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64 lines
3.1 KiB
64 lines
3.1 KiB
4 months ago
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# simpleprofile
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simpleprofile is a JVMTI agent that lets one get simple JSON profiles with JVMTI
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# Usage
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### Build
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> `m libsimpleprofile` # or 'm libsimpleprofiled' with debugging checks enabled
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For binaries with NDK shared libraries only.
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> `m libsimpleprofiled` # or `m libsimpleprofileds` with debugging checks enabled.
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The libraries will be built for 32-bit, 64-bit, host and target. Below examples
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assume you want to use the 64-bit version.
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### Command Line
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The agent is loaded using -agentpath like normal. It takes arguments in the
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following format:
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> `file-output[,dump_on_shutdown][,dump_on_main_stop]`
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#### ART
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> `art -Xplugin:$ANDROID_HOST_OUT/lib64/libopenjdkjvmti.so '-agentpath:libsimpleprofiled.so=/proc/self/fd/2,dump_on_main_stop' -cp tmp/java/helloworld.dex -Xint helloworld`
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* `-Xplugin` and `-agentpath` need to be used, otherwise the agent will fail during init.
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* If using `libartd.so`, make sure to use the debug version of jvmti.
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#### Device
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```
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% adb root
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% adb shell setenforce 0
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% adb push $OUT/system/lib64/libsimpleprofileds.so /data/local/tmp/libsimpleprofileds.so
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% adb shell
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blueline:/data/data/com.google.android.apps.maps # cp /data/local/tmp/libsimpleprofileds.so .
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blueline:/data/data/com.google.android.apps.maps # ps -A | grep maps
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u0_a178 9143 927 15691440 190132 SyS_epoll_wait 0 S com.google.android.apps.maps
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blueline:/data/data/com.google.android.apps.maps # cmd activity attach-agent com.google.android.apps.maps $PWD/libsimpleprofileds.so=$PWD/maps.json
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blueline:/data/data/com.google.android.apps.maps # # Do things on the app.
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blueline:/data/data/com.google.android.apps.maps # kill -3 9143
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blueline:/data/data/com.google.android.apps.maps # wc -l maps.json
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17901 maps.json
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blueline:/data/data/com.google.android.apps.maps # ^D
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% adb pull /data/data/com.google.android.apps.maps/maps.json
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```
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#### RI
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> `java '-agentpath:libsimpleprofiled.so=/proc/self/fd/2,dump_on_main_stop' -cp tmp/helloworld/classes helloworld`
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### Output
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A normal run will look something like this:
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% ./test/run-test --64 --host --dev --with-agent $ANDROID_HOST_OUT/lib64/libsimpleprofiled.so=dump_on_main_stop,/proc/self/fd/1 001-HelloWorld
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<normal output removed>
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Hello, world!
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...
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{"class_name":"Ljava/util/HashMap$KeySet;","method_name":"iterator","method_descriptor":"()Ljava/util/Iterator;","count":6},
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{"class_name":"Ljava/util/HashMap$KeyIterator;","method_name":"<init>","method_descriptor":"(Ljava/util/HashMap;)V","count":6},
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{"class_name":"Ljava/util/HashMap$HashIterator;","method_name":"<init>","method_descriptor":"(Ljava/util/HashMap;)V","count":6},
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{"class_name":"Ljava/lang/String;","method_name":"equals","method_descriptor":"(Ljava/lang/Object;)Z","count":128},
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{"class_name":"Ljava/util/Collections$UnmodifiableCollection$1;","method_name":"next","method_descriptor":"()Ljava/lang/Object;","count":38},
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{"class_name":"Ljava/util/HashMap$KeyIterator;","method_name":"next","method_descriptor":"()Ljava/lang/Object;","count":38},
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{"class_name":"Lsun/misc/Cleaner;","method_name":"add","method_descriptor":"(Lsun/misc/Cleaner;)Lsun/misc/Cleaner;","count":1},
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...
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