diff --git a/clang/docs/LibASTMatchersReference.html b/clang/docs/LibASTMatchersReference.html
--- a/clang/docs/LibASTMatchersReference.html
+++ b/clang/docs/LibASTMatchersReference.html
@@ -4347,6 +4347,19 @@
 </pre></td></tr>
 
 
+<tr><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1FunctionDecl.html">FunctionDecl</a>&gt;</td><td class="name" onclick="toggle('isEffectivelyInline0')"><a name="isEffectivelyInline0Anchor">isEffectivelyInline</a></td><td></td></tr>
+<tr><td colspan="4" class="doc" id="isEffectivelyInline0"><pre>Matches function declarations that are either marked with
+the inline keyword or are implicitly inline.
+
+Given
+  class A {
+    void f() {}
+    void g();
+  };
+functionDecl(isEffectivelyInline()) will match ::f().
+</pre></td></tr>
+
+
 <tr><td>Matcher&lt;<a href="https://clang.llvm.org/doxygen/classclang_1_1FunctionDecl.html">FunctionDecl</a>&gt;</td><td class="name" onclick="toggle('isMain0')"><a name="isMain0Anchor">isMain</a></td><td></td></tr>
 <tr><td colspan="4" class="doc" id="isMain0"><pre>Determines whether the function is "main", which is the entry point
 into an executable program.
diff --git a/clang/include/clang/ASTMatchers/ASTMatchers.h b/clang/include/clang/ASTMatchers/ASTMatchers.h
--- a/clang/include/clang/ASTMatchers/ASTMatchers.h
+++ b/clang/include/clang/ASTMatchers/ASTMatchers.h
@@ -7777,6 +7777,21 @@
   llvm_unreachable("Not a valid polymorphic type");
 }
 
+/// Matches function declarations that are either marked with
+/// the inline keyword or are implicitly inline.
+///
+/// Given
+/// \code
+///   class A {
+///     void f() {}
+///     void g();
+///   };
+/// \endcode
+/// functionDecl(isEffectivelyInline()) will match f().
+AST_MATCHER(FunctionDecl, isEffectivelyInline) {
+  return Node.isInlined();
+}
+
 /// Matches anonymous namespace declarations.
 ///
 /// Given
diff --git a/clang/lib/ASTMatchers/Dynamic/Registry.cpp b/clang/lib/ASTMatchers/Dynamic/Registry.cpp
--- a/clang/lib/ASTMatchers/Dynamic/Registry.cpp
+++ b/clang/lib/ASTMatchers/Dynamic/Registry.cpp
@@ -432,6 +432,7 @@
   REGISTER_MATCHER(isInTemplateInstantiation);
   REGISTER_MATCHER(isInitCapture);
   REGISTER_MATCHER(isInline);
+  REGISTER_MATCHER(isEffectivelyInline);
   REGISTER_MATCHER(isInstanceMessage);
   REGISTER_MATCHER(isInstanceMethod);
   REGISTER_MATCHER(isInstantiated);
diff --git a/clang/unittests/ASTMatchers/ASTMatchersInternalTest.cpp b/clang/unittests/ASTMatchers/ASTMatchersInternalTest.cpp
--- a/clang/unittests/ASTMatchers/ASTMatchersInternalTest.cpp
+++ b/clang/unittests/ASTMatchers/ASTMatchersInternalTest.cpp
@@ -306,6 +306,13 @@
                       varDecl(isInline(), hasName("Foo")), {Lang_CXX17}));
 }
 
+TEST(IsInlineMatcher, IsEffectivelyInline) {
+  EXPECT_TRUE(matches("class X { void f() {} void g(); };",
+                      functionDecl(isEffectivelyInline(), hasName("f"))));
+  EXPECT_TRUE(matches("constexpr void f() {}",
+                      functionDecl(isEffectivelyInline(), hasName("f")), {Lang_CXX11}));
+}
+
 // FIXME: Figure out how to specify paths so the following tests pass on
 // Windows.
 #ifndef _WIN32