gdb: add target_ops::supports_displaced_step

[deliverable/binutils-gdb.git] / gold / int_encoding.h

diff --git a/gold/int_encoding.h b/gold/int_encoding.h
index 6485a931071058d8f7b6a29a382328e3b719fc3c..3a790bc4f02e085c356190cb439994c979f13b26 100644 (file)
--- a/gold/int_encoding.h
+++ b/gold/int_encoding.h
@@ -1,6 +1,6 @@
 // int_encoding.h -- variable length and unaligned integers -*- C++ -*-
 
-// Copyright 2009 Free Software Foundation, Inc.
+// Copyright (C) 2009-2020 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>.
@@ -38,16 +38,48 @@ namespace gold
 //
 
 // 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.