Add MCELFObjectTargetWriter and MCAsmBackend classes.

Patch by Reed Kotler at Mips Technologies.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140885 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/MCTargetDesc/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_llvm_library(LLVMMipsDesc
+  MipsAsmBackend.cpp
   MipsMCAsmInfo.cpp
   MipsMCCodeEmitter.cpp
   MipsMCTargetDesc.cpp

lib/Target/Mips/MCTargetDesc/MipsAsmBackend.cpp

@@ -0,0 +1,71 @@
+#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
+  }
+};
+
+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);
+  }
+};
+}