Access violation

[Todd Fleming]

Today I moved my existing Slate repository elsewhere and fetched a new 
one to make sure everything was fresh.  Here's my entire session after 
the move:

todd at debian:~/$ mkdir slate
todd at debian:~/$ cd slate
todd at debian:~/slate$ darcs get http://slate.tunes.org/repos/main
todd at debian:~/slate$ cd main
todd at debian:~/slate/main$ make vm.h vm.c little.image AutoLoad
todd at debian:~/slate/main$ make vm
todd at debian:~/slate/main$ ./vm little.image
Slate 1> saveImageNamed: 'lin.image'.
Slate 2> ^D
todd at debian:~/slate/main$ ./vm lin.image
Slate 2> addSlot: #x valued: {4 5 6}.
Debug [0..1]: restart: 0.
Slate 3> addSlot: #x valued: {4. 5. 6}.
Segmentation fault

Todd


Brian Rice wrote:

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> This example doesn't give me a segmentation fault on Ubuntu Linux x86  
> (breezy badger) or OS X 10.4 on G5, even if I repeat it several times.
>
> I assume your VM is up to date (try deleting vm.c and vm.h and using  
> the "make" rule to force-get the stored VM sources as opposed to the  
> last-revisioned, even though the VM hasn't changed much in a while).  
> Were you using any non-standard compiler options (darcs whatsnew  
> common.mk for example might show some local modifications)?
>
> If the VM is absolutely stock, I'll need to find out why I can't  
> reproduce the issue; if someone else can try this, it'll help isolate  
> whether there's a platform issue or something else.
>
> However, I definitely need to finally fix the parse-state-carried- 
> forward bug before the next release. Perhaps in case of error we can  
> abort evaluation entirely. I'll look at this tomorrow when I have time.
>
> I also might re-enable the syntax "feature" where period-separators  
> are optional, since I really don't see what we're gaining without it.  
> But that's definitely a lower priority, even if it's easy.
>
> Thanks for the report, Todd.
>
> On Nov 24, 2005, at 5:19 PM, Todd Fleming wrote:
>
>> The following causes an access violation under both Linux and  
>> Windows.  My
>> darcs repository (main) is up to date. I fetched fresh copies of
>> vm.h, vm.c, little.image, and AutoLoad from alpha, built the VM,
>> loaded little.image, and saved it as {lin.image, win.image}.
>>
>> =======
>> todd at debian:~/slate$ ./vm lin.image
>> Slate: Growing heap to 6927208 bytes.
>> True
>> Slate 2> addSlot: #x valued: {4 5 6}.
>> The following condition was signaled:
>> Error: Line 1: Expected . or } but found Literal
>>
>> The following restarts are available:
>> 0) Abort evaluation of expression
>> 1) Quit Slate
>>
>> Enter 'help.' for instructions.
>> Debug [0..1]: The following condition was signaled from within the  
>> debugger:
>> Error: Line 1: Expected . or EndStream but found }
>> Debug [0..1]: Nil
>> Debug [0..1]: restart: 0.
>>
>> Slate 3> addSlot: #x valued: {4. 5. 6}.
>> Segmentation fault
>> =======
>>
>> The access violation occurs in PSObject_addSlotNamed_valued_.
>> obj points to invalid memory.
>>
>> Todd
>
>
> - --
> - -Brian
> http://tunes.org/~water/brice.vcf
>
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