New submission from Matt Page <mp...@cs.stanford.edu>:
CPython extensions providing optimized execution of Python bytecode (e.g. the
Cinder JIT) may need to hook into the lifecycle of function objects to
determine what to optimize, invalidate previously-optimized functions, or free
resources allocated for functions that no longer exist. For example, when
inlining a function, the Cinder JIT will use the bytecode of the inlined
function that was known at compile-time. If the bytecode for the inlined
function changes at runtime (i.e. if __code__ was reassigned) the JIT needs to
invalidate any code into which the function was inlined. We propose adding an
API to allow extensions to set callbacks that will be invoked whenever
functions are created, modified, or destroyed.
Proposed API:
```
typedef enum {
PYFUNC_LCEVT_CREATED,
PYFUNC_LCEVT_MODIFIED,
PYFUNC_LCEVT_DESTROYED
} PyFunction_LifecycleEvent;
typedef enum {
PYFUNC_ATTR_CODE,
PYFUNC_ATTR_GLOBALS,
PYFUNC_ATTR_DEFAULTS,
PYFUNC_ATTR_KWDEFAULTS,
PYFUNC_ATTR_CLOSURE,
PYFUNC_ATTR_NOT_APPLICABLE,
} PyFunction_AttrId;
// A callback to be called in response to events in a function's lifecycle.
//
// The callback is invoked after a function is created and before the function
// is modified or destroyed.
//
// On modification the third argument indicates which attribute was modified
// and the fourth argument is the new value.
// Otherwise the third argument is PYFUNC_ATTR_NOT_APPLICABLE and the fourth
// argument is NULL.
typedef void(*PyFunction_LifecycleCallback)(
PyFunction_LifecycleEvent event,
PyFunctionObject* func,
PyFunction_AttrId attr,
PyObject* new_value);
void PyFunction_SetLifecycleCallback(PyFunction_LifecycleCallback callback);
PyFunction_LifecycleCallback PyFunction_GetLifecycleCallback();
```
----------
components: C API
messages: 414308
nosy: carljm, dino.viehland, itamaro, mpage
priority: normal
severity: normal
status: open
title: Add API to allow extensions to set callback function on creation,
modification, and destruction of PyFunctionObject
type: enhancement
versions: Python 3.11
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46897>
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