1 files changed, 84 insertions, 0 deletions
diff --git a/include/llvm/MC/MCWinEH.h b/include/llvm/MC/MCWinEH.h
new file mode 100644
index 0000000..05b58c7
--- /dev/null
+++ b/include/llvm/MC/MCWinEH.h
@@ -0,0 +1,84 @@
+//===- MCWinEH.h - Windows Unwinding Support --------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#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 {
+  const MCSymbol *Label;
+  const unsigned Offset;
+  const unsigned Register;
+  const unsigned Operation;
+
+  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;
+};
+}
+}
+
+#endif