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gh-92031: Deoptimize Static Code at Finalization (GH-92039)

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Dennis Sweeney 2022-05-03 10:59:12 -04:00 • committed by GitHub
parent 04dc4b06a3
commit b156578bd6
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5 changed files with 225 additions and 10 deletions
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27
Objects/codeobject.c
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@ -1350,23 +1350,29 @@ _PyCode_GetFreevars(PyCodeObject *co)
return get_localsplus_names(co, CO_FAST_FREE, co->co_nfreevars);
}
PyObject *
_PyCode_GetCode(PyCodeObject *co)
static void
deopt_code(_Py_CODEUNIT *instructions, Py_ssize_t len)
{
PyObject *code = PyBytes_FromStringAndSize(NULL, _PyCode_NBYTES(co));
if (code == NULL) {
return NULL;
}
_Py_CODEUNIT *instructions = (_Py_CODEUNIT *)PyBytes_AS_STRING(code);
for (int i = 0; i < Py_SIZE(co); i++) {
_Py_CODEUNIT instruction = _PyCode_CODE(co)[i];
int opcode = _PyOpcode_Deopt[_Py_OPCODE(instruction)];
for (int i = 0; i < len; i++) {
_Py_CODEUNIT instruction = instructions[i];
int opcode = _PyOpcode_Original[_Py_OPCODE(instruction)];
int caches = _PyOpcode_Caches[opcode];
instructions[i] = _Py_MAKECODEUNIT(opcode, _Py_OPARG(instruction));
while (caches--) {
instructions[++i] = _Py_MAKECODEUNIT(CACHE, 0);
}
}
}
PyObject *
_PyCode_GetCode(PyCodeObject *co)
{
PyObject *code = PyBytes_FromStringAndSize((const char *)_PyCode_CODE(co),
_PyCode_NBYTES(co));
if (code == NULL) {
return NULL;
}
deopt_code((_Py_CODEUNIT *)PyBytes_AS_STRING(code), Py_SIZE(co));
return code;
}
@ -2076,6 +2082,7 @@ _PyStaticCode_Dealloc(PyCodeObject *co)
if (co->co_warmup == 0) {
_Py_QuickenedCount--;
}
deopt_code(_PyCode_CODE(co), Py_SIZE(co));
co->co_warmup = QUICKENING_INITIAL_WARMUP_VALUE;
PyMem_Free(co->co_extra);
co->co_extra = NULL;