1 files changed, 55 insertions, 0 deletions
diff --git a/include/llvm/MC/MCWinEH.h b/include/llvm/MC/MCWinEH.h
index 1cd1b0f1b8ca..05b58c753b66 100644
--- a/include/llvm/MC/MCWinEH.h
+++ b/include/llvm/MC/MCWinEH.h
@@ -10,8 +10,14 @@
 #ifndef LLVM_MC_MCWINEH_H
 #define LLVM_MC_MCWINEH_H
 
+#include <vector>
+
 namespace llvm {
+class MCContext;
+class MCSection;
+class MCStreamer;
 class MCSymbol;
+class StringRef;
 
 namespace WinEH {
 struct Instruction {
@@ -23,6 +29,55 @@ struct Instruction {
   Instruction(unsigned Op, MCSymbol *L, unsigned Reg, unsigned Off)
     : Label(L), Offset(Off), Register(Reg), Operation(Op) {}
 };
+
+struct FrameInfo {
+  const MCSymbol *Begin;
+  const MCSymbol *End;
+  const MCSymbol *ExceptionHandler;
+  const MCSymbol *Function;
+  const MCSymbol *PrologEnd;
+  const MCSymbol *Symbol;
+
+  bool HandlesUnwind;
+  bool HandlesExceptions;
+
+  int LastFrameInst;
+  const FrameInfo *ChainedParent;
+  std::vector<Instruction> Instructions;
+
+  FrameInfo()
+    : Begin(nullptr), End(nullptr), ExceptionHandler(nullptr),
+      Function(nullptr), PrologEnd(nullptr), Symbol(nullptr),
+      HandlesUnwind(false), HandlesExceptions(false), LastFrameInst(-1),
+      ChainedParent(nullptr), Instructions() {}
+  FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel)
+    : Begin(BeginFuncEHLabel), End(nullptr), ExceptionHandler(nullptr),
+      Function(Function), PrologEnd(nullptr), Symbol(nullptr),
+      HandlesUnwind(false), HandlesExceptions(false), LastFrameInst(-1),
+      ChainedParent(nullptr), Instructions() {}
+  FrameInfo(const MCSymbol *Function, const MCSymbol *BeginFuncEHLabel,
+            const FrameInfo *ChainedParent)
+    : Begin(BeginFuncEHLabel), End(nullptr), ExceptionHandler(nullptr),
+      Function(Function), PrologEnd(nullptr), Symbol(nullptr),
+      HandlesUnwind(false), HandlesExceptions(false), LastFrameInst(-1),
+      ChainedParent(ChainedParent), Instructions() {}
+};
+
+class UnwindEmitter {
+public:
+  static const MCSection *getPDataSection(const MCSymbol *Function,
+                                          MCContext &Context);
+  static const MCSection *getXDataSection(const MCSymbol *Function,
+                                          MCContext &Context);
+
+  virtual ~UnwindEmitter() { }
+
+  //
+  // This emits the unwind info sections (.pdata and .xdata in PE/COFF).
+  //
+  virtual void Emit(MCStreamer &Streamer) const = 0;
+  virtual void EmitUnwindInfo(MCStreamer &Streamer, FrameInfo *FI) const = 0;
+};
 }
 }