#include "Python.h"

#include "frameobject.h"

#include <ffi.h>

#ifdef MS_WIN32

#include <windows.h>

#include "ctypes.h"

static void

CThunkObject_dealloc(PyObject *myself)

{

CThunkObject *self = (CThunkObject *)myself;

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 *myself, visitproc visit, void *arg)

{

CThunkObject *self = (CThunkObject *)myself;

Py_VISIT(self->converters);

Py_VISIT(self->callable);

Py_VISIT(self->restype);

return 0;

}

static int

CThunkObject_clear(PyObject *myself)

{

CThunkObject *self = (CThunkObject *)myself;

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_reserved */

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(const 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 != NULL && f != Py_None)

PyFile_WriteString(buf, f);

PyErr_Print();

}

#ifdef MS_WIN32

static void

TryAddRef(StgDictObject *dict, CDataObject *obj)

{

IUnknown *punk;

PyObject *add_ref = PyDict_GetItemRefString((PyObject *)dict, "_needs_com_addref_");

if (NULL == add_ref)

return;

Py_DECREF(add_ref);

punk = *(IUnknown **)obj->b_ptr;

if (punk)

punk->lpVtbl->AddRef(punk);

return;

}

static void _CallPythonObject(void *mem,

void **pArgs)

{

Py_ssize_t i;

PyObject *result;

PyObject *arglist = NULL;

Py_ssize_t nArgs;

PyObject *error_object = NULL;

int *space;

PyGILState_STATE state = PyGILState_Ensure();

nArgs = PySequence_Length(converters);

/* Hm. What to return in case of error?

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_SetItemRef(arglist, i, v);

Py_DECREF(v);

/* XXX XXX XX

} else if (dict) {

/* Hm, shouldn't we use PyCData_AtAddress() or something like that instead? */

CDataObject *obj = (CDataObject *)_PyObject_CallNoArg(cnv);

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_SetItemRef(arglist, i, (PyObject*)obj);

Py_DECREF(obj);

#ifdef MS_WIN32

TryAddRef(dict, obj);

} 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) _PyTraceback_Add(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);

}

}

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);

}

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;

keep = setfunc(mem, result, 0);

CHECK("'converting callback result'", keep);

/* keep is an object we have to keep alive so that the result

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_WarnEx(PyExc_RuntimeWarning,

"memory leak in callback function.",

1))

PyErr_WriteUnraisable(callable);

}

}

Py_XDECREF(result);

Done:

Py_XDECREF(arglist);

PyGILState_Release(state);

}

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((PyObject *)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;

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);

result = ffi_prep_closure_loc(p->pcl_write, &p->cif, closure_fcn,

p,

p->pcl_exec);

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()) {

PyEval_InitThreads();

Py_Initialize();

}

}

long Call_GetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)

{

PyObject *mod, *func, *result;

long retval;

static PyObject *context;

if (context == NULL)

context = PyUnicode_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 = PyLong_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;

PyGILState_STATE state;

LoadPython();

state = PyGILState_Ensure();

result = Call_GetClassObject(rclsid, riid, ppv);

PyGILState_Release(state);

return result;

}

long Call_CanUnloadNow(void)

{

PyObject *mod, *func, *result;

long retval;

static PyObject *context;

if (context == NULL)

context = PyUnicode_InternFromString("_ctypes.DllCanUnloadNow");

mod = PyImport_ImportModuleNoBlock("ctypes");

if (!mod) {

/* We assume that this error can only occur when shutting

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_CallNoArg(func);

Py_DECREF(func);

if (!result) {

PyErr_WriteUnraisable(context ? context : Py_None);

return E_FAIL;

}

retval = PyLong_AsLong(result);

if (PyErr_Occurred()) {

PyErr_WriteUnraisable(context ? context : Py_None);

retval = E_FAIL;

}

Py_DECREF(result);

return retval;

}

STDAPI DllCanUnloadNow(void)

{

long result;

PyGILState_STATE state = PyGILState_Ensure();

result = Call_CanUnloadNow();

PyGILState_Release(state);

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;

}