Collect list of requested modules in ModuleDescriptor while parsing

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 {
 namespace internal {
 
 
 class AstRawString;
 
 
 class ModuleDescriptor : public ZoneObject {
  public:
   // ---------------------------------------------------------------------------
   // Factory methods.
 
   static ModuleDescriptor* New(Zone* zone) {
-    return new (zone) ModuleDescriptor();
+    return new (zone) ModuleDescriptor(zone);
   }
 
   // ---------------------------------------------------------------------------
   // Mutators.
 
   // Add a name to the list of exports. If it already exists, or this descriptor
   // is frozen, that's an error.
   void AddLocalExport(const AstRawString* export_name,
                       const AstRawString* local_name, Zone* zone, bool* ok);
 
+  // Add module_specifier to the list of requested modules,
+  // if not already present.
+  void AddModuleRequest(const AstRawString* module_specifier, Zone* zone);
+
   // 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 10 matching lines @@
 
   // The context slot in the hosting script context pointing to this module.
   int Index() {
     DCHECK(IsFrozen());
     return index_;
   }
 
   const AstRawString* LookupLocalExport(const AstRawString* export_name,
                                         Zone* zone);
 
+  const ZoneList<const AstRawString*>& requested_modules() const {
+    return requested_modules_;
+  }
+
   // ---------------------------------------------------------------------------
   // Iterators.
 
   // Use like:
   //   for (auto it = descriptor->iterator(); !it.done(); it.Advance()) {
   //     ... it.name() ...
   //   }
   class Iterator {
    public:
     bool done() const { return entry_ == NULL; }
@@ skipping 14 matching lines @@
 
     const ZoneHashMap* exports_;
     ZoneHashMap::Entry* entry_;
   };
 
   Iterator iterator() const { return Iterator(this->exports_); }
 
   // ---------------------------------------------------------------------------
   // Implementation.
  private:
+  explicit ModuleDescriptor(Zone* zone)
+      : frozen_(false),
+        exports_(NULL),
+        requested_modules_(1, zone),
+        index_(-1) {}
+
   bool frozen_;
   ZoneHashMap* exports_;   // Module exports and their types (allocated lazily)
+  ZoneList<const AstRawString*> requested_modules_;
   int index_;
-
-  ModuleDescriptor() : frozen_(false), exports_(NULL), index_(-1) {}
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_MODULES_H_