Speed up the LookupIterator

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index d63f56550ab7700a766bac3d5ad1507d407b9bf7..d7f4cc39f71ffbbc52bdc61be2de09937440e37d 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -419,6 +419,7 @@ const int kStubMinorKeyBits = kSmiValueSize - kStubMajorKeyBits - 1;
   V(JS_MODULE_TYPE)                                             \
   V(JS_GLOBAL_OBJECT_TYPE)                                      \
   V(JS_GLOBAL_PROXY_TYPE)                                       \
+  V(JS_SPECIAL_API_OBJECT_TYPE)                                 \
   V(JS_ARRAY_TYPE)                                              \
   V(JS_ARRAY_BUFFER_TYPE)                                       \
   V(JS_TYPED_ARRAY_TYPE)                                        \
@@ -438,7 +439,6 @@ const int kStubMinorKeyBits = kSmiValueSize - kStubMajorKeyBits - 1;
   V(DEBUG_INFO_TYPE)                                            \
   V(BREAK_POINT_INFO_TYPE)
 
-
 // Since string types are not consecutive, this macro is used to
 // iterate over them.
 #define STRING_TYPE_LIST(V)                                                   \
@@ -591,7 +591,6 @@ static inline bool IsShortcutCandidate(int type) {
   return ((type & kShortcutTypeMask) == kShortcutTypeTag);
 }
 
-
 enum InstanceType {
   // String types.
   INTERNALIZED_STRING_TYPE = kTwoByteStringTag | kSeqStringTag |
@@ -703,16 +702,17 @@ enum InstanceType {
   // objects in the JS sense. The first and the last type in this range are
   // the two forms of function. This organization enables using the same
   // compares for checking the JS_RECEIVER and the NONCALLABLE_JS_OBJECT range.
-  JS_PROXY_TYPE,  // FIRST_JS_RECEIVER_TYPE
-  JS_VALUE_TYPE,  // FIRST_JS_OBJECT_TYPE
+  JS_PROXY_TYPE,          // FIRST_JS_RECEIVER_TYPE
+  JS_GLOBAL_OBJECT_TYPE,  // FIRST_JS_OBJECT_TYPE
+  JS_GLOBAL_PROXY_TYPE,
+  JS_SPECIAL_API_OBJECT_TYPE,  // LAST_SPECIAL_RECEIVER_TYPE

[Jakob Kummerow, 2016/03/02 12:48:36]

Maybe include a comment right here? Roughly: "Like JS_OBJECT_TYPE, but requires
access checks and/or has interceptors."

[Toon Verwaest, 2016/03/02 12:52:26]

Done.

+  JS_VALUE_TYPE,
   JS_MESSAGE_OBJECT_TYPE,
   JS_DATE_TYPE,
   JS_OBJECT_TYPE,
   JS_CONTEXT_EXTENSION_OBJECT_TYPE,
   JS_GENERATOR_OBJECT_TYPE,
   JS_MODULE_TYPE,
-  JS_GLOBAL_OBJECT_TYPE,
-  JS_GLOBAL_PROXY_TYPE,
   JS_ARRAY_TYPE,
   JS_ARRAY_BUFFER_TYPE,
   JS_TYPED_ARRAY_TYPE,
@@ -753,8 +753,10 @@ enum InstanceType {
   FIRST_JS_RECEIVER_TYPE = JS_PROXY_TYPE,
   LAST_JS_RECEIVER_TYPE = LAST_TYPE,
   // Boundaries for testing the types represented as JSObject
-  FIRST_JS_OBJECT_TYPE = JS_VALUE_TYPE,
+  FIRST_JS_OBJECT_TYPE = JS_GLOBAL_OBJECT_TYPE,
   LAST_JS_OBJECT_TYPE = LAST_TYPE,
+  // Boundary for testing JSReceivers that need special property lookup handling
+  LAST_SPECIAL_RECEIVER_TYPE = JS_SPECIAL_API_OBJECT_TYPE,
 };
 
 STATIC_ASSERT(JS_OBJECT_TYPE == Internals::kJSObjectType);