[clang][ASTMatcher] Fix execution order of hasOperands submatchers

clang/docs/ReleaseNotes.rst

@@ -350,6 +350,9 @@ AST Matchers
 - Fixed an issue with the `hasName` and `hasAnyName` matcher when matching
   inline namespaces with an enclosing namespace of the same name.
 
+- Fixed an ordering issue with the `hasOperands` matcher occuring when setting a
+  binding in the first matcher and using it in the second matcher.
+
 clang-format
 ------------
 

clang/include/clang/ASTMatchers/ASTMatchers.h

@@ -6027,7 +6027,7 @@ AST_POLYMORPHIC_MATCHER_P2(
     internal::Matcher<Expr>, Matcher1, internal::Matcher<Expr>, Matcher2) {
   return internal::VariadicDynCastAllOfMatcher<Stmt, NodeType>()(
              anyOf(allOf(hasLHS(Matcher1), hasRHS(Matcher2)),
-                   allOf(hasLHS(Matcher2), hasRHS(Matcher1))))
+                   allOf(hasRHS(Matcher1), hasLHS(Matcher2))))
       .matches(Node, Finder, Builder);
 }
 

clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp

@@ -1745,6 +1745,18 @@ TEST(MatchBinaryOperator, HasOperands) {
   EXPECT_TRUE(notMatches("void x() { 0 + 1; }", HasOperands));
 }
 
+TEST(MatchBinaryOperator, HasOperandsEnsureOrdering) {
+  StatementMatcher HasOperandsWithBindings = binaryOperator(hasOperands(
+      cStyleCastExpr(has(declRefExpr(hasDeclaration(valueDecl().bind("d"))))),
+      declRefExpr(hasDeclaration(valueDecl(equalsBoundNode("d"))))));
+  EXPECT_TRUE(matches(
+      "int a; int b = ((int) a) + a;",
+      traverse(TK_IgnoreUnlessSpelledInSource, HasOperandsWithBindings)));
+  EXPECT_TRUE(matches(
+      "int a; int b = a + ((int) a);",
+      traverse(TK_IgnoreUnlessSpelledInSource, HasOperandsWithBindings)));
+}
+
 TEST(Matcher, BinaryOperatorTypes) {
   // Integration test that verifies the AST provides all binary operators in
   // a way we expect.