diff --git a/src/cpu/x86/vm/interp_masm_x86_32.cpp b/src/cpu/x86/vm/interp_masm_x86_32.cpp
index 8a132c12fcaf33a9f01a316714bdecd6774193f1..84cdc94dd19b1f9b4a77b9c265f7015ec972dfc3 100644
--- a/src/cpu/x86/vm/interp_masm_x86_32.cpp
+++ b/src/cpu/x86/vm/interp_masm_x86_32.cpp
@@ -1,5 +1,5 @@
 /*
- * 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
@@ -1445,5 +1445,7 @@ void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr,
   incrementl(scratch, increment);
   movl(counter_addr, scratch);
   andl(scratch, mask);
-  jcc(cond, *where);
+  if (where != NULL) {
+    jcc(cond, *where);
+  }
 }
diff --git a/src/cpu/x86/vm/interp_masm_x86_64.cpp b/src/cpu/x86/vm/interp_masm_x86_64.cpp
index 693ac795815bf7891f071b51ad61f3dbdc5916d5..727207ec13ea9cfddf3e7d24c8017af5cf3b6707 100644
--- a/src/cpu/x86/vm/interp_masm_x86_64.cpp
+++ b/src/cpu/x86/vm/interp_masm_x86_64.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2016, 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
@@ -1505,5 +1505,7 @@ void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr,
   incrementl(scratch, increment);
   movl(counter_addr, scratch);
   andl(scratch, mask);
-  jcc(cond, *where);
+  if (where != NULL) {
+    jcc(cond, *where);
+  }
 }
diff --git a/src/cpu/x86/vm/templateTable_x86_32.cpp b/src/cpu/x86/vm/templateTable_x86_32.cpp
index df497868b6f99f93767b013ab065f20b974ded89..5d33addcc432f82a7e2fe33af117ddc08944be80 100644
--- a/src/cpu/x86/vm/templateTable_x86_32.cpp
+++ b/src/cpu/x86/vm/templateTable_x86_32.cpp
@@ -1,5 +1,5 @@
 /*
- * 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
@@ -1640,15 +1640,16 @@ void TemplateTable::branch(bool is_jsr, bool is_wide) {
         // Increment the MDO backedge counter
         const Address mdo_backedge_counter(rbx, in_bytes(MethodData::backedge_counter_offset()) +
                                                 in_bytes(InvocationCounter::counter_offset()));
-        __ increment_mask_and_jump(mdo_backedge_counter, increment, mask,
-                                   rax, false, Assembler::zero, &backedge_counter_overflow);
+        __ increment_mask_and_jump(mdo_backedge_counter, increment, mask, rax, false, Assembler::zero,
+                                   UseOnStackReplacement ? &backedge_counter_overflow : NULL);
         __ jmp(dispatch);
       }
       __ bind(no_mdo);
       // Increment backedge counter in MethodCounters*
       __ movptr(rcx, Address(rcx, Method::method_counters_offset()));
       __ increment_mask_and_jump(Address(rcx, be_offset), increment, mask,
-                                 rax, false, Assembler::zero, &backedge_counter_overflow);
+                                 rax, false, Assembler::zero,
+                                 UseOnStackReplacement ? &backedge_counter_overflow : NULL);
     } else {
       // increment counter
       __ movptr(rcx, Address(rcx, Method::method_counters_offset()));
diff --git a/src/cpu/x86/vm/templateTable_x86_64.cpp b/src/cpu/x86/vm/templateTable_x86_64.cpp
index 301acb440212a1e1b0778c3ace91628395e41336..a619f44d66cdaec61b463352c3c039b7b11dc083 100644
--- a/src/cpu/x86/vm/templateTable_x86_64.cpp
+++ b/src/cpu/x86/vm/templateTable_x86_64.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2017, 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
@@ -1665,15 +1665,16 @@ void TemplateTable::branch(bool is_jsr, bool is_wide) {
         // Increment the MDO backedge counter
         const Address mdo_backedge_counter(rbx, in_bytes(MethodData::backedge_counter_offset()) +
                                            in_bytes(InvocationCounter::counter_offset()));
-        __ increment_mask_and_jump(mdo_backedge_counter, increment, mask,
-                                   rax, false, Assembler::zero, &backedge_counter_overflow);
+        __ increment_mask_and_jump(mdo_backedge_counter, increment, mask, rax, false, Assembler::zero,
+                                   UseOnStackReplacement ? &backedge_counter_overflow : NULL);
         __ jmp(dispatch);
       }
       __ bind(no_mdo);
       // Increment backedge counter in MethodCounters*
       __ movptr(rcx, Address(rcx, Method::method_counters_offset()));
       __ increment_mask_and_jump(Address(rcx, be_offset), increment, mask,
-                                 rax, false, Assembler::zero, &backedge_counter_overflow);
+                                 rax, false, Assembler::zero,
+                                 UseOnStackReplacement ? &backedge_counter_overflow : NULL);
     } else {
       // increment counter
       __ movptr(rcx, Address(rcx, Method::method_counters_offset()));
diff --git a/src/share/vm/asm/assembler.hpp b/src/share/vm/asm/assembler.hpp
index ec8ec5eb435f9e38b0e60b78ee7f4930167d24c6..ac39e6ac4e2ccbb35b25fb64d0d0fa82a3d408b5 100644
--- a/src/share/vm/asm/assembler.hpp
+++ b/src/share/vm/asm/assembler.hpp
@@ -1,5 +1,5 @@
 /*
- * 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
@@ -169,6 +169,14 @@ class Label VALUE_OBJ_CLASS_SPEC {
   Label() {
     init();
   }
+
+  ~Label() {
+    assert(is_bound() || is_unused(), "Label was never bound to a location, but it was used as a jmp target");
+  }
+
+  void reset() {
+    init(); //leave _patch_overflow because it points to CodeBuffer.
+  }
 };
 
 // A union type for code which has to assemble both constant and
diff --git a/src/share/vm/c1/c1_LIRAssembler.cpp b/src/share/vm/c1/c1_LIRAssembler.cpp
index 3447e0703e292a905e2660ecbee70221b2f586bb..a2cf5f26996f595199a82b94e58305f4caeb315c 100644
--- a/src/share/vm/c1/c1_LIRAssembler.cpp
+++ b/src/share/vm/c1/c1_LIRAssembler.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 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
@@ -128,6 +128,9 @@ LIR_Assembler::LIR_Assembler(Compilation* c):
 
 
 LIR_Assembler::~LIR_Assembler() {
+  // The unwind handler label may be unbound if this destructor is invoked because of a bail-out.
+  // Reset it here to avoid an assertion.
+  _unwind_handler_entry.reset();
 }