Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/fieldDescriptor.hpp @ 3979:4dfb2df418f2
6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
| author | johnc |
|---|---|
| date | Thu, 22 Sep 2011 10:57:37 -0700 |
| parents | e6b1331a51d2 |
| children | 04b9a2566eec 71afdabfd05b |
| 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(); } |
| 70 Symbol* generic_signature() const { return field()->generic_signature(_cp); } | |
| 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(); } |
| 103 | |
| 104 void set_is_field_access_watched(const bool value) { | |
| 105 _access_flags.set_is_field_access_watched(value); | |
| 106 update_klass_field_access_flag(); | |
| 107 } | |
| 108 | |
| 109 void set_is_field_modification_watched(const bool value) { | |
| 110 _access_flags.set_is_field_modification_watched(value); | |
| 111 update_klass_field_access_flag(); | |
| 112 } | |
| 0 | 113 |
| 114 // Initialization | |
| 115 void initialize(klassOop k, int index); | |
| 116 | |
| 117 // Print | |
| 118 void print_on(outputStream* st) const PRODUCT_RETURN; | |
| 119 void print_on_for(outputStream* st, oop obj) PRODUCT_RETURN; | |
| 120 }; | |
| 1972 | 121 |
| 122 #endif // SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP |