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cpython/Python/structmember.c

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/* Map C struct members to Python object attributes */
#include "Python.h"
#include "pycore_abstract.h" // _PyNumber_Index()
#include "pycore_long.h" // _PyLong_IsNegative()
PyObject *
PyMember_GetOne(const char *obj_addr, PyMemberDef *l)
{
PyObject *v;
if (l->flags & Py_RELATIVE_OFFSET) {
PyErr_SetString(
PyExc_SystemError,
"PyMember_GetOne used with Py_RELATIVE_OFFSET");
return NULL;
}
const char* addr = obj_addr + l->offset;
switch (l->type) {
case Py_T_BOOL:
v = PyBool_FromLong(*(char*)addr);
break;
case Py_T_BYTE:
v = PyLong_FromLong(*(char*)addr);
break;
case Py_T_UBYTE:
v = PyLong_FromUnsignedLong(*(unsigned char*)addr);
break;
case Py_T_SHORT:
v = PyLong_FromLong(*(short*)addr);
break;
case Py_T_USHORT:
v = PyLong_FromUnsignedLong(*(unsigned short*)addr);
break;
case Py_T_INT:
v = PyLong_FromLong(*(int*)addr);
break;
case Py_T_UINT:
v = PyLong_FromUnsignedLong(*(unsigned int*)addr);
break;
case Py_T_LONG:
v = PyLong_FromLong(*(long*)addr);
break;
case Py_T_ULONG:
v = PyLong_FromUnsignedLong(*(unsigned long*)addr);
break;
case Py_T_PYSSIZET:
v = PyLong_FromSsize_t(*(Py_ssize_t*)addr);
break;
case Py_T_FLOAT:
v = PyFloat_FromDouble((double)*(float*)addr);
break;
case Py_T_DOUBLE:
v = PyFloat_FromDouble(*(double*)addr);
break;
case Py_T_STRING:
if (*(char**)addr == NULL) {
v = Py_NewRef(Py_None);
}
else
v = PyUnicode_FromString(*(char**)addr);
break;
case Py_T_STRING_INPLACE:
v = PyUnicode_FromString((char*)addr);
break;
case Py_T_CHAR:
v = PyUnicode_FromStringAndSize((char*)addr, 1);
break;
case _Py_T_OBJECT:
v = *(PyObject **)addr;
if (v == NULL)
v = Py_None;
Py_INCREF(v);
break;
case Py_T_OBJECT_EX:
v = *(PyObject **)addr;
if (v == NULL) {
PyObject *obj = (PyObject *)obj_addr;
PyTypeObject *tp = Py_TYPE(obj);
PyErr_Format(PyExc_AttributeError,
"'%.200s' object has no attribute '%s'",
tp->tp_name, l->name);
}
Py_XINCREF(v);
break;
case Py_T_LONGLONG:
v = PyLong_FromLongLong(*(long long *)addr);
break;
case Py_T_ULONGLONG:
v = PyLong_FromUnsignedLongLong(*(unsigned long long *)addr);
break;
case _Py_T_NONE:
v = Py_NewRef(Py_None);
break;
default:
PyErr_SetString(PyExc_SystemError, "bad memberdescr type");
v = NULL;
}
return v;
}
#define WARN(msg) \
do { \
if (PyErr_WarnEx(PyExc_RuntimeWarning, msg, 1) < 0) \
return -1; \
} while (0)
int
PyMember_SetOne(char *addr, PyMemberDef *l, PyObject *v)
{
PyObject *oldv;
if (l->flags & Py_RELATIVE_OFFSET) {
PyErr_SetString(
PyExc_SystemError,
"PyMember_SetOne used with Py_RELATIVE_OFFSET");
return -1;
}
addr += l->offset;
if ((l->flags & Py_READONLY))
{
PyErr_SetString(PyExc_AttributeError, "readonly attribute");
return -1;
}
if (v == NULL) {
if (l->type == Py_T_OBJECT_EX) {
/* Check if the attribute is set. */
if (*(PyObject **)addr == NULL) {
PyErr_SetString(PyExc_AttributeError, l->name);
return -1;
}
}
else if (l->type != _Py_T_OBJECT) {
PyErr_SetString(PyExc_TypeError,
"can't delete numeric/char attribute");
return -1;
}
}
switch (l->type) {
case Py_T_BOOL:{
if (!PyBool_Check(v)) {
PyErr_SetString(PyExc_TypeError,
"attribute value type must be bool");
return -1;
}
if (v == Py_True)
*(char*)addr = (char) 1;
else
*(char*)addr = (char) 0;
break;
}
case Py_T_BYTE:{
long long_val = PyLong_AsLong(v);
if ((long_val == -1) && PyErr_Occurred())
return -1;
*(char*)addr = (char)long_val;
/* XXX: For compatibility, only warn about truncations
for now. */
if ((long_val > CHAR_MAX) || (long_val < CHAR_MIN))
WARN("Truncation of value to char");
break;
}
case Py_T_UBYTE:{
long long_val = PyLong_AsLong(v);
if ((long_val == -1) && PyErr_Occurred())
return -1;
*(unsigned char*)addr = (unsigned char)long_val;
if ((long_val > UCHAR_MAX) || (long_val < 0))
WARN("Truncation of value to unsigned char");
break;
}
case Py_T_SHORT:{
long long_val = PyLong_AsLong(v);
if ((long_val == -1) && PyErr_Occurred())
return -1;
*(short*)addr = (short)long_val;
if ((long_val > SHRT_MAX) || (long_val < SHRT_MIN))
WARN("Truncation of value to short");
break;
}
case Py_T_USHORT:{
long long_val = PyLong_AsLong(v);
if ((long_val == -1) && PyErr_Occurred())
return -1;
*(unsigned short*)addr = (unsigned short)long_val;
if ((long_val > USHRT_MAX) || (long_val < 0))
WARN("Truncation of value to unsigned short");
break;
}
case Py_T_INT:{
long long_val = PyLong_AsLong(v);
if ((long_val == -1) && PyErr_Occurred())
return -1;
*(int *)addr = (int)long_val;
if ((long_val > INT_MAX) || (long_val < INT_MIN))
WARN("Truncation of value to int");
break;
}
case Py_T_UINT: {
/* XXX: For compatibility, accept negative int values
as well. */
v = _PyNumber_Index(v);
if (v == NULL) {
return -1;
}
if (_PyLong_IsNegative((PyLongObject *)v)) {
long long_val = PyLong_AsLong(v);
Py_DECREF(v);
if (long_val == -1 && PyErr_Occurred()) {
return -1;
}
*(unsigned int *)addr = (unsigned int)(unsigned long)long_val;
WARN("Writing negative value into unsigned field");
}
else {
unsigned long ulong_val = PyLong_AsUnsignedLong(v);
Py_DECREF(v);
if (ulong_val == (unsigned long)-1 && PyErr_Occurred()) {
return -1;
}
*(unsigned int*)addr = (unsigned int)ulong_val;
if (ulong_val > UINT_MAX) {
WARN("Truncation of value to unsigned int");
}
}
break;
}
case Py_T_LONG:{
*(long*)addr = PyLong_AsLong(v);
if ((*(long*)addr == -1) && PyErr_Occurred())
return -1;
break;
}
case Py_T_ULONG: {
/* XXX: For compatibility, accept negative int values
as well. */
v = _PyNumber_Index(v);
if (v == NULL) {
return -1;
}
if (_PyLong_IsNegative((PyLongObject *)v)) {
long long_val = PyLong_AsLong(v);
Py_DECREF(v);
if (long_val == -1 && PyErr_Occurred()) {
return -1;
}
*(unsigned long *)addr = (unsigned long)long_val;
WARN("Writing negative value into unsigned field");
}
else {
unsigned long ulong_val = PyLong_AsUnsignedLong(v);
Py_DECREF(v);
if (ulong_val == (unsigned long)-1 && PyErr_Occurred()) {
return -1;
}
*(unsigned long*)addr = ulong_val;
}
break;
}
case Py_T_PYSSIZET:{
*(Py_ssize_t*)addr = PyLong_AsSsize_t(v);
if ((*(Py_ssize_t*)addr == (Py_ssize_t)-1)
&& PyErr_Occurred())
return -1;
break;
}
case Py_T_FLOAT:{
double double_val = PyFloat_AsDouble(v);
if ((double_val == -1) && PyErr_Occurred())
return -1;
*(float*)addr = (float)double_val;
break;
}
case Py_T_DOUBLE:
*(double*)addr = PyFloat_AsDouble(v);
if ((*(double*)addr == -1) && PyErr_Occurred())
return -1;
break;
case _Py_T_OBJECT:
case Py_T_OBJECT_EX:
oldv = *(PyObject **)addr;
*(PyObject **)addr = Py_XNewRef(v);
Py_XDECREF(oldv);
break;
case Py_T_CHAR: {
const char *string;
Py_ssize_t len;
string = PyUnicode_AsUTF8AndSize(v, &len);
if (string == NULL || len != 1) {
PyErr_BadArgument();
return -1;
}
*(char*)addr = string[0];
break;
}
case Py_T_STRING:
case Py_T_STRING_INPLACE:
PyErr_SetString(PyExc_TypeError, "readonly attribute");
return -1;
case Py_T_LONGLONG:{
long long value;
*(long long*)addr = value = PyLong_AsLongLong(v);
if ((value == -1) && PyErr_Occurred())
return -1;
break;
}
case Py_T_ULONGLONG: {
v = _PyNumber_Index(v);
if (v == NULL) {
return -1;
}
if (_PyLong_IsNegative((PyLongObject *)v)) {
long long_val = PyLong_AsLong(v);
Py_DECREF(v);
if (long_val == -1 && PyErr_Occurred()) {
return -1;
}
*(unsigned long long *)addr = (unsigned long long)(long long)long_val;
WARN("Writing negative value into unsigned field");
}
else {
unsigned long long ulonglong_val = PyLong_AsUnsignedLongLong(v);
Py_DECREF(v);
if (ulonglong_val == (unsigned long long)-1 && PyErr_Occurred()) {
return -1;
}
*(unsigned long long*)addr = ulonglong_val;
}
break;
}
default:
PyErr_Format(PyExc_SystemError,
"bad memberdescr type for %s", l->name);
return -1;
}
return 0;
}
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