[modules] Basic support of exports

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 47f6eade257bacce59778bd4efbbe2c191ba03cd..0f341219d35d1ed0116189684e781b8ec97841c0 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -70,6 +70,7 @@
 //         - JSValue
 //           - JSDate
 //         - JSMessageObject
+//         - JSModule
 //       - JSProxy
 //     - FixedArrayBase
 //       - ByteArray
@@ -94,6 +95,7 @@
 //         - TemplateList
 //         - TransitionArray
 //         - ScopeInfo
+//         - ModuleInfoEntry
 //         - ModuleInfo
 //         - ScriptContextTable
 //         - WeakFixedArray
@@ -879,6 +881,7 @@ class LiteralsArray;
 class LookupIterator;
 class FieldType;
 class ModuleDescriptor;
+class ModuleInfoEntry;
 class ModuleInfo;
 class ObjectHashTable;
 class ObjectVisitor;
@@ -961,6 +964,7 @@ template <class C> inline bool Is(Object* obj);
   V(JSObject)                    \
   V(JSContextExtensionObject)    \
   V(JSGeneratorObject)           \
+  V(JSModule)                    \
   V(Map)                         \
   V(DescriptorArray)             \
   V(FrameArray)                  \
@@ -980,6 +984,7 @@ template <class C> inline bool Is(Object* obj);
   V(ScriptContextTable)          \
   V(NativeContext)               \
   V(ScopeInfo)                   \
+  V(ModuleInfoEntry)             \
   V(ModuleInfo)                  \
   V(JSBoundFunction)             \
   V(JSFunction)                  \
@@ -4412,7 +4417,7 @@ class ScopeInfo : public FixedArray {
 
   // The layout of the static part of a ScopeInfo is as follows. Each entry is
   // numeric and occupies one array slot.
-  // 1. A set of properties of the scope
+// 1. A set of properties of the scope.
 // 2. The number of parameters. For non-function scopes this is 0.
 // 3. The number of non-parameter variables allocated on the stack.
 // 4. The number of non-parameter and parameter variables allocated in the
@@ -4530,6 +4535,30 @@ class ScopeInfo : public FixedArray {
   friend class ScopeIterator;
 };
 
+class ModuleInfoEntry : public FixedArray {
+ public:
+  DECLARE_CAST(ModuleInfoEntry)
+  static Handle<ModuleInfoEntry> New(Isolate* isolate,
+                                     Handle<Object> export_name,
+                                     Handle<Object> local_name,
+                                     Handle<Object> import_name,
+                                     Handle<Object> module_request);
+  inline Object* export_name() const;
+  inline Object* local_name() const;
+  inline Object* import_name() const;
+  inline Object* module_request() const;
+
+ private:
+  friend class Factory;
+  enum {
+    kExportNameIndex,
+    kLocalNameIndex,
+    kImportNameIndex,
+    kModuleRequestIndex,
+    kLength
+  };
+};
+
 // ModuleInfo is to ModuleDescriptor what ScopeInfo is to Scope.
 class ModuleInfo : public FixedArray {
  public:
@@ -6337,6 +6366,7 @@ class Map: public HeapObject {
   inline bool IsJSFunctionMap();
   inline bool IsStringMap();
   inline bool IsJSProxyMap();
+  inline bool IsJSModuleMap();
   inline bool IsJSGlobalProxyMap();
   inline bool IsJSGlobalObjectMap();
   inline bool IsJSTypedArrayMap();
@@ -7814,6 +7844,21 @@ class JSGeneratorObject: public JSObject {
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSGeneratorObject);
 };
 
+// A JSModule object is a mapping from export names to cells
+// This is still very much in flux.
+class JSModule : public JSObject {
+ public:
+  DECLARE_CAST(JSModule)
+  DECLARE_VERIFIER(JSModule)
+
+  static const int kSize = JSObject::kHeaderSize;
+
+  static void CreateExport(Handle<JSModule> module, Handle<String> name);
+  static void StoreExport(Handle<JSModule> module, Handle<String> name,
+                          Handle<Object> value);
+  static Handle<Object> LoadExport(Handle<JSModule> module,
+                                   Handle<String> name);
+};
 
 // JSBoundFunction describes a bound function exotic object.
 class JSBoundFunction : public JSObject {