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3666a04883
This commits the result of running gdb/copyright.py as per our Start
of New Year procedure...
gdb/ChangeLog
Update copyright year range in copyright header of all GDB files.
137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
/* Low-level DWARF 2 reading code
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Copyright (C) 1994-2021 Free Software Foundation, Inc.
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Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
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Inc. with support from Florida State University (under contract
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with the Ada Joint Program Office), and Silicon Graphics, Inc.
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Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
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based on Fred Fish's (Cygnus Support) implementation of DWARF 1
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support.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "dwarf2/leb.h"
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ULONGEST
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read_unsigned_leb128 (bfd *abfd, const gdb_byte *buf,
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unsigned int *bytes_read_ptr)
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{
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ULONGEST result;
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unsigned int num_read;
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int shift;
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unsigned char byte;
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result = 0;
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shift = 0;
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num_read = 0;
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while (1)
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{
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byte = bfd_get_8 (abfd, buf);
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buf++;
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num_read++;
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result |= ((ULONGEST) (byte & 127) << shift);
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if ((byte & 128) == 0)
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{
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break;
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}
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shift += 7;
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}
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*bytes_read_ptr = num_read;
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return result;
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}
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LONGEST
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read_signed_leb128 (bfd *abfd, const gdb_byte *buf,
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unsigned int *bytes_read_ptr)
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{
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ULONGEST result;
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int shift, num_read;
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unsigned char byte;
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result = 0;
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shift = 0;
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num_read = 0;
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while (1)
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{
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byte = bfd_get_8 (abfd, buf);
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buf++;
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num_read++;
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result |= ((ULONGEST) (byte & 127) << shift);
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shift += 7;
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if ((byte & 128) == 0)
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{
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break;
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}
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}
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if ((shift < 8 * sizeof (result)) && (byte & 0x40))
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result |= -(((ULONGEST) 1) << shift);
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*bytes_read_ptr = num_read;
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return result;
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}
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/* See leb.h. */
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LONGEST
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read_initial_length (bfd *abfd, const gdb_byte *buf, unsigned int *bytes_read,
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bool handle_nonstd)
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{
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LONGEST length = bfd_get_32 (abfd, buf);
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if (length == 0xffffffff)
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{
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length = bfd_get_64 (abfd, buf + 4);
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*bytes_read = 12;
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}
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else if (handle_nonstd && length == 0)
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{
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/* Handle the (non-standard) 64-bit DWARF2 format used by IRIX. */
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length = bfd_get_64 (abfd, buf);
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*bytes_read = 8;
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}
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else
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{
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*bytes_read = 4;
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}
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return length;
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}
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/* See leb.h. */
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LONGEST
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read_offset (bfd *abfd, const gdb_byte *buf, unsigned int offset_size)
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{
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LONGEST retval = 0;
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switch (offset_size)
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{
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case 4:
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retval = bfd_get_32 (abfd, buf);
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break;
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case 8:
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retval = bfd_get_64 (abfd, buf);
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break;
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default:
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internal_error (__FILE__, __LINE__,
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_("read_offset_1: bad switch [in module %s]"),
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bfd_get_filename (abfd));
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}
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return retval;
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}
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