package com.coderising.jvm.attr;
import java.util.Arrays;
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 {
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();
System.out.println("codeLen " + codeLen);
String code = iter.nextUxToHexString(codeLen);
ByteCodeCommand[] cmds = CommandParser.parse(clzFile, code);
CodeAttr codeAttr = new CodeAttr(attrNameIndex, attrLen, maxStack, maxLocals, codeLen, code, cmds);
System.out.println("Code is " + code);
System.out.println(Arrays.toString(cmds));
int exceptionTableLen = iter.nextU2ToInt();
if (exceptionTableLen > 0) {
String exTable = iter.nextUxToHexString(exceptionTableLen);
System.out.println("exception encounted " + exTable);
}
int sub_attrNum = iter.nextU2ToInt();
for (int i = 0; i < sub_attrNum; i++) {
int subAttrNameIndex = iter.nextU2ToInt();
String subAttrName = clzFile.getConstantPool().getUTF8String(subAttrNameIndex);
System.out.println("subAttrNameIndex is " + subAttrName);
iter.back(2);
if (AttributeInfo.LINE_NUM_TABLE.equalsIgnoreCase(subAttrName)) {
LineNumberTable lnt = LineNumberTable.parse(iter);
codeAttr.setLineNumberTable(lnt);
} else if (AttributeInfo.LOCAL_VAR_TABLE.equalsIgnoreCase(subAttrName)) {
LocalVariableTable lvt = LocalVariableTable.parse(iter);
codeAttr.setLocalVariableTable(lvt);
} else if (AttributeInfo.STACK_MAP_TABLE.equalsIgnoreCase(subAttrName)) {
StackMapTable smt = StackMapTable.parse(iter);
codeAttr.setStackMapTable(smt);
} else {
throw new RuntimeException(subAttrName + "not implemented yet");
}
}
return codeAttr;
}
private int maxStack ;
private int maxLocals ;
private int codeLen ;
private String code;
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 String getCode() {
return code;
}
public void setLineNumberTable(LineNumberTable t) {
this.lineNumTable = t;
}
public void setLocalVariableTable(LocalVariableTable t) {
this.localVarTable = t;
}
private void setStackMapTable(StackMapTable t) {
this.stackMapTable = t;
}
private ByteCodeCommand[] cmds ;
public ByteCodeCommand[] getCmds() {
return cmds;
}
public String toString(ConstantPool pool){
StringBuilder buffer = new StringBuilder();
//buffer.append("Code:").append(code).append("\n");
for(int i=0;i<cmds.length;i++){
buffer.append(cmds[i].toString(pool)).append("\n");
}
buffer.append("\n");
buffer.append(this.lineNumTable.toString());
buffer.append(this.localVarTable.toString(pool));
return buffer.toString();
}
}