[modules] Expand API to allow linking and use it in d8

src/d8.h

 // 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.
 
 #ifndef V8_D8_H_
 #define V8_D8_H_
 
+#include <map>
+#include <string>
+
 #include "src/allocation.h"
 #include "src/base/hashmap.h"
 #include "src/base/platform/time.h"
 #include "src/list.h"
 
 #include "src/base/once.h"
 
 
 namespace v8 {
 
@@ skipping 288 matching lines @@
   SourceGroup* isolate_sources;
   const char* icu_data_file;
   const char* natives_blob;
   const char* snapshot_blob;
   bool trace_enabled;
   const char* trace_config;
 };
 
 class Shell : public i::AllStatic {
  public:
-  enum SourceType { SCRIPT, MODULE };
-
   static MaybeLocal<Script> CompileString(
       Isolate* isolate, Local<String> source, Local<Value> name,
       v8::ScriptCompiler::CompileOptions compile_options);
   static bool ExecuteString(Isolate* isolate, Local<String> source,
                             Local<Value> name, bool print_result,
-                            bool report_exceptions,
-                            SourceType source_type = SCRIPT);
+                            bool report_exceptions);
+  static bool ExecuteModule(Isolate* isolate, const char* file_name);
   static const char* ToCString(const v8::String::Utf8Value& value);
   static void ReportException(Isolate* isolate, TryCatch* try_catch);
   static Local<String> ReadFile(Isolate* isolate, const char* name);
   static Local<Context> CreateEvaluationContext(Isolate* isolate);
   static int RunMain(Isolate* isolate, int argc, char* argv[], bool last_run);
   static int Main(int argc, char* argv[]);
   static void Exit(int exit_code);
   static void OnExit(Isolate* isolate);
   static void CollectGarbage(Isolate* isolate);
   static void EmptyMessageQueues(Isolate* isolate);
@@ skipping 112 matching lines @@
 
   static void WriteIgnitionDispatchCountersFile(v8::Isolate* isolate);
   static Counter* GetCounter(const char* name, bool is_histogram);
   static Local<String> Stringify(Isolate* isolate, Local<Value> value);
   static void Initialize(Isolate* isolate);
   static void RunShell(Isolate* isolate);
   static bool SetOptions(int argc, char* argv[]);
   static Local<ObjectTemplate> CreateGlobalTemplate(Isolate* isolate);
   static MaybeLocal<Context> CreateRealm(
       const v8::FunctionCallbackInfo<v8::Value>& args);
+  static MaybeLocal<Module> FetchModuleTree(
+      Isolate* isolate, const std::string& file_name,
+      std::map<std::string, Global<Module>>* module_map);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_