--- a/src/hotspot/share/gc/g1/g1Allocator.cpp	Thu Jan 09 10:01:01 2020 -0500
+++ b/src/hotspot/share/gc/g1/g1Allocator.cpp	Thu Jan 09 21:57:18 2020 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -412,8 +412,7 @@
 }
 
 bool G1ArchiveAllocator::_archive_check_enabled = false;
-G1ArchiveRegionMap G1ArchiveAllocator::_closed_archive_region_map;
-G1ArchiveRegionMap G1ArchiveAllocator::_open_archive_region_map;
+G1ArchiveRegionMap G1ArchiveAllocator::_archive_region_map;
 
 G1ArchiveAllocator* G1ArchiveAllocator::create_allocator(G1CollectedHeap* g1h, bool open) {
   // Create the archive allocator, and also enable archive object checking

--- a/src/hotspot/share/gc/g1/g1Allocator.hpp	Thu Jan 09 10:01:01 2020 -0500
+++ b/src/hotspot/share/gc/g1/g1Allocator.hpp	Thu Jan 09 21:57:18 2020 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -203,12 +203,17 @@
   void undo_allocation(G1HeapRegionAttr dest, HeapWord* obj, size_t word_sz, uint node_index);
 };
 
-// G1ArchiveRegionMap is a boolean array used to mark G1 regions as
+// G1ArchiveRegionMap is an array used to mark G1 regions as
 // archive regions.  This allows a quick check for whether an object
 // should not be marked because it is in an archive region.
-class G1ArchiveRegionMap : public G1BiasedMappedArray<bool> {
+class G1ArchiveRegionMap : public G1BiasedMappedArray<uint8_t> {
+public:
+  static const uint8_t NoArchive = 0;
+  static const uint8_t OpenArchive = 1;
+  static const uint8_t ClosedArchive = 2;
+
 protected:
-  bool default_value() const { return false; }
+  uint8_t default_value() const { return NoArchive; }
 };
 
 // G1ArchiveAllocator is used to allocate memory in archive
@@ -290,7 +295,7 @@
 
   // Mark regions containing the specified address range as archive/non-archive.
   static inline void set_range_archive(MemRegion range, bool open);
-  static inline void clear_range_archive(MemRegion range, bool open);
+  static inline void clear_range_archive(MemRegion range);
 
   // Check if the object is in closed archive
   static inline bool is_closed_archive_object(oop object);
@@ -301,8 +306,7 @@
 
 private:
   static bool _archive_check_enabled;
-  static G1ArchiveRegionMap  _closed_archive_region_map;
-  static G1ArchiveRegionMap  _open_archive_region_map;
+  static G1ArchiveRegionMap  _archive_region_map;
 
   // Check if an object is in a closed archive region using the _closed_archive_region_map.
   static inline bool in_closed_archive_range(oop object);

--- a/src/hotspot/share/gc/g1/g1Allocator.inline.hpp	Thu Jan 09 10:01:01 2020 -0500
+++ b/src/hotspot/share/gc/g1/g1Allocator.inline.hpp	Thu Jan 09 21:57:18 2020 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2020, 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
@@ -131,12 +131,9 @@
 
   _archive_check_enabled = true;
   size_t length = G1CollectedHeap::heap()->max_reserved_capacity();
-  _closed_archive_region_map.initialize(G1CollectedHeap::heap()->base(),
-                                        G1CollectedHeap::heap()->base() + length,
-                                        HeapRegion::GrainBytes);
-  _open_archive_region_map.initialize(G1CollectedHeap::heap()->base(),
-                                      G1CollectedHeap::heap()->base() + length,
-                                      HeapRegion::GrainBytes);
+  _archive_region_map.initialize(G1CollectedHeap::heap()->base(),
+                                 G1CollectedHeap::heap()->base() + length,
+                                 HeapRegion::GrainBytes);
 }
 
 // Set the regions containing the specified address range as archive.
@@ -146,36 +143,26 @@
                      open ? "open" : "closed",
                      p2i(range.start()),
                      p2i(range.last()));
-  if (open) {
-    _open_archive_region_map.set_by_address(range, true);
-  } else {
-    _closed_archive_region_map.set_by_address(range, true);
-  }
+  uint8_t const value = open ? G1ArchiveRegionMap::OpenArchive : G1ArchiveRegionMap::ClosedArchive;
+  _archive_region_map.set_by_address(range, value);
 }
 
 // Clear the archive regions map containing the specified address range.
-inline void G1ArchiveAllocator::clear_range_archive(MemRegion range, bool open) {
+inline void G1ArchiveAllocator::clear_range_archive(MemRegion range) {
   assert(_archive_check_enabled, "archive range check not enabled");
-  log_info(gc, cds)("Clear %s archive regions in map: [" PTR_FORMAT ", " PTR_FORMAT "]",
-                    open ? "open" : "closed",
+  log_info(gc, cds)("Clear archive regions in map: [" PTR_FORMAT ", " PTR_FORMAT "]",
                     p2i(range.start()),
                     p2i(range.last()));
-  if (open) {
-    _open_archive_region_map.set_by_address(range, false);
-  } else {
-    _closed_archive_region_map.set_by_address(range, false);
-  }
+  _archive_region_map.set_by_address(range, G1ArchiveRegionMap::NoArchive);
 }
 
 // Check if an object is in a closed archive region using the _archive_region_map.
 inline bool G1ArchiveAllocator::in_closed_archive_range(oop object) {
-  // This is the out-of-line part of is_closed_archive_object test, done separately
-  // to avoid additional performance impact when the check is not enabled.
-  return _closed_archive_region_map.get_by_address((HeapWord*)object);
+  return _archive_region_map.get_by_address((HeapWord*)object) == G1ArchiveRegionMap::ClosedArchive;
 }
 
 inline bool G1ArchiveAllocator::in_open_archive_range(oop object) {
-  return _open_archive_region_map.get_by_address((HeapWord*)object);
+  return _archive_region_map.get_by_address((HeapWord*)object) == G1ArchiveRegionMap::OpenArchive;
 }
 
 // Check if archive object checking is enabled, to avoid calling in_open/closed_archive_range
@@ -193,8 +180,8 @@
 }
 
 inline bool G1ArchiveAllocator::is_archived_object(oop object) {
-  return (archive_check_enabled() && (in_closed_archive_range(object) ||
-                                      in_open_archive_range(object)));
+  return archive_check_enabled() &&
+         (_archive_region_map.get_by_address((HeapWord*)object) != G1ArchiveRegionMap::NoArchive);
 }
 
 #endif // SHARE_GC_G1_G1ALLOCATOR_INLINE_HPP

--- a/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	Thu Jan 09 10:01:01 2020 -0500
+++ b/src/hotspot/share/gc/g1/g1CollectedHeap.cpp	Thu Jan 09 21:57:18 2020 +0100
@@ -766,7 +766,7 @@
   return result;
 }
 
-void G1CollectedHeap::dealloc_archive_regions(MemRegion* ranges, size_t count, bool is_open) {
+void G1CollectedHeap::dealloc_archive_regions(MemRegion* ranges, size_t count) {
   assert(!is_init_completed(), "Expect to be called at JVM init time");
   assert(ranges != NULL, "MemRegion array NULL");
   assert(count != 0, "No MemRegions provided");
@@ -828,7 +828,7 @@
     }
 
     // Notify mark-sweep that this is no longer an archive range.
-    G1ArchiveAllocator::clear_range_archive(ranges[i], is_open);
+    G1ArchiveAllocator::clear_range_archive(ranges[i]);
   }
 
   if (uncommitted_regions != 0) {

--- a/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	Thu Jan 09 10:01:01 2020 -0500
+++ b/src/hotspot/share/gc/g1/g1CollectedHeap.hpp	Thu Jan 09 21:57:18 2020 +0100
@@ -723,7 +723,7 @@
   // which had been allocated by alloc_archive_regions. This should be called
   // rather than fill_archive_regions at JVM init time if the archive file
   // mapping failed, with the same non-overlapping and sorted MemRegion array.
-  void dealloc_archive_regions(MemRegion* range, size_t count, bool is_open);
+  void dealloc_archive_regions(MemRegion* range, size_t count);
 
   oop materialize_archived_object(oop obj);
 

--- a/src/hotspot/share/memory/filemap.cpp	Thu Jan 09 10:01:01 2020 -0500
+++ b/src/hotspot/share/memory/filemap.cpp	Thu Jan 09 21:57:18 2020 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2020, 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
@@ -1790,7 +1790,7 @@
                                 si->allow_exec());
     if (base == NULL || base != addr) {
       // dealloc the regions from java heap
-      dealloc_archive_heap_regions(regions, region_num, is_open_archive);
+      dealloc_archive_heap_regions(regions, region_num);
       log_info(cds)("UseSharedSpaces: Unable to map at required address in java heap. "
                     INTPTR_FORMAT ", size = " SIZE_FORMAT " bytes",
                     p2i(addr), regions[i].byte_size());
@@ -1799,7 +1799,7 @@
 
     if (VerifySharedSpaces && !region_crc_check(addr, regions[i].byte_size(), si->crc())) {
       // dealloc the regions from java heap
-      dealloc_archive_heap_regions(regions, region_num, is_open_archive);
+      dealloc_archive_heap_regions(regions, region_num);
       log_info(cds)("UseSharedSpaces: mapped heap regions are corrupt");
       return false;
     }
@@ -1855,10 +1855,10 @@
 }
 
 // dealloc the archive regions from java heap
-void FileMapInfo::dealloc_archive_heap_regions(MemRegion* regions, int num, bool is_open) {
+void FileMapInfo::dealloc_archive_heap_regions(MemRegion* regions, int num) {
   if (num > 0) {
     assert(regions != NULL, "Null archive ranges array with non-zero count");
-    G1CollectedHeap::heap()->dealloc_archive_regions(regions, num, is_open);
+    G1CollectedHeap::heap()->dealloc_archive_regions(regions, num);
   }
 }
 #endif // INCLUDE_CDS_JAVA_HEAP
@@ -2075,11 +2075,9 @@
     // Dealloc the archive heap regions only without unmapping. The regions are part
     // of the java heap. Unmapping of the heap regions are managed by GC.
     map_info->dealloc_archive_heap_regions(open_archive_heap_ranges,
-                                           num_open_archive_heap_ranges,
-                                           true);
+                                           num_open_archive_heap_ranges);
     map_info->dealloc_archive_heap_regions(closed_archive_heap_ranges,
-                                           num_closed_archive_heap_ranges,
-                                           false);
+                                           num_closed_archive_heap_ranges);
   } else if (DumpSharedSpaces) {
     fail_stop("%s", msg);
   }

--- a/src/hotspot/share/memory/filemap.hpp	Thu Jan 09 10:01:01 2020 -0500
+++ b/src/hotspot/share/memory/filemap.hpp	Thu Jan 09 21:57:18 2020 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2020, 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
@@ -538,7 +538,7 @@
   bool  map_heap_data(MemRegion **heap_mem, int first, int max, int* num,
                       bool is_open = false) NOT_CDS_JAVA_HEAP_RETURN_(false);
   bool  region_crc_check(char* buf, size_t size, int expected_crc) NOT_CDS_RETURN_(false);
-  void  dealloc_archive_heap_regions(MemRegion* regions, int num, bool is_open) NOT_CDS_JAVA_HEAP_RETURN;
+  void  dealloc_archive_heap_regions(MemRegion* regions, int num) NOT_CDS_JAVA_HEAP_RETURN;
   void  map_heap_regions_impl() NOT_CDS_JAVA_HEAP_RETURN;
   char* map_relocation_bitmap(size_t& bitmap_size);
   MapArchiveResult map_region(int i, intx addr_delta, char* mapped_base_address, ReservedSpace rs);