1379 lines
53 KiB
C++
1379 lines
53 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 "RAIIObjectsForParser.h"
|
|
#include "clang/AST/ASTConsumer.h"
|
|
#include "clang/AST/DeclTemplate.h"
|
|
#include "clang/Parse/ParseDiagnostic.h"
|
|
#include "clang/Sema/DeclSpec.h"
|
|
#include "clang/Sema/ParsedTemplate.h"
|
|
#include "clang/Sema/Scope.h"
|
|
using namespace clang;
|
|
|
|
/// \brief Parse a template declaration, explicit instantiation, or
|
|
/// explicit specialization.
|
|
Decl *
|
|
Parser::ParseDeclarationStartingWithTemplate(unsigned Context,
|
|
SourceLocation &DeclEnd,
|
|
AccessSpecifier AS,
|
|
AttributeList *AccessAttrs) {
|
|
ObjCDeclContextSwitch ObjCDC(*this);
|
|
|
|
if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
|
|
return ParseExplicitInstantiation(Context,
|
|
SourceLocation(), ConsumeToken(),
|
|
DeclEnd, AS);
|
|
}
|
|
return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AS,
|
|
AccessAttrs);
|
|
}
|
|
|
|
|
|
|
|
/// \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
|
|
Decl *
|
|
Parser::ParseTemplateDeclarationOrSpecialization(unsigned Context,
|
|
SourceLocation &DeclEnd,
|
|
AccessSpecifier AS,
|
|
AttributeList *AccessAttrs) {
|
|
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);
|
|
|
|
// Tell the action that names should be checked in the context of
|
|
// the declaration to come.
|
|
ParsingDeclRAIIObject
|
|
ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
|
|
|
|
// 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;
|
|
TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
|
|
|
|
do {
|
|
// Consume the 'export', if any.
|
|
SourceLocation ExportLoc;
|
|
TryConsumeToken(tok::kw_export, ExportLoc);
|
|
|
|
// Consume the 'template', which should be here.
|
|
SourceLocation TemplateLoc;
|
|
if (!TryConsumeToken(tok::kw_template, TemplateLoc)) {
|
|
Diag(Tok.getLocation(), diag::err_expected_template);
|
|
return nullptr;
|
|
}
|
|
|
|
// Parse the '<' template-parameter-list '>'
|
|
SourceLocation LAngleLoc, RAngleLoc;
|
|
SmallVector<Decl*, 4> TemplateParams;
|
|
if (ParseTemplateParameters(CurTemplateDepthTracker.getDepth(),
|
|
TemplateParams, LAngleLoc, RAngleLoc)) {
|
|
// Skip until the semi-colon or a }.
|
|
SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
|
|
TryConsumeToken(tok::semi);
|
|
return nullptr;
|
|
}
|
|
|
|
ParamLists.push_back(
|
|
Actions.ActOnTemplateParameterList(CurTemplateDepthTracker.getDepth(),
|
|
ExportLoc,
|
|
TemplateLoc, LAngleLoc,
|
|
TemplateParams.data(),
|
|
TemplateParams.size(), RAngleLoc));
|
|
|
|
if (!TemplateParams.empty()) {
|
|
isSpecialization = false;
|
|
++CurTemplateDepthTracker;
|
|
} 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),
|
|
ParsingTemplateParams,
|
|
DeclEnd, AS, AccessAttrs);
|
|
}
|
|
|
|
/// \brief Parse a single declaration that declares a template,
|
|
/// template specialization, or explicit instantiation of a template.
|
|
///
|
|
/// \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.
|
|
Decl *
|
|
Parser::ParseSingleDeclarationAfterTemplate(
|
|
unsigned Context,
|
|
const ParsedTemplateInfo &TemplateInfo,
|
|
ParsingDeclRAIIObject &DiagsFromTParams,
|
|
SourceLocation &DeclEnd,
|
|
AccessSpecifier AS,
|
|
AttributeList *AccessAttrs) {
|
|
assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
|
|
"Template information required");
|
|
|
|
if (Context == Declarator::MemberContext) {
|
|
// We are parsing a member template.
|
|
ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
|
|
&DiagsFromTParams);
|
|
return nullptr;
|
|
}
|
|
|
|
ParsedAttributesWithRange prefixAttrs(AttrFactory);
|
|
MaybeParseCXX11Attributes(prefixAttrs);
|
|
|
|
if (Tok.is(tok::kw_using))
|
|
return ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
|
|
prefixAttrs);
|
|
|
|
// Parse the declaration specifiers, stealing any diagnostics from
|
|
// the template parameters.
|
|
ParsingDeclSpec DS(*this, &DiagsFromTParams);
|
|
|
|
ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
|
|
getDeclSpecContextFromDeclaratorContext(Context));
|
|
|
|
if (Tok.is(tok::semi)) {
|
|
ProhibitAttributes(prefixAttrs);
|
|
DeclEnd = ConsumeToken();
|
|
Decl *Decl = Actions.ParsedFreeStandingDeclSpec(
|
|
getCurScope(), AS, DS,
|
|
TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
|
|
: MultiTemplateParamsArg(),
|
|
TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation);
|
|
DS.complete(Decl);
|
|
return Decl;
|
|
}
|
|
|
|
// Move the attributes from the prefix into the DS.
|
|
if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
|
|
ProhibitAttributes(prefixAttrs);
|
|
else
|
|
DS.takeAttributesFrom(prefixAttrs);
|
|
|
|
// 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, StopAtSemi | StopBeforeMatch);
|
|
if (Tok.is(tok::semi))
|
|
ConsumeToken();
|
|
return nullptr;
|
|
}
|
|
|
|
LateParsedAttrList LateParsedAttrs(true);
|
|
if (DeclaratorInfo.isFunctionDeclarator())
|
|
MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
|
|
|
|
if (DeclaratorInfo.isFunctionDeclarator() &&
|
|
isStartOfFunctionDefinition(DeclaratorInfo)) {
|
|
if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
|
|
// Recover by ignoring the 'typedef'. This was probably supposed to be
|
|
// the 'typename' keyword, which we should have already suggested adding
|
|
// if it's appropriate.
|
|
Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
|
|
<< FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
|
|
DS.ClearStorageClassSpecs();
|
|
}
|
|
|
|
if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
|
|
if (DeclaratorInfo.getName().getKind() != UnqualifiedId::IK_TemplateId) {
|
|
// If the declarator-id is not a template-id, issue a diagnostic and
|
|
// recover by ignoring the 'template' keyword.
|
|
Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
|
|
return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
|
|
&LateParsedAttrs);
|
|
} else {
|
|
SourceLocation LAngleLoc
|
|
= PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
|
|
Diag(DeclaratorInfo.getIdentifierLoc(),
|
|
diag::err_explicit_instantiation_with_definition)
|
|
<< SourceRange(TemplateInfo.TemplateLoc)
|
|
<< FixItHint::CreateInsertion(LAngleLoc, "<>");
|
|
|
|
// Recover as if it were an explicit specialization.
|
|
TemplateParameterLists FakedParamLists;
|
|
FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
|
|
0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, nullptr,
|
|
0, LAngleLoc));
|
|
|
|
return ParseFunctionDefinition(
|
|
DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
|
|
/*isSpecialization=*/true,
|
|
/*LastParamListWasEmpty=*/true),
|
|
&LateParsedAttrs);
|
|
}
|
|
}
|
|
return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
|
|
&LateParsedAttrs);
|
|
}
|
|
|
|
// Parse this declaration.
|
|
Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
|
|
TemplateInfo);
|
|
|
|
if (Tok.is(tok::comma)) {
|
|
Diag(Tok, diag::err_multiple_template_declarators)
|
|
<< (int)TemplateInfo.Kind;
|
|
SkipUntil(tok::semi);
|
|
return ThisDecl;
|
|
}
|
|
|
|
// Eat the semi colon after the declaration.
|
|
ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
|
|
if (LateParsedAttrs.size() > 0)
|
|
ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
|
|
DeclaratorInfo.complete(ThisDecl);
|
|
return ThisDecl;
|
|
}
|
|
|
|
/// 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,
|
|
SmallVectorImpl<Decl*> &TemplateParams,
|
|
SourceLocation &LAngleLoc,
|
|
SourceLocation &RAngleLoc) {
|
|
// Get the template parameter list.
|
|
if (!TryConsumeToken(tok::less, LAngleLoc)) {
|
|
Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
|
|
return true;
|
|
}
|
|
|
|
// Try to parse the template parameter list.
|
|
bool Failed = false;
|
|
if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater))
|
|
Failed = ParseTemplateParameterList(Depth, TemplateParams);
|
|
|
|
if (Tok.is(tok::greatergreater)) {
|
|
// No diagnostic required here: a template-parameter-list can only be
|
|
// followed by a declaration or, for a template template parameter, the
|
|
// 'class' keyword. Therefore, the second '>' will be diagnosed later.
|
|
// This matters for elegant diagnosis of:
|
|
// template<template<typename>> struct S;
|
|
Tok.setKind(tok::greater);
|
|
RAngleLoc = Tok.getLocation();
|
|
Tok.setLocation(Tok.getLocation().getLocWithOffset(1));
|
|
} else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
|
|
Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
|
|
return true;
|
|
}
|
|
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,
|
|
SmallVectorImpl<Decl*> &TemplateParams) {
|
|
while (1) {
|
|
if (Decl *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, tok::greatergreater,
|
|
StopAtSemi | StopBeforeMatch);
|
|
}
|
|
|
|
// Did we find a comma or the end of the template parameter list?
|
|
if (Tok.is(tok::comma)) {
|
|
ConsumeToken();
|
|
} else if (Tok.is(tok::greater) || Tok.is(tok::greatergreater)) {
|
|
// 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.
|
|
Diag(Tok.getLocation(), diag::err_expected_comma_greater);
|
|
SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
StopAtSemi | StopBeforeMatch);
|
|
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)) {
|
|
// "class" may be the start of an elaborated-type-specifier or a
|
|
// type-parameter. Per C++ [temp.param]p3, we prefer the type-parameter.
|
|
switch (NextToken().getKind()) {
|
|
case tok::equal:
|
|
case tok::comma:
|
|
case tok::greater:
|
|
case tok::greatergreater:
|
|
case tok::ellipsis:
|
|
return true;
|
|
|
|
case tok::identifier:
|
|
// This may be either a type-parameter or an elaborated-type-specifier.
|
|
// We have to look further.
|
|
break;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
switch (GetLookAheadToken(2).getKind()) {
|
|
case tok::equal:
|
|
case tok::comma:
|
|
case tok::greater:
|
|
case tok::greatergreater:
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
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] identifier[opt]
|
|
/// 'class' identifier[opt] '=' type-id
|
|
/// 'typename' ...[opt] identifier[opt]
|
|
/// 'typename' identifier[opt] '=' type-id
|
|
/// 'template' '<' template-parameter-list '>'
|
|
/// 'class' ...[opt] identifier[opt]
|
|
/// 'template' '<' template-parameter-list '>' 'class' identifier[opt]
|
|
/// = id-expression
|
|
Decl *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
|
|
Decl *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).
|
|
SourceLocation EllipsisLoc;
|
|
if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
|
|
Diag(EllipsisLoc,
|
|
getLangOpts().CPlusPlus11
|
|
? diag::warn_cxx98_compat_variadic_templates
|
|
: diag::ext_variadic_templates);
|
|
}
|
|
|
|
// Grab the template parameter name (if given)
|
|
SourceLocation NameLoc;
|
|
IdentifierInfo *ParamName = nullptr;
|
|
if (Tok.is(tok::identifier)) {
|
|
ParamName = Tok.getIdentifierInfo();
|
|
NameLoc = ConsumeToken();
|
|
} else if (Tok.is(tok::equal) || Tok.is(tok::comma) ||
|
|
Tok.is(tok::greater) || Tok.is(tok::greatergreater)) {
|
|
// Unnamed template parameter. Don't have to do anything here, just
|
|
// don't consume this token.
|
|
} else {
|
|
Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
|
|
return nullptr;
|
|
}
|
|
|
|
// Recover from misplaced ellipsis.
|
|
bool AlreadyHasEllipsis = EllipsisLoc.isValid();
|
|
if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
|
|
|
|
// Grab a default argument (if available).
|
|
// Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
// we introduce the type parameter into the local scope.
|
|
SourceLocation EqualLoc;
|
|
ParsedType DefaultArg;
|
|
if (TryConsumeToken(tok::equal, EqualLoc))
|
|
DefaultArg = ParseTypeName(/*Range=*/nullptr,
|
|
Declarator::TemplateTypeArgContext).get();
|
|
|
|
return Actions.ActOnTypeParameter(getCurScope(), TypenameKeyword, EllipsisLoc,
|
|
KeyLoc, ParamName, NameLoc, Depth, Position,
|
|
EqualLoc, DefaultArg);
|
|
}
|
|
|
|
/// ParseTemplateTemplateParameter - Handle the parsing of template
|
|
/// template parameters.
|
|
///
|
|
/// type-parameter: [C++ temp.param]
|
|
/// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
/// ...[opt] identifier[opt]
|
|
/// 'template' '<' template-parameter-list '>' type-parameter-key
|
|
/// identifier[opt] = id-expression
|
|
/// type-parameter-key:
|
|
/// 'class'
|
|
/// 'typename' [C++1z]
|
|
Decl *
|
|
Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
|
|
assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
|
|
|
|
// Handle the template <...> part.
|
|
SourceLocation TemplateLoc = ConsumeToken();
|
|
SmallVector<Decl*,8> TemplateParams;
|
|
SourceLocation LAngleLoc, RAngleLoc;
|
|
{
|
|
ParseScope TemplateParmScope(this, Scope::TemplateParamScope);
|
|
if (ParseTemplateParameters(Depth + 1, TemplateParams, LAngleLoc,
|
|
RAngleLoc)) {
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
// Provide an ExtWarn if the C++1z feature of using 'typename' here is used.
|
|
// Generate a meaningful error if the user forgot to put class before the
|
|
// identifier, comma, or greater. Provide a fixit if the identifier, comma,
|
|
// or greater appear immediately or after 'struct'. In the latter case,
|
|
// replace the keyword with 'class'.
|
|
if (!TryConsumeToken(tok::kw_class)) {
|
|
bool Replace = Tok.is(tok::kw_typename) || Tok.is(tok::kw_struct);
|
|
const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
|
|
if (Tok.is(tok::kw_typename)) {
|
|
Diag(Tok.getLocation(),
|
|
getLangOpts().CPlusPlus1z
|
|
? diag::warn_cxx1y_compat_template_template_param_typename
|
|
: diag::ext_template_template_param_typename)
|
|
<< (!getLangOpts().CPlusPlus1z
|
|
? FixItHint::CreateReplacement(Tok.getLocation(), "class")
|
|
: FixItHint());
|
|
} else if (Next.is(tok::identifier) || Next.is(tok::comma) ||
|
|
Next.is(tok::greater) || Next.is(tok::greatergreater) ||
|
|
Next.is(tok::ellipsis)) {
|
|
Diag(Tok.getLocation(), diag::err_class_on_template_template_param)
|
|
<< (Replace ? FixItHint::CreateReplacement(Tok.getLocation(), "class")
|
|
: FixItHint::CreateInsertion(Tok.getLocation(), "class "));
|
|
} else
|
|
Diag(Tok.getLocation(), diag::err_class_on_template_template_param);
|
|
|
|
if (Replace)
|
|
ConsumeToken();
|
|
}
|
|
|
|
// Parse the ellipsis, if given.
|
|
SourceLocation EllipsisLoc;
|
|
if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
Diag(EllipsisLoc,
|
|
getLangOpts().CPlusPlus11
|
|
? diag::warn_cxx98_compat_variadic_templates
|
|
: diag::ext_variadic_templates);
|
|
|
|
// Get the identifier, if given.
|
|
SourceLocation NameLoc;
|
|
IdentifierInfo *ParamName = nullptr;
|
|
if (Tok.is(tok::identifier)) {
|
|
ParamName = Tok.getIdentifierInfo();
|
|
NameLoc = ConsumeToken();
|
|
} else if (Tok.is(tok::equal) || Tok.is(tok::comma) ||
|
|
Tok.is(tok::greater) || Tok.is(tok::greatergreater)) {
|
|
// Unnamed template parameter. Don't have to do anything here, just
|
|
// don't consume this token.
|
|
} else {
|
|
Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
|
|
return nullptr;
|
|
}
|
|
|
|
// Recover from misplaced ellipsis.
|
|
bool AlreadyHasEllipsis = EllipsisLoc.isValid();
|
|
if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
DiagnoseMisplacedEllipsis(EllipsisLoc, NameLoc, AlreadyHasEllipsis, true);
|
|
|
|
TemplateParameterList *ParamList =
|
|
Actions.ActOnTemplateParameterList(Depth, SourceLocation(),
|
|
TemplateLoc, LAngleLoc,
|
|
TemplateParams.data(),
|
|
TemplateParams.size(),
|
|
RAngleLoc);
|
|
|
|
// Grab a default argument (if available).
|
|
// Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
// we introduce the template parameter into the local scope.
|
|
SourceLocation EqualLoc;
|
|
ParsedTemplateArgument DefaultArg;
|
|
if (TryConsumeToken(tok::equal, EqualLoc)) {
|
|
DefaultArg = ParseTemplateTemplateArgument();
|
|
if (DefaultArg.isInvalid()) {
|
|
Diag(Tok.getLocation(),
|
|
diag::err_default_template_template_parameter_not_template);
|
|
SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
StopAtSemi | StopBeforeMatch);
|
|
}
|
|
}
|
|
|
|
return Actions.ActOnTemplateTemplateParameter(getCurScope(), TemplateLoc,
|
|
ParamList, EllipsisLoc,
|
|
ParamName, NameLoc, Depth,
|
|
Position, EqualLoc, DefaultArg);
|
|
}
|
|
|
|
/// ParseNonTypeTemplateParameter - Handle the parsing of non-type
|
|
/// template parameters (e.g., in "template<int Size> class array;").
|
|
///
|
|
/// template-parameter:
|
|
/// ...
|
|
/// parameter-declaration
|
|
Decl *
|
|
Parser::ParseNonTypeTemplateParameter(unsigned Depth, unsigned Position) {
|
|
// 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(AttrFactory);
|
|
ParseDeclarationSpecifiers(DS);
|
|
|
|
// Parse this as a typename.
|
|
Declarator ParamDecl(DS, Declarator::TemplateParamContext);
|
|
ParseDeclarator(ParamDecl);
|
|
if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) {
|
|
Diag(Tok.getLocation(), diag::err_expected_template_parameter);
|
|
return nullptr;
|
|
}
|
|
|
|
// Recover from misplaced ellipsis.
|
|
SourceLocation EllipsisLoc;
|
|
if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, ParamDecl);
|
|
|
|
// If there is a default value, parse it.
|
|
// Per C++0x [basic.scope.pdecl]p9, we parse the default argument before
|
|
// we introduce the template parameter into the local scope.
|
|
SourceLocation EqualLoc;
|
|
ExprResult DefaultArg;
|
|
if (TryConsumeToken(tok::equal, EqualLoc)) {
|
|
// 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);
|
|
EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
|
|
|
|
DefaultArg = ParseAssignmentExpression();
|
|
if (DefaultArg.isInvalid())
|
|
SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
|
|
}
|
|
|
|
// Create the parameter.
|
|
return Actions.ActOnNonTypeTemplateParameter(getCurScope(), ParamDecl,
|
|
Depth, Position, EqualLoc,
|
|
DefaultArg.get());
|
|
}
|
|
|
|
void Parser::DiagnoseMisplacedEllipsis(SourceLocation EllipsisLoc,
|
|
SourceLocation CorrectLoc,
|
|
bool AlreadyHasEllipsis,
|
|
bool IdentifierHasName) {
|
|
FixItHint Insertion;
|
|
if (!AlreadyHasEllipsis)
|
|
Insertion = FixItHint::CreateInsertion(CorrectLoc, "...");
|
|
Diag(EllipsisLoc, diag::err_misplaced_ellipsis_in_declaration)
|
|
<< FixItHint::CreateRemoval(EllipsisLoc) << Insertion
|
|
<< !IdentifierHasName;
|
|
}
|
|
|
|
void Parser::DiagnoseMisplacedEllipsisInDeclarator(SourceLocation EllipsisLoc,
|
|
Declarator &D) {
|
|
assert(EllipsisLoc.isValid());
|
|
bool AlreadyHasEllipsis = D.getEllipsisLoc().isValid();
|
|
if (!AlreadyHasEllipsis)
|
|
D.setEllipsisLoc(EllipsisLoc);
|
|
DiagnoseMisplacedEllipsis(EllipsisLoc, D.getIdentifierLoc(),
|
|
AlreadyHasEllipsis, D.hasName());
|
|
}
|
|
|
|
/// \brief Parses a '>' at the end of a template list.
|
|
///
|
|
/// If this function encounters '>>', '>>>', '>=', or '>>=', it tries
|
|
/// to determine if these tokens were supposed to be a '>' followed by
|
|
/// '>', '>>', '>=', or '>='. It emits an appropriate diagnostic if necessary.
|
|
///
|
|
/// \param RAngleLoc the location of the consumed '>'.
|
|
///
|
|
/// \param ConsumeLastToken if true, the '>' is not consumed.
|
|
///
|
|
/// \returns true, if current token does not start with '>', false otherwise.
|
|
bool Parser::ParseGreaterThanInTemplateList(SourceLocation &RAngleLoc,
|
|
bool ConsumeLastToken) {
|
|
// What will be left once we've consumed the '>'.
|
|
tok::TokenKind RemainingToken;
|
|
const char *ReplacementStr = "> >";
|
|
|
|
switch (Tok.getKind()) {
|
|
default:
|
|
Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
|
|
return true;
|
|
|
|
case tok::greater:
|
|
// Determine the location of the '>' token. Only consume this token
|
|
// if the caller asked us to.
|
|
RAngleLoc = Tok.getLocation();
|
|
if (ConsumeLastToken)
|
|
ConsumeToken();
|
|
return false;
|
|
|
|
case tok::greatergreater:
|
|
RemainingToken = tok::greater;
|
|
break;
|
|
|
|
case tok::greatergreatergreater:
|
|
RemainingToken = tok::greatergreater;
|
|
break;
|
|
|
|
case tok::greaterequal:
|
|
RemainingToken = tok::equal;
|
|
ReplacementStr = "> =";
|
|
break;
|
|
|
|
case tok::greatergreaterequal:
|
|
RemainingToken = tok::greaterequal;
|
|
break;
|
|
}
|
|
|
|
// This template-id is terminated by a token which starts with a '>'. Outside
|
|
// C++11, this is now error recovery, and in C++11, this is error recovery if
|
|
// the token isn't '>>' or '>>>'.
|
|
// '>>>' is for CUDA, where this sequence of characters is parsed into
|
|
// tok::greatergreatergreater, rather than two separate tokens.
|
|
|
|
RAngleLoc = Tok.getLocation();
|
|
|
|
// The source range of the '>>' or '>=' at the start of the token.
|
|
CharSourceRange ReplacementRange =
|
|
CharSourceRange::getCharRange(RAngleLoc,
|
|
Lexer::AdvanceToTokenCharacter(RAngleLoc, 2, PP.getSourceManager(),
|
|
getLangOpts()));
|
|
|
|
// A hint to put a space between the '>>'s. In order to make the hint as
|
|
// clear as possible, we include the characters either side of the space in
|
|
// the replacement, rather than just inserting a space at SecondCharLoc.
|
|
FixItHint Hint1 = FixItHint::CreateReplacement(ReplacementRange,
|
|
ReplacementStr);
|
|
|
|
// A hint to put another space after the token, if it would otherwise be
|
|
// lexed differently.
|
|
FixItHint Hint2;
|
|
Token Next = NextToken();
|
|
if ((RemainingToken == tok::greater ||
|
|
RemainingToken == tok::greatergreater) &&
|
|
(Next.is(tok::greater) || Next.is(tok::greatergreater) ||
|
|
Next.is(tok::greatergreatergreater) || Next.is(tok::equal) ||
|
|
Next.is(tok::greaterequal) || Next.is(tok::greatergreaterequal) ||
|
|
Next.is(tok::equalequal)) &&
|
|
areTokensAdjacent(Tok, Next))
|
|
Hint2 = FixItHint::CreateInsertion(Next.getLocation(), " ");
|
|
|
|
unsigned DiagId = diag::err_two_right_angle_brackets_need_space;
|
|
if (getLangOpts().CPlusPlus11 &&
|
|
(Tok.is(tok::greatergreater) || Tok.is(tok::greatergreatergreater)))
|
|
DiagId = diag::warn_cxx98_compat_two_right_angle_brackets;
|
|
else if (Tok.is(tok::greaterequal))
|
|
DiagId = diag::err_right_angle_bracket_equal_needs_space;
|
|
Diag(Tok.getLocation(), DiagId) << Hint1 << Hint2;
|
|
|
|
// Strip the initial '>' from the token.
|
|
if (RemainingToken == tok::equal && Next.is(tok::equal) &&
|
|
areTokensAdjacent(Tok, Next)) {
|
|
// Join two adjacent '=' tokens into one, for cases like:
|
|
// void (*p)() = f<int>;
|
|
// return f<int>==p;
|
|
ConsumeToken();
|
|
Tok.setKind(tok::equalequal);
|
|
Tok.setLength(Tok.getLength() + 1);
|
|
} else {
|
|
Tok.setKind(RemainingToken);
|
|
Tok.setLength(Tok.getLength() - 1);
|
|
}
|
|
Tok.setLocation(Lexer::AdvanceToTokenCharacter(RAngleLoc, 1,
|
|
PP.getSourceManager(),
|
|
getLangOpts()));
|
|
|
|
if (!ConsumeLastToken) {
|
|
// Since we're not supposed to consume the '>' token, we need to push
|
|
// this token and revert the current token back to the '>'.
|
|
PP.EnterToken(Tok);
|
|
Tok.setKind(tok::greater);
|
|
Tok.setLength(1);
|
|
Tok.setLocation(RAngleLoc);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
|
|
/// \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) && Tok.isNot(tok::greatergreater))
|
|
Invalid = ParseTemplateArgumentList(TemplateArgs);
|
|
|
|
if (Invalid) {
|
|
// Try to find the closing '>'.
|
|
if (ConsumeLastToken)
|
|
SkipUntil(tok::greater, StopAtSemi);
|
|
else
|
|
SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return ParseGreaterThanInTemplateList(RAngleLoc, ConsumeLastToken);
|
|
}
|
|
|
|
/// \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 TNK 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,
|
|
CXXScopeSpec &SS,
|
|
SourceLocation TemplateKWLoc,
|
|
UnqualifiedId &TemplateName,
|
|
bool AllowTypeAnnotation) {
|
|
assert(getLangOpts().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.
|
|
TryConsumeToken(tok::greater);
|
|
return true;
|
|
}
|
|
|
|
ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
|
|
|
|
// Build the annotation token.
|
|
if (TNK == TNK_Type_template && AllowTypeAnnotation) {
|
|
TypeResult Type
|
|
= Actions.ActOnTemplateIdType(SS, TemplateKWLoc,
|
|
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.
|
|
TryConsumeToken(tok::greater);
|
|
return true;
|
|
}
|
|
|
|
Tok.setKind(tok::annot_typename);
|
|
setTypeAnnotation(Tok, Type.get());
|
|
if (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(), TemplateIds);
|
|
TemplateId->TemplateNameLoc = TemplateNameLoc;
|
|
if (TemplateName.getKind() == UnqualifiedId::IK_Identifier) {
|
|
TemplateId->Name = TemplateName.Identifier;
|
|
TemplateId->Operator = OO_None;
|
|
} else {
|
|
TemplateId->Name = nullptr;
|
|
TemplateId->Operator = TemplateName.OperatorFunctionId.Operator;
|
|
}
|
|
TemplateId->SS = SS;
|
|
TemplateId->TemplateKWLoc = TemplateKWLoc;
|
|
TemplateId->Template = Template;
|
|
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] = ParsedTemplateArgument(TemplateArgs[Arg]);
|
|
Tok.setAnnotationValue(TemplateId);
|
|
if (TemplateKWLoc.isValid())
|
|
Tok.setLocation(TemplateKWLoc);
|
|
else
|
|
Tok.setLocation(TemplateNameLoc);
|
|
}
|
|
|
|
// 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() {
|
|
assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
|
|
|
|
TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
|
|
assert((TemplateId->Kind == TNK_Type_template ||
|
|
TemplateId->Kind == TNK_Dependent_template_name) &&
|
|
"Only works for type and dependent templates");
|
|
|
|
ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
|
|
TemplateId->NumArgs);
|
|
|
|
TypeResult Type
|
|
= Actions.ActOnTemplateIdType(TemplateId->SS,
|
|
TemplateId->TemplateKWLoc,
|
|
TemplateId->Template,
|
|
TemplateId->TemplateNameLoc,
|
|
TemplateId->LAngleLoc,
|
|
TemplateArgsPtr,
|
|
TemplateId->RAngleLoc);
|
|
// Create the new "type" annotation token.
|
|
Tok.setKind(tok::annot_typename);
|
|
setTypeAnnotation(Tok, Type.isInvalid() ? ParsedType() : Type.get());
|
|
if (TemplateId->SS.isNotEmpty()) // it was a C++ qualified type name.
|
|
Tok.setLocation(TemplateId->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);
|
|
}
|
|
|
|
/// \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 an alias template, expressed as id-expression.
|
|
//
|
|
// We parse an id-expression that refers to a class template or alias
|
|
// template. The grammar we parse is:
|
|
//
|
|
// nested-name-specifier[opt] template[opt] identifier ...[opt]
|
|
//
|
|
// followed by a token that terminates a template argument, such as ',',
|
|
// '>', or (in some cases) '>>'.
|
|
CXXScopeSpec SS; // nested-name-specifier, if present
|
|
ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
|
|
/*EnteringContext=*/false);
|
|
|
|
ParsedTemplateArgument Result;
|
|
SourceLocation EllipsisLoc;
|
|
if (SS.isSet() && Tok.is(tok::kw_template)) {
|
|
// Parse the optional 'template' keyword following the
|
|
// nested-name-specifier.
|
|
SourceLocation TemplateKWLoc = 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
|
|
|
|
TryConsumeToken(tok::ellipsis, EllipsisLoc);
|
|
|
|
// 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.
|
|
TemplateTy Template;
|
|
if (isEndOfTemplateArgument(Tok) &&
|
|
Actions.ActOnDependentTemplateName(getCurScope(),
|
|
SS, TemplateKWLoc, Name,
|
|
/*ObjectType=*/ ParsedType(),
|
|
/*EnteringContext=*/false,
|
|
Template))
|
|
Result = 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
|
|
|
|
TryConsumeToken(tok::ellipsis, EllipsisLoc);
|
|
|
|
if (isEndOfTemplateArgument(Tok)) {
|
|
bool MemberOfUnknownSpecialization;
|
|
TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS,
|
|
/*hasTemplateKeyword=*/false,
|
|
Name,
|
|
/*ObjectType=*/ ParsedType(),
|
|
/*EnteringContext=*/false,
|
|
Template,
|
|
MemberOfUnknownSpecialization);
|
|
if (TNK == TNK_Dependent_template_name || TNK == TNK_Type_template) {
|
|
// We have an id-expression that refers to a class template or
|
|
// (C++0x) alias template.
|
|
Result = ParsedTemplateArgument(SS, Template, Name.StartLocation);
|
|
}
|
|
}
|
|
}
|
|
|
|
// If this is a pack expansion, build it as such.
|
|
if (EllipsisLoc.isValid() && !Result.isInvalid())
|
|
Result = Actions.ActOnPackExpansion(Result, EllipsisLoc);
|
|
|
|
return Result;
|
|
}
|
|
|
|
/// 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(/*Range=*/nullptr,
|
|
Declarator::TemplateTypeArgContext);
|
|
if (TypeArg.isInvalid())
|
|
return ParsedTemplateArgument();
|
|
|
|
return ParsedTemplateArgument(ParsedTemplateArgument::Type,
|
|
TypeArg.get().getAsOpaquePtr(),
|
|
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();
|
|
ExprResult ExprArg = ParseConstantExpression(MaybeTypeCast);
|
|
if (ExprArg.isInvalid() || !ExprArg.get())
|
|
return ParsedTemplateArgument();
|
|
|
|
return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
|
|
ExprArg.get(), Loc);
|
|
}
|
|
|
|
/// \brief Determine whether the current tokens can only be parsed as a
|
|
/// template argument list (starting with the '<') and never as a '<'
|
|
/// expression.
|
|
bool Parser::IsTemplateArgumentList(unsigned Skip) {
|
|
struct AlwaysRevertAction : TentativeParsingAction {
|
|
AlwaysRevertAction(Parser &P) : TentativeParsingAction(P) { }
|
|
~AlwaysRevertAction() { Revert(); }
|
|
} Tentative(*this);
|
|
|
|
while (Skip) {
|
|
ConsumeToken();
|
|
--Skip;
|
|
}
|
|
|
|
// '<'
|
|
if (!TryConsumeToken(tok::less))
|
|
return false;
|
|
|
|
// An empty template argument list.
|
|
if (Tok.is(tok::greater))
|
|
return true;
|
|
|
|
// See whether we have declaration specifiers, which indicate a type.
|
|
while (isCXXDeclarationSpecifier() == TPResult::True)
|
|
ConsumeToken();
|
|
|
|
// If we have a '>' or a ',' then this is a template argument list.
|
|
return Tok.is(tok::greater) || Tok.is(tok::comma);
|
|
}
|
|
|
|
/// 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) {
|
|
// Template argument lists are constant-evaluation contexts.
|
|
EnterExpressionEvaluationContext EvalContext(Actions,Sema::ConstantEvaluated);
|
|
ColonProtectionRAIIObject ColonProtection(*this, false);
|
|
|
|
do {
|
|
ParsedTemplateArgument Arg = ParseTemplateArgument();
|
|
SourceLocation EllipsisLoc;
|
|
if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
|
|
|
|
if (Arg.isInvalid()) {
|
|
SkipUntil(tok::comma, tok::greater, StopAtSemi | StopBeforeMatch);
|
|
return true;
|
|
}
|
|
|
|
// Save this template argument.
|
|
TemplateArgs.push_back(Arg);
|
|
|
|
// If the next token is a comma, consume it and keep reading
|
|
// arguments.
|
|
} while (TryConsumeToken(tok::comma));
|
|
|
|
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++11 feature.
|
|
Decl *Parser::ParseExplicitInstantiation(unsigned Context,
|
|
SourceLocation ExternLoc,
|
|
SourceLocation TemplateLoc,
|
|
SourceLocation &DeclEnd,
|
|
AccessSpecifier AS) {
|
|
// This isn't really required here.
|
|
ParsingDeclRAIIObject
|
|
ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
|
|
|
|
return ParseSingleDeclarationAfterTemplate(Context,
|
|
ParsedTemplateInfo(ExternLoc,
|
|
TemplateLoc),
|
|
ParsingTemplateParams,
|
|
DeclEnd, AS);
|
|
}
|
|
|
|
SourceRange Parser::ParsedTemplateInfo::getSourceRange() const {
|
|
if (TemplateParams)
|
|
return getTemplateParamsRange(TemplateParams->data(),
|
|
TemplateParams->size());
|
|
|
|
SourceRange R(TemplateLoc);
|
|
if (ExternLoc.isValid())
|
|
R.setBegin(ExternLoc);
|
|
return R;
|
|
}
|
|
|
|
void Parser::LateTemplateParserCallback(void *P, LateParsedTemplate &LPT) {
|
|
((Parser *)P)->ParseLateTemplatedFuncDef(LPT);
|
|
}
|
|
|
|
/// \brief Late parse a C++ function template in Microsoft mode.
|
|
void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
|
|
if (!LPT.D)
|
|
return;
|
|
|
|
// Get the FunctionDecl.
|
|
FunctionDecl *FunD = LPT.D->getAsFunction();
|
|
// Track template parameter depth.
|
|
TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
|
|
|
|
// To restore the context after late parsing.
|
|
Sema::ContextRAII GlobalSavedContext(Actions, Actions.CurContext);
|
|
|
|
SmallVector<ParseScope*, 4> TemplateParamScopeStack;
|
|
|
|
// Get the list of DeclContexts to reenter.
|
|
SmallVector<DeclContext*, 4> DeclContextsToReenter;
|
|
DeclContext *DD = FunD;
|
|
while (DD && !DD->isTranslationUnit()) {
|
|
DeclContextsToReenter.push_back(DD);
|
|
DD = DD->getLexicalParent();
|
|
}
|
|
|
|
// Reenter template scopes from outermost to innermost.
|
|
SmallVectorImpl<DeclContext *>::reverse_iterator II =
|
|
DeclContextsToReenter.rbegin();
|
|
for (; II != DeclContextsToReenter.rend(); ++II) {
|
|
TemplateParamScopeStack.push_back(new ParseScope(this,
|
|
Scope::TemplateParamScope));
|
|
unsigned NumParamLists =
|
|
Actions.ActOnReenterTemplateScope(getCurScope(), cast<Decl>(*II));
|
|
CurTemplateDepthTracker.addDepth(NumParamLists);
|
|
if (*II != FunD) {
|
|
TemplateParamScopeStack.push_back(new ParseScope(this, Scope::DeclScope));
|
|
Actions.PushDeclContext(Actions.getCurScope(), *II);
|
|
}
|
|
}
|
|
|
|
assert(!LPT.Toks.empty() && "Empty body!");
|
|
|
|
// Append the current token at the end of the new token stream so that it
|
|
// doesn't get lost.
|
|
LPT.Toks.push_back(Tok);
|
|
PP.EnterTokenStream(LPT.Toks.data(), LPT.Toks.size(), true, false);
|
|
|
|
// Consume the previously pushed token.
|
|
ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
|
|
assert((Tok.is(tok::l_brace) || Tok.is(tok::colon) || Tok.is(tok::kw_try))
|
|
&& "Inline method not starting with '{', ':' or 'try'");
|
|
|
|
// Parse the method body. Function body parsing code is similar enough
|
|
// to be re-used for method bodies as well.
|
|
ParseScope FnScope(this, Scope::FnScope|Scope::DeclScope);
|
|
|
|
// Recreate the containing function DeclContext.
|
|
Sema::ContextRAII FunctionSavedContext(Actions, Actions.getContainingDC(FunD));
|
|
|
|
Actions.ActOnStartOfFunctionDef(getCurScope(), FunD);
|
|
|
|
if (Tok.is(tok::kw_try)) {
|
|
ParseFunctionTryBlock(LPT.D, FnScope);
|
|
} else {
|
|
if (Tok.is(tok::colon))
|
|
ParseConstructorInitializer(LPT.D);
|
|
else
|
|
Actions.ActOnDefaultCtorInitializers(LPT.D);
|
|
|
|
if (Tok.is(tok::l_brace)) {
|
|
assert((!isa<FunctionTemplateDecl>(LPT.D) ||
|
|
cast<FunctionTemplateDecl>(LPT.D)
|
|
->getTemplateParameters()
|
|
->getDepth() == TemplateParameterDepth - 1) &&
|
|
"TemplateParameterDepth should be greater than the depth of "
|
|
"current template being instantiated!");
|
|
ParseFunctionStatementBody(LPT.D, FnScope);
|
|
Actions.UnmarkAsLateParsedTemplate(FunD);
|
|
} else
|
|
Actions.ActOnFinishFunctionBody(LPT.D, nullptr);
|
|
}
|
|
|
|
// Exit scopes.
|
|
FnScope.Exit();
|
|
SmallVectorImpl<ParseScope *>::reverse_iterator I =
|
|
TemplateParamScopeStack.rbegin();
|
|
for (; I != TemplateParamScopeStack.rend(); ++I)
|
|
delete *I;
|
|
}
|
|
|
|
/// \brief Lex a delayed template function for late parsing.
|
|
void Parser::LexTemplateFunctionForLateParsing(CachedTokens &Toks) {
|
|
tok::TokenKind kind = Tok.getKind();
|
|
if (!ConsumeAndStoreFunctionPrologue(Toks)) {
|
|
// Consume everything up to (and including) the matching right brace.
|
|
ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
|
|
}
|
|
|
|
// If we're in a function-try-block, we need to store all the catch blocks.
|
|
if (kind == tok::kw_try) {
|
|
while (Tok.is(tok::kw_catch)) {
|
|
ConsumeAndStoreUntil(tok::l_brace, Toks, /*StopAtSemi=*/false);
|
|
ConsumeAndStoreUntil(tok::r_brace, Toks, /*StopAtSemi=*/false);
|
|
}
|
|
}
|
|
}
|