8229345: Memory leak due to vtable stubs not being shared on SPARC

Reviewed-by: mdoerr, dholmes, kvn

src/cpu/ppc/vm/globals_ppc.hpp

 /*
- * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2019, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2012, 2018 SAP AG. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -33,10 +33,8 @@
 // (see globals.hpp)
 
 define_pd_global(bool, ConvertSleepToYield,   true);
-define_pd_global(bool, ShareVtableStubs,      false); // Improves performance markedly for mtrt and compress.
 define_pd_global(bool, NeedsDeoptSuspend,     false); // Only register window machines need this.
 
-
 define_pd_global(bool, ImplicitNullChecks,    true);  // Generate code for implicit null checks.
 define_pd_global(bool, TrapBasedNullChecks,   true);
 define_pd_global(bool, UncommonNullCast,      true);  // Uncommon-trap NULLs passed to check cast.

src/cpu/sparc/vm/globals_sparc.hpp

 /*
- * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2019, 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
@@ -38,7 +38,6 @@
 // according to the prior table. So, we let the thread continue and let it block by itself.
 define_pd_global(bool, DontYieldALot,               true);  // yield no more than 100 times per second
 define_pd_global(bool, ConvertSleepToYield,         false); // do not convert sleep(0) to yield. Helps GUI
-define_pd_global(bool, ShareVtableStubs,            false); // improves performance markedly for mtrt and compress
 define_pd_global(bool, CountInterpCalls,            false); // not implemented in the interpreter
 define_pd_global(bool, NeedsDeoptSuspend,           true); // register window machines need this
 

src/cpu/x86/vm/globals_x86.hpp

 /*
- * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2019, 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
@@ -32,7 +32,6 @@
 // (see globals.hpp)
 
 define_pd_global(bool, ConvertSleepToYield,      true);
-define_pd_global(bool, ShareVtableStubs,         true);
 define_pd_global(bool, CountInterpCalls,         true);
 define_pd_global(bool, NeedsDeoptSuspend,        false); // only register window machines need this
 

src/cpu/zero/vm/globals_zero.hpp

 /*
- * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2007, 2008, 2009, 2010, 2011 Red Hat, Inc.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -33,7 +33,6 @@
 // runtime system.  See globals.hpp for details of what they do.
 
 define_pd_global(bool,  ConvertSleepToYield,  true);
-define_pd_global(bool,  ShareVtableStubs,     true);
 define_pd_global(bool,  CountInterpCalls,     true);
 define_pd_global(bool,  NeedsDeoptSuspend,    false);
 

src/share/vm/code/vtableStubs.cpp

 /*
- * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2019, 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
@@ -110,7 +110,7 @@ void VtableStubs::initialize() {
 address VtableStubs::find_stub(bool is_vtable_stub, int vtable_index) {
   assert(vtable_index >= 0, "must be positive");
 
-  VtableStub* s = ShareVtableStubs ? lookup(is_vtable_stub, vtable_index) : NULL;
+  VtableStub* s = lookup(is_vtable_stub, vtable_index);
   if (s == NULL) {
     if (is_vtable_stub) {
       s = create_vtable_stub(vtable_index);

src/share/vm/runtime/globals.hpp

 /*
- * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2019, 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
@@ -1180,9 +1180,6 @@ class CommandLineFlags {
   product(bool, ReduceSignalUsage, false,                                   \
           "Reduce the use of OS signals in Java and/or the VM")             \
                                                                             \
-  develop_pd(bool, ShareVtableStubs,                                        \
-          "Share vtable stubs (smaller code but worse branch prediction")   \
-                                                                            \
   develop(bool, LoadLineNumberTables, true,                                 \
           "Tell whether the class file parser loads line number tables")    \
                                                                             \