2002-04-28 01:11:46 -03:00
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/* The PyObject_ memory family: high-level object memory interfaces.
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See pymem.h for the low-level PyMem_ family.
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*/
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1991-02-19 08:39:46 -04:00
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2000-07-08 21:55:06 -03:00
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#ifndef Py_OBJIMPL_H
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#define Py_OBJIMPL_H
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2000-07-31 19:19:30 -03:00
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#include "pymem.h"
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2000-07-08 21:55:06 -03:00
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#ifdef __cplusplus
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extern "C" {
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#endif
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2002-04-28 01:11:46 -03:00
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/* BEWARE:
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Each interface exports both functions and macros. Extension modules should
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use the functions, to ensure binary compatibility across Python versions.
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Because the Python implementation is free to change internal details, and
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the macros may (or may not) expose details for speed, if you do use the
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macros you must recompile your extensions with each Python release.
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Never mix calls to PyObject_ memory functions with calls to the platform
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malloc/realloc/ calloc/free, or with calls to PyMem_.
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*/
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1990-10-14 09:07:46 -03:00
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/*
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2000-05-03 20:44:39 -03:00
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Functions and macros for modules that implement new object types.
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2002-04-28 01:11:46 -03:00
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- PyObject_New(type, typeobj) allocates memory for a new object of the given
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type, and initializes part of it. 'type' must be the C structure type used
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to represent the object, and 'typeobj' the address of the corresponding
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type object. Reference count and type pointer are filled in; the rest of
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the bytes of the object are *undefined*! The resulting expression type is
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'type *'. The size of the object is determined by the tp_basicsize field
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of the type object.
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- PyObject_NewVar(type, typeobj, n) is similar but allocates a variable-size
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object with room for n items. In addition to the refcount and type pointer
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fields, this also fills in the ob_size field.
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- PyObject_Del(op) releases the memory allocated for an object. It does not
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run a destructor -- it only frees the memory. PyObject_Free is identical.
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- PyObject_Init(op, typeobj) and PyObject_InitVar(op, typeobj, n) don't
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allocate memory. Instead of a 'type' parameter, they take a pointer to a
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new object (allocated by an arbitrary allocator), and initialize its object
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header fields.
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Note that objects created with PyObject_{New, NewVar} are allocated using the
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specialized Python allocator (implemented in obmalloc.c), if WITH_PYMALLOC is
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enabled. In addition, a special debugging allocator is used if PYMALLOC_DEBUG
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is also #defined.
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In case a specific form of memory management is needed (for example, if you
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must use the platform malloc heap(s), or shared memory, or C++ local storage or
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operator new), you must first allocate the object with your custom allocator,
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then pass its pointer to PyObject_{Init, InitVar} for filling in its Python-
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specific fields: reference count, type pointer, possibly others. You should
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2018-02-06 19:07:30 -04:00
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be aware that Python has no control over these objects because they don't
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2002-04-28 01:11:46 -03:00
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cooperate with the Python memory manager. Such objects may not be eligible
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for automatic garbage collection and you have to make sure that they are
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released accordingly whenever their destructor gets called (cf. the specific
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2000-05-03 20:44:39 -03:00
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form of memory management you're using).
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2002-04-28 01:11:46 -03:00
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Unless you have specific memory management requirements, use
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PyObject_{New, NewVar, Del}.
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*/
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2000-05-03 20:44:39 -03:00
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/*
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* Raw object memory interface
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* ===========================
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*/
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2002-04-12 02:21:34 -03:00
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/* Functions to call the same malloc/realloc/free as used by Python's
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object allocator. If WITH_PYMALLOC is enabled, these may differ from
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the platform malloc/realloc/free. The Python object allocator is
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designed for fast, cache-conscious allocation of many "small" objects,
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2002-04-28 01:11:46 -03:00
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and with low hidden memory overhead.
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PyObject_Malloc(0) returns a unique non-NULL pointer if possible.
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PyObject_Realloc(NULL, n) acts like PyObject_Malloc(n).
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PyObject_Realloc(p != NULL, 0) does not return NULL, or free the memory
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at p.
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Returned pointers must be checked for NULL explicitly; no action is
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performed on failure other than to return NULL (no warning it printed, no
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exception is set, etc).
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For allocating objects, use PyObject_{New, NewVar} instead whenever
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possible. The PyObject_{Malloc, Realloc, Free} family is exposed
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so that you can exploit Python's small-block allocator for non-object
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uses. If you must use these routines to allocate object memory, make sure
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the object gets initialized via PyObject_{Init, InitVar} after obtaining
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the raw memory.
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*/
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2013-07-06 21:05:46 -03:00
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PyAPI_FUNC(void *) PyObject_Malloc(size_t size);
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2016-12-27 08:57:39 -04:00
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#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03050000
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2014-05-02 17:31:14 -03:00
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PyAPI_FUNC(void *) PyObject_Calloc(size_t nelem, size_t elsize);
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2016-12-27 08:57:39 -04:00
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#endif
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2013-07-06 21:05:46 -03:00
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PyAPI_FUNC(void *) PyObject_Realloc(void *ptr, size_t new_size);
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PyAPI_FUNC(void) PyObject_Free(void *ptr);
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2000-05-03 20:44:39 -03:00
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2016-09-11 05:03:14 -03:00
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#ifndef Py_LIMITED_API
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2012-12-09 09:28:26 -04:00
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/* This function returns the number of allocated memory blocks, regardless of size */
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PyAPI_FUNC(Py_ssize_t) _Py_GetAllocatedBlocks(void);
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2016-09-11 05:03:14 -03:00
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#endif /* !Py_LIMITED_API */
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2002-04-11 23:38:45 -03:00
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2000-05-03 20:44:39 -03:00
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/* Macros */
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2002-04-11 23:38:45 -03:00
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#ifdef WITH_PYMALLOC
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2012-06-22 15:55:41 -03:00
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#ifndef Py_LIMITED_API
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2017-12-06 12:26:10 -04:00
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PyAPI_FUNC(int) _PyObject_DebugMallocStats(FILE *out);
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2012-06-22 15:55:41 -03:00
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#endif /* #ifndef Py_LIMITED_API */
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2013-07-06 21:05:46 -03:00
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#endif
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/* Macros */
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2010-05-09 12:52:27 -03:00
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#define PyObject_MALLOC PyObject_Malloc
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#define PyObject_REALLOC PyObject_Realloc
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#define PyObject_FREE PyObject_Free
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#define PyObject_Del PyObject_Free
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2013-07-06 21:05:46 -03:00
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#define PyObject_DEL PyObject_Free
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2002-04-11 23:38:45 -03:00
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2000-05-03 20:44:39 -03:00
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/*
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* Generic object allocator interface
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* ==================================
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*/
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/* Functions */
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2002-08-12 04:21:58 -03:00
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PyAPI_FUNC(PyObject *) PyObject_Init(PyObject *, PyTypeObject *);
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PyAPI_FUNC(PyVarObject *) PyObject_InitVar(PyVarObject *,
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2006-02-15 13:27:45 -04:00
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PyTypeObject *, Py_ssize_t);
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2002-08-12 04:21:58 -03:00
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PyAPI_FUNC(PyObject *) _PyObject_New(PyTypeObject *);
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2006-02-15 13:27:45 -04:00
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PyAPI_FUNC(PyVarObject *) _PyObject_NewVar(PyTypeObject *, Py_ssize_t);
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2000-05-03 20:44:39 -03:00
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#define PyObject_New(type, typeobj) \
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2010-05-09 12:52:27 -03:00
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( (type *) _PyObject_New(typeobj) )
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2000-05-03 20:44:39 -03:00
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#define PyObject_NewVar(type, typeobj, n) \
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2010-05-09 12:52:27 -03:00
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( (type *) _PyObject_NewVar((typeobj), (n)) )
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2000-05-03 20:44:39 -03:00
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2000-08-16 09:27:23 -03:00
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/* Macros trading binary compatibility for speed. See also pymem.h.
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2000-05-03 20:44:39 -03:00
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Note that these macros expect non-NULL object pointers.*/
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#define PyObject_INIT(op, typeobj) \
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2010-05-09 12:52:27 -03:00
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( Py_TYPE(op) = (typeobj), _Py_NewReference((PyObject *)(op)), (op) )
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2000-05-03 20:44:39 -03:00
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#define PyObject_INIT_VAR(op, typeobj, size) \
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2010-05-09 12:52:27 -03:00
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( Py_SIZE(op) = (size), PyObject_INIT((op), (typeobj)) )
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2000-05-03 20:44:39 -03:00
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#define _PyObject_SIZE(typeobj) ( (typeobj)->tp_basicsize )
|
2001-10-06 18:27:34 -03:00
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2001-10-07 00:54:51 -03:00
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/* _PyObject_VAR_SIZE returns the number of bytes (as size_t) allocated for a
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vrbl-size object with nitems items, exclusive of gc overhead (if any). The
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value is rounded up to the closest multiple of sizeof(void *), in order to
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|
ensure that pointer fields at the end of the object are correctly aligned
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for the platform (this is of special importance for subclasses of, e.g.,
|
2013-08-27 13:40:23 -03:00
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str or int, so that pointers can be stored after the embedded data).
|
2001-10-07 00:54:51 -03:00
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Note that there's no memory wastage in doing this, as malloc has to
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return (at worst) pointer-aligned memory anyway.
|
2001-10-06 18:27:34 -03:00
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*/
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2001-10-07 00:54:51 -03:00
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#if ((SIZEOF_VOID_P - 1) & SIZEOF_VOID_P) != 0
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# error "_PyObject_VAR_SIZE requires SIZEOF_VOID_P be a power of 2"
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#endif
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2010-05-09 12:52:27 -03:00
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#define _PyObject_VAR_SIZE(typeobj, nitems) \
|
2012-09-20 15:56:47 -03:00
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_Py_SIZE_ROUND_UP((typeobj)->tp_basicsize + \
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(nitems)*(typeobj)->tp_itemsize, \
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SIZEOF_VOID_P)
|
2000-05-03 20:44:39 -03:00
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#define PyObject_NEW(type, typeobj) \
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( (type *) PyObject_Init( \
|
2010-05-09 12:52:27 -03:00
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(PyObject *) PyObject_MALLOC( _PyObject_SIZE(typeobj) ), (typeobj)) )
|
2001-10-06 18:27:34 -03:00
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2001-10-07 00:54:51 -03:00
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#define PyObject_NEW_VAR(type, typeobj, n) \
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( (type *) PyObject_InitVar( \
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(PyVarObject *) PyObject_MALLOC(_PyObject_VAR_SIZE((typeobj),(n)) ),\
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(typeobj), (n)) )
|
2000-05-03 20:44:39 -03:00
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/* This example code implements an object constructor with a custom
|
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allocator, where PyObject_New is inlined, and shows the important
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distinction between two steps (at least):
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1) the actual allocation of the object storage;
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2) the initialization of the Python specific fields
|
2010-05-09 12:52:27 -03:00
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in this storage with PyObject_{Init, InitVar}.
|
2000-05-03 20:44:39 -03:00
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PyObject *
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YourObject_New(...)
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{
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PyObject *op;
|
1990-10-14 09:07:46 -03:00
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2000-05-03 20:44:39 -03:00
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op = (PyObject *) Your_Allocator(_PyObject_SIZE(YourTypeStruct));
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if (op == NULL)
|
2010-05-09 12:52:27 -03:00
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return PyErr_NoMemory();
|
1993-07-28 06:05:47 -03:00
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2002-04-28 01:11:46 -03:00
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PyObject_Init(op, &YourTypeStruct);
|
1996-07-20 23:23:54 -03:00
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2000-05-03 20:44:39 -03:00
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op->ob_field = value;
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...
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return op;
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}
|
1996-07-20 23:23:54 -03:00
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2000-05-03 20:44:39 -03:00
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Note that in C++, the use of the new operator usually implies that
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the 1st step is performed automatically for you, so in a C++ class
|
2002-04-28 01:11:46 -03:00
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constructor you would start directly with PyObject_Init/InitVar
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*/
|
1996-07-20 23:23:54 -03:00
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2013-07-06 21:05:46 -03:00
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#ifndef Py_LIMITED_API
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typedef struct {
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/* user context passed as the first argument to the 2 functions */
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void *ctx;
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/* allocate an arena of size bytes */
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void* (*alloc) (void *ctx, size_t size);
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/* free an arena */
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void (*free) (void *ctx, void *ptr, size_t size);
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} PyObjectArenaAllocator;
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/* Get the arena allocator. */
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PyAPI_FUNC(void) PyObject_GetArenaAllocator(PyObjectArenaAllocator *allocator);
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/* Set the arena allocator. */
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PyAPI_FUNC(void) PyObject_SetArenaAllocator(PyObjectArenaAllocator *allocator);
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#endif
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2000-06-30 02:02:53 -03:00
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|
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/*
|
|
|
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* Garbage Collection Support
|
|
|
|
* ==========================
|
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|
*/
|
2000-06-23 16:37:02 -03:00
|
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|
2016-09-10 01:47:46 -03:00
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|
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/* C equivalent of gc.collect() which ignores the state of gc.enabled. */
|
2006-03-04 16:01:53 -04:00
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PyAPI_FUNC(Py_ssize_t) PyGC_Collect(void);
|
2003-04-17 14:29:22 -03:00
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|
2013-05-18 20:11:58 -03:00
|
|
|
#ifndef Py_LIMITED_API
|
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|
PyAPI_FUNC(Py_ssize_t) _PyGC_CollectNoFail(void);
|
2016-09-10 01:47:46 -03:00
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PyAPI_FUNC(Py_ssize_t) _PyGC_CollectIfEnabled(void);
|
2013-05-18 20:11:58 -03:00
|
|
|
#endif
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|
2001-08-29 20:49:28 -03:00
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|
|
/* Test if a type has a GC head */
|
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|
#define PyType_IS_GC(t) PyType_HasFeature((t), Py_TPFLAGS_HAVE_GC)
|
2000-06-30 02:02:53 -03:00
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2001-08-29 20:49:28 -03:00
|
|
|
/* Test if an object has a GC head */
|
2007-12-18 22:45:37 -04:00
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#define PyObject_IS_GC(o) (PyType_IS_GC(Py_TYPE(o)) && \
|
2010-05-09 12:52:27 -03:00
|
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(Py_TYPE(o)->tp_is_gc == NULL || Py_TYPE(o)->tp_is_gc(o)))
|
2001-08-02 01:15:00 -03:00
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|
2006-02-16 10:56:14 -04:00
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|
|
PyAPI_FUNC(PyVarObject *) _PyObject_GC_Resize(PyVarObject *, Py_ssize_t);
|
2001-08-29 20:49:28 -03:00
|
|
|
#define PyObject_GC_Resize(type, op, n) \
|
2010-05-09 12:52:27 -03:00
|
|
|
( (type *) _PyObject_GC_Resize((PyVarObject *)(op), (n)) )
|
2000-06-30 02:02:53 -03:00
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|
2002-04-28 01:11:46 -03:00
|
|
|
/* GC information is stored BEFORE the object structure. */
|
2010-12-03 16:14:31 -04:00
|
|
|
#ifndef Py_LIMITED_API
|
2001-10-11 15:31:31 -03:00
|
|
|
typedef union _gc_head {
|
2010-05-09 12:52:27 -03:00
|
|
|
struct {
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|
|
union _gc_head *gc_next;
|
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|
union _gc_head *gc_prev;
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|
Py_ssize_t gc_refs;
|
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|
|
} gc;
|
2012-12-10 22:05:05 -04:00
|
|
|
double dummy; /* force worst-case alignment */
|
2000-06-30 02:02:53 -03:00
|
|
|
} PyGC_Head;
|
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|
2002-05-04 02:36:06 -03:00
|
|
|
extern PyGC_Head *_PyGC_generation0;
|
2001-08-29 20:49:28 -03:00
|
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|
2002-03-28 17:06:16 -04:00
|
|
|
#define _Py_AS_GC(o) ((PyGC_Head *)(o)-1)
|
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|
2013-07-30 14:59:21 -03:00
|
|
|
/* Bit 0 is set when tp_finalize is called */
|
|
|
|
#define _PyGC_REFS_MASK_FINALIZED (1 << 0)
|
|
|
|
/* The (N-1) most significant bits contain the gc state / refcount */
|
|
|
|
#define _PyGC_REFS_SHIFT (1)
|
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|
|
#define _PyGC_REFS_MASK (((size_t) -1) << _PyGC_REFS_SHIFT)
|
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|
|
#define _PyGCHead_REFS(g) ((g)->gc.gc_refs >> _PyGC_REFS_SHIFT)
|
|
|
|
#define _PyGCHead_SET_REFS(g, v) do { \
|
|
|
|
(g)->gc.gc_refs = ((g)->gc.gc_refs & ~_PyGC_REFS_MASK) \
|
2014-03-14 22:15:29 -03:00
|
|
|
| (((size_t)(v)) << _PyGC_REFS_SHIFT); \
|
2013-07-30 14:59:21 -03:00
|
|
|
} while (0)
|
|
|
|
#define _PyGCHead_DECREF(g) ((g)->gc.gc_refs -= 1 << _PyGC_REFS_SHIFT)
|
|
|
|
|
|
|
|
#define _PyGCHead_FINALIZED(g) (((g)->gc.gc_refs & _PyGC_REFS_MASK_FINALIZED) != 0)
|
|
|
|
#define _PyGCHead_SET_FINALIZED(g, v) do { \
|
|
|
|
(g)->gc.gc_refs = ((g)->gc.gc_refs & ~_PyGC_REFS_MASK_FINALIZED) \
|
|
|
|
| (v != 0); \
|
|
|
|
} while (0)
|
|
|
|
|
|
|
|
#define _PyGC_FINALIZED(o) _PyGCHead_FINALIZED(_Py_AS_GC(o))
|
|
|
|
#define _PyGC_SET_FINALIZED(o, v) _PyGCHead_SET_FINALIZED(_Py_AS_GC(o), v)
|
|
|
|
|
|
|
|
#define _PyGC_REFS(o) _PyGCHead_REFS(_Py_AS_GC(o))
|
|
|
|
|
2010-05-09 12:52:27 -03:00
|
|
|
#define _PyGC_REFS_UNTRACKED (-2)
|
|
|
|
#define _PyGC_REFS_REACHABLE (-3)
|
|
|
|
#define _PyGC_REFS_TENTATIVELY_UNREACHABLE (-4)
|
2002-07-01 21:52:30 -03:00
|
|
|
|
2001-08-29 20:49:28 -03:00
|
|
|
/* Tell the GC to track this object. NB: While the object is tracked the
|
|
|
|
* collector it must be safe to call the ob_traverse method. */
|
|
|
|
#define _PyObject_GC_TRACK(o) do { \
|
2010-05-09 12:52:27 -03:00
|
|
|
PyGC_Head *g = _Py_AS_GC(o); \
|
2013-07-30 14:59:21 -03:00
|
|
|
if (_PyGCHead_REFS(g) != _PyGC_REFS_UNTRACKED) \
|
2010-05-09 12:52:27 -03:00
|
|
|
Py_FatalError("GC object already tracked"); \
|
2013-07-30 14:59:21 -03:00
|
|
|
_PyGCHead_SET_REFS(g, _PyGC_REFS_REACHABLE); \
|
2010-05-09 12:52:27 -03:00
|
|
|
g->gc.gc_next = _PyGC_generation0; \
|
|
|
|
g->gc.gc_prev = _PyGC_generation0->gc.gc_prev; \
|
|
|
|
g->gc.gc_prev->gc.gc_next = g; \
|
|
|
|
_PyGC_generation0->gc.gc_prev = g; \
|
2001-08-29 20:49:28 -03:00
|
|
|
} while (0);
|
|
|
|
|
2002-07-02 15:12:35 -03:00
|
|
|
/* Tell the GC to stop tracking this object.
|
|
|
|
* gc_next doesn't need to be set to NULL, but doing so is a good
|
|
|
|
* way to provoke memory errors if calling code is confused.
|
|
|
|
*/
|
2001-08-29 20:49:28 -03:00
|
|
|
#define _PyObject_GC_UNTRACK(o) do { \
|
2010-05-09 12:52:27 -03:00
|
|
|
PyGC_Head *g = _Py_AS_GC(o); \
|
2013-07-30 14:59:21 -03:00
|
|
|
assert(_PyGCHead_REFS(g) != _PyGC_REFS_UNTRACKED); \
|
|
|
|
_PyGCHead_SET_REFS(g, _PyGC_REFS_UNTRACKED); \
|
2010-05-09 12:52:27 -03:00
|
|
|
g->gc.gc_prev->gc.gc_next = g->gc.gc_next; \
|
|
|
|
g->gc.gc_next->gc.gc_prev = g->gc.gc_prev; \
|
|
|
|
g->gc.gc_next = NULL; \
|
2001-08-29 20:49:28 -03:00
|
|
|
} while (0);
|
|
|
|
|
2009-03-23 15:52:06 -03:00
|
|
|
/* True if the object is currently tracked by the GC. */
|
|
|
|
#define _PyObject_GC_IS_TRACKED(o) \
|
2013-07-30 14:59:21 -03:00
|
|
|
(_PyGC_REFS(o) != _PyGC_REFS_UNTRACKED)
|
2010-05-09 12:52:27 -03:00
|
|
|
|
2009-03-23 15:52:06 -03:00
|
|
|
/* True if the object may be tracked by the GC in the future, or already is.
|
|
|
|
This can be useful to implement some optimizations. */
|
|
|
|
#define _PyObject_GC_MAY_BE_TRACKED(obj) \
|
2010-05-09 12:52:27 -03:00
|
|
|
(PyObject_IS_GC(obj) && \
|
|
|
|
(!PyTuple_CheckExact(obj) || _PyObject_GC_IS_TRACKED(obj)))
|
2010-12-03 16:14:31 -04:00
|
|
|
#endif /* Py_LIMITED_API */
|
2009-03-23 15:52:06 -03:00
|
|
|
|
2016-09-11 05:03:14 -03:00
|
|
|
#ifndef Py_LIMITED_API
|
2014-05-02 17:31:14 -03:00
|
|
|
PyAPI_FUNC(PyObject *) _PyObject_GC_Malloc(size_t size);
|
|
|
|
PyAPI_FUNC(PyObject *) _PyObject_GC_Calloc(size_t size);
|
2016-09-11 05:03:14 -03:00
|
|
|
#endif /* !Py_LIMITED_API */
|
2002-08-12 04:21:58 -03:00
|
|
|
PyAPI_FUNC(PyObject *) _PyObject_GC_New(PyTypeObject *);
|
2006-02-15 13:27:45 -04:00
|
|
|
PyAPI_FUNC(PyVarObject *) _PyObject_GC_NewVar(PyTypeObject *, Py_ssize_t);
|
2002-08-12 04:21:58 -03:00
|
|
|
PyAPI_FUNC(void) PyObject_GC_Track(void *);
|
|
|
|
PyAPI_FUNC(void) PyObject_GC_UnTrack(void *);
|
|
|
|
PyAPI_FUNC(void) PyObject_GC_Del(void *);
|
2001-08-29 20:49:28 -03:00
|
|
|
|
|
|
|
#define PyObject_GC_New(type, typeobj) \
|
2010-05-09 12:52:27 -03:00
|
|
|
( (type *) _PyObject_GC_New(typeobj) )
|
2001-08-29 20:49:28 -03:00
|
|
|
#define PyObject_GC_NewVar(type, typeobj, n) \
|
2010-05-09 12:52:27 -03:00
|
|
|
( (type *) _PyObject_GC_NewVar((typeobj), (n)) )
|
2002-04-11 23:38:45 -03:00
|
|
|
|
2001-08-29 20:49:28 -03:00
|
|
|
|
2004-07-15 01:05:59 -03:00
|
|
|
/* Utility macro to help write tp_traverse functions.
|
|
|
|
* To use this macro, the tp_traverse function must name its arguments
|
|
|
|
* "visit" and "arg". This is intended to keep tp_traverse functions
|
|
|
|
* looking as much alike as possible.
|
|
|
|
*/
|
2010-05-09 12:52:27 -03:00
|
|
|
#define Py_VISIT(op) \
|
|
|
|
do { \
|
|
|
|
if (op) { \
|
|
|
|
int vret = visit((PyObject *)(op), arg); \
|
|
|
|
if (vret) \
|
|
|
|
return vret; \
|
|
|
|
} \
|
|
|
|
} while (0)
|
2004-07-14 16:08:17 -03:00
|
|
|
|
2000-06-23 16:37:02 -03:00
|
|
|
|
2001-02-01 01:27:45 -04:00
|
|
|
/* Test if a type supports weak references */
|
2006-07-27 18:53:35 -03:00
|
|
|
#define PyType_SUPPORTS_WEAKREFS(t) ((t)->tp_weaklistoffset > 0)
|
2001-02-01 01:27:45 -04:00
|
|
|
|
|
|
|
#define PyObject_GET_WEAKREFS_LISTPTR(o) \
|
2010-05-09 12:52:27 -03:00
|
|
|
((PyObject **) (((char *) (o)) + Py_TYPE(o)->tp_weaklistoffset))
|
2001-02-01 01:27:45 -04:00
|
|
|
|
1993-07-28 06:05:47 -03:00
|
|
|
#ifdef __cplusplus
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif /* !Py_OBJIMPL_H */
|