v8/test/mjsunit/compiler/delete.js

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// 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.
// Tests of unary delete in cases where it is always true or always false.
// In an effect context, expression is always true.
assertEquals(undefined, void (delete 0));
// In an effect context, expression is always false.
assertEquals(undefined, (function (x) { delete x; })(0));
// In a pure test context, expression is always true.
assertEquals(1, (delete 0) ? 1 : 2);
// In a pure test context, expression is always false.
assertEquals(2, (function (x) { return (delete x) ? 1 : 2; })(0));
// In a negated test context, expression is always false.
assertEquals(1, (function (x) { return !(delete x) ? 1 : 2; })(0));
// In a hybrid test/value context, expression is always true, value
// expected in accumulator.
assertEquals(3, 1 + ((delete 0) && 2));
// In a hybrid test/value context, expression is always false, value
// expected in accumulator.
assertEquals(false, (function (x) { return (delete x) && 2; })(0));
// In a hybrid test/value context, expression is always true, value
// expected on stack.
assertEquals(3, ((delete 0) && 2) + 1);
// In a hybrid test/value context, expression is always false, value
// expected on stack.
assertEquals(1, (function (x) { return ((delete x) && 2) + 1; })(0));
// In a hybrid value/test context, expression is always true, value
// expected in accumulator.
assertEquals(2, 1 + ((delete 0) || 2));
// In a hybrid value/test context, expression is always false, value
// expected in accumulator.
assertEquals(2, (function (x) { return (delete x) || 2; })(0));
// In a hybrid value/test context, expression is always true, value
// expected on stack.
assertEquals(2, ((delete 0) || 2) + 1);
// In a hybrid value/test context, expression is always false, value
// expected on stack.
assertEquals(3, (function (x) { return ((delete x) || 2) + 1; })(0));
// 'this' at toplevel is different from all other global variables---not
// deletable.
assertEquals(true, delete this);