Mercurial > hg > graal-compiler
annotate src/share/vm/oops/fieldInfo.hpp @ 6725:da91efe96a93
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>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 71afdabfd05b |
| children | 4a916f2ce331 |
| rev | line source |
|---|---|
| 3938 | 1 /* |
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2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
| 3938 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef SHARE_VM_OOPS_FIELDINFO_HPP | |
| 26 #define SHARE_VM_OOPS_FIELDINFO_HPP | |
| 27 | |
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28 #include "oops/constantPool.hpp" |
| 3938 | 29 #include "oops/typeArrayOop.hpp" |
| 30 #include "classfile/vmSymbols.hpp" | |
| 31 | |
| 32 // This class represents the field information contained in the fields | |
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33 // array of an InstanceKlass. Currently it's laid on top an array of |
| 3938 | 34 // Java shorts but in the future it could simply be used as a real |
| 35 // array type. FieldInfo generally shouldn't be used directly. | |
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36 // Fields should be queried either through InstanceKlass or through |
| 3938 | 37 // the various FieldStreams. |
| 38 class FieldInfo VALUE_OBJ_CLASS_SPEC { | |
| 39 friend class fieldDescriptor; | |
| 40 friend class JavaFieldStream; | |
| 41 friend class ClassFileParser; | |
| 42 | |
| 43 public: | |
| 44 // fields | |
| 45 // Field info extracted from the class file and stored | |
| 46 // as an array of 7 shorts | |
| 47 enum FieldOffset { | |
| 48 access_flags_offset = 0, | |
| 49 name_index_offset = 1, | |
| 50 signature_index_offset = 2, | |
| 51 initval_index_offset = 3, | |
| 52 low_offset = 4, | |
| 53 high_offset = 5, | |
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54 field_slots = 6 |
| 3938 | 55 }; |
| 56 | |
| 57 private: | |
| 58 u2 _shorts[field_slots]; | |
| 59 | |
| 60 void set_name_index(u2 val) { _shorts[name_index_offset] = val; } | |
| 61 void set_signature_index(u2 val) { _shorts[signature_index_offset] = val; } | |
| 62 void set_initval_index(u2 val) { _shorts[initval_index_offset] = val; } | |
| 63 | |
| 64 u2 name_index() const { return _shorts[name_index_offset]; } | |
| 65 u2 signature_index() const { return _shorts[signature_index_offset]; } | |
| 66 u2 initval_index() const { return _shorts[initval_index_offset]; } | |
| 67 | |
| 68 public: | |
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69 static FieldInfo* from_field_array(Array<u2>* fields, int index) { |
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70 return ((FieldInfo*)fields->adr_at(index * field_slots)); |
| 3938 | 71 } |
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72 static FieldInfo* from_field_array(u2* fields, int index) { |
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73 return ((FieldInfo*)(fields + index * field_slots)); |
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74 } |
| 3938 | 75 |
| 76 void initialize(u2 access_flags, | |
| 77 u2 name_index, | |
| 78 u2 signature_index, | |
| 79 u2 initval_index, | |
| 80 u4 offset) { | |
| 81 _shorts[access_flags_offset] = access_flags; | |
| 82 _shorts[name_index_offset] = name_index; | |
| 83 _shorts[signature_index_offset] = signature_index; | |
| 84 _shorts[initval_index_offset] = initval_index; | |
| 85 set_offset(offset); | |
| 86 } | |
| 87 | |
| 88 u2 access_flags() const { return _shorts[access_flags_offset]; } | |
| 89 u4 offset() const { return build_int_from_shorts(_shorts[low_offset], _shorts[high_offset]); } | |
| 90 | |
| 91 Symbol* name(constantPoolHandle cp) const { | |
| 92 int index = name_index(); | |
| 93 if (is_internal()) { | |
| 94 return lookup_symbol(index); | |
| 95 } | |
| 96 return cp->symbol_at(index); | |
| 97 } | |
| 98 | |
| 99 Symbol* signature(constantPoolHandle cp) const { | |
| 100 int index = signature_index(); | |
| 101 if (is_internal()) { | |
| 102 return lookup_symbol(index); | |
| 103 } | |
| 104 return cp->symbol_at(index); | |
| 105 } | |
| 106 | |
| 107 void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; } | |
| 108 void set_offset(u4 val) { | |
| 109 _shorts[low_offset] = extract_low_short_from_int(val); | |
| 110 _shorts[high_offset] = extract_high_short_from_int(val); | |
| 111 } | |
| 112 | |
| 113 bool is_internal() const { | |
| 114 return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0; | |
| 115 } | |
| 116 | |
| 117 Symbol* lookup_symbol(int symbol_index) const { | |
| 118 assert(is_internal(), "only internal fields"); | |
| 119 return vmSymbols::symbol_at((vmSymbols::SID)symbol_index); | |
| 120 } | |
| 121 }; | |
| 122 | |
| 123 #endif // SHARE_VM_OOPS_FIELDINFO_HPP |