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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* The Original Code is the Netscape Portable Runtime (NSPR).
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/*
* 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);
}