Gcov Internals

[Sebastian Roland <seroland86 at gmail dot com>]

Hi,

I am currently trying to understand the internals of Gcov. Specifically 
I am wondering of the following:

1) Certain Basic Blocks are instrumented with counters that are 
incremented during execution. During compilation a destructor is 
registered that actually goes through a gcov_info struct and finds all 
counters in the appropriate gcov_fn_info struct(s). My question is how 
(and where in the source code) do the references to the various counters 
are linked to the gcov_info struct?

2) What exactly is the purpose of the constructor (__gcov_init()) and 
where are the values of the passed gcov_info struct set (probably 
related to 1)?

--Sebastian

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