bug1675755-forceLexicalInitializationByName.js

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load(libdir + "asserts.js");

var g = newGlobal({newCompartment: true});

var dbg = new Debugger;

var gw = dbg.addDebuggee(g);

let errorOne, errorTwo;

function evalErrorStr(global, evalString) {

    try {

        global.evaluate(evalString);

        return undefined;

    } catch (e) {

        return e.toString();

assertEq(evalErrorStr(g, "let y = IDONTEXIST;"), "ReferenceError: IDONTEXIST is not defined");

assertEq(evalErrorStr(g, "y = 1;"),

         "ReferenceError: can't access lexical declaration 'y' before initialization");

const LINEAR_SEARCHES_MAX = 3;

const SHAPE_CACHE_MIN_ENTRIES = 3;

// Give the lexical enough properties so that it isBigEnoughForAShapeTable().

for (i in [...Array(SHAPE_CACHE_MIN_ENTRIES)])

    gw.executeInGlobal(`let x${i} = 1`);

// Search for y just enough times to cause the next search to trigger

// Shape::cachify().

for (i in [...Array(LINEAR_SEARCHES_MAX - 1)])

    gw.executeInGlobal("y");

// Here we flip the uninitialized binding to undefined. But in the process, we

// will do the lookup on y that will trigger Shape::cachify. Verify that it

// happens in the correct compartment.

assertEq(gw.forceLexicalInitializationByName("y"), true);