inheritance of C/C++ Addons doesn't work

[stixx200]

• Version: v6.9.1
• Platform: Win7 SP1, 64-Bit
• Subsystem:

There is an issue with the inheritance of native node addons in Node v6.9.1.
The problem doesn't exist with Node v4.6.1 or Node v7.0.0.

To reconstruct, i used the example code of Node docs (https://nodejs.org/dist/latest-v6.x/docs/api/addons.html#addons_wrapping_c_objects) and ran the code with this example:

"use strict";
const addon = require('./build/Release/addon');
class Test extends addon.MyObject {
    constructor() {
        super();
        this.doOutput();
    }
    doOutput() {
        console.log("hello world");
    }
}
var obj = new Test();

Result is:

TypeError: this.doOutput is not a function

The problem is, that the this is empty after super() call.

[bnoordhuis]

This was fixed in V8 5.2 in commit v8/v8@73ee7943 but it also depends on commit v8/v8@306c412c which is arguably an ABI change and therefore not eligible for back-porting. I'll open a pull request for further discussion.

[bnoordhuis]

#9293

[stixx200]

@bnoordhuis Do you know, which node v6 version will fix this issue?

[addaleax]

@stixx200 Whatever version the changes in #9293 land in (if they do at all).

[bnoordhuis]

Fixed in 1d631ce...2ebceed, will be in the next v6.x release.