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gh-115999: Implement thread-local bytecode and enable specialization for BINARY_OP (#123926)

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Each thread specializes a thread-local copy of the bytecode, created on the first RESUME, in free-threaded builds. All copies of the bytecode for a code object are stored in the co_tlbc array on the code object. Threads reserve a globally unique index identifying its copy of the bytecode in all co_tlbc arrays at thread creation and release the index at thread destruction. The first entry in every co_tlbc array always points to the "main" copy of the bytecode that is stored at the end of the code object. This ensures that no bytecode is copied for programs that do not use threads.

Thread-local bytecode can be disabled at runtime by providing either -X tlbc=0 or PYTHON_TLBC=0. Disabling thread-local bytecode also disables specialization.

Concurrent modifications to the bytecode made by the specializing interpreter and instrumentation use atomics, with specialization taking care not to overwrite an instruction that was instrumented concurrently.
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mpage 2024-11-04 11:13:32 -08:00 • committed by GitHub
parent e5a4b402ae
commit 2e95c5ba3b
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GPG key ID: B5690EEEBB952194
44 changed files with 1510 additions and 255 deletions
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23
Python/ceval.c
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@ -189,7 +189,7 @@ lltrace_instruction(_PyInterpreterFrame *frame,
dump_stack(frame, stack_pointer);
const char *opname = _PyOpcode_OpName[opcode];
assert(opname != NULL);
int offset = (int)(next_instr - _PyCode_CODE(_PyFrame_GetCode(frame)));
int offset = (int)(next_instr - _PyFrame_GetBytecode(frame));
if (OPCODE_HAS_ARG((int)_PyOpcode_Deopt[opcode])) {
printf("%d: %s %d\n", offset * 2, opname, oparg);
}
@ -841,6 +841,19 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
}
/* Because this avoids the RESUME,
* we need to update instrumentation */
#ifdef Py_GIL_DISABLED
/* Load thread-local bytecode */
if (frame->tlbc_index != ((_PyThreadStateImpl *)tstate)->tlbc_index) {
_Py_CODEUNIT *bytecode =
_PyEval_GetExecutableCode(tstate, _PyFrame_GetCode(frame));
if (bytecode == NULL) {
goto error;
}
ptrdiff_t off = frame->instr_ptr - _PyFrame_GetBytecode(frame);
frame->tlbc_index = ((_PyThreadStateImpl *)tstate)->tlbc_index;
frame->instr_ptr = bytecode + off;
}
#endif
_Py_Instrument(_PyFrame_GetCode(frame), tstate->interp);
monitor_throw(tstate, frame, frame->instr_ptr);
/* TO DO -- Monitor throw entry. */
@ -983,7 +996,7 @@ exception_unwind:
Python main loop. */
PyObject *exc = _PyErr_GetRaisedException(tstate);
PUSH(PyStackRef_FromPyObjectSteal(exc));
next_instr = _PyCode_CODE(_PyFrame_GetCode(frame)) + handler;
next_instr = _PyFrame_GetBytecode(frame) + handler;
if (monitor_handled(tstate, frame, next_instr, exc) < 0) {
goto exception_unwind;
@ -1045,6 +1058,8 @@ enter_tier_two:
#undef ENABLE_SPECIALIZATION
#define ENABLE_SPECIALIZATION 0
#undef ENABLE_SPECIALIZATION_FT
#define ENABLE_SPECIALIZATION_FT 0
#ifdef Py_DEBUG
#define DPRINTF(level, ...) \
@ -1139,7 +1154,7 @@ exit_to_tier1_dynamic:
goto goto_to_tier1;
exit_to_tier1:
assert(next_uop[-1].format == UOP_FORMAT_TARGET);
next_instr = next_uop[-1].target + _PyCode_CODE(_PyFrame_GetCode(frame));
next_instr = next_uop[-1].target + _PyFrame_GetBytecode(frame);
goto_to_tier1:
#ifdef Py_DEBUG
if (lltrace >= 2) {
@ -1764,7 +1779,7 @@ _PyEvalFramePushAndInit(PyThreadState *tstate, _PyStackRef func,
if (frame == NULL) {
goto fail;
}
_PyFrame_Initialize(frame, func, locals, code, 0, previous);
_PyFrame_Initialize(tstate, frame, func, locals, code, 0, previous);
if (initialize_locals(tstate, func_obj, frame->localsplus, args, argcount, kwnames)) {
assert(frame->owner == FRAME_OWNED_BY_THREAD);
clear_thread_frame(tstate, frame);