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From Damjan Jovanovic <dam...@apache.org>
Subject Re: Win64 progress at almost 50%; the challenging Win64<->UNO bridge looms
Date Thu, 06 Dec 2018 06:40:25 GMT
The main/bridges module has been ported to gbuild.

It consists of 3 deliverables, java_uno.jar and its JNI code in a java_uno
C++ library which comprise the Java<->UNO bridge, and then an <ABI>_cppu
library (eg. msci_cppu, gcc3_cppu) which comprises the C++<-> UNO bridge.
Blissfully, there are no header files delivered to solver, all are used
internally within main/bridges only.

We only care about the C++<->UNO bridge at this stage; Java isn't used
during AOO startup and any problems in it can be fixed later.

The source for this C++ bridge is in main/bridges/source/cpp_uno.
main/bridges/source/cpp_uno/shared
is code shared across all platforms, while:
main/bridges/source/cpp_uno/<ABI>-<OS>-<CPU>
is the platform-specific code.

The shared code is 9 files and 1562 lines in total, and exports 3 functions:
SAL_DLLPUBLIC_EXPORT sal_Bool SAL_CALL component_canUnload(TimeValue *
pTime) SAL_THROW_EXTERN_C;
SAL_DLLPUBLIC_EXPORT void SAL_CALL uno_initEnvironment(uno_Environment *
pCppEnv);
SAL_DLLPUBLIC_EXPORT void SAL_CALL uno_ext_getMapping(uno_Mapping **
ppMapping, uno_Environment * pFrom, uno_Environment * pTo)
SAL_THROW_EXTERN_C();

These are called by higher layers of UNO and eventually reach the
platform-specific code somehow; I am still investigating that part.



On Tue, Dec 4, 2018 at 7:18 AM Damjan Jovanovic <damjan@apache.org> wrote:

> Thank you Patricia.
>
> Yes knowing some x86_64 assembly would help, but don't go too far, it's
> only about 2000 lines of code on other platforms. I don't know much of it
> myself yet; just that the 32 bit registers grow to 64 bits and have an
> additional name starting with "R" for the 64 bit version (eg. the 32 bit
> EAX has a corresponding 64 bit RAX, EIP and RIP, etc.).
>
> The Win64 ABI has similarities to the *nix ABI (
> https://en.wikipedia.org/wiki/X86_calling_conventions#x86-64_calling_conventions)
> and we already have the *nix ABI implemented, so we might be able to reuse
> some of it. We can certainly copy its x86_64 assembly as needed ;).
>
> The code is all in main/bridges. I want to port that module to gbuild
> first, so I have a good understanding of its general structure.
>
> A LibreOffice developer blogged about his porting experience at
> http://tml-blog.blogspot.com/2011/03/
> Apparently exception handling was the hardest part.
>
>
>
>
> On Sun, Dec 2, 2018 at 10:39 PM Patricia Shanahan <pats@acm.org> wrote:
>
>> I have many years of professional assembly language programming
>> experience. I have learned several assembly languages, but not one for
>> Win64. I also have a good general understanding of stack management and
>> call/return from compiler and operating system work.
>>
>> Would it be useful for me to start learning the appropriate assembly
>> language and stack management? If so, I would like pointers to the
>> assembler and ABI etc. conventions.
>>
>> On 12/1/2018 12:22 AM, Damjan Jovanovic wrote:
>> > Hi
>> >
>> > At least 81 modules (44.26%) successfully build on Win64 now, up from 67
>> > (36.61%) before.
>> >
>> > At present the build breaks in main/bridges, which I can hack past, but
>> > then modules like cli_ure and i18npool break, probably because they need
>> > the missing Win64 UNO bridge.
>> >
>> > This Win64 <-> UNO bridge has to call arbitrary methods, translate
>> > arbitrary exceptions, etc. between UNO and C++. It has to be written
>> > predominantly in assembly language, and needs to implement the
>> platform's
>> > calling convention, deal with its ABI, RTTI, etc. - quite a challenge.
>> >
>> > Wish me luck, or join and help?
>> >
>> > Damjan
>> >
>>
>> ---
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>>
>>
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