ARM side of load optimization in the presence of eval.

src/codegen-ia32.cc

 // Copyright 2006-2008 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 437 matching lines @@
       return Operand(eax);
   }
 }
 
 
 Operand CodeGenerator::ContextSlotOperandCheckExtensions(Slot* slot,
                                                          Register tmp,
                                                          Label* slow) {
   ASSERT(slot->type() == Slot::CONTEXT);
   int index = slot->index();
-  __ mov(tmp, Operand(esi));
+  Register context = esi;
   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.
-        __ cmp(ContextOperand(tmp, Context::EXTENSION_INDEX), Immediate(0));
+        __ cmp(ContextOperand(context, Context::EXTENSION_INDEX), Immediate(0));
         __ j(not_equal, slow, not_taken);
       }
-      __ mov(tmp, ContextOperand(tmp, Context::CLOSURE_INDEX));
+      __ mov(tmp, ContextOperand(context, Context::CLOSURE_INDEX));
       __ mov(tmp, FieldOperand(tmp, JSFunction::kContextOffset));
+      context = tmp;
     }
   }
   // Check that last extension is NULL.
   __ cmp(ContextOperand(tmp, Context::EXTENSION_INDEX), Immediate(0));
   __ j(not_equal, slow, not_taken);
   __ mov(tmp, ContextOperand(tmp, Context::FCONTEXT_INDEX));
   return ContextOperand(tmp, index);
 }
 
 
@@ skipping 1927 matching lines @@
   }
 }
 
 
 void CodeGenerator::LoadFromGlobalSlotCheckExtensions(Slot* slot,
                                                       TypeofState typeof_state,
                                                       Register tmp,
                                                       Label* slow) {
   // Check that no extension objects have been created by calls to
   // eval from the current scope to the global scope.
-  __ mov(tmp, Operand(esi));
+  Register context = esi;
   for (Scope* s = scope(); s != NULL; s = s->outer_scope()) {
     if (s->num_heap_slots() > 0) {
       if (s->calls_eval()) {
         // Check that extension is NULL.
-        __ cmp(ContextOperand(tmp, Context::EXTENSION_INDEX), Immediate(0));
+        __ cmp(ContextOperand(context, Context::EXTENSION_INDEX), Immediate(0));
         __ j(not_equal, slow, not_taken);
       }
       // Load next context in chain.
-      __ mov(tmp, ContextOperand(tmp, Context::CLOSURE_INDEX));
+      __ mov(tmp, ContextOperand(context, Context::CLOSURE_INDEX));
       __ mov(tmp, FieldOperand(tmp, JSFunction::kContextOffset));
+      context = tmp;
     }
     // If no outer scope calls eval, we do not need to check more
     // context extensions.
     if (!s->outer_scope_calls_eval()) break;
   }
 
   // All extension objects were empty and it is safe to use a global
   // load IC call.
   Handle<Code> ic(Builtins::builtin(Builtins::LoadIC_Initialize));
   // Load the global object.
@@ skipping 2984 matching lines @@
 
   // Slow-case: Go through the JavaScript implementation.
   __ bind(&slow);
   __ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal