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README.md

1# enablevlog
2
3enablevlog is a JVMTI agent designed for changing the VLOG options of a
4running process. Currently it only allows one to turn vlog options 'on'.
5
6# Usage
7### Build
8>    `m libenablevlog`
9
10The libraries will be built for 32-bit, 64-bit, host and target. Below
11examples assume you want to use the 64-bit version.
12
13Use `libenablevlogs` if you wish to build a version without non-NDK dynamic
14dependencies.
15
16### Command Line
17
18The agent is loaded using -agentpath like normal. It takes arguments in the
19following format:
20
21`[vlog1[,vlog2[,...]]]`
22
23It will cause the runtime to act as though you had passed these after the
24`-verbose:[...]` argument to `dalvikvm`.
25
26#### Supported events
27
28At the time of writing, the following events may be listened for with this agent
29
30* `class`
31
32* `collector`
33
34* `compiler`
35
36* `deopt`
37
38* `gc`
39
40* `heap`
41
42* `interpreter`
43
44* `jdwp`
45
46* `jit`
47
48* `jni`
49
50* `monitor`
51
52* `oat`
53
54* `profiler`
55
56* `signals`
57
58* `simulator`
59
60* `startup`
61
62* `third-party-jni`
63
64* `threads`
65
66* `verifier`
67
68* `verifier-debug`
69
70* `image`
71
72* `systrace-locks`
73
74* `plugin`
75
76* `agents`
77
78* `dex`
79
80These are not particularly stable and new options might get added. Examine
81the LogVerbosity struct definition and the parser for a up-to-date list.
82
83#### ART
84>    `art -Xplugin:$ANDROID_HOST_OUT/lib64/libopenjdkjvmti.so '-agentpath:libenablevlog.so=class,profiler' -cp tmp/java/helloworld.dex -Xint helloworld`
85
86* `-Xplugin` and `-agentpath` need to be used, otherwise the agent will fail during init.
87* If using `libartd.so`, make sure to use the debug version of jvmti.
88
89>    `adb shell setenforce 0`
90>
91>    `adb push $ANDROID_PRODUCT_OUT/system/lib64/libenablevlog.so /data/local/tmp/`
92>
93>    `adb shell am start-activity --attach-agent /data/local/tmp/libenablevlog.so=class,jit some.debuggable.apps/.the.app.MainActivity`
94