down votefavorite <http://stackoverflow.com/questions/39134924/how-to-instrument-android-dalvik-compiler#> I need to instrument Android 4.3 Dalvik compiler <https://android.googlesource.com/platform/dalvik/+/android-4.3.1_r1/vm/mterp/> for some purposes. *What is the goal?* The goal is to calculate the elapsed execution time used by assignment statements in the Android Dalvik VM code. *What did I do so far?* I insert the following code between assignment statement(s) in the Android Dalvik VM source code: start = get_time() <assignment statements> end = end_time() elapsed_time = end-start *Why the above code does not work?* The above code does not work for the following reasons: 1. The get_time() function, more specifically *gettimeofday()* or *clock_gettime()*, has higher resolution than the assignment statement and hence gives negative values. 2. To solve the negative values above, I end up using a for-loop to loop 1 billion times for each code that has assignment statements. However, the Android code becomes extremely slow and does not work. *What do I need to do to solve the problem?* I need to instrument the Dalvik compiler to identify the assignment instructions and calculate/estimate their execution times at the compile-time (not at run-time). Does anyone know how to do that? -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/android-developers. To view this discussion on the web visit https://groups.google.com/d/msgid/android-developers/617da8a8-dcd5-4c4c-9191-01c73d1ebec3%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
