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gh-107265: Fix code_richcompare for ENTER_EXECUTOR case #108165

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Merged
corona10 merged 4 commits into from
Aug 21, 2023
Merged

gh-107265: Fix code_richcompare for ENTER_EXECUTOR case #108165

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e38c553
gh-107265: Fix code_richcompare to lookup actual opcode when ENTER_EX…
corona10 Aug 20, 2023
25d3f5b
Merge remote-tracking branch 'upstream/main' into gh-107265
corona10 Aug 20, 2023
fb0ab4e
Add test and compare oparg too
corona10 Aug 21, 2023
70a29b9
Merge remote-tracking branch 'upstream/main' into gh-107265
corona10 Aug 21, 2023
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Add test and compare oparg too
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@corona10
corona10 committed Aug 21, 2023
commit fb0ab4e4f329933d15d4e1b5f938296de9b19f5c
11 changes: 11 additions & 0 deletions Lib/test/test_capi/test_misc.py
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Expand Up @@ -2341,6 +2341,17 @@ def long_loop():
long_loop()
self.assertEqual(opt.get_count(), 10)

def test_code_richcompare(self):
def testfunc(x):
i = 0
while i < x:
i += 1

opt = _testinternalcapi.get_counter_optimizer()
with temporary_optimizer(opt):
testfunc(1000)
self.assertEqual(testfunc.__code__, testfunc.__code__.replace())


def get_first_executor(func):
code = func.__code__
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2 changes: 2 additions & 0 deletions Objects/codeobject.c
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Expand Up @@ -1786,6 +1786,7 @@ code_richcompare(PyObject *self, PyObject *other, int op)
const int exec_index = co_instr.op.arg;
_PyExecutorObject *exec = co->co_executors->executors[exec_index];
co_instr.op.code = exec->vm_data.opcode;

@markshannon markshannon Aug 21, 2023

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Comparing two code objects must not modify the code object.

The interaction between executor, the specializer and instrumentation is subtle and likely to break without care.
This will leak executors, as it flip-flops between JUMP_BACKWARDS and ENTER_EXECUTOR, or worse if an optimizer assumes that a single instruction will only be seen once.

co_instr.op.arg = exec->vm_data.oparg;
}
assert(co_instr.op.code != ENTER_EXECUTOR);
co_instr.op.code = _PyOpcode_Deopt[co_instr.op.code];
Expand All @@ -1794,6 +1795,7 @@ code_richcompare(PyObject *self, PyObject *other, int op)
const int exec_index = cp_instr.op.arg;
_PyExecutorObject *exec = cp->co_executors->executors[exec_index];
cp_instr.op.code = exec->vm_data.opcode;

@markshannon markshannon Aug 21, 2023

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Likewise

cp_instr.op.arg = exec->vm_data.oparg;
}
assert(cp_instr.op.code != ENTER_EXECUTOR);
cp_instr.op.code = _PyOpcode_Deopt[cp_instr.op.code];
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