1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
#include "teensy_mem.h"
#include <string.h>
#include "teensy_common.h"
#include "teensy_list.h"
#define ARENA_DEFAULT_HUNK_SIZE (1<<16) // ~65KB
Arena temp_arena;
static
Arena_Hunk *create_new_hunk(size_t hunk_size)
{
Arena_Hunk *hunk = ty_new(Arena_Hunk);
memset(hunk, 0, sizeof(Arena_Hunk));
hunk->start = ty_alloc(hunk_size);
hunk->end = hunk->start + hunk_size;
hunk->head = hunk->start;
return hunk;
}
void *ty_arena_alloc(Arena *arena, size_t size)
{
Arena_Hunk *hunk = arena->hunks;
while (hunk) {
if (hunk->head + size < hunk->end)
break;
hunk = hunk->next;
}
if (!hunk) {
// I like these lines
arena->hunk_size = arena->hunk_size
? arena->hunk_size : ARENA_DEFAULT_HUNK_SIZE;
hunk = create_new_hunk(arena->hunk_size);
hunk->next = arena->hunks;
arena->hunks = hunk;
}
void *ptr = hunk->head;
memset(ptr, 0, size);
hunk->head += size;
arena->alloced_size += size;
return ptr;
}
void ty_arena_clear(Arena *arena)
{
Arena_Hunk *hunk = arena->hunks;
while (hunk) {
hunk->head = hunk->start;
hunk = hunk->next;
}
arena->alloced_size = 0;
}
void ty_arena_free(Arena *arena)
{
Arena_Hunk *hunk = arena->hunks;
while (hunk) {
Arena_Hunk *next = hunk->next;
ty_free(hunk->start);
ty_free(hunk);
hunk = next;
}
arena->hunks = NULL;
arena->alloced_size = 0;
}
void *ty_talloc(size_t size)
{
return ty_arena_alloc(&temp_arena, size);
}
void ty_clear_temp_allocs(void)
{
ty_arena_clear(&temp_arena);
}
void *ty_alloc(size_t size)
{
if (size == 0)
ty_log_fatal(TY_ERR_MEM, "(%s) tried to allocate 0 bytes", __func__);
void *ptr = malloc(size);
if (!ptr)
ty_log_fatal(TY_ERR_MEM, "(%s) ran out of memory", __func__);
return ptr;
}
void *ty_realloc(void *ptr, size_t new_size)
{
if (new_size == 0) {
ty_free(ptr);
return NULL;
}
// The pointer will not be registered in the tracker by realloc if it does
// not yet exist.
if (ptr == NULL)
return ty_alloc(new_size);
void *new_ptr = realloc(ptr, new_size);
if (!new_ptr)
ty_log_fatal(TY_ERR_MEM, "(%s) ran out of memory", __func__);
return new_ptr;
}
void ty_free(void *ptr)
{
free(ptr);
}
|
