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GH-133231: Changes to executor management to support proposed sys._jit module (GH-133287)

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* Track the current executor, not the previous one, on the thread-state. 

* Batch executors for deallocation to avoid having to constantly incref executors; this is an ad-hoc form of deferred reference counting.
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Mark Shannon 2025-05-04 10:05:35 +01:00 • committed by GitHub
parent 1d9406e426
commit ac7d5ba96e
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13 changed files with 176 additions and 54 deletions
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9
Python/ceval_macros.h
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@ -359,12 +359,12 @@ _PyFrame_SetStackPointer(frame, stack_pointer)
do { \
OPT_STAT_INC(traces_executed); \
_PyExecutorObject *_executor = (EXECUTOR); \
tstate->current_executor = (PyObject *)_executor; \
jit_func jitted = _executor->jit_code; \
/* Keep the shim frame alive via the executor: */ \
Py_INCREF(_executor); \
next_instr = jitted(frame, stack_pointer, tstate); \
Py_DECREF(_executor); \
Py_CLEAR(tstate->previous_executor); \
frame = tstate->current_frame; \
stack_pointer = _PyFrame_GetStackPointer(frame); \
if (next_instr == NULL) { \
@ -377,7 +377,9 @@ do { \
#define GOTO_TIER_TWO(EXECUTOR) \
do { \
OPT_STAT_INC(traces_executed); \
next_uop = (EXECUTOR)->trace; \
_PyExecutorObject *_executor = (EXECUTOR); \
tstate->current_executor = (PyObject *)_executor; \
next_uop = _executor->trace; \
assert(next_uop->opcode == _START_EXECUTOR); \
goto enter_tier_two; \
} while (0)
@ -386,10 +388,11 @@ do { \
#define GOTO_TIER_ONE(TARGET) \
do \
{ \
tstate->current_executor = NULL; \
next_instr = (TARGET); \
assert(tstate->current_executor == NULL); \
OPT_HIST(trace_uop_execution_counter, trace_run_length_hist); \
_PyFrame_SetStackPointer(frame, stack_pointer); \
Py_CLEAR(tstate->previous_executor); \
stack_pointer = _PyFrame_GetStackPointer(frame); \
if (next_instr == NULL) \
{ \