[Webkit-unassigned] [Bug 119504] New: DFG optimizes out strict mode arguments tear off
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon Aug 5 18:01:12 PDT 2013
https://bugs.webkit.org/show_bug.cgi?id=119504
Summary: DFG optimizes out strict mode arguments tear off
Product: WebKit
Version: 528+ (Nightly build)
Platform: Unspecified
OS/Version: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
AssignedTo: webkit-unassigned at lists.webkit.org
ReportedBy: oliver at apple.com
CC: fpizlo at apple.com
If i have a strict mode function:
function f(a) {
"use strict";
a = 5;
return arguments[0];
}
var x = 0;
for (var i = 0; i < N; i++)
x = x + f(1);
The result should be N, but the DFG optimizes out the eager tear off of the Arguments object, leading to arguments[0] eventually being optimized to return 5, which is incorrect.
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