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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 the Netscape Portable Runtime (NSPR).
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* GC related routines
*
*/
#include <windows.h>
#include "prlog.h"
extern PRLogModuleInfo* _pr_msgc_lm;
#define GC_VMBASE 0x40000000
#define GC_VMLIMIT 0x00FFFFFF
/************************************************************************/
/*
** Machine dependent GC Heap management routines:
** _MD_GrowGCHeap
*/
/************************************************************************/
void *baseaddr = (void*) GC_VMBASE;
void *lastaddr = (void*) GC_VMBASE;
void _MD_InitGC() {}
void *_MD_GrowGCHeap(PRUint32 *sizep)
{
void *addr;
size_t size;
/* Reserve a block of memory for the GC */
if( lastaddr == baseaddr ) {
addr = VirtualAlloc( (void *)GC_VMBASE, GC_VMLIMIT, MEM_RESERVE, PAGE_READWRITE );
/*
** If the GC_VMBASE address is already mapped, then let the OS choose a
** base address that is available...
*/
if (addr == NULL) {
addr = VirtualAlloc( NULL, GC_VMLIMIT, MEM_RESERVE, PAGE_READWRITE );
baseaddr = lastaddr = addr;
if (addr == NULL) {
PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS, ("GC: unable to allocate heap: LastError=%ld",
GetLastError()));
return 0;
}
}
}
size = *sizep;
/* Extend the mapping */
addr = VirtualAlloc( lastaddr, size, MEM_COMMIT, PAGE_READWRITE );
if (addr == NULL) {
return 0;
}
lastaddr = ((char*)addr + size);
PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS,
("GC: heap extends from %08x to %08x",
baseaddr, (long)baseaddr + (char*)lastaddr - (char*)baseaddr));
return addr;
}
PRBool _MD_ExtendGCHeap(char *base, PRInt32 oldSize, PRInt32 newSize) {
void* addr;
addr = VirtualAlloc( base + oldSize, newSize - oldSize,
MEM_COMMIT, PAGE_READWRITE );
if (NULL == addr) {
PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS, ("GC: unable to extend heap: LastError=%ld",
GetLastError()));
return PR_FALSE;
}
if (base + oldSize != (char*)addr) {
PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS, ("GC: segment extension returned %x instead of %x",
addr, base + oldSize));
VirtualFree(addr, newSize - oldSize, MEM_DECOMMIT);
return PR_FALSE;
}
lastaddr = base + newSize;
PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS,
("GC: heap now extends from %p to %p",
base, base + newSize));
return PR_TRUE;
}
void _MD_FreeGCSegment(void *base, PRInt32 len)
{
(void)VirtualFree(base, 0, MEM_RELEASE);
}
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