[cfe-dev] [LLVMdev] Handling SRet on Windows x86

[Eric Christopher]

Hi Anton,

>From my perspective Win32 is the windows ABI and mingw and cygwin are their
own
ABIs especially as we're not targeting the MSVC abi, it's just the windows
abi?

-eric


On Wed, Mar 27, 2013 at 1:32 PM, Anton Korobeynikov <asl at math.spbu.ru>wrote:

> Hi Timur,
>
> I myself find the name "Win32" pretty confusing and easy to misuse
> (especially for someone who assumes that windows == msvc). After all
> mingw and cygwin is also win32. Maybe we should rename it into
> isTargetMSVC or something like this?
>
> On Wed, Mar 27, 2013 at 6:26 AM, Timur Iskhodzhanov <timurrrr at google.com>
> wrote:
> > Anton,
> >
> > What do you think?
> >
> > 2013/3/20 Eric Christopher <echristo at gmail.com>:
> >>
> >>
> >>
> >> On Wed, Mar 20, 2013 at 5:21 PM, Timur Iskhodzhanov <
> timurrrr at google.com>
> >> wrote:
> >>>
> >>> 2013/3/20 Timur Iskhodzhanov <timurrrr at google.com>:
> >>> > Anton,
> >>> >
> >>> > [+Eric, Nick,
> >>> > the e-mail thread context has been broken a few times, so you should
> >>> > probably look at the llvmdev archives.
> >>> > It all starts here:
> >>> > http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-October/053961.html]
> >>> >
> >>> > So I've decided to make a new attempt to fix this issue.
> >>> >
> >>> > We've discussed my patches with Eric and came up with the following
> >>> > idea:
> >>> > a) IsTargetWindows should be true for all the targets that execute on
> >>> > the Windows kernel, including Cygwin, MinGW and MSVC ABIs.
> >>> >
> >>> > However, "Windows 32-bit ABI" usually implies "MSVC 32-bit ABI", so
> >>> > it's Cygwin and MinGW (that are similar more similar to Itanium ABI
> >>> > than to MSVC ABI) that should be exceptions from the general Win32
> >>> > handling code.
> >>> >
> >>> > That is,
> >>> > b) We should add a IsTargetWin32 which is true if the MSVC 32-bit ABI
> >>> > is used and false for Cygwin+MinGW.
> >>> FTR, there's already such a method but it is (mis?)used only in
> >>> lib/Target/X86/X86FrameLowering.cpp for segmented stacks.
> >>> Are segmented stacks actually used with MSVC or is it just the
> >>> conditions there should use isTargetMingw() && !is64Bit() instead?
> >
> > Attached is a patch that makes the proposed change to isTargetWin32
> > and also fixes all the previous uses of isTargetWin32.
> > Can you please review it?
> >
> > --
> > Thanks,
> > Timur
> >
> >> cc'ing graydon about segmented stacks because I know rust uses them.
> >>
> >> -eric
> >>
> >
> > _______________________________________________
> > cfe-dev mailing list
> > cfe-dev at cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
> >
>
>
>
> --
> With best regards, Anton Korobeynikov
> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>
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