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
FX_SafeRealloc(void * ptr,size_t num_members,size_t member_size)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
FX_AllocOrDie(size_t num_members,size_t member_size)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
FX_AllocOrDie2D(size_t w,size_t h,size_t member_size)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
FX_ReallocOrDie(void * ptr,size_t num_members,size_t member_size)52 inline void* FX_ReallocOrDie(void* ptr, size_t num_members, size_t member_size) {
53 if (void* result = FX_SafeRealloc(ptr, num_members, member_size)) {
54 return result;
55 }
56 FX_OutOfMemoryTerminate(); // Never returns.
57 return nullptr; // Suppress compiler warning.
58 }
59
60 // Never returns NULL.
61 #define FX_Alloc(type, size) (type*)FX_AllocOrDie(size, sizeof(type))
62 #define FX_Alloc2D(type, w, h) (type*)FX_AllocOrDie2D(w, h, sizeof(type))
63 #define FX_Realloc(type, ptr, size) \
64 (type*)FX_ReallocOrDie(ptr, size, sizeof(type))
65
66 // May return NULL.
67 #define FX_TryAlloc(type, size) (type*)calloc(size, sizeof(type))
68 #define FX_TryRealloc(type, ptr, size) \
69 (type*)FX_SafeRealloc(ptr, size, sizeof(type))
70
71 #define FX_Free(ptr) free(ptr)
72
73 class CFX_DestructObject
74 {
75 public:
76
~CFX_DestructObject()77 virtual ~CFX_DestructObject() {}
78 };
79 class CFX_GrowOnlyPool
80 {
81 public:
82
83 CFX_GrowOnlyPool(size_t trunk_size = 16384);
84
85 ~CFX_GrowOnlyPool();
86
SetTrunkSize(size_t trunk_size)87 void SetTrunkSize(size_t trunk_size)
88 {
89 m_TrunkSize = trunk_size;
90 }
91
AllocDebug(size_t size,FX_LPCSTR file,int line)92 void* AllocDebug(size_t size, FX_LPCSTR file, int line)
93 {
94 return Alloc(size);
95 }
96
97 void* Alloc(size_t size);
98
ReallocDebug(void * p,size_t new_size,FX_LPCSTR file,int line)99 void* ReallocDebug(void* p, size_t new_size, FX_LPCSTR file, int line)
100 {
101 return NULL;
102 }
103
Realloc(void * p,size_t new_size)104 void* Realloc(void* p, size_t new_size)
105 {
106 return NULL;
107 }
108
Free(void *)109 void Free(void*) {}
110
111 void FreeAll();
112 private:
113
114 size_t m_TrunkSize;
115
116 void* m_pFirstTrunk;
117 };
118 #endif // __cplusplus
119
120 #endif // CORE_INCLUDE_FXCRT_FX_MEMORY_H_
121