how probe array assign for runtime data

[winter]

I debug the CoreTutorial.java step by step

final Runnable targetInstance = (Runnable) targetClass.newInstance();
targetInstance.run();

when these lines were executed, it means our test target was executed, then I noticed the value of probe arrays in variable store in class RuntimeData changed, like [true,true,true,false,true,true], how it works? I didn't find how the RuntimeData value been changed

[Marc Hoffmann]

Hi,

the target class gets “instrumented”. I.e. additional bytecode instructions are inserted which set the respective boolean flags in the runtime data.

Regards,

-marc

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[winter]

thank u for reply, which instructions do this? I found jacocoinit method use Logger.log(Level level, String msg, Object params[]) and custom Handler to report the boolean array, but jacocoinit was called at first line in a method, the target class was not executed, so it report the fully false boolean array

[Marc Hoffmann]

Hi, 

probe insertion is documented here:

https://www.jacoco.org/jacoco/trunk/doc/flow.html

Regards,

-marc

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[winter]

thank u, is the document introduced how the boolean flags set in  runtime data ?

[Marc Hoffmann]

Yes, the inserted probes are described in the same link (section “Probe Implementation”).

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