1 #include "Python.h"
2
3 #include "pycore_ceval.h"
4 #include "pycore_frame.h"
5 #include "pycore_jit.h"
6
7 // This is where the calling convention changes, on platforms that require it.
8 // The actual change is patched in while the JIT compiler is being built, in
9 // Tools/jit/_targets.py. On other platforms, this function compiles to nothing.
10 _Py_CODEUNIT *
_ENTRY(_PyInterpreterFrame * frame,PyObject ** stack_pointer,PyThreadState * tstate)11 _ENTRY(_PyInterpreterFrame *frame, PyObject **stack_pointer, PyThreadState *tstate)
12 {
13 // This is subtle. The actual trace will return to us once it exits, so we
14 // need to make sure that we stay alive until then. If our trace side-exits
15 // into another trace, and this trace is then invalidated, the code for
16 // *this function* will be freed and we'll crash upon return:
17 PyAPI_DATA(void) _JIT_EXECUTOR;
18 PyObject *executor = (PyObject *)(uintptr_t)&_JIT_EXECUTOR;
19 Py_INCREF(executor);
20 // Note that this is *not* a tail call:
21 PyAPI_DATA(void) _JIT_CONTINUE;
22 _Py_CODEUNIT *target = ((jit_func)&_JIT_CONTINUE)(frame, stack_pointer, tstate);
23 Py_SETREF(tstate->previous_executor, executor);
24 return target;
25 }
26