Add a default implementation of createObjectStreamer.

This removes duplicated code from backends that don't need to do anything
fancy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232658 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/TargetRegistry.h

@@ -58,6 +58,10 @@ namespace llvm {
                                 bool isVerboseAsm, bool useDwarfDirectory,
                                 MCInstPrinter *InstPrint, MCCodeEmitter *CE,
                                 MCAsmBackend *TAB, bool ShowInst);
+  MCStreamer *createObjectStreamer(const Triple &T, MCContext &Ctx,
+                                   MCAsmBackend &TAB, raw_ostream &OS,
+                                   MCCodeEmitter *Emitter,
+                                   const MCSubtargetInfo &STI, bool RelaxAll);
 
   MCRelocationInfo *createMCRelocationInfo(StringRef TT, MCContext &Ctx);
 
@@ -419,7 +423,8 @@ namespace llvm {
                                        const MCSubtargetInfo &STI,
                                        bool RelaxAll) const {
       if (!MCObjectStreamerCtorFn)
-        return nullptr;
+        return llvm::createObjectStreamer(T, Ctx, TAB, OS, Emitter, STI,
+                                          RelaxAll);
       return MCObjectStreamerCtorFn(T, Ctx, TAB, OS, Emitter, STI, RelaxAll);
     }
 

lib/MC/MCObjectStreamer.cpp

@@ -20,6 +20,7 @@
 #include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/TargetRegistry.h"
 using namespace llvm;
 
 MCObjectStreamer::MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
@@ -422,3 +423,16 @@ void MCObjectStreamer::FinishImpl() {
   flushPendingLabels(nullptr);
   getAssembler().Finish();
 }
+
+MCStreamer *llvm::createObjectStreamer(const Triple &T, MCContext &Ctx,
+                                       MCAsmBackend &TAB, raw_ostream &OS,
+                                       MCCodeEmitter *Emitter,
+                                       const MCSubtargetInfo &STI,
+                                       bool RelaxAll) {
+  switch (T.getObjectFormat()) {
+  default:
+    return nullptr;
+  case Triple::ELF:
+    return createELFStreamer(Ctx, TAB, OS, Emitter, RelaxAll);
+  }
+}

lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp

@@ -47,15 +47,6 @@ static MCRegisterInfo *createHexagonMCRegisterInfo(StringRef TT) {
   return X;
 }
 
-static MCStreamer *
-createHexagonELFStreamer(MCContext &Context, MCAsmBackend &MAB,
-                         raw_ostream &OS, MCCodeEmitter *CE,
-                         bool RelaxAll) {
-  MCELFStreamer *ES = new MCELFStreamer(Context, MAB, OS, CE);
-  return ES;
-}
-
-
 static MCSubtargetInfo *
 createHexagonMCSubtargetInfo(StringRef TT, StringRef CPU, StringRef FS) {
   MCSubtargetInfo *X = new MCSubtargetInfo();
@@ -75,16 +66,6 @@ static MCAsmInfo *createHexagonMCAsmInfo(const MCRegisterInfo &MRI,
   return MAI;
 }
 
-static MCStreamer *createMCStreamer(const Triple &T, MCContext &Context,
-                                    MCAsmBackend &MAB, raw_ostream &OS,
-                                    MCCodeEmitter *Emitter,
-                                    MCSubtargetInfo const &STI, bool RelaxAll) {
-  MCStreamer *ES = createHexagonELFStreamer(Context, MAB, OS, Emitter, RelaxAll);
-  new MCTargetStreamer(*ES);
-  return ES;
-}
-
-
 static MCCodeGenInfo *createHexagonMCCodeGenInfo(StringRef TT, Reloc::Model RM,
                                                  CodeModel::Model CM,
                                                  CodeGenOpt::Level OL) {
@@ -135,7 +116,4 @@ extern "C" void LLVMInitializeHexagonTargetMC() {
   // Register the asm backend
   TargetRegistry::RegisterMCAsmBackend(TheHexagonTarget,
                                        createHexagonAsmBackend);
-
-  // Register the obj streamer
-  TargetRegistry::RegisterMCObjectStreamer(TheHexagonTarget, createMCStreamer);
 }

lib/Target/R600/MCTargetDesc/AMDGPUMCTargetDesc.cpp

@@ -73,13 +73,6 @@ static MCInstPrinter *createAMDGPUMCInstPrinter(const Target &T,
   return new AMDGPUInstPrinter(MAI, MII, MRI);
 }
 
-static MCStreamer *createMCStreamer(const Triple &T, MCContext &Ctx,
-                                    MCAsmBackend &MAB, raw_ostream &OS,
-                                    MCCodeEmitter *Emitter,
-                                    const MCSubtargetInfo &STI, bool RelaxAll) {
-  return createELFStreamer(Ctx, MAB, OS, Emitter, false);
-}
-
 extern "C" void LLVMInitializeR600TargetMC() {
 
   RegisterMCAsmInfo<AMDGPUMCAsmInfo> Y(TheAMDGPUTarget);
@@ -105,7 +98,4 @@ extern "C" void LLVMInitializeR600TargetMC() {
 
   TargetRegistry::RegisterMCAsmBackend(TheAMDGPUTarget, createAMDGPUAsmBackend);
   TargetRegistry::RegisterMCAsmBackend(TheGCNTarget, createAMDGPUAsmBackend);
-
-  TargetRegistry::RegisterMCObjectStreamer(TheAMDGPUTarget, createMCStreamer);
-  TargetRegistry::RegisterMCObjectStreamer(TheGCNTarget, createMCStreamer);
 }

lib/Target/SystemZ/MCTargetDesc/SystemZMCTargetDesc.cpp

@@ -181,12 +181,6 @@ static MCInstPrinter *createSystemZMCInstPrinter(const Target &T,
   return new SystemZInstPrinter(MAI, MII, MRI);
 }
 
-static MCStreamer *createSystemZMCObjectStreamer(
-    const Triple &T, MCContext &Ctx, MCAsmBackend &MAB, raw_ostream &OS,
-    MCCodeEmitter *Emitter, const MCSubtargetInfo &STI, bool RelaxAll) {
-  return createELFStreamer(Ctx, MAB, OS, Emitter, RelaxAll);
-}
-
 extern "C" void LLVMInitializeSystemZTargetMC() {
   // Register the MCAsmInfo.
   TargetRegistry::RegisterMCAsmInfo(TheSystemZTarget,
@@ -219,8 +213,4 @@ extern "C" void LLVMInitializeSystemZTargetMC() {
   // Register the MCInstPrinter.
   TargetRegistry::RegisterMCInstPrinter(TheSystemZTarget,
                                         createSystemZMCInstPrinter);
-
-  // Register the MCObjectStreamer;
-  TargetRegistry::RegisterMCObjectStreamer(TheSystemZTarget,
-                                           createSystemZMCObjectStreamer);
 }