[swift-dev] swift (ABI) and Windows

[Saleem Abdulrasool]

On Sat, May 7, 2016 at 7:55 PM, Sangjin Han <tinysun.net at gmail.com> wrote:

> One more,
>
> I couldn't build the libswiftCore.dll which can be used for Hello.swift.
> At least one symbol _TMSS is not dllexported.
> (But I could build the dll with dlltool.exe which make all symbols to be
> dllexported)
>
> To find out the reason, I built a Swift.ll instead of the Swift.obj for
> the libswiftCore.dll. The Swift.ll are built from many
> stdlib/public/core/*.swift and core/8/*.swift files, and about 50MB.
>
> In that file, I could find many dllexport symbols, like
> @_TZvOs7Process5_argcVs5Int32 = dllexport global %Vs5Int32
> zeroinitializer, align 4
> and Hello.ll uses them,
> @_TZvOs7Process5_argcVs5Int32 = external dllimport global %Vs5Int32, align
> 4
>
> In the case of _TMSS, Hello.ll uses the same way,
> @_TMSS = external dllimport global %swift.type, align 8
> But, Swift.ll did not declared with dllexport.
> @_TMSS = alias %swift.type, bitcast (i64* getelementptr inbounds (<{ i8**,
> i64, i64, %swift.type*, i64 }>, <{ i8**, i64, i64, %swift.type*, i64 }>*
> @_TMfSS, i32 0, i32 1) to %swift.type*)
>
> How we can make @_TMSS also has the dllexport?  Or any other solution ?
>

Interesting.  Does changing the string type from struct to class help?  Ill
try to have a look at this.


>
> -Han Sangjin
>
>
>
>
> 2016-05-08 8:01 GMT+09:00 Sangjin Han <tinysun.net at gmail.com>:
>
>> Hi all,
>>
>> I merged Saleem's #2080 to my working branch, and did some experiment.
>>
>> I could compile easily Hello.swift with #2080 merged one.
>>
>>   swiftc -c -o Hello.obj Hello.swift
>>   clang -o Hello.exe Hello.obj -llibswiftCore -llibswiftSwiftOnoneSupport
>> -Wl,<some link options>
>>
>> Without #2080, I should use the *.ll-modifying-trick. It is perfect in
>> this example.
>>
>> But, we need the way to disable dllimport. The immediate mode did not
>> work.
>>
>>   swift Hello.swift
>>   LLVM ERROR: Program used external function
>> '__imp_globalinit_33_1BDF70FFC18749BAB495A73B459ED2F0_func3' which could
>> not be resolved!
>>
>>   swift -O Hello.swift
>>   LLVM ERROR: Program used external function
>> '__imp__swift_getExistentialTypeMetadata' which could not be resolved!
>>
>> It seems swift.exe call directly the function in the DLL without import
>> library.
>>
>> The feature also needed when we link to static library.
>>
>> I don't know about the SIL, IR, so it is thankful someone tell me how to
>> approach this problem.
>>
>>
>> 2016-05-07 5:01 GMT+09:00 Saleem Abdulrasool <compnerd at compnerd.org>:
>>
>>> On Thu, May 5, 2016 at 5:26 PM, Joe Groff via swift-dev <
>>> swift-dev at swift.org> wrote:
>>>
>>>>
>>>> > On May 5, 2016, at 4:18 PM, Sangjin Han via swift-dev <
>>>> swift-dev at swift.org> wrote:
>>>> >
>>>> > Hi,
>>>> >
>>>> > I made an experimental MSVC port. Of cause, dllimport/dllexport and
>>>> the driver for linking and many other part is not implemented. But dynamic
>>>> linking was possible with some trick.
>>>> >
>>>> > I think it is useful for designing, my observation about the
>>>> experimental building of libswiftCore.dll, libswiftSwiftOnoneSupport.dll
>>>> and linking of Hello.exe - its source has only 'print("Hello")'.
>>>> >
>>>> > 1) SWIFT_RUNTIME_EXPORT was not enough for dllexport.
>>>> >   Hello.obj needed defined in libswift*.dll
>>>> >     _swift_getExistentialTypeMetadata,
>>>> >     _TFs5printFTGSaP__9separatorSS10terminatorSS_T_,
>>>> >     _TMSS,
>>>> >     _TZvOs7Process5_argcVs5Int32,
>>>> >     swift_bufferAllocate, ....
>>>> >   Some of above are dllexported by the macro, but _T* are not. Maybe,
>>>> it generated by swiftc.exe.
>>>> >   I used the utility 'dlltool.exe' from Cygwin/MinGW world. It
>>>> extracts all symbols and generates 'allsymbol.def'.
>>>> >   With that .def, I could build the all-symbol-dllexported
>>>> libswiftCore.dll.
>>>> >   (I'm hoping we can build it without this trick.)
>>>>
>>>> The _T symbols are emitted by the Swift compiler. You should modify
>>>> swiftc's IRGen to generate public symbols with LLVM's "dllexport" storage
>>>> class when targeting Windows.
>>>
>>>
>>> https://github.com/apple/swift/pull/2080 is a first cut attempt to do
>>> this.
>>>
>>>
>>>>
>>>> -Joe
>>>> _______________________________________________
>>>> swift-dev mailing list
>>>> swift-dev at swift.org
>>>> https://lists.swift.org/mailman/listinfo/swift-dev
>>>>
>>>
>>>
>>>
>>> --
>>> Saleem Abdulrasool
>>> compnerd (at) compnerd (dot) org
>>>
>>
>>
>


-- 
Saleem Abdulrasool
compnerd (at) compnerd (dot) org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-dev/attachments/20160509/9bd1b201/attachment.html>