/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is [Open Source Virtual Machine.].
 *
 * The Initial Developer of the Original Code is
 * Adobe System Incorporated.
 * Portions created by the Initial Developer are Copyright (C) 2004-2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Adobe AS3 Team
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */

#ifndef __avmplus_CodeContext__
#define __avmplus_CodeContext__

namespace avmplus
{
	const CodeContextAtom CONTEXT_NONE   = 0; // No CodeContext present
	const CodeContextAtom CONTEXT_ENV    = 0; // MethodEnv* pointer
	const CodeContextAtom CONTEXT_OBJECT = 1; // CodeContext* object

	// CodeContext is used to track which security context we are in.
	// When an AS3 method is called, the AS3 method will set core->codeContext to its code context.
	class CodeContext : public MMgc::GCFinalizedObject
	{
	public:		
#ifdef DEBUGGER
		virtual Toplevel *toplevel() const = 0;
#endif
	};

	class EnterCodeContext
	{
	public:
		EnterCodeContext(AvmCore * _core, MethodEnv *env)
		{
			initialize(_core, (CodeContextAtom)env | CONTEXT_ENV);
		}
		EnterCodeContext(AvmCore * _core, CodeContext *codeContext)
		{
			initialize(_core, (CodeContextAtom)codeContext | CONTEXT_OBJECT);
		}
		~EnterCodeContext()
		{
			finish();
		}
		void finish()
		{
			core->codeContextAtom = savedCodeContextAtom;
		}
	private:
		void initialize(AvmCore * _core, CodeContextAtom atom)
		{
			this->core = _core;
			savedCodeContextAtom = _core->codeContextAtom;
			_core->codeContextAtom = atom;
		}
		CodeContextAtom savedCodeContextAtom;
		AvmCore *core;
	};
}

#endif /* __avmplus_CodeContext__ */