ParseExpr.cpp revision 5b9cc5df25c2198f270dd1d5c438fdce70d4051d
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// This file implements the Expression parsing implementation. Expressions in 11// C99 basically consist of a bunch of binary operators with unary operators and 12// other random stuff at the leaves. 13// 14// In the C99 grammar, these unary operators bind tightest and are represented 15// as the 'cast-expression' production. Everything else is either a binary 16// operator (e.g. '/') or a ternary operator ("?:"). The unary leaves are 17// handled by ParseCastExpression, the higher level pieces are handled by 18// ParseBinaryExpression. 19// 20//===----------------------------------------------------------------------===// 21 22#include "clang/Parse/Parser.h" 23#include "clang/Sema/DeclSpec.h" 24#include "clang/Sema/Scope.h" 25#include "clang/Sema/ParsedTemplate.h" 26#include "clang/Sema/TypoCorrection.h" 27#include "clang/Basic/PrettyStackTrace.h" 28#include "RAIIObjectsForParser.h" 29#include "llvm/ADT/SmallVector.h" 30#include "llvm/ADT/SmallString.h" 31using namespace clang; 32 33/// getBinOpPrecedence - Return the precedence of the specified binary operator 34/// token. 35static prec::Level getBinOpPrecedence(tok::TokenKind Kind, 36 bool GreaterThanIsOperator, 37 bool CPlusPlus0x) { 38 switch (Kind) { 39 case tok::greater: 40 // C++ [temp.names]p3: 41 // [...] When parsing a template-argument-list, the first 42 // non-nested > is taken as the ending delimiter rather than a 43 // greater-than operator. [...] 44 if (GreaterThanIsOperator) 45 return prec::Relational; 46 return prec::Unknown; 47 48 case tok::greatergreater: 49 // C++0x [temp.names]p3: 50 // 51 // [...] Similarly, the first non-nested >> is treated as two 52 // consecutive but distinct > tokens, the first of which is 53 // taken as the end of the template-argument-list and completes 54 // the template-id. [...] 55 if (GreaterThanIsOperator || !CPlusPlus0x) 56 return prec::Shift; 57 return prec::Unknown; 58 59 default: return prec::Unknown; 60 case tok::comma: return prec::Comma; 61 case tok::equal: 62 case tok::starequal: 63 case tok::slashequal: 64 case tok::percentequal: 65 case tok::plusequal: 66 case tok::minusequal: 67 case tok::lesslessequal: 68 case tok::greatergreaterequal: 69 case tok::ampequal: 70 case tok::caretequal: 71 case tok::pipeequal: return prec::Assignment; 72 case tok::question: return prec::Conditional; 73 case tok::pipepipe: return prec::LogicalOr; 74 case tok::ampamp: return prec::LogicalAnd; 75 case tok::pipe: return prec::InclusiveOr; 76 case tok::caret: return prec::ExclusiveOr; 77 case tok::amp: return prec::And; 78 case tok::exclaimequal: 79 case tok::equalequal: return prec::Equality; 80 case tok::lessequal: 81 case tok::less: 82 case tok::greaterequal: return prec::Relational; 83 case tok::lessless: return prec::Shift; 84 case tok::plus: 85 case tok::minus: return prec::Additive; 86 case tok::percent: 87 case tok::slash: 88 case tok::star: return prec::Multiplicative; 89 case tok::periodstar: 90 case tok::arrowstar: return prec::PointerToMember; 91 } 92} 93 94 95/// ParseExpression - Simple precedence-based parser for binary/ternary 96/// operators. 97/// 98/// Note: we diverge from the C99 grammar when parsing the assignment-expression 99/// production. C99 specifies that the LHS of an assignment operator should be 100/// parsed as a unary-expression, but consistency dictates that it be a 101/// conditional-expession. In practice, the important thing here is that the 102/// LHS of an assignment has to be an l-value, which productions between 103/// unary-expression and conditional-expression don't produce. Because we want 104/// consistency, we parse the LHS as a conditional-expression, then check for 105/// l-value-ness in semantic analysis stages. 106/// 107/// pm-expression: [C++ 5.5] 108/// cast-expression 109/// pm-expression '.*' cast-expression 110/// pm-expression '->*' cast-expression 111/// 112/// multiplicative-expression: [C99 6.5.5] 113/// Note: in C++, apply pm-expression instead of cast-expression 114/// cast-expression 115/// multiplicative-expression '*' cast-expression 116/// multiplicative-expression '/' cast-expression 117/// multiplicative-expression '%' cast-expression 118/// 119/// additive-expression: [C99 6.5.6] 120/// multiplicative-expression 121/// additive-expression '+' multiplicative-expression 122/// additive-expression '-' multiplicative-expression 123/// 124/// shift-expression: [C99 6.5.7] 125/// additive-expression 126/// shift-expression '<<' additive-expression 127/// shift-expression '>>' additive-expression 128/// 129/// relational-expression: [C99 6.5.8] 130/// shift-expression 131/// relational-expression '<' shift-expression 132/// relational-expression '>' shift-expression 133/// relational-expression '<=' shift-expression 134/// relational-expression '>=' shift-expression 135/// 136/// equality-expression: [C99 6.5.9] 137/// relational-expression 138/// equality-expression '==' relational-expression 139/// equality-expression '!=' relational-expression 140/// 141/// AND-expression: [C99 6.5.10] 142/// equality-expression 143/// AND-expression '&' equality-expression 144/// 145/// exclusive-OR-expression: [C99 6.5.11] 146/// AND-expression 147/// exclusive-OR-expression '^' AND-expression 148/// 149/// inclusive-OR-expression: [C99 6.5.12] 150/// exclusive-OR-expression 151/// inclusive-OR-expression '|' exclusive-OR-expression 152/// 153/// logical-AND-expression: [C99 6.5.13] 154/// inclusive-OR-expression 155/// logical-AND-expression '&&' inclusive-OR-expression 156/// 157/// logical-OR-expression: [C99 6.5.14] 158/// logical-AND-expression 159/// logical-OR-expression '||' logical-AND-expression 160/// 161/// conditional-expression: [C99 6.5.15] 162/// logical-OR-expression 163/// logical-OR-expression '?' expression ':' conditional-expression 164/// [GNU] logical-OR-expression '?' ':' conditional-expression 165/// [C++] the third operand is an assignment-expression 166/// 167/// assignment-expression: [C99 6.5.16] 168/// conditional-expression 169/// unary-expression assignment-operator assignment-expression 170/// [C++] throw-expression [C++ 15] 171/// 172/// assignment-operator: one of 173/// = *= /= %= += -= <<= >>= &= ^= |= 174/// 175/// expression: [C99 6.5.17] 176/// assignment-expression ...[opt] 177/// expression ',' assignment-expression ...[opt] 178ExprResult Parser::ParseExpression(TypeCastState isTypeCast) { 179 ExprResult LHS(ParseAssignmentExpression(isTypeCast)); 180 return ParseRHSOfBinaryExpression(move(LHS), prec::Comma); 181} 182 183/// This routine is called when the '@' is seen and consumed. 184/// Current token is an Identifier and is not a 'try'. This 185/// routine is necessary to disambiguate @try-statement from, 186/// for example, @encode-expression. 187/// 188ExprResult 189Parser::ParseExpressionWithLeadingAt(SourceLocation AtLoc) { 190 ExprResult LHS(ParseObjCAtExpression(AtLoc)); 191 return ParseRHSOfBinaryExpression(move(LHS), prec::Comma); 192} 193 194/// This routine is called when a leading '__extension__' is seen and 195/// consumed. This is necessary because the token gets consumed in the 196/// process of disambiguating between an expression and a declaration. 197ExprResult 198Parser::ParseExpressionWithLeadingExtension(SourceLocation ExtLoc) { 199 ExprResult LHS(true); 200 { 201 // Silence extension warnings in the sub-expression 202 ExtensionRAIIObject O(Diags); 203 204 LHS = ParseCastExpression(false); 205 } 206 207 if (!LHS.isInvalid()) 208 LHS = Actions.ActOnUnaryOp(getCurScope(), ExtLoc, tok::kw___extension__, 209 LHS.take()); 210 211 return ParseRHSOfBinaryExpression(move(LHS), prec::Comma); 212} 213 214/// ParseAssignmentExpression - Parse an expr that doesn't include commas. 215ExprResult Parser::ParseAssignmentExpression(TypeCastState isTypeCast) { 216 if (Tok.is(tok::code_completion)) { 217 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 218 cutOffParsing(); 219 return ExprError(); 220 } 221 222 if (Tok.is(tok::kw_throw)) 223 return ParseThrowExpression(); 224 225 ExprResult LHS = ParseCastExpression(/*isUnaryExpression=*/false, 226 /*isAddressOfOperand=*/false, 227 isTypeCast); 228 return ParseRHSOfBinaryExpression(move(LHS), prec::Assignment); 229} 230 231/// ParseAssignmentExprWithObjCMessageExprStart - Parse an assignment expression 232/// where part of an objc message send has already been parsed. In this case 233/// LBracLoc indicates the location of the '[' of the message send, and either 234/// ReceiverName or ReceiverExpr is non-null indicating the receiver of the 235/// message. 236/// 237/// Since this handles full assignment-expression's, it handles postfix 238/// expressions and other binary operators for these expressions as well. 239ExprResult 240Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc, 241 SourceLocation SuperLoc, 242 ParsedType ReceiverType, 243 Expr *ReceiverExpr) { 244 ExprResult R 245 = ParseObjCMessageExpressionBody(LBracLoc, SuperLoc, 246 ReceiverType, ReceiverExpr); 247 R = ParsePostfixExpressionSuffix(R); 248 return ParseRHSOfBinaryExpression(R, prec::Assignment); 249} 250 251 252ExprResult Parser::ParseConstantExpression() { 253 // C++03 [basic.def.odr]p2: 254 // An expression is potentially evaluated unless it appears where an 255 // integral constant expression is required (see 5.19) [...]. 256 // C++98 and C++11 have no such rule, but this is only a defect in C++98. 257 EnterExpressionEvaluationContext Unevaluated(Actions, 258 Sema::ConstantEvaluated); 259 260 ExprResult LHS(ParseCastExpression(false)); 261 return ParseRHSOfBinaryExpression(LHS, prec::Conditional); 262} 263 264/// ParseRHSOfBinaryExpression - Parse a binary expression that starts with 265/// LHS and has a precedence of at least MinPrec. 266ExprResult 267Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) { 268 prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(), 269 GreaterThanIsOperator, 270 getLang().CPlusPlus0x); 271 SourceLocation ColonLoc; 272 273 while (1) { 274 // If this token has a lower precedence than we are allowed to parse (e.g. 275 // because we are called recursively, or because the token is not a binop), 276 // then we are done! 277 if (NextTokPrec < MinPrec) 278 return move(LHS); 279 280 // Consume the operator, saving the operator token for error reporting. 281 Token OpToken = Tok; 282 ConsumeToken(); 283 284 // Special case handling for the ternary operator. 285 ExprResult TernaryMiddle(true); 286 if (NextTokPrec == prec::Conditional) { 287 if (Tok.isNot(tok::colon)) { 288 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 289 ColonProtectionRAIIObject X(*this); 290 291 // Handle this production specially: 292 // logical-OR-expression '?' expression ':' conditional-expression 293 // In particular, the RHS of the '?' is 'expression', not 294 // 'logical-OR-expression' as we might expect. 295 TernaryMiddle = ParseExpression(); 296 if (TernaryMiddle.isInvalid()) { 297 LHS = ExprError(); 298 TernaryMiddle = 0; 299 } 300 } else { 301 // Special case handling of "X ? Y : Z" where Y is empty: 302 // logical-OR-expression '?' ':' conditional-expression [GNU] 303 TernaryMiddle = 0; 304 Diag(Tok, diag::ext_gnu_conditional_expr); 305 } 306 307 if (Tok.is(tok::colon)) { 308 // Eat the colon. 309 ColonLoc = ConsumeToken(); 310 } else { 311 // Otherwise, we're missing a ':'. Assume that this was a typo that 312 // the user forgot. If we're not in a macro expansion, we can suggest 313 // a fixit hint. If there were two spaces before the current token, 314 // suggest inserting the colon in between them, otherwise insert ": ". 315 SourceLocation FILoc = Tok.getLocation(); 316 const char *FIText = ": "; 317 const SourceManager &SM = PP.getSourceManager(); 318 if (FILoc.isFileID() || PP.isAtStartOfMacroExpansion(FILoc, &FILoc)) { 319 assert(FILoc.isFileID()); 320 bool IsInvalid = false; 321 const char *SourcePtr = 322 SM.getCharacterData(FILoc.getLocWithOffset(-1), &IsInvalid); 323 if (!IsInvalid && *SourcePtr == ' ') { 324 SourcePtr = 325 SM.getCharacterData(FILoc.getLocWithOffset(-2), &IsInvalid); 326 if (!IsInvalid && *SourcePtr == ' ') { 327 FILoc = FILoc.getLocWithOffset(-1); 328 FIText = ":"; 329 } 330 } 331 } 332 333 Diag(Tok, diag::err_expected_colon) 334 << FixItHint::CreateInsertion(FILoc, FIText); 335 Diag(OpToken, diag::note_matching) << "?"; 336 ColonLoc = Tok.getLocation(); 337 } 338 } 339 340 // Code completion for the right-hand side of an assignment expression 341 // goes through a special hook that takes the left-hand side into account. 342 if (Tok.is(tok::code_completion) && NextTokPrec == prec::Assignment) { 343 Actions.CodeCompleteAssignmentRHS(getCurScope(), LHS.get()); 344 cutOffParsing(); 345 return ExprError(); 346 } 347 348 // Parse another leaf here for the RHS of the operator. 349 // ParseCastExpression works here because all RHS expressions in C have it 350 // as a prefix, at least. However, in C++, an assignment-expression could 351 // be a throw-expression, which is not a valid cast-expression. 352 // Therefore we need some special-casing here. 353 // Also note that the third operand of the conditional operator is 354 // an assignment-expression in C++. 355 ExprResult RHS; 356 if (getLang().CPlusPlus && NextTokPrec <= prec::Conditional) 357 RHS = ParseAssignmentExpression(); 358 else 359 RHS = ParseCastExpression(false); 360 361 if (RHS.isInvalid()) 362 LHS = ExprError(); 363 364 // Remember the precedence of this operator and get the precedence of the 365 // operator immediately to the right of the RHS. 366 prec::Level ThisPrec = NextTokPrec; 367 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 368 getLang().CPlusPlus0x); 369 370 // Assignment and conditional expressions are right-associative. 371 bool isRightAssoc = ThisPrec == prec::Conditional || 372 ThisPrec == prec::Assignment; 373 374 // Get the precedence of the operator to the right of the RHS. If it binds 375 // more tightly with RHS than we do, evaluate it completely first. 376 if (ThisPrec < NextTokPrec || 377 (ThisPrec == NextTokPrec && isRightAssoc)) { 378 // If this is left-associative, only parse things on the RHS that bind 379 // more tightly than the current operator. If it is left-associative, it 380 // is okay, to bind exactly as tightly. For example, compile A=B=C=D as 381 // A=(B=(C=D)), where each paren is a level of recursion here. 382 // The function takes ownership of the RHS. 383 RHS = ParseRHSOfBinaryExpression(RHS, 384 static_cast<prec::Level>(ThisPrec + !isRightAssoc)); 385 386 if (RHS.isInvalid()) 387 LHS = ExprError(); 388 389 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 390 getLang().CPlusPlus0x); 391 } 392 assert(NextTokPrec <= ThisPrec && "Recursion didn't work!"); 393 394 if (!LHS.isInvalid()) { 395 // Combine the LHS and RHS into the LHS (e.g. build AST). 396 if (TernaryMiddle.isInvalid()) { 397 // If we're using '>>' as an operator within a template 398 // argument list (in C++98), suggest the addition of 399 // parentheses so that the code remains well-formed in C++0x. 400 if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater)) 401 SuggestParentheses(OpToken.getLocation(), 402 diag::warn_cxx0x_right_shift_in_template_arg, 403 SourceRange(Actions.getExprRange(LHS.get()).getBegin(), 404 Actions.getExprRange(RHS.get()).getEnd())); 405 406 LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(), 407 OpToken.getKind(), LHS.take(), RHS.take()); 408 } else 409 LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc, 410 LHS.take(), TernaryMiddle.take(), 411 RHS.take()); 412 } 413 } 414} 415 416/// ParseCastExpression - Parse a cast-expression, or, if isUnaryExpression is 417/// true, parse a unary-expression. isAddressOfOperand exists because an 418/// id-expression that is the operand of address-of gets special treatment 419/// due to member pointers. 420/// 421ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 422 bool isAddressOfOperand, 423 TypeCastState isTypeCast) { 424 bool NotCastExpr; 425 ExprResult Res = ParseCastExpression(isUnaryExpression, 426 isAddressOfOperand, 427 NotCastExpr, 428 isTypeCast); 429 if (NotCastExpr) 430 Diag(Tok, diag::err_expected_expression); 431 return move(Res); 432} 433 434namespace { 435class CastExpressionIdValidator : public CorrectionCandidateCallback { 436 public: 437 CastExpressionIdValidator(bool AllowTypes, bool AllowNonTypes) 438 : AllowNonTypes(AllowNonTypes) { 439 WantTypeSpecifiers = AllowTypes; 440 } 441 442 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 443 NamedDecl *ND = candidate.getCorrectionDecl(); 444 if (!ND) 445 return candidate.isKeyword(); 446 447 if (isa<TypeDecl>(ND)) 448 return WantTypeSpecifiers; 449 return AllowNonTypes; 450 } 451 452 private: 453 bool AllowNonTypes; 454}; 455} 456 457/// ParseCastExpression - Parse a cast-expression, or, if isUnaryExpression is 458/// true, parse a unary-expression. isAddressOfOperand exists because an 459/// id-expression that is the operand of address-of gets special treatment 460/// due to member pointers. NotCastExpr is set to true if the token is not the 461/// start of a cast-expression, and no diagnostic is emitted in this case. 462/// 463/// cast-expression: [C99 6.5.4] 464/// unary-expression 465/// '(' type-name ')' cast-expression 466/// 467/// unary-expression: [C99 6.5.3] 468/// postfix-expression 469/// '++' unary-expression 470/// '--' unary-expression 471/// unary-operator cast-expression 472/// 'sizeof' unary-expression 473/// 'sizeof' '(' type-name ')' 474/// [C++0x] 'sizeof' '...' '(' identifier ')' 475/// [GNU] '__alignof' unary-expression 476/// [GNU] '__alignof' '(' type-name ')' 477/// [C++0x] 'alignof' '(' type-id ')' 478/// [GNU] '&&' identifier 479/// [C++] new-expression 480/// [C++] delete-expression 481/// [C++0x] 'noexcept' '(' expression ')' 482/// 483/// unary-operator: one of 484/// '&' '*' '+' '-' '~' '!' 485/// [GNU] '__extension__' '__real' '__imag' 486/// 487/// primary-expression: [C99 6.5.1] 488/// [C99] identifier 489/// [C++] id-expression 490/// constant 491/// string-literal 492/// [C++] boolean-literal [C++ 2.13.5] 493/// [C++0x] 'nullptr' [C++0x 2.14.7] 494/// '(' expression ')' 495/// [C11] generic-selection 496/// '__func__' [C99 6.4.2.2] 497/// [GNU] '__FUNCTION__' 498/// [GNU] '__PRETTY_FUNCTION__' 499/// [GNU] '(' compound-statement ')' 500/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 501/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 502/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 503/// assign-expr ')' 504/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 505/// [GNU] '__null' 506/// [OBJC] '[' objc-message-expr ']' 507/// [OBJC] '@selector' '(' objc-selector-arg ')' 508/// [OBJC] '@protocol' '(' identifier ')' 509/// [OBJC] '@encode' '(' type-name ')' 510/// [OBJC] objc-string-literal 511/// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 512/// [C++0x] simple-type-specifier braced-init-list [C++ 5.2.3] 513/// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 514/// [C++0x] typename-specifier braced-init-list [C++ 5.2.3] 515/// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 516/// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 517/// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 518/// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 519/// [C++] 'typeid' '(' expression ')' [C++ 5.2p1] 520/// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1] 521/// [C++] 'this' [C++ 9.3.2] 522/// [G++] unary-type-trait '(' type-id ')' 523/// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO] 524/// [EMBT] array-type-trait '(' type-id ',' integer ')' 525/// [clang] '^' block-literal 526/// 527/// constant: [C99 6.4.4] 528/// integer-constant 529/// floating-constant 530/// enumeration-constant -> identifier 531/// character-constant 532/// 533/// id-expression: [C++ 5.1] 534/// unqualified-id 535/// qualified-id 536/// 537/// unqualified-id: [C++ 5.1] 538/// identifier 539/// operator-function-id 540/// conversion-function-id 541/// '~' class-name 542/// template-id 543/// 544/// new-expression: [C++ 5.3.4] 545/// '::'[opt] 'new' new-placement[opt] new-type-id 546/// new-initializer[opt] 547/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 548/// new-initializer[opt] 549/// 550/// delete-expression: [C++ 5.3.5] 551/// '::'[opt] 'delete' cast-expression 552/// '::'[opt] 'delete' '[' ']' cast-expression 553/// 554/// [GNU/Embarcadero] unary-type-trait: 555/// '__is_arithmetic' 556/// '__is_floating_point' 557/// '__is_integral' 558/// '__is_lvalue_expr' 559/// '__is_rvalue_expr' 560/// '__is_complete_type' 561/// '__is_void' 562/// '__is_array' 563/// '__is_function' 564/// '__is_reference' 565/// '__is_lvalue_reference' 566/// '__is_rvalue_reference' 567/// '__is_fundamental' 568/// '__is_object' 569/// '__is_scalar' 570/// '__is_compound' 571/// '__is_pointer' 572/// '__is_member_object_pointer' 573/// '__is_member_function_pointer' 574/// '__is_member_pointer' 575/// '__is_const' 576/// '__is_volatile' 577/// '__is_trivial' 578/// '__is_standard_layout' 579/// '__is_signed' 580/// '__is_unsigned' 581/// 582/// [GNU] unary-type-trait: 583/// '__has_nothrow_assign' 584/// '__has_nothrow_copy' 585/// '__has_nothrow_constructor' 586/// '__has_trivial_assign' [TODO] 587/// '__has_trivial_copy' [TODO] 588/// '__has_trivial_constructor' 589/// '__has_trivial_destructor' 590/// '__has_virtual_destructor' 591/// '__is_abstract' [TODO] 592/// '__is_class' 593/// '__is_empty' [TODO] 594/// '__is_enum' 595/// '__is_final' 596/// '__is_pod' 597/// '__is_polymorphic' 598/// '__is_trivial' 599/// '__is_union' 600/// 601/// [Clang] unary-type-trait: 602/// '__trivially_copyable' 603/// 604/// binary-type-trait: 605/// [GNU] '__is_base_of' 606/// [MS] '__is_convertible_to' 607/// '__is_convertible' 608/// '__is_same' 609/// 610/// [Embarcadero] array-type-trait: 611/// '__array_rank' 612/// '__array_extent' 613/// 614/// [Embarcadero] expression-trait: 615/// '__is_lvalue_expr' 616/// '__is_rvalue_expr' 617/// 618ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 619 bool isAddressOfOperand, 620 bool &NotCastExpr, 621 TypeCastState isTypeCast) { 622 ExprResult Res; 623 tok::TokenKind SavedKind = Tok.getKind(); 624 NotCastExpr = false; 625 626 // This handles all of cast-expression, unary-expression, postfix-expression, 627 // and primary-expression. We handle them together like this for efficiency 628 // and to simplify handling of an expression starting with a '(' token: which 629 // may be one of a parenthesized expression, cast-expression, compound literal 630 // expression, or statement expression. 631 // 632 // If the parsed tokens consist of a primary-expression, the cases below 633 // break out of the switch; at the end we call ParsePostfixExpressionSuffix 634 // to handle the postfix expression suffixes. Cases that cannot be followed 635 // by postfix exprs should return without invoking 636 // ParsePostfixExpressionSuffix. 637 switch (SavedKind) { 638 case tok::l_paren: { 639 // If this expression is limited to being a unary-expression, the parent can 640 // not start a cast expression. 641 ParenParseOption ParenExprType = 642 (isUnaryExpression && !getLang().CPlusPlus)? CompoundLiteral : CastExpr; 643 ParsedType CastTy; 644 SourceLocation RParenLoc; 645 646 { 647 // The inside of the parens don't need to be a colon protected scope, and 648 // isn't immediately a message send. 649 ColonProtectionRAIIObject X(*this, false); 650 651 Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/, 652 isTypeCast == IsTypeCast, CastTy, RParenLoc); 653 } 654 655 switch (ParenExprType) { 656 case SimpleExpr: break; // Nothing else to do. 657 case CompoundStmt: break; // Nothing else to do. 658 case CompoundLiteral: 659 // We parsed '(' type-name ')' '{' ... '}'. If any suffixes of 660 // postfix-expression exist, parse them now. 661 break; 662 case CastExpr: 663 // We have parsed the cast-expression and no postfix-expr pieces are 664 // following. 665 return move(Res); 666 } 667 668 break; 669 } 670 671 // primary-expression 672 case tok::numeric_constant: 673 // constant: integer-constant 674 // constant: floating-constant 675 676 Res = Actions.ActOnNumericConstant(Tok); 677 ConsumeToken(); 678 break; 679 680 case tok::kw_true: 681 case tok::kw_false: 682 return ParseCXXBoolLiteral(); 683 684 case tok::kw_nullptr: 685 Diag(Tok, diag::warn_cxx98_compat_nullptr); 686 return Actions.ActOnCXXNullPtrLiteral(ConsumeToken()); 687 688 case tok::annot_primary_expr: 689 assert(Res.get() == 0 && "Stray primary-expression annotation?"); 690 Res = getExprAnnotation(Tok); 691 ConsumeToken(); 692 break; 693 694 case tok::kw_decltype: 695 case tok::identifier: { // primary-expression: identifier 696 // unqualified-id: identifier 697 // constant: enumeration-constant 698 // Turn a potentially qualified name into a annot_typename or 699 // annot_cxxscope if it would be valid. This handles things like x::y, etc. 700 if (getLang().CPlusPlus) { 701 // Avoid the unnecessary parse-time lookup in the common case 702 // where the syntax forbids a type. 703 const Token &Next = NextToken(); 704 if (Next.is(tok::coloncolon) || 705 (!ColonIsSacred && Next.is(tok::colon)) || 706 Next.is(tok::less) || 707 Next.is(tok::l_paren) || 708 Next.is(tok::l_brace)) { 709 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 710 if (TryAnnotateTypeOrScopeToken()) 711 return ExprError(); 712 if (!Tok.is(tok::identifier)) 713 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 714 } 715 } 716 717 // Consume the identifier so that we can see if it is followed by a '(' or 718 // '.'. 719 IdentifierInfo &II = *Tok.getIdentifierInfo(); 720 SourceLocation ILoc = ConsumeToken(); 721 722 // Support 'Class.property' and 'super.property' notation. 723 if (getLang().ObjC1 && Tok.is(tok::period) && 724 (Actions.getTypeName(II, ILoc, getCurScope()) || 725 // Allow the base to be 'super' if in an objc-method. 726 (&II == Ident_super && getCurScope()->isInObjcMethodScope()))) { 727 ConsumeToken(); 728 729 if (Tok.isNot(tok::identifier)) { 730 Diag(Tok, diag::err_expected_property_name); 731 return ExprError(); 732 } 733 IdentifierInfo &PropertyName = *Tok.getIdentifierInfo(); 734 SourceLocation PropertyLoc = ConsumeToken(); 735 736 Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName, 737 ILoc, PropertyLoc); 738 break; 739 } 740 741 // In an Objective-C method, if we have "super" followed by an identifier, 742 // the token sequence is ill-formed. However, if there's a ':' or ']' after 743 // that identifier, this is probably a message send with a missing open 744 // bracket. Treat it as such. 745 if (getLang().ObjC1 && &II == Ident_super && !InMessageExpression && 746 getCurScope()->isInObjcMethodScope() && 747 ((Tok.is(tok::identifier) && 748 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) || 749 Tok.is(tok::code_completion))) { 750 Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, ParsedType(), 751 0); 752 break; 753 } 754 755 // If we have an Objective-C class name followed by an identifier 756 // and either ':' or ']', this is an Objective-C class message 757 // send that's missing the opening '['. Recovery 758 // appropriately. Also take this path if we're performing code 759 // completion after an Objective-C class name. 760 if (getLang().ObjC1 && 761 ((Tok.is(tok::identifier) && !InMessageExpression) || 762 Tok.is(tok::code_completion))) { 763 const Token& Next = NextToken(); 764 if (Tok.is(tok::code_completion) || 765 Next.is(tok::colon) || Next.is(tok::r_square)) 766 if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope())) 767 if (Typ.get()->isObjCObjectOrInterfaceType()) { 768 // Fake up a Declarator to use with ActOnTypeName. 769 DeclSpec DS(AttrFactory); 770 DS.SetRangeStart(ILoc); 771 DS.SetRangeEnd(ILoc); 772 const char *PrevSpec = 0; 773 unsigned DiagID; 774 DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ); 775 776 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 777 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), 778 DeclaratorInfo); 779 if (Ty.isInvalid()) 780 break; 781 782 Res = ParseObjCMessageExpressionBody(SourceLocation(), 783 SourceLocation(), 784 Ty.get(), 0); 785 break; 786 } 787 } 788 789 // Make sure to pass down the right value for isAddressOfOperand. 790 if (isAddressOfOperand && isPostfixExpressionSuffixStart()) 791 isAddressOfOperand = false; 792 793 // Function designators are allowed to be undeclared (C99 6.5.1p2), so we 794 // need to know whether or not this identifier is a function designator or 795 // not. 796 UnqualifiedId Name; 797 CXXScopeSpec ScopeSpec; 798 SourceLocation TemplateKWLoc; 799 CastExpressionIdValidator Validator(isTypeCast != NotTypeCast, 800 isTypeCast != IsTypeCast); 801 Name.setIdentifier(&II, ILoc); 802 Res = Actions.ActOnIdExpression(getCurScope(), ScopeSpec, TemplateKWLoc, 803 Name, Tok.is(tok::l_paren), 804 isAddressOfOperand, &Validator); 805 break; 806 } 807 case tok::char_constant: // constant: character-constant 808 case tok::wide_char_constant: 809 case tok::utf16_char_constant: 810 case tok::utf32_char_constant: 811 Res = Actions.ActOnCharacterConstant(Tok); 812 ConsumeToken(); 813 break; 814 case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2] 815 case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU] 816 case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU] 817 Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind); 818 ConsumeToken(); 819 break; 820 case tok::string_literal: // primary-expression: string-literal 821 case tok::wide_string_literal: 822 case tok::utf8_string_literal: 823 case tok::utf16_string_literal: 824 case tok::utf32_string_literal: 825 Res = ParseStringLiteralExpression(); 826 break; 827 case tok::kw__Generic: // primary-expression: generic-selection [C11 6.5.1] 828 Res = ParseGenericSelectionExpression(); 829 break; 830 case tok::kw___builtin_va_arg: 831 case tok::kw___builtin_offsetof: 832 case tok::kw___builtin_choose_expr: 833 case tok::kw___builtin_astype: // primary-expression: [OCL] as_type() 834 return ParseBuiltinPrimaryExpression(); 835 case tok::kw___null: 836 return Actions.ActOnGNUNullExpr(ConsumeToken()); 837 838 case tok::plusplus: // unary-expression: '++' unary-expression [C99] 839 case tok::minusminus: { // unary-expression: '--' unary-expression [C99] 840 // C++ [expr.unary] has: 841 // unary-expression: 842 // ++ cast-expression 843 // -- cast-expression 844 SourceLocation SavedLoc = ConsumeToken(); 845 Res = ParseCastExpression(!getLang().CPlusPlus); 846 if (!Res.isInvalid()) 847 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 848 return move(Res); 849 } 850 case tok::amp: { // unary-expression: '&' cast-expression 851 // Special treatment because of member pointers 852 SourceLocation SavedLoc = ConsumeToken(); 853 Res = ParseCastExpression(false, true); 854 if (!Res.isInvalid()) 855 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 856 return move(Res); 857 } 858 859 case tok::star: // unary-expression: '*' cast-expression 860 case tok::plus: // unary-expression: '+' cast-expression 861 case tok::minus: // unary-expression: '-' cast-expression 862 case tok::tilde: // unary-expression: '~' cast-expression 863 case tok::exclaim: // unary-expression: '!' cast-expression 864 case tok::kw___real: // unary-expression: '__real' cast-expression [GNU] 865 case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU] 866 SourceLocation SavedLoc = ConsumeToken(); 867 Res = ParseCastExpression(false); 868 if (!Res.isInvalid()) 869 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 870 return move(Res); 871 } 872 873 case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU] 874 // __extension__ silences extension warnings in the subexpression. 875 ExtensionRAIIObject O(Diags); // Use RAII to do this. 876 SourceLocation SavedLoc = ConsumeToken(); 877 Res = ParseCastExpression(false); 878 if (!Res.isInvalid()) 879 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 880 return move(Res); 881 } 882 case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression 883 // unary-expression: 'sizeof' '(' type-name ')' 884 case tok::kw_alignof: 885 case tok::kw___alignof: // unary-expression: '__alignof' unary-expression 886 // unary-expression: '__alignof' '(' type-name ')' 887 // unary-expression: 'alignof' '(' type-id ')' 888 case tok::kw_vec_step: // unary-expression: OpenCL 'vec_step' expression 889 return ParseUnaryExprOrTypeTraitExpression(); 890 case tok::ampamp: { // unary-expression: '&&' identifier 891 SourceLocation AmpAmpLoc = ConsumeToken(); 892 if (Tok.isNot(tok::identifier)) 893 return ExprError(Diag(Tok, diag::err_expected_ident)); 894 895 if (getCurScope()->getFnParent() == 0) 896 return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn)); 897 898 Diag(AmpAmpLoc, diag::ext_gnu_address_of_label); 899 LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(), 900 Tok.getLocation()); 901 Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD); 902 ConsumeToken(); 903 return move(Res); 904 } 905 case tok::kw_const_cast: 906 case tok::kw_dynamic_cast: 907 case tok::kw_reinterpret_cast: 908 case tok::kw_static_cast: 909 Res = ParseCXXCasts(); 910 break; 911 case tok::kw_typeid: 912 Res = ParseCXXTypeid(); 913 break; 914 case tok::kw___uuidof: 915 Res = ParseCXXUuidof(); 916 break; 917 case tok::kw_this: 918 Res = ParseCXXThis(); 919 break; 920 921 case tok::annot_typename: 922 if (isStartOfObjCClassMessageMissingOpenBracket()) { 923 ParsedType Type = getTypeAnnotation(Tok); 924 925 // Fake up a Declarator to use with ActOnTypeName. 926 DeclSpec DS(AttrFactory); 927 DS.SetRangeStart(Tok.getLocation()); 928 DS.SetRangeEnd(Tok.getLastLoc()); 929 930 const char *PrevSpec = 0; 931 unsigned DiagID; 932 DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(), 933 PrevSpec, DiagID, Type); 934 935 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 936 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 937 if (Ty.isInvalid()) 938 break; 939 940 ConsumeToken(); 941 Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 942 Ty.get(), 0); 943 break; 944 } 945 // Fall through 946 947 case tok::annot_decltype: 948 case tok::kw_char: 949 case tok::kw_wchar_t: 950 case tok::kw_char16_t: 951 case tok::kw_char32_t: 952 case tok::kw_bool: 953 case tok::kw_short: 954 case tok::kw_int: 955 case tok::kw_long: 956 case tok::kw___int64: 957 case tok::kw_signed: 958 case tok::kw_unsigned: 959 case tok::kw_half: 960 case tok::kw_float: 961 case tok::kw_double: 962 case tok::kw_void: 963 case tok::kw_typename: 964 case tok::kw_typeof: 965 case tok::kw___vector: { 966 if (!getLang().CPlusPlus) { 967 Diag(Tok, diag::err_expected_expression); 968 return ExprError(); 969 } 970 971 if (SavedKind == tok::kw_typename) { 972 // postfix-expression: typename-specifier '(' expression-list[opt] ')' 973 // typename-specifier braced-init-list 974 if (TryAnnotateTypeOrScopeToken()) 975 return ExprError(); 976 } 977 978 // postfix-expression: simple-type-specifier '(' expression-list[opt] ')' 979 // simple-type-specifier braced-init-list 980 // 981 DeclSpec DS(AttrFactory); 982 ParseCXXSimpleTypeSpecifier(DS); 983 if (Tok.isNot(tok::l_paren) && 984 (!getLang().CPlusPlus0x || Tok.isNot(tok::l_brace))) 985 return ExprError(Diag(Tok, diag::err_expected_lparen_after_type) 986 << DS.getSourceRange()); 987 988 if (Tok.is(tok::l_brace)) 989 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 990 991 Res = ParseCXXTypeConstructExpression(DS); 992 break; 993 } 994 995 case tok::annot_cxxscope: { // [C++] id-expression: qualified-id 996 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 997 // (We can end up in this situation after tentative parsing.) 998 if (TryAnnotateTypeOrScopeToken()) 999 return ExprError(); 1000 if (!Tok.is(tok::annot_cxxscope)) 1001 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1002 NotCastExpr, isTypeCast); 1003 1004 Token Next = NextToken(); 1005 if (Next.is(tok::annot_template_id)) { 1006 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next); 1007 if (TemplateId->Kind == TNK_Type_template) { 1008 // We have a qualified template-id that we know refers to a 1009 // type, translate it into a type and continue parsing as a 1010 // cast expression. 1011 CXXScopeSpec SS; 1012 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), 1013 /*EnteringContext=*/false); 1014 AnnotateTemplateIdTokenAsType(); 1015 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1016 NotCastExpr, isTypeCast); 1017 } 1018 } 1019 1020 // Parse as an id-expression. 1021 Res = ParseCXXIdExpression(isAddressOfOperand); 1022 break; 1023 } 1024 1025 case tok::annot_template_id: { // [C++] template-id 1026 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok); 1027 if (TemplateId->Kind == TNK_Type_template) { 1028 // We have a template-id that we know refers to a type, 1029 // translate it into a type and continue parsing as a cast 1030 // expression. 1031 AnnotateTemplateIdTokenAsType(); 1032 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1033 NotCastExpr, isTypeCast); 1034 } 1035 1036 // Fall through to treat the template-id as an id-expression. 1037 } 1038 1039 case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id 1040 Res = ParseCXXIdExpression(isAddressOfOperand); 1041 break; 1042 1043 case tok::coloncolon: { 1044 // ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken 1045 // annotates the token, tail recurse. 1046 if (TryAnnotateTypeOrScopeToken()) 1047 return ExprError(); 1048 if (!Tok.is(tok::coloncolon)) 1049 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 1050 1051 // ::new -> [C++] new-expression 1052 // ::delete -> [C++] delete-expression 1053 SourceLocation CCLoc = ConsumeToken(); 1054 if (Tok.is(tok::kw_new)) 1055 return ParseCXXNewExpression(true, CCLoc); 1056 if (Tok.is(tok::kw_delete)) 1057 return ParseCXXDeleteExpression(true, CCLoc); 1058 1059 // This is not a type name or scope specifier, it is an invalid expression. 1060 Diag(CCLoc, diag::err_expected_expression); 1061 return ExprError(); 1062 } 1063 1064 case tok::kw_new: // [C++] new-expression 1065 return ParseCXXNewExpression(false, Tok.getLocation()); 1066 1067 case tok::kw_delete: // [C++] delete-expression 1068 return ParseCXXDeleteExpression(false, Tok.getLocation()); 1069 1070 case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')' 1071 Diag(Tok, diag::warn_cxx98_compat_noexcept_expr); 1072 SourceLocation KeyLoc = ConsumeToken(); 1073 BalancedDelimiterTracker T(*this, tok::l_paren); 1074 1075 if (T.expectAndConsume(diag::err_expected_lparen_after, "noexcept")) 1076 return ExprError(); 1077 // C++11 [expr.unary.noexcept]p1: 1078 // The noexcept operator determines whether the evaluation of its operand, 1079 // which is an unevaluated operand, can throw an exception. 1080 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 1081 ExprResult Result = ParseExpression(); 1082 1083 T.consumeClose(); 1084 1085 if (!Result.isInvalid()) 1086 Result = Actions.ActOnNoexceptExpr(KeyLoc, T.getOpenLocation(), 1087 Result.take(), T.getCloseLocation()); 1088 return move(Result); 1089 } 1090 1091 case tok::kw___is_abstract: // [GNU] unary-type-trait 1092 case tok::kw___is_class: 1093 case tok::kw___is_empty: 1094 case tok::kw___is_enum: 1095 case tok::kw___is_literal: 1096 case tok::kw___is_arithmetic: 1097 case tok::kw___is_integral: 1098 case tok::kw___is_floating_point: 1099 case tok::kw___is_complete_type: 1100 case tok::kw___is_void: 1101 case tok::kw___is_array: 1102 case tok::kw___is_function: 1103 case tok::kw___is_reference: 1104 case tok::kw___is_lvalue_reference: 1105 case tok::kw___is_rvalue_reference: 1106 case tok::kw___is_fundamental: 1107 case tok::kw___is_object: 1108 case tok::kw___is_scalar: 1109 case tok::kw___is_compound: 1110 case tok::kw___is_pointer: 1111 case tok::kw___is_member_object_pointer: 1112 case tok::kw___is_member_function_pointer: 1113 case tok::kw___is_member_pointer: 1114 case tok::kw___is_const: 1115 case tok::kw___is_volatile: 1116 case tok::kw___is_standard_layout: 1117 case tok::kw___is_signed: 1118 case tok::kw___is_unsigned: 1119 case tok::kw___is_literal_type: 1120 case tok::kw___is_pod: 1121 case tok::kw___is_polymorphic: 1122 case tok::kw___is_trivial: 1123 case tok::kw___is_trivially_copyable: 1124 case tok::kw___is_union: 1125 case tok::kw___is_final: 1126 case tok::kw___has_trivial_constructor: 1127 case tok::kw___has_trivial_copy: 1128 case tok::kw___has_trivial_assign: 1129 case tok::kw___has_trivial_destructor: 1130 case tok::kw___has_nothrow_assign: 1131 case tok::kw___has_nothrow_copy: 1132 case tok::kw___has_nothrow_constructor: 1133 case tok::kw___has_virtual_destructor: 1134 return ParseUnaryTypeTrait(); 1135 1136 case tok::kw___builtin_types_compatible_p: 1137 case tok::kw___is_base_of: 1138 case tok::kw___is_same: 1139 case tok::kw___is_convertible: 1140 case tok::kw___is_convertible_to: 1141 return ParseBinaryTypeTrait(); 1142 1143 case tok::kw___array_rank: 1144 case tok::kw___array_extent: 1145 return ParseArrayTypeTrait(); 1146 1147 case tok::kw___is_lvalue_expr: 1148 case tok::kw___is_rvalue_expr: 1149 return ParseExpressionTrait(); 1150 1151 case tok::at: { 1152 SourceLocation AtLoc = ConsumeToken(); 1153 return ParseObjCAtExpression(AtLoc); 1154 } 1155 case tok::caret: 1156 Res = ParseBlockLiteralExpression(); 1157 break; 1158 case tok::code_completion: { 1159 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 1160 cutOffParsing(); 1161 return ExprError(); 1162 } 1163 case tok::l_square: 1164 if (getLang().CPlusPlus0x) { 1165 if (getLang().ObjC1) { 1166 // C++11 lambda expressions and Objective-C message sends both start with a 1167 // square bracket. There are three possibilities here: 1168 // we have a valid lambda expression, we have an invalid lambda 1169 // expression, or we have something that doesn't appear to be a lambda. 1170 // If we're in the last case, we fall back to ParseObjCMessageExpression. 1171 Res = TryParseLambdaExpression(); 1172 if (!Res.isInvalid() && !Res.get()) 1173 Res = ParseObjCMessageExpression(); 1174 break; 1175 } 1176 Res = ParseLambdaExpression(); 1177 break; 1178 } 1179 if (getLang().ObjC1) { 1180 Res = ParseObjCMessageExpression(); 1181 break; 1182 } 1183 // FALL THROUGH. 1184 default: 1185 NotCastExpr = true; 1186 return ExprError(); 1187 } 1188 1189 // These can be followed by postfix-expr pieces. 1190 return ParsePostfixExpressionSuffix(Res); 1191} 1192 1193/// ParsePostfixExpressionSuffix - Once the leading part of a postfix-expression 1194/// is parsed, this method parses any suffixes that apply. 1195/// 1196/// postfix-expression: [C99 6.5.2] 1197/// primary-expression 1198/// postfix-expression '[' expression ']' 1199/// postfix-expression '[' braced-init-list ']' 1200/// postfix-expression '(' argument-expression-list[opt] ')' 1201/// postfix-expression '.' identifier 1202/// postfix-expression '->' identifier 1203/// postfix-expression '++' 1204/// postfix-expression '--' 1205/// '(' type-name ')' '{' initializer-list '}' 1206/// '(' type-name ')' '{' initializer-list ',' '}' 1207/// 1208/// argument-expression-list: [C99 6.5.2] 1209/// argument-expression ...[opt] 1210/// argument-expression-list ',' assignment-expression ...[opt] 1211/// 1212ExprResult 1213Parser::ParsePostfixExpressionSuffix(ExprResult LHS) { 1214 // Now that the primary-expression piece of the postfix-expression has been 1215 // parsed, see if there are any postfix-expression pieces here. 1216 SourceLocation Loc; 1217 while (1) { 1218 switch (Tok.getKind()) { 1219 case tok::code_completion: 1220 if (InMessageExpression) 1221 return move(LHS); 1222 1223 Actions.CodeCompletePostfixExpression(getCurScope(), LHS); 1224 cutOffParsing(); 1225 return ExprError(); 1226 1227 case tok::identifier: 1228 // If we see identifier: after an expression, and we're not already in a 1229 // message send, then this is probably a message send with a missing 1230 // opening bracket '['. 1231 if (getLang().ObjC1 && !InMessageExpression && 1232 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) { 1233 LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 1234 ParsedType(), LHS.get()); 1235 break; 1236 } 1237 1238 // Fall through; this isn't a message send. 1239 1240 default: // Not a postfix-expression suffix. 1241 return move(LHS); 1242 case tok::l_square: { // postfix-expression: p-e '[' expression ']' 1243 // If we have a array postfix expression that starts on a new line and 1244 // Objective-C is enabled, it is highly likely that the user forgot a 1245 // semicolon after the base expression and that the array postfix-expr is 1246 // actually another message send. In this case, do some look-ahead to see 1247 // if the contents of the square brackets are obviously not a valid 1248 // expression and recover by pretending there is no suffix. 1249 if (getLang().ObjC1 && Tok.isAtStartOfLine() && 1250 isSimpleObjCMessageExpression()) 1251 return move(LHS); 1252 1253 BalancedDelimiterTracker T(*this, tok::l_square); 1254 T.consumeOpen(); 1255 Loc = T.getOpenLocation(); 1256 ExprResult Idx; 1257 if (getLang().CPlusPlus0x && Tok.is(tok::l_brace)) { 1258 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 1259 Idx = ParseBraceInitializer(); 1260 } else 1261 Idx = ParseExpression(); 1262 1263 SourceLocation RLoc = Tok.getLocation(); 1264 1265 if (!LHS.isInvalid() && !Idx.isInvalid() && Tok.is(tok::r_square)) { 1266 LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.take(), Loc, 1267 Idx.take(), RLoc); 1268 } else 1269 LHS = ExprError(); 1270 1271 // Match the ']'. 1272 T.consumeClose(); 1273 break; 1274 } 1275 1276 case tok::l_paren: // p-e: p-e '(' argument-expression-list[opt] ')' 1277 case tok::lesslessless: { // p-e: p-e '<<<' argument-expression-list '>>>' 1278 // '(' argument-expression-list[opt] ')' 1279 tok::TokenKind OpKind = Tok.getKind(); 1280 InMessageExpressionRAIIObject InMessage(*this, false); 1281 1282 Expr *ExecConfig = 0; 1283 1284 BalancedDelimiterTracker LLLT(*this, tok::lesslessless); 1285 BalancedDelimiterTracker PT(*this, tok::l_paren); 1286 1287 if (OpKind == tok::lesslessless) { 1288 ExprVector ExecConfigExprs(Actions); 1289 CommaLocsTy ExecConfigCommaLocs; 1290 LLLT.consumeOpen(); 1291 1292 if (ParseExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) { 1293 LHS = ExprError(); 1294 } 1295 1296 if (LHS.isInvalid()) { 1297 SkipUntil(tok::greatergreatergreater); 1298 } else if (LLLT.consumeClose()) { 1299 // There was an error closing the brackets 1300 LHS = ExprError(); 1301 } 1302 1303 if (!LHS.isInvalid()) { 1304 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen, "")) 1305 LHS = ExprError(); 1306 else 1307 Loc = PrevTokLocation; 1308 } 1309 1310 if (!LHS.isInvalid()) { 1311 ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(), 1312 LLLT.getOpenLocation(), 1313 move_arg(ExecConfigExprs), 1314 LLLT.getCloseLocation()); 1315 if (ECResult.isInvalid()) 1316 LHS = ExprError(); 1317 else 1318 ExecConfig = ECResult.get(); 1319 } 1320 } else { 1321 PT.consumeOpen(); 1322 Loc = PT.getOpenLocation(); 1323 } 1324 1325 ExprVector ArgExprs(Actions); 1326 CommaLocsTy CommaLocs; 1327 1328 if (Tok.is(tok::code_completion)) { 1329 Actions.CodeCompleteCall(getCurScope(), LHS.get(), 0, 0); 1330 cutOffParsing(); 1331 return ExprError(); 1332 } 1333 1334 if (OpKind == tok::l_paren || !LHS.isInvalid()) { 1335 if (Tok.isNot(tok::r_paren)) { 1336 if (ParseExpressionList(ArgExprs, CommaLocs, &Sema::CodeCompleteCall, 1337 LHS.get())) { 1338 LHS = ExprError(); 1339 } 1340 } 1341 } 1342 1343 // Match the ')'. 1344 if (LHS.isInvalid()) { 1345 SkipUntil(tok::r_paren); 1346 } else if (Tok.isNot(tok::r_paren)) { 1347 PT.consumeClose(); 1348 LHS = ExprError(); 1349 } else { 1350 assert((ArgExprs.size() == 0 || 1351 ArgExprs.size()-1 == CommaLocs.size())&& 1352 "Unexpected number of commas!"); 1353 LHS = Actions.ActOnCallExpr(getCurScope(), LHS.take(), Loc, 1354 move_arg(ArgExprs), Tok.getLocation(), 1355 ExecConfig); 1356 PT.consumeClose(); 1357 } 1358 1359 break; 1360 } 1361 case tok::arrow: 1362 case tok::period: { 1363 // postfix-expression: p-e '->' template[opt] id-expression 1364 // postfix-expression: p-e '.' template[opt] id-expression 1365 tok::TokenKind OpKind = Tok.getKind(); 1366 SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token. 1367 1368 CXXScopeSpec SS; 1369 ParsedType ObjectType; 1370 bool MayBePseudoDestructor = false; 1371 if (getLang().CPlusPlus && !LHS.isInvalid()) { 1372 LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), LHS.take(), 1373 OpLoc, OpKind, ObjectType, 1374 MayBePseudoDestructor); 1375 if (LHS.isInvalid()) 1376 break; 1377 1378 ParseOptionalCXXScopeSpecifier(SS, ObjectType, 1379 /*EnteringContext=*/false, 1380 &MayBePseudoDestructor); 1381 if (SS.isNotEmpty()) 1382 ObjectType = ParsedType(); 1383 } 1384 1385 if (Tok.is(tok::code_completion)) { 1386 // Code completion for a member access expression. 1387 Actions.CodeCompleteMemberReferenceExpr(getCurScope(), LHS.get(), 1388 OpLoc, OpKind == tok::arrow); 1389 1390 cutOffParsing(); 1391 return ExprError(); 1392 } 1393 1394 if (MayBePseudoDestructor && !LHS.isInvalid()) { 1395 LHS = ParseCXXPseudoDestructor(LHS.take(), OpLoc, OpKind, SS, 1396 ObjectType); 1397 break; 1398 } 1399 1400 // Either the action has told is that this cannot be a 1401 // pseudo-destructor expression (based on the type of base 1402 // expression), or we didn't see a '~' in the right place. We 1403 // can still parse a destructor name here, but in that case it 1404 // names a real destructor. 1405 // Allow explicit constructor calls in Microsoft mode. 1406 // FIXME: Add support for explicit call of template constructor. 1407 SourceLocation TemplateKWLoc; 1408 UnqualifiedId Name; 1409 if (ParseUnqualifiedId(SS, 1410 /*EnteringContext=*/false, 1411 /*AllowDestructorName=*/true, 1412 /*AllowConstructorName=*/ getLang().MicrosoftExt, 1413 ObjectType, TemplateKWLoc, Name)) 1414 LHS = ExprError(); 1415 1416 if (!LHS.isInvalid()) 1417 LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.take(), OpLoc, 1418 OpKind, SS, TemplateKWLoc, Name, 1419 CurParsedObjCImpl ? CurParsedObjCImpl->Dcl : 0, 1420 Tok.is(tok::l_paren)); 1421 break; 1422 } 1423 case tok::plusplus: // postfix-expression: postfix-expression '++' 1424 case tok::minusminus: // postfix-expression: postfix-expression '--' 1425 if (!LHS.isInvalid()) { 1426 LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(), 1427 Tok.getKind(), LHS.take()); 1428 } 1429 ConsumeToken(); 1430 break; 1431 } 1432 } 1433} 1434 1435/// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/ 1436/// vec_step and we are at the start of an expression or a parenthesized 1437/// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the 1438/// expression (isCastExpr == false) or the type (isCastExpr == true). 1439/// 1440/// unary-expression: [C99 6.5.3] 1441/// 'sizeof' unary-expression 1442/// 'sizeof' '(' type-name ')' 1443/// [GNU] '__alignof' unary-expression 1444/// [GNU] '__alignof' '(' type-name ')' 1445/// [C++0x] 'alignof' '(' type-id ')' 1446/// 1447/// [GNU] typeof-specifier: 1448/// typeof ( expressions ) 1449/// typeof ( type-name ) 1450/// [GNU/C++] typeof unary-expression 1451/// 1452/// [OpenCL 1.1 6.11.12] vec_step built-in function: 1453/// vec_step ( expressions ) 1454/// vec_step ( type-name ) 1455/// 1456ExprResult 1457Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok, 1458 bool &isCastExpr, 1459 ParsedType &CastTy, 1460 SourceRange &CastRange) { 1461 1462 assert((OpTok.is(tok::kw_typeof) || OpTok.is(tok::kw_sizeof) || 1463 OpTok.is(tok::kw___alignof) || OpTok.is(tok::kw_alignof) || 1464 OpTok.is(tok::kw_vec_step)) && 1465 "Not a typeof/sizeof/alignof/vec_step expression!"); 1466 1467 ExprResult Operand; 1468 1469 // If the operand doesn't start with an '(', it must be an expression. 1470 if (Tok.isNot(tok::l_paren)) { 1471 isCastExpr = false; 1472 if (OpTok.is(tok::kw_typeof) && !getLang().CPlusPlus) { 1473 Diag(Tok,diag::err_expected_lparen_after_id) << OpTok.getIdentifierInfo(); 1474 return ExprError(); 1475 } 1476 1477 Operand = ParseCastExpression(true/*isUnaryExpression*/); 1478 } else { 1479 // If it starts with a '(', we know that it is either a parenthesized 1480 // type-name, or it is a unary-expression that starts with a compound 1481 // literal, or starts with a primary-expression that is a parenthesized 1482 // expression. 1483 ParenParseOption ExprType = CastExpr; 1484 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc; 1485 1486 Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/, 1487 false, CastTy, RParenLoc); 1488 CastRange = SourceRange(LParenLoc, RParenLoc); 1489 1490 // If ParseParenExpression parsed a '(typename)' sequence only, then this is 1491 // a type. 1492 if (ExprType == CastExpr) { 1493 isCastExpr = true; 1494 return ExprEmpty(); 1495 } 1496 1497 if (getLang().CPlusPlus || OpTok.isNot(tok::kw_typeof)) { 1498 // GNU typeof in C requires the expression to be parenthesized. Not so for 1499 // sizeof/alignof or in C++. Therefore, the parenthesized expression is 1500 // the start of a unary-expression, but doesn't include any postfix 1501 // pieces. Parse these now if present. 1502 if (!Operand.isInvalid()) 1503 Operand = ParsePostfixExpressionSuffix(Operand.get()); 1504 } 1505 } 1506 1507 // If we get here, the operand to the typeof/sizeof/alignof was an expresion. 1508 isCastExpr = false; 1509 return move(Operand); 1510} 1511 1512 1513/// ParseUnaryExprOrTypeTraitExpression - Parse a sizeof or alignof expression. 1514/// unary-expression: [C99 6.5.3] 1515/// 'sizeof' unary-expression 1516/// 'sizeof' '(' type-name ')' 1517/// [C++0x] 'sizeof' '...' '(' identifier ')' 1518/// [GNU] '__alignof' unary-expression 1519/// [GNU] '__alignof' '(' type-name ')' 1520/// [C++0x] 'alignof' '(' type-id ')' 1521ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() { 1522 assert((Tok.is(tok::kw_sizeof) || Tok.is(tok::kw___alignof) 1523 || Tok.is(tok::kw_alignof) || Tok.is(tok::kw_vec_step)) && 1524 "Not a sizeof/alignof/vec_step expression!"); 1525 Token OpTok = Tok; 1526 ConsumeToken(); 1527 1528 // [C++0x] 'sizeof' '...' '(' identifier ')' 1529 if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) { 1530 SourceLocation EllipsisLoc = ConsumeToken(); 1531 SourceLocation LParenLoc, RParenLoc; 1532 IdentifierInfo *Name = 0; 1533 SourceLocation NameLoc; 1534 if (Tok.is(tok::l_paren)) { 1535 BalancedDelimiterTracker T(*this, tok::l_paren); 1536 T.consumeOpen(); 1537 LParenLoc = T.getOpenLocation(); 1538 if (Tok.is(tok::identifier)) { 1539 Name = Tok.getIdentifierInfo(); 1540 NameLoc = ConsumeToken(); 1541 T.consumeClose(); 1542 RParenLoc = T.getCloseLocation(); 1543 if (RParenLoc.isInvalid()) 1544 RParenLoc = PP.getLocForEndOfToken(NameLoc); 1545 } else { 1546 Diag(Tok, diag::err_expected_parameter_pack); 1547 SkipUntil(tok::r_paren); 1548 } 1549 } else if (Tok.is(tok::identifier)) { 1550 Name = Tok.getIdentifierInfo(); 1551 NameLoc = ConsumeToken(); 1552 LParenLoc = PP.getLocForEndOfToken(EllipsisLoc); 1553 RParenLoc = PP.getLocForEndOfToken(NameLoc); 1554 Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack) 1555 << Name 1556 << FixItHint::CreateInsertion(LParenLoc, "(") 1557 << FixItHint::CreateInsertion(RParenLoc, ")"); 1558 } else { 1559 Diag(Tok, diag::err_sizeof_parameter_pack); 1560 } 1561 1562 if (!Name) 1563 return ExprError(); 1564 1565 return Actions.ActOnSizeofParameterPackExpr(getCurScope(), 1566 OpTok.getLocation(), 1567 *Name, NameLoc, 1568 RParenLoc); 1569 } 1570 1571 if (OpTok.is(tok::kw_alignof)) 1572 Diag(OpTok, diag::warn_cxx98_compat_alignof); 1573 1574 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 1575 1576 bool isCastExpr; 1577 ParsedType CastTy; 1578 SourceRange CastRange; 1579 ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok, 1580 isCastExpr, 1581 CastTy, 1582 CastRange); 1583 1584 UnaryExprOrTypeTrait ExprKind = UETT_SizeOf; 1585 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw___alignof)) 1586 ExprKind = UETT_AlignOf; 1587 else if (OpTok.is(tok::kw_vec_step)) 1588 ExprKind = UETT_VecStep; 1589 1590 if (isCastExpr) 1591 return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(), 1592 ExprKind, 1593 /*isType=*/true, 1594 CastTy.getAsOpaquePtr(), 1595 CastRange); 1596 1597 // If we get here, the operand to the sizeof/alignof was an expresion. 1598 if (!Operand.isInvalid()) 1599 Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(), 1600 ExprKind, 1601 /*isType=*/false, 1602 Operand.release(), 1603 CastRange); 1604 return move(Operand); 1605} 1606 1607/// ParseBuiltinPrimaryExpression 1608/// 1609/// primary-expression: [C99 6.5.1] 1610/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 1611/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 1612/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 1613/// assign-expr ')' 1614/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 1615/// [OCL] '__builtin_astype' '(' assignment-expression ',' type-name ')' 1616/// 1617/// [GNU] offsetof-member-designator: 1618/// [GNU] identifier 1619/// [GNU] offsetof-member-designator '.' identifier 1620/// [GNU] offsetof-member-designator '[' expression ']' 1621/// 1622ExprResult Parser::ParseBuiltinPrimaryExpression() { 1623 ExprResult Res; 1624 const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo(); 1625 1626 tok::TokenKind T = Tok.getKind(); 1627 SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier. 1628 1629 // All of these start with an open paren. 1630 if (Tok.isNot(tok::l_paren)) 1631 return ExprError(Diag(Tok, diag::err_expected_lparen_after_id) 1632 << BuiltinII); 1633 1634 BalancedDelimiterTracker PT(*this, tok::l_paren); 1635 PT.consumeOpen(); 1636 1637 // TODO: Build AST. 1638 1639 switch (T) { 1640 default: llvm_unreachable("Not a builtin primary expression!"); 1641 case tok::kw___builtin_va_arg: { 1642 ExprResult Expr(ParseAssignmentExpression()); 1643 1644 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1645 Expr = ExprError(); 1646 1647 TypeResult Ty = ParseTypeName(); 1648 1649 if (Tok.isNot(tok::r_paren)) { 1650 Diag(Tok, diag::err_expected_rparen); 1651 Expr = ExprError(); 1652 } 1653 1654 if (Expr.isInvalid() || Ty.isInvalid()) 1655 Res = ExprError(); 1656 else 1657 Res = Actions.ActOnVAArg(StartLoc, Expr.take(), Ty.get(), ConsumeParen()); 1658 break; 1659 } 1660 case tok::kw___builtin_offsetof: { 1661 SourceLocation TypeLoc = Tok.getLocation(); 1662 TypeResult Ty = ParseTypeName(); 1663 if (Ty.isInvalid()) { 1664 SkipUntil(tok::r_paren); 1665 return ExprError(); 1666 } 1667 1668 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1669 return ExprError(); 1670 1671 // We must have at least one identifier here. 1672 if (Tok.isNot(tok::identifier)) { 1673 Diag(Tok, diag::err_expected_ident); 1674 SkipUntil(tok::r_paren); 1675 return ExprError(); 1676 } 1677 1678 // Keep track of the various subcomponents we see. 1679 SmallVector<Sema::OffsetOfComponent, 4> Comps; 1680 1681 Comps.push_back(Sema::OffsetOfComponent()); 1682 Comps.back().isBrackets = false; 1683 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1684 Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken(); 1685 1686 // FIXME: This loop leaks the index expressions on error. 1687 while (1) { 1688 if (Tok.is(tok::period)) { 1689 // offsetof-member-designator: offsetof-member-designator '.' identifier 1690 Comps.push_back(Sema::OffsetOfComponent()); 1691 Comps.back().isBrackets = false; 1692 Comps.back().LocStart = ConsumeToken(); 1693 1694 if (Tok.isNot(tok::identifier)) { 1695 Diag(Tok, diag::err_expected_ident); 1696 SkipUntil(tok::r_paren); 1697 return ExprError(); 1698 } 1699 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1700 Comps.back().LocEnd = ConsumeToken(); 1701 1702 } else if (Tok.is(tok::l_square)) { 1703 // offsetof-member-designator: offsetof-member-design '[' expression ']' 1704 Comps.push_back(Sema::OffsetOfComponent()); 1705 Comps.back().isBrackets = true; 1706 BalancedDelimiterTracker ST(*this, tok::l_square); 1707 ST.consumeOpen(); 1708 Comps.back().LocStart = ST.getOpenLocation(); 1709 Res = ParseExpression(); 1710 if (Res.isInvalid()) { 1711 SkipUntil(tok::r_paren); 1712 return move(Res); 1713 } 1714 Comps.back().U.E = Res.release(); 1715 1716 ST.consumeClose(); 1717 Comps.back().LocEnd = ST.getCloseLocation(); 1718 } else { 1719 if (Tok.isNot(tok::r_paren)) { 1720 PT.consumeClose(); 1721 Res = ExprError(); 1722 } else if (Ty.isInvalid()) { 1723 Res = ExprError(); 1724 } else { 1725 PT.consumeClose(); 1726 Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc, 1727 Ty.get(), &Comps[0], Comps.size(), 1728 PT.getCloseLocation()); 1729 } 1730 break; 1731 } 1732 } 1733 break; 1734 } 1735 case tok::kw___builtin_choose_expr: { 1736 ExprResult Cond(ParseAssignmentExpression()); 1737 if (Cond.isInvalid()) { 1738 SkipUntil(tok::r_paren); 1739 return move(Cond); 1740 } 1741 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1742 return ExprError(); 1743 1744 ExprResult Expr1(ParseAssignmentExpression()); 1745 if (Expr1.isInvalid()) { 1746 SkipUntil(tok::r_paren); 1747 return move(Expr1); 1748 } 1749 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1750 return ExprError(); 1751 1752 ExprResult Expr2(ParseAssignmentExpression()); 1753 if (Expr2.isInvalid()) { 1754 SkipUntil(tok::r_paren); 1755 return move(Expr2); 1756 } 1757 if (Tok.isNot(tok::r_paren)) { 1758 Diag(Tok, diag::err_expected_rparen); 1759 return ExprError(); 1760 } 1761 Res = Actions.ActOnChooseExpr(StartLoc, Cond.take(), Expr1.take(), 1762 Expr2.take(), ConsumeParen()); 1763 break; 1764 } 1765 case tok::kw___builtin_astype: { 1766 // The first argument is an expression to be converted, followed by a comma. 1767 ExprResult Expr(ParseAssignmentExpression()); 1768 if (Expr.isInvalid()) { 1769 SkipUntil(tok::r_paren); 1770 return ExprError(); 1771 } 1772 1773 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", 1774 tok::r_paren)) 1775 return ExprError(); 1776 1777 // Second argument is the type to bitcast to. 1778 TypeResult DestTy = ParseTypeName(); 1779 if (DestTy.isInvalid()) 1780 return ExprError(); 1781 1782 // Attempt to consume the r-paren. 1783 if (Tok.isNot(tok::r_paren)) { 1784 Diag(Tok, diag::err_expected_rparen); 1785 SkipUntil(tok::r_paren); 1786 return ExprError(); 1787 } 1788 1789 Res = Actions.ActOnAsTypeExpr(Expr.take(), DestTy.get(), StartLoc, 1790 ConsumeParen()); 1791 break; 1792 } 1793 } 1794 1795 if (Res.isInvalid()) 1796 return ExprError(); 1797 1798 // These can be followed by postfix-expr pieces because they are 1799 // primary-expressions. 1800 return ParsePostfixExpressionSuffix(Res.take()); 1801} 1802 1803/// ParseParenExpression - This parses the unit that starts with a '(' token, 1804/// based on what is allowed by ExprType. The actual thing parsed is returned 1805/// in ExprType. If stopIfCastExpr is true, it will only return the parsed type, 1806/// not the parsed cast-expression. 1807/// 1808/// primary-expression: [C99 6.5.1] 1809/// '(' expression ')' 1810/// [GNU] '(' compound-statement ')' (if !ParenExprOnly) 1811/// postfix-expression: [C99 6.5.2] 1812/// '(' type-name ')' '{' initializer-list '}' 1813/// '(' type-name ')' '{' initializer-list ',' '}' 1814/// cast-expression: [C99 6.5.4] 1815/// '(' type-name ')' cast-expression 1816/// [ARC] bridged-cast-expression 1817/// 1818/// [ARC] bridged-cast-expression: 1819/// (__bridge type-name) cast-expression 1820/// (__bridge_transfer type-name) cast-expression 1821/// (__bridge_retained type-name) cast-expression 1822ExprResult 1823Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr, 1824 bool isTypeCast, ParsedType &CastTy, 1825 SourceLocation &RParenLoc) { 1826 assert(Tok.is(tok::l_paren) && "Not a paren expr!"); 1827 GreaterThanIsOperatorScope G(GreaterThanIsOperator, true); 1828 BalancedDelimiterTracker T(*this, tok::l_paren); 1829 if (T.consumeOpen()) 1830 return ExprError(); 1831 SourceLocation OpenLoc = T.getOpenLocation(); 1832 1833 ExprResult Result(true); 1834 bool isAmbiguousTypeId; 1835 CastTy = ParsedType(); 1836 1837 if (Tok.is(tok::code_completion)) { 1838 Actions.CodeCompleteOrdinaryName(getCurScope(), 1839 ExprType >= CompoundLiteral? Sema::PCC_ParenthesizedExpression 1840 : Sema::PCC_Expression); 1841 cutOffParsing(); 1842 return ExprError(); 1843 } 1844 1845 // Diagnose use of bridge casts in non-arc mode. 1846 bool BridgeCast = (getLang().ObjC2 && 1847 (Tok.is(tok::kw___bridge) || 1848 Tok.is(tok::kw___bridge_transfer) || 1849 Tok.is(tok::kw___bridge_retained) || 1850 Tok.is(tok::kw___bridge_retain))); 1851 if (BridgeCast && !getLang().ObjCAutoRefCount) { 1852 StringRef BridgeCastName = Tok.getName(); 1853 SourceLocation BridgeKeywordLoc = ConsumeToken(); 1854 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc)) 1855 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_nonarc) 1856 << BridgeCastName 1857 << FixItHint::CreateReplacement(BridgeKeywordLoc, ""); 1858 BridgeCast = false; 1859 } 1860 1861 // None of these cases should fall through with an invalid Result 1862 // unless they've already reported an error. 1863 if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) { 1864 Diag(Tok, diag::ext_gnu_statement_expr); 1865 ParsedAttributes attrs(AttrFactory); 1866 StmtResult Stmt(ParseCompoundStatement(attrs, true)); 1867 ExprType = CompoundStmt; 1868 1869 // If the substmt parsed correctly, build the AST node. 1870 if (!Stmt.isInvalid()) 1871 Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.take(), Tok.getLocation()); 1872 } else if (ExprType >= CompoundLiteral && BridgeCast) { 1873 tok::TokenKind tokenKind = Tok.getKind(); 1874 SourceLocation BridgeKeywordLoc = ConsumeToken(); 1875 1876 // Parse an Objective-C ARC ownership cast expression. 1877 ObjCBridgeCastKind Kind; 1878 if (tokenKind == tok::kw___bridge) 1879 Kind = OBC_Bridge; 1880 else if (tokenKind == tok::kw___bridge_transfer) 1881 Kind = OBC_BridgeTransfer; 1882 else if (tokenKind == tok::kw___bridge_retained) 1883 Kind = OBC_BridgeRetained; 1884 else { 1885 // As a hopefully temporary workaround, allow __bridge_retain as 1886 // a synonym for __bridge_retained, but only in system headers. 1887 assert(tokenKind == tok::kw___bridge_retain); 1888 Kind = OBC_BridgeRetained; 1889 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc)) 1890 Diag(BridgeKeywordLoc, diag::err_arc_bridge_retain) 1891 << FixItHint::CreateReplacement(BridgeKeywordLoc, 1892 "__bridge_retained"); 1893 } 1894 1895 TypeResult Ty = ParseTypeName(); 1896 T.consumeClose(); 1897 RParenLoc = T.getCloseLocation(); 1898 ExprResult SubExpr = ParseCastExpression(/*isUnaryExpression=*/false); 1899 1900 if (Ty.isInvalid() || SubExpr.isInvalid()) 1901 return ExprError(); 1902 1903 return Actions.ActOnObjCBridgedCast(getCurScope(), OpenLoc, Kind, 1904 BridgeKeywordLoc, Ty.get(), 1905 RParenLoc, SubExpr.get()); 1906 } else if (ExprType >= CompoundLiteral && 1907 isTypeIdInParens(isAmbiguousTypeId)) { 1908 1909 // Otherwise, this is a compound literal expression or cast expression. 1910 1911 // In C++, if the type-id is ambiguous we disambiguate based on context. 1912 // If stopIfCastExpr is true the context is a typeof/sizeof/alignof 1913 // in which case we should treat it as type-id. 1914 // if stopIfCastExpr is false, we need to determine the context past the 1915 // parens, so we defer to ParseCXXAmbiguousParenExpression for that. 1916 if (isAmbiguousTypeId && !stopIfCastExpr) { 1917 ExprResult res = ParseCXXAmbiguousParenExpression(ExprType, CastTy, T); 1918 RParenLoc = T.getCloseLocation(); 1919 return res; 1920 } 1921 1922 // Parse the type declarator. 1923 DeclSpec DS(AttrFactory); 1924 ParseSpecifierQualifierList(DS); 1925 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 1926 ParseDeclarator(DeclaratorInfo); 1927 1928 // If our type is followed by an identifier and either ':' or ']', then 1929 // this is probably an Objective-C message send where the leading '[' is 1930 // missing. Recover as if that were the case. 1931 if (!DeclaratorInfo.isInvalidType() && Tok.is(tok::identifier) && 1932 !InMessageExpression && getLang().ObjC1 && 1933 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) { 1934 TypeResult Ty; 1935 { 1936 InMessageExpressionRAIIObject InMessage(*this, false); 1937 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 1938 } 1939 Result = ParseObjCMessageExpressionBody(SourceLocation(), 1940 SourceLocation(), 1941 Ty.get(), 0); 1942 } else { 1943 // Match the ')'. 1944 T.consumeClose(); 1945 RParenLoc = T.getCloseLocation(); 1946 if (Tok.is(tok::l_brace)) { 1947 ExprType = CompoundLiteral; 1948 TypeResult Ty; 1949 { 1950 InMessageExpressionRAIIObject InMessage(*this, false); 1951 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 1952 } 1953 return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc); 1954 } 1955 1956 if (ExprType == CastExpr) { 1957 // We parsed '(' type-name ')' and the thing after it wasn't a '{'. 1958 1959 if (DeclaratorInfo.isInvalidType()) 1960 return ExprError(); 1961 1962 // Note that this doesn't parse the subsequent cast-expression, it just 1963 // returns the parsed type to the callee. 1964 if (stopIfCastExpr) { 1965 TypeResult Ty; 1966 { 1967 InMessageExpressionRAIIObject InMessage(*this, false); 1968 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 1969 } 1970 CastTy = Ty.get(); 1971 return ExprResult(); 1972 } 1973 1974 // Reject the cast of super idiom in ObjC. 1975 if (Tok.is(tok::identifier) && getLang().ObjC1 && 1976 Tok.getIdentifierInfo() == Ident_super && 1977 getCurScope()->isInObjcMethodScope() && 1978 GetLookAheadToken(1).isNot(tok::period)) { 1979 Diag(Tok.getLocation(), diag::err_illegal_super_cast) 1980 << SourceRange(OpenLoc, RParenLoc); 1981 return ExprError(); 1982 } 1983 1984 // Parse the cast-expression that follows it next. 1985 // TODO: For cast expression with CastTy. 1986 Result = ParseCastExpression(/*isUnaryExpression=*/false, 1987 /*isAddressOfOperand=*/false, 1988 /*isTypeCast=*/IsTypeCast); 1989 if (!Result.isInvalid()) { 1990 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc, 1991 DeclaratorInfo, CastTy, 1992 RParenLoc, Result.take()); 1993 } 1994 return move(Result); 1995 } 1996 1997 Diag(Tok, diag::err_expected_lbrace_in_compound_literal); 1998 return ExprError(); 1999 } 2000 } else if (isTypeCast) { 2001 // Parse the expression-list. 2002 InMessageExpressionRAIIObject InMessage(*this, false); 2003 2004 ExprVector ArgExprs(Actions); 2005 CommaLocsTy CommaLocs; 2006 2007 if (!ParseExpressionList(ArgExprs, CommaLocs)) { 2008 ExprType = SimpleExpr; 2009 Result = Actions.ActOnParenListExpr(OpenLoc, Tok.getLocation(), 2010 move_arg(ArgExprs)); 2011 } 2012 } else { 2013 InMessageExpressionRAIIObject InMessage(*this, false); 2014 2015 Result = ParseExpression(MaybeTypeCast); 2016 ExprType = SimpleExpr; 2017 2018 // Don't build a paren expression unless we actually match a ')'. 2019 if (!Result.isInvalid() && Tok.is(tok::r_paren)) 2020 Result = Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.take()); 2021 } 2022 2023 // Match the ')'. 2024 if (Result.isInvalid()) { 2025 SkipUntil(tok::r_paren); 2026 return ExprError(); 2027 } 2028 2029 T.consumeClose(); 2030 RParenLoc = T.getCloseLocation(); 2031 return move(Result); 2032} 2033 2034/// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name 2035/// and we are at the left brace. 2036/// 2037/// postfix-expression: [C99 6.5.2] 2038/// '(' type-name ')' '{' initializer-list '}' 2039/// '(' type-name ')' '{' initializer-list ',' '}' 2040/// 2041ExprResult 2042Parser::ParseCompoundLiteralExpression(ParsedType Ty, 2043 SourceLocation LParenLoc, 2044 SourceLocation RParenLoc) { 2045 assert(Tok.is(tok::l_brace) && "Not a compound literal!"); 2046 if (!getLang().C99) // Compound literals don't exist in C90. 2047 Diag(LParenLoc, diag::ext_c99_compound_literal); 2048 ExprResult Result = ParseInitializer(); 2049 if (!Result.isInvalid() && Ty) 2050 return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.take()); 2051 return move(Result); 2052} 2053 2054/// ParseStringLiteralExpression - This handles the various token types that 2055/// form string literals, and also handles string concatenation [C99 5.1.1.2, 2056/// translation phase #6]. 2057/// 2058/// primary-expression: [C99 6.5.1] 2059/// string-literal 2060ExprResult Parser::ParseStringLiteralExpression() { 2061 assert(isTokenStringLiteral() && "Not a string literal!"); 2062 2063 // String concat. Note that keywords like __func__ and __FUNCTION__ are not 2064 // considered to be strings for concatenation purposes. 2065 SmallVector<Token, 4> StringToks; 2066 2067 do { 2068 StringToks.push_back(Tok); 2069 ConsumeStringToken(); 2070 } while (isTokenStringLiteral()); 2071 2072 // Pass the set of string tokens, ready for concatenation, to the actions. 2073 return Actions.ActOnStringLiteral(&StringToks[0], StringToks.size()); 2074} 2075 2076/// ParseGenericSelectionExpression - Parse a C11 generic-selection 2077/// [C11 6.5.1.1]. 2078/// 2079/// generic-selection: 2080/// _Generic ( assignment-expression , generic-assoc-list ) 2081/// generic-assoc-list: 2082/// generic-association 2083/// generic-assoc-list , generic-association 2084/// generic-association: 2085/// type-name : assignment-expression 2086/// default : assignment-expression 2087ExprResult Parser::ParseGenericSelectionExpression() { 2088 assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected"); 2089 SourceLocation KeyLoc = ConsumeToken(); 2090 2091 if (!getLang().C11) 2092 Diag(KeyLoc, diag::ext_c11_generic_selection); 2093 2094 BalancedDelimiterTracker T(*this, tok::l_paren); 2095 if (T.expectAndConsume(diag::err_expected_lparen)) 2096 return ExprError(); 2097 2098 ExprResult ControllingExpr; 2099 { 2100 // C11 6.5.1.1p3 "The controlling expression of a generic selection is 2101 // not evaluated." 2102 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 2103 ControllingExpr = ParseAssignmentExpression(); 2104 if (ControllingExpr.isInvalid()) { 2105 SkipUntil(tok::r_paren); 2106 return ExprError(); 2107 } 2108 } 2109 2110 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "")) { 2111 SkipUntil(tok::r_paren); 2112 return ExprError(); 2113 } 2114 2115 SourceLocation DefaultLoc; 2116 TypeVector Types(Actions); 2117 ExprVector Exprs(Actions); 2118 while (1) { 2119 ParsedType Ty; 2120 if (Tok.is(tok::kw_default)) { 2121 // C11 6.5.1.1p2 "A generic selection shall have no more than one default 2122 // generic association." 2123 if (!DefaultLoc.isInvalid()) { 2124 Diag(Tok, diag::err_duplicate_default_assoc); 2125 Diag(DefaultLoc, diag::note_previous_default_assoc); 2126 SkipUntil(tok::r_paren); 2127 return ExprError(); 2128 } 2129 DefaultLoc = ConsumeToken(); 2130 Ty = ParsedType(); 2131 } else { 2132 ColonProtectionRAIIObject X(*this); 2133 TypeResult TR = ParseTypeName(); 2134 if (TR.isInvalid()) { 2135 SkipUntil(tok::r_paren); 2136 return ExprError(); 2137 } 2138 Ty = TR.release(); 2139 } 2140 Types.push_back(Ty); 2141 2142 if (ExpectAndConsume(tok::colon, diag::err_expected_colon, "")) { 2143 SkipUntil(tok::r_paren); 2144 return ExprError(); 2145 } 2146 2147 // FIXME: These expressions should be parsed in a potentially potentially 2148 // evaluated context. 2149 ExprResult ER(ParseAssignmentExpression()); 2150 if (ER.isInvalid()) { 2151 SkipUntil(tok::r_paren); 2152 return ExprError(); 2153 } 2154 Exprs.push_back(ER.release()); 2155 2156 if (Tok.isNot(tok::comma)) 2157 break; 2158 ConsumeToken(); 2159 } 2160 2161 T.consumeClose(); 2162 if (T.getCloseLocation().isInvalid()) 2163 return ExprError(); 2164 2165 return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc, 2166 T.getCloseLocation(), 2167 ControllingExpr.release(), 2168 move_arg(Types), move_arg(Exprs)); 2169} 2170 2171/// ParseExpressionList - Used for C/C++ (argument-)expression-list. 2172/// 2173/// argument-expression-list: 2174/// assignment-expression 2175/// argument-expression-list , assignment-expression 2176/// 2177/// [C++] expression-list: 2178/// [C++] assignment-expression 2179/// [C++] expression-list , assignment-expression 2180/// 2181/// [C++0x] expression-list: 2182/// [C++0x] initializer-list 2183/// 2184/// [C++0x] initializer-list 2185/// [C++0x] initializer-clause ...[opt] 2186/// [C++0x] initializer-list , initializer-clause ...[opt] 2187/// 2188/// [C++0x] initializer-clause: 2189/// [C++0x] assignment-expression 2190/// [C++0x] braced-init-list 2191/// 2192bool Parser::ParseExpressionList(SmallVectorImpl<Expr*> &Exprs, 2193 SmallVectorImpl<SourceLocation> &CommaLocs, 2194 void (Sema::*Completer)(Scope *S, 2195 Expr *Data, 2196 Expr **Args, 2197 unsigned NumArgs), 2198 Expr *Data) { 2199 while (1) { 2200 if (Tok.is(tok::code_completion)) { 2201 if (Completer) 2202 (Actions.*Completer)(getCurScope(), Data, Exprs.data(), Exprs.size()); 2203 else 2204 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 2205 cutOffParsing(); 2206 return true; 2207 } 2208 2209 ExprResult Expr; 2210 if (getLang().CPlusPlus0x && Tok.is(tok::l_brace)) { 2211 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists); 2212 Expr = ParseBraceInitializer(); 2213 } else 2214 Expr = ParseAssignmentExpression(); 2215 2216 if (Tok.is(tok::ellipsis)) 2217 Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken()); 2218 if (Expr.isInvalid()) 2219 return true; 2220 2221 Exprs.push_back(Expr.release()); 2222 2223 if (Tok.isNot(tok::comma)) 2224 return false; 2225 // Move to the next argument, remember where the comma was. 2226 CommaLocs.push_back(ConsumeToken()); 2227 } 2228} 2229 2230/// ParseBlockId - Parse a block-id, which roughly looks like int (int x). 2231/// 2232/// [clang] block-id: 2233/// [clang] specifier-qualifier-list block-declarator 2234/// 2235void Parser::ParseBlockId() { 2236 if (Tok.is(tok::code_completion)) { 2237 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type); 2238 return cutOffParsing(); 2239 } 2240 2241 // Parse the specifier-qualifier-list piece. 2242 DeclSpec DS(AttrFactory); 2243 ParseSpecifierQualifierList(DS); 2244 2245 // Parse the block-declarator. 2246 Declarator DeclaratorInfo(DS, Declarator::BlockLiteralContext); 2247 ParseDeclarator(DeclaratorInfo); 2248 2249 // We do this for: ^ __attribute__((noreturn)) {, as DS has the attributes. 2250 DeclaratorInfo.takeAttributes(DS.getAttributes(), SourceLocation()); 2251 2252 MaybeParseGNUAttributes(DeclaratorInfo); 2253 2254 // Inform sema that we are starting a block. 2255 Actions.ActOnBlockArguments(DeclaratorInfo, getCurScope()); 2256} 2257 2258/// ParseBlockLiteralExpression - Parse a block literal, which roughly looks 2259/// like ^(int x){ return x+1; } 2260/// 2261/// block-literal: 2262/// [clang] '^' block-args[opt] compound-statement 2263/// [clang] '^' block-id compound-statement 2264/// [clang] block-args: 2265/// [clang] '(' parameter-list ')' 2266/// 2267ExprResult Parser::ParseBlockLiteralExpression() { 2268 assert(Tok.is(tok::caret) && "block literal starts with ^"); 2269 SourceLocation CaretLoc = ConsumeToken(); 2270 2271 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc, 2272 "block literal parsing"); 2273 2274 // Enter a scope to hold everything within the block. This includes the 2275 // argument decls, decls within the compound expression, etc. This also 2276 // allows determining whether a variable reference inside the block is 2277 // within or outside of the block. 2278 ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope | 2279 Scope::BreakScope | Scope::ContinueScope | 2280 Scope::DeclScope); 2281 2282 // Inform sema that we are starting a block. 2283 Actions.ActOnBlockStart(CaretLoc, getCurScope()); 2284 2285 // Parse the return type if present. 2286 DeclSpec DS(AttrFactory); 2287 Declarator ParamInfo(DS, Declarator::BlockLiteralContext); 2288 // FIXME: Since the return type isn't actually parsed, it can't be used to 2289 // fill ParamInfo with an initial valid range, so do it manually. 2290 ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation())); 2291 2292 // If this block has arguments, parse them. There is no ambiguity here with 2293 // the expression case, because the expression case requires a parameter list. 2294 if (Tok.is(tok::l_paren)) { 2295 ParseParenDeclarator(ParamInfo); 2296 // Parse the pieces after the identifier as if we had "int(...)". 2297 // SetIdentifier sets the source range end, but in this case we're past 2298 // that location. 2299 SourceLocation Tmp = ParamInfo.getSourceRange().getEnd(); 2300 ParamInfo.SetIdentifier(0, CaretLoc); 2301 ParamInfo.SetRangeEnd(Tmp); 2302 if (ParamInfo.isInvalidType()) { 2303 // If there was an error parsing the arguments, they may have 2304 // tried to use ^(x+y) which requires an argument list. Just 2305 // skip the whole block literal. 2306 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2307 return ExprError(); 2308 } 2309 2310 MaybeParseGNUAttributes(ParamInfo); 2311 2312 // Inform sema that we are starting a block. 2313 Actions.ActOnBlockArguments(ParamInfo, getCurScope()); 2314 } else if (!Tok.is(tok::l_brace)) { 2315 ParseBlockId(); 2316 } else { 2317 // Otherwise, pretend we saw (void). 2318 ParsedAttributes attrs(AttrFactory); 2319 ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(true, false, 2320 SourceLocation(), 2321 0, 0, 0, 2322 true, SourceLocation(), 2323 SourceLocation(), 2324 SourceLocation(), 2325 SourceLocation(), 2326 EST_None, 2327 SourceLocation(), 2328 0, 0, 0, 0, 2329 CaretLoc, CaretLoc, 2330 ParamInfo), 2331 attrs, CaretLoc); 2332 2333 MaybeParseGNUAttributes(ParamInfo); 2334 2335 // Inform sema that we are starting a block. 2336 Actions.ActOnBlockArguments(ParamInfo, getCurScope()); 2337 } 2338 2339 2340 ExprResult Result(true); 2341 if (!Tok.is(tok::l_brace)) { 2342 // Saw something like: ^expr 2343 Diag(Tok, diag::err_expected_expression); 2344 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2345 return ExprError(); 2346 } 2347 2348 StmtResult Stmt(ParseCompoundStatementBody()); 2349 BlockScope.Exit(); 2350 if (!Stmt.isInvalid()) 2351 Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.take(), getCurScope()); 2352 else 2353 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2354 return move(Result); 2355} 2356