Bug 244191 – [DFG] Usekind of input is lifted before print function

• Status: NEW
• Component: JavaScriptCore

[Yue Sun]

path/to/jsc test.js --useConcurrentJIT=0 --forceWeakRandomSeed=1 --useFTLJIT=0 --jitPolicyScale=0
path/to/jsc test.js --useConcurrentJIT=0 --forceWeakRandomSeed=1 --jitPolicyScale=0.01

function bar(a, b) {
    try {
      return a;
    } finally {
      print(b)
      b--;
    }
  
    a /= b;
  }
  
  function test_context() {
    function foo(x) {
      return 42;
    }
  
    var s, t;
  
    for (var i = 0; i < 10; i++) {
      bar(t = foo(i) ? bar(42 + i - i) : bar(0), s = i + t);
    }
  
    return s;
  }
  
  test_context();

We ran the script with command line options above. In function bar(), variable b have a arithsub after print function. It would have problem if b is undefined, since Low Level Interpreter would first print "undefined" then sub 1 to get NaN, while DFG would transfer undefined to number and print "NaN".

[Radar WebKit Bug Importer]

<rdar://problem/99268944>