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 return ParseRHSOfBinaryExpression(LHS, prec::Assignment); 170} 171 172/// \brief Parse an assignment expression where part of an Objective-C message 173/// send has already been parsed. 174/// 175/// In this case \p LBracLoc indicates the location of the '[' of the message 176/// send, and either \p ReceiverName or \p ReceiverExpr is non-null indicating 177/// the receiver of the message. 178/// 179/// Since this handles full assignment-expression's, it handles postfix 180/// expressions and other binary operators for these expressions as well. 181ExprResult 182Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc, 183 SourceLocation SuperLoc, 184 ParsedType ReceiverType, 185 Expr *ReceiverExpr) { 186 ExprResult R 187 = ParseObjCMessageExpressionBody(LBracLoc, SuperLoc, 188 ReceiverType, ReceiverExpr); 189 R = ParsePostfixExpressionSuffix(R); 190 return ParseRHSOfBinaryExpression(R, prec::Assignment); 191} 192 193 194ExprResult Parser::ParseConstantExpression(TypeCastState isTypeCast) { 195 // C++03 [basic.def.odr]p2: 196 // An expression is potentially evaluated unless it appears where an 197 // integral constant expression is required (see 5.19) [...]. 198 // C++98 and C++11 have no such rule, but this is only a defect in C++98. 199 EnterExpressionEvaluationContext Unevaluated(Actions, 200 Sema::ConstantEvaluated); 201 202 ExprResult LHS(ParseCastExpression(false, false, isTypeCast)); 203 ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::Conditional)); 204 return Actions.ActOnConstantExpression(Res); 205} 206 207bool Parser::isNotExpressionStart() { 208 tok::TokenKind K = Tok.getKind(); 209 if (K == tok::l_brace || K == tok::r_brace || 210 K == tok::kw_for || K == tok::kw_while || 211 K == tok::kw_if || K == tok::kw_else || 212 K == tok::kw_goto || K == tok::kw_try) 213 return true; 214 // If this is a decl-specifier, we can't be at the start of an expression. 215 return isKnownToBeDeclarationSpecifier(); 216} 217 218/// \brief Parse a binary expression that starts with \p LHS and has a 219/// precedence of at least \p MinPrec. 220ExprResult 221Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) { 222 prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(), 223 GreaterThanIsOperator, 224 getLangOpts().CPlusPlus11); 225 SourceLocation ColonLoc; 226 227 while (1) { 228 // If this token has a lower precedence than we are allowed to parse (e.g. 229 // because we are called recursively, or because the token is not a binop), 230 // then we are done! 231 if (NextTokPrec < MinPrec) 232 return LHS; 233 234 // Consume the operator, saving the operator token for error reporting. 235 Token OpToken = Tok; 236 ConsumeToken(); 237 238 // Bail out when encountering a comma followed by a token which can't 239 // possibly be the start of an expression. For instance: 240 // int f() { return 1, } 241 // We can't do this before consuming the comma, because 242 // isNotExpressionStart() looks at the token stream. 243 if (OpToken.is(tok::comma) && isNotExpressionStart()) { 244 PP.EnterToken(Tok); 245 Tok = OpToken; 246 return LHS; 247 } 248 249 // Special case handling for the ternary operator. 250 ExprResult TernaryMiddle(true); 251 if (NextTokPrec == prec::Conditional) { 252 if (Tok.isNot(tok::colon)) { 253 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 254 ColonProtectionRAIIObject X(*this); 255 256 // Handle this production specially: 257 // logical-OR-expression '?' expression ':' conditional-expression 258 // In particular, the RHS of the '?' is 'expression', not 259 // 'logical-OR-expression' as we might expect. 260 TernaryMiddle = ParseExpression(); 261 if (TernaryMiddle.isInvalid()) { 262 LHS = ExprError(); 263 TernaryMiddle = 0; 264 } 265 } else { 266 // Special case handling of "X ? Y : Z" where Y is empty: 267 // logical-OR-expression '?' ':' conditional-expression [GNU] 268 TernaryMiddle = 0; 269 Diag(Tok, diag::ext_gnu_conditional_expr); 270 } 271 272 if (Tok.is(tok::colon)) { 273 // Eat the colon. 274 ColonLoc = ConsumeToken(); 275 } else { 276 // Otherwise, we're missing a ':'. Assume that this was a typo that 277 // the user forgot. If we're not in a macro expansion, we can suggest 278 // a fixit hint. If there were two spaces before the current token, 279 // suggest inserting the colon in between them, otherwise insert ": ". 280 SourceLocation FILoc = Tok.getLocation(); 281 const char *FIText = ": "; 282 const SourceManager &SM = PP.getSourceManager(); 283 if (FILoc.isFileID() || PP.isAtStartOfMacroExpansion(FILoc, &FILoc)) { 284 assert(FILoc.isFileID()); 285 bool IsInvalid = false; 286 const char *SourcePtr = 287 SM.getCharacterData(FILoc.getLocWithOffset(-1), &IsInvalid); 288 if (!IsInvalid && *SourcePtr == ' ') { 289 SourcePtr = 290 SM.getCharacterData(FILoc.getLocWithOffset(-2), &IsInvalid); 291 if (!IsInvalid && *SourcePtr == ' ') { 292 FILoc = FILoc.getLocWithOffset(-1); 293 FIText = ":"; 294 } 295 } 296 } 297 298 Diag(Tok, diag::err_expected_colon) 299 << FixItHint::CreateInsertion(FILoc, FIText); 300 Diag(OpToken, diag::note_matching) << "?"; 301 ColonLoc = Tok.getLocation(); 302 } 303 } 304 305 // Code completion for the right-hand side of an assignment expression 306 // goes through a special hook that takes the left-hand side into account. 307 if (Tok.is(tok::code_completion) && NextTokPrec == prec::Assignment) { 308 Actions.CodeCompleteAssignmentRHS(getCurScope(), LHS.get()); 309 cutOffParsing(); 310 return ExprError(); 311 } 312 313 // Parse another leaf here for the RHS of the operator. 314 // ParseCastExpression works here because all RHS expressions in C have it 315 // as a prefix, at least. However, in C++, an assignment-expression could 316 // be a throw-expression, which is not a valid cast-expression. 317 // Therefore we need some special-casing here. 318 // Also note that the third operand of the conditional operator is 319 // an assignment-expression in C++, and in C++11, we can have a 320 // braced-init-list on the RHS of an assignment. For better diagnostics, 321 // parse as if we were allowed braced-init-lists everywhere, and check that 322 // they only appear on the RHS of assignments later. 323 ExprResult RHS; 324 bool RHSIsInitList = false; 325 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { 326 RHS = ParseBraceInitializer(); 327 RHSIsInitList = true; 328 } else if (getLangOpts().CPlusPlus && NextTokPrec <= prec::Conditional) 329 RHS = ParseAssignmentExpression(); 330 else 331 RHS = ParseCastExpression(false); 332 333 if (RHS.isInvalid()) 334 LHS = ExprError(); 335 336 // Remember the precedence of this operator and get the precedence of the 337 // operator immediately to the right of the RHS. 338 prec::Level ThisPrec = NextTokPrec; 339 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 340 getLangOpts().CPlusPlus11); 341 342 // Assignment and conditional expressions are right-associative. 343 bool isRightAssoc = ThisPrec == prec::Conditional || 344 ThisPrec == prec::Assignment; 345 346 // Get the precedence of the operator to the right of the RHS. If it binds 347 // more tightly with RHS than we do, evaluate it completely first. 348 if (ThisPrec < NextTokPrec || 349 (ThisPrec == NextTokPrec && isRightAssoc)) { 350 if (!RHS.isInvalid() && RHSIsInitList) { 351 Diag(Tok, diag::err_init_list_bin_op) 352 << /*LHS*/0 << PP.getSpelling(Tok) << Actions.getExprRange(RHS.get()); 353 RHS = ExprError(); 354 } 355 // If this is left-associative, only parse things on the RHS that bind 356 // more tightly than the current operator. If it is left-associative, it 357 // is okay, to bind exactly as tightly. For example, compile A=B=C=D as 358 // A=(B=(C=D)), where each paren is a level of recursion here. 359 // The function takes ownership of the RHS. 360 RHS = ParseRHSOfBinaryExpression(RHS, 361 static_cast<prec::Level>(ThisPrec + !isRightAssoc)); 362 RHSIsInitList = false; 363 364 if (RHS.isInvalid()) 365 LHS = ExprError(); 366 367 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 368 getLangOpts().CPlusPlus11); 369 } 370 assert(NextTokPrec <= ThisPrec && "Recursion didn't work!"); 371 372 if (!RHS.isInvalid() && RHSIsInitList) { 373 if (ThisPrec == prec::Assignment) { 374 Diag(OpToken, diag::warn_cxx98_compat_generalized_initializer_lists) 375 << Actions.getExprRange(RHS.get()); 376 } else { 377 Diag(OpToken, diag::err_init_list_bin_op) 378 << /*RHS*/1 << PP.getSpelling(OpToken) 379 << Actions.getExprRange(RHS.get()); 380 LHS = ExprError(); 381 } 382 } 383 384 if (!LHS.isInvalid()) { 385 // Combine the LHS and RHS into the LHS (e.g. build AST). 386 if (TernaryMiddle.isInvalid()) { 387 // If we're using '>>' as an operator within a template 388 // argument list (in C++98), suggest the addition of 389 // parentheses so that the code remains well-formed in C++0x. 390 if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater)) 391 SuggestParentheses(OpToken.getLocation(), 392 diag::warn_cxx0x_right_shift_in_template_arg, 393 SourceRange(Actions.getExprRange(LHS.get()).getBegin(), 394 Actions.getExprRange(RHS.get()).getEnd())); 395 396 LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(), 397 OpToken.getKind(), LHS.take(), RHS.take()); 398 } else 399 LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc, 400 LHS.take(), TernaryMiddle.take(), 401 RHS.take()); 402 } 403 } 404} 405 406/// \brief Parse a cast-expression, or, if \p isUnaryExpression is true, 407/// parse a unary-expression. 408/// 409/// \p isAddressOfOperand exists because an id-expression that is the 410/// operand of address-of gets special treatment due to member pointers. 411/// 412ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 413 bool isAddressOfOperand, 414 TypeCastState isTypeCast) { 415 bool NotCastExpr; 416 ExprResult Res = ParseCastExpression(isUnaryExpression, 417 isAddressOfOperand, 418 NotCastExpr, 419 isTypeCast); 420 if (NotCastExpr) 421 Diag(Tok, diag::err_expected_expression); 422 return Res; 423} 424 425namespace { 426class CastExpressionIdValidator : public CorrectionCandidateCallback { 427 public: 428 CastExpressionIdValidator(bool AllowTypes, bool AllowNonTypes) 429 : AllowNonTypes(AllowNonTypes) { 430 WantTypeSpecifiers = AllowTypes; 431 } 432 433 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 434 NamedDecl *ND = candidate.getCorrectionDecl(); 435 if (!ND) 436 return candidate.isKeyword(); 437 438 if (isa<TypeDecl>(ND)) 439 return WantTypeSpecifiers; 440 return AllowNonTypes; 441 } 442 443 private: 444 bool AllowNonTypes; 445}; 446} 447 448/// \brief Parse a cast-expression, or, if \pisUnaryExpression is true, parse 449/// a unary-expression. 450/// 451/// \p isAddressOfOperand exists because an id-expression that is the operand 452/// of address-of gets special treatment due to member pointers. NotCastExpr 453/// is set to true if the token is not the start of a cast-expression, and no 454/// diagnostic is emitted in this case. 455/// 456/// \verbatim 457/// cast-expression: [C99 6.5.4] 458/// unary-expression 459/// '(' type-name ')' cast-expression 460/// 461/// unary-expression: [C99 6.5.3] 462/// postfix-expression 463/// '++' unary-expression 464/// '--' unary-expression 465/// unary-operator cast-expression 466/// 'sizeof' unary-expression 467/// 'sizeof' '(' type-name ')' 468/// [C++11] 'sizeof' '...' '(' identifier ')' 469/// [GNU] '__alignof' unary-expression 470/// [GNU] '__alignof' '(' type-name ')' 471/// [C11] '_Alignof' '(' type-name ')' 472/// [C++11] 'alignof' '(' type-id ')' 473/// [GNU] '&&' identifier 474/// [C++11] 'noexcept' '(' expression ')' [C++11 5.3.7] 475/// [C++] new-expression 476/// [C++] delete-expression 477/// 478/// unary-operator: one of 479/// '&' '*' '+' '-' '~' '!' 480/// [GNU] '__extension__' '__real' '__imag' 481/// 482/// primary-expression: [C99 6.5.1] 483/// [C99] identifier 484/// [C++] id-expression 485/// constant 486/// string-literal 487/// [C++] boolean-literal [C++ 2.13.5] 488/// [C++11] 'nullptr' [C++11 2.14.7] 489/// [C++11] user-defined-literal 490/// '(' expression ')' 491/// [C11] generic-selection 492/// '__func__' [C99 6.4.2.2] 493/// [GNU] '__FUNCTION__' 494/// [GNU] '__PRETTY_FUNCTION__' 495/// [GNU] '(' compound-statement ')' 496/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 497/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 498/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 499/// assign-expr ')' 500/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 501/// [GNU] '__null' 502/// [OBJC] '[' objc-message-expr ']' 503/// [OBJC] '\@selector' '(' objc-selector-arg ')' 504/// [OBJC] '\@protocol' '(' identifier ')' 505/// [OBJC] '\@encode' '(' type-name ')' 506/// [OBJC] objc-string-literal 507/// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 508/// [C++11] simple-type-specifier braced-init-list [C++11 5.2.3] 509/// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 510/// [C++11] typename-specifier braced-init-list [C++11 5.2.3] 511/// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 512/// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 513/// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 514/// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 515/// [C++] 'typeid' '(' expression ')' [C++ 5.2p1] 516/// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1] 517/// [C++] 'this' [C++ 9.3.2] 518/// [G++] unary-type-trait '(' type-id ')' 519/// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO] 520/// [EMBT] array-type-trait '(' type-id ',' integer ')' 521/// [clang] '^' block-literal 522/// 523/// constant: [C99 6.4.4] 524/// integer-constant 525/// floating-constant 526/// enumeration-constant -> identifier 527/// character-constant 528/// 529/// id-expression: [C++ 5.1] 530/// unqualified-id 531/// qualified-id 532/// 533/// unqualified-id: [C++ 5.1] 534/// identifier 535/// operator-function-id 536/// conversion-function-id 537/// '~' class-name 538/// template-id 539/// 540/// new-expression: [C++ 5.3.4] 541/// '::'[opt] 'new' new-placement[opt] new-type-id 542/// new-initializer[opt] 543/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 544/// new-initializer[opt] 545/// 546/// delete-expression: [C++ 5.3.5] 547/// '::'[opt] 'delete' cast-expression 548/// '::'[opt] 'delete' '[' ']' cast-expression 549/// 550/// [GNU/Embarcadero] unary-type-trait: 551/// '__is_arithmetic' 552/// '__is_floating_point' 553/// '__is_integral' 554/// '__is_lvalue_expr' 555/// '__is_rvalue_expr' 556/// '__is_complete_type' 557/// '__is_void' 558/// '__is_array' 559/// '__is_function' 560/// '__is_reference' 561/// '__is_lvalue_reference' 562/// '__is_rvalue_reference' 563/// '__is_fundamental' 564/// '__is_object' 565/// '__is_scalar' 566/// '__is_compound' 567/// '__is_pointer' 568/// '__is_member_object_pointer' 569/// '__is_member_function_pointer' 570/// '__is_member_pointer' 571/// '__is_const' 572/// '__is_volatile' 573/// '__is_trivial' 574/// '__is_standard_layout' 575/// '__is_signed' 576/// '__is_unsigned' 577/// 578/// [GNU] unary-type-trait: 579/// '__has_nothrow_assign' 580/// '__has_nothrow_copy' 581/// '__has_nothrow_constructor' 582/// '__has_trivial_assign' [TODO] 583/// '__has_trivial_copy' [TODO] 584/// '__has_trivial_constructor' 585/// '__has_trivial_destructor' 586/// '__has_virtual_destructor' 587/// '__is_abstract' [TODO] 588/// '__is_class' 589/// '__is_empty' [TODO] 590/// '__is_enum' 591/// '__is_final' 592/// '__is_pod' 593/// '__is_polymorphic' 594/// '__is_trivial' 595/// '__is_union' 596/// 597/// [Clang] unary-type-trait: 598/// '__trivially_copyable' 599/// 600/// binary-type-trait: 601/// [GNU] '__is_base_of' 602/// [MS] '__is_convertible_to' 603/// '__is_convertible' 604/// '__is_same' 605/// 606/// [Embarcadero] array-type-trait: 607/// '__array_rank' 608/// '__array_extent' 609/// 610/// [Embarcadero] expression-trait: 611/// '__is_lvalue_expr' 612/// '__is_rvalue_expr' 613/// \endverbatim 614/// 615ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 616 bool isAddressOfOperand, 617 bool &NotCastExpr, 618 TypeCastState isTypeCast) { 619 ExprResult Res; 620 tok::TokenKind SavedKind = Tok.getKind(); 621 NotCastExpr = false; 622 623 // This handles all of cast-expression, unary-expression, postfix-expression, 624 // and primary-expression. We handle them together like this for efficiency 625 // and to simplify handling of an expression starting with a '(' token: which 626 // may be one of a parenthesized expression, cast-expression, compound literal 627 // expression, or statement expression. 628 // 629 // If the parsed tokens consist of a primary-expression, the cases below 630 // break out of the switch; at the end we call ParsePostfixExpressionSuffix 631 // to handle the postfix expression suffixes. Cases that cannot be followed 632 // by postfix exprs should return without invoking 633 // ParsePostfixExpressionSuffix. 634 switch (SavedKind) { 635 case tok::l_paren: { 636 // If this expression is limited to being a unary-expression, the parent can 637 // not start a cast expression. 638 ParenParseOption ParenExprType = 639 (isUnaryExpression && !getLangOpts().CPlusPlus)? CompoundLiteral : CastExpr; 640 ParsedType CastTy; 641 SourceLocation RParenLoc; 642 643 { 644 // The inside of the parens don't need to be a colon protected scope, and 645 // isn't immediately a message send. 646 ColonProtectionRAIIObject X(*this, false); 647 648 Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/, 649 isTypeCast == IsTypeCast, CastTy, RParenLoc); 650 } 651 652 switch (ParenExprType) { 653 case SimpleExpr: break; // Nothing else to do. 654 case CompoundStmt: break; // Nothing else to do. 655 case CompoundLiteral: 656 // We parsed '(' type-name ')' '{' ... '}'. If any suffixes of 657 // postfix-expression exist, parse them now. 658 break; 659 case CastExpr: 660 // We have parsed the cast-expression and no postfix-expr pieces are 661 // following. 662 return Res; 663 } 664 665 break; 666 } 667 668 // primary-expression 669 case tok::numeric_constant: 670 // constant: integer-constant 671 // constant: floating-constant 672 673 Res = Actions.ActOnNumericConstant(Tok, /*UDLScope*/getCurScope()); 674 ConsumeToken(); 675 break; 676 677 case tok::kw_true: 678 case tok::kw_false: 679 return ParseCXXBoolLiteral(); 680 681 case tok::kw___objc_yes: 682 case tok::kw___objc_no: 683 return ParseObjCBoolLiteral(); 684 685 case tok::kw_nullptr: 686 Diag(Tok, diag::warn_cxx98_compat_nullptr); 687 return Actions.ActOnCXXNullPtrLiteral(ConsumeToken()); 688 689 case tok::annot_primary_expr: 690 assert(Res.get() == 0 && "Stray primary-expression annotation?"); 691 Res = getExprAnnotation(Tok); 692 ConsumeToken(); 693 break; 694 695 case tok::kw_decltype: 696 case tok::identifier: { // primary-expression: identifier 697 // unqualified-id: identifier 698 // constant: enumeration-constant 699 // Turn a potentially qualified name into a annot_typename or 700 // annot_cxxscope if it would be valid. This handles things like x::y, etc. 701 if (getLangOpts().CPlusPlus) { 702 // Avoid the unnecessary parse-time lookup in the common case 703 // where the syntax forbids a type. 704 const Token &Next = NextToken(); 705 706 // If this identifier was reverted from a token ID, and the next token 707 // is a parenthesis, this is likely to be a use of a type trait. Check 708 // those tokens. 709 if (Next.is(tok::l_paren) && 710 Tok.is(tok::identifier) && 711 Tok.getIdentifierInfo()->hasRevertedTokenIDToIdentifier()) { 712 IdentifierInfo *II = Tok.getIdentifierInfo(); 713 // Build up the mapping of revertable type traits, for future use. 714 if (RevertableTypeTraits.empty()) { 715#define RTT_JOIN(X,Y) X##Y 716#define REVERTABLE_TYPE_TRAIT(Name) \ 717 RevertableTypeTraits[PP.getIdentifierInfo(#Name)] \ 718 = RTT_JOIN(tok::kw_,Name) 719 720 REVERTABLE_TYPE_TRAIT(__is_arithmetic); 721 REVERTABLE_TYPE_TRAIT(__is_convertible); 722 REVERTABLE_TYPE_TRAIT(__is_empty); 723 REVERTABLE_TYPE_TRAIT(__is_floating_point); 724 REVERTABLE_TYPE_TRAIT(__is_function); 725 REVERTABLE_TYPE_TRAIT(__is_fundamental); 726 REVERTABLE_TYPE_TRAIT(__is_integral); 727 REVERTABLE_TYPE_TRAIT(__is_member_function_pointer); 728 REVERTABLE_TYPE_TRAIT(__is_member_pointer); 729 REVERTABLE_TYPE_TRAIT(__is_pod); 730 REVERTABLE_TYPE_TRAIT(__is_pointer); 731 REVERTABLE_TYPE_TRAIT(__is_same); 732 REVERTABLE_TYPE_TRAIT(__is_scalar); 733 REVERTABLE_TYPE_TRAIT(__is_signed); 734 REVERTABLE_TYPE_TRAIT(__is_unsigned); 735 REVERTABLE_TYPE_TRAIT(__is_void); 736#undef REVERTABLE_TYPE_TRAIT 737#undef RTT_JOIN 738 } 739 740 // If we find that this is in fact the name of a type trait, 741 // update the token kind in place and parse again to treat it as 742 // the appropriate kind of type trait. 743 llvm::SmallDenseMap<IdentifierInfo *, tok::TokenKind>::iterator Known 744 = RevertableTypeTraits.find(II); 745 if (Known != RevertableTypeTraits.end()) { 746 Tok.setKind(Known->second); 747 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 748 NotCastExpr, isTypeCast); 749 } 750 } 751 752 if (Next.is(tok::coloncolon) || 753 (!ColonIsSacred && Next.is(tok::colon)) || 754 Next.is(tok::less) || 755 Next.is(tok::l_paren) || 756 Next.is(tok::l_brace)) { 757 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 758 if (TryAnnotateTypeOrScopeToken()) 759 return ExprError(); 760 if (!Tok.is(tok::identifier)) 761 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 762 } 763 } 764 765 // Consume the identifier so that we can see if it is followed by a '(' or 766 // '.'. 767 IdentifierInfo &II = *Tok.getIdentifierInfo(); 768 SourceLocation ILoc = ConsumeToken(); 769 770 // Support 'Class.property' and 'super.property' notation. 771 if (getLangOpts().ObjC1 && Tok.is(tok::period) && 772 (Actions.getTypeName(II, ILoc, getCurScope()) || 773 // Allow the base to be 'super' if in an objc-method. 774 (&II == Ident_super && getCurScope()->isInObjcMethodScope()))) { 775 ConsumeToken(); 776 777 // Allow either an identifier or the keyword 'class' (in C++). 778 if (Tok.isNot(tok::identifier) && 779 !(getLangOpts().CPlusPlus && Tok.is(tok::kw_class))) { 780 Diag(Tok, diag::err_expected_property_name); 781 return ExprError(); 782 } 783 IdentifierInfo &PropertyName = *Tok.getIdentifierInfo(); 784 SourceLocation PropertyLoc = ConsumeToken(); 785 786 Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName, 787 ILoc, PropertyLoc); 788 break; 789 } 790 791 // In an Objective-C method, if we have "super" followed by an identifier, 792 // the token sequence is ill-formed. However, if there's a ':' or ']' after 793 // that identifier, this is probably a message send with a missing open 794 // bracket. Treat it as such. 795 if (getLangOpts().ObjC1 && &II == Ident_super && !InMessageExpression && 796 getCurScope()->isInObjcMethodScope() && 797 ((Tok.is(tok::identifier) && 798 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) || 799 Tok.is(tok::code_completion))) { 800 Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, ParsedType(), 801 0); 802 break; 803 } 804 805 // If we have an Objective-C class name followed by an identifier 806 // and either ':' or ']', this is an Objective-C class message 807 // send that's missing the opening '['. Recovery 808 // appropriately. Also take this path if we're performing code 809 // completion after an Objective-C class name. 810 if (getLangOpts().ObjC1 && 811 ((Tok.is(tok::identifier) && !InMessageExpression) || 812 Tok.is(tok::code_completion))) { 813 const Token& Next = NextToken(); 814 if (Tok.is(tok::code_completion) || 815 Next.is(tok::colon) || Next.is(tok::r_square)) 816 if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope())) 817 if (Typ.get()->isObjCObjectOrInterfaceType()) { 818 // Fake up a Declarator to use with ActOnTypeName. 819 DeclSpec DS(AttrFactory); 820 DS.SetRangeStart(ILoc); 821 DS.SetRangeEnd(ILoc); 822 const char *PrevSpec = 0; 823 unsigned DiagID; 824 DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ); 825 826 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 827 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), 828 DeclaratorInfo); 829 if (Ty.isInvalid()) 830 break; 831 832 Res = ParseObjCMessageExpressionBody(SourceLocation(), 833 SourceLocation(), 834 Ty.get(), 0); 835 break; 836 } 837 } 838 839 // Make sure to pass down the right value for isAddressOfOperand. 840 if (isAddressOfOperand && isPostfixExpressionSuffixStart()) 841 isAddressOfOperand = false; 842 843 // Function designators are allowed to be undeclared (C99 6.5.1p2), so we 844 // need to know whether or not this identifier is a function designator or 845 // not. 846 UnqualifiedId Name; 847 CXXScopeSpec ScopeSpec; 848 SourceLocation TemplateKWLoc; 849 CastExpressionIdValidator Validator(isTypeCast != NotTypeCast, 850 isTypeCast != IsTypeCast); 851 Name.setIdentifier(&II, ILoc); 852 Res = Actions.ActOnIdExpression(getCurScope(), ScopeSpec, TemplateKWLoc, 853 Name, Tok.is(tok::l_paren), 854 isAddressOfOperand, &Validator); 855 break; 856 } 857 case tok::char_constant: // constant: character-constant 858 case tok::wide_char_constant: 859 case tok::utf16_char_constant: 860 case tok::utf32_char_constant: 861 Res = Actions.ActOnCharacterConstant(Tok, /*UDLScope*/getCurScope()); 862 ConsumeToken(); 863 break; 864 case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2] 865 case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU] 866 case tok::kw_L__FUNCTION__: // primary-expression: L__FUNCTION__ [MS] 867 case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU] 868 Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind); 869 ConsumeToken(); 870 break; 871 case tok::string_literal: // primary-expression: string-literal 872 case tok::wide_string_literal: 873 case tok::utf8_string_literal: 874 case tok::utf16_string_literal: 875 case tok::utf32_string_literal: 876 Res = ParseStringLiteralExpression(true); 877 break; 878 case tok::kw__Generic: // primary-expression: generic-selection [C11 6.5.1] 879 Res = ParseGenericSelectionExpression(); 880 break; 881 case tok::kw___builtin_va_arg: 882 case tok::kw___builtin_offsetof: 883 case tok::kw___builtin_choose_expr: 884 case tok::kw___builtin_astype: // primary-expression: [OCL] as_type() 885 return ParseBuiltinPrimaryExpression(); 886 case tok::kw___null: 887 return Actions.ActOnGNUNullExpr(ConsumeToken()); 888 889 case tok::plusplus: // unary-expression: '++' unary-expression [C99] 890 case tok::minusminus: { // unary-expression: '--' unary-expression [C99] 891 // C++ [expr.unary] has: 892 // unary-expression: 893 // ++ cast-expression 894 // -- cast-expression 895 SourceLocation SavedLoc = ConsumeToken(); 896 Res = ParseCastExpression(!getLangOpts().CPlusPlus); 897 if (!Res.isInvalid()) 898 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 899 return Res; 900 } 901 case tok::amp: { // unary-expression: '&' cast-expression 902 // Special treatment because of member pointers 903 SourceLocation SavedLoc = ConsumeToken(); 904 Res = ParseCastExpression(false, true); 905 if (!Res.isInvalid()) 906 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 907 return Res; 908 } 909 910 case tok::star: // unary-expression: '*' cast-expression 911 case tok::plus: // unary-expression: '+' cast-expression 912 case tok::minus: // unary-expression: '-' cast-expression 913 case tok::tilde: // unary-expression: '~' cast-expression 914 case tok::exclaim: // unary-expression: '!' cast-expression 915 case tok::kw___real: // unary-expression: '__real' cast-expression [GNU] 916 case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU] 917 SourceLocation SavedLoc = ConsumeToken(); 918 Res = ParseCastExpression(false); 919 if (!Res.isInvalid()) 920 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 921 return Res; 922 } 923 924 case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU] 925 // __extension__ silences extension warnings in the subexpression. 926 ExtensionRAIIObject O(Diags); // Use RAII to do this. 927 SourceLocation SavedLoc = ConsumeToken(); 928 Res = ParseCastExpression(false); 929 if (!Res.isInvalid()) 930 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 931 return Res; 932 } 933 case tok::kw__Alignof: // unary-expression: '_Alignof' '(' type-name ')' 934 if (!getLangOpts().C11) 935 Diag(Tok, diag::ext_c11_alignment) << Tok.getName(); 936 // fallthrough 937 case tok::kw_alignof: // unary-expression: 'alignof' '(' type-id ')' 938 case tok::kw___alignof: // unary-expression: '__alignof' unary-expression 939 // unary-expression: '__alignof' '(' type-name ')' 940 case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression 941 // unary-expression: 'sizeof' '(' type-name ')' 942 case tok::kw_vec_step: // unary-expression: OpenCL 'vec_step' expression 943 return ParseUnaryExprOrTypeTraitExpression(); 944 case tok::ampamp: { // unary-expression: '&&' identifier 945 SourceLocation AmpAmpLoc = ConsumeToken(); 946 if (Tok.isNot(tok::identifier)) 947 return ExprError(Diag(Tok, diag::err_expected_ident)); 948 949 if (getCurScope()->getFnParent() == 0) 950 return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn)); 951 952 Diag(AmpAmpLoc, diag::ext_gnu_address_of_label); 953 LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(), 954 Tok.getLocation()); 955 Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD); 956 ConsumeToken(); 957 return Res; 958 } 959 case tok::kw_const_cast: 960 case tok::kw_dynamic_cast: 961 case tok::kw_reinterpret_cast: 962 case tok::kw_static_cast: 963 Res = ParseCXXCasts(); 964 break; 965 case tok::kw_typeid: 966 Res = ParseCXXTypeid(); 967 break; 968 case tok::kw___uuidof: 969 Res = ParseCXXUuidof(); 970 break; 971 case tok::kw_this: 972 Res = ParseCXXThis(); 973 break; 974 975 case tok::annot_typename: 976 if (isStartOfObjCClassMessageMissingOpenBracket()) { 977 ParsedType Type = getTypeAnnotation(Tok); 978 979 // Fake up a Declarator to use with ActOnTypeName. 980 DeclSpec DS(AttrFactory); 981 DS.SetRangeStart(Tok.getLocation()); 982 DS.SetRangeEnd(Tok.getLastLoc()); 983 984 const char *PrevSpec = 0; 985 unsigned DiagID; 986 DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(), 987 PrevSpec, DiagID, Type); 988 989 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 990 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 991 if (Ty.isInvalid()) 992 break; 993 994 ConsumeToken(); 995 Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 996 Ty.get(), 0); 997 break; 998 } 999 // Fall through 1000 1001 case tok::annot_decltype: 1002 case tok::kw_char: 1003 case tok::kw_wchar_t: 1004 case tok::kw_char16_t: 1005 case tok::kw_char32_t: 1006 case tok::kw_bool: 1007 case tok::kw_short: 1008 case tok::kw_int: 1009 case tok::kw_long: 1010 case tok::kw___int64: 1011 case tok::kw___int128: 1012 case tok::kw_signed: 1013 case tok::kw_unsigned: 1014 case tok::kw_half: 1015 case tok::kw_float: 1016 case tok::kw_double: 1017 case tok::kw_void: 1018 case tok::kw_typename: 1019 case tok::kw_typeof: 1020 case tok::kw___vector: 1021 case tok::kw_image1d_t: 1022 case tok::kw_image1d_array_t: 1023 case tok::kw_image1d_buffer_t: 1024 case tok::kw_image2d_t: 1025 case tok::kw_image2d_array_t: 1026 case tok::kw_image3d_t: 1027 case tok::kw_sampler_t: 1028 case tok::kw_event_t: { 1029 if (!getLangOpts().CPlusPlus) { 1030 Diag(Tok, diag::err_expected_expression); 1031 return ExprError(); 1032 } 1033 1034 if (SavedKind == tok::kw_typename) { 1035 // postfix-expression: typename-specifier '(' expression-list[opt] ')' 1036 // typename-specifier braced-init-list 1037 if (TryAnnotateTypeOrScopeToken()) 1038 return ExprError(); 1039 } 1040 1041 // postfix-expression: simple-type-specifier '(' expression-list[opt] ')' 1042 // simple-type-specifier braced-init-list 1043 // 1044 DeclSpec DS(AttrFactory); 1045 ParseCXXSimpleTypeSpecifier(DS); 1046 if (Tok.isNot(tok::l_paren) && 1047 (!getLangOpts().CPlusPlus11 || Tok.isNot(tok::l_brace))) 1048 return ExprError(Diag(Tok, diag::err_expected_lparen_after_type) 1049 << DS.getSourceRange()); 1050 1051 if (Tok.is(tok::l_brace)) 1052 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 1053 1054 Res = ParseCXXTypeConstructExpression(DS); 1055 break; 1056 } 1057 1058 case tok::annot_cxxscope: { // [C++] id-expression: qualified-id 1059 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 1060 // (We can end up in this situation after tentative parsing.) 1061 if (TryAnnotateTypeOrScopeToken()) 1062 return ExprError(); 1063 if (!Tok.is(tok::annot_cxxscope)) 1064 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1065 NotCastExpr, isTypeCast); 1066 1067 Token Next = NextToken(); 1068 if (Next.is(tok::annot_template_id)) { 1069 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next); 1070 if (TemplateId->Kind == TNK_Type_template) { 1071 // We have a qualified template-id that we know refers to a 1072 // type, translate it into a type and continue parsing as a 1073 // cast expression. 1074 CXXScopeSpec SS; 1075 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), 1076 /*EnteringContext=*/false); 1077 AnnotateTemplateIdTokenAsType(); 1078 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1079 NotCastExpr, isTypeCast); 1080 } 1081 } 1082 1083 // Parse as an id-expression. 1084 Res = ParseCXXIdExpression(isAddressOfOperand); 1085 break; 1086 } 1087 1088 case tok::annot_template_id: { // [C++] template-id 1089 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 1090 if (TemplateId->Kind == TNK_Type_template) { 1091 // We have a template-id that we know refers to a type, 1092 // translate it into a type and continue parsing as a cast 1093 // expression. 1094 AnnotateTemplateIdTokenAsType(); 1095 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1096 NotCastExpr, isTypeCast); 1097 } 1098 1099 // Fall through to treat the template-id as an id-expression. 1100 } 1101 1102 case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id 1103 Res = ParseCXXIdExpression(isAddressOfOperand); 1104 break; 1105 1106 case tok::coloncolon: { 1107 // ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken 1108 // annotates the token, tail recurse. 1109 if (TryAnnotateTypeOrScopeToken()) 1110 return ExprError(); 1111 if (!Tok.is(tok::coloncolon)) 1112 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 1113 1114 // ::new -> [C++] new-expression 1115 // ::delete -> [C++] delete-expression 1116 SourceLocation CCLoc = ConsumeToken(); 1117 if (Tok.is(tok::kw_new)) 1118 return ParseCXXNewExpression(true, CCLoc); 1119 if (Tok.is(tok::kw_delete)) 1120 return ParseCXXDeleteExpression(true, CCLoc); 1121 1122 // This is not a type name or scope specifier, it is an invalid expression. 1123 Diag(CCLoc, diag::err_expected_expression); 1124 return ExprError(); 1125 } 1126 1127 case tok::kw_new: // [C++] new-expression 1128 return ParseCXXNewExpression(false, Tok.getLocation()); 1129 1130 case tok::kw_delete: // [C++] delete-expression 1131 return ParseCXXDeleteExpression(false, Tok.getLocation()); 1132 1133 case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')' 1134 Diag(Tok, diag::warn_cxx98_compat_noexcept_expr); 1135 SourceLocation KeyLoc = ConsumeToken(); 1136 BalancedDelimiterTracker T(*this, tok::l_paren); 1137 1138 if (T.expectAndConsume(diag::err_expected_lparen_after, "noexcept")) 1139 return ExprError(); 1140 // C++11 [expr.unary.noexcept]p1: 1141 // The noexcept operator determines whether the evaluation of its operand, 1142 // which is an unevaluated operand, can throw an exception. 1143 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 1144 ExprResult Result = ParseExpression(); 1145 1146 T.consumeClose(); 1147 1148 if (!Result.isInvalid()) 1149 Result = Actions.ActOnNoexceptExpr(KeyLoc, T.getOpenLocation(), 1150 Result.take(), T.getCloseLocation()); 1151 return Result; 1152 } 1153 1154 case tok::kw___is_abstract: // [GNU] unary-type-trait 1155 case tok::kw___is_class: 1156 case tok::kw___is_empty: 1157 case tok::kw___is_enum: 1158 case tok::kw___is_interface_class: 1159 case tok::kw___is_literal: 1160 case tok::kw___is_arithmetic: 1161 case tok::kw___is_integral: 1162 case tok::kw___is_floating_point: 1163 case tok::kw___is_complete_type: 1164 case tok::kw___is_void: 1165 case tok::kw___is_array: 1166 case tok::kw___is_function: 1167 case tok::kw___is_reference: 1168 case tok::kw___is_lvalue_reference: 1169 case tok::kw___is_rvalue_reference: 1170 case tok::kw___is_fundamental: 1171 case tok::kw___is_object: 1172 case tok::kw___is_scalar: 1173 case tok::kw___is_compound: 1174 case tok::kw___is_pointer: 1175 case tok::kw___is_member_object_pointer: 1176 case tok::kw___is_member_function_pointer: 1177 case tok::kw___is_member_pointer: 1178 case tok::kw___is_const: 1179 case tok::kw___is_volatile: 1180 case tok::kw___is_standard_layout: 1181 case tok::kw___is_signed: 1182 case tok::kw___is_unsigned: 1183 case tok::kw___is_literal_type: 1184 case tok::kw___is_pod: 1185 case tok::kw___is_polymorphic: 1186 case tok::kw___is_trivial: 1187 case tok::kw___is_trivially_copyable: 1188 case tok::kw___is_union: 1189 case tok::kw___is_final: 1190 case tok::kw___has_trivial_constructor: 1191 case tok::kw___has_trivial_copy: 1192 case tok::kw___has_trivial_assign: 1193 case tok::kw___has_trivial_destructor: 1194 case tok::kw___has_nothrow_assign: 1195 case tok::kw___has_nothrow_copy: 1196 case tok::kw___has_nothrow_constructor: 1197 case tok::kw___has_virtual_destructor: 1198 return ParseUnaryTypeTrait(); 1199 1200 case tok::kw___builtin_types_compatible_p: 1201 case tok::kw___is_base_of: 1202 case tok::kw___is_same: 1203 case tok::kw___is_convertible: 1204 case tok::kw___is_convertible_to: 1205 case tok::kw___is_trivially_assignable: 1206 return ParseBinaryTypeTrait(); 1207 1208 case tok::kw___is_trivially_constructible: 1209 return ParseTypeTrait(); 1210 1211 case tok::kw___array_rank: 1212 case tok::kw___array_extent: 1213 return ParseArrayTypeTrait(); 1214 1215 case tok::kw___is_lvalue_expr: 1216 case tok::kw___is_rvalue_expr: 1217 return ParseExpressionTrait(); 1218 1219 case tok::at: { 1220 SourceLocation AtLoc = ConsumeToken(); 1221 return ParseObjCAtExpression(AtLoc); 1222 } 1223 case tok::caret: 1224 Res = ParseBlockLiteralExpression(); 1225 break; 1226 case tok::code_completion: { 1227 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 1228 cutOffParsing(); 1229 return ExprError(); 1230 } 1231 case tok::l_square: 1232 if (getLangOpts().CPlusPlus11) { 1233 if (getLangOpts().ObjC1) { 1234 // C++11 lambda expressions and Objective-C message sends both start with a 1235 // square bracket. There are three possibilities here: 1236 // we have a valid lambda expression, we have an invalid lambda 1237 // expression, or we have something that doesn't appear to be a lambda. 1238 // If we're in the last case, we fall back to ParseObjCMessageExpression. 1239 Res = TryParseLambdaExpression(); 1240 if (!Res.isInvalid() && !Res.get()) 1241 Res = ParseObjCMessageExpression(); 1242 break; 1243 } 1244 Res = ParseLambdaExpression(); 1245 break; 1246 } 1247 if (getLangOpts().ObjC1) { 1248 Res = ParseObjCMessageExpression(); 1249 break; 1250 } 1251 // FALL THROUGH. 1252 default: 1253 NotCastExpr = true; 1254 return ExprError(); 1255 } 1256 1257 // These can be followed by postfix-expr pieces. 1258 return ParsePostfixExpressionSuffix(Res); 1259} 1260 1261/// \brief Once the leading part of a postfix-expression is parsed, this 1262/// method parses any suffixes that apply. 1263/// 1264/// \verbatim 1265/// postfix-expression: [C99 6.5.2] 1266/// primary-expression 1267/// postfix-expression '[' expression ']' 1268/// postfix-expression '[' braced-init-list ']' 1269/// postfix-expression '(' argument-expression-list[opt] ')' 1270/// postfix-expression '.' identifier 1271/// postfix-expression '->' identifier 1272/// postfix-expression '++' 1273/// postfix-expression '--' 1274/// '(' type-name ')' '{' initializer-list '}' 1275/// '(' type-name ')' '{' initializer-list ',' '}' 1276/// 1277/// argument-expression-list: [C99 6.5.2] 1278/// argument-expression ...[opt] 1279/// argument-expression-list ',' assignment-expression ...[opt] 1280/// \endverbatim 1281ExprResult 1282Parser::ParsePostfixExpressionSuffix(ExprResult LHS) { 1283 // Now that the primary-expression piece of the postfix-expression has been 1284 // parsed, see if there are any postfix-expression pieces here. 1285 SourceLocation Loc; 1286 while (1) { 1287 switch (Tok.getKind()) { 1288 case tok::code_completion: 1289 if (InMessageExpression) 1290 return LHS; 1291 1292 Actions.CodeCompletePostfixExpression(getCurScope(), LHS); 1293 cutOffParsing(); 1294 return ExprError(); 1295 1296 case tok::identifier: 1297 // If we see identifier: after an expression, and we're not already in a 1298 // message send, then this is probably a message send with a missing 1299 // opening bracket '['. 1300 if (getLangOpts().ObjC1 && !InMessageExpression && 1301 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) { 1302 LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 1303 ParsedType(), LHS.get()); 1304 break; 1305 } 1306 1307 // Fall through; this isn't a message send. 1308 1309 default: // Not a postfix-expression suffix. 1310 return LHS; 1311 case tok::l_square: { // postfix-expression: p-e '[' expression ']' 1312 // If we have a array postfix expression that starts on a new line and 1313 // Objective-C is enabled, it is highly likely that the user forgot a 1314 // semicolon after the base expression and that the array postfix-expr is 1315 // actually another message send. In this case, do some look-ahead to see 1316 // if the contents of the square brackets are obviously not a valid 1317 // expression and recover by pretending there is no suffix. 1318 if (getLangOpts().ObjC1 && Tok.isAtStartOfLine() && 1319 isSimpleObjCMessageExpression()) 1320 return LHS; 1321 1322 // Reject array indices starting with a lambda-expression. '[[' is 1323 // reserved for attributes. 1324 if (CheckProhibitedCXX11Attribute()) 1325 return ExprError(); 1326 1327 BalancedDelimiterTracker T(*this, tok::l_square); 1328 T.consumeOpen(); 1329 Loc = T.getOpenLocation(); 1330 ExprResult Idx; 1331 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { 1332 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 1333 Idx = ParseBraceInitializer(); 1334 } else 1335 Idx = ParseExpression(); 1336 1337 SourceLocation RLoc = Tok.getLocation(); 1338 1339 if (!LHS.isInvalid() && !Idx.isInvalid() && Tok.is(tok::r_square)) { 1340 LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.take(), Loc, 1341 Idx.take(), RLoc); 1342 } else 1343 LHS = ExprError(); 1344 1345 // Match the ']'. 1346 T.consumeClose(); 1347 break; 1348 } 1349 1350 case tok::l_paren: // p-e: p-e '(' argument-expression-list[opt] ')' 1351 case tok::lesslessless: { // p-e: p-e '<<<' argument-expression-list '>>>' 1352 // '(' argument-expression-list[opt] ')' 1353 tok::TokenKind OpKind = Tok.getKind(); 1354 InMessageExpressionRAIIObject InMessage(*this, false); 1355 1356 Expr *ExecConfig = 0; 1357 1358 BalancedDelimiterTracker PT(*this, tok::l_paren); 1359 1360 if (OpKind == tok::lesslessless) { 1361 ExprVector ExecConfigExprs; 1362 CommaLocsTy ExecConfigCommaLocs; 1363 SourceLocation OpenLoc = ConsumeToken(); 1364 1365 if (ParseExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) { 1366 LHS = ExprError(); 1367 } 1368 1369 SourceLocation CloseLoc = Tok.getLocation(); 1370 if (Tok.is(tok::greatergreatergreater)) { 1371 ConsumeToken(); 1372 } else if (LHS.isInvalid()) { 1373 SkipUntil(tok::greatergreatergreater); 1374 } else { 1375 // There was an error closing the brackets 1376 Diag(Tok, diag::err_expected_ggg); 1377 Diag(OpenLoc, diag::note_matching) << "<<<"; 1378 SkipUntil(tok::greatergreatergreater); 1379 LHS = ExprError(); 1380 } 1381 1382 if (!LHS.isInvalid()) { 1383 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen, "")) 1384 LHS = ExprError(); 1385 else 1386 Loc = PrevTokLocation; 1387 } 1388 1389 if (!LHS.isInvalid()) { 1390 ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(), 1391 OpenLoc, 1392 ExecConfigExprs, 1393 CloseLoc); 1394 if (ECResult.isInvalid()) 1395 LHS = ExprError(); 1396 else 1397 ExecConfig = ECResult.get(); 1398 } 1399 } else { 1400 PT.consumeOpen(); 1401 Loc = PT.getOpenLocation(); 1402 } 1403 1404 ExprVector ArgExprs; 1405 CommaLocsTy CommaLocs; 1406 1407 if (Tok.is(tok::code_completion)) { 1408 Actions.CodeCompleteCall(getCurScope(), LHS.get(), 1409 ArrayRef<Expr *>()); 1410 cutOffParsing(); 1411 return ExprError(); 1412 } 1413 1414 if (OpKind == tok::l_paren || !LHS.isInvalid()) { 1415 if (Tok.isNot(tok::r_paren)) { 1416 if (ParseExpressionList(ArgExprs, CommaLocs, &Sema::CodeCompleteCall, 1417 LHS.get())) { 1418 LHS = ExprError(); 1419 } 1420 } 1421 } 1422 1423 // Match the ')'. 1424 if (LHS.isInvalid()) { 1425 SkipUntil(tok::r_paren); 1426 } else if (Tok.isNot(tok::r_paren)) { 1427 PT.consumeClose(); 1428 LHS = ExprError(); 1429 } else { 1430 assert((ArgExprs.size() == 0 || 1431 ArgExprs.size()-1 == CommaLocs.size())&& 1432 "Unexpected number of commas!"); 1433 LHS = Actions.ActOnCallExpr(getCurScope(), LHS.take(), Loc, 1434 ArgExprs, Tok.getLocation(), 1435 ExecConfig); 1436 PT.consumeClose(); 1437 } 1438 1439 break; 1440 } 1441 case tok::arrow: 1442 case tok::period: { 1443 // postfix-expression: p-e '->' template[opt] id-expression 1444 // postfix-expression: p-e '.' template[opt] id-expression 1445 tok::TokenKind OpKind = Tok.getKind(); 1446 SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token. 1447 1448 CXXScopeSpec SS; 1449 ParsedType ObjectType; 1450 bool MayBePseudoDestructor = false; 1451 if (getLangOpts().CPlusPlus && !LHS.isInvalid()) { 1452 LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), LHS.take(), 1453 OpLoc, OpKind, ObjectType, 1454 MayBePseudoDestructor); 1455 if (LHS.isInvalid()) 1456 break; 1457 1458 ParseOptionalCXXScopeSpecifier(SS, ObjectType, 1459 /*EnteringContext=*/false, 1460 &MayBePseudoDestructor); 1461 if (SS.isNotEmpty()) 1462 ObjectType = ParsedType(); 1463 } 1464 1465 if (Tok.is(tok::code_completion)) { 1466 // Code completion for a member access expression. 1467 Actions.CodeCompleteMemberReferenceExpr(getCurScope(), LHS.get(), 1468 OpLoc, OpKind == tok::arrow); 1469 1470 cutOffParsing(); 1471 return ExprError(); 1472 } 1473 1474 if (MayBePseudoDestructor && !LHS.isInvalid()) { 1475 LHS = ParseCXXPseudoDestructor(LHS.take(), OpLoc, OpKind, SS, 1476 ObjectType); 1477 break; 1478 } 1479 1480 // Either the action has told is that this cannot be a 1481 // pseudo-destructor expression (based on the type of base 1482 // expression), or we didn't see a '~' in the right place. We 1483 // can still parse a destructor name here, but in that case it 1484 // names a real destructor. 1485 // Allow explicit constructor calls in Microsoft mode. 1486 // FIXME: Add support for explicit call of template constructor. 1487 SourceLocation TemplateKWLoc; 1488 UnqualifiedId Name; 1489 if (getLangOpts().ObjC2 && OpKind == tok::period && Tok.is(tok::kw_class)) { 1490 // Objective-C++: 1491 // After a '.' in a member access expression, treat the keyword 1492 // 'class' as if it were an identifier. 1493 // 1494 // This hack allows property access to the 'class' method because it is 1495 // such a common method name. For other C++ keywords that are 1496 // Objective-C method names, one must use the message send syntax. 1497 IdentifierInfo *Id = Tok.getIdentifierInfo(); 1498 SourceLocation Loc = ConsumeToken(); 1499 Name.setIdentifier(Id, Loc); 1500 } else if (ParseUnqualifiedId(SS, 1501 /*EnteringContext=*/false, 1502 /*AllowDestructorName=*/true, 1503 /*AllowConstructorName=*/ 1504 getLangOpts().MicrosoftExt, 1505 ObjectType, TemplateKWLoc, Name)) 1506 LHS = ExprError(); 1507 1508 if (!LHS.isInvalid()) 1509 LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.take(), OpLoc, 1510 OpKind, SS, TemplateKWLoc, Name, 1511 CurParsedObjCImpl ? CurParsedObjCImpl->Dcl : 0, 1512 Tok.is(tok::l_paren)); 1513 break; 1514 } 1515 case tok::plusplus: // postfix-expression: postfix-expression '++' 1516 case tok::minusminus: // postfix-expression: postfix-expression '--' 1517 if (!LHS.isInvalid()) { 1518 LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(), 1519 Tok.getKind(), LHS.take()); 1520 } 1521 ConsumeToken(); 1522 break; 1523 } 1524 } 1525} 1526 1527/// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/ 1528/// vec_step and we are at the start of an expression or a parenthesized 1529/// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the 1530/// expression (isCastExpr == false) or the type (isCastExpr == true). 1531/// 1532/// \verbatim 1533/// unary-expression: [C99 6.5.3] 1534/// 'sizeof' unary-expression 1535/// 'sizeof' '(' type-name ')' 1536/// [GNU] '__alignof' unary-expression 1537/// [GNU] '__alignof' '(' type-name ')' 1538/// [C11] '_Alignof' '(' type-name ')' 1539/// [C++0x] 'alignof' '(' type-id ')' 1540/// 1541/// [GNU] typeof-specifier: 1542/// typeof ( expressions ) 1543/// typeof ( type-name ) 1544/// [GNU/C++] typeof unary-expression 1545/// 1546/// [OpenCL 1.1 6.11.12] vec_step built-in function: 1547/// vec_step ( expressions ) 1548/// vec_step ( type-name ) 1549/// \endverbatim 1550ExprResult 1551Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok, 1552 bool &isCastExpr, 1553 ParsedType &CastTy, 1554 SourceRange &CastRange) { 1555 1556 assert((OpTok.is(tok::kw_typeof) || OpTok.is(tok::kw_sizeof) || 1557 OpTok.is(tok::kw___alignof) || OpTok.is(tok::kw_alignof) || 1558 OpTok.is(tok::kw__Alignof) || OpTok.is(tok::kw_vec_step)) && 1559 "Not a typeof/sizeof/alignof/vec_step expression!"); 1560 1561 ExprResult Operand; 1562 1563 // If the operand doesn't start with an '(', it must be an expression. 1564 if (Tok.isNot(tok::l_paren)) { 1565 isCastExpr = false; 1566 if (OpTok.is(tok::kw_typeof) && !getLangOpts().CPlusPlus) { 1567 Diag(Tok,diag::err_expected_lparen_after_id) << OpTok.getIdentifierInfo(); 1568 return ExprError(); 1569 } 1570 1571 Operand = ParseCastExpression(true/*isUnaryExpression*/); 1572 } else { 1573 // If it starts with a '(', we know that it is either a parenthesized 1574 // type-name, or it is a unary-expression that starts with a compound 1575 // literal, or starts with a primary-expression that is a parenthesized 1576 // expression. 1577 ParenParseOption ExprType = CastExpr; 1578 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc; 1579 1580 Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/, 1581 false, CastTy, RParenLoc); 1582 CastRange = SourceRange(LParenLoc, RParenLoc); 1583 1584 // If ParseParenExpression parsed a '(typename)' sequence only, then this is 1585 // a type. 1586 if (ExprType == CastExpr) { 1587 isCastExpr = true; 1588 return ExprEmpty(); 1589 } 1590 1591 if (getLangOpts().CPlusPlus || OpTok.isNot(tok::kw_typeof)) { 1592 // GNU typeof in C requires the expression to be parenthesized. Not so for 1593 // sizeof/alignof or in C++. Therefore, the parenthesized expression is 1594 // the start of a unary-expression, but doesn't include any postfix 1595 // pieces. Parse these now if present. 1596 if (!Operand.isInvalid()) 1597 Operand = ParsePostfixExpressionSuffix(Operand.get()); 1598 } 1599 } 1600 1601 // If we get here, the operand to the typeof/sizeof/alignof was an expresion. 1602 isCastExpr = false; 1603 return Operand; 1604} 1605 1606 1607/// \brief Parse a sizeof or alignof expression. 1608/// 1609/// \verbatim 1610/// unary-expression: [C99 6.5.3] 1611/// 'sizeof' unary-expression 1612/// 'sizeof' '(' type-name ')' 1613/// [C++11] 'sizeof' '...' '(' identifier ')' 1614/// [GNU] '__alignof' unary-expression 1615/// [GNU] '__alignof' '(' type-name ')' 1616/// [C11] '_Alignof' '(' type-name ')' 1617/// [C++11] 'alignof' '(' type-id ')' 1618/// \endverbatim 1619ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() { 1620 assert((Tok.is(tok::kw_sizeof) || Tok.is(tok::kw___alignof) || 1621 Tok.is(tok::kw_alignof) || Tok.is(tok::kw__Alignof) || 1622 Tok.is(tok::kw_vec_step)) && 1623 "Not a sizeof/alignof/vec_step expression!"); 1624 Token OpTok = Tok; 1625 ConsumeToken(); 1626 1627 // [C++11] 'sizeof' '...' '(' identifier ')' 1628 if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) { 1629 SourceLocation EllipsisLoc = ConsumeToken(); 1630 SourceLocation LParenLoc, RParenLoc; 1631 IdentifierInfo *Name = 0; 1632 SourceLocation NameLoc; 1633 if (Tok.is(tok::l_paren)) { 1634 BalancedDelimiterTracker T(*this, tok::l_paren); 1635 T.consumeOpen(); 1636 LParenLoc = T.getOpenLocation(); 1637 if (Tok.is(tok::identifier)) { 1638 Name = Tok.getIdentifierInfo(); 1639 NameLoc = ConsumeToken(); 1640 T.consumeClose(); 1641 RParenLoc = T.getCloseLocation(); 1642 if (RParenLoc.isInvalid()) 1643 RParenLoc = PP.getLocForEndOfToken(NameLoc); 1644 } else { 1645 Diag(Tok, diag::err_expected_parameter_pack); 1646 SkipUntil(tok::r_paren); 1647 } 1648 } else if (Tok.is(tok::identifier)) { 1649 Name = Tok.getIdentifierInfo(); 1650 NameLoc = ConsumeToken(); 1651 LParenLoc = PP.getLocForEndOfToken(EllipsisLoc); 1652 RParenLoc = PP.getLocForEndOfToken(NameLoc); 1653 Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack) 1654 << Name 1655 << FixItHint::CreateInsertion(LParenLoc, "(") 1656 << FixItHint::CreateInsertion(RParenLoc, ")"); 1657 } else { 1658 Diag(Tok, diag::err_sizeof_parameter_pack); 1659 } 1660 1661 if (!Name) 1662 return ExprError(); 1663 1664 return Actions.ActOnSizeofParameterPackExpr(getCurScope(), 1665 OpTok.getLocation(), 1666 *Name, NameLoc, 1667 RParenLoc); 1668 } 1669 1670 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof)) 1671 Diag(OpTok, diag::warn_cxx98_compat_alignof); 1672 1673 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated, 1674 Sema::ReuseLambdaContextDecl); 1675 1676 bool isCastExpr; 1677 ParsedType CastTy; 1678 SourceRange CastRange; 1679 ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok, 1680 isCastExpr, 1681 CastTy, 1682 CastRange); 1683 1684 UnaryExprOrTypeTrait ExprKind = UETT_SizeOf; 1685 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw___alignof) || 1686 OpTok.is(tok::kw__Alignof)) 1687 ExprKind = UETT_AlignOf; 1688 else if (OpTok.is(tok::kw_vec_step)) 1689 ExprKind = UETT_VecStep; 1690 1691 if (isCastExpr) 1692 return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(), 1693 ExprKind, 1694 /*isType=*/true, 1695 CastTy.getAsOpaquePtr(), 1696 CastRange); 1697 1698 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof)) 1699 Diag(OpTok, diag::ext_alignof_expr) << OpTok.getIdentifierInfo(); 1700 1701 // If we get here, the operand to the sizeof/alignof was an expresion. 1702 if (!Operand.isInvalid()) 1703 Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(), 1704 ExprKind, 1705 /*isType=*/false, 1706 Operand.release(), 1707 CastRange); 1708 return Operand; 1709} 1710 1711/// ParseBuiltinPrimaryExpression 1712/// 1713/// \verbatim 1714/// primary-expression: [C99 6.5.1] 1715/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 1716/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 1717/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 1718/// assign-expr ')' 1719/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 1720/// [OCL] '__builtin_astype' '(' assignment-expression ',' type-name ')' 1721/// 1722/// [GNU] offsetof-member-designator: 1723/// [GNU] identifier 1724/// [GNU] offsetof-member-designator '.' identifier 1725/// [GNU] offsetof-member-designator '[' expression ']' 1726/// \endverbatim 1727ExprResult Parser::ParseBuiltinPrimaryExpression() { 1728 ExprResult Res; 1729 const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo(); 1730 1731 tok::TokenKind T = Tok.getKind(); 1732 SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier. 1733 1734 // All of these start with an open paren. 1735 if (Tok.isNot(tok::l_paren)) 1736 return ExprError(Diag(Tok, diag::err_expected_lparen_after_id) 1737 << BuiltinII); 1738 1739 BalancedDelimiterTracker PT(*this, tok::l_paren); 1740 PT.consumeOpen(); 1741 1742 // TODO: Build AST. 1743 1744 switch (T) { 1745 default: llvm_unreachable("Not a builtin primary expression!"); 1746 case tok::kw___builtin_va_arg: { 1747 ExprResult Expr(ParseAssignmentExpression()); 1748 1749 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1750 Expr = ExprError(); 1751 1752 TypeResult Ty = ParseTypeName(); 1753 1754 if (Tok.isNot(tok::r_paren)) { 1755 Diag(Tok, diag::err_expected_rparen); 1756 Expr = ExprError(); 1757 } 1758 1759 if (Expr.isInvalid() || Ty.isInvalid()) 1760 Res = ExprError(); 1761 else 1762 Res = Actions.ActOnVAArg(StartLoc, Expr.take(), Ty.get(), ConsumeParen()); 1763 break; 1764 } 1765 case tok::kw___builtin_offsetof: { 1766 SourceLocation TypeLoc = Tok.getLocation(); 1767 TypeResult Ty = ParseTypeName(); 1768 if (Ty.isInvalid()) { 1769 SkipUntil(tok::r_paren); 1770 return ExprError(); 1771 } 1772 1773 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1774 return ExprError(); 1775 1776 // We must have at least one identifier here. 1777 if (Tok.isNot(tok::identifier)) { 1778 Diag(Tok, diag::err_expected_ident); 1779 SkipUntil(tok::r_paren); 1780 return ExprError(); 1781 } 1782 1783 // Keep track of the various subcomponents we see. 1784 SmallVector<Sema::OffsetOfComponent, 4> Comps; 1785 1786 Comps.push_back(Sema::OffsetOfComponent()); 1787 Comps.back().isBrackets = false; 1788 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1789 Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken(); 1790 1791 // FIXME: This loop leaks the index expressions on error. 1792 while (1) { 1793 if (Tok.is(tok::period)) { 1794 // offsetof-member-designator: offsetof-member-designator '.' identifier 1795 Comps.push_back(Sema::OffsetOfComponent()); 1796 Comps.back().isBrackets = false; 1797 Comps.back().LocStart = ConsumeToken(); 1798 1799 if (Tok.isNot(tok::identifier)) { 1800 Diag(Tok, diag::err_expected_ident); 1801 SkipUntil(tok::r_paren); 1802 return ExprError(); 1803 } 1804 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1805 Comps.back().LocEnd = ConsumeToken(); 1806 1807 } else if (Tok.is(tok::l_square)) { 1808 if (CheckProhibitedCXX11Attribute()) 1809 return ExprError(); 1810 1811 // offsetof-member-designator: offsetof-member-design '[' expression ']' 1812 Comps.push_back(Sema::OffsetOfComponent()); 1813 Comps.back().isBrackets = true; 1814 BalancedDelimiterTracker ST(*this, tok::l_square); 1815 ST.consumeOpen(); 1816 Comps.back().LocStart = ST.getOpenLocation(); 1817 Res = ParseExpression(); 1818 if (Res.isInvalid()) { 1819 SkipUntil(tok::r_paren); 1820 return Res; 1821 } 1822 Comps.back().U.E = Res.release(); 1823 1824 ST.consumeClose(); 1825 Comps.back().LocEnd = ST.getCloseLocation(); 1826 } else { 1827 if (Tok.isNot(tok::r_paren)) { 1828 PT.consumeClose(); 1829 Res = ExprError(); 1830 } else if (Ty.isInvalid()) { 1831 Res = ExprError(); 1832 } else { 1833 PT.consumeClose(); 1834 Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc, 1835 Ty.get(), &Comps[0], Comps.size(), 1836 PT.getCloseLocation()); 1837 } 1838 break; 1839 } 1840 } 1841 break; 1842 } 1843 case tok::kw___builtin_choose_expr: { 1844 ExprResult Cond(ParseAssignmentExpression()); 1845 if (Cond.isInvalid()) { 1846 SkipUntil(tok::r_paren); 1847 return Cond; 1848 } 1849 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1850 return ExprError(); 1851 1852 ExprResult Expr1(ParseAssignmentExpression()); 1853 if (Expr1.isInvalid()) { 1854 SkipUntil(tok::r_paren); 1855 return Expr1; 1856 } 1857 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1858 return ExprError(); 1859 1860 ExprResult Expr2(ParseAssignmentExpression()); 1861 if (Expr2.isInvalid()) { 1862 SkipUntil(tok::r_paren); 1863 return Expr2; 1864 } 1865 if (Tok.isNot(tok::r_paren)) { 1866 Diag(Tok, diag::err_expected_rparen); 1867 return ExprError(); 1868 } 1869 Res = Actions.ActOnChooseExpr(StartLoc, Cond.take(), Expr1.take(), 1870 Expr2.take(), ConsumeParen()); 1871 break; 1872 } 1873 case tok::kw___builtin_astype: { 1874 // The first argument is an expression to be converted, followed by a comma. 1875 ExprResult Expr(ParseAssignmentExpression()); 1876 if (Expr.isInvalid()) { 1877 SkipUntil(tok::r_paren); 1878 return ExprError(); 1879 } 1880 1881 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", 1882 tok::r_paren)) 1883 return ExprError(); 1884 1885 // Second argument is the type to bitcast to. 1886 TypeResult DestTy = ParseTypeName(); 1887 if (DestTy.isInvalid()) 1888 return ExprError(); 1889 1890 // Attempt to consume the r-paren. 1891 if (Tok.isNot(tok::r_paren)) { 1892 Diag(Tok, diag::err_expected_rparen); 1893 SkipUntil(tok::r_paren); 1894 return ExprError(); 1895 } 1896 1897 Res = Actions.ActOnAsTypeExpr(Expr.take(), DestTy.get(), StartLoc, 1898 ConsumeParen()); 1899 break; 1900 } 1901 } 1902 1903 if (Res.isInvalid()) 1904 return ExprError(); 1905 1906 // These can be followed by postfix-expr pieces because they are 1907 // primary-expressions. 1908 return ParsePostfixExpressionSuffix(Res.take()); 1909} 1910 1911/// ParseParenExpression - This parses the unit that starts with a '(' token, 1912/// based on what is allowed by ExprType. The actual thing parsed is returned 1913/// in ExprType. If stopIfCastExpr is true, it will only return the parsed type, 1914/// not the parsed cast-expression. 1915/// 1916/// \verbatim 1917/// primary-expression: [C99 6.5.1] 1918/// '(' expression ')' 1919/// [GNU] '(' compound-statement ')' (if !ParenExprOnly) 1920/// postfix-expression: [C99 6.5.2] 1921/// '(' type-name ')' '{' initializer-list '}' 1922/// '(' type-name ')' '{' initializer-list ',' '}' 1923/// cast-expression: [C99 6.5.4] 1924/// '(' type-name ')' cast-expression 1925/// [ARC] bridged-cast-expression 1926/// 1927/// [ARC] bridged-cast-expression: 1928/// (__bridge type-name) cast-expression 1929/// (__bridge_transfer type-name) cast-expression 1930/// (__bridge_retained type-name) cast-expression 1931/// \endverbatim 1932ExprResult 1933Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr, 1934 bool isTypeCast, ParsedType &CastTy, 1935 SourceLocation &RParenLoc) { 1936 assert(Tok.is(tok::l_paren) && "Not a paren expr!"); 1937 BalancedDelimiterTracker T(*this, tok::l_paren); 1938 if (T.consumeOpen()) 1939 return ExprError(); 1940 SourceLocation OpenLoc = T.getOpenLocation(); 1941 1942 ExprResult Result(true); 1943 bool isAmbiguousTypeId; 1944 CastTy = ParsedType(); 1945 1946 if (Tok.is(tok::code_completion)) { 1947 Actions.CodeCompleteOrdinaryName(getCurScope(), 1948 ExprType >= CompoundLiteral? Sema::PCC_ParenthesizedExpression 1949 : Sema::PCC_Expression); 1950 cutOffParsing(); 1951 return ExprError(); 1952 } 1953 1954 // Diagnose use of bridge casts in non-arc mode. 1955 bool BridgeCast = (getLangOpts().ObjC2 && 1956 (Tok.is(tok::kw___bridge) || 1957 Tok.is(tok::kw___bridge_transfer) || 1958 Tok.is(tok::kw___bridge_retained) || 1959 Tok.is(tok::kw___bridge_retain))); 1960 if (BridgeCast && !getLangOpts().ObjCAutoRefCount) { 1961 StringRef BridgeCastName = Tok.getName(); 1962 SourceLocation BridgeKeywordLoc = ConsumeToken(); 1963 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc)) 1964 Diag(BridgeKeywordLoc, diag::warn_arc_bridge_cast_nonarc) 1965 << BridgeCastName 1966 << FixItHint::CreateReplacement(BridgeKeywordLoc, ""); 1967 BridgeCast = false; 1968 } 1969 1970 // None of these cases should fall through with an invalid Result 1971 // unless they've already reported an error. 1972 if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) { 1973 Diag(Tok, diag::ext_gnu_statement_expr); 1974 Actions.ActOnStartStmtExpr(); 1975 1976 StmtResult Stmt(ParseCompoundStatement(true)); 1977 ExprType = CompoundStmt; 1978 1979 // If the substmt parsed correctly, build the AST node. 1980 if (!Stmt.isInvalid()) { 1981 Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.take(), Tok.getLocation()); 1982 } else { 1983 Actions.ActOnStmtExprError(); 1984 } 1985 } else if (ExprType >= CompoundLiteral && BridgeCast) { 1986 tok::TokenKind tokenKind = Tok.getKind(); 1987 SourceLocation BridgeKeywordLoc = ConsumeToken(); 1988 1989 // Parse an Objective-C ARC ownership cast expression. 1990 ObjCBridgeCastKind Kind; 1991 if (tokenKind == tok::kw___bridge) 1992 Kind = OBC_Bridge; 1993 else if (tokenKind == tok::kw___bridge_transfer) 1994 Kind = OBC_BridgeTransfer; 1995 else if (tokenKind == tok::kw___bridge_retained) 1996 Kind = OBC_BridgeRetained; 1997 else { 1998 // As a hopefully temporary workaround, allow __bridge_retain as 1999 // a synonym for __bridge_retained, but only in system headers. 2000 assert(tokenKind == tok::kw___bridge_retain); 2001 Kind = OBC_BridgeRetained; 2002 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc)) 2003 Diag(BridgeKeywordLoc, diag::err_arc_bridge_retain) 2004 << FixItHint::CreateReplacement(BridgeKeywordLoc, 2005 "__bridge_retained"); 2006 } 2007 2008 TypeResult Ty = ParseTypeName(); 2009 T.consumeClose(); 2010 RParenLoc = T.getCloseLocation(); 2011 ExprResult SubExpr = ParseCastExpression(/*isUnaryExpression=*/false); 2012 2013 if (Ty.isInvalid() || SubExpr.isInvalid()) 2014 return ExprError(); 2015 2016 return Actions.ActOnObjCBridgedCast(getCurScope(), OpenLoc, Kind, 2017 BridgeKeywordLoc, Ty.get(), 2018 RParenLoc, SubExpr.get()); 2019 } else if (ExprType >= CompoundLiteral && 2020 isTypeIdInParens(isAmbiguousTypeId)) { 2021 2022 // Otherwise, this is a compound literal expression or cast expression. 2023 2024 // In C++, if the type-id is ambiguous we disambiguate based on context. 2025 // If stopIfCastExpr is true the context is a typeof/sizeof/alignof 2026 // in which case we should treat it as type-id. 2027 // if stopIfCastExpr is false, we need to determine the context past the 2028 // parens, so we defer to ParseCXXAmbiguousParenExpression for that. 2029 if (isAmbiguousTypeId && !stopIfCastExpr) { 2030 ExprResult res = ParseCXXAmbiguousParenExpression(ExprType, CastTy, T); 2031 RParenLoc = T.getCloseLocation(); 2032 return res; 2033 } 2034 2035 // Parse the type declarator. 2036 DeclSpec DS(AttrFactory); 2037 ParseSpecifierQualifierList(DS); 2038 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 2039 ParseDeclarator(DeclaratorInfo); 2040 2041 // If our type is followed by an identifier and either ':' or ']', then 2042 // this is probably an Objective-C message send where the leading '[' is 2043 // missing. Recover as if that were the case. 2044 if (!DeclaratorInfo.isInvalidType() && Tok.is(tok::identifier) && 2045 !InMessageExpression && getLangOpts().ObjC1 && 2046 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) { 2047 TypeResult Ty; 2048 { 2049 InMessageExpressionRAIIObject InMessage(*this, false); 2050 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 2051 } 2052 Result = ParseObjCMessageExpressionBody(SourceLocation(), 2053 SourceLocation(), 2054 Ty.get(), 0); 2055 } else { 2056 // Match the ')'. 2057 T.consumeClose(); 2058 RParenLoc = T.getCloseLocation(); 2059 if (Tok.is(tok::l_brace)) { 2060 ExprType = CompoundLiteral; 2061 TypeResult Ty; 2062 { 2063 InMessageExpressionRAIIObject InMessage(*this, false); 2064 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 2065 } 2066 return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc); 2067 } 2068 2069 if (ExprType == CastExpr) { 2070 // We parsed '(' type-name ')' and the thing after it wasn't a '{'. 2071 2072 if (DeclaratorInfo.isInvalidType()) 2073 return ExprError(); 2074 2075 // Note that this doesn't parse the subsequent cast-expression, it just 2076 // returns the parsed type to the callee. 2077 if (stopIfCastExpr) { 2078 TypeResult Ty; 2079 { 2080 InMessageExpressionRAIIObject InMessage(*this, false); 2081 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 2082 } 2083 CastTy = Ty.get(); 2084 return ExprResult(); 2085 } 2086 2087 // Reject the cast of super idiom in ObjC. 2088 if (Tok.is(tok::identifier) && getLangOpts().ObjC1 && 2089 Tok.getIdentifierInfo() == Ident_super && 2090 getCurScope()->isInObjcMethodScope() && 2091 GetLookAheadToken(1).isNot(tok::period)) { 2092 Diag(Tok.getLocation(), diag::err_illegal_super_cast) 2093 << SourceRange(OpenLoc, RParenLoc); 2094 return ExprError(); 2095 } 2096 2097 // Parse the cast-expression that follows it next. 2098 // TODO: For cast expression with CastTy. 2099 Result = ParseCastExpression(/*isUnaryExpression=*/false, 2100 /*isAddressOfOperand=*/false, 2101 /*isTypeCast=*/IsTypeCast); 2102 if (!Result.isInvalid()) { 2103 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc, 2104 DeclaratorInfo, CastTy, 2105 RParenLoc, Result.take()); 2106 } 2107 return Result; 2108 } 2109 2110 Diag(Tok, diag::err_expected_lbrace_in_compound_literal); 2111 return ExprError(); 2112 } 2113 } else if (isTypeCast) { 2114 // Parse the expression-list. 2115 InMessageExpressionRAIIObject InMessage(*this, false); 2116 2117 ExprVector ArgExprs; 2118 CommaLocsTy CommaLocs; 2119 2120 if (!ParseExpressionList(ArgExprs, CommaLocs)) { 2121 ExprType = SimpleExpr; 2122 Result = Actions.ActOnParenListExpr(OpenLoc, Tok.getLocation(), 2123 ArgExprs); 2124 } 2125 } else { 2126 InMessageExpressionRAIIObject InMessage(*this, false); 2127 2128 Result = ParseExpression(MaybeTypeCast); 2129 ExprType = SimpleExpr; 2130 2131 // Don't build a paren expression unless we actually match a ')'. 2132 if (!Result.isInvalid() && Tok.is(tok::r_paren)) 2133 Result = Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.take()); 2134 } 2135 2136 // Match the ')'. 2137 if (Result.isInvalid()) { 2138 SkipUntil(tok::r_paren); 2139 return ExprError(); 2140 } 2141 2142 T.consumeClose(); 2143 RParenLoc = T.getCloseLocation(); 2144 return Result; 2145} 2146 2147/// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name 2148/// and we are at the left brace. 2149/// 2150/// \verbatim 2151/// postfix-expression: [C99 6.5.2] 2152/// '(' type-name ')' '{' initializer-list '}' 2153/// '(' type-name ')' '{' initializer-list ',' '}' 2154/// \endverbatim 2155ExprResult 2156Parser::ParseCompoundLiteralExpression(ParsedType Ty, 2157 SourceLocation LParenLoc, 2158 SourceLocation RParenLoc) { 2159 assert(Tok.is(tok::l_brace) && "Not a compound literal!"); 2160 if (!getLangOpts().C99) // Compound literals don't exist in C90. 2161 Diag(LParenLoc, diag::ext_c99_compound_literal); 2162 ExprResult Result = ParseInitializer(); 2163 if (!Result.isInvalid() && Ty) 2164 return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.take()); 2165 return Result; 2166} 2167 2168/// ParseStringLiteralExpression - This handles the various token types that 2169/// form string literals, and also handles string concatenation [C99 5.1.1.2, 2170/// translation phase #6]. 2171/// 2172/// \verbatim 2173/// primary-expression: [C99 6.5.1] 2174/// string-literal 2175/// \verbatim 2176ExprResult Parser::ParseStringLiteralExpression(bool AllowUserDefinedLiteral) { 2177 assert(isTokenStringLiteral() && "Not a string literal!"); 2178 2179 // String concat. Note that keywords like __func__ and __FUNCTION__ are not 2180 // considered to be strings for concatenation purposes. 2181 SmallVector<Token, 4> StringToks; 2182 2183 do { 2184 StringToks.push_back(Tok); 2185 ConsumeStringToken(); 2186 } while (isTokenStringLiteral()); 2187 2188 // Pass the set of string tokens, ready for concatenation, to the actions. 2189 return Actions.ActOnStringLiteral(&StringToks[0], StringToks.size(), 2190 AllowUserDefinedLiteral ? getCurScope() : 0); 2191} 2192 2193/// ParseGenericSelectionExpression - Parse a C11 generic-selection 2194/// [C11 6.5.1.1]. 2195/// 2196/// \verbatim 2197/// generic-selection: 2198/// _Generic ( assignment-expression , generic-assoc-list ) 2199/// generic-assoc-list: 2200/// generic-association 2201/// generic-assoc-list , generic-association 2202/// generic-association: 2203/// type-name : assignment-expression 2204/// default : assignment-expression 2205/// \endverbatim 2206ExprResult Parser::ParseGenericSelectionExpression() { 2207 assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected"); 2208 SourceLocation KeyLoc = ConsumeToken(); 2209 2210 if (!getLangOpts().C11) 2211 Diag(KeyLoc, diag::ext_c11_generic_selection); 2212 2213 BalancedDelimiterTracker T(*this, tok::l_paren); 2214 if (T.expectAndConsume(diag::err_expected_lparen)) 2215 return ExprError(); 2216 2217 ExprResult ControllingExpr; 2218 { 2219 // C11 6.5.1.1p3 "The controlling expression of a generic selection is 2220 // not evaluated." 2221 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2222 ControllingExpr = ParseAssignmentExpression(); 2223 if (ControllingExpr.isInvalid()) { 2224 SkipUntil(tok::r_paren); 2225 return ExprError(); 2226 } 2227 } 2228 2229 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "")) { 2230 SkipUntil(tok::r_paren); 2231 return ExprError(); 2232 } 2233 2234 SourceLocation DefaultLoc; 2235 TypeVector Types; 2236 ExprVector Exprs; 2237 while (1) { 2238 ParsedType Ty; 2239 if (Tok.is(tok::kw_default)) { 2240 // C11 6.5.1.1p2 "A generic selection shall have no more than one default 2241 // generic association." 2242 if (!DefaultLoc.isInvalid()) { 2243 Diag(Tok, diag::err_duplicate_default_assoc); 2244 Diag(DefaultLoc, diag::note_previous_default_assoc); 2245 SkipUntil(tok::r_paren); 2246 return ExprError(); 2247 } 2248 DefaultLoc = ConsumeToken(); 2249 Ty = ParsedType(); 2250 } else { 2251 ColonProtectionRAIIObject X(*this); 2252 TypeResult TR = ParseTypeName(); 2253 if (TR.isInvalid()) { 2254 SkipUntil(tok::r_paren); 2255 return ExprError(); 2256 } 2257 Ty = TR.release(); 2258 } 2259 Types.push_back(Ty); 2260 2261 if (ExpectAndConsume(tok::colon, diag::err_expected_colon, "")) { 2262 SkipUntil(tok::r_paren); 2263 return ExprError(); 2264 } 2265 2266 // FIXME: These expressions should be parsed in a potentially potentially 2267 // evaluated context. 2268 ExprResult ER(ParseAssignmentExpression()); 2269 if (ER.isInvalid()) { 2270 SkipUntil(tok::r_paren); 2271 return ExprError(); 2272 } 2273 Exprs.push_back(ER.release()); 2274 2275 if (Tok.isNot(tok::comma)) 2276 break; 2277 ConsumeToken(); 2278 } 2279 2280 T.consumeClose(); 2281 if (T.getCloseLocation().isInvalid()) 2282 return ExprError(); 2283 2284 return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc, 2285 T.getCloseLocation(), 2286 ControllingExpr.release(), 2287 Types, Exprs); 2288} 2289 2290/// ParseExpressionList - Used for C/C++ (argument-)expression-list. 2291/// 2292/// \verbatim 2293/// argument-expression-list: 2294/// assignment-expression 2295/// argument-expression-list , assignment-expression 2296/// 2297/// [C++] expression-list: 2298/// [C++] assignment-expression 2299/// [C++] expression-list , assignment-expression 2300/// 2301/// [C++0x] expression-list: 2302/// [C++0x] initializer-list 2303/// 2304/// [C++0x] initializer-list 2305/// [C++0x] initializer-clause ...[opt] 2306/// [C++0x] initializer-list , initializer-clause ...[opt] 2307/// 2308/// [C++0x] initializer-clause: 2309/// [C++0x] assignment-expression 2310/// [C++0x] braced-init-list 2311/// \endverbatim 2312bool Parser::ParseExpressionList(SmallVectorImpl<Expr*> &Exprs, 2313 SmallVectorImpl<SourceLocation> &CommaLocs, 2314 void (Sema::*Completer)(Scope *S, 2315 Expr *Data, 2316 ArrayRef<Expr *> Args), 2317 Expr *Data) { 2318 while (1) { 2319 if (Tok.is(tok::code_completion)) { 2320 if (Completer) 2321 (Actions.*Completer)(getCurScope(), Data, Exprs); 2322 else 2323 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 2324 cutOffParsing(); 2325 return true; 2326 } 2327 2328 ExprResult Expr; 2329 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) { 2330 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 2331 Expr = ParseBraceInitializer(); 2332 } else 2333 Expr = ParseAssignmentExpression(); 2334 2335 if (Tok.is(tok::ellipsis)) 2336 Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken()); 2337 if (Expr.isInvalid()) 2338 return true; 2339 2340 Exprs.push_back(Expr.release()); 2341 2342 if (Tok.isNot(tok::comma)) 2343 return false; 2344 // Move to the next argument, remember where the comma was. 2345 CommaLocs.push_back(ConsumeToken()); 2346 } 2347} 2348 2349/// ParseBlockId - Parse a block-id, which roughly looks like int (int x). 2350/// 2351/// \verbatim 2352/// [clang] block-id: 2353/// [clang] specifier-qualifier-list block-declarator 2354/// \endverbatim 2355void Parser::ParseBlockId(SourceLocation CaretLoc) { 2356 if (Tok.is(tok::code_completion)) { 2357 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type); 2358 return cutOffParsing(); 2359 } 2360 2361 // Parse the specifier-qualifier-list piece. 2362 DeclSpec DS(AttrFactory); 2363 ParseSpecifierQualifierList(DS); 2364 2365 // Parse the block-declarator. 2366 Declarator DeclaratorInfo(DS, Declarator::BlockLiteralContext); 2367 ParseDeclarator(DeclaratorInfo); 2368 2369 // We do this for: ^ __attribute__((noreturn)) {, as DS has the attributes. 2370 DeclaratorInfo.takeAttributes(DS.getAttributes(), SourceLocation()); 2371 2372 MaybeParseGNUAttributes(DeclaratorInfo); 2373 2374 // Inform sema that we are starting a block. 2375 Actions.ActOnBlockArguments(CaretLoc, DeclaratorInfo, getCurScope()); 2376} 2377 2378/// ParseBlockLiteralExpression - Parse a block literal, which roughly looks 2379/// like ^(int x){ return x+1; } 2380/// 2381/// \verbatim 2382/// block-literal: 2383/// [clang] '^' block-args[opt] compound-statement 2384/// [clang] '^' block-id compound-statement 2385/// [clang] block-args: 2386/// [clang] '(' parameter-list ')' 2387/// \endverbatim 2388ExprResult Parser::ParseBlockLiteralExpression() { 2389 assert(Tok.is(tok::caret) && "block literal starts with ^"); 2390 SourceLocation CaretLoc = ConsumeToken(); 2391 2392 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc, 2393 "block literal parsing"); 2394 2395 // Enter a scope to hold everything within the block. This includes the 2396 // argument decls, decls within the compound expression, etc. This also 2397 // allows determining whether a variable reference inside the block is 2398 // within or outside of the block. 2399 ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope | 2400 Scope::DeclScope); 2401 2402 // Inform sema that we are starting a block. 2403 Actions.ActOnBlockStart(CaretLoc, getCurScope()); 2404 2405 // Parse the return type if present. 2406 DeclSpec DS(AttrFactory); 2407 Declarator ParamInfo(DS, Declarator::BlockLiteralContext); 2408 // FIXME: Since the return type isn't actually parsed, it can't be used to 2409 // fill ParamInfo with an initial valid range, so do it manually. 2410 ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation())); 2411 2412 // If this block has arguments, parse them. There is no ambiguity here with 2413 // the expression case, because the expression case requires a parameter list. 2414 if (Tok.is(tok::l_paren)) { 2415 ParseParenDeclarator(ParamInfo); 2416 // Parse the pieces after the identifier as if we had "int(...)". 2417 // SetIdentifier sets the source range end, but in this case we're past 2418 // that location. 2419 SourceLocation Tmp = ParamInfo.getSourceRange().getEnd(); 2420 ParamInfo.SetIdentifier(0, CaretLoc); 2421 ParamInfo.SetRangeEnd(Tmp); 2422 if (ParamInfo.isInvalidType()) { 2423 // If there was an error parsing the arguments, they may have 2424 // tried to use ^(x+y) which requires an argument list. Just 2425 // skip the whole block literal. 2426 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2427 return ExprError(); 2428 } 2429 2430 MaybeParseGNUAttributes(ParamInfo); 2431 2432 // Inform sema that we are starting a block. 2433 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope()); 2434 } else if (!Tok.is(tok::l_brace)) { 2435 ParseBlockId(CaretLoc); 2436 } else { 2437 // Otherwise, pretend we saw (void). 2438 ParsedAttributes attrs(AttrFactory); 2439 SourceLocation NoLoc; 2440 ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/true, 2441 /*IsAmbiguous=*/false, 2442 /*RParenLoc=*/NoLoc, 2443 /*ArgInfo=*/0, 2444 /*NumArgs=*/0, 2445 /*EllipsisLoc=*/NoLoc, 2446 /*RParenLoc=*/NoLoc, 2447 /*TypeQuals=*/0, 2448 /*RefQualifierIsLvalueRef=*/true, 2449 /*RefQualifierLoc=*/NoLoc, 2450 /*ConstQualifierLoc=*/NoLoc, 2451 /*VolatileQualifierLoc=*/NoLoc, 2452 /*MutableLoc=*/NoLoc, 2453 EST_None, 2454 /*ESpecLoc=*/NoLoc, 2455 /*Exceptions=*/0, 2456 /*ExceptionRanges=*/0, 2457 /*NumExceptions=*/0, 2458 /*NoexceptExpr=*/0, 2459 CaretLoc, CaretLoc, 2460 ParamInfo), 2461 attrs, CaretLoc); 2462 2463 MaybeParseGNUAttributes(ParamInfo); 2464 2465 // Inform sema that we are starting a block. 2466 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope()); 2467 } 2468 2469 2470 ExprResult Result(true); 2471 if (!Tok.is(tok::l_brace)) { 2472 // Saw something like: ^expr 2473 Diag(Tok, diag::err_expected_expression); 2474 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2475 return ExprError(); 2476 } 2477 2478 StmtResult Stmt(ParseCompoundStatementBody()); 2479 BlockScope.Exit(); 2480 if (!Stmt.isInvalid()) 2481 Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.take(), getCurScope()); 2482 else 2483 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2484 return Result; 2485} 2486 2487/// ParseObjCBoolLiteral - This handles the objective-c Boolean literals. 2488/// 2489/// '__objc_yes' 2490/// '__objc_no' 2491ExprResult Parser::ParseObjCBoolLiteral() { 2492 tok::TokenKind Kind = Tok.getKind(); 2493 return Actions.ActOnObjCBoolLiteral(ConsumeToken(), Kind); 2494} 2495