JezK
Edit File: elements-kind.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 --expose-gc // Test element kind of objects. // Since --smi-only-arrays affects builtins, its default setting at compile // time sticks if built with snapshot. If --smi-only-arrays is deactivated // by default, only a no-snapshot build actually has smi-only arrays enabled // in this test case. Depending on whether smi-only arrays are actually // enabled, this test takes the appropriate code path to check 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."); } var elements_kind = { fast_smi_only : 'fast smi only elements', fast : 'fast elements', fast_double : 'fast double elements', dictionary : 'dictionary elements', external_byte : 'external byte elements', external_unsigned_byte : 'external unsigned byte elements', external_short : 'external short elements', external_unsigned_short : 'external unsigned short elements', external_int : 'external int elements', external_unsigned_int : 'external unsigned int elements', external_float : 'external float elements', external_double : 'external double elements', external_pixel : 'external pixel elements' } function getKind(obj) { if (%HasFastSmiElements(obj)) return elements_kind.fast_smi_only; if (%HasFastObjectElements(obj)) return elements_kind.fast; if (%HasFastDoubleElements(obj)) return elements_kind.fast_double; if (%HasDictionaryElements(obj)) return elements_kind.dictionary; // Every external kind is also an external array. assertTrue(%HasExternalArrayElements(obj)); if (%HasExternalByteElements(obj)) { return elements_kind.external_byte; } if (%HasExternalUnsignedByteElements(obj)) { return elements_kind.external_unsigned_byte; } if (%HasExternalShortElements(obj)) { return elements_kind.external_short; } if (%HasExternalUnsignedShortElements(obj)) { return elements_kind.external_unsigned_short; } if (%HasExternalIntElements(obj)) { return elements_kind.external_int; } if (%HasExternalUnsignedIntElements(obj)) { return elements_kind.external_unsigned_int; } if (%HasExternalFloatElements(obj)) { return elements_kind.external_float; } if (%HasExternalDoubleElements(obj)) { return elements_kind.external_double; } if (%HasExternalPixelElements(obj)) { return elements_kind.external_pixel; } } function assertKind(expected, obj, name_opt) { if (!support_smi_only_arrays && expected == elements_kind.fast_smi_only) { expected = elements_kind.fast; } assertEquals(expected, getKind(obj), name_opt); } var me = {}; assertKind(elements_kind.fast, me); me.dance = 0xD15C0; me.drink = 0xC0C0A; assertKind(elements_kind.fast, me); if (support_smi_only_arrays) { var too = [1,2,3]; assertKind(elements_kind.fast_smi_only, too); too.dance = 0xD15C0; too.drink = 0xC0C0A; assertKind(elements_kind.fast_smi_only, too); } // Make sure the element kind transitions from smi when a non-smi is stored. var you = new Array(); assertKind(elements_kind.fast_smi_only, you); for (var i = 0; i < 1337; i++) { var val = i; if (i == 1336) { assertKind(elements_kind.fast_smi_only, you); val = new Object(); } you[i] = val; } assertKind(elements_kind.fast, you); assertKind(elements_kind.dictionary, new Array(0xDECAF)); var fast_double_array = new Array(0xDECAF); for (var i = 0; i < 0xDECAF; i++) fast_double_array[i] = i / 2; assertKind(elements_kind.fast_double, fast_double_array); assertKind(elements_kind.external_byte, new Int8Array(9001)); assertKind(elements_kind.external_unsigned_byte, new Uint8Array(007)); assertKind(elements_kind.external_short, new Int16Array(666)); assertKind(elements_kind.external_unsigned_short, new Uint16Array(42)); assertKind(elements_kind.external_int, new Int32Array(0xF)); assertKind(elements_kind.external_unsigned_int, new Uint32Array(23)); assertKind(elements_kind.external_float, new Float32Array(7)); assertKind(elements_kind.external_double, new Float64Array(0)); assertKind(elements_kind.external_pixel, new PixelArray(512)); // Crankshaft support for smi-only array elements. function monomorphic(array) { assertKind(elements_kind.fast_smi_only, array); for (var i = 0; i < 3; i++) { array[i] = i + 10; } assertKind(elements_kind.fast_smi_only, array); for (var i = 0; i < 3; i++) { var a = array[i]; assertEquals(i + 10, a); } } var smi_only = new Array(1, 2, 3); assertKind(elements_kind.fast_smi_only, smi_only); for (var i = 0; i < 3; i++) monomorphic(smi_only); %OptimizeFunctionOnNextCall(monomorphic); monomorphic(smi_only); if (support_smi_only_arrays) { function construct_smis() { var a = [0, 0, 0]; a[0] = 0; // Send the COW array map to the steak house. assertKind(elements_kind.fast_smi_only, a); return a; } function construct_doubles() { var a = construct_smis(); a[0] = 1.5; assertKind(elements_kind.fast_double, a); return a; } function construct_objects() { var a = construct_smis(); a[0] = "one"; assertKind(elements_kind.fast, a); return a; } // Test crankshafted transition SMI->DOUBLE. function convert_to_double(array) { array[1] = 2.5; assertKind(elements_kind.fast_double, array); assertEquals(2.5, array[1]); } var smis = construct_smis(); for (var i = 0; i < 3; i++) convert_to_double(smis); %OptimizeFunctionOnNextCall(convert_to_double); smis = construct_smis(); convert_to_double(smis); // Test crankshafted transitions SMI->FAST and DOUBLE->FAST. function convert_to_fast(array) { array[1] = "two"; assertKind(elements_kind.fast, array); assertEquals("two", array[1]); } smis = construct_smis(); for (var i = 0; i < 3; i++) convert_to_fast(smis); var doubles = construct_doubles(); for (var i = 0; i < 3; i++) convert_to_fast(doubles); smis = construct_smis(); doubles = construct_doubles(); %OptimizeFunctionOnNextCall(convert_to_fast); convert_to_fast(smis); convert_to_fast(doubles); // Test transition chain SMI->DOUBLE->FAST (crankshafted function will // transition to FAST directly). function convert_mixed(array, value, kind) { array[1] = value; assertKind(kind, array); assertEquals(value, array[1]); } smis = construct_smis(); for (var i = 0; i < 3; i++) { convert_mixed(smis, 1.5, elements_kind.fast_double); } doubles = construct_doubles(); for (var i = 0; i < 3; i++) { convert_mixed(doubles, "three", elements_kind.fast); } smis = construct_smis(); doubles = construct_doubles(); %OptimizeFunctionOnNextCall(convert_mixed); convert_mixed(smis, 1, elements_kind.fast); convert_mixed(doubles, 1, elements_kind.fast); assertTrue(%HaveSameMap(smis, doubles)); } // Crankshaft support for smi-only elements in dynamic array literals. function get(foo) { return foo; } // Used to generate dynamic values. function crankshaft_test() { if (support_smi_only_arrays) { var a1 = [get(1), get(2), get(3)]; assertKind(elements_kind.fast_smi_only, a1); } var a2 = new Array(get(1), get(2), get(3)); assertKind(elements_kind.fast_smi_only, a2); var b = [get(1), get(2), get("three")]; assertKind(elements_kind.fast, b); var c = [get(1), get(2), get(3.5)]; if (support_smi_only_arrays) { assertKind(elements_kind.fast_double, c); } } for (var i = 0; i < 3; i++) { crankshaft_test(); } %OptimizeFunctionOnNextCall(crankshaft_test); crankshaft_test(); // Elements_kind transitions for arrays. // A map can have three different elements_kind transitions: SMI->DOUBLE, // DOUBLE->OBJECT, and SMI->OBJECT. No matter in which order these three are // created, they must always end up with the same FAST map. // This test is meaningless without FAST_SMI_ONLY_ELEMENTS. if (support_smi_only_arrays) { // Preparation: create one pair of identical objects for each case. var a = [1, 2, 3]; var b = [1, 2, 3]; assertTrue(%HaveSameMap(a, b)); assertKind(elements_kind.fast_smi_only, a); var c = [1, 2, 3]; c["case2"] = true; var d = [1, 2, 3]; d["case2"] = true; assertTrue(%HaveSameMap(c, d)); assertFalse(%HaveSameMap(a, c)); assertKind(elements_kind.fast_smi_only, c); var e = [1, 2, 3]; e["case3"] = true; var f = [1, 2, 3]; f["case3"] = true; assertTrue(%HaveSameMap(e, f)); assertFalse(%HaveSameMap(a, e)); assertFalse(%HaveSameMap(c, e)); assertKind(elements_kind.fast_smi_only, e); // Case 1: SMI->DOUBLE, DOUBLE->OBJECT, SMI->OBJECT. a[0] = 1.5; assertKind(elements_kind.fast_double, a); a[0] = "foo"; assertKind(elements_kind.fast, a); b[0] = "bar"; assertTrue(%HaveSameMap(a, b)); // Case 2: SMI->DOUBLE, SMI->OBJECT, DOUBLE->OBJECT. c[0] = 1.5; assertKind(elements_kind.fast_double, c); assertFalse(%HaveSameMap(c, d)); d[0] = "foo"; assertKind(elements_kind.fast, d); assertFalse(%HaveSameMap(c, d)); c[0] = "bar"; assertTrue(%HaveSameMap(c, d)); // Case 3: SMI->OBJECT, SMI->DOUBLE, DOUBLE->OBJECT. e[0] = "foo"; assertKind(elements_kind.fast, e); assertFalse(%HaveSameMap(e, f)); f[0] = 1.5; assertKind(elements_kind.fast_double, f); assertFalse(%HaveSameMap(e, f)); f[0] = "bar"; assertKind(elements_kind.fast, f); assertTrue(%HaveSameMap(e, f)); } // Test if Array.concat() works correctly with DOUBLE elements. if (support_smi_only_arrays) { var a = [1, 2]; assertKind(elements_kind.fast_smi_only, a); var b = [4.5, 5.5]; assertKind(elements_kind.fast_double, b); var c = a.concat(b); assertEquals([1, 2, 4.5, 5.5], c); // TODO(1810): Change implementation so that we get DOUBLE elements here? assertKind(elements_kind.fast, c); } // Test that Array.push() correctly handles SMI elements. if (support_smi_only_arrays) { var a = [1, 2]; assertKind(elements_kind.fast_smi_only, a); a.push(3, 4, 5); assertKind(elements_kind.fast_smi_only, a); assertEquals([1, 2, 3, 4, 5], a); } // Test that Array.splice() and Array.slice() return correct ElementsKinds. if (support_smi_only_arrays) { var a = ["foo", "bar"]; assertKind(elements_kind.fast, a); var b = a.splice(0, 1); assertKind(elements_kind.fast, b); var c = a.slice(0, 1); assertKind(elements_kind.fast, c); } // Throw away type information in the ICs for next stress run. gc();