1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 // Flags: --allow-natives-syntax --smi-only-arrays --expose-gc 29 // Flags: --track-allocation-sites --noalways-opt 30 31 // Test element kind of objects. 32 // Since --smi-only-arrays affects builtins, its default setting at compile 33 // time sticks if built with snapshot. If --smi-only-arrays is deactivated 34 // by default, only a no-snapshot build actually has smi-only arrays enabled 35 // in this test case. Depending on whether smi-only arrays are actually 36 // enabled, this test takes the appropriate code path to check smi-only arrays. 37 38 // Reset the GC stress mode to be off. Needed because AllocationMementos only 39 // live for one gc, so a gc that happens in certain fragile areas of the test 40 // can break assumptions. 41 %SetFlags("--gc-interval=-1") 42 43 // support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6,7,8)); 44 support_smi_only_arrays = true; 45 46 if (support_smi_only_arrays) { 47 print("Tests include smi-only arrays."); 48 } else { 49 print("Tests do NOT include smi-only arrays."); 50 } 51 52 var elements_kind = { 53 fast_smi_only : 'fast smi only elements', 54 fast : 'fast elements', 55 fast_double : 'fast double elements', 56 dictionary : 'dictionary elements', 57 external_byte : 'external byte elements', 58 external_unsigned_byte : 'external unsigned byte elements', 59 external_short : 'external short elements', 60 external_unsigned_short : 'external unsigned short elements', 61 external_int : 'external int elements', 62 external_unsigned_int : 'external unsigned int elements', 63 external_float : 'external float elements', 64 external_double : 'external double elements', 65 external_pixel : 'external pixel elements' 66 } 67 68 function getKind(obj) { 69 if (%HasFastSmiElements(obj)) return elements_kind.fast_smi_only; 70 if (%HasFastObjectElements(obj)) return elements_kind.fast; 71 if (%HasFastDoubleElements(obj)) return elements_kind.fast_double; 72 if (%HasDictionaryElements(obj)) return elements_kind.dictionary; 73 } 74 75 function isHoley(obj) { 76 if (%HasFastHoleyElements(obj)) return true; 77 return false; 78 } 79 80 function assertKind(expected, obj, name_opt) { 81 if (!support_smi_only_arrays && 82 expected == elements_kind.fast_smi_only) { 83 expected = elements_kind.fast; 84 } 85 assertEquals(expected, getKind(obj), name_opt); 86 } 87 88 if (support_smi_only_arrays) { 89 90 function get_literal(x) { 91 var literal = [1, 2, x]; 92 return literal; 93 } 94 95 get_literal(3); 96 // It's important to store a from before we crankshaft get_literal, because 97 // mementos won't be created from crankshafted code at all. 98 a = get_literal(3); 99 %OptimizeFunctionOnNextCall(get_literal); 100 get_literal(3); 101 assertOptimized(get_literal); 102 assertTrue(%HasFastSmiElements(a)); 103 // a has a memento so the transition caused by the store will affect the 104 // boilerplate. 105 a[0] = 3.5; 106 107 // We should have transitioned the boilerplate array to double, and 108 // crankshafted code should de-opt on the unexpected elements kind 109 b = get_literal(3); 110 assertTrue(%HasFastDoubleElements(b)); 111 assertEquals([1, 2, 3], b); 112 assertUnoptimized(get_literal); 113 114 // Optimize again 115 get_literal(3); 116 %OptimizeFunctionOnNextCall(get_literal); 117 b = get_literal(3); 118 assertTrue(%HasFastDoubleElements(b)); 119 assertOptimized(get_literal); 120 121 122 // Test: make sure allocation site information is updated through a 123 // transition from SMI->DOUBLE->FAST 124 (function() { 125 function bar(a, b, c) { 126 return [a, b, c]; 127 } 128 129 a = bar(1, 2, 3); 130 a[0] = 3.5; 131 a[1] = 'hi'; 132 b = bar(1, 2, 3); 133 assertKind(elements_kind.fast, b); 134 })(); 135 } 136
