llvm dev - Dec 2016 - [Repost] Obtaining the actual size of BBs in bytes and the number of fixups per each BB

​Hello,

I want to obtain the following information at each object file during
compilation, and store them into the new section that I define. Currently
the target architecture is x86_64 with ELF format.


*a) actual size of basic blocks in bytes to be emitted *
*b) number of fixups that belong to each basic block*

By the time of emitting the actual bytes, I could only see the unit of the
fragment without the boundary of functions and basic blocks. In general,
what is the best strategy to get the info from frontend at backend if
necessary?

Thanks a lot for your help in advance!

​Kevin
Koo
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