diff options
Diffstat (limited to 'Include/object.h')
| -rw-r--r-- | Include/object.h | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/Include/object.h b/Include/object.h index 8cc83abb857..c75e9db0cbd 100644 --- a/Include/object.h +++ b/Include/object.h @@ -101,6 +101,12 @@ whose size is determined when the object is allocated. #define PyObject_VAR_HEAD PyVarObject ob_base; #define Py_INVALID_SIZE (Py_ssize_t)-1 +/* PyObjects are given a minimum alignment so that the least significant bits + * of an object pointer become available for other purposes. + * This must be an integer literal with the value (1 << _PyGC_PREV_SHIFT), number of bytes. + */ +#define _PyObject_MIN_ALIGNMENT 4 + /* Nothing is actually declared to be a PyObject, but every pointer to * a Python object can be cast to a PyObject*. This is inheritance built * by hand. Similarly every pointer to a variable-size Python object can, @@ -136,6 +142,7 @@ struct _object { #else Py_ssize_t ob_refcnt; #endif + _Py_ALIGNED_DEF(_PyObject_MIN_ALIGNMENT, char) _aligner; }; #ifdef _MSC_VER __pragma(warning(pop)) @@ -153,7 +160,7 @@ struct _object { // ob_tid stores the thread id (or zero). It is also used by the GC and the // trashcan mechanism as a linked list pointer and by the GC to store the // computed "gc_refs" refcount. - uintptr_t ob_tid; + _Py_ALIGNED_DEF(_PyObject_MIN_ALIGNMENT, uintptr_t) ob_tid; uint16_t ob_flags; PyMutex ob_mutex; // per-object lock uint8_t ob_gc_bits; // gc-related state @@ -620,6 +627,12 @@ given type object has a specified feature. #define Py_TPFLAGS_HAVE_FINALIZE (1UL << 0) #define Py_TPFLAGS_HAVE_VERSION_TAG (1UL << 18) +// Flag values for ob_flags (16 bits available, if SIZEOF_VOID_P > 4). +#define _Py_IMMORTAL_FLAGS (1 << 0) +#define _Py_STATICALLY_ALLOCATED_FLAG (1 << 2) +#if defined(Py_GIL_DISABLED) && defined(Py_DEBUG) +#define _Py_TYPE_REVEALED_FLAG (1 << 3) +#endif #define Py_CONSTANT_NONE 0 #define Py_CONSTANT_FALSE 1 @@ -654,8 +667,13 @@ PyAPI_DATA(PyObject) _Py_NoneStruct; /* Don't use this directly */ PyAPI_FUNC(int) Py_IsNone(PyObject *x); #define Py_IsNone(x) Py_Is((x), Py_None) -/* Macro for returning Py_None from a function */ -#define Py_RETURN_NONE return Py_None +/* Macro for returning Py_None from a function. + * Only treat Py_None as immortal in the limited C API 3.12 and newer. */ +#if defined(Py_LIMITED_API) && Py_LIMITED_API+0 < 0x030c0000 +# define Py_RETURN_NONE return Py_NewRef(Py_None) +#else +# define Py_RETURN_NONE return Py_None +#endif /* Py_NotImplemented is a singleton used to signal that an operation is @@ -776,11 +794,7 @@ PyType_HasFeature(PyTypeObject *type, unsigned long feature) // PyTypeObject is opaque in the limited C API flags = PyType_GetFlags(type); #else -# ifdef Py_GIL_DISABLED - flags = _Py_atomic_load_ulong_relaxed(&type->tp_flags); -# else - flags = type->tp_flags; -# endif + flags = type->tp_flags; #endif return ((flags & feature) != 0); } |