зеркало из https://github.com/mozilla/gecko-dev.git
287 строки
11 KiB
C
287 строки
11 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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/*******************************************************************************
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S P O R T M O D E L
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_____
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____/_____\____
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/__o____o____o__\ __
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\_______________/ (@@)/
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/\_____|_____/\ x~[]~
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~~~~~~~~~~~/~~~~~~~|~~~~~~~\~~~~~~~~/\~~~~~~~~~
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Advanced Technology Garbage Collector
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Copyright (c) 1997 Netscape Communications, Inc. All rights reserved.
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Recovered by: Warren Harris
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*******************************************************************************/
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#ifndef __SMPAGE__
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#define __SMPAGE__
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#include "sm.h"
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#include "prmon.h"
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SM_BEGIN_EXTERN_C
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/*******************************************************************************
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* Constants
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******************************************************************************/
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#define SM_PAGE_BITS 12 /* 4k pages */
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#define SM_PAGE_SIZE (1 << SM_PAGE_BITS)
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#define SM_PAGE_MASK (SM_PAGE_SIZE - 1)
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#define SM_PAGE_REFS (SM_PAGE_SIZE / sizeof(void*))
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/* (1 << SM_REF_BITS) == sizeof(void*) */
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#if defined(XP_WIN) && !defined(_WIN32)
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#define SM_REF_BITS 1
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#elif defined(IS_64)
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#define SM_REF_BITS 3
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#else
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#define SM_REF_BITS 2
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#endif
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/*******************************************************************************
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* Types
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******************************************************************************/
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typedef PRUint8 SMPage[SM_PAGE_SIZE];
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typedef PRUword SMPageCount; /* int big enough to count pages */
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/* SMSmallObjCount: int big enough to count objects per page */
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#if SM_PAGE_BITS <= 8
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typedef PRUint8 SMSmallObjCount;
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#elif SM_PAGE_BITS <= 16
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typedef PRUint16 SMSmallObjCount;
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#else
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typedef PRUint32 SMSmallObjCount;
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#endif
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/*******************************************************************************
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* Macros
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******************************************************************************/
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#define SM_PAGE_NUMBER(addr) ((SMPageCount)(addr) >> SM_PAGE_BITS)
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#define SM_PAGE_ADDR(num) ((SMPage*)((SMPageCount)(num) << SM_PAGE_BITS))
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#define SM_PAGE_OFFSET(addr) ((PRUword)(addr) & SM_PAGE_MASK)
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#define SM_PAGE_REFOFFSET(addr) (SM_PAGE_OFFSET(addr) >> SM_REF_BITS)
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#define SM_PAGE_BASE(addr) ((SMPage*)((PRUword)(addr) & ~SM_PAGE_MASK))
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#define SM_PAGE_COUNT(size) SM_PAGE_NUMBER((size) + SM_PAGE_MASK)
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#define SM_PAGE_WIDTH(count) ((PRUword)((SMPageCount)(count) << SM_PAGE_BITS))
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#define SM_PAGE_ROUNDDN(addr) ((SMPage*)SM_ALIGN((PRUword)(addr), SM_PAGE_BITS))
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#define SM_PAGE_ROUNDUP(addr) SM_PAGE_ROUNDDN((PRUword)(addr) + SM_PAGE_SIZE)
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/*******************************************************************************
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* Object Descriptors
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******************************************************************************/
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typedef struct SMObjDesc {
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PRInt8 flags; /* must be signed */
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} SMObjDesc;
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typedef enum SMObjectDescFlag {
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SMObjectDescFlag_FinalizableBit,
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SMObjectDescFlag_NeedsFinalizationBit,
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SMObjectDescFlag_PinnedBit,
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SMObjectDescFlag_CopyableBit,
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SMObjectDescFlag_Unused0,
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SMObjectDescFlag_StateBit0,
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SMObjectDescFlag_StateBit1,
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SMObjectDescFlag_StateBit2 /* high bit -- can use test for negative */
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} SMObjectDescFlag;
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/* Be careful about changing these SMObjectState values. The macros below
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are highly dependent on them. */
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typedef enum SMObjectState {
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SMObjectState_WasFree = 0x00, /* 00000000 */
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SMObjectState_Unmarked = 0x20, /* 00100000 */
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SMObjectState_Untraced = 0x60, /* 01100000 */
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SMObjectState_Forwarded = 0x80, /* 10000000 */
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SMObjectState_Marked = 0xE0 /* 11100000 */
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} SMObjectState;
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#define SM_OBJDESC_STATE_MASK ((1 << SMObjectDescFlag_StateBit2) | \
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(1 << SMObjectDescFlag_StateBit1) | \
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(1 << SMObjectDescFlag_StateBit0))
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/******************************************************************************/
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/* (space for) object is really free -- non-gc state */
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#define SM_OBJDESC_FREE_MASK (1 << SMObjectDescFlag_StateBit1)
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#define SM_OBJDESC_IS_FREE(od) \
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(((od)->flags & SM_OBJDESC_FREE_MASK) == 0) \
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#define SM_OBJDESC_SET_FREE(od) ((od)->flags = 0)
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/******************************************************************************/
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/* object is allocated -- non-gc state */
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#define SM_OBJDESC_ALLOCATED_MASK ((1 << SMObjectDescFlag_StateBit2) | \
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(1 << SMObjectDescFlag_StateBit1))
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#define SM_OBJDESC_IS_ALLOCATED(od) \
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(((od)->flags & SM_OBJDESC_ALLOCATED_MASK) \
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== SM_OBJDESC_ALLOCATED_MASK) \
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#define SM_OBJDESC_SET_ALLOCATED(od) \
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(SM_ASSERT(SM_OBJDESC_IS_FREE(od)), \
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((od)->flags |= SMObjectState_Marked)) \
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/*******************************************************************************
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* Page Descriptors
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******************************************************************************/
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typedef struct SMPageDesc SMPageDesc;
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struct SMPageDesc {
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SMPageDesc* next;
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SMObjDesc* objTable;
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SMSmallObjCount allocCount;
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PRUint8 flags;
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SMObjDesc largeObjDesc;
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};
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typedef enum SMPageFlag {
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SMPageFlag_GenBit0,
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SMPageFlag_GenBit1,
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SMPageFlag_GenBit2,
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SMPageFlag_BlackListedBit,
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SMPageFlag_BucketBit0,
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SMPageFlag_BucketBit1,
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SMPageFlag_BucketBit2,
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SMPageFlag_BucketBit3
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} SMPageFlag;
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#define SM_PAGEDESC_GEN_BITS (SMPageFlag_GenBit2 + 1)
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#define SM_PAGEDESC_GEN_MASK ((1 << SM_PAGEDESC_GEN_BITS) - 1)
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#define SM_PAGEDESC_GEN(pd) ((SMGenNum)((pd)->flags & SM_PAGEDESC_GEN_MASK))
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#define SM_PAGEDESC_INCR_GEN(pd) ((pd)->flags += 1)
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#define SM_PAGEDESC_BUCKET(pd) ((pd)->flags >> SMPageFlag_BucketBit0)
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#define SM_PAGEDESC_BLACKLISTED_MASK (1 << SMPageFlag_BlackListedBit)
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#define SM_PAGEDESC_IS_BLACKLISTED(pd) ((pd)->flags & SM_PAGEDESC_BLACKLISTED_MASK)
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#define SM_PAGEDESC_SET_BLACKLISTED(pd) ((pd)->flags |= SM_PAGEDESC_BLACKLISTED_MASK)
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#define SM_PAGEDESC_CLEAR_BLACKLISTED(pd) ((pd)->flags &= ~SM_PAGEDESC_BLACKLISTED_MASK)
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#define SM_PAGEDESC_INIT(pd, bucket, genNum, objTab, allocCnt) \
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((pd)->next = NULL, \
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(pd)->objTable = (objTab), \
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(pd)->allocCount = (allocCnt), \
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(pd)->flags = ((bucket) << SMPageFlag_BucketBit0) | (genNum), \
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(pd)->largeObjDesc.flags = 0) \
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#define SM_PAGEDESC_BUCKET_BITS 4
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#define SM_PAGEDESC_BUCKET_COUNT (1 << SM_PAGEDESC_BUCKET_BITS)
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#define SM_PAGEDESC_PAGENUM(pd) (pd - sm_PageMgr.pageTable)
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#define SM_PAGEDESC_PAGE(pd) SM_PAGE_ADDR(SM_PAGEDESC_PAGENUM(pd))
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/******************************************************************************/
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#define SM_PAGEDESC_IS_LARGE_OBJECT_START(pd) ((pd)->allocCount != 0)
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/* The following only works if pd is not the start of a large object: */
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#define SM_PAGEDESC_LARGE_OBJECT_START(pd) ((pd)->next)
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/*******************************************************************************
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* Page Manager
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******************************************************************************/
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typedef struct SMClusterDesc SMClusterDesc;
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typedef struct SMSegmentDesc SMSegmentDesc;
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typedef struct SMPageMgr {
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SMClusterDesc* freeClusters;
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PRMonitor* monitor;
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SMPage* memoryBase;
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SMPage* boundary;
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SMPageCount minPage;
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SMPageCount pageCount;
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PRBool alreadyLocked;
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#if defined(XP_MAC)
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PRUint8* segMap;
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SMSegmentDesc* segTable;
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PRWord segTableCount;
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#endif
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/* the page table */
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SMPageDesc* pageTableMem;
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SMPageDesc* pageTable; /* one per page */
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SMPage* heapBase;
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PRUword heapPageCount;
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} SMPageMgr;
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#define SM_PAGEMGR_IN_RANGE(pm, ptr) \
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((void*)(pm)->heapBase <= (ptr) && (ptr) < (void*)(pm)->boundary)
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/* So here's the story: I was going to allow multiple heaps to exist
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simultaneously (not strictly necessary, but it might be a useful feature
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someday) but I backed it out because of the extra dereferences it introduces
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in order to get at any of the heap global data. If we ever need it, we can
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go back and introduce a heap argument to most of the routines, and eliminate
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this global. We'd also have to make SM_Init return a new heap. */
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extern SMPageMgr sm_PageMgr; /* _the_ global page manager */
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/*******************************************************************************
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* Object Operations
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******************************************************************************/
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#define SM_OBJECT_PAGEDESC(obj) \
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(&sm_PageMgr.pageTable[SM_PAGE_NUMBER(obj)]) \
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#define SM_OBJECT_HEADER_FROM_PAGEDESC(obj, pageDesc) \
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(&(pageDesc)->objTable[SM_DIV((SMSmallObjCount)SM_PAGE_OFFSET(obj), \
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SM_PAGEDESC_BUCKET(pageDesc))]) \
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#define SM_IN_HEAP(obj) \
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SM_PAGEMGR_IN_RANGE(&sm_PageMgr, (void*)SM_ENSURE(SMObjStruct, obj)) \
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/*******************************************************************************
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* Functions
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******************************************************************************/
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extern PRStatus
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sm_InitPageMgr(SMPageMgr* pm, SMPageCount minPages, SMPageCount maxPages);
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extern void
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sm_FiniPageMgr(SMPageMgr* pm);
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extern SMPage*
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sm_NewCluster(SMPageMgr* pm, SMPageCount nPages);
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extern void
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sm_DestroyCluster(SMPageMgr* pm, SMPage* basePage, SMPageCount nPages);
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#define SM_NEW_PAGE(pm) sm_NewCluster((pm), 1)
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#define SM_DESTROY_PAGE(pm, page) sm_DestroyCluster((pm), (page), 1)
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/******************************************************************************/
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SM_END_EXTERN_C
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#endif /* __SMPAGE__ */
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/******************************************************************************/
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