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[Pharo-project] FOSDEM2012 smalltalk devroom 5 feb, sprint 4 feb

by Stephan Eggermont

Feb 4-5 2012 Brussels hosts FOSDEM2012, the free and open software developers european meeting. Sunday there will be a smalltalk devroom (AW 1.126) with a number of interesting presentations. 09:30 Norbert Hartl, Take a small REST. Simple approaches for REST in smalltalk 10:00 Stephane Ducasse, Marcus Denker, The next steps for the Pharo Vision 11:00 Laurent Laffont, John Thornton, Amber, the Smalltalk for web developers 12:00 Nick Ager, An introduction to jQuery Mobile 12:30 Stefan Marr, RoarVM, Sly 13:00 David Chisnall, Compiling Smalltalk to fast native Code 13:30 Craig Latta, Spoon 14:00 Stephan Eggermont, Willem van den Ende, Diego Lont, Back to the future, (re)learn smalltalk (till 16:30). http://fosdem.org/2012/schedule/track/smalltalk_devroom As there is no devroom on saturday, the VUB has kindly offered to organise a sprint. There will be a room available at walking distance from FOSDEM. Stephan

Jan. 24, 2012

Re: [Pharo-project] Fwd: [squeak-dev] ANN: OpenGL + NativeBoost + Mac ==> success

by Fernando Olivero

Check out the most recent mail to this mailing list by Bert Freudenberg, were he explains the inner workings of the Ballon3D plugin, to achieve what you propose. The other means would be to change the VM, and bypass completely the bitmapped "Display", and provide Events+a windowed OpenGL context ,to were we can draw within the image. Check out recent emails from myself in the list,the thread titled "decoupling the vm: UI and interpretation". Fernando On Tue, Jan 24, 2012 at 3:04 AM, Lawson English <lenglish5(a)cox.net> wrote: > Kool. So how could I make the entire World a drawing surface so that I > could use the OpenGL drawing throughout the entire squeak/pharo OS > window, instead of within another window? > > Could a 2D/3D mashup like I have in this video be accomplished? The fps > is too slow to be useable for most things, at this point: > http://www.youtube.com/watch?v=nSLZKIXeXR4 > > On 1/23/12 3:00 PM, Hans-Martin Mosner wrote: >> Am 23.01.2012 18:03, schrieb Lawson English: >>> Is there a way to directly draw to the system window using OpenGL so that intermediate software blitting is eliminated? >>> >> The opengl context is already drawing directly to the screen (or rather, to the back buffer managed by opengl). >> There is no intermediate software blitting involved AFAIK. >> >> Cheers, >> Hans-Martin >> >> > >

Jan. 24, 2012

Re: [Pharo-project] [Vm-dev] Re: is there a way to avoid all the #tryNamedPrimitive:with: * in ProtoObject

by Mariano Martinez Peck

On Mon, Jan 23, 2012 at 10:22 PM, Eliot Miranda <eliot.miranda(a)gmail.com>wrote: > > > > On Mon, Jan 23, 2012 at 12:57 PM, StÃ©phane Ducasse < > stephane.ducasse(a)inria.fr> wrote: > >> Hi elliot >> >> What are these tryNamedPrimitive? >> > > The methods in ProtoObject implement invoking primitives in the context of > the debugger. > Ok, I was not that far :) > The debugger used to use methods in Object, tryPrimitive0, tryPrimitive1: > tryPrimitive2:with: et al, to invoke normal primitives. The debugger would > choose the tryPrimitive1: method with the right number of arguments, modify > its header to change its primitive number of the desired primitive, and > then call it to invoke the primitive. This is not reentrant. If one is > trying to debug the debugger then the tryPrimitive: method can be modified > by the debugger that is debugging the debugger that is in the process of > editing the tryPrimitive: method. To fix this, and eliminate the > tryPrimitiveN methods, someone introduced the tryPrimitive:withArgs: > primitive. (Note that in VisualWorks we solved this by creating a method > on the fly to invoke a given primitive and evaluating it using a primitive > that did the same thing as withArgs:executeMethod:). > Eliot, isn't that what I have suggested in my previous email? at least as I can understand, that was my idea. In fact, since even if we have this new primitive, we have to keep those methods because Pharo could be opened in older VMs, wouldn't it make sense such proposal? because that way we can remove those methods. So...if we are in latest cog, we use the primitive, otherwise, we generate the CM on the fly and we execute it. In both cases, we do not use these methods. > > Analogously, one needs a way of invoking named primitives in the debugger, > and using tryNamedPrimitive[:with:with:...] et al has exactly the same > weaknesses as tryPrimitiveN above. So introducing a primitive to run named > primitives is in keeping with tryPrimitive:withArgs:. Using the > VisualWorks approach is feasible but violates Occam's razor. > What what about temporally (to be removed in the future) just when we are using older VMs? > > Why do we need them in ProtoObject? >> > > Once tryNamedPrimitiveIn:for:withArgs: is implemented in all relevant > virtual machines we don't need them. You'll notice that there is no trace > of the tryPrimitiveN methods anymore, even though they're in Smalltalk-80. > > >> Because I'm not sure that adding primitive to VM is always a good >> solution. >> > > Agreed. But it is in keeping with the primitive for invoking numbered > primitives, tryPrimitive:withArgs:. > > > HTH > Eliot > > >> Stef >> >> > On Mon, Jan 23, 2012 at 8:52 AM, Mariano Martinez Peck < >> marianopeck(a)gmail.com> wrote: >> > Hi guys. I usually like to take a look to ProtoObject and see what is >> really needed for the minimal object. But having 30% of the methods being >> #tryNamedPrimitive:with: * is not fun. >> > So...I wonder, do you think there could be another way so that to avoid >> having all those methods in ProtoObject ? >> > >> > Yes there is. I implemented primitive 218 in Cog, >> primitiveDoNamedPrimitiveWithArgs, which is accessed via >> > >> > >> > tryNamedPrimitiveIn: aCompiledMethod for: aReceiver >> withArgs: arguments >> > | selector theMethod spec receiverClass | >> > <primitive: 218 error: ec> >> > ec ifNotNil: >> > ["If ec is an integer other than -1 there >> was a problem with primitive 218, >> > not with the external primitive itself. >> -1 indicates a generic failure (where >> > ec should be nil) but ec = nil means >> primitive 218 is not implemented. So >> > interpret -1 to mean the external >> primitive failed with a nil error code." >> > ec isInteger ifTrue: >> > [ec = -1 >> > ifTrue: [ec := nil] >> > ifFalse: [self >> primitiveFailed]]. >> > ^{PrimitiveFailToken. ec}]. >> > "Assume a nil error code implies the primitive is >> not implemented and fall back on the old code." >> > "Hack. Attempt to execute the named primitive >> from the given compiled method" >> > arguments size > 8 ifTrue: >> > [^{PrimitiveFailToken. nil}]. >> > selector := #( >> > tryNamedPrimitive >> > tryNamedPrimitive: >> > tryNamedPrimitive:with: >> > tryNamedPrimitive:with:with: >> > tryNamedPrimitive:with:with:with: >> > tryNamedPrimitive:with:with:with:with: >> > >> tryNamedPrimitive:with:with:with:with:with: >> > >> tryNamedPrimitive:with:with:with:with:with:with: >> > >> tryNamedPrimitive:with:with:with:with:with:with:with:) at: arguments size+1. >> > receiverClass := self objectClass: aReceiver. >> > theMethod := receiverClass lookupSelector: >> selector. >> > theMethod == nil ifTrue: >> > [^{PrimitiveFailToken. nil}]. >> > spec := theMethod literalAt: 1. >> > spec replaceFrom: 1 to: spec size with: >> (aCompiledMethod literalAt: 1) startingAt: 1. >> > Smalltalk unbindExternalPrimitives. >> > ^self object: aReceiver perform: selector >> withArguments: arguments inClass: receiverClass >> > >> > (cf tryPrimitive: withArgs:) and used in >> > >> > >> > doPrimitive: primitiveIndex method: meth receiver: >> receiver args: arguments >> > "Simulate a primitive method whose index is >> primitiveIndex. The simulated receiver >> > and arguments are given as arguments to this >> message. Any primitive which provokes >> > execution needs to be intercepted and simulated >> to avoid execution running away." >> > >> > | value | >> > "If successful, push result and return resuming >> context, else ^ { PrimitiveFailToken. errorCode }" >> > (primitiveIndex = 19) ifTrue: >> > [ToolSet >> > debugContext: self >> > label:'Code simulation error' >> > contents: nil]. >> > >> > "ContextPart>>blockCopy:; simulated to get >> startpc right" >> > (primitiveIndex = 80 and: [(self objectClass: >> receiver) includesBehavior: ContextPart]) >> > ifTrue: [^self push: ((BlockContext >> newForMethod: receiver method) >> > home: >> receiver home >> > startpc: >> pc + 2 >> > nargs: >> (arguments at: 1))]. >> > (primitiveIndex = 81 and: [(self objectClass: >> receiver) == BlockContext]) "BlockContext>>value[:value:...]" >> > ifTrue: [^receiver pushArgs: arguments >> from: self]. >> > (primitiveIndex = 82 and: [(self objectClass: >> receiver) == BlockContext]) "BlockContext>>valueWithArguments:" >> > ifTrue: [^receiver pushArgs: arguments >> first from: self]. >> > primitiveIndex = 83 "afr 9/11/1998 19:50" >> "Object>>perform:[with:...]" >> > ifTrue: [^self send: arguments first >> > to: receiver >> > with: arguments >> allButFirst >> > super: false]. >> > primitiveIndex = 84 "afr 9/11/1998 19:50 & eem >> 8/18/2009 17:04" "Object>>perform:withArguments:" >> > ifTrue: [^self send: arguments first >> > to: receiver >> > with: (arguments >> at: 2) >> > startClass: nil]. >> > primitiveIndex = 100 "eem 8/18/2009 16:57" >> "Object>>perform:withArguments:inSuperclass:" >> > ifTrue: [^self send: arguments first >> > to: receiver >> > with: (arguments >> at: 2) >> > startClass: >> (arguments at: 3)]. >> > >> > "Mutex>>primitiveEnterCriticalSection >> > >> Mutex>>primitiveTestAndSetOwnershipOfCriticalSection" >> > (primitiveIndex = 186 or: [primitiveIndex = 187]) >> ifTrue: >> > [| active effective | >> > active := Processor activeProcess. >> > effective := active effectiveProcess. >> > "active == effective" >> > value := primitiveIndex = 186 >> > ifTrue: [receiver >> primitiveEnterCriticalSectionOnBehalfOf: effective] >> > ifFalse: >> [receiver primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: >> effective]. >> > ^(value isArray >> > and: [value size = 2 >> > and: [value first == >> PrimitiveFailToken]]) >> > ifTrue: [value] >> > ifFalse: [self push: value]]. >> > >> > primitiveIndex = 188 ifTrue: "eem 5/27/2008 11:10 >> Object>>withArgs:executeMethod:" >> > [^MethodContext >> > sender: self >> > receiver: receiver >> > method: (arguments at: 2) >> > arguments: (arguments at: 1)]. >> > >> > "Closure primitives" >> > (primitiveIndex = 200 and: [self == receiver]) >> ifTrue: >> > "ContextPart>>closureCopy:copiedValues:; >> simulated to get startpc right" >> > [^self push: (BlockClosure >> > >> outerContext: receiver >> > startpc: >> pc + 2 >> > numArgs: >> arguments first >> > >> copiedValues: arguments last)]. >> > ((primitiveIndex between: 201 and: 205) >> "BlockClosure>>value[:value:...]" >> > or: [primitiveIndex between: 221 and: 222]) >> ifTrue: "BlockClosure>>valueNoContextSwitch[:]" >> > [^receiver simulateValueWithArguments: >> arguments caller: self]. >> > primitiveIndex = 206 ifTrue: >> "BlockClosure>>valueWithArguments:" >> > [^receiver simulateValueWithArguments: >> arguments first caller: self]. >> > >> > primitiveIndex = 118 ifTrue: >> "tryPrimitive:withArgs:; avoid recursing in the VM" >> > [(arguments size = 2 >> > and: [arguments first isInteger >> > and: [arguments last class == Array]]) >> ifFalse: >> > [^ContextPart >> primitiveFailTokenFor: nil]. >> > ^self doPrimitive: arguments first >> method: meth receiver: receiver args: arguments last]. >> > >> > value := primitiveIndex = 120 "FFI method" >> > ifTrue: [(meth literalAt: >> 1) tryInvokeWithArguments: arguments] >> > ifFalse: >> > [primitiveIndex = >> 117 "named primitives" >> > ifTrue: >> [self tryNamedPrimitiveIn: meth for: receiver withArgs: arguments] >> > ifFalse: >> > >> [receiver tryPrimitive: primitiveIndex withArgs: arguments]]. >> > ^(value isArray >> > and: [value size = 2 >> > and: [value first == PrimitiveFailToken]]) >> > ifTrue: [value] >> > ifFalse: [self push: value] >> > >> > (find attached). But these need implementing in the standard VM before >> they can be used in Pharo, Squeak, etc. >> > >> > >> > Thanks >> > >> > -- >> > Mariano >> > http://marianopeck.wordpress.com >> > >> > >> > >> > >> > -- >> > best, >> > Eliot >> > >> >> >> > > > -- > best, > Eliot > > > -- Mariano http://marianopeck.wordpress.com

Jan. 24, 2012

Re: [Pharo-project] is there a way to avoid all the #tryNamedPrimitive:with: * in ProtoObject

by StÃ©phane Ducasse

On Jan 23, 2012, at 10:22 PM, Eliot Miranda wrote: > > > On Mon, Jan 23, 2012 at 12:57 PM, StÃ©phane Ducasse <stephane.ducasse(a)inria.fr> wrote: > Hi elliot > > What are these tryNamedPrimitive? > > The methods in ProtoObject implement invoking primitives in the context of the debugger. The debugger used to use methods in Object, tryPrimitive0, tryPrimitive1: tryPrimitive2:with: et al, to invoke normal primitives. The debugger would choose the tryPrimitive1: method with the right number of arguments, modify its header to change its primitive number of the desired primitive, and then call it to invoke the primitive. This is not reentrant. If one is trying to debug the debugger then the tryPrimitive: method can be modified by the debugger that is debugging the debugger that is in the process of editing the tryPrimitive: method. To fix this, and eliminate the tryPrimitiveN methods, someone introduced the tryPrimitive:withArgs: primitive. (Note that in VisualWorks we solved this by creating a method on the fly to invoke a given primitive and evaluating it using a primitive that did the same thing as withArgs:executeMethod:). Thanks for the explanation. I have another question is this for invoking primitive directly? Or my question is why we cannot simply call the method that is flagged as a primitive? I started to read the interpreter of camillo and I did not arrive yet at primitives :) > Analogously, one needs a way of invoking named primitives in the debugger, and using tryNamedPrimitive[:with:with:...] et al has exactly the same weaknesses as tryPrimitiveN above. So introducing a primitive to run named primitives is in keeping with tryPrimitive:withArgs:. Using the VisualWorks approach is feasible but violates Occam's razor. You lost me. You mean that you want to avoid to have a primitive to execute primitives? > > Why do we need them in ProtoObject? > > Once tryNamedPrimitiveIn:for:withArgs: is implemented in all relevant virtual machines we don't need them. You'll notice that there is no trace of the tryPrimitiveN methods anymore, even though they're in Smalltalk-80. > > Because I'm not sure that adding primitive to VM is always a good solution. > > Agreed. But it is in keeping with the primitive for invoking numbered primitives, tryPrimitive:withArgs:. Yes I see. Thanks for the explanation. > > > HTH > Eliot > > > Stef > > > On Mon, Jan 23, 2012 at 8:52 AM, Mariano Martinez Peck <marianopeck(a)gmail.com> wrote: > > Hi guys. I usually like to take a look to ProtoObject and see what is really needed for the minimal object. But having 30% of the methods being #tryNamedPrimitive:with: * is not fun. > > So...I wonder, do you think there could be another way so that to avoid having all those methods in ProtoObject ? > > > > Yes there is. I implemented primitive 218 in Cog, primitiveDoNamedPrimitiveWithArgs, which is accessed via > > > > > > tryNamedPrimitiveIn: aCompiledMethod for: aReceiver withArgs: arguments > > | selector theMethod spec receiverClass | > > <primitive: 218 error: ec> > > ec ifNotNil: > > ["If ec is an integer other than -1 there was a problem with primitive 218, > > not with the external primitive itself. -1 indicates a generic failure (where > > ec should be nil) but ec = nil means primitive 218 is not implemented. So > > interpret -1 to mean the external primitive failed with a nil error code." > > ec isInteger ifTrue: > > [ec = -1 > > ifTrue: [ec := nil] > > ifFalse: [self primitiveFailed]]. > > ^{PrimitiveFailToken. ec}]. > > "Assume a nil error code implies the primitive is not implemented and fall back on the old code." > > "Hack. Attempt to execute the named primitive from the given compiled method" > > arguments size > 8 ifTrue: > > [^{PrimitiveFailToken. nil}]. > > selector := #( > > tryNamedPrimitive > > tryNamedPrimitive: > > tryNamedPrimitive:with: > > tryNamedPrimitive:with:with: > > tryNamedPrimitive:with:with:with: > > tryNamedPrimitive:with:with:with:with: > > tryNamedPrimitive:with:with:with:with:with: > > tryNamedPrimitive:with:with:with:with:with:with: > > tryNamedPrimitive:with:with:with:with:with:with:with:) at: arguments size+1. > > receiverClass := self objectClass: aReceiver. > > theMethod := receiverClass lookupSelector: selector. > > theMethod == nil ifTrue: > > [^{PrimitiveFailToken. nil}]. > > spec := theMethod literalAt: 1. > > spec replaceFrom: 1 to: spec size with: (aCompiledMethod literalAt: 1) startingAt: 1. > > Smalltalk unbindExternalPrimitives. > > ^self object: aReceiver perform: selector withArguments: arguments inClass: receiverClass > > > > (cf tryPrimitive: withArgs:) and used in > > > > > > doPrimitive: primitiveIndex method: meth receiver: receiver args: arguments > > "Simulate a primitive method whose index is primitiveIndex. The simulated receiver > > and arguments are given as arguments to this message. Any primitive which provokes > > execution needs to be intercepted and simulated to avoid execution running away." > > > > | value | > > "If successful, push result and return resuming context, else ^ { PrimitiveFailToken. errorCode }" > > (primitiveIndex = 19) ifTrue: > > [ToolSet > > debugContext: self > > label:'Code simulation error' > > contents: nil]. > > > > "ContextPart>>blockCopy:; simulated to get startpc right" > > (primitiveIndex = 80 and: [(self objectClass: receiver) includesBehavior: ContextPart]) > > ifTrue: [^self push: ((BlockContext newForMethod: receiver method) > > home: receiver home > > startpc: pc + 2 > > nargs: (arguments at: 1))]. > > (primitiveIndex = 81 and: [(self objectClass: receiver) == BlockContext]) "BlockContext>>value[:value:...]" > > ifTrue: [^receiver pushArgs: arguments from: self]. > > (primitiveIndex = 82 and: [(self objectClass: receiver) == BlockContext]) "BlockContext>>valueWithArguments:" > > ifTrue: [^receiver pushArgs: arguments first from: self]. > > primitiveIndex = 83 "afr 9/11/1998 19:50" "Object>>perform:[with:...]" > > ifTrue: [^self send: arguments first > > to: receiver > > with: arguments allButFirst > > super: false]. > > primitiveIndex = 84 "afr 9/11/1998 19:50 & eem 8/18/2009 17:04" "Object>>perform:withArguments:" > > ifTrue: [^self send: arguments first > > to: receiver > > with: (arguments at: 2) > > startClass: nil]. > > primitiveIndex = 100 "eem 8/18/2009 16:57" "Object>>perform:withArguments:inSuperclass:" > > ifTrue: [^self send: arguments first > > to: receiver > > with: (arguments at: 2) > > startClass: (arguments at: 3)]. > > > > "Mutex>>primitiveEnterCriticalSection > > Mutex>>primitiveTestAndSetOwnershipOfCriticalSection" > > (primitiveIndex = 186 or: [primitiveIndex = 187]) ifTrue: > > [| active effective | > > active := Processor activeProcess. > > effective := active effectiveProcess. > > "active == effective" > > value := primitiveIndex = 186 > > ifTrue: [receiver primitiveEnterCriticalSectionOnBehalfOf: effective] > > ifFalse: [receiver primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: effective]. > > ^(value isArray > > and: [value size = 2 > > and: [value first == PrimitiveFailToken]]) > > ifTrue: [value] > > ifFalse: [self push: value]]. > > > > primitiveIndex = 188 ifTrue: "eem 5/27/2008 11:10 Object>>withArgs:executeMethod:" > > [^MethodContext > > sender: self > > receiver: receiver > > method: (arguments at: 2) > > arguments: (arguments at: 1)]. > > > > "Closure primitives" > > (primitiveIndex = 200 and: [self == receiver]) ifTrue: > > "ContextPart>>closureCopy:copiedValues:; simulated to get startpc right" > > [^self push: (BlockClosure > > outerContext: receiver > > startpc: pc + 2 > > numArgs: arguments first > > copiedValues: arguments last)]. > > ((primitiveIndex between: 201 and: 205) "BlockClosure>>value[:value:...]" > > or: [primitiveIndex between: 221 and: 222]) ifTrue: "BlockClosure>>valueNoContextSwitch[:]" > > [^receiver simulateValueWithArguments: arguments caller: self]. > > primitiveIndex = 206 ifTrue: "BlockClosure>>valueWithArguments:" > > [^receiver simulateValueWithArguments: arguments first caller: self]. > > > > primitiveIndex = 118 ifTrue: "tryPrimitive:withArgs:; avoid recursing in the VM" > > [(arguments size = 2 > > and: [arguments first isInteger > > and: [arguments last class == Array]]) ifFalse: > > [^ContextPart primitiveFailTokenFor: nil]. > > ^self doPrimitive: arguments first method: meth receiver: receiver args: arguments last]. > > > > value := primitiveIndex = 120 "FFI method" > > ifTrue: [(meth literalAt: 1) tryInvokeWithArguments: arguments] > > ifFalse: > > [primitiveIndex = 117 "named primitives" > > ifTrue: [self tryNamedPrimitiveIn: meth for: receiver withArgs: arguments] > > ifFalse: > > [receiver tryPrimitive: primitiveIndex withArgs: arguments]]. > > ^(value isArray > > and: [value size = 2 > > and: [value first == PrimitiveFailToken]]) > > ifTrue: [value] > > ifFalse: [self push: value] > > > > (find attached). But these need implementing in the standard VM before they can be used in Pharo, Squeak, etc. > > > > > > Thanks > > > > -- > > Mariano > > http://marianopeck.wordpress.com > > > > > > > > > > -- > > best, > > Eliot > > > > > > > > -- > best, > Eliot >

Jan. 24, 2012

Re: [Pharo-project] Fwd: [squeak-dev] ANN: OpenGL + NativeBoost + Mac ==> success

by Lawson English

Kool. So how could I make the entire World a drawing surface so that I could use the OpenGL drawing throughout the entire squeak/pharo OS window, instead of within another window? Could a 2D/3D mashup like I have in this video be accomplished? The fps is too slow to be useable for most things, at this point: http://www.youtube.com/watch?v=nSLZKIXeXR4 On 1/23/12 3:00 PM, Hans-Martin Mosner wrote: > Am 23.01.2012 18:03, schrieb Lawson English: >> Is there a way to directly draw to the system window using OpenGL so that intermediate software blitting is eliminated? >> > The opengl context is already drawing directly to the screen (or rather, to the back buffer managed by opengl). > There is no intermediate software blitting involved AFAIK. > > Cheers, > Hans-Martin > >

Jan. 24, 2012

Re: [Pharo-project] Exception chapter PBE2

by Alexandre Bergel

Thanks Norbert. It has a long work we have done all together. Alexandre On 23 Jan 2012, at 18:54, Norbert Hartl wrote: > I've read the exception chapter of the new PBE. And I really enjoyed reading it. I find it easy to understand and well-balanced between how-to-use and how-it-works. Great work! > > Norbert > > P.S.: I thought I've found a typo where a message sentTo: is used. But then I discovered there is indeed a message called sentTo: Unfortunately I didn't get the difference to sendTo: :) -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

Jan. 24, 2012

[Pharo-project] Exception chapter PBE2

by Norbert Hartl

I've read the exception chapter of the new PBE. And I really enjoyed reading it. I find it easy to understand and well-balanced between how-to-use and how-it-works. Great work! Norbert P.S.: I thought I've found a typo where a message sentTo: is used. But then I discovered there is indeed a message called sentTo: Unfortunately I didn't get the difference to sendTo: :)

Jan. 23, 2012

Re: [Pharo-project] is there a way to avoid all the #tryNamedPrimitive:with: * in ProtoObject

by Eliot Miranda

On Mon, Jan 23, 2012 at 12:57 PM, StÃ©phane Ducasse < stephane.ducasse(a)inria.fr> wrote: > Hi elliot > > What are these tryNamedPrimitive? > The methods in ProtoObject implement invoking primitives in the context of the debugger. The debugger used to use methods in Object, tryPrimitive0, tryPrimitive1: tryPrimitive2:with: et al, to invoke normal primitives. The debugger would choose the tryPrimitive1: method with the right number of arguments, modify its header to change its primitive number of the desired primitive, and then call it to invoke the primitive. This is not reentrant. If one is trying to debug the debugger then the tryPrimitive: method can be modified by the debugger that is debugging the debugger that is in the process of editing the tryPrimitive: method. To fix this, and eliminate the tryPrimitiveN methods, someone introduced the tryPrimitive:withArgs: primitive. (Note that in VisualWorks we solved this by creating a method on the fly to invoke a given primitive and evaluating it using a primitive that did the same thing as withArgs:executeMethod:). Analogously, one needs a way of invoking named primitives in the debugger, and using tryNamedPrimitive[:with:with:...] et al has exactly the same weaknesses as tryPrimitiveN above. So introducing a primitive to run named primitives is in keeping with tryPrimitive:withArgs:. Using the VisualWorks approach is feasible but violates Occam's razor. Why do we need them in ProtoObject? > Once tryNamedPrimitiveIn:for:withArgs: is implemented in all relevant virtual machines we don't need them. You'll notice that there is no trace of the tryPrimitiveN methods anymore, even though they're in Smalltalk-80. > Because I'm not sure that adding primitive to VM is always a good solution. > Agreed. But it is in keeping with the primitive for invoking numbered primitives, tryPrimitive:withArgs:. HTH Eliot > Stef > > > On Mon, Jan 23, 2012 at 8:52 AM, Mariano Martinez Peck < > marianopeck(a)gmail.com> wrote: > > Hi guys. I usually like to take a look to ProtoObject and see what is > really needed for the minimal object. But having 30% of the methods being > #tryNamedPrimitive:with: * is not fun. > > So...I wonder, do you think there could be another way so that to avoid > having all those methods in ProtoObject ? > > > > Yes there is. I implemented primitive 218 in Cog, > primitiveDoNamedPrimitiveWithArgs, which is accessed via > > > > > > tryNamedPrimitiveIn: aCompiledMethod for: aReceiver > withArgs: arguments > > | selector theMethod spec receiverClass | > > <primitive: 218 error: ec> > > ec ifNotNil: > > ["If ec is an integer other than -1 there > was a problem with primitive 218, > > not with the external primitive itself. > -1 indicates a generic failure (where > > ec should be nil) but ec = nil means > primitive 218 is not implemented. So > > interpret -1 to mean the external > primitive failed with a nil error code." > > ec isInteger ifTrue: > > [ec = -1 > > ifTrue: [ec := nil] > > ifFalse: [self > primitiveFailed]]. > > ^{PrimitiveFailToken. ec}]. > > "Assume a nil error code implies the primitive is > not implemented and fall back on the old code." > > "Hack. Attempt to execute the named primitive from > the given compiled method" > > arguments size > 8 ifTrue: > > [^{PrimitiveFailToken. nil}]. > > selector := #( > > tryNamedPrimitive > > tryNamedPrimitive: > > tryNamedPrimitive:with: > > tryNamedPrimitive:with:with: > > tryNamedPrimitive:with:with:with: > > tryNamedPrimitive:with:with:with:with: > > tryNamedPrimitive:with:with:with:with:with: > > > tryNamedPrimitive:with:with:with:with:with:with: > > > tryNamedPrimitive:with:with:with:with:with:with:with:) at: arguments size+1. > > receiverClass := self objectClass: aReceiver. > > theMethod := receiverClass lookupSelector: > selector. > > theMethod == nil ifTrue: > > [^{PrimitiveFailToken. nil}]. > > spec := theMethod literalAt: 1. > > spec replaceFrom: 1 to: spec size with: > (aCompiledMethod literalAt: 1) startingAt: 1. > > Smalltalk unbindExternalPrimitives. > > ^self object: aReceiver perform: selector > withArguments: arguments inClass: receiverClass > > > > (cf tryPrimitive: withArgs:) and used in > > > > > > doPrimitive: primitiveIndex method: meth receiver: > receiver args: arguments > > "Simulate a primitive method whose index is > primitiveIndex. The simulated receiver > > and arguments are given as arguments to this > message. Any primitive which provokes > > execution needs to be intercepted and simulated > to avoid execution running away." > > > > | value | > > "If successful, push result and return resuming > context, else ^ { PrimitiveFailToken. errorCode }" > > (primitiveIndex = 19) ifTrue: > > [ToolSet > > debugContext: self > > label:'Code simulation error' > > contents: nil]. > > > > "ContextPart>>blockCopy:; simulated to get startpc > right" > > (primitiveIndex = 80 and: [(self objectClass: > receiver) includesBehavior: ContextPart]) > > ifTrue: [^self push: ((BlockContext > newForMethod: receiver method) > > home: > receiver home > > startpc: > pc + 2 > > nargs: > (arguments at: 1))]. > > (primitiveIndex = 81 and: [(self objectClass: > receiver) == BlockContext]) "BlockContext>>value[:value:...]" > > ifTrue: [^receiver pushArgs: arguments > from: self]. > > (primitiveIndex = 82 and: [(self objectClass: > receiver) == BlockContext]) "BlockContext>>valueWithArguments:" > > ifTrue: [^receiver pushArgs: arguments > first from: self]. > > primitiveIndex = 83 "afr 9/11/1998 19:50" > "Object>>perform:[with:...]" > > ifTrue: [^self send: arguments first > > to: receiver > > with: arguments > allButFirst > > super: false]. > > primitiveIndex = 84 "afr 9/11/1998 19:50 & eem > 8/18/2009 17:04" "Object>>perform:withArguments:" > > ifTrue: [^self send: arguments first > > to: receiver > > with: (arguments > at: 2) > > startClass: nil]. > > primitiveIndex = 100 "eem 8/18/2009 16:57" > "Object>>perform:withArguments:inSuperclass:" > > ifTrue: [^self send: arguments first > > to: receiver > > with: (arguments > at: 2) > > startClass: > (arguments at: 3)]. > > > > "Mutex>>primitiveEnterCriticalSection > > > Mutex>>primitiveTestAndSetOwnershipOfCriticalSection" > > (primitiveIndex = 186 or: [primitiveIndex = 187]) > ifTrue: > > [| active effective | > > active := Processor activeProcess. > > effective := active effectiveProcess. > > "active == effective" > > value := primitiveIndex = 186 > > ifTrue: [receiver > primitiveEnterCriticalSectionOnBehalfOf: effective] > > ifFalse: [receiver > primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: effective]. > > ^(value isArray > > and: [value size = 2 > > and: [value first == > PrimitiveFailToken]]) > > ifTrue: [value] > > ifFalse: [self push: value]]. > > > > primitiveIndex = 188 ifTrue: "eem 5/27/2008 11:10 > Object>>withArgs:executeMethod:" > > [^MethodContext > > sender: self > > receiver: receiver > > method: (arguments at: 2) > > arguments: (arguments at: 1)]. > > > > "Closure primitives" > > (primitiveIndex = 200 and: [self == receiver]) > ifTrue: > > "ContextPart>>closureCopy:copiedValues:; > simulated to get startpc right" > > [^self push: (BlockClosure > > > outerContext: receiver > > startpc: > pc + 2 > > numArgs: > arguments first > > > copiedValues: arguments last)]. > > ((primitiveIndex between: 201 and: 205) > "BlockClosure>>value[:value:...]" > > or: [primitiveIndex between: 221 and: 222]) > ifTrue: "BlockClosure>>valueNoContextSwitch[:]" > > [^receiver simulateValueWithArguments: > arguments caller: self]. > > primitiveIndex = 206 ifTrue: > "BlockClosure>>valueWithArguments:" > > [^receiver simulateValueWithArguments: > arguments first caller: self]. > > > > primitiveIndex = 118 ifTrue: > "tryPrimitive:withArgs:; avoid recursing in the VM" > > [(arguments size = 2 > > and: [arguments first isInteger > > and: [arguments last class == Array]]) > ifFalse: > > [^ContextPart > primitiveFailTokenFor: nil]. > > ^self doPrimitive: arguments first > method: meth receiver: receiver args: arguments last]. > > > > value := primitiveIndex = 120 "FFI method" > > ifTrue: [(meth literalAt: > 1) tryInvokeWithArguments: arguments] > > ifFalse: > > [primitiveIndex = > 117 "named primitives" > > ifTrue: > [self tryNamedPrimitiveIn: meth for: receiver withArgs: arguments] > > ifFalse: > > > [receiver tryPrimitive: primitiveIndex withArgs: arguments]]. > > ^(value isArray > > and: [value size = 2 > > and: [value first == PrimitiveFailToken]]) > > ifTrue: [value] > > ifFalse: [self push: value] > > > > (find attached). But these need implementing in the standard VM before > they can be used in Pharo, Squeak, etc. > > > > > > Thanks > > > > -- > > Mariano > > http://marianopeck.wordpress.com > > > > > > > > > > -- > > best, > > Eliot > > > > > -- best, Eliot

Jan. 23, 2012

Re: [Pharo-project] System Update auto Merge

by Camillo Bruni

On 2012-01-23, at 18:03, StÃ©phane Ducasse wrote: > > On Jan 23, 2012, at 5:39 PM, Camillo Bruni wrote: > >> Hi everyone, >> >> I wonder if it would make sense if System Update would perform auto merging? > > you mean instead of load? > You lost me somehow :) without interaction, I don't see the point of showing a merge UI for a system update when there is now merge conflict... >> >> I think if there are no merge conflicts you should not get any notifications from System Update. >> >> In any case I will program an Option for this in the Setting Browser. >> >> best >> cami > >

Jan. 23, 2012

Re: [Pharo-project] is there a way to avoid all the #tryNamedPrimitive:with: * in ProtoObject

by StÃ©phane Ducasse

Hi elliot What are these tryNamedPrimitive? Why do we need them in ProtoObject? Because I'm not sure that adding primitive to VM is always a good solution. Stef > On Mon, Jan 23, 2012 at 8:52 AM, Mariano Martinez Peck <marianopeck(a)gmail.com> wrote: > Hi guys. I usually like to take a look to ProtoObject and see what is really needed for the minimal object. But having 30% of the methods being #tryNamedPrimitive:with: * is not fun. > So...I wonder, do you think there could be another way so that to avoid having all those methods in ProtoObject ? > > Yes there is. I implemented primitive 218 in Cog, primitiveDoNamedPrimitiveWithArgs, which is accessed via > > > tryNamedPrimitiveIn: aCompiledMethod for: aReceiver withArgs: arguments > | selector theMethod spec receiverClass | > <primitive: 218 error: ec> > ec ifNotNil: > ["If ec is an integer other than -1 there was a problem with primitive 218, > not with the external primitive itself. -1 indicates a generic failure (where > ec should be nil) but ec = nil means primitive 218 is not implemented. So > interpret -1 to mean the external primitive failed with a nil error code." > ec isInteger ifTrue: > [ec = -1 > ifTrue: [ec := nil] > ifFalse: [self primitiveFailed]]. > ^{PrimitiveFailToken. ec}]. > "Assume a nil error code implies the primitive is not implemented and fall back on the old code." > "Hack. Attempt to execute the named primitive from the given compiled method" > arguments size > 8 ifTrue: > [^{PrimitiveFailToken. nil}]. > selector := #( > tryNamedPrimitive > tryNamedPrimitive: > tryNamedPrimitive:with: > tryNamedPrimitive:with:with: > tryNamedPrimitive:with:with:with: > tryNamedPrimitive:with:with:with:with: > tryNamedPrimitive:with:with:with:with:with: > tryNamedPrimitive:with:with:with:with:with:with: > tryNamedPrimitive:with:with:with:with:with:with:with:) at: arguments size+1. > receiverClass := self objectClass: aReceiver. > theMethod := receiverClass lookupSelector: selector. > theMethod == nil ifTrue: > [^{PrimitiveFailToken. nil}]. > spec := theMethod literalAt: 1. > spec replaceFrom: 1 to: spec size with: (aCompiledMethod literalAt: 1) startingAt: 1. > Smalltalk unbindExternalPrimitives. > ^self object: aReceiver perform: selector withArguments: arguments inClass: receiverClass > > (cf tryPrimitive: withArgs:) and used in > > > doPrimitive: primitiveIndex method: meth receiver: receiver args: arguments > "Simulate a primitive method whose index is primitiveIndex. The simulated receiver > and arguments are given as arguments to this message. Any primitive which provokes > execution needs to be intercepted and simulated to avoid execution running away." > > | value | > "If successful, push result and return resuming context, else ^ { PrimitiveFailToken. errorCode }" > (primitiveIndex = 19) ifTrue: > [ToolSet > debugContext: self > label:'Code simulation error' > contents: nil]. > > "ContextPart>>blockCopy:; simulated to get startpc right" > (primitiveIndex = 80 and: [(self objectClass: receiver) includesBehavior: ContextPart]) > ifTrue: [^self push: ((BlockContext newForMethod: receiver method) > home: receiver home > startpc: pc + 2 > nargs: (arguments at: 1))]. > (primitiveIndex = 81 and: [(self objectClass: receiver) == BlockContext]) "BlockContext>>value[:value:...]" > ifTrue: [^receiver pushArgs: arguments from: self]. > (primitiveIndex = 82 and: [(self objectClass: receiver) == BlockContext]) "BlockContext>>valueWithArguments:" > ifTrue: [^receiver pushArgs: arguments first from: self]. > primitiveIndex = 83 "afr 9/11/1998 19:50" "Object>>perform:[with:...]" > ifTrue: [^self send: arguments first > to: receiver > with: arguments allButFirst > super: false]. > primitiveIndex = 84 "afr 9/11/1998 19:50 & eem 8/18/2009 17:04" "Object>>perform:withArguments:" > ifTrue: [^self send: arguments first > to: receiver > with: (arguments at: 2) > startClass: nil]. > primitiveIndex = 100 "eem 8/18/2009 16:57" "Object>>perform:withArguments:inSuperclass:" > ifTrue: [^self send: arguments first > to: receiver > with: (arguments at: 2) > startClass: (arguments at: 3)]. > > "Mutex>>primitiveEnterCriticalSection > Mutex>>primitiveTestAndSetOwnershipOfCriticalSection" > (primitiveIndex = 186 or: [primitiveIndex = 187]) ifTrue: > [| active effective | > active := Processor activeProcess. > effective := active effectiveProcess. > "active == effective" > value := primitiveIndex = 186 > ifTrue: [receiver primitiveEnterCriticalSectionOnBehalfOf: effective] > ifFalse: [receiver primitiveTestAndSetOwnershipOfCriticalSectionOnBehalfOf: effective]. > ^(value isArray > and: [value size = 2 > and: [value first == PrimitiveFailToken]]) > ifTrue: [value] > ifFalse: [self push: value]]. > > primitiveIndex = 188 ifTrue: "eem 5/27/2008 11:10 Object>>withArgs:executeMethod:" > [^MethodContext > sender: self > receiver: receiver > method: (arguments at: 2) > arguments: (arguments at: 1)]. > > "Closure primitives" > (primitiveIndex = 200 and: [self == receiver]) ifTrue: > "ContextPart>>closureCopy:copiedValues:; simulated to get startpc right" > [^self push: (BlockClosure > outerContext: receiver > startpc: pc + 2 > numArgs: arguments first > copiedValues: arguments last)]. > ((primitiveIndex between: 201 and: 205) "BlockClosure>>value[:value:...]" > or: [primitiveIndex between: 221 and: 222]) ifTrue: "BlockClosure>>valueNoContextSwitch[:]" > [^receiver simulateValueWithArguments: arguments caller: self]. > primitiveIndex = 206 ifTrue: "BlockClosure>>valueWithArguments:" > [^receiver simulateValueWithArguments: arguments first caller: self]. > > primitiveIndex = 118 ifTrue: "tryPrimitive:withArgs:; avoid recursing in the VM" > [(arguments size = 2 > and: [arguments first isInteger > and: [arguments last class == Array]]) ifFalse: > [^ContextPart primitiveFailTokenFor: nil]. > ^self doPrimitive: arguments first method: meth receiver: receiver args: arguments last]. > > value := primitiveIndex = 120 "FFI method" > ifTrue: [(meth literalAt: 1) tryInvokeWithArguments: arguments] > ifFalse: > [primitiveIndex = 117 "named primitives" > ifTrue: [self tryNamedPrimitiveIn: meth for: receiver withArgs: arguments] > ifFalse: > [receiver tryPrimitive: primitiveIndex withArgs: arguments]]. > ^(value isArray > and: [value size = 2 > and: [value first == PrimitiveFailToken]]) > ifTrue: [value] > ifFalse: [self push: value] > > (find attached). But these need implementing in the standard VM before they can be used in Pharo, Squeak, etc. > > > Thanks > > -- > Mariano > http://marianopeck.wordpress.com > > > > > -- > best, > Eliot >

Jan. 23, 2012