author | coleenp |
Fri, 23 Feb 2018 07:47:29 -0500 | |
changeset 49056 | 91ada5977172 |
parent 47216 | 71c04702a3d5 |
child 53244 | 9807daeb47c4 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2011, 2017, 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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||
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#ifndef SHARE_VM_OOPS_FIELDSTREAMS_HPP |
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#define SHARE_VM_OOPS_FIELDSTREAMS_HPP |
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#include "oops/instanceKlass.hpp" |
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#include "oops/fieldInfo.hpp" |
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#include "runtime/fieldDescriptor.hpp" |
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// The is the base class for iteration over the fields array |
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// describing the declared fields in the class. Several subclasses |
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// are provided depending on the kind of iteration required. The |
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// JavaFieldStream is for iterating over regular Java fields and it |
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// generally the preferred iterator. InternalFieldStream only |
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// iterates over fields that have been injected by the JVM. |
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// AllFieldStream exposes all fields and should only be used in rare |
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// cases. |
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class FieldStreamBase : public StackObj { |
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protected: |
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Array<u2>* _fields; |
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constantPoolHandle _constants; |
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int _index; |
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int _limit; |
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int _generic_signature_slot; |
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fieldDescriptor _fd_buf; |
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FieldInfo* field() const { return FieldInfo::from_field_array(_fields, _index); } |
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InstanceKlass* field_holder() const { return _constants->pool_holder(); } |
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int init_generic_signature_start_slot() { |
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int length = _fields->length(); |
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int num_fields = _index; |
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int skipped_generic_signature_slots = 0; |
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FieldInfo* fi; |
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AccessFlags flags; |
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/* Scan from 0 to the current _index. Count the number of generic |
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signature slots for field[0] to field[_index - 1]. */ |
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for (int i = 0; i < _index; i++) { |
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fi = FieldInfo::from_field_array(_fields, i); |
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flags.set_flags(fi->access_flags()); |
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if (flags.field_has_generic_signature()) { |
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length --; |
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skipped_generic_signature_slots ++; |
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} |
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} |
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/* Scan from the current _index. */ |
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for (int i = _index; i*FieldInfo::field_slots < length; i++) { |
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fi = FieldInfo::from_field_array(_fields, i); |
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flags.set_flags(fi->access_flags()); |
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if (flags.field_has_generic_signature()) { |
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length --; |
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} |
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num_fields ++; |
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} |
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_generic_signature_slot = length + skipped_generic_signature_slots; |
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assert(_generic_signature_slot <= _fields->length(), ""); |
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return num_fields; |
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} |
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FieldStreamBase(Array<u2>* fields, const constantPoolHandle& constants, int start, int limit) { |
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_fields = fields; |
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_constants = constants; |
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_index = start; |
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int num_fields = init_generic_signature_start_slot(); |
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if (limit < start) { |
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_limit = num_fields; |
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} else { |
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_limit = limit; |
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} |
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} |
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FieldStreamBase(Array<u2>* fields, const constantPoolHandle& constants) { |
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_fields = fields; |
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_constants = constants; |
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_index = 0; |
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_limit = init_generic_signature_start_slot(); |
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} |
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public: |
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FieldStreamBase(InstanceKlass* klass) { |
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_fields = klass->fields(); |
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_constants = klass->constants(); |
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_index = 0; |
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_limit = klass->java_fields_count(); |
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init_generic_signature_start_slot(); |
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assert(klass == field_holder(), ""); |
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} |
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// accessors |
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int index() const { return _index; } |
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void next() { |
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if (access_flags().field_has_generic_signature()) { |
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_generic_signature_slot ++; |
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assert(_generic_signature_slot <= _fields->length(), ""); |
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} |
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_index += 1; |
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} |
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bool done() const { return _index >= _limit; } |
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// Accessors for current field |
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AccessFlags access_flags() const { |
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AccessFlags flags; |
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flags.set_flags(field()->access_flags()); |
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return flags; |
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} |
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void set_access_flags(u2 flags) const { |
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field()->set_access_flags(flags); |
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} |
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void set_access_flags(AccessFlags flags) const { |
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set_access_flags(flags.as_short()); |
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} |
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Symbol* name() const { |
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return field()->name(_constants); |
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} |
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Symbol* signature() const { |
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return field()->signature(_constants); |
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} |
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Symbol* generic_signature() const { |
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if (access_flags().field_has_generic_signature()) { |
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assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
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int index = _fields->at(_generic_signature_slot); |
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return _constants->symbol_at(index); |
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} else { |
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return NULL; |
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} |
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} |
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int offset() const { |
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return field()->offset(); |
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} |
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int allocation_type() const { |
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return field()->allocation_type(); |
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} |
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void set_offset(int offset) { |
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field()->set_offset(offset); |
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} |
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bool is_offset_set() const { |
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return field()->is_offset_set(); |
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} |
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bool is_contended() const { |
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return field()->is_contended(); |
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} |
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int contended_group() const { |
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return field()->contended_group(); |
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} |
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// bridge to a heavier API: |
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fieldDescriptor& field_descriptor() const { |
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fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf); |
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field.reinitialize(field_holder(), _index); |
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return field; |
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} |
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}; |
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// Iterate over only the internal fields |
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class JavaFieldStream : public FieldStreamBase { |
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public: |
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JavaFieldStream(const InstanceKlass* k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {} |
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int name_index() const { |
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194 |
assert(!field()->is_internal(), "regular only"); |
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return field()->name_index(); |
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} |
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197 |
void set_name_index(int index) { |
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assert(!field()->is_internal(), "regular only"); |
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field()->set_name_index(index); |
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200 |
} |
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int signature_index() const { |
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202 |
assert(!field()->is_internal(), "regular only"); |
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203 |
return field()->signature_index(); |
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} |
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void set_signature_index(int index) { |
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assert(!field()->is_internal(), "regular only"); |
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207 |
field()->set_signature_index(index); |
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} |
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int generic_signature_index() const { |
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210 |
assert(!field()->is_internal(), "regular only"); |
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if (access_flags().field_has_generic_signature()) { |
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assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
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return _fields->at(_generic_signature_slot); |
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} else { |
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return 0; |
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} |
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} |
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void set_generic_signature_index(int index) { |
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assert(!field()->is_internal(), "regular only"); |
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if (access_flags().field_has_generic_signature()) { |
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assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
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_fields->at_put(_generic_signature_slot, index); |
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} |
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} |
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int initval_index() const { |
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assert(!field()->is_internal(), "regular only"); |
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return field()->initval_index(); |
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} |
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void set_initval_index(int index) { |
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assert(!field()->is_internal(), "regular only"); |
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return field()->set_initval_index(index); |
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} |
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}; |
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// Iterate over only the internal fields |
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class InternalFieldStream : public FieldStreamBase { |
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public: |
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InternalFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {} |
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}; |
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class AllFieldStream : public FieldStreamBase { |
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public: |
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AllFieldStream(Array<u2>* fields, const constantPoolHandle& constants): FieldStreamBase(fields, constants) {} |
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AllFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants()) {} |
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}; |
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#endif // SHARE_VM_OOPS_FIELDSTREAMS_HPP |