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memory.c
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memory.c
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/*
* Copyright (c) 2014 DeNA Co., Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include "h2o.h"
struct st_h2o_mempool_direct_t {
struct st_h2o_mempool_direct_t *next;
size_t _dummy; /* align to 2*sizeof(void*) */
char bytes[1];
};
struct st_h2o_mempool_shared_ref_t {
struct st_h2o_mempool_shared_ref_t *next;
struct st_h2o_mempool_shared_entry_t *entry;
};
void h2o_mempool_init(h2o_mempool_t *pool)
{
pool->chunks = &pool->_first_chunk;
pool->directs = NULL;
pool->shared_refs = NULL;
pool->_first_chunk.next = NULL;
pool->_first_chunk.offset = 0;
}
void h2o_mempool_clear(h2o_mempool_t *pool)
{
/* release the refcounted chunks */
if (pool->shared_refs != NULL) {
struct st_h2o_mempool_shared_ref_t *ref = pool->shared_refs;
do {
h2o_mempool_release_shared(ref->entry->bytes);
} while ((ref = ref->next) != NULL);
pool->shared_refs = NULL;
}
/* release the direct chunks */
if (pool->directs != NULL) {
struct st_h2o_mempool_direct_t *direct = pool->directs, *next;
do {
next = direct->next;
free(direct);
} while ((direct = next) != NULL);
pool->directs = NULL;
}
/* free chunks, and reset the first chunk */
while (pool->chunks != &pool->_first_chunk) {
h2o_mempool_chunk_t *next = pool->chunks->next;
free(pool->chunks);
pool->chunks = next;
}
pool->_first_chunk.next = NULL;
pool->_first_chunk.offset = 0;
}
void *h2o_mempool_alloc(h2o_mempool_t *pool, size_t sz)
{
void *ret;
if (sz >= sizeof(pool->chunks->bytes) / 4) {
/* allocate large requests directly */
struct st_h2o_mempool_direct_t *newp = h2o_malloc(offsetof(struct st_h2o_mempool_direct_t, bytes) + sz);
newp->next = pool->directs;
pool->directs = newp;
return newp->bytes;
}
/* 16-bytes rounding */
sz = (sz + 15) & ~15;
if (sizeof(pool->chunks->bytes) < pool->chunks->offset + sz) {
/* allocate new chunk */
h2o_mempool_chunk_t *newp = h2o_malloc(sizeof(*newp));
newp->next = pool->chunks;
newp->offset = 0;
pool->chunks = newp;
}
ret = pool->chunks->bytes + pool->chunks->offset;
pool->chunks->offset += sz;
return ret;
}
static void link_shared(h2o_mempool_t *pool, struct st_h2o_mempool_shared_entry_t *entry)
{
struct st_h2o_mempool_shared_ref_t *ref = h2o_mempool_alloc(pool, sizeof(struct st_h2o_mempool_shared_ref_t));
ref->entry = entry;
ref->next = pool->shared_refs;
pool->shared_refs = ref;
}
void *h2o_mempool_alloc_shared(h2o_mempool_t *pool, size_t sz)
{
struct st_h2o_mempool_shared_entry_t *entry = h2o_malloc(offsetof(struct st_h2o_mempool_shared_entry_t, bytes) + sz);
entry->refcnt = 1;
if (pool != NULL)
link_shared(pool, entry);
return entry->bytes;
}
void h2o_mempool_link_shared(h2o_mempool_t *pool, void *p)
{
h2o_mempool_addref_shared(p);
link_shared(pool, H2O_STRUCT_FROM_MEMBER(h2o_mempool_shared_entry_t, bytes, p));
}
h2o_buf_t h2o_allocate_input_buffer(h2o_input_buffer_t **_inbuf, size_t initial_size)
{
h2o_input_buffer_t *inbuf = *_inbuf;
h2o_buf_t ret;
if (inbuf == NULL) {
inbuf = h2o_malloc(offsetof(h2o_input_buffer_t, _buf) + initial_size);
*_inbuf = inbuf;
inbuf->size = 0;
inbuf->bytes = inbuf->_buf;
inbuf->_capacity = initial_size;
} else {
if (inbuf->bytes != inbuf->_buf) {
assert(inbuf->size != 0);
memmove(inbuf->_buf, inbuf->bytes, inbuf->size);
inbuf->bytes = inbuf->_buf;
}
if (inbuf->size == inbuf->_capacity) {
inbuf->_capacity *= 2;
inbuf = h2o_realloc(inbuf, offsetof(h2o_input_buffer_t, _buf) + inbuf->_capacity);
inbuf->bytes = inbuf->_buf;
*_inbuf = inbuf;
}
/* TODO shrink the size if possible */
}
ret.base = inbuf->bytes + inbuf->size;
ret.len = inbuf->_capacity - inbuf->size;
return ret;
}
void h2o_consume_input_buffer(h2o_input_buffer_t **_inbuf, size_t delta)
{
h2o_input_buffer_t *inbuf = *_inbuf;
if (delta != 0) {
assert(inbuf != NULL);
if (inbuf->size == delta) {
inbuf->size = 0;
inbuf->bytes = inbuf->_buf;
} else {
inbuf->size -= delta;
inbuf->bytes += delta;
}
}
}
void h2o_vector__expand(h2o_mempool_t *pool, h2o_vector_t *vector, size_t element_size, size_t new_capacity)
{
void *new_entries;
assert(vector->capacity < new_capacity);
if (vector->capacity == 0)
vector->capacity = 4;
while (vector->capacity < new_capacity)
vector->capacity *= 2;
new_entries = h2o_mempool_alloc(pool, element_size * vector->capacity);
memcpy(new_entries, vector->entries, element_size * vector->size);
vector->entries = new_entries;
}