[modules] Support exporting a local variable under multiple export names.

src/ast/scopes.cc

 // 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.
 
 #include "src/ast/scopes.h"
 
 #include <set>
 
 #include "src/accessors.h"
 #include "src/ast/ast.h"
@@ skipping 149 matching lines @@
 ModuleScope::ModuleScope(Isolate* isolate, Handle<ScopeInfo> scope_info,
                          AstValueFactory* avfactory)
     : DeclarationScope(avfactory->zone(), MODULE_SCOPE, scope_info) {
   Zone* zone = avfactory->zone();
   ModuleInfo* module_info = scope_info->ModuleDescriptorInfo();
 
   set_language_mode(STRICT);
   module_descriptor_ = new (zone) ModuleDescriptor(zone);
 
   // Deserialize special exports.
-  Handle<FixedArray> special_exports = handle(module_info->special_exports());
+  Handle<FixedArray> special_exports(module_info->special_exports(), isolate);
   for (int i = 0, n = special_exports->length(); i < n; ++i) {
     Handle<ModuleInfoEntry> serialized_entry(
         ModuleInfoEntry::cast(special_exports->get(i)), isolate);
     module_descriptor_->AddSpecialExport(
         ModuleDescriptor::Entry::Deserialize(isolate, avfactory,
                                              serialized_entry),
         avfactory->zone());
   }
 
   // Deserialize regular exports.
-  Handle<FixedArray> regular_exports = handle(module_info->regular_exports());
-  for (int i = 0, n = regular_exports->length(); i < n; ++i) {
-    Handle<ModuleInfoEntry> serialized_entry(
-        ModuleInfoEntry::cast(regular_exports->get(i)), isolate);
-    module_descriptor_->AddRegularExport(ModuleDescriptor::Entry::Deserialize(
-        isolate, avfactory, serialized_entry));
-  }
+  Handle<FixedArray> regular_exports(module_info->regular_exports(), isolate);
+  module_descriptor_->DeserializeRegularExports(isolate, avfactory,
+                                                regular_exports);
 
   // Deserialize special imports.
-  Handle<FixedArray> special_imports = handle(module_info->special_imports());
+  Handle<FixedArray> special_imports(module_info->special_imports(), isolate);
   for (int i = 0, n = special_imports->length(); i < n; ++i) {
     Handle<ModuleInfoEntry> serialized_entry(
         ModuleInfoEntry::cast(special_imports->get(i)), isolate);
     module_descriptor_->AddSpecialImport(
         ModuleDescriptor::Entry::Deserialize(isolate, avfactory,
                                              serialized_entry),
         avfactory->zone());
   }
 
   // Deserialize regular imports.
-  Handle<FixedArray> regular_imports = handle(module_info->regular_imports());
+  Handle<FixedArray> regular_imports(module_info->regular_imports(), isolate);
   for (int i = 0, n = regular_imports->length(); i < n; ++i) {
     Handle<ModuleInfoEntry> serialized_entry(
         ModuleInfoEntry::cast(regular_imports->get(i)), isolate);
     module_descriptor_->AddRegularImport(ModuleDescriptor::Entry::Deserialize(
         isolate, avfactory, serialized_entry));
   }
 }
 
 Scope::Scope(Zone* zone, ScopeType scope_type, Handle<ScopeInfo> scope_info)
     : zone_(zone),
@@ skipping 1633 matching lines @@
   Variable* function =
       is_function_scope() ? AsDeclarationScope()->function_var() : nullptr;
   bool is_function_var_in_context =
       function != nullptr && function->IsContextSlot();
   return num_heap_slots() - Context::MIN_CONTEXT_SLOTS -
          (is_function_var_in_context ? 1 : 0);
 }
 
 }  // namespace internal
 }  // namespace v8