| /* |
| * 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/support/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; |
| } |
