[debug] Revert debug API removal

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 8716 matching lines @@
 
 
 bool Debug::CheckDebugBreak(Isolate* isolate) {
   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
   return internal_isolate->stack_guard()->CheckDebugBreak();
 }
 
 
 void Debug::SetMessageHandler(Isolate* isolate,
                               v8::Debug::MessageHandler handler) {
-  UNIMPLEMENTED();
+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  ENTER_V8(i_isolate);
+  i_isolate->debug()->SetMessageHandler(handler);
 }
 
 
 void Debug::SendCommand(Isolate* isolate,
                         const uint16_t* command,
                         int length,
                         ClientData* client_data) {
-  UNIMPLEMENTED();
+  i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  internal_isolate->debug()->EnqueueCommandMessage(
+      i::Vector<const uint16_t>(command, length), client_data);
 }
 
 
 MaybeLocal<Value> Debug::Call(Local<Context> context,
                               v8::Local<v8::Function> fun,
                               v8::Local<v8::Value> data) {
   PREPARE_FOR_EXECUTION(context, Debug, Call, Value);
   i::Handle<i::Object> data_obj;
   if (data.IsEmpty()) {
     data_obj = isolate->factory()->undefined_value();
   } else {
     data_obj = Utils::OpenHandle(*data);
   }
   Local<Value> result;
   has_pending_exception =
       !ToLocal<Value>(isolate->debug()->Call(Utils::OpenHandle(*fun), data_obj),
                       &result);
   RETURN_ON_FAILED_EXECUTION(Value);
   RETURN_ESCAPED(result);
 }
 
 
 MaybeLocal<Value> Debug::GetMirror(Local<Context> context,
                                    v8::Local<v8::Value> obj) {
-  UNIMPLEMENTED();
-  return MaybeLocal<Value>();
+  PREPARE_FOR_EXECUTION(context, Debug, GetMirror, Value);
+  i::Debug* isolate_debug = isolate->debug();
+  has_pending_exception = !isolate_debug->Load();
+  RETURN_ON_FAILED_EXECUTION(Value);
+  i::Handle<i::JSObject> debug(isolate_debug->debug_context()->global_object());
+  auto name = isolate->factory()->NewStringFromStaticChars("MakeMirror");
+  auto fun_obj = i::JSReceiver::GetProperty(debug, name).ToHandleChecked();
+  auto v8_fun = Utils::CallableToLocal(i::Handle<i::JSFunction>::cast(fun_obj));
+  const int kArgc = 1;
+  v8::Local<v8::Value> argv[kArgc] = {obj};
+  Local<Value> result;
+  has_pending_exception =
+      !v8_fun->Call(context, Utils::ToLocal(debug), kArgc, argv)
+           .ToLocal(&result);
+  RETURN_ON_FAILED_EXECUTION(Value);
+  RETURN_ESCAPED(result);
 }
 
-void Debug::ProcessDebugMessages(Isolate* isolate) { UNIMPLEMENTED(); }
+void Debug::ProcessDebugMessages(Isolate* isolate) {
+  reinterpret_cast<i::Isolate*>(isolate)->debug()->ProcessDebugMessages(true);
+}
+
 
 Local<Context> Debug::GetDebugContext(Isolate* isolate) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   ENTER_V8(i_isolate);
   return Utils::ToLocal(i_isolate->debug()->GetDebugContext());
 }
 
 
 MaybeLocal<Context> Debug::GetDebuggedContext(Isolate* isolate) {
-  UNIMPLEMENTED();
-  return MaybeLocal<Context>();
+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  ENTER_V8(i_isolate);
+  if (!i_isolate->debug()->in_debug_scope()) return MaybeLocal<Context>();
+  i::Handle<i::Object> calling = i_isolate->GetCallingNativeContext();
+  if (calling.is_null()) return MaybeLocal<Context>();
+  return Utils::ToLocal(i::Handle<i::Context>::cast(calling));
 }
 
 void Debug::SetLiveEditEnabled(Isolate* isolate, bool enable) {
   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
   internal_isolate->debug()->set_live_edit_enabled(enable);
 }
 
 bool Debug::IsTailCallEliminationEnabled(Isolate* isolate) {
   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
   return internal_isolate->is_tail_call_elimination_enabled();
@@ skipping 1043 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8