Mercurial > hg > truffle
annotate src/share/vm/runtime/fieldDescriptor.hpp @ 6176:634b8615a6ba
7177409: Perf regression in JVM_GetClassDeclaredFields after generic signature changes.
Summary: In fieldDescriptor::generic_signature() returns NULL immediately if the field has no generic signature.
Reviewed-by: dholmes, coleenp, jcoomes
| author | jiangli |
|---|---|
| date | Fri, 22 Jun 2012 14:00:39 -0400 |
| parents | 71afdabfd05b |
| children | 1d7922586cf6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP |
| 26 #define SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP | |
| 27 | |
| 28 #include "oops/constantPoolOop.hpp" | |
| 29 #include "oops/klassOop.hpp" | |
| 30 #include "oops/oop.inline.hpp" | |
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31 #include "oops/symbol.hpp" |
| 1972 | 32 #include "runtime/fieldType.hpp" |
| 33 #include "utilities/accessFlags.hpp" | |
| 34 #include "utilities/constantTag.hpp" | |
| 35 | |
| 0 | 36 // A fieldDescriptor describes the attributes of a single field (instance or class variable). |
| 37 // It needs the class constant pool to work (because it only holds indices into the pool | |
| 38 // rather than the actual info). | |
| 39 | |
| 40 class fieldDescriptor VALUE_OBJ_CLASS_SPEC { | |
| 41 private: | |
| 42 AccessFlags _access_flags; | |
| 3938 | 43 int _index; // the field index |
| 0 | 44 constantPoolHandle _cp; |
| 45 | |
| 3938 | 46 // update the access_flags for the field in the klass |
| 47 void update_klass_field_access_flag() { | |
| 48 instanceKlass* ik = instanceKlass::cast(field_holder()); | |
| 49 ik->field(index())->set_access_flags(_access_flags.as_short()); | |
| 50 } | |
| 51 | |
| 52 FieldInfo* field() const { | |
| 53 instanceKlass* ik = instanceKlass::cast(field_holder()); | |
| 54 return ik->field(_index); | |
| 55 } | |
| 56 | |
| 0 | 57 public: |
| 3938 | 58 Symbol* name() const { |
| 59 return field()->name(_cp); | |
| 60 } | |
| 61 Symbol* signature() const { | |
| 62 return field()->signature(_cp); | |
| 63 } | |
| 0 | 64 klassOop field_holder() const { return _cp->pool_holder(); } |
| 65 constantPoolOop constants() const { return _cp(); } | |
| 66 AccessFlags access_flags() const { return _access_flags; } | |
| 67 oop loader() const; | |
| 68 // Offset (in words) of field from start of instanceOop / klassOop | |
| 3938 | 69 int offset() const { return field()->offset(); } |
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70 Symbol* generic_signature() const; |
| 0 | 71 int index() const { return _index; } |
| 72 typeArrayOop annotations() const; | |
| 73 | |
| 74 // Initial field value | |
| 3938 | 75 bool has_initial_value() const { return field()->initval_index() != 0; } |
| 76 int initial_value_index() const { return field()->initval_index(); } | |
| 0 | 77 constantTag initial_value_tag() const; // The tag will return true on one of is_int(), is_long(), is_single(), is_double() |
| 78 jint int_initial_value() const; | |
| 79 jlong long_initial_value() const; | |
| 80 jfloat float_initial_value() const; | |
| 81 jdouble double_initial_value() const; | |
| 82 oop string_initial_value(TRAPS) const; | |
| 83 | |
| 84 // Field signature type | |
| 85 BasicType field_type() const { return FieldType::basic_type(signature()); } | |
| 86 | |
| 87 // Access flags | |
| 3938 | 88 bool is_public() const { return access_flags().is_public(); } |
| 89 bool is_private() const { return access_flags().is_private(); } | |
| 90 bool is_protected() const { return access_flags().is_protected(); } | |
| 0 | 91 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } |
| 92 | |
| 3938 | 93 bool is_static() const { return access_flags().is_static(); } |
| 94 bool is_final() const { return access_flags().is_final(); } | |
| 95 bool is_volatile() const { return access_flags().is_volatile(); } | |
| 96 bool is_transient() const { return access_flags().is_transient(); } | |
| 0 | 97 |
| 3938 | 98 bool is_synthetic() const { return access_flags().is_synthetic(); } |
| 0 | 99 |
| 3938 | 100 bool is_field_access_watched() const { return access_flags().is_field_access_watched(); } |
| 0 | 101 bool is_field_modification_watched() const |
| 3938 | 102 { return access_flags().is_field_modification_watched(); } |
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7177409: Perf regression in JVM_GetClassDeclaredFields after generic signature changes.
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103 bool has_generic_signature() const { return access_flags().field_has_generic_signature(); } |
| 3938 | 104 |
| 105 void set_is_field_access_watched(const bool value) { | |
| 106 _access_flags.set_is_field_access_watched(value); | |
| 107 update_klass_field_access_flag(); | |
| 108 } | |
| 109 | |
| 110 void set_is_field_modification_watched(const bool value) { | |
| 111 _access_flags.set_is_field_modification_watched(value); | |
| 112 update_klass_field_access_flag(); | |
| 113 } | |
| 0 | 114 |
| 115 // Initialization | |
| 116 void initialize(klassOop k, int index); | |
| 117 | |
| 118 // Print | |
| 119 void print_on(outputStream* st) const PRODUCT_RETURN; | |
| 120 void print_on_for(outputStream* st, oop obj) PRODUCT_RETURN; | |
| 121 }; | |
| 1972 | 122 |
| 123 #endif // SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP |