New AST matcher: gnuNullExpr

[eszasip]

Summary

Adding a new AST matcher that matches GNU __null expression.

[alexfh]

Manuel is a better reviewer for this. He'll probably want some tests for the new matcher.

[klimek]

+1, a test would be awesome - look at how we test other declarative node matchers...

[eszasip]

Added test for the matcher.

[klimek]

lg

[eszasip]

Committed in r236731.

In D9551#167855, @klimek wrote:

lg

Thanks.

include/clang/ASTMatchers/ASTMatchers.h

   Stmt,
   CXXNullPtrLiteralExpr> nullPtrLiteralExpr;
 
+/// \brief Matches GNU __null expression.
+const internal::VariadicDynCastAllOfMatcher<
+  Stmt,
+  GNUNullExpr> gnuNullExpr;
+
 /// \brief Matches binary operator expressions.
 ///
 /// Example matches a || b

unittests/ASTMatchers/ASTMatchersTest.cpp

   EXPECT_TRUE(matches("int* i = nullptr;", nullPtrLiteralExpr()));
 }
 
+TEST(Matcher, GNUNullExpr) {
+  EXPECT_TRUE(matches("int* i = __null;", gnuNullExpr()));
+}
+
 TEST(Matcher, AsmStatement) {
   EXPECT_TRUE(matches("void foo() { __asm(\"mov al, 2\"); }", asmStmt()));
 }