llvm-project/clang/lib/Parse/ParseDeclCXX.cpp

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//===--- ParseDeclCXX.cpp - C++ Declaration Parsing -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the C++ Declaration portions of the Parser interfaces.
//
//===----------------------------------------------------------------------===//
#include "clang/Basic/OperatorKinds.h"
#include "clang/Parse/Parser.h"
#include "clang/Parse/ParseDiagnostic.h"
#include "clang/Parse/DeclSpec.h"
#include "clang/Parse/Scope.h"
#include "clang/Parse/Template.h"
#include "RAIIObjectsForParser.h"
using namespace clang;
/// 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.
///
/// namespace-definition: [C++ 7.3: basic.namespace]
/// named-namespace-definition
/// unnamed-namespace-definition
///
/// unnamed-namespace-definition:
/// 'namespace' attributes[opt] '{' namespace-body '}'
///
/// named-namespace-definition:
/// original-namespace-definition
/// extension-namespace-definition
///
/// original-namespace-definition:
/// 'namespace' identifier attributes[opt] '{' namespace-body '}'
///
/// extension-namespace-definition:
/// 'namespace' original-namespace-name '{' namespace-body '}'
///
/// namespace-alias-definition: [C++ 7.3.2: namespace.alias]
/// 'namespace' identifier '=' qualified-namespace-specifier ';'
///
Parser::DeclPtrTy Parser::ParseNamespace(unsigned Context,
SourceLocation &DeclEnd) {
assert(Tok.is(tok::kw_namespace) && "Not a namespace!");
SourceLocation NamespaceLoc = ConsumeToken(); // eat the 'namespace'.
if (Tok.is(tok::code_completion)) {
Actions.CodeCompleteNamespaceDecl(CurScope);
ConsumeToken();
}
SourceLocation IdentLoc;
IdentifierInfo *Ident = 0;
Token attrTok;
if (Tok.is(tok::identifier)) {
Ident = Tok.getIdentifierInfo();
IdentLoc = ConsumeToken(); // eat the identifier.
}
// Read label attributes, if present.
llvm::OwningPtr<AttributeList> AttrList;
if (Tok.is(tok::kw___attribute)) {
attrTok = Tok;
// FIXME: save these somewhere.
AttrList.reset(ParseGNUAttributes());
}
if (Tok.is(tok::equal)) {
if (AttrList)
Diag(attrTok, diag::err_unexpected_namespace_attributes_alias);
return ParseNamespaceAlias(NamespaceLoc, IdentLoc, Ident, DeclEnd);
}
if (Tok.isNot(tok::l_brace)) {
Diag(Tok, Ident ? diag::err_expected_lbrace :
diag::err_expected_ident_lbrace);
return DeclPtrTy();
}
SourceLocation LBrace = ConsumeBrace();
if (CurScope->isClassScope() || CurScope->isTemplateParamScope() ||
CurScope->isInObjcMethodScope() || CurScope->getBlockParent() ||
CurScope->getFnParent()) {
Diag(LBrace, diag::err_namespace_nonnamespace_scope);
SkipUntil(tok::r_brace, false);
return DeclPtrTy();
}
// Enter a scope for the namespace.
ParseScope NamespaceScope(this, Scope::DeclScope);
DeclPtrTy NamespcDecl =
Actions.ActOnStartNamespaceDef(CurScope, IdentLoc, Ident, LBrace,
AttrList.get());
PrettyStackTraceActionsDecl CrashInfo(NamespcDecl, NamespaceLoc, Actions,
PP.getSourceManager(),
"parsing namespace");
while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
CXX0XAttributeList Attr;
if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
Attr = ParseCXX0XAttributes();
ParseExternalDeclaration(Attr);
}
// Leave the namespace scope.
NamespaceScope.Exit();
2008-05-02 05:44:34 +08:00
SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBrace);
Actions.ActOnFinishNamespaceDef(NamespcDecl, RBraceLoc);
DeclEnd = RBraceLoc;
return NamespcDecl;
}
/// ParseNamespaceAlias - Parse the part after the '=' in a namespace
/// alias definition.
///
Parser::DeclPtrTy 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(CurScope);
ConsumeToken();
}
CXXScopeSpec SS;
// Parse (optional) nested-name-specifier.
ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
if (SS.isInvalid() || Tok.isNot(tok::identifier)) {
Diag(Tok, diag::err_expected_namespace_name);
// Skip to end of the definition and eat the ';'.
SkipUntil(tok::semi);
return DeclPtrTy();
}
// Parse identifier.
IdentifierInfo *Ident = Tok.getIdentifierInfo();
SourceLocation IdentLoc = ConsumeToken();
// Eat the ';'.
DeclEnd = Tok.getLocation();
ExpectAndConsume(tok::semi, diag::err_expected_semi_after_namespace_name,
"", tok::semi);
return Actions.ActOnNamespaceAliasDef(CurScope, 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
///
Parser::DeclPtrTy Parser::ParseLinkage(ParsingDeclSpec &DS,
unsigned Context) {
assert(Tok.is(tok::string_literal) && "Not a string literal!");
llvm::SmallString<8> LangBuffer;
// LangBuffer is guaranteed to be big enough.
bool Invalid = false;
llvm::StringRef Lang = PP.getSpelling(Tok, LangBuffer, &Invalid);
if (Invalid)
return DeclPtrTy();
SourceLocation Loc = ConsumeStringToken();
ParseScope LinkageScope(this, Scope::DeclScope);
DeclPtrTy LinkageSpec
= Actions.ActOnStartLinkageSpecification(CurScope,
/*FIXME: */SourceLocation(),
Loc, Lang,
Tok.is(tok::l_brace)? Tok.getLocation()
: SourceLocation());
CXX0XAttributeList Attr;
if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier()) {
Attr = ParseCXX0XAttributes();
}
if (Tok.isNot(tok::l_brace)) {
ParseDeclarationOrFunctionDefinition(DS, Attr.AttrList);
return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec,
SourceLocation());
}
DS.abort();
if (Attr.HasAttr)
Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
<< Attr.Range;
SourceLocation LBrace = ConsumeBrace();
while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
CXX0XAttributeList Attr;
if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
Attr = ParseCXX0XAttributes();
ParseExternalDeclaration(Attr);
}
SourceLocation RBrace = MatchRHSPunctuation(tok::r_brace, LBrace);
return Actions.ActOnFinishLinkageSpecification(CurScope, LinkageSpec, RBrace);
}
/// ParseUsingDirectiveOrDeclaration - Parse C++ using using-declaration or
/// using-directive. Assumes that current token is 'using'.
Parser::DeclPtrTy Parser::ParseUsingDirectiveOrDeclaration(unsigned Context,
SourceLocation &DeclEnd,
CXX0XAttributeList Attr) {
assert(Tok.is(tok::kw_using) && "Not using token");
// Eat 'using'.
SourceLocation UsingLoc = ConsumeToken();
if (Tok.is(tok::code_completion)) {
Actions.CodeCompleteUsing(CurScope);
ConsumeToken();
}
if (Tok.is(tok::kw_namespace))
// Next token after 'using' is 'namespace' so it must be using-directive
return ParseUsingDirective(Context, UsingLoc, DeclEnd, Attr.AttrList);
if (Attr.HasAttr)
Diag(Attr.Range.getBegin(), diag::err_attributes_not_allowed)
<< Attr.Range;
// Otherwise, it must be using-declaration.
// Ignore illegal attributes (the caller should already have issued an error.
return ParseUsingDeclaration(Context, UsingLoc, DeclEnd);
}
/// 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] ;
///
Parser::DeclPtrTy Parser::ParseUsingDirective(unsigned Context,
SourceLocation UsingLoc,
SourceLocation &DeclEnd,
AttributeList *Attr) {
assert(Tok.is(tok::kw_namespace) && "Not 'namespace' token");
// Eat 'namespace'.
SourceLocation NamespcLoc = ConsumeToken();
if (Tok.is(tok::code_completion)) {
Actions.CodeCompleteUsingDirective(CurScope);
ConsumeToken();
}
CXXScopeSpec SS;
// Parse (optional) nested-name-specifier.
ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
IdentifierInfo *NamespcName = 0;
SourceLocation IdentLoc = SourceLocation();
// Parse namespace-name.
if (SS.isInvalid() || 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 DeclPtrTy();
}
// 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;
Attr = addAttributeLists(Attr, ParseGNUAttributes());
}
// Eat ';'.
DeclEnd = Tok.getLocation();
ExpectAndConsume(tok::semi,
GNUAttr ? diag::err_expected_semi_after_attribute_list :
diag::err_expected_semi_after_namespace_name, "", tok::semi);
return Actions.ActOnUsingDirective(CurScope, UsingLoc, NamespcLoc, SS,
IdentLoc, NamespcName, Attr);
}
/// ParseUsingDeclaration - Parse C++ using-declaration. Assumes that
/// 'using' was already seen.
///
/// using-declaration: [C++ 7.3.p3: namespace.udecl]
/// 'using' 'typename'[opt] ::[opt] nested-name-specifier
/// unqualified-id
/// 'using' :: unqualified-id
///
Parser::DeclPtrTy Parser::ParseUsingDeclaration(unsigned Context,
SourceLocation UsingLoc,
SourceLocation &DeclEnd,
AccessSpecifier AS) {
CXXScopeSpec SS;
SourceLocation TypenameLoc;
bool IsTypeName;
// Ignore optional 'typename'.
// FIXME: This is wrong; we should parse this as a typename-specifier.
if (Tok.is(tok::kw_typename)) {
TypenameLoc = Tok.getLocation();
ConsumeToken();
IsTypeName = true;
}
else
IsTypeName = false;
// Parse nested-name-specifier.
ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
// Check nested-name specifier.
if (SS.isInvalid()) {
SkipUntil(tok::semi);
return DeclPtrTy();
}
// Parse the unqualified-id. We allow parsing of both constructor and
// destructor names and allow the action module to diagnose any semantic
// errors.
UnqualifiedId Name;
if (ParseUnqualifiedId(SS,
/*EnteringContext=*/false,
/*AllowDestructorName=*/true,
/*AllowConstructorName=*/true,
/*ObjectType=*/0,
Name)) {
SkipUntil(tok::semi);
return DeclPtrTy();
}
// Parse (optional) attributes (most likely GNU strong-using extension).
llvm::OwningPtr<AttributeList> AttrList;
if (Tok.is(tok::kw___attribute))
AttrList.reset(ParseGNUAttributes());
// Eat ';'.
DeclEnd = Tok.getLocation();
ExpectAndConsume(tok::semi, diag::err_expected_semi_after,
AttrList ? "attributes list" : "using declaration",
tok::semi);
return Actions.ActOnUsingDeclaration(CurScope, AS, true, UsingLoc, SS, Name,
AttrList.get(), IsTypeName, TypenameLoc);
}
/// ParseStaticAssertDeclaration - Parse C++0x static_assert-declaratoion.
///
/// static_assert-declaration:
/// static_assert ( constant-expression , string-literal ) ;
///
Parser::DeclPtrTy Parser::ParseStaticAssertDeclaration(SourceLocation &DeclEnd){
assert(Tok.is(tok::kw_static_assert) && "Not a static_assert declaration");
SourceLocation StaticAssertLoc = ConsumeToken();
if (Tok.isNot(tok::l_paren)) {
Diag(Tok, diag::err_expected_lparen);
return DeclPtrTy();
}
SourceLocation LParenLoc = ConsumeParen();
OwningExprResult AssertExpr(ParseConstantExpression());
if (AssertExpr.isInvalid()) {
SkipUntil(tok::semi);
return DeclPtrTy();
}
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "", tok::semi))
return DeclPtrTy();
if (Tok.isNot(tok::string_literal)) {
Diag(Tok, diag::err_expected_string_literal);
SkipUntil(tok::semi);
return DeclPtrTy();
}
OwningExprResult AssertMessage(ParseStringLiteralExpression());
if (AssertMessage.isInvalid())
return DeclPtrTy();
MatchRHSPunctuation(tok::r_paren, LParenLoc);
DeclEnd = Tok.getLocation();
ExpectAndConsume(tok::semi, diag::err_expected_semi_after_static_assert);
return Actions.ActOnStaticAssertDeclaration(StaticAssertLoc, move(AssertExpr),
move(AssertMessage));
}
/// ParseDecltypeSpecifier - Parse a C++0x decltype specifier.
///
/// 'decltype' ( expression )
///
void Parser::ParseDecltypeSpecifier(DeclSpec &DS) {
assert(Tok.is(tok::kw_decltype) && "Not a decltype specifier");
SourceLocation StartLoc = ConsumeToken();
SourceLocation LParenLoc = Tok.getLocation();
if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
"decltype")) {
SkipUntil(tok::r_paren);
return;
}
// Parse the expression
// C++0x [dcl.type.simple]p4:
// The operand of the decltype specifier is an unevaluated operand.
EnterExpressionEvaluationContext Unevaluated(Actions,
Action::Unevaluated);
OwningExprResult Result = ParseExpression();
if (Result.isInvalid()) {
SkipUntil(tok::r_paren);
return;
}
// Match the ')'
SourceLocation RParenLoc;
if (Tok.is(tok::r_paren))
RParenLoc = ConsumeParen();
else
MatchRHSPunctuation(tok::r_paren, LParenLoc);
if (RParenLoc.isInvalid())
return;
const char *PrevSpec = 0;
unsigned DiagID;
// Check for duplicate type specifiers (e.g. "int decltype(a)").
if (DS.SetTypeSpecType(DeclSpec::TST_decltype, StartLoc, PrevSpec,
DiagID, Result.release()))
Diag(StartLoc, DiagID) << PrevSpec;
}
/// ParseClassName - Parse a C++ class-name, which names a class. Note
/// that we only check that the result names a type; semantic analysis
/// will need to verify that the type names a class. The result is
/// either a type or NULL, depending on whether a type name was
/// found.
///
/// class-name: [C++ 9.1]
/// identifier
/// simple-template-id
///
Parser::TypeResult Parser::ParseClassName(SourceLocation &EndLocation,
CXXScopeSpec *SS) {
// Check whether we have a template-id that names a type.
if (Tok.is(tok::annot_template_id)) {
TemplateIdAnnotation *TemplateId
= static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
if (TemplateId->Kind == TNK_Type_template ||
TemplateId->Kind == TNK_Dependent_template_name) {
AnnotateTemplateIdTokenAsType(SS);
assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
TypeTy *Type = Tok.getAnnotationValue();
EndLocation = Tok.getAnnotationEndLoc();
ConsumeToken();
if (Type)
return Type;
return true;
}
// Fall through to produce an error below.
}
if (Tok.isNot(tok::identifier)) {
Diag(Tok, diag::err_expected_class_name);
return true;
}
IdentifierInfo *Id = Tok.getIdentifierInfo();
SourceLocation IdLoc = ConsumeToken();
if (Tok.is(tok::less)) {
// It looks the user intended to write a template-id here, but the
// template-name was wrong. Try to fix that.
TemplateNameKind TNK = TNK_Type_template;
TemplateTy Template;
if (!Actions.DiagnoseUnknownTemplateName(*Id, IdLoc, CurScope,
SS, Template, TNK)) {
Diag(IdLoc, diag::err_unknown_template_name)
<< Id;
}
if (!Template)
return true;
// Form the template name
UnqualifiedId TemplateName;
TemplateName.setIdentifier(Id, IdLoc);
// Parse the full template-id, then turn it into a type.
if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateName,
SourceLocation(), true))
return true;
if (TNK == TNK_Dependent_template_name)
AnnotateTemplateIdTokenAsType(SS);
// If we didn't end up with a typename token, there's nothing more we
// can do.
if (Tok.isNot(tok::annot_typename))
return true;
// Retrieve the type from the annotation token, consume that token, and
// return.
EndLocation = Tok.getAnnotationEndLoc();
TypeTy *Type = Tok.getAnnotationValue();
ConsumeToken();
return Type;
}
// We have an identifier; check whether it is actually a type.
TypeTy *Type = Actions.getTypeName(*Id, IdLoc, CurScope, SS, true);
if (!Type) {
Diag(IdLoc, diag::err_expected_class_name);
return true;
}
// Consume the identifier.
EndLocation = IdLoc;
return Type;
}
/// ParseClassSpecifier - Parse a C++ class-specifier [C++ class] or
/// elaborated-type-specifier [C++ dcl.type.elab]; we can't tell which
/// until we reach the start of a definition or see a token that
/// cannot start a definition. If SuppressDeclarations is true, we do know.
///
/// class-specifier: [C++ class]
/// class-head '{' member-specification[opt] '}'
/// class-head '{' member-specification[opt] '}' attributes[opt]
/// class-head:
/// class-key identifier[opt] base-clause[opt]
/// class-key nested-name-specifier identifier base-clause[opt]
/// class-key nested-name-specifier[opt] simple-template-id
/// base-clause[opt]
/// [GNU] class-key attributes[opt] identifier[opt] base-clause[opt]
/// [GNU] class-key attributes[opt] nested-name-specifier
/// identifier base-clause[opt]
/// [GNU] class-key attributes[opt] nested-name-specifier[opt]
/// simple-template-id base-clause[opt]
/// class-key:
/// 'class'
/// 'struct'
/// 'union'
///
/// elaborated-type-specifier: [C++ dcl.type.elab]
/// class-key ::[opt] nested-name-specifier[opt] identifier
/// class-key ::[opt] nested-name-specifier[opt] 'template'[opt]
/// simple-template-id
///
/// Note that the C++ class-specifier and elaborated-type-specifier,
/// together, subsume the C99 struct-or-union-specifier:
///
/// struct-or-union-specifier: [C99 6.7.2.1]
/// struct-or-union identifier[opt] '{' struct-contents '}'
/// struct-or-union identifier
/// [GNU] struct-or-union attributes[opt] identifier[opt] '{' struct-contents
/// '}' attributes[opt]
/// [GNU] struct-or-union attributes[opt] identifier
/// struct-or-union:
/// 'struct'
/// 'union'
void Parser::ParseClassSpecifier(tok::TokenKind TagTokKind,
SourceLocation StartLoc, DeclSpec &DS,
const ParsedTemplateInfo &TemplateInfo,
AccessSpecifier AS, bool SuppressDeclarations){
DeclSpec::TST TagType;
if (TagTokKind == tok::kw_struct)
TagType = DeclSpec::TST_struct;
else if (TagTokKind == tok::kw_class)
TagType = DeclSpec::TST_class;
else {
assert(TagTokKind == tok::kw_union && "Not a class specifier");
TagType = DeclSpec::TST_union;
}
if (Tok.is(tok::code_completion)) {
// Code completion for a struct, class, or union name.
Actions.CodeCompleteTag(CurScope, TagType);
ConsumeToken();
}
AttributeList *AttrList = 0;
// If attributes exist after tag, parse them.
if (Tok.is(tok::kw___attribute))
AttrList = ParseGNUAttributes();
// If declspecs exist after tag, parse them.
if (Tok.is(tok::kw___declspec))
AttrList = ParseMicrosoftDeclSpec(AttrList);
// If C++0x attributes exist here, parse them.
// FIXME: Are we consistent with the ordering of parsing of different
// styles of attributes?
if (isCXX0XAttributeSpecifier())
AttrList = addAttributeLists(AttrList, ParseCXX0XAttributes().AttrList);
if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_pod)) {
// GNU libstdc++ 4.2 uses __is_pod as the name of a struct template, but
// __is_pod is a keyword in GCC >= 4.3. Therefore, when we see the
// token sequence "struct __is_pod", make __is_pod into a normal
// identifier rather than a keyword, to allow libstdc++ 4.2 to work
// properly.
Tok.getIdentifierInfo()->setTokenID(tok::identifier);
Tok.setKind(tok::identifier);
}
if (TagType == DeclSpec::TST_struct && Tok.is(tok::kw___is_empty)) {
// GNU libstdc++ 4.2 uses __is_empty as the name of a struct template, but
// __is_empty is a keyword in GCC >= 4.3. Therefore, when we see the
// token sequence "struct __is_empty", make __is_empty into a normal
// identifier rather than a keyword, to allow libstdc++ 4.2 to work
// properly.
Tok.getIdentifierInfo()->setTokenID(tok::identifier);
Tok.setKind(tok::identifier);
}
// Parse the (optional) nested-name-specifier.
CXXScopeSpec &SS = DS.getTypeSpecScope();
if (getLang().CPlusPlus) {
// "FOO : BAR" is not a potential typo for "FOO::BAR".
ColonProtectionRAIIObject X(*this);
ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, true);
if (SS.isSet())
if (Tok.isNot(tok::identifier) && Tok.isNot(tok::annot_template_id))
Diag(Tok, diag::err_expected_ident);
}
TemplateParameterLists *TemplateParams = TemplateInfo.TemplateParams;
// Parse the (optional) class name or simple-template-id.
IdentifierInfo *Name = 0;
SourceLocation NameLoc;
TemplateIdAnnotation *TemplateId = 0;
if (Tok.is(tok::identifier)) {
Name = Tok.getIdentifierInfo();
NameLoc = ConsumeToken();
if (Tok.is(tok::less)) {
// The name was supposed to refer to a template, but didn't.
// Eat the template argument list and try to continue parsing this as
// a class (or template thereof).
TemplateArgList TemplateArgs;
SourceLocation LAngleLoc, RAngleLoc;
if (ParseTemplateIdAfterTemplateName(TemplateTy(), NameLoc, &SS,
true, LAngleLoc,
TemplateArgs, RAngleLoc)) {
// We couldn't parse the template argument list at all, so don't
// try to give any location information for the list.
LAngleLoc = RAngleLoc = SourceLocation();
}
Diag(NameLoc, diag::err_explicit_spec_non_template)
<< (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation)
<< (TagType == DeclSpec::TST_class? 0
: TagType == DeclSpec::TST_struct? 1
: 2)
<< Name
<< SourceRange(LAngleLoc, RAngleLoc);
// Strip off the last template parameter list if it was empty, since
// we've removed its template argument list.
if (TemplateParams && TemplateInfo.LastParameterListWasEmpty) {
if (TemplateParams && TemplateParams->size() > 1) {
TemplateParams->pop_back();
} else {
TemplateParams = 0;
const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
= ParsedTemplateInfo::NonTemplate;
}
} else if (TemplateInfo.Kind
== ParsedTemplateInfo::ExplicitInstantiation) {
// Pretend this is just a forward declaration.
TemplateParams = 0;
const_cast<ParsedTemplateInfo&>(TemplateInfo).Kind
= ParsedTemplateInfo::NonTemplate;
const_cast<ParsedTemplateInfo&>(TemplateInfo).TemplateLoc
= SourceLocation();
const_cast<ParsedTemplateInfo&>(TemplateInfo).ExternLoc
= SourceLocation();
}
}
} else if (Tok.is(tok::annot_template_id)) {
TemplateId = static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
NameLoc = ConsumeToken();
if (TemplateId->Kind != TNK_Type_template) {
// The template-name in the simple-template-id refers to
// something other than a class template. Give an appropriate
// error message and skip to the ';'.
SourceRange Range(NameLoc);
if (SS.isNotEmpty())
Range.setBegin(SS.getBeginLoc());
Diag(TemplateId->LAngleLoc, diag::err_template_spec_syntax_non_template)
<< Name << static_cast<int>(TemplateId->Kind) << Range;
DS.SetTypeSpecError();
SkipUntil(tok::semi, false, true);
TemplateId->Destroy();
return;
}
}
// There are four options here. If we have 'struct foo;', then this
// is either a forward declaration or a friend declaration, which
// have to be treated differently. If we have 'struct foo {...' or
// 'struct foo :...' then this is a definition. Otherwise we have
// something like 'struct foo xyz', a reference.
// However, in some contexts, things look like declarations but are just
// references, e.g.
// new struct s;
// or
// &T::operator struct s;
// For these, SuppressDeclarations is true.
Action::TagUseKind TUK;
if (SuppressDeclarations)
TUK = Action::TUK_Reference;
else if (Tok.is(tok::l_brace) || (getLang().CPlusPlus && Tok.is(tok::colon))){
if (DS.isFriendSpecified()) {
// C++ [class.friend]p2:
// A class shall not be defined in a friend declaration.
Diag(Tok.getLocation(), diag::err_friend_decl_defines_class)
<< SourceRange(DS.getFriendSpecLoc());
// Skip everything up to the semicolon, so that this looks like a proper
// friend class (or template thereof) declaration.
SkipUntil(tok::semi, true, true);
TUK = Action::TUK_Friend;
} else {
// Okay, this is a class definition.
TUK = Action::TUK_Definition;
}
} else if (Tok.is(tok::semi))
TUK = DS.isFriendSpecified() ? Action::TUK_Friend : Action::TUK_Declaration;
else
TUK = Action::TUK_Reference;
if (!Name && !TemplateId && TUK != Action::TUK_Definition) {
// We have a declaration or reference to an anonymous class.
Diag(StartLoc, diag::err_anon_type_definition)
<< DeclSpec::getSpecifierName(TagType);
SkipUntil(tok::comma, true);
if (TemplateId)
TemplateId->Destroy();
return;
}
// Create the tag portion of the class or class template.
Action::DeclResult TagOrTempResult = true; // invalid
Action::TypeResult TypeResult = true; // invalid
bool Owned = false;
if (TemplateId) {
// Explicit specialization, class template partial specialization,
// or explicit instantiation.
ASTTemplateArgsPtr TemplateArgsPtr(Actions,
TemplateId->getTemplateArgs(),
TemplateId->NumArgs);
if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
TUK == Action::TUK_Declaration) {
// This is an explicit instantiation of a class template.
TagOrTempResult
= Actions.ActOnExplicitInstantiation(CurScope,
TemplateInfo.ExternLoc,
TemplateInfo.TemplateLoc,
TagType,
StartLoc,
SS,
TemplateTy::make(TemplateId->Template),
TemplateId->TemplateNameLoc,
TemplateId->LAngleLoc,
TemplateArgsPtr,
TemplateId->RAngleLoc,
AttrList);
// Friend template-ids are treated as references unless
// they have template headers, in which case they're ill-formed
// (FIXME: "template <class T> friend class A<T>::B<int>;").
// We diagnose this error in ActOnClassTemplateSpecialization.
} else if (TUK == Action::TUK_Reference ||
(TUK == Action::TUK_Friend &&
TemplateInfo.Kind == ParsedTemplateInfo::NonTemplate)) {
TypeResult
= Actions.ActOnTemplateIdType(TemplateTy::make(TemplateId->Template),
TemplateId->TemplateNameLoc,
TemplateId->LAngleLoc,
TemplateArgsPtr,
TemplateId->RAngleLoc);
TypeResult = Actions.ActOnTagTemplateIdType(TypeResult, TUK,
TagType, StartLoc);
} else {
// This is an explicit specialization or a class template
// partial specialization.
TemplateParameterLists FakedParamLists;
if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
// This looks like an explicit instantiation, because we have
// something like
//
// template class Foo<X>
//
// but it actually has a definition. Most likely, this was
// meant to be an explicit specialization, but the user forgot
// the '<>' after 'template'.
assert(TUK == Action::TUK_Definition && "Expected a definition here");
SourceLocation LAngleLoc
= PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
Diag(TemplateId->TemplateNameLoc,
diag::err_explicit_instantiation_with_definition)
<< SourceRange(TemplateInfo.TemplateLoc)
<< FixItHint::CreateInsertion(LAngleLoc, "<>");
// Create a fake template parameter list that contains only
// "template<>", so that we treat this construct as a class
// template specialization.
FakedParamLists.push_back(
Actions.ActOnTemplateParameterList(0, SourceLocation(),
TemplateInfo.TemplateLoc,
LAngleLoc,
0, 0,
LAngleLoc));
TemplateParams = &FakedParamLists;
}
// Build the class template specialization.
TagOrTempResult
= Actions.ActOnClassTemplateSpecialization(CurScope, TagType, TUK,
StartLoc, SS,
TemplateTy::make(TemplateId->Template),
TemplateId->TemplateNameLoc,
TemplateId->LAngleLoc,
TemplateArgsPtr,
TemplateId->RAngleLoc,
AttrList,
Action::MultiTemplateParamsArg(Actions,
TemplateParams? &(*TemplateParams)[0] : 0,
TemplateParams? TemplateParams->size() : 0));
}
TemplateId->Destroy();
} else if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
TUK == Action::TUK_Declaration) {
// Explicit instantiation of a member of a class template
// specialization, e.g.,
//
// template struct Outer<int>::Inner;
//
TagOrTempResult
= Actions.ActOnExplicitInstantiation(CurScope,
TemplateInfo.ExternLoc,
TemplateInfo.TemplateLoc,
TagType, StartLoc, SS, Name,
NameLoc, AttrList);
} else {
if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation &&
TUK == Action::TUK_Definition) {
// FIXME: Diagnose this particular error.
}
bool IsDependent = false;
// Declaration or definition of a class type
TagOrTempResult = Actions.ActOnTag(CurScope, TagType, TUK, StartLoc, SS,
Name, NameLoc, AttrList, AS,
Action::MultiTemplateParamsArg(Actions,
TemplateParams? &(*TemplateParams)[0] : 0,
TemplateParams? TemplateParams->size() : 0),
Owned, IsDependent);
// If ActOnTag said the type was dependent, try again with the
// less common call.
if (IsDependent)
TypeResult = Actions.ActOnDependentTag(CurScope, TagType, TUK,
SS, Name, StartLoc, NameLoc);
}
// If there is a body, parse it and inform the actions module.
if (TUK == Action::TUK_Definition) {
assert(Tok.is(tok::l_brace) ||
(getLang().CPlusPlus && Tok.is(tok::colon)));
if (getLang().CPlusPlus)
ParseCXXMemberSpecification(StartLoc, TagType, TagOrTempResult.get());
else
ParseStructUnionBody(StartLoc, TagType, TagOrTempResult.get());
}
void *Result;
if (!TypeResult.isInvalid()) {
TagType = DeclSpec::TST_typename;
Result = TypeResult.get();
Owned = false;
} else if (!TagOrTempResult.isInvalid()) {
Result = TagOrTempResult.get().getAs<void>();
} else {
DS.SetTypeSpecError();
return;
}
const char *PrevSpec = 0;
unsigned DiagID;
// FIXME: The DeclSpec should keep the locations of both the keyword and the
// name (if there is one).
SourceLocation TSTLoc = NameLoc.isValid()? NameLoc : StartLoc;
if (DS.SetTypeSpecType(TagType, TSTLoc, PrevSpec, DiagID,
Result, Owned))
Diag(StartLoc, DiagID) << PrevSpec;
// At this point, we've successfully parsed a class-specifier in 'definition'
// form (e.g. "struct foo { int x; }". While we could just return here, we're
// going to look at what comes after it to improve error recovery. If an
// impossible token occurs next, we assume that the programmer forgot a ; at
// the end of the declaration and recover that way.
//
// This switch enumerates the valid "follow" set for definition.
if (TUK == Action::TUK_Definition) {
bool ExpectedSemi = true;
switch (Tok.getKind()) {
default: break;
case tok::semi: // struct foo {...} ;
case tok::star: // struct foo {...} * P;
case tok::amp: // struct foo {...} & R = ...
case tok::identifier: // struct foo {...} V ;
case tok::r_paren: //(struct foo {...} ) {4}
case tok::annot_cxxscope: // struct foo {...} a:: b;
case tok::annot_typename: // struct foo {...} a ::b;
case tok::annot_template_id: // struct foo {...} a<int> ::b;
case tok::l_paren: // struct foo {...} ( x);
2010-02-03 09:45:03 +08:00
case tok::comma: // __builtin_offsetof(struct foo{...} ,
ExpectedSemi = false;
break;
// Type qualifiers
case tok::kw_const: // struct foo {...} const x;
case tok::kw_volatile: // struct foo {...} volatile x;
case tok::kw_restrict: // struct foo {...} restrict x;
case tok::kw_inline: // struct foo {...} inline foo() {};
// Storage-class specifiers
case tok::kw_static: // struct foo {...} static x;
case tok::kw_extern: // struct foo {...} extern x;
case tok::kw_typedef: // struct foo {...} typedef x;
case tok::kw_register: // struct foo {...} register x;
case tok::kw_auto: // struct foo {...} auto x;
case tok::kw_mutable: // struct foo {...} mutable x;
// As shown above, type qualifiers and storage class specifiers absolutely
// can occur after class specifiers according to the grammar. However,
// almost noone actually writes code like this. If we see one of these,
// it is much more likely that someone missed a semi colon and the
// type/storage class specifier we're seeing is part of the *next*
// intended declaration, as in:
//
// struct foo { ... }
// typedef int X;
//
// We'd really like to emit a missing semicolon error instead of emitting
// an error on the 'int' saying that you can't have two type specifiers in
// the same declaration of X. Because of this, we look ahead past this
// token to see if it's a type specifier. If so, we know the code is
// otherwise invalid, so we can produce the expected semi error.
if (!isKnownToBeTypeSpecifier(NextToken()))
ExpectedSemi = false;
break;
case tok::r_brace: // struct bar { struct foo {...} }
// Missing ';' at end of struct is accepted as an extension in C mode.
if (!getLang().CPlusPlus)
ExpectedSemi = false;
break;
}
if (ExpectedSemi) {
ExpectAndConsume(tok::semi, diag::err_expected_semi_after_tagdecl,
TagType == DeclSpec::TST_class ? "class"
: TagType == DeclSpec::TST_struct? "struct" : "union");
// Push this token back into the preprocessor and change our current token
// to ';' so that the rest of the code recovers as though there were an
// ';' after the definition.
PP.EnterToken(Tok);
Tok.setKind(tok::semi);
}
}
}
/// ParseBaseClause - Parse the base-clause of a C++ class [C++ class.derived].
///
/// base-clause : [C++ class.derived]
/// ':' base-specifier-list
/// base-specifier-list:
/// base-specifier '...'[opt]
/// base-specifier-list ',' base-specifier '...'[opt]
void Parser::ParseBaseClause(DeclPtrTy ClassDecl) {
assert(Tok.is(tok::colon) && "Not a base clause");
ConsumeToken();
// Build up an array of parsed base specifiers.
llvm::SmallVector<BaseTy *, 8> BaseInfo;
while (true) {
// Parse a base-specifier.
BaseResult Result = ParseBaseSpecifier(ClassDecl);
if (Result.isInvalid()) {
// Skip the rest of this base specifier, up until the comma or
// opening brace.
SkipUntil(tok::comma, tok::l_brace, true, true);
} else {
// Add this to our array of base specifiers.
BaseInfo.push_back(Result.get());
}
// If the next token is a comma, consume it and keep reading
// base-specifiers.
if (Tok.isNot(tok::comma)) break;
// Consume the comma.
ConsumeToken();
}
// Attach the base specifiers
Actions.ActOnBaseSpecifiers(ClassDecl, BaseInfo.data(), BaseInfo.size());
}
/// ParseBaseSpecifier - Parse a C++ base-specifier. A base-specifier is
/// one entry in the base class list of a class specifier, for example:
/// class foo : public bar, virtual private baz {
/// 'public bar' and 'virtual private baz' are each base-specifiers.
///
/// base-specifier: [C++ class.derived]
/// ::[opt] nested-name-specifier[opt] class-name
/// 'virtual' access-specifier[opt] ::[opt] nested-name-specifier[opt]
/// class-name
/// access-specifier 'virtual'[opt] ::[opt] nested-name-specifier[opt]
/// class-name
Parser::BaseResult Parser::ParseBaseSpecifier(DeclPtrTy ClassDecl) {
bool IsVirtual = false;
SourceLocation StartLoc = Tok.getLocation();
// Parse the 'virtual' keyword.
if (Tok.is(tok::kw_virtual)) {
ConsumeToken();
IsVirtual = true;
}
// Parse an (optional) access specifier.
AccessSpecifier Access = getAccessSpecifierIfPresent();
if (Access != AS_none)
ConsumeToken();
// Parse the 'virtual' keyword (again!), in case it came after the
// access specifier.
if (Tok.is(tok::kw_virtual)) {
SourceLocation VirtualLoc = ConsumeToken();
if (IsVirtual) {
// Complain about duplicate 'virtual'
Diag(VirtualLoc, diag::err_dup_virtual)
<< FixItHint::CreateRemoval(VirtualLoc);
}
IsVirtual = true;
}
// Parse optional '::' and optional nested-name-specifier.
CXXScopeSpec SS;
ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0,
2010-03-02 08:25:00 +08:00
/*EnteringContext=*/false);
// The location of the base class itself.
SourceLocation BaseLoc = Tok.getLocation();
// Parse the class-name.
SourceLocation EndLocation;
TypeResult BaseType = ParseClassName(EndLocation, &SS);
if (BaseType.isInvalid())
return true;
// Find the complete source range for the base-specifier.
SourceRange Range(StartLoc, EndLocation);
// Notify semantic analysis that we have parsed a complete
// base-specifier.
return Actions.ActOnBaseSpecifier(ClassDecl, Range, IsVirtual, Access,
BaseType.get(), BaseLoc);
}
/// getAccessSpecifierIfPresent - Determine whether the next token is
/// a C++ access-specifier.
///
/// access-specifier: [C++ class.derived]
/// 'private'
/// 'protected'
/// 'public'
AccessSpecifier Parser::getAccessSpecifierIfPresent() const {
switch (Tok.getKind()) {
default: return AS_none;
case tok::kw_private: return AS_private;
case tok::kw_protected: return AS_protected;
case tok::kw_public: return AS_public;
}
}
void Parser::HandleMemberFunctionDefaultArgs(Declarator& DeclaratorInfo,
DeclPtrTy ThisDecl) {
// We just declared a member function. If this member function
// has any default arguments, we'll need to parse them later.
LateParsedMethodDeclaration *LateMethod = 0;
DeclaratorChunk::FunctionTypeInfo &FTI
= DeclaratorInfo.getTypeObject(0).Fun;
for (unsigned ParamIdx = 0; ParamIdx < FTI.NumArgs; ++ParamIdx) {
if (LateMethod || FTI.ArgInfo[ParamIdx].DefaultArgTokens) {
if (!LateMethod) {
// Push this method onto the stack of late-parsed method
// declarations.
getCurrentClass().MethodDecls.push_back(
LateParsedMethodDeclaration(ThisDecl));
LateMethod = &getCurrentClass().MethodDecls.back();
LateMethod->TemplateScope = CurScope->isTemplateParamScope();
// Add all of the parameters prior to this one (they don't
// have default arguments).
LateMethod->DefaultArgs.reserve(FTI.NumArgs);
for (unsigned I = 0; I < ParamIdx; ++I)
LateMethod->DefaultArgs.push_back(
LateParsedDefaultArgument(FTI.ArgInfo[I].Param));
}
// Add this parameter to the list of parameters (it or may
// not have a default argument).
LateMethod->DefaultArgs.push_back(
LateParsedDefaultArgument(FTI.ArgInfo[ParamIdx].Param,
FTI.ArgInfo[ParamIdx].DefaultArgTokens));
}
}
}
/// ParseCXXClassMemberDeclaration - Parse a C++ class member declaration.
///
/// member-declaration:
/// decl-specifier-seq[opt] member-declarator-list[opt] ';'
/// function-definition ';'[opt]
/// ::[opt] nested-name-specifier template[opt] unqualified-id ';'[TODO]
/// using-declaration [TODO]
/// [C++0x] static_assert-declaration
/// template-declaration
/// [GNU] '__extension__' member-declaration
///
/// member-declarator-list:
/// member-declarator
/// member-declarator-list ',' member-declarator
///
/// member-declarator:
/// declarator pure-specifier[opt]
/// declarator constant-initializer[opt]
/// identifier[opt] ':' constant-expression
///
/// pure-specifier:
/// '= 0'
///
/// constant-initializer:
/// '=' constant-expression
///
void Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
const ParsedTemplateInfo &TemplateInfo) {
// Access declarations.
if (!TemplateInfo.Kind &&
(Tok.is(tok::identifier) || Tok.is(tok::coloncolon)) &&
!TryAnnotateCXXScopeToken() &&
Tok.is(tok::annot_cxxscope)) {
bool isAccessDecl = false;
if (NextToken().is(tok::identifier))
isAccessDecl = GetLookAheadToken(2).is(tok::semi);
else
isAccessDecl = NextToken().is(tok::kw_operator);
if (isAccessDecl) {
// Collect the scope specifier token we annotated earlier.
CXXScopeSpec SS;
ParseOptionalCXXScopeSpecifier(SS, /*ObjectType*/ 0, false);
// Try to parse an unqualified-id.
UnqualifiedId Name;
if (ParseUnqualifiedId(SS, false, true, true, /*ObjectType*/ 0, Name)) {
SkipUntil(tok::semi);
return;
}
// TODO: recover from mistakenly-qualified operator declarations.
if (ExpectAndConsume(tok::semi,
diag::err_expected_semi_after,
"access declaration",
tok::semi))
return;
Actions.ActOnUsingDeclaration(CurScope, AS,
false, SourceLocation(),
SS, Name,
/* AttrList */ 0,
/* IsTypeName */ false,
SourceLocation());
return;
}
}
// static_assert-declaration
if (Tok.is(tok::kw_static_assert)) {
// FIXME: Check for templates
SourceLocation DeclEnd;
ParseStaticAssertDeclaration(DeclEnd);
return;
}
if (Tok.is(tok::kw_template)) {
assert(!TemplateInfo.TemplateParams &&
"Nested template improperly parsed?");
SourceLocation DeclEnd;
ParseDeclarationStartingWithTemplate(Declarator::MemberContext, DeclEnd,
AS);
return;
}
// Handle: member-declaration ::= '__extension__' member-declaration
if (Tok.is(tok::kw___extension__)) {
// __extension__ silences extension warnings in the subexpression.
ExtensionRAIIObject O(Diags); // Use RAII to do this.
ConsumeToken();
return ParseCXXClassMemberDeclaration(AS, TemplateInfo);
}
// Don't parse FOO:BAR as if it were a typo for FOO::BAR, in this context it
// is a bitfield.
ColonProtectionRAIIObject X(*this);
CXX0XAttributeList AttrList;
// Optional C++0x attribute-specifier
if (getLang().CPlusPlus0x && isCXX0XAttributeSpecifier())
AttrList = ParseCXX0XAttributes();
if (Tok.is(tok::kw_using)) {
// FIXME: Check for template aliases
if (AttrList.HasAttr)
Diag(AttrList.Range.getBegin(), diag::err_attributes_not_allowed)
<< AttrList.Range;
// Eat 'using'.
SourceLocation UsingLoc = ConsumeToken();
if (Tok.is(tok::kw_namespace)) {
Diag(UsingLoc, diag::err_using_namespace_in_class);
SkipUntil(tok::semi, true, true);
} else {
SourceLocation DeclEnd;
// Otherwise, it must be using-declaration.
ParseUsingDeclaration(Declarator::MemberContext, UsingLoc, DeclEnd, AS);
}
return;
}
SourceLocation DSStart = Tok.getLocation();
// decl-specifier-seq:
// Parse the common declaration-specifiers piece.
ParsingDeclSpec DS(*this);
DS.AddAttributes(AttrList.AttrList);
ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC_class);
Action::MultiTemplateParamsArg TemplateParams(Actions,
TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->data() : 0,
TemplateInfo.TemplateParams? TemplateInfo.TemplateParams->size() : 0);
if (Tok.is(tok::semi)) {
ConsumeToken();
Actions.ParsedFreeStandingDeclSpec(CurScope, DS);
return;
}
ParsingDeclarator DeclaratorInfo(*this, DS, Declarator::MemberContext);
if (Tok.isNot(tok::colon)) {
// Don't parse FOO:BAR as if it were a typo for FOO::BAR.
ColonProtectionRAIIObject X(*this);
// Parse the first declarator.
ParseDeclarator(DeclaratorInfo);
// Error parsing the declarator?
if (!DeclaratorInfo.hasName()) {
// If so, skip until the semi-colon or a }.
SkipUntil(tok::r_brace, true);
if (Tok.is(tok::semi))
ConsumeToken();
return;
}
// If attributes exist after the declarator, but before an '{', parse them.
if (Tok.is(tok::kw___attribute)) {
SourceLocation Loc;
AttributeList *AttrList = ParseGNUAttributes(&Loc);
DeclaratorInfo.AddAttributes(AttrList, Loc);
}
// function-definition:
if (Tok.is(tok::l_brace)
|| (DeclaratorInfo.isFunctionDeclarator() &&
(Tok.is(tok::colon) || Tok.is(tok::kw_try)))) {
if (!DeclaratorInfo.isFunctionDeclarator()) {
Diag(Tok, diag::err_func_def_no_params);
ConsumeBrace();
SkipUntil(tok::r_brace, true);
return;
}
if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
Diag(Tok, diag::err_function_declared_typedef);
// This recovery skips the entire function body. It would be nice
// to simply call ParseCXXInlineMethodDef() below, however Sema
// assumes the declarator represents a function, not a typedef.
ConsumeBrace();
SkipUntil(tok::r_brace, true);
return;
}
ParseCXXInlineMethodDef(AS, DeclaratorInfo, TemplateInfo);
return;
}
}
// member-declarator-list:
// member-declarator
// member-declarator-list ',' member-declarator
llvm::SmallVector<DeclPtrTy, 8> DeclsInGroup;
OwningExprResult BitfieldSize(Actions);
OwningExprResult Init(Actions);
bool Deleted = false;
while (1) {
// member-declarator:
// declarator pure-specifier[opt]
// declarator constant-initializer[opt]
// identifier[opt] ':' constant-expression
if (Tok.is(tok::colon)) {
ConsumeToken();
BitfieldSize = ParseConstantExpression();
if (BitfieldSize.isInvalid())
SkipUntil(tok::comma, true, true);
}
// pure-specifier:
// '= 0'
//
// constant-initializer:
// '=' constant-expression
//
// defaulted/deleted function-definition:
// '=' 'default' [TODO]
// '=' 'delete'
if (Tok.is(tok::equal)) {
ConsumeToken();
if (getLang().CPlusPlus0x && Tok.is(tok::kw_delete)) {
ConsumeToken();
Deleted = true;
} else {
Init = ParseInitializer();
if (Init.isInvalid())
SkipUntil(tok::comma, true, true);
}
}
// If attributes exist after the declarator, parse them.
if (Tok.is(tok::kw___attribute)) {
SourceLocation Loc;
AttributeList *AttrList = ParseGNUAttributes(&Loc);
DeclaratorInfo.AddAttributes(AttrList, Loc);
}
// NOTE: If Sema is the Action module and declarator is an instance field,
// this call will *not* return the created decl; It will return null.
// See Sema::ActOnCXXMemberDeclarator for details.
DeclPtrTy ThisDecl;
if (DS.isFriendSpecified()) {
// TODO: handle initializers, bitfields, 'delete'
ThisDecl = Actions.ActOnFriendFunctionDecl(CurScope, DeclaratorInfo,
/*IsDefinition*/ false,
move(TemplateParams));
} else {
ThisDecl = Actions.ActOnCXXMemberDeclarator(CurScope, AS,
DeclaratorInfo,
move(TemplateParams),
BitfieldSize.release(),
Init.release(),
/*IsDefinition*/Deleted,
Deleted);
}
if (ThisDecl)
DeclsInGroup.push_back(ThisDecl);
if (DeclaratorInfo.isFunctionDeclarator() &&
DeclaratorInfo.getDeclSpec().getStorageClassSpec()
!= DeclSpec::SCS_typedef) {
HandleMemberFunctionDefaultArgs(DeclaratorInfo, ThisDecl);
}
DeclaratorInfo.complete(ThisDecl);
// If we don't have a comma, it is either the end of the list (a ';')
// or an error, bail out.
if (Tok.isNot(tok::comma))
break;
// Consume the comma.
ConsumeToken();
// Parse the next declarator.
DeclaratorInfo.clear();
BitfieldSize = 0;
Init = 0;
Deleted = false;
// Attributes are only allowed on the second declarator.
if (Tok.is(tok::kw___attribute)) {
SourceLocation Loc;
AttributeList *AttrList = ParseGNUAttributes(&Loc);
DeclaratorInfo.AddAttributes(AttrList, Loc);
}
if (Tok.isNot(tok::colon))
ParseDeclarator(DeclaratorInfo);
}
if (ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list)) {
// Skip to end of block or statement.
SkipUntil(tok::r_brace, true, true);
// If we stopped at a ';', eat it.
if (Tok.is(tok::semi)) ConsumeToken();
return;
}
Actions.FinalizeDeclaratorGroup(CurScope, DS, DeclsInGroup.data(),
DeclsInGroup.size());
}
/// ParseCXXMemberSpecification - Parse the class definition.
///
/// member-specification:
/// member-declaration member-specification[opt]
/// access-specifier ':' member-specification[opt]
///
void Parser::ParseCXXMemberSpecification(SourceLocation RecordLoc,
unsigned TagType, DeclPtrTy TagDecl) {
assert((TagType == DeclSpec::TST_struct ||
TagType == DeclSpec::TST_union ||
TagType == DeclSpec::TST_class) && "Invalid TagType!");
PrettyStackTraceActionsDecl CrashInfo(TagDecl, RecordLoc, Actions,
PP.getSourceManager(),
"parsing struct/union/class body");
// Determine whether this is a non-nested class. Note that local
// classes are *not* considered to be nested classes.
bool NonNestedClass = true;
if (!ClassStack.empty()) {
for (const Scope *S = CurScope; S; S = S->getParent()) {
if (S->isClassScope()) {
// We're inside a class scope, so this is a nested class.
NonNestedClass = false;
break;
}
if ((S->getFlags() & Scope::FnScope)) {
// If we're in a function or function template declared in the
// body of a class, then this is a local class rather than a
// nested class.
const Scope *Parent = S->getParent();
if (Parent->isTemplateParamScope())
Parent = Parent->getParent();
if (Parent->isClassScope())
break;
}
}
}
// Enter a scope for the class.
ParseScope ClassScope(this, Scope::ClassScope|Scope::DeclScope);
// Note that we are parsing a new (potentially-nested) class definition.
ParsingClassDefinition ParsingDef(*this, TagDecl, NonNestedClass);
if (TagDecl)
Actions.ActOnTagStartDefinition(CurScope, TagDecl);
if (Tok.is(tok::colon)) {
ParseBaseClause(TagDecl);
if (!Tok.is(tok::l_brace)) {
Diag(Tok, diag::err_expected_lbrace_after_base_specifiers);
if (TagDecl)
Actions.ActOnTagDefinitionError(CurScope, TagDecl);
return;
}
}
assert(Tok.is(tok::l_brace));
SourceLocation LBraceLoc = ConsumeBrace();
if (!TagDecl) {
SkipUntil(tok::r_brace, false, false);
return;
}
Actions.ActOnStartCXXMemberDeclarations(CurScope, TagDecl, LBraceLoc);
// C++ 11p3: Members of a class defined with the keyword class are private
// by default. Members of a class defined with the keywords struct or union
// are public by default.
AccessSpecifier CurAS;
if (TagType == DeclSpec::TST_class)
CurAS = AS_private;
else
CurAS = AS_public;
// While we still have something to read, read the member-declarations.
while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
// Each iteration of this loop reads one member-declaration.
// Check for extraneous top-level semicolon.
if (Tok.is(tok::semi)) {
2009-11-06 14:40:12 +08:00
Diag(Tok, diag::ext_extra_struct_semi)
<< FixItHint::CreateRemoval(Tok.getLocation());
ConsumeToken();
continue;
}
AccessSpecifier AS = getAccessSpecifierIfPresent();
if (AS != AS_none) {
// Current token is a C++ access specifier.
CurAS = AS;
ConsumeToken();
ExpectAndConsume(tok::colon, diag::err_expected_colon);
continue;
}
// FIXME: Make sure we don't have a template here.
// Parse all the comma separated declarators.
ParseCXXClassMemberDeclaration(CurAS);
}
SourceLocation RBraceLoc = MatchRHSPunctuation(tok::r_brace, LBraceLoc);
// If attributes exist after class contents, parse them.
llvm::OwningPtr<AttributeList> AttrList;
if (Tok.is(tok::kw___attribute))
AttrList.reset(ParseGNUAttributes());
Actions.ActOnFinishCXXMemberSpecification(CurScope, RecordLoc, TagDecl,
LBraceLoc, RBraceLoc,
AttrList.get());
// C++ 9.2p2: Within the class member-specification, the class is regarded as
// complete within function bodies, default arguments,
// exception-specifications, and constructor ctor-initializers (including
// such things in nested classes).
//
// FIXME: Only function bodies and constructor ctor-initializers are
// parsed correctly, fix the rest.
if (NonNestedClass) {
// We are not inside a nested class. This class and its nested classes
// are complete and we can parse the delayed portions of method
// declarations and the lexed inline method definitions.
ParseLexedMethodDeclarations(getCurrentClass());
ParseLexedMethodDefs(getCurrentClass());
}
Actions.ActOnTagFinishDefinition(CurScope, TagDecl, RBraceLoc);
// Leave the class scope.
ParsingDef.Pop();
ClassScope.Exit();
}
/// ParseConstructorInitializer - Parse a C++ constructor initializer,
/// which explicitly initializes the members or base classes of a
/// class (C++ [class.base.init]). For example, the three initializers
/// after the ':' in the Derived constructor below:
///
/// @code
/// class Base { };
/// class Derived : Base {
/// int x;
/// float f;
/// public:
/// Derived(float f) : Base(), x(17), f(f) { }
/// };
/// @endcode
///
/// [C++] ctor-initializer:
/// ':' mem-initializer-list
///
/// [C++] mem-initializer-list:
/// mem-initializer
/// mem-initializer , mem-initializer-list
void Parser::ParseConstructorInitializer(DeclPtrTy ConstructorDecl) {
assert(Tok.is(tok::colon) && "Constructor initializer always starts with ':'");
SourceLocation ColonLoc = ConsumeToken();
llvm::SmallVector<MemInitTy*, 4> MemInitializers;
Rework base and member initialization in constructors, with several (necessarily simultaneous) changes: - CXXBaseOrMemberInitializer now contains only a single initializer rather than a set of initialiation arguments + a constructor. The single initializer covers all aspects of initialization, including constructor calls as necessary but also cleanup of temporaries created by the initializer (which we never handled before!). - Rework + simplify code generation for CXXBaseOrMemberInitializers, since we can now just emit the initializer as an initializer. - Switched base and member initialization over to the new initialization code (InitializationSequence), so that it - Improved diagnostics for the new initialization code when initializing bases and members, to match the diagnostics produced by the previous (special-purpose) code. - Simplify the representation of type-checked constructor initializers in templates; instead of keeping the fully-type-checked AST, which is rather hard to undo at template instantiation time, throw away the type-checked AST and store the raw expressions in the AST. This simplifies instantiation, but loses a little but of information in the AST. - When type-checking implicit base or member initializers within a dependent context, don't add the generated initializers into the AST, because they'll look like they were explicit. - Record in CXXConstructExpr when the constructor call is to initialize a base class, so that CodeGen does not have to infer it from context. This ensures that we call the right kind of constructor. There are also a few "opportunity" fixes here that were needed to not regress, for example: - Diagnose default-initialization of a const-qualified class that does not have a user-declared default constructor. We had this diagnostic specifically for bases and members, but missed it for variables. That's fixed now. - When defining the implicit constructors, destructor, and copy-assignment operator, set the CurContext to that constructor when we're defining the body. llvm-svn: 94952
2010-01-31 17:12:51 +08:00
bool AnyErrors = false;
do {
MemInitResult MemInit = ParseMemInitializer(ConstructorDecl);
if (!MemInit.isInvalid())
MemInitializers.push_back(MemInit.get());
Rework base and member initialization in constructors, with several (necessarily simultaneous) changes: - CXXBaseOrMemberInitializer now contains only a single initializer rather than a set of initialiation arguments + a constructor. The single initializer covers all aspects of initialization, including constructor calls as necessary but also cleanup of temporaries created by the initializer (which we never handled before!). - Rework + simplify code generation for CXXBaseOrMemberInitializers, since we can now just emit the initializer as an initializer. - Switched base and member initialization over to the new initialization code (InitializationSequence), so that it - Improved diagnostics for the new initialization code when initializing bases and members, to match the diagnostics produced by the previous (special-purpose) code. - Simplify the representation of type-checked constructor initializers in templates; instead of keeping the fully-type-checked AST, which is rather hard to undo at template instantiation time, throw away the type-checked AST and store the raw expressions in the AST. This simplifies instantiation, but loses a little but of information in the AST. - When type-checking implicit base or member initializers within a dependent context, don't add the generated initializers into the AST, because they'll look like they were explicit. - Record in CXXConstructExpr when the constructor call is to initialize a base class, so that CodeGen does not have to infer it from context. This ensures that we call the right kind of constructor. There are also a few "opportunity" fixes here that were needed to not regress, for example: - Diagnose default-initialization of a const-qualified class that does not have a user-declared default constructor. We had this diagnostic specifically for bases and members, but missed it for variables. That's fixed now. - When defining the implicit constructors, destructor, and copy-assignment operator, set the CurContext to that constructor when we're defining the body. llvm-svn: 94952
2010-01-31 17:12:51 +08:00
else
AnyErrors = true;
if (Tok.is(tok::comma))
ConsumeToken();
else if (Tok.is(tok::l_brace))
break;
else {
// Skip over garbage, until we get to '{'. Don't eat the '{'.
Diag(Tok.getLocation(), diag::err_expected_lbrace_or_comma);
SkipUntil(tok::l_brace, true, true);
break;
}
} while (true);
Actions.ActOnMemInitializers(ConstructorDecl, ColonLoc,
Rework base and member initialization in constructors, with several (necessarily simultaneous) changes: - CXXBaseOrMemberInitializer now contains only a single initializer rather than a set of initialiation arguments + a constructor. The single initializer covers all aspects of initialization, including constructor calls as necessary but also cleanup of temporaries created by the initializer (which we never handled before!). - Rework + simplify code generation for CXXBaseOrMemberInitializers, since we can now just emit the initializer as an initializer. - Switched base and member initialization over to the new initialization code (InitializationSequence), so that it - Improved diagnostics for the new initialization code when initializing bases and members, to match the diagnostics produced by the previous (special-purpose) code. - Simplify the representation of type-checked constructor initializers in templates; instead of keeping the fully-type-checked AST, which is rather hard to undo at template instantiation time, throw away the type-checked AST and store the raw expressions in the AST. This simplifies instantiation, but loses a little but of information in the AST. - When type-checking implicit base or member initializers within a dependent context, don't add the generated initializers into the AST, because they'll look like they were explicit. - Record in CXXConstructExpr when the constructor call is to initialize a base class, so that CodeGen does not have to infer it from context. This ensures that we call the right kind of constructor. There are also a few "opportunity" fixes here that were needed to not regress, for example: - Diagnose default-initialization of a const-qualified class that does not have a user-declared default constructor. We had this diagnostic specifically for bases and members, but missed it for variables. That's fixed now. - When defining the implicit constructors, destructor, and copy-assignment operator, set the CurContext to that constructor when we're defining the body. llvm-svn: 94952
2010-01-31 17:12:51 +08:00
MemInitializers.data(), MemInitializers.size(),
AnyErrors);
}
/// ParseMemInitializer - Parse a C++ member initializer, which is
/// part of a constructor initializer that explicitly initializes one
/// member or base class (C++ [class.base.init]). See
/// ParseConstructorInitializer for an example.
///
/// [C++] mem-initializer:
/// mem-initializer-id '(' expression-list[opt] ')'
///
/// [C++] mem-initializer-id:
/// '::'[opt] nested-name-specifier[opt] class-name
/// identifier
Parser::MemInitResult Parser::ParseMemInitializer(DeclPtrTy ConstructorDecl) {
// parse '::'[opt] nested-name-specifier[opt]
CXXScopeSpec SS;
ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/0, false);
TypeTy *TemplateTypeTy = 0;
if (Tok.is(tok::annot_template_id)) {
TemplateIdAnnotation *TemplateId
= static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
if (TemplateId->Kind == TNK_Type_template ||
TemplateId->Kind == TNK_Dependent_template_name) {
AnnotateTemplateIdTokenAsType(&SS);
assert(Tok.is(tok::annot_typename) && "template-id -> type failed");
TemplateTypeTy = Tok.getAnnotationValue();
}
}
if (!TemplateTypeTy && Tok.isNot(tok::identifier)) {
Diag(Tok, diag::err_expected_member_or_base_name);
return true;
}
// Get the identifier. This may be a member name or a class name,
// but we'll let the semantic analysis determine which it is.
IdentifierInfo *II = Tok.is(tok::identifier) ? Tok.getIdentifierInfo() : 0;
SourceLocation IdLoc = ConsumeToken();
// Parse the '('.
if (Tok.isNot(tok::l_paren)) {
Diag(Tok, diag::err_expected_lparen);
return true;
}
SourceLocation LParenLoc = ConsumeParen();
// Parse the optional expression-list.
ExprVector ArgExprs(Actions);
CommaLocsTy CommaLocs;
if (Tok.isNot(tok::r_paren) && ParseExpressionList(ArgExprs, CommaLocs)) {
SkipUntil(tok::r_paren);
return true;
}
SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
return Actions.ActOnMemInitializer(ConstructorDecl, CurScope, SS, II,
TemplateTypeTy, IdLoc,
LParenLoc, ArgExprs.take(),
ArgExprs.size(), CommaLocs.data(),
RParenLoc);
}
/// ParseExceptionSpecification - Parse a C++ exception-specification
/// (C++ [except.spec]).
///
/// exception-specification:
/// 'throw' '(' type-id-list [opt] ')'
/// [MS] 'throw' '(' '...' ')'
///
/// type-id-list:
/// type-id
/// type-id-list ',' type-id
///
bool Parser::ParseExceptionSpecification(SourceLocation &EndLoc,
llvm::SmallVector<TypeTy*, 2>
&Exceptions,
llvm::SmallVector<SourceRange, 2>
&Ranges,
bool &hasAnyExceptionSpec) {
assert(Tok.is(tok::kw_throw) && "expected throw");
SourceLocation ThrowLoc = ConsumeToken();
if (!Tok.is(tok::l_paren)) {
return Diag(Tok, diag::err_expected_lparen_after) << "throw";
}
SourceLocation LParenLoc = ConsumeParen();
// Parse throw(...), a Microsoft extension that means "this function
// can throw anything".
if (Tok.is(tok::ellipsis)) {
hasAnyExceptionSpec = true;
SourceLocation EllipsisLoc = ConsumeToken();
if (!getLang().Microsoft)
Diag(EllipsisLoc, diag::ext_ellipsis_exception_spec);
EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
return false;
}
// Parse the sequence of type-ids.
SourceRange Range;
while (Tok.isNot(tok::r_paren)) {
TypeResult Res(ParseTypeName(&Range));
if (!Res.isInvalid()) {
Exceptions.push_back(Res.get());
Ranges.push_back(Range);
}
if (Tok.is(tok::comma))
ConsumeToken();
else
break;
}
EndLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
return false;
}
/// \brief We have just started parsing the definition of a new class,
/// so push that class onto our stack of classes that is currently
/// being parsed.
void Parser::PushParsingClass(DeclPtrTy ClassDecl, bool NonNestedClass) {
assert((NonNestedClass || !ClassStack.empty()) &&
"Nested class without outer class");
ClassStack.push(new ParsingClass(ClassDecl, NonNestedClass));
}
/// \brief Deallocate the given parsed class and all of its nested
/// classes.
void Parser::DeallocateParsedClasses(Parser::ParsingClass *Class) {
for (unsigned I = 0, N = Class->NestedClasses.size(); I != N; ++I)
DeallocateParsedClasses(Class->NestedClasses[I]);
delete Class;
}
/// \brief Pop the top class of the stack of classes that are
/// currently being parsed.
///
/// This routine should be called when we have finished parsing the
/// definition of a class, but have not yet popped the Scope
/// associated with the class's definition.
///
/// \returns true if the class we've popped is a top-level class,
/// false otherwise.
void Parser::PopParsingClass() {
assert(!ClassStack.empty() && "Mismatched push/pop for class parsing");
ParsingClass *Victim = ClassStack.top();
ClassStack.pop();
if (Victim->TopLevelClass) {
// Deallocate all of the nested classes of this class,
// recursively: we don't need to keep any of this information.
DeallocateParsedClasses(Victim);
return;
}
assert(!ClassStack.empty() && "Missing top-level class?");
if (Victim->MethodDecls.empty() && Victim->MethodDefs.empty() &&
Victim->NestedClasses.empty()) {
// The victim is a nested class, but we will not need to perform
// any processing after the definition of this class since it has
// no members whose handling was delayed. Therefore, we can just
// remove this nested class.
delete Victim;
return;
}
// This nested class has some members that will need to be processed
// after the top-level class is completely defined. Therefore, add
// it to the list of nested classes within its parent.
assert(CurScope->isClassScope() && "Nested class outside of class scope?");
ClassStack.top()->NestedClasses.push_back(Victim);
Victim->TemplateScope = CurScope->getParent()->isTemplateParamScope();
}
/// ParseCXX0XAttributes - Parse a C++0x attribute-specifier. Currently only
/// parses standard attributes.
///
/// [C++0x] attribute-specifier:
/// '[' '[' attribute-list ']' ']'
///
/// [C++0x] attribute-list:
/// attribute[opt]
/// attribute-list ',' attribute[opt]
///
/// [C++0x] attribute:
/// attribute-token attribute-argument-clause[opt]
///
/// [C++0x] attribute-token:
/// identifier
/// attribute-scoped-token
///
/// [C++0x] attribute-scoped-token:
/// attribute-namespace '::' identifier
///
/// [C++0x] attribute-namespace:
/// identifier
///
/// [C++0x] attribute-argument-clause:
/// '(' balanced-token-seq ')'
///
/// [C++0x] balanced-token-seq:
/// balanced-token
/// balanced-token-seq balanced-token
///
/// [C++0x] balanced-token:
/// '(' balanced-token-seq ')'
/// '[' balanced-token-seq ']'
/// '{' balanced-token-seq '}'
/// any token but '(', ')', '[', ']', '{', or '}'
CXX0XAttributeList Parser::ParseCXX0XAttributes(SourceLocation *EndLoc) {
assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square)
&& "Not a C++0x attribute list");
SourceLocation StartLoc = Tok.getLocation(), Loc;
AttributeList *CurrAttr = 0;
ConsumeBracket();
ConsumeBracket();
if (Tok.is(tok::comma)) {
Diag(Tok.getLocation(), diag::err_expected_ident);
ConsumeToken();
}
while (Tok.is(tok::identifier) || Tok.is(tok::comma)) {
// attribute not present
if (Tok.is(tok::comma)) {
ConsumeToken();
continue;
}
IdentifierInfo *ScopeName = 0, *AttrName = Tok.getIdentifierInfo();
SourceLocation ScopeLoc, AttrLoc = ConsumeToken();
// scoped attribute
if (Tok.is(tok::coloncolon)) {
ConsumeToken();
if (!Tok.is(tok::identifier)) {
Diag(Tok.getLocation(), diag::err_expected_ident);
SkipUntil(tok::r_square, tok::comma, true, true);
continue;
}
ScopeName = AttrName;
ScopeLoc = AttrLoc;
AttrName = Tok.getIdentifierInfo();
AttrLoc = ConsumeToken();
}
bool AttrParsed = false;
// No scoped names are supported; ideally we could put all non-standard
// attributes into namespaces.
if (!ScopeName) {
switch(AttributeList::getKind(AttrName))
{
// No arguments
case AttributeList::AT_base_check:
case AttributeList::AT_carries_dependency:
case AttributeList::AT_final:
case AttributeList::AT_hiding:
case AttributeList::AT_noreturn:
case AttributeList::AT_override: {
if (Tok.is(tok::l_paren)) {
Diag(Tok.getLocation(), diag::err_cxx0x_attribute_forbids_arguments)
<< AttrName->getName();
break;
}
CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc, 0,
SourceLocation(), 0, 0, CurrAttr, false,
true);
AttrParsed = true;
break;
}
// One argument; must be a type-id or assignment-expression
case AttributeList::AT_aligned: {
if (Tok.isNot(tok::l_paren)) {
Diag(Tok.getLocation(), diag::err_cxx0x_attribute_requires_arguments)
<< AttrName->getName();
break;
}
SourceLocation ParamLoc = ConsumeParen();
OwningExprResult ArgExpr = ParseCXX0XAlignArgument(ParamLoc);
MatchRHSPunctuation(tok::r_paren, ParamLoc);
ExprVector ArgExprs(Actions);
ArgExprs.push_back(ArgExpr.release());
CurrAttr = new AttributeList(AttrName, AttrLoc, 0, AttrLoc,
0, ParamLoc, ArgExprs.take(), 1, CurrAttr,
false, true);
AttrParsed = true;
break;
}
// Silence warnings
default: break;
}
}
// Skip the entire parameter clause, if any
if (!AttrParsed && Tok.is(tok::l_paren)) {
ConsumeParen();
// SkipUntil maintains the balancedness of tokens.
SkipUntil(tok::r_paren, false);
}
}
if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
SkipUntil(tok::r_square, false);
Loc = Tok.getLocation();
if (ExpectAndConsume(tok::r_square, diag::err_expected_rsquare))
SkipUntil(tok::r_square, false);
CXX0XAttributeList Attr (CurrAttr, SourceRange(StartLoc, Loc), true);
return Attr;
}
/// ParseCXX0XAlignArgument - Parse the argument to C++0x's [[align]]
/// attribute.
///
/// FIXME: Simply returns an alignof() expression if the argument is a
/// type. Ideally, the type should be propagated directly into Sema.
///
/// [C++0x] 'align' '(' type-id ')'
/// [C++0x] 'align' '(' assignment-expression ')'
Parser::OwningExprResult Parser::ParseCXX0XAlignArgument(SourceLocation Start) {
if (isTypeIdInParens()) {
EnterExpressionEvaluationContext Unevaluated(Actions,
Action::Unevaluated);
SourceLocation TypeLoc = Tok.getLocation();
TypeTy *Ty = ParseTypeName().get();
SourceRange TypeRange(Start, Tok.getLocation());
return Actions.ActOnSizeOfAlignOfExpr(TypeLoc, false, true, Ty,
TypeRange);
} else
return ParseConstantExpression();
}