hotspot/src/share/vm/gc/shared/barrierSet.hpp
author kbarrett
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8072817: CardTableExtension kind() should be BarrierSet::CardTableExtension Summary: Use BarrierSet::CardTableForRS where needed, and update concrete bs tags. Reviewed-by: jwilhelm, jmasa
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/*
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 * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_SHARED_BARRIERSET_HPP
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#define SHARE_VM_GC_SHARED_BARRIERSET_HPP
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#include "memory/memRegion.hpp"
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#include "oops/oopsHierarchy.hpp"
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#include "utilities/fakeRttiSupport.hpp"
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// This class provides the interface between a barrier implementation and
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// the rest of the system.
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class BarrierSet: public CHeapObj<mtGC> {
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  friend class VMStructs;
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public:
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  // Fake RTTI support.  For a derived class T to participate
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  // - T must have a corresponding Name entry.
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  // - GetName<T> must be specialized to return the corresponding Name
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  //   entry.
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  // - If T is a base class, the constructor must have a FakeRtti
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  //   parameter and pass it up to its base class, with the tag set
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  //   augmented with the corresponding Name entry.
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  // - If T is a concrete class, the constructor must create a
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  //   FakeRtti object whose tag set includes the corresponding Name
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  //   entry, and pass it up to its base class.
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  enum Name {                   // associated class
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    ModRef,                     // ModRefBarrierSet
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    CardTableModRef,            // CardTableModRefBS
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    CardTableForRS,             // CardTableModRefBSForCTRS
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    CardTableExtension,         // CardTableExtension
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    G1SATBCT,                   // G1SATBCardTableModRefBS
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    G1SATBCTLogging             // G1SATBCardTableLoggingModRefBS
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  };
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protected:
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  typedef FakeRttiSupport<BarrierSet, Name> FakeRtti;
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  FakeRtti _fake_rtti;
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  // Metafunction mapping a class derived from BarrierSet to the
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  // corresponding Name enum tag.
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  template<typename T> struct GetName;
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  // Downcast argument to a derived barrier set type.
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  // The cast is checked in a debug build.
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  // T must have a specialization for BarrierSet::GetName<T>.
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  template<typename T> friend T* barrier_set_cast(BarrierSet* bs);
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  // Note: This is not presently the Name corresponding to the
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  // concrete class of this object.
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  BarrierSet::Name kind() const { return _fake_rtti.concrete_tag(); }
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  // Test whether this object is of the type corresponding to bsn.
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  bool is_a(BarrierSet::Name bsn) const { return _fake_rtti.has_tag(bsn); }
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  // End of fake RTTI support.
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public:
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  enum Flags {
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    None                = 0,
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    TargetUninitialized = 1
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  };
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  // Some barrier sets create tables whose elements correspond to parts of
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  // the heap; the CardTableModRefBS is an example.  Such barrier sets will
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  // normally reserve space for such tables, and commit parts of the table
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  // "covering" parts of the heap that are committed. At most one covered
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  // region per generation is needed.
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  static const int _max_covered_regions = 2;
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  BarrierSet(const FakeRtti& fake_rtti) : _fake_rtti(fake_rtti) { }
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  ~BarrierSet() { }
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  // These operations indicate what kind of barriers the BarrierSet has.
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  virtual bool has_read_ref_barrier() = 0;
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  virtual bool has_read_prim_barrier() = 0;
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  virtual bool has_write_ref_barrier() = 0;
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  virtual bool has_write_ref_pre_barrier() = 0;
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  virtual bool has_write_prim_barrier() = 0;
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  // These functions indicate whether a particular access of the given
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  // kinds requires a barrier.
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  virtual bool read_ref_needs_barrier(void* field) = 0;
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  virtual bool read_prim_needs_barrier(HeapWord* field, size_t bytes) = 0;
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  virtual bool write_prim_needs_barrier(HeapWord* field, size_t bytes,
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                                        juint val1, juint val2) = 0;
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  // The first four operations provide a direct implementation of the
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  // barrier set.  An interpreter loop, for example, could call these
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  // directly, as appropriate.
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  // Invoke the barrier, if any, necessary when reading the given ref field.
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  virtual void read_ref_field(void* field) = 0;
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  // Invoke the barrier, if any, necessary when reading the given primitive
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  // "field" of "bytes" bytes in "obj".
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  virtual void read_prim_field(HeapWord* field, size_t bytes) = 0;
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  // Invoke the barrier, if any, necessary when writing "new_val" into the
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  // ref field at "offset" in "obj".
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  // (For efficiency reasons, this operation is specialized for certain
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  // barrier types.  Semantically, it should be thought of as a call to the
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  // virtual "_work" function below, which must implement the barrier.)
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  // First the pre-write versions...
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  template <class T> inline void write_ref_field_pre(T* field, oop new_val);
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private:
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  // Helper for write_ref_field_pre and friends, testing for specialized cases.
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  bool devirtualize_reference_writes() const;
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  // Keep this private so as to catch violations at build time.
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  virtual void write_ref_field_pre_work(     void* field, oop new_val) { guarantee(false, "Not needed"); };
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protected:
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  virtual void write_ref_field_pre_work(      oop* field, oop new_val) {};
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  virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) {};
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public:
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  // ...then the post-write version.
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  inline void write_ref_field(void* field, oop new_val, bool release = false);
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  virtual void write_ref_field_work(void* field, oop new_val, bool release = false) = 0;
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  // Invoke the barrier, if any, necessary when writing the "bytes"-byte
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  // value(s) "val1" (and "val2") into the primitive "field".
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  virtual void write_prim_field(HeapWord* field, size_t bytes,
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                                juint val1, juint val2) = 0;
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  // Operations on arrays, or general regions (e.g., for "clone") may be
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  // optimized by some barriers.
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  // The first six operations tell whether such an optimization exists for
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  // the particular barrier.
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  virtual bool has_read_ref_array_opt() = 0;
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  virtual bool has_read_prim_array_opt() = 0;
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  virtual bool has_write_ref_array_pre_opt() { return true; }
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  virtual bool has_write_ref_array_opt() = 0;
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  virtual bool has_write_prim_array_opt() = 0;
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  virtual bool has_read_region_opt() = 0;
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  virtual bool has_write_region_opt() = 0;
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  // These operations should assert false unless the corresponding operation
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  // above returns true.  Otherwise, they should perform an appropriate
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  // barrier for an array whose elements are all in the given memory region.
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  virtual void read_ref_array(MemRegion mr) = 0;
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  virtual void read_prim_array(MemRegion mr) = 0;
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  // Below length is the # array elements being written
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  virtual void write_ref_array_pre(oop* dst, int length,
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                                   bool dest_uninitialized = false) {}
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  virtual void write_ref_array_pre(narrowOop* dst, int length,
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                                   bool dest_uninitialized = false) {}
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  // Below count is the # array elements being written, starting
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  // at the address "start", which may not necessarily be HeapWord-aligned
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  inline void write_ref_array(HeapWord* start, size_t count);
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  // Static versions, suitable for calling from generated code;
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  // count is # array elements being written, starting with "start",
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  // which may not necessarily be HeapWord-aligned.
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  static void static_write_ref_array_pre(HeapWord* start, size_t count);
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  static void static_write_ref_array_post(HeapWord* start, size_t count);
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protected:
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  virtual void write_ref_array_work(MemRegion mr) = 0;
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public:
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  virtual void write_prim_array(MemRegion mr) = 0;
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  virtual void read_region(MemRegion mr) = 0;
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  // (For efficiency reasons, this operation is specialized for certain
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  // barrier types.  Semantically, it should be thought of as a call to the
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  // virtual "_work" function below, which must implement the barrier.)
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  void write_region(MemRegion mr);
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protected:
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  virtual void write_region_work(MemRegion mr) = 0;
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public:
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  // Inform the BarrierSet that the the covered heap region that starts
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  // with "base" has been changed to have the given size (possibly from 0,
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  // for initialization.)
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  virtual void resize_covered_region(MemRegion new_region) = 0;
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  // If the barrier set imposes any alignment restrictions on boundaries
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  // within the heap, this function tells whether they are met.
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  virtual bool is_aligned(HeapWord* addr) = 0;
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  // Print a description of the memory for the barrier set
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  virtual void print_on(outputStream* st) const = 0;
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};
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template<typename T>
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inline T* barrier_set_cast(BarrierSet* bs) {
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  assert(bs->is_a(BarrierSet::GetName<T>::value), "wrong type of barrier set");
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  return static_cast<T*>(bs);
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}
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#endif // SHARE_VM_GC_SHARED_BARRIERSET_HPP