array-literal-transitions.js 5.99 KB
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// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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// Flags: --allow-natives-syntax --expose-gc --ignition-osr --no-always-opt
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// Flags: --opt
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// IC and Crankshaft support for smi-only elements in dynamic array literals.
function get(foo) { return foo; }  // Used to generate dynamic values.

function array_literal_test() {
  var a0 = [1, 2, 3];
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  assertTrue(%HasSmiElements(a0));
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  var a1 = [get(1), get(2), get(3)];
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  assertTrue(%HasSmiElements(a1));
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  var b0 = [1, 2, get("three")];
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  assertTrue(%HasObjectElements(b0));
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  var b1 = [get(1), get(2), get("three")];
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  assertTrue(%HasObjectElements(b1));
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  var c0 = [1, 2, get(3.5)];
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  assertTrue(%HasDoubleElements(c0));
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  assertEquals(3.5, c0[2]);
  assertEquals(2, c0[1]);
  assertEquals(1, c0[0]);

  var c1 = [1, 2, 3.5];
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  assertTrue(%HasDoubleElements(c1));
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  assertEquals(3.5, c1[2]);
  assertEquals(2, c1[1]);
  assertEquals(1, c1[0]);

  var c2 = [get(1), get(2), get(3.5)];
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  assertTrue(%HasDoubleElements(c2));
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  assertEquals(3.5, c2[2]);
  assertEquals(2, c2[1]);
  assertEquals(1, c2[0]);

  var object = new Object();
  var d0 = [1, 2, object];
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  assertTrue(%HasObjectElements(d0));
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  assertEquals(object, d0[2]);
  assertEquals(2, d0[1]);
  assertEquals(1, d0[0]);

  var e0 = [1, 2, 3.5];
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  assertTrue(%HasDoubleElements(e0));
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  assertEquals(3.5, e0[2]);
  assertEquals(2, e0[1]);
  assertEquals(1, e0[0]);

  var f0 = [1, 2, [1, 2]];
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  assertTrue(%HasObjectElements(f0));
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  assertEquals([1,2], f0[2]);
  assertEquals(2, f0[1]);
  assertEquals(1, f0[0]);
}

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for (var i = 0; i < 3; i++) {
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  array_literal_test();
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}
  %OptimizeFunctionOnNextCall(array_literal_test);
array_literal_test();

function test_large_literal() {
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  function d() {
    gc();
    return 2.5;
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  }

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  function o() {
    gc();
    return new Object();
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  }
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  large =
    [ 0, 1, 2, 3, 4, 5, d(), d(), d(), d(), d(), d(), o(), o(), o(), o() ];
  assertFalse(%HasDictionaryElements(large));
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  assertFalse(%HasSmiElements(large));
  assertFalse(%HasDoubleElements(large));
  assertTrue(%HasObjectElements(large));
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  assertEquals(large,
               [0, 1, 2, 3, 4, 5, 2.5, 2.5, 2.5, 2.5, 2.5, 2.5,
                new Object(), new Object(), new Object(), new Object()]);
}

for (var i = 0; i < 3; i++) {
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  test_large_literal();
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}
  %OptimizeFunctionOnNextCall(test_large_literal);
test_large_literal();
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function deopt_array(use_literal) {
  if (use_literal) {
    return [.5, 3, 4];
  }  else {
    return new Array();
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  }
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}
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deopt_array(false);
deopt_array(false);
deopt_array(false);
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  %OptimizeFunctionOnNextCall(deopt_array);
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var array = deopt_array(false);
assertOptimized(deopt_array);
deopt_array(true);
assertOptimized(deopt_array);
array = deopt_array(false);
assertOptimized(deopt_array);

// Check that unexpected changes in the objects stored into the boilerplate
// also force a deopt.
function deopt_array_literal_all_smis(a) {
  return [0, 1, a];
}
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deopt_array_literal_all_smis(2);
deopt_array_literal_all_smis(3);
deopt_array_literal_all_smis(4);
array = deopt_array_literal_all_smis(4);
assertEquals(0, array[0]);
assertEquals(1, array[1]);
assertEquals(4, array[2]);
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%OptimizeFunctionOnNextCall(deopt_array_literal_all_smis);
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array = deopt_array_literal_all_smis(5);
array = deopt_array_literal_all_smis(6);
assertOptimized(deopt_array_literal_all_smis);
assertEquals(0, array[0]);
assertEquals(1, array[1]);
assertEquals(6, array[2]);

array = deopt_array_literal_all_smis(.5);
assertUnoptimized(deopt_array_literal_all_smis);
assertEquals(0, array[0]);
assertEquals(1, array[1]);
assertEquals(.5, array[2]);

function deopt_array_literal_all_doubles(a) {
  return [0.5, 1, a];
}
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deopt_array_literal_all_doubles(.5);
deopt_array_literal_all_doubles(.5);
deopt_array_literal_all_doubles(.5);
array = deopt_array_literal_all_doubles(0.5);
assertEquals(0.5, array[0]);
assertEquals(1, array[1]);
assertEquals(0.5, array[2]);
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%OptimizeFunctionOnNextCall(deopt_array_literal_all_doubles);
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array = deopt_array_literal_all_doubles(5);
array = deopt_array_literal_all_doubles(6);
assertOptimized(deopt_array_literal_all_doubles);
assertEquals(0.5, array[0]);
assertEquals(1, array[1]);
assertEquals(6, array[2]);

var foo = new Object();
array = deopt_array_literal_all_doubles(foo);
assertUnoptimized(deopt_array_literal_all_doubles);
assertEquals(0.5, array[0]);
assertEquals(1, array[1]);
assertEquals(foo, array[2]);
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(function literals_after_osr() {
  var color = [0];
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  // Trigger OSR.
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  while ((%GetOptimizationStatus(literals_after_osr) &
    V8OptimizationStatus.kTopmostFrameIsTurboFanned) !== 0) {}
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  return [color[0]];
})();