def doubleToRawLongBits(frame: Frame):
"""
public static native long doubleToRawLongBits(double value);
(D)J
:param frame:
:return:
"""
value = frame.local_vars.get_double(0)
s = struct.pack('>d', value)
bits = struct.unpack('>q', s)[0]
frame.operand_stack.push_numeric(bits)
def longBitsToDouble(frame: Frame):
"""
public static native double longBitsToDouble(long bits);
(J)D
:param frame:
:return:
"""
bits = frame.local_vars.get_numeric(0)
s = struct.pack('>q', bits)
value = struct.unpack('>d', s)[0]
frame.operand_stack.push_double(value)
jlDouble = "java/lang/Double"
register(jlDouble, "doubleToRawLongBits", "(D)J", doubleToRawLongBits)
register(jlDouble, "longBitsToDouble", "(J)D", longBitsToDouble)
def floatToRawIntBits(frame: Frame):
"""
public static native int floatToRawIntBits(float value);
(F)I
:param frame:
:return:
"""
value = frame.local_vars.get_float(0)
s = struct.pack('>f', value)
bits = struct.unpack('>l', s)[0]
frame.operand_stack.push_numeric(ctypes.c_int32(bits).value)
def intBitsToFloat(frame: Frame):
"""
public static native float intBitsToFloat(int bits);
(I)F
:param frame:
:return:
"""
bits = frame.local_vars.get_numeric(0)
s = struct.pack('>l', ctypes.c_uint32(bits).value)
value = struct.unpack('>f', s)[0]
frame.operand_stack.push_float(value)
jlFloat = "java/lang/Float"
register(jlFloat, "floatToRawIntBits", "(F)I", floatToRawIntBits)
register(jlFloat, "intBitsToFloat", "(I)F", intBitsToFloat)
#!/usr/bin/env python
# encoding: utf-8
"""
@author: HuRuiFeng
@file: VM.py
@time: 2019/9/21 15:31
@desc: VM
"""
from ch10.instructions.base import MethodInvokeLogic
from ch10.native.Registry import register
from ch10.rtda.Frame import Frame
from ch10.rtda.heap import StringPool
def initialize(frame: Frame):
vm_class = frame.method.get_class()
saved_props = vm_class.get_ref_var("savedProps", "Ljava/util/Properties;")
key = StringPool.j_string(vm_class.loader, "foo")
val = StringPool.j_string(vm_class.loader, "bar")
frame.operand_stack.push_ref(saved_props)
frame.operand_stack.push_ref(key)
frame.operand_stack.push_ref(val)
props_class = vm_class.loader.load_class("java/util/Properties")
set_prop_method = props_class.get_instance_method(
"setProperty",
"(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/Object;")
MethodInvokeLogic.invoke_method(frame, set_prop_method)
register("sun/misc/VM", "initialize", "()V", initialize)
:param frame:
:return:
"""
# 从局部变量表中拿到this引用
this = frame.local_vars.get_this()
# 有了this引用，通过get_class()方法拿到它的Class对象，通过j_class属性拿到类对象
clazz = this.get_class().j_class
# 把类对象推入操作数栈顶
frame.operand_stack.push_ref(clazz)
def hash_code(frame: Frame):
this = frame.local_vars.get_this()
hash_value = hash(this)
frame.operand_stack.push_numeric(hash_value)
def clone(frame: Frame):
this = frame.local_vars.get_this()
cloneable = this.get_class().loader.load_class("java/lang/Cloneable")
if not this.get_class().is_implements(cloneable):
raise RuntimeError("java.lang.CloneNotSupportedException")
frame.operand_stack.push_ref(this.clone())
jlObject = 'java/lang/Object'
register(jlObject, 'getClass', '()Ljava/lang/Class;', get_class)
register(jlObject, "hashCode", "()I", hash_code)
register(jlObject, "clone", "()Ljava/lang/Object;", clone)
return stes
# 计算所需跳过的帧数
def distance_to_object(clazz: Class):
distance = 0
c = clazz.super_class
while c is not None:
distance += 1
c = c.super_class
return distance
# 根据帧创建StackTraceElement实例
def create_stack_trace_element(frame):
method = frame.method
clazz = method.get_class()
stack_trace_element = StackTraceElement()
stack_trace_element.file_name = clazz.source_file
stack_trace_element.class_name = clazz.java_name
stack_trace_element.method_name = method.name
stack_trace_element.line_number = method.get_line_number(frame.next_pc - 1)
return stack_trace_element
jlThrowable = "java/lang/Throwable"
register(jlThrowable, "fillInStackTrace", "(I)Ljava/lang/Throwable;",
fill_in_stack_trace)
#!/usr/bin/env python
# encoding: utf-8
"""
@author: HuRuiFeng
@file: String.py
@time: 2019/9/21 10:56
@desc: java.lang.String类
"""
from ch10.native.Registry import register
from ch10.rtda.Frame import Frame
from ch10.rtda.heap import StringPool
def intern(frame: Frame):
this = frame.local_vars.get_this()
interned = StringPool.intern_string(this)
frame.operand_stack.push_ref(interned)
register("java/lang/String", "intern", "()Ljava/lang/String;", intern)
# 从局部变量表中拿到this引用，这是一个类对象引用
this = frame.local_vars.get_this()
# 通过extra获得与之对应的Class对象
clazz = this.extra
# 获取类名
name = clazz.java_name
# 转成Java字符串
name_obj = j_string(clazz.loader, name)
# 将其推入操作数栈顶
frame.operand_stack.push_ref(name_obj)
def desired_assertion_status_0(frame: Frame):
"""
private static native boolean desiredAssertionStatus0(Class<?> clazz);
:param frame:
:return:
"""
# 把false推入操作数栈顶
frame.operand_stack.push_boolean(False)
pass
register("java/lang/Class", "getPrimitiveClass",
"(Ljava/lang/String;)Ljava/lang/Class;", get_primitive_class)
register("java/lang/Class", "getName0", "()Ljava/lang/String;", get_name_0)
register("java/lang/Class", "desiredAssertionStatus0", "(Ljava/lang/Class;)Z",
desired_assertion_status_0)
if src is None and dest is None:
raise RuntimeError("java.lang.NullPointerException")
# 源数据和目标数据必须兼容才能拷贝，否则抛出ArrayStoreException异常
if not check_array_copy(src, dest):
raise RuntimeError("java.lang.ArrayStoreException")
# 检查src_pos、dest_pos和length参数，有问题则抛出IndexOutOfBoundsException异常
if src_pos < 0 or dest_pos < 0 or length < 0 \
or src_pos + length > src.array_length() \
or dest_pos + length > dest.array_length():
raise RuntimeError("java.lang.IndexOutOfBoundsException")
Object.array_copy(src, dest, src_pos, dest_pos, length)
def check_array_copy(src, dest) -> bool:
src_class = src.get_class()
dest_class = dest.get_class()
# 确保src和dest都是数组
if not src_class.is_array() or not dest_class.is_array():
return False
# 检查数组类型，如果两者都是引用数组，则可以拷贝，否则两者必须是相同类型的基本类型数组
if src_class.component_class().is_primitive() or dest_class.component_class().is_primitive():
return src_class == dest_class
return True
register("java/lang/System", "arraycopy",
"(Ljava/lang/Object;ILjava/lang/Object;II)V", arraycopy)