1213427 - Investigate why browser_webconsole_output_04.js fails on Linux when invisibleToDebugger is true

Status: RESOLVED INVALID

(DevTools :: Console, defect)

Description

[J. Ryan Stinnett [:jryans] (Use needinfo, replies may be slow)]

While trying to land JSON viewer work in bug 1132203, `invisibleToDebugger` in Loader.jsm got set to true in the child process.  We'll likely be correcting this before finally landing bug 1132203.

In any case, when `invisibleToDebugger === true`, the test browser_webconsole_output_04.js fails on Linux:

115 INFO checkInput(8): document.styleSheets[0].cssRules
116 INFO Logging: document.styleSheets[0].cssRules
117 INFO Waiting for messages...
118 INFO TEST-PASS | devtools/client/webconsole/test/browser_webconsole_output_04.js | matched rule: console.log() output: CSSRuleList [ CSSStyleRule, CSSMediaRule ] - 
119 INFO Printing: document.styleSheets[0].cssRules
120 INFO Waiting for messages...
121 INFO TEST-PASS | devtools/client/webconsole/test/browser_webconsole_output_04.js | matched rule: print() output: [object CSSRuleList - 
122 INFO Evaluating: document.styleSheets[0].cssRules
123 INFO Waiting for messages...
124 INFO TEST-PASS | devtools/client/webconsole/test/browser_webconsole_output_04.js | matched rule: JS eval output: CSSRuleList [ CSSStyleRule, CSSMediaRule ] - 
125 INFO Clicking: document.styleSheets[0].cssRules
126 INFO TEST-PASS | devtools/client/webconsole/test/browser_webconsole_output_04.js | the message body - 
127 INFO message body tagName 'a' className 'cm-variable'
128 INFO Variables view opened: document.styleSheets[0].cssRules
129 INFO TEST-PASS | devtools/client/webconsole/test/browser_webconsole_output_04.js | variables view was shown - 
130 INFO checkInput(9): document.styleSheets[0].cssRules[0]
131 INFO Logging: document.styleSheets[0].cssRules[0]
132 INFO Waiting for messages...
JavaScript error: resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/devtools/server/actors/webconsole.js, line 446: TypeError: object in compartment marked as invisible to Debugger

This error comes from the following line:

  makeDebuggeeValue: function WCA_makeDebuggeeValue(aValue, aUseObjectGlobal)    
  {                                                                              
    let global = this.window;                                                    
    if (aUseObjectGlobal && typeof aValue == "object") {                         
      try {                                                                      
        global = Cu.getGlobalForObject(aValue);                                  
      }                                                                          
      catch (ex) {                                                               
        // The above can throw an exception if aValue is not an actual object.   
      }                                                                          
    }                                                                            
    let dbgGlobal = this.dbg.makeGlobalObjectReference(global);                  <------------
    return dbgGlobal.makeDebuggeeValue(aValue);                                  
  },

I believe the object is a CSSStyleRule at the time of the error.

This seems like either a bug in the test or in web console functionality, and it would be good to correct.

Comment 1

[Nicolas Chevobbe [:nchevobbe]]

Test was deleted during the old frontend test migration