[LLVMdev] Crashes on Windows 8 with >4k stack frames

[Nicholas Chapman]

Hi,
Please see this bug report that I filed:
https://llvm.org/bugs/show_bug.cgi?id=23368

To quote myself:
"I think the fix went in after the 3.6 branch.  I'll close this bug 
report and reopen if I hit it on trunk."

Thanks,
     Nick

On 30/06/2015 12:12, Ephrim Khong wrote:
> We tested on 3.4.2 and 3.5.1.  Later versions are slightly problematic 
> to test since they don't compile with VS2010.  Do you happen to know 
> if it's fixed in one of the released versions, or if there is a 
> workaround (chkstk?) or a bug report online?
>
> Thanks!
> Eph
>
> On 30.06.2015 12:58, Nicholas Chapman wrote:
>> It's a known issue.  I believe it's fixed in trunk however.
>> What LLVM version are you using?
>>
>>      Nick
>>
>> On 30/06/2015 10:21, Ephrim Khong wrote:
>>> Hi All,
>>>
>>> we have an issue with our LLVM-based JIT compiler - executing the
>>> compiled code corrupts memory (and subsequently crashes) if we alloca
>>> more than 4k of variables (more than 511 8-byte ints). The same code
>>> works on Windows 7 (32 and 64 bit), Linux, MacOS. We compile LLVM and
>>> our program with Microsoft's Visual Studio 2010. Both debug and
>>> release builds are affected.
>>>
>>> The variables are created en-block at the beginning of the function
>>> with code looking like
>>>
>>> for (i=0; i<513; ++i) {
>>>   AllocaInst *variable =
>>>        mBuilder.CreateAlloca(Type::getInt64Ty(mContext),0,"");
>>>   mBuilder.CreateStore(GetConstI("INT4_8",0),variable);
>>> }
>>>
>>> We have not yet looked at the compiled machine code (same on Win 7 and
>>> 8, or differs?). But the 4k limit made us suspicious, as there were
>>> some bug reports - some still open - regarding this limit with LLVM
>>> [1,2].
>>>
>>> So the question is - before digging into this for more days - is there
>>> some known issue with this, or does anyone have an idea what might go
>>> wrong?
>>>
>>> Thanks,
>>> Eph
>>>
>>> [1] https://llvm.org/bugs/show_bug.cgi?id=2921
>>> [2] https://llvm.org/bugs/show_bug.cgi?id=8919
>>>
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>>
>