[sun-sparc-solaris2.6] crash in ObjectPointer_dispatchTo_arity_above_

[Lee Salzman]

Okay, I walked around with a debugger on a sparc. It seems that
map->dispatchID, while at a proper 8 byte boundary from the start of the
Map struct, is still offset 4 bytes (the GC's allocator only guarentees
4 byte word alignment), which pisses off sparcs. However, the sparc
version of GCC does not seem to have an option like -mno-strict-align to
compile this. A short term fix would be to edit your sources to use
memcpy() where it tries to copy the currentDispatchID into
map->dispatchID.

Lee

On Mon, Aug 09, 2004 at 04:49:13PM +0200, nicolas n pelletier wrote:
> Hello,
> 
> Compiling  the  latest vm.c,  vm.h  with the  lates  cvs  gave me  the
> following warning:
> 
> vm.c: In function `PSInterpreter_apply_to_arity_withOptionals_':
> vm.c:3021: warning: assignment from incompatible pointer type
> 
> I  am using  gcc-2.95.2.   Disregarding the  warning  and running  the
> generated vm led to a bus error in vm.c:2779.
> 
> I recompiled with debug information  to get more information about the
> crash, and include it here in the hope it will help.
> 
> -- 
> Nicolas
> 

> COPTFLAGS = -g -O0 -fomit-frame-pointer -DNDEBUG=1
> 
> (gdb) where
> #0  0x0001928c in ObjectPointer_dispatchTo_arity_above_ (name=265372, 
>     arguments=0xb0604, n=1, resendMethod=0) at vm.c:2779
> #1  0x00019d28 in PSInterpreter_send_to_through_arity_withOptionals_ (
>     i=0xb0624, selector=265372, args=0xb0604, dispatchers=0xb0604, n=1, 
>     opts=0x0) at vm.c:2979
> #2  0x0001fcd0 in PSInterpreter_sendMessage_withOptionals_ (i=0xb0624, n=1, 
>     opts=0x0) at vm.c:1012
> #3  0x0001a98c in PSInterpreter_interpret (i=0xb0624) at vm.c:3153
> #4  0x00013a4c in main (argc=2, argv=0xefffaf14)
>     at src/mobius/vm/platform/boot.c:95
> (gdb) print name
> $1 = 265372
> (gdb) print *arguments
> $2 = 236700
> (gdb) print n
> $3 = 1
> (gdb) print resendMethod
> $4 = 0
> (gdb) print map
> $5 = (struct Map *) 0xb8db4
> (gdb) print *map
> $6 = {header = {isMarked = 1, isForwarded = 0, idHash = 12220, objectSize = 8, 
>     objectFormat = 2}, map = 0xb8944, traits = 236900, representative = 236700, 
>   numDelegates = 7, numSlots = 1, slotTable = 0xb8de4, roleTable = 0xb8e14, 
>   dispatchID = 0, visitedPositions = 0}
> (gdb) print currentDispatchID
> $7 = 1
> (gdb) up
> #1  0x00019d28 in PSInterpreter_send_to_through_arity_withOptionals_ (
>     i=0xb0624, selector=265372, args=0xb0604, dispatchers=0xb0604, n=1, 
>     opts=0x0) at vm.c:2979
> (gdb) up
> #2  0x0001fcd0 in PSInterpreter_sendMessage_withOptionals_ (i=0xb0624, n=1, 
>     opts=0x0) at vm.c:1012
> (gdb) print *i
> $8 = {header = {isMarked = 1, isForwarded = 0, idHash = 11549, objectSize = 6, 
>     objectFormat = 2}, map = 0xb2580, traits = 237000, stack = 0xb05d4, 
>   method = 0x404e8, lexicalContext = 0x38b68, framePointer = 4, 
>   codePointer = 7, codeSize = 41808, stackPointer = 8, stackSize = 16}