author | jiangli |
Mon, 21 May 2012 14:10:35 -0400 | |
changeset 12772 | d317e5e08194 |
parent 10546 | e79347eebbc5 |
child 13728 | 882756847a04 |
permissions | -rw-r--r-- |
10546 | 1 |
/* |
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* Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_OOPS_FIELDINFO_HPP |
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#define SHARE_VM_OOPS_FIELDINFO_HPP |
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#include "oops/typeArrayOop.hpp" |
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#include "classfile/vmSymbols.hpp" |
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// This class represents the field information contained in the fields |
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// array of an instanceKlass. Currently it's laid on top an array of |
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// Java shorts but in the future it could simply be used as a real |
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// array type. FieldInfo generally shouldn't be used directly. |
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// Fields should be queried either through instanceKlass or through |
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// the various FieldStreams. |
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class FieldInfo VALUE_OBJ_CLASS_SPEC { |
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friend class fieldDescriptor; |
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friend class JavaFieldStream; |
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friend class ClassFileParser; |
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public: |
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// fields |
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// Field info extracted from the class file and stored |
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// as an array of 7 shorts |
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enum FieldOffset { |
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access_flags_offset = 0, |
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name_index_offset = 1, |
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signature_index_offset = 2, |
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initval_index_offset = 3, |
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low_offset = 4, |
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high_offset = 5, |
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12772
d317e5e08194
7168280: Eliminate the generic signature index slot from field array for field without generic signature.
jiangli
parents:
10546
diff
changeset
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field_slots = 6 |
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}; |
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private: |
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u2 _shorts[field_slots]; |
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void set_name_index(u2 val) { _shorts[name_index_offset] = val; } |
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void set_signature_index(u2 val) { _shorts[signature_index_offset] = val; } |
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void set_initval_index(u2 val) { _shorts[initval_index_offset] = val; } |
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u2 name_index() const { return _shorts[name_index_offset]; } |
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u2 signature_index() const { return _shorts[signature_index_offset]; } |
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u2 initval_index() const { return _shorts[initval_index_offset]; } |
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public: |
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static FieldInfo* from_field_array(typeArrayOop fields, int index) { |
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return ((FieldInfo*)fields->short_at_addr(index * field_slots)); |
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} |
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12772
d317e5e08194
7168280: Eliminate the generic signature index slot from field array for field without generic signature.
jiangli
parents:
10546
diff
changeset
|
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static FieldInfo* from_field_array(u2* fields, int index) { |
d317e5e08194
7168280: Eliminate the generic signature index slot from field array for field without generic signature.
jiangli
parents:
10546
diff
changeset
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return ((FieldInfo*)(fields + index * field_slots)); |
d317e5e08194
7168280: Eliminate the generic signature index slot from field array for field without generic signature.
jiangli
parents:
10546
diff
changeset
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} |
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void initialize(u2 access_flags, |
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u2 name_index, |
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u2 signature_index, |
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u2 initval_index, |
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u4 offset) { |
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_shorts[access_flags_offset] = access_flags; |
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_shorts[name_index_offset] = name_index; |
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_shorts[signature_index_offset] = signature_index; |
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_shorts[initval_index_offset] = initval_index; |
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set_offset(offset); |
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} |
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u2 access_flags() const { return _shorts[access_flags_offset]; } |
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u4 offset() const { return build_int_from_shorts(_shorts[low_offset], _shorts[high_offset]); } |
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Symbol* name(constantPoolHandle cp) const { |
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int index = name_index(); |
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if (is_internal()) { |
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return lookup_symbol(index); |
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} |
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return cp->symbol_at(index); |
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} |
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Symbol* signature(constantPoolHandle cp) const { |
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int index = signature_index(); |
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if (is_internal()) { |
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return lookup_symbol(index); |
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} |
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return cp->symbol_at(index); |
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} |
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void set_access_flags(u2 val) { _shorts[access_flags_offset] = val; } |
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void set_offset(u4 val) { |
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_shorts[low_offset] = extract_low_short_from_int(val); |
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_shorts[high_offset] = extract_high_short_from_int(val); |
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} |
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bool is_internal() const { |
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return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0; |
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} |
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Symbol* lookup_symbol(int symbol_index) const { |
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assert(is_internal(), "only internal fields"); |
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return vmSymbols::symbol_at((vmSymbols::SID)symbol_index); |
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} |
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}; |
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#endif // SHARE_VM_OOPS_FIELDINFO_HPP |