[Webkit-unassigned] [Bug 239757] New: Wrong JIT compilation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239757

            Bug ID: 239757
           Summary: Wrong JIT compilation
           Product: WebKit
           Version: WebKit Local Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zhunkibatu at gmail.com

Created attachment 458332

  --> https://bugs.webkit.org/attachment.cgi?id=458332&action=review

the minimal poc

The following PoC outputs differently before/after JIT compilation.

function opt() {
        const a = [12345678901];
        const b = a[12345];
        const c = () => {
                try {
                        throw "";
                } catch(e) {
                        ({});
                }
        };
        const d = c();
        return b;
}

print(opt());//undefined
for(var i=0;i<10000;i++){
        opt();
}
print(opt());//NaN

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