envChain_frame-eval.js

Enable keyboard shortcuts

// Verify the environment chain for Debugger.Frame described in

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

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

const dbg = Debugger(g);

dbg.onEnterFrame = frame => {

  if (frame.script.displayName !== "target") {

    return;

  dbg.onEnterFrame = () => {};

  const envs = JSON.parse(frame.eval(`

var qualified = 10;

unqualified = 20;

let lexical = 30;

this.prop = 40;

const envs = [];

let env = getInnerMostEnvironmentObject();

while (env) {

  envs.push({

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

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

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

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

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

});

  env = getEnclosingEnvironmentObject(env);

JSON.stringify(envs);

`).return);

  assertEq(envs.length, 3);

  let i = 0, env;

  // NOTE: lexical is optimized and uses frame slot.

  env = envs[i]; i++;

  assertEq(env.type, "[DebugProxy] CallObject");

  assertEq(env.qualified, true, "qualified var must live in the CallObject");

  assertEq(env.unqualified, false);

  assertEq(env.lexical, false);

  assertEq(env.prop, false);

  env = envs[i]; i++;

  assertEq(env.type, "[DebugProxy] GlobalLexicalEnvironmentObject");

  assertEq(env.qualified, false);

  assertEq(env.unqualified, false);

  assertEq(env.lexical, false);

  assertEq(env.prop, false);

  env = envs[i]; i++;

  assertEq(env.type, "*global*");

  assertEq(env.qualified, false);

  assertEq(env.unqualified, true, "unqualified name must live in the global");

  assertEq(env.lexical, false);

  assertEq(env.prop, true, "this property must live in the global");

};

g.eval(`

function target() {

target();

`);