mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-22 17:55:18 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 15

bpo-45522: Allow to disable freelists on build time (GH-29056)

Browse source 
Freelists for object structs can now be disabled. A new ``configure``
option ``--without-freelists`` can be used to disable all freelists
except empty tuple singleton. Internal Py*_MAXFREELIST macros can now
be defined as 0 without causing compiler warnings and segfaults.

Signed-off-by: Christian Heimes <christian@python.org>
This commit is contained in:
Christian Heimes 2021-10-21 16:12:20 +03:00 • committed by GitHub
parent 5a14f71fe8
commit 9942f42a93
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
15 changed files with 218 additions and 35 deletions
Download patch file Download diff file Expand all files Collapse all files

23
Objects/frameobject.c
View file

@ -19,12 +19,14 @@ static PyMemberDef frame_memberlist[] = {
{NULL} /* Sentinel */
};
#if PyFrame_MAXFREELIST > 0
static struct _Py_frame_state *
get_frame_state(void)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
return &interp->frame;
}
#endif
static PyObject *
@ -607,9 +609,6 @@ static PyGetSetDef frame_getsetlist[] = {
f_back next item on free list, or NULL
*/
/* max value for numfree */
#define PyFrame_MAXFREELIST 200
static void _Py_HOT_FUNCTION
frame_dealloc(PyFrameObject *f)
{
@ -638,6 +637,7 @@ frame_dealloc(PyFrameObject *f)
}
Py_CLEAR(f->f_back);
Py_CLEAR(f->f_trace);
#if PyFrame_MAXFREELIST > 0
struct _Py_frame_state *state = get_frame_state();
#ifdef Py_DEBUG
// frame_dealloc() must not be called after _PyFrame_Fini()
@ -648,7 +648,9 @@ frame_dealloc(PyFrameObject *f)
f->f_back = state->free_list;
state->free_list = f;
}
else {
else
#endif
{
PyObject_GC_Del(f);
}
@ -801,8 +803,10 @@ static inline PyFrameObject*
frame_alloc(InterpreterFrame *frame, int owns)
{
PyFrameObject *f;
#if PyFrame_MAXFREELIST > 0
struct _Py_frame_state *state = get_frame_state();
if (state->free_list == NULL)
#endif
{
f = PyObject_GC_New(PyFrameObject, &PyFrame_Type);
if (f == NULL) {
@ -816,7 +820,9 @@ frame_alloc(InterpreterFrame *frame, int owns)
return NULL;
}
}
else {
#if PyFrame_MAXFREELIST > 0
else
{
#ifdef Py_DEBUG
// frame_alloc() must not be called after _PyFrame_Fini()
assert(state->numfree != -1);
@ -827,6 +833,7 @@ frame_alloc(InterpreterFrame *frame, int owns)
state->free_list = state->free_list->f_back;
_Py_NewReference((PyObject *)f);
}
#endif
f->f_frame = frame;
f->f_own_locals_memory = owns;
return f;
@ -1069,6 +1076,7 @@ PyFrame_LocalsToFast(PyFrameObject *f, int clear)
void
_PyFrame_ClearFreeList(PyInterpreterState *interp)
{
#if PyFrame_MAXFREELIST > 0
struct _Py_frame_state *state = &interp->frame;
while (state->free_list != NULL) {
PyFrameObject *f = state->free_list;
@ -1077,13 +1085,14 @@ _PyFrame_ClearFreeList(PyInterpreterState *interp)
--state->numfree;
}
assert(state->numfree == 0);
#endif
}
void
_PyFrame_Fini(PyInterpreterState *interp)
{
_PyFrame_ClearFreeList(interp);
#ifdef Py_DEBUG
#if defined(Py_DEBUG) && PyFrame_MAXFREELIST > 0
struct _Py_frame_state *state = &interp->frame;
state->numfree = -1;
#endif
@ -1093,10 +1102,12 @@ _PyFrame_Fini(PyInterpreterState *interp)
void
_PyFrame_DebugMallocStats(FILE *out)
{
#if PyFrame_MAXFREELIST > 0
struct _Py_frame_state *state = get_frame_state();
_PyDebugAllocatorStats(out,
"free PyFrameObject",
state->numfree, sizeof(PyFrameObject));
#endif
}