--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/gov/nasa/jpf/util/Invocation.java	Fri Jan 23 10:14:01 2015 -0800
@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2014, United States Government, as represented by the
+ * Administrator of the National Aeronautics and Space Administration.
+ * All rights reserved.
+ *
+ * The Java Pathfinder core (jpf-core) platform is licensed under the
+ * Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ *        http://www.apache.org/licenses/LICENSE-2.0. 
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and 
+ * limitations under the License.
+ */
+
+package gov.nasa.jpf.util;
+
+import gov.nasa.jpf.vm.ClassInfo;
+import gov.nasa.jpf.vm.ElementInfo;
+import gov.nasa.jpf.vm.MJIEnv;
+import gov.nasa.jpf.vm.VM;
+import gov.nasa.jpf.vm.MethodInfo;
+import gov.nasa.jpf.vm.ObjRef;
+
+/**
+ * a record that includes all information to perform a call
+ */
+public class Invocation {
+  MethodInfo mi;
+  Object[] args;  // includes 'this' for instance methods
+  Object[] attrs;
+  
+  public Invocation (MethodInfo mi, Object[] args, Object[] attrs){
+    this.mi = mi;
+    this.args = args;
+    this.attrs = attrs;
+  }
+  
+  public MethodInfo getMethodInfo () {
+    return mi;
+  }
+  
+  public Object[] getExplicitArguments () {
+    if (!mi.isStatic()){
+      Object[] a = new Object[args.length-1];
+      System.arraycopy(args,1,a,0,a.length);
+      return a;
+    } else {
+      return args;
+    }
+  }
+  
+  public String[] getArgumentTypeNames() {
+    return mi.getArgumentTypeNames();
+  }
+  
+  public String getArgumentValueLiteral(Object a) {
+    Class<?> cls = a.getClass();
+    
+    if (cls == Boolean.class)   return ((Boolean)a).toString();
+    if (cls == Byte.class)      return ((Byte)a).toString();
+    if (cls == Character.class) return ((Character)a).toString();
+    if (cls == Short.class)     return ((Short)a).toString();
+    if (cls == Integer.class)   return ((Integer)a).toString();
+    if (cls == Long.class)      return ((Long)a).toString();
+    if (cls == Float.class)     return ((Float)a).toString();
+    if (cls == Double.class)    return ((Double)a).toString();
+
+    if (cls == ObjRef.class) {
+      int ref = ((ObjRef)a).getReference();
+      
+      if (ref != MJIEnv.NULL){
+        ElementInfo ei = VM.getVM().getElementInfo(ref);
+        ClassInfo ci = ei.getClassInfo();
+        String cname = ci.getName();
+        if (cname.equals("java.lang.String")){
+          return "\"" + ei.asString() + '"';
+        } 
+        // <2do> we could probably do some more literals for java.lang.Class etc.
+      } else {
+        return "null";
+      }
+    }
+    
+    return null; // no literal representation
+  }
+  
+  public Object[] getArguments() {
+    return args;
+  }
+  
+  public Object[] getAttrs() {
+    return attrs;
+  }
+  
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder();
+    
+    sb.append("INVOKE[");
+    sb.append(mi.getName());
+    sb.append('(');
+    for (int i=0; i<args.length; i++){
+      if (i>0){
+        sb.append(',');
+      }
+      sb.append(args[i]);
+    }
+    sb.append(")]");
+    
+    return sb.toString();
+  }
+}