--- old/src/share/vm/classfile/sharedPathsMiscInfo.hpp	2016-09-14 11:20:35.661455057 -0700
+++ new/src/share/vm/classfile/sharedPathsMiscInfo.hpp	2016-09-14 11:20:35.543446759 -0700
@@ -104,10 +104,28 @@
     add_path(path, NON_EXIST);
   }
 
+  // The path must exist and have required size and modification time
+  void add_required_file(const char* path) {
+    add_path(path, REQUIRED);
+
+    struct stat st;
+    if (os::stat(path, &st) != 0) {
+      assert(0, "sanity");
+#if INCLUDE_CDS
+      ClassLoader::exit_with_path_failure("failed to os::stat(%s)", path); // should not happen
+#endif
+    }
+    write_time(st.st_mtime);
+    write_long(st.st_size);
+  }
+
   // The path must exist, and must contain exactly <num_entries> files/dirs
   void add_boot_classpath(const char* path) {
     add_path(path, BOOT);
   }
+  void add_patch_mod_classpath(const char* path) {
+    add_path(path, PATCH_MOD);
+  }
   int write_jint(jint num) {
     write(&num, sizeof(num));
     return 0;
@@ -129,7 +147,8 @@
   enum {
     BOOT      = 1,
     NON_EXIST = 2,
-    REQUIRED  = 3
+    REQUIRED  = 3,
+    PATCH_MOD = 4
   };
 
   virtual const char* type_name(int type) {
@@ -137,6 +156,7 @@
     case BOOT:      return "BOOT";
     case NON_EXIST: return "NON_EXIST";
     case REQUIRED:  return "REQUIRED";
+    case PATCH_MOD: return "PATCH_MOD";
     default:        ShouldNotReachHere(); return "?";
     }
   }