--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/CodeGen/AsmPrinter/DwarfCFIException.cpp	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,156 @@
+//===-- CodeGen/AsmPrinter/DwarfException.cpp - Dwarf Exception Impl ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing DWARF exception info into asm files.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DwarfException.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Module.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MachineLocation.h"
+#include "llvm/Support/Dwarf.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetFrameLowering.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+using namespace llvm;
+
+DwarfCFIException::DwarfCFIException(AsmPrinter *A)
+  : DwarfException(A),
+    shouldEmitPersonality(false), shouldEmitLSDA(false), shouldEmitMoves(false),
+    moveTypeModule(AsmPrinter::CFI_M_None) {}
+
+DwarfCFIException::~DwarfCFIException() {}
+
+/// EndModule - Emit all exception information that should come after the
+/// content.
+void DwarfCFIException::EndModule() {
+  if (moveTypeModule == AsmPrinter::CFI_M_Debug)
+    Asm->OutStreamer.EmitCFISections(false, true);
+
+  if (!Asm->MAI->isExceptionHandlingDwarf())
+    return;
+
+  const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+
+  unsigned PerEncoding = TLOF.getPersonalityEncoding();
+
+  if ((PerEncoding & 0x70) != dwarf::DW_EH_PE_pcrel)
+    return;
+
+  // Emit references to all used personality functions
+  bool AtLeastOne = false;
+  const std::vector<const Function*> &Personalities = MMI->getPersonalities();
+  for (size_t i = 0, e = Personalities.size(); i != e; ++i) {
+    if (!Personalities[i])
+      continue;
+    MCSymbol *Sym = Asm->getSymbol(Personalities[i]);
+    TLOF.emitPersonalityValue(Asm->OutStreamer, Asm->TM, Sym);
+    AtLeastOne = true;
+  }
+
+  if (AtLeastOne && !TLOF.isFunctionEHFrameSymbolPrivate()) {
+    // This is a temporary hack to keep sections in the same order they
+    // were before. This lets us produce bit identical outputs while
+    // transitioning to CFI.
+    Asm->OutStreamer.SwitchSection(
+               const_cast<TargetLoweringObjectFile&>(TLOF).getEHFrameSection());
+  }
+}
+
+/// BeginFunction - Gather pre-function exception information. Assumes it's
+/// being emitted immediately after the function entry point.
+void DwarfCFIException::BeginFunction(const MachineFunction *MF) {
+  shouldEmitMoves = shouldEmitPersonality = shouldEmitLSDA = false;
+
+  // If any landing pads survive, we need an EH table.
+  bool hasLandingPads = !MMI->getLandingPads().empty();
+
+  // See if we need frame move info.
+  AsmPrinter::CFIMoveType MoveType = Asm->needsCFIMoves();
+  if (MoveType == AsmPrinter::CFI_M_EH ||
+      (MoveType == AsmPrinter::CFI_M_Debug &&
+       moveTypeModule == AsmPrinter::CFI_M_None))
+    moveTypeModule = MoveType;
+
+  shouldEmitMoves = MoveType != AsmPrinter::CFI_M_None;
+
+  const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
+  unsigned PerEncoding = TLOF.getPersonalityEncoding();
+  const Function *Per = MMI->getPersonalities()[MMI->getPersonalityIndex()];
+
+  shouldEmitPersonality = hasLandingPads &&
+    PerEncoding != dwarf::DW_EH_PE_omit && Per;
+
+  unsigned LSDAEncoding = TLOF.getLSDAEncoding();
+  shouldEmitLSDA = shouldEmitPersonality &&
+    LSDAEncoding != dwarf::DW_EH_PE_omit;
+
+  if (!shouldEmitPersonality && !shouldEmitMoves)
+    return;
+
+  Asm->OutStreamer.EmitCFIStartProc();
+
+  // Indicate personality routine, if any.
+  if (!shouldEmitPersonality)
+    return;
+
+  const MCSymbol *Sym = TLOF.getCFIPersonalitySymbol(Per, Asm->Mang, MMI);
+  Asm->OutStreamer.EmitCFIPersonality(Sym, PerEncoding);
+
+  Asm->OutStreamer.EmitDebugLabel
+    (Asm->GetTempSymbol("eh_func_begin",
+                        Asm->getFunctionNumber()));
+
+  // Provide LSDA information.
+  if (!shouldEmitLSDA)
+    return;
+
+  Asm->OutStreamer.EmitCFILsda(Asm->GetTempSymbol("exception",
+                                                  Asm->getFunctionNumber()),
+                               LSDAEncoding);
+}
+
+/// EndFunction - Gather and emit post-function exception information.
+///
+void DwarfCFIException::EndFunction() {
+  if (!shouldEmitPersonality && !shouldEmitMoves)
+    return;
+
+  Asm->OutStreamer.EmitCFIEndProc();
+
+  if (!shouldEmitPersonality)
+    return;
+
+  Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("eh_func_end",
+                                                Asm->getFunctionNumber()));
+
+  // Map all labels and get rid of any dead landing pads.
+  MMI->TidyLandingPads();
+
+  EmitExceptionTable();
+}