Mercurial > hg > truffle
diff src/share/vm/runtime/reflectionUtils.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/runtime/reflectionUtils.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,211 @@ +/* + * Copyright 1999-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +// 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); !st.eos(); st.next()) { +// klassOop k = st.klass(); +// ... +// } + +class KlassStream VALUE_OBJ_CLASS_SPEC { + protected: + instanceKlassHandle _klass; // current klass/interface iterated over + objArrayHandle _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) + int _index; + + virtual int length() const = 0; + + public: + // constructor + KlassStream(instanceKlassHandle klass, bool local_only, bool classes_only); + + // testing + bool eos(); + + // iterating + virtual void next() = 0; + + // accessors + instanceKlassHandle klass() const { return _klass; } + int index() const { return _index; } +}; + + +// 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()) { +// methodOop m = st.method(); +// ... +// } + +class MethodStream : public KlassStream { + private: + int length() const { return methods()->length(); } + objArrayOop methods() const { return _klass->methods(); } + public: + MethodStream(instanceKlassHandle klass, bool local_only, bool classes_only) + : KlassStream(klass, local_only, classes_only) { + _index = length(); + next(); + } + + void next() { _index--; } + methodOop method() const { return methodOop(methods()->obj_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()) { +// symbolOop field_name = st.name(); +// ... +// } + + +class FieldStream : public KlassStream { + private: + int length() const { return fields()->length(); } + constantPoolOop constants() const { return _klass->constants(); } + protected: + typeArrayOop fields() const { return _klass->fields(); } + public: + FieldStream(instanceKlassHandle klass, bool local_only, bool classes_only) + : KlassStream(klass, local_only, classes_only) { + _index = length(); + next(); + } + + void next() { _index -= instanceKlass::next_offset; } + + // Accessors for current field + AccessFlags access_flags() const { + AccessFlags flags; + flags.set_flags(fields()->ushort_at(index() + instanceKlass::access_flags_offset)); + return flags; + } + symbolOop name() const { + int name_index = fields()->ushort_at(index() + instanceKlass::name_index_offset); + return constants()->symbol_at(name_index); + } + symbolOop signature() const { + int signature_index = fields()->ushort_at(index() + + instanceKlass::signature_index_offset); + return constants()->symbol_at(signature_index); + } + // missing: initval() + int offset() const { + return _klass->offset_from_fields( index() ); + } +}; + +class FilteredField { + private: + klassOop _klass; + int _field_offset; + + public: + FilteredField(klassOop klass, int field_offset) { + _klass = klass; + _field_offset = field_offset; + } + klassOop klass() { return _klass; } + oop* klass_addr() { return (oop*) &_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(klassOop 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(klassOop 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->klass_part()->is_subtype_of(_filtered_fields->at(i)->klass())) { + nflds++; + } + } + return nflds; + } + // GC support. + static void klasses_oops_do(OopClosure* f) { + for (int i = 0; i < _filtered_fields->length(); i++) { + f->do_oop((oop*)_filtered_fields->at(i)->klass_addr()); + } + } +}; + + +// 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()) { +// symbolOop 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((klassOop)klass(), local_only); + } + int field_count(); + void next() { + _index -= instanceKlass::next_offset; + if (has_filtered_field()) { + while (_index >=0 && FilteredFieldsMap::is_filtered_field((klassOop)_klass(), offset())) { + _index -= instanceKlass::next_offset; + } + } + } +};