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570a82d46a
Changes to the function version cache: - In addition to the function object, also store the code object, and allow the latter to be retrieved even if the function has been evicted. - Stop assigning new function versions after a critical attribute (e.g. `__code__`) has been modified; the version is permanently reset to zero in this case. - Changes to `__annotations__` are no longer considered critical. (This fixes gh-109998.) Changes to the Tier 2 optimization machinery: - If we cannot map a function version to a function, but it is still mapped to a code object, we continue projecting the trace. The operand of the `_PUSH_FRAME` and `_POP_FRAME` opcodes can be either NULL, a function object, or a code object with the lowest bit set. This allows us to trace through code that calls an ephemeral function, i.e., a function that may not be alive when we are constructing the executor, e.g. a generator expression or certain nested functions. We will lose globals removal inside such functions, but we can still do other peephole operations (and even possibly [call inlining](https://github.com/python/cpython/pull/116290), if we decide to do it), which only need the code object. As before, if we cannot retrieve the code object from the cache, we stop projecting.
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
#ifndef Py_INTERNAL_FUNCTION_H
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#define Py_INTERNAL_FUNCTION_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef Py_BUILD_CORE
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# error "this header requires Py_BUILD_CORE define"
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#endif
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extern PyObject* _PyFunction_Vectorcall(
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PyObject *func,
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PyObject *const *stack,
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size_t nargsf,
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PyObject *kwnames);
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#define FUNC_MAX_WATCHERS 8
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#define FUNC_VERSION_CACHE_SIZE (1<<12) /* Must be a power of 2 */
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struct _func_version_cache_item {
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PyFunctionObject *func;
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PyObject *code;
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};
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struct _py_func_state {
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uint32_t next_version;
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// Borrowed references to function and code objects whose
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// func_version % FUNC_VERSION_CACHE_SIZE
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// once was equal to the index in the table.
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// They are cleared when the function or code object is deallocated.
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struct _func_version_cache_item func_version_cache[FUNC_VERSION_CACHE_SIZE];
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};
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extern PyFunctionObject* _PyFunction_FromConstructor(PyFrameConstructor *constr);
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extern uint32_t _PyFunction_GetVersionForCurrentState(PyFunctionObject *func);
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PyAPI_FUNC(void) _PyFunction_SetVersion(PyFunctionObject *func, uint32_t version);
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void _PyFunction_ClearCodeByVersion(uint32_t version);
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PyFunctionObject *_PyFunction_LookupByVersion(uint32_t version, PyObject **p_code);
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extern PyObject *_Py_set_function_type_params(
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PyThreadState* unused, PyObject *func, PyObject *type_params);
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_INTERNAL_FUNCTION_H */
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