1 /* Copyright (C) 2016 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.
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11  * This code is free software; you can redistribute it and/or modify it
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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.
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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).
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31 
32 #ifndef ART_OPENJDKJVMTI_TI_STACK_H_
33 #define ART_OPENJDKJVMTI_TI_STACK_H_
34 
35 #include "jni.h"
36 #include "jvmti.h"
37 
38 #include "art_method.h"
39 #include "base/mutex.h"
40 #include "stack.h"
41 
42 namespace openjdkjvmti {
43 
44 class StackUtil {
45  public:
46   static jvmtiError GetAllStackTraces(jvmtiEnv* env,
47                                       jint max_frame_count,
48                                       jvmtiStackInfo** stack_info_ptr,
49                                       jint* thread_count_ptr)
50       REQUIRES(!art::Locks::thread_list_lock_);
51 
52   static jvmtiError GetFrameCount(jvmtiEnv* env, jthread thread, jint* count_ptr);
53 
54   static jvmtiError GetFrameLocation(jvmtiEnv* env,
55                                      jthread thread,
56                                      jint depth,
57                                      jmethodID* method_ptr,
58                                      jlocation* location_ptr);
59 
60   static jvmtiError GetStackTrace(jvmtiEnv* env,
61                                   jthread thread,
62                                   jint start_depth,
63                                   jint max_frame_count,
64                                   jvmtiFrameInfo* frame_buffer,
65                                   jint* count_ptr);
66 
67   static jvmtiError GetThreadListStackTraces(jvmtiEnv* env,
68                                              jint thread_count,
69                                              const jthread* thread_list,
70                                              jint max_frame_count,
71                                              jvmtiStackInfo** stack_info_ptr);
72 
73   static jvmtiError GetOwnedMonitorStackDepthInfo(jvmtiEnv* env,
74                                                   jthread thread,
75                                                   jint* info_cnt_ptr,
76                                                   jvmtiMonitorStackDepthInfo** info_ptr);
77 
78   static jvmtiError GetOwnedMonitorInfo(jvmtiEnv* env,
79                                         jthread thread,
80                                         jint* owned_monitor_count_ptr,
81                                         jobject** owned_monitors_ptr);
82 
83   static jvmtiError NotifyFramePop(jvmtiEnv* env, jthread thread, jint depth);
84 };
85 
86 struct FindFrameAtDepthVisitor : art::StackVisitor {
87  public:
FindFrameAtDepthVisitorFindFrameAtDepthVisitor88   FindFrameAtDepthVisitor(art::Thread* target, art::Context* ctx, jint depth)
89       REQUIRES_SHARED(art::Locks::mutator_lock_)
90       : art::StackVisitor(target, ctx, art::StackVisitor::StackWalkKind::kIncludeInlinedFrames),
91         found_frame_(false),
92         cnt_(0),
93         depth_(static_cast<size_t>(depth)) { }
94 
FoundFrameFindFrameAtDepthVisitor95   bool FoundFrame() {
96     return found_frame_;
97   }
98 
VisitFrameFindFrameAtDepthVisitor99   bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS {
100     if (GetMethod()->IsRuntimeMethod()) {
101       return true;
102     }
103     if (cnt_ == depth_) {
104       // We found our frame, exit.
105       found_frame_ = true;
106       return false;
107     } else {
108       cnt_++;
109       return true;
110     }
111   }
112 
113  private:
114   bool found_frame_;
115   size_t cnt_;
116   size_t depth_;
117 };
118 
119 }  // namespace openjdkjvmti
120 
121 #endif  // ART_OPENJDKJVMTI_TI_STACK_H_
122