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/*
Title: save_vec.h - The save vector holds temporary values that may move as
the result of a garbage collection.
Copyright (c) 2006, 2010 David C.J. Matthews
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef SAVE_VEC_H_DEFINED
#define SAVE_VEC_H_DEFINED
#include "globals.h" // For PolyWord
/* A handle is the address of an element of save_vec */
/* This element points at an element of the Poly heap */
/* The element is currently represented as a (PolyWord *) */
class SaveVecEntry {
public:
SaveVecEntry(PolyWord w): m_Handle(w) {}
SaveVecEntry(): m_Handle(PolyWord::FromUnsigned(0)) {} // Just used when initialising the vec
PolyWord Word() { return m_Handle; }
PolyObject *WordP() { return m_Handle.AsObjPtr(); }
private:
PolyWord m_Handle;
friend class SaveVec;
};
typedef SaveVecEntry *Handle;
#define DEREFWORD(_x) ((_x)->Word())
#define DEREFHANDLE(_x) ((_x)->WordP())
#define DEREFWORDHANDLE(_x) ((_x)->WordP())
#define DEREFBYTEHANDLE(_x) ((byte *)DEREFHANDLE(_x))
#define DEREFLISTHANDLE(_x) ((ML_Cons_Cell *)DEREFHANDLE(_x))
#define DEREFSTREAMHANDLE(_x) ((StreamToken*)DEREFHANDLE(_x))
class ScanAddress;
class SaveVec
{
public:
SaveVec();
~SaveVec();
// Clear the save vec at the start of an RTS call
void init(void) { save_vec_addr = save_vec; }
// Add a word to the save vec
Handle push(PolyWord valu);
// Mark a position
Handle mark(void) { return save_vec_addr; }
// Reset to the mark
void reset(Handle mark);
bool isValidHandle(Handle h) { return h >= save_vec && h < save_vec_addr; } // Check it is in the range.
// Called by the garbage collector to scan and then update the addresses in the
// vector.
void gcScan(ScanAddress *process);
private:
SaveVecEntry *save_vec;
SaveVecEntry *save_vec_addr;
};
#endif
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