* ---------------------------------------------------------------------------*/
#include "Rts.h"
-#include "OSMem.h"
+#include "sm/OSMem.h"
#include "RtsUtils.h"
-#include "RtsMessages.h"
#if HAVE_WINDOWS_H
#include <windows.h>
#endif
-/* alloc_rec keeps the info we need to have matching VirtualAlloc and
- VirtualFree calls.
-*/
typedef struct alloc_rec_ {
char* base; /* non-aligned base address, directly from VirtualAlloc */
int size; /* Size in bytes */
struct block_rec_* next;
} block_rec;
+/* allocs are kept in ascending order, and are the memory regions as
+ returned by the OS as we need to have matching VirtualAlloc and
+ VirtualFree calls. */
static alloc_rec* allocs = NULL;
+
+/* free_blocks are kept in ascending order, and adjacent blocks are merged */
static block_rec* free_blocks = NULL;
void
alloc_rec* rec;
rec = (alloc_rec*)stgMallocBytes(sizeof(alloc_rec),"getMBlocks: allocNew");
rec->size = (n+1)*MBLOCK_SIZE;
- rec->base =
+ rec->base =
VirtualAlloc(NULL, rec->size, MEM_RESERVE, PAGE_READWRITE);
if(rec->base==0) {
stgFree((void*)rec);
"getMBlocks: VirtualAlloc MEM_RESERVE %d blocks failed", n);
}
} else {
- alloc_rec temp;
- temp.base=0; temp.size=0; temp.next=allocs;
+ alloc_rec temp;
+ temp.base=0; temp.size=0; temp.next=allocs;
alloc_rec* it;
it=&temp;
rec->next=it->next;
it->next=rec;
- allocs=temp.next;
+ allocs=temp.next;
}
return rec;
}
temp = VirtualAlloc(base, size_delta, MEM_COMMIT, PAGE_READWRITE);
if(temp==0) {
sysErrorBelch("getMBlocks: VirtualAlloc MEM_COMMIT failed");
- stg_exit(EXIT_FAILURE);
- }
+ stg_exit(EXIT_FAILURE);
+ }
size-=size_delta;
base+=size_delta;
}
alloc_rec* alloc;
alloc = allocNew(n);
/* We already belch in allocNew if it fails */
- if (alloc == 0) {
- stg_exit(EXIT_FAILURE);
- } else {
+ if (alloc == 0) {
+ stg_exit(EXIT_FAILURE);
+ } else {
insertFree(alloc->base, alloc->size);
ret = findFreeBlocks(n);
- }
+ }
}
if(ret!=0) {
return ret;
}
+void osFreeMBlocks(char *addr, nat n)
+{
+ alloc_rec *p;
+ lnat nBytes = (lnat)n * MBLOCK_SIZE;
+
+ insertFree(addr, nBytes);
+
+ p = allocs;
+ while ((p != NULL) && (addr >= (p->base + p->size))) {
+ p = p->next;
+ }
+ while (nBytes > 0) {
+ if ((p == NULL) || (p->base > addr)) {
+ errorBelch("Memory to be freed isn't allocated\n");
+ stg_exit(EXIT_FAILURE);
+ }
+ if (p->base + p->size >= addr + nBytes) {
+ if (!VirtualFree(addr, nBytes, MEM_DECOMMIT)) {
+ sysErrorBelch("osFreeMBlocks: VirtualFree MEM_DECOMMIT failed");
+ stg_exit(EXIT_FAILURE);
+ }
+ nBytes = 0;
+ }
+ else {
+ lnat bytesToFree = p->base + p->size - addr;
+ if (!VirtualFree(addr, bytesToFree, MEM_DECOMMIT)) {
+ sysErrorBelch("osFreeMBlocks: VirtualFree MEM_DECOMMIT failed");
+ stg_exit(EXIT_FAILURE);
+ }
+ addr += bytesToFree;
+ nBytes -= bytesToFree;
+ p = p->next;
+ }
+ }
+}
+
+void osReleaseFreeMemory(void)
+{
+ alloc_rec *prev_a, *a;
+ alloc_rec head_a;
+ block_rec *prev_fb, *fb;
+ block_rec head_fb;
+ char *a_end, *fb_end;
+
+ /* go through allocs and free_blocks in lockstep, looking for allocs
+ that are completely free, and uncommit them */
+
+ head_a.base = 0;
+ head_a.size = 0;
+ head_a.next = allocs;
+ head_fb.base = 0;
+ head_fb.size = 0;
+ head_fb.next = free_blocks;
+ prev_a = &head_a;
+ a = allocs;
+ prev_fb = &head_fb;
+ fb = free_blocks;
+
+ while (a != NULL) {
+ a_end = a->base + a->size;
+ /* If a is freeable then there is a single freeblock in fb that
+ covers it. The end of this free block must be >= the end of
+ a, so skip anything in fb that ends before a. */
+ while (fb != NULL && fb->base + fb->size < a_end) {
+ prev_fb = fb;
+ fb = fb->next;
+ }
+
+ if (fb == NULL) {
+ /* If we have nothing left in fb, then neither a nor
+ anything later in the list is freeable, so we are done. */
+ break;
+ }
+ else {
+ fb_end = fb->base + fb->size;
+ /* We have a candidate fb. But does it really cover a? */
+ if (fb->base <= a->base) {
+ /* Yes, the alloc is within the free block. Now we need
+ to know if it sticks out at either end. */
+ if (fb_end == a_end) {
+ if (fb->base == a->base) {
+ /* fb and a are identical, so just free fb */
+ prev_fb->next = fb->next;
+ stgFree(fb);
+ fb = prev_fb->next;
+ }
+ else {
+ /* fb begins earlier, so truncate it to not include a */
+ fb->size = a->base - fb->base;
+ }
+ }
+ else {
+ /* fb ends later, so we'll make fb just be the part
+ after a. First though, if it also starts earlier,
+ we make a new free block record for the before bit. */
+ if (fb->base != a->base) {
+ block_rec *new_fb;
+
+ new_fb = (block_rec *)stgMallocBytes(sizeof(block_rec),"osReleaseFreeMemory");
+ new_fb->base = fb->base;
+ new_fb->size = a->base - fb->base;
+ new_fb->next = fb;
+ prev_fb->next = new_fb;
+ }
+ fb->size = fb_end - a_end;
+ fb->base = a_end;
+ }
+ /* Now we can free the alloc */
+ prev_a->next = a->next;
+ if(!VirtualFree((void *)a->base, 0, MEM_RELEASE)) {
+ sysErrorBelch("freeAllMBlocks: VirtualFree MEM_RELEASE failed");
+ stg_exit(EXIT_FAILURE);
+ }
+ stgFree(a);
+ a = prev_a->next;
+ }
+ else {
+ /* Otherwise this alloc is not freeable, so go on to the
+ next one */
+ prev_a = a;
+ a = a->next;
+ }
+ }
+ }
+
+ allocs = head_a.next;
+ free_blocks = head_fb.next;
+}
+
void
osFreeAllMBlocks(void)
{
for(; it!=0; ) {
if(!VirtualFree((void*)it->base, 0, MEM_RELEASE)) {
sysErrorBelch("freeAllMBlocks: VirtualFree MEM_RELEASE failed");
- stg_exit(EXIT_FAILURE);
+ stg_exit(EXIT_FAILURE);
}
next = it->next;
stgFree(it);
{
static lnat pagesize = 0;
if (pagesize) {
- return pagesize;
+ return pagesize;
} else {
- SYSTEM_INFO sSysInfo;
- GetSystemInfo(&sSysInfo);
- pagesize = sSysInfo.dwPageSize;
- return pagesize;
+ SYSTEM_INFO sSysInfo;
+ GetSystemInfo(&sSysInfo);
+ pagesize = sSysInfo.dwPageSize;
+ return pagesize;
}
}
void setExecutable (void *p, lnat len, rtsBool exec)
{
DWORD dwOldProtect = 0;
- if (VirtualProtect (p, len,
- exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE,
- &dwOldProtect) == 0)
+ if (VirtualProtect (p, len,
+ exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE,
+ &dwOldProtect) == 0)
{
- sysErrorBelch("setExecutable: failed to protect 0x%p; old protection: %lu\n",
+ sysErrorBelch("setExecutable: failed to protect 0x%p; old protection: %lu\n",
p, (unsigned long)dwOldProtect);
stg_exit(EXIT_FAILURE);
}
projects / ghc-hetmet.git / blobdiff