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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998-2000 Netscape Communications Corporation. All
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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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);