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[XRay] Define the library for XRay trace logs

Authored by dberris on Jan 10 2017, 10:39 PM.

Description

[XRay] Define the library for XRay trace logs

Summary:
In this change we move the definition of the log reading routines from
the tools directory in LLVM to {include/llvm,lib}/XRay. We improve the
documentation a little bit for the publicly accessible headers, and
adjust the top-matter. This also leads to some refactoring and cleanup
in the tooling code.

In particular, we do the following:

  • Rename the class from LogReader to Trace, as it better represents the logical set of records as opposed to a log.
  • Use file type detection instead of asking the user to say what format the input file is. This allows us to keep the interface simple and encapsulate the logic of loading the data appropriately.

In future changes we increase the API surface and write dedicated unit
tests for the XRay library.

Depends on D24376.

Reviewers: dblaikie, echristo

Subscribers: mehdi_amini, mgorny, llvm-commits, varno

Differential Revision: https://reviews.llvm.org/D28345

llvm-svn: 291652