[MC] Remove getFragmentList uses. NFC

Author: MaskRay

llvm/include/llvm/MC/MCSection.h

@@ -189,6 +189,7 @@ class MCSection {
 
   iterator end() { return Fragments.end(); }
   const_iterator end() const { return Fragments.end(); }
+  bool empty() const { return Fragments.empty(); }
 
   void addFragment(MCFragment &F) { Fragments.push_back(&F); }
 

llvm/lib/MC/MCAssembler.cpp

@@ -820,7 +820,7 @@ void MCAssembler::layout(MCAsmLayout &Layout) {
   for (MCSection &Sec : *this) {
     // Create dummy fragments to eliminate any empty sections, this simplifies
     // layout.
-    if (Sec.getFragmentList().empty())
+    if (Sec.empty())
       new MCDataFragment(&Sec);
 
     Sec.setOrdinal(SectionIndex++);

llvm/lib/MC/MCObjectStreamer.cpp

@@ -202,7 +202,7 @@ void MCObjectStreamer::emitFrames(MCAsmBackend *MAB) {
 MCFragment *MCObjectStreamer::getCurrentFragment() const {
   assert(getCurrentSectionOnly() && "No current section!");
 
-  if (CurInsertionPoint != getCurrentSectionOnly()->getFragmentList().begin())
+  if (CurInsertionPoint != getCurrentSectionOnly()->begin())
     return &*std::prev(CurInsertionPoint);
 
   return nullptr;

llvm/lib/MC/MCSection.cpp

@@ -130,10 +130,13 @@ LLVM_DUMP_METHOD void MCSection::dump() const {
 
   OS << "<MCSection Name:" << getName();
   OS << " Fragments:[\n      ";
-  for (auto it = begin(), ie = end(); it != ie; ++it) {
-    if (it != begin())
+  bool First = true;
+  for (auto &F : *this) {
+    if (First)
+      First = false;
+    else
       OS << ",\n      ";
-    it->dump();
+    F.dump();
   }
   OS << "]>";
 }

llvm/lib/MC/MachObjectWriter.cpp

@@ -767,11 +767,9 @@ uint64_t MachObjectWriter::writeObject(MCAssembler &Asm,
   if (!Asm.CGProfile.empty()) {
     MCSection *CGProfileSection = Asm.getContext().getMachOSection(
         "__LLVM", "__cg_profile", 0, SectionKind::getMetadata());
-    MCDataFragment *Frag = dyn_cast_or_null<MCDataFragment>(
-        &*CGProfileSection->getFragmentList().begin());
-    assert(Frag && "call graph profile section not reserved");
-    Frag->getContents().clear();
-    raw_svector_ostream OS(Frag->getContents());
+    auto &Frag = cast<MCDataFragment>(*CGProfileSection->begin());
+    Frag.getContents().clear();
+    raw_svector_ostream OS(Frag.getContents());
     for (const MCAssembler::CGProfileEntry &CGPE : Asm.CGProfile) {
       uint32_t FromIndex = CGPE.From->getSymbol().getIndex();
       uint32_t ToIndex = CGPE.To->getSymbol().getIndex();

llvm/lib/MC/WasmObjectWriter.cpp

@@ -1857,14 +1857,9 @@ uint64_t WasmObjectWriter::writeOneObject(MCAssembler &Asm,
       report_fatal_error(".fini_array sections are unsupported");
     if (!WS.getName().starts_with(".init_array"))
       continue;
-    if (WS.getFragmentList().empty())
-      continue;
-
-    // init_array is expected to contain a single non-empty data fragment
-    if (WS.getFragmentList().size() != 3)
-      report_fatal_error("only one .init_array section fragment supported");
-
     auto IT = WS.begin();
+    if (IT == WS.end())
+      continue;
     const MCFragment &EmptyFrag = *IT;
     if (EmptyFrag.getKind() != MCFragment::FT_Data)
       report_fatal_error(".init_array section should be aligned");

llvm/lib/MC/WinCOFFObjectWriter.cpp

@@ -354,7 +354,7 @@ void WinCOFFWriter::defineSection(const MCSectionCOFF &MCSec,
   Section->MCSection = &MCSec;
   SectionMap[&MCSec] = Section;
 
-  if (UseOffsetLabels && !MCSec.getFragmentList().empty()) {
+  if (UseOffsetLabels && !MCSec.empty()) {
     const uint32_t Interval = 1 << OffsetLabelIntervalBits;
     uint32_t N = 1;
     for (uint32_t Off = Interval, E = Layout.getSectionAddressSize(&MCSec);

llvm/lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp

@@ -329,7 +329,7 @@ void ARMELFObjectWriter::addTargetSectionFlags(MCContext &Ctx,
   MCSectionELF *TextSection =
       static_cast<MCSectionELF *>(Ctx.getObjectFileInfo()->getTextSection());
   if (Sec.getKind().isExecuteOnly() && !TextSection->hasInstructions()) {
-    for (auto &F : TextSection->getFragmentList())
+    for (auto &F : *TextSection)
       if (auto *DF = dyn_cast<MCDataFragment>(&F))
         if (!DF->getContents().empty())
           return;

llvm/lib/Target/Hexagon/MCTargetDesc/HexagonAsmBackend.cpp

@@ -713,15 +713,14 @@ class HexagonAsmBackend : public MCAsmBackend {
   void finishLayout(MCAssembler const &Asm,
                     MCAsmLayout &Layout) const override {
     for (auto *I : Layout.getSectionOrder()) {
-      auto &Fragments = I->getFragmentList();
-      for (auto &J : Fragments) {
+      for (auto &J : *I) {
         switch (J.getKind()) {
         default:
           break;
         case MCFragment::FT_Align: {
           auto Size = Asm.computeFragmentSize(Layout, J);
           for (auto K = J.getIterator();
-               K != Fragments.begin() && Size >= HEXAGON_PACKET_SIZE;) {
+               K != I->begin() && Size >= HEXAGON_PACKET_SIZE;) {
             --K;
             switch (K->getKind()) {
             default:

llvm/tools/dsymutil/MachOUtils.cpp

@@ -630,7 +630,7 @@ bool generateDsymCompanion(
 
   // Emit the Dwarf sections contents.
   for (const MCSection &Sec : MCAsm) {
-    if (Sec.begin() == Sec.end())
+    if (Sec.empty())
       continue;
 
     uint64_t Pos = OutFile.tell();