python源码PyObject简单解析

最新推荐文章于 2023-04-08 16:49:32 发布

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最新推荐文章于 2023-04-08 16:49:32 发布 · 3.4k 阅读

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本文探讨了Python中对象的实现，特别是整数对象。Python的一切皆对象，每个对象包含一个双向链表、引用计数器和对象类型描述。对于整数对象，小整数对象池用于存储一定范围内的小整数，避免频繁的内存分配和释放；大整数对象则使用链表管理，并在删除时不会立即释放内存，而是加入到空闲链表中以供复用。

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1. python一切皆对象, 对象定义object.h

/* Define pointers to support a doubly-linked list of all live heap objects. */
#define _PyObject_HEAD_EXTRA            \
    struct _object *_ob_next;           \
    struct _object *_ob_prev;

/* PyObject_HEAD defines the initial segment of every PyObject. */
#define PyObject_HEAD                   \
    _PyObject_HEAD_EXTRA                \
    Py_ssize_t ob_refcnt;               \
    struct _typeobject *ob_type;

 /* 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,
 * in addition, be cast to PyVarObject*.
 */
typedef struct _object {
    PyObject_HEAD
} PyObject;

typedef struct {
    PyObject_VAR_HEAD
} PyVarObject;

PyObject包含了一个PyObject_HEAD, 任何python的对象都含他的指针

PyObject_HEAD包含一个双向