c42f5829a1
In the shell sample don't print the result of executing a script, only evaluating expressions. Fixed issue when building samples on Windows using a shared V8 library. Added visibility option on Linux build which makes the generated library 18% smaller. Changed build system to accept multiple build modes in one build and generate seperate objects, libraries and executables for each mode. Removed deferred negation optimization (a * -b => -(a * b)) since this visibly changes operand conversion order. Improved parsing performance by introducing stack guard in preparsing. Without a stack guard preparsing always bails out with stack overflow. git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
93 lines
2.7 KiB
JavaScript
93 lines
2.7 KiB
JavaScript
// Copyright 2008 Google Inc. 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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// const variables should be read-only
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const c = 42;
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c = 87;
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assertEquals(42, c);
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// const variables are not behaving like other JS variables when it comes
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// to scoping - in fact they behave more sanely. Inside a 'with' they do
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// not interfere with the 'with' scopes.
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(function () {
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with ({ x: 42 }) {
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const x = 7;
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}
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x = 5;
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assertEquals(7, x);
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})();
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// const variables may be declared but never initialized, in which case
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// their value is undefined.
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(function (sel) {
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if (sel == 0)
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with ({ x: 42 }) {
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const x;
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}
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else
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x = 3;
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x = 5;
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assertTrue(typeof x == 'undefined');
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})(1);
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// const variables may be initialized to undefined.
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(function () {
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with ({ x: 42 }) {
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const x = undefined;
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}
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x = 5;
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assertTrue(typeof x == 'undefined');
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})();
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// const variables may be accessed in inner scopes like any other variable.
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(function () {
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function bar() {
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assertEquals(7, x);
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}
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with ({ x: 42 }) {
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const x = 7;
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}
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x = 5
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bar();
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})();
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// const variables may be declared via 'eval'
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(function () {
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with ({ x: 42 }) {
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eval('const x = 7');
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}
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x = 5;
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assertEquals(7, x);
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})();
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