Merge pull request swiftlang#10303 from augusto2112/6.1-fix-interop-checking-mod

[cherry-pick][lldb] Check if C++ interop and embedded Swift are enabled on CU instead of whole module

Author: adrian-prantl

lldb/source/Plugins/Language/Swift/SwiftLanguage.cpp

@@ -1165,9 +1165,6 @@ SwiftLanguage::GetHardcodedSynthetics() {
 
       Log *log(GetLog(LLDBLog::DataFormatters));
 
-      if (!valobj.GetTargetSP()->IsSwiftCxxInteropEnabled())
-        return nullptr;
-
       CompilerType type(valobj.GetCompilerType());
       auto swift_type_system =
           type.GetTypeSystem().dyn_cast_or_null<TypeSystemSwift>();
@@ -1197,6 +1194,29 @@ SwiftLanguage::GetHardcodedSynthetics() {
         return nullptr;
       }
 
+      // Find the compile unit and module using the frame, because the value
+      // object may not have a module in the case of an expression that
+      // evaluates to a type.
+      if (!valobj.GetFrameSP())
+        return nullptr;
+
+      auto sc = valobj.GetFrameSP()->GetSymbolContext(
+          lldb::SymbolContextItem::eSymbolContextCompUnit |
+          lldb::SymbolContextItem::eSymbolContextModule);
+
+      // If there is a compile unit, use that to check if C++ interop should be
+      // enabled. If there is no compiler unit, use the module. If neither
+      // exist, assume that C++ interop is disabled.
+      if (auto *cu = sc.comp_unit) {
+        if (!SwiftASTContext::ShouldEnableCXXInterop(cu))
+          return nullptr;
+      } else if (sc.module_sp) {
+        if (!sc.module_sp->IsSwiftCxxInteropEnabled())
+          return nullptr;
+      } else {
+        return nullptr;
+      }
+
       casted->SetName(ConstString("Clang_Type"));
 
       SyntheticChildrenSP synth_sp =

lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.cpp

@@ -2625,8 +2625,7 @@ SwiftASTContext::CreateInstance(lldb::LanguageType language, Module &module,
   return swift_ast_sp;
 }
 
-/// Determine whether this CU was compiled with C++ interop enabled.
-static bool ShouldEnableCXXInterop(CompileUnit *cu) {
+bool SwiftASTContext::CheckFlagInCU(CompileUnit *cu, const char *flag) {
   AutoBool interop_enabled =
     ModuleList::GetGlobalModuleListProperties().GetSwiftEnableCxxInterop();
   switch (interop_enabled) {
@@ -2640,8 +2639,6 @@ static bool ShouldEnableCXXInterop(CompileUnit *cu) {
     lldb::ModuleSP module = cu->CalculateSymbolContextModule();
     if (!module)
       return false;
-    // Look for the "-enable-experimental-cxx-interop" compile flag in the
-    // args of the compile units this module is composed of.
     auto *sym_file = module->GetSymbolFile();
     if (!sym_file)
       return false;
@@ -2650,7 +2647,7 @@ static bool ShouldEnableCXXInterop(CompileUnit *cu) {
       if (unit.get() == cu) {
         if (cu->GetLanguage() == eLanguageTypeSwift)
           for (const char *arg : args.GetArgumentArrayRef())
-            if (strcmp(arg, "-enable-experimental-cxx-interop") == 0)
+            if (strcmp(arg, flag) == 0)
               return true;
         return false;
       }
@@ -2660,6 +2657,15 @@ static bool ShouldEnableCXXInterop(CompileUnit *cu) {
   return false;
 }
 
+/// Determine whether this CU was compiled with C++ interop enabled.
+bool SwiftASTContext::ShouldEnableCXXInterop(CompileUnit *cu) {
+  return CheckFlagInCU(cu, "-enable-experimental-cxx-interop");
+}
+
+bool SwiftASTContext::ShouldEnableEmbeddedSwift(CompileUnit *cu) {
+  return CheckFlagInCU(cu, "-enable-embedded-swift");
+}
+
 static bool IsUnitTestExecutable(lldb_private::Module &module) {
   static ConstString s_xctest("xctest");
   static ConstString s_XCTRunner("XCTRunner");
@@ -2773,7 +2779,7 @@ SwiftASTContext::CreateInstance(const SymbolContext &sc,
     swift_ast_sp->m_is_scratch_context = true;
     auto &lang_opts = swift_ast_sp->GetLanguageOptions();
     lang_opts.EnableCXXInterop = ShouldEnableCXXInterop(cu);
-    if (target_sp->IsEmbeddedSwift())
+    if (ShouldEnableEmbeddedSwift(cu))
       lang_opts.enableFeature(swift::Feature::Embedded);
   } else {
     // Typesystem fallback context.
@@ -2789,8 +2795,8 @@ SwiftASTContext::CreateInstance(const SymbolContext &sc,
     swift_ast_sp->m_module = module_sp.get();
     auto &lang_opts = swift_ast_sp->GetLanguageOptions();
     lang_opts.EnableAccessControl = false;
-    lang_opts.EnableCXXInterop = module_sp->IsSwiftCxxInteropEnabled();
-    if (module_sp->IsEmbeddedSwift())
+    lang_opts.EnableCXXInterop = ShouldEnableCXXInterop(cu);
+    if (ShouldEnableEmbeddedSwift(cu))
       lang_opts.enableFeature(swift::Feature::Embedded);
   }
   auto defer_log = llvm::make_scope_exit(

lldb/source/Plugins/TypeSystem/Swift/SwiftASTContext.h

@@ -209,6 +209,13 @@ class SwiftASTContext : public TypeSystemSwift {
                  TypeSystemSwiftTypeRef &typeref_typesystem,
                  const char *extra_options = nullptr);
 
+  /// Returns true if the given flag is present in the given compile unit.
+  static bool CheckFlagInCU(CompileUnit *cu, const char *flag);
+
+  static bool ShouldEnableCXXInterop(CompileUnit *cu);
+
+  static bool ShouldEnableEmbeddedSwift(CompileUnit *cu);
+
   static void EnumerateSupportedLanguages(
       std::set<lldb::LanguageType> &languages_for_types,
       std::set<lldb::LanguageType> &languages_for_expressions);