def __init__(self):
# 访问标志
self.access_flags = 0
# 类名（完全限定名），具有java/lang/Object的形式
self.name = ""
# 超类名（完全限定名）
self.super_class_name = ""
# 接口名（完全限定名）
self.interface_names = []
# 运行时常量池指针
self.constant_pool = None
# 字段表
self.fields = []
# 方法表
self.methods = []
# 加载器
self.loader = None
# 超类
self.super_class = None
# 接口
self.interfaces = []
# 实例变量所占空间
self.instance_slot_count = 0
# 类变量所占空间
self.static_slot_count = 1
# 静态变量
self.static_vars = Slots()
# 表示类的<clinit>方法是否已经开始执行
self.init_started = False
# 表示java.lang.Class实例
self.j_class = None
def clone_data(self):
if not isinstance(self.data, Slots):
new_data = list(self.data)
return new_data
else:
new_data = Slots(len(self.data))
for i, slot in enumerate(self.data):
new_data[i] = copy_slot(slot)
return new_data
def alloc_and_init_static_vars(clazz: Class):
clazz.static_vars = Slots(clazz.static_slot_count)
for field in clazz.fields:
if field.is_static() and field.is_final():
ClassLoader.init_static_final_var(clazz, field)
def __init__(self, clazz: Class):
# 存放对象的class
self._class = clazz
# 存放实例变量
self.fields = Slots(clazz.instance_slot_count)
def new_object(clazz: Class):
return Object(clazz, Slots(clazz.instance_slot_count))
class Class:
def __init__(self):
# 访问标志
self.access_flags = 0
# 类名（完全限定名），具有java/lang/Object的形式
self.name = ""
# 超类名（完全限定名）
self.super_class_name = ""
# 接口名（完全限定名）
self.interface_names = []
# 运行时常量池指针
self.constant_pool = None
# 字段表
self.fields = []
# 方法表
self.methods = []
# 加载器
self.loader = None
# 超类
self.super_class = None
# 接口
self.interfaces = []
# 实例变量所占空间
self.instance_slot_count = 0
# 类变量所占空间
self.static_slot_count = 1
# 静态变量
self.static_vars = Slots()
# 表示类的<clinit>方法是否已经开始执行
self.init_started = False
# 表示java.lang.Class实例
self.j_class = None
# 用来把classFile类转换成Class类
@staticmethod
def new_class(classFile: ClassFile):
clazz = Class()
clazz.access_flags = classFile.access_flags
clazz.name = classFile.class_name
clazz.super_class_name = classFile.super_class_name
clazz.interface_names = classFile.interface_names
clazz.constant_pool = ConstantPool.new_constant_pool(clazz, classFile.constant_pool)
clazz.fields = Field.new_fields(clazz, classFile.fields)
clazz.methods = Method.new_methods(clazz, classFile.methods)
return clazz
# 用于判断public访问标志是否被设置
def is_public(self):
return 0 != self.access_flags & AccessFlags.ACC_PUBLIC
# 用于判断final访问标志是否被设置
def is_final(self):
return 0 != self.access_flags & AccessFlags.ACC_FINAL
# 用于判断super访问标志是否被设置
def is_super(self):
return 0 != self.access_flags & AccessFlags.ACC_SUPER
# 用于判断interface访问标志是否被设置
def is_interface(self):
return 0 != self.access_flags & AccessFlags.ACC_INTERFACE
# 用于判断abstract访问标志是否被设置
def is_abstract(self):
return 0 != self.access_flags & AccessFlags.ACC_ABSTRACT
# 用于判断synthetic访问标志是否被设置
def is_synthetic(self):
return 0 != self.access_flags & AccessFlags.ACC_SYNTHETIC
# 用于判断annotation访问标志是否被设置
def is_annotation(self):
return 0 != self.access_flags & AccessFlags.ACC_ANNOTATION
# 用于判断enum访问标志是否被设置
def is_enum(self):
return 0 != self.access_flags & AccessFlags.ACC_ENUM
# 类的访问控制权限
def is_accessible_to(self, otherClass):
"""
如果类D想访问类C，需要满足两个条件之一：C是pubilc，或者C和D在同一个运行时包内。
:param otherClass:
:return:
"""
return self.is_public() or self.get_package_name() == otherClass.get_package_name()
# 获取类所在的包名
def get_package_name(self):
i = self.name.rfind("/")
if i >= 0:
return self.name[:i]
return ""
def is_assignable_from(self, otherClass) -> bool:
"""
在三种情况下，S类型的引用值可以赋值给T类型：S和T是同一类型；T是类且S是T的子类；或者T是接口且S实现了T接口
:param otherClass:
:return:
"""
s, t = otherClass, self
if s == t:
return True
if not s.is_array():
if not s.is_interface():
if not t.is_interface():
return s.is_sub_class_of(t)
else:
return s.is_implements(t)
else:
if not t.is_interface():
return t.is_jl_object()
else:
return t.is_super_interface_of(s)
else:
if not t.is_array():
if not t.is_interface():
return t.is_jl_object()
else:
return t.is_jl_cloneable() or t.is_jio_serializable()
else:
sc = s.component_class()
tc = t.component_class()
return sc == tc or tc.is_assignable_from(sc)
# 判断S是否是T的子类，也就是判断T是否是S的（直接或间接）超类
def is_sub_class_of(self, otherClass):
c = self.super_class
while c:
if c == otherClass:
return True
c = c.super_class
return False
# 判断S是否实现了T接口
def is_implements(self, iface):
c = self
while c:
for interface in c.interfaces:
if interface == iface or interface.is_sub_interface_of(iface):
return True
return False
# 判断S是否实现了T的子接口
def is_sub_interface_of(self, iface):
for super_interface in self.interfaces:
if super_interface == iface or super_interface.is_sub_interface_of(iface):
return True
return False
# 判断S是否是T的超类
def is_super_class_of(self, otherClass):
return otherClass.is_sub_class_of(self)
def is_super_interface_of(self, iface):
return iface.is_sub_interface_of(self)
def get_main_method(self):
return self.get_static_method("main", "([Ljava/lang/String;)V")
def get_static_method(self, name, descriptor):
for method in self.methods:
if method.is_static() and method.name == name and method.descriptor == descriptor:
return method
return None
def new_object(self):
from rtda.heap.Object import Object
return Object.new_object(self)
def start_init(self):
self.init_started = True
def get_clinit_method(self):
return self.get_static_method("<clinit>", "()V")
# 数组类
def new_array(self, count):
from rtda.heap.Object import Object
if not self.is_array():
raise RuntimeError("Not array class: " + self.name)
return Object(self, [0 for _ in range(count)])
def is_array(self) -> bool:
return self.name[0] == '['
def is_jl_object(self):
return self.name == "java/lang/Object"
def is_jl_cloneable(self):
return self.name == "java/lang/Cloneable"
def is_jio_serializable(self):
return self.name == "java/io/Serializable"
def array_class(self):
"""
先根据类名得到数组类名，然后调用类加载器加载数组类。
:return:
"""
array_class_name = ClassNameHelper.get_array_class_name(self.name)
return self.loader.load_class(array_class_name)
# 返回数组类的元素类型
def component_class(self):
"""
先根据数组类名推测出数组元素类名，然后用类加载器加载元素类
:return:
"""
component_class_name = self.get_component_class_name(self.name)
return self.loader.load_class(component_class_name)
@staticmethod
def get_component_class_name(className):
# 数组类名以[开头，把它去掉就是数组元素的类型描述符
if className[0] == '[':
component_type_descriptor = className[1:]
return ClassNameHelper.to_class_name(component_type_descriptor)
# 根据字段名和描述符查找方法
def get_method(self, name, descriptor, is_static_flag):
c = self
while c:
for method in c.methods:
if method.is_static() == is_static_flag \
and method.name == name and method.descriptor == descriptor:
return method
c = c.super_class
return None
# 根据字段名和描述符查找字段
def get_field(self, name, descriptor, is_static_flag):
c = self
while c:
for field in c.fields:
if field.is_static() == is_static_flag \
and field.name == name and field.descriptor == descriptor:
return field
c = c.super_class
return None
# 返回转换后的类名,self.name形如java/lang/Object，转换后为java.lang.Object
@property
def java_name(self):
return self.name.replace("/", ".", -1)
# 判断类是否是基本类型的类
def is_primitive(self) -> bool:
if PrimitiveTypes.get(self.name) is not None:
return True
return False
def get_instance_method(self, name, descriptor):
return self.get_method(name, descriptor, False)
def get_ref_var(self, field_name, field_descriptor):
field = self.get_field(field_name, field_descriptor, True)
return self.static_vars.get_ref(field.slot_id)
def set_ref_var(self, field_name, field_descriptor, ref):
field = self.get_field(field_name, field_descriptor, True)
self.static_vars.set_ref(field.slot_id, ref)
