Hi,
your right: JaCoCo inserts probes in a way that we know the execution
status of every branch on the byte code level.
The tricky part is to map this back to source code. Remember: JaCoCo
does not use source code for analysis. If jump targets are in a
different line, this might in fact give an idea to the user ("jump
target to line 7 not executed").
If we have multiple conditions in the same line things get more tricky:
a() && b() && c()
How would we give users some hint in this situation?
Cheers,
-marc
On 2017-11-15 11:02, scarlet wrote:
> Thank you for your answer!
>
> But I am confused with a problem: We can get the probs information(in
> executing data)
>
> and the class file. So if I write something to find where is the probs in the
> class file,
>
> would I get the information that I want?
>
> For example, here is the code:
>
> public int greaterThen(int intOne, int intTwo) {
>
> if (intOne > intTwo) {
>
> return 0;
>
> } else {
>
> return 1;
>
> }
>
> }
>
> And when it comes to bytecode:
>
> 0: iload_1
>
> 1: iload_2
>
> 2: if_icmple 7
>
> 5: iconst_0
>
> 6: ireturn
>
> 7: iconst_1
>
> 8: ireturn
>
> If JaCoCo insert the prob between the 5 and 6 , for example prob[5] in the
> executing data
>
> Without considering the efficiency, can I finally check the class file and
> find the prob[5] is
>
> between the 5 and 6, then backstepping to find that the java code execute
> "return 0"
>
> and we miss the branch"intOne<=intTwo" ?
>
> Just an idea, and hope for your reply.
>
> Thank you!
>
> 发件人: Marc Hoffmann
> 发送时间: 2017年11月14日 19:46
> 收件人: [email protected]
> 主题: Re: [java code coverage] Can we know the details about the branchcoverage
> by JaCoCo?
>
> Hi,
>
> short answer: JaCoCo does not provide this information.
>
> JaCoCo is fully based on Java class files (bytecode). The only mapping
>
> back to source are the line numbers contained with the debug
>
> information. Within a line we cannot differentiate what exactly has been
>
> executed.
>
> In OpenJDK there is a experimental flag which provides more fine-grain
>
> mapping. We created a POC using this extra information:
>
> https://github.com/jacoco/jacoco/pull/317
>
> As a workaround you might break complex conditions in multiple lines.
>
> Regards,
>
> -marc
>
> On 2017-11-14 09:19, [email protected] wrote:
>
>> Hello.
>
>>
>
>> I found that if a branch was missed, only a yellow bolck was be shown
>
>> and said "1 of 2 branches missed." or other words like this.
>
>>
>
>> However, could we know some details about it? Such as "1 of 4 branches
>
>> missed. True/False/True/True"?
>
>>
>
>> In other words, is there any possiblity to konw which side of the
>
>> branch have been executed?
>
>>
>
>> Thanks!
>
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