malloc.c 2.56 KB
Newer Older
Damien's avatar
Damien committed
1
2
#include <stdio.h>
#include <stdlib.h>
Paul Sokolovsky's avatar
Paul Sokolovsky committed
3
#include <string.h>
Damien's avatar
Damien committed
4
5

#include "misc.h"
6
#include "mpconfig.h"
Damien's avatar
Damien committed
7

8
9
10
11
12
13
#if 0 // print debugging info
#define DEBUG_printf(args...) printf(args)
#else // don't print debugging info
#define DEBUG_printf(args...) (void)0
#endif

14
#if MICROPY_MEM_STATS
Damien's avatar
Damien committed
15
static int total_bytes_allocated = 0;
16
static int current_bytes_allocated = 0;
17
18
19
static int peak_bytes_allocated = 0;

#define UPDATE_PEAK() { if (current_bytes_allocated > peak_bytes_allocated) peak_bytes_allocated = current_bytes_allocated; }
20
#endif
Damien's avatar
Damien committed
21
22
23
24
25
26
27
28
29
30

void *m_malloc(int num_bytes) {
    if (num_bytes == 0) {
        return NULL;
    }
    void *ptr = malloc(num_bytes);
    if (ptr == NULL) {
        printf("could not allocate memory, allocating %d bytes\n", num_bytes);
        return NULL;
    }
31
#if MICROPY_MEM_STATS
Damien's avatar
Damien committed
32
    total_bytes_allocated += num_bytes;
33
    current_bytes_allocated += num_bytes;
34
    UPDATE_PEAK();
35
#endif
36
    DEBUG_printf("malloc %d : %p\n", num_bytes, ptr);
Damien's avatar
Damien committed
37
38
39
40
    return ptr;
}

void *m_malloc0(int num_bytes) {
Paul Sokolovsky's avatar
Paul Sokolovsky committed
41
42
43
    void *ptr = m_malloc(num_bytes);
    if (ptr != NULL) {
        memset(ptr, 0, num_bytes);
Damien's avatar
Damien committed
44
45
46
47
    }
    return ptr;
}

48
49
void *m_realloc(void *ptr, int old_num_bytes, int new_num_bytes) {
    if (new_num_bytes == 0) {
Damien's avatar
Damien committed
50
51
52
        free(ptr);
        return NULL;
    }
53
54
    void *new_ptr = realloc(ptr, new_num_bytes);
    if (new_ptr == NULL) {
55
        printf("could not allocate memory, reallocating %d bytes\n", new_num_bytes);
Damien's avatar
Damien committed
56
57
        return NULL;
    }
58
#if MICROPY_MEM_STATS
59
60
61
62
63
    // At first thought, "Total bytes allocated" should only grow,
    // after all, it's *total*. But consider for example 2K block
    // shrunk to 1K and then grown to 2K again. It's still 2K
    // allocated total. If we process only positive increments,
    // we'll count 3K.
64
65
66
    int diff = new_num_bytes - old_num_bytes;
    total_bytes_allocated += diff;
    current_bytes_allocated += diff;
67
    UPDATE_PEAK();
68
#endif
69
70
    DEBUG_printf("realloc %p, %d, %d : %p\n", ptr, old_num_bytes, new_num_bytes, new_ptr);
    return new_ptr;
Damien's avatar
Damien committed
71
72
}

73
74
75
76
void m_free(void *ptr, int num_bytes) {
    if (ptr != NULL) {
        free(ptr);
    }
77
#if MICROPY_MEM_STATS
78
    current_bytes_allocated -= num_bytes;
79
#endif
80
    DEBUG_printf("free %p, %d\n", ptr, num_bytes);
81
82
}

83
int m_get_total_bytes_allocated(void) {
84
#if MICROPY_MEM_STATS
Damien's avatar
Damien committed
85
    return total_bytes_allocated;
86
87
88
#else
    return -1;
#endif
Damien's avatar
Damien committed
89
}
90
91

int m_get_current_bytes_allocated(void) {
92
#if MICROPY_MEM_STATS
93
    return current_bytes_allocated;
94
95
96
#else
    return -1;
#endif
97
}
98
99

int m_get_peak_bytes_allocated(void) {
100
#if MICROPY_MEM_STATS
101
    return peak_bytes_allocated;
102
103
104
#else
    return -1;
#endif
105
}