[Webkit-unassigned] [Bug 19400] New: subscript operator does not protect base when necessary

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=19400

           Summary: subscript operator does not protect base when necessary
           Product: WebKit
           Version: 526+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.5
            Status: NEW
          Keywords: HasReduction, Regression
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: oliver at apple.com
                CC: mjs at apple.com, ggaren at apple.com, cwzwarich at uwaterloo.ca


in the expression
var  a = [-1];
print(a[++a])

the result should be '0', but instead is 'undefined', as the code emitted does
pre_inc a
get_by_val result, a, a
...

but should actually do
mov temp, a
pre_inc a
get_by_val result, temp, a

The issue is that we don't guard the base against potential modification by the
subscript expression


-- 
Configure bugmail: http://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.