Make isExternC work on VarDecls too.

llvm-svn: 277712

3 files changed, 20 insertions, 1 deletions

diff --git a/clang/docs/LibASTMatchersReference.html b/clang/docs/LibASTMatchersReference.html
index 35534cb8c84..02af5d578f6 100644
--- a/clang/docs/LibASTMatchersReference.html
+++ b/clang/docs/LibASTMatchersReference.html
@@ -3441,6 +3441,18 @@ Usable as: Matcher&lt;<a href="http://clang.llvm.org/doxygen/classclang_1_1Funct
 </pre></td></tr>
 
 
+<tr><td>Matcher&lt;<a href="http://clang.llvm.org/doxygen/classclang_1_1VarDecl.html">VarDecl</a>&gt;</td><td class="name" onclick="toggle('isExternC1')"><a name="isExternC1Anchor">isExternC</a></td><td></td></tr>
+<tr><td colspan="4" class="doc" id="isExternC1"><pre>Matches extern "C" function declarations.
+
+Given:
+  extern "C" void f() {}
+  extern "C" { void g() {} }
+  void h() {}
+functionDecl(isExternC())
+  matches the declaration of f and g, but not the declaration h
+</pre></td></tr>
+
+
 <tr><td>Matcher&lt;<a href="http://clang.llvm.org/doxygen/classclang_1_1VarDecl.html">VarDecl</a>&gt;</td><td class="name" onclick="toggle('isTemplateInstantiation1')"><a name="isTemplateInstantiation1Anchor">isTemplateInstantiation</a></td><td></td></tr>
 <tr><td colspan="4" class="doc" id="isTemplateInstantiation1"><pre>Matches template instantiations of function, class, or static
 member variable template instantiations.
diff --git a/clang/include/clang/ASTMatchers/ASTMatchers.h b/clang/include/clang/ASTMatchers/ASTMatchers.h
index eee713c49b8..2a5f0470766 100644
--- a/clang/include/clang/ASTMatchers/ASTMatchers.h
+++ b/clang/include/clang/ASTMatchers/ASTMatchers.h
@@ -3342,7 +3342,8 @@ AST_MATCHER_P(FunctionDecl, returns,
 /// \endcode
 /// functionDecl(isExternC())
 ///   matches the declaration of f and g, but not the declaration h
-AST_MATCHER(FunctionDecl, isExternC) {
+AST_POLYMORPHIC_MATCHER(isExternC, AST_POLYMORPHIC_SUPPORTED_TYPES(FunctionDecl,
+                                                                   VarDecl)) {
   return Node.isExternC();
 }
 
diff --git a/clang/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp b/clang/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
index 82c5139a78f..108fd435cef 100644
--- a/clang/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
+++ b/clang/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp
@@ -842,6 +842,12 @@ TEST(IsExternC, MatchesExternCFunctionDeclarations) {
   EXPECT_TRUE(notMatches("void f() {}", functionDecl(isExternC())));
 }
 
+TEST(IsExternC, MatchesExternCVariableDeclarations) {
+  EXPECT_TRUE(matches("extern \"C\" int i;", varDecl(isExternC())));
+  EXPECT_TRUE(matches("extern \"C\" { int i; }", varDecl(isExternC())));
+  EXPECT_TRUE(notMatches("int i;", varDecl(isExternC())));
+}
+
 TEST(IsDefaulted, MatchesDefaultedFunctionDeclarations) {
   EXPECT_TRUE(notMatches("class A { ~A(); };",
                          functionDecl(hasName("~A"), isDefaulted())));