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author | Andrew Hsieh <andrewhsieh@google.com> | 2014-06-13 12:38:00 -0700 |
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committer | Andrew Hsieh <andrewhsieh@google.com> | 2014-06-13 12:38:00 -0700 |
commit | 54f1b3cf509cd889905287cb8ce6c5ae33911a21 (patch) | |
tree | e39b1a7fa04db86a8215b7f9d4656d74e394aec0 /binutils-2.25/gold/int_encoding.cc | |
parent | 2a6558a8ecfb81d75215b4ec7dc61113e12cfd5f (diff) | |
download | toolchain_binutils-54f1b3cf509cd889905287cb8ce6c5ae33911a21.tar.gz toolchain_binutils-54f1b3cf509cd889905287cb8ce6c5ae33911a21.tar.bz2 toolchain_binutils-54f1b3cf509cd889905287cb8ce6c5ae33911a21.zip |
Add upstream binutils-2.25 snapshot 4/4 2014
For MIPS -mmsa support
Change-Id: I08c4f002fa7b33dec85ed75956e6ab551bb03c96
Diffstat (limited to 'binutils-2.25/gold/int_encoding.cc')
-rw-r--r-- | binutils-2.25/gold/int_encoding.cc | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/binutils-2.25/gold/int_encoding.cc b/binutils-2.25/gold/int_encoding.cc new file mode 100644 index 00000000..78874779 --- /dev/null +++ b/binutils-2.25/gold/int_encoding.cc @@ -0,0 +1,134 @@ +// int_encoding.cc -- variable length and unaligned integer encoding support. + +// Copyright 2009, 2010 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>. + +// This file is part of gold. + +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 3 of the License, or +// (at your option) any later version. + +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, +// MA 02110-1301, USA. + +#include "gold.h" + +#include <vector> + +#include "int_encoding.h" + +namespace gold { + +// Read an unsigned LEB128 number. Each byte contains 7 bits of +// information, plus one bit saying whether the number continues or +// not. BYTE contains the first byte of the number, and is guaranteed +// to have the continuation bit set. + +uint64_t +read_unsigned_LEB_128_x(const unsigned char* buffer, size_t* len, + unsigned char byte) +{ + uint64_t result = static_cast<uint64_t>(byte & 0x7f); + size_t num_read = 1; + unsigned int shift = 7; + + do + { + if (num_read > 64 / 7 + 1) + { + gold_warning(_("Unusually large LEB128 decoded, " + "debug information may be corrupted")); + break; + } + byte = *buffer++; + num_read++; + result |= (static_cast<uint64_t>(byte & 0x7f)) << shift; + shift += 7; + } + while (byte & 0x80); + + *len = num_read; + + return result; +} + +// Read a signed LEB128 number. These are like regular LEB128 +// numbers, except the last byte may have a sign bit set. +// BYTE contains the first byte of the number, and is guaranteed +// to have the continuation bit set. + +int64_t +read_signed_LEB_128_x(const unsigned char* buffer, size_t* len, + unsigned char byte) +{ + int64_t result = static_cast<uint64_t>(byte & 0x7f); + int shift = 7; + size_t num_read = 1; + + do + { + if (num_read > 64 / 7 + 1) + { + gold_warning(_("Unusually large LEB128 decoded, " + "debug information may be corrupted")); + break; + } + byte = *buffer++; + num_read++; + result |= (static_cast<uint64_t>(byte & 0x7f) << shift); + shift += 7; + } + while (byte & 0x80); + + if ((shift < 8 * static_cast<int>(sizeof(result))) && (byte & 0x40)) + result |= -((static_cast<int64_t>(1)) << shift); + *len = num_read; + return result; +} + +void +write_unsigned_LEB_128(std::vector<unsigned char>* buffer, uint64_t value) +{ + do + { + unsigned char current_byte = value & 0x7f; + value >>= 7; + if (value != 0) + { + current_byte |= 0x80; + } + buffer->push_back(current_byte); + } + while (value != 0); +} + +size_t +get_length_as_unsigned_LEB_128(uint64_t value) +{ + size_t length = 0; + do + { + unsigned char current_byte = value & 0x7f; + value >>= 7; + if (value != 0) + { + current_byte |= 0x80; + } + length++; + } + while (value != 0); + return length; +} + +} // End namespace gold. |