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-rw-r--r--Objects/frameobject.c231
1 files changed, 136 insertions, 95 deletions
diff --git a/Objects/frameobject.c b/Objects/frameobject.c
index 287d5bd..15e1928 100644
--- a/Objects/frameobject.c
+++ b/Objects/frameobject.c
@@ -1109,81 +1109,106 @@ _PyFrame_OpAlreadyRan(_PyInterpreterFrame *frame, int opcode, int oparg)
return 0;
}
+
+// Initialize frame free variables if needed
+static void
+frame_init_get_vars(_PyInterpreterFrame *frame)
+{
+ // COPY_FREE_VARS has no quickened forms, so no need to use _PyOpcode_Deopt
+ // here:
+ PyCodeObject *co = frame->f_code;
+ int lasti = _PyInterpreterFrame_LASTI(frame);
+ if (!(lasti < 0 && _Py_OPCODE(_PyCode_CODE(co)[0]) == COPY_FREE_VARS
+ && PyFunction_Check(frame->f_funcobj)))
+ {
+ /* Free vars are initialized */
+ return;
+ }
+
+ /* Free vars have not been initialized -- Do that */
+ PyObject *closure = ((PyFunctionObject *)frame->f_funcobj)->func_closure;
+ int offset = co->co_nlocals + co->co_nplaincellvars;
+ for (int i = 0; i < co->co_nfreevars; ++i) {
+ PyObject *o = PyTuple_GET_ITEM(closure, i);
+ frame->localsplus[offset + i] = Py_NewRef(o);
+ }
+ // COPY_FREE_VARS doesn't have inline CACHEs, either:
+ frame->prev_instr = _PyCode_CODE(frame->f_code);
+}
+
+
+static int
+frame_get_var(_PyInterpreterFrame *frame, PyCodeObject *co, int i,
+ PyObject **pvalue)
+{
+ _PyLocals_Kind kind = _PyLocals_GetKind(co->co_localspluskinds, i);
+
+ /* If the namespace is unoptimized, then one of the
+ following cases applies:
+ 1. It does not contain free variables, because it
+ uses import * or is a top-level namespace.
+ 2. It is a class namespace.
+ We don't want to accidentally copy free variables
+ into the locals dict used by the class.
+ */
+ if (kind & CO_FAST_FREE && !(co->co_flags & CO_OPTIMIZED)) {
+ return 0;
+ }
+
+ PyObject *value = frame->localsplus[i];
+ if (frame->stacktop) {
+ if (kind & CO_FAST_FREE) {
+ // The cell was set by COPY_FREE_VARS.
+ assert(value != NULL && PyCell_Check(value));
+ value = PyCell_GET(value);
+ }
+ else if (kind & CO_FAST_CELL) {
+ // Note that no *_DEREF ops can happen before MAKE_CELL
+ // executes. So there's no need to duplicate the work
+ // that MAKE_CELL would otherwise do later, if it hasn't
+ // run yet.
+ if (value != NULL) {
+ if (PyCell_Check(value) &&
+ _PyFrame_OpAlreadyRan(frame, MAKE_CELL, i)) {
+ // (likely) MAKE_CELL must have executed already.
+ value = PyCell_GET(value);
+ }
+ // (likely) Otherwise it it is an arg (kind & CO_FAST_LOCAL),
+ // with the initial value set when the frame was created...
+ // (unlikely) ...or it was set to some initial value by
+ // an earlier call to PyFrame_LocalsToFast().
+ }
+ }
+ }
+ else {
+ assert(value == NULL);
+ }
+ *pvalue = value;
+ return 1;
+}
+
int
-_PyFrame_FastToLocalsWithError(_PyInterpreterFrame *frame) {
+_PyFrame_FastToLocalsWithError(_PyInterpreterFrame *frame)
+{
/* Merge fast locals into f->f_locals */
- PyObject *locals;
- PyObject **fast;
- PyCodeObject *co;
- locals = frame->f_locals;
+ PyObject *locals = frame->f_locals;
if (locals == NULL) {
locals = frame->f_locals = PyDict_New();
- if (locals == NULL)
+ if (locals == NULL) {
return -1;
- }
- co = frame->f_code;
- fast = _PyFrame_GetLocalsArray(frame);
- // COPY_FREE_VARS has no quickened forms, so no need to use _PyOpcode_Deopt
- // here:
- int lasti = _PyInterpreterFrame_LASTI(frame);
- if (lasti < 0 && _Py_OPCODE(_PyCode_CODE(co)[0]) == COPY_FREE_VARS
- && PyFunction_Check(frame->f_funcobj))
- {
- /* Free vars have not been initialized -- Do that */
- PyCodeObject *co = frame->f_code;
- PyObject *closure = ((PyFunctionObject *)frame->f_funcobj)->func_closure;
- int offset = co->co_nlocals + co->co_nplaincellvars;
- for (int i = 0; i < co->co_nfreevars; ++i) {
- PyObject *o = PyTuple_GET_ITEM(closure, i);
- frame->localsplus[offset + i] = Py_NewRef(o);
}
- // COPY_FREE_VARS doesn't have inline CACHEs, either:
- frame->prev_instr = _PyCode_CODE(frame->f_code);
}
- for (int i = 0; i < co->co_nlocalsplus; i++) {
- _PyLocals_Kind kind = _PyLocals_GetKind(co->co_localspluskinds, i);
- /* If the namespace is unoptimized, then one of the
- following cases applies:
- 1. It does not contain free variables, because it
- uses import * or is a top-level namespace.
- 2. It is a class namespace.
- We don't want to accidentally copy free variables
- into the locals dict used by the class.
- */
- if (kind & CO_FAST_FREE && !(co->co_flags & CO_OPTIMIZED)) {
+ frame_init_get_vars(frame);
+
+ PyCodeObject *co = frame->f_code;
+ for (int i = 0; i < co->co_nlocalsplus; i++) {
+ PyObject *value; // borrowed reference
+ if (!frame_get_var(frame, co, i, &value)) {
continue;
}
PyObject *name = PyTuple_GET_ITEM(co->co_localsplusnames, i);
- PyObject *value = fast[i];
- if (frame->stacktop) {
- if (kind & CO_FAST_FREE) {
- // The cell was set by COPY_FREE_VARS.
- assert(value != NULL && PyCell_Check(value));
- value = PyCell_GET(value);
- }
- else if (kind & CO_FAST_CELL) {
- // Note that no *_DEREF ops can happen before MAKE_CELL
- // executes. So there's no need to duplicate the work
- // that MAKE_CELL would otherwise do later, if it hasn't
- // run yet.
- if (value != NULL) {
- if (PyCell_Check(value) &&
- _PyFrame_OpAlreadyRan(frame, MAKE_CELL, i)) {
- // (likely) MAKE_CELL must have executed already.
- value = PyCell_GET(value);
- }
- // (likely) Otherwise it it is an arg (kind & CO_FAST_LOCAL),
- // with the initial value set when the frame was created...
- // (unlikely) ...or it was set to some initial value by
- // an earlier call to PyFrame_LocalsToFast().
- }
- }
- }
- else {
- assert(value == NULL);
- }
if (value == NULL) {
if (PyObject_DelItem(locals, name) != 0) {
if (PyErr_ExceptionMatches(PyExc_KeyError)) {
@@ -1203,6 +1228,54 @@ _PyFrame_FastToLocalsWithError(_PyInterpreterFrame *frame) {
return 0;
}
+
+PyObject *
+PyFrame_GetVar(PyFrameObject *frame_obj, PyObject *name)
+{
+ if (!PyUnicode_Check(name)) {
+ PyErr_Format(PyExc_TypeError, "name must be str, not %s",
+ Py_TYPE(name)->tp_name);
+ return NULL;
+ }
+
+ _PyInterpreterFrame *frame = frame_obj->f_frame;
+ frame_init_get_vars(frame);
+
+ PyCodeObject *co = frame->f_code;
+ for (int i = 0; i < co->co_nlocalsplus; i++) {
+ PyObject *var_name = PyTuple_GET_ITEM(co->co_localsplusnames, i);
+ if (!_PyUnicode_Equal(var_name, name)) {
+ continue;
+ }
+
+ PyObject *value; // borrowed reference
+ if (!frame_get_var(frame, co, i, &value)) {
+ break;
+ }
+ if (value == NULL) {
+ break;
+ }
+ return Py_NewRef(value);
+ }
+
+ PyErr_Format(PyExc_NameError, "variable %R does not exist", name);
+ return NULL;
+}
+
+
+PyObject *
+PyFrame_GetVarString(PyFrameObject *frame, const char *name)
+{
+ PyObject *name_obj = PyUnicode_FromString(name);
+ if (name_obj == NULL) {
+ return NULL;
+ }
+ PyObject *value = PyFrame_GetVar(frame, name_obj);
+ Py_DECREF(name_obj);
+ return value;
+}
+
+
int
PyFrame_FastToLocalsWithError(PyFrameObject *f)
{
@@ -1413,35 +1486,3 @@ _PyEval_BuiltinsFromGlobals(PyThreadState *tstate, PyObject *globals)
return _PyEval_GetBuiltins(tstate);
}
-
-PyObject *
-PyFrame_GetVar(PyFrameObject *frame, PyObject *name)
-{
- PyObject *locals = PyFrame_GetLocals(frame);
- if (locals == NULL) {
- return NULL;
- }
- PyObject *value = PyDict_GetItemWithError(locals, name);
- Py_DECREF(locals);
-
- if (value == NULL) {
- if (PyErr_Occurred()) {
- return NULL;
- }
- PyErr_Format(PyExc_NameError, "variable %R does not exist", name);
- return NULL;
- }
- return Py_NewRef(value);
-}
-
-PyObject *
-PyFrame_GetVarString(PyFrameObject *frame, const char *name)
-{
- PyObject *name_obj = PyUnicode_FromString(name);
- if (name_obj == NULL) {
- return NULL;
- }
- PyObject *value = PyFrame_GetVar(frame, name_obj);
- Py_DECREF(name_obj);
- return value;
-}
generated by cgit v0.12 at 2025-01-11 07:57:30 (GMT)