v8/test/mjsunit/compiler/optimized-for-in.js

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// Flags: --optimize-for-in --allow-natives-syntax

// Test for-in support in Crankshaft.  For simplicity this tests assumes certain
// fixed iteration order for properties and will have to be adjusted if V8
// stops following insertion order.


function a(t) {
  var result = [];
  for (var i in t) {
    result.push(i + t[i]);
  }
  return result.join('');
}

// Check that we correctly deoptimize on map check.
function b(t) {
  var result = [];
  for (var i in t) {
    result.push(i + t[i]);
    delete t[i];
  }
  return result.join('');
}

// Check that we correctly deoptimize during preparation step.
function c(t) {
  var result = [];
  for (var i in t) {
    result.push(i + t[i]);
  }
  return result.join('');
}

// Check that we deoptimize to the place after side effect in the right state.
function d(t) {
  var result = [];
  var o;
  for (var i in (o = t())) {
    result.push(i + o[i]);
  }
  return result.join('');
}

// Check that we correctly deoptimize on map check inserted for fused load.
function e(t) {
  var result = [];
  for (var i in t) {
    delete t[i];
    t[i] = i;
    result.push(i + t[i]);
  }
  return result.join('');
}

// Nested for-in loops.
function f(t) {
  var result = [];
  for (var i in t) {
    for (var j in t) {
      result.push(i + j + t[i] + t[j]);
    }
  }
  return result.join('');
}

// Deoptimization from the inner for-in loop.
function g(t) {
  var result = [];
  for (var i in t) {
    for (var j in t) {
      result.push(i + j + t[i] + t[j]);
      var v = t[i];
      delete t[i];
      t[i] = v;
    }
  }
  return result.join('');
}


// Break from the inner for-in loop.
function h(t, deopt) {
  var result = [];
  for (var i in t) {
    for (var j in t) {
      result.push(i + j + t[i] + t[j]);
      break;
    }
  }
  deopt.deopt;
  return result.join('');
}

// Continue in the inner loop.
function j(t, deopt) {
  var result = [];
  for (var i in t) {
    for (var j in t) {
      result.push(i + j + t[i] + t[j]);
      continue;
    }
  }
  deopt.deopt;
  return result.join('');
}

// Continue of the outer loop.
function k(t, deopt) {
  var result = [];
  outer: for (var i in t) {
    for (var j in t) {
      result.push(i + j + t[i] + t[j]);
      continue outer;
    }
  }
  deopt.deopt;
  return result.join('');
}

// Break of the outer loop.
function l(t, deopt) {
  var result = [];
  outer: for (var i in t) {
    for (var j in t) {
      result.push(i + j + t[i] + t[j]);
      break outer;
    }
  }
  deopt.deopt;
  return result.join('');
}

// Test deoptimization from inlined frame (currently it is not inlined).
function m0(t, deopt) {
  for (var i in t) {
    for (var j in t) {
      deopt.deopt;
      return i + j + t[i] + t[j];
    }
  }
}

function m(t, deopt) {
  return m0(t, deopt);
}


function tryFunction(s, mkT, f) {
  var d = {deopt: false};
  assertEquals(s, f(mkT(), d));
  assertEquals(s, f(mkT(), d));
  assertEquals(s, f(mkT(), d));
  %OptimizeFunctionOnNextCall(f);
  assertEquals(s, f(mkT(), d));
  assertEquals(s, f(mkT(), {}));
}

var s = "a1b2c3d4";
function mkTable() { return { a: "1", b: "2", c: "3", d: "4" }; }


tryFunction(s, mkTable, a);
tryFunction(s, mkTable, b);
tryFunction("0a1b2c3d", function () { return "abcd"; }, c);
tryFunction("0a1b2c3d", function () {
  var cnt = false;
  return function () {
    cnt = true;
    return "abcd";
  }
}, d);
tryFunction("aabbccdd", mkTable, e);

function mkSmallTable() { return { a: "1", b: "2" }; }

tryFunction("aa11ab12ba21bb22", mkSmallTable, f);
tryFunction("aa11ab12bb22ba21", mkSmallTable, g);
tryFunction("aa11ba21", mkSmallTable, h);
tryFunction("aa11ab12ba21bb22", mkSmallTable, j);
tryFunction("aa11ba21", mkSmallTable, h);
tryFunction("aa11ba21", mkSmallTable, k);
tryFunction("aa11", mkSmallTable, l);
tryFunction("aa11", mkSmallTable, m);

// Test handling of null.
tryFunction("", function () {
  return function () { return null; }
}, function (t) {
  for (var i in t()) { return i; }
  return "";
});

// Test smis.
tryFunction("", function () {
  return function () { return 11; }
}, function (t) {
  for (var i in t()) { return i; }
  return "";
});

// Test LoadFieldByIndex for out of object properties.
function O() { this.a = 1; }
for (var i = 0; i < 10; i++) new O();
tryFunction("a1b2c3d4e5f6", function () {
  var o = new O();
  o.b = 2;
  o.c = 3;
  o.d = 4;
  o.e = 5;
  o.f = 6;
  return o;
}, function (t) {
  var r = [];
  for (var i in t) r.push(i + t[i]);
  return r.join('');
});

// Test OSR inside for-in.
function osr_inner(t, limit) {
  var r = 1;
  for (var x in t) {
    if (t.hasOwnProperty(x)) {
      for (var i = 0; i < t[x].length; i++) {
        r += t[x][i];
        if (i === limit) {
          %OptimizeFunctionOnNextCall(osr_inner, "osr");
        }
      }
      r += x;
    }
  }
  return r;
}

function osr_outer(t, osr_after) {
  var r = 1;
  for (var x in t) {
    for (var i = 0; i < t[x].length; i++) {
      r += t[x][i];
    }
    if (x === osr_after) {
      %OptimizeFunctionOnNextCall(osr_outer, "osr");
    }
    r += x;
  }
  return r;
}

function osr_outer_and_deopt(t, osr_after) {
  var r = 1;
  for (var x in t) {
    r += x;
    if (x == osr_after) {
      %OptimizeFunctionOnNextCall(osr_outer_and_deopt, "osr");
    }
  }
  return r;
}

function test_osr() {
  with ({}) {}  // Disable optimizations of this function.
  var arr = new Array(20);
  for (var i = 0; i < arr.length; i++) {
    arr[i] = i + 1;
  }
  arr.push(":");  // Force deopt at the end of the loop.
  assertEquals("211:x1234567891011121314151617181920:y", osr_inner({x: arr, y: arr}, (arr.length / 2) | 0));
  assertEquals("7x456y", osr_outer({x: [1,2,3], y: [4,5,6]}, "x"));
  assertEquals("101234567", osr_outer_and_deopt([1,2,3,4,5,6,7,8], "5"));
}

test_osr();