package com.github.miniyk2012.coding2017.coderising.jvm.attr;
import com.github.miniyk2012.coding2017.coderising.jvm.clz.ClassFile;
import com.github.miniyk2012.coding2017.coderising.jvm.cmd.ByteCodeCommand;
import com.github.miniyk2012.coding2017.coderising.jvm.cmd.CommandParser;
import com.github.miniyk2012.coding2017.coderising.jvm.constant.ConstantPool;
import com.github.miniyk2012.coding2017.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 attributeNameIndex = iter.nextU2toInt();
int attributeLength = iter.nextU4toInt();
int maxStack = iter.nextU2toInt();
int maxLocals = iter.nextU2toInt();
int codeLength = iter.nextU4toInt();
String code = iter.nextUxToHexString(codeLength);
ByteCodeCommand[] cmds = CommandParser.parse(clzFile, code);
CodeAttr codeAttr = new CodeAttr(attributeNameIndex, attributeLength, maxStack, maxLocals, codeLength, code, cmds);
int exceptionTableLen = iter.nextU2toInt();
if(exceptionTableLen>0){
String exTable = iter.nextUxToHexString(exceptionTableLen);
System.out.println("Encountered exception table , just ignore it :" + exTable);
}
int attributesCount = iter.nextU2toInt();
for (int i=0; i<attributesCount; i++) {
int subAttrIndex = iter.nextU2toInt();
String subAttrName = clzFile.getConstantPool().getUTF8String(subAttrIndex);
iter.skip(-2);
if (AttributeInfo.LINE_NUM_TABLE.equalsIgnoreCase(subAttrName)) {
LineNumberTable lineNumberTable = LineNumberTable.parse(iter);
codeAttr.setLineNumberTable(lineNumberTable);
} else if (AttributeInfo.LOCAL_VAR_TABLE.equalsIgnoreCase(subAttrName)) {
LocalVariableTable localVariableTable = LocalVariableTable.parse(iter);
codeAttr.setLocalVariableTable(localVariableTable);
} else if (AttributeInfo.STACK_MAP_TABLE.equalsIgnoreCase(subAttrName)) {
StackMapTable stackMapTable = StackMapTable.parse(iter);
codeAttr.setStackMapTable(stackMapTable);
} else {
throw new RuntimeException("Need code to process " + subAttrName);
}
}
return codeAttr;
}
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();
}
private void setStackMapTable(StackMapTable t) {
this.stackMapTable = t;
}
}