[MC] Have MCObjectStreamer take its MCAsmBackend argument via unique_ptr.

MCObjectStreamer owns its MCAsmBackend -- this fixes the types to reflect that,
and allows us to remove another instance of MCObjectStreamer's weird "holding
ownership via someone else's reference" trick.

llvm-svn: 315410

1 files changed, 8 insertions, 2 deletions

diff --git a/llvm/lib/MC/MCELFStreamer.cpp b/llvm/lib/MC/MCELFStreamer.cpp
index 76976cab466..4fdbcd7511c 100644
--- a/llvm/lib/MC/MCELFStreamer.cpp
+++ b/llvm/lib/MC/MCELFStreamer.cpp
@@ -39,6 +39,11 @@
 
 using namespace llvm;
 
+MCELFStreamer::MCELFStreamer(MCContext &Context,
+                             std::unique_ptr<MCAsmBackend> TAB,
+                             raw_pwrite_stream &OS, MCCodeEmitter *Emitter)
+    : MCObjectStreamer(Context, std::move(TAB), OS, Emitter) {}
+
 bool MCELFStreamer::isBundleLocked() const {
   return getCurrentSectionOnly()->isBundleLocked();
 }
@@ -639,10 +644,11 @@ void MCELFStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
   llvm_unreachable("ELF doesn't support this directive");
 }
 
-MCStreamer *llvm::createELFStreamer(MCContext &Context, MCAsmBackend &MAB,
+MCStreamer *llvm::createELFStreamer(MCContext &Context,
+                                    std::unique_ptr<MCAsmBackend> &&MAB,
                                     raw_pwrite_stream &OS, MCCodeEmitter *CE,
                                     bool RelaxAll) {
-  MCELFStreamer *S = new MCELFStreamer(Context, MAB, OS, CE);
+  MCELFStreamer *S = new MCELFStreamer(Context, std::move(MAB), OS, CE);
   if (RelaxAll)
     S->getAssembler().setRelaxAll(true);
   return S;