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[mips] Make TTypeEncoding indirect to allow .eh_frame to be read-only.

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Summary:
Following on from r209907 which made personality encodings indirect, do the
same for TType encodings. This fixes the case where a try/catch block needs
to generate references to, for example, std::exception in the
.gcc_except_table.

This commit uses DW_EH_PE_sdata8 for N64 as far as is possible at the moment.
However, it is possible to end up with DW_EH_PE_sdata4 when a TargetMachine is
not available. There's no risk of issues with inconsistency here since the
tables are self describing but it does mean there is a small chance of the
PC-relative offset being out of range for particularly large programs.

Reviewers: petarj

Reviewed By: petarj

Subscribers: srhines, joerg, tberghammer, llvm-commits

Differential Revision: http://reviews.llvm.org/D9669


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238190 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Sanders
2015-05-26 10:19:18 +00:00
parent eda9f8aa74
commit bda72d8098
5 changed files with 48 additions and 11 deletions
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8
lib/Target/Mips/MipsTargetObjectFile.cpp
View File

@ -37,6 +37,7 @@ ExternSData("mextern-sdata", cl::Hidden,
cl::init(true));
void MipsTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){
this->TM = &static_cast<const MipsTargetMachine &>(TM);
TargetLoweringObjectFileELF::Initialize(Ctx, TM);
InitializeELF(TM.Options.UseInitArray);
@ -45,7 +46,6 @@ void MipsTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){
SmallBSSSection = getContext().getELFSection(".sbss", ELF::SHT_NOBITS,
ELF::SHF_WRITE | ELF::SHF_ALLOC);
this->TM = &static_cast<const MipsTargetMachine &>(TM);
}
// A address must be loaded from a small section if its size is less than the
@ -146,3 +146,9 @@ MipsTargetObjectFile::getSectionForConstant(SectionKind Kind,
// Otherwise, we work the same as ELF.
return TargetLoweringObjectFileELF::getSectionForConstant(Kind, C);
}
unsigned MipsTargetObjectFile::SelectMipsTTypeEncoding() const {
return dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
(TM->getABI().ArePtrs64bit() ? dwarf::DW_EH_PE_sdata8
: dwarf::DW_EH_PE_sdata4);
}