A flawed BTrace script to record all object allocations

AllAllocationsTogglable.java

package btraces;

import com.sun.btrace.annotations.*;

import static com.sun.btrace.BTraceUtils.*;

@BTrace
public class AllAllocationsTogglable {

    @TLS private static boolean enabled = false;


    @OnMethod(
            clazz="java.lang.System",
            method="setProperty"
    )
    public static void onSetProperty(String key, String value) {
        if (Strings.compareTo("tracerino.allAllocations", key) != 0)
            return;

        if (Strings.compareTo("0", value) == 0) {
            enabled = false;

            String traceTag = Sys.Env.property("tracerino.allAllocations");
            print("AllAllocations: disabling <");
            print(traceTag);
            println('>');
            return;
        }

        enabled = true;
        print("AllAllocations: enabling <");
        print(value);
        println('>');
    }

    @OnMethod(clazz="+java.lang.Object",
              method="<init>")
    public static void onNewThing(@Self Object o,
                                  @ProbeClassName String pcn) {
        if (!enabled)
            return;

        Class objectClass = Reflective.classOf(o);
        String objectClassString = Reflective.name(objectClass);

        if (Strings.compareTo(pcn, objectClassString) == 0) {
            print(pcn);
            print('\t');
            println(Strings.str(sizeof(o)));
        }
    }
}

Amongst other things, one pretty big flaw is that it doesn't instrument constructors that take arguments (which might be fixable).

Hi Eli Zor,

Thanks for providing this awesome script, according to btraceio/btrace#252, you made some modification on Feb 2017, could u please provide updated version of this script?

My task is use Btrace to track big object allocation and its stacktrace.

Really appreciated ur help in advance!

Thanks,
Roy