fixed JIRA-227

Readme.html

@@ -283,7 +283,7 @@ see javassist.Dump.
 
 <p>-version 3.19
 <ul>
-<li>JIRA JASSIST-158, 205, 206, 207, 211, 212, 216, 223, 224.
+<li>JIRA JASSIST-158, 205, 206, 207, 211, 212, 216, 220, 223, 224, 227.
 </ul>
 </p>
 

src/main/javassist/bytecode/CodeIterator.java

@@ -126,6 +126,11 @@ public class CodeIterator implements Opcode {
      */
     public int byteAt(int index) { return bytecode[index] & 0xff; }
 
+    /**
+     * Returns the signed 8bit value at the given index.
+     */
+    public int signedByteAt(int index) { return bytecode[index]; }
+
     /**
      * Writes an 8bit value at the given index.
      */

src/main/javassist/bytecode/InstructionPrinter.java

@@ -116,7 +116,7 @@ public class InstructionPrinter implements Opcode {
             case IF_ICMPNE:
                 return opstring + " " + (iter.s16bitAt(pos + 1) + pos);
             case IINC:
-                return opstring + " " + iter.byteAt(pos + 1);
+                return opstring + " " + iter.byteAt(pos + 1) + ", " + iter.signedByteAt(pos + 2);
             case GOTO:
             case JSR:
                 return opstring + " " + (iter.s16bitAt(pos + 1) + pos);

src/main/javassist/tools/framedump.java

@@ -36,7 +36,7 @@ public class framedump {
      */
     public static void main(String[] args) throws Exception {
         if (args.length != 1) {
-            System.err.println("Usage: java javassist.tools.framedump <class file name>");
+            System.err.println("Usage: java javassist.tools.framedump <fully-qualified class name>");
             return;
         }