*** old/src/share/vm/classfile/sharedPathsMiscInfo.hpp	Fri Sep 16 09:33:52 2016
--- new/src/share/vm/classfile/sharedPathsMiscInfo.hpp	Fri Sep 16 09:33:52 2016

*** 102,115 ****
--- 102,133 ----
    // The path must not exist at run-time
    void add_nonexist_path(const char* path) {
      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;
    }
    void write_time(time_t t) {

*** 127,144 ****
--- 145,164 ----
    // reading --
  
    enum {
      BOOT      = 1,
      NON_EXIST = 2,
!     REQUIRED  = 3,
+     PATCH_MOD = 4
    };
  
    virtual const char* type_name(int type) {
      switch (type) {
      case BOOT:      return "BOOT";
      case NON_EXIST: return "NON_EXIST";
      case REQUIRED:  return "REQUIRED";
+     case PATCH_MOD: return "PATCH_MOD";
      default:        ShouldNotReachHere(); return "?";
      }
    }
  
    virtual void print_path(int type, const char* path);