1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // This is a simple allocator based on the windows heap.
6
7 extern "C" {
8
9 HANDLE win_heap;
10
win_heap_init(bool use_lfh)11 bool win_heap_init(bool use_lfh) {
12 win_heap = HeapCreate(0, 0, 0);
13 if (win_heap == NULL)
14 return false;
15
16 if (use_lfh) {
17 ULONG enable_lfh = 2;
18 HeapSetInformation(win_heap, HeapCompatibilityInformation,
19 &enable_lfh, sizeof(enable_lfh));
20 // NOTE: Setting LFH may fail. Vista already has it enabled.
21 // And under the debugger, it won't use LFH. So we
22 // ignore any errors.
23 }
24
25 return true;
26 }
27
win_heap_malloc(size_t size)28 void* win_heap_malloc(size_t size) {
29 return HeapAlloc(win_heap, 0, size);
30 }
31
win_heap_free(void * size)32 void win_heap_free(void* size) {
33 HeapFree(win_heap, 0, size);
34 }
35
win_heap_realloc(void * ptr,size_t size)36 void* win_heap_realloc(void* ptr, size_t size) {
37 if (!ptr)
38 return win_heap_malloc(size);
39 if (!size) {
40 win_heap_free(ptr);
41 return NULL;
42 }
43 return HeapReAlloc(win_heap, 0, ptr, size);
44 }
45
win_heap_msize(void * ptr)46 size_t win_heap_msize(void* ptr) {
47 return HeapSize(win_heap, 0, ptr);
48 }
49
50 } // extern "C"
51