178 строки
4.2 KiB
Python
178 строки
4.2 KiB
Python
# SPDX-License-Identifier: GPL-2.0
|
|
#
|
|
# Copyright 2019 Google LLC.
|
|
|
|
import gdb
|
|
|
|
from linux import utils
|
|
|
|
rb_root_type = utils.CachedType("struct rb_root")
|
|
rb_node_type = utils.CachedType("struct rb_node")
|
|
|
|
|
|
def rb_first(root):
|
|
if root.type == rb_root_type.get_type():
|
|
node = node.address.cast(rb_root_type.get_type().pointer())
|
|
elif root.type != rb_root_type.get_type().pointer():
|
|
raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
|
|
|
|
node = root['rb_node']
|
|
if node is 0:
|
|
return None
|
|
|
|
while node['rb_left']:
|
|
node = node['rb_left']
|
|
|
|
return node
|
|
|
|
|
|
def rb_last(root):
|
|
if root.type == rb_root_type.get_type():
|
|
node = node.address.cast(rb_root_type.get_type().pointer())
|
|
elif root.type != rb_root_type.get_type().pointer():
|
|
raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
|
|
|
|
node = root['rb_node']
|
|
if node is 0:
|
|
return None
|
|
|
|
while node['rb_right']:
|
|
node = node['rb_right']
|
|
|
|
return node
|
|
|
|
|
|
def rb_parent(node):
|
|
parent = gdb.Value(node['__rb_parent_color'] & ~3)
|
|
return parent.cast(rb_node_type.get_type().pointer())
|
|
|
|
|
|
def rb_empty_node(node):
|
|
return node['__rb_parent_color'] == node.address
|
|
|
|
|
|
def rb_next(node):
|
|
if node.type == rb_node_type.get_type():
|
|
node = node.address.cast(rb_node_type.get_type().pointer())
|
|
elif node.type != rb_node_type.get_type().pointer():
|
|
raise gdb.GdbError("Must be struct rb_node not {}".format(node.type))
|
|
|
|
if rb_empty_node(node):
|
|
return None
|
|
|
|
if node['rb_right']:
|
|
node = node['rb_right']
|
|
while node['rb_left']:
|
|
node = node['rb_left']
|
|
return node
|
|
|
|
parent = rb_parent(node)
|
|
while parent and node == parent['rb_right']:
|
|
node = parent
|
|
parent = rb_parent(node)
|
|
|
|
return parent
|
|
|
|
|
|
def rb_prev(node):
|
|
if node.type == rb_node_type.get_type():
|
|
node = node.address.cast(rb_node_type.get_type().pointer())
|
|
elif node.type != rb_node_type.get_type().pointer():
|
|
raise gdb.GdbError("Must be struct rb_node not {}".format(node.type))
|
|
|
|
if rb_empty_node(node):
|
|
return None
|
|
|
|
if node['rb_left']:
|
|
node = node['rb_left']
|
|
while node['rb_right']:
|
|
node = node['rb_right']
|
|
return node.dereference()
|
|
|
|
parent = rb_parent(node)
|
|
while parent and node == parent['rb_left'].dereference():
|
|
node = parent
|
|
parent = rb_parent(node)
|
|
|
|
return parent
|
|
|
|
|
|
class LxRbFirst(gdb.Function):
|
|
"""Lookup and return a node from an RBTree
|
|
|
|
$lx_rb_first(root): Return the node at the given index.
|
|
If index is omitted, the root node is dereferenced and returned."""
|
|
|
|
def __init__(self):
|
|
super(LxRbFirst, self).__init__("lx_rb_first")
|
|
|
|
def invoke(self, root):
|
|
result = rb_first(root)
|
|
if result is None:
|
|
raise gdb.GdbError("No entry in tree")
|
|
|
|
return result
|
|
|
|
|
|
LxRbFirst()
|
|
|
|
|
|
class LxRbLast(gdb.Function):
|
|
"""Lookup and return a node from an RBTree.
|
|
|
|
$lx_rb_last(root): Return the node at the given index.
|
|
If index is omitted, the root node is dereferenced and returned."""
|
|
|
|
def __init__(self):
|
|
super(LxRbLast, self).__init__("lx_rb_last")
|
|
|
|
def invoke(self, root):
|
|
result = rb_last(root)
|
|
if result is None:
|
|
raise gdb.GdbError("No entry in tree")
|
|
|
|
return result
|
|
|
|
|
|
LxRbLast()
|
|
|
|
|
|
class LxRbNext(gdb.Function):
|
|
"""Lookup and return a node from an RBTree.
|
|
|
|
$lx_rb_next(node): Return the node at the given index.
|
|
If index is omitted, the root node is dereferenced and returned."""
|
|
|
|
def __init__(self):
|
|
super(LxRbNext, self).__init__("lx_rb_next")
|
|
|
|
def invoke(self, node):
|
|
result = rb_next(node)
|
|
if result is None:
|
|
raise gdb.GdbError("No entry in tree")
|
|
|
|
return result
|
|
|
|
|
|
LxRbNext()
|
|
|
|
|
|
class LxRbPrev(gdb.Function):
|
|
"""Lookup and return a node from an RBTree.
|
|
|
|
$lx_rb_prev(node): Return the node at the given index.
|
|
If index is omitted, the root node is dereferenced and returned."""
|
|
|
|
def __init__(self):
|
|
super(LxRbPrev, self).__init__("lx_rb_prev")
|
|
|
|
def invoke(self, node):
|
|
result = rb_prev(node)
|
|
if result is None:
|
|
raise gdb.GdbError("No entry in tree")
|
|
|
|
return result
|
|
|
|
|
|
LxRbPrev()
|