Commits on Dec 30, 2018

1. Add -Z instrument-mcount …

   This flag inserts `mcount` function call to the beginning of every function
   after inline processing. So tracing tools like uftrace [1] (or ftrace for
   Linux kernel modules) have a chance to examine function calls.
   
   It is similar to the `-pg` flag provided by gcc or clang, but without
   generating a `__gmon_start__` function for executables. If a program
   runs without being traced, no `gmon.out` will be written to disk.
   
   Under the hood, it simply adds `"instrument-function-entry-inlined"="mcount"`
   attribute to every function. The `post-inline-ee-instrument` LLVM pass does
   the actual job.
   
   [1]: https://github.com/namhyung/uftrace

   

   quark-zju committed Dec 30, 2018
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