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 #ifndef CORE_INCLUDE_FXCRT_FX_MEMORY_H_ 8 #define CORE_INCLUDE_FXCRT_FX_MEMORY_H_ 9 10 #include "fx_system.h" 11 12 #ifdef __cplusplus 13 extern "C" { 14 #endif 15 // For external C libraries to malloc through PDFium. These may return NULL. 16 void* FXMEM_DefaultAlloc(size_t byte_size, int flags); 17 void* FXMEM_DefaultRealloc(void* pointer, size_t new_size, int flags); 18 void FXMEM_DefaultFree(void* pointer, int flags); 19 #ifdef __cplusplus 20 } // extern "C" 21 22 #include <stdlib.h> 23 #include <limits> 24 #include <new> 25 26 NEVER_INLINE void FX_OutOfMemoryTerminate(); 27 28 inline void* FX_SafeRealloc(void* ptr, size_t num_members, size_t member_size) { 29 if (num_members < std::numeric_limits<size_t>::max() / member_size) { 30 return realloc(ptr, num_members * member_size); 31 } 32 return nullptr; 33 } 34 35 inline void* FX_AllocOrDie(size_t num_members, size_t member_size) { 36 // TODO(tsepez): See if we can avoid the implicit memset(0). 37 if (void* result = calloc(num_members, member_size)) { 38 return result; 39 } 40 FX_OutOfMemoryTerminate(); // Never returns. 41 return nullptr; // Suppress compiler warning. 42 } 43 44 inline void* FX_AllocOrDie2D(size_t w, size_t h, size_t member_size) { 45 if (w < std::numeric_limits<size_t>::max() / h) { 46 return FX_AllocOrDie(w * h, member_size); 47 } 48 FX_OutOfMemoryTerminate(); // Never returns. 49 return nullptr; // Suppress compiler warning. 50 } 51 52 inline void* FX_ReallocOrDie(void* ptr, 53 size_t num_members, 54 size_t member_size) { 55 if (void* result = FX_SafeRealloc(ptr, num_members, member_size)) { 56 return result; 57 } 58 FX_OutOfMemoryTerminate(); // Never returns. 59 return nullptr; // Suppress compiler warning. 60 } 61 62 // Never returns NULL. 63 #define FX_Alloc(type, size) (type*) FX_AllocOrDie(size, sizeof(type)) 64 #define FX_Alloc2D(type, w, h) (type*) FX_AllocOrDie2D(w, h, sizeof(type)) 65 #define FX_Realloc(type, ptr, size) \ 66 (type*) FX_ReallocOrDie(ptr, size, sizeof(type)) 67 68 // May return NULL. 69 #define FX_TryAlloc(type, size) (type*) calloc(size, sizeof(type)) 70 #define FX_TryRealloc(type, ptr, size) \ 71 (type*) FX_SafeRealloc(ptr, size, sizeof(type)) 72 73 #define FX_Free(ptr) free(ptr) 74 75 class CFX_DestructObject { 76 public: 77 virtual ~CFX_DestructObject() {} 78 }; 79 class CFX_GrowOnlyPool { 80 public: 81 CFX_GrowOnlyPool(size_t trunk_size = 16384); 82 83 ~CFX_GrowOnlyPool(); 84 85 void SetTrunkSize(size_t trunk_size) { m_TrunkSize = trunk_size; } 86 87 void* AllocDebug(size_t size, const FX_CHAR* file, int line) { 88 return Alloc(size); 89 } 90 91 void* Alloc(size_t size); 92 93 void* ReallocDebug(void* p, size_t new_size, const FX_CHAR* file, int line) { 94 return NULL; 95 } 96 97 void* Realloc(void* p, size_t new_size) { return NULL; } 98 99 void Free(void*) {} 100 101 void FreeAll(); 102 103 private: 104 size_t m_TrunkSize; 105 106 void* m_pFirstTrunk; 107 }; 108 #endif // __cplusplus 109 110 #endif // CORE_INCLUDE_FXCRT_FX_MEMORY_H_ 111
