Mercurial > hg > graal-jvmci-8
annotate src/share/vm/oops/fieldInfo.hpp @ 6100:71afdabfd05b
7168280: Eliminate the generic signature index slot from field array for field without generic signature.
Summary: Only allocate the generic signature index slot in the field array for field with generic signature attribute.
Reviewed-by: coleenp, dlong
author | jiangli |
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date | Mon, 21 May 2012 14:10:35 -0400 |
parents | e6b1331a51d2 |
children | da91efe96a93 |
rev | line source |
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3938 | 1 /* |
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. | |
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 | |
28 #include "oops/typeArrayOop.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 | |
31 // This class represents the field information contained in the fields | |
32 // array of an instanceKlass. Currently it's laid on top an array of | |
33 // Java shorts but in the future it could simply be used as a real | |
34 // array type. FieldInfo generally shouldn't be used directly. | |
35 // Fields should be queried either through instanceKlass or through | |
36 // the various FieldStreams. | |
37 class FieldInfo VALUE_OBJ_CLASS_SPEC { | |
38 friend class fieldDescriptor; | |
39 friend class JavaFieldStream; | |
40 friend class ClassFileParser; | |
41 | |
42 public: | |
43 // fields | |
44 // Field info extracted from the class file and stored | |
45 // as an array of 7 shorts | |
46 enum FieldOffset { | |
47 access_flags_offset = 0, | |
48 name_index_offset = 1, | |
49 signature_index_offset = 2, | |
50 initval_index_offset = 3, | |
51 low_offset = 4, | |
52 high_offset = 5, | |
6100
71afdabfd05b
7168280: Eliminate the generic signature index slot from field array for field without generic signature.
jiangli
parents:
3938
diff
changeset
|
53 field_slots = 6 |
3938 | 54 }; |
55 | |
56 private: | |
57 u2 _shorts[field_slots]; | |
58 | |
59 void set_name_index(u2 val) { _shorts[name_index_offset] = val; } | |
60 void set_signature_index(u2 val) { _shorts[signature_index_offset] = val; } | |
61 void set_initval_index(u2 val) { _shorts[initval_index_offset] = val; } | |
62 | |
63 u2 name_index() const { return _shorts[name_index_offset]; } | |
64 u2 signature_index() const { return _shorts[signature_index_offset]; } | |
65 u2 initval_index() const { return _shorts[initval_index_offset]; } | |
66 | |
67 public: | |
68 static FieldInfo* from_field_array(typeArrayOop fields, int index) { | |
69 return ((FieldInfo*)fields->short_at_addr(index * field_slots)); | |
70 } | |
6100
71afdabfd05b
7168280: Eliminate the generic signature index slot from field array for field without generic signature.
jiangli
parents:
3938
diff
changeset
|
71 static FieldInfo* from_field_array(u2* fields, int index) { |
71afdabfd05b
7168280: Eliminate the generic signature index slot from field array for field without generic signature.
jiangli
parents:
3938
diff
changeset
|
72 return ((FieldInfo*)(fields + index * field_slots)); |
71afdabfd05b
7168280: Eliminate the generic signature index slot from field array for field without generic signature.
jiangli
parents:
3938
diff
changeset
|
73 } |
3938 | 74 |
75 void initialize(u2 access_flags, | |
76 u2 name_index, | |
77 u2 signature_index, | |
78 u2 initval_index, | |
79 u4 offset) { | |
80 _shorts[access_flags_offset] = access_flags; | |
81 _shorts[name_index_offset] = name_index; | |
82 _shorts[signature_index_offset] = signature_index; | |
83 _shorts[initval_index_offset] = initval_index; | |
84 set_offset(offset); | |
85 } | |
86 | |
87 u2 access_flags() const { return _shorts[access_flags_offset]; } | |
88 u4 offset() const { return build_int_from_shorts(_shorts[low_offset], _shorts[high_offset]); } | |
89 | |
90 Symbol* name(constantPoolHandle cp) const { | |
91 int index = name_index(); | |
92 if (is_internal()) { | |
93 return lookup_symbol(index); | |
94 } | |
95 return cp->symbol_at(index); | |
96 } | |
97 | |
98 Symbol* signature(constantPoolHandle cp) const { | |
99 int index = signature_index(); | |
100 if (is_internal()) { | |
101 return lookup_symbol(index); | |
102 } | |
103 return cp->symbol_at(index); | |
104 } | |
105 | |
106 void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; } | |
107 void set_offset(u4 val) { | |
108 _shorts[low_offset] = extract_low_short_from_int(val); | |
109 _shorts[high_offset] = extract_high_short_from_int(val); | |
110 } | |
111 | |
112 bool is_internal() const { | |
113 return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0; | |
114 } | |
115 | |
116 Symbol* lookup_symbol(int symbol_index) const { | |
117 assert(is_internal(), "only internal fields"); | |
118 return vmSymbols::symbol_at((vmSymbols::SID)symbol_index); | |
119 } | |
120 }; | |
121 | |
122 #endif // SHARE_VM_OOPS_FIELDINFO_HPP |