Remove legacy Hermes C++ code and HERMES_V1_ENABLED compile definition

Legacy Hermes support is no longer needed since 0.86 branch has been cut.
This removes all dead code behind `!defined(HERMES_V1_ENABLED)` guards
and the CMake infrastructure that set the HERMES_V1_ENABLED compile
definition.

Author: cipolleschi

packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt

@@ -22,8 +22,6 @@ file(TO_CMAKE_PATH "${REACT_ANDROID_DIR}" REACT_ANDROID_DIR)
 file(TO_CMAKE_PATH "${REACT_BUILD_DIR}" REACT_BUILD_DIR)
 file(TO_CMAKE_PATH "${REACT_COMMON_DIR}" REACT_COMMON_DIR)
 
-set(HERMES_V1_ENABLED OFF CACHE BOOL "Build with support for Hermes v1")
-
 # If you have ccache installed, we're going to honor it.
 find_program(CCACHE_FOUND ccache)
 if(CCACHE_FOUND)

packages/react-native/ReactCommon/cmake-utils/react-native-flags.cmake

@@ -32,7 +32,4 @@ function(target_compile_reactnative_options target_name scope)
   if(ANDROID)
     target_compile_definitions(${target_name} ${scope} RN_SERIALIZABLE_STATE)
   endif()
-  if(HERMES_V1_ENABLED)
-    target_compile_definitions(${target_name} ${scope} HERMES_V1_ENABLED=1)
-  endif()
 endfunction()

packages/react-native/ReactCommon/hermes/executor/HermesExecutorFactory.cpp

@@ -17,55 +17,13 @@
 
 #include <hermes/inspector-modern/chrome/HermesRuntimeTargetDelegate.h>
 
-#if defined(HERMES_ENABLE_DEBUGGER) && !defined(HERMES_V1_ENABLED)
-#include <hermes/inspector-modern/chrome/Registration.h>
-#include <hermes/inspector/RuntimeAdapter.h>
-#endif
-
 using namespace facebook::hermes;
 using namespace facebook::jsi;
 
 namespace facebook::react {
 
 namespace {
 
-#if defined(HERMES_ENABLE_DEBUGGER) && !defined(HERMES_V1_ENABLED)
-
-class HermesExecutorRuntimeAdapter
-    : public facebook::hermes::inspector_modern::RuntimeAdapter {
- public:
-  HermesExecutorRuntimeAdapter(
-      std::shared_ptr<HermesRuntime> runtime,
-      std::shared_ptr<MessageQueueThread> thread)
-      : runtime_(runtime), thread_(std::move(thread)) {}
-
-  virtual ~HermesExecutorRuntimeAdapter() = default;
-
-  HermesRuntime& getRuntime() override {
-    return *runtime_;
-  }
-
-  void tickleJs() override {
-    thread_->runOnQueue(
-        [weakRuntime = std::weak_ptr<HermesRuntime>(runtime_)]() {
-          auto runtime = weakRuntime.lock();
-          if (!runtime) {
-            return;
-          }
-          jsi::Function func =
-              runtime->global().getPropertyAsFunction(*runtime, "__tickleJs");
-          func.call(*runtime);
-        });
-  }
-
- private:
-  std::shared_ptr<HermesRuntime> runtime_;
-
-  std::shared_ptr<MessageQueueThread> thread_;
-};
-
-#endif // defined(HERMES_ENABLE_DEBUGGER) && !defined(HERMES_V1_ENABLED)
-
 struct ReentrancyCheck {
 // This is effectively a very subtle and complex assert, so only
 // include it in builds which would include asserts.
@@ -149,26 +107,13 @@ class DecoratedRuntime : public jsi::WithRuntimeDecorator<ReentrancyCheck> {
       const std::string& debuggerName)
       : jsi::WithRuntimeDecorator<ReentrancyCheck>(*runtime, reentrancyCheck_),
         runtime_(std::move(runtime)) {
-#if defined(HERMES_ENABLE_DEBUGGER) && !defined(HERMES_V1_ENABLED)
-    enableDebugger_ = enableDebugger;
-    if (enableDebugger_) {
-      std::shared_ptr<HermesRuntime> rt(runtime_, &hermesRuntime);
-      auto adapter =
-          std::make_unique<HermesExecutorRuntimeAdapter>(rt, jsQueue);
-      debugToken_ = facebook::hermes::inspector_modern::chrome::enableDebugging(
-          std::move(adapter), debuggerName);
-    }
-#else
+    (void)hermesRuntime;
     (void)jsQueue;
-#endif // HERMES_ENABLE_DEBUGGER
+    (void)enableDebugger;
+    (void)debuggerName;
   }
 
   ~DecoratedRuntime() {
-#if defined(HERMES_ENABLE_DEBUGGER) && !defined(HERMES_V1_ENABLED)
-    if (enableDebugger_) {
-      facebook::hermes::inspector_modern::chrome::disableDebugging(debugToken_);
-    }
-#endif // HERMES_ENABLE_DEBUGGER
   }
 
  private:
@@ -181,10 +126,6 @@ class DecoratedRuntime : public jsi::WithRuntimeDecorator<ReentrancyCheck> {
 
   std::shared_ptr<Runtime> runtime_;
   ReentrancyCheck reentrancyCheck_;
-#if defined(HERMES_ENABLE_DEBUGGER) && !defined(HERMES_V1_ENABLED)
-  bool enableDebugger_;
-  facebook::hermes::inspector_modern::chrome::DebugSessionToken debugToken_;
-#endif // HERMES_ENABLE_DEBUGGER
 };
 
 } // namespace