Sat, 01 Sep 2012 13:25:18 -0400
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
never@3137 | 1 | /* |
coleenp@4037 | 2 | * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
never@3137 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
never@3137 | 4 | * |
never@3137 | 5 | * This code is free software; you can redistribute it and/or modify it |
never@3137 | 6 | * under the terms of the GNU General Public License version 2 only, as |
never@3137 | 7 | * published by the Free Software Foundation. |
never@3137 | 8 | * |
never@3137 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
never@3137 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
never@3137 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
never@3137 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
never@3137 | 13 | * accompanied this code). |
never@3137 | 14 | * |
never@3137 | 15 | * You should have received a copy of the GNU General Public License version |
never@3137 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
never@3137 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
never@3137 | 18 | * |
never@3137 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
never@3137 | 20 | * or visit www.oracle.com if you need additional information or have any |
never@3137 | 21 | * questions. |
never@3137 | 22 | * |
never@3137 | 23 | */ |
never@3137 | 24 | |
never@3137 | 25 | #ifndef SHARE_VM_OOPS_FIELDINFO_HPP |
never@3137 | 26 | #define SHARE_VM_OOPS_FIELDINFO_HPP |
never@3137 | 27 | |
coleenp@4037 | 28 | #include "oops/constantPool.hpp" |
never@3137 | 29 | #include "oops/typeArrayOop.hpp" |
never@3137 | 30 | #include "classfile/vmSymbols.hpp" |
never@3137 | 31 | |
never@3137 | 32 | // This class represents the field information contained in the fields |
coleenp@4037 | 33 | // array of an InstanceKlass. Currently it's laid on top an array of |
never@3137 | 34 | // Java shorts but in the future it could simply be used as a real |
never@3137 | 35 | // array type. FieldInfo generally shouldn't be used directly. |
coleenp@4037 | 36 | // Fields should be queried either through InstanceKlass or through |
never@3137 | 37 | // the various FieldStreams. |
never@3137 | 38 | class FieldInfo VALUE_OBJ_CLASS_SPEC { |
never@3137 | 39 | friend class fieldDescriptor; |
never@3137 | 40 | friend class JavaFieldStream; |
never@3137 | 41 | friend class ClassFileParser; |
never@3137 | 42 | |
never@3137 | 43 | public: |
never@3137 | 44 | // fields |
never@3137 | 45 | // Field info extracted from the class file and stored |
never@3137 | 46 | // as an array of 7 shorts |
never@3137 | 47 | enum FieldOffset { |
never@3137 | 48 | access_flags_offset = 0, |
never@3137 | 49 | name_index_offset = 1, |
never@3137 | 50 | signature_index_offset = 2, |
never@3137 | 51 | initval_index_offset = 3, |
never@3137 | 52 | low_offset = 4, |
never@3137 | 53 | high_offset = 5, |
jiangli@3803 | 54 | field_slots = 6 |
never@3137 | 55 | }; |
never@3137 | 56 | |
never@3137 | 57 | private: |
never@3137 | 58 | u2 _shorts[field_slots]; |
never@3137 | 59 | |
never@3137 | 60 | void set_name_index(u2 val) { _shorts[name_index_offset] = val; } |
never@3137 | 61 | void set_signature_index(u2 val) { _shorts[signature_index_offset] = val; } |
never@3137 | 62 | void set_initval_index(u2 val) { _shorts[initval_index_offset] = val; } |
never@3137 | 63 | |
never@3137 | 64 | u2 name_index() const { return _shorts[name_index_offset]; } |
never@3137 | 65 | u2 signature_index() const { return _shorts[signature_index_offset]; } |
never@3137 | 66 | u2 initval_index() const { return _shorts[initval_index_offset]; } |
never@3137 | 67 | |
never@3137 | 68 | public: |
coleenp@4037 | 69 | static FieldInfo* from_field_array(Array<u2>* fields, int index) { |
coleenp@4037 | 70 | return ((FieldInfo*)fields->adr_at(index * field_slots)); |
never@3137 | 71 | } |
jiangli@3803 | 72 | static FieldInfo* from_field_array(u2* fields, int index) { |
jiangli@3803 | 73 | return ((FieldInfo*)(fields + index * field_slots)); |
jiangli@3803 | 74 | } |
never@3137 | 75 | |
never@3137 | 76 | void initialize(u2 access_flags, |
never@3137 | 77 | u2 name_index, |
never@3137 | 78 | u2 signature_index, |
never@3137 | 79 | u2 initval_index, |
never@3137 | 80 | u4 offset) { |
never@3137 | 81 | _shorts[access_flags_offset] = access_flags; |
never@3137 | 82 | _shorts[name_index_offset] = name_index; |
never@3137 | 83 | _shorts[signature_index_offset] = signature_index; |
never@3137 | 84 | _shorts[initval_index_offset] = initval_index; |
never@3137 | 85 | set_offset(offset); |
never@3137 | 86 | } |
never@3137 | 87 | |
never@3137 | 88 | u2 access_flags() const { return _shorts[access_flags_offset]; } |
never@3137 | 89 | u4 offset() const { return build_int_from_shorts(_shorts[low_offset], _shorts[high_offset]); } |
never@3137 | 90 | |
never@3137 | 91 | Symbol* name(constantPoolHandle cp) const { |
never@3137 | 92 | int index = name_index(); |
never@3137 | 93 | if (is_internal()) { |
never@3137 | 94 | return lookup_symbol(index); |
never@3137 | 95 | } |
never@3137 | 96 | return cp->symbol_at(index); |
never@3137 | 97 | } |
never@3137 | 98 | |
never@3137 | 99 | Symbol* signature(constantPoolHandle cp) const { |
never@3137 | 100 | int index = signature_index(); |
never@3137 | 101 | if (is_internal()) { |
never@3137 | 102 | return lookup_symbol(index); |
never@3137 | 103 | } |
never@3137 | 104 | return cp->symbol_at(index); |
never@3137 | 105 | } |
never@3137 | 106 | |
never@3137 | 107 | void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; } |
never@3137 | 108 | void set_offset(u4 val) { |
never@3137 | 109 | _shorts[low_offset] = extract_low_short_from_int(val); |
never@3137 | 110 | _shorts[high_offset] = extract_high_short_from_int(val); |
never@3137 | 111 | } |
never@3137 | 112 | |
never@3137 | 113 | bool is_internal() const { |
never@3137 | 114 | return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0; |
never@3137 | 115 | } |
never@3137 | 116 | |
never@3137 | 117 | Symbol* lookup_symbol(int symbol_index) const { |
never@3137 | 118 | assert(is_internal(), "only internal fields"); |
never@3137 | 119 | return vmSymbols::symbol_at((vmSymbols::SID)symbol_index); |
never@3137 | 120 | } |
never@3137 | 121 | }; |
never@3137 | 122 | |
never@3137 | 123 | #endif // SHARE_VM_OOPS_FIELDINFO_HPP |