envChain_object-executeInGlobalWithBindings-shadow-only-eval.js

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

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

// WithEnvironmentObject shouldn't be created if if all bindings are shadowed,

// even if the script has direct eval.

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

const dbg = new Debugger();

const gw = dbg.addDebuggee(g);

const bindings = {

  bindings_prop_var: 61,

  bindings_prop_lexical: 71,

  bindings_prop_lexical2: 71,

};

const {envs, vars} = JSON.parse(gw.executeInGlobalWithBindings(`

eval('');

var bindings_prop_var = 60;

let bindings_prop_lexical = 70;

let bindings_prop_lexical2;

bindings_prop_lexical2 = 70;

const vars = {

  bindings_prop_var,

  bindings_prop_lexical,

  bindings_prop_lexical2,

};

const envs = [];

let env = getInnerMostEnvironmentObject();

while (env) {

  envs.push({

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

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

    bindings_prop_var_value: Object.getOwnPropertyDescriptor(env, "bindings_prop_var")?.value,

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

    bindings_prop_lexical_value: Object.getOwnPropertyDescriptor(env, "bindings_prop_lexical")?.value,

    bindings_prop_lexical2: !!Object.getOwnPropertyDescriptor(env, "bindings_prop_lexical2"),

    bindings_prop_lexical2_value: Object.getOwnPropertyDescriptor(env, "bindings_prop_lexical2")?.value,

});

  env = getEnclosingEnvironmentObject(env);

JSON.stringify({envs, vars});

`, bindings).return);

assertEq(vars.bindings_prop_var, 60,

         "qualified var should read the value set by the declaration");

assertEq(vars.bindings_prop_lexical, 70,

         "lexical should read the value set by the declaration");

assertEq(vars.bindings_prop_lexical2, 70,

         "lexical should read the value set by the assignment");

assertEq(bindings.bindings_prop_var, 61,

         "the original bindings property must not be overwritten for var");

assertEq(bindings.bindings_prop_lexical, 71,

         "the original bindings property must not be overwritten for lexical");

assertEq(bindings.bindings_prop_lexical2, 71,

         "the original bindings property must not be overwritten for lexical");

assertEq(envs.length, 2,

         "WithEnvironmentObject shouldn't be created if if all bindings are " +

         "shadowed, even if the script has direct eval");

let i = 0, env;

env = envs[i]; i++;

assertEq(env.type, "GlobalLexicalEnvironmentObject");

assertEq(env.bindings_prop_var, false);

assertEq(env.bindings_prop_lexical, true,

         "lexical must live in the GlobalLexicalEnvironmentObject even if it conflicts with the bindings object property");

assertEq(env.bindings_prop_lexical_value, 70);

assertEq(env.bindings_prop_lexical2, true,

         "lexical must live in the GlobalLexicalEnvironmentObject even if it conflicts with the bindings object property");

assertEq(env.bindings_prop_lexical2_value, 70,

         "lexical value must be set by the assignment even if it conflicts with the bindings object property");

env = envs[i]; i++;

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

assertEq(env.bindings_prop_var, true,

         "qualified var binding must be created in the global even if it conflicts with the bindings object property");

assertEq(env.bindings_prop_var_value, 60,

         "qualified var value must be set even if it conflicts with the bindings object property");

assertEq(env.bindings_prop_lexical, false);

assertEq(env.bindings_prop_lexical2, false);