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669 lines
13 KiB
JavaScript
669 lines
13 KiB
JavaScript
// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Test Annex B 3.3 semantics for functions declared in blocks in sloppy mode.
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// http://www.ecma-international.org/ecma-262/6.0/#sec-block-level-function-declarations-web-legacy-compatibility-semantics
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(function overridingLocalFunction() {
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var x = [];
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assertEquals('function', typeof f);
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function f() {
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x.push(1);
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}
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f();
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{
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f();
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function f() {
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x.push(2);
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}
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f();
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}
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f();
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{
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f();
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function f() {
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x.push(3);
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}
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f();
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}
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f();
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assertArrayEquals([1, 2, 2, 2, 3, 3, 3], x);
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})();
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(function newFunctionBinding() {
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var x = [];
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assertEquals('undefined', typeof f);
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{
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f();
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function f() {
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x.push(2);
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}
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f();
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}
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f();
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{
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f();
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function f() {
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x.push(3);
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}
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f();
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}
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f();
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assertArrayEquals([2, 2, 2, 3, 3, 3], x);
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})();
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(function shadowingLetDoesntBind() {
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let f = 1;
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assertEquals(1, f);
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{
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let y = 3;
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function f() {
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y = 2;
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}
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f();
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assertEquals(2, y);
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}
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assertEquals(1, f);
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})();
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(function shadowingLetDoesntBindGenerator() {
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let f = function *f() {
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while(true) {
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yield 1;
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}
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};
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assertEquals(1, f().next().value);
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{
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function *f() {
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while(true) {
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yield 2;
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}
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}
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assertEquals(2, f().next().value);
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}
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assertEquals(1, f().next().value);
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})();
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(function shadowingClassDoesntBind() {
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class f { }
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assertEquals('class f { }', f.toString());
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{
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let y = 3;
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function f() {
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y = 2;
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}
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f();
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assertEquals(2, y);
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}
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assertEquals('class f { }', f.toString());
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})();
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(function shadowingConstDoesntBind() {
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const f = 1;
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assertEquals(1, f);
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{
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let y = 3;
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function f() {
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y = 2;
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}
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f();
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assertEquals(2, y);
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}
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assertEquals(1, f);
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})();
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(function shadowingVarBinds() {
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var f = 1;
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assertEquals(1, f);
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{
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let y = 3;
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function f() {
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y = 2;
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}
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f();
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assertEquals(2, y);
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}
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assertEquals('function', typeof f);
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})();
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(function complexParams(a = 0) {
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{
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let y = 3;
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function f(b = 0) {
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y = 2;
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}
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f();
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assertEquals(2, y);
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}
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assertEquals('function', typeof f);
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})();
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(function complexVarParams(a = 0) {
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var f;
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{
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let y = 3;
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function f(b = 0) {
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y = 2;
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}
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f();
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assertEquals(2, y);
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}
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assertEquals('function', typeof f);
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})();
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(function conditional() {
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if (true) {
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function f() { return 1; }
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} else {
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function f() { return 2; }
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}
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assertEquals(1, f());
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if (false) {
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function g() { return 1; }
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} else {
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function g() { return 2; }
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}
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assertEquals(2, g());
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})();
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(function skipExecution() {
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{
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function f() { return 1; }
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}
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assertEquals(1, f());
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{
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function f() { return 2; }
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}
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assertEquals(2, f());
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L: {
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assertEquals(3, f());
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break L;
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function f() { return 3; }
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}
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assertEquals(2, f());
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})();
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(function executionOrder() {
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function getOuter() {
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return f;
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}
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assertEquals('undefined', typeof getOuter());
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{
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assertEquals('function', typeof f);
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assertEquals('undefined', typeof getOuter());
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function f () {}
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assertEquals('function', typeof f);
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assertEquals('function', typeof getOuter());
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}
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assertEquals('function', typeof getOuter());
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})();
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(function reassignBindings() {
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function getOuter() {
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return f;
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}
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assertEquals('undefined', typeof getOuter());
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{
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assertEquals('function', typeof f);
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assertEquals('undefined', typeof getOuter());
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f = 1;
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assertEquals('number', typeof f);
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assertEquals('undefined', typeof getOuter());
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function f () {}
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assertEquals('number', typeof f);
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assertEquals('number', typeof getOuter());
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f = '';
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assertEquals('string', typeof f);
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assertEquals('number', typeof getOuter());
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}
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assertEquals('number', typeof getOuter());
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})();
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// Test that shadowing arguments is fine
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(function shadowArguments(x) {
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assertArrayEquals([1], arguments);
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{
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assertEquals('function', typeof arguments);
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function arguments() {}
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assertEquals('function', typeof arguments);
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}
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assertEquals('function', typeof arguments);
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})(1);
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// Don't shadow simple parameter
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(function shadowingParameterDoesntBind(x) {
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assertEquals(1, x);
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{
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function x() {}
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}
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assertEquals(1, x);
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})(1);
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// Don't shadow complex parameter
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(function shadowingDefaultParameterDoesntBind(x = 0) {
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assertEquals(1, x);
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{
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function x() {}
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}
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assertEquals(1, x);
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})(1);
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// Don't shadow nested complex parameter
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(function shadowingNestedParameterDoesntBind([[x]]) {
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assertEquals(1, x);
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{
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function x() {}
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}
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assertEquals(1, x);
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})([[1]]);
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// Don't shadow rest parameter
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(function shadowingRestParameterDoesntBind(...x) {
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assertArrayEquals([1], x);
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{
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function x() {}
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}
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assertArrayEquals([1], x);
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})(1);
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// Don't shadow complex rest parameter
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(function shadowingComplexRestParameterDoesntBind(...[x]) {
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assertArrayEquals(1, x);
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{
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function x() {}
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}
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assertArrayEquals(1, x);
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})(1);
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// Previous tests with a var declaration thrown in.
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// Don't shadow simple parameter
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(function shadowingVarParameterDoesntBind(x) {
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var x;
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assertEquals(1, x);
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{
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function x() {}
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}
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assertEquals(1, x);
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})(1);
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// Don't shadow complex parameter
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(function shadowingVarDefaultParameterDoesntBind(x = 0) {
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var x;
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assertEquals(1, x);
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{
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function x() {}
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}
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assertEquals(1, x);
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})(1);
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// Don't shadow nested complex parameter
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(function shadowingVarNestedParameterDoesntBind([[x]]) {
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var x;
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assertEquals(1, x);
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{
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function x() {}
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}
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assertEquals(1, x);
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})([[1]]);
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// Don't shadow rest parameter
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(function shadowingVarRestParameterDoesntBind(...x) {
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var x;
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assertArrayEquals([1], x);
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{
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function x() {}
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}
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assertArrayEquals([1], x);
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})(1);
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// Don't shadow complex rest parameter
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(function shadowingVarComplexRestParameterDoesntBind(...[x]) {
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var x;
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assertArrayEquals(1, x);
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{
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function x() {}
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}
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assertArrayEquals(1, x);
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})(1);
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// Hoisting is not affected by other simple parameters
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(function irrelevantParameterBinds(y, z) {
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assertEquals(undefined, x);
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{
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function x() {}
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}
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assertEquals('function', typeof x);
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})(1);
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// Hoisting is not affected by other complex parameters
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(function irrelevantComplexParameterBinds([y] = [], z) {
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assertEquals(undefined, x);
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{
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function x() {}
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}
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assertEquals('function', typeof x);
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})();
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// Hoisting is not affected by rest parameters
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(function irrelevantRestParameterBinds(y, ...z) {
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assertEquals(undefined, x);
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{
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function x() {}
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}
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assertEquals('function', typeof x);
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})();
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// Hoisting is not affected by complex rest parameters
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(function irrelevantRestParameterBinds(y, ...[z]) {
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assertEquals(undefined, x);
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{
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function x() {}
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}
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assertEquals('function', typeof x);
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})();
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// Test that shadowing function name is fine
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{
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let called = false;
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(function shadowFunctionName() {
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if (called) assertUnreachable();
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called = true;
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{
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function shadowFunctionName() {
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return 0;
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}
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assertEquals(0, shadowFunctionName());
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}
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assertEquals(0, shadowFunctionName());
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})();
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}
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{
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let called = false;
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(function shadowFunctionNameWithComplexParameter(...r) {
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if (called) assertUnreachable();
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called = true;
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{
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function shadowFunctionNameWithComplexParameter() {
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return 0;
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}
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assertEquals(0, shadowFunctionNameWithComplexParameter());
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}
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assertEquals(0, shadowFunctionNameWithComplexParameter());
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})();
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}
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(function shadowOuterVariable() {
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{
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let f = 0;
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(function () {
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assertEquals(undefined, f);
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{
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assertEquals(1, f());
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function f() { return 1; }
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assertEquals(1, f());
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}
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assertEquals(1, f());
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})();
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assertEquals(0, f);
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}
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})();
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(function notInDefaultScope() {
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var y = 1;
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(function innerNotInDefaultScope(x = y) {
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assertEquals('undefined', typeof y);
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{
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function y() {}
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}
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assertEquals('function', typeof y);
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assertEquals(1, x);
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})();
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})();
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(function noHoistingThroughNestedLexical() {
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{
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let f = 2;
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{
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let y = 3;
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function f() {
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y = 2;
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}
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f();
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assertEquals(2, y);
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}
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assertEquals(2, f);
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}
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assertThrows(()=>f, ReferenceError);
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})();
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// Only the first function is hoisted; the second is blocked by the first.
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// Contrast overridingLocalFunction, in which the outer function declaration
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// is not lexical and so the inner declaration is hoisted.
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(function noHoistingThroughNestedFunctions() {
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assertEquals(undefined, f); // Also checks that the var-binding exists
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{
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assertEquals(4, f());
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function f() {
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return 4;
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}
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{
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assertEquals(5, f());
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function f() {
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return 5;
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}
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assertEquals(5, f());
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}
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assertEquals(4, f());
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}
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assertEquals(4, f());
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})();
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// B.3.5 interacts with B.3.3 to allow this.
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(function hoistingThroughSimpleCatch() {
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assertEquals(undefined, f);
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try {
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throw 0;
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} catch (f) {
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{
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assertEquals(4, f());
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function f() {
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return 4;
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}
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assertEquals(4, f());
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}
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assertEquals(0, f);
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}
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assertEquals(4, f());
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})();
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(function noHoistingThroughComplexCatch() {
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try {
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throw 0;
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} catch ({f}) {
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{
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assertEquals(4, f());
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function f() {
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return 4;
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}
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assertEquals(4, f());
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}
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}
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assertThrows(()=>f, ReferenceError);
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})();
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(function hoistingThroughWith() {
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with ({f: 0}) {
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assertEquals(0, f);
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{
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assertEquals(4, f());
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function f() {
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return 4;
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}
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assertEquals(4, f());
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}
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assertEquals(0, f);
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}
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assertEquals(4, f());
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})();
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// Test that hoisting from blocks does happen in global scope
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function globalHoisted() { return 0; }
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{
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function globalHoisted() { return 1; }
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}
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assertEquals(1, globalHoisted());
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// Also happens when not previously defined
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assertEquals(undefined, globalUndefinedHoisted);
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{
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function globalUndefinedHoisted() { return 1; }
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}
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assertEquals(1, globalUndefinedHoisted());
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var globalUndefinedHoistedDescriptor =
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Object.getOwnPropertyDescriptor(this, "globalUndefinedHoisted");
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assertFalse(globalUndefinedHoistedDescriptor.configurable);
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assertTrue(globalUndefinedHoistedDescriptor.writable);
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assertTrue(globalUndefinedHoistedDescriptor.enumerable);
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assertEquals(1, globalUndefinedHoistedDescriptor.value());
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// When a function property is hoisted, it should be
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// made enumerable.
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// BUG(v8:4451)
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Object.defineProperty(this, "globalNonEnumerable", {
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value: false,
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configurable: true,
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writable: true,
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enumerable: false
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});
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eval("{function globalNonEnumerable() { return 1; }}");
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var globalNonEnumerableDescriptor
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= Object.getOwnPropertyDescriptor(this, "globalNonEnumerable");
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// BUG(v8:4451): Should be made non-configurable
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assertTrue(globalNonEnumerableDescriptor.configurable);
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assertTrue(globalNonEnumerableDescriptor.writable);
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// BUG(v8:4451): Should be made enumerable
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assertFalse(globalNonEnumerableDescriptor.enumerable);
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assertEquals(1, globalNonEnumerableDescriptor.value());
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// When a function property is hoisted, it should be overwritten and
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// made writable and overwritten, even if the property was non-writable.
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Object.defineProperty(this, "globalNonWritable", {
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value: false,
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configurable: true,
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writable: false,
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enumerable: true
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});
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eval("{function globalNonWritable() { return 1; }}");
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var globalNonWritableDescriptor
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= Object.getOwnPropertyDescriptor(this, "globalNonWritable");
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// BUG(v8:4451): Should be made non-configurable
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assertTrue(globalNonWritableDescriptor.configurable);
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// BUG(v8:4451): Should be made writable
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assertFalse(globalNonWritableDescriptor.writable);
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assertFalse(globalNonEnumerableDescriptor.enumerable);
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// BUG(v8:4451): Should be overwritten
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assertEquals(false, globalNonWritableDescriptor.value);
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// Test that hoisting from blocks does happen in an eval
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eval(`
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function evalHoisted() { return 0; }
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{
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function evalHoisted() { return 1; }
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}
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assertEquals(1, evalHoisted());
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`);
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// Test that hoisting from blocks happens from eval in a function
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!function() {
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eval(`
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function evalInFunctionHoisted() { return 0; }
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{
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function evalInFunctionHoisted() { return 1; }
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}
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assertEquals(1, evalInFunctionHoisted());
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`);
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}();
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(function evalHoistingThroughSimpleCatch() {
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try {
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throw 0;
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} catch (f) {
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eval(`{ function f() {
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return 4;
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} }`);
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assertEquals(0, f);
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}
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assertEquals(4, f());
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})();
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(function evalHoistingThroughWith() {
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with ({f: 0}) {
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eval(`{ function f() {
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return 4;
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} }`);
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|
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assertEquals(0, f);
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}
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assertEquals(4, f());
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})();
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let dontHoistGlobal;
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{ function dontHoistGlobal() {} }
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assertEquals(undefined, dontHoistGlobal);
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let dontHoistEval;
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var throws = false;
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try {
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|
eval("{ function dontHoistEval() {} }");
|
|
} catch (e) {
|
|
throws = true;
|
|
}
|
|
assertFalse(throws);
|
|
|
|
// When the global object is frozen, silently don't hoist
|
|
// Currently this actually throws BUG(v8:4452)
|
|
Object.freeze(this);
|
|
{
|
|
let throws = false;
|
|
try {
|
|
eval('{ function hoistWhenFrozen() {} }');
|
|
} catch (e) {
|
|
throws = true;
|
|
}
|
|
assertFalse(this.hasOwnProperty("hoistWhenFrozen"));
|
|
assertThrows(() => hoistWhenFrozen, ReferenceError);
|
|
// Should be assertFalse BUG(v8:4452)
|
|
assertTrue(throws);
|
|
}
|