1829 lines
70 KiB
C++
1829 lines
70 KiB
C++
//===--- ParseTemplate.cpp - Template Parsing -----------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements parsing of C++ templates.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclTemplate.h"
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#include "clang/AST/ExprCXX.h"
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#include "clang/Parse/ParseDiagnostic.h"
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#include "clang/Parse/Parser.h"
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#include "clang/Parse/RAIIObjectsForParser.h"
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#include "clang/Sema/DeclSpec.h"
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#include "clang/Sema/ParsedTemplate.h"
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#include "clang/Sema/Scope.h"
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#include "llvm/Support/TimeProfiler.h"
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using namespace clang;
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/// Re-enter a possible template scope, creating as many template parameter
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/// scopes as necessary.
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/// \return The number of template parameter scopes entered.
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unsigned Parser::ReenterTemplateScopes(MultiParseScope &S, Decl *D) {
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return Actions.ActOnReenterTemplateScope(D, [&] {
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S.Enter(Scope::TemplateParamScope);
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return Actions.getCurScope();
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});
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}
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/// Parse a template declaration, explicit instantiation, or
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/// explicit specialization.
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Decl *Parser::ParseDeclarationStartingWithTemplate(
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DeclaratorContext Context, SourceLocation &DeclEnd,
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ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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ObjCDeclContextSwitch ObjCDC(*this);
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if (Tok.is(tok::kw_template) && NextToken().isNot(tok::less)) {
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return ParseExplicitInstantiation(Context, SourceLocation(), ConsumeToken(),
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DeclEnd, AccessAttrs, AS);
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}
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return ParseTemplateDeclarationOrSpecialization(Context, DeclEnd, AccessAttrs,
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AS);
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}
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/// Parse a template declaration or an explicit specialization.
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///
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/// Template declarations include one or more template parameter lists
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/// and either the function or class template declaration. Explicit
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/// specializations contain one or more 'template < >' prefixes
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/// followed by a (possibly templated) declaration. Since the
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/// syntactic form of both features is nearly identical, we parse all
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/// of the template headers together and let semantic analysis sort
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/// the declarations from the explicit specializations.
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///
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/// template-declaration: [C++ temp]
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/// 'export'[opt] 'template' '<' template-parameter-list '>' declaration
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///
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/// template-declaration: [C++2a]
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/// template-head declaration
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/// template-head concept-definition
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///
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/// TODO: requires-clause
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/// template-head: [C++2a]
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/// 'template' '<' template-parameter-list '>'
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/// requires-clause[opt]
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///
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/// explicit-specialization: [ C++ temp.expl.spec]
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/// 'template' '<' '>' declaration
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Decl *Parser::ParseTemplateDeclarationOrSpecialization(
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DeclaratorContext Context, SourceLocation &DeclEnd,
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ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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assert(Tok.isOneOf(tok::kw_export, tok::kw_template) &&
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"Token does not start a template declaration.");
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MultiParseScope TemplateParamScopes(*this);
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// Tell the action that names should be checked in the context of
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// the declaration to come.
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ParsingDeclRAIIObject
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ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
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// Parse multiple levels of template headers within this template
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// parameter scope, e.g.,
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//
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// template<typename T>
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// template<typename U>
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// class A<T>::B { ... };
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//
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// We parse multiple levels non-recursively so that we can build a
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// single data structure containing all of the template parameter
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// lists to easily differentiate between the case above and:
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//
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// template<typename T>
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// class A {
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// template<typename U> class B;
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// };
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//
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// In the first case, the action for declaring A<T>::B receives
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// both template parameter lists. In the second case, the action for
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// defining A<T>::B receives just the inner template parameter list
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// (and retrieves the outer template parameter list from its
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// context).
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bool isSpecialization = true;
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bool LastParamListWasEmpty = false;
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TemplateParameterLists ParamLists;
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TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
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do {
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// Consume the 'export', if any.
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SourceLocation ExportLoc;
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TryConsumeToken(tok::kw_export, ExportLoc);
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// Consume the 'template', which should be here.
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SourceLocation TemplateLoc;
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if (!TryConsumeToken(tok::kw_template, TemplateLoc)) {
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Diag(Tok.getLocation(), diag::err_expected_template);
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return nullptr;
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}
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// Parse the '<' template-parameter-list '>'
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SourceLocation LAngleLoc, RAngleLoc;
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SmallVector<NamedDecl*, 4> TemplateParams;
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if (ParseTemplateParameters(TemplateParamScopes,
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CurTemplateDepthTracker.getDepth(),
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TemplateParams, LAngleLoc, RAngleLoc)) {
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// Skip until the semi-colon or a '}'.
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SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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TryConsumeToken(tok::semi);
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return nullptr;
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}
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ExprResult OptionalRequiresClauseConstraintER;
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if (!TemplateParams.empty()) {
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isSpecialization = false;
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++CurTemplateDepthTracker;
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if (TryConsumeToken(tok::kw_requires)) {
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OptionalRequiresClauseConstraintER =
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Actions.ActOnRequiresClause(ParseConstraintLogicalOrExpression(
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/*IsTrailingRequiresClause=*/false));
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if (!OptionalRequiresClauseConstraintER.isUsable()) {
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// Skip until the semi-colon or a '}'.
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SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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TryConsumeToken(tok::semi);
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return nullptr;
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}
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}
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} else {
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LastParamListWasEmpty = true;
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}
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ParamLists.push_back(Actions.ActOnTemplateParameterList(
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CurTemplateDepthTracker.getDepth(), ExportLoc, TemplateLoc, LAngleLoc,
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TemplateParams, RAngleLoc, OptionalRequiresClauseConstraintER.get()));
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} while (Tok.isOneOf(tok::kw_export, tok::kw_template));
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// Parse the actual template declaration.
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if (Tok.is(tok::kw_concept))
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return ParseConceptDefinition(
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ParsedTemplateInfo(&ParamLists, isSpecialization,
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LastParamListWasEmpty),
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DeclEnd);
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return ParseSingleDeclarationAfterTemplate(
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Context,
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ParsedTemplateInfo(&ParamLists, isSpecialization, LastParamListWasEmpty),
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ParsingTemplateParams, DeclEnd, AccessAttrs, AS);
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}
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/// Parse a single declaration that declares a template,
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/// template specialization, or explicit instantiation of a template.
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///
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/// \param DeclEnd will receive the source location of the last token
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/// within this declaration.
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///
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/// \param AS the access specifier associated with this
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/// declaration. Will be AS_none for namespace-scope declarations.
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///
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/// \returns the new declaration.
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Decl *Parser::ParseSingleDeclarationAfterTemplate(
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DeclaratorContext Context, const ParsedTemplateInfo &TemplateInfo,
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ParsingDeclRAIIObject &DiagsFromTParams, SourceLocation &DeclEnd,
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ParsedAttributes &AccessAttrs, AccessSpecifier AS) {
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assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
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"Template information required");
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if (Tok.is(tok::kw_static_assert)) {
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// A static_assert declaration may not be templated.
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Diag(Tok.getLocation(), diag::err_templated_invalid_declaration)
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<< TemplateInfo.getSourceRange();
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// Parse the static_assert declaration to improve error recovery.
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return ParseStaticAssertDeclaration(DeclEnd);
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}
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if (Context == DeclaratorContext::Member) {
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// We are parsing a member template.
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ParseCXXClassMemberDeclaration(AS, AccessAttrs, TemplateInfo,
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&DiagsFromTParams);
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return nullptr;
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}
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ParsedAttributesWithRange prefixAttrs(AttrFactory);
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MaybeParseCXX11Attributes(prefixAttrs);
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if (Tok.is(tok::kw_using)) {
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auto usingDeclPtr = ParseUsingDirectiveOrDeclaration(Context, TemplateInfo, DeclEnd,
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prefixAttrs);
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if (!usingDeclPtr || !usingDeclPtr.get().isSingleDecl())
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return nullptr;
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return usingDeclPtr.get().getSingleDecl();
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}
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// Parse the declaration specifiers, stealing any diagnostics from
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// the template parameters.
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ParsingDeclSpec DS(*this, &DiagsFromTParams);
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ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
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getDeclSpecContextFromDeclaratorContext(Context));
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if (Tok.is(tok::semi)) {
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ProhibitAttributes(prefixAttrs);
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DeclEnd = ConsumeToken();
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RecordDecl *AnonRecord = nullptr;
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Decl *Decl = Actions.ParsedFreeStandingDeclSpec(
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getCurScope(), AS, DS,
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TemplateInfo.TemplateParams ? *TemplateInfo.TemplateParams
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: MultiTemplateParamsArg(),
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TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation,
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AnonRecord);
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assert(!AnonRecord &&
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"Anonymous unions/structs should not be valid with template");
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DS.complete(Decl);
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return Decl;
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}
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// Move the attributes from the prefix into the DS.
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if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
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ProhibitAttributes(prefixAttrs);
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else
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DS.takeAttributesFrom(prefixAttrs);
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// Parse the declarator.
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ParsingDeclarator DeclaratorInfo(*this, DS, (DeclaratorContext)Context);
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if (TemplateInfo.TemplateParams)
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DeclaratorInfo.setTemplateParameterLists(*TemplateInfo.TemplateParams);
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ParseDeclarator(DeclaratorInfo);
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// Error parsing the declarator?
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if (!DeclaratorInfo.hasName()) {
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// If so, skip until the semi-colon or a }.
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SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
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if (Tok.is(tok::semi))
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ConsumeToken();
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return nullptr;
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}
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llvm::TimeTraceScope TimeScope("ParseTemplate", [&]() {
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return std::string(DeclaratorInfo.getIdentifier() != nullptr
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? DeclaratorInfo.getIdentifier()->getName()
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: "<unknown>");
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});
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LateParsedAttrList LateParsedAttrs(true);
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if (DeclaratorInfo.isFunctionDeclarator()) {
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if (Tok.is(tok::kw_requires))
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ParseTrailingRequiresClause(DeclaratorInfo);
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MaybeParseGNUAttributes(DeclaratorInfo, &LateParsedAttrs);
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}
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if (DeclaratorInfo.isFunctionDeclarator() &&
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isStartOfFunctionDefinition(DeclaratorInfo)) {
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// Function definitions are only allowed at file scope and in C++ classes.
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// The C++ inline method definition case is handled elsewhere, so we only
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// need to handle the file scope definition case.
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if (Context != DeclaratorContext::File) {
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Diag(Tok, diag::err_function_definition_not_allowed);
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SkipMalformedDecl();
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return nullptr;
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}
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if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
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// Recover by ignoring the 'typedef'. This was probably supposed to be
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// the 'typename' keyword, which we should have already suggested adding
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// if it's appropriate.
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Diag(DS.getStorageClassSpecLoc(), diag::err_function_declared_typedef)
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<< FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
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DS.ClearStorageClassSpecs();
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}
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if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
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if (DeclaratorInfo.getName().getKind() !=
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UnqualifiedIdKind::IK_TemplateId) {
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// If the declarator-id is not a template-id, issue a diagnostic and
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// recover by ignoring the 'template' keyword.
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Diag(Tok, diag::err_template_defn_explicit_instantiation) << 0;
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return ParseFunctionDefinition(DeclaratorInfo, ParsedTemplateInfo(),
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&LateParsedAttrs);
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} else {
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SourceLocation LAngleLoc
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= PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
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Diag(DeclaratorInfo.getIdentifierLoc(),
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diag::err_explicit_instantiation_with_definition)
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<< SourceRange(TemplateInfo.TemplateLoc)
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<< FixItHint::CreateInsertion(LAngleLoc, "<>");
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// Recover as if it were an explicit specialization.
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TemplateParameterLists FakedParamLists;
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FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
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0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
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LAngleLoc, nullptr));
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return ParseFunctionDefinition(
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DeclaratorInfo, ParsedTemplateInfo(&FakedParamLists,
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/*isSpecialization=*/true,
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/*lastParameterListWasEmpty=*/true),
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&LateParsedAttrs);
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}
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}
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return ParseFunctionDefinition(DeclaratorInfo, TemplateInfo,
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&LateParsedAttrs);
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}
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// Parse this declaration.
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Decl *ThisDecl = ParseDeclarationAfterDeclarator(DeclaratorInfo,
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TemplateInfo);
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if (Tok.is(tok::comma)) {
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Diag(Tok, diag::err_multiple_template_declarators)
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<< (int)TemplateInfo.Kind;
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SkipUntil(tok::semi);
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return ThisDecl;
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}
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// Eat the semi colon after the declaration.
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ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
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if (LateParsedAttrs.size() > 0)
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ParseLexedAttributeList(LateParsedAttrs, ThisDecl, true, false);
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DeclaratorInfo.complete(ThisDecl);
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return ThisDecl;
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}
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/// \brief Parse a single declaration that declares a concept.
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///
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/// \param DeclEnd will receive the source location of the last token
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/// within this declaration.
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///
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/// \returns the new declaration.
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Decl *
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Parser::ParseConceptDefinition(const ParsedTemplateInfo &TemplateInfo,
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SourceLocation &DeclEnd) {
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assert(TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
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"Template information required");
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assert(Tok.is(tok::kw_concept) &&
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"ParseConceptDefinition must be called when at a 'concept' keyword");
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ConsumeToken(); // Consume 'concept'
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SourceLocation BoolKWLoc;
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if (TryConsumeToken(tok::kw_bool, BoolKWLoc))
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Diag(Tok.getLocation(), diag::ext_concept_legacy_bool_keyword) <<
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FixItHint::CreateRemoval(SourceLocation(BoolKWLoc));
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DiagnoseAndSkipCXX11Attributes();
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CXXScopeSpec SS;
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if (ParseOptionalCXXScopeSpecifier(
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SS, /*ObjectType=*/nullptr,
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/*ObjectHadErrors=*/false, /*EnteringContext=*/false,
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/*MayBePseudoDestructor=*/nullptr,
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/*IsTypename=*/false, /*LastII=*/nullptr, /*OnlyNamespace=*/true) ||
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SS.isInvalid()) {
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SkipUntil(tok::semi);
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return nullptr;
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}
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if (SS.isNotEmpty())
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Diag(SS.getBeginLoc(),
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diag::err_concept_definition_not_identifier);
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UnqualifiedId Result;
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if (ParseUnqualifiedId(SS, /*ObjectType=*/nullptr,
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/*ObjectHadErrors=*/false, /*EnteringContext=*/false,
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/*AllowDestructorName=*/false,
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/*AllowConstructorName=*/false,
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/*AllowDeductionGuide=*/false,
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/*TemplateKWLoc=*/nullptr, Result)) {
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SkipUntil(tok::semi);
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return nullptr;
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}
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if (Result.getKind() != UnqualifiedIdKind::IK_Identifier) {
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Diag(Result.getBeginLoc(), diag::err_concept_definition_not_identifier);
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SkipUntil(tok::semi);
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return nullptr;
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}
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IdentifierInfo *Id = Result.Identifier;
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SourceLocation IdLoc = Result.getBeginLoc();
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DiagnoseAndSkipCXX11Attributes();
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if (!TryConsumeToken(tok::equal)) {
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Diag(Tok.getLocation(), diag::err_expected) << tok::equal;
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SkipUntil(tok::semi);
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return nullptr;
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}
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ExprResult ConstraintExprResult =
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Actions.CorrectDelayedTyposInExpr(ParseConstraintExpression());
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if (ConstraintExprResult.isInvalid()) {
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SkipUntil(tok::semi);
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return nullptr;
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}
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DeclEnd = Tok.getLocation();
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ExpectAndConsumeSemi(diag::err_expected_semi_declaration);
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Expr *ConstraintExpr = ConstraintExprResult.get();
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return Actions.ActOnConceptDefinition(getCurScope(),
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*TemplateInfo.TemplateParams,
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Id, IdLoc, ConstraintExpr);
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}
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/// ParseTemplateParameters - Parses a template-parameter-list enclosed in
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/// angle brackets. Depth is the depth of this template-parameter-list, which
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/// is the number of template headers directly enclosing this template header.
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/// TemplateParams is the current list of template parameters we're building.
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/// The template parameter we parse will be added to this list. LAngleLoc and
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/// RAngleLoc will receive the positions of the '<' and '>', respectively,
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/// that enclose this template parameter list.
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///
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/// \returns true if an error occurred, false otherwise.
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bool Parser::ParseTemplateParameters(
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MultiParseScope &TemplateScopes, unsigned Depth,
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SmallVectorImpl<NamedDecl *> &TemplateParams, SourceLocation &LAngleLoc,
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SourceLocation &RAngleLoc) {
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// Get the template parameter list.
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if (!TryConsumeToken(tok::less, LAngleLoc)) {
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Diag(Tok.getLocation(), diag::err_expected_less_after) << "template";
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return true;
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}
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// Try to parse the template parameter list.
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bool Failed = false;
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// FIXME: Missing greatergreatergreater support.
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if (!Tok.is(tok::greater) && !Tok.is(tok::greatergreater)) {
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TemplateScopes.Enter(Scope::TemplateParamScope);
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Failed = ParseTemplateParameterList(Depth, TemplateParams);
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}
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if (Tok.is(tok::greatergreater)) {
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// No diagnostic required here: a template-parameter-list can only be
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// followed by a declaration or, for a template template parameter, the
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// 'class' keyword. Therefore, the second '>' will be diagnosed later.
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// This matters for elegant diagnosis of:
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// template<template<typename>> struct S;
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Tok.setKind(tok::greater);
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RAngleLoc = Tok.getLocation();
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Tok.setLocation(Tok.getLocation().getLocWithOffset(1));
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} else if (!TryConsumeToken(tok::greater, RAngleLoc) && Failed) {
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Diag(Tok.getLocation(), diag::err_expected) << tok::greater;
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return true;
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}
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return false;
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}
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/// ParseTemplateParameterList - Parse a template parameter list. If
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/// the parsing fails badly (i.e., closing bracket was left out), this
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/// will try to put the token stream in a reasonable position (closing
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/// a statement, etc.) and return false.
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///
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/// template-parameter-list: [C++ temp]
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/// template-parameter
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/// template-parameter-list ',' template-parameter
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bool
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Parser::ParseTemplateParameterList(const unsigned Depth,
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SmallVectorImpl<NamedDecl*> &TemplateParams) {
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while (1) {
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if (NamedDecl *TmpParam
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= ParseTemplateParameter(Depth, TemplateParams.size())) {
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TemplateParams.push_back(TmpParam);
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} else {
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// If we failed to parse a template parameter, skip until we find
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// a comma or closing brace.
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SkipUntil(tok::comma, tok::greater, tok::greatergreater,
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StopAtSemi | StopBeforeMatch);
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}
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|
|
// Did we find a comma or the end of the template parameter list?
|
|
if (Tok.is(tok::comma)) {
|
|
ConsumeToken();
|
|
} else if (Tok.isOneOf(tok::greater, 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;
|
|
}
|
|
|
|
/// Determine whether the parser is at the start of a template
|
|
/// type parameter.
|
|
Parser::TPResult 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 TPResult::True;
|
|
|
|
case tok::identifier:
|
|
// This may be either a type-parameter or an elaborated-type-specifier.
|
|
// We have to look further.
|
|
break;
|
|
|
|
default:
|
|
return TPResult::False;
|
|
}
|
|
|
|
switch (GetLookAheadToken(2).getKind()) {
|
|
case tok::equal:
|
|
case tok::comma:
|
|
case tok::greater:
|
|
case tok::greatergreater:
|
|
return TPResult::True;
|
|
|
|
default:
|
|
return TPResult::False;
|
|
}
|
|
}
|
|
|
|
if (TryAnnotateTypeConstraint())
|
|
return TPResult::Error;
|
|
|
|
if (isTypeConstraintAnnotation() &&
|
|
// Next token might be 'auto' or 'decltype', indicating that this
|
|
// type-constraint is in fact part of a placeholder-type-specifier of a
|
|
// non-type template parameter.
|
|
!GetLookAheadToken(Tok.is(tok::annot_cxxscope) ? 2 : 1)
|
|
.isOneOf(tok::kw_auto, tok::kw_decltype))
|
|
return TPResult::True;
|
|
|
|
// 'typedef' is a reasonably-common typo/thinko for 'typename', and is
|
|
// ill-formed otherwise.
|
|
if (Tok.isNot(tok::kw_typename) && Tok.isNot(tok::kw_typedef))
|
|
return TPResult::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 TPResult::True;
|
|
|
|
case tok::kw_typename:
|
|
case tok::kw_typedef:
|
|
case tok::kw_class:
|
|
// These indicate that a comma was missed after a type parameter, not that
|
|
// we have found a non-type parameter.
|
|
return TPResult::True;
|
|
|
|
default:
|
|
return TPResult::False;
|
|
}
|
|
}
|
|
|
|
/// ParseTemplateParameter - Parse a template-parameter (C++ [temp.param]).
|
|
///
|
|
/// template-parameter: [C++ temp.param]
|
|
/// type-parameter
|
|
/// parameter-declaration
|
|
///
|
|
/// type-parameter: (See below)
|
|
/// type-parameter-key ...[opt] identifier[opt]
|
|
/// type-parameter-key identifier[opt] = type-id
|
|
/// (C++2a) type-constraint ...[opt] identifier[opt]
|
|
/// (C++2a) type-constraint identifier[opt] = type-id
|
|
/// '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
|
|
///
|
|
NamedDecl *Parser::ParseTemplateParameter(unsigned Depth, unsigned Position) {
|
|
|
|
switch (isStartOfTemplateTypeParameter()) {
|
|
case TPResult::True:
|
|
// Is there just a typo in the input code? ('typedef' instead of
|
|
// 'typename')
|
|
if (Tok.is(tok::kw_typedef)) {
|
|
Diag(Tok.getLocation(), diag::err_expected_template_parameter);
|
|
|
|
Diag(Tok.getLocation(), diag::note_meant_to_use_typename)
|
|
<< FixItHint::CreateReplacement(CharSourceRange::getCharRange(
|
|
Tok.getLocation(),
|
|
Tok.getEndLoc()),
|
|
"typename");
|
|
|
|
Tok.setKind(tok::kw_typename);
|
|
}
|
|
|
|
return ParseTypeParameter(Depth, Position);
|
|
case TPResult::False:
|
|
break;
|
|
|
|
case TPResult::Error: {
|
|
// We return an invalid parameter as opposed to null to avoid having bogus
|
|
// diagnostics about an empty template parameter list.
|
|
// FIXME: Fix ParseTemplateParameterList to better handle nullptr results
|
|
// from here.
|
|
// Return a NTTP as if there was an error in a scope specifier, the user
|
|
// probably meant to write the type of a NTTP.
|
|
DeclSpec DS(getAttrFactory());
|
|
DS.SetTypeSpecError();
|
|
Declarator D(DS, DeclaratorContext::TemplateParam);
|
|
D.SetIdentifier(nullptr, Tok.getLocation());
|
|
D.setInvalidType(true);
|
|
NamedDecl *ErrorParam = Actions.ActOnNonTypeTemplateParameter(
|
|
getCurScope(), D, Depth, Position, /*EqualLoc=*/SourceLocation(),
|
|
/*DefaultArg=*/nullptr);
|
|
ErrorParam->setInvalidDecl(true);
|
|
SkipUntil(tok::comma, tok::greater, tok::greatergreater,
|
|
StopAtSemi | StopBeforeMatch);
|
|
return ErrorParam;
|
|
}
|
|
|
|
case TPResult::Ambiguous:
|
|
llvm_unreachable("template param classification can't be ambiguous");
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/// Check whether the current token is a template-id annotation denoting a
|
|
/// type-constraint.
|
|
bool Parser::isTypeConstraintAnnotation() {
|
|
const Token &T = Tok.is(tok::annot_cxxscope) ? NextToken() : Tok;
|
|
if (T.isNot(tok::annot_template_id))
|
|
return false;
|
|
const auto *ExistingAnnot =
|
|
static_cast<TemplateIdAnnotation *>(T.getAnnotationValue());
|
|
return ExistingAnnot->Kind == TNK_Concept_template;
|
|
}
|
|
|
|
/// Try parsing a type-constraint at the current location.
|
|
///
|
|
/// type-constraint:
|
|
/// nested-name-specifier[opt] concept-name
|
|
/// nested-name-specifier[opt] concept-name
|
|
/// '<' template-argument-list[opt] '>'[opt]
|
|
///
|
|
/// \returns true if an error occurred, and false otherwise.
|
|
bool Parser::TryAnnotateTypeConstraint() {
|
|
if (!getLangOpts().CPlusPlus20)
|
|
return false;
|
|
CXXScopeSpec SS;
|
|
bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
|
|
if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
|
|
/*ObjectHadErrors=*/false,
|
|
/*EnteringContext=*/false,
|
|
/*MayBePseudoDestructor=*/nullptr,
|
|
// If this is not a type-constraint, then
|
|
// this scope-spec is part of the typename
|
|
// of a non-type template parameter
|
|
/*IsTypename=*/true, /*LastII=*/nullptr,
|
|
// We won't find concepts in
|
|
// non-namespaces anyway, so might as well
|
|
// parse this correctly for possible type
|
|
// names.
|
|
/*OnlyNamespace=*/false))
|
|
return true;
|
|
|
|
if (Tok.is(tok::identifier)) {
|
|
UnqualifiedId PossibleConceptName;
|
|
PossibleConceptName.setIdentifier(Tok.getIdentifierInfo(),
|
|
Tok.getLocation());
|
|
|
|
TemplateTy PossibleConcept;
|
|
bool MemberOfUnknownSpecialization = false;
|
|
auto TNK = Actions.isTemplateName(getCurScope(), SS,
|
|
/*hasTemplateKeyword=*/false,
|
|
PossibleConceptName,
|
|
/*ObjectType=*/ParsedType(),
|
|
/*EnteringContext=*/false,
|
|
PossibleConcept,
|
|
MemberOfUnknownSpecialization,
|
|
/*Disambiguation=*/true);
|
|
if (MemberOfUnknownSpecialization || !PossibleConcept ||
|
|
TNK != TNK_Concept_template) {
|
|
if (SS.isNotEmpty())
|
|
AnnotateScopeToken(SS, !WasScopeAnnotation);
|
|
return false;
|
|
}
|
|
|
|
// At this point we're sure we're dealing with a constrained parameter. It
|
|
// may or may not have a template parameter list following the concept
|
|
// name.
|
|
if (AnnotateTemplateIdToken(PossibleConcept, TNK, SS,
|
|
/*TemplateKWLoc=*/SourceLocation(),
|
|
PossibleConceptName,
|
|
/*AllowTypeAnnotation=*/false,
|
|
/*TypeConstraint=*/true))
|
|
return true;
|
|
}
|
|
|
|
if (SS.isNotEmpty())
|
|
AnnotateScopeToken(SS, !WasScopeAnnotation);
|
|
return false;
|
|
}
|
|
|
|
/// 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
|
|
NamedDecl *Parser::ParseTypeParameter(unsigned Depth, unsigned Position) {
|
|
assert((Tok.isOneOf(tok::kw_class, tok::kw_typename) ||
|
|
isTypeConstraintAnnotation()) &&
|
|
"A type-parameter starts with 'class', 'typename' or a "
|
|
"type-constraint");
|
|
|
|
CXXScopeSpec TypeConstraintSS;
|
|
TemplateIdAnnotation *TypeConstraint = nullptr;
|
|
bool TypenameKeyword = false;
|
|
SourceLocation KeyLoc;
|
|
ParseOptionalCXXScopeSpecifier(TypeConstraintSS, /*ObjectType=*/nullptr,
|
|
/*ObjectHadErrors=*/false,
|
|
/*EnteringContext*/ false);
|
|
if (Tok.is(tok::annot_template_id)) {
|
|
// Consume the 'type-constraint'.
|
|
TypeConstraint =
|
|
static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
|
|
assert(TypeConstraint->Kind == TNK_Concept_template &&
|
|
"stray non-concept template-id annotation");
|
|
KeyLoc = ConsumeAnnotationToken();
|
|
} else {
|
|
assert(TypeConstraintSS.isEmpty() &&
|
|
"expected type constraint after scope specifier");
|
|
|
|
// Consume the 'class' or 'typename' keyword.
|
|
TypenameKeyword = Tok.is(tok::kw_typename);
|
|
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 = Tok.getLocation();
|
|
IdentifierInfo *ParamName = nullptr;
|
|
if (Tok.is(tok::identifier)) {
|
|
ParamName = Tok.getIdentifierInfo();
|
|
ConsumeToken();
|
|
} else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
|
|
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, DeclaratorContext::TemplateTypeArg)
|
|
.get();
|
|
|
|
NamedDecl *NewDecl = Actions.ActOnTypeParameter(getCurScope(),
|
|
TypenameKeyword, EllipsisLoc,
|
|
KeyLoc, ParamName, NameLoc,
|
|
Depth, Position, EqualLoc,
|
|
DefaultArg,
|
|
TypeConstraint != nullptr);
|
|
|
|
if (TypeConstraint) {
|
|
Actions.ActOnTypeConstraint(TypeConstraintSS, TypeConstraint,
|
|
cast<TemplateTypeParmDecl>(NewDecl),
|
|
EllipsisLoc);
|
|
}
|
|
|
|
return NewDecl;
|
|
}
|
|
|
|
/// 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]
|
|
NamedDecl *
|
|
Parser::ParseTemplateTemplateParameter(unsigned Depth, unsigned Position) {
|
|
assert(Tok.is(tok::kw_template) && "Expected 'template' keyword");
|
|
|
|
// Handle the template <...> part.
|
|
SourceLocation TemplateLoc = ConsumeToken();
|
|
SmallVector<NamedDecl*,8> TemplateParams;
|
|
SourceLocation LAngleLoc, RAngleLoc;
|
|
{
|
|
MultiParseScope TemplateParmScope(*this);
|
|
if (ParseTemplateParameters(TemplateParmScope, 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.isOneOf(tok::kw_typename, tok::kw_struct);
|
|
const Token &Next = Tok.is(tok::kw_struct) ? NextToken() : Tok;
|
|
if (Tok.is(tok::kw_typename)) {
|
|
Diag(Tok.getLocation(),
|
|
getLangOpts().CPlusPlus17
|
|
? diag::warn_cxx14_compat_template_template_param_typename
|
|
: diag::ext_template_template_param_typename)
|
|
<< (!getLangOpts().CPlusPlus17
|
|
? FixItHint::CreateReplacement(Tok.getLocation(), "class")
|
|
: FixItHint());
|
|
} else if (Next.isOneOf(tok::identifier, tok::comma, tok::greater,
|
|
tok::greatergreater, 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 = Tok.getLocation();
|
|
IdentifierInfo *ParamName = nullptr;
|
|
if (Tok.is(tok::identifier)) {
|
|
ParamName = Tok.getIdentifierInfo();
|
|
ConsumeToken();
|
|
} else if (Tok.isOneOf(tok::equal, tok::comma, tok::greater,
|
|
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,
|
|
RAngleLoc, nullptr);
|
|
|
|
// 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
|
|
NamedDecl *
|
|
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, ParsedTemplateInfo(), AS_none,
|
|
DeclSpecContext::DSC_template_param);
|
|
|
|
// Parse this as a typename.
|
|
Declarator ParamDecl(DS, DeclaratorContext::TemplateParam);
|
|
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 ConstantEvaluated(
|
|
Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
|
|
|
|
DefaultArg = Actions.CorrectDelayedTyposInExpr(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());
|
|
}
|
|
|
|
/// 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 consumed.
|
|
///
|
|
/// \param ObjCGenericList if true, this is the '>' closing an Objective-C
|
|
/// type parameter or type argument list, rather than a C++ template parameter
|
|
/// or argument list.
|
|
///
|
|
/// \returns true, if current token does not start with '>', false otherwise.
|
|
bool Parser::ParseGreaterThanInTemplateList(SourceLocation LAngleLoc,
|
|
SourceLocation &RAngleLoc,
|
|
bool ConsumeLastToken,
|
|
bool ObjCGenericList) {
|
|
// What will be left once we've consumed the '>'.
|
|
tok::TokenKind RemainingToken;
|
|
const char *ReplacementStr = "> >";
|
|
bool MergeWithNextToken = false;
|
|
|
|
switch (Tok.getKind()) {
|
|
default:
|
|
Diag(getEndOfPreviousToken(), diag::err_expected) << tok::greater;
|
|
Diag(LAngleLoc, diag::note_matching) << tok::less;
|
|
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 = "> =";
|
|
|
|
// Join two adjacent '=' tokens into one, for cases like:
|
|
// void (*p)() = f<int>;
|
|
// return f<int>==p;
|
|
if (NextToken().is(tok::equal) &&
|
|
areTokensAdjacent(Tok, NextToken())) {
|
|
RemainingToken = tok::equalequal;
|
|
MergeWithNextToken = true;
|
|
}
|
|
break;
|
|
|
|
case tok::greatergreaterequal:
|
|
RemainingToken = tok::greaterequal;
|
|
break;
|
|
}
|
|
|
|
// This template-id is terminated by a token that starts with a '>'.
|
|
// Outside C++11 and Objective-C, this is now error recovery.
|
|
//
|
|
// C++11 allows this when the token is '>>', and in CUDA + C++11 mode, we
|
|
// extend that treatment to also apply to the '>>>' token.
|
|
//
|
|
// Objective-C allows this in its type parameter / argument lists.
|
|
|
|
SourceLocation TokBeforeGreaterLoc = PrevTokLocation;
|
|
SourceLocation TokLoc = Tok.getLocation();
|
|
Token Next = NextToken();
|
|
|
|
// Whether splitting the current token after the '>' would undesirably result
|
|
// in the remaining token pasting with the token after it. This excludes the
|
|
// MergeWithNextToken cases, which we've already handled.
|
|
bool PreventMergeWithNextToken =
|
|
(RemainingToken == tok::greater ||
|
|
RemainingToken == tok::greatergreater) &&
|
|
(Next.isOneOf(tok::greater, tok::greatergreater,
|
|
tok::greatergreatergreater, tok::equal, tok::greaterequal,
|
|
tok::greatergreaterequal, tok::equalequal)) &&
|
|
areTokensAdjacent(Tok, Next);
|
|
|
|
// Diagnose this situation as appropriate.
|
|
if (!ObjCGenericList) {
|
|
// The source range of the replaced token(s).
|
|
CharSourceRange ReplacementRange = CharSourceRange::getCharRange(
|
|
TokLoc, Lexer::AdvanceToTokenCharacter(TokLoc, 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;
|
|
if (PreventMergeWithNextToken)
|
|
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(TokLoc, DiagId) << Hint1 << Hint2;
|
|
}
|
|
|
|
// Find the "length" of the resulting '>' token. This is not always 1, as it
|
|
// can contain escaped newlines.
|
|
unsigned GreaterLength = Lexer::getTokenPrefixLength(
|
|
TokLoc, 1, PP.getSourceManager(), getLangOpts());
|
|
|
|
// Annotate the source buffer to indicate that we split the token after the
|
|
// '>'. This allows us to properly find the end of, and extract the spelling
|
|
// of, the '>' token later.
|
|
RAngleLoc = PP.SplitToken(TokLoc, GreaterLength);
|
|
|
|
// Strip the initial '>' from the token.
|
|
bool CachingTokens = PP.IsPreviousCachedToken(Tok);
|
|
|
|
Token Greater = Tok;
|
|
Greater.setLocation(RAngleLoc);
|
|
Greater.setKind(tok::greater);
|
|
Greater.setLength(GreaterLength);
|
|
|
|
unsigned OldLength = Tok.getLength();
|
|
if (MergeWithNextToken) {
|
|
ConsumeToken();
|
|
OldLength += Tok.getLength();
|
|
}
|
|
|
|
Tok.setKind(RemainingToken);
|
|
Tok.setLength(OldLength - GreaterLength);
|
|
|
|
// Split the second token if lexing it normally would lex a different token
|
|
// (eg, the fifth token in 'A<B>>>' should re-lex as '>', not '>>').
|
|
SourceLocation AfterGreaterLoc = TokLoc.getLocWithOffset(GreaterLength);
|
|
if (PreventMergeWithNextToken)
|
|
AfterGreaterLoc = PP.SplitToken(AfterGreaterLoc, Tok.getLength());
|
|
Tok.setLocation(AfterGreaterLoc);
|
|
|
|
// Update the token cache to match what we just did if necessary.
|
|
if (CachingTokens) {
|
|
// If the previous cached token is being merged, delete it.
|
|
if (MergeWithNextToken)
|
|
PP.ReplacePreviousCachedToken({});
|
|
|
|
if (ConsumeLastToken)
|
|
PP.ReplacePreviousCachedToken({Greater, Tok});
|
|
else
|
|
PP.ReplacePreviousCachedToken({Greater});
|
|
}
|
|
|
|
if (ConsumeLastToken) {
|
|
PrevTokLocation = RAngleLoc;
|
|
} else {
|
|
PrevTokLocation = TokBeforeGreaterLoc;
|
|
PP.EnterToken(Tok, /*IsReinject=*/true);
|
|
Tok = Greater;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
/// 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 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(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.isOneOf(tok::greater, tok::greatergreater,
|
|
tok::greatergreatergreater, tok::greaterequal,
|
|
tok::greatergreaterequal))
|
|
Invalid = ParseTemplateArgumentList(TemplateArgs);
|
|
|
|
if (Invalid) {
|
|
// Try to find the closing '>'.
|
|
if (getLangOpts().CPlusPlus11)
|
|
SkipUntil(tok::greater, tok::greatergreater,
|
|
tok::greatergreatergreater, StopAtSemi | StopBeforeMatch);
|
|
else
|
|
SkipUntil(tok::greater, StopAtSemi | StopBeforeMatch);
|
|
}
|
|
}
|
|
|
|
return ParseGreaterThanInTemplateList(LAngleLoc, RAngleLoc, ConsumeLastToken,
|
|
/*ObjCGenericList=*/false) ||
|
|
Invalid;
|
|
}
|
|
|
|
/// 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.
|
|
///
|
|
/// \param TypeConstraint if true, then this is actually a type-constraint,
|
|
/// meaning that the template argument list can be omitted (and the template in
|
|
/// question must be a concept).
|
|
///
|
|
/// 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,
|
|
bool TypeConstraint) {
|
|
assert(getLangOpts().CPlusPlus && "Can only annotate template-ids in C++");
|
|
assert((Tok.is(tok::less) || TypeConstraint) &&
|
|
"Parser isn't at the beginning of a template-id");
|
|
assert(!(TypeConstraint && AllowTypeAnnotation) && "type-constraint can't be "
|
|
"a type annotation");
|
|
assert((!TypeConstraint || TNK == TNK_Concept_template) && "type-constraint "
|
|
"must accompany a concept name");
|
|
assert((Template || TNK == TNK_Non_template) && "missing template name");
|
|
|
|
// Consume the template-name.
|
|
SourceLocation TemplateNameLoc = TemplateName.getSourceRange().getBegin();
|
|
|
|
// Parse the enclosed template argument list.
|
|
SourceLocation LAngleLoc, RAngleLoc;
|
|
TemplateArgList TemplateArgs;
|
|
bool ArgsInvalid = false;
|
|
if (!TypeConstraint || Tok.is(tok::less)) {
|
|
ArgsInvalid = ParseTemplateIdAfterTemplateName(false, LAngleLoc,
|
|
TemplateArgs, RAngleLoc);
|
|
// If we couldn't recover from invalid arguments, don't form an annotation
|
|
// token -- we don't know how much to annotate.
|
|
// FIXME: This can lead to duplicate diagnostics if we retry parsing this
|
|
// template-id in another context. Try to annotate anyway?
|
|
if (RAngleLoc.isInvalid())
|
|
return true;
|
|
}
|
|
|
|
ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
|
|
|
|
// Build the annotation token.
|
|
if (TNK == TNK_Type_template && AllowTypeAnnotation) {
|
|
TypeResult Type = ArgsInvalid
|
|
? TypeError()
|
|
: Actions.ActOnTemplateIdType(
|
|
getCurScope(), SS, TemplateKWLoc, Template,
|
|
TemplateName.Identifier, TemplateNameLoc,
|
|
LAngleLoc, TemplateArgsPtr, RAngleLoc);
|
|
|
|
Tok.setKind(tok::annot_typename);
|
|
setTypeAnnotation(Tok, Type);
|
|
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);
|
|
|
|
IdentifierInfo *TemplateII =
|
|
TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
|
|
? TemplateName.Identifier
|
|
: nullptr;
|
|
|
|
OverloadedOperatorKind OpKind =
|
|
TemplateName.getKind() == UnqualifiedIdKind::IK_Identifier
|
|
? OO_None
|
|
: TemplateName.OperatorFunctionId.Operator;
|
|
|
|
TemplateIdAnnotation *TemplateId = TemplateIdAnnotation::Create(
|
|
TemplateKWLoc, TemplateNameLoc, TemplateII, OpKind, Template, TNK,
|
|
LAngleLoc, RAngleLoc, TemplateArgs, ArgsInvalid, TemplateIds);
|
|
|
|
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;
|
|
}
|
|
|
|
/// 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.
|
|
///
|
|
/// \param SS The scope specifier appearing before the template-id, if any.
|
|
///
|
|
/// \param IsClassName Is this template-id appearing in a context where we
|
|
/// know it names a class, such as in an elaborated-type-specifier or
|
|
/// base-specifier? ('typename' and 'template' are unneeded and disallowed
|
|
/// in those contexts.)
|
|
void Parser::AnnotateTemplateIdTokenAsType(CXXScopeSpec &SS,
|
|
bool IsClassName) {
|
|
assert(Tok.is(tok::annot_template_id) && "Requires template-id tokens");
|
|
|
|
TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
|
|
assert(TemplateId->mightBeType() &&
|
|
"Only works for type and dependent templates");
|
|
|
|
ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
|
|
TemplateId->NumArgs);
|
|
|
|
TypeResult Type =
|
|
TemplateId->isInvalid()
|
|
? TypeError()
|
|
: Actions.ActOnTemplateIdType(
|
|
getCurScope(), SS, TemplateId->TemplateKWLoc,
|
|
TemplateId->Template, TemplateId->Name,
|
|
TemplateId->TemplateNameLoc, TemplateId->LAngleLoc,
|
|
TemplateArgsPtr, TemplateId->RAngleLoc,
|
|
/*IsCtorOrDtorName*/ false, IsClassName);
|
|
// Create the new "type" annotation token.
|
|
Tok.setKind(tok::annot_typename);
|
|
setTypeAnnotation(Tok, Type);
|
|
if (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);
|
|
}
|
|
|
|
/// Determine whether the given token can end a template argument.
|
|
static bool isEndOfTemplateArgument(Token Tok) {
|
|
// FIXME: Handle '>>>'.
|
|
return Tok.isOneOf(tok::comma, tok::greater, tok::greatergreater,
|
|
tok::greatergreatergreater);
|
|
}
|
|
|
|
/// 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, /*ObjectType=*/nullptr,
|
|
/*ObjectHadErrors=*/false,
|
|
/*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 (possibly-dependent) template name that could be a template template
|
|
// argument.
|
|
TemplateTy Template;
|
|
if (isEndOfTemplateArgument(Tok) &&
|
|
Actions.ActOnTemplateName(getCurScope(), SS, TemplateKWLoc, Name,
|
|
/*ObjectType=*/nullptr,
|
|
/*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=*/nullptr,
|
|
/*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 - and isCXXTypeId might look
|
|
// up and annotate an identifier as an id-expression during disambiguation,
|
|
// so enter the appropriate context for a constant expression template
|
|
// argument before trying to disambiguate.
|
|
|
|
EnterExpressionEvaluationContext EnterConstantEvaluated(
|
|
Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated,
|
|
/*LambdaContextDecl=*/nullptr,
|
|
/*ExprContext=*/Sema::ExpressionEvaluationContextRecord::EK_TemplateArgument);
|
|
if (isCXXTypeId(TypeIdAsTemplateArgument)) {
|
|
TypeResult TypeArg = ParseTypeName(
|
|
/*Range=*/nullptr, DeclaratorContext::TemplateArg);
|
|
return Actions.ActOnTemplateTypeArgument(TypeArg);
|
|
}
|
|
|
|
// 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 = ParseConstantExpressionInExprEvalContext(MaybeTypeCast);
|
|
if (ExprArg.isInvalid() || !ExprArg.get()) {
|
|
return ParsedTemplateArgument();
|
|
}
|
|
|
|
return ParsedTemplateArgument(ParsedTemplateArgument::NonType,
|
|
ExprArg.get(), 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) {
|
|
|
|
ColonProtectionRAIIObject ColonProtection(*this, false);
|
|
|
|
do {
|
|
ParsedTemplateArgument Arg = ParseTemplateArgument();
|
|
SourceLocation EllipsisLoc;
|
|
if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
|
|
Arg = Actions.ActOnPackExpansion(Arg, EllipsisLoc);
|
|
|
|
if (Arg.isInvalid())
|
|
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;
|
|
}
|
|
|
|
/// 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(DeclaratorContext Context,
|
|
SourceLocation ExternLoc,
|
|
SourceLocation TemplateLoc,
|
|
SourceLocation &DeclEnd,
|
|
ParsedAttributes &AccessAttrs,
|
|
AccessSpecifier AS) {
|
|
// This isn't really required here.
|
|
ParsingDeclRAIIObject
|
|
ParsingTemplateParams(*this, ParsingDeclRAIIObject::NoParent);
|
|
|
|
return ParseSingleDeclarationAfterTemplate(
|
|
Context, ParsedTemplateInfo(ExternLoc, TemplateLoc),
|
|
ParsingTemplateParams, DeclEnd, AccessAttrs, 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);
|
|
}
|
|
|
|
/// Late parse a C++ function template in Microsoft mode.
|
|
void Parser::ParseLateTemplatedFuncDef(LateParsedTemplate &LPT) {
|
|
if (!LPT.D)
|
|
return;
|
|
|
|
// Destroy TemplateIdAnnotations when we're done, if possible.
|
|
DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
|
|
|
|
// 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.Context.getTranslationUnitDecl());
|
|
|
|
MultiParseScope Scopes(*this);
|
|
|
|
// Get the list of DeclContexts to reenter.
|
|
SmallVector<DeclContext*, 4> DeclContextsToReenter;
|
|
for (DeclContext *DC = FunD; DC && !DC->isTranslationUnit();
|
|
DC = DC->getLexicalParent())
|
|
DeclContextsToReenter.push_back(DC);
|
|
|
|
// Reenter scopes from outermost to innermost.
|
|
for (DeclContext *DC : reverse(DeclContextsToReenter)) {
|
|
CurTemplateDepthTracker.addDepth(
|
|
ReenterTemplateScopes(Scopes, cast<Decl>(DC)));
|
|
Scopes.Enter(Scope::DeclScope);
|
|
// We'll reenter the function context itself below.
|
|
if (DC != FunD)
|
|
Actions.PushDeclContext(Actions.getCurScope(), DC);
|
|
}
|
|
|
|
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, true, /*IsReinject*/true);
|
|
|
|
// Consume the previously pushed token.
|
|
ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
|
|
assert(Tok.isOneOf(tok::l_brace, tok::colon, 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 |
|
|
Scope::CompoundStmtScope);
|
|
|
|
// Recreate the containing function DeclContext.
|
|
Sema::ContextRAII FunctionSavedContext(Actions, FunD->getLexicalParent());
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
/// 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);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// We've parsed something that could plausibly be intended to be a template
|
|
/// name (\p LHS) followed by a '<' token, and the following code can't possibly
|
|
/// be an expression. Determine if this is likely to be a template-id and if so,
|
|
/// diagnose it.
|
|
bool Parser::diagnoseUnknownTemplateId(ExprResult LHS, SourceLocation Less) {
|
|
TentativeParsingAction TPA(*this);
|
|
// FIXME: We could look at the token sequence in a lot more detail here.
|
|
if (SkipUntil(tok::greater, tok::greatergreater, tok::greatergreatergreater,
|
|
StopAtSemi | StopBeforeMatch)) {
|
|
TPA.Commit();
|
|
|
|
SourceLocation Greater;
|
|
ParseGreaterThanInTemplateList(Less, Greater, true, false);
|
|
Actions.diagnoseExprIntendedAsTemplateName(getCurScope(), LHS,
|
|
Less, Greater);
|
|
return true;
|
|
}
|
|
|
|
// There's no matching '>' token, this probably isn't supposed to be
|
|
// interpreted as a template-id. Parse it as an (ill-formed) comparison.
|
|
TPA.Revert();
|
|
return false;
|
|
}
|
|
|
|
void Parser::checkPotentialAngleBracket(ExprResult &PotentialTemplateName) {
|
|
assert(Tok.is(tok::less) && "not at a potential angle bracket");
|
|
|
|
bool DependentTemplateName = false;
|
|
if (!Actions.mightBeIntendedToBeTemplateName(PotentialTemplateName,
|
|
DependentTemplateName))
|
|
return;
|
|
|
|
// OK, this might be a name that the user intended to be parsed as a
|
|
// template-name, followed by a '<' token. Check for some easy cases.
|
|
|
|
// If we have potential_template<>, then it's supposed to be a template-name.
|
|
if (NextToken().is(tok::greater) ||
|
|
(getLangOpts().CPlusPlus11 &&
|
|
NextToken().isOneOf(tok::greatergreater, tok::greatergreatergreater))) {
|
|
SourceLocation Less = ConsumeToken();
|
|
SourceLocation Greater;
|
|
ParseGreaterThanInTemplateList(Less, Greater, true, false);
|
|
Actions.diagnoseExprIntendedAsTemplateName(
|
|
getCurScope(), PotentialTemplateName, Less, Greater);
|
|
// FIXME: Perform error recovery.
|
|
PotentialTemplateName = ExprError();
|
|
return;
|
|
}
|
|
|
|
// If we have 'potential_template<type-id', assume it's supposed to be a
|
|
// template-name if there's a matching '>' later on.
|
|
{
|
|
// FIXME: Avoid the tentative parse when NextToken() can't begin a type.
|
|
TentativeParsingAction TPA(*this);
|
|
SourceLocation Less = ConsumeToken();
|
|
if (isTypeIdUnambiguously() &&
|
|
diagnoseUnknownTemplateId(PotentialTemplateName, Less)) {
|
|
TPA.Commit();
|
|
// FIXME: Perform error recovery.
|
|
PotentialTemplateName = ExprError();
|
|
return;
|
|
}
|
|
TPA.Revert();
|
|
}
|
|
|
|
// Otherwise, remember that we saw this in case we see a potentially-matching
|
|
// '>' token later on.
|
|
AngleBracketTracker::Priority Priority =
|
|
(DependentTemplateName ? AngleBracketTracker::DependentName
|
|
: AngleBracketTracker::PotentialTypo) |
|
|
(Tok.hasLeadingSpace() ? AngleBracketTracker::SpaceBeforeLess
|
|
: AngleBracketTracker::NoSpaceBeforeLess);
|
|
AngleBrackets.add(*this, PotentialTemplateName.get(), Tok.getLocation(),
|
|
Priority);
|
|
}
|
|
|
|
bool Parser::checkPotentialAngleBracketDelimiter(
|
|
const AngleBracketTracker::Loc &LAngle, const Token &OpToken) {
|
|
// If a comma in an expression context is followed by a type that can be a
|
|
// template argument and cannot be an expression, then this is ill-formed,
|
|
// but might be intended to be part of a template-id.
|
|
if (OpToken.is(tok::comma) && isTypeIdUnambiguously() &&
|
|
diagnoseUnknownTemplateId(LAngle.TemplateName, LAngle.LessLoc)) {
|
|
AngleBrackets.clear(*this);
|
|
return true;
|
|
}
|
|
|
|
// If a context that looks like a template-id is followed by '()', then
|
|
// this is ill-formed, but might be intended to be a template-id
|
|
// followed by '()'.
|
|
if (OpToken.is(tok::greater) && Tok.is(tok::l_paren) &&
|
|
NextToken().is(tok::r_paren)) {
|
|
Actions.diagnoseExprIntendedAsTemplateName(
|
|
getCurScope(), LAngle.TemplateName, LAngle.LessLoc,
|
|
OpToken.getLocation());
|
|
AngleBrackets.clear(*this);
|
|
return true;
|
|
}
|
|
|
|
// After a '>' (etc), we're no longer potentially in a construct that's
|
|
// intended to be treated as a template-id.
|
|
if (OpToken.is(tok::greater) ||
|
|
(getLangOpts().CPlusPlus11 &&
|
|
OpToken.isOneOf(tok::greatergreater, tok::greatergreatergreater)))
|
|
AngleBrackets.clear(*this);
|
|
return false;
|
|
}
|