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cfield.c
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#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
// windows.h must be included before pycore internal headers
#ifdef MS_WIN32
# include <windows.h>
#endif
#include "pycore_bitutils.h" // _Py_bswap32()
#include "pycore_call.h" // _PyObject_CallNoArgs()
#include <ffi.h>
#include "ctypes.h"
#if defined(Py_HAVE_C_COMPLEX) && defined(Py_FFI_SUPPORT_C_COMPLEX)
# include "../_complex.h" // complex
#endif
#define CTYPES_CFIELD_CAPSULE_NAME_PYMEM "_ctypes/cfield.c pymem"
/*[clinic input]
module _ctypes
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=476a19c49b31a75c]*/
#include "clinic/cfield.c.h"
static void pymem_destructor(PyObject *ptr)
{
void *p = PyCapsule_GetPointer(ptr, CTYPES_CFIELD_CAPSULE_NAME_PYMEM);
if (p) {
PyMem_Free(p);
}
}
/******************************************************************/
/*
PyCField_Type
*/
/*[clinic input]
class _ctypes.CField "PyObject *" "PyObject"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=602817ea3ffc709c]*/
static inline
Py_ssize_t NUM_BITS(Py_ssize_t bitsize);
static inline
Py_ssize_t LOW_BIT(Py_ssize_t offset);
/*[clinic input]
@classmethod
_ctypes.CField.__new__ as PyCField_new
*
name: object(subclass_of='&PyUnicode_Type')
type as proto: object
byte_size: Py_ssize_t
byte_offset: Py_ssize_t
index: Py_ssize_t
_internal_use: bool
bit_size as bit_size_obj: object = None
bit_offset as bit_offset_obj: object = None
[clinic start generated code]*/
static PyObject *
PyCField_new_impl(PyTypeObject *type, PyObject *name, PyObject *proto,
Py_ssize_t byte_size, Py_ssize_t byte_offset,
Py_ssize_t index, int _internal_use,
PyObject *bit_size_obj, PyObject *bit_offset_obj)
/*[clinic end generated code: output=3f2885ee4108b6e2 input=b343436e33c0d782]*/
{
CFieldObject* self = NULL;
if (!_internal_use) {
// Do not instantiate outside ctypes, yet.
// The constructor is internal API and may change without warning.
PyErr_Format(PyExc_TypeError, "cannot create %T object", type);
goto error;
}
if (byte_size < 0) {
PyErr_Format(PyExc_ValueError,
"byte size of field %R must not be negative, got %zd",
name, byte_size);
goto error;
}
ctypes_state *st = get_module_state_by_class(type);
StgInfo *info;
if (PyStgInfo_FromType(st, proto, &info) < 0) {
goto error;
}
if (info == NULL) {
PyErr_Format(PyExc_TypeError,
"type of field %R must be a C type", name);
goto error;
}
assert(byte_size == info->size);
Py_ssize_t bitfield_size = 0;
Py_ssize_t bit_offset = 0;
if (bit_size_obj != Py_None) {
// It's a bit field!
switch(info->ffi_type_pointer.type) {
case FFI_TYPE_UINT8:
case FFI_TYPE_UINT16:
case FFI_TYPE_UINT32:
case FFI_TYPE_SINT64:
case FFI_TYPE_UINT64:
break;
case FFI_TYPE_SINT8:
case FFI_TYPE_SINT16:
case FFI_TYPE_SINT32:
if (info->getfunc != _ctypes_get_fielddesc("c")->getfunc
&& info->getfunc != _ctypes_get_fielddesc("u")->getfunc)
{
break;
}
_Py_FALLTHROUGH; /* else fall through */
default:
PyErr_Format(PyExc_TypeError,
"bit fields not allowed for type %s",
((PyTypeObject*)proto)->tp_name);
goto error;
}
if (byte_size > 100) {
// Bitfields must "live" in a field defined by a ffi type,
// so they're limited to about 8 bytes.
// This check is here to avoid overflow in later checks.
PyErr_Format(PyExc_ValueError,
"bit field %R size too large, got %zd",
name, byte_size);
goto error;
}
bitfield_size = PyLong_AsSsize_t(bit_size_obj);
if ((bitfield_size <= 0) || (bitfield_size > 255)) {
if (!PyErr_Occurred()) {
PyErr_Format(PyExc_ValueError,
"bit size of field %R out of range, got %zd",
name, bitfield_size);
}
goto error;
}
bit_offset = PyLong_AsSsize_t(bit_offset_obj);
if ((bit_offset < 0) || (bit_offset > 255)) {
if (!PyErr_Occurred()) {
PyErr_Format(PyExc_ValueError,
"bit offset of field %R out of range, got %zd",
name, bit_offset);
}
goto error;
}
if ((bitfield_size + bit_offset) > byte_size * 8) {
PyErr_Format(
PyExc_ValueError,
"bit field %R overflows its type (%zd + %zd >= %zd)",
name, bit_offset, byte_size*8);
goto error;
}
}
else {
if (bit_offset_obj != Py_None) {
PyErr_Format(
PyExc_ValueError,
"field %R: bit_offset must be specified if bit_size is",
name);
goto error;
}
}
self = _CFieldObject_CAST(type->tp_alloc(type, 0));
if (!self) {
return NULL;
}
self->name = PyUnicode_FromObject(name);
if (!self->name) {
goto error;
}
assert(PyUnicode_CheckExact(self->name));
self->proto = Py_NewRef(proto);
self->byte_size = byte_size;
self->byte_offset = byte_offset;
self->bitfield_size = (uint8_t)bitfield_size;
self->bit_offset = (uint8_t)bit_offset;
self->index = index;
/* Field descriptors for 'c_char * n' are be special cased to
return a Python string instead of an Array object instance...
*/
self->setfunc = NULL;
self->getfunc = NULL;
if (PyCArrayTypeObject_Check(st, proto)) {
StgInfo *ainfo;
if (PyStgInfo_FromType(st, proto, &ainfo) < 0) {
goto error;
}
if (ainfo && ainfo->proto) {
StgInfo *iinfo;
if (PyStgInfo_FromType(st, ainfo->proto, &iinfo) < 0) {
goto error;
}
if (!iinfo) {
PyErr_SetString(PyExc_TypeError,
"has no _stginfo_");
goto error;
}
if (iinfo->getfunc == _ctypes_get_fielddesc("c")->getfunc) {
struct fielddesc *fd = _ctypes_get_fielddesc("s");
self->getfunc = fd->getfunc;
self->setfunc = fd->setfunc;
}
if (iinfo->getfunc == _ctypes_get_fielddesc("u")->getfunc) {
struct fielddesc *fd = _ctypes_get_fielddesc("U");
self->getfunc = fd->getfunc;
self->setfunc = fd->setfunc;
}
}
}
return (PyObject *)self;
error:
Py_XDECREF(self);
return NULL;
}
static inline Py_ssize_t
_pack_legacy_size(CFieldObject *field)
{
if (field->bitfield_size) {
Py_ssize_t bit_offset = field->bit_offset;
return (field->bitfield_size << 16) | bit_offset;
}
return field->byte_size;
}
static int
PyCField_set(PyObject *op, PyObject *inst, PyObject *value)
{
CDataObject *dst;
char *ptr;
CFieldObject *self = _CFieldObject_CAST(op);
ctypes_state *st = get_module_state_by_class(Py_TYPE(self));
if (!CDataObject_Check(st, inst)) {
PyErr_SetString(PyExc_TypeError,
"not a ctype instance");
return -1;
}
dst = _CDataObject_CAST(inst);
ptr = dst->b_ptr + self->byte_offset;
if (value == NULL) {
PyErr_SetString(PyExc_TypeError,
"can't delete attribute");
return -1;
}
return PyCData_set(st, inst, self->proto, self->setfunc, value,
self->index, _pack_legacy_size(self), ptr);
}
static PyObject *
PyCField_get(PyObject *op, PyObject *inst, PyObject *type)
{
CDataObject *src;
CFieldObject *self = _CFieldObject_CAST(op);
if (inst == NULL) {
return Py_NewRef(self);
}
ctypes_state *st = get_module_state_by_class(Py_TYPE(self));
if (!CDataObject_Check(st, inst)) {
PyErr_SetString(PyExc_TypeError,
"not a ctype instance");
return NULL;
}
src = _CDataObject_CAST(inst);
return PyCData_get(st, self->proto, self->getfunc, inst,
self->index, _pack_legacy_size(self),
src->b_ptr + self->byte_offset);
}
static PyObject *
PyCField_get_legacy_size(PyObject *self, void *Py_UNUSED(closure))
{
CFieldObject *field = _CFieldObject_CAST(self);
return PyLong_FromSsize_t(_pack_legacy_size(field));
}
static PyObject *
PyCField_get_bit_size(PyObject *self, void *Py_UNUSED(closure))
{
CFieldObject *field = _CFieldObject_CAST(self);
if (field->bitfield_size) {
return PyLong_FromSsize_t(field->bitfield_size);
}
if (field->byte_size < PY_SSIZE_T_MAX / 8) {
return PyLong_FromSsize_t(field->byte_size * 8);
}
// If the bit size overflows Py_ssize_t, we don't try fitting it in
// a bigger C type. Use Python ints.
PyObject *byte_size_obj = NULL;
PyObject *eight = NULL;
PyObject *result = NULL;
byte_size_obj = PyLong_FromSsize_t(field->byte_size);
if (!byte_size_obj) {
goto finally;
}
eight = PyLong_FromLong(8);
if (!eight) {
goto finally;
}
result = PyNumber_Multiply(byte_size_obj, eight);
finally:
Py_XDECREF(byte_size_obj);
Py_XDECREF(eight);
return result;
}
static PyObject *
PyCField_is_bitfield(PyObject *self, void *Py_UNUSED(closure))
{
return PyBool_FromLong(_CFieldObject_CAST(self)->bitfield_size);
}
static PyObject *
PyCField_is_anonymous(PyObject *self, void *Py_UNUSED(closure))
{
return PyBool_FromLong(_CFieldObject_CAST(self)->anonymous);
}
static PyGetSetDef PyCField_getset[] = {
{ "size", PyCField_get_legacy_size, NULL,
PyDoc_STR("size in bytes of this field. For bitfields, this is a "
"legacy packed value; use byte_size instead") },
{ "bit_size", PyCField_get_bit_size, NULL,
PyDoc_STR("size of this field in bits") },
{ "is_bitfield", PyCField_is_bitfield, NULL,
PyDoc_STR("true if this is a bitfield") },
{ "is_anonymous", PyCField_is_anonymous, NULL,
PyDoc_STR("true if this field is anonymous") },
{ NULL },
};
static PyMemberDef PyCField_members[] = {
{ "name",
.type = Py_T_OBJECT_EX,
.offset = offsetof(CFieldObject, name),
.flags = Py_READONLY,
.doc = PyDoc_STR("name of this field") },
{ "type",
.type = Py_T_OBJECT_EX,
.offset = offsetof(CFieldObject, proto),
.flags = Py_READONLY,
.doc = PyDoc_STR("type of this field") },
{ "offset",
.type = Py_T_PYSSIZET,
.offset = offsetof(CFieldObject, byte_offset),
.flags = Py_READONLY,
.doc = PyDoc_STR(
"offset in bytes of this field (same as byte_offset)") },
{ "byte_offset",
.type = Py_T_PYSSIZET,
.offset = offsetof(CFieldObject, byte_offset),
.flags = Py_READONLY,
.doc = PyDoc_STR("offset in bytes of this field. "
"For bitfields: excludes bit_offset.") },
{ "byte_size",
.type = Py_T_PYSSIZET,
.offset = offsetof(CFieldObject, byte_size),
.flags = Py_READONLY,
.doc = PyDoc_STR("size of this field in bytes") },
{ "bit_offset",
.type = Py_T_UBYTE,
.offset = offsetof(CFieldObject, bit_offset),
.flags = Py_READONLY,
.doc = PyDoc_STR("additional offset in bits (relative to byte_offset);"
" zero for non-bitfields") },
{ NULL },
};
static int
PyCField_traverse(PyObject *op, visitproc visit, void *arg)
{
CFieldObject *self = _CFieldObject_CAST(op);
Py_VISIT(Py_TYPE(self));
Py_VISIT(self->proto);
return 0;
}
static int
PyCField_clear(PyObject *op)
{
CFieldObject *self = _CFieldObject_CAST(op);
Py_CLEAR(self->proto);
Py_CLEAR(self->name);
return 0;
}
static void
PyCField_dealloc(PyObject *self)
{
PyTypeObject *tp = Py_TYPE(self);
PyObject_GC_UnTrack(self);
(void)PyCField_clear(self);
Py_TYPE(self)->tp_free(self);
Py_DECREF(tp);
}
static PyObject *
PyCField_repr(PyObject *self)
{
CFieldObject *field = _CFieldObject_CAST(self);
PyObject *result;
const char *tp_name = ((PyTypeObject *)field->proto)->tp_name;
if (field->bitfield_size) {
result = PyUnicode_FromFormat(
"<%T %R type=%s, ofs=%zd, bit_size=%zd, bit_offset=%zd>",
self,
field->name, tp_name, field->byte_offset,
(Py_ssize_t)field->bitfield_size,
(Py_ssize_t)field->bit_offset);
}
else {
result = PyUnicode_FromFormat(
"<%T %R type=%s, ofs=%zd, size=%zd>",
self,
field->name, tp_name, field->byte_offset,
field->byte_size);
}
return result;
}
static PyType_Slot cfield_slots[] = {
{Py_tp_new, PyCField_new},
{Py_tp_dealloc, PyCField_dealloc},
{Py_tp_repr, PyCField_repr},
{Py_tp_doc, (void *)PyDoc_STR("Structure/Union member")},
{Py_tp_traverse, PyCField_traverse},
{Py_tp_clear, PyCField_clear},
{Py_tp_getset, PyCField_getset},
{Py_tp_members, PyCField_members},
{Py_tp_descr_get, PyCField_get},
{Py_tp_descr_set, PyCField_set},
{0, NULL},
};
PyType_Spec cfield_spec = {
.name = "ctypes.CField",
.basicsize = sizeof(CFieldObject),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_IMMUTABLETYPE),
.slots = cfield_slots,
};
/*****************************************************************
* Integer fields, with bitfield support
*/
/* how to decode the size field, for integer get/set functions */
static inline
Py_ssize_t LOW_BIT(Py_ssize_t offset) {
return offset & 0xFFFF;
}
static inline
Py_ssize_t NUM_BITS(Py_ssize_t bitsize) {
return bitsize >> 16;
}
/* Doesn't work if NUM_BITS(size) == 0, but it never happens in SET() call. */
#define BIT_MASK(type, size) (((((type)1 << (NUM_BITS(size) - 1)) - 1) << 1) + 1)
/* This macro CHANGES the first parameter IN PLACE. For proper sign handling,
we must first shift left, then right.
*/
#define GET_BITFIELD(v, size) \
if (NUM_BITS(size)) { \
v <<= (sizeof(v)*8 - LOW_BIT(size) - NUM_BITS(size)); \
v >>= (sizeof(v)*8 - NUM_BITS(size)); \
}
/* This macro RETURNS the first parameter with the bit field CHANGED. */
#define SET(type, x, v, size) \
(NUM_BITS(size) ? \
( ( (type)(x) & ~(BIT_MASK(type, size) << LOW_BIT(size)) ) | ( ((type)(v) & BIT_MASK(type, size)) << LOW_BIT(size) ) ) \
: (type)(v))
/*****************************************************************
* The setter methods return an object which must be kept alive, to keep the
* data valid which has been stored in the memory block. The ctypes object
* instance inserts this object into its 'b_objects' list.
*
* For simple Python types like integers or characters, there is nothing that
* has to been kept alive, so Py_None is returned in these cases. But this
* makes inspecting the 'b_objects' list, which is accessible from Python for
* debugging, less useful.
*
* So, defining the _CTYPES_DEBUG_KEEP symbol returns the original value
* instead of Py_None.
*/
#ifdef _CTYPES_DEBUG_KEEP
#define _RET(x) Py_INCREF(x); return x
#else
#define _RET(X) Py_RETURN_NONE
#endif
/*****************************************************************
* accessor methods for fixed-width integers (e.g. int8_t, uint64_t),
* supporting bit fields.
* These are named e.g. `i8_set`/`i8_get` or `u64_set`/`u64_get`,
* and are all alike, so they're defined using a macro.
*/
#define FIXINT_GETSET(TAG, CTYPE, NBITS, PYAPI_FROMFUNC) \
static PyObject * \
TAG ## _set(void *ptr, PyObject *value, Py_ssize_t size_arg) \
{ \
assert(NUM_BITS(size_arg) || (size_arg == (NBITS) / 8)); \
CTYPE val; \
if (PyLong_Check(value) \
&& PyUnstable_Long_IsCompact((PyLongObject *)value)) \
{ \
val = (CTYPE)PyUnstable_Long_CompactValue( \
(PyLongObject *)value); \
} \
else { \
Py_ssize_t res = PyLong_AsNativeBytes( \
value, &val, (NBITS) / 8, \
Py_ASNATIVEBYTES_NATIVE_ENDIAN \
| Py_ASNATIVEBYTES_ALLOW_INDEX); \
if (res < 0) { \
return NULL; \
} \
} \
CTYPE prev; \
memcpy(&prev, ptr, (NBITS) / 8); \
val = SET(CTYPE, prev, val, size_arg); \
memcpy(ptr, &val, (NBITS) / 8); \
_RET(value); \
} \
\
static PyObject * \
TAG ## _get(void *ptr, Py_ssize_t size_arg) \
{ \
assert(NUM_BITS(size_arg) || (size_arg == (NBITS) / 8)); \
CTYPE val; \
memcpy(&val, ptr, sizeof(val)); \
GET_BITFIELD(val, size_arg); \
return PYAPI_FROMFUNC(val); \
} \
///////////////////////////////////////////////////////////////////////////
/* Another macro for byte-swapped variants (e.g. `i8_set_sw`/`i8_get_sw`) */
#define FIXINT_GETSET_SW(TAG, CTYPE, NBITS, PYAPI_FROMFUNC, PY_SWAPFUNC) \
static PyObject * \
TAG ## _set_sw(void *ptr, PyObject *value, Py_ssize_t size_arg) \
{ \
CTYPE val; \
PyObject *res = TAG ## _set(&val, value, (NBITS) / 8); \
if (res == NULL) { \
return NULL; \
} \
Py_DECREF(res); \
CTYPE field; \
memcpy(&field, ptr, sizeof(field)); \
field = PY_SWAPFUNC(field); \
field = SET(CTYPE, field, val, size_arg); \
field = PY_SWAPFUNC(field); \
memcpy(ptr, &field, sizeof(field)); \
_RET(value); \
} \
\
static PyObject * \
TAG ## _get_sw(void *ptr, Py_ssize_t size_arg) \
{ \
assert(NUM_BITS(size_arg) || (size_arg == (NBITS) / 8)); \
CTYPE val; \
memcpy(&val, ptr, sizeof(val)); \
val = PY_SWAPFUNC(val); \
GET_BITFIELD(val, size_arg); \
return PYAPI_FROMFUNC(val); \
} \
///////////////////////////////////////////////////////////////////////////
/* These macros are expanded for all supported combinations of byte sizes
* (1, 2, 4, 8), signed and unsigned, native and swapped byteorder.
* That's a lot, so generate the list with Argument Clinic (`make clinic`).
*/
/*[python input]
for nbits in 8, 16, 32, 64:
for sgn in 'i', 'u':
u = 'u' if sgn == 'u' else ''
U = u.upper()
apibits = max(nbits, 32)
parts = [
f'{sgn}{nbits}',
f'{u}int{nbits}_t',
f'{nbits}',
f'PyLong_From{U}Int{apibits}',
]
print(f'FIXINT_GETSET({", ".join(parts)})')
if nbits > 8:
parts.append(f'_Py_bswap{nbits}')
print(f'FIXINT_GETSET_SW({", ".join(parts)})')
[python start generated code]*/
FIXINT_GETSET(i8, int8_t, 8, PyLong_FromInt32)
FIXINT_GETSET(u8, uint8_t, 8, PyLong_FromUInt32)
FIXINT_GETSET(i16, int16_t, 16, PyLong_FromInt32)
FIXINT_GETSET_SW(i16, int16_t, 16, PyLong_FromInt32, _Py_bswap16)
FIXINT_GETSET(u16, uint16_t, 16, PyLong_FromUInt32)
FIXINT_GETSET_SW(u16, uint16_t, 16, PyLong_FromUInt32, _Py_bswap16)
FIXINT_GETSET(i32, int32_t, 32, PyLong_FromInt32)
FIXINT_GETSET_SW(i32, int32_t, 32, PyLong_FromInt32, _Py_bswap32)
FIXINT_GETSET(u32, uint32_t, 32, PyLong_FromUInt32)
FIXINT_GETSET_SW(u32, uint32_t, 32, PyLong_FromUInt32, _Py_bswap32)
FIXINT_GETSET(i64, int64_t, 64, PyLong_FromInt64)
FIXINT_GETSET_SW(i64, int64_t, 64, PyLong_FromInt64, _Py_bswap64)
FIXINT_GETSET(u64, uint64_t, 64, PyLong_FromUInt64)
FIXINT_GETSET_SW(u64, uint64_t, 64, PyLong_FromUInt64, _Py_bswap64)
/*[python end generated code: output=3d60c96fa58e07d5 input=0b7e166f2ea18e70]*/
// For one-byte types, swapped variants are the same as native
#define i8_set_sw i8_set
#define i8_get_sw i8_get
#define u8_set_sw u8_set
#define u8_get_sw u8_get
#undef FIXINT_GETSET
#undef FIXINT_GETSET_SW
/*****************************************************************
* non-integer accessor methods, not supporting bit fields
*/
#ifndef MS_WIN32
/* http://msdn.microsoft.com/en-us/library/cc237864.aspx */
#define VARIANT_FALSE 0x0000
#define VARIANT_TRUE 0xFFFF
#endif
/* v: short BOOL - VARIANT_BOOL */
static PyObject *
v_set(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(short int)));
switch (PyObject_IsTrue(value)) {
case -1:
return NULL;
case 0:
*(short int *)ptr = VARIANT_FALSE;
_RET(value);
default:
*(short int *)ptr = VARIANT_TRUE;
_RET(value);
}
}
static PyObject *
v_get(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(short int)));
return PyBool_FromLong((long)*(short int *)ptr);
}
/* bool ('?'): bool (i.e. _Bool) */
static PyObject *
bool_set(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(bool)));
switch (PyObject_IsTrue(value)) {
case -1:
return NULL;
case 0:
*(bool *)ptr = 0;
_RET(value);
default:
*(bool *)ptr = 1;
_RET(value);
}
}
static PyObject *
bool_get(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(bool)));
return PyBool_FromLong((long)*(bool *)ptr);
}
/* g: long double */
static PyObject *
g_set(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(long double)));
long double x;
x = PyFloat_AsDouble(value);
if (x == -1 && PyErr_Occurred())
return NULL;
memcpy(ptr, &x, sizeof(long double));
_RET(value);
}
static PyObject *
g_get(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(long double)));
long double val;
memcpy(&val, ptr, sizeof(long double));
return PyFloat_FromDouble(val);
}
/* d: double */
static PyObject *
d_set(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(double)));
double x;
x = PyFloat_AsDouble(value);
if (x == -1 && PyErr_Occurred())
return NULL;
memcpy(ptr, &x, sizeof(double));
_RET(value);
}
static PyObject *
d_get(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(double)));
double val;
memcpy(&val, ptr, sizeof(val));
return PyFloat_FromDouble(val);
}
#if defined(Py_HAVE_C_COMPLEX) && defined(Py_FFI_SUPPORT_C_COMPLEX)
/* C: double complex */
static PyObject *
C_set(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(double complex)));
Py_complex c = PyComplex_AsCComplex(value);
if (c.real == -1 && PyErr_Occurred()) {
return NULL;
}
double complex x = CMPLX(c.real, c.imag);
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
static PyObject *
C_get(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(double complex)));
double complex x;
memcpy(&x, ptr, sizeof(x));
return PyComplex_FromDoubles(creal(x), cimag(x));
}
/* E: float complex */
static PyObject *
E_set(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(float complex)));
Py_complex c = PyComplex_AsCComplex(value);
if (c.real == -1 && PyErr_Occurred()) {
return NULL;
}
float complex x = CMPLXF((float)c.real, (float)c.imag);
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
static PyObject *
E_get(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(float complex)));
float complex x;
memcpy(&x, ptr, sizeof(x));
return PyComplex_FromDoubles(crealf(x), cimagf(x));
}
/* F: long double complex */
static PyObject *
F_set(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(long double complex)));
Py_complex c = PyComplex_AsCComplex(value);
if (c.real == -1 && PyErr_Occurred()) {
return NULL;
}
long double complex x = CMPLXL(c.real, c.imag);
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
static PyObject *
F_get(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(long double complex)));
long double complex x;
memcpy(&x, ptr, sizeof(x));
return PyComplex_FromDoubles((double)creall(x), (double)cimagl(x));
}
#endif
/* d: double */
static PyObject *
d_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(double)));
double x;
x = PyFloat_AsDouble(value);
if (x == -1 && PyErr_Occurred())
return NULL;
#ifdef WORDS_BIGENDIAN
if (PyFloat_Pack8(x, ptr, 1))
return NULL;
#else
if (PyFloat_Pack8(x, ptr, 0))
return NULL;
#endif
_RET(value);
}
static PyObject *
d_get_sw(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(double)));
#ifdef WORDS_BIGENDIAN
return PyFloat_FromDouble(PyFloat_Unpack8(ptr, 1));
#else
return PyFloat_FromDouble(PyFloat_Unpack8(ptr, 0));
#endif
}
/* f: float */
static PyObject *
f_set(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(float)));
float x;
x = (float)PyFloat_AsDouble(value);
if (x == -1 && PyErr_Occurred())
return NULL;
memcpy(ptr, &x, sizeof(x));
_RET(value);
}
static PyObject *
f_get(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(float)));
float val;
memcpy(&val, ptr, sizeof(val));
return PyFloat_FromDouble(val);
}
static PyObject *
f_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(float)));
float x;
x = (float)PyFloat_AsDouble(value);
if (x == -1 && PyErr_Occurred())
return NULL;
#ifdef WORDS_BIGENDIAN
if (PyFloat_Pack4(x, ptr, 1))
return NULL;
#else
if (PyFloat_Pack4(x, ptr, 0))
return NULL;
#endif
_RET(value);
}
static PyObject *
f_get_sw(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(float)));
#ifdef WORDS_BIGENDIAN
return PyFloat_FromDouble(PyFloat_Unpack4(ptr, 1));
#else
return PyFloat_FromDouble(PyFloat_Unpack4(ptr, 0));
#endif
}
/* O: Python object */
/*
py_object refcounts:
1. If we have a py_object instance, O_get must Py_INCREF the returned
object, of course. If O_get is called from a function result, no py_object
instance is created - so callproc.c::GetResult has to call Py_DECREF.
2. The memory block in py_object owns a refcount. So, py_object must call
Py_DECREF on destruction. Maybe only when b_needsfree is non-zero.
*/
static PyObject *
O_get(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(PyObject *)));
PyObject *ob = *(PyObject **)ptr;
if (ob == NULL) {
if (!PyErr_Occurred())
/* Set an error if not yet set */
PyErr_SetString(PyExc_ValueError,
"PyObject is NULL");
return NULL;
}
return Py_NewRef(ob);
}
static PyObject *
O_set(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(PyObject *)));
/* Hm, does the memory block need it's own refcount or not? */
*(PyObject **)ptr = value;
return Py_NewRef(value);
}
/* c: a single byte-character */
static PyObject *
c_set(void *ptr, PyObject *value, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(char)));
if (PyBytes_Check(value)) {
if (PyBytes_GET_SIZE(value) != 1) {
PyErr_Format(PyExc_TypeError,
"one character bytes, bytearray, or an integer "
"in range(256) expected, not bytes of length %zd",
PyBytes_GET_SIZE(value));
return NULL;
}
*(char *)ptr = PyBytes_AS_STRING(value)[0];
_RET(value);
}
if (PyByteArray_Check(value)) {
if (PyByteArray_GET_SIZE(value) != 1) {
PyErr_Format(PyExc_TypeError,
"one character bytes, bytearray, or an integer "
"in range(256) expected, not bytearray of length %zd",
PyByteArray_GET_SIZE(value));
return NULL;
}
*(char *)ptr = PyByteArray_AS_STRING(value)[0];
_RET(value);
}
if (PyLong_Check(value)) {
int overflow;
long longval = PyLong_AsLongAndOverflow(value, &overflow);
if (longval == -1 && PyErr_Occurred()) {
return NULL;
}
if (overflow || longval < 0 || longval >= 256) {
PyErr_SetString(PyExc_TypeError, "integer not in range(256)");
return NULL;
}
*(char *)ptr = (char)longval;
_RET(value);
}
PyErr_Format(PyExc_TypeError,
"one character bytes, bytearray, or an integer "
"in range(256) expected, not %T",
value);
return NULL;
}
static PyObject *
c_get(void *ptr, Py_ssize_t size)
{
assert(NUM_BITS(size) || (size == sizeof(char)));
return PyBytes_FromStringAndSize((char *)ptr, 1);
}
/* u: a single wchar_t character */
static PyObject *