author | mgronlun |
Wed, 28 Aug 2019 12:03:58 +0200 | |
branch | JEP-349-branch |
changeset 57902 | f6502e486572 |
parent 54847 | 59ea39bb2809 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 2019, 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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#include "precompiled.hpp" |
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#include "classfile/javaClasses.hpp" |
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#include "classfile/symbolTable.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "jfr/leakprofiler/checkpoint/objectSampleDescription.hpp" |
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#include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/fieldDescriptor.inline.hpp" |
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#include "runtime/thread.hpp" |
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#include "utilities/ostream.hpp" |
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static Symbol* symbol_size = NULL; |
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ObjectDescriptionBuilder::ObjectDescriptionBuilder() { |
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reset(); |
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} |
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void ObjectDescriptionBuilder::write_int(jint value) { |
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char buf[20]; |
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jio_snprintf(buf, sizeof(buf), "%d", value); |
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write_text(buf); |
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} |
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void ObjectDescriptionBuilder::write_text(const char* text) { |
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if (_index == sizeof(_buffer) - 2) { |
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return; |
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} |
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while (*text != '\0' && _index < sizeof(_buffer) - 2) { |
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_buffer[_index] = *text; |
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_index++; |
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text++; |
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} |
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assert(_index < sizeof(_buffer) - 1, "index should not exceed buffer size"); |
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// add ellipsis if we reached end |
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if (_index == sizeof(_buffer) - 2) { |
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_buffer[_index-3] = '.'; |
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_buffer[_index-2] = '.'; |
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_buffer[_index-1] = '.'; |
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} |
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// terminate string |
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_buffer[_index] = '\0'; |
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} |
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void ObjectDescriptionBuilder::reset() { |
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_index = 0; |
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_buffer[0] = '\0'; |
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} |
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void ObjectDescriptionBuilder::print_description(outputStream* out) { |
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out->print("%s", (const char*)_buffer); |
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} |
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const char* ObjectDescriptionBuilder::description() { |
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if (_buffer[0] == '\0') { |
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return NULL; |
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} |
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const size_t len = strlen(_buffer); |
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char* copy = NEW_RESOURCE_ARRAY(char, len + 1); |
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assert(copy != NULL, "invariant"); |
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strncpy(copy, _buffer, len + 1); |
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return copy; |
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} |
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ObjectSampleDescription::ObjectSampleDescription(oop object) : |
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_object(object) { |
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} |
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void ObjectSampleDescription::ensure_initialized() { |
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if (symbol_size == NULL) { |
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symbol_size = SymbolTable::new_permanent_symbol("size"); |
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} |
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} |
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void ObjectSampleDescription::print_description(outputStream* out) { |
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write_object_to_buffer(); |
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_description.print_description(out); |
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} |
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const char* ObjectSampleDescription::description() { |
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write_object_to_buffer(); |
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return _description.description(); |
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} |
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void ObjectSampleDescription::write_text(const char* text) { |
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_description.write_text(text); |
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} |
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void ObjectSampleDescription::write_int(jint value) { |
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_description.write_int(value); |
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} |
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void ObjectSampleDescription::write_object_to_buffer() { |
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ensure_initialized(); |
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_description.reset(); |
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write_object_details(); |
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} |
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void ObjectSampleDescription::write_object_details() { |
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Klass* klass = _object->klass(); |
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Symbol* class_name = klass->name(); |
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jint size; |
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if (_object->is_a(SystemDictionary::Class_klass())) { |
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write_class_name(); |
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return; |
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} |
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if (_object->is_a(SystemDictionary::Thread_klass())) { |
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write_thread_name(); |
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return; |
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} |
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if (_object->is_a(SystemDictionary::ThreadGroup_klass())) { |
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write_thread_group_name(); |
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return; |
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} |
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if (read_int_size(&size)) { |
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write_size(size); |
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return; |
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} |
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} |
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void ObjectSampleDescription::write_class_name() { |
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assert(_object->is_a(SystemDictionary::Class_klass()), "invariant"); |
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const Klass* const k = java_lang_Class::as_Klass(_object); |
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if (k == NULL) { |
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// might represent a primitive |
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const Klass* const ak = java_lang_Class::array_klass_acquire(_object); |
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// If ak is NULL, this is most likely a mirror associated with a |
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// jvmti redefine/retransform scratch klass. We can't get any additional |
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// information from it. |
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if (ak != NULL) { |
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write_text(type2name(java_lang_Class::primitive_type(_object))); |
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} |
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return; |
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} |
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if (k->is_instance_klass()) { |
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const InstanceKlass* ik = InstanceKlass::cast(k); |
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if (ik->is_unsafe_anonymous()) { |
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return; |
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} |
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assert(!ik->is_unsafe_anonymous(), "invariant"); |
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const Symbol* name = ik->name(); |
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if (name != NULL) { |
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write_text("Class Name: "); |
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write_text(name->as_klass_external_name()); |
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} |
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} |
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} |
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void ObjectSampleDescription::write_thread_group_name() { |
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assert(_object->is_a(SystemDictionary::ThreadGroup_klass()), "invariant"); |
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const char* tg_name = java_lang_ThreadGroup::name(_object); |
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if (tg_name != NULL) { |
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write_text("Thread Group: "); |
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write_text(tg_name); |
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} |
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} |
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void ObjectSampleDescription::write_thread_name() { |
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assert(_object->is_a(SystemDictionary::Thread_klass()), "invariant"); |
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oop name = java_lang_Thread::name(_object); |
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if (name != NULL) { |
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char* p = java_lang_String::as_utf8_string(name); |
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if (p != NULL) { |
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write_text("Thread Name: "); |
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write_text(p); |
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} |
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} |
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} |
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void ObjectSampleDescription::write_size(jint size) { |
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if (size >= 0) { |
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write_text("Size: "); |
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write_int(size); |
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} |
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} |
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bool ObjectSampleDescription::read_int_size(jint* result_size) { |
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fieldDescriptor fd; |
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Klass* klass = _object->klass(); |
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if (klass->is_instance_klass()) { |
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InstanceKlass* ik = InstanceKlass::cast(klass); |
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if (ik->find_field(symbol_size, vmSymbols::int_signature(), false, &fd) != NULL) { |
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jint size = _object->int_field(fd.offset()); |
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*result_size = size; |
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return true; |
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} |
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} |
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return false; |
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} |