Thu, 27 May 2010 18:01:56 -0700
6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb
Summary: Added new product ObjectAlignmentInBytes flag to control object alignment.
Reviewed-by: twisti, ysr, iveresov
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1999-2005 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | // A KlassStream is an abstract stream for streaming over self, superclasses |
duke@435 | 26 | // and (super)interfaces. Streaming is done in reverse order (subclasses first, |
duke@435 | 27 | // interfaces last). |
duke@435 | 28 | // |
duke@435 | 29 | // for (KlassStream st(k, false, false); !st.eos(); st.next()) { |
duke@435 | 30 | // klassOop k = st.klass(); |
duke@435 | 31 | // ... |
duke@435 | 32 | // } |
duke@435 | 33 | |
duke@435 | 34 | class KlassStream VALUE_OBJ_CLASS_SPEC { |
duke@435 | 35 | protected: |
duke@435 | 36 | instanceKlassHandle _klass; // current klass/interface iterated over |
duke@435 | 37 | objArrayHandle _interfaces; // transitive interfaces for initial class |
duke@435 | 38 | int _interface_index; // current interface being processed |
duke@435 | 39 | bool _local_only; // process initial class/interface only |
duke@435 | 40 | bool _classes_only; // process classes only (no interfaces) |
duke@435 | 41 | int _index; |
duke@435 | 42 | |
duke@435 | 43 | virtual int length() const = 0; |
duke@435 | 44 | |
duke@435 | 45 | public: |
duke@435 | 46 | // constructor |
duke@435 | 47 | KlassStream(instanceKlassHandle klass, bool local_only, bool classes_only); |
duke@435 | 48 | |
duke@435 | 49 | // testing |
duke@435 | 50 | bool eos(); |
duke@435 | 51 | |
duke@435 | 52 | // iterating |
duke@435 | 53 | virtual void next() = 0; |
duke@435 | 54 | |
duke@435 | 55 | // accessors |
duke@435 | 56 | instanceKlassHandle klass() const { return _klass; } |
duke@435 | 57 | int index() const { return _index; } |
duke@435 | 58 | }; |
duke@435 | 59 | |
duke@435 | 60 | |
duke@435 | 61 | // A MethodStream streams over all methods in a class, superclasses and (super)interfaces. |
duke@435 | 62 | // Streaming is done in reverse order (subclasses first, methods in reverse order) |
duke@435 | 63 | // Usage: |
duke@435 | 64 | // |
duke@435 | 65 | // for (MethodStream st(k, false, false); !st.eos(); st.next()) { |
duke@435 | 66 | // methodOop m = st.method(); |
duke@435 | 67 | // ... |
duke@435 | 68 | // } |
duke@435 | 69 | |
duke@435 | 70 | class MethodStream : public KlassStream { |
duke@435 | 71 | private: |
duke@435 | 72 | int length() const { return methods()->length(); } |
duke@435 | 73 | objArrayOop methods() const { return _klass->methods(); } |
duke@435 | 74 | public: |
duke@435 | 75 | MethodStream(instanceKlassHandle klass, bool local_only, bool classes_only) |
duke@435 | 76 | : KlassStream(klass, local_only, classes_only) { |
duke@435 | 77 | _index = length(); |
duke@435 | 78 | next(); |
duke@435 | 79 | } |
duke@435 | 80 | |
duke@435 | 81 | void next() { _index--; } |
duke@435 | 82 | methodOop method() const { return methodOop(methods()->obj_at(index())); } |
duke@435 | 83 | }; |
duke@435 | 84 | |
duke@435 | 85 | |
duke@435 | 86 | // A FieldStream streams over all fields in a class, superclasses and (super)interfaces. |
duke@435 | 87 | // Streaming is done in reverse order (subclasses first, fields in reverse order) |
duke@435 | 88 | // Usage: |
duke@435 | 89 | // |
duke@435 | 90 | // for (FieldStream st(k, false, false); !st.eos(); st.next()) { |
duke@435 | 91 | // symbolOop field_name = st.name(); |
duke@435 | 92 | // ... |
duke@435 | 93 | // } |
duke@435 | 94 | |
duke@435 | 95 | |
duke@435 | 96 | class FieldStream : public KlassStream { |
duke@435 | 97 | private: |
duke@435 | 98 | int length() const { return fields()->length(); } |
duke@435 | 99 | constantPoolOop constants() const { return _klass->constants(); } |
duke@435 | 100 | protected: |
duke@435 | 101 | typeArrayOop fields() const { return _klass->fields(); } |
duke@435 | 102 | public: |
duke@435 | 103 | FieldStream(instanceKlassHandle klass, bool local_only, bool classes_only) |
duke@435 | 104 | : KlassStream(klass, local_only, classes_only) { |
duke@435 | 105 | _index = length(); |
duke@435 | 106 | next(); |
duke@435 | 107 | } |
duke@435 | 108 | |
duke@435 | 109 | void next() { _index -= instanceKlass::next_offset; } |
duke@435 | 110 | |
duke@435 | 111 | // Accessors for current field |
duke@435 | 112 | AccessFlags access_flags() const { |
duke@435 | 113 | AccessFlags flags; |
duke@435 | 114 | flags.set_flags(fields()->ushort_at(index() + instanceKlass::access_flags_offset)); |
duke@435 | 115 | return flags; |
duke@435 | 116 | } |
duke@435 | 117 | symbolOop name() const { |
duke@435 | 118 | int name_index = fields()->ushort_at(index() + instanceKlass::name_index_offset); |
duke@435 | 119 | return constants()->symbol_at(name_index); |
duke@435 | 120 | } |
duke@435 | 121 | symbolOop signature() const { |
duke@435 | 122 | int signature_index = fields()->ushort_at(index() + |
duke@435 | 123 | instanceKlass::signature_index_offset); |
duke@435 | 124 | return constants()->symbol_at(signature_index); |
duke@435 | 125 | } |
duke@435 | 126 | // missing: initval() |
duke@435 | 127 | int offset() const { |
duke@435 | 128 | return _klass->offset_from_fields( index() ); |
duke@435 | 129 | } |
duke@435 | 130 | }; |
duke@435 | 131 | |
duke@435 | 132 | class FilteredField { |
duke@435 | 133 | private: |
duke@435 | 134 | klassOop _klass; |
duke@435 | 135 | int _field_offset; |
duke@435 | 136 | |
duke@435 | 137 | public: |
duke@435 | 138 | FilteredField(klassOop klass, int field_offset) { |
duke@435 | 139 | _klass = klass; |
duke@435 | 140 | _field_offset = field_offset; |
duke@435 | 141 | } |
duke@435 | 142 | klassOop klass() { return _klass; } |
duke@435 | 143 | oop* klass_addr() { return (oop*) &_klass; } |
duke@435 | 144 | int field_offset() { return _field_offset; } |
duke@435 | 145 | }; |
duke@435 | 146 | |
duke@435 | 147 | class FilteredFieldsMap : AllStatic { |
duke@435 | 148 | private: |
duke@435 | 149 | static GrowableArray<FilteredField *> *_filtered_fields; |
duke@435 | 150 | public: |
duke@435 | 151 | static void initialize(); |
duke@435 | 152 | static bool is_filtered_field(klassOop klass, int field_offset) { |
duke@435 | 153 | for (int i=0; i < _filtered_fields->length(); i++) { |
duke@435 | 154 | if (klass == _filtered_fields->at(i)->klass() && |
duke@435 | 155 | field_offset == _filtered_fields->at(i)->field_offset()) { |
duke@435 | 156 | return true; |
duke@435 | 157 | } |
duke@435 | 158 | } |
duke@435 | 159 | return false; |
duke@435 | 160 | } |
duke@435 | 161 | static int filtered_fields_count(klassOop klass, bool local_only) { |
duke@435 | 162 | int nflds = 0; |
duke@435 | 163 | for (int i=0; i < _filtered_fields->length(); i++) { |
duke@435 | 164 | if (local_only && klass == _filtered_fields->at(i)->klass()) { |
duke@435 | 165 | nflds++; |
duke@435 | 166 | } else if (klass->klass_part()->is_subtype_of(_filtered_fields->at(i)->klass())) { |
duke@435 | 167 | nflds++; |
duke@435 | 168 | } |
duke@435 | 169 | } |
duke@435 | 170 | return nflds; |
duke@435 | 171 | } |
duke@435 | 172 | // GC support. |
duke@435 | 173 | static void klasses_oops_do(OopClosure* f) { |
duke@435 | 174 | for (int i = 0; i < _filtered_fields->length(); i++) { |
duke@435 | 175 | f->do_oop((oop*)_filtered_fields->at(i)->klass_addr()); |
duke@435 | 176 | } |
duke@435 | 177 | } |
duke@435 | 178 | }; |
duke@435 | 179 | |
duke@435 | 180 | |
duke@435 | 181 | // A FilteredFieldStream streams over all fields in a class, superclasses and |
duke@435 | 182 | // (super)interfaces. Streaming is done in reverse order (subclasses first, |
duke@435 | 183 | // fields in reverse order) |
duke@435 | 184 | // |
duke@435 | 185 | // Usage: |
duke@435 | 186 | // |
duke@435 | 187 | // for (FilteredFieldStream st(k, false, false); !st.eos(); st.next()) { |
duke@435 | 188 | // symbolOop field_name = st.name(); |
duke@435 | 189 | // ... |
duke@435 | 190 | // } |
duke@435 | 191 | |
duke@435 | 192 | class FilteredFieldStream : public FieldStream { |
duke@435 | 193 | private: |
duke@435 | 194 | int _filtered_fields_count; |
duke@435 | 195 | bool has_filtered_field() { return (_filtered_fields_count > 0); } |
duke@435 | 196 | |
duke@435 | 197 | public: |
duke@435 | 198 | FilteredFieldStream(instanceKlassHandle klass, bool local_only, bool classes_only) |
duke@435 | 199 | : FieldStream(klass, local_only, classes_only) { |
duke@435 | 200 | _filtered_fields_count = FilteredFieldsMap::filtered_fields_count((klassOop)klass(), local_only); |
duke@435 | 201 | } |
duke@435 | 202 | int field_count(); |
duke@435 | 203 | void next() { |
duke@435 | 204 | _index -= instanceKlass::next_offset; |
duke@435 | 205 | if (has_filtered_field()) { |
duke@435 | 206 | while (_index >=0 && FilteredFieldsMap::is_filtered_field((klassOop)_klass(), offset())) { |
duke@435 | 207 | _index -= instanceKlass::next_offset; |
duke@435 | 208 | } |
duke@435 | 209 | } |
duke@435 | 210 | } |
duke@435 | 211 | }; |