Merge

make/bsd/makefiles/jsig.make

@@ -62,7 +62,7 @@ endif
 $(LIBJSIG): $(JSIGSRCDIR)/jsig.c $(LIBJSIG_MAPFILE)
 	@echo Making signal interposition lib...
 	$(QUIETLY) $(CC) $(SYMFLAG) $(ARCHFLAG) $(SHARED_FLAG) $(PICFLAG) \
-                         $(LFLAGS_JSIG) $(JSIG_DEBUG_CFLAGS) -o $@ $<
+                         $(LFLAGS_JSIG) $(JSIG_DEBUG_CFLAGS) $(EXTRA_CFLAGS) -o $@ $<
 ifeq ($(ENABLE_FULL_DEBUG_SYMBOLS),1)
   ifeq ($(OS_VENDOR), Darwin)
 	$(DSYMUTIL) $@

src/cpu/zero/vm/entry_zero.hpp

 /*
- * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2008, 2009, 2010 Red Hat, Inc.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -26,6 +26,8 @@
 #ifndef CPU_ZERO_VM_ENTRY_ZERO_HPP
 #define CPU_ZERO_VM_ENTRY_ZERO_HPP
 
+#include "interpreter/cppInterpreter.hpp"
+
 class ZeroEntry {
  public:
   ZeroEntry() {

src/cpu/zero/vm/nativeInst_zero.cpp

 /*
- * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2008 Red Hat, Inc.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -25,6 +25,8 @@
 
 #include "precompiled.hpp"
 #include "assembler_zero.inline.hpp"
+#include "entry_zero.hpp"
+#include "interpreter/cppInterpreter.hpp"
 #include "memory/resourceArea.hpp"
 #include "nativeInst_zero.hpp"
 #include "oops/oop.inline.hpp"

src/os/linux/vm/os_linux.hpp

@@ -284,8 +284,8 @@ private:
   static void set_numa_bitmask_isbitset(numa_bitmask_isbitset_func_t func) { _numa_bitmask_isbitset = func; }
   static void set_numa_distance(numa_distance_func_t func) { _numa_distance = func; }
   static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
-  static void set_numa_all_nodes_ptr(struct bitmask **ptr) { _numa_all_nodes_ptr = *ptr; }
-  static void set_numa_nodes_ptr(struct bitmask **ptr) { _numa_nodes_ptr = *ptr; }
+  static void set_numa_all_nodes_ptr(struct bitmask **ptr) { _numa_all_nodes_ptr = (ptr == NULL ? NULL : *ptr); }
+  static void set_numa_nodes_ptr(struct bitmask **ptr) { _numa_nodes_ptr = (ptr == NULL ? NULL : *ptr); }
   static int sched_getcpu_syscall(void);
 public:
   static int sched_getcpu()  { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
@@ -329,6 +329,18 @@ public:
   static bool isnode_in_existing_nodes(unsigned int n) {
     if (_numa_bitmask_isbitset != NULL && _numa_nodes_ptr != NULL) {
       return _numa_bitmask_isbitset(_numa_nodes_ptr, n);
+    } else if (_numa_bitmask_isbitset != NULL && _numa_all_nodes_ptr != NULL) {
+      // Not all libnuma API v2 implement numa_nodes_ptr, so it's not possible
+      // to trust the API version for checking its absence. On the other hand,
+      // numa_nodes_ptr found in libnuma 2.0.9 and above is the only way to get
+      // a complete view of all numa nodes in the system, hence numa_nodes_ptr
+      // is used to handle CPU and nodes on architectures (like PowerPC) where
+      // there can exist nodes with CPUs but no memory or vice-versa and the
+      // nodes may be non-contiguous. For most of the architectures, like
+      // x86_64, numa_node_ptr presents the same node set as found in
+      // numa_all_nodes_ptr so it's possible to use numa_all_nodes_ptr as a
+      // substitute.
+      return _numa_bitmask_isbitset(_numa_all_nodes_ptr, n);
     } else
       return 0;
   }

src/share/vm/c1/c1_Runtime1.cpp

 /*
- * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2018, 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
@@ -547,9 +547,8 @@ JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* t
     // normal bytecode execution.
     thread->clear_exception_oop_and_pc();
 
-    Handle original_exception(thread, exception());
-
-    continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false);
+    bool recursive_exception = false;
+    continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false, recursive_exception);
     // If an exception was thrown during exception dispatch, the exception oop may have changed
     thread->set_exception_oop(exception());
     thread->set_exception_pc(pc);
@@ -557,8 +556,9 @@ JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* t
     // the exception cache is used only by non-implicit exceptions
     // Update the exception cache only when there didn't happen
     // another exception during the computation of the compiled
-    // exception handler.
-    if (continuation != NULL && original_exception() == exception()) {
+    // exception handler. Checking for exception oop equality is not
+    // sufficient because some exceptions are pre-allocated and reused.
+    if (continuation != NULL && !recursive_exception) {
       nm->add_handler_for_exception_and_pc(exception, pc, continuation);
     }
   }

src/share/vm/code/codeBlob.cpp

 /*
- * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, 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
@@ -289,6 +289,28 @@ AdapterBlob* AdapterBlob::create(CodeBuffer* cb) {
   return blob;
 }
 
+VtableBlob::VtableBlob(const char* name, int size) :
+  BufferBlob(name, size) {
+}
+
+VtableBlob* VtableBlob::create(const char* name, int buffer_size) {
+  ThreadInVMfromUnknown __tiv;  // get to VM state in case we block on CodeCache_lock
+
+  VtableBlob* blob = NULL;
+  unsigned int size = sizeof(VtableBlob);
+  // align the size to CodeEntryAlignment
+  size = align_code_offset(size);
+  size += round_to(buffer_size, oopSize);
+  assert(name != NULL, "must provide a name");
+  {
+    MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
+    blob = new (size) VtableBlob(name, size);
+  }
+  // Track memory usage statistic after releasing CodeCache_lock
+  MemoryService::track_code_cache_memory_usage();
+
+  return blob;
+}
 
 //----------------------------------------------------------------------------------------------------
 // Implementation of MethodHandlesAdapterBlob

src/share/vm/code/codeBlob.hpp

 /*
- * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, 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
@@ -101,6 +101,7 @@ class CodeBlob VALUE_OBJ_CLASS_SPEC {
   virtual bool is_exception_stub() const         { return false; }
   virtual bool is_safepoint_stub() const              { return false; }
   virtual bool is_adapter_blob() const                { return false; }
+  virtual bool is_vtable_blob() const                 { return false; }
   virtual bool is_method_handles_adapter_blob() const { return false; }
 
   virtual bool is_compiled_by_c2() const         { return false; }
@@ -202,6 +203,7 @@ class CodeBlob VALUE_OBJ_CLASS_SPEC {
 class BufferBlob: public CodeBlob {
   friend class VMStructs;
   friend class AdapterBlob;
+  friend class VtableBlob;
   friend class MethodHandlesAdapterBlob;
 
  private:
@@ -246,6 +248,18 @@ public:
   virtual bool is_adapter_blob() const { return true; }
 };
 
+//---------------------------------------------------------------------------------------------------
+class VtableBlob: public BufferBlob {
+private:
+  VtableBlob(const char*, int);
+
+public:
+  // Creation
+  static VtableBlob* create(const char* name, int buffer_size);
+
+  // Typing
+  virtual bool is_vtable_blob() const { return true; }
+};
 
 //----------------------------------------------------------------------------------------------------
 // MethodHandlesAdapterBlob: used to hold MethodHandles adapters

src/share/vm/code/codeCache.cpp

 /*
- * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -41,6 +41,7 @@
 #include "oops/oop.inline.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/arguments.hpp"
+#include "runtime/deoptimization.hpp"
 #include "runtime/icache.hpp"
 #include "runtime/java.hpp"
 #include "runtime/mutexLocker.hpp"

src/share/vm/code/compiledIC.cpp

 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -232,7 +232,7 @@ bool CompiledIC::set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecod
     assert(k->verify_itable_index(itable_index), "sanity check");
 #endif //ASSERT
     CompiledICHolder* holder = new CompiledICHolder(call_info->resolved_method()->method_holder(),
-                                                    call_info->resolved_klass()());
+                                                    call_info->resolved_klass()(), false);
     holder->claim();
     InlineCacheBuffer::create_transition_stub(this, holder, entry);
   } else {
@@ -270,7 +270,7 @@ bool CompiledIC::is_megamorphic() const {
   assert(!is_optimized(), "an optimized call cannot be megamorphic");
 
   // Cannot rely on cached_value. It is either an interface or a method.
-  return VtableStubs::is_entry_point(ic_destination());
+  return VtableStubs::entry_point(ic_destination()) != NULL;
 }
 
 bool CompiledIC::is_call_to_compiled() const {
@@ -534,9 +534,11 @@ bool CompiledIC::is_icholder_entry(address entry) {
     return true;
   }
   // itable stubs also use CompiledICHolder
-  if (VtableStubs::is_entry_point(entry) && VtableStubs::stub_containing(entry)->is_itable_stub()) {
-    return true;
+  if (cb != NULL && cb->is_vtable_blob()) {
+    VtableStub* s = VtableStubs::entry_point(entry);
+    return (s != NULL) && s->is_itable_stub();
   }
+
   return false;
 }
 

src/share/vm/code/vtableStubs.cpp

 /*
- * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -60,7 +60,7 @@ void* VtableStub::operator new(size_t size, int code_size) throw() {
 
    // There is a dependency on the name of the blob in src/share/vm/prims/jvmtiCodeBlobEvents.cpp
    // If changing the name, update the other file accordingly.
-    BufferBlob* blob = BufferBlob::create("vtable chunks", bytes);
+    VtableBlob* blob = VtableBlob::create("vtable chunks", bytes);
     if (blob == NULL) {
       return NULL;
     }
@@ -167,17 +167,18 @@ void VtableStubs::enter(bool is_vtable_stub, int vtable_index, VtableStub* s) {
   _number_of_vtable_stubs++;
 }
 
-
-bool VtableStubs::is_entry_point(address pc) {
+VtableStub* VtableStubs::entry_point(address pc) {
   MutexLocker ml(VtableStubs_lock);
   VtableStub* stub = (VtableStub*)(pc - VtableStub::entry_offset());
   uint hash = VtableStubs::hash(stub->is_vtable_stub(), stub->index());
   VtableStub* s;
   for (s = _table[hash]; s != NULL && s != stub; s = s->next()) {}
-  return s == stub;
+  if (s == stub) {
+    return s;
+  }
+  return NULL;
 }
 
-
 bool VtableStubs::contains(address pc) {
   // simple solution for now - we may want to use
   // a faster way if this function is called often

src/share/vm/code/vtableStubs.hpp

 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -126,7 +126,7 @@ class VtableStubs : AllStatic {
  public:
   static address     find_vtable_stub(int vtable_index) { return find_stub(true,  vtable_index); }
   static address     find_itable_stub(int itable_index) { return find_stub(false, itable_index); }
-  static bool        is_entry_point(address pc);                     // is pc a vtable stub entry point?
+  static VtableStub* entry_point(address pc);                        // vtable stub entry point for a pc
   static bool        contains(address pc);                           // is pc within any stub?
   static VtableStub* stub_containing(address pc);                    // stub containing pc or NULL
   static int         number_of_vtable_stubs() { return _number_of_vtable_stubs; }

src/share/vm/interpreter/cppInterpreterGenerator.hpp

 /*
- * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -29,6 +29,9 @@
 // of the template interpreter generator.
 
 #ifdef CC_INTERP
+#ifdef TARGET_ARCH_zero
+# include "entry_zero.hpp"
+#endif
 
 class CppInterpreterGenerator: public AbstractInterpreterGenerator {
   protected:

src/share/vm/interpreter/interpreter.hpp

 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -28,11 +28,9 @@
 #include "code/stubs.hpp"
 #include "interpreter/cppInterpreter.hpp"
 #include "interpreter/templateInterpreter.hpp"
-#ifdef ZERO
 #ifdef TARGET_ARCH_zero
 # include "entry_zero.hpp"
 #endif
-#endif
 
 // This file contains the platform-independent parts
 // of the interpreter and the interpreter generator.

src/share/vm/interpreter/interpreterRuntime.cpp

 /*
- * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -320,6 +320,8 @@ IRT_ENTRY(void, InterpreterRuntime::throw_StackOverflowError(JavaThread* thread)
   Handle exception = get_preinitialized_exception(
                                  SystemDictionary::StackOverflowError_klass(),
                                  CHECK);
+  // Increment counter for hs_err file reporting
+  Atomic::inc(&Exceptions::_stack_overflow_errors);
   THROW_HANDLE(exception);
 IRT_END
 

src/share/vm/memory/metaspace.cpp

@@ -3098,13 +3098,24 @@ void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, a
   initialize_class_space(metaspace_rs);
 
   if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
-    gclog_or_tty->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: " SIZE_FORMAT,
-                            Universe::narrow_klass_base(), Universe::narrow_klass_shift());
-    gclog_or_tty->print_cr("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT " Req Addr: " PTR_FORMAT,
-                           compressed_class_space_size(), metaspace_rs.base(), requested_addr);
+      print_compressed_class_space(gclog_or_tty, requested_addr);
   }
 }
 
+void Metaspace::print_compressed_class_space(outputStream* st, const char* requested_addr) {
+  st->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: %d",
+               p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
+  if (_class_space_list != NULL) {
+    address base = (address)_class_space_list->current_virtual_space()->bottom();
+    st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT,
+                 compressed_class_space_size(), p2i(base));
+    if (requested_addr != 0) {
+      st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr));
+    }
+    st->cr();
+   }
+ }
+
 // For UseCompressedClassPointers the class space is reserved above the top of
 // the Java heap.  The argument passed in is at the base of the compressed space.
 void Metaspace::initialize_class_space(ReservedSpace rs) {

src/share/vm/memory/metaspace.hpp

 /*
- * Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2018, 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
@@ -259,6 +259,8 @@ class Metaspace : public CHeapObj<mtClass> {
   // Debugging support
   void verify();
 
+  static void print_compressed_class_space(outputStream* st, const char* requested_addr = 0);
+
   class AllocRecordClosure :  public StackObj {
   public:
     virtual void doit(address ptr, MetaspaceObj::Type type, int byte_size) = 0;

src/share/vm/memory/universe.cpp

 /*
- * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -882,7 +882,7 @@ jint Universe::initialize_heap() {
     Universe::set_narrow_ptrs_base(Universe::narrow_oop_base());
 
     if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) {
-      Universe::print_compressed_oops_mode();
+      Universe::print_compressed_oops_mode(tty);
     }
   }
   // Universe::narrow_oop_base() is one page below the heap.
@@ -904,23 +904,21 @@ jint Universe::initialize_heap() {
   return JNI_OK;
 }
 
-void Universe::print_compressed_oops_mode() {
-  tty->cr();
-  tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
+void Universe::print_compressed_oops_mode(outputStream* st) {
+  st->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB",
               Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M);
 
-  tty->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
+  st->print(", Compressed Oops mode: %s", narrow_oop_mode_to_string(narrow_oop_mode()));
 
   if (Universe::narrow_oop_base() != 0) {
-    tty->print(":" PTR_FORMAT, Universe::narrow_oop_base());
+    st->print(":" PTR_FORMAT, Universe::narrow_oop_base());
   }
 
   if (Universe::narrow_oop_shift() != 0) {
-    tty->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
+    st->print(", Oop shift amount: %d", Universe::narrow_oop_shift());
   }
 
-  tty->cr();
-  tty->cr();
+  st->cr();
 }
 
 // Reserve the Java heap, which is now the same for all GCs.

src/share/vm/memory/universe.hpp

 /*
- * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -375,7 +375,7 @@ class Universe: AllStatic {
   static void     set_narrow_ptrs_base(address a)         { _narrow_ptrs_base = a; }
   static address  narrow_ptrs_base()                      { return _narrow_ptrs_base; }
 
-  static void     print_compressed_oops_mode();
+  static void     print_compressed_oops_mode(outputStream* st);
 
   // this is set in vm_version on sparc (and then reset in universe afaict)
   static void     set_narrow_oop_shift(int shift)         {

src/share/vm/oops/compiledICHolder.cpp

 /*
- * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, 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
@@ -24,30 +24,12 @@
 
 #include "precompiled.hpp"
 #include "oops/compiledICHolder.hpp"
-#include "oops/klass.hpp"
-#include "oops/method.hpp"
 #include "oops/oop.inline2.hpp"
 
 volatile int CompiledICHolder::_live_count;
 volatile int CompiledICHolder::_live_not_claimed_count;
 
 
-bool CompiledICHolder::is_loader_alive(BoolObjectClosure* is_alive) {
-  if (_holder_metadata->is_method()) {
-    if (!((Method*)_holder_metadata)->method_holder()->is_loader_alive(is_alive)) {
-      return false;
-    }
-  } else if (_holder_metadata->is_klass()) {
-    if (!((Klass*)_holder_metadata)->is_loader_alive(is_alive)) {
-      return false;
-    }
-  }
-  if (!_holder_klass->is_loader_alive(is_alive)) {
-    return false;
-  }
-  return true;
-}
-
 // Printing
 
 void CompiledICHolder::print_on(outputStream* st) const {

src/share/vm/oops/compiledICHolder.hpp

 /*
- * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, 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 +26,8 @@
 #define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP
 
 #include "oops/oop.hpp"
+#include "oops/klass.hpp"
+#include "oops/method.hpp"
 
 // A CompiledICHolder* is a helper object for the inline cache implementation.
 // It holds:
@@ -48,11 +50,12 @@ class CompiledICHolder : public CHeapObj<mtCompiler> {
   Metadata* _holder_metadata;
   Klass*    _holder_klass;    // to avoid name conflict with oopDesc::_klass
   CompiledICHolder* _next;
+  bool _is_metadata_method;
 
  public:
   // Constructor
-  CompiledICHolder(Metadata* metadata, Klass* klass)
-      : _holder_metadata(metadata), _holder_klass(klass) {
+  CompiledICHolder(Metadata* metadata, Klass* klass, bool is_method = true)
+      : _holder_metadata(metadata), _holder_klass(klass), _is_metadata_method(is_method) {
 #ifdef ASSERT
     Atomic::inc(&_live_count);
     Atomic::inc(&_live_not_claimed_count);
@@ -82,7 +85,16 @@ class CompiledICHolder : public CHeapObj<mtCompiler> {
   CompiledICHolder* next()     { return _next; }
   void set_next(CompiledICHolder* n) { _next = n; }
 
-  bool is_loader_alive(BoolObjectClosure* is_alive);
+  inline bool is_loader_alive(BoolObjectClosure* is_alive) {
+    Klass* k = _is_metadata_method ? ((Method*)_holder_metadata)->method_holder() : (Klass*)_holder_metadata;
+    if (!k->is_loader_alive(is_alive)) {
+      return false;
+    }
+    if (!_holder_klass->is_loader_alive(is_alive)) {
+      return false;
+    }
+    return true;
+  }
 
   // Verify
   void verify_on(outputStream* st);

src/share/vm/opto/ifnode.cpp

@@ -453,6 +453,9 @@ static Node* split_if(IfNode *iff, PhaseIterGVN *igvn) {
 // offset.  Return 2 if we had to negate the test.  Index is NULL if the check
 // is versus a constant.
 int IfNode::is_range_check(Node* &range, Node* &index, jint &offset) {
+  if (outcnt() != 2) {
+    return 0;
+  }
   Node* b = in(1);
   if (b == NULL || !b->is_Bool())  return 0;
   BoolNode* bn = b->as_Bool();

src/share/vm/opto/library_call.cpp

@@ -6026,7 +6026,7 @@ bool LibraryCallKit::inline_montgomeryMultiply() {
   }
 
   assert(UseMontgomeryMultiplyIntrinsic, "not implemented on this platform");
-  const char* stubName = "montgomery_square";
+  const char* stubName = "montgomery_multiply";
 
   assert(callee()->signature()->size() == 7, "montgomeryMultiply has 7 parameters");
 

src/share/vm/opto/runtime.cpp

 /*
- * Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, 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
@@ -1234,17 +1234,23 @@ JRT_ENTRY_NO_ASYNC(address, OptoRuntime::handle_exception_C_helper(JavaThread* t
         force_unwind ? NULL : nm->handler_for_exception_and_pc(exception, pc);
 
       if (handler_address == NULL) {
-        Handle original_exception(thread, exception());
-        handler_address = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, force_unwind, true);
+        bool recursive_exception = false;
+        handler_address = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, force_unwind, true, recursive_exception);
         assert (handler_address != NULL, "must have compiled handler");
         // Update the exception cache only when the unwind was not forced
         // and there didn't happen another exception during the computation of the
-        // compiled exception handler.
-        if (!force_unwind && original_exception() == exception()) {
+        // compiled exception handler. Checking for exception oop equality is not
+        // sufficient because some exceptions are pre-allocated and reused.
+        if (!force_unwind && !recursive_exception) {
           nm->add_handler_for_exception_and_pc(exception,pc,handler_address);
         }
       } else {
-        assert(handler_address == SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, force_unwind, true), "Must be the same");
+#ifdef ASSERT
+        bool recursive_exception = false;
+        address computed_address = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, force_unwind, true, recursive_exception);
+        assert(recursive_exception || (handler_address == computed_address), err_msg("Handler address inconsistency: " PTR_FORMAT " != " PTR_FORMAT,
+                 p2i(handler_address), p2i(computed_address)));
+#endif
       }
     }
 

src/share/vm/prims/jvmtiTagMap.cpp

 /*
- * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2018, 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
@@ -47,6 +47,7 @@
 #include "services/serviceUtil.hpp"
 #include "utilities/macros.hpp"
 #if INCLUDE_ALL_GCS
+#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
 #endif // INCLUDE_ALL_GCS
 
@@ -1519,6 +1520,14 @@ class TagObjectCollector : public JvmtiTagHashmapEntryClosure {
       if (_tags[i] == entry->tag()) {
         oop o = entry->object();
         assert(o != NULL && Universe::heap()->is_in_reserved(o), "sanity check");
+#if INCLUDE_ALL_GCS
+        if (UseG1GC) {
+          // The reference in this tag map could be the only (implicitly weak)
+          // reference to that object. If we hand it out, we need to keep it live wrt
+          // SATB marking similar to other j.l.ref.Reference referents.
+          G1SATBCardTableModRefBS::enqueue(o);
+        }
+#endif
         jobject ref = JNIHandles::make_local(JavaThread::current(), o);
         _object_results->append(ref);
         _tag_results->append((uint64_t)entry->tag());

src/share/vm/runtime/frame.hpp

 /*
- * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -45,11 +45,9 @@
 # include "adfiles/adGlobals_ppc_64.hpp"
 #endif
 #endif // COMPILER2
-#ifdef ZERO
 #ifdef TARGET_ARCH_zero
 # include "stack_zero.hpp"
 #endif
-#endif
 
 typedef class BytecodeInterpreter* interpreterState;
 

src/share/vm/runtime/frame.inline.hpp

 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -46,14 +46,12 @@
 #ifdef TARGET_ARCH_ppc
 # include "jniTypes_ppc.hpp"
 #endif
-#ifdef ZERO
 #ifdef TARGET_ARCH_zero
 # include "entryFrame_zero.hpp"
 # include "fakeStubFrame_zero.hpp"
 # include "interpreterFrame_zero.hpp"
 # include "sharkFrame_zero.hpp"
 #endif
-#endif
 
 // This file holds platform-independent bodies of inline functions for frames.
 

src/share/vm/runtime/os.cpp

 /*
- * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -847,7 +847,7 @@ void os::print_cpu_info(outputStream* st) {
   pd_print_cpu_info(st);
 }
 
-void os::print_date_and_time(outputStream *st) {
+void os::print_date_and_time(outputStream *st, char* buf, size_t buflen) {
   const int secs_per_day  = 86400;
   const int secs_per_hour = 3600;
   const int secs_per_min  = 60;
@@ -856,6 +856,12 @@ void os::print_date_and_time(outputStream *st) {
   (void)time(&tloc);
   st->print("time: %s", ctime(&tloc));  // ctime adds newline.
 
+  struct tm tz;
+  if (localtime_pd(&tloc, &tz) != NULL) {
+    ::strftime(buf, buflen, "%Z", &tz);
+    st->print_cr("timezone: %s", buf);
+  }
+
   double t = os::elapsedTime();
   // NOTE: It tends to crash after a SEGV if we want to printf("%f",...) in
   //       Linux. Must be a bug in glibc ? Workaround is to round "t" to int

src/share/vm/runtime/os.hpp

@@ -621,7 +621,7 @@ class os: AllStatic {
   static void print_register_info(outputStream* st, void* context);
   static void print_siginfo(outputStream* st, void* siginfo);
   static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
-  static void print_date_and_time(outputStream* st);
+  static void print_date_and_time(outputStream* st, char* buf, size_t buflen);
 
   static void print_location(outputStream* st, intptr_t x, bool verbose = false);
   static size_t lasterror(char *buf, size_t len);

src/share/vm/runtime/sharedRuntime.cpp

 /*
- * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -639,7 +639,7 @@ JRT_END
 // ret_pc points into caller; we are returning caller's exception handler
 // for given exception
 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
-                                                    bool force_unwind, bool top_frame_only) {
+                                                    bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
   assert(nm != NULL, "must exist");
   ResourceMark rm;
 
@@ -667,6 +667,7 @@ address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc,
         // BCI of the exception handler which caused the exception to be
         // thrown (bugs 4307310 and 4546590). Set "exception" reference
         // argument to ensure that the correct exception is thrown (4870175).
+        recursive_exception_occurred = true;
         exception = Handle(THREAD, PENDING_EXCEPTION);
         CLEAR_PENDING_EXCEPTION;
         if (handler_bci >= 0) {
@@ -758,6 +759,8 @@ JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* thread))
   if (StackTraceInThrowable) {
     java_lang_Throwable::fill_in_stack_trace(exception);
   }
+  // Increment counter for hs_err file reporting
+  Atomic::inc(&Exceptions::_stack_overflow_errors);
   throw_and_post_jvmti_exception(thread, exception);
 JRT_END
 

src/share/vm/runtime/sharedRuntime.hpp

 /*
- * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2018, 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
@@ -184,7 +184,7 @@ class SharedRuntime: AllStatic {
 
   // exception handling and implicit exceptions
   static address compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
-                                              bool force_unwind, bool top_frame_only);
+                                              bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred);
   enum ImplicitExceptionKind {
     IMPLICIT_NULL,
     IMPLICIT_DIVIDE_BY_ZERO,

src/share/vm/runtime/thread.hpp

@@ -51,11 +51,9 @@
 #include "gc_implementation/g1/dirtyCardQueue.hpp"
 #include "gc_implementation/g1/satbQueue.hpp"
 #endif // INCLUDE_ALL_GCS
-#ifdef ZERO
 #ifdef TARGET_ARCH_zero
 # include "stack_zero.hpp"
 #endif
-#endif
 
 class ThreadSafepointState;
 class ThreadProfiler;

src/share/vm/utilities/exceptions.cpp

 /*
- * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, 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
@@ -154,6 +154,10 @@ void Exceptions::_throw(Thread* thread, const char* file, int line, Handle h_exc
     return;
   }
 
+  if (h_exception->is_a(SystemDictionary::OutOfMemoryError_klass())) {
+    count_out_of_memory_exceptions(h_exception);
+  }
+
   assert(h_exception->is_a(SystemDictionary::Throwable_klass()), "exception is not a subclass of java/lang/Throwable");
 
   // set the pending exception
@@ -228,6 +232,8 @@ void Exceptions::throw_stack_overflow_exception(Thread* THREAD, const char* file
     if (StackTraceInThrowable) {
       java_lang_Throwable::fill_in_stack_trace(exception, method());
     }
+    // Increment counter for hs_err file reporting
+    Atomic::inc(&Exceptions::_stack_overflow_errors);
   } else {
     // if prior exception, throw that one instead
     exception = Handle(THREAD, THREAD->pending_exception());
@@ -404,6 +410,44 @@ Handle Exceptions::new_exception(Thread* thread, Symbol* name,
                                    h_prot, to_utf8_safe);
 }
 
+
+// Exception counting for hs_err file
+volatile int Exceptions::_stack_overflow_errors = 0;
+volatile int Exceptions::_out_of_memory_error_java_heap_errors = 0;
+volatile int Exceptions::_out_of_memory_error_metaspace_errors = 0;
+volatile int Exceptions::_out_of_memory_error_class_metaspace_errors = 0;
+
+void Exceptions::count_out_of_memory_exceptions(Handle exception) {
+  if (exception() == Universe::out_of_memory_error_metaspace()) {
+     Atomic::inc(&_out_of_memory_error_metaspace_errors);
+  } else if (exception() == Universe::out_of_memory_error_class_metaspace()) {
+     Atomic::inc(&_out_of_memory_error_class_metaspace_errors);
+  } else {
+     // everything else reported as java heap OOM
+     Atomic::inc(&_out_of_memory_error_java_heap_errors);
+  }
+}
+
+void print_oom_count(outputStream* st, const char *err, int count) {
+  if (count > 0) {
+    st->print_cr("OutOfMemoryError %s=%d", err, count);
+  }
+}
+
+bool Exceptions::has_exception_counts() {
+  return (_stack_overflow_errors + _out_of_memory_error_java_heap_errors +
+         _out_of_memory_error_metaspace_errors + _out_of_memory_error_class_metaspace_errors) > 0;
+}
+
+void Exceptions::print_exception_counts_on_error(outputStream* st) {
+  print_oom_count(st, "java_heap_errors", _out_of_memory_error_java_heap_errors);
+  print_oom_count(st, "metaspace_errors", _out_of_memory_error_metaspace_errors);
+  print_oom_count(st, "class_metaspace_errors", _out_of_memory_error_class_metaspace_errors);
+  if (_stack_overflow_errors > 0) {
+    st->print_cr("StackOverflowErrors=%d", _stack_overflow_errors);
+  }
+}
+
 // Implementation of ExceptionMark
 
 ExceptionMark::ExceptionMark(Thread*& thread) {

src/share/vm/utilities/exceptions.hpp

 /*
- * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2018, 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
@@ -102,6 +102,11 @@ class ThreadShadow: public CHeapObj<mtThread> {
 class Exceptions {
   static bool special_exception(Thread *thread, const char* file, int line, Handle exception);
   static bool special_exception(Thread* thread, const char* file, int line, Symbol* name, const char* message);
+
+  // Count out of memory errors that are interesting in error diagnosis
+  static volatile int _out_of_memory_error_java_heap_errors;
+  static volatile int _out_of_memory_error_metaspace_errors;
+  static volatile int _out_of_memory_error_class_metaspace_errors;
  public:
   // this enum is defined to indicate whether it is safe to
   // ignore the encoding scheme of the original message string.
@@ -160,6 +165,14 @@ class Exceptions {
 
   static void throw_stack_overflow_exception(Thread* thread, const char* file, int line, methodHandle method);
 
+  // Exception counting for error files of interesting exceptions that may have
+  // caused a problem for the jvm
+  static volatile int _stack_overflow_errors;
+
+  static bool has_exception_counts();
+  static void count_out_of_memory_exceptions(Handle exception);
+  static void print_exception_counts_on_error(outputStream* st);
+
   // for AbortVMOnException flag
   NOT_PRODUCT(static void debug_check_abort(Handle exception, const char* message = NULL);)
   NOT_PRODUCT(static void debug_check_abort(const char *value_string, const char* message = NULL);)

src/share/vm/utilities/vmError.cpp

 /*
- * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2018, 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
@@ -304,6 +304,47 @@ void VMError::print_stack_trace(outputStream* st, JavaThread* jt,
 #endif // ZERO
 }
 
+static void print_oom_reasons(outputStream* st) {
+  st->print_cr("# Possible reasons:");
+  st->print_cr("#   The system is out of physical RAM or swap space");
+  if (UseCompressedOops) {
+    st->print_cr("#   The process is running with CompressedOops enabled, and the Java Heap may be blocking the growth of the native heap");
+  }
+  if (LogBytesPerWord == 2) {
+    st->print_cr("#   In 32 bit mode, the process size limit was hit");
+  }
+  st->print_cr("# Possible solutions:");
+  st->print_cr("#   Reduce memory load on the system");
+  st->print_cr("#   Increase physical memory or swap space");
+  st->print_cr("#   Check if swap backing store is full");
+  if (LogBytesPerWord == 2) {
+    st->print_cr("#   Use 64 bit Java on a 64 bit OS");
+  }
+  st->print_cr("#   Decrease Java heap size (-Xmx/-Xms)");
+  st->print_cr("#   Decrease number of Java threads");
+  st->print_cr("#   Decrease Java thread stack sizes (-Xss)");
+  st->print_cr("#   Set larger code cache with -XX:ReservedCodeCacheSize=");
+  if (UseCompressedOops) {
+    switch (Universe::narrow_oop_mode()) {
+      case Universe::UnscaledNarrowOop:
+        st->print_cr("#   JVM is running with Unscaled Compressed Oops mode in which the Java heap is");
+        st->print_cr("#     placed in the first 4GB address space. The Java Heap base address is the");
+        st->print_cr("#     maximum limit for the native heap growth. Please use -XX:HeapBaseMinAddress");
+        st->print_cr("#     to set the Java Heap base and to place the Java Heap above 4GB virtual address.");
+        break;
+      case Universe::ZeroBasedNarrowOop:
+        st->print_cr("#   JVM is running with Zero Based Compressed Oops mode in which the Java heap is");
+        st->print_cr("#     placed in the first 32GB address space. The Java Heap base address is the");
+        st->print_cr("#     maximum limit for the native heap growth. Please use -XX:HeapBaseMinAddress");
+        st->print_cr("#     to set the Java Heap base and to place the Java Heap above 32GB virtual address.");
+        break;
+      default:
+        break;
+    }
+  }
+  st->print_cr("# This output file may be truncated or incomplete.");
+}
+
 // This is the main function to report a fatal error. Only one thread can
 // call this function, so we don't need to worry about MT-safety. But it's
 // possible that the error handler itself may crash or die on an internal
@@ -375,19 +416,7 @@ void VMError::report(outputStream* st) {
          }
          // In error file give some solutions
          if (_verbose) {
-           st->print_cr("# Possible reasons:");
-           st->print_cr("#   The system is out of physical RAM or swap space");
-           st->print_cr("#   In 32 bit mode, the process size limit was hit");
-           st->print_cr("# Possible solutions:");
-           st->print_cr("#   Reduce memory load on the system");
-           st->print_cr("#   Increase physical memory or swap space");
-           st->print_cr("#   Check if swap backing store is full");
-           st->print_cr("#   Use 64 bit Java on a 64 bit OS");
-           st->print_cr("#   Decrease Java heap size (-Xmx/-Xms)");
-           st->print_cr("#   Decrease number of Java threads");
-           st->print_cr("#   Decrease Java thread stack sizes (-Xss)");
-           st->print_cr("#   Set larger code cache with -XX:ReservedCodeCacheSize=");
-           st->print_cr("# This output file may be truncated or incomplete.");
+           print_oom_reasons(st);
          } else {
            return;  // that's enough for the screen
          }
@@ -675,6 +704,24 @@ void VMError::report(outputStream* st) {
        st->cr();
      }
 
+  STEP(182, "(printing number of OutOfMemoryError and StackOverflow exceptions)")
+
+     if (_verbose && Exceptions::has_exception_counts()) {
+       st->print_cr("OutOfMemory and StackOverflow Exception counts:");
+       Exceptions::print_exception_counts_on_error(st);
+       st->cr();
+     }
+
+  STEP(185, "(printing compressed oops mode")
+
+     if (_verbose && UseCompressedOops) {
+       Universe::print_compressed_oops_mode(st);
+       if (UseCompressedClassPointers) {
+         Metaspace::print_compressed_class_space(st);
+       }
+       st->cr();
+     }
+
   STEP(190, "(printing heap information)" )
 
      if (_verbose && Universe::is_fully_initialized()) {
@@ -780,7 +827,7 @@ void VMError::report(outputStream* st) {
   STEP(280, "(printing date and time)" )
 
      if (_verbose) {
-       os::print_date_and_time(st);
+       os::print_date_and_time(st, buf, sizeof(buf));
        st->cr();
      }
 

test/compiler/gcbarriers/PreserveFPRegistersTest.java

@@ -25,14 +25,22 @@
 /**
  * @test
  * @bug 8148175
- * @run main/othervm/timeout=300  -XX:+UseG1GC -Xbatch -Xmx128m PreserveFPRegistersTest
+ * @requires vm.gc=="G1" | vm.gc=="null"
+ * @library /testlibrary /testlibrary/whitebox
+ * @run main/bootclasspath/othervm -Xbatch -XX:+UnlockDiagnosticVMOptions
+ *      -XX:+WhiteBoxAPI -Xmx300m -XX:+UseG1GC PreserveFPRegistersTest
  */
+
+import sun.hotspot.WhiteBox;
+
 public class PreserveFPRegistersTest {
 
     public static void main(String... args) throws InterruptedException {
         new PreserveFPRegistersTest().go();
     }
 
+    private static WhiteBox wb = WhiteBox.getWhiteBox();
+
     public final Object[][] storage;
 
     /**
@@ -51,19 +59,33 @@ public class PreserveFPRegistersTest {
     public final int regionCount;
 
     PreserveFPRegistersTest() {
-        long regionSize = 1_000_000; //WB.g1RegionSize();
-
+        long regionSize = wb.g1RegionSize();
         Runtime rt = Runtime.getRuntime();
         long used = rt.totalMemory() - rt.freeMemory();
         long totalFree = rt.maxMemory() - used;
         regionCount = (int) ( (totalFree / regionSize) * 0.9);
-        int refSize = 4;
-
+        int refSize = wb.getHeapOopSize();
         N = (int) ((regionSize / K ) / refSize) - 5;
+
+        System.out.println("%% Memory");
+        System.out.println("%%   used          :        " + used / 1024 + "M");
+        System.out.println("%%   available     :        " + totalFree / 1024 + "M");
+        System.out.println("%%   G1 Region Size:        " + regionSize / 1024 + "M");
+        System.out.println("%%   region count  :        " + regionCount);
+
+        System.out.println("%% Objects storage");
+        System.out.println("%%   N (array length)      : " + N);
+        System.out.println("%%   K (objects in regions): " + K);
+        System.out.println("%%   Reference size        : " + refSize);
+
+        try {
             storage = new Object[regionCount * K][];
             for (int i = 0; i < storage.length; i++) {
                 storage[i] = new Object[N];
             }
+        } catch(OutOfMemoryError e) {
+            throw new AssertionError("Test Failed with unexpected OutOfMemoryError exception");
+        }
     }
 
     public void go() throws InterruptedException {