Python源码入门学习心得-初始化(一)
Python源码入门学习心得-初始化(一)
有点杂...林乱记了几个点,以后整理,主要是一些基本的数据结构Build好python的源码以后,直接debug运行,python就对进入 main.c
int Py_Main(int argc, wchar_t **argv)
完成一系列的初始化操作.
================================================
PyObject是Python源码里面最基本的struct
in pystate.c
static PyInterpreterState *interp_head = NULL;
PyInterpreterState * PyInterpreterState_New(void)
{
...
}
这个PyInterpreterState就像python的状态管理器之类
每调用一次函数,就生成一个新节点,并且用interp_head指向之, 挂在链表最前端
in pythonrun.c
PyThreadState *tstate;
tstate = PyThreadState_New(interp);
{
tstate->next = interp->tstate_head;
interp->tstate_head = tstate;
}
借用了interp->tstate_head 作为PyThreadState链表的头指针
初始化以后,各有一个指针指向对方如下图
默认的函数定义列表
static PyMethodDef object_methods[] = {
{"__reduce_ex__", object_reduce_ex, METH_VARARGS,
PyDoc_STR("helper for pickle")},
{"__reduce__", object_reduce, METH_VARARGS,
PyDoc_STR("helper for pickle")},
{"__subclasshook__", object_subclasshook, METH_CLASS | METH_VARARGS,
object_subclasshook_doc},
{"__format__", object_format, METH_VARARGS,
PyDoc_STR("default object formatter")},
{"__sizeof__", object_sizeof, METH_NOARGS,
PyDoc_STR("__sizeof__() -> size of object in memory, in bytes")},
{0}
};
PyTypeObject PyBaseObject_Type = {
...
object_methods, /* tp_methods */
...
};
PyBaseObject_Type里面有系统预定义好的一些方法
bltinmodule.c
包含了一些内置函数的实现,文档定义,例如
static PyObject *
builtin_dir(PyObject *self, PyObject *args)
{
PyObject *arg = NULL;
if (!PyArg_UnpackTuple(args, "dir", 0, 1, &arg))
return NULL;
return PyObject_Dir(arg);
}
PyDoc_STRVAR(dir_doc,
"dir([object]) -> list of strings\n"
"\n"
"If called without an argument, return the names in the current scope.\n"
"Else, return an alphabetized list of names comprising (some of) the attributes\n"
....
" recursively the attributes of its class's base classes.");
static struct PyModuleDef builtinsmodule = {
PyModuleDef_HEAD_INIT,
"builtins",
builtin_doc,
-1, /* multiple "initialization" just copies the module dict. */
builtin_methods,
NULL,
NULL,
NULL,
NULL
};
static PyMethodDef builtin_methods[] = {
...
{"dir", builtin_dir, METH_VARARGS, dir_doc},
{"divmod", builtin_divmod, METH_VARARGS, divmod_doc},
...
{NULL, NULL},
};
初始化的时候调用 mod = PyModule_Create(&builtinsmodule);
==============================================
In object.h
/* PyObject_HEAD defines the initial segment of every PyObject. */
#define PyObject_HEAD PyObject ob_base;
于是PyModuleObject的类图
In moduleobject.c
有PyTypeObject对象 PyModule_Type的定义
PyTypeObject PyModule_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"module", /* tp_name */
sizeof(PyModuleObject), /* tp_size */
0, /* tp_itemsize */
(destructor)module_dealloc, /* tp_dealloc */
...
PyObject_GenericGetAttr, /* tp_getattro */
PyObject_GenericSetAttr, /* tp_setattro */
...
(traverseproc)module_traverse, /* tp_traverse */
(inquiry)module_clear, /* tp_clear */
...
module_members, /* tp_members */
... /* tp_descr_set */
offsetof(PyModuleObject, md_dict), /* tp_dictoffset */
(initproc)module_init, /* tp_init */
PyType_GenericAlloc, /* tp_alloc */
PyType_GenericNew, /* tp_new */
PyObject_GC_Del, /* tp_free */
};
其中module_members的定义
static PyMemberDef module_members[] = {
{"__dict__", T_OBJECT, offsetof(PyModuleObject, md_dict), READONLY},
{0}
};
object.c
void _Py_AddToAllObjects(PyObject *op, int force)
Insert op at the front of the list of all objects
Ref->OP2->OP1->OP0....
pythonrun.c
void
Py_InitializeEx(int install_sigs)
bimod = _PyBuiltin_Init();
interp->builtins = PyModule_GetDict(bimod);
sysmod = _PySys_Init();
interp->sysdict = PyModule_GetDict(sysmod
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