8000 GH-136410: Faster side exits by markshannon · Pull Request #136411 · python/cpython · GitHub
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GH-136410: Faster side exits #136411

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GH-136410: Faster side exits #136411

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a281775
Faster side exits.
markshannon Jul 7, 2025
ec7f0e2
Fix copy-and-paste error
markshannon Jul 7, 2025
911520a
Check validity at start of trace
markshannon Jul 7, 2025
73832b2
Tidy up
markshannon Jul 8, 2025
a9297a0
Null test before use
markshannon Jul 8, 2025
47b53d1
Update asserts
markshannon Jul 8, 2025
2564d41
Properly fix assert
markshannon Jul 8, 2025
779bd7d
Don't make object immortal until it is fully initialized
markshannon Jul 8, 2025
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3 changes: 3 additions & 0 deletions Include/cpython/pystate.h
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Original file line number Diff line number Diff line change
Expand Up @@ -198,6 +198,9 @@ struct _ts {

PyObject *current_executor;

/* Internal to the JIT */
struct _PyExitData *jit_exit;

uint64_t dict_global_version;

/* Used to store/retrieve `threading.local` keys/values for this thread */
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1 change: 1 addition & 0 deletions Include/internal/pycore_interp_structs.h
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Expand Up @@ -944,6 +944,7 @@ struct _is {
bool jit;
struct _PyExecutorObject *executor_list_head;
struct _PyExecutorObject *executor_deletion_list_head;
struct _PyExecutorObject *cold_executor;
int executor_deletion_list_remaining_capacity;
size_t trace_run_counter;
_rare_events rare_events;
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11 changes: 10 additions & 1 deletion Include/internal/pycore_optimizer.h
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Expand Up @@ -67,8 +67,9 @@ typedef struct {
#endif
} _PyUOpInstruction;

typedef struct {
typedef struct _PyExitData {
uint32_t target;
uint16_t index;
_Py_BackoffCounter temperature;
struct _PyExecutorObject *executor;
} _PyExitData;
Expand Down Expand Up @@ -354,6 +355,14 @@ PyAPI_FUNC(PyObject *) _Py_uop_symbols_test(PyObject *self, PyObject *ignored);

PyAPI_FUNC(int) _PyOptimizer_Optimize(_PyInterpreterFrame *frame, _Py_CODEUNIT *start, _PyExecutorObject **exec_ptr, int chain_depth);

static inline _PyExecutorObject *_PyExecutor_FromExit(_PyExitData *exit)
{
_PyExitData *exit0 = exit - exit->index;
return (_PyExecutorObject *)(((char *)exit0) - offsetof(_PyExecutorObject, exits));
}

extern _PyExecutorObject *_PyExecutor_GetColdExecutor(void);

static inline int is_terminator(const _PyUOpInstruction *uop)
{
int opcode = uop->opcode;
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