2 files changed, 45 insertions, 0 deletions
diff --git a/llvm/lib/Support/CMakeLists.txt b/llvm/lib/Support/CMakeLists.txt
index 5d533dea658..1ba1c76f71f 100644
--- a/llvm/lib/Support/CMakeLists.txt
+++ b/llvm/lib/Support/CMakeLists.txt
@@ -31,6 +31,7 @@ add_llvm_library(LLVMSupport
   IntrusiveRefCntPtr.cpp
   IsInf.cpp
   IsNAN.cpp
+  LEB128.cpp
   LineIterator.cpp
   Locale.cpp
   LockFileManager.cpp
diff --git a/llvm/lib/Support/LEB128.cpp b/llvm/lib/Support/LEB128.cpp
new file mode 100644
index 00000000000..449626f2d45
--- /dev/null
+++ b/llvm/lib/Support/LEB128.cpp
@@ -0,0 +1,44 @@
+//===- LEB128.cpp - LEB128 utility functions implementation -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements some utility functions for encoding SLEB128 and
+// ULEB128 values.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/LEB128.h"
+
+namespace llvm {
+
+/// Utility function to get the size of the ULEB128-encoded value.
+unsigned getULEB128Size(uint64_t Value) {
+  unsigned Size = 0;
+  do {
+    Value >>= 7;
+    Size += sizeof(int8_t);
+  } while (Value);
+  return Size;
+}
+
+/// Utility function to get the size of the SLEB128-encoded value.
+unsigned getSLEB128Size(int64_t Value) {
+  unsigned Size = 0;
+  int Sign = Value >> (8 * sizeof(Value) - 1);
+  bool IsMore;
+
+  do {
+    unsigned Byte = Value & 0x7f;
+    Value >>= 7;
+    IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0;
+    Size += sizeof(int8_t);
+  } while (IsMore);
+  return Size;
+}
+
+}  // namespace llvm