v8/test/mjsunit/compiler/escape-analysis.js

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// Flags: --allow-natives-syntax --use-escape-analysis


// Test stores on a join path.
(function testJoin() {
  function constructor() {
    this.a = 0;
  }
  function join(mode, expected) {
    var object = new constructor();
    if (mode) {
      object.a = 1;
    } else {
      object.a = 2;
    }
    assertEquals(expected, object.a);
  }
  join(true, 1); join(true, 1);
  join(false, 2); join(false, 2);
  %OptimizeFunctionOnNextCall(join);
  join(true, 1); join(false, 2);
})();


// Test loads and stores inside a loop.
(function testLoop() {
  function constructor() {
    this.a = 0;
    this.b = 23;
  }
  function loop() {
    var object = new constructor();
    for (var i = 1; i < 10; i++) {
      object.a = object.a + i;
      assertEquals(i*(i+1)/2, object.a);
      assertEquals(23, object.b);
    }
    assertEquals(45, object.a);
    assertEquals(23, object.b);
  }
  loop(); loop();
  %OptimizeFunctionOnNextCall(loop);
  loop(); loop();
})();


// Test loads and stores inside nested loop.
(function testNested() {
  function constructor() {
    this.a = 0;
    this.b = 0;
    this.c = 23;
  }
  function nested() {
    var object = new constructor();
    for (var i = 1; i < 10; i++) {
      object.a = object.a + i;
      assertEquals(i*(i+1)/2, object.a);
      assertEquals((i-1)*6, object.b);
      assertEquals(23, object.c);
      for (var j = 1; j < 4; j++) {
        object.b = object.b + j;
        assertEquals(i*(i+1)/2, object.a);
        assertEquals((i-1)*6+j*(j+1)/2, object.b);
        assertEquals(23, object.c);
      }
      assertEquals(i*(i+1)/2, object.a);
      assertEquals(i*6, object.b);
      assertEquals(23, object.c);
    }
    assertEquals(45, object.a);
    assertEquals(54, object.b);
    assertEquals(23, object.c);
  }
  nested(); nested();
  %OptimizeFunctionOnNextCall(nested);
  nested(); nested();
})();


// Test deoptimization with captured objects in local variables.
(function testDeoptLocal() {
  var deopt = { deopt:false };
  function constructor1() {
    this.a = 1.0;
    this.b = 2.3;
    this.c = 3.0;
  }
  function constructor2(o) {
    this.d = o;
    this.e = 4.5;
  }
  function func() {
    var o1 = new constructor1();
    var o2 = new constructor2(o1);
    deopt.deopt;
    assertEquals(1.0, o1.a);
    assertEquals(2.3, o2.d.b);
    assertEquals(3.0, o2.d.c);
    assertEquals(4.5, o2.e);
  }
  func(); func();
  %OptimizeFunctionOnNextCall(func);
  func(); func();
  delete deopt.deopt;
  func(); func();
})();