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      1 /* Copyright (C) 2018 The Android Open Source Project
      2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
      3  *
      4  * This file implements interfaces from the file jvmti.h. This implementation
      5  * is licensed under the same terms as the file jvmti.h.  The
      6  * copyright and license information for the file jvmti.h follows.
      7  *
      8  * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
      9  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     10  *
     11  * This code is free software; you can redistribute it and/or modify it
     12  * under the terms of the GNU General Public License version 2 only, as
     13  * published by the Free Software Foundation.  Oracle designates this
     14  * particular file as subject to the "Classpath" exception as provided
     15  * by Oracle in the LICENSE file that accompanied this code.
     16  *
     17  * This code is distributed in the hope that it will be useful, but WITHOUT
     18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     20  * version 2 for more details (a copy is included in the LICENSE file that
     21  * accompanied this code).
     22  *
     23  * You should have received a copy of the GNU General Public License version
     24  * 2 along with this work; if not, write to the Free Software Foundation,
     25  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
     26  *
     27  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
     28  * or visit www.oracle.com if you need additional information or have any
     29  * questions.
     30  */
     31 
     32 #ifndef ART_OPENJDKJVMTI_TI_LOGGING_H_
     33 #define ART_OPENJDKJVMTI_TI_LOGGING_H_
     34 
     35 #include "art_jvmti.h"
     36 
     37 #include <ostream>
     38 #include <sstream>
     39 
     40 #include <android-base/logging.h>
     41 #include <android-base/macros.h>
     42 
     43 #include "base/mutex.h"
     44 #include "thread-current-inl.h"
     45 
     46 namespace openjdkjvmti {
     47 
     48 // NB Uses implementation details of android-base/logging.h.
     49 #define JVMTI_LOG(severity, env)                             \
     50   ::openjdkjvmti::JvmtiLogMessage((env),                     \
     51                                   __FILE__,                  \
     52                                   __LINE__,                  \
     53                                   ::android::base::DEFAULT,  \
     54                                   SEVERITY_LAMBDA(severity), \
     55                                   _LOG_TAG_INTERNAL,         \
     56                                   -1)
     57 
     58 class JvmtiLogMessage {
     59  public:
     60   JvmtiLogMessage(jvmtiEnv* env,
     61                   const char* file,
     62                   unsigned int line,
     63                   android::base::LogId id,
     64                   android::base::LogSeverity severity,
     65                   const char* tag,
     66                   int error)
     67       : env_(ArtJvmTiEnv::AsArtJvmTiEnv(env)),
     68         real_log_(file, line, id, severity, tag, error),
     69         real_log_stream_(real_log_.stream()) {
     70     DCHECK(env_ != nullptr);
     71   }
     72 
     73   ~JvmtiLogMessage() {
     74     art::MutexLock mu(art::Thread::Current(), env_->last_error_mutex_);
     75     env_->last_error_ = save_stream_.str();
     76   }
     77 
     78   template<typename T>
     79   JvmtiLogMessage& operator<<(T t) {
     80     (real_log_stream_ << t);
     81     (save_stream_ << t);
     82     return *this;
     83   }
     84 
     85  private:
     86   ArtJvmTiEnv* env_;
     87   android::base::LogMessage real_log_;
     88   // Lifetime of real_log_stream_ is lifetime of real_log_.
     89   std::ostream& real_log_stream_;
     90   std::ostringstream save_stream_;
     91 
     92   DISALLOW_COPY_AND_ASSIGN(JvmtiLogMessage);
     93 };
     94 
     95 class LogUtil {
     96  public:
     97   static jvmtiError ClearLastError(jvmtiEnv* env);
     98   static jvmtiError GetLastError(jvmtiEnv* env, char** data);
     99 };
    100 
    101 }  // namespace openjdkjvmti
    102 
    103 #endif  // ART_OPENJDKJVMTI_TI_LOGGING_H_
    104