d515e5138d
Previously, name conflicts between var and let declarations were only made into exceptions if they were visible at parse-time. This patch adds runtime checks so that sloppy-mode direct eval can't introduce conflicting var declarations. The change is implemented by traversing the scope chain when a direct eval introduces a var declaration to look for conflicting let declarations, up to the function boundary. BUG=v8:4454 R=adamk LOG=Y Review URL: https://codereview.chromium.org/1382513003 Cr-Commit-Position: refs/heads/master@{#31211}
110 lines
1.8 KiB
JavaScript
110 lines
1.8 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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// Flags: --harmony-sloppy --harmony-sloppy-let --harmony-sloppy-function
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// Var-let conflict in a function throws, even if the var is in an eval
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let caught = false;
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// Throws at the top level of a function
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try {
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(function() {
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let x = 1;
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eval('const x = 2');
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})()
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} catch (e) {
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caught = true;
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}
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assertTrue(caught);
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// If the eval is in its own block scope, throws
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caught = false;
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try {
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(function() {
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let y = 1;
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{ eval('const y = 2'); }
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})()
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} catch (e) {
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caught = true;
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}
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assertTrue(caught);
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// If the let is in its own block scope, with the eval, throws
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caught = false
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try {
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(function() {
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{
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let x = 1;
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eval('const x = 2');
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}
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})();
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} catch (e) {
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caught = true;
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}
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assertTrue(caught);
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// Legal if the let is no longer visible
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caught = false
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try {
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(function() {
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{
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let x = 1;
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}
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eval('const x = 2');
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})();
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} catch (e) {
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caught = true;
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}
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assertFalse(caught);
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// In global scope
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caught = false;
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try {
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let z = 1;
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eval('const z = 2');
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} catch (e) {
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caught = true;
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}
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assertTrue(caught);
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// Let declarations beyond a function boundary don't conflict
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caught = false;
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try {
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let a = 1;
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(function() {
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eval('const a');
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})();
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} catch (e) {
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caught = true;
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}
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assertFalse(caught);
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// var across with doesn't conflict
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caught = false;
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try {
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(function() {
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with ({x: 1}) {
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eval("const x = 2;");
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}
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})();
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} catch (e) {
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caught = true;
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}
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assertFalse(caught);
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// var can still conflict with let across a with
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caught = false;
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try {
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(function() {
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let x;
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with ({x: 1}) {
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eval("const x = 2;");
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}
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})();
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} catch (e) {
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caught = true;
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}
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assertTrue(caught);
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