package com.coderising.jvm.attr;
import com.coderising.jvm.clz.ClassFile;
import com.coderising.jvm.cmd.ByteCodeCommand;
import com.coderising.jvm.cmd.CommandParser;
import com.coderising.jvm.constant.ConstantPool;
import com.coderising.jvm.loader.ByteCodeIterator;
public class CodeAttr extends AttributeInfo {
private int maxStack ;
private int maxLocals ;
private int codeLen ;
private String code;
public String getCode() {
return code;
}
private ByteCodeCommand[] cmds ;
public ByteCodeCommand[] getCmds() {
return cmds;
}
private LineNumberTable lineNumTable;
private LocalVariableTable localVarTable;
private StackMapTable stackMapTable;
public CodeAttr(int attrNameIndex, int attrLen, int maxStack, int maxLocals, int codeLen, String code, ByteCodeCommand[] cmds) {
super(attrNameIndex, attrLen);
this.maxStack = maxStack;
this.maxLocals = maxLocals;
this.codeLen = codeLen;
this.code = code;
this.cmds = cmds;
}
public void setLineNumberTable(LineNumberTable t) {
this.lineNumTable = t;
}
public void setLocalVariableTable(LocalVariableTable t) {
this.localVarTable = t;
}
public static CodeAttr parse(ClassFile clzFile, ByteCodeIterator iter){
int attrNameIndex = iter.nextU2ToInt();
int attrLen = iter.nextU4ToInt();
int maxStack = iter.nextU2ToInt();
int maxLocals = iter.nextU2ToInt();
int codeLen = iter.nextU4ToInt();
String code = iter.nextUxToHexString(codeLen);
ByteCodeCommand[] commands = CommandParser.parse(clzFile, code);
CodeAttr attr = new CodeAttr(attrNameIndex, attrLen, maxStack, maxLocals, codeLen, code, commands);
int expTableLen = iter.nextU2ToInt();
if(expTableLen > 0){
String expTable = iter.nextUxToHexString(expTableLen);
System.out.println("expTable: " + expTable);
// TODO 异常表处理
}
int subAttrCount = iter.nextU2ToInt();
ConstantPool pool = clzFile.getConstantPool();
for (int i = 1; i <= subAttrCount; i++) {
int subAttrNameIndex = iter.nextU2ToInt();
String subAttrName = pool.getUTF8String(subAttrNameIndex);
iter.back(2);
if(AttributeInfo.LINE_NUM_TABLE.equalsIgnoreCase(subAttrName)){
attr.setLineNumberTable(LineNumberTable.parse(iter));
}else if(AttributeInfo.LOCAL_VAR_TABLE.equalsIgnoreCase(subAttrName)){
attr.setLocalVariableTable(LocalVariableTable.parse(iter));
}else if(AttributeInfo.STACK_MAP_TABLE.equalsIgnoreCase(subAttrName)){
attr.setStackMapTable(StackMapTable.parse(iter));
}else{
//TODO
throw new RuntimeException("CodeAttr.parse not implement " + subAttrName);
}
}
return attr;
}
private void setStackMapTable(StackMapTable t) {
this.stackMapTable = t;
}
}