Split MCELFStreamer into a header file.

[oota-llvm.git] / include / llvm / MC / MCELFObjectWriter.h

diff --git a/include/llvm/MC/MCELFObjectWriter.h b/include/llvm/MC/MCELFObjectWriter.h
index a5555e38e049f9e29897234776c4a75f35b8d051..38cdc7293ba01829a4632c0d3827596a00516a60 100644 (file)
--- a/include/llvm/MC/MCELFObjectWriter.h
+++ b/include/llvm/MC/MCELFObjectWriter.h
@@ -10,16 +10,137 @@
 #ifndef LLVM_MC_MCELFOBJECTWRITER_H
 #define LLVM_MC_MCELFOBJECTWRITER_H
 
-#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/ADT/Triple.h"
 #include "llvm/Support/DataTypes.h"
+#include "llvm/Support/ELF.h"
+#include <vector>
 
 namespace llvm {
+class MCAssembler;
+class MCFixup;
+class MCFragment;
+class MCObjectWriter;
+class MCSymbol;
+class MCValue;
+
+/// @name Relocation Data
+/// @{
+
+struct ELFRelocationEntry {
+  // Make these big enough for both 32-bit and 64-bit
+  uint64_t r_offset;
+  int Index;
+  unsigned Type;
+  const MCSymbol *Symbol;
+  uint64_t r_addend;
+  const MCFixup *Fixup;
+
+  ELFRelocationEntry()
+    : r_offset(0), Index(0), Type(0), Symbol(0), r_addend(0), Fixup(0) {}
+
+  ELFRelocationEntry(uint64_t RelocOffset, int Idx, unsigned RelType,
+                     const MCSymbol *Sym, uint64_t Addend, const MCFixup &Fixup)
+    : r_offset(RelocOffset), Index(Idx), Type(RelType), Symbol(Sym),
+      r_addend(Addend), Fixup(&Fixup) {}
+
+  // Support lexicographic sorting.
+  bool operator<(const ELFRelocationEntry &RE) const {
+    return RE.r_offset < r_offset;
+  }
+};
+
 class MCELFObjectTargetWriter {
+  const uint8_t OSABI;
+  const uint16_t EMachine;
+  const unsigned HasRelocationAddend : 1;
+  const unsigned Is64Bit : 1;
+  const unsigned IsN64 : 1;
+
 protected:
-  MCELFObjectTargetWriter();
+
+  MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_,
+                          uint16_t EMachine_,  bool HasRelocationAddend,
+                          bool IsN64=false);
 
 public:
-  virtual ~MCELFObjectTargetWriter();
+  static uint8_t getOSABI(Triple::OSType OSType) {
+    switch (OSType) {
+      case Triple::FreeBSD:
+        return ELF::ELFOSABI_FREEBSD;
+      case Triple::Linux:
+        return ELF::ELFOSABI_LINUX;
+      default:
+        return ELF::ELFOSABI_NONE;
+    }
+  }
+
+  virtual ~MCELFObjectTargetWriter() {}
+
+  virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
+                                bool IsPCRel, bool IsRelocWithSymbol,
+                                int64_t Addend) const = 0;
+  virtual unsigned getEFlags() const;
+  virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm,
+                                         const MCValue &Target,
+                                         const MCFragment &F,
+                                         const MCFixup &Fixup,
+                                         bool IsPCRel) const;
+  virtual const MCSymbol *undefinedExplicitRelSym(const MCValue &Target,
+                                                  const MCFixup &Fixup,
+                                                  bool IsPCRel) const;
+  virtual void adjustFixupOffset(const MCFixup &Fixup,
+                                 uint64_t &RelocOffset);
+
+  virtual void sortRelocs(const MCAssembler &Asm,
+                          std::vector<ELFRelocationEntry> &Relocs);
+
+  /// @name Accessors
+  /// @{
+  uint8_t getOSABI() const { return OSABI; }
+  uint16_t getEMachine() const { return EMachine; }
+  bool hasRelocationAddend() const { return HasRelocationAddend; }
+  bool is64Bit() const { return Is64Bit; }
+  bool isN64() const { return IsN64; }
+  /// @}
+
+  // Instead of changing everyone's API we pack the N64 Type fields
+  // into the existing 32 bit data unsigned.
+#define R_TYPE_SHIFT 0
+#define R_TYPE_MASK 0xffffff00
+#define R_TYPE2_SHIFT 8
+#define R_TYPE2_MASK 0xffff00ff
+#define R_TYPE3_SHIFT 16
+#define R_TYPE3_MASK 0xff00ffff
+#define R_SSYM_SHIFT 24
+#define R_SSYM_MASK 0x00ffffff
+
+  // N64 relocation type accessors
+  unsigned getRType(uint32_t Type) const {
+    return (unsigned)((Type >> R_TYPE_SHIFT) & 0xff);
+  }
+  unsigned getRType2(uint32_t Type) const {
+    return (unsigned)((Type >> R_TYPE2_SHIFT) & 0xff);
+  }
+  unsigned getRType3(uint32_t Type) const {
+    return (unsigned)((Type >> R_TYPE3_SHIFT) & 0xff);
+  }
+  unsigned getRSsym(uint32_t Type) const {
+    return (unsigned)((Type >> R_SSYM_SHIFT) & 0xff);
+  }
+
+  // N64 relocation type setting
+  unsigned setRType(unsigned Value, unsigned Type) const {
+    return ((Type & R_TYPE_MASK) | ((Value & 0xff) << R_TYPE_SHIFT));
+  }
+  unsigned setRType2(unsigned Value, unsigned Type) const {
+    return (Type & R_TYPE2_MASK) | ((Value & 0xff) << R_TYPE2_SHIFT);
+  }
+  unsigned setRType3(unsigned Value, unsigned Type) const {
+    return (Type & R_TYPE3_MASK) | ((Value & 0xff) << R_TYPE3_SHIFT);
+  }
+  unsigned setRSsym(unsigned Value, unsigned Type) const {
+    return (Type & R_SSYM_MASK) | ((Value & 0xff) << R_SSYM_SHIFT);
+  }
 };
 
 /// \brief Construct a new ELF writer instance.
@@ -28,10 +149,7 @@ public:
 /// \param OS - The stream to write to.
 /// \returns The constructed object writer.
 MCObjectWriter *createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
-                                      raw_ostream &OS, bool is64Bit,
-                                      Triple::OSType OSType, uint16_t EMachine,
-                                      bool IsLittleEndian,
-                                      bool HasRelocationAddend);
+                                      raw_ostream &OS, bool IsLittleEndian);
 } // End llvm namespace
 
 #endif