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

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 8894 matching lines @@
 }
 
 
 // --- D e b u g   S u p p o r t ---
 
 bool Debug::SetDebugEventListener(Isolate* isolate, EventCallback that,
                                   Local<Value> data) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   ENTER_V8(i_isolate);
   i::HandleScope scope(i_isolate);
-  i::Handle<i::Object> foreign = i_isolate->factory()->undefined_value();
-  if (that != NULL) {
-    foreign = i_isolate->factory()->NewForeign(FUNCTION_ADDR(that));
+  if (that == nullptr) {
+    i_isolate->debug()->SetDebugDelegate(nullptr, false);
+  } else {
+    i::Handle<i::Object> i_data = i_isolate->factory()->undefined_value();
+    if (!data.IsEmpty()) i_data = Utils::OpenHandle(*data);
+    i::NativeDebugDelegate* delegate =
+        new i::NativeDebugDelegate(i_isolate, that, i_data);
+    i_isolate->debug()->SetDebugDelegate(delegate, true);
   }
-  i_isolate->debug()->SetEventListener(foreign, Utils::OpenHandle(*data, true));
   return true;
 }
 
 void Debug::DebugBreak(Isolate* isolate) {
   reinterpret_cast<i::Isolate*>(isolate)->stack_guard()->RequestDebugBreak();
 }
 
 
 void Debug::CancelDebugBreak(Isolate* isolate) {
   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
@@ skipping 432 matching lines @@
     has_pending_exception = result.is_null();
     RETURN_ON_FAILED_EXECUTION(UnboundScript);
   }
   RETURN_ESCAPED(ToApiHandle<UnboundScript>(result));
 }
 
 void debug::SetDebugDelegate(Isolate* v8_isolate,
                              debug::DebugDelegate* delegate) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
   ENTER_V8(isolate);
-  isolate->debug()->SetDebugDelegate(delegate);
+  isolate->debug()->SetDebugDelegate(delegate, false);
 }
 
 void debug::ResetBlackboxedStateCache(Isolate* v8_isolate,
                                       v8::Local<debug::Script> script) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
   ENTER_V8(isolate);
   i::DisallowHeapAllocation no_gc;
   i::SharedFunctionInfo::ScriptIterator iter(Utils::OpenHandle(*script));
   while (i::SharedFunctionInfo* info = iter.Next()) {
     info->set_computed_debug_is_blackboxed(false);
@@ skipping 769 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