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#ifndef Py_INTERNAL_STACKREF_H
#define Py_INTERNAL_STACKREF_H
#ifdef __cplusplus
extern "C" {
#endif
#ifndef Py_BUILD_CORE
# error "this header requires Py_BUILD_CORE define"
#endif
#include <stddef.h>
typedef union {
uintptr_t bits;
} _PyStackRef;
static const _PyStackRef Py_STACKREF_NULL = { .bits = 0 };
#define Py_TAG_DEFERRED (1)
// Gets a PyObject * from a _PyStackRef
#if defined(Py_GIL_DISABLED)
static inline PyObject *
PyStackRef_Get(_PyStackRef tagged)
{
PyObject *cleared = ((PyObject *)((tagged).bits & (~Py_TAG_DEFERRED)));
return cleared;
}
#else
# define PyStackRef_Get(tagged) ((PyObject *)((tagged).bits))
#endif
// Converts a PyObject * to a PyStackRef, stealing the reference.
#if defined(Py_GIL_DISABLED)
static inline _PyStackRef
_PyStackRef_StealRef(PyObject *obj)
{
// Make sure we don't take an already tagged value.
assert(((uintptr_t)obj & Py_TAG_DEFERRED) == 0);
return ((_PyStackRef){.bits = ((uintptr_t)(obj))});
}
# define PyStackRef_StealRef(obj) _PyStackRef_StealRef(_PyObject_CAST(obj))
#else
# define PyStackRef_StealRef(obj) ((_PyStackRef){.bits = ((uintptr_t)(obj))})
#endif
// Converts a PyObject * to a PyStackRef, with a new reference
#if defined(Py_GIL_DISABLED)
static inline _PyStackRef
_PyStackRef_NewRefDeferred(PyObject *obj)
{
// Make sure we don't take an already tagged value.
assert(((uintptr_t)obj & Py_TAG_DEFERRED) == 0);
assert(obj != NULL);
if (_PyObject_HasDeferredRefcount(obj)) {
return (_PyStackRef){ .bits = (uintptr_t)obj | Py_TAG_DEFERRED };
}
else {
return (_PyStackRef){ .bits = (uintptr_t)Py_NewRef(obj) };
}
}
# define PyStackRef_NewRefDeferred(obj) _PyStackRef_NewRefDeferred(_PyObject_CAST(obj))
#else
# define PyStackRef_NewRefDeferred(obj) PyStackRef_NewRef(((_PyStackRef){.bits = ((uintptr_t)(obj))}))
#endif
#if defined(Py_GIL_DISABLED)
static inline _PyStackRef
_PyStackRef_XNewRefDeferred(PyObject *obj)
{
// Make sure we don't take an already tagged value.
assert(((uintptr_t)obj & Py_TAG_DEFERRED) == 0);
if (obj == NULL) {
return Py_STACKREF_NULL;
}
return _PyStackRef_NewRefDeferred(obj);
}
# define PyStackRef_XNewRefDeferred(obj) _PyStackRef_XNewRefDeferred(_PyObject_CAST(obj))
#else
# define PyStackRef_XNewRefDeferred(obj) PyStackRef_XNewRef(((_PyStackRef){.bits = ((uintptr_t)(obj))}))
#endif
// Converts a PyStackRef back to a PyObject *.
#if defined(Py_GIL_DISABLED)
static inline PyObject *
PyStackRef_StealObject(_PyStackRef tagged)
{
if ((tagged.bits & Py_TAG_DEFERRED) == Py_TAG_DEFERRED) {
assert(_PyObject_HasDeferredRefcount(PyStackRef_Get(tagged)));
return Py_NewRef(PyStackRef_Get(tagged));
}
return PyStackRef_Get(tagged);
}
#else
# define PyStackRef_StealObject(tagged) PyStackRef_Get(tagged)
#endif
static inline void
_Py_untag_stack_borrowed(PyObject **dst, const _PyStackRef *src, size_t length)
{
for (size_t i = 0; i < length; i++) {
dst[i] = PyStackRef_Get(src[i]);
}
}
static inline void
_Py_untag_stack_steal(PyObject **dst, const _PyStackRef *src, size_t length)
{
for (size_t i = 0; i < length; i++) {
dst[i] = PyStackRef_StealObject(src[i]);
}
}
#define PyStackRef_XSETREF(dst, src) \
do { \
_PyStackRef *_tmp_dst_ptr = &(dst); \
_PyStackRef _tmp_old_dst = (*_tmp_dst_ptr); \
*_tmp_dst_ptr = (src); \
PyStackRef_XDECREF(_tmp_old_dst); \
} while (0)
#define PyStackRef_SETREF(dst, src) \
do { \
_PyStackRef *_tmp_dst_ptr = &(dst); \
_PyStackRef _tmp_old_dst = (*_tmp_dst_ptr); \
*_tmp_dst_ptr = (src); \
PyStackRef_DECREF(_tmp_old_dst); \
} while (0)
#define PyStackRef_CLEAR(op) \
do { \
_PyStackRef *_tmp_op_ptr = &(op); \
_PyStackRef _tmp_old_op = (*_tmp_op_ptr); \
if (_tmp_old_op.bits != Py_STACKREF_NULL.bits) { \
*_tmp_op_ptr = Py_STACKREF_NULL; \
PyStackRef_DECREF(_tmp_old_op); \
} \
} while (0)
#if defined(Py_GIL_DISABLED)
static inline void
PyStackRef_DECREF(_PyStackRef tagged)
{
if ((tagged.bits & Py_TAG_DEFERRED) == Py_TAG_DEFERRED) {
return;
}
Py_DECREF(PyStackRef_Get(tagged));
}
#else
# define PyStackRef_DECREF(op) Py_DECREF(PyStackRef_Get(op))
#endif
#if defined(Py_GIL_DISABLED)
static inline void
PyStackRef_INCREF(_PyStackRef tagged)
{
if ((tagged.bits & Py_TAG_DEFERRED) == Py_TAG_DEFERRED) {
assert(_PyObject_HasDeferredRefcount(PyStackRef_Get(tagged)));
return;
}
Py_INCREF(PyStackRef_Get(tagged));
}
#else
# define PyStackRef_INCREF(op) Py_INCREF(PyStackRef_Get(op))
#endif
static inline void
PyStackRef_XDECREF(_PyStackRef op)
{
if (op.bits != Py_STACKREF_NULL.bits) {
PyStackRef_DECREF(op);
}
}
static inline _PyStackRef
PyStackRef_NewRef(_PyStackRef obj)
{
PyStackRef_INCREF(obj);
return obj;
}
static inline _PyStackRef
PyStackRef_XNewRef(_PyStackRef obj)
{
if (obj.bits == Py_STACKREF_NULL.bits) {
return obj;
}
return PyStackRef_NewRef(obj);
}
#ifdef __cplusplus
}
#endif
#endif /* !Py_INTERNAL_STACKREF_H */
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