1427228 - Error stack shows inconsistent function name

Status: RESOLVED DUPLICATE of bug 1371591

(Core :: JavaScript Engine, defect, P3)

Description

[Kagami Rosylight [:saschanaz] (they/them)]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0
Build ID: 20171227100314

Steps to reproduce:

Slightly modified example from MDN: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name

```js
var sym1 = Symbol("foo"); 
var sym2 = "foo"
var o = { 
  [sym1]: function(){ throw new Error() },
  [sym2]: function(){ throw new Error() }
};
```


Actual results:

```
> o[sym1]
function o()
> o[sym1].name
"[foo]"
> try { o[sym1]() } catch (e) { console.error(e.stack) }
o@debugger eval code:4:29
@debugger eval code:1:7
> o[sym2]
function o()
> o[sym2].name
"foo"
> try { o[sym2]() } catch (e) { console.error(e.stack) }
o@debugger eval code:5:29
@debugger eval code:1:7
```


Expected results:

```
> o[sym1]
function [foo]()
> o[sym1].name
"[foo]"
> try { o[sym1]() } catch (e) { console.error(e.stack) }
[foo]@debugger eval code:4:29
@debugger eval code:1:7
> o[sym2]
function foo()
> o[sym2].name
"foo"
> try { o[sym2]() } catch (e) { console.error(e.stack) }
foo@debugger eval code:5:29
@debugger eval code:1:7
```

Related: https://github.com/kripken/emscripten/issues/5911

Comment 1

[Nicolas B. Pierron [:nbp]]

Waldo, would this be something you could mentor?

Comment 2

[Jeff Walden [:Waldo]]

Just looking at the testcase, I'm not sure I know off the top of my head the code paths it runs through.  I'm happy to review a patch here -- tho I'd have to learn about the code being modified to do so.  But in terms of answering ongoing questions about how to approach this or similar, I'm probably not the right person to mentor this, actually.

Comment 3

[André Bargull [:anba]]

This specific case will be fixed by bug 1371591. Also related is bug 1140680 to use the current value of the "name" property of functions in the stack trace à la V8.