Initial work on an AST dumper.

That will be pretty helpful to understand what's going wrong with
templates.

tests/manual/cplusplus-dump/main.cpp

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+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** 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 <AST.h>
+#include <ASTVisitor.h>
+#include <ASTPatternBuilder.h>
+#include <ASTMatcher.h>
+#include <Control.h>
+#include <Scope.h>
+#include <Semantic.h>
+#include <TranslationUnit.h>
+#include <Literals.h>
+#include <Symbols.h>
+#include <Names.h>
+#include <CoreTypes.h>
+#include <CppDocument.h>
+
+#include <QFile>
+#include <QList>
+#include <QCoreApplication>
+#include <QStringList>
+#include <QFileInfo>
+#include <QTime>
+#include <QtDebug>
+
+#include <cstdio>
+#include <cstdlib>
+#include <iostream>
+#include <cxxabi.h>
+
+using namespace CPlusPlus;
+
+class ASTDump: protected ASTVisitor
+{
+public:
+    ASTDump(TranslationUnit *unit)
+        : ASTVisitor(unit) {}
+
+    void operator()(AST *ast) {
+        std::cout << "digraph AST {" << std::endl;
+        accept(ast);
+        std::cout << "}" << std::endl;
+    }
+
+protected:
+    std::string name(AST *ast) const {
+        QByteArray name = abi::__cxa_demangle(typeid(*ast).name(), 0, 0, 0) + 11;
+        name.truncate(name.length() - 3);
+        name = QByteArray::number(_id.value(ast)) + ". " + name;
+        const char *x = spell(ast->firstToken());
+        name += ' ';
+        name += x;
+
+        name.prepend('"');
+        name.append('"');        
+
+        return std::string(name);
+    }
+
+    virtual bool preVisit(AST *ast) {
+        static int count = 1;
+        _id[ast] = count++;
+
+        if (! _stack.isEmpty())
+            std::cout << name(_stack.last()) << " -> " << name(ast) << ";" << std::endl;
+
+        _stack.append(ast);
+
+        return true;
+    }
+
+    virtual void postVisit(AST *ast) {
+        _stack.removeLast();        
+    }
+
+private:
+    QHash<AST *, int> _id;
+    QList<AST *> _stack;
+};
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication app(argc, argv);
+
+    QStringList files = app.arguments();
+    files.removeFirst();
+
+    foreach (const QString &fileName, files) {
+        QFile file(fileName);
+        if (! file.open(QFile::ReadOnly))
+            continue;
+
+        const QByteArray source = file.readAll();
+        file.close();
+
+        Document::Ptr doc = Document::create(fileName);
+        doc->control()->setDiagnosticClient(0);
+        doc->setSource(source);
+        doc->parse();
+
+        ASTDump dump(doc->translationUnit());
+        dump(doc->translationUnit()->ast());
+    }
+
+    return EXIT_SUCCESS;
+}