Give the MCStreamer class hierarchy LLVM RTTI facilities for use with

isa<> and dyn_cast<>. In several places, code is already hacking around
the absence of this, and there seem to be several interfaces that might
be lifted and/or devirtualized using this.

This change was based on a discussion with Jim Grosbach about how best
to handle testing for specific MCStreamer subclasses. He said that this
was the correct end state, and everything else was too hacky so
I decided to just make it so.

No functionality should be changed here, this is just threading the kind
through all the constructors and setting up the classof overloads.

llvm-svn: 174113

1 files changed, 9 insertions, 6 deletions

diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
index 526f5712a05..418971df329 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMELFStreamer.cpp
@@ -54,12 +54,11 @@ namespace {
 /// by MachO. Beware!
 class ARMELFStreamer : public MCELFStreamer {
 public:
-  ARMELFStreamer(MCContext &Context, MCAsmBackend &TAB,
-                 raw_ostream &OS, MCCodeEmitter *Emitter, bool IsThumb)
-    : MCELFStreamer(Context, TAB, OS, Emitter),
-      IsThumb(IsThumb), MappingSymbolCounter(0), LastEMS(EMS_None),
-      ExTab(0), FnStart(0), Personality(0), CantUnwind(false) {
-  }
+  ARMELFStreamer(MCContext &Context, MCAsmBackend &TAB, raw_ostream &OS,
+                 MCCodeEmitter *Emitter, bool IsThumb)
+      : MCELFStreamer(SK_ARMELFStreamer, Context, TAB, OS, Emitter),
+        IsThumb(IsThumb), MappingSymbolCounter(0), LastEMS(EMS_None), ExTab(0),
+        FnStart(0), Personality(0), CantUnwind(false) {}
 
   ~ARMELFStreamer() {}
 
@@ -134,6 +133,10 @@ public:
     }
   }
 
+  static bool classof(const MCStreamer *S) {
+    return S->getKind() == SK_ARMELFStreamer;
+  }
+
 private:
   enum ElfMappingSymbol {
     EMS_None,