[Vm-dev] 64bits Pharo VM for windows
Eliot Miranda
eliot.miranda at gmail.com
Wed Mar 22 01:15:14 UTC 2017
Hi Nicolas,
> On Mar 21, 2017, at 5:14 PM, Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com> wrote:
>
> Now the failure is:
>
> gdb: unknown target exception 0xc0000028 at 0x76f38078
>
> Program received signal ?, Unknown signal.
> 0x0000000076f38078 in ntdll!RtlRaiseStatus () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
>
> (gdb) where
> #0 0x0000000076f38078 in ntdll!RtlRaiseStatus () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
> #1 0x0000000076ed7eb6 in ntdll!TpAlpcRegisterCompletionList () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
> #2 0x000007fefeb7e5a3 in msvcrt!longjmp () from /cygdrive/c/Windows/system32/msvcrt.dll
> #3 0x00000000004314f9 in returnToExecutivepostContextSwitch (inInterpreter=0, switchedContext=1)
> at ../../spur64src/vm/gcc3x-cointerp.c:22130
> #4 0x000000000043a110 in activateNewMethod () at ../../spur64src/vm/gcc3x-cointerp.c:15045
> #5 0x000000000043c6e2 in interpretMethodFromMachineCode () at ../../spur64src/vm/gcc3x-cointerp.c:19204
> #6 0x0000000000442e19 in ceSendsupertonumArgs (selector=204444792, superNormalBar=0, rcvr=206540520, numArgs=0)
> at ../../spur64src/vm/gcc3x-cointerp.c:17228
> #7 0x000000000b7000ba in ?? ()
> Backtrace stopped: previous frame inner to this frame (corrupt stack?)
>
> (gdb) up
> #1 0x0000000076ed7eb6 in ntdll!TpAlpcRegisterCompletionList () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
> (gdb) up
> #2 0x000007fefeb7e5a3 in msvcrt!longjmp () from /cygdrive/c/Windows/system32/msvcrt.dll
> (gdb) up
> #3 0x00000000004314f9 in returnToExecutivepostContextSwitch (inInterpreter=0, switchedContext=1)
> at ../../spur64src/vm/gcc3x-cointerp.c:22130
> 22130 siglongjmp(reenterInterpreter, ReturnToInterpreter);
>
> (gdb) call printCallStack()
> ... snip...
> 0xf0b138 I Set class(HashedCollection class)>new 0xc4f8ee8: a(n) Set class
> 0xf0b168 M FFICallbackThunk class>startUp: 0xdb6b718: a(n) FFICallbackThunk class
> 0xf0b1c0 M [] in SmalltalkImage>send:toClassesNamedIn:with: 0xc553d18: a(n) SmalltalkImage
> 0xf0b210 I OrderedCollection>do: 0xc8a81d8: a(n) OrderedCollection
> 0xf0b260 I SmalltalkImage>send:toClassesNamedIn:with: 0xc553d18: a(n) SmalltalkImage
> 0xf0b2b8 I SmalltalkImage>processStartUpList: 0xc553d18: a(n) SmalltalkImage
> 0xf0b310 I SmalltalkImage>snapshot:andQuit:withExitCode:embedded: 0xc553d18: a(n) SmalltalkImage
> 0xd1187b0 s SmalltalkImage>snapshot:andQuit:embedded:
> 0xc79ee20 s SmalltalkImage>snapshot:andQuit:
> 0xdc6c6b8 s TheWorldMenu>saveAndQuit
> 0xdc6eb20 s TheWorldMenu>doMenuItem:with:
> 0xdc6ef98 s [] in MenuItemMorph>invokeWithEvent:
> 0xdc6f200 s BlockClosure>ensure:
> 0xdc6f2b8 s CursorWithMask(Cursor)>showWhile:
> 0xdc6f370 s MenuItemMorph>invokeWithEvent:
> ...snip...
>
> (gdb) call longPrintOop(aMethodObj)
>
> 0x0d781f10: 70/112 d1/209 22/34 e0/224 7c/124 ba/186 31/49 86/134
> 0x0d781f18: fe/254
> 0xd781ed8: a(n) CompiledMethod (0x468=>0xc4f8168) format 0x1f nbytes 57 hdr8 ..... hash 0x0
> 0 0x29 5(0x5) nLits 5 nArgs 0 nTemps 0
> 1 0xc32c900 #initialize:
> 2 0xc2fa9a8 #basicNew
> 3 0x29 5(0x5)
> 4 0xc2f9478 #new
> 5 0xd759cf0 a(n) Association
>
> This indeed look like HashedCollection class>>new
> 49 <70> self
> 50 <D1> send: basicNew
> 51 <22> pushConstant: 5
> 52 <E0> send: initialize:
> 53 <7C> returnTop
>
> So that's the status of win64 cog currently...
> I'll stop here for tonight.
> Eliot, any clue what to look at?
Certainly look ok at the instruction that raised the exception. Looks like the longjmp is trying to return to somewhere it shouldn't. Also you've written "snip" at the hot end of the stack. If that's not a typo, post all of the hot end of the stack.
You could look at the returnToInterpreter jmpbuf after the setjmp that initializes it and become familiar with its contents. Then check when the longjmp occurs that it is t corrupted and the frame that created it still exists on the stack.
It may be that longjmp walks the stack (I hope not) looking for the frame containing the setjmp. As we can see from gdb's stack trace that can't be found. So finding out whether longjmp is simple or tries to be clever is important. Hopefully it is simple and just reloads the registers and jumps.
>
> 2017-03-22 0:47 GMT+01:00 Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com>:
>> Gah, stupid me, I didn't realized that the vm was compiled for SysV...
>> I need to define -DWIN64ABI somewhere...
>>
>> 2017-03-21 22:18 GMT+01:00 Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com>:
>>>
>>>
>>> 2017-03-21 7:48 GMT+01:00 Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com>:
>>>> Hi Eliot,
>>>> I'll try the assert if I can find a time slot today, otherwise this evening.
>>>> I could also have printed the jump_buf address in gdb, but it was too late yesterday ;)
>>>>
>>>>
>>>> 2017-03-21 2:19 GMT+01:00 Eliot Miranda <eliot.miranda at gmail.com>:
>>>>>
>>>>>
>>>>>
>>>>>> On Mon, Mar 20, 2017 at 6:01 PM, Eliot Miranda <eliot.miranda at gmail.com> wrote:
>>>>>> Hi Nicolas,
>>>>>>
>>>>>>> On Mon, Mar 20, 2017 at 5:56 PM, Eliot Miranda <eliot.miranda at gmail.com> wrote:
>>>>>>> Hi Nicolas,
>>>>>>>
>>>>>>>> On Mon, Mar 20, 2017 at 3:45 PM, Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com> wrote:
>>>>>>>>
>>>>>>>> Thanks Eliot for pushing WIN64 ABI further!
>>>>>>>>
>>>>>>>> So the failure is this one:
>>>>>>>>
>>>>>>>> gdb: unknown target exception 0xc0000028 at 0x774c8078
>>>>>>>>
>>>>>>>> Program received signal ?, Unknown signal.
>>>>>>>> 0x00000000774c8078 in ntdll!RtlRaiseStatus () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
>>>>>>>> (gdb) where
>>>>>>>> #0 0x00000000774c8078 in ntdll!RtlRaiseStatus () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
>>>>>>>> #1 0x0000000077467eb6 in ntdll!TpAlpcRegisterCompletionList () from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
>>>>>>>> #2 0x000007fefe08e5a3 in msvcrt!longjmp () from /cygdrive/c/Windows/system32/msvcrt.dll
>>>>>>>> #3 0x0000000000419502 in ceReturnToInterpreter (anOop=176164968) at ../../spur64src/vm/gcc3x-cointerp.c:16504
>>>>>>>> #4 0x000000000a801086 in ?? ()
>>>>>>>> Backtrace stopped: previous frame inner to this frame (corrupt stack?)
>>>>>>>>
>>>>>>>> I now suspect the jmp_buf alignment problem that I had to workaround in jpeg plugin:
>>>>>>>> It must be aligned on 16 bytes boundary in Win64, but sometimes the compiler fails to honour this requirement
>>>>>>>> See https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/120
>>>>>>>
>>>>>>> Hmph. So the stack /should/ be aligned on a 16-byte boundary and hence the compiler /should/ be able to maintain the invariant (see platforms/Cross/vm/sqCogStackAlignment.h; in fact on Mac OS X the alignment is 32 bytes).
>>>>>>>
>>>>>>> Let me suggest that you add the following to the preamble:
>>>>>>>
>>>>>>> #if WIN64
>>>>>>> # define sigsetjmp(jb,ssmf) (assert(((int)jb & 15) == 0, setjmp(jb))
>>>>>>> # define siglongjmp(jb,v) (assert(((int)jb & 15) == 0, longjmp(jb,v))
>>>>>>> #elif WIN32
>>>>>>> ...
>>>>>>>
>>>>>>> and make sure there's a self assertCStackWellAligned send in ceReturnToInterpreter.
>>>>>>
>>>>>> Hmmm. I expect we need code in the ceReturnToInterpreterTrampoline that establishes the stack alignment requirement. ceReturnToInterpreter: would be called from machine code where there is only 8 byte alignment on x64 (& 4 byte alignment on 32-bit VMs). If you like I can try and implement this tomorrow.
>>>>>
>>>>> Looking at the code, that's not necessary. The trampoline still switches to the C stack, which should be correctly aligned. So yes, definitely add the "self assertCStackWellAligned" to both ceReturnToInterpreter: and ceBaseFrameReturn:. It looks like the issue is whether the returnToInterpreter jmpbuf is correctly aligned.
>>>>>
>>>
>>>
>>> The STACK_ALIGN_BYTES is 16 in good agreement with WIN64 ABI and assertCStackWellAligned() do succeed in ceReturnToInterpreter...
>>>
>>> So, I added the assertion on setjmp and longjmp, but they do not fail.
>>> The jmp_buf reenterInterpreter is correctly aligned on 16 bytes boundary.
>>> There is a declaration like this in setjmp.h
>>> typedef _CRT_ALIGN(16) struct _SETJMP_FLOAT128
>>> So local and global jmp_buf variables are allways well aligned by the C compiler(s)
>>>
>>> The jpeg problem was caused by putting the jmp_buf into a structure.
>>> Apparently, gcc and clang fail to correctly handle that case
>>> (they should first align the whole struct on 16 bytes then align the offset of the jmp_buf member).
>>>
>>> There are other cases that will be problematic in Win64 exactly like the jpeg case, for example I see:
>>> siglongjmp((vmCallbackContext->trampoline)... in returnAsThroughCallbackContext
>>> longjmp(GIV(jmpBuf)[GIV(jmpDepth)]...in callbackLeave (only #if SQ_USE_GLOBAL_STRUCT)
>>>
>>> We should memcpy these to a local jmp_buf for WIN64 compatibility.
>>>
>>> But the VM failed before ever reaching one of these callbacks (we should have none in Squeak by default)
>>>
>>> So, wrong guess from my side for the moment, seeing longjmp on the call stack raised that false alarm.
>>>
>>>
>>>>>>
>>>>>>>> 2017-03-19 21:03 GMT+01:00 Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com>:
>>>>>>>>> And currently https://github.com/OpenSmalltalk/opensmalltalk-vm/blob/Cog/spur64src/vm/cogitX64.c is generated for SysV only.
>>>>>>>>> It's necessary to hack the CogX64Compiler SysV class var initialization and generate a win64 specific cogitX64.c.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> 2017-03-19 20:34 GMT+01:00 Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com>:
>>>>>>>>>> Hi Clement,
>>>>>>>>>> it's been a while since I last tested, but in a few words:
>>>>>>>>>> - win64 use it's own ABI
>>>>>>>>>> - we have to assign the registers differently than sysV
>>>>>>>>>> - the experiments I did resulted in VM crashing early (before opening window)
>>>>>>>>>>
>>>>>>>>>> Nicolas
>>>>>>>>>>
>>>>>>>>>> 2017-03-19 20:29 GMT+01:00 Clément Bera <bera.clement at gmail.com>:
>>>>>>>>>>>
>>>>>>>>>>> Thank you very much for doing Nicolas. It is very important for many Pharo users to use Pharo 64 bits on Windows.
>>>>>>>>>>>
>>>>>>>>>>> What are the problems you have when trying to build the VM with the JIT that you don't have when building the stack VM ? Is it about API to make the memory executable, is it about calling conventions ?
>>>>>>>>>>>
>>>>>>>>>>>> On Sun, Mar 19, 2017 at 12:14 PM, Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> And the appveyor builds are green
>>>>>>>>>>>> https://ci.appveyor.com/project/OpenSmalltalk/vm/build/1.0.579
>>>>>>>>>>>>
>>>>>>>>>>>> 2017-03-19 17:31 GMT+01:00 Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com>:
>>>>>>>>>>>>> Hi,
>>>>>>>>>>>>> I've built a 64bits pharo.stack.spur VM for windows on my machine,
>>>>>>>>>>>>> and I'm uploading the changes to opensmalltalk-vm in branch
>>>>>>>>>>>>> build_pharo_win32_with_cygwin
>>>>>>>>>>>>>
>>>>>>>>>>>>> If the appveyor job correctly succeed, I will emit a pull request.
>>>>>>>>>>>>>
>>>>>>>>>>>>> The VM does not have the SqueakSSL plugin yet.
>>>>>>>>>>>>>
>>>>>>>>>>>>> The 64bits squeak/pharo.cog.spur JIT for windows is still to come,
>>>>>>>>>>>>> but I did not work on it for a few months...
>>>>>>>>>>>>> One thing at a time.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Let's cross finger
>>>>>>>>>>>>>
>>>>>>>>>>>>> Nicolas
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> _,,,^..^,,,_
>>>>>>> best, Eliot
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> _,,,^..^,,,_
>>>>>> best, Eliot
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> _,,,^..^,,,_
>>>>> best, Eliot
>>>>>
>>>>
>>>
>>
>
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