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89a39461bf
exposed in header files. Fixed a few comments in these headers. As we might have expected, writing down invariants systematically exposed a (minor) bug. In this case, function objects have a writeable func_code attribute, which could be set to code objects with the wrong number of free variables. Calling the resulting function segfaulted the interpreter. Added a corresponding test.
76 lines
2.9 KiB
C
76 lines
2.9 KiB
C
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/* Function object interface */
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#ifndef Py_FUNCOBJECT_H
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#define Py_FUNCOBJECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Function objects and code objects should not be confused with each other:
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*
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* Function objects are created by the execution of the 'def' statement.
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* They reference a code object in their func_code attribute, which is a
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* purely syntactic object, i.e. nothing more than a compiled version of some
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* source code lines. There is one code object per source code "fragment",
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* but each code object can be referenced by zero or many function objects
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* depending only on how many times the 'def' statement in the source was
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* executed so far.
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*/
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typedef struct {
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PyObject_HEAD
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PyObject *func_code; /* A code object */
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PyObject *func_globals; /* A dictionary (other mappings won't do) */
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PyObject *func_defaults; /* NULL or a tuple */
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PyObject *func_closure; /* NULL or a tuple of cell objects */
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PyObject *func_doc; /* The __doc__ attribute, can be anything */
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PyObject *func_name; /* The __name__ attribute, a string object */
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PyObject *func_dict; /* The __dict__ attribute, a dict or NULL */
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PyObject *func_weakreflist; /* List of weak references */
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PyObject *func_module; /* The __module__ attribute, can be anything */
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/* Invariant:
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* func_closure contains the bindings for func_code->co_freevars, so
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* PyTuple_Size(func_closure) == PyCode_GetNumFree(func_code)
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* (func_closure may be NULL if PyCode_GetNumFree(func_code) == 0).
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*/
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} PyFunctionObject;
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PyAPI_DATA(PyTypeObject) PyFunction_Type;
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#define PyFunction_Check(op) ((op)->ob_type == &PyFunction_Type)
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PyAPI_FUNC(PyObject *) PyFunction_New(PyObject *, PyObject *);
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PyAPI_FUNC(PyObject *) PyFunction_GetCode(PyObject *);
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PyAPI_FUNC(PyObject *) PyFunction_GetGlobals(PyObject *);
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PyAPI_FUNC(PyObject *) PyFunction_GetModule(PyObject *);
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PyAPI_FUNC(PyObject *) PyFunction_GetDefaults(PyObject *);
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PyAPI_FUNC(int) PyFunction_SetDefaults(PyObject *, PyObject *);
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PyAPI_FUNC(PyObject *) PyFunction_GetClosure(PyObject *);
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PyAPI_FUNC(int) PyFunction_SetClosure(PyObject *, PyObject *);
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/* Macros for direct access to these values. Type checks are *not*
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done, so use with care. */
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#define PyFunction_GET_CODE(func) \
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(((PyFunctionObject *)func) -> func_code)
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#define PyFunction_GET_GLOBALS(func) \
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(((PyFunctionObject *)func) -> func_globals)
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#define PyFunction_GET_MODULE(func) \
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(((PyFunctionObject *)func) -> func_module)
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#define PyFunction_GET_DEFAULTS(func) \
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(((PyFunctionObject *)func) -> func_defaults)
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#define PyFunction_GET_CLOSURE(func) \
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(((PyFunctionObject *)func) -> func_closure)
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/* The classmethod and staticmethod types lives here, too */
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PyAPI_DATA(PyTypeObject) PyClassMethod_Type;
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PyAPI_DATA(PyTypeObject) PyStaticMethod_Type;
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PyAPI_FUNC(PyObject *) PyClassMethod_New(PyObject *);
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PyAPI_FUNC(PyObject *) PyStaticMethod_New(PyObject *);
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_FUNCOBJECT_H */
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