mirror of https://github.com/python/cpython
26 lines
1.1 KiB
C
26 lines
1.1 KiB
C
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#include "Python.h"
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#include "pycore_ceval.h"
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#include "pycore_frame.h"
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#include "pycore_jit.h"
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// This is where the calling convention changes, on platforms that require it.
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// The actual change is patched in while the JIT compiler is being built, in
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// Tools/jit/_targets.py. On other platforms, this function compiles to nothing.
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_Py_CODEUNIT *
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_ENTRY(_PyInterpreterFrame *frame, PyObject **stack_pointer, PyThreadState *tstate)
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{
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// This is subtle. The actual trace will return to us once it exits, so we
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// need to make sure that we stay alive until then. If our trace side-exits
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// into another trace, and this trace is then invalidated, the code for
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// *this function* will be freed and we'll crash upon return:
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PyAPI_DATA(void) _JIT_EXECUTOR;
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PyObject *executor = (PyObject *)(uintptr_t)&_JIT_EXECUTOR;
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Py_INCREF(executor);
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// Note that this is *not* a tail call:
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PyAPI_DATA(void) _JIT_CONTINUE;
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_Py_CODEUNIT *target = ((jit_func)&_JIT_CONTINUE)(frame, stack_pointer, tstate);
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Py_SETREF(tstate->previous_executor, executor);
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return target;
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}
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