v8/test/mjsunit/compiler/inline-function-apply.js

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// Flags: --allow-natives-syntax

// Test inlining and deoptimization of function.apply(this, arguments)
// calls for which the exact number of arguments is known.
(function () {
  "use strict";
  function test(argumentsCount) {
    var dispatcher = {};
    var deoptimize = { deopt:false };
    dispatcher["const" + argumentsCount] = 0;
    dispatcher.func = C;

    function A(x,y) {
      var r = "A";
      if (argumentsCount == 1) r += B(10);
      if (argumentsCount == 2) r += B(10, 11);
      if (argumentsCount == 3) r += B(10, 11, 12);
      assertSame(1, x);
      assertSame(2, y);
      return r;
    }

    function B(x,y) {
      x = 0; y = 0;
      var r = "B" + dispatcher.func.apply(this, arguments);
      assertSame(argumentsCount, arguments.length);
      for (var i = 0; i < arguments.length; i++) {
        assertSame(10 + i, arguments[i]);
      }
      return r;
    }

    function C(x,y) {
      x = 0; y = 0;
      var r = "C"
      deoptimize.deopt;
      assertSame(argumentsCount, arguments.length);
      for (var i = 0; i < arguments.length; i++) {
        assertSame(10 + i, arguments[i]);
      }
      return r;
    }

    %PrepareFunctionForOptimization(A);
    assertEquals("ABC", A(1,2));
    assertEquals("ABC", A(1,2));
    %OptimizeFunctionOnNextCall(A);
    assertEquals("ABC", A(1,2));
    delete deoptimize.deopt;
    assertEquals("ABC", A(1,2));

    %DeoptimizeFunction(A);
    %ClearFunctionFeedback(A);
    %DeoptimizeFunction(B);
    %ClearFunctionFeedback(B);
    %DeoptimizeFunction(C);
    %ClearFunctionFeedback(C);
  }

  for (var a = 1; a <= 3; a++) {
    test(a);
  }
})();