[PATCH] D49840: [AST] Add MatchFinder::matchSubtree

[Gabor Marton via Phabricator via cfe-commits]

martong created this revision.
martong added reviewers: klimek, aprantl, pcc, sbenza, Prazek, dblaikie, balazske, xazax.hun.
Herald added subscribers: cfe-commits, dkrupp, rnkovacs.

Add matchSubtree, so we can traverse on a subtree rooted on a specific node.

Currently, we can match **one** node against a matcher, but we will not traverse
into the children (this is MatchFinder::match).
Or we can traverse through the whole tree rooted at the TUDecl (this
is MatchFinder::matchAST).
Note, findAll may provide an alternative, but that will traverse throught the
whole AST, and that has some weaknesses:
https://bugs.llvm.org/show_bug.cgi?id=38318


Repository:
  rC Clang

https://reviews.llvm.org/D49840

Files:
  include/clang/ASTMatchers/ASTMatchFinder.h
  lib/ASTMatchers/ASTMatchFinder.cpp
  unittests/ASTMatchers/ASTMatchersInternalTest.cpp

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