// int_encoding.h -- variable length and unaligned integers -*- C++ -*-
-// Copyright 2009 Free Software Foundation, Inc.
+// Copyright (C) 2009-2016 Free Software Foundation, Inc.
// Written by Doug Kwan <dougkwan@google.com> by refactoring scattered
// contents from other files in gold. Original code written by Ian
// Lance Taylor <iant@google.com> and Caleb Howe <cshowe@google.com>.
//
// Read a ULEB 128 encoded integer from BUFFER. Return the length of the
-// encoded integer at the location PLEN.
+// encoded integer at the location PLEN. The common case of a single-byte
+// value is handled inline, and multi-byte values are processed by the _x
+// routine, where BYTE is the first byte of the value.
uint64_t
-read_unsigned_LEB_128(const unsigned char* buffer, size_t* plen);
+read_unsigned_LEB_128_x(const unsigned char* buffer, size_t* plen,
+ unsigned char byte);
+
+inline uint64_t
+read_unsigned_LEB_128(const unsigned char* buffer, size_t* plen)
+{
+ unsigned char byte = *buffer++;
+
+ if ((byte & 0x80) != 0)
+ return read_unsigned_LEB_128_x(buffer, plen, byte);
+
+ *plen = 1;
+ return static_cast<uint64_t>(byte);
+}
// Read an SLEB 128 encoded integer from BUFFER. Return the length of the
-// encoded integer at the location PLEN.
+// encoded integer at the location PLEN. The common case of a single-byte
+// value is handled inline, and multi-byte values are processed by the _x
+// routine, where BYTE is the first byte of the value.
int64_t
-read_signed_LEB_128(const unsigned char* buffer, size_t* plen);
+read_signed_LEB_128_x(const unsigned char* buffer, size_t* plen,
+ unsigned char byte);
+
+inline int64_t
+read_signed_LEB_128(const unsigned char* buffer, size_t* plen)
+{
+ unsigned char byte = *buffer++;
+
+ if ((byte & 0x80) != 0)
+ return read_signed_LEB_128_x(buffer, plen, byte);
+
+ *plen = 1;
+ if (byte & 0x40)
+ return -(static_cast<int64_t>(1) << 7) | static_cast<int64_t>(byte);
+ return static_cast<int64_t>(byte);
+}
// Write a ULEB 128 encoded VALUE to BUFFER.