forked from OSchip/llvm-project
1161 lines
41 KiB
C++
1161 lines
41 KiB
C++
//===--- Parser.cpp - C Language Family Parser ----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Parser interfaces.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Parse/Parser.h"
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#include "clang/Parse/ParseDiagnostic.h"
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#include "clang/Sema/DeclSpec.h"
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#include "clang/Sema/Scope.h"
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#include "clang/Sema/ParsedTemplate.h"
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#include "llvm/Support/raw_ostream.h"
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#include "RAIIObjectsForParser.h"
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#include "ParsePragma.h"
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using namespace clang;
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Parser::Parser(Preprocessor &pp, Sema &actions)
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: CrashInfo(*this), PP(pp), Actions(actions), Diags(PP.getDiagnostics()),
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GreaterThanIsOperator(true), ColonIsSacred(false),
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TemplateParameterDepth(0) {
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Tok.setKind(tok::eof);
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Actions.CurScope = 0;
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NumCachedScopes = 0;
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ParenCount = BracketCount = BraceCount = 0;
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ObjCImpDecl = 0;
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// Add #pragma handlers. These are removed and destroyed in the
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// destructor.
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AlignHandler.reset(new PragmaAlignHandler(actions));
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PP.AddPragmaHandler(AlignHandler.get());
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GCCVisibilityHandler.reset(new PragmaGCCVisibilityHandler(actions));
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PP.AddPragmaHandler("GCC", GCCVisibilityHandler.get());
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OptionsHandler.reset(new PragmaOptionsHandler(actions));
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PP.AddPragmaHandler(OptionsHandler.get());
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PackHandler.reset(new PragmaPackHandler(actions));
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PP.AddPragmaHandler(PackHandler.get());
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UnusedHandler.reset(new PragmaUnusedHandler(actions, *this));
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PP.AddPragmaHandler(UnusedHandler.get());
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WeakHandler.reset(new PragmaWeakHandler(actions));
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PP.AddPragmaHandler(WeakHandler.get());
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PP.setCodeCompletionHandler(*this);
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}
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/// If a crash happens while the parser is active, print out a line indicating
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/// what the current token is.
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void PrettyStackTraceParserEntry::print(llvm::raw_ostream &OS) const {
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const Token &Tok = P.getCurToken();
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if (Tok.is(tok::eof)) {
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OS << "<eof> parser at end of file\n";
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return;
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}
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if (Tok.getLocation().isInvalid()) {
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OS << "<unknown> parser at unknown location\n";
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return;
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}
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const Preprocessor &PP = P.getPreprocessor();
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Tok.getLocation().print(OS, PP.getSourceManager());
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if (Tok.isAnnotation())
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OS << ": at annotation token \n";
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else
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OS << ": current parser token '" << PP.getSpelling(Tok) << "'\n";
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}
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DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) {
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return Diags.Report(FullSourceLoc(Loc, PP.getSourceManager()), DiagID);
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}
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DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) {
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return Diag(Tok.getLocation(), DiagID);
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}
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/// \brief Emits a diagnostic suggesting parentheses surrounding a
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/// given range.
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///
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/// \param Loc The location where we'll emit the diagnostic.
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/// \param Loc The kind of diagnostic to emit.
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/// \param ParenRange Source range enclosing code that should be parenthesized.
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void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK,
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SourceRange ParenRange) {
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SourceLocation EndLoc = PP.getLocForEndOfToken(ParenRange.getEnd());
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if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
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// We can't display the parentheses, so just dig the
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// warning/error and return.
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Diag(Loc, DK);
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return;
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}
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Diag(Loc, DK)
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<< FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
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<< FixItHint::CreateInsertion(EndLoc, ")");
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}
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/// MatchRHSPunctuation - For punctuation with a LHS and RHS (e.g. '['/']'),
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/// this helper function matches and consumes the specified RHS token if
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/// present. If not present, it emits the specified diagnostic indicating
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/// that the parser failed to match the RHS of the token at LHSLoc. LHSName
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/// should be the name of the unmatched LHS token.
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SourceLocation Parser::MatchRHSPunctuation(tok::TokenKind RHSTok,
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SourceLocation LHSLoc) {
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if (Tok.is(RHSTok))
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return ConsumeAnyToken();
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SourceLocation R = Tok.getLocation();
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const char *LHSName = "unknown";
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diag::kind DID = diag::err_parse_error;
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switch (RHSTok) {
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default: break;
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case tok::r_paren : LHSName = "("; DID = diag::err_expected_rparen; break;
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case tok::r_brace : LHSName = "{"; DID = diag::err_expected_rbrace; break;
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case tok::r_square: LHSName = "["; DID = diag::err_expected_rsquare; break;
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case tok::greater: LHSName = "<"; DID = diag::err_expected_greater; break;
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}
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Diag(Tok, DID);
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Diag(LHSLoc, diag::note_matching) << LHSName;
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SkipUntil(RHSTok);
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return R;
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}
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/// ExpectAndConsume - The parser expects that 'ExpectedTok' is next in the
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/// input. If so, it is consumed and false is returned.
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///
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/// If the input is malformed, this emits the specified diagnostic. Next, if
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/// SkipToTok is specified, it calls SkipUntil(SkipToTok). Finally, true is
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/// returned.
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bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID,
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const char *Msg, tok::TokenKind SkipToTok) {
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if (Tok.is(ExpectedTok) || Tok.is(tok::code_completion)) {
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ConsumeAnyToken();
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return false;
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}
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const char *Spelling = 0;
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SourceLocation EndLoc = PP.getLocForEndOfToken(PrevTokLocation);
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if (EndLoc.isValid() &&
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(Spelling = tok::getTokenSimpleSpelling(ExpectedTok))) {
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// Show what code to insert to fix this problem.
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Diag(EndLoc, DiagID)
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<< Msg
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<< FixItHint::CreateInsertion(EndLoc, Spelling);
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} else
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Diag(Tok, DiagID) << Msg;
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if (SkipToTok != tok::unknown)
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SkipUntil(SkipToTok);
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return true;
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}
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//===----------------------------------------------------------------------===//
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// Error recovery.
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//===----------------------------------------------------------------------===//
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/// SkipUntil - Read tokens until we get to the specified token, then consume
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/// it (unless DontConsume is true). Because we cannot guarantee that the
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/// token will ever occur, this skips to the next token, or to some likely
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/// good stopping point. If StopAtSemi is true, skipping will stop at a ';'
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/// character.
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///
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/// If SkipUntil finds the specified token, it returns true, otherwise it
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/// returns false.
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bool Parser::SkipUntil(const tok::TokenKind *Toks, unsigned NumToks,
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bool StopAtSemi, bool DontConsume) {
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// We always want this function to skip at least one token if the first token
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// isn't T and if not at EOF.
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bool isFirstTokenSkipped = true;
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while (1) {
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// If we found one of the tokens, stop and return true.
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for (unsigned i = 0; i != NumToks; ++i) {
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if (Tok.is(Toks[i])) {
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if (DontConsume) {
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// Noop, don't consume the token.
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} else {
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ConsumeAnyToken();
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}
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return true;
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}
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}
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switch (Tok.getKind()) {
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case tok::eof:
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// Ran out of tokens.
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return false;
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case tok::code_completion:
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ConsumeToken();
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return false;
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case tok::l_paren:
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// Recursively skip properly-nested parens.
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ConsumeParen();
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SkipUntil(tok::r_paren, false);
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break;
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case tok::l_square:
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// Recursively skip properly-nested square brackets.
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ConsumeBracket();
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SkipUntil(tok::r_square, false);
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break;
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case tok::l_brace:
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// Recursively skip properly-nested braces.
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ConsumeBrace();
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SkipUntil(tok::r_brace, false);
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break;
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// Okay, we found a ']' or '}' or ')', which we think should be balanced.
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// Since the user wasn't looking for this token (if they were, it would
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// already be handled), this isn't balanced. If there is a LHS token at a
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// higher level, we will assume that this matches the unbalanced token
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// and return it. Otherwise, this is a spurious RHS token, which we skip.
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case tok::r_paren:
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if (ParenCount && !isFirstTokenSkipped)
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return false; // Matches something.
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ConsumeParen();
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break;
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case tok::r_square:
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if (BracketCount && !isFirstTokenSkipped)
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return false; // Matches something.
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ConsumeBracket();
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break;
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case tok::r_brace:
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if (BraceCount && !isFirstTokenSkipped)
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return false; // Matches something.
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ConsumeBrace();
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break;
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case tok::string_literal:
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case tok::wide_string_literal:
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ConsumeStringToken();
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break;
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case tok::semi:
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if (StopAtSemi)
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return false;
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// FALL THROUGH.
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default:
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// Skip this token.
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ConsumeToken();
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break;
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}
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isFirstTokenSkipped = false;
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}
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}
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//===----------------------------------------------------------------------===//
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// Scope manipulation
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//===----------------------------------------------------------------------===//
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/// EnterScope - Start a new scope.
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void Parser::EnterScope(unsigned ScopeFlags) {
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if (NumCachedScopes) {
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Scope *N = ScopeCache[--NumCachedScopes];
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N->Init(getCurScope(), ScopeFlags);
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Actions.CurScope = N;
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} else {
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Actions.CurScope = new Scope(getCurScope(), ScopeFlags);
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}
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getCurScope()->setNumErrorsAtStart(Diags.getNumErrors());
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}
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/// ExitScope - Pop a scope off the scope stack.
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void Parser::ExitScope() {
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assert(getCurScope() && "Scope imbalance!");
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// Inform the actions module that this scope is going away if there are any
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// decls in it.
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if (!getCurScope()->decl_empty())
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Actions.ActOnPopScope(Tok.getLocation(), getCurScope());
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Scope *OldScope = getCurScope();
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Actions.CurScope = OldScope->getParent();
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if (NumCachedScopes == ScopeCacheSize)
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delete OldScope;
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else
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ScopeCache[NumCachedScopes++] = OldScope;
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}
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//===----------------------------------------------------------------------===//
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// C99 6.9: External Definitions.
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//===----------------------------------------------------------------------===//
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Parser::~Parser() {
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// If we still have scopes active, delete the scope tree.
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delete getCurScope();
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Actions.CurScope = 0;
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// Free the scope cache.
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for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
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delete ScopeCache[i];
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// Remove the pragma handlers we installed.
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PP.RemovePragmaHandler(AlignHandler.get());
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AlignHandler.reset();
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PP.RemovePragmaHandler("GCC", GCCVisibilityHandler.get());
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GCCVisibilityHandler.reset();
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PP.RemovePragmaHandler(OptionsHandler.get());
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OptionsHandler.reset();
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PP.RemovePragmaHandler(PackHandler.get());
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PackHandler.reset();
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PP.RemovePragmaHandler(UnusedHandler.get());
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UnusedHandler.reset();
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PP.RemovePragmaHandler(WeakHandler.get());
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WeakHandler.reset();
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PP.clearCodeCompletionHandler();
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}
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/// Initialize - Warm up the parser.
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///
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void Parser::Initialize() {
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// Create the translation unit scope. Install it as the current scope.
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assert(getCurScope() == 0 && "A scope is already active?");
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EnterScope(Scope::DeclScope);
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Actions.ActOnTranslationUnitScope(getCurScope());
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// Prime the lexer look-ahead.
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ConsumeToken();
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if (Tok.is(tok::eof) &&
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!getLang().CPlusPlus) // Empty source file is an extension in C
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Diag(Tok, diag::ext_empty_source_file);
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// Initialization for Objective-C context sensitive keywords recognition.
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// Referenced in Parser::ParseObjCTypeQualifierList.
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if (getLang().ObjC1) {
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ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
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ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
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ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
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ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
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ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
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ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
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}
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Ident_super = &PP.getIdentifierTable().get("super");
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if (getLang().AltiVec) {
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Ident_vector = &PP.getIdentifierTable().get("vector");
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Ident_pixel = &PP.getIdentifierTable().get("pixel");
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}
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}
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/// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
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/// action tells us to. This returns true if the EOF was encountered.
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bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
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Result = DeclGroupPtrTy();
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if (Tok.is(tok::eof)) {
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Actions.ActOnEndOfTranslationUnit();
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return true;
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}
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CXX0XAttributeList Attr;
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if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
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Attr = ParseCXX0XAttributes();
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Result = ParseExternalDeclaration(Attr);
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return false;
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}
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/// ParseTranslationUnit:
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/// translation-unit: [C99 6.9]
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/// external-declaration
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/// translation-unit external-declaration
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void Parser::ParseTranslationUnit() {
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Initialize();
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DeclGroupPtrTy Res;
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while (!ParseTopLevelDecl(Res))
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/*parse them all*/;
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ExitScope();
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assert(getCurScope() == 0 && "Scope imbalance!");
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}
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/// ParseExternalDeclaration:
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///
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/// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
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/// function-definition
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/// declaration
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/// [C++0x] empty-declaration
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/// [GNU] asm-definition
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/// [GNU] __extension__ external-declaration
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/// [OBJC] objc-class-definition
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/// [OBJC] objc-class-declaration
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/// [OBJC] objc-alias-declaration
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/// [OBJC] objc-protocol-definition
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/// [OBJC] objc-method-definition
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/// [OBJC] @end
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/// [C++] linkage-specification
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/// [GNU] asm-definition:
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/// simple-asm-expr ';'
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///
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/// [C++0x] empty-declaration:
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/// ';'
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///
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/// [C++0x/GNU] 'extern' 'template' declaration
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Parser::DeclGroupPtrTy Parser::ParseExternalDeclaration(CXX0XAttributeList Attr,
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ParsingDeclSpec *DS) {
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ParenBraceBracketBalancer BalancerRAIIObj(*this);
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Decl *SingleDecl = 0;
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switch (Tok.getKind()) {
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case tok::semi:
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if (!getLang().CPlusPlus0x)
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Diag(Tok, diag::ext_top_level_semi)
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<< FixItHint::CreateRemoval(Tok.getLocation());
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ConsumeToken();
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// TODO: Invoke action for top-level semicolon.
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return DeclGroupPtrTy();
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case tok::r_brace:
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Diag(Tok, diag::err_expected_external_declaration);
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ConsumeBrace();
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return DeclGroupPtrTy();
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case tok::eof:
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Diag(Tok, diag::err_expected_external_declaration);
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return DeclGroupPtrTy();
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case tok::kw___extension__: {
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// __extension__ silences extension warnings in the subexpression.
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ExtensionRAIIObject O(Diags); // Use RAII to do this.
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ConsumeToken();
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return ParseExternalDeclaration(Attr);
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}
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case tok::kw_asm: {
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if (Attr.HasAttr)
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Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
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<< Attr.Range;
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ExprResult Result(ParseSimpleAsm());
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ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
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"top-level asm block");
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if (Result.isInvalid())
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return DeclGroupPtrTy();
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SingleDecl = Actions.ActOnFileScopeAsmDecl(Tok.getLocation(), Result.get());
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break;
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}
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case tok::at:
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// @ is not a legal token unless objc is enabled, no need to check for ObjC.
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/// FIXME: ParseObjCAtDirectives should return a DeclGroup for things like
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/// @class foo, bar;
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SingleDecl = ParseObjCAtDirectives();
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break;
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case tok::minus:
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case tok::plus:
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if (!getLang().ObjC1) {
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Diag(Tok, diag::err_expected_external_declaration);
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ConsumeToken();
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return DeclGroupPtrTy();
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}
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SingleDecl = ParseObjCMethodDefinition();
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break;
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case tok::code_completion:
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Actions.CodeCompleteOrdinaryName(getCurScope(),
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ObjCImpDecl? Sema::PCC_ObjCImplementation
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: Sema::PCC_Namespace);
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ConsumeCodeCompletionToken();
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return ParseExternalDeclaration(Attr);
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case tok::kw_using:
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case tok::kw_namespace:
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case tok::kw_typedef:
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case tok::kw_template:
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case tok::kw_export: // As in 'export template'
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case tok::kw_static_assert:
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// A function definition cannot start with a these keywords.
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{
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SourceLocation DeclEnd;
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return ParseDeclaration(Declarator::FileContext, DeclEnd, Attr);
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}
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case tok::kw_extern:
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if (getLang().CPlusPlus && NextToken().is(tok::kw_template)) {
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// Extern templates
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SourceLocation ExternLoc = ConsumeToken();
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SourceLocation TemplateLoc = ConsumeToken();
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SourceLocation DeclEnd;
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return Actions.ConvertDeclToDeclGroup(
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ParseExplicitInstantiation(ExternLoc, TemplateLoc, DeclEnd));
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}
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// FIXME: Detect C++ linkage specifications here?
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// Fall through to handle other declarations or function definitions.
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default:
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// We can't tell whether this is a function-definition or declaration yet.
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if (DS)
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return ParseDeclarationOrFunctionDefinition(*DS, Attr.AttrList);
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else
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return ParseDeclarationOrFunctionDefinition(Attr.AttrList);
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}
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// This routine returns a DeclGroup, if the thing we parsed only contains a
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// single decl, convert it now.
|
|
return Actions.ConvertDeclToDeclGroup(SingleDecl);
|
|
}
|
|
|
|
/// \brief Determine whether the current token, if it occurs after a
|
|
/// declarator, continues a declaration or declaration list.
|
|
bool Parser::isDeclarationAfterDeclarator() const {
|
|
return Tok.is(tok::equal) || // int X()= -> not a function def
|
|
Tok.is(tok::comma) || // int X(), -> not a function def
|
|
Tok.is(tok::semi) || // int X(); -> not a function def
|
|
Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
|
|
Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
|
|
(getLang().CPlusPlus &&
|
|
Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
|
|
}
|
|
|
|
/// \brief Determine whether the current token, if it occurs after a
|
|
/// declarator, indicates the start of a function definition.
|
|
bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
|
|
assert(Declarator.getTypeObject(0).Kind == DeclaratorChunk::Function &&
|
|
"Isn't a function declarator");
|
|
if (Tok.is(tok::l_brace)) // int X() {}
|
|
return true;
|
|
|
|
// Handle K&R C argument lists: int X(f) int f; {}
|
|
if (!getLang().CPlusPlus &&
|
|
Declarator.getTypeObject(0).Fun.isKNRPrototype())
|
|
return isDeclarationSpecifier();
|
|
|
|
return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
|
|
Tok.is(tok::kw_try); // X() try { ... }
|
|
}
|
|
|
|
/// ParseDeclarationOrFunctionDefinition - Parse either a function-definition or
|
|
/// a declaration. We can't tell which we have until we read up to the
|
|
/// compound-statement in function-definition. TemplateParams, if
|
|
/// non-NULL, provides the template parameters when we're parsing a
|
|
/// C++ template-declaration.
|
|
///
|
|
/// function-definition: [C99 6.9.1]
|
|
/// decl-specs declarator declaration-list[opt] compound-statement
|
|
/// [C90] function-definition: [C99 6.7.1] - implicit int result
|
|
/// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
|
|
///
|
|
/// declaration: [C99 6.7]
|
|
/// declaration-specifiers init-declarator-list[opt] ';'
|
|
/// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
|
|
/// [OMP] threadprivate-directive [TODO]
|
|
///
|
|
Parser::DeclGroupPtrTy
|
|
Parser::ParseDeclarationOrFunctionDefinition(ParsingDeclSpec &DS,
|
|
AttributeList *Attr,
|
|
AccessSpecifier AS) {
|
|
// Parse the common declaration-specifiers piece.
|
|
if (Attr)
|
|
DS.AddAttributes(Attr);
|
|
|
|
ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC_top_level);
|
|
|
|
// C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
|
|
// declaration-specifiers init-declarator-list[opt] ';'
|
|
if (Tok.is(tok::semi)) {
|
|
ConsumeToken();
|
|
Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS, DS);
|
|
DS.complete(TheDecl);
|
|
return Actions.ConvertDeclToDeclGroup(TheDecl);
|
|
}
|
|
|
|
// ObjC2 allows prefix attributes on class interfaces and protocols.
|
|
// FIXME: This still needs better diagnostics. We should only accept
|
|
// attributes here, no types, etc.
|
|
if (getLang().ObjC2 && Tok.is(tok::at)) {
|
|
SourceLocation AtLoc = ConsumeToken(); // the "@"
|
|
if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
|
|
!Tok.isObjCAtKeyword(tok::objc_protocol)) {
|
|
Diag(Tok, diag::err_objc_unexpected_attr);
|
|
SkipUntil(tok::semi); // FIXME: better skip?
|
|
return DeclGroupPtrTy();
|
|
}
|
|
|
|
DS.abort();
|
|
|
|
const char *PrevSpec = 0;
|
|
unsigned DiagID;
|
|
if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID))
|
|
Diag(AtLoc, DiagID) << PrevSpec;
|
|
|
|
Decl *TheDecl = 0;
|
|
if (Tok.isObjCAtKeyword(tok::objc_protocol))
|
|
TheDecl = ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
|
|
else
|
|
TheDecl = ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes());
|
|
return Actions.ConvertDeclToDeclGroup(TheDecl);
|
|
}
|
|
|
|
// If the declspec consisted only of 'extern' and we have a string
|
|
// literal following it, this must be a C++ linkage specifier like
|
|
// 'extern "C"'.
|
|
if (Tok.is(tok::string_literal) && getLang().CPlusPlus &&
|
|
DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
|
|
DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
|
|
Decl *TheDecl = ParseLinkage(DS, Declarator::FileContext);
|
|
return Actions.ConvertDeclToDeclGroup(TheDecl);
|
|
}
|
|
|
|
return ParseDeclGroup(DS, Declarator::FileContext, true);
|
|
}
|
|
|
|
Parser::DeclGroupPtrTy
|
|
Parser::ParseDeclarationOrFunctionDefinition(AttributeList *Attr,
|
|
AccessSpecifier AS) {
|
|
ParsingDeclSpec DS(*this);
|
|
return ParseDeclarationOrFunctionDefinition(DS, Attr, AS);
|
|
}
|
|
|
|
/// ParseFunctionDefinition - We parsed and verified that the specified
|
|
/// Declarator is well formed. If this is a K&R-style function, read the
|
|
/// parameters declaration-list, then start the compound-statement.
|
|
///
|
|
/// function-definition: [C99 6.9.1]
|
|
/// decl-specs declarator declaration-list[opt] compound-statement
|
|
/// [C90] function-definition: [C99 6.7.1] - implicit int result
|
|
/// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
|
|
/// [C++] function-definition: [C++ 8.4]
|
|
/// decl-specifier-seq[opt] declarator ctor-initializer[opt]
|
|
/// function-body
|
|
/// [C++] function-definition: [C++ 8.4]
|
|
/// decl-specifier-seq[opt] declarator function-try-block
|
|
///
|
|
Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
|
|
const ParsedTemplateInfo &TemplateInfo) {
|
|
const DeclaratorChunk &FnTypeInfo = D.getTypeObject(0);
|
|
assert(FnTypeInfo.Kind == DeclaratorChunk::Function &&
|
|
"This isn't a function declarator!");
|
|
const DeclaratorChunk::FunctionTypeInfo &FTI = FnTypeInfo.Fun;
|
|
|
|
// If this is C90 and the declspecs were completely missing, fudge in an
|
|
// implicit int. We do this here because this is the only place where
|
|
// declaration-specifiers are completely optional in the grammar.
|
|
if (getLang().ImplicitInt && D.getDeclSpec().isEmpty()) {
|
|
const char *PrevSpec;
|
|
unsigned DiagID;
|
|
D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
|
|
D.getIdentifierLoc(),
|
|
PrevSpec, DiagID);
|
|
D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
|
|
}
|
|
|
|
// If this declaration was formed with a K&R-style identifier list for the
|
|
// arguments, parse declarations for all of the args next.
|
|
// int foo(a,b) int a; float b; {}
|
|
if (FTI.isKNRPrototype())
|
|
ParseKNRParamDeclarations(D);
|
|
|
|
// We should have either an opening brace or, in a C++ constructor,
|
|
// we may have a colon.
|
|
if (Tok.isNot(tok::l_brace) && Tok.isNot(tok::colon) &&
|
|
Tok.isNot(tok::kw_try)) {
|
|
Diag(Tok, diag::err_expected_fn_body);
|
|
|
|
// Skip over garbage, until we get to '{'. Don't eat the '{'.
|
|
SkipUntil(tok::l_brace, true, true);
|
|
|
|
// If we didn't find the '{', bail out.
|
|
if (Tok.isNot(tok::l_brace))
|
|
return 0;
|
|
}
|
|
|
|
// Enter a scope for the function body.
|
|
ParseScope BodyScope(this, Scope::FnScope|Scope::DeclScope);
|
|
|
|
// Tell the actions module that we have entered a function definition with the
|
|
// specified Declarator for the function.
|
|
Decl *Res = TemplateInfo.TemplateParams?
|
|
Actions.ActOnStartOfFunctionTemplateDef(getCurScope(),
|
|
MultiTemplateParamsArg(Actions,
|
|
TemplateInfo.TemplateParams->data(),
|
|
TemplateInfo.TemplateParams->size()),
|
|
D)
|
|
: Actions.ActOnStartOfFunctionDef(getCurScope(), D);
|
|
|
|
// Break out of the ParsingDeclarator context before we parse the body.
|
|
D.complete(Res);
|
|
|
|
// Break out of the ParsingDeclSpec context, too. This const_cast is
|
|
// safe because we're always the sole owner.
|
|
D.getMutableDeclSpec().abort();
|
|
|
|
if (Tok.is(tok::kw_try))
|
|
return ParseFunctionTryBlock(Res);
|
|
|
|
// If we have a colon, then we're probably parsing a C++
|
|
// ctor-initializer.
|
|
if (Tok.is(tok::colon)) {
|
|
ParseConstructorInitializer(Res);
|
|
|
|
// Recover from error.
|
|
if (!Tok.is(tok::l_brace)) {
|
|
Actions.ActOnFinishFunctionBody(Res, 0);
|
|
return Res;
|
|
}
|
|
} else
|
|
Actions.ActOnDefaultCtorInitializers(Res);
|
|
|
|
return ParseFunctionStatementBody(Res);
|
|
}
|
|
|
|
/// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
|
|
/// types for a function with a K&R-style identifier list for arguments.
|
|
void Parser::ParseKNRParamDeclarations(Declarator &D) {
|
|
// We know that the top-level of this declarator is a function.
|
|
DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
|
|
|
|
// Enter function-declaration scope, limiting any declarators to the
|
|
// function prototype scope, including parameter declarators.
|
|
ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope|Scope::DeclScope);
|
|
|
|
// Read all the argument declarations.
|
|
while (isDeclarationSpecifier()) {
|
|
SourceLocation DSStart = Tok.getLocation();
|
|
|
|
// Parse the common declaration-specifiers piece.
|
|
DeclSpec DS;
|
|
ParseDeclarationSpecifiers(DS);
|
|
|
|
// C99 6.9.1p6: 'each declaration in the declaration list shall have at
|
|
// least one declarator'.
|
|
// NOTE: GCC just makes this an ext-warn. It's not clear what it does with
|
|
// the declarations though. It's trivial to ignore them, really hard to do
|
|
// anything else with them.
|
|
if (Tok.is(tok::semi)) {
|
|
Diag(DSStart, diag::err_declaration_does_not_declare_param);
|
|
ConsumeToken();
|
|
continue;
|
|
}
|
|
|
|
// C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
|
|
// than register.
|
|
if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
|
|
DS.getStorageClassSpec() != DeclSpec::SCS_register) {
|
|
Diag(DS.getStorageClassSpecLoc(),
|
|
diag::err_invalid_storage_class_in_func_decl);
|
|
DS.ClearStorageClassSpecs();
|
|
}
|
|
if (DS.isThreadSpecified()) {
|
|
Diag(DS.getThreadSpecLoc(),
|
|
diag::err_invalid_storage_class_in_func_decl);
|
|
DS.ClearStorageClassSpecs();
|
|
}
|
|
|
|
// Parse the first declarator attached to this declspec.
|
|
Declarator ParmDeclarator(DS, Declarator::KNRTypeListContext);
|
|
ParseDeclarator(ParmDeclarator);
|
|
|
|
// Handle the full declarator list.
|
|
while (1) {
|
|
// If attributes are present, parse them.
|
|
if (Tok.is(tok::kw___attribute)) {
|
|
SourceLocation Loc;
|
|
AttributeList *AttrList = ParseGNUAttributes(&Loc);
|
|
ParmDeclarator.AddAttributes(AttrList, Loc);
|
|
}
|
|
|
|
// Ask the actions module to compute the type for this declarator.
|
|
Decl *Param =
|
|
Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
|
|
|
|
if (Param &&
|
|
// A missing identifier has already been diagnosed.
|
|
ParmDeclarator.getIdentifier()) {
|
|
|
|
// Scan the argument list looking for the correct param to apply this
|
|
// type.
|
|
for (unsigned i = 0; ; ++i) {
|
|
// C99 6.9.1p6: those declarators shall declare only identifiers from
|
|
// the identifier list.
|
|
if (i == FTI.NumArgs) {
|
|
Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
|
|
<< ParmDeclarator.getIdentifier();
|
|
break;
|
|
}
|
|
|
|
if (FTI.ArgInfo[i].Ident == ParmDeclarator.getIdentifier()) {
|
|
// Reject redefinitions of parameters.
|
|
if (FTI.ArgInfo[i].Param) {
|
|
Diag(ParmDeclarator.getIdentifierLoc(),
|
|
diag::err_param_redefinition)
|
|
<< ParmDeclarator.getIdentifier();
|
|
} else {
|
|
FTI.ArgInfo[i].Param = Param;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we don't have a comma, it is either the end of the list (a ';') or
|
|
// an error, bail out.
|
|
if (Tok.isNot(tok::comma))
|
|
break;
|
|
|
|
// Consume the comma.
|
|
ConsumeToken();
|
|
|
|
// Parse the next declarator.
|
|
ParmDeclarator.clear();
|
|
ParseDeclarator(ParmDeclarator);
|
|
}
|
|
|
|
if (Tok.is(tok::semi)) {
|
|
ConsumeToken();
|
|
} else {
|
|
Diag(Tok, diag::err_parse_error);
|
|
// Skip to end of block or statement
|
|
SkipUntil(tok::semi, true);
|
|
if (Tok.is(tok::semi))
|
|
ConsumeToken();
|
|
}
|
|
}
|
|
|
|
// The actions module must verify that all arguments were declared.
|
|
Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation());
|
|
}
|
|
|
|
|
|
/// ParseAsmStringLiteral - This is just a normal string-literal, but is not
|
|
/// allowed to be a wide string, and is not subject to character translation.
|
|
///
|
|
/// [GNU] asm-string-literal:
|
|
/// string-literal
|
|
///
|
|
Parser::ExprResult Parser::ParseAsmStringLiteral() {
|
|
if (!isTokenStringLiteral()) {
|
|
Diag(Tok, diag::err_expected_string_literal);
|
|
return ExprError();
|
|
}
|
|
|
|
ExprResult Res(ParseStringLiteralExpression());
|
|
if (Res.isInvalid()) return move(Res);
|
|
|
|
// TODO: Diagnose: wide string literal in 'asm'
|
|
|
|
return move(Res);
|
|
}
|
|
|
|
/// ParseSimpleAsm
|
|
///
|
|
/// [GNU] simple-asm-expr:
|
|
/// 'asm' '(' asm-string-literal ')'
|
|
///
|
|
Parser::ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
|
|
assert(Tok.is(tok::kw_asm) && "Not an asm!");
|
|
SourceLocation Loc = ConsumeToken();
|
|
|
|
if (Tok.is(tok::kw_volatile)) {
|
|
// Remove from the end of 'asm' to the end of 'volatile'.
|
|
SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
|
|
PP.getLocForEndOfToken(Tok.getLocation()));
|
|
|
|
Diag(Tok, diag::warn_file_asm_volatile)
|
|
<< FixItHint::CreateRemoval(RemovalRange);
|
|
ConsumeToken();
|
|
}
|
|
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
Diag(Tok, diag::err_expected_lparen_after) << "asm";
|
|
return ExprError();
|
|
}
|
|
|
|
Loc = ConsumeParen();
|
|
|
|
ExprResult Result(ParseAsmStringLiteral());
|
|
|
|
if (Result.isInvalid()) {
|
|
SkipUntil(tok::r_paren, true, true);
|
|
if (EndLoc)
|
|
*EndLoc = Tok.getLocation();
|
|
ConsumeAnyToken();
|
|
} else {
|
|
Loc = MatchRHSPunctuation(tok::r_paren, Loc);
|
|
if (EndLoc)
|
|
*EndLoc = Loc;
|
|
}
|
|
|
|
return move(Result);
|
|
}
|
|
|
|
/// TryAnnotateTypeOrScopeToken - If the current token position is on a
|
|
/// typename (possibly qualified in C++) or a C++ scope specifier not followed
|
|
/// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
|
|
/// with a single annotation token representing the typename or C++ scope
|
|
/// respectively.
|
|
/// This simplifies handling of C++ scope specifiers and allows efficient
|
|
/// backtracking without the need to re-parse and resolve nested-names and
|
|
/// typenames.
|
|
/// It will mainly be called when we expect to treat identifiers as typenames
|
|
/// (if they are typenames). For example, in C we do not expect identifiers
|
|
/// inside expressions to be treated as typenames so it will not be called
|
|
/// for expressions in C.
|
|
/// The benefit for C/ObjC is that a typename will be annotated and
|
|
/// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
|
|
/// will not be called twice, once to check whether we have a declaration
|
|
/// specifier, and another one to get the actual type inside
|
|
/// ParseDeclarationSpecifiers).
|
|
///
|
|
/// This returns true if an error occurred.
|
|
///
|
|
/// Note that this routine emits an error if you call it with ::new or ::delete
|
|
/// as the current tokens, so only call it in contexts where these are invalid.
|
|
bool Parser::TryAnnotateTypeOrScopeToken(bool EnteringContext) {
|
|
assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon)
|
|
|| Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope)) &&
|
|
"Cannot be a type or scope token!");
|
|
|
|
if (Tok.is(tok::kw_typename)) {
|
|
// Parse a C++ typename-specifier, e.g., "typename T::type".
|
|
//
|
|
// typename-specifier:
|
|
// 'typename' '::' [opt] nested-name-specifier identifier
|
|
// 'typename' '::' [opt] nested-name-specifier template [opt]
|
|
// simple-template-id
|
|
SourceLocation TypenameLoc = ConsumeToken();
|
|
CXXScopeSpec SS;
|
|
if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/ParsedType(), false))
|
|
return true;
|
|
if (!SS.isSet()) {
|
|
Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
|
|
return true;
|
|
}
|
|
|
|
TypeResult Ty;
|
|
if (Tok.is(tok::identifier)) {
|
|
// FIXME: check whether the next token is '<', first!
|
|
Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
|
|
*Tok.getIdentifierInfo(),
|
|
Tok.getLocation());
|
|
} else if (Tok.is(tok::annot_template_id)) {
|
|
TemplateIdAnnotation *TemplateId
|
|
= static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
|
|
if (TemplateId->Kind == TNK_Function_template) {
|
|
Diag(Tok, diag::err_typename_refers_to_non_type_template)
|
|
<< Tok.getAnnotationRange();
|
|
return true;
|
|
}
|
|
|
|
AnnotateTemplateIdTokenAsType(0);
|
|
assert(Tok.is(tok::annot_typename) &&
|
|
"AnnotateTemplateIdTokenAsType isn't working properly");
|
|
if (Tok.getAnnotationValue())
|
|
Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
|
|
SourceLocation(),
|
|
getTypeAnnotation(Tok));
|
|
else
|
|
Ty = true;
|
|
} else {
|
|
Diag(Tok, diag::err_expected_type_name_after_typename)
|
|
<< SS.getRange();
|
|
return true;
|
|
}
|
|
|
|
SourceLocation EndLoc = Tok.getLastLoc();
|
|
Tok.setKind(tok::annot_typename);
|
|
setTypeAnnotation(Tok, Ty.isInvalid() ? ParsedType() : Ty.get());
|
|
Tok.setAnnotationEndLoc(EndLoc);
|
|
Tok.setLocation(TypenameLoc);
|
|
PP.AnnotateCachedTokens(Tok);
|
|
return false;
|
|
}
|
|
|
|
// Remembers whether the token was originally a scope annotation.
|
|
bool wasScopeAnnotation = Tok.is(tok::annot_cxxscope);
|
|
|
|
CXXScopeSpec SS;
|
|
if (getLang().CPlusPlus)
|
|
if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext))
|
|
return true;
|
|
|
|
if (Tok.is(tok::identifier)) {
|
|
// Determine whether the identifier is a type name.
|
|
if (ParsedType Ty = Actions.getTypeName(*Tok.getIdentifierInfo(),
|
|
Tok.getLocation(), getCurScope(),
|
|
&SS)) {
|
|
// This is a typename. Replace the current token in-place with an
|
|
// annotation type token.
|
|
Tok.setKind(tok::annot_typename);
|
|
setTypeAnnotation(Tok, Ty);
|
|
Tok.setAnnotationEndLoc(Tok.getLocation());
|
|
if (SS.isNotEmpty()) // it was a C++ qualified type name.
|
|
Tok.setLocation(SS.getBeginLoc());
|
|
|
|
// In case the tokens were cached, have Preprocessor replace
|
|
// them with the annotation token.
|
|
PP.AnnotateCachedTokens(Tok);
|
|
return false;
|
|
}
|
|
|
|
if (!getLang().CPlusPlus) {
|
|
// If we're in C, we can't have :: tokens at all (the lexer won't return
|
|
// them). If the identifier is not a type, then it can't be scope either,
|
|
// just early exit.
|
|
return false;
|
|
}
|
|
|
|
// If this is a template-id, annotate with a template-id or type token.
|
|
if (NextToken().is(tok::less)) {
|
|
TemplateTy Template;
|
|
UnqualifiedId TemplateName;
|
|
TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
|
|
bool MemberOfUnknownSpecialization;
|
|
if (TemplateNameKind TNK
|
|
= Actions.isTemplateName(getCurScope(), SS,
|
|
/*hasTemplateKeyword=*/false, TemplateName,
|
|
/*ObjectType=*/ ParsedType(),
|
|
EnteringContext,
|
|
Template, MemberOfUnknownSpecialization)) {
|
|
// Consume the identifier.
|
|
ConsumeToken();
|
|
if (AnnotateTemplateIdToken(Template, TNK, &SS, TemplateName)) {
|
|
// If an unrecoverable error occurred, we need to return true here,
|
|
// because the token stream is in a damaged state. We may not return
|
|
// a valid identifier.
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
// The current token, which is either an identifier or a
|
|
// template-id, is not part of the annotation. Fall through to
|
|
// push that token back into the stream and complete the C++ scope
|
|
// specifier annotation.
|
|
}
|
|
|
|
if (Tok.is(tok::annot_template_id)) {
|
|
TemplateIdAnnotation *TemplateId
|
|
= static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
|
|
if (TemplateId->Kind == TNK_Type_template) {
|
|
// A template-id that refers to a type was parsed into a
|
|
// template-id annotation in a context where we weren't allowed
|
|
// to produce a type annotation token. Update the template-id
|
|
// annotation token to a type annotation token now.
|
|
AnnotateTemplateIdTokenAsType(&SS);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (SS.isEmpty())
|
|
return false;
|
|
|
|
// A C++ scope specifier that isn't followed by a typename.
|
|
// Push the current token back into the token stream (or revert it if it is
|
|
// cached) and use an annotation scope token for current token.
|
|
if (PP.isBacktrackEnabled())
|
|
PP.RevertCachedTokens(1);
|
|
else
|
|
PP.EnterToken(Tok);
|
|
Tok.setKind(tok::annot_cxxscope);
|
|
Tok.setAnnotationValue(SS.getScopeRep());
|
|
Tok.setAnnotationRange(SS.getRange());
|
|
|
|
// In case the tokens were cached, have Preprocessor replace them
|
|
// with the annotation token. We don't need to do this if we've
|
|
// just reverted back to the state we were in before being called.
|
|
if (!wasScopeAnnotation)
|
|
PP.AnnotateCachedTokens(Tok);
|
|
return false;
|
|
}
|
|
|
|
/// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
|
|
/// annotates C++ scope specifiers and template-ids. This returns
|
|
/// true if the token was annotated or there was an error that could not be
|
|
/// recovered from.
|
|
///
|
|
/// Note that this routine emits an error if you call it with ::new or ::delete
|
|
/// as the current tokens, so only call it in contexts where these are invalid.
|
|
bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
|
|
assert(getLang().CPlusPlus &&
|
|
"Call sites of this function should be guarded by checking for C++");
|
|
assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
|
|
"Cannot be a type or scope token!");
|
|
|
|
CXXScopeSpec SS;
|
|
if (ParseOptionalCXXScopeSpecifier(SS, ParsedType(), EnteringContext))
|
|
return true;
|
|
if (SS.isEmpty())
|
|
return false;
|
|
|
|
// Push the current token back into the token stream (or revert it if it is
|
|
// cached) and use an annotation scope token for current token.
|
|
if (PP.isBacktrackEnabled())
|
|
PP.RevertCachedTokens(1);
|
|
else
|
|
PP.EnterToken(Tok);
|
|
Tok.setKind(tok::annot_cxxscope);
|
|
Tok.setAnnotationValue(SS.getScopeRep());
|
|
Tok.setAnnotationRange(SS.getRange());
|
|
|
|
// In case the tokens were cached, have Preprocessor replace them with the
|
|
// annotation token.
|
|
PP.AnnotateCachedTokens(Tok);
|
|
return false;
|
|
}
|
|
|
|
void Parser::CodeCompletionRecovery() {
|
|
for (Scope *S = getCurScope(); S; S = S->getParent()) {
|
|
if (S->getFlags() & Scope::FnScope) {
|
|
Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_RecoveryInFunction);
|
|
return;
|
|
}
|
|
|
|
if (S->getFlags() & Scope::ClassScope) {
|
|
Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class);
|
|
return;
|
|
}
|
|
}
|
|
|
|
Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace);
|
|
}
|
|
|
|
// Anchor the Parser::FieldCallback vtable to this translation unit.
|
|
// We use a spurious method instead of the destructor because
|
|
// destroying FieldCallbacks can actually be slightly
|
|
// performance-sensitive.
|
|
void Parser::FieldCallback::_anchor() {
|
|
}
|
|
|
|
// Code-completion pass-through functions
|
|
|
|
void Parser::CodeCompleteDirective(bool InConditional) {
|
|
Actions.CodeCompletePreprocessorDirective(InConditional);
|
|
}
|
|
|
|
void Parser::CodeCompleteInConditionalExclusion() {
|
|
Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope());
|
|
}
|
|
|
|
void Parser::CodeCompleteMacroName(bool IsDefinition) {
|
|
Actions.CodeCompletePreprocessorMacroName(IsDefinition);
|
|
}
|
|
|
|
void Parser::CodeCompletePreprocessorExpression() {
|
|
Actions.CodeCompletePreprocessorExpression();
|
|
}
|
|
|
|
void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
|
|
MacroInfo *MacroInfo,
|
|
unsigned ArgumentIndex) {
|
|
Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
|
|
ArgumentIndex);
|
|
}
|
|
|
|
void Parser::CodeCompleteNaturalLanguage() {
|
|
Actions.CodeCompleteNaturalLanguage();
|
|
}
|