Closed Bug 443599 Opened 16 years ago Closed 12 years ago

SM: Eliminate iterator object for non-escaping native enumerators

Categories

(Core :: JavaScript Engine, defect)

Product:
Core
Component:
JavaScript Engine
Type:
defect
Priority:
Not set
Severity:
normal

Tracking

()

Status:
RESOLVED WORKSFORME

People

(Reporter: igor, Assigned: igor)

Details

(Keywords: perf) 

+++ This bug was initially created as a clone of Bug #417131 +++

Currently to implement the for-in loop SM always creates an iterator object for native enumerators. It would be nice to optimize away such object as the script has no access to it and it serves purely as a storage for the enumerator state and extra flags. The idea is to use stack slots to store all the necessary information instead of creating such object, see bug 417131 comment 14 for a prototype of such implementation.
Status: NEW → RESOLVED
Closed: 12 years ago
Resolution: --- → WORKSFORME
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