Mercurial > hg > icedtea8-forest > hotspot

changeset 9268:a96cf90239c6 jdk8u102-b05

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Merge
author asaha
date Mon, 25 Apr 2016 11:01:13 -0700
parents b09a69142dd3 (current diff) 7c60503b0888 (diff)
children e0fa1c8d84cc
files .hgtags src/cpu/x86/vm/macroAssembler_x86.cpp src/share/vm/classfile/vmSymbols.hpp src/share/vm/opto/c2_globals.hpp src/share/vm/opto/compile.cpp src/share/vm/opto/library_call.cpp src/share/vm/opto/loopTransform.cpp src/share/vm/opto/node.cpp src/share/vm/opto/node.hpp src/share/vm/opto/phaseX.cpp
diffstat 12 files changed, 144 insertions(+), 36 deletions(-) [+]
line wrap: on
line diff
--- a/.hgtags	Mon Apr 25 09:32:00 2016 -0700
+++ b/.hgtags	Mon Apr 25 11:01:13 2016 -0700
@@ -598,6 +598,7 @@
 6824e2475e0432e27f9cc51838bc34ea5fbf5113 jdk8u40-b27
 8220f68a195f6eeed2f5fb6e8a303726b512e899 jdk8u40-b31
 850a290eb1088a61178d1910c500e170ef4f4386 jdk8u40-b32
+e6aa4a8c1b46a05b6c493b4ffe5c2555013f5c99 jdk8u40-b33
 1b3abbeee961dee49780c0e4af5337feb918c555 jdk8u40-b10
 f10fe402dfb1543723b4b117a7cba3ea3d4159f1 hs25.40-b15
 99372b2fee0eb8b3452f47230e84aa6e97003184 jdk8u40-b11
@@ -801,17 +802,28 @@
 a8e4754b89aecc388623394a20f6d43d4c58f083 jdk8u72-b13
 dc2fdd4e0b8105268b8231040f761f27ab4523f2 jdk8u72-b14
 d6670c5d49ba381405ec9f69a78ccc5b8b0c8473 jdk8u72-b15
+da43260704c28b9f19cb652090ae65c258220fd6 jdk8u72-b31
 26b99cd20661a1fa05939d1856a9389311e01c4f jdk8u73-b00
 931c31db01ae873525a1b2c306b01129eb431960 jdk8u73-b01
 67566d815a66d958c1f817d65f1621ba1d2e5f33 jdk8u73-b02
 451dda77f6c29bd3260e87f847a9eadae122a759 jdk8u74-b00
 c1031a924f2c910fad078838b88a2f0146f2de98 jdk8u74-b01
 ca9cae9aa9e989bbe6713c91d55c913edeaecce4 jdk8u74-b02
+a5b78b56841e97ce00463874f1b7f63c54d84934 jdk8u74-b31
+94ec11846b18111e73929b6caa9fbe7262e142c1 jdk8u74-b32
+1b6d4fd2730e58f17820930f797938dc182117c4 jdk8u77-b00
+ddd297e340b1170d3cec011ee64e729f8b493c86 jdk8u77-b01
+1b4072e4bb3ad54c4e894998486a8b33f0689160 jdk8u77-b02
+223b64a19e94222dd97b92bb40abcfbc0bf6ef1f jdk8u77-b03
+dd8507f51d786572dae18af8ffdc5a1ea34c755e jdk8u77-b31
+
+94ec11846b18111e73929b6caa9fbe7262e142c1 jdk8u74-b32
 da43260704c28b9f19cb652090ae65c258220fd6 jdk8u72-b31
 c0242ea4bde19d72be5149feda112a39e8c89b0a jdk8u75-b00
 ca3b8c8e390ab0540b0cc2e5def869b38e460d86 jdk8u75-b01
 9aef5b5e0a68f20059cfa9e2806b4ff0e11a3d31 jdk8u75-b02
 2df9fe896819362b9075a670b78106b249e50d6d jdk8u75-b03
+b374548dcb4834eb8731a06b52faddd0f10bd45d jdk8u101-b00
 32b682649973231b54740c09b10889660f6ebde5 jdk8u75-b04
 1f43bd4fab06d2ca5d1964611df14d8506d6b36e jdk8u75-b05
 916712f178c39d0acbc590f38802133fc86a7346 jdk8u75-b06
@@ -847,6 +859,13 @@
 481dcde745b6aec035781ed9f6797cfc93719f71 jdk8u92-b00
 f3e1e734e2d29101a9537ddeb71ecad413fcd352 jdk8u92-b13
 24a09407d71bb2cc4848bfa21660c890b4d722b1 jdk8u92-b14
+445941ba41c0e3829fe02140690b144281ac2141 jdk8u92-b31
+b374548dcb4834eb8731a06b52faddd0f10bd45d jdk8u81-b00
+ead07188d11107e877e8e4ad215ff6cb238a8a92 jdk8u101-b01
+34429bad9986677f4991c80aeb22665842881cba jdk8u101-b02
+b41d5faaf1d32ed1bf9592f65f2f94ddd4c60fc4 jdk8u101-b03
+ceecf88e5c2c09bfabf5926581e6d0b0f65f5148 jdk8u101-b04
+19e74265fc8def6a7fc96c836d8ebe38ad1cf199 jdk8u101-b05
 d6c92b9e192ef97305a699e868387d55821c81ad jdk8u102-b00
 d6c92b9e192ef97305a699e868387d55821c81ad jdk8u82-b00
 516a64e6d7c2dc29fd932bf3b8313e560a01bcd0 jdk8u102-b01
--- a/src/share/vm/classfile/dictionary.cpp	Mon Apr 25 09:32:00 2016 -0700
+++ b/src/share/vm/classfile/dictionary.cpp	Mon Apr 25 11:01:13 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,6 +25,7 @@
 #include "precompiled.hpp"
 #include "classfile/dictionary.hpp"
 #include "classfile/systemDictionary.hpp"
+#include "classfile/systemDictionaryShared.hpp"
 #include "memory/iterator.hpp"
 #include "oops/oop.inline.hpp"
 #include "prims/jvmtiRedefineClassesTrace.hpp"
@@ -36,9 +37,16 @@
 DictionaryEntry*  Dictionary::_current_class_entry = NULL;
 int               Dictionary::_current_class_index =    0;
 
+size_t Dictionary::entry_size() {
+  if (DumpSharedSpaces) {
+    return SystemDictionaryShared::dictionary_entry_size();
+  } else {
+    return sizeof(DictionaryEntry);
+  }
+}
 
 Dictionary::Dictionary(int table_size)
-  : TwoOopHashtable<Klass*, mtClass>(table_size, sizeof(DictionaryEntry)) {
+  : TwoOopHashtable<Klass*, mtClass>(table_size, (int)entry_size()) {
   _current_class_index = 0;
   _current_class_entry = NULL;
   _pd_cache_table = new ProtectionDomainCacheTable(defaultProtectionDomainCacheSize);
@@ -47,7 +55,7 @@
 
 Dictionary::Dictionary(int table_size, HashtableBucket<mtClass>* t,
                        int number_of_entries)
-  : TwoOopHashtable<Klass*, mtClass>(table_size, sizeof(DictionaryEntry), t, number_of_entries) {
+  : TwoOopHashtable<Klass*, mtClass>(table_size, (int)entry_size(), t, number_of_entries) {
   _current_class_index = 0;
   _current_class_entry = NULL;
   _pd_cache_table = new ProtectionDomainCacheTable(defaultProtectionDomainCacheSize);
@@ -63,6 +71,9 @@
   entry->set_loader_data(loader_data);
   entry->set_pd_set(NULL);
   assert(klass->oop_is_instance(), "Must be");
+  if (DumpSharedSpaces) {
+    SystemDictionaryShared::init_shared_dictionary_entry(klass, entry);
+  }
   return entry;
 }
 
--- a/src/share/vm/classfile/dictionary.hpp	Mon Apr 25 09:32:00 2016 -0700
+++ b/src/share/vm/classfile/dictionary.hpp	Mon Apr 25 11:01:13 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -53,6 +53,7 @@
   DictionaryEntry* get_entry(int index, unsigned int hash,
                              Symbol* name, ClassLoaderData* loader_data);
 
+protected:
   DictionaryEntry* bucket(int i) {
     return (DictionaryEntry*)Hashtable<Klass*, mtClass>::bucket(i);
   }
@@ -66,6 +67,8 @@
     Hashtable<Klass*, mtClass>::add_entry(index, (HashtableEntry<Klass*, mtClass>*)new_entry);
   }
 
+  static size_t entry_size();
+
 public:
   Dictionary(int table_size);
   Dictionary(int table_size, HashtableBucket<mtClass>* t, int number_of_entries);
--- a/src/share/vm/classfile/systemDictionary.cpp	Mon Apr 25 09:32:00 2016 -0700
+++ b/src/share/vm/classfile/systemDictionary.cpp	Mon Apr 25 11:01:13 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1198,8 +1198,13 @@
 
     if (ik->super() != NULL) {
       Symbol*  cn = ik->super()->name();
-      resolve_super_or_fail(class_name, cn,
-                            class_loader, protection_domain, true, CHECK_(nh));
+      Klass *s = resolve_super_or_fail(class_name, cn,
+                                       class_loader, protection_domain, true, CHECK_(nh));
+      if (s != ik->super()) {
+        // The dynamically resolved super class is not the same as the one we used during dump time,
+        // so we cannot use ik.
+        return nh;
+      }
     }
 
     Array<Klass*>* interfaces = ik->local_interfaces();
@@ -1212,7 +1217,12 @@
       // reinitialized yet (they will be once the interface classes
       // are loaded)
       Symbol*  name  = k->name();
-      resolve_super_or_fail(class_name, name, class_loader, protection_domain, false, CHECK_(nh));
+      Klass* i = resolve_super_or_fail(class_name, name, class_loader, protection_domain, false, CHECK_(nh));
+      if (k != i) {
+        // The dynamically resolved interface class is not the same as the one we used during dump time,
+        // so we cannot use ik.
+        return nh;
+      }
     }
 
     // Adjust methods to recover missing data.  They need addresses for
--- a/src/share/vm/classfile/systemDictionaryShared.hpp	Mon Apr 25 09:32:00 2016 -0700
+++ b/src/share/vm/classfile/systemDictionaryShared.hpp	Mon Apr 25 11:01:13 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -26,6 +26,7 @@
 #ifndef SHARE_VM_CLASSFILE_SYSTEMDICTIONARYSHARED_HPP
 #define SHARE_VM_CLASSFILE_SYSTEMDICTIONARYSHARED_HPP
 
+#include "classfile/dictionary.hpp"
 #include "classfile/systemDictionary.hpp"
 
 class SystemDictionaryShared: public SystemDictionary {
@@ -42,6 +43,22 @@
     oop class_loader = loader_data->class_loader();
     return (class_loader == NULL);
   }
+
+  static size_t dictionary_entry_size() {
+    return sizeof(DictionaryEntry);
+  }
+  static void init_shared_dictionary_entry(Klass* k, DictionaryEntry* entry) {}
+
+  // The (non-application) CDS implementation supports only classes in the boot
+  // class loader, which ensures that the verification dependencies are the same
+  // during archive creation time and runtime. Thus we can do the dependency checks
+  // entirely during archive creation time.
+  static void add_verification_dependency(Klass* k, Symbol* accessor_clsname,
+                                          Symbol* target_clsname) {}
+  static void finalize_verification_dependencies() {}
+  static bool check_verification_dependencies(Klass* k, Handle class_loader,
+                                              Handle protection_domain,
+                                              char** message_buffer, TRAPS) {return true;}
 };
 
 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARYSHARED_HPP
--- a/src/share/vm/classfile/verificationType.cpp	Mon Apr 25 09:32:00 2016 -0700
+++ b/src/share/vm/classfile/verificationType.cpp	Mon Apr 25 11:01:13 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -24,6 +24,7 @@
 
 #include "precompiled.hpp"
 #include "classfile/symbolTable.hpp"
+#include "classfile/systemDictionaryShared.hpp"
 #include "classfile/verificationType.hpp"
 #include "classfile/verifier.hpp"
 
@@ -73,7 +74,23 @@
       Klass* from_class = SystemDictionary::resolve_or_fail(
           from.name(), Handle(THREAD, klass->class_loader()),
           Handle(THREAD, klass->protection_domain()), true, CHECK_false);
-      return InstanceKlass::cast(from_class)->is_subclass_of(this_class());
+      bool result = InstanceKlass::cast(from_class)->is_subclass_of(this_class());
+      if (result && DumpSharedSpaces) {
+        if (klass()->is_subclass_of(from_class) && klass()->is_subclass_of(this_class())) {
+          // No need to save verification dependency. At run time, <klass> will be
+          // loaded from the archived only if <from_class> and <this_class> are
+          // also loaded from the archive. I.e., all 3 classes are exactly the same
+          // as we saw at archive creation time.
+        } else {
+          // Save the dependency. At run time, we need to check that the condition
+          // from_class->is_subclass_of(this_class() is still true.
+          Symbol* accessor_clsname = from.name();
+          Symbol* target_clsname = this_class()->name();
+          SystemDictionaryShared::add_verification_dependency(klass(),
+                       accessor_clsname, target_clsname);
+        }
+      }
+      return result;
     }
   } else if (is_array() && from.is_array()) {
     VerificationType comp_this = get_component(context, CHECK_false);
--- a/src/share/vm/interpreter/bytecodeStream.cpp	Mon Apr 25 09:32:00 2016 -0700
+++ b/src/share/vm/interpreter/bytecodeStream.cpp	Mon Apr 25 11:01:13 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -31,12 +31,12 @@
   // set next bytecode position
   address bcp = RawBytecodeStream::bcp();
   address end = method()->code_base() + end_bci();
-  int l = Bytecodes::raw_special_length_at(bcp, end);
-  if (l <= 0 || (_bci + l) > _end_bci) {
+  int len = Bytecodes::raw_special_length_at(bcp, end);
+  // Very large tableswitch or lookupswitch size can cause _next_bci to overflow.
+  if (len <= 0 || (_bci > _end_bci - len) || (_bci - len >= _next_bci)) {
     code = Bytecodes::_illegal;
   } else {
-    _next_bci += l;
-    assert(_bci < _next_bci, "length must be > 0");
+    _next_bci += len;
     // set attributes
     _is_wide = false;
     // check for special (uncommon) cases
--- a/src/share/vm/interpreter/bytecodeStream.hpp	Mon Apr 25 09:32:00 2016 -0700
+++ b/src/share/vm/interpreter/bytecodeStream.hpp	Mon Apr 25 11:01:13 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -149,12 +149,15 @@
     code        = Bytecodes::code_or_bp_at(bcp);
 
     // set next bytecode position
-    int l = Bytecodes::length_for(code);
-    if (l > 0 && (_bci + l) <= _end_bci) {
+    int len = Bytecodes::length_for(code);
+    if (len > 0 && (_bci <= _end_bci - len)) {
       assert(code != Bytecodes::_wide && code != Bytecodes::_tableswitch
              && code != Bytecodes::_lookupswitch, "can't be special bytecode");
       _is_wide = false;
-      _next_bci += l;
+      _next_bci += len;
+      if (_next_bci <= _bci) { // Check for integer overflow
+        code = Bytecodes::_illegal;
+      }
       _raw_code = code;
       return code;
     } else {
@@ -203,19 +206,23 @@
       // note that we cannot advance before having the
       // tty bytecode otherwise the stepping is wrong!
       // (carefull: length_for(...) must be used first!)
-      int l = Bytecodes::length_for(code);
-      if (l == 0) l = Bytecodes::length_at(_method(), bcp);
-      _next_bci  += l;
-      assert(_bci < _next_bci, "length must be > 0");
-      // set attributes
-      _is_wide      = false;
-      // check for special (uncommon) cases
-      if (code == Bytecodes::_wide) {
-        raw_code = (Bytecodes::Code)bcp[1];
-        code = raw_code;  // wide BCs are always Java-normal
-        _is_wide = true;
+      int len = Bytecodes::length_for(code);
+      if (len == 0) len = Bytecodes::length_at(_method(), bcp);
+      if (len <= 0 || (_bci > _end_bci - len) || (_bci - len >= _next_bci)) {
+        raw_code = code = Bytecodes::_illegal;
+      } else {
+        _next_bci  += len;
+        assert(_bci < _next_bci, "length must be > 0");
+        // set attributes
+        _is_wide      = false;
+        // check for special (uncommon) cases
+        if (code == Bytecodes::_wide) {
+          raw_code = (Bytecodes::Code)bcp[1];
+          code = raw_code;  // wide BCs are always Java-normal
+          _is_wide = true;
+        }
+        assert(Bytecodes::is_java_code(code), "sanity check");
       }
-      assert(Bytecodes::is_java_code(code), "sanity check");
     }
     _raw_code = raw_code;
     _code = code;
--- a/src/share/vm/memory/metaspaceShared.cpp	Mon Apr 25 09:32:00 2016 -0700
+++ b/src/share/vm/memory/metaspaceShared.cpp	Mon Apr 25 11:01:13 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -30,6 +30,7 @@
 #include "classfile/sharedClassUtil.hpp"
 #include "classfile/symbolTable.hpp"
 #include "classfile/systemDictionary.hpp"
+#include "classfile/systemDictionaryShared.hpp"
 #include "code/codeCache.hpp"
 #include "memory/filemap.hpp"
 #include "memory/gcLocker.hpp"
@@ -684,6 +685,10 @@
       exit(1);
     }
   }
+
+  // Copy the dependencies from C_HEAP-alloced GrowableArrays to RO-alloced
+  // Arrays
+  SystemDictionaryShared::finalize_verification_dependencies();
 }
 
 void MetaspaceShared::prepare_for_dumping() {
--- a/src/share/vm/oops/instanceKlass.cpp	Mon Apr 25 09:32:00 2016 -0700
+++ b/src/share/vm/oops/instanceKlass.cpp	Mon Apr 25 11:01:13 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,6 +25,7 @@
 #include "precompiled.hpp"
 #include "classfile/javaClasses.hpp"
 #include "classfile/systemDictionary.hpp"
+#include "classfile/systemDictionaryShared.hpp"
 #include "classfile/verifier.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "compiler/compileBroker.hpp"
@@ -706,6 +707,16 @@
 
         // also sets rewritten
         this_oop->rewrite_class(CHECK_false);
+      } else if (this_oop()->is_shared()) {
+        ResourceMark rm(THREAD);
+        char* message_buffer; // res-allocated by check_verification_dependencies
+        Handle loader = this_oop()->class_loader();
+        Handle pd     = this_oop()->protection_domain();
+        bool verified = SystemDictionaryShared::check_verification_dependencies(this_oop(),
+                        loader, pd, &message_buffer, THREAD);
+        if (!verified) {
+          THROW_MSG_(vmSymbols::java_lang_VerifyError(), message_buffer, false);
+        }
       }
 
       // relocate jsrs and link methods after they are all rewritten
--- a/src/share/vm/prims/whitebox.cpp	Mon Apr 25 09:32:00 2016 -0700
+++ b/src/share/vm/prims/whitebox.cpp	Mon Apr 25 11:01:13 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,6 +25,7 @@
 #include "precompiled.hpp"
 
 #include "memory/metadataFactory.hpp"
+#include "memory/metaspaceShared.hpp"
 #include "memory/universe.hpp"
 #include "oops/oop.inline.hpp"
 
@@ -914,6 +915,10 @@
   return (jlong) MetaspaceGC::capacity_until_GC();
 WB_END
 
+WB_ENTRY(jboolean, WB_IsSharedClass(JNIEnv* env, jobject wb, jclass clazz))
+  return (jboolean)MetaspaceShared::is_in_shared_space(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz)));
+WB_END
+
 WB_ENTRY(jboolean, WB_IsMonitorInflated(JNIEnv* env, jobject wb, jobject obj))
   oop obj_oop = JNIHandles::resolve(obj);
   return (jboolean) obj_oop->mark()->has_monitor();
@@ -1034,6 +1039,7 @@
   {CC"runMemoryUnitTests", CC"()V",                   (void*)&WB_RunMemoryUnitTests},
   {CC"readFromNoaccessArea",CC"()V",                  (void*)&WB_ReadFromNoaccessArea},
   {CC"stressVirtualSpaceResize",CC"(JJJ)I",           (void*)&WB_StressVirtualSpaceResize},
+  {CC"isSharedClass", CC"(Ljava/lang/Class;)Z",       (void*)&WB_IsSharedClass },
 #if INCLUDE_ALL_GCS
   {CC"g1InConcurrentMark", CC"()Z",                   (void*)&WB_G1InConcurrentMark},
   {CC"g1IsHumongous",      CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous     },
--- a/test/testlibrary/whitebox/sun/hotspot/WhiteBox.java	Mon Apr 25 09:32:00 2016 -0700
+++ b/test/testlibrary/whitebox/sun/hotspot/WhiteBox.java	Mon Apr 25 11:01:13 2016 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -233,4 +233,6 @@
     return offset;
   }
 
+  // Class Data Sharing
+  public native boolean isSharedClass(Class<?> c);
 }