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af68c874a6
In C++, it's an error to pass a string literal to a char* function without a const_cast(). Rather than require every C++ extension module to put a cast around string literals, fix the API to state the const-ness. I focused on parts of the API where people usually pass literals: PyArg_ParseTuple() and friends, Py_BuildValue(), PyMethodDef, the type slots, etc. Predictably, there were a large set of functions that needed to be fixed as a result of these changes. The most pervasive change was to make the keyword args list passed to PyArg_ParseTupleAndKewords() to be a const char *kwlist[]. One cast was required as a result of the changes: A type object mallocs the memory for its tp_doc slot and later frees it. PyTypeObject says that tp_doc is const char *; but if the type was created by type_new(), we know it is safe to cast to char *.
91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
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/* Method object interface */
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#ifndef Py_METHODOBJECT_H
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#define Py_METHODOBJECT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* This is about the type 'builtin_function_or_method',
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not Python methods in user-defined classes. See classobject.h
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for the latter. */
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PyAPI_DATA(PyTypeObject) PyCFunction_Type;
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#define PyCFunction_Check(op) ((op)->ob_type == &PyCFunction_Type)
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typedef PyObject *(*PyCFunction)(PyObject *, PyObject *);
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typedef PyObject *(*PyCFunctionWithKeywords)(PyObject *, PyObject *,
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PyObject *);
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typedef PyObject *(*PyNoArgsFunction)(PyObject *);
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PyAPI_FUNC(PyCFunction) PyCFunction_GetFunction(PyObject *);
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PyAPI_FUNC(PyObject *) PyCFunction_GetSelf(PyObject *);
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PyAPI_FUNC(int) PyCFunction_GetFlags(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 PyCFunction_GET_FUNCTION(func) \
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(((PyCFunctionObject *)func) -> m_ml -> ml_meth)
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#define PyCFunction_GET_SELF(func) \
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(((PyCFunctionObject *)func) -> m_self)
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#define PyCFunction_GET_FLAGS(func) \
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(((PyCFunctionObject *)func) -> m_ml -> ml_flags)
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PyAPI_FUNC(PyObject *) PyCFunction_Call(PyObject *, PyObject *, PyObject *);
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struct PyMethodDef {
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const char *ml_name; /* The name of the built-in function/method */
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PyCFunction ml_meth; /* The C function that implements it */
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int ml_flags; /* Combination of METH_xxx flags, which mostly
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describe the args expected by the C func */
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const char *ml_doc; /* The __doc__ attribute, or NULL */
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};
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typedef struct PyMethodDef PyMethodDef;
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PyAPI_FUNC(PyObject *) Py_FindMethod(PyMethodDef[], PyObject *, const char *);
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#define PyCFunction_New(ML, SELF) PyCFunction_NewEx((ML), (SELF), NULL)
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PyAPI_FUNC(PyObject *) PyCFunction_NewEx(PyMethodDef *, PyObject *,
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PyObject *);
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/* Flag passed to newmethodobject */
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#define METH_OLDARGS 0x0000
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#define METH_VARARGS 0x0001
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#define METH_KEYWORDS 0x0002
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/* METH_NOARGS and METH_O must not be combined with the flags above. */
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#define METH_NOARGS 0x0004
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#define METH_O 0x0008
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/* METH_CLASS and METH_STATIC are a little different; these control
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the construction of methods for a class. These cannot be used for
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functions in modules. */
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#define METH_CLASS 0x0010
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#define METH_STATIC 0x0020
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/* METH_COEXIST allows a method to be entered eventhough a slot has
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already filled the entry. When defined, the flag allows a separate
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method, "__contains__" for example, to coexist with a defined
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slot like sq_contains. */
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#define METH_COEXIST 0x0040
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typedef struct PyMethodChain {
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PyMethodDef *methods; /* Methods of this type */
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struct PyMethodChain *link; /* NULL or base type */
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} PyMethodChain;
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PyAPI_FUNC(PyObject *) Py_FindMethodInChain(PyMethodChain *, PyObject *,
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const char *);
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typedef struct {
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PyObject_HEAD
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PyMethodDef *m_ml; /* Description of the C function to call */
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PyObject *m_self; /* Passed as 'self' arg to the C func, can be NULL */
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PyObject *m_module; /* The __module__ attribute, can be anything */
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} PyCFunctionObject;
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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_METHODOBJECT_H */
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