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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()
#include "pycore_object.h" // _Py_TryIncrefCompare(), FT_ATOMIC_*()
#include "pycore_critical_section.h"
static inline PyObject *
member_get_object(const char *addr, const char *obj_addr, PyMemberDef *l)
{
PyObject *v = FT_ATOMIC_LOAD_PTR(*(PyObject **) addr);
if (v == NULL) {
PyErr_Format(PyExc_AttributeError,
"'%T' object has no attribute '%s'",
(PyObject *)obj_addr, l->name);
}
return v;
}
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(FT_ATOMIC_LOAD_CHAR_RELAXED(*(char*)addr));
break;
case Py_T_BYTE:
v = PyLong_FromLong(FT_ATOMIC_LOAD_CHAR_RELAXED(*(char*)addr));
break;
case Py_T_UBYTE:
v = PyLong_FromUnsignedLong(FT_ATOMIC_LOAD_UCHAR_RELAXED(*(unsigned char*)addr));
break;
case Py_T_SHORT:
v = PyLong_FromLong(FT_ATOMIC_LOAD_SHORT_RELAXED(*(short*)addr));
break;
case Py_T_USHORT:
v = PyLong_FromUnsignedLong(FT_ATOMIC_LOAD_USHORT_RELAXED(*(unsigned short*)addr));
break;
case Py_T_INT:
v = PyLong_FromLong(FT_ATOMIC_LOAD_INT_RELAXED(*(int*)addr));
break;
case Py_T_UINT:
v = PyLong_FromUnsignedLong(FT_ATOMIC_LOAD_UINT_RELAXED(*(unsigned int*)addr));
break;
case Py_T_LONG:
v = PyLong_FromLong(FT_ATOMIC_LOAD_LONG_RELAXED(*(long*)addr));
break;
case Py_T_ULONG:
v = PyLong_FromUnsignedLong(FT_ATOMIC_LOAD_ULONG_RELAXED(*(unsigned long*)addr));
break;
case Py_T_PYSSIZET:
v = PyLong_FromSsize_t(FT_ATOMIC_LOAD_SSIZE_RELAXED(*(Py_ssize_t*)addr));
break;
case Py_T_FLOAT:
v = PyFloat_FromDouble((double)FT_ATOMIC_LOAD_FLOAT_RELAXED(*(float*)addr));
break;
case Py_T_DOUBLE:
v = PyFloat_FromDouble(FT_ATOMIC_LOAD_DOUBLE_RELAXED(*(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: {
char char_val = FT_ATOMIC_LOAD_CHAR_RELAXED(*addr);
v = PyUnicode_FromStringAndSize(&char_val, 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 = member_get_object(addr, obj_addr, l);
#ifndef Py_GIL_DISABLED
Py_XINCREF(v);
#else
if (v != NULL) {
if (!_Py_TryIncrefCompare((PyObject **) addr, v)) {
Py_BEGIN_CRITICAL_SECTION((PyObject *) obj_addr);
v = member_get_object(addr, obj_addr, l);
Py_XINCREF(v);
Py_END_CRITICAL_SECTION();
}
}
#endif
break;
case Py_T_LONGLONG:
v = PyLong_FromLongLong(FT_ATOMIC_LOAD_LLONG_RELAXED(*(long long *)addr));
break;
case Py_T_ULONGLONG:
v = PyLong_FromUnsignedLongLong(FT_ATOMIC_LOAD_ULLONG_RELAXED(*(unsigned long long *)addr));
break;
case _Py_T_NONE:
// doesn't require free-threading code path
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;
}
#ifdef Py_GIL_DISABLED
PyObject *obj = (PyObject *) addr;
#endif
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)
FT_ATOMIC_STORE_CHAR_RELAXED(*(char*)addr, 1);
else
FT_ATOMIC_STORE_CHAR_RELAXED(*(char*)addr, 0);
break;
}
case Py_T_BYTE:{
long long_val = PyLong_AsLong(v);
if ((long_val == -1) && PyErr_Occurred())
return -1;
FT_ATOMIC_STORE_CHAR_RELAXED(*(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;
FT_ATOMIC_STORE_UCHAR_RELAXED(*(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;
FT_ATOMIC_STORE_SHORT_RELAXED(*(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;
FT_ATOMIC_STORE_USHORT_RELAXED(*(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;
FT_ATOMIC_STORE_INT_RELAXED(*(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;
}
FT_ATOMIC_STORE_UINT_RELAXED(*(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;
}
FT_ATOMIC_STORE_UINT_RELAXED(*(unsigned int *)addr, (unsigned int)ulong_val);
if (ulong_val > UINT_MAX) {
WARN("Truncation of value to unsigned int");
}
}
break;
}
case Py_T_LONG: {
const long long_val = PyLong_AsLong(v);
if ((long_val == -1) && PyErr_Occurred())
return -1;
FT_ATOMIC_STORE_LONG_RELAXED(*(long*)addr, long_val);
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;
}
FT_ATOMIC_STORE_ULONG_RELAXED(*(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;
}
FT_ATOMIC_STORE_ULONG_RELAXED(*(unsigned long *)addr, ulong_val);
}
break;
}
case Py_T_PYSSIZET: {
const Py_ssize_t ssize_val = PyLong_AsSsize_t(v);
if ((ssize_val == (Py_ssize_t)-1) && PyErr_Occurred())
return -1;
FT_ATOMIC_STORE_SSIZE_RELAXED(*(Py_ssize_t*)addr, ssize_val);
break;
}
case Py_T_FLOAT:{
double double_val = PyFloat_AsDouble(v);
if ((double_val == -1) && PyErr_Occurred())
return -1;
FT_ATOMIC_STORE_FLOAT_RELAXED(*(float*)addr, (float)double_val);
break;
}
case Py_T_DOUBLE: {
const double double_val = PyFloat_AsDouble(v);
if ((double_val == -1) && PyErr_Occurred())
return -1;
FT_ATOMIC_STORE_DOUBLE_RELAXED(*(double *) addr, double_val);
break;
}
case _Py_T_OBJECT:
case Py_T_OBJECT_EX:
Py_BEGIN_CRITICAL_SECTION(obj);
oldv = *(PyObject **)addr;
FT_ATOMIC_STORE_PTR_RELEASE(*(PyObject **)addr, Py_XNewRef(v));
Py_END_CRITICAL_SECTION();
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;
}
FT_ATOMIC_STORE_CHAR_RELAXED(*(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 = PyLong_AsLongLong(v);
if ((value == -1) && PyErr_Occurred())
return -1;
FT_ATOMIC_STORE_LLONG_RELAXED(*(long long*)addr, value);
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;
}
FT_ATOMIC_STORE_ULLONG_RELAXED(*(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;
}
FT_ATOMIC_STORE_ULLONG_RELAXED(*(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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