Check in LLVM r95781.
diff --git a/lib/Parse/Parser.cpp b/lib/Parse/Parser.cpp
new file mode 100644
index 0000000..e5bed30
--- /dev/null
+++ b/lib/Parse/Parser.cpp
@@ -0,0 +1,1089 @@
+//===--- Parser.cpp - C Language Family Parser ----------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Parser interfaces.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/Parse/Parser.h"
+#include "clang/Parse/ParseDiagnostic.h"
+#include "clang/Parse/DeclSpec.h"
+#include "clang/Parse/Scope.h"
+#include "clang/Parse/Template.h"
+#include "llvm/Support/raw_ostream.h"
+#include "RAIIObjectsForParser.h"
+#include "ParsePragma.h"
+using namespace clang;
+
+/// \brief A comment handler that passes comments found by the preprocessor
+/// to the parser action.
+class ActionCommentHandler : public CommentHandler {
+ Action &Actions;
+
+public:
+ explicit ActionCommentHandler(Action &Actions) : Actions(Actions) { }
+
+ virtual bool HandleComment(Preprocessor &PP, SourceRange Comment) {
+ Actions.ActOnComment(Comment);
+ return false;
+ }
+};
+
+Parser::Parser(Preprocessor &pp, Action &actions)
+ : CrashInfo(*this), PP(pp), Actions(actions), Diags(PP.getDiagnostics()),
+ GreaterThanIsOperator(true), ColonIsSacred(false),
+ TemplateParameterDepth(0) {
+ Tok.setKind(tok::eof);
+ CurScope = 0;
+ NumCachedScopes = 0;
+ ParenCount = BracketCount = BraceCount = 0;
+ ObjCImpDecl = DeclPtrTy();
+
+ // Add #pragma handlers. These are removed and destroyed in the
+ // destructor.
+ PackHandler.reset(new
+ PragmaPackHandler(&PP.getIdentifierTable().get("pack"), actions));
+ PP.AddPragmaHandler(0, PackHandler.get());
+
+ UnusedHandler.reset(new
+ PragmaUnusedHandler(&PP.getIdentifierTable().get("unused"), actions,
+ *this));
+ PP.AddPragmaHandler(0, UnusedHandler.get());
+
+ WeakHandler.reset(new
+ PragmaWeakHandler(&PP.getIdentifierTable().get("weak"), actions));
+ PP.AddPragmaHandler(0, WeakHandler.get());
+
+ CommentHandler.reset(new ActionCommentHandler(actions));
+ PP.AddCommentHandler(CommentHandler.get());
+}
+
+/// If a crash happens while the parser is active, print out a line indicating
+/// what the current token is.
+void PrettyStackTraceParserEntry::print(llvm::raw_ostream &OS) const {
+ const Token &Tok = P.getCurToken();
+ if (Tok.is(tok::eof)) {
+ OS << "<eof> parser at end of file\n";
+ return;
+ }
+
+ if (Tok.getLocation().isInvalid()) {
+ OS << "<unknown> parser at unknown location\n";
+ return;
+ }
+
+ const Preprocessor &PP = P.getPreprocessor();
+ Tok.getLocation().print(OS, PP.getSourceManager());
+ if (Tok.isAnnotation())
+ OS << ": at annotation token \n";
+ else
+ OS << ": current parser token '" << PP.getSpelling(Tok) << "'\n";
+}
+
+
+DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) {
+ return Diags.Report(FullSourceLoc(Loc, PP.getSourceManager()), DiagID);
+}
+
+DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) {
+ return Diag(Tok.getLocation(), DiagID);
+}
+
+/// \brief Emits a diagnostic suggesting parentheses surrounding a
+/// given range.
+///
+/// \param Loc The location where we'll emit the diagnostic.
+/// \param Loc The kind of diagnostic to emit.
+/// \param ParenRange Source range enclosing code that should be parenthesized.
+void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK,
+ SourceRange ParenRange) {
+ SourceLocation EndLoc = PP.getLocForEndOfToken(ParenRange.getEnd());
+ if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
+ // We can't display the parentheses, so just dig the
+ // warning/error and return.
+ Diag(Loc, DK);
+ return;
+ }
+
+ Diag(Loc, DK)
+ << CodeModificationHint::CreateInsertion(ParenRange.getBegin(), "(")
+ << CodeModificationHint::CreateInsertion(EndLoc, ")");
+}
+
+/// MatchRHSPunctuation - For punctuation with a LHS and RHS (e.g. '['/']'),
+/// this helper function matches and consumes the specified RHS token if
+/// present. If not present, it emits the specified diagnostic indicating
+/// that the parser failed to match the RHS of the token at LHSLoc. LHSName
+/// should be the name of the unmatched LHS token.
+SourceLocation Parser::MatchRHSPunctuation(tok::TokenKind RHSTok,
+ SourceLocation LHSLoc) {
+
+ if (Tok.is(RHSTok))
+ return ConsumeAnyToken();
+
+ SourceLocation R = Tok.getLocation();
+ const char *LHSName = "unknown";
+ diag::kind DID = diag::err_parse_error;
+ switch (RHSTok) {
+ default: break;
+ case tok::r_paren : LHSName = "("; DID = diag::err_expected_rparen; break;
+ case tok::r_brace : LHSName = "{"; DID = diag::err_expected_rbrace; break;
+ case tok::r_square: LHSName = "["; DID = diag::err_expected_rsquare; break;
+ case tok::greater: LHSName = "<"; DID = diag::err_expected_greater; break;
+ }
+ Diag(Tok, DID);
+ Diag(LHSLoc, diag::note_matching) << LHSName;
+ SkipUntil(RHSTok);
+ return R;
+}
+
+/// ExpectAndConsume - The parser expects that 'ExpectedTok' is next in the
+/// input. If so, it is consumed and false is returned.
+///
+/// If the input is malformed, this emits the specified diagnostic. Next, if
+/// SkipToTok is specified, it calls SkipUntil(SkipToTok). Finally, true is
+/// returned.
+bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID,
+ const char *Msg, tok::TokenKind SkipToTok) {
+ if (Tok.is(ExpectedTok)) {
+ ConsumeAnyToken();
+ return false;
+ }
+
+ const char *Spelling = 0;
+ SourceLocation EndLoc = PP.getLocForEndOfToken(PrevTokLocation);
+ if (EndLoc.isValid() &&
+ (Spelling = tok::getTokenSimpleSpelling(ExpectedTok))) {
+ // Show what code to insert to fix this problem.
+ Diag(EndLoc, DiagID)
+ << Msg
+ << CodeModificationHint::CreateInsertion(EndLoc, Spelling);
+ } else
+ Diag(Tok, DiagID) << Msg;
+
+ if (SkipToTok != tok::unknown)
+ SkipUntil(SkipToTok);
+ return true;
+}
+
+//===----------------------------------------------------------------------===//
+// Error recovery.
+//===----------------------------------------------------------------------===//
+
+/// SkipUntil - Read tokens until we get to the specified token, then consume
+/// it (unless DontConsume is true). Because we cannot guarantee that the
+/// token will ever occur, this skips to the next token, or to some likely
+/// good stopping point. If StopAtSemi is true, skipping will stop at a ';'
+/// character.
+///
+/// If SkipUntil finds the specified token, it returns true, otherwise it
+/// returns false.
+bool Parser::SkipUntil(const tok::TokenKind *Toks, unsigned NumToks,
+ bool StopAtSemi, bool DontConsume) {
+ // We always want this function to skip at least one token if the first token
+ // isn't T and if not at EOF.
+ bool isFirstTokenSkipped = true;
+ while (1) {
+ // If we found one of the tokens, stop and return true.
+ for (unsigned i = 0; i != NumToks; ++i) {
+ if (Tok.is(Toks[i])) {
+ if (DontConsume) {
+ // Noop, don't consume the token.
+ } else {
+ ConsumeAnyToken();
+ }
+ return true;
+ }
+ }
+
+ switch (Tok.getKind()) {
+ case tok::eof:
+ // Ran out of tokens.
+ return false;
+
+ case tok::l_paren:
+ // Recursively skip properly-nested parens.
+ ConsumeParen();
+ SkipUntil(tok::r_paren, false);
+ break;
+ case tok::l_square:
+ // Recursively skip properly-nested square brackets.
+ ConsumeBracket();
+ SkipUntil(tok::r_square, false);
+ break;
+ case tok::l_brace:
+ // Recursively skip properly-nested braces.
+ ConsumeBrace();
+ SkipUntil(tok::r_brace, false);
+ break;
+
+ // Okay, we found a ']' or '}' or ')', which we think should be balanced.
+ // Since the user wasn't looking for this token (if they were, it would
+ // already be handled), this isn't balanced. If there is a LHS token at a
+ // higher level, we will assume that this matches the unbalanced token
+ // and return it. Otherwise, this is a spurious RHS token, which we skip.
+ case tok::r_paren:
+ if (ParenCount && !isFirstTokenSkipped)
+ return false; // Matches something.
+ ConsumeParen();
+ break;
+ case tok::r_square:
+ if (BracketCount && !isFirstTokenSkipped)
+ return false; // Matches something.
+ ConsumeBracket();
+ break;
+ case tok::r_brace:
+ if (BraceCount && !isFirstTokenSkipped)
+ return false; // Matches something.
+ ConsumeBrace();
+ break;
+
+ case tok::string_literal:
+ case tok::wide_string_literal:
+ ConsumeStringToken();
+ break;
+ case tok::semi:
+ if (StopAtSemi)
+ return false;
+ // FALL THROUGH.
+ default:
+ // Skip this token.
+ ConsumeToken();
+ break;
+ }
+ isFirstTokenSkipped = false;
+ }
+}
+
+//===----------------------------------------------------------------------===//
+// Scope manipulation
+//===----------------------------------------------------------------------===//
+
+/// EnterScope - Start a new scope.
+void Parser::EnterScope(unsigned ScopeFlags) {
+ if (NumCachedScopes) {
+ Scope *N = ScopeCache[--NumCachedScopes];
+ N->Init(CurScope, ScopeFlags);
+ CurScope = N;
+ } else {
+ CurScope = new Scope(CurScope, ScopeFlags);
+ }
+}
+
+/// ExitScope - Pop a scope off the scope stack.
+void Parser::ExitScope() {
+ assert(CurScope && "Scope imbalance!");
+
+ // Inform the actions module that this scope is going away if there are any
+ // decls in it.
+ if (!CurScope->decl_empty())
+ Actions.ActOnPopScope(Tok.getLocation(), CurScope);
+
+ Scope *OldScope = CurScope;
+ CurScope = OldScope->getParent();
+
+ if (NumCachedScopes == ScopeCacheSize)
+ delete OldScope;
+ else
+ ScopeCache[NumCachedScopes++] = OldScope;
+}
+
+
+
+
+//===----------------------------------------------------------------------===//
+// C99 6.9: External Definitions.
+//===----------------------------------------------------------------------===//
+
+Parser::~Parser() {
+ // If we still have scopes active, delete the scope tree.
+ delete CurScope;
+
+ // Free the scope cache.
+ for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
+ delete ScopeCache[i];
+
+ // Remove the pragma handlers we installed.
+ PP.RemovePragmaHandler(0, PackHandler.get());
+ PackHandler.reset();
+ PP.RemovePragmaHandler(0, UnusedHandler.get());
+ UnusedHandler.reset();
+ PP.RemovePragmaHandler(0, WeakHandler.get());
+ WeakHandler.reset();
+ PP.RemoveCommentHandler(CommentHandler.get());
+}
+
+/// Initialize - Warm up the parser.
+///
+void Parser::Initialize() {
+ // Prime the lexer look-ahead.
+ ConsumeToken();
+
+ // Create the translation unit scope. Install it as the current scope.
+ assert(CurScope == 0 && "A scope is already active?");
+ EnterScope(Scope::DeclScope);
+ Actions.ActOnTranslationUnitScope(Tok.getLocation(), CurScope);
+
+ if (Tok.is(tok::eof) &&
+ !getLang().CPlusPlus) // Empty source file is an extension in C
+ Diag(Tok, diag::ext_empty_source_file);
+
+ // Initialization for Objective-C context sensitive keywords recognition.
+ // Referenced in Parser::ParseObjCTypeQualifierList.
+ if (getLang().ObjC1) {
+ ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
+ ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
+ ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
+ ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
+ ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
+ ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
+ }
+
+ Ident_super = &PP.getIdentifierTable().get("super");
+
+ if (getLang().AltiVec) {
+ Ident_vector = &PP.getIdentifierTable().get("vector");
+ Ident_pixel = &PP.getIdentifierTable().get("pixel");
+ }
+}
+
+/// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
+/// action tells us to. This returns true if the EOF was encountered.
+bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
+ Result = DeclGroupPtrTy();
+ if (Tok.is(tok::eof)) {
+ Actions.ActOnEndOfTranslationUnit();
+ return true;
+ }
+
+ CXX0XAttributeList Attr;
+ if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
+ Attr = ParseCXX0XAttributes();
+ Result = ParseExternalDeclaration(Attr);
+ return false;
+}
+
+/// ParseTranslationUnit:
+/// translation-unit: [C99 6.9]
+/// external-declaration
+/// translation-unit external-declaration
+void Parser::ParseTranslationUnit() {
+ Initialize();
+
+ DeclGroupPtrTy Res;
+ while (!ParseTopLevelDecl(Res))
+ /*parse them all*/;
+
+ ExitScope();
+ assert(CurScope == 0 && "Scope imbalance!");
+}
+
+/// ParseExternalDeclaration:
+///
+/// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
+/// function-definition
+/// declaration
+/// [C++0x] empty-declaration
+/// [GNU] asm-definition
+/// [GNU] __extension__ external-declaration
+/// [OBJC] objc-class-definition
+/// [OBJC] objc-class-declaration
+/// [OBJC] objc-alias-declaration
+/// [OBJC] objc-protocol-definition
+/// [OBJC] objc-method-definition
+/// [OBJC] @end
+/// [C++] linkage-specification
+/// [GNU] asm-definition:
+/// simple-asm-expr ';'
+///
+/// [C++0x] empty-declaration:
+/// ';'
+///
+/// [C++0x/GNU] 'extern' 'template' declaration
+Parser::DeclGroupPtrTy Parser::ParseExternalDeclaration(CXX0XAttributeList Attr) {
+ DeclPtrTy SingleDecl;
+ switch (Tok.getKind()) {
+ case tok::semi:
+ if (!getLang().CPlusPlus0x)
+ Diag(Tok, diag::ext_top_level_semi)
+ << CodeModificationHint::CreateRemoval(Tok.getLocation());
+
+ ConsumeToken();
+ // TODO: Invoke action for top-level semicolon.
+ return DeclGroupPtrTy();
+ case tok::r_brace:
+ Diag(Tok, diag::err_expected_external_declaration);
+ ConsumeBrace();
+ return DeclGroupPtrTy();
+ case tok::eof:
+ Diag(Tok, diag::err_expected_external_declaration);
+ return DeclGroupPtrTy();
+ case tok::kw___extension__: {
+ // __extension__ silences extension warnings in the subexpression.
+ ExtensionRAIIObject O(Diags); // Use RAII to do this.
+ ConsumeToken();
+ return ParseExternalDeclaration(Attr);
+ }
+ case tok::kw_asm: {
+ if (Attr.HasAttr)
+ Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
+ << Attr.Range;
+
+ OwningExprResult Result(ParseSimpleAsm());
+
+ ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
+ "top-level asm block");
+
+ if (Result.isInvalid())
+ return DeclGroupPtrTy();
+ SingleDecl = Actions.ActOnFileScopeAsmDecl(Tok.getLocation(), move(Result));
+ break;
+ }
+ case tok::at:
+ // @ is not a legal token unless objc is enabled, no need to check for ObjC.
+ /// FIXME: ParseObjCAtDirectives should return a DeclGroup for things like
+ /// @class foo, bar;
+ SingleDecl = ParseObjCAtDirectives();
+ break;
+ case tok::minus:
+ case tok::plus:
+ if (!getLang().ObjC1) {
+ Diag(Tok, diag::err_expected_external_declaration);
+ ConsumeToken();
+ return DeclGroupPtrTy();
+ }
+ SingleDecl = ParseObjCMethodDefinition();
+ break;
+ case tok::code_completion:
+ Actions.CodeCompleteOrdinaryName(CurScope,
+ ObjCImpDecl? Action::CCC_ObjCImplementation
+ : Action::CCC_Namespace);
+ ConsumeToken();
+ return ParseExternalDeclaration(Attr);
+ case tok::kw_using:
+ case tok::kw_namespace:
+ case tok::kw_typedef:
+ case tok::kw_template:
+ case tok::kw_export: // As in 'export template'
+ case tok::kw_static_assert:
+ // A function definition cannot start with a these keywords.
+ {
+ SourceLocation DeclEnd;
+ return ParseDeclaration(Declarator::FileContext, DeclEnd, Attr);
+ }
+ case tok::kw_extern:
+ if (getLang().CPlusPlus && NextToken().is(tok::kw_template)) {
+ // Extern templates
+ SourceLocation ExternLoc = ConsumeToken();
+ SourceLocation TemplateLoc = ConsumeToken();
+ SourceLocation DeclEnd;
+ return Actions.ConvertDeclToDeclGroup(
+ ParseExplicitInstantiation(ExternLoc, TemplateLoc, DeclEnd));
+ }
+
+ // FIXME: Detect C++ linkage specifications here?
+
+ // Fall through to handle other declarations or function definitions.
+
+ default:
+ // We can't tell whether this is a function-definition or declaration yet.
+ return ParseDeclarationOrFunctionDefinition(Attr.AttrList);
+ }
+
+ // This routine returns a DeclGroup, if the thing we parsed only contains a
+ // 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() {
+ 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() {
+ if (Tok.is(tok::l_brace)) // int X() {}
+ return true;
+
+ if (!getLang().CPlusPlus)
+ return isDeclarationSpecifier(); // int X(f) int f; {}
+ 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();
+ DeclPtrTy TheDecl = Actions.ParsedFreeStandingDeclSpec(CurScope, 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;
+
+ DeclPtrTy TheDecl;
+ 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) {
+ DeclPtrTy 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
+///
+Parser::DeclPtrTy 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.hasPrototype && FTI.NumArgs != 0)
+ 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 DeclPtrTy();
+ }
+
+ // 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.
+ DeclPtrTy Res = TemplateInfo.TemplateParams?
+ Actions.ActOnStartOfFunctionTemplateDef(CurScope,
+ Action::MultiTemplateParamsArg(Actions,
+ TemplateInfo.TemplateParams->data(),
+ TemplateInfo.TemplateParams->size()),
+ D)
+ : Actions.ActOnStartOfFunctionDef(CurScope, 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);
+ 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) {
+ Action::AttrTy *AttrList;
+ // If attributes are present, parse them.
+ if (Tok.is(tok::kw___attribute))
+ // FIXME: attach attributes too.
+ AttrList = ParseGNUAttributes();
+
+ // Ask the actions module to compute the type for this declarator.
+ Action::DeclPtrTy Param =
+ Actions.ActOnParamDeclarator(CurScope, 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(CurScope, 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::OwningExprResult Parser::ParseAsmStringLiteral() {
+ if (!isTokenStringLiteral()) {
+ Diag(Tok, diag::err_expected_string_literal);
+ return ExprError();
+ }
+
+ OwningExprResult 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::OwningExprResult 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)
+ << CodeModificationHint::CreateRemoval(RemovalRange);
+ ConsumeToken();
+ }
+
+ if (Tok.isNot(tok::l_paren)) {
+ Diag(Tok, diag::err_expected_lparen_after) << "asm";
+ return ExprError();
+ }
+
+ Loc = ConsumeParen();
+
+ OwningExprResult 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 the token was annotated or an unrecoverable error
+/// occurs.
+///
+/// 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;
+ bool HadNestedNameSpecifier
+ = ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
+ if (!HadNestedNameSpecifier) {
+ Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
+ return false;
+ }
+
+ TypeResult Ty;
+ if (Tok.is(tok::identifier)) {
+ // FIXME: check whether the next token is '<', first!
+ Ty = Actions.ActOnTypenameType(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 false;
+ }
+
+ AnnotateTemplateIdTokenAsType(0);
+ assert(Tok.is(tok::annot_typename) &&
+ "AnnotateTemplateIdTokenAsType isn't working properly");
+ if (Tok.getAnnotationValue())
+ Ty = Actions.ActOnTypenameType(TypenameLoc, SS, SourceLocation(),
+ Tok.getAnnotationValue());
+ else
+ Ty = true;
+ } else {
+ Diag(Tok, diag::err_expected_type_name_after_typename)
+ << SS.getRange();
+ return false;
+ }
+
+ SourceLocation EndLoc = Tok.getLastLoc();
+ Tok.setKind(tok::annot_typename);
+ Tok.setAnnotationValue(Ty.isInvalid()? 0 : Ty.get());
+ Tok.setAnnotationEndLoc(EndLoc);
+ Tok.setLocation(TypenameLoc);
+ PP.AnnotateCachedTokens(Tok);
+ return true;
+ }
+
+ // Remembers whether the token was originally a scope annotation.
+ bool wasScopeAnnotation = Tok.is(tok::annot_cxxscope);
+
+ CXXScopeSpec SS;
+ if (getLang().CPlusPlus)
+ ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, EnteringContext);
+
+ if (Tok.is(tok::identifier)) {
+ // Determine whether the identifier is a type name.
+ if (TypeTy *Ty = Actions.getTypeName(*Tok.getIdentifierInfo(),
+ Tok.getLocation(), CurScope, &SS)) {
+ // This is a typename. Replace the current token in-place with an
+ // annotation type token.
+ Tok.setKind(tok::annot_typename);
+ Tok.setAnnotationValue(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 true;
+ }
+
+ 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());
+ if (TemplateNameKind TNK
+ = Actions.isTemplateName(CurScope, SS, TemplateName,
+ /*ObjectType=*/0, EnteringContext,
+ Template)) {
+ // 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 Tok.isNot(tok::identifier);
+ }
+ }
+ }
+
+ // 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 true;
+ }
+ }
+
+ if (SS.isEmpty())
+ return Tok.isNot(tok::identifier) && Tok.isNot(tok::coloncolon);
+
+ // 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 true;
+}
+
+/// 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, /*ObjectType=*/0, EnteringContext))
+ // If the token left behind is not an identifier, we either had an error or
+ // successfully turned it into an annotation token.
+ return Tok.isNot(tok::identifier);
+
+ // 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 true;
+}
+
+// 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() {
+}