static bool ParseReductionId(Parser &P, CXXScopeSpec &ReductionIdScopeSpec,
UnqualifiedId &ReductionId) {
SourceLocation TemplateKWLoc;
if (ReductionIdScopeSpec.isEmpty()) {
auto OOK = OO_None;
switch (P.getCurToken().getKind()) {
case tok::plus:
OOK = OO_Plus;
break;
case tok::minus:
OOK = OO_Minus;
break;
case tok::star:
OOK = OO_Star;
break;
case tok::amp:
OOK = OO_Amp;
break;
case tok::pipe:
OOK = OO_Pipe;
break;
case tok::caret:
OOK = OO_Caret;
break;
case tok::ampamp:
OOK = OO_AmpAmp;
break;
case tok::pipepipe:
OOK = OO_PipePipe;
break;
default:
break;
}
if (OOK != OO_None) {
SourceLocation OpLoc = P.ConsumeToken();
SourceLocation SymbolLocations[] = {OpLoc, OpLoc, SourceLocation()};
ReductionId.setOperatorFunctionId(OpLoc, OOK, SymbolLocations);
return false;
}
}
return P.ParseUnqualifiedId(ReductionIdScopeSpec, /*EnteringContext*/ false,
/*AllowDestructorName*/ false,
/*AllowConstructorName*/ false, ParsedType(),
TemplateKWLoc, ReductionId);
}
/// TryAnnotateTypeOrScopeToken - If the current token position is on a
/// typename (possibly qualified in C++) or a C++ scope specifier not followed
/// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
/// with a single annotation token representing the typename or C++ scope
/// respectively.
/// This simplifies handling of C++ scope specifiers and allows efficient
/// backtracking without the need to re-parse and resolve nested-names and
/// typenames.
/// It will mainly be called when we expect to treat identifiers as typenames
/// (if they are typenames). For example, in C we do not expect identifiers
/// inside expressions to be treated as typenames so it will not be called
/// for expressions in C.
/// The benefit for C/ObjC is that a typename will be annotated and
/// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
/// will not be called twice, once to check whether we have a declaration
/// specifier, and another one to get the actual type inside
/// ParseDeclarationSpecifiers).
///
/// This returns true if the token was annotated or an unrecoverable error
/// occurs.
///
/// Note that this routine emits an error if you call it with ::new or ::delete
/// as the current tokens, so only call it in contexts where these are invalid.
bool Parser::TryAnnotateTypeOrScopeToken() {
assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon)
|| Tok.is(tok::kw_typename)) &&
"Cannot be a type or scope token!");
if (Tok.is(tok::kw_typename)) {
// Parse a C++ typename-specifier, e.g., "typename T::type".
//
// typename-specifier:
// 'typename' '::' [opt] nested-name-specifier identifier
// 'typename' '::' [opt] nested-name-specifier template [opt]
// simple-template-id
SourceLocation TypenameLoc = ConsumeToken();
CXXScopeSpec SS;
bool HadNestedNameSpecifier = ParseOptionalCXXScopeSpecifier(SS);
if (!HadNestedNameSpecifier) {
Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
return false;
}
TypeResult Ty;
if (Tok.is(tok::identifier)) {
// FIXME: check whether the next token is '<', first!
Ty = Actions.ActOnTypenameType(TypenameLoc, SS, *Tok.getIdentifierInfo(),
Tok.getLocation());
} else if (Tok.is(tok::annot_template_id)) {
TemplateIdAnnotation *TemplateId
= static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
if (TemplateId->Kind == TNK_Function_template) {
Diag(Tok, diag::err_typename_refers_to_non_type_template)
<< Tok.getAnnotationRange();
return false;
}
AnnotateTemplateIdTokenAsType(0);
assert(Tok.is(tok::annot_typename) &&
"AnnotateTemplateIdTokenAsType isn't working properly");
if (Tok.getAnnotationValue())
Ty = Actions.ActOnTypenameType(TypenameLoc, SS, SourceLocation(),
Tok.getAnnotationValue());
else
Ty = true;
} else {
Diag(Tok, diag::err_expected_type_name_after_typename)
<< SS.getRange();
return false;
}
Tok.setKind(tok::annot_typename);
Tok.setAnnotationValue(Ty.isInvalid()? 0 : Ty.get());
Tok.setAnnotationEndLoc(Tok.getLocation());
Tok.setLocation(TypenameLoc);
PP.AnnotateCachedTokens(Tok);
return true;
}
CXXScopeSpec SS;
if (getLang().CPlusPlus)
ParseOptionalCXXScopeSpecifier(SS);
if (Tok.is(tok::identifier)) {
// Determine whether the identifier is a type name.
if (TypeTy *Ty = Actions.getTypeName(*Tok.getIdentifierInfo(),
Tok.getLocation(), CurScope, &SS)) {
// This is a typename. Replace the current token in-place with an
// annotation type token.
Tok.setKind(tok::annot_typename);
Tok.setAnnotationValue(Ty);
Tok.setAnnotationEndLoc(Tok.getLocation());
if (SS.isNotEmpty()) // it was a C++ qualified type name.
Tok.setLocation(SS.getBeginLoc());
// In case the tokens were cached, have Preprocessor replace
// them with the annotation token.
PP.AnnotateCachedTokens(Tok);
return true;
}
if (!getLang().CPlusPlus) {
// If we're in C, we can't have :: tokens at all (the lexer won't return
// them). If the identifier is not a type, then it can't be scope either,
// just early exit.
return false;
}
// If this is a template-id, annotate with a template-id or type token.
if (NextToken().is(tok::less)) {
TemplateTy Template;
if (TemplateNameKind TNK
= Actions.isTemplateName(*Tok.getIdentifierInfo(),
CurScope, Template, &SS))
if (AnnotateTemplateIdToken(Template, TNK, &SS)) {
// If an unrecoverable error occurred, we need to return true here,
// because the token stream is in a damaged state. We may not return
// a valid identifier.
return Tok.isNot(tok::identifier);
}
}
// The current token, which is either an identifier or a
// template-id, is not part of the annotation. Fall through to
// push that token back into the stream and complete the C++ scope
// specifier annotation.
}
if (Tok.is(tok::annot_template_id)) {
TemplateIdAnnotation *TemplateId
= static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
if (TemplateId->Kind == TNK_Type_template) {
// A template-id that refers to a type was parsed into a
// template-id annotation in a context where we weren't allowed
// to produce a type annotation token. Update the template-id
// annotation token to a type annotation token now.
AnnotateTemplateIdTokenAsType(&SS);
return true;
}
}
if (SS.isEmpty())
return Tok.isNot(tok::identifier) && Tok.isNot(tok::coloncolon);
// A C++ scope specifier that isn't followed by a typename.
// Push the current token back into the token stream (or revert it if it is
// cached) and use an annotation scope token for current token.
if (PP.isBacktrackEnabled())
PP.RevertCachedTokens(1);
else
PP.EnterToken(Tok);
Tok.setKind(tok::annot_cxxscope);
Tok.setAnnotationValue(SS.getScopeRep());
Tok.setAnnotationRange(SS.getRange());
// In case the tokens were cached, have Preprocessor replace them with the
// annotation token.
PP.AnnotateCachedTokens(Tok);
return true;
}
