New AST matcher: isConstexpr()

[eszasip]

Summary

Adding a new AST matcher that matches constexpr function declarations.

[klimek]

include/clang/ASTMatchers/ASTMatchers.h

2712

If we add it, why not add it for VarDecl, too? :)

[eszasip]

From now on isConstexpr() matches constexpr VarDecls as well.

[klimek]

LG, thx. Let me know if you need me to submit it.

[eszasip]

Committed in r238016.

include/clang/ASTMatchers/ASTMatchers.h

   return Node.isDeleted();
 }
 
+/// \brief Matches constexpr function declarations.
+///
+/// Given:
+/// \code
+///   int foo();
+///   constexpr int bar();
+/// \endcode
+/// functionDecl(isConstexpr())
+///   matches the declaration of bar, but not foo.
+AST_MATCHER(FunctionDecl, isConstexpr) {
+  return Node.isConstexpr();
+}
+
 /// \brief Matches the condition expression of an if statement, for loop,
 /// or conditional operator.
 ///

unittests/ASTMatchers/ASTMatchersTest.cpp

                       functionDecl(hasName("Func"), isDeleted())));
 }
 
+TEST(isConstexpr, MatchesConstexprFunctionDeclarations) {
+  EXPECT_TRUE(notMatches("int foo();",
+                      functionDecl(hasName("foo"), isConstexpr())));
+  EXPECT_TRUE(matches("constexpr int bar();",
+                      functionDecl(hasName("bar"), isConstexpr())));
+}
+
 TEST(HasAnyParameter, DoesntMatchIfInnerMatcherDoesntMatch) {
   EXPECT_TRUE(notMatches("class Y {}; class X { void x(int) {} };",
       methodDecl(hasAnyParameter(hasType(recordDecl(hasName("X")))))));