I am building a Python JIT, so I want to change the interp->eval_frame to my
own function.
I built a C++ library which contains EvalFrame function, and then use dlopen
and dlsym to use it. It looks like this:
extern "C" PyObject *EvalFrame(PyFrameObject *f, int throwflag) {
return _PyEval_EvalFrameDefault(f, throwflag);
}
I added following code to Python/pylifecycle.c at function
_Py_InitializeEx_Private(Python version is 3.6.1):
void *pyjit = NULL;
pyjit = dlopen("../cmake-build-debug/libPubbon.dylib", 0);
if (pyjit != NULL) {
interp->eval_frame = (_PyFrameEvalFunction)dlsym(pyjit, "EvalFrame");
//interp->eval_frame = _PyEval_EvalFrameDefault;
}
Then something strange happened. I used LLDB to trace the variables. When it
ran at EvalFrame, the address of f pointer didn't change, but f->f_lineno
changed.
Then when I ran python.exe, I got Segmentation Fault.
Why the address of the pointer didn't change, but the context change?
I am working on Mac OS X and Python 3.6.1. I want to know how to replace
_PyEval_EvalFrameDefault in interp->eval_frame with my own function.
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