package com.coderising.jvm.cmd;
import com.coderising.jvm.clz.ClassFile;
import com.coderising.jvm.constant.ConstantInfo;
import com.coderising.jvm.constant.ConstantPool;
import com.coderising.jvm.constant.StringInfo;
import com.coderising.jvm.engine.ExecutionResult;
import com.coderising.jvm.engine.Heap;
import com.coderising.jvm.engine.JavaObject;
import com.coderising.jvm.engine.StackFrame;
public class LdcCmd extends OneOperandCmd {
public LdcCmd(ClassFile clzFile,String opCode) {
super(clzFile,opCode);
}
@Override
public String toString() {
ConstantInfo info = getConstantInfo(this.getOperand());
String value = "TBD";
if(info instanceof StringInfo){
StringInfo strInfo = (StringInfo)info;
value = strInfo.toString();
}
return this.getOffset()+":"+this.getOpCode()+" " + this.getReadableCodeText() + " "+ value;
}
public void execute(StackFrame frame,ExecutionResult result){
ConstantPool pool = this.getConstantPool();
ConstantInfo info = (ConstantInfo)pool.getConstantInfo(this.getOperand());
if(info instanceof StringInfo){
StringInfo strInfo = (StringInfo)info;
String value = strInfo.toString();
JavaObject jo = Heap.getInstance().newString(value);
frame.getOprandStack().push(jo);
}
else{
//TBD 处理其他类型
throw new RuntimeException("Only support StringInfo constant");
}
}
}