c23dbc1928
a const variable can be deleted between its declaration and its initialization. This fixes issue 189: http://code.google.com/p/v8/issues/detail?id=189 Review URL: http://codereview.chromium.org/18660 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1127 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
112 lines
3.7 KiB
JavaScript
112 lines
3.7 KiB
JavaScript
// Copyright 2009 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Test the handling of initialization of deleted const variables.
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// This only makes sense in local scopes since the declaration and
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// initialization of consts in the global scope happen at the same
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// time.
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function testIntroduceGlobal() {
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var source =
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// Deleting 'x' removes the local const property.
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"delete x;" +
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// Initialization turns into assignment to global 'x'.
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"const x = 3; assertEquals(3, x);" +
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// No constness of the global 'x'.
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"x = 4; assertEquals(4, x);";
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eval(source);
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}
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testIntroduceGlobal();
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assertEquals(4, x);
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function testAssignExistingGlobal() {
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var source =
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// Delete 'x' to remove the local const property.
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"delete x;" +
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// Initialization turns into assignment to global 'x'.
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"const x = 5; assertEquals(5, x);" +
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// No constness of the global 'x'.
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"x = 6; assertEquals(6, x);";
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eval(source);
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}
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testAssignExistingGlobal();
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assertEquals(6, x);
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function testAssignmentArgument(x) {
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function local() {
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var source = "delete x; const x = 7; assertEquals(7, x)";
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eval(source);
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}
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local();
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assertEquals(7, x);
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}
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testAssignmentArgument();
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assertEquals(6, x);
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__defineSetter__('x', function() { throw 42; });
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function testAssignGlobalThrows() {
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// Initialization turns into assignment to global 'x' which
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// throws an exception.
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var source = "delete x; const x = 8";
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eval(source);
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}
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assertThrows("testAssignGlobalThrows()");
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function testInitFastCaseExtension() {
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var source = "const x = 9; assertEquals(9, x); x = 10; assertEquals(9, x)";
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eval(source);
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}
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testInitFastCaseExtension();
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function testInitSlowCaseExtension() {
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var source = "";
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// Introduce 100 properties on the context extension object to force
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// it in slow case.
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for (var i = 0; i < 100; i++) source += ("var a" + i + " = i;");
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source += "const x = 10; assertEquals(10, x); x = 11; assertEquals(10, x)";
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eval(source);
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}
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testInitSlowCaseExtension();
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function testAssignSurroundingContextSlot() {
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var x = 12;
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function local() {
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var source = "delete x; const x = 13; assertEquals(13, x)";
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eval(source);
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}
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local();
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assertEquals(13, x);
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}
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testAssignSurroundingContextSlot();
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