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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* The Original Code is the Netscape Portable Runtime (NSPR).
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998-2000
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* the Initial Developer. All Rights Reserved.
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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* ***** END LICENSE BLOCK ***** */
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** API to NSPR gc memory system.
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** Initialize the garbage collector.
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** "flags" is the trace flags (see below).
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** "initialHeapSize" is the initial size of the heap and may be zero
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** if the default is desired.
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** "segmentSize" is the size of each segment of memory added to the
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** heap when the heap is grown.
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PR_EXTERN(void) PR_InitGC(
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PRWord flags, PRInt32 initialHeapSize, PRInt32 segmentSize, PRThreadScope scope);
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** Shuts down gc and frees up all memory associated with it.
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PR_EXTERN(void) PR_ShutdownGC(PRBool finalizeOnExit);
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** This walk function will be called for every gc object in the
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** heap as it is walked. If it returns non-zero, the walk is terminated.
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typedef PRInt32 (*PRWalkFun)(void GCPTR* obj, void* data);
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** GC Type record. This defines all of the GC operations used on a
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** particular object type. These structures are passed to
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typedef struct GCType {
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** Scan an object that is in the GC heap and call GCInfo.livePointer
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** on all of the pointers in it. If this slot is null then the object
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** won't be scanned (i.e. it has no embedded pointers).
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void (PR_CALLBACK *scan)(void GCPTR *obj);
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** Finalize an object that has no references. This is called by the
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** GC after it has determined where the object debris is but before
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** it has moved the debris to the logical "free list". The object is
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** marked alive for this call and removed from the list of objects
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** that need finalization (finalization only happens once for an
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** object). If this slot is null then the object doesn't need
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void (PR_CALLBACK *finalize)(void GCPTR *obj);
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** Dump out an object during a PR_DumpGCHeap(). This is used as a
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void (PR_CALLBACK *dump)(FILE *out, void GCPTR *obj, PRBool detailed, PRIntn indentLevel);
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** Add object to summary table.
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void (PR_CALLBACK *summarize)(void GCPTR *obj, PRUint32 bytes);
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** Free hook called by GC when the object is being freed.
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void (PR_CALLBACK *free)(void *obj);
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/* Weak pointer support: If the object has a weak pointer (Note:
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at most one), this function is used to get the weak link's
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offset from the start of the body of a gc object */
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PRUint32 (PR_CALLBACK *getWeakLinkOffset)(void *obj);
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/* Descriptive character for dumping this GCType */
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** Walker routine. This routine should apply fun(obj->ptr, data)
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** for every gc pointer within the object.
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PRInt32 (PR_CALLBACK *walk)(void GCPTR *obj, PRWalkFun fun, void* data);
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** This data structure must be added as the hash table passed to
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** the summarize method of GCType.
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typedef struct PRSummaryEntry {
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PRInt32 instancesCount;
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** This function pointer must be registered by users of nspr
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** to produce the finally summary after all object in the
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** heap have been visited.
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typedef void (PR_CALLBACK *PRSummaryPrinter)(FILE *out, void* closure);
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PR_EXTERN(void) PR_CALLBACK PR_RegisterSummaryPrinter(PRSummaryPrinter fun, void* closure);
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typedef void PR_CALLBACK GCRootFinder(void *arg);
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typedef void PR_CALLBACK GCBeginFinalizeHook(void *arg);
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typedef void PR_CALLBACK GCEndFinalizeHook(void *arg);
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typedef void PR_CALLBACK GCBeginGCHook(void *arg);
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typedef void PR_CALLBACK GCEndGCHook(void *arg);
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typedef enum { PR_GCBEGIN, PR_GCEND } GCLockHookArg;
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typedef void PR_CALLBACK GCLockHookFunc(GCLockHookArg arg1, void *arg2);
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typedef struct GCLockHook GCLockHook;
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GCLockHookFunc* func;
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** Hooks which are called at the beginning and end of the GC process.
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** The begin hooks are called before the root finding step. The hooks are
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** called with threading disabled, so it is now allowed to re-enter the
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** kernel. The end hooks are called after the gc has finished but before
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** the finalizer has run.
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PR_EXTERN(void) PR_CALLBACK PR_SetBeginGCHook(GCBeginGCHook *hook, void *arg);
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PR_EXTERN(void) PR_CALLBACK PR_GetBeginGCHook(GCBeginGCHook **hook, void **arg);
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PR_EXTERN(void) PR_CALLBACK PR_SetEndGCHook(GCBeginGCHook *hook, void *arg);
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PR_EXTERN(void) PR_CALLBACK PR_GetEndGCHook(GCEndGCHook **hook, void **arg);
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** Called before SuspendAll is called by dogc, so that GC thread can hold
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** all the locks before hand to avoid any deadlocks
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PR_EXTERN(void) PR_SetGCLockHook(GCLockHook *hook, void *arg);
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PR_EXTERN(void) PR_GetGCLockHook(GCLockHook **hook, void **arg);
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PR_EXTERN(int) PR_RegisterGCLockHook(GCLockHookFunc *hook, void *arg);
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** Hooks which are called at the beginning and end of the GC finalization
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** process. After the GC has identified all of the dead objects in the
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** heap, it looks for objects that need finalization. Before it calls the
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** first finalization proc (see the GCType structure above) it calls the
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** begin hook. When it has finalized the last object it calls the end
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PR_EXTERN(void) PR_SetBeginFinalizeHook(GCBeginFinalizeHook *hook, void *arg);
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PR_EXTERN(void) PR_GetBeginFinalizeHook(GCBeginFinalizeHook **hook, void **arg);
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PR_EXTERN(void) PR_SetEndFinalizeHook(GCBeginFinalizeHook *hook, void *arg);
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PR_EXTERN(void) PR_GetEndFinalizeHook(GCEndFinalizeHook **hook, void **arg);
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** Register a GC type. Return's the index into the GC internal type
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** table. The returned value is passed to PR_AllocMemory. After the call,
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** the "type" memory belongs to the GC (the caller must not free it or
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PR_EXTERN(PRInt32) PR_RegisterType(GCType *type);
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** Register a root finder with the collector. The collector will call
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** these functions to identify all of the roots before collection
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** proceeds. "arg" is passed to the function when it is called.
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PR_EXTERN(PRStatus) PR_RegisterRootFinder(GCRootFinder func, char *name, void *arg);
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** Allocate some GC'able memory. The object must be at least bytes in
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** size. The type index function for the object is specified. "flags"
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** specifies some control flags. If PR_ALLOC_CLEAN is set then the memory
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** is zero'd before being returned. If PR_ALLOC_DOUBLE is set then the
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** allocated memory is double aligned.
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** Any memory cell that you store a pointer to something allocated by
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** this call must be findable by the GC. Use the PR_RegisterRootFinder to
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** register new places where the GC will look for pointers into the heap.
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** The GC already knows how to scan any NSPR threads or monitors.
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PR_EXTERN(PRWord GCPTR *)PR_AllocMemory(
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PRWord bytes, PRInt32 typeIndex, PRWord flags);
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PR_EXTERN(PRWord GCPTR *)PR_AllocSimpleMemory(
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PRWord bytes, PRInt32 typeIndex);
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** This function can be used to cause PR_AllocMemory to always return
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** NULL. This may be useful in low memory situations when we're trying to
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PR_EXTERN(void) PR_EnableAllocation(PRBool yesOrNo);
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#define PR_ALLOC_CLEAN 0x1
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#define PR_ALLOC_DOUBLE 0x2
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#define PR_ALLOC_ZERO_HANDLE 0x4 /* XXX yes, it's a hack */
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** Force a garbage collection right now. Return when it completes.
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PR_EXTERN(void) PR_GC(void);
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** Force a finalization right now. Return when finalization has
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** completed. Finalization completes when there are no more objects
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** pending finalization. This does not mean there are no objects in the
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** gc heap that will need finalization should a collection be done after
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PR_EXTERN(void) PR_ForceFinalize(void);
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** Dump the GC heap out to the given file. This will stop the system dead
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** in its tracks while it is occuring.
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PR_EXTERN(void) PR_DumpGCHeap(FILE *out, PRBool detailed);
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** Wrapper for PR_DumpGCHeap
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PR_EXTERN(void) PR_DumpMemory(PRBool detailed);
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** Dump summary of objects allocated.
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PR_EXTERN(void) PR_DumpMemorySummary(void);
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** Dump the application heaps.
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PR_EXTERN(void) PR_DumpApplicationHeaps(void);
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** Helper function used by dump routines to do the indentation in a
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** consistent fashion.
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PR_EXTERN(void) PR_DumpIndent(FILE *out, PRIntn indent);
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** The GCInfo structure contains all of the GC state...
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** The amount of GC heap memory that is busy at this instant. Busy
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** doesn't mean alive, it just means that it has been
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** allocated. Immediately after a collection busy means how much is
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** The amount of GC heap memory that is as yet unallocated.
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** The sum of free and busy memory in the GC heap.
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** The maximum size that the GC heap is allowed to grow.
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** The lowest segment currently used in the GC heap.
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** The highest segment currently used in the GC heap.
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** The lowSeg and highSeg members are used for a "quick test" of whether
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** a pointer falls within the GC heap. [ see GC_IN_HEAP(...) ]
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** Monitor used for synchronization within the GC.
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** Thread in which the GC finalizer is running.
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** Object scanning functions call through this function pointer to
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** register a potential block of pointers with the collector. (This is
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** currently not at all different than processRoot.)
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** Object scanning functions call through this function pointer to
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** register a single pointer with the collector.
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** When a root finder identifies a root it should call through this
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** function pointer so that the GC can process the root. The call takes
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** a base address and count which the gc will examine for valid heap
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** processRootPointer:
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** When a root finder identifies a root it should call through this
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** function pointer so that the GC can process the root. The call takes
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** a single pointer value.
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typedef struct GCInfoStr {
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PRWord flags; /* trace flags (see below) */
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PRWord busyMemory; /* memory in use right now */
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PRWord freeMemory; /* memory free right now */
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PRWord allocMemory; /* sum of busy & free memory */
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PRWord maxMemory; /* max memory we are allowed to allocate */
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PRWord *lowSeg; /* lowest segment in the GC heap */
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PRWord *highSeg; /* highest segment in the GC heap */
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void (PR_CALLBACK *liveBlock)(void **base, PRInt32 count);
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void (PR_CALLBACK *livePointer)(void *ptr);
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void (PR_CALLBACK *processRootBlock)(void **base, PRInt32 count);
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void (PR_CALLBACK *processRootPointer)(void *ptr);
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void (*gcTimingHook)(int32 gcTime);
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PR_EXTERN(GCInfo *) PR_GetGCInfo(void);
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PR_EXTERN(PRBool) PR_GC_In_Heap(void GCPTR *object);
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** Simple bounds check to see if a pointer is anywhere near the GC heap.
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** Used to avoid calls to PR_ProcessRoot and GCInfo.livePointer by object
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#if !defined(XP_PC) || defined(_WIN32)
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#define GC_IN_HEAP(_info, _p) (((PRWord*)(_p) >= (_info)->lowSeg) && \
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((PRWord*)(_p) < (_info)->highSeg))
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** The simple bounds check, above, doesn't work in Win16, because we don't
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** maintain: lowSeg == MIN(all segments) and highSeg == MAX(all segments).
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** So we have to do a little better.
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#define GC_IN_HEAP(_info, _p) PR_GC_In_Heap(_p)
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PR_EXTERN(PRWord) PR_GetObjectHeader(void *ptr);
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PR_EXTERN(PRWord) PR_SetObjectHeader(void *ptr, PRWord newUserBits);
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/************************************************************************/
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/* Trace flags (passed to PR_InitGC or in environment GCLOG) */
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#define GC_TRACE 0x0001
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#define GC_ROOTS 0x0002
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#define GC_LIVE 0x0004
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#define GC_ALLOC 0x0008
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#define GC_MARK 0x0010
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#define GC_SWEEP 0x0020
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#define GC_DEBUG 0x0040
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#define GC_FINAL 0x0080
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#if defined(DEBUG_kipp) || defined(DEBUG_warren)
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#define GC_CHECK 0x0100
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#define GCTRACE(x, y) if (PR_GetGCInfo()->flags & x) GCTrace y
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PR_EXTERN(void) GCTrace(char *fmt, ...);
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#define GCTRACE(x, y)
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#endif /* prgc_h___ */
added
removed
mozilla/nsprpub/lib/msgc/include/prgc.h
