src/v8/test/mjsunit/regress/regress-2261.js

// Copyright 2012 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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// Flags: --allow-natives-syntax

// Test materialization of the arguments object when deoptimizing a
// strict mode closure after modifying an argument.

(function () {
  var forceDeopt = 0;
  function inner(x) {
    "use strict";
    x = 2;
    // Do not remove this %DebugPrint as it makes sure the deopt happens
    // after the assignment and is not hoisted above the assignment.
    %DebugPrint(arguments[0]);
    forceDeopt + 1;
    return arguments[0];
  };
  %PrepareFunctionForOptimization(inner);
  assertEquals(1, inner(1));
  assertEquals(1, inner(1));
  %OptimizeFunctionOnNextCall(inner);
  assertEquals(1, inner(1));
  forceDeopt = "not a number";
  assertEquals(1, inner(1));
})();


// Test materialization of the arguments object when deoptimizing an
// inlined strict mode closure after modifying an argument.

(function () {
  var forceDeopt = 0;
  function inner(x) {
    "use strict";
    x = 2;
    // Do not remove this %DebugPrint as it makes sure the deopt happens
    // after the assignment and is not hoisted above the assignment.
    %DebugPrint(arguments[0]);
    forceDeopt + 1;
    return arguments[0];
  }

  function outer(x) {
    return inner(x);
  };
  %PrepareFunctionForOptimization(outer);
  assertEquals(1, outer(1));
  assertEquals(1, outer(1));
  %OptimizeFunctionOnNextCall(outer);
  assertEquals(1, outer(1));
  forceDeopt = "not a number";
  assertEquals(1, outer(1));
})();


// Test materialization of the multiple arguments objects when
// deoptimizing several inlined closure after modifying an argument.

(function () {
  var forceDeopt = 0;
  function inner(x, y, z) {
    "use strict";
    x = 3;
    // Do not remove this %DebugPrint as it makes sure the deopt happens
    // after the assignment and is not hoisted above the assignment.
    %DebugPrint(arguments[0]);
    forceDeopt + 1;
    return arguments[0];
  }

  function middle(x) {
    "use strict";
    x = 2;
    return inner(10 * x, 20 * x, 30 * x) + arguments[0];
  }

  function outer(x) {
    return middle(x);
  };
  %PrepareFunctionForOptimization(outer);
  assertEquals(21, outer(1));
  assertEquals(21, outer(1));
  %OptimizeFunctionOnNextCall(outer);
  assertEquals(21, outer(1));
  forceDeopt = "not a number";
  assertEquals(21, outer(1));
})();