package com.coderising.jvm.cmd;
import com.coderising.jvm.clz.ClassFile;
import com.coderising.jvm.constant.ClassInfo;
import com.coderising.jvm.constant.ConstantPool;
import com.coderising.jvm.constant.FieldRefInfo;
import com.coderising.jvm.constant.NameAndTypeInfo;
import com.coderising.jvm.engine.ExecutionResult;
import com.coderising.jvm.engine.JavaObject;
import com.coderising.jvm.engine.StackFrame;
public class PutFieldCmd extends TwoOperandCmd {
public PutFieldCmd(ClassFile clzFile,String opCode) {
super(clzFile,opCode);
}
@Override
public String toString() {
return super.getOperandAsField();
}
@Override
public void execute(StackFrame frame,ExecutionResult result) {
FieldRefInfo fieldRef = (FieldRefInfo)this.getConstantInfo(this.getIndex());
ClassInfo clzInfo = (ClassInfo)this.getConstantInfo(fieldRef.getClassInfoIndex());
NameAndTypeInfo nameTypeInfo = (NameAndTypeInfo)this.getConstantInfo(fieldRef.getNameAndTypeIndex());
// for example : name
String fieldName = nameTypeInfo.getName();
// for example : Ljava/lang/String : 注意:我们不再检查类型
String fieldType = nameTypeInfo.getTypeInfo();
JavaObject fieldValue = frame.getOprandStack().pop();
JavaObject objectRef = frame.getOprandStack().pop();
objectRef.setFieldValue(fieldName, fieldValue);
}
}