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/*
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.com
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
The garbage collector for SuperCollider.
Based on Wilson and Johnstone's real time collector and the Baker treadmill.
*/
#ifndef _GC_
#define _GC_
#include "PyrObject.h"
#include "VMGlobals.h"
#include "AdvancingAllocPool.h"
void DumpSimpleBackTrace(VMGlobals *g);
const int kMaxPoolSet = 7;
const int kNumGCSizeClasses = 28;
const int kFinalizerSet = kNumGCSizeClasses;
const int kNumGCSets = kNumGCSizeClasses + 1;
class GCSet
{
public:
GCSet() {}
void Init(int inSizeClass);
bool HasFree() { return mFree != &mBlack; }
private:
friend class PyrGC;
void MoveWhiteToFree();
PyrObjectHdr mBlack;
PyrObjectHdr mWhite;
PyrObjectHdr* mFree;
};
struct SlotRef {
SlotRef(PyrObject* inObj, int32 inIndex) : obj(inObj), slotIndex(inIndex) {}
PyrObject *obj;
int32 slotIndex;
};
class PyrGC
{
public:
PyrGC(VMGlobals *g, AllocPool *inPool, PyrClass *mainProcessClass, long poolSize);
PyrObject* New(size_t inNumBytes, long inFlags, long inFormat, bool inCollect);
static PyrObject* NewPermanent(size_t inNumBytes,
long inFlags, long inFormat);
PyrObject* NewFinalizer(ObjFuncPtr finalizeFunc, PyrObject *inObject, bool inCollect);
int32 ProcessID() { return mProcessID; }
#if 0
// Codewarrior is not inlining these.. why?
bool IsBlack(PyrObjectHdr* inObj) { return inObj->gc_color == mBlackColor; }
bool IsWhite(PyrObjectHdr* inObj) { return inObj->gc_color == mWhiteColor; }
bool IsGrey(PyrObjectHdr* inObj) { return inObj->gc_color == mGreyColor; }
bool IsMarker(PyrObjectHdr* inObj) { return inObj->gc_color == obj_gcmarker; }
#else
#define IsBlack(inObj) ((inObj)->gc_color == mBlackColor)
#define IsWhite(inObj) ((inObj)->gc_color == mWhiteColor)
#define IsGrey(inObj) ((inObj)->gc_color == mGreyColor)
#define IsFree(inObj) (!(IsMarker(inObj) || inObj->IsPermanent() || \
IsBlack(inObj) || IsWhite(inObj) || IsGrey(inObj)))
#define IsMarker(inObj) ((inObj)->gc_color == obj_gcmarker)
#endif
bool ObjIsBlack(PyrObjectHdr* inObj) { return IsBlack(inObj); }
bool ObjIsGrey(PyrObjectHdr* inObj) { return IsGrey(inObj); }
bool ObjIsFree(PyrObjectHdr* inObj) { return IsFree(inObj); }
// general purpose write barriers:
void GCWrite(PyrObjectHdr* inParent, PyrSlot* inSlot)
{
if (IsBlack(inParent) && IsObj(inSlot) && IsWhite(inSlot->uo)) {
ToGrey(inSlot->uo);
}
}
void GCWrite(PyrObjectHdr* inParent, PyrObjectHdr* inChild)
{
if (IsBlack(inParent) && IsWhite(inChild)) {
ToGrey(inChild);
}
}
// when you know the parent is black:
void GCWriteBlack(PyrSlot* inSlot)
{
if (IsObj(inSlot)) {
if (IsWhite(inSlot->uo)) {
ToGrey(inSlot->uo);
}
}
}
void GCWriteBlack(PyrObjectHdr* inChild)
{
if (IsWhite(inChild)) {
ToGrey(inChild);
}
}
// when you know the child is white
void GCWriteNew(PyrObjectHdr* inParent, PyrObjectHdr* inChild)
{
if (IsBlack(inParent)) {
ToGrey(inChild);
}
}
// users should not call anything below.
void Collect();
void Collect(int32 inNumToScan);
void FullCollection();
void ScanFinalizers();
GCSet* GetGCSet(PyrObjectHdr* inObj);
void CompletePartialScan(PyrObject *obj);
void ToGrey(PyrObjectHdr* inObj);
void ToGrey2(PyrObjectHdr* inObj);
void ToBlack(PyrObjectHdr* inObj);
void ToWhite(PyrObjectHdr *obj);
int32 StackDepth() { return mVMGlobals->sp - mStack->slots + 1; }
PyrObject* Stack() { return mStack; }
void SetStack(PyrObject* inStack) { mStack = inStack; }
bool SanityCheck();
bool SanityCheck2();
bool LinkSanity();
bool ListSanity();
bool BlackToWhiteCheck(PyrObject *objA);
bool SanityMarkObj(PyrObject *objA, PyrObject *fromObj, int level);
bool SanityClearObj(PyrObject *objA, int level);
void DumpInfo();
void DumpEverything();
void BecomePermanent(PyrObject *inObject);
void BecomeImmutable(PyrObject *inObject);
private:
void Free(PyrObject* inObj);
void ScanSlots(PyrSlot *inSlots, long inNumToScan);
void SweepBigObjects();
void DoPartialScan(int32 inObjSize);
bool ScanOneObj();
void Flip();
void ScanStack();
void DLRemove(PyrObjectHdr *obj);
void DLInsertAfter(PyrObjectHdr *after, PyrObjectHdr *obj);
void DLInsertBefore(PyrObjectHdr *before, PyrObjectHdr *obj);
void ClearMarks();
void Finalize(PyrObject *obj);
VMGlobals *mVMGlobals;
AllocPool *mPool;
AdvancingAllocPool mNewPool;
GCSet mSets[kNumGCSets];
PyrProcess *mProcess; // the root is the pyrprocess which contains this struct
PyrObject *mStack;
PyrObject *mPartialScanObj;
PyrObjectHdr mGrey;
GCSet *mPartialScanSet;
int32 mPartialScanSlot;
int32 mNumToScan;
int32 mNumGrey;
int32 mCurSet;
int32 mFlips, mCollects, mAllocTotal, mScans, mNumAllocs;
unsigned char mBlackColor, mGreyColor, mWhiteColor, mFreeColor;
int8 mProcessID;
bool mCanSweep;
bool mRunning;
};
inline void PyrGC::DLRemove(PyrObjectHdr *obj)
{
obj->next->prev = obj->prev;
obj->prev->next = obj->next;
}
inline void PyrGC::DLInsertAfter(PyrObjectHdr *after, PyrObjectHdr *obj)
{
obj->next = after->next;
obj->prev = after;
after->next->prev = obj;
after->next = obj;
}
inline void PyrGC::DLInsertBefore(PyrObjectHdr *before, PyrObjectHdr *obj)
{
obj->prev = before->prev;
obj->next = before;
before->prev->next = obj;
before->prev = obj;
}
inline GCSet* PyrGC::GetGCSet(PyrObjectHdr* inObj)
{
return mSets + (inObj->classptr == class_finalizer ? kFinalizerSet : inObj->obj_sizeclass);
}
inline void PyrGC::ToBlack(PyrObjectHdr *obj)
{
if (IsGrey(obj)) {
mNumGrey--;
//post("ToBlack %d\n", mNumGrey);
}
DLRemove(obj);
GCSet *gcs = GetGCSet(obj);
DLInsertAfter(&gcs->mBlack, obj);
obj->gc_color = mBlackColor;
}
inline void PyrGC::ToWhite(PyrObjectHdr *obj)
{
if (IsGrey(obj)) {
mNumGrey--;
//post("ToWhite %d\n", mNumGrey);
}
DLRemove(obj);
GCSet *gcs = GetGCSet(obj);
DLInsertAfter(&gcs->mWhite, obj);
obj->gc_color = mWhiteColor;
}
#endif
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