Closed Bug 1211514 Opened 9 years ago Closed 4 years ago

Debugger often doesn't show non-external sources

Categories

(DevTools :: Debugger, defect, P3)

Product:
DevTools
Component:
Debugger
Type:
defect

Tracking

(firefox44 affected, firefox48 affected)

Status:
RESOLVED WONTFIX
Tracking Flags:
Tracking Status
firefox44 --- affected
firefox48 --- affected

People

(Reporter: arni2033, Unassigned)

References

(Blocks 1 open bug,
URL
)

Details

(Whiteboard: [devtools-platform]) 

STR:   (Win7_64, Nightly 44, 32bit, ID 20151004030211, new profile, safe mode)
1. Open the following "data:" url in a new tab or Ctrl+Shift+Click URL in the form above
>   data:text/html,<body onclick="alert()">
2. Open Debugger on in tab from Step 1 by pressing Ctrl+Shift+S
3. Click Inspector tab
4. Click Debugger tab again

Result:       Debugger displays no sources after Step 2. It displays them after Step 4.
Expectations: Debugger should always display all sources on the page

Please change the title if it's needed.
Note that if you click on the <body>, then the source does show up.

I suspect the onclick attribute is lazily compiled to a script and so SpiderMonkey (and hence the Debugger API) doesn't know about it until it is actually triggered.
Whiteboard: [dupeme] → [dupeme][devtools-platform]
Has STR: --- → yes
Summary: Debugger doesn't show sources on page <body onclick="alert()"> if devtools are opened by Ctrl+S → Debugger doesn't show sources on page <body onclick="alert()"> if devtools are opened by Ctrl+Shift+S
I encountered this in more cases. Here're 3 cases: A, B, C.

STR_2:
0. Open Debugger by Ctrl+Shift+S, close devtools.
1. Open:
 A) data:text/html,<body onclick="alert()">
 B) attachment 8724506 [details]
 C) data:text/html,<script src="data:text/javascript,onclick=function(){window;}"></script>
2. Repeat 10 times: Open devtools (F12), wait until debugger finishes loading, close devtools (F12)

In each case debugger breaks after several times I close/reopen devtools.
Several is "1 or more". "Debugger breaks" means that it doesn't show any sources from some point.
Conclusion: debugger is unreliable.
status-firefox48: --- → affected
Summary: Debugger doesn't show sources on page <body onclick="alert()"> if devtools are opened by Ctrl+Shift+S → Debugger often doesn't show non-external sources
Whiteboard: [dupeme][devtools-platform] → [devtools-platform]
Product: Firefox → DevTools

This issue still exists!

Priority: -- → P3

The onclick is lazy-compiled, so it won't be known to the debugger until you click the first time. I don't know that there's a way for us to address this. Also, we've started treating event handlers as "eval-like" so they have no URL, meaning that this issue is now only visible if you had a string event handler that happened to be using //# sourceURL= which is super unlikely.

I think I'll call this working as expected.

Status: NEW → RESOLVED
Closed: 4 years ago
Resolution: --- → WONTFIX
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