Add matcher for float literals.

Patch by Chris Gray! Thanks!

llvm-svn: 187232

clang/include/clang/ASTMatchers/ASTMatchers.h

@@ -1069,15 +1069,25 @@ const internal::VariadicDynCastAllOfMatcher<
   Stmt,
   CharacterLiteral> characterLiteral;
 
-/// \brief Matches integer literals of all sizes / encodings.
+/// \brief Matches integer literals of all sizes / encodings, e.g.
+/// 1, 1L, 0x1 and 1U.
 ///
-/// Not matching character-encoded integers such as L'a'.
-///
-/// Example matches 1, 1L, 0x1, 1U
+/// Does not match character-encoded integers such as L'a'.
 const internal::VariadicDynCastAllOfMatcher<
   Stmt,
   IntegerLiteral> integerLiteral;
 
+/// \brief Matches float literals of all sizes / encodings, e.g.
+/// 1.0, 1.0f, 1.0L and 1e10.
+///
+/// Does not match implicit conversions such as
+/// \code
+///   float a = 10;
+/// \endcode
+const internal::VariadicDynCastAllOfMatcher<
+  Stmt,
+  FloatingLiteral> floatLiteral;
+
 /// \brief Matches user defined literal operator call.
 ///
 /// Example match: "foo"_suffix

clang/lib/ASTMatchers/Dynamic/Registry.cpp

@@ -252,6 +252,7 @@ RegistryMaps::RegistryMaps() {
   REGISTER_MATCHER(explicitCastExpr);
   REGISTER_MATCHER(expr);
   REGISTER_MATCHER(fieldDecl);
+  REGISTER_MATCHER(floatLiteral);
   REGISTER_MATCHER(forField);
   REGISTER_MATCHER(forRangeStmt);
   REGISTER_MATCHER(forStmt);

clang/unittests/ASTMatchers/ASTMatchersTest.cpp

@@ -1853,6 +1853,17 @@ TEST(Matcher, IntegerLiterals) {
   EXPECT_TRUE(notMatches("int i = 10.0;", HasIntLiteral));
 }
 
+TEST(Matcher, FloatLiterals) {
+  StatementMatcher HasFloatLiteral = floatLiteral();
+  EXPECT_TRUE(matches("float i = 10.0;", HasFloatLiteral));
+  EXPECT_TRUE(matches("float i = 10.0f;", HasFloatLiteral));
+  EXPECT_TRUE(matches("double i = 10.0;", HasFloatLiteral));
+  EXPECT_TRUE(matches("double i = 10.0L;", HasFloatLiteral));
+  EXPECT_TRUE(matches("double i = 1e10;", HasFloatLiteral));
+
+  EXPECT_TRUE(notMatches("float i = 10;", HasFloatLiteral));
+}
+
 TEST(Matcher, NullPtrLiteral) {
   EXPECT_TRUE(matches("int* i = nullptr;", nullPtrLiteralExpr()));
 }