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callbacks.c
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669 lines (604 loc) · 19.7 KB
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/*****************************************************************
This file contains remnant Python 2.3 compatibility code that is no longer
strictly required.
*****************************************************************/
#include "Python.h"
#include "compile.h" /* required only for 2.3, as it seems */
#include "frameobject.h"
#include <ffi.h>
#ifdef MS_WIN32
#include <windows.h>
#endif
#include "ctypes.h"
/**************************************************************/
static void
CThunkObject_dealloc(PyObject *_self)
{
CThunkObject *self = (CThunkObject *)_self;
PyObject_GC_UnTrack(self);
Py_XDECREF(self->converters);
Py_XDECREF(self->callable);
Py_XDECREF(self->restype);
if (self->pcl_write)
ffi_closure_free(self->pcl_write);
PyObject_GC_Del(self);
}
static int
CThunkObject_traverse(PyObject *_self, visitproc visit, void *arg)
{
CThunkObject *self = (CThunkObject *)_self;
Py_VISIT(self->converters);
Py_VISIT(self->callable);
Py_VISIT(self->restype);
return 0;
}
static int
CThunkObject_clear(PyObject *_self)
{
CThunkObject *self = (CThunkObject *)_self;
Py_CLEAR(self->converters);
Py_CLEAR(self->callable);
Py_CLEAR(self->restype);
return 0;
}
PyTypeObject PyCThunk_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"_ctypes.CThunkObject",
sizeof(CThunkObject), /* tp_basicsize */
sizeof(ffi_type), /* tp_itemsize */
CThunkObject_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* 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 */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
"CThunkObject", /* tp_doc */
CThunkObject_traverse, /* tp_traverse */
CThunkObject_clear, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
};
/**************************************************************/
static void
PrintError(char *msg, ...)
{
char buf[512];
PyObject *f = PySys_GetObject("stderr");
va_list marker;
va_start(marker, msg);
vsnprintf(buf, sizeof(buf), msg, marker);
va_end(marker);
if (f)
PyFile_WriteString(buf, f);
PyErr_Print();
}
#if (PY_VERSION_HEX < 0x02070000)
PyCodeObject *
PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)
{
static PyObject *emptystring = NULL;
static PyObject *nulltuple = NULL;
PyObject *filename_ob = NULL;
PyObject *funcname_ob = NULL;
PyCodeObject *result = NULL;
if (emptystring == NULL) {
emptystring = PyString_FromString("");
if (emptystring == NULL)
goto failed;
}
if (nulltuple == NULL) {
nulltuple = PyTuple_New(0);
if (nulltuple == NULL)
goto failed;
}
funcname_ob = PyString_FromString(funcname);
if (funcname_ob == NULL)
goto failed;
filename_ob = PyString_FromString(filename);
if (filename_ob == NULL)
goto failed;
result = PyCode_New(0, /* argcount */
0, /* nlocals */
0, /* stacksize */
0, /* flags */
emptystring, /* code */
nulltuple, /* consts */
nulltuple, /* names */
nulltuple, /* varnames */
nulltuple, /* freevars */
nulltuple, /* cellvars */
filename_ob, /* filename */
funcname_ob, /* name */
firstlineno, /* firstlineno */
emptystring /* lnotab */
);
failed:
Py_XDECREF(funcname_ob);
Py_XDECREF(filename_ob);
return result;
}
#endif
/* after code that pyrex generates */
void _ctypes_add_traceback(char *funcname, char *filename, int lineno)
{
PyObject *py_globals = 0;
PyCodeObject *py_code = 0;
PyFrameObject *py_frame = 0;
py_globals = PyDict_New();
if (!py_globals) goto bad;
py_code = PyCode_NewEmpty(filename, funcname, lineno);
if (!py_code) goto bad;
py_frame = PyFrame_New(
PyThreadState_Get(), /*PyThreadState *tstate,*/
py_code, /*PyCodeObject *code,*/
py_globals, /*PyObject *globals,*/
0 /*PyObject *locals*/
);
if (!py_frame) goto bad;
py_frame->f_lineno = lineno;
PyTraceBack_Here(py_frame);
bad:
Py_XDECREF(py_globals);
Py_XDECREF(py_code);
Py_XDECREF(py_frame);
}
#ifdef MS_WIN32
/*
* We must call AddRef() on non-NULL COM pointers we receive as arguments
* to callback functions - these functions are COM method implementations.
* The Python instances we create have a __del__ method which calls Release().
*
* The presence of a class attribute named '_needs_com_addref_' triggers this
* behaviour. It would also be possible to call the AddRef() Python method,
* after checking for PyObject_IsTrue(), but this would probably be somewhat
* slower.
*/
static void
TryAddRef(StgDictObject *dict, CDataObject *obj)
{
IUnknown *punk;
if (NULL == PyDict_GetItemString((PyObject *)dict, "_needs_com_addref_"))
return;
punk = *(IUnknown **)obj->b_ptr;
if (punk)
punk->lpVtbl->AddRef(punk);
return;
}
#endif
/******************************************************************************
*
* Call the python object with all arguments
*
*/
static void _CallPythonObject(void *mem,
ffi_type *restype,
SETFUNC setfunc,
PyObject *callable,
PyObject *converters,
int flags,
void **pArgs)
{
Py_ssize_t i;
PyObject *result;
PyObject *arglist = NULL;
Py_ssize_t nArgs;
PyObject *error_object = NULL;
int *space;
#ifdef WITH_THREAD
PyGILState_STATE state = PyGILState_Ensure();
#endif
nArgs = PySequence_Length(converters);
/* Hm. What to return in case of error?
For COM, 0xFFFFFFFF seems better than 0.
*/
if (nArgs < 0) {
PrintError("BUG: PySequence_Length");
goto Done;
}
arglist = PyTuple_New(nArgs);
if (!arglist) {
PrintError("PyTuple_New()");
goto Done;
}
for (i = 0; i < nArgs; ++i) {
/* Note: new reference! */
PyObject *cnv = PySequence_GetItem(converters, i);
StgDictObject *dict;
if (cnv)
dict = PyType_stgdict(cnv);
else {
PrintError("Getting argument converter %d\n", i);
goto Done;
}
if (dict && dict->getfunc && !_ctypes_simple_instance(cnv)) {
PyObject *v = dict->getfunc(*pArgs, dict->size);
if (!v) {
PrintError("create argument %d:\n", i);
Py_DECREF(cnv);
goto Done;
}
PyTuple_SET_ITEM(arglist, i, v);
/* XXX XXX XX
We have the problem that c_byte or c_short have dict->size of
1 resp. 4, but these parameters are pushed as sizeof(int) bytes.
BTW, the same problem occurs when they are pushed as parameters
*/
} else if (dict) {
/* Hm, shouldn't we use PyCData_AtAddress() or something like that instead? */
CDataObject *obj = (CDataObject *)PyObject_CallFunctionObjArgs(cnv, NULL);
if (!obj) {
PrintError("create argument %d:\n", i);
Py_DECREF(cnv);
goto Done;
}
if (!CDataObject_Check(obj)) {
Py_DECREF(obj);
Py_DECREF(cnv);
PrintError("unexpected result of create argument %d:\n", i);
goto Done;
}
memcpy(obj->b_ptr, *pArgs, dict->size);
PyTuple_SET_ITEM(arglist, i, (PyObject *)obj);
#ifdef MS_WIN32
TryAddRef(dict, obj);
#endif
} else {
PyErr_SetString(PyExc_TypeError,
"cannot build parameter");
PrintError("Parsing argument %d\n", i);
Py_DECREF(cnv);
goto Done;
}
Py_DECREF(cnv);
/* XXX error handling! */
pArgs++;
}
#define CHECK(what, x) \
if (x == NULL) _ctypes_add_traceback(what, "_ctypes/callbacks.c", __LINE__ - 1), PyErr_Print()
if (flags & (FUNCFLAG_USE_ERRNO | FUNCFLAG_USE_LASTERROR)) {
error_object = _ctypes_get_errobj(&space);
if (error_object == NULL)
goto Done;
if (flags & FUNCFLAG_USE_ERRNO) {
int temp = space[0];
space[0] = errno;
errno = temp;
}
#ifdef MS_WIN32
if (flags & FUNCFLAG_USE_LASTERROR) {
int temp = space[1];
space[1] = GetLastError();
SetLastError(temp);
}
#endif
}
result = PyObject_CallObject(callable, arglist);
CHECK("'calling callback function'", result);
#ifdef MS_WIN32
if (flags & FUNCFLAG_USE_LASTERROR) {
int temp = space[1];
space[1] = GetLastError();
SetLastError(temp);
}
#endif
if (flags & FUNCFLAG_USE_ERRNO) {
int temp = space[0];
space[0] = errno;
errno = temp;
}
Py_XDECREF(error_object);
if ((restype != &ffi_type_void) && result) {
PyObject *keep;
assert(setfunc);
#ifdef WORDS_BIGENDIAN
/* See the corresponding code in callproc.c, around line 961 */
if (restype->type != FFI_TYPE_FLOAT && restype->size < sizeof(ffi_arg))
mem = (char *)mem + sizeof(ffi_arg) - restype->size;
#endif
keep = setfunc(mem, result, 0);
CHECK("'converting callback result'", keep);
/* keep is an object we have to keep alive so that the result
stays valid. If there is no such object, the setfunc will
have returned Py_None.
If there is such an object, we have no choice than to keep
it alive forever - but a refcount and/or memory leak will
be the result. EXCEPT when restype is py_object - Python
itself knows how to manage the refcount of these objects.
*/
if (keep == NULL) /* Could not convert callback result. */
PyErr_WriteUnraisable(callable);
else if (keep == Py_None) /* Nothing to keep */
Py_DECREF(keep);
else if (setfunc != _ctypes_get_fielddesc("O")->setfunc) {
if (-1 == PyErr_Warn(PyExc_RuntimeWarning,
"memory leak in callback function."))
PyErr_WriteUnraisable(callable);
}
}
Py_XDECREF(result);
Done:
Py_XDECREF(arglist);
#ifdef WITH_THREAD
PyGILState_Release(state);
#endif
}
static void closure_fcn(ffi_cif *cif,
void *resp,
void **args,
void *userdata)
{
CThunkObject *p = (CThunkObject *)userdata;
_CallPythonObject(resp,
p->ffi_restype,
p->setfunc,
p->callable,
p->converters,
p->flags,
args);
}
static CThunkObject* CThunkObject_new(Py_ssize_t nArgs)
{
CThunkObject *p;
Py_ssize_t i;
p = PyObject_GC_NewVar(CThunkObject, &PyCThunk_Type, nArgs);
if (p == NULL) {
PyErr_NoMemory();
return NULL;
}
p->pcl_write = NULL;
p->pcl_exec = NULL;
memset(&p->cif, 0, sizeof(p->cif));
p->flags = 0;
p->converters = NULL;
p->callable = NULL;
p->restype = NULL;
p->setfunc = NULL;
p->ffi_restype = NULL;
for (i = 0; i < nArgs + 1; ++i)
p->atypes[i] = NULL;
PyObject_GC_Track((PyObject *)p);
return p;
}
CThunkObject *_ctypes_alloc_callback(PyObject *callable,
PyObject *converters,
PyObject *restype,
int flags)
{
int result;
CThunkObject *p;
Py_ssize_t nArgs, i;
ffi_abi cc;
nArgs = PySequence_Size(converters);
p = CThunkObject_new(nArgs);
if (p == NULL)
return NULL;
assert(CThunk_CheckExact(p));
p->pcl_write = ffi_closure_alloc(sizeof(ffi_closure),
&p->pcl_exec);
if (p->pcl_write == NULL) {
PyErr_NoMemory();
goto error;
}
p->flags = flags;
for (i = 0; i < nArgs; ++i) {
PyObject *cnv = PySequence_GetItem(converters, i);
if (cnv == NULL)
goto error;
p->atypes[i] = _ctypes_get_ffi_type(cnv);
Py_DECREF(cnv);
}
p->atypes[i] = NULL;
Py_INCREF(restype);
p->restype = restype;
if (restype == Py_None) {
p->setfunc = NULL;
p->ffi_restype = &ffi_type_void;
} else {
StgDictObject *dict = PyType_stgdict(restype);
if (dict == NULL || dict->setfunc == NULL) {
PyErr_SetString(PyExc_TypeError,
"invalid result type for callback function");
goto error;
}
p->setfunc = dict->setfunc;
p->ffi_restype = &dict->ffi_type_pointer;
}
cc = FFI_DEFAULT_ABI;
#if defined(MS_WIN32) && !defined(_WIN32_WCE) && !defined(MS_WIN64)
if ((flags & FUNCFLAG_CDECL) == 0)
cc = FFI_STDCALL;
#endif
result = ffi_prep_cif(&p->cif, cc,
Py_SAFE_DOWNCAST(nArgs, Py_ssize_t, int),
_ctypes_get_ffi_type(restype),
&p->atypes[0]);
if (result != FFI_OK) {
PyErr_Format(PyExc_RuntimeError,
"ffi_prep_cif failed with %d", result);
goto error;
}
#if defined(X86_DARWIN) || defined(POWERPC_DARWIN)
result = ffi_prep_closure(p->pcl_write, &p->cif, closure_fcn, p);
#else
result = ffi_prep_closure_loc(p->pcl_write, &p->cif, closure_fcn,
p,
p->pcl_exec);
#endif
if (result != FFI_OK) {
PyErr_Format(PyExc_RuntimeError,
"ffi_prep_closure failed with %d", result);
goto error;
}
Py_INCREF(converters);
p->converters = converters;
Py_INCREF(callable);
p->callable = callable;
return p;
error:
Py_XDECREF(p);
return NULL;
}
#ifdef MS_WIN32
static void LoadPython(void)
{
if (!Py_IsInitialized()) {
#ifdef WITH_THREAD
PyEval_InitThreads();
#endif
Py_Initialize();
}
}
/******************************************************************/
long Call_GetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
{
PyObject *mod, *func, *result;
long retval;
static PyObject *context;
if (context == NULL)
context = PyString_InternFromString("_ctypes.DllGetClassObject");
mod = PyImport_ImportModuleNoBlock("ctypes");
if (!mod) {
PyErr_WriteUnraisable(context ? context : Py_None);
/* There has been a warning before about this already */
return E_FAIL;
}
func = PyObject_GetAttrString(mod, "DllGetClassObject");
Py_DECREF(mod);
if (!func) {
PyErr_WriteUnraisable(context ? context : Py_None);
return E_FAIL;
}
{
PyObject *py_rclsid = PyLong_FromVoidPtr((void *)rclsid);
PyObject *py_riid = PyLong_FromVoidPtr((void *)riid);
PyObject *py_ppv = PyLong_FromVoidPtr(ppv);
if (!py_rclsid || !py_riid || !py_ppv) {
Py_XDECREF(py_rclsid);
Py_XDECREF(py_riid);
Py_XDECREF(py_ppv);
Py_DECREF(func);
PyErr_WriteUnraisable(context ? context : Py_None);
return E_FAIL;
}
result = PyObject_CallFunctionObjArgs(func,
py_rclsid,
py_riid,
py_ppv,
NULL);
Py_DECREF(py_rclsid);
Py_DECREF(py_riid);
Py_DECREF(py_ppv);
}
Py_DECREF(func);
if (!result) {
PyErr_WriteUnraisable(context ? context : Py_None);
return E_FAIL;
}
retval = PyInt_AsLong(result);
if (PyErr_Occurred()) {
PyErr_WriteUnraisable(context ? context : Py_None);
retval = E_FAIL;
}
Py_DECREF(result);
return retval;
}
STDAPI DllGetClassObject(REFCLSID rclsid,
REFIID riid,
LPVOID *ppv)
{
long result;
#ifdef WITH_THREAD
PyGILState_STATE state;
#endif
LoadPython();
#ifdef WITH_THREAD
state = PyGILState_Ensure();
#endif
result = Call_GetClassObject(rclsid, riid, ppv);
#ifdef WITH_THREAD
PyGILState_Release(state);
#endif
return result;
}
long Call_CanUnloadNow(void)
{
PyObject *mod, *func, *result;
long retval;
static PyObject *context;
if (context == NULL)
context = PyString_InternFromString("_ctypes.DllCanUnloadNow");
mod = PyImport_ImportModuleNoBlock("ctypes");
if (!mod) {
/* OutputDebugString("Could not import ctypes"); */
/* We assume that this error can only occur when shutting
down, so we silently ignore it */
PyErr_Clear();
return E_FAIL;
}
/* Other errors cannot be raised, but are printed to stderr */
func = PyObject_GetAttrString(mod, "DllCanUnloadNow");
Py_DECREF(mod);
if (!func) {
PyErr_WriteUnraisable(context ? context : Py_None);
return E_FAIL;
}
result = PyObject_CallFunction(func, NULL);
Py_DECREF(func);
if (!result) {
PyErr_WriteUnraisable(context ? context : Py_None);
return E_FAIL;
}
retval = PyInt_AsLong(result);
if (PyErr_Occurred()) {
PyErr_WriteUnraisable(context ? context : Py_None);
retval = E_FAIL;
}
Py_DECREF(result);
return retval;
}
/*
DllRegisterServer and DllUnregisterServer still missing
*/
STDAPI DllCanUnloadNow(void)
{
long result;
#ifdef WITH_THREAD
PyGILState_STATE state = PyGILState_Ensure();
#endif
result = Call_CanUnloadNow();
#ifdef WITH_THREAD
PyGILState_Release(state);
#endif
return result;
}
#ifndef Py_NO_ENABLE_SHARED
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvRes)
{
switch(fdwReason) {
case DLL_PROCESS_ATTACH:
DisableThreadLibraryCalls(hinstDLL);
break;
}
return TRUE;
}
#endif
#endif
/*
Local Variables:
compile-command: "cd .. && python setup.py -q build_ext"
End:
*/