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

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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
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GPG key ID: 4AEE18F83AFDEB23
15 changed files with 218 additions and 35 deletions
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24
Objects/listobject.c
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@ -19,13 +19,14 @@ class list "PyListObject *" "&PyList_Type"
#include "clinic/listobject.c.h"
#if PyList_MAXFREELIST > 0
static struct _Py_list_state *
get_list_state(void)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
return &interp->list;
}
#endif
/* Ensure ob_item has room for at least newsize elements, and set
@ -108,19 +109,21 @@ list_preallocate_exact(PyListObject *self, Py_ssize_t size)
void
_PyList_ClearFreeList(PyInterpreterState *interp)
{
#if PyList_MAXFREELIST > 0
struct _Py_list_state *state = &interp->list;
while (state->numfree) {
PyListObject *op = state->free_list[--state->numfree];
assert(PyList_CheckExact(op));
PyObject_GC_Del(op);
}
#endif
}
void
_PyList_Fini(PyInterpreterState *interp)
{
_PyList_ClearFreeList(interp);
#ifdef Py_DEBUG
#if defined(Py_DEBUG) && PyList_MAXFREELIST > 0
struct _Py_list_state *state = &interp->list;
state->numfree = -1;
#endif
@ -130,32 +133,38 @@ _PyList_Fini(PyInterpreterState *interp)
void
_PyList_DebugMallocStats(FILE *out)
{
#if PyList_MAXFREELIST > 0
struct _Py_list_state *state = get_list_state();
_PyDebugAllocatorStats(out,
"free PyListObject",
state->numfree, sizeof(PyListObject));
#endif
}
PyObject *
PyList_New(Py_ssize_t size)
{
PyListObject *op;
if (size < 0) {
PyErr_BadInternalCall();
return NULL;
}
#if PyList_MAXFREELIST > 0
struct _Py_list_state *state = get_list_state();
PyListObject *op;
#ifdef Py_DEBUG
// PyList_New() must not be called after _PyList_Fini()
assert(state->numfree != -1);
#endif
if (state->numfree) {
if (PyList_MAXFREELIST && state->numfree) {
state->numfree--;
op = state->free_list[state->numfree];
_Py_NewReference((PyObject *)op);
}
else {
else
#endif
{
op = PyObject_GC_New(PyListObject, &PyList_Type);
if (op == NULL) {
return NULL;
@ -344,6 +353,7 @@ list_dealloc(PyListObject *op)
}
PyMem_Free(op->ob_item);
}
#if PyList_MAXFREELIST > 0
struct _Py_list_state *state = get_list_state();
#ifdef Py_DEBUG
// list_dealloc() must not be called after _PyList_Fini()
@ -352,7 +362,9 @@ list_dealloc(PyListObject *op)
if (state->numfree < PyList_MAXFREELIST && PyList_CheckExact(op)) {
state->free_list[state->numfree++] = op;
}
else {
else
#endif
{
Py_TYPE(op)->tp_free((PyObject *)op);
}
Py_TRASHCAN_END