Implement rudimentary module linking.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 41 matching lines @@
 //     - Smi          (immediate small integer)
 //     - HeapObject   (superclass for everything allocated in the heap)
 //       - JSReceiver  (suitable for property access)
 //         - JSObject
 //           - JSArray
 //           - JSSet
 //           - JSMap
 //           - JSWeakMap
 //           - JSRegExp
 //           - JSFunction
+//           - JSModule
 //           - GlobalObject
 //             - JSGlobalObject
 //             - JSBuiltinsObject
 //           - JSGlobalProxy
 //           - JSValue
 //             - JSDate
 //           - JSMessageObject
 //         - JSProxy
 //           - JSFunctionProxy
 //       - FixedArrayBase
@@ skipping 227 matching lines @@
   V(FIXED_ARRAY_TYPE)                                                          \
   V(FIXED_DOUBLE_ARRAY_TYPE)                                                   \
   V(SHARED_FUNCTION_INFO_TYPE)                                                 \
                                                                                \
   V(JS_MESSAGE_OBJECT_TYPE)                                                    \
                                                                                \
   V(JS_VALUE_TYPE)                                                             \
   V(JS_DATE_TYPE)                                                              \
   V(JS_OBJECT_TYPE)                                                            \
   V(JS_CONTEXT_EXTENSION_OBJECT_TYPE)                                          \
+  V(JS_MODULE_TYPE)                                                            \
   V(JS_GLOBAL_OBJECT_TYPE)                                                     \
   V(JS_BUILTINS_OBJECT_TYPE)                                                   \
   V(JS_GLOBAL_PROXY_TYPE)                                                      \
   V(JS_ARRAY_TYPE)                                                             \
   V(JS_PROXY_TYPE)                                                             \
   V(JS_WEAK_MAP_TYPE)                                                          \
   V(JS_REGEXP_TYPE)                                                            \
                                                                                \
   V(JS_FUNCTION_TYPE)                                                          \
   V(JS_FUNCTION_PROXY_TYPE)                                                    \
@@ skipping 300 matching lines @@
   // the two forms of function. This organization enables using the same
   // compares for checking the JS_RECEIVER/SPEC_OBJECT range and the
   // NONCALLABLE_JS_OBJECT range.
   JS_FUNCTION_PROXY_TYPE,  // FIRST_JS_RECEIVER_TYPE, FIRST_JS_PROXY_TYPE
   JS_PROXY_TYPE,  // LAST_JS_PROXY_TYPE
 
   JS_VALUE_TYPE,  // FIRST_JS_OBJECT_TYPE
   JS_DATE_TYPE,
   JS_OBJECT_TYPE,
   JS_CONTEXT_EXTENSION_OBJECT_TYPE,
+  JS_MODULE_TYPE,
   JS_GLOBAL_OBJECT_TYPE,
   JS_BUILTINS_OBJECT_TYPE,
   JS_GLOBAL_PROXY_TYPE,
   JS_ARRAY_TYPE,
   JS_SET_TYPE,
   JS_MAP_TYPE,
   JS_WEAK_MAP_TYPE,
 
   JS_REGEXP_TYPE,
 
@@ skipping 157 matching lines @@
   V(ExternalIntArray)                          \
   V(ExternalUnsignedIntArray)                  \
   V(ExternalFloatArray)                        \
   V(ExternalDoubleArray)                       \
   V(ExternalPixelArray)                        \
   V(ByteArray)                                 \
   V(FreeSpace)                                 \
   V(JSReceiver)                                \
   V(JSObject)                                  \
   V(JSContextExtensionObject)                  \
+  V(JSModule)                                  \
   V(Map)                                       \
   V(DescriptorArray)                           \
   V(DeoptimizationInputData)                   \
   V(DeoptimizationOutputData)                  \
   V(TypeFeedbackCells)                         \
   V(FixedArray)                                \
   V(FixedDoubleArray)                          \
   V(Context)                                   \
   V(GlobalContext)                             \
+  V(ModuleContext)                             \
   V(ScopeInfo)                                 \
   V(JSFunction)                                \
   V(Code)                                      \
   V(Oddball)                                   \
   V(SharedFunctionInfo)                        \
   V(JSValue)                                   \
   V(JSDate)                                    \
   V(JSMessageObject)                           \
   V(StringWrapper)                             \
   V(Foreign)                                   \
@@ skipping 4859 matching lines @@
       ((kNative + kCompilerHintsSmiTagSize) / kBitsPerByte);
 #else
 #error Unknown byte ordering
 #endif
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(SharedFunctionInfo);
 };
 
 
+// Representation for module instance objects.
+class JSModule: public JSObject {
+ public:
+  // [context]: the context holding the module's locals, or undefined if none.
+  DECL_ACCESSORS(context, Object)
+
+  // Casting.
+  static inline JSModule* cast(Object* obj);
+
+  // Dispatched behavior.
+#ifdef OBJECT_PRINT
+  inline void JSModulePrint() {
+    JSModulePrint(stdout);
+  }
+  void JSModulePrint(FILE* out);
+#endif
+#ifdef DEBUG
+  void JSModuleVerify();
+#endif
+
+  // Layout description.
+  static const int kContextOffset = JSObject::kHeaderSize;
+  static const int kSize = kContextOffset + kPointerSize;
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(JSModule);
+};
+
+
 // JSFunction describes JavaScript functions.
 class JSFunction: public JSObject {
  public:
   // [prototype_or_initial_map]:
   DECL_ACCESSORS(prototype_or_initial_map, Object)
 
   // [shared]: The information about the function that
   // can be shared by instances.
   DECL_ACCESSORS(shared, SharedFunctionInfo)
 
@@ skipping 2891 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_