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.
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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                                   SEVERITY_LAMBDA(severity), \
54                                   _LOG_TAG_INTERNAL,         \
55                                   -1)
56 
57 class JvmtiLogMessage {
58  public:
JvmtiLogMessage(jvmtiEnv * env,const char * file,unsigned int line,android::base::LogSeverity severity,const char * tag,int error)59   JvmtiLogMessage(jvmtiEnv* env,
60                   const char* file,
61                   unsigned int line,
62                   android::base::LogSeverity severity,
63                   const char* tag,
64                   int error)
65       : env_(ArtJvmTiEnv::AsArtJvmTiEnv(env)),
66         real_log_(file, line, severity, tag, error),
67         real_log_stream_(real_log_.stream()) {
68     DCHECK(env_ != nullptr);
69   }
70 
~JvmtiLogMessage()71   ~JvmtiLogMessage() {
72     art::MutexLock mu(art::Thread::Current(), env_->last_error_mutex_);
73     env_->last_error_ = save_stream_.str();
74   }
75 
76   template<typename T>
77   JvmtiLogMessage& operator<<(T t) {
78     (real_log_stream_ << t);
79     (save_stream_ << t);
80     return *this;
81   }
82 
83  private:
84   ArtJvmTiEnv* env_;
85   android::base::LogMessage real_log_;
86   // Lifetime of real_log_stream_ is lifetime of real_log_.
87   std::ostream& real_log_stream_;
88   std::ostringstream save_stream_;
89 
90   DISALLOW_COPY_AND_ASSIGN(JvmtiLogMessage);
91 };
92 
93 class LogUtil {
94  public:
95   static jvmtiError ClearLastError(jvmtiEnv* env);
96   static jvmtiError GetLastError(jvmtiEnv* env, char** data);
97 
98   static jvmtiError SetVerboseFlag(jvmtiEnv* env, jvmtiVerboseFlag flag, jboolean value);
99   static jvmtiError SetVerboseFlagExt(jvmtiEnv* env, const char* data, jboolean enable);
100 };
101 
102 }  // namespace openjdkjvmti
103 
104 #endif  // ART_OPENJDKJVMTI_TI_LOGGING_H_
105