[Vm-dev] BUG? A problem with callbacks that shows up in 64bits (but is on 32bits too)

[Nicolas Cellier]

Couldn't it be that some Smalltalk memory has been relocated? (I'm thinking
of the DisplayScreen bits)

2017-03-12 12:53 GMT+01:00 Esteban Lorenzano <estebanlm at gmail.com>:

>
> Hi,
>
> this is lockSurfaceFn:
>
> createLockSurfaceFn
> ^ FFICallback
> signature: #(void * (void *handle, int *pitch, int x, int y, int w, int h))
> block: [ :handle :pitch :x :y :w :h |
> pitch signedLongAt: 1 put: (self get_stride: handle).
> self get_data: handle ]
>
> and
>
> createUnlockSurfaceFn
> ^ FFICallback
> signature: #(int (void *handle, int x, int y, int w, int h))
> block: [ :handle :x :y :w :h | 0 "Do nothing” ]
>
> cheers!
> Esteban
>
> On 12 Mar 2017, at 03:34, Eliot Miranda <eliot.miranda at gmail.com> wrote:
>
> Hi Esteban,
>
> On Fri, Mar 10, 2017 at 7:35 AM, Esteban Lorenzano <estebanlm at gmail.com>
> wrote:
>
>>
>> Hi,
>>
>> I’m tumbling into an error in Pharo, because we use callbacks
>> intensively, in Athens(cairo)-to-World conversion in particular, and people
>> is sending always their crash reports… we made the whole conversion a lot
>> more robust since problems started to arise, but now I hit a wall I cannot
>> solve: I think problem is in something in callbacks.
>>
>
> My original theory is wrong.  As you suspected it is something to do with
> the callback in primitiveCopyBits via lockSurfaces & unlockSurfaces.  Can
> you tell me what the callback is and what code installs it into the
> lockSurfaceFn and unlockSurfaceFn?
>
>
>> And problem is showing very easy on 64bits (while in 32bits it takes time
>> and is more random).
>>
>> Here is the easiest way to reproduce it (in mac):
>>
>> wget files.pharo.org/get-files/60/pharo64-mac-latest.zip
>> wget files.pharo.org/get-files/60/pharo64.zip
>> wget files.pharo.org/get-files/60/sources.zip
>> unzip pharo64-mac-latest.zip
>> unzip pharo64.zip
>> unzip sources.zip
>> ./Pharo.app/Contents/MacOS/Pharo ./Pharo64-60438.image eval "VGTigerDemo
>> runDemo"
>>
>> eventually (like 5-6 seconds after, if not immediately), you will have a
>> stack like this:
>>
>> SmallInteger(Object)>>primitiveFailed:
>> SmallInteger(Object)>>primitiveFailed
>> SmallInteger(VMCallbackContext64)>>primSignal:andReturnAs:fromContext:
>> GrafPort>>copyBits
>> GrafPort>>image:at:sourceRect:rule:
>> FormCanvas>>image:at:sourceRect:rule:
>> FormCanvas(Canvas)>>drawImage:at:sourceRect:
>> FormCanvas(Canvas)>>drawImage:at:
>> VGTigerDemo>>runDemo
>> VGTigerDemo class>>runDemo
>> UndefinedObject>>DoIt
>> OpalCompiler>>evaluate
>> OpalCompiler(AbstractCompiler)>>evaluate:
>> [ result := Smalltalk compiler evaluate: aStream.
>> self hasSessionChanged
>>         ifFalse: [ self stdout
>>                         print: result;
>>                         lf ] ] in EvaluateCommandLineHandler>>evaluate:
>> in Block: [ result := Smalltalk compiler evaluate: aStream....
>> BlockClosure>>on:do:
>> EvaluateCommandLineHandler>>evaluate:
>> EvaluateCommandLineHandler>>evaluateArguments
>> EvaluateCommandLineHandler>>activate
>> EvaluateCommandLineHandler class(CommandLineHandler class)>>activateWith:
>> [ aCommandLinehandler activateWith: commandLine ] in
>> PharoCommandLineHandler(BasicCommandLineHandler)>>activateSubCommand: in
>> Block: [ aCommandLinehandler activateWith: commandLine ]
>> BlockClosure>>on:do:
>> PharoCommandLineHandler(BasicCommandLineHandler)>>activateSubCommand:
>> PharoCommandLineHandler(BasicCommandLineHandler)>>handleSubcommand
>> PharoCommandLineHandler(BasicCommandLineHandler)>>handleArgument:
>> [ self
>>         handleArgument:
>>                 (self arguments
>>                         ifEmpty: [ '' ]
>>                         ifNotEmpty: [ :arguments | arguments first ]) ]
>> in PharoCommandLineHandler(BasicCommandLineHandler)>>activate in Block:
>> [ self...
>> BlockClosure>>on:do:
>> PharoCommandLineHandler(BasicCommandLineHandler)>>activate
>> PharoCommandLineHandler>>activate
>> PharoCommandLineHandler class(CommandLineHandler class)>>activateWith:
>> [ super activateWith: aCommandLine ] in PharoCommandLineHandler
>> class>>activateWith: in Block: [ super activateWith: aCommandLine ]
>>
>> Any idea?
>>
>> thanks!
>> Esteban
>
>
>
>
> --
> _,,,^..^,,,_
> best, Eliot
>
>
>
>
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