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3662 lines (3209 loc) · 111 KB
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/* Python's malloc wrappers (see pymem.h) */
#include "Python.h"
#include "pycore_interp.h" // _PyInterpreterState_HasFeature
#include "pycore_object.h" // _PyDebugAllocatorStats() definition
#include "pycore_obmalloc.h"
#include "pycore_obmalloc_init.h"
#include "pycore_pyerrors.h" // _Py_FatalErrorFormat()
#include "pycore_pymem.h"
#include "pycore_pystate.h" // _PyInterpreterState_GET
#include "pycore_stats.h" // OBJECT_STAT_INC_COND()
#include <stdlib.h> // malloc()
#include <stdbool.h>
#ifdef WITH_MIMALLOC
// Forward declarations of functions used in our mimalloc modifications
static void _PyMem_mi_page_clear_qsbr(mi_page_t *page);
static bool _PyMem_mi_page_is_safe_to_free(mi_page_t *page);
static bool _PyMem_mi_page_maybe_free(mi_page_t *page, mi_page_queue_t *pq, bool force);
static void _PyMem_mi_page_reclaimed(mi_page_t *page);
static void _PyMem_mi_heap_collect_qsbr(mi_heap_t *heap);
# include "pycore_mimalloc.h"
# include "mimalloc/static.c"
# include "mimalloc/internal.h" // for stats
#endif
#if defined(Py_GIL_DISABLED) && !defined(WITH_MIMALLOC)
# error "Py_GIL_DISABLED requires WITH_MIMALLOC"
#endif
#undef uint
#define uint pymem_uint
/* Defined in tracemalloc.c */
extern void _PyMem_DumpTraceback(int fd, const void *ptr);
static void _PyObject_DebugDumpAddress(const void *p);
static void _PyMem_DebugCheckAddress(const char *func, char api_id, const void *p);
static void set_up_debug_hooks_domain_unlocked(PyMemAllocatorDomain domain);
static void set_up_debug_hooks_unlocked(void);
static void get_allocator_unlocked(PyMemAllocatorDomain, PyMemAllocatorEx *);
static void set_allocator_unlocked(PyMemAllocatorDomain, PyMemAllocatorEx *);
/***************************************/
/* low-level allocator implementations */
/***************************************/
/* the default raw allocator (wraps malloc) */
void *
_PyMem_RawMalloc(void *Py_UNUSED(ctx), size_t size)
{
/* PyMem_RawMalloc(0) means malloc(1). Some systems would return NULL
for malloc(0), which would be treated as an error. Some platforms would
return a pointer with no memory behind it, which would break pymalloc.
To solve these problems, allocate an extra byte. */
if (size == 0)
size = 1;
return malloc(size);
}
void *
_PyMem_RawCalloc(void *Py_UNUSED(ctx), size_t nelem, size_t elsize)
{
/* PyMem_RawCalloc(0, 0) means calloc(1, 1). Some systems would return NULL
for calloc(0, 0), which would be treated as an error. Some platforms
would return a pointer with no memory behind it, which would break
pymalloc. To solve these problems, allocate an extra byte. */
if (nelem == 0 || elsize == 0) {
nelem = 1;
elsize = 1;
}
return calloc(nelem, elsize);
}
void *
_PyMem_RawRealloc(void *Py_UNUSED(ctx), void *ptr, size_t size)
{
if (size == 0)
size = 1;
return realloc(ptr, size);
}
void
_PyMem_RawFree(void *Py_UNUSED(ctx), void *ptr)
{
free(ptr);
}
#ifdef WITH_MIMALLOC
static void
_PyMem_mi_page_clear_qsbr(mi_page_t *page)
{
#ifdef Py_GIL_DISABLED
// Clear the QSBR goal and remove the page from the QSBR linked list.
page->qsbr_goal = 0;
if (page->qsbr_node.next != NULL) {
llist_remove(&page->qsbr_node);
}
#endif
}
// Check if an empty, newly reclaimed page is safe to free now.
static bool
_PyMem_mi_page_is_safe_to_free(mi_page_t *page)
{
assert(mi_page_all_free(page));
#ifdef Py_GIL_DISABLED
assert(page->qsbr_node.next == NULL);
if (page->use_qsbr && page->qsbr_goal != 0) {
_PyThreadStateImpl *tstate = (_PyThreadStateImpl *)_PyThreadState_GET();
if (tstate == NULL) {
return false;
}
return _Py_qbsr_goal_reached(tstate->qsbr, page->qsbr_goal);
}
#endif
return true;
}
#ifdef Py_GIL_DISABLED
// If we are deferring collection of more than this amount of memory for
// mimalloc pages, advance the write sequence. Advancing allows these
// pages to be re-used in a different thread or for a different size class.
#define QSBR_PAGE_MEM_LIMIT 4096*20
// Return true if the global write sequence should be advanced for a mimalloc
// page that is deferred from collection.
static bool
should_advance_qsbr_for_page(struct _qsbr_thread_state *qsbr, mi_page_t *page)
{
size_t bsize = mi_page_block_size(page);
size_t page_size = page->capacity*bsize;
if (page_size > QSBR_PAGE_MEM_LIMIT) {
qsbr->deferred_page_memory = 0;
return true;
}
qsbr->deferred_page_memory += page_size;
if (qsbr->deferred_page_memory > QSBR_PAGE_MEM_LIMIT) {
qsbr->deferred_page_memory = 0;
return true;
}
return false;
}
static _PyThreadStateImpl *
tstate_from_heap(mi_heap_t *heap)
{
return _Py_CONTAINER_OF(heap->tld, _PyThreadStateImpl, mimalloc.tld);
}
#endif
static bool
_PyMem_mi_page_maybe_free(mi_page_t *page, mi_page_queue_t *pq, bool force)
{
#ifdef Py_GIL_DISABLED
assert(mi_page_all_free(page));
if (page->use_qsbr) {
struct _qsbr_thread_state *qsbr = ((_PyThreadStateImpl *)PyThreadState_GET())->qsbr;
if (page->qsbr_goal != 0 && _Py_qbsr_goal_reached(qsbr, page->qsbr_goal)) {
_PyMem_mi_page_clear_qsbr(page);
_mi_page_free(page, pq, force);
return true;
}
// gh-145615: since we are not freeing this page yet, we want to
// make it available for allocations. Note that the QSBR goal and
// linked list node remain set even if the page is later used for
// an allocation. We only detect and clear the QSBR goal when the
// page becomes empty again (used == 0).
if (mi_page_is_in_full(page)) {
_mi_page_unfull(page);
}
_PyMem_mi_page_clear_qsbr(page);
page->retire_expire = 0;
if (should_advance_qsbr_for_page(qsbr, page)) {
page->qsbr_goal = _Py_qsbr_advance(qsbr->shared);
}
else {
page->qsbr_goal = _Py_qsbr_shared_next(qsbr->shared);
}
// We may be freeing a page belonging to a different thread during a
// stop-the-world event. Find the _PyThreadStateImpl for the page.
_PyThreadStateImpl *tstate = tstate_from_heap(mi_page_heap(page));
llist_insert_tail(&tstate->mimalloc.page_list, &page->qsbr_node);
return false;
}
#endif
_mi_page_free(page, pq, force);
return true;
}
static void
_PyMem_mi_page_reclaimed(mi_page_t *page)
{
#ifdef Py_GIL_DISABLED
assert(page->qsbr_node.next == NULL);
if (page->qsbr_goal != 0) {
if (mi_page_all_free(page)) {
assert(page->qsbr_node.next == NULL);
_PyThreadStateImpl *tstate = tstate_from_heap(mi_page_heap(page));
assert(tstate == (_PyThreadStateImpl *)_PyThreadState_GET());
page->retire_expire = 0;
llist_insert_tail(&tstate->mimalloc.page_list, &page->qsbr_node);
}
else {
page->qsbr_goal = 0;
}
}
#endif
}
static void
_PyMem_mi_heap_collect_qsbr(mi_heap_t *heap)
{
#ifdef Py_GIL_DISABLED
if (!heap->page_use_qsbr) {
return;
}
_PyThreadStateImpl *tstate = (_PyThreadStateImpl *)_PyThreadState_GET();
struct llist_node *head = &tstate->mimalloc.page_list;
if (llist_empty(head)) {
return;
}
struct llist_node *node;
llist_for_each_safe(node, head) {
mi_page_t *page = llist_data(node, mi_page_t, qsbr_node);
if (!mi_page_all_free(page)) {
// We allocated from this page some point after the delayed free
_PyMem_mi_page_clear_qsbr(page);
continue;
}
if (!_Py_qsbr_poll(tstate->qsbr, page->qsbr_goal)) {
return;
}
_PyMem_mi_page_clear_qsbr(page);
_mi_page_free(page, mi_page_queue_of(page), false);
}
#endif
}
void *
_PyMem_MiMalloc(void *ctx, size_t size)
{
#ifdef Py_GIL_DISABLED
_PyThreadStateImpl *tstate = (_PyThreadStateImpl *)_PyThreadState_GET();
mi_heap_t *heap = &tstate->mimalloc.heaps[_Py_MIMALLOC_HEAP_MEM];
return mi_heap_malloc(heap, size);
#else
return mi_malloc(size);
#endif
}
void *
_PyMem_MiCalloc(void *ctx, size_t nelem, size_t elsize)
{
#ifdef Py_GIL_DISABLED
_PyThreadStateImpl *tstate = (_PyThreadStateImpl *)_PyThreadState_GET();
mi_heap_t *heap = &tstate->mimalloc.heaps[_Py_MIMALLOC_HEAP_MEM];
return mi_heap_calloc(heap, nelem, elsize);
#else
return mi_calloc(nelem, elsize);
#endif
}
void *
_PyMem_MiRealloc(void *ctx, void *ptr, size_t size)
{
#ifdef Py_GIL_DISABLED
_PyThreadStateImpl *tstate = (_PyThreadStateImpl *)_PyThreadState_GET();
mi_heap_t *heap = &tstate->mimalloc.heaps[_Py_MIMALLOC_HEAP_MEM];
return mi_heap_realloc(heap, ptr, size);
#else
return mi_realloc(ptr, size);
#endif
}
void
_PyMem_MiFree(void *ctx, void *ptr)
{
mi_free(ptr);
}
void *
_PyObject_MiMalloc(void *ctx, size_t nbytes)
{
#ifdef Py_GIL_DISABLED
_PyThreadStateImpl *tstate = (_PyThreadStateImpl *)_PyThreadState_GET();
mi_heap_t *heap = tstate->mimalloc.current_object_heap;
return mi_heap_malloc(heap, nbytes);
#else
return mi_malloc(nbytes);
#endif
}
void *
_PyObject_MiCalloc(void *ctx, size_t nelem, size_t elsize)
{
#ifdef Py_GIL_DISABLED
_PyThreadStateImpl *tstate = (_PyThreadStateImpl *)_PyThreadState_GET();
mi_heap_t *heap = tstate->mimalloc.current_object_heap;
return mi_heap_calloc(heap, nelem, elsize);
#else
return mi_calloc(nelem, elsize);
#endif
}
void *
_PyObject_MiRealloc(void *ctx, void *ptr, size_t nbytes)
{
#ifdef Py_GIL_DISABLED
_PyThreadStateImpl *tstate = (_PyThreadStateImpl *)_PyThreadState_GET();
mi_heap_t *heap = tstate->mimalloc.current_object_heap;
return mi_heap_realloc(heap, ptr, nbytes);
#else
return mi_realloc(ptr, nbytes);
#endif
}
void
_PyObject_MiFree(void *ctx, void *ptr)
{
mi_free(ptr);
}
#endif // WITH_MIMALLOC
#define MALLOC_ALLOC {NULL, _PyMem_RawMalloc, _PyMem_RawCalloc, _PyMem_RawRealloc, _PyMem_RawFree}
#ifdef WITH_MIMALLOC
# define MIMALLOC_ALLOC {NULL, _PyMem_MiMalloc, _PyMem_MiCalloc, _PyMem_MiRealloc, _PyMem_MiFree}
# define MIMALLOC_OBJALLOC {NULL, _PyObject_MiMalloc, _PyObject_MiCalloc, _PyObject_MiRealloc, _PyObject_MiFree}
#endif
/* the pymalloc allocator */
// The actual implementation is further down.
#if defined(WITH_PYMALLOC)
void* _PyObject_Malloc(void *ctx, size_t size);
void* _PyObject_Calloc(void *ctx, size_t nelem, size_t elsize);
void _PyObject_Free(void *ctx, void *p);
void* _PyObject_Realloc(void *ctx, void *ptr, size_t size);
# define PYMALLOC_ALLOC {NULL, _PyObject_Malloc, _PyObject_Calloc, _PyObject_Realloc, _PyObject_Free}
#endif // WITH_PYMALLOC
#if defined(Py_GIL_DISABLED)
// Py_GIL_DISABLED requires using mimalloc for "mem" and "obj" domains.
# define PYRAW_ALLOC MALLOC_ALLOC
# define PYMEM_ALLOC MIMALLOC_ALLOC
# define PYOBJ_ALLOC MIMALLOC_OBJALLOC
#elif defined(WITH_PYMALLOC)
# define PYRAW_ALLOC MALLOC_ALLOC
# define PYMEM_ALLOC PYMALLOC_ALLOC
# define PYOBJ_ALLOC PYMALLOC_ALLOC
#else
# define PYRAW_ALLOC MALLOC_ALLOC
# define PYMEM_ALLOC MALLOC_ALLOC
# define PYOBJ_ALLOC MALLOC_ALLOC
#endif
/* the default debug allocators */
// The actual implementation is further down.
void* _PyMem_DebugRawMalloc(void *ctx, size_t size);
void* _PyMem_DebugRawCalloc(void *ctx, size_t nelem, size_t elsize);
void* _PyMem_DebugRawRealloc(void *ctx, void *ptr, size_t size);
void _PyMem_DebugRawFree(void *ctx, void *ptr);
void* _PyMem_DebugMalloc(void *ctx, size_t size);
void* _PyMem_DebugCalloc(void *ctx, size_t nelem, size_t elsize);
void* _PyMem_DebugRealloc(void *ctx, void *ptr, size_t size);
void _PyMem_DebugFree(void *ctx, void *p);
#define PYDBGRAW_ALLOC \
{&_PyRuntime.allocators.debug.raw, _PyMem_DebugRawMalloc, _PyMem_DebugRawCalloc, _PyMem_DebugRawRealloc, _PyMem_DebugRawFree}
#define PYDBGMEM_ALLOC \
{&_PyRuntime.allocators.debug.mem, _PyMem_DebugMalloc, _PyMem_DebugCalloc, _PyMem_DebugRealloc, _PyMem_DebugFree}
#define PYDBGOBJ_ALLOC \
{&_PyRuntime.allocators.debug.obj, _PyMem_DebugMalloc, _PyMem_DebugCalloc, _PyMem_DebugRealloc, _PyMem_DebugFree}
/* default raw allocator (not swappable) */
void *
_PyMem_DefaultRawMalloc(size_t size)
{
#ifdef Py_DEBUG
return _PyMem_DebugRawMalloc(&_PyRuntime.allocators.debug.raw, size);
#else
return _PyMem_RawMalloc(NULL, size);
#endif
}
void *
_PyMem_DefaultRawCalloc(size_t nelem, size_t elsize)
{
#ifdef Py_DEBUG
return _PyMem_DebugRawCalloc(&_PyRuntime.allocators.debug.raw, nelem, elsize);
#else
return _PyMem_RawCalloc(NULL, nelem, elsize);
#endif
}
void *
_PyMem_DefaultRawRealloc(void *ptr, size_t size)
{
#ifdef Py_DEBUG
return _PyMem_DebugRawRealloc(&_PyRuntime.allocators.debug.raw, ptr, size);
#else
return _PyMem_RawRealloc(NULL, ptr, size);
#endif
}
void
_PyMem_DefaultRawFree(void *ptr)
{
#ifdef Py_DEBUG
_PyMem_DebugRawFree(&_PyRuntime.allocators.debug.raw, ptr);
#else
_PyMem_RawFree(NULL, ptr);
#endif
}
wchar_t*
_PyMem_DefaultRawWcsdup(const wchar_t *str)
{
assert(str != NULL);
size_t len = wcslen(str);
if (len > (size_t)PY_SSIZE_T_MAX / sizeof(wchar_t) - 1) {
return NULL;
}
size_t size = (len + 1) * sizeof(wchar_t);
wchar_t *str2 = _PyMem_DefaultRawMalloc(size);
if (str2 == NULL) {
return NULL;
}
memcpy(str2, str, size);
return str2;
}
/* the low-level virtual memory allocator */
#ifdef WITH_PYMALLOC
# ifdef MS_WINDOWS
# include <windows.h>
# elif defined(HAVE_MMAP)
# include <sys/mman.h>
# ifdef MAP_ANONYMOUS
# define ARENAS_USE_MMAP
# endif
# endif
#endif
void *
_PyMem_ArenaAlloc(void *Py_UNUSED(ctx), size_t size)
{
#ifdef MS_WINDOWS
return VirtualAlloc(NULL, size,
MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
#elif defined(ARENAS_USE_MMAP)
void *ptr;
ptr = mmap(NULL, size, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
if (ptr == MAP_FAILED)
return NULL;
assert(ptr != NULL);
return ptr;
#else
return malloc(size);
#endif
}
void
_PyMem_ArenaFree(void *Py_UNUSED(ctx), void *ptr,
#if defined(ARENAS_USE_MMAP)
size_t size
#else
size_t Py_UNUSED(size)
#endif
)
{
#ifdef MS_WINDOWS
/* Unlike free(), VirtualFree() does not special-case NULL to noop. */
if (ptr == NULL) {
return;
}
VirtualFree(ptr, 0, MEM_RELEASE);
#elif defined(ARENAS_USE_MMAP)
/* Unlike free(), munmap() does not special-case NULL to noop. */
if (ptr == NULL) {
return;
}
munmap(ptr, size);
#else
free(ptr);
#endif
}
/*******************************************/
/* end low-level allocator implementations */
/*******************************************/
#define ALLOCATORS_MUTEX (_PyRuntime.allocators.mutex)
#define _PyMem_Raw (_PyRuntime.allocators.standard.raw)
#define _PyMem (_PyRuntime.allocators.standard.mem)
#define _PyObject (_PyRuntime.allocators.standard.obj)
#define _PyMem_Debug (_PyRuntime.allocators.debug)
#define _PyObject_Arena (_PyRuntime.allocators.obj_arena)
/***************************/
/* managing the allocators */
/***************************/
static int
set_default_allocator_unlocked(PyMemAllocatorDomain domain, int debug,
PyMemAllocatorEx *old_alloc)
{
if (old_alloc != NULL) {
get_allocator_unlocked(domain, old_alloc);
}
PyMemAllocatorEx new_alloc;
switch(domain)
{
case PYMEM_DOMAIN_RAW:
new_alloc = (PyMemAllocatorEx)PYRAW_ALLOC;
break;
case PYMEM_DOMAIN_MEM:
new_alloc = (PyMemAllocatorEx)PYMEM_ALLOC;
break;
case PYMEM_DOMAIN_OBJ:
new_alloc = (PyMemAllocatorEx)PYOBJ_ALLOC;
break;
default:
/* unknown domain */
return -1;
}
set_allocator_unlocked(domain, &new_alloc);
if (debug) {
set_up_debug_hooks_domain_unlocked(domain);
}
return 0;
}
#ifdef Py_DEBUG
static const int pydebug = 1;
#else
static const int pydebug = 0;
#endif
int
_PyMem_GetAllocatorName(const char *name, PyMemAllocatorName *allocator)
{
if (name == NULL || *name == '\0') {
/* PYTHONMALLOC is empty or is not set or ignored (-E/-I command line
nameions): use default memory allocators */
*allocator = PYMEM_ALLOCATOR_DEFAULT;
}
else if (strcmp(name, "default") == 0) {
*allocator = PYMEM_ALLOCATOR_DEFAULT;
}
else if (strcmp(name, "debug") == 0) {
*allocator = PYMEM_ALLOCATOR_DEBUG;
}
#if defined(WITH_PYMALLOC) && !defined(Py_GIL_DISABLED)
else if (strcmp(name, "pymalloc") == 0) {
*allocator = PYMEM_ALLOCATOR_PYMALLOC;
}
else if (strcmp(name, "pymalloc_debug") == 0) {
*allocator = PYMEM_ALLOCATOR_PYMALLOC_DEBUG;
}
#endif
#ifdef WITH_MIMALLOC
else if (strcmp(name, "mimalloc") == 0) {
*allocator = PYMEM_ALLOCATOR_MIMALLOC;
}
else if (strcmp(name, "mimalloc_debug") == 0) {
*allocator = PYMEM_ALLOCATOR_MIMALLOC_DEBUG;
}
#endif
#ifndef Py_GIL_DISABLED
else if (strcmp(name, "malloc") == 0) {
*allocator = PYMEM_ALLOCATOR_MALLOC;
}
else if (strcmp(name, "malloc_debug") == 0) {
*allocator = PYMEM_ALLOCATOR_MALLOC_DEBUG;
}
#endif
else {
/* unknown allocator */
return -1;
}
return 0;
}
static int
set_up_allocators_unlocked(PyMemAllocatorName allocator)
{
switch (allocator) {
case PYMEM_ALLOCATOR_NOT_SET:
/* do nothing */
break;
case PYMEM_ALLOCATOR_DEFAULT:
(void)set_default_allocator_unlocked(PYMEM_DOMAIN_RAW, pydebug, NULL);
(void)set_default_allocator_unlocked(PYMEM_DOMAIN_MEM, pydebug, NULL);
(void)set_default_allocator_unlocked(PYMEM_DOMAIN_OBJ, pydebug, NULL);
_PyRuntime.allocators.is_debug_enabled = pydebug;
break;
case PYMEM_ALLOCATOR_DEBUG:
(void)set_default_allocator_unlocked(PYMEM_DOMAIN_RAW, 1, NULL);
(void)set_default_allocator_unlocked(PYMEM_DOMAIN_MEM, 1, NULL);
(void)set_default_allocator_unlocked(PYMEM_DOMAIN_OBJ, 1, NULL);
_PyRuntime.allocators.is_debug_enabled = 1;
break;
#ifdef WITH_PYMALLOC
case PYMEM_ALLOCATOR_PYMALLOC:
case PYMEM_ALLOCATOR_PYMALLOC_DEBUG:
{
PyMemAllocatorEx malloc_alloc = MALLOC_ALLOC;
set_allocator_unlocked(PYMEM_DOMAIN_RAW, &malloc_alloc);
PyMemAllocatorEx pymalloc = PYMALLOC_ALLOC;
set_allocator_unlocked(PYMEM_DOMAIN_MEM, &pymalloc);
set_allocator_unlocked(PYMEM_DOMAIN_OBJ, &pymalloc);
int is_debug = (allocator == PYMEM_ALLOCATOR_PYMALLOC_DEBUG);
_PyRuntime.allocators.is_debug_enabled = is_debug;
if (is_debug) {
set_up_debug_hooks_unlocked();
}
break;
}
#endif
#ifdef WITH_MIMALLOC
case PYMEM_ALLOCATOR_MIMALLOC:
case PYMEM_ALLOCATOR_MIMALLOC_DEBUG:
{
PyMemAllocatorEx malloc_alloc = MALLOC_ALLOC;
set_allocator_unlocked(PYMEM_DOMAIN_RAW, &malloc_alloc);
PyMemAllocatorEx pymalloc = MIMALLOC_ALLOC;
set_allocator_unlocked(PYMEM_DOMAIN_MEM, &pymalloc);
PyMemAllocatorEx objmalloc = MIMALLOC_OBJALLOC;
set_allocator_unlocked(PYMEM_DOMAIN_OBJ, &objmalloc);
int is_debug = (allocator == PYMEM_ALLOCATOR_MIMALLOC_DEBUG);
_PyRuntime.allocators.is_debug_enabled = is_debug;
if (is_debug) {
set_up_debug_hooks_unlocked();
}
break;
}
#endif
case PYMEM_ALLOCATOR_MALLOC:
case PYMEM_ALLOCATOR_MALLOC_DEBUG:
{
PyMemAllocatorEx malloc_alloc = MALLOC_ALLOC;
set_allocator_unlocked(PYMEM_DOMAIN_RAW, &malloc_alloc);
set_allocator_unlocked(PYMEM_DOMAIN_MEM, &malloc_alloc);
set_allocator_unlocked(PYMEM_DOMAIN_OBJ, &malloc_alloc);
int is_debug = (allocator == PYMEM_ALLOCATOR_MALLOC_DEBUG);
_PyRuntime.allocators.is_debug_enabled = is_debug;
if (is_debug) {
set_up_debug_hooks_unlocked();
}
break;
}
default:
/* unknown allocator */
return -1;
}
return 0;
}
int
_PyMem_SetupAllocators(PyMemAllocatorName allocator)
{
PyMutex_Lock(&ALLOCATORS_MUTEX);
int res = set_up_allocators_unlocked(allocator);
PyMutex_Unlock(&ALLOCATORS_MUTEX);
return res;
}
static int
pymemallocator_eq(PyMemAllocatorEx *a, PyMemAllocatorEx *b)
{
return (memcmp(a, b, sizeof(PyMemAllocatorEx)) == 0);
}
static const char*
get_current_allocator_name_unlocked(void)
{
PyMemAllocatorEx malloc_alloc = MALLOC_ALLOC;
#ifdef WITH_PYMALLOC
PyMemAllocatorEx pymalloc = PYMALLOC_ALLOC;
#endif
#ifdef WITH_MIMALLOC
PyMemAllocatorEx mimalloc = MIMALLOC_ALLOC;
PyMemAllocatorEx mimalloc_obj = MIMALLOC_OBJALLOC;
#endif
if (pymemallocator_eq(&_PyMem_Raw, &malloc_alloc) &&
pymemallocator_eq(&_PyMem, &malloc_alloc) &&
pymemallocator_eq(&_PyObject, &malloc_alloc))
{
return "malloc";
}
#ifdef WITH_PYMALLOC
if (pymemallocator_eq(&_PyMem_Raw, &malloc_alloc) &&
pymemallocator_eq(&_PyMem, &pymalloc) &&
pymemallocator_eq(&_PyObject, &pymalloc))
{
return "pymalloc";
}
#endif
#ifdef WITH_MIMALLOC
if (pymemallocator_eq(&_PyMem_Raw, &malloc_alloc) &&
pymemallocator_eq(&_PyMem, &mimalloc) &&
pymemallocator_eq(&_PyObject, &mimalloc_obj))
{
return "mimalloc";
}
#endif
PyMemAllocatorEx dbg_raw = PYDBGRAW_ALLOC;
PyMemAllocatorEx dbg_mem = PYDBGMEM_ALLOC;
PyMemAllocatorEx dbg_obj = PYDBGOBJ_ALLOC;
if (pymemallocator_eq(&_PyMem_Raw, &dbg_raw) &&
pymemallocator_eq(&_PyMem, &dbg_mem) &&
pymemallocator_eq(&_PyObject, &dbg_obj))
{
/* Debug hooks installed */
if (pymemallocator_eq(&_PyMem_Debug.raw.alloc, &malloc_alloc) &&
pymemallocator_eq(&_PyMem_Debug.mem.alloc, &malloc_alloc) &&
pymemallocator_eq(&_PyMem_Debug.obj.alloc, &malloc_alloc))
{
return "malloc_debug";
}
#ifdef WITH_PYMALLOC
if (pymemallocator_eq(&_PyMem_Debug.raw.alloc, &malloc_alloc) &&
pymemallocator_eq(&_PyMem_Debug.mem.alloc, &pymalloc) &&
pymemallocator_eq(&_PyMem_Debug.obj.alloc, &pymalloc))
{
return "pymalloc_debug";
}
#endif
#ifdef WITH_MIMALLOC
if (pymemallocator_eq(&_PyMem_Debug.raw.alloc, &malloc_alloc) &&
pymemallocator_eq(&_PyMem_Debug.mem.alloc, &mimalloc) &&
pymemallocator_eq(&_PyMem_Debug.obj.alloc, &mimalloc_obj))
{
return "mimalloc_debug";
}
#endif
}
return NULL;
}
const char*
_PyMem_GetCurrentAllocatorName(void)
{
PyMutex_Lock(&ALLOCATORS_MUTEX);
const char *name = get_current_allocator_name_unlocked();
PyMutex_Unlock(&ALLOCATORS_MUTEX);
return name;
}
int
_PyMem_DebugEnabled(void)
{
return _PyRuntime.allocators.is_debug_enabled;
}
#ifdef WITH_PYMALLOC
static int
_PyMem_PymallocEnabled(void)
{
if (_PyMem_DebugEnabled()) {
return (_PyMem_Debug.obj.alloc.malloc == _PyObject_Malloc);
}
else {
return (_PyObject.malloc == _PyObject_Malloc);
}
}
#ifdef WITH_MIMALLOC
static int
_PyMem_MimallocEnabled(void)
{
#ifdef Py_GIL_DISABLED
return 1;
#else
if (_PyMem_DebugEnabled()) {
return (_PyMem_Debug.obj.alloc.malloc == _PyObject_MiMalloc);
}
else {
return (_PyObject.malloc == _PyObject_MiMalloc);
}
#endif
}
#endif // WITH_MIMALLOC
#endif // WITH_PYMALLOC
static void
set_up_debug_hooks_domain_unlocked(PyMemAllocatorDomain domain)
{
PyMemAllocatorEx alloc;
if (domain == PYMEM_DOMAIN_RAW) {
if (_PyMem_Raw.malloc == _PyMem_DebugRawMalloc) {
return;
}
get_allocator_unlocked(domain, &_PyMem_Debug.raw.alloc);
alloc.ctx = &_PyMem_Debug.raw;
alloc.malloc = _PyMem_DebugRawMalloc;
alloc.calloc = _PyMem_DebugRawCalloc;
alloc.realloc = _PyMem_DebugRawRealloc;
alloc.free = _PyMem_DebugRawFree;
set_allocator_unlocked(domain, &alloc);
}
else if (domain == PYMEM_DOMAIN_MEM) {
if (_PyMem.malloc == _PyMem_DebugMalloc) {
return;
}
get_allocator_unlocked(domain, &_PyMem_Debug.mem.alloc);
alloc.ctx = &_PyMem_Debug.mem;
alloc.malloc = _PyMem_DebugMalloc;
alloc.calloc = _PyMem_DebugCalloc;
alloc.realloc = _PyMem_DebugRealloc;
alloc.free = _PyMem_DebugFree;
set_allocator_unlocked(domain, &alloc);
}
else if (domain == PYMEM_DOMAIN_OBJ) {
if (_PyObject.malloc == _PyMem_DebugMalloc) {
return;
}
get_allocator_unlocked(domain, &_PyMem_Debug.obj.alloc);
alloc.ctx = &_PyMem_Debug.obj;
alloc.malloc = _PyMem_DebugMalloc;
alloc.calloc = _PyMem_DebugCalloc;
alloc.realloc = _PyMem_DebugRealloc;
alloc.free = _PyMem_DebugFree;
set_allocator_unlocked(domain, &alloc);
}
}
static void
set_up_debug_hooks_unlocked(void)
{
set_up_debug_hooks_domain_unlocked(PYMEM_DOMAIN_RAW);
set_up_debug_hooks_domain_unlocked(PYMEM_DOMAIN_MEM);
set_up_debug_hooks_domain_unlocked(PYMEM_DOMAIN_OBJ);
_PyRuntime.allocators.is_debug_enabled = 1;
}
void
PyMem_SetupDebugHooks(void)
{
PyMutex_Lock(&ALLOCATORS_MUTEX);
set_up_debug_hooks_unlocked();
PyMutex_Unlock(&ALLOCATORS_MUTEX);
}
static void
get_allocator_unlocked(PyMemAllocatorDomain domain, PyMemAllocatorEx *allocator)
{
switch(domain)
{
case PYMEM_DOMAIN_RAW: *allocator = _PyMem_Raw; break;
case PYMEM_DOMAIN_MEM: *allocator = _PyMem; break;
case PYMEM_DOMAIN_OBJ: *allocator = _PyObject; break;
default:
/* unknown domain: set all attributes to NULL */
allocator->ctx = NULL;
allocator->malloc = NULL;
allocator->calloc = NULL;
allocator->realloc = NULL;
allocator->free = NULL;
}
}
static void
set_allocator_unlocked(PyMemAllocatorDomain domain, PyMemAllocatorEx *allocator)
{
switch(domain)
{
case PYMEM_DOMAIN_RAW: _PyMem_Raw = *allocator; break;
case PYMEM_DOMAIN_MEM: _PyMem = *allocator; break;
case PYMEM_DOMAIN_OBJ: _PyObject = *allocator; break;
/* ignore unknown domain */
}
}
void
PyMem_GetAllocator(PyMemAllocatorDomain domain, PyMemAllocatorEx *allocator)
{
PyMutex_Lock(&ALLOCATORS_MUTEX);
get_allocator_unlocked(domain, allocator);
PyMutex_Unlock(&ALLOCATORS_MUTEX);
}
void
PyMem_SetAllocator(PyMemAllocatorDomain domain, PyMemAllocatorEx *allocator)
{
PyMutex_Lock(&ALLOCATORS_MUTEX);
set_allocator_unlocked(domain, allocator);
PyMutex_Unlock(&ALLOCATORS_MUTEX);
}
void
PyObject_GetArenaAllocator(PyObjectArenaAllocator *allocator)
{
PyMutex_Lock(&ALLOCATORS_MUTEX);
*allocator = _PyObject_Arena;
PyMutex_Unlock(&ALLOCATORS_MUTEX);
}
void
PyObject_SetArenaAllocator(PyObjectArenaAllocator *allocator)
{
PyMutex_Lock(&ALLOCATORS_MUTEX);
_PyObject_Arena = *allocator;
PyMutex_Unlock(&ALLOCATORS_MUTEX);
}
/* Note that there is a possible, but very unlikely, race in any place
* below where we call one of the allocator functions. We access two
* fields in each case: "malloc", etc. and "ctx".
*
* It is unlikely that the allocator will be changed while one of those
* calls is happening, much less in that very narrow window.
* Furthermore, the likelihood of a race is drastically reduced by the
* fact that the allocator may not be changed after runtime init
* (except with a wrapper).
*
* With the above in mind, we currently don't worry about locking
* around these uses of the runtime-global allocators state. */
/*************************/
/* the "arena" allocator */
/*************************/
void *
_PyObject_VirtualAlloc(size_t size)
{
return _PyObject_Arena.alloc(_PyObject_Arena.ctx, size);
}
void
_PyObject_VirtualFree(void *obj, size_t size)
{
_PyObject_Arena.free(_PyObject_Arena.ctx, obj, size);
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