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pjs/ef/gc/include/smobj.h

356 строки
12 KiB
C
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/*******************************************************************************
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 __SMOBJ__
#define __SMOBJ__
#include "sm.h"
#include "smpool.h"
#include <stdio.h>
SM_BEGIN_EXTERN_C
/*******************************************************************************
* Instances
******************************************************************************/
struct SMObjStruct {
SMClass* clazz;
void* subHeader;
/* fields follow... */
};
struct SMArrayStruct {
SMClass* clazz;
void* subHeader;
PRUword size;
/* elements follow... */
};
#if defined(DEBUG) && !defined(SM_CHECK_PTRS)
/* so we can see what's going on in the debugger... */
struct SMObject {
SMClass* clazz;
void* subHeader;
SMObject* field0;
SMObject* field1;
SMObject* field2;
SMObject* field3;
};
struct SMArray {
SMClass* clazz;
void* subHeader;
PRUword size;
SMObject* element0;
SMObject* element1;
SMObject* element2;
SMObject* element3;
};
#else
struct SMObject {
PRUword encrypted;
};
struct SMArray {
PRUword encrypted;
};
#endif
/******************************************************************************/
#define SM_OBJECT_CLASS(obj) (SM_DECRYPT_OBJECT(obj)->clazz)
#define SM_OBJECT_FIELDS(obj) ((SMObject**)SM_DECRYPT_OBJECT(obj))
#define SM_OBJECT_EXTRA(obj) \
((void*)((char*)SM_DECRYPT_OBJECT(obj) \
+ SM_OBJECT_CLASS(obj)->object.data.instanceSize)) \
#define SM_ARRAY_CLASS(arr) (SM_DECRYPT_ARRAY(arr)->clazz)
#define SM_ARRAY_SIZE(arr) (SM_DECRYPT_ARRAY(arr)->size)
#define SM_ARRAY_ELEMENTS(arr) \
((SMObject**)((char*)SM_DECRYPT_ARRAY(arr) + sizeof(SMArrayStruct))) \
#ifdef SM_DEBUG_HEADER
/* Just use the subHeader field for this for now (until we get the
new monitors). */
#define SM_OBJECT_DEBUG_CODE 0xFADE
#define SM_CHECK_DEBUG_HEADER(word) (((PRUword)(word) >> 16) == SM_OBJECT_DEBUG_CODE)
#define SM_SET_DEBUG_HEADER(obj, bucket, gen) \
(obj->subHeader = \
(void*)((SM_OBJECT_DEBUG_CODE << 16) | ((bucket) << 8) | (gen))) \
#else
#define SM_CHECK_DEBUG_HEADER(word) 0
#define SM_SET_DEBUG_HEADER(obj, bucket, gen) ((void)0)
#endif
/*******************************************************************************
* Class Objects
*
* Class objects describe the layout of instances and act as vtables for
* method dispatch. They are lower-level than their Java equivalent and only
* contain the necessary information for execution, not reflection, etc.
*
* The "info" field is private to the garbage collector. The "fieldsDescs"
* field points to an array of field descriptors (described above) and may be
* NULL to indicate that there are no collectable fields in the object.
*
* Interface methods in Java are implemented by a mechanism external to this
* representation.
******************************************************************************/
typedef struct SMClassStruct {
SMObjStruct object;
PRUword info;
/* class-kind specific fields follow */
} SMClassStruct;
#define SM_CLASS_KIND_BITS 4
#define SM_CLASS_KIND_MASK ((1 << SM_CLASS_KIND_BITS) - 1)
#define SM_CLASS_KIND(cl) (((SMClassStruct*)(cl))->info & SM_CLASS_KIND_MASK)
#define SM_CLASS_BUCKET_BITS 4
#define SM_CLASS_BUCKET_MASK ((1 << SM_CLASS_KIND_BITS) - 1)
#define SM_CLASS_BUCKET(cl) \
((SMBucket)((((SMClassStruct*)(cl))->info >> SM_CLASS_KIND_BITS) \
& SM_CLASS_BUCKET_MASK)) \
#define SM_CLASS_SET_BUCKET(cl, b) \
(SM_ASSERT((b) <= SM_CLASS_BUCKET_MASK), \
((SMClassStruct*)(cl))->info |= ((b) << SM_CLASS_KIND_BITS)) \
#define SM_CLASS_INIT_INFO(cl, bucket, kind, userData) \
(SM_ASSERT((bucket) <= SM_CLASS_BUCKET_MASK), \
SM_ASSERT((kind) <= SM_CLASS_KIND_MASK), \
(((SMClassStruct*)(cl))->info = \
(userData) | ((bucket) << SM_CLASS_KIND_BITS) | (kind))) \
/* The upper bits of the info field may be freely used by the user program */
#define SM_CLASS_USER_INFO_FIRST_BIT (SM_CLASS_KIND_BITS - SM_CLASS_BUCKET_BITS)
#define SM_CLASS_USER_INFO_BITS \
((sizeof(PRUword) * 8) - SM_CLASS_USER_INFO_FIRST_BIT)
#define SM_CLASS_USER_INFO(cl) ((cl)->info >> SM_CLASS_USER_INFO_BITS)
typedef enum SMClassKind {
/* Primitive class kinds: */
SMClassKind_VoidClass,
SMClassKind_BooleanClass,
SMClassKind_UByteClass, /* Waldemar likes this type although it seems out of place */
SMClassKind_ByteClass,
SMClassKind_CharClass,
SMClassKind_ShortClass,
SMClassKind_IntClass,
SMClassKind_LongClass,
SMClassKind_FloatClass,
SMClassKind_DoubleClass,
/* Structured class kinds: */
SMClassKind_ArrayClass,
SMClassKind_ObjectClass,
SMClassKind_InterfaceClass
} SMClassKind;
#define SM_CLASS_KIND_COUNT (SMClassKind_InterfaceClass + 1)
extern PRUint8 sm_ClassKindSize[SM_CLASS_KIND_COUNT];
#define SM_ELEMENT_SIZE(cl) (sm_ClassKindSize[SM_CLASS_KIND(cl)])
/*******************************************************************************
* Field Descriptors
*
* Classes contain an array of field descriptors, one for each contiguous
* group of garbage-collectable fields. Field offsets are relative to the start
* of the object (i.e. the class descriptor), and are in units of SMObject*
* pointers (not bytes).
******************************************************************************/
typedef struct SMFieldDesc {
PRWord offset; /* number of SMObject* pointers from base */
PRUword count; /* number of pointers at offset */
} SMFieldDesc;
/* This data structure describes where to find the beginning of an array
of field descriptors relative to the beginning of a class object. It
also contains the count of descriptors. */
typedef struct SMFieldDescInfo {
PRUint16 offset; /* start of field descriptors relative to beginning of class */
PRUint16 count; /* number of field descriptors at offset */
} SMFieldDescInfo;
#define SM_CLASS_GET_FIELD_DESCS(cl, fdInfo) \
((SMFieldDesc*)((char*)(cl) + (fdInfo)->offset)) \
/*******************************************************************************
* Standard Methods
*
* These methods exist on all instances, some of which are used by the garbage
* collector internally.
******************************************************************************/
typedef void
(PR_CALLBACK *SMFinalizeFun)(SMObject* obj);
/*******************************************************************************
* Object Class Objects
******************************************************************************/
typedef struct SMObjectClassData {
SMObject* staticFields; /* an array object */
SMFieldDescInfo instFieldDescs;
SMFieldDescInfo weakFieldDescs;
PRUword instanceSize;
SMFinalizeFun finalize;
} SMObjectClassData;
struct SMObjectClass {
SMClassStruct inherit;
SMObjectClassData data;
};
#define SM_CLASS_INSTANCE_SIZE(cl) (((SMClass*)(cl))->object.data.instanceSize)
#define SM_CLASS_FINALIZER(cl) (((SMClass*)(cl))->object.data.finalize)
#define SM_CLASS_IS_FINALIZABLE(cl) (SM_CLASS_FINALIZER(cl) != NULL)
#define SM_CLASS_GET_INST_FIELDS_COUNT(cl) \
(((SMClass*)(cl))->object.data.instFieldDescs.count) \
#define SM_CLASS_GET_INST_FIELD_DESCS(cl) \
SM_CLASS_GET_FIELD_DESCS(cl, &(cl)->object.data.instFieldDescs) \
#define SM_CLASS_GET_WEAK_FIELDS_COUNT(cl) \
(((SMClass*)(cl))->object.data.weakFieldDescs.count) \
#define SM_CLASS_GET_WEAK_FIELD_DESCS(cl) \
SM_CLASS_GET_FIELD_DESCS(cl, &(cl)->object.data.weakFieldDescs) \
/*******************************************************************************
* Array Class Objects
******************************************************************************/
typedef struct SMArrayClassData {
SMClass* elementClass; /* same position as staticFields, above */
} SMArrayClassData;
struct SMArrayClass {
SMClassStruct inherit;
SMArrayClassData data;
};
#define SM_CLASS_ELEMENT_CLASS(cl) (((SMClass*)(cl))->array.data.elementClass)
/*******************************************************************************
* Primitive Class Objects
******************************************************************************/
typedef struct SMPrimClassData {
/* no other fields */
char dummy;
} SMPrimClassData;
struct SMPrimClass {
SMClassStruct inherit;
SMPrimClassData data;
};
/******************************************************************************/
union SMClass {
SMObjectClass object;
SMArrayClass array;
SMPrimClass prim;
};
/* Class structure excluding portion from SMObject: */
typedef struct SMClassData {
PRUword info;
union {
SMObjectClassData object;
SMArrayClassData array;
SMPrimClassData prim;
} type;
} SMClassData;
/******************************************************************************/
#define SM_IS_OBJECT_CLASS(cl) \
(SM_CLASS_KIND(cl) > SMClassKind_ArrayClass) \
#define SM_IS_ARRAY_CLASS(cl) \
(SM_CLASS_KIND(cl) == SMClassKind_ArrayClass) \
#define SM_IS_PRIM_CLASS(cl) \
(SM_CLASS_KIND(cl) < SMClassKind_ArrayClass) \
#define SM_IS_OBJECT_ARRAY_CLASS(cl) \
(SM_CLASS_KIND(cl) == SMClassKind_ArrayClass \
&& !SM_IS_PRIM_CLASS(SM_CLASS_ELEMENT_CLASS(cl))) \
#define SM_IS_PRIMITIVE_ARRAY_CLASS(cl) \
(SM_CLASS_KIND(cl) == SMClassKind_ArrayClass \
&& SM_IS_PRIM_CLASS(SM_CLASS_ELEMENT_CLASS(cl))) \
#define SM_IS_OBJECT(obj) \
(SM_IS_OBJECT_CLASS(SM_OBJECT_CLASS(obj))) \
#define SM_IS_ARRAY(obj) \
(SM_IS_ARRAY_CLASS(SM_OBJECT_CLASS(obj))) \
/******************************************************************************/
SM_EXTERN(void)
SM_InitObjectClass(SMObjectClass* clazz, SMObjectClass* metaClass,
PRUword classSize, PRUword instanceSize,
PRUint16 nInstFieldDescs, PRUint16 nWeakFieldDescs);
SM_EXTERN(void)
SM_InitArrayClass(SMArrayClass* clazz, SMObjectClass* metaClass,
SMClass* elementClass);
SM_EXTERN(void)
SM_InitPrimClass(SMPrimClass* clazz, SMObjectClass* metaClass,
SMClassKind primKind);
/******************************************************************************/
SM_END_EXTERN_C
#endif /* __SMOBJ__ */
/******************************************************************************/
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