author | stuefe |
Fri, 07 Sep 2018 07:52:35 +0200 | |
branch | stuefe-statistical-history |
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/* |
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* Copyright (c) 1999, 2019, 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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||
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#ifndef SHARE_RUNTIME_REFLECTIONUTILS_HPP |
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#define SHARE_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.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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#include "utilities/growableArray.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 { |
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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<InstanceKlass*>*_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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public: |
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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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private: |
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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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public: |
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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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private: |
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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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public: |
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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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private: |
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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_RUNTIME_REFLECTIONUTILS_HPP |