зеркало из https://github.com/microsoft/clang-1.git
107 строки
4.4 KiB
C++
107 строки
4.4 KiB
C++
//===--- SemaCXXScopeSpec.cpp - Semantic Analysis for C++ scope specifiers-===//
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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 C++ semantic analysis for scope specifiers.
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//
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//===----------------------------------------------------------------------===//
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#include "Sema.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/Parse/DeclSpec.h"
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#include "llvm/ADT/STLExtras.h"
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using namespace clang;
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/// ActOnCXXGlobalScopeSpecifier - Return the object that represents the
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/// global scope ('::').
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Sema::CXXScopeTy *Sema::ActOnCXXGlobalScopeSpecifier(Scope *S,
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SourceLocation CCLoc) {
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return cast<DeclContext>(Context.getTranslationUnitDecl());
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}
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/// ActOnCXXNestedNameSpecifier - Called during parsing of a
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/// nested-name-specifier. e.g. for "foo::bar::" we parsed "foo::" and now
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/// we want to resolve "bar::". 'SS' is empty or the previously parsed
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/// nested-name part ("foo::"), 'IdLoc' is the source location of 'bar',
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/// 'CCLoc' is the location of '::' and 'II' is the identifier for 'bar'.
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/// Returns a CXXScopeTy* object representing the C++ scope.
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Sema::CXXScopeTy *Sema::ActOnCXXNestedNameSpecifier(Scope *S,
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const CXXScopeSpec &SS,
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SourceLocation IdLoc,
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SourceLocation CCLoc,
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IdentifierInfo &II) {
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Decl *SD = LookupParsedName(S, &SS, &II, LookupNestedNameSpecifierName);
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if (SD) {
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if (TypedefDecl *TD = dyn_cast<TypedefDecl>(SD)) {
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if (const RecordType* Record = TD->getUnderlyingType()->getAsRecordType())
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return cast<DeclContext>(Record->getDecl());
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} else if (isa<NamespaceDecl>(SD) || isa<RecordDecl>(SD)) {
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return cast<DeclContext>(SD);
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}
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// FIXME: Template parameters and dependent types.
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// FIXME: C++0x scoped enums
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// Fall through to produce an error: we found something that isn't
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// a class or a namespace.
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}
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// If we didn't find anything during our lookup, try again with
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// ordinary name lookup, which can help us produce better error
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// messages.
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if (!SD)
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SD = LookupParsedName(S, &SS, &II, LookupOrdinaryName);
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unsigned DiagID;
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if (SD)
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DiagID = diag::err_expected_class_or_namespace;
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else if (SS.isSet())
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DiagID = diag::err_typecheck_no_member;
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else
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DiagID = diag::err_undeclared_var_use;
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if (SS.isSet())
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Diag(IdLoc, DiagID) << &II << SS.getRange();
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else
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Diag(IdLoc, DiagID) << &II;
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return 0;
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}
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/// ActOnCXXEnterDeclaratorScope - Called when a C++ scope specifier (global
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/// scope or nested-name-specifier) is parsed, part of a declarator-id.
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/// After this method is called, according to [C++ 3.4.3p3], names should be
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/// looked up in the declarator-id's scope, until the declarator is parsed and
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/// ActOnCXXExitDeclaratorScope is called.
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/// The 'SS' should be a non-empty valid CXXScopeSpec.
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void Sema::ActOnCXXEnterDeclaratorScope(Scope *S, const CXXScopeSpec &SS) {
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assert(SS.isSet() && "Parser passed invalid CXXScopeSpec.");
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assert(PreDeclaratorDC == 0 && "Previous declarator context not popped?");
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PreDeclaratorDC = static_cast<DeclContext*>(S->getEntity());
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CurContext = static_cast<DeclContext*>(SS.getScopeRep());
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S->setEntity(CurContext);
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}
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/// ActOnCXXExitDeclaratorScope - Called when a declarator that previously
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/// invoked ActOnCXXEnterDeclaratorScope(), is finished. 'SS' is the same
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/// CXXScopeSpec that was passed to ActOnCXXEnterDeclaratorScope as well.
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/// Used to indicate that names should revert to being looked up in the
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/// defining scope.
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void Sema::ActOnCXXExitDeclaratorScope(Scope *S, const CXXScopeSpec &SS) {
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assert(SS.isSet() && "Parser passed invalid CXXScopeSpec.");
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assert(S->getEntity() == SS.getScopeRep() && "Context imbalance!");
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S->setEntity(PreDeclaratorDC);
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PreDeclaratorDC = 0;
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// Reset CurContext to the nearest enclosing context.
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while (!S->getEntity() && S->getParent())
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S = S->getParent();
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CurContext = static_cast<DeclContext*>(S->getEntity());
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}
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