[StructuralEquivalence] improve NTTP and CXXDependentScopeMemberExpr comparison (#95190)

improve `ASTStructuralEquivalenceTest`:

1. compare the depth and index of NTTP
2. provide comparison of `CXXDependentScopeMemberExpr` to `StmtCompare`.

Co-authored-by: huqizhi <836744285@qq.com>

1 files changed, 55 insertions, 2 deletions

diff --git a/clang/unittests/AST/StructuralEquivalenceTest.cpp b/clang/unittests/AST/StructuralEquivalenceTest.cpp
index 91dd717..952c83b 100644
--- a/clang/unittests/AST/StructuralEquivalenceTest.cpp
+++ b/clang/unittests/AST/StructuralEquivalenceTest.cpp
@@ -1877,6 +1877,34 @@ TEST_F(StructuralEquivalenceCacheTest, VarDeclWithDifferentStorageClassNoEq) {
   EXPECT_FALSE(Ctx.IsEquivalent(Var.first, Var.second));
 }
 
+TEST_F(StructuralEquivalenceCacheTest,
+       NonTypeTemplateParmWithDifferentPositionNoEq) {
+  auto TU = makeTuDecls(
+      R"(
+      template<int T>
+      struct A {
+        template<int U>
+        void foo() {}
+      };
+      )",
+      R"(
+      template<int U>
+      struct A {
+        template<int V, int T>
+        void foo() {}
+      };
+      )",
+      Lang_CXX03);
+
+  StructuralEquivalenceContext Ctx(
+      get<0>(TU)->getASTContext(), get<1>(TU)->getASTContext(),
+      NonEquivalentDecls, StructuralEquivalenceKind::Default, false, false);
+
+  auto NTTP = findDeclPair<NonTypeTemplateParmDecl>(
+      TU, nonTypeTemplateParmDecl(hasName("T")));
+  EXPECT_FALSE(Ctx.IsEquivalent(NTTP.first, NTTP.second));
+}
+
 TEST_F(StructuralEquivalenceCacheTest, VarDeclWithInitNoEq) {
   auto TU = makeTuDecls(
       R"(
@@ -2441,8 +2469,7 @@ TEST_F(StructuralEquivalenceStmtTest, NonTypeTemplateParm) {
       void foo(A<T, y>);
       )",
       Lang_CXX11);
-  // FIXME: These should not match,
-  EXPECT_TRUE(testStructuralMatch(t));
+  EXPECT_FALSE(testStructuralMatch(t));
 }
 
 TEST_F(StructuralEquivalenceStmtTest, UnresolvedLookupDifferentName) {
@@ -2595,5 +2622,31 @@ TEST_F(StructuralEquivalenceStmtTest, DeclRefExpr) {
   EXPECT_FALSE(testStructuralMatch(t));
 }
 
+TEST_F(StructuralEquivalenceCacheTest, CXXDependentScopeMemberExprNoEq) {
+  auto S = makeStmts(
+      R"(
+      template <class T>
+      void foo() {
+        (void)T().x;
+      }
+      struct A { int x; };
+      void bar() {
+        foo<A>();
+      }
+      )",
+      R"(
+      template <class T>
+      void foo() {
+        (void)T().y;
+      }
+      struct A { int y; };
+      void bar() {
+        foo<A>();
+      }
+      )",
+      Lang_CXX11, cxxDependentScopeMemberExpr());
+  EXPECT_FALSE(testStructuralMatch(S));
+}
+
 } // end namespace ast_matchers
 } // end namespace clang