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Revision b3468f79efa45c8adaf86c0b9b797b9b3d4c12a2 authored by Michael Foord on 19 December 2010, 03:19:47 UTC, committed by Michael Foord on 19 December 2010, 03:19:47 UTC
1 parent addc6f5
Tip revision: b3468f79efa45c8adaf86c0b9b797b9b3d4c12a2 authored by Michael Foord on 19 December 2010, 03:19:47 UTC
Issue 10611. Issue 9857. Improve the way exception handling, including test skipping, is done inside TestCase.run
Issue 10611. Issue 9857. Improve the way exception handling, including test skipping, is done inside TestCase.run
Tip revision: b3468f7
capsule.c
/* Wrap void * pointers to be passed between C modules */
#include "Python.h"
/* Internal structure of PyCapsule */
typedef struct {
PyObject_HEAD
void *pointer;
const char *name;
void *context;
PyCapsule_Destructor destructor;
} PyCapsule;
static int
_is_legal_capsule(PyCapsule *capsule, const char *invalid_capsule)
{
if (!capsule || !PyCapsule_CheckExact(capsule) || capsule->pointer == NULL) {
PyErr_SetString(PyExc_ValueError, invalid_capsule);
return 0;
}
return 1;
}
#define is_legal_capsule(capsule, name) \
(_is_legal_capsule(capsule, \
name " called with invalid PyCapsule object"))
static int
name_matches(const char *name1, const char *name2) {
/* if either is NULL, */
if (!name1 || !name2) {
/* they're only the same if they're both NULL. */
return name1 == name2;
}
return !strcmp(name1, name2);
}
PyObject *
PyCapsule_New(void *pointer, const char *name, PyCapsule_Destructor destructor)
{
PyCapsule *capsule;
if (!pointer) {
PyErr_SetString(PyExc_ValueError, "PyCapsule_New called with null pointer");
return NULL;
}
capsule = PyObject_NEW(PyCapsule, &PyCapsule_Type);
if (capsule == NULL) {
return NULL;
}
capsule->pointer = pointer;
capsule->name = name;
capsule->context = NULL;
capsule->destructor = destructor;
return (PyObject *)capsule;
}
int
PyCapsule_IsValid(PyObject *o, const char *name)
{
PyCapsule *capsule = (PyCapsule *)o;
return (capsule != NULL &&
PyCapsule_CheckExact(capsule) &&
capsule->pointer != NULL &&
name_matches(capsule->name, name));
}
void *
PyCapsule_GetPointer(PyObject *o, const char *name)
{
PyCapsule *capsule = (PyCapsule *)o;
if (!is_legal_capsule(capsule, "PyCapsule_GetPointer")) {
return NULL;
}
if (!name_matches(name, capsule->name)) {
PyErr_SetString(PyExc_ValueError, "PyCapsule_GetPointer called with incorrect name");
return NULL;
}
return capsule->pointer;
}
const char *
PyCapsule_GetName(PyObject *o)
{
PyCapsule *capsule = (PyCapsule *)o;
if (!is_legal_capsule(capsule, "PyCapsule_GetName")) {
return NULL;
}
return capsule->name;
}
PyCapsule_Destructor
PyCapsule_GetDestructor(PyObject *o)
{
PyCapsule *capsule = (PyCapsule *)o;
if (!is_legal_capsule(capsule, "PyCapsule_GetDestructor")) {
return NULL;
}
return capsule->destructor;
}
void *
PyCapsule_GetContext(PyObject *o)
{
PyCapsule *capsule = (PyCapsule *)o;
if (!is_legal_capsule(capsule, "PyCapsule_GetContext")) {
return NULL;
}
return capsule->context;
}
int
PyCapsule_SetPointer(PyObject *o, void *pointer)
{
PyCapsule *capsule = (PyCapsule *)o;
if (!pointer) {
PyErr_SetString(PyExc_ValueError, "PyCapsule_SetPointer called with null pointer");
return -1;
}
if (!is_legal_capsule(capsule, "PyCapsule_SetPointer")) {
return -1;
}
capsule->pointer = pointer;
return 0;
}
int
PyCapsule_SetName(PyObject *o, const char *name)
{
PyCapsule *capsule = (PyCapsule *)o;
if (!is_legal_capsule(capsule, "PyCapsule_SetName")) {
return -1;
}
capsule->name = name;
return 0;
}
int
PyCapsule_SetDestructor(PyObject *o, PyCapsule_Destructor destructor)
{
PyCapsule *capsule = (PyCapsule *)o;
if (!is_legal_capsule(capsule, "PyCapsule_SetDestructor")) {
return -1;
}
capsule->destructor = destructor;
return 0;
}
int
PyCapsule_SetContext(PyObject *o, void *context)
{
PyCapsule *capsule = (PyCapsule *)o;
if (!is_legal_capsule(capsule, "PyCapsule_SetContext")) {
return -1;
}
capsule->context = context;
return 0;
}
void *
PyCapsule_Import(const char *name, int no_block)
{
PyObject *object = NULL;
void *return_value = NULL;
char *trace;
size_t name_length = (strlen(name) + 1) * sizeof(char);
char *name_dup = (char *)PyMem_MALLOC(name_length);
if (!name_dup) {
return NULL;
}
memcpy(name_dup, name, name_length);
trace = name_dup;
while (trace) {
char *dot = strchr(trace, '.');
if (dot) {
*dot++ = '\0';
}
if (object == NULL) {
if (no_block) {
object = PyImport_ImportModuleNoBlock(trace);
} else {
object = PyImport_ImportModule(trace);
if (!object) {
PyErr_Format(PyExc_ImportError, "PyCapsule_Import could not import module \"%s\"", trace);
}
}
} else {
PyObject *object2 = PyObject_GetAttrString(object, trace);
Py_DECREF(object);
object = object2;
}
if (!object) {
goto EXIT;
}
trace = dot;
}
/* compare attribute name to module.name by hand */
if (PyCapsule_IsValid(object, name)) {
PyCapsule *capsule = (PyCapsule *)object;
return_value = capsule->pointer;
} else {
PyErr_Format(PyExc_AttributeError,
"PyCapsule_Import \"%s\" is not valid",
name);
}
EXIT:
Py_XDECREF(object);
if (name_dup) {
PyMem_FREE(name_dup);
}
return return_value;
}
static void
capsule_dealloc(PyObject *o)
{
PyCapsule *capsule = (PyCapsule *)o;
if (capsule->destructor) {
capsule->destructor(o);
}
PyObject_DEL(o);
}
static PyObject *
capsule_repr(PyObject *o)
{
PyCapsule *capsule = (PyCapsule *)o;
const char *name;
const char *quote;
if (capsule->name) {
quote = "\"";
name = capsule->name;
} else {
quote = "";
name = "NULL";
}
return PyUnicode_FromFormat("<capsule object %s%s%s at %p>",
quote, name, quote, capsule);
}
PyDoc_STRVAR(PyCapsule_Type__doc__,
"Capsule objects let you wrap a C \"void *\" pointer in a Python\n\
object. They're a way of passing data through the Python interpreter\n\
without creating your own custom type.\n\
\n\
Capsules are used for communication between extension modules.\n\
They provide a way for an extension module to export a C interface\n\
to other extension modules, so that extension modules can use the\n\
Python import mechanism to link to one another.\n\
");
PyTypeObject PyCapsule_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"PyCapsule", /*tp_name*/
sizeof(PyCapsule), /*tp_basicsize*/
0, /*tp_itemsize*/
/* methods */
capsule_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_reserved*/
capsule_repr, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash*/
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
0, /*tp_flags*/
PyCapsule_Type__doc__ /*tp_doc*/
};
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