Vendor import of llvm trunk r132879:

http://llvm.org/svn/llvm-project/llvm/trunk@132879

1 files changed, 93 insertions, 0 deletions

diff --git a/include/llvm/MC/MCWin64EH.h b/include/llvm/MC/MCWin64EH.h
new file mode 100644
index 0000000..eb4665a
--- /dev/null
+++ b/include/llvm/MC/MCWin64EH.h
@@ -0,0 +1,93 @@
+//===- MCWin64EH.h - Machine Code Win64 EH support --------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains declarations to support the Win64 Exception Handling
+// scheme in MC.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCWIN64EH_H
+#define LLVM_MC_MCWIN64EH_H
+
+#include "llvm/Support/Win64EH.h"
+#include <cassert>
+#include <vector>
+
+namespace llvm {
+  class StringRef;
+  class MCStreamer;
+  class MCSymbol;
+
+  class MCWin64EHInstruction {
+  public:
+    typedef Win64EH::UnwindOpcodes OpType;
+  private:
+    OpType Operation;
+    MCSymbol *Label;
+    unsigned Offset;
+    unsigned Register;
+  public:
+    MCWin64EHInstruction(OpType Op, MCSymbol *L, unsigned Reg)
+      : Operation(Op), Label(L), Offset(0), Register(Reg) {
+     assert(Op == Win64EH::UOP_PushNonVol);
+    }
+    MCWin64EHInstruction(MCSymbol *L, unsigned Size)
+      : Operation(Size>128 ? Win64EH::UOP_AllocLarge : Win64EH::UOP_AllocSmall),
+        Label(L), Offset(Size) { }
+    MCWin64EHInstruction(OpType Op, MCSymbol *L, unsigned Reg, unsigned Off)
+      : Operation(Op), Label(L), Offset(Off), Register(Reg) {
+      assert(Op == Win64EH::UOP_SetFPReg ||
+             Op == Win64EH::UOP_SaveNonVol ||
+             Op == Win64EH::UOP_SaveNonVolBig ||
+             Op == Win64EH::UOP_SaveXMM128 ||
+             Op == Win64EH::UOP_SaveXMM128Big);
+    }
+    MCWin64EHInstruction(OpType Op, MCSymbol *L, bool Code)
+      : Operation(Op), Label(L), Offset(Code ? 1 : 0) {
+      assert(Op == Win64EH::UOP_PushMachFrame);
+    }
+    OpType getOperation() const { return Operation; }
+    MCSymbol *getLabel() const { return Label; }
+    unsigned getOffset() const { return Offset; }
+    unsigned getSize() const { return Offset; }
+    unsigned getRegister() const { return Register; }
+    bool isPushCodeFrame() const { return Offset == 1; }
+  };
+
+  struct MCWin64EHUnwindInfo {
+    MCWin64EHUnwindInfo() : Begin(0), End(0), ExceptionHandler(0),
+                            Function(0), PrologEnd(0), Symbol(0),
+                            HandlesUnwind(false), HandlesExceptions(false),
+                            LastFrameInst(-1), ChainedParent(0),
+                            Instructions() {}
+    MCSymbol *Begin;
+    MCSymbol *End;
+    const MCSymbol *ExceptionHandler;
+    const MCSymbol *Function;
+    MCSymbol *PrologEnd;
+    MCSymbol *Symbol;
+    bool HandlesUnwind;
+    bool HandlesExceptions;
+    int LastFrameInst;
+    MCWin64EHUnwindInfo *ChainedParent;
+    std::vector<MCWin64EHInstruction> Instructions;
+  };
+
+  class MCWin64EHUnwindEmitter {
+  public:
+    static StringRef GetSectionSuffix(const MCSymbol *func);
+    //
+    // This emits the unwind info sections (.pdata and .xdata in PE/COFF).
+    //
+    static void Emit(MCStreamer &streamer);
+    static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info);
+  };
+} // end namespace llvm
+
+#endif