v8/test/mjsunit/compiler/regress-closures-with-eval.js

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// Flags: --allow-natives-syntax

// Verifies that closures in presence of eval work fine.
function withEval(expr, filter) {
  %PrepareFunctionForOptimization(filter);
  function walk(v) {
    for (var i in v) {
      for (var i in v) {}
    }
    %OptimizeFunctionOnNextCall(filter);
    return filter(v);
  }

  var o = eval(expr);
  return walk(o);
}

function makeTagInfoJSON(n) {
  var a = new Array(n);
  for (var i = 0; i < n; i++) a.push('{}');
  return a;
}

var expr = '([' + makeTagInfoJSON(128).join(', ') + '])';

%PrepareFunctionForOptimization(withEval);
for (var n = 0; n < 5; n++) {
  withEval(expr, function(a) { return a; });
}
%OptimizeFunctionOnNextCall(withEval);
withEval(expr, function(a) { return a; });