| /* |
| * Copyright (c) 1999, 2017, 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: |
| InstanceKlass* _klass; // current klass/interface iterated over |
| InstanceKlass* _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(InstanceKlass* klass, bool local_only, bool classes_only, bool walk_defaults); |
| |
| // testing |
| bool eos(); |
| |
| // iterating |
| virtual void next() = 0; |
| |
| // accessors |
| InstanceKlass* 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(InstanceKlass* 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(InstanceKlass* 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; |
| } |
| }; |
| |
| |
| // 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(InstanceKlass* klass, bool local_only, bool classes_only) |
| : FieldStream(klass, local_only, classes_only) { |
| _filtered_fields_count = FilteredFieldsMap::filtered_fields_count(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 |