X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FMC%2FMCELFObjectWriter.h;h=01f694d3b75639b3ae575a07dc677f3c694e8860;hb=00552e3875ee5f382db6c98286a241a7d0efe1b8;hp=2a82ec197fa9f16cb66bee2e394fd4d37c2de38e;hpb=285b3e5b61af15f11e59a7700375aefa2a326bd8;p=oota-llvm.git

diff --git a/include/llvm/MC/MCELFObjectWriter.h b/include/llvm/MC/MCELFObjectWriter.h
index 2a82ec197fa..01f694d3b75 100644
--- a/include/llvm/MC/MCELFObjectWriter.h
+++ b/include/llvm/MC/MCELFObjectWriter.h
@@ -10,18 +10,128 @@
 #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 MCSymbolELF;
+class MCValue;
+class raw_pwrite_stream;
+
+struct ELFRelocationEntry {
+  uint64_t Offset; // Where is the relocation.
+  const MCSymbolELF *Symbol; // The symbol to relocate with.
+  unsigned Type;   // The type of the relocation.
+  uint64_t Addend; // The addend to use.
+
+  ELFRelocationEntry(uint64_t Offset, const MCSymbolELF *Symbol, unsigned Type,
+                     uint64_t Addend)
+      : Offset(Offset), Symbol(Symbol), Type(Type), Addend(Addend) {}
+};
+
+class MCELFObjectTargetWriter {
+  const uint8_t OSABI;
+  const uint16_t EMachine;
+  const unsigned HasRelocationAddend : 1;
+  const unsigned Is64Bit : 1;
+  const unsigned IsN64 : 1;
+
+protected:
+
+  MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_,
+                          uint16_t EMachine_,  bool HasRelocationAddend,
+                          bool IsN64=false);
+
+public:
+  static uint8_t getOSABI(Triple::OSType OSType) {
+    switch (OSType) {
+      case Triple::CloudABI:
+        return ELF::ELFOSABI_CLOUDABI;
+      case Triple::PS4:
+      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) const = 0;
+
+  virtual bool needsRelocateWithSymbol(const MCSymbol &Sym,
+                                       unsigned Type) const;
+
+  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
+  uint8_t getRType(uint32_t Type) const {
+    return (unsigned)((Type >> R_TYPE_SHIFT) & 0xff);
+  }
+  uint8_t getRType2(uint32_t Type) const {
+    return (unsigned)((Type >> R_TYPE2_SHIFT) & 0xff);
+  }
+  uint8_t getRType3(uint32_t Type) const {
+    return (unsigned)((Type >> R_TYPE3_SHIFT) & 0xff);
+  }
+  uint8_t 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.
 ///
+/// \param MOTW - The target specific ELF writer subclass.
 /// \param OS - The stream to write to.
 /// \returns The constructed object writer.
-MCObjectWriter *createELFObjectWriter(raw_ostream &OS, bool is64Bit,
-                                      Triple::OSType OSType, uint16_t EMachine,
-                                      bool IsLittleEndian,
-                                      bool HasRelocationAddend);
+MCObjectWriter *createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
+                                      raw_pwrite_stream &OS,
+                                      bool IsLittleEndian);
 } // End llvm namespace
 
 #endif