A question before posting an issue on bugs.chromium.org

[Oleksii Kadurin]

Hi! I'm creating an issue on https://bugs.chromium.org. And it's not so easy to find steps to reproduce the issue I would like to report about.

So maybe somebody can help me in that.

The issue is that sometimes when I debugging step by step and step into the particular function (F11) the Source panel opens a tab

that has name like "VM326". However I definitely know that the function is not a part of "eval". It's a part of external js file.

So I assume that newly opened tab should show correct file name and not "VM326".

Investigating some time I have come to the conclusion, that information about scripts comes from this line:

https://cs.chromium.org/chromium/src/third_party/WebKit/Source/devtools/front_end/sdk/Connections.js?dr&q=conne+file:%5Esrc/third_party/WebKit/Source/devtools/&sq=package:chromium&l=120

The messageEvent.data contains params.url which is empty. But usually it contains the file path.

My questions are:

1) What can be the reason of that "bad" file name in the Source tab (maybe it's known issue)

2) Since Connections.js is a part of SDK ('backend'), I can't inspect it's logic that sends messageEvent objects.

So maybe you know in what cases this._socket.onmessage (inside Connections.js) is called with the messageEvent objects,

that contains params.url as empty string. 

Thanks! 

[Oleksii Kadurin]

Here's some discussion on SO http://stackoverflow.com/questions/17367560/chrome-development-tool-vm-file-from-javascriptLooks like good point to start

Additionally my script is added via document.write. And it seems that's is the reason why the script is considered dynamic and labeled VM[xxx].

[PhistucK]

Yes, this answer shows how to get around it.

document.write is a really bad practice. :(

☆PhistucK

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[Oleksii Kadurin]

Hey, thanks for clarifying. 

>>> document.write is a really bad practice. :(

Agree. But unfortunately for me I can't (no rights) refactor it in the project I work in. 

The first time I entered the function that was in the VM326 file, I was wonder where does that file is located. 

And when made a right click on the tab's name and selected "Copy link address" it copied "debugger:///VM326", which is no helpful.

So to figure out what file contains the code, I had to search through the source code.