->getType()->isScalarType() && rex->getType()->isScalarType()) 1672 return Context.IntTy; 1673 return InvalidOperands(loc, lex, rex); 1674} 1675 1676inline QualType Sema::CheckAssignmentOperands( // C99 6.5.16.1 1677 Expr *lex, Expr *&rex, SourceLocation loc, QualType compoundType) 1678{ 1679 QualType lhsType = lex->getType(); 1680 QualType rhsType = compoundType.isNull() ? rex->getType() : compoundType; 1681 Expr::isModifiableLvalueResult mlval = lex->isModifiableLvalue(); 1682 1683 switch (mlval) { // C99 6.5.16p2 1684 case Expr::MLV_Valid: 1685 break; 1686 case Expr::MLV_ConstQualified: 1687 Diag(loc, diag::err_typecheck_assign_const, lex->getSourceRange()); 1688 return QualType(); 1689 case Expr::MLV_ArrayType: 1690 Diag(loc, diag::err_typecheck_array_not_modifiable_lvalue, 1691 lhsType.getAsString(), lex->getSourceRange()); 1692 return QualType(); 1693 case Expr::MLV_NotObjectType: 1694 Diag(loc, diag::err_typecheck_non_object_not_modifiable_lvalue, 1695 lhsType.getAsString(), lex->getSourceRange()); 1696 return QualType(); 1697 case Expr::MLV_InvalidExpression: 1698 Diag(loc, diag::err_typecheck_expression_not_modifiable_lvalue, 1699 lex->getSourceRange()); 1700 return QualType(); 1701 case Expr::MLV_IncompleteType: 1702 case Expr::MLV_IncompleteVoidType: 1703 Diag(loc, diag::err_typecheck_incomplete_type_not_modifiable_lvalue, 1704 lhsType.getAsString(), lex->getSourceRange()); 1705 return QualType(); 1706 case Expr::MLV_DuplicateVectorComponents: 1707 Diag(loc, diag::err_typecheck_duplicate_vector_components_not_mlvalue, 1708 lex->getSourceRange()); 1709 return QualType(); 1710 } 1711 1712 AssignConvertType ConvTy; 1713 if (compoundType.isNull()) 1714 ConvTy = CheckSingleAssignmentConstraints(lhsType, rex); 1715 else 1716 ConvTy = CheckCompoundAssignmentConstraints(lhsType, rhsType); 1717 1718 if (DiagnoseAssignmentResult(ConvTy, loc, lhsType, rhsType, 1719 rex, "assigning")) 1720 return QualType(); 1721 1722 // C99 6.5.16p3: The type of an assignment expression is the type of the 1723 // left operand unless the left operand has qualified type, in which case 1724 // it is the unqualified version of the type of the left operand. 1725 // C99 6.5.16.1p2: In simple assignment, the value of the right operand 1726 // is converted to the type of the assignment expression (above). 1727 // C++ 5.17p1: the type of the assignment expression is that of its left 1728 // oprdu. 1729 return lhsType.getUnqualifiedType(); 1730} 1731 1732inline QualType Sema::CheckCommaOperands( // C99 6.5.17 1733 Expr *&lex, Expr *&rex, SourceLocation loc) { 1734 UsualUnaryConversions(rex); 1735 return rex->getType(); 1736} 1737 1738/// CheckIncrementDecrementOperand - unlike most "Check" methods, this routine 1739/// doesn't need to call UsualUnaryConversions or UsualArithmeticConversions. 1740QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) { 1741 QualType resType = op->getType(); 1742 assert(!resType.isNull() && "no type for increment/decrement expression"); 1743 1744 // C99 6.5.2.4p1: We allow complex as a GCC extension. 1745 if (const PointerType *pt = resType->getAsPointerType()) { 1746 if (pt->getPointeeType()->isVoidType()) { 1747 Diag(OpLoc, diag::ext_gnu_void_ptr, op->getSourceRange()); 1748 } else if (!pt->getPointeeType()->isObjectType()) { 1749 // C99 6.5.2.4p2, 6.5.6p2 1750 Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type, 1751 resType.getAsString(), op->getSourceRange()); 1752 return QualType(); 1753 } 1754 } else if (!resType->isRealType()) { 1755 if (resType->isComplexType()) 1756 // C99 does not support ++/-- on complex types. 1757 Diag(OpLoc, diag::ext_integer_increment_complex, 1758 resType.getAsString(), op->getSourceRange()); 1759 else { 1760 Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement, 1761 resType.getAsString(), op->getSourceRange()); 1762 return QualType(); 1763 } 1764 } 1765 // At this point, we know we have a real, complex or pointer type. 1766 // Now make sure the operand is a modifiable lvalue. 1767 Expr::isModifiableLvalueResult mlval = op->isModifiableLvalue(); 1768 if (mlval != Expr::MLV_Valid) { 1769 // FIXME: emit a more precise diagnostic... 1770 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_incr_decr, 1771 op->getSourceRange()); 1772 return QualType(); 1773 } 1774 return resType; 1775} 1776 1777/// getPrimaryDecl - Helper function for CheckAddressOfOperand(). 1778/// This routine allows us to typecheck complex/recursive expressions 1779/// where the declaration is needed for type checking. Here are some 1780/// examples: &s.xx, &s.zz[1].yy, &(1+2), &(XX), &"123"[2]. 1781static ValueDecl *getPrimaryDecl(Expr *E) { 1782 switch (E->getStmtClass()) { 1783 case Stmt::DeclRefExprClass: 1784 return cast<DeclRefExpr>(E)->getDecl(); 1785 case Stmt::MemberExprClass: 1786 // Fields cannot be declared with a 'register' storage class. 1787 // &X->f is always ok, even if X is declared register. 1788 if (cast<MemberExpr>(E)->isArrow()) 1789 return 0; 1790 return getPrimaryDecl(cast<MemberExpr>(E)->getBase()); 1791 case Stmt::ArraySubscriptExprClass: { 1792 // &X[4] and &4[X] is invalid if X is invalid and X is not a pointer. 1793 1794 ValueDecl *VD = getPrimaryDecl(cast<ArraySubscriptExpr>(E)->getBase()); 1795 if (!VD || VD->getType()->isPointerType()) 1796 return 0; 1797 else 1798 return VD; 1799 } 1800 case Stmt::UnaryOperatorClass: 1801 return getPrimaryDecl(cast<UnaryOperator>(E)->getSubExpr()); 1802 case Stmt::ParenExprClass: 1803 return getPrimaryDecl(cast<ParenExpr>(E)->getSubExpr()); 1804 case Stmt::ImplicitCastExprClass: 1805 // &X[4] when X is an array, has an implicit cast from array to pointer. 1806 return getPrimaryDecl(cast<ImplicitCastExpr>(E)->getSubExpr()); 1807 default: 1808 return 0; 1809 } 1810} 1811 1812/// CheckAddressOfOperand - The operand of & must be either a function 1813/// designator or an lvalue designating an object. If it is an lvalue, the 1814/// object cannot be declared with storage class register or be a bit field. 1815/// Note: The usual conversions are *not* applied to the operand of the & 1816/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue. 1817QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) { 1818 if (getLangOptions().C99) { 1819 // Implement C99-only parts of addressof rules. 1820 if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) { 1821 if (uOp->getOpcode() == UnaryOperator::Deref) 1822 // Per C99 6.5.3.2, the address of a deref always returns a valid result 1823 // (assuming the deref expression is valid). 1824 return uOp->getSubExpr()->getType(); 1825 } 1826 // Technically, there should be a check for array subscript 1827 // expressions here, but the result of one is always an lvalue anyway. 1828 } 1829 ValueDecl *dcl = getPrimaryDecl(op); 1830 Expr::isLvalueResult lval = op->isLvalue(); 1831 1832 if (lval != Expr::LV_Valid) { // C99 6.5.3.2p1 1833 if (!dcl || !isa<FunctionDecl>(dcl)) {// allow function designators 1834 // FIXME: emit more specific diag... 1835 Diag(OpLoc, diag::err_typecheck_invalid_lvalue_addrof, 1836 op->getSourceRange()); 1837 return QualType(); 1838 } 1839 } else if (MemberExpr *MemExpr = dyn_cast<MemberExpr>(op)) { // C99 6.5.3.2p1 1840 if (MemExpr->getMemberDecl()->isBitField()) { 1841 Diag(OpLoc, diag::err_typecheck_address_of, 1842 std::string("bit-field"), op->getSourceRange()); 1843 return QualType(); 1844 } 1845 // Check for Apple extension for accessing vector components. 1846 } else if (isa<ArraySubscriptExpr>(op) && 1847 cast<ArraySubscriptExpr>(op)->getBase()->getType()->isVectorType()) { 1848 Diag(OpLoc, diag::err_typecheck_address_of, 1849 std::string("vector"), op->getSourceRange()); 1850 return QualType(); 1851 } else if (dcl) { // C99 6.5.3.2p1 1852 // We have an lvalue with a decl. Make sure the decl is not declared 1853 // with the register storage-class specifier. 1854 if (const VarDecl *vd = dyn_cast<VarDecl>(dcl)) { 1855 if (vd->getStorageClass() == VarDecl::Register) { 1856 Diag(OpLoc, diag::err_typecheck_address_of, 1857 std::string("register variable"), op->getSourceRange()); 1858 return QualType(); 1859 } 1860 } else 1861 assert(0 && "Unknown/unexpected decl type"); 1862 } 1863 // If the operand has type "type", the result has type "pointer to type". 1864 return Context.getPointerType(op->getType()); 1865} 1866 1867QualType Sema::CheckIndirectionOperand(Expr *op, SourceLocation OpLoc) { 1868 UsualUnaryConversions(op); 1869 QualType qType = op->getType(); 1870 1871 if (const PointerType *PT = qType->getAsPointerType()) { 1872 // Note that per both C89 and C99, this is always legal, even 1873 // if ptype is an incomplete type or void. 1874 // It would be possible to warn about dereferencing a 1875 // void pointer, but it's completely well-defined, 1876 // and such a warning is unlikely to catch any mistakes. 1877 return PT->getPointeeType(); 1878 } 1879 Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer, 1880 qType.getAsString(), op->getSourceRange()); 1881 return QualType(); 1882} 1883 1884static inline BinaryOperator::Opcode ConvertTokenKindToBinaryOpcode( 1885 tok::TokenKind Kind) { 1886 BinaryOperator::Opcode Opc; 1887 switch (Kind) { 1888 default: assert(0 && "Unknown binop!"); 1889 case tok::star: Opc = BinaryOperator::Mul; break; 1890 case tok::slash: Opc = BinaryOperator::Div; break; 1891 case tok::percent: Opc = BinaryOperator::Rem; break; 1892 case tok::plus: Opc = BinaryOperator::Add; break; 1893 case tok::minus: Opc = BinaryOperator::Sub; break; 1894 case tok::lessless: Opc = BinaryOperator::Shl; break; 1895 case tok::greatergreater: Opc = BinaryOperator::Shr; break; 1896 case tok::lessequal: Opc = BinaryOperator::LE; break; 1897 case tok::less: Opc = BinaryOperator::LT; break; 1898 case tok::greaterequal: Opc = BinaryOperator::GE; break; 1899 case tok::greater: Opc = BinaryOperator::GT; break; 1900 case tok::exclaimequal: Opc = BinaryOperator::NE; break; 1901 case tok::equalequal: Opc = BinaryOperator::EQ; break; 1902 case tok::amp: Opc = BinaryOperator::And; break; 1903 case tok::caret: Opc = BinaryOperator::Xor; break; 1904 case tok::pipe: Opc = BinaryOperator::Or; break; 1905 case tok::ampamp: Opc = BinaryOperator::LAnd; break; 1906 case tok::pipepipe: Opc = BinaryOperator::LOr; break; 1907 case tok::equal: Opc = BinaryOperator::Assign; break; 1908 case tok::starequal: Opc = BinaryOperator::MulAssign; break; 1909 case tok::slashequal: Opc = BinaryOperator::DivAssign; break; 1910 case tok::percentequal: Opc = BinaryOperator::RemAssign; break; 1911 case tok::plusequal: Opc = BinaryOperator::AddAssign; break; 1912 case tok::minusequal: Opc = BinaryOperator::SubAssign; break; 1913 case tok::lesslessequal: Opc = BinaryOperator::ShlAssign; break; 1914 case tok::greatergreaterequal: Opc = BinaryOperator::ShrAssign; break; 1915 case tok::ampequal: Opc = BinaryOperator::AndAssign; break; 1916 case tok::caretequal: Opc = BinaryOperator::XorAssign; break; 1917 case tok::pipeequal: Opc = BinaryOperator::OrAssign; break; 1918 case tok::comma: Opc = BinaryOperator::Comma; break; 1919 } 1920 return Opc; 1921} 1922 1923static inline UnaryOperator::Opcode ConvertTokenKindToUnaryOpcode( 1924 tok::TokenKind Kind) { 1925 UnaryOperator::Opcode Opc; 1926 switch (Kind) { 1927 default: assert(0 && "Unknown unary op!"); 1928 case tok::plusplus: Opc = UnaryOperator::PreInc; break; 1929 case tok::minusminus: Opc = UnaryOperator::PreDec; break; 1930 case tok::amp: Opc = UnaryOperator::AddrOf; break; 1931 case tok::star: Opc = UnaryOperator::Deref; break; 1932 case tok::plus: Opc = UnaryOperator::Plus; break; 1933 case tok::minus: Opc = UnaryOperator::Minus; break; 1934 case tok::tilde: Opc = UnaryOperator::Not; break; 1935 case tok::exclaim: Opc = UnaryOperator::LNot; break; 1936 case tok::kw_sizeof: Opc = UnaryOperator::SizeOf; break; 1937 case tok::kw___alignof: Opc = UnaryOperator::AlignOf; break; 1938 case tok::kw___real: Opc = UnaryOperator::Real; break; 1939 case tok::kw___imag: Opc = UnaryOperator::Imag; break; 1940 case tok::kw___extension__: Opc = UnaryOperator::Extension; break; 1941 } 1942 return Opc; 1943} 1944 1945// Binary Operators. 'Tok' is the token for the operator. 1946Action::ExprResult Sema::ActOnBinOp(SourceLocation TokLoc, tok::TokenKind Kind, 1947 ExprTy *LHS, ExprTy *RHS) { 1948 BinaryOperator::Opcode Opc = ConvertTokenKindToBinaryOpcode(Kind); 1949 Expr *lhs = (Expr *)LHS, *rhs = (Expr*)RHS; 1950 1951 assert((lhs != 0) && "ActOnBinOp(): missing left expression"); 1952 assert((rhs != 0) && "ActOnBinOp(): missing right expression"); 1953 1954 QualType ResultTy; // Result type of the binary operator. 1955 QualType CompTy; // Computation type for compound assignments (e.g. '+=') 1956 1957 switch (Opc) { 1958 default: 1959 assert(0 && "Unknown binary expr!"); 1960 case BinaryOperator::Assign: 1961 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, QualType()); 1962 break; 1963 case BinaryOperator::Mul: 1964 case BinaryOperator::Div: 1965 ResultTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc); 1966 break; 1967 case BinaryOperator::Rem: 1968 ResultTy = CheckRemainderOperands(lhs, rhs, TokLoc); 1969 break; 1970 case BinaryOperator::Add: 1971 ResultTy = CheckAdditionOperands(lhs, rhs, TokLoc); 1972 break; 1973 case BinaryOperator::Sub: 1974 ResultTy = CheckSubtractionOperands(lhs, rhs, TokLoc); 1975 break; 1976 case BinaryOperator::Shl: 1977 case BinaryOperator::Shr: 1978 ResultTy = CheckShiftOperands(lhs, rhs, TokLoc); 1979 break; 1980 case BinaryOperator::LE: 1981 case BinaryOperator::LT: 1982 case BinaryOperator::GE: 1983 case BinaryOperator::GT: 1984 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, true); 1985 break; 1986 case BinaryOperator::EQ: 1987 case BinaryOperator::NE: 1988 ResultTy = CheckCompareOperands(lhs, rhs, TokLoc, false); 1989 break; 1990 case BinaryOperator::And: 1991 case BinaryOperator::Xor: 1992 case BinaryOperator::Or: 1993 ResultTy = CheckBitwiseOperands(lhs, rhs, TokLoc); 1994 break; 1995 case BinaryOperator::LAnd: 1996 case BinaryOperator::LOr: 1997 ResultTy = CheckLogicalOperands(lhs, rhs, TokLoc); 1998 break; 1999 case BinaryOperator::MulAssign: 2000 case BinaryOperator::DivAssign: 2001 CompTy = CheckMultiplyDivideOperands(lhs, rhs, TokLoc, true); 2002 if (!CompTy.isNull()) 2003 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2004 break; 2005 case BinaryOperator::RemAssign: 2006 CompTy = CheckRemainderOperands(lhs, rhs, TokLoc, true); 2007 if (!CompTy.isNull()) 2008 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2009 break; 2010 case BinaryOperator::AddAssign: 2011 CompTy = CheckAdditionOperands(lhs, rhs, TokLoc, true); 2012 if (!CompTy.isNull()) 2013 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2014 break; 2015 case BinaryOperator::SubAssign: 2016 CompTy = CheckSubtractionOperands(lhs, rhs, TokLoc, true); 2017 if (!CompTy.isNull()) 2018 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2019 break; 2020 case BinaryOperator::ShlAssign: 2021 case BinaryOperator::ShrAssign: 2022 CompTy = CheckShiftOperands(lhs, rhs, TokLoc, true); 2023 if (!CompTy.isNull()) 2024 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2025 break; 2026 case BinaryOperator::AndAssign: 2027 case BinaryOperator::XorAssign: 2028 case BinaryOperator::OrAssign: 2029 CompTy = CheckBitwiseOperands(lhs, rhs, TokLoc, true); 2030 if (!CompTy.isNull()) 2031 ResultTy = CheckAssignmentOperands(lhs, rhs, TokLoc, CompTy); 2032 break; 2033 case BinaryOperator::Comma: 2034 ResultTy = CheckCommaOperands(lhs, rhs, TokLoc); 2035 break; 2036 } 2037 if (ResultTy.isNull()) 2038 return true; 2039 if (CompTy.isNull()) 2040 return new BinaryOperator(lhs, rhs, Opc, ResultTy, TokLoc); 2041 else 2042 return new CompoundAssignOperator(lhs, rhs, Opc, ResultTy, CompTy, TokLoc); 2043} 2044 2045// Unary Operators. 'Tok' is the token for the operator. 2046Action::ExprResult Sema::ActOnUnaryOp(SourceLocation OpLoc, tok::TokenKind Op, 2047 ExprTy *input) { 2048 Expr *Input = (Expr*)input; 2049 UnaryOperator::Opcode Opc = ConvertTokenKindToUnaryOpcode(Op); 2050 QualType resultType; 2051 switch (Opc) { 2052 default: 2053 assert(0 && "Unimplemented unary expr!"); 2054 case UnaryOperator::PreInc: 2055 case UnaryOperator::PreDec: 2056 resultType = CheckIncrementDecrementOperand(Input, OpLoc); 2057 break; 2058 case UnaryOperator::AddrOf: 2059 resultType = CheckAddressOfOperand(Input, OpLoc); 2060 break; 2061 case UnaryOperator::Deref: 2062 DefaultFunctionArrayConversion(Input); 2063 resultType = CheckIndirectionOperand(Input, OpLoc); 2064 break; 2065 case UnaryOperator::Plus: 2066 case UnaryOperator::Minus: 2067 UsualUnaryConversions(Input); 2068 resultType = Input->getType(); 2069 if (!resultType->isArithmeticType()) // C99 6.5.3.3p1 2070 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2071 resultType.getAsString()); 2072 break; 2073 case UnaryOperator::Not: // bitwise complement 2074 UsualUnaryConversions(Input); 2075 resultType = Input->getType(); 2076 // C99 6.5.3.3p1. We allow complex as a GCC extension. 2077 if (!resultType->isIntegerType()) { 2078 if (resultType->isComplexType()) 2079 // C99 does not support '~' for complex conjugation. 2080 Diag(OpLoc, diag::ext_integer_complement_complex, 2081 resultType.getAsString()); 2082 else 2083 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2084 resultType.getAsString()); 2085 } 2086 break; 2087 case UnaryOperator::LNot: // logical negation 2088 // Unlike +/-/~, integer promotions aren't done here (C99 6.5.3.3p5). 2089 DefaultFunctionArrayConversion(Input); 2090 resultType = Input->getType(); 2091 if (!resultType->isScalarType()) // C99 6.5.3.3p1 2092 return Diag(OpLoc, diag::err_typecheck_unary_expr, 2093 resultType.getAsString()); 2094 // LNot always has type int. C99 6.5.3.3p5. 2095 resultType = Context.IntTy; 2096 break; 2097 case UnaryOperator::SizeOf: 2098 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, true); 2099 break; 2100 case UnaryOperator::AlignOf: 2101 resultType = CheckSizeOfAlignOfOperand(Input->getType(), OpLoc, false); 2102 break; 2103 case UnaryOperator::Real: 2104 case UnaryOperator::Imag: 2105 resultType = CheckRealImagOperand(Input, OpLoc); 2106 break; 2107 case UnaryOperator::Extension: 2108 resultType = Input->getType(); 2109 break; 2110 } 2111 if (resultType.isNull()) 2112 return true; 2113 return new UnaryOperator(Input, Opc, resultType, OpLoc); 2114} 2115 2116/// ActOnAddrLabel - Parse the GNU address of label extension: "&&foo". 2117Sema::ExprResult Sema::ActOnAddrLabel(SourceLocation OpLoc, 2118 SourceLocation LabLoc, 2119 IdentifierInfo *LabelII) { 2120 // Look up the record for this label identifier. 2121 LabelStmt *&LabelDecl = LabelMap[LabelII]; 2122 2123 // If we haven't seen this label yet, create a forward reference. 2124 if (LabelDecl == 0) 2125 LabelDecl = new LabelStmt(LabLoc, LabelII, 0); 2126 2127 // Create the AST node. The address of a label always has type 'void*'. 2128 return new AddrLabelExpr(OpLoc, LabLoc, LabelDecl, 2129 Context.getPointerType(Context.VoidTy)); 2130} 2131 2132Sema::ExprResult Sema::ActOnStmtExpr(SourceLocation LPLoc, StmtTy *substmt, 2133 SourceLocation RPLoc) { // "({..})" 2134 Stmt *SubStmt = static_cast<Stmt*>(substmt); 2135 assert(SubStmt && isa<CompoundStmt>(SubStmt) && "Invalid action invocation!"); 2136 CompoundStmt *Compound = cast<CompoundStmt>(SubStmt); 2137 2138 // FIXME: there are a variety of strange constraints to enforce here, for 2139 // example, it is not possible to goto into a stmt expression apparently. 2140 // More semantic analysis is needed. 2141 2142 // FIXME: the last statement in the compount stmt has its value used. We 2143 // should not warn about it being unused. 2144 2145 // If there are sub stmts in the compound stmt, take the type of the last one 2146 // as the type of the stmtexpr. 2147 QualType Ty = Context.VoidTy; 2148 2149 if (!Compound->body_empty()) 2150 if (Expr *LastExpr = dyn_cast<Expr>(Compound->body_back())) 2151 Ty = LastExpr->getType(); 2152 2153 return new StmtExpr(Compound, Ty, LPLoc, RPLoc); 2154} 2155 2156Sema::ExprResult Sema::ActOnBuiltinOffsetOf(SourceLocation BuiltinLoc, 2157 SourceLocation TypeLoc, 2158 TypeTy *argty, 2159 OffsetOfComponent *CompPtr, 2160 unsigned NumComponents, 2161 SourceLocation RPLoc) { 2162 QualType ArgTy = QualType::getFromOpaquePtr(argty); 2163 assert(!ArgTy.isNull() && "Missing type argument!"); 2164 2165 // We must have at least one component that refers to the type, and the first 2166 // one is known to be a field designator. Verify that the ArgTy represents 2167 // a struct/union/class. 2168 if (!ArgTy->isRecordType()) 2169 return Diag(TypeLoc, diag::err_offsetof_record_type,ArgTy.getAsString()); 2170 2171 // Otherwise, create a compound literal expression as the base, and 2172 // iteratively process the offsetof designators. 2173 Expr *Res = new CompoundLiteralExpr(SourceLocation(), ArgTy, 0, false); 2174 2175 // offsetof with non-identifier designators (e.g. "offsetof(x, a.b[c])") are a 2176 // GCC extension, diagnose them. 2177 if (NumComponents != 1) 2178 Diag(BuiltinLoc, diag::ext_offsetof_extended_field_designator, 2179 SourceRange(CompPtr[1].LocStart, CompPtr[NumComponents-1].LocEnd)); 2180 2181 for (unsigned i = 0; i != NumComponents; ++i) { 2182 const OffsetOfComponent &OC = CompPtr[i]; 2183 if (OC.isBrackets) { 2184 // Offset of an array sub-field. TODO: Should we allow vector elements? 2185 const ArrayType *AT = Res->getType()->getAsArrayType(); 2186 if (!AT) { 2187 delete Res; 2188 return Diag(OC.LocEnd, diag::err_offsetof_array_type, 2189 Res->getType().getAsString()); 2190 } 2191 2192 // FIXME: C++: Verify that operator[] isn't overloaded. 2193 2194 // C99 6.5.2.1p1 2195 Expr *Idx = static_cast<Expr*>(OC.U.E); 2196 if (!Idx->getType()->isIntegerType()) 2197 return Diag(Idx->getLocStart(), diag::err_typecheck_subscript, 2198 Idx->getSourceRange()); 2199 2200 Res = new ArraySubscriptExpr(Res, Idx, AT->getElementType(), OC.LocEnd); 2201 continue; 2202 } 2203 2204 const RecordType *RC = Res->getType()->getAsRecordType(); 2205 if (!RC) { 2206 delete Res; 2207 return Diag(OC.LocEnd, diag::err_offsetof_record_type, 2208 Res->getType().getAsString()); 2209 } 2210 2211 // Get the decl corresponding to this. 2212 RecordDecl *RD = RC->getDecl(); 2213 FieldDecl *MemberDecl = RD->getMember(OC.U.IdentInfo); 2214 if (!MemberDecl) 2215 return Diag(BuiltinLoc, diag::err_typecheck_no_member, 2216 OC.U.IdentInfo->getName(), 2217 SourceRange(OC.LocStart, OC.LocEnd)); 2218 2219 // FIXME: C++: Verify that MemberDecl isn't a static field. 2220 // FIXME: Verify that MemberDecl isn't a bitfield. 2221 // MemberDecl->getType() doesn't get the right qualifiers, but it doesn't 2222 // matter here. 2223 Res = new MemberExpr(Res, false, MemberDecl, OC.LocEnd, MemberDecl->getType()); 2224 } 2225 2226 return new UnaryOperator(Res, UnaryOperator::OffsetOf, Context.getSizeType(), 2227 BuiltinLoc); 2228} 2229 2230 2231Sema::ExprResult Sema::ActOnTypesCompatibleExpr(SourceLocation BuiltinLoc, 2232 TypeTy *arg1, TypeTy *arg2, 2233 SourceLocation RPLoc) { 2234 QualType argT1 = QualType::getFromOpaquePtr(arg1); 2235 QualType argT2 = QualType::getFromOpaquePtr(arg2); 2236 2237 assert((!argT1.isNull() && !argT2.isNull()) && "Missing type argument(s)"); 2238 2239 return new TypesCompatibleExpr(Context.IntTy, BuiltinLoc, argT1, argT2,RPLoc); 2240} 2241 2242Sema::ExprResult Sema::ActOnChooseExpr(SourceLocation BuiltinLoc, ExprTy *cond, 2243 ExprTy *expr1, ExprTy *expr2, 2244 SourceLocation RPLoc) { 2245 Expr *CondExpr = static_cast<Expr*>(cond); 2246 Expr *LHSExpr = static_cast<Expr*>(expr1); 2247 Expr *RHSExpr = static_cast<Expr*>(expr2); 2248 2249 assert((CondExpr && LHSExpr && RHSExpr) && "Missing type argument(s)"); 2250 2251 // The conditional expression is required to be a constant expression. 2252 llvm::APSInt condEval(32); 2253 SourceLocation ExpLoc; 2254 if (!CondExpr->isIntegerConstantExpr(condEval, Context, &ExpLoc)) 2255 return Diag(ExpLoc, diag::err_typecheck_choose_expr_requires_constant, 2256 CondExpr->getSourceRange()); 2257 2258 // If the condition is > zero, then the AST type is the same as the LSHExpr. 2259 QualType resType = condEval.getZExtValue() ? LHSExpr->getType() : 2260 RHSExpr->getType(); 2261 return new ChooseExpr(BuiltinLoc, CondExpr, LHSExpr, RHSExpr, resType, RPLoc); 2262} 2263 2264/// ExprsMatchFnType - return true if the Exprs in array Args have 2265/// QualTypes that match the QualTypes of the arguments of the FnType. 2266/// The number of arguments has already been validated to match the number of 2267/// arguments in FnType. 2268static bool ExprsMatchFnType(Expr **Args, const FunctionTypeProto *FnType) { 2269 unsigned NumParams = FnType->getNumArgs(); 2270 for (unsigned i = 0; i != NumParams; ++i) { 2271 QualType ExprTy = Args[i]->getType().getCanonicalType(); 2272 QualType ParmTy = FnType->getArgType(i).getCanonicalType(); 2273 2274 if (ExprTy.getUnqualifiedType() != ParmTy.getUnqualifiedType()) 2275 return false; 2276 } 2277 return true; 2278} 2279 2280Sema::ExprResult Sema::ActOnOverloadExpr(ExprTy **args, unsigned NumArgs, 2281 SourceLocation *CommaLocs, 2282 SourceLocation BuiltinLoc, 2283 SourceLocation RParenLoc) { 2284 // __builtin_overload requires at least 2 arguments 2285 if (NumArgs < 2) 2286 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2287 SourceRange(BuiltinLoc, RParenLoc)); 2288 2289 // The first argument is required to be a constant expression. It tells us 2290 // the number of arguments to pass to each of the functions to be overloaded. 2291 Expr **Args = reinterpret_cast<Expr**>(args); 2292 Expr *NParamsExpr = Args[0]; 2293 llvm::APSInt constEval(32); 2294 SourceLocation ExpLoc; 2295 if (!NParamsExpr->isIntegerConstantExpr(constEval, Context, &ExpLoc)) 2296 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2297 NParamsExpr->getSourceRange()); 2298 2299 // Verify that the number of parameters is > 0 2300 unsigned NumParams = constEval.getZExtValue(); 2301 if (NumParams == 0) 2302 return Diag(ExpLoc, diag::err_overload_expr_requires_non_zero_constant, 2303 NParamsExpr->getSourceRange()); 2304 // Verify that we have at least 1 + NumParams arguments to the builtin. 2305 if ((NumParams + 1) > NumArgs) 2306 return Diag(RParenLoc, diag::err_typecheck_call_too_few_args, 2307 SourceRange(BuiltinLoc, RParenLoc)); 2308 2309 // Figure out the return type, by matching the args to one of the functions 2310 // listed after the parameters. 2311 OverloadExpr *OE = 0; 2312 for (unsigned i = NumParams + 1; i < NumArgs; ++i) { 2313 // UsualUnaryConversions will convert the function DeclRefExpr into a 2314 // pointer to function. 2315 Expr *Fn = UsualUnaryConversions(Args[i]); 2316 FunctionTypeProto *FnType = 0; 2317 if (const PointerType *PT = Fn->getType()->getAsPointerType()) { 2318 QualType PointeeType = PT->getPointeeType().getCanonicalType(); 2319 FnType = dyn_cast<FunctionTypeProto>(PointeeType); 2320 } 2321 2322 // The Expr type must be FunctionTypeProto, since FunctionTypeProto has no 2323 // parameters, and the number of parameters must match the value passed to 2324 // the builtin. 2325 if (!FnType || (FnType->getNumArgs() != NumParams)) 2326 return Diag(Fn->getExprLoc(), diag::err_overload_incorrect_fntype, 2327 Fn->getSourceRange()); 2328 2329 // Scan the parameter list for the FunctionType, checking the QualType of 2330 // each parameter against the QualTypes of the arguments to the builtin. 2331 // If they match, return a new OverloadExpr. 2332 if (ExprsMatchFnType(Args+1, FnType)) { 2333 if (OE) 2334 return Diag(Fn->getExprLoc(), diag::err_overload_multiple_match, 2335 OE->getFn()->getSourceRange()); 2336 // Remember our match, and continue processing the remaining arguments 2337 // to catch any errors. 2338 OE = new OverloadExpr(Args, NumArgs, i, FnType->getResultType(), 2339 BuiltinLoc, RParenLoc); 2340 } 2341 } 2342 // Return the newly created OverloadExpr node, if we succeded in matching 2343 // exactly one of the candidate functions. 2344 if (OE) 2345 return OE; 2346 2347 // If we didn't find a matching function Expr in the __builtin_overload list 2348 // the return an error. 2349 std::string typeNames; 2350 for (unsigned i = 0; i != NumParams; ++i) { 2351 if (i != 0) typeNames += ", "; 2352 typeNames += Args[i+1]->getType().getAsString(); 2353 } 2354 2355 return Diag(BuiltinLoc, diag::err_overload_no_match, typeNames, 2356 SourceRange(BuiltinLoc, RParenLoc)); 2357} 2358 2359Sema::ExprResult Sema::ActOnVAArg(SourceLocation BuiltinLoc, 2360 ExprTy *expr, TypeTy *type, 2361 SourceLocation RPLoc) { 2362 Expr *E = static_cast<Expr*>(expr); 2363 QualType T = QualType::getFromOpaquePtr(type); 2364 2365 InitBuiltinVaListType(); 2366 2367 if (CheckAssignmentConstraints(Context.getBuiltinVaListType(), E->getType()) 2368 != Compatible) 2369 return Diag(E->getLocStart(), 2370 diag::err_first_argument_to_va_arg_not_of_type_va_list, 2371 E->getType().getAsString(), 2372 E->getSourceRange()); 2373 2374 // FIXME: Warn if a non-POD type is passed in. 2375 2376 return new VAArgExpr(BuiltinLoc, E, T, RPLoc); 2377} 2378 2379bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy, 2380 SourceLocation Loc, 2381 QualType DstType, QualType SrcType, 2382 Expr *SrcExpr, const char *Flavor) { 2383 // Decode the result (notice that AST's are still created for extensions). 2384 bool isInvalid = false; 2385 unsigned DiagKind; 2386 switch (ConvTy) { 2387 default: assert(0 && "Unknown conversion type"); 2388 case Compatible: return false; 2389 case PointerToInt: 2390 DiagKind = diag::ext_typecheck_convert_pointer_int; 2391 break; 2392 case IntToPointer: 2393 DiagKind = diag::ext_typecheck_convert_int_pointer; 2394 break; 2395 case IncompatiblePointer: 2396 DiagKind = diag::ext_typecheck_convert_incompatible_pointer; 2397 break; 2398 case FunctionVoidPointer: 2399 DiagKind = diag::ext_typecheck_convert_pointer_void_func; 2400 break; 2401 case CompatiblePointerDiscardsQualifiers: 2402 DiagKind = diag::ext_typecheck_convert_discards_qualifiers; 2403 break; 2404 case Incompatible: 2405 DiagKind = diag::err_typecheck_convert_incompatible; 2406 isInvalid = true; 2407 break; 2408 } 2409 2410 Diag(Loc, DiagKind, DstType.getAsString(), SrcType.getAsString(), Flavor, 2411 SrcExpr->getSourceRange()); 2412 return isInvalid; 2413} 2414 2415 2416 2417