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cpython/Objects/codeobject.c

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#include <stdbool.h>
#include "Python.h"
#include "opcode.h"
#include "pycore_code.h" // _PyCodeConstructor
#include "pycore_frame.h" // FRAME_SPECIALS_SIZE
#include "pycore_hashtable.h" // _Py_hashtable_t
#include "pycore_index_pool.h" // _PyIndexPool
#include "pycore_initconfig.h" // _PyStatus_OK()
#include "pycore_interp.h" // PyInterpreterState.co_extra_freefuncs
#include "pycore_object.h" // _PyObject_SetDeferredRefcount
#include "pycore_object_stack.h"
#include "pycore_opcode_metadata.h" // _PyOpcode_Deopt, _PyOpcode_Caches
#include "pycore_opcode_utils.h" // RESUME_AT_FUNC_START
#include "pycore_pymem.h" // _PyMem_FreeDelayed
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "pycore_setobject.h" // _PySet_NextEntry()
#include "pycore_tuple.h" // _PyTuple_ITEMS()
#include "pycore_uniqueid.h" // _PyObject_AssignUniqueId()
#include "clinic/codeobject.c.h"
#define INITIAL_SPECIALIZED_CODE_SIZE 16
static const char *
code_event_name(PyCodeEvent event) {
switch (event) {
#define CASE(op) \
case PY_CODE_EVENT_##op: \
return "PY_CODE_EVENT_" #op;
PY_FOREACH_CODE_EVENT(CASE)
#undef CASE
}
Py_UNREACHABLE();
}
static void
notify_code_watchers(PyCodeEvent event, PyCodeObject *co)
{
assert(Py_REFCNT(co) > 0);
PyInterpreterState *interp = _PyInterpreterState_GET();
assert(interp->_initialized);
uint8_t bits = interp->active_code_watchers;
int i = 0;
while (bits) {
assert(i < CODE_MAX_WATCHERS);
if (bits & 1) {
PyCode_WatchCallback cb = interp->code_watchers[i];
// callback must be non-null if the watcher bit is set
assert(cb != NULL);
if (cb(event, co) < 0) {
PyErr_FormatUnraisable(
"Exception ignored in %s watcher callback for %R",
code_event_name(event), co);
}
}
i++;
bits >>= 1;
}
}
int
PyCode_AddWatcher(PyCode_WatchCallback callback)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
assert(interp->_initialized);
for (int i = 0; i < CODE_MAX_WATCHERS; i++) {
if (!interp->code_watchers[i]) {
interp->code_watchers[i] = callback;
interp->active_code_watchers |= (1 << i);
return i;
}
}
PyErr_SetString(PyExc_RuntimeError, "no more code watcher IDs available");
return -1;
}
static inline int
validate_watcher_id(PyInterpreterState *interp, int watcher_id)
{
if (watcher_id < 0 || watcher_id >= CODE_MAX_WATCHERS) {
PyErr_Format(PyExc_ValueError, "Invalid code watcher ID %d", watcher_id);
return -1;
}
if (!interp->code_watchers[watcher_id]) {
PyErr_Format(PyExc_ValueError, "No code watcher set for ID %d", watcher_id);
return -1;
}
return 0;
}
int
PyCode_ClearWatcher(int watcher_id)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
assert(interp->_initialized);
if (validate_watcher_id(interp, watcher_id) < 0) {
return -1;
}
interp->code_watchers[watcher_id] = NULL;
interp->active_code_watchers &= ~(1 << watcher_id);
return 0;
}
/******************
* generic helpers
******************/
static int
should_intern_string(PyObject *o)
{
#ifdef Py_GIL_DISABLED
// The free-threaded build interns (and immortalizes) all string constants
return 1;
#else
// compute if s matches [a-zA-Z0-9_]
const unsigned char *s, *e;
if (!PyUnicode_IS_ASCII(o))
return 0;
s = PyUnicode_1BYTE_DATA(o);
e = s + PyUnicode_GET_LENGTH(o);
for (; s != e; s++) {
if (!Py_ISALNUM(*s) && *s != '_')
return 0;
}
return 1;
#endif
}
#ifdef Py_GIL_DISABLED
static PyObject *intern_one_constant(PyObject *op);
#endif
static int
intern_strings(PyObject *tuple)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
Py_ssize_t i;
for (i = PyTuple_GET_SIZE(tuple); --i >= 0; ) {
PyObject *v = PyTuple_GET_ITEM(tuple, i);
if (v == NULL || !PyUnicode_CheckExact(v)) {
PyErr_SetString(PyExc_SystemError,
"non-string found in code slot");
return -1;
}
_PyUnicode_InternImmortal(interp, &_PyTuple_ITEMS(tuple)[i]);
}
return 0;
}
/* Intern constants. In the default build, this interns selected string
constants. In the free-threaded build, this also interns non-string
constants. */
static int
intern_constants(PyObject *tuple, int *modified)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
for (Py_ssize_t i = PyTuple_GET_SIZE(tuple); --i >= 0; ) {
PyObject *v = PyTuple_GET_ITEM(tuple, i);
if (PyUnicode_CheckExact(v)) {
if (should_intern_string(v)) {
PyObject *w = v;
_PyUnicode_InternMortal(interp, &v);
if (w != v) {
PyTuple_SET_ITEM(tuple, i, v);
if (modified) {
*modified = 1;
}
}
}
}
else if (PyTuple_CheckExact(v)) {
if (intern_constants(v, NULL) < 0) {
return -1;
}
}
else if (PyFrozenSet_CheckExact(v)) {
PyObject *w = v;
PyObject *tmp = PySequence_Tuple(v);
if (tmp == NULL) {
return -1;
}
int tmp_modified = 0;
if (intern_constants(tmp, &tmp_modified) < 0) {
Py_DECREF(tmp);
return -1;
}
if (tmp_modified) {
v = PyFrozenSet_New(tmp);
if (v == NULL) {
Py_DECREF(tmp);
return -1;
}
PyTuple_SET_ITEM(tuple, i, v);
Py_DECREF(w);
if (modified) {
*modified = 1;
}
}
Py_DECREF(tmp);
}
#ifdef Py_GIL_DISABLED
else if (PySlice_Check(v)) {
PySliceObject *slice = (PySliceObject *)v;
PyObject *tmp = PyTuple_New(3);
if (tmp == NULL) {
return -1;
}
PyTuple_SET_ITEM(tmp, 0, Py_NewRef(slice->start));
PyTuple_SET_ITEM(tmp, 1, Py_NewRef(slice->stop));
PyTuple_SET_ITEM(tmp, 2, Py_NewRef(slice->step));
int tmp_modified = 0;
if (intern_constants(tmp, &tmp_modified) < 0) {
Py_DECREF(tmp);
return -1;
}
if (tmp_modified) {
v = PySlice_New(PyTuple_GET_ITEM(tmp, 0),
PyTuple_GET_ITEM(tmp, 1),
PyTuple_GET_ITEM(tmp, 2));
if (v == NULL) {
Py_DECREF(tmp);
return -1;
}
PyTuple_SET_ITEM(tuple, i, v);
Py_DECREF(slice);
if (modified) {
*modified = 1;
}
}
Py_DECREF(tmp);
}
// Intern non-string constants in the free-threaded build
_PyThreadStateImpl *tstate = (_PyThreadStateImpl *)_PyThreadState_GET();
if (!_Py_IsImmortal(v) && !PyCode_Check(v) &&
!PyUnicode_CheckExact(v) && !tstate->suppress_co_const_immortalization)
{
PyObject *interned = intern_one_constant(v);
if (interned == NULL) {
return -1;
}
else if (interned != v) {
PyTuple_SET_ITEM(tuple, i, interned);
Py_SETREF(v, interned);
if (modified) {
*modified = 1;
}
}
}
#endif
}
return 0;
}
/* Return a shallow copy of a tuple that is
guaranteed to contain exact strings, by converting string subclasses
to exact strings and complaining if a non-string is found. */
static PyObject*
validate_and_copy_tuple(PyObject *tup)
{
PyObject *newtuple;
PyObject *item;
Py_ssize_t i, len;
len = PyTuple_GET_SIZE(tup);
newtuple = PyTuple_New(len);
if (newtuple == NULL)
return NULL;
for (i = 0; i < len; i++) {
item = PyTuple_GET_ITEM(tup, i);
if (PyUnicode_CheckExact(item)) {
Py_INCREF(item);
}
else if (!PyUnicode_Check(item)) {
PyErr_Format(
PyExc_TypeError,
"name tuples must contain only "
"strings, not '%.500s'",
Py_TYPE(item)->tp_name);
Py_DECREF(newtuple);
return NULL;
}
else {
item = _PyUnicode_Copy(item);
if (item == NULL) {
Py_DECREF(newtuple);
return NULL;
}
}
PyTuple_SET_ITEM(newtuple, i, item);
}
return newtuple;
}
static int
init_co_cached(PyCodeObject *self)
{
_PyCoCached *cached = FT_ATOMIC_LOAD_PTR(self->_co_cached);
if (cached != NULL) {
return 0;
}
Py_BEGIN_CRITICAL_SECTION(self);
cached = self->_co_cached;
if (cached == NULL) {
cached = PyMem_New(_PyCoCached, 1);
if (cached == NULL) {
PyErr_NoMemory();
}
else {
cached->_co_code = NULL;
cached->_co_cellvars = NULL;
cached->_co_freevars = NULL;
cached->_co_varnames = NULL;
FT_ATOMIC_STORE_PTR(self->_co_cached, cached);
}
}
Py_END_CRITICAL_SECTION();
return cached != NULL ? 0 : -1;
}
/******************
* _PyCode_New()
******************/
// This is also used in compile.c.
void
_Py_set_localsplus_info(int offset, PyObject *name, _PyLocals_Kind kind,
PyObject *names, PyObject *kinds)
{
PyTuple_SET_ITEM(names, offset, Py_NewRef(name));
_PyLocals_SetKind(kinds, offset, kind);
}
static void
get_localsplus_counts(PyObject *names, PyObject *kinds,
int *pnlocals, int *pncellvars,
int *pnfreevars)
{
int nlocals = 0;
int ncellvars = 0;
int nfreevars = 0;
Py_ssize_t nlocalsplus = PyTuple_GET_SIZE(names);
for (int i = 0; i < nlocalsplus; i++) {
_PyLocals_Kind kind = _PyLocals_GetKind(kinds, i);
if (kind & CO_FAST_LOCAL) {
nlocals += 1;
if (kind & CO_FAST_CELL) {
ncellvars += 1;
}
}
else if (kind & CO_FAST_CELL) {
ncellvars += 1;
}
else if (kind & CO_FAST_FREE) {
nfreevars += 1;
}
}
if (pnlocals != NULL) {
*pnlocals = nlocals;
}
if (pncellvars != NULL) {
*pncellvars = ncellvars;
}
if (pnfreevars != NULL) {
*pnfreevars = nfreevars;
}
}
static PyObject *
get_localsplus_names(PyCodeObject *co, _PyLocals_Kind kind, int num)
{
PyObject *names = PyTuple_New(num);
if (names == NULL) {
return NULL;
}
int index = 0;
for (int offset = 0; offset < co->co_nlocalsplus; offset++) {
_PyLocals_Kind k = _PyLocals_GetKind(co->co_localspluskinds, offset);
if ((k & kind) == 0) {
continue;
}
assert(index < num);
PyObject *name = PyTuple_GET_ITEM(co->co_localsplusnames, offset);
PyTuple_SET_ITEM(names, index, Py_NewRef(name));
index += 1;
}
assert(index == num);
return names;
}
int
_PyCode_Validate(struct _PyCodeConstructor *con)
{
/* Check argument types */
if (con->argcount < con->posonlyargcount || con->posonlyargcount < 0 ||
con->kwonlyargcount < 0 ||
con->stacksize < 0 || con->flags < 0 ||
con->code == NULL || !PyBytes_Check(con->code) ||
con->consts == NULL || !PyTuple_Check(con->consts) ||
con->names == NULL || !PyTuple_Check(con->names) ||
con->localsplusnames == NULL || !PyTuple_Check(con->localsplusnames) ||
con->localspluskinds == NULL || !PyBytes_Check(con->localspluskinds) ||
PyTuple_GET_SIZE(con->localsplusnames)
!= PyBytes_GET_SIZE(con->localspluskinds) ||
con->name == NULL || !PyUnicode_Check(con->name) ||
con->qualname == NULL || !PyUnicode_Check(con->qualname) ||
con->filename == NULL || !PyUnicode_Check(con->filename) ||
con->linetable == NULL || !PyBytes_Check(con->linetable) ||
con->exceptiontable == NULL || !PyBytes_Check(con->exceptiontable)
) {
PyErr_BadInternalCall();
return -1;
}
/* Make sure that code is indexable with an int, this is
a long running assumption in ceval.c and many parts of
the interpreter. */
if (PyBytes_GET_SIZE(con->code) > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"code: co_code larger than INT_MAX");
return -1;
}
if (PyBytes_GET_SIZE(con->code) % sizeof(_Py_CODEUNIT) != 0 ||
!_Py_IS_ALIGNED(PyBytes_AS_STRING(con->code), sizeof(_Py_CODEUNIT))
) {
PyErr_SetString(PyExc_ValueError, "code: co_code is malformed");
return -1;
}
/* Ensure that the co_varnames has enough names to cover the arg counts.
* Note that totalargs = nlocals - nplainlocals. We check nplainlocals
* here to avoid the possibility of overflow (however remote). */
int nlocals;
get_localsplus_counts(con->localsplusnames, con->localspluskinds,
&nlocals, NULL, NULL);
int nplainlocals = nlocals -
con->argcount -
con->kwonlyargcount -
((con->flags & CO_VARARGS) != 0) -
((con->flags & CO_VARKEYWORDS) != 0);
if (nplainlocals < 0) {
PyErr_SetString(PyExc_ValueError, "code: co_varnames is too small");
return -1;
}
return 0;
}
extern void
_PyCode_Quicken(_Py_CODEUNIT *instructions, Py_ssize_t size, PyObject *consts,
int enable_counters);
#ifdef Py_GIL_DISABLED
static _PyCodeArray * _PyCodeArray_New(Py_ssize_t size);
#endif
static int
init_code(PyCodeObject *co, struct _PyCodeConstructor *con)
{
int nlocalsplus = (int)PyTuple_GET_SIZE(con->localsplusnames);
int nlocals, ncellvars, nfreevars;
get_localsplus_counts(con->localsplusnames, con->localspluskinds,
&nlocals, &ncellvars, &nfreevars);
if (con->stacksize == 0) {
con->stacksize = 1;
}
PyInterpreterState *interp = _PyInterpreterState_GET();
co->co_filename = Py_NewRef(con->filename);
co->co_name = Py_NewRef(con->name);
co->co_qualname = Py_NewRef(con->qualname);
_PyUnicode_InternMortal(interp, &co->co_filename);
_PyUnicode_InternMortal(interp, &co->co_name);
_PyUnicode_InternMortal(interp, &co->co_qualname);
co->co_flags = con->flags;
co->co_firstlineno = con->firstlineno;
co->co_linetable = Py_NewRef(con->linetable);
co->co_consts = Py_NewRef(con->consts);
co->co_names = Py_NewRef(con->names);
co->co_localsplusnames = Py_NewRef(con->localsplusnames);
co->co_localspluskinds = Py_NewRef(con->localspluskinds);
co->co_argcount = con->argcount;
co->co_posonlyargcount = con->posonlyargcount;
co->co_kwonlyargcount = con->kwonlyargcount;
co->co_stacksize = con->stacksize;
co->co_exceptiontable = Py_NewRef(con->exceptiontable);
/* derived values */
co->co_nlocalsplus = nlocalsplus;
co->co_nlocals = nlocals;
co->co_framesize = nlocalsplus + con->stacksize + FRAME_SPECIALS_SIZE;
co->co_ncellvars = ncellvars;
co->co_nfreevars = nfreevars;
#ifdef Py_GIL_DISABLED
PyMutex_Lock(&interp->func_state.mutex);
#endif
co->co_version = interp->func_state.next_version;
if (interp->func_state.next_version != 0) {
interp->func_state.next_version++;
}
#ifdef Py_GIL_DISABLED
PyMutex_Unlock(&interp->func_state.mutex);
#endif
co->_co_monitoring = NULL;
co->_co_instrumentation_version = 0;
/* not set */
co->co_weakreflist = NULL;
co->co_extra = NULL;
co->_co_cached = NULL;
co->co_executors = NULL;
memcpy(_PyCode_CODE(co), PyBytes_AS_STRING(con->code),
PyBytes_GET_SIZE(con->code));
#ifdef Py_GIL_DISABLED
co->co_tlbc = _PyCodeArray_New(INITIAL_SPECIALIZED_CODE_SIZE);
if (co->co_tlbc == NULL) {
return -1;
}
co->co_tlbc->entries[0] = co->co_code_adaptive;
#endif
int entry_point = 0;
while (entry_point < Py_SIZE(co) &&
_PyCode_CODE(co)[entry_point].op.code != RESUME) {
entry_point++;
}
co->_co_firsttraceable = entry_point;
#ifdef Py_GIL_DISABLED
_PyCode_Quicken(_PyCode_CODE(co), Py_SIZE(co), co->co_consts,
interp->config.tlbc_enabled);
#else
_PyCode_Quicken(_PyCode_CODE(co), Py_SIZE(co), co->co_consts, 1);
#endif
notify_code_watchers(PY_CODE_EVENT_CREATE, co);
return 0;
}
static int
scan_varint(const uint8_t *ptr)
{
unsigned int read = *ptr++;
unsigned int val = read & 63;
unsigned int shift = 0;
while (read & 64) {
read = *ptr++;
shift += 6;
val |= (read & 63) << shift;
}
return val;
}
static int
scan_signed_varint(const uint8_t *ptr)
{
unsigned int uval = scan_varint(ptr);
if (uval & 1) {
return -(int)(uval >> 1);
}
else {
return uval >> 1;
}
}
static int
get_line_delta(const uint8_t *ptr)
{
int code = ((*ptr) >> 3) & 15;
switch (code) {
case PY_CODE_LOCATION_INFO_NONE:
return 0;
case PY_CODE_LOCATION_INFO_NO_COLUMNS:
case PY_CODE_LOCATION_INFO_LONG:
return scan_signed_varint(ptr+1);
case PY_CODE_LOCATION_INFO_ONE_LINE0:
return 0;
case PY_CODE_LOCATION_INFO_ONE_LINE1:
return 1;
case PY_CODE_LOCATION_INFO_ONE_LINE2:
return 2;
default:
/* Same line */
return 0;
}
}
static PyObject *
remove_column_info(PyObject *locations)
{
Py_ssize_t offset = 0;
const uint8_t *data = (const uint8_t *)PyBytes_AS_STRING(locations);
PyObject *res = PyBytes_FromStringAndSize(NULL, 32);
if (res == NULL) {
PyErr_NoMemory();
return NULL;
}
uint8_t *output = (uint8_t *)PyBytes_AS_STRING(res);
while (offset < PyBytes_GET_SIZE(locations)) {
Py_ssize_t write_offset = output - (uint8_t *)PyBytes_AS_STRING(res);
if (write_offset + 16 >= PyBytes_GET_SIZE(res)) {
if (_PyBytes_Resize(&res, PyBytes_GET_SIZE(res) * 2) < 0) {
return NULL;
}
output = (uint8_t *)PyBytes_AS_STRING(res) + write_offset;
}
int code = (data[offset] >> 3) & 15;
if (code == PY_CODE_LOCATION_INFO_NONE) {
*output++ = data[offset];
}
else {
int blength = (data[offset] & 7)+1;
output += write_location_entry_start(
output, PY_CODE_LOCATION_INFO_NO_COLUMNS, blength);
int ldelta = get_line_delta(&data[offset]);
output += write_signed_varint(output, ldelta);
}
offset++;
while (offset < PyBytes_GET_SIZE(locations) &&
(data[offset] & 128) == 0) {
offset++;
}
}
Py_ssize_t write_offset = output - (uint8_t *)PyBytes_AS_STRING(res);
if (_PyBytes_Resize(&res, write_offset)) {
return NULL;
}
return res;
}
static int
intern_code_constants(struct _PyCodeConstructor *con)
{
#ifdef Py_GIL_DISABLED
PyInterpreterState *interp = _PyInterpreterState_GET();
struct _py_code_state *state = &interp->code_state;
PyMutex_Lock(&state->mutex);
#endif
if (intern_strings(con->names) < 0) {
goto error;
}
if (intern_constants(con->consts, NULL) < 0) {
goto error;
}
if (intern_strings(con->localsplusnames) < 0) {
goto error;
}
#ifdef Py_GIL_DISABLED
PyMutex_Unlock(&state->mutex);
#endif
return 0;
error:
#ifdef Py_GIL_DISABLED
PyMutex_Unlock(&state->mutex);
#endif
return -1;
}
/* The caller is responsible for ensuring that the given data is valid. */
PyCodeObject *
_PyCode_New(struct _PyCodeConstructor *con)
{
if (intern_code_constants(con) < 0) {
return NULL;
}
PyObject *replacement_locations = NULL;
// Compact the linetable if we are opted out of debug
// ranges.
if (!_Py_GetConfig()->code_debug_ranges) {
replacement_locations = remove_column_info(con->linetable);
if (replacement_locations == NULL) {
return NULL;
}
con->linetable = replacement_locations;
}
Py_ssize_t size = PyBytes_GET_SIZE(con->code) / sizeof(_Py_CODEUNIT);
PyCodeObject *co;
#ifdef Py_GIL_DISABLED
co = PyObject_GC_NewVar(PyCodeObject, &PyCode_Type, size);
#else
co = PyObject_NewVar(PyCodeObject, &PyCode_Type, size);
#endif
if (co == NULL) {
Py_XDECREF(replacement_locations);
PyErr_NoMemory();
return NULL;
}
if (init_code(co, con) < 0) {
Py_DECREF(co);
return NULL;
}
#ifdef Py_GIL_DISABLED
co->_co_unique_id = _PyObject_AssignUniqueId((PyObject *)co);
_PyObject_GC_TRACK(co);
#endif
Py_XDECREF(replacement_locations);
return co;
}
/******************
* the legacy "constructors"
******************/
PyCodeObject *
PyUnstable_Code_NewWithPosOnlyArgs(
int argcount, int posonlyargcount, int kwonlyargcount,
int nlocals, int stacksize, int flags,
PyObject *code, PyObject *consts, PyObject *names,
PyObject *varnames, PyObject *freevars, PyObject *cellvars,
PyObject *filename, PyObject *name,
PyObject *qualname, int firstlineno,
PyObject *linetable,
PyObject *exceptiontable)
{
PyCodeObject *co = NULL;
PyObject *localsplusnames = NULL;
PyObject *localspluskinds = NULL;
if (varnames == NULL || !PyTuple_Check(varnames) ||
cellvars == NULL || !PyTuple_Check(cellvars) ||
freevars == NULL || !PyTuple_Check(freevars)
) {
PyErr_BadInternalCall();
return NULL;
}
// Set the "fast locals plus" info.
int nvarnames = (int)PyTuple_GET_SIZE(varnames);
int ncellvars = (int)PyTuple_GET_SIZE(cellvars);
int nfreevars = (int)PyTuple_GET_SIZE(freevars);
int nlocalsplus = nvarnames + ncellvars + nfreevars;
localsplusnames = PyTuple_New(nlocalsplus);
if (localsplusnames == NULL) {
goto error;
}
localspluskinds = PyBytes_FromStringAndSize(NULL, nlocalsplus);
if (localspluskinds == NULL) {
goto error;
}
int offset = 0;
for (int i = 0; i < nvarnames; i++, offset++) {
PyObject *name = PyTuple_GET_ITEM(varnames, i);
_Py_set_localsplus_info(offset, name, CO_FAST_LOCAL,
localsplusnames, localspluskinds);
}
for (int i = 0; i < ncellvars; i++, offset++) {
PyObject *name = PyTuple_GET_ITEM(cellvars, i);
int argoffset = -1;
for (int j = 0; j < nvarnames; j++) {
int cmp = PyUnicode_Compare(PyTuple_GET_ITEM(varnames, j),
name);
assert(!PyErr_Occurred());
if (cmp == 0) {
argoffset = j;
break;
}
}
if (argoffset >= 0) {
// Merge the localsplus indices.
nlocalsplus -= 1;
offset -= 1;
_PyLocals_Kind kind = _PyLocals_GetKind(localspluskinds, argoffset);
_PyLocals_SetKind(localspluskinds, argoffset, kind | CO_FAST_CELL);
continue;
}
_Py_set_localsplus_info(offset, name, CO_FAST_CELL,
localsplusnames, localspluskinds);
}
for (int i = 0; i < nfreevars; i++, offset++) {
PyObject *name = PyTuple_GET_ITEM(freevars, i);
_Py_set_localsplus_info(offset, name, CO_FAST_FREE,
localsplusnames, localspluskinds);
}
// gh-110543: Make sure the CO_FAST_HIDDEN flag is set correctly.
if (!(flags & CO_OPTIMIZED)) {
Py_ssize_t code_len = PyBytes_GET_SIZE(code);
_Py_CODEUNIT *code_data = (_Py_CODEUNIT *)PyBytes_AS_STRING(code);
Py_ssize_t num_code_units = code_len / sizeof(_Py_CODEUNIT);
int extended_arg = 0;
for (int i = 0; i < num_code_units; i += 1 + _PyOpcode_Caches[code_data[i].op.code]) {
_Py_CODEUNIT *instr = &code_data[i];
uint8_t opcode = instr->op.code;
if (opcode == EXTENDED_ARG) {
extended_arg = extended_arg << 8 | instr->op.arg;
continue;
}
if (opcode == LOAD_FAST_AND_CLEAR) {
int oparg = extended_arg << 8 | instr->op.arg;
if (oparg >= nlocalsplus) {
PyErr_Format(PyExc_ValueError,
"code: LOAD_FAST_AND_CLEAR oparg %d out of range",
oparg);
goto error;
}
_PyLocals_Kind kind = _PyLocals_GetKind(localspluskinds, oparg);
_PyLocals_SetKind(localspluskinds, oparg, kind | CO_FAST_HIDDEN);
}
extended_arg = 0;
}
}
// If any cells were args then nlocalsplus will have shrunk.
if (nlocalsplus != PyTuple_GET_SIZE(localsplusnames)) {
if (_PyTuple_Resize(&localsplusnames, nlocalsplus) < 0
|| _PyBytes_Resize(&localspluskinds, nlocalsplus) < 0) {
goto error;
}
}
struct _PyCodeConstructor con = {
.filename = filename,
.name = name,
.qualname = qualname,
.flags = flags,
.code = code,
.firstlineno = firstlineno,
.linetable = linetable,
.consts = consts,
.names = names,
.localsplusnames = localsplusnames,
.localspluskinds = localspluskinds,
.argcount = argcount,
.posonlyargcount = posonlyargcount,
.kwonlyargcount = kwonlyargcount,
.stacksize = stacksize,
.exceptiontable = exceptiontable,
};
if (_PyCode_Validate(&con) < 0) {
goto error;
}
assert(PyBytes_GET_SIZE(code) % sizeof(_Py_CODEUNIT) == 0);
assert(_Py_IS_ALIGNED(PyBytes_AS_STRING(code), sizeof(_Py_CODEUNIT)));
if (nlocals != PyTuple_GET_SIZE(varnames)) {
PyErr_SetString(PyExc_ValueError,
"code: co_nlocals != len(co_varnames)");
goto error;
}
co = _PyCode_New(&con);
if (co == NULL) {
goto error;
}
error:
Py_XDECREF(localsplusnames);
Py_XDECREF(localspluskinds);
return co;
}
PyCodeObject *
PyUnstable_Code_New(int argcount, int kwonlyargcount,
int nlocals, int stacksize, int flags,
PyObject *code, PyObject *consts, PyObject *names,
PyObject *varnames, PyObject *freevars, PyObject *cellvars,
PyObject *filename, PyObject *name, PyObject *qualname,
int firstlineno,
PyObject *linetable,
PyObject *exceptiontable)
{
return PyCode_NewWithPosOnlyArgs(argcount, 0, kwonlyargcount, nlocals,
stacksize, flags, code, consts, names,
varnames, freevars, cellvars, filename,
name, qualname, firstlineno,
linetable,
exceptiontable);
}
// NOTE: When modifying the construction of PyCode_NewEmpty, please also change
// test.test_code.CodeLocationTest.test_code_new_empty to keep it in sync!
static const uint8_t assert0[6] = {
RESUME, RESUME_AT_FUNC_START,
LOAD_COMMON_CONSTANT, CONSTANT_ASSERTIONERROR,
RAISE_VARARGS, 1
};
static const uint8_t linetable[2] = {
(1 << 7) // New entry.
| (PY_CODE_LOCATION_INFO_NO_COLUMNS << 3)
| (3 - 1), // Three code units.
0, // Offset from co_firstlineno.
};
PyCodeObject *
PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)
{
PyObject *nulltuple = NULL;
PyObject *filename_ob = NULL;
PyObject *funcname_ob = NULL;
PyObject *code_ob = NULL;
PyObject *linetable_ob = NULL;
PyCodeObject *result = NULL;
nulltuple = PyTuple_New(0);
if (nulltuple == NULL) {
goto failed;
}
funcname_ob = PyUnicode_FromString(funcname);
if (funcname_ob == NULL) {
goto failed;
}
filename_ob = PyUnicode_DecodeFSDefault(filename);
if (filename_ob == NULL) {
goto failed;
}
code_ob = PyBytes_FromStringAndSize((const char *)assert0, 6);
if (code_ob == NULL) {
goto failed;
}
linetable_ob = PyBytes_FromStringAndSize((const char *)linetable, 2);
if (linetable_ob == NULL) {
goto failed;
}
#define emptystring (PyObject *)&_Py_SINGLETON(bytes_empty)
struct _PyCodeConstructor con = {
.filename = filename_ob,
.name = funcname_ob,
.qualname = funcname_ob,
.code = code_ob,
.firstlineno = firstlineno,
.linetable = linetable_ob,
.consts = nulltuple,
.names = nulltuple,
.localsplusnames = nulltuple,
.localspluskinds = emptystring,
.exceptiontable = emptystring,
.stacksize = 1,
};
result = _PyCode_New(&con);
failed:
Py_XDECREF(nulltuple);
Py_XDECREF(funcname_ob);
Py_XDECREF(filename_ob);
Py_XDECREF(code_ob);
Py_XDECREF(linetable_ob);
return result;
}
/******************
* source location tracking (co_lines/co_positions)
******************/
int
PyCode_Addr2Line(PyCodeObject *co, int addrq)
{
if (addrq < 0) {
return co->co_firstlineno;
}
assert(addrq >= 0 && addrq < _PyCode_NBYTES(co));
PyCodeAddressRange bounds;
_PyCode_InitAddressRange(co, &bounds);
return _PyCode_CheckLineNumber(addrq, &bounds);
}
void
_PyLineTable_InitAddressRange(const char *linetable, Py_ssize_t length, int firstlineno, PyCodeAddressRange *range)
{
range->opaque.lo_next = (const uint8_t *)linetable;
range->opaque.limit = range->opaque.lo_next + length;
range->ar_start = -1;
range->ar_end = 0;
range->opaque.computed_line = firstlineno;
range->ar_line = -1;
}
int
_PyCode_InitAddressRange(PyCodeObject* co, PyCodeAddressRange *bounds)
{
assert(co->co_linetable != NULL);
const char *linetable = PyBytes_AS_STRING(co->co_linetable);
Py_ssize_t length = PyBytes_GET_SIZE(co->co_linetable);
_PyLineTable_InitAddressRange(linetable, length, co->co_firstlineno, bounds);
return bounds->ar_line;
}
/* Update *bounds to describe the first and one-past-the-last instructions in
the same line as lasti. Return the number of that line, or -1 if lasti is out of bounds. */
int
_PyCode_CheckLineNumber(int lasti, PyCodeAddressRange *bounds)
{
while (bounds->ar_end <= lasti) {
if (!_PyLineTable_NextAddressRange(bounds)) {
return -1;
}
}
while (bounds->ar_start > lasti) {
if (!_PyLineTable_PreviousAddressRange(bounds)) {
return -1;
}
}
return bounds->ar_line;
}
static int
is_no_line_marker(uint8_t b)
{
return (b >> 3) == 0x1f;
}
#define ASSERT_VALID_BOUNDS(bounds) \
assert(bounds->opaque.lo_next <= bounds->opaque.limit && \
(bounds->ar_line == -1 || bounds->ar_line == bounds->opaque.computed_line) && \
(bounds->opaque.lo_next == bounds->opaque.limit || \
(*bounds->opaque.lo_next) & 128))
static int
next_code_delta(PyCodeAddressRange *bounds)
{
assert((*bounds->opaque.lo_next) & 128);
return (((*bounds->opaque.lo_next) & 7) + 1) * sizeof(_Py_CODEUNIT);
}
static int
previous_code_delta(PyCodeAddressRange *bounds)
{
if (bounds->ar_start == 0) {
// If we looking at the first entry, the
// "previous" entry has an implicit length of 1.
return 1;
}
const uint8_t *ptr = bounds->opaque.lo_next-1;
while (((*ptr) & 128) == 0) {
ptr--;
}
return (((*ptr) & 7) + 1) * sizeof(_Py_CODEUNIT);
}
static int
read_byte(PyCodeAddressRange *bounds)
{
return *bounds->opaque.lo_next++;
}
static int
read_varint(PyCodeAddressRange *bounds)
{
unsigned int read = read_byte(bounds);
unsigned int val = read & 63;
unsigned int shift = 0;
while (read & 64) {
read = read_byte(bounds);
shift += 6;
val |= (read & 63) << shift;
}
return val;
}
static int
read_signed_varint(PyCodeAddressRange *bounds)
{
unsigned int uval = read_varint(bounds);
if (uval & 1) {
return -(int)(uval >> 1);
}
else {
return uval >> 1;
}
}
static void
retreat(PyCodeAddressRange *bounds)
{
ASSERT_VALID_BOUNDS(bounds);
assert(bounds->ar_start >= 0);
do {
bounds->opaque.lo_next--;
} while (((*bounds->opaque.lo_next) & 128) == 0);
bounds->opaque.computed_line -= get_line_delta(bounds->opaque.lo_next);
bounds->ar_end = bounds->ar_start;
bounds->ar_start -= previous_code_delta(bounds);
if (is_no_line_marker(bounds->opaque.lo_next[-1])) {
bounds->ar_line = -1;
}
else {
bounds->ar_line = bounds->opaque.computed_line;
}
ASSERT_VALID_BOUNDS(bounds);
}
static void
advance(PyCodeAddressRange *bounds)
{
ASSERT_VALID_BOUNDS(bounds);
bounds->opaque.computed_line += get_line_delta(bounds->opaque.lo_next);
if (is_no_line_marker(*bounds->opaque.lo_next)) {
bounds->ar_line = -1;
}
else {
bounds->ar_line = bounds->opaque.computed_line;
}
bounds->ar_start = bounds->ar_end;
bounds->ar_end += next_code_delta(bounds);
do {
bounds->opaque.lo_next++;
} while (bounds->opaque.lo_next < bounds->opaque.limit &&
((*bounds->opaque.lo_next) & 128) == 0);
ASSERT_VALID_BOUNDS(bounds);
}
static void
advance_with_locations(PyCodeAddressRange *bounds, int *endline, int *column, int *endcolumn)
{
ASSERT_VALID_BOUNDS(bounds);
int first_byte = read_byte(bounds);
int code = (first_byte >> 3) & 15;
bounds->ar_start = bounds->ar_end;
bounds->ar_end = bounds->ar_start + ((first_byte & 7) + 1) * sizeof(_Py_CODEUNIT);
switch(code) {
case PY_CODE_LOCATION_INFO_NONE:
bounds->ar_line = *endline = -1;
*column = *endcolumn = -1;
break;
case PY_CODE_LOCATION_INFO_LONG:
{
bounds->opaque.computed_line += read_signed_varint(bounds);
bounds->ar_line = bounds->opaque.computed_line;
*endline = bounds->ar_line + read_varint(bounds);
*column = read_varint(bounds)-1;
*endcolumn = read_varint(bounds)-1;
break;
}
case PY_CODE_LOCATION_INFO_NO_COLUMNS:
{
/* No column */
bounds->opaque.computed_line += read_signed_varint(bounds);
*endline = bounds->ar_line = bounds->opaque.computed_line;
*column = *endcolumn = -1;
break;
}
case PY_CODE_LOCATION_INFO_ONE_LINE0:
case PY_CODE_LOCATION_INFO_ONE_LINE1:
case PY_CODE_LOCATION_INFO_ONE_LINE2:
{
/* one line form */
int line_delta = code - 10;
bounds->opaque.computed_line += line_delta;
*endline = bounds->ar_line = bounds->opaque.computed_line;
*column = read_byte(bounds);
*endcolumn = read_byte(bounds);
break;
}
default:
{
/* Short forms */
int second_byte = read_byte(bounds);
assert((second_byte & 128) == 0);
*endline = bounds->ar_line = bounds->opaque.computed_line;
*column = code << 3 | (second_byte >> 4);
*endcolumn = *column + (second_byte & 15);
}
}
ASSERT_VALID_BOUNDS(bounds);
}
int
PyCode_Addr2Location(PyCodeObject *co, int addrq,
int *start_line, int *start_column,
int *end_line, int *end_column)
{
if (addrq < 0) {
*start_line = *end_line = co->co_firstlineno;
*start_column = *end_column = 0;
return 1;
}
assert(addrq >= 0 && addrq < _PyCode_NBYTES(co));
PyCodeAddressRange bounds;
_PyCode_InitAddressRange(co, &bounds);
_PyCode_CheckLineNumber(addrq, &bounds);
retreat(&bounds);
advance_with_locations(&bounds, end_line, start_column, end_column);
*start_line = bounds.ar_line;
return 1;
}
static inline int
at_end(PyCodeAddressRange *bounds) {
return bounds->opaque.lo_next >= bounds->opaque.limit;
}
int
_PyLineTable_PreviousAddressRange(PyCodeAddressRange *range)
{
if (range->ar_start <= 0) {
return 0;
}
retreat(range);
assert(range->ar_end > range->ar_start);
return 1;
}
int
_PyLineTable_NextAddressRange(PyCodeAddressRange *range)
{
if (at_end(range)) {
return 0;
}
advance(range);
assert(range->ar_end > range->ar_start);
return 1;
}
static int
emit_pair(PyObject **bytes, int *offset, int a, int b)
{
Py_ssize_t len = PyBytes_GET_SIZE(*bytes);
if (*offset + 2 >= len) {
if (_PyBytes_Resize(bytes, len * 2) < 0)
return 0;
}
unsigned char *lnotab = (unsigned char *) PyBytes_AS_STRING(*bytes);
lnotab += *offset;
*lnotab++ = a;
*lnotab++ = b;
*offset += 2;
return 1;
}
static int
emit_delta(PyObject **bytes, int bdelta, int ldelta, int *offset)
{
while (bdelta > 255) {
if (!emit_pair(bytes, offset, 255, 0)) {
return 0;
}
bdelta -= 255;
}
while (ldelta > 127) {
if (!emit_pair(bytes, offset, bdelta, 127)) {
return 0;
}
bdelta = 0;
ldelta -= 127;
}
while (ldelta < -128) {
if (!emit_pair(bytes, offset, bdelta, -128)) {
return 0;
}
bdelta = 0;
ldelta += 128;
}
return emit_pair(bytes, offset, bdelta, ldelta);
}
static PyObject *
decode_linetable(PyCodeObject *code)
{
PyCodeAddressRange bounds;
PyObject *bytes;
int table_offset = 0;
int code_offset = 0;
int line = code->co_firstlineno;
bytes = PyBytes_FromStringAndSize(NULL, 64);
if (bytes == NULL) {
return NULL;
}
_PyCode_InitAddressRange(code, &bounds);
while (_PyLineTable_NextAddressRange(&bounds)) {
if (bounds.opaque.computed_line != line) {
int bdelta = bounds.ar_start - code_offset;
int ldelta = bounds.opaque.computed_line - line;
if (!emit_delta(&bytes, bdelta, ldelta, &table_offset)) {
Py_DECREF(bytes);
return NULL;
}
code_offset = bounds.ar_start;
line = bounds.opaque.computed_line;
}
}
_PyBytes_Resize(&bytes, table_offset);
return bytes;
}
typedef struct {
PyObject_HEAD
PyCodeObject *li_code;
PyCodeAddressRange li_line;
} lineiterator;
static void
lineiter_dealloc(PyObject *self)
{
lineiterator *li = (lineiterator*)self;
Py_DECREF(li->li_code);
Py_TYPE(li)->tp_free(li);
}
static PyObject *
_source_offset_converter(int *value) {
if (*value == -1) {
Py_RETURN_NONE;
}
return PyLong_FromLong(*value);
}
static PyObject *
lineiter_next(PyObject *self)
{
lineiterator *li = (lineiterator*)self;
PyCodeAddressRange *bounds = &li->li_line;
if (!_PyLineTable_NextAddressRange(bounds)) {
return NULL;
}
int start = bounds->ar_start;
int line = bounds->ar_line;
// Merge overlapping entries:
while (_PyLineTable_NextAddressRange(bounds)) {
if (bounds->ar_line != line) {
_PyLineTable_PreviousAddressRange(bounds);
break;
}
}
return Py_BuildValue("iiO&", start, bounds->ar_end,
_source_offset_converter, &line);
}
PyTypeObject _PyLineIterator = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"line_iterator", /* tp_name */
sizeof(lineiterator), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
lineiter_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
PyObject_SelfIter, /* tp_iter */
lineiter_next, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
PyObject_Free, /* tp_free */
};
static lineiterator *
new_linesiterator(PyCodeObject *code)
{
lineiterator *li = (lineiterator *)PyType_GenericAlloc(&_PyLineIterator, 0);
if (li == NULL) {
return NULL;
}
li->li_code = (PyCodeObject*)Py_NewRef(code);
_PyCode_InitAddressRange(code, &li->li_line);
return li;
}
/* co_positions iterator object. */
typedef struct {
PyObject_HEAD
PyCodeObject* pi_code;
PyCodeAddressRange pi_range;
int pi_offset;
int pi_endline;
int pi_column;
int pi_endcolumn;
} positionsiterator;
static void
positionsiter_dealloc(PyObject *self)
{
positionsiterator *pi = (positionsiterator*)self;
Py_DECREF(pi->pi_code);
Py_TYPE(pi)->tp_free(pi);
}
static PyObject*
positionsiter_next(PyObject *self)
{
positionsiterator *pi = (positionsiterator*)self;
if (pi->pi_offset >= pi->pi_range.ar_end) {
assert(pi->pi_offset == pi->pi_range.ar_end);
if (at_end(&pi->pi_range)) {
return NULL;
}
advance_with_locations(&pi->pi_range, &pi->pi_endline, &pi->pi_column, &pi->pi_endcolumn);
}
pi->pi_offset += 2;
return Py_BuildValue("(O&O&O&O&)",
_source_offset_converter, &pi->pi_range.ar_line,
_source_offset_converter, &pi->pi_endline,
_source_offset_converter, &pi->pi_column,
_source_offset_converter, &pi->pi_endcolumn);
}
PyTypeObject _PyPositionsIterator = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"positions_iterator", /* tp_name */
sizeof(positionsiterator), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
positionsiter_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
PyObject_SelfIter, /* tp_iter */
positionsiter_next, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
PyObject_Free, /* tp_free */
};
static PyObject*
code_positionsiterator(PyObject *self, PyObject* Py_UNUSED(args))
{
PyCodeObject *code = (PyCodeObject*)self;
positionsiterator* pi = (positionsiterator*)PyType_GenericAlloc(&_PyPositionsIterator, 0);
if (pi == NULL) {
return NULL;
}
pi->pi_code = (PyCodeObject*)Py_NewRef(code);
_PyCode_InitAddressRange(code, &pi->pi_range);
pi->pi_offset = pi->pi_range.ar_end;
return (PyObject*)pi;
}
/******************
* "extra" frame eval info (see PEP 523)
******************/
/* Holder for co_extra information */
typedef struct {
Py_ssize_t ce_size;
void *ce_extras[1];
} _PyCodeObjectExtra;
int
PyUnstable_Code_GetExtra(PyObject *code, Py_ssize_t index, void **extra)
{
if (!PyCode_Check(code)) {
PyErr_BadInternalCall();
return -1;
}
PyCodeObject *o = (PyCodeObject*) code;
_PyCodeObjectExtra *co_extra = (_PyCodeObjectExtra*) o->co_extra;
if (co_extra == NULL || index < 0 || co_extra->ce_size <= index) {
*extra = NULL;
return 0;
}
*extra = co_extra->ce_extras[index];
return 0;
}
int
PyUnstable_Code_SetExtra(PyObject *code, Py_ssize_t index, void *extra)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
if (!PyCode_Check(code) || index < 0 ||
index >= interp->co_extra_user_count) {
PyErr_BadInternalCall();
return -1;
}
PyCodeObject *o = (PyCodeObject*) code;
_PyCodeObjectExtra *co_extra = (_PyCodeObjectExtra *) o->co_extra;
if (co_extra == NULL || co_extra->ce_size <= index) {
Py_ssize_t i = (co_extra == NULL ? 0 : co_extra->ce_size);
co_extra = PyMem_Realloc(
co_extra,
sizeof(_PyCodeObjectExtra) +
(interp->co_extra_user_count-1) * sizeof(void*));
if (co_extra == NULL) {
return -1;
}
for (; i < interp->co_extra_user_count; i++) {
co_extra->ce_extras[i] = NULL;
}
co_extra->ce_size = interp->co_extra_user_count;
o->co_extra = co_extra;
}
if (co_extra->ce_extras[index] != NULL) {
freefunc free = interp->co_extra_freefuncs[index];
if (free != NULL) {
free(co_extra->ce_extras[index]);
}
}
co_extra->ce_extras[index] = extra;
return 0;
}
/******************
* other PyCodeObject accessor functions
******************/
static PyObject *
get_cached_locals(PyCodeObject *co, PyObject **cached_field,
_PyLocals_Kind kind, int num)
{
assert(cached_field != NULL);
assert(co->_co_cached != NULL);
PyObject *varnames = FT_ATOMIC_LOAD_PTR(*cached_field);
if (varnames != NULL) {
return Py_NewRef(varnames);
}
Py_BEGIN_CRITICAL_SECTION(co);
varnames = *cached_field;
if (varnames == NULL) {
varnames = get_localsplus_names(co, kind, num);
if (varnames != NULL) {
FT_ATOMIC_STORE_PTR(*cached_field, varnames);
}
}
Py_END_CRITICAL_SECTION();
return Py_XNewRef(varnames);
}
PyObject *
_PyCode_GetVarnames(PyCodeObject *co)
{
if (init_co_cached(co)) {
return NULL;
}
return get_cached_locals(co, &co->_co_cached->_co_varnames, CO_FAST_LOCAL, co->co_nlocals);
}
PyObject *
PyCode_GetVarnames(PyCodeObject *code)
{
return _PyCode_GetVarnames(code);
}
PyObject *
_PyCode_GetCellvars(PyCodeObject *co)
{
if (init_co_cached(co)) {
return NULL;
}
return get_cached_locals(co, &co->_co_cached->_co_cellvars, CO_FAST_CELL, co->co_ncellvars);
}
PyObject *
PyCode_GetCellvars(PyCodeObject *code)
{
return _PyCode_GetCellvars(code);
}
PyObject *
_PyCode_GetFreevars(PyCodeObject *co)
{
if (init_co_cached(co)) {
return NULL;
}
return get_cached_locals(co, &co->_co_cached->_co_freevars, CO_FAST_FREE, co->co_nfreevars);
}
PyObject *
PyCode_GetFreevars(PyCodeObject *code)
{
return _PyCode_GetFreevars(code);
}
#ifdef _Py_TIER2
static void
clear_executors(PyCodeObject *co)
{
assert(co->co_executors);
for (int i = 0; i < co->co_executors->size; i++) {
if (co->co_executors->executors[i]) {
_Py_ExecutorDetach(co->co_executors->executors[i]);
assert(co->co_executors->executors[i] == NULL);
}
}
PyMem_Free(co->co_executors);
co->co_executors = NULL;
}
void
_PyCode_Clear_Executors(PyCodeObject *code)
{
clear_executors(code);
}
#endif
static void
deopt_code(PyCodeObject *code, _Py_CODEUNIT *instructions)
{
Py_ssize_t len = Py_SIZE(code);
for (int i = 0; i < len; i++) {
_Py_CODEUNIT inst = _Py_GetBaseCodeUnit(code, i);
assert(inst.op.code < MIN_SPECIALIZED_OPCODE);
int caches = _PyOpcode_Caches[inst.op.code];
instructions[i] = inst;
for (int j = 1; j <= caches; j++) {
instructions[i+j].cache = 0;
}
i += caches;
}
}
PyObject *
_PyCode_GetCode(PyCodeObject *co)
{
if (init_co_cached(co)) {
return NULL;
}
_PyCoCached *cached = co->_co_cached;
PyObject *code = FT_ATOMIC_LOAD_PTR(cached->_co_code);
if (code != NULL) {
return Py_NewRef(code);
}
Py_BEGIN_CRITICAL_SECTION(co);
code = cached->_co_code;
if (code == NULL) {
code = PyBytes_FromStringAndSize((const char *)_PyCode_CODE(co),
_PyCode_NBYTES(co));
if (code != NULL) {
deopt_code(co, (_Py_CODEUNIT *)PyBytes_AS_STRING(code));
assert(cached->_co_code == NULL);
FT_ATOMIC_STORE_PTR(cached->_co_code, code);
}
}
Py_END_CRITICAL_SECTION();
return Py_XNewRef(code);
}
PyObject *
PyCode_GetCode(PyCodeObject *co)
{
return _PyCode_GetCode(co);
}
/******************
* PyCode_Type
******************/
/*[clinic input]
class code "PyCodeObject *" "&PyCode_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=78aa5d576683bb4b]*/
/*[clinic input]
@classmethod
code.__new__ as code_new
argcount: int
posonlyargcount: int
kwonlyargcount: int
nlocals: int
stacksize: int
flags: int
codestring as code: object(subclass_of="&PyBytes_Type")
constants as consts: object(subclass_of="&PyTuple_Type")
names: object(subclass_of="&PyTuple_Type")
varnames: object(subclass_of="&PyTuple_Type")
filename: unicode
name: unicode
qualname: unicode
firstlineno: int
linetable: object(subclass_of="&PyBytes_Type")
exceptiontable: object(subclass_of="&PyBytes_Type")
freevars: object(subclass_of="&PyTuple_Type", c_default="NULL") = ()
cellvars: object(subclass_of="&PyTuple_Type", c_default="NULL") = ()
/
Create a code object. Not for the faint of heart.
[clinic start generated code]*/
static PyObject *
code_new_impl(PyTypeObject *type, int argcount, int posonlyargcount,
int kwonlyargcount, int nlocals, int stacksize, int flags,
PyObject *code, PyObject *consts, PyObject *names,
PyObject *varnames, PyObject *filename, PyObject *name,
PyObject *qualname, int firstlineno, PyObject *linetable,
PyObject *exceptiontable, PyObject *freevars,
PyObject *cellvars)
/*[clinic end generated code: output=069fa20d299f9dda input=e31da3c41ad8064a]*/
{
PyObject *co = NULL;
PyObject *ournames = NULL;
PyObject *ourvarnames = NULL;
PyObject *ourfreevars = NULL;
PyObject *ourcellvars = NULL;
if (PySys_Audit("code.__new__", "OOOiiiiii",
code, filename, name, argcount, posonlyargcount,
kwonlyargcount, nlocals, stacksize, flags) < 0) {
goto cleanup;
}
if (argcount < 0) {
PyErr_SetString(
PyExc_ValueError,
"code: argcount must not be negative");
goto cleanup;
}
if (posonlyargcount < 0) {
PyErr_SetString(
PyExc_ValueError,
"code: posonlyargcount must not be negative");
goto cleanup;
}
if (kwonlyargcount < 0) {
PyErr_SetString(
PyExc_ValueError,
"code: kwonlyargcount must not be negative");
goto cleanup;
}
if (nlocals < 0) {
PyErr_SetString(
PyExc_ValueError,
"code: nlocals must not be negative");
goto cleanup;
}
ournames = validate_and_copy_tuple(names);
if (ournames == NULL)
goto cleanup;
ourvarnames = validate_and_copy_tuple(varnames);
if (ourvarnames == NULL)
goto cleanup;
if (freevars)
ourfreevars = validate_and_copy_tuple(freevars);
else
ourfreevars = PyTuple_New(0);
if (ourfreevars == NULL)
goto cleanup;
if (cellvars)
ourcellvars = validate_and_copy_tuple(cellvars);
else
ourcellvars = PyTuple_New(0);
if (ourcellvars == NULL)
goto cleanup;
co = (PyObject *)PyCode_NewWithPosOnlyArgs(argcount, posonlyargcount,
kwonlyargcount,
nlocals, stacksize, flags,
code, consts, ournames,
ourvarnames, ourfreevars,
ourcellvars, filename,
name, qualname, firstlineno,
linetable,
exceptiontable
);
cleanup:
Py_XDECREF(ournames);
Py_XDECREF(ourvarnames);
Py_XDECREF(ourfreevars);
Py_XDECREF(ourcellvars);
return co;
}
static void
free_monitoring_data(_PyCoMonitoringData *data)
{
if (data == NULL) {
return;
}
if (data->tools) {
PyMem_Free(data->tools);
}
if (data->lines) {
PyMem_Free(data->lines);
}
if (data->line_tools) {
PyMem_Free(data->line_tools);
}
if (data->per_instruction_opcodes) {
PyMem_Free(data->per_instruction_opcodes);
}
if (data->per_instruction_tools) {
PyMem_Free(data->per_instruction_tools);
}
PyMem_Free(data);
}
static void
code_dealloc(PyCodeObject *co)
{
assert(Py_REFCNT(co) == 0);
Py_SET_REFCNT(co, 1);
notify_code_watchers(PY_CODE_EVENT_DESTROY, co);
if (Py_REFCNT(co) > 1) {
Py_SET_REFCNT(co, Py_REFCNT(co) - 1);
return;
}
Py_SET_REFCNT(co, 0);
#ifdef Py_GIL_DISABLED
PyObject_GC_UnTrack(co);
#endif
_PyFunction_ClearCodeByVersion(co->co_version);
if (co->co_extra != NULL) {
PyInterpreterState *interp = _PyInterpreterState_GET();
_PyCodeObjectExtra *co_extra = co->co_extra;
for (Py_ssize_t i = 0; i < co_extra->ce_size; i++) {
freefunc free_extra = interp->co_extra_freefuncs[i];
if (free_extra != NULL) {
free_extra(co_extra->ce_extras[i]);
}
}
PyMem_Free(co_extra);
}
#ifdef _Py_TIER2
if (co->co_executors != NULL) {
clear_executors(co);
}
#endif
Py_XDECREF(co->co_consts);
Py_XDECREF(co->co_names);
Py_XDECREF(co->co_localsplusnames);
Py_XDECREF(co->co_localspluskinds);
Py_XDECREF(co->co_filename);
Py_XDECREF(co->co_name);
Py_XDECREF(co->co_qualname);
Py_XDECREF(co->co_linetable);
Py_XDECREF(co->co_exceptiontable);
#ifdef Py_GIL_DISABLED
assert(co->_co_unique_id == -1);
#endif
if (co->_co_cached != NULL) {
Py_XDECREF(co->_co_cached->_co_code);
Py_XDECREF(co->_co_cached->_co_cellvars);
Py_XDECREF(co->_co_cached->_co_freevars);
Py_XDECREF(co->_co_cached->_co_varnames);
PyMem_Free(co->_co_cached);
}
if (co->co_weakreflist != NULL) {
PyObject_ClearWeakRefs((PyObject*)co);
}
free_monitoring_data(co->_co_monitoring);
#ifdef Py_GIL_DISABLED
// The first element always points to the mutable bytecode at the end of
// the code object, which will be freed when the code object is freed.
for (Py_ssize_t i = 1; i < co->co_tlbc->size; i++) {
char *entry = co->co_tlbc->entries[i];
if (entry != NULL) {
PyMem_Free(entry);
}
}
PyMem_Free(co->co_tlbc);
#endif
PyObject_Free(co);
}
#ifdef Py_GIL_DISABLED
static int
code_traverse(PyObject *self, visitproc visit, void *arg)
{
PyCodeObject *co = (PyCodeObject*)self;
Py_VISIT(co->co_consts);
return 0;
}
#endif
static PyObject *
code_repr(PyObject *self)
{
PyCodeObject *co = (PyCodeObject*)self;
int lineno;
if (co->co_firstlineno != 0)
lineno = co->co_firstlineno;
else
lineno = -1;
if (co->co_filename && PyUnicode_Check(co->co_filename)) {
return PyUnicode_FromFormat(
"<code object %U at %p, file \"%U\", line %d>",
co->co_name, co, co->co_filename, lineno);
} else {
return PyUnicode_FromFormat(
"<code object %U at %p, file ???, line %d>",
co->co_name, co, lineno);
}
}
static PyObject *
code_richcompare(PyObject *self, PyObject *other, int op)
{
PyCodeObject *co, *cp;
int eq;
PyObject *consts1, *consts2;
PyObject *res;
if ((op != Py_EQ && op != Py_NE) ||
!PyCode_Check(self) ||
!PyCode_Check(other)) {
Py_RETURN_NOTIMPLEMENTED;
}
co = (PyCodeObject *)self;
cp = (PyCodeObject *)other;
eq = PyObject_RichCompareBool(co->co_name, cp->co_name, Py_EQ);
if (!eq) goto unequal;
eq = co->co_argcount == cp->co_argcount;
if (!eq) goto unequal;
eq = co->co_posonlyargcount == cp->co_posonlyargcount;
if (!eq) goto unequal;
eq = co->co_kwonlyargcount == cp->co_kwonlyargcount;
if (!eq) goto unequal;
eq = co->co_flags == cp->co_flags;
if (!eq) goto unequal;
eq = co->co_firstlineno == cp->co_firstlineno;
if (!eq) goto unequal;
eq = Py_SIZE(co) == Py_SIZE(cp);
if (!eq) {
goto unequal;
}
for (int i = 0; i < Py_SIZE(co); i++) {
_Py_CODEUNIT co_instr = _Py_GetBaseCodeUnit(co, i);
_Py_CODEUNIT cp_instr = _Py_GetBaseCodeUnit(cp, i);
if (co_instr.cache != cp_instr.cache) {
goto unequal;
}
i += _PyOpcode_Caches[co_instr.op.code];
}
/* compare constants */
consts1 = _PyCode_ConstantKey(co->co_consts);
if (!consts1)
return NULL;
consts2 = _PyCode_ConstantKey(cp->co_consts);
if (!consts2) {
Py_DECREF(consts1);
return NULL;
}
eq = PyObject_RichCompareBool(consts1, consts2, Py_EQ);
Py_DECREF(consts1);
Py_DECREF(consts2);
if (eq <= 0) goto unequal;
eq = PyObject_RichCompareBool(co->co_names, cp->co_names, Py_EQ);
if (eq <= 0) goto unequal;
eq = PyObject_RichCompareBool(co->co_localsplusnames,
cp->co_localsplusnames, Py_EQ);
if (eq <= 0) goto unequal;
eq = PyObject_RichCompareBool(co->co_linetable, cp->co_linetable, Py_EQ);
if (eq <= 0) {
goto unequal;
}
eq = PyObject_RichCompareBool(co->co_exceptiontable,
cp->co_exceptiontable, Py_EQ);
if (eq <= 0) {
goto unequal;
}
if (op == Py_EQ)
res = Py_True;
else
res = Py_False;
goto done;
unequal:
if (eq < 0)
return NULL;
if (op == Py_NE)
res = Py_True;
else
res = Py_False;
done:
return Py_NewRef(res);
}
static Py_hash_t
code_hash(PyObject *self)
{
PyCodeObject *co = (PyCodeObject*)self;
Py_uhash_t uhash = 20221211;
#define SCRAMBLE_IN(H) do { \
uhash ^= (Py_uhash_t)(H); \
uhash *= PyHASH_MULTIPLIER; \
} while (0)
#define SCRAMBLE_IN_HASH(EXPR) do { \
Py_hash_t h = PyObject_Hash(EXPR); \
if (h == -1) { \
return -1; \
} \
SCRAMBLE_IN(h); \
} while (0)
SCRAMBLE_IN_HASH(co->co_name);
SCRAMBLE_IN_HASH(co->co_consts);
SCRAMBLE_IN_HASH(co->co_names);
SCRAMBLE_IN_HASH(co->co_localsplusnames);
SCRAMBLE_IN_HASH(co->co_linetable);
SCRAMBLE_IN_HASH(co->co_exceptiontable);
SCRAMBLE_IN(co->co_argcount);
SCRAMBLE_IN(co->co_posonlyargcount);
SCRAMBLE_IN(co->co_kwonlyargcount);
SCRAMBLE_IN(co->co_flags);
SCRAMBLE_IN(co->co_firstlineno);
SCRAMBLE_IN(Py_SIZE(co));
for (int i = 0; i < Py_SIZE(co); i++) {
_Py_CODEUNIT co_instr = _Py_GetBaseCodeUnit(co, i);
SCRAMBLE_IN(co_instr.op.code);
SCRAMBLE_IN(co_instr.op.arg);
i += _PyOpcode_Caches[co_instr.op.code];
}
if ((Py_hash_t)uhash == -1) {
return -2;
}
return (Py_hash_t)uhash;
}
#define OFF(x) offsetof(PyCodeObject, x)
static PyMemberDef code_memberlist[] = {
{"co_argcount", Py_T_INT, OFF(co_argcount), Py_READONLY},
{"co_posonlyargcount", Py_T_INT, OFF(co_posonlyargcount), Py_READONLY},
{"co_kwonlyargcount", Py_T_INT, OFF(co_kwonlyargcount), Py_READONLY},
{"co_stacksize", Py_T_INT, OFF(co_stacksize), Py_READONLY},
{"co_flags", Py_T_INT, OFF(co_flags), Py_READONLY},
{"co_nlocals", Py_T_INT, OFF(co_nlocals), Py_READONLY},
{"co_consts", _Py_T_OBJECT, OFF(co_consts), Py_READONLY},
{"co_names", _Py_T_OBJECT, OFF(co_names), Py_READONLY},
{"co_filename", _Py_T_OBJECT, OFF(co_filename), Py_READONLY},
{"co_name", _Py_T_OBJECT, OFF(co_name), Py_READONLY},
{"co_qualname", _Py_T_OBJECT, OFF(co_qualname), Py_READONLY},
{"co_firstlineno", Py_T_INT, OFF(co_firstlineno), Py_READONLY},
{"co_linetable", _Py_T_OBJECT, OFF(co_linetable), Py_READONLY},
{"co_exceptiontable", _Py_T_OBJECT, OFF(co_exceptiontable), Py_READONLY},
{NULL} /* Sentinel */
};
static PyObject *
code_getlnotab(PyObject *self, void *closure)
{
PyCodeObject *code = (PyCodeObject*)self;
if (PyErr_WarnEx(PyExc_DeprecationWarning,
"co_lnotab is deprecated, use co_lines instead.",
1) < 0) {
return NULL;
}
return decode_linetable(code);
}
static PyObject *
code_getvarnames(PyObject *self, void *closure)
{
PyCodeObject *code = (PyCodeObject*)self;
return _PyCode_GetVarnames(code);
}
static PyObject *
code_getcellvars(PyObject *self, void *closure)
{
PyCodeObject *code = (PyCodeObject*)self;
return _PyCode_GetCellvars(code);
}
static PyObject *
code_getfreevars(PyObject *self, void *closure)
{
PyCodeObject *code = (PyCodeObject*)self;
return _PyCode_GetFreevars(code);
}
static PyObject *
code_getcodeadaptive(PyObject *self, void *closure)
{
PyCodeObject *code = (PyCodeObject*)self;
return PyBytes_FromStringAndSize(code->co_code_adaptive,
_PyCode_NBYTES(code));
}
static PyObject *
code_getcode(PyObject *self, void *closure)
{
PyCodeObject *code = (PyCodeObject*)self;
return _PyCode_GetCode(code);
}
static PyGetSetDef code_getsetlist[] = {
{"co_lnotab", code_getlnotab, NULL, NULL},
{"_co_code_adaptive", code_getcodeadaptive, NULL, NULL},
// The following old names are kept for backward compatibility.
{"co_varnames", code_getvarnames, NULL, NULL},
{"co_cellvars", code_getcellvars, NULL, NULL},
{"co_freevars", code_getfreevars, NULL, NULL},
{"co_code", code_getcode, NULL, NULL},
{0}
};
static PyObject *
code_sizeof(PyObject *self, PyObject *Py_UNUSED(args))
{
PyCodeObject *co = (PyCodeObject*)self;
size_t res = _PyObject_VAR_SIZE(Py_TYPE(co), Py_SIZE(co));
_PyCodeObjectExtra *co_extra = (_PyCodeObjectExtra*) co->co_extra;
if (co_extra != NULL) {
res += sizeof(_PyCodeObjectExtra);
res += ((size_t)co_extra->ce_size - 1) * sizeof(co_extra->ce_extras[0]);
}
return PyLong_FromSize_t(res);
}
static PyObject *
code_linesiterator(PyObject *self, PyObject *Py_UNUSED(args))
{
PyCodeObject *code = (PyCodeObject*)self;
return (PyObject *)new_linesiterator(code);
}
/*[clinic input]
@text_signature "($self, /, **changes)"
code.replace
*
co_argcount: int(c_default="self->co_argcount") = unchanged
co_posonlyargcount: int(c_default="self->co_posonlyargcount") = unchanged
co_kwonlyargcount: int(c_default="self->co_kwonlyargcount") = unchanged
co_nlocals: int(c_default="self->co_nlocals") = unchanged
co_stacksize: int(c_default="self->co_stacksize") = unchanged
co_flags: int(c_default="self->co_flags") = unchanged
co_firstlineno: int(c_default="self->co_firstlineno") = unchanged
co_code: object(subclass_of="&PyBytes_Type", c_default="NULL") = unchanged
co_consts: object(subclass_of="&PyTuple_Type", c_default="self->co_consts") = unchanged
co_names: object(subclass_of="&PyTuple_Type", c_default="self->co_names") = unchanged
co_varnames: object(subclass_of="&PyTuple_Type", c_default="NULL") = unchanged
co_freevars: object(subclass_of="&PyTuple_Type", c_default="NULL") = unchanged
co_cellvars: object(subclass_of="&PyTuple_Type", c_default="NULL") = unchanged
co_filename: unicode(c_default="self->co_filename") = unchanged
co_name: unicode(c_default="self->co_name") = unchanged
co_qualname: unicode(c_default="self->co_qualname") = unchanged
co_linetable: object(subclass_of="&PyBytes_Type", c_default="self->co_linetable") = unchanged
co_exceptiontable: object(subclass_of="&PyBytes_Type", c_default="self->co_exceptiontable") = unchanged
Return a copy of the code object with new values for the specified fields.
[clinic start generated code]*/
static PyObject *
code_replace_impl(PyCodeObject *self, int co_argcount,
int co_posonlyargcount, int co_kwonlyargcount,
int co_nlocals, int co_stacksize, int co_flags,
int co_firstlineno, PyObject *co_code, PyObject *co_consts,
PyObject *co_names, PyObject *co_varnames,
PyObject *co_freevars, PyObject *co_cellvars,
PyObject *co_filename, PyObject *co_name,
PyObject *co_qualname, PyObject *co_linetable,
PyObject *co_exceptiontable)
/*[clinic end generated code: output=e75c48a15def18b9 input=18e280e07846c122]*/
{
#define CHECK_INT_ARG(ARG) \
if (ARG < 0) { \
PyErr_SetString(PyExc_ValueError, \
#ARG " must be a positive integer"); \
return NULL; \
}
CHECK_INT_ARG(co_argcount);
CHECK_INT_ARG(co_posonlyargcount);
CHECK_INT_ARG(co_kwonlyargcount);
CHECK_INT_ARG(co_nlocals);
CHECK_INT_ARG(co_stacksize);
CHECK_INT_ARG(co_flags);
CHECK_INT_ARG(co_firstlineno);
#undef CHECK_INT_ARG
PyObject *code = NULL;
if (co_code == NULL) {
code = _PyCode_GetCode(self);
if (code == NULL) {
return NULL;
}
co_code = code;
}
if (PySys_Audit("code.__new__", "OOOiiiiii",
co_code, co_filename, co_name, co_argcount,
co_posonlyargcount, co_kwonlyargcount, co_nlocals,
co_stacksize, co_flags) < 0) {
Py_XDECREF(code);
return NULL;
}
PyCodeObject *co = NULL;
PyObject *varnames = NULL;
PyObject *cellvars = NULL;
PyObject *freevars = NULL;
if (co_varnames == NULL) {
varnames = get_localsplus_names(self, CO_FAST_LOCAL, self->co_nlocals);
if (varnames == NULL) {
goto error;
}
co_varnames = varnames;
}
if (co_cellvars == NULL) {
cellvars = get_localsplus_names(self, CO_FAST_CELL, self->co_ncellvars);
if (cellvars == NULL) {
goto error;
}
co_cellvars = cellvars;
}
if (co_freevars == NULL) {
freevars = get_localsplus_names(self, CO_FAST_FREE, self->co_nfreevars);
if (freevars == NULL) {
goto error;
}
co_freevars = freevars;
}
co = PyCode_NewWithPosOnlyArgs(
co_argcount, co_posonlyargcount, co_kwonlyargcount, co_nlocals,
co_stacksize, co_flags, co_code, co_consts, co_names,
co_varnames, co_freevars, co_cellvars, co_filename, co_name,
co_qualname, co_firstlineno,
co_linetable, co_exceptiontable);
error:
Py_XDECREF(code);
Py_XDECREF(varnames);
Py_XDECREF(cellvars);
Py_XDECREF(freevars);
return (PyObject *)co;
}
/*[clinic input]
code._varname_from_oparg
oparg: int
(internal-only) Return the local variable name for the given oparg.
WARNING: this method is for internal use only and may change or go away.
[clinic start generated code]*/
static PyObject *
code__varname_from_oparg_impl(PyCodeObject *self, int oparg)
/*[clinic end generated code: output=1fd1130413184206 input=c5fa3ee9bac7d4ca]*/
{
PyObject *name = PyTuple_GetItem(self->co_localsplusnames, oparg);
if (name == NULL) {
return NULL;
}
return Py_NewRef(name);
}
/* XXX code objects need to participate in GC? */
static struct PyMethodDef code_methods[] = {
{"__sizeof__", code_sizeof, METH_NOARGS},
{"co_lines", code_linesiterator, METH_NOARGS},
{"co_positions", code_positionsiterator, METH_NOARGS},
CODE_REPLACE_METHODDEF
CODE__VARNAME_FROM_OPARG_METHODDEF
{"__replace__", _PyCFunction_CAST(code_replace), METH_FASTCALL|METH_KEYWORDS,
PyDoc_STR("__replace__($self, /, **changes)\n--\n\nThe same as replace().")},
{NULL, NULL} /* sentinel */
};
PyTypeObject PyCode_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"code",
offsetof(PyCodeObject, co_code_adaptive),
sizeof(_Py_CODEUNIT),
(destructor)code_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
code_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
code_hash, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
#ifdef Py_GIL_DISABLED
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
#else
Py_TPFLAGS_DEFAULT, /* tp_flags */
#endif
code_new__doc__, /* tp_doc */
#ifdef Py_GIL_DISABLED
code_traverse, /* tp_traverse */
#else
0, /* tp_traverse */
#endif
0, /* tp_clear */
code_richcompare, /* tp_richcompare */
offsetof(PyCodeObject, co_weakreflist), /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
code_methods, /* tp_methods */
code_memberlist, /* tp_members */
code_getsetlist, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
code_new, /* tp_new */
};
/******************
* other API
******************/
PyObject*
_PyCode_ConstantKey(PyObject *op)
{
PyObject *key;
/* Py_None and Py_Ellipsis are singletons. */
if (op == Py_None || op == Py_Ellipsis
|| PyLong_CheckExact(op)
|| PyUnicode_CheckExact(op)
/* code_richcompare() uses _PyCode_ConstantKey() internally */
|| PyCode_Check(op))
{
/* Objects of these types are always different from object of other
* type and from tuples. */
key = Py_NewRef(op);
}
else if (PyBool_Check(op) || PyBytes_CheckExact(op)) {
/* Make booleans different from integers 0 and 1.
* Avoid BytesWarning from comparing bytes with strings. */
key = PyTuple_Pack(2, Py_TYPE(op), op);
}
else if (PyFloat_CheckExact(op)) {
double d = PyFloat_AS_DOUBLE(op);
/* all we need is to make the tuple different in either the 0.0
* or -0.0 case from all others, just to avoid the "coercion".
*/
if (d == 0.0 && copysign(1.0, d) < 0.0)
key = PyTuple_Pack(3, Py_TYPE(op), op, Py_None);
else
key = PyTuple_Pack(2, Py_TYPE(op), op);
}
else if (PyComplex_CheckExact(op)) {
Py_complex z;
int real_negzero, imag_negzero;
/* For the complex case we must make complex(x, 0.)
different from complex(x, -0.) and complex(0., y)
different from complex(-0., y), for any x and y.
All four complex zeros must be distinguished.*/
z = PyComplex_AsCComplex(op);
real_negzero = z.real == 0.0 && copysign(1.0, z.real) < 0.0;
imag_negzero = z.imag == 0.0 && copysign(1.0, z.imag) < 0.0;
/* use True, False and None singleton as tags for the real and imag
* sign, to make tuples different */
if (real_negzero && imag_negzero) {
key = PyTuple_Pack(3, Py_TYPE(op), op, Py_True);
}
else if (imag_negzero) {
key = PyTuple_Pack(3, Py_TYPE(op), op, Py_False);
}
else if (real_negzero) {
key = PyTuple_Pack(3, Py_TYPE(op), op, Py_None);
}
else {
key = PyTuple_Pack(2, Py_TYPE(op), op);
}
}
else if (PyTuple_CheckExact(op)) {
Py_ssize_t i, len;
PyObject *tuple;
len = PyTuple_GET_SIZE(op);
tuple = PyTuple_New(len);
if (tuple == NULL)
return NULL;
for (i=0; i < len; i++) {
PyObject *item, *item_key;
item = PyTuple_GET_ITEM(op, i);
item_key = _PyCode_ConstantKey(item);
if (item_key == NULL) {
Py_DECREF(tuple);
return NULL;
}
PyTuple_SET_ITEM(tuple, i, item_key);
}
key = PyTuple_Pack(2, tuple, op);
Py_DECREF(tuple);
}
else if (PyFrozenSet_CheckExact(op)) {
Py_ssize_t pos = 0;
PyObject *item;
Py_hash_t hash;
Py_ssize_t i, len;
PyObject *tuple, *set;
len = PySet_GET_SIZE(op);
tuple = PyTuple_New(len);
if (tuple == NULL)
return NULL;
i = 0;
while (_PySet_NextEntry(op, &pos, &item, &hash)) {
PyObject *item_key;
item_key = _PyCode_ConstantKey(item);
if (item_key == NULL) {
Py_DECREF(tuple);
return NULL;
}
assert(i < len);
PyTuple_SET_ITEM(tuple, i, item_key);
i++;
}
set = PyFrozenSet_New(tuple);
Py_DECREF(tuple);
if (set == NULL)
return NULL;
key = PyTuple_Pack(2, set, op);
Py_DECREF(set);
return key;
}
else if (PySlice_Check(op)) {
PySliceObject *slice = (PySliceObject *)op;
PyObject *start_key = NULL;
PyObject *stop_key = NULL;
PyObject *step_key = NULL;
key = NULL;
start_key = _PyCode_ConstantKey(slice->start);
if (start_key == NULL) {
goto slice_exit;
}
stop_key = _PyCode_ConstantKey(slice->stop);
if (stop_key == NULL) {
goto slice_exit;
}
step_key = _PyCode_ConstantKey(slice->step);
if (step_key == NULL) {
goto slice_exit;
}
PyObject *slice_key = PySlice_New(start_key, stop_key, step_key);
if (slice_key == NULL) {
goto slice_exit;
}
key = PyTuple_Pack(2, slice_key, op);
Py_DECREF(slice_key);
slice_exit:
Py_XDECREF(start_key);
Py_XDECREF(stop_key);
Py_XDECREF(step_key);
}
else {
/* for other types, use the object identifier as a unique identifier
* to ensure that they are seen as unequal. */
PyObject *obj_id = PyLong_FromVoidPtr(op);
if (obj_id == NULL)
return NULL;
key = PyTuple_Pack(2, obj_id, op);
Py_DECREF(obj_id);
}
return key;
}
#ifdef Py_GIL_DISABLED
static PyObject *
intern_one_constant(PyObject *op)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
_Py_hashtable_t *consts = interp->code_state.constants;
assert(!PyUnicode_CheckExact(op)); // strings are interned separately
_Py_hashtable_entry_t *entry = _Py_hashtable_get_entry(consts, op);
if (entry == NULL) {
if (_Py_hashtable_set(consts, op, op) != 0) {
return NULL;
}
#ifdef Py_REF_DEBUG
Py_ssize_t refcnt = Py_REFCNT(op);
if (refcnt != 1) {
// Adjust the reftotal to account for the fact that we only
// restore a single reference in _PyCode_Fini.
_Py_AddRefTotal(_PyThreadState_GET(), -(refcnt - 1));
}
#endif
_Py_SetImmortal(op);
return op;
}
assert(_Py_IsImmortal(entry->value));
return (PyObject *)entry->value;
}
static int
compare_constants(const void *key1, const void *key2) {
PyObject *op1 = (PyObject *)key1;
PyObject *op2 = (PyObject *)key2;
if (op1 == op2) {
return 1;
}
if (Py_TYPE(op1) != Py_TYPE(op2)) {
return 0;
}
// We compare container contents by identity because we have already
// internalized the items.
if (PyTuple_CheckExact(op1)) {
Py_ssize_t size = PyTuple_GET_SIZE(op1);
if (size != PyTuple_GET_SIZE(op2)) {
return 0;
}
for (Py_ssize_t i = 0; i < size; i++) {
if (PyTuple_GET_ITEM(op1, i) != PyTuple_GET_ITEM(op2, i)) {
return 0;
}
}
return 1;
}
else if (PyFrozenSet_CheckExact(op1)) {
if (PySet_GET_SIZE(op1) != PySet_GET_SIZE(op2)) {
return 0;
}
Py_ssize_t pos1 = 0, pos2 = 0;
PyObject *obj1, *obj2;
Py_hash_t hash1, hash2;
while ((_PySet_NextEntry(op1, &pos1, &obj1, &hash1)) &&
(_PySet_NextEntry(op2, &pos2, &obj2, &hash2)))
{
if (obj1 != obj2) {
return 0;
}
}
return 1;
}
else if (PySlice_Check(op1)) {
PySliceObject *s1 = (PySliceObject *)op1;
PySliceObject *s2 = (PySliceObject *)op2;
return (s1->start == s2->start &&
s1->stop == s2->stop &&
s1->step == s2->step);
}
else if (PyBytes_CheckExact(op1) || PyLong_CheckExact(op1)) {
return PyObject_RichCompareBool(op1, op2, Py_EQ);
}
else if (PyFloat_CheckExact(op1)) {
// Ensure that, for example, +0.0 and -0.0 are distinct
double f1 = PyFloat_AS_DOUBLE(op1);
double f2 = PyFloat_AS_DOUBLE(op2);
return memcmp(&f1, &f2, sizeof(double)) == 0;
}
else if (PyComplex_CheckExact(op1)) {
Py_complex c1 = ((PyComplexObject *)op1)->cval;
Py_complex c2 = ((PyComplexObject *)op2)->cval;
return memcmp(&c1, &c2, sizeof(Py_complex)) == 0;
}
_Py_FatalErrorFormat("unexpected type in compare_constants: %s",
Py_TYPE(op1)->tp_name);
return 0;
}
static Py_uhash_t
hash_const(const void *key)
{
PyObject *op = (PyObject *)key;
if (PySlice_Check(op)) {
PySliceObject *s = (PySliceObject *)op;
PyObject *data[3] = { s->start, s->stop, s->step };
return Py_HashBuffer(&data, sizeof(data));
}
else if (PyTuple_CheckExact(op)) {
Py_ssize_t size = PyTuple_GET_SIZE(op);
PyObject **data = _PyTuple_ITEMS(op);
return Py_HashBuffer(data, sizeof(PyObject *) * size);
}
Py_hash_t h = PyObject_Hash(op);
if (h == -1) {
// This should never happen: all the constants we support have
// infallible hash functions.
Py_FatalError("code: hash failed");
}
return (Py_uhash_t)h;
}
static int
clear_containers(_Py_hashtable_t *ht, const void *key, const void *value,
void *user_data)
{
// First clear containers to avoid recursive deallocation later on in
// destroy_key.
PyObject *op = (PyObject *)key;
if (PyTuple_CheckExact(op)) {
for (Py_ssize_t i = 0; i < PyTuple_GET_SIZE(op); i++) {
Py_CLEAR(_PyTuple_ITEMS(op)[i]);
}
}
else if (PySlice_Check(op)) {
PySliceObject *slice = (PySliceObject *)op;
Py_SETREF(slice->start, Py_None);
Py_SETREF(slice->stop, Py_None);
Py_SETREF(slice->step, Py_None);
}
else if (PyFrozenSet_CheckExact(op)) {
_PySet_ClearInternal((PySetObject *)op);
}
return 0;
}
static void
destroy_key(void *key)
{
_Py_ClearImmortal(key);
}
#endif
PyStatus
_PyCode_Init(PyInterpreterState *interp)
{
#ifdef Py_GIL_DISABLED
struct _py_code_state *state = &interp->code_state;
state->constants = _Py_hashtable_new_full(&hash_const, &compare_constants,
&destroy_key, NULL, NULL);
if (state->constants == NULL) {
return _PyStatus_NO_MEMORY();
}
#endif
return _PyStatus_OK();
}
void
_PyCode_Fini(PyInterpreterState *interp)
{
#ifdef Py_GIL_DISABLED
// Free interned constants
struct _py_code_state *state = &interp->code_state;
if (state->constants) {
_Py_hashtable_foreach(state->constants, &clear_containers, NULL);
_Py_hashtable_destroy(state->constants);
state->constants = NULL;
}
_PyIndexPool_Fini(&interp->tlbc_indices);
#endif
}
#ifdef Py_GIL_DISABLED
// Thread-local bytecode (TLBC)
//
// Each thread specializes a thread-local copy of the bytecode, created on the
// first RESUME, in free-threaded builds. All copies of the bytecode for a code
// object are stored in the `co_tlbc` array. Threads reserve a globally unique
// index identifying its copy of the bytecode in all `co_tlbc` arrays at thread
// creation and release the index at thread destruction. The first entry in
// every `co_tlbc` array always points to the "main" copy of the bytecode that
// is stored at the end of the code object. This ensures that no bytecode is
// copied for programs that do not use threads.
//
// Thread-local bytecode can be disabled at runtime by providing either `-X
// tlbc=0` or `PYTHON_TLBC=0`. Disabling thread-local bytecode also disables
// specialization. All threads share the main copy of the bytecode when
// thread-local bytecode is disabled.
//
// Concurrent modifications to the bytecode made by the specializing
// interpreter and instrumentation use atomics, with specialization taking care
// not to overwrite an instruction that was instrumented concurrently.
int32_t
_Py_ReserveTLBCIndex(PyInterpreterState *interp)
{
if (interp->config.tlbc_enabled) {
return _PyIndexPool_AllocIndex(&interp->tlbc_indices);
}
// All threads share the main copy of the bytecode when TLBC is disabled
return 0;
}
void
_Py_ClearTLBCIndex(_PyThreadStateImpl *tstate)
{
PyInterpreterState *interp = ((PyThreadState *)tstate)->interp;
if (interp->config.tlbc_enabled) {
_PyIndexPool_FreeIndex(&interp->tlbc_indices, tstate->tlbc_index);
}
}
static _PyCodeArray *
_PyCodeArray_New(Py_ssize_t size)
{
_PyCodeArray *arr = PyMem_Calloc(
1, offsetof(_PyCodeArray, entries) + sizeof(void *) * size);
if (arr == NULL) {
PyErr_NoMemory();
return NULL;
}
arr->size = size;
return arr;
}
static void
copy_code(_Py_CODEUNIT *dst, PyCodeObject *co)
{
int code_len = (int) Py_SIZE(co);
for (int i = 0; i < code_len; i += _PyInstruction_GetLength(co, i)) {
dst[i] = _Py_GetBaseCodeUnit(co, i);
}
_PyCode_Quicken(dst, code_len, co->co_consts, 1);
}
static Py_ssize_t
get_pow2_greater(Py_ssize_t initial, Py_ssize_t limit)
{
// initial must be a power of two
assert(!(initial & (initial - 1)));
Py_ssize_t res = initial;
while (res && res < limit) {
res <<= 1;
}
return res;
}
static _Py_CODEUNIT *
create_tlbc_lock_held(PyCodeObject *co, Py_ssize_t idx)
{
_PyCodeArray *tlbc = co->co_tlbc;
if (idx >= tlbc->size) {
Py_ssize_t new_size = get_pow2_greater(tlbc->size, idx + 1);
if (!new_size) {
PyErr_NoMemory();
return NULL;
}
_PyCodeArray *new_tlbc = _PyCodeArray_New(new_size);
if (new_tlbc == NULL) {
return NULL;
}
memcpy(new_tlbc->entries, tlbc->entries, tlbc->size * sizeof(void *));
_Py_atomic_store_ptr_release(&co->co_tlbc, new_tlbc);
_PyMem_FreeDelayed(tlbc);
tlbc = new_tlbc;
}
char *bc = PyMem_Calloc(1, _PyCode_NBYTES(co));
if (bc == NULL) {
PyErr_NoMemory();
return NULL;
}
copy_code((_Py_CODEUNIT *) bc, co);
assert(tlbc->entries[idx] == NULL);
tlbc->entries[idx] = bc;
return (_Py_CODEUNIT *) bc;
}
static _Py_CODEUNIT *
get_tlbc_lock_held(PyCodeObject *co)
{
_PyCodeArray *tlbc = co->co_tlbc;
_PyThreadStateImpl *tstate = (_PyThreadStateImpl *)PyThreadState_GET();
int32_t idx = tstate->tlbc_index;
if (idx < tlbc->size && tlbc->entries[idx] != NULL) {
return (_Py_CODEUNIT *)tlbc->entries[idx];
}
return create_tlbc_lock_held(co, idx);
}
_Py_CODEUNIT *
_PyCode_GetTLBC(PyCodeObject *co)
{
_Py_CODEUNIT *result;
Py_BEGIN_CRITICAL_SECTION(co);
result = get_tlbc_lock_held(co);
Py_END_CRITICAL_SECTION();
return result;
}
// My kingdom for a bitset
struct flag_set {
uint8_t *flags;
Py_ssize_t size;
};
static inline int
flag_is_set(struct flag_set *flags, Py_ssize_t idx)
{
assert(idx >= 0);
return (idx < flags->size) && flags->flags[idx];
}
// Set the flag for each tlbc index in use
static int
get_indices_in_use(PyInterpreterState *interp, struct flag_set *in_use)
{
assert(interp->stoptheworld.world_stopped);
assert(in_use->flags == NULL);
int32_t max_index = 0;
_Py_FOR_EACH_TSTATE_BEGIN(interp, p) {
int32_t idx = ((_PyThreadStateImpl *) p)->tlbc_index;
if (idx > max_index) {
max_index = idx;
}
}
_Py_FOR_EACH_TSTATE_END(interp);
in_use->size = (size_t) max_index + 1;
in_use->flags = PyMem_Calloc(in_use->size, sizeof(*in_use->flags));
if (in_use->flags == NULL) {
return -1;
}
_Py_FOR_EACH_TSTATE_BEGIN(interp, p) {
in_use->flags[((_PyThreadStateImpl *) p)->tlbc_index] = 1;
}
_Py_FOR_EACH_TSTATE_END(interp);
return 0;
}
struct get_code_args {
_PyObjectStack code_objs;
struct flag_set indices_in_use;
int err;
};
static void
clear_get_code_args(struct get_code_args *args)
{
if (args->indices_in_use.flags != NULL) {
PyMem_Free(args->indices_in_use.flags);
args->indices_in_use.flags = NULL;
}
_PyObjectStack_Clear(&args->code_objs);
}
static inline int
is_bytecode_unused(_PyCodeArray *tlbc, Py_ssize_t idx,
struct flag_set *indices_in_use)
{
assert(idx > 0 && idx < tlbc->size);
return tlbc->entries[idx] != NULL && !flag_is_set(indices_in_use, idx);
}
static int
get_code_with_unused_tlbc(PyObject *obj, struct get_code_args *args)
{
if (!PyCode_Check(obj)) {
return 1;
}
PyCodeObject *co = (PyCodeObject *) obj;
_PyCodeArray *tlbc = co->co_tlbc;
// The first index always points at the main copy of the bytecode embedded
// in the code object.
for (Py_ssize_t i = 1; i < tlbc->size; i++) {
if (is_bytecode_unused(tlbc, i, &args->indices_in_use)) {
if (_PyObjectStack_Push(&args->code_objs, obj) < 0) {
args->err = -1;
return 0;
}
return 1;
}
}
return 1;
}
static void
free_unused_bytecode(PyCodeObject *co, struct flag_set *indices_in_use)
{
_PyCodeArray *tlbc = co->co_tlbc;
// The first index always points at the main copy of the bytecode embedded
// in the code object.
for (Py_ssize_t i = 1; i < tlbc->size; i++) {
if (is_bytecode_unused(tlbc, i, indices_in_use)) {
PyMem_Free(tlbc->entries[i]);
tlbc->entries[i] = NULL;
}
}
}
int
_Py_ClearUnusedTLBC(PyInterpreterState *interp)
{
struct get_code_args args = {
.code_objs = {NULL},
.indices_in_use = {NULL, 0},
.err = 0,
};
_PyEval_StopTheWorld(interp);
// Collect in-use tlbc indices
if (get_indices_in_use(interp, &args.indices_in_use) < 0) {
goto err;
}
// Collect code objects that have bytecode not in use by any thread
_PyGC_VisitObjectsWorldStopped(
interp, (gcvisitobjects_t)get_code_with_unused_tlbc, &args);
if (args.err < 0) {
goto err;
}
// Free unused bytecode. This must happen outside of gc_visit_heaps; it is
// unsafe to allocate or free any mimalloc managed memory when it's
// running.
PyObject *obj;
while ((obj = _PyObjectStack_Pop(&args.code_objs)) != NULL) {
free_unused_bytecode((PyCodeObject*) obj, &args.indices_in_use);
}
_PyEval_StartTheWorld(interp);
clear_get_code_args(&args);
return 0;
err:
_PyEval_StartTheWorld(interp);
clear_get_code_args(&args);
PyErr_NoMemory();
return -1;
}
#endif
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