[modules] Introduce new VariableLocation for module imports/exports.

src/ast/scopes.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_AST_SCOPES_H_
 #define V8_AST_SCOPES_H_
 
 #include "src/ast/ast.h"
 #include "src/base/hashmap.h"
 #include "src/globals.h"
@@ skipping 675 matching lines @@
   bool NeedsHomeObject() const {
     return scope_uses_super_property_ ||
            ((scope_calls_eval_ || inner_scope_calls_eval_) &&
             (IsConciseMethod(function_kind()) ||
              IsAccessorFunction(function_kind()) ||
              IsClassConstructor(function_kind())));
   }
 
   // The ModuleDescriptor for this scope; only for module scopes.
   // TODO(verwaest): Move to ModuleScope?
-  ModuleDescriptor* module() const { return module_descriptor_; }
+  ModuleDescriptor* module() const {
+    DCHECK(is_module_scope());
+    DCHECK_NOT_NULL(module_descriptor_);
+    return module_descriptor_;
+  }
 
   void DeclareThis(AstValueFactory* ast_value_factory);
   void DeclareDefaultFunctionVariables(AstValueFactory* ast_value_factory);
 
   // This lookup corresponds to a lookup in the "intermediate" scope sitting
   // between this scope and the outer scope. (ECMA-262, 3rd., requires that
   // the name of named function literal is kept in an intermediate scope
   // in between this scope and the next outer scope.)
   Variable* LookupFunctionVar(const AstRawString* name,
                               AstNodeFactory* factory);
@@ skipping 150 matching lines @@
   void AnalyzePartially(DeclarationScope* migrate_to,
                         AstNodeFactory* ast_node_factory);
 
 #ifdef DEBUG
   void PrintParameters();
 #endif
 
   void AllocateLocals(AstValueFactory* ast_value_factory);
   void AllocateParameterLocals();
   void AllocateReceiver();
+  // Set MODULE as VariableLocation for all variables that will live in some
+  // module's export table.
+  void AllocateModuleVariables();
 
  private:
   void AllocateParameter(Variable* var, int index);
 
   void SetDefaults();
 
   // If the scope is a function scope, this is the function kind.
   const FunctionKind function_kind_;
 
   bool has_simple_parameters_ : 1;
@@ skipping 21 matching lines @@
   // Convenience variable; Subclass constructor only
   Variable* this_function_;
   // Module descriptor; module scopes only.
   ModuleDescriptor* module_descriptor_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_SCOPES_H_