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Provide __module__ attributes for functions defined in C and Python.

Browse source 
__module__ is the string name of the module the function was defined
in, just like __module__ of classes.  In some cases, particularly for
C functions, the __module__ may be None.

Change PyCFunction_New() from a function to a macro, but keep an
unused copy of the function around so that we don't change the binary
API.

Change pickle's save_global() to use whichmodule() if __module__ is
None, but add the __module__ logic to whichmodule() since it might be
used outside of pickle.
This commit is contained in:
Jeremy Hylton 2003-01-31 18:33:18 +00:00
parent 8f24cdc0d5
commit 4f0dcc9a9a
8 changed files with 114 additions and 18 deletions
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4
Include/funcobject.h
View file

@ -17,6 +17,7 @@ typedef struct {
PyObject *func_name;
PyObject *func_dict;
PyObject *func_weakreflist;
PyObject *func_module;
} PyFunctionObject;
PyAPI_DATA(PyTypeObject) PyFunction_Type;
@ -26,6 +27,7 @@ PyAPI_DATA(PyTypeObject) PyFunction_Type;
PyAPI_FUNC(PyObject *) PyFunction_New(PyObject *, PyObject *);
PyAPI_FUNC(PyObject *) PyFunction_GetCode(PyObject *);
PyAPI_FUNC(PyObject *) PyFunction_GetGlobals(PyObject *);
PyAPI_FUNC(PyObject *) PyFunction_GetModule(PyObject *);
PyAPI_FUNC(PyObject *) PyFunction_GetDefaults(PyObject *);
PyAPI_FUNC(int) PyFunction_SetDefaults(PyObject *, PyObject *);
PyAPI_FUNC(PyObject *) PyFunction_GetClosure(PyObject *);
@ -37,6 +39,8 @@ PyAPI_FUNC(int) PyFunction_SetClosure(PyObject *, PyObject *);
(((PyFunctionObject *)func) -> func_code)
#define PyFunction_GET_GLOBALS(func) \
(((PyFunctionObject *)func) -> func_globals)
#define PyFunction_GET_MODULE(func) \
(((PyFunctionObject *)func) -> func_module)
#define PyFunction_GET_DEFAULTS(func) \
(((PyFunctionObject *)func) -> func_defaults)
#define PyFunction_GET_CLOSURE(func) \

5
Include/methodobject.h
View file

@ -40,7 +40,9 @@ typedef struct PyMethodDef PyMethodDef;
PyAPI_FUNC(PyObject *) Py_FindMethod(PyMethodDef[], PyObject *, char *);
PyAPI_FUNC(PyObject *) PyCFunction_New(PyMethodDef *, PyObject *);
#define PyCFunction_New(ML, SELF) PyCFunction_NewEx((ML), (SELF), NULL)
PyAPI_FUNC(PyObject *) PyCFunction_NewEx(PyMethodDef *, PyObject *,
PyObject *);
/* Flag passed to newmethodobject */
#define METH_OLDARGS 0x0000
@ -68,6 +70,7 @@ typedef struct {
PyObject_HEAD
PyMethodDef *m_ml;
PyObject *m_self;
PyObject *m_module;
} PyCFunctionObject;
#ifdef __cplusplus

9
Lib/pickle.py
View file

@ -787,9 +787,8 @@ def save_global(self, obj, name=None, pack=struct.pack):
if name is None:
name = obj.__name__
try:
module = obj.__module__
except AttributeError:
module = getattr(obj, "__module__", None)
if module is None:
module = whichmodule(obj, name)
try:
@ -876,6 +875,10 @@ def whichmodule(func, funcname):
Return a module name.
If the function cannot be found, return "__main__".
"""
# Python functions should always get an __module__ from their globals.
mod = getattr(func, "__module__", None)
if mod is not None:
return mod
if func in classmap:
return classmap[func]

4
Lib/test/test_funcattrs.py
View file

@ -9,6 +9,10 @@ def b():
'my docstring'
pass
# __module__ is a special attribute
verify(b.__module__ == __name__)
verify(verify.__module__ == "test.test_support")
# setting attributes on functions
try:
b.publish

28
Objects/funcobject.c
View file

@ -14,6 +14,7 @@ PyFunction_New(PyObject *code, PyObject *globals)
if (op != NULL) {
PyObject *doc;
PyObject *consts;
PyObject *module;
op->func_weakreflist = NULL;
Py_INCREF(code);
op->func_code = code;
@ -34,6 +35,16 @@ PyFunction_New(PyObject *code, PyObject *globals)
Py_INCREF(doc);
op->func_doc = doc;
op->func_dict = NULL;
op->func_module = NULL;
/* __module__: If module name is in globals, use it.
Otherwise, use None.
*/
module = PyDict_GetItemString(globals, "__name__");
if (module) {
Py_INCREF(module);
op->func_module = module;
}
}
else
return NULL;
@ -61,6 +72,16 @@ PyFunction_GetGlobals(PyObject *op)
return ((PyFunctionObject *) op) -> func_globals;
}
PyObject *
PyFunction_GetModule(PyObject *op)
{
if (!PyFunction_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return ((PyFunctionObject *) op) -> func_module;
}
PyObject *
PyFunction_GetDefaults(PyObject *op)
{
@ -138,6 +159,7 @@ static PyMemberDef func_memberlist[] = {
RESTRICTED|READONLY},
{"func_name", T_OBJECT, OFF(func_name), READONLY},
{"__name__", T_OBJECT, OFF(func_name), READONLY},
{"__module__", T_OBJECT, OFF(func_module), READONLY},
{NULL} /* Sentinel */
};
@ -373,6 +395,7 @@ func_dealloc(PyFunctionObject *op)
PyObject_ClearWeakRefs((PyObject *) op);
Py_DECREF(op->func_code);
Py_DECREF(op->func_globals);
Py_XDECREF(op->func_module);
Py_DECREF(op->func_name);
Py_XDECREF(op->func_defaults);
Py_XDECREF(op->func_doc);
@ -405,6 +428,11 @@ func_traverse(PyFunctionObject *f, visitproc visit, void *arg)
if (err)
return err;
}
if (f->func_module) {
err = visit(f->func_module, arg);
if (err)
return err;
}
if (f->func_defaults) {
err = visit(f->func_defaults, arg);
if (err)

46
Objects/methodobject.c
View file

@ -2,11 +2,12 @@
/* Method object implementation */
#include "Python.h"
#include "structmember.h"
static PyCFunctionObject *free_list = NULL;
PyObject *
PyCFunction_New(PyMethodDef *ml, PyObject *self)
PyCFunction_NewEx(PyMethodDef *ml, PyObject *self, PyObject *module)
{
PyCFunctionObject *op;
op = free_list;
@ -22,6 +23,8 @@ PyCFunction_New(PyMethodDef *ml, PyObject *self)
op->m_ml = ml;
Py_XINCREF(self);
op->m_self = self;
Py_XINCREF(module);
op->m_module = module;
_PyObject_GC_TRACK(op);
return (PyObject *)op;
}
@ -121,6 +124,7 @@ meth_dealloc(PyCFunctionObject *m)
{
_PyObject_GC_UNTRACK(m);
Py_XDECREF(m->m_self);
Py_XDECREF(m->m_module);
m->m_self = (PyObject *)free_list;
free_list = m;
}
@ -145,10 +149,18 @@ meth_get__name__(PyCFunctionObject *m, void *closure)
static int
meth_traverse(PyCFunctionObject *m, visitproc visit, void *arg)
{
if (m->m_self != NULL)
return visit(m->m_self, arg);
else
return 0;
int err;
if (m->m_self != NULL) {
err = visit(m->m_self, arg);
if (err)
return err;
}
if (m->m_module != NULL) {
err = visit(m->m_module, arg);
if (err)
return err;
}
return 0;
}
static PyObject *
@ -174,6 +186,13 @@ static PyGetSetDef meth_getsets [] = {
{0}
};
#define OFF(x) offsetof(PyCFunctionObject, x)
static PyMemberDef meth_members[] = {
{"__module__", T_OBJECT, OFF(m_module), READONLY},
{NULL}
};
static PyObject *
meth_repr(PyCFunctionObject *m)
{
@ -250,7 +269,7 @@ PyTypeObject PyCFunction_Type = {
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
meth_members, /* tp_members */
meth_getsets, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
@ -308,6 +327,7 @@ Py_FindMethodInChain(PyMethodChain *chain, PyObject *self, char *name)
for (; ml->ml_name != NULL; ml++) {
if (name[0] == ml->ml_name[0] &&
strcmp(name+1, ml->ml_name+1) == 0)
/* XXX */
return PyCFunction_New(ml, self);
}
chain = chain->link;
@ -338,3 +358,17 @@ PyCFunction_Fini(void)
PyObject_GC_Del(v);
}
}
/* PyCFunction_New() is now just a macro that calls PyCFunction_NewEx(),
but it's part of the API so we need to keep a function around that
existing C extensions can call.
*/
#undef PyCFunction_New
PyAPI_FUNC(PyObject *) PyCFunction_New(PyMethodDef *, PyObject *);
PyObject *
PyCFunction_New(PyMethodDef *ml, PyObject *self)
{
return PyCFunction_NewEx(ml, self, NULL);
}

20
Python/exceptions.c
View file

@ -126,22 +126,27 @@ Exception\n\
static int
populate_methods(PyObject *klass, PyObject *dict, PyMethodDef *methods)
{
PyObject *module;
int status = -1;
if (!methods)
return 0;
module = PyString_FromString("exceptions");
if (!module)
return 0;
while (methods->ml_name) {
/* get a wrapper for the built-in function */
PyObject *func = PyCFunction_New(methods, NULL);
PyObject *func = PyCFunction_NewEx(methods, NULL, module);
PyObject *meth;
int status;
if (!func)
return -1;
goto status;
/* turn the function into an unbound method */
if (!(meth = PyMethod_New(func, NULL, klass))) {
Py_DECREF(func);
return -1;
goto status;
}
/* add method to dictionary */
@ -151,11 +156,14 @@ populate_methods(PyObject *klass, PyObject *dict, PyMethodDef *methods)
/* stop now if an error occurred, otherwise do the next method */
if (status)
return status;
goto status;
methods++;
}
return 0;
status = 0;
status:
Py_DECREF(module);
return status;
}

16
Python/modsupport.c
View file

@ -33,7 +33,7 @@ PyObject *
Py_InitModule4(char *name, PyMethodDef *methods, char *doc,
PyObject *passthrough, int module_api_version)
{
PyObject *m, *d, *v;
PyObject *m, *d, *v, *n;
PyMethodDef *ml;
if (!Py_IsInitialized())
Py_FatalError("Interpreter not initialized (version mismatch?)");
@ -46,6 +46,15 @@ Py_InitModule4(char *name, PyMethodDef *methods, char *doc,
if (PyErr_Warn(PyExc_RuntimeWarning, message))
return NULL;
}
/* Make sure name is fully qualified.
This is a bit of a hack: when the shared library is loaded,
the module name is "package.module", but the module calls
Py_InitModule*() with just "module" for the name. The shared
library loader squirrels away the true name of the module in
_Py_PackageContext, and Py_InitModule*() will substitute this
(if the name actually matches).
*/
if (_Py_PackageContext != NULL) {
char *p = strrchr(_Py_PackageContext, '.');
if (p != NULL && strcmp(name, p+1) == 0) {
@ -57,6 +66,9 @@ Py_InitModule4(char *name, PyMethodDef *methods, char *doc,
return NULL;
d = PyModule_GetDict(m);
if (methods != NULL) {
n = PyString_FromString(name);
if (n == NULL)
return NULL;
for (ml = methods; ml->ml_name != NULL; ml++) {
if ((ml->ml_flags & METH_CLASS) ||
(ml->ml_flags & METH_STATIC)) {
@ -65,7 +77,7 @@ Py_InitModule4(char *name, PyMethodDef *methods, char *doc,
" METH_CLASS or METH_STATIC");
return NULL;
}
v = PyCFunction_New(ml, passthrough);
v = PyCFunction_NewEx(ml, passthrough, n);
if (v == NULL)
return NULL;
if (PyDict_SetItemString(d, ml->ml_name, v) != 0) {