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GH-118093: Add tier two support for BINARY_OP_INPLACE_ADD_UNICODE (GH-122253)

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Brandt Bucher 2024-07-25 14:45:07 -07:00 • committed by GitHub
parent 1d607fe759
commit d9efa45d74
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8 changed files with 241 additions and 153 deletions
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49
Python/executor_cases.c.h generated
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@ -693,6 +693,55 @@
break;
}
case _BINARY_OP_INPLACE_ADD_UNICODE: {
_PyStackRef right;
_PyStackRef left;
right = stack_pointer[-1];
left = stack_pointer[-2];
PyObject *left_o = PyStackRef_AsPyObjectBorrow(left);
PyObject *right_o = PyStackRef_AsPyObjectBorrow(right);
int next_oparg;
#if TIER_ONE
assert(next_instr->op.code == STORE_FAST);
next_oparg = next_instr->op.arg;
#else
next_oparg = CURRENT_OPERAND();
#endif
_PyStackRef *target_local = &GETLOCAL(next_oparg);
if (!PyStackRef_Is(*target_local, left)) {
UOP_STAT_INC(uopcode, miss);
JUMP_TO_JUMP_TARGET();
}
STAT_INC(BINARY_OP, hit);
/* Handle `left = left + right` or `left += right` for str.
*
* When possible, extend `left` in place rather than
* allocating a new PyUnicodeObject. This attempts to avoid
* quadratic behavior when one neglects to use str.join().
*
* If `left` has only two references remaining (one from
* the stack, one in the locals), DECREFing `left` leaves
* only the locals reference, so PyUnicode_Append knows
* that the string is safe to mutate.
*/
assert(Py_REFCNT(left_o) >= 2);
_Py_DECREF_NO_DEALLOC(left_o);
PyObject *temp = PyStackRef_AsPyObjectBorrow(*target_local);
PyUnicode_Append(&temp, right_o);
*target_local = PyStackRef_FromPyObjectSteal(temp);
_Py_DECREF_SPECIALIZED(right_o, _PyUnicode_ExactDealloc);
if (PyStackRef_IsNull(*target_local)) JUMP_TO_ERROR();
#if TIER_ONE
// The STORE_FAST is already done. This is done here in tier one,
// and during trace projection in tier two:
assert(next_instr->op.code == STORE_FAST);
SKIP_OVER(1);
#endif
stack_pointer += -2;
assert(WITHIN_STACK_BOUNDS());
break;
}
case _BINARY_SUBSCR: {
_PyStackRef sub;
_PyStackRef container;