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/*
* Copyright (c) 1999, 2005, 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.
*
*/
// 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;
}
}
}
};
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