[modules] Basic support of 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 357 matching lines @@
   // function, or eval scope. Same as DeclarationScope(), but skips declaration
   // "block" scopes. Used for differentiating associated function objects (i.e.,
   // the scope for which a function prologue allocates a context) or declaring
   // temporaries.
   DeclarationScope* GetClosureScope();
 
   // Find the first (non-arrow) function or script scope.  This is where
   // 'this' is bound, and what determines the function kind.
   DeclarationScope* GetReceiverScope();
 
+  // Find the module scope, assuming there is one.
+  ModuleScope* GetModuleScope();
+
   // Analyze() must have been called once to create the ScopeInfo.
   Handle<ScopeInfo> scope_info() {
     DCHECK(!scope_info_.is_null());
     return scope_info_;
   }
 
   // ---------------------------------------------------------------------------
   // Strict mode support.
   bool IsDeclared(const AstRawString* name) {
     // During formal parameter list parsing the scope only contains
@@ skipping 283 matching lines @@
   Variable* new_target_var() { return new_target_; }
 
   // The variable holding the function literal for named function
   // literals, or NULL.  Only valid for function scopes.
   Variable* function_var() const {
     DCHECK(is_function_scope());
     return function_;
   }
 
   // Parameters. The left-most parameter has index 0.
-  // Only valid for function scopes.
+  // Only valid for function and module scopes.
   Variable* parameter(int index) const {
-    DCHECK(is_function_scope());
+    DCHECK(is_function_scope() || is_module_scope());
     return params_[index];
   }
 
   // Returns the default function arity excluding default or rest parameters.
   int default_function_length() const { return arity_; }
 
   // Returns the number of formal parameters, excluding a possible rest
   // parameter.  Examples:
   //   function foo(a, b) {}         ==> 2
   //   function foo(a, b, ...c) {}   ==> 2
@@ skipping 158 matching lines @@
   void AllocateModuleVariables();
 
  private:
   ModuleDescriptor* module_descriptor_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_SCOPES_H_