mc semantics Begin forwarded message:

From: Andreas Raab <andreas.raab@gmx.de> Date: September 30, 2009 4:53:10 PM GMT+02:00 To: The general-purpose Squeak developers list <squeak-dev@lists.squeakfoundation.org

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Subject: [squeak-dev] Re: The Trunk: Monticello-ar.323.mcz Reply-To: The general-purpose Squeak developers list <squeak-dev@lists.squeakfoundation.org

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Miguel Enrique Cobá Martinez wrote:

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El mié, 30-09-2009 a las 04:39 +0000, commits@source.squeak.org escribió:

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Andreas Raab uploaded a new version of Monticello to project The Trunk: http://source.squeak.org/trunk/Monticello-ar.323.mcz Doesn't Monticello has its master repository on the wiresong site?

It does, but this is an interim experiment with the only purpose of trying to improve our local situation a little. Plus I have no commit rights to the upstream repository. Plus I need that now ;-)

There is always an interesting tension between upstream and downstream usage and we haven't really found out how to realistically deal with that tension in a sustained manner. If anyone has ideas, I'm all ears.

Cheers, - Andreas

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==================== Summary ====================

Name: Monticello-ar.323 Author: ar Time: 29 September 2009, 9:38:50 am UUID: 927bef84-8215-0443-afe4-c8575b3a300c Ancestors: Monticello-cwp.322

A small improvement to MC loading. New rules are: - Pass 1: Load class changes first - Pass 2: Compile new / changed methods - Pass 3: Install new / changed methods - Pass 4: Remove old methods This should provide a bit more stability to the loading process.

=============== Diff against Monticello-cwp.322 ===============

Item was added: + ----- Method: MCMethodDefinition>>asMethodAddition (in category 'accessing') ----- + asMethodAddition + ^MethodAddition new + compile: source + classified: category + withStamp: timeStamp + notifying: (SyntaxError new category: category) + logSource: true + inClass: self actualClass.!

Item was changed: ----- Method: MCPackageLoader>>basicLoad (in category 'private') ----- basicLoad errorDefinitions := OrderedCollection new. + [["Pass 1: Load everything but the methods, which are collected in methodAdditions." + additions do: [:ea | + [ea isMethodDefinition + ifTrue: [methodAdditions add: ea asMethodAddition] + ifFalse:[ea load]]on: Error do: [errorDefinitions add: ea]. + ] displayingProgress: 'Reshaping classes...'. + + "Pass 2: We compile new / changed methods" + methodAdditions do:[:ea| ea createCompiledMethod] displayingProgress: 'Compiling...'. - [[ - - "FIXME. Do a separate pass on loading class definitions as the very first thing. - This is a workaround for a problem with the so-called 'atomic' loading (you wish!!) - which isn't atomic at all but mixes compilation of methods with reshapes of classes. - - Since the method is not installed until later, any class reshape in the middle *will* - affect methods in subclasses that have been compiled before. There is probably - a better way of dealing with this by ensuring that the sort order of the definition lists - superclass definitions before methods for subclasses but I need this NOW, and adding - an extra pass ensures that methods are compiled against their new class definitions." + "Pass 3: Install the new / changed methods + (this is a separate pass to allow compiler changes to be loaded)" + methodAdditions do:[:ea| ea installMethod] displayingProgress: 'Installing...'. + + "Pass 4: Remove the obsolete methods" + removals do:[:ea| ea unload] displayingProgress: 'Cleaning up ...'. + + "Try again any delayed definitions" - additions do: [:ea | self loadClassDefinition: ea] displayingProgress: 'Loading classes...'. - - additions do: [:ea | self tryToLoad: ea] displayingProgress: 'Compiling methods...'. - removals do: [:ea | ea unload] displayingProgress: 'Cleaning up...'. self shouldWarnAboutErrors ifTrue: [self warnAboutErrors]. + errorDefinitions do: [:ea | ea load] displayingProgress: 'Reloading...'. + + "Finally, notify observers for the method additions" - errorDefinitions do: [:ea | ea addMethodAdditionTo: methodAdditions] displayingProgress: 'Reloading...'. - methodAdditions do: [:each | each installMethod]. methodAdditions do: [:each | each notifyObservers]. + + additions do: [:ea | ea postloadOver: (self obsoletionFor: ea)] displayingProgress: 'Initializing...' + ] on: InMidstOfFileinNotification do: [:n | n resume: true] + ] ensure: [self flushChangesFile]! - additions do: [:ea | ea postloadOver: (self obsoletionFor: ea)] displayingProgress: 'Initializing...'] - on: InMidstOfFileinNotification - do: [:n | n resume: true]] - ensure: [self flushChangesFile]!