cpython/Modules/_tracemalloc.c at master · python-emscripten/cpython · GitHub

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#include "Python.h"

#include "pycore_gc.h" // PyGC_Head

#include "pycore_pymem.h" // _Py_tracemalloc_config

#include "pycore_traceback.h"

#include "pycore_hashtable.h"

#include "frameobject.h" // PyFrame_GetBack()

#include "clinic/_tracemalloc.c.h"

/*[clinic input]

module _tracemalloc

[clinic start generated code]*/

/*[clinic end generated code: output=da39a3ee5e6b4b0d input=708a98302fc46e5f]*/

/* Trace memory blocks allocated by PyMem_RawMalloc() */

#define TRACE_RAW_MALLOC

/* Forward declaration */

static void tracemalloc_stop(void);

static void* raw_malloc(size_t size);

static void raw_free(void *ptr);

#ifdef Py_DEBUG

# define TRACE_DEBUG

#endif

#define TO_PTR(key) ((const void *)(uintptr_t)(key))

#define FROM_PTR(key) ((uintptr_t)(key))

/* Protected by the GIL */

static struct {

PyMemAllocatorEx mem;

PyMemAllocatorEx raw;

PyMemAllocatorEx obj;

} allocators;

#if defined(TRACE_RAW_MALLOC)

/* This lock is needed because tracemalloc_free() is called without

the GIL held from PyMem_RawFree(). It cannot acquire the lock because it

would introduce a deadlock in _PyThreadState_DeleteCurrent(). */

static PyThread_type_lock tables_lock;

# define TABLES_LOCK() PyThread_acquire_lock(tables_lock, 1)

# define TABLES_UNLOCK() PyThread_release_lock(tables_lock)

#else

/* variables are protected by the GIL */

# define TABLES_LOCK()

# define TABLES_UNLOCK()

#endif

#define DEFAULT_DOMAIN 0

/* Pack the frame_t structure to reduce the memory footprint on 64-bit

architectures: 12 bytes instead of 16. */

typedef struct

#ifdef __GNUC__

__attribute__((packed))

#elif defined(_MSC_VER)

#pragma pack(push, 4)

#endif

{

/* filename cannot be NULL: "<unknown>" is used if the Python frame

filename is NULL */

PyObject *filename;

unsigned int lineno;

} frame_t;

#ifdef _MSC_VER

#pragma pack(pop)

#endif

typedef struct {

Py_uhash_t hash;

/* Number of frames stored */

uint16_t nframe;

/* Total number of frames the traceback had */

uint16_t total_nframe;

frame_t frames[1];

} traceback_t;

#define TRACEBACK_SIZE(NFRAME) \

(sizeof(traceback_t) + sizeof(frame_t) * (NFRAME - 1))

/* The maximum number of frames is either:

- The maximum number of frames we can store in `traceback_t.nframe`

- The maximum memory size_t we can allocate */

static const unsigned long MAX_NFRAME = Py_MIN(UINT16_MAX, ((SIZE_MAX - sizeof(traceback_t)) / sizeof(frame_t) + 1));

static PyObject *unknown_filename = NULL;

static traceback_t tracemalloc_empty_traceback;

/* Trace of a memory block */

typedef struct {

/* Size of the memory block in bytes */

size_t size;

/* Traceback where the memory block was allocated */

traceback_t *traceback;

} trace_t;

/* Size in bytes of currently traced memory.

Protected by TABLES_LOCK(). */

static size_t tracemalloc_traced_memory = 0;

/* Peak size in bytes of traced memory.

Protected by TABLES_LOCK(). */

static size_t tracemalloc_peak_traced_memory = 0;

/* Hash table used as a set to intern filenames:

PyObject* => PyObject*.

Protected by the GIL */

static _Py_hashtable_t *tracemalloc_filenames = NULL;

/* Buffer to store a new traceback in traceback_new().

Protected by the GIL. */

static traceback_t *tracemalloc_traceback = NULL;

/* Hash table used as a set to intern tracebacks:

traceback_t* => traceback_t*

Protected by the GIL */

static _Py_hashtable_t *tracemalloc_tracebacks = NULL;

/* pointer (void*) => trace (trace_t*).

Protected by TABLES_LOCK(). */

static _Py_hashtable_t *tracemalloc_traces = NULL;

/* domain (unsigned int) => traces (_Py_hashtable_t).

Protected by TABLES_LOCK(). */

static _Py_hashtable_t *tracemalloc_domains = NULL;

#ifdef TRACE_DEBUG

static void

tracemalloc_error(const char *format, ...)

{

va_list ap;

fprintf(stderr, "tracemalloc: ");

va_start(ap, format);

vfprintf(stderr, format, ap);

va_end(ap);

fprintf(stderr, "\n");

fflush(stderr);

}

#endif

#if defined(TRACE_RAW_MALLOC)

#define REENTRANT_THREADLOCAL

static Py_tss_t tracemalloc_reentrant_key = Py_tss_NEEDS_INIT;

/* Any non-NULL pointer can be used */

#define REENTRANT Py_True

static int

get_reentrant(void)

{

void *ptr;

assert(PyThread_tss_is_created(&tracemalloc_reentrant_key));

ptr = PyThread_tss_get(&tracemalloc_reentrant_key);

if (ptr != NULL) {

assert(ptr == REENTRANT);

return 1;

}

else

return 0;

}

static void

set_reentrant(int reentrant)

{

assert(reentrant == 0 || reentrant == 1);

assert(PyThread_tss_is_created(&tracemalloc_reentrant_key));

if (reentrant) {

assert(!get_reentrant());

PyThread_tss_set(&tracemalloc_reentrant_key, REENTRANT);

}

else {

assert(get_reentrant());

PyThread_tss_set(&tracemalloc_reentrant_key, NULL);

}

#else

/* TRACE_RAW_MALLOC not defined: variable protected by the GIL */

static int tracemalloc_reentrant = 0;

static int

get_reentrant(void)

{

return tracemalloc_reentrant;

}

static void

set_reentrant(int reentrant)

{

assert(reentrant != tracemalloc_reentrant);

tracemalloc_reentrant = reentrant;

}

#endif

static Py_uhash_t

hashtable_hash_pyobject(const void *key)

{

PyObject *obj = (PyObject *)key;

return PyObject_Hash(obj);

}

static int

hashtable_compare_unicode(const void *key1, const void *key2)

{

PyObject *obj1 = (PyObject *)key1;

PyObject *obj2 = (PyObject *)key2;

if (obj1 != NULL && obj2 != NULL) {

return (PyUnicode_Compare(obj1, obj2) == 0);

}

else {

return obj1 == obj2;

}

static Py_uhash_t

hashtable_hash_uint(const void *key_raw)

{

unsigned int key = (unsigned int)FROM_PTR(key_raw);

return (Py_uhash_t)key;

}

static _Py_hashtable_t *

hashtable_new(_Py_hashtable_hash_func hash_func,

_Py_hashtable_compare_func compare_func,

_Py_hashtable_destroy_func key_destroy_func,

_Py_hashtable_destroy_func value_destroy_func)

{

_Py_hashtable_allocator_t hashtable_alloc = {malloc, free};

return _Py_hashtable_new_full(hash_func, compare_func,

key_destroy_func, value_destroy_func,

&hashtable_alloc);

}

static void*

raw_malloc(size_t size)

{

return allocators.raw.malloc(allocators.raw.ctx, size);

}

static void

raw_free(void *ptr)

{

allocators.raw.free(allocators.raw.ctx, ptr);

}

static Py_uhash_t

hashtable_hash_traceback(const void *key)

{

const traceback_t *traceback = (const traceback_t *)key;

return traceback->hash;

}

static int

hashtable_compare_traceback(const void *key1, const void *key2)

{

const traceback_t *traceback1 = (const traceback_t *)key1;

const traceback_t *traceback2 = (const traceback_t *)key2;

if (traceback1->nframe != traceback2->nframe) {

return 0;

}

if (traceback1->total_nframe != traceback2->total_nframe) {

return 0;

}

for (int i=0; i < traceback1->nframe; i++) {

const frame_t *frame1 = &traceback1->frames[i];

const frame_t *frame2 = &traceback2->frames[i];

if (frame1->lineno != frame2->lineno) {

return 0;

}

if (frame1->filename != frame2->filename) {

assert(PyUnicode_Compare(frame1->filename, frame2->filename) != 0);

return 0;

}

return 1;

}

static void

tracemalloc_get_frame(PyFrameObject *pyframe, frame_t *frame)

{

frame->filename = unknown_filename;

int lineno = PyFrame_GetLineNumber(pyframe);

if (lineno < 0) {

lineno = 0;

}

frame->lineno = (unsigned int)lineno;

PyCodeObject *code = PyFrame_GetCode(pyframe);

PyObject *filename = code->co_filename;

Py_DECREF(code);

if (filename == NULL) {

#ifdef TRACE_DEBUG

tracemalloc_error("failed to get the filename of the code object");

#endif

return;

}

assert(filename != NULL);

if (filename == NULL)

return;

if (!PyUnicode_Check(filename)) {

#ifdef TRACE_DEBUG

tracemalloc_error("filename is not a unicode string");

#endif

return;

}

if (!PyUnicode_IS_READY(filename)) {

/* Don't make a Unicode string ready to avoid reentrant calls

to tracemalloc_malloc() or tracemalloc_realloc() */

#ifdef TRACE_DEBUG

tracemalloc_error("filename is not a ready unicode string");

#endif

return;

}

/* intern the filename */

_Py_hashtable_entry_t *entry;

entry = _Py_hashtable_get_entry(tracemalloc_filenames, filename);

if (entry != NULL) {

filename = (PyObject *)entry->key;

}

else {

/* tracemalloc_filenames is responsible to keep a reference

to the filename */

Py_INCREF(filename);

if (_Py_hashtable_set(tracemalloc_filenames, filename, NULL) < 0) {

Py_DECREF(filename);

#ifdef TRACE_DEBUG

tracemalloc_error("failed to intern the filename");

#endif

return;

}

/* the tracemalloc_filenames table keeps a reference to the filename */

frame->filename = filename;

}

static Py_uhash_t

traceback_hash(traceback_t *traceback)

{

/* code based on tuplehash() of Objects/tupleobject.c */

Py_uhash_t x, y; /* Unsigned for defined overflow behavior. */

int len = traceback->nframe;

Py_uhash_t mult = _PyHASH_MULTIPLIER;

frame_t *frame;

x = 0x345678UL;

frame = traceback->frames;

while (--len >= 0) {

y = (Py_uhash_t)PyObject_Hash(frame->filename);

y ^= (Py_uhash_t)frame->lineno;

frame++;

x = (x ^ y) * mult;

/* the cast might truncate len; that doesn't change hash stability */

mult += (Py_uhash_t)(82520UL + len + len);

}

x ^= traceback->total_nframe;

x += 97531UL;

return x;

}

static void

traceback_get_frames(traceback_t *traceback)

{

PyThreadState *tstate = PyGILState_GetThisThreadState();

if (tstate == NULL) {

#ifdef TRACE_DEBUG

tracemalloc_error("failed to get the current thread state");

#endif

return;

}

PyFrameObject *pyframe = PyThreadState_GetFrame(tstate);

for (; pyframe != NULL;) {

if (traceback->nframe < _Py_tracemalloc_config.max_nframe) {

tracemalloc_get_frame(pyframe, &traceback->frames[traceback->nframe]);

assert(traceback->frames[traceback->nframe].filename != NULL);

traceback->nframe++;

}

if (traceback->total_nframe < UINT16_MAX) {

traceback->total_nframe++;

}

PyFrameObject *back = PyFrame_GetBack(pyframe);

Py_DECREF(pyframe);

pyframe = back;

}

static traceback_t *

traceback_new(void)

{

traceback_t *traceback;

_Py_hashtable_entry_t *entry;

assert(PyGILState_Check());

/* get frames */

traceback = tracemalloc_traceback;

traceback->nframe = 0;

traceback->total_nframe = 0;

traceback_get_frames(traceback);

if (traceback->nframe == 0)

return &tracemalloc_empty_traceback;

traceback->hash = traceback_hash(traceback);

/* intern the traceback */

entry = _Py_hashtable_get_entry(tracemalloc_tracebacks, traceback);

if (entry != NULL) {

traceback = (traceback_t *)entry->key;

}

else {

traceback_t *copy;

size_t traceback_size;

traceback_size = TRACEBACK_SIZE(traceback->nframe);

copy = raw_malloc(traceback_size);

if (copy == NULL) {

#ifdef TRACE_DEBUG

tracemalloc_error("failed to intern the traceback: malloc failed");

#endif

return NULL;

}

memcpy(copy, traceback, traceback_size);

if (_Py_hashtable_set(tracemalloc_tracebacks, copy, NULL) < 0) {

raw_free(copy);

#ifdef TRACE_DEBUG

tracemalloc_error("failed to intern the traceback: putdata failed");

#endif

return NULL;

}

traceback = copy;

}

return traceback;

}

static _Py_hashtable_t*

tracemalloc_create_traces_table(void)

{

return hashtable_new(_Py_hashtable_hash_ptr,

_Py_hashtable_compare_direct,

NULL, raw_free);

}

static _Py_hashtable_t*

tracemalloc_create_domains_table(void)

{

return hashtable_new(hashtable_hash_uint,

_Py_hashtable_compare_direct,

NULL,

(_Py_hashtable_destroy_func)_Py_hashtable_destroy);

}

static _Py_hashtable_t*

tracemalloc_get_traces_table(unsigned int domain)

{

if (domain == DEFAULT_DOMAIN) {

return tracemalloc_traces;

}

else {

return _Py_hashtable_get(tracemalloc_domains, TO_PTR(domain));

}

static void

tracemalloc_remove_trace(unsigned int domain, uintptr_t ptr)

{

assert(_Py_tracemalloc_config.tracing);

_Py_hashtable_t *traces = tracemalloc_get_traces_table(domain);

if (!traces) {

return;

}

trace_t *trace = _Py_hashtable_steal(traces, TO_PTR(ptr));

if (!trace) {

return;

}

assert(tracemalloc_traced_memory >= trace->size);

tracemalloc_traced_memory -= trace->size;

raw_free(trace);

}

#define REMOVE_TRACE(ptr) \

tracemalloc_remove_trace(DEFAULT_DOMAIN, (uintptr_t)(ptr))

static int

tracemalloc_add_trace(unsigned int domain, uintptr_t ptr,

size_t size)

{

assert(_Py_tracemalloc_config.tracing);

traceback_t *traceback = traceback_new();

if (traceback == NULL) {

return -1;

}

_Py_hashtable_t *traces = tracemalloc_get_traces_table(domain);

if (traces == NULL) {

traces = tracemalloc_create_traces_table();

if (traces == NULL) {

return -1;

}

if (_Py_hashtable_set(tracemalloc_domains, TO_PTR(domain), traces) < 0) {

_Py_hashtable_destroy(traces);

return -1;

}

trace_t *trace = _Py_hashtable_get(traces, TO_PTR(ptr));

if (trace != NULL) {

/* the memory block is already tracked */

assert(tracemalloc_traced_memory >= trace->size);

tracemalloc_traced_memory -= trace->size;

trace->size = size;

trace->traceback = traceback;

}

else {

trace = raw_malloc(sizeof(trace_t));

if (trace == NULL) {

return -1;

}

trace->size = size;

trace->traceback = traceback;

int res = _Py_hashtable_set(traces, TO_PTR(ptr), trace);

if (res != 0) {

raw_free(trace);

return res;

}

assert(tracemalloc_traced_memory <= SIZE_MAX - size);

tracemalloc_traced_memory += size;

if (tracemalloc_traced_memory > tracemalloc_peak_traced_memory) {

tracemalloc_peak_traced_memory = tracemalloc_traced_memory;

}

return 0;

}

#define ADD_TRACE(ptr, size) \

tracemalloc_add_trace(DEFAULT_DOMAIN, (uintptr_t)(ptr), size)

static void*

tracemalloc_alloc(int use_calloc, void *ctx, size_t nelem, size_t elsize)

{

PyMemAllocatorEx *alloc = (PyMemAllocatorEx *)ctx;

void *ptr;

assert(elsize == 0 || nelem <= SIZE_MAX / elsize);

if (use_calloc)

ptr = alloc->calloc(alloc->ctx, nelem, elsize);

else

ptr = alloc->malloc(alloc->ctx, nelem * elsize);

if (ptr == NULL)

return NULL;

TABLES_LOCK();

if (ADD_TRACE(ptr, nelem * elsize) < 0) {

/* Failed to allocate a trace for the new memory block */

TABLES_UNLOCK();

alloc->free(alloc->ctx, ptr);

return NULL;

}

TABLES_UNLOCK();

return ptr;

}

static void*

tracemalloc_realloc(void *ctx, void *ptr, size_t new_size)

{

PyMemAllocatorEx *alloc = (PyMemAllocatorEx *)ctx;

void *ptr2;

ptr2 = alloc->realloc(alloc->ctx, ptr, new_size);

if (ptr2 == NULL)

return NULL;

if (ptr != NULL) {

/* an existing memory block has been resized */

TABLES_LOCK();

/* tracemalloc_add_trace() updates the trace if there is already

a trace at address ptr2 */

if (ptr2 != ptr) {

REMOVE_TRACE(ptr);

}

if (ADD_TRACE(ptr2, new_size) < 0) {

/* Memory allocation failed. The error cannot be reported to

the caller, because realloc() may already have shrunk the

memory block and so removed bytes.

This case is very unlikely: a hash entry has just been

released, so the hash table should have at least one free entry.

The GIL and the table lock ensures that only one thread is

allocating memory. */

Py_FatalError("tracemalloc_realloc() failed to allocate a trace");

}

TABLES_UNLOCK();

}

else {

/* new allocation */

TABLES_LOCK();

if (ADD_TRACE(ptr2, new_size) < 0) {

/* Failed to allocate a trace for the new memory block */

TABLES_UNLOCK();

alloc->free(alloc->ctx, ptr2);

return NULL;

}

TABLES_UNLOCK();

}

return ptr2;

}

static void

tracemalloc_free(void *ctx, void *ptr)

{

PyMemAllocatorEx *alloc = (PyMemAllocatorEx *)ctx;

if (ptr == NULL)

return;

/* GIL cannot be locked in PyMem_RawFree() because it would introduce

a deadlock in _PyThreadState_DeleteCurrent(). */

alloc->free(alloc->ctx, ptr);

TABLES_LOCK();

REMOVE_TRACE(ptr);

TABLES_UNLOCK();

}

static void*

tracemalloc_alloc_gil(int use_calloc, void *ctx, size_t nelem, size_t elsize)

{

void *ptr;

if (get_reentrant()) {

PyMemAllocatorEx *alloc = (PyMemAllocatorEx *)ctx;

if (use_calloc)

return alloc->calloc(alloc->ctx, nelem, elsize);

else

return alloc->malloc(alloc->ctx, nelem * elsize);

}

/* Ignore reentrant call. PyObjet_Malloc() calls PyMem_Malloc() for

allocations larger than 512 bytes, don't trace the same memory

allocation twice. */

set_reentrant(1);

ptr = tracemalloc_alloc(use_calloc, ctx, nelem, elsize);

set_reentrant(0);

return ptr;

}

static void*

tracemalloc_malloc_gil(void *ctx, size_t size)

{

return tracemalloc_alloc_gil(0, ctx, 1, size);

}

static void*

tracemalloc_calloc_gil(void *ctx, size_t nelem, size_t elsize)

{

return tracemalloc_alloc_gil(1, ctx, nelem, elsize);

}

static void*

tracemalloc_realloc_gil(void *ctx, void *ptr, size_t new_size)

{

void *ptr2;

if (get_reentrant()) {

/* Reentrant call to PyMem_Realloc() and PyMem_RawRealloc().

Example: PyMem_RawRealloc() is called internally by pymalloc

(_PyObject_Malloc() and _PyObject_Realloc()) to allocate a new

arena (new_arena()). */

PyMemAllocatorEx *alloc = (PyMemAllocatorEx *)ctx;

ptr2 = alloc->realloc(alloc->ctx, ptr, new_size);

if (ptr2 != NULL && ptr != NULL) {

TABLES_LOCK();

REMOVE_TRACE(ptr);

TABLES_UNLOCK();

}

return ptr2;

}

/* Ignore reentrant call. PyObjet_Realloc() calls PyMem_Realloc() for

allocations larger than 512 bytes. Don't trace the same memory

allocation twice. */

set_reentrant(1);

ptr2 = tracemalloc_realloc(ctx, ptr, new_size);

set_reentrant(0);

return ptr2;

}

#ifdef TRACE_RAW_MALLOC

static void*

tracemalloc_raw_alloc(int use_calloc, void *ctx, size_t nelem, size_t elsize)

{

PyGILState_STATE gil_state;

void *ptr;

if (get_reentrant()) {

PyMemAllocatorEx *alloc = (PyMemAllocatorEx *)ctx;

if (use_calloc)

return alloc->calloc(alloc->ctx, nelem, elsize);

else

return alloc->malloc(alloc->ctx, nelem * elsize);

}

/* Ignore reentrant call. PyGILState_Ensure() may call PyMem_RawMalloc()

indirectly which would call PyGILState_Ensure() if reentrant are not

disabled. */

set_reentrant(1);

gil_state = PyGILState_Ensure();

ptr = tracemalloc_alloc(use_calloc, ctx, nelem, elsize);

PyGILState_Release(gil_state);

set_reentrant(0);

return ptr;

}

static void*

tracemalloc_raw_malloc(void *ctx, size_t size)

{

return tracemalloc_raw_alloc(0, ctx, 1, size);

}

static void*

tracemalloc_raw_calloc(void *ctx, size_t nelem, size_t elsize)

{

return tracemalloc_raw_alloc(1, ctx, nelem, elsize);

}

static void*

tracemalloc_raw_realloc(void *ctx, void *ptr, size_t new_size)

{

PyGILState_STATE gil_state;

void *ptr2;

if (get_reentrant()) {

/* Reentrant call to PyMem_RawRealloc(). */

PyMemAllocatorEx *alloc = (PyMemAllocatorEx *)ctx;

ptr2 = alloc->realloc(alloc->ctx, ptr, new_size);

if (ptr2 != NULL && ptr != NULL) {

TABLES_LOCK();

REMOVE_TRACE(ptr);

TABLES_UNLOCK();

}

return ptr2;

}

/* Ignore reentrant call. PyGILState_Ensure() may call PyMem_RawMalloc()

indirectly which would call PyGILState_Ensure() if reentrant calls are

not disabled. */

set_reentrant(1);

gil_state = PyGILState_Ensure();

ptr2 = tracemalloc_realloc(ctx, ptr, new_size);

PyGILState_Release(gil_state);

set_reentrant(0);

return ptr2;

}

#endif /* TRACE_RAW_MALLOC */

static void

tracemalloc_clear_filename(void *value)

{

PyObject *filename = (PyObject *)value;

Py_DECREF(filename);

}

/* reentrant flag must be set to call this function and GIL must be held */

static void

tracemalloc_clear_traces(void)

{

/* The GIL protects variables againt concurrent access */

assert(PyGILState_Check());

TABLES_LOCK();

_Py_hashtable_clear(tracemalloc_traces);

_Py_hashtable_clear(tracemalloc_domains);

tracemalloc_traced_memory = 0;

tracemalloc_peak_traced_memory = 0;

TABLES_UNLOCK();

_Py_hashtable_clear(tracemalloc_tracebacks);

_Py_hashtable_clear(tracemalloc_filenames);

}

static int

tracemalloc_init(void)

{

if (_Py_tracemalloc_config.initialized == TRACEMALLOC_FINALIZED) {

PyErr_SetString(PyExc_RuntimeError,

"the tracemalloc module has been unloaded");

return -1;

}

if (_Py_tracemalloc_config.initialized == TRACEMALLOC_INITIALIZED)

return 0;

PyMem_GetAllocator(PYMEM_DOMAIN_RAW, &allocators.raw);

#ifdef REENTRANT_THREADLOCAL

if (PyThread_tss_create(&tracemalloc_reentrant_key) != 0) {

#ifdef MS_WINDOWS

PyErr_SetFromWindowsErr(0);

#else

PyErr_SetFromErrno(PyExc_OSError);

#endif

return -1;

}

#endif

#if defined(TRACE_RAW_MALLOC)

if (tables_lock == NULL) {

tables_lock = PyThread_allocate_lock();

if (tables_lock == NULL) {

PyErr_SetString(PyExc_RuntimeError, "cannot allocate lock");

return -1;

}

#endif

tracemalloc_filenames = hashtable_new(hashtable_hash_pyobject,

hashtable_compare_unicode,

tracemalloc_clear_filename, NULL);

tracemalloc_tracebacks = hashtable_new(hashtable_hash_traceback,

hashtable_compare_traceback,

NULL, raw_free);

tracemalloc_traces = tracemalloc_create_traces_table();

tracemalloc_domains = tracemalloc_create_domains_table();

if (tracemalloc_filenames == NULL || tracemalloc_tracebacks == NULL

|| tracemalloc_traces == NULL || tracemalloc_domains == NULL) {

PyErr_NoMemory();

return -1;

}

unknown_filename = PyUnicode_FromString("<unknown>");

if (unknown_filename == NULL)

return -1;

PyUnicode_InternInPlace(&unknown_filename);

tracemalloc_empty_traceback.nframe = 1;

tracemalloc_empty_traceback.total_nframe = 1;

/* borrowed reference */

tracemalloc_empty_traceback.frames[0].filename = unknown_filename;

tracemalloc_empty_traceback.frames[0].lineno = 0;

tracemalloc_empty_traceback.hash = traceback_hash(&tracemalloc_empty_traceback);

_Py_tracemalloc_config.initialized = TRACEMALLOC_INITIALIZED;

return 0;

}

static void

tracemalloc_deinit(void)

{

if (_Py_tracemalloc_config.initialized != TRACEMALLOC_INITIALIZED)

return;

_Py_tracemalloc_config.initialized = TRACEMALLOC_FINALIZED;

tracemalloc_stop();

/* destroy hash tables */

_Py_hashtable_destroy(tracemalloc_domains);

_Py_hashtable_destroy(tracemalloc_traces);

_Py_hashtable_destroy(tracemalloc_tracebacks);

_Py_hashtable_destroy(tracemalloc_filenames);

#if defined(TRACE_RAW_MALLOC)

if (tables_lock != NULL) {

PyThread_free_lock(tables_lock);

tables_lock = NULL;

}

#endif

#ifdef REENTRANT_THREADLOCAL

PyThread_tss_delete(&tracemalloc_reentrant_key);

#endif

Py_XDECREF(unknown_filename);

}

static int

tracemalloc_start(int max_nframe)

{

PyMemAllocatorEx alloc;

size_t size;

if (max_nframe < 1 || (unsigned long) max_nframe > MAX_NFRAME) {

PyErr_Format(PyExc_ValueError,

"the number of frames must be in range [1; %lu]",

MAX_NFRAME);

return -1;

}

if (tracemalloc_init() < 0) {

return -1;

}

if (_Py_tracemalloc_config.tracing) {

/* hook already installed: do nothing */

return 0;

}

_Py_tracemalloc_config.max_nframe = max_nframe;

/* allocate a buffer to store a new traceback */

size = TRACEBACK_SIZE(max_nframe);

assert(tracemalloc_traceback == NULL);

tracemalloc_traceback = raw_malloc(size);

if (tracemalloc_traceback == NULL) {

PyErr_NoMemory();

return -1;

}

#ifdef TRACE_RAW_MALLOC

alloc.malloc = tracemalloc_raw_malloc;

alloc.calloc = tracemalloc_raw_calloc;

alloc.realloc = tracemalloc_raw_realloc;

alloc.free = tracemalloc_free;

alloc.ctx = &allocators.raw;

PyMem_GetAllocator(PYMEM_DOMAIN_RAW, &allocators.raw);

PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &alloc);

#endif

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