jdk8-mips64-public/hotspot: src/share/vm/runtime/reflectionUtils.hpp@72053ed6f8d4 (annotated)

src/share/vm/runtime/reflectionUtils.hpp@72053ed6f8d4 (annotated)

src/share/vm/runtime/reflectionUtils.hpp

Thu, 24 Nov 2016 11:27:57 +0100

author: tschatzl
date: Thu, 24 Nov 2016 11:27:57 +0100
changeset 9982: 72053ed6f8d4
parent 5848: ac9cb1d5a202
child 6876: 710a3c8b516e
permissions: -rw-r--r--

8057003: Large reference arrays cause extremely long synchronization times
Summary: Slice large object arrays into parts so that the synchronization of marking threads with an STW pause request does not take long.
Reviewed-by: ehelin, pliden
Contributed-by: maoliang.ml@alibaba-inc.com

 /*
  * Copyright (c) 1999, 2013, 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.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP
 #define SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP
 #include "memory/allocation.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/objArrayOop.hpp"
 #include "oops/oopsHierarchy.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/reflection.hpp"
 #include "utilities/accessFlags.hpp"
 #include "utilities/globalDefinitions.hpp"
 // A KlassStream is an abstract stream for streaming over self, superclasses
 // and (super)interfaces. Streaming is done in reverse order (subclasses first,
 // interfaces last).
 //
 //    for (KlassStream st(k, false, false, false); !st.eos(); st.next()) {
 //      Klass* k = st.klass();
 //      ...
 //    }
 class KlassStream VALUE_OBJ_CLASS_SPEC {
  protected:
   instanceKlassHandle _klass;           // current klass/interface iterated over
   instanceKlassHandle _base_klass;      // initial klass/interface to iterate over
   Array<Klass*>*      _interfaces;      // transitive interfaces for initial class
   int                 _interface_index; // current interface being processed
   bool                _local_only;      // process initial class/interface only
   bool                _classes_only;    // process classes only (no interfaces)
   bool                _walk_defaults;   // process default methods
   bool                _base_class_search_defaults; // time to process default methods
   bool                _defaults_checked; // already checked for default methods
   int                 _index;
   virtual int length() = 0;
  public:
   // constructor
   KlassStream(instanceKlassHandle klass, bool local_only, bool classes_only, bool walk_defaults);
   // testing
   bool eos();
   // iterating
   virtual void next() = 0;
   // accessors
   instanceKlassHandle klass() const { return _klass; }
   int index() const                 { return _index; }
   bool base_class_search_defaults() const { return _base_class_search_defaults; }
   void base_class_search_defaults(bool b) { _base_class_search_defaults = b; }
 };
 // A MethodStream streams over all methods in a class, superclasses and (super)interfaces.
 // Streaming is done in reverse order (subclasses first, methods in reverse order)
 // Usage:
 //
 //    for (MethodStream st(k, false, false); !st.eos(); st.next()) {
 //      Method* m = st.method();
 //      ...
 //    }
 class MethodStream : public KlassStream {
  private:
   int length()                    { return methods()->length(); }
   Array<Method*>* methods() {
     if (base_class_search_defaults()) {
       base_class_search_defaults(false);
       return _klass->default_methods();
     } else {
       return _klass->methods();
     }
   }
  public:
   MethodStream(instanceKlassHandle klass, bool local_only, bool classes_only)
     : KlassStream(klass, local_only, classes_only, true) {
     _index = length();
     next();
   }
   void next() { _index--; }
   Method* method() { return methods()->at(index()); }
 };
 // A FieldStream streams over all fields in a class, superclasses and (super)interfaces.
 // Streaming is done in reverse order (subclasses first, fields in reverse order)
 // Usage:
 //
 //    for (FieldStream st(k, false, false); !st.eos(); st.next()) {
 //      Symbol* field_name = st.name();
 //      ...
 //    }
 class FieldStream : public KlassStream {
  private:
   int length() { return _klass->java_fields_count(); }
   fieldDescriptor _fd_buf;
  public:
   FieldStream(instanceKlassHandle klass, bool local_only, bool classes_only)
     : KlassStream(klass, local_only, classes_only, false) {
     _index = length();
     next();
   }
   void next() { _index -= 1; }
   // Accessors for current field
   AccessFlags access_flags() const {
     AccessFlags flags;
     flags.set_flags(_klass->field_access_flags(_index));
     return flags;
   }
   Symbol* name() const {
     return _klass->field_name(_index);
   }
   Symbol* signature() const {
     return _klass->field_signature(_index);
   }
   // missing: initval()
   int offset() const {
     return _klass->field_offset( index() );
   }
   // bridge to a heavier API:
   fieldDescriptor& field_descriptor() const {
     fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf);
     field.reinitialize(_klass(), _index);
     return field;
   }
 };
 class FilteredField : public CHeapObj<mtInternal>  {
  private:
   Klass* _klass;
   int    _field_offset;
  public:
   FilteredField(Klass* klass, int field_offset) {
     _klass = klass;
     _field_offset = field_offset;
   }
   Klass* klass() { return _klass; }
   int  field_offset() { return _field_offset; }
 };
 class FilteredFieldsMap : AllStatic {
  private:
   static GrowableArray<FilteredField *> *_filtered_fields;
  public:
   static void initialize();
   static bool is_filtered_field(Klass* klass, int field_offset) {
     for (int i=0; i < _filtered_fields->length(); i++) {
       if (klass == _filtered_fields->at(i)->klass() &&
         field_offset == _filtered_fields->at(i)->field_offset()) {
         return true;
       }
     }
     return false;
   }
   static int  filtered_fields_count(Klass* klass, bool local_only) {
     int nflds = 0;
     for (int i=0; i < _filtered_fields->length(); i++) {
       if (local_only && klass == _filtered_fields->at(i)->klass()) {
         nflds++;
       } else if (klass->is_subtype_of(_filtered_fields->at(i)->klass())) {
         nflds++;
       }
     }
     return nflds;
   }
   // Enhance Class Redefinition Support
   static void classes_do(KlassClosure* f) {
     for (int i = 0; i < _filtered_fields->length(); i++) {
       f->do_klass(_filtered_fields->at(i)->klass());
     }
   }
 };
 // A FilteredFieldStream streams over all fields in a class, superclasses and
 // (super)interfaces. Streaming is done in reverse order (subclasses first,
 // fields in reverse order)
 //
 // Usage:
 //
 //    for (FilteredFieldStream st(k, false, false); !st.eos(); st.next()) {
 //      Symbol* field_name = st.name();
 //      ...
 //    }
 class FilteredFieldStream : public FieldStream {
  private:
   int  _filtered_fields_count;
   bool has_filtered_field() { return (_filtered_fields_count > 0); }
  public:
   FilteredFieldStream(instanceKlassHandle klass, bool local_only, bool classes_only)
     : FieldStream(klass, local_only, classes_only) {
     _filtered_fields_count = FilteredFieldsMap::filtered_fields_count((Klass*)klass(), local_only);
   }
   int field_count();
   void next() {
     _index -= 1;
     if (has_filtered_field()) {
       while (_index >=0 && FilteredFieldsMap::is_filtered_field((Klass*)_klass(), offset())) {
         _index -= 1;
       }
     }
   }
 };
 #endif // SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/reflectionUtils.hpp@72053ed6f8d4 (annotated)

src/share/vm/runtime/reflectionUtils.hpp