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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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extern PRLogModuleInfo* _pr_msgc_lm;
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#define GC_VMBASE 0x40000000
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#define GC_VMLIMIT 0x00FFFFFF
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/************************************************************************/
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** Machine dependent GC Heap management routines:
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/************************************************************************/
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void *baseaddr = (void*) GC_VMBASE;
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void *lastaddr = (void*) GC_VMBASE;
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void *_MD_GrowGCHeap(PRUint32 *sizep)
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/* Reserve a block of memory for the GC */
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if( lastaddr == baseaddr ) {
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addr = VirtualAlloc( (void *)GC_VMBASE, GC_VMLIMIT, MEM_RESERVE, PAGE_READWRITE );
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** If the GC_VMBASE address is already mapped, then let the OS choose a
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** base address that is available...
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addr = VirtualAlloc( NULL, GC_VMLIMIT, MEM_RESERVE, PAGE_READWRITE );
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baseaddr = lastaddr = addr;
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PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS, ("GC: unable to allocate heap: LastError=%ld",
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/* Extend the mapping */
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addr = VirtualAlloc( lastaddr, size, MEM_COMMIT, PAGE_READWRITE );
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lastaddr = ((char*)addr + size);
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PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS,
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("GC: heap extends from %08x to %08x",
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baseaddr, (long)baseaddr + (char*)lastaddr - (char*)baseaddr));
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PRBool _MD_ExtendGCHeap(char *base, PRInt32 oldSize, PRInt32 newSize) {
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addr = VirtualAlloc( base + oldSize, newSize - oldSize,
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MEM_COMMIT, PAGE_READWRITE );
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PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS, ("GC: unable to extend heap: LastError=%ld",
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if (base + oldSize != (char*)addr) {
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PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS, ("GC: segment extension returned %x instead of %x",
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addr, base + oldSize));
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VirtualFree(addr, newSize - oldSize, MEM_DECOMMIT);
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lastaddr = base + newSize;
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PR_LOG(_pr_msgc_lm, PR_LOG_ALWAYS,
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("GC: heap now extends from %p to %p",
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base, base + newSize));
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void _MD_FreeGCSegment(void *base, PRInt32 len)
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(void)VirtualFree(base, 0, MEM_RELEASE);