src/share/vm/gc/g1/g1BlockOffsetTable.hpp

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
rev 12506 : [mq]: 8173764-rev-kbarret

*** 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.
*** 115,124 ****
--- 115,127 ----
  private:
    // allocation boundary at which offset array must be updated
    HeapWord* _next_offset_threshold;
    size_t    _next_offset_index;      // index corresponding to that boundary
  
+   // Indicates if an object can span into this G1BlockOffsetTablePart.
+   debug_only(bool _object_can_span;)
+ 
    // This is the global BlockOffsetTable.
    G1BlockOffsetTable* _bot;
  
    // The space that owns this subregion.
    G1ContiguousSpace* _space;
*** 222,231 ****
--- 225,235 ----
    void alloc_block(HeapWord* blk, size_t size) {
      alloc_block(blk, blk+size);
    }
  
    void set_for_starts_humongous(HeapWord* obj_top, size_t fill_size);
+   void set_object_can_span(bool can_span) NOT_DEBUG_RETURN;
  
    void print_on(outputStream* out) PRODUCT_RETURN;
  };
  
  #endif // SHARE_VM_GC_G1_G1BLOCKOFFSETTABLE_HPP