cpython/Python/pyarena.c

#include "Python.h"
#include "pycore_pyarena.h"       // PyArena

/* A simple arena block structure.

   Measurements with standard library modules suggest the average
   allocation is about 20 bytes and that most compilers use a single
   block.
*/

#define DEFAULT_BLOCK_SIZE …
#define ALIGNMENT …

block;

/* The arena manages two kinds of memory, blocks of raw memory
   and a list of PyObject* pointers.  PyObjects are decrefed
   when the arena is freed.
*/

struct _arena { … };

static block *
block_new(size_t size)
{ … }

static void
block_free(block *b) { … }

static void *
block_alloc(block *b, size_t size)
{ … }

PyArena *
_PyArena_New(void)
{ … }

void
_PyArena_Free(PyArena *arena)
{ … }

void *
_PyArena_Malloc(PyArena *arena, size_t size)
{ … }

int
_PyArena_AddPyObject(PyArena *arena, PyObject *obj)
{ … }