Introduced GLSL::Symbol.

src/libs/glsl/glsl-lib.pri

 HEADERS += $$PWD/glsl.h $$PWD/glsllexer.h $$PWD/glslparser.h $$PWD/glslparsertable_p.h $$PWD/glslast.h \
     $$PWD/glslastvisitor.h $$PWD/glslengine.h $$PWD/glslmemorypool.h $$PWD/glslastdump.h \
-    $$PWD/glslsemantic.h $$PWD/glsltype.h $$PWD/glsltypes.h
+    $$PWD/glslsemantic.h $$PWD/glsltype.h $$PWD/glsltypes.h $$PWD/glslsymbol.h
 SOURCES += $$PWD/glslkeywords.cpp $$PWD/glslparser.cpp $$PWD/glslparsertable.cpp \
     $$PWD/glsllexer.cpp $$PWD/glslast.cpp \
     $$PWD/glslastvisitor.cpp $$PWD/glslengine.cpp $$PWD/glslmemorypool.cpp $$PWD/glslastdump.cpp \
-    $$PWD/glslsemantic.cpp $$PWD/glsltype.cpp $$PWD/glsltypes.cpp
+    $$PWD/glslsemantic.cpp $$PWD/glsltype.cpp $$PWD/glsltypes.cpp $$PWD/glslsymbol.cpp
 
 OTHER_FILES = $$PWD/glsl.g

src/libs/glsl/glslsymbol.cpp

+/**************************************************************************
+**
+** 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 "glslsymbol.h"
+
+using namespace GLSL;
+
+Symbol::~Symbol()
+{
+}
+
+Scope::Scope(Scope *enclosingScope)
+    : _enclosingScope(enclosingScope)
+{
+}
+
+Scope *Scope::enclosingScope() const
+{
+    return _enclosingScope;
+}
+
+void Scope::setEnclosingScope(Scope *enclosingScope)
+{
+    _enclosingScope = enclosingScope;
+}
+
+Symbol *Scope::lookup(const QString &name) const
+{
+    if (Symbol *s = find(name))
+        return s;
+    else if (Scope *e = enclosingScope())
+        return e->lookup(name);
+    else
+        return 0;
+}

src/libs/glsl/glslsymbol.h

+/**************************************************************************
+**
+** 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.
+**
+**************************************************************************/
+
+#ifndef GLSLSYMBOL_H
+#define GLSLSYMBOL_H
+
+#include "glsl.h"
+
+namespace GLSL {
+
+class Symbol;
+class Scope;
+
+class Symbol
+{
+public:
+    virtual ~Symbol();
+
+    virtual Scope *asScope() { return 0; }
+
+    virtual Type *type() const = 0;
+};
+
+class Scope: public Symbol
+{
+public:
+    Scope(Scope *enclosingScope = 0);
+
+    Scope *enclosingScope() const;
+    void setEnclosingScope(Scope *enclosingScope);
+
+    Symbol *lookup(const QString &name) const;
+    virtual Symbol *find(const QString &name) const = 0;
+
+    virtual Scope *asScope() { return this; }
+
+private:
+    Scope *_enclosingScope;
+};
+
+} // end of namespace GLSL
+
+#endif // GLSLSYMBOL_H