src/hotspot/share/runtime/reflectionUtils.hpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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parent 46380 hotspot/src/share/vm/runtime/reflectionUtils.hpp@4a51438196cf
child 49361 1956d0ec092a
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/*
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 * Copyright (c) 1999, 2017, 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_RUNTIME_REFLECTIONUTILS_HPP
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#define SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP
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#include "memory/allocation.hpp"
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#include "oops/instanceKlass.hpp"
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#include "oops/objArrayOop.hpp"
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#include "oops/oopsHierarchy.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/reflection.hpp"
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#include "utilities/accessFlags.hpp"
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#include "utilities/globalDefinitions.hpp"
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// A KlassStream is an abstract stream for streaming over self, superclasses
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// and (super)interfaces. Streaming is done in reverse order (subclasses first,
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// interfaces last).
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//
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//    for (KlassStream st(k, false, false, false); !st.eos(); st.next()) {
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//      Klass* k = st.klass();
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//      ...
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//    }
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class KlassStream VALUE_OBJ_CLASS_SPEC {
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 protected:
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  InstanceKlass*      _klass;           // current klass/interface iterated over
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  InstanceKlass*      _base_klass;      // initial klass/interface to iterate over
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  Array<Klass*>*      _interfaces;      // transitive interfaces for initial class
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  int                 _interface_index; // current interface being processed
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  bool                _local_only;      // process initial class/interface only
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  bool                _classes_only;    // process classes only (no interfaces)
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  bool                _walk_defaults;   // process default methods
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  bool                _base_class_search_defaults; // time to process default methods
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  bool                _defaults_checked; // already checked for default methods
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  int                 _index;
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  virtual int length() = 0;
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  // constructor
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  KlassStream(InstanceKlass* klass, bool local_only, bool classes_only, bool walk_defaults);
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  // testing
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  bool eos();
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  // iterating
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  virtual void next() = 0;
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  // accessors
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  InstanceKlass* klass() const      { return _klass; }
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  int index() const                 { return _index; }
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  bool base_class_search_defaults() const { return _base_class_search_defaults; }
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  void base_class_search_defaults(bool b) { _base_class_search_defaults = b; }
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};
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// A MethodStream streams over all methods in a class, superclasses and (super)interfaces.
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// Streaming is done in reverse order (subclasses first, methods in reverse order)
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// Usage:
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//
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//    for (MethodStream st(k, false, false); !st.eos(); st.next()) {
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//      Method* m = st.method();
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//      ...
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//    }
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class MethodStream : public KlassStream {
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  int length()                    { return methods()->length(); }
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  Array<Method*>* methods() {
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    if (base_class_search_defaults()) {
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      base_class_search_defaults(false);
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      return _klass->default_methods();
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    } else {
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      return _klass->methods();
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    }
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  }
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  MethodStream(InstanceKlass* klass, bool local_only, bool classes_only)
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    : KlassStream(klass, local_only, classes_only, true) {
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    _index = length();
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    next();
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  }
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  void next() { _index--; }
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  Method* method() { return methods()->at(index()); }
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};
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// A FieldStream streams over all fields in a class, superclasses and (super)interfaces.
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// Streaming is done in reverse order (subclasses first, fields in reverse order)
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// Usage:
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//
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//    for (FieldStream st(k, false, false); !st.eos(); st.next()) {
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//      Symbol* field_name = st.name();
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//      ...
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//    }
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class FieldStream : public KlassStream {
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  int length() { return _klass->java_fields_count(); }
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  fieldDescriptor _fd_buf;
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  FieldStream(InstanceKlass* klass, bool local_only, bool classes_only)
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    : KlassStream(klass, local_only, classes_only, false) {
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    _index = length();
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    next();
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  }
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  void next() { _index -= 1; }
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  // Accessors for current field
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  AccessFlags access_flags() const {
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    AccessFlags flags;
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    flags.set_flags(_klass->field_access_flags(_index));
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    return flags;
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  }
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  Symbol* name() const {
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    return _klass->field_name(_index);
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  }
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  Symbol* signature() const {
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    return _klass->field_signature(_index);
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  }
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  // missing: initval()
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  int offset() const {
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    return _klass->field_offset( index() );
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  }
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  // bridge to a heavier API:
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  fieldDescriptor& field_descriptor() const {
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    fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf);
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    field.reinitialize(_klass, _index);
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    return field;
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  }
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};
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class FilteredField : public CHeapObj<mtInternal>  {
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  Klass* _klass;
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  int    _field_offset;
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  FilteredField(Klass* klass, int field_offset) {
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    _klass = klass;
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    _field_offset = field_offset;
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  }
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  Klass* klass() { return _klass; }
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  int  field_offset() { return _field_offset; }
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};
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class FilteredFieldsMap : AllStatic {
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  static GrowableArray<FilteredField *> *_filtered_fields;
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 public:
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  static void initialize();
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  static bool is_filtered_field(Klass* klass, int field_offset) {
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    for (int i=0; i < _filtered_fields->length(); i++) {
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      if (klass == _filtered_fields->at(i)->klass() &&
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        field_offset == _filtered_fields->at(i)->field_offset()) {
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        return true;
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      }
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    }
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    return false;
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  }
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  static int  filtered_fields_count(Klass* klass, bool local_only) {
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    int nflds = 0;
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    for (int i=0; i < _filtered_fields->length(); i++) {
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      if (local_only && klass == _filtered_fields->at(i)->klass()) {
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        nflds++;
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      } else if (klass->is_subtype_of(_filtered_fields->at(i)->klass())) {
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        nflds++;
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      }
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    }
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    return nflds;
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  }
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};
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// A FilteredFieldStream streams over all fields in a class, superclasses and
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// (super)interfaces. Streaming is done in reverse order (subclasses first,
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// fields in reverse order)
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//
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// Usage:
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//
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//    for (FilteredFieldStream st(k, false, false); !st.eos(); st.next()) {
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//      Symbol* field_name = st.name();
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//      ...
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//    }
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class FilteredFieldStream : public FieldStream {
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 private:
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  int  _filtered_fields_count;
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  bool has_filtered_field() { return (_filtered_fields_count > 0); }
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 public:
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  FilteredFieldStream(InstanceKlass* klass, bool local_only, bool classes_only)
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    : FieldStream(klass, local_only, classes_only) {
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    _filtered_fields_count = FilteredFieldsMap::filtered_fields_count(klass, local_only);
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  }
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  int field_count();
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  void next() {
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    _index -= 1;
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    if (has_filtered_field()) {
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      while (_index >=0 && FilteredFieldsMap::is_filtered_field((Klass*)_klass, offset())) {
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        _index -= 1;
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      }
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    }
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  }
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};
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#endif // SHARE_VM_RUNTIME_REFLECTIONUTILS_HPP