[PATCH][lld] Begin AArch64 support

[Shankar Easwaran]

Are you planning to commit your work on this ?

On 5/6/2013 1:05 PM, Shankar Easwaran wrote:
> Hi Tim,
>>> The way to test would be :-
>>>
>>> lld -flavor gnu -target [x86_64|hexagon|x86] ....
>> This was what gave me the linker script error, if I'm interpreting you
>> correctly:
>>
>> $ cat simple.s
>>          .text
>>          .global _start
>>          .type _start, at function
>> _start:
>>          callq bar
>>          ret
>> $ clang simple.s -c- -o- \
>>    | lld -flavor gnu -target x86_64 emit-yaml -r - \
>>    | lld -flavor gnu -target x86_64 -
>> Failed to read file: -: Error parsing linker script
>>
>> Everything except that last command is just to get an obviously
>> correct YAML file containing (in this case) an R_X86_64_PC32. The idea
>> is to make sure that last command can parse "R_X86_64_PC32" as a
>> string and knows what to do with it, at least as far as constructing
>> an internal representation.
> The problem that you are seeing here is because of 
> ELFTargetInfo::parseFile interpreting the input file as a script.
>
> ELFTargetInfo, parses the input file using the following
>
> - If the input contains a ELF magic, treat it as ELF file
> - If the input ends in extension *objtxt*, treat it as YAML
> - otherwise treat it as linker script
>
> In your case the input is being treated as a linker script as, stdin 
> based yaml support doesnot exist.
>
> Can you convert the file to .objtxt and use that in the command line.
>
>>> For your case you need to handle aarch64 seperately (see lld-core.cpp).
>> To me it looks like Nick Kledzik's refactoring last month made
>> lld-core dead code. It's not added in CMakeLists.txt any more.
>>
>> The replacement (lib/Driver/CoreDriver.cpp) appears to be completely
>> target-agnostic. Is that likely just because no-one has got around to
>> adding target-specific intelligence to it yet, or is it a design
>> decision?
> Ah sorry about the wrong comment. The code changes that you would need 
> to refer would be
> in function ELFTargetInfo::create in file 
> lib/ReaderWriter/ELF/ELFTargetInfo.cpp
>
> Thanks
>
> Shankar Easwaran
>
>
>
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