*** old/src/share/vm/code/nmethod.cpp	Tue Jan 14 12:43:57 2014
--- new/src/share/vm/code/nmethod.cpp	Tue Jan 14 12:43:57 2014

*** 2159,2178 ****
--- 2159,2200 ----
      return NULL;
    }
  }
  
  
! bool nmethod::check_all_dependencies() {
    bool found_check = false;
    // wholesale check of all dependencies
    for (Dependencies::DepStream deps(this); deps.next(); ) {
! void nmethod::check_all_dependencies(DepChange& changes) {
+   // Checked dependencies are allocated into this ResourceMark
+   ResourceMark rm;
+ 
+   // Turn off dependency tracing while actually testing dependencies.
+   NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );
+ 
+   // 'dep_signature_buffers' caches already checked dependencies.
+   DependencySignatureBuffer dep_signature_buffers;
+ 
+   // Iterate over live nmethods and check dependencies of all nmethods that are not
+   // marked for deoptimization. A particular dependency is only checked once.
+   for(nmethod* nm = CodeCache::alive_nmethod(CodeCache::first()); nm != NULL; nm = CodeCache::alive_nmethod(CodeCache::next(nm))) {
+     if (!nm->is_marked_for_deoptimization()) {
+       for (Dependencies::DepStream deps(nm); deps.next(); ) {
+         // Construct abstraction of a dependency.
+         DependencySignature current_sig(deps);
+         // Determine if 'deps' is already checked. If it is not checked,
+         // 'add_if_missing()' adds the dependency signature and returns
+         // false.
+         if (!dep_signature_buffers.add_if_missing(current_sig)) {
            if (deps.check_dependency() != NULL) {
!       found_check = true;
!       NOT_DEBUG(break);
!             ResourceMark rm;
!             tty->print_cr("Should have been marked for deoptimization:");
+             changes.print();
+             nm->print();
+             nm->print_dependencies();
+           }
+         }
+       }
      }
    }
    return found_check;  // tell caller if we found anything
  }
  
  bool nmethod::check_dependency_on(DepChange& changes) {
    // What has happened:
    // 1) a new class dependee has been added