[modules] Introduce v8::Module to the API and return it from CompileModule

src/objects.h

 // Copyright 2015 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 #include <memory>
 
@@ skipping 7853 matching lines @@
 };
 
 // A Module object is a mapping from export names to cells
 // This is still very much in flux.
 class Module : public Struct {
  public:
   DECLARE_CAST(Module)
   DECLARE_VERIFIER(Module)
   DECLARE_PRINTER(Module)
 
+  // The code representing this Module, either a
+  // SharedFunctionInfo or a JSFunction depending
+  // on whether it's been instantiated.
+  DECL_ACCESSORS(code, Object)
+
   DECL_ACCESSORS(exports, ObjectHashTable)
 
   static void CreateExport(Handle<Module> module, Handle<String> name);
   static void StoreExport(Handle<Module> module, Handle<String> name,
                           Handle<Object> value);
   static Handle<Object> LoadExport(Handle<Module> module, Handle<String> name);
 
-  static const int kExportsOffset = HeapObject::kHeaderSize;
+  static const int kCodeOffset = HeapObject::kHeaderSize;
+  static const int kExportsOffset = kCodeOffset + kPointerSize;
   static const int kSize = kExportsOffset + kPointerSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Module);
 };
 
 // JSBoundFunction describes a bound function exotic object.
 class JSBoundFunction : public JSObject {
  public:
   // [bound_target_function]: The wrapped function object.
@@ skipping 3404 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_