X64: Added unimplemented method in codegen-x64.cc.

src/x64/codegen-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3798 matching lines @@
     default:
       UNREACHABLE();
       return Operand(rsp, 0);
   }
 }
 
 
 Operand CodeGenerator::ContextSlotOperandCheckExtensions(Slot* slot,
                                                          Result tmp,
                                                          JumpTarget* slow) {
-  UNIMPLEMENTED();
-  return Operand(rsp, 0);
+  ASSERT(slot->type() == Slot::CONTEXT);
+  ASSERT(tmp.is_register());
+  Register context = rsi;
+
+  for (Scope* s = scope(); s != slot->var()->scope(); s = s->outer_scope()) {
+    if (s->num_heap_slots() > 0) {
+      if (s->calls_eval()) {
+        // Check that extension is NULL.
+        __ cmpq(ContextOperand(context, Context::EXTENSION_INDEX),
+                Immediate(0));
+        slow->Branch(not_equal, not_taken);
+      }
+      __ movq(tmp.reg(), ContextOperand(context, Context::CLOSURE_INDEX));
+      __ movq(tmp.reg(), FieldOperand(tmp.reg(), JSFunction::kContextOffset));
+      context = tmp.reg();
+    }
+  }
+  // Check that last extension is NULL.
+  __ cmpq(ContextOperand(context, Context::EXTENSION_INDEX), Immediate(0));
+  slow->Branch(not_equal, not_taken);
+  __ movq(tmp.reg(), ContextOperand(context, Context::FCONTEXT_INDEX));
+  return ContextOperand(tmp.reg(), slot->index());
 }
 
 
 void CodeGenerator::LoadFromSlot(Slot* slot, TypeofState typeof_state) {
   if (slot->type() == Slot::LOOKUP) {
     ASSERT(slot->var()->is_dynamic());
 
     JumpTarget slow;
     JumpTarget done;
     Result value;
@@ skipping 3116 matching lines @@
 int CompareStub::MinorKey() {
   // Encode the two parameters in a unique 16 bit value.
   ASSERT(static_cast<unsigned>(cc_) < (1 << 15));
   return (static_cast<unsigned>(cc_) << 1) | (strict_ ? 1 : 0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal