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

src/arm/full-codegen-arm.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 2988 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) {
+  Comment cmnt(masm_, "[ CompareToNull");
+  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);
+  __ LoadRoot(r1, Heap::kNullValueRootIndex);
+  __ cmp(r0, r1);
+  if (expr->is_strict()) {
+    Split(eq, if_true, if_false, NULL);
+  } else {
+    __ b(eq, if_true);
+    __ LoadRoot(r1, Heap::kUndefinedValueRootIndex);
+    __ cmp(r0, r1);
+    __ b(eq, if_true);
+    __ tst(r0, Operand(kSmiTagMask));
+    __ b(eq, if_false);
+    // It can be an undetectable object.
+    __ ldr(r1, FieldMemOperand(r0, HeapObject::kMapOffset));
+    __ ldrb(r1, FieldMemOperand(r1, Map::kBitFieldOffset));
+    __ and_(r1, r1, Operand(1 << Map::kIsUndetectable));
+    __ cmp(r1, Operand(1 << Map::kIsUndetectable));
+    Split(eq, if_true, if_false, NULL);
+  }
+  Apply(context_, if_true, if_false);
+}
+
+
 void FullCodeGenerator::VisitThisFunction(ThisFunction* expr) {
   __ ldr(r0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
   Apply(context_, r0);
 }
 
 
 Register FullCodeGenerator::result_register() { return r0; }
 
 
 Register FullCodeGenerator::context_register() { return cp; }
@@ skipping 36 matching lines @@
   __ mov(r1, Operand(r1, ASR, 1));  // Un-smi-tag value.
   __ add(pc, r1, Operand(masm_->CodeObject()));
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM