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[XCOFF][AIX] Generate LSDA data and compact unwind section on AIX

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Summary:
AIX uses the existing EH infrastructure in clang and llvm.
The major differences would be
1. AIX do not have CFI instructions.
2. AIX uses a new personality routine, named __xlcxx_personality_v1.
   It doesn't use the GCC personality rountine, because the
   interoperability is not there yet on AIX.
3. AIX do not use eh_frame sections. Instead, it would use a eh_info
section (compat unwind section) to store the information about
personality routine and LSDA data address.

Reviewed By: daltenty, hubert.reinterpretcast

Differential Revision: https://reviews.llvm.org/D91455
This commit is contained in:
jasonliu
2020-12-02 14:48:52 +00:00
parent 06d5ff1803
commit 60c6f78bef
17 changed files with 309 additions and 10 deletions
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lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+5 -1
View File
@@ -2272,9 +2272,13 @@ MCSection *TargetLoweringObjectFileXCOFF::getSectionForConstant(
void TargetLoweringObjectFileXCOFF::Initialize(MCContext &Ctx,
const TargetMachine &TgtM) {
TargetLoweringObjectFile::Initialize(Ctx, TgtM);
TTypeEncoding = 0;
TTypeEncoding =
dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_datarel |
(TgtM.getTargetTriple().isArch32Bit() ? dwarf::DW_EH_PE_sdata4
: dwarf::DW_EH_PE_sdata8);
PersonalityEncoding = 0;
LSDAEncoding = 0;
CallSiteEncoding = dwarf::DW_EH_PE_udata4;
}
MCSection *TargetLoweringObjectFileXCOFF::getStaticCtorSection(