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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms and
** conditions see http://www.qt.io/terms-conditions. For further information
** use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#include "TypeResolver.h"
#include "Overview.h"
#include "TypeOfExpression.h"
#include <QDebug>
static const bool debug = ! qgetenv("QTC_LOOKUPCONTEXT_DEBUG").isEmpty();
namespace CPlusPlus {
namespace {
class DeduceAutoCheck : public ASTVisitor
{
public:
DeduceAutoCheck(const Identifier *id, TranslationUnit *tu)
: ASTVisitor(tu), _id(id), _block(false)
{
accept(tu->ast());
}
virtual bool preVisit(AST *)
{
if (_block)
return false;
return true;
}
virtual bool visit(SimpleNameAST *ast)
{
if (ast->name
&& ast->name->identifier()
&& strcmp(ast->name->identifier()->chars(), _id->chars()) == 0) {
_block = true;
}
return false;
}
virtual bool visit(MemberAccessAST *ast)
{
accept(ast->base_expression);
return false;
}
const Identifier *_id;
bool _block;
};
} // namespace anonymous
void TypeResolver::resolve(FullySpecifiedType *type, Scope **scope, LookupScope *binding)
{
QSet<Symbol *> visited;
_binding = binding;
// Use a hard limit when trying to resolve typedefs. Typedefs in templates can refer to
// each other, each time enhancing the template argument and thus making it impossible to
// use an "alreadyResolved" container. FIXME: We might overcome this by resolving the
// template parameters.
unsigned maxDepth = 15;
Overview oo;
if (Q_UNLIKELY(debug))
qDebug() << "- before typedef resolving we have:" << oo(*type);
for (NamedType *namedTy = 0; maxDepth && (namedTy = getNamedType(*type)); --maxDepth) {
QList<LookupItem> namedTypeItems = getNamedTypeItems(namedTy->name(), *scope, _binding);
if (Q_UNLIKELY(debug))
qDebug() << "-- we have" << namedTypeItems.size() << "candidates";
if (!findTypedef(namedTypeItems, type, scope, visited))
break;
}
if (Q_UNLIKELY(debug))
qDebug() << "- after typedef resolving:" << oo(*type);
}
NamedType *TypeResolver::getNamedType(FullySpecifiedType &type) const
{
NamedType *namedTy = type->asNamedType();
if (! namedTy) {
if (PointerType *pointerTy = type->asPointerType())
namedTy = pointerTy->elementType()->asNamedType();
}
return namedTy;
}
QList<LookupItem> TypeResolver::getNamedTypeItems(const Name *name, Scope *scope,
LookupScope *binding) const
{
QList<LookupItem> namedTypeItems = typedefsFromScopeUpToFunctionScope(name, scope);
if (namedTypeItems.isEmpty()) {
if (binding)
namedTypeItems = binding->lookup(name);
if (LookupScope *scopeCon = _factory.lookupType(scope)) {
if (scopeCon != binding)
namedTypeItems += scopeCon->lookup(name);
}
}
return namedTypeItems;
}
/// Return all typedefs with given name from given scope up to function scope.
QList<LookupItem> TypeResolver::typedefsFromScopeUpToFunctionScope(const Name *name, Scope *scope)
{
QList<LookupItem> results;
if (!scope)
return results;
Scope *enclosingBlockScope = 0;
for (Block *block = scope->asBlock(); block;
block = enclosingBlockScope ? enclosingBlockScope->asBlock() : 0) {
const unsigned memberCount = block->memberCount();
for (unsigned i = 0; i < memberCount; ++i) {
Symbol *symbol = block->memberAt(i);
if (Declaration *declaration = symbol->asDeclaration()) {
if (isTypedefWithName(declaration, name)) {
LookupItem item;
item.setDeclaration(declaration);
item.setScope(block);
item.setType(declaration->type());
results.append(item);
}
}
}
enclosingBlockScope = block->enclosingScope();
}
return results;
}
// Resolves auto and decltype initializer string
QList<LookupItem> TypeResolver::resolveDeclInitializer(
CreateBindings &factory, const Declaration *decl,
const QSet<const Declaration* > &declarationsBeingResolved,
const Identifier *id)
{
const StringLiteral *initializationString = decl->getInitializer();
if (initializationString == 0)
return QList<LookupItem>();
const QByteArray &initializer =
QByteArray::fromRawData(initializationString->chars(),
initializationString->size()).trimmed();
// Skip lambda-function initializers
if (initializer.length() > 0 && initializer[0] == '[')
return QList<LookupItem>();
TypeOfExpression exprTyper;
exprTyper.setExpandTemplates(true);
Document::Ptr doc = factory.snapshot().document(QString::fromLocal8Bit(decl->fileName()));
exprTyper.init(doc, factory.snapshot(), factory.sharedFromThis(), declarationsBeingResolved);
Document::Ptr exprDoc =
documentForExpression(exprTyper.preprocessedExpression(initializer));
factory.addExpressionDocument(exprDoc);
exprDoc->check();
if (id) {
DeduceAutoCheck deduceAuto(id, exprDoc->translationUnit());
if (deduceAuto._block)
return QList<LookupItem>();
}
return exprTyper(extractExpressionAST(exprDoc), exprDoc, decl->enclosingScope());
}
bool TypeResolver::isTypedefWithName(const Declaration *declaration, const Name *name)
{
if (declaration->isTypedef()) {
const Identifier *identifier = declaration->name()->identifier();
if (name->identifier()->match(identifier))
return true;
}
return false;
}
bool TypeResolver::findTypedef(const QList<LookupItem> &namedTypeItems, FullySpecifiedType *type,
Scope **scope, QSet<Symbol *> &visited)
{
foreach (const LookupItem &it, namedTypeItems) {
Symbol *declaration = it.declaration();
if (!declaration || (!declaration->isTypedef() && !declaration->type().isDecltype()))
continue;
if (visited.contains(declaration))
break;
visited.insert(declaration);
// continue working with the typedefed type and scope
if (type->type()->isPointerType()) {
*type = FullySpecifiedType(
_factory.control()->pointerType(declaration->type()));
} else if (type->type()->isReferenceType()) {
*type = FullySpecifiedType(
_factory.control()->referenceType(
declaration->type(),
declaration->type()->asReferenceType()->isRvalueReference()));
} else if (declaration->type().isDecltype()) {
Declaration *decl = declaration->asDeclaration();
const QList<LookupItem> resolved =
resolveDeclInitializer(_factory, decl, QSet<const Declaration* >() << decl);
if (!resolved.isEmpty()) {
LookupItem item = resolved.first();
*type = item.type();
*scope = item.scope();
_binding = item.binding();
return true;
}
} else {
*type = declaration->type();
}
*scope = it.scope();
_binding = it.binding();
return true;
}
return false;
}
} // namespace CPlusPlus
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