1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package art;
18 
19 import java.lang.reflect.Field;
20 import java.lang.reflect.Executable;
21 
22 public class StackTrace {
23   public static class StackFrameData {
24     public final Thread thr;
25     public final Executable method;
26     public final long current_location;
27     public final int depth;
28 
StackFrameData(Thread thr, Executable e, long loc, int depth)29     public StackFrameData(Thread thr, Executable e, long loc, int depth) {
30       this.thr = thr;
31       this.method = e;
32       this.current_location = loc;
33       this.depth = depth;
34     }
35     @Override
toString()36     public String toString() {
37       return String.format(
38           "StackFrameData { thr: '%s', method: '%s', loc: %d, depth: %d }",
39           this.thr,
40           this.method,
41           this.current_location,
42           this.depth);
43     }
44   }
45 
GetStackDepth(Thread thr)46   public static native int GetStackDepth(Thread thr);
47 
nativeGetStackTrace(Thread thr)48   private static native StackFrameData[] nativeGetStackTrace(Thread thr);
49 
GetStackTrace(Thread thr)50   public static StackFrameData[] GetStackTrace(Thread thr) {
51     // The RI seems to give inconsistent (and sometimes nonsensical) results if the thread is not
52     // suspended. The spec says that not being suspended is fine but since we want this to be
53     // consistent we will suspend for the RI.
54     boolean suspend_thread =
55         !System.getProperty("java.vm.name").equals("Dalvik") &&
56         !thr.equals(Thread.currentThread()) &&
57         !Suspension.isSuspended(thr);
58     if (suspend_thread) {
59       Suspension.suspend(thr);
60     }
61     StackFrameData[] out = nativeGetStackTrace(thr);
62     if (suspend_thread) {
63       Suspension.resume(thr);
64     }
65     return out;
66   }
67 }
68 
69