FindUsages.cpp 62.6 KB
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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
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**
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** This file is part of Qt Creator.
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**
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** 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
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** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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****************************************************************************/
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#include "FindUsages.h"
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#include "Overview.h"
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#include <cplusplus/AST.h>
#include <cplusplus/TranslationUnit.h>
#include <cplusplus/Control.h>
#include <cplusplus/Names.h>
#include <cplusplus/Symbols.h>
#include <cplusplus/CoreTypes.h>
#include <cplusplus/Literals.h>
#include <cplusplus/Scope.h>

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#include <QDebug>
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using namespace CPlusPlus;

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FindUsages::FindUsages(const QByteArray &originalSource, Document::Ptr doc, const Snapshot &snapshot)
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    : ASTVisitor(doc->translationUnit()),
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      _doc(doc),
      _snapshot(snapshot),
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      _context(doc, snapshot),
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      _originalSource(originalSource),
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      _source(_doc->utf8Source())
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{
    _snapshot.insert(_doc);
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    typeofExpression.init(_doc, _snapshot, _context.bindings());
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    prepareLines(_originalSource);
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}

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FindUsages::FindUsages(const LookupContext &context)
    : ASTVisitor(context.thisDocument()->translationUnit()),
      _doc(context.thisDocument()),
      _snapshot(context.snapshot()),
      _context(context),
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      _originalSource(_doc->utf8Source()),
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      _source(_doc->utf8Source())
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{
    typeofExpression.init(_doc, _snapshot, _context.bindings());
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    prepareLines(_originalSource);
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}

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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
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    _id = _doc->control()->identifier(_id->chars(), _id->size());
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    if (AST *ast = _doc->translationUnit()->ast())
        translationUnit(ast->asTranslationUnit());
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}

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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)
{
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    reportResult(tokenIndex, static_cast<const Name *>(id), scope);
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}

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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);
}

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

    ++cp;

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

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

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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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    unsigned line, col;
    getTokenStartPosition(tokenIndex, &line, &col);
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    QString lineText;
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    if (line < _sourceLineEnds.size())
        lineText = fetchLine(line);
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    else
        lineText = matchingLine(tk);
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    if (col)
        --col;  // adjust the column position.

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    const int len = tk.utf16chars();
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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::isLocalScope(Scope *scope)
{
    if (scope) {
        if (scope->isBlock() || scope->isTemplate() || scope->isFunction())
            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->isTypenameArgument()) {
                if (s != _declSymbol)
                    return false;
            }

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            Scope *declEnclosingScope = _declSymbol->enclosingScope();
            Scope *enclosingScope = s->enclosingScope();
            if (isLocalScope(declEnclosingScope) || isLocalScope(enclosingScope)) {
                if (_declSymbol->isClass() && declEnclosingScope->isTemplate()
                        && s->isClass() && enclosingScope->isTemplate()) {
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                    // for definition of functions of class defined outside the class definition
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                    Scope *templEnclosingDeclSymbol = declEnclosingScope;
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                    Scope *scopeOfTemplEnclosingDeclSymbol
                            = templEnclosingDeclSymbol->enclosingScope();
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                    Scope *templEnclosingCandidateSymbol = enclosingScope;
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                    Scope *scopeOfTemplEnclosingCandidateSymbol
                            = templEnclosingCandidateSymbol->enclosingScope();

                    if (scopeOfTemplEnclosingCandidateSymbol != scopeOfTemplEnclosingDeclSymbol)
                        return false;
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                } else if (_declSymbol->isClass() && declEnclosingScope->isTemplate()
                        && enclosingScope->isClass()
                        && enclosingScope->enclosingScope()->isTemplate()) {
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                    // for declaration inside template class
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                    Scope *templEnclosingDeclSymbol = declEnclosingScope;
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                    Scope *scopeOfTemplEnclosingDeclSymbol
                            = templEnclosingDeclSymbol->enclosingScope();
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                    Scope *templEnclosingCandidateSymbol = enclosingScope->enclosingScope();
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                    Scope *scopeOfTemplEnclosingCandidateSymbol
                            = templEnclosingCandidateSymbol->enclosingScope();

                    if (scopeOfTemplEnclosingCandidateSymbol !=  scopeOfTemplEnclosingDeclSymbol)
                        return false;
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                } else if (enclosingScope->isTemplate() && ! _declSymbol->isTypenameArgument()) {
                    if (declEnclosingScope->isTemplate()) {
                        if (enclosingScope->enclosingScope() != declEnclosingScope->enclosingScope())
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                            return false;
                    } else {
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                        if (enclosingScope->enclosingScope() != declEnclosingScope)
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                            return false;
                    }
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                } else if (declEnclosingScope->isTemplate() && s->isTemplate()) {
                    if (declEnclosingScope->enclosingScope() != enclosingScope)
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                        return false;
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                } else if (! s->isUsingDeclaration()
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                           && enclosingScope != declEnclosingScope) {
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                    return false;
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                }
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            }

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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).bytesBegin();
    const unsigned end = tokenAt(endToken).bytesEnd();
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    const QByteArray expression = _source.mid(begin, end - begin);
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    // qDebug() << "*** check expression:" << expression;

    if (! scope)
        scope = _currentScope;

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    // make possible to instantiate templates
    typeofExpression.setExpandTemplates(true);
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    const QList<LookupItem> results = typeofExpression(expression, scope, TypeOfExpression::Preprocess);
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    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;

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    Scope *previousScope = _currentScope;
    _currentScope = scope;
    return previousScope;
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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(GnuAttributeAST *ast)
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{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}
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void FindUsages::attribute(GnuAttributeAST *ast)
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{
    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(DynamicExceptionSpecificationAST *ast)
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{
    (void) ast;
    Q_ASSERT(!"unreachable");
    return false;
}
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void FindUsages::exceptionSpecification(ExceptionSpecificationAST *ast)
{
    if (! ast)
        return;
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    if (DynamicExceptionSpecificationAST *dyn = ast->asDynamicExceptionSpecification()) {
        // 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 = dyn->type_id_list; it; it = it->next) {
            this->expression(it->value);
        }
        // unsigned rparen_token = ast->rparen_token;
    } else if (NoExceptSpecificationAST *no = ast->asNoExceptSpecification()) {
        this->expression(no->expression);
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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);
        }
    }
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    this->expression(ast->expression);
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}
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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;
}

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bool FindUsages::visit(ExpressionListParenAST *ast)
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{
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    // 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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    return false;
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}

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void FindUsages::newPlacement(ExpressionListParenAST *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(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 (ParameterDeclarationListAST *it = ast->parameter_declaration_list; it; it = it->next) {
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        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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}
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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);
    }
    // unsigned dot_dot_dot_token = ast->dot_dot_dot_token;
    for (SpecifierListAST *it = ast->attribute_list; it; it = it->next) {
        this->specifier(it->value);
    }
    // ObjCMethod *symbol = ast->symbol;
    (void) switchScope(previousScope);
}

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

void FindUsages::objCSynthesizedProperty(ObjCSynthesizedPropertyAST *ast)
{
    if (! ast)
        return;

    // unsigned property_identifier_token = ast->property_identifier_token;
    // unsigned equals_token = ast->equals_token;
    // unsigned alias_identifier_token = ast->alias_identifier_token;
}

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

void FindUsages::lambdaIntroducer(LambdaIntroducerAST *ast)
{
    if (! ast)
        return;

    // unsigned lbracket_token = ast->lbracket_token;
    this->lambdaCapture(ast->lambda_capture);
    // unsigned rbracket_token = ast->rbracket_token;
}

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

void FindUsages::lambdaCapture(LambdaCaptureAST *ast)
{
    if (! ast)
        return;

    // unsigned default_capture_token = ast->default_capture_token;
    for (CaptureListAST *it = ast->capture_list; it; it = it->next) {
        this->capture(it->value);
    }
}

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

void FindUsages::capture(CaptureAST *ast)
{
    if (! ast)
        return;

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    this->name(ast->identifier);
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}

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

void FindUsages::lambdaDeclarator(LambdaDeclaratorAST *ast)
{
    if (! ast)
        return;

    // unsigned lparen_token = ast->lparen_token;
    this->parameterDeclarationClause(ast->parameter_declaration_clause);
    // unsigned rparen_token = ast->rparen_token;
    for (SpecifierListAST *it = ast->attributes; it; it = it->next) {
        this->specifier(it->value);
    }
    // unsigned mutable_token = ast->mutable_token;
    this->exceptionSpecification(ast->exception_specification);
    this->trailingReturnType(ast->trailing_return_type);
}

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

void FindUsages::trailingReturnType(TrailingReturnTypeAST *ast)
{
    if (! ast)
        return;

    // unsigned arrow_token = ast->arrow_token;
    for (SpecifierListAST *it = ast->attributes; it; it = it->next) {
        this->specifier(it->value);
    }
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    for (SpecifierListAST *it = ast->type_specifier_list; it; it = it->next) {
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        this->specifier(it->value);
    }
    this->declarator(ast->declarator);
}


// StatementAST
bool FindUsages::visit(QtMemberDeclarationAST *ast)
{
    // unsigned q_token = ast->q_token;
    // unsigned lparen_token = ast->lparen_token;
    this->expression(ast->type_id);
    // unsigned rparen_token = ast->rparen_token;
    return false;
}

bool FindUsages::visit(CaseStatementAST *ast)
{
    // unsigned case_token = ast->case_token;
    this->expression(ast->expression);
    // unsigned colon_token = ast->colon_token;
    this->statement(ast->statement);
    return false;
}

bool FindUsages::visit(CompoundStatementAST *ast)
{
    // unsigned lbrace_token = ast->lbrace_token;
    Scope *previousScope = switchScope(ast->symbol);
    for (StatementListAST *it = ast->statement_list; it; it = it->next) {
        this->statement(it->value);
    }
    // unsigned rbrace_token = ast->rbrace_token;
    // Block *symbol = ast->symbol;
    (void) switchScope(previousScope);
    return false;
}

bool FindUsages::visit(DeclarationStatementAST *ast)
{
    this->declaration(ast->declaration);
    return false;
}

bool FindUsages::visit(DoStatementAST *ast)
{
    // unsigned do_token = ast->do_token;
    this->statement(ast->statement);
    // unsigned while_token = ast->while_token;
    // unsigned lparen_token = ast->lparen_token;
    this->expression(ast->expression);
    // unsigned rparen_token = ast->rparen_token;
    // unsigned semicolon_token = ast->semicolon_token;
    return false;
}

bool FindUsages::visit(ExpressionOrDeclarationStatementAST *ast)
{
    this->statement(ast->expression);
    this->statement(ast->declaration);
    return false;
}

bool FindUsages::visit(ExpressionStatementAST *ast)
{
    this->expression(ast->expression);
    // unsigned semicolon_token = ast->semicolon_token;
    return false;
}

bool FindUsages::visit(ForeachStatementAST *ast)
{
    // unsigned foreach_token = ast->foreach_token;
    // unsigned lparen_token = ast->lparen_token;
    Scope *previousScope = switchScope(ast->symbol);
    for (SpecifierListAST *it = ast->type_specifier_list; it; it = it->next) {
        this->specifier(it->value);
    }
    this->declarator(ast->declarator);
    this->expression(ast->initializer);
    // unsigned comma_token = ast->comma_token;
    this->expression(ast->expression);
    // unsigned rparen_token = ast->rparen_token;
    this->statement(ast->statement);
    // Block *symbol = ast->symbol;
    (void) switchScope(previousScope);
    return false;
}

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bool FindUsages::visit(RangeBasedForStatementAST *ast)
{
    Scope *previousScope = switchScope(ast->symbol);
    for (SpecifierListAST *it = ast->type_specifier_list; it; it = it->next) {
        this->specifier(it->value);
    }
    this->declarator(ast->declarator);
    // unsigned comma_token = ast->comma_token;
    this->expression(ast->expression);
    // unsigned rparen_token = ast->rparen_token;
    this->statement(ast->statement);
    // Block *symbol = ast->symbol;
    (void) switchScope(previousScope);
    return false;
}

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