--- /dev/null 2017-11-09 09:38:01.297999907 +0100 +++ new/src/hotspot/share/jfr/jni/jfrUpcalls.cpp 2018-04-09 14:34:04.976710664 +0200 @@ -0,0 +1,180 @@ +/* + * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#include "precompiled.hpp" +#include "classfile/javaClasses.hpp" +#include "classfile/symbolTable.hpp" +#include "classfile/systemDictionary.hpp" +#include "jfr/jni/jfrJavaSupport.hpp" +#include "jfr/jni/jfrUpcalls.hpp" +#include "jfr/recorder/access/jfrEventClass.hpp" +#include "logging/log.hpp" +#include "memory/oopFactory.hpp" +#include "oops/oop.inline.hpp" +#include "oops/typeArrayKlass.hpp" +#include "oops/typeArrayOop.inline.hpp" +#include "runtime/handles.inline.hpp" +#include "runtime/os.hpp" +#include "runtime/thread.inline.hpp" +#include "utilities/exceptions.hpp" + +static Symbol* jvm_upcalls_class_sym = NULL; +static Symbol* on_retransform_method_sym = NULL; +static Symbol* on_retransform_signature_sym = NULL; +static Symbol* bytes_for_eager_instrumentation_sym = NULL; +static Symbol* bytes_for_eager_instrumentation_sig_sym = NULL; + +static bool initialize(TRAPS) { + static bool initialized = false; + if (!initialized) { + DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD)); + jvm_upcalls_class_sym = SymbolTable::new_permanent_symbol("jdk/jfr/internal/JVMUpcalls", CHECK_false); + on_retransform_method_sym = SymbolTable::new_permanent_symbol("onRetransform", CHECK_false); + on_retransform_signature_sym = SymbolTable::new_permanent_symbol("(JZLjava/lang/Class;[B)[B", CHECK_false); + bytes_for_eager_instrumentation_sym = SymbolTable::new_permanent_symbol("bytesForEagerInstrumentation", CHECK_false); + bytes_for_eager_instrumentation_sig_sym = SymbolTable::new_permanent_symbol("(JZLjava/lang/Class;[B)[B", THREAD); + initialized = bytes_for_eager_instrumentation_sig_sym != NULL; + } + return initialized; +} + +static const typeArrayOop invoke(jlong trace_id, + jboolean force_instrumentation, + jclass class_being_redefined, + jint class_data_len, + const unsigned char* class_data, + Symbol* method_sym, + Symbol* signature_sym, + jint& new_bytes_length, + TRAPS) { + DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD)); + const Klass* klass = SystemDictionary::resolve_or_fail(jvm_upcalls_class_sym, true, CHECK_NULL); + assert(klass != NULL, "invariant"); + typeArrayOop old_byte_array = oopFactory::new_byteArray(class_data_len, CHECK_NULL); + memcpy(old_byte_array->byte_at_addr(0), class_data, class_data_len); + JavaValue result(T_OBJECT); + JfrJavaArguments args(&result, klass, method_sym, signature_sym); + args.push_long(trace_id); + args.push_int(force_instrumentation); + args.push_jobject(class_being_redefined); + args.push_oop(old_byte_array); + JfrJavaSupport::call_static(&args, THREAD); + if (HAS_PENDING_EXCEPTION) { + log_error(jfr, system)("JfrUpcall failed"); + return NULL; + } + // The result should be a [B + const oop res = (oop)result.get_jobject(); + assert(res != NULL, "invariant"); + assert(res->is_typeArray(), "invariant"); + assert(TypeArrayKlass::cast(res->klass())->element_type() == T_BYTE, "invariant"); + const typeArrayOop new_byte_array = typeArrayOop(res); + new_bytes_length = (jint)new_byte_array->length(); + return new_byte_array; +} + +static const size_t ERROR_MSG_BUFFER_SIZE = 256; +static void log_error_and_throw_oom(jint new_bytes_length, TRAPS) { + char error_buffer[ERROR_MSG_BUFFER_SIZE]; + jio_snprintf(error_buffer, ERROR_MSG_BUFFER_SIZE, + "Thread local allocation (native) for " SIZE_FORMAT " bytes failed in JfrUpcalls", (size_t)new_bytes_length); + log_error(jfr, system)("%s", error_buffer); + JfrJavaSupport::throw_out_of_memory_error(error_buffer, CHECK); +} + +void JfrUpcalls::on_retransform(jlong trace_id, + jclass class_being_redefined, + jint class_data_len, + const unsigned char* class_data, + jint* new_class_data_len, + unsigned char** new_class_data, + TRAPS) { + DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD)); + assert(class_being_redefined != NULL, "invariant"); + assert(class_data != NULL, "invariant"); + assert(new_class_data_len != NULL, "invariant"); + assert(new_class_data != NULL, "invariant"); + if (!JdkJfrEvent::is_visible(class_being_redefined)) { + return; + } + jint new_bytes_length = 0; + initialize(THREAD); + const typeArrayOop new_byte_array = invoke(trace_id, + false, + class_being_redefined, + class_data_len, + class_data, + on_retransform_method_sym, + on_retransform_signature_sym, + new_bytes_length, + CHECK); + assert(new_byte_array != NULL, "invariant"); + assert(new_bytes_length > 0, "invariant"); + // memory space must be malloced as mtInternal + // as it will be deallocated by JVMTI routines + unsigned char* const new_bytes = (unsigned char* const)os::malloc(new_bytes_length, mtInternal); + if (new_bytes == NULL) { + log_error_and_throw_oom(new_bytes_length, THREAD); // unwinds + } + assert(new_bytes != NULL, "invariant"); + memcpy(new_bytes, new_byte_array->byte_at_addr(0), (size_t)new_bytes_length); + *new_class_data_len = new_bytes_length; + *new_class_data = new_bytes; +} + +void JfrUpcalls::new_bytes_eager_instrumentation(jlong trace_id, + jboolean force_instrumentation, + jclass super, + jint class_data_len, + const unsigned char* class_data, + jint* new_class_data_len, + unsigned char** new_class_data, + TRAPS) { + DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD)); + assert(super != NULL, "invariant"); + assert(class_data != NULL, "invariant"); + assert(new_class_data_len != NULL, "invariant"); + assert(new_class_data != NULL, "invariant"); + jint new_bytes_length = 0; + initialize(THREAD); + const typeArrayOop new_byte_array = invoke(trace_id, + force_instrumentation, + super, + class_data_len, + class_data, + bytes_for_eager_instrumentation_sym, + bytes_for_eager_instrumentation_sig_sym, + new_bytes_length, + CHECK); + assert(new_byte_array != NULL, "invariant"); + assert(new_bytes_length > 0, "invariant"); + unsigned char* const new_bytes = NEW_RESOURCE_ARRAY_IN_THREAD_RETURN_NULL(THREAD, unsigned char, new_bytes_length); + if (new_bytes == NULL) { + log_error_and_throw_oom(new_bytes_length, THREAD); // this unwinds + } + assert(new_bytes != NULL, "invariant"); + memcpy(new_bytes, new_byte_array->byte_at_addr(0), (size_t)new_bytes_length); + *new_class_data_len = new_bytes_length; + *new_class_data = new_bytes; +}