# HG changeset patch
# User amurillo
# Date 1401480693 25200
# Node ID ee8b934668694dba5dc0ac039f8d56e52499c0f9
# Parent  460b0b08247ffcf4c76843216af6be03c2226544# Parent  0342d80559e048c6292c2726d712e0d97344603b
Merge

diff -r 460b0b08247f -r ee8b93466869 make/hotspot_version
--- a/make/hotspot_version	Wed May 28 02:27:39 2014 -0700
+++ b/make/hotspot_version	Fri May 30 13:11:33 2014 -0700
@@ -35,7 +35,7 @@
 
 HS_MAJOR_VER=25
 HS_MINOR_VER=20
-HS_BUILD_NUMBER=16
+HS_BUILD_NUMBER=17
 
 JDK_MAJOR_VER=1
 JDK_MINOR_VER=8
diff -r 460b0b08247f -r ee8b93466869 src/cpu/sparc/vm/c1_LIRGenerator_sparc.cpp
--- a/src/cpu/sparc/vm/c1_LIRGenerator_sparc.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/cpu/sparc/vm/c1_LIRGenerator_sparc.cpp	Fri May 30 13:11:33 2014 -0700
@@ -1221,10 +1221,8 @@
   bool is_obj = (type == T_ARRAY || type == T_OBJECT);
   LIR_Opr offset = off.result();
 
-  if (data != dst) {
-    __ move(data, dst);
-    data = dst;
-  }
+  // Because we want a 2-arg form of xchg
+  __ move(data, dst);
 
   assert (!x->is_add() && (type == T_INT || (is_obj LP64_ONLY(&& UseCompressedOops))), "unexpected type");
   LIR_Address* addr;
@@ -1254,7 +1252,7 @@
     pre_barrier(ptr, LIR_OprFact::illegalOpr /* pre_val */,
                 true /* do_load */, false /* patch */, NULL);
   }
-  __ xchg(LIR_OprFact::address(addr), data, dst, tmp);
+  __ xchg(LIR_OprFact::address(addr), dst, dst, tmp);
   if (is_obj) {
     // Seems to be a precise address
     post_barrier(ptr, data);
diff -r 460b0b08247f -r ee8b93466869 src/cpu/sparc/vm/stubGenerator_sparc.cpp
--- a/src/cpu/sparc/vm/stubGenerator_sparc.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/cpu/sparc/vm/stubGenerator_sparc.cpp	Fri May 30 13:11:33 2014 -0700
@@ -3653,9 +3653,9 @@
     const Register len_reg = I4; // cipher length
     const Register keylen = I5;  // reg for storing expanded key array length
 
-    // save cipher len before save_frame, to return in the end
-    __ mov(O4, L0);
     __ save_frame(0);
+    // save cipher len to return in the end
+    __ mov(len_reg, L0);
 
     // read expanded key length
     __ ldsw(Address(key, arrayOopDesc::length_offset_in_bytes() - arrayOopDesc::base_offset_in_bytes(T_INT)), keylen, 0);
@@ -3778,9 +3778,9 @@
     // re-init intial vector for next block, 8-byte alignment is guaranteed
     __ stf(FloatRegisterImpl::D, F60, rvec, 0);
     __ stf(FloatRegisterImpl::D, F62, rvec, 8);
-    __ restore();
-    __ retl();
-    __ delayed()->mov(L0, O0);
+    __ mov(L0, I0);
+    __ ret();
+    __ delayed()->restore();
 
     __ align(OptoLoopAlignment);
     __ BIND(L_cbcenc192);
@@ -3869,9 +3869,9 @@
     // re-init intial vector for next block, 8-byte alignment is guaranteed
     __ stf(FloatRegisterImpl::D, F60, rvec, 0);
     __ stf(FloatRegisterImpl::D, F62, rvec, 8);
-    __ restore();
-    __ retl();
-    __ delayed()->mov(L0, O0);
+    __ mov(L0, I0);
+    __ ret();
+    __ delayed()->restore();
 
     __ align(OptoLoopAlignment);
     __ BIND(L_cbcenc256);
@@ -3962,9 +3962,9 @@
     // re-init intial vector for next block, 8-byte alignment is guaranteed
     __ stf(FloatRegisterImpl::D, F60, rvec, 0);
     __ stf(FloatRegisterImpl::D, F62, rvec, 8);
-    __ restore();
-    __ retl();
-    __ delayed()->mov(L0, O0);
+    __ mov(L0, I0);
+    __ ret();
+    __ delayed()->restore();
 
     return start;
   }
@@ -3992,9 +3992,9 @@
     const Register original_key = I5;  // original key array only required during decryption
     const Register keylen = L6;  // reg for storing expanded key array length
 
-    // save cipher len before save_frame, to return in the end
-    __ mov(O4, L0);
     __ save_frame(0); //args are read from I* registers since we save the frame in the beginning
+    // save cipher len to return in the end
+    __ mov(len_reg, L7);
 
     // load original key from SunJCE expanded decryption key
     // Since we load original key buffer starting first element, 8-byte alignment is guaranteed
@@ -4568,10 +4568,9 @@
     // re-init intial vector for next block, 8-byte alignment is guaranteed
     __ stx(L0, rvec, 0);
     __ stx(L1, rvec, 8);
-    __ restore();
-    __ mov(L0, O0);
-    __ retl();
-    __ delayed()->nop();
+    __ mov(L7, I0);
+    __ ret();
+    __ delayed()->restore();
 
     return start;
   }
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/c1/c1_LIR.cpp
--- a/src/share/vm/c1/c1_LIR.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/c1/c1_LIR.cpp	Fri May 30 13:11:33 2014 -0700
@@ -1083,7 +1083,7 @@
 
 void LIR_OpArrayCopy::emit_code(LIR_Assembler* masm) {
   masm->emit_arraycopy(this);
-  masm->emit_code_stub(stub());
+  masm->append_code_stub(stub());
 }
 
 void LIR_OpUpdateCRC32::emit_code(LIR_Assembler* masm) {
@@ -1100,20 +1100,20 @@
 
 void LIR_OpAllocObj::emit_code(LIR_Assembler* masm) {
   masm->emit_alloc_obj(this);
-  masm->emit_code_stub(stub());
+  masm->append_code_stub(stub());
 }
 
 void LIR_OpBranch::emit_code(LIR_Assembler* masm) {
   masm->emit_opBranch(this);
   if (stub()) {
-    masm->emit_code_stub(stub());
+    masm->append_code_stub(stub());
   }
 }
 
 void LIR_OpConvert::emit_code(LIR_Assembler* masm) {
   masm->emit_opConvert(this);
   if (stub() != NULL) {
-    masm->emit_code_stub(stub());
+    masm->append_code_stub(stub());
   }
 }
 
@@ -1123,13 +1123,13 @@
 
 void LIR_OpAllocArray::emit_code(LIR_Assembler* masm) {
   masm->emit_alloc_array(this);
-  masm->emit_code_stub(stub());
+  masm->append_code_stub(stub());
 }
 
 void LIR_OpTypeCheck::emit_code(LIR_Assembler* masm) {
   masm->emit_opTypeCheck(this);
   if (stub()) {
-    masm->emit_code_stub(stub());
+    masm->append_code_stub(stub());
   }
 }
 
@@ -1144,7 +1144,7 @@
 void LIR_OpLock::emit_code(LIR_Assembler* masm) {
   masm->emit_lock(this);
   if (stub()) {
-    masm->emit_code_stub(stub());
+    masm->append_code_stub(stub());
   }
 }
 
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/c1/c1_LIR.hpp
--- a/src/share/vm/c1/c1_LIR.hpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/c1/c1_LIR.hpp	Fri May 30 13:11:33 2014 -0700
@@ -1127,6 +1127,7 @@
   virtual void print_instr(outputStream* out) const   = 0;
   virtual void print_on(outputStream* st) const PRODUCT_RETURN;
 
+  virtual bool is_patching() { return false; }
   virtual LIR_OpCall* as_OpCall() { return NULL; }
   virtual LIR_OpJavaCall* as_OpJavaCall() { return NULL; }
   virtual LIR_OpLabel* as_OpLabel() { return NULL; }
@@ -1387,6 +1388,7 @@
     return (LIR_MoveKind)_flags;
   }
 
+  virtual bool is_patching() { return _patch != lir_patch_none; }
   virtual void emit_code(LIR_Assembler* masm);
   virtual LIR_Op1* as_Op1() { return this; }
   virtual const char * name() const PRODUCT_RETURN0;
@@ -1619,6 +1621,7 @@
   int       profiled_bci() const                 { return _profiled_bci;      }
   bool      should_profile() const               { return _should_profile;    }
 
+  virtual bool is_patching() { return _info_for_patch != NULL; }
   virtual void emit_code(LIR_Assembler* masm);
   virtual LIR_OpTypeCheck* as_OpTypeCheck() { return this; }
   void print_instr(outputStream* out) const PRODUCT_RETURN;
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/c1/c1_LIRAssembler.cpp
--- a/src/share/vm/c1/c1_LIRAssembler.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/c1/c1_LIRAssembler.cpp	Fri May 30 13:11:33 2014 -0700
@@ -58,7 +58,7 @@
     _masm->nop();
   }
   patch->install(_masm, patch_code, obj, info);
-  append_patching_stub(patch);
+  append_code_stub(patch);
 
 #ifdef ASSERT
   Bytecodes::Code code = info->scope()->method()->java_code_at_bci(info->stack()->bci());
@@ -131,11 +131,6 @@
 }
 
 
-void LIR_Assembler::append_patching_stub(PatchingStub* stub) {
-  _slow_case_stubs->append(stub);
-}
-
-
 void LIR_Assembler::check_codespace() {
   CodeSection* cs = _masm->code_section();
   if (cs->remaining() < (int)(NOT_LP64(1*K)LP64_ONLY(2*K))) {
@@ -144,7 +139,7 @@
 }
 
 
-void LIR_Assembler::emit_code_stub(CodeStub* stub) {
+void LIR_Assembler::append_code_stub(CodeStub* stub) {
   _slow_case_stubs->append(stub);
 }
 
@@ -435,7 +430,7 @@
 
 void LIR_Assembler::add_debug_info_for_null_check(int pc_offset, CodeEmitInfo* cinfo) {
   ImplicitNullCheckStub* stub = new ImplicitNullCheckStub(pc_offset, cinfo);
-  emit_code_stub(stub);
+  append_code_stub(stub);
 }
 
 void LIR_Assembler::add_debug_info_for_div0_here(CodeEmitInfo* info) {
@@ -444,7 +439,7 @@
 
 void LIR_Assembler::add_debug_info_for_div0(int pc_offset, CodeEmitInfo* cinfo) {
   DivByZeroStub* stub = new DivByZeroStub(pc_offset, cinfo);
-  emit_code_stub(stub);
+  append_code_stub(stub);
 }
 
 void LIR_Assembler::emit_rtcall(LIR_OpRTCall* op) {
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/c1/c1_LIRAssembler.hpp
--- a/src/share/vm/c1/c1_LIRAssembler.hpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/c1/c1_LIRAssembler.hpp	Fri May 30 13:11:33 2014 -0700
@@ -143,7 +143,7 @@
   // stubs
   void emit_slow_case_stubs();
   void emit_static_call_stub();
-  void emit_code_stub(CodeStub* op);
+  void append_code_stub(CodeStub* op);
   void add_call_info_here(CodeEmitInfo* info)                              { add_call_info(code_offset(), info); }
 
   // code patterns
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/c1/c1_LinearScan.cpp
--- a/src/share/vm/c1/c1_LinearScan.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/c1/c1_LinearScan.cpp	Fri May 30 13:11:33 2014 -0700
@@ -2382,16 +2382,6 @@
   int arg_count = frame_map()->oop_map_arg_count();
   OopMap* map = new OopMap(frame_size, arg_count);
 
-  // Check if this is a patch site.
-  bool is_patch_info = false;
-  if (op->code() == lir_move) {
-    assert(!is_call_site, "move must not be a call site");
-    assert(op->as_Op1() != NULL, "move must be LIR_Op1");
-    LIR_Op1* move = (LIR_Op1*)op;
-
-    is_patch_info = move->patch_code() != lir_patch_none;
-  }
-
   // Iterate through active intervals
   for (Interval* interval = iw->active_first(fixedKind); interval != Interval::end(); interval = interval->next()) {
     int assigned_reg = interval->assigned_reg();
@@ -2406,7 +2396,7 @@
     // moves, any intervals which end at this instruction are included
     // in the oop map since we may safepoint while doing the patch
     // before we've consumed the inputs.
-    if (is_patch_info || op->id() < interval->current_to()) {
+    if (op->is_patching() || op->id() < interval->current_to()) {
 
       // caller-save registers must not be included into oop-maps at calls
       assert(!is_call_site || assigned_reg >= nof_regs || !is_caller_save(assigned_reg), "interval is in a caller-save register at a call -> register will be overwritten");
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/concurrentMark.cpp
--- a/src/share/vm/gc_implementation/g1/concurrentMark.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/concurrentMark.cpp	Fri May 30 13:11:33 2014 -0700
@@ -819,7 +819,7 @@
     // false before we start remark. At this point we should also be
     // in a STW phase.
     assert(!concurrent_marking_in_progress(), "invariant");
-    assert(_finger == _heap_end,
+    assert(out_of_regions(),
            err_msg("only way to get here: _finger: "PTR_FORMAT", _heap_end: "PTR_FORMAT,
                    p2i(_finger), p2i(_heap_end)));
     update_g1_committed(true);
@@ -978,7 +978,9 @@
   if (concurrent()) {
     ConcurrentGCThread::stsLeave();
   }
-  _first_overflow_barrier_sync.enter();
+
+  bool barrier_aborted = !_first_overflow_barrier_sync.enter();
+
   if (concurrent()) {
     ConcurrentGCThread::stsJoin();
   }
@@ -986,7 +988,17 @@
   // more work
 
   if (verbose_low()) {
-    gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id);
+    if (barrier_aborted) {
+      gclog_or_tty->print_cr("[%u] aborted first barrier", worker_id);
+    } else {
+      gclog_or_tty->print_cr("[%u] leaving first barrier", worker_id);
+    }
+  }
+
+  if (barrier_aborted) {
+    // If the barrier aborted we ignore the overflow condition and
+    // just abort the whole marking phase as quickly as possible.
+    return;
   }
 
   // If we're executing the concurrent phase of marking, reset the marking
@@ -1026,14 +1038,20 @@
   if (concurrent()) {
     ConcurrentGCThread::stsLeave();
   }
-  _second_overflow_barrier_sync.enter();
+
+  bool barrier_aborted = !_second_overflow_barrier_sync.enter();
+
   if (concurrent()) {
     ConcurrentGCThread::stsJoin();
   }
   // at this point everything should be re-initialized and ready to go
 
   if (verbose_low()) {
-    gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id);
+    if (barrier_aborted) {
+      gclog_or_tty->print_cr("[%u] aborted second barrier", worker_id);
+    } else {
+      gclog_or_tty->print_cr("[%u] leaving second barrier", worker_id);
+    }
   }
 }
 
@@ -3232,6 +3250,8 @@
   for (uint i = 0; i < _max_worker_id; ++i) {
     _tasks[i]->clear_region_fields();
   }
+  _first_overflow_barrier_sync.abort();
+  _second_overflow_barrier_sync.abort();
   _has_aborted = true;
 
   SATBMarkQueueSet& satb_mq_set = JavaThread::satb_mark_queue_set();
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/concurrentMark.hpp
--- a/src/share/vm/gc_implementation/g1/concurrentMark.hpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/concurrentMark.hpp	Fri May 30 13:11:33 2014 -0700
@@ -542,8 +542,12 @@
   // frequently.
   HeapRegion* claim_region(uint worker_id);
 
-  // It determines whether we've run out of regions to scan.
-  bool        out_of_regions() { return _finger == _heap_end; }
+  // It determines whether we've run out of regions to scan. Note that
+  // the finger can point past the heap end in case the heap was expanded
+  // to satisfy an allocation without doing a GC. This is fine, because all
+  // objects in those regions will be considered live anyway because of
+  // SATB guarantees (i.e. their TAMS will be equal to bottom).
+  bool        out_of_regions() { return _finger >= _heap_end; }
 
   // Returns the task with the given id
   CMTask* task(int id) {
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp
--- a/src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/concurrentMarkThread.cpp	Fri May 30 13:11:33 2014 -0700
@@ -89,6 +89,10 @@
   while (!_should_terminate) {
     // wait until started is set.
     sleepBeforeNextCycle();
+    if (_should_terminate) {
+      break;
+    }
+
     {
       ResourceMark rm;
       HandleMark   hm;
@@ -303,11 +307,21 @@
 }
 
 void ConcurrentMarkThread::stop() {
-  // it is ok to take late safepoints here, if needed
-  MutexLockerEx mu(Terminator_lock);
-  _should_terminate = true;
-  while (!_has_terminated) {
-    Terminator_lock->wait();
+  {
+    MutexLockerEx ml(Terminator_lock);
+    _should_terminate = true;
+  }
+
+  {
+    MutexLockerEx ml(CGC_lock, Mutex::_no_safepoint_check_flag);
+    CGC_lock->notify_all();
+  }
+
+  {
+    MutexLockerEx ml(Terminator_lock);
+    while (!_has_terminated) {
+      Terminator_lock->wait();
+    }
   }
 }
 
@@ -327,11 +341,14 @@
   assert(!in_progress(), "should have been cleared");
 
   MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag);
-  while (!started()) {
+  while (!started() && !_should_terminate) {
     CGC_lock->wait(Mutex::_no_safepoint_check_flag);
   }
-  set_in_progress();
-  clear_started();
+
+  if (started()) {
+    set_in_progress();
+    clear_started();
+  }
 }
 
 // Note: As is the case with CMS - this method, although exported
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Fri May 30 13:11:33 2014 -0700
@@ -435,6 +435,9 @@
 void G1CollectedHeap::stop_conc_gc_threads() {
   _cg1r->stop();
   _cmThread->stop();
+  if (G1StringDedup::is_enabled()) {
+    G1StringDedup::stop();
+  }
 }
 
 #ifdef ASSERT
@@ -2182,6 +2185,23 @@
   return JNI_OK;
 }
 
+void G1CollectedHeap::stop() {
+#if 0
+  // Stopping concurrent worker threads is currently disabled until
+  // some bugs in concurrent mark has been resolve. Without fixing
+  // those bugs first we risk haning during VM exit when trying to
+  // stop these threads.
+
+  // Abort any ongoing concurrent root region scanning and stop all
+  // concurrent threads. We do this to make sure these threads do
+  // not continue to execute and access resources (e.g. gclog_or_tty)
+  // that are destroyed during shutdown.
+  _cm->root_regions()->abort();
+  _cm->root_regions()->wait_until_scan_finished();
+  stop_conc_gc_threads();
+#endif
+}
+
 size_t G1CollectedHeap::conservative_max_heap_alignment() {
   return HeapRegion::max_region_size();
 }
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp
--- a/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	Fri May 30 13:11:33 2014 -0700
@@ -1082,6 +1082,8 @@
   // specified by the policy object.
   jint initialize();
 
+  virtual void stop();
+
   // Return the (conservative) maximum heap alignment for any G1 heap
   static size_t conservative_max_heap_alignment();
 
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp
--- a/src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp	Fri May 30 13:11:33 2014 -0700
@@ -95,7 +95,15 @@
   jbyte *const first = byte_for(mr.start());
   jbyte *const last = byte_after(mr.last());
 
-  memset(first, g1_young_gen, last - first);
+  // Below we may use an explicit loop instead of memset() because on
+  // certain platforms memset() can give concurrent readers phantom zeros.
+  if (UseMemSetInBOT) {
+    memset(first, g1_young_gen, last - first);
+  } else {
+    for (jbyte* i = first; i < last; i++) {
+      *i = g1_young_gen;
+    }
+  }
 }
 
 #ifndef PRODUCT
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/g1StringDedup.cpp
--- a/src/share/vm/gc_implementation/g1/g1StringDedup.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1StringDedup.cpp	Fri May 30 13:11:33 2014 -0700
@@ -44,6 +44,11 @@
   }
 }
 
+void G1StringDedup::stop() {
+  assert(is_enabled(), "String deduplication not enabled");
+  G1StringDedupThread::stop();
+}
+
 bool G1StringDedup::is_candidate_from_mark(oop obj) {
   if (java_lang_String::is_instance(obj)) {
     bool from_young = G1CollectedHeap::heap()->heap_region_containing_raw(obj)->is_young();
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/g1StringDedup.hpp
--- a/src/share/vm/gc_implementation/g1/g1StringDedup.hpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1StringDedup.hpp	Fri May 30 13:11:33 2014 -0700
@@ -110,8 +110,12 @@
     return _enabled;
   }
 
+  // Initialize string deduplication.
   static void initialize();
 
+  // Stop the deduplication thread.
+  static void stop();
+
   // Immediately deduplicates the given String object, bypassing the
   // the deduplication queue.
   static void deduplicate(oop java_string);
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/g1StringDedupQueue.cpp
--- a/src/share/vm/gc_implementation/g1/g1StringDedupQueue.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1StringDedupQueue.cpp	Fri May 30 13:11:33 2014 -0700
@@ -35,6 +35,7 @@
 
 G1StringDedupQueue::G1StringDedupQueue() :
   _cursor(0),
+  _cancel(false),
   _empty(true),
   _dropped(0) {
   _nqueues = MAX2(ParallelGCThreads, (size_t)1);
@@ -55,11 +56,17 @@
 
 void G1StringDedupQueue::wait() {
   MonitorLockerEx ml(StringDedupQueue_lock, Mutex::_no_safepoint_check_flag);
-  while (_queue->_empty) {
+  while (_queue->_empty && !_queue->_cancel) {
     ml.wait(Mutex::_no_safepoint_check_flag);
   }
 }
 
+void G1StringDedupQueue::cancel_wait() {
+  MonitorLockerEx ml(StringDedupQueue_lock, Mutex::_no_safepoint_check_flag);
+  _queue->_cancel = true;
+  ml.notify();
+}
+
 void G1StringDedupQueue::push(uint worker_id, oop java_string) {
   assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint");
   assert(worker_id < _queue->_nqueues, "Invalid queue");
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/g1StringDedupQueue.hpp
--- a/src/share/vm/gc_implementation/g1/g1StringDedupQueue.hpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1StringDedupQueue.hpp	Fri May 30 13:11:33 2014 -0700
@@ -65,6 +65,7 @@
   G1StringDedupWorkerQueue*  _queues;
   size_t                     _nqueues;
   size_t                     _cursor;
+  bool                       _cancel;
   volatile bool              _empty;
 
   // Statistics counter, only used for logging.
@@ -81,6 +82,9 @@
   // Blocks and waits for the queue to become non-empty.
   static void wait();
 
+  // Wakes up any thread blocked waiting for the queue to become non-empty.
+  static void cancel_wait();
+
   // Pushes a deduplication candidate onto a specific GC worker queue.
   static void push(uint worker_id, oop java_string);
 
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/g1StringDedupThread.cpp
--- a/src/share/vm/gc_implementation/g1/g1StringDedupThread.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1StringDedupThread.cpp	Fri May 30 13:11:33 2014 -0700
@@ -73,6 +73,9 @@
 
     // Wait for the queue to become non-empty
     G1StringDedupQueue::wait();
+    if (_should_terminate) {
+      break;
+    }
 
     // Include this thread in safepoints
     stsJoin();
@@ -108,7 +111,23 @@
     stsLeave();
   }
 
-  ShouldNotReachHere();
+  terminate();
+}
+
+void G1StringDedupThread::stop() {
+  {
+    MonitorLockerEx ml(Terminator_lock);
+    _thread->_should_terminate = true;
+  }
+
+  G1StringDedupQueue::cancel_wait();
+
+  {
+    MonitorLockerEx ml(Terminator_lock);
+    while (!_thread->_has_terminated) {
+      ml.wait();
+    }
+  }
 }
 
 void G1StringDedupThread::print(outputStream* st, const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat) {
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_implementation/g1/g1StringDedupThread.hpp
--- a/src/share/vm/gc_implementation/g1/g1StringDedupThread.hpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_implementation/g1/g1StringDedupThread.hpp	Fri May 30 13:11:33 2014 -0700
@@ -47,6 +47,8 @@
 
 public:
   static void create();
+  static void stop();
+
   static G1StringDedupThread* thread();
 
   virtual void run();
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/gc_interface/collectedHeap.hpp
--- a/src/share/vm/gc_interface/collectedHeap.hpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/gc_interface/collectedHeap.hpp	Fri May 30 13:11:33 2014 -0700
@@ -208,6 +208,9 @@
   // This is the correct place to place such initialization methods.
   virtual void post_initialize() = 0;
 
+  // Stop any onging concurrent work and prepare for exit.
+  virtual void stop() {}
+
   MemRegion reserved_region() const { return _reserved; }
   address base() const { return (address)reserved_region().start(); }
 
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/memory/allocation.cpp
--- a/src/share/vm/memory/allocation.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/memory/allocation.cpp	Fri May 30 13:11:33 2014 -0700
@@ -561,6 +561,7 @@
   _chunk = new (alloc_failmode, len) Chunk(len);
 
   if (_chunk == NULL) {
+    _chunk = k;                 // restore the previous value of _chunk
     return NULL;
   }
   if (k) k->set_next(_chunk);   // Append new chunk to end of linked list
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/prims/jvmtiEnv.cpp
--- a/src/share/vm/prims/jvmtiEnv.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/prims/jvmtiEnv.cpp	Fri May 30 13:11:33 2014 -0700
@@ -307,9 +307,9 @@
       !java_lang_Class::is_primitive(mirror)) {
     Klass* k = java_lang_Class::as_Klass(mirror);
     assert(k != NULL, "class for non-primitive mirror must exist");
-    *size_ptr = k->size() * wordSize;
+    *size_ptr = (jlong)k->size() * wordSize;
   } else {
-    *size_ptr = mirror->size() * wordSize;
+    *size_ptr = (jlong)mirror->size() * wordSize;
     }
   return JVMTI_ERROR_NONE;
 } /* end GetObjectSize */
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/runtime/java.cpp
--- a/src/share/vm/runtime/java.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/runtime/java.cpp	Fri May 30 13:11:33 2014 -0700
@@ -497,6 +497,9 @@
     os::infinite_sleep();
   }
 
+  // Stop any ongoing concurrent GC work
+  Universe::heap()->stop();
+
   // Terminate watcher thread - must before disenrolling any periodic task
   if (PeriodicTask::num_tasks() > 0)
     WatcherThread::stop();
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/utilities/workgroup.cpp
--- a/src/share/vm/utilities/workgroup.cpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/utilities/workgroup.cpp	Fri May 30 13:11:33 2014 -0700
@@ -378,21 +378,22 @@
 
 WorkGangBarrierSync::WorkGangBarrierSync()
   : _monitor(Mutex::safepoint, "work gang barrier sync", true),
-    _n_workers(0), _n_completed(0), _should_reset(false) {
+    _n_workers(0), _n_completed(0), _should_reset(false), _aborted(false) {
 }
 
 WorkGangBarrierSync::WorkGangBarrierSync(uint n_workers, const char* name)
   : _monitor(Mutex::safepoint, name, true),
-    _n_workers(n_workers), _n_completed(0), _should_reset(false) {
+    _n_workers(n_workers), _n_completed(0), _should_reset(false), _aborted(false) {
 }
 
 void WorkGangBarrierSync::set_n_workers(uint n_workers) {
-  _n_workers   = n_workers;
-  _n_completed = 0;
+  _n_workers    = n_workers;
+  _n_completed  = 0;
   _should_reset = false;
+  _aborted      = false;
 }
 
-void WorkGangBarrierSync::enter() {
+bool WorkGangBarrierSync::enter() {
   MutexLockerEx x(monitor(), Mutex::_no_safepoint_check_flag);
   if (should_reset()) {
     // The should_reset() was set and we are the first worker to enter
@@ -415,10 +416,17 @@
     set_should_reset(true);
     monitor()->notify_all();
   } else {
-    while (n_completed() != n_workers()) {
+    while (n_completed() != n_workers() && !aborted()) {
       monitor()->wait(/* no_safepoint_check */ true);
     }
   }
+  return !aborted();
+}
+
+void WorkGangBarrierSync::abort() {
+  MutexLockerEx x(monitor(), Mutex::_no_safepoint_check_flag);
+  set_aborted();
+  monitor()->notify_all();
 }
 
 // SubTasksDone functions.
diff -r 460b0b08247f -r ee8b93466869 src/share/vm/utilities/workgroup.hpp
--- a/src/share/vm/utilities/workgroup.hpp	Wed May 28 02:27:39 2014 -0700
+++ b/src/share/vm/utilities/workgroup.hpp	Fri May 30 13:11:33 2014 -0700
@@ -359,18 +359,20 @@
 class WorkGangBarrierSync : public StackObj {
 protected:
   Monitor _monitor;
-  uint     _n_workers;
-  uint     _n_completed;
+  uint    _n_workers;
+  uint    _n_completed;
   bool    _should_reset;
+  bool    _aborted;
 
   Monitor* monitor()        { return &_monitor; }
   uint     n_workers()      { return _n_workers; }
   uint     n_completed()    { return _n_completed; }
   bool     should_reset()   { return _should_reset; }
+  bool     aborted()        { return _aborted; }
 
   void     zero_completed() { _n_completed = 0; }
   void     inc_completed()  { _n_completed++; }
-
+  void     set_aborted()    { _aborted = true; }
   void     set_should_reset(bool v) { _should_reset = v; }
 
 public:
@@ -383,8 +385,14 @@
 
   // Enter the barrier. A worker that enters the barrier will
   // not be allowed to leave until all other threads have
-  // also entered the barrier.
-  void enter();
+  // also entered the barrier or the barrier is aborted.
+  // Returns false if the barrier was aborted.
+  bool enter();
+
+  // Aborts the barrier and wakes up any threads waiting for
+  // the barrier to complete. The barrier will remain in the
+  // aborted state until the next call to set_n_workers().
+  void abort();
 };
 
 // A class to manage claiming of subtasks within a group of tasks.  The
diff -r 460b0b08247f -r ee8b93466869 test/TEST.groups
--- a/test/TEST.groups	Wed May 28 02:27:39 2014 -0700
+++ b/test/TEST.groups	Fri May 30 13:11:33 2014 -0700
@@ -134,6 +134,8 @@
   gc/arguments/TestDynMaxHeapFreeRatio.java \
   runtime/InternalApi/ThreadCpuTimesDeadlock.java \
   serviceability/threads/TestFalseDeadLock.java \
+  serviceability/jvmti/GetObjectSizeOverflow.java \
+  serviceability/jvmti/TestRedefineWithUnresolvedClass.java \
   compiler/tiered/NonTieredLevelsTest.java \
   compiler/tiered/TieredLevelsTest.java \
   compiler/intrinsics/bmi/verifycode
diff -r 460b0b08247f -r ee8b93466869 test/serviceability/jvmti/GetObjectSizeOverflow.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/serviceability/jvmti/GetObjectSizeOverflow.java	Fri May 30 13:11:33 2014 -0700
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2014 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+import java.io.PrintWriter;
+import com.oracle.java.testlibrary.*;
+
+/*
+ * Test to verify GetObjectSize does not overflow on a 600M element int[]
+ *
+ * @test
+ * @bug 8027230
+ * @library /testlibrary
+ * @build GetObjectSizeOverflowAgent
+ * @run main ClassFileInstaller GetObjectSizeOverflowAgent
+ * @run main GetObjectSizeOverflow
+ */
+public class GetObjectSizeOverflow {
+    public static void main(String[] args) throws Exception  {
+
+        if (!Platform.is64bit()) {
+            System.out.println("Test needs a 4GB heap and can only be run as a 64bit process, skipping.");
+            return;
+        }
+
+        PrintWriter pw = new PrintWriter("MANIFEST.MF");
+        pw.println("Premain-Class: GetObjectSizeOverflowAgent");
+        pw.close();
+
+        ProcessBuilder pb = new ProcessBuilder();
+        pb.command(new String[] { JDKToolFinder.getJDKTool("jar"), "cmf", "MANIFEST.MF", "agent.jar", "GetObjectSizeOverflowAgent.class"});
+        pb.start().waitFor();
+
+        ProcessBuilder pt = ProcessTools.createJavaProcessBuilder(true, "-Xmx4000m", "-javaagent:agent.jar",  "GetObjectSizeOverflowAgent");
+        OutputAnalyzer output = new OutputAnalyzer(pt.start());
+
+        if (output.getStdout().contains("Could not reserve enough space") || output.getStderr().contains("java.lang.OutOfMemoryError")) {
+            System.out.println("stdout: " + output.getStdout());
+            System.out.println("stderr: " + output.getStderr());
+            System.out.println("Test could not reserve or allocate enough space, skipping");
+            return;
+        }
+
+        output.stdoutShouldContain("GetObjectSizeOverflow passed");
+    }
+}
diff -r 460b0b08247f -r ee8b93466869 test/serviceability/jvmti/GetObjectSizeOverflowAgent.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/serviceability/jvmti/GetObjectSizeOverflowAgent.java	Fri May 30 13:11:33 2014 -0700
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2014, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+import java.lang.instrument.*;
+
+public class GetObjectSizeOverflowAgent {
+
+    static Instrumentation instrumentation;
+
+    public static void premain(String agentArgs, Instrumentation instrumentation) {
+        GetObjectSizeOverflowAgent.instrumentation = instrumentation;
+    }
+
+    public static void main(String[] args) throws Exception {
+        int[] a = new int[600_000_000];
+        long size = instrumentation.getObjectSize(a);
+
+        if (size < 2_400_000_000L) {
+            throw new RuntimeException("Invalid size of array, expected >= 2400000000, got " + size);
+        }
+
+        System.out.println("GetObjectSizeOverflow passed");
+    }
+}