view src/hotspot/share/gc/shared/gcThreadLocalData.hpp @ 52321:31b159f30fb2

8180193: Make marking bitmap code available to other GCs Reviewed-by: shade, stefank
author rkennke
date Wed, 29 Aug 2018 20:15:09 +0200
parents 93d84f667d12
children 6728c41f2a08
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 * published by the Free Software Foundation.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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#include "utilities/globalDefinitions.hpp"

// Thread local data area for GC-specific information. Each GC
// is free to decide the internal structure and contents of this
// area. It is represented as a 64-bit aligned opaque blob to
// avoid circular dependencies between Thread and all GCs. For
// the same reason, the size of the data area is hard coded to
// provide enough space for all current GCs. Adjust the size if
// needed, but avoid making it excessively large as it adds to
// the memory overhead of creating a thread.
// Use Thread::gc_data<T>() to access the data, where T is the
// GC-specific type describing the structure of the data. GCs
// should consider placing frequently accessed fields first in
// T, so that field offsets relative to Thread are small, which
// often allows for a more compact instruction encoding.
typedef uint64_t GCThreadLocalData[18]; // 144 bytes