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freebsd-dev/contrib/binutils/bfd/dwarf2.c
David E. O'Brien 898696a8b3 Import of Binutils from the FSF 2.13 branch (just pre-.2 release). 
These bits are taken from the FSF anoncvs repo on 27-Oct-2002 21:12:00 EST.
2002-12-02 09:06:04 +00:00

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/* DWARF 2 support.
Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
Free Software Foundation, Inc.
Adapted from gdb/dwarf2read.c by Gavin Koch of Cygnus Solutions
(gavin@cygnus.com).
From the dwarf2read.c header:
Adapted by Gary Funck (gary@intrepid.com), Intrepid Technology,
Inc. with support from Florida State University (under contract
with the Ada Joint Program Office), and Silicon Graphics, Inc.
Initial contribution by Brent Benson, Harris Computer Systems, Inc.,
based on Fred Fish's (Cygnus Support) implementation of DWARF 1
support in dwarfread.c
This file is part of BFD.
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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "libiberty.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/dwarf2.h"
/* The data in the .debug_line statement prologue looks like this. */
struct line_head
{
bfd_vma total_length;
unsigned short version;
bfd_vma prologue_length;
unsigned char minimum_instruction_length;
unsigned char default_is_stmt;
int line_base;
unsigned char line_range;
unsigned char opcode_base;
unsigned char *standard_opcode_lengths;
};
/* Attributes have a name and a value. */
struct attribute
{
enum dwarf_attribute name;
enum dwarf_form form;
union
{
char *str;
struct dwarf_block *blk;
unsigned int unsnd;
int snd;
bfd_vma addr;
}
u;
};
/* Get at parts of an attribute structure. */
#define DW_STRING(attr) ((attr)->u.str)
#define DW_UNSND(attr) ((attr)->u.unsnd)
#define DW_BLOCK(attr) ((attr)->u.blk)
#define DW_SND(attr) ((attr)->u.snd)
#define DW_ADDR(attr) ((attr)->u.addr)
/* Blocks are a bunch of untyped bytes. */
struct dwarf_block
{
unsigned int size;
char *data;
};
struct dwarf2_debug
{
/* A list of all previously read comp_units. */
struct comp_unit* all_comp_units;
/* The next unread compilation unit within the .debug_info section.
Zero indicates that the .debug_info section has not been loaded
into a buffer yet. */
char* info_ptr;
/* Pointer to the end of the .debug_info section memory buffer. */
char* info_ptr_end;
/* Pointer to the section and address of the beginning of the
section. */
asection* sec;
char* sec_info_ptr;
/* Pointer to the symbol table. */
asymbol** syms;
/* Pointer to the .debug_abbrev section loaded into memory. */
char* dwarf_abbrev_buffer;
/* Length of the loaded .debug_abbrev section. */
unsigned long dwarf_abbrev_size;
/* Buffer for decode_line_info. */
char *dwarf_line_buffer;
/* Length of the loaded .debug_line section. */
unsigned long dwarf_line_size;
/* Pointer to the .debug_str section loaded into memory. */
char* dwarf_str_buffer;
/* Length of the loaded .debug_str section. */
unsigned long dwarf_str_size;
};
struct arange
{
struct arange *next;
bfd_vma low;
bfd_vma high;
};
/* 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. */
struct arange arange;
/* 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;
/* Pointer to dwarf2_debug structure. */
struct dwarf2_debug *stash;
/* Address size for this unit - from unit header. */
unsigned char addr_size;
/* Offset size for this unit - from unit header. */
unsigned char offset_size;
};
/* This data structure holds the information of an abbrev. */
struct abbrev_info
{
unsigned int number; /* Number identifying abbrev. */
enum dwarf_tag tag; /* DWARF tag. */
int has_children; /* Boolean. */
unsigned int num_attrs; /* Number of attributes. */
struct attr_abbrev *attrs; /* An array of attribute descriptions. */
struct abbrev_info *next; /* Next in chain. */
};
struct attr_abbrev
{
enum dwarf_attribute name;
enum dwarf_form form;
};
#ifndef ABBREV_HASH_SIZE
#define ABBREV_HASH_SIZE 121
#endif
#ifndef ATTR_ALLOC_CHUNK
#define ATTR_ALLOC_CHUNK 4
#endif
static unsigned int read_1_byte PARAMS ((bfd *, char *));
static int read_1_signed_byte PARAMS ((bfd *, char *));
static unsigned int read_2_bytes PARAMS ((bfd *, char *));
static unsigned int read_4_bytes PARAMS ((bfd *, char *));
static bfd_vma read_8_bytes PARAMS ((bfd *, char *));
static char *read_n_bytes PARAMS ((bfd *, char *, unsigned int));
static char *read_string PARAMS ((bfd *, char *, unsigned int *));
static char *read_indirect_string PARAMS ((struct comp_unit *, char *, unsigned int *));
static unsigned int read_unsigned_leb128
PARAMS ((bfd *, char *, unsigned int *));
static int read_signed_leb128
PARAMS ((bfd *, char *, unsigned int *));
static bfd_vma read_address PARAMS ((struct comp_unit *, char *));
static struct abbrev_info *lookup_abbrev
PARAMS ((unsigned int, struct abbrev_info **));
static struct abbrev_info **read_abbrevs
PARAMS ((bfd *, bfd_vma, struct dwarf2_debug *));
static char *read_attribute
PARAMS ((struct attribute *, struct attr_abbrev *,
struct comp_unit *, char *));
static char *read_attribute_value
PARAMS ((struct attribute *, unsigned,
struct comp_unit *, char *));
static void add_line_info
PARAMS ((struct line_info_table *, bfd_vma, char *,
unsigned int, unsigned int, int));
static char *concat_filename PARAMS ((struct line_info_table *, unsigned int));
static void arange_add PARAMS ((struct comp_unit *, bfd_vma, bfd_vma));
static struct line_info_table *decode_line_info
PARAMS ((struct comp_unit *, struct dwarf2_debug *));
static boolean lookup_address_in_line_info_table
PARAMS ((struct line_info_table *, bfd_vma, struct funcinfo *,
const char **, unsigned int *));
static boolean lookup_address_in_function_table
PARAMS ((struct funcinfo *, bfd_vma, struct funcinfo **, const char **));
static boolean scan_unit_for_functions PARAMS ((struct comp_unit *));
static bfd_vma find_rela_addend
PARAMS ((bfd *, asection *, bfd_size_type, asymbol**));
static struct comp_unit *parse_comp_unit
PARAMS ((bfd *, struct dwarf2_debug *, bfd_vma, unsigned int));
static boolean comp_unit_contains_address
PARAMS ((struct comp_unit *, bfd_vma));
static boolean comp_unit_find_nearest_line
PARAMS ((struct comp_unit *, bfd_vma, const char **, const char **,
unsigned int *, struct dwarf2_debug *));
static asection *find_debug_info PARAMS ((bfd *, asection *));
/* VERBATIM
The following function up to the END VERBATIM mark are
copied directly from dwarf2read.c. */
/* Read dwarf information from a buffer. */
static unsigned int
read_1_byte (abfd, buf)
bfd *abfd ATTRIBUTE_UNUSED;
char *buf;
{
return bfd_get_8 (abfd, (bfd_byte *) buf);
}
static int
read_1_signed_byte (abfd, buf)
bfd *abfd ATTRIBUTE_UNUSED;
char *buf;
{
return bfd_get_signed_8 (abfd, (bfd_byte *) buf);
}
static unsigned int
read_2_bytes (abfd, buf)
bfd *abfd;
char *buf;
{
return bfd_get_16 (abfd, (bfd_byte *) buf);
}
#if 0 /* This is not used. */
static int
read_2_signed_bytes (abfd, buf)
bfd *abfd;
char *buf;
{
return bfd_get_signed_16 (abfd, (bfd_byte *) buf);
}
#endif
static unsigned int
read_4_bytes (abfd, buf)
bfd *abfd;
char *buf;
{
return bfd_get_32 (abfd, (bfd_byte *) buf);
}
#if 0 /* This is not used. */
static int
read_4_signed_bytes (abfd, buf)
bfd *abfd;
char *buf;
{
return bfd_get_signed_32 (abfd, (bfd_byte *) buf);
}
#endif
static bfd_vma
read_8_bytes (abfd, buf)
bfd *abfd;
char *buf;
{
return bfd_get_64 (abfd, (bfd_byte *) buf);
}
static char *
read_n_bytes (abfd, buf, size)
bfd *abfd ATTRIBUTE_UNUSED;
char *buf;
unsigned int size ATTRIBUTE_UNUSED;
{
/* If the size of a host char is 8 bits, we can return a pointer
to the buffer, otherwise we have to copy the data to a buffer
allocated on the temporary obstack. */
return buf;
}
static char *
read_string (abfd, buf, bytes_read_ptr)
bfd *abfd ATTRIBUTE_UNUSED;
char *buf;
unsigned int *bytes_read_ptr;
{
/* Return a pointer to the embedded string. */
if (*buf == '\0')
{
*bytes_read_ptr = 1;
return NULL;
}
*bytes_read_ptr = strlen (buf) + 1;
return buf;
}
static char *
read_indirect_string (unit, buf, bytes_read_ptr)
struct comp_unit* unit;
char *buf;
unsigned int *bytes_read_ptr;
{
bfd_vma offset;
struct dwarf2_debug *stash = unit->stash;
if (unit->offset_size == 4)
offset = read_4_bytes (unit->abfd, buf);
else
offset = read_8_bytes (unit->abfd, buf);
*bytes_read_ptr = unit->offset_size;
if (! stash->dwarf_str_buffer)
{
asection *msec;
bfd *abfd = unit->abfd;
msec = bfd_get_section_by_name (abfd, ".debug_str");
if (! msec)
{
(*_bfd_error_handler)
(_("Dwarf Error: Can't find .debug_str section."));
bfd_set_error (bfd_error_bad_value);
return NULL;
}
stash->dwarf_str_size = msec->_raw_size;
stash->dwarf_str_buffer = (char*) bfd_alloc (abfd, msec->_raw_size);
if (! stash->dwarf_abbrev_buffer)
return NULL;
if (! bfd_get_section_contents (abfd, msec, stash->dwarf_str_buffer,
(bfd_vma) 0, msec->_raw_size))
return NULL;
}
if (offset >= stash->dwarf_str_size)
{
(*_bfd_error_handler) (_("Dwarf Error: DW_FORM_strp offset (%lu) greater than or equal to .debug_str size (%lu)."),
(unsigned long) offset, stash->dwarf_str_size);
bfd_set_error (bfd_error_bad_value);
return NULL;
}
buf = stash->dwarf_str_buffer + offset;
if (*buf == '\0')
return NULL;
return buf;
}
static unsigned int
read_unsigned_leb128 (abfd, buf, bytes_read_ptr)
bfd *abfd ATTRIBUTE_UNUSED;
char *buf;
unsigned int *bytes_read_ptr;
{
unsigned int result;
unsigned int num_read;
int shift;
unsigned char byte;
result = 0;
shift = 0;
num_read = 0;
do
{
byte = bfd_get_8 (abfd, (bfd_byte *) buf);
buf ++;
num_read ++;
result |= ((byte & 0x7f) << shift);
shift += 7;
}
while (byte & 0x80);
* bytes_read_ptr = num_read;
return result;
}
static int
read_signed_leb128 (abfd, buf, bytes_read_ptr)
bfd *abfd ATTRIBUTE_UNUSED;
char *buf;
unsigned int * bytes_read_ptr;
{
int result;
int shift;
int num_read;
unsigned char byte;
result = 0;
shift = 0;
num_read = 0;
do
{
byte = bfd_get_8 (abfd, (bfd_byte *) buf);
buf ++;
num_read ++;
result |= ((byte & 0x7f) << shift);
shift += 7;
}
while (byte & 0x80);
if ((shift < 32) && (byte & 0x40))
result |= -(1 << shift);
* bytes_read_ptr = num_read;
return result;
}
/* END VERBATIM */
static bfd_vma
read_address (unit, buf)
struct comp_unit* unit;
char *buf;
{
switch (unit->addr_size)
{
case 8:
return bfd_get_64 (unit->abfd, (bfd_byte *) buf);
case 4:
return bfd_get_32 (unit->abfd, (bfd_byte *) buf);
case 2:
return bfd_get_16 (unit->abfd, (bfd_byte *) buf);
default:
abort ();
}
}
/* Lookup an abbrev_info structure in the abbrev hash table. */
static struct abbrev_info *
lookup_abbrev (number,abbrevs)
unsigned int number;
struct abbrev_info **abbrevs;
{
unsigned int hash_number;
struct abbrev_info *abbrev;
hash_number = number % ABBREV_HASH_SIZE;
abbrev = abbrevs[hash_number];
while (abbrev)
{
if (abbrev->number == number)
return abbrev;
else
abbrev = abbrev->next;
}
return NULL;
}
/* In DWARF version 2, the description of the debugging information is
stored in a separate .debug_abbrev section. Before we read any
dies from a section we read in all abbreviations and install them
in a hash table. */
static struct abbrev_info**
read_abbrevs (abfd, offset, stash)
bfd * abfd;
bfd_vma offset;
struct dwarf2_debug *stash;
{
struct abbrev_info **abbrevs;
char *abbrev_ptr;
struct abbrev_info *cur_abbrev;
unsigned int abbrev_number, bytes_read, abbrev_name;
unsigned int abbrev_form, hash_number;
bfd_size_type amt;
if (! stash->dwarf_abbrev_buffer)
{
asection *msec;
msec = bfd_get_section_by_name (abfd, ".debug_abbrev");
if (! msec)
{
(*_bfd_error_handler) (_("Dwarf Error: Can't find .debug_abbrev section."));
bfd_set_error (bfd_error_bad_value);
return 0;
}
stash->dwarf_abbrev_size = msec->_raw_size;
stash->dwarf_abbrev_buffer = (char*) bfd_alloc (abfd, msec->_raw_size);
if (! stash->dwarf_abbrev_buffer)
return 0;
if (! bfd_get_section_contents (abfd, msec, stash->dwarf_abbrev_buffer,
(bfd_vma) 0, msec->_raw_size))
return 0;
}
if (offset >= stash->dwarf_abbrev_size)
{
(*_bfd_error_handler) (_("Dwarf Error: Abbrev offset (%lu) greater than or equal to .debug_abbrev size (%lu)."),
(unsigned long) offset, stash->dwarf_abbrev_size);
bfd_set_error (bfd_error_bad_value);
return 0;
}
amt = sizeof (struct abbrev_info*) * ABBREV_HASH_SIZE;
abbrevs = (struct abbrev_info**) bfd_zalloc (abfd, amt);
abbrev_ptr = stash->dwarf_abbrev_buffer + offset;
abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
abbrev_ptr += bytes_read;
/* Loop until we reach an abbrev number of 0. */
while (abbrev_number)
{
amt = sizeof (struct abbrev_info);
cur_abbrev = (struct abbrev_info *) bfd_zalloc (abfd, amt);
/* Read in abbrev header. */
cur_abbrev->number = abbrev_number;
cur_abbrev->tag = (enum dwarf_tag)
read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
abbrev_ptr += bytes_read;
cur_abbrev->has_children = read_1_byte (abfd, abbrev_ptr);
abbrev_ptr += 1;
/* Now read in declarations. */
abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
abbrev_ptr += bytes_read;
abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
abbrev_ptr += bytes_read;
while (abbrev_name)
{
if ((cur_abbrev->num_attrs % ATTR_ALLOC_CHUNK) == 0)
{
amt = cur_abbrev->num_attrs + ATTR_ALLOC_CHUNK;
amt *= sizeof (struct attr_abbrev);
cur_abbrev->attrs = ((struct attr_abbrev *)
bfd_realloc (cur_abbrev->attrs, amt));
if (! cur_abbrev->attrs)
return 0;
}
cur_abbrev->attrs[cur_abbrev->num_attrs].name
= (enum dwarf_attribute) abbrev_name;
cur_abbrev->attrs[cur_abbrev->num_attrs++].form
= (enum dwarf_form) abbrev_form;
abbrev_name = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
abbrev_ptr += bytes_read;
abbrev_form = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
abbrev_ptr += bytes_read;
}
hash_number = abbrev_number % ABBREV_HASH_SIZE;
cur_abbrev->next = abbrevs[hash_number];
abbrevs[hash_number] = cur_abbrev;
/* Get next abbreviation.
Under Irix6 the abbreviations for a compilation unit are not
always properly terminated with an abbrev number of 0.
Exit loop if we encounter an abbreviation which we have
already read (which means we are about to read the abbreviations
for the next compile unit) or if the end of the abbreviation
table is reached. */
if ((unsigned int) (abbrev_ptr - stash->dwarf_abbrev_buffer)
>= stash->dwarf_abbrev_size)
break;
abbrev_number = read_unsigned_leb128 (abfd, abbrev_ptr, &bytes_read);
abbrev_ptr += bytes_read;
if (lookup_abbrev (abbrev_number,abbrevs) != NULL)
break;
}
return abbrevs;
}
/* Read an attribute value described by an attribute form. */
static char *
read_attribute_value (attr, form, unit, info_ptr)
struct attribute *attr;
unsigned form;
struct comp_unit *unit;
char *info_ptr;
{
bfd *abfd = unit->abfd;
unsigned int bytes_read;
struct dwarf_block *blk;
bfd_size_type amt;
attr->form = (enum dwarf_form) form;
switch (form)
{
case DW_FORM_addr:
/* FIXME: DWARF3 draft sais DW_FORM_ref_addr is offset_size. */
case DW_FORM_ref_addr:
DW_ADDR (attr) = read_address (unit, info_ptr);
info_ptr += unit->addr_size;
break;
case DW_FORM_block2:
amt = sizeof (struct dwarf_block);
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
blk->size = read_2_bytes (abfd, info_ptr);
info_ptr += 2;
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
info_ptr += blk->size;
DW_BLOCK (attr) = blk;
break;
case DW_FORM_block4:
amt = sizeof (struct dwarf_block);
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
blk->size = read_4_bytes (abfd, info_ptr);
info_ptr += 4;
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
info_ptr += blk->size;
DW_BLOCK (attr) = blk;
break;
case DW_FORM_data2:
DW_UNSND (attr) = read_2_bytes (abfd, info_ptr);
info_ptr += 2;
break;
case DW_FORM_data4:
DW_UNSND (attr) = read_4_bytes (abfd, info_ptr);
info_ptr += 4;
break;
case DW_FORM_data8:
DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
info_ptr += 8;
break;
case DW_FORM_string:
DW_STRING (attr) = read_string (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
break;
case DW_FORM_strp:
DW_STRING (attr) = read_indirect_string (unit, info_ptr, &bytes_read);
info_ptr += bytes_read;
break;
case DW_FORM_block:
amt = sizeof (struct dwarf_block);
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
blk->size = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
info_ptr += blk->size;
DW_BLOCK (attr) = blk;
break;
case DW_FORM_block1:
amt = sizeof (struct dwarf_block);
blk = (struct dwarf_block *) bfd_alloc (abfd, amt);
blk->size = read_1_byte (abfd, info_ptr);
info_ptr += 1;
blk->data = read_n_bytes (abfd, info_ptr, blk->size);
info_ptr += blk->size;
DW_BLOCK (attr) = blk;
break;
case DW_FORM_data1:
DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
info_ptr += 1;
break;
case DW_FORM_flag:
DW_UNSND (attr) = read_1_byte (abfd, info_ptr);
info_ptr += 1;
break;
case DW_FORM_sdata:
DW_SND (attr) = read_signed_leb128 (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
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_ref8:
DW_UNSND (attr) = read_8_bytes (abfd, info_ptr);
info_ptr += 8;
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_indirect:
form = read_unsigned_leb128 (abfd, info_ptr, &bytes_read);
info_ptr += bytes_read;
info_ptr = read_attribute_value (attr, form, unit, info_ptr);
break;
default:
(*_bfd_error_handler) (_("Dwarf Error: Invalid or unhandled FORM value: %u."),
form);
bfd_set_error (bfd_error_bad_value);
}
return info_ptr;
}
/* Read an attribute described by an abbreviated attribute. */
static char *
read_attribute (attr, abbrev, unit, info_ptr)
struct attribute *attr;
struct attr_abbrev *abbrev;
struct comp_unit *unit;
char *info_ptr;
{
attr->name = abbrev->name;
info_ptr = read_attribute_value (attr, abbrev->form, unit, info_ptr);
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;
int end_sequence; /* End of (sequential) code sequence. */
};
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; /* largest VMA */
struct line_info* lcl_head; /* local head; used in 'add_line_info' */
};
struct funcinfo
{
struct funcinfo *prev_func;
char* name;
bfd_vma low;
bfd_vma high;
};
/* add_line_info: adds a new entry to the line_info list in the
line_info_table, ensuring that the list is sorted. Note that the
line_info list is sorted from highest to lowest VMA (with possible
duplicates); that is, line_info->prev_line always accesses an equal
or smaller VMA. */
static void
add_line_info (table, address, filename, line, column, end_sequence)
struct line_info_table* table;
bfd_vma address;
char* filename;
unsigned int line;
unsigned int column;
int end_sequence;
{
bfd_size_type amt = sizeof (struct line_info);
struct line_info* info = (struct line_info*) bfd_alloc (table->abfd, amt);
/* Find the correct location for 'info'. Normally we will receive
new line_info data 1) in order and 2) with increasing VMAs.
However some compilers break the rules (cf. decode_line_info) and
so we include some heuristics for quickly finding the correct
location for 'info'. In particular, these heuristics optimize for
the common case in which the VMA sequence that we receive is a
list of locally sorted VMAs such as
p...z a...j (where a < j < p < z)
Note: table->lcl_head is used to head an *actual* or *possible*
sequence within the list (such as a...j) that is not directly
headed by table->last_line
Note: we may receive duplicate entries from 'decode_line_info'. */
while (1)
if (!table->last_line
|| address >= table->last_line->address)
{
/* Normal case: add 'info' to the beginning of the list */
info->prev_line = table->last_line;
table->last_line = info;
/* lcl_head: initialize to head a *possible* sequence at the end. */
if (!table->lcl_head)
table->lcl_head = info;
break;
}
else if (!table->lcl_head->prev_line
&& table->lcl_head->address > address)
{
/* Abnormal but easy: lcl_head is 1) at the *end* of the line
list and 2) the head of 'info'. */
info->prev_line = NULL;
table->lcl_head->prev_line = info;
break;
}
else if (table->lcl_head->prev_line
&& table->lcl_head->address > address
&& address >= table->lcl_head->prev_line->address)
{
/* Abnormal but easy: lcl_head is 1) in the *middle* of the line
list and 2) the head of 'info'. */
info->prev_line = table->lcl_head->prev_line;
table->lcl_head->prev_line = info;
break;
}
else
{
/* Abnormal and hard: Neither 'last_line' nor 'lcl_head' are valid
heads for 'info'. Reset 'lcl_head' and repeat. */
struct line_info* li2 = table->last_line; /* always non-NULL */
struct line_info* li1 = li2->prev_line;
while (li1)
{
if (li2->address > address && address >= li1->address)
break;
li2 = li1; /* always non-NULL */
li1 = li1->prev_line;
}
table->lcl_head = li2;
}
/* Set member data of 'info'. */
info->address = address;
info->filename = filename;
info->line = line;
info->column = column;
info->end_sequence = end_sequence;
}
static char *
concat_filename (table, file)
struct line_info_table* table;
unsigned int file;
{
char* filename;
if (file - 1 >= table->num_files)
{
(*_bfd_error_handler)
(_("Dwarf Error: mangled line number section (bad file number)."));
return "<unknown>";
}
filename = table->files[file - 1].name;
if (IS_ABSOLUTE_PATH(filename))
return filename;
else
{
char* dirname = (table->files[file - 1].dir
? table->dirs[table->files[file - 1].dir - 1]
: table->comp_dir);
/* Not all tools set DW_AT_comp_dir, so dirname may be unknown. The
best we can do is return the filename part. */
if (dirname == NULL)
return filename;
else
return (char*) concat (dirname, "/", filename, NULL);
}
}
static void
arange_add (unit, low_pc, high_pc)
struct comp_unit *unit;
bfd_vma low_pc;
bfd_vma high_pc;
{
struct arange *arange;
/* First see if we can cheaply extend an existing range. */
arange = &unit->arange;
do
{
if (low_pc == arange->high)
{
arange->high = high_pc;
return;
}
if (high_pc == arange->low)
{
arange->low = low_pc;
return;
}
arange = arange->next;
}
while (arange);
if (unit->arange.high == 0)
{
/* This is the first address range: store it in unit->arange. */
unit->arange.next = 0;
unit->arange.low = low_pc;
unit->arange.high = high_pc;
return;
}
/* Need to allocate a new arange and insert it into the arange list. */
arange = (struct arange *)
bfd_zalloc (unit->abfd, (bfd_size_type) sizeof (*arange));
arange->low = low_pc;
arange->high = high_pc;
arange->next = unit->arange.next;
unit->arange.next = arange;
}
/* Decode the line number information for UNIT. */
static struct line_info_table*
decode_line_info (unit, stash)
struct comp_unit *unit;
struct dwarf2_debug *stash;
{
bfd *abfd = unit->abfd;
struct line_info_table* table;
char *line_ptr;
char *line_end;
struct line_head lh;
unsigned int i, bytes_read, offset_size;
char *cur_file, *cur_dir;
unsigned char op_code, extended_op, adj_opcode;
bfd_size_type amt;
if (! stash->dwarf_line_buffer)
{
asection *msec;
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;
}
stash->dwarf_line_size = msec->_raw_size;
stash->dwarf_line_buffer = (char *) bfd_alloc (abfd, msec->_raw_size);
if (! stash->dwarf_line_buffer)
return 0;
if (! bfd_get_section_contents (abfd, msec, stash->dwarf_line_buffer,
(bfd_vma) 0, msec->_raw_size))
return 0;
/* FIXME: We ought to apply the relocs against this section before
we process it... */
}
/* Since we are using un-relocated data, it is possible to get a bad value
for the line_offset. Validate it here so that we won't get a segfault
below. */
if (unit->line_offset >= stash->dwarf_line_size)
{
(*_bfd_error_handler) (_("Dwarf Error: Line offset (%lu) greater than or equal to .debug_line size (%lu)."),
unit->line_offset, stash->dwarf_line_size);
bfd_set_error (bfd_error_bad_value);
return 0;
}
amt = sizeof (struct line_info_table);
table = (struct line_info_table*) bfd_alloc (abfd, amt);
table->abfd = abfd;
table->comp_dir = unit->comp_dir;
table->num_files = 0;
table->files = NULL;
table->num_dirs = 0;
table->dirs = NULL;
table->files = NULL;
table->last_line = NULL;
table->lcl_head = NULL;
line_ptr = stash->dwarf_line_buffer + unit->line_offset;
/* Read in the prologue. */
lh.total_length = read_4_bytes (abfd, line_ptr);
line_ptr += 4;
offset_size = 4;
if (lh.total_length == 0xffffffff)
{
lh.total_length = read_8_bytes (abfd, line_ptr);
line_ptr += 8;
offset_size = 8;
}
else if (lh.total_length == 0 && unit->addr_size == 8)
{
/* Handle (non-standard) 64-bit DWARF2 formats. */
lh.total_length = read_4_bytes (abfd, line_ptr);
line_ptr += 4;
offset_size = 8;
}
line_end = line_ptr + lh.total_length;
lh.version = read_2_bytes (abfd, line_ptr);
line_ptr += 2;
if (offset_size == 4)
lh.prologue_length = read_4_bytes (abfd, line_ptr);
else
lh.prologue_length = read_8_bytes (abfd, line_ptr);
line_ptr += offset_size;
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;
amt = lh.opcode_base * sizeof (unsigned char);
lh.standard_opcode_lengths = (unsigned char *) bfd_alloc (abfd, amt);
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)
{
amt = table->num_dirs + DIR_ALLOC_CHUNK;
amt *= sizeof (char *);
table->dirs = (char **) bfd_realloc (table->dirs, amt);
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)
{
amt = table->num_files + FILE_ALLOC_CHUNK;
amt *= sizeof (struct fileinfo);
table->files = (struct fileinfo *) bfd_realloc (table->files, amt);
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;
/* eraxxon@alumni.rice.edu: Against the DWARF2 specs, some
compilers generate address sequences that are wildly out of
order using DW_LNE_set_address (e.g. Intel C++ 6.0 compiler
for ia64-Linux). Thus, to determine the low and high
address, we must compare on every DW_LNS_copy, etc. */
bfd_vma low_pc = 0;
bfd_vma high_pc = 0;
/* Decode the table. */
while (! end_sequence)
{
op_code = read_1_byte (abfd, line_ptr);
line_ptr += 1;
if (op_code >= lh.opcode_base)
{
/* 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, 0);
basic_block = 1;
if (low_pc == 0 || address < low_pc)
low_pc = address;
if (address > high_pc)
high_pc = address;
}
else switch (op_code)
{
case DW_LNS_extended_op:
/* Ignore length. */
line_ptr += 1;
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,
end_sequence);
if (low_pc == 0 || address < low_pc)
low_pc = address;
if (address > high_pc)
high_pc = address;
arange_add (unit, low_pc, high_pc);
break;
case DW_LNE_set_address:
address = read_address (unit, line_ptr);
line_ptr += unit->addr_size;
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)
{
amt = table->num_files + FILE_ALLOC_CHUNK;
amt *= sizeof (struct fileinfo);
table->files =
(struct fileinfo *) bfd_realloc (table->files, amt);
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, 0);
basic_block = 0;
if (low_pc == 0 || address < low_pc)
low_pc = address;
if (address > high_pc)
high_pc = address;
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 += lh.minimum_instruction_length
* ((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:
{
int i;
/* Unknown standard opcode, ignore it. */
for (i = 0; i < lh.standard_opcode_lengths[op_code]; i++)
{
(void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
}
}
}
}
}
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, function, filename_ptr,
linenumber_ptr)
struct line_info_table* table;
bfd_vma addr;
struct funcinfo *function;
const char **filename_ptr;
unsigned int *linenumber_ptr;
{
/* Note: table->last_line should be a descendingly sorted list. */
struct line_info* next_line = table->last_line;
struct line_info* each_line = NULL;
*filename_ptr = NULL;
if (!next_line)
return false;
each_line = next_line->prev_line;
/* Check for large addresses */
if (addr > next_line->address)
each_line = NULL; /* ensure we skip over the normal case */
/* Normal case: search the list; save */
while (each_line && next_line)
{
/* If we have an address match, save this info. This allows us
to return as good as results as possible for strange debugging
info. */
boolean addr_match = false;
if (each_line->address <= addr && addr <= next_line->address)
{
addr_match = true;
/* If this line appears to span functions, and addr is in the
later function, return the first line of that function instead
of the last line of the earlier one. This check is for GCC
2.95, which emits the first line number for a function late. */
if (function != NULL
&& each_line->address < function->low
&& next_line->address > function->low)
{
*filename_ptr = next_line->filename;
*linenumber_ptr = next_line->line;
}
else
{
*filename_ptr = each_line->filename;
*linenumber_ptr = each_line->line;
}
}
if (addr_match && !each_line->end_sequence)
return true; /* we have definitely found what we want */
next_line = each_line;
each_line = each_line->prev_line;
}
/* At this point each_line is NULL but next_line is not. If we found
a candidate end-of-sequence point in the loop above, we can return
that (compatibility with a bug in the Intel compiler); otherwise,
assuming that we found the containing function for this address in
this compilation unit, return the first line we have a number for
(compatibility with GCC 2.95). */
if (*filename_ptr == NULL && function != NULL)
{
*filename_ptr = next_line->filename;
*linenumber_ptr = next_line->line;
return true;
}
return false;
}
/* Function table functions. */
/* If ADDR is within TABLE, set FUNCTIONNAME_PTR, and return true. */
static boolean
lookup_address_in_function_table (table, addr, function_ptr,
functionname_ptr)
struct funcinfo* table;
bfd_vma addr;
struct funcinfo** function_ptr;
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 && addr < each_func->high)
{
*functionname_ptr = each_func->name;
*function_ptr = each_func;
return true;
}
}
return false;
}
/* DWARF2 Compilation unit functions. */
/* 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 %u."),
abbrev_number);
bfd_set_error (bfd_error_bad_value);
return false;
}
if (abbrev->tag == DW_TAG_subprogram)
{
bfd_size_type amt = sizeof (struct funcinfo);
func = (struct funcinfo *) bfd_zalloc (abfd, amt);
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], unit, 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;
}
/* Look for a RELA relocation to be applied on OFFSET of section SEC,
and return the addend if such a relocation is found. Since this is
only used to find relocations referring to the .debug_abbrev
section, we make sure the relocation refers to this section, but
this is not strictly necessary, and it can probably be safely
removed if needed. However, it is important to note that this
function only returns the addend, it doesn't serve the purpose of
applying a generic relocation.
If no suitable relocation is found, or if it is not a real RELA
relocation, this function returns 0. */
static bfd_vma
find_rela_addend (abfd, sec, offset, syms)
bfd* abfd;
asection* sec;
bfd_size_type offset;
asymbol** syms;
{
long reloc_size = bfd_get_reloc_upper_bound (abfd, sec);
arelent **relocs = NULL;
long reloc_count, relc;
if (reloc_size <= 0)
return 0;
relocs = (arelent **) bfd_malloc ((bfd_size_type) reloc_size);
if (relocs == NULL)
return 0;
reloc_count = bfd_canonicalize_reloc (abfd, sec, relocs, syms);
if (reloc_count <= 0)
{
free (relocs);
return 0;
}
for (relc = 0; relc < reloc_count; relc++)
if (relocs[relc]->address == offset
&& (*relocs[relc]->sym_ptr_ptr)->flags & BSF_SECTION_SYM
&& strcmp ((*relocs[relc]->sym_ptr_ptr)->name,
".debug_abbrev") == 0)
{
bfd_vma addend = (relocs[relc]->howto->partial_inplace
? 0 : relocs[relc]->addend);
free (relocs);
return addend;
}
free (relocs);
return 0;
}
/* 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.
OFFSET_SIZE is the size of DWARF2 offsets (either 4 or 8 bytes).
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, stash, unit_length, offset_size)
bfd* abfd;
struct dwarf2_debug *stash;
bfd_vma unit_length;
unsigned int offset_size;
{
struct comp_unit* unit;
unsigned int version;
bfd_vma abbrev_offset = 0;
unsigned int addr_size;
struct abbrev_info** abbrevs;
unsigned int abbrev_number, bytes_read, i;
struct abbrev_info *abbrev;
struct attribute attr;
char *info_ptr = stash->info_ptr;
char *end_ptr = info_ptr + unit_length;
bfd_size_type amt;
bfd_size_type off;
version = read_2_bytes (abfd, info_ptr);
info_ptr += 2;
BFD_ASSERT (offset_size == 4 || offset_size == 8);
if (offset_size == 4)
abbrev_offset = read_4_bytes (abfd, info_ptr);
else
abbrev_offset = read_8_bytes (abfd, info_ptr);
/* The abbrev offset is generally a relocation pointing to
.debug_abbrev+offset. On RELA targets, we have to find the
relocation and extract the addend to obtain the actual
abbrev_offset, so do it here. */
off = info_ptr - stash->sec_info_ptr;
abbrev_offset += find_rela_addend (abfd, stash->sec, off, stash->syms);
info_ptr += offset_size;
addr_size = read_1_byte (abfd, info_ptr);
info_ptr += 1;
if (version != 2)
{
(*_bfd_error_handler) (_("Dwarf Error: found dwarf version '%u', this reader only handles version 2 information."), version);
bfd_set_error (bfd_error_bad_value);
return 0;
}
if (addr_size > sizeof (bfd_vma))
{
(*_bfd_error_handler) (_("Dwarf Error: found address size '%u', this reader can not handle sizes greater than '%u'."),
addr_size,
(unsigned int) sizeof (bfd_vma));
bfd_set_error (bfd_error_bad_value);
return 0;
}
if (addr_size != 2 && addr_size != 4 && addr_size != 8)
{
(*_bfd_error_handler) ("Dwarf Error: found address size '%u', this reader can only handle address sizes '2', '4' and '8'.", addr_size);
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, stash);
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: %u."),
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 %u."),
abbrev_number);
bfd_set_error (bfd_error_bad_value);
return 0;
}
amt = sizeof (struct comp_unit);
unit = (struct comp_unit*) bfd_zalloc (abfd, amt);
unit->abfd = abfd;
unit->addr_size = addr_size;
unit->offset_size = offset_size;
unit->abbrevs = abbrevs;
unit->end_ptr = end_ptr;
unit->stash = stash;
for (i = 0; i < abbrev->num_attrs; ++i)
{
info_ptr = read_attribute (&attr, &abbrev->attrs[i], unit, 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->arange.low = DW_ADDR (&attr);
break;
case DW_AT_high_pc:
unit->arange.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;
{
struct arange *arange;
if (unit->error)
return false;
arange = &unit->arange;
do
{
if (addr >= arange->low && addr < arange->high)
return true;
arange = arange->next;
}
while (arange);
return false;
}
/* 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, stash)
struct comp_unit* unit;
bfd_vma addr;
const char **filename_ptr;
const char **functionname_ptr;
unsigned int *linenumber_ptr;
struct dwarf2_debug *stash;
{
boolean line_p;
boolean func_p;
struct funcinfo *function;
if (unit->error)
return false;
if (! unit->line_table)
{
if (! unit->stmtlist)
{
unit->error = 1;
return false;
}
unit->line_table = decode_line_info (unit, stash);
if (! unit->line_table)
{
unit->error = 1;
return false;
}
if (unit->first_child_die_ptr < unit->end_ptr
&& ! scan_unit_for_functions (unit))
{
unit->error = 1;
return false;
}
}
function = NULL;
func_p = lookup_address_in_function_table (unit->function_table, addr,
&function, functionname_ptr);
line_p = lookup_address_in_line_info_table (unit->line_table, addr,
function, filename_ptr,
linenumber_ptr);
return (boolean) (line_p || func_p);
}
/* Locate a section in a BFD containing debugging info. The search starts
from the section after AFTER_SEC, or from the first section in the BFD if
AFTER_SEC is NULL. The search works by examining the names of the
sections. There are two permissiable names. The first is .debug_info.
This is the standard DWARF2 name. The second is a prefix .gnu.linkonce.wi.
This is a variation on the .debug_info section which has a checksum
describing the contents appended onto the name. This allows the linker to
identify and discard duplicate debugging sections for different
compilation units. */
#define DWARF2_DEBUG_INFO ".debug_info"
#define GNU_LINKONCE_INFO ".gnu.linkonce.wi."
static asection *
find_debug_info (abfd, after_sec)
bfd * abfd;
asection * after_sec;
{
asection * msec;
if (after_sec)
msec = after_sec->next;
else
msec = abfd->sections;
while (msec)
{
if (strcmp (msec->name, DWARF2_DEBUG_INFO) == 0)
return msec;
if (strncmp (msec->name, GNU_LINKONCE_INFO, strlen (GNU_LINKONCE_INFO)) == 0)
return msec;
msec = msec->next;
}
return NULL;
}
/* The DWARF2 version of find_nearest line. Return true if the line
is found without error. ADDR_SIZE is the number of bytes in the
initial .debug_info length field and in the abbreviation offset.
You may use zero to indicate that the default value should be
used. */
boolean
_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
filename_ptr, functionname_ptr,
linenumber_ptr, addr_size, pinfo)
bfd *abfd;
asection *section;
asymbol **symbols;
bfd_vma offset;
const char **filename_ptr;
const char **functionname_ptr;
unsigned int *linenumber_ptr;
unsigned int addr_size;
PTR *pinfo;
{
/* 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 = (struct dwarf2_debug *) *pinfo;
/* 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;
/* The DWARF2 spec says that the initial length field, and the
offset of the abbreviation table, should both be 4-byte values.
However, some compilers do things differently. */
if (addr_size == 0)
addr_size = 4;
BFD_ASSERT (addr_size == 4 || addr_size == 8);
if (! stash)
{
bfd_size_type total_size;
asection *msec;
bfd_size_type amt = sizeof (struct dwarf2_debug);
stash = (struct dwarf2_debug*) bfd_zalloc (abfd, amt);
if (! stash)
return false;
*pinfo = (PTR) stash;
msec = find_debug_info (abfd, NULL);
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;
/* There can be more than one DWARF2 info section in a BFD these days.
Read them all in and produce one large stash. We do this in two
passes - in the first pass we just accumulate the section sizes.
In the second pass we read in the section's contents. The allows
us to avoid reallocing the data as we add sections to the stash. */
for (total_size = 0; msec; msec = find_debug_info (abfd, msec))
total_size += msec->_raw_size;
stash->info_ptr = (char *) bfd_alloc (abfd, total_size);
if (stash->info_ptr == NULL)
return false;
stash->info_ptr_end = stash->info_ptr;
for (msec = find_debug_info (abfd, NULL);
msec;
msec = find_debug_info (abfd, msec))
{
bfd_size_type size;
bfd_size_type start;
size = msec->_raw_size;
if (size == 0)
continue;
start = stash->info_ptr_end - stash->info_ptr;
if (! bfd_get_section_contents (abfd, msec, stash->info_ptr + start,
(bfd_vma) 0, size))
continue;
stash->info_ptr_end = stash->info_ptr + start + size;
}
BFD_ASSERT (stash->info_ptr_end == stash->info_ptr + total_size);
stash->sec = find_debug_info (abfd, NULL);
stash->sec_info_ptr = stash->info_ptr;
stash->syms = symbols;
}
/* FIXME: There is a problem with the contents of the
.debug_info section. The 'low' and 'high' addresses of the
comp_units are computed by relocs against symbols in the
.text segment. We need these addresses in order to determine
the nearest line number, and so we have to resolve the
relocs. There is a similar problem when the .debug_line
section is processed as well (e.g., there may be relocs
against the operand of the DW_LNE_set_address operator).
Unfortunately getting hold of the reloc information is hard...
For now, this means that disassembling object files (as
opposed to fully executables) does not always work as well as
we would like. */
/* 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,
stash);
/* Read each remaining comp. units checking each as they are read. */
while (stash->info_ptr < stash->info_ptr_end)
{
bfd_vma length;
boolean found;
unsigned int offset_size = addr_size;
if (addr_size == 4)
{
length = read_4_bytes (abfd, stash->info_ptr);
if (length == 0xffffffff)
{
offset_size = 8;
length = read_8_bytes (abfd, stash->info_ptr + 4);
stash->info_ptr += 8;
}
else if (length == 0)
{
/* Handle (non-standard) 64-bit DWARF2 formats. */
offset_size = 8;
length = read_4_bytes (abfd, stash->info_ptr + 4);
stash->info_ptr += 4;
}
}
else
length = read_8_bytes (abfd, stash->info_ptr);
stash->info_ptr += addr_size;
if (length > 0)
{
each = parse_comp_unit (abfd, stash, length, offset_size);
stash->info_ptr += length;
if ((bfd_vma) (stash->info_ptr - stash->sec_info_ptr)
== stash->sec->_raw_size)
{
stash->sec = find_debug_info (abfd, stash->sec);
stash->sec_info_ptr = stash->info_ptr;
}
if (each)
{
each->next_unit = stash->all_comp_units;
stash->all_comp_units = each;
/* DW_AT_low_pc and DW_AT_high_pc are optional for
compilation units. If we don't have them (i.e.,
unit->high == 0), we need to consult the line info
table to see if a compilation unit contains the given
address. */
if (each->arange.high > 0)
{
if (comp_unit_contains_address (each, addr))
return comp_unit_find_nearest_line (each, addr,
filename_ptr,
functionname_ptr,
linenumber_ptr,
stash);
}
else
{
found = comp_unit_find_nearest_line (each, addr,
filename_ptr,
functionname_ptr,
linenumber_ptr,
stash);
if (found)
return true;
}
}
}
}
return false;
}
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