[debugger] basic test infrastructure for new debugger test api.

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 28ebfc05b9839327fb596ac491514e1b341fe1a9..bce9103f6499fbbafb869c2085d5a40e69e523df 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -34,6 +34,10 @@
 #include "src/utils.h"
 #include "src/v8.h"
 
+#ifdef V8_INSPECTOR_ENABLED
+#include "include/v8-inspector.h"
+#endif  // V8_INSPECTOR_ENABLED
+
 #if !defined(_WIN32) && !defined(_WIN64)
 #include <unistd.h>  // NOLINT
 #else
@@ -596,7 +600,8 @@ class ModuleEmbedderData {
 enum {
   // The debugger reserves the first slot in the Context embedder data.
   kDebugIdIndex = Context::kDebugIdIndex,
-  kModuleEmbedderDataIndex
+  kModuleEmbedderDataIndex,
+  kInspectorClientIndex
 };
 
 void InitializeModuleEmbedderData(Local<Context> context) {
@@ -1759,6 +1764,130 @@ void Shell::RunShell(Isolate* isolate) {
   printf("\n");
 }
 
+#ifdef V8_INSPECTOR_ENABLED
+class InspectorFrontend final : public v8_inspector::V8Inspector::Channel {
+ public:
+  explicit InspectorFrontend(Local<Context> context) {
+    isolate_ = context->GetIsolate();
+    context_.Reset(isolate_, context);
+  }
+  virtual ~InspectorFrontend() = default;
+
+ private:
+  void sendProtocolResponse(int callId,
+                            const v8_inspector::StringView& message) override {
+    Send(message);
+  }
+  void sendProtocolNotification(
+      const v8_inspector::StringView& message) override {
+    Send(message);
+  }
+  void flushProtocolNotifications() override {}
+
+  void Send(const v8_inspector::StringView& string) {
+    int length = static_cast<int>(string.length());
+    DCHECK(length < v8::String::kMaxLength);
+    Local<String> message =
+        (string.is8Bit()
+             ? v8::String::NewFromOneByte(
+                   isolate_,
+                   reinterpret_cast<const uint8_t*>(string.characters8()),
+                   v8::NewStringType::kNormal, length)
+             : v8::String::NewFromTwoByte(
+                   isolate_,
+                   reinterpret_cast<const uint16_t*>(string.characters16()),
+                   v8::NewStringType::kNormal, length))
+            .ToLocalChecked();
+    Local<String> callback_name =
+        v8::String::NewFromUtf8(isolate_, "receive", v8::NewStringType::kNormal)
+            .ToLocalChecked();
+    Local<Context> context = context_.Get(isolate_);
+    Local<Value> callback =
+        context->Global()->Get(context, callback_name).ToLocalChecked();
+    if (callback->IsFunction()) {
+      v8::TryCatch try_catch(isolate_);
+      Local<Value> args[] = {message};
+      if (Local<Function>::Cast(callback)
+              ->Call(context, Undefined(isolate_), 1, args)
+              .IsEmpty()) {
+        try_catch.ReThrow();
+      }
+    }
+  }
+
+  Isolate* isolate_;
+  Global<Context> context_;
+};
+
+class InspectorClient : public v8_inspector::V8InspectorClient {
+ public:
+  InspectorClient(Local<Context> context, bool connect) {
+    if (!connect) return;
+    isolate_ = context->GetIsolate();
+    channel_.reset(new InspectorFrontend(context));
+    inspector_ = v8_inspector::V8Inspector::create(isolate_, this);
+    session_ =
+        inspector_->connect(1, channel_.get(), v8_inspector::StringView());
+    context->SetAlignedPointerInEmbedderData(kInspectorClientIndex, this);
+    inspector_->contextCreated(v8_inspector::V8ContextInfo(
+        context, kContextGroupId, v8_inspector::StringView()));
+
+    Local<Value> function =
+        FunctionTemplate::New(isolate_, SendInspectorMessage)
+            ->GetFunction(context)
+            .ToLocalChecked();
+    Local<String> function_name =
+        String::NewFromUtf8(isolate_, "send", NewStringType::kNormal)
+            .ToLocalChecked();
+    CHECK(context->Global()->Set(context, function_name, function).FromJust());
+
+    context_.Reset(isolate_, context);
+  }
+
+ private:
+  static v8_inspector::V8InspectorSession* GetSession(Local<Context> context) {
+    InspectorClient* inspector_client = static_cast<InspectorClient*>(
+        context->GetAlignedPointerFromEmbedderData(kInspectorClientIndex));
+    return inspector_client->session_.get();
+  }
+
+  Local<Context> ensureDefaultContextInGroup(int group_id) override {
+    DCHECK(isolate_);
+    DCHECK_EQ(kContextGroupId, group_id);
+    return context_.Get(isolate_);
+  }
+
+  static void SendInspectorMessage(
+      const v8::FunctionCallbackInfo<v8::Value>& args) {
+    Isolate* isolate = args.GetIsolate();
+    v8::HandleScope handle_scope(isolate);
+    Local<Context> context = isolate->GetCurrentContext();
+    args.GetReturnValue().Set(Undefined(isolate));
+    Local<String> message = args[0]->ToString(context).ToLocalChecked();
+    v8_inspector::V8InspectorSession* session =
+        InspectorClient::GetSession(context);
+    int length = message->Length();
+    std::unique_ptr<uint16_t> buffer(new uint16_t[length]);
+    message->Write(buffer.get(), 0, length);
+    v8_inspector::StringView message_view(buffer.get(), length);
+    session->dispatchProtocolMessage(message_view);
+    args.GetReturnValue().Set(True(isolate));
+  }
+
+  static const int kContextGroupId = 1;
+
+  std::unique_ptr<v8_inspector::V8Inspector> inspector_;
+  std::unique_ptr<v8_inspector::V8InspectorSession> session_;
+  std::unique_ptr<v8_inspector::V8Inspector::Channel> channel_;
+  Global<Context> context_;
+  Isolate* isolate_;
+};
+#else   // V8_INSPECTOR_ENABLED
+class InspectorClient {
+ public:
+  InspectorClient(Local<Context> context, bool connect) { CHECK(!connect); }
+};
+#endif  // V8_INSPECTOR_ENABLED
 
 SourceGroup::~SourceGroup() {
   delete thread_;
@@ -1842,7 +1971,6 @@ base::Thread::Options SourceGroup::GetThreadOptions() {
   return base::Thread::Options("IsolateThread", 2 * MB);
 }
 
-
 void SourceGroup::ExecuteInThread() {
   Isolate::CreateParams create_params;
   create_params.array_buffer_allocator = Shell::array_buffer_allocator;
@@ -1857,6 +1985,8 @@ void SourceGroup::ExecuteInThread() {
         Local<Context> context = Shell::CreateEvaluationContext(isolate);
         {
           Context::Scope cscope(context);
+          InspectorClient inspector_client(context,
+                                           Shell::options.enable_inspector);
           PerIsolateData::RealmScope realm_scope(PerIsolateData::Get(isolate));
           Execute(isolate);
         }
@@ -2252,6 +2382,9 @@ bool Shell::SetOptions(int argc, char* argv[]) {
     } else if (strncmp(argv[i], "--trace-config=", 15) == 0) {
       options.trace_config = argv[i] + 15;
       argv[i] = NULL;
+    } else if (strcmp(argv[i], "--enable-inspector") == 0) {
+      options.enable_inspector = true;
+      argv[i] = NULL;
     }
   }
 
@@ -2301,6 +2434,7 @@ int Shell::RunMain(Isolate* isolate, int argc, char* argv[], bool last_run) {
     }
     {
       Context::Scope cscope(context);
+      InspectorClient inspector_client(context, options.enable_inspector);
       PerIsolateData::RealmScope realm_scope(PerIsolateData::Get(isolate));
       options.isolate_sources[0].Execute(isolate);
     }