diff options
Diffstat (limited to 'llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp | 35 |
1 files changed, 15 insertions, 20 deletions
diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp index fe64b38..cccac07 100644 --- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp +++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp @@ -834,9 +834,8 @@ MCSection *TargetLoweringObjectFileELF::getSectionForJumpTable( /* AssociatedSymbol */ nullptr); } -MCSection * -TargetLoweringObjectFileELF::getSectionForLSDA(const Function &F, - const TargetMachine &TM) const { +MCSection *TargetLoweringObjectFileELF::getSectionForLSDA( + const Function &F, const MCSymbol &FnSym, const TargetMachine &TM) const { // If neither COMDAT nor function sections, use the monolithic LSDA section. // Re-use this path if LSDASection is null as in the Arm EHABI. if (!LSDASection || (!F.hasComdat() && !TM.getFunctionSections())) @@ -845,30 +844,26 @@ TargetLoweringObjectFileELF::getSectionForLSDA(const Function &F, const auto *LSDA = cast<MCSectionELF>(LSDASection); unsigned Flags = LSDA->getFlags(); StringRef Group; + const MCSymbolELF *LinkedToSym = nullptr; if (F.hasComdat()) { Group = F.getComdat()->getName(); Flags |= ELF::SHF_GROUP; } + // Use SHF_LINK_ORDER to facilitate --gc-sections if we can use GNU ld>=2.36 + // or LLD, which support mixed SHF_LINK_ORDER & non-SHF_LINK_ORDER. + if (TM.getFunctionSections() && + (getContext().getAsmInfo()->useIntegratedAssembler() && + getContext().getAsmInfo()->binutilsIsAtLeast(2, 36))) { + Flags |= ELF::SHF_LINK_ORDER; + LinkedToSym = cast<MCSymbolELF>(&FnSym); + } // Append the function name as the suffix like GCC, assuming // -funique-section-names applies to .gcc_except_table sections. - if (TM.getUniqueSectionNames()) - return getContext().getELFSection(LSDA->getName() + "." + F.getName(), - LSDA->getType(), Flags, 0, Group, - MCSection::NonUniqueID, nullptr); - - // Allocate a unique ID if function sections && (integrated assembler or GNU - // as>=2.35). Note we could use SHF_LINK_ORDER to facilitate --gc-sections but - // that would require that we know the linker is a modern LLD (12.0 or later). - // GNU ld as of 2.35 does not support mixed SHF_LINK_ORDER & - // non-SHF_LINK_ORDER components in an output section - // https://sourceware.org/bugzilla/show_bug.cgi?id=26256 - unsigned ID = TM.getFunctionSections() && - getContext().getAsmInfo()->useIntegratedAssembler() - ? NextUniqueID++ - : MCSection::NonUniqueID; - return getContext().getELFSection(LSDA->getName(), LSDA->getType(), Flags, 0, - Group, ID, nullptr); + return getContext().getELFSection( + (TM.getUniqueSectionNames() ? LSDA->getName() + "." + F.getName() + : LSDA->getName()), + LSDA->getType(), Flags, 0, Group, MCSection::NonUniqueID, LinkedToSym); } bool TargetLoweringObjectFileELF::shouldPutJumpTableInFunctionSection( |