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GH-100982: Restrict FOR_ITER_RANGE to a single instruction to allow instrumentation. (GH-101985)

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Mark Shannon 2023-02-22 11:11:57 +00:00 • committed by GitHub
parent 8d46c7ed5e
commit 7c106a443f
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4 changed files with 22 additions and 30 deletions
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22
Python/generated_cases.c.h generated
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@ -2756,28 +2756,28 @@
TARGET(FOR_ITER_RANGE) {
PyObject *iter = PEEK(1);
PyObject *next;
assert(cframe.use_tracing == 0);
_PyRangeIterObject *r = (_PyRangeIterObject *)iter;
DEOPT_IF(Py_TYPE(r) != &PyRangeIter_Type, FOR_ITER);
STAT_INC(FOR_ITER, hit);
_Py_CODEUNIT next = next_instr[INLINE_CACHE_ENTRIES_FOR_ITER];
assert(_PyOpcode_Deopt[next.op.code] == STORE_FAST);
if (r->len <= 0) {
STACK_SHRINK(1);
Py_DECREF(r);
// Jump over END_FOR instruction.
JUMPBY(INLINE_CACHE_ENTRIES_FOR_ITER + oparg + 1);
DISPATCH();
}
else {
long value = r->start;
r->start = value + r->step;
r->len--;
if (_PyLong_AssignValue(&GETLOCAL(next.op.arg), value) < 0) {
goto error;
}
// The STORE_FAST is already done.
JUMPBY(INLINE_CACHE_ENTRIES_FOR_ITER + 1);
long value = r->start;
r->start = value + r->step;
r->len--;
next = PyLong_FromLong(value);
if (next == NULL) {
goto error;
}
STACK_GROW(1);
POKE(1, next);
JUMPBY(1);
DISPATCH();
}