Merge with LLVM upstream 2011/10/20 (r142530)

Conflicts:
	lib/Support/Unix/Host.inc

Change-Id: Idc00db3b63912dca6348bddd9f8a1af2a8d5d147

1 files changed, 117 insertions, 0 deletions

diff --git a/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp b/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
new file mode 100644
index 0000000..f190ec4
--- /dev/null
+++ b/lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp
@@ -0,0 +1,117 @@
+#include "MCTargetDesc/MipsMCTargetDesc.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCDirectives.h"
+#include "llvm/MC/MCELFObjectWriter.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCMachObjectWriter.h"
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Object/MachOFormat.h"
+#include "llvm/Support/ELF.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+namespace {
+class MipsELFObjectWriter : public MCELFObjectTargetWriter {
+public:
+  MipsELFObjectWriter(bool is64Bit, Triple::OSType OSType, uint16_t EMachine,
+                      bool HasRelocationAddend)
+    : MCELFObjectTargetWriter(is64Bit, OSType, EMachine,
+                              HasRelocationAddend) {}
+};
+
+class MipsAsmBackend : public MCAsmBackend {
+public:
+  MipsAsmBackend(const Target &T)
+    : MCAsmBackend() {}
+
+  unsigned getNumFixupKinds() const {
+    return 1;   //tbd
+  }
+
+  /// ApplyFixup - Apply the \arg Value for given \arg Fixup into the provided
+  /// data fragment, at the offset specified by the fixup and following the
+  /// fixup kind as appropriate.
+  void ApplyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
+                  uint64_t Value) const {
+  }
+
+  /// @name Target Relaxation Interfaces
+  /// @{
+
+  /// MayNeedRelaxation - Check whether the given instruction may need
+  /// relaxation.
+  ///
+  /// \param Inst - The instruction to test.
+  bool MayNeedRelaxation(const MCInst &Inst) const {
+    return false;
+  }
+
+  /// RelaxInstruction - Relax the instruction in the given fragment to the next
+  /// wider instruction.
+  ///
+  /// \param Inst - The instruction to relax, which may be the same as the
+  /// output.
+  /// \parm Res [output] - On return, the relaxed instruction.
+  void RelaxInstruction(const MCInst &Inst, MCInst &Res) const {
+  }
+  
+  /// @}
+
+  /// WriteNopData - Write an (optimal) nop sequence of Count bytes to the given
+  /// output. If the target cannot generate such a sequence, it should return an
+  /// error.
+  ///
+  /// \return - True on success.
+  bool WriteNopData(uint64_t Count, MCObjectWriter *OW) const {
+    return false;
+  }
+};
+
+class MipsEB_AsmBackend : public MipsAsmBackend {
+public:
+  Triple::OSType OSType;
+
+  MipsEB_AsmBackend(const Target &T, Triple::OSType _OSType)
+    : MipsAsmBackend(T), OSType(_OSType) {}
+
+  MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
+    return createELFObjectWriter(createELFObjectTargetWriter(),
+                                 OS, /*IsLittleEndian*/ false);
+  }
+
+  MCELFObjectTargetWriter *createELFObjectTargetWriter() const {
+    return new MipsELFObjectWriter(false, OSType, ELF::EM_MIPS, false);
+  }
+};
+
+class MipsEL_AsmBackend : public MipsAsmBackend {
+public:
+  Triple::OSType OSType;
+
+  MipsEL_AsmBackend(const Target &T, Triple::OSType _OSType)
+    : MipsAsmBackend(T), OSType(_OSType) {}
+
+  MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
+    return createELFObjectWriter(createELFObjectTargetWriter(),
+                                 OS, /*IsLittleEndian*/ true);
+  }
+
+  MCELFObjectTargetWriter *createELFObjectTargetWriter() const {
+    return new MipsELFObjectWriter(false, OSType, ELF::EM_MIPS, false);
+  }
+};
+}
+
+MCAsmBackend *llvm::createMipsAsmBackend(const Target &T, StringRef TT) {
+  Triple TheTriple(TT);
+
+  // just return little endian for now
+  //
+  return new MipsEL_AsmBackend(T, Triple(TT).getOS());
+}