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authorJeremy Hylton <jeremy@alum.mit.edu>2006-02-28 18:29:00 (GMT)
committerJeremy Hylton <jeremy@alum.mit.edu>2006-02-28 18:29:00 (GMT)
commit08533fdad62197f4724f029c33b88975733f4045 (patch)
tree812d142a36df89cff8238ec1da2c5b305d915dcb
parent14ca327f998511da5e89f819204c54fa582dd696 (diff)
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-rw-r--r--Python/pyarena.c171
1 files changed, 87 insertions, 84 deletions
diff --git a/Python/pyarena.c b/Python/pyarena.c
index 84c015f..0b865db 100644
--- a/Python/pyarena.c
+++ b/Python/pyarena.c
@@ -4,8 +4,8 @@
/* An arena list is a linked list that can store PyObjects. */
typedef struct _arena_list {
- struct _arena_list *al_next;
- void *al_pointer;
+ struct _arena_list *al_next;
+ void *al_pointer;
} PyArenaList;
/* A simple arena block structure */
@@ -13,134 +13,137 @@ typedef struct _arena_list {
#define DEFAULT_BLOCK_SIZE 8192
typedef struct _block {
- size_t ab_size;
- size_t ab_offset;
- struct _block *ab_next;
- void *ab_mem;
+ size_t ab_size;
+ size_t ab_offset;
+ struct _block *ab_next;
+ void *ab_mem;
} block;
struct _arena {
- block *a_head;
- block *a_cur;
- PyArenaList *a_object_head;
- PyArenaList *a_object_tail;
+ block *a_head;
+ block *a_cur;
+ PyArenaList *a_object_head;
+ PyArenaList *a_object_tail;
};
static PyArenaList*
PyArenaList_New(void)
{
- PyArenaList *alist = (PyArenaList *)malloc(sizeof(PyArenaList));
- if (!alist)
- return NULL;
+ PyArenaList *alist = (PyArenaList *)malloc(sizeof(PyArenaList));
+ if (!alist)
+ return NULL;
- alist->al_next = NULL;
- alist->al_pointer = NULL;
- return alist;
+ alist->al_next = NULL;
+ alist->al_pointer = NULL;
+ return alist;
}
static void
PyArenaList_FreeObject(PyArenaList *alist)
{
- while (alist) {
- PyArenaList *prev;
- Py_XDECREF((PyObject *)alist->al_pointer);
- alist->al_pointer = NULL;
- prev = alist;
- alist = alist->al_next;
- free(prev);
- }
+ while (alist) {
+ PyArenaList *prev;
+ Py_XDECREF((PyObject *)alist->al_pointer);
+ alist->al_pointer = NULL;
+ prev = alist;
+ alist = alist->al_next;
+ free(prev);
+ }
}
static block *
block_new(size_t size)
{
- /* Allocate header and block as one unit. ab_mem points just past header. */
- block *b = (block *)malloc(sizeof(block) + size);
- if (!b)
- return NULL;
- b->ab_size = size;
- b->ab_mem = (void *)(b + 1);
- b->ab_next = NULL;
- b->ab_offset = 0;
- return b;
+ /* Allocate header and block as one unit.
+ ab_mem points just past header. */
+ block *b = (block *)malloc(sizeof(block) + size);
+ if (!b)
+ return NULL;
+ b->ab_size = size;
+ b->ab_mem = (void *)(b + 1);
+ b->ab_next = NULL;
+ b->ab_offset = 0;
+ return b;
}
static void
block_free(block *b) {
- while (b) {
- block *next = b->ab_next;
- free(b);
- b = next;
- }
+ while (b) {
+ block *next = b->ab_next;
+ free(b);
+ b = next;
+ }
}
static void *
block_alloc(block *b, size_t size)
{
- void *p;
- assert(b);
- if (b->ab_offset + size > b->ab_size) {
- /* If we need to allocate more memory than will fit in the default
- block, allocate a one-off block that is exactly the right size. */
- /* TODO(jhylton): Think more about space waste at end of block */
- block *new = block_new(
- size < DEFAULT_BLOCK_SIZE ? DEFAULT_BLOCK_SIZE : size);
- if (!new)
- return NULL;
- assert(!b->ab_next);
- b->ab_next = new;
- b = new;
- }
-
- assert(b->ab_offset + size <= b->ab_size);
- p = (void *)(((char *)b->ab_mem) + b->ab_offset);
- b->ab_offset += size;
- return p;
+ void *p;
+ assert(b);
+ if (b->ab_offset + size > b->ab_size) {
+ /* If we need to allocate more memory than will fit in
+ the default block, allocate a one-off block that is
+ exactly the right size. */
+ /* TODO(jhylton): Think about space waste at end of block */
+ block *new = block_new(
+ size < DEFAULT_BLOCK_SIZE ?
+ DEFAULT_BLOCK_SIZE : size);
+ if (!new)
+ return NULL;
+ assert(!b->ab_next);
+ b->ab_next = new;
+ b = new;
+ }
+
+ assert(b->ab_offset + size <= b->ab_size);
+ p = (void *)(((char *)b->ab_mem) + b->ab_offset);
+ b->ab_offset += size;
+ return p;
}
PyArena *
PyArena_New()
{
- PyArena* arena = (PyArena *)malloc(sizeof(PyArena));
- if (!arena)
- return NULL;
-
- arena->a_head = block_new(DEFAULT_BLOCK_SIZE);
- arena->a_cur = arena->a_head;
- arena->a_object_head = PyArenaList_New();
- arena->a_object_tail = arena->a_object_head;
- return arena;
+ PyArena* arena = (PyArena *)malloc(sizeof(PyArena));
+ if (!arena)
+ return NULL;
+
+ arena->a_head = block_new(DEFAULT_BLOCK_SIZE);
+ arena->a_cur = arena->a_head;
+ arena->a_object_head = PyArenaList_New();
+ arena->a_object_tail = arena->a_object_head;
+ return arena;
}
void
PyArena_Free(PyArena *arena)
{
- assert(arena);
- block_free(arena->a_head);
- PyArenaList_FreeObject(arena->a_object_head);
- free(arena);
+ assert(arena);
+ block_free(arena->a_head);
+ PyArenaList_FreeObject(arena->a_object_head);
+ free(arena);
}
void *
PyArena_Malloc(PyArena *arena, size_t size)
{
- void *p = block_alloc(arena->a_cur, size);
- if (!p)
- return NULL;
- /* Reset cur if we allocated a new block. */
- if (arena->a_cur->ab_next) {
- arena->a_cur = arena->a_cur->ab_next;
- }
- return p;
+ void *p = block_alloc(arena->a_cur, size);
+ if (!p)
+ return NULL;
+ /* Reset cur if we allocated a new block. */
+ if (arena->a_cur->ab_next) {
+ arena->a_cur = arena->a_cur->ab_next;
+ }
+ return p;
}
int
PyArena_AddPyObject(PyArena *arena, PyObject *pointer)
{
- PyArenaList *tail = arena->a_object_tail;
- assert(pointer);
- tail->al_next = PyArenaList_New();
- tail->al_pointer = pointer;
- arena->a_object_tail = tail->al_next;
- return 1;
+ PyArenaList *tail = arena->a_object_tail;
+ assert(pointer);
+ tail->al_next = PyArenaList_New();
+ tail->al_pointer = pointer;
+ arena->a_object_tail = tail->al_next;
+ return 1;
}