[debugger] implement legacy debug event listeners via debug delegate.

src/runtime/runtime-debug.cc

 // Copyright 2014 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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/debug/debug-evaluate.h"
 #include "src/debug/debug-frames.h"
@@ skipping 61 matching lines @@
 // Adds a JavaScript function as a debug event listener.
 // args[0]: debug event listener function to set or null or undefined for
 //          clearing the event listener function
 // args[1]: object supplied during callback
 RUNTIME_FUNCTION(Runtime_SetDebugEventListener) {
   SealHandleScope shs(isolate);
   DCHECK_EQ(2, args.length());
   CHECK(args[0]->IsJSFunction() || args[0]->IsNullOrUndefined(isolate));
   CONVERT_ARG_HANDLE_CHECKED(Object, callback, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, data, 1);
-  isolate->debug()->SetEventListener(callback, data);
-
+  if (callback->IsJSFunction()) {
+    JavaScriptDebugDelegate* delegate = new JavaScriptDebugDelegate(
+        isolate, Handle<JSFunction>::cast(callback), data);
+    isolate->debug()->SetDebugDelegate(delegate, true);
+  } else {
+    isolate->debug()->SetDebugDelegate(nullptr, false);
+  }
   return isolate->heap()->undefined_value();
 }
 
 
 RUNTIME_FUNCTION(Runtime_ScheduleBreak) {
   SealHandleScope shs(isolate);
   DCHECK_EQ(0, args.length());
   isolate->stack_guard()->RequestDebugBreak();
   return isolate->heap()->undefined_value();
 }
@@ skipping 1751 matching lines @@
   DCHECK_EQ(1, args.length());
   HandleScope scope(isolate);
   CONVERT_ARG_HANDLE_CHECKED(JSObject, promise, 0);
   isolate->PushPromise(promise);
   int id = isolate->debug()->NextAsyncTaskId(promise);
   Handle<Symbol> async_stack_id_symbol =
       isolate->factory()->promise_async_stack_id_symbol();
   JSObject::SetProperty(promise, async_stack_id_symbol,
                         handle(Smi::FromInt(id), isolate), STRICT)
       .Assert();
-  isolate->debug()->OnAsyncTaskEvent(debug::kDebugEnqueueAsyncFunction, id);
+  isolate->debug()->OnAsyncTaskEvent(debug::kDebugEnqueueAsyncFunction, id, 0);
   return isolate->heap()->undefined_value();
 }
 
 RUNTIME_FUNCTION(Runtime_DebugPromiseReject) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSPromise, rejected_promise, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
 
   isolate->debug()->OnPromiseReject(rejected_promise, value);
   return isolate->heap()->undefined_value();
 }
 
 RUNTIME_FUNCTION(Runtime_DebugAsyncEventEnqueueRecurring) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   CONVERT_ARG_HANDLE_CHECKED(JSPromise, promise, 0);
   CONVERT_SMI_ARG_CHECKED(status, 1);
   if (isolate->debug()->is_active()) {
     isolate->debug()->OnAsyncTaskEvent(
         status == v8::Promise::kFulfilled ? debug::kDebugEnqueuePromiseResolve
                                           : debug::kDebugEnqueuePromiseReject,
-        isolate->debug()->NextAsyncTaskId(promise));
+        isolate->debug()->NextAsyncTaskId(promise), 0);
   }
   return isolate->heap()->undefined_value();
 }
 
 RUNTIME_FUNCTION(Runtime_DebugIsActive) {
   SealHandleScope shs(isolate);
   return Smi::FromInt(isolate->debug()->is_active());
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 
 }  // namespace internal
 }  // namespace v8