listextensions is a jvmti agent that will print the details of all available jvmti extension functions and events.
m liblistextensions
The libraries will be built for 32-bit, 64-bit, host and target. Below examples assume you want to use the 64-bit version.
art -Xplugin:$ANDROID_HOST_OUT/lib64/libopenjdkjvmti.so '-agentpath:liblistextensions.so' -cp tmp/java/helloworld.dex -Xint helloworld
This will print something similar to:
dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:104] Found 13 extension functions dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:107] com.android.art.heap.get_object_heap_id dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:108] desc: Retrieve the heap id of the object tagged with the given argument. An arbitrary object is chosen if multiple objects exist with the same tag. dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:109] arguments: (count: 2) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:112] tag (IN, JLONG) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:112] heap_id (OUT, JINT) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:114] Errors: (count: 1) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:118] JVMTI_ERROR_NOT_FOUND dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:107] com.android.art.heap.get_heap_name dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:108] desc: Retrieve the name of the heap with the given id. dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:109] arguments: (count: 2) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:112] heap_id (IN, JINT) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:112] heap_name (ALLOC_BUF, CCHAR) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:114] Errors: (count: 1) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:118] JVMTI_ERROR_ILLEGAL_ARGUMENT ... dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:130] Found 2 extension events dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:133] com.android.art.internal.ddm.publish_chunk dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:134] index: 86 dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:135] desc: Called when there is new ddms information that the agent or other clients can use. The agent is given the 'type' of the ddms chunk and a 'data_size' byte-buffer in 'data'. The 'data' pointer is only valid for the duration of the publish_chunk event. The agent is responsible for interpreting the information present in the 'data' buffer. This is provided for backwards-compatibility support only. Agents should prefer to use relevant JVMTI events and functions above listening for this event. dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:136] event arguments: (count: 4) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:139] jni_env (IN_PTR, JNIENV) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:139] type (IN, JINT) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:139] data_size (IN, JINT) dalvikvm64 I 07-30 10:47:37 154719 154719 list-extensions.cc:139] data (IN_BUF, JBYTE) ...
-Xplugin and -agentpath need to be used, otherwise the agent will fail during init.libartd.so, make sure to use the debug version of jvmti.
adb shell setenforce 0
adb push $ANDROID_PRODUCT_OUT/system/lib64/liblistextensions.so /data/local/tmp/
adb shell am start-activity --attach-agent /data/local/tmp/liblistextensions.so some.debuggable.apps/.the.app.MainActivity
java -agentpath:liblistextensions.so -cp tmp/helloworld/classes helloworld