public static ConstantPoolInfo Read(ClassReader classReader)
{
ushort tag = classReader.ReadU1();
ConstantPoolInfo constantPoolInfo = null;
switch (tag)
{
case 7:
constantPoolInfo = new ConstantClass(); break;
case 9:
constantPoolInfo = new ConstantFieldRef(); break;
case 10:
constantPoolInfo = new ConstantMethodRef(); break;
case 11:
constantPoolInfo = new ConstantInterfaceMethodRef(); break;
case 8:
constantPoolInfo = new ConstantString(); break;
case 3:
constantPoolInfo = new ConstantInteger(); break;
case 4:
constantPoolInfo = new ConstantFloat(); break;
case 5:
constantPoolInfo = new ConstantLong(); break;
case 6:
constantPoolInfo = new ConstantDouble(); break;
case 12:
constantPoolInfo = new ConstantNameAndType(); break;
case 1:
constantPoolInfo = new ConstantUtf8(); break;
case 15:
constantPoolInfo = new ConstantMethodHandle(); break;
case 16:
constantPoolInfo = new ConstantMethodType(); break;
case 18:
constantPoolInfo = new ConstantInvokeDynamic(); break;
default:
throw new Exception("ClassFileError:constantPoolInfo incorrect");
}
constantPoolInfo.Tag = tag;
constantPoolInfo.ReadConstantPoolInfo(classReader);
return(constantPoolInfo);
}
public ConstantPool(ClassReader classReader, ushort length)
{
this.constantPoolInfos = new ConstantPoolInfo[length];
this.Length = length;
//i=0位置无效
for (int i = 1; i < this.Length; i++)
{
ConstantPoolInfo temp = ConstantPoolInfoReader.Read(classReader);
constantPoolInfos[i] = temp;
//long/double类型使得下一个位置无效，需跳过
if (temp.Tag == 5 || temp.Tag == 6)
{
i++;
}
}
}
public void StartJVM(ConsoleParam param)
{
//初始化指令集
Instruction.InitialInstructions();
Entry classPath = new ClassPath(param.JdkPath, param.Path);
byte[] classData = classPath.ReadClass(param.ClassName);
if (Switchs.DebugParse)
{
Console.Write(BitConverter.ToString(classData));
}
Console.WriteLine();
ClassFile classFile = ClassReader.Read(classData);
Interpreter interpreter = new Interpreter();
interpreter.interpret(classFile.Methods[1]);
Console.Write("finished with exit code 0");
}
protected ClassFile ReadClass(byte[] classData)
{
ClassReader classReader = new ClassReader();
this.classData = classData;
ReadMagic();
ReadVersion();
ReadConstantPoolSize();
ReadConstantPool();
ReadAccessFlag();
ReadThisClassIndex();
ReadSuperClassIndex();
ReadInterfaceCount();
ReadInterfaces();
ReadFieldsCount();
ReadFields();
ReadMethodsCount();
ReadMethods();
ReadAttributesCount();
ReadAttributes();
return(this.classFile);
}
public static ClassFile Read(byte[] classData)
{
ClassReader classReader = new ClassReader();
return(classReader.ReadClass(classData));
}
public abstract void ReadConstantPoolInfo(ClassReader classReader);
