1 files changed, 33 insertions, 0 deletions
diff --git a/src/inc/cfi.h b/src/inc/cfi.h
new file mode 100644
index 0000000000..d5d77840ec
--- /dev/null
+++ b/src/inc/cfi.h
@@ -0,0 +1,33 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+#ifndef CFI_H_
+#define CFI_H_
+
+#define DWARF_REG_ILLEGAL -1
+enum CFI_OPCODE
+{
+   CFI_ADJUST_CFA_OFFSET,    // Offset is adjusted relative to the current one.
+   CFI_DEF_CFA_REGISTER,     // New register is used to compute CFA
+   CFI_REL_OFFSET            // Register is saved at offset from the current CFA
+};
+
+struct CFI_CODE
+{
+    unsigned char CodeOffset;// Offset from the start of code the frame covers.
+    unsigned char CfiOpCode;
+    short DwarfReg;          // Dwarf register number. 0~32 for x64.
+    int Offset;
+    CFI_CODE(unsigned char codeOffset, unsigned char cfiOpcode,
+        short dwarfReg, int offset)
+        : CodeOffset(codeOffset)
+        , CfiOpCode(cfiOpcode)
+        , DwarfReg(dwarfReg)
+        , Offset(offset)
+    {}
+};
+typedef CFI_CODE* PCFI_CODE;
+
+#endif // CFI_H
+