[Webkit-unassigned] [Bug 255512] New: Node CallStringConstructor should throw an exception when the parameter is a Symbol

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255512

            Bug ID: 255512
           Summary: Node CallStringConstructor should throw an exception
                    when the parameter is a Symbol
           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: entryhii at gmail.com

*********************
function f1(a2,a3) {
  const v5 = new String(a3);
  print(v5)
  return String;
}
const v8 = new Proxy(String, {"get": f1});

try {
  v8["split"](v8);
} catch (e12) {}

*********************

With the above script as input to JSC, run JSC with the following parameters:
./jsc test.js --useConcurrentJIT=0 --jitPolicyScale=0

In LLInt(executing the above script with --jitPolicyScale=1), JSC throws an exception (symbol cannot convert into string), but in JIT, JSC doesn't throw any exception.

The problem may be in Node CallStringConstructor. When the parameter is a Symbol, DFG invoke asSymbol(argument)->descriptiveString instead of throwing an exception.

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