util.inspect fails to log getters which access this

[szmarczak]

• Version: v15.0.1
• Platform: Linux solus 5.6.19-159.current #1 SMP PREEMPT Fri Oct 16 17:49:06 UTC 2020 x86_64 GNU/Linux
• Subsystem: util

What steps will reproduce the bug?

const util = require('util');

class X {
    constructor() {
		this._y = 123;
	}

	get y() {
		return this._y;
	}
}

console.log(util.inspect(new X(), {
	colors: true,
    getters: true,
    showHidden: true
}));

How often does it reproduce? Is there a required condition?

Always.

What is the expected behavior?

X { _y: 123, [y]: [Getter: 123] }

What do you see instead?

X { _y: 123, [y]: [Getter: undefined] }

Additional information

May be related with #35956

[targos]

@nodejs/util

[BridgeAR]

diff --git a/lib/internal/util/inspect.js b/lib/internal/util/inspect.js
index e6787760fe..9343b0772f 100644
--- a/lib/internal/util/inspect.js
+++ b/lib/internal/util/inspect.js
@@ -628,7 +628,7 @@ function addPrototypeProperties(ctx, main, obj, recurseTimes, output) {
         continue;
       }
       const value = formatProperty(
-        ctx, obj, recurseTimes, key, kObjectType, desc);
+        ctx, obj, recurseTimes, key, kObjectType, desc, main);
       if (ctx.colors) {
         // Faint!
         output.push(`\u001b[2m${value}\u001b[22m`);
@@ -1678,7 +1678,7 @@ function formatPromise(ctx, value, recurseTimes) {
   return output;
 }
 
-function formatProperty(ctx, value, recurseTimes, key, type, desc) {
+function formatProperty(ctx, value, recurseTimes, key, type, desc, original = value) {
   let name, str;
   let extra = ' ';
   desc = desc || ObjectGetOwnPropertyDescriptor(value, key) ||
@@ -1699,7 +1699,7 @@ function formatProperty(ctx, value, recurseTimes, key, type, desc) {
           (ctx.getters === 'get' && desc.set === undefined) ||
           (ctx.getters === 'set' && desc.set !== undefined))) {
       try {
-        const tmp = value[key];
+        const tmp = desc.get.call(original);
         ctx.indentationLvl += 2;
         if (tmp === null) {
           str = `${s(`[${label}:`, sp)} ${s('null', 'null')}${s(']', sp)}`;

This would be a functional fix. I did not yet check if this causes a performance regression due to mismatching the arguments count frequently.