MCFragment: Remove MCDataFragment/MCRelaxableFragment type aliases

Follow-up to llvm#148544

Author: MaskRay

llvm/include/llvm/MC/MCAsmBackend.h

@@ -242,8 +242,7 @@ class LLVM_ABI MCAsmBackend {
 
   bool isDarwinCanonicalPersonality(const MCSymbol *Sym) const;
 
-  // Return STI for fragments of type MCRelaxableFragment and MCFragment
-  // with hasInstructions() == true.
+  // Return STI for fragments with hasInstructions() == true.
   static const MCSubtargetInfo *getSubtargetInfo(const MCFragment &F);
 };
 

llvm/include/llvm/MC/MCSection.h

@@ -226,13 +226,13 @@ class MCFragment {
   FragmentType Kind;
 
 protected:
-  /// Used by subclasses for better packing.
+  bool LinkerRelaxable : 1;
+
+  /// Used by certain fragment types for better packing.
   ///
-  /// MCEncodedFragment
+  /// FT_Data, FT_Relaxable
   bool HasInstructions : 1;
-  /// MCDataFragment
-  bool LinkerRelaxable : 1;
-  /// MCRelaxableFragment: x86-specific
+  /// FT_Relaxable, x86-specific
   bool AllowAutoPadding : 1;
 
   uint32_t ContentStart = 0;
@@ -487,10 +487,6 @@ class MCEncodedFragment : public MCFragment {
       : MCFragment(FType, HasInstructions) {}
 };
 
-// TODO Delete
-using MCDataFragment = MCFragment;
-using MCRelaxableFragment = MCFragment;
-
 class MCAlignFragment : public MCFragment {
   /// Flag to indicate that (optimal) NOPs should be emitted instead
   /// of using the provided value. The exact interpretation of this flag is

llvm/lib/MC/MCAssembler.cpp

@@ -966,8 +966,7 @@ bool MCAssembler::relaxFragment(MCFragment &F) {
   default:
     return false;
   case MCFragment::FT_Relaxable:
-    assert(!getRelaxAll() &&
-           "Did not expect a MCRelaxableFragment in RelaxAll mode");
+    assert(!getRelaxAll() && "Did not expect a FT_Relaxable in RelaxAll mode");
     return relaxInstruction(F);
   case MCFragment::FT_LEB:
     return relaxLEB(F);

llvm/lib/MC/MCFragment.cpp

@@ -28,7 +28,7 @@ static_assert(std::is_trivially_destructible_v<MCFragment>,
               "fragment classes must be trivially destructible");
 
 MCFragment::MCFragment(FragmentType Kind, bool HasInstructions)
-    : Kind(Kind), HasInstructions(HasInstructions), LinkerRelaxable(false),
+    : Kind(Kind), LinkerRelaxable(false), HasInstructions(HasInstructions),
       AllowAutoPadding(false) {
   static_assert(sizeof(MCFragment::Tail) <= 16,
                 "Keep the variable-size tail small");

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

@@ -638,7 +638,7 @@ class ARMELFStreamer : public MCELFStreamer {
       Offset = 0;
     }
     bool hasInfo() { return F != nullptr; }
-    MCDataFragment *F = nullptr;
+    MCFragment *F = nullptr;
     uint64_t Offset = 0;
     ElfMappingSymbol State = EMS_None;
   };
@@ -686,7 +686,7 @@ class ARMELFStreamer : public MCELFStreamer {
     Symbol->setBinding(ELF::STB_LOCAL);
   }
 
-  void emitMappingSymbol(StringRef Name, MCDataFragment &F, uint64_t Offset) {
+  void emitMappingSymbol(StringRef Name, MCFragment &F, uint64_t Offset) {
     auto *Symbol = cast<MCSymbolELF>(getContext().createLocalSymbol(Name));
     emitLabelAtPos(Symbol, SMLoc(), F, Offset);
     Symbol->setType(ELF::STT_NOTYPE);
@@ -1207,7 +1207,7 @@ inline void ARMELFStreamer::SwitchToExIdxSection(const MCSymbol &FnStart) {
 }
 
 void ARMELFStreamer::EmitFixup(const MCExpr *Expr, MCFixupKind Kind) {
-  MCDataFragment *Frag = getOrCreateDataFragment();
+  MCFragment *Frag = getOrCreateDataFragment();
   Frag->addFixup(MCFixup::create(Frag->getContents().size(), Expr, Kind));
 }
 
@@ -1295,7 +1295,7 @@ void ARMELFStreamer::EmitPersonalityFixup(StringRef Name) {
       MCSymbolRefExpr::create(PersonalitySym, ARM::S_ARM_NONE, getContext());
 
   visitUsedExpr(*PersonalityRef);
-  MCDataFragment *DF = getOrCreateDataFragment();
+  MCFragment *DF = getOrCreateDataFragment();
   DF->addFixup(
       MCFixup::create(DF->getContents().size(), PersonalityRef, FK_Data_4));
 }

llvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp

@@ -1033,42 +1033,42 @@ MCELFStreamer &MipsTargetELFStreamer::getStreamer() {
 }
 
 void MipsTargetELFStreamer::emitGPRel32Value(const MCExpr *Value) {
-  MCDataFragment *DF = getStreamer().getOrCreateDataFragment();
+  MCFragment *DF = getStreamer().getOrCreateDataFragment();
   DF->addFixup(MCFixup::create(DF->getContents().size(), Value,
                                Mips::fixup_Mips_GPREL32));
   DF->appendContents(4, 0);
 }
 
 void MipsTargetELFStreamer::emitGPRel64Value(const MCExpr *Value) {
-  MCDataFragment *DF = getStreamer().getOrCreateDataFragment();
+  MCFragment *DF = getStreamer().getOrCreateDataFragment();
   DF->addFixup(MCFixup::create(DF->getContents().size(), Value,
                                Mips::fixup_Mips_GPREL32));
   DF->appendContents(8, 0);
 }
 
 void MipsTargetELFStreamer::emitDTPRel32Value(const MCExpr *Value) {
-  MCDataFragment *DF = getStreamer().getOrCreateDataFragment();
+  MCFragment *DF = getStreamer().getOrCreateDataFragment();
   DF->addFixup(MCFixup::create(DF->getContents().size(), Value,
                                Mips::fixup_Mips_DTPREL32));
   DF->appendContents(4, 0);
 }
 
 void MipsTargetELFStreamer::emitDTPRel64Value(const MCExpr *Value) {
-  MCDataFragment *DF = getStreamer().getOrCreateDataFragment();
+  MCFragment *DF = getStreamer().getOrCreateDataFragment();
   DF->addFixup(MCFixup::create(DF->getContents().size(), Value,
                                Mips::fixup_Mips_DTPREL64));
   DF->appendContents(8, 0);
 }
 
 void MipsTargetELFStreamer::emitTPRel32Value(const MCExpr *Value) {
-  MCDataFragment *DF = getStreamer().getOrCreateDataFragment();
+  MCFragment *DF = getStreamer().getOrCreateDataFragment();
   DF->addFixup(MCFixup::create(DF->getContents().size(), Value,
                                Mips::fixup_Mips_TPREL32));
   DF->appendContents(4, 0);
 }
 
 void MipsTargetELFStreamer::emitTPRel64Value(const MCExpr *Value) {
-  MCDataFragment *DF = getStreamer().getOrCreateDataFragment();
+  MCFragment *DF = getStreamer().getOrCreateDataFragment();
   DF->addFixup(MCFixup::create(DF->getContents().size(), Value,
                                Mips::fixup_Mips_TPREL64));
   DF->appendContents(8, 0);

llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFStreamer.cpp

@@ -155,11 +155,10 @@ void PPCELFStreamer::emitGOTToPCRelReloc(const MCInst &Inst) {
   const MCExpr *SubExpr2 =
       MCBinaryExpr::createSub(CurrentLocationExpr, SubExpr, getContext());
 
-  MCDataFragment *DF = static_cast<MCDataFragment *>(LabelSym->getFragment());
-  assert(DF && "Expecting a valid data fragment.");
-  MCFixupKind FixupKind = static_cast<MCFixupKind>(FirstLiteralRelocationKind +
-                                                   ELF::R_PPC64_PCREL_OPT);
-  DF->addFixup(MCFixup::create(LabelSym->getOffset() - 8, SubExpr2, FixupKind));
+  MCFragment *F = LabelSym->getFragment();
+  F->addFixup(
+      MCFixup::create(LabelSym->getOffset() - 8, SubExpr2,
+                      FirstLiteralRelocationKind + ELF::R_PPC64_PCREL_OPT));
   emitLabel(CurrentLocation, Inst.getLoc());
 }
 

llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp

@@ -567,8 +567,7 @@ void X86AsmBackend::emitInstructionEnd(MCObjectStreamer &OS,
   // DataFragment, so that we can get the size of instructions later in
   // MCAssembler::relaxBoundaryAlign. The easiest way is to insert a new empty
   // DataFragment.
-  if (isa_and_nonnull<MCDataFragment>(CF))
-    OS.insert(OS.getContext().allocFragment<MCDataFragment>());
+  OS.insert(OS.getContext().allocFragment<MCFragment>());
 
   // Update the maximum alignment on the current section if necessary.
   MCSection *Sec = OS.getCurrentSectionOnly();