diff --git a/src/ast/variables.cc b/src/ast/variables.cc
new file mode 100644
index 0000000..8e00782
--- /dev/null
+++ b/src/ast/variables.cc
@@ -0,0 +1,82 @@
+// Copyright 2011 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/variables.h"
+
+#include "src/ast/ast.h"
+#include "src/ast/scopes.h"
+
+namespace v8 {
+namespace internal {
+
+// ----------------------------------------------------------------------------
+// Implementation Variable.
+
+const char* Variable::Mode2String(VariableMode mode) {
+  switch (mode) {
+    case VAR: return "VAR";
+    case CONST_LEGACY: return "CONST_LEGACY";
+    case LET: return "LET";
+    case CONST: return "CONST";
+    case IMPORT: return "IMPORT";
+    case DYNAMIC: return "DYNAMIC";
+    case DYNAMIC_GLOBAL: return "DYNAMIC_GLOBAL";
+    case DYNAMIC_LOCAL: return "DYNAMIC_LOCAL";
+    case TEMPORARY: return "TEMPORARY";
+  }
+  UNREACHABLE();
+  return NULL;
+}
+
+
+Variable::Variable(Scope* scope, const AstRawString* name, VariableMode mode,
+                   Kind kind, InitializationFlag initialization_flag,
+                   MaybeAssignedFlag maybe_assigned_flag)
+    : scope_(scope),
+      name_(name),
+      mode_(mode),
+      kind_(kind),
+      location_(VariableLocation::UNALLOCATED),
+      index_(-1),
+      initializer_position_(RelocInfo::kNoPosition),
+      has_strong_mode_reference_(false),
+      strong_mode_reference_start_position_(RelocInfo::kNoPosition),
+      strong_mode_reference_end_position_(RelocInfo::kNoPosition),
+      local_if_not_shadowed_(NULL),
+      is_from_eval_(false),
+      force_context_allocation_(false),
+      is_used_(false),
+      initialization_flag_(initialization_flag),
+      maybe_assigned_(maybe_assigned_flag) {
+  // Var declared variables never need initialization.
+  DCHECK(!(mode == VAR && initialization_flag == kNeedsInitialization));
+}
+
+
+bool Variable::IsGlobalObjectProperty() const {
+  // Temporaries are never global, they must always be allocated in the
+  // activation frame.
+  return (IsDynamicVariableMode(mode_) ||
+          (IsDeclaredVariableMode(mode_) && !IsLexicalVariableMode(mode_))) &&
+         scope_ != NULL && scope_->is_script_scope() && !is_this();
+}
+
+
+bool Variable::IsStaticGlobalObjectProperty() const {
+  // Temporaries are never global, they must always be allocated in the
+  // activation frame.
+  return (IsDeclaredVariableMode(mode_) && !IsLexicalVariableMode(mode_)) &&
+         scope_ != NULL && scope_->is_script_scope() && !is_this();
+}
+
+
+int Variable::CompareIndex(Variable* const* v, Variable* const* w) {
+  int x = (*v)->index();
+  int y = (*w)->index();
+  // Consider sorting them according to type as well?
+  return x - y;
+}
+
+}  // namespace internal
+}  // namespace v8