--- old/src/os/windows/vm/os_windows.cpp	2018-06-15 02:10:13.754546162 -0700
+++ new/src/os/windows/vm/os_windows.cpp	2018-06-15 02:10:13.662537912 -0700
@@ -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
@@ -2187,13 +2187,6 @@
 // Windows Vista/2008 heap corruption check
 #define EXCEPTION_HEAP_CORRUPTION        0xC0000374
 
-#define def_excpt(val) #val, val
-
-struct siglabel {
-  char *name;
-  int   number;
-};
-
 // All Visual C++ exceptions thrown from code generated by the Microsoft Visual
 // C++ compiler contain this error code. Because this is a compiler-generated
 // error, the code is not listed in the Win32 API header files.
@@ -2203,8 +2196,9 @@
 
 #define EXCEPTION_UNCAUGHT_CXX_EXCEPTION    0xE06D7363
 
+#define def_excpt(val) { #val, (val) }
 
-struct siglabel exceptlabels[] = {
+static const struct { char* name; uint number; } exceptlabels[] = {
     def_excpt(EXCEPTION_ACCESS_VIOLATION),
     def_excpt(EXCEPTION_DATATYPE_MISALIGNMENT),
     def_excpt(EXCEPTION_BREAKPOINT),
@@ -2229,16 +2223,16 @@
     def_excpt(EXCEPTION_GUARD_PAGE),
     def_excpt(EXCEPTION_INVALID_HANDLE),
     def_excpt(EXCEPTION_UNCAUGHT_CXX_EXCEPTION),
-    def_excpt(EXCEPTION_HEAP_CORRUPTION),
+    def_excpt(EXCEPTION_HEAP_CORRUPTION)
 #ifdef _M_IA64
-    def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
+    , def_excpt(EXCEPTION_REG_NAT_CONSUMPTION),
 #endif
-    NULL, 0
 };
 
 const char* os::exception_name(int exception_code, char *buf, size_t size) {
-  for (int i = 0; exceptlabels[i].name != NULL; i++) {
-    if (exceptlabels[i].number == exception_code) {
+  uint code = static_cast<uint>(exception_code);
+  for (uint i = 0; i < ARRAY_SIZE(exceptlabels); ++i) {
+    if (exceptlabels[i].number == code) {
        jio_snprintf(buf, size, "%s", exceptlabels[i].name);
        return buf;
     }