blob: a864e7c24cbad3bd7692a2e3886e10d34dfd1042 [file] [log] [blame]
Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- Parser.cpp - C Language Family Parser ----------------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Reid Spencer5f016e22007-07-11 17:01:13 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the Parser interfaces.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Parse/Parser.h"
Chris Lattner500d3292009-01-29 05:15:15 +000015#include "clang/Parse/ParseDiagnostic.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000016#include "clang/Parse/DeclSpec.h"
17#include "clang/Parse/Scope.h"
Douglas Gregor314b97f2009-11-10 19:49:08 +000018#include "clang/Parse/Template.h"
Chris Lattner0102c302009-03-05 07:24:28 +000019#include "llvm/Support/raw_ostream.h"
Chris Lattnerd167ca02009-12-10 00:21:05 +000020#include "RAIIObjectsForParser.h"
Daniel Dunbarfcdd8fe2008-10-04 19:21:03 +000021#include "ParsePragma.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000022using namespace clang;
23
Douglas Gregor2e222532009-07-02 17:08:52 +000024/// \brief A comment handler that passes comments found by the preprocessor
25/// to the parser action.
26class ActionCommentHandler : public CommentHandler {
27 Action &Actions;
Mike Stump1eb44332009-09-09 15:08:12 +000028
Douglas Gregor2e222532009-07-02 17:08:52 +000029public:
30 explicit ActionCommentHandler(Action &Actions) : Actions(Actions) { }
Mike Stump1eb44332009-09-09 15:08:12 +000031
Douglas Gregor2e222532009-07-02 17:08:52 +000032 virtual void HandleComment(Preprocessor &PP, SourceRange Comment) {
33 Actions.ActOnComment(Comment);
34 }
35};
36
Reid Spencer5f016e22007-07-11 17:01:13 +000037Parser::Parser(Preprocessor &pp, Action &actions)
Mike Stump1eb44332009-09-09 15:08:12 +000038 : CrashInfo(*this), PP(pp), Actions(actions), Diags(PP.getDiagnostics()),
Chris Lattner08d92ec2009-12-10 00:32:41 +000039 GreaterThanIsOperator(true), ColonIsSacred(false),
40 TemplateParameterDepth(0) {
Reid Spencer5f016e22007-07-11 17:01:13 +000041 Tok.setKind(tok::eof);
42 CurScope = 0;
Chris Lattner9e344c62007-07-15 00:04:39 +000043 NumCachedScopes = 0;
Reid Spencer5f016e22007-07-11 17:01:13 +000044 ParenCount = BracketCount = BraceCount = 0;
Chris Lattnerb28317a2009-03-28 19:18:32 +000045 ObjCImpDecl = DeclPtrTy();
Daniel Dunbarfcdd8fe2008-10-04 19:21:03 +000046
47 // Add #pragma handlers. These are removed and destroyed in the
48 // destructor.
Ted Kremenek4726d032009-03-23 22:28:25 +000049 PackHandler.reset(new
50 PragmaPackHandler(&PP.getIdentifierTable().get("pack"), actions));
51 PP.AddPragmaHandler(0, PackHandler.get());
Mike Stump1eb44332009-09-09 15:08:12 +000052
Ted Kremenek4726d032009-03-23 22:28:25 +000053 UnusedHandler.reset(new
54 PragmaUnusedHandler(&PP.getIdentifierTable().get("unused"), actions,
55 *this));
56 PP.AddPragmaHandler(0, UnusedHandler.get());
Eli Friedman99914792009-06-05 00:49:58 +000057
58 WeakHandler.reset(new
59 PragmaWeakHandler(&PP.getIdentifierTable().get("weak"), actions));
60 PP.AddPragmaHandler(0, WeakHandler.get());
Mike Stump1eb44332009-09-09 15:08:12 +000061
Douglas Gregor2e222532009-07-02 17:08:52 +000062 CommentHandler.reset(new ActionCommentHandler(actions));
Mike Stump1eb44332009-09-09 15:08:12 +000063 PP.AddCommentHandler(CommentHandler.get());
Reid Spencer5f016e22007-07-11 17:01:13 +000064}
65
Chris Lattner0102c302009-03-05 07:24:28 +000066/// If a crash happens while the parser is active, print out a line indicating
67/// what the current token is.
68void PrettyStackTraceParserEntry::print(llvm::raw_ostream &OS) const {
69 const Token &Tok = P.getCurToken();
Chris Lattnerddcbc0a2009-03-05 07:27:50 +000070 if (Tok.is(tok::eof)) {
Chris Lattner0102c302009-03-05 07:24:28 +000071 OS << "<eof> parser at end of file\n";
72 return;
73 }
Mike Stump1eb44332009-09-09 15:08:12 +000074
Chris Lattnerddcbc0a2009-03-05 07:27:50 +000075 if (Tok.getLocation().isInvalid()) {
76 OS << "<unknown> parser at unknown location\n";
77 return;
78 }
Mike Stump1eb44332009-09-09 15:08:12 +000079
Chris Lattner0102c302009-03-05 07:24:28 +000080 const Preprocessor &PP = P.getPreprocessor();
81 Tok.getLocation().print(OS, PP.getSourceManager());
Daniel Dunbar9fa31dd2009-10-17 06:13:04 +000082 if (Tok.isAnnotation())
83 OS << ": at annotation token \n";
84 else
85 OS << ": current parser token '" << PP.getSpelling(Tok) << "'\n";
Douglas Gregorf780abc2008-12-30 03:27:21 +000086}
Reid Spencer5f016e22007-07-11 17:01:13 +000087
Chris Lattner0102c302009-03-05 07:24:28 +000088
Chris Lattner3cbfe2c2008-11-22 00:59:29 +000089DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) {
Chris Lattner0102c302009-03-05 07:24:28 +000090 return Diags.Report(FullSourceLoc(Loc, PP.getSourceManager()), DiagID);
Chris Lattner1ab3b962008-11-18 07:48:38 +000091}
92
Chris Lattner3cbfe2c2008-11-22 00:59:29 +000093DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) {
Chris Lattner1ab3b962008-11-18 07:48:38 +000094 return Diag(Tok.getLocation(), DiagID);
Reid Spencer5f016e22007-07-11 17:01:13 +000095}
96
Douglas Gregor4b2d3f72009-02-26 21:00:50 +000097/// \brief Emits a diagnostic suggesting parentheses surrounding a
98/// given range.
99///
100/// \param Loc The location where we'll emit the diagnostic.
101/// \param Loc The kind of diagnostic to emit.
102/// \param ParenRange Source range enclosing code that should be parenthesized.
103void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK,
104 SourceRange ParenRange) {
Douglas Gregorb2fb6de2009-02-27 17:53:17 +0000105 SourceLocation EndLoc = PP.getLocForEndOfToken(ParenRange.getEnd());
106 if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000107 // We can't display the parentheses, so just dig the
108 // warning/error and return.
109 Diag(Loc, DK);
110 return;
111 }
Mike Stump1eb44332009-09-09 15:08:12 +0000112
113 Diag(Loc, DK)
Douglas Gregorb2fb6de2009-02-27 17:53:17 +0000114 << CodeModificationHint::CreateInsertion(ParenRange.getBegin(), "(")
115 << CodeModificationHint::CreateInsertion(EndLoc, ")");
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000116}
117
Reid Spencer5f016e22007-07-11 17:01:13 +0000118/// MatchRHSPunctuation - For punctuation with a LHS and RHS (e.g. '['/']'),
119/// this helper function matches and consumes the specified RHS token if
120/// present. If not present, it emits the specified diagnostic indicating
121/// that the parser failed to match the RHS of the token at LHSLoc. LHSName
122/// should be the name of the unmatched LHS token.
123SourceLocation Parser::MatchRHSPunctuation(tok::TokenKind RHSTok,
124 SourceLocation LHSLoc) {
Mike Stumpa6f01772008-06-19 19:28:49 +0000125
Chris Lattner00073222007-10-09 17:23:58 +0000126 if (Tok.is(RHSTok))
Reid Spencer5f016e22007-07-11 17:01:13 +0000127 return ConsumeAnyToken();
Mike Stumpa6f01772008-06-19 19:28:49 +0000128
Reid Spencer5f016e22007-07-11 17:01:13 +0000129 SourceLocation R = Tok.getLocation();
130 const char *LHSName = "unknown";
131 diag::kind DID = diag::err_parse_error;
132 switch (RHSTok) {
133 default: break;
134 case tok::r_paren : LHSName = "("; DID = diag::err_expected_rparen; break;
135 case tok::r_brace : LHSName = "{"; DID = diag::err_expected_rbrace; break;
136 case tok::r_square: LHSName = "["; DID = diag::err_expected_rsquare; break;
137 case tok::greater: LHSName = "<"; DID = diag::err_expected_greater; break;
138 }
139 Diag(Tok, DID);
Chris Lattner28eb7e92008-11-23 23:17:07 +0000140 Diag(LHSLoc, diag::note_matching) << LHSName;
Reid Spencer5f016e22007-07-11 17:01:13 +0000141 SkipUntil(RHSTok);
142 return R;
143}
144
145/// ExpectAndConsume - The parser expects that 'ExpectedTok' is next in the
146/// input. If so, it is consumed and false is returned.
147///
148/// If the input is malformed, this emits the specified diagnostic. Next, if
149/// SkipToTok is specified, it calls SkipUntil(SkipToTok). Finally, true is
150/// returned.
151bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID,
152 const char *Msg, tok::TokenKind SkipToTok) {
Chris Lattner00073222007-10-09 17:23:58 +0000153 if (Tok.is(ExpectedTok)) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000154 ConsumeAnyToken();
155 return false;
156 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000157
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000158 const char *Spelling = 0;
Douglas Gregorb2fb6de2009-02-27 17:53:17 +0000159 SourceLocation EndLoc = PP.getLocForEndOfToken(PrevTokLocation);
Mike Stump1eb44332009-09-09 15:08:12 +0000160 if (EndLoc.isValid() &&
Douglas Gregorb2fb6de2009-02-27 17:53:17 +0000161 (Spelling = tok::getTokenSimpleSpelling(ExpectedTok))) {
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000162 // Show what code to insert to fix this problem.
Mike Stump1eb44332009-09-09 15:08:12 +0000163 Diag(EndLoc, DiagID)
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000164 << Msg
Douglas Gregorb2fb6de2009-02-27 17:53:17 +0000165 << CodeModificationHint::CreateInsertion(EndLoc, Spelling);
Douglas Gregor4b2d3f72009-02-26 21:00:50 +0000166 } else
167 Diag(Tok, DiagID) << Msg;
168
Reid Spencer5f016e22007-07-11 17:01:13 +0000169 if (SkipToTok != tok::unknown)
170 SkipUntil(SkipToTok);
171 return true;
172}
173
174//===----------------------------------------------------------------------===//
175// Error recovery.
176//===----------------------------------------------------------------------===//
177
178/// SkipUntil - Read tokens until we get to the specified token, then consume
Chris Lattner012cf462007-07-24 17:03:04 +0000179/// it (unless DontConsume is true). Because we cannot guarantee that the
Reid Spencer5f016e22007-07-11 17:01:13 +0000180/// token will ever occur, this skips to the next token, or to some likely
181/// good stopping point. If StopAtSemi is true, skipping will stop at a ';'
182/// character.
Mike Stumpa6f01772008-06-19 19:28:49 +0000183///
Reid Spencer5f016e22007-07-11 17:01:13 +0000184/// If SkipUntil finds the specified token, it returns true, otherwise it
Mike Stumpa6f01772008-06-19 19:28:49 +0000185/// returns false.
Reid Spencer5f016e22007-07-11 17:01:13 +0000186bool Parser::SkipUntil(const tok::TokenKind *Toks, unsigned NumToks,
187 bool StopAtSemi, bool DontConsume) {
188 // We always want this function to skip at least one token if the first token
189 // isn't T and if not at EOF.
190 bool isFirstTokenSkipped = true;
191 while (1) {
192 // If we found one of the tokens, stop and return true.
193 for (unsigned i = 0; i != NumToks; ++i) {
Chris Lattner00073222007-10-09 17:23:58 +0000194 if (Tok.is(Toks[i])) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000195 if (DontConsume) {
196 // Noop, don't consume the token.
197 } else {
198 ConsumeAnyToken();
199 }
200 return true;
201 }
202 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000203
Reid Spencer5f016e22007-07-11 17:01:13 +0000204 switch (Tok.getKind()) {
205 case tok::eof:
206 // Ran out of tokens.
207 return false;
Mike Stumpa6f01772008-06-19 19:28:49 +0000208
Reid Spencer5f016e22007-07-11 17:01:13 +0000209 case tok::l_paren:
210 // Recursively skip properly-nested parens.
211 ConsumeParen();
212 SkipUntil(tok::r_paren, false);
213 break;
214 case tok::l_square:
215 // Recursively skip properly-nested square brackets.
216 ConsumeBracket();
217 SkipUntil(tok::r_square, false);
218 break;
219 case tok::l_brace:
220 // Recursively skip properly-nested braces.
221 ConsumeBrace();
222 SkipUntil(tok::r_brace, false);
223 break;
Mike Stumpa6f01772008-06-19 19:28:49 +0000224
Reid Spencer5f016e22007-07-11 17:01:13 +0000225 // Okay, we found a ']' or '}' or ')', which we think should be balanced.
226 // Since the user wasn't looking for this token (if they were, it would
227 // already be handled), this isn't balanced. If there is a LHS token at a
228 // higher level, we will assume that this matches the unbalanced token
229 // and return it. Otherwise, this is a spurious RHS token, which we skip.
230 case tok::r_paren:
231 if (ParenCount && !isFirstTokenSkipped)
232 return false; // Matches something.
233 ConsumeParen();
234 break;
235 case tok::r_square:
236 if (BracketCount && !isFirstTokenSkipped)
237 return false; // Matches something.
238 ConsumeBracket();
239 break;
240 case tok::r_brace:
241 if (BraceCount && !isFirstTokenSkipped)
242 return false; // Matches something.
243 ConsumeBrace();
244 break;
Mike Stumpa6f01772008-06-19 19:28:49 +0000245
Reid Spencer5f016e22007-07-11 17:01:13 +0000246 case tok::string_literal:
247 case tok::wide_string_literal:
248 ConsumeStringToken();
249 break;
250 case tok::semi:
251 if (StopAtSemi)
252 return false;
253 // FALL THROUGH.
254 default:
255 // Skip this token.
256 ConsumeToken();
257 break;
258 }
259 isFirstTokenSkipped = false;
Mike Stumpa6f01772008-06-19 19:28:49 +0000260 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000261}
262
263//===----------------------------------------------------------------------===//
264// Scope manipulation
265//===----------------------------------------------------------------------===//
266
Reid Spencer5f016e22007-07-11 17:01:13 +0000267/// EnterScope - Start a new scope.
268void Parser::EnterScope(unsigned ScopeFlags) {
Chris Lattner9e344c62007-07-15 00:04:39 +0000269 if (NumCachedScopes) {
270 Scope *N = ScopeCache[--NumCachedScopes];
Reid Spencer5f016e22007-07-11 17:01:13 +0000271 N->Init(CurScope, ScopeFlags);
272 CurScope = N;
273 } else {
274 CurScope = new Scope(CurScope, ScopeFlags);
275 }
276}
277
278/// ExitScope - Pop a scope off the scope stack.
279void Parser::ExitScope() {
280 assert(CurScope && "Scope imbalance!");
281
Chris Lattner90ae68a2007-10-09 20:37:18 +0000282 // Inform the actions module that this scope is going away if there are any
283 // decls in it.
284 if (!CurScope->decl_empty())
Steve Naroffb216c882007-10-09 22:01:59 +0000285 Actions.ActOnPopScope(Tok.getLocation(), CurScope);
Mike Stumpa6f01772008-06-19 19:28:49 +0000286
Chris Lattner9e344c62007-07-15 00:04:39 +0000287 Scope *OldScope = CurScope;
288 CurScope = OldScope->getParent();
Mike Stumpa6f01772008-06-19 19:28:49 +0000289
Chris Lattner9e344c62007-07-15 00:04:39 +0000290 if (NumCachedScopes == ScopeCacheSize)
291 delete OldScope;
Reid Spencer5f016e22007-07-11 17:01:13 +0000292 else
Chris Lattner9e344c62007-07-15 00:04:39 +0000293 ScopeCache[NumCachedScopes++] = OldScope;
Reid Spencer5f016e22007-07-11 17:01:13 +0000294}
295
296
297
298
299//===----------------------------------------------------------------------===//
300// C99 6.9: External Definitions.
301//===----------------------------------------------------------------------===//
302
303Parser::~Parser() {
304 // If we still have scopes active, delete the scope tree.
305 delete CurScope;
Mike Stumpa6f01772008-06-19 19:28:49 +0000306
Reid Spencer5f016e22007-07-11 17:01:13 +0000307 // Free the scope cache.
Chris Lattner9e344c62007-07-15 00:04:39 +0000308 for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
309 delete ScopeCache[i];
Daniel Dunbarfcdd8fe2008-10-04 19:21:03 +0000310
311 // Remove the pragma handlers we installed.
Ted Kremenek4726d032009-03-23 22:28:25 +0000312 PP.RemovePragmaHandler(0, PackHandler.get());
313 PackHandler.reset();
314 PP.RemovePragmaHandler(0, UnusedHandler.get());
315 UnusedHandler.reset();
Eli Friedman99914792009-06-05 00:49:58 +0000316 PP.RemovePragmaHandler(0, WeakHandler.get());
317 WeakHandler.reset();
Douglas Gregor2e222532009-07-02 17:08:52 +0000318 PP.RemoveCommentHandler(CommentHandler.get());
Reid Spencer5f016e22007-07-11 17:01:13 +0000319}
320
321/// Initialize - Warm up the parser.
322///
323void Parser::Initialize() {
324 // Prime the lexer look-ahead.
325 ConsumeToken();
Mike Stumpa6f01772008-06-19 19:28:49 +0000326
Chris Lattner31e05722007-08-26 06:24:45 +0000327 // Create the translation unit scope. Install it as the current scope.
Reid Spencer5f016e22007-07-11 17:01:13 +0000328 assert(CurScope == 0 && "A scope is already active?");
Chris Lattner31e05722007-08-26 06:24:45 +0000329 EnterScope(Scope::DeclScope);
Steve Naroffb216c882007-10-09 22:01:59 +0000330 Actions.ActOnTranslationUnitScope(Tok.getLocation(), CurScope);
Mike Stumpa6f01772008-06-19 19:28:49 +0000331
Chris Lattner00073222007-10-09 17:23:58 +0000332 if (Tok.is(tok::eof) &&
Chris Lattnerf7261752007-08-25 05:47:03 +0000333 !getLang().CPlusPlus) // Empty source file is an extension in C
Reid Spencer5f016e22007-07-11 17:01:13 +0000334 Diag(Tok, diag::ext_empty_source_file);
Mike Stumpa6f01772008-06-19 19:28:49 +0000335
Chris Lattner34870da2007-08-29 22:54:08 +0000336 // Initialization for Objective-C context sensitive keywords recognition.
Ted Kremeneka526c5c2008-01-07 19:49:32 +0000337 // Referenced in Parser::ParseObjCTypeQualifierList.
Chris Lattner34870da2007-08-29 22:54:08 +0000338 if (getLang().ObjC1) {
Ted Kremeneka526c5c2008-01-07 19:49:32 +0000339 ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
340 ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
341 ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
342 ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
343 ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
344 ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
Chris Lattner34870da2007-08-29 22:54:08 +0000345 }
Daniel Dunbar662e8b52008-08-14 22:04:54 +0000346
347 Ident_super = &PP.getIdentifierTable().get("super");
Reid Spencer5f016e22007-07-11 17:01:13 +0000348}
349
350/// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
351/// action tells us to. This returns true if the EOF was encountered.
Chris Lattner682bf922009-03-29 16:50:03 +0000352bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
353 Result = DeclGroupPtrTy();
Chris Lattner9299f3f2008-08-23 03:19:52 +0000354 if (Tok.is(tok::eof)) {
355 Actions.ActOnEndOfTranslationUnit();
356 return true;
357 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000358
Sean Huntbbd37c62009-11-21 08:43:09 +0000359 CXX0XAttributeList Attr;
360 if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
361 Attr = ParseCXX0XAttributes();
362 Result = ParseExternalDeclaration(Attr);
Reid Spencer5f016e22007-07-11 17:01:13 +0000363 return false;
364}
365
Reid Spencer5f016e22007-07-11 17:01:13 +0000366/// ParseTranslationUnit:
367/// translation-unit: [C99 6.9]
Mike Stumpa6f01772008-06-19 19:28:49 +0000368/// external-declaration
369/// translation-unit external-declaration
Reid Spencer5f016e22007-07-11 17:01:13 +0000370void Parser::ParseTranslationUnit() {
Douglas Gregor8935b8b2008-12-10 06:34:36 +0000371 Initialize();
Mike Stumpa6f01772008-06-19 19:28:49 +0000372
Chris Lattner682bf922009-03-29 16:50:03 +0000373 DeclGroupPtrTy Res;
Steve Naroff89307ff2007-11-29 23:05:20 +0000374 while (!ParseTopLevelDecl(Res))
Reid Spencer5f016e22007-07-11 17:01:13 +0000375 /*parse them all*/;
Mike Stump1eb44332009-09-09 15:08:12 +0000376
Chris Lattner06f54852008-08-23 02:00:52 +0000377 ExitScope();
378 assert(CurScope == 0 && "Scope imbalance!");
Reid Spencer5f016e22007-07-11 17:01:13 +0000379}
380
381/// ParseExternalDeclaration:
Chris Lattner90b93d62008-12-08 21:59:01 +0000382///
Douglas Gregorc19923d2008-11-21 16:10:08 +0000383/// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
Chris Lattnerc3018152007-08-10 20:57:02 +0000384/// function-definition
385/// declaration
Douglas Gregora1d71ae2009-08-24 12:17:54 +0000386/// [C++0x] empty-declaration
Reid Spencer5f016e22007-07-11 17:01:13 +0000387/// [GNU] asm-definition
Chris Lattnerc3018152007-08-10 20:57:02 +0000388/// [GNU] __extension__ external-declaration
Reid Spencer5f016e22007-07-11 17:01:13 +0000389/// [OBJC] objc-class-definition
390/// [OBJC] objc-class-declaration
391/// [OBJC] objc-alias-declaration
392/// [OBJC] objc-protocol-definition
393/// [OBJC] objc-method-definition
394/// [OBJC] @end
Douglas Gregorc19923d2008-11-21 16:10:08 +0000395/// [C++] linkage-specification
Reid Spencer5f016e22007-07-11 17:01:13 +0000396/// [GNU] asm-definition:
397/// simple-asm-expr ';'
398///
Douglas Gregora1d71ae2009-08-24 12:17:54 +0000399/// [C++0x] empty-declaration:
400/// ';'
401///
Douglas Gregor45f96552009-09-04 06:33:52 +0000402/// [C++0x/GNU] 'extern' 'template' declaration
Sean Huntbbd37c62009-11-21 08:43:09 +0000403Parser::DeclGroupPtrTy Parser::ParseExternalDeclaration(CXX0XAttributeList Attr) {
Chris Lattner682bf922009-03-29 16:50:03 +0000404 DeclPtrTy SingleDecl;
Reid Spencer5f016e22007-07-11 17:01:13 +0000405 switch (Tok.getKind()) {
406 case tok::semi:
Douglas Gregora1d71ae2009-08-24 12:17:54 +0000407 if (!getLang().CPlusPlus0x)
408 Diag(Tok, diag::ext_top_level_semi)
Chris Lattner29d9c1a2009-12-06 17:36:05 +0000409 << CodeModificationHint::CreateRemoval(Tok.getLocation());
Mike Stump1eb44332009-09-09 15:08:12 +0000410
Reid Spencer5f016e22007-07-11 17:01:13 +0000411 ConsumeToken();
412 // TODO: Invoke action for top-level semicolon.
Chris Lattner682bf922009-03-29 16:50:03 +0000413 return DeclGroupPtrTy();
Chris Lattner90b93d62008-12-08 21:59:01 +0000414 case tok::r_brace:
415 Diag(Tok, diag::err_expected_external_declaration);
416 ConsumeBrace();
Chris Lattner682bf922009-03-29 16:50:03 +0000417 return DeclGroupPtrTy();
Chris Lattner90b93d62008-12-08 21:59:01 +0000418 case tok::eof:
419 Diag(Tok, diag::err_expected_external_declaration);
Chris Lattner682bf922009-03-29 16:50:03 +0000420 return DeclGroupPtrTy();
Chris Lattnerc3018152007-08-10 20:57:02 +0000421 case tok::kw___extension__: {
Chris Lattnerc46d1a12008-10-20 06:45:43 +0000422 // __extension__ silences extension warnings in the subexpression.
423 ExtensionRAIIObject O(Diags); // Use RAII to do this.
Chris Lattner39146d62008-10-20 06:51:33 +0000424 ConsumeToken();
Sean Huntbbd37c62009-11-21 08:43:09 +0000425 return ParseExternalDeclaration(Attr);
Chris Lattnerc3018152007-08-10 20:57:02 +0000426 }
Anders Carlssondfab6cb2008-02-08 00:33:21 +0000427 case tok::kw_asm: {
Sean Huntbbd37c62009-11-21 08:43:09 +0000428 if (Attr.HasAttr)
429 Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
430 << Attr.Range;
431
Sebastian Redleffa8d12008-12-10 00:02:53 +0000432 OwningExprResult Result(ParseSimpleAsm());
Mike Stumpa6f01772008-06-19 19:28:49 +0000433
Anders Carlsson3f9424f2008-02-08 00:23:11 +0000434 ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
435 "top-level asm block");
Anders Carlssondfab6cb2008-02-08 00:33:21 +0000436
Chris Lattner682bf922009-03-29 16:50:03 +0000437 if (Result.isInvalid())
438 return DeclGroupPtrTy();
439 SingleDecl = Actions.ActOnFileScopeAsmDecl(Tok.getLocation(), move(Result));
440 break;
Anders Carlssondfab6cb2008-02-08 00:33:21 +0000441 }
Reid Spencer5f016e22007-07-11 17:01:13 +0000442 case tok::at:
Chris Lattner682bf922009-03-29 16:50:03 +0000443 // @ is not a legal token unless objc is enabled, no need to check for ObjC.
444 /// FIXME: ParseObjCAtDirectives should return a DeclGroup for things like
445 /// @class foo, bar;
446 SingleDecl = ParseObjCAtDirectives();
447 break;
Reid Spencer5f016e22007-07-11 17:01:13 +0000448 case tok::minus:
Reid Spencer5f016e22007-07-11 17:01:13 +0000449 case tok::plus:
Chris Lattner682bf922009-03-29 16:50:03 +0000450 if (!getLang().ObjC1) {
451 Diag(Tok, diag::err_expected_external_declaration);
452 ConsumeToken();
453 return DeclGroupPtrTy();
454 }
455 SingleDecl = ParseObjCMethodDefinition();
456 break;
Douglas Gregor791215b2009-09-21 20:51:25 +0000457 case tok::code_completion:
458 Actions.CodeCompleteOrdinaryName(CurScope);
459 ConsumeToken();
Sean Huntbbd37c62009-11-21 08:43:09 +0000460 return ParseExternalDeclaration(Attr);
Douglas Gregorf780abc2008-12-30 03:27:21 +0000461 case tok::kw_using:
Chris Lattner8f08cb72007-08-25 06:57:03 +0000462 case tok::kw_namespace:
Reid Spencer5f016e22007-07-11 17:01:13 +0000463 case tok::kw_typedef:
Douglas Gregoradcac882008-12-01 23:54:00 +0000464 case tok::kw_template:
465 case tok::kw_export: // As in 'export template'
Anders Carlsson511d7ab2009-03-11 16:27:10 +0000466 case tok::kw_static_assert:
Chris Lattnerbae35112007-08-25 18:15:16 +0000467 // A function definition cannot start with a these keywords.
Chris Lattner97144fc2009-04-02 04:16:50 +0000468 {
469 SourceLocation DeclEnd;
Sean Huntbbd37c62009-11-21 08:43:09 +0000470 return ParseDeclaration(Declarator::FileContext, DeclEnd, Attr);
Chris Lattner97144fc2009-04-02 04:16:50 +0000471 }
Douglas Gregor45f96552009-09-04 06:33:52 +0000472 case tok::kw_extern:
473 if (getLang().CPlusPlus && NextToken().is(tok::kw_template)) {
474 // Extern templates
475 SourceLocation ExternLoc = ConsumeToken();
476 SourceLocation TemplateLoc = ConsumeToken();
477 SourceLocation DeclEnd;
478 return Actions.ConvertDeclToDeclGroup(
479 ParseExplicitInstantiation(ExternLoc, TemplateLoc, DeclEnd));
480 }
Mike Stump1eb44332009-09-09 15:08:12 +0000481
Douglas Gregor45f96552009-09-04 06:33:52 +0000482 // FIXME: Detect C++ linkage specifications here?
Mike Stump1eb44332009-09-09 15:08:12 +0000483
Douglas Gregor45f96552009-09-04 06:33:52 +0000484 // Fall through to handle other declarations or function definitions.
Mike Stump1eb44332009-09-09 15:08:12 +0000485
Reid Spencer5f016e22007-07-11 17:01:13 +0000486 default:
487 // We can't tell whether this is a function-definition or declaration yet.
Sean Huntbbd37c62009-11-21 08:43:09 +0000488 return ParseDeclarationOrFunctionDefinition(Attr.AttrList);
Reid Spencer5f016e22007-07-11 17:01:13 +0000489 }
Mike Stump1eb44332009-09-09 15:08:12 +0000490
Chris Lattner682bf922009-03-29 16:50:03 +0000491 // This routine returns a DeclGroup, if the thing we parsed only contains a
492 // single decl, convert it now.
493 return Actions.ConvertDeclToDeclGroup(SingleDecl);
Reid Spencer5f016e22007-07-11 17:01:13 +0000494}
495
Douglas Gregor1426e532009-05-12 21:31:51 +0000496/// \brief Determine whether the current token, if it occurs after a
497/// declarator, continues a declaration or declaration list.
498bool Parser::isDeclarationAfterDeclarator() {
499 return Tok.is(tok::equal) || // int X()= -> not a function def
500 Tok.is(tok::comma) || // int X(), -> not a function def
501 Tok.is(tok::semi) || // int X(); -> not a function def
502 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
503 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
504 (getLang().CPlusPlus &&
505 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
506}
507
508/// \brief Determine whether the current token, if it occurs after a
509/// declarator, indicates the start of a function definition.
510bool Parser::isStartOfFunctionDefinition() {
Chris Lattner5d1c6192009-12-06 18:34:27 +0000511 if (Tok.is(tok::l_brace)) // int X() {}
512 return true;
513
514 if (!getLang().CPlusPlus)
515 return isDeclarationSpecifier(); // int X(f) int f; {}
516 return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
517 Tok.is(tok::kw_try); // X() try { ... }
Douglas Gregor1426e532009-05-12 21:31:51 +0000518}
519
Reid Spencer5f016e22007-07-11 17:01:13 +0000520/// ParseDeclarationOrFunctionDefinition - Parse either a function-definition or
521/// a declaration. We can't tell which we have until we read up to the
Douglas Gregorc4b4e7b2008-12-24 02:52:09 +0000522/// compound-statement in function-definition. TemplateParams, if
523/// non-NULL, provides the template parameters when we're parsing a
Mike Stump1eb44332009-09-09 15:08:12 +0000524/// C++ template-declaration.
Reid Spencer5f016e22007-07-11 17:01:13 +0000525///
526/// function-definition: [C99 6.9.1]
Chris Lattnera798ebc2008-04-05 05:52:15 +0000527/// decl-specs declarator declaration-list[opt] compound-statement
528/// [C90] function-definition: [C99 6.7.1] - implicit int result
Mike Stumpa6f01772008-06-19 19:28:49 +0000529/// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
Chris Lattnera798ebc2008-04-05 05:52:15 +0000530///
Reid Spencer5f016e22007-07-11 17:01:13 +0000531/// declaration: [C99 6.7]
Chris Lattner697e15f2007-08-22 06:06:56 +0000532/// declaration-specifiers init-declarator-list[opt] ';'
533/// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
Reid Spencer5f016e22007-07-11 17:01:13 +0000534/// [OMP] threadprivate-directive [TODO]
535///
Chris Lattner682bf922009-03-29 16:50:03 +0000536Parser::DeclGroupPtrTy
Fariborz Jahanian3acd9aa2009-12-09 21:39:38 +0000537Parser::ParseDeclarationOrFunctionDefinition(ParsingDeclSpec &DS,
538 AttributeList *Attr,
Sean Huntbbd37c62009-11-21 08:43:09 +0000539 AccessSpecifier AS) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000540 // Parse the common declaration-specifiers piece.
Sean Huntbbd37c62009-11-21 08:43:09 +0000541 if (Attr)
542 DS.AddAttributes(Attr);
543
Douglas Gregor4d9a16f2009-05-12 23:25:50 +0000544 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS);
Mike Stumpa6f01772008-06-19 19:28:49 +0000545
Reid Spencer5f016e22007-07-11 17:01:13 +0000546 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
547 // declaration-specifiers init-declarator-list[opt] ';'
Chris Lattner00073222007-10-09 17:23:58 +0000548 if (Tok.is(tok::semi)) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000549 ConsumeToken();
Chris Lattner682bf922009-03-29 16:50:03 +0000550 DeclPtrTy TheDecl = Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
John McCall54abf7d2009-11-04 02:18:39 +0000551 DS.complete(TheDecl);
Chris Lattner682bf922009-03-29 16:50:03 +0000552 return Actions.ConvertDeclToDeclGroup(TheDecl);
Reid Spencer5f016e22007-07-11 17:01:13 +0000553 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000554
Daniel Dunbar246e70f2008-09-26 04:48:09 +0000555 // ObjC2 allows prefix attributes on class interfaces and protocols.
556 // FIXME: This still needs better diagnostics. We should only accept
557 // attributes here, no types, etc.
Chris Lattner00073222007-10-09 17:23:58 +0000558 if (getLang().ObjC2 && Tok.is(tok::at)) {
Steve Naroffdac269b2007-08-20 21:31:48 +0000559 SourceLocation AtLoc = ConsumeToken(); // the "@"
Mike Stump1eb44332009-09-09 15:08:12 +0000560 if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
Daniel Dunbar246e70f2008-09-26 04:48:09 +0000561 !Tok.isObjCAtKeyword(tok::objc_protocol)) {
562 Diag(Tok, diag::err_objc_unexpected_attr);
Chris Lattnercb53b362007-12-27 19:57:00 +0000563 SkipUntil(tok::semi); // FIXME: better skip?
Chris Lattner682bf922009-03-29 16:50:03 +0000564 return DeclGroupPtrTy();
Chris Lattnercb53b362007-12-27 19:57:00 +0000565 }
John McCalld8ac0572009-11-03 19:26:08 +0000566
John McCall54abf7d2009-11-04 02:18:39 +0000567 DS.abort();
568
Fariborz Jahanian0de2ae22008-01-02 19:17:38 +0000569 const char *PrevSpec = 0;
John McCallfec54012009-08-03 20:12:06 +0000570 unsigned DiagID;
571 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID))
572 Diag(AtLoc, DiagID) << PrevSpec;
Mike Stump1eb44332009-09-09 15:08:12 +0000573
Chris Lattner682bf922009-03-29 16:50:03 +0000574 DeclPtrTy TheDecl;
Daniel Dunbar246e70f2008-09-26 04:48:09 +0000575 if (Tok.isObjCAtKeyword(tok::objc_protocol))
Chris Lattner682bf922009-03-29 16:50:03 +0000576 TheDecl = ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
577 else
578 TheDecl = ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes());
579 return Actions.ConvertDeclToDeclGroup(TheDecl);
Steve Naroffdac269b2007-08-20 21:31:48 +0000580 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000581
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000582 // If the declspec consisted only of 'extern' and we have a string
583 // literal following it, this must be a C++ linkage specifier like
584 // 'extern "C"'.
Chris Lattner3c6f6a72008-01-12 07:08:43 +0000585 if (Tok.is(tok::string_literal) && getLang().CPlusPlus &&
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000586 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
Chris Lattner682bf922009-03-29 16:50:03 +0000587 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
John McCall54abf7d2009-11-04 02:18:39 +0000588 DS.abort();
Fariborz Jahanian3acd9aa2009-12-09 21:39:38 +0000589 DeclPtrTy TheDecl = ParseLinkage(DS, Declarator::FileContext);
Chris Lattner682bf922009-03-29 16:50:03 +0000590 return Actions.ConvertDeclToDeclGroup(TheDecl);
591 }
Chris Lattnerc6fdc342008-01-12 07:05:38 +0000592
John McCalld8ac0572009-11-03 19:26:08 +0000593 return ParseDeclGroup(DS, Declarator::FileContext, true);
Reid Spencer5f016e22007-07-11 17:01:13 +0000594}
595
Fariborz Jahanian3acd9aa2009-12-09 21:39:38 +0000596Parser::DeclGroupPtrTy
597Parser::ParseDeclarationOrFunctionDefinition(AttributeList *Attr,
598 AccessSpecifier AS) {
599 ParsingDeclSpec DS(*this);
600 return ParseDeclarationOrFunctionDefinition(DS, Attr, AS);
601}
602
Reid Spencer5f016e22007-07-11 17:01:13 +0000603/// ParseFunctionDefinition - We parsed and verified that the specified
604/// Declarator is well formed. If this is a K&R-style function, read the
605/// parameters declaration-list, then start the compound-statement.
606///
Chris Lattnera798ebc2008-04-05 05:52:15 +0000607/// function-definition: [C99 6.9.1]
608/// decl-specs declarator declaration-list[opt] compound-statement
609/// [C90] function-definition: [C99 6.7.1] - implicit int result
Mike Stumpa6f01772008-06-19 19:28:49 +0000610/// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
Douglas Gregor7ad83902008-11-05 04:29:56 +0000611/// [C++] function-definition: [C++ 8.4]
Chris Lattner23c4b182009-03-29 17:18:04 +0000612/// decl-specifier-seq[opt] declarator ctor-initializer[opt]
613/// function-body
Douglas Gregor7ad83902008-11-05 04:29:56 +0000614/// [C++] function-definition: [C++ 8.4]
Sebastian Redld3a413d2009-04-26 20:35:05 +0000615/// decl-specifier-seq[opt] declarator function-try-block
Reid Spencer5f016e22007-07-11 17:01:13 +0000616///
John McCall54abf7d2009-11-04 02:18:39 +0000617Parser::DeclPtrTy Parser::ParseFunctionDefinition(ParsingDeclarator &D,
Douglas Gregor52591bf2009-06-24 00:54:41 +0000618 const ParsedTemplateInfo &TemplateInfo) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000619 const DeclaratorChunk &FnTypeInfo = D.getTypeObject(0);
620 assert(FnTypeInfo.Kind == DeclaratorChunk::Function &&
621 "This isn't a function declarator!");
622 const DeclaratorChunk::FunctionTypeInfo &FTI = FnTypeInfo.Fun;
Mike Stumpa6f01772008-06-19 19:28:49 +0000623
Chris Lattnera798ebc2008-04-05 05:52:15 +0000624 // If this is C90 and the declspecs were completely missing, fudge in an
625 // implicit int. We do this here because this is the only place where
626 // declaration-specifiers are completely optional in the grammar.
Chris Lattner2a327d12009-02-27 18:35:46 +0000627 if (getLang().ImplicitInt && D.getDeclSpec().isEmpty()) {
Chris Lattnera798ebc2008-04-05 05:52:15 +0000628 const char *PrevSpec;
John McCallfec54012009-08-03 20:12:06 +0000629 unsigned DiagID;
Chris Lattner31c28682008-10-20 02:01:34 +0000630 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
631 D.getIdentifierLoc(),
John McCallfec54012009-08-03 20:12:06 +0000632 PrevSpec, DiagID);
Sebastian Redlab197ba2009-02-09 18:23:29 +0000633 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
Chris Lattnera798ebc2008-04-05 05:52:15 +0000634 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000635
Reid Spencer5f016e22007-07-11 17:01:13 +0000636 // If this declaration was formed with a K&R-style identifier list for the
637 // arguments, parse declarations for all of the args next.
638 // int foo(a,b) int a; float b; {}
639 if (!FTI.hasPrototype && FTI.NumArgs != 0)
640 ParseKNRParamDeclarations(D);
641
Douglas Gregor7ad83902008-11-05 04:29:56 +0000642 // We should have either an opening brace or, in a C++ constructor,
643 // we may have a colon.
Sebastian Redld3a413d2009-04-26 20:35:05 +0000644 if (Tok.isNot(tok::l_brace) && Tok.isNot(tok::colon) &&
645 Tok.isNot(tok::kw_try)) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000646 Diag(Tok, diag::err_expected_fn_body);
647
648 // Skip over garbage, until we get to '{'. Don't eat the '{'.
649 SkipUntil(tok::l_brace, true, true);
Mike Stumpa6f01772008-06-19 19:28:49 +0000650
Reid Spencer5f016e22007-07-11 17:01:13 +0000651 // If we didn't find the '{', bail out.
Chris Lattner00073222007-10-09 17:23:58 +0000652 if (Tok.isNot(tok::l_brace))
Chris Lattnerb28317a2009-03-28 19:18:32 +0000653 return DeclPtrTy();
Reid Spencer5f016e22007-07-11 17:01:13 +0000654 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000655
Chris Lattnerb652cea2007-10-09 17:14:05 +0000656 // Enter a scope for the function body.
Douglas Gregor8935b8b2008-12-10 06:34:36 +0000657 ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
Mike Stumpa6f01772008-06-19 19:28:49 +0000658
Chris Lattnerb652cea2007-10-09 17:14:05 +0000659 // Tell the actions module that we have entered a function definition with the
660 // specified Declarator for the function.
Mike Stump1eb44332009-09-09 15:08:12 +0000661 DeclPtrTy Res = TemplateInfo.TemplateParams?
Douglas Gregor52591bf2009-06-24 00:54:41 +0000662 Actions.ActOnStartOfFunctionTemplateDef(CurScope,
663 Action::MultiTemplateParamsArg(Actions,
664 TemplateInfo.TemplateParams->data(),
665 TemplateInfo.TemplateParams->size()),
666 D)
667 : Actions.ActOnStartOfFunctionDef(CurScope, D);
Mike Stumpa6f01772008-06-19 19:28:49 +0000668
John McCall54abf7d2009-11-04 02:18:39 +0000669 // Break out of the ParsingDeclarator context before we parse the body.
670 D.complete(Res);
671
672 // Break out of the ParsingDeclSpec context, too. This const_cast is
673 // safe because we're always the sole owner.
674 D.getMutableDeclSpec().abort();
675
Sebastian Redld3a413d2009-04-26 20:35:05 +0000676 if (Tok.is(tok::kw_try))
677 return ParseFunctionTryBlock(Res);
678
Douglas Gregor7ad83902008-11-05 04:29:56 +0000679 // If we have a colon, then we're probably parsing a C++
680 // ctor-initializer.
681 if (Tok.is(tok::colon))
682 ParseConstructorInitializer(Res);
Fariborz Jahanian0849d382009-07-14 20:06:22 +0000683 else
Fariborz Jahanian393612e2009-07-21 22:36:06 +0000684 Actions.ActOnDefaultCtorInitializers(Res);
Douglas Gregor7ad83902008-11-05 04:29:56 +0000685
Chris Lattner40e9bc82009-03-05 00:49:17 +0000686 return ParseFunctionStatementBody(Res);
Reid Spencer5f016e22007-07-11 17:01:13 +0000687}
688
689/// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
690/// types for a function with a K&R-style identifier list for arguments.
691void Parser::ParseKNRParamDeclarations(Declarator &D) {
692 // We know that the top-level of this declarator is a function.
693 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
694
Chris Lattner04421082008-04-08 04:40:51 +0000695 // Enter function-declaration scope, limiting any declarators to the
696 // function prototype scope, including parameter declarators.
Douglas Gregor3218c4b2009-01-09 22:42:13 +0000697 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope|Scope::DeclScope);
Chris Lattner04421082008-04-08 04:40:51 +0000698
Reid Spencer5f016e22007-07-11 17:01:13 +0000699 // Read all the argument declarations.
700 while (isDeclarationSpecifier()) {
701 SourceLocation DSStart = Tok.getLocation();
Mike Stumpa6f01772008-06-19 19:28:49 +0000702
Reid Spencer5f016e22007-07-11 17:01:13 +0000703 // Parse the common declaration-specifiers piece.
704 DeclSpec DS;
705 ParseDeclarationSpecifiers(DS);
Mike Stumpa6f01772008-06-19 19:28:49 +0000706
Reid Spencer5f016e22007-07-11 17:01:13 +0000707 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
708 // least one declarator'.
709 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
710 // the declarations though. It's trivial to ignore them, really hard to do
711 // anything else with them.
Chris Lattner00073222007-10-09 17:23:58 +0000712 if (Tok.is(tok::semi)) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000713 Diag(DSStart, diag::err_declaration_does_not_declare_param);
714 ConsumeToken();
715 continue;
716 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000717
Reid Spencer5f016e22007-07-11 17:01:13 +0000718 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
719 // than register.
720 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
721 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
722 Diag(DS.getStorageClassSpecLoc(),
723 diag::err_invalid_storage_class_in_func_decl);
724 DS.ClearStorageClassSpecs();
725 }
726 if (DS.isThreadSpecified()) {
727 Diag(DS.getThreadSpecLoc(),
728 diag::err_invalid_storage_class_in_func_decl);
729 DS.ClearStorageClassSpecs();
730 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000731
Reid Spencer5f016e22007-07-11 17:01:13 +0000732 // Parse the first declarator attached to this declspec.
733 Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext);
734 ParseDeclarator(ParmDeclarator);
735
736 // Handle the full declarator list.
737 while (1) {
Chris Lattnerb28317a2009-03-28 19:18:32 +0000738 Action::AttrTy *AttrList;
Reid Spencer5f016e22007-07-11 17:01:13 +0000739 // If attributes are present, parse them.
Chris Lattner00073222007-10-09 17:23:58 +0000740 if (Tok.is(tok::kw___attribute))
Reid Spencer5f016e22007-07-11 17:01:13 +0000741 // FIXME: attach attributes too.
Sean Huntbbd37c62009-11-21 08:43:09 +0000742 AttrList = ParseGNUAttributes();
Mike Stumpa6f01772008-06-19 19:28:49 +0000743
Reid Spencer5f016e22007-07-11 17:01:13 +0000744 // Ask the actions module to compute the type for this declarator.
Chris Lattnerb28317a2009-03-28 19:18:32 +0000745 Action::DeclPtrTy Param =
Chris Lattner04421082008-04-08 04:40:51 +0000746 Actions.ActOnParamDeclarator(CurScope, ParmDeclarator);
Steve Naroff2bd42fa2007-09-10 20:51:04 +0000747
Mike Stumpa6f01772008-06-19 19:28:49 +0000748 if (Param &&
Reid Spencer5f016e22007-07-11 17:01:13 +0000749 // A missing identifier has already been diagnosed.
750 ParmDeclarator.getIdentifier()) {
751
752 // Scan the argument list looking for the correct param to apply this
753 // type.
754 for (unsigned i = 0; ; ++i) {
755 // C99 6.9.1p6: those declarators shall declare only identifiers from
756 // the identifier list.
757 if (i == FTI.NumArgs) {
Chris Lattner1ab3b962008-11-18 07:48:38 +0000758 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
Chris Lattner6898e332008-11-19 07:51:13 +0000759 << ParmDeclarator.getIdentifier();
Reid Spencer5f016e22007-07-11 17:01:13 +0000760 break;
761 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000762
Reid Spencer5f016e22007-07-11 17:01:13 +0000763 if (FTI.ArgInfo[i].Ident == ParmDeclarator.getIdentifier()) {
764 // Reject redefinitions of parameters.
Chris Lattner04421082008-04-08 04:40:51 +0000765 if (FTI.ArgInfo[i].Param) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000766 Diag(ParmDeclarator.getIdentifierLoc(),
Chris Lattner1ab3b962008-11-18 07:48:38 +0000767 diag::err_param_redefinition)
Chris Lattner6898e332008-11-19 07:51:13 +0000768 << ParmDeclarator.getIdentifier();
Reid Spencer5f016e22007-07-11 17:01:13 +0000769 } else {
Chris Lattner04421082008-04-08 04:40:51 +0000770 FTI.ArgInfo[i].Param = Param;
Reid Spencer5f016e22007-07-11 17:01:13 +0000771 }
772 break;
773 }
774 }
775 }
776
777 // If we don't have a comma, it is either the end of the list (a ';') or
778 // an error, bail out.
Chris Lattner00073222007-10-09 17:23:58 +0000779 if (Tok.isNot(tok::comma))
Reid Spencer5f016e22007-07-11 17:01:13 +0000780 break;
Mike Stumpa6f01772008-06-19 19:28:49 +0000781
Reid Spencer5f016e22007-07-11 17:01:13 +0000782 // Consume the comma.
783 ConsumeToken();
Mike Stumpa6f01772008-06-19 19:28:49 +0000784
Reid Spencer5f016e22007-07-11 17:01:13 +0000785 // Parse the next declarator.
786 ParmDeclarator.clear();
787 ParseDeclarator(ParmDeclarator);
788 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000789
Chris Lattner00073222007-10-09 17:23:58 +0000790 if (Tok.is(tok::semi)) {
Reid Spencer5f016e22007-07-11 17:01:13 +0000791 ConsumeToken();
792 } else {
793 Diag(Tok, diag::err_parse_error);
794 // Skip to end of block or statement
795 SkipUntil(tok::semi, true);
Chris Lattner00073222007-10-09 17:23:58 +0000796 if (Tok.is(tok::semi))
Reid Spencer5f016e22007-07-11 17:01:13 +0000797 ConsumeToken();
798 }
799 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000800
Reid Spencer5f016e22007-07-11 17:01:13 +0000801 // The actions module must verify that all arguments were declared.
Douglas Gregora3a83512009-04-01 23:51:29 +0000802 Actions.ActOnFinishKNRParamDeclarations(CurScope, D, Tok.getLocation());
Reid Spencer5f016e22007-07-11 17:01:13 +0000803}
804
805
806/// ParseAsmStringLiteral - This is just a normal string-literal, but is not
807/// allowed to be a wide string, and is not subject to character translation.
808///
809/// [GNU] asm-string-literal:
810/// string-literal
811///
Sebastian Redleffa8d12008-12-10 00:02:53 +0000812Parser::OwningExprResult Parser::ParseAsmStringLiteral() {
Reid Spencer5f016e22007-07-11 17:01:13 +0000813 if (!isTokenStringLiteral()) {
814 Diag(Tok, diag::err_expected_string_literal);
Sebastian Redl61364dd2008-12-11 19:30:53 +0000815 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +0000816 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000817
Sebastian Redl20df9b72008-12-11 22:51:44 +0000818 OwningExprResult Res(ParseStringLiteralExpression());
Sebastian Redleffa8d12008-12-10 00:02:53 +0000819 if (Res.isInvalid()) return move(Res);
Mike Stumpa6f01772008-06-19 19:28:49 +0000820
Reid Spencer5f016e22007-07-11 17:01:13 +0000821 // TODO: Diagnose: wide string literal in 'asm'
Mike Stumpa6f01772008-06-19 19:28:49 +0000822
Sebastian Redleffa8d12008-12-10 00:02:53 +0000823 return move(Res);
Reid Spencer5f016e22007-07-11 17:01:13 +0000824}
825
826/// ParseSimpleAsm
827///
828/// [GNU] simple-asm-expr:
829/// 'asm' '(' asm-string-literal ')'
830///
Sebastian Redlab197ba2009-02-09 18:23:29 +0000831Parser::OwningExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
Chris Lattner00073222007-10-09 17:23:58 +0000832 assert(Tok.is(tok::kw_asm) && "Not an asm!");
Anders Carlssondfab6cb2008-02-08 00:33:21 +0000833 SourceLocation Loc = ConsumeToken();
Mike Stumpa6f01772008-06-19 19:28:49 +0000834
Chris Lattner00073222007-10-09 17:23:58 +0000835 if (Tok.isNot(tok::l_paren)) {
Chris Lattner1ab3b962008-11-18 07:48:38 +0000836 Diag(Tok, diag::err_expected_lparen_after) << "asm";
Sebastian Redl61364dd2008-12-11 19:30:53 +0000837 return ExprError();
Reid Spencer5f016e22007-07-11 17:01:13 +0000838 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000839
Sebastian Redlab197ba2009-02-09 18:23:29 +0000840 Loc = ConsumeParen();
Mike Stumpa6f01772008-06-19 19:28:49 +0000841
Sebastian Redleffa8d12008-12-10 00:02:53 +0000842 OwningExprResult Result(ParseAsmStringLiteral());
Mike Stumpa6f01772008-06-19 19:28:49 +0000843
Sebastian Redlab197ba2009-02-09 18:23:29 +0000844 if (Result.isInvalid()) {
845 SkipUntil(tok::r_paren, true, true);
846 if (EndLoc)
847 *EndLoc = Tok.getLocation();
848 ConsumeAnyToken();
849 } else {
850 Loc = MatchRHSPunctuation(tok::r_paren, Loc);
851 if (EndLoc)
852 *EndLoc = Loc;
853 }
Mike Stumpa6f01772008-06-19 19:28:49 +0000854
Sebastian Redleffa8d12008-12-10 00:02:53 +0000855 return move(Result);
Reid Spencer5f016e22007-07-11 17:01:13 +0000856}
857
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +0000858/// TryAnnotateTypeOrScopeToken - If the current token position is on a
859/// typename (possibly qualified in C++) or a C++ scope specifier not followed
860/// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
861/// with a single annotation token representing the typename or C++ scope
862/// respectively.
863/// This simplifies handling of C++ scope specifiers and allows efficient
864/// backtracking without the need to re-parse and resolve nested-names and
865/// typenames.
Argyrios Kyrtzidis44802cc2008-11-26 21:51:07 +0000866/// It will mainly be called when we expect to treat identifiers as typenames
867/// (if they are typenames). For example, in C we do not expect identifiers
868/// inside expressions to be treated as typenames so it will not be called
869/// for expressions in C.
870/// The benefit for C/ObjC is that a typename will be annotated and
Steve Naroffb43a50f2009-01-28 19:39:02 +0000871/// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
Argyrios Kyrtzidis44802cc2008-11-26 21:51:07 +0000872/// will not be called twice, once to check whether we have a declaration
873/// specifier, and another one to get the actual type inside
874/// ParseDeclarationSpecifiers).
Chris Lattnera7bc7c82009-01-04 23:23:14 +0000875///
Chris Lattnerc8e27cc2009-06-26 04:27:47 +0000876/// This returns true if the token was annotated or an unrecoverable error
877/// occurs.
Mike Stump1eb44332009-09-09 15:08:12 +0000878///
Chris Lattner55a7cef2009-01-05 00:13:00 +0000879/// Note that this routine emits an error if you call it with ::new or ::delete
880/// as the current tokens, so only call it in contexts where these are invalid.
Douglas Gregor495c35d2009-08-25 22:51:20 +0000881bool Parser::TryAnnotateTypeOrScopeToken(bool EnteringContext) {
Mike Stump1eb44332009-09-09 15:08:12 +0000882 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon)
Douglas Gregord57959a2009-03-27 23:10:48 +0000883 || Tok.is(tok::kw_typename)) &&
Chris Lattner7452c6f2009-01-05 01:24:05 +0000884 "Cannot be a type or scope token!");
Mike Stump1eb44332009-09-09 15:08:12 +0000885
Douglas Gregord57959a2009-03-27 23:10:48 +0000886 if (Tok.is(tok::kw_typename)) {
887 // Parse a C++ typename-specifier, e.g., "typename T::type".
888 //
889 // typename-specifier:
890 // 'typename' '::' [opt] nested-name-specifier identifier
Mike Stump1eb44332009-09-09 15:08:12 +0000891 // 'typename' '::' [opt] nested-name-specifier template [opt]
Douglas Gregor17343172009-04-01 00:28:59 +0000892 // simple-template-id
Douglas Gregord57959a2009-03-27 23:10:48 +0000893 SourceLocation TypenameLoc = ConsumeToken();
894 CXXScopeSpec SS;
Mike Stump1eb44332009-09-09 15:08:12 +0000895 bool HadNestedNameSpecifier
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000896 = ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
Douglas Gregord57959a2009-03-27 23:10:48 +0000897 if (!HadNestedNameSpecifier) {
898 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
899 return false;
900 }
901
902 TypeResult Ty;
903 if (Tok.is(tok::identifier)) {
904 // FIXME: check whether the next token is '<', first!
Mike Stump1eb44332009-09-09 15:08:12 +0000905 Ty = Actions.ActOnTypenameType(TypenameLoc, SS, *Tok.getIdentifierInfo(),
Douglas Gregord57959a2009-03-27 23:10:48 +0000906 Tok.getLocation());
Douglas Gregor17343172009-04-01 00:28:59 +0000907 } else if (Tok.is(tok::annot_template_id)) {
Mike Stump1eb44332009-09-09 15:08:12 +0000908 TemplateIdAnnotation *TemplateId
Douglas Gregor17343172009-04-01 00:28:59 +0000909 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
910 if (TemplateId->Kind == TNK_Function_template) {
911 Diag(Tok, diag::err_typename_refers_to_non_type_template)
912 << Tok.getAnnotationRange();
913 return false;
914 }
Douglas Gregord57959a2009-03-27 23:10:48 +0000915
Douglas Gregor31a19b62009-04-01 21:51:26 +0000916 AnnotateTemplateIdTokenAsType(0);
Mike Stump1eb44332009-09-09 15:08:12 +0000917 assert(Tok.is(tok::annot_typename) &&
Douglas Gregor17343172009-04-01 00:28:59 +0000918 "AnnotateTemplateIdTokenAsType isn't working properly");
Douglas Gregor31a19b62009-04-01 21:51:26 +0000919 if (Tok.getAnnotationValue())
920 Ty = Actions.ActOnTypenameType(TypenameLoc, SS, SourceLocation(),
921 Tok.getAnnotationValue());
922 else
923 Ty = true;
Douglas Gregor17343172009-04-01 00:28:59 +0000924 } else {
925 Diag(Tok, diag::err_expected_type_name_after_typename)
926 << SS.getRange();
927 return false;
928 }
929
Douglas Gregor17343172009-04-01 00:28:59 +0000930 Tok.setKind(tok::annot_typename);
Douglas Gregor31a19b62009-04-01 21:51:26 +0000931 Tok.setAnnotationValue(Ty.isInvalid()? 0 : Ty.get());
Douglas Gregor17343172009-04-01 00:28:59 +0000932 Tok.setAnnotationEndLoc(Tok.getLocation());
933 Tok.setLocation(TypenameLoc);
934 PP.AnnotateCachedTokens(Tok);
935 return true;
Douglas Gregord57959a2009-03-27 23:10:48 +0000936 }
937
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +0000938 CXXScopeSpec SS;
Argyrios Kyrtzidis4bdd91c2008-11-26 21:41:52 +0000939 if (getLang().CPlusPlus)
Douglas Gregor2dd078a2009-09-02 22:59:36 +0000940 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, EnteringContext);
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +0000941
942 if (Tok.is(tok::identifier)) {
Chris Lattner608d1fc2009-01-05 01:49:50 +0000943 // Determine whether the identifier is a type name.
Mike Stump1eb44332009-09-09 15:08:12 +0000944 if (TypeTy *Ty = Actions.getTypeName(*Tok.getIdentifierInfo(),
Douglas Gregorb696ea32009-02-04 17:00:24 +0000945 Tok.getLocation(), CurScope, &SS)) {
Chris Lattner608d1fc2009-01-05 01:49:50 +0000946 // This is a typename. Replace the current token in-place with an
947 // annotation type token.
Chris Lattnerb31757b2009-01-06 05:06:21 +0000948 Tok.setKind(tok::annot_typename);
Chris Lattner608d1fc2009-01-05 01:49:50 +0000949 Tok.setAnnotationValue(Ty);
950 Tok.setAnnotationEndLoc(Tok.getLocation());
951 if (SS.isNotEmpty()) // it was a C++ qualified type name.
952 Tok.setLocation(SS.getBeginLoc());
Mike Stump1eb44332009-09-09 15:08:12 +0000953
Chris Lattner608d1fc2009-01-05 01:49:50 +0000954 // In case the tokens were cached, have Preprocessor replace
955 // them with the annotation token.
956 PP.AnnotateCachedTokens(Tok);
957 return true;
Mike Stump1eb44332009-09-09 15:08:12 +0000958 }
Douglas Gregor39a8de12009-02-25 19:37:18 +0000959
960 if (!getLang().CPlusPlus) {
Chris Lattner608d1fc2009-01-05 01:49:50 +0000961 // If we're in C, we can't have :: tokens at all (the lexer won't return
962 // them). If the identifier is not a type, then it can't be scope either,
Mike Stump1eb44332009-09-09 15:08:12 +0000963 // just early exit.
Chris Lattner608d1fc2009-01-05 01:49:50 +0000964 return false;
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +0000965 }
Mike Stump1eb44332009-09-09 15:08:12 +0000966
Douglas Gregor39a8de12009-02-25 19:37:18 +0000967 // If this is a template-id, annotate with a template-id or type token.
Douglas Gregor55f6b142009-02-09 18:46:07 +0000968 if (NextToken().is(tok::less)) {
Douglas Gregor7532dc62009-03-30 22:58:21 +0000969 TemplateTy Template;
Douglas Gregor014e88d2009-11-03 23:16:33 +0000970 UnqualifiedId TemplateName;
971 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
Mike Stump1eb44332009-09-09 15:08:12 +0000972 if (TemplateNameKind TNK
Douglas Gregor014e88d2009-11-03 23:16:33 +0000973 = Actions.isTemplateName(CurScope, SS, TemplateName,
Mike Stump1eb44332009-09-09 15:08:12 +0000974 /*ObjectType=*/0, EnteringContext,
Douglas Gregorca1bdd72009-11-04 00:56:37 +0000975 Template)) {
976 // Consume the identifier.
977 ConsumeToken();
978 if (AnnotateTemplateIdToken(Template, TNK, &SS, TemplateName)) {
Chris Lattnerc8e27cc2009-06-26 04:27:47 +0000979 // If an unrecoverable error occurred, we need to return true here,
980 // because the token stream is in a damaged state. We may not return
981 // a valid identifier.
982 return Tok.isNot(tok::identifier);
983 }
Douglas Gregorca1bdd72009-11-04 00:56:37 +0000984 }
Douglas Gregor55f6b142009-02-09 18:46:07 +0000985 }
Douglas Gregord6fb7ef2008-12-18 19:37:40 +0000986
Douglas Gregor39a8de12009-02-25 19:37:18 +0000987 // The current token, which is either an identifier or a
988 // template-id, is not part of the annotation. Fall through to
989 // push that token back into the stream and complete the C++ scope
990 // specifier annotation.
Mike Stump1eb44332009-09-09 15:08:12 +0000991 }
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +0000992
Douglas Gregor39a8de12009-02-25 19:37:18 +0000993 if (Tok.is(tok::annot_template_id)) {
Mike Stump1eb44332009-09-09 15:08:12 +0000994 TemplateIdAnnotation *TemplateId
Douglas Gregor39a8de12009-02-25 19:37:18 +0000995 = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
Douglas Gregorc45c2322009-03-31 00:43:58 +0000996 if (TemplateId->Kind == TNK_Type_template) {
Douglas Gregor39a8de12009-02-25 19:37:18 +0000997 // A template-id that refers to a type was parsed into a
998 // template-id annotation in a context where we weren't allowed
999 // to produce a type annotation token. Update the template-id
1000 // annotation token to a type annotation token now.
Douglas Gregor31a19b62009-04-01 21:51:26 +00001001 AnnotateTemplateIdTokenAsType(&SS);
1002 return true;
Douglas Gregor39a8de12009-02-25 19:37:18 +00001003 }
1004 }
Douglas Gregord6fb7ef2008-12-18 19:37:40 +00001005
Chris Lattner6ec76d42009-01-04 22:32:19 +00001006 if (SS.isEmpty())
Eli Friedman3c9028a2009-06-27 08:17:02 +00001007 return Tok.isNot(tok::identifier) && Tok.isNot(tok::coloncolon);
Mike Stump1eb44332009-09-09 15:08:12 +00001008
Chris Lattner6ec76d42009-01-04 22:32:19 +00001009 // A C++ scope specifier that isn't followed by a typename.
1010 // Push the current token back into the token stream (or revert it if it is
1011 // cached) and use an annotation scope token for current token.
1012 if (PP.isBacktrackEnabled())
1013 PP.RevertCachedTokens(1);
1014 else
1015 PP.EnterToken(Tok);
1016 Tok.setKind(tok::annot_cxxscope);
Douglas Gregor35073692009-03-26 23:56:24 +00001017 Tok.setAnnotationValue(SS.getScopeRep());
Chris Lattner6ec76d42009-01-04 22:32:19 +00001018 Tok.setAnnotationRange(SS.getRange());
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +00001019
Chris Lattner6ec76d42009-01-04 22:32:19 +00001020 // In case the tokens were cached, have Preprocessor replace them with the
1021 // annotation token.
1022 PP.AnnotateCachedTokens(Tok);
Chris Lattnera7bc7c82009-01-04 23:23:14 +00001023 return true;
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +00001024}
1025
1026/// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
Douglas Gregor39a8de12009-02-25 19:37:18 +00001027/// annotates C++ scope specifiers and template-ids. This returns
Chris Lattnerc8e27cc2009-06-26 04:27:47 +00001028/// true if the token was annotated or there was an error that could not be
1029/// recovered from.
Mike Stump1eb44332009-09-09 15:08:12 +00001030///
Chris Lattner55a7cef2009-01-05 00:13:00 +00001031/// Note that this routine emits an error if you call it with ::new or ::delete
1032/// as the current tokens, so only call it in contexts where these are invalid.
Douglas Gregor495c35d2009-08-25 22:51:20 +00001033bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
Argyrios Kyrtzidis4bdd91c2008-11-26 21:41:52 +00001034 assert(getLang().CPlusPlus &&
Chris Lattner6ec76d42009-01-04 22:32:19 +00001035 "Call sites of this function should be guarded by checking for C++");
Chris Lattner7452c6f2009-01-05 01:24:05 +00001036 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
1037 "Cannot be a type or scope token!");
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +00001038
Argyrios Kyrtzidis4bdd91c2008-11-26 21:41:52 +00001039 CXXScopeSpec SS;
Douglas Gregor2dd078a2009-09-02 22:59:36 +00001040 if (!ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, EnteringContext))
Chris Lattnerbd87c0b2009-12-07 00:48:47 +00001041 // If the token left behind is not an identifier, we either had an error or
1042 // successfully turned it into an annotation token.
1043 return Tok.isNot(tok::identifier);
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +00001044
Chris Lattner6ec76d42009-01-04 22:32:19 +00001045 // Push the current token back into the token stream (or revert it if it is
1046 // cached) and use an annotation scope token for current token.
1047 if (PP.isBacktrackEnabled())
1048 PP.RevertCachedTokens(1);
1049 else
1050 PP.EnterToken(Tok);
1051 Tok.setKind(tok::annot_cxxscope);
Douglas Gregor35073692009-03-26 23:56:24 +00001052 Tok.setAnnotationValue(SS.getScopeRep());
Chris Lattner6ec76d42009-01-04 22:32:19 +00001053 Tok.setAnnotationRange(SS.getRange());
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +00001054
Chris Lattner6ec76d42009-01-04 22:32:19 +00001055 // In case the tokens were cached, have Preprocessor replace them with the
1056 // annotation token.
1057 PP.AnnotateCachedTokens(Tok);
Chris Lattner5e02c472009-01-05 00:07:25 +00001058 return true;
Argyrios Kyrtzidiseb83ecd2008-11-08 16:45:02 +00001059}
John McCall6c94a6d2009-11-03 19:33:12 +00001060
1061// Anchor the Parser::FieldCallback vtable to this translation unit.
1062// We use a spurious method instead of the destructor because
1063// destroying FieldCallbacks can actually be slightly
1064// performance-sensitive.
1065void Parser::FieldCallback::_anchor() {
1066}