Check in LLVM r95781.
diff --git a/lib/Parse/ParseTemplate.cpp b/lib/Parse/ParseTemplate.cpp
new file mode 100644
index 0000000..12f26bf
--- /dev/null
+++ b/lib/Parse/ParseTemplate.cpp
@@ -0,0 +1,1013 @@
+//===--- ParseTemplate.cpp - Template Parsing -----------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements parsing of C++ templates.
+//
+//===----------------------------------------------------------------------===//
+
+#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 "RAIIObjectsForParser.h"
+using namespace clang;
+
+/// \brief Parse a template declaration, explicit instantiation, or
+/// explicit specialization.
+Parser::DeclPtrTy
+Parser::ParseDeclarationStartingWithTemplate(unsigned Context,
+ SourceLocation &DeclEnd,
+ AccessSpecifier AS) {
+ if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less))
+ return ParseExplicitInstantiation(SourceLocation(), ConsumeToken(),
+ DeclEnd);
+
+ return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AS);
+}
+
+/// \brief RAII class that manages the template parameter depth.
+namespace {
+ class TemplateParameterDepthCounter {
+ unsigned &Depth;
+ unsigned AddedLevels;
+
+ public:
+ explicit TemplateParameterDepthCounter(unsigned &Depth)
+ : Depth(Depth), AddedLevels(0) { }
+
+ ~TemplateParameterDepthCounter() {
+ Depth -= AddedLevels;
+ }
+
+ void operator++() {
+ ++Depth;
+ ++AddedLevels;
+ }
+
+ operator unsigned() const { return Depth; }
+ };
+}
+
+/// \brief Parse a template declaration or an explicit specialization.
+///
+/// Template declarations include one or more template parameter lists
+/// and either the function or class template declaration. Explicit
+/// specializations contain one or more 'template < >' prefixes
+/// followed by a (possibly templated) declaration. Since the
+/// syntactic form of both features is nearly identical, we parse all
+/// of the template headers together and let semantic analysis sort
+/// the declarations from the explicit specializations.
+///
+/// template-declaration: [C++ temp]
+/// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
+///
+/// explicit-specialization: [ C++ temp.expl.spec]
+/// 'template' '<' '>' declaration
+Parser::DeclPtrTy
+Parser::ParseTemplateDeclarationOrSpecialization(unsigned Context,
+ SourceLocation &DeclEnd,
+ AccessSpecifier AS) {
+ assert((Tok.is(tok::kw_export) || Tok.is(tok::kw_template)) &&
+ "Token does not start a template declaration.");
+
+ // Enter template-parameter scope.
+ ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
+
+ // Parse multiple levels of template headers within this template
+ // parameter scope, e.g.,
+ //
+ // template<typename T>
+ // template<typename U>
+ // class A<T>::B { ... };
+ //
+ // We parse multiple levels non-recursively so that we can build a
+ // single data structure containing all of the template parameter
+ // lists to easily differentiate between the case above and:
+ //
+ // template<typename T>
+ // class A {
+ // template<typename U> class B;
+ // };
+ //
+ // In the first case, the action for declaring A<T>::B receives
+ // both template parameter lists. In the second case, the action for
+ // defining A<T>::B receives just the inner template parameter list
+ // (and retrieves the outer template parameter list from its
+ // context).
+ bool isSpecialization = true;
+ bool LastParamListWasEmpty = false;
+ TemplateParameterLists ParamLists;
+ TemplateParameterDepthCounter Depth(TemplateParameterDepth);
+ do {
+ // Consume the 'export', if any.
+ SourceLocation ExportLoc;
+ if (Tok.is(tok::kw_export)) {
+ ExportLoc = ConsumeToken();
+ }
+
+ // Consume the 'template', which should be here.
+ SourceLocation TemplateLoc;
+ if (Tok.is(tok::kw_template)) {
+ TemplateLoc = ConsumeToken();
+ } else {
+ Diag(Tok.getLocation(), diag::err_expected_template);
+ return DeclPtrTy();
+ }
+
+ // Parse the '<' template-parameter-list '>'
+ SourceLocation LAngleLoc, RAngleLoc;
+ TemplateParameterList TemplateParams;
+ if (ParseTemplateParameters(Depth, TemplateParams, LAngleLoc,
+ RAngleLoc)) {
+ // Skip until the semi-colon or a }.
+ SkipUntil(tok::r_brace, true, true);
+ if (Tok.is(tok::semi))
+ ConsumeToken();
+ return DeclPtrTy();
+ }
+
+ ParamLists.push_back(
+ Actions.ActOnTemplateParameterList(Depth, ExportLoc,
+ TemplateLoc, LAngleLoc,
+ TemplateParams.data(),
+ TemplateParams.size(), RAngleLoc));
+
+ if (!TemplateParams.empty()) {
+ isSpecialization = false;
+ ++Depth;
+ } else {
+ LastParamListWasEmpty = true;
+ }
+ } while (Tok.is(tok::kw_export) || Tok.is(tok::kw_template));
+
+ // Parse the actual template declaration.
+ return ParseSingleDeclarationAfterTemplate(Context,
+ ParsedTemplateInfo(&ParamLists,
+ isSpecialization,
+ LastParamListWasEmpty),
+ DeclEnd, AS);
+}
+
+/// \brief Parse a single declaration that declares a template,
+/// template specialization, or explicit instantiation of a template.
+///
+/// \param TemplateParams if non-NULL, the template parameter lists
+/// that preceded this declaration. In this case, the declaration is a
+/// template declaration, out-of-line definition of a template, or an
+/// explicit template specialization. When NULL, the declaration is an
+/// explicit template instantiation.
+///
+/// \param TemplateLoc when TemplateParams is NULL, the location of
+/// the 'template' keyword that indicates that we have an explicit
+/// template instantiation.
+///
+/// \param DeclEnd will receive the source location of the last token
+/// within this declaration.
+///
+/// \param AS the access specifier associated with this
+/// declaration. Will be AS_none for namespace-scope declarations.
+///
+/// \returns the new declaration.
+Parser::DeclPtrTy
+Parser::ParseSingleDeclarationAfterTemplate(
+ unsigned Context,
+ const ParsedTemplateInfo &TemplateInfo,
+ SourceLocation &DeclEnd,
+ AccessSpecifier AS) {
+ assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
+ "Template information required");
+
+ if (Context == Declarator::MemberContext) {
+ // We are parsing a member template.
+ ParseCXXClassMemberDeclaration(AS, TemplateInfo);
+ return DeclPtrTy::make((void*)0);
+ }
+
+ // Parse the declaration specifiers.
+ ParsingDeclSpec DS(*this);
+
+ if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
+ DS.AddAttributes(ParseCXX0XAttributes().AttrList);
+
+ ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
+ getDeclSpecContextFromDeclaratorContext(Context));
+
+ if (Tok.is(tok::semi)) {
+ DeclEnd = ConsumeToken();
+ DeclPtrTy Decl = Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
+ DS.complete(Decl);
+ return Decl;
+ }
+
+ // Parse the declarator.
+ ParsingDeclarator DeclaratorInfo(*this, DS, (Declarator::TheContext)Context);
+ ParseDeclarator(DeclaratorInfo);
+ // Error parsing the declarator?
+ if (!DeclaratorInfo.hasName()) {
+ // If so, skip until the semi-colon or a }.
+ SkipUntil(tok::r_brace, true, true);
+ if (Tok.is(tok::semi))
+ ConsumeToken();
+ return DeclPtrTy();
+ }
+
+ // If we have a declaration or declarator list, handle it.
+ if (isDeclarationAfterDeclarator()) {
+ // Parse this declaration.
+ DeclPtrTy ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
+ TemplateInfo);
+
+ if (Tok.is(tok::comma)) {
+ Diag(Tok, diag::err_multiple_template_declarators)
+ << (int)TemplateInfo.Kind;
+ SkipUntil(tok::semi, true, false);
+ return ThisDecl;
+ }
+
+ // Eat the semi colon after the declaration.
+ ExpectAndConsume(tok::semi, diag::err_expected_semi_declaration);
+ DS.complete(ThisDecl);
+ return ThisDecl;
+ }
+
+ if (DeclaratorInfo.isFunctionDeclarator() &&
+ isStartOfFunctionDefinition()) {
+ if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
+ Diag(Tok, diag::err_function_declared_typedef);
+
+ if (Tok.is(tok::l_brace)) {
+ // This recovery skips the entire function body. It would be nice
+ // to simply call ParseFunctionDefinition() below, however Sema
+ // assumes the declarator represents a function, not a typedef.
+ ConsumeBrace();
+ SkipUntil(tok::r_brace, true);
+ } else {
+ SkipUntil(tok::semi);
+ }
+ return DeclPtrTy();
+ }
+ return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo);
+ }
+
+ if (DeclaratorInfo.isFunctionDeclarator())
+ Diag(Tok, diag::err_expected_fn_body);
+ else
+ Diag(Tok, diag::err_invalid_token_after_toplevel_declarator);
+ SkipUntil(tok::semi);
+ return DeclPtrTy();
+}
+
+/// ParseTemplateParameters - Parses a template-parameter-list enclosed in
+/// angle brackets. Depth is the depth of this template-parameter-list, which
+/// is the number of template headers directly enclosing this template header.
+/// TemplateParams is the current list of template parameters we're building.
+/// The template parameter we parse will be added to this list. LAngleLoc and
+/// RAngleLoc will receive the positions of the '<' and '>', respectively,
+/// that enclose this template parameter list.
+///
+/// \returns true if an error occurred, false otherwise.
+bool Parser::ParseTemplateParameters(unsigned Depth,
+ TemplateParameterList &TemplateParams,
+ SourceLocation &LAngleLoc,
+ SourceLocation &RAngleLoc) {
+ // Get the template parameter list.
+ if (!Tok.is(tok::less)) {
+ Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
+ return true;
+ }
+ LAngleLoc = ConsumeToken();
+
+ // Try to parse the template parameter list.
+ if (Tok.is(tok::greater))
+ RAngleLoc = ConsumeToken();
+ else if (ParseTemplateParameterList(Depth, TemplateParams)) {
+ if (!Tok.is(tok::greater)) {
+ Diag(Tok.getLocation(), diag::err_expected_greater);
+ return true;
+ }
+ RAngleLoc = ConsumeToken();
+ }
+ return false;
+}
+
+/// ParseTemplateParameterList - Parse a template parameter list. If
+/// the parsing fails badly (i.e., closing bracket was left out), this
+/// will try to put the token stream in a reasonable position (closing
+/// a statement, etc.) and return false.
+///
+/// template-parameter-list: [C++ temp]
+/// template-parameter
+/// template-parameter-list ',' template-parameter
+bool
+Parser::ParseTemplateParameterList(unsigned Depth,
+ TemplateParameterList &TemplateParams) {
+ while (1) {
+ if (DeclPtrTy TmpParam
+ = ParseTemplateParameter(Depth, TemplateParams.size())) {
+ TemplateParams.push_back(TmpParam);
+ } else {
+ // If we failed to parse a template parameter, skip until we find
+ // a comma or closing brace.
+ SkipUntil(tok::comma, tok::greater, true, true);
+ }
+
+ // Did we find a comma or the end of the template parmeter list?
+ if (Tok.is(tok::comma)) {
+ ConsumeToken();
+ } else if (Tok.is(tok::greater)) {
+ // Don't consume this... that's done by template parser.
+ break;
+ } else {
+ // Somebody probably forgot to close the template. Skip ahead and
+ // try to get out of the expression. This error is currently
+ // subsumed by whatever goes on in ParseTemplateParameter.
+ // TODO: This could match >>, and it would be nice to avoid those
+ // silly errors with template <vec<T>>.
+ // Diag(Tok.getLocation(), diag::err_expected_comma_greater);
+ SkipUntil(tok::greater, true, true);
+ return false;
+ }
+ }
+ return true;
+}
+
+/// \brief Determine whether the parser is at the start of a template
+/// type parameter.
+bool Parser::isStartOfTemplateTypeParameter() {
+ if (Tok.is(tok::kw_class))
+ return true;
+
+ if (Tok.isNot(tok::kw_typename))
+ return false;
+
+ // C++ [temp.param]p2:
+ // There is no semantic difference between class and typename in a
+ // template-parameter. typename followed by an unqualified-id
+ // names a template type parameter. typename followed by a
+ // qualified-id denotes the type in a non-type
+ // parameter-declaration.
+ Token Next = NextToken();
+
+ // If we have an identifier, skip over it.
+ if (Next.getKind() == tok::identifier)
+ Next = GetLookAheadToken(2);
+
+ switch (Next.getKind()) {
+ case tok::equal:
+ case tok::comma:
+ case tok::greater:
+ case tok::greatergreater:
+ case tok::ellipsis:
+ return true;
+
+ default:
+ return false;
+ }
+}
+
+/// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
+///
+/// template-parameter: [C++ temp.param]
+/// type-parameter
+/// parameter-declaration
+///
+/// type-parameter: (see below)
+/// 'class' ...[opt][C++0x] identifier[opt]
+/// 'class' identifier[opt] '=' type-id
+/// 'typename' ...[opt][C++0x] identifier[opt]
+/// 'typename' identifier[opt] '=' type-id
+/// 'template' ...[opt][C++0x] '<' template-parameter-list '>' 'class' identifier[opt]
+/// 'template' '<' template-parameter-list '>' 'class' identifier[opt] = id-expression
+Parser::DeclPtrTy
+Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
+ if (isStartOfTemplateTypeParameter())
+ return ParseTypeParameter(Depth, Position);
+
+ if (Tok.is(tok::kw_template))
+ return ParseTemplateTemplateParameter(Depth, Position);
+
+ // If it's none of the above, then it must be a parameter declaration.
+ // NOTE: This will pick up errors in the closure of the template parameter
+ // list (e.g., template < ; Check here to implement >> style closures.
+ return ParseNonTypeTemplateParameter(Depth, Position);
+}
+
+/// ParseTypeParameter - Parse a template type parameter (C++ [temp.param]).
+/// Other kinds of template parameters are parsed in
+/// ParseTemplateTemplateParameter and ParseNonTypeTemplateParameter.
+///
+/// type-parameter: [C++ temp.param]
+/// 'class' ...[opt][C++0x] identifier[opt]
+/// 'class' identifier[opt] '=' type-id
+/// 'typename' ...[opt][C++0x] identifier[opt]
+/// 'typename' identifier[opt] '=' type-id
+Parser::DeclPtrTy Parser::ParseTypeParameter(unsigned Depth, unsigned Position){
+ assert((Tok.is(tok::kw_class) || Tok.is(tok::kw_typename)) &&
+ "A type-parameter starts with 'class' or 'typename'");
+
+ // Consume the 'class' or 'typename' keyword.
+ bool TypenameKeyword = Tok.is(tok::kw_typename);
+ SourceLocation KeyLoc = ConsumeToken();
+
+ // Grab the ellipsis (if given).
+ bool Ellipsis = false;
+ SourceLocation EllipsisLoc;
+ if (Tok.is(tok::ellipsis)) {
+ Ellipsis = true;
+ EllipsisLoc = ConsumeToken();
+
+ if (!getLang().CPlusPlus0x)
+ Diag(EllipsisLoc, diag::err_variadic_templates);
+ }
+
+ // Grab the template parameter name (if given)
+ SourceLocation NameLoc;
+ IdentifierInfo* ParamName = 0;
+ if (Tok.is(tok::identifier)) {
+ ParamName = Tok.getIdentifierInfo();
+ NameLoc = ConsumeToken();
+ } else if (Tok.is(tok::equal) || Tok.is(tok::comma) ||
+ Tok.is(tok::greater)) {
+ // Unnamed template parameter. Don't have to do anything here, just
+ // don't consume this token.
+ } else {
+ Diag(Tok.getLocation(), diag::err_expected_ident);
+ return DeclPtrTy();
+ }
+
+ DeclPtrTy TypeParam = Actions.ActOnTypeParameter(CurScope, TypenameKeyword,
+ Ellipsis, EllipsisLoc,
+ KeyLoc, ParamName, NameLoc,
+ Depth, Position);
+
+ // Grab a default type id (if given).
+ if (Tok.is(tok::equal)) {
+ SourceLocation EqualLoc = ConsumeToken();
+ SourceLocation DefaultLoc = Tok.getLocation();
+ TypeResult DefaultType = ParseTypeName();
+ if (!DefaultType.isInvalid())
+ Actions.ActOnTypeParameterDefault(TypeParam, EqualLoc, DefaultLoc,
+ DefaultType.get());
+ }
+
+ return TypeParam;
+}
+
+/// ParseTemplateTemplateParameter - Handle the parsing of template
+/// template parameters.
+///
+/// type-parameter: [C++ temp.param]
+/// 'template' '<' template-parameter-list '>' 'class' identifier[opt]
+/// 'template' '<' template-parameter-list '>' 'class' identifier[opt] = id-expression
+Parser::DeclPtrTy
+Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
+ assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
+
+ // Handle the template <...> part.
+ SourceLocation TemplateLoc = ConsumeToken();
+ TemplateParameterList TemplateParams;
+ SourceLocation LAngleLoc, RAngleLoc;
+ {
+ ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
+ if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
+ RAngleLoc)) {
+ return DeclPtrTy();
+ }
+ }
+
+ // Generate a meaningful error if the user forgot to put class before the
+ // identifier, comma, or greater.
+ if (!Tok.is(tok::kw_class)) {
+ Diag(Tok.getLocation(), diag::err_expected_class_before)
+ << PP.getSpelling(Tok);
+ return DeclPtrTy();
+ }
+ SourceLocation ClassLoc = ConsumeToken();
+
+ // Get the identifier, if given.
+ SourceLocation NameLoc;
+ IdentifierInfo* ParamName = 0;
+ if (Tok.is(tok::identifier)) {
+ ParamName = Tok.getIdentifierInfo();
+ NameLoc = ConsumeToken();
+ } else if (Tok.is(tok::equal) || Tok.is(tok::comma) || Tok.is(tok::greater)) {
+ // Unnamed template parameter. Don't have to do anything here, just
+ // don't consume this token.
+ } else {
+ Diag(Tok.getLocation(), diag::err_expected_ident);
+ return DeclPtrTy();
+ }
+
+ TemplateParamsTy *ParamList =
+ Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
+ TemplateLoc, LAngleLoc,
+ &TemplateParams[0],
+ TemplateParams.size(),
+ RAngleLoc);
+
+ Parser::DeclPtrTy Param
+ = Actions.ActOnTemplateTemplateParameter(CurScope, TemplateLoc,
+ ParamList, ParamName,
+ NameLoc, Depth, Position);
+
+ // Get the a default value, if given.
+ if (Tok.is(tok::equal)) {
+ SourceLocation EqualLoc = ConsumeToken();
+ ParsedTemplateArgument Default = ParseTemplateTemplateArgument();
+ if (Default.isInvalid()) {
+ Diag(Tok.getLocation(),
+ diag::err_default_template_template_parameter_not_template);
+ static const tok::TokenKind EndToks[] = {
+ tok::comma, tok::greater, tok::greatergreater
+ };
+ SkipUntil(EndToks, 3, true, true);
+ return Param;
+ } else if (Param)
+ Actions.ActOnTemplateTemplateParameterDefault(Param, EqualLoc, Default);
+ }
+
+ return Param;
+}
+
+/// ParseNonTypeTemplateParameter - Handle the parsing of non-type
+/// template parameters (e.g., in "template<int Size> class array;").
+///
+/// template-parameter:
+/// ...
+/// parameter-declaration
+///
+/// NOTE: It would be ideal to simply call out to ParseParameterDeclaration(),
+/// but that didn't work out to well. Instead, this tries to recrate the basic
+/// parsing of parameter declarations, but tries to constrain it for template
+/// parameters.
+/// FIXME: We need to make a ParseParameterDeclaration that works for
+/// non-type template parameters and normal function parameters.
+Parser::DeclPtrTy
+Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
+ SourceLocation StartLoc = Tok.getLocation();
+
+ // Parse the declaration-specifiers (i.e., the type).
+ // FIXME: The type should probably be restricted in some way... Not all
+ // declarators (parts of declarators?) are accepted for parameters.
+ DeclSpec DS;
+ ParseDeclarationSpecifiers(DS);
+
+ // Parse this as a typename.
+ Declarator ParamDecl(DS, Declarator::TemplateParamContext);
+ ParseDeclarator(ParamDecl);
+ if (DS.getTypeSpecType() == DeclSpec::TST_unspecified && !DS.getTypeRep()) {
+ // This probably shouldn't happen - and it's more of a Sema thing, but
+ // basically we didn't parse the type name because we couldn't associate
+ // it with an AST node. we should just skip to the comma or greater.
+ // TODO: This is currently a placeholder for some kind of Sema Error.
+ Diag(Tok.getLocation(), diag::err_parse_error);
+ SkipUntil(tok::comma, tok::greater, true, true);
+ return DeclPtrTy();
+ }
+
+ // Create the parameter.
+ DeclPtrTy Param = Actions.ActOnNonTypeTemplateParameter(CurScope, ParamDecl,
+ Depth, Position);
+
+ // If there is a default value, parse it.
+ if (Tok.is(tok::equal)) {
+ SourceLocation EqualLoc = ConsumeToken();
+
+ // C++ [temp.param]p15:
+ // When parsing a default template-argument for a non-type
+ // template-parameter, the first non-nested > is taken as the
+ // end of the template-parameter-list rather than a greater-than
+ // operator.
+ GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
+
+ OwningExprResult DefaultArg = ParseAssignmentExpression();
+ if (DefaultArg.isInvalid())
+ SkipUntil(tok::comma, tok::greater, true, true);
+ else if (Param)
+ Actions.ActOnNonTypeTemplateParameterDefault(Param, EqualLoc,
+ move(DefaultArg));
+ }
+
+ return Param;
+}
+
+/// \brief Parses a template-id that after the template name has
+/// already been parsed.
+///
+/// This routine takes care of parsing the enclosed template argument
+/// list ('<' template-parameter-list [opt] '>') and placing the
+/// results into a form that can be transferred to semantic analysis.
+///
+/// \param Template the template declaration produced by isTemplateName
+///
+/// \param TemplateNameLoc the source location of the template name
+///
+/// \param SS if non-NULL, the nested-name-specifier preceding the
+/// template name.
+///
+/// \param ConsumeLastToken if true, then we will consume the last
+/// token that forms the template-id. Otherwise, we will leave the
+/// last token in the stream (e.g., so that it can be replaced with an
+/// annotation token).
+bool
+Parser::ParseTemplateIdAfterTemplateName(TemplateTy Template,
+ SourceLocation TemplateNameLoc,
+ const CXXScopeSpec *SS,
+ bool ConsumeLastToken,
+ SourceLocation &LAngleLoc,
+ TemplateArgList &TemplateArgs,
+ SourceLocation &RAngleLoc) {
+ assert(Tok.is(tok::less) && "Must have already parsed the template-name");
+
+ // Consume the '<'.
+ LAngleLoc = ConsumeToken();
+
+ // Parse the optional template-argument-list.
+ bool Invalid = false;
+ {
+ GreaterThanIsOperatorScope G(GreaterThanIsOperator, false);
+ if (Tok.isNot(tok::greater))
+ Invalid = ParseTemplateArgumentList(TemplateArgs);
+
+ if (Invalid) {
+ // Try to find the closing '>'.
+ SkipUntil(tok::greater, true, !ConsumeLastToken);
+
+ return true;
+ }
+ }
+
+ if (Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater)) {
+ Diag(Tok.getLocation(), diag::err_expected_greater);
+ return true;
+ }
+
+ // Determine the location of the '>' or '>>'. Only consume this
+ // token if the caller asked us to.
+ RAngleLoc = Tok.getLocation();
+
+ if (Tok.is(tok::greatergreater)) {
+ if (!getLang().CPlusPlus0x) {
+ const char *ReplaceStr = "> >";
+ if (NextToken().is(tok::greater) || NextToken().is(tok::greatergreater))
+ ReplaceStr = "> > ";
+
+ Diag(Tok.getLocation(), diag::err_two_right_angle_brackets_need_space)
+ << CodeModificationHint::CreateReplacement(
+ SourceRange(Tok.getLocation()), ReplaceStr);
+ }
+
+ Tok.setKind(tok::greater);
+ if (!ConsumeLastToken) {
+ // Since we're not supposed to consume the '>>' token, we need
+ // to insert a second '>' token after the first.
+ PP.EnterToken(Tok);
+ }
+ } else if (ConsumeLastToken)
+ ConsumeToken();
+
+ return false;
+}
+
+/// \brief Replace the tokens that form a simple-template-id with an
+/// annotation token containing the complete template-id.
+///
+/// The first token in the stream must be the name of a template that
+/// is followed by a '<'. This routine will parse the complete
+/// simple-template-id and replace the tokens with a single annotation
+/// token with one of two different kinds: if the template-id names a
+/// type (and \p AllowTypeAnnotation is true), the annotation token is
+/// a type annotation that includes the optional nested-name-specifier
+/// (\p SS). Otherwise, the annotation token is a template-id
+/// annotation that does not include the optional
+/// nested-name-specifier.
+///
+/// \param Template the declaration of the template named by the first
+/// token (an identifier), as returned from \c Action::isTemplateName().
+///
+/// \param TemplateNameKind the kind of template that \p Template
+/// refers to, as returned from \c Action::isTemplateName().
+///
+/// \param SS if non-NULL, the nested-name-specifier that precedes
+/// this template name.
+///
+/// \param TemplateKWLoc if valid, specifies that this template-id
+/// annotation was preceded by the 'template' keyword and gives the
+/// location of that keyword. If invalid (the default), then this
+/// template-id was not preceded by a 'template' keyword.
+///
+/// \param AllowTypeAnnotation if true (the default), then a
+/// simple-template-id that refers to a class template, template
+/// template parameter, or other template that produces a type will be
+/// replaced with a type annotation token. Otherwise, the
+/// simple-template-id is always replaced with a template-id
+/// annotation token.
+///
+/// If an unrecoverable parse error occurs and no annotation token can be
+/// formed, this function returns true.
+///
+bool Parser::AnnotateTemplateIdToken(TemplateTy Template, TemplateNameKind TNK,
+ const CXXScopeSpec *SS,
+ UnqualifiedId &TemplateName,
+ SourceLocation TemplateKWLoc,
+ bool AllowTypeAnnotation) {
+ assert(getLang().CPlusPlus && "Can only annotate template-ids in C++");
+ assert(Template && Tok.is(tok::less) &&
+ "Parser isn't at the beginning of a template-id");
+
+ // Consume the template-name.
+ SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
+
+ // Parse the enclosed template argument list.
+ SourceLocation LAngleLoc, RAngleLoc;
+ TemplateArgList TemplateArgs;
+ bool Invalid = ParseTemplateIdAfterTemplateName(Template,
+ TemplateNameLoc,
+ SS, false, LAngleLoc,
+ TemplateArgs,
+ RAngleLoc);
+
+ if (Invalid) {
+ // If we failed to parse the template ID but skipped ahead to a >, we're not
+ // going to be able to form a token annotation. Eat the '>' if present.
+ if (Tok.is(tok::greater))
+ ConsumeToken();
+ return true;
+ }
+
+ ASTTemplateArgsPtr TemplateArgsPtr(Actions, TemplateArgs.data(),
+ TemplateArgs.size());
+
+ // Build the annotation token.
+ if (TNK == TNK_Type_template && AllowTypeAnnotation) {
+ Action::TypeResult Type
+ = Actions.ActOnTemplateIdType(Template, TemplateNameLoc,
+ LAngleLoc, TemplateArgsPtr,
+ RAngleLoc);
+ if (Type.isInvalid()) {
+ // If we failed to parse the template ID but skipped ahead to a >, we're not
+ // going to be able to form a token annotation. Eat the '>' if present.
+ if (Tok.is(tok::greater))
+ ConsumeToken();
+ return true;
+ }
+
+ Tok.setKind(tok::annot_typename);
+ Tok.setAnnotationValue(Type.get());
+ if (SS && SS->isNotEmpty())
+ Tok.setLocation(SS->getBeginLoc());
+ else if (TemplateKWLoc.isValid())
+ Tok.setLocation(TemplateKWLoc);
+ else
+ Tok.setLocation(TemplateNameLoc);
+ } else {
+ // Build a template-id annotation token that can be processed
+ // later.
+ Tok.setKind(tok::annot_template_id);
+ TemplateIdAnnotation *TemplateId
+ = TemplateIdAnnotation::Allocate(TemplateArgs.size());
+ TemplateId->TemplateNameLoc = TemplateNameLoc;
+ if (TemplateName.getKind() == UnqualifiedId::IK_Identifier) {
+ TemplateId->Name = TemplateName.Identifier;
+ TemplateId->Operator = OO_None;
+ } else {
+ TemplateId->Name = 0;
+ TemplateId->Operator = TemplateName.OperatorFunctionId.Operator;
+ }
+ TemplateId->Template = Template.getAs<void*>();
+ TemplateId->Kind = TNK;
+ TemplateId->LAngleLoc = LAngleLoc;
+ TemplateId->RAngleLoc = RAngleLoc;
+ ParsedTemplateArgument *Args = TemplateId->getTemplateArgs();
+ for (unsigned Arg = 0, ArgEnd = TemplateArgs.size(); Arg != ArgEnd; ++Arg)
+ Args[Arg] = TemplateArgs[Arg];
+ Tok.setAnnotationValue(TemplateId);
+ if (TemplateKWLoc.isValid())
+ Tok.setLocation(TemplateKWLoc);
+ else
+ Tok.setLocation(TemplateNameLoc);
+
+ TemplateArgsPtr.release();
+ }
+
+ // Common fields for the annotation token
+ Tok.setAnnotationEndLoc(RAngleLoc);
+
+ // In case the tokens were cached, have Preprocessor replace them with the
+ // annotation token.
+ PP.AnnotateCachedTokens(Tok);
+ return false;
+}
+
+/// \brief Replaces a template-id annotation token with a type
+/// annotation token.
+///
+/// If there was a failure when forming the type from the template-id,
+/// a type annotation token will still be created, but will have a
+/// NULL type pointer to signify an error.
+void Parser::AnnotateTemplateIdTokenAsType(const CXXScopeSpec *SS) {
+ assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
+
+ TemplateIdAnnotation *TemplateId
+ = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
+ assert((TemplateId->Kind == TNK_Type_template ||
+ TemplateId->Kind == TNK_Dependent_template_name) &&
+ "Only works for type and dependent templates");
+
+ ASTTemplateArgsPtr TemplateArgsPtr(Actions,
+ TemplateId->getTemplateArgs(),
+ TemplateId->NumArgs);
+
+ Action::TypeResult Type
+ = Actions.ActOnTemplateIdType(TemplateTy::make(TemplateId->Template),
+ TemplateId->TemplateNameLoc,
+ TemplateId->LAngleLoc,
+ TemplateArgsPtr,
+ TemplateId->RAngleLoc);
+ // Create the new "type" annotation token.
+ Tok.setKind(tok::annot_typename);
+ Tok.setAnnotationValue(Type.isInvalid()? 0 : Type.get());
+ if (SS && SS->isNotEmpty()) // it was a C++ qualified type name.
+ Tok.setLocation(SS->getBeginLoc());
+ // End location stays the same
+
+ // Replace the template-id annotation token, and possible the scope-specifier
+ // that precedes it, with the typename annotation token.
+ PP.AnnotateCachedTokens(Tok);
+ TemplateId->Destroy();
+}
+
+/// \brief Determine whether the given token can end a template argument.
+static bool isEndOfTemplateArgument(Token Tok) {
+ return Tok.is(tok::comma) || Tok.is(tok::greater) ||
+ Tok.is(tok::greatergreater);
+}
+
+/// \brief Parse a C++ template template argument.
+ParsedTemplateArgument Parser::ParseTemplateTemplateArgument() {
+ if (!Tok.is(tok::identifier) && !Tok.is(tok::coloncolon) &&
+ !Tok.is(tok::annot_cxxscope))
+ return ParsedTemplateArgument();
+
+ // C++0x [temp.arg.template]p1:
+ // A template-argument for a template template-parameter shall be the name
+ // of a class template or a template alias, expressed as id-expression.
+ //
+ // We parse an id-expression that refers to a class template or template
+ // alias. The grammar we parse is:
+ //
+ // nested-name-specifier[opt] template[opt] identifier
+ //
+ // followed by a token that terminates a template argument, such as ',',
+ // '>', or (in some cases) '>>'.
+ CXXScopeSpec SS; // nested-name-specifier, if present
+ ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0,
+ /*EnteringContext=*/false);
+
+ if (SS.isSet() && Tok.is(tok::kw_template)) {
+ // Parse the optional 'template' keyword following the
+ // nested-name-specifier.
+ SourceLocation TemplateLoc = ConsumeToken();
+
+ if (Tok.is(tok::identifier)) {
+ // We appear to have a dependent template name.
+ UnqualifiedId Name;
+ Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
+ ConsumeToken(); // the identifier
+
+ // If the next token signals the end of a template argument,
+ // then we have a dependent template name that could be a template
+ // template argument.
+ if (isEndOfTemplateArgument(Tok)) {
+ TemplateTy Template
+ = Actions.ActOnDependentTemplateName(TemplateLoc, SS, Name,
+ /*ObjectType=*/0,
+ /*EnteringContext=*/false);
+ if (Template.get())
+ return ParsedTemplateArgument(SS, Template, Name.StartLocation);
+ }
+ }
+ } else if (Tok.is(tok::identifier)) {
+ // We may have a (non-dependent) template name.
+ TemplateTy Template;
+ UnqualifiedId Name;
+ Name.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
+ ConsumeToken(); // the identifier
+
+ if (isEndOfTemplateArgument(Tok)) {
+ TemplateNameKind TNK = Actions.isTemplateName(CurScope, SS, Name,
+ /*ObjectType=*/0,
+ /*EnteringContext=*/false,
+ Template);
+ if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
+ // We have an id-expression that refers to a class template or
+ // (C++0x) template alias.
+ return ParsedTemplateArgument(SS, Template, Name.StartLocation);
+ }
+ }
+ }
+
+ // We don't have a template template argument.
+ return ParsedTemplateArgument();
+}
+
+/// ParseTemplateArgument - Parse a C++ template argument (C++ [temp.names]).
+///
+/// template-argument: [C++ 14.2]
+/// constant-expression
+/// type-id
+/// id-expression
+ParsedTemplateArgument Parser::ParseTemplateArgument() {
+ // C++ [temp.arg]p2:
+ // In a template-argument, an ambiguity between a type-id and an
+ // expression is resolved to a type-id, regardless of the form of
+ // the corresponding template-parameter.
+ //
+ // Therefore, we initially try to parse a type-id.
+ if (isCXXTypeId(TypeIdAsTemplateArgument)) {
+ SourceLocation Loc = Tok.getLocation();
+ TypeResult TypeArg = ParseTypeName();
+ if (TypeArg.isInvalid())
+ return ParsedTemplateArgument();
+
+ return ParsedTemplateArgument(ParsedTemplateArgument::Type, TypeArg.get(),
+ Loc);
+ }
+
+ // Try to parse a template template argument.
+ {
+ TentativeParsingAction TPA(*this);
+
+ ParsedTemplateArgument TemplateTemplateArgument
+ = ParseTemplateTemplateArgument();
+ if (!TemplateTemplateArgument.isInvalid()) {
+ TPA.Commit();
+ return TemplateTemplateArgument;
+ }
+
+ // Revert this tentative parse to parse a non-type template argument.
+ TPA.Revert();
+ }
+
+ // Parse a non-type template argument.
+ SourceLocation Loc = Tok.getLocation();
+ OwningExprResult ExprArg = ParseConstantExpression();
+ if (ExprArg.isInvalid() || !ExprArg.get())
+ return ParsedTemplateArgument();
+
+ return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
+ ExprArg.release(), Loc);
+}
+
+/// ParseTemplateArgumentList - Parse a C++ template-argument-list
+/// (C++ [temp.names]). Returns true if there was an error.
+///
+/// template-argument-list: [C++ 14.2]
+/// template-argument
+/// template-argument-list ',' template-argument
+bool
+Parser::ParseTemplateArgumentList(TemplateArgList &TemplateArgs) {
+ while (true) {
+ ParsedTemplateArgument Arg = ParseTemplateArgument();
+ if (Arg.isInvalid()) {
+ SkipUntil(tok::comma, tok::greater, true, true);
+ return true;
+ }
+
+ // Save this template argument.
+ TemplateArgs.push_back(Arg);
+
+ // If the next token is a comma, consume it and keep reading
+ // arguments.
+ if (Tok.isNot(tok::comma)) break;
+
+ // Consume the comma.
+ ConsumeToken();
+ }
+
+ return false;
+}
+
+/// \brief Parse a C++ explicit template instantiation
+/// (C++ [temp.explicit]).
+///
+/// explicit-instantiation:
+/// 'extern' [opt] 'template' declaration
+///
+/// Note that the 'extern' is a GNU extension and C++0x feature.
+Parser::DeclPtrTy
+Parser::ParseExplicitInstantiation(SourceLocation ExternLoc,
+ SourceLocation TemplateLoc,
+ SourceLocation &DeclEnd) {
+ return ParseSingleDeclarationAfterTemplate(Declarator::FileContext,
+ ParsedTemplateInfo(ExternLoc,
+ TemplateLoc),
+ DeclEnd, AS_none);
+}