Objetos código

Los objetos código son un detalle de bajo nivel de la implementación de CPython. Cada uno representa un fragmento de código ejecutable que aún no se ha vinculado a una función.

type PyCodeObject

La estructura en C de los objetos utilizados para describir objetos código. Los campos de este tipo están sujetos a cambios en cualquier momento.

PyTypeObject PyCode_Type

This is an instance of PyTypeObject representing the Python code object.

int PyCode_Check(PyObject *co)

Return true if co is a code object. This function always succeeds.

Py_ssize_t PyCode_GetNumFree(PyCodeObject *co)

Return the number of free variables in a code object.

int PyCode_GetFirstFree(PyCodeObject *co)

Return the position of the first free variable in a code object.

PyCodeObject *PyUnstable_Code_New(int argcount, int kwonlyargcount, int nlocals, int stacksize, int flags, PyObject *code, PyObject *consts, PyObject *names, PyObject *varnames, PyObject *freevars, PyObject *cellvars, PyObject *filename, PyObject *name, PyObject *qualname, int firstlineno, PyObject *linetable, PyObject *exceptiontable)

This is Unstable API. It may change without warning in minor releases.

Return a new code object. If you need a dummy code object to create a frame, use PyCode_NewEmpty() instead.

Since the definition of the bytecode changes often, calling PyUnstable_Code_New() directly can bind you to a precise Python version.

The many arguments of this function are inter-dependent in complex ways, meaning that subtle changes to values are likely to result in incorrect execution or VM crashes. Use this function only with extreme care.

Distinto en la versión 3.11: Added qualname and exceptiontable parameters.

Distinto en la versión 3.12: Renamed from PyCode_New as part of Unstable C API. The old name is deprecated, but will remain available until the signature changes again.

PyCodeObject *PyUnstable_Code_NewWithPosOnlyArgs(int argcount, int posonlyargcount, int kwonlyargcount, int nlocals, int stacksize, int flags, PyObject *code, PyObject *consts, PyObject *names, PyObject *varnames, PyObject *freevars, PyObject *cellvars, PyObject *filename, PyObject *name, PyObject *qualname, int firstlineno, PyObject *linetable, PyObject *exceptiontable)

This is Unstable API. It may change without warning in minor releases.

Similar to PyUnstable_Code_New(), but with an extra «posonlyargcount» for positional-only arguments. The same caveats that apply to PyUnstable_Code_New also apply to this function.

Nuevo en la versión 3.8: as PyCode_NewWithPosOnlyArgs

Distinto en la versión 3.11: Added qualname and exceptiontable parameters.

Distinto en la versión 3.12: Renamed to PyUnstable_Code_NewWithPosOnlyArgs. The old name is deprecated, but will remain available until the signature changes again.

PyCodeObject *PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)

Return value: New reference.

Retorna un nuevo objeto de código vacío con el nombre de archivo especificado, el nombre de la función y el número de la primera línea. Si el objeto código resultante es ejecutado, lanzará una Exception.

int PyCode_Addr2Line(PyCodeObject *co, int byte_offset)

Retorna el número de línea de la instrucción que se produce en o antes de byte_offset y finaliza después. Si solo necesita el número de línea de un marco, use PyFrame_GetLineNumber() en su lugar.

Para iterar de manera eficiente sobre los números de línea en un objeto de código, use la API descrita en PEP 626.

int PyCode_Addr2Location(PyObject *co, int byte_offset, int *start_line, int *start_column, int *end_line, int *end_column)

Establece los punteros int pasados en los números de línea y columna del código fuente para las instrucciones en byte_offset. Establece el valor en 0 cuando la información no está disponible para algún elemento en particular.

Retorna 1 si la función fue exitosa y 0 de lo contrario.

Nuevo en la versión 3.11.

PyObject *PyCode_GetCode(PyCodeObject *co)

Equivalente al código Python getattr(co, 'co_code'). Retorna una referencia fuerte a un PyBytesObject representando el bytecode en un objecto código. En caso de error se retorna NULL y se lanza una excepción.

Este PyBytesObject puede ser creado a pedido del intérprete y no necesariamente representa el bytecode que es realmente ejecutado por CPython. Los casos de uso principales para esta función son depuradores y perfiladores.

Nuevo en la versión 3.11.

PyObject *PyCode_GetVarnames(PyCodeObject *co)

Equivalente al código Python getattr(co, 'co_varnames'). Retorna una nueva referencia a un PyTupleObject que contiene los nombres de las variables locales. En caso de error, retorna NULL y lanza una excepción.

Nuevo en la versión 3.11.

PyObject *PyCode_GetCellvars(PyCodeObject *co)

Equivalente al código Python getattr(co, 'co_cellvars'). Retorna una nueva referencia a un PyTupleObject que contiene los nombres de las variables locales referenciadas por funciones anidadas. En caso de error, retorna NULL y lanza una excepción.

Nuevo en la versión 3.11.

PyObject *PyCode_GetFreevars(PyCodeObject *co)

Equivalente al código Python getattr(co, 'co_freevars'). Retorna una nueva referencia a un PyTupleObject que contiene los nombres de las variables libres. En caso de error, retorna NULL y lanza una excepción.

Nuevo en la versión 3.11.

int PyCode_AddWatcher(PyCode_WatchCallback callback)

Register callback as a code object watcher for the current interpreter. Return an ID which may be passed to PyCode_ClearWatcher(). In case of error (e.g. no more watcher IDs available), return -1 and set an exception.

Nuevo en la versión 3.12.

int PyCode_ClearWatcher(int watcher_id)

Clear watcher identified by watcher_id previously returned from PyCode_AddWatcher() for the current interpreter. Return 0 on success, or -1 and set an exception on error (e.g. if the given watcher_id was never registered.)

Nuevo en la versión 3.12.

type PyCodeEvent

Enumeration of possible code object watcher events: - PY_CODE_EVENT_CREATE - PY_CODE_EVENT_DESTROY

Nuevo en la versión 3.12.

typedef int (*PyCode_WatchCallback)(PyCodeEvent event, PyCodeObject *co)

Type of a code object watcher callback function.

If event is PY_CODE_EVENT_CREATE, then the callback is invoked after co has been fully initialized. Otherwise, the callback is invoked before the destruction of co takes place, so the prior state of co can be inspected.

If event is PY_CODE_EVENT_DESTROY, taking a reference in the callback to the about-to-be-destroyed code object will resurrect it and prevent it from being freed at this time. When the resurrected object is destroyed later, any watcher callbacks active at that time will be called again.

Users of this API should not rely on internal runtime implementation details. Such details may include, but are not limited to, the exact order and timing of creation and destruction of code objects. While changes in these details may result in differences observable by watchers (including whether a callback is invoked or not), it does not change the semantics of the Python code being executed.

If the callback sets an exception, it must return -1; this exception will be printed as an unraisable exception using PyErr_WriteUnraisable(). Otherwise it should return 0.

There may already be a pending exception set on entry to the callback. In this case, the callback should return 0 with the same exception still set. This means the callback may not call any other API that can set an exception unless it saves and clears the exception state first, and restores it before returning.

Nuevo en la versión 3.12.

Extra information

To support low-level extensions to frame evaluation, such as external just-in-time compilers, it is possible to attach arbitrary extra data to code objects.

These functions are part of the unstable C API tier: this functionality is a CPython implementation detail, and the API may change without deprecation warnings.

Py_ssize_t PyUnstable_Eval_RequestCodeExtraIndex(freefunc free)

This is Unstable API. It may change without warning in minor releases.

Return a new an opaque index value used to adding data to code objects.

You generally call this function once (per interpreter) and use the result with PyCode_GetExtra and PyCode_SetExtra to manipulate data on individual code objects.

If free is not NULL: when a code object is deallocated, free will be called on non-NULL data stored under the new index. Use Py_DecRef() when storing PyObject.

Nuevo en la versión 3.6: as _PyEval_RequestCodeExtraIndex

Distinto en la versión 3.12: Renamed to PyUnstable_Eval_RequestCodeExtraIndex. The old private name is deprecated, but will be available until the API changes.

int PyUnstable_Code_GetExtra(PyObject *code, Py_ssize_t index, void **extra)

This is Unstable API. It may change without warning in minor releases.

Set extra to the extra data stored under the given index. Return 0 on success. Set an exception and return -1 on failure.

If no data was set under the index, set extra to NULL and return 0 without setting an exception.

Nuevo en la versión 3.6: as _PyCode_GetExtra

Distinto en la versión 3.12: Renamed to PyUnstable_Code_GetExtra. The old private name is deprecated, but will be available until the API changes.

int PyUnstable_Code_SetExtra(PyObject *code, Py_ssize_t index, void *extra)

This is Unstable API. It may change without warning in minor releases.

Set the extra data stored under the given index to extra. Return 0 on success. Set an exception and return -1 on failure.

Nuevo en la versión 3.6: as _PyCode_SetExtra

Distinto en la versión 3.12: Renamed to PyUnstable_Code_SetExtra. The old private name is deprecated, but will be available until the API changes.