Hi Guillermo, On Wed, Mar 14, 2012 at 12:48 PM, Guillermo Polito < [email protected]> wrote:
> Hi Eliot, > > do you have a pointer of where can I see the differences between the old > Squeak format and the cog image format, so I can make SystemTracer work on > Cog vms? > So the image format differences are - floats are in platform order, not necessarily in big-endian order - the layout of the specialObjectsArray is slightly different (documented in recreateSpecialObjectsArray) - there are more words in the header, see StackInterpreter>writeImageFileIO:, i.e. in Cog: self putLong: self imageFormatVersion toFile: f. self putLong: headerSize toFile: f. self putLong: imageBytes toFile: f. self putLong: objectMemory startOfMemory toFile: f. self putLong: objectMemory specialObjectsOop toFile: f. self putLong: objectMemory newObjectHash toFile: f. self putLong: self ioScreenSize toFile: f. self putLong: self getImageHeaderFlags toFile: f. self putLong: extraVMMemory toFile: f. self putShort: desiredNumStackPages toFile: f. self putShort: self unknownShortOrCodeSizeInKs toFile: f. self putLong: desiredEdenBytes toFile: f. self putShort: (maxExtSemTabSizeSet ifTrue: [self ioGetMaxExtSemTableSize] ifFalse: [0]) toFile: f. self putShort: 0 toFile: f. 1 to: 4 do: [:i | self putLong: 0 toFile: f]. "fill remaining header words with zeros" in Interpreter: self putLong: (self imageFormatVersion) toFile: f. self putLong: headerSize toFile: f. self putLong: imageBytes toFile: f. self putLong: (self startOfMemory) toFile: f. self putLong: specialObjectsOop toFile: f. self putLong: lastHash toFile: f. self putLong: (self ioScreenSize) toFile: f. self putLong: fullScreenFlag toFile: f. self putLong: extraVMMemory toFile: f. 1 to: 7 do: [:i | self putLong: 0 toFile: f]. "fill remaining header words with zeros" Then getImageHeaderFlags "Answer the flags that are contained in the 7th long of the image header." ^fullScreenFlag "0 or 1" + (VMBIGENDIAN ifTrue: [0] ifFalse: [2]) "this is the imageFloatsLittleEndian flag" + (processHasThreadId ifTrue: [4] ifFalse: [0]) + (flagInterpretedMethods ifTrue: [8] ifFalse: [0]) + (preemptionYields ifTrue: [0] ifFalse: [16]) + (noThreadingOfGUIThread ifTrue: [32] ifFalse: [0]) + (imageHeaderFlags bitAnd: 63 bitInvert32) "these are any flags we do not recognize" Now most of the information in the flags is accessible from vmParameterAt: (or some convenience methods). e.g. vm parameter 49 is the max external semaphore table size, and vm parameter 48 is the following flags: getCogVMFlags "Answer an array of flags indicating various properties of the Cog VM. Bit 0: implies the image's Process class has threadId as its 3rd inst var (zero relative) Bit 1: if set, methods that are interpreted will have the flag bit set in their header Bit 2: if set, implies preempting a process does not put it to the back of its run queue" ^objectMemory integerObjectOf: (processHasThreadId ifTrue: [1] ifFalse: [0]) + (flagInterpretedMethods ifTrue: [2] ifFalse: [0]) + (preemptionYields ifTrue: [0] ifFalse: [4]) + (noThreadingOfGUIThread ifTrue: [8] ifFalse: [0]) Read the comment for vmParameterAt: to get things like num stack pages and cog code size. Is this OK? I know it's a bit of a mess. If you or I (we?) write it up where should we put the info? > > Thanks, > Guille > > On Thu, Jan 27, 2011 at 6:36 PM, Levente Uzonyi <[email protected]> wrote: > >> On Thu, 27 Jan 2011, Benjamin wrote: >> >> It works for PharoCore-1.1-11196-UNSTABLE.1 but it seems to be the only >>> version where it works :S >>> >>> Does someone know why ? >>> >> >> It doesn't support Cog's image format. Try an image with the original >> Squeak format. You can convert your image with the latest SqueakVM. Only >> the unix VM was released with this feature yet, so you can use that >> http://squeakvm.org/unix/ or build a VM for your favorite platform. >> >> >> Levente >> >> >> >>> >>> Thanks, >>> >>> Ben >>> >>> On Jan 27, 2011, at 3:36 PM, Benjamin wrote: >>> >>> Hello guys, >>>> >>>> for one of my projects, I'm trying to use SystemTracer to create anew >>>> image, but it appears that it doesn't work on Pharo ... >>>> I can create a new image, but I can't open it. I've tried with an older >>>> VM (Squeak 3.8.18beta1U), but it's the same ... >>>> >>>> >>>> Did someone already have this problem ? Does someone have a solution ? >>>> >>>> >>>> >>>> Thanks in advance, >>>> >>>> Ben >>>> >>> >>> >>> >> > -- best, Eliot
