Implement Harmony semantics for typeof null (behind a flag).

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 82733a7c1d35ea4d65646f3e33fc31fca3f5e3bb..4b53ada498f2d7dcc2af206ff10b1c67ad5dd704 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -4853,7 +4853,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_Typeof) {
         return isolate->heap()->boolean_symbol();
       }
       if (heap_obj->IsNull()) {
-        return isolate->heap()->object_symbol();
+        return FLAG_harmony_typeof ? isolate->heap()->null_symbol()
+                                   : isolate->heap()->object_symbol();

[Kevin Millikin (Chromium), 2011/08/10 09:52:21]

Normal V8 style seems to be to break like this:

return FLAG_harmony_typeof
    ? isolate->heap()->null_symbol()
    : isolate->heap()->object_symbol();

Avoids running away to the right at the cost of one more line.

[rossberg, 2011/08/10 12:01:35]

Done.

       }
       ASSERT(heap_obj->IsUndefined());
       return isolate->heap()->undefined_symbol();