1 // Copyright 2014 PDFium 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 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6
7 #include <stdlib.h> // For abort().
8
9 #include "core/include/fxcrt/fx_memory.h"
10
FXMEM_DefaultAlloc(size_t byte_size,int flags)11 void* FXMEM_DefaultAlloc(size_t byte_size, int flags) {
12 return (void*)malloc(byte_size);
13 }
FXMEM_DefaultRealloc(void * pointer,size_t new_size,int flags)14 void* FXMEM_DefaultRealloc(void* pointer, size_t new_size, int flags) {
15 return realloc(pointer, new_size);
16 }
FXMEM_DefaultFree(void * pointer,int flags)17 void FXMEM_DefaultFree(void* pointer, int flags) {
18 free(pointer);
19 }
20
FX_OutOfMemoryTerminate()21 NEVER_INLINE void FX_OutOfMemoryTerminate() {
22 // Termimate cleanly if we can, else crash at a specific address (0xbd).
23 abort();
24 reinterpret_cast<void (*)()>(0xbd)();
25 }
26
CFX_GrowOnlyPool(size_t trunk_size)27 CFX_GrowOnlyPool::CFX_GrowOnlyPool(size_t trunk_size) {
28 m_TrunkSize = trunk_size;
29 m_pFirstTrunk = NULL;
30 }
~CFX_GrowOnlyPool()31 CFX_GrowOnlyPool::~CFX_GrowOnlyPool() {
32 FreeAll();
33 }
34 struct _FX_GrowOnlyTrunk {
35 size_t m_Size;
36 size_t m_Allocated;
37 _FX_GrowOnlyTrunk* m_pNext;
38 };
FreeAll()39 void CFX_GrowOnlyPool::FreeAll() {
40 _FX_GrowOnlyTrunk* pTrunk = (_FX_GrowOnlyTrunk*)m_pFirstTrunk;
41 while (pTrunk) {
42 _FX_GrowOnlyTrunk* pNext = pTrunk->m_pNext;
43 FX_Free(pTrunk);
44 pTrunk = pNext;
45 }
46 m_pFirstTrunk = NULL;
47 }
Alloc(size_t size)48 void* CFX_GrowOnlyPool::Alloc(size_t size) {
49 size = (size + 3) / 4 * 4;
50 _FX_GrowOnlyTrunk* pTrunk = (_FX_GrowOnlyTrunk*)m_pFirstTrunk;
51 while (pTrunk) {
52 if (pTrunk->m_Size - pTrunk->m_Allocated >= size) {
53 void* p = (uint8_t*)(pTrunk + 1) + pTrunk->m_Allocated;
54 pTrunk->m_Allocated += size;
55 return p;
56 }
57 pTrunk = pTrunk->m_pNext;
58 }
59 size_t alloc_size = size > m_TrunkSize ? size : m_TrunkSize;
60 pTrunk = (_FX_GrowOnlyTrunk*)FX_Alloc(uint8_t,
61 sizeof(_FX_GrowOnlyTrunk) + alloc_size);
62 pTrunk->m_Size = alloc_size;
63 pTrunk->m_Allocated = size;
64 pTrunk->m_pNext = (_FX_GrowOnlyTrunk*)m_pFirstTrunk;
65 m_pFirstTrunk = pTrunk;
66 return pTrunk + 1;
67 }
68