JezK
Edit File: simple-deopt.js
// Copyright 2010 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 function f(x) { return ~x; } f(42); assertEquals(~12, f(12.45)); assertEquals(~42, f(42.87)); var a = 1, b = 2, c = 4, d = 8; function g() { return a | (b | (c | d)); } g(); c = "16"; assertEquals(1 | 2 | 16 | 8, g()); // Test deopt when global function changes. function h() { return g(); } assertEquals(1 | 2 | 16 | 8, h()); g = function() { return 42; }; assertEquals(42, h()); // Test deopt when map changes. var obj = {}; obj.g = g; function k(o) { return o.g(); } for (var i = 0; i < 5; i++) k(obj); %OptimizeFunctionOnNextCall(k); k(obj); assertEquals(42, k(obj)); assertEquals(87, k({g: function() { return 87; }})); // Test deopt with assignments to parameters. function p(x,y) { x = 42; y = 1; y = y << "0"; return x | y; } assertEquals(43, p(0,0)); // Test deopt with literals on the expression stack. function LiteralToStack(x) { return 'lit[' + (x + ']'); } assertEquals('lit[-87]', LiteralToStack(-87)); assertEquals('lit[0]', LiteralToStack(0)); assertEquals('lit[42]', LiteralToStack(42)); // Test deopt before call. var str = "abc"; var r; function CallCharAt(n) { return str.charAt(n); } for (var i = 0; i < 5; i++) { r = CallCharAt(0); } %OptimizeFunctionOnNextCall(CallCharAt); r = CallCharAt(0); assertEquals("a", r); // Test of deopt in presence of spilling. function add4(a,b,c,d) { return a+b+c+d; } assertEquals(0x40000003, add4(1,1,2,0x3fffffff));