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/*
* $Id$
*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/python/generic/py_capi_utils.c
* \ingroup pygen
*/
#include <Python.h>
#include <frameobject.h>
#include "py_capi_utils.h"
/* for debugging */
void PyC_ObSpit(const char *name, PyObject *var) {
fprintf(stderr, "<%s> : ", name);
if (var==NULL) {
fprintf(stderr, "<NIL>");
}
else {
PyObject_Print(var, stderr, 0);
fprintf(stderr, " ref:%d ", (int)var->ob_refcnt);
fprintf(stderr, " ptr:%p", (void *)var);
fprintf(stderr, " type:");
if(Py_TYPE(var))
fprintf(stderr, "%s", Py_TYPE(var)->tp_name);
else
fprintf(stderr, "<NIL>");
}
fprintf(stderr, "\n");
}
void PyC_LineSpit(void) {
const char *filename;
int lineno;
PyErr_Clear();
PyC_FileAndNum(&filename, &lineno);
fprintf(stderr, "%s:%d\n", filename, lineno);
}
void PyC_FileAndNum(const char **filename, int *lineno)
{
PyFrameObject *frame;
if (filename) *filename= NULL;
if (lineno) *lineno = -1;
if (!(frame= PyThreadState_GET()->frame)) {
return;
}
/* when executing a script */
if (filename) {
*filename = _PyUnicode_AsString(frame->f_code->co_filename);
}
/* when executing a module */
if(filename && *filename == NULL) {
/* try an alternative method to get the filename - module based
* references below are all borrowed (double checked) */
PyObject *mod_name= PyDict_GetItemString(PyEval_GetGlobals(), "__name__");
if(mod_name) {
PyObject *mod= PyDict_GetItem(PyImport_GetModuleDict(), mod_name);
if(mod) {
*filename= PyModule_GetFilename(mod);
}
/* unlikely, fallback */
if(*filename == NULL) {
*filename= _PyUnicode_AsString(mod_name);
}
}
}
if (lineno) {
*lineno = PyFrame_GetLineNumber(frame);
}
}
/* Would be nice if python had this built in */
PyObject *PyC_Object_GetAttrStringArgs(PyObject *o, Py_ssize_t n, ...)
{
Py_ssize_t i;
PyObject *item= o;
char *attr;
va_list vargs;
va_start(vargs, n);
for (i=0; i<n; i++) {
attr = va_arg(vargs, char *);
item = PyObject_GetAttrString(item, attr);
if (item)
Py_DECREF(item);
else /* python will set the error value here */
break;
}
va_end(vargs);
Py_XINCREF(item); /* final value has is increfed, to match PyObject_GetAttrString */
return item;
}
/* returns the exception string as a new PyUnicode object, depends on external StringIO module */
PyObject *PyC_ExceptionBuffer(void)
{
PyObject *stdout_backup = PySys_GetObject("stdout"); /* borrowed */
PyObject *stderr_backup = PySys_GetObject("stderr"); /* borrowed */
PyObject *string_io = NULL;
PyObject *string_io_buf = NULL;
PyObject *string_io_mod= NULL;
PyObject *string_io_getvalue= NULL;
PyObject *error_type, *error_value, *error_traceback;
if (!PyErr_Occurred())
return NULL;
PyErr_Fetch(&error_type, &error_value, &error_traceback);
PyErr_Clear();
/* import io
* string_io = io.StringIO()
*/
if(! (string_io_mod= PyImport_ImportModule("io")) ) {
goto error_cleanup;
}
else if (! (string_io = PyObject_CallMethod(string_io_mod, (char *)"StringIO", NULL))) {
goto error_cleanup;
}
else if (! (string_io_getvalue= PyObject_GetAttrString(string_io, "getvalue"))) {
goto error_cleanup;
}
Py_INCREF(stdout_backup); // since these were borrowed we dont want them freed when replaced.
Py_INCREF(stderr_backup);
PySys_SetObject("stdout", string_io); // both of these are free'd when restoring
PySys_SetObject("stderr", string_io);
PyErr_Restore(error_type, error_value, error_traceback);
PyErr_Print(); /* print the error */
PyErr_Clear();
string_io_buf = PyObject_CallObject(string_io_getvalue, NULL);
PySys_SetObject("stdout", stdout_backup);
PySys_SetObject("stderr", stderr_backup);
Py_DECREF(stdout_backup); /* now sys owns the ref again */
Py_DECREF(stderr_backup);
Py_DECREF(string_io_mod);
Py_DECREF(string_io_getvalue);
Py_DECREF(string_io); /* free the original reference */
PyErr_Clear();
return string_io_buf;
error_cleanup:
/* could not import the module so print the error and close */
Py_XDECREF(string_io_mod);
Py_XDECREF(string_io);
PyErr_Restore(error_type, error_value, error_traceback);
PyErr_Print(); /* print the error */
PyErr_Clear();
return NULL;
}
/* string conversion, escape non-unicode chars, coerce must be set to NULL */
const char *PyC_UnicodeAsByte(PyObject *py_str, PyObject **coerce)
{
char *result;
result= _PyUnicode_AsString(py_str);
if(result) {
/* 99% of the time this is enough but we better support non unicode
* chars since blender doesnt limit this */
return result;
}
else if(PyBytes_Check(py_str)) {
PyErr_Clear();
return PyBytes_AS_STRING(py_str);
}
else {
return PyBytes_AS_STRING((*coerce= PyUnicode_EncodeFSDefault(py_str)));
}
}
PyObject *PyC_UnicodeFromByte(const char *str)
{
PyObject *result= PyUnicode_FromString(str);
if(result) {
/* 99% of the time this is enough but we better support non unicode
* chars since blender doesnt limit this */
return result;
}
else {
PyErr_Clear();
/* this means paths will always be accessible once converted, on all OS's */
result= PyUnicode_DecodeFSDefault(str);
return result;
}
}
/*****************************************************************************
* Description: This function creates a new Python dictionary object.
* note: dict is owned by sys.modules["__main__"] module, reference is borrowed
* note: important we use the dict from __main__, this is what python expects
for 'pickle' to work as well as strings like this...
>> foo = 10
>> print(__import__("__main__").foo)
*
* note: this overwrites __main__ which gives problems with nested calles.
* be sure to run PyC_MainModule_Backup & PyC_MainModule_Restore if there is
* any chance that python is in the call stack.
*****************************************************************************/
PyObject *PyC_DefaultNameSpace(const char *filename)
{
PyInterpreterState *interp= PyThreadState_GET()->interp;
PyObject *mod_main= PyModule_New("__main__");
PyDict_SetItemString(interp->modules, "__main__", mod_main);
Py_DECREF(mod_main); /* sys.modules owns now */
PyModule_AddStringConstant(mod_main, "__name__", "__main__");
if(filename)
PyModule_AddStringConstant(mod_main, "__file__", filename); /* __file__ only for nice UI'ness */
PyModule_AddObject(mod_main, "__builtins__", interp->builtins);
Py_INCREF(interp->builtins); /* AddObject steals a reference */
return PyModule_GetDict(mod_main);
}
/* restore MUST be called after this */
void PyC_MainModule_Backup(PyObject **main_mod)
{
PyInterpreterState *interp= PyThreadState_GET()->interp;
*main_mod= PyDict_GetItemString(interp->modules, "__main__");
Py_XINCREF(*main_mod); /* dont free */
}
void PyC_MainModule_Restore(PyObject *main_mod)
{
PyInterpreterState *interp= PyThreadState_GET()->interp;
PyDict_SetItemString(interp->modules, "__main__", main_mod);
Py_XDECREF(main_mod);
}
/* Would be nice if python had this built in */
void PyC_RunQuicky(const char *filepath, int n, ...)
{
FILE *fp= fopen(filepath, "r");
if(fp) {
PyGILState_STATE gilstate= PyGILState_Ensure();
va_list vargs;
int *sizes= PyMem_MALLOC(sizeof(int) * (n / 2));
int i;
PyObject *py_dict = PyC_DefaultNameSpace(filepath);
PyObject *values= PyList_New(n / 2); /* namespace owns this, dont free */
PyObject *py_result, *ret;
PyObject *struct_mod= PyImport_ImportModule("struct");
PyObject *calcsize= PyObject_GetAttrString(struct_mod, "calcsize"); /* struct.calcsize */
PyObject *pack= PyObject_GetAttrString(struct_mod, "pack"); /* struct.pack */
PyObject *unpack= PyObject_GetAttrString(struct_mod, "unpack"); /* struct.unpack */
Py_DECREF(struct_mod);
va_start(vargs, n);
for (i=0; i * 2<n; i++) {
char *format = va_arg(vargs, char *);
void *ptr = va_arg(vargs, void *);
ret= PyObject_CallFunction(calcsize, (char *)"s", format);
if(ret) {
sizes[i]= PyLong_AsSsize_t(ret);
Py_DECREF(ret);
ret = PyObject_CallFunction(unpack, (char *)"sy#", format, (char *)ptr, sizes[i]);
}
if(ret == NULL) {
printf("PyC_InlineRun error, line:%d\n", __LINE__);
PyErr_Print();
PyErr_Clear();
PyList_SET_ITEM(values, i, Py_None); /* hold user */
Py_INCREF(Py_None);
sizes[i]= 0;
}
else {
if(PyTuple_GET_SIZE(ret) == 1) {
/* convenience, convert single tuples into single values */
PyObject *tmp= PyTuple_GET_ITEM(ret, 0);
Py_INCREF(tmp);
Py_DECREF(ret);
ret = tmp;
}
PyList_SET_ITEM(values, i, ret); /* hold user */
}
}
va_end(vargs);
/* set the value so we can access it */
PyDict_SetItemString(py_dict, "values", values);
py_result = PyRun_File(fp, filepath, Py_file_input, py_dict, py_dict);
fclose(fp);
if(py_result) {
/* we could skip this but then only slice assignment would work
* better not be so strict */
values= PyDict_GetItemString(py_dict, "values");
if(values && PyList_Check(values)) {
/* dont use the result */
Py_DECREF(py_result);
py_result= NULL;
/* now get the values back */
va_start(vargs, n);
for (i=0; i*2 <n; i++) {
char *format = va_arg(vargs, char *);
void *ptr = va_arg(vargs, void *);
PyObject *item;
PyObject *item_new;
/* prepend the string formatting and remake the tuple */
item= PyList_GET_ITEM(values, i);
if(PyTuple_CheckExact(item)) {
int ofs= PyTuple_GET_SIZE(item);
item_new= PyTuple_New(ofs + 1);
while(ofs--) {
PyObject *member= PyTuple_GET_ITEM(item, ofs);
PyTuple_SET_ITEM(item_new, ofs + 1, member);
Py_INCREF(member);
}
PyTuple_SET_ITEM(item_new, 0, PyUnicode_FromString(format));
}
else {
item_new= Py_BuildValue("sO", format, item);
}
ret = PyObject_Call(pack, item_new, NULL);
if(ret) {
/* copy the bytes back into memory */
memcpy(ptr, PyBytes_AS_STRING(ret), sizes[i]);
Py_DECREF(ret);
}
else {
printf("PyC_InlineRun error on arg '%d', line:%d\n", i, __LINE__);
PyC_ObSpit("failed converting:", item_new);
PyErr_Print();
PyErr_Clear();
}
Py_DECREF(item_new);
}
va_end(vargs);
}
else {
printf("PyC_InlineRun error, 'values' not a list, line:%d\n", __LINE__);
}
}
else {
printf("PyC_InlineRun error line:%d\n", __LINE__);
PyErr_Print();
PyErr_Clear();
}
Py_DECREF(calcsize);
Py_DECREF(pack);
Py_DECREF(unpack);
PyMem_FREE(sizes);
PyGILState_Release(gilstate);
}
}
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