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Update user's manual documentation of profile remapping file to match 

llvm-cxxmap documentation.

Add a hint as to how to perform off-line profile data remapping.

llvm-svn: 344319
This commit is contained in:
Richard Smith 2018-10-11 23:48:11 +00:00
parent c7efb6f990
commit df398bd5fe
1 changed files with 8 additions and 5 deletions
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13
clang/docs/UsersManual.rst
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@ -1831,13 +1831,15 @@ The profile remapping file is a text file containing lines of the form
where ``fragmentkind`` is one of ``name``, ``type``, or ``encoding``,
indicating whether the following mangled name fragments are
<`name <http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.name>`>s,
<`type <http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.type>`>s, or
<`encoding <http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.encoding>`>s,
<`name <http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.name>`_>s,
<`type <http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.type>`_>s, or
<`encoding <http://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangle.encoding>`_>s,
respectively.
Blank lines and lines starting with ``#`` are ignored.
For convenience, built-in <substitution>s such as ``St`` and ``Ss``
are accepted as <name>s (even though they technically are not <name>s).
For example, to specify that ``absl::string_view`` and ``std::string_view``
should be treated as equivalent when matching profile data, the following
remapping file could be used:
@ -1854,7 +1856,8 @@ remapping file could be used:
Matching profile data using a profile remapping file is supported on a
best-effort basis. For example, information regarding indirect call targets is
currently not remapped. For best results, you are encouraged to generate new
profile data matching the updated program.
profile data matching the updated program, or to remap the profile data
using the ``llvm-cxxmap`` and ``llvm-profdata merge`` tools.
.. note::