test_envChain_subscript.js

Enable keyboard shortcuts

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

// Verify the environment chain for subscripts described in

// js/src/vm/EnvironmentObject.h.

add_task(async function() {

  const target = {};

  Services.scriptloader.loadSubScript(`data:,

var qualified = 10;

unqualified = 20;

let lexical = 30;

this.prop = 40;

const funcs = Cu.getJSTestingFunctions();

const envs = [];

let env = funcs.getInnerMostEnvironmentObject();

while (env) {

  envs.push({

    type: funcs.getEnvironmentObjectType(env) || "*global*",

    qualified: !!Object.getOwnPropertyDescriptor(env, "qualified"),

    unqualified: !!Object.getOwnPropertyDescriptor(env, "unqualified"),

    lexical: !!Object.getOwnPropertyDescriptor(env, "lexical"),

    prop: !!Object.getOwnPropertyDescriptor(env, "prop"),

});

  env = funcs.getEnclosingEnvironmentObject(env);

this.ENVS = envs;

`, target);

  const envs = target.ENVS;

  Assert.equal(envs.length, 4);

  let i = 0, env;

  env = envs[i]; i++;

  Assert.equal(env.type, "NonSyntacticLexicalEnvironmentObject");

  Assert.equal(env.qualified, false);

  Assert.equal(env.unqualified, false);

  Assert.equal(env.lexical, true, "lexical must live in the NSLEO");

  Assert.equal(env.prop, false);

  env = envs[i]; i++;

  Assert.equal(env.type, "WithEnvironmentObject");

  Assert.equal(env.qualified, true, "qualified var must live in the with env");

  Assert.equal(env.unqualified, false);

  Assert.equal(env.lexical, false);

  Assert.equal(env.prop, true, "this property must live in the with env");

  env = envs[i]; i++;

  Assert.equal(env.type, "GlobalLexicalEnvironmentObject");

  Assert.equal(env.qualified, false);

  Assert.equal(env.unqualified, false);

  Assert.equal(env.lexical, false);

  Assert.equal(env.prop, false);

  env = envs[i]; i++;

  Assert.equal(env.type, "*global*");

  Assert.equal(env.qualified, false);

  Assert.equal(env.unqualified, true, "unqualified var must live in the global");

  Assert.equal(env.lexical, false);

  Assert.equal(env.prop, false);

  Assert.equal(target.qualified, 10, "qualified var must be reflected to the target object");

  Assert.equal(target.prop, 40, "this property must be reflected to the target object");

});