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 11 void* FXMEM_DefaultAlloc(size_t byte_size, int flags) { 12 return (void*)malloc(byte_size); 13 } 14 void* FXMEM_DefaultRealloc(void* pointer, size_t new_size, int flags) { 15 return realloc(pointer, new_size); 16 } 17 void FXMEM_DefaultFree(void* pointer, int flags) { 18 free(pointer); 19 } 20 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 27 CFX_GrowOnlyPool::CFX_GrowOnlyPool(size_t trunk_size) { 28 m_TrunkSize = trunk_size; 29 m_pFirstTrunk = NULL; 30 } 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 }; 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 } 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
