1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "chpp/memory.h"
18 
19 #include <stdatomic.h>
20 #include <stddef.h>
21 #include <stdlib.h>
22 
23 #ifdef CHPP_LINUX_MEMORY_DEBUG
24 #include "chpp/log.h"
25 #endif  // CHPP_LINUX_MEMORY_DEBUG
26 #include "chpp/macros.h"
27 #include "chpp/platform/utils.h"
28 
29 //! A header used to track the amount of allocated memory.
30 struct ChppAllocHeader {
31   size_t bytes;
32 };
33 
34 static atomic_size_t gTotalAllocBytes = 0;
35 
36 void *chppMalloc(const size_t size) {
37   void *ptr = NULL;
38   if (size != 0) {
39     ptr = malloc(sizeof(struct ChppAllocHeader) + size);
40 
41     if (ptr != NULL) {
42       struct ChppAllocHeader *header = (struct ChppAllocHeader *)ptr;
43       header->bytes = size;
44       header++;
45       ptr = header;
46 
47       gTotalAllocBytes += size;
48     }
49   }
50 
51 #ifdef CHPP_LINUX_MEMORY_DEBUG
52   CHPP_LOGI("%s: size %zu total (after malloc) %zu", __func__, size,
53             gTotalAllocBytes);
54 #endif  // CHPP_LINUX_MEMORY_DEBUG
55 
56   return ptr;
57 }
58 
59 void chppFree(void *ptr) {
60   if (ptr != NULL) {
61     struct ChppAllocHeader *header = (struct ChppAllocHeader *)ptr;
62     header--;
63     size_t size = header->bytes;
64     gTotalAllocBytes -= size;
65 
66 #ifdef CHPP_LINUX_MEMORY_DEBUG
67     CHPP_LOGI("%s: size %zu total (after free) %zu", __func__, size,
68               gTotalAllocBytes);
69 #endif  // CHPP_LINUX_MEMORY_DEBUG
70 
71     free(header);
72   }
73 }
74 
75 void *chppRealloc(void *oldPtr, const size_t newSize, const size_t oldSize) {
76   UNUSED_VAR(oldSize);
77   void *ptr = NULL;
78   if (newSize != oldSize) {
79     struct ChppAllocHeader *oldHeader = (struct ChppAllocHeader *)oldPtr;
80     oldHeader--;
81 
82     void *reallocPtr =
83         realloc(oldHeader, newSize + sizeof(struct ChppAllocHeader));
84     if (reallocPtr != NULL) {
85       struct ChppAllocHeader *newHeader = (struct ChppAllocHeader *)reallocPtr;
86       newHeader->bytes = newSize;
87       newHeader++;
88       ptr = newHeader;
89 
90       if (newSize > oldSize) {
91         gTotalAllocBytes += (newSize - oldSize);
92       } else {
93         gTotalAllocBytes -= (oldSize - newSize);
94       }
95     }
96   }
97 
98 #ifdef CHPP_LINUX_MEMORY_DEBUG
99   CHPP_LOGI("%s: size %zu total (after realloc) %zu", __func__, newSize,
100             gTotalAllocBytes);
101 #endif  // CHPP_LINUX_MEMORY_DEBUG
102 
103   return ptr;
104 }
105 
106 void chppClearTotalAllocBytes() {
107   gTotalAllocBytes = 0;
108 }
109 
110 size_t chppGetTotalAllocBytes() {
111   return gTotalAllocBytes;
112 }
113