src/share/vm/gc/g1/heapRegion.cpp

rev 12504 : 8173764: G1 BOT wrongly assumes that objects must always begin at the start of G1BlockOffsetTablePart
Reviewed-by:
rev 12505 : imported patch 8173764-rev-tschatzl

*** 1,7 ****
  /*
!  * Copyright (c) 2001, 2016, 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.
--- 1,7 ----
  /*
!  * Copyright (c) 2001, 2017, 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.
*** 265,281 ****
--- 265,285 ----
    assert(first_hr->is_starts_humongous(), "pre-condition");
  
    report_region_type_change(G1HeapRegionTraceType::ContinuesHumongous);
    _type.set_continues_humongous();
    _humongous_start_region = first_hr;
+ 
+   _bot_part.set_object_can_span(true);
  }
  
  void HeapRegion::clear_humongous() {
    assert(is_humongous(), "pre-condition");
  
    assert(capacity() == HeapRegion::GrainBytes, "pre-condition");
    _humongous_start_region = NULL;
+ 
+   _bot_part.set_object_can_span(false);
  }
  
  HeapRegion::HeapRegion(uint hrm_index,
                         G1BlockOffsetTable* bot,
                         MemRegion mr) :