зеркало из https://github.com/mozilla/gecko-dev.git
332 строки
13 KiB
C
332 строки
13 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape 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/NPL/
|
|
*
|
|
* 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 mozilla.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*/
|
|
|
|
/*******************************************************************************
|
|
S P O R T M O D E L
|
|
_____
|
|
____/_____\____
|
|
/__o____o____o__\ __
|
|
\_______________/ (@@)/
|
|
/\_____|_____/\ x~[]~
|
|
~~~~~~~~~~~/~~~~~~~|~~~~~~~\~~~~~~~~/\~~~~~~~~~
|
|
|
|
Advanced Technology Garbage Collector
|
|
Copyright (c) 1997 Netscape Communications, Inc. All rights reserved.
|
|
Recovered by: Warren Harris
|
|
*******************************************************************************/
|
|
|
|
#ifndef __SMHEAP__
|
|
#define __SMHEAP__
|
|
|
|
#include "sm.h"
|
|
#include "smgen.h"
|
|
#include "smstack.h"
|
|
#include "prthread.h"
|
|
#include "prmon.h"
|
|
|
|
SM_BEGIN_EXTERN_C
|
|
|
|
/*******************************************************************************
|
|
* Object Descriptors
|
|
******************************************************************************/
|
|
|
|
/* object is finalizable -- flag used both inside and outside of gc */
|
|
|
|
#define SM_OBJDESC_FINALIZABLE_MASK (1 << SMObjectDescFlag_FinalizableBit)
|
|
|
|
#define SM_OBJDESC_IS_FINALIZABLE(od) \
|
|
((od)->flags & SM_OBJDESC_FINALIZABLE_MASK) \
|
|
|
|
#define SM_OBJDESC_SET_FINALIZABLE(od) \
|
|
(SM_ASSERT(!SM_OBJDESC_IS_FREE(od)), \
|
|
(od)->flags |= SM_OBJDESC_FINALIZABLE_MASK) \
|
|
|
|
/******************************************************************************/
|
|
|
|
/* object is otherwise free but needs finalization */
|
|
|
|
#define SM_OBJDESC_NEEDS_FINALIZATION_MASK \
|
|
(1 << SMObjectDescFlag_NeedsFinalizationBit) \
|
|
|
|
#define SM_OBJDESC_NEEDS_FINALIZATION(od) \
|
|
((od)->flags & SM_OBJDESC_NEEDS_FINALIZATION_MASK) \
|
|
|
|
#define SM_OBJDESC_SET_NEEDS_FINALIZATION(od) \
|
|
((od)->flags |= SM_OBJDESC_NEEDS_FINALIZATION_MASK) \
|
|
|
|
#define SM_OBJDESC_CLEAR_FINALIZATION(od) \
|
|
((od)->flags &= ~(SM_OBJDESC_NEEDS_FINALIZATION_MASK | \
|
|
SM_OBJDESC_FINALIZABLE_MASK)) \
|
|
|
|
/******************************************************************************/
|
|
|
|
/* object was free before we started the gc -- gc-only state */
|
|
|
|
#define SM_OBJDESC_WAS_FREE(od) \
|
|
(((od)->flags & SM_OBJDESC_STATE_MASK) == SMObjectState_WasFree) \
|
|
|
|
/******************************************************************************/
|
|
|
|
/* object is pinned -- gc-only flag */
|
|
|
|
#define SM_OBJDESC_PINNED_MASK (1 << SMObjectDescFlag_PinnedBit)
|
|
|
|
/* we need a version of this without asserts or else we blow out CodeWarrior */
|
|
#define SM_OBJDESC_IS_PINNED0(od) \
|
|
((od)->flags & SM_OBJDESC_PINNED_MASK) \
|
|
|
|
#define SM_OBJDESC_IS_PINNED(od) \
|
|
(SM_ASSERT(!SM_OBJDESC_WAS_FREE(od)), \
|
|
SM_OBJDESC_IS_PINNED0(od)) \
|
|
|
|
#define SM_OBJDESC_SET_PINNED(od) \
|
|
(SM_ASSERT(!SM_OBJDESC_WAS_FREE(od)), \
|
|
(od)->flags |= SM_OBJDESC_PINNED_MASK) \
|
|
|
|
#define SM_OBJDESC_CLEAR_PINNED(od) \
|
|
(SM_ASSERT(!SM_OBJDESC_WAS_FREE(od)), \
|
|
(od)->flags &= ~SM_OBJDESC_PINNED_MASK) \
|
|
|
|
/******************************************************************************/
|
|
|
|
/* object is marked -- gc-only state */
|
|
|
|
#define SM_OBJDESC_IS_MARKED(od) ((od)->flags < 0)
|
|
|
|
#define SM_OBJDESC_UNTRACED_OR_UNMARKED_MASK \
|
|
((1 << SMObjectDescFlag_StateBit2) | \
|
|
(1 << SMObjectDescFlag_StateBit0)) \
|
|
|
|
#define SM_OBJDESC_UNTRACED_OR_UNMARKED(od) \
|
|
(((od)->flags & SM_OBJDESC_UNTRACED_OR_UNMARKED_MASK) \
|
|
== SMObjectState_Unmarked) \
|
|
|
|
#define SM_OBJDESC_SET_MARKED(od) \
|
|
(SM_ASSERT(SM_OBJDESC_UNTRACED_OR_UNMARKED(od)), \
|
|
((od)->flags |= SMObjectState_Marked)) \
|
|
|
|
/******************************************************************************/
|
|
|
|
/* done before a gc (works for free objects too) -- gc-only state */
|
|
|
|
#define SM_OBJDESC_IS_UNMARKED(od) \
|
|
(((od)->flags & SM_OBJDESC_STATE_MASK) == SMObjectState_Unmarked) \
|
|
|
|
#define SM_OBJDESC_SET_UNMARKED(od) \
|
|
((od)->flags &= ~(SM_OBJDESC_ALLOCATED_MASK | SM_OBJDESC_PINNED_MASK))\
|
|
|
|
/******************************************************************************/
|
|
|
|
/* done when the mark stack overflows -- gc-only state */
|
|
|
|
#define SM_OBJDESC_IS_UNTRACED(od) \
|
|
(((od)->flags & SM_OBJDESC_STATE_MASK) == SMObjectState_Untraced) \
|
|
|
|
#define SM_OBJDESC_SET_UNTRACED(od) \
|
|
(SM_ASSERT(SM_OBJDESC_IS_MARKED(od)), \
|
|
(od)->flags |= SMObjectState_Untraced) \
|
|
|
|
#define SM_OBJDESC_CLEAR_UNTRACED(od) \
|
|
(SM_ASSERT(SM_OBJDESC_IS_UNTRACED(od)), \
|
|
(od)->flags &= ~(1 << SMObjectDescFlag_StateBit2)) \
|
|
|
|
/******************************************************************************/
|
|
|
|
/* done when an object is promoted -- gc-only state */
|
|
|
|
#define SM_OBJDESC_IS_FORWARDED(od) \
|
|
(((od)->flags & SM_OBJDESC_STATE_MASK) == SMObjectState_Forwarded) \
|
|
|
|
#define SM_OBJDESC_SET_FORWARDED(od) \
|
|
(SM_ASSERT(SM_OBJDESC_IS_UNMARKED(od)), \
|
|
SM_ASSERT(!SM_OBJDESC_IS_PINNED0(od)), \
|
|
(od)->flags = (PRUint8)SMObjectState_Forwarded) \
|
|
|
|
/******************************************************************************/
|
|
|
|
/* done when an object survives a copy cycle -- gc-only state */
|
|
|
|
#define SM_OBJDESC_COPYABLE_MASK (1 << SMObjectDescFlag_CopyableBit)
|
|
|
|
#define SM_OBJDESC_IS_COPYABLE(od) \
|
|
(((od)->flags & SM_OBJDESC_COPYABLE_MASK) == SM_OBJDESC_COPYABLE_MASK)\
|
|
|
|
#define SM_OBJDESC_SET_COPYABLE(od) \
|
|
((od)->flags |= SM_OBJDESC_COPYABLE_MASK) \
|
|
|
|
#define SM_OBJDESC_SET_COPYABLE_BUT_PINNED(od) \
|
|
((od)->flags |= (SM_OBJDESC_COPYABLE_MASK | SM_OBJDESC_PINNED_MASK)) \
|
|
|
|
/* copyable and not pinned */
|
|
#define SM_OBJDESC_DO_COPY(od) \
|
|
(SM_ASSERT(!SM_OBJDESC_WAS_FREE(od)), \
|
|
((od)->flags & (SM_OBJDESC_PINNED_MASK | SM_OBJDESC_COPYABLE_MASK)) \
|
|
== SM_OBJDESC_COPYABLE_MASK) \
|
|
|
|
/******************************************************************************/
|
|
|
|
#ifdef DEBUG
|
|
#define SM_COPY_CYCLE_BITS 1 /* copy every other collect */
|
|
#else
|
|
#define SM_COPY_CYCLE_BITS 3 /* copy every 8th collect */
|
|
#endif
|
|
#define SM_COPY_CYCLE_MASK ((1 << SM_COPY_CYCLE_BITS) - 1)
|
|
#define SM_IS_COPY_CYCLE(genNum) \
|
|
((PRBool)((sm_Heap.gen[genNum].collectCount & SM_COPY_CYCLE_MASK) == 0))
|
|
|
|
/*******************************************************************************
|
|
* Object Operations
|
|
******************************************************************************/
|
|
|
|
#define SM_OBJECT_FORWARDING_ADDR(obj) \
|
|
((SMObject*)SM_OBJECT_CLASS(obj)) \
|
|
|
|
#define SM_OBJECT_SET_FORWARDING_ADDR(obj, newAddr) \
|
|
(SM_OBJECT_CLASS(obj) = (SMClass*)(SM_ENSURE(SMObject, newAddr))) \
|
|
|
|
/*******************************************************************************
|
|
* Card Descriptors
|
|
******************************************************************************/
|
|
|
|
typedef PRUint8 SMCardDesc;
|
|
|
|
#define SM_CARDDESC_IS_DIRTY(cd) ((cd) == 0)
|
|
#define SM_CARDDESC_SET_GEN(cdAddr, genNum) (*(cdAddr) = SM_GEN_CARDDESC(genNum))
|
|
#define SM_CARDDESC_INIT(cdAddr) SM_CARDDESC_SET_GEN(cdAddr, SMGenNum_Free)
|
|
|
|
/*******************************************************************************
|
|
* Heap
|
|
******************************************************************************/
|
|
|
|
struct SMHeap {
|
|
SMGen gen[SM_GEN_COUNT];
|
|
SMStack markStack;
|
|
SMMarkRootsProc markRootsProc;
|
|
void* markRootsClosure;
|
|
SMGCHookProc beforeGCHook;
|
|
void* beforeGCClosure;
|
|
SMGCHookProc afterGCHook;
|
|
void* afterGCClosure;
|
|
SMGenNum collectingGenNum;
|
|
/* finalizer stuff */
|
|
PRThread* finalizer;
|
|
PRMonitor* finalizerMon;
|
|
PRBool keepRunning;
|
|
#ifndef SM_NO_WRITE_BARRIER
|
|
SMCardDesc* cardTableMem;
|
|
PRUword cardTablePageCount;
|
|
#endif
|
|
};
|
|
|
|
/* So here's the story: I was going to allow multiple heaps to exist
|
|
simultaneously (not strictly necessary, but it might be a useful feature
|
|
someday) but I backed it out because of the extra dereferences it introduces
|
|
in order to get at any of the heap global data. If we ever need it, we can
|
|
go back and introduce a heap argument to most of the routines, and eliminate
|
|
this global. We'd also have to make SM_Init return a new heap. */
|
|
extern SMHeap sm_Heap; /* _the_ global heap */
|
|
|
|
/*******************************************************************************
|
|
* Debug Methods
|
|
******************************************************************************/
|
|
|
|
#ifdef SM_STATS /* define this if you want stat code in the final product */
|
|
|
|
#include <stdio.h>
|
|
|
|
typedef struct SMStatRecord {
|
|
PRUword amountUsed;
|
|
PRUword amountFree;
|
|
PRUword overhead;
|
|
PRUword collections;
|
|
/* for figuring internal fragmentation of allocation requests */
|
|
PRUword totalAllocated;
|
|
PRUword totalRequested;
|
|
} SMStatRecord;
|
|
|
|
typedef struct SMStats {
|
|
SMStatRecord total;
|
|
SMStatRecord perGen[SM_GEN_COUNT + 1];
|
|
PRUword systemOverhead;
|
|
} SMStats;
|
|
|
|
SM_EXTERN(void)
|
|
SM_Stats(SMStats* stats);
|
|
|
|
SM_EXTERN(void)
|
|
SM_DumpStats(FILE* out, PRBool detailed);
|
|
|
|
#endif /* SM_STATS */
|
|
|
|
/******************************************************************************/
|
|
|
|
#ifdef DEBUG
|
|
|
|
SM_EXTERN(void)
|
|
SM_SetCollectThresholds(PRUword gen0Threshold, PRUword gen1Threshold,
|
|
PRUword gen2Threshold, PRUword gen3Threshold,
|
|
PRUword staticGenThreshold);
|
|
|
|
#endif /* DEBUG */
|
|
|
|
#ifdef SM_VERIFY
|
|
|
|
extern void
|
|
sm_VerifyHeap(void);
|
|
|
|
#define SM_VERIFY_HEAP() sm_VerifyHeap()
|
|
|
|
#else /* !SM_VERIFY */
|
|
|
|
#define SM_VERIFY_HEAP() /* no-op */
|
|
|
|
#endif /* !SM_VERIFY */
|
|
|
|
/*******************************************************************************
|
|
* Private Methods
|
|
******************************************************************************/
|
|
|
|
extern PRStatus
|
|
sm_InitFinalizer(void);
|
|
|
|
extern PRStatus
|
|
sm_FiniFinalizer(PRBool finalizeOnExit);
|
|
|
|
extern SMObjStruct*
|
|
sm_AddGCPage(SMGenNum genNum, SMBucket bucket);
|
|
|
|
extern SMObjStruct*
|
|
sm_Alloc(PRUword instanceSize, SMBucket bucket);
|
|
|
|
extern void
|
|
sm_Collect0(SMGenNum collectingGenNum, PRBool copyCycle);
|
|
|
|
extern PRBool
|
|
sm_CollectAndFinalizeAll(PRUword spaceNeeded);
|
|
|
|
/******************************************************************************/
|
|
|
|
SM_END_EXTERN_C
|
|
|
|
#endif /* __SMHEAP__ */
|
|
/******************************************************************************/
|