Teach ModuleDescriptor about basic local exports

src/modules.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_MODULES_H_
 #define V8_MODULES_H_
 
 #include "src/zone.h"
 
 namespace v8 {
@@ skipping 10 matching lines @@
 
   static ModuleDescriptor* New(Zone* zone) {
     return new (zone) ModuleDescriptor();
   }
 
   // ---------------------------------------------------------------------------
   // Mutators.
 
   // Add a name to the list of exports. If it already exists, or this descriptor
   // is frozen, that's an error.
-  void Add(const AstRawString* name, Zone* zone, bool* ok);
+  void AddLocalExport(const AstRawString* export_name,
+                      const AstRawString* local_name, Zone* zone, bool* ok);
 
   // Do not allow any further refinements, directly or through unification.
   void Freeze() { frozen_ = true; }
 
   // Assign an index.
   void Allocate(int index) {
     DCHECK(IsFrozen() && index_ == -1);
     index_ = index;
   }
 
@@ skipping 18 matching lines @@
   // ---------------------------------------------------------------------------
   // Iterators.
 
   // Use like:
   //   for (auto it = descriptor->iterator(); !it.done(); it.Advance()) {
   //     ... it.name() ...
   //   }
   class Iterator {
    public:
     bool done() const { return entry_ == NULL; }
-    const AstRawString* name() const {
+    const AstRawString* export_name() const {
       DCHECK(!done());
       return static_cast<const AstRawString*>(entry_->key);
     }
+    const AstRawString* local_name() const {
+      DCHECK(!done());
+      return static_cast<const AstRawString*>(entry_->value);
+    }
     void Advance() { entry_ = exports_->Next(entry_); }
 
    private:
     friend class ModuleDescriptor;
     explicit Iterator(const ZoneHashMap* exports)
         : exports_(exports), entry_(exports ? exports->Start() : NULL) {}
 
     const ZoneHashMap* exports_;
     ZoneHashMap::Entry* entry_;
   };
 
   Iterator iterator() const { return Iterator(this->exports_); }
 
   // ---------------------------------------------------------------------------
   // Implementation.
  private:
   bool frozen_;
   ZoneHashMap* exports_;   // Module exports and their types (allocated lazily)
   int index_;
 
   ModuleDescriptor() : frozen_(false), exports_(NULL), index_(-1) {}
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_MODULES_H_