ParseExpr.cpp revision 312eadb832cab4497a069409954500d8192b8f0d
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 ...[opt] 176/// expression ',' assignment-expression ...[opt] 177/// 178/// \param Primary if non-empty, an already-parsed expression that will be used 179/// as the first primary expression. 180ExprResult Parser::ParseExpression(ExprResult Primary) { 181 ExprResult LHS(ParseAssignmentExpression(Primary)); 182 return ParseRHSOfBinaryExpression(move(LHS), prec::Comma); 183} 184 185/// This routine is called when the '@' is seen and consumed. 186/// Current token is an Identifier and is not a 'try'. This 187/// routine is necessary to disambiguate @try-statement from, 188/// for example, @encode-expression. 189/// 190ExprResult 191Parser::ParseExpressionWithLeadingAt(SourceLocation AtLoc) { 192 ExprResult LHS(ParseObjCAtExpression(AtLoc)); 193 return ParseRHSOfBinaryExpression(move(LHS), prec::Comma); 194} 195 196/// This routine is called when a leading '__extension__' is seen and 197/// consumed. This is necessary because the token gets consumed in the 198/// process of disambiguating between an expression and a declaration. 199ExprResult 200Parser::ParseExpressionWithLeadingExtension(SourceLocation ExtLoc) { 201 ExprResult LHS(true); 202 { 203 // Silence extension warnings in the sub-expression 204 ExtensionRAIIObject O(Diags); 205 206 LHS = ParseCastExpression(false); 207 } 208 209 if (!LHS.isInvalid()) 210 LHS = Actions.ActOnUnaryOp(getCurScope(), ExtLoc, tok::kw___extension__, 211 LHS.take()); 212 213 return ParseRHSOfBinaryExpression(move(LHS), prec::Comma); 214} 215 216/// ParseAssignmentExpression - Parse an expr that doesn't include commas. 217/// 218/// \param Primary if non-empty, an already-parsed expression that will be used 219/// as the first primary expression. 220ExprResult Parser::ParseAssignmentExpression(ExprResult Primary) { 221 if (Tok.is(tok::code_completion)) { 222 if (Primary.isUsable()) 223 Actions.CodeCompletePostfixExpression(getCurScope(), Primary); 224 else 225 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 226 ConsumeCodeCompletionToken(); 227 } 228 229 if (!Primary.isUsable() && Tok.is(tok::kw_throw)) 230 return ParseThrowExpression(); 231 232 ExprResult LHS; 233 if (Primary.get() || Primary.isInvalid()) 234 LHS = ParsePostfixExpressionSuffix(Primary); 235 else 236 LHS = ParseCastExpression(false, false, ParsedType()); 237 238 return ParseRHSOfBinaryExpression(move(LHS), prec::Assignment); 239} 240 241/// ParseAssignmentExprWithObjCMessageExprStart - Parse an assignment expression 242/// where part of an objc message send has already been parsed. In this case 243/// LBracLoc indicates the location of the '[' of the message send, and either 244/// ReceiverName or ReceiverExpr is non-null indicating the receiver of the 245/// message. 246/// 247/// Since this handles full assignment-expression's, it handles postfix 248/// expressions and other binary operators for these expressions as well. 249ExprResult 250Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc, 251 SourceLocation SuperLoc, 252 ParsedType ReceiverType, 253 Expr *ReceiverExpr) { 254 ExprResult R 255 = ParseObjCMessageExpressionBody(LBracLoc, SuperLoc, 256 ReceiverType, ReceiverExpr); 257 R = ParsePostfixExpressionSuffix(R); 258 return ParseRHSOfBinaryExpression(R, prec::Assignment); 259} 260 261 262ExprResult Parser::ParseConstantExpression() { 263 // C++ [basic.def.odr]p2: 264 // An expression is potentially evaluated unless it appears where an 265 // integral constant expression is required (see 5.19) [...]. 266 EnterExpressionEvaluationContext Unevaluated(Actions, 267 Sema::Unevaluated); 268 269 ExprResult LHS(ParseCastExpression(false)); 270 return ParseRHSOfBinaryExpression(LHS, prec::Conditional); 271} 272 273/// ParseRHSOfBinaryExpression - Parse a binary expression that starts with 274/// LHS and has a precedence of at least MinPrec. 275ExprResult 276Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) { 277 prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(), 278 GreaterThanIsOperator, 279 getLang().CPlusPlus0x); 280 SourceLocation ColonLoc; 281 282 while (1) { 283 // If this token has a lower precedence than we are allowed to parse (e.g. 284 // because we are called recursively, or because the token is not a binop), 285 // then we are done! 286 if (NextTokPrec < MinPrec) 287 return move(LHS); 288 289 // Consume the operator, saving the operator token for error reporting. 290 Token OpToken = Tok; 291 ConsumeToken(); 292 293 // Special case handling for the ternary operator. 294 ExprResult TernaryMiddle(true); 295 if (NextTokPrec == prec::Conditional) { 296 if (Tok.isNot(tok::colon)) { 297 // Don't parse FOO:BAR as if it were a typo for FOO::BAR. 298 ColonProtectionRAIIObject X(*this); 299 300 // Handle this production specially: 301 // logical-OR-expression '?' expression ':' conditional-expression 302 // In particular, the RHS of the '?' is 'expression', not 303 // 'logical-OR-expression' as we might expect. 304 TernaryMiddle = ParseExpression(); 305 if (TernaryMiddle.isInvalid()) { 306 LHS = ExprError(); 307 TernaryMiddle = 0; 308 } 309 } else { 310 // Special case handling of "X ? Y : Z" where Y is empty: 311 // logical-OR-expression '?' ':' conditional-expression [GNU] 312 TernaryMiddle = 0; 313 Diag(Tok, diag::ext_gnu_conditional_expr); 314 } 315 316 if (Tok.is(tok::colon)) { 317 // Eat the colon. 318 ColonLoc = ConsumeToken(); 319 } else { 320 // Otherwise, we're missing a ':'. Assume that this was a typo that the 321 // user forgot. If we're not in a macro instantion, we can suggest a 322 // fixit hint. If there were two spaces before the current token, 323 // suggest inserting the colon in between them, otherwise insert ": ". 324 SourceLocation FILoc = Tok.getLocation(); 325 const char *FIText = ": "; 326 if (FILoc.isFileID()) { 327 const SourceManager &SM = PP.getSourceManager(); 328 bool IsInvalid = false; 329 const char *SourcePtr = 330 SM.getCharacterData(FILoc.getFileLocWithOffset(-1), &IsInvalid); 331 if (!IsInvalid && *SourcePtr == ' ') { 332 SourcePtr = 333 SM.getCharacterData(FILoc.getFileLocWithOffset(-2), &IsInvalid); 334 if (!IsInvalid && *SourcePtr == ' ') { 335 FILoc = FILoc.getFileLocWithOffset(-1); 336 FIText = ":"; 337 } 338 } 339 } 340 341 Diag(Tok, diag::err_expected_colon) 342 << FixItHint::CreateInsertion(FILoc, FIText); 343 Diag(OpToken, diag::note_matching) << "?"; 344 ColonLoc = Tok.getLocation(); 345 } 346 } 347 348 // Code completion for the right-hand side of an assignment expression 349 // goes through a special hook that takes the left-hand side into account. 350 if (Tok.is(tok::code_completion) && NextTokPrec == prec::Assignment) { 351 Actions.CodeCompleteAssignmentRHS(getCurScope(), LHS.get()); 352 ConsumeCodeCompletionToken(); 353 return ExprError(); 354 } 355 356 // Parse another leaf here for the RHS of the operator. 357 // ParseCastExpression works here because all RHS expressions in C have it 358 // as a prefix, at least. However, in C++, an assignment-expression could 359 // be a throw-expression, which is not a valid cast-expression. 360 // Therefore we need some special-casing here. 361 // Also note that the third operand of the conditional operator is 362 // an assignment-expression in C++. 363 ExprResult RHS; 364 if (getLang().CPlusPlus && NextTokPrec <= prec::Conditional) 365 RHS = ParseAssignmentExpression(); 366 else 367 RHS = ParseCastExpression(false); 368 369 if (RHS.isInvalid()) 370 LHS = ExprError(); 371 372 // Remember the precedence of this operator and get the precedence of the 373 // operator immediately to the right of the RHS. 374 prec::Level ThisPrec = NextTokPrec; 375 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 376 getLang().CPlusPlus0x); 377 378 // Assignment and conditional expressions are right-associative. 379 bool isRightAssoc = ThisPrec == prec::Conditional || 380 ThisPrec == prec::Assignment; 381 382 // Get the precedence of the operator to the right of the RHS. If it binds 383 // more tightly with RHS than we do, evaluate it completely first. 384 if (ThisPrec < NextTokPrec || 385 (ThisPrec == NextTokPrec && isRightAssoc)) { 386 // If this is left-associative, only parse things on the RHS that bind 387 // more tightly than the current operator. If it is left-associative, it 388 // is okay, to bind exactly as tightly. For example, compile A=B=C=D as 389 // A=(B=(C=D)), where each paren is a level of recursion here. 390 // The function takes ownership of the RHS. 391 RHS = ParseRHSOfBinaryExpression(RHS, 392 static_cast<prec::Level>(ThisPrec + !isRightAssoc)); 393 394 if (RHS.isInvalid()) 395 LHS = ExprError(); 396 397 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator, 398 getLang().CPlusPlus0x); 399 } 400 assert(NextTokPrec <= ThisPrec && "Recursion didn't work!"); 401 402 if (!LHS.isInvalid()) { 403 // Combine the LHS and RHS into the LHS (e.g. build AST). 404 if (TernaryMiddle.isInvalid()) { 405 // If we're using '>>' as an operator within a template 406 // argument list (in C++98), suggest the addition of 407 // parentheses so that the code remains well-formed in C++0x. 408 if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater)) 409 SuggestParentheses(OpToken.getLocation(), 410 diag::warn_cxx0x_right_shift_in_template_arg, 411 SourceRange(Actions.getExprRange(LHS.get()).getBegin(), 412 Actions.getExprRange(RHS.get()).getEnd())); 413 414 LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(), 415 OpToken.getKind(), LHS.take(), RHS.take()); 416 } else 417 LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc, 418 LHS.take(), TernaryMiddle.take(), 419 RHS.take()); 420 } 421 } 422} 423 424/// ParseCastExpression - Parse a cast-expression, or, if isUnaryExpression is 425/// true, parse a unary-expression. isAddressOfOperand exists because an 426/// id-expression that is the operand of address-of gets special treatment 427/// due to member pointers. 428/// 429ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 430 bool isAddressOfOperand, 431 ParsedType TypeOfCast) { 432 bool NotCastExpr; 433 ExprResult Res = ParseCastExpression(isUnaryExpression, 434 isAddressOfOperand, 435 NotCastExpr, 436 TypeOfCast); 437 if (NotCastExpr) 438 Diag(Tok, diag::err_expected_expression); 439 return move(Res); 440} 441 442/// ParseCastExpression - Parse a cast-expression, or, if isUnaryExpression is 443/// true, parse a unary-expression. isAddressOfOperand exists because an 444/// id-expression that is the operand of address-of gets special treatment 445/// due to member pointers. NotCastExpr is set to true if the token is not the 446/// start of a cast-expression, and no diagnostic is emitted in this case. 447/// 448/// cast-expression: [C99 6.5.4] 449/// unary-expression 450/// '(' type-name ')' cast-expression 451/// 452/// unary-expression: [C99 6.5.3] 453/// postfix-expression 454/// '++' unary-expression 455/// '--' unary-expression 456/// unary-operator cast-expression 457/// 'sizeof' unary-expression 458/// 'sizeof' '(' type-name ')' 459/// [C++0x] 'sizeof' '...' '(' identifier ')' 460/// [GNU] '__alignof' unary-expression 461/// [GNU] '__alignof' '(' type-name ')' 462/// [C++0x] 'alignof' '(' type-id ')' 463/// [GNU] '&&' identifier 464/// [C++] new-expression 465/// [C++] delete-expression 466/// [C++0x] 'noexcept' '(' expression ')' 467/// 468/// unary-operator: one of 469/// '&' '*' '+' '-' '~' '!' 470/// [GNU] '__extension__' '__real' '__imag' 471/// 472/// primary-expression: [C99 6.5.1] 473/// [C99] identifier 474/// [C++] id-expression 475/// constant 476/// string-literal 477/// [C++] boolean-literal [C++ 2.13.5] 478/// [C++0x] 'nullptr' [C++0x 2.14.7] 479/// '(' expression ')' 480/// [C1X] generic-selection 481/// '__func__' [C99 6.4.2.2] 482/// [GNU] '__FUNCTION__' 483/// [GNU] '__PRETTY_FUNCTION__' 484/// [GNU] '(' compound-statement ')' 485/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 486/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 487/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 488/// assign-expr ')' 489/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 490/// [GNU] '__null' 491/// [OBJC] '[' objc-message-expr ']' 492/// [OBJC] '@selector' '(' objc-selector-arg ')' 493/// [OBJC] '@protocol' '(' identifier ')' 494/// [OBJC] '@encode' '(' type-name ')' 495/// [OBJC] objc-string-literal 496/// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 497/// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3] 498/// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 499/// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 500/// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 501/// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1] 502/// [C++] 'typeid' '(' expression ')' [C++ 5.2p1] 503/// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1] 504/// [C++] 'this' [C++ 9.3.2] 505/// [G++] unary-type-trait '(' type-id ')' 506/// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO] 507/// [clang] '^' block-literal 508/// 509/// constant: [C99 6.4.4] 510/// integer-constant 511/// floating-constant 512/// enumeration-constant -> identifier 513/// character-constant 514/// 515/// id-expression: [C++ 5.1] 516/// unqualified-id 517/// qualified-id 518/// 519/// unqualified-id: [C++ 5.1] 520/// identifier 521/// operator-function-id 522/// conversion-function-id 523/// '~' class-name 524/// template-id 525/// 526/// new-expression: [C++ 5.3.4] 527/// '::'[opt] 'new' new-placement[opt] new-type-id 528/// new-initializer[opt] 529/// '::'[opt] 'new' new-placement[opt] '(' type-id ')' 530/// new-initializer[opt] 531/// 532/// delete-expression: [C++ 5.3.5] 533/// '::'[opt] 'delete' cast-expression 534/// '::'[opt] 'delete' '[' ']' cast-expression 535/// 536/// [GNU] unary-type-trait: 537/// '__has_nothrow_assign' 538/// '__has_nothrow_copy' 539/// '__has_nothrow_constructor' 540/// '__has_trivial_assign' [TODO] 541/// '__has_trivial_copy' [TODO] 542/// '__has_trivial_constructor' 543/// '__has_trivial_destructor' 544/// '__has_virtual_destructor' 545/// '__is_abstract' [TODO] 546/// '__is_class' 547/// '__is_empty' [TODO] 548/// '__is_enum' 549/// '__is_pod' 550/// '__is_polymorphic' 551/// '__is_trivial' 552/// '__is_union' 553/// 554/// binary-type-trait: 555/// [GNU] '__is_base_of' 556/// [MS] '__is_convertible_to' 557/// 558ExprResult Parser::ParseCastExpression(bool isUnaryExpression, 559 bool isAddressOfOperand, 560 bool &NotCastExpr, 561 ParsedType TypeOfCast) { 562 ExprResult Res; 563 tok::TokenKind SavedKind = Tok.getKind(); 564 NotCastExpr = false; 565 566 // This handles all of cast-expression, unary-expression, postfix-expression, 567 // and primary-expression. We handle them together like this for efficiency 568 // and to simplify handling of an expression starting with a '(' token: which 569 // may be one of a parenthesized expression, cast-expression, compound literal 570 // expression, or statement expression. 571 // 572 // If the parsed tokens consist of a primary-expression, the cases below 573 // break out of the switch; at the end we call ParsePostfixExpressionSuffix 574 // to handle the postfix expression suffixes. Cases that cannot be followed 575 // by postfix exprs should return without invoking 576 // ParsePostfixExpressionSuffix. 577 switch (SavedKind) { 578 case tok::l_paren: { 579 // If this expression is limited to being a unary-expression, the parent can 580 // not start a cast expression. 581 ParenParseOption ParenExprType = 582 (isUnaryExpression && !getLang().CPlusPlus)? CompoundLiteral : CastExpr; 583 ParsedType CastTy; 584 SourceLocation RParenLoc; 585 586 { 587 // The inside of the parens don't need to be a colon protected scope, and 588 // isn't immediately a message send. 589 ColonProtectionRAIIObject X(*this, false); 590 591 Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/, 592 TypeOfCast, CastTy, RParenLoc); 593 } 594 595 switch (ParenExprType) { 596 case SimpleExpr: break; // Nothing else to do. 597 case CompoundStmt: break; // Nothing else to do. 598 case CompoundLiteral: 599 // We parsed '(' type-name ')' '{' ... '}'. If any suffixes of 600 // postfix-expression exist, parse them now. 601 break; 602 case CastExpr: 603 // We have parsed the cast-expression and no postfix-expr pieces are 604 // following. 605 return move(Res); 606 } 607 608 break; 609 } 610 611 // primary-expression 612 case tok::numeric_constant: 613 // constant: integer-constant 614 // constant: floating-constant 615 616 Res = Actions.ActOnNumericConstant(Tok); 617 ConsumeToken(); 618 break; 619 620 case tok::kw_true: 621 case tok::kw_false: 622 return ParseCXXBoolLiteral(); 623 624 case tok::kw_nullptr: 625 return Actions.ActOnCXXNullPtrLiteral(ConsumeToken()); 626 627 case tok::identifier: { // primary-expression: identifier 628 // unqualified-id: identifier 629 // constant: enumeration-constant 630 // Turn a potentially qualified name into a annot_typename or 631 // annot_cxxscope if it would be valid. This handles things like x::y, etc. 632 if (getLang().CPlusPlus) { 633 // Avoid the unnecessary parse-time lookup in the common case 634 // where the syntax forbids a type. 635 const Token &Next = NextToken(); 636 if (Next.is(tok::coloncolon) || 637 (!ColonIsSacred && Next.is(tok::colon)) || 638 Next.is(tok::less) || 639 Next.is(tok::l_paren)) { 640 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 641 if (TryAnnotateTypeOrScopeToken()) 642 return ExprError(); 643 if (!Tok.is(tok::identifier)) 644 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 645 } 646 } 647 648 // Consume the identifier so that we can see if it is followed by a '(' or 649 // '.'. 650 IdentifierInfo &II = *Tok.getIdentifierInfo(); 651 SourceLocation ILoc = ConsumeToken(); 652 653 // Support 'Class.property' and 'super.property' notation. 654 if (getLang().ObjC1 && Tok.is(tok::period) && 655 (Actions.getTypeName(II, ILoc, getCurScope()) || 656 // Allow the base to be 'super' if in an objc-method. 657 (&II == Ident_super && getCurScope()->isInObjcMethodScope()))) { 658 ConsumeToken(); 659 660 if (Tok.isNot(tok::identifier)) { 661 Diag(Tok, diag::err_expected_property_name); 662 return ExprError(); 663 } 664 IdentifierInfo &PropertyName = *Tok.getIdentifierInfo(); 665 SourceLocation PropertyLoc = ConsumeToken(); 666 667 Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName, 668 ILoc, PropertyLoc); 669 break; 670 } 671 672 // In an Objective-C method, if we have "super" followed by an identifier, 673 // the token sequence is ill-formed. However, if there's a ':' or ']' after 674 // that identifier, this is probably a message send with a missing open 675 // bracket. Treat it as such. 676 if (getLang().ObjC1 && &II == Ident_super && !InMessageExpression && 677 getCurScope()->isInObjcMethodScope() && 678 ((Tok.is(tok::identifier) && 679 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) || 680 Tok.is(tok::code_completion))) { 681 Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, ParsedType(), 682 0); 683 break; 684 } 685 686 // If we have an Objective-C class name followed by an identifier 687 // and either ':' or ']', this is an Objective-C class message 688 // send that's missing the opening '['. Recovery 689 // appropriately. Also take this path if we're performing code 690 // completion after an Objective-C class name. 691 if (getLang().ObjC1 && 692 ((Tok.is(tok::identifier) && !InMessageExpression) || 693 Tok.is(tok::code_completion))) { 694 const Token& Next = NextToken(); 695 if (Tok.is(tok::code_completion) || 696 Next.is(tok::colon) || Next.is(tok::r_square)) 697 if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope())) 698 if (Typ.get()->isObjCObjectOrInterfaceType()) { 699 // Fake up a Declarator to use with ActOnTypeName. 700 DeclSpec DS(AttrFactory); 701 DS.SetRangeStart(ILoc); 702 DS.SetRangeEnd(ILoc); 703 const char *PrevSpec = 0; 704 unsigned DiagID; 705 DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ); 706 707 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 708 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), 709 DeclaratorInfo); 710 if (Ty.isInvalid()) 711 break; 712 713 Res = ParseObjCMessageExpressionBody(SourceLocation(), 714 SourceLocation(), 715 Ty.get(), 0); 716 break; 717 } 718 } 719 720 // Make sure to pass down the right value for isAddressOfOperand. 721 if (isAddressOfOperand && isPostfixExpressionSuffixStart()) 722 isAddressOfOperand = false; 723 724 // Function designators are allowed to be undeclared (C99 6.5.1p2), so we 725 // need to know whether or not this identifier is a function designator or 726 // not. 727 UnqualifiedId Name; 728 CXXScopeSpec ScopeSpec; 729 Name.setIdentifier(&II, ILoc); 730 Res = Actions.ActOnIdExpression(getCurScope(), ScopeSpec, Name, 731 Tok.is(tok::l_paren), isAddressOfOperand); 732 break; 733 } 734 case tok::char_constant: // constant: character-constant 735 Res = Actions.ActOnCharacterConstant(Tok); 736 ConsumeToken(); 737 break; 738 case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2] 739 case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU] 740 case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU] 741 Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind); 742 ConsumeToken(); 743 break; 744 case tok::string_literal: // primary-expression: string-literal 745 case tok::wide_string_literal: 746 Res = ParseStringLiteralExpression(); 747 break; 748 case tok::kw__Generic: // primary-expression: generic-selection [C1X 6.5.1] 749 Res = ParseGenericSelectionExpression(); 750 break; 751 case tok::kw___builtin_va_arg: 752 case tok::kw___builtin_offsetof: 753 case tok::kw___builtin_choose_expr: 754 return ParseBuiltinPrimaryExpression(); 755 case tok::kw___null: 756 return Actions.ActOnGNUNullExpr(ConsumeToken()); 757 break; 758 case tok::plusplus: // unary-expression: '++' unary-expression [C99] 759 case tok::minusminus: { // unary-expression: '--' unary-expression [C99] 760 // C++ [expr.unary] has: 761 // unary-expression: 762 // ++ cast-expression 763 // -- cast-expression 764 SourceLocation SavedLoc = ConsumeToken(); 765 Res = ParseCastExpression(!getLang().CPlusPlus); 766 if (!Res.isInvalid()) 767 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 768 return move(Res); 769 } 770 case tok::amp: { // unary-expression: '&' cast-expression 771 // Special treatment because of member pointers 772 SourceLocation SavedLoc = ConsumeToken(); 773 Res = ParseCastExpression(false, true); 774 if (!Res.isInvalid()) 775 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 776 return move(Res); 777 } 778 779 case tok::star: // unary-expression: '*' cast-expression 780 case tok::plus: // unary-expression: '+' cast-expression 781 case tok::minus: // unary-expression: '-' cast-expression 782 case tok::tilde: // unary-expression: '~' cast-expression 783 case tok::exclaim: // unary-expression: '!' cast-expression 784 case tok::kw___real: // unary-expression: '__real' cast-expression [GNU] 785 case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU] 786 SourceLocation SavedLoc = ConsumeToken(); 787 Res = ParseCastExpression(false); 788 if (!Res.isInvalid()) 789 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 790 return move(Res); 791 } 792 793 case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU] 794 // __extension__ silences extension warnings in the subexpression. 795 ExtensionRAIIObject O(Diags); // Use RAII to do this. 796 SourceLocation SavedLoc = ConsumeToken(); 797 Res = ParseCastExpression(false); 798 if (!Res.isInvalid()) 799 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get()); 800 return move(Res); 801 } 802 case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression 803 // unary-expression: 'sizeof' '(' type-name ')' 804 case tok::kw_alignof: 805 case tok::kw___alignof: // unary-expression: '__alignof' unary-expression 806 // unary-expression: '__alignof' '(' type-name ')' 807 // unary-expression: 'alignof' '(' type-id ')' 808 case tok::kw_vec_step: // unary-expression: OpenCL 'vec_step' expression 809 return ParseUnaryExprOrTypeTraitExpression(); 810 case tok::ampamp: { // unary-expression: '&&' identifier 811 SourceLocation AmpAmpLoc = ConsumeToken(); 812 if (Tok.isNot(tok::identifier)) 813 return ExprError(Diag(Tok, diag::err_expected_ident)); 814 815 if (getCurScope()->getFnParent() == 0) 816 return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn)); 817 818 Diag(AmpAmpLoc, diag::ext_gnu_address_of_label); 819 LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(), 820 Tok.getLocation()); 821 Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD); 822 ConsumeToken(); 823 return move(Res); 824 } 825 case tok::kw_const_cast: 826 case tok::kw_dynamic_cast: 827 case tok::kw_reinterpret_cast: 828 case tok::kw_static_cast: 829 Res = ParseCXXCasts(); 830 break; 831 case tok::kw_typeid: 832 Res = ParseCXXTypeid(); 833 break; 834 case tok::kw___uuidof: 835 Res = ParseCXXUuidof(); 836 break; 837 case tok::kw_this: 838 Res = ParseCXXThis(); 839 break; 840 841 case tok::annot_typename: 842 if (isStartOfObjCClassMessageMissingOpenBracket()) { 843 ParsedType Type = getTypeAnnotation(Tok); 844 845 // Fake up a Declarator to use with ActOnTypeName. 846 DeclSpec DS(AttrFactory); 847 DS.SetRangeStart(Tok.getLocation()); 848 DS.SetRangeEnd(Tok.getLastLoc()); 849 850 const char *PrevSpec = 0; 851 unsigned DiagID; 852 DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(), 853 PrevSpec, DiagID, Type); 854 855 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext); 856 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo); 857 if (Ty.isInvalid()) 858 break; 859 860 ConsumeToken(); 861 Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 862 Ty.get(), 0); 863 break; 864 } 865 // Fall through 866 867 case tok::kw_char: 868 case tok::kw_wchar_t: 869 case tok::kw_char16_t: 870 case tok::kw_char32_t: 871 case tok::kw_bool: 872 case tok::kw_short: 873 case tok::kw_int: 874 case tok::kw_long: 875 case tok::kw_signed: 876 case tok::kw_unsigned: 877 case tok::kw_float: 878 case tok::kw_double: 879 case tok::kw_void: 880 case tok::kw_typename: 881 case tok::kw_typeof: 882 case tok::kw___vector: { 883 if (!getLang().CPlusPlus) { 884 Diag(Tok, diag::err_expected_expression); 885 return ExprError(); 886 } 887 888 if (SavedKind == tok::kw_typename) { 889 // postfix-expression: typename-specifier '(' expression-list[opt] ')' 890 if (TryAnnotateTypeOrScopeToken()) 891 return ExprError(); 892 } 893 894 // postfix-expression: simple-type-specifier '(' expression-list[opt] ')' 895 // 896 DeclSpec DS(AttrFactory); 897 ParseCXXSimpleTypeSpecifier(DS); 898 if (Tok.isNot(tok::l_paren)) 899 return ExprError(Diag(Tok, diag::err_expected_lparen_after_type) 900 << DS.getSourceRange()); 901 902 Res = ParseCXXTypeConstructExpression(DS); 903 break; 904 } 905 906 case tok::annot_cxxscope: { // [C++] id-expression: qualified-id 907 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse. 908 // (We can end up in this situation after tentative parsing.) 909 if (TryAnnotateTypeOrScopeToken()) 910 return ExprError(); 911 if (!Tok.is(tok::annot_cxxscope)) 912 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 913 NotCastExpr, TypeOfCast); 914 915 Token Next = NextToken(); 916 if (Next.is(tok::annot_template_id)) { 917 TemplateIdAnnotation *TemplateId 918 = static_cast<TemplateIdAnnotation *>(Next.getAnnotationValue()); 919 if (TemplateId->Kind == TNK_Type_template) { 920 // We have a qualified template-id that we know refers to a 921 // type, translate it into a type and continue parsing as a 922 // cast expression. 923 CXXScopeSpec SS; 924 ParseOptionalCXXScopeSpecifier(SS, ParsedType(), false); 925 AnnotateTemplateIdTokenAsType(); 926 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 927 NotCastExpr, TypeOfCast); 928 } 929 } 930 931 // Parse as an id-expression. 932 Res = ParseCXXIdExpression(isAddressOfOperand); 933 break; 934 } 935 936 case tok::annot_template_id: { // [C++] template-id 937 TemplateIdAnnotation *TemplateId 938 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue()); 939 if (TemplateId->Kind == TNK_Type_template) { 940 // We have a template-id that we know refers to a type, 941 // translate it into a type and continue parsing as a cast 942 // expression. 943 AnnotateTemplateIdTokenAsType(); 944 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 945 NotCastExpr, TypeOfCast); 946 } 947 948 // Fall through to treat the template-id as an id-expression. 949 } 950 951 case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id 952 Res = ParseCXXIdExpression(isAddressOfOperand); 953 break; 954 955 case tok::coloncolon: { 956 // ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken 957 // annotates the token, tail recurse. 958 if (TryAnnotateTypeOrScopeToken()) 959 return ExprError(); 960 if (!Tok.is(tok::coloncolon)) 961 return ParseCastExpression(isUnaryExpression, isAddressOfOperand); 962 963 // ::new -> [C++] new-expression 964 // ::delete -> [C++] delete-expression 965 SourceLocation CCLoc = ConsumeToken(); 966 if (Tok.is(tok::kw_new)) 967 return ParseCXXNewExpression(true, CCLoc); 968 if (Tok.is(tok::kw_delete)) 969 return ParseCXXDeleteExpression(true, CCLoc); 970 971 // This is not a type name or scope specifier, it is an invalid expression. 972 Diag(CCLoc, diag::err_expected_expression); 973 return ExprError(); 974 } 975 976 case tok::kw_new: // [C++] new-expression 977 return ParseCXXNewExpression(false, Tok.getLocation()); 978 979 case tok::kw_delete: // [C++] delete-expression 980 return ParseCXXDeleteExpression(false, Tok.getLocation()); 981 982 case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')' 983 SourceLocation KeyLoc = ConsumeToken(); 984 SourceLocation LParen = Tok.getLocation(); 985 if (ExpectAndConsume(tok::l_paren, 986 diag::err_expected_lparen_after, "noexcept")) 987 return ExprError(); 988 // C++ [expr.unary.noexcept]p1: 989 // The noexcept operator determines whether the evaluation of its operand, 990 // which is an unevaluated operand, can throw an exception. 991 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 992 ExprResult Result = ParseExpression(); 993 SourceLocation RParen = MatchRHSPunctuation(tok::r_paren, LParen); 994 if (!Result.isInvalid()) 995 Result = Actions.ActOnNoexceptExpr(KeyLoc, LParen, Result.take(), RParen); 996 return move(Result); 997 } 998 999 case tok::kw___is_abstract: // [GNU] unary-type-trait 1000 case tok::kw___is_class: 1001 case tok::kw___is_empty: 1002 case tok::kw___is_enum: 1003 case tok::kw___is_literal: 1004 case tok::kw___is_literal_type: 1005 case tok::kw___is_pod: 1006 case tok::kw___is_polymorphic: 1007 case tok::kw___is_trivial: 1008 case tok::kw___is_union: 1009 case tok::kw___has_trivial_constructor: 1010 case tok::kw___has_trivial_copy: 1011 case tok::kw___has_trivial_assign: 1012 case tok::kw___has_trivial_destructor: 1013 case tok::kw___has_nothrow_assign: 1014 case tok::kw___has_nothrow_copy: 1015 case tok::kw___has_nothrow_constructor: 1016 case tok::kw___has_virtual_destructor: 1017 return ParseUnaryTypeTrait(); 1018 1019 case tok::kw___builtin_types_compatible_p: 1020 case tok::kw___is_base_of: 1021 case tok::kw___is_convertible_to: 1022 return ParseBinaryTypeTrait(); 1023 1024 case tok::at: { 1025 SourceLocation AtLoc = ConsumeToken(); 1026 return ParseObjCAtExpression(AtLoc); 1027 } 1028 case tok::caret: 1029 return ParsePostfixExpressionSuffix(ParseBlockLiteralExpression()); 1030 case tok::code_completion: 1031 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 1032 ConsumeCodeCompletionToken(); 1033 return ParseCastExpression(isUnaryExpression, isAddressOfOperand, 1034 NotCastExpr, TypeOfCast); 1035 case tok::l_square: 1036 // These can be followed by postfix-expr pieces. 1037 if (getLang().ObjC1) 1038 return ParsePostfixExpressionSuffix(ParseObjCMessageExpression()); 1039 // FALL THROUGH. 1040 default: 1041 NotCastExpr = true; 1042 return ExprError(); 1043 } 1044 1045 // These can be followed by postfix-expr pieces. 1046 return ParsePostfixExpressionSuffix(Res); 1047} 1048 1049/// ParsePostfixExpressionSuffix - Once the leading part of a postfix-expression 1050/// is parsed, this method parses any suffixes that apply. 1051/// 1052/// postfix-expression: [C99 6.5.2] 1053/// primary-expression 1054/// postfix-expression '[' expression ']' 1055/// postfix-expression '(' argument-expression-list[opt] ')' 1056/// postfix-expression '.' identifier 1057/// postfix-expression '->' identifier 1058/// postfix-expression '++' 1059/// postfix-expression '--' 1060/// '(' type-name ')' '{' initializer-list '}' 1061/// '(' type-name ')' '{' initializer-list ',' '}' 1062/// 1063/// argument-expression-list: [C99 6.5.2] 1064/// argument-expression ...[opt] 1065/// argument-expression-list ',' assignment-expression ...[opt] 1066/// 1067ExprResult 1068Parser::ParsePostfixExpressionSuffix(ExprResult LHS) { 1069 // Now that the primary-expression piece of the postfix-expression has been 1070 // parsed, see if there are any postfix-expression pieces here. 1071 SourceLocation Loc; 1072 while (1) { 1073 switch (Tok.getKind()) { 1074 case tok::code_completion: 1075 if (InMessageExpression) 1076 return move(LHS); 1077 1078 Actions.CodeCompletePostfixExpression(getCurScope(), LHS); 1079 ConsumeCodeCompletionToken(); 1080 LHS = ExprError(); 1081 break; 1082 1083 case tok::identifier: 1084 // If we see identifier: after an expression, and we're not already in a 1085 // message send, then this is probably a message send with a missing 1086 // opening bracket '['. 1087 if (getLang().ObjC1 && !InMessageExpression && 1088 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) { 1089 LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(), 1090 ParsedType(), LHS.get()); 1091 break; 1092 } 1093 1094 // Fall through; this isn't a message send. 1095 1096 default: // Not a postfix-expression suffix. 1097 return move(LHS); 1098 case tok::l_square: { // postfix-expression: p-e '[' expression ']' 1099 // If we have a array postfix expression that starts on a new line and 1100 // Objective-C is enabled, it is highly likely that the user forgot a 1101 // semicolon after the base expression and that the array postfix-expr is 1102 // actually another message send. In this case, do some look-ahead to see 1103 // if the contents of the square brackets are obviously not a valid 1104 // expression and recover by pretending there is no suffix. 1105 if (getLang().ObjC1 && Tok.isAtStartOfLine() && 1106 isSimpleObjCMessageExpression()) 1107 return move(LHS); 1108 1109 Loc = ConsumeBracket(); 1110 ExprResult Idx(ParseExpression()); 1111 1112 SourceLocation RLoc = Tok.getLocation(); 1113 1114 if (!LHS.isInvalid() && !Idx.isInvalid() && Tok.is(tok::r_square)) { 1115 LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.take(), Loc, 1116 Idx.take(), RLoc); 1117 } else 1118 LHS = ExprError(); 1119 1120 // Match the ']'. 1121 MatchRHSPunctuation(tok::r_square, Loc); 1122 break; 1123 } 1124 1125 case tok::l_paren: // p-e: p-e '(' argument-expression-list[opt] ')' 1126 case tok::lesslessless: { // p-e: p-e '<<<' argument-expression-list '>>>' 1127 // '(' argument-expression-list[opt] ')' 1128 tok::TokenKind OpKind = Tok.getKind(); 1129 InMessageExpressionRAIIObject InMessage(*this, false); 1130 1131 Expr *ExecConfig = 0; 1132 1133 if (OpKind == tok::lesslessless) { 1134 ExprVector ExecConfigExprs(Actions); 1135 CommaLocsTy ExecConfigCommaLocs; 1136 SourceLocation LLLLoc, GGGLoc; 1137 1138 LLLLoc = ConsumeToken(); 1139 1140 if (ParseExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) { 1141 LHS = ExprError(); 1142 } 1143 1144 if (LHS.isInvalid()) { 1145 SkipUntil(tok::greatergreatergreater); 1146 } else if (Tok.isNot(tok::greatergreatergreater)) { 1147 MatchRHSPunctuation(tok::greatergreatergreater, LLLLoc); 1148 LHS = ExprError(); 1149 } else { 1150 GGGLoc = ConsumeToken(); 1151 } 1152 1153 if (!LHS.isInvalid()) { 1154 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen, "")) 1155 LHS = ExprError(); 1156 else 1157 Loc = PrevTokLocation; 1158 } 1159 1160 if (!LHS.isInvalid()) { 1161 ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(), 1162 LLLLoc, move_arg(ExecConfigExprs), GGGLoc); 1163 if (ECResult.isInvalid()) 1164 LHS = ExprError(); 1165 else 1166 ExecConfig = ECResult.get(); 1167 } 1168 } else { 1169 Loc = ConsumeParen(); 1170 } 1171 1172 ExprVector ArgExprs(Actions); 1173 CommaLocsTy CommaLocs; 1174 1175 if (Tok.is(tok::code_completion)) { 1176 Actions.CodeCompleteCall(getCurScope(), LHS.get(), 0, 0); 1177 ConsumeCodeCompletionToken(); 1178 } 1179 1180 if (OpKind == tok::l_paren || !LHS.isInvalid()) { 1181 if (Tok.isNot(tok::r_paren)) { 1182 if (ParseExpressionList(ArgExprs, CommaLocs, &Sema::CodeCompleteCall, 1183 LHS.get())) { 1184 SkipUntil(tok::r_paren); 1185 LHS = ExprError(); 1186 } 1187 } 1188 } 1189 1190 // Match the ')'. 1191 if (LHS.isInvalid()) { 1192 SkipUntil(tok::r_paren); 1193 } else if (Tok.isNot(tok::r_paren)) { 1194 MatchRHSPunctuation(tok::r_paren, Loc); 1195 LHS = ExprError(); 1196 } else { 1197 assert((ArgExprs.size() == 0 || 1198 ArgExprs.size()-1 == CommaLocs.size())&& 1199 "Unexpected number of commas!"); 1200 LHS = Actions.ActOnCallExpr(getCurScope(), LHS.take(), Loc, 1201 move_arg(ArgExprs), Tok.getLocation(), 1202 ExecConfig); 1203 ConsumeParen(); 1204 } 1205 1206 break; 1207 } 1208 case tok::arrow: 1209 case tok::period: { 1210 // postfix-expression: p-e '->' template[opt] id-expression 1211 // postfix-expression: p-e '.' template[opt] id-expression 1212 tok::TokenKind OpKind = Tok.getKind(); 1213 SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token. 1214 1215 CXXScopeSpec SS; 1216 ParsedType ObjectType; 1217 bool MayBePseudoDestructor = false; 1218 if (getLang().CPlusPlus && !LHS.isInvalid()) { 1219 LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), LHS.take(), 1220 OpLoc, OpKind, ObjectType, 1221 MayBePseudoDestructor); 1222 if (LHS.isInvalid()) 1223 break; 1224 1225 ParseOptionalCXXScopeSpecifier(SS, ObjectType, false, 1226 &MayBePseudoDestructor); 1227 if (SS.isNotEmpty()) 1228 ObjectType = ParsedType(); 1229 } 1230 1231 if (Tok.is(tok::code_completion)) { 1232 // Code completion for a member access expression. 1233 Actions.CodeCompleteMemberReferenceExpr(getCurScope(), LHS.get(), 1234 OpLoc, OpKind == tok::arrow); 1235 1236 ConsumeCodeCompletionToken(); 1237 } 1238 1239 if (MayBePseudoDestructor && !LHS.isInvalid()) { 1240 LHS = ParseCXXPseudoDestructor(LHS.take(), OpLoc, OpKind, SS, 1241 ObjectType); 1242 break; 1243 } 1244 1245 // Either the action has told is that this cannot be a 1246 // pseudo-destructor expression (based on the type of base 1247 // expression), or we didn't see a '~' in the right place. We 1248 // can still parse a destructor name here, but in that case it 1249 // names a real destructor. 1250 // Allow explicit constructor calls in Microsoft mode. 1251 // FIXME: Add support for explicit call of template constructor. 1252 UnqualifiedId Name; 1253 if (ParseUnqualifiedId(SS, 1254 /*EnteringContext=*/false, 1255 /*AllowDestructorName=*/true, 1256 /*AllowConstructorName=*/ getLang().Microsoft, 1257 ObjectType, 1258 Name)) 1259 LHS = ExprError(); 1260 1261 if (!LHS.isInvalid()) 1262 LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.take(), OpLoc, 1263 OpKind, SS, Name, ObjCImpDecl, 1264 Tok.is(tok::l_paren)); 1265 break; 1266 } 1267 case tok::plusplus: // postfix-expression: postfix-expression '++' 1268 case tok::minusminus: // postfix-expression: postfix-expression '--' 1269 if (!LHS.isInvalid()) { 1270 LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(), 1271 Tok.getKind(), LHS.take()); 1272 } 1273 ConsumeToken(); 1274 break; 1275 } 1276 } 1277} 1278 1279/// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/ 1280/// vec_step and we are at the start of an expression or a parenthesized 1281/// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the 1282/// expression (isCastExpr == false) or the type (isCastExpr == true). 1283/// 1284/// unary-expression: [C99 6.5.3] 1285/// 'sizeof' unary-expression 1286/// 'sizeof' '(' type-name ')' 1287/// [GNU] '__alignof' unary-expression 1288/// [GNU] '__alignof' '(' type-name ')' 1289/// [C++0x] 'alignof' '(' type-id ')' 1290/// 1291/// [GNU] typeof-specifier: 1292/// typeof ( expressions ) 1293/// typeof ( type-name ) 1294/// [GNU/C++] typeof unary-expression 1295/// 1296/// [OpenCL 1.1 6.11.12] vec_step built-in function: 1297/// vec_step ( expressions ) 1298/// vec_step ( type-name ) 1299/// 1300ExprResult 1301Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok, 1302 bool &isCastExpr, 1303 ParsedType &CastTy, 1304 SourceRange &CastRange) { 1305 1306 assert((OpTok.is(tok::kw_typeof) || OpTok.is(tok::kw_sizeof) || 1307 OpTok.is(tok::kw___alignof) || OpTok.is(tok::kw_alignof) || 1308 OpTok.is(tok::kw_vec_step)) && 1309 "Not a typeof/sizeof/alignof/vec_step expression!"); 1310 1311 ExprResult Operand; 1312 1313 // If the operand doesn't start with an '(', it must be an expression. 1314 if (Tok.isNot(tok::l_paren)) { 1315 isCastExpr = false; 1316 if (OpTok.is(tok::kw_typeof) && !getLang().CPlusPlus) { 1317 Diag(Tok,diag::err_expected_lparen_after_id) << OpTok.getIdentifierInfo(); 1318 return ExprError(); 1319 } 1320 1321 // C++0x [expr.sizeof]p1: 1322 // [...] The operand is either an expression, which is an unevaluated 1323 // operand (Clause 5) [...] 1324 // 1325 // The GNU typeof and alignof extensions also behave as unevaluated 1326 // operands. 1327 EnterExpressionEvaluationContext Unevaluated(Actions, 1328 Sema::Unevaluated); 1329 Operand = ParseCastExpression(true/*isUnaryExpression*/); 1330 } else { 1331 // If it starts with a '(', we know that it is either a parenthesized 1332 // type-name, or it is a unary-expression that starts with a compound 1333 // literal, or starts with a primary-expression that is a parenthesized 1334 // expression. 1335 ParenParseOption ExprType = CastExpr; 1336 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc; 1337 1338 // C++0x [expr.sizeof]p1: 1339 // [...] The operand is either an expression, which is an unevaluated 1340 // operand (Clause 5) [...] 1341 // 1342 // The GNU typeof and alignof extensions also behave as unevaluated 1343 // operands. 1344 EnterExpressionEvaluationContext Unevaluated(Actions, 1345 Sema::Unevaluated); 1346 Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/, 1347 ParsedType(), CastTy, RParenLoc); 1348 CastRange = SourceRange(LParenLoc, RParenLoc); 1349 1350 // If ParseParenExpression parsed a '(typename)' sequence only, then this is 1351 // a type. 1352 if (ExprType == CastExpr) { 1353 isCastExpr = true; 1354 return ExprEmpty(); 1355 } 1356 1357 if (getLang().CPlusPlus || OpTok.isNot(tok::kw_typeof)) { 1358 // GNU typeof in C requires the expression to be parenthesized. Not so for 1359 // sizeof/alignof or in C++. Therefore, the parenthesized expression is 1360 // the start of a unary-expression, but doesn't include any postfix 1361 // pieces. Parse these now if present. 1362 if (!Operand.isInvalid()) 1363 Operand = ParsePostfixExpressionSuffix(Operand.get()); 1364 } 1365 } 1366 1367 // If we get here, the operand to the typeof/sizeof/alignof was an expresion. 1368 isCastExpr = false; 1369 return move(Operand); 1370} 1371 1372 1373/// ParseUnaryExprOrTypeTraitExpression - Parse a sizeof or alignof expression. 1374/// unary-expression: [C99 6.5.3] 1375/// 'sizeof' unary-expression 1376/// 'sizeof' '(' type-name ')' 1377/// [C++0x] 'sizeof' '...' '(' identifier ')' 1378/// [GNU] '__alignof' unary-expression 1379/// [GNU] '__alignof' '(' type-name ')' 1380/// [C++0x] 'alignof' '(' type-id ')' 1381ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() { 1382 assert((Tok.is(tok::kw_sizeof) || Tok.is(tok::kw___alignof) 1383 || Tok.is(tok::kw_alignof) || Tok.is(tok::kw_vec_step)) && 1384 "Not a sizeof/alignof/vec_step expression!"); 1385 Token OpTok = Tok; 1386 ConsumeToken(); 1387 1388 // [C++0x] 'sizeof' '...' '(' identifier ')' 1389 if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) { 1390 SourceLocation EllipsisLoc = ConsumeToken(); 1391 SourceLocation LParenLoc, RParenLoc; 1392 IdentifierInfo *Name = 0; 1393 SourceLocation NameLoc; 1394 if (Tok.is(tok::l_paren)) { 1395 LParenLoc = ConsumeParen(); 1396 if (Tok.is(tok::identifier)) { 1397 Name = Tok.getIdentifierInfo(); 1398 NameLoc = ConsumeToken(); 1399 RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1400 if (RParenLoc.isInvalid()) 1401 RParenLoc = PP.getLocForEndOfToken(NameLoc); 1402 } else { 1403 Diag(Tok, diag::err_expected_parameter_pack); 1404 SkipUntil(tok::r_paren); 1405 } 1406 } else if (Tok.is(tok::identifier)) { 1407 Name = Tok.getIdentifierInfo(); 1408 NameLoc = ConsumeToken(); 1409 LParenLoc = PP.getLocForEndOfToken(EllipsisLoc); 1410 RParenLoc = PP.getLocForEndOfToken(NameLoc); 1411 Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack) 1412 << Name 1413 << FixItHint::CreateInsertion(LParenLoc, "(") 1414 << FixItHint::CreateInsertion(RParenLoc, ")"); 1415 } else { 1416 Diag(Tok, diag::err_sizeof_parameter_pack); 1417 } 1418 1419 if (!Name) 1420 return ExprError(); 1421 1422 return Actions.ActOnSizeofParameterPackExpr(getCurScope(), 1423 OpTok.getLocation(), 1424 *Name, NameLoc, 1425 RParenLoc); 1426 } 1427 1428 bool isCastExpr; 1429 ParsedType CastTy; 1430 SourceRange CastRange; 1431 ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok, 1432 isCastExpr, 1433 CastTy, 1434 CastRange); 1435 1436 UnaryExprOrTypeTrait ExprKind = UETT_SizeOf; 1437 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw___alignof)) 1438 ExprKind = UETT_AlignOf; 1439 else if (OpTok.is(tok::kw_vec_step)) 1440 ExprKind = UETT_VecStep; 1441 1442 if (isCastExpr) 1443 return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(), 1444 ExprKind, 1445 /*isType=*/true, 1446 CastTy.getAsOpaquePtr(), 1447 CastRange); 1448 1449 // If we get here, the operand to the sizeof/alignof was an expresion. 1450 if (!Operand.isInvalid()) 1451 Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(), 1452 ExprKind, 1453 /*isType=*/false, 1454 Operand.release(), 1455 CastRange); 1456 return move(Operand); 1457} 1458 1459/// ParseBuiltinPrimaryExpression 1460/// 1461/// primary-expression: [C99 6.5.1] 1462/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')' 1463/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')' 1464/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ',' 1465/// assign-expr ')' 1466/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')' 1467/// 1468/// [GNU] offsetof-member-designator: 1469/// [GNU] identifier 1470/// [GNU] offsetof-member-designator '.' identifier 1471/// [GNU] offsetof-member-designator '[' expression ']' 1472/// 1473ExprResult Parser::ParseBuiltinPrimaryExpression() { 1474 ExprResult Res; 1475 const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo(); 1476 1477 tok::TokenKind T = Tok.getKind(); 1478 SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier. 1479 1480 // All of these start with an open paren. 1481 if (Tok.isNot(tok::l_paren)) 1482 return ExprError(Diag(Tok, diag::err_expected_lparen_after_id) 1483 << BuiltinII); 1484 1485 SourceLocation LParenLoc = ConsumeParen(); 1486 // TODO: Build AST. 1487 1488 switch (T) { 1489 default: assert(0 && "Not a builtin primary expression!"); 1490 case tok::kw___builtin_va_arg: { 1491 ExprResult Expr(ParseAssignmentExpression()); 1492 1493 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1494 Expr = ExprError(); 1495 1496 TypeResult Ty = ParseTypeName(); 1497 1498 if (Tok.isNot(tok::r_paren)) { 1499 Diag(Tok, diag::err_expected_rparen); 1500 Expr = ExprError(); 1501 } 1502 1503 if (Expr.isInvalid() || Ty.isInvalid()) 1504 Res = ExprError(); 1505 else 1506 Res = Actions.ActOnVAArg(StartLoc, Expr.take(), Ty.get(), ConsumeParen()); 1507 break; 1508 } 1509 case tok::kw___builtin_offsetof: { 1510 SourceLocation TypeLoc = Tok.getLocation(); 1511 TypeResult Ty = ParseTypeName(); 1512 if (Ty.isInvalid()) { 1513 SkipUntil(tok::r_paren); 1514 return ExprError(); 1515 } 1516 1517 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1518 return ExprError(); 1519 1520 // We must have at least one identifier here. 1521 if (Tok.isNot(tok::identifier)) { 1522 Diag(Tok, diag::err_expected_ident); 1523 SkipUntil(tok::r_paren); 1524 return ExprError(); 1525 } 1526 1527 // Keep track of the various subcomponents we see. 1528 llvm::SmallVector<Sema::OffsetOfComponent, 4> Comps; 1529 1530 Comps.push_back(Sema::OffsetOfComponent()); 1531 Comps.back().isBrackets = false; 1532 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1533 Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken(); 1534 1535 // FIXME: This loop leaks the index expressions on error. 1536 while (1) { 1537 if (Tok.is(tok::period)) { 1538 // offsetof-member-designator: offsetof-member-designator '.' identifier 1539 Comps.push_back(Sema::OffsetOfComponent()); 1540 Comps.back().isBrackets = false; 1541 Comps.back().LocStart = ConsumeToken(); 1542 1543 if (Tok.isNot(tok::identifier)) { 1544 Diag(Tok, diag::err_expected_ident); 1545 SkipUntil(tok::r_paren); 1546 return ExprError(); 1547 } 1548 Comps.back().U.IdentInfo = Tok.getIdentifierInfo(); 1549 Comps.back().LocEnd = ConsumeToken(); 1550 1551 } else if (Tok.is(tok::l_square)) { 1552 // offsetof-member-designator: offsetof-member-design '[' expression ']' 1553 Comps.push_back(Sema::OffsetOfComponent()); 1554 Comps.back().isBrackets = true; 1555 Comps.back().LocStart = ConsumeBracket(); 1556 Res = ParseExpression(); 1557 if (Res.isInvalid()) { 1558 SkipUntil(tok::r_paren); 1559 return move(Res); 1560 } 1561 Comps.back().U.E = Res.release(); 1562 1563 Comps.back().LocEnd = 1564 MatchRHSPunctuation(tok::r_square, Comps.back().LocStart); 1565 } else { 1566 if (Tok.isNot(tok::r_paren)) { 1567 MatchRHSPunctuation(tok::r_paren, LParenLoc); 1568 Res = ExprError(); 1569 } else if (Ty.isInvalid()) { 1570 Res = ExprError(); 1571 } else { 1572 Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc, 1573 Ty.get(), &Comps[0], 1574 Comps.size(), ConsumeParen()); 1575 } 1576 break; 1577 } 1578 } 1579 break; 1580 } 1581 case tok::kw___builtin_choose_expr: { 1582 ExprResult Cond(ParseAssignmentExpression()); 1583 if (Cond.isInvalid()) { 1584 SkipUntil(tok::r_paren); 1585 return move(Cond); 1586 } 1587 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1588 return ExprError(); 1589 1590 ExprResult Expr1(ParseAssignmentExpression()); 1591 if (Expr1.isInvalid()) { 1592 SkipUntil(tok::r_paren); 1593 return move(Expr1); 1594 } 1595 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren)) 1596 return ExprError(); 1597 1598 ExprResult Expr2(ParseAssignmentExpression()); 1599 if (Expr2.isInvalid()) { 1600 SkipUntil(tok::r_paren); 1601 return move(Expr2); 1602 } 1603 if (Tok.isNot(tok::r_paren)) { 1604 Diag(Tok, diag::err_expected_rparen); 1605 return ExprError(); 1606 } 1607 Res = Actions.ActOnChooseExpr(StartLoc, Cond.take(), Expr1.take(), 1608 Expr2.take(), ConsumeParen()); 1609 break; 1610 } 1611 } 1612 1613 if (Res.isInvalid()) 1614 return ExprError(); 1615 1616 // These can be followed by postfix-expr pieces because they are 1617 // primary-expressions. 1618 return ParsePostfixExpressionSuffix(Res.take()); 1619} 1620 1621/// ParseParenExpression - This parses the unit that starts with a '(' token, 1622/// based on what is allowed by ExprType. The actual thing parsed is returned 1623/// in ExprType. If stopIfCastExpr is true, it will only return the parsed type, 1624/// not the parsed cast-expression. 1625/// 1626/// primary-expression: [C99 6.5.1] 1627/// '(' expression ')' 1628/// [GNU] '(' compound-statement ')' (if !ParenExprOnly) 1629/// postfix-expression: [C99 6.5.2] 1630/// '(' type-name ')' '{' initializer-list '}' 1631/// '(' type-name ')' '{' initializer-list ',' '}' 1632/// cast-expression: [C99 6.5.4] 1633/// '(' type-name ')' cast-expression 1634/// 1635ExprResult 1636Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr, 1637 ParsedType TypeOfCast, ParsedType &CastTy, 1638 SourceLocation &RParenLoc) { 1639 assert(Tok.is(tok::l_paren) && "Not a paren expr!"); 1640 GreaterThanIsOperatorScope G(GreaterThanIsOperator, true); 1641 SourceLocation OpenLoc = ConsumeParen(); 1642 ExprResult Result(true); 1643 bool isAmbiguousTypeId; 1644 CastTy = ParsedType(); 1645 1646 if (Tok.is(tok::code_completion)) { 1647 Actions.CodeCompleteOrdinaryName(getCurScope(), 1648 ExprType >= CompoundLiteral? Sema::PCC_ParenthesizedExpression 1649 : Sema::PCC_Expression); 1650 ConsumeCodeCompletionToken(); 1651 return ExprError(); 1652 } 1653 1654 // None of these cases should fall through with an invalid Result 1655 // unless they've already reported an error. 1656 1657 if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) { 1658 Diag(Tok, diag::ext_gnu_statement_expr); 1659 ParsedAttributes attrs(AttrFactory); 1660 StmtResult Stmt(ParseCompoundStatement(attrs, true)); 1661 ExprType = CompoundStmt; 1662 1663 // If the substmt parsed correctly, build the AST node. 1664 if (!Stmt.isInvalid()) 1665 Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.take(), Tok.getLocation()); 1666 1667 } else if (ExprType >= CompoundLiteral && 1668 isTypeIdInParens(isAmbiguousTypeId)) { 1669 1670 // Otherwise, this is a compound literal expression or cast expression. 1671 1672 // In C++, if the type-id is ambiguous we disambiguate based on context. 1673 // If stopIfCastExpr is true the context is a typeof/sizeof/alignof 1674 // in which case we should treat it as type-id. 1675 // if stopIfCastExpr is false, we need to determine the context past the 1676 // parens, so we defer to ParseCXXAmbiguousParenExpression for that. 1677 if (isAmbiguousTypeId && !stopIfCastExpr) 1678 return ParseCXXAmbiguousParenExpression(ExprType, CastTy, 1679 OpenLoc, RParenLoc); 1680 1681 TypeResult Ty; 1682 1683 { 1684 InMessageExpressionRAIIObject InMessage(*this, false); 1685 Ty = ParseTypeName(); 1686 } 1687 1688 // If our type is followed by an identifier and either ':' or ']', then 1689 // this is probably an Objective-C message send where the leading '[' is 1690 // missing. Recover as if that were the case. 1691 if (!Ty.isInvalid() && Tok.is(tok::identifier) && !InMessageExpression && 1692 getLang().ObjC1 && !Ty.get().get().isNull() && 1693 (NextToken().is(tok::colon) || NextToken().is(tok::r_square)) && 1694 Ty.get().get()->isObjCObjectOrInterfaceType()) { 1695 Result = ParseObjCMessageExpressionBody(SourceLocation(), 1696 SourceLocation(), 1697 Ty.get(), 0); 1698 } else { 1699 // Match the ')'. 1700 if (Tok.is(tok::r_paren)) 1701 RParenLoc = ConsumeParen(); 1702 else 1703 MatchRHSPunctuation(tok::r_paren, OpenLoc); 1704 1705 if (Tok.is(tok::l_brace)) { 1706 ExprType = CompoundLiteral; 1707 return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc); 1708 } 1709 1710 if (ExprType == CastExpr) { 1711 // We parsed '(' type-name ')' and the thing after it wasn't a '{'. 1712 1713 if (Ty.isInvalid()) 1714 return ExprError(); 1715 1716 CastTy = Ty.get(); 1717 1718 // Note that this doesn't parse the subsequent cast-expression, it just 1719 // returns the parsed type to the callee. 1720 if (stopIfCastExpr) 1721 return ExprResult(); 1722 1723 // Reject the cast of super idiom in ObjC. 1724 if (Tok.is(tok::identifier) && getLang().ObjC1 && 1725 Tok.getIdentifierInfo() == Ident_super && 1726 getCurScope()->isInObjcMethodScope() && 1727 GetLookAheadToken(1).isNot(tok::period)) { 1728 Diag(Tok.getLocation(), diag::err_illegal_super_cast) 1729 << SourceRange(OpenLoc, RParenLoc); 1730 return ExprError(); 1731 } 1732 1733 // Parse the cast-expression that follows it next. 1734 // TODO: For cast expression with CastTy. 1735 Result = ParseCastExpression(false, false, CastTy); 1736 if (!Result.isInvalid()) 1737 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc, CastTy, 1738 RParenLoc, Result.take()); 1739 return move(Result); 1740 } 1741 1742 Diag(Tok, diag::err_expected_lbrace_in_compound_literal); 1743 return ExprError(); 1744 } 1745 } else if (TypeOfCast) { 1746 // Parse the expression-list. 1747 InMessageExpressionRAIIObject InMessage(*this, false); 1748 1749 ExprVector ArgExprs(Actions); 1750 CommaLocsTy CommaLocs; 1751 1752 if (!ParseExpressionList(ArgExprs, CommaLocs)) { 1753 ExprType = SimpleExpr; 1754 Result = Actions.ActOnParenOrParenListExpr(OpenLoc, Tok.getLocation(), 1755 move_arg(ArgExprs), TypeOfCast); 1756 } 1757 } else { 1758 InMessageExpressionRAIIObject InMessage(*this, false); 1759 1760 Result = ParseExpression(); 1761 ExprType = SimpleExpr; 1762 1763 // Don't build a paren expression unless we actually match a ')'. 1764 if (!Result.isInvalid() && Tok.is(tok::r_paren)) 1765 Result = Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.take()); 1766 } 1767 1768 // Match the ')'. 1769 if (Result.isInvalid()) { 1770 SkipUntil(tok::r_paren); 1771 return ExprError(); 1772 } 1773 1774 if (Tok.is(tok::r_paren)) 1775 RParenLoc = ConsumeParen(); 1776 else 1777 MatchRHSPunctuation(tok::r_paren, OpenLoc); 1778 1779 return move(Result); 1780} 1781 1782/// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name 1783/// and we are at the left brace. 1784/// 1785/// postfix-expression: [C99 6.5.2] 1786/// '(' type-name ')' '{' initializer-list '}' 1787/// '(' type-name ')' '{' initializer-list ',' '}' 1788/// 1789ExprResult 1790Parser::ParseCompoundLiteralExpression(ParsedType Ty, 1791 SourceLocation LParenLoc, 1792 SourceLocation RParenLoc) { 1793 assert(Tok.is(tok::l_brace) && "Not a compound literal!"); 1794 if (!getLang().C99) // Compound literals don't exist in C90. 1795 Diag(LParenLoc, diag::ext_c99_compound_literal); 1796 ExprResult Result = ParseInitializer(); 1797 if (!Result.isInvalid() && Ty) 1798 return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.take()); 1799 return move(Result); 1800} 1801 1802/// ParseStringLiteralExpression - This handles the various token types that 1803/// form string literals, and also handles string concatenation [C99 5.1.1.2, 1804/// translation phase #6]. 1805/// 1806/// primary-expression: [C99 6.5.1] 1807/// string-literal 1808ExprResult Parser::ParseStringLiteralExpression() { 1809 assert(isTokenStringLiteral() && "Not a string literal!"); 1810 1811 // String concat. Note that keywords like __func__ and __FUNCTION__ are not 1812 // considered to be strings for concatenation purposes. 1813 llvm::SmallVector<Token, 4> StringToks; 1814 1815 do { 1816 StringToks.push_back(Tok); 1817 ConsumeStringToken(); 1818 } while (isTokenStringLiteral()); 1819 1820 // Pass the set of string tokens, ready for concatenation, to the actions. 1821 return Actions.ActOnStringLiteral(&StringToks[0], StringToks.size()); 1822} 1823 1824/// ParseGenericSelectionExpression - Parse a C1X generic-selection 1825/// [C1X 6.5.1.1]. 1826/// 1827/// generic-selection: 1828/// _Generic ( assignment-expression , generic-assoc-list ) 1829/// generic-assoc-list: 1830/// generic-association 1831/// generic-assoc-list , generic-association 1832/// generic-association: 1833/// type-name : assignment-expression 1834/// default : assignment-expression 1835ExprResult Parser::ParseGenericSelectionExpression() { 1836 assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected"); 1837 SourceLocation KeyLoc = ConsumeToken(); 1838 1839 if (!getLang().C1X) 1840 Diag(KeyLoc, diag::ext_c1x_generic_selection); 1841 1842 SourceLocation LParenLoc = Tok.getLocation(); 1843 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen, "")) 1844 return ExprError(); 1845 1846 ExprResult ControllingExpr; 1847 { 1848 // C1X 6.5.1.1p3 "The controlling expression of a generic selection is 1849 // not evaluated." 1850 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated); 1851 ControllingExpr = ParseAssignmentExpression(); 1852 if (ControllingExpr.isInvalid()) { 1853 SkipUntil(tok::r_paren); 1854 return ExprError(); 1855 } 1856 } 1857 1858 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "")) { 1859 SkipUntil(tok::r_paren); 1860 return ExprError(); 1861 } 1862 1863 SourceLocation DefaultLoc; 1864 TypeVector Types(Actions); 1865 ExprVector Exprs(Actions); 1866 while (1) { 1867 ParsedType Ty; 1868 if (Tok.is(tok::kw_default)) { 1869 // C1X 6.5.1.1p2 "A generic selection shall have no more than one default 1870 // generic association." 1871 if (!DefaultLoc.isInvalid()) { 1872 Diag(Tok, diag::err_duplicate_default_assoc); 1873 Diag(DefaultLoc, diag::note_previous_default_assoc); 1874 SkipUntil(tok::r_paren); 1875 return ExprError(); 1876 } 1877 DefaultLoc = ConsumeToken(); 1878 Ty = ParsedType(); 1879 } else { 1880 ColonProtectionRAIIObject X(*this); 1881 TypeResult TR = ParseTypeName(); 1882 if (TR.isInvalid()) { 1883 SkipUntil(tok::r_paren); 1884 return ExprError(); 1885 } 1886 Ty = TR.release(); 1887 } 1888 Types.push_back(Ty); 1889 1890 if (ExpectAndConsume(tok::colon, diag::err_expected_colon, "")) { 1891 SkipUntil(tok::r_paren); 1892 return ExprError(); 1893 } 1894 1895 // FIXME: These expressions should be parsed in a potentially potentially 1896 // evaluated context. 1897 ExprResult ER(ParseAssignmentExpression()); 1898 if (ER.isInvalid()) { 1899 SkipUntil(tok::r_paren); 1900 return ExprError(); 1901 } 1902 Exprs.push_back(ER.release()); 1903 1904 if (Tok.isNot(tok::comma)) 1905 break; 1906 ConsumeToken(); 1907 } 1908 1909 SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc); 1910 if (RParenLoc.isInvalid()) 1911 return ExprError(); 1912 1913 return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc, RParenLoc, 1914 ControllingExpr.release(), 1915 move_arg(Types), move_arg(Exprs)); 1916} 1917 1918/// ParseExpressionList - Used for C/C++ (argument-)expression-list. 1919/// 1920/// argument-expression-list: 1921/// assignment-expression 1922/// argument-expression-list , assignment-expression 1923/// 1924/// [C++] expression-list: 1925/// [C++] assignment-expression ...[opt] 1926/// [C++] expression-list , assignment-expression ...[opt] 1927/// 1928bool Parser::ParseExpressionList(llvm::SmallVectorImpl<Expr*> &Exprs, 1929 llvm::SmallVectorImpl<SourceLocation> &CommaLocs, 1930 void (Sema::*Completer)(Scope *S, 1931 Expr *Data, 1932 Expr **Args, 1933 unsigned NumArgs), 1934 Expr *Data) { 1935 while (1) { 1936 if (Tok.is(tok::code_completion)) { 1937 if (Completer) 1938 (Actions.*Completer)(getCurScope(), Data, Exprs.data(), Exprs.size()); 1939 else 1940 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression); 1941 ConsumeCodeCompletionToken(); 1942 } 1943 1944 ExprResult Expr(ParseAssignmentExpression()); 1945 if (Tok.is(tok::ellipsis)) 1946 Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken()); 1947 if (Expr.isInvalid()) 1948 return true; 1949 1950 Exprs.push_back(Expr.release()); 1951 1952 if (Tok.isNot(tok::comma)) 1953 return false; 1954 // Move to the next argument, remember where the comma was. 1955 CommaLocs.push_back(ConsumeToken()); 1956 } 1957} 1958 1959/// ParseBlockId - Parse a block-id, which roughly looks like int (int x). 1960/// 1961/// [clang] block-id: 1962/// [clang] specifier-qualifier-list block-declarator 1963/// 1964void Parser::ParseBlockId() { 1965 if (Tok.is(tok::code_completion)) { 1966 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type); 1967 ConsumeCodeCompletionToken(); 1968 } 1969 1970 // Parse the specifier-qualifier-list piece. 1971 DeclSpec DS(AttrFactory); 1972 ParseSpecifierQualifierList(DS); 1973 1974 // Parse the block-declarator. 1975 Declarator DeclaratorInfo(DS, Declarator::BlockLiteralContext); 1976 ParseDeclarator(DeclaratorInfo); 1977 1978 // We do this for: ^ __attribute__((noreturn)) {, as DS has the attributes. 1979 DeclaratorInfo.takeAttributes(DS.getAttributes(), SourceLocation()); 1980 1981 MaybeParseGNUAttributes(DeclaratorInfo); 1982 1983 // Inform sema that we are starting a block. 1984 Actions.ActOnBlockArguments(DeclaratorInfo, getCurScope()); 1985} 1986 1987/// ParseBlockLiteralExpression - Parse a block literal, which roughly looks 1988/// like ^(int x){ return x+1; } 1989/// 1990/// block-literal: 1991/// [clang] '^' block-args[opt] compound-statement 1992/// [clang] '^' block-id compound-statement 1993/// [clang] block-args: 1994/// [clang] '(' parameter-list ')' 1995/// 1996ExprResult Parser::ParseBlockLiteralExpression() { 1997 assert(Tok.is(tok::caret) && "block literal starts with ^"); 1998 SourceLocation CaretLoc = ConsumeToken(); 1999 2000 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc, 2001 "block literal parsing"); 2002 2003 // Enter a scope to hold everything within the block. This includes the 2004 // argument decls, decls within the compound expression, etc. This also 2005 // allows determining whether a variable reference inside the block is 2006 // within or outside of the block. 2007 ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope | 2008 Scope::BreakScope | Scope::ContinueScope | 2009 Scope::DeclScope); 2010 2011 // Inform sema that we are starting a block. 2012 Actions.ActOnBlockStart(CaretLoc, getCurScope()); 2013 2014 // Parse the return type if present. 2015 DeclSpec DS(AttrFactory); 2016 Declarator ParamInfo(DS, Declarator::BlockLiteralContext); 2017 // FIXME: Since the return type isn't actually parsed, it can't be used to 2018 // fill ParamInfo with an initial valid range, so do it manually. 2019 ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation())); 2020 2021 // If this block has arguments, parse them. There is no ambiguity here with 2022 // the expression case, because the expression case requires a parameter list. 2023 if (Tok.is(tok::l_paren)) { 2024 ParseParenDeclarator(ParamInfo); 2025 // Parse the pieces after the identifier as if we had "int(...)". 2026 // SetIdentifier sets the source range end, but in this case we're past 2027 // that location. 2028 SourceLocation Tmp = ParamInfo.getSourceRange().getEnd(); 2029 ParamInfo.SetIdentifier(0, CaretLoc); 2030 ParamInfo.SetRangeEnd(Tmp); 2031 if (ParamInfo.isInvalidType()) { 2032 // If there was an error parsing the arguments, they may have 2033 // tried to use ^(x+y) which requires an argument list. Just 2034 // skip the whole block literal. 2035 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2036 return ExprError(); 2037 } 2038 2039 MaybeParseGNUAttributes(ParamInfo); 2040 2041 // Inform sema that we are starting a block. 2042 Actions.ActOnBlockArguments(ParamInfo, getCurScope()); 2043 } else if (!Tok.is(tok::l_brace)) { 2044 ParseBlockId(); 2045 } else { 2046 // Otherwise, pretend we saw (void). 2047 ParsedAttributes attrs(AttrFactory); 2048 ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(true, false, 2049 SourceLocation(), 2050 0, 0, 0, 2051 true, SourceLocation(), 2052 EST_None, 2053 SourceLocation(), 2054 0, 0, 0, 0, 2055 CaretLoc, CaretLoc, 2056 ParamInfo), 2057 attrs, CaretLoc); 2058 2059 MaybeParseGNUAttributes(ParamInfo); 2060 2061 // Inform sema that we are starting a block. 2062 Actions.ActOnBlockArguments(ParamInfo, getCurScope()); 2063 } 2064 2065 2066 ExprResult Result(true); 2067 if (!Tok.is(tok::l_brace)) { 2068 // Saw something like: ^expr 2069 Diag(Tok, diag::err_expected_expression); 2070 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2071 return ExprError(); 2072 } 2073 2074 StmtResult Stmt(ParseCompoundStatementBody()); 2075 BlockScope.Exit(); 2076 if (!Stmt.isInvalid()) 2077 Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.take(), getCurScope()); 2078 else 2079 Actions.ActOnBlockError(CaretLoc, getCurScope()); 2080 return move(Result); 2081} 2082