FindUsages.cpp 58.6 KB
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/**************************************************************************
**
** This file is part of Qt Creator
**
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** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
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**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
**
**************************************************************************/

#include "FindUsages.h"
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#include "Overview.h"
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#include <AST.h>
#include <TranslationUnit.h>
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#include <Control.h>
#include <Names.h>
#include <Symbols.h>
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#include <CoreTypes.h>
#include <Literals.h>
#include <Scope.h>
#include <QDebug>
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using namespace CPlusPlus;

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FindUsages::FindUsages(Document::Ptr doc, const Snapshot &snapshot)
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    : ASTVisitor(doc->translationUnit()),
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      _id(0),
      _declSymbol(0),
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      _doc(doc),
      _snapshot(snapshot),
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      _context(doc, snapshot),
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      _source(_doc->source()),
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      _currentScope(0)
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{
    _snapshot.insert(_doc);
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    typeofExpression.init(_doc, _snapshot, _context.bindings());
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}

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FindUsages::FindUsages(const LookupContext &context)
    : ASTVisitor(context.thisDocument()->translationUnit()),
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      _id(0),
      _declSymbol(0),
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      _doc(context.thisDocument()),
      _snapshot(context.snapshot()),
      _context(context),
      _source(_doc->source()),
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      _currentScope(0)
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{
    typeofExpression.init(_doc, _snapshot, _context.bindings());
}

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QList<Usage> FindUsages::usages() const
{ return _usages; }

QList<int> FindUsages::references() const
{ return _references; }

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void FindUsages::operator()(Symbol *symbol)
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{
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    if (! symbol)
        return;

    _id = symbol->identifier();

    if (! _id)
        return;

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    _processed.clear();
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    _references.clear();
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    _usages.clear();
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    _declSymbol = symbol;
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    _declSymbolFullyQualifiedName = LookupContext::fullyQualifiedName(symbol);
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    // get the canonical id
    _id = _doc->control()->findOrInsertIdentifier(_id->chars(), _id->size());
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    if (AST *ast = _doc->translationUnit()->ast())
        translationUnit(ast->asTranslationUnit());
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}

QString FindUsages::matchingLine(const Token &tk) const
{
    const char *beg = _source.constData();
    const char *cp = beg + tk.offset;
    for (; cp != beg - 1; --cp) {
        if (*cp == '\n')
            break;
    }

    ++cp;

    const char *lineEnd = cp + 1;
    for (; *lineEnd; ++lineEnd) {
        if (*lineEnd == '\n')
            break;
    }

    const QString matchingLine = QString::fromUtf8(cp, lineEnd - cp);
    return matchingLine;
}

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void FindUsages::reportResult(unsigned tokenIndex, const Name *name, Scope *scope)
{
    if (! (tokenIndex && name != 0))
        return;

    if (name->identifier() != _id)
        return;

    if (! scope)
        scope = _currentScope;

    const QList<LookupItem> candidates = _context.lookup(name, scope);
    reportResult(tokenIndex, candidates);
}

void FindUsages::reportResult(unsigned tokenIndex, const Identifier *id, Scope *scope)
{
    reportResult(tokenIndex, control()->nameId(id), scope);
}

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void FindUsages::reportResult(unsigned tokenIndex, const QList<LookupItem> &candidates)
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{
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    if (_processed.contains(tokenIndex))
        return;

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    const bool isStrongResult = checkCandidates(candidates);

    if (isStrongResult)
        reportResult(tokenIndex);
}

void FindUsages::reportResult(unsigned tokenIndex)
{
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    const Token &tk = tokenAt(tokenIndex);
    if (tk.generated())
        return;
    else if (_processed.contains(tokenIndex))
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        return;

    _processed.insert(tokenIndex);

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    const QString lineText = matchingLine(tk);

    unsigned line, col;
    getTokenStartPosition(tokenIndex, &line, &col);

    if (col)
        --col;  // adjust the column position.

    const int len = tk.f.length;

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    const Usage u(_doc->fileName(), lineText, line, col, len);
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    _usages.append(u);
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    _references.append(tokenIndex);
}

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bool FindUsages::compareFullyQualifiedName(const QList<const Name *> &path, const QList<const Name *> &other)
{
    if (path.length() != other.length())
        return false;

    for (int i = 0; i < path.length(); ++i) {
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        if (! compareName(path.at(i), other.at(i)))
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            return false;
    }

    return true;
}

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bool FindUsages::compareName(const Name *name, const Name *other)
{
    if (name == other)
        return true;

    else if (name && other) {
        const Identifier *id = name->identifier();
        const Identifier *otherId = other->identifier();

        if (id == otherId || (id && id->isEqualTo(otherId)))
            return true;
    }

    return false;
}

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bool FindUsages::checkCandidates(const QList<LookupItem> &candidates) const
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{
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    for (int i = candidates.size() - 1; i != -1; --i) {
        const LookupItem &r = candidates.at(i);

        if (Symbol *s = r.declaration()) {
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            if (_declSymbol->scope() && (_declSymbol->scope()->isFunction() || _declSymbol->scope()->isBlock())) {
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                if (s->scope() != _declSymbol->scope())
                    return false;

            }

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            if (compareFullyQualifiedName(LookupContext::fullyQualifiedName(s), _declSymbolFullyQualifiedName))
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                return true;
        }
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    }

    return false;
}

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void FindUsages::checkExpression(unsigned startToken, unsigned endToken, Scope *scope)
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{
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    const unsigned begin = tokenAt(startToken).begin();
    const unsigned end = tokenAt(endToken).end();

    const QString expression = _source.mid(begin, end - begin);
    // qDebug() << "*** check expression:" << expression;

    if (! scope)
        scope = _currentScope;

    const QList<LookupItem> results = typeofExpression(expression, scope,
                                                       TypeOfExpression::Preprocess);

    reportResult(endToken, results);
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}

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Scope *FindUsages::switchScope(Scope *scope)
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{
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    if (! scope)
        return _currentScope;

    return switchScope(scope);
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}

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void FindUsages::statement(StatementAST *ast)
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{
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    accept(ast);
}
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void FindUsages::expression(ExpressionAST *ast)
{
    accept(ast);
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}

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void FindUsages::declaration(DeclarationAST *ast)
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{
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    accept(ast);
}

const Name *FindUsages::name(NameAST *ast)
{
    if (ast) {
        accept(ast);
        return ast->name;
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    }

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    return 0;
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}

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void FindUsages::specifier(SpecifierAST *ast)
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{
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    accept(ast);
}
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void FindUsages::ptrOperator(PtrOperatorAST *ast)
{
    accept(ast);
}
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void FindUsages::coreDeclarator(CoreDeclaratorAST *ast)
{
    accept(ast);
}
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void FindUsages::postfixDeclarator(PostfixDeclaratorAST *ast)
{
    accept(ast);
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}

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// AST
bool FindUsages::visit(ObjCSelectorArgumentAST *ast)
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{
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    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}
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void FindUsages::objCSelectorArgument(ObjCSelectorArgumentAST *ast)
{
    if (! ast)
        return;
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    // unsigned name_token = ast->name_token;
    // unsigned colon_token = ast->colon_token;
}
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bool FindUsages::visit(AttributeAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}
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void FindUsages::attribute(AttributeAST *ast)
{
    if (! ast)
        return;
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    // unsigned identifier_token = ast->identifier_token;
    // unsigned lparen_token = ast->lparen_token;
    // unsigned tag_token = ast->tag_token;
    for (ExpressionListAST *it = ast->expression_list; it; it = it->next) {
        this->expression(it->value);
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    }
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    // unsigned rparen_token = ast->rparen_token;
}
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bool FindUsages::visit(DeclaratorAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}
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void FindUsages::declarator(DeclaratorAST *ast, Scope *symbol)
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{
    if (! ast)
        return;
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    for (SpecifierListAST *it = ast->attribute_list; it; it = it->next) {
        this->specifier(it->value);
    }
    for (PtrOperatorListAST *it = ast->ptr_operator_list; it; it = it->next) {
        this->ptrOperator(it->value);
    }
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    Scope *previousScope = switchScope(symbol);

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    this->coreDeclarator(ast->core_declarator);
    for (PostfixDeclaratorListAST *it = ast->postfix_declarator_list; it; it = it->next) {
        this->postfixDeclarator(it->value);
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    }
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    for (SpecifierListAST *it = ast->post_attribute_list; it; it = it->next) {
        this->specifier(it->value);
    }
    // unsigned equals_token = ast->equals_token;
    this->expression(ast->initializer);
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    (void) switchScope(previousScope);
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}
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bool FindUsages::visit(QtPropertyDeclarationItemAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
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    return false;
}

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void FindUsages::qtPropertyDeclarationItem(QtPropertyDeclarationItemAST *ast)
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{
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    if (! ast)
        return;
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    // unsigned item_name_token = ast->item_name_token;
    this->expression(ast->expression);
}
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bool FindUsages::visit(QtInterfaceNameAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
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    return false;
}

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void FindUsages::qtInterfaceName(QtInterfaceNameAST *ast)
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{
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    if (! ast)
        return;

    /*const Name *interface_name =*/ this->name(ast->interface_name);
    for (NameListAST *it = ast->constraint_list; it; it = it->next) {
        /*const Name *value =*/ this->name(it->value);
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    }
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}
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bool FindUsages::visit(BaseSpecifierAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
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    return false;
}

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void FindUsages::baseSpecifier(BaseSpecifierAST *ast)
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{
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    if (! ast)
        return;
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    // unsigned virtual_token = ast->virtual_token;
    // unsigned access_specifier_token = ast->access_specifier_token;
    /*const Name *name =*/ this->name(ast->name);
    // BaseClass *symbol = ast->symbol;
}

bool FindUsages::visit(CtorInitializerAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
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    return false;
}

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void FindUsages::ctorInitializer(CtorInitializerAST *ast)
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{
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    if (! ast)
        return;
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    // unsigned colon_token = ast->colon_token;
    for (MemInitializerListAST *it = ast->member_initializer_list; it; it = it->next) {
        this->memInitializer(it->value);
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    }
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    // unsigned dot_dot_dot_token = ast->dot_dot_dot_token;
}
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bool FindUsages::visit(EnumeratorAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
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    return false;
}

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void FindUsages::enumerator(EnumeratorAST *ast)
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{
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    if (! ast)
        return;
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    // unsigned identifier_token = ast->identifier_token;
    reportResult(ast->identifier_token, identifier(ast->identifier_token));
    // unsigned equal_token = ast->equal_token;
    this->expression(ast->expression);
}
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bool FindUsages::visit(ExceptionSpecificationAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}
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void FindUsages::exceptionSpecification(ExceptionSpecificationAST *ast)
{
    if (! ast)
        return;
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    // unsigned throw_token = ast->throw_token;
    // unsigned lparen_token = ast->lparen_token;
    // unsigned dot_dot_dot_token = ast->dot_dot_dot_token;
    for (ExpressionListAST *it = ast->type_id_list; it; it = it->next) {
        this->expression(it->value);
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    }
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    // unsigned rparen_token = ast->rparen_token;
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}

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bool FindUsages::visit(MemInitializerAST *ast)
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{
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    (void) ast;
    Q_ASSERT(!"unreachable");
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    return false;
}

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void FindUsages::memInitializer(MemInitializerAST *ast)
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{
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    if (! ast)
        return;
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    if (_currentScope->isFunction()) {
        Class *classScope = _currentScope->enclosingClass();
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        if (! classScope) {
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            if (ClassOrNamespace *binding = _context.lookupType(_currentScope)) {
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                foreach (Symbol *s, binding->symbols()) {
                    if (Class *k = s->asClass()) {
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                        classScope = k;
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                        break;
                    }
                }
            }
        }
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        if (classScope) {
            Scope *previousScope = switchScope(classScope);
            /*const Name *name =*/ this->name(ast->name);
            (void) switchScope(previousScope);
        }
    }
    // unsigned lparen_token = ast->lparen_token;
    for (ExpressionListAST *it = ast->expression_list; it; it = it->next) {
        this->expression(it->value);
    }
    // unsigned rparen_token = ast->rparen_token;
}
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bool FindUsages::visit(NestedNameSpecifierAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
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    return false;
}

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void FindUsages::nestedNameSpecifier(NestedNameSpecifierAST *ast)
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{
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    if (! ast)
        return;
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    /*const Name *class_or_namespace_name =*/ this->name(ast->class_or_namespace_name);
    // unsigned scope_token = ast->scope_token;
}

bool FindUsages::visit(NewPlacementAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
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    return false;
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}

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void FindUsages::newPlacement(NewPlacementAST *ast)
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{
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    if (! ast)
        return;

    // unsigned lparen_token = ast->lparen_token;
    for (ExpressionListAST *it = ast->expression_list; it; it = it->next) {
        this->expression(it->value);
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    }
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    // unsigned rparen_token = ast->rparen_token;
}
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bool FindUsages::visit(NewArrayDeclaratorAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
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    return false;
}
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void FindUsages::newArrayDeclarator(NewArrayDeclaratorAST *ast)
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{
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    if (! ast)
        return;
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    // unsigned lbracket_token = ast->lbracket_token;
    this->expression(ast->expression);
    // unsigned rbracket_token = ast->rbracket_token;
}
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bool FindUsages::visit(NewInitializerAST *ast)
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{
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    (void) ast;
    Q_ASSERT(!"unreachable");
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    return false;
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}

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void FindUsages::newInitializer(NewInitializerAST *ast)
{
    if (! ast)
        return;

    // unsigned lparen_token = ast->lparen_token;
    this->expression(ast->expression);
    // unsigned rparen_token = ast->rparen_token;
}

bool FindUsages::visit(NewTypeIdAST *ast)
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{
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    (void) ast;
    Q_ASSERT(!"unreachable");
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    return false;
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}

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void FindUsages::newTypeId(NewTypeIdAST *ast)
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{
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    if (! ast)
        return;
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    for (SpecifierListAST *it = ast->type_specifier_list; it; it = it->next) {
        this->specifier(it->value);
    }
    for (PtrOperatorListAST *it = ast->ptr_operator_list; it; it = it->next) {
        this->ptrOperator(it->value);
    }
    for (NewArrayDeclaratorListAST *it = ast->new_array_declarator_list; it; it = it->next) {
        this->newArrayDeclarator(it->value);
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    }
}

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bool FindUsages::visit(OperatorAST *ast)
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{
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    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}
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void FindUsages::cppOperator(OperatorAST *ast)
{
    if (! ast)
        return;
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    // unsigned op_token = ast->op_token;
    // unsigned open_token = ast->open_token;
    // unsigned close_token = ast->close_token;
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}

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bool FindUsages::visit(ParameterDeclarationClauseAST *ast)
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{
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    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}
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void FindUsages::parameterDeclarationClause(ParameterDeclarationClauseAST *ast)
{
    if (! ast)
        return;
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    for (DeclarationListAST *it = ast->parameter_declaration_list; it; it = it->next) {
        this->declaration(it->value);
    }
    // unsigned dot_dot_dot_token = ast->dot_dot_dot_token;
}
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bool FindUsages::visit(TranslationUnitAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}
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void FindUsages::translationUnit(TranslationUnitAST *ast)
{
    if (! ast)
        return;
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    Scope *previousScope = switchScope(_doc->globalNamespace());
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    for (DeclarationListAST *it = ast->declaration_list; it; it = it->next) {
        this->declaration(it->value);
    }
    (void) switchScope(previousScope);
}
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bool FindUsages::visit(ObjCProtocolRefsAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}
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void FindUsages::objCProtocolRefs(ObjCProtocolRefsAST *ast)
{
    if (! ast)
        return;
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    // unsigned less_token = ast->less_token;
    for (NameListAST *it = ast->identifier_list; it; it = it->next) {
        /*const Name *value =*/ this->name(it->value);
    }
    // unsigned greater_token = ast->greater_token;
}
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bool FindUsages::visit(ObjCMessageArgumentAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}
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void FindUsages::objCMessageArgument(ObjCMessageArgumentAST *ast)
{
    if (! ast)
        return;
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    this->expression(ast->parameter_value_expression);
}
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bool FindUsages::visit(ObjCTypeNameAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
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}

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void FindUsages::objCTypeName(ObjCTypeNameAST *ast)
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{
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    if (! ast)
        return;

    // unsigned lparen_token = ast->lparen_token;
    // unsigned type_qualifier_token = ast->type_qualifier_token;
    this->expression(ast->type_id);
    // unsigned rparen_token = ast->rparen_token;
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}

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bool FindUsages::visit(ObjCInstanceVariablesDeclarationAST *ast)
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{
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    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
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}
719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543

void FindUsages::objCInstanceVariablesDeclaration(ObjCInstanceVariablesDeclarationAST *ast)
{
    if (! ast)
        return;

    // unsigned lbrace_token = ast->lbrace_token;
    for (DeclarationListAST *it = ast->instance_variable_list; it; it = it->next) {
        this->declaration(it->value);
    }
    // unsigned rbrace_token = ast->rbrace_token;
}

bool FindUsages::visit(ObjCPropertyAttributeAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}

void FindUsages::objCPropertyAttribute(ObjCPropertyAttributeAST *ast)
{
    if (! ast)
        return;

    // unsigned attribute_identifier_token = ast->attribute_identifier_token;
    // unsigned equals_token = ast->equals_token;
    /*const Name *method_selector =*/ this->name(ast->method_selector);
}

bool FindUsages::visit(ObjCMessageArgumentDeclarationAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}

void FindUsages::objCMessageArgumentDeclaration(ObjCMessageArgumentDeclarationAST *ast)
{
    if (! ast)
        return;

    this->objCTypeName(ast->type_name);
    for (SpecifierListAST *it = ast->attribute_list; it; it = it->next) {
        this->specifier(it->value);
    }
    /*const Name *param_name =*/ this->name(ast->param_name);
    // Argument *argument = ast->argument;
}

bool FindUsages::visit(ObjCMethodPrototypeAST *ast)
{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}

void FindUsages::objCMethodPrototype(ObjCMethodPrototypeAST *ast)
{
    if (! ast)
        return;

    // unsigned method_type_token = ast->method_type_token;
    this->objCTypeName(ast->type_name);
    /*const Name *selector =*/ this->name(ast->selector);
    Scope *previousScope = switchScope(ast->symbol);
    for (ObjCMessageArgumentDeclarationListAST *it = ast->argument_list; it; it = it->next) {
        this->objCMessageArgumentDeclaration(it->value);
    }
    //