llvm dev - Feb 2016 - Who patches the fixups?

Hi,

I am trying to undertand which code in LLVM patches the fixups generated by
assembler.

Here is what I am doing: I use "llvm-mc" to compile X86 assembly code,
like
below:

$ echo "jmp 5000" | ./bin/llvm-mc -assemble -triple=i386
-show-encoding
-x86-asm-syntax=att -output-asm-variant=1
    .text
    jmp    5000                    # encoding: [0xeb,A]
                                        #   fixup A - offset: 1, value:
5000-1, kind: FK_PCRel_1

Now there are fixups in the encoding, and this must be patches by LLVM
somewhere. My best guess is that the next phase after assembly compilation
will patch them, but not very sure where in LLVM compiler does this.

Any hints on how the compiler patch the fixups after assembler phase? (a
pointer to source code is great, so i can read the source and have better
understanding)

Thanks,
Jun
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On 2/16/2016 7:04 AM, Jun Koi via llvm-dev wrote:
>
> I am trying to undertand which code in LLVM patches the fixups generated
> by assembler.
>
What do you mean exactly?  The actual machine code is generated by 
MCCodeEmitter, for example
lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp

The relocations from the object files are applied by the linker, not LLVM.

-Krzysztof


-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, 
hosted by The Linux Foundation

On Tue, Feb 16, 2016 at 10:59 PM, Krzysztof Parzyszek via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> On 2/16/2016 7:04 AM, Jun Koi via llvm-dev wrote:
>
>>
>> I am trying to undertand which code in LLVM patches the fixups
generated
>> by assembler.
>>
>>
> What do you mean exactly?  The actual machine code is generated by
> MCCodeEmitter, for example
> lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
>
> The relocations from the object files are applied by the linker, not LLVM.
>
Do you mean the LLVM linker will do the relocation?

Do you have any hints on where to look at linker source of LLVM to see how
this is done?


Thanks.


>
> -Krzysztof
>
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted
> by The Linux Foundation
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> llvm-dev at lists.llvm.org
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>
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