[PATCH] D42273: Add hasTrailingReturn AST matcher

[Julie Hockett via Phabricator via cfe-commits]

juliehockett created this revision.
juliehockett added a reviewer: aaron.ballman.
Herald added a subscriber: klimek.

Adds AST matcher for a FunctionDecl that has a trailing return type.


https://reviews.llvm.org/D42273

Files:
  docs/LibASTMatchersReference.html
  include/clang/ASTMatchers/ASTMatchers.h
  lib/ASTMatchers/Dynamic/Registry.cpp
  unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp


Index: unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
===================================================================
--- unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
+++ unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
@@ -2112,5 +2112,14 @@
   EXPECT_TRUE(notMatches("enum X {};", enumDecl(isScoped())));
 }
 
+TEST(HasTrailingReturn, MatchesTrailingReturn) {
+  EXPECT_TRUE(matches("auto Y() -> int {};",
+                      functionDecl(hasTrailingReturn())));
+  EXPECT_TRUE(matches(
+          "auto lambda2 = [](double x, double y) -> double {return x + y;};",
+          functionDecl(hasTrailingReturn())));
+  EXPECT_TRUE(notMatches("int X() {};", functionDecl(hasTrailingReturn())));
+}
+
 } // namespace ast_matchers
 } // namespace clang
Index: lib/ASTMatchers/Dynamic/Registry.cpp
===================================================================
--- lib/ASTMatchers/Dynamic/Registry.cpp
+++ lib/ASTMatchers/Dynamic/Registry.cpp
@@ -296,6 +296,7 @@
   REGISTER_MATCHER(hasTemplateArgument);
   REGISTER_MATCHER(hasThen);
   REGISTER_MATCHER(hasThreadStorageDuration);
+  REGISTER_MATCHER(hasTrailingReturn);
   REGISTER_MATCHER(hasTrueExpression);
   REGISTER_MATCHER(hasTypeLoc);
   REGISTER_MATCHER(hasUnaryOperand);
Index: include/clang/ASTMatchers/ASTMatchers.h
===================================================================
--- include/clang/ASTMatchers/ASTMatchers.h
+++ include/clang/ASTMatchers/ASTMatchers.h
@@ -5891,6 +5891,17 @@
   return Node.isScoped();
 }
 
+/// \brief Matches a function declared with a trailing return type.
+///
+/// Example matches Y (matcher = functionDecl(hasTrailingReturn()))
+/// \code
+/// int X() {};
+/// auto Y() -> int {};
+/// \endcode
+AST_MATCHER(FunctionDecl, hasTrailingReturn) {
+  return Node.getType()->castAs<FunctionProtoType>()->hasTrailingReturn();
+}
+
 } // namespace ast_matchers
 } // namespace clang
 
Index: docs/LibASTMatchersReference.html
===================================================================
--- docs/LibASTMatchersReference.html
+++ docs/LibASTMatchersReference.html
@@ -2749,6 +2749,15 @@
 </pre></td></tr>
 
 
+<tr><td>Matcher<<a href="http://clang.llvm.org/doxygen/classclang_1_1FunctionDecl.html">FunctionDecl</a>></td><td class="name" onclick="toggle('hasTrailingReturn0')"><a name="hasTrailingReturn0Anchor">hasTrailingReturn</a></td><td></td></tr>
+<tr><td colspan="4" class="doc" id="hasTrailingReturn0"><pre>Matches a function declared with a trailing return type.
+
+Example matches Y (matcher = functionDecl(hasTrailingReturn()))
+int X() {};
+auto Y() -> int {};
+</pre></td></tr>
+
+
 <tr><td>Matcher<<a href="http://clang.llvm.org/doxygen/classclang_1_1FunctionDecl.html">FunctionDecl</a>></td><td class="name" onclick="toggle('isConstexpr1')"><a name="isConstexpr1Anchor">isConstexpr</a></td><td></td></tr>
 <tr><td colspan="4" class="doc" id="isConstexpr1"><pre>Matches constexpr variable and function declarations.
 


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