ParseExpr.cpp revision 857736454fabeb828e399dce094bbb3aad64fba2
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/Basic/PrettyStackTrace.h" 27#include "RAIIObjectsForParser.h" 28#include "llvm/ADT/SmallVector.h" 29#include "llvm/ADT/SmallString.h" 30using namespace clang; 31 32/// getBinOpPrecedence - Return the precedence of the specified binary operator 33/// token. 34static prec::Level getBinOpPrecedence(tok::TokenKind Kind, 35 bool GreaterThanIsOperator, 36 bool CPlusPlus0x) { 37 switch (Kind) { 38 case tok::greater: 39 // C++ [temp.names]p3: 40 // [...] When parsing a template-argument-list, the first 41 // non-nested > is taken as the ending delimiter rather than a 42 // greater-than operator. [...] 43 if (GreaterThanIsOperator) 44 return prec::Relational; 45 return prec::Unknown; 46 47 case tok::greatergreater: 48 // C++0x [temp.names]p3: 49 // 50 // [...] Similarly, the first non-nested >> is treated as two 51 // consecutive but distinct > tokens, the first of which is 52 // taken as the end of the template-argument-list and completes 53 // the template-id. [...] 54 if (GreaterThanIsOperator || !CPlusPlus0x) 55 return prec::Shift; 56 return prec::Unknown; 57 58 default: return prec::Unknown; 59 case tok::comma: return prec::Comma; 60 case tok::equal: 61 case tok::starequal: 62 case tok::slashequal: 63 case tok::percentequal: 64 case tok::plusequal: 65 case tok::minusequal: 66 case tok::lesslessequal: 67 case tok::greatergreaterequal: 68 case tok::ampequal: 69 case tok::caretequal: 70 case tok::pipeequal: return prec::Assignment; 71 case tok::question: return prec::Conditional; 72 case tok::pipepipe: return prec::LogicalOr; 73 case tok::ampamp: return prec::LogicalAnd; 74 case tok::pipe: return prec::InclusiveOr; 75 case tok::caret: return prec::ExclusiveOr; 76 case tok::amp: return prec::And; 77 case tok::exclaimequal: 78 case tok::equalequal: return prec::Equality; 79 case tok::lessequal: 80 case tok::less: 81 case tok::greaterequal: return prec::Relational; 82 case tok::lessless: return prec::Shift; 83 case tok::plus: 84 case tok::minus: return prec::Additive; 85 case tok::percent: 86 case tok::slash: 87 case tok::star: return prec::Multiplicative; 88 case tok::periodstar: 89 case tok::arrowstar: return prec::PointerToMember; 90 } 91} 92 93 94/// ParseExpression - Simple precedence-based parser for binary/ternary 95/// operators. 96/// 97/// Note: we diverge from the C99 grammar when parsing the assignment-expression 98/// production. C99 specifies that the LHS of an assignment operator should be 99/// parsed as a unary-expression, but consistency dictates that it be a 100/// conditional-expession. In practice, the important thing here is that the 101/// LHS of an assignment has to be an l-value, which productions between 102/// unary-expression and conditional-expression don't produce. Because we want 103/// consistency, we parse the LHS as a conditional-expression, then check for 104/// l-value-ness in semantic analysis stages. 105/// 106/// pm-expression: [C++ 5.5] 107/// cast-expression 108/// pm-expression '.*' cast-expression 109/// pm-expression '->*' cast-expression 110/// 111/// multiplicative-expression: [C99 6.5.5] 112/// Note: in C++, apply pm-expression instead of cast-expression 113/// cast-expression 114/// multiplicative-expression '*' cast-expression 115/// multiplicative-expression '/' cast-expression 116/// multiplicative-expression '%' cast-expression 117/// 118/// additive-expression: [C99 6.5.6] 119/// multiplicative-expression 120/// additive-expression '+' multiplicative-expression 121/// additive-expression '-' multiplicative-expression 122/// 123/// shift-expression: [C99 6.5.7] 124/// additive-expression 125/// shift-expression '<<' additive-expression 126/// shift-expression '>>' additive-expression 127/// 128/// relational-expression: [C99 6.5.8] 129/// shift-expression 130/// relational-expression '<' shift-expression 131/// relational-expression '>' shift-expression 132/// relational-expression '<=' shift-expression 133/// relational-expression '>=' shift-expression 134/// 135/// equality-expression: [C99 6.5.9] 136/// relational-expression 137/// equality-expression '==' relational-expression 138/// equality-expression '!=' relational-expression 139/// 140/// AND-expression: [C99 6.5.10] 141/// equality-expression 142/// AND-expression '&' equality-expression 143/// 144/// exclusive-OR-expression: [C99 6.5.11] 145/// AND-expression 146/// exclusive-OR-expression '^' AND-expression 147/// 148/// inclusive-OR-expression: [C99 6.5.12] 149/// exclusive-OR-expression 150/// inclusive-OR-expression '|' exclusive-OR-expression 151/// 152/// logical-AND-expression: [C99 6.5.13] 153/// inclusive-OR-expression 154/// logical-AND-expression '&&' inclusive-OR-expression 155/// 156/// logical-OR-expression: [C99 6.5.14] 157/// logical-AND-expression 158/// logical-OR-expression '||' logical-AND-expression 159/// 160/// conditional-expression: [C99 6.5.15] 161/// logical-OR-expression 162/// logical-OR-expression '?' expression ':' conditional-expression 163/// [GNU] logical-OR-expression '?' ':' conditional-expression 164/// [C++] the third operand is an assignment-expression 165/// 166/// assignment-expression: [C99 6.5.16] 167/// conditional-expression 168/// unary-expression assignment-operator assignment-expression 169/// [C++] throw-expression [C++ 15] 170/// 171/// assignment-operator: one of 172/// = *= /= %= += -= <<= >>= &= ^= |= 173/// 174/// expression: [C99 6.5.17] 175/// assignment-expression 176/// expression ',' assignment-expression 177/// 178ExprResult Parser::ParseExpression() { 179 ExprResult LHS(ParseAssignmentExpression()); 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. 215/// 216ExprResult Parser::ParseAssignmentExpression() { 217 if (Tok.is(tok::code_completion)) { 218 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 219 ConsumeCodeCompletionToken(); 220 } 221 222 if (Tok.is(tok::kw_throw)) 223 return ParseThrowExpression(); 224 225 ExprResult LHS(ParseCastExpression(false)); 226 return ParseRHSOfBinaryExpression(move(LHS), prec::Assignment); 227} 228 229/// ParseAssignmentExprWithObjCMessageExprStart - Parse an assignment expression 230/// where part of an objc message send has already been parsed. In this case 231/// LBracLoc indicates the location of the '[' of the message send, and either 232/// ReceiverName or ReceiverExpr is non-null indicating the receiver of the 233/// message. 234/// 235/// Since this handles full assignment-expression's, it handles postfix 236/// expressions and other binary operators for these expressions as well. 237ExprResult 238Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc, 239 SourceLocation SuperLoc, 240 ParsedType ReceiverType, 241 Expr *ReceiverExpr) { 242 ExprResult R 243 = ParseObjCMessageExpressionBody(LBracLoc, SuperLoc, 244 ReceiverType, ReceiverExpr); 245 R = ParsePostfixExpressionSuffix(R); 246 return ParseRHSOfBinaryExpression(R, prec::Assignment); 247} 248 249 250ExprResult Parser::ParseConstantExpression() { 251 // C++ [basic.def.odr]p2: 252 // An expression is potentially evaluated unless it appears where an 253 // integral constant expression is required (see 5.19) [...]. 254 EnterExpressionEvaluationContext Unevaluated(Actions, 255 Sema::Unevaluated); 256 257 ExprResult LHS(ParseCastExpression(false)); 258 return ParseRHSOfBinaryExpression(LHS, prec::Conditional); 259} 260 261/// ParseRHSOfBinaryExpression - Parse a binary expression that starts with 262/// LHS and has a precedence of at least MinPrec. 263ExprResult 264Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) { 265 prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(), 266 GreaterThanIsOperator, 267 getLang().CPlusPlus0x); 268 SourceLocation ColonLoc; 269 270 while (1) { 271 // If this token has a lower precedence than we are allowed to parse (e.g. 272 // because we are called recursively, or because the token is not a binop), 273 // then we are done! 274 if (NextTokPrec < MinPrec) 275 return move(LHS); 276 277 // Consume the operator, saving the operator token for error reporting. 278 Token OpToken = Tok; 279 ConsumeToken(); 280 281 // Special case handling for the ternary operator. 282 ExprResult TernaryMiddle(true); 283 if (NextTokPrec == prec::Conditional) { 284 if (Tok.isNot(tok::colon)) { 285 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 286 ColonProtectionRAIIObject X(*this); 287 288 // Handle this production specially: 289 // logical-OR-expression '?' expression ':' conditional-expression 290 // In particular, the RHS of the '?' is 'expression', not 291 // 'logical-OR-expression' as we might expect. 292 TernaryMiddle = ParseExpression(); 293 if (TernaryMiddle.isInvalid()) { 294 LHS = ExprError(); 295 TernaryMiddle = 0; 296 } 297 } else { 298 // Special case handling of "X ? Y : Z" where Y is empty: 299 // logical-OR-expression '?' ':' conditional-expression [GNU] 300 TernaryMiddle = 0; 301 Diag(Tok, diag::ext_gnu_conditional_expr); 302 } 303 304 if (Tok.is(tok::colon)) { 305 // Eat the colon. 306 ColonLoc = ConsumeToken(); 307 } else { 308 // Otherwise, we're missing a ':'. Assume that this was a typo that the 309 // user forgot. If we're not in a macro instantion, we can suggest a 310 // fixit hint. If there were two spaces before the current token, 311 // suggest inserting the colon in between them, otherwise insert ": ". 312 SourceLocation FILoc = Tok.getLocation(); 313 const char *FIText = ": "; 314 if (FILoc.isFileID()) { 315 const SourceManager &SM = PP.getSourceManager(); 316 bool IsInvalid = false; 317 const char *SourcePtr = 318 SM.getCharacterData(FILoc.getFileLocWithOffset(-1), &IsInvalid); 319 if (!IsInvalid && *SourcePtr == ' ') { 320 SourcePtr = 321 SM.getCharacterData(FILoc.getFileLocWithOffset(-2), &IsInvalid); 322 if (!IsInvalid && *SourcePtr == ' ') { 323 FILoc = FILoc.getFileLocWithOffset(-1); 324 FIText = ":"; 325 } 326 } 327 } 328 329 Diag(Tok, diag::err_expected_colon) 330 << FixItHint::CreateInsertion(FILoc, FIText); 331 Diag(OpToken, diag::note_matching) << "?"; 332 ColonLoc = Tok.getLocation(); 333 } 334 } 335 336 // Code completion for the right-hand side of an assignment expression 337 // goes through a special hook that takes the left-hand side into account. 338 if (Tok.is(tok::code_completion) && NextTokPrec == prec::Assignment) { 339 Actions.CodeCompleteAssignmentRHS(getCurScope(), LHS.get()); 340 ConsumeCodeCompletionToken(); 341 return ExprError(); 342 } 343 344 // Parse another leaf here for the RHS of the operator. 345 // ParseCastExpression works here because all RHS expressions in C have it 346 // as a prefix, at least. However, in C++, an assignment-expression could 347 // be a throw-expression, which is not a valid cast-expression. 348 // Therefore we need some special-casing here. 349 // Also note that the third operand of the conditional operator is 350 // an assignment-expression in C++. 351 ExprResult RHS; 352 if (getLang().CPlusPlus && NextTokPrec <= prec::Conditional) 353 RHS = ParseAssignmentExpression(); 354 else 355 RHS = ParseCastExpression(false); 356 357 if (RHS.isInvalid()) 358 LHS = ExprError(); 359 360 // Remember the precedence of this operator and get the precedence of the 361 // operator immediately to the right of the RHS. 362 prec::Level ThisPrec = NextTokPrec; 363 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 364 getLang().CPlusPlus0x); 365 366 // Assignment and conditional expressions are right-associative. 367 bool isRightAssoc = ThisPrec == prec::Conditional || 368 ThisPrec == prec::Assignment; 369 370 // Get the precedence of the operator to the right of the RHS. If it binds 371 // more tightly with RHS than we do, evaluate it completely first. 372 if (ThisPrec < NextTokPrec || 373 (ThisPrec == NextTokPrec && isRightAssoc)) { 374 // If this is left-associative, only parse things on the RHS that bind 375 // more tightly than the current operator. If it is left-associative, it 376 // is okay, to bind exactly as tightly. For example, compile A=B=C=D as 377 // A=(B=(C=D)), where each paren is a level of recursion here. 378 // The function takes ownership of the RHS. 379 RHS = ParseRHSOfBinaryExpression(RHS, 380 static_cast<prec::Level>(ThisPrec + !isRightAssoc)); 381 382 if (RHS.isInvalid()) 383 LHS = ExprError(); 384 385 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 386 getLang().CPlusPlus0x); 387 } 388 assert(NextTokPrec <= ThisPrec && "Recursion didn't work!"); 389 390 if (!LHS.isInvalid()) { 391 // Combine the LHS and RHS into the LHS (e.g. build AST). 392 if (TernaryMiddle.isInvalid()) { 393 // If we're using '>>' as an operator within a template 394 // argument list (in C++98), suggest the addition of 395 // parentheses so that the code remains well-formed in C++0x. 396 if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater)) 397 SuggestParentheses(OpToken.getLocation(), 398 diag::warn_cxx0x_right_shift_in_template_arg, 399 SourceRange(Actions.getExprRange(LHS.get()).getBegin(), 400 Actions.getExprRange(RHS.get()).getEnd())); 401 402 LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(), 403 OpToken.getKind(), LHS.take(), RHS.take()); 404 } else 405 LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc, 406 LHS.take(), TernaryMiddle.take(), 407 RHS.take()); 408 } 409 } 410} 411 412/// ParseCastExpression - Parse a cast-expression, or, if isUnaryExpression is 413/// true, parse a unary-expression. isAddressOfOperand exists because an 414/// id-expression that is the operand of address-of gets special treatment 415/// due to member pointers. 416/// 417ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 418 bool isAddressOfOperand, 419 ParsedType TypeOfCast) { 420 bool NotCastExpr; 421 ExprResult Res = ParseCastExpression(isUnaryExpression, 422 isAddressOfOperand, 423 NotCastExpr, 424 TypeOfCast); 425 if (NotCastExpr) 426 Diag(Tok, diag::err_expected_expression); 427 return move(Res); 428} 429 430/// ParseCastExpression - Parse a cast-expression, or, if isUnaryExpression is 431/// true, parse a unary-expression. isAddressOfOperand exists because an 432/// id-expression that is the operand of address-of gets special treatment 433/// due to member pointers. NotCastExpr is set to true if the token is not the 434/// start of a cast-expression, and no diagnostic is emitted in this case. 435/// 436/// cast-expression: [C99 6.5.4] 437/// unary-expression 438/// '(' type-name ')' cast-expression 439/// 440/// unary-expression: [C99 6.5.3] 441/// postfix-expression 442/// '++' unary-expression 443/// '--' unary-expression 444/// unary-operator cast-expression 445/// 'sizeof' unary-expression 446/// 'sizeof' '(' type-name ')' 447/// [GNU] '__alignof' unary-expression 448/// [GNU] '__alignof' '(' type-name ')' 449/// [C++0x] 'alignof' '(' type-id ')' 450/// [GNU] '&&' identifier 451/// [C++] new-expression 452/// [C++] delete-expression 453/// [C++0x] 'noexcept' '(' expression ')' 454/// 455/// unary-operator: one of 456/// '&' '*' '+' '-' '~' '!' 457/// [GNU] '__extension__' '__real' '__imag' 458/// 459/// primary-expression: [C99 6.5.1] 460/// [C99] identifier 461/// [C++] id-expression 462/// constant 463/// string-literal 464/// [C++] boolean-literal [C++ 2.13.5] 465/// [C++0x] 'nullptr' [C++0x 2.14.7] 466/// '(' expression ')' 467/// '__func__' [C99 6.4.2.2] 468/// [GNU] '__FUNCTION__' 469/// [GNU] '__PRETTY_FUNCTION__' 470/// [GNU] '(' compound-statement ')' 471/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 472/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 473/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 474/// assign-expr ')' 475/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 476/// [GNU] '__null' 477/// [OBJC] '[' objc-message-expr ']' 478/// [OBJC] '@selector' '(' objc-selector-arg ')' 479/// [OBJC] '@protocol' '(' identifier ')' 480/// [OBJC] '@encode' '(' type-name ')' 481/// [OBJC] objc-string-literal 482/// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 483/// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 484/// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 485/// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 486/// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 487/// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 488/// [C++] 'typeid' '(' expression ')' [C++ 5.2p1] 489/// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1] 490/// [C++] 'this' [C++ 9.3.2] 491/// [G++] unary-type-trait '(' type-id ')' 492/// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO] 493/// [clang] '^' block-literal 494/// 495/// constant: [C99 6.4.4] 496/// integer-constant 497/// floating-constant 498/// enumeration-constant -> identifier 499/// character-constant 500/// 501/// id-expression: [C++ 5.1] 502/// unqualified-id 503/// qualified-id 504/// 505/// unqualified-id: [C++ 5.1] 506/// identifier 507/// operator-function-id 508/// conversion-function-id 509/// '~' class-name 510/// template-id 511/// 512/// new-expression: [C++ 5.3.4] 513/// '::'[opt] 'new' new-placement[opt] new-type-id 514/// new-initializer[opt] 515/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 516/// new-initializer[opt] 517/// 518/// delete-expression: [C++ 5.3.5] 519/// '::'[opt] 'delete' cast-expression 520/// '::'[opt] 'delete' '[' ']' cast-expression 521/// 522/// [GNU] unary-type-trait: 523/// '__has_nothrow_assign' 524/// '__has_nothrow_copy' 525/// '__has_nothrow_constructor' 526/// '__has_trivial_assign' [TODO] 527/// '__has_trivial_copy' [TODO] 528/// '__has_trivial_constructor' 529/// '__has_trivial_destructor' 530/// '__has_virtual_destructor' 531/// '__is_abstract' [TODO] 532/// '__is_class' 533/// '__is_empty' [TODO] 534/// '__is_enum' 535/// '__is_pod' 536/// '__is_polymorphic' 537/// '__is_union' 538/// 539/// [GNU] binary-type-trait: 540/// '__is_base_of' [TODO] 541/// 542ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 543 bool isAddressOfOperand, 544 bool &NotCastExpr, 545 ParsedType TypeOfCast) { 546 ExprResult Res; 547 tok::TokenKind SavedKind = Tok.getKind(); 548 NotCastExpr = false; 549 550 // This handles all of cast-expression, unary-expression, postfix-expression, 551 // and primary-expression. We handle them together like this for efficiency 552 // and to simplify handling of an expression starting with a '(' token: which 553 // may be one of a parenthesized expression, cast-expression, compound literal 554 // expression, or statement expression. 555 // 556 // If the parsed tokens consist of a primary-expression, the cases below 557 // break out of the switch; at the end we call ParsePostfixExpressionSuffix 558 // to handle the postfix expression suffixes. Cases that cannot be followed 559 // by postfix exprs should return without invoking 560 // ParsePostfixExpressionSuffix. 561 switch (SavedKind) { 562 case tok::l_paren: { 563 // If this expression is limited to being a unary-expression, the parent can 564 // not start a cast expression. 565 ParenParseOption ParenExprType = 566 (isUnaryExpression && !getLang().CPlusPlus)? CompoundLiteral : CastExpr; 567 ParsedType CastTy; 568 SourceLocation LParenLoc = Tok.getLocation(); 569 SourceLocation RParenLoc; 570 571 { 572 // The inside of the parens don't need to be a colon protected scope, and 573 // isn't immediately a message send. 574 ColonProtectionRAIIObject X(*this, false); 575 576 Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/, 577 TypeOfCast, CastTy, RParenLoc); 578 } 579 580 switch (ParenExprType) { 581 case SimpleExpr: break; // Nothing else to do. 582 case CompoundStmt: break; // Nothing else to do. 583 case CompoundLiteral: 584 // We parsed '(' type-name ')' '{' ... '}'. If any suffixes of 585 // postfix-expression exist, parse them now. 586 break; 587 case CastExpr: 588 // We have parsed the cast-expression and no postfix-expr pieces are 589 // following. 590 return move(Res); 591 } 592 593 break; 594 } 595 596 // primary-expression 597 case tok::numeric_constant: 598 // constant: integer-constant 599 // constant: floating-constant 600 601 Res = Actions.ActOnNumericConstant(Tok); 602 ConsumeToken(); 603 break; 604 605 case tok::kw_true: 606 case tok::kw_false: 607 return ParseCXXBoolLiteral(); 608 609 case tok::kw_nullptr: 610 return Actions.ActOnCXXNullPtrLiteral(ConsumeToken()); 611 612 case tok::identifier: { // primary-expression: identifier 613 // unqualified-id: identifier 614 // constant: enumeration-constant 615 // Turn a potentially qualified name into a annot_typename or 616 // annot_cxxscope if it would be valid. This handles things like x::y, etc. 617 if (getLang().CPlusPlus) { 618 // Avoid the unnecessary parse-time lookup in the common case 619 // where the syntax forbids a type. 620 const Token &Next = NextToken(); 621 if (Next.is(tok::coloncolon) || 622 (!ColonIsSacred && Next.is(tok::colon)) || 623 Next.is(tok::less) || 624 Next.is(tok::l_paren)) { 625 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 626 if (TryAnnotateTypeOrScopeToken()) 627 return ExprError(); 628 if (!Tok.is(tok::identifier)) 629 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 630 } 631 } 632 633 // Consume the identifier so that we can see if it is followed by a '(' or 634 // '.'. 635 IdentifierInfo &II = *Tok.getIdentifierInfo(); 636 SourceLocation ILoc = ConsumeToken(); 637 638 // Support 'Class.property' and 'super.property' notation. 639 if (getLang().ObjC1 && Tok.is(tok::period) && 640 (Actions.getTypeName(II, ILoc, getCurScope()) || 641 // Allow the base to be 'super' if in an objc-method. 642 (&II == Ident_super && getCurScope()->isInObjcMethodScope()))) { 643 SourceLocation DotLoc = ConsumeToken(); 644 645 if (Tok.isNot(tok::identifier)) { 646 Diag(Tok, diag::err_expected_property_name); 647 return ExprError(); 648 } 649 IdentifierInfo &PropertyName = *Tok.getIdentifierInfo(); 650 SourceLocation PropertyLoc = ConsumeToken(); 651 652 Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName, 653 ILoc, PropertyLoc); 654 break; 655 } 656 657 // In an Objective-C method, if we have "super" followed by an identifier, 658 // the token sequence is ill-formed. However, if there's a ':' or ']' after 659 // that identifier, this is probably a message send with a missing open 660 // bracket. Treat it as such. 661 if (getLang().ObjC1 && &II == Ident_super && !InMessageExpression && 662 getCurScope()->isInObjcMethodScope() && 663 ((Tok.is(tok::identifier) && 664 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) || 665 Tok.is(tok::code_completion))) { 666 Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, ParsedType(), 667 0); 668 break; 669 } 670 671 // If we have an Objective-C class name followed by an identifier and 672 // either ':' or ']', this is an Objective-C class message send that's 673 // missing the opening '['. Recovery appropriately. 674 if (getLang().ObjC1 && Tok.is(tok::identifier) && !InMessageExpression) { 675 const Token& Next = NextToken(); 676 if (Next.is(tok::colon) || Next.is(tok::r_square)) 677 if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope())) 678 if (Typ.get()->isObjCObjectOrInterfaceType()) { 679 // Fake up a Declarator to use with ActOnTypeName. 680 DeclSpec DS; 681 DS.SetRangeStart(ILoc); 682 DS.SetRangeEnd(ILoc); 683 const char *PrevSpec = 0; 684 unsigned DiagID; 685 DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ); 686 687 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 688 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), 689 DeclaratorInfo); 690 if (Ty.isInvalid()) 691 break; 692 693 Res = ParseObjCMessageExpressionBody(SourceLocation(), 694 SourceLocation(), 695 Ty.get(), 0); 696 break; 697 } 698 } 699 700 // Make sure to pass down the right value for isAddressOfOperand. 701 if (isAddressOfOperand && isPostfixExpressionSuffixStart()) 702 isAddressOfOperand = false; 703 704 // Function designators are allowed to be undeclared (C99 6.5.1p2), so we 705 // need to know whether or not this identifier is a function designator or 706 // not. 707 UnqualifiedId Name; 708 CXXScopeSpec ScopeSpec; 709 Name.setIdentifier(&II, ILoc); 710 Res = Actions.ActOnIdExpression(getCurScope(), ScopeSpec, Name, 711 Tok.is(tok::l_paren), isAddressOfOperand); 712 break; 713 } 714 case tok::char_constant: // constant: character-constant 715 Res = Actions.ActOnCharacterConstant(Tok); 716 ConsumeToken(); 717 break; 718 case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2] 719 case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU] 720 case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU] 721 Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind); 722 ConsumeToken(); 723 break; 724 case tok::string_literal: // primary-expression: string-literal 725 case tok::wide_string_literal: 726 Res = ParseStringLiteralExpression(); 727 break; 728 case tok::kw___builtin_va_arg: 729 case tok::kw___builtin_offsetof: 730 case tok::kw___builtin_choose_expr: 731 case tok::kw___builtin_types_compatible_p: 732 return ParseBuiltinPrimaryExpression(); 733 case tok::kw___null: 734 return Actions.ActOnGNUNullExpr(ConsumeToken()); 735 break; 736 case tok::plusplus: // unary-expression: '++' unary-expression [C99] 737 case tok::minusminus: { // unary-expression: '--' unary-expression [C99] 738 // C++ [expr.unary] has: 739 // unary-expression: 740 // ++ cast-expression 741 // -- cast-expression 742 SourceLocation SavedLoc = ConsumeToken(); 743 Res = ParseCastExpression(!getLang().CPlusPlus); 744 if (!Res.isInvalid()) 745 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 746 return move(Res); 747 } 748 case tok::amp: { // unary-expression: '&' cast-expression 749 // Special treatment because of member pointers 750 SourceLocation SavedLoc = ConsumeToken(); 751 Res = ParseCastExpression(false, true); 752 if (!Res.isInvalid()) 753 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 754 return move(Res); 755 } 756 757 case tok::star: // unary-expression: '*' cast-expression 758 case tok::plus: // unary-expression: '+' cast-expression 759 case tok::minus: // unary-expression: '-' cast-expression 760 case tok::tilde: // unary-expression: '~' cast-expression 761 case tok::exclaim: // unary-expression: '!' cast-expression 762 case tok::kw___real: // unary-expression: '__real' cast-expression [GNU] 763 case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU] 764 SourceLocation SavedLoc = ConsumeToken(); 765 Res = ParseCastExpression(false); 766 if (!Res.isInvalid()) 767 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 768 return move(Res); 769 } 770 771 case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU] 772 // __extension__ silences extension warnings in the subexpression. 773 ExtensionRAIIObject O(Diags); // Use RAII to do this. 774 SourceLocation SavedLoc = ConsumeToken(); 775 Res = ParseCastExpression(false); 776 if (!Res.isInvalid()) 777 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 778 return move(Res); 779 } 780 case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression 781 // unary-expression: 'sizeof' '(' type-name ')' 782 case tok::kw_alignof: 783 case tok::kw___alignof: // unary-expression: '__alignof' unary-expression 784 // unary-expression: '__alignof' '(' type-name ')' 785 // unary-expression: 'alignof' '(' type-id ')' 786 return ParseSizeofAlignofExpression(); 787 case tok::ampamp: { // unary-expression: '&&' identifier 788 SourceLocation AmpAmpLoc = ConsumeToken(); 789 if (Tok.isNot(tok::identifier)) 790 return ExprError(Diag(Tok, diag::err_expected_ident)); 791 792 Diag(AmpAmpLoc, diag::ext_gnu_address_of_label); 793 Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), 794 Tok.getIdentifierInfo()); 795 ConsumeToken(); 796 return move(Res); 797 } 798 case tok::kw_const_cast: 799 case tok::kw_dynamic_cast: 800 case tok::kw_reinterpret_cast: 801 case tok::kw_static_cast: 802 Res = ParseCXXCasts(); 803 break; 804 case tok::kw_typeid: 805 Res = ParseCXXTypeid(); 806 break; 807 case tok::kw___uuidof: 808 Res = ParseCXXUuidof(); 809 break; 810 case tok::kw_this: 811 Res = ParseCXXThis(); 812 break; 813 814 case tok::annot_typename: 815 if (isStartOfObjCClassMessageMissingOpenBracket()) { 816 ParsedType Type = getTypeAnnotation(Tok); 817 818 // Fake up a Declarator to use with ActOnTypeName. 819 DeclSpec DS; 820 DS.SetRangeStart(Tok.getLocation()); 821 DS.SetRangeEnd(Tok.getLastLoc()); 822 823 const char *PrevSpec = 0; 824 unsigned DiagID; 825 DS.SetTypeSpecType(TST_typename, Tok.getLocation(), PrevSpec, DiagID, 826 Type); 827 828 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 829 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 830 if (Ty.isInvalid()) 831 break; 832 833 ConsumeToken(); 834 Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 835 Ty.get(), 0); 836 break; 837 } 838 // Fall through 839 840 case tok::kw_char: 841 case tok::kw_wchar_t: 842 case tok::kw_char16_t: 843 case tok::kw_char32_t: 844 case tok::kw_bool: 845 case tok::kw_short: 846 case tok::kw_int: 847 case tok::kw_long: 848 case tok::kw_signed: 849 case tok::kw_unsigned: 850 case tok::kw_float: 851 case tok::kw_double: 852 case tok::kw_void: 853 case tok::kw_typename: 854 case tok::kw_typeof: 855 case tok::kw___vector: { 856 if (!getLang().CPlusPlus) { 857 Diag(Tok, diag::err_expected_expression); 858 return ExprError(); 859 } 860 861 if (SavedKind == tok::kw_typename) { 862 // postfix-expression: typename-specifier '(' expression-list[opt] ')' 863 if (TryAnnotateTypeOrScopeToken()) 864 return ExprError(); 865 } 866 867 // postfix-expression: simple-type-specifier '(' expression-list[opt] ')' 868 // 869 DeclSpec DS; 870 ParseCXXSimpleTypeSpecifier(DS); 871 if (Tok.isNot(tok::l_paren)) 872 return ExprError(Diag(Tok, diag::err_expected_lparen_after_type) 873 << DS.getSourceRange()); 874 875 Res = ParseCXXTypeConstructExpression(DS); 876 break; 877 } 878 879 case tok::annot_cxxscope: { // [C++] id-expression: qualified-id 880 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 881 // (We can end up in this situation after tentative parsing.) 882 if (TryAnnotateTypeOrScopeToken()) 883 return ExprError(); 884 if (!Tok.is(tok::annot_cxxscope)) 885 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 886 NotCastExpr, TypeOfCast); 887 888 Token Next = NextToken(); 889 if (Next.is(tok::annot_template_id)) { 890 TemplateIdAnnotation *TemplateId 891 = static_cast<TemplateIdAnnotation *>(Next.getAnnotationValue()); 892 if (TemplateId->Kind == TNK_Type_template) { 893 // We have a qualified template-id that we know refers to a 894 // type, translate it into a type and continue parsing as a 895 // cast expression. 896 CXXScopeSpec SS; 897 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 898 AnnotateTemplateIdTokenAsType(&SS); 899 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 900 NotCastExpr, TypeOfCast); 901 } 902 } 903 904 // Parse as an id-expression. 905 Res = ParseCXXIdExpression(isAddressOfOperand); 906 break; 907 } 908 909 case tok::annot_template_id: { // [C++] template-id 910 TemplateIdAnnotation *TemplateId 911 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 912 if (TemplateId->Kind == TNK_Type_template) { 913 // We have a template-id that we know refers to a type, 914 // translate it into a type and continue parsing as a cast 915 // expression. 916 AnnotateTemplateIdTokenAsType(); 917 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 918 NotCastExpr, TypeOfCast); 919 } 920 921 // Fall through to treat the template-id as an id-expression. 922 } 923 924 case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id 925 Res = ParseCXXIdExpression(isAddressOfOperand); 926 break; 927 928 case tok::coloncolon: { 929 // ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken 930 // annotates the token, tail recurse. 931 if (TryAnnotateTypeOrScopeToken()) 932 return ExprError(); 933 if (!Tok.is(tok::coloncolon)) 934 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 935 936 // ::new -> [C++] new-expression 937 // ::delete -> [C++] delete-expression 938 SourceLocation CCLoc = ConsumeToken(); 939 if (Tok.is(tok::kw_new)) 940 return ParseCXXNewExpression(true, CCLoc); 941 if (Tok.is(tok::kw_delete)) 942 return ParseCXXDeleteExpression(true, CCLoc); 943 944 // This is not a type name or scope specifier, it is an invalid expression. 945 Diag(CCLoc, diag::err_expected_expression); 946 return ExprError(); 947 } 948 949 case tok::kw_new: // [C++] new-expression 950 return ParseCXXNewExpression(false, Tok.getLocation()); 951 952 case tok::kw_delete: // [C++] delete-expression 953 return ParseCXXDeleteExpression(false, Tok.getLocation()); 954 955 case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')' 956 SourceLocation KeyLoc = ConsumeToken(); 957 SourceLocation LParen = Tok.getLocation(); 958 if (ExpectAndConsume(tok::l_paren, 959 diag::err_expected_lparen_after, "noexcept")) 960 return ExprError(); 961 // C++ [expr.unary.noexcept]p1: 962 // The noexcept operator determines whether the evaluation of its operand, 963 // which is an unevaluated operand, can throw an exception. 964 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 965 ExprResult Result = ParseExpression(); 966 SourceLocation RParen = MatchRHSPunctuation(tok::r_paren, LParen); 967 if (!Result.isInvalid()) 968 Result = Actions.ActOnNoexceptExpr(KeyLoc, LParen, Result.take(), RParen); 969 return move(Result); 970 } 971 972 case tok::kw___is_pod: // [GNU] unary-type-trait 973 case tok::kw___is_class: 974 case tok::kw___is_enum: 975 case tok::kw___is_union: 976 case tok::kw___is_empty: 977 case tok::kw___is_polymorphic: 978 case tok::kw___is_abstract: 979 case tok::kw___is_literal: 980 case tok::kw___has_trivial_constructor: 981 case tok::kw___has_trivial_copy: 982 case tok::kw___has_trivial_assign: 983 case tok::kw___has_trivial_destructor: 984 case tok::kw___has_nothrow_assign: 985 case tok::kw___has_nothrow_copy: 986 case tok::kw___has_nothrow_constructor: 987 case tok::kw___has_virtual_destructor: 988 return ParseUnaryTypeTrait(); 989 990 case tok::at: { 991 SourceLocation AtLoc = ConsumeToken(); 992 return ParseObjCAtExpression(AtLoc); 993 } 994 case tok::caret: 995 return ParsePostfixExpressionSuffix(ParseBlockLiteralExpression()); 996 case tok::code_completion: 997 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 998 ConsumeCodeCompletionToken(); 999 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1000 NotCastExpr, TypeOfCast); 1001 case tok::l_square: 1002 // These can be followed by postfix-expr pieces. 1003 if (getLang().ObjC1) 1004 return ParsePostfixExpressionSuffix(ParseObjCMessageExpression()); 1005 // FALL THROUGH. 1006 default: 1007 NotCastExpr = true; 1008 return ExprError(); 1009 } 1010 1011 // These can be followed by postfix-expr pieces. 1012 return ParsePostfixExpressionSuffix(Res); 1013} 1014 1015/// ParsePostfixExpressionSuffix - Once the leading part of a postfix-expression 1016/// is parsed, this method parses any suffixes that apply. 1017/// 1018/// postfix-expression: [C99 6.5.2] 1019/// primary-expression 1020/// postfix-expression '[' expression ']' 1021/// postfix-expression '(' argument-expression-list[opt] ')' 1022/// postfix-expression '.' identifier 1023/// postfix-expression '->' identifier 1024/// postfix-expression '++' 1025/// postfix-expression '--' 1026/// '(' type-name ')' '{' initializer-list '}' 1027/// '(' type-name ')' '{' initializer-list ',' '}' 1028/// 1029/// argument-expression-list: [C99 6.5.2] 1030/// argument-expression 1031/// argument-expression-list ',' assignment-expression 1032/// 1033ExprResult 1034Parser::ParsePostfixExpressionSuffix(ExprResult LHS) { 1035 // Now that the primary-expression piece of the postfix-expression has been 1036 // parsed, see if there are any postfix-expression pieces here. 1037 SourceLocation Loc; 1038 while (1) { 1039 switch (Tok.getKind()) { 1040 case tok::code_completion: 1041 if (InMessageExpression) 1042 return move(LHS); 1043 1044 Actions.CodeCompletePostfixExpression(getCurScope(), LHS); 1045 ConsumeCodeCompletionToken(); 1046 LHS = ExprError(); 1047 break; 1048 1049 case tok::identifier: 1050 // If we see identifier: after an expression, and we're not already in a 1051 // message send, then this is probably a message send with a missing 1052 // opening bracket '['. 1053 if (getLang().ObjC1 && !InMessageExpression && 1054 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) { 1055 LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 1056 ParsedType(), LHS.get()); 1057 break; 1058 } 1059 1060 // Fall through; this isn't a message send. 1061 1062 default: // Not a postfix-expression suffix. 1063 return move(LHS); 1064 case tok::l_square: { // postfix-expression: p-e '[' expression ']' 1065 // If we have a array postfix expression that starts on a new line and 1066 // Objective-C is enabled, it is highly likely that the user forgot a 1067 // semicolon after the base expression and that the array postfix-expr is 1068 // actually another message send. In this case, do some look-ahead to see 1069 // if the contents of the square brackets are obviously not a valid 1070 // expression and recover by pretending there is no suffix. 1071 if (getLang().ObjC1 && Tok.isAtStartOfLine() && 1072 isSimpleObjCMessageExpression()) 1073 return move(LHS); 1074 1075 Loc = ConsumeBracket(); 1076 ExprResult Idx(ParseExpression()); 1077 1078 SourceLocation RLoc = Tok.getLocation(); 1079 1080 if (!LHS.isInvalid() && !Idx.isInvalid() && Tok.is(tok::r_square)) { 1081 LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.take(), Loc, 1082 Idx.take(), RLoc); 1083 } else 1084 LHS = ExprError(); 1085 1086 // Match the ']'. 1087 MatchRHSPunctuation(tok::r_square, Loc); 1088 break; 1089 } 1090 1091 case tok::l_paren: { // p-e: p-e '(' argument-expression-list[opt] ')' 1092 InMessageExpressionRAIIObject InMessage(*this, false); 1093 1094 ExprVector ArgExprs(Actions); 1095 CommaLocsTy CommaLocs; 1096 1097 Loc = ConsumeParen(); 1098 1099 if (Tok.is(tok::code_completion)) { 1100 Actions.CodeCompleteCall(getCurScope(), LHS.get(), 0, 0); 1101 ConsumeCodeCompletionToken(); 1102 } 1103 1104 if (Tok.isNot(tok::r_paren)) { 1105 if (ParseExpressionList(ArgExprs, CommaLocs, &Sema::CodeCompleteCall, 1106 LHS.get())) { 1107 SkipUntil(tok::r_paren); 1108 LHS = ExprError(); 1109 } 1110 } 1111 1112 // Match the ')'. 1113 if (LHS.isInvalid()) { 1114 SkipUntil(tok::r_paren); 1115 } else if (Tok.isNot(tok::r_paren)) { 1116 MatchRHSPunctuation(tok::r_paren, Loc); 1117 LHS = ExprError(); 1118 } else { 1119 assert((ArgExprs.size() == 0 || 1120 ArgExprs.size()-1 == CommaLocs.size())&& 1121 "Unexpected number of commas!"); 1122 LHS = Actions.ActOnCallExpr(getCurScope(), LHS.take(), Loc, 1123 move_arg(ArgExprs), Tok.getLocation()); 1124 ConsumeParen(); 1125 } 1126 1127 break; 1128 } 1129 case tok::arrow: 1130 case tok::period: { 1131 // postfix-expression: p-e '->' template[opt] id-expression 1132 // postfix-expression: p-e '.' template[opt] id-expression 1133 tok::TokenKind OpKind = Tok.getKind(); 1134 SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token. 1135 1136 CXXScopeSpec SS; 1137 ParsedType ObjectType; 1138 bool MayBePseudoDestructor = false; 1139 if (getLang().CPlusPlus && !LHS.isInvalid()) { 1140 LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), LHS.take(), 1141 OpLoc, OpKind, ObjectType, 1142 MayBePseudoDestructor); 1143 if (LHS.isInvalid()) 1144 break; 1145 1146 ParseOptionalCXXScopeSpecifier(SS, ObjectType, false, 1147 &MayBePseudoDestructor); 1148 if (SS.isNotEmpty()) 1149 ObjectType = ParsedType(); 1150 } 1151 1152 if (Tok.is(tok::code_completion)) { 1153 // Code completion for a member access expression. 1154 Actions.CodeCompleteMemberReferenceExpr(getCurScope(), LHS.get(), 1155 OpLoc, OpKind == tok::arrow); 1156 1157 ConsumeCodeCompletionToken(); 1158 } 1159 1160 if (MayBePseudoDestructor && !LHS.isInvalid()) { 1161 LHS = ParseCXXPseudoDestructor(LHS.take(), OpLoc, OpKind, SS, 1162 ObjectType); 1163 break; 1164 } 1165 1166 // Either the action has told is that this cannot be a 1167 // pseudo-destructor expression (based on the type of base 1168 // expression), or we didn't see a '~' in the right place. We 1169 // can still parse a destructor name here, but in that case it 1170 // names a real destructor. 1171 UnqualifiedId Name; 1172 if (ParseUnqualifiedId(SS, 1173 /*EnteringContext=*/false, 1174 /*AllowDestructorName=*/true, 1175 /*AllowConstructorName=*/false, 1176 ObjectType, 1177 Name)) 1178 LHS = ExprError(); 1179 1180 if (!LHS.isInvalid()) 1181 LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.take(), OpLoc, 1182 OpKind, SS, Name, ObjCImpDecl, 1183 Tok.is(tok::l_paren)); 1184 break; 1185 } 1186 case tok::plusplus: // postfix-expression: postfix-expression '++' 1187 case tok::minusminus: // postfix-expression: postfix-expression '--' 1188 if (!LHS.isInvalid()) { 1189 LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(), 1190 Tok.getKind(), LHS.take()); 1191 } 1192 ConsumeToken(); 1193 break; 1194 } 1195 } 1196} 1197 1198/// ParseExprAfterTypeofSizeofAlignof - We parsed a typeof/sizeof/alignof and 1199/// we are at the start of an expression or a parenthesized type-id. 1200/// OpTok is the operand token (typeof/sizeof/alignof). Returns the expression 1201/// (isCastExpr == false) or the type (isCastExpr == true). 1202/// 1203/// unary-expression: [C99 6.5.3] 1204/// 'sizeof' unary-expression 1205/// 'sizeof' '(' type-name ')' 1206/// [GNU] '__alignof' unary-expression 1207/// [GNU] '__alignof' '(' type-name ')' 1208/// [C++0x] 'alignof' '(' type-id ')' 1209/// 1210/// [GNU] typeof-specifier: 1211/// typeof ( expressions ) 1212/// typeof ( type-name ) 1213/// [GNU/C++] typeof unary-expression 1214/// 1215ExprResult 1216Parser::ParseExprAfterTypeofSizeofAlignof(const Token &OpTok, 1217 bool &isCastExpr, 1218 ParsedType &CastTy, 1219 SourceRange &CastRange) { 1220 1221 assert((OpTok.is(tok::kw_typeof) || OpTok.is(tok::kw_sizeof) || 1222 OpTok.is(tok::kw___alignof) || OpTok.is(tok::kw_alignof)) && 1223 "Not a typeof/sizeof/alignof expression!"); 1224 1225 ExprResult Operand; 1226 1227 // If the operand doesn't start with an '(', it must be an expression. 1228 if (Tok.isNot(tok::l_paren)) { 1229 isCastExpr = false; 1230 if (OpTok.is(tok::kw_typeof) && !getLang().CPlusPlus) { 1231 Diag(Tok,diag::err_expected_lparen_after_id) << OpTok.getIdentifierInfo(); 1232 return ExprError(); 1233 } 1234 1235 // C++0x [expr.sizeof]p1: 1236 // [...] The operand is either an expression, which is an unevaluated 1237 // operand (Clause 5) [...] 1238 // 1239 // The GNU typeof and alignof extensions also behave as unevaluated 1240 // operands. 1241 EnterExpressionEvaluationContext Unevaluated(Actions, 1242 Sema::Unevaluated); 1243 Operand = ParseCastExpression(true/*isUnaryExpression*/); 1244 } else { 1245 // If it starts with a '(', we know that it is either a parenthesized 1246 // type-name, or it is a unary-expression that starts with a compound 1247 // literal, or starts with a primary-expression that is a parenthesized 1248 // expression. 1249 ParenParseOption ExprType = CastExpr; 1250 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc; 1251 1252 // C++0x [expr.sizeof]p1: 1253 // [...] The operand is either an expression, which is an unevaluated 1254 // operand (Clause 5) [...] 1255 // 1256 // The GNU typeof and alignof extensions also behave as unevaluated 1257 // operands. 1258 EnterExpressionEvaluationContext Unevaluated(Actions, 1259 Sema::Unevaluated); 1260 Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/, 1261 ParsedType(), CastTy, RParenLoc); 1262 CastRange = SourceRange(LParenLoc, RParenLoc); 1263 1264 // If ParseParenExpression parsed a '(typename)' sequence only, then this is 1265 // a type. 1266 if (ExprType == CastExpr) { 1267 isCastExpr = true; 1268 return ExprEmpty(); 1269 } 1270 1271 if (getLang().CPlusPlus || OpTok.isNot(tok::kw_typeof)) { 1272 // GNU typeof in C requires the expression to be parenthesized. Not so for 1273 // sizeof/alignof or in C++. Therefore, the parenthesized expression is 1274 // the start of a unary-expression, but doesn't include any postfix 1275 // pieces. Parse these now if present. 1276 if (!Operand.isInvalid()) 1277 Operand = ParsePostfixExpressionSuffix(Operand.get()); 1278 } 1279 } 1280 1281 // If we get here, the operand to the typeof/sizeof/alignof was an expresion. 1282 isCastExpr = false; 1283 return move(Operand); 1284} 1285 1286 1287/// ParseSizeofAlignofExpression - Parse a sizeof or alignof expression. 1288/// unary-expression: [C99 6.5.3] 1289/// 'sizeof' unary-expression 1290/// 'sizeof' '(' type-name ')' 1291/// [GNU] '__alignof' unary-expression 1292/// [GNU] '__alignof' '(' type-name ')' 1293/// [C++0x] 'alignof' '(' type-id ')' 1294ExprResult Parser::ParseSizeofAlignofExpression() { 1295 assert((Tok.is(tok::kw_sizeof) || Tok.is(tok::kw___alignof) 1296 || Tok.is(tok::kw_alignof)) && 1297 "Not a sizeof/alignof expression!"); 1298 Token OpTok = Tok; 1299 ConsumeToken(); 1300 1301 bool isCastExpr; 1302 ParsedType CastTy; 1303 SourceRange CastRange; 1304 ExprResult Operand = ParseExprAfterTypeofSizeofAlignof(OpTok, 1305 isCastExpr, 1306 CastTy, 1307 CastRange); 1308 1309 if (isCastExpr) 1310 return Actions.ActOnSizeOfAlignOfExpr(OpTok.getLocation(), 1311 OpTok.is(tok::kw_sizeof), 1312 /*isType=*/true, 1313 CastTy.getAsOpaquePtr(), 1314 CastRange); 1315 1316 // If we get here, the operand to the sizeof/alignof was an expresion. 1317 if (!Operand.isInvalid()) 1318 Operand = Actions.ActOnSizeOfAlignOfExpr(OpTok.getLocation(), 1319 OpTok.is(tok::kw_sizeof), 1320 /*isType=*/false, 1321 Operand.release(), CastRange); 1322 return move(Operand); 1323} 1324 1325/// ParseBuiltinPrimaryExpression 1326/// 1327/// primary-expression: [C99 6.5.1] 1328/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 1329/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 1330/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 1331/// assign-expr ')' 1332/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 1333/// 1334/// [GNU] offsetof-member-designator: 1335/// [GNU] identifier 1336/// [GNU] offsetof-member-designator '.' identifier 1337/// [GNU] offsetof-member-designator '[' expression ']' 1338/// 1339ExprResult Parser::ParseBuiltinPrimaryExpression() { 1340 ExprResult Res; 1341 const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo(); 1342 1343 tok::TokenKind T = Tok.getKind(); 1344 SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier. 1345 1346 // All of these start with an open paren. 1347 if (Tok.isNot(tok::l_paren)) 1348 return ExprError(Diag(Tok, diag::err_expected_lparen_after_id) 1349 << BuiltinII); 1350 1351 SourceLocation LParenLoc = ConsumeParen(); 1352 // TODO: Build AST. 1353 1354 switch (T) { 1355 default: assert(0 && "Not a builtin primary expression!"); 1356 case tok::kw___builtin_va_arg: { 1357 ExprResult Expr(ParseAssignmentExpression()); 1358 1359 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1360 Expr = ExprError(); 1361 1362 TypeResult Ty = ParseTypeName(); 1363 1364 if (Tok.isNot(tok::r_paren)) { 1365 Diag(Tok, diag::err_expected_rparen); 1366 Expr = ExprError(); 1367 } 1368 1369 if (Expr.isInvalid() || Ty.isInvalid()) 1370 Res = ExprError(); 1371 else 1372 Res = Actions.ActOnVAArg(StartLoc, Expr.take(), Ty.get(), ConsumeParen()); 1373 break; 1374 } 1375 case tok::kw___builtin_offsetof: { 1376 SourceLocation TypeLoc = Tok.getLocation(); 1377 TypeResult Ty = ParseTypeName(); 1378 if (Ty.isInvalid()) { 1379 SkipUntil(tok::r_paren); 1380 return ExprError(); 1381 } 1382 1383 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1384 return ExprError(); 1385 1386 // We must have at least one identifier here. 1387 if (Tok.isNot(tok::identifier)) { 1388 Diag(Tok, diag::err_expected_ident); 1389 SkipUntil(tok::r_paren); 1390 return ExprError(); 1391 } 1392 1393 // Keep track of the various subcomponents we see. 1394 llvm::SmallVector<Sema::OffsetOfComponent, 4> Comps; 1395 1396 Comps.push_back(Sema::OffsetOfComponent()); 1397 Comps.back().isBrackets = false; 1398 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1399 Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken(); 1400 1401 // FIXME: This loop leaks the index expressions on error. 1402 while (1) { 1403 if (Tok.is(tok::period)) { 1404 // offsetof-member-designator: offsetof-member-designator '.' identifier 1405 Comps.push_back(Sema::OffsetOfComponent()); 1406 Comps.back().isBrackets = false; 1407 Comps.back().LocStart = ConsumeToken(); 1408 1409 if (Tok.isNot(tok::identifier)) { 1410 Diag(Tok, diag::err_expected_ident); 1411 SkipUntil(tok::r_paren); 1412 return ExprError(); 1413 } 1414 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1415 Comps.back().LocEnd = ConsumeToken(); 1416 1417 } else if (Tok.is(tok::l_square)) { 1418 // offsetof-member-designator: offsetof-member-design '[' expression ']' 1419 Comps.push_back(Sema::OffsetOfComponent()); 1420 Comps.back().isBrackets = true; 1421 Comps.back().LocStart = ConsumeBracket(); 1422 Res = ParseExpression(); 1423 if (Res.isInvalid()) { 1424 SkipUntil(tok::r_paren); 1425 return move(Res); 1426 } 1427 Comps.back().U.E = Res.release(); 1428 1429 Comps.back().LocEnd = 1430 MatchRHSPunctuation(tok::r_square, Comps.back().LocStart); 1431 } else { 1432 if (Tok.isNot(tok::r_paren)) { 1433 MatchRHSPunctuation(tok::r_paren, LParenLoc); 1434 Res = ExprError(); 1435 } else if (Ty.isInvalid()) { 1436 Res = ExprError(); 1437 } else { 1438 Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc, 1439 Ty.get(), &Comps[0], 1440 Comps.size(), ConsumeParen()); 1441 } 1442 break; 1443 } 1444 } 1445 break; 1446 } 1447 case tok::kw___builtin_choose_expr: { 1448 ExprResult Cond(ParseAssignmentExpression()); 1449 if (Cond.isInvalid()) { 1450 SkipUntil(tok::r_paren); 1451 return move(Cond); 1452 } 1453 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1454 return ExprError(); 1455 1456 ExprResult Expr1(ParseAssignmentExpression()); 1457 if (Expr1.isInvalid()) { 1458 SkipUntil(tok::r_paren); 1459 return move(Expr1); 1460 } 1461 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1462 return ExprError(); 1463 1464 ExprResult Expr2(ParseAssignmentExpression()); 1465 if (Expr2.isInvalid()) { 1466 SkipUntil(tok::r_paren); 1467 return move(Expr2); 1468 } 1469 if (Tok.isNot(tok::r_paren)) { 1470 Diag(Tok, diag::err_expected_rparen); 1471 return ExprError(); 1472 } 1473 Res = Actions.ActOnChooseExpr(StartLoc, Cond.take(), Expr1.take(), 1474 Expr2.take(), ConsumeParen()); 1475 break; 1476 } 1477 case tok::kw___builtin_types_compatible_p: 1478 TypeResult Ty1 = ParseTypeName(); 1479 1480 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1481 return ExprError(); 1482 1483 TypeResult Ty2 = ParseTypeName(); 1484 1485 if (Tok.isNot(tok::r_paren)) { 1486 Diag(Tok, diag::err_expected_rparen); 1487 return ExprError(); 1488 } 1489 1490 if (Ty1.isInvalid() || Ty2.isInvalid()) 1491 Res = ExprError(); 1492 else 1493 Res = Actions.ActOnTypesCompatibleExpr(StartLoc, Ty1.get(), Ty2.get(), 1494 ConsumeParen()); 1495 break; 1496 } 1497 1498 if (Res.isInvalid()) 1499 return ExprError(); 1500 1501 // These can be followed by postfix-expr pieces because they are 1502 // primary-expressions. 1503 return ParsePostfixExpressionSuffix(Res.take()); 1504} 1505 1506/// ParseParenExpression - This parses the unit that starts with a '(' token, 1507/// based on what is allowed by ExprType. The actual thing parsed is returned 1508/// in ExprType. If stopIfCastExpr is true, it will only return the parsed type, 1509/// not the parsed cast-expression. 1510/// 1511/// primary-expression: [C99 6.5.1] 1512/// '(' expression ')' 1513/// [GNU] '(' compound-statement ')' (if !ParenExprOnly) 1514/// postfix-expression: [C99 6.5.2] 1515/// '(' type-name ')' '{' initializer-list '}' 1516/// '(' type-name ')' '{' initializer-list ',' '}' 1517/// cast-expression: [C99 6.5.4] 1518/// '(' type-name ')' cast-expression 1519/// 1520ExprResult 1521Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr, 1522 ParsedType TypeOfCast, ParsedType &CastTy, 1523 SourceLocation &RParenLoc) { 1524 assert(Tok.is(tok::l_paren) && "Not a paren expr!"); 1525 GreaterThanIsOperatorScope G(GreaterThanIsOperator, true); 1526 SourceLocation OpenLoc = ConsumeParen(); 1527 ExprResult Result(true); 1528 bool isAmbiguousTypeId; 1529 CastTy = ParsedType(); 1530 1531 if (Tok.is(tok::code_completion)) { 1532 Actions.CodeCompleteOrdinaryName(getCurScope(), 1533 ExprType >= CompoundLiteral? Sema::PCC_ParenthesizedExpression 1534 : Sema::PCC_Expression); 1535 ConsumeCodeCompletionToken(); 1536 return ExprError(); 1537 } 1538 1539 if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) { 1540 Diag(Tok, diag::ext_gnu_statement_expr); 1541 StmtResult Stmt(ParseCompoundStatement(0, true)); 1542 ExprType = CompoundStmt; 1543 1544 // If the substmt parsed correctly, build the AST node. 1545 if (!Stmt.isInvalid() && Tok.is(tok::r_paren)) 1546 Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.take(), Tok.getLocation()); 1547 1548 } else if (ExprType >= CompoundLiteral && 1549 isTypeIdInParens(isAmbiguousTypeId)) { 1550 1551 // Otherwise, this is a compound literal expression or cast expression. 1552 1553 // In C++, if the type-id is ambiguous we disambiguate based on context. 1554 // If stopIfCastExpr is true the context is a typeof/sizeof/alignof 1555 // in which case we should treat it as type-id. 1556 // if stopIfCastExpr is false, we need to determine the context past the 1557 // parens, so we defer to ParseCXXAmbiguousParenExpression for that. 1558 if (isAmbiguousTypeId && !stopIfCastExpr) 1559 return ParseCXXAmbiguousParenExpression(ExprType, CastTy, 1560 OpenLoc, RParenLoc); 1561 1562 TypeResult Ty; 1563 1564 { 1565 InMessageExpressionRAIIObject InMessage(*this, false); 1566 Ty = ParseTypeName(); 1567 } 1568 1569 // If our type is followed by an identifier and either ':' or ']', then 1570 // this is probably an Objective-C message send where the leading '[' is 1571 // missing. Recover as if that were the case. 1572 if (!Ty.isInvalid() && Tok.is(tok::identifier) && !InMessageExpression && 1573 getLang().ObjC1 && !Ty.get().get().isNull() && 1574 (NextToken().is(tok::colon) || NextToken().is(tok::r_square)) && 1575 Ty.get().get()->isObjCObjectOrInterfaceType()) { 1576 Result = ParseObjCMessageExpressionBody(SourceLocation(), 1577 SourceLocation(), 1578 Ty.get(), 0); 1579 } else { 1580 // Match the ')'. 1581 if (Tok.is(tok::r_paren)) 1582 RParenLoc = ConsumeParen(); 1583 else 1584 MatchRHSPunctuation(tok::r_paren, OpenLoc); 1585 1586 if (Tok.is(tok::l_brace)) { 1587 ExprType = CompoundLiteral; 1588 return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc); 1589 } 1590 1591 if (ExprType == CastExpr) { 1592 // We parsed '(' type-name ')' and the thing after it wasn't a '{'. 1593 1594 if (Ty.isInvalid()) 1595 return ExprError(); 1596 1597 CastTy = Ty.get(); 1598 1599 // Note that this doesn't parse the subsequent cast-expression, it just 1600 // returns the parsed type to the callee. 1601 if (stopIfCastExpr) 1602 return ExprResult(); 1603 1604 // Reject the cast of super idiom in ObjC. 1605 if (Tok.is(tok::identifier) && getLang().ObjC1 && 1606 Tok.getIdentifierInfo() == Ident_super && 1607 getCurScope()->isInObjcMethodScope() && 1608 GetLookAheadToken(1).isNot(tok::period)) { 1609 Diag(Tok.getLocation(), diag::err_illegal_super_cast) 1610 << SourceRange(OpenLoc, RParenLoc); 1611 return ExprError(); 1612 } 1613 1614 // Parse the cast-expression that follows it next. 1615 // TODO: For cast expression with CastTy. 1616 Result = ParseCastExpression(false, false, CastTy); 1617 if (!Result.isInvalid()) 1618 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc, CastTy, 1619 RParenLoc, Result.take()); 1620 return move(Result); 1621 } 1622 1623 Diag(Tok, diag::err_expected_lbrace_in_compound_literal); 1624 return ExprError(); 1625 } 1626 } else if (TypeOfCast) { 1627 // Parse the expression-list. 1628 InMessageExpressionRAIIObject InMessage(*this, false); 1629 1630 ExprVector ArgExprs(Actions); 1631 CommaLocsTy CommaLocs; 1632 1633 if (!ParseExpressionList(ArgExprs, CommaLocs)) { 1634 ExprType = SimpleExpr; 1635 Result = Actions.ActOnParenOrParenListExpr(OpenLoc, Tok.getLocation(), 1636 move_arg(ArgExprs), TypeOfCast); 1637 } 1638 } else { 1639 InMessageExpressionRAIIObject InMessage(*this, false); 1640 1641 Result = ParseExpression(); 1642 ExprType = SimpleExpr; 1643 if (!Result.isInvalid() && Tok.is(tok::r_paren)) 1644 Result = Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.take()); 1645 } 1646 1647 // Match the ')'. 1648 if (Result.isInvalid()) { 1649 SkipUntil(tok::r_paren); 1650 return ExprError(); 1651 } 1652 1653 if (Tok.is(tok::r_paren)) 1654 RParenLoc = ConsumeParen(); 1655 else 1656 MatchRHSPunctuation(tok::r_paren, OpenLoc); 1657 1658 return move(Result); 1659} 1660 1661/// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name 1662/// and we are at the left brace. 1663/// 1664/// postfix-expression: [C99 6.5.2] 1665/// '(' type-name ')' '{' initializer-list '}' 1666/// '(' type-name ')' '{' initializer-list ',' '}' 1667/// 1668ExprResult 1669Parser::ParseCompoundLiteralExpression(ParsedType Ty, 1670 SourceLocation LParenLoc, 1671 SourceLocation RParenLoc) { 1672 assert(Tok.is(tok::l_brace) && "Not a compound literal!"); 1673 if (!getLang().C99) // Compound literals don't exist in C90. 1674 Diag(LParenLoc, diag::ext_c99_compound_literal); 1675 ExprResult Result = ParseInitializer(); 1676 if (!Result.isInvalid() && Ty) 1677 return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.take()); 1678 return move(Result); 1679} 1680 1681/// ParseStringLiteralExpression - This handles the various token types that 1682/// form string literals, and also handles string concatenation [C99 5.1.1.2, 1683/// translation phase #6]. 1684/// 1685/// primary-expression: [C99 6.5.1] 1686/// string-literal 1687ExprResult Parser::ParseStringLiteralExpression() { 1688 assert(isTokenStringLiteral() && "Not a string literal!"); 1689 1690 // String concat. Note that keywords like __func__ and __FUNCTION__ are not 1691 // considered to be strings for concatenation purposes. 1692 llvm::SmallVector<Token, 4> StringToks; 1693 1694 do { 1695 StringToks.push_back(Tok); 1696 ConsumeStringToken(); 1697 } while (isTokenStringLiteral()); 1698 1699 // Pass the set of string tokens, ready for concatenation, to the actions. 1700 return Actions.ActOnStringLiteral(&StringToks[0], StringToks.size()); 1701} 1702 1703/// ParseExpressionList - Used for C/C++ (argument-)expression-list. 1704/// 1705/// argument-expression-list: 1706/// assignment-expression 1707/// argument-expression-list , assignment-expression 1708/// 1709/// [C++] expression-list: 1710/// [C++] assignment-expression 1711/// [C++] expression-list , assignment-expression 1712/// 1713bool Parser::ParseExpressionList(llvm::SmallVectorImpl<Expr*> &Exprs, 1714 llvm::SmallVectorImpl<SourceLocation> &CommaLocs, 1715 void (Sema::*Completer)(Scope *S, 1716 Expr *Data, 1717 Expr **Args, 1718 unsigned NumArgs), 1719 Expr *Data) { 1720 while (1) { 1721 if (Tok.is(tok::code_completion)) { 1722 if (Completer) 1723 (Actions.*Completer)(getCurScope(), Data, Exprs.data(), Exprs.size()); 1724 ConsumeCodeCompletionToken(); 1725 } 1726 1727 ExprResult Expr(ParseAssignmentExpression()); 1728 if (Expr.isInvalid()) 1729 return true; 1730 1731 Exprs.push_back(Expr.release()); 1732 1733 if (Tok.isNot(tok::comma)) 1734 return false; 1735 // Move to the next argument, remember where the comma was. 1736 CommaLocs.push_back(ConsumeToken()); 1737 } 1738} 1739 1740/// ParseBlockId - Parse a block-id, which roughly looks like int (int x). 1741/// 1742/// [clang] block-id: 1743/// [clang] specifier-qualifier-list block-declarator 1744/// 1745void Parser::ParseBlockId() { 1746 // Parse the specifier-qualifier-list piece. 1747 DeclSpec DS; 1748 ParseSpecifierQualifierList(DS); 1749 1750 // Parse the block-declarator. 1751 Declarator DeclaratorInfo(DS, Declarator::BlockLiteralContext); 1752 ParseDeclarator(DeclaratorInfo); 1753 1754 // We do this for: ^ __attribute__((noreturn)) {, as DS has the attributes. 1755 DeclaratorInfo.AddAttributes(DS.TakeAttributes(), 1756 SourceLocation()); 1757 1758 if (Tok.is(tok::kw___attribute)) { 1759 SourceLocation Loc; 1760 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1761 DeclaratorInfo.AddAttributes(AttrList, Loc); 1762 } 1763 1764 // Inform sema that we are starting a block. 1765 Actions.ActOnBlockArguments(DeclaratorInfo, getCurScope()); 1766} 1767 1768/// ParseBlockLiteralExpression - Parse a block literal, which roughly looks 1769/// like ^(int x){ return x+1; } 1770/// 1771/// block-literal: 1772/// [clang] '^' block-args[opt] compound-statement 1773/// [clang] '^' block-id compound-statement 1774/// [clang] block-args: 1775/// [clang] '(' parameter-list ')' 1776/// 1777ExprResult Parser::ParseBlockLiteralExpression() { 1778 assert(Tok.is(tok::caret) && "block literal starts with ^"); 1779 SourceLocation CaretLoc = ConsumeToken(); 1780 1781 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc, 1782 "block literal parsing"); 1783 1784 // Enter a scope to hold everything within the block. This includes the 1785 // argument decls, decls within the compound expression, etc. This also 1786 // allows determining whether a variable reference inside the block is 1787 // within or outside of the block. 1788 ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope | 1789 Scope::BreakScope | Scope::ContinueScope | 1790 Scope::DeclScope); 1791 1792 // Inform sema that we are starting a block. 1793 Actions.ActOnBlockStart(CaretLoc, getCurScope()); 1794 1795 // Parse the return type if present. 1796 DeclSpec DS; 1797 Declarator ParamInfo(DS, Declarator::BlockLiteralContext); 1798 // FIXME: Since the return type isn't actually parsed, it can't be used to 1799 // fill ParamInfo with an initial valid range, so do it manually. 1800 ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation())); 1801 1802 // If this block has arguments, parse them. There is no ambiguity here with 1803 // the expression case, because the expression case requires a parameter list. 1804 if (Tok.is(tok::l_paren)) { 1805 ParseParenDeclarator(ParamInfo); 1806 // Parse the pieces after the identifier as if we had "int(...)". 1807 // SetIdentifier sets the source range end, but in this case we're past 1808 // that location. 1809 SourceLocation Tmp = ParamInfo.getSourceRange().getEnd(); 1810 ParamInfo.SetIdentifier(0, CaretLoc); 1811 ParamInfo.SetRangeEnd(Tmp); 1812 if (ParamInfo.isInvalidType()) { 1813 // If there was an error parsing the arguments, they may have 1814 // tried to use ^(x+y) which requires an argument list. Just 1815 // skip the whole block literal. 1816 Actions.ActOnBlockError(CaretLoc, getCurScope()); 1817 return ExprError(); 1818 } 1819 1820 if (Tok.is(tok::kw___attribute)) { 1821 SourceLocation Loc; 1822 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1823 ParamInfo.AddAttributes(AttrList, Loc); 1824 } 1825 1826 // Inform sema that we are starting a block. 1827 Actions.ActOnBlockArguments(ParamInfo, getCurScope()); 1828 } else if (!Tok.is(tok::l_brace)) { 1829 ParseBlockId(); 1830 } else { 1831 // Otherwise, pretend we saw (void). 1832 ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(true, false, 1833 SourceLocation(), 1834 0, 0, 0, 1835 false, SourceLocation(), 1836 false, 0, 0, 0, 1837 CaretLoc, CaretLoc, 1838 ParamInfo), 1839 CaretLoc); 1840 1841 if (Tok.is(tok::kw___attribute)) { 1842 SourceLocation Loc; 1843 AttributeList *AttrList = ParseGNUAttributes(&Loc); 1844 ParamInfo.AddAttributes(AttrList, Loc); 1845 } 1846 1847 // Inform sema that we are starting a block. 1848 Actions.ActOnBlockArguments(ParamInfo, getCurScope()); 1849 } 1850 1851 1852 ExprResult Result(true); 1853 if (!Tok.is(tok::l_brace)) { 1854 // Saw something like: ^expr 1855 Diag(Tok, diag::err_expected_expression); 1856 Actions.ActOnBlockError(CaretLoc, getCurScope()); 1857 return ExprError(); 1858 } 1859 1860 StmtResult Stmt(ParseCompoundStatementBody()); 1861 if (!Stmt.isInvalid()) 1862 Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.take(), getCurScope()); 1863 else 1864 Actions.ActOnBlockError(CaretLoc, getCurScope()); 1865 return move(Result); 1866} 1867