mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-27 06:43:32 +00:00
358 lines
13 KiB
C
358 lines
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
|
|
*******************************************************************************/
|
|
|
|
/*
|
|
** SportModel is a hybrid, mark-and-sweep, mostly-copying, card-marking
|
|
** generational garbage collector designed for very low level-two cache miss
|
|
** rates. The intended use is for the ElectricalFire Java implementation,
|
|
** although it is not ElectricalFire or Java specific. It also includes an
|
|
** integrated malloc/free package.
|
|
*/
|
|
|
|
#ifndef __SM__
|
|
#define __SM__
|
|
|
|
#include "smpriv.h"
|
|
|
|
SM_BEGIN_EXTERN_C
|
|
|
|
/*******************************************************************************
|
|
* Types and Constants
|
|
******************************************************************************/
|
|
|
|
typedef struct SMHeap SMHeap;
|
|
typedef union SMClass SMClass;
|
|
typedef struct SMObjectClass SMObjectClass;
|
|
typedef struct SMArrayClass SMArrayClass;
|
|
typedef struct SMPrimClass SMPrimClass;
|
|
typedef struct SMObject SMObject;
|
|
typedef struct SMArray SMArray;
|
|
typedef struct SMObjStruct SMObjStruct;
|
|
typedef struct SMArrayStruct SMArrayStruct;
|
|
|
|
typedef enum SMGenNum {
|
|
SMGenNum_Freshman = 0, /* for new allocations */
|
|
SMGenNum_Sophomore, /* first survivor generation */
|
|
SMGenNum_Junior, /* oldest generation for applets */
|
|
SMGenNum_Senior, /* oldest generation for system code */
|
|
SMGenNum_Static, /* static space -- scanned, but not marked */
|
|
SMGenNum_Malloc, /* malloc space -- explicitly freed */
|
|
SMGenNum_Free = 7 /* pages unused by malloc or gc */
|
|
} SMGenNum;
|
|
|
|
/******************************************************************************/
|
|
|
|
SM_DECLARE_ENSURE(SMObject)
|
|
SM_DECLARE_ENSURE(SMObjStruct)
|
|
SM_DECLARE_ENSURE(SMArray)
|
|
SM_DECLARE_ENSURE(SMArrayStruct)
|
|
|
|
#define SM_ENCRYPT_OBJECT(obj) ((SMObject*)SM_ENCRYPT(SM_ENSURE(SMObjStruct, obj)))
|
|
#define SM_DECRYPT_OBJECT(obj) ((SMObjStruct*)SM_DECRYPT(SM_ENSURE(SMObject, obj)))
|
|
|
|
#define SM_ENCRYPT_ARRAY(arr) ((SMArray*)SM_ENCRYPT(SM_ENSURE(SMArrayStruct, arr)))
|
|
#define SM_DECRYPT_ARRAY(arr) ((SMArrayStruct*)SM_DECRYPT(SM_ENSURE(SMArray, arr)))
|
|
|
|
/* XXX add ifdef SM_COLLECT_CLASSES */
|
|
#define SM_ENCRYPT_CLASS(cl) (cl)
|
|
#define SM_DECRYPT_CLASS(cl) (cl)
|
|
|
|
/*******************************************************************************
|
|
* Startup/Shutdown Routines
|
|
******************************************************************************/
|
|
|
|
SM_EXTERN(void)
|
|
SM_MarkRoots(SMObject** base, PRUword count, PRBool conservative);
|
|
|
|
/* The user must define a root marking routine with the following signature.
|
|
It's job is to call SM_MarkRoots for all roots in the program. This routine
|
|
is registered by calling SM_InitHeap. */
|
|
typedef void
|
|
(*SMMarkRootsProc)(SMGenNum collectingGenNum, PRBool copyCycle, void* closure);
|
|
|
|
/* This function must be called as the first thing in the user's SMMarkRootsProc
|
|
(or _be_ the user's SMMarkRootsProc if there are no other roots) if NSPR
|
|
threads are to be scanned conservatively. Failure to call this indicates
|
|
either that you know what you're doing, or you have a bug. */
|
|
SM_EXTERN(void)
|
|
SM_MarkThreadsConservatively(SMGenNum collectingGenNum, PRBool copyCycle,
|
|
void* closure);
|
|
|
|
/* This function allows finer grained control over exactly which threads are
|
|
scanned conservatively. */
|
|
SM_EXTERN(void)
|
|
SM_MarkThreadConservatively(PRThread* thread, SMGenNum collectingGenNum,
|
|
PRBool copyCycle, void* closure);
|
|
|
|
/* The SMGCHookProc defines the signature of the before and after gc hook
|
|
procedures. These are called before and after a collection on the thread
|
|
which caused the collection. The primary function of these hooks is to allow
|
|
any locks needed by the root marking procedure to be entered (and exited)
|
|
because once the collection process has started, all other threads are
|
|
suspended, and no locks (or monitors) can be waited on. */
|
|
typedef void
|
|
(*SMGCHookProc)(SMGenNum collectingGenNum, PRUword collectCount,
|
|
PRBool copyCycle, void* closure);
|
|
|
|
/* Initialize the garbage collector system. */
|
|
SM_EXTERN(PRStatus)
|
|
SM_InitGC(PRUword initialHeapSize, PRUword maxHeapSize,
|
|
SMGCHookProc beforeGCHook, void* beforeGCClosure,
|
|
SMGCHookProc afterGCHook, void* afterGCClosure,
|
|
SMMarkRootsProc markRootsProc, void* markRootsClosure);
|
|
|
|
/* Shutdown the garbage collector system. */
|
|
SM_EXTERN(PRStatus)
|
|
SM_CleanupGC(PRBool finalizeOnExit);
|
|
|
|
/* Initialize the malloc system. This is done implicitly when SM_InitGC is called. */
|
|
SM_EXTERN(PRStatus)
|
|
SM_InitMalloc(PRUword initialHeapSize, PRUword maxHeapSize);
|
|
|
|
/* Shutdown the malloc system. This is done implicitly when SM_CleanupGC is called. */
|
|
SM_EXTERN(PRStatus)
|
|
SM_CleanupMalloc(void);
|
|
|
|
/*******************************************************************************
|
|
* Allocation and Collection
|
|
******************************************************************************/
|
|
|
|
/* Allocates a garbage-collectable object of a given class.
|
|
The class must be constructed via SM_InitObjectClass. */
|
|
SM_EXTERN(SMObject*)
|
|
SM_AllocObject(SMObjectClass* clazz);
|
|
|
|
/* Allocates a garbage-collectable array object of a given class.
|
|
The class must be constructed via SM_InitArrayClass. */
|
|
SM_EXTERN(SMArray*)
|
|
SM_AllocArray(SMArrayClass* clazz, PRUword size);
|
|
|
|
/* Allocates a garbage-collectable object of a given class, but with extra space
|
|
at the end of the object. The size of the extra space is specified in bytes
|
|
and is not examined by the garbage collector. A pointer to the beginning of
|
|
the extra space can be obtained by SM_OBJECT_EXTRA(obj);
|
|
The class must be constructed via SM_InitObjectClass. */
|
|
SM_EXTERN(SMObject*)
|
|
SM_AllocObjectExtra(SMObjectClass* clazz, PRUword extraBytes);
|
|
|
|
/* Returns the size of an object in bytes. This function cannot be used on
|
|
malloc'd objects. */
|
|
SM_EXTERN(PRUword)
|
|
SM_ObjectSize(SMObject* obj);
|
|
|
|
/* Returns a new object which is a shallow copy of the original. */
|
|
SM_EXTERN(SMObject*)
|
|
SM_Clone(SMObject* obj);
|
|
|
|
/* Forces a garbage collection of the entire heap. */
|
|
SM_EXTERN(void)
|
|
SM_Collect(void);
|
|
|
|
/* Forces finalization to occur. */
|
|
SM_EXTERN(void)
|
|
SM_RunFinalization(void);
|
|
|
|
/*******************************************************************************
|
|
* Malloc and Friends
|
|
*
|
|
* These memory management routines may be used as an alternative to malloc,
|
|
* free and associated routines. It is an exercise to the application
|
|
* programmer to cause these routines to be linked as _the_ malloc and free
|
|
* routines for the application. The garbage collector itself uses these
|
|
* routines internally and does not otherwise depend on malloc, free, etc.
|
|
******************************************************************************/
|
|
|
|
SM_EXTERN(void*)
|
|
SM_Malloc(PRUword size);
|
|
|
|
SM_EXTERN(void)
|
|
SM_Free(void* ptr);
|
|
|
|
SM_EXTERN(void*)
|
|
SM_Calloc(PRUword size, PRUword count);
|
|
|
|
SM_EXTERN(void*)
|
|
SM_Realloc(void* ptr, PRUword size);
|
|
|
|
SM_EXTERN(void*)
|
|
SM_Strdup(void* str);
|
|
|
|
SM_EXTERN(void*)
|
|
SM_Strndup(void* str, PRUword size);
|
|
|
|
/*******************************************************************************
|
|
* Memory Pool variation of Malloc and Friends
|
|
******************************************************************************/
|
|
|
|
typedef struct SMPool SMPool;
|
|
|
|
SM_EXTERN(SMPool*)
|
|
SM_NewPool(void);
|
|
|
|
SM_EXTERN(void)
|
|
SM_DeletePool(SMPool* pool);
|
|
|
|
SM_EXTERN(void*)
|
|
SM_PoolMalloc(SMPool* pool, PRUword size);
|
|
|
|
SM_EXTERN(void)
|
|
SM_PoolFree(SMPool* pool, void* ptr);
|
|
|
|
SM_EXTERN(void*)
|
|
SM_PoolCalloc(SMPool* pool, PRUword size, PRUword count);
|
|
|
|
SM_EXTERN(void*)
|
|
SM_PoolRealloc(SMPool* pool, void* ptr, PRUword size);
|
|
|
|
SM_EXTERN(void*)
|
|
SM_PoolStrdup(SMPool* pool, void* str);
|
|
|
|
SM_EXTERN(void*)
|
|
SM_PoolStrndup(SMPool* pool, void* str, PRUword size);
|
|
|
|
/*******************************************************************************
|
|
* Write Barrier
|
|
*
|
|
* All assignments to garbage collected object fields must go through the write
|
|
* barrier. This allows the collector to focus on a smaller portion of the heap
|
|
* during a collection (a "generation") while remaining informed about changes
|
|
* made to objects of other generations.
|
|
*
|
|
* To set a field of an object or an element of an array, rather than writing:
|
|
*
|
|
* obj->fieldName = value;
|
|
* arr[i] = value;
|
|
*
|
|
* one must instead write the following:
|
|
*
|
|
* SM_SET_FIELD(ObjType, obj, fieldName, value);
|
|
* SM_SET_ELEMENT(ObjType, arr, i, value);
|
|
*
|
|
* Failure to use the SM_SET macros for all assignments will ultimately result
|
|
* in system failure (i.e. a crash). But in order to aid in tracking down
|
|
* problems related to this, the SM_CHECK_PTRS preprocessor symbol may be
|
|
* defined which causes all object pointers to be "encrypted" in such a way
|
|
* that any attempt to access an object pointer outside of the SM_SET
|
|
* macros will cause an immediate crash. Crashes of this sort point to places
|
|
* in the code where the macros were forgotten. However, use of this encryption
|
|
* technique also requires all read accesses to go through an equivalent pair
|
|
* of macros, e.g. rather than writing:
|
|
*
|
|
* obj->fieldName
|
|
* arr[i]
|
|
*
|
|
* one must instead write the following:
|
|
*
|
|
* SM_GET_FIELD(ObjType, obj, fieldName)
|
|
* SM_GET_ELEMENT(ObjType, arr, i)
|
|
*
|
|
******************************************************************************/
|
|
|
|
SM_EXTERN(PRUint8*) SM_CardTable;
|
|
|
|
/* Accessors for debugging: */
|
|
|
|
#define SM_GET_ELEMENT(ObjType, obj, index) \
|
|
(((ObjType*)SM_DECRYPT(obj))[index]) \
|
|
|
|
#define SM_GET_FIELD(ObjType, obj, fieldName) \
|
|
(((ObjType*)SM_DECRYPT(obj))->fieldName) \
|
|
|
|
/* Unsafe assignment -- only to be used if you really know what you're
|
|
doing, e.g. initializing a newly created object's fields: */
|
|
|
|
#define SM_SET_ELEMENT_UNSAFE(ObjType, obj, index, value) \
|
|
(SM_GET_ELEMENT(ObjType, obj, index) = (value)) \
|
|
|
|
#define SM_SET_FIELD_UNSAFE(ObjType, obj, fieldName, value) \
|
|
(SM_GET_FIELD(ObjType, obj, fieldName) = (value)) \
|
|
|
|
#ifdef SM_NO_WRITE_BARRIER
|
|
|
|
#define SM_OBJECT_CARDDESC(obj) NULL
|
|
#define SM_DIRTY_PAGE(addr) ((void)0)
|
|
#define SM_CLEAN_PAGE(addr) ((void)0)
|
|
|
|
#else /* !SM_NO_WRITE_BARRIER */
|
|
|
|
#define SM_OBJECT_CARDDESC(obj) (&SM_CardTable[SM_PAGE_NUMBER(SM_DECRYPT_OBJECT(obj))])
|
|
#define SM_CARDDESC_GEN(cd) ((SMGenNum)((cd) - 1))
|
|
#define SM_GEN_CARDDESC(genNum) ((PRUint8)(genNum) + 1)
|
|
|
|
#ifdef DEBUG
|
|
SM_EXTERN(void) SM_DirtyPage(void* addr);
|
|
SM_EXTERN(void) SM_CleanPage(void* addr);
|
|
#define SM_DIRTY_PAGE(addr) SM_DirtyPage(addr)
|
|
#define SM_CLEAN_PAGE(addr) SM_CleanPage(addr)
|
|
#else /* DEBUG */
|
|
#define SM_DIRTY_PAGE(addr) (*SM_OBJECT_CARDDESC(addr) = 0)
|
|
#define SM_CLEAN_PAGE(addr) (*SM_OBJECT_CARDDESC(addr) = SM_GEN_CARDDESC(SMGenNum_Free))
|
|
#endif /* DEBUG */
|
|
|
|
#endif /* !SM_NO_WRITE_BARRIER */
|
|
|
|
/* Safe assignment that uses the write barrier: */
|
|
|
|
#define SM_SET_ELEMENT(ObjType, obj, index, value) \
|
|
{ \
|
|
ObjType* _obj = obj; \
|
|
SM_SET_ELEMENT_UNSAFE(ObjType, _obj, index, value); \
|
|
SM_DIRTY_PAGE(_obj); \
|
|
} \
|
|
|
|
#define SM_SET_FIELD(ObjType, obj, fieldName, value) \
|
|
{ \
|
|
ObjType* _obj = obj; \
|
|
SM_SET_FIELD_UNSAFE(ObjType, _obj, fieldName, value); \
|
|
SM_DIRTY_PAGE(_obj); \
|
|
} \
|
|
|
|
/******************************************************************************/
|
|
|
|
#if defined(DEBUG) || defined(SM_DUMP)
|
|
|
|
SM_EXTERN(void)
|
|
SM_SetTraceOutputFile(FILE* out);
|
|
|
|
#endif /* defined(DEBUG) || defined(SM_DUMP) */
|
|
|
|
/******************************************************************************/
|
|
|
|
SM_END_EXTERN_C
|
|
|
|
#endif /* __SM__ */
|
|
/******************************************************************************/
|