1 files changed, 36 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index de00716..1772e7f 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -833,6 +833,42 @@ MCSection *TargetLoweringObjectFileELF::getSectionForJumpTable(
                                    /* AssociatedSymbol */ nullptr);
 }
 
+MCSection *
+TargetLoweringObjectFileELF::getSectionForLSDA(const Function &F,
+                                               const TargetMachine &TM) const {
+  // If neither COMDAT nor function sections, use the monolithic LSDA section.
+  if (!F.hasComdat() && !TM.getFunctionSections())
+    return LSDASection;
+
+  const auto *LSDA = cast<MCSectionELF>(LSDASection);
+  unsigned Flags = LSDA->getFlags();
+  StringRef Group;
+  if (F.hasComdat()) {
+    Group = F.getComdat()->getName();
+    Flags |= ELF::SHF_GROUP;
+  }
+
+  // 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);
+}
+
 bool TargetLoweringObjectFileELF::shouldPutJumpTableInFunctionSection(
     bool UsesLabelDifference, const Function &F) const {
   // We can always create relative relocations, so use another section