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