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ParseDeclCXX.cpp
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//===--- ParseDeclCXX.cpp - C++ Declaration Parsing -------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the C++ Declaration portions of the Parser interfaces.
//
//===----------------------------------------------------------------------===//
#include "clang/Parse/Parser.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/DeclTemplate.h"
#include "clang/AST/PrettyDeclStackTrace.h"
#include "clang/Basic/Attributes.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/OperatorKinds.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Parse/ParseDiagnostic.h"
#include "clang/Parse/RAIIObjectsForParser.h"
#include "clang/Sema/DeclSpec.h"
#include "clang/Sema/ParsedTemplate.h"
#include "clang/Sema/Scope.h"
#include "clang/Sema/SemaDiagnostic.h"
#include "llvm/ADT/SmallString.h"
using namespace clang;
/// ParseNamespace - We know that the current token is a namespace keyword. This
/// may either be a top level namespace or a block-level namespace alias. If
/// there was an inline keyword, it has already been parsed.
///
/// namespace-definition: [C++ 7.3: basic.namespace]
/// named-namespace-definition
/// unnamed-namespace-definition
///
/// unnamed-namespace-definition:
/// 'inline'[opt] 'namespace' attributes[opt] '{' namespace-body '}'
///
/// named-namespace-definition:
/// original-namespace-definition
/// extension-namespace-definition
///
/// original-namespace-definition:
/// 'inline'[opt] 'namespace' identifier attributes[opt]
/// '{' namespace-body '}'
///
/// extension-namespace-definition:
/// 'inline'[opt] 'namespace' original-namespace-name
/// '{' namespace-body '}'
///
/// namespace-alias-definition: [C++ 7.3.2: namespace.alias]
/// 'namespace' identifier '=' qualified-namespace-specifier ';'
///
Parser::DeclGroupPtrTy Parser::ParseNamespace(DeclaratorContext Context,
SourceLocation &DeclEnd,
SourceLocation InlineLoc) {
assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'.
ObjCDeclContextSwitch ObjCDC(*this);
if (Tok.is(tok::code_completion)) {
Actions.CodeCompleteNamespaceDecl(getCurScope());
cutOffParsing();
return nullptr;
}
SourceLocation IdentLoc;
IdentifierInfo *Ident = nullptr;
std::vector<SourceLocation> ExtraIdentLoc;
std::vector<IdentifierInfo*> ExtraIdent;
std::vector<SourceLocation> ExtraNamespaceLoc;
ParsedAttributesWithRange attrs(AttrFactory);
SourceLocation attrLoc;
if (getLangOpts().CPlusPlus11 && isCXX11AttributeSpecifier()) {
Diag(Tok.getLocation(), getLangOpts().CPlusPlus17
? diag::warn_cxx14_compat_ns_enum_attribute
: diag::ext_ns_enum_attribute)
<< 0 /*namespace*/;
attrLoc = Tok.getLocation();
ParseCXX11Attributes(attrs);
}
if (Tok.is(tok::identifier)) {
Ident = Tok.getIdentifierInfo();
IdentLoc = ConsumeToken(); // eat the identifier.
while (Tok.is(tok::coloncolon) && NextToken().is(tok::identifier)) {
ExtraNamespaceLoc.push_back(ConsumeToken());
ExtraIdent.push_back(Tok.getIdentifierInfo());
ExtraIdentLoc.push_back(ConsumeToken());
}
}
// A nested namespace definition cannot have attributes.
if (!ExtraNamespaceLoc.empty() && attrLoc.isValid())
Diag(attrLoc, diag::err_unexpected_nested_namespace_attribute);
// Read label attributes, if present.
if (Tok.is(tok::kw___attribute)) {
attrLoc = Tok.getLocation();
ParseGNUAttributes(attrs);
}
if (Tok.is(tok::equal)) {
if (!Ident) {
Diag(Tok, diag::err_expected) << tok::identifier;
// Skip to end of the definition and eat the ';'.
SkipUntil(tok::semi);
return nullptr;
}
if (attrLoc.isValid())
Diag(attrLoc, diag::err_unexpected_namespace_attributes_alias);
if (InlineLoc.isValid())
Diag(InlineLoc, diag::err_inline_namespace_alias)
<< FixItHint::CreateRemoval(InlineLoc);
Decl *NSAlias = ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
return Actions.ConvertDeclToDeclGroup(NSAlias);
}
BalancedDelimiterTracker T(*this, tok::l_brace);
if (T.consumeOpen()) {
if (Ident)
Diag(Tok, diag::err_expected) << tok::l_brace;
else
Diag(Tok, diag::err_expected_either) << tok::identifier << tok::l_brace;
return nullptr;
}
if (getCurScope()->isClassScope() || getCurScope()->isTemplateParamScope() ||
getCurScope()->isInObjcMethodScope() || getCurScope()->getBlockParent() ||
getCurScope()->getFnParent()) {
Diag(T.getOpenLocation(), diag::err_namespace_nonnamespace_scope);
SkipUntil(tok::r_brace);
return nullptr;
}
if (ExtraIdent.empty()) {
// Normal namespace definition, not a nested-namespace-definition.
} else if (InlineLoc.isValid()) {
Diag(InlineLoc, diag::err_inline_nested_namespace_definition);
} else if (getLangOpts().CPlusPlus17) {
Diag(ExtraNamespaceLoc[0],
diag::warn_cxx14_compat_nested_namespace_definition);
} else {
TentativeParsingAction TPA(*this);
SkipUntil(tok::r_brace, StopBeforeMatch);
Token rBraceToken = Tok;
TPA.Revert();
if (!rBraceToken.is(tok::r_brace)) {
Diag(ExtraNamespaceLoc[0], diag::ext_nested_namespace_definition)
<< SourceRange(ExtraNamespaceLoc.front(), ExtraIdentLoc.back());
} else {
std::string NamespaceFix;
for (std::vector<IdentifierInfo*>::iterator I = ExtraIdent.begin(),
E = ExtraIdent.end(); I != E; ++I) {
NamespaceFix += " { namespace ";
NamespaceFix += (*I)->getName();
}
std::string RBraces;
for (unsigned i = 0, e = ExtraIdent.size(); i != e; ++i)
RBraces += "} ";
Diag(ExtraNamespaceLoc[0], diag::ext_nested_namespace_definition)
<< FixItHint::CreateReplacement(SourceRange(ExtraNamespaceLoc.front(),
ExtraIdentLoc.back()),
NamespaceFix)
<< FixItHint::CreateInsertion(rBraceToken.getLocation(), RBraces);
}
}
// If we're still good, complain about inline namespaces in non-C++0x now.
if (InlineLoc.isValid())
Diag(InlineLoc, getLangOpts().CPlusPlus11 ?
diag::warn_cxx98_compat_inline_namespace : diag::ext_inline_namespace);
// Enter a scope for the namespace.
ParseScope NamespaceScope(this, Scope::DeclScope);
UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr;
Decl *NamespcDecl =
Actions.ActOnStartNamespaceDef(getCurScope(), InlineLoc, NamespaceLoc,
IdentLoc, Ident, T.getOpenLocation(),
attrs.getList(), ImplicitUsingDirectiveDecl);
PrettyDeclStackTraceEntry CrashInfo(Actions.Context, NamespcDecl,
NamespaceLoc, "parsing namespace");
// Parse the contents of the namespace. This includes parsing recovery on
// any improperly nested namespaces.
ParseInnerNamespace(ExtraIdentLoc, ExtraIdent, ExtraNamespaceLoc, 0,
InlineLoc, attrs, T);
// Leave the namespace scope.
NamespaceScope.Exit();
DeclEnd = T.getCloseLocation();
Actions.ActOnFinishNamespaceDef(NamespcDecl, DeclEnd);
return Actions.ConvertDeclToDeclGroup(NamespcDecl,
ImplicitUsingDirectiveDecl);
}
/// ParseInnerNamespace - Parse the contents of a namespace.
void Parser::ParseInnerNamespace(std::vector<SourceLocation> &IdentLoc,
std::vector<IdentifierInfo *> &Ident,
std::vector<SourceLocation> &NamespaceLoc,
unsigned int index, SourceLocation &InlineLoc,
ParsedAttributes &attrs,
BalancedDelimiterTracker &Tracker) {
if (index == Ident.size()) {
while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
Tok.isNot(tok::eof)) {
ParsedAttributesWithRange attrs(AttrFactory);
MaybeParseCXX11Attributes(attrs);
ParseExternalDeclaration(attrs);
}
// The caller is what called check -- we are simply calling
// the close for it.
Tracker.consumeClose();
return;
}
// Handle a nested namespace definition.
// FIXME: Preserve the source information through to the AST rather than
// desugaring it here.
ParseScope NamespaceScope(this, Scope::DeclScope);
UsingDirectiveDecl *ImplicitUsingDirectiveDecl = nullptr;
Decl *NamespcDecl =
Actions.ActOnStartNamespaceDef(getCurScope(), SourceLocation(),
NamespaceLoc[index], IdentLoc[index],
Ident[index], Tracker.getOpenLocation(),
attrs.getList(), ImplicitUsingDirectiveDecl);
assert(!ImplicitUsingDirectiveDecl &&
"nested namespace definition cannot define anonymous namespace");
ParseInnerNamespace(IdentLoc, Ident, NamespaceLoc, ++index, InlineLoc,
attrs, Tracker);
NamespaceScope.Exit();
Actions.ActOnFinishNamespaceDef(NamespcDecl, Tracker.getCloseLocation());
}
/// ParseNamespaceAlias - Parse the part after the '=' in a namespace
/// alias definition.
///
Decl *Parser::ParseNamespaceAlias(SourceLocation NamespaceLoc,
SourceLocation AliasLoc,
IdentifierInfo *Alias,
SourceLocation &DeclEnd) {
assert(Tok.is(tok::equal) && "Not equal token");
ConsumeToken(); // eat the '='.
if (Tok.is(tok::code_completion)) {
Actions.CodeCompleteNamespaceAliasDecl(getCurScope());
cutOffParsing();
return nullptr;
}
CXXScopeSpec SS;
// Parse (optional) nested-name-specifier.
ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false,
/*MayBePseudoDestructor=*/nullptr,
/*IsTypename=*/false,
/*LastII=*/nullptr,
/*OnlyNamespace=*/true);
if (Tok.isNot(tok::identifier)) {
Diag(Tok, diag::err_expected_namespace_name);
// Skip to end of the definition and eat the ';'.
SkipUntil(tok::semi);
return nullptr;
}
if (SS.isInvalid()) {
// Diagnostics have been emitted in ParseOptionalCXXScopeSpecifier.
// Skip to end of the definition and eat the ';'.
SkipUntil(tok::semi);
return nullptr;
}
// Parse identifier.
IdentifierInfo *Ident = Tok.getIdentifierInfo();
SourceLocation IdentLoc = ConsumeToken();
// Eat the ';'.
DeclEnd = Tok.getLocation();
if (ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name))
SkipUntil(tok::semi);
return Actions.ActOnNamespaceAliasDef(getCurScope(), NamespaceLoc, AliasLoc,
Alias, SS, IdentLoc, Ident);
}
/// ParseLinkage - We know that the current token is a string_literal
/// and just before that, that extern was seen.
///
/// linkage-specification: [C++ 7.5p2: dcl.link]
/// 'extern' string-literal '{' declaration-seq[opt] '}'
/// 'extern' string-literal declaration
///
Decl *Parser::ParseLinkage(ParsingDeclSpec &DS, DeclaratorContext Context) {
assert(isTokenStringLiteral() && "Not a string literal!");
ExprResult Lang = ParseStringLiteralExpression(false);
ParseScope LinkageScope(this, Scope::DeclScope);
Decl *LinkageSpec =
Lang.isInvalid()
? nullptr
: Actions.ActOnStartLinkageSpecification(
getCurScope(), DS.getSourceRange().getBegin(), Lang.get(),
Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation());
ParsedAttributesWithRange attrs(AttrFactory);
MaybeParseCXX11Attributes(attrs);
if (Tok.isNot(tok::l_brace)) {
// Reset the source range in DS, as the leading "extern"
// does not really belong to the inner declaration ...
DS.SetRangeStart(SourceLocation());
DS.SetRangeEnd(SourceLocation());
// ... but anyway remember that such an "extern" was seen.
DS.setExternInLinkageSpec(true);
ParseExternalDeclaration(attrs, &DS);
return LinkageSpec ? Actions.ActOnFinishLinkageSpecification(
getCurScope(), LinkageSpec, SourceLocation())
: nullptr;
}
DS.abort();
ProhibitAttributes(attrs);
BalancedDelimiterTracker T(*this, tok::l_brace);
T.consumeOpen();
unsigned NestedModules = 0;
while (true) {
switch (Tok.getKind()) {
case tok::annot_module_begin:
++NestedModules;
ParseTopLevelDecl();
continue;
case tok::annot_module_end:
if (!NestedModules)
break;
--NestedModules;
ParseTopLevelDecl();
continue;
case tok::annot_module_include:
ParseTopLevelDecl();
continue;
case tok::eof:
break;
case tok::r_brace:
if (!NestedModules)
break;
// Fall through.
default:
ParsedAttributesWithRange attrs(AttrFactory);
MaybeParseCXX11Attributes(attrs);
ParseExternalDeclaration(attrs);
continue;
}
break;
}
T.consumeClose();
return LinkageSpec ? Actions.ActOnFinishLinkageSpecification(
getCurScope(), LinkageSpec, T.getCloseLocation())
: nullptr;
}
/// Parse a C++ Modules TS export-declaration.
///
/// export-declaration:
/// 'export' declaration
/// 'export' '{' declaration-seq[opt] '}'
///
Decl *Parser::ParseExportDeclaration() {
assert(Tok.is(tok::kw_export));
SourceLocation ExportLoc = ConsumeToken();
ParseScope ExportScope(this, Scope::DeclScope);
Decl *ExportDecl = Actions.ActOnStartExportDecl(
getCurScope(), ExportLoc,
Tok.is(tok::l_brace) ? Tok.getLocation() : SourceLocation());
if (Tok.isNot(tok::l_brace)) {
// FIXME: Factor out a ParseExternalDeclarationWithAttrs.
ParsedAttributesWithRange Attrs(AttrFactory);
MaybeParseCXX11Attributes(Attrs);
MaybeParseMicrosoftAttributes(Attrs);
ParseExternalDeclaration(Attrs);
return Actions.ActOnFinishExportDecl(getCurScope(), ExportDecl,
SourceLocation());
}
BalancedDelimiterTracker T(*this, tok::l_brace);
T.consumeOpen();
// The Modules TS draft says "An export-declaration shall declare at least one
// entity", but the intent is that it shall contain at least one declaration.
if (Tok.is(tok::r_brace))
Diag(ExportLoc, diag::err_export_empty)
<< SourceRange(ExportLoc, Tok.getLocation());
while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
Tok.isNot(tok::eof)) {
ParsedAttributesWithRange Attrs(AttrFactory);
MaybeParseCXX11Attributes(Attrs);
MaybeParseMicrosoftAttributes(Attrs);
ParseExternalDeclaration(Attrs);
}
T.consumeClose();
return Actions.ActOnFinishExportDecl(getCurScope(), ExportDecl,
T.getCloseLocation());
}
/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
/// using-directive. Assumes that current token is 'using'.
Parser::DeclGroupPtrTy
Parser::ParseUsingDirectiveOrDeclaration(DeclaratorContext Context,
const ParsedTemplateInfo &TemplateInfo,
SourceLocation &DeclEnd,
ParsedAttributesWithRange &attrs) {
assert(Tok.is(tok::kw_using) && "Not using token");
ObjCDeclContextSwitch ObjCDC(*this);
// Eat 'using'.
SourceLocation UsingLoc = ConsumeToken();
if (Tok.is(tok::code_completion)) {
Actions.CodeCompleteUsing(getCurScope());
cutOffParsing();
return nullptr;
}
// 'using namespace' means this is a using-directive.
if (Tok.is(tok::kw_namespace)) {
// Template parameters are always an error here.
if (TemplateInfo.Kind) {
SourceRange R = TemplateInfo.getSourceRange();
Diag(UsingLoc, diag::err_templated_using_directive_declaration)
<< 0 /* directive */ << R << FixItHint::CreateRemoval(R);
}
Decl *UsingDir = ParseUsingDirective(Context, UsingLoc, DeclEnd, attrs);
return Actions.ConvertDeclToDeclGroup(UsingDir);
}
// Otherwise, it must be a using-declaration or an alias-declaration.
// Using declarations can't have attributes.
ProhibitAttributes(attrs);
return ParseUsingDeclaration(Context, TemplateInfo, UsingLoc, DeclEnd,
AS_none);
}
/// ParseUsingDirective - Parse C++ using-directive, assumes
/// that current token is 'namespace' and 'using' was already parsed.
///
/// using-directive: [C++ 7.3.p4: namespace.udir]
/// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
/// namespace-name ;
/// [GNU] using-directive:
/// 'using' 'namespace' ::[opt] nested-name-specifier[opt]
/// namespace-name attributes[opt] ;
///
Decl *Parser::ParseUsingDirective(DeclaratorContext Context,
SourceLocation UsingLoc,
SourceLocation &DeclEnd,
ParsedAttributes &attrs) {
assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
// Eat 'namespace'.
SourceLocation NamespcLoc = ConsumeToken();
if (Tok.is(tok::code_completion)) {
Actions.CodeCompleteUsingDirective(getCurScope());
cutOffParsing();
return nullptr;
}
CXXScopeSpec SS;
// Parse (optional) nested-name-specifier.
ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false,
/*MayBePseudoDestructor=*/nullptr,
/*IsTypename=*/false,
/*LastII=*/nullptr,
/*OnlyNamespace=*/true);
IdentifierInfo *NamespcName = nullptr;
SourceLocation IdentLoc = SourceLocation();
// Parse namespace-name.
if (Tok.isNot(tok::identifier)) {
Diag(Tok, diag::err_expected_namespace_name);
// If there was invalid namespace name, skip to end of decl, and eat ';'.
SkipUntil(tok::semi);
// FIXME: Are there cases, when we would like to call ActOnUsingDirective?
return nullptr;
}
if (SS.isInvalid()) {
// Diagnostics have been emitted in ParseOptionalCXXScopeSpecifier.
// Skip to end of the definition and eat the ';'.
SkipUntil(tok::semi);
return nullptr;
}
// Parse identifier.
NamespcName = Tok.getIdentifierInfo();
IdentLoc = ConsumeToken();
// Parse (optional) attributes (most likely GNU strong-using extension).
bool GNUAttr = false;
if (Tok.is(tok::kw___attribute)) {
GNUAttr = true;
ParseGNUAttributes(attrs);
}
// Eat ';'.
DeclEnd = Tok.getLocation();
if (ExpectAndConsume(tok::semi,
GNUAttr ? diag::err_expected_semi_after_attribute_list
: diag::err_expected_semi_after_namespace_name))
SkipUntil(tok::semi);
return Actions.ActOnUsingDirective(getCurScope(), UsingLoc, NamespcLoc, SS,
IdentLoc, NamespcName, attrs.getList());
}
/// Parse a using-declarator (or the identifier in a C++11 alias-declaration).
///
/// using-declarator:
/// 'typename'[opt] nested-name-specifier unqualified-id
///
bool Parser::ParseUsingDeclarator(DeclaratorContext Context,
UsingDeclarator &D) {
D.clear();
// Ignore optional 'typename'.
// FIXME: This is wrong; we should parse this as a typename-specifier.
TryConsumeToken(tok::kw_typename, D.TypenameLoc);
if (Tok.is(tok::kw___super)) {
Diag(Tok.getLocation(), diag::err_super_in_using_declaration);
return true;
}
// Parse nested-name-specifier.
IdentifierInfo *LastII = nullptr;
ParseOptionalCXXScopeSpecifier(D.SS, nullptr, /*EnteringContext=*/false,
/*MayBePseudoDtor=*/nullptr,
/*IsTypename=*/false,
/*LastII=*/&LastII);
if (D.SS.isInvalid())
return true;
// Parse the unqualified-id. We allow parsing of both constructor and
// destructor names and allow the action module to diagnose any semantic
// errors.
//
// C++11 [class.qual]p2:
// [...] in a using-declaration that is a member-declaration, if the name
// specified after the nested-name-specifier is the same as the identifier
// or the simple-template-id's template-name in the last component of the
// nested-name-specifier, the name is [...] considered to name the
// constructor.
if (getLangOpts().CPlusPlus11 &&
Context == DeclaratorContext::MemberContext &&
Tok.is(tok::identifier) &&
(NextToken().is(tok::semi) || NextToken().is(tok::comma) ||
NextToken().is(tok::ellipsis)) &&
D.SS.isNotEmpty() && LastII == Tok.getIdentifierInfo() &&
!D.SS.getScopeRep()->getAsNamespace() &&
!D.SS.getScopeRep()->getAsNamespaceAlias()) {
SourceLocation IdLoc = ConsumeToken();
ParsedType Type =
Actions.getInheritingConstructorName(D.SS, IdLoc, *LastII);
D.Name.setConstructorName(Type, IdLoc, IdLoc);
} else {
if (ParseUnqualifiedId(
D.SS, /*EnteringContext=*/false,
/*AllowDestructorName=*/true,
/*AllowConstructorName=*/!(Tok.is(tok::identifier) &&
NextToken().is(tok::equal)),
/*AllowDeductionGuide=*/false,
nullptr, D.TemplateKWLoc, D.Name))
return true;
}
if (TryConsumeToken(tok::ellipsis, D.EllipsisLoc))
Diag(Tok.getLocation(), getLangOpts().CPlusPlus17 ?
diag::warn_cxx17_compat_using_declaration_pack :
diag::ext_using_declaration_pack);
return false;
}
/// ParseUsingDeclaration - Parse C++ using-declaration or alias-declaration.
/// Assumes that 'using' was already seen.
///
/// using-declaration: [C++ 7.3.p3: namespace.udecl]
/// 'using' using-declarator-list[opt] ;
///
/// using-declarator-list: [C++1z]
/// using-declarator '...'[opt]
/// using-declarator-list ',' using-declarator '...'[opt]
///
/// using-declarator-list: [C++98-14]
/// using-declarator
///
/// alias-declaration: C++11 [dcl.dcl]p1
/// 'using' identifier attribute-specifier-seq[opt] = type-id ;
///
Parser::DeclGroupPtrTy
Parser::ParseUsingDeclaration(DeclaratorContext Context,
const ParsedTemplateInfo &TemplateInfo,
SourceLocation UsingLoc, SourceLocation &DeclEnd,
AccessSpecifier AS) {
// Check for misplaced attributes before the identifier in an
// alias-declaration.
ParsedAttributesWithRange MisplacedAttrs(AttrFactory);
MaybeParseCXX11Attributes(MisplacedAttrs);
UsingDeclarator D;
bool InvalidDeclarator = ParseUsingDeclarator(Context, D);
ParsedAttributesWithRange Attrs(AttrFactory);
MaybeParseGNUAttributes(Attrs);
MaybeParseCXX11Attributes(Attrs);
// Maybe this is an alias-declaration.
if (Tok.is(tok::equal)) {
if (InvalidDeclarator) {
SkipUntil(tok::semi);
return nullptr;
}
// If we had any misplaced attributes from earlier, this is where they
// should have been written.
if (MisplacedAttrs.Range.isValid()) {
Diag(MisplacedAttrs.Range.getBegin(), diag::err_attributes_not_allowed)
<< FixItHint::CreateInsertionFromRange(
Tok.getLocation(),
CharSourceRange::getTokenRange(MisplacedAttrs.Range))
<< FixItHint::CreateRemoval(MisplacedAttrs.Range);
Attrs.takeAllFrom(MisplacedAttrs);
}
Decl *DeclFromDeclSpec = nullptr;
Decl *AD = ParseAliasDeclarationAfterDeclarator(
TemplateInfo, UsingLoc, D, DeclEnd, AS, Attrs, &DeclFromDeclSpec);
return Actions.ConvertDeclToDeclGroup(AD, DeclFromDeclSpec);
}
// C++11 attributes are not allowed on a using-declaration, but GNU ones
// are.
ProhibitAttributes(MisplacedAttrs);
ProhibitAttributes(Attrs);
// Diagnose an attempt to declare a templated using-declaration.
// In C++11, alias-declarations can be templates:
// template <...> using id = type;
if (TemplateInfo.Kind) {
SourceRange R = TemplateInfo.getSourceRange();
Diag(UsingLoc, diag::err_templated_using_directive_declaration)
<< 1 /* declaration */ << R << FixItHint::CreateRemoval(R);
// Unfortunately, we have to bail out instead of recovering by
// ignoring the parameters, just in case the nested name specifier
// depends on the parameters.
return nullptr;
}
SmallVector<Decl *, 8> DeclsInGroup;
while (true) {
// Parse (optional) attributes (most likely GNU strong-using extension).
MaybeParseGNUAttributes(Attrs);
if (InvalidDeclarator)
SkipUntil(tok::comma, tok::semi, StopBeforeMatch);
else {
// "typename" keyword is allowed for identifiers only,
// because it may be a type definition.
if (D.TypenameLoc.isValid() &&
D.Name.getKind() != UnqualifiedIdKind::IK_Identifier) {
Diag(D.Name.getSourceRange().getBegin(),
diag::err_typename_identifiers_only)
<< FixItHint::CreateRemoval(SourceRange(D.TypenameLoc));
// Proceed parsing, but discard the typename keyword.
D.TypenameLoc = SourceLocation();
}
Decl *UD = Actions.ActOnUsingDeclaration(getCurScope(), AS, UsingLoc,
D.TypenameLoc, D.SS, D.Name,
D.EllipsisLoc, Attrs.getList());
if (UD)
DeclsInGroup.push_back(UD);
}
if (!TryConsumeToken(tok::comma))
break;
// Parse another using-declarator.
Attrs.clear();
InvalidDeclarator = ParseUsingDeclarator(Context, D);
}
if (DeclsInGroup.size() > 1)
Diag(Tok.getLocation(), getLangOpts().CPlusPlus17 ?
diag::warn_cxx17_compat_multi_using_declaration :
diag::ext_multi_using_declaration);
// Eat ';'.
DeclEnd = Tok.getLocation();
if (ExpectAndConsume(tok::semi, diag::err_expected_after,
!Attrs.empty() ? "attributes list"
: "using declaration"))
SkipUntil(tok::semi);
return Actions.BuildDeclaratorGroup(DeclsInGroup);
}
Decl *Parser::ParseAliasDeclarationAfterDeclarator(
const ParsedTemplateInfo &TemplateInfo, SourceLocation UsingLoc,
UsingDeclarator &D, SourceLocation &DeclEnd, AccessSpecifier AS,
ParsedAttributes &Attrs, Decl **OwnedType) {
if (ExpectAndConsume(tok::equal)) {
SkipUntil(tok::semi);
return nullptr;
}
Diag(Tok.getLocation(), getLangOpts().CPlusPlus11 ?
diag::warn_cxx98_compat_alias_declaration :
diag::ext_alias_declaration);
// Type alias templates cannot be specialized.
int SpecKind = -1;
if (TemplateInfo.Kind == ParsedTemplateInfo::Template &&
D.Name.getKind() == UnqualifiedIdKind::IK_TemplateId)
SpecKind = 0;
if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization)
SpecKind = 1;
if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
SpecKind = 2;
if (SpecKind != -1) {
SourceRange Range;
if (SpecKind == 0)
Range = SourceRange(D.Name.TemplateId->LAngleLoc,
D.Name.TemplateId->RAngleLoc);
else
Range = TemplateInfo.getSourceRange();
Diag(Range.getBegin(), diag::err_alias_declaration_specialization)
<< SpecKind << Range;
SkipUntil(tok::semi);
return nullptr;
}
// Name must be an identifier.
if (D.Name.getKind() != UnqualifiedIdKind::IK_Identifier) {
Diag(D.Name.StartLocation, diag::err_alias_declaration_not_identifier);
// No removal fixit: can't recover from this.
SkipUntil(tok::semi);
return nullptr;
} else if (D.TypenameLoc.isValid())
Diag(D.TypenameLoc, diag::err_alias_declaration_not_identifier)
<< FixItHint::CreateRemoval(SourceRange(
D.TypenameLoc,
D.SS.isNotEmpty() ? D.SS.getEndLoc() : D.TypenameLoc));
else if (D.SS.isNotEmpty())
Diag(D.SS.getBeginLoc(), diag::err_alias_declaration_not_identifier)
<< FixItHint::CreateRemoval(D.SS.getRange());
if (D.EllipsisLoc.isValid())
Diag(D.EllipsisLoc, diag::err_alias_declaration_pack_expansion)
<< FixItHint::CreateRemoval(SourceRange(D.EllipsisLoc));
Decl *DeclFromDeclSpec = nullptr;
TypeResult TypeAlias = ParseTypeName(
nullptr,
TemplateInfo.Kind ? DeclaratorContext::AliasTemplateContext
: DeclaratorContext::AliasDeclContext,
AS, &DeclFromDeclSpec, &Attrs);
if (OwnedType)
*OwnedType = DeclFromDeclSpec;
// Eat ';'.
DeclEnd = Tok.getLocation();
if (ExpectAndConsume(tok::semi, diag::err_expected_after,
!Attrs.empty() ? "attributes list"
: "alias declaration"))
SkipUntil(tok::semi);
TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
MultiTemplateParamsArg TemplateParamsArg(
TemplateParams ? TemplateParams->data() : nullptr,
TemplateParams ? TemplateParams->size() : 0);
return Actions.ActOnAliasDeclaration(getCurScope(), AS, TemplateParamsArg,
UsingLoc, D.Name, Attrs.getList(),
TypeAlias, DeclFromDeclSpec);
}
/// ParseStaticAssertDeclaration - Parse C++0x or C11 static_assert-declaration.
///
/// [C++0x] static_assert-declaration:
/// static_assert ( constant-expression , string-literal ) ;
///
/// [C11] static_assert-declaration:
/// _Static_assert ( constant-expression , string-literal ) ;
///
Decl *Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
assert(Tok.isOneOf(tok::kw_static_assert, tok::kw__Static_assert) &&
"Not a static_assert declaration");
if (Tok.is(tok::kw__Static_assert) && !getLangOpts().C11)
Diag(Tok, diag::ext_c11_static_assert);
if (Tok.is(tok::kw_static_assert))
Diag(Tok, diag::warn_cxx98_compat_static_assert);
SourceLocation StaticAssertLoc = ConsumeToken();
BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.consumeOpen()) {
Diag(Tok, diag::err_expected) << tok::l_paren;
SkipMalformedDecl();
return nullptr;
}
EnterExpressionEvaluationContext ConstantEvaluated(
Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
ExprResult AssertExpr(ParseConstantExpressionInExprEvalContext());
if (AssertExpr.isInvalid()) {
SkipMalformedDecl();
return nullptr;
}
ExprResult AssertMessage;
if (Tok.is(tok::r_paren)) {
Diag(Tok, getLangOpts().CPlusPlus17
? diag::warn_cxx14_compat_static_assert_no_message
: diag::ext_static_assert_no_message)
<< (getLangOpts().CPlusPlus17
? FixItHint()
: FixItHint::CreateInsertion(Tok.getLocation(), ", \"\""));
} else {
if (ExpectAndConsume(tok::comma)) {
SkipUntil(tok::semi);
return nullptr;
}
if (!isTokenStringLiteral()) {
Diag(Tok, diag::err_expected_string_literal)
<< /*Source='static_assert'*/1;
SkipMalformedDecl();
return nullptr;
}
AssertMessage = ParseStringLiteralExpression();
if (AssertMessage.isInvalid()) {
SkipMalformedDecl();
return nullptr;
}
}
T.consumeClose();
DeclEnd = Tok.getLocation();
ExpectAndConsumeSemi(diag::err_expected_semi_after_static_assert);
return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc,
AssertExpr.get(),
AssertMessage.get(),
T.getCloseLocation());
}
/// ParseDecltypeSpecifier - Parse a C++11 decltype specifier.
///
/// 'decltype' ( expression )
/// 'decltype' ( 'auto' ) [C++1y]
///
SourceLocation Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
assert(Tok.isOneOf(tok::kw_decltype, tok::annot_decltype)
&& "Not a decltype specifier");
ExprResult Result;
SourceLocation StartLoc = Tok.getLocation();
SourceLocation EndLoc;
if (Tok.is(tok::annot_decltype)) {
Result = getExprAnnotation(Tok);
EndLoc = Tok.getAnnotationEndLoc();
ConsumeAnnotationToken();
if (Result.isInvalid()) {
DS.SetTypeSpecError();
return EndLoc;
}
} else {
if (Tok.getIdentifierInfo()->isStr("decltype"))
Diag(Tok, diag::warn_cxx98_compat_decltype);
ConsumeToken();
BalancedDelimiterTracker T(*this, tok::l_paren);
if (T.expectAndConsume(diag::err_expected_lparen_after,
"decltype", tok::r_paren)) {
DS.SetTypeSpecError();
return T.getOpenLocation() == Tok.getLocation() ?
StartLoc : T.getOpenLocation();
}
// Check for C++1y 'decltype(auto)'.
if (Tok.is(tok::kw_auto)) {
// No need to disambiguate here: an expression can't start with 'auto',
// because the typename-specifier in a function-style cast operation can't
// be 'auto'.
Diag(Tok.getLocation(),
getLangOpts().CPlusPlus14
? diag::warn_cxx11_compat_decltype_auto_type_specifier
: diag::ext_decltype_auto_type_specifier);
ConsumeToken();
} else {
// Parse the expression
// C++11 [dcl.type.simple]p4:
// The operand of the decltype specifier is an unevaluated operand.
EnterExpressionEvaluationContext Unevaluated(
Actions, Sema::ExpressionEvaluationContext::Unevaluated, nullptr,
/*IsDecltype=*/true);
Result =
Actions.CorrectDelayedTyposInExpr(ParseExpression(), [](Expr *E) {
return E->hasPlaceholderType() ? ExprError() : E;
});
if (Result.isInvalid()) {
DS.SetTypeSpecError();
if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
EndLoc = ConsumeParen();
} else {
if (PP.isBacktrackEnabled() && Tok.is(tok::semi)) {
// Backtrack to get the location of the last token before the semi.
PP.RevertCachedTokens(2);
ConsumeToken(); // the semi.
EndLoc = ConsumeAnyToken();
assert(Tok.is(tok::semi));
} else {
EndLoc = Tok.getLocation();
}
}
return EndLoc;
}
Result = Actions.ActOnDecltypeExpression(Result.get());
}
// Match the ')'
T.consumeClose();
if (T.getCloseLocation().isInvalid()) {
DS.SetTypeSpecError();
// FIXME: this should return the location of the last token
// that was consumed (by "consumeClose()")
return T.getCloseLocation();
}
if (Result.isInvalid()) {
DS.SetTypeSpecError();
return T.getCloseLocation();
}
EndLoc = T.getCloseLocation();
}
assert(!Result.isInvalid());
const char *PrevSpec = nullptr;
unsigned DiagID;
const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
// Check for duplicate type specifiers (e.g. "int decltype(a)").
if (Result.get()
? DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
DiagID, Result.get(), Policy)
: DS.SetTypeSpecType(DeclSpec::TST_decltype_auto, StartLoc, PrevSpec,
DiagID, Policy)) {
Diag(StartLoc, DiagID) << PrevSpec;
DS.SetTypeSpecError();
}