Move hash computation code into a separate class and file.
No functional change intended.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188028 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DIEHash.h b/lib/CodeGen/AsmPrinter/DIEHash.h
new file mode 100644
index 0000000..b9f811c
--- /dev/null
+++ b/lib/CodeGen/AsmPrinter/DIEHash.h
@@ -0,0 +1,46 @@
+//===-- llvm/CodeGen/DIEHash.h - Dwarf Hashing Framework -------*- 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 support for DWARF4 hashing of DIEs.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/MD5.h"
+
+namespace llvm {
+
+class CompileUnit;
+
+/// \brief An object containing the capability of hashing and adding hash
+/// attributes onto a DIE.
+class DIEHash {
+public:
+ /// \brief Initializes. The hash is default initialized.
+ DIEHash() {}
+
+ /// \brief Computes the ODR signature
+ uint64_t computeDIEODRSignature(DIE *Die);
+
+ // Helper routines to process parts of a DIE.
+ private:
+ /// \brief Adds the parent context of \param Die to the hash.
+ void addParentContext(DIE *Die);
+
+ // Routines that add DIEValues to the hash.
+private:
+ /// \brief Encodes and adds \param Value to the hash as a ULEB128.
+ void addULEB128(uint64_t Value);
+
+ /// \brief Adds \param Str to the hash and includes a NULL byte.
+ void addString(StringRef Str);
+
+private:
+ MD5 Hash;
+};
+}