More profiler cleanup:

* Move autoloader up a little bit so the profiler classes can use it
* Make Profiler into a singleton so it's lazy-constructed, $wgProfiler is now a configuration array (used 'visible' in ProfilerSimpleText as an example of other globals we can move into this array). If $wgProfiler is set to an object, it'll use that for back-compat
* Maintenance: rather than setting up the profiler and then disabling it, just disable it from the start
* Kill $wgProfiling -> now that ProfilerStub overrides profileIn() and profileOut(), it's not needed
* dumpHTML needs some fixes still

RELEASE-NOTES

@@ -65,6 +65,8 @@ PHP if you have not done so prior to upgrading MediaWiki.
   math conversion after upgrading, obtain the Math extension from SVN or from
   http://www.mediawiki.org/wiki/Extension:Math and add to LocalSettings.php:
   require_once "$IP/extensions/Math/Math.php";
+* $wgProfiler is now a configuration array, see StartProfiler.sample for details
+* $wgProfiling has been removed
 
 === New features in 1.18 ===
 * (bug 8130) Query pages should limit to content namespaces, not just main

StartProfiler.sample

@@ -6,15 +6,13 @@ require_once( dirname(__FILE__).'/includes/ProfilerStub.php' );
  * To use a profiler, copy this file to StartProfiler.php,
  * delete the PHP line above, and add something like this:
  *
- *   require_once(  dirname(__FILE__).'/includes/Profiler.php' );
- *   $wgProfiler = new Profiler;
+ *   $wgProfiler['class'] = 'Profiler';
  *
  * Or for a sampling profiler:
  *   if ( !mt_rand( 0, 100 ) ) {
- *       require_once(  dirname(__FILE__).'/includes/Profiler.php' );
- *       $wgProfiler = new Profiler;
+ *       $wgProfiler['class'] = 'Profiler';
  *   } else {
- *       require_once(  dirname(__FILE__).'/includes/ProfilerStub.php' );
+ *       $wgProfiler['class'] = 'ProfilerStub';
  *   }
  * 
  * Configuration of the profiler output can be done in LocalSettings.php

includes/WebStart.php

@@ -89,19 +89,18 @@ if ( !defined( 'MW_COMPILED' ) ) {
 	# Get MWInit class
 	require_once( "$IP/includes/Init.php" );
 
+	# Start the autoloader, so that extensions can derive classes from core files
+	require_once( "$IP/includes/AutoLoader.php" );
+
 	# Start profiler
 	# FIXME: rewrite wfProfileIn/wfProfileOut so that they can work in compiled mode
+	require_once( "$IP/includes/profiler/Profiler.php" );
 	if ( file_exists( "$IP/StartProfiler.php" ) ) {
 		require_once( "$IP/StartProfiler.php" );
-	} else {
-		require_once( "$IP/includes/profiler/ProfilerStub.php" );
 	}
 
 	# Load up some global defines.
 	require_once( "$IP/includes/Defines.php" );
-
-	# Start the autoloader, so that extensions can derive classes from core files
-	require_once( "$IP/includes/AutoLoader.php" );
 }
 
 wfProfileIn( 'WebStart.php-conf' );

includes/profiler/Profiler.php

@@ -7,16 +7,21 @@
  * This file is only included if profiling is enabled
  */
 
-/** backward compatibility */
-$wgProfiling = true;
+/**
+ * Default profiling configuration. Permitted keys are:
+ *   class   : Name of Profiler or subclass to use for profiling
+ *   visible : Whether to output the profile info [ProfilerSimpleText only]
+ */
+$wgProfiler = array(
+	'class' => 'ProfilerStub',
+);
 
 /**
  * Begin profiling of a function
  * @param $functionname String: name of the function we will profile
  */
 function wfProfileIn( $functionname ) {
-	global $wgProfiler;
-	$wgProfiler->profileIn( $functionname );
+	Profiler::instance()->profileIn( $functionname );
 }
 
 /**
@@ -24,24 +29,21 @@ function wfProfileIn( $functionname ) {
  * @param $functionname String: name of the function we have profiled
  */
 function wfProfileOut( $functionname = 'missing' ) {
-	global $wgProfiler;
-	$wgProfiler->profileOut( $functionname );
+	Profiler::instance()->profileOut( $functionname );
 }
 
 /**
  * Returns a profiling output to be stored in debug file
  */
 function wfGetProfilingOutput() {
-	global $wgProfiler;
-	return $wgProfiler->getOutput();
+	Profiler::instance()->getOutput();
 }
 
 /**
  * Close opened profiling sections
  */
 function wfProfileClose() {
-	global $wgProfiler;
-	$wgProfiler->close();
+	Profiler::instance()->close();
 }
 
 if (!function_exists('memory_get_usage')) {
@@ -59,6 +61,7 @@ class Profiler {
 	var $mStack = array (), $mWorkStack = array (), $mCollated = array ();
 	var $mCalls = array (), $mTotals = array ();
 	var $mTemplated = false;
+	private static $__instance = null;
 
 	function __construct() {
 		// Push an entry for the pre-profile setup time onto the stack
@@ -71,14 +74,33 @@ class Profiler {
 		}
 	}
 
+	/**
+	 * Singleton
+	 * @return Profiler
+	 */
+	public static function instance() {
+		if( is_null( self::$__instance ) ) {
+			global $wgProfiler;
+			if( is_array( $wgProfiler ) ) {
+				$class = $wgProfiler['class'];
+				self::$__instance = new $class( $wgProfiler );
+			} elseif( $wgProfiler instanceof Profiler ) {
+				self::$__instance = $wgProfiler; // back-compat
+			} else {
+				throw new MWException( '$wgProfiler set to bogus value' );
+			}
+			
+		}
+		return self::$__instance;
+	}
+
 	/**
 	 * Called by wfProfieIn()
 	 *
 	 * @param $functionname String
 	 */
 	public function profileIn( $functionname ) {
-		global $wgDebugFunctionEntry, $wgProfiling;
-		if( !$wgProfiling ) return;
+		global $wgDebugFunctionEntry;
 		if( $wgDebugFunctionEntry ){
 			$this->debug( str_repeat( ' ', count( $this->mWorkStack ) ) . 'Entering ' . $functionname . "\n" );
 		}
@@ -92,8 +114,7 @@ class Profiler {
 	 * @param $functionname String
 	 */
 	public function profileOut($functionname) {
-		global $wgDebugFunctionEntry, $wgProfiling;
-		if( !$wgProfiling ) return;
+		global $wgDebugFunctionEntry;
 		$memory = memory_get_usage();
 		$time = $this->getTime();
 
@@ -128,12 +149,6 @@ class Profiler {
 	 * called by wfProfileClose()
 	 */
 	public function close() {
-		global $wgProfiling;
-
-		# Avoid infinite loop
-		if( !$wgProfiling )
-			return;
-
 		while( count( $this->mWorkStack ) ){
 			$this->profileOut( 'close' );
 		}

includes/profiler/ProfilerSimple.php

@@ -4,10 +4,6 @@
  * @ingroup Profiler
  */
 
-if ( !class_exists( 'Profiler' ) ) {
-	require_once( dirname( __FILE__ ) . '/Profiler.php' );
-}
-
 /**
  * Simple profiler base class.
  * @todo document methods (?)

includes/profiler/ProfilerSimpleText.php

@@ -4,18 +4,13 @@
  * @ingroup Profiler
  */
 
-if ( !class_exists( 'ProfilerSimple' ) ) {
-	require_once( dirname( __FILE__ ) . '/ProfilerSimple.php' );
-}
-
 /**
  * The least sophisticated profiler output class possible, view your source! :)
  *
- * Put the following 3 lines in StartProfiler.php:
+ * Put the following 2 lines in StartProfiler.php:
  *
- * require_once( dirname( __FILE__ ) . '/includes/ProfilerSimpleText.php' );
- * $wgProfiler = new ProfilerSimpleText;
- * $wgProfiler->visible=true;
+ * $wgProfiler['class'] = 'ProfilerSimpleText';
+ * $wgProfiler['visible'] = true;
  *
  * @ingroup Profiler
  */
@@ -23,6 +18,13 @@ class ProfilerSimpleText extends ProfilerSimple {
 	public $visible=false; /* Show as <PRE> or <!-- ? */
 	static private $out;
 
+	public function __construct( $profileConfig ) {
+		if( isset( $profileConfig['visible'] ) && $profileConfig['visible'] ) {
+			$this->visible = true;
+		}
+		parent::__construct();
+	}
+
 	function getFunctionReport() {
 		if($this->mTemplated) {
 			uasort($this->mCollated,array('self','sort'));

includes/profiler/ProfilerSimpleTrace.php

@@ -4,10 +4,6 @@
  * @ingroup Profiler
  */
 
-if ( !class_exists( 'ProfilerSimple' ) ) {
-	require_once( dirname( __FILE__ ) . '/ProfilerSimple.php' );
-}
-
 /**
  * Execution trace
  * @todo document methods (?)

includes/profiler/ProfilerSimpleUDP.php

@@ -4,10 +4,6 @@
  * @ingroup Profiler
  */
 
-if ( !class_exists( 'ProfilerSimple' ) ) {
-	require_once( dirname( __FILE__ ) . '/ProfilerSimple.php' );
-}
-
 /**
  * ProfilerSimpleUDP class, that sends out messages for 'udpprofile' daemon
  * (the one from mediawiki/trunk/udpprofile SVN )

includes/profiler/ProfilerStub.php

@@ -4,10 +4,6 @@
  * @file
  * @ingroup Profiler
  */
-if ( !class_exists( 'Profiler' ) ) {
-	require_once( dirname( __FILE__ ) . '/Profiler.php' );
-}
-
 class ProfilerStub extends Profiler {
 
 	/**
@@ -59,7 +55,3 @@ class ProfilerStub extends Profiler {
 	public function getOutput() {}
 	public function close() {}
 }
-
-/** backward compatibility */
-$wgProfiling = false;
-$wgProfiler = new ProfilerStub();

maintenance/Maintenance.php

@@ -803,7 +803,7 @@ abstract class Maintenance {
 	 */
 	public function finalSetup() {
 		global $wgCommandLineMode, $wgShowSQLErrors, $wgServer;
-		global $wgProfiling, $wgDBadminuser, $wgDBadminpassword;
+		global $wgDBadminuser, $wgDBadminpassword;
 		global $wgDBuser, $wgDBpassword, $wgDBservers, $wgLBFactoryConf;
 
 		# Turn off output buffering again, it might have been turned on in the settings files
@@ -848,8 +848,6 @@ abstract class Maintenance {
 		$wgShowSQLErrors = true;
 		@set_time_limit( 0 );
 		$this->adjustMemoryLimit();
-
-		$wgProfiling = false; // only for Profiler.php mode; avoids OOM errors
 	}
 
 	/**

maintenance/doMaintenance.php

@@ -69,13 +69,8 @@ if ( !defined( 'MW_COMPILED' ) ) {
 	require_once( "$IP/includes/Init.php" );
 }
 
-# Setup the profiler
-global $IP;
-if ( !defined( 'MW_COMPILED' ) && file_exists( "$IP/StartProfiler.php" ) ) {
-	require_once( "$IP/StartProfiler.php" );
-} else {
-	require_once( MWInit::compiledPath( 'includes/profiler/ProfilerStub.php' ) );
-}
+# Stub the profiler
+require_once( MWInit::compiledPath( 'includes/profiler/Profiler.php' ) );
 
 // Some other requires
 if ( !defined( 'MW_COMPILED' ) ) {