Revert "[clang][dataflow] Retrieve members from accessors called usin…

…g member…" (#74299)

Reverts #73978

clang/lib/Analysis/FlowSensitive/DataflowEnvironment.cpp

@@ -300,12 +300,9 @@ static void insertIfFunction(const Decl &D,
 }
 
 static MemberExpr *getMemberForAccessor(const CXXMemberCallExpr &C) {
-  // Use getCalleeDecl instead of getMethodDecl in order to handle
-  // pointer-to-member calls.
-  const auto *MethodDecl = dyn_cast_or_null<CXXMethodDecl>(C.getCalleeDecl());
-  if (!MethodDecl)
+  if (!C.getMethodDecl())
     return nullptr;
-  auto *Body = dyn_cast_or_null<CompoundStmt>(MethodDecl->getBody());
+  auto *Body = dyn_cast_or_null<CompoundStmt>(C.getMethodDecl()->getBody());
   if (!Body || Body->size() != 1)
     return nullptr;
   if (auto *RS = dyn_cast<ReturnStmt>(*Body->body_begin()))

clang/unittests/Analysis/FlowSensitive/DataflowEnvironmentTest.cpp

@@ -25,7 +25,6 @@ namespace {
 using namespace clang;
 using namespace dataflow;
 using ::clang::dataflow::test::getFieldValue;
-using ::testing::Contains;
 using ::testing::IsNull;
 using ::testing::NotNull;
 
@@ -312,56 +311,6 @@ TEST_F(EnvironmentTest, InitGlobalVarsConstructor) {
   EXPECT_THAT(Env.getValue(*Var), NotNull());
 }
 
-// Pointers to Members are a tricky case of accessor calls, complicated further
-// when using templates where the pointer to the member is a template argument.
-// This is a repro of a failure case seen in the wild.
-TEST_F(EnvironmentTest,
-       ModelMemberForAccessorUsingMethodPointerThroughTemplate) {
-  using namespace ast_matchers;
-
-  std::string Code = R"cc(
-      struct S {
-        int accessor() {return member;}
-
-        int member = 0;
-      };
-
-      template <auto method>
-      int Target(S* S) {
-        return (S->*method)();
-      }
-
-     // We want to analyze the instantiation of Target for the accessor.
-     int Instantiator () {S S; return Target<&S::accessor>(&S); }
-  )cc";
-
-  auto Unit =
-      // C++17 for the simplifying use of auto in the template declaration.
-      tooling::buildASTFromCodeWithArgs(Code, {"-fsyntax-only", "-std=c++17"});
-  auto &Context = Unit->getASTContext();
-
-  ASSERT_EQ(Context.getDiagnostics().getClient()->getNumErrors(), 0U);
-
-  auto Results = match(
-      decl(anyOf(functionDecl(hasName("Target"), isTemplateInstantiation())
-                     .bind("target"),
-                 fieldDecl(hasName("member")).bind("member"),
-                 recordDecl(hasName("S")).bind("struct"))),
-      Context);
-  const auto *Fun = selectFirst<FunctionDecl>("target", Results);
-  const auto *Struct = selectFirst<RecordDecl>("struct", Results);
-  const auto *Member = selectFirst<FieldDecl>("member", Results);
-  ASSERT_THAT(Fun, NotNull());
-  ASSERT_THAT(Struct, NotNull());
-  ASSERT_THAT(Member, NotNull());
-
-  // Verify that `member` is modeled for `S` when we analyze
-  // `Target<&S::accessor>`.
-  Environment Env(DAContext, *Fun);
-  EXPECT_THAT(DAContext.getModeledFields(QualType(Struct->getTypeForDecl(), 0)),
-              Contains(Member));
-}
-
 TEST_F(EnvironmentTest, RefreshRecordValue) {
   using namespace ast_matchers;