hotspot/src/share/vm/memory/iterator.hpp
author jrose
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/*
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 * Copyright 1997-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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// The following classes are C++ `closures` for iterating over objects, roots and spaces
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class CodeBlob;
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class ReferenceProcessor;
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class DataLayout;
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// Closure provides abortability.
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class Closure : public StackObj {
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 protected:
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  bool _abort;
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  void set_abort() { _abort = true; }
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 public:
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  Closure() : _abort(false) {}
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  // A subtype can use this mechanism to indicate to some iterator mapping
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  // functions that the iteration should cease.
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  bool abort() { return _abort; }
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  void clear_abort() { _abort = false; }
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};
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// OopClosure is used for iterating through roots (oop*)
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class OopClosure : public Closure {
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  ReferenceProcessor* _ref_processor;
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  OopClosure(ReferenceProcessor* rp) : _ref_processor(rp) { }
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  OopClosure() : _ref_processor(NULL) { }
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  virtual void do_oop(oop* o) = 0;
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  virtual void do_oop_v(oop* o) { do_oop(o); }
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  virtual void do_oop(narrowOop* o) = 0;
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  virtual void do_oop_v(narrowOop* o) { do_oop(o); }
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  // In support of post-processing of weak links of KlassKlass objects;
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  // see KlassKlass::oop_oop_iterate().
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  virtual const bool should_remember_klasses() const {
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    assert(!must_remember_klasses(), "Should have overriden this method.");
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    return false;
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  }
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  virtual void remember_klass(Klass* k) { /* do nothing */ }
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  // In support of post-processing of weak references in
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  // ProfileData (MethodDataOop) objects; see, for example,
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  // VirtualCallData::oop_iterate().
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  virtual const bool should_remember_mdo() const { return false; }
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  virtual void remember_mdo(DataLayout* v) { /* do nothing */ }
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  // If "true", invoke on nmethods (when scanning compiled frames).
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  virtual const bool do_nmethods() const { return false; }
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  // The methods below control how object iterations invoking this closure
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  // should be performed:
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  // If "true", invoke on header klass field.
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  bool do_header() { return true; } // Note that this is non-virtual.
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  // Controls how prefetching is done for invocations of this closure.
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  Prefetch::style prefetch_style() { // Note that this is non-virtual.
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    return Prefetch::do_none;
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  }
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  // True iff this closure may be safely applied more than once to an oop
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  // location without an intervening "major reset" (like the end of a GC).
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  virtual bool idempotent() { return false; }
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  virtual bool apply_to_weak_ref_discovered_field() { return false; }
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#ifdef ASSERT
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  static bool _must_remember_klasses;
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  static bool must_remember_klasses();
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  static void set_must_remember_klasses(bool v);
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#endif
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};
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// ObjectClosure is used for iterating through an object space
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class ObjectClosure : public Closure {
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  // Called for each object.
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  virtual void do_object(oop obj) = 0;
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};
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class BoolObjectClosure : public ObjectClosure {
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  virtual bool do_object_b(oop obj) = 0;
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};
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// Applies an oop closure to all ref fields in objects iterated over in an
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// object iteration.
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class ObjectToOopClosure: public ObjectClosure {
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  OopClosure* _cl;
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  void do_object(oop obj);
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  ObjectToOopClosure(OopClosure* cl) : _cl(cl) {}
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};
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// A version of ObjectClosure with "memory" (see _previous_address below)
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class UpwardsObjectClosure: public BoolObjectClosure {
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  HeapWord* _previous_address;
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  UpwardsObjectClosure() : _previous_address(NULL) { }
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  void set_previous(HeapWord* addr) { _previous_address = addr; }
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  HeapWord* previous()              { return _previous_address; }
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  // A return value of "true" can be used by the caller to decide
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  // if this object's end should *NOT* be recorded in
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  // _previous_address above.
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  virtual bool do_object_bm(oop obj, MemRegion mr) = 0;
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};
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// A version of ObjectClosure that is expected to be robust
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// in the face of possibly uninitialized objects.
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class ObjectClosureCareful : public ObjectClosure {
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  virtual size_t do_object_careful_m(oop p, MemRegion mr) = 0;
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  virtual size_t do_object_careful(oop p) = 0;
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};
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// The following are used in CompactibleFreeListSpace and
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// ConcurrentMarkSweepGeneration.
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// Blk closure (abstract class)
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class BlkClosure : public StackObj {
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  virtual size_t do_blk(HeapWord* addr) = 0;
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};
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// A version of BlkClosure that is expected to be robust
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// in the face of possibly uninitialized objects.
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class BlkClosureCareful : public BlkClosure {
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  size_t do_blk(HeapWord* addr) {
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    guarantee(false, "call do_blk_careful instead");
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    return 0;
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  }
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  virtual size_t do_blk_careful(HeapWord* addr) = 0;
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};
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// SpaceClosure is used for iterating over spaces
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class Space;
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class CompactibleSpace;
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class SpaceClosure : public StackObj {
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  // Called for each space
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  virtual void do_space(Space* s) = 0;
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};
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class CompactibleSpaceClosure : public StackObj {
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  // Called for each compactible space
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  virtual void do_space(CompactibleSpace* s) = 0;
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};
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// CodeBlobClosure is used for iterating through code blobs
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// in the code cache or on thread stacks
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class CodeBlobClosure : public Closure {
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  // Called for each code blob.
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  virtual void do_code_blob(CodeBlob* cb) = 0;
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};
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class MarkingCodeBlobClosure : public CodeBlobClosure {
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 public:
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  // Called for each code blob, but at most once per unique blob.
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  virtual void do_newly_marked_nmethod(CodeBlob* cb) = 0;
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  virtual void do_code_blob(CodeBlob* cb);
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    // = { if (!nmethod(cb)->test_set_oops_do_mark())  do_newly_marked_nmethod(cb); }
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  class MarkScope : public StackObj {
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  protected:
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    bool _active;
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  public:
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    MarkScope(bool activate = true);
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      // = { if (active) nmethod::oops_do_marking_prologue(); }
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    ~MarkScope();
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      // = { if (active) nmethod::oops_do_marking_epilogue(); }
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  };
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};
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// Applies an oop closure to all ref fields in code blobs
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// iterated over in an object iteration.
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class CodeBlobToOopClosure: public MarkingCodeBlobClosure {
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  OopClosure* _cl;
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  bool _do_marking;
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public:
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  virtual void do_newly_marked_nmethod(CodeBlob* cb);
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    // = { cb->oops_do(_cl); }
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  virtual void do_code_blob(CodeBlob* cb);
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    // = { if (_do_marking)  super::do_code_blob(cb); else cb->oops_do(_cl); }
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  CodeBlobToOopClosure(OopClosure* cl, bool do_marking)
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    : _cl(cl), _do_marking(do_marking) {}
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};
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1
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// MonitorClosure is used for iterating over monitors in the monitors cache
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class ObjectMonitor;
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class MonitorClosure : public StackObj {
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 public:
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  // called for each monitor in cache
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  virtual void do_monitor(ObjectMonitor* m) = 0;
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};
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// A closure that is applied without any arguments.
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class VoidClosure : public StackObj {
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 public:
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  // I would have liked to declare this a pure virtual, but that breaks
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  // in mysterious ways, for unknown reasons.
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  virtual void do_void();
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};
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// YieldClosure is intended for use by iteration loops
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// to incrementalize their work, allowing interleaving
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// of an interruptable task so as to allow other
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// threads to run (which may not otherwise be able to access
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// exclusive resources, for instance). Additionally, the
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// closure also allows for aborting an ongoing iteration
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// by means of checking the return value from the polling
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// call.
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class YieldClosure : public StackObj {
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  public:
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   virtual bool should_return() = 0;
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};
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// Abstract closure for serializing data (read or write).
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class SerializeOopClosure : public OopClosure {
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public:
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  // Return bool indicating whether closure implements read or write.
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  virtual bool reading() const = 0;
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  // Read/write the int pointed to by i.
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  virtual void do_int(int* i) = 0;
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  // Read/write the size_t pointed to by i.
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  virtual void do_size_t(size_t* i) = 0;
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  // Read/write the void pointer pointed to by p.
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  virtual void do_ptr(void** p) = 0;
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  // Read/write the HeapWord pointer pointed to be p.
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  virtual void do_ptr(HeapWord** p) = 0;
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  // Read/write the region specified.
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  virtual void do_region(u_char* start, size_t size) = 0;
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  // Check/write the tag.  If reading, then compare the tag against
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  // the passed in value and fail is they don't match.  This allows
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  // for verification that sections of the serialized data are of the
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  // correct length.
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  virtual void do_tag(int tag) = 0;
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};
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#ifdef ASSERT
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// This class is used to flag phases of a collection that
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// can unload classes and which should override the
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// should_remember_klasses() and remember_klass() of OopClosure.
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// The _must_remember_klasses is set in the contructor and restored
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// in the destructor.  _must_remember_klasses is checked in assertions
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// in the OopClosure implementations of should_remember_klasses() and
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// remember_klass() and the expectation is that the OopClosure
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// implementation should not be in use if _must_remember_klasses is set.
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// Instances of RememberKlassesChecker can be place in
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// marking phases of collections which can do class unloading.
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// RememberKlassesChecker can be passed "false" to turn off checking.
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// It is used by CMS when CMS yields to a different collector.
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class RememberKlassesChecker: StackObj {
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 bool _state;
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 bool _skip;
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 public:
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  RememberKlassesChecker(bool checking_on) : _state(false), _skip(false) {
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    _skip = !(ClassUnloading && !UseConcMarkSweepGC ||
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              CMSClassUnloadingEnabled && UseConcMarkSweepGC);
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    if (_skip) {
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      return;
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    }
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    _state = OopClosure::must_remember_klasses();
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    OopClosure::set_must_remember_klasses(checking_on);
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  }
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  ~RememberKlassesChecker() {
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    if (_skip) {
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      return;
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    }
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    OopClosure::set_must_remember_klasses(_state);
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  }
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};
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#endif  // ASSERT