Move the ARM specific parts of the ELF writer to Target/ARM.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147115 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 19 insertions, 273 deletions

diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp
index b694c18..ae29753 100644
--- a/lib/MC/ELFObjectWriter.cpp
+++ b/lib/MC/ELFObjectWriter.cpp
@@ -25,11 +25,9 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/ELF.h"
 #include "llvm/Support/CommandLine.h"
-#include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringSwitch.h"
 
 #include "../Target/Mips/MCTargetDesc/MipsFixupKinds.h"
-#include "../Target/ARM/MCTargetDesc/ARMFixupKinds.h"
 #include "../Target/PowerPC/MCTargetDesc/PPCFixupKinds.h"
 
 #include <vector>
@@ -1260,9 +1258,8 @@ MCObjectWriter *llvm::createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
   switch (MOTW->getEMachine()) {
     case ELF::EM_386:
     case ELF::EM_X86_64:
-      return new ELFObjectWriter(MOTW, OS, IsLittleEndian); break;
     case ELF::EM_ARM:
-      return new ARMELFObjectWriter(MOTW, OS, IsLittleEndian); break;
+      return new ELFObjectWriter(MOTW, OS, IsLittleEndian); break;
     case ELF::EM_MBLAZE:
       return new MBlazeELFObjectWriter(MOTW, OS, IsLittleEndian); break;
     case ELF::EM_PPC:
@@ -1284,243 +1281,6 @@ unsigned ELFObjectWriter::GetRelocType(const MCValue &Target,
 }
 
 /// START OF SUBCLASSES for ELFObjectWriter
-//===- ARMELFObjectWriter -------------------------------------------===//
-
-ARMELFObjectWriter::ARMELFObjectWriter(MCELFObjectTargetWriter *MOTW,
-                                       raw_ostream &_OS,
-                                       bool IsLittleEndian)
-  : ELFObjectWriter(MOTW, _OS, IsLittleEndian)
-{}
-
-ARMELFObjectWriter::~ARMELFObjectWriter()
-{}
-
-// FIXME: get the real EABI Version from the Triple.
-unsigned ARMELFObjectWriter::getEFlags() const {
-  return ELF::EF_ARM_EABIMASK & DefaultEABIVersion;
-}
-
-// In ARM, _MergedGlobals and other most symbols get emitted directly.
-// I.e. not as an offset to a section symbol.
-// This code is an approximation of what ARM/gcc does.
-
-STATISTIC(PCRelCount, "Total number of PIC Relocations");
-STATISTIC(NonPCRelCount, "Total number of non-PIC relocations");
-
-const MCSymbol *ARMELFObjectWriter::ExplicitRelSym(const MCAssembler &Asm,
-                                                   const MCValue &Target,
-                                                   const MCFragment &F,
-                                                   const MCFixup &Fixup,
-                                                   bool IsPCRel) const {
-  const MCSymbol &Symbol = Target.getSymA()->getSymbol();
-  bool EmitThisSym = false;
-
-  const MCSectionELF &Section =
-    static_cast<const MCSectionELF&>(Symbol.getSection());
-  bool InNormalSection = true;
-  unsigned RelocType = 0;
-  RelocType = GetRelocTypeInner(Target, Fixup, IsPCRel);
-
-  DEBUG(
-      const MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind();
-      MCSymbolRefExpr::VariantKind Kind2;
-      Kind2 = Target.getSymB() ?  Target.getSymB()->getKind() :
-        MCSymbolRefExpr::VK_None;
-      dbgs() << "considering symbol "
-        << Section.getSectionName() << "/"
-        << Symbol.getName() << "/"
-        << " Rel:" << (unsigned)RelocType
-        << " Kind: " << (int)Kind << "/" << (int)Kind2
-        << " Tmp:"
-        << Symbol.isAbsolute() << "/" << Symbol.isDefined() << "/"
-        << Symbol.isVariable() << "/" << Symbol.isTemporary()
-        << " Counts:" << PCRelCount << "/" << NonPCRelCount << "\n");
-
-  if (IsPCRel) { ++PCRelCount;
-    switch (RelocType) {
-    default:
-      // Most relocation types are emitted as explicit symbols
-      InNormalSection =
-        StringSwitch<bool>(Section.getSectionName())
-        .Case(".data.rel.ro.local", false)
-        .Case(".data.rel", false)
-        .Case(".bss", false)
-        .Default(true);
-      EmitThisSym = true;
-      break;
-    case ELF::R_ARM_ABS32:
-      // But things get strange with R_ARM_ABS32
-      // In this case, most things that go in .rodata show up
-      // as section relative relocations
-      InNormalSection =
-        StringSwitch<bool>(Section.getSectionName())
-        .Case(".data.rel.ro.local", false)
-        .Case(".data.rel", false)
-        .Case(".rodata", false)
-        .Case(".bss", false)
-        .Default(true);
-      EmitThisSym = false;
-      break;
-    }
-  } else {
-    NonPCRelCount++;
-    InNormalSection =
-      StringSwitch<bool>(Section.getSectionName())
-      .Case(".data.rel.ro.local", false)
-      .Case(".rodata", false)
-      .Case(".data.rel", false)
-      .Case(".bss", false)
-      .Default(true);
-
-    switch (RelocType) {
-    default: EmitThisSym = true; break;
-    case ELF::R_ARM_ABS32: EmitThisSym = false; break;
-    }
-  }
-
-  if (EmitThisSym)
-    return &Symbol;
-  if (! Symbol.isTemporary() && InNormalSection) {
-    return &Symbol;
-  }
-  return NULL;
-}
-
-// Need to examine the Fixup when determining whether to 
-// emit the relocation as an explicit symbol or as a section relative
-// offset
-unsigned ARMELFObjectWriter::GetRelocType(const MCValue &Target,
-                                          const MCFixup &Fixup,
-                                          bool IsPCRel,
-                                          bool IsRelocWithSymbol,
-                                          int64_t Addend) const {
-  return GetRelocTypeInner(Target, Fixup, IsPCRel);
-}
-
-unsigned ARMELFObjectWriter::GetRelocTypeInner(const MCValue &Target,
-                                               const MCFixup &Fixup,
-                                               bool IsPCRel) const  {
-  MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
-    MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
-
-  unsigned Type = 0;
-  if (IsPCRel) {
-    switch ((unsigned)Fixup.getKind()) {
-    default: assert(0 && "Unimplemented");
-    case FK_Data_4:
-      switch (Modifier) {
-      default: llvm_unreachable("Unsupported Modifier");
-      case MCSymbolRefExpr::VK_None:
-        Type = ELF::R_ARM_REL32;
-        break;
-      case MCSymbolRefExpr::VK_ARM_TLSGD:
-        assert(0 && "unimplemented");
-        break;
-      case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
-        Type = ELF::R_ARM_TLS_IE32;
-        break;
-      }
-      break;
-    case ARM::fixup_arm_uncondbranch:
-      switch (Modifier) {
-      case MCSymbolRefExpr::VK_ARM_PLT:
-        Type = ELF::R_ARM_PLT32;
-        break;
-      default:
-        Type = ELF::R_ARM_CALL;
-        break;
-      }
-      break;
-    case ARM::fixup_arm_condbranch:
-      Type = ELF::R_ARM_JUMP24;
-      break;
-    case ARM::fixup_arm_movt_hi16:
-    case ARM::fixup_arm_movt_hi16_pcrel:
-      Type = ELF::R_ARM_MOVT_PREL;
-      break;
-    case ARM::fixup_arm_movw_lo16:
-    case ARM::fixup_arm_movw_lo16_pcrel:
-      Type = ELF::R_ARM_MOVW_PREL_NC;
-      break;
-    case ARM::fixup_t2_movt_hi16:
-    case ARM::fixup_t2_movt_hi16_pcrel:
-      Type = ELF::R_ARM_THM_MOVT_PREL;
-      break;
-    case ARM::fixup_t2_movw_lo16:
-    case ARM::fixup_t2_movw_lo16_pcrel:
-      Type = ELF::R_ARM_THM_MOVW_PREL_NC;
-      break;
-    case ARM::fixup_arm_thumb_bl:
-    case ARM::fixup_arm_thumb_blx:
-      switch (Modifier) {
-      case MCSymbolRefExpr::VK_ARM_PLT:
-        Type = ELF::R_ARM_THM_CALL;
-        break;
-      default:
-        Type = ELF::R_ARM_NONE;
-        break;
-      }
-      break;
-    }
-  } else {
-    switch ((unsigned)Fixup.getKind()) {
-    default: llvm_unreachable("invalid fixup kind!");
-    case FK_Data_4:
-      switch (Modifier) {
-      default: llvm_unreachable("Unsupported Modifier"); break;
-      case MCSymbolRefExpr::VK_ARM_GOT:
-        Type = ELF::R_ARM_GOT_BREL;
-        break;
-      case MCSymbolRefExpr::VK_ARM_TLSGD:
-        Type = ELF::R_ARM_TLS_GD32;
-        break;
-      case MCSymbolRefExpr::VK_ARM_TPOFF:
-        Type = ELF::R_ARM_TLS_LE32;
-        break;
-      case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
-        Type = ELF::R_ARM_TLS_IE32;
-        break;
-      case MCSymbolRefExpr::VK_None:
-        Type = ELF::R_ARM_ABS32;
-        break;
-      case MCSymbolRefExpr::VK_ARM_GOTOFF:
-        Type = ELF::R_ARM_GOTOFF32;
-        break;
-      }
-      break;
-    case ARM::fixup_arm_ldst_pcrel_12:
-    case ARM::fixup_arm_pcrel_10:
-    case ARM::fixup_arm_adr_pcrel_12:
-    case ARM::fixup_arm_thumb_bl:
-    case ARM::fixup_arm_thumb_cb:
-    case ARM::fixup_arm_thumb_cp:
-    case ARM::fixup_arm_thumb_br:
-      assert(0 && "Unimplemented");
-      break;
-    case ARM::fixup_arm_uncondbranch:
-      Type = ELF::R_ARM_CALL;
-      break;
-    case ARM::fixup_arm_condbranch:
-      Type = ELF::R_ARM_JUMP24;
-      break;
-    case ARM::fixup_arm_movt_hi16:
-      Type = ELF::R_ARM_MOVT_ABS;
-      break;
-    case ARM::fixup_arm_movw_lo16:
-      Type = ELF::R_ARM_MOVW_ABS_NC;
-      break;
-    case ARM::fixup_t2_movt_hi16:
-      Type = ELF::R_ARM_THM_MOVT_ABS;
-      break;
-    case ARM::fixup_t2_movw_lo16:
-      Type = ELF::R_ARM_THM_MOVW_ABS_NC;
-      break;
-    }
-  }
-
-  return Type;
-}
-
 //===- PPCELFObjectWriter -------------------------------------------===//
 
 PPCELFObjectWriter::PPCELFObjectWriter(MCELFObjectTargetWriter *MOTW,
diff --git a/lib/MC/ELFObjectWriter.h b/lib/MC/ELFObjectWriter.h
index 59734e8..71140f1 100644
--- a/lib/MC/ELFObjectWriter.h
+++ b/lib/MC/ELFObjectWriter.h
@@ -152,7 +152,7 @@ class ELFObjectWriter : public MCObjectWriter {
                                            const MCFragment &F,
                                            const MCFixup &Fixup,
                                            bool IsPCRel) const {
-      return NULL;
+      return TargetObjectWriter->ExplicitRelSym(Asm, Target, F, Fixup, IsPCRel);
     }
 
     bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
@@ -243,8 +243,9 @@ class ELFObjectWriter : public MCObjectWriter {
     virtual void WriteHeader(uint64_t SectionDataSize,
                              unsigned NumberOfSections);
 
-    /// Default e_flags = 0
-    virtual unsigned getEFlags() const { return 0; }
+    virtual unsigned getEFlags() const {
+      return TargetObjectWriter->getEFlags();
+    }
 
     virtual void WriteSymbolEntry(MCDataFragment *SymtabF,
                                   MCDataFragment *ShndxF,
@@ -356,35 +357,6 @@ class ELFObjectWriter : public MCObjectWriter {
                                    uint64_t &RelocOffset) {}
   };
 
-  //===- ARMELFObjectWriter -------------------------------------------===//
-
-  class ARMELFObjectWriter : public ELFObjectWriter {
-  public:
-    // FIXME: MCAssembler can't yet return the Subtarget,
-    enum { DefaultEABIVersion = 0x05000000U };
-
-    ARMELFObjectWriter(MCELFObjectTargetWriter *MOTW,
-                       raw_ostream &_OS,
-                       bool IsLittleEndian);
-
-    virtual ~ARMELFObjectWriter();
-
-    virtual unsigned getEFlags() const;
-  protected:
-    virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm,
-                                           const MCValue &Target,
-                                           const MCFragment &F,
-                                           const MCFixup &Fixup,
-                                           bool IsPCRel) const;
-
-    virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
-                                  bool IsPCRel, bool IsRelocWithSymbol,
-                                  int64_t Addend) const;
-  private:
-    unsigned GetRelocTypeInner(const MCValue &Target,
-                               const MCFixup &Fixup, bool IsPCRel) const;
-  };
-
   //===- PPCELFObjectWriter -------------------------------------------===//
 
   class PPCELFObjectWriter : public ELFObjectWriter {
diff --git a/lib/MC/MCELFObjectTargetWriter.cpp b/lib/MC/MCELFObjectTargetWriter.cpp
index 5143517..055f2c2 100644
--- a/lib/MC/MCELFObjectTargetWriter.cpp
+++ b/lib/MC/MCELFObjectTargetWriter.cpp
@@ -19,6 +19,20 @@ MCELFObjectTargetWriter::MCELFObjectTargetWriter(bool Is64Bit_,
     HasRelocationAddend(HasRelocationAddend_), Is64Bit(Is64Bit_) {
 }
 
+/// Default e_flags = 0
+unsigned MCELFObjectTargetWriter::getEFlags() const {
+  return 0;
+}
+
+const MCSymbol *MCELFObjectTargetWriter::ExplicitRelSym(const MCAssembler &Asm,
+                                                        const MCValue &Target,
+                                                        const MCFragment &F,
+                                                        const MCFixup &Fixup,
+                                                        bool IsPCRel) const {
+  return NULL;
+}
+
+
 unsigned MCELFObjectTargetWriter::GetRelocType(const MCValue &Target,
                                                const MCFixup &Fixup,
                                                bool IsPCRel,