JezK
Edit File: elements-transition.js
// Copyright 2012 the V8 project authors. All rights reserved. // 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. // Flags: --allow-natives-syntax --smi-only-arrays support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6,7,8)); if (support_smi_only_arrays) { print("Tests include smi-only arrays."); } else { print("Tests do NOT include smi-only arrays."); } if (support_smi_only_arrays) { function test(test_double, test_object, set, length) { // We apply the same operations to two identical arrays. The first array // triggers an IC miss, upon which the conversion stub is generated, but the // actual conversion is done in runtime. The second array, arriving at // the previously patched IC, is then converted using the conversion stub. var array_1 = new Array(length); var array_2 = new Array(length); assertTrue(%HasFastSmiElements(array_1)); assertTrue(%HasFastSmiElements(array_2)); for (var i = 0; i < length; i++) { if (i == length - 5 && test_double) { // Trigger conversion to fast double elements at length-5. set(array_1, i, 0.5); set(array_2, i, 0.5); assertTrue(%HasFastDoubleElements(array_1)); assertTrue(%HasFastDoubleElements(array_2)); } else if (i == length - 3 && test_object) { // Trigger conversion to fast object elements at length-3. set(array_1, i, 'object'); set(array_2, i, 'object'); assertTrue(%HasFastObjectElements(array_1)); assertTrue(%HasFastObjectElements(array_2)); } else if (i != length - 7) { // Set the element to an integer but leave a hole at length-7. set(array_1, i, 2*i+1); set(array_2, i, 2*i+1); } } for (var i = 0; i < length; i++) { if (i == length - 5 && test_double) { assertEquals(0.5, array_1[i]); assertEquals(0.5, array_2[i]); } else if (i == length - 3 && test_object) { assertEquals('object', array_1[i]); assertEquals('object', array_2[i]); } else if (i != length - 7) { assertEquals(2*i+1, array_1[i]); assertEquals(2*i+1, array_2[i]); } else { assertEquals(undefined, array_1[i]); assertEquals(undefined, array_2[i]); } } assertEquals(length, array_1.length); assertEquals(length, array_2.length); } test(false, false, function(a,i,v){ a[i] = v; }, 20); test(true, false, function(a,i,v){ a[i] = v; }, 20); test(false, true, function(a,i,v){ a[i] = v; }, 20); test(true, true, function(a,i,v){ a[i] = v; }, 20); test(false, false, function(a,i,v){ a[i] = v; }, 10000); test(true, false, function(a,i,v){ a[i] = v; }, 10000); test(false, true, function(a,i,v){ a[i] = v; }, 10000); test(true, true, function(a,i,v){ a[i] = v; }, 10000); // Check COW arrays function get_cow() { return [1, 2, 3]; } function transition(x) { x[0] = 1.5; } var ignore = get_cow(); transition(ignore); // Handled by runtime. var a = get_cow(); var b = get_cow(); transition(a); // Handled by IC. assertEquals(1.5, a[0]); assertEquals(1, b[0]); } else { print("Test skipped because smi only arrays are not supported."); }