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Add performance warnings to Deprecated module.

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Adds a dedicated handler for performance warnings to be logged to
consoles if known performance-impacting methods are called.
Search service init is changed from a deprecation warning to a
performance warning for synchronous init.
This also re-enables the warning for the Basilisk & Co. search service
initialization which was previously removed in [a930a79]

See also the discussion on #916.
This commit is contained in:
wolfbeast 2018-12-24 05:06:54 +01:00 • committed by Roy Tam
commit 69919870c1
4 changed files with 60 additions and 7 deletions
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49
toolkit/modules/Deprecated.jsm
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@ -9,15 +9,21 @@ this.EXPORTED_SYMBOLS = [ "Deprecated" ];
const Cu = Components.utils;
const Ci = Components.interfaces;
const PREF_DEPRECATION_WARNINGS = "devtools.errorconsole.deprecation_warnings";
const PREF_PERFORMANCE_WARNINGS = "devtools.errorconsole.performance_warnings";
Cu.import("resource://gre/modules/Services.jsm");
// A flag that indicates whether deprecation warnings should be logged.
var logWarnings = Services.prefs.getBoolPref(PREF_DEPRECATION_WARNINGS);
var logDepWarnings = Services.prefs.getBoolPref(PREF_DEPRECATION_WARNINGS);
var logPerfWarnings = Services.prefs.getBoolPref(PREF_PERFORMANCE_WARNINGS);
Services.prefs.addObserver(PREF_DEPRECATION_WARNINGS,
function (aSubject, aTopic, aData) {
logWarnings = Services.prefs.getBoolPref(PREF_DEPRECATION_WARNINGS);
logDepWarnings = Services.prefs.getBoolPref(PREF_DEPRECATION_WARNINGS);
}, false);
Services.prefs.addObserver(PREF_PERFORMANCE_WARNINGS,
function (aSubject, aTopic, aData) {
logPerfWarnings = Services.prefs.getBoolPref(PREF_PERFORMANCE_WARNINGS);
}, false);
/**
@ -58,7 +64,7 @@ this.Deprecated = {
* logged.
*/
warning: function (aText, aUrl, aStack) {
if (!logWarnings) {
if (!logDepWarnings) {
return;
}
@ -71,7 +77,42 @@ this.Deprecated = {
let textMessage = "DEPRECATION WARNING: " + aText +
"\nYou may find more details about this deprecation at: " +
aUrl + "\n" +
aUrl + "\nCallstack:\n" +
// Append a callstack part to the deprecation message.
stringifyCallstack(aStack);
// Report deprecation warning.
Cu.reportError(textMessage);
},
/**
* Log a performance warning.
*
* @param string aText
* Performance issue warning text.
* @param string aUrl
* A URL pointing to documentation describing performance
* issue and the way to address it.
* @param nsIStackFrame aStack
* An optional callstack. If it is not provided a
* snapshot of the current JavaScript callstack will be
* logged.
*/
perfWarning: function (aText, aUrl, aStack) {
if (!logPerfWarnings) {
return;
}
// If URL is not provided, report an error.
if (!aUrl) {
Cu.reportError("Error in Deprecated.perfWarning: warnings must " +
"provide a URL documenting this performance issue.");
return;
}
let textMessage = "PERFORMANCE WARNING: " + aText +
"\nYou may find more details about this problem at: " +
aUrl + "\nCallstack:\n" +
// Append a callstack part to the deprecation message.
stringifyCallstack(aStack);