[llvm] r222538 - Allow FDE references outside the +/-2GB range supported by PC relative

[Duncan P. N. Exon Smith]

I reverted this in r222542, as it's causing bot failures:

    http://lab.llvm.org:8080/green/job/clang-stage1-cmake-RA-incremental/1189/
    http://lab.llvm.org:8080/green/job/clang-stage1-configure-RA_check/1391/

and blocking all our internal builders.

These tests are failing:

Failing Tests (20):
    LLVM :: MC/ELF/cfi-adjust-cfa-offset.s
    LLVM :: MC/ELF/cfi-advance-loc2.s
    LLVM :: MC/ELF/cfi-def-cfa-offset.s
    LLVM :: MC/ELF/cfi-def-cfa-register.s
    LLVM :: MC/ELF/cfi-def-cfa.s
    LLVM :: MC/ELF/cfi-escape.s
    LLVM :: MC/ELF/cfi-offset.s
    LLVM :: MC/ELF/cfi-register.s
    LLVM :: MC/ELF/cfi-rel-offset.s
    LLVM :: MC/ELF/cfi-rel-offset2.s
    LLVM :: MC/ELF/cfi-remember.s
    LLVM :: MC/ELF/cfi-restore.s
    LLVM :: MC/ELF/cfi-same-value.s
    LLVM :: MC/ELF/cfi-signal-frame.s
    LLVM :: MC/ELF/cfi-undefined.s
    LLVM :: MC/ELF/cfi-window-save.s
    LLVM :: MC/ELF/cfi-zero-addr-delta.s
    LLVM :: MC/ELF/cfi.s
    LLVM :: MC/ELF/pr19430.s
    LLVM :: MC/X86/fde-reloc.s

Let me know if you can't reproduce locally.

> On 2014-Nov-21, at 06:42, Joerg Sonnenberger <joerg at bec.de> wrote:
> 
> Author: joerg
> Date: Fri Nov 21 08:42:43 2014
> New Revision: 222538
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=222538&view=rev
> Log:
> Allow FDE references outside the +/-2GB range supported by PC relative
> offsets for code models other than small/medium. For JIT application,
> memory layout is less controlled and can result in truncations
> otherwise. 
> 
> Patch from Akos Kiss.
> 
> Differential Revision: http://reviews.llvm.org/D6079
> 
> Modified:
>    llvm/trunk/lib/MC/MCObjectFileInfo.cpp

Testcase?

> Modified: llvm/trunk/lib/MC/MCObjectFileInfo.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/MC/MCObjectFileInfo.cpp?rev=222538&r1=222537&r2=222538&view=diff
> ==============================================================================
> --- llvm/trunk/lib/MC/MCObjectFileInfo.cpp (original)
> +++ llvm/trunk/lib/MC/MCObjectFileInfo.cpp Fri Nov 21 08:42:43 2014
> @@ -273,6 +273,17 @@ void MCObjectFileInfo::InitELFMCObjectFi
>   case Triple::mips64el:
>     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
>     break;
> +  case Triple::x86_64:
> +    if (RelocM == Reloc::PIC_) {
> +      FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
> +        ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
> +         ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
> +    } else {
> +      FDECFIEncoding =
> +        (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
> +        ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
> +    }
> +    break;
>   default:
>     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
>     break;
> 
> 
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