v8/test/mjsunit/compiler/property-static.js

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// Flags: --allow-natives-syntax

// Test usage of static type information for loads that would otherwise
// turn into polymorphic or generic loads.

// Prepare a highly polymorphic load to be used by all tests.
Object.prototype.load = function() { return this.property; };
Object.prototype.load.call({ A:0, property:10 });
Object.prototype.load.call({ A:0, B:0, property:11 });
Object.prototype.load.call({ A:0, B:0, C:0, property:12 });
Object.prototype.load.call({ A:0, B:0, C:0, D:0, property:13 });
Object.prototype.load.call({ A:0, B:0, C:0, D:0, E:0, property:14 });
Object.prototype.load.call({ A:0, B:0, C:0, D:0, E:0, F:0, property:15 });

// Test for object literals.
(function() {
  function f(x) {
    var object = { property:x };
    return object.load();
  }

  %PrepareFunctionForOptimization(f);
  assertSame(1, f(1));
  assertSame(2, f(2));
  %OptimizeFunctionOnNextCall(f);
  assertSame(3, f(3));
})();

// Test for inlined constructors.
(function() {
  function c(x) {
    this.property = x;
  }
  function f(x) {
    var object = new c(x);
    return object.load();
  }

  %PrepareFunctionForOptimization(f);
  assertSame(1, f(1));
  assertSame(2, f(2));
  %OptimizeFunctionOnNextCall(f);
  assertSame(3, f(3));
})();