--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/Object/RecordStreamer.cpp	Mon Sep 08 22:06:00 2014 +0900
@@ -0,0 +1,100 @@
+//===-- RecordStreamer.cpp - Record asm definde and used symbols ----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "RecordStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+using namespace llvm;
+
+void RecordStreamer::markDefined(const MCSymbol &Symbol) {
+  State &S = Symbols[Symbol.getName()];
+  switch (S) {
+  case DefinedGlobal:
+  case Global:
+    S = DefinedGlobal;
+    break;
+  case NeverSeen:
+  case Defined:
+  case Used:
+    S = Defined;
+    break;
+  }
+}
+
+void RecordStreamer::markGlobal(const MCSymbol &Symbol) {
+  State &S = Symbols[Symbol.getName()];
+  switch (S) {
+  case DefinedGlobal:
+  case Defined:
+    S = DefinedGlobal;
+    break;
+
+  case NeverSeen:
+  case Global:
+  case Used:
+    S = Global;
+    break;
+  }
+}
+
+void RecordStreamer::markUsed(const MCSymbol &Symbol) {
+  State &S = Symbols[Symbol.getName()];
+  switch (S) {
+  case DefinedGlobal:
+  case Defined:
+  case Global:
+    break;
+
+  case NeverSeen:
+  case Used:
+    S = Used;
+    break;
+  }
+}
+
+void RecordStreamer::visitUsedSymbol(const MCSymbol &Sym) { markUsed(Sym); }
+
+RecordStreamer::const_iterator RecordStreamer::begin() {
+  return Symbols.begin();
+}
+
+RecordStreamer::const_iterator RecordStreamer::end() { return Symbols.end(); }
+
+RecordStreamer::RecordStreamer(MCContext &Context) : MCStreamer(Context) {}
+
+void RecordStreamer::EmitInstruction(const MCInst &Inst,
+                                     const MCSubtargetInfo &STI) {
+  MCStreamer::EmitInstruction(Inst, STI);
+}
+
+void RecordStreamer::EmitLabel(MCSymbol *Symbol) {
+  MCStreamer::EmitLabel(Symbol);
+  markDefined(*Symbol);
+}
+
+void RecordStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
+  markDefined(*Symbol);
+  MCStreamer::EmitAssignment(Symbol, Value);
+}
+
+bool RecordStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
+                                         MCSymbolAttr Attribute) {
+  if (Attribute == MCSA_Global)
+    markGlobal(*Symbol);
+  return true;
+}
+
+void RecordStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
+                                  uint64_t Size, unsigned ByteAlignment) {
+  markDefined(*Symbol);
+}
+
+void RecordStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+                                      unsigned ByteAlignment) {
+  markDefined(*Symbol);
+}