Add parameterCountIs() matcher.

llvm-svn: 169257

2 files changed, 21 insertions, 0 deletions

diff --git a/clang/include/clang/ASTMatchers/ASTMatchers.h b/clang/include/clang/ASTMatchers/ASTMatchers.h
index a70dd5c378b..71ce10f8932 100644
--- a/clang/include/clang/ASTMatchers/ASTMatchers.h
+++ b/clang/include/clang/ASTMatchers/ASTMatchers.h
@@ -1974,6 +1974,19 @@ AST_MATCHER_P(FunctionDecl, hasAnyParameter,
   return false;
 }
 
+/// \brief Matches \c FunctionDecls that have a specific parameter count.
+///
+/// Given
+/// \code
+///   void f(int i) {}
+///   void g(int i, int j) {}
+/// \endcode
+/// functionDecl(parameterCountIs(2))
+///   matches g(int i, int j) {}
+AST_MATCHER_P(FunctionDecl, parameterCountIs, unsigned, N) {
+  return Node.getNumParams() == N;
+}
+
 /// \brief Matches the return type of a function declaration.
 ///
 /// Given:
diff --git a/clang/unittests/ASTMatchers/ASTMatchersTest.cpp b/clang/unittests/ASTMatchers/ASTMatchersTest.cpp
index ad072aa7ce3..f3d377b771f 100644
--- a/clang/unittests/ASTMatchers/ASTMatchersTest.cpp
+++ b/clang/unittests/ASTMatchers/ASTMatchersTest.cpp
@@ -1238,6 +1238,14 @@ TEST(Matcher, ArgumentCount) {
   EXPECT_TRUE(notMatches("void x(int, int) { x(0, 0); }", Call1Arg));
 }
 
+TEST(Matcher, ParameterCount) {
+  DeclarationMatcher Function1Arg = functionDecl(parameterCountIs(1));
+  EXPECT_TRUE(matches("void f(int i) {}", Function1Arg));
+  EXPECT_TRUE(matches("class X { void f(int i) {} };", Function1Arg));
+  EXPECT_TRUE(notMatches("void f() {}", Function1Arg));
+  EXPECT_TRUE(notMatches("void f(int i, int j, int k) {}", Function1Arg));
+}
+
 TEST(Matcher, References) {
   DeclarationMatcher ReferenceClassX = varDecl(
       hasType(references(recordDecl(hasName("X")))));