[Bug gprofng/30897] Support source view for "referenced" source (e.g. bison)

[bugmenot at mailinator dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30897

--- Comment #2 from John Doe <bugmenot at mailinator dot com> ---
Please also consider that (depending on the generator) some functions don't
"start" in their "real sources". Actually this is also the case for
QLParser.yy, where yylex is declared at line 42 but actually defined in the
generated C source.
This is also similar for other generators which may translate


orig.def
~~~
MACRO1(a(4),b)
MACRO2(c,d(3))
~~~

to

program.c
~~~
MACRO1_
{
 int a;
 int b;
#line orig.def 1
 a = 4; b = (somefunc(a);
#line program.c 8
 assert (a == b);
}

MACRO02_
{
 int c;
 int d = 3:
#line orig.def 2
 c = otherfunc(d);
#line program.c 18
 assert (d == -c);
}
~~~

As the program.c file is generated its profiling is only minor interesting, but
it will be very good to have orig.def in the profiler (it is visible in GDB and
coredumps, too).

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