[PATCH] D24479: [YAML] Add basic support for class hierarchies

[Adam Nemet via llvm-commits]

anemet created this revision.
anemet added reviewers: kledzik, hfinkel.
anemet added a subscriber: llvm-commits.

Looks like that with some minimal generalization of mapTag, we can
support inheritance in YAML I/O.  In the new testcase I modified the
previous tagging example to actually store the underlying implementation
(decimal vs. fraction) in the YAML output.

I am thinking of using this pattern to produce the YAML output for
optimization remarks (see, https://reviews.llvm.org/D19678#419445).  The
relevant part of the optimization remark hierarchy starts at
DiagnosticInfoOptimizationBase
(http://llvm.org/doxygen/classllvm_1_1DiagnosticInfoOptimizationBase.html)

https://reviews.llvm.org/D24479

Files:
  include/llvm/Support/YAMLTraits.h
  lib/Support/YAMLTraits.cpp
  unittests/Support/YAMLIOTest.cpp

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