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gh-106529: Make FOR_ITER a viable uop (#112134)

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This uses the new mechanism whereby certain uops
are replaced by others during translation,
using the `_PyUop_Replacements` table.
We further special-case the `_FOR_ITER_TIER_TWO` uop
to update the deoptimization target to point
just past the corresponding `END_FOR` opcode.

Two tiny code cleanups are also part of this PR.
This commit is contained in:
Guido van Rossum 2023-11-20 10:08:53 -08:00 • committed by GitHub
parent d59feb5dbe
commit 1995955173
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8 changed files with 138 additions and 43 deletions
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25
Python/executor_cases.c.h generated
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@ -2101,6 +2101,31 @@
break;
}
case _FOR_ITER_TIER_TWO: {
PyObject *iter;
PyObject *next;
iter = stack_pointer[-1];
/* before: [iter]; after: [iter, iter()] *or* [] (and jump over END_FOR.) */
next = (*Py_TYPE(iter)->tp_iternext)(iter);
if (next == NULL) {
if (_PyErr_Occurred(tstate)) {
if (!_PyErr_ExceptionMatches(tstate, PyExc_StopIteration)) {
GOTO_ERROR(error);
}
_PyErr_Clear(tstate);
}
/* iterator ended normally */
Py_DECREF(iter);
STACK_SHRINK(1);
/* The translator sets the deopt target just past END_FOR */
DEOPT_IF(true, _FOR_ITER_TIER_TWO);
}
// Common case: no jump, leave it to the code generator
STACK_GROW(1);
stack_pointer[-1] = next;
break;
}
case _ITER_CHECK_LIST: {
PyObject *iter;
iter = stack_pointer[-1];