[Webkit-unassigned] [Bug 276163] New: valueOf is not executed for Atomics.isLockFree in JIT compiler

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Jul 2 20:20:58 PDT 2024


https://bugs.webkit.org/show_bug.cgi?id=276163

            Bug ID: 276163
           Summary: valueOf is not executed for Atomics.isLockFree in JIT
                    compiler
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: q602706150 at gmail.com

the test case
```
let count = 0
function opt() {
    Atomics.isLockFree({
        valueOf: function () {
            count++
        }
    });
}
for (let i = 0; i < 140; i++) {
    opt();
}
print(count)
```

run args:
cmake-build-debug/bin/jsc --useConcurrentJIT=0 ./test.js

expected output:
140

actual output:
99

tested in webkit commit id:
31e77e6ca86aa67419cbcf393a5bedcc925d8cf5

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