1458 lines
36 KiB
C
1458 lines
36 KiB
C
/* DWARF 2 support.
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Copyright 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
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Adapted from gdb/dwarf2read.c by Gavin Koch of Cygnus Solutions
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(gavin@cygnus.com).
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From the dwarf2read.c header:
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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 in dwarfread.c
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This file is part of BFD.
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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 2 of the License, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "libiberty.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf/dwarf2.h"
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/* The data in the .debug_line statement prologue looks like this. */
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struct line_head
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{
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unsigned int total_length;
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unsigned short version;
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unsigned int prologue_length;
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unsigned char minimum_instruction_length;
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unsigned char default_is_stmt;
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int line_base;
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unsigned char line_range;
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unsigned char opcode_base;
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unsigned char *standard_opcode_lengths;
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};
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/* Attributes have a name and a value */
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struct attribute
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{
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enum dwarf_attribute name;
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enum dwarf_form form;
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union
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{
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char *str;
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struct dwarf_block *blk;
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unsigned int unsnd;
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int snd;
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bfd_vma addr;
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}
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u;
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};
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/* Get at parts of an attribute structure */
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#define DW_STRING(attr) ((attr)->u.str)
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#define DW_UNSND(attr) ((attr)->u.unsnd)
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#define DW_BLOCK(attr) ((attr)->u.blk)
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#define DW_SND(attr) ((attr)->u.snd)
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#define DW_ADDR(attr) ((attr)->u.addr)
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/* Blocks are a bunch of untyped bytes. */
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struct dwarf_block
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{
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unsigned int size;
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char *data;
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};
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struct dwarf2_debug {
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/* A list of all previously read comp_units. */
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struct comp_unit* all_comp_units;
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/* The next unread compilation unit within the .debug_info section.
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Zero indicates that the .debug_info section has not been loaded
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into a buffer yet.*/
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char* info_ptr;
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/* Pointer to the end of the .debug_info section memory buffer. */
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char* info_ptr_end;
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/* Pointer to the .debug_abbrev section loaded into memory. */
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char* dwarf_abbrev_buffer;
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/* Length of the loaded .debug_abbrev section. */
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unsigned long dwarf_abbrev_size;
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};
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/* VERBATUM
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The following function up to the END VERBATUM mark are
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copied directly from dwarf2read.c. */
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/* read dwarf information from a buffer */
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static unsigned int
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read_1_byte (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_8 (abfd, (bfd_byte *) buf);
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}
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static int
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read_1_signed_byte (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_signed_8 (abfd, (bfd_byte *) buf);
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}
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static unsigned int
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read_2_bytes (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_16 (abfd, (bfd_byte *) buf);
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}
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#if 0
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/* This is not used. */
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static int
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read_2_signed_bytes (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_signed_16 (abfd, (bfd_byte *) buf);
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}
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#endif
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static unsigned int
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read_4_bytes (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_32 (abfd, (bfd_byte *) buf);
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}
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#if 0
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/* This is not used. */
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static int
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read_4_signed_bytes (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_signed_32 (abfd, (bfd_byte *) buf);
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}
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#endif
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static unsigned int
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read_8_bytes (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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return bfd_get_64 (abfd, (bfd_byte *) buf);
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}
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static char *
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read_n_bytes (abfd, buf, size)
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bfd * abfd;
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char *buf;
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unsigned int size;
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{
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/* If the size of a host char is 8 bits, we can return a pointer
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to the buffer, otherwise we have to copy the data to a buffer
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allocated on the temporary obstack. */
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return buf;
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}
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static char *
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read_string (abfd, buf, bytes_read_ptr)
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bfd *abfd;
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char *buf;
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unsigned int *bytes_read_ptr;
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{
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/* If the size of a host char is 8 bits, we can return a pointer
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to the string, otherwise we have to copy the string to a buffer
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allocated on the temporary obstack. */
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if (*buf == '\0')
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{
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*bytes_read_ptr = 1;
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return NULL;
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}
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*bytes_read_ptr = strlen (buf) + 1;
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return buf;
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}
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static unsigned int
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read_unsigned_leb128 (abfd, buf, bytes_read_ptr)
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bfd *abfd;
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char *buf;
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unsigned int *bytes_read_ptr;
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{
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unsigned int result, num_read;
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int i, 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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i = 0;
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while (1)
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{
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byte = bfd_get_8 (abfd, (bfd_byte *) buf);
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buf++;
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num_read++;
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result |= ((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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static int
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read_signed_leb128 (abfd, buf, bytes_read_ptr)
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bfd *abfd;
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char *buf;
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unsigned int *bytes_read_ptr;
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{
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int result;
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int i, shift, size, 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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size = 32;
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num_read = 0;
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i = 0;
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while (1)
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{
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byte = bfd_get_8 (abfd, (bfd_byte *) buf);
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buf++;
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num_read++;
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result |= ((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 < size) && (byte & 0x40))
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{
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result |= -(1 << shift);
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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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/* END VERBATUM */
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static bfd_vma
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read_address (abfd, buf)
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bfd *abfd;
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char *buf;
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{
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bfd_vma retval = 0;
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if (sizeof(retval) == 4)
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{
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retval = bfd_get_32 (abfd, (bfd_byte *) buf);
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} else {
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retval = bfd_get_64 (abfd, (bfd_byte *) buf);
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}
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return retval;
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}
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/* This data structure holds the information of an abbrev. */
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struct abbrev_info
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{
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unsigned int number; /* number identifying abbrev */
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enum dwarf_tag tag; /* dwarf tag */
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int has_children; /* boolean */
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unsigned int num_attrs; /* number of attributes */
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struct attr_abbrev *attrs; /* an array of attribute descriptions */
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struct abbrev_info *next; /* next in chain */
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};
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struct attr_abbrev
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{
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enum dwarf_attribute name;
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enum dwarf_form form;
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};
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#ifndef ABBREV_HASH_SIZE
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#define ABBREV_HASH_SIZE 121
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#endif
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#ifndef ATTR_ALLOC_CHUNK
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#define ATTR_ALLOC_CHUNK 4
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#endif
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/* Lookup an abbrev_info structure in the abbrev hash table. */
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static struct abbrev_info *
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lookup_abbrev (number,abbrevs)
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unsigned int number;
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struct abbrev_info **abbrevs;
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{
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unsigned int hash_number;
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struct abbrev_info *abbrev;
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hash_number = number % ABBREV_HASH_SIZE;
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abbrev = abbrevs[hash_number];
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while (abbrev)
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{
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if (abbrev->number == number)
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return abbrev;
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else
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abbrev = abbrev->next;
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}
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return NULL;
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}
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/* In DWARF version 2, the description of the debugging information is
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stored in a separate .debug_abbrev section. Before we read any
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dies from a section we read in all abbreviations and install them
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in a hash table. */
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static struct abbrev_info**
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read_abbrevs (abfd, offset)
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bfd * abfd;
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unsigned int offset;
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{
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struct abbrev_info **abbrevs;
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char *abbrev_ptr;
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struct abbrev_info *cur_abbrev;
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unsigned int abbrev_number, bytes_read, abbrev_name;
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unsigned int abbrev_form, hash_number;
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struct dwarf2_debug *stash;
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stash = elf_tdata(abfd)->dwarf2_find_line_info;
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if (! stash->dwarf_abbrev_buffer)
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{
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asection *msec;
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msec = bfd_get_section_by_name (abfd, ".debug_abbrev");
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if (! msec)
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{
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(*_bfd_error_handler) ("Dwarf Error: Can't find .debug_abbrev section.");
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bfd_set_error (bfd_error_bad_value);
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return 0;
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}
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stash->dwarf_abbrev_size = bfd_get_section_size_before_reloc (msec);
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stash->dwarf_abbrev_buffer = (unsigned char*) bfd_alloc (abfd, stash->dwarf_abbrev_size);
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if (! stash->dwarf_abbrev_buffer)
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return 0;
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if (! bfd_get_section_contents (abfd, msec,
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stash->dwarf_abbrev_buffer, 0,
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stash->dwarf_abbrev_size))
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return 0;
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}
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if (offset > stash->dwarf_abbrev_size)
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{
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(*_bfd_error_handler) ("Dwarf Error: Abbrev offset (%u) bigger than abbrev size (%u).",
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offset, stash->dwarf_abbrev_size );
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bfd_set_error (bfd_error_bad_value);
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return 0;
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}
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abbrevs = (struct abbrev_info**) bfd_zalloc (abfd, sizeof(struct abbrev_info*) * ABBREV_HASH_SIZE);
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abbrev_ptr = stash->dwarf_abbrev_buffer + offset;
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abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
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abbrev_ptr += bytes_read;
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/* loop until we reach an abbrev number of 0 */
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while (abbrev_number)
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{
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cur_abbrev = (struct abbrev_info*)bfd_zalloc (abfd, sizeof (struct abbrev_info));
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/* read in abbrev header */
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cur_abbrev->number = abbrev_number;
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cur_abbrev->tag = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
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abbrev_ptr += bytes_read;
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cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
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abbrev_ptr += 1;
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/* now read in declarations */
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abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
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abbrev_ptr += bytes_read;
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abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
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abbrev_ptr += bytes_read;
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while (abbrev_name)
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{
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if ((cur_abbrev->num_attrs % ATTR_ALLOC_CHUNK) == 0)
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{
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cur_abbrev->attrs = (struct attr_abbrev *)
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bfd_realloc (cur_abbrev->attrs,
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(cur_abbrev->num_attrs + ATTR_ALLOC_CHUNK)
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* sizeof (struct attr_abbrev));
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if (! cur_abbrev->attrs)
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return 0;
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}
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cur_abbrev->attrs[cur_abbrev->num_attrs].name = abbrev_name;
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cur_abbrev->attrs[cur_abbrev->num_attrs++].form = abbrev_form;
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abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
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abbrev_ptr += bytes_read;
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abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
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abbrev_ptr += bytes_read;
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}
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hash_number = abbrev_number % ABBREV_HASH_SIZE;
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cur_abbrev->next = abbrevs[hash_number];
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abbrevs[hash_number] = cur_abbrev;
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/* Get next abbreviation.
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Under Irix6 the abbreviations for a compilation unit are not
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always properly terminated with an abbrev number of 0.
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Exit loop if we encounter an abbreviation which we have
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already read (which means we are about to read the abbreviations
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for the next compile unit) or if the end of the abbreviation
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table is reached. */
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if ((unsigned int) (abbrev_ptr - stash->dwarf_abbrev_buffer)
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>= stash->dwarf_abbrev_size)
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break;
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abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
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abbrev_ptr += bytes_read;
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if (lookup_abbrev (abbrev_number,abbrevs) != NULL)
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break;
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}
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return abbrevs;
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}
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/* Read an attribute described by an abbreviated attribute. */
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static char *
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read_attribute (attr, abbrev, abfd, info_ptr)
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struct attribute *attr;
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struct attr_abbrev *abbrev;
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bfd *abfd;
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char *info_ptr;
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{
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unsigned int bytes_read;
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struct dwarf_block *blk;
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attr->name = abbrev->name;
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attr->form = abbrev->form;
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switch (abbrev->form)
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{
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case DW_FORM_addr:
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case DW_FORM_ref_addr:
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DW_ADDR (attr) = read_address (abfd, info_ptr);
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info_ptr += sizeof(bfd_vma);
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break;
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case DW_FORM_block2:
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blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block));
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blk->size = read_2_bytes (abfd, info_ptr);
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info_ptr += 2;
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blk->data = read_n_bytes (abfd, info_ptr, blk->size);
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info_ptr += blk->size;
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DW_BLOCK (attr) = blk;
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break;
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case DW_FORM_block4:
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blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block));
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blk->size = read_4_bytes (abfd, info_ptr);
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info_ptr += 4;
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blk->data = read_n_bytes (abfd, info_ptr, blk->size);
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info_ptr += blk->size;
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DW_BLOCK (attr) = blk;
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break;
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case DW_FORM_data2:
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DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
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info_ptr += 2;
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break;
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case DW_FORM_data4:
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DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
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info_ptr += 4;
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break;
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case DW_FORM_data8:
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DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
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info_ptr += 8;
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break;
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case DW_FORM_string:
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DW_STRING (attr) = read_string (abfd, info_ptr, &bytes_read);
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info_ptr += bytes_read;
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break;
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case DW_FORM_block:
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blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block));
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blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
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info_ptr += bytes_read;
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blk->data = read_n_bytes (abfd, info_ptr, blk->size);
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info_ptr += blk->size;
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DW_BLOCK (attr) = blk;
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break;
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case DW_FORM_block1:
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blk = (struct dwarf_block *) bfd_alloc (abfd, sizeof (struct dwarf_block));
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blk->size = read_1_byte (abfd, info_ptr);
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info_ptr += 1;
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blk->data = read_n_bytes (abfd, info_ptr, blk->size);
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info_ptr += blk->size;
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DW_BLOCK (attr) = blk;
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break;
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case DW_FORM_data1:
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DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
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info_ptr += 1;
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break;
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case DW_FORM_flag:
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DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
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info_ptr += 1;
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break;
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case DW_FORM_sdata:
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DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
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info_ptr += bytes_read;
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|
break;
|
|
case DW_FORM_udata:
|
|
DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
break;
|
|
case DW_FORM_ref1:
|
|
DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
|
|
info_ptr += 1;
|
|
break;
|
|
case DW_FORM_ref2:
|
|
DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
|
|
info_ptr += 2;
|
|
break;
|
|
case DW_FORM_ref4:
|
|
DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
|
|
info_ptr += 4;
|
|
break;
|
|
case DW_FORM_ref_udata:
|
|
DW_UNSND (attr) = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
break;
|
|
case DW_FORM_strp:
|
|
case DW_FORM_indirect:
|
|
default:
|
|
(*_bfd_error_handler) ("Dwarf Error: Invalid or unhandled FORM value: %d.",
|
|
abbrev->form);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
}
|
|
return info_ptr;
|
|
}
|
|
|
|
|
|
/* Source line information table routines. */
|
|
|
|
#define FILE_ALLOC_CHUNK 5
|
|
#define DIR_ALLOC_CHUNK 5
|
|
|
|
struct line_info {
|
|
struct line_info* prev_line;
|
|
|
|
bfd_vma address;
|
|
char* filename;
|
|
unsigned int line;
|
|
unsigned int column;
|
|
};
|
|
|
|
struct fileinfo {
|
|
char *name;
|
|
unsigned int dir;
|
|
unsigned int time;
|
|
unsigned int size;
|
|
};
|
|
|
|
struct line_info_table {
|
|
bfd* abfd;
|
|
|
|
unsigned int num_files;
|
|
unsigned int num_dirs;
|
|
|
|
char* comp_dir;
|
|
char** dirs;
|
|
struct fileinfo* files;
|
|
struct line_info* last_line;
|
|
};
|
|
|
|
static void
|
|
add_line_info (table, address, filename, line, column)
|
|
struct line_info_table* table;
|
|
bfd_vma address;
|
|
char* filename;
|
|
unsigned int line;
|
|
unsigned int column;
|
|
{
|
|
struct line_info* info = (struct line_info*)
|
|
bfd_alloc (table->abfd, sizeof (struct line_info));
|
|
|
|
info->prev_line = table->last_line;
|
|
table->last_line = info;
|
|
|
|
info->address = address;
|
|
info->filename = filename;
|
|
info->line = line;
|
|
info->column = column;
|
|
}
|
|
|
|
static char*
|
|
concat_filename (table, file)
|
|
struct line_info_table* table;
|
|
unsigned int file;
|
|
{
|
|
char* filename = table->files[file - 1].name;
|
|
if (*filename == '/')
|
|
return filename;
|
|
|
|
else
|
|
{
|
|
char* dirname = (table->files[file - 1].dir
|
|
? table->dirs[table->files[file - 1].dir - 1]
|
|
: table->comp_dir);
|
|
return (char*) concat (dirname, "/", filename, NULL);
|
|
}
|
|
}
|
|
|
|
/* Decode the line number information for the compilation unit whose
|
|
line number info is at OFFSET in the .debug_line section.
|
|
The compilation directory of the file is passed in COMP_DIR. */
|
|
|
|
static struct line_info_table*
|
|
decode_line_info (abfd, offset, comp_dir)
|
|
bfd *abfd;
|
|
unsigned int offset;
|
|
char *comp_dir;
|
|
{
|
|
static char* dwarf_line_buffer = 0;
|
|
|
|
struct line_info_table* table;
|
|
|
|
char *line_ptr;
|
|
char *line_end;
|
|
struct line_head lh;
|
|
unsigned int i, bytes_read;
|
|
char *cur_file, *cur_dir;
|
|
unsigned char op_code, extended_op, adj_opcode;
|
|
|
|
if (! dwarf_line_buffer)
|
|
{
|
|
asection *msec;
|
|
unsigned long size;
|
|
|
|
msec = bfd_get_section_by_name (abfd, ".debug_line");
|
|
if (! msec)
|
|
{
|
|
(*_bfd_error_handler) ("Dwarf Error: Can't find .debug_line section.");
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
size = bfd_get_section_size_before_reloc (msec);
|
|
dwarf_line_buffer = (unsigned char*) bfd_alloc (abfd, size);
|
|
if (! dwarf_line_buffer)
|
|
return 0;
|
|
|
|
if (! bfd_get_section_contents (abfd, msec,
|
|
dwarf_line_buffer, 0,
|
|
size))
|
|
return 0;
|
|
}
|
|
|
|
table = (struct line_info_table*) bfd_alloc (abfd,
|
|
sizeof (struct line_info_table));
|
|
table->abfd = abfd;
|
|
table->comp_dir = comp_dir;
|
|
|
|
table->num_files = 0;
|
|
table->files = NULL;
|
|
|
|
table->num_dirs = 0;
|
|
table->dirs = NULL;
|
|
|
|
line_ptr = dwarf_line_buffer + offset;
|
|
|
|
/* read in the prologue */
|
|
lh.total_length = read_4_bytes (abfd, line_ptr);
|
|
line_ptr += 4;
|
|
line_end = line_ptr + lh.total_length;
|
|
lh.version = read_2_bytes (abfd, line_ptr);
|
|
line_ptr += 2;
|
|
lh.prologue_length = read_4_bytes (abfd, line_ptr);
|
|
line_ptr += 4;
|
|
lh.minimum_instruction_length = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
lh.default_is_stmt = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
lh.line_base = read_1_signed_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
lh.line_range = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
lh.opcode_base = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
lh.standard_opcode_lengths = (unsigned char *)
|
|
bfd_alloc (abfd, lh.opcode_base * sizeof (unsigned char));
|
|
|
|
lh.standard_opcode_lengths[0] = 1;
|
|
for (i = 1; i < lh.opcode_base; ++i)
|
|
{
|
|
lh.standard_opcode_lengths[i] = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
}
|
|
|
|
/* Read directory table */
|
|
while ((cur_dir = read_string (abfd, line_ptr, &bytes_read)) != NULL)
|
|
{
|
|
line_ptr += bytes_read;
|
|
if ((table->num_dirs % DIR_ALLOC_CHUNK) == 0)
|
|
{
|
|
table->dirs = (char **)
|
|
bfd_realloc (table->dirs,
|
|
(table->num_dirs + DIR_ALLOC_CHUNK) * sizeof (char *));
|
|
if (! table->dirs)
|
|
return 0;
|
|
}
|
|
table->dirs[table->num_dirs++] = cur_dir;
|
|
}
|
|
line_ptr += bytes_read;
|
|
|
|
/* Read file name table */
|
|
while ((cur_file = read_string (abfd, line_ptr, &bytes_read)) != NULL)
|
|
{
|
|
line_ptr += bytes_read;
|
|
if ((table->num_files % FILE_ALLOC_CHUNK) == 0)
|
|
{
|
|
table->files = (struct fileinfo *)
|
|
bfd_realloc (table->files,
|
|
(table->num_files + FILE_ALLOC_CHUNK)
|
|
* sizeof (struct fileinfo));
|
|
if (! table->files)
|
|
return 0;
|
|
}
|
|
table->files[table->num_files].name = cur_file;
|
|
table->files[table->num_files].dir =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->files[table->num_files].time =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->files[table->num_files].size =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->num_files++;
|
|
}
|
|
line_ptr += bytes_read;
|
|
|
|
/* Read the statement sequences until there's nothing left. */
|
|
while (line_ptr < line_end)
|
|
{
|
|
/* state machine registers */
|
|
bfd_vma address = 0;
|
|
char* filename = concat_filename (table, 1);
|
|
unsigned int line = 1;
|
|
unsigned int column = 0;
|
|
int is_stmt = lh.default_is_stmt;
|
|
int basic_block = 0;
|
|
int end_sequence = 0;
|
|
|
|
/* Decode the table. */
|
|
while (! end_sequence)
|
|
{
|
|
op_code = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
switch (op_code)
|
|
{
|
|
case DW_LNS_extended_op:
|
|
line_ptr += 1; /* ignore length */
|
|
extended_op = read_1_byte (abfd, line_ptr);
|
|
line_ptr += 1;
|
|
switch (extended_op)
|
|
{
|
|
case DW_LNE_end_sequence:
|
|
end_sequence = 1;
|
|
add_line_info (table, address, filename, line, column);
|
|
break;
|
|
case DW_LNE_set_address:
|
|
address = read_address (abfd, line_ptr);
|
|
address &= 0xffffffff;
|
|
line_ptr += sizeof (bfd_vma);
|
|
break;
|
|
case DW_LNE_define_file:
|
|
cur_file = read_string (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
if ((table->num_files % FILE_ALLOC_CHUNK) == 0)
|
|
{
|
|
table->files = (struct fileinfo *)
|
|
bfd_realloc (table->files,
|
|
(table->num_files + FILE_ALLOC_CHUNK)
|
|
* sizeof (struct fileinfo));
|
|
if (! table->files)
|
|
return 0;
|
|
}
|
|
table->files[table->num_files].name = cur_file;
|
|
table->files[table->num_files].dir =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->files[table->num_files].time =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->files[table->num_files].size =
|
|
read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
table->num_files++;
|
|
break;
|
|
default:
|
|
(*_bfd_error_handler) ("Dwarf Error: mangled line number section.");
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
break;
|
|
case DW_LNS_copy:
|
|
add_line_info (table, address, filename, line, column);
|
|
basic_block = 0;
|
|
break;
|
|
case DW_LNS_advance_pc:
|
|
address += lh.minimum_instruction_length
|
|
* read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
break;
|
|
case DW_LNS_advance_line:
|
|
line += read_signed_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
break;
|
|
case DW_LNS_set_file:
|
|
{
|
|
unsigned int file;
|
|
|
|
/* The file and directory tables are 0 based, the references
|
|
are 1 based. */
|
|
file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
filename = concat_filename (table, file);
|
|
break;
|
|
}
|
|
case DW_LNS_set_column:
|
|
column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
|
|
line_ptr += bytes_read;
|
|
break;
|
|
case DW_LNS_negate_stmt:
|
|
is_stmt = (!is_stmt);
|
|
break;
|
|
case DW_LNS_set_basic_block:
|
|
basic_block = 1;
|
|
break;
|
|
case DW_LNS_const_add_pc:
|
|
address += (255 - lh.opcode_base) / lh.line_range;
|
|
break;
|
|
case DW_LNS_fixed_advance_pc:
|
|
address += read_2_bytes (abfd, line_ptr);
|
|
line_ptr += 2;
|
|
break;
|
|
default: /* special operand */
|
|
adj_opcode = op_code - lh.opcode_base;
|
|
address += (adj_opcode / lh.line_range)
|
|
* lh.minimum_instruction_length;
|
|
line += lh.line_base + (adj_opcode % lh.line_range);
|
|
/* append row to matrix using current values */
|
|
add_line_info (table, address, filename, line, column);
|
|
basic_block = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return table;
|
|
}
|
|
|
|
|
|
/* If ADDR is within TABLE set the output parameters and return true,
|
|
otherwise return false. The output parameters, FILENAME_PTR and
|
|
LINENUMBER_PTR, are pointers to the objects to be filled in. */
|
|
|
|
static boolean
|
|
lookup_address_in_line_info_table (table,
|
|
addr,
|
|
filename_ptr,
|
|
linenumber_ptr)
|
|
struct line_info_table* table;
|
|
bfd_vma addr;
|
|
const char **filename_ptr;
|
|
unsigned int *linenumber_ptr;
|
|
{
|
|
struct line_info* each_line;
|
|
struct line_info* next_line;
|
|
|
|
for (next_line = 0, each_line = table->last_line;
|
|
each_line;
|
|
next_line = each_line, each_line = each_line->prev_line)
|
|
{
|
|
if (addr >= each_line->address
|
|
&& (next_line == 0
|
|
|| addr < next_line->address))
|
|
{
|
|
*filename_ptr = each_line->filename;
|
|
*linenumber_ptr = each_line->line;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Function table functions. */
|
|
|
|
struct funcinfo {
|
|
struct funcinfo *prev_func;
|
|
|
|
char* name;
|
|
bfd_vma low;
|
|
bfd_vma high;
|
|
};
|
|
|
|
|
|
/* If ADDR is within TABLE, set FUNCTIONNAME_PTR, and return true. */
|
|
|
|
static boolean
|
|
lookup_address_in_function_table (table,
|
|
addr,
|
|
functionname_ptr)
|
|
struct funcinfo* table;
|
|
bfd_vma addr;
|
|
const char **functionname_ptr;
|
|
{
|
|
struct funcinfo* each_func;
|
|
|
|
for (each_func = table;
|
|
each_func;
|
|
each_func = each_func->prev_func)
|
|
{
|
|
if (addr >= (each_func->low & 0xffffffff)
|
|
&& addr < (each_func->high & 0xffffffff))
|
|
{
|
|
*functionname_ptr = each_func->name;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
|
|
|
|
/* DWARF2 Compilation unit functions. */
|
|
|
|
|
|
/* A minimal decoding of DWARF2 compilation units. We only decode
|
|
what's needed to get to the line number information. */
|
|
|
|
struct comp_unit {
|
|
|
|
/* Chain the previously read compilation units. */
|
|
struct comp_unit* next_unit;
|
|
|
|
/* Keep the bdf convenient (for memory allocation). */
|
|
bfd* abfd;
|
|
|
|
/* The lowest and higest addresses contained in this compilation
|
|
unit as specified in the compilation unit header. */
|
|
bfd_vma low;
|
|
bfd_vma high;
|
|
|
|
/* The DW_AT_name attribute (for error messages). */
|
|
char* name;
|
|
|
|
/* The abbrev hash table. */
|
|
struct abbrev_info** abbrevs;
|
|
|
|
/* Note that an error was found by comp_unit_find_nearest_line. */
|
|
int error;
|
|
|
|
/* The DW_AT_comp_dir attribute */
|
|
char* comp_dir;
|
|
|
|
/* True if there is a line number table associated with this comp. unit. */
|
|
int stmtlist;
|
|
|
|
/* The offset into .debug_line of the line number table. */
|
|
unsigned long line_offset;
|
|
|
|
/* Pointer to the first child die for the comp unit. */
|
|
char *first_child_die_ptr;
|
|
|
|
/* The end of the comp unit. */
|
|
char *end_ptr;
|
|
|
|
/* The decoded line number, NULL if not yet decoded. */
|
|
struct line_info_table* line_table;
|
|
|
|
/* A list of the functions found in this comp. unit. */
|
|
struct funcinfo* function_table;
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Scan over each die in a comp. unit looking for functions to add
|
|
to the function table. */
|
|
|
|
static boolean
|
|
scan_unit_for_functions (unit)
|
|
struct comp_unit *unit;
|
|
{
|
|
bfd *abfd = unit->abfd;
|
|
char *info_ptr = unit->first_child_die_ptr;
|
|
int nesting_level = 1;
|
|
|
|
while (nesting_level)
|
|
{
|
|
unsigned int abbrev_number, bytes_read, i;
|
|
struct abbrev_info *abbrev;
|
|
struct attribute attr;
|
|
struct funcinfo *func;
|
|
char* name = 0;
|
|
|
|
abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
|
|
if (! abbrev_number)
|
|
{
|
|
nesting_level--;
|
|
continue;
|
|
}
|
|
|
|
abbrev = lookup_abbrev (abbrev_number,unit->abbrevs);
|
|
if (! abbrev)
|
|
{
|
|
(*_bfd_error_handler) ("Dwarf Error: Could not find abbrev number %d.",
|
|
abbrev_number);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return false;
|
|
}
|
|
|
|
if (abbrev->tag == DW_TAG_subprogram)
|
|
{
|
|
func = (struct funcinfo*) bfd_zalloc (abfd, sizeof (struct funcinfo));
|
|
func->prev_func = unit->function_table;
|
|
unit->function_table = func;
|
|
}
|
|
else
|
|
func = NULL;
|
|
|
|
for (i = 0; i < abbrev->num_attrs; ++i)
|
|
{
|
|
info_ptr = read_attribute (&attr, &abbrev->attrs[i], abfd, info_ptr);
|
|
|
|
if (func)
|
|
{
|
|
switch (attr.name)
|
|
{
|
|
case DW_AT_name:
|
|
|
|
name = DW_STRING (&attr);
|
|
|
|
/* Prefer DW_AT_MIPS_linkage_name over DW_AT_name. */
|
|
if (func->name == NULL)
|
|
func->name = DW_STRING (&attr);
|
|
break;
|
|
|
|
case DW_AT_MIPS_linkage_name:
|
|
func->name = DW_STRING (&attr);
|
|
break;
|
|
|
|
case DW_AT_low_pc:
|
|
func->low = DW_ADDR (&attr);
|
|
break;
|
|
|
|
case DW_AT_high_pc:
|
|
func->high = DW_ADDR (&attr);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
switch (attr.name)
|
|
{
|
|
case DW_AT_name:
|
|
name = DW_STRING (&attr);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (abbrev->has_children)
|
|
nesting_level++;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Parse a DWARF2 compilation unit starting at INFO_PTR. This includes
|
|
the compilation unit header that proceeds the DIE's, but does not
|
|
include the length field that preceeds each compilation unit header.
|
|
END_PTR points one past the end of this comp unit.
|
|
|
|
This routine does not read the whole compilation unit; only enough
|
|
to get to the line number information for the compilation unit.
|
|
*/
|
|
|
|
static struct comp_unit*
|
|
parse_comp_unit (abfd, info_ptr, end_ptr)
|
|
bfd* abfd;
|
|
char* info_ptr;
|
|
char* end_ptr;
|
|
{
|
|
struct comp_unit* unit;
|
|
|
|
unsigned short version;
|
|
unsigned int abbrev_offset;
|
|
unsigned char addr_size;
|
|
struct abbrev_info** abbrevs;
|
|
|
|
unsigned int abbrev_number, bytes_read, i;
|
|
struct abbrev_info *abbrev;
|
|
struct attribute attr;
|
|
|
|
version = read_2_bytes (abfd, info_ptr);
|
|
info_ptr += 2;
|
|
abbrev_offset = read_4_bytes (abfd, info_ptr);
|
|
info_ptr += 4;
|
|
addr_size = read_1_byte (abfd, info_ptr);
|
|
info_ptr += 1;
|
|
|
|
if (version != 2)
|
|
{
|
|
(*_bfd_error_handler) ("Dwarf Error: found dwarf version '%hu' in compilation unit '%s', this reader only handles version 2 information.",
|
|
version,
|
|
unit->name);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
if (addr_size != sizeof (bfd_vma))
|
|
{
|
|
(*_bfd_error_handler) ("Dwarf Error: found address size '%u' in compilation unit '%s', this readers only handles address size '%u'.",
|
|
addr_size,
|
|
unit->name,
|
|
sizeof (bfd_vma));
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
/* Read the abbrevs for this compilation unit into a table */
|
|
abbrevs = read_abbrevs (abfd, abbrev_offset);
|
|
if (! abbrevs)
|
|
return 0;
|
|
|
|
abbrev_number = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
|
|
info_ptr += bytes_read;
|
|
if (! abbrev_number)
|
|
{
|
|
(*_bfd_error_handler) ("Dwarf Error: Bad abbrev number: %d.",
|
|
abbrev_number);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
abbrev = lookup_abbrev (abbrev_number, abbrevs);
|
|
if (! abbrev)
|
|
{
|
|
(*_bfd_error_handler) ("Dwarf Error: Could not find abbrev number %d.",
|
|
abbrev_number);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return 0;
|
|
}
|
|
|
|
unit = (struct comp_unit*) bfd_zalloc (abfd, sizeof (struct comp_unit));
|
|
unit->abfd = abfd;
|
|
unit->abbrevs = abbrevs;
|
|
unit->end_ptr = end_ptr;
|
|
|
|
for (i = 0; i < abbrev->num_attrs; ++i)
|
|
{
|
|
info_ptr = read_attribute (&attr, &abbrev->attrs[i], abfd, info_ptr);
|
|
|
|
/* Store the data if it is of an attribute we want to keep in a
|
|
partial symbol table. */
|
|
switch (attr.name)
|
|
{
|
|
case DW_AT_stmt_list:
|
|
unit->stmtlist = 1;
|
|
unit->line_offset = DW_UNSND (&attr);
|
|
break;
|
|
|
|
case DW_AT_name:
|
|
unit->name = DW_STRING (&attr);
|
|
break;
|
|
|
|
case DW_AT_low_pc:
|
|
unit->low = DW_ADDR (&attr);
|
|
break;
|
|
|
|
case DW_AT_high_pc:
|
|
unit->high = DW_ADDR (&attr);
|
|
break;
|
|
|
|
case DW_AT_comp_dir:
|
|
{
|
|
char* comp_dir = DW_STRING (&attr);
|
|
if (comp_dir)
|
|
{
|
|
/* Irix 6.2 native cc prepends <machine>.: to the compilation
|
|
directory, get rid of it. */
|
|
char *cp = (char*) strchr (comp_dir, ':');
|
|
|
|
if (cp && cp != comp_dir && cp[-1] == '.' && cp[1] == '/')
|
|
comp_dir = cp + 1;
|
|
}
|
|
unit->comp_dir = comp_dir;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
unit->first_child_die_ptr = info_ptr;
|
|
return unit;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Return true if UNIT contains the address given by ADDR. */
|
|
|
|
static boolean
|
|
comp_unit_contains_address (unit, addr)
|
|
struct comp_unit* unit;
|
|
bfd_vma addr;
|
|
{
|
|
return ! unit->error
|
|
&& ( addr >= (unit->low & 0xffffffff)
|
|
&& addr <= (unit->high & 0xffffffff));
|
|
}
|
|
|
|
|
|
/* If UNIT contains ADDR, set the output parameters to the values for
|
|
the line containing ADDR. The output parameters, FILENAME_PTR,
|
|
FUNCTIONNAME_PTR, and LINENUMBER_PTR, are pointers to the objects
|
|
to be filled in.
|
|
|
|
Return true of UNIT contains ADDR, and no errors were encountered;
|
|
false otherwise. */
|
|
|
|
static boolean
|
|
comp_unit_find_nearest_line (unit, addr,
|
|
filename_ptr, functionname_ptr, linenumber_ptr)
|
|
struct comp_unit* unit;
|
|
bfd_vma addr;
|
|
const char **filename_ptr;
|
|
const char **functionname_ptr;
|
|
unsigned int *linenumber_ptr;
|
|
{
|
|
boolean line_p;
|
|
boolean func_p;
|
|
|
|
if (unit->error)
|
|
return false;
|
|
|
|
if (! unit->line_table)
|
|
{
|
|
if (! unit->stmtlist)
|
|
{
|
|
unit->error = 1;
|
|
return false;
|
|
}
|
|
|
|
unit->line_table = decode_line_info (unit->abfd,
|
|
unit->line_offset,
|
|
unit->comp_dir);
|
|
|
|
if (! unit->line_table)
|
|
{
|
|
unit->error = 1;
|
|
return false;
|
|
}
|
|
|
|
if (! scan_unit_for_functions (unit))
|
|
{
|
|
unit->error = 1;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
line_p = lookup_address_in_line_info_table (unit->line_table,
|
|
addr,
|
|
filename_ptr,
|
|
linenumber_ptr);
|
|
func_p = lookup_address_in_function_table (unit->function_table,
|
|
addr,
|
|
functionname_ptr);
|
|
return line_p || func_p;
|
|
}
|
|
|
|
/* The DWARF2 version of find_nearest line.
|
|
Return true if the line is found without error. */
|
|
|
|
boolean
|
|
_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
|
|
filename_ptr, functionname_ptr, linenumber_ptr)
|
|
bfd *abfd;
|
|
asection *section;
|
|
asymbol **symbols;
|
|
bfd_vma offset;
|
|
const char **filename_ptr;
|
|
const char **functionname_ptr;
|
|
unsigned int *linenumber_ptr;
|
|
{
|
|
/* Read each compilation unit from the section .debug_info, and check
|
|
to see if it contains the address we are searching for. If yes,
|
|
lookup the address, and return the line number info. If no, go
|
|
on to the next compilation unit.
|
|
|
|
We keep a list of all the previously read compilation units, and
|
|
a pointer to the next un-read compilation unit. Check the
|
|
previously read units before reading more.
|
|
*/
|
|
|
|
struct dwarf2_debug *stash = elf_tdata (abfd)->dwarf2_find_line_info;
|
|
|
|
/* What address are we looking for? */
|
|
bfd_vma addr = offset + section->vma;
|
|
|
|
struct comp_unit* each;
|
|
|
|
*filename_ptr = NULL;
|
|
*functionname_ptr = NULL;
|
|
*linenumber_ptr = 0;
|
|
|
|
if (! stash)
|
|
{
|
|
asection *msec;
|
|
unsigned long size;
|
|
|
|
stash = elf_tdata (abfd)->dwarf2_find_line_info =
|
|
(struct dwarf2_debug*) bfd_zalloc (abfd, sizeof (struct dwarf2_debug));
|
|
|
|
if (! stash)
|
|
return false;
|
|
|
|
msec = bfd_get_section_by_name (abfd, ".debug_info");
|
|
if (! msec)
|
|
{
|
|
/* No dwarf2 info. Note that at this point the stash
|
|
has been allocated, but contains zeros, this lets
|
|
future calls to this function fail quicker. */
|
|
return false;
|
|
}
|
|
|
|
size = bfd_get_section_size_before_reloc (msec);
|
|
stash->info_ptr = (unsigned char*) bfd_alloc (abfd, size);
|
|
|
|
if (! stash->info_ptr)
|
|
return false;
|
|
|
|
if (! bfd_get_section_contents (abfd, msec, stash->info_ptr, 0, size))
|
|
{
|
|
stash->info_ptr = 0;
|
|
return false;
|
|
}
|
|
|
|
stash->info_ptr_end = stash->info_ptr + size;
|
|
}
|
|
|
|
|
|
/* A null info_ptr indicates that there is no dwarf2 info
|
|
(or that an error occured while setting up the stash). */
|
|
|
|
if (! stash->info_ptr)
|
|
return false;
|
|
|
|
|
|
|
|
/* Check the previously read comp. units first. */
|
|
|
|
for (each = stash->all_comp_units; each; each = each->next_unit)
|
|
{
|
|
if (comp_unit_contains_address (each, addr))
|
|
return comp_unit_find_nearest_line (each, addr,
|
|
filename_ptr,
|
|
functionname_ptr,
|
|
linenumber_ptr);
|
|
}
|
|
|
|
|
|
/* Read each remaining comp. units checking each as they are read. */
|
|
while (stash->info_ptr < stash->info_ptr_end)
|
|
{
|
|
struct comp_unit* each;
|
|
unsigned int length;
|
|
|
|
length = read_4_bytes (abfd, stash->info_ptr);
|
|
stash->info_ptr += 4;
|
|
|
|
if (length > 0)
|
|
{
|
|
each = parse_comp_unit (abfd, stash->info_ptr,
|
|
stash->info_ptr + length);
|
|
stash->info_ptr += length;
|
|
|
|
if (each)
|
|
{
|
|
each->next_unit = stash->all_comp_units;
|
|
stash->all_comp_units = each;
|
|
|
|
if (comp_unit_contains_address (each, addr))
|
|
return comp_unit_find_nearest_line (each, addr,
|
|
filename_ptr,
|
|
functionname_ptr,
|
|
linenumber_ptr);
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/* end of file */
|