1 files changed, 17 insertions, 16 deletions

diff --git a/llvm/lib/MC/MCStreamer.cpp b/llvm/lib/MC/MCStreamer.cpp
index c3ecf8f..add021b 100644
--- a/llvm/lib/MC/MCStreamer.cpp
+++ b/llvm/lib/MC/MCStreamer.cpp
@@ -415,7 +415,7 @@ void MCStreamer::emitLabel(MCSymbol *Symbol, SMLoc Loc) {
 void MCStreamer::emitConditionalAssignment(MCSymbol *Symbol,
                                            const MCExpr *Value) {}
 
-void MCStreamer::emitCFISections(bool EH, bool Debug) {}
+void MCStreamer::emitCFISections(bool EH, bool Debug, bool SFrame) {}
 
 void MCStreamer::emitCFIStartProc(bool IsSimple, SMLoc Loc) {
   if (!FrameInfoStack.empty() &&
@@ -838,8 +838,8 @@ static MCSection *getWinCFISection(MCContext &Context, unsigned *NextWinCFIID,
   if (TextSec == Context.getObjectFileInfo()->getTextSection())
     return MainCFISec;
 
-  const auto *TextSecCOFF = cast<MCSectionCOFF>(TextSec);
-  auto *MainCFISecCOFF = cast<MCSectionCOFF>(MainCFISec);
+  const auto *TextSecCOFF = static_cast<const MCSectionCOFF *>(TextSec);
+  auto *MainCFISecCOFF = static_cast<MCSectionCOFF *>(MainCFISec);
   unsigned UniqueID = TextSecCOFF->getOrAssignWinCFISectionID(NextWinCFIID);
 
   // If this section is COMDAT, this unwind section should be COMDAT associative
@@ -1314,9 +1314,20 @@ void MCStreamer::emitZerofill(MCSection *, MCSymbol *, uint64_t, Align, SMLoc) {
 }
 void MCStreamer::emitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
                                 uint64_t Size, Align ByteAlignment) {}
-void MCStreamer::changeSection(MCSection *Section, uint32_t) {
-  CurFrag = &Section->getDummyFragment();
+
+void MCStreamer::changeSection(MCSection *Sec, uint32_t) {
+  CurFrag = &Sec->getDummyFragment();
+  auto *Sym = Sec->getBeginSymbol();
+  if (!Sym || !Sym->isUndefined())
+    return;
+  // In Mach-O, DWARF sections use Begin as a temporary label, requiring a label
+  // definition, unlike section symbols in other file formats.
+  if (getContext().getObjectFileType() == MCContext::IsMachO)
+    emitLabel(Sym);
+  else
+    Sym->setFragment(CurFrag);
 }
+
 void MCStreamer::emitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
 void MCStreamer::emitBytes(StringRef Data) {}
 void MCStreamer::emitBinaryData(StringRef Data) { emitBytes(Data); }
@@ -1358,9 +1369,6 @@ void MCStreamer::switchSection(MCSection *Section, uint32_t Subsection) {
     changeSection(Section, Subsection);
     SectionStack.back().first = MCSectionSubPair(Section, Subsection);
     assert(!Section->hasEnded() && "Section already ended");
-    MCSymbol *Sym = Section->getBeginSymbol();
-    if (Sym && !Sym->isInSection())
-      emitLabel(Sym);
   }
 }
 
@@ -1387,9 +1395,6 @@ void MCStreamer::switchSectionNoPrint(MCSection *Section) {
   SectionStack.back().second = SectionStack.back().first;
   SectionStack.back().first = MCSectionSubPair(Section, 0);
   changeSection(Section, 0);
-  MCSymbol *Sym = Section->getBeginSymbol();
-  if (Sym && !Sym->isInSection())
-    emitLabel(Sym);
 }
 
 MCSymbol *MCStreamer::endSection(MCSection *Section) {
@@ -1404,7 +1409,7 @@ MCSymbol *MCStreamer::endSection(MCSection *Section) {
   return Sym;
 }
 
-void MCStreamer::insert(MCFragment *F) {
+void MCStreamer::addFragment(MCFragment *F) {
   auto *Sec = CurFrag->getParent();
   F->setParent(Sec);
   F->setLayoutOrder(CurFrag->getLayoutOrder() + 1);
@@ -1413,10 +1418,6 @@ void MCStreamer::insert(MCFragment *F) {
   Sec->curFragList()->Tail = F;
 }
 
-void MCStreamer::newFragment() {
-  insert(getContext().allocFragment<MCFragment>());
-}
-
 static VersionTuple
 targetVersionOrMinimumSupportedOSVersion(const Triple &Target,
                                          VersionTuple TargetVersion) {