JezK
Edit File: const-eval-init.js
// Copyright 2009 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 // Test the handling of initialization of deleted const variables. // This only makes sense in local scopes since the declaration and // initialization of consts in the global scope happen at the same // time. function testIntroduceGlobal() { var source = // Deleting 'x' removes the local const property. "delete x;" + // Initialization turns into assignment to global 'x'. "const x = 3; assertEquals(3, x);" + // No constness of the global 'x'. "x = 4; assertEquals(4, x);"; eval(source); } testIntroduceGlobal(); assertEquals(4, x); function testAssignExistingGlobal() { var source = // Delete 'x' to remove the local const property. "delete x;" + // Initialization turns into assignment to global 'x'. "const x = 5; assertEquals(5, x);" + // No constness of the global 'x'. "x = 6; assertEquals(6, x);"; eval(source); } testAssignExistingGlobal(); assertEquals(6, x); function testAssignmentArgument(x) { function local() { var source = "delete x; const x = 7; assertEquals(7, x)"; eval(source); } local(); assertEquals(7, x); } for (var i = 0; i < 5; i++) { testAssignmentArgument(); } %OptimizeFunctionOnNextCall(testAssignmentArgument); testAssignmentArgument(); assertEquals(6, x); __defineSetter__('x', function() { throw 42; }); function testAssignGlobalThrows() { // Initialization turns into assignment to global 'x' which // throws an exception. var source = "delete x; const x = 8"; eval(source); } assertThrows("testAssignGlobalThrows()"); function testInitFastCaseExtension() { var source = "const x = 9; assertEquals(9, x); x = 10; assertEquals(9, x)"; eval(source); } testInitFastCaseExtension(); function testInitSlowCaseExtension() { var source = ""; // Introduce 100 properties on the context extension object to force // it in slow case. for (var i = 0; i < 100; i++) source += ("var a" + i + " = " + i + ";"); source += "const x = 10; assertEquals(10, x); x = 11; assertEquals(10, x)"; eval(source); } testInitSlowCaseExtension(); function testAssignSurroundingContextSlot() { var x = 12; function local() { var source = "delete x; const x = 13; assertEquals(13, x)"; eval(source); } local(); assertEquals(13, x); } testAssignSurroundingContextSlot();