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gh-98831: rewrite RERAISE and CLEANUP_THROW in the instruction definition DSL by iritkatriel · Pull Request #101511 · python/cpython · GitHub

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gh-98831: rewrite RERAISE and CLEANUP_THROW in the instruction definition DSL #101511

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Merged
iritkatriel merged 3 commits into from
Feb 2, 2023
Conversation 2 Commits 3 Checks 0 Files changed
Merged

gh-98831: rewrite RERAISE and CLEANUP_THROW in the instruction definition DSL #101511

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90c363d
RERAISE
iritkatriel Feb 1, 2023
c861af5
CLEANUP_THROW
iritkatriel Feb 1, 2023
df2e964
Merge branch 'main' into exceptions
iritkatriel Feb 1, 2023
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28 changes: 11 additions & 17 deletions Python/bytecodes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -739,10 +739,10 @@ dummy_func(
Py_XSETREF(exc_info->exc_value, exc_value);
}

// stack effect: (__0 -- )
inst(RERAISE) {
inst(RERAISE, (values[oparg], exc -- values[oparg])) {
assert(oparg >= 0 && oparg <= 2);
if (oparg) {
PyObject *lasti = PEEK(oparg + 1);
PyObject *lasti = values[0];
if (PyLong_Check(lasti)) {
frame->prev_instr = _PyCode_CODE(frame->f_code) + PyLong_AsLong(lasti);
assert(!_PyErr_Occurred(tstate));
Expand All @@ -753,11 +753,11 @@ dummy_func(
goto error;
}
}
PyObject *val = POP();
assert(val && PyExceptionInstance_Check(val));
PyObject *exc = Py_NewRef(PyExceptionInstance_Class(val));
PyObject *tb = PyException_GetTraceback(val);
_PyErr_Restore(tstate, exc, val, tb);
assert(exc && PyExceptionInstance_Check(exc));
Py_INCREF(exc);

gvanrossum Feb 2, 2023

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Subtle: this is needed because it stays on the stack when we goto exception_unwind, so the latter will POP and DECREF it.
PyObject *typ = Py_NewRef(PyExceptionInstance_Class(exc));
PyObject *tb = PyException_GetTraceback(exc);
_PyErr_Restore(tstate, typ, exc, tb);
goto exception_unwind;
}

Expand All @@ -784,18 +784,12 @@ dummy_func(
}
}

// stack effect: (__0, __1 -- )
inst(CLEANUP_THROW) {
inst(CLEANUP_THROW, (sub_iter, last_sent_val, exc_value -- value)) {
assert(throwflag);
PyObject *exc_value = TOP();
assert(exc_value && PyExceptionInstance_Check(exc_value));
if (PyErr_GivenExceptionMatches(exc_value, PyExc_StopIteration)) {
PyObject *value = ((PyStopIterationObject *)exc_value)->value;
Py_INCREF(value);
Py_DECREF(POP()); // The StopIteration.
Py_DECREF(POP()); // The last sent value.
Py_DECREF(POP()); // The delegated sub-iterator.
PUSH(value);
value = Py_NewRef(((PyStopIterationObject *)exc_value)->value);
DECREF_INPUTS();
}
else {
PyObject *exc_type = Py_NewRef(Py_TYPE(exc_value));
Expand Down
32 changes: 19 additions & 13 deletions Python/generated_cases.c.h
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8 changes: 4 additions & 4 deletions Python/opcode_metadata.h
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Original file line number Diff line number Diff line change
Expand Up @@ -105,13 +105,13 @@ _PyOpcode_num_popped(int opcode, int oparg, bool jump) {
case POP_EXCEPT:
return 1;
case RERAISE:
return -1;
return oparg + 1;
case PREP_RERAISE_STAR:
return 2;
case END_ASYNC_FOR:
return 2;
case CLEANUP_THROW:
return -1;
return 3;
case LOAD_ASSERTION_ERROR:
return 0;
case LOAD_BUILD_CLASS:
Expand Down Expand Up @@ -451,13 +451,13 @@ _PyOpcode_num_pushed(int opcode, int oparg, bool jump) {
case POP_EXCEPT:
return 0;
case RERAISE:
return -1;
return oparg;
case PREP_RERAISE_STAR:
return 1;
case END_ASYNC_FOR:
return 0;
case CLEANUP_THROW:
return -1;
return 1;
case LOAD_ASSERTION_ERROR:
return 1;
case LOAD_BUILD_CLASS:
Expand Down
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