v8/test/mjsunit/optimized-map.js

// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --allow-natives-syntax --expose-gc --turbo-inline-array-builtins
// Flags: --opt --no-always-opt

var a = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,0,0];
var b = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25];
var c = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25];

// Unknown field access leads to soft-deopt unrelated to map, should still
// lead to correct result.
(function() {
  var result = 0;
  var eagerDeoptInCalled = function(deopt) {
    var callback = function(v,i,o) {
      result += v;
      if (i == 13 && deopt) {
        a.abc = 25;
      }
      return v;
    }
    a.map(callback);
  }
  eagerDeoptInCalled();
  eagerDeoptInCalled();
  %OptimizeFunctionOnNextCall(eagerDeoptInCalled);
  eagerDeoptInCalled();
  eagerDeoptInCalled(true);
  eagerDeoptInCalled();
  assertEquals(1500, result);
})();

// Length change detected during loop, must cause properly handled eager deopt.
(function() {
  var result = 0;
  var eagerDeoptInCalled = function(deopt) {
    var callback = function(v,i,o) {
      result += v;
      a.length = (i == 13 && deopt) ? 25 : 27;
      return v;
    }
    a.map(callback);
  }
  eagerDeoptInCalled();
  eagerDeoptInCalled();
  %OptimizeFunctionOnNextCall(eagerDeoptInCalled);
  eagerDeoptInCalled();
  eagerDeoptInCalled(true);
  eagerDeoptInCalled();
  assertEquals(1500, result);
})();

// Escape analyzed array
(function() {
  var result = 0;
  var eagerDeoptInCalled = function(deopt) {
    var a_noescape = [0,1,2,3,4,5];
    var callback = function(v,i,o) {
      result += v;
      if (i == 13 && deopt) {
        a_noescape.length = 25;
      }
      return v;
    }
    a_noescape.map(callback);
  }
  eagerDeoptInCalled();
  eagerDeoptInCalled();
  %OptimizeFunctionOnNextCall(eagerDeoptInCalled);
  eagerDeoptInCalled();
  eagerDeoptInCalled(true);
  eagerDeoptInCalled();
  assertEquals(75, result);
})();

// Escape analyzed array where callback function isn't inlined, forcing a lazy
// deopt with GC that relies on the stashed-away return result fro the lazy
// deopt being properly stored in a place on the stack that gets GC'ed.
(function() {
  var result = 0;
  var lazyDeopt = function(deopt) {
    var b = [1,2,3];
    var callback = function(v,i,o) {
      result += i;
      if (i == 1 && deopt) {
        %DeoptimizeFunction(lazyDeopt);
      }
      gc(); gc();
      return v;
    };
    %NeverOptimizeFunction(callback);
    b.map(callback);
  }
  lazyDeopt();
  lazyDeopt();
  %OptimizeFunctionOnNextCall(lazyDeopt);
  lazyDeopt();
  lazyDeopt(true);
  lazyDeopt();
})();

// Escape analyzed array where callback function isn't inlined, forcing a lazy
// deopt. Check that the result of the callback function is passed correctly
// to the lazy deopt and that the final result of map is as expected.
(function() {
  var lazyDeopt = function(deopt) {
    var b = [1,2,3];
    var callback = function(v,i,o) {
      if (i == 1 && deopt) {
        %DeoptimizeFunction(lazyDeopt);
      }
      return 2 * v;
    };
    %NeverOptimizeFunction(callback);
    return b.map(callback);
  }
  assertEquals([2,4,6], lazyDeopt());
  assertEquals([2,4,6], lazyDeopt());
  %OptimizeFunctionOnNextCall(lazyDeopt);
  assertEquals([2,4,6], lazyDeopt(true));
})();

// Lazy deopt from runtime call from inlined callback function.
(function() {
  var result = 0;
  var lazyDeopt = function(deopt) {
    var callback = function(v,i,o) {
      result += i;
      if (i == 13 && deopt) {
          %DeoptimizeNow();
      }
      return v;
    }
    b.map(callback);
  }
  lazyDeopt();
  lazyDeopt();
  %OptimizeFunctionOnNextCall(lazyDeopt);
  lazyDeopt();
  lazyDeopt(true);
  lazyDeopt();
  assertEquals(1500, result);
})();

// Lazy deopt from runtime call from non-inline callback function.
(function() {
  var result = 0;
  var lazyDeopt = function(deopt) {
    var callback = function(v,i,o) {
      result += i;
      if (i == 13 && deopt) {
          %DeoptimizeNow();
      }
      return v;
    };
    %NeverOptimizeFunction(callback);
    b.map(callback);
  }
  lazyDeopt();
  lazyDeopt();
  %OptimizeFunctionOnNextCall(lazyDeopt);
  lazyDeopt();
  lazyDeopt(true);
  lazyDeopt();
  assertEquals(1500, result);
})();

(function() {
  var result = 0;
  var lazyDeopt = function(deopt) {
    var callback = function(v,i,o) {
      result += i;
      if (i == 13 && deopt) {
          %DeoptimizeNow();
          gc();
          gc();
          gc();
      }
      return v;
    }
    c.map(callback);
  }
  lazyDeopt();
  lazyDeopt();
  %OptimizeFunctionOnNextCall(lazyDeopt);
  lazyDeopt();
  lazyDeopt(true);
  lazyDeopt();
  assertEquals(1500, result);
})();

// Call to a.map is done inside a try-catch block and the callback function
// being called actually throws.
(function() {
  var caught = false;
  var result = 0;
  var lazyDeopt = function(deopt) {
    var callback = function(v,i,o) {
      result += i;
      if (i == 1 && deopt) {
        throw("a");
      }
      return v;
    }
    try {
      c.map(callback);
    } catch (e) {
      caught = true;
    }
  }
  lazyDeopt();
  lazyDeopt();
  %OptimizeFunctionOnNextCall(lazyDeopt);
  lazyDeopt();
  assertDoesNotThrow(lazyDeopt.bind(this, true));
  assertTrue(caught);
  lazyDeopt();
})();

// Call to a.map is done inside a try-catch block and the callback function
// being called actually throws, but the callback is not inlined.
(function() {
  var caught = false;
  var result = 0;
  var lazyDeopt = function(deopt) {
    var callback = function(v,i,o) {
      result += i;
      if (i == 1 && deopt) {
        throw("a");
      }
      return v;
    };
    %NeverOptimizeFunction(callback);
    try {
      c.map(callback);
    } catch (e) {
      caught = true;
    }
  }
  lazyDeopt();
  lazyDeopt();
  %OptimizeFunctionOnNextCall(lazyDeopt);
  lazyDeopt();
  assertDoesNotThrow(lazyDeopt.bind(this, true));
  assertTrue(caught);
  lazyDeopt();
})();

// Call to a.map is done inside a try-catch block and the callback function
// being called throws into a deoptimized caller function.
(function TestThrowIntoDeoptimizedOuter() {
  var a = [1,2,3,4];
  var lazyDeopt = function(deopt) {
    var callback = function(v,i,o) {
      if (i == 1 && deopt) {
        %DeoptimizeFunction(lazyDeopt);
        throw "some exception";
      }
      return 2 * v;
    };
    %NeverOptimizeFunction(callback);
    var result = 0;
    try {
      result = a.map(callback);
    } catch (e) {
      assertEquals("some exception", e)
      result = "nope";
    }
    return result;
  }
  assertEquals([2,4,6,8], lazyDeopt(false));
  assertEquals([2,4,6,8], lazyDeopt(false));
  assertEquals("nope", lazyDeopt(true));
  assertEquals("nope", lazyDeopt(true));
  %OptimizeFunctionOnNextCall(lazyDeopt);
  assertEquals([2,4,6,8], lazyDeopt(false));
  assertEquals("nope", lazyDeopt(true));
})();

(function() {
  var re = /Array\.map/;
  var lazyDeopt = function(deopt) {
    var b = [1,2,3];
    var result = 0;
    var callback = function(v,i,o) {
      result += v;
      if (i == 1) {
        var e = new Error();
        assertTrue(re.exec(e.stack) !== null);
      }
      return v;
    };
    var o = [1,2,3];
    b.map(callback);
  }
  lazyDeopt();
  lazyDeopt();
  %OptimizeFunctionOnNextCall(lazyDeopt);
  lazyDeopt();
})();

(function() {
  var re = /Array\.map/;
  var lazyDeopt = function(deopt) {
    var b = [1,2,3];
    var result = 0;
    var callback = function(v,i,o) {
      result += v;
      if (i == 1) {
        var e = new Error();
        assertTrue(re.exec(e.stack) !== null);
      }
      return v;
    };
    %NeverOptimizeFunction(callback);
    var o = [1,2,3];
    b.map(callback);
  }
  lazyDeopt();
  lazyDeopt();
  %OptimizeFunctionOnNextCall(lazyDeopt);
  lazyDeopt();
})();

(function() {
  var re = /Array\.map/;
  var lazyDeopt = function(deopt) {
    var b = [1,2,3];
    var result = 0;
    var callback = function(v,i,o) {
      result += v;
      if (i == 1) {
        %DeoptimizeNow();
      } else if (i == 2) {
        var e = new Error();
        assertTrue(re.exec(e.stack) !== null);
      }
      return v;
    };
    var o = [1,2,3];
    b.map(callback);
  }
  lazyDeopt();
  lazyDeopt();
  %OptimizeFunctionOnNextCall(lazyDeopt);
  lazyDeopt();
})();

(function() {
  var re = /Array\.map/;
  var a = [1,2,3];
  var result = 0;
  var lazyDeopt = function() {
    var callback = function(v,i,o) {
      result += i;
      if (i == 1) {
        %DeoptimizeFunction(lazyDeopt);
        throw new Error();
      }
      return v;
    };
    a.map(callback);
  }
  assertThrows(() => lazyDeopt());
  assertThrows(() => lazyDeopt());
  try {
    lazyDeopt();
  } catch (e) {
    assertTrue(re.exec(e.stack) !== null);
  }
  %OptimizeFunctionOnNextCall(lazyDeopt);
  try {
    lazyDeopt();
  } catch (e) {
    assertTrue(re.exec(e.stack) !== null);
  }
})();

// Verify that we remain in optimized code despite transitions in the output
// array.
(function() {
  var result = 0;
  var to_double = function() {
    var callback = function(v,i,o) {
      result += v;
      if (i < 5) {
        // First transition the output array to PACKED_DOUBLE_ELEMENTS.
        return v + 0.5;
      } else {
        // Then return smi values and make sure they can live in the double
        // array.
        return v;
      }
    }
    return c.map(callback);
  }
  to_double();
  to_double();
  %OptimizeFunctionOnNextCall(to_double);
  var output = to_double();
  assertTrue(%HasDoubleElements(output));
  assertEquals(1.5, output[0]);
  assertEquals(6, output[5]);
  assertEquals(975, result);
  assertOptimized(to_double);
})();

(function() {
  var result = 0;
  var to_fast = function() {
    var callback = function(v,i,o) {
      result += v;
      if (i < 5) {
        // First transition the output array to PACKED_DOUBLE_ELEMENTS.
        return v + 0.5;
      } else if (i < 10) {
        // Then return smi values and make sure they can live in the double
        // array.
        return v;
      } else {
        // Later, to PACKED_ELEMENTS.
        return v + 'hello';
      }
    }
    return c.map(callback);
  }
  to_fast();
  to_fast();
  %OptimizeFunctionOnNextCall(to_fast);
  var output = to_fast();
  %HasObjectElements(output);
  assertEquals(975, result);
  assertEquals("11hello", output[10]);
  assertOptimized(to_fast);
})();

// TurboFan specializes on number results, ensure the code path is
// tested.
(function() {
  var a = [1, 2, 3];
  function double_results() {
    // TurboFan recognizes the result is a double.
    var callback = v => v + 0.5;
    return a.map(callback);
  }
  double_results();
  double_results();
  %OptimizeFunctionOnNextCall(double_results);
  double_results();
  assertEquals(1.5, double_results()[0]);
})();

// TurboFan specializes on non-number results, ensure the code path is
// tested.
(function() {
  var a = [1, 2, 3];
  function string_results() {
    // TurboFan recognizes the result is a string.
    var callback = v => "hello" + v.toString();
    return a.map(callback);
  }
  string_results();
  string_results();
  %OptimizeFunctionOnNextCall(string_results);
  string_results();
  assertEquals("hello1", string_results()[0]);
})();

// Verify holes are not visited.
(() => {
  const a = [1, 2, , 3, 4];
  let callback_values = [];
  function withHoles() {
    callback_values = [];
    return a.map(v => {
      callback_values.push(v);
      return v;
    });
  }
  withHoles();
  withHoles();
  %OptimizeFunctionOnNextCall(withHoles);
  assertArrayEquals([1, 2, , 3, 4], withHoles());
  assertArrayEquals([1, 2, 3, 4], callback_values);
})();

(() => {
  const a = [1.5, 2.5, , 3.5, 4.5];
  let callback_values = [];
  function withHoles() {
    callback_values = [];
    return a.map(v => {
      callback_values.push(v);
      return v;
    });
  }
  withHoles();
  withHoles();
  %OptimizeFunctionOnNextCall(withHoles);
  assertArrayEquals([1.5, 2.5, , 3.5, 4.5], withHoles());
  assertArrayEquals([1.5, 2.5, 3.5, 4.5], callback_values);
})();

// Ensure that we handle side-effects between load and call.
(() => {
  function side_effect(a, b) { if (b) a.foo = 3; return a; }
  %NeverOptimizeFunction(side_effect);

  function unreliable(a, b) {
    return a.map(x => x * 2, side_effect(a, b));
  }

  let a = [1, 2, 3];
  unreliable(a, false);
  unreliable(a, false);
  %OptimizeFunctionOnNextCall(unreliable);
  unreliable(a, false);
  // Now actually do change the map.
  unreliable(a, true);
})();

// Messing with the Array species constructor causes deoptimization.
(function() {
  var result = 0;
  var a = [1,2,3];
  var species_breakage = function() {
    var callback = function(v,i,o) {
      result += v;
      return v;
    }
    a.map(callback);
  }
  species_breakage();
  species_breakage();
  %OptimizeFunctionOnNextCall(species_breakage);
  species_breakage();
  a.constructor = {};
  a.constructor[Symbol.species] = function() {};
  species_breakage();
  assertUnoptimized(species_breakage);
  assertEquals(24, result);
})();

/////////////////////////////////////////////////////////////////////////
//
// Any tests added below species_breakage won't test optimized map calls
// because the array species constructor change disables inlining of
// Array.prototype.map across the isolate.
//
/////////////////////////////////////////////////////////////////////////