mirror of
https://github.com/python/cpython.git
synced 2025-10-31 13:41:24 +00:00
382 lines
12 KiB
C
382 lines
12 KiB
C
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/* Map C struct members to Python object attributes */
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#include "Python.h"
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#include "pycore_abstract.h" // _PyNumber_Index()
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#include "pycore_long.h" // _PyLong_IsNegative()
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#include "pycore_object.h" // _Py_TryIncrefCompare(), FT_ATOMIC_*()
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#include "pycore_critical_section.h"
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static inline PyObject *
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member_get_object(const char *addr, const char *obj_addr, PyMemberDef *l)
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{
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PyObject *v = FT_ATOMIC_LOAD_PTR(*(PyObject **) addr);
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if (v == NULL) {
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PyErr_Format(PyExc_AttributeError,
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"'%T' object has no attribute '%s'",
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(PyObject *)obj_addr, l->name);
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}
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return v;
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}
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PyObject *
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PyMember_GetOne(const char *obj_addr, PyMemberDef *l)
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{
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PyObject *v;
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if (l->flags & Py_RELATIVE_OFFSET) {
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PyErr_SetString(
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PyExc_SystemError,
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"PyMember_GetOne used with Py_RELATIVE_OFFSET");
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return NULL;
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}
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const char* addr = obj_addr + l->offset;
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switch (l->type) {
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case Py_T_BOOL:
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v = PyBool_FromLong(FT_ATOMIC_LOAD_CHAR_RELAXED(*(char*)addr));
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break;
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case Py_T_BYTE:
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v = PyLong_FromLong(FT_ATOMIC_LOAD_CHAR_RELAXED(*(char*)addr));
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break;
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case Py_T_UBYTE:
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v = PyLong_FromUnsignedLong(FT_ATOMIC_LOAD_UCHAR_RELAXED(*(unsigned char*)addr));
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break;
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case Py_T_SHORT:
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v = PyLong_FromLong(FT_ATOMIC_LOAD_SHORT_RELAXED(*(short*)addr));
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break;
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case Py_T_USHORT:
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v = PyLong_FromUnsignedLong(FT_ATOMIC_LOAD_USHORT_RELAXED(*(unsigned short*)addr));
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break;
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case Py_T_INT:
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v = PyLong_FromLong(FT_ATOMIC_LOAD_INT_RELAXED(*(int*)addr));
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break;
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case Py_T_UINT:
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v = PyLong_FromUnsignedLong(FT_ATOMIC_LOAD_UINT_RELAXED(*(unsigned int*)addr));
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break;
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case Py_T_LONG:
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v = PyLong_FromLong(FT_ATOMIC_LOAD_LONG_RELAXED(*(long*)addr));
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break;
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case Py_T_ULONG:
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v = PyLong_FromUnsignedLong(FT_ATOMIC_LOAD_ULONG_RELAXED(*(unsigned long*)addr));
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break;
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case Py_T_PYSSIZET:
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v = PyLong_FromSsize_t(FT_ATOMIC_LOAD_SSIZE_RELAXED(*(Py_ssize_t*)addr));
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break;
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case Py_T_FLOAT:
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v = PyFloat_FromDouble((double)FT_ATOMIC_LOAD_FLOAT_RELAXED(*(float*)addr));
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break;
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case Py_T_DOUBLE:
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v = PyFloat_FromDouble(FT_ATOMIC_LOAD_DOUBLE_RELAXED(*(double*)addr));
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break;
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case Py_T_STRING:
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if (*(char**)addr == NULL) {
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v = Py_NewRef(Py_None);
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}
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else
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v = PyUnicode_FromString(*(char**)addr);
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break;
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case Py_T_STRING_INPLACE:
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v = PyUnicode_FromString((char*)addr);
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break;
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case Py_T_CHAR: {
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char char_val = FT_ATOMIC_LOAD_CHAR_RELAXED(*addr);
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v = PyUnicode_FromStringAndSize(&char_val, 1);
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break;
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}
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case _Py_T_OBJECT:
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v = FT_ATOMIC_LOAD_PTR(*(PyObject **) addr);
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if (v != NULL) {
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#ifdef Py_GIL_DISABLED
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if (!_Py_TryIncrefCompare((PyObject **) addr, v)) {
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Py_BEGIN_CRITICAL_SECTION((PyObject *) obj_addr);
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v = FT_ATOMIC_LOAD_PTR(*(PyObject **) addr);
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Py_XINCREF(v);
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Py_END_CRITICAL_SECTION();
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}
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#else
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Py_INCREF(v);
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#endif
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}
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if (v == NULL) {
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v = Py_None;
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}
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break;
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case Py_T_OBJECT_EX:
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v = member_get_object(addr, obj_addr, l);
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#ifndef Py_GIL_DISABLED
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Py_XINCREF(v);
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#else
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if (v != NULL) {
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if (!_Py_TryIncrefCompare((PyObject **) addr, v)) {
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Py_BEGIN_CRITICAL_SECTION((PyObject *) obj_addr);
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v = member_get_object(addr, obj_addr, l);
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Py_XINCREF(v);
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Py_END_CRITICAL_SECTION();
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}
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}
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#endif
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break;
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case Py_T_LONGLONG:
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v = PyLong_FromLongLong(FT_ATOMIC_LOAD_LLONG_RELAXED(*(long long *)addr));
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break;
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case Py_T_ULONGLONG:
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v = PyLong_FromUnsignedLongLong(FT_ATOMIC_LOAD_ULLONG_RELAXED(*(unsigned long long *)addr));
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break;
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case _Py_T_NONE:
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// doesn't require free-threading code path
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v = Py_NewRef(Py_None);
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break;
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default:
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PyErr_SetString(PyExc_SystemError, "bad memberdescr type");
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v = NULL;
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}
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return v;
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}
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#define WARN(msg) \
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do { \
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if (PyErr_WarnEx(PyExc_RuntimeWarning, msg, 1) < 0) \
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return -1; \
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} while (0)
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int
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PyMember_SetOne(char *addr, PyMemberDef *l, PyObject *v)
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{
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PyObject *oldv;
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if (l->flags & Py_RELATIVE_OFFSET) {
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PyErr_SetString(
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PyExc_SystemError,
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"PyMember_SetOne used with Py_RELATIVE_OFFSET");
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return -1;
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}
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#ifdef Py_GIL_DISABLED
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PyObject *obj = (PyObject *) addr;
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#endif
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addr += l->offset;
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if ((l->flags & Py_READONLY))
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{
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PyErr_SetString(PyExc_AttributeError, "readonly attribute");
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return -1;
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}
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if (v == NULL) {
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if (l->type == Py_T_OBJECT_EX) {
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/* Check if the attribute is set. */
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if (*(PyObject **)addr == NULL) {
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PyErr_SetString(PyExc_AttributeError, l->name);
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return -1;
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}
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}
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else if (l->type != _Py_T_OBJECT) {
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PyErr_SetString(PyExc_TypeError,
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"can't delete numeric/char attribute");
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return -1;
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}
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}
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switch (l->type) {
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case Py_T_BOOL:{
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if (!PyBool_Check(v)) {
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PyErr_SetString(PyExc_TypeError,
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"attribute value type must be bool");
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return -1;
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}
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if (v == Py_True)
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FT_ATOMIC_STORE_CHAR_RELAXED(*(char*)addr, 1);
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else
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FT_ATOMIC_STORE_CHAR_RELAXED(*(char*)addr, 0);
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break;
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}
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case Py_T_BYTE:{
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long long_val = PyLong_AsLong(v);
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if ((long_val == -1) && PyErr_Occurred())
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return -1;
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FT_ATOMIC_STORE_CHAR_RELAXED(*(char*)addr, (char)long_val);
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/* XXX: For compatibility, only warn about truncations
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for now. */
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if ((long_val > CHAR_MAX) || (long_val < CHAR_MIN))
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WARN("Truncation of value to char");
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break;
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}
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case Py_T_UBYTE:{
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long long_val = PyLong_AsLong(v);
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if ((long_val == -1) && PyErr_Occurred())
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return -1;
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FT_ATOMIC_STORE_UCHAR_RELAXED(*(unsigned char*)addr, (unsigned char)long_val);
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if ((long_val > UCHAR_MAX) || (long_val < 0))
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WARN("Truncation of value to unsigned char");
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break;
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}
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case Py_T_SHORT:{
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long long_val = PyLong_AsLong(v);
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if ((long_val == -1) && PyErr_Occurred())
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return -1;
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FT_ATOMIC_STORE_SHORT_RELAXED(*(short*)addr, (short)long_val);
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if ((long_val > SHRT_MAX) || (long_val < SHRT_MIN))
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WARN("Truncation of value to short");
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break;
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}
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case Py_T_USHORT:{
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long long_val = PyLong_AsLong(v);
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if ((long_val == -1) && PyErr_Occurred())
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return -1;
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FT_ATOMIC_STORE_USHORT_RELAXED(*(unsigned short*)addr, (unsigned short)long_val);
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if ((long_val > USHRT_MAX) || (long_val < 0))
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WARN("Truncation of value to unsigned short");
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break;
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}
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case Py_T_INT:{
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long long_val = PyLong_AsLong(v);
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if ((long_val == -1) && PyErr_Occurred())
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return -1;
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FT_ATOMIC_STORE_INT_RELAXED(*(int *)addr, (int)long_val);
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if ((long_val > INT_MAX) || (long_val < INT_MIN))
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WARN("Truncation of value to int");
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break;
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}
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case Py_T_UINT: {
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/* XXX: For compatibility, accept negative int values
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as well. */
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v = _PyNumber_Index(v);
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if (v == NULL) {
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return -1;
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}
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if (_PyLong_IsNegative((PyLongObject *)v)) {
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long long_val = PyLong_AsLong(v);
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Py_DECREF(v);
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if (long_val == -1 && PyErr_Occurred()) {
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return -1;
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}
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FT_ATOMIC_STORE_UINT_RELAXED(*(unsigned int *)addr, (unsigned int)(unsigned long)long_val);
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WARN("Writing negative value into unsigned field");
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}
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else {
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unsigned long ulong_val = PyLong_AsUnsignedLong(v);
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Py_DECREF(v);
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if (ulong_val == (unsigned long)-1 && PyErr_Occurred()) {
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return -1;
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}
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FT_ATOMIC_STORE_UINT_RELAXED(*(unsigned int *)addr, (unsigned int)ulong_val);
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if (ulong_val > UINT_MAX) {
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WARN("Truncation of value to unsigned int");
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}
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}
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break;
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}
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case Py_T_LONG: {
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const long long_val = PyLong_AsLong(v);
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if ((long_val == -1) && PyErr_Occurred())
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return -1;
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FT_ATOMIC_STORE_LONG_RELAXED(*(long*)addr, long_val);
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break;
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}
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case Py_T_ULONG: {
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/* XXX: For compatibility, accept negative int values
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as well. */
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v = _PyNumber_Index(v);
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if (v == NULL) {
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return -1;
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}
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if (_PyLong_IsNegative((PyLongObject *)v)) {
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long long_val = PyLong_AsLong(v);
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Py_DECREF(v);
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if (long_val == -1 && PyErr_Occurred()) {
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return -1;
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}
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FT_ATOMIC_STORE_ULONG_RELAXED(*(unsigned long *)addr, (unsigned long)long_val);
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WARN("Writing negative value into unsigned field");
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}
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else {
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unsigned long ulong_val = PyLong_AsUnsignedLong(v);
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Py_DECREF(v);
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if (ulong_val == (unsigned long)-1 && PyErr_Occurred()) {
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return -1;
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}
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FT_ATOMIC_STORE_ULONG_RELAXED(*(unsigned long *)addr, ulong_val);
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}
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break;
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}
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case Py_T_PYSSIZET: {
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const Py_ssize_t ssize_val = PyLong_AsSsize_t(v);
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if ((ssize_val == (Py_ssize_t)-1) && PyErr_Occurred())
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return -1;
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FT_ATOMIC_STORE_SSIZE_RELAXED(*(Py_ssize_t*)addr, ssize_val);
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break;
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}
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case Py_T_FLOAT:{
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double double_val = PyFloat_AsDouble(v);
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if ((double_val == -1) && PyErr_Occurred())
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return -1;
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FT_ATOMIC_STORE_FLOAT_RELAXED(*(float*)addr, (float)double_val);
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break;
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}
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case Py_T_DOUBLE: {
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const double double_val = PyFloat_AsDouble(v);
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if ((double_val == -1) && PyErr_Occurred())
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return -1;
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FT_ATOMIC_STORE_DOUBLE_RELAXED(*(double *) addr, double_val);
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break;
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}
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case _Py_T_OBJECT:
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case Py_T_OBJECT_EX:
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Py_BEGIN_CRITICAL_SECTION(obj);
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oldv = *(PyObject **)addr;
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FT_ATOMIC_STORE_PTR_RELEASE(*(PyObject **)addr, Py_XNewRef(v));
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Py_END_CRITICAL_SECTION();
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Py_XDECREF(oldv);
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break;
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case Py_T_CHAR: {
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const char *string;
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Py_ssize_t len;
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string = PyUnicode_AsUTF8AndSize(v, &len);
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if (string == NULL || len != 1) {
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PyErr_BadArgument();
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return -1;
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}
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FT_ATOMIC_STORE_CHAR_RELAXED(*(char*)addr, string[0]);
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break;
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}
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case Py_T_STRING:
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case Py_T_STRING_INPLACE:
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PyErr_SetString(PyExc_TypeError, "readonly attribute");
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return -1;
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case Py_T_LONGLONG:{
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long long value = PyLong_AsLongLong(v);
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if ((value == -1) && PyErr_Occurred())
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return -1;
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FT_ATOMIC_STORE_LLONG_RELAXED(*(long long*)addr, value);
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break;
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}
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case Py_T_ULONGLONG: {
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v = _PyNumber_Index(v);
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if (v == NULL) {
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return -1;
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}
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if (_PyLong_IsNegative((PyLongObject *)v)) {
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long long_val = PyLong_AsLong(v);
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Py_DECREF(v);
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if (long_val == -1 && PyErr_Occurred()) {
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return -1;
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}
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FT_ATOMIC_STORE_ULLONG_RELAXED(*(unsigned long long *)addr, (unsigned long long)(long long)long_val);
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WARN("Writing negative value into unsigned field");
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}
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else {
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unsigned long long ulonglong_val = PyLong_AsUnsignedLongLong(v);
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Py_DECREF(v);
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if (ulonglong_val == (unsigned long long)-1 && PyErr_Occurred()) {
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return -1;
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}
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FT_ATOMIC_STORE_ULLONG_RELAXED(*(unsigned long long *)addr, ulonglong_val);
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}
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break;
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}
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default:
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PyErr_Format(PyExc_SystemError,
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"bad memberdescr type for %s", l->name);
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return -1;
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}
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return 0;
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}
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