[clang][dataflow] Bail out if input is Objective-C++. (#86479)

We only ever intended to support C++, but the condition we were testing
allowed
Objective-C++ code by mistake.

Author: martinboehme

clang/lib/Analysis/FlowSensitive/AdornedCFG.cpp

@@ -144,7 +144,7 @@ llvm::Expected<AdornedCFG> AdornedCFG::build(const Decl &D, Stmt &S,
 
   // The shape of certain elements of the AST can vary depending on the
   // language. We currently only support C++.
-  if (!C.getLangOpts().CPlusPlus)
+  if (!C.getLangOpts().CPlusPlus || C.getLangOpts().ObjC)
     return llvm::createStringError(
         std::make_error_code(std::errc::invalid_argument),
         "Can only analyze C++");

clang/unittests/Analysis/FlowSensitive/DeterminismTest.cpp

@@ -30,7 +30,9 @@ namespace clang::dataflow {
 // flow-condition at function exit.
 std::string analyzeAndPrintExitCondition(llvm::StringRef Code) {
   DataflowAnalysisContext DACtx(std::make_unique<WatchedLiteralsSolver>());
-  clang::TestAST AST(Code);
+  TestInputs Inputs(Code);
+  Inputs.Language = TestLanguage::Lang_CXX17;
+  clang::TestAST AST(Inputs);
   const auto *Target =
       cast<FunctionDecl>(test::findValueDecl(AST.context(), "target"));
   Environment InitEnv(DACtx, *Target);

clang/unittests/Analysis/FlowSensitive/TransferTest.cpp

@@ -17,6 +17,7 @@
 #include "clang/Analysis/FlowSensitive/StorageLocation.h"
 #include "clang/Analysis/FlowSensitive/Value.h"
 #include "clang/Basic/LangStandard.h"
+#include "clang/Testing/TestAST.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Testing/Support/Error.h"
@@ -135,12 +136,32 @@ const Formula &getFormula(const ValueDecl &D, const Environment &Env) {
 }
 
 TEST(TransferTest, CNotSupported) {
-  std::string Code = R"(
-    void target() {}
-  )";
-  ASSERT_THAT_ERROR(checkDataflowWithNoopAnalysis(
-                        Code, [](const auto &, auto &) {}, {BuiltinOptions{}},
-                        LangStandard::lang_c89),
+  TestInputs Inputs("void target() {}");
+  Inputs.Language = TestLanguage::Lang_C89;
+  clang::TestAST AST(Inputs);
+  const auto *Target =
+      cast<FunctionDecl>(test::findValueDecl(AST.context(), "target"));
+  ASSERT_THAT_ERROR(AdornedCFG::build(*Target).takeError(),
+                    llvm::FailedWithMessage("Can only analyze C++"));
+}
+
+TEST(TransferTest, ObjectiveCNotSupported) {
+  TestInputs Inputs("void target() {}");
+  Inputs.Language = TestLanguage::Lang_OBJC;
+  clang::TestAST AST(Inputs);
+  const auto *Target =
+      cast<FunctionDecl>(test::findValueDecl(AST.context(), "target"));
+  ASSERT_THAT_ERROR(AdornedCFG::build(*Target).takeError(),
+                    llvm::FailedWithMessage("Can only analyze C++"));
+}
+
+TEST(TransferTest, ObjectiveCXXNotSupported) {
+  TestInputs Inputs("void target() {}");
+  Inputs.Language = TestLanguage::Lang_OBJCXX;
+  clang::TestAST AST(Inputs);
+  const auto *Target =
+      cast<FunctionDecl>(test::findValueDecl(AST.context(), "target"));
+  ASSERT_THAT_ERROR(AdornedCFG::build(*Target).takeError(),
                     llvm::FailedWithMessage("Can only analyze C++"));
 }