package com.coderising.jvm.attr;
import com.coderising.jvm.clz.ClassFile;
import com.coderising.jvm.loader.ByteCodeIterator;
public class CodeAttr extends AttributeInfo {
private int maxStack;
private int maxLocals;
private int codeLen;
private String 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 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);
System.out.println("Code: " + code);
CodeAttr codeAttr = new CodeAttr(attrNameIndex, attrLen, maxStack, maxLocals, codeLen, code);
int exceptionCodeLen = iter.nextU2ToInt();
if (exceptionCodeLen > 0) {
String exTable = iter.nextUxToHexString(exceptionCodeLen);
System.out.println("Encountered exception table, just ignore it");
}
int subAttrCount = iter.nextU2ToInt();
for (int i = 0; i < subAttrCount; i++) {
int subAttrIndex = iter.nextU2ToInt();
String subAttrName = clzFile.getConstantPool().getUTF8String(subAttrIndex);
iter.back(2);
if (AttributeInfo.LINE_NUM_TABLE.equalsIgnoreCase(subAttrName)) {
LineNumberTable t = LineNumberTable.parse(iter);
codeAttr.setLineNumberTable(t);
} else if (AttributeInfo.LOCAL_VAR_TABLE.equalsIgnoreCase(subAttrName)) {
LocalVariableTable t = LocalVariableTable.parse(iter);
codeAttr.setLocalVariableTable(t);
} else if (AttributeInfo.STACK_MAP_TABLE.equalsIgnoreCase(subAttrName)) {
StackMapTable t = StackMapTable.parse(iter);
codeAttr.setStackMapTable(t);
} else {
throw new RuntimeException(subAttrName + " hasn't been implemented yet");
}
}
return codeAttr;
}
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;
}
}