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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) {
if (self->_co_cached == NULL) {
self->_co_cached = PyMem_New(_PyCoCached, 1);
if (self->_co_cached == NULL) {
PyErr_NoMemory();
return -1;
}
self->_co_cached->_co_code = NULL;
self->_co_cached->_co_cellvars = NULL;
self->_co_cached->_co_freevars = NULL;
self->_co_cached->_co_varnames = NULL;
}
return 0;
}
/******************
* _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)
{