vendor/llvm/llvm-trunk-r366426

1 files changed, 35 insertions, 5 deletions

diff --git a/lib/Support/BinaryStreamReader.cpp b/lib/Support/BinaryStreamReader.cpp
index e00527f2519e..b17786593bde 100644
--- a/lib/Support/BinaryStreamReader.cpp
+++ b/lib/Support/BinaryStreamReader.cpp
@@ -1,9 +1,8 @@
 //===- BinaryStreamReader.cpp - Reads objects from a binary stream --------===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -11,6 +10,7 @@
 
 #include "llvm/Support/BinaryStreamError.h"
 #include "llvm/Support/BinaryStreamRef.h"
+#include "llvm/Support/LEB128.h"
 
 using namespace llvm;
 using endianness = llvm::support::endianness;
@@ -41,6 +41,36 @@ Error BinaryStreamReader::readBytes(ArrayRef<uint8_t> &Buffer, uint32_t Size) {
   return Error::success();
 }
 
+Error BinaryStreamReader::readULEB128(uint64_t &Dest) {
+  SmallVector<uint8_t, 10> EncodedBytes;
+  ArrayRef<uint8_t> NextByte;
+
+  // Copy the encoded ULEB into the buffer.
+  do {
+    if (auto Err = readBytes(NextByte, 1))
+      return Err;
+    EncodedBytes.push_back(NextByte[0]);
+  } while (NextByte[0] & 0x80);
+
+  Dest = decodeULEB128(EncodedBytes.begin(), nullptr, EncodedBytes.end());
+  return Error::success();
+}
+
+Error BinaryStreamReader::readSLEB128(int64_t &Dest) {
+  SmallVector<uint8_t, 10> EncodedBytes;
+  ArrayRef<uint8_t> NextByte;
+
+  // Copy the encoded ULEB into the buffer.
+  do {
+    if (auto Err = readBytes(NextByte, 1))
+      return Err;
+    EncodedBytes.push_back(NextByte[0]);
+  } while (NextByte[0] & 0x80);
+
+  Dest = decodeSLEB128(EncodedBytes.begin(), nullptr, EncodedBytes.end());
+  return Error::success();
+}
+
 Error BinaryStreamReader::readCString(StringRef &Dest) {
   uint32_t OriginalOffset = getOffset();
   uint32_t FoundOffset = 0;
@@ -146,4 +176,4 @@ BinaryStreamReader::split(uint32_t Off) const {
   BinaryStreamReader W1{First};
   BinaryStreamReader W2{Second};
   return std::make_pair(W1, W2);
-}
\ No newline at end of file
+}