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/*
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* Copyright (c) 2016, 2018, 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/jni/jfrJavaSupport.hpp"
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#include "jfr/jni/jfrUpcalls.hpp"
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#include "jfr/support/jfrEventClass.hpp"
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#include "logging/log.hpp"
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#include "memory/oopFactory.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/typeArrayKlass.hpp"
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#include "oops/typeArrayOop.inline.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/os.hpp"
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#include "runtime/thread.inline.hpp"
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#include "utilities/exceptions.hpp"
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static Symbol* jvm_upcalls_class_sym = NULL;
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static Symbol* on_retransform_method_sym = NULL;
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static Symbol* on_retransform_signature_sym = NULL;
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static Symbol* bytes_for_eager_instrumentation_sym = NULL;
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static Symbol* bytes_for_eager_instrumentation_sig_sym = NULL;
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static bool initialize(TRAPS) {
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static bool initialized = false;
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if (!initialized) {
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DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
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jvm_upcalls_class_sym = SymbolTable::new_permanent_symbol("jdk/jfr/internal/JVMUpcalls", CHECK_false);
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on_retransform_method_sym = SymbolTable::new_permanent_symbol("onRetransform", CHECK_false);
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on_retransform_signature_sym = SymbolTable::new_permanent_symbol("(JZLjava/lang/Class;[B)[B", CHECK_false);
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bytes_for_eager_instrumentation_sym = SymbolTable::new_permanent_symbol("bytesForEagerInstrumentation", CHECK_false);
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bytes_for_eager_instrumentation_sig_sym = SymbolTable::new_permanent_symbol("(JZLjava/lang/Class;[B)[B", THREAD);
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initialized = bytes_for_eager_instrumentation_sig_sym != NULL;
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}
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return initialized;
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}
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static const typeArrayOop invoke(jlong trace_id,
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jboolean force_instrumentation,
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jclass class_being_redefined,
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jint class_data_len,
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const unsigned char* class_data,
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Symbol* method_sym,
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Symbol* signature_sym,
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jint& new_bytes_length,
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TRAPS) {
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DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
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const Klass* klass = SystemDictionary::resolve_or_fail(jvm_upcalls_class_sym, true, CHECK_NULL);
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assert(klass != NULL, "invariant");
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typeArrayOop old_byte_array = oopFactory::new_byteArray(class_data_len, CHECK_NULL);
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memcpy(old_byte_array->byte_at_addr(0), class_data, class_data_len);
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JavaValue result(T_OBJECT);
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JfrJavaArguments args(&result, klass, method_sym, signature_sym);
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args.push_long(trace_id);
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args.push_int(force_instrumentation);
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args.push_jobject(class_being_redefined);
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args.push_oop(old_byte_array);
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JfrJavaSupport::call_static(&args, THREAD);
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if (HAS_PENDING_EXCEPTION) {
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log_error(jfr, system)("JfrUpcall failed");
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return NULL;
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}
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// The result should be a [B
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const oop res = (oop)result.get_jobject();
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assert(res != NULL, "invariant");
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assert(res->is_typeArray(), "invariant");
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assert(TypeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "invariant");
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const typeArrayOop new_byte_array = typeArrayOop(res);
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new_bytes_length = (jint)new_byte_array->length();
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return new_byte_array;
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}
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static const size_t ERROR_MSG_BUFFER_SIZE = 256;
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static void log_error_and_throw_oom(jint new_bytes_length, TRAPS) {
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char error_buffer[ERROR_MSG_BUFFER_SIZE];
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jio_snprintf(error_buffer, ERROR_MSG_BUFFER_SIZE,
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"Thread local allocation (native) for " SIZE_FORMAT " bytes failed in JfrUpcalls", (size_t)new_bytes_length);
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log_error(jfr, system)("%s", error_buffer);
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JfrJavaSupport::throw_out_of_memory_error(error_buffer, CHECK);
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}
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void JfrUpcalls::on_retransform(jlong trace_id,
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jclass class_being_redefined,
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jint class_data_len,
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const unsigned char* class_data,
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jint* new_class_data_len,
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unsigned char** new_class_data,
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TRAPS) {
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DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
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assert(class_being_redefined != NULL, "invariant");
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assert(class_data != NULL, "invariant");
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assert(new_class_data_len != NULL, "invariant");
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assert(new_class_data != NULL, "invariant");
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if (!JdkJfrEvent::is_visible(class_being_redefined)) {
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return;
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}
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jint new_bytes_length = 0;
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initialize(THREAD);
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const typeArrayOop new_byte_array = invoke(trace_id,
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false,
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class_being_redefined,
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class_data_len,
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class_data,
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on_retransform_method_sym,
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on_retransform_signature_sym,
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new_bytes_length,
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CHECK);
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assert(new_byte_array != NULL, "invariant");
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assert(new_bytes_length > 0, "invariant");
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// memory space must be malloced as mtInternal
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// as it will be deallocated by JVMTI routines
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unsigned char* const new_bytes = (unsigned char* const)os::malloc(new_bytes_length, mtInternal);
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if (new_bytes == NULL) {
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log_error_and_throw_oom(new_bytes_length, THREAD); // unwinds
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}
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assert(new_bytes != NULL, "invariant");
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memcpy(new_bytes, new_byte_array->byte_at_addr(0), (size_t)new_bytes_length);
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*new_class_data_len = new_bytes_length;
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*new_class_data = new_bytes;
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}
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void JfrUpcalls::new_bytes_eager_instrumentation(jlong trace_id,
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jboolean force_instrumentation,
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jclass super,
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jint class_data_len,
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const unsigned char* class_data,
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jint* new_class_data_len,
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unsigned char** new_class_data,
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TRAPS) {
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DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
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assert(super != NULL, "invariant");
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assert(class_data != NULL, "invariant");
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assert(new_class_data_len != NULL, "invariant");
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assert(new_class_data != NULL, "invariant");
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jint new_bytes_length = 0;
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initialize(THREAD);
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const typeArrayOop new_byte_array = invoke(trace_id,
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force_instrumentation,
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super,
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class_data_len,
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class_data,
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bytes_for_eager_instrumentation_sym,
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bytes_for_eager_instrumentation_sig_sym,
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new_bytes_length,
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CHECK);
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assert(new_byte_array != NULL, "invariant");
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assert(new_bytes_length > 0, "invariant");
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unsigned char* const new_bytes = NEW_RESOURCE_ARRAY_IN_THREAD_RETURN_NULL(THREAD, unsigned char, new_bytes_length);
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if (new_bytes == NULL) {
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log_error_and_throw_oom(new_bytes_length, THREAD); // this unwinds
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}
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assert(new_bytes != NULL, "invariant");
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memcpy(new_bytes, new_byte_array->byte_at_addr(0), (size_t)new_bytes_length);
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*new_class_data_len = new_bytes_length;
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*new_class_data = new_bytes;
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}
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