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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#ifndef SCI_ENGINE_GC_H
#define SCI_ENGINE_GC_H
#include "common/hashmap.h"
#include "sci/engine/vm_types.h"
#include "sci/engine/state.h"
namespace Sci {
struct reg_t_Hash {
uint operator()(const reg_t& x) const {
return (x.segment << 3) ^ x.offset ^ (x.offset << 16);
}
};
/*
* The AddrSet is a "set" of reg_t values.
* We don't have a HashSet type, so we abuse a HashMap for this.
*/
typedef Common::HashMap<reg_t, bool, reg_t_Hash> AddrSet;
/**
* Finds all used references and normalises them to their memory addresses
* @param s The state to gather all information from
* @return A hash map containing entries for all used references
*/
AddrSet *findAllActiveReferences(EngineState *s);
/**
* Runs garbage collection on the current system state
* @param s The state in which we should gc
*/
void run_gc(EngineState *s);
struct WorklistManager {
Common::Array<reg_t> _worklist;
AddrSet _map; // used for 2 contains() calls, inside push() and run_gc()
void push(reg_t reg);
void pushArray(const Common::Array<reg_t> &tmp);
};
} // End of namespace Sci
#endif // SCI_ENGINE_GC_H
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