ParseExpr.cpp revision b3e277222ac7e2148fc8ce2d5cf596231e1ee926
1//===--- ParseExpr.cpp - Expression Parsing -------------------------------===// 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/// \file 11/// \brief Provides the Expression parsing implementation. 12/// 13/// Expressions in C99 basically consist of a bunch of binary operators with 14/// unary operators and other random stuff at the leaves. 15/// 16/// In the C99 grammar, these unary operators bind tightest and are represented 17/// as the 'cast-expression' production. Everything else is either a binary 18/// operator (e.g. '/') or a ternary operator ("?:"). The unary leaves are 19/// handled by ParseCastExpression, the higher level pieces are handled by 20/// ParseBinaryExpression. 21/// 22//===----------------------------------------------------------------------===// 23 24#include "clang/Parse/Parser.h" 25#include "RAIIObjectsForParser.h" 26#include "clang/Basic/PrettyStackTrace.h" 27#include "clang/Sema/DeclSpec.h" 28#include "clang/Sema/ParsedTemplate.h" 29#include "clang/Sema/Scope.h" 30#include "clang/Sema/TypoCorrection.h" 31#include "llvm/ADT/SmallString.h" 32#include "llvm/ADT/SmallVector.h" 33using namespace clang; 34 35/// \brief Simple precedence-based parser for binary/ternary operators. 36/// 37/// Note: we diverge from the C99 grammar when parsing the assignment-expression 38/// production. C99 specifies that the LHS of an assignment operator should be 39/// parsed as a unary-expression, but consistency dictates that it be a 40/// conditional-expession. In practice, the important thing here is that the 41/// LHS of an assignment has to be an l-value, which productions between 42/// unary-expression and conditional-expression don't produce. Because we want 43/// consistency, we parse the LHS as a conditional-expression, then check for 44/// l-value-ness in semantic analysis stages. 45/// 46/// \verbatim 47/// pm-expression: [C++ 5.5] 48/// cast-expression 49/// pm-expression '.*' cast-expression 50/// pm-expression '->*' cast-expression 51/// 52/// multiplicative-expression: [C99 6.5.5] 53/// Note: in C++, apply pm-expression instead of cast-expression 54/// cast-expression 55/// multiplicative-expression '*' cast-expression 56/// multiplicative-expression '/' cast-expression 57/// multiplicative-expression '%' cast-expression 58/// 59/// additive-expression: [C99 6.5.6] 60/// multiplicative-expression 61/// additive-expression '+' multiplicative-expression 62/// additive-expression '-' multiplicative-expression 63/// 64/// shift-expression: [C99 6.5.7] 65/// additive-expression 66/// shift-expression '<<' additive-expression 67/// shift-expression '>>' additive-expression 68/// 69/// relational-expression: [C99 6.5.8] 70/// shift-expression 71/// relational-expression '<' shift-expression 72/// relational-expression '>' shift-expression 73/// relational-expression '<=' shift-expression 74/// relational-expression '>=' shift-expression 75/// 76/// equality-expression: [C99 6.5.9] 77/// relational-expression 78/// equality-expression '==' relational-expression 79/// equality-expression '!=' relational-expression 80/// 81/// AND-expression: [C99 6.5.10] 82/// equality-expression 83/// AND-expression '&' equality-expression 84/// 85/// exclusive-OR-expression: [C99 6.5.11] 86/// AND-expression 87/// exclusive-OR-expression '^' AND-expression 88/// 89/// inclusive-OR-expression: [C99 6.5.12] 90/// exclusive-OR-expression 91/// inclusive-OR-expression '|' exclusive-OR-expression 92/// 93/// logical-AND-expression: [C99 6.5.13] 94/// inclusive-OR-expression 95/// logical-AND-expression '&&' inclusive-OR-expression 96/// 97/// logical-OR-expression: [C99 6.5.14] 98/// logical-AND-expression 99/// logical-OR-expression '||' logical-AND-expression 100/// 101/// conditional-expression: [C99 6.5.15] 102/// logical-OR-expression 103/// logical-OR-expression '?' expression ':' conditional-expression 104/// [GNU] logical-OR-expression '?' ':' conditional-expression 105/// [C++] the third operand is an assignment-expression 106/// 107/// assignment-expression: [C99 6.5.16] 108/// conditional-expression 109/// unary-expression assignment-operator assignment-expression 110/// [C++] throw-expression [C++ 15] 111/// 112/// assignment-operator: one of 113/// = *= /= %= += -= <<= >>= &= ^= |= 114/// 115/// expression: [C99 6.5.17] 116/// assignment-expression ...[opt] 117/// expression ',' assignment-expression ...[opt] 118/// \endverbatim 119ExprResult Parser::ParseExpression(TypeCastState isTypeCast) { 120 ExprResult LHS(ParseAssignmentExpression(isTypeCast)); 121 return ParseRHSOfBinaryExpression(LHS, prec::Comma); 122} 123 124/// This routine is called when the '@' is seen and consumed. 125/// Current token is an Identifier and is not a 'try'. This 126/// routine is necessary to disambiguate \@try-statement from, 127/// for example, \@encode-expression. 128/// 129ExprResult 130Parser::ParseExpressionWithLeadingAt(SourceLocation AtLoc) { 131 ExprResult LHS(ParseObjCAtExpression(AtLoc)); 132 return ParseRHSOfBinaryExpression(LHS, prec::Comma); 133} 134 135/// This routine is called when a leading '__extension__' is seen and 136/// consumed. This is necessary because the token gets consumed in the 137/// process of disambiguating between an expression and a declaration. 138ExprResult 139Parser::ParseExpressionWithLeadingExtension(SourceLocation ExtLoc) { 140 ExprResult LHS(true); 141 { 142 // Silence extension warnings in the sub-expression 143 ExtensionRAIIObject O(Diags); 144 145 LHS = ParseCastExpression(false); 146 } 147 148 if (!LHS.isInvalid()) 149 LHS = Actions.ActOnUnaryOp(getCurScope(), ExtLoc, tok::kw___extension__, 150 LHS.take()); 151 152 return ParseRHSOfBinaryExpression(LHS, prec::Comma); 153} 154 155/// \brief Parse an expr that doesn't include (top-level) commas. 156ExprResult Parser::ParseAssignmentExpression(TypeCastState isTypeCast) { 157 if (Tok.is(tok::code_completion)) { 158 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 159 cutOffParsing(); 160 return ExprError(); 161 } 162 163 if (Tok.is(tok::kw_throw)) 164 return ParseThrowExpression(); 165 166 ExprResult LHS = ParseCastExpression(/*isUnaryExpression=*/false, 167 /*isAddressOfOperand=*/false, 168 isTypeCast); 169 170 // Check for a possible typo of "-" or ">" instead of "->" after a 171 // pointer to a struct or class, while recovery is still possible. 172 if (LHS.isUsable() && (Tok.is(tok::minus) || Tok.is(tok::greater))) { 173 QualType LHSType = LHS.get()->getType(); 174 const RecordType *Pointee = 175 LHSType->isPointerType() 176 ? LHSType->getPointeeType()->getAsStructureType() 177 : 0; 178 const RecordDecl *RD = Pointee ? Pointee->getDecl() : 0; 179 const Token &NextTok = NextToken(); 180 if (RD && NextTok.is(tok::identifier)) { 181 UnqualifiedId Name; 182 CXXScopeSpec ScopeSpec; 183 SourceLocation TemplateKWLoc; 184 NoTypoCorrectionCCC NoTCValidator; 185 Name.setIdentifier(NextTok.getIdentifierInfo(), NextTok.getLocation()); 186 Sema::SFINAETrap Trap(Actions); 187 ExprResult Res = 188 Actions.ActOnIdExpression(getCurScope(), ScopeSpec, TemplateKWLoc, 189 Name, false, false, &NoTCValidator); 190 if (Res.isInvalid()) { 191 Token OpTok = Tok; 192 Tok.setKind(tok::arrow); 193 PP.EnableBacktrackAtThisPos(); 194 Res = ParsePostfixExpressionSuffix(LHS); 195 if (Res.isUsable()) { 196 LHS = Res; 197 PP.CommitBacktrackedTokens(); 198 Diag(OpTok, diag::err_mistyped_arrow_in_member_access) 199 << NextTok.getIdentifierInfo() << OpTok.is(tok::greater) 200 << FixItHint::CreateReplacement(OpTok.getLocation(), "->"); 201 } else { 202 Tok = OpTok; 203 PP.Backtrack(); 204 } 205 } 206 } 207 } 208 209 return ParseRHSOfBinaryExpression(LHS, prec::Assignment); 210} 211 212/// \brief Parse an assignment expression where part of an Objective-C message 213/// send has already been parsed. 214/// 215/// In this case \p LBracLoc indicates the location of the '[' of the message 216/// send, and either \p ReceiverName or \p ReceiverExpr is non-null indicating 217/// the receiver of the message. 218/// 219/// Since this handles full assignment-expression's, it handles postfix 220/// expressions and other binary operators for these expressions as well. 221ExprResult 222Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc, 223 SourceLocation SuperLoc, 224 ParsedType ReceiverType, 225 Expr *ReceiverExpr) { 226 ExprResult R 227 = ParseObjCMessageExpressionBody(LBracLoc, SuperLoc, 228 ReceiverType, ReceiverExpr); 229 R = ParsePostfixExpressionSuffix(R); 230 return ParseRHSOfBinaryExpression(R, prec::Assignment); 231} 232 233 234ExprResult Parser::ParseConstantExpression(TypeCastState isTypeCast) { 235 // C++03 [basic.def.odr]p2: 236 // An expression is potentially evaluated unless it appears where an 237 // integral constant expression is required (see 5.19) [...]. 238 // C++98 and C++11 have no such rule, but this is only a defect in C++98. 239 EnterExpressionEvaluationContext Unevaluated(Actions, 240 Sema::ConstantEvaluated); 241 242 ExprResult LHS(ParseCastExpression(false, false, isTypeCast)); 243 ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::Conditional)); 244 return Actions.ActOnConstantExpression(Res); 245} 246 247bool Parser::isNotExpressionStart() { 248 tok::TokenKind K = Tok.getKind(); 249 if (K == tok::l_brace || K == tok::r_brace || 250 K == tok::kw_for || K == tok::kw_while || 251 K == tok::kw_if || K == tok::kw_else || 252 K == tok::kw_goto || K == tok::kw_try) 253 return true; 254 // If this is a decl-specifier, we can't be at the start of an expression. 255 return isKnownToBeDeclarationSpecifier(); 256} 257 258/// \brief Parse a binary expression that starts with \p LHS and has a 259/// precedence of at least \p MinPrec. 260ExprResult 261Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) { 262 prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(), 263 GreaterThanIsOperator, 264 getLangOpts().CPlusPlus11); 265 SourceLocation ColonLoc; 266 267 while (1) { 268 // If this token has a lower precedence than we are allowed to parse (e.g. 269 // because we are called recursively, or because the token is not a binop), 270 // then we are done! 271 if (NextTokPrec < MinPrec) 272 return LHS; 273 274 // Consume the operator, saving the operator token for error reporting. 275 Token OpToken = Tok; 276 ConsumeToken(); 277 278 // Bail out when encountering a comma followed by a token which can't 279 // possibly be the start of an expression. For instance: 280 // int f() { return 1, } 281 // We can't do this before consuming the comma, because 282 // isNotExpressionStart() looks at the token stream. 283 if (OpToken.is(tok::comma) && isNotExpressionStart()) { 284 PP.EnterToken(Tok); 285 Tok = OpToken; 286 return LHS; 287 } 288 289 // Special case handling for the ternary operator. 290 ExprResult TernaryMiddle(true); 291 if (NextTokPrec == prec::Conditional) { 292 if (Tok.isNot(tok::colon)) { 293 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 294 ColonProtectionRAIIObject X(*this); 295 296 // Handle this production specially: 297 // logical-OR-expression '?' expression ':' conditional-expression 298 // In particular, the RHS of the '?' is 'expression', not 299 // 'logical-OR-expression' as we might expect. 300 TernaryMiddle = ParseExpression(); 301 if (TernaryMiddle.isInvalid()) { 302 LHS = ExprError(); 303 TernaryMiddle = 0; 304 } 305 } else { 306 // Special case handling of "X ? Y : Z" where Y is empty: 307 // logical-OR-expression '?' ':' conditional-expression [GNU] 308 TernaryMiddle = 0; 309 Diag(Tok, diag::ext_gnu_conditional_expr); 310 } 311 312 if (Tok.is(tok::colon)) { 313 // Eat the colon. 314 ColonLoc = ConsumeToken(); 315 } else { 316 // Otherwise, we're missing a ':'. Assume that this was a typo that 317 // the user forgot. If we're not in a macro expansion, we can suggest 318 // a fixit hint. If there were two spaces before the current token, 319 // suggest inserting the colon in between them, otherwise insert ": ". 320 SourceLocation FILoc = Tok.getLocation(); 321 const char *FIText = ": "; 322 const SourceManager &SM = PP.getSourceManager(); 323 if (FILoc.isFileID() || PP.isAtStartOfMacroExpansion(FILoc, &FILoc)) { 324 assert(FILoc.isFileID()); 325 bool IsInvalid = false; 326 const char *SourcePtr = 327 SM.getCharacterData(FILoc.getLocWithOffset(-1), &IsInvalid); 328 if (!IsInvalid && *SourcePtr == ' ') { 329 SourcePtr = 330 SM.getCharacterData(FILoc.getLocWithOffset(-2), &IsInvalid); 331 if (!IsInvalid && *SourcePtr == ' ') { 332 FILoc = FILoc.getLocWithOffset(-1); 333 FIText = ":"; 334 } 335 } 336 } 337 338 Diag(Tok, diag::err_expected_colon) 339 << FixItHint::CreateInsertion(FILoc, FIText); 340 Diag(OpToken, diag::note_matching) << "?"; 341 ColonLoc = Tok.getLocation(); 342 } 343 } 344 345 // Code completion for the right-hand side of an assignment expression 346 // goes through a special hook that takes the left-hand side into account. 347 if (Tok.is(tok::code_completion) && NextTokPrec == prec::Assignment) { 348 Actions.CodeCompleteAssignmentRHS(getCurScope(), LHS.get()); 349 cutOffParsing(); 350 return ExprError(); 351 } 352 353 // Parse another leaf here for the RHS of the operator. 354 // ParseCastExpression works here because all RHS expressions in C have it 355 // as a prefix, at least. However, in C++, an assignment-expression could 356 // be a throw-expression, which is not a valid cast-expression. 357 // Therefore we need some special-casing here. 358 // Also note that the third operand of the conditional operator is 359 // an assignment-expression in C++, and in C++11, we can have a 360 // braced-init-list on the RHS of an assignment. For better diagnostics, 361 // parse as if we were allowed braced-init-lists everywhere, and check that 362 // they only appear on the RHS of assignments later. 363 ExprResult RHS; 364 bool RHSIsInitList = false; 365 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { 366 RHS = ParseBraceInitializer(); 367 RHSIsInitList = true; 368 } else if (getLangOpts().CPlusPlus && NextTokPrec <= prec::Conditional) 369 RHS = ParseAssignmentExpression(); 370 else 371 RHS = ParseCastExpression(false); 372 373 if (RHS.isInvalid()) 374 LHS = ExprError(); 375 376 // Remember the precedence of this operator and get the precedence of the 377 // operator immediately to the right of the RHS. 378 prec::Level ThisPrec = NextTokPrec; 379 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 380 getLangOpts().CPlusPlus11); 381 382 // Assignment and conditional expressions are right-associative. 383 bool isRightAssoc = ThisPrec == prec::Conditional || 384 ThisPrec == prec::Assignment; 385 386 // Get the precedence of the operator to the right of the RHS. If it binds 387 // more tightly with RHS than we do, evaluate it completely first. 388 if (ThisPrec < NextTokPrec || 389 (ThisPrec == NextTokPrec && isRightAssoc)) { 390 if (!RHS.isInvalid() && RHSIsInitList) { 391 Diag(Tok, diag::err_init_list_bin_op) 392 << /*LHS*/0 << PP.getSpelling(Tok) << Actions.getExprRange(RHS.get()); 393 RHS = ExprError(); 394 } 395 // If this is left-associative, only parse things on the RHS that bind 396 // more tightly than the current operator. If it is left-associative, it 397 // is okay, to bind exactly as tightly. For example, compile A=B=C=D as 398 // A=(B=(C=D)), where each paren is a level of recursion here. 399 // The function takes ownership of the RHS. 400 RHS = ParseRHSOfBinaryExpression(RHS, 401 static_cast<prec::Level>(ThisPrec + !isRightAssoc)); 402 RHSIsInitList = false; 403 404 if (RHS.isInvalid()) 405 LHS = ExprError(); 406 407 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 408 getLangOpts().CPlusPlus11); 409 } 410 assert(NextTokPrec <= ThisPrec && "Recursion didn't work!"); 411 412 if (!RHS.isInvalid() && RHSIsInitList) { 413 if (ThisPrec == prec::Assignment) { 414 Diag(OpToken, diag::warn_cxx98_compat_generalized_initializer_lists) 415 << Actions.getExprRange(RHS.get()); 416 } else { 417 Diag(OpToken, diag::err_init_list_bin_op) 418 << /*RHS*/1 << PP.getSpelling(OpToken) 419 << Actions.getExprRange(RHS.get()); 420 LHS = ExprError(); 421 } 422 } 423 424 if (!LHS.isInvalid()) { 425 // Combine the LHS and RHS into the LHS (e.g. build AST). 426 if (TernaryMiddle.isInvalid()) { 427 // If we're using '>>' as an operator within a template 428 // argument list (in C++98), suggest the addition of 429 // parentheses so that the code remains well-formed in C++0x. 430 if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater)) 431 SuggestParentheses(OpToken.getLocation(), 432 diag::warn_cxx11_right_shift_in_template_arg, 433 SourceRange(Actions.getExprRange(LHS.get()).getBegin(), 434 Actions.getExprRange(RHS.get()).getEnd())); 435 436 LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(), 437 OpToken.getKind(), LHS.take(), RHS.take()); 438 } else 439 LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc, 440 LHS.take(), TernaryMiddle.take(), 441 RHS.take()); 442 } 443 } 444} 445 446/// \brief Parse a cast-expression, or, if \p isUnaryExpression is true, 447/// parse a unary-expression. 448/// 449/// \p isAddressOfOperand exists because an id-expression that is the 450/// operand of address-of gets special treatment due to member pointers. 451/// 452ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 453 bool isAddressOfOperand, 454 TypeCastState isTypeCast) { 455 bool NotCastExpr; 456 ExprResult Res = ParseCastExpression(isUnaryExpression, 457 isAddressOfOperand, 458 NotCastExpr, 459 isTypeCast); 460 if (NotCastExpr) 461 Diag(Tok, diag::err_expected_expression); 462 return Res; 463} 464 465namespace { 466class CastExpressionIdValidator : public CorrectionCandidateCallback { 467 public: 468 CastExpressionIdValidator(bool AllowTypes, bool AllowNonTypes) 469 : AllowNonTypes(AllowNonTypes) { 470 WantTypeSpecifiers = AllowTypes; 471 } 472 473 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 474 NamedDecl *ND = candidate.getCorrectionDecl(); 475 if (!ND) 476 return candidate.isKeyword(); 477 478 if (isa<TypeDecl>(ND)) 479 return WantTypeSpecifiers; 480 return AllowNonTypes; 481 } 482 483 private: 484 bool AllowNonTypes; 485}; 486} 487 488/// \brief Parse a cast-expression, or, if \pisUnaryExpression is true, parse 489/// a unary-expression. 490/// 491/// \p isAddressOfOperand exists because an id-expression that is the operand 492/// of address-of gets special treatment due to member pointers. NotCastExpr 493/// is set to true if the token is not the start of a cast-expression, and no 494/// diagnostic is emitted in this case. 495/// 496/// \verbatim 497/// cast-expression: [C99 6.5.4] 498/// unary-expression 499/// '(' type-name ')' cast-expression 500/// 501/// unary-expression: [C99 6.5.3] 502/// postfix-expression 503/// '++' unary-expression 504/// '--' unary-expression 505/// unary-operator cast-expression 506/// 'sizeof' unary-expression 507/// 'sizeof' '(' type-name ')' 508/// [C++11] 'sizeof' '...' '(' identifier ')' 509/// [GNU] '__alignof' unary-expression 510/// [GNU] '__alignof' '(' type-name ')' 511/// [C11] '_Alignof' '(' type-name ')' 512/// [C++11] 'alignof' '(' type-id ')' 513/// [GNU] '&&' identifier 514/// [C++11] 'noexcept' '(' expression ')' [C++11 5.3.7] 515/// [C++] new-expression 516/// [C++] delete-expression 517/// 518/// unary-operator: one of 519/// '&' '*' '+' '-' '~' '!' 520/// [GNU] '__extension__' '__real' '__imag' 521/// 522/// primary-expression: [C99 6.5.1] 523/// [C99] identifier 524/// [C++] id-expression 525/// constant 526/// string-literal 527/// [C++] boolean-literal [C++ 2.13.5] 528/// [C++11] 'nullptr' [C++11 2.14.7] 529/// [C++11] user-defined-literal 530/// '(' expression ')' 531/// [C11] generic-selection 532/// '__func__' [C99 6.4.2.2] 533/// [GNU] '__FUNCTION__' 534/// [GNU] '__PRETTY_FUNCTION__' 535/// [GNU] '(' compound-statement ')' 536/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 537/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 538/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 539/// assign-expr ')' 540/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 541/// [GNU] '__null' 542/// [OBJC] '[' objc-message-expr ']' 543/// [OBJC] '\@selector' '(' objc-selector-arg ')' 544/// [OBJC] '\@protocol' '(' identifier ')' 545/// [OBJC] '\@encode' '(' type-name ')' 546/// [OBJC] objc-string-literal 547/// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 548/// [C++11] simple-type-specifier braced-init-list [C++11 5.2.3] 549/// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 550/// [C++11] typename-specifier braced-init-list [C++11 5.2.3] 551/// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 552/// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 553/// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 554/// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 555/// [C++] 'typeid' '(' expression ')' [C++ 5.2p1] 556/// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1] 557/// [C++] 'this' [C++ 9.3.2] 558/// [G++] unary-type-trait '(' type-id ')' 559/// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO] 560/// [EMBT] array-type-trait '(' type-id ',' integer ')' 561/// [clang] '^' block-literal 562/// 563/// constant: [C99 6.4.4] 564/// integer-constant 565/// floating-constant 566/// enumeration-constant -> identifier 567/// character-constant 568/// 569/// id-expression: [C++ 5.1] 570/// unqualified-id 571/// qualified-id 572/// 573/// unqualified-id: [C++ 5.1] 574/// identifier 575/// operator-function-id 576/// conversion-function-id 577/// '~' class-name 578/// template-id 579/// 580/// new-expression: [C++ 5.3.4] 581/// '::'[opt] 'new' new-placement[opt] new-type-id 582/// new-initializer[opt] 583/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 584/// new-initializer[opt] 585/// 586/// delete-expression: [C++ 5.3.5] 587/// '::'[opt] 'delete' cast-expression 588/// '::'[opt] 'delete' '[' ']' cast-expression 589/// 590/// [GNU/Embarcadero] unary-type-trait: 591/// '__is_arithmetic' 592/// '__is_floating_point' 593/// '__is_integral' 594/// '__is_lvalue_expr' 595/// '__is_rvalue_expr' 596/// '__is_complete_type' 597/// '__is_void' 598/// '__is_array' 599/// '__is_function' 600/// '__is_reference' 601/// '__is_lvalue_reference' 602/// '__is_rvalue_reference' 603/// '__is_fundamental' 604/// '__is_object' 605/// '__is_scalar' 606/// '__is_compound' 607/// '__is_pointer' 608/// '__is_member_object_pointer' 609/// '__is_member_function_pointer' 610/// '__is_member_pointer' 611/// '__is_const' 612/// '__is_volatile' 613/// '__is_trivial' 614/// '__is_standard_layout' 615/// '__is_signed' 616/// '__is_unsigned' 617/// 618/// [GNU] unary-type-trait: 619/// '__has_nothrow_assign' 620/// '__has_nothrow_copy' 621/// '__has_nothrow_constructor' 622/// '__has_trivial_assign' [TODO] 623/// '__has_trivial_copy' [TODO] 624/// '__has_trivial_constructor' 625/// '__has_trivial_destructor' 626/// '__has_virtual_destructor' 627/// '__is_abstract' [TODO] 628/// '__is_class' 629/// '__is_empty' [TODO] 630/// '__is_enum' 631/// '__is_final' 632/// '__is_pod' 633/// '__is_polymorphic' 634/// '__is_sealed' [MS] 635/// '__is_trivial' 636/// '__is_union' 637/// 638/// [Clang] unary-type-trait: 639/// '__trivially_copyable' 640/// 641/// binary-type-trait: 642/// [GNU] '__is_base_of' 643/// [MS] '__is_convertible_to' 644/// '__is_convertible' 645/// '__is_same' 646/// 647/// [Embarcadero] array-type-trait: 648/// '__array_rank' 649/// '__array_extent' 650/// 651/// [Embarcadero] expression-trait: 652/// '__is_lvalue_expr' 653/// '__is_rvalue_expr' 654/// \endverbatim 655/// 656ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 657 bool isAddressOfOperand, 658 bool &NotCastExpr, 659 TypeCastState isTypeCast) { 660 ExprResult Res; 661 tok::TokenKind SavedKind = Tok.getKind(); 662 NotCastExpr = false; 663 664 // This handles all of cast-expression, unary-expression, postfix-expression, 665 // and primary-expression. We handle them together like this for efficiency 666 // and to simplify handling of an expression starting with a '(' token: which 667 // may be one of a parenthesized expression, cast-expression, compound literal 668 // expression, or statement expression. 669 // 670 // If the parsed tokens consist of a primary-expression, the cases below 671 // break out of the switch; at the end we call ParsePostfixExpressionSuffix 672 // to handle the postfix expression suffixes. Cases that cannot be followed 673 // by postfix exprs should return without invoking 674 // ParsePostfixExpressionSuffix. 675 switch (SavedKind) { 676 case tok::l_paren: { 677 // If this expression is limited to being a unary-expression, the parent can 678 // not start a cast expression. 679 ParenParseOption ParenExprType = 680 (isUnaryExpression && !getLangOpts().CPlusPlus)? CompoundLiteral : CastExpr; 681 ParsedType CastTy; 682 SourceLocation RParenLoc; 683 684 { 685 // The inside of the parens don't need to be a colon protected scope, and 686 // isn't immediately a message send. 687 ColonProtectionRAIIObject X(*this, false); 688 689 Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/, 690 isTypeCast == IsTypeCast, CastTy, RParenLoc); 691 } 692 693 switch (ParenExprType) { 694 case SimpleExpr: break; // Nothing else to do. 695 case CompoundStmt: break; // Nothing else to do. 696 case CompoundLiteral: 697 // We parsed '(' type-name ')' '{' ... '}'. If any suffixes of 698 // postfix-expression exist, parse them now. 699 break; 700 case CastExpr: 701 // We have parsed the cast-expression and no postfix-expr pieces are 702 // following. 703 return Res; 704 } 705 706 break; 707 } 708 709 // primary-expression 710 case tok::numeric_constant: 711 // constant: integer-constant 712 // constant: floating-constant 713 714 Res = Actions.ActOnNumericConstant(Tok, /*UDLScope*/getCurScope()); 715 ConsumeToken(); 716 break; 717 718 case tok::kw_true: 719 case tok::kw_false: 720 return ParseCXXBoolLiteral(); 721 722 case tok::kw___objc_yes: 723 case tok::kw___objc_no: 724 return ParseObjCBoolLiteral(); 725 726 case tok::kw_nullptr: 727 Diag(Tok, diag::warn_cxx98_compat_nullptr); 728 return Actions.ActOnCXXNullPtrLiteral(ConsumeToken()); 729 730 case tok::annot_primary_expr: 731 assert(Res.get() == 0 && "Stray primary-expression annotation?"); 732 Res = getExprAnnotation(Tok); 733 ConsumeToken(); 734 break; 735 736 case tok::kw_decltype: 737 // Annotate the token and tail recurse. 738 if (TryAnnotateTypeOrScopeToken()) 739 return ExprError(); 740 assert(Tok.isNot(tok::kw_decltype)); 741 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 742 743 case tok::identifier: { // primary-expression: identifier 744 // unqualified-id: identifier 745 // constant: enumeration-constant 746 // Turn a potentially qualified name into a annot_typename or 747 // annot_cxxscope if it would be valid. This handles things like x::y, etc. 748 if (getLangOpts().CPlusPlus) { 749 // Avoid the unnecessary parse-time lookup in the common case 750 // where the syntax forbids a type. 751 const Token &Next = NextToken(); 752 753 // If this identifier was reverted from a token ID, and the next token 754 // is a parenthesis, this is likely to be a use of a type trait. Check 755 // those tokens. 756 if (Next.is(tok::l_paren) && 757 Tok.is(tok::identifier) && 758 Tok.getIdentifierInfo()->hasRevertedTokenIDToIdentifier()) { 759 IdentifierInfo *II = Tok.getIdentifierInfo(); 760 // Build up the mapping of revertable type traits, for future use. 761 if (RevertableTypeTraits.empty()) { 762#define RTT_JOIN(X,Y) X##Y 763#define REVERTABLE_TYPE_TRAIT(Name) \ 764 RevertableTypeTraits[PP.getIdentifierInfo(#Name)] \ 765 = RTT_JOIN(tok::kw_,Name) 766 767 REVERTABLE_TYPE_TRAIT(__is_arithmetic); 768 REVERTABLE_TYPE_TRAIT(__is_convertible); 769 REVERTABLE_TYPE_TRAIT(__is_empty); 770 REVERTABLE_TYPE_TRAIT(__is_floating_point); 771 REVERTABLE_TYPE_TRAIT(__is_function); 772 REVERTABLE_TYPE_TRAIT(__is_fundamental); 773 REVERTABLE_TYPE_TRAIT(__is_integral); 774 REVERTABLE_TYPE_TRAIT(__is_member_function_pointer); 775 REVERTABLE_TYPE_TRAIT(__is_member_pointer); 776 REVERTABLE_TYPE_TRAIT(__is_pod); 777 REVERTABLE_TYPE_TRAIT(__is_pointer); 778 REVERTABLE_TYPE_TRAIT(__is_same); 779 REVERTABLE_TYPE_TRAIT(__is_scalar); 780 REVERTABLE_TYPE_TRAIT(__is_signed); 781 REVERTABLE_TYPE_TRAIT(__is_unsigned); 782 REVERTABLE_TYPE_TRAIT(__is_void); 783#undef REVERTABLE_TYPE_TRAIT 784#undef RTT_JOIN 785 } 786 787 // If we find that this is in fact the name of a type trait, 788 // update the token kind in place and parse again to treat it as 789 // the appropriate kind of type trait. 790 llvm::SmallDenseMap<IdentifierInfo *, tok::TokenKind>::iterator Known 791 = RevertableTypeTraits.find(II); 792 if (Known != RevertableTypeTraits.end()) { 793 Tok.setKind(Known->second); 794 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 795 NotCastExpr, isTypeCast); 796 } 797 } 798 799 if (Next.is(tok::coloncolon) || 800 (!ColonIsSacred && Next.is(tok::colon)) || 801 Next.is(tok::less) || 802 Next.is(tok::l_paren) || 803 Next.is(tok::l_brace)) { 804 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 805 if (TryAnnotateTypeOrScopeToken()) 806 return ExprError(); 807 if (!Tok.is(tok::identifier)) 808 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 809 } 810 } 811 812 // Consume the identifier so that we can see if it is followed by a '(' or 813 // '.'. 814 IdentifierInfo &II = *Tok.getIdentifierInfo(); 815 SourceLocation ILoc = ConsumeToken(); 816 817 // Support 'Class.property' and 'super.property' notation. 818 if (getLangOpts().ObjC1 && Tok.is(tok::period) && 819 (Actions.getTypeName(II, ILoc, getCurScope()) || 820 // Allow the base to be 'super' if in an objc-method. 821 (&II == Ident_super && getCurScope()->isInObjcMethodScope()))) { 822 ConsumeToken(); 823 824 // Allow either an identifier or the keyword 'class' (in C++). 825 if (Tok.isNot(tok::identifier) && 826 !(getLangOpts().CPlusPlus && Tok.is(tok::kw_class))) { 827 Diag(Tok, diag::err_expected_property_name); 828 return ExprError(); 829 } 830 IdentifierInfo &PropertyName = *Tok.getIdentifierInfo(); 831 SourceLocation PropertyLoc = ConsumeToken(); 832 833 Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName, 834 ILoc, PropertyLoc); 835 break; 836 } 837 838 // In an Objective-C method, if we have "super" followed by an identifier, 839 // the token sequence is ill-formed. However, if there's a ':' or ']' after 840 // that identifier, this is probably a message send with a missing open 841 // bracket. Treat it as such. 842 if (getLangOpts().ObjC1 && &II == Ident_super && !InMessageExpression && 843 getCurScope()->isInObjcMethodScope() && 844 ((Tok.is(tok::identifier) && 845 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) || 846 Tok.is(tok::code_completion))) { 847 Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, ParsedType(), 848 0); 849 break; 850 } 851 852 // If we have an Objective-C class name followed by an identifier 853 // and either ':' or ']', this is an Objective-C class message 854 // send that's missing the opening '['. Recovery 855 // appropriately. Also take this path if we're performing code 856 // completion after an Objective-C class name. 857 if (getLangOpts().ObjC1 && 858 ((Tok.is(tok::identifier) && !InMessageExpression) || 859 Tok.is(tok::code_completion))) { 860 const Token& Next = NextToken(); 861 if (Tok.is(tok::code_completion) || 862 Next.is(tok::colon) || Next.is(tok::r_square)) 863 if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope())) 864 if (Typ.get()->isObjCObjectOrInterfaceType()) { 865 // Fake up a Declarator to use with ActOnTypeName. 866 DeclSpec DS(AttrFactory); 867 DS.SetRangeStart(ILoc); 868 DS.SetRangeEnd(ILoc); 869 const char *PrevSpec = 0; 870 unsigned DiagID; 871 DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ); 872 873 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 874 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), 875 DeclaratorInfo); 876 if (Ty.isInvalid()) 877 break; 878 879 Res = ParseObjCMessageExpressionBody(SourceLocation(), 880 SourceLocation(), 881 Ty.get(), 0); 882 break; 883 } 884 } 885 886 // Make sure to pass down the right value for isAddressOfOperand. 887 if (isAddressOfOperand && isPostfixExpressionSuffixStart()) 888 isAddressOfOperand = false; 889 890 // Function designators are allowed to be undeclared (C99 6.5.1p2), so we 891 // need to know whether or not this identifier is a function designator or 892 // not. 893 UnqualifiedId Name; 894 CXXScopeSpec ScopeSpec; 895 SourceLocation TemplateKWLoc; 896 CastExpressionIdValidator Validator(isTypeCast != NotTypeCast, 897 isTypeCast != IsTypeCast); 898 Name.setIdentifier(&II, ILoc); 899 Res = Actions.ActOnIdExpression(getCurScope(), ScopeSpec, TemplateKWLoc, 900 Name, Tok.is(tok::l_paren), 901 isAddressOfOperand, &Validator); 902 break; 903 } 904 case tok::char_constant: // constant: character-constant 905 case tok::wide_char_constant: 906 case tok::utf16_char_constant: 907 case tok::utf32_char_constant: 908 Res = Actions.ActOnCharacterConstant(Tok, /*UDLScope*/getCurScope()); 909 ConsumeToken(); 910 break; 911 case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2] 912 case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU] 913 case tok::kw_L__FUNCTION__: // primary-expression: L__FUNCTION__ [MS] 914 case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU] 915 Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind); 916 ConsumeToken(); 917 break; 918 case tok::string_literal: // primary-expression: string-literal 919 case tok::wide_string_literal: 920 case tok::utf8_string_literal: 921 case tok::utf16_string_literal: 922 case tok::utf32_string_literal: 923 Res = ParseStringLiteralExpression(true); 924 break; 925 case tok::kw__Generic: // primary-expression: generic-selection [C11 6.5.1] 926 Res = ParseGenericSelectionExpression(); 927 break; 928 case tok::kw___builtin_va_arg: 929 case tok::kw___builtin_offsetof: 930 case tok::kw___builtin_choose_expr: 931 case tok::kw___builtin_astype: // primary-expression: [OCL] as_type() 932 case tok::kw___builtin_convertvector: 933 return ParseBuiltinPrimaryExpression(); 934 case tok::kw___null: 935 return Actions.ActOnGNUNullExpr(ConsumeToken()); 936 937 case tok::plusplus: // unary-expression: '++' unary-expression [C99] 938 case tok::minusminus: { // unary-expression: '--' unary-expression [C99] 939 // C++ [expr.unary] has: 940 // unary-expression: 941 // ++ cast-expression 942 // -- cast-expression 943 SourceLocation SavedLoc = ConsumeToken(); 944 Res = ParseCastExpression(!getLangOpts().CPlusPlus); 945 if (!Res.isInvalid()) 946 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 947 return Res; 948 } 949 case tok::amp: { // unary-expression: '&' cast-expression 950 // Special treatment because of member pointers 951 SourceLocation SavedLoc = ConsumeToken(); 952 Res = ParseCastExpression(false, true); 953 if (!Res.isInvalid()) 954 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 955 return Res; 956 } 957 958 case tok::star: // unary-expression: '*' cast-expression 959 case tok::plus: // unary-expression: '+' cast-expression 960 case tok::minus: // unary-expression: '-' cast-expression 961 case tok::tilde: // unary-expression: '~' cast-expression 962 case tok::exclaim: // unary-expression: '!' cast-expression 963 case tok::kw___real: // unary-expression: '__real' cast-expression [GNU] 964 case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU] 965 SourceLocation SavedLoc = ConsumeToken(); 966 Res = ParseCastExpression(false); 967 if (!Res.isInvalid()) 968 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 969 return Res; 970 } 971 972 case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU] 973 // __extension__ silences extension warnings in the subexpression. 974 ExtensionRAIIObject O(Diags); // Use RAII to do this. 975 SourceLocation SavedLoc = ConsumeToken(); 976 Res = ParseCastExpression(false); 977 if (!Res.isInvalid()) 978 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 979 return Res; 980 } 981 case tok::kw__Alignof: // unary-expression: '_Alignof' '(' type-name ')' 982 if (!getLangOpts().C11) 983 Diag(Tok, diag::ext_c11_alignment) << Tok.getName(); 984 // fallthrough 985 case tok::kw_alignof: // unary-expression: 'alignof' '(' type-id ')' 986 case tok::kw___alignof: // unary-expression: '__alignof' unary-expression 987 // unary-expression: '__alignof' '(' type-name ')' 988 case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression 989 // unary-expression: 'sizeof' '(' type-name ')' 990 case tok::kw_vec_step: // unary-expression: OpenCL 'vec_step' expression 991 return ParseUnaryExprOrTypeTraitExpression(); 992 case tok::ampamp: { // unary-expression: '&&' identifier 993 SourceLocation AmpAmpLoc = ConsumeToken(); 994 if (Tok.isNot(tok::identifier)) 995 return ExprError(Diag(Tok, diag::err_expected_ident)); 996 997 if (getCurScope()->getFnParent() == 0) 998 return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn)); 999 1000 Diag(AmpAmpLoc, diag::ext_gnu_address_of_label); 1001 LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(), 1002 Tok.getLocation()); 1003 Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD); 1004 ConsumeToken(); 1005 return Res; 1006 } 1007 case tok::kw_const_cast: 1008 case tok::kw_dynamic_cast: 1009 case tok::kw_reinterpret_cast: 1010 case tok::kw_static_cast: 1011 Res = ParseCXXCasts(); 1012 break; 1013 case tok::kw_typeid: 1014 Res = ParseCXXTypeid(); 1015 break; 1016 case tok::kw___uuidof: 1017 Res = ParseCXXUuidof(); 1018 break; 1019 case tok::kw_this: 1020 Res = ParseCXXThis(); 1021 break; 1022 1023 case tok::annot_typename: 1024 if (isStartOfObjCClassMessageMissingOpenBracket()) { 1025 ParsedType Type = getTypeAnnotation(Tok); 1026 1027 // Fake up a Declarator to use with ActOnTypeName. 1028 DeclSpec DS(AttrFactory); 1029 DS.SetRangeStart(Tok.getLocation()); 1030 DS.SetRangeEnd(Tok.getLastLoc()); 1031 1032 const char *PrevSpec = 0; 1033 unsigned DiagID; 1034 DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(), 1035 PrevSpec, DiagID, Type); 1036 1037 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 1038 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 1039 if (Ty.isInvalid()) 1040 break; 1041 1042 ConsumeToken(); 1043 Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 1044 Ty.get(), 0); 1045 break; 1046 } 1047 // Fall through 1048 1049 case tok::annot_decltype: 1050 case tok::kw_char: 1051 case tok::kw_wchar_t: 1052 case tok::kw_char16_t: 1053 case tok::kw_char32_t: 1054 case tok::kw_bool: 1055 case tok::kw_short: 1056 case tok::kw_int: 1057 case tok::kw_long: 1058 case tok::kw___int64: 1059 case tok::kw___int128: 1060 case tok::kw_signed: 1061 case tok::kw_unsigned: 1062 case tok::kw_half: 1063 case tok::kw_float: 1064 case tok::kw_double: 1065 case tok::kw_void: 1066 case tok::kw_typename: 1067 case tok::kw_typeof: 1068 case tok::kw___vector: 1069 case tok::kw_image1d_t: 1070 case tok::kw_image1d_array_t: 1071 case tok::kw_image1d_buffer_t: 1072 case tok::kw_image2d_t: 1073 case tok::kw_image2d_array_t: 1074 case tok::kw_image3d_t: 1075 case tok::kw_sampler_t: 1076 case tok::kw_event_t: { 1077 if (!getLangOpts().CPlusPlus) { 1078 Diag(Tok, diag::err_expected_expression); 1079 return ExprError(); 1080 } 1081 1082 if (SavedKind == tok::kw_typename) { 1083 // postfix-expression: typename-specifier '(' expression-list[opt] ')' 1084 // typename-specifier braced-init-list 1085 if (TryAnnotateTypeOrScopeToken()) 1086 return ExprError(); 1087 1088 if (!Actions.isSimpleTypeSpecifier(Tok.getKind())) 1089 // We are trying to parse a simple-type-specifier but might not get such 1090 // a token after error recovery. 1091 return ExprError(); 1092 } 1093 1094 // postfix-expression: simple-type-specifier '(' expression-list[opt] ')' 1095 // simple-type-specifier braced-init-list 1096 // 1097 DeclSpec DS(AttrFactory); 1098 1099 ParseCXXSimpleTypeSpecifier(DS); 1100 if (Tok.isNot(tok::l_paren) && 1101 (!getLangOpts().CPlusPlus11 || Tok.isNot(tok::l_brace))) 1102 return ExprError(Diag(Tok, diag::err_expected_lparen_after_type) 1103 << DS.getSourceRange()); 1104 1105 if (Tok.is(tok::l_brace)) 1106 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 1107 1108 Res = ParseCXXTypeConstructExpression(DS); 1109 break; 1110 } 1111 1112 case tok::annot_cxxscope: { // [C++] id-expression: qualified-id 1113 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 1114 // (We can end up in this situation after tentative parsing.) 1115 if (TryAnnotateTypeOrScopeToken()) 1116 return ExprError(); 1117 if (!Tok.is(tok::annot_cxxscope)) 1118 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1119 NotCastExpr, isTypeCast); 1120 1121 Token Next = NextToken(); 1122 if (Next.is(tok::annot_template_id)) { 1123 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next); 1124 if (TemplateId->Kind == TNK_Type_template) { 1125 // We have a qualified template-id that we know refers to a 1126 // type, translate it into a type and continue parsing as a 1127 // cast expression. 1128 CXXScopeSpec SS; 1129 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), 1130 /*EnteringContext=*/false); 1131 AnnotateTemplateIdTokenAsType(); 1132 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1133 NotCastExpr, isTypeCast); 1134 } 1135 } 1136 1137 // Parse as an id-expression. 1138 Res = ParseCXXIdExpression(isAddressOfOperand); 1139 break; 1140 } 1141 1142 case tok::annot_template_id: { // [C++] template-id 1143 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 1144 if (TemplateId->Kind == TNK_Type_template) { 1145 // We have a template-id that we know refers to a type, 1146 // translate it into a type and continue parsing as a cast 1147 // expression. 1148 AnnotateTemplateIdTokenAsType(); 1149 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1150 NotCastExpr, isTypeCast); 1151 } 1152 1153 // Fall through to treat the template-id as an id-expression. 1154 } 1155 1156 case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id 1157 Res = ParseCXXIdExpression(isAddressOfOperand); 1158 break; 1159 1160 case tok::coloncolon: { 1161 // ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken 1162 // annotates the token, tail recurse. 1163 if (TryAnnotateTypeOrScopeToken()) 1164 return ExprError(); 1165 if (!Tok.is(tok::coloncolon)) 1166 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 1167 1168 // ::new -> [C++] new-expression 1169 // ::delete -> [C++] delete-expression 1170 SourceLocation CCLoc = ConsumeToken(); 1171 if (Tok.is(tok::kw_new)) 1172 return ParseCXXNewExpression(true, CCLoc); 1173 if (Tok.is(tok::kw_delete)) 1174 return ParseCXXDeleteExpression(true, CCLoc); 1175 1176 // This is not a type name or scope specifier, it is an invalid expression. 1177 Diag(CCLoc, diag::err_expected_expression); 1178 return ExprError(); 1179 } 1180 1181 case tok::kw_new: // [C++] new-expression 1182 return ParseCXXNewExpression(false, Tok.getLocation()); 1183 1184 case tok::kw_delete: // [C++] delete-expression 1185 return ParseCXXDeleteExpression(false, Tok.getLocation()); 1186 1187 case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')' 1188 Diag(Tok, diag::warn_cxx98_compat_noexcept_expr); 1189 SourceLocation KeyLoc = ConsumeToken(); 1190 BalancedDelimiterTracker T(*this, tok::l_paren); 1191 1192 if (T.expectAndConsume(diag::err_expected_lparen_after, "noexcept")) 1193 return ExprError(); 1194 // C++11 [expr.unary.noexcept]p1: 1195 // The noexcept operator determines whether the evaluation of its operand, 1196 // which is an unevaluated operand, can throw an exception. 1197 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 1198 ExprResult Result = ParseExpression(); 1199 1200 T.consumeClose(); 1201 1202 if (!Result.isInvalid()) 1203 Result = Actions.ActOnNoexceptExpr(KeyLoc, T.getOpenLocation(), 1204 Result.take(), T.getCloseLocation()); 1205 return Result; 1206 } 1207 1208 case tok::kw___is_abstract: // [GNU] unary-type-trait 1209 case tok::kw___is_class: 1210 case tok::kw___is_empty: 1211 case tok::kw___is_enum: 1212 case tok::kw___is_interface_class: 1213 case tok::kw___is_literal: 1214 case tok::kw___is_arithmetic: 1215 case tok::kw___is_integral: 1216 case tok::kw___is_floating_point: 1217 case tok::kw___is_complete_type: 1218 case tok::kw___is_void: 1219 case tok::kw___is_array: 1220 case tok::kw___is_function: 1221 case tok::kw___is_reference: 1222 case tok::kw___is_lvalue_reference: 1223 case tok::kw___is_rvalue_reference: 1224 case tok::kw___is_fundamental: 1225 case tok::kw___is_object: 1226 case tok::kw___is_scalar: 1227 case tok::kw___is_compound: 1228 case tok::kw___is_pointer: 1229 case tok::kw___is_member_object_pointer: 1230 case tok::kw___is_member_function_pointer: 1231 case tok::kw___is_member_pointer: 1232 case tok::kw___is_const: 1233 case tok::kw___is_volatile: 1234 case tok::kw___is_standard_layout: 1235 case tok::kw___is_signed: 1236 case tok::kw___is_unsigned: 1237 case tok::kw___is_literal_type: 1238 case tok::kw___is_pod: 1239 case tok::kw___is_polymorphic: 1240 case tok::kw___is_trivial: 1241 case tok::kw___is_trivially_copyable: 1242 case tok::kw___is_union: 1243 case tok::kw___is_final: 1244 case tok::kw___is_sealed: 1245 case tok::kw___has_trivial_constructor: 1246 case tok::kw___has_trivial_move_constructor: 1247 case tok::kw___has_trivial_copy: 1248 case tok::kw___has_trivial_assign: 1249 case tok::kw___has_trivial_move_assign: 1250 case tok::kw___has_trivial_destructor: 1251 case tok::kw___has_nothrow_assign: 1252 case tok::kw___has_nothrow_move_assign: 1253 case tok::kw___has_nothrow_copy: 1254 case tok::kw___has_nothrow_constructor: 1255 case tok::kw___has_virtual_destructor: 1256 return ParseUnaryTypeTrait(); 1257 1258 case tok::kw___builtin_types_compatible_p: 1259 case tok::kw___is_base_of: 1260 case tok::kw___is_same: 1261 case tok::kw___is_convertible: 1262 case tok::kw___is_convertible_to: 1263 case tok::kw___is_trivially_assignable: 1264 return ParseBinaryTypeTrait(); 1265 1266 case tok::kw___is_trivially_constructible: 1267 return ParseTypeTrait(); 1268 1269 case tok::kw___array_rank: 1270 case tok::kw___array_extent: 1271 return ParseArrayTypeTrait(); 1272 1273 case tok::kw___is_lvalue_expr: 1274 case tok::kw___is_rvalue_expr: 1275 return ParseExpressionTrait(); 1276 1277 case tok::at: { 1278 SourceLocation AtLoc = ConsumeToken(); 1279 return ParseObjCAtExpression(AtLoc); 1280 } 1281 case tok::caret: 1282 Res = ParseBlockLiteralExpression(); 1283 break; 1284 case tok::code_completion: { 1285 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 1286 cutOffParsing(); 1287 return ExprError(); 1288 } 1289 case tok::l_square: 1290 if (getLangOpts().CPlusPlus11) { 1291 if (getLangOpts().ObjC1) { 1292 // C++11 lambda expressions and Objective-C message sends both start with a 1293 // square bracket. There are three possibilities here: 1294 // we have a valid lambda expression, we have an invalid lambda 1295 // expression, or we have something that doesn't appear to be a lambda. 1296 // If we're in the last case, we fall back to ParseObjCMessageExpression. 1297 Res = TryParseLambdaExpression(); 1298 if (!Res.isInvalid() && !Res.get()) 1299 Res = ParseObjCMessageExpression(); 1300 break; 1301 } 1302 Res = ParseLambdaExpression(); 1303 break; 1304 } 1305 if (getLangOpts().ObjC1) { 1306 Res = ParseObjCMessageExpression(); 1307 break; 1308 } 1309 // FALL THROUGH. 1310 default: 1311 NotCastExpr = true; 1312 return ExprError(); 1313 } 1314 1315 // These can be followed by postfix-expr pieces. 1316 return ParsePostfixExpressionSuffix(Res); 1317} 1318 1319/// \brief Once the leading part of a postfix-expression is parsed, this 1320/// method parses any suffixes that apply. 1321/// 1322/// \verbatim 1323/// postfix-expression: [C99 6.5.2] 1324/// primary-expression 1325/// postfix-expression '[' expression ']' 1326/// postfix-expression '[' braced-init-list ']' 1327/// postfix-expression '(' argument-expression-list[opt] ')' 1328/// postfix-expression '.' identifier 1329/// postfix-expression '->' identifier 1330/// postfix-expression '++' 1331/// postfix-expression '--' 1332/// '(' type-name ')' '{' initializer-list '}' 1333/// '(' type-name ')' '{' initializer-list ',' '}' 1334/// 1335/// argument-expression-list: [C99 6.5.2] 1336/// argument-expression ...[opt] 1337/// argument-expression-list ',' assignment-expression ...[opt] 1338/// \endverbatim 1339ExprResult 1340Parser::ParsePostfixExpressionSuffix(ExprResult LHS) { 1341 // Now that the primary-expression piece of the postfix-expression has been 1342 // parsed, see if there are any postfix-expression pieces here. 1343 SourceLocation Loc; 1344 while (1) { 1345 switch (Tok.getKind()) { 1346 case tok::code_completion: 1347 if (InMessageExpression) 1348 return LHS; 1349 1350 Actions.CodeCompletePostfixExpression(getCurScope(), LHS); 1351 cutOffParsing(); 1352 return ExprError(); 1353 1354 case tok::identifier: 1355 // If we see identifier: after an expression, and we're not already in a 1356 // message send, then this is probably a message send with a missing 1357 // opening bracket '['. 1358 if (getLangOpts().ObjC1 && !InMessageExpression && 1359 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) { 1360 LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 1361 ParsedType(), LHS.get()); 1362 break; 1363 } 1364 1365 // Fall through; this isn't a message send. 1366 1367 default: // Not a postfix-expression suffix. 1368 return LHS; 1369 case tok::l_square: { // postfix-expression: p-e '[' expression ']' 1370 // If we have a array postfix expression that starts on a new line and 1371 // Objective-C is enabled, it is highly likely that the user forgot a 1372 // semicolon after the base expression and that the array postfix-expr is 1373 // actually another message send. In this case, do some look-ahead to see 1374 // if the contents of the square brackets are obviously not a valid 1375 // expression and recover by pretending there is no suffix. 1376 if (getLangOpts().ObjC1 && Tok.isAtStartOfLine() && 1377 isSimpleObjCMessageExpression()) 1378 return LHS; 1379 1380 // Reject array indices starting with a lambda-expression. '[[' is 1381 // reserved for attributes. 1382 if (CheckProhibitedCXX11Attribute()) 1383 return ExprError(); 1384 1385 BalancedDelimiterTracker T(*this, tok::l_square); 1386 T.consumeOpen(); 1387 Loc = T.getOpenLocation(); 1388 ExprResult Idx; 1389 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { 1390 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 1391 Idx = ParseBraceInitializer(); 1392 } else 1393 Idx = ParseExpression(); 1394 1395 SourceLocation RLoc = Tok.getLocation(); 1396 1397 if (!LHS.isInvalid() && !Idx.isInvalid() && Tok.is(tok::r_square)) { 1398 LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.take(), Loc, 1399 Idx.take(), RLoc); 1400 } else 1401 LHS = ExprError(); 1402 1403 // Match the ']'. 1404 T.consumeClose(); 1405 break; 1406 } 1407 1408 case tok::l_paren: // p-e: p-e '(' argument-expression-list[opt] ')' 1409 case tok::lesslessless: { // p-e: p-e '<<<' argument-expression-list '>>>' 1410 // '(' argument-expression-list[opt] ')' 1411 tok::TokenKind OpKind = Tok.getKind(); 1412 InMessageExpressionRAIIObject InMessage(*this, false); 1413 1414 Expr *ExecConfig = 0; 1415 1416 BalancedDelimiterTracker PT(*this, tok::l_paren); 1417 1418 if (OpKind == tok::lesslessless) { 1419 ExprVector ExecConfigExprs; 1420 CommaLocsTy ExecConfigCommaLocs; 1421 SourceLocation OpenLoc = ConsumeToken(); 1422 1423 if (ParseSimpleExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) { 1424 LHS = ExprError(); 1425 } 1426 1427 SourceLocation CloseLoc = Tok.getLocation(); 1428 if (Tok.is(tok::greatergreatergreater)) { 1429 ConsumeToken(); 1430 } else if (LHS.isInvalid()) { 1431 SkipUntil(tok::greatergreatergreater); 1432 } else { 1433 // There was an error closing the brackets 1434 Diag(Tok, diag::err_expected_ggg); 1435 Diag(OpenLoc, diag::note_matching) << "<<<"; 1436 SkipUntil(tok::greatergreatergreater); 1437 LHS = ExprError(); 1438 } 1439 1440 if (!LHS.isInvalid()) { 1441 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen, "")) 1442 LHS = ExprError(); 1443 else 1444 Loc = PrevTokLocation; 1445 } 1446 1447 if (!LHS.isInvalid()) { 1448 ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(), 1449 OpenLoc, 1450 ExecConfigExprs, 1451 CloseLoc); 1452 if (ECResult.isInvalid()) 1453 LHS = ExprError(); 1454 else 1455 ExecConfig = ECResult.get(); 1456 } 1457 } else { 1458 PT.consumeOpen(); 1459 Loc = PT.getOpenLocation(); 1460 } 1461 1462 ExprVector ArgExprs; 1463 CommaLocsTy CommaLocs; 1464 1465 if (Tok.is(tok::code_completion)) { 1466 Actions.CodeCompleteCall(getCurScope(), LHS.get(), None); 1467 cutOffParsing(); 1468 return ExprError(); 1469 } 1470 1471 if (OpKind == tok::l_paren || !LHS.isInvalid()) { 1472 if (Tok.isNot(tok::r_paren)) { 1473 if (ParseExpressionList(ArgExprs, CommaLocs, &Sema::CodeCompleteCall, 1474 LHS.get())) { 1475 LHS = ExprError(); 1476 } 1477 } 1478 } 1479 1480 // Match the ')'. 1481 if (LHS.isInvalid()) { 1482 SkipUntil(tok::r_paren); 1483 } else if (Tok.isNot(tok::r_paren)) { 1484 PT.consumeClose(); 1485 LHS = ExprError(); 1486 } else { 1487 assert((ArgExprs.size() == 0 || 1488 ArgExprs.size()-1 == CommaLocs.size())&& 1489 "Unexpected number of commas!"); 1490 LHS = Actions.ActOnCallExpr(getCurScope(), LHS.take(), Loc, 1491 ArgExprs, Tok.getLocation(), 1492 ExecConfig); 1493 PT.consumeClose(); 1494 } 1495 1496 break; 1497 } 1498 case tok::arrow: 1499 case tok::period: { 1500 // postfix-expression: p-e '->' template[opt] id-expression 1501 // postfix-expression: p-e '.' template[opt] id-expression 1502 tok::TokenKind OpKind = Tok.getKind(); 1503 SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token. 1504 1505 CXXScopeSpec SS; 1506 ParsedType ObjectType; 1507 bool MayBePseudoDestructor = false; 1508 if (getLangOpts().CPlusPlus && !LHS.isInvalid()) { 1509 Expr *Base = LHS.take(); 1510 const Type* BaseType = Base->getType().getTypePtrOrNull(); 1511 if (BaseType && Tok.is(tok::l_paren) && 1512 (BaseType->isFunctionType() || 1513 BaseType->isSpecificPlaceholderType(BuiltinType::BoundMember))) { 1514 Diag(OpLoc, diag::err_function_is_not_record) 1515 << (OpKind == tok::arrow) << Base->getSourceRange() 1516 << FixItHint::CreateRemoval(OpLoc); 1517 return ParsePostfixExpressionSuffix(Base); 1518 } 1519 1520 LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), Base, 1521 OpLoc, OpKind, ObjectType, 1522 MayBePseudoDestructor); 1523 if (LHS.isInvalid()) 1524 break; 1525 1526 ParseOptionalCXXScopeSpecifier(SS, ObjectType, 1527 /*EnteringContext=*/false, 1528 &MayBePseudoDestructor); 1529 if (SS.isNotEmpty()) 1530 ObjectType = ParsedType(); 1531 } 1532 1533 if (Tok.is(tok::code_completion)) { 1534 // Code completion for a member access expression. 1535 Actions.CodeCompleteMemberReferenceExpr(getCurScope(), LHS.get(), 1536 OpLoc, OpKind == tok::arrow); 1537 1538 cutOffParsing(); 1539 return ExprError(); 1540 } 1541 1542 if (MayBePseudoDestructor && !LHS.isInvalid()) { 1543 LHS = ParseCXXPseudoDestructor(LHS.take(), OpLoc, OpKind, SS, 1544 ObjectType); 1545 break; 1546 } 1547 1548 // Either the action has told is that this cannot be a 1549 // pseudo-destructor expression (based on the type of base 1550 // expression), or we didn't see a '~' in the right place. We 1551 // can still parse a destructor name here, but in that case it 1552 // names a real destructor. 1553 // Allow explicit constructor calls in Microsoft mode. 1554 // FIXME: Add support for explicit call of template constructor. 1555 SourceLocation TemplateKWLoc; 1556 UnqualifiedId Name; 1557 if (getLangOpts().ObjC2 && OpKind == tok::period && Tok.is(tok::kw_class)) { 1558 // Objective-C++: 1559 // After a '.' in a member access expression, treat the keyword 1560 // 'class' as if it were an identifier. 1561 // 1562 // This hack allows property access to the 'class' method because it is 1563 // such a common method name. For other C++ keywords that are 1564 // Objective-C method names, one must use the message send syntax. 1565 IdentifierInfo *Id = Tok.getIdentifierInfo(); 1566 SourceLocation Loc = ConsumeToken(); 1567 Name.setIdentifier(Id, Loc); 1568 } else if (ParseUnqualifiedId(SS, 1569 /*EnteringContext=*/false, 1570 /*AllowDestructorName=*/true, 1571 /*AllowConstructorName=*/ 1572 getLangOpts().MicrosoftExt, 1573 ObjectType, TemplateKWLoc, Name)) 1574 LHS = ExprError(); 1575 1576 if (!LHS.isInvalid()) 1577 LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.take(), OpLoc, 1578 OpKind, SS, TemplateKWLoc, Name, 1579 CurParsedObjCImpl ? CurParsedObjCImpl->Dcl : 0, 1580 Tok.is(tok::l_paren)); 1581 break; 1582 } 1583 case tok::plusplus: // postfix-expression: postfix-expression '++' 1584 case tok::minusminus: // postfix-expression: postfix-expression '--' 1585 if (!LHS.isInvalid()) { 1586 LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(), 1587 Tok.getKind(), LHS.take()); 1588 } 1589 ConsumeToken(); 1590 break; 1591 } 1592 } 1593} 1594 1595/// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/ 1596/// vec_step and we are at the start of an expression or a parenthesized 1597/// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the 1598/// expression (isCastExpr == false) or the type (isCastExpr == true). 1599/// 1600/// \verbatim 1601/// unary-expression: [C99 6.5.3] 1602/// 'sizeof' unary-expression 1603/// 'sizeof' '(' type-name ')' 1604/// [GNU] '__alignof' unary-expression 1605/// [GNU] '__alignof' '(' type-name ')' 1606/// [C11] '_Alignof' '(' type-name ')' 1607/// [C++0x] 'alignof' '(' type-id ')' 1608/// 1609/// [GNU] typeof-specifier: 1610/// typeof ( expressions ) 1611/// typeof ( type-name ) 1612/// [GNU/C++] typeof unary-expression 1613/// 1614/// [OpenCL 1.1 6.11.12] vec_step built-in function: 1615/// vec_step ( expressions ) 1616/// vec_step ( type-name ) 1617/// \endverbatim 1618ExprResult 1619Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok, 1620 bool &isCastExpr, 1621 ParsedType &CastTy, 1622 SourceRange &CastRange) { 1623 1624 assert((OpTok.is(tok::kw_typeof) || OpTok.is(tok::kw_sizeof) || 1625 OpTok.is(tok::kw___alignof) || OpTok.is(tok::kw_alignof) || 1626 OpTok.is(tok::kw__Alignof) || OpTok.is(tok::kw_vec_step)) && 1627 "Not a typeof/sizeof/alignof/vec_step expression!"); 1628 1629 ExprResult Operand; 1630 1631 // If the operand doesn't start with an '(', it must be an expression. 1632 if (Tok.isNot(tok::l_paren)) { 1633 // If construct allows a form without parenthesis, user may forget to put 1634 // pathenthesis around type name. 1635 if (OpTok.is(tok::kw_sizeof) || OpTok.is(tok::kw___alignof) || 1636 OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof)) { 1637 bool isAmbiguousTypeId; 1638 if (isTypeIdInParens(isAmbiguousTypeId)) { 1639 DeclSpec DS(AttrFactory); 1640 ParseSpecifierQualifierList(DS); 1641 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 1642 ParseDeclarator(DeclaratorInfo); 1643 1644 SourceLocation LParenLoc = PP.getLocForEndOfToken(OpTok.getLocation()); 1645 SourceLocation RParenLoc = PP.getLocForEndOfToken(PrevTokLocation); 1646 Diag(LParenLoc, diag::err_expected_parentheses_around_typename) 1647 << OpTok.getName() 1648 << FixItHint::CreateInsertion(LParenLoc, "(") 1649 << FixItHint::CreateInsertion(RParenLoc, ")"); 1650 isCastExpr = true; 1651 return ExprEmpty(); 1652 } 1653 } 1654 1655 isCastExpr = false; 1656 if (OpTok.is(tok::kw_typeof) && !getLangOpts().CPlusPlus) { 1657 Diag(Tok,diag::err_expected_lparen_after_id) << OpTok.getIdentifierInfo(); 1658 return ExprError(); 1659 } 1660 1661 Operand = ParseCastExpression(true/*isUnaryExpression*/); 1662 } else { 1663 // If it starts with a '(', we know that it is either a parenthesized 1664 // type-name, or it is a unary-expression that starts with a compound 1665 // literal, or starts with a primary-expression that is a parenthesized 1666 // expression. 1667 ParenParseOption ExprType = CastExpr; 1668 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc; 1669 1670 Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/, 1671 false, CastTy, RParenLoc); 1672 CastRange = SourceRange(LParenLoc, RParenLoc); 1673 1674 // If ParseParenExpression parsed a '(typename)' sequence only, then this is 1675 // a type. 1676 if (ExprType == CastExpr) { 1677 isCastExpr = true; 1678 return ExprEmpty(); 1679 } 1680 1681 if (getLangOpts().CPlusPlus || OpTok.isNot(tok::kw_typeof)) { 1682 // GNU typeof in C requires the expression to be parenthesized. Not so for 1683 // sizeof/alignof or in C++. Therefore, the parenthesized expression is 1684 // the start of a unary-expression, but doesn't include any postfix 1685 // pieces. Parse these now if present. 1686 if (!Operand.isInvalid()) 1687 Operand = ParsePostfixExpressionSuffix(Operand.get()); 1688 } 1689 } 1690 1691 // If we get here, the operand to the typeof/sizeof/alignof was an expresion. 1692 isCastExpr = false; 1693 return Operand; 1694} 1695 1696 1697/// \brief Parse a sizeof or alignof expression. 1698/// 1699/// \verbatim 1700/// unary-expression: [C99 6.5.3] 1701/// 'sizeof' unary-expression 1702/// 'sizeof' '(' type-name ')' 1703/// [C++11] 'sizeof' '...' '(' identifier ')' 1704/// [GNU] '__alignof' unary-expression 1705/// [GNU] '__alignof' '(' type-name ')' 1706/// [C11] '_Alignof' '(' type-name ')' 1707/// [C++11] 'alignof' '(' type-id ')' 1708/// \endverbatim 1709ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() { 1710 assert((Tok.is(tok::kw_sizeof) || Tok.is(tok::kw___alignof) || 1711 Tok.is(tok::kw_alignof) || Tok.is(tok::kw__Alignof) || 1712 Tok.is(tok::kw_vec_step)) && 1713 "Not a sizeof/alignof/vec_step expression!"); 1714 Token OpTok = Tok; 1715 ConsumeToken(); 1716 1717 // [C++11] 'sizeof' '...' '(' identifier ')' 1718 if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) { 1719 SourceLocation EllipsisLoc = ConsumeToken(); 1720 SourceLocation LParenLoc, RParenLoc; 1721 IdentifierInfo *Name = 0; 1722 SourceLocation NameLoc; 1723 if (Tok.is(tok::l_paren)) { 1724 BalancedDelimiterTracker T(*this, tok::l_paren); 1725 T.consumeOpen(); 1726 LParenLoc = T.getOpenLocation(); 1727 if (Tok.is(tok::identifier)) { 1728 Name = Tok.getIdentifierInfo(); 1729 NameLoc = ConsumeToken(); 1730 T.consumeClose(); 1731 RParenLoc = T.getCloseLocation(); 1732 if (RParenLoc.isInvalid()) 1733 RParenLoc = PP.getLocForEndOfToken(NameLoc); 1734 } else { 1735 Diag(Tok, diag::err_expected_parameter_pack); 1736 SkipUntil(tok::r_paren); 1737 } 1738 } else if (Tok.is(tok::identifier)) { 1739 Name = Tok.getIdentifierInfo(); 1740 NameLoc = ConsumeToken(); 1741 LParenLoc = PP.getLocForEndOfToken(EllipsisLoc); 1742 RParenLoc = PP.getLocForEndOfToken(NameLoc); 1743 Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack) 1744 << Name 1745 << FixItHint::CreateInsertion(LParenLoc, "(") 1746 << FixItHint::CreateInsertion(RParenLoc, ")"); 1747 } else { 1748 Diag(Tok, diag::err_sizeof_parameter_pack); 1749 } 1750 1751 if (!Name) 1752 return ExprError(); 1753 1754 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated, 1755 Sema::ReuseLambdaContextDecl); 1756 1757 return Actions.ActOnSizeofParameterPackExpr(getCurScope(), 1758 OpTok.getLocation(), 1759 *Name, NameLoc, 1760 RParenLoc); 1761 } 1762 1763 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof)) 1764 Diag(OpTok, diag::warn_cxx98_compat_alignof); 1765 1766 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated, 1767 Sema::ReuseLambdaContextDecl); 1768 1769 bool isCastExpr; 1770 ParsedType CastTy; 1771 SourceRange CastRange; 1772 ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok, 1773 isCastExpr, 1774 CastTy, 1775 CastRange); 1776 1777 UnaryExprOrTypeTrait ExprKind = UETT_SizeOf; 1778 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw___alignof) || 1779 OpTok.is(tok::kw__Alignof)) 1780 ExprKind = UETT_AlignOf; 1781 else if (OpTok.is(tok::kw_vec_step)) 1782 ExprKind = UETT_VecStep; 1783 1784 if (isCastExpr) 1785 return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(), 1786 ExprKind, 1787 /*isType=*/true, 1788 CastTy.getAsOpaquePtr(), 1789 CastRange); 1790 1791 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof)) 1792 Diag(OpTok, diag::ext_alignof_expr) << OpTok.getIdentifierInfo(); 1793 1794 // If we get here, the operand to the sizeof/alignof was an expresion. 1795 if (!Operand.isInvalid()) 1796 Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(), 1797 ExprKind, 1798 /*isType=*/false, 1799 Operand.release(), 1800 CastRange); 1801 return Operand; 1802} 1803 1804/// ParseBuiltinPrimaryExpression 1805/// 1806/// \verbatim 1807/// primary-expression: [C99 6.5.1] 1808/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 1809/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 1810/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 1811/// assign-expr ')' 1812/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 1813/// [OCL] '__builtin_astype' '(' assignment-expression ',' type-name ')' 1814/// 1815/// [GNU] offsetof-member-designator: 1816/// [GNU] identifier 1817/// [GNU] offsetof-member-designator '.' identifier 1818/// [GNU] offsetof-member-designator '[' expression ']' 1819/// \endverbatim 1820ExprResult Parser::ParseBuiltinPrimaryExpression() { 1821 ExprResult Res; 1822 const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo(); 1823 1824 tok::TokenKind T = Tok.getKind(); 1825 SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier. 1826 1827 // All of these start with an open paren. 1828 if (Tok.isNot(tok::l_paren)) 1829 return ExprError(Diag(Tok, diag::err_expected_lparen_after_id) 1830 << BuiltinII); 1831 1832 BalancedDelimiterTracker PT(*this, tok::l_paren); 1833 PT.consumeOpen(); 1834 1835 // TODO: Build AST. 1836 1837 switch (T) { 1838 default: llvm_unreachable("Not a builtin primary expression!"); 1839 case tok::kw___builtin_va_arg: { 1840 ExprResult Expr(ParseAssignmentExpression()); 1841 1842 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1843 Expr = ExprError(); 1844 1845 TypeResult Ty = ParseTypeName(); 1846 1847 if (Tok.isNot(tok::r_paren)) { 1848 Diag(Tok, diag::err_expected_rparen); 1849 Expr = ExprError(); 1850 } 1851 1852 if (Expr.isInvalid() || Ty.isInvalid()) 1853 Res = ExprError(); 1854 else 1855 Res = Actions.ActOnVAArg(StartLoc, Expr.take(), Ty.get(), ConsumeParen()); 1856 break; 1857 } 1858 case tok::kw___builtin_offsetof: { 1859 SourceLocation TypeLoc = Tok.getLocation(); 1860 TypeResult Ty = ParseTypeName(); 1861 if (Ty.isInvalid()) { 1862 SkipUntil(tok::r_paren); 1863 return ExprError(); 1864 } 1865 1866 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1867 return ExprError(); 1868 1869 // We must have at least one identifier here. 1870 if (Tok.isNot(tok::identifier)) { 1871 Diag(Tok, diag::err_expected_ident); 1872 SkipUntil(tok::r_paren); 1873 return ExprError(); 1874 } 1875 1876 // Keep track of the various subcomponents we see. 1877 SmallVector<Sema::OffsetOfComponent, 4> Comps; 1878 1879 Comps.push_back(Sema::OffsetOfComponent()); 1880 Comps.back().isBrackets = false; 1881 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1882 Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken(); 1883 1884 // FIXME: This loop leaks the index expressions on error. 1885 while (1) { 1886 if (Tok.is(tok::period)) { 1887 // offsetof-member-designator: offsetof-member-designator '.' identifier 1888 Comps.push_back(Sema::OffsetOfComponent()); 1889 Comps.back().isBrackets = false; 1890 Comps.back().LocStart = ConsumeToken(); 1891 1892 if (Tok.isNot(tok::identifier)) { 1893 Diag(Tok, diag::err_expected_ident); 1894 SkipUntil(tok::r_paren); 1895 return ExprError(); 1896 } 1897 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1898 Comps.back().LocEnd = ConsumeToken(); 1899 1900 } else if (Tok.is(tok::l_square)) { 1901 if (CheckProhibitedCXX11Attribute()) 1902 return ExprError(); 1903 1904 // offsetof-member-designator: offsetof-member-design '[' expression ']' 1905 Comps.push_back(Sema::OffsetOfComponent()); 1906 Comps.back().isBrackets = true; 1907 BalancedDelimiterTracker ST(*this, tok::l_square); 1908 ST.consumeOpen(); 1909 Comps.back().LocStart = ST.getOpenLocation(); 1910 Res = ParseExpression(); 1911 if (Res.isInvalid()) { 1912 SkipUntil(tok::r_paren); 1913 return Res; 1914 } 1915 Comps.back().U.E = Res.release(); 1916 1917 ST.consumeClose(); 1918 Comps.back().LocEnd = ST.getCloseLocation(); 1919 } else { 1920 if (Tok.isNot(tok::r_paren)) { 1921 PT.consumeClose(); 1922 Res = ExprError(); 1923 } else if (Ty.isInvalid()) { 1924 Res = ExprError(); 1925 } else { 1926 PT.consumeClose(); 1927 Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc, 1928 Ty.get(), &Comps[0], Comps.size(), 1929 PT.getCloseLocation()); 1930 } 1931 break; 1932 } 1933 } 1934 break; 1935 } 1936 case tok::kw___builtin_choose_expr: { 1937 ExprResult Cond(ParseAssignmentExpression()); 1938 if (Cond.isInvalid()) { 1939 SkipUntil(tok::r_paren); 1940 return Cond; 1941 } 1942 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1943 return ExprError(); 1944 1945 ExprResult Expr1(ParseAssignmentExpression()); 1946 if (Expr1.isInvalid()) { 1947 SkipUntil(tok::r_paren); 1948 return Expr1; 1949 } 1950 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1951 return ExprError(); 1952 1953 ExprResult Expr2(ParseAssignmentExpression()); 1954 if (Expr2.isInvalid()) { 1955 SkipUntil(tok::r_paren); 1956 return Expr2; 1957 } 1958 if (Tok.isNot(tok::r_paren)) { 1959 Diag(Tok, diag::err_expected_rparen); 1960 return ExprError(); 1961 } 1962 Res = Actions.ActOnChooseExpr(StartLoc, Cond.take(), Expr1.take(), 1963 Expr2.take(), ConsumeParen()); 1964 break; 1965 } 1966 case tok::kw___builtin_astype: { 1967 // The first argument is an expression to be converted, followed by a comma. 1968 ExprResult Expr(ParseAssignmentExpression()); 1969 if (Expr.isInvalid()) { 1970 SkipUntil(tok::r_paren); 1971 return ExprError(); 1972 } 1973 1974 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", 1975 tok::r_paren)) 1976 return ExprError(); 1977 1978 // Second argument is the type to bitcast to. 1979 TypeResult DestTy = ParseTypeName(); 1980 if (DestTy.isInvalid()) 1981 return ExprError(); 1982 1983 // Attempt to consume the r-paren. 1984 if (Tok.isNot(tok::r_paren)) { 1985 Diag(Tok, diag::err_expected_rparen); 1986 SkipUntil(tok::r_paren); 1987 return ExprError(); 1988 } 1989 1990 Res = Actions.ActOnAsTypeExpr(Expr.take(), DestTy.get(), StartLoc, 1991 ConsumeParen()); 1992 break; 1993 } 1994 case tok::kw___builtin_convertvector: { 1995 // The first argument is an expression to be converted, followed by a comma. 1996 ExprResult Expr(ParseAssignmentExpression()); 1997 if (Expr.isInvalid()) { 1998 SkipUntil(tok::r_paren); 1999 return ExprError(); 2000 } 2001 2002 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", 2003 tok::r_paren)) 2004 return ExprError(); 2005 2006 // Second argument is the type to bitcast to. 2007 TypeResult DestTy = ParseTypeName(); 2008 if (DestTy.isInvalid()) 2009 return ExprError(); 2010 2011 // Attempt to consume the r-paren. 2012 if (Tok.isNot(tok::r_paren)) { 2013 Diag(Tok, diag::err_expected_rparen); 2014 SkipUntil(tok::r_paren); 2015 return ExprError(); 2016 } 2017 2018 Res = Actions.ActOnConvertVectorExpr(Expr.take(), DestTy.get(), StartLoc, 2019 ConsumeParen()); 2020 break; 2021 } 2022 } 2023 2024 if (Res.isInvalid()) 2025 return ExprError(); 2026 2027 // These can be followed by postfix-expr pieces because they are 2028 // primary-expressions. 2029 return ParsePostfixExpressionSuffix(Res.take()); 2030} 2031 2032/// ParseParenExpression - This parses the unit that starts with a '(' token, 2033/// based on what is allowed by ExprType. The actual thing parsed is returned 2034/// in ExprType. If stopIfCastExpr is true, it will only return the parsed type, 2035/// not the parsed cast-expression. 2036/// 2037/// \verbatim 2038/// primary-expression: [C99 6.5.1] 2039/// '(' expression ')' 2040/// [GNU] '(' compound-statement ')' (if !ParenExprOnly) 2041/// postfix-expression: [C99 6.5.2] 2042/// '(' type-name ')' '{' initializer-list '}' 2043/// '(' type-name ')' '{' initializer-list ',' '}' 2044/// cast-expression: [C99 6.5.4] 2045/// '(' type-name ')' cast-expression 2046/// [ARC] bridged-cast-expression 2047/// 2048/// [ARC] bridged-cast-expression: 2049/// (__bridge type-name) cast-expression 2050/// (__bridge_transfer type-name) cast-expression 2051/// (__bridge_retained type-name) cast-expression 2052/// \endverbatim 2053ExprResult 2054Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr, 2055 bool isTypeCast, ParsedType &CastTy, 2056 SourceLocation &RParenLoc) { 2057 assert(Tok.is(tok::l_paren) && "Not a paren expr!"); 2058 BalancedDelimiterTracker T(*this, tok::l_paren); 2059 if (T.consumeOpen()) 2060 return ExprError(); 2061 SourceLocation OpenLoc = T.getOpenLocation(); 2062 2063 ExprResult Result(true); 2064 bool isAmbiguousTypeId; 2065 CastTy = ParsedType(); 2066 2067 if (Tok.is(tok::code_completion)) { 2068 Actions.CodeCompleteOrdinaryName(getCurScope(), 2069 ExprType >= CompoundLiteral? Sema::PCC_ParenthesizedExpression 2070 : Sema::PCC_Expression); 2071 cutOffParsing(); 2072 return ExprError(); 2073 } 2074 2075 // Diagnose use of bridge casts in non-arc mode. 2076 bool BridgeCast = (getLangOpts().ObjC2 && 2077 (Tok.is(tok::kw___bridge) || 2078 Tok.is(tok::kw___bridge_transfer) || 2079 Tok.is(tok::kw___bridge_retained) || 2080 Tok.is(tok::kw___bridge_retain))); 2081 if (BridgeCast && !getLangOpts().ObjCAutoRefCount) { 2082 if (Tok.isNot(tok::kw___bridge)) { 2083 StringRef BridgeCastName = Tok.getName(); 2084 SourceLocation BridgeKeywordLoc = ConsumeToken(); 2085 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc)) 2086 Diag(BridgeKeywordLoc, diag::warn_arc_bridge_cast_nonarc) 2087 << BridgeCastName 2088 << FixItHint::CreateReplacement(BridgeKeywordLoc, ""); 2089 } 2090 else 2091 ConsumeToken(); // consume __bridge 2092 BridgeCast = false; 2093 } 2094 2095 // None of these cases should fall through with an invalid Result 2096 // unless they've already reported an error. 2097 if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) { 2098 Diag(Tok, diag::ext_gnu_statement_expr); 2099 Actions.ActOnStartStmtExpr(); 2100 2101 StmtResult Stmt(ParseCompoundStatement(true)); 2102 ExprType = CompoundStmt; 2103 2104 // If the substmt parsed correctly, build the AST node. 2105 if (!Stmt.isInvalid()) { 2106 Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.take(), Tok.getLocation()); 2107 } else { 2108 Actions.ActOnStmtExprError(); 2109 } 2110 } else if (ExprType >= CompoundLiteral && BridgeCast) { 2111 tok::TokenKind tokenKind = Tok.getKind(); 2112 SourceLocation BridgeKeywordLoc = ConsumeToken(); 2113 2114 // Parse an Objective-C ARC ownership cast expression. 2115 ObjCBridgeCastKind Kind; 2116 if (tokenKind == tok::kw___bridge) 2117 Kind = OBC_Bridge; 2118 else if (tokenKind == tok::kw___bridge_transfer) 2119 Kind = OBC_BridgeTransfer; 2120 else if (tokenKind == tok::kw___bridge_retained) 2121 Kind = OBC_BridgeRetained; 2122 else { 2123 // As a hopefully temporary workaround, allow __bridge_retain as 2124 // a synonym for __bridge_retained, but only in system headers. 2125 assert(tokenKind == tok::kw___bridge_retain); 2126 Kind = OBC_BridgeRetained; 2127 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc)) 2128 Diag(BridgeKeywordLoc, diag::err_arc_bridge_retain) 2129 << FixItHint::CreateReplacement(BridgeKeywordLoc, 2130 "__bridge_retained"); 2131 } 2132 2133 TypeResult Ty = ParseTypeName(); 2134 T.consumeClose(); 2135 RParenLoc = T.getCloseLocation(); 2136 ExprResult SubExpr = ParseCastExpression(/*isUnaryExpression=*/false); 2137 2138 if (Ty.isInvalid() || SubExpr.isInvalid()) 2139 return ExprError(); 2140 2141 return Actions.ActOnObjCBridgedCast(getCurScope(), OpenLoc, Kind, 2142 BridgeKeywordLoc, Ty.get(), 2143 RParenLoc, SubExpr.get()); 2144 } else if (ExprType >= CompoundLiteral && 2145 isTypeIdInParens(isAmbiguousTypeId)) { 2146 2147 // Otherwise, this is a compound literal expression or cast expression. 2148 2149 // In C++, if the type-id is ambiguous we disambiguate based on context. 2150 // If stopIfCastExpr is true the context is a typeof/sizeof/alignof 2151 // in which case we should treat it as type-id. 2152 // if stopIfCastExpr is false, we need to determine the context past the 2153 // parens, so we defer to ParseCXXAmbiguousParenExpression for that. 2154 if (isAmbiguousTypeId && !stopIfCastExpr) { 2155 ExprResult res = ParseCXXAmbiguousParenExpression(ExprType, CastTy, T); 2156 RParenLoc = T.getCloseLocation(); 2157 return res; 2158 } 2159 2160 // Parse the type declarator. 2161 DeclSpec DS(AttrFactory); 2162 ParseSpecifierQualifierList(DS); 2163 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 2164 ParseDeclarator(DeclaratorInfo); 2165 2166 // If our type is followed by an identifier and either ':' or ']', then 2167 // this is probably an Objective-C message send where the leading '[' is 2168 // missing. Recover as if that were the case. 2169 if (!DeclaratorInfo.isInvalidType() && Tok.is(tok::identifier) && 2170 !InMessageExpression && getLangOpts().ObjC1 && 2171 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) { 2172 TypeResult Ty; 2173 { 2174 InMessageExpressionRAIIObject InMessage(*this, false); 2175 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 2176 } 2177 Result = ParseObjCMessageExpressionBody(SourceLocation(), 2178 SourceLocation(), 2179 Ty.get(), 0); 2180 } else { 2181 // Match the ')'. 2182 T.consumeClose(); 2183 RParenLoc = T.getCloseLocation(); 2184 if (Tok.is(tok::l_brace)) { 2185 ExprType = CompoundLiteral; 2186 TypeResult Ty; 2187 { 2188 InMessageExpressionRAIIObject InMessage(*this, false); 2189 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 2190 } 2191 return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc); 2192 } 2193 2194 if (ExprType == CastExpr) { 2195 // We parsed '(' type-name ')' and the thing after it wasn't a '{'. 2196 2197 if (DeclaratorInfo.isInvalidType()) 2198 return ExprError(); 2199 2200 // Note that this doesn't parse the subsequent cast-expression, it just 2201 // returns the parsed type to the callee. 2202 if (stopIfCastExpr) { 2203 TypeResult Ty; 2204 { 2205 InMessageExpressionRAIIObject InMessage(*this, false); 2206 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 2207 } 2208 CastTy = Ty.get(); 2209 return ExprResult(); 2210 } 2211 2212 // Reject the cast of super idiom in ObjC. 2213 if (Tok.is(tok::identifier) && getLangOpts().ObjC1 && 2214 Tok.getIdentifierInfo() == Ident_super && 2215 getCurScope()->isInObjcMethodScope() && 2216 GetLookAheadToken(1).isNot(tok::period)) { 2217 Diag(Tok.getLocation(), diag::err_illegal_super_cast) 2218 << SourceRange(OpenLoc, RParenLoc); 2219 return ExprError(); 2220 } 2221 2222 // Parse the cast-expression that follows it next. 2223 // TODO: For cast expression with CastTy. 2224 Result = ParseCastExpression(/*isUnaryExpression=*/false, 2225 /*isAddressOfOperand=*/false, 2226 /*isTypeCast=*/IsTypeCast); 2227 if (!Result.isInvalid()) { 2228 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc, 2229 DeclaratorInfo, CastTy, 2230 RParenLoc, Result.take()); 2231 } 2232 return Result; 2233 } 2234 2235 Diag(Tok, diag::err_expected_lbrace_in_compound_literal); 2236 return ExprError(); 2237 } 2238 } else if (isTypeCast) { 2239 // Parse the expression-list. 2240 InMessageExpressionRAIIObject InMessage(*this, false); 2241 2242 ExprVector ArgExprs; 2243 CommaLocsTy CommaLocs; 2244 2245 if (!ParseSimpleExpressionList(ArgExprs, CommaLocs)) { 2246 ExprType = SimpleExpr; 2247 Result = Actions.ActOnParenListExpr(OpenLoc, Tok.getLocation(), 2248 ArgExprs); 2249 } 2250 } else { 2251 InMessageExpressionRAIIObject InMessage(*this, false); 2252 2253 Result = ParseExpression(MaybeTypeCast); 2254 ExprType = SimpleExpr; 2255 2256 // Don't build a paren expression unless we actually match a ')'. 2257 if (!Result.isInvalid() && Tok.is(tok::r_paren)) 2258 Result = Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.take()); 2259 } 2260 2261 // Match the ')'. 2262 if (Result.isInvalid()) { 2263 SkipUntil(tok::r_paren); 2264 return ExprError(); 2265 } 2266 2267 T.consumeClose(); 2268 RParenLoc = T.getCloseLocation(); 2269 return Result; 2270} 2271 2272/// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name 2273/// and we are at the left brace. 2274/// 2275/// \verbatim 2276/// postfix-expression: [C99 6.5.2] 2277/// '(' type-name ')' '{' initializer-list '}' 2278/// '(' type-name ')' '{' initializer-list ',' '}' 2279/// \endverbatim 2280ExprResult 2281Parser::ParseCompoundLiteralExpression(ParsedType Ty, 2282 SourceLocation LParenLoc, 2283 SourceLocation RParenLoc) { 2284 assert(Tok.is(tok::l_brace) && "Not a compound literal!"); 2285 if (!getLangOpts().C99) // Compound literals don't exist in C90. 2286 Diag(LParenLoc, diag::ext_c99_compound_literal); 2287 ExprResult Result = ParseInitializer(); 2288 if (!Result.isInvalid() && Ty) 2289 return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.take()); 2290 return Result; 2291} 2292 2293/// ParseStringLiteralExpression - This handles the various token types that 2294/// form string literals, and also handles string concatenation [C99 5.1.1.2, 2295/// translation phase #6]. 2296/// 2297/// \verbatim 2298/// primary-expression: [C99 6.5.1] 2299/// string-literal 2300/// \verbatim 2301ExprResult Parser::ParseStringLiteralExpression(bool AllowUserDefinedLiteral) { 2302 assert(isTokenStringLiteral() && "Not a string literal!"); 2303 2304 // String concat. Note that keywords like __func__ and __FUNCTION__ are not 2305 // considered to be strings for concatenation purposes. 2306 SmallVector<Token, 4> StringToks; 2307 2308 do { 2309 StringToks.push_back(Tok); 2310 ConsumeStringToken(); 2311 } while (isTokenStringLiteral()); 2312 2313 // Pass the set of string tokens, ready for concatenation, to the actions. 2314 return Actions.ActOnStringLiteral(&StringToks[0], StringToks.size(), 2315 AllowUserDefinedLiteral ? getCurScope() : 0); 2316} 2317 2318/// ParseGenericSelectionExpression - Parse a C11 generic-selection 2319/// [C11 6.5.1.1]. 2320/// 2321/// \verbatim 2322/// generic-selection: 2323/// _Generic ( assignment-expression , generic-assoc-list ) 2324/// generic-assoc-list: 2325/// generic-association 2326/// generic-assoc-list , generic-association 2327/// generic-association: 2328/// type-name : assignment-expression 2329/// default : assignment-expression 2330/// \endverbatim 2331ExprResult Parser::ParseGenericSelectionExpression() { 2332 assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected"); 2333 SourceLocation KeyLoc = ConsumeToken(); 2334 2335 if (!getLangOpts().C11) 2336 Diag(KeyLoc, diag::ext_c11_generic_selection); 2337 2338 BalancedDelimiterTracker T(*this, tok::l_paren); 2339 if (T.expectAndConsume(diag::err_expected_lparen)) 2340 return ExprError(); 2341 2342 ExprResult ControllingExpr; 2343 { 2344 // C11 6.5.1.1p3 "The controlling expression of a generic selection is 2345 // not evaluated." 2346 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2347 ControllingExpr = ParseAssignmentExpression(); 2348 if (ControllingExpr.isInvalid()) { 2349 SkipUntil(tok::r_paren); 2350 return ExprError(); 2351 } 2352 } 2353 2354 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "")) { 2355 SkipUntil(tok::r_paren); 2356 return ExprError(); 2357 } 2358 2359 SourceLocation DefaultLoc; 2360 TypeVector Types; 2361 ExprVector Exprs; 2362 while (1) { 2363 ParsedType Ty; 2364 if (Tok.is(tok::kw_default)) { 2365 // C11 6.5.1.1p2 "A generic selection shall have no more than one default 2366 // generic association." 2367 if (!DefaultLoc.isInvalid()) { 2368 Diag(Tok, diag::err_duplicate_default_assoc); 2369 Diag(DefaultLoc, diag::note_previous_default_assoc); 2370 SkipUntil(tok::r_paren); 2371 return ExprError(); 2372 } 2373 DefaultLoc = ConsumeToken(); 2374 Ty = ParsedType(); 2375 } else { 2376 ColonProtectionRAIIObject X(*this); 2377 TypeResult TR = ParseTypeName(); 2378 if (TR.isInvalid()) { 2379 SkipUntil(tok::r_paren); 2380 return ExprError(); 2381 } 2382 Ty = TR.release(); 2383 } 2384 Types.push_back(Ty); 2385 2386 if (ExpectAndConsume(tok::colon, diag::err_expected_colon, "")) { 2387 SkipUntil(tok::r_paren); 2388 return ExprError(); 2389 } 2390 2391 // FIXME: These expressions should be parsed in a potentially potentially 2392 // evaluated context. 2393 ExprResult ER(ParseAssignmentExpression()); 2394 if (ER.isInvalid()) { 2395 SkipUntil(tok::r_paren); 2396 return ExprError(); 2397 } 2398 Exprs.push_back(ER.release()); 2399 2400 if (Tok.isNot(tok::comma)) 2401 break; 2402 ConsumeToken(); 2403 } 2404 2405 T.consumeClose(); 2406 if (T.getCloseLocation().isInvalid()) 2407 return ExprError(); 2408 2409 return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc, 2410 T.getCloseLocation(), 2411 ControllingExpr.release(), 2412 Types, Exprs); 2413} 2414 2415/// ParseExpressionList - Used for C/C++ (argument-)expression-list. 2416/// 2417/// \verbatim 2418/// argument-expression-list: 2419/// assignment-expression 2420/// argument-expression-list , assignment-expression 2421/// 2422/// [C++] expression-list: 2423/// [C++] assignment-expression 2424/// [C++] expression-list , assignment-expression 2425/// 2426/// [C++0x] expression-list: 2427/// [C++0x] initializer-list 2428/// 2429/// [C++0x] initializer-list 2430/// [C++0x] initializer-clause ...[opt] 2431/// [C++0x] initializer-list , initializer-clause ...[opt] 2432/// 2433/// [C++0x] initializer-clause: 2434/// [C++0x] assignment-expression 2435/// [C++0x] braced-init-list 2436/// \endverbatim 2437bool Parser::ParseExpressionList(SmallVectorImpl<Expr*> &Exprs, 2438 SmallVectorImpl<SourceLocation> &CommaLocs, 2439 void (Sema::*Completer)(Scope *S, 2440 Expr *Data, 2441 ArrayRef<Expr *> Args), 2442 Expr *Data) { 2443 while (1) { 2444 if (Tok.is(tok::code_completion)) { 2445 if (Completer) 2446 (Actions.*Completer)(getCurScope(), Data, Exprs); 2447 else 2448 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 2449 cutOffParsing(); 2450 return true; 2451 } 2452 2453 ExprResult Expr; 2454 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { 2455 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 2456 Expr = ParseBraceInitializer(); 2457 } else 2458 Expr = ParseAssignmentExpression(); 2459 2460 if (Tok.is(tok::ellipsis)) 2461 Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken()); 2462 if (Expr.isInvalid()) 2463 return true; 2464 2465 Exprs.push_back(Expr.release()); 2466 2467 if (Tok.isNot(tok::comma)) 2468 return false; 2469 // Move to the next argument, remember where the comma was. 2470 CommaLocs.push_back(ConsumeToken()); 2471 } 2472} 2473 2474/// ParseSimpleExpressionList - A simple comma-separated list of expressions, 2475/// used for misc language extensions. 2476/// 2477/// \verbatim 2478/// simple-expression-list: 2479/// assignment-expression 2480/// simple-expression-list , assignment-expression 2481/// \endverbatim 2482bool 2483Parser::ParseSimpleExpressionList(SmallVectorImpl<Expr*> &Exprs, 2484 SmallVectorImpl<SourceLocation> &CommaLocs) { 2485 while (1) { 2486 ExprResult Expr = ParseAssignmentExpression(); 2487 if (Expr.isInvalid()) 2488 return true; 2489 2490 Exprs.push_back(Expr.release()); 2491 2492 if (Tok.isNot(tok::comma)) 2493 return false; 2494 2495 // Move to the next argument, remember where the comma was. 2496 CommaLocs.push_back(ConsumeToken()); 2497 } 2498} 2499 2500/// ParseBlockId - Parse a block-id, which roughly looks like int (int x). 2501/// 2502/// \verbatim 2503/// [clang] block-id: 2504/// [clang] specifier-qualifier-list block-declarator 2505/// \endverbatim 2506void Parser::ParseBlockId(SourceLocation CaretLoc) { 2507 if (Tok.is(tok::code_completion)) { 2508 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type); 2509 return cutOffParsing(); 2510 } 2511 2512 // Parse the specifier-qualifier-list piece. 2513 DeclSpec DS(AttrFactory); 2514 ParseSpecifierQualifierList(DS); 2515 2516 // Parse the block-declarator. 2517 Declarator DeclaratorInfo(DS, Declarator::BlockLiteralContext); 2518 ParseDeclarator(DeclaratorInfo); 2519 2520 // We do this for: ^ __attribute__((noreturn)) {, as DS has the attributes. 2521 DeclaratorInfo.takeAttributes(DS.getAttributes(), SourceLocation()); 2522 2523 MaybeParseGNUAttributes(DeclaratorInfo); 2524 2525 // Inform sema that we are starting a block. 2526 Actions.ActOnBlockArguments(CaretLoc, DeclaratorInfo, getCurScope()); 2527} 2528 2529/// ParseBlockLiteralExpression - Parse a block literal, which roughly looks 2530/// like ^(int x){ return x+1; } 2531/// 2532/// \verbatim 2533/// block-literal: 2534/// [clang] '^' block-args[opt] compound-statement 2535/// [clang] '^' block-id compound-statement 2536/// [clang] block-args: 2537/// [clang] '(' parameter-list ')' 2538/// \endverbatim 2539ExprResult Parser::ParseBlockLiteralExpression() { 2540 assert(Tok.is(tok::caret) && "block literal starts with ^"); 2541 SourceLocation CaretLoc = ConsumeToken(); 2542 2543 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc, 2544 "block literal parsing"); 2545 2546 // Enter a scope to hold everything within the block. This includes the 2547 // argument decls, decls within the compound expression, etc. This also 2548 // allows determining whether a variable reference inside the block is 2549 // within or outside of the block. 2550 ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope | 2551 Scope::DeclScope); 2552 2553 // Inform sema that we are starting a block. 2554 Actions.ActOnBlockStart(CaretLoc, getCurScope()); 2555 2556 // Parse the return type if present. 2557 DeclSpec DS(AttrFactory); 2558 Declarator ParamInfo(DS, Declarator::BlockLiteralContext); 2559 // FIXME: Since the return type isn't actually parsed, it can't be used to 2560 // fill ParamInfo with an initial valid range, so do it manually. 2561 ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation())); 2562 2563 // If this block has arguments, parse them. There is no ambiguity here with 2564 // the expression case, because the expression case requires a parameter list. 2565 if (Tok.is(tok::l_paren)) { 2566 ParseParenDeclarator(ParamInfo); 2567 // Parse the pieces after the identifier as if we had "int(...)". 2568 // SetIdentifier sets the source range end, but in this case we're past 2569 // that location. 2570 SourceLocation Tmp = ParamInfo.getSourceRange().getEnd(); 2571 ParamInfo.SetIdentifier(0, CaretLoc); 2572 ParamInfo.SetRangeEnd(Tmp); 2573 if (ParamInfo.isInvalidType()) { 2574 // If there was an error parsing the arguments, they may have 2575 // tried to use ^(x+y) which requires an argument list. Just 2576 // skip the whole block literal. 2577 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2578 return ExprError(); 2579 } 2580 2581 MaybeParseGNUAttributes(ParamInfo); 2582 2583 // Inform sema that we are starting a block. 2584 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope()); 2585 } else if (!Tok.is(tok::l_brace)) { 2586 ParseBlockId(CaretLoc); 2587 } else { 2588 // Otherwise, pretend we saw (void). 2589 ParsedAttributes attrs(AttrFactory); 2590 SourceLocation NoLoc; 2591 ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/true, 2592 /*IsAmbiguous=*/false, 2593 /*RParenLoc=*/NoLoc, 2594 /*ArgInfo=*/0, 2595 /*NumArgs=*/0, 2596 /*EllipsisLoc=*/NoLoc, 2597 /*RParenLoc=*/NoLoc, 2598 /*TypeQuals=*/0, 2599 /*RefQualifierIsLvalueRef=*/true, 2600 /*RefQualifierLoc=*/NoLoc, 2601 /*ConstQualifierLoc=*/NoLoc, 2602 /*VolatileQualifierLoc=*/NoLoc, 2603 /*MutableLoc=*/NoLoc, 2604 EST_None, 2605 /*ESpecLoc=*/NoLoc, 2606 /*Exceptions=*/0, 2607 /*ExceptionRanges=*/0, 2608 /*NumExceptions=*/0, 2609 /*NoexceptExpr=*/0, 2610 CaretLoc, CaretLoc, 2611 ParamInfo), 2612 attrs, CaretLoc); 2613 2614 MaybeParseGNUAttributes(ParamInfo); 2615 2616 // Inform sema that we are starting a block. 2617 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope()); 2618 } 2619 2620 2621 ExprResult Result(true); 2622 if (!Tok.is(tok::l_brace)) { 2623 // Saw something like: ^expr 2624 Diag(Tok, diag::err_expected_expression); 2625 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2626 return ExprError(); 2627 } 2628 2629 StmtResult Stmt(ParseCompoundStatementBody()); 2630 BlockScope.Exit(); 2631 if (!Stmt.isInvalid()) 2632 Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.take(), getCurScope()); 2633 else 2634 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2635 return Result; 2636} 2637 2638/// ParseObjCBoolLiteral - This handles the objective-c Boolean literals. 2639/// 2640/// '__objc_yes' 2641/// '__objc_no' 2642ExprResult Parser::ParseObjCBoolLiteral() { 2643 tok::TokenKind Kind = Tok.getKind(); 2644 return Actions.ActOnObjCBoolLiteral(ConsumeToken(), Kind); 2645} 2646