src/third_party/v8/test/mjsunit/compiler/escape-analysis-representation.js

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// Flags: --allow-natives-syntax

// This tests that captured objects materialized through the deoptimizer
// have field descriptors with a representation matching the values that
// have actually been stored in the object.

var values = [ function() { return {}; },
               function() { return 23; },
               function() { return 4.2; } ];

function constructor(value_track) {
  this.x = value_track();
}

function access(value_track, value_break, deopt) {
  var o = new constructor(value_track);
  o.x = value_break;
  deopt.deopt
  assertEquals(value_break, o.x);
}

function test(value_track, value_break) {
  var deopt = { deopt:false };

  // Warm-up field tracking to a certain representation.
  %PrepareFunctionForOptimization(access);
  access(value_track, value_track(), deopt);
  access(value_track, value_track(), deopt);
  %OptimizeFunctionOnNextCall(access);
  access(value_track, value_track(), deopt);

  // Deoptimize on a run with a different representation.
  delete deopt.deopt;
  access(value_track, value_break(), deopt);

  // Clear type feedback of the access function for next run.
  %ClearFunctionFeedback(access);

  // Also make sure the initial map of the constructor is reset.
  constructor.prototype = {};
}

for (var i = 0; i < values.length; i++) {
  for (var j = 0; j < values.length; j++) {
    test(values[i], values[j])
  }
}