Introduces the 'decl' matcher which was missing for a while

and became necessary with the change to require BindableMatchers
for binding.

Also fixes PR 13445: "hasSourceExpression only works for implicit casts".

llvm-svn: 160716

clang/include/clang/ASTMatchers/ASTMatchers.h

@@ -130,6 +130,17 @@ inline internal::PolymorphicMatcherWithParam0<internal::TrueMatcher> anything()
   return internal::PolymorphicMatcherWithParam0<internal::TrueMatcher>();
 }
 
+/// \brief Matches declarations.
+///
+/// Examples matches \c X, \c C, and the friend declaration inside \c C;
+/// \code
+///   void X();
+///   class C {
+///     friend X;
+///   };
+/// \endcode
+const internal::VariadicDynCastAllOfMatcher<Decl, Decl> decl;
+
 /// \brief Matches a declaration of anything that could have a name.
 ///
 /// Example matches X, S, the anonymous union type, i, and U;
@@ -1549,15 +1560,14 @@ AST_MATCHER_P(UnaryOperator, hasUnaryOperand,
           InnerMatcher.matches(*Operand, Finder, Builder));
 }
 
-/// \brief Matches if the implicit cast's source expression matches the given
-/// matcher.
+/// \brief Matches if the cast's source expression matches the given matcher.
 ///
 /// Example: matches "a string" (matcher =
 ///                                  hasSourceExpression(constructorCall()))
 ///
 /// class URL { URL(string); };
 /// URL url = "a string";
-AST_MATCHER_P(ImplicitCastExpr, hasSourceExpression,
+AST_MATCHER_P(CastExpr, hasSourceExpression,
               internal::Matcher<Expr>, InnerMatcher) {
   const Expr* const SubExpression = Node.getSubExpr();
   return (SubExpression != NULL &&

clang/unittests/ASTMatchers/ASTMatchersTest.cpp

@@ -39,6 +39,12 @@ TEST(IsDerivedFromDeathTest, DiesOnEmptyBaseName) {
 }
 #endif
 
+TEST(Decl, MatchesDeclarations) {
+  EXPECT_TRUE(notMatches("", decl(usingDecl())));
+  EXPECT_TRUE(matches("namespace x { class X {}; } using x::X;",
+                      decl(usingDecl())));
+}
+
 TEST(NameableDeclaration, MatchesVariousDecls) {
   DeclarationMatcher NamedX = nameableDeclaration(hasName("X"));
   EXPECT_TRUE(matches("typedef int X;", NamedX));
@@ -2037,13 +2043,20 @@ TEST(HasDestinationType, MatchesSimpleCase) {
                               pointsTo(TypeMatcher(anything())))))));
 }
 
-TEST(HasSourceExpression, MatchesSimpleCase) {
+TEST(HasSourceExpression, MatchesImplicitCasts) {
   EXPECT_TRUE(matches("class string {}; class URL { public: URL(string s); };"
                       "void r() {string a_string; URL url = a_string; }",
                       expression(implicitCast(
                           hasSourceExpression(constructorCall())))));
 }
 
+TEST(HasSourceExpression, MatchesExplicitCasts) {
+  EXPECT_TRUE(matches("float x = static_cast<float>(42);",
+                      expression(explicitCast(
+                        hasSourceExpression(hasDescendant(
+                          expression(integerLiteral())))))));
+}
+
 TEST(Statement, DoesNotMatchDeclarations) {
   EXPECT_TRUE(notMatches("class X {};", statement()));
 }