forked from OSchip/llvm-project
1218 lines
41 KiB
C++
1218 lines
41 KiB
C++
//===--- ParseExprCXX.cpp - C++ Expression Parsing ------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Expression parsing implementation for C++.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Parse/ParseDiagnostic.h"
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#include "clang/Parse/Parser.h"
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#include "clang/Parse/DeclSpec.h"
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using namespace clang;
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/// ParseOptionalCXXScopeSpecifier - Parse global scope or
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/// nested-name-specifier if present. Returns true if a nested-name-specifier
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/// was parsed from the token stream. Note that this routine will not parse
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/// ::new or ::delete, it will just leave them in the token stream.
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///
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/// '::'[opt] nested-name-specifier
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/// '::'
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///
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/// nested-name-specifier:
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/// type-name '::'
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/// namespace-name '::'
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/// nested-name-specifier identifier '::'
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/// nested-name-specifier 'template'[opt] simple-template-id '::' [TODO]
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///
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bool Parser::ParseOptionalCXXScopeSpecifier(CXXScopeSpec &SS) {
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assert(getLang().CPlusPlus &&
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"Call sites of this function should be guarded by checking for C++");
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if (Tok.is(tok::annot_cxxscope)) {
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SS.setScopeRep(Tok.getAnnotationValue());
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SS.setRange(Tok.getAnnotationRange());
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ConsumeToken();
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return true;
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}
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bool HasScopeSpecifier = false;
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if (Tok.is(tok::coloncolon)) {
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// ::new and ::delete aren't nested-name-specifiers.
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tok::TokenKind NextKind = NextToken().getKind();
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if (NextKind == tok::kw_new || NextKind == tok::kw_delete)
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return false;
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// '::' - Global scope qualifier.
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SourceLocation CCLoc = ConsumeToken();
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SS.setBeginLoc(CCLoc);
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SS.setScopeRep(Actions.ActOnCXXGlobalScopeSpecifier(CurScope, CCLoc));
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SS.setEndLoc(CCLoc);
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HasScopeSpecifier = true;
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}
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while (true) {
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// nested-name-specifier:
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// nested-name-specifier 'template'[opt] simple-template-id '::'
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// Parse the optional 'template' keyword, then make sure we have
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// 'identifier <' after it.
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if (Tok.is(tok::kw_template)) {
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SourceLocation TemplateKWLoc = ConsumeToken();
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if (Tok.isNot(tok::identifier)) {
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Diag(Tok.getLocation(),
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diag::err_id_after_template_in_nested_name_spec)
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<< SourceRange(TemplateKWLoc);
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break;
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}
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if (NextToken().isNot(tok::less)) {
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Diag(NextToken().getLocation(),
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diag::err_less_after_template_name_in_nested_name_spec)
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<< Tok.getIdentifierInfo()->getName()
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<< SourceRange(TemplateKWLoc, Tok.getLocation());
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break;
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}
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TemplateTy Template
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= Actions.ActOnDependentTemplateName(TemplateKWLoc,
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*Tok.getIdentifierInfo(),
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Tok.getLocation(), SS);
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if (AnnotateTemplateIdToken(Template, TNK_Dependent_template_name,
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&SS, TemplateKWLoc, false))
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break;
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continue;
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}
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if (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) {
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// We have
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//
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// simple-template-id '::'
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//
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// So we need to check whether the simple-template-id is of the
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// right kind (it should name a type or be dependent), and then
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// convert it into a type within the nested-name-specifier.
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TemplateIdAnnotation *TemplateId
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= static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
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if (TemplateId->Kind == TNK_Type_template ||
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TemplateId->Kind == TNK_Dependent_template_name) {
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AnnotateTemplateIdTokenAsType(&SS);
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SS.setScopeRep(0);
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assert(Tok.is(tok::annot_typename) &&
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"AnnotateTemplateIdTokenAsType isn't working");
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Token TypeToken = Tok;
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ConsumeToken();
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assert(Tok.is(tok::coloncolon) && "NextToken() not working properly!");
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SourceLocation CCLoc = ConsumeToken();
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if (!HasScopeSpecifier) {
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SS.setBeginLoc(TypeToken.getLocation());
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HasScopeSpecifier = true;
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}
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if (TypeToken.getAnnotationValue())
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SS.setScopeRep(
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Actions.ActOnCXXNestedNameSpecifier(CurScope, SS,
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TypeToken.getAnnotationValue(),
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TypeToken.getAnnotationRange(),
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CCLoc));
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else
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SS.setScopeRep(0);
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SS.setEndLoc(CCLoc);
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continue;
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}
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assert(false && "FIXME: Only type template names supported here");
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}
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// The rest of the nested-name-specifier possibilities start with
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// tok::identifier.
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if (Tok.isNot(tok::identifier))
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break;
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IdentifierInfo &II = *Tok.getIdentifierInfo();
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// nested-name-specifier:
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// type-name '::'
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// namespace-name '::'
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// nested-name-specifier identifier '::'
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Token Next = NextToken();
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if (Next.is(tok::coloncolon)) {
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// We have an identifier followed by a '::'. Lookup this name
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// as the name in a nested-name-specifier.
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SourceLocation IdLoc = ConsumeToken();
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assert(Tok.is(tok::coloncolon) && "NextToken() not working properly!");
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SourceLocation CCLoc = ConsumeToken();
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if (!HasScopeSpecifier) {
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SS.setBeginLoc(IdLoc);
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HasScopeSpecifier = true;
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}
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if (SS.isInvalid())
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continue;
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SS.setScopeRep(
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Actions.ActOnCXXNestedNameSpecifier(CurScope, SS, IdLoc, CCLoc, II));
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SS.setEndLoc(CCLoc);
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continue;
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}
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// nested-name-specifier:
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// type-name '<'
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if (Next.is(tok::less)) {
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TemplateTy Template;
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if (TemplateNameKind TNK = Actions.isTemplateName(II, CurScope,
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Template, &SS)) {
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// We have found a template name, so annotate this this token
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// with a template-id annotation. We do not permit the
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// template-id to be translated into a type annotation,
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// because some clients (e.g., the parsing of class template
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// specializations) still want to see the original template-id
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// token.
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if (AnnotateTemplateIdToken(Template, TNK, &SS, SourceLocation(),
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false))
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break;
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continue;
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}
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}
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// We don't have any tokens that form the beginning of a
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// nested-name-specifier, so we're done.
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break;
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}
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return HasScopeSpecifier;
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}
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/// ParseCXXIdExpression - Handle id-expression.
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///
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/// id-expression:
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/// unqualified-id
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/// qualified-id
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///
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/// unqualified-id:
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/// identifier
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/// operator-function-id
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/// conversion-function-id [TODO]
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/// '~' class-name [TODO]
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/// template-id
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///
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/// qualified-id:
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/// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id
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/// '::' identifier
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/// '::' operator-function-id
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/// '::' template-id
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///
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/// nested-name-specifier:
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/// type-name '::'
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/// namespace-name '::'
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/// nested-name-specifier identifier '::'
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/// nested-name-specifier 'template'[opt] simple-template-id '::' [TODO]
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///
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/// NOTE: The standard specifies that, for qualified-id, the parser does not
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/// expect:
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///
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/// '::' conversion-function-id
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/// '::' '~' class-name
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///
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/// This may cause a slight inconsistency on diagnostics:
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///
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/// class C {};
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/// namespace A {}
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/// void f() {
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/// :: A :: ~ C(); // Some Sema error about using destructor with a
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/// // namespace.
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/// :: ~ C(); // Some Parser error like 'unexpected ~'.
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/// }
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///
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/// We simplify the parser a bit and make it work like:
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///
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/// qualified-id:
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/// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id
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/// '::' unqualified-id
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///
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/// That way Sema can handle and report similar errors for namespaces and the
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/// global scope.
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///
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/// The isAddressOfOperand parameter indicates that this id-expression is a
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/// direct operand of the address-of operator. This is, besides member contexts,
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/// the only place where a qualified-id naming a non-static class member may
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/// appear.
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///
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Parser::OwningExprResult Parser::ParseCXXIdExpression(bool isAddressOfOperand) {
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// qualified-id:
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// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id
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// '::' unqualified-id
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//
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CXXScopeSpec SS;
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ParseOptionalCXXScopeSpecifier(SS);
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// unqualified-id:
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// identifier
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// operator-function-id
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// conversion-function-id
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// '~' class-name [TODO]
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// template-id
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//
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switch (Tok.getKind()) {
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default:
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return ExprError(Diag(Tok, diag::err_expected_unqualified_id));
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case tok::identifier: {
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// Consume the identifier so that we can see if it is followed by a '('.
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IdentifierInfo &II = *Tok.getIdentifierInfo();
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SourceLocation L = ConsumeToken();
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return Actions.ActOnIdentifierExpr(CurScope, L, II, Tok.is(tok::l_paren),
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&SS, isAddressOfOperand);
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}
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case tok::kw_operator: {
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SourceLocation OperatorLoc = Tok.getLocation();
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if (OverloadedOperatorKind Op = TryParseOperatorFunctionId())
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return Actions.ActOnCXXOperatorFunctionIdExpr(
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CurScope, OperatorLoc, Op, Tok.is(tok::l_paren), SS,
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isAddressOfOperand);
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if (TypeTy *Type = ParseConversionFunctionId())
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return Actions.ActOnCXXConversionFunctionExpr(CurScope, OperatorLoc, Type,
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Tok.is(tok::l_paren), SS,
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isAddressOfOperand);
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// We already complained about a bad conversion-function-id,
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// above.
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return ExprError();
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}
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case tok::annot_template_id: {
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TemplateIdAnnotation *TemplateId
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= static_cast<TemplateIdAnnotation *>(Tok.getAnnotationValue());
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assert((TemplateId->Kind == TNK_Function_template ||
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TemplateId->Kind == TNK_Dependent_template_name) &&
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"A template type name is not an ID expression");
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ASTTemplateArgsPtr TemplateArgsPtr(Actions,
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TemplateId->getTemplateArgs(),
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TemplateId->getTemplateArgIsType(),
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TemplateId->NumArgs);
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OwningExprResult Result
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= Actions.ActOnTemplateIdExpr(TemplateTy::make(TemplateId->Template),
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TemplateId->TemplateNameLoc,
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TemplateId->LAngleLoc,
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TemplateArgsPtr,
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TemplateId->getTemplateArgLocations(),
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TemplateId->RAngleLoc);
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ConsumeToken(); // Consume the template-id token
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return move(Result);
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}
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} // switch.
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assert(0 && "The switch was supposed to take care everything.");
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}
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/// ParseCXXCasts - This handles the various ways to cast expressions to another
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/// type.
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///
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/// postfix-expression: [C++ 5.2p1]
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/// 'dynamic_cast' '<' type-name '>' '(' expression ')'
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/// 'static_cast' '<' type-name '>' '(' expression ')'
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/// 'reinterpret_cast' '<' type-name '>' '(' expression ')'
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/// 'const_cast' '<' type-name '>' '(' expression ')'
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///
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Parser::OwningExprResult Parser::ParseCXXCasts() {
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tok::TokenKind Kind = Tok.getKind();
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const char *CastName = 0; // For error messages
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switch (Kind) {
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default: assert(0 && "Unknown C++ cast!"); abort();
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case tok::kw_const_cast: CastName = "const_cast"; break;
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case tok::kw_dynamic_cast: CastName = "dynamic_cast"; break;
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case tok::kw_reinterpret_cast: CastName = "reinterpret_cast"; break;
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case tok::kw_static_cast: CastName = "static_cast"; break;
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}
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SourceLocation OpLoc = ConsumeToken();
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SourceLocation LAngleBracketLoc = Tok.getLocation();
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if (ExpectAndConsume(tok::less, diag::err_expected_less_after, CastName))
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return ExprError();
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TypeResult CastTy = ParseTypeName();
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SourceLocation RAngleBracketLoc = Tok.getLocation();
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if (ExpectAndConsume(tok::greater, diag::err_expected_greater))
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return ExprError(Diag(LAngleBracketLoc, diag::note_matching) << "<");
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SourceLocation LParenLoc = Tok.getLocation(), RParenLoc;
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if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, CastName))
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return ExprError();
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OwningExprResult Result = ParseExpression();
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// Match the ')'.
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if (Result.isInvalid())
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SkipUntil(tok::r_paren);
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if (Tok.is(tok::r_paren))
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RParenLoc = ConsumeParen();
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else
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MatchRHSPunctuation(tok::r_paren, LParenLoc);
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if (!Result.isInvalid() && !CastTy.isInvalid())
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Result = Actions.ActOnCXXNamedCast(OpLoc, Kind,
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LAngleBracketLoc, CastTy.get(),
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RAngleBracketLoc,
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LParenLoc, move(Result), RParenLoc);
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return move(Result);
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}
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/// ParseCXXTypeid - This handles the C++ typeid expression.
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///
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/// postfix-expression: [C++ 5.2p1]
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/// 'typeid' '(' expression ')'
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/// 'typeid' '(' type-id ')'
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///
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Parser::OwningExprResult Parser::ParseCXXTypeid() {
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assert(Tok.is(tok::kw_typeid) && "Not 'typeid'!");
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SourceLocation OpLoc = ConsumeToken();
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SourceLocation LParenLoc = Tok.getLocation();
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SourceLocation RParenLoc;
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// typeid expressions are always parenthesized.
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if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
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"typeid"))
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return ExprError();
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OwningExprResult Result(Actions);
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if (isTypeIdInParens()) {
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TypeResult Ty = ParseTypeName();
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// Match the ')'.
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MatchRHSPunctuation(tok::r_paren, LParenLoc);
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if (Ty.isInvalid())
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return ExprError();
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Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/true,
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Ty.get(), RParenLoc);
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} else {
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// C++0x [expr.typeid]p3:
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// When typeid is applied to an expression other than an lvalue of a
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// polymorphic class type [...] The expression is an unevaluated
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// operand (Clause 5).
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//
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// Note that we can't tell whether the expression is an lvalue of a
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// polymorphic class type until after we've parsed the expression, so
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// we the expression is potentially potentially evaluated.
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EnterExpressionEvaluationContext Unevaluated(Actions,
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Action::PotentiallyPotentiallyEvaluated);
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Result = ParseExpression();
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// Match the ')'.
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if (Result.isInvalid())
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SkipUntil(tok::r_paren);
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else {
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MatchRHSPunctuation(tok::r_paren, LParenLoc);
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Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/false,
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Result.release(), RParenLoc);
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}
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}
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return move(Result);
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}
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/// ParseCXXBoolLiteral - This handles the C++ Boolean literals.
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///
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/// boolean-literal: [C++ 2.13.5]
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/// 'true'
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/// 'false'
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Parser::OwningExprResult Parser::ParseCXXBoolLiteral() {
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tok::TokenKind Kind = Tok.getKind();
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return Actions.ActOnCXXBoolLiteral(ConsumeToken(), Kind);
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}
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/// ParseThrowExpression - This handles the C++ throw expression.
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///
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/// throw-expression: [C++ 15]
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/// 'throw' assignment-expression[opt]
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Parser::OwningExprResult Parser::ParseThrowExpression() {
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assert(Tok.is(tok::kw_throw) && "Not throw!");
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SourceLocation ThrowLoc = ConsumeToken(); // Eat the throw token.
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// If the current token isn't the start of an assignment-expression,
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// then the expression is not present. This handles things like:
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// "C ? throw : (void)42", which is crazy but legal.
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switch (Tok.getKind()) { // FIXME: move this predicate somewhere common.
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case tok::semi:
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case tok::r_paren:
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case tok::r_square:
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case tok::r_brace:
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case tok::colon:
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case tok::comma:
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return Actions.ActOnCXXThrow(ThrowLoc, ExprArg(Actions));
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default:
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OwningExprResult Expr(ParseAssignmentExpression());
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if (Expr.isInvalid()) return move(Expr);
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return Actions.ActOnCXXThrow(ThrowLoc, move(Expr));
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}
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}
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/// ParseCXXThis - This handles the C++ 'this' pointer.
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///
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/// C++ 9.3.2: In the body of a non-static member function, the keyword this is
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/// a non-lvalue expression whose value is the address of the object for which
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/// the function is called.
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Parser::OwningExprResult Parser::ParseCXXThis() {
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assert(Tok.is(tok::kw_this) && "Not 'this'!");
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SourceLocation ThisLoc = ConsumeToken();
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return Actions.ActOnCXXThis(ThisLoc);
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}
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/// ParseCXXTypeConstructExpression - Parse construction of a specified type.
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/// Can be interpreted either as function-style casting ("int(x)")
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/// or class type construction ("ClassType(x,y,z)")
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/// or creation of a value-initialized type ("int()").
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///
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/// postfix-expression: [C++ 5.2p1]
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/// simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
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/// typename-specifier '(' expression-list[opt] ')' [TODO]
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///
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Parser::OwningExprResult
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Parser::ParseCXXTypeConstructExpression(const DeclSpec &DS) {
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Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
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TypeTy *TypeRep = Actions.ActOnTypeName(CurScope, DeclaratorInfo).get();
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assert(Tok.is(tok::l_paren) && "Expected '('!");
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SourceLocation LParenLoc = ConsumeParen();
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ExprVector Exprs(Actions);
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CommaLocsTy CommaLocs;
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if (Tok.isNot(tok::r_paren)) {
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if (ParseExpressionList(Exprs, CommaLocs)) {
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SkipUntil(tok::r_paren);
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return ExprError();
|
|
}
|
|
}
|
|
|
|
// Match the ')'.
|
|
SourceLocation RParenLoc = MatchRHSPunctuation(tok::r_paren, LParenLoc);
|
|
|
|
assert((Exprs.size() == 0 || Exprs.size()-1 == CommaLocs.size())&&
|
|
"Unexpected number of commas!");
|
|
return Actions.ActOnCXXTypeConstructExpr(DS.getSourceRange(), TypeRep,
|
|
LParenLoc, move_arg(Exprs),
|
|
CommaLocs.data(), RParenLoc);
|
|
}
|
|
|
|
/// ParseCXXCondition - if/switch/while/for condition expression.
|
|
///
|
|
/// condition:
|
|
/// expression
|
|
/// type-specifier-seq declarator '=' assignment-expression
|
|
/// [GNU] type-specifier-seq declarator simple-asm-expr[opt] attributes[opt]
|
|
/// '=' assignment-expression
|
|
///
|
|
Parser::OwningExprResult Parser::ParseCXXCondition() {
|
|
if (!isCXXConditionDeclaration())
|
|
return ParseExpression(); // expression
|
|
|
|
SourceLocation StartLoc = Tok.getLocation();
|
|
|
|
// type-specifier-seq
|
|
DeclSpec DS;
|
|
ParseSpecifierQualifierList(DS);
|
|
|
|
// declarator
|
|
Declarator DeclaratorInfo(DS, Declarator::ConditionContext);
|
|
ParseDeclarator(DeclaratorInfo);
|
|
|
|
// simple-asm-expr[opt]
|
|
if (Tok.is(tok::kw_asm)) {
|
|
SourceLocation Loc;
|
|
OwningExprResult AsmLabel(ParseSimpleAsm(&Loc));
|
|
if (AsmLabel.isInvalid()) {
|
|
SkipUntil(tok::semi);
|
|
return ExprError();
|
|
}
|
|
DeclaratorInfo.setAsmLabel(AsmLabel.release());
|
|
DeclaratorInfo.SetRangeEnd(Loc);
|
|
}
|
|
|
|
// If attributes are present, parse them.
|
|
if (Tok.is(tok::kw___attribute)) {
|
|
SourceLocation Loc;
|
|
AttributeList *AttrList = ParseAttributes(&Loc);
|
|
DeclaratorInfo.AddAttributes(AttrList, Loc);
|
|
}
|
|
|
|
// '=' assignment-expression
|
|
if (Tok.isNot(tok::equal))
|
|
return ExprError(Diag(Tok, diag::err_expected_equal_after_declarator));
|
|
SourceLocation EqualLoc = ConsumeToken();
|
|
OwningExprResult AssignExpr(ParseAssignmentExpression());
|
|
if (AssignExpr.isInvalid())
|
|
return ExprError();
|
|
|
|
return Actions.ActOnCXXConditionDeclarationExpr(CurScope, StartLoc,
|
|
DeclaratorInfo,EqualLoc,
|
|
move(AssignExpr));
|
|
}
|
|
|
|
/// ParseCXXSimpleTypeSpecifier - [C++ 7.1.5.2] Simple type specifiers.
|
|
/// This should only be called when the current token is known to be part of
|
|
/// simple-type-specifier.
|
|
///
|
|
/// simple-type-specifier:
|
|
/// '::'[opt] nested-name-specifier[opt] type-name
|
|
/// '::'[opt] nested-name-specifier 'template' simple-template-id [TODO]
|
|
/// char
|
|
/// wchar_t
|
|
/// bool
|
|
/// short
|
|
/// int
|
|
/// long
|
|
/// signed
|
|
/// unsigned
|
|
/// float
|
|
/// double
|
|
/// void
|
|
/// [GNU] typeof-specifier
|
|
/// [C++0x] auto [TODO]
|
|
///
|
|
/// type-name:
|
|
/// class-name
|
|
/// enum-name
|
|
/// typedef-name
|
|
///
|
|
void Parser::ParseCXXSimpleTypeSpecifier(DeclSpec &DS) {
|
|
DS.SetRangeStart(Tok.getLocation());
|
|
const char *PrevSpec;
|
|
SourceLocation Loc = Tok.getLocation();
|
|
|
|
switch (Tok.getKind()) {
|
|
case tok::identifier: // foo::bar
|
|
case tok::coloncolon: // ::foo::bar
|
|
assert(0 && "Annotation token should already be formed!");
|
|
default:
|
|
assert(0 && "Not a simple-type-specifier token!");
|
|
abort();
|
|
|
|
// type-name
|
|
case tok::annot_typename: {
|
|
DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
|
|
Tok.getAnnotationValue());
|
|
break;
|
|
}
|
|
|
|
// builtin types
|
|
case tok::kw_short:
|
|
DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_long:
|
|
DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_signed:
|
|
DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_unsigned:
|
|
DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_void:
|
|
DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_char:
|
|
DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_int:
|
|
DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_float:
|
|
DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_double:
|
|
DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_wchar_t:
|
|
DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_char16_t:
|
|
DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_char32_t:
|
|
DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec);
|
|
break;
|
|
case tok::kw_bool:
|
|
DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec);
|
|
break;
|
|
|
|
// GNU typeof support.
|
|
case tok::kw_typeof:
|
|
ParseTypeofSpecifier(DS);
|
|
DS.Finish(Diags, PP);
|
|
return;
|
|
}
|
|
if (Tok.is(tok::annot_typename))
|
|
DS.SetRangeEnd(Tok.getAnnotationEndLoc());
|
|
else
|
|
DS.SetRangeEnd(Tok.getLocation());
|
|
ConsumeToken();
|
|
DS.Finish(Diags, PP);
|
|
}
|
|
|
|
/// ParseCXXTypeSpecifierSeq - Parse a C++ type-specifier-seq (C++
|
|
/// [dcl.name]), which is a non-empty sequence of type-specifiers,
|
|
/// e.g., "const short int". Note that the DeclSpec is *not* finished
|
|
/// by parsing the type-specifier-seq, because these sequences are
|
|
/// typically followed by some form of declarator. Returns true and
|
|
/// emits diagnostics if this is not a type-specifier-seq, false
|
|
/// otherwise.
|
|
///
|
|
/// type-specifier-seq: [C++ 8.1]
|
|
/// type-specifier type-specifier-seq[opt]
|
|
///
|
|
bool Parser::ParseCXXTypeSpecifierSeq(DeclSpec &DS) {
|
|
DS.SetRangeStart(Tok.getLocation());
|
|
const char *PrevSpec = 0;
|
|
int isInvalid = 0;
|
|
|
|
// Parse one or more of the type specifiers.
|
|
if (!ParseOptionalTypeSpecifier(DS, isInvalid, PrevSpec)) {
|
|
Diag(Tok, diag::err_operator_missing_type_specifier);
|
|
return true;
|
|
}
|
|
|
|
while (ParseOptionalTypeSpecifier(DS, isInvalid, PrevSpec)) ;
|
|
|
|
return false;
|
|
}
|
|
|
|
/// TryParseOperatorFunctionId - Attempts to parse a C++ overloaded
|
|
/// operator name (C++ [over.oper]). If successful, returns the
|
|
/// predefined identifier that corresponds to that overloaded
|
|
/// operator. Otherwise, returns NULL and does not consume any tokens.
|
|
///
|
|
/// operator-function-id: [C++ 13.5]
|
|
/// 'operator' operator
|
|
///
|
|
/// operator: one of
|
|
/// new delete new[] delete[]
|
|
/// + - * / % ^ & | ~
|
|
/// ! = < > += -= *= /= %=
|
|
/// ^= &= |= << >> >>= <<= == !=
|
|
/// <= >= && || ++ -- , ->* ->
|
|
/// () []
|
|
OverloadedOperatorKind
|
|
Parser::TryParseOperatorFunctionId(SourceLocation *EndLoc) {
|
|
assert(Tok.is(tok::kw_operator) && "Expected 'operator' keyword");
|
|
SourceLocation Loc;
|
|
|
|
OverloadedOperatorKind Op = OO_None;
|
|
switch (NextToken().getKind()) {
|
|
case tok::kw_new:
|
|
ConsumeToken(); // 'operator'
|
|
Loc = ConsumeToken(); // 'new'
|
|
if (Tok.is(tok::l_square)) {
|
|
ConsumeBracket(); // '['
|
|
Loc = Tok.getLocation();
|
|
ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); // ']'
|
|
Op = OO_Array_New;
|
|
} else {
|
|
Op = OO_New;
|
|
}
|
|
if (EndLoc)
|
|
*EndLoc = Loc;
|
|
return Op;
|
|
|
|
case tok::kw_delete:
|
|
ConsumeToken(); // 'operator'
|
|
Loc = ConsumeToken(); // 'delete'
|
|
if (Tok.is(tok::l_square)) {
|
|
ConsumeBracket(); // '['
|
|
Loc = Tok.getLocation();
|
|
ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); // ']'
|
|
Op = OO_Array_Delete;
|
|
} else {
|
|
Op = OO_Delete;
|
|
}
|
|
if (EndLoc)
|
|
*EndLoc = Loc;
|
|
return Op;
|
|
|
|
#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
|
|
case tok::Token: Op = OO_##Name; break;
|
|
#define OVERLOADED_OPERATOR_MULTI(Name,Spelling,Unary,Binary,MemberOnly)
|
|
#include "clang/Basic/OperatorKinds.def"
|
|
|
|
case tok::l_paren:
|
|
ConsumeToken(); // 'operator'
|
|
ConsumeParen(); // '('
|
|
Loc = Tok.getLocation();
|
|
ExpectAndConsume(tok::r_paren, diag::err_expected_rparen); // ')'
|
|
if (EndLoc)
|
|
*EndLoc = Loc;
|
|
return OO_Call;
|
|
|
|
case tok::l_square:
|
|
ConsumeToken(); // 'operator'
|
|
ConsumeBracket(); // '['
|
|
Loc = Tok.getLocation();
|
|
ExpectAndConsume(tok::r_square, diag::err_expected_rsquare); // ']'
|
|
if (EndLoc)
|
|
*EndLoc = Loc;
|
|
return OO_Subscript;
|
|
|
|
default:
|
|
return OO_None;
|
|
}
|
|
|
|
ConsumeToken(); // 'operator'
|
|
Loc = ConsumeAnyToken(); // the operator itself
|
|
if (EndLoc)
|
|
*EndLoc = Loc;
|
|
return Op;
|
|
}
|
|
|
|
/// ParseConversionFunctionId - Parse a C++ conversion-function-id,
|
|
/// which expresses the name of a user-defined conversion operator
|
|
/// (C++ [class.conv.fct]p1). Returns the type that this operator is
|
|
/// specifying a conversion for, or NULL if there was an error.
|
|
///
|
|
/// conversion-function-id: [C++ 12.3.2]
|
|
/// operator conversion-type-id
|
|
///
|
|
/// conversion-type-id:
|
|
/// type-specifier-seq conversion-declarator[opt]
|
|
///
|
|
/// conversion-declarator:
|
|
/// ptr-operator conversion-declarator[opt]
|
|
Parser::TypeTy *Parser::ParseConversionFunctionId(SourceLocation *EndLoc) {
|
|
assert(Tok.is(tok::kw_operator) && "Expected 'operator' keyword");
|
|
ConsumeToken(); // 'operator'
|
|
|
|
// Parse the type-specifier-seq.
|
|
DeclSpec DS;
|
|
if (ParseCXXTypeSpecifierSeq(DS))
|
|
return 0;
|
|
|
|
// Parse the conversion-declarator, which is merely a sequence of
|
|
// ptr-operators.
|
|
Declarator D(DS, Declarator::TypeNameContext);
|
|
ParseDeclaratorInternal(D, /*DirectDeclParser=*/0);
|
|
if (EndLoc)
|
|
*EndLoc = D.getSourceRange().getEnd();
|
|
|
|
// Finish up the type.
|
|
Action::TypeResult Result = Actions.ActOnTypeName(CurScope, D);
|
|
if (Result.isInvalid())
|
|
return 0;
|
|
else
|
|
return Result.get();
|
|
}
|
|
|
|
/// ParseCXXNewExpression - Parse a C++ new-expression. New is used to allocate
|
|
/// memory in a typesafe manner and call constructors.
|
|
///
|
|
/// This method is called to parse the new expression after the optional :: has
|
|
/// been already parsed. If the :: was present, "UseGlobal" is true and "Start"
|
|
/// is its location. Otherwise, "Start" is the location of the 'new' token.
|
|
///
|
|
/// new-expression:
|
|
/// '::'[opt] 'new' new-placement[opt] new-type-id
|
|
/// new-initializer[opt]
|
|
/// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
|
|
/// new-initializer[opt]
|
|
///
|
|
/// new-placement:
|
|
/// '(' expression-list ')'
|
|
///
|
|
/// new-type-id:
|
|
/// type-specifier-seq new-declarator[opt]
|
|
///
|
|
/// new-declarator:
|
|
/// ptr-operator new-declarator[opt]
|
|
/// direct-new-declarator
|
|
///
|
|
/// new-initializer:
|
|
/// '(' expression-list[opt] ')'
|
|
/// [C++0x] braced-init-list [TODO]
|
|
///
|
|
Parser::OwningExprResult
|
|
Parser::ParseCXXNewExpression(bool UseGlobal, SourceLocation Start) {
|
|
assert(Tok.is(tok::kw_new) && "expected 'new' token");
|
|
ConsumeToken(); // Consume 'new'
|
|
|
|
// A '(' now can be a new-placement or the '(' wrapping the type-id in the
|
|
// second form of new-expression. It can't be a new-type-id.
|
|
|
|
ExprVector PlacementArgs(Actions);
|
|
SourceLocation PlacementLParen, PlacementRParen;
|
|
|
|
bool ParenTypeId;
|
|
DeclSpec DS;
|
|
Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
|
|
if (Tok.is(tok::l_paren)) {
|
|
// If it turns out to be a placement, we change the type location.
|
|
PlacementLParen = ConsumeParen();
|
|
if (ParseExpressionListOrTypeId(PlacementArgs, DeclaratorInfo)) {
|
|
SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true);
|
|
return ExprError();
|
|
}
|
|
|
|
PlacementRParen = MatchRHSPunctuation(tok::r_paren, PlacementLParen);
|
|
if (PlacementRParen.isInvalid()) {
|
|
SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true);
|
|
return ExprError();
|
|
}
|
|
|
|
if (PlacementArgs.empty()) {
|
|
// Reset the placement locations. There was no placement.
|
|
PlacementLParen = PlacementRParen = SourceLocation();
|
|
ParenTypeId = true;
|
|
} else {
|
|
// We still need the type.
|
|
if (Tok.is(tok::l_paren)) {
|
|
SourceLocation LParen = ConsumeParen();
|
|
ParseSpecifierQualifierList(DS);
|
|
DeclaratorInfo.SetSourceRange(DS.getSourceRange());
|
|
ParseDeclarator(DeclaratorInfo);
|
|
MatchRHSPunctuation(tok::r_paren, LParen);
|
|
ParenTypeId = true;
|
|
} else {
|
|
if (ParseCXXTypeSpecifierSeq(DS))
|
|
DeclaratorInfo.setInvalidType(true);
|
|
else {
|
|
DeclaratorInfo.SetSourceRange(DS.getSourceRange());
|
|
ParseDeclaratorInternal(DeclaratorInfo,
|
|
&Parser::ParseDirectNewDeclarator);
|
|
}
|
|
ParenTypeId = false;
|
|
}
|
|
}
|
|
} else {
|
|
// A new-type-id is a simplified type-id, where essentially the
|
|
// direct-declarator is replaced by a direct-new-declarator.
|
|
if (ParseCXXTypeSpecifierSeq(DS))
|
|
DeclaratorInfo.setInvalidType(true);
|
|
else {
|
|
DeclaratorInfo.SetSourceRange(DS.getSourceRange());
|
|
ParseDeclaratorInternal(DeclaratorInfo,
|
|
&Parser::ParseDirectNewDeclarator);
|
|
}
|
|
ParenTypeId = false;
|
|
}
|
|
if (DeclaratorInfo.isInvalidType()) {
|
|
SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true);
|
|
return ExprError();
|
|
}
|
|
|
|
ExprVector ConstructorArgs(Actions);
|
|
SourceLocation ConstructorLParen, ConstructorRParen;
|
|
|
|
if (Tok.is(tok::l_paren)) {
|
|
ConstructorLParen = ConsumeParen();
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
CommaLocsTy CommaLocs;
|
|
if (ParseExpressionList(ConstructorArgs, CommaLocs)) {
|
|
SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true);
|
|
return ExprError();
|
|
}
|
|
}
|
|
ConstructorRParen = MatchRHSPunctuation(tok::r_paren, ConstructorLParen);
|
|
if (ConstructorRParen.isInvalid()) {
|
|
SkipUntil(tok::semi, /*StopAtSemi=*/true, /*DontConsume=*/true);
|
|
return ExprError();
|
|
}
|
|
}
|
|
|
|
return Actions.ActOnCXXNew(Start, UseGlobal, PlacementLParen,
|
|
move_arg(PlacementArgs), PlacementRParen,
|
|
ParenTypeId, DeclaratorInfo, ConstructorLParen,
|
|
move_arg(ConstructorArgs), ConstructorRParen);
|
|
}
|
|
|
|
/// ParseDirectNewDeclarator - Parses a direct-new-declarator. Intended to be
|
|
/// passed to ParseDeclaratorInternal.
|
|
///
|
|
/// direct-new-declarator:
|
|
/// '[' expression ']'
|
|
/// direct-new-declarator '[' constant-expression ']'
|
|
///
|
|
void Parser::ParseDirectNewDeclarator(Declarator &D) {
|
|
// Parse the array dimensions.
|
|
bool first = true;
|
|
while (Tok.is(tok::l_square)) {
|
|
SourceLocation LLoc = ConsumeBracket();
|
|
OwningExprResult Size(first ? ParseExpression()
|
|
: ParseConstantExpression());
|
|
if (Size.isInvalid()) {
|
|
// Recover
|
|
SkipUntil(tok::r_square);
|
|
return;
|
|
}
|
|
first = false;
|
|
|
|
SourceLocation RLoc = MatchRHSPunctuation(tok::r_square, LLoc);
|
|
D.AddTypeInfo(DeclaratorChunk::getArray(0, /*static=*/false, /*star=*/false,
|
|
Size.release(), LLoc, RLoc),
|
|
RLoc);
|
|
|
|
if (RLoc.isInvalid())
|
|
return;
|
|
}
|
|
}
|
|
|
|
/// ParseExpressionListOrTypeId - Parse either an expression-list or a type-id.
|
|
/// This ambiguity appears in the syntax of the C++ new operator.
|
|
///
|
|
/// new-expression:
|
|
/// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
|
|
/// new-initializer[opt]
|
|
///
|
|
/// new-placement:
|
|
/// '(' expression-list ')'
|
|
///
|
|
bool Parser::ParseExpressionListOrTypeId(ExprListTy &PlacementArgs,
|
|
Declarator &D) {
|
|
// The '(' was already consumed.
|
|
if (isTypeIdInParens()) {
|
|
ParseSpecifierQualifierList(D.getMutableDeclSpec());
|
|
D.SetSourceRange(D.getDeclSpec().getSourceRange());
|
|
ParseDeclarator(D);
|
|
return D.isInvalidType();
|
|
}
|
|
|
|
// It's not a type, it has to be an expression list.
|
|
// Discard the comma locations - ActOnCXXNew has enough parameters.
|
|
CommaLocsTy CommaLocs;
|
|
return ParseExpressionList(PlacementArgs, CommaLocs);
|
|
}
|
|
|
|
/// ParseCXXDeleteExpression - Parse a C++ delete-expression. Delete is used
|
|
/// to free memory allocated by new.
|
|
///
|
|
/// This method is called to parse the 'delete' expression after the optional
|
|
/// '::' has been already parsed. If the '::' was present, "UseGlobal" is true
|
|
/// and "Start" is its location. Otherwise, "Start" is the location of the
|
|
/// 'delete' token.
|
|
///
|
|
/// delete-expression:
|
|
/// '::'[opt] 'delete' cast-expression
|
|
/// '::'[opt] 'delete' '[' ']' cast-expression
|
|
Parser::OwningExprResult
|
|
Parser::ParseCXXDeleteExpression(bool UseGlobal, SourceLocation Start) {
|
|
assert(Tok.is(tok::kw_delete) && "Expected 'delete' keyword");
|
|
ConsumeToken(); // Consume 'delete'
|
|
|
|
// Array delete?
|
|
bool ArrayDelete = false;
|
|
if (Tok.is(tok::l_square)) {
|
|
ArrayDelete = true;
|
|
SourceLocation LHS = ConsumeBracket();
|
|
SourceLocation RHS = MatchRHSPunctuation(tok::r_square, LHS);
|
|
if (RHS.isInvalid())
|
|
return ExprError();
|
|
}
|
|
|
|
OwningExprResult Operand(ParseCastExpression(false));
|
|
if (Operand.isInvalid())
|
|
return move(Operand);
|
|
|
|
return Actions.ActOnCXXDelete(Start, UseGlobal, ArrayDelete, move(Operand));
|
|
}
|
|
|
|
static UnaryTypeTrait UnaryTypeTraitFromTokKind(tok::TokenKind kind)
|
|
{
|
|
switch(kind) {
|
|
default: assert(false && "Not a known unary type trait.");
|
|
case tok::kw___has_nothrow_assign: return UTT_HasNothrowAssign;
|
|
case tok::kw___has_nothrow_copy: return UTT_HasNothrowCopy;
|
|
case tok::kw___has_nothrow_constructor: return UTT_HasNothrowConstructor;
|
|
case tok::kw___has_trivial_assign: return UTT_HasTrivialAssign;
|
|
case tok::kw___has_trivial_copy: return UTT_HasTrivialCopy;
|
|
case tok::kw___has_trivial_constructor: return UTT_HasTrivialConstructor;
|
|
case tok::kw___has_trivial_destructor: return UTT_HasTrivialDestructor;
|
|
case tok::kw___has_virtual_destructor: return UTT_HasVirtualDestructor;
|
|
case tok::kw___is_abstract: return UTT_IsAbstract;
|
|
case tok::kw___is_class: return UTT_IsClass;
|
|
case tok::kw___is_empty: return UTT_IsEmpty;
|
|
case tok::kw___is_enum: return UTT_IsEnum;
|
|
case tok::kw___is_pod: return UTT_IsPOD;
|
|
case tok::kw___is_polymorphic: return UTT_IsPolymorphic;
|
|
case tok::kw___is_union: return UTT_IsUnion;
|
|
}
|
|
}
|
|
|
|
/// ParseUnaryTypeTrait - Parse the built-in unary type-trait
|
|
/// pseudo-functions that allow implementation of the TR1/C++0x type traits
|
|
/// templates.
|
|
///
|
|
/// primary-expression:
|
|
/// [GNU] unary-type-trait '(' type-id ')'
|
|
///
|
|
Parser::OwningExprResult Parser::ParseUnaryTypeTrait()
|
|
{
|
|
UnaryTypeTrait UTT = UnaryTypeTraitFromTokKind(Tok.getKind());
|
|
SourceLocation Loc = ConsumeToken();
|
|
|
|
SourceLocation LParen = Tok.getLocation();
|
|
if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen))
|
|
return ExprError();
|
|
|
|
// FIXME: Error reporting absolutely sucks! If the this fails to parse a type
|
|
// there will be cryptic errors about mismatched parentheses and missing
|
|
// specifiers.
|
|
TypeResult Ty = ParseTypeName();
|
|
|
|
SourceLocation RParen = MatchRHSPunctuation(tok::r_paren, LParen);
|
|
|
|
if (Ty.isInvalid())
|
|
return ExprError();
|
|
|
|
return Actions.ActOnUnaryTypeTrait(UTT, Loc, LParen, Ty.get(), RParen);
|
|
}
|
|
|
|
/// ParseCXXAmbiguousParenExpression - We have parsed the left paren of a
|
|
/// parenthesized ambiguous type-id. This uses tentative parsing to disambiguate
|
|
/// based on the context past the parens.
|
|
Parser::OwningExprResult
|
|
Parser::ParseCXXAmbiguousParenExpression(ParenParseOption &ExprType,
|
|
TypeTy *&CastTy,
|
|
SourceLocation LParenLoc,
|
|
SourceLocation &RParenLoc) {
|
|
assert(getLang().CPlusPlus && "Should only be called for C++!");
|
|
assert(ExprType == CastExpr && "Compound literals are not ambiguous!");
|
|
assert(isTypeIdInParens() && "Not a type-id!");
|
|
|
|
OwningExprResult Result(Actions, true);
|
|
CastTy = 0;
|
|
|
|
// We need to disambiguate a very ugly part of the C++ syntax:
|
|
//
|
|
// (T())x; - type-id
|
|
// (T())*x; - type-id
|
|
// (T())/x; - expression
|
|
// (T()); - expression
|
|
//
|
|
// The bad news is that we cannot use the specialized tentative parser, since
|
|
// it can only verify that the thing inside the parens can be parsed as
|
|
// type-id, it is not useful for determining the context past the parens.
|
|
//
|
|
// The good news is that the parser can disambiguate this part without
|
|
// making any unnecessary Action calls.
|
|
//
|
|
// It uses a scheme similar to parsing inline methods. The parenthesized
|
|
// tokens are cached, the context that follows is determined (possibly by
|
|
// parsing a cast-expression), and then we re-introduce the cached tokens
|
|
// into the token stream and parse them appropriately.
|
|
|
|
ParenParseOption ParseAs;
|
|
CachedTokens Toks;
|
|
|
|
// Store the tokens of the parentheses. We will parse them after we determine
|
|
// the context that follows them.
|
|
if (!ConsumeAndStoreUntil(tok::r_paren, tok::unknown, Toks, tok::semi)) {
|
|
// We didn't find the ')' we expected.
|
|
MatchRHSPunctuation(tok::r_paren, LParenLoc);
|
|
return ExprError();
|
|
}
|
|
|
|
if (Tok.is(tok::l_brace)) {
|
|
ParseAs = CompoundLiteral;
|
|
} else {
|
|
bool NotCastExpr;
|
|
// FIXME: Special-case ++ and --: "(S())++;" is not a cast-expression
|
|
if (Tok.is(tok::l_paren) && NextToken().is(tok::r_paren)) {
|
|
NotCastExpr = true;
|
|
} else {
|
|
// Try parsing the cast-expression that may follow.
|
|
// If it is not a cast-expression, NotCastExpr will be true and no token
|
|
// will be consumed.
|
|
Result = ParseCastExpression(false/*isUnaryExpression*/,
|
|
false/*isAddressofOperand*/,
|
|
NotCastExpr);
|
|
}
|
|
|
|
// If we parsed a cast-expression, it's really a type-id, otherwise it's
|
|
// an expression.
|
|
ParseAs = NotCastExpr ? SimpleExpr : CastExpr;
|
|
}
|
|
|
|
// The current token should go after the cached tokens.
|
|
Toks.push_back(Tok);
|
|
// Re-enter the stored parenthesized tokens into the token stream, so we may
|
|
// parse them now.
|
|
PP.EnterTokenStream(Toks.data(), Toks.size(),
|
|
true/*DisableMacroExpansion*/, false/*OwnsTokens*/);
|
|
// Drop the current token and bring the first cached one. It's the same token
|
|
// as when we entered this function.
|
|
ConsumeAnyToken();
|
|
|
|
if (ParseAs >= CompoundLiteral) {
|
|
TypeResult Ty = ParseTypeName();
|
|
|
|
// Match the ')'.
|
|
if (Tok.is(tok::r_paren))
|
|
RParenLoc = ConsumeParen();
|
|
else
|
|
MatchRHSPunctuation(tok::r_paren, LParenLoc);
|
|
|
|
if (ParseAs == CompoundLiteral) {
|
|
ExprType = CompoundLiteral;
|
|
return ParseCompoundLiteralExpression(Ty.get(), LParenLoc, RParenLoc);
|
|
}
|
|
|
|
// We parsed '(' type-id ')' and the thing after it wasn't a '{'.
|
|
assert(ParseAs == CastExpr);
|
|
|
|
if (Ty.isInvalid())
|
|
return ExprError();
|
|
|
|
CastTy = Ty.get();
|
|
|
|
// Result is what ParseCastExpression returned earlier.
|
|
if (!Result.isInvalid())
|
|
Result = Actions.ActOnCastExpr(LParenLoc, CastTy, RParenLoc,move(Result));
|
|
return move(Result);
|
|
}
|
|
|
|
// Not a compound literal, and not followed by a cast-expression.
|
|
assert(ParseAs == SimpleExpr);
|
|
|
|
ExprType = SimpleExpr;
|
|
Result = ParseExpression();
|
|
if (!Result.isInvalid() && Tok.is(tok::r_paren))
|
|
Result = Actions.ActOnParenExpr(LParenLoc, Tok.getLocation(), move(Result));
|
|
|
|
// Match the ')'.
|
|
if (Result.isInvalid()) {
|
|
SkipUntil(tok::r_paren);
|
|
return ExprError();
|
|
}
|
|
|
|
if (Tok.is(tok::r_paren))
|
|
RParenLoc = ConsumeParen();
|
|
else
|
|
MatchRHSPunctuation(tok::r_paren, LParenLoc);
|
|
|
|
return move(Result);
|
|
}
|