Cleanup the AST code by removing unused parts and get rid of the...

src/ia32/full-codegen-ia32.cc

 // Copyright 2010 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 3007 matching lines @@
       Split(cc, if_true, if_false, NULL);
     }
   }
 
   // Convert the result of the comparison into one expected for this
   // expression's context.
   Apply(context_, if_true, if_false);
 }
 
 
+void FullCodeGenerator::VisitCompareToNull(CompareToNull* expr) {
+  Label materialize_true, materialize_false;
+  Label* if_true = NULL;
+  Label* if_false = NULL;
+  PrepareTest(&materialize_true, &materialize_false, &if_true, &if_false);
+
+  VisitForValue(expr->expression(), kAccumulator);
+  __ cmp(eax, Factory::null_value());
+  if (expr->is_strict()) {
+    Split(equal, if_true, if_false, NULL);
+  } else {
+    __ j(equal, if_true);
+    __ cmp(eax, Factory::undefined_value());
+    __ j(equal, if_true);
+    __ test(eax, Immediate(kSmiTagMask));
+    __ j(zero, if_false);
+    // It can be an undetectable object.
+    __ mov(edx, FieldOperand(eax, HeapObject::kMapOffset));
+    __ movzx_b(edx, FieldOperand(edx, Map::kBitFieldOffset));
+    __ test(edx, Immediate(1 << Map::kIsUndetectable));
+    Split(not_zero, if_true, if_false, NULL);
+  }
+  Apply(context_, if_true, if_false);
+}
+
+
 void FullCodeGenerator::VisitThisFunction(ThisFunction* expr) {
   __ mov(eax, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
   Apply(context_, eax);
 }
 
 
 Register FullCodeGenerator::result_register() { return eax; }
 
 
 Register FullCodeGenerator::context_register() { return esi; }
@@ skipping 39 matching lines @@
   // And return.
   __ ret(0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32