976 lines
36 KiB
C++
976 lines
36 KiB
C++
//===--- 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 "llvm/Support/Compiler.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 VISIBILITY_HIDDEN 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);
|
|
ParseDeclarationSpecifiers(DS, TemplateInfo, AS);
|
|
|
|
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;
|
|
}
|
|
|
|
/// 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 (Tok.is(tok::kw_class) ||
|
|
(Tok.is(tok::kw_typename) &&
|
|
// FIXME: Next token has not been annotated!
|
|
NextToken().isNot(tok::annot_typename))) {
|
|
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 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))
|
|
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());
|
|
Tok.setAnnotationEndLoc(TemplateId->TemplateNameLoc);
|
|
|
|
// 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);
|
|
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 Tok.isNot(tok::greater) && Tok.isNot(tok::greatergreater);
|
|
}
|
|
|
|
/// \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);
|
|
}
|