Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * 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 "memory/oopFactory.hpp"

 #include "oops/oop.inline.hpp"

 #include "oops/typeArrayKlass.hpp"

 #include "oops/typeArrayOop.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) {

     if (true) tty->print_cr("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);

   if (true) tty->print_cr("%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;

 }

 instanceKlassHandle JfrUpcalls::load_event_handler_proxy_class(TRAPS) {

   JavaValue result(T_OBJECT);

   JfrJavaArguments call_args(&result, "jdk/jfr/internal/JVMUpcalls",

           "getEventHandlerProxyClass", "()Ljava/lang/Class;", CHECK_NULL);

   JfrJavaSupport::call_static(&call_args, CHECK_NULL);

   assert(result.get_type() == T_OBJECT, "invariant");

   instanceHandle h_java_proxy(THREAD, (instanceOop)result.get_jobject());

   assert(h_java_proxy.not_null(), "invariant");

   return java_lang_Class::as_Klass(h_java_proxy());

 }