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
|
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Fixed-size object allocator. Returned memory is not zeroed.
//
// See malloc.h for overview.
#include "runtime.h"
#include "arch.h"
#include "malloc.h"
// Initialize f to allocate objects of the given size,
// using the allocator to obtain chunks of memory.
void
runtime_FixAlloc_Init(FixAlloc *f, uintptr size, void (*first)(void*, byte*), void *arg, uint64 *stat)
{
f->size = size;
f->first = first;
f->arg = arg;
f->list = nil;
f->chunk = nil;
f->nchunk = 0;
f->inuse = 0;
f->stat = stat;
}
void*
runtime_FixAlloc_Alloc(FixAlloc *f)
{
void *v;
if(f->size == 0) {
runtime_printf("runtime: use of FixAlloc_Alloc before FixAlloc_Init\n");
runtime_throw("runtime: internal error");
}
if(f->list) {
v = f->list;
f->list = *(void**)f->list;
f->inuse += f->size;
return v;
}
if(f->nchunk < f->size) {
f->chunk = runtime_persistentalloc(FixAllocChunk, 0, f->stat);
f->nchunk = FixAllocChunk;
}
v = f->chunk;
if(f->first)
f->first(f->arg, v);
f->chunk += f->size;
f->nchunk -= f->size;
f->inuse += f->size;
return v;
}
void
runtime_FixAlloc_Free(FixAlloc *f, void *p)
{
f->inuse -= f->size;
*(void**)p = f->list;
f->list = p;
}
|
