support for java 8

Author: anmol-ap

pom.xml

@@ -15,11 +15,13 @@
   </properties>
 
   <dependencies>
-    <dependency>
-      <groupId>javassist</groupId>
-      <artifactId>javassist</artifactId>
-      <version>3.12.1.GA</version>
-    </dependency>
+    <!-- https://mvnrepository.com/artifact/org.javassist/javassist -->
+<dependency>
+    <groupId>org.javassist</groupId>
+    <artifactId>javassist</artifactId>
+    <version>3.23.0-GA</version>
+</dependency>
+
     <dependency>
       <groupId>log4j</groupId>
       <artifactId>log4j</artifactId>

src/bytecodeparser/CodeParser.java

@@ -50,7 +50,9 @@ public void parse(OpHandler opHandler) throws BadBytecode {
 			if(stop)
 				break;
 			int index = context.iterator.next();
-			Op op = Opcodes.OPCODES.get(context.iterator.byteAt(index)).init(context, index);
+			Op opcode = Opcodes.OPCODES.get(context.iterator.byteAt(index));
+            if(opcode == null) continue;
+            Op op = opcode.init(context, index);
 			opHandler.handle(op, index);
 		}
 	}
@@ -86,4 +88,4 @@ public void begin() {
 	public void stop() {
 		stop = true;
 	}
-}
+}

src/bytecodeparser/analysis/decoders/DecodedMethodInvocationOp.java

@@ -106,7 +106,7 @@ public void simulate(Stack stack) {
 				se = stack.pop2();
 			else se = stack.pop();
 		}
-		if(op.as(MethodInvocationOpcode.class).isInstanceMethod())
+		if (op.as(MethodInvocationOpcode.class).isInstanceMethod() && !stack.isEmpty())
 			stack.pop();
 		if(returnTypeLength != null) {
 			if(returnTypeLength == DOUBLE)
@@ -326,4 +326,4 @@ public MethodParam[] merge() {
 			return result;
 		}
 	}
-}
+}

src/bytecodeparser/analysis/stack/StackAnalyzer.java

@@ -113,7 +113,9 @@ void analyze(int from, Stack stack) throws BadBytecode {
 			Stack currentStack = stack.copy();
 			while(iterator.hasNext()) {
 				int index = iterator.next();
-				Op op = Opcodes.OPCODES.get(iterator.byteAt(index)).init(context, index);
+				Op opcode = Opcodes.OPCODES.get(iterator.byteAt(index));
+                if(opcode == null) continue;
+                Op op = opcode.init(context, index);
 				trace.append("\n").append(index).append(":").append(op.getName()).append(" --> ");
 				Frame frame = frames[index];
 				frame.isAccessible = true;
@@ -332,4 +334,4 @@ protected void updateCursors(int pos, int length) {
 			}
 		}
 	}
-}
+}