cpython/Include/cpython/object.h at main · python/cpython · GitHub

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#ifndef Py_CPYTHON_OBJECT_H

# error "this header file must not be included directly"

#endif

PyAPI_FUNC(void) _Py_NewReference(PyObject *op);

PyAPI_FUNC(void) _Py_NewReferenceNoTotal(PyObject *op);

PyAPI_FUNC(void) _Py_ResurrectReference(PyObject *op);

PyAPI_FUNC(void) _Py_ForgetReference(PyObject *op);

#ifdef Py_REF_DEBUG

/* These are useful as debugging aids when chasing down refleaks. */

PyAPI_FUNC(Py_ssize_t) _Py_GetGlobalRefTotal(void);

# define _Py_GetRefTotal() _Py_GetGlobalRefTotal()

PyAPI_FUNC(Py_ssize_t) _Py_GetLegacyRefTotal(void);

PyAPI_FUNC(Py_ssize_t) _PyInterpreterState_GetRefTotal(PyInterpreterState *);

#endif

/********************* String Literals ****************************************/

/* This structure helps managing static strings. The basic usage goes like this:

Instead of doing

r = PyObject_CallMethod(o, "foo", "args", ...);

_Py_IDENTIFIER(foo);

...

r = _PyObject_CallMethodId(o, &PyId_foo, "args", ...);

PyId_foo is a static variable, either on block level or file level. On first

usage, the string "foo" is interned, and the structures are linked. On interpreter

shutdown, all strings are released.

Alternatively, _Py_static_string allows choosing the variable name.

_PyUnicode_FromId returns a borrowed reference to the interned string.

_PyObject_{Get,Set,Has}AttrId are __getattr__ versions using _Py_Identifier*.

typedef struct _Py_Identifier {

const char* string;

// Index in PyInterpreterState.unicode.ids.array. It is process-wide

// unique and must be initialized to -1.

Py_ssize_t index;

// Hidden PyMutex struct for non free-threaded build.

struct {

uint8_t v;

} mutex;

} _Py_Identifier;

#ifndef Py_BUILD_CORE

// For now we are keeping _Py_IDENTIFIER for continued use

// in non-builtin extensions (and naughty PyPI modules).

#define _Py_static_string_init(value) { .string = (value), .index = -1 }

#define _Py_static_string(varname, value) static _Py_Identifier varname = _Py_static_string_init(value)

#define _Py_IDENTIFIER(varname) _Py_static_string(PyId_##varname, #varname)

#endif /* !Py_BUILD_CORE */

typedef struct {

/* Number implementations must check *both*

arguments for proper type and implement the necessary conversions

in the slot functions themselves. */

binaryfunc nb_add;

binaryfunc nb_subtract;

binaryfunc nb_multiply;

binaryfunc nb_remainder;

binaryfunc nb_divmod;

ternaryfunc nb_power;

unaryfunc nb_negative;

unaryfunc nb_positive;

unaryfunc nb_absolute;

inquiry nb_bool;

unaryfunc nb_invert;

binaryfunc nb_lshift;

binaryfunc nb_rshift;

binaryfunc nb_and;

binaryfunc nb_xor;

binaryfunc nb_or;

unaryfunc nb_int;

void *nb_reserved; /* the slot formerly known as nb_long */

unaryfunc nb_float;

binaryfunc nb_inplace_add;

binaryfunc nb_inplace_subtract;

binaryfunc nb_inplace_multiply;

binaryfunc nb_inplace_remainder;

ternaryfunc nb_inplace_power;

binaryfunc nb_inplace_lshift;

binaryfunc nb_inplace_rshift;

binaryfunc nb_inplace_and;

binaryfunc nb_inplace_xor;

binaryfunc nb_inplace_or;

binaryfunc nb_floor_divide;

binaryfunc nb_true_divide;

binaryfunc nb_inplace_floor_divide;

binaryfunc nb_inplace_true_divide;

unaryfunc nb_index;

binaryfunc nb_matrix_multiply;

binaryfunc nb_inplace_matrix_multiply;

} PyNumberMethods;

typedef struct {

lenfunc sq_length;

binaryfunc sq_concat;

ssizeargfunc sq_repeat;

ssizeargfunc sq_item;

void *was_sq_slice;

ssizeobjargproc sq_ass_item;

void *was_sq_ass_slice;

objobjproc sq_contains;

binaryfunc sq_inplace_concat;

ssizeargfunc sq_inplace_repeat;

} PySequenceMethods;

typedef struct {

lenfunc mp_length;

binaryfunc mp_subscript;

objobjargproc mp_ass_subscript;

} PyMappingMethods;

typedef PySendResult (*sendfunc)(PyObject *iter, PyObject *value, PyObject **result);

typedef struct {

unaryfunc am_await;

unaryfunc am_aiter;

unaryfunc am_anext;

sendfunc am_send;

} PyAsyncMethods;

typedef struct {

getbufferproc bf_getbuffer;

releasebufferproc bf_releasebuffer;

} PyBufferProcs;

/* Allow printfunc in the tp_vectorcall_offset slot for

* backwards-compatibility */

typedef Py_ssize_t printfunc;

// If this structure is modified, Doc/includes/typestruct.h should be updated

// as well.

struct _typeobject {

PyObject_VAR_HEAD

const char *tp_name; /* For printing, in format "<module>.<name>" */

Py_ssize_t tp_basicsize, tp_itemsize; /* For allocation */

/* Methods to implement standard operations */

destructor tp_dealloc;

Py_ssize_t tp_vectorcall_offset;

getattrfunc tp_getattr;

setattrfunc tp_setattr;

PyAsyncMethods *tp_as_async; /* formerly known as tp_compare (Python 2)

or tp_reserved (Python 3) */

reprfunc tp_repr;

/* Method suites for standard classes */

PyNumberMethods *tp_as_number;

PySequenceMethods *tp_as_sequence;

PyMappingMethods *tp_as_mapping;

/* More standard operations (here for binary compatibility) */

hashfunc tp_hash;

ternaryfunc tp_call;

reprfunc tp_str;

getattrofunc tp_getattro;

setattrofunc tp_setattro;

/* Functions to access object as input/output buffer */

PyBufferProcs *tp_as_buffer;

/* Flags to define presence of optional/expanded features */

unsigned long tp_flags;

const char *tp_doc; /* Documentation string */

/* Assigned meaning in release 2.0 */

/* call function for all accessible objects */

traverseproc tp_traverse;

/* delete references to contained objects */

inquiry tp_clear;

/* Assigned meaning in release 2.1 */

/* rich comparisons */

richcmpfunc tp_richcompare;

/* weak reference enabler */

Py_ssize_t tp_weaklistoffset;

/* Iterators */

getiterfunc tp_iter;

iternextfunc tp_iternext;

/* Attribute descriptor and subclassing stuff */

PyMethodDef *tp_methods;

PyMemberDef *tp_members;

PyGetSetDef *tp_getset;

// Strong reference on a heap type, borrowed reference on a static type

PyTypeObject *tp_base;

PyObject *tp_dict;

descrgetfunc tp_descr_get;

descrsetfunc tp_descr_set;

Py_ssize_t tp_dictoffset;

initproc tp_init;

allocfunc tp_alloc;

newfunc tp_new;

freefunc tp_free; /* Low-level free-memory routine */

inquiry tp_is_gc; /* For PyObject_IS_GC */

PyObject *tp_bases;

PyObject *tp_mro; /* method resolution order */

PyObject *tp_cache; /* no longer used */

void *tp_subclasses; /* for static builtin types this is an index */

PyObject *tp_weaklist; /* not used for static builtin types */

destructor tp_del;

/* Type attribute cache version tag. Added in version 2.6.

* If zero, the cache is invalid and must be initialized.

unsigned int tp_version_tag;

destructor tp_finalize;

vectorcallfunc tp_vectorcall;

/* Below here all fields are internal to the VM */

/* bitset of which type-watchers care about this type */

unsigned char tp_watched;

/* Number of tp_version_tag values used.

* Set to _Py_ATTR_CACHE_UNUSED if the attribute cache is

* disabled for this type (e.g. due to custom MRO entries).

* Otherwise, limited to MAX_VERSIONS_PER_CLASS (defined elsewhere).

uint16_t tp_versions_used;

/* Virtual iterator next function.

* This function must escape to any code that can result in

* the GC being run, such as Py_DECREF. */

_Py_iteritemfunc _tp_iteritem;

void *_tp_cache;

};

#define _Py_ATTR_CACHE_UNUSED (30000) // (see tp_versions_used)

/* This struct is used by the specializer

* It should be treated as an opaque blob

* by code other than the specializer and interpreter. */

struct _specialization_cache {

// In order to avoid bloating the bytecode with lots of inline caches, the

// members of this structure have a somewhat unique contract. They are set

// by the specialization machinery, and are invalidated by PyType_Modified.

// The rules for using them are as follows:

// - If getitem is non-NULL, then it is the same Python function that

// PyType_Lookup(cls, "__getitem__") would return.

// - If getitem is NULL, then getitem_version is meaningless.

// - If getitem->func_version == getitem_version, then getitem can be called

// with two positional arguments and no keyword arguments, and has neither

// *args nor **kwargs (as required by BINARY_OP_SUBSCR_GETITEM):

PyObject *getitem;

uint32_t getitem_version;

PyObject *init;

};

/* The *real* layout of a type object when allocated on the heap */

typedef struct _heaptypeobject {

/* Note: there's a dependency on the order of these members

in slotptr() in typeobject.c . */

PyTypeObject ht_type;

PyAsyncMethods as_async;

PyNumberMethods as_number;

PyMappingMethods as_mapping;

PySequenceMethods as_sequence; /* as_sequence comes after as_mapping,

so that the mapping wins when both

the mapping and the sequence define

a given operator (e.g. __getitem__).

see add_operators() in typeobject.c . */

PyBufferProcs as_buffer;

PyObject *ht_name, *ht_slots, *ht_qualname;

struct _dictkeysobject *ht_cached_keys;

PyObject *ht_module;

char *_ht_tpname; // Storage for "tp_name"; see PyType_FromModuleAndSpec

void *ht_token; // Storage for the "Py_tp_token" slot

struct _specialization_cache _spec_cache; // For use by the specializer.

#ifdef Py_GIL_DISABLED

Py_ssize_t unique_id; // ID used for per-thread refcounting

#endif

/* here are optional user slots, followed by the members. */

} PyHeapTypeObject;

PyAPI_FUNC(const char *) _PyType_Name(PyTypeObject *);

PyAPI_FUNC(PyObject *) _PyType_Lookup(PyTypeObject *, PyObject *);

PyAPI_FUNC(PyObject *) _PyType_LookupRef(PyTypeObject *, PyObject *);

PyAPI_FUNC(PyObject *) PyType_GetDict(PyTypeObject *);

PyAPI_FUNC(int) PyObject_Print(PyObject *, FILE *, int);

PyAPI_FUNC(void) _Py_BreakPoint(void);

PyAPI_FUNC(void) PyObject_Dump(PyObject *);

// Alias for backward compatibility

#define _PyObject_Dump PyObject_Dump

Py_DEPRECATED(3.15) PyAPI_FUNC(PyObject*) _PyObject_GetAttrId(PyObject *, _Py_Identifier *);

PyAPI_FUNC(PyObject **) _PyObject_GetDictPtr(PyObject *);

PyAPI_FUNC(void) PyObject_CallFinalizer(PyObject *);

PyAPI_FUNC(void) PyUnstable_Object_ClearWeakRefsNoCallbacks(PyObject *);

/* Same as PyObject_Generic{Get,Set}Attr, but passing the attributes

dict as the last parameter. */

PyAPI_FUNC(PyObject *)

_PyObject_GenericGetAttrWithDict(PyObject *, PyObject *, PyObject *, int);

PyAPI_FUNC(int)

_PyObject_GenericSetAttrWithDict(PyObject *, PyObject *,

PyObject *, PyObject *);

PyAPI_FUNC(PyObject *) _PyObject_FunctionStr(PyObject *);

/* Safely decref `dst` and set `dst` to `src`.

* As in case of Py_CLEAR "the obvious" code can be deadly:

* Py_DECREF(dst);

* dst = src;

* The safe way is:

* Py_SETREF(dst, src);

* That arranges to set `dst` to `src` _before_ decref'ing, so that any code

* triggered as a side-effect of `dst` getting torn down no longer believes

* `dst` points to a valid object.

* Temporary variables are used to only evaluate macro arguments once and so

* avoid the duplication of side effects. _Py_TYPEOF() or memcpy() is used to

* avoid a miscompilation caused by type punning. See Py_CLEAR() comment for

* implementation details about type punning.

* The memcpy() implementation does not emit a compiler warning if 'src' has

* not the same type than 'src': any pointer type is accepted for 'src'.

#ifdef _Py_TYPEOF

#define Py_SETREF(dst, src) \

do { \

_Py_TYPEOF(dst)* _tmp_dst_ptr = &(dst); \

_Py_TYPEOF(dst) _tmp_old_dst = (*_tmp_dst_ptr); \

*_tmp_dst_ptr = (src); \

Py_DECREF(_tmp_old_dst); \

} while (0)

#else

#define Py_SETREF(dst, src) \

do { \

PyObject **_tmp_dst_ptr = _Py_CAST(PyObject**, &(dst)); \

PyObject *_tmp_old_dst = (*_tmp_dst_ptr); \

PyObject *_tmp_src = _PyObject_CAST(src); \

memcpy(_tmp_dst_ptr, &_tmp_src, sizeof(PyObject*)); \

Py_DECREF(_tmp_old_dst); \

} while (0)

#endif

/* Py_XSETREF() is a variant of Py_SETREF() that uses Py_XDECREF() instead of

* Py_DECREF().

#ifdef _Py_TYPEOF

#define Py_XSETREF(dst, src) \

do { \

_Py_TYPEOF(dst)* _tmp_dst_ptr = &(dst); \

_Py_TYPEOF(dst) _tmp_old_dst = (*_tmp_dst_ptr); \

*_tmp_dst_ptr = (src); \

Py_XDECREF(_tmp_old_dst); \

} while (0)

#else

#define Py_XSETREF(dst, src) \

do { \

PyObject **_tmp_dst_ptr = _Py_CAST(PyObject**, &(dst)); \

PyObject *_tmp_old_dst = (*_tmp_dst_ptr); \

PyObject *_tmp_src = _PyObject_CAST(src); \

memcpy(_tmp_dst_ptr, &_tmp_src, sizeof(PyObject*)); \

Py_XDECREF(_tmp_old_dst); \

} while (0)

#endif

/* Define a pair of assertion macros:

_PyObject_ASSERT_FROM(), _PyObject_ASSERT_WITH_MSG() and _PyObject_ASSERT().

These work like the regular C assert(), in that they will abort the

process with a message on stderr if the given condition fails to hold,

but compile away to nothing if NDEBUG is defined.

However, before aborting, Python will also try to call

PyObject_Dump() on the given object. This may be of use when

investigating bugs in which a particular object is corrupt (e.g. buggy a

tp_visit method in an extension module breaking the garbage collector), to

help locate the broken objects.

The WITH_MSG variant allows you to supply an additional message that Python

will attempt to print to stderr, after the object dump. */

#ifdef NDEBUG

/* No debugging: compile away the assertions: */

# define _PyObject_ASSERT_FROM(obj, expr, msg, filename, lineno, func) \

((void)0)

#else

/* With debugging: generate checks: */

# define _PyObject_ASSERT_FROM(obj, expr, msg, filename, lineno, func) \

((expr) \

? (void)(0) \

: _PyObject_AssertFailed((obj), Py_STRINGIFY(expr), \

(msg), (filename), (lineno), (func)))

#endif

#define _PyObject_ASSERT_WITH_MSG(obj, expr, msg) \

_PyObject_ASSERT_FROM((obj), expr, (msg), __FILE__, __LINE__, __func__)

#define _PyObject_ASSERT(obj, expr) \

_PyObject_ASSERT_WITH_MSG((obj), expr, NULL)

#define _PyObject_ASSERT_FAILED_MSG(obj, msg) \

_PyObject_AssertFailed((obj), NULL, (msg), __FILE__, __LINE__, __func__)

/* Declare and define _PyObject_AssertFailed() even when NDEBUG is defined,

to avoid causing compiler/linker errors when building extensions without

NDEBUG against a Python built with NDEBUG defined.

msg, expr and function can be NULL. */

PyAPI_FUNC(void) _Py_NO_RETURN _PyObject_AssertFailed(

PyObject *obj,

const char *expr,

const char *msg,

const char *file,

int line,

const char *function);

PyAPI_FUNC(void) _PyTrash_thread_deposit_object(PyThreadState *tstate, PyObject *op);

PyAPI_FUNC(void) _PyTrash_thread_destroy_chain(PyThreadState *tstate);

/* For backwards compatibility with the old trashcan mechanism */

#define Py_TRASHCAN_BEGIN(op, dealloc)

#define Py_TRASHCAN_END

PyAPI_FUNC(void *) PyObject_GetItemData(PyObject *obj);

PyAPI_FUNC(void *) PyObject_GetItemData_DuringGC(PyObject *obj);

PyAPI_FUNC(int) PyObject_VisitManagedDict(PyObject *obj, visitproc visit, void *arg);

PyAPI_FUNC(void) PyObject_ClearManagedDict(PyObject *obj);

typedef int(*PyType_WatchCallback)(PyTypeObject *);

PyAPI_FUNC(int) PyType_AddWatcher(PyType_WatchCallback callback);

PyAPI_FUNC(int) PyType_ClearWatcher(int watcher_id);

PyAPI_FUNC(int) PyType_Watch(int watcher_id, PyObject *type);

PyAPI_FUNC(int) PyType_Unwatch(int watcher_id, PyObject *type);

/* Attempt to assign a version tag to the given type.

* Returns 1 if the type already had a valid version tag or a new one was

* assigned, or 0 if a new tag could not be assigned.

PyAPI_FUNC(int) PyUnstable_Type_AssignVersionTag(PyTypeObject *type);

typedef enum {

PyRefTracer_CREATE = 0,

PyRefTracer_DESTROY = 1,

PyRefTracer_TRACKER_REMOVED = 2,

} PyRefTracerEvent;

typedef int (*PyRefTracer)(PyObject *, PyRefTracerEvent event, void *);

PyAPI_FUNC(int) PyRefTracer_SetTracer(PyRefTracer tracer, void *data);

PyAPI_FUNC(PyRefTracer) PyRefTracer_GetTracer(void**);

/* Enable PEP-703 deferred reference counting on the object.

* Returns 1 if deferred reference counting was successfully enabled, and

* 0 if the runtime ignored it. This function cannot fail.

PyAPI_FUNC(int) PyUnstable_Object_EnableDeferredRefcount(PyObject *);

/* Determine if the object exists as a unique temporary variable on the

* topmost frame of the interpreter.

PyAPI_FUNC(int) PyUnstable_Object_IsUniqueReferencedTemporary(PyObject *);

/* Check whether the object is immortal. This cannot fail. */

PyAPI_FUNC(int) PyUnstable_IsImmortal(PyObject *);

// Increments the reference count of the object, if it's not zero.

// PyUnstable_EnableTryIncRef() should be called on the object

// before calling this function in order to avoid spurious failures.

PyAPI_FUNC(int) PyUnstable_TryIncRef(PyObject *);

PyAPI_FUNC(void) PyUnstable_EnableTryIncRef(PyObject *);

PyAPI_FUNC(int) PyUnstable_Object_IsUniquelyReferenced(PyObject *);

PyAPI_FUNC(int) PyUnstable_SetImmortal(PyObject *op);

#if defined(Py_GIL_DISABLED)

PyAPI_FUNC(uintptr_t) _Py_GetThreadLocal_Addr(void);

static inline uintptr_t

_Py_ThreadId(void)

{

uintptr_t tid;

#if defined(_MSC_VER) && defined(_M_X64)

tid = __readgsqword(48);

#elif defined(_MSC_VER) && defined(_M_IX86)

tid = __readfsdword(24);

#elif defined(_MSC_VER) && defined(_M_ARM64)

tid = __getReg(18);

#elif defined(__MINGW32__) && defined(_M_X64)

tid = __readgsqword(48);

#elif defined(__MINGW32__) && defined(_M_IX86)

tid = __readfsdword(24);

#elif defined(__MINGW32__) && defined(_M_ARM64)

tid = __getReg(18);

#elif defined(__i386__)

__asm__("{movl %%gs:0, %0|mov %0, dword ptr gs:[0]}" : "=r" (tid)); // 32-bit always uses GS

#elif defined(__MACH__) && defined(__x86_64__)

__asm__("{movq %%gs:0, %0|mov %0, qword ptr gs:[0]}" : "=r" (tid)); // x86_64 macOSX uses GS

#elif defined(__x86_64__)

__asm__("{movq %%fs:0, %0|mov %0, qword ptr fs:[0]}" : "=r" (tid)); // x86_64 Linux, BSD uses FS

#elif defined(__arm__) && __ARM_ARCH >= 7

__asm__ ("mrc p15, 0, %0, c13, c0, 3\nbic %0, %0, #3" : "=r" (tid));

#elif defined(__aarch64__) && defined(__APPLE__)

__asm__ ("mrs %0, tpidrro_el0" : "=r" (tid));

#elif defined(__aarch64__)

__asm__ ("mrs %0, tpidr_el0" : "=r" (tid));

#elif defined(__powerpc64__)

#if defined(__clang__) && _Py__has_builtin(__builtin_thread_pointer)

tid = (uintptr_t)__builtin_thread_pointer();

#else

// r13 is reserved for use as system thread ID by the Power 64-bit ABI.

__asm__("" : "=r" (tp));

tid = tp;

#endif

#elif defined(__powerpc__)

#if defined(__clang__) && _Py__has_builtin(__builtin_thread_pointer)

tid = (uintptr_t)__builtin_thread_pointer();

#else

// r2 is reserved for use as system thread ID by the Power 32-bit ABI.

__asm__ ("" : "=r" (tp));

tid = tp;

#endif

#elif defined(__s390__) && defined(__GNUC__)

// Both GCC and Clang have supported __builtin_thread_pointer

// for s390 from long time ago.

tid = (uintptr_t)__builtin_thread_pointer();

#elif defined(__riscv)

#if defined(__clang__) && _Py__has_builtin(__builtin_thread_pointer)

tid = (uintptr_t)__builtin_thread_pointer();

#else

// tp is Thread Pointer provided by the RISC-V ABI.

__asm__ ("mv %0, tp" : "=r" (tid));

#endif

#else

// Fallback to a portable implementation if we do not have a faster

// platform-specific implementation.

tid = _Py_GetThreadLocal_Addr();

#endif

return tid;

}

static inline Py_ALWAYS_INLINE int

_Py_IsOwnedByCurrentThread(PyObject *ob)

{

#ifdef _Py_THREAD_SANITIZER

return _Py_atomic_load_uintptr_relaxed(&ob->ob_tid) == _Py_ThreadId();

#else

return ob->ob_tid == _Py_ThreadId();

#endif

}

#endif

cpython/Include/cpython/object.h at main · python/cpython · GitHub

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cpython/Include/cpython/object.h at main · python/cpython · GitHub

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