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Copy pathframeobject.c
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2192 lines (1950 loc) · 63.2 KB
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/* Frame object implementation */
#include "Python.h"
#include "pycore_ceval.h" // _PyEval_BuiltinsFromGlobals()
#include "pycore_code.h" // CO_FAST_LOCAL, etc.
#include "pycore_function.h" // _PyFunction_FromConstructor()
#include "pycore_moduleobject.h" // _PyModule_GetDict()
#include "pycore_object.h" // _PyObject_GC_UNTRACK()
#include "pycore_opcode_metadata.h" // _PyOpcode_Deopt, _PyOpcode_Caches
#include "frameobject.h" // PyFrameObject
#include "pycore_frame.h"
#include "opcode.h" // EXTENDED_ARG
#define OFF(x) offsetof(PyFrameObject, x)
// Returns borrowed reference or NULL
static PyObject *
framelocalsproxy_getval(_PyInterpreterFrame *frame, PyCodeObject *co, int i)
{
PyObject **fast = _PyFrame_GetLocalsArray(frame);
_PyLocals_Kind kind = _PyLocals_GetKind(co->co_localspluskinds, i);
PyObject *value = fast[i];
PyObject *cell = NULL;
if (value == NULL) {
return NULL;
}
if (kind == CO_FAST_FREE || kind & CO_FAST_CELL) {
// The cell was set when the frame was created from
// the function's closure.
assert(PyCell_Check(value));
cell = value;
}
if (cell != NULL) {
value = PyCell_GET(cell);
}
if (value == NULL) {
return NULL;
}
return value;
}
static int
framelocalsproxy_getkeyindex(PyFrameObject *frame, PyObject* key, bool read)
{
/*
* Returns -2 (!) if an error occurred; exception will be set.
* Returns the fast locals index of the key on success:
* - if read == true, returns the index if the value is not NULL
* - if read == false, returns the index if the value is not hidden
* Otherwise returns -1.
*/
PyCodeObject *co = _PyFrame_GetCode(frame->f_frame);
// Ensure that the key is hashable.
Py_hash_t key_hash = PyObject_Hash(key);
if (key_hash == -1) {
return -2;
}
bool found = false;
// We do 2 loops here because it's highly possible the key is interned
// and we can do a pointer comparison.
for (int i = 0; i < co->co_nlocalsplus; i++) {
PyObject *name = PyTuple_GET_ITEM(co->co_localsplusnames, i);
if (name == key) {
if (read) {
if (framelocalsproxy_getval(frame->f_frame, co, i) != NULL) {
return i;
}
} else {
if (!(_PyLocals_GetKind(co->co_localspluskinds, i) & CO_FAST_HIDDEN)) {
return i;
}
}
found = true;
}
}
if (found) {
// This is an attempt to read an unset local variable or
// write to a variable that is hidden from regular write operations
return -1;
}
// This is unlikely, but we need to make sure. This means the key
// is not interned.
for (int i = 0; i < co->co_nlocalsplus; i++) {
PyObject *name = PyTuple_GET_ITEM(co->co_localsplusnames, i);
Py_hash_t name_hash = PyObject_Hash(name);
assert(name_hash != -1); // keys are exact unicode
if (name_hash != key_hash) {
continue;
}
int same = PyObject_RichCompareBool(name, key, Py_EQ);
if (same < 0) {
return -2;
}
if (same) {
if (read) {
if (framelocalsproxy_getval(frame->f_frame, co, i) != NULL) {
return i;
}
} else {
if (!(_PyLocals_GetKind(co->co_localspluskinds, i) & CO_FAST_HIDDEN)) {
return i;
}
}
}
}
return -1;
}
static PyObject *
framelocalsproxy_getitem(PyObject *self, PyObject *key)
{
PyFrameObject* frame = ((PyFrameLocalsProxyObject*)self)->frame;
PyCodeObject* co = _PyFrame_GetCode(frame->f_frame);
int i = framelocalsproxy_getkeyindex(frame, key, true);
if (i == -2) {
return NULL;
}
if (i >= 0) {
PyObject *value = framelocalsproxy_getval(frame->f_frame, co, i);
assert(value != NULL);
return Py_NewRef(value);
}
// Okay not in the fast locals, try extra locals
PyObject *extra = frame->f_extra_locals;
if (extra != NULL) {
PyObject *value = PyDict_GetItem(extra, key);
if (value != NULL) {
return Py_NewRef(value);
}
}
PyErr_Format(PyExc_KeyError, "local variable '%R' is not defined", key);
return NULL;
}
static int
framelocalsproxy_setitem(PyObject *self, PyObject *key, PyObject *value)
{
/* Merge locals into fast locals */
PyFrameObject* frame = ((PyFrameLocalsProxyObject*)self)->frame;
PyObject** fast = _PyFrame_GetLocalsArray(frame->f_frame);
PyCodeObject* co = _PyFrame_GetCode(frame->f_frame);
if (value == NULL) {
PyErr_SetString(PyExc_TypeError, "cannot remove variables from FrameLocalsProxy");
return -1;
}
int i = framelocalsproxy_getkeyindex(frame, key, false);
if (i == -2) {
return -1;
}
if (i >= 0) {
_Py_Executors_InvalidateDependency(PyInterpreterState_Get(), co, 1);
_PyLocals_Kind kind = _PyLocals_GetKind(co->co_localspluskinds, i);
PyObject *oldvalue = fast[i];
PyObject *cell = NULL;
if (kind == CO_FAST_FREE) {
// The cell was set when the frame was created from
// the function's closure.
assert(oldvalue != NULL && PyCell_Check(oldvalue));
cell = oldvalue;
} else if (kind & CO_FAST_CELL && oldvalue != NULL) {
if (PyCell_Check(oldvalue)) {
cell = oldvalue;
}
}
if (cell != NULL) {
oldvalue = PyCell_GET(cell);
if (value != oldvalue) {
PyCell_SET(cell, Py_XNewRef(value));
Py_XDECREF(oldvalue);
}
} else if (value != oldvalue) {
Py_XSETREF(fast[i], Py_NewRef(value));
}
return 0;
}
// Okay not in the fast locals, try extra locals
PyObject *extra = frame->f_extra_locals;
if (extra == NULL) {
extra = PyDict_New();
if (extra == NULL) {
return -1;
}
frame->f_extra_locals = extra;
}
assert(PyDict_Check(extra));
return PyDict_SetItem(extra, key, value);
}
static int
framelocalsproxy_merge(PyObject* self, PyObject* other)
{
if (!PyDict_Check(other) && !PyFrameLocalsProxy_Check(other)) {
return -1;
}
PyObject *keys = PyMapping_Keys(other);
if (keys == NULL) {
return -1;
}
PyObject *iter = PyObject_GetIter(keys);
Py_DECREF(keys);
if (iter == NULL) {
return -1;
}
PyObject *key = NULL;
PyObject *value = NULL;
while ((key = PyIter_Next(iter)) != NULL) {
value = PyObject_GetItem(other, key);
if (value == NULL) {
Py_DECREF(key);
Py_DECREF(iter);
return -1;
}
if (framelocalsproxy_setitem(self, key, value) < 0) {
Py_DECREF(key);
Py_DECREF(value);
Py_DECREF(iter);
return -1;
}
Py_DECREF(key);
Py_DECREF(value);
}
Py_DECREF(iter);
return 0;
}
static PyObject *
framelocalsproxy_keys(PyObject *self, void *Py_UNUSED(ignored))
{
PyFrameObject *frame = ((PyFrameLocalsProxyObject*)self)->frame;
PyCodeObject *co = _PyFrame_GetCode(frame->f_frame);
PyObject *names = PyList_New(0);
if (names == NULL) {
return NULL;
}
for (int i = 0; i < co->co_nlocalsplus; i++) {
PyObject *val = framelocalsproxy_getval(frame->f_frame, co, i);
if (val) {
PyObject *name = PyTuple_GET_ITEM(co->co_localsplusnames, i);
if (PyList_Append(names, name) < 0) {
Py_DECREF(names);
return NULL;
}
}
}
// Iterate through the extra locals
if (frame->f_extra_locals) {
assert(PyDict_Check(frame->f_extra_locals));
Py_ssize_t i = 0;
PyObject *key = NULL;
PyObject *value = NULL;
while (PyDict_Next(frame->f_extra_locals, &i, &key, &value)) {
if (PyList_Append(names, key) < 0) {
Py_DECREF(names);
return NULL;
}
}
}
return names;
}
static void
framelocalsproxy_dealloc(PyObject *self)
{
PyObject_GC_UnTrack(self);
Py_CLEAR(((PyFrameLocalsProxyObject*)self)->frame);
Py_TYPE(self)->tp_free(self);
}
static PyObject *
framelocalsproxy_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
if (PyTuple_GET_SIZE(args) != 1) {
PyErr_Format(PyExc_TypeError,
"FrameLocalsProxy expected 1 argument, got %zd",
PyTuple_GET_SIZE(args));
return NULL;
}
PyObject *item = PyTuple_GET_ITEM(args, 0);
if (!PyFrame_Check(item)) {
PyErr_Format(PyExc_TypeError, "expect frame, not %T", item);
return NULL;
}
PyFrameObject *frame = (PyFrameObject*)item;
if (kwds != NULL && PyDict_Size(kwds) != 0) {
PyErr_SetString(PyExc_TypeError,
"FrameLocalsProxy takes no keyword arguments");
return 0;
}
PyFrameLocalsProxyObject *self = (PyFrameLocalsProxyObject *)type->tp_alloc(type, 0);
if (self == NULL) {
return NULL;
}
((PyFrameLocalsProxyObject*)self)->frame = (PyFrameObject*)Py_NewRef(frame);
return (PyObject *)self;
}
static int
framelocalsproxy_tp_clear(PyObject *self)
{
Py_CLEAR(((PyFrameLocalsProxyObject*)self)->frame);
return 0;
}
static int
framelocalsproxy_visit(PyObject *self, visitproc visit, void *arg)
{
Py_VISIT(((PyFrameLocalsProxyObject*)self)->frame);
return 0;
}
static PyObject *
framelocalsproxy_iter(PyObject *self)
{
PyObject* keys = framelocalsproxy_keys(self, NULL);
if (keys == NULL) {
return NULL;
}
PyObject* iter = PyObject_GetIter(keys);
Py_XDECREF(keys);
return iter;
}
static PyObject *
framelocalsproxy_richcompare(PyObject *self, PyObject *other, int op)
{
if (PyFrameLocalsProxy_Check(other)) {
bool result = ((PyFrameLocalsProxyObject*)self)->frame == ((PyFrameLocalsProxyObject*)other)->frame;
if (op == Py_EQ) {
return PyBool_FromLong(result);
} else if (op == Py_NE) {
return PyBool_FromLong(!result);
}
} else if (PyDict_Check(other)) {
PyObject *dct = PyDict_New();
if (dct == NULL) {
return NULL;
}
if (PyDict_Update(dct, self) < 0) {
Py_DECREF(dct);
return NULL;
}
PyObject *result = PyObject_RichCompare(dct, other, op);
Py_DECREF(dct);
return result;
}
Py_RETURN_NOTIMPLEMENTED;
}
static PyObject *
framelocalsproxy_repr(PyObject *self)
{
int i = Py_ReprEnter(self);
if (i != 0) {
return i > 0 ? PyUnicode_FromString("{...}") : NULL;
}
PyObject *dct = PyDict_New();
if (dct == NULL) {
Py_ReprLeave(self);
return NULL;
}
if (PyDict_Update(dct, self) < 0) {
Py_DECREF(dct);
Py_ReprLeave(self);
return NULL;
}
PyObject *repr = PyObject_Repr(dct);
Py_DECREF(dct);
Py_ReprLeave(self);
return repr;
}
static PyObject*
framelocalsproxy_or(PyObject *self, PyObject *other)
{
if (!PyDict_Check(other) && !PyFrameLocalsProxy_Check(other)) {
Py_RETURN_NOTIMPLEMENTED;
}
PyObject *result = PyDict_New();
if (result == NULL) {
return NULL;
}
if (PyDict_Update(result, self) < 0) {
Py_DECREF(result);
return NULL;
}
if (PyDict_Update(result, other) < 0) {
Py_DECREF(result);
return NULL;
}
return result;
}
static PyObject*
framelocalsproxy_inplace_or(PyObject *self, PyObject *other)
{
if (!PyDict_Check(other) && !PyFrameLocalsProxy_Check(other)) {
Py_RETURN_NOTIMPLEMENTED;
}
if (framelocalsproxy_merge(self, other) < 0) {
Py_RETURN_NOTIMPLEMENTED;
}
return Py_NewRef(self);
}
static PyObject*
framelocalsproxy_values(PyObject *self, void *Py_UNUSED(ignored))
{
PyFrameObject *frame = ((PyFrameLocalsProxyObject*)self)->frame;
PyCodeObject *co = _PyFrame_GetCode(frame->f_frame);
PyObject *values = PyList_New(0);
if (values == NULL) {
return NULL;
}
for (int i = 0; i < co->co_nlocalsplus; i++) {
PyObject *value = framelocalsproxy_getval(frame->f_frame, co, i);
if (value) {
if (PyList_Append(values, value) < 0) {
Py_DECREF(values);
return NULL;
}
}
}
// Iterate through the extra locals
if (frame->f_extra_locals) {
Py_ssize_t j = 0;
PyObject *key = NULL;
PyObject *value = NULL;
while (PyDict_Next(frame->f_extra_locals, &j, &key, &value)) {
if (PyList_Append(values, value) < 0) {
Py_DECREF(values);
return NULL;
}
}
}
return values;
}
static PyObject *
framelocalsproxy_items(PyObject *self, void *Py_UNUSED(ignored))
{
PyFrameObject *frame = ((PyFrameLocalsProxyObject*)self)->frame;
PyCodeObject *co = _PyFrame_GetCode(frame->f_frame);
PyObject *items = PyList_New(0);
if (items == NULL) {
return NULL;
}
for (int i = 0; i < co->co_nlocalsplus; i++) {
PyObject *name = PyTuple_GET_ITEM(co->co_localsplusnames, i);
PyObject *value = framelocalsproxy_getval(frame->f_frame, co, i);
if (value) {
PyObject *pair = PyTuple_Pack(2, name, value);
if (pair == NULL) {
Py_DECREF(items);
return NULL;
}
if (PyList_Append(items, pair) < 0) {
Py_DECREF(items);
Py_DECREF(pair);
return NULL;
}
Py_DECREF(pair);
}
}
// Iterate through the extra locals
if (frame->f_extra_locals) {
Py_ssize_t j = 0;
PyObject *key = NULL;
PyObject *value = NULL;
while (PyDict_Next(frame->f_extra_locals, &j, &key, &value)) {
PyObject *pair = PyTuple_Pack(2, key, value);
if (pair == NULL) {
Py_DECREF(items);
return NULL;
}
if (PyList_Append(items, pair) < 0) {
Py_DECREF(items);
Py_DECREF(pair);
return NULL;
}
Py_DECREF(pair);
}
}
return items;
}
static Py_ssize_t
framelocalsproxy_length(PyObject *self)
{
PyFrameObject *frame = ((PyFrameLocalsProxyObject*)self)->frame;
PyCodeObject *co = _PyFrame_GetCode(frame->f_frame);
Py_ssize_t size = 0;
if (frame->f_extra_locals != NULL) {
assert(PyDict_Check(frame->f_extra_locals));
size += PyDict_Size(frame->f_extra_locals);
}
for (int i = 0; i < co->co_nlocalsplus; i++) {
if (framelocalsproxy_getval(frame->f_frame, co, i) != NULL) {
size++;
}
}
return size;
}
static int
framelocalsproxy_contains(PyObject *self, PyObject *key)
{
PyFrameObject *frame = ((PyFrameLocalsProxyObject*)self)->frame;
int i = framelocalsproxy_getkeyindex(frame, key, true);
if (i == -2) {
return -1;
}
if (i >= 0) {
return 1;
}
PyObject *extra = ((PyFrameObject*)frame)->f_extra_locals;
if (extra != NULL) {
return PyDict_Contains(extra, key);
}
return 0;
}
static PyObject* framelocalsproxy___contains__(PyObject *self, PyObject *key)
{
int result = framelocalsproxy_contains(self, key);
if (result < 0) {
return NULL;
}
return PyBool_FromLong(result);
}
static PyObject*
framelocalsproxy_update(PyObject *self, PyObject *other)
{
if (framelocalsproxy_merge(self, other) < 0) {
PyErr_SetString(PyExc_TypeError, "update() argument must be dict or another FrameLocalsProxy");
return NULL;
}
Py_RETURN_NONE;
}
static PyObject*
framelocalsproxy_get(PyObject* self, PyObject *const *args, Py_ssize_t nargs)
{
if (nargs < 1 || nargs > 2) {
PyErr_SetString(PyExc_TypeError, "get expected 1 or 2 arguments");
return NULL;
}
PyObject *key = args[0];
PyObject *default_value = Py_None;
if (nargs == 2) {
default_value = args[1];
}
PyObject *result = framelocalsproxy_getitem(self, key);
if (result == NULL) {
if (PyErr_ExceptionMatches(PyExc_KeyError)) {
PyErr_Clear();
return Py_XNewRef(default_value);
}
return NULL;
}
return result;
}
static PyObject*
framelocalsproxy_setdefault(PyObject* self, PyObject *const *args, Py_ssize_t nargs)
{
if (nargs < 1 || nargs > 2) {
PyErr_SetString(PyExc_TypeError, "setdefault expected 1 or 2 arguments");
return NULL;
}
PyObject *key = args[0];
PyObject *default_value = Py_None;
if (nargs == 2) {
default_value = args[1];
}
PyObject *result = framelocalsproxy_getitem(self, key);
if (result == NULL) {
if (PyErr_ExceptionMatches(PyExc_KeyError)) {
PyErr_Clear();
if (framelocalsproxy_setitem(self, key, default_value) < 0) {
return NULL;
}
return Py_XNewRef(default_value);
}
return NULL;
}
return result;
}
static PyObject*
framelocalsproxy_copy(PyObject *self, PyObject *Py_UNUSED(ignored))
{
PyObject* result = PyDict_New();
if (result == NULL) {
return NULL;
}
if (PyDict_Update(result, self) < 0) {
Py_DECREF(result);
return NULL;
}
return result;
}
static PyObject*
framelocalsproxy_reversed(PyObject *self, void *Py_UNUSED(ignored))
{
PyObject *result = framelocalsproxy_keys(self, NULL);
if (result == NULL) {
return NULL;
}
if (PyList_Reverse(result) < 0) {
Py_DECREF(result);
return NULL;
}
return result;
}
static PyNumberMethods framelocalsproxy_as_number = {
.nb_or = framelocalsproxy_or,
.nb_inplace_or = framelocalsproxy_inplace_or,
};
static PySequenceMethods framelocalsproxy_as_sequence = {
.sq_contains = framelocalsproxy_contains,
};
static PyMappingMethods framelocalsproxy_as_mapping = {
framelocalsproxy_length, // mp_length
framelocalsproxy_getitem, // mp_subscript
framelocalsproxy_setitem, // mp_ass_subscript
};
static PyMethodDef framelocalsproxy_methods[] = {
{"__contains__", framelocalsproxy___contains__, METH_O | METH_COEXIST,
NULL},
{"__getitem__", framelocalsproxy_getitem, METH_O | METH_COEXIST,
NULL},
{"update", framelocalsproxy_update, METH_O,
NULL},
{"__reversed__", _PyCFunction_CAST(framelocalsproxy_reversed), METH_NOARGS,
NULL},
{"copy", _PyCFunction_CAST(framelocalsproxy_copy), METH_NOARGS,
NULL},
{"keys", _PyCFunction_CAST(framelocalsproxy_keys), METH_NOARGS,
NULL},
{"values", _PyCFunction_CAST(framelocalsproxy_values), METH_NOARGS,
NULL},
{"items", _PyCFunction_CAST(framelocalsproxy_items), METH_NOARGS,
NULL},
{"get", _PyCFunction_CAST(framelocalsproxy_get), METH_FASTCALL,
NULL},
{"setdefault", _PyCFunction_CAST(framelocalsproxy_setdefault), METH_FASTCALL,
NULL},
{NULL, NULL} /* sentinel */
};
PyTypeObject PyFrameLocalsProxy_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
.tp_name = "FrameLocalsProxy",
.tp_basicsize = sizeof(PyFrameLocalsProxyObject),
.tp_dealloc = (destructor)framelocalsproxy_dealloc,
.tp_repr = &framelocalsproxy_repr,
.tp_as_number = &framelocalsproxy_as_number,
.tp_as_sequence = &framelocalsproxy_as_sequence,
.tp_as_mapping = &framelocalsproxy_as_mapping,
.tp_getattro = PyObject_GenericGetAttr,
.tp_setattro = PyObject_GenericSetAttr,
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_MAPPING,
.tp_traverse = framelocalsproxy_visit,
.tp_clear = framelocalsproxy_tp_clear,
.tp_richcompare = framelocalsproxy_richcompare,
.tp_iter = framelocalsproxy_iter,
.tp_methods = framelocalsproxy_methods,
.tp_alloc = PyType_GenericAlloc,
.tp_new = framelocalsproxy_new,
.tp_free = PyObject_GC_Del,
};
PyObject *
_PyFrameLocalsProxy_New(PyFrameObject *frame)
{
PyObject* args = PyTuple_Pack(1, frame);
if (args == NULL) {
return NULL;
}
PyObject* proxy = (PyObject*)framelocalsproxy_new(&PyFrameLocalsProxy_Type, args, NULL);
Py_DECREF(args);
return proxy;
}
static PyMemberDef frame_memberlist[] = {
{"f_trace_lines", Py_T_BOOL, OFF(f_trace_lines), 0},
{NULL} /* Sentinel */
};
static PyObject *
frame_getlocals(PyFrameObject *f, void *closure)
{
if (f == NULL) {
PyErr_BadInternalCall();
return NULL;
}
assert(!_PyFrame_IsIncomplete(f->f_frame));
PyCodeObject *co = _PyFrame_GetCode(f->f_frame);
if (!(co->co_flags & CO_OPTIMIZED) && !_PyFrame_HasHiddenLocals(f->f_frame)) {
if (f->f_frame->f_locals == NULL) {
// We found cases when f_locals is NULL for non-optimized code.
// We fill the f_locals with an empty dict to avoid crash until
// we find the root cause.
f->f_frame->f_locals = PyDict_New();
if (f->f_frame->f_locals == NULL) {
return NULL;
}
}
return Py_NewRef(f->f_frame->f_locals);
}
return _PyFrameLocalsProxy_New(f);
}
int
PyFrame_GetLineNumber(PyFrameObject *f)
{
assert(f != NULL);
if (f->f_lineno == -1) {
// We should calculate it once. If we can't get the line number,
// set f->f_lineno to 0.
f->f_lineno = PyUnstable_InterpreterFrame_GetLine(f->f_frame);
if (f->f_lineno < 0) {
f->f_lineno = 0;
return -1;
}
}
if (f->f_lineno > 0) {
return f->f_lineno;
}
return PyUnstable_InterpreterFrame_GetLine(f->f_frame);
}
static PyObject *
frame_getlineno(PyFrameObject *f, void *closure)
{
int lineno = PyFrame_GetLineNumber(f);
if (lineno < 0) {
Py_RETURN_NONE;
}
else {
return PyLong_FromLong(lineno);
}
}
static PyObject *
frame_getlasti(PyFrameObject *f, void *closure)
{
int lasti = _PyInterpreterFrame_LASTI(f->f_frame);
if (lasti < 0) {
return PyLong_FromLong(-1);
}
return PyLong_FromLong(lasti * sizeof(_Py_CODEUNIT));
}
static PyObject *
frame_getglobals(PyFrameObject *f, void *closure)
{
PyObject *globals = f->f_frame->f_globals;
if (globals == NULL) {
globals = Py_None;
}
return Py_NewRef(globals);
}
static PyObject *
frame_getbuiltins(PyFrameObject *f, void *closure)
{
PyObject *builtins = f->f_frame->f_builtins;
if (builtins == NULL) {
builtins = Py_None;
}
return Py_NewRef(builtins);
}
static PyObject *
frame_getcode(PyFrameObject *f, void *closure)
{
if (PySys_Audit("object.__getattr__", "Os", f, "f_code") < 0) {
return NULL;
}
return (PyObject *)PyFrame_GetCode(f);
}
static PyObject *
frame_getback(PyFrameObject *f, void *closure)
{
PyObject *res = (PyObject *)PyFrame_GetBack(f);
if (res == NULL) {
Py_RETURN_NONE;
}
return res;
}
static PyObject *
frame_gettrace_opcodes(PyFrameObject *f, void *closure)
{
PyObject *result = f->f_trace_opcodes ? Py_True : Py_False;
return Py_NewRef(result);
}
static int
frame_settrace_opcodes(PyFrameObject *f, PyObject* value, void *Py_UNUSED(ignored))
{
if (!PyBool_Check(value)) {
PyErr_SetString(PyExc_TypeError,
"attribute value type must be bool");
return -1;
}
if (value == Py_True) {
f->f_trace_opcodes = 1;
if (f->f_trace) {
return _PyEval_SetOpcodeTrace(f, true);
}
}
else {
f->f_trace_opcodes = 0;
return _PyEval_SetOpcodeTrace(f, false);
}
return 0;
}
/* Model the evaluation stack, to determine which jumps
* are safe and how many values needs to be popped.
* The stack is modelled by a 64 integer, treating any
* stack that can't fit into 64 bits as "overflowed".
*/
typedef enum kind {
Iterator = 1,
Except = 2,
Object = 3,
Null = 4,
Lasti = 5,
} Kind;
static int
compatible_kind(Kind from, Kind to) {
if (to == 0) {
return 0;
}
if (to == Object) {
return from != Null;
}
if (to == Null) {
return 1;
}
return from == to;
}
#define BITS_PER_BLOCK 3
#define UNINITIALIZED -2
#define OVERFLOWED -1
#define MAX_STACK_ENTRIES (63/BITS_PER_BLOCK)
#define WILL_OVERFLOW (1ULL<<((MAX_STACK_ENTRIES-1)*BITS_PER_BLOCK))
#define EMPTY_STACK 0
static inline int64_t
push_value(int64_t stack, Kind kind)
{
if (((uint64_t)stack) >= WILL_OVERFLOW) {
return OVERFLOWED;
}
else {
return (stack << BITS_PER_BLOCK) | kind;
}
}
static inline int64_t
pop_value(int64_t stack)
{
return Py_ARITHMETIC_RIGHT_SHIFT(int64_t, stack, BITS_PER_BLOCK);
}
#define MASK ((1<<BITS_PER_BLOCK)-1)
static inline Kind
top_of_stack(int64_t stack)
{
return stack & MASK;
}
static inline Kind
peek(int64_t stack, int n)
{
assert(n >= 1);
return (stack>>(BITS_PER_BLOCK*(n-1))) & MASK;
}
static Kind
stack_swap(int64_t stack, int n)
{
assert(n >= 1);
Kind to_swap = peek(stack, n);
Kind top = top_of_stack(stack);